FN Thomson Reuters Web of Science™
VR 1.0
PT J
AU Su, WF
Matyjas, JD
Batalama, S
AF Su, Weifeng
Matyjas, John D.
Batalama, Stella
TI Active Cooperation Between Primary Users and Cognitive Radio Users in
Heterogeneous Ad-Hoc Networks
SO IEEE TRANSACTIONS ON SIGNAL PROCESSING
LA English
DT Article
DE Cooperative communications; amplify-and-forward relaying; cognitive
radio; heterogeneous ad-hoc networks
ID WIRELESS NETWORKS; PERFORMANCE ANALYSIS; POWER ALLOCATION; DIVERSITY;
RELAY; PROTOCOLS; CHANNELS; CAPACITY
AB In this paper, we consider a heterogeneous ad-hoc network where primary users may cooperate with cognitive radio (CR) users for the transmission of their data. We propose a new cooperation protocol that allows CR users to relay primary user signals in exchange for some spectrum. The spectrum released by primary users is used by CR users for their own data transmission. The proposed protocol maximizes the primary user power savings and the CR users' own data transmission rate. In addition, it provides more robust (potentially continuous) service for CR users, compared to the conventional practice in cognitive networks where cognitive users transmit in the spectrum holes of primary users (i.e., their service is interrupted when primary users need to transmit and no spectrum holes are available). More specifically, we propose a CR user power allocation scheme that maximizes the rate of transmission of CR user own data, for any given CR user power budget and a given bandwidth released from the primary user. Furthermore, we determine a range of possible transmission power levels that can be used by the primary user during cooperation without sacrificing its target transmission rate, and we derive a necessary condition on the quality of the channel between the primary user and the CR user that enables cooperation. Extensive numerical and simulation studies illustrate our theoretical developments and show that cooperation between a primary and CR user may lead, for example, to up to 80% savings of primary user power when compared to a noncooperation scheme at the same transmission power level.
C1 [Su, Weifeng; Batalama, Stella] SUNY Buffalo, Dept Elect Engn, Buffalo, NY 14260 USA.
[Matyjas, John D.] USAF, Res Lab, RIT, Rome, NY 13441 USA.
RP Su, WF (reprint author), SUNY Buffalo, Dept Elect Engn, Buffalo, NY 14260 USA.
EM weifeng@buffalo.edu; John.Matyjas@rl.af.mil; batalama@buffalo.edu
FU U.S. National Research Council (NRC); U.S. Air Force Research Laboratory
(AFRL) [FA87501110015, FA87501110016]
FX This work was supported in part by the U.S. National Research Council
(NRC) Research Fellowship Program and by the U.S. Air Force Research
Laboratory (AFRL) by Grants FA87501110015 and FA87501110016. Approved
for public release (reference number: 88ABW-2011-0329).
NR 26
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U1 2
U2 9
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1053-587X
EI 1941-0476
J9 IEEE T SIGNAL PROCES
JI IEEE Trans. Signal Process.
PD APR
PY 2012
VL 60
IS 4
BP 1796
EP 1805
DI 10.1109/TSP.2011.2181841
PG 10
WC Engineering, Electrical & Electronic
SC Engineering
GA 906OL
UT WOS:000301355500020
ER
PT J
AU Siegel, J
AF Siegel, Joe
TI Money Well Spent
SO COMMENTARY
LA English
DT Letter
C1 USAF, Fox Isl, WA USA.
RP Siegel, J (reprint author), USAF, Fox Isl, WA USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER JEWISH COMMITTEE
PI NEW YORK
PA 165 E 56TH ST, NEW YORK, NY 10022 USA
SN 0010-2601
J9 COMMENTARY
JI Commentary
PD APR
PY 2012
VL 133
IS 4
BP 9
EP 10
PG 2
WC Political Science; Social Issues
SC Government & Law; Social Issues
GA 910ZN
UT WOS:000301687200012
ER
PT J
AU Ferguson, B
Shilling, R
AF Ferguson, Bill
Shilling, Russell
TI Serious Games: Defense Advanced Research Projects Agency: An Interview
with Innovation Information Office Program Manager CAPT Russell
Shilling, PhD
SO GAMES FOR HEALTH JOURNAL
LA English
DT Editorial Material
C1 [Shilling, Russell] US Air Force Acad, Dept Behav Sci & Leadership, Colorado Springs, CO 80840 USA.
[Shilling, Russell] Naval Postgrad Sch, Dept Operat Res, Monterey, CA USA.
[Shilling, Russell] Naval Postgrad Sch, Dept Syst Engn, Monterey, CA USA.
NR 0
TC 0
Z9 0
U1 1
U2 1
PU MARY ANN LIEBERT, INC
PI NEW ROCHELLE
PA 140 HUGUENOT STREET, 3RD FL, NEW ROCHELLE, NY 10801 USA
SN 2161-783X
EI 2161-7856
J9 GAMES HEALTH J
JI Games Health J.
PD APR
PY 2012
VL 1
IS 2
BP 85
EP 86
DI 10.1089/g4h.2012.1305
PG 2
WC Health Policy & Services; Public, Environmental & Occupational Health;
Rehabilitation
SC Health Care Sciences & Services; Public, Environmental & Occupational
Health; Rehabilitation
GA V40YO
UT WOS:000209514100002
ER
PT J
AU Kao, GK
Sewell, EC
Jacobson, SH
Hall, SN
AF Kao, Gio K.
Sewell, Edward C.
Jacobson, Sheldon H.
Hall, Shane N.
TI New dominance rules and exploration strategies for the 1|r (i) |aU (i)
scheduling problem
SO COMPUTATIONAL OPTIMIZATION AND APPLICATIONS
LA English
DT Article
DE Branch and bound algorithms; Scheduling theory and algorithms; Dynamic
programming
ID SINGLE-MACHINE; LATE JOBS; WEIGHTED NUMBER; TARDINESS PROBLEM; TARDY
JOBS; ALGORITHM; MINIMIZE; BRANCH; CONSTRAINTS
AB The paper proposes a new exact approach, based on a Branch, Bound, and Remember (BB&R) algorithm that uses the Cyclic Best First Search (CBFS) strategy, for the 1|r (i) |aU (i) scheduling problem, a single machine scheduling problem, where the objective is to find a schedule with the minimum number of tardy jobs. The search space is reduced using new and improved dominance properties and tighter upper bounds, based on a new dynamic programming algorithm. Computational results establish the effectiveness of the BB&R algorithm with CBFS for a broad spectrum of problem instances. In particular, this algorithm was able to solve all problems instances, up to 300 jobs, while existing best known algorithms only solve problems instances up to 200 jobs. Furthermore, the BB&R algorithm with CBFS runs one to two orders of magnitude faster than the current best known algorithm on comparable instances.
C1 [Kao, Gio K.; Jacobson, Sheldon H.] Univ Illinois, Dept Comp Sci, Urbana, IL 61801 USA.
[Sewell, Edward C.] So Illinois Univ, Dept Math & Stat, Edwardsville, IL 62026 USA.
[Hall, Shane N.] USAF, Scott AFB, IL 62225 USA.
RP Jacobson, SH (reprint author), Univ Illinois, Dept Comp Sci, 201 N Goodwin Ave MC 258, Urbana, IL 61801 USA.
EM giokao@uiuc.edu; esewell@siue.edu; shj@illinois.edu;
shane.hall-03@scott.af.mil
FU Air Force Office of Scientific Research [FA9550-07-1-0232,
FA9550-10-1-0387]
FX The authors wish to thank the editor and three anonymous referees for
their insightful comments and suggestions, resulting in a significantly
improved manuscript. The computational results reported were obtained
using the Simulation and Optimization Laboratory. This research has been
supported in part by the Air Force Office of Scientific Research
(FA9550-07-1-0232, FA9550-10-1-0387). The views expressed in this paper
are those of the authors and do not reflect the official policy or
position of the United States Air Force, Department of Defense, or the
United States Government.
NR 31
TC 1
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U1 0
U2 2
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0926-6003
J9 COMPUT OPTIM APPL
JI Comput. Optim. Appl.
PD APR
PY 2012
VL 51
IS 3
BP 1253
EP 1274
DI 10.1007/s10589-010-9378-7
PG 22
WC Operations Research & Management Science; Mathematics, Applied
SC Operations Research & Management Science; Mathematics
GA 904GB
UT WOS:000301181200015
ER
PT J
AU Kumar, A
Voevoclin, AA
Zemlyanov, D
Zakharov, DN
Fisher, TS
AF Kumar, A.
Voevoclin, A. A.
Zemlyanov, D.
Zakharov, D. N.
Fisher, T. S.
TI Rapid synthesis of few-layer graphene over Cu foil
SO CARBON
LA English
DT Article
ID CHEMICAL-VAPOR-DEPOSITION; LARGE-AREA; RAMAN-SPECTROSCOPY; ENERGY
CALIBRATION; FILMS; GRAPHITE; GROWTH; COPPER; CATALYST
AB We report a unique process for rapid synthesis of few-layer graphene films on Cu foil by microwave plasma chemical vapor deposition (MPCVD). We show that the plasma/metal interaction can be advantageous for a rapid synthesis of such thin films. The process can produce films of controllable quality from amorphous to highly crystalline by adjusting plasma conditions during growth processes of similar to 100 s duration and with no supplemental substrate heating. Films have been characterized using Raman spectroscopy, scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy. The results help to identify the stages involved in the MPCVD deposition of thin carbon films on Cu foil, and the findings open new pathways for a rapid growth of few-layer graphene films. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Kumar, A.; Voevoclin, A. A.; Zemlyanov, D.; Zakharov, D. N.; Fisher, T. S.] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
[Voevoclin, A. A.; Fisher, T. S.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Fisher, TS (reprint author), Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
EM tsfisher@purdue.edu
RI Fisher, Timothy/D-8517-2011; Zakharov, Dmitri/F-4493-2014
OI Fisher, Timothy/0000-0002-8909-313X;
NR 39
TC 36
Z9 36
U1 4
U2 72
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0008-6223
J9 CARBON
JI Carbon
PD APR
PY 2012
VL 50
IS 4
BP 1546
EP 1553
DI 10.1016/j.carbon.2011.11.033
PG 8
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 901ZG
UT WOS:000301007800011
ER
PT J
AU McKeever, R
Sheppard, D
Nusslein, K
Baek, KH
Rieber, K
Ergas, SJ
Forbes, R
Hilyard, M
Park, C
AF McKeever, Robert
Sheppard, Diane
Nuesslein, Klaus
Baek, Kyung-Hwa
Rieber, Khalil
Ergas, Sarina J.
Forbes, Rose
Hilyard, Mark
Park, Chul
TI Biodegradation of ethylene dibromide (1,2-dibromoethane [EDB]) in
microcosms simulating in situ and biostimulated conditions
SO JOURNAL OF HAZARDOUS MATERIALS
LA English
DT Article
DE Biodegradation; Biostimulation; EDB; Microcosms; Natural attenuation
ID HYDROCARBONS; 1,2-DICHLOROETHANE; BACTERIA; SOILS
AB Although 1,2-dibromoethane (EDB) is a common groundwater contaminant, there is the lack of knowledge surrounding EDB biodegradation, especially under aerobic conditions. We have performed an extensive microcosm study to investigate the biodegradation of EDB under simulated in situ and biostimulated conditions. The materials for soil microcosms were collected from an EDB-contaminated aquifer at the Massachusetts Military Reservation in Cape Cod, MA. This EDB plume has persisted for nearly 40 years in both aerobic and anaerobic EDB zones of the aquifer. Microcosms were constructed under environmentally relevant conditions (field EDB and DO concentrations; incubated at 12 degrees C). The results showed that natural attenuation occurred under anaerobic conditions but not under aerobic conditions, explaining why aerobic EDB contamination is so persistent. EDB degradation rates were greater under biostimulated conditions for both the aerobic and anaerobic microcosms. Particularly for aerobic biostimulation, methane-amended microcosms degraded EDB, on average, at a first order rate eight times faster than unamended microcosms. The best performing replicate achieved an EDB degradation rate of 7.0 yr(-1) (half-life (t(1/2))=0.10 yr). Residual methane concentrations and the emergence of methanotrophic bacteria, measured by culture independent bacterial analysis, provided strong indications that EDB degradation in aerobic methane-amended microcosms occurred via cometabolic degradation. These results indicate the potential for enhanced natural attenuation of EDB and that methane could be considered co-substrate for EDB bioremediation for the EDB-contaminated groundwater in aerobic zone. (C) 2012 Elsevier B.V. All rights reserved.
C1 [McKeever, Robert; Sheppard, Diane; Park, Chul] Univ Massachusetts, Dept Civil & Environm Engn, Amherst, MA 01003 USA.
[Nuesslein, Klaus; Baek, Kyung-Hwa; Rieber, Khalil] Univ Massachusetts, Dept Microbiol, Amherst, MA 01003 USA.
[Ergas, Sarina J.] Univ S Florida, Dept Civil & Environm Engn, Tampa, FL 33620 USA.
[Forbes, Rose] USAF, Ctr Engn & Environm, Otis Air Natl Guard Base, MA 02542 USA.
[Hilyard, Mark] CH2M Hill Massachusetts Mil Reservat, Otis Air Natl Guard Base, MA 02542 USA.
RP Park, C (reprint author), Univ Massachusetts, Dept Civil & Environm Engn, 16A Marston, Amherst, MA 01003 USA.
EM park@ecs.umass.edu
RI Ergas, Sarina/B-5489-2013
FU Air Force Center for Engineering and the Environment (AFCEE)
FX This research was funded by The Air Force Center for Engineering and the
Environment (AFCEE). We thank AFCEE/CH2M HILL for providing us with soil
core and groundwater samples.
NR 29
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U1 1
U2 23
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0304-3894
J9 J HAZARD MATER
JI J. Hazard. Mater.
PD MAR 30
PY 2012
VL 209
BP 92
EP 98
DI 10.1016/j.jhazmat.2011.12.067
PG 7
WC Engineering, Environmental; Engineering, Civil; Environmental Sciences
SC Engineering; Environmental Sciences & Ecology
GA 913NM
UT WOS:000301884700012
PM 22301079
ER
PT J
AU Sinha, V
Srinivasan, R
Tamirisakandala, S
Miracle, DB
AF Sinha, V.
Srinivasan, R.
Tamirisakandala, S.
Miracle, D. B.
TI Superplastic behavior of Ti-6Al-4V-0.1B alloy
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Titanium alloy; Superplasticity; Strain rate sensitivity
ID LOW-TEMPERATURE SUPERPLASTICITY; TIC)/TI MATRIX COMPOSITE;
TITANIUM-ALLOYS; DEFORMATION; (TIB; DIFFUSION; SHEET
AB The superplastic behavior of Ti-6Al-4V-0.1B sheet was evaluated. The strain rate sensitivity (m) is >= 0.47 in the temperature range 775-900 degrees C and at strain rate, (epsilon) over dot = 10(-5) to 10(-3) s(-1). The material exhibits tensile elongations > 200% in the temperature range 725-950 degrees C at (epsilon) over dot = 3 x 10(-4) s(-1). The optimum superplastic forming temperature is 900 degrees C, which is similar to conventional Ti-6Al-4V. However, a lower flow stress is needed in the case of Ti-6Al-4V-0.1 B. The superplastic deformation mechanism is suggested from estimates of activation energy to be grain boundary sliding (CBS) accommodated by dislocation motion along grain boundaries at (epsilon) over dot = 10(-4) s(-1) and is diffusion-controlled dislocation climb at (epsilon) over dot = 10(-3) s(-1). Microstructural observations also confirm that CBS is the operating deformation mechanism at 900 degrees C and (epsilon) over dot = 3 x 10(-4) s(-1). (C) 2011 Elsevier B.V. All rights reserved.
C1 [Sinha, V.] UES Inc, Dayton, OH 45432 USA.
[Sinha, V.; Tamirisakandala, S.; Miracle, D. B.] USAF, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Srinivasan, R.] Wright State Univ, Mech & Mat Engn Dept, Dayton, OH 45435 USA.
[Tamirisakandala, S.] FMW Composite Syst Inc, Bridgeport, WV 26330 USA.
RP Sinha, V (reprint author), UES Inc, 4401 Dayton Xenia Rd, Dayton, OH 45432 USA.
EM vikas.sinha@wpafb.af.mil
FU Air Force Research Laboratory, Materials and Manufacturing Directorate
[FA9650-04-D-5233, FA8650-10-D-5226]; EMTEC [CT-86]
FX This research was supported by Air Force Research Laboratory, Materials
and Manufacturing Directorate (Contract # FA9650-04-D-5233 and
FA8650-10-D-5226). The authors thank Mike Scott (UES, Inc.) for help
with running the high temperature tension tests. The Ti-6Al-4V-0.1B
sheets used in this study were fabricated in collaboration with Scott
Reed (Flowserve) and Oscar Yu (RTI) under EMTEC Project CT-86.
NR 26
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U1 2
U2 26
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD MAR 30
PY 2012
VL 539
BP 7
EP 12
DI 10.1016/j.msea.2011.12.058
PG 6
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 915SI
UT WOS:000302047300002
ER
PT J
AU Burke, WJ
Gentile, LC
Shomo, SR
Roddy, PA
Pfaff, RF
AF Burke, William J.
Gentile, Louise C.
Shomo, Shannon R.
Roddy, Patrick A.
Pfaff, Robert F.
TI Images of bottomside irregularities observed at topside altitudes
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID EQUATORIAL PLASMA BUBBLES; F-REGION; SPREAD-F; ELECTRIC-FIELD;
IONOSPHERE; SCINTILLATION; CLIMATOLOGY
AB We analyzed plasma and field measurements acquired by the Communication/Navigation Outage Forecasting System (C/NOFS) satellite during an eight-hour period on 13-14 January 2010 when strong to moderate 250 MHz scintillation activity was observed at nearby Scintillation Network Decision Aid (SCINDA) ground stations. C/NOFS consistently detected relatively small-scale density and electric field irregularities embedded within large-scale (similar to 100 km) structures at topside altitudes. Significant spectral power measured at the Fresnel (similar to 1 km) scale size suggests that C/NOFS was magnetically conjugate to bottomside irregularities similar to those directly responsible for the observed scintillations. Simultaneous ion drift and plasma density measurements indicate three distinct types of large-scale irregularities: (1) upward moving depletions, (2) downward moving depletions, and (3) upward moving density enhancements. The first type has the characteristics of equatorial plasma bubbles; the second and third do not. The data suggest that both downward moving depletions and upward moving density enhancements and the embedded small-scale irregularities may be regarded as Alfvenic images of bottomside irregularities. This interpretation is consistent with predictions of previously reported theoretical modeling and with satellite observations of upward-directed Poynting flux in the low-latitude ionosphere.
C1 [Burke, William J.; Gentile, Louise C.; Shomo, Shannon R.; Roddy, Patrick A.] Space Vehicles Directorate, AF Res Lab, Hanscom AFB, MA 01731 USA.
[Burke, William J.] Boston Coll, Inst Sci Res, Chestnut Hill, MA 02167 USA.
[Pfaff, Robert F.] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
RP Burke, WJ (reprint author), Space Vehicles Directorate, AF Res Lab, 29 Randolph Rd, Hanscom AFB, MA 01731 USA.
EM afrl.rvborgmailbox@kirtland.af.mil
RI Pfaff, Robert/F-5703-2012
OI Pfaff, Robert/0000-0002-4881-9715
FU Air Force Office of Scientific Research; Task [12RV10COR]; Boston
College; [FA8718-08-C-0012]
FX Support for the present work was provided by the Air Force Office of
Scientific Research, Task 12RV10COR, and AF contract FA8718-08-C-0012
with Boston College. The authors are very grateful to R.A. Heelis for
helpful discussions about the possible roles of Alfven waves in the
development of the Rayleigh-Taylor instability.
NR 34
TC 2
Z9 2
U1 0
U2 4
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-9380
EI 2169-9402
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR 29
PY 2012
VL 117
AR A03332
DI 10.1029/2011JA017169
PG 13
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 918LZ
UT WOS:000302252500001
ER
PT J
AU Blank, L
Weeks, DE
Kedziora, GS
AF Blank, L.
Weeks, David E.
Kedziora, Gary S.
TI M plus Ng potential energy curves including spin-orbit coupling for M =
K, Rb, Cs and Ng = He, Ne, Ar
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
ID UNITARY-GROUP APPROACH; TRANSMISSION SPECTRA; ELECTRONIC-STRUCTURE;
EXCITED-STATES; PROGRAM SYSTEM; BROWN DWARFS; VAPOR LASER; T-DWARFS;
LINES; COLLISIONS
AB The X-2 Sigma(+)(1/2), A(2)Pi(1/2), A(2)Pi(3/2), and B-2 Sigma(+)(1/2) potential energy curves and associated dipole matrix elements are computed for M + Ng at the spin-orbit multi-reference configuration interaction level, where M = K, Rb, Cs and Ng = He, Ne, Ar. Dissociation energies and equilibrium positions for all minima are identified and corresponding vibrational energy levels are computed. Difference potentials are used together with the quasistatic approximation to estimate the position of satellite peaks of collisionally broadened D2 lines. The comparison of potential energy curves for different alkali atom and noble gas atom combinations is facilitated by using the same level of theory for all nine M + Ng pairs.[http://dx.doi.org/10.1063/1.3696377]
C1 [Blank, L.; Weeks, David E.] USAF, Dept Engn Phys, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Kedziora, Gary S.] Dynam Res Corp, Wright Patterson AFB, OH 45433 USA.
RP Blank, L (reprint author), USAF, Dept Engn Phys, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM david.weeks@afit.edu
FU Air Force Office of Scientific Research; High Energy Laser Joint
Technology Office; Department of Defense; AFRL DSRC
FX The authors are grateful to M. C. Heaven for several useful discussions
regarding potential energy curves and line broadening models. We
gratefully acknowledge support for this work from the Air Force Office
of Scientific Research and the High Energy Laser Joint Technology
Office. We would also like to acknowledge the Department of Defense High
Performance Computer Modernization Program and the AFRL DSRC for
computer time and support.
NR 64
TC 10
Z9 10
U1 2
U2 21
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2012
VL 136
IS 12
AR 124315
DI 10.1063/1.3696377
PG 9
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 917YU
UT WOS:000302216200041
PM 22462865
ER
PT J
AU Shuman, NS
Miller, TM
Viggiano, AA
AF Shuman, Nicholas S.
Miller, Thomas M.
Viggiano, A. A.
TI Kinetics of electron attachment to OH and HNO3 and mutual neutralization
of Ar+ with NO2- and NO3- at 300 and 500 K
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
ID FLOWING-AFTERGLOW PLASMAS; PHASE ION CHEMISTRY; TEMPERATURE-DEPENDENCE;
RATE COEFFICIENTS; MOLECULES; ENERGY; CAPTURE; SF6
AB The electron attachment rate constant to nitric acid (HNO3) has been measured in a flowing afterglow-Langmuir probe (FALP) apparatus at 300 and 500 K using three independent methods: the traditional FALP technique of monitoring electron depletion, "one-gas" VENDAMS (variable electron and neutral density attachment mass spectrometry), and "two-gas" VENDAMS. The three measurements are in agreement with a 300 K weighted average of 1.4 +/- 0.3 x 10(-7) cm(3) s(-1), 2 to 10 times higher than previously reported values. Attachment is primarily dissociative yielding NO2- as previously reported, but for the first time a small endothermic channel to produce OH- was also observed at 500 K. From the one-gas VENDAMS data, associative attachment to the OH produced in the primary attachment was found to occur with an effective two body rate constant of 1.2 +/-(3)(0.7) x 10(-11) cm(3) s(-1) at 300 K, the first reported rate constant for this radical species. Finally, ion-ion neutralization rate constants of NO2- and NO3- with Ar+ were determined to be 5.2 +/-(1.5)(2.5) x 10(-8) and 4.5 +/- 2.5 x 10(-8) cm(3) s(-1) at 300 K, respectively. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3694876]
C1 [Shuman, Nicholas S.; Miller, Thomas M.; Viggiano, A. A.] USAF, Res Lab, Space Vehicles Directorate, Albuquerque, NM 87117 USA.
RP Shuman, NS (reprint author), USAF, Res Lab, Space Vehicles Directorate, Albuquerque, NM 87117 USA.
FU Air Force Office of Scientific Research through AFOSR [2303EP];
Institute for Scientific Research of Boston College [FA8718-10-C-0002]
FX This project was supported by the Air Force Office of Scientific
Research through AFOSR (Contract No. 2303EP). T.M.M. is under contract
(FA8718-10-C-0002) from the Institute for Scientific Research of Boston
College.
NR 45
TC 10
Z9 10
U1 0
U2 10
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-9606
EI 1089-7690
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2012
VL 136
IS 12
AR 124307
DI 10.1063/1.3694876
PG 7
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 917YU
UT WOS:000302216200033
PM 22462857
ER
PT J
AU Troe, J
Miller, TM
Viggiano, AA
AF Troe, Juergen
Miller, Thomas M.
Viggiano, Albert A.
TI Communication: Revised electron affinity of SF6 from kinetic data
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
DE dissociation energies; electron affinity; electron attachment; negative
ions; reaction kinetics theory; reaction rate constants; sulphur
compounds; vibrational states
AB Previously determined experimental data for thermal attachment of electrons to SF6 and thermal detachment from SF6- over the range 590-670 K are reevaluated by a third-law analysis. Recent high precision calculations of SF6- harmonic frequences and anharmonicities (for several of the modes) lead to considerable changes in modeled vibrational partition functions which then have to be accommodated for by a smaller value of the derived adiabatic electron affinity EA of SF6. The previously estimated value of EA = 1.20 (+/- 0.05) eV in this way is reduced to a value of EA = 1.03 (+/- 0.05) eV. In addition, the bond dissociation energy E-0,E-dis for SF6 -> SF5 + F is reduced to E-0,E-dis = 1.44 (+/- 0.05) eV. Finally, the consequences for modeled specific rate constants k(det)(E,J) of electron detachment from SF6- are discussed. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698170]
C1 [Troe, Juergen] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany.
[Troe, Juergen] Max Planck Inst Biophys Chem, D-37077 Gottingen, Germany.
[Miller, Thomas M.; Viggiano, Albert A.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Troe, J (reprint author), Univ Gottingen, Inst Phys Chem, Tammannstr 6, D-37077 Gottingen, Germany.
EM shoff@gwdg.de
FU EOARD [FA8655-11-1-3077]
FX The most helpful discussions of this work with W. Eisfeld, who also
provided us updated rotational constants of SF6-
as well as extended calculations of anharmonic energy levels, are
gratefully acknowledged. We also thank K. Morokuma for sharing his new
results3 with us. The work was supported by the EOARD Grant
Award FA8655-11-1-3077.
NR 14
TC 13
Z9 13
U1 1
U2 24
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 28
PY 2012
VL 136
IS 12
AR 121102
DI 10.1063/1.3698170
PG 3
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 917YU
UT WOS:000302216200002
PM 22462826
ER
PT J
AU Koerner, H
MacCuspie, RI
Park, K
Vaia, RA
AF Koerner, Hilmar
MacCuspie, Robert I.
Park, Kyoungweon
Vaia, Richard A.
TI In Situ UV/Vis, SAXS, and TEM Study of Single-Phase Gold Nanoparticle
Growth
SO CHEMISTRY OF MATERIALS
LA English
DT Article
DE gold nanoparticle; small angle X-ray scattering; transmission electron
microscopy; nanoparticle growth; kinetics
ID X-RAY-SCATTERING; PARTICLE-SIZE; KINETICS; PEPTIDE; TEMPLATES; NANORODS;
NUCLEATION; MOLECULES; PHOTOREDUCTION; NANOCRYSTALS
AB Given the diverse scientific and technological applications of gold nanoparticles (Au NPs), understanding the impact of macromolecular additives on the distribution of size, shape, and composition is crucial to ensure reproducibility and lower production cost. In situ measurement of the evolution of these distributions challenges current techniques; however, it is critical for in-line manufacturing controls. Using mild Au(I) reduction by tert-butylamine-borane in toluene, the utility and limitations of SAXS, UV/Vis spectroscopy, and TEM are considered by comparing the mean nanoparticle size, size distribution, and relative number density. Individually, these techniques are insufficient to follow these parameters through the initial process of nucleation and growth; either providing insufficient information on the number of particles (UV/Vis), introducing artifacts (TEM), or not providing a unique solution for the shape of the distribution (SAXS). However, when used in conjunction, especially SAXS calibrated with TEM of reaction aliquots, the time evolution of these parameters can be quantified. For the single-phase Au NP synthesis with Au(I) and mild reductants, four distinct experimental regions are revealed that entail two growth mechanisms, which complement previous discussions of single-mode growth kinetics. The kinetics of Au(I):borane reactions are dependent on the Au precursor/reductant ratio and the thiol capping agent length, when reductant concentration is low. The final reaction products exhibit an LSW size distribution.
C1 [Koerner, Hilmar; MacCuspie, Robert I.; Park, Kyoungweon; Vaia, Richard A.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Koerner, Hilmar; Park, Kyoungweon] UES, Dayton, OH 45432 USA.
RP Vaia, RA (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM Richard.vaia@wpafb.af.mil
OI MacCuspie, Robert/0000-0002-6618-6499
FU Materials and Manufacturing Directorate; Air Force Office of Scientific
Research
FX We would like to thank the following people for their help: Dr.
Alexander Hexemer and Dr. Eric Schaible, for guidance, setup, and data
collection at beamline 7.3.3 at ALS/LBNL (as well as Lixia Rong at
beamline X27C of NSLS/BNL). We also thank Jan Ilavsky for providing and
refining the Nika data reduction routine. Sanat Kumar and Michael Clark
of Columbia University are acknowledged for extremely fruitful
discussions on growth kinetics. This work was completed at Air Force
Research Laboratory (AFRL) at Wright Patterson Air Force Base with
funding from Materials and Manufacturing Directorate, as well as Air
Force Office of Scientific Research. Finally, we would like to thank the
reviewers for their valuable comments.
NR 64
TC 17
Z9 17
U1 14
U2 131
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0897-4756
EI 1520-5002
J9 CHEM MATER
JI Chem. Mat.
PD MAR 27
PY 2012
VL 24
IS 6
BP 981
EP 995
DI 10.1021/cm202633v
PG 15
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 914JX
UT WOS:000301947000006
ER
PT J
AU Park, J
Mitchel, WC
Elhamri, S
Back, TC
AF Park, Jeongho
Mitchel, W. C.
Elhamri, Said
Back, Tyson C.
TI Effect of in-situ oxygen on the electronic properties of graphene grown
by carbon molecular beam epitaxy grown
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID OXIDE; SUBSTRATE; FILMS; SIO2
AB We report that graphene grown by molecular beam epitaxy from solid carbon (CMBE) on (0001) SiC in the presence of unintentional oxygen exhibits a small bandgap on the order of tens of meV. The presence of bandgaps is confirmed by temperature dependent Hall effect and resistivity measurements. X-ray photoelectron spectroscopy (XPS) measurements suggest that oxygen incorporates into the SiC substrate in the form of O-Si-C and not into the graphene as graphene oxide or some other species. The effect is independent of the carrier type of the graphene. Temperature dependent transport measurements show the presence of hopping conduction in the resistivity and a concurrent disappearance of the Hall voltage. Interactions between the graphene layers and the oxidized substrate are believed to be responsible for the bandgap. VC 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3697830]
C1 [Park, Jeongho; Mitchel, W. C.; Back, Tyson C.] USAF, Res Lab, Mat & Mfg Directorate AFRL RXPS, Wright Patterson AFB, OH 45433 USA.
[Elhamri, Said] Univ Dayton, Dept Phys, Dayton, OH 45469 USA.
RP Park, J (reprint author), USAF, Res Lab, Mat & Mfg Directorate AFRL RXPS, Wright Patterson AFB, OH 45433 USA.
EM jeongho.park@wpafb.af.mil
FU Air Force Office of Scientific Research
FX This work was supported by the Air Force Office of Scientific Research
(Dr. Harold Weinstock). We thank M. G. Landis for technical assistance.
NR 23
TC 3
Z9 3
U1 3
U2 24
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 26
PY 2012
VL 100
IS 13
AR 133107
DI 10.1063/1.3697830
PG 4
WC Physics, Applied
SC Physics
GA 918DZ
UT WOS:000302230800065
ER
PT J
AU Ward, B
AF Ward, Benjamin
TI Bend performance-enhanced photonic crystal fibers with anisotropic
numerical aperture (vol 16, pg 8532, 2008)
SO OPTICS EXPRESS
LA English
DT Correction
AB An error was made in converting the units of bend radius within the computer program used to obtain the reported results. This caused the calculated values of the bending induced stress to be significantly smaller than their true value. Corrected results for stress within the fiber and bend losses are reported. Since bending-induced stresses cause a relatively small correction to the refractive index profile, these corrections result in no changes in the main conclusions of this work. (C) 2012 Optical Society of America
C1 USAF Acad, Laser & Opt Res Ctr, Dept Phys, Colorado Springs, CO 80840 USA.
RP Ward, B (reprint author), USAF Acad, Laser & Opt Res Ctr, Dept Phys, Suite 2A31,2354 Fairchild Dr, Colorado Springs, CO 80840 USA.
EM benjamin.ward.1@us.af.mil
NR 3
TC 0
Z9 0
U1 0
U2 5
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD MAR 26
PY 2012
VL 20
IS 7
BP 7966
EP 7972
DI 10.1364/OE.20.007966
PG 7
WC Optics
SC Optics
GA 916YJ
UT WOS:000302138800108
ER
PT J
AU Firth, J
Black, J
AF Firth, Jordan
Black, Jonathan
TI Vibration interaction in a multiple flywheel system
SO JOURNAL OF SOUND AND VIBRATION
LA English
DT Article
AB This paper investigates vibration interaction in a multiple flywheel system. Flywheels can be used for kinetic energy storage in a satellite Integrated Power and Attitude Control System (IPACS). One hitherto unstudied problem with IPACS is vibration interaction between multiple unbalanced wheels. This paper uses a linear state-space dynamics model to study the impact of vibration interaction. Specifically, imbalance-induced vibration inputs in one flywheel rotor are used to cause a resonant whirling vibration in another rotor. Extra-synchronous resonant vibrations are shown to exist, but with damping modeled the effect is minimal. Vibration is most severe when both rotors are spinning in the same direction. Published by Elsevier Ltd.
C1 [Firth, Jordan; Black, Jonathan] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Black, J (reprint author), USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM jordan.firth@us.af.mil; jonathan.black@afit.edu
RI Black, Jonathan/R-4875-2016
OI Black, Jonathan/0000-0001-9315-3994
FU NASA Glenn Research Center
FX The authors would like to thank Ray Beach and the other members of the
flywheel team at NASA Glenn Research Center for their support.
NR 14
TC 5
Z9 6
U1 0
U2 9
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0022-460X
J9 J SOUND VIB
JI J. Sound Vibr.
PD MAR 26
PY 2012
VL 331
IS 7
BP 1701
EP 1714
DI 10.1016/j.jsv.2011.11.028
PG 14
WC Acoustics; Engineering, Mechanical; Mechanics
SC Acoustics; Engineering; Mechanics
GA 892BY
UT WOS:000300262900016
ER
PT J
AU Ali, SF
Hussain, SM
Schlager, JJ
Trickler, WJ
AF Ali, Syed F.
Hussain, Saber M.
Schlager, John J.
Trickler, William J.
TI Engineered metallic nanoparticles and blood-brain-barrier
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Ali, Syed F.] US FDA, Div Neurotoxicol, Natl Ctr Toxicol Res, Jefferson, AR 72079 USA.
[Hussain, Saber M.; Schlager, John J.; Trickler, William J.] US Air Force Res Lab, Appl Biotechnol Branch, HED AFRL, Dayton, OH 45433 USA.
EM Syed.ali@fda.hhs.gov
NR 0
TC 0
Z9 0
U1 0
U2 5
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 185-ENVR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475104969
ER
PT J
AU Chushak, Y
Martin, JA
Hagen, J
Chavez, JL
Kelley-Loughnane, N
Stone, MO
AF Chushak, Yaroslav
Martin, Jennifer A.
Hagen, Joshua
Chavez, Jorge L.
Kelley-Loughnane, Nancy
Stone, Morley O.
TI Combination of in silico design and microarray screening for
high-throughput selection of protein binding peptides
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Chushak, Yaroslav; Martin, Jennifer A.; Hagen, Joshua; Chavez, Jorge L.; Kelley-Loughnane, Nancy; Stone, Morley O.] Air Force Res Lab, Human Effectiveness Directorate, Wright Patterson AFB, OH 45433 USA.
EM yaroslav.chushak@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 278-COMP
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475104463
ER
PT J
AU Cole, C
Knoerzer, T
AF Cole, Caleb
Knoerzer, Timm
TI Synthesis of orthogonal chain-growth polymers from novel tripodal
monomeric structures
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Cole, Caleb; Knoerzer, Timm] USAF Acad, Colorado Springs, CO 80840 USA.
EM C12Caleb.Cole@usafa.edu
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 1372-CHED
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475103053
ER
PT J
AU Danielson, S
Ball, DW
Kettwich, SC
Iacono, ST
AF Danielson, Seth
Ball, David W.
Kettwich, Sharon C.
Iacono, Scott T.
TI Design of fluoropolymer metal composites for energetic materials
development
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Danielson, Seth; Ball, David W.; Kettwich, Sharon C.; Iacono, Scott T.] USAF Acad, Dept Chem, Colorado Springs, CO 80840 USA.
EM c12seth.danielson@usafa.edu
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 1367-CHED
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475103048
ER
PT J
AU Eby, DM
Strack, GM
Nadeau, LJ
Tatum, RN
Luckarift, HR
Pachter, R
Johnson, GR
AF Eby, D. Matthew
Strack, Guinevere M.
Nadeau, Lloyd J.
Tatum, Randi N.
Luckarift, Heather R.
Pachter, Ruth
Johnson, Glenn R.
TI Structure-function characterization and redox tuning of a multicopper
oxidase for biological fuel cell cathodes
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Eby, D. Matthew; Tatum, Randi N.; Luckarift, Heather R.] Universal Technol Corp, Tyndall AFB, FL 32403 USA.
[Strack, Guinevere M.; Nadeau, Lloyd J.; Johnson, Glenn R.] Air Force Res Lab, Mat & Mfg Directorate, Tyndall AFB, FL 32403 USA.
[Pachter, Ruth] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM matt.eby.ctr@tyndall.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 15-BIOT
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475100556
ER
PT J
AU Emami, FS
Berry, RJ
Naik, RR
Perry, CC
Patwardhan, SV
Heinz, H
AF Emami, Fateme S.
Berry, Rajiv J.
Naik, Rajesh R.
Perry, Carole C.
Patwardhan, Siddharth V.
Heinz, Hendrik
TI Atomistic simulation of aqueous silica interfaces
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 243rd National Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc
C1 [Emami, Fateme S.; Heinz, Hendrik] Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA.
[Berry, Rajiv J.; Naik, Rajesh R.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Perry, Carole C.] Nottingham Trent Univ, Interdisciplinary Biomed Res Ctr, Nottingham, England.
[Patwardhan, Siddharth V.] Univ Strathclyde, Dept Chem & Proc Engn, Glasgow, Lanark, Scotland.
EM fe2@zips.uakron.edu
RI Patwardhan, Siddharth/B-5037-2009; Heinz, Hendrik/E-3866-2010
OI Patwardhan, Siddharth/0000-0002-4958-8840; Heinz,
Hendrik/0000-0002-6776-7404
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 118-PMSE
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219JX
UT WOS:000324503203823
ER
PT J
AU Farmer, BL
AF Farmer, Barry L.
TI Polymer research for the Air Force: Interests and opportunities
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 243rd National Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc
C1 [Farmer, Barry L.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
EM barry.farmer@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 439-POLY
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219JX
UT WOS:000324503204677
ER
PT J
AU Farmer, BL
Roy, A
Brown, J
Lee, J
Varshney, V
AF Farmer, Barry L.
Roy, Ajit
Brown, Joshua
Lee, Jonghoon (Jay)
Varshney, Vikas
TI Modeling thermal transport in polymer nanocomposites
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 243rd National Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc
C1 [Farmer, Barry L.; Roy, Ajit] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
[Brown, Joshua; Lee, Jonghoon (Jay); Varshney, Vikas] Universal Technol Corp, Dayton, OH 45432 USA.
EM barry.farmer@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 1
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 143-PMSE
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219JX
UT WOS:000324503203848
ER
PT J
AU Fillery, S
Kern, K
Koerner, H
Drummy, L
Tchoul, M
Beier, C
Brutchey, RL
Durstock, MF
Vaia, RA
AF Fillery, Scott
Kern, Kimberly
Koerner, Hilmar
Drummy, Lawrence
Tchoul, Maxim
Beier, Christopher
Brutchey, Richard L.
Durstock, Michael F.
Vaia, Richard A.
TI Single component BaTiO3 polymer nanocomposites: Polymer-nanoparticle
hybrids for capacitive energy storage
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 243rd National Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc
C1 [Fillery, Scott; Kern, Kimberly; Koerner, Hilmar; Drummy, Lawrence; Durstock, Michael F.; Vaia, Richard A.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Tchoul, Maxim] Osram Sylvania Corp, Beverly, MA USA.
[Beier, Christopher; Brutchey, Richard L.] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA.
EM richard.vaia@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 4
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 229-PMSE
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219JX
UT WOS:000324503203933
ER
PT J
AU Heinz, H
Fu, YT
Zartman, GD
Liu, H
Drummy, LF
AF Heinz, Hendrik
Fu, Yao-Tsung
Zartman, Gregory D.
Liu, Hua
Drummy, Lawrence F.
TI Nanomechanics and dispersion of layered silicates in polymer matrices:
Moduli, cleavage energy, and free energy of exfoliation
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 243rd National Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc
C1 [Heinz, Hendrik; Fu, Yao-Tsung; Zartman, Gregory D.; Liu, Hua] Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA.
[Drummy, Lawrence F.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM hendrik.heinz@uakron.edu
RI Heinz, Hendrik/E-3866-2010
OI Heinz, Hendrik/0000-0002-6776-7404
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 1172-INOR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219JX
UT WOS:000324503201528
ER
PT J
AU Heinz, H
Fu, YT
Zartman, GD
Yoonessi, M
Drummy, LF
AF Heinz, Hendrik
Fu, Yao-Tsung
Zartman, Gregory D.
Yoonessi, Mitra
Drummy, Lawrence F.
TI Bending of layered silicates on the nanometer scale: Mechanism, stored
energy, and curvature limits
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Heinz, Hendrik; Fu, Yao-Tsung; Zartman, Gregory D.] Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA.
[Drummy, Lawrence F.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Yoonessi, Mitra] Ohio Aerosp Inst, Div Polymer, Cleveland, OH 44135 USA.
EM hendrik.heinz@uakron.edu
RI Heinz, Hendrik/E-3866-2010
OI Heinz, Hendrik/0000-0002-6776-7404
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 685-COLL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475104125
ER
PT J
AU Heinz, H
Feng, J
Jha, KC
Berry, RJ
Naik, RR
Farmer, BL
AF Heinz, Hendrik
Feng, Jie
Jha, Kshitij C.
Berry, Rajiv J.
Naik, Rajesh R.
Farmer, Barry L.
TI Mechanism of adsorption of peptides and surfactants on metal surfaces
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Heinz, Hendrik; Feng, Jie; Jha, Kshitij C.] Univ Akron, Dept Polymer Engn, Akron, OH 44325 USA.
[Berry, Rajiv J.; Naik, Rajesh R.; Farmer, Barry L.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM hendrik.heinz@uakron.edu
RI Heinz, Hendrik/E-3866-2010
OI Heinz, Hendrik/0000-0002-6776-7404
NR 0
TC 0
Z9 0
U1 0
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 518-COLL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475103957
ER
PT J
AU Hong, GY
Pachter, R
AF Hong, Gongyi
Pachter, Ruth
TI Oxygen inhibition of the biocatalysis in [Fe-Fe] hydrogenases: A
combination of empirical molecular dynamics and density functional
theory calculations
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Hong, Gongyi; Pachter, Ruth] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM gongyi.hong.ctr@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 1
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 383-COMP
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475104564
ER
PT J
AU Jones, SE
AF Jones, Sharon E.
TI Isolation and characterization of peptides that interact with graphene
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Jones, Sharon E.] Air Force Res Lab, Nanostruct & Biol Mat Branch, Wright Patterson AFB, OH 45433 USA.
EM sharon.jones@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 1
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 173-BIOL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475100498
ER
PT J
AU Keck, SD
Knoerzer, TA
Iacono, ST
AF Keck, Stephen D.
Knoerzer, Timm A.
Iacono, Scott T.
TI Chemical detection and decontamination of G series nerve agents: A novel
method for detection combining phosphorescing organic detectors with
conductive polymers
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Keck, Stephen D.; Knoerzer, Timm A.; Iacono, Scott T.] USAF Acad, Dept Chem, Colorado Springs, CO 80840 USA.
EM c12stephen.keck@usafa.edu
NR 0
TC 0
Z9 0
U1 0
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 1366-CHED
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475103047
ER
PT J
AU Kettwich, SC
Pierson, SN
Iacono, ST
AF Kettwich, Sharon C.
Pierson, Scott N.
Iacono, Scott T.
TI Structure-property relationships of partially fluorinated silsesquioxane
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 243rd National Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc
C1 [Kettwich, Sharon C.; Pierson, Scott N.; Iacono, Scott T.] US Air Force Acad, Dept Chem, Colorado Springs, CO 80840 USA.
EM sharon.kettwich@usafa.edu
NR 0
TC 0
Z9 0
U1 1
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 336-POLY
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219JX
UT WOS:000324503204584
ER
PT J
AU Knoerzer, TA
Hicks, BW
AF Knoerzer, Timm A.
Hicks, Barry W.
TI What we're doing isn't working: An alternative to the traditional
general chemistry course
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Knoerzer, Timm A.; Hicks, Barry W.] US Air Force Acad, USAF Acad, CO 80840 USA.
EM timm.knoerzer@usafa.edu
NR 0
TC 0
Z9 0
U1 0
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 112-CHED
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475101823
ER
PT J
AU Kusel, BS
Iacono, ST
Kettwich, SC
AF Kusel, Bradley S.
Iacono, Scott T.
Kettwich, Sharon C.
TI Synthesis and optimization of fluorinated epoxy resins
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Kusel, Bradley S.; Iacono, Scott T.; Kettwich, Sharon C.] USAF Acad, Dept Chem, Colorado Springs, CO 80840 USA.
EM c12bradley.kusel@usafa.edu
NR 0
TC 0
Z9 0
U1 1
U2 1
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 1363-CHED
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475103044
ER
PT J
AU Lovingood, D
Simpson, K
Owens, J
AF Lovingood, Derek
Simpson, Katherine
Owens, Jeffery
TI Modification of cotton fibers with silica nanoparticles and silica
species via microwave synthetic techniques for adsorption of chemical
agents
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Lovingood, Derek] Oak Ridge Inst Sci & Educ, Belcamp, MD 21017 USA.
[Simpson, Katherine] Univ Technol Corp, Tyndall AFB, FL 32403 USA.
[Owens, Jeffery] Air Force Res Lab, Tyndall AFB, FL 32403 USA.
EM derek.lovingood.ctr@tyndall.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 530-COLL
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475103968
ER
PT J
AU McConney, ME
Natarajan, LV
Dunning, M
Tondigilia, VP
White, TJ
Bunning, TJ
AF McConney, Michael E.
Natarajan, Lalgudi V.
Dunning, Madeline
Tondigilia, Vincent P.
White, Timothy J.
Bunning, Timothy J.
TI Helicoidally structured gels undergoing order-disorder phase transitions
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 243rd National Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc
C1 [McConney, Michael E.; Natarajan, Lalgudi V.; Dunning, Madeline; Tondigilia, Vincent P.; White, Timothy J.; Bunning, Timothy J.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM timothy.bunning@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 239-PMSE
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219JX
UT WOS:000324503203943
ER
PT J
AU Park, K
Nepal, D
Biswas, S
Vaia, RA
AF Park, Kyoungweon
Nepal, Dhriti
Biswas, Sushmita
Vaia, Richard A.
TI Discrete, monodisperse, plasmonic nano-architectures by solvent induced
assembly of poly (ethylene glycol) functionalized gold nanorods
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 243rd National Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc
C1 [Park, Kyoungweon; Nepal, Dhriti; Biswas, Sushmita; Vaia, Richard A.] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM kyoungweon.park.ctr@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 204-PMSE
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219JX
UT WOS:000324503203908
ER
PT J
AU Roy, J
Lau, C
Atanassov, P
Luckarift, H
Eby, DM
Johnson, GR
AF Roy, Jared
Lau, Carolin
Atanassov, Plamen
Luckarift, Heather
Eby, D. Matthew
Johnson, Glenn R.
TI Shewanella oneidensis MR-1 biofilm formation induced by polarized
surfaces
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Roy, Jared; Lau, Carolin; Atanassov, Plamen] Univ New Mexico, Dept Chem & Nucl Engn, Albuquerque, NM 87121 USA.
[Luckarift, Heather; Eby, D. Matthew; Johnson, Glenn R.] Air Force Res Lab, Tyndall AFB, FL 32403 USA.
EM jaredunm@unm.edu
NR 0
TC 0
Z9 0
U1 0
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 542-ENVR
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475105301
ER
PT J
AU Trohalaki, S
Luckadrift, HR
Johnson, GR
Pachter, R
AF Trohalaki, Steven
Luckadrift, Heather R.
Johnson, Glenn R.
Pachter, Ruth
TI Immobilization of laccases on single-walled carbon nanotube electrodes:
A molecular dynamics study
SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Meeting Abstract
CT 11th International Biorelated Polymer Symposium / 243rd National Spring
Meeting of the American-Chemical-Society (ACS)
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Polymer Chem Inc, Amer Chem Soc
C1 [Trohalaki, Steven; Pachter, Ruth] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Trohalaki, Steven] Gen Dynam Informat Technol Inc, Dayton, OH 45324 USA.
[Luckadrift, Heather R.; Johnson, Glenn R.] Air Force Res Lab, Mat & Mfg Directorate, Tyndall AFB, FL 45433 USA.
EM steven.trohalaki@wpafb.af.mil
NR 0
TC 0
Z9 0
U1 0
U2 2
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0065-7727
J9 ABSTR PAP AM CHEM S
JI Abstr. Pap. Am. Chem. Soc.
PD MAR 25
PY 2012
VL 243
MA 615-COMP
PG 1
WC Chemistry, Multidisciplinary
SC Chemistry
GA 219AH
UT WOS:000324475104772
ER
PT J
AU Cho, HD
Zakirov, AS
Yuldashev, SU
Ahn, CW
Yeo, YK
Kang, TW
AF Cho, Hak Dong
Zakirov, Anvar S.
Yuldashev, Shavkat U.
Ahn, Chi Won
Yeo, Yung Kee
Kang, Tae Won
TI Photovoltaic device on a single ZnO nanowire p-n homojunction
SO NANOTECHNOLOGY
LA English
DT Article
ID SILICON NANOWIRES; SOLAR-CELLS; ZINC-OXIDE; NANOGENERATORS; ARRAYS;
LASERS
AB A photovoltaic device was successfully grown solely based on the single ZnO p-n homojunction nanowire. The ZnO nanowire p-n diode consists of an as- grown n-type segment and an in situ arsenic-doped p-type segment. This p-n homojunction acts as a good photovoltaic cell, producing a photocurrent almost 45 times larger than the dark current under reverse-biased conditions. Our results demonstrate that the present ZnO p-n homojunction nanowire can be used as a self-powered ultraviolet photodetector as well as a photovoltaic cell, which can also be used as an ultralow electrical power source for nanoscale electronic, optoelectronic and medical devices.
C1 [Cho, Hak Dong; Zakirov, Anvar S.; Yuldashev, Shavkat U.; Kang, Tae Won] Dongguk Univ Seoul, Quantum Funct Semicond Res Ctr, Seoul 100715, South Korea.
[Zakirov, Anvar S.; Yuldashev, Shavkat U.] Uzbek Acad Sci, Dept Thermophys, Tashkent 700135, Uzbekistan.
[Ahn, Chi Won] Korea Adv Inst Sci & Technol, Nanomat Lab, Natl Nanofab Ctr, Taejon 305806, South Korea.
[Yeo, Yung Kee] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
RP Cho, HD (reprint author), Dongguk Univ Seoul, Quantum Funct Semicond Res Ctr, Seoul 100715, South Korea.
EM twkang@dongguk.edu
FU National Research Foundation of Korea (NRF); Korean government's
Ministry of Education, Science and Technology (MEST) [2011-0000016];
NRF; MEST [2011-00125]
FX This work was supported by a National Research Foundation of Korea (NRF)
grant funded by the Korean government's Ministry of Education, Science
and Technology (MEST) (no. 2011-0000016) and by the Leading Foreign
Research Institute Recruitment Program through the NRF funded by the
MEST (no. 2011-00125).
NR 31
TC 23
Z9 23
U1 2
U2 69
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0957-4484
J9 NANOTECHNOLOGY
JI Nanotechnology
PD MAR 23
PY 2012
VL 23
IS 11
AR 115401
DI 10.1088/0957-4484/23/11/115401
PG 6
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Physics, Applied
SC Science & Technology - Other Topics; Materials Science; Physics
GA 910SI
UT WOS:000301661700006
PM 22383446
ER
PT J
AU Tao, X
Bortnik, J
Thorne, RM
Albert, JM
Li, W
AF Tao, X.
Bortnik, J.
Thorne, R. M.
Albert, J. M.
Li, W.
TI Effects of amplitude modulation on nonlinear interactions between
electrons and chorus waves
SO GEOPHYSICAL RESEARCH LETTERS
LA English
DT Article
ID MAGNETIC-FIELD; VLF WAVES; MAGNETOSPHERE; ACCELERATION; EMISSIONS
AB The effects of amplitude modulation on nonlinear interactions between a parallel propagating chorus wave packet and electrons in a dipole field are investigated in this work using a test particle code. Previous research used a single wave to model a chorus wave element, leading to nonlinear processes such as phase trapping and bunching when the wave amplitude was large enough. However, high resolution observations of chorus wave packets show a modulation of the wave amplitude, forming the so-called chorus subpackets or subelements. Here we first extend a previous method to model a realistic chorus packet. Using the modeled chorus packet, we demonstrate directly that including the realistic amplitude modulation could significantly affect the behavior of resonant electrons. Our results suggest that the amplitude modulation should be considered in the quantitative treatment of interactions between electrons and chorus waves. Citation: Tao, X., J. Bortnik, R. M. Thorne, J. M. Albert, and W. Li (2012), Effects of amplitude modulation on nonlinear interactions between electrons and chorus waves, Geophys. Res. Lett., 39, L06102, doi:10.1029/2012GL051202.
C1 [Tao, X.; Bortnik, J.; Thorne, R. M.; Li, W.] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA.
[Albert, J. M.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Tao, X (reprint author), Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, 405 Hilgard Ave,7115 Math Sci Bldg, Los Angeles, CA 90095 USA.
EM xtao@atmos.ucla.edu
RI Li, Wen/F-3722-2011;
OI Albert, Jay/0000-0001-9494-7630
FU NSF [0903802]; NSF/DOE; NASA [NNX11AR64G, NAS5-02099]
FX This research was supported at UCLA by NSF grant 0903802, which was
awarded through the NSF/DOE Plasma Partnership program, and NASA grant
NNX11AR64G. We acknowledge NASA contract NAS5-02099 and V. Angelopoulos
for use of data from the THEMIS mission, specifically A. Roux and O.
LeContel for use of SCM data.
NR 22
TC 32
Z9 32
U1 1
U2 4
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0094-8276
EI 1944-8007
J9 GEOPHYS RES LETT
JI Geophys. Res. Lett.
PD MAR 22
PY 2012
VL 39
AR L06102
DI 10.1029/2012GL051202
PG 5
WC Geosciences, Multidisciplinary
SC Geology
GA 914GG
UT WOS:000301936900001
ER
PT J
AU Stauffer, HU
Miller, JD
Roy, S
Gord, JR
Meyer, TR
AF Stauffer, Hans U.
Miller, Joseph D.
Roy, Sukesh
Gord, James R.
Meyer, Terrence R.
TI Communication: Hybrid femtosecond/picosecond rotational coherent
anti-Stokes Raman scattering thermometry using a narrowband
time-asymmetric probe pulse
SO JOURNAL OF CHEMICAL PHYSICS
LA English
DT Article
ID GAS-PHASE THERMOMETRY; SPECTROSCOPY; TEMPERATURE; SUPPRESSION; PRESSURE
AB A narrowband, time-asymmetric probe pulse is introduced into the hybrid femtosecond/picosecond rotational coherent anti-Stokes Raman scattering (fs/ps RCARS) technique to provide accurate and precise single-shot, high-repetition-rate gas-phase thermometric measurements. This narrowband pulse-generated by inserting a Fabry-Perot etalon into the probe-pulse beam path-enables frequency-domain detection of pure-rotational transitions. The unique time-asymmetric nature of this pulse, in turn, allows for detection of resonant Raman-active rotational transitions free of signal contamination by nonresonant four-wave-mixing processes while still allowing detection at short probe-pulse delays, where collisional dephasing processes are negligible. We demonstrate that this approach provides excellent single-shot thermometric accuracy (<1% error) and precision (similar to 2.5%) in gas-phase environments. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3693669]
C1 [Stauffer, Hans U.; Roy, Sukesh] Spectral Energies LLC, Dayton, OH 45431 USA.
[Miller, Joseph D.; Meyer, Terrence R.] Iowa State Univ, Dept Mech Engn, Ames, IA 50011 USA.
[Gord, James R.] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Stauffer, HU (reprint author), Spectral Energies LLC, 5100 Springfield St,Suite 301, Dayton, OH 45431 USA.
EM hans.stauffer.ctr@wpafb.af.mil
FU National Science Foundation (NSF) [CBET-1056006]; Air Force Office of
Scientific Research; Air Force Research Laboratory (AFRL)
[FA8650-10-C-2008]
FX Funding was provided, in part, by the National Science Foundation (NSF)
(CBET-1056006, Dr. Arvind Atreya, Program Official), the Air Force
Office of Scientific Research (Dr. Enrique Parra, Program Manager), and
the Air Force Research Laboratory (AFRL) under Contract No.
FA8650-10-C-2008. J.D.M. was supported by the National Science
Foundation Graduate Fellowship Program.
NR 14
TC 18
Z9 18
U1 3
U2 21
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-9606
J9 J CHEM PHYS
JI J. Chem. Phys.
PD MAR 21
PY 2012
VL 136
IS 11
AR 111101
DI 10.1063/1.3693669
PG 4
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 917YG
UT WOS:000302214200001
PM 22443740
ER
PT J
AU Aveiro, HC
Hysell, DL
Caton, RG
Groves, KM
Klenzing, J
Pfaff, RF
Stoneback, R
Heelis, RA
AF Aveiro, H. C.
Hysell, D. L.
Caton, R. G.
Groves, K. M.
Klenzing, J.
Pfaff, R. F.
Stoneback, R.
Heelis, R. A.
TI Three-dimensional numerical simulations of equatorial spread F: Results
and observations in the Pacific sector
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID IONOSPHERIC PLASMA CLOUDS; SCATTERING LAYERS; DRIFT WAVES; RADAR;
IRREGULARITIES; INSTABILITY; DYNAMICS; ECHOES; MODEL; WINDS
AB A three-dimensional numerical simulation of plasma density irregularities in the postsunset equatorial F region ionosphere leading to equatorial spread F (ESF) is described. The simulation evolves under realistic background conditions including bottomside plasma shear flow and vertical current. It also incorporates C/NOFS satellite data which partially specify the forcing. A combination of generalized Rayleigh-Taylor instability (GRT) and collisional shear instability (CSI) produces growing waveforms with key features that agree with C/NOFS satellite and ALTAIR radar observations in the Pacific sector, including features such as gross morphology and rates of development. The transient response of CSI is consistent with the observation of bottomside waves with wavelengths close to 30 km, whereas the steady state behavior of the combined instability can account for the 100+ km wavelength waves that predominate in the F region.
C1 [Aveiro, H. C.; Hysell, D. L.] Cornell Univ, Ithaca, NY 14853 USA.
[Caton, R. G.] USAF, Res Lab, Kirtland AFB, NM 87117 USA.
[Groves, K. M.] USAF, Res Lab, Space Vehicles Directorate, Hanscom AFB, MA 01731 USA.
[Stoneback, R.; Heelis, R. A.] Univ Texas Dallas, Hanson Ctr Space Sci, Richardson, TX 75080 USA.
[Klenzing, J.; Pfaff, R. F.] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
RP Aveiro, HC (reprint author), Cornell Univ, 2122 Snee Hall, Ithaca, NY 14853 USA.
EM hca24@cornell.edu
RI Klenzing, Jeff/E-2406-2011; Pfaff, Robert/F-5703-2012;
OI Klenzing, Jeff/0000-0001-8321-6074; Pfaff, Robert/0000-0002-4881-9715;
Stoneback, Russell/0000-0001-7216-4336
FU Air Force Office of Sponsored Research [FA9550-09-1-0337]; NASA
[NNX10AM94G]
FX This work was supported by award FA9550-09-1-0337 from the Air Force
Office of Sponsored Research to Cornell University. The CINDI project is
supported at the University of Texas at Dallas by NASA grant NNX10AM94G.
Special thanks go to Dale Sponseller and the rest of the Kwajalein Range
Systems crew at the Kwajalein Missile Range for their support during the
2009 C/NOFS campaign.
NR 32
TC 12
Z9 12
U1 0
U2 3
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-9380
EI 2169-9402
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR 21
PY 2012
VL 117
AR A03325
DI 10.1029/2011JA017077
PG 10
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 914GY
UT WOS:000301938900001
ER
PT J
AU Kuznetsov, O
Sun, YQ
Thaner, R
Bratt, A
Shenoy, V
Wong, MS
Jones, J
Billups, WE
AF Kuznetsov, Oleksandr
Sun, Yanqiu
Thaner, Ryan
Bratt, Ariana
Shenoy, Varun
Wong, Michael S.
Jones, John
Billups, W. E.
TI Water-Soluble Nanodiamond
SO LANGMUIR
LA English
DT Article
ID SURFACE FUNCTIONALIZATION; BIOMEDICAL APPLICATIONS; NANOSCALE DIAMOND;
CARBON NANOTUBES; GRAPHITIZATION; POWDER
AB Reduction of the graphenic edges of annealed nanodiamond by sodium in liquid ammonia leads to a nanodiamond salt that reacts with either alkyl or aryl halides by electron transfer to yield radical anions that dissociate spontaneously into free radicals and halide. The free radicals were observed to add readily to the aromatic rings of the annealed nanodiamond. Nanodiamonds functionalized by phenyl radicals were sulfonated in oleum, and the resulting sulfonic acid was converted to the sodium salt by treatment with sodium hydroxide. The solubility of the salt in water was determined to be 248 mg/L. Nanodiamond functionalized by carboxylic acid groups could be prepared by reacting 5-bromovaleric acid with the annealed nanodiamond salt. The solubility of the sodium carboxylate in water was found to be 160 mg/L.
C1 [Sun, Yanqiu; Thaner, Ryan; Bratt, Ariana; Billups, W. E.] Rice Univ, Dept Chem, Houston, TX 77005 USA.
[Sun, Yanqiu; Thaner, Ryan; Bratt, Ariana; Billups, W. E.] Rice Univ, Richard E Smalley Inst Nanoscale Sci & Technol, Houston, TX 77005 USA.
[Kuznetsov, Oleksandr] Rice Univ, Dept Phys, Houston, TX 77005 USA.
[Shenoy, Varun; Wong, Michael S.] Rice Univ, Dept Chem & Biomol Engn, Houston, TX 77005 USA.
[Jones, John] USAF, Res Lab, Mat & Mfg Directorate, Thermal Sci & Mat Branch, Wright Patterson AFB, OH 45433 USA.
RP Billups, WE (reprint author), Rice Univ, Dept Chem, 6100 Main St, Houston, TX 77005 USA.
EM billups@rice.edu
RI Wong, Michael/F-9286-2010
OI Wong, Michael/0000-0002-3652-3378
FU Robert A. Welch Foundation [C-0490]
FX We gratefully acknowledge the Robert A. Welch Foundation (C-0490) for
support of this work. We thank Dr. G. C. Kini for fruitful discussions.
NR 27
TC 11
Z9 12
U1 1
U2 46
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0743-7463
J9 LANGMUIR
JI Langmuir
PD MAR 20
PY 2012
VL 28
IS 11
BP 5243
EP 5248
DI 10.1021/la204660h
PG 6
WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science,
Multidisciplinary
SC Chemistry; Materials Science
GA 910KZ
UT WOS:000301636900041
PM 22360371
ER
PT J
AU Fritsche, M
Pandey, RB
Farmer, BL
Heermann, DW
AF Fritsche, Miriam
Pandey, Ras B.
Farmer, Barry L.
Heermann, Dieter W.
TI Conformational Temperature-Dependent Behavior of a Histone H2AX: A
Coarse-Grained Monte Carlo Approach Via Knowledge-Based Interaction
Potentials
SO PLOS ONE
LA English
DT Article
ID DNA-DAMAGE; SIMULATIONS; MODEL; PROTEINS; DYNAMICS; PEPTIDE
AB Histone proteins are not only important due to their vital role in cellular processes such as DNA compaction, replication and repair but also show intriguing structural properties that might be exploited for bioengineering purposes such as the development of nano-materials. Based on their biological and technological implications, it is interesting to investigate the structural properties of proteins as a function of temperature. In this work, we study the spatial response dynamics of the histone H2AX, consisting of 143 residues, by a coarse-grained bond fluctuating model for a broad range of normalized temperatures. A knowledge-based interaction matrix is used as input for the residue-residue Lennard-Jones potential.
We find a variety of equilibrium structures including global globular configurations at low normalized temperature (T* = 0.014), combination of segmental globules and elongated chains (T* = 0.016,0.017), predominantly elongated chains (T* = 0.019,0.020), as well as universal SAW conformations at high normalized temperature (T* >= 0.023). The radius of gyration of the protein exhibits a non-monotonic temperature dependence with a maximum at a characteristic temperature (T-c* = 0.019) where a crossover occurs from a positive (stretching at T* <= T-c*) to negative (contraction at T* >= T-c*) thermal response on increasing T*.
C1 [Fritsche, Miriam; Heermann, Dieter W.] Heidelberg Univ, Inst Theoret Phys, Heidelberg, Germany.
[Pandey, Ras B.] Univ So Mississippi, Dept Phys & Astron, Hattiesburg, MS 39406 USA.
[Farmer, Barry L.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Heermann, Dieter W.] Jackson Lab, Inst Mol Biophys, Bar Harbor, ME 04609 USA.
[Heermann, Dieter W.] Interdisciplinary Ctr Sci Comp, Heidelberg, Germany.
RP Fritsche, M (reprint author), Heidelberg Univ, Inst Theoret Phys, Heidelberg, Germany.
EM fritsche@tphys.uni-heidelberg.de
FU Air Force Research Laboratory; Alexander von Humboldt foundation
FX Support from the Air Force Research Laboratory and Alexander von
Humboldt foundation is gratefully acknowledged. The funders had no role
in study design, data collection and analysis, decision to publish, or
preparation of the manuscript.
NR 46
TC 3
Z9 3
U1 0
U2 10
PU PUBLIC LIBRARY SCIENCE
PI SAN FRANCISCO
PA 1160 BATTERY STREET, STE 100, SAN FRANCISCO, CA 94111 USA
SN 1932-6203
J9 PLOS ONE
JI PLoS One
PD MAR 19
PY 2012
VL 7
IS 3
AR e32075
DI 10.1371/journal.pone.0032075
PG 8
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 939TA
UT WOS:000303836500004
PM 22442661
ER
PT J
AU Michell, RG
McHarg, MG
Samara, M
Hampton, DL
AF Michell, R. G.
McHarg, M. G.
Samara, M.
Hampton, D. L.
TI Spectral analysis of flickering aurora
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID ALIGNED ELECTRON FLUX; ION-CYCLOTRON WAVES
AB We present a case study of a flickering aurora event observed from Poker Flat, Alaska. The data were recorded using an Andor EMCCD narrow field of view (15 degrees x 15 degrees) imager. The images were recorded at 33.58 frames per second resulting in 256 x 256 pixel images. The specific event analyzed consists of a time series of images lasting approximately 30 seconds (1000 images) where flickering aurora was observed throughout the entire sequence. An asymmetry was found in the scale size of the patches, with the East-West direction being approximately twice as large as the North-South direction. The calculation of the spatiotemporal spectra reveals that the temporal frequencies of the luminosity variations occur throughout the well-defined range of 5 Hz to 14 Hz, with a sharp increase in power around 5 Hz and the peak at approximately 10 Hz. These data are compared to the theoretically calculated dispersion relation for ion cyclotron waves and the observed wave power can be bounded by using a k(parallel to) between 1 x 10(-5) m(-1) and 3 x 10(-5) m-(1) for an altitude of 3100 km. Observationally there is a lack of power at values of k(perpendicular to) larger than similar to 2 x 10(-3) m(-1), suggesting the existence of a minimum spatial scale for flickering auroral patches of approximately the O+ ion gyroradius (similar to 1 km) at the interaction altitude.
C1 [Michell, R. G.; Samara, M.] SW Res Inst, Dept Space Sci & Engn, San Antonio, TX 78238 USA.
[McHarg, M. G.] USAF Acad, Dept Phys, Colorado Springs, CO 80840 USA.
[Hampton, D. L.] Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA.
RP Michell, RG (reprint author), SW Res Inst, Dept Space Sci & Engn, 6220 Culebra Rd, San Antonio, TX 78238 USA.
EM rmichell@swri.edu
FU National Science Foundation [ATM-0836410]; PFISR
FX This work was supported by National Science Foundation grant
ATM-0836410. The authors thank SRI International for their support in
the operation of PFISR. Many thanks to the referees, whose comments
significantly improved the quality of this paper.
NR 13
TC 5
Z9 5
U1 1
U2 1
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR 17
PY 2012
VL 117
AR A03321
DI 10.1029/2011JA016703
PG 9
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 910TZ
UT WOS:000301667000001
ER
PT J
AU Johnsen, MG
Lorentzen, DA
Holmes, JM
Lovhaug, UP
AF Johnsen, M. G.
Lorentzen, D. A.
Holmes, J. M.
Lovhaug, U. P.
TI A model based method for obtaining the open/closed field line boundary
from the cusp auroral 6300 angstrom[OI] red line
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID INTERPLANETARY MAGNETIC-FIELD; EISCAT SVALBARD RADAR; POLAR-CAP;
PARTICLE-PRECIPITATION; MAGNETOSPHERIC CUSPS; OPTICAL MEASUREMENTS;
SPATIAL VARIATION; F-REGION; IONOSPHERE; PLASMA
AB Ground based optical instruments are invaluable tools for studies of processes associated with the cusps and auroral morphology. In this work we present a method for obtaining the magnetic latitude of the open/closed field line boundary (OCB) from the cusp 6300 angstrom[OI] auroral red line using a meridian scanning photometer. The method which is based on a pre-defined reference cusp aurora produced by the GLOW model is examined with respect to uncertainties, and we describe how a set of equations describing the error is constructed. The method is applicable to data from optical instruments located at high latitude observation sites such as Svalbard and Antarctica. Equations describing both errors and the mapping altitude for transforming the OCB from instrument centered coordinates to magnetic latitude for instrumentation located in Svalbard (Longyearbyen) are presented. Further, by applying the GLOW model we present results illustrating the great variability in the altitude profile of the atomic oxygen 6300 angstrom[OI] red line emission in the cusp. A simple calculation showing how a poleward neutral wind will change the latitudinal shape of the cusp aurora is also performed.
C1 [Johnsen, M. G.; Lovhaug, U. P.] Univ Tromso, Fac Sci & Technol, Tromso Geophys Observ, N-9037 Tromso, Norway.
[Lorentzen, D. A.] Univ Ctr Svalbard, Dept Geophys, N-9171 Longyearbyen, Norway.
[Holmes, J. M.] USAF, Space Vehicles Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
RP Johnsen, MG (reprint author), Univ Tromso, Fac Sci & Technol, Tromso Geophys Observ, N-9037 Tromso, Norway.
EM magnar.g.johnsen@uit.no
NR 64
TC 12
Z9 12
U1 1
U2 6
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR 16
PY 2012
VL 117
AR A03319
DI 10.1029/2011JA016980
PG 13
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 910TX
UT WOS:000301666700002
ER
PT J
AU Kuo, S
Snyder, A
Kossey, P
Chang, CL
Labenski, J
AF Kuo, Spencer
Snyder, Arnold
Kossey, Paul
Chang, Chia-Lie
Labenski, John
TI Beating HF waves to generate VLF waves in the ionosphere
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID MODULATED POLAR ELECTROJET; THERMAL-INSTABILITY; ELF RADIATION;
EXCITATION
AB Beat-wave generation of very low frequency (VLF) waves by two HF heaters in the ionosphere is formulated theoretically and demonstrated experimentally. The heater-induced differential thermal pressure force and ponderomotive force, which dominate separately in the D and F regions of the ionosphere, drive an electron current for the VLF emission. A comparison, applying appropriate ionospheric parameters shows that the ponderomotive force dominates in beat-wave generation of VLF waves. Three experiments, one in the nighttime in the absence of D and E layers and two in the daytime in the presence of D and E layers, were performed. X mode HF heaters of slightly different frequencies were transmitted at CW full power. VLF waves at 10 frequencies ranging from 3.5 to 21.5 kHz were generated. The frequency dependencies of the daytime and nighttime radiation intensities are quite similar, but the nighttime radiation is much stronger than the daytime one at the same radiation frequency. The intensity ratio is as large as 9 dB at 11.5 kHz. An experiment directly comparing VLF waves generated by the beat-wave approach and by the amplitude modulation (AM) approach was also conducted. The results rule out the likely contribution of the AM mechanism acting on the electrojet and indicate that beat-wave in the VLF range prefers to be generated in the F region of the ionosphere through the ponderomotive nonlinearity, consistent with the theory. In the nighttime experiment, the ionosphere was underdense to the HF heaters, suggesting a likely setting for effective beat-wave generation of VLF waves by the HF heaters.
C1 [Kuo, Spencer] NYU, Polytech Inst, Brooklyn, NY 11201 USA.
[Snyder, Arnold] NW Res Associates, Stockton Springs, ME 04981 USA.
[Kossey, Paul] USAF, Space Vehicles Directorate, Res Lab, AFRL RVBXI, Bedford, MA 01731 USA.
[Chang, Chia-Lie; Labenski, John] BAE Syst Technol Solut, Arlington, VA 22201 USA.
RP Kuo, S (reprint author), NYU, Polytech Inst, 6 MetroTech Ctr, Brooklyn, NY 11201 USA.
EM skuo@duke.poly.edu
FU High Frequency Active Auroral Research Program (HAARP); AFRL at Hanscom
AFB, Massachusetts; Office of Naval Research [ONR-N00014-10-1-0856];
NorthWest Research Associates, Inc. under Air Force Research Laboratory
[FA8718-08-C-0049]; DARPA-DSO
FX We are grateful to Michael McCarrick, David Seafolk-Kopp, Benjamin
Uscinski, and Travis Million for their operation of the HAARP facility
and to James Battis for useful discussions. This work was supported by
the High Frequency Active Auroral Research Program (HAARP), AFRL at
Hanscom AFB, Massachusetts and by the Office of Naval Research, grant
ONR-N00014-10-1-0856. Part of the financial support was arranged through
NorthWest Research Associates, Inc. under Air Force Research Laboratory
contract FA8718-08-C-0049. Two of the authors (C.L.C. and J.L.) would
like to acknowledge support from DARPA-DSO.
NR 29
TC 7
Z9 9
U1 0
U2 0
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR 16
PY 2012
VL 117
AR A03318
DI 10.1029/2011JA017076
PG 9
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 910TX
UT WOS:000301666700006
ER
PT J
AU Bailey, CA
Tondiglia, VT
Natarajan, LV
Bricker, R
Cui, Y
Yang, DK
Bunning, TJ
AF Bailey, C. A.
Tondiglia, V. T.
Natarajan, L. V.
Bricker, R.
Cui, Y.
Yang, D. K.
Bunning, T. J.
TI Surface limitations to the electro-mechanical tuning range of negative
dielectric anisotropy cholesteric liquid crystals
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
AB Recent work on negative dielectric anisotropy cholesteric liquid crystals (CLCs) showed that externally applied dc voltages resulted in blue tuning of the reflection band position up to 20% of its original position. These results also showed that the observed shift in reflection band position was not caused by a direct interaction between the CLC and the applied voltage, but indirectly through electromechanical stresses that deformed the conductive glass substrates, in turn deforming the liquid crystal. In this work, the goal is to clarify that the major limiting factors on the tuning range limit result from the magnitude of the surface anchoring energy and surface induced hysteresis effects. An analytic solution for the tuning range limit and its dependence on the surface and bulk properties is derived that agrees well with the experimental data. Using this model, it was shown that tuning range limits in excess of 35% of the notch position should be expected with typically available alignment materials, and that with proper CLC/surface optimizations, values in the range of 75% are possible. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3694023]
C1 [Bailey, C. A.; Tondiglia, V. T.; Natarajan, L. V.] SAIC, Dayton, OH 45432 USA.
[Bricker, R.; Bunning, T. J.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Cui, Y.; Yang, D. K.] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA.
RP Bailey, CA (reprint author), SAIC, Dayton, OH 45432 USA.
EM christopher.bailey2@wpafb.af.mil
FU Air Force Office of Scientific Research (AFOSR); National Research
Council (NRC)
FX Special thanks are extended for financial support to the Air Force
Office of Scientific Research (AFOSR) and the National Research Council
(NRC).
NR 13
TC 0
Z9 0
U1 2
U2 10
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD MAR 15
PY 2012
VL 111
IS 6
AR 063111
DI 10.1063/1.3694023
PG 9
WC Physics, Applied
SC Physics
GA 918AR
UT WOS:000302221700012
ER
PT J
AU Hay, RS
AF Hay, R. S.
TI Growth stress in SiO2 during oxidation of SiC fibers
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID SILICON OXYCARBIDE GLASSES; THERMAL-OXIDATION; 2-DIMENSIONAL SIMULATION;
VISCOELASTIC MODEL; VISCOUS-FLOW; OXIDE-FILMS; THIN-FILMS; VISCOSITY;
KINETICS; BEHAVIOR
AB A method to calculate growth stress in SiO2 scales formed during SiC fiber oxidation was developed. Calculations were done for Hi-Nicalon (TM)-S SiC fibers using previously measured Deal-Grove oxidation kinetics parameters. Initial compressive stresses in SiO2 of similar to 25 GPa from the 2.2x oxidation volume expansion are rapidly relaxed to lower levels by flow of silica with a shear-stress dependent viscosity. At >1200 degrees, viscous flow of silica relaxes stress to negligible levels. At 700 degrees - 900 degrees C, compressive axial and hoop stress at the GPa level persist, but radial stresses are much smaller. The decrease in growth stress with increase in temperature is a consequence of larger activation energy for silica viscosity than for oxidation kinetics. Radial expansion of the outer scale eventually causes hoop stress to become tensile in the outer scale, and axial stress becomes tensile from the Poisson effect. Tensile hoop stresses can be >1 GPa for thick scales formed at <1000 degrees C. Approximate analytical expressions for growth stress for some limiting cases are discussed. Growth stresses were also calculated for crystallized SiO2 scales; these were qualitatively consistent with microstructural evidence of stress. Assumptions and limitations of the calculation method are discussed, along with the possible effects of growth stress on SiC oxidation kinetics and on SiC fiber strength. [http://dx.doi.org/10.1063/1.3698305]
C1 USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Hay, RS (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
FU Air Force Office of Scientific Research
FX This work was partially supported by funding from the Air Force Office
of Scientific Research.
NR 87
TC 6
Z9 6
U1 2
U2 18
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD MAR 15
PY 2012
VL 111
IS 6
AR 063527
DI 10.1063/1.3698305
PG 13
WC Physics, Applied
SC Physics
GA 918AR
UT WOS:000302221700044
ER
PT J
AU Conforti, PF
Braunstein, M
Stearns, JA
Dodd, JA
AF Conforti, Patrick F.
Braunstein, Matthew
Stearns, Jaime A.
Dodd, James A.
TI Collision Dynamics of O(P-3) + DMMP Using a Specific Reaction Parameters
Potential Form
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID POTENTIAL-ENERGY SURFACES; VINYLCYCLOPROPANE-CYCLOPENTENE REARRANGEMENT;
AB-INITIO; DIMETHYL METHYLPHOSPHONATE; ORGANOPHOSPHORUS COMPOUNDS;
HYPERTHERMAL REACTIONS; PLUS ETHANE; DMMP; DECOMPOSITION; COMBUSTION
AB Starting from previous benchmark CBS-QB3 electronic structure calculations (Conforti, P. F.; Braunstein, M.; Dodd, J. A. J. Phys. Chem. A 2009, 113, 13752), we develop two global potential energy surfaces for O(P-3) + DMMP collisions, using the specific reaction parameters approach. Each surface is simultaneously fit along the three major reaction pathways: hydrogen abstraction, hydrogen elimination, and methyl elimination. We then use these surfaces in classical dynamics simulations and compute reactive cross sections from 4 to 10 km s(-1) collision velocity. We examine the energy disposal and angular distributions of the reactive and nonreactive products. We find that for reactive collisions, an unusually large amount of the initial collision energy is transformed into internal energy. We analyze the nonreactive and reactive product internal energy distributions, many of which fit Boltzmann temperatures up to similar to 2000 K.
C1 [Conforti, Patrick F.; Braunstein, Matthew] Spectral Sci Inc, Burlington, MA 01803 USA.
[Stearns, Jaime A.; Dodd, James A.] USAF, Res Lab, Kirtland AFB, NM 87117 USA.
RP Braunstein, M (reprint author), Spectral Sci Inc, 4 4th Ave, Burlington, MA 01803 USA.
FU DTRA/JSTO [BRCALL07-N-2-0029]; [FA8718-05-C-0077]
FX This work was supported by a DTRA/JSTO basic research program award,
BRCALL07-N-2-0029. M.B. and P.F.C. acknowledge support under Contract
No. FA8718-05-C-0077.
NR 37
TC 2
Z9 2
U1 1
U2 11
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1089-5639
EI 1520-5215
J9 J PHYS CHEM A
JI J. Phys. Chem. A
PD MAR 15
PY 2012
VL 116
IS 10
BP 2506
EP 2518
DI 10.1021/jp210302m
PG 13
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 908SB
UT WOS:000301509400014
PM 22283198
ER
PT J
AU Sell, JF
Gearba, MA
Patterson, BM
Byrne, D
Jemo, G
Lilly, TC
Meeter, R
Knize, RJ
AF Sell, J. F.
Gearba, M. A.
Patterson, B. M.
Byrne, D.
Jemo, G.
Lilly, T. C.
Meeter, R.
Knize, R. J.
TI Collisional excitation transfer between Rb(5P) states in 50-3000 Torr of
He-4
SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
LA English
DT Article
ID FINE-STRUCTURE TRANSITIONS; 795-NM RUBIDIUM LASER; NOBLE-GAS ATOMS;
CROSS-SECTIONS; ALKALI ATOMS; LIFETIME MEASUREMENTS; CONTINUOUS-WAVE;
RB; MOLECULES; RADIATION
AB Measurements of the mixing rates and cross sections for collisional excitation transfer between the 5P(1/2) and 5P(3/2) states of rubidium (Rb) in the presence of He-4 buffer gas are presented. Selected pulses from a high repetition rate, mode-locked femtosecond laser are used to excite either Rb state with the fluorescence due to collisional excitation transfer observed by time-correlated single-photon counting. The time dependence of this fluorescence is fitted to the solution of rate equations which include the mixing rate, atomic lifetimes and any quenching processes. The variation in the mixing rate over a large range of buffer gas densities allows the determination of both the binary collisional transfer cross section and a three-body collisional transfer rate. We do not observe any collisional quenching effects at He-4 pressures up to 6 atm and discuss in detail other systematic effects considered in the experiment.
C1 [Sell, J. F.; Gearba, M. A.; Patterson, B. M.; Byrne, D.; Jemo, G.; Meeter, R.; Knize, R. J.] USAF Acad, Dept Phys, Laser & Opt Res Ctr, Colorado Springs, CO 80840 USA.
[Gearba, M. A.] Univ So Mississippi, Dept Phys & Astron, Hattiesburg, MS 39406 USA.
[Lilly, T. C.] Univ Colorado, Dept Mech & Aerosp Engn, Colorado Springs, CO 80918 USA.
RP Sell, JF (reprint author), USAF Acad, Dept Phys, Laser & Opt Res Ctr, Colorado Springs, CO 80840 USA.
EM jerry.sell@usafa.edu; alina.gearba@usm.edu
FU Air Force Office of Scientific Research; National Science Foundation
[0758185]
FX We gratefully acknowledge the support of this work by the Air Force
Office of Scientific Research and the National Science Foundation (grant
no 0758185).
NR 47
TC 6
Z9 6
U1 1
U2 13
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-4075
J9 J PHYS B-AT MOL OPT
JI J. Phys. B-At. Mol. Opt. Phys.
PD MAR 14
PY 2012
VL 45
IS 5
AR 055202
DI 10.1088/0953-4075/45/5/055202
PG 10
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 898AS
UT WOS:000300707800006
ER
PT J
AU Liu, EB
Wadford, DA
Seto, J
Vu, M
Hudson, NR
Thrasher, L
Torres, S
Dyer, DW
Chodosh, J
Seto, D
Jones, MS
AF Liu, Elizabeth B.
Wadford, Debra A.
Seto, Jason
Vu, Maria
Hudson, Nolan Ryan
Thrasher, Lisa
Torres, Sarah
Dyer, David W.
Chodosh, James
Seto, Donald
Jones, Morris S.
TI Computational and Serologic Analysis of Novel and Known Viruses in
Species Human Adenovirus D in Which Serology and Genomics Do Not
Correlate
SO PLOS ONE
LA English
DT Article
ID HUMAN-IMMUNODEFICIENCY-VIRUS; EPIDEMIC KERATOCONJUNCTIVITIS; MOLECULAR
EVOLUTION; PROVIDES EVIDENCE; RECOMBINATION; IDENTIFICATION; INFECTION;
STRAINS; TYPE-15; SYSTEM
AB In November of 2007 a human adenovirus (HAdV) was isolated from a bronchoalveolar lavage (BAL) sample recovered from a biopsy of an AIDS patient who presented with fever, cough, tachycardia, and expiratory wheezes. To better understand the isolated virus, the genome was sequenced and analyzed using bioinformatic and phylogenomic analysis. The results suggest that this novel virus, which is provisionally named HAdV-D59, may have been created from multiple recombination events. Specifically, the penton, hexon, and fiber genes have high nucleotide identity to HAdV-D19C, HAdV-D25, and HAdV-D56, respectively. Serological results demonstrated that HAdV-D59 has a neutralization profile that is similar yet not identical to that of HAdV-D25. Furthermore, we observed a two-fold difference between the ability of HAdV-D15 and HAdV-D25 to be neutralized by reciprocal antiserum indicating that the two hexon proteins may be more similar in epitopic conformation than previously assumed. In contrast, hexon loops 1 and 2 of HAdV-D15 and HAdV-D25 share 79.13 and 92.56 percent nucleotide identity, respectively. These data suggest that serology and genomics do not always correlate.
C1 [Liu, Elizabeth B.; Seto, Jason; Seto, Donald; Jones, Morris S.] George Mason Univ, Sch Syst Biol, Manassas, VA 20110 USA.
[Wadford, Debra A.; Vu, Maria] Calif Dept Publ Hlth, Viral & Rickettsial Dis Lab, Richmond, CA USA.
[Hudson, Nolan Ryan; Thrasher, Lisa; Torres, Sarah] Travis AFB, David Grant USAF Med Ctr, Fairfield, CA USA.
[Dyer, David W.] Univ Oklahoma, Hlth Sci Ctr, Dept Microbiol & Immunol, Oklahoma City, OK 73190 USA.
[Chodosh, James] Harvard Univ, Massachusetts Eye & Ear Infirm, Sch Med, Howe Lab, Boston, MA USA.
RP Jones, MS (reprint author), George Mason Univ, Sch Syst Biol, Manassas, VA 20110 USA.
EM drmorrisj@yahoo.com
FU United States Air Force Surgeon General [FDG20040024E]; Research to
Prevent Blindness, Inc.; [R01EY013124]; [P30EY014104]
FX This research was financially supported by grant R01EY013124 (DWD, DS,
MSJ and JC) and P30EY014104 (JC). LS, NRH, and MSJ were supported by
United States Air Force Surgeon General grant FDG20040024E. JC is also
funded by an unrestricted grant to the Department of Ophthalmology,
Harvard Medical School, from Research to Prevent Blindness, Inc. The
funders had no role in study design, data collection and analysis,
decision to publish, or preparation of the manuscript.
NR 32
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U1 0
U2 2
PU PUBLIC LIBRARY SCIENCE
PI SAN FRANCISCO
PA 185 BERRY ST, STE 1300, SAN FRANCISCO, CA 94107 USA
SN 1932-6203
J9 PLOS ONE
JI PLoS One
PD MAR 13
PY 2012
VL 7
IS 3
AR e33212
DI 10.1371/journal.pone.0033212
PG 10
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 930IA
UT WOS:000303129700038
PM 22427992
ER
PT J
AU Wu, Y
Sawyer, J
Zhang, ZL
Shneider, MN
Viggiano, AA
AF Wu, Yue
Sawyer, Jordan
Zhang, Zhili
Shneider, Mikhail N.
Viggiano, Albert A.
TI Measurement of sodium-argon cluster ion recombination by coherent
microwave scattering
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID WEAKLY IONIZED PLASMAS; FLOWS; DIAGNOSTICS
AB This present work demonstrates a non-intrusive measurement of the rate constant for sodium-argon cluster ions (Na+center dot Ar) recombining with electrons. The measurements begin with resonance enhanced multi-photon ionization of the Na followed by coherent microwave scattering (radar) to monitor the plasma density. The Na+center dot Ar adduct was formed in a three-body reaction. The plasma decay due to recombination reactions was monitored as a function of time and modeled to determine the rate constant. At 473 K, the rate constant is 1.8(-0.5)(+0.7) x 10(-6) cm(3)/s in an argon buffer at 100 Torr. and initial Na number density of 5.5 x 10(10) cm(-3). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3695064]
C1 [Wu, Yue; Sawyer, Jordan; Zhang, Zhili] Univ Tennessee, Knoxville, TN 37996 USA.
[Shneider, Mikhail N.] Princeton Univ, Princeton, NJ 08544 USA.
[Viggiano, Albert A.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Zhang, ZL (reprint author), Univ Tennessee, Knoxville, TN 37996 USA.
EM zzhang24@utk.edu
RI Zhang, Zhili/F-1305-2010
OI Zhang, Zhili/0000-0002-0831-0471
FU NSF [CBET-1032523]; AFOSR [2303EP]
FX The current work at University of Tennessee was supported by NSF
CBET-1032523. Insightful discussions with Professor Miles at Princeton
University, Dr. Skip Williams, Thomas Miller, and Ray Bemish at the Air
Force Research Laboratory are greatly appreciated. A.A.V. thanks AFOSR
for long term support under 2303EP.
NR 25
TC 0
Z9 0
U1 2
U2 7
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0003-6951
EI 1077-3118
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD MAR 12
PY 2012
VL 100
IS 11
AR 114108
DI 10.1063/1.3695064
PG 4
WC Physics, Applied
SC Physics
GA 917UU
UT WOS:000302204900102
ER
PT J
AU Levin, GA
Jones, WA
Walczak, K
Yerkes, KL
AF Levin, G. A.
Jones, W. A.
Walczak, K.
Yerkes, K. L.
TI Energy transport in closed quantum systems
SO PHYSICAL REVIEW E
LA English
DT Article
AB We examine energy transport in an ensemble of closed quantum systems driven by stochastic perturbations. One can show that the probability and energy fluxes can be described in terms of quantum advection modes (QAMs) associated with the off-diagonal elements of the density matrix. These QAMs play the role of Landauer channels in a system with discrete energy spectrum and the eigenfunctions that cannot be described as plane waves. In order to determine the type of correlations that exist between the direction and magnitudes of each QAM and the average direction of energy and probability fluxes we have numerically solved the time-dependent Schrodinger equation describing a single particle trapped in a parabolic potential well which is perturbed by stochastic ripples. The ripples serve as a localized energy source and are offset to one side of the potential well. As the result a nonzero net energy flux flows from one part of the potential well to another across the symmetry center of the potential. We find that some modes exhibit positive correlation with the direction of the energy flow. Other modes, that carry a smaller energy per unit of the probability flux, anticorrelate with the energy flow and thus provide a backflow of the probability. The overall picture of energy transport that emerges from our results is very different from the conventional one based on a system with continuous energy spectrum.
C1 [Levin, G. A.; Jones, W. A.; Walczak, K.; Yerkes, K. L.] USAF, Prop Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Levin, GA (reprint author), USAF, Prop Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
FU Air Force Office of Scientific Research
FX This work was supported by the Air Force Office of Scientific Research.
We thank Andrew Sommers, George Panasyuk, and Tim Haugan for many
helpful discussions.
NR 12
TC 6
Z9 6
U1 1
U2 3
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1539-3755
J9 PHYS REV E
JI Phys. Rev. E
PD MAR 9
PY 2012
VL 85
IS 3
AR 031109
DI 10.1103/PhysRevE.85.031109
PN 1
PG 11
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 936QH
UT WOS:000303604600003
PM 22587040
ER
PT J
AU Anderson, C
Conde, M
McHarg, MG
AF Anderson, C.
Conde, M.
McHarg, M. G.
TI Neutral thermospheric dynamics observed with two scanning Doppler
imagers: 1. Monostatic and bistatic winds
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID PEROT-INTERFEROMETER MEASUREMENTS; VERTICAL WINDS;
TEMPERATURE-MEASUREMENTS; SPATIAL STRUCTURE; SPECTROMETER; VARIABILITY;
ANTARCTICA; EMISSION; MINIMUM; REGION
AB Doppler-shift measurements of the thermospheric 630.0 nm emission recorded by two spatially separated imaging Fabry-Perot spectrometers in Alaska have been combined to infer F region horizontal wind vectors at approximately 75 locations across their overlapping fields-of-view. These "bistatic" horizontal wind estimates rely only on an assumption regarding the local vertical wind (and assume a common observing volume), and thus represent a more direct measurement of the wind than do the monostatic (single-station) vector wind fields routinely inferred by these instruments. Here we present comparisons between both the independently derived monostatic wind fields from each instrument and the bistatic wind estimates inferred in their common observing volumes. Data are presented from observations on three nights during 2010. Two principal findings have emerged from this study. First, the monostatic technique was found to be capable of estimating the actual large-scale wind field reliably under a large range of geophysical conditions, and is well suited to applications requiring only a large-scale, 'big picture' approximation of the wind flow. Secondly, the bistatic (or tristatic) technique is essential for applications requiring detailed knowledge of the small-scale behavior of the wind, as for example is required when searching for gravity waves.
C1 [Anderson, C.; Conde, M.] Univ Alaska, Inst Geophys, Fairbanks, AK 99775 USA.
[McHarg, M. G.] USAF Acad, Dept Phys, Colorado Springs, CO 80840 USA.
RP Anderson, C (reprint author), Univ Alaska, Inst Geophys, Fairbanks, AK 99775 USA.
EM callum@gi.alaska.edu
NR 28
TC 14
Z9 14
U1 0
U2 1
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR 6
PY 2012
VL 117
AR A03304
DI 10.1029/2011JA017041
PG 17
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 908GC
UT WOS:000301477900001
ER
PT J
AU Anderson, C
Conde, M
McHarg, MG
AF Anderson, C.
Conde, M.
McHarg, M. G.
TI Neutral thermospheric dynamics observed with two scanning Doppler
imagers: 2. Vertical winds
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID PEROT-INTERFEROMETER MEASUREMENTS; OVAL/POLAR CAP BOUNDARY; STABLE
AURORAL ARC; GRAVITY-WAVES; POLAR-CAP; SPECTROMETER OBSERVATIONS;
MIDLATITUDE THERMOSPHERE; HIGH-RESOLUTION; HIGH-LATITUDES; REGION
AB This article is the second in a series of three papers reporting on observations of the 630.0 nm thermospheric airglow emission by two spatially separated scanning Doppler imagers (SDI's) in Alaska. In this article, line-of-sight wind measurements from these instruments in four common-volume regions lying along the great circle joining the two observatories have been used to derive estimates of the vertical wind in those common-volumes. These estimates are combined with the vertical winds measured directly in each of the station zeniths to resolve both the spatial and temporal variations of the vertical wind field. Data from four nights are presented as examples of the wave-like oscillations and frequently high spatial correlations that are observed. A statistical study of data from the full 19-night data set showed that the frequency of observing statistically significant correlation between vertical winds measured at separate locations decreased linearly with increasing separation. A linear fit to this trend indicated that for this particular location and orientation the largest separation over which statistically significant correlation would be expected to occur is approximately 540 km.
C1 [Anderson, C.; Conde, M.] Univ Alaska, Inst Geophys, Fairbanks, AK 99775 USA.
[McHarg, M. G.] USAF Acad, Dept Phys, Colorado Springs, CO 80840 USA.
RP Anderson, C (reprint author), Univ Alaska, Inst Geophys, Fairbanks, AK 99775 USA.
EM callum@gi.alaska.edu
NR 47
TC 4
Z9 4
U1 1
U2 4
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-9380
EI 2169-9402
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD MAR 6
PY 2012
VL 117
AR A03305
DI 10.1029/2011JA017157
PG 15
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 908GC
UT WOS:000301477900003
ER
PT J
AU Hover, MR
AF Hover, Matthew R.
TI The occupation of Iraq: a military perspective on lessons learned
SO INTERNATIONAL REVIEW OF THE RED CROSS
LA English
DT Editorial Material
DE occupation of Iraq; responsibilities of an occupying power; US military
perspective; Coalition Provisional Authority; Operation Iraqi Freedom;
military operational planning; training; inter-agency execution
C1 [Hover, Matthew R.] USA, Washington, DC USA.
[Hover, Matthew R.] USN, Int Law Dept, War Coll, Newport, RI USA.
RP Hover, MR (reprint author), US Cent Command, MacDill AFB, FL USA.
NR 14
TC 1
Z9 1
U1 0
U2 0
PU CAMBRIDGE UNIV PRESS
PI CAMBRIDGE
PA EDINBURGH BLDG, SHAFTESBURY RD, CB2 8RU CAMBRIDGE, ENGLAND
SN 1816-3831
J9 INT REV RED CROSS
JI Int. Rev. Red Cross
PD MAR
PY 2012
VL 94
IS 885
BP 339
EP 346
DI 10.1017/S1816383112000458
PG 8
WC Law
SC Government & Law
GA 047GA
UT WOS:000311825700013
ER
PT J
AU Stephenson, DK
AF Stephenson, David Kimball
TI ECONOMICS AND AUSTERITY RELATIVE TO VETERANS' CLAIMS AND THE VETERANS
APPEAL PROCESS
SO MILITARY LAW REVIEW
LA English
DT Article
C1 [Stephenson, David Kimball] Univ Pacific, McGeorge Sch Law, Stockton, CA 95211 USA.
[Stephenson, David Kimball] USAF, Wright Patterson AFB, OH USA.
RP Stephenson, DK (reprint author), Univ Pacific, McGeorge Sch Law, Stockton, CA 95211 USA.
NR 39
TC 0
Z9 0
U1 0
U2 0
PU JUDGE ADVOCATE GENERALS SCHOOL
PI CHARLOTTESVILLE
PA US ARMY, CHARLOTTESVILLE, VA 22903-1781 USA
SN 0026-4040
J9 MIL LAW REV
JI Milit. Law Rev.
PD SPR
PY 2012
VL 211
BP 179
EP 210
PG 32
WC Law
SC Government & Law
GA 014JL
UT WOS:000309371800004
ER
PT J
AU Curtis, DH
Reeder, MF
Svanberg, CE
Cobb, RG
Parker, GH
AF Curtis, David H.
Reeder, Mark F.
Svanberg, Craig E.
Cobb, Richard G.
Parker, Gregory H.
TI Flapping Wing Micro Air Vehicle Bench Test Setup
SO INTERNATIONAL JOURNAL OF MICRO AIR VEHICLES
LA English
DT Article
ID FLIGHT
AB The purpose of this research was to develop testing methods that can be used to determine the forces, moments, and deflections involved in flapping wing aerodynamics. To pursue the research, a flapping wing mechanism and wings with spans ranging from 9.1 inches to 12.1 inches were built. A variety of mechanisms, capable of, alternatively, purely flapping, flapping with pitch, and flapping with pitch and out-of-plane motion were conceptualized and drawn using solid modeling software. Two of the simpler designs, a single degree-of-freedom flapping mechanism and the two-degree of freedom flapping mechanism were fabricated using a rapid prototype 3-D printer, and sustained operation was demonstrated. A thrust stand and a six-component force balance were used to gather force data from the flapping-only mechanism, combined with a variety of wing shapes. Four high-speed cameras were used to capture the motion of the wings. To minimize intrusiveness an array of laser dots was projected onto the wing during flapping and photogrammetry software was used to analyze the images and determine a shape profile of the wing composed of a frame and membrane during flapping. While the focus of this research was on the bench test setup development, some insight into the influence of wing design on the forces acting on the mechanism was gained.
C1 [Curtis, David H.; Reeder, Mark F.; Svanberg, Craig E.; Cobb, Richard G.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Parker, Gregory H.] USAF, Res Lab AFRL RB, Wright Patterson AFB, OH 45433 USA.
RP Curtis, DH (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM mreeder@afit.edu; craig.svanberg@wpafb.af.mil; rcobb@afit.edu;
gregory.parker@wpafb.af.mil
NR 21
TC 1
Z9 1
U1 2
U2 8
PU MULTI-SCIENCE PUBL CO LTD
PI BRENTWOOD
PA 5 WATES WAY, BRENTWOOD CM15 9TB, ESSEX, ENGLAND
SN 1756-8293
J9 INT J MICRO AIR VEH
JI Int. J. Micro Air Veh.
PD MAR
PY 2012
VL 4
IS 1
BP 51
EP 77
DI 10.1260/1756-8293.4.1.51
PG 27
WC Engineering, Aerospace
SC Engineering
GA 990NF
UT WOS:000307637000004
ER
PT J
AU Golubev, VV
Visbal, MR
AF Golubev, Vladimir V.
Visbal, Miguel R.
TI Modeling MAV Response in Gusty Urban Environment
SO INTERNATIONAL JOURNAL OF MICRO AIR VEHICLES
LA English
DT Article
ID FINITE-DIFFERENCE SCHEMES; LARGE-EDDY SIMULATION; BOUNDARY-LAYER; WIND
FLOW; BLUFF-BODIES; BUILDINGS; COMPUTATION; ROUGHNESS; SPEED; BODY
AB The article discusses an airfoil unsteady aerodynamic response to upstream unsteady flow disturbances in flow regimes characteristic of Micro Air Vehicle (MAV) applications. Because of their small size and speed, the flight control of these vehicles in gusty urban environments poses tremendous challenges addressed in the current work. Following a thorough review of experimental and numerical studies characterizing various scales and configurations of urban flow disturbances, three canonical gust models are proposed corresponding to the time-harmonic gust, the sharp-edge gust, and the Taylor vortex. A high-accuracy numerical analysis is applied to examine MAV airfoil response to such perturbations and conclude on relative importance of contributing viscous and inviscid forces.
C1 [Golubev, Vladimir V.] Embry Riddle Aeronaut Univ, Florida Ctr Adv Aeroprop, Daytona Beach, FL 32114 USA.
[Visbal, Miguel R.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Golubev, VV (reprint author), Embry Riddle Aeronaut Univ, Florida Ctr Adv Aeroprop, Daytona Beach, FL 32114 USA.
EM Vladimir.Golubev@erau.edu; Miguel.Visbal@wpafb.af.mil
FU AFRL/RB research programs; NSF Grant [0955970]; AFOSR
FX The first author acknowledges the partial support for this work through
AFRL/RB research programs and NSF Grant 0955970 (Program Manager Dr.
H.H. Winter). The work of the second author was supported in part by
AFOSR under a task monitored by Dr. D. Smith. The authors would like to
thank Mr. L. Nguyen and Mr. T. Hollenshade for implementing numerical
simulations, and Dr. S. Sherer, Dr. M. Galbraith and Mr. D. Garmann for
their valuable advice.
NR 40
TC 1
Z9 1
U1 0
U2 4
PU MULTI-SCIENCE PUBL CO LTD
PI BRENTWOOD
PA 5 WATES WAY, BRENTWOOD CM15 9TB, ESSEX, ENGLAND
SN 1756-8293
J9 INT J MICRO AIR VEH
JI Int. J. Micro Air Veh.
PD MAR
PY 2012
VL 4
IS 1
BP 79
EP 92
DI 10.1260/1756-8293.4.1.79
PG 14
WC Engineering, Aerospace
SC Engineering
GA 990NF
UT WOS:000307637000005
ER
PT J
AU Selvaraj, C
Munichandraiah, N
Scanlon, LG
AF Selvaraj, C.
Munichandraiah, N.
Scanlon, L. G.
TI Dilithium phthalocyanine as a catalyst for oxygen reduction in
non-aqueous Li-O-2 cells
SO JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
LA English
DT Article
DE dilithium phthalocyanine; catalyst; oxygen reduction; Li-O-2 cells
ID LITHIUM-AIR BATTERY; CARBON-DIOXIDE; ELECTROLYTE; SUPEROXIDE; DENSITY;
ENERGY; ION; O-2
AB The electrochemical performance of Li-O-2 cells depends mainly on the kinetics of the cathode reaction, namely, oxygen reduction reaction in non-aqueous electrolytes. The catalyst plays an important role on the kinetics of the reaction. In the present work, dilithium phthalocyanine is used as the catalyst in the cathode of Li-O-2 cells. Dual-layer O-2 electrodes are fabricated employing a high surface area microporous carbon with Ni gauge current collector present between the two layers. Discharge capacity of Li-O-2 cell measured at 0.2 mA.cm(-2) is about 30 mAh.cm(-2). Phthalocyanine ring is considered to interact with O-2 producing Li2Pc+delta - O-2(-delta) as a reaction intermediate, which facilitates the electron-transfer reaction.
C1 [Selvaraj, C.; Munichandraiah, N.] Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India.
[Scanlon, L. G.] USAF, Res Lab, Thermal & Electrochem Branch, Wright Patterson AFB, OH 45433 USA.
RP Munichandraiah, N (reprint author), Indian Inst Sci, Dept Inorgan & Phys Chem, Bangalore 560012, Karnataka, India.
EM muni@ipc.iisc.ernet.in
FU Asian Office of Aerospace Research and Development (AOARD) of the US Air
Force [FA4869-07-1-4090, FA2386-10-1-4093]
FX The authors thank the Asian Office of Aerospace Research and Development
(AOARD) of the US Air Force for their financial support vide contract
nos. FA4869-07-1-4090 and FA2386-10-1-4093, and Dr. R. Ponnappan of
AOARD for his keen interest in this work.
NR 29
TC 9
Z9 9
U1 3
U2 29
PU WORLD SCI PUBL CO INC
PI HACKENSACK
PA 27 WARREN ST, STE 401-402, HACKENSACK, NJ 07601 USA
SN 1088-4246
J9 J PORPHYR PHTHALOCYA
JI J. Porphyr. Phthalocyanines
PD MAR
PY 2012
VL 16
IS 3
BP 255
EP 259
DI 10.1142/S1088424612200015
PG 5
WC Chemistry, Multidisciplinary
SC Chemistry
GA 947FG
UT WOS:000304413100001
ER
PT J
AU Goodrich, MA
Colton, M
Brinton, B
Fujiki, M
Atherton, JA
Robinson, L
Ricks, D
Maxfield, MH
Acerson, A
AF Goodrich, Michael A.
Colton, Mark
Brinton, Bonnie
Fujiki, Martin
Atherton, J. Alan
Robinson, Lee
Ricks, Daniel
Maxfield, Margaret Hansen
Acerson, Aersta
TI Incorporating a Robot into an Autism Therapy Team
SO IEEE INTELLIGENT SYSTEMS
LA English
DT Article
ID CHILDREN; PLAY
C1 [Goodrich, Michael A.; Colton, Mark; Brinton, Bonnie; Fujiki, Martin; Atherton, J. Alan; Robinson, Lee] Brigham Young Univ, Provo, UT 84602 USA.
[Ricks, Daniel] USAF, Flight Test Ctr, Colorado Springs, CO 80840 USA.
[Maxfield, Margaret Hansen] Intermt Hlth Care, Murray, UT USA.
[Acerson, Aersta] Alpine Sch Dist, Orem, UT USA.
RP Goodrich, MA (reprint author), Brigham Young Univ, Provo, UT 84602 USA.
EM mike@cs.byu.edu; colton@byu.edu; bonnie_brinton@byu.edu;
martin_fujiki@byu.edu; jalanatherton@gmail.com; lee_robinson@byu.edu;
daniel.ricks@edwards.af.mil; maggiemaxfield@gmail.com;
aacerson@alpinedistrict.org
OI Goodrich, Michael/0000-0002-2489-5705
FU Honda Research Institute; Brigham Young University
FX We thank the Honda Research Institute and the Brigham Young University
undergraduate Mentored Environment Grant program for helping fund this
research. We also thank Alan Olsen and Nicole Guillian for their work in
supporting this project as robot designers or programmers. The results
and opinions presented in this article do not necessarily represent the
opinions of the funding agencies.
NR 24
TC 12
Z9 13
U1 0
U2 12
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA
SN 1541-1672
EI 1941-1294
J9 IEEE INTELL SYST
JI IEEE Intell. Syst.
PD MAR-APR
PY 2012
VL 27
IS 2
BP 52
EP 59
PG 8
WC Computer Science, Artificial Intelligence; Engineering, Electrical &
Electronic
SC Computer Science; Engineering
GA 944EH
UT WOS:000304181600010
ER
PT J
AU McCusker, SB
Schmalbach, CE
AF McCusker, Scott B.
Schmalbach, Cecelia E.
TI The Otolaryngologist's Cost in Treating Facial Trauma: American Academy
of Otolaryngology-Head and Neck Surgery Survey
SO OTOLARYNGOLOGY-HEAD AND NECK SURGERY
LA English
DT Article; Proceedings Paper
CT AAO-HNSF Annual Meeting and OTO EXPO
CY SEP 10-14, 2011
CL San Francisco, CA
SP AAO, HNSF
DE socioeconomic; maxillofacial/neck trauma; reimbursement
ID MAXILLOFACIAL TRAUMA; UNITED-STATES; COVERAGE
AB Objectives. (1) To define practice patterns and perceptions of junior otolaryngologists treating maxillofacial/neck trauma. (2) To identify manners in which the American Academy of Otolaryngology-Head and Neck Surgery (AAO-HNS) can meet future trauma needs.
Study Design. Cross-sectional survey.
Setting. Academic and private otolaryngology practices.
Methods. A 26-question survey was designed to identify demographics, practice patterns, perceptions, and areas for improvement in maxillofacial/neck trauma care. It was distributed anonymously to AAO-HNS members completing residency from 2005 to 2009. Analysis included descriptive statistics and x 2 comparisons.
Results. Of 1343 otolaryngologists, 444 (33%) responded. A total of 85% of responding physicians treat maxillofacial/neck trauma, and 64% identify trauma as an ideal part of their practice. Sense of duty (54%), institutional requirements (33%), and enjoyment (32%) are the most common reasons for treating trauma. Major deterrents include patient noncompliance (60%) and lifestyle limitations (47%). Five respondents (3.1%) have been involved in a trauma-related lawsuit. While insufficient reimbursement is a major deterrent to treating trauma (52%), only 36% would increase their volume if reimbursement improved. Increased educational opportunities represent the most common request to the AAO-HNS (59%), followed by AAO-HNS focus on improved reimbursement and tort reform (28%).
Conclusion. Most junior otolaryngologists treat maxillofacial/neck trauma on a monthly basis. A total of 64% identify trauma as a component of their ideal practice. They report being well to very well trained in all facets of trauma, with the exception of vascular and laryngotracheal injuries; but they desire additional education, such as courses and panels. Universal concerns include inadequate reimbursement, limited pool of treating physicians, and lack of practice guidelines.
RP Schmalbach, CE (reprint author), Wilford Hall USAF Med Ctr, Lackland AFB, TX 78236 USA.
EM Cecelia.Schmalbach@us.af.mil
NR 13
TC 5
Z9 5
U1 0
U2 0
PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 0194-5998
J9 OTOLARYNG HEAD NECK
JI Otolaryngol. Head Neck Surg.
PD MAR
PY 2012
VL 146
IS 3
BP 366
EP 371
DI 10.1177/0194599811429007
PG 6
WC Otorhinolaryngology; Surgery
SC Otorhinolaryngology; Surgery
GA 935TX
UT WOS:000303545100005
PM 22095952
ER
PT J
AU Rachbauer, R
Gengler, JJ
Voevodin, AA
Resch, K
Mayrhofer, PH
AF Rachbauer, Richard
Gengler, Jamie J.
Voevodin, Andrey A.
Resch, Katharina
Mayrhofer, Paul H.
TI Temperature driven evolution of thermal, electrical, and optical
properties of Ti-Al-N coatings
SO ACTA MATERIALIA
LA English
DT Article
DE Thermal stability; Thermal conductivity; Electrical resistivity; Optical
reflectivity; TiAlN
ID NITRIDE THIN-FILMS; SUPERSATURATED TI1-XALXN; STABILITY; MICROSTRUCTURE
AB Monolithic single phase cubic (c) Ti1-xAlxN thin films are used in various industrial applications due to their high thermal stability, which beneficially effects lifetime and performance of cutting and milling tools, but also find increasing utilization in electronic and optical devices. The present study elucidates the temperature-driven evolution of heat conductivity, electrical resistivity and optical reflectance from room temperature up to 1400 degrees C and links them to structural and chemical changes in Ti1-xAlxN coatings. It is shown that various decomposition phenomena, involving recovery and spinodal decomposition (known to account for the age hardening phenomenon in c-Ti1-xAlxN), as well as the cubic to wurtzite phase transformation of spinodally formed AlN-enriched domains, effectively increase the thermal conductivity of the coatings from similar to 3.8 W m(-1) K-1 by a factor of three, while the electrical resistivity is reduced by one order of magnitude. A change in the coating color from metallic grey after deposition to reddish-golden after annealing to 1400 degrees C is related to the film structure and discussed in terms of film reflectivity. (C) 2012 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Rachbauer, Richard; Mayrhofer, Paul H.] Univ Leoben, Dept Phys Met & Mat Testing, Christian Doppler Lab Applicat Oriented Coating D, A-8700 Leoben, Austria.
[Gengler, Jamie J.; Voevodin, Andrey A.] USAF, Res Lab, Mat & Mfg Directorate, Thermal Sci & Mat Branch, Wright Patterson AFB, OH 45433 USA.
[Gengler, Jamie J.] Spectral Energies LLC, Dayton, OH 45431 USA.
[Resch, Katharina] Univ Leoben, Dept Polymer Engn & Sci, A-8700 Leoben, Austria.
RP Rachbauer, R (reprint author), Univ Leoben, Dept Phys Met & Mat Testing, Christian Doppler Lab Applicat Oriented Coating D, Franz Josef Str 18, A-8700 Leoben, Austria.
EM richard.rachbauer@unileoben.ac.at
RI Mayrhofer, Paul/A-9640-2011; Voevodin, Andrey/I-6684-2013;
OI Mayrhofer, Paul/0000-0001-7328-9333; Rachbauer,
Richard/0000-0002-7827-3338
FU Austrian Science Fund (FWF-START) [Y371]; Christian Doppler Gesellschaft
within the framework of the Christian Doppler Laboratory for Application
Oriented Coatings Development; US Air Force Research Laboratory
[FA8650-07-D-5800]
FX The authors acknowledge funding by the Austrian Science Fund (FWF-START
Project Y371) and the Christian Doppler Gesellschaft within the
framework of the Christian Doppler Laboratory for Application Oriented
Coatings Development. Dr. David Holeo is acknowledged for supporting the
ab initio calculations. The TDTR efforts at the US Air Force Research
Laboratory were supported under Contract No. FA8650-07-D-5800. The
authors thank the Polymer Competence Center Leoben GmbH for providing
the UV/vis/NIR spectrophotometer for this study.
NR 30
TC 19
Z9 21
U1 6
U2 47
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
EI 1873-2453
J9 ACTA MATER
JI Acta Mater.
PD MAR
PY 2012
VL 60
IS 5
BP 2091
EP 2096
DI 10.1016/j.actamat.2012.01.005
PG 6
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 926MN
UT WOS:000302835300019
ER
PT J
AU Slep, AMS
Heyman, RE
Snarr, JD
Foster, RE
Linkh, DJ
Whitworth, JD
AF Slep, Amy M. Smith
Heyman, Richard E.
Snarr, Jeffery D.
Foster, Rachel E.
Linkh, David J.
Whitworth, James D.
TI Child emotional aggression and abuse: Definitions and prevalence (vol
35, pg 783, 2011)
SO CHILD ABUSE & NEGLECT
LA English
DT Correction
C1 [Slep, Amy M. Smith; Heyman, Richard E.; Snarr, Jeffery D.] SUNY Stony Brook, Dept Psychol, Stony Brook, NY 11794 USA.
[Foster, Rachel E.; Linkh, David J.; Whitworth, James D.] USAF, Family Advocacy Program, Lackland Kelly AFB, San Antonio, TX USA.
RP Slep, AMS (reprint author), NYU, Dept Cariol & Comprehens Care, New York, NY 10010 USA.
NR 1
TC 0
Z9 0
U1 3
U2 11
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0145-2134
J9 CHILD ABUSE NEGLECT
JI Child Abuse Negl.
PD MAR
PY 2012
VL 36
IS 3
BP 268
EP 268
DI 10.1016/j.chiabu.2011.11.002
PG 1
WC Family Studies; Psychology, Social; Social Work
SC Family Studies; Psychology; Social Work
GA 926IB
UT WOS:000302823400010
ER
PT J
AU Jackson, JA
AF Jackson, Julie Ann
TI Analytic Physical Optics Solution for Bistatic, 3D Scattering From a
Dihedral Corner Reflector
SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
LA English
DT Article
DE Bistatic scattering; dihedral; geometrical optics; physical optics;
radar cross section
ID BACKSCATTER; DIFFRACTION; SAR; RCS
AB We derive an analytic scattering model for 3D bistatic scattering from a dihedral using geometrical optics (GO) and physical optics (PO). We use GO to trace ray reflections, and we evaluate the PO integral(s) for the field scattered by each plate of the dihedral. Multiple cases of reflection geometry are considered to account for effects of the dihedral plate size and antenna aspect angles. The complex-valued (amplitude and phase) scattering response is derived. The resulting parametric scattering model is presented in terms of the vertical and horizontal co-polarization and cross-polarization responses that correspond to the outputs of industry-standard numerical prediction codes. Comparing the derived model to available codes for method of moments (MoM), shooting and bouncing rays (SBR), and parametric models (PM), we demonstrate that the derived solution achieves the same accuracy as SBR, approximates MoM, is more accurate than PM, and does so in fast computation time comparable to a PM.
C1 USAF, Inst Technol, Dayton, OH 45433 USA.
RP Jackson, JA (reprint author), USAF, Inst Technol, Dayton, OH 45433 USA.
EM julie.jackson@afit.edu
NR 20
TC 8
Z9 12
U1 0
U2 10
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-926X
J9 IEEE T ANTENN PROPAG
JI IEEE Trans. Antennas Propag.
PD MAR
PY 2012
VL 60
IS 3
BP 1486
EP 1495
DI 10.1109/TAP.2011.2180316
PG 10
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA 924ZH
UT WOS:000302729300031
ER
PT J
AU Wilson, C
AF Wilson, Candy
TI Caring for Military Women and Families as a Nation at War
SO JOGNN-JOURNAL OF OBSTETRIC GYNECOLOGIC AND NEONATAL NURSING
LA English
DT Editorial Material
C1 [Wilson, Candy] USAF, Nurse Corps, Lackland AFB, TX USA.
[Wilson, Candy] USAF, Nursing Res, Lackland AFB, TX USA.
RP Wilson, C (reprint author), 59 Med Wing, Lackland AFB, TX 78236 USA.
EM candy.wilson@lackland.af.mil
NR 0
TC 1
Z9 1
U1 0
U2 0
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0884-2175
J9 JOGNN-J OBST GYN NEO
JI JOGNN
PD MAR-APR
PY 2012
VL 41
IS 2
BP 281
EP 282
DI 10.1111/j.1552-6909.2011.01344.x
PG 2
WC Nursing; Obstetrics & Gynecology
SC Nursing; Obstetrics & Gynecology
GA 927ZC
UT WOS:000302948200016
PM 22834850
ER
PT J
AU Wilson, C
Nelson, JP
AF Wilson, Candy
Nelson, Jenenne P.
TI Exploring the Patterns, Practices, and Experiences of Military Women Who
Managed Genitourinary Symptoms in Deployed Settings
SO JOGNN-JOURNAL OF OBSTETRIC GYNECOLOGIC AND NEONATAL NURSING
LA English
DT Article
DE women's health; military personnel; military medicine; research,
military; military deployment; urogenital system
ID OPERATION-IRAQI-FREEDOM; HEALTH-CARE; STRESS
AB Objective: To gain a better understanding of genitourinary (GU) health during deployment in the context of a military culture.
Design: An ethnographic study design was selected to understand how military women managed GU symptoms during deployment.
Setting: The deployed experiences were recalled from various locations around the world.
Participants: The final sample consisted of 43 military women from the U. S. Army, Air Force, and Navy who were either deployed or had been deployed within the past year.
Methods: Audio recorded interviews ranged from 30 to 75 min in length. Semistructured interviews were used to gather women's stories about their illness behaviors in the deployed setting. Formal interviews, informal interviews, and field notes were included in the data analysis.
Results: Three themes were identified: (a) life in the deployed setting described the location women were referring when they experienced GU symptoms; (b) the dynamics of trust described individuals or entities that were trusted sources of information, supplies, or support; and (c) the sphere of control described the activities utilized to maintain health or manage GU symptoms.
Conclusion: This study is significant to nursing research because it exposes the influence of culture on GU symptom management. Recommendations from this investigation include the following: provide better incremental, predeployment, and in-theater education for women and medics; inform leaders about the need to ensure the supply of self-care treatments and women's feminine hygiene products are available; and promote the role of family support stateside as a resource for information, supplies, and emotional support. JOGNN, 41, 293-302; 2012. DOI: 10.1111/j.1552-6909.2012.01347.x
C1 [Wilson, Candy] USAF, Nurse Corps, Lackland AFB, TX USA.
[Nelson, Jenenne P.] Univ Colorado, Grad Sch, Colorado Springs, CO 80907 USA.
[Wilson, Candy] USAF, Nursing Res, Lackland AFB, TX USA.
RP Wilson, C (reprint author), 59 Med Wing, Lackland AFB, TX 78236 USA.
EM candy.wilson@lackland.af.mil
FU TriService Nursing Research Program [N08-P03]
FX Funded by TriService Nursing Research Program (N08-P03).
NR 18
TC 8
Z9 8
U1 1
U2 2
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0884-2175
J9 JOGNN-J OBST GYN NEO
JI JOGNN
PD MAR-APR
PY 2012
VL 41
IS 2
BP 293
EP 302
DI 10.1111/j.1552-6909.2012.01347.x
PG 10
WC Nursing; Obstetrics & Gynecology
SC Nursing; Obstetrics & Gynecology
GA 927ZC
UT WOS:000302948200018
PM 22834851
ER
PT J
AU Babcock, J
Albertani, R
Abate, G
AF Babcock, Judson
Albertani, Roberto
Abate, Gregg
TI Experimental Estimation of the Rotary Damping Coefficients of a Pliant
Wing
SO JOURNAL OF AIRCRAFT
LA English
DT Article; Proceedings Paper
CT AIAA Atmospheric Flight Mechanics Conference
CY AUG 10-13, 2009
CL Chicago, IL
SP Amer Inst Aeronaut & Astronaut
ID MICRO-AIR-VEHICLE; FLEXIBLE WINGS
AB This paper describes the experimental estimation of the rotary-damping coefficients of micro air vehicle (MAV) wings using a novel system for dynamic wind-tunnel testing. Two geometrically identical Zimmerman wings are used, one rigid and one flexible. The flexible wing consists of a perimeter-reinforced latex membrane with three levels of prestrain. A two-degrees-of-freedom motion rig permits the control of the two individual components of the rotary-damping moment. A modern design of experiments methodology was used to elucidate the correlation between the wings' elastic membrane prestrain state and the aerodynamic characteristics. For the flexible wing, elastic deformations are measured using visual image correlation and evaluated using a dimensionless parameter. The resulting aerodynamic model compares well with static reference data. The presence of dynamic changes in the angle of attack or pitch angle has a significant effect on the response of the rigid and flexible MA V wings, particularly on the pitching moment coefficient. At the current levels of the dimensionless membrane wing elastic prestrain, the pretension strain did not exhibit any correlation with the rotary-damping moment coefficients, whereas the pretension strain level does appear as a factor in the rotary-damping drag coefficient.
C1 [Babcock, Judson; Abate, Gregg] USAF, Res Lab, Munit Directorate, Guidance Nav & Control Branch, Eglin AFB, FL 32542 USA.
[Albertani, Roberto] Univ Florida, Res & Engn Educ Facil, Shalimar, FL 32579 USA.
RP Babcock, J (reprint author), USAF, Res Lab, Munit Directorate, Guidance Nav & Control Branch, Eglin AFB, FL 32542 USA.
EM judson.babcock@gmail.com
NR 30
TC 3
Z9 3
U1 0
U2 1
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0021-8669
J9 J AIRCRAFT
JI J. Aircr.
PD MAR-APR
PY 2012
VL 49
IS 2
BP 390
EP 397
DI 10.2514/1.C031161
PG 8
WC Engineering, Aerospace
SC Engineering
GA 925JV
UT WOS:000302758400005
ER
PT J
AU Randall, R
Shkarayev, S
Abate, G
Babcock, J
AF Randall, Ryan
Shkarayev, Sergey
Abate, Gregg
Babcock, Judson
TI Longitudinal Aerodynamics of Rapidly Pitching Fixed-Wing Micro Air
Vehicles
SO JOURNAL OF AIRCRAFT
LA English
DT Article; Proceedings Paper
CT 49th AIAA Aerospace Sciences Meeting/New Horizons Forum and Aerospace
Exposition
CY JAN 03-07, 2011
CL Orlando, FL
SP AIAA
ID PLATE
AB Some fixed-wing vertical-takeoff-and-landing aircraft can transition between two flight modes: forward flight and near-hover. This study was conducted to improve the transition performance of such vehicles. The experimental model consists of a rigid Zimmerman wing and a propulsion system with contra-rotating propellers. It was rapidly pitched about its aerodynamic center at an average freestream Reynolds number of 86,000. Five nondimensional pitching rates were used, along with two elevator deflections and three propulsive settings. The model was tested statically, and several observations were made. At constant throttle setting, from 20 to 70 deg, both advance ratio and thrust coefficient increase linearly with angle of attack. Higher throttle setting results in greater stall delay, causing the maximum lift coefficient to increase. When throttle setting increases, lift and drag coefficients increase throughout the tested angle-of-attack domain. Rapid-pitching tests showed that nose-up pitching delays stall and nose-down pitching hastens it. Lift and drag coefficients generally increase with positive pitching rate and decrease with negative pitching rate. Wing aerodynamic efficiency is virtually independent of throttle setting, elevator deflection, and pitching rate between 30 and 70 deg angle of attack. The propulsion system is not sensitive to rapid pitching with regard to thrust, normal force, or propulsive moment.
C1 [Randall, Ryan; Shkarayev, Sergey] Univ Arizona, Dept Aerosp & Mech Engn, Tucson, AZ 85721 USA.
[Babcock, Judson] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
RP Randall, R (reprint author), Univ Arizona, Dept Aerosp & Mech Engn, 1130 N Mt Ave, Tucson, AZ 85721 USA.
EM rrandall@email.arizona.edu; svs@email.arizona.edu;
Gregg.Abate@eglin.af.mil
NR 21
TC 2
Z9 2
U1 1
U2 3
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0021-8669
J9 J AIRCRAFT
JI J. Aircr.
PD MAR-APR
PY 2012
VL 49
IS 2
BP 453
EP 471
DI 10.2514/1.C031378
PG 19
WC Engineering, Aerospace
SC Engineering
GA 925JV
UT WOS:000302758400012
ER
PT J
AU Chakravarty, UK
AF Chakravarty, Uttam Kumar
TI Vibration Characteristics of the Wings of Micro Air Vehicles
SO JOURNAL OF AIRCRAFT
LA English
DT Article
ID HOVERING INSECT FLIGHT; NATURAL FREQUENCIES; DRAGONFLY WINGS;
MODAL-ANALYSIS; AERODYNAMICS; MORPHOLOGY; KINEMATICS; FORCES
AB A finite-element model is developed for the vibration characteristics (natural frequencies and mode shapes) of the biologically inspired wings of micro air vehicles. The wings are known as the composite wing, batten-reinforced composite-polyester-fabric (BRCPF) wing and the perimeter-reinforced composite-polyester-fabric (PRCPF) wing. The wings are constructed by attaching the skin of polyester fabric to the reinforced structures of graphite-epoxy (T300-5208), except for the composite wing, which does not have the skin. The effect of added mass, damping, and aerodynamic pressure on the vibration characteristics of the wings is investigated. The wings are vibrated in vacuum and in air for investigating the effect of added mass and damping on their vibration characteristics. Natural frequencies of the wings increase with mode; however, they decrease in air from those in vacuum due to the added mass of surrounding air. Damping is low and has minimal influence on the natural frequencies of the wings but helps to reduce the out-of-plane modal amplitude of vibration. The composite wing has the highest natural frequencies among the three wings. On the other hand, the natural frequencies of the BRCPF wing are higher than those of the PRCPF wing. Aerodynamic pressure is estimated from the low-speed wind-tunnel test data, where the angle of attack of the wings and freestream velocity of air are varied. The effect of aerodynamic pressure on the first and second natural frequencies of the wings is not significant, although the third natural frequencies of the wings increase with aerodynamic pressure.
C1 USAF, Res Lab, Natl Res Council, Munit Directorate, Eglin AFB, FL 32579 USA.
RP Chakravarty, UK (reprint author), USAF, Res Lab, Natl Res Council, Munit Directorate, Eglin AFB, FL 32579 USA.
EM uttamk@gatech.edu
FU U.S. Air Force Research Laboratory
FX This research was performed while the author held a National Research
Council Research Associateship Award at the U.S. Air Force Research
Laboratory.
NR 31
TC 0
Z9 0
U1 0
U2 11
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0021-8669
J9 J AIRCRAFT
JI J. Aircr.
PD MAR-APR
PY 2012
VL 49
IS 2
BP 644
EP 650
DI 10.2514/1.C031649
PG 7
WC Engineering, Aerospace
SC Engineering
GA 925JV
UT WOS:000302758400029
ER
PT J
AU Chakravarty, UK
Albertani, R
AF Chakravarty, Uttam Kumar
Albertani, Roberto
TI Experimental and Finite Element Modal Analysis of a Pliant Elastic
Membrane for Micro Air Vehicles Applications
SO JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
LA English
DT Article
DE micro air vehicle (MAV); membrane; eigenvalue; eigenvector; damping
ratio
ID DEFORMATION MEASUREMENTS; ADDED-MASS; FLUID; MODEL
AB This paper investigates the modal characteristics of a latex membrane for micro air vehicles applications. Finite element (FE) models are developed for characterizing the latex membrane at dynamic loading and validated by experimental results. The membrane at different pre-tension levels is attached to a circular steel ring, mounted on a shaker, and placed inside the vacuum chamber for modal characterization using a scanning laser Doppler vibrometer (LDV). The experimental modal analysis is conducted by imposing a structural excitation to the ring for investigating the membrane vibration characteristics at both atmospheric and reduced pressures in a vacuum chamber. FE models are developed for the natural frequencies of the membrane at different uniform and non-uniform pre-tension levels with the effect of the added mass of air. The Mooney-Rivlin hyperelastic material model is selected for the membrane. The natural frequencies of the membrane computed by experimental and FE models are correlated well, although discrepancy is expected among experimental and FE results within reasonable limits due to the variation of the thickness of the membrane. The natural frequencies increase with the mode and pre-tension level of the membrane but decrease due to an increase in ambient pressure. The damping ratios have very minimal effect on the frequencies due to low values but help to reduce the amplitude of vibration. Natural frequencies of the membrane do not change with the uniform and non-uniform nature of the pre-tension, although they increase with the pre-tension level. It is also found that the effect of added mass on the natural frequencies increases with an increase of the size of the membrane specimen. [DOI: 10.1115/1.4005569]
C1 [Chakravarty, Uttam Kumar] Georgia Inst Technol, Sch Aerosp Engn, Atlanta, GA 30332 USA.
[Albertani, Roberto] Univ Florida, Dept Mech & Aerosp Engn, Res & Engn Educ Facil, Shalimar, FL 32579 USA.
RP Chakravarty, UK (reprint author), USAF, Res Lab, Eglin AFB, FL 32579 USA.
EM uttamk@gatech.edu
FU U.S. Air Force Office of Scientific Research [FA9550-09-1-0072]; Georgia
Institute of Technology.; U.S. Air Force Research Laboratories at Eglin
AFB; Wright-Patterson AFB
FX The authors would like to thank the support from the U.S. Air Force
Office of Scientific Research under Contract No. FA9550-09-1-0072 with
Professor Victor Giurgiutiu (initiator) and Dr. David Stargel as project
monitors. The continuing support for research activities from the U.S.
Air Force Research Laboratories at Eglin AFB and Wright-Patterson AFB is
also greatly appreciated. The authors would also like to thank the
experimental support of Joshua Martin. The authors also appreciate the
support of Professor Mark Costello of the Georgia Institute of
Technology.
NR 24
TC 2
Z9 2
U1 0
U2 7
PU ASME-AMER SOC MECHANICAL ENG
PI NEW YORK
PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0021-8936
J9 J APPL MECH-T ASME
JI J. Appl. Mech.-Trans. ASME
PD MAR
PY 2012
VL 79
IS 2
AR 021004
DI 10.1115/1.4005569
PG 6
WC Mechanics
SC Mechanics
GA 922WU
UT WOS:000302580000004
ER
PT J
AU Jumper, GY
Holladay, JJ
Wiechert, MK
Seggel, WA
AF Jumper, George Y.
Holladay, Joshua J.
Wiechert, Melissa K.
Seggel, William A.
TI Impact of Thrust Alignment on Orbital Debris Removal by Ground-Based
Lasers
SO JOURNAL OF SPACECRAFT AND ROCKETS
LA English
DT Article
AB The rising population of orbital debris has generated many studies of mitigation concepts, one of which is the use of repetitively pulsed ground-based lasers, which was studied during the ORION project in the early 1990s. The objective was to verify the minimum velocity change required to cause a reentry within one orbit, using conservative assumptions. Both analytical and numerical solutions to the equations of motion were applied. The report covers the impact if the orbital debris does not make a direct pass over the laser. Also reported are investigations of the impact or object size and density, and the impact of atmospheric density on the velocity change required to deorbit. The conclusion is that, with some minor exceptions, the ORION required velocity change results appear to be reasonable for concept studies for direct overhead passes. Debris at nonoverhead offset angles of 30 increases total velocity change by about 15%, but increases the velocity change per laser pulse by over 30% above requirements for an overhead pass. Allowing laser pulses to continue until the object is overhead or at closest approach increases total energy requirements but lowers the energy per pulse, an important design consideration.
C1 [Jumper, George Y.; Seggel, William A.] USAF, Res Lab, Space Vehicles Directorate, Hanscom AFB, MA 01731 USA.
RP Jumper, GY (reprint author), USAF, Res Lab, Space Vehicles Directorate, Hanscom AFB, MA 01731 USA.
FU U.S. Air Force Research Laboratory, Space Vehicles Directorate
FX The authors would like to acknowledge the support of the U.S. Air Force
Research Laboratory, Space Vehicles Directorate, Space Scholar Program
and its manager, T. A. Lovell. We thank our Program Manager, Major
Parker, Branch Technical Advisor J. Roadcap, and Branch Chief, Major
Thompson. We thank J. Wise for assistance with atmospheric density.
Finally, we appreciate the support and advice of the Directorate Chief
Scientist, J. Riker.
NR 8
TC 0
Z9 0
U1 0
U2 4
PU AMER INST AERONAUTICS ASTRONAUTICS
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0022-4650
EI 1533-6794
J9 J SPACECRAFT ROCKETS
JI J. Spacecr. Rockets
PD MAR-APR
PY 2012
VL 49
IS 2
BP 261
EP 267
DI 10.2514/1.A32059
PG 7
WC Engineering, Aerospace
SC Engineering
GA 925KM
UT WOS:000302760100008
ER
PT J
AU Langley, D
Coutu, RA
Collins, PJ
AF Langley, Derrick
Coutu, Ronald A., Jr.
Collins, Peter J.
TI Low-loss meta-atom for improved resonance response
SO AIP ADVANCES
LA English
DT Article
AB Measurements of a meta-atom integrated with a low noise amplifier into the split-ring resonator are presented. A comparison is made between baseline meta-atoms and one integrated with a GaAs low noise amplifier. S-parameter measurements in a RF strip-line show the resonant frequency location. The resonance null is more prominent for the integrated meta-atom. Biasing the low noise amplifier from 0 to 7 VDC showed that the resonant null improved with biasing voltage. As the biasing voltage increases, the transmission null reduced from -11.82 to -23.21 dB for biases from 0 to 7 VDC at resonant frequency. This is a work of the U. S. Government and is not subject to copyright protection in the United States. [http://dx.doi.org/10.1063/1.3701709]
C1 [Langley, Derrick; Coutu, Ronald A., Jr.; Collins, Peter J.] USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Langley, D (reprint author), USAF, Dept Elect & Comp Engn, Inst Technol, 2950 Hobson Way,Bldg 641, Wright Patterson AFB, OH 45433 USA.
EM Derrick.Langley@afit.edu
RI Coutu, Ronald/I-7711-2014
FU Air Force Research Laboratory (AFRL), Materials and Manufacturing
Directorate
FX The financial support and sponsorship of this project were provided by
Drs. Katie Thorp and Augustine Urbas from the Air Force Research
Laboratory (AFRL), Materials and Manufacturing Directorate. The authors
are also thankful to Ryan O'Hara for advice on printed circuit board
layouts as well as AFIT clean room support from Rick Patton and Rich
Johnston.
NR 18
TC 0
Z9 0
U1 0
U2 6
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 2158-3226
J9 AIP ADV
JI AIP Adv.
PD MAR
PY 2012
VL 2
IS 1
AR 012196
DI 10.1063/1.3701709
PG 5
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Physics, Applied
SC Science & Technology - Other Topics; Materials Science; Physics
GA 918CA
UT WOS:000302225400114
ER
PT J
AU Liu, YT
Fard, MY
Chattopadhyay, A
Doyle, D
AF Liu, Yingtao
Fard, Masoud Yekani
Chattopadhyay, Aditi
Doyle, Derek
TI Damage assessment of CFRP composites using a time-frequency approach
SO JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
LA English
DT Article
DE delamination; localization; quantification; matching pursuit
decomposition
ID PIEZOELECTRIC SENSOR/ACTUATOR NETWORK; IDENTIFICATION; LOCALIZATION;
PROGNOSIS; PLATE; WAVES; PANEL
AB A damage assessment methodology using a time-frequency signal processing technique is presented in this article. Delaminations are detected in composite structures with multiple stiffeners. Because Lamb waves are complex in nature, due to wave dispersion and scattering, a robust signal processing technique is required to extract features from Lamb wave signals. In this article, the matching pursuit decomposition algorithm is used for extracting wavelets from the Lamb wave signals in the time-frequency domain. A small time-frequency atom dictionary is defined to avoid the exhaustive search over the time-frequency domain and to reduce the computation costs. The propagation characteristics of Lamb waves in stiffened composite panels are investigated. The delaminations are detected by identifying the converted Lamb wave modes introduced by the structural imperfection. A two-step damage detection approach, which uses both pulse-echo and pitch-catch active sensing schemes, is developed for the identification of delaminations. The delamination is quantified using a signal energy-based damage index. The matching pursuit decomposition algorithm is further used to localize the delamination position by solving a set of nonlinear equations. The results show that the matching pursuit decomposition algorithm can be used to identify and localize the seeded delaminations in composite structures with complex geometries and material properties.
C1 [Liu, Yingtao; Fard, Masoud Yekani; Chattopadhyay, Aditi] Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA.
[Doyle, Derek] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM USA.
RP Liu, YT (reprint author), Arizona State Univ, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA.
EM yingtao.liu@asu.edu
RI Liu, Yingtao/J-2454-2012; Liu, Yingtao/H-7375-2015
FU Army Research Laboratory [FA9453-09-1-0316]
FX This material is based on research sponsored by the Army Research
Laboratory and managed by the Air Force Research Laboratory/Space
Vehicles Directorate under agreement number FA9453-09-1-0316. The US
government is authorized to reproduce and distribute reprints for
governmental purposes notwithstanding any copyright notation thereon.
The views and conclusions contained herein are those of the authors and
should not be interpreted as necessarily representing the official
policies or endorsements, either expressed or implied, of Army Research
Laboratory, Air Force Research Laboratory, or the US government.
NR 33
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PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 1045-389X
J9 J INTEL MAT SYST STR
JI J. Intell. Mater. Syst. Struct.
PD MAR
PY 2012
VL 23
IS 4
BP 397
EP 413
DI 10.1177/1045389X11434171
PG 17
WC Materials Science, Multidisciplinary
SC Materials Science
GA 918KS
UT WOS:000302249000002
ER
PT J
AU Arritt, BJ
Smith, DR
Khraishi, TA
AF Arritt, Brandon J.
Smith, David R.
Khraishi, Tariq A.
TI Analytically describing the temperature-dependent constitutive
parameters of an electromagnetic metamaterial
SO JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
LA English
DT Article
DE metamaterial; electromagnetic; multifunctional; temperature-dependence;
effective medium; composite structure
ID LOW-FREQUENCY PLASMONS; MICROWAVE-FREQUENCIES; PERMITTIVITY; RESONATORS;
CLOAK; RING
AB Analogous to mechanical systems, modeling the electromagnetic (EM) performance of large and complex metamaterial structures requires the use of effective-medium/constitutive properties. Constitutive properties are critical for efficiently bridging the gap between subwavelength geometry and performance at the mesoscale. In this article, the temperature-dependent effective medium properties for a metamaterial electric-inductive-capacitive (ELC) resonator are described analytically. ELC structures are commonly used in metamaterial designs to provide a tailored electric response to EM waves. An equivalent circuit model, coupled with analytic expressions for the capacitances, inductance, and resistance of the ELC resonator, is utilized to describe how thermally induced mechanical strain and changes in material properties manifest as temperature-dependent permittivity and permeability curves for the metamaterial. The resulting analytic expressions account for the effects of spatial dispersion and losses. This article also details how the process may be expanded to similarly describe the temperature-dependent constitutive properties of metamaterial magnetic resonators.
C1 [Arritt, Brandon J.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Smith, David R.] Duke Univ, Ctr Metamat & Integrated Plasmon, Dept Elect & Comp Engn, Durham, NC USA.
[Khraishi, Tariq A.] Univ New Mexico, Dept Mech Engn, Albuquerque, NM 87131 USA.
RP Arritt, BJ (reprint author), USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
EM afrl.rvsv@kirtland.af.mil
RI Smith, David/E-4710-2012
FU AFOSR LRIR [12RV01COR]
FX This research was funded in part by AFOSR LRIR 12RV01COR.
NR 29
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U1 1
U2 12
PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 1045-389X
EI 1530-8138
J9 J INTEL MAT SYST STR
JI J. Intell. Mater. Syst. Struct.
PD MAR
PY 2012
VL 23
IS 4
BP 463
EP 471
DI 10.1177/1045389X11433496
PG 9
WC Materials Science, Multidisciplinary
SC Materials Science
GA 918KS
UT WOS:000302249000007
ER
PT J
AU Lin, CA
Huang, ML
Chiu, PC
Lin, HK
Chyi, JI
Chiang, TH
Lee, WC
Chang, YC
Chang, YH
Brown, GJ
Kwo, J
Hong, M
AF Lin, C. A.
Huang, M. L.
Chiu, P. -C.
Lin, H. -K.
Chyi, J. -I.
Chiang, T. H.
Lee, W. C.
Chang, Y. C.
Chang, Y. H.
Brown, G. J.
Kwo, J.
Hong, M.
TI InAs MOS devices passivated with molecular beam epitaxy-grown Gd2O3
dielectrics
SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
LA English
DT Article
ID INTERFACE
AB InAs MOS devices passivated with molecular beam epitaxy (MBE)-grown Gd2O3 2-3 monolayers thick followed by an Al2O3 cap have demonstrated excellent electrical performances and interfacial properties. Band offset energies of in situ atomic-layer-deposited (ALD)-Al2O3/MBE-Gd2O3/InAs and ALD-Al2O3/InAs were determined by in situ x-ray photoelectron spectroscopy in conjunction with Fowler-Nordheim tunneling current analysis. A conduction-band offset energy (Delta E-c) and a valence-band offset energy of 2.3 and 3.92 eV for ALD-Al2O3/InAs were determined, respectively. The insertion of a Gd2O3 layer increases the value of Delta E-c by nearly 0.1 eV as compared to the case for Al2O3 directly deposited on InAs. The distribution of interfacial density of states (D-it) within the InAs bandgap, deduced by the conductance method at 77 K, gives a low D-it value of 10(12) cm(-2) eV(-1) near the conduction-band edge. Moreover, with energy band engineering in the heterostructure, gate-first depletion channel InAs MOSFETs have produced drain current density of 46 mu A/mu m and transconductance of 17 mu S/mu m for 12-mu m-gate-length devices at 300 K. (C) 2012 American Vacuum Society. [DOI:10.1116/1.3678206]
C1 [Chiu, P. -C.; Lin, H. -K.; Chyi, J. -I.] Natl Cent Univ, Dept Elect Engn, Jhongli 32001, Taiwan.
[Lin, C. A.; Huang, M. L.; Kwo, J.] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan.
[Chiang, T. H.; Lee, W. C.; Chang, Y. C.; Chang, Y. H.] Natl Tsing Hua Univ, Dept Mat Sci & Engn, Hsinchu 30013, Taiwan.
[Brown, G. J.] AFRL, Dayton, OH 45433 USA.
[Kwo, J.] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei 10617, Taiwan.
[Hong, M.] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan.
[Hong, M.] Natl Taiwan Univ, Grad Inst Appl Phys, Taipei 10617, Taiwan.
RP Chyi, JI (reprint author), Natl Cent Univ, Dept Elect Engn, Jhongli 32001, Taiwan.
EM chyi@ee.ncu.edu.tw; raynien@ntu.edu.tw
FU National Science Council, Taiwan [NSC-98-2120-M-007-002,
NSC-97-3114-M-007-001]; Asian Office of Aerospace Research and
Development of the U.S. Air Force
FX The authors thank the National Science Council, Taiwan for supporting
this work under Grant Nos. NSC-98-2120-M-007-002 and
NSC-97-3114-M-007-001. The support from the Asian Office of Aerospace
Research and Development of the U.S. Air Force is acknowledged.
NR 17
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U2 10
PU A V S AMER INST PHYSICS
PI MELVILLE
PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
SN 1071-1023
J9 J VAC SCI TECHNOL B
JI J. Vac. Sci. Technol. B
PD MAR
PY 2012
VL 30
IS 2
AR 02B118
DI 10.1116/1.3678206
PG 4
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology;
Physics, Applied
SC Engineering; Science & Technology - Other Topics; Physics
GA 917ZV
UT WOS:000302219500018
ER
PT J
AU Steenbergen, EH
Nunna, K
Ouyang, L
Ullrich, B
Huffaker, DL
Smith, DJ
Zhang, YH
AF Steenbergen, Elizabeth H.
Nunna, Kalyan
Ouyang, Lu
Ullrich, Bruno
Huffaker, Diana L.
Smith, David J.
Zhang, Yong-Hang
TI Strain-balanced InAs/InAs1-xSbx type-II superlattices grown by molecular
beam epitaxy on GaSb substrates
SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
LA English
DT Article
ID LAYER SUPERLATTICES; MU-M; ALLOYS
AB Strain-balanced InAs/InAs1-xSbx type-II superlattices (SLs) on GaSb substrates with 0.27 <= x <= 0.33 were grown by molecular beam epitaxy and demonstrated photoluminescence (PL) up to 11.1 mu m. The calculated SL bandgap energies agree with the PL peaks to within 5 meV for long-wavelength infrared samples (9.5, 9.9, and 11.1 mu m) and to within 9 meV for a mid-wavelength infrared sample (5.9 mu m). X-ray diffraction measurements reveal average SL mismatches of less than 0.2%, and the PL full-width-at-half-maximums increase with the mismatch, confirming the importance of strain-balancing for material quality. (C) 2012 American Vacuum Society. [DOI:10.1116/1.3672028]
C1 [Steenbergen, Elizabeth H.; Smith, David J.; Zhang, Yong-Hang] Arizona State Univ, Ctr Photon Innovat, Tempe, AZ 85287 USA.
[Steenbergen, Elizabeth H.; Zhang, Yong-Hang] Arizona State Univ, Sch Elect Comp & Energy Engn, Tempe, AZ 85287 USA.
[Nunna, Kalyan; Huffaker, Diana L.] Univ Calif Los Angeles, Calif NanoSyst Inst, Los Angeles, CA 90095 USA.
[Ouyang, Lu; Smith, David J.] Arizona State Univ, Dept Phys, Tempe, AZ 85287 USA.
[Ullrich, Bruno] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Zhang, YH (reprint author), Arizona State Univ, Ctr Photon Innovat, Tempe, AZ 85287 USA.
EM yhzhang@asu.edu
FU U. S. Army Research Laboratory; U. S. Army Research Office MURI
[W911NF-10-1-0524]; Air Force Office of Scientific Research
[FA9550-10-1-0129]; DOD SMART; SFAz scholarship; ASU Office of the
Vice-President for Research and Economic Affairs; Graduate Research
Support Program; Graduate College
FX This paper is based upon work supported in part by the U. S. Army
Research Laboratory and the U. S. Army Research Office MURI program
under Grant No. W911NF-10-1-0524 and Air Force Office of Scientific
Research Grant No. (FA9550-10-1-0129). PL experiments were performed at
AFRL/RXPS with the support of G. Brown. E.H.S. appreciates the DOD SMART
and SFAz scholarships and acknowledges the ASU Office of the
Vice-President for Research and Economic Affairs, the Graduate Research
Support Program, and the Graduate College.
NR 25
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U1 0
U2 12
PU A V S AMER INST PHYSICS
PI MELVILLE
PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
SN 1071-1023
J9 J VAC SCI TECHNOL B
JI J. Vac. Sci. Technol. B
PD MAR
PY 2012
VL 30
IS 2
AR 02B107
DI 10.1116/1.3672028
PG 5
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology;
Physics, Applied
SC Engineering; Science & Technology - Other Topics; Physics
GA 917ZV
UT WOS:000302219500007
ER
PT J
AU McConney, ME
Kulkarni, DD
Jiang, H
Bunning, TJ
Tsukruk, VV
AF McConney, Michael E.
Kulkarni, Dhaval D.
Jiang, Hao
Bunning, Timothy J.
Tsukruk, Vladimir V.
TI A New Twist on Scanning Thermal Microscopy
SO NANO LETTERS
LA English
DT Article
DE Scanning thermal microscopy; scanning thermal twisting microscopy;
thermal transport; nanoscale thermometry; thermal bimorph
ID MICROCANTILEVERS; MECHANISMS; PROBES
AB The thermal bimorph is a very popular thermal sensing mechanism used in various applications from meat thermometers to uncooled infrared cameras. While thermal bimorphs have remained promising for scanning thermal microscopy, unfortunately the bending of the bimorph directly interferes with the bending associated with topographical information. We circumvent this issue by creating bimorphs that twist instead of bending and demonstrate the superior properties of this approach as compared to conventional scanning thermal microscopy.
C1 [McConney, Michael E.; Jiang, Hao; Bunning, Timothy J.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[McConney, Michael E.; Kulkarni, Dhaval D.; Tsukruk, Vladimir V.] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.
RP McConney, ME (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM michael.mcconney@wpafb.af.mil
RI McConney, Michael/A-1680-2011
FU National Research Council at Air Force Research Laboratory;
Semiconductor Research Corporation (GRC) [2008OJ1864.1281]; Air Force
Office of Scientific Research [FA9550-08-1-0446, FA9550-09-1-0162]
FX The authors would like to thank Rachel Jakubiak, Shane Juhl, Scott Apt,
David Tomlin, Vincent Tondiglia, Lirong Sun, Maneesh Gupta, Abigail
Juhl, and Michael Birnkrant for their help. We would also like to thank
Professor Srikanth Singamaneni and Kyle Anderson for useful discussions.
M.M. recognizes the support of the National Research Council Research
Associate Program at Air Force Research Laboratory throughout this work.
The work at Georgia Tech was supported by the Semiconductor Research
Corporation (GRC Grant 2008OJ1864.1281) and Air Force Office of
Scientific Research (Grant FA9550-08-1-0446 and FA9550-09-1-0162).
NR 28
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U1 0
U2 19
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1530-6984
EI 1530-6992
J9 NANO LETT
JI Nano Lett.
PD MAR
PY 2012
VL 12
IS 3
BP 1218
EP 1223
DI 10.1021/nl203531f
PG 6
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 907GW
UT WOS:000301406800017
PM 22276740
ER
PT J
AU Mannoor, MS
Tao, H
Clayton, JD
Sengupta, A
Kaplan, DL
Naik, RR
Verma, N
Omenetto, FG
McAlpine, MC
AF Mannoor, Manu S.
Tao, Hu
Clayton, Jefferson D.
Sengupta, Amartya
Kaplan, David L.
Naik, Rajesh R.
Verma, Naveen
Omenetto, Fiorenzo G.
McAlpine, Michael C.
TI Graphene-based wireless bacteria detection on tooth enamel
SO NATURE COMMUNICATIONS
LA English
DT Article
ID HELICOBACTER-PYLORI; ANTIMICROBIAL PEPTIDES; ELECTRICAL DETECTION;
MONOLAYER GRAPHENE; SENSORS; BIOSENSORS; DESIGN; DNA; FUNCTIONALIZATION;
ELECTRONICS
AB Direct interfacing of nanosensors onto biomaterials could impact health quality monitoring and adaptive threat detection. Graphene is capable of highly sensitive analyte detection due to its nanoscale nature. Here we show that graphene can be printed onto water-soluble silk. This in turn permits intimate biotransfer of graphene nanosensors onto biomaterials, including tooth enamel. The result is a fully biointerfaced sensing platform, which can be tuned to detect target analytes. For example, via self-assembly of antimicrobial peptides onto graphene, we show bioselective detection of bacteria at single-cell levels. Incorporation of a resonant coil eliminates the need for onboard power and external connections. Combining these elements yields two-tiered interfacing of peptide-graphene nanosensors with biomaterials. In particular, we demonstrate integration onto a tooth for remote monitoring of respiration and bacteria detection in saliva. Overall, this strategy of interfacing graphene nanosensors with biomaterials represents a versatile approach for ubiquitous detection of biochemical targets.
C1 [Mannoor, Manu S.; Clayton, Jefferson D.; McAlpine, Michael C.] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA.
[Tao, Hu; Kaplan, David L.; Omenetto, Fiorenzo G.] Tufts Univ, Dept Biomed Engn, Medford, MA 02155 USA.
[Sengupta, Amartya] Princeton Univ, Dept Geosci, Princeton, NJ 08544 USA.
[Naik, Rajesh R.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Verma, Naveen] Princeton Univ, Dept Elect Engn, Princeton, NJ 08544 USA.
RP McAlpine, MC (reprint author), Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA.
EM mcm@princeton.edu
RI Tao, Hu/C-1528-2013; Sengupta, Amartya/E-2111-2013
OI Sengupta, Amartya/0000-0002-0195-9171
FU Air Force Office of Scientific Research [FA9550-09-1-0096]; American
Asthma Foundation [09-0038]
FX We thank Dr. Yue Cui, Dr. Yi Qi and Fadi Abdeljawad for valuable
discussions and technical assistance. M. C. M. acknowledges support of
this work by the Air Force Office of Scientific Research via a Young
Investigator Award (#FA9550-09-1-0096) and by the American Asthma
Foundation via an Early Excellence Award (#09-0038). R.R.N. acknowledges
funding support from the Air Force Office of Scientific Research.
NR 60
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U1 37
U2 283
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 2041-1723
J9 NAT COMMUN
JI Nat. Commun.
PD MAR
PY 2012
VL 3
AR 763
DI 10.1038/ncomms1767
PG 8
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 923PB
UT WOS:000302630100052
PM 22453836
ER
PT J
AU Bostick, RL
Perram, GP
AF Bostick, Randall L.
Perram, Glen P.
TI Spatial and spectral performance of a chromotomosynthetic hyperspectral
imaging system
SO REVIEW OF SCIENTIFIC INSTRUMENTS
LA English
DT Article
ID SPECTROMETER; TOMOSYNTHESIS; RECONSTRUCTION; IMAGES
AB The spatial and spectral resolutions achievable by a prototype rotating prism chromotomosynthetic imaging (CTI) system operating in the visible spectrum are described. The instrument creates hyperspectral imagery by collecting a set of 2D images with each spectrally projected at a different rotation angle of the prism. Mathematical reconstruction techniques that have been well tested in the field of medical physics are used to reconstruct the data to produce the 3D hyperspectral image. The instrument operates with a 100 mm focusing lens in the spectral range of 400-900 nm with a field of view of 71.6 mrad and angular resolution of 0.8-1.6 mu rad. The spectral resolution is 0.6 nm at the shortest wavelengths, degrading to over 10 nm at the longest wavelengths. Measurements using a point-like target show that performance is limited by chromatic aberration. The system model is slightly inaccurate due to poor estimation of detector spatial resolution, this is corrected based on results improving model performance. As with traditional dispersion technology, calibration of the transformed wavelength axis is required, though with this technology calibration improves both spectral and spatial resolution. While this prototype does not operate at high speeds, components exist which will allow for CTI systems to generate hyperspectral video imagery at rates greater than 100 Hz. [http://dx.doi.org/10.1063/1.3697720]
C1 [Bostick, Randall L.; Perram, Glen P.] USAF, Dept Engn Phys, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Perram, GP (reprint author), USAF, Dept Engn Phys, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM randall.bostick2@wpafb.af.mil
OI Perram, Glen/0000-0002-4417-3929
NR 27
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U1 1
U2 14
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0034-6748
EI 1089-7623
J9 REV SCI INSTRUM
JI Rev. Sci. Instrum.
PD MAR
PY 2012
VL 83
IS 3
AR 033110
DI 10.1063/1.3697720
PG 7
WC Instruments & Instrumentation; Physics, Applied
SC Instruments & Instrumentation; Physics
GA 918CU
UT WOS:000302227700011
PM 22462909
ER
PT J
AU Fillery, SP
Koerner, H
Drummy, L
Dunkerley, E
Durstock, MF
Schmidt, DF
Vaia, RA
AF Fillery, Scott P.
Koerner, Hilmar
Drummy, Lawrence
Dunkerley, Erik
Durstock, Michael F.
Schmidt, Daniel F.
Vaia, Richard A.
TI Nanolaminates: Increasing Dielectric Breakdown Strength of Composites
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE dielectric nanocomposite; nanolaminate; layered silicate; permittivity;
dielectric breakdown; energy storage
ID POLYMER COMPOSITE; ENERGY-STORAGE; NANOCOMPOSITES; NANOPARTICLES;
NANODIELECTRICS; DENSITY; FILM
AB Processable, low-cost, high-performance hybrid dielectrics are enablers for a vast array of green technologies, including high-temperature electrical insulation and pulsed power capacitors for all-electric transportation vehicles. Maximizing the dielectric breakdown field (E-BD), in conjunction with minimization of leakage current, directly impacts system performance because of the field's quadratic relationship with electrostatic energy storage density. On the basis of the extreme internal interfacial area and ultrafine morphology, polymer-inorganic nanocomposites (PNCs) have demonstrated modest increases in E-BD at very low inorganic loadings, but because of insufficient control of the hierarchal morphology of the blend, have yielded a precipitous decline in E-BD at intermediate and high inorganic volume fractions. Here in, we demonstrate that E-BD can be increased up to these intermediate inorganic volume fractions by creating uniform one-dimensional nanocomposites (nanolaminates) rather than blends of spherical inorganic nanoparticles and polymers. Free standing nanolaminates of highly aligned and dispersed montmorillonite in polyvinyl butyral exhibited enhancements in E-BD up to 30 vol % inorganic (70 wt % organically modified montmorillonite). These relative enhancements extend up to five times the inorganic fraction observed for random nanoparticle dispersions, and are anywhere from two to four times greater than observed at comparable volume fraction of nanoparticles. The breakdown characteristics of this model system suggested a trade-off between increased path tortuosity and polymer-deficient structural defects. This implies that an idealized PNC morphology to retard the breakdown cascade perpendicular to the electrodes will occur at intermediate volume fractions and resemble a discotic nematic phase where highly aligned, high-aspect ratio nanometer thick plates are uniformly surrounded by nanoscopic regions of polymer.
C1 [Fillery, Scott P.; Durstock, Michael F.; Vaia, Richard A.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Koerner, Hilmar; Drummy, Lawrence] UES, Dayton, OH USA.
[Dunkerley, Erik; Schmidt, Daniel F.] Univ Massachusetts, Dept Plast Engn, Lowell, MA USA.
[Fillery, Scott P.] CNR, Washington, DC 20418 USA.
RP Vaia, RA (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Richard.Vaia@wpafb.af.mil
OI Schmidt, Daniel/0000-0003-2511-1906
FU Air Force Office of Scientific Research; Air Force Research Laboratory
Materials & Manufacturing Directorate
FX The authors are grateful to the Air Force Office of Scientific Research
and Air Force Research Laboratory Materials & Manufacturing Directorate
for financial support and acknowledge G. Price, M. Houtz, and V. McNeir
for help with SEM, TGA/DSC, and high voltage electrical
characterization.
NR 50
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U1 5
U2 107
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD MAR
PY 2012
VL 4
IS 3
BP 1388
EP 1396
DI 10.1021/am201650g
PG 9
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 914RD
UT WOS:000301968400035
PM 22301841
ER
PT J
AU Dickerson, MB
Lyon, W
Gruner, WE
Mirau, PA
Slocik, JM
Naik, RR
AF Dickerson, Matthew B.
Lyon, Wanda
Gruner, William E.
Mirau, Peter A.
Slocik, Joseph M.
Naik, Rajesh R.
TI Sporicidal/Bactericidal Textiles via the Chlorination of Silk
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE silk; halamine; sporicidal; Bacillus anthracis; antibacterial; fibroin
ID HALAMINE POLYMERIC BIOCIDES; BOMBYX-MORI SILK; ANTIMICROBIAL SILVER
NANOPARTICLES; HYPOCHLORITE-INDUCED OXIDATION; HYDANTOIN-CONTAINING
MONOMERS; NITROGEN-CENTERED RADICALS; BACILLUS-SUBTILIS; FIBROUS
MATERIALS; PROTEIN FRAGMENTATION; MELAMINE DERIVATIVES
AB Bacterial spores, such as those of the Bacillus genus, are extremely resilient, being able to germinate into metabolically active cells after withstanding harsh environmental conditions or aggressive chemical treatments. The toughness of the bacterial spore in combination with the use of spores, such as those of Bacillus anthracis, as a biological warfare agent necessitates the development of new antimicrobial textiles. In this work, a route to the production of fabrics that kill bacterial spores and cells within minutes of exposure is described. Utilizing this facile process, unmodified silk cloth is reacted with a diluted bleach solution, rinsed with water, and dried. The chlorination of silk was explored under basic (pH 11) and slightly acidic (pH 5) conditions. Chloramine-silk textiles prepared in acidified bleach solutions were found to have superior breaking strength and higher oxidative Cl contents than those prepared under caustic conditions. Silk cloth chlorinated for >= 1 h at pH 5 was determined to induce > 99.99996% reduction in the colony forming units of Escherichia coli, as well as Bacillus thuringiensis Al Hakam (B. anthracis simulant) spores and cells within 10 min of contact. The processing conditions presented for silk fabric in this study are highly expeditionary, allowing for the on-site production of protein-based antimicrobial materials from a variety of agriculturally produced feed-stocks.
C1 [Dickerson, Matthew B.; Mirau, Peter A.; Slocik, Joseph M.; Naik, Rajesh R.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Lyon, Wanda; Gruner, William E.] USAF, Human Effectiveness Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Naik, RR (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Rajesh.Naik@wpafb.af.mil
FU Defense Threat Reduction Agency [AA06CBT008]; Air Force Office of
Scientific Research
FX This research was supported by the Defense Threat Reduction Agency
(Project AA06CBT008 under program manager Dr. Glenn Lawson) and in part
by the Air Force Office of Scientific Research (program manager Dr. Hugh
DeLong). The authors thank Michelle L. Kay and Caitlin L. Knight for
their assistance in the staining of B. thuringiensis for the TOC image.
This material cleared for public release (88ABW-2012-1049).
NR 79
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U2 32
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD MAR
PY 2012
VL 4
IS 3
BP 1724
EP 1732
DI 10.1021/am2018496
PG 9
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 914RD
UT WOS:000301968400079
PM 22352921
ER
PT J
AU Barua, A
Horie, Y
Zhou, M
AF Barua, A.
Horie, Y.
Zhou, M.
TI Energy localization in HMX-Estane polymer-bonded explosives during
impact loading
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID STRAIN-RATE; MECHANICAL-PROPERTIES; SOLID EXPLOSIVES; HOT-SPOTS;
PBX-9501; TEMPERATURE; DEFORMATION; FRACTURE
AB We report the results of a mechanistic study of energy localization in a HMX (High Melting point eXplosive octahydro-1,3,5,7-tetranitro-1,2,3,5-tetrazocine)/Estane PBX system during dynamic loading. The focus is on the thermal-mechanical response over the strain rate range of 10(4) - 10(5) s(-1) under different confinement conditions. A recently developed cohesive finite element method is used to track and analyze the contributions to heating from different constituents, interfaces, deformation and fracture mechanisms, and internal friction. In particular, energy dissipations due to viscoelastic deformation, grain fracture, interfacial debonding, and friction along crack faces are quantified as functions of time and overall deformation. The materials analyzed have HMX volume fractions between 0.69 and 0.82. Calculations show that variation in strain rate can significantly affect the spatial distribution but not the overall number of hot spots. Higher confining stresses lead to more intense heating in the binder and more uniform distribution of hot spots. The evolution of hot spots is quantified as a function of loading condition, deformation and microstructural attributes. The microstructure-response relations obtained can be used to assess the initiation sensitivity of energetic composites. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3688350]
C1 [Barua, A.; Zhou, M.] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA.
[Horie, Y.] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
RP Zhou, M (reprint author), Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA.
EM min.zhou@me.gatech.edu
FU Air Force Research Laboratory (AFRL) at the Eglin AFB in Florida;
Defense Threat Reduction Agency (DTRA)
FX The authors gratefully acknowledge support from the Air Force Research
Laboratory (AFRL) at the Eglin AFB in Florida and the Defense Threat
Reduction Agency (DTRA) (scientific officer: Dr. Suhithi Peiris).
Calculations are carried out on parallel computers at NAVO and the DPRL
at Georgia Tech.
NR 26
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U1 4
U2 42
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD MAR 1
PY 2012
VL 111
IS 5
AR 054902
DI 10.1063/1.3688350
PG 11
WC Physics, Applied
SC Physics
GA 911OW
UT WOS:000301729200147
ER
PT J
AU Bifano, MFP
Park, J
Kaul, PB
Roy, AK
Prakash, V
AF Bifano, Michael F. P.
Park, Jungkyu
Kaul, Pankaj B.
Roy, Ajit K.
Prakash, Vikas
TI Effects of heat treatment and contact resistance on the thermal
conductivity of individual multiwalled carbon nanotubes using a
Wollaston wire thermal probe
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
ID HYDROGENATED AMORPHOUS-CARBON; 3-OMEGA METHOD; GRAPHITE; DYNAMICS
AB Thermal conductivity measurements in commercially available, chemical vapor deposition-grown, heat-treated and non-heat-treated multiwalled carbon nanotubes (MWCNTs) are reported. The thermal conductivity of individual samples is measured using a suspended platinum wire as a thermal resistance probe in a "T-type" configuration. Changes in third harmonic voltage are measured across the heated suspended platinum wire as a specimen is attached to the platinum wire's midpoint. An analytic model is used to correlate the reduction in the average temperature of the probe wire to the thermal resistance (and thermal conductivity) of the attached sample. Experiments are implemented inside a scanning electron microscope equipped with nanomanipulators for sample selection, and a gas injection system for platinum based electron beam-induced deposition to improve thermal contact resistances. The results indicate a nearly 5-fold increase in the average thermal conductivity of MWCNT samples annealed with a 20-h 3000 degrees C annealing heat treatment compared to the as-grown samples. However, specimen-specific morphological defects, such as kinking, Y-branches, etc., are found to negate, to a large degree, the advantage of the heat treatment process. The thermal contact resistance between the MWCNT and the electron beam-induced deposition contacts is estimated using an anisotropic diffusive mismatch model that includes the effect of fin resistance. Adjusting the thermal conductivity to include the effect of thermal contact resistance is found to increase the thermal conductivity by approximately 5%. Once adjusted for thermal contact resistance, the average thermal conductivity of the heat-treated MWCNT specimens is 228 W/m-K, with the highest measured thermal conductivity being 765 +/- 150 W/m-K. The results highlight the importance of MWCNT quality in thermal management applications. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3691607]
C1 [Bifano, Michael F. P.; Park, Jungkyu; Kaul, Pankaj B.; Prakash, Vikas] Case Western Reserve Univ, Dept Mech & Aerosp Engn, Cleveland, OH 44106 USA.
[Roy, Ajit K.] USAF, Res Lab, Mat & Mfg Directorate, Dayton, OH 45433 USA.
RP Prakash, V (reprint author), Case Western Reserve Univ, Dept Mech & Aerosp Engn, Cleveland, OH 44106 USA.
EM vikas.prakash@case.edu
FU Air Force Office of Scientific Research (AFOSR) [FA9550-08-1-0372]; NSF
Major Research Instrument [NSF MRI CMMI-0922968]; AFOSR MURI
[FA9550-12-1-0037]
FX The authors would like to thank Professor Chris Dames for his extremely
useful discussions on the preparation and execution of the hot wire
probe method, Eric Mayhew for his help troubleshooting the measurement
electronics, and Jonghoon Lee from WPAFB for his helpful discussions on
using MD to obtain phonon dispersion. The authors would also like to
acknowledge the support of the Air Force Office of Scientific Research
(AFOSR) grant FA9550-08-1-0372 (Program Manager: Dr. "Les" Lee), NSF
Major Research Instrument grant NSF MRI CMMI-0922968, and AFOSR MURI
FA9550-12-1-0037 (Program Manager: Dr. Joycelyn Harrison) for conducting
this research.
NR 53
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Z9 15
U1 2
U2 37
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD MAR 1
PY 2012
VL 111
IS 5
AR 054321
DI 10.1063/1.3691607
PG 15
WC Physics, Applied
SC Physics
GA 911OW
UT WOS:000301729200131
ER
PT J
AU Haugan, HJ
Brown, GJ
Elhamri, S
Pacley, S
Olson, BV
Boggess, TF
AF Haugan, H. J.
Brown, G. J.
Elhamri, S.
Pacley, S.
Olson, B. V.
Boggess, T. F.
TI Post growth annealing study on long wavelength infrared InAs/GaSb
superlattices
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Article
AB The impact of post growth annealing on the electrical properties of a long wavelength infrared type-II superlattice (SL) was explored. Quarters of a single SL wafer were annealed at 440 degrees C, 480 degrees C, and 515 degrees C, respectively for 30 min. Changes in the electrical properties were followed using spectral photoconductivity, temperature dependent Hall effect, and time-resolved pump-probe measurements. The bandgap energy remained at similar to 107 meV for each anneal, and the photoresponse spectra showed a 25% improvement. The carrier lifetime increased from 12 to similar to 15 ns with annealing. The electron mobility was nearly constant for the 440 degrees C and 480 degrees C anneals, and increased from similar to 4500 to 6300 cm(2)/Vs for the 515 degrees C anneal. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3693535]
C1 [Haugan, H. J.; Brown, G. J.; Pacley, S.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Elhamri, S.] Univ Dayton, Dept Phys, Dayton, OH 45469 USA.
[Olson, B. V.; Boggess, T. F.] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
RP Haugan, HJ (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM heather.haugan.ctr@us.af.mil
FU Air Force [F33615-03-D-5801]
FX The work of H. J. Haugan was performed under Air Force Contract No.
F33615-03-D-5801. The authors also thank S. Fenstermaker for technical
assistance with the molecular beam epitaxy. One of authors (H. H.)
thanks Professor M. E. Flatte, Professor T. F. Boggess, and Mr. B. V.
Olson at the Optical Science and Technology Center at the University of
Iowa for the lifetime data reported here.
NR 12
TC 12
Z9 12
U1 4
U2 15
PU AMER INST PHYSICS
PI MELVILLE
PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
SN 0021-8979
EI 1089-7550
J9 J APPL PHYS
JI J. Appl. Phys.
PD MAR 1
PY 2012
VL 111
IS 5
AR 053113
DI 10.1063/1.3693535
PG 4
WC Physics, Applied
SC Physics
GA 911OW
UT WOS:000301729200014
ER
PT J
AU Fickus, M
Mixon, DG
Tremain, JC
AF Fickus, Matthew
Mixon, Dustin G.
Tremain, Janet C.
TI Steiner equiangular tight frames
SO LINEAR ALGEBRA AND ITS APPLICATIONS
LA English
DT Article
DE Steiner; Equiangular; Tight; Frames; Restricted isometry
ID SEIDEL MATRICES; ERASURES; CONSTRUCTIONS; ROOTS; UNITY; LINES; SETS
AB We provide a new method for constructing equiangular tight frames (ETFs). The construction is valid in both the real and complex settings, and shows that many of the few previously-known examples of ETFs are but the first representatives of infinite families of such frames. It provides great freedom in terms of the frame's size and redundancy. This method also explicitly constructs the frame vectors in their native domain, as opposed to implicitly defining them via their Gram matrix. Moreover, in this domain, the frame vectors are very sparse. The construction is extremely simple: a tensor-like combination of a Steiner system and a regular simplex. This simplicity permits us to resolve an open question regarding ETFs and the restricted isometry property (RIP): we show that the RIP behavior of some ETFs is unfortunately no better than their coherence indicates. Published by Elsevier Inc.
C1 [Fickus, Matthew] USAF, Dept Math & Stat, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Mixon, Dustin G.] Princeton Univ, Program Appl & Computat Math, Princeton, NJ 08544 USA.
[Tremain, Janet C.] Univ Missouri, Dept Math, Columbia, MO 65211 USA.
RP Fickus, M (reprint author), USAF, Dept Math & Stat, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM Matthew.Fickus@afit.edu
FU NSF [DMS 1042701, CCF 1017278]; AFOSR [F1 ATA00083G004, F1
ATA00183G003]; A.B. Krongard Fellowship
FX The authors thank Prof. Peter G. Casazza for his insightful suggestions.
Fickus was supported by NSF DMS 1042701, NSF CCF 1017278, AFOSR F1
ATA00083G004 and AFOSR F1 ATA00183G003. Mixon was supported by the A.B.
Krongard Fellowship. Tremain was supported by NSF DMS 1042701. The views
expressed in this article are those of the authors and do not reflect
the official policy or position of the United States Air Force,
Department of Defense, or the US Government.
NR 34
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U1 1
U2 6
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0024-3795
J9 LINEAR ALGEBRA APPL
JI Linear Alg. Appl.
PD MAR 1
PY 2012
VL 436
IS 5
BP 1014
EP 1027
DI 10.1016/j.laa.2011.06.027
PG 14
WC Mathematics, Applied; Mathematics
SC Mathematics
GA 895FV
UT WOS:000300482500006
ER
PT J
AU Kalyanam, K
Chandler, P
Pachter, M
Darbha, S
AF Kalyanam, Krishnamoorthy
Chandler, Phil
Pachter, Meir
Darbha, Swaroop
TI Optimization of Perimeter Patrol Operations Using Unmanned Aerial
Vehicles
SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS
LA English
DT Article
ID SYSTEMS
AB This paper addresseses the following base perimeter patrol problem: a team of unmanned aerial vehicles (UAVs) equipped with cameras and a remotely located operator cooperatively perform the task of perimeter surveillance. There are m alert stations/sites on the perimeter where a nearby breaching of the perimeter by an intruder is flagged by an unattended ground sensor (UGS). To determine whether an incursion flagged by a UGS is a false alarm or a real threat, a patrolling UAV flies to the alert site to investigate the alert. The longer a UAV dwells (loiters) at an alert site, the more information it gathers; however, this also increases the delay in responding to other alerts. The decision problem for a UAV is to determine the optimal dwell time so as to maximize the expected payoff. In this paper, patrols consisting of one and two UAVs are considered. A stochastic dynamic programming approach is employed to obtain optimal policies for the patrolling UAVs. Theoretical performance bounds from queueing systems literature have been used to benchmark the optimal controller. Also, simulation results for the optimal patrols showing the expected information gained and response time for different alert arrival rates are presented.
C1 [Kalyanam, Krishnamoorthy] Infoscitex Corp, Dayton, OH 45431 USA.
[Chandler, Phil] USAF, Res Lab, Control Design & Anal Branch, Wright Patterson AFB, OH 45433 USA.
[Pachter, Meir] USAF, Inst Technol, Dept Elect Engn, Wright Patterson AFB, OH 45433 USA.
[Darbha, Swaroop] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA.
RP Kalyanam, K (reprint author), Infoscitex Corp, Dayton, OH 45431 USA.
EM krishnak@ucla.edu
FU National Research Council at the Air Force Research Laboratory; AFRL;
AFOSR [FA9550-10-1-0392]
FX This research was performed while the first author held a National
Research Council Research Associateship Award at the Air Force Research
Laboratory. This work was partly supported by the AFRL Summer Faculty
Program and AFOSR award no. FA9550-10-1-0392.
NR 19
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U1 2
U2 10
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0731-5090
J9 J GUID CONTROL DYNAM
JI J. Guid. Control Dyn.
PD MAR-APR
PY 2012
VL 35
IS 2
BP 434
EP 441
DI 10.2514/1.54720
PG 8
WC Engineering, Aerospace; Instruments & Instrumentation
SC Engineering; Instruments & Instrumentation
GA 910IT
UT WOS:000301631100008
ER
PT J
AU Mao, XY
Sun, H
Wang, W
Lu, YL
Chen, XB
AF Mao, Xiangyu
Sun, Hui
Wang, Wei
Lu, Yalin
Chen, Xiaobing
TI Effects of Co-substitutes on multiferroic properties of Bi5FeTi3O15
ceramics
SO SOLID STATE COMMUNICATIONS
LA English
DT Article
DE Multiferroics; Ferroelectrics; Ferromagnetism
ID BISMUTH TITANATE; THIN-FILMS; BI4TI3O12; FERROELECTRICS; SCATTERING;
BIFEO3; SYSTEM; RAMAN
AB The samples Bi5FeTi3O15 (BFTO) and Bi5Fe0.5Co0.5Ti3O15 (BFCT) were prepared by incorporating BiFeO3 (BFO) and BiFe0.5Co0.5O3 (BFCO) into the host Bi4Ti3O12 (BTO) using the solid state reaction technique. The Raman shift data indicate that the as-prepared materials are of the four-layer Aurivillius phase with an orthorhombic symmetry. At room temperature (RT) and under a driving electric field of 230 kV/cm, the half substitution of Fe by Co ions is found to result in the increase in the remanent polarization (2P(r)) by about 35% and simultaneously the decrease in 2E(c) by about 41%, respectively. The magnetic moment at least tripled its value by substituting half Fe ions by Co ions. The 2M(r) of BFCT is about three thousand times the value of BFTO. (C) 2012 Elsevier Ltd. All rights reserved.
C1 [Mao, Xiangyu; Sun, Hui; Wang, Wei; Chen, Xiaobing] Yangzhou Univ, Coll Phys Sci & Technol, Yangzhou 225002, Peoples R China.
[Lu, Yalin] USAF Acad, Dept Phys, Leser & Opt Res Ctr, Colorado Springs, CO 80840 USA.
RP Chen, XB (reprint author), Yangzhou Univ, Coll Phys Sci & Technol, Yangzhou 225002, Peoples R China.
EM yalin.lu@usafa.edu; xbchen@yzu.edu.cn
RI Sun, Hui/L-2826-2015
FU Chinese National Natural Science Foundation [51072177]; Jiangsu Province
Department of Education [08KJB140011]
FX This work was supported by the Chinese National Natural Science
Foundation (Grant No. 51072177) and the Jiangsu Province Department of
Education (Grant No. 08KJB140011).
NR 30
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U1 3
U2 59
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0038-1098
J9 SOLID STATE COMMUN
JI Solid State Commun.
PD MAR
PY 2012
VL 152
IS 6
BP 483
EP 487
DI 10.1016/j.ssc.2012.01.001
PG 5
WC Physics, Condensed Matter
SC Physics
GA 907EG
UT WOS:000301400000011
ER
PT J
AU Hall, RB
Rajagopal, KR
AF Hall, R. B.
Rajagopal, K. R.
TI Diffusion of a fluid through an anisotropically chemically reacting
thermoelastic body within the context of mixture theory
SO MATHEMATICS AND MECHANICS OF SOLIDS
LA English
DT Article
DE anisotropic; chemical; deformation; diffusion; maximum dissipation;
mixture; reaction; thermodynamics
ID THERMODYNAMIC FRAMEWORK; INELASTIC BEHAVIOR; HEAT-CONDUCTION; POLYMERS;
CRYSTALLIZATION; COMPOSITES; MECHANICS; VISCOSITY; MODELS
AB A mixture theory approach is used to analyze the change in response characteristics of an anisotropic, non-linear viscoelastic fluid diffusing through a finitely deforming thermoelastic body of arbitrary symmetry wherein the fluid chemically reacts with the solid. It is assumed for simplicity that it is possible to characterize the reaction as having a single step and as one in which the reaction products remain within the body, thereby modifying the solid constituent. The effects of the reaction on the solid that render it anisotropic are quantified by means of a tensorial parameter that tracks the extent of the reaction in different directions. Both diffusion-dominated (diffusion of the reactants is far more rapid than the reaction) and reaction-dominated (the reaction is far more rapid than the diffusion of the reactants) processes are considered. Constitutive equations are derived from the requirement that the rate of entropy production be maximized, which makes it possible to characterize the behavior of the body through the specification of three scalar functions: the rate of entropy production function for the mixture, and the Helmholtz free energies of each of the constituents. It is noted that the model may be applied to regions of bodies with locally homogeneous damage, that is, regions damaged at a small enough scale to mimic an anisotropically porous continuum. Macroscale damage may also be modeled via the boundary conditions described in Section 5.
C1 [Hall, R. B.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Rajagopal, K. R.] Texas A&M Univ, Dept Mech Engn, College Stn, TX 77843 USA.
RP Hall, RB (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM richard.hall@wpafb.af.mil
FU Air Force Office of Scientific Research (AFOSR) [LRIR 2302DR8P]
FX The authors thank the Air Force Office of Scientific Research (AFOSR)
for support of this work (Grant LRIR 2302DR8P).
NR 55
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U1 0
U2 3
PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 1081-2865
J9 MATH MECH SOLIDS
JI Math. Mech. Solids
PD MAR
PY 2012
VL 17
IS 2
BP 131
EP 164
DI 10.1177/1081286511407754
PG 34
WC Materials Science, Multidisciplinary; Mathematics, Interdisciplinary
Applications; Mechanics
SC Materials Science; Mathematics; Mechanics
GA 912MH
UT WOS:000301801600004
ER
PT J
AU Bales, J
Bales, K
Baugh, L
Tokish, J
AF Bales, James
Bales, Karrn
Baugh, Laura
Tokish, John
TI Evaluation for Ulnar Neuropathy at the Elbow in Ironman Triathletes:
Physical Examination and Electrodiagnostic Evidence
SO CLINICAL JOURNAL OF SPORT MEDICINE
LA English
DT Article
DE triathlon; Ironman; ulnar nerve; aerobars
ID NERVE; COMPRESSION
AB Objective: Evaluation of the elbow in Ironman triathletes for ulnar compression neuropathy caused by aerobar use.
Design: Descriptive laboratory study.
Setting: Ironman California 70.3, Ironman Arizona, Ironman New Orleans 70.3, San Antonio, Texas.
Participants: Study 1: (n = 712) Ironman California 70.3/Ironman Arizona participants. Study 2: (n = 54) Ironman New Orleans 70.3 finishers. Study 3: (n = 11) participants training for an Ironman triathlon.
Interventions: Pilot questionnaire (study 1). Pilot questionnaire and prerace and postrace physical examination (study 2). Pilot questionnaire and preride and postride (and postseason) physical examination, and electrodiagnostic testing (study 3).
Main Outcome Measures: Participants with symptoms, physical examination findings, and electrodiagnostic findings (amplitude or conduction velocity decrease) (P < 0.05).
Results: In study 1, 20.8% reported a history of ulnar symptoms. In study 2, 35.2% reported a history of ulnar symptoms. Preevent physical examination testing of the elbow showed 39.5% with positive Tinel sign and 41.5% with positive flexion/compression test. Postevent testing showed 70.4% with positive Tinel sign and 75.9% with positive flexion/compression test. In study 3, 46% reported ulnar symptoms. Preride physical examination testing showed 4.5% with positive Tinel sign and 9% with positive flexion/compression test. Postride testing showed 95.5% with positive Tinel sign and 91% with positive flexion/compression test. Postseason testing showed 64% with positive Tinel sign and 82% with positive flexion/compression test. Electrodiagnostic testing comparing preride and postride showed that ulnar nerve latency increased in 82%, amplitude decreased in 50%, and conduction velocity slowed in 64%. Electrodiagnostic testing comparing preseason and postseason showed that ulnar nerve latency increased in 73%, amplitude decreased in 64%, and conduction velocity slowed in 82%.
Conclusions: The findings support the hypothesis of an ulnar compression neuropathy at the elbow occurring at high rates in aerobar using Ironman triathletes.
Level of Significance: Prospective comparative study, 2.
C1 [Bales, James; Bales, Karrn; Baugh, Laura; Tokish, John] Wilford Hall Med Ctr Lackland AFB, Dept Orthopaed Surg, San Antonio, TX USA.
[Bales, Karrn] CHRISTUS Santa Rosa, San Antonio, TX USA.
[Bales, James] USAF Acad, Colorado Springs, CO 80840 USA.
[Baugh, Laura] Walter Reed Natl Mil Med Ctr, Dept Neurol, Bethesda, MD USA.
[Tokish, John] Tripler Army Med Ctr, Dept Orthopaed Surg, Honolulu, HI 96859 USA.
RP Bales, J (reprint author), 18270 Bent Oak Lane, Monument, CO 80132 USA.
EM jrtbales@gmail.com
NR 6
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U1 0
U2 3
PU LIPPINCOTT WILLIAMS & WILKINS
PI PHILADELPHIA
PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA
SN 1050-642X
J9 CLIN J SPORT MED
JI Clin. J. Sport Med.
PD MAR
PY 2012
VL 22
IS 2
BP 126
EP 131
DI 10.1097/JSM.0b013e3182427003
PG 6
WC Orthopedics; Physiology; Sport Sciences
SC Orthopedics; Physiology; Sport Sciences
GA 908RG
UT WOS:000301507200010
PM 22366630
ER
PT J
AU Kojima, F
Knopp, JS
AF Kojima, Fumio
Knopp, Jeremy S.
TI INVERSE PROBLEM FOR ELECTROMAGNETIC PROPAGATION IN A DIELECTRIC MEDIUM
USING MARKOV CHAIN MONTE CARLO METHOD
SO INTERNATIONAL JOURNAL OF INNOVATIVE COMPUTING INFORMATION AND CONTROL
LA English
DT Article; Proceedings Paper
CT 42nd International Symposium on Stochastic Systems Theory and its
Applications (SSS)
CY NOV 26-27, 2010
CL Okayama Univ Sci, Okayama, JAPAN
HO Okayama Univ Sci
DE Microwave; Dielectric loss; Electrical cable; FDTD; Metropolis-Hasting
algorithm
AB This paper is concerned with a stochastic inverse methodology arising in electromagnetic imaging. Nondestructive testing using guided microwaves covers a wide range of industrial applications including early detection of anomalies in conducting materials. The focus of this paper is the identification of electromagnetic material parameters and emphasis is on one dimensional scattering of a dielectric slab. The direct problem can be solved numerically using the finite-difference time-domain method (FDTD). The Markov Chain Monte Carlo method (MCMC) is applied to the inversion problem. Some successful results of computational experiments are demonstrated in order to show the feasibility and applicability of the proposed method.
C1 [Kojima, Fumio] Kobe Univ, Org Adv Sci & Technol, Nada Ku, Kobe, Hyogo 6578501, Japan.
[Knopp, Jeremy S.] USAF, AFRL RXLP, Nondestruct Evaluat Branch, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Kojima, F (reprint author), Kobe Univ, Org Adv Sci & Technol, Nada Ku, 1-1 Rokkodai Cho, Kobe, Hyogo 6578501, Japan.
EM kojima@koala.kobe-u.ac.jp
NR 10
TC 10
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U1 0
U2 1
PU ICIC INT
PI KUMAMOTO
PA TOKAI UNIV, 9-1-1, TOROKU, KUMAMOTO, 862-8652, JAPAN
SN 1349-4198
J9 INT J INNOV COMPUT I
JI Int. J. Innov. Comp. Inf. Control
PD MAR
PY 2012
VL 8
IS 3B
BP 2339
EP 2346
PG 8
WC Automation & Control Systems; Computer Science, Artificial Intelligence
SC Automation & Control Systems; Computer Science
GA 907GI
UT WOS:000301405400028
ER
PT J
AU Chen, MY
Ko, RT
AF Chen, M. Y.
Ko, R. T.
TI Nondestructive assessment of pore size in foam-based hybrid composite
material
SO JOURNAL OF ELASTOMERS AND PLASTICS
LA English
DT Article
DE foam; pore size; nondestructive; ultrasonic
ID WAVE-PROPAGATION; POROUS MATERIALS; FREQUENCY RANGE; ELASTIC WAVES
AB In situ nondestructive evaluation (NDE) during processing of high-temperature polymer-based hybrids offers great potential to gain close control of and achieve the desired level of pore size, with low overall development cost. During the polymer-curing cycle, close control over the evolution of volatiles would be beneficial to avoid the presence of pores or control of their sizes. Traditional NDE methods cannot realistically be expected to evaluate individual pores in such components as each pore evolves and grows during curing. However, NDE techniques offer the potential to detect and quantify the macroscopic response of many pores that are undesirable or intentionally introduced into these advanced materials. In this article, preliminary results will be presented for nondestructive assessment of pore size in foam-based hybrid composite materials using ultrasonic techniques. The ultrasonic method was chosen due to its high sensitivity to the change of composition in material, ability to provide the required depth of penetration and ability to provide the needed modulus information for the cured material through appropriate velocity measurements. Pore size was evaluated through the frequency content of ultrasonic signal. The effects of pore size on the attenuation of ultrasound were studied. Feasibility of this method was demonstrated on two types of foams with various pore sizes.
C1 [Ko, R. T.] Univ Dayton, Struct Integr Div, Res Inst, Dayton, OH 45433 USA.
[Chen, M. Y.] USAF, Res Lab, Mat & Mfg Directorate, Dayton, OH USA.
RP Ko, RT (reprint author), Univ Dayton, Struct Integr Div, Res Inst, 300 Coll Pk, Dayton, OH 45433 USA.
EM Ray.Ko@udri.udayton.edu
FU AFRL/RXBC branch in USAF AFMC
FX Support of this work is made possible through the AFRL/RXBC branch in
USAF AFMC.
NR 8
TC 0
Z9 0
U1 0
U2 4
PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 0095-2443
J9 J ELASTOM PLAST
JI J. Elastomer Plast.
PD MAR
PY 2012
VL 44
IS 2
BP 177
EP 188
DI 10.1177/0095244311426000
PG 12
WC Materials Science, Multidisciplinary; Polymer Science
SC Materials Science; Polymer Science
GA 908PF
UT WOS:000301501600005
ER
PT J
AU Lindler, L
Lesho, EP
Harms, DE
Myers, TE
Gaydos, JC
AF Lindler, Luther
Lesho, Emil P.
Harms, Dan E.
Myers, Todd E.
Gaydos, Joel C.
TI Influenza and Wound Infections: Laboratory Support for Deployed U.S.
Forces
SO MILITARY MEDICINE
LA English
DT Editorial Material
ID SURVEILLANCE; IRAQ
C1 [Lindler, Luther] Dept Homeland Secur, Washington, DC USA.
[Lesho, Emil P.] Walter Reed Army Inst Res, Silver Spring, MD USA.
[Harms, Dan E.] Tricare Management Agcy, Falls Church, VA USA.
[Myers, Todd E.] USN, Med Res Ctr, Silver Spring, MD USA.
[Gaydos, Joel C.] USAF, Hlth Surveillance Ctr, Silver Spring, MD USA.
RP Lindler, L (reprint author), Dept Homeland Secur, Washington, DC USA.
RI Valle, Ruben/A-7512-2013
NR 6
TC 2
Z9 2
U1 0
U2 0
PU ASSOC MILITARY SURG US
PI BETHESDA
PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 USA
SN 0026-4075
J9 MIL MED
JI Milit. Med.
PD MAR
PY 2012
VL 177
IS 3
BP 245
EP 247
PG 3
WC Medicine, General & Internal
SC General & Internal Medicine
GA 906CW
UT WOS:000301323500002
PM 22479910
ER
PT J
AU Chapman, PL
Cabrera, D
Varela-Mayer, C
Baker, M
Elnitsky, C
Figley, C
Thurman, RM
Lin, CD
Mayer, P
AF Chapman, Paula L.
Cabrera, David
Varela-Mayer, Christina
Baker, Monty
Elnitsky, Christine
Figley, Charles
Thurman, Ryan M.
Lin, Chii-Dean
Mayer, Paul
TI Training, Deployment Preparation, and Combat Experiences of Deployed
Health Care Personnel: Key Findings From Deployed U.S. Army Combat
Medics Assigned to Line Units
SO MILITARY MEDICINE
LA English
DT Article
AB Objective: To describe the perceptions of training and deployment preparation and combat experiences and exposures of U.S. Army combat medics. Methods: Data were from the first year of a 3-year longitudinal study designed to assess the impact of combat on the behavioral health and resilience of 347 combat medics surveyed 3 to 6 months after returning from a 12-month deployment to Operation Enduring Freedom/Operation Iraqi Freedom theatre and assigned to brigade combat teams. Results: Analyses indicated that combat medics may benefit from better preparation in types of shifts required during deployment, type and intensity of combat likely to be seen and experienced, more adequate training in the area of stress and mental health care management, and easier access to behavioral mental health care. Conclusions: The military has shown considerable progress in addressing, and understanding the mental health care needs of Soldiers. However, challenges remain. Additional emphasis should be placed on reducing the stigma and barriers related to mental health care both in theatre and garrison and on developing an evidence-based, validated program for medics and other Soldiers to recognize stress and mental health issues on the battlefield. For medics, this should be from two perspectives that of a combat Soldier and that of a medical provider.
C1 HSRD RRD Ctr Excellence Rehabil Outcomes, Tampa, FL 33637 USA.
[Cabrera, David] Uniformed Serv Univ Hlth Sci, Bethesda, MD 20814 USA.
[Varela-Mayer, Christina] Tampa VA Res & Educ Fdn, Zephyrhills, FL 33539 USA.
[Baker, Monty] Wilford Hall USAF Med Ctr, Behav Anal Serv, San Antonio, TX 78236 USA.
[Figley, Charles] Tulane Univ, Traumatol Inst, Grad Sch Social Work 301 A&C, New Orleans, LA 70118 USA.
[Lin, Chii-Dean] San Diego State Univ, Dept Math & Stat, San Diego, CA 92182 USA.
[Mayer, Paul] Dept Combat Med Training, Ft Sam Houston, TX 78234 USA.
FU Military Operational and Medical Research Program [W81XWH-09-1-00655,
9086003, PI 813-558-3909]
FX We acknowledge COL Sharon Reese and MAJ(P) Felicia Rivers at Darnel
Hospital, as well as the combat medics who participated in this
research. Without their support, this research could not have been
conducted. This research is funded by Military Operational and Medical
Research Program [W81XWH-09-1-00655 Prop No. 9086003, D. Cabrera (PI)].
For more information on this study, contact P. Chapman, Quantitative
co-PI 813-558-3909.
NR 13
TC 12
Z9 12
U1 0
U2 4
PU ASSOC MILITARY SURG US
PI BETHESDA
PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 USA
SN 0026-4075
J9 MIL MED
JI Milit. Med.
PD MAR
PY 2012
VL 177
IS 3
BP 270
EP 277
PG 8
WC Medicine, General & Internal
SC General & Internal Medicine
GA 906CW
UT WOS:000301323500005
PM 22479913
ER
PT J
AU Rowley, JD
Pierce, JK
Brant, AT
Halliburton, LE
Giles, NC
Schunemann, PG
Bristow, AD
AF Rowley, J. D.
Pierce, J. K.
Brant, A. T.
Halliburton, L. E.
Giles, N. C.
Schunemann, P. G.
Bristow, A. D.
TI Broadband terahertz pulse emission from ZnGeP2
SO OPTICS LETTERS
LA English
DT Article
ID MULTIPHOTON ABSORPTION; GENERATION; CRYSTAL; GAAS; SEMICONDUCTORS;
SPECTROSCOPY; AMPLIFIER
AB Optical rectification is demonstrated in (110)-cut ZnGeP2 (ZGP) providing broadband terahertz (THz) generation. The source is compared to both GaP and GaAs over a wavelength range of 1150 nm to 1600 nm and peak-intensity range of 0.5 GW/cm(2) to 40 GW/cm(2). ZGP peak-to-peak field amplitude is larger than in the other materials due to either lower nonlinear absorption or larger second-order nonlinearity. This material is well suited for broadband THz generation across a wide range of infrared excitation wavelengths. (C) 2012 Optical Society of America
C1 [Rowley, J. D.; Pierce, J. K.; Brant, A. T.; Halliburton, L. E.; Bristow, A. D.] W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA.
[Giles, N. C.] USAF, Dept Engn Phys, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Schunemann, P. G.] BAE Syst, Nashua, NH 03061 USA.
RP Bristow, AD (reprint author), W Virginia Univ, Dept Phys, Morgantown, WV 26506 USA.
EM alan.bristow@mail.wvu.edu
RI Bristow, Alan/F-9703-2013
FU WVNano Initiative
FX JDR wishes to thank the WVNano Initiative for support. The views
expressed in this article are those of the authors and do not
necessarily reflect the official policy or position of the Air Force,
the Department of Defense, or the United States Government.
NR 19
TC 13
Z9 13
U1 0
U2 20
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 0146-9592
J9 OPT LETT
JI Opt. Lett.
PD MAR 1
PY 2012
VL 37
IS 5
BP 788
EP 790
PG 3
WC Optics
SC Optics
GA 904KS
UT WOS:000301195100010
PM 22378394
ER
PT J
AU Loftis, AD
Reeves, WK
Miller, MM
Massung, RF
AF Loftis, Amanda D.
Reeves, Will K.
Miller, Myrna M.
Massung, Robert F.
TI Coxiella burnetii, the Agent of Q Fever, in Domestic Sheep Flocks from
Wyoming, United States
SO VECTOR-BORNE AND ZOONOTIC DISEASES
LA English
DT Article
DE Abortion; Coxiella burnetii; Livestock; Q fever; Sheep
ID EPIDEMIOLOGY
AB Coxiella burnetii, the agent of Q fever, is an intracellular bacterial pathogen. It has a nearly cosmopolitan distribution. We conducted a serological survey of domestic sheep herds for infections with C. burnetii in Wyoming following reports of abortion and open ewes. Based on the serologic evidence, there was no link between reproductive problems and exposure to C. burnetii. However, the overall prevalence of C. burnetii in WY sheep was 7%, which indicates that the agent is present in the environment and could pose a threat to public health.
C1 [Loftis, Amanda D.] Ross Univ, Sch Vet Med, Basseterre, St Kitts, W Ind Assoc St.
[Reeves, Will K.; Miller, Myrna M.] USDA, Dept Vet Sci, Arthropod Borne Anim Dis Res Lab, Laramie, WY USA.
[Massung, Robert F.] CDC, Dept Vet Sci, Rickettsial Zoonoses Branch, Atlanta, GA 30333 USA.
RP Reeves, WK (reprint author), USAF, SAM, PHR, 2951 5th St, Wright Patterson AFB, OH 45433 USA.
EM wkreeves@gmail.com
NR 13
TC 1
Z9 1
U1 1
U2 2
PU MARY ANN LIEBERT INC
PI NEW ROCHELLE
PA 140 HUGUENOT STREET, 3RD FL, NEW ROCHELLE, NY 10801 USA
SN 1530-3667
J9 VECTOR-BORNE ZOONOT
JI Vector-Borne Zoonotic Dis.
PD MAR
PY 2012
VL 12
IS 3
BP 189
EP 191
DI 10.1089/vbz.2011.0760
PG 3
WC Public, Environmental & Occupational Health; Infectious Diseases
SC Public, Environmental & Occupational Health; Infectious Diseases
GA 906NX
UT WOS:000301353600003
PM 22022809
ER
PT J
AU Bond, VL
Canfield, RA
Suleman, A
Blair, M
AF Bond, Vanessa L.
Canfield, Robert A.
Suleman, Afzal
Blair, Maxwell
TI Aeroelastic Scaling of a Joined Wing for Nonlinear Geometric Stiffness
SO AIAA JOURNAL
LA English
DT Article
ID FLUTTER
AB This study demonstrates an aeroelastic scaling procedure that accounts for geometric nonlinearity by scaling the eigenvalue associated with the buckling load. The Goland wing model was used as a case study to demonstrate that both the natural frequencies and mode shapes must be matched to properly scale the aeroelastic response. A variant of the Goland wing joined with a strut was developed as the case study for scaling geometric nonlinearity. Scaling its first buckling eigenvalue together with the natural frequencies and mode shapes resulted in accurate aeroelastically scaled response in the initial nonlinear range. The fully nonlinear response of the scaled model decreased in accuracy as the critical load predicted by the buckling eigenanalysis was approached.
C1 [Bond, Vanessa L.] USAF, Edwards Afb, CA 93524 USA.
[Canfield, Robert A.] Virginia Polytech Inst & State Univ, Dept Head Aerosp & Ocean Engn, Blacksburg, VA 24061 USA.
[Suleman, Afzal] Univ Victoria, Dept Mech Engn, Victoria, BC V8W 3P6, Canada.
[Blair, Maxwell] USAF, AFRL RBSD, Wright Patterson Afb, OH 45433 USA.
RP Bond, VL (reprint author), USAF, Edwards Afb, CA 93524 USA.
RI Canfield, Robert/C-1798-2012;
OI Canfield, Robert/0000-0003-3679-2815; Suleman, Afzal/0000-0001-8936-7340
FU U.S. Air Force Research Laboratory Air Vehicles Directorate (AFRL/RB)
FX The authors wish to thank the U.S. Air Force Research Laboratory Air
Vehicles Directorate (AFRL/RB) for its support of this research.
NR 13
TC 7
Z9 7
U1 1
U2 8
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0001-1452
J9 AIAA J
JI AIAA J.
PD MAR
PY 2012
VL 50
IS 3
BP 513
EP 522
DI 10.2514/1.41139
PG 10
WC Engineering, Aerospace
SC Engineering
GA 904NJ
UT WOS:000301204700001
ER
PT J
AU Gordeyev, S
Jumper, E
Hayden, TE
AF Gordeyev, Stanislav
Jumper, Eric
Hayden, Tim E.
TI Aero-Optical Effects of Supersonic Boundary Layers
SO AIAA JOURNAL
LA English
DT Article
ID FLOW
AB Aero-optical measurements of a zero-pressure-gradient, supersonic boundary layer along the test-section wall at M = 2.0 were performed using a Malley probe. The Malley probe captured both the amplitude of optical distortions and the convective speed. The convective speed of the optically active structures inside the supersonic boundary layer was found to be 0.84 of the freestream speed. The deflection-angle spectra were found to collapse with the local displacement thickness. The streamwise correlation function for the supersonic boundary layer revealed the presence of a pseudoperiodic structure with the typical size of 1.5 of the local boundary-layer thickness. A new model was developed to describe aero-optical effects of both the subsonic and the supersonic boundary layers. Finally, this new model and several other theoretical scalings were tested in the attempt to collapse both subsonic and supersonic boundary-layer aero-optical results.
C1 [Gordeyev, Stanislav; Jumper, Eric] Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 USA.
[Hayden, Tim E.] USAF Acad, Dept Aeronaut, Colorado Springs, CO 80840 USA.
RP Gordeyev, S (reprint author), Univ Notre Dame, Dept Aerosp & Mech Engn, Notre Dame, IN 46556 USA.
RI Gordeyev, Stanislav/A-7062-2013; Jumper, Eric/A-9856-2013
FU U.S. Air Force Office of Scientific Research [FA9550-09-1-0449]
FX This work was partially funded by the U.S. Air Force Office of
Scientific Research grant FA9550-09-1-0449. The U.S. Government is
authorized to reproduce and distribute reprints for government purposes
notwithstanding any copyright notation thereon. The authors would like
to thank Danny Washburn for providing assistance in the Trisonic Tunnel
measurements, especially the schlieren setup. They also thank the
Director for Aeronautics Research Center, U.S. Air Force Academy, Thomas
McLaughlin, for providing the opportunity to conduct the reported
research.
NR 23
TC 11
Z9 11
U1 1
U2 7
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0001-1452
J9 AIAA J
JI AIAA J.
PD MAR
PY 2012
VL 50
IS 3
BP 682
EP 690
DI 10.2514/1.J051266
PG 9
WC Engineering, Aerospace
SC Engineering
GA 904NJ
UT WOS:000301204700015
ER
PT J
AU Palazotto, A
Meador, S
AF Palazotto, Anthony
Meador, Stephen
TI Consideration of Wear at High Velocities Using a Hydrocode
SO AIAA JOURNAL
LA English
DT Article
C1 [Palazotto, Anthony; Meador, Stephen] USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
RP Palazotto, A (reprint author), USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
EM anthony.palazotto@afit.edu
FU Air Force Office of Scientific Research
FX The authors would like to thank Maj. Michelle Ewy of the Air Force
Office of Scientific Research for her financial support.
NR 17
TC 0
Z9 0
U1 1
U2 5
PU AMER INST AERONAUTICS ASTRONAUTICS
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0001-1452
J9 AIAA J
JI AIAA J.
PD MAR
PY 2012
VL 50
IS 3
BP 746
EP 751
DI 10.2514/1.J051431
PG 6
WC Engineering, Aerospace
SC Engineering
GA 904NJ
UT WOS:000301204700024
ER
PT J
AU Czyz, CN
Foster, JA
Lam, VB
Holck, DEE
Wulc, AE
Cahill, KV
Everman, KR
Michels, KS
AF Czyz, Craig N.
Foster, Jill A.
Lam, Vincent B.
Holck, David E. E.
Wulc, Allan E.
Cahill, Kenneth V.
Everman, Kelly R.
Michels, Kevin S.
TI Efficacy of Pulsed Electromagnetic Energy in Postoperative Recovery from
Blepharoplasty
SO DERMATOLOGIC SURGERY
LA English
DT Article
ID DOUBLE-BLIND; FIELDS; SURGERY; PAIN
AB BACKGROUND A novel medical device that has been approved by the Food and Drug Administration is available for treatment of postsurgical edema. The device emits a low-level, pulsed electromagnetic energy field, which modulates resting cell membrane potential, allowing a return to physiologic resting membrane potential.
OBJECTIVE To investigate the benefits of electromagnetic energy in eyelid wound healing. METHODS Fifty-seven individuals participated in this randomized, double-blinded study. All patients underwent upper blepharoplasty. At the postoperative visit, patients rated pain, edema, and ecchymosis, and the physician rated edema, ecchymosis, and erythema.
RESULTS There was no difference (p =.76) in patient pain rating when comparing placebo (1.6) with the patch (1.3). Patients reported 6% less edema (p =.11) and 10% less ecchymosis (p =.17) with the active patch eye than in control eye. The physician-graded edema, ecchymosis, and erythema had a mean Likerttype scale difference between placebo and active eyes of -0.3 (p =.12), -0.3 (p =.17), and -0.2 (p =.004) respectively.
CONCLUSION The use of pulsed electromagnetic energy did not have an effect on postoperative pain, edema, or ecchymosis as rated by patients and physicians. There was a statistically significant reduction in physician-graded erythema for active patch eyes versus placebo.
C1 [Czyz, Craig N.; Foster, Jill A.; Michels, Kevin S.] Ohio Univ, Div Ophthalmol, Sect Oculofacial Plast & Reconstruct Surg, Doctors Hosp, Columbus, OH USA.
[Czyz, Craig N.; Foster, Jill A.; Cahill, Kenneth V.; Everman, Kelly R.; Michels, Kevin S.] Grant Med Ctr, Dept Ophthalmol & Oral Maxillofacial Surg, Columbus, OH USA.
[Lam, Vincent B.; Wulc, Allan E.] Drexel Univ, Dept Ophthalmol, Sch Med, Philadelphia, PA 19104 USA.
[Holck, David E. E.] Wilford Hall USAF Med Ctr, Dept Ophthalmol, San Antonio, TX USA.
RP Czyz, CN (reprint author), 1100 Oregon Ave, Columbus, OH 43201 USA.
EM dsp4000@aol.com
NR 9
TC 8
Z9 9
U1 0
U2 0
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 1076-0512
J9 DERMATOL SURG
JI Dermatol. Surg.
PD MAR
PY 2012
VL 38
IS 3
BP 445
EP 450
DI 10.1111/j.1524-4725.2011.02215.x
PG 6
WC Dermatology; Surgery
SC Dermatology; Surgery
GA 901PP
UT WOS:000300979600014
PM 22092688
ER
PT J
AU Potter, RN
Cantrell, JA
Mallak, CT
Gaydos, JC
AF Potter, Robert N.
Cantrell, Joyce A.
Mallak, Craig T.
Gaydos, Joel C.
TI Adenovirus-associated Deaths in US Military during Postvaccination
Period, 1999-2010
SO EMERGING INFECTIOUS DISEASES
LA English
DT Article
ID ACUTE RESPIRATORY-DISEASE; ARMY TRAINEES; PNEUMONIA; VACCINES; ADULT;
TYPE-7
AB Adenoviruses are frequent causes of respiratory disease in the US military population. A successful immunization program against adenovirus types 4 and 7 was terminated in 1999. Review of records in the Mortality Surveillance Division, Armed Forces Medical Examiner System, identified 8 deaths attributed to adenovirus infections in service members during 1999-2010.
C1 [Potter, Robert N.; Cantrell, Joyce A.; Mallak, Craig T.] Armed Forces Med Examiner Syst, Rockville, MD USA.
[Gaydos, Joel C.] Armed Forces Hlth Surveillance Ctr, Silver Spring, MD USA.
RP Potter, RN (reprint author), 115 Purple Heart Dr, Dover Afb, DE 19902 USA.
EM robert.n.potter1@us.army.mil
FU Global Emerging Infections Surveillance and Response System of the Armed
Forces Health Surveillance Center, Silver Spring, Maryland
FX This work was funded in part by the Global Emerging Infections
Surveillance and Response System of the Armed Forces Health Surveillance
Center, Silver Spring, Maryland.
NR 15
TC 24
Z9 24
U1 2
U2 5
PU CENTERS DISEASE CONTROL
PI ATLANTA
PA 1600 CLIFTON RD, ATLANTA, GA 30333 USA
SN 1080-6040
EI 1080-6059
J9 EMERG INFECT DIS
JI Emerg. Infect. Dis
PD MAR
PY 2012
VL 18
IS 3
BP 507
EP 509
DI 10.3201/eid1803.111238
PG 3
WC Immunology; Infectious Diseases
SC Immunology; Infectious Diseases
GA 902FM
UT WOS:000301024000024
PM 22377242
ER
PT J
AU Bandino, ML
Tankersley, MS
AF Bandino, Michelle L.
Tankersley, Michael S.
TI The risk of allergic reactions to allergen extracts in personnel Reply
SO JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY
LA English
DT Letter
C1 [Bandino, Michelle L.; Tankersley, Michael S.] Wilford Hall USAF Med Ctr, Dept Med, Div Allergy Immunol, San Antonio, TX USA.
RP Bandino, ML (reprint author), Wilford Hall USAF Med Ctr, Dept Med, Div Allergy Immunol, San Antonio, TX USA.
EM michael.tankersley@lackland.af.mil
NR 3
TC 0
Z9 0
U1 0
U2 0
PU MOSBY-ELSEVIER
PI NEW YORK
PA 360 PARK AVENUE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0091-6749
J9 J ALLERGY CLIN IMMUN
JI J. Allergy Clin. Immunol.
PD MAR
PY 2012
VL 129
IS 3
BP 871
EP 871
DI 10.1016/j.jaci.2011.11.049
PG 1
WC Allergy; Immunology
SC Allergy; Immunology
GA 904IW
UT WOS:000301189300045
ER
PT J
AU Waller, MA
Fawcett, SE
AF Waller, Matthew A.
Fawcett, Stanley E.
TI The Total Cost Concept of Logistics: One of Many Fundamental Logistics
Concepts Begging for Answers
SO JOURNAL OF BUSINESS LOGISTICS
LA English
DT Editorial Material
C1 [Waller, Matthew A.] Univ Arkansas, Fayetteville, AR 72701 USA.
[Fawcett, Stanley E.] USAF, Inst Technol, Wright Patterson AFB, OH USA.
RP Waller, MA (reprint author), Univ Arkansas, Fayetteville, AR 72701 USA.
OI Waller, Matthew/0000-0002-6088-0164
NR 17
TC 7
Z9 8
U1 2
U2 9
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0735-3766
J9 J BUS LOGIST
JI J. Bus. Logist.
PD MAR
PY 2012
VL 33
IS 1
BP 1
EP 3
DI 10.1111/j.0000-0000.2011.01033.x
PG 3
WC Management
SC Business & Economics
GA 904XB
UT WOS:000301231100001
ER
PT J
AU Mann, RW
Berryman, HE
AF Mann, Robert W.
Berryman, Hugh E.
TI A Method for Defleshing Human Remains Using Household Bleach
SO JOURNAL OF FORENSIC SCIENCES
LA English
DT Article
DE forensic science; forensic anthropology; physical anthropology; human
remains; human skeleton; macerating remains; bleaching remains; human
bones; chest plate
ID MITOCHONDRIAL-DNA; BONES
AB Medical examiners and forensic anthropologists are often faced with the difficult task of removing soft tissue from the human skeleton without damaging the bones, teeth and, in some cases, cartilage. While there are a number of acceptable methods that can be used to remove soft tissue including macerating in water, simmering or boiling, soaking in ammonia, removing with scissors, knife, scalpel or stiff brush, and dermestid beetles, each has its drawback in time, safety, or potential to damage bone. This technical report using the chest plate of a stabbing victim presents a safe and effective alternative method for removing soft tissue from human remains, in particular the chest plate, following autopsy, without damaging or separating the ribs, sternum, and costal cartilage. This method can be used to reveal subtle blunt force trauma to bone, slicing and stabbing injuries, and other forms of trauma obscured by overlying soft tissue. Despite the published cautionary notes, when done properly household bleach (36% sodium hypochlorite) is a quick, safe, and effective method for examining cartilage and exposing skeletal trauma by removing soft tissue from human skeletal remains.
C1 [Mann, Robert W.] Joint POW MIA Accounting Command, Cent Identificat Lab, Hickam Afb, HI 96853 USA.
[Berryman, Hugh E.] Middle Tennessee State Univ, Forens Inst Res & Educ, Murfreesboro, TN 37129 USA.
RP Mann, RW (reprint author), Joint POW MIA Accounting Command, Cent Identificat Lab, 310 Worchester Ave, Hickam Afb, HI 96853 USA.
EM robert.mann@jpac.pacom.mil
NR 10
TC 3
Z9 3
U1 1
U2 14
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0022-1198
J9 J FORENSIC SCI
JI J. Forensic Sci.
PD MAR
PY 2012
VL 57
IS 2
BP 440
EP 442
DI 10.1111/j.1556-4029.2011.01987.x
PG 3
WC Medicine, Legal
SC Legal Medicine
GA 897XY
UT WOS:000300696400021
PM 22150429
ER
PT J
AU Pitz, GA
Sandoval, AJ
Zameroski, ND
Klennert, WL
Hostutler, DA
AF Pitz, Greg A.
Sandoval, Andrew J.
Zameroski, Nathan D.
Klennert, Wade L.
Hostutler, David A.
TI Pressure broadening and shift of the potassium D-1 transition by the
noble gases and N-2, H-2, HD, D-2, CH4, C2H6, C3H8, and n-C4H10 with
comparison to other alkali rates
SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
LA English
DT Article
DE Pressure broadening; Pressure shift; Potassium; Laser absorption;
Spectroscopy; DPAL
ID 795-NM RUBIDIUM LASER; RESONANCE LINES; FOREIGN GASES; 1ST DOUBLET;
CESIUM; HELIUM; HE-3
AB The pressure broadening and shift rates for the potassium D-1 (4(2)P(1/2) <- 4(2)S(1/2)) transition with the noble gases and He-3, H-2, HD, D-2, N-2, CH4, C2H6, C3H8, and n-C4H10 were obtained for pressures up to 80 Tort and at a temperature of 55 degrees C by means of laser absorption spectroscopy. The collisional broadening rate, gamma(L), for He, He-3, Ne, Ar, Kr, Xe, H-2, HD, D-2, N-2, CH4, C2H6, C3H8, and n-C4H10 are 13.08, 17.46, 6.14, 19.45, 16.64, 20.02, 22.15, 19.36, 17.47, 17.78, 29.35, 26.63, 27.27, and 27.85 MHz/Torr, respectively. The uncertainty in the broadening rates is typically less than 1.6%. The corresponding pressure induced shift rates, delta, are 1.63, 6.82, -1.27, -6.44, -5.42, -6.54,-5.34, -5.10, -4.70, -6.80, -7.41, -8.32, -8.59, and -8.80 MHz/Torr with a uncertainty of less than 2.4%. A comparison with the other alkali D-1 broadening cross-sections is presented. Published by Elsevier Ltd.
C1 [Pitz, Greg A.; Sandoval, Andrew J.; Hostutler, David A.] USAF, Res Lab, Kirtland AFB, NM 87117 USA.
[Zameroski, Nathan D.] Sandia Natl Labs, Albuquerque, NM 87123 USA.
[Klennert, Wade L.] Boeing Co, Albuquerque, NM 87109 USA.
RP Pitz, GA (reprint author), USAF, Res Lab, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM AFRL.RDLC.SCI.org@kirtland.af.mil
FU Air Force Office of Scientific Research; High Energy Laser Joint
Technology Office
FX Support for this work from the Air Force Office of Scientific Research
and the High Energy Laser Joint Technology Office is gratefully
acknowledged. We also want to thank Billy Pike and Don Stalnaker for
their help in the laboratory.
NR 36
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U1 0
U2 13
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0022-4073
EI 1879-1352
J9 J QUANT SPECTROSC RA
JI J. Quant. Spectrosc. Radiat. Transf.
PD MAR
PY 2012
VL 113
IS 5
BP 387
EP 395
DI 10.1016/j.jqsrt.2011.12.005
PG 9
WC Optics; Spectroscopy
SC Optics; Spectroscopy
GA 902AQ
UT WOS:000301011400009
ER
PT J
AU Berglund, RK
Tangen, CM
Powell, IJ
Lowe, BA
Haas, GP
Carroll, PR
Canby-Hagino, ED
White, RD
Hemstreet, GP
Crawford, D
Thompson, IM
Klein, EA
AF Berglund, Ryan K.
Tangen, Catherine M.
Powell, Isaac J.
Lowe, Bruce A.
Haas, Gabriel P.
Carroll, Peter R.
Canby-Hagino, Edith D.
White, Ralph deVere
Hemstreet, George P., III
Crawford, David
Thompson, Ian M., Jr.
Klein, Eric A.
TI Ten-year Follow-up of Neoadjuvant Therapy with Goserelin Acetate and
Flutamide Before Radical Prostatectomy for Clinical T3 and T4 Prostate
Cancer: Update on Southwest Oncology Group Study 9109
SO UROLOGY
LA English
DT Article
ID HIGH-RISK; TRIAL; RADIOTHERAPY; IRRADIATION; OUTCOMES; STAGE; EORTC
AB OBJECTIVE To update the results with 10-year data of a phase II prospective trial of neoadjuvant hormonal therapy with goserelin acetate and flutamide followed by radical prostatectomy for locally advanced prostate cancer (SWOG 9109). The optimal management for clinical stage T3 and T4 N0,M0 prostate cancer is uncertain.
MATERIALS AND METHODS Sixty-two patients with clinical stage T3 and T4 N0, M0 prostate cancer were enrolled. Cases were classified by stage T3 vs T4 and by volume of disease (bulky >4 cm and nonbulky <= 4 cm).
RESULTS Fifty-five of 61 eligible patients completed the trial with radical prostatectomy after neoadjuvant androgen deprivation therapy (ADT). The median preoperative prostate-specific antigen value was 19.8 ng/mL, and 67% of patients had a Gleason score of >= 7. Among 41 patients last known to be alive, median follow-up is 10.6 years (range 5.1-12.6). In all, 38 patients have had disease progression (30/55, 55%) or died without progression (8/55, 15%) for a 10-year progression-free survival (PFS) estimate of 40% (95% CI 27-53). Median PFS was 7.5 years, and median survival has not been reached. The 10-year overall survival (OS) estimate is 68% (95% CI 56-80).
CONCLUSIONS In this small, prospective phase II study, neoadjuvant hormonal therapy with goserelin acetate and flutamide followed by radical prostatectomy achieves long-term PFS and OS comparable with alternative treatments. This approach is feasible and may be an alternative to a strategy of combined radiation and ADT. UROLOGY 79: 633-637, 2012. (C) 2012 Elsevier Inc. All rights reserved.
C1 Cleveland Clin Fdn, Dept Urol, Cleveland, OH 44195 USA.
SW Oncol Grp, Ctr Stat, Seattle, WA USA.
Wayne State Univ, Med Ctr, Detroit, MI 48202 USA.
NW Urol Clin, Portland, OR USA.
SUNY Syracuse, Syracuse, NY USA.
Univ Calif San Francisco, San Francisco, CA 94143 USA.
Wilford Hall USAF Med Ctr, Brooke Army Med Ctr, Lackland AFB, TX USA.
Univ Calif Davis, Sacramento, CA 95817 USA.
Univ Nebraska Med Ctr, Omaha, NE USA.
Univ Colorado, Denver, CO 80202 USA.
Univ Texas Hlth Sci Ctr San Antonio, San Antonio, TX 78229 USA.
RP Berglund, RK (reprint author), Cleveland Clin, Dept Urol, 9500 Euclid Blvd,Q10-1, Cleveland, OH 44195 USA.
EM berglur@ccf.org
FU National Cancer Institute, DHHS [CA32102, CA38926, CA22433, CA14028,
CA76447, CA46441, CA42777, CA35178, CA46113, CA58658, CA20319, CA76132,
CA04919, CA35176, CA16385, CA35090, CA13612, CA58348]
FX This investigation was supported in part by the following PHS
Cooperative Agreement grant numbers awarded by the National Cancer
Institute, DHHS: CA32102, CA38926, CA22433, CA14028, CA76447, CA46441,
CA42777, CA35178, CA46113, CA58658, CA20319, CA76132, CA04919, CA35176,
CA16385, CA35090, CA13612, CA04919 and CA58348.
NR 15
TC 10
Z9 10
U1 0
U2 3
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0090-4295
J9 UROLOGY
JI Urology
PD MAR
PY 2012
VL 79
IS 3
BP 633
EP 637
DI 10.1016/j.urology.2011.11.019
PG 5
WC Urology & Nephrology
SC Urology & Nephrology
GA 903XB
UT WOS:000301154400044
PM 22386416
ER
PT J
AU Kahler, SW
AF Kahler, S. W.
TI SOLAR ENERGETIC PARTICLE EVENTS AND THE KIPLINGER EFFECT
SO ASTROPHYSICAL JOURNAL
LA English
DT Article
DE acceleration of particles; Sun: coronal mass ejections (CMEs); Sun:
flares; Sun: particle emission; Sun: X-rays, gamma rays
ID CORONAL MASS EJECTIONS; 20 JANUARY 2005; RAY SPECTRAL EVOLUTION; SOFT
X-RAYS; RELATIVISTIC PROTONS; FLARE; ACCELERATION; BURSTS; TEMPERATURE;
DEPENDENCE
AB The Kiplinger effect is an observed association of solar energetic (E > 10 MeV) particle (SEP) events with a "soft-hard-harder" (SHH) spectral evolution during the extended phases of the associated solar hard (E > 30 keV) X-ray (HXR) flares. Besides its possible use as a space weather predictor of SEP events, the Kiplinger effect has been interpreted as evidence of SEP production in the flare site itself, contradicting the widely accepted view that particles of large SEP events are predominately or entirely accelerated in shocks driven by coronal mass ejections (CMEs). We review earlier work to develop flare soft X-ray (SXR) and HXR spectra as SEP event forecast tools and then examine recent Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) evidence supporting the association of SHH HXR flares with large SEP events. We point out that ad hoc prediction criteria using the CME widths and SXR flare durations of associated RHESSI hard X-ray bursts (HXBs) can yield results comparable to those of the SHH prediction criteria. An examination of the RHESSI dynamic plots reveals several ambiguities in the determination of whether and when the SHH criteria are fulfilled, which must be quantified and applied consistently before an SHH-based predictive tool can be made. A comparative HXR spectral study beginning with the large population of relatively smaller SEP events has yet to be done, and we argue that those events will not be so well predicted by the SHH criteria. SHH HXR flares and CMEs are both components of large eruptive flare events, which accounts for the good connection of the SHH HXR flares with SEP events.
C1 USAF, Res Lab, RVBXS, Kirtland AFB, NM 87117 USA.
RP Kahler, SW (reprint author), USAF, Res Lab, RVBXS, 3550 Aberdeen Ave, Kirtland AFB, NM 87117 USA.
EM AFRL.RVB.PA@hanscom.af.mil
FU AFOSR [2301RDZ4]
FX This work was funded by AFOSR task 2301RDZ4. I thank G. Share and A.
Tylka for useful discussions, the ApJ reviewer for substantial
improvements in the paper, and James Grayson for posting plots of all
the RHESSI dynamic spectra of the events of the Grayson et al. (2009)
study on his Web site. This work made use of the LASCO CME catalog,
which is generated and maintained at the CDAW Data Center by NASA and
The Catholic University of America in cooperation with the Naval
Research Laboratory. SOHO is a project of international cooperation
between ESA and NASA.
NR 54
TC 7
Z9 8
U1 1
U2 8
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0004-637X
J9 ASTROPHYS J
JI Astrophys. J.
PD MAR 1
PY 2012
VL 747
IS 1
AR 66
DI 10.1088/0004-637X/747/1/66
PG 10
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 897EK
UT WOS:000300627300066
ER
PT J
AU Boxx, I
Arndt, CM
Carter, CD
Meier, W
AF Boxx, Isaac
Arndt, Christoph M.
Carter, Campbell D.
Meier, Wolfgang
TI High-speed laser diagnostics for the study of flame dynamics in a lean
premixed gas turbine model combustor
SO EXPERIMENTS IN FLUIDS
LA English
DT Article
ID INDUCED FLUORESCENCE; PIV MEASUREMENTS; SWIRL-FLAME; STEREOSCOPIC PIV;
HIGH-PRESSURE; PLIF; OH
AB A series of measurements was taken on two technically premixed, swirl-stabilized methane-air flames (at overall equivalence ratios of I center dot = 0.73 and 0.83) in an optically accessible gas turbine model combustor. The primary diagnostics used were combined planar laser-induced fluorescence of the OH radical and stereoscopic particle image velocimetry (PIV) with simultaneous repetition rates of 10 kHz and a measurement duration of 0.8 s. Also measured were acoustic pulsations and OH chemiluminescence. Analysis revealed strong local periodicity in the thermoacoustically self-excited (or 'noisy') flame (I center dot = 0.73) in the regions of the flow corresponding to the inner shear layer and the jet-inflow. This periodicity appears to be the result of a helical precessing vortex core (PVC) present in that region of the combustor. The PVC has a precession frequency double (at 570 Hz) that of the thermo-acoustic pulsation (at 288 Hz). A comparison of the various data sets and analysis techniques applied to each flame suggests a strong coupling between the PVC and the thermo-acoustic pulsation in the noisy flame. Measurements of the stable ('quiet') flame (I center dot = 0.83) revealed a global fluctuation in both velocity and heat-release around 364 Hz, but no clear evidence of a PVC.
C1 [Boxx, Isaac; Arndt, Christoph M.; Meier, Wolfgang] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Verbrennungstech, Stuttgart, Germany.
[Carter, Campbell D.] USAF, Res Lab, AFRL RZAS, Dayton, OH USA.
RP Boxx, I (reprint author), Deutsch Zentrum Luft & Raumfahrt DLR, Inst Verbrennungstech, Stuttgart, Germany.
EM Isaac.Boxx@dlr.de
OI Arndt, Christoph/0000-0003-0871-6620
FU Air Force Office of Scientific Research (AFOSR)
FX C. Carter acknowledges support of the Air Force Office of Scientific
Research (AFOSR) Windows on Europe Program. Figure 1a is reproduced with
permission from Springer-Verlag-from Sustained multi-kHz flamefront and
3-component velocity-field measurements, by I. Boxx, M. Stohr, C. Carter
and W. Meier. Appl Phys B (2009) 95: 23-29. and from Elsevier
Science-from Temporally resolved planar measurements of transient
phenomena in a partially pre-mixed swirl flame in a gas turbine model
combustor, by I. Boxx, M. Stohr, C. Carter and W. Meier. Combustion and
Flame, 157 (2009), 1,510-1,525. Figure 1b is reproduced with permission
from Elsevier Science-from Detailed characterization of the dynamics of
thermo-acoustic pulsations in a lean premixed swirl flame, by W. Meier,
P. Weigand, X. R. Duan, R. Giezendanner-Thoben. Combustion and Flame 150
(2007) 2-26.
NR 36
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U1 2
U2 26
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0723-4864
J9 EXP FLUIDS
JI Exp. Fluids
PD MAR
PY 2012
VL 52
IS 3
BP 555
EP 567
DI 10.1007/s00348-010-1022-x
PG 13
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA 899XB
UT WOS:000300848900002
ER
PT J
AU Killat, N
Montes, M
Pomeroy, JW
Paskova, T
Evans, KR
Leach, J
Li, X
Ozgur, U
Morkoc, H
Chabak, KD
Crespo, A
Gillespie, JK
Fitch, R
Kossler, M
Walker, DE
Trejo, M
Via, GD
Blevins, JD
Kuball, M
AF Killat, N.
Montes, M.
Pomeroy, J. W.
Paskova, T.
Evans, K. R.
Leach, J.
Li, X.
Oezguer, Ue
Morkoc, H.
Chabak, K. D.
Crespo, A.
Gillespie, J. K.
Fitch, R.
Kossler, M.
Walker, D. E.
Trejo, M.
Via, G. D.
Blevins, J. D.
Kuball, M.
TI Thermal Properties of AlGaN/GaN HFETs on Bulk GaN Substrates
SO IEEE ELECTRON DEVICE LETTERS
LA English
DT Article
DE AlGaN/GaN heterostructure field-effect transistor (HFET); bulk GaN
thermal conductivity; Raman thermography; thermal boundary resistance
ID BOUNDARY RESISTANCE; CONDUCTIVITY; TEMPERATURE
AB Micro-Raman thermography, microphotoluminescence spectroscopy, and thermal simulation were used to study the thermal properties of AlGaN/GaN heterostructure field-effect transistors grown on semi-insulating bulk GaN substrates. A bulk GaN thermal conductivity of 260 W . m(-1) . K-1 was determined from temperature measurements on operating devices in combination with finite-difference thermal simulations. This is significantly higher than typical thin GaN epilayer thermal conductivities, due to a lower dislocation density in bulk GaN. Despite the thermal conductivity of bulk GaN being lower than that of SiC, transistors on bulk GaN exhibited a similar thermal resistance as GaN-on-SiC devices, attributed to the absence of a thermal boundary resistance between the device epilayers and substrate for GaN-on-GaN devices.
C1 [Killat, N.; Montes, M.; Pomeroy, J. W.; Kuball, M.] Univ Bristol, HH Wills Phys Lab, Ctr Device Thermog & Reliabil, Bristol BS8 1TL, Avon, England.
[Paskova, T.] N Carolina State Univ, Dept Mat Sci & Engn, Raleigh, NC 27695 USA.
[Evans, K. R.; Leach, J.] Kyma Technol Inc, Raleigh, NC 27617 USA.
[Li, X.; Oezguer, Ue; Morkoc, H.] Virginia Commonwealth Univ, Dept Elect & Comp Engn, Richmond, VA 23284 USA.
[Chabak, K. D.; Crespo, A.; Gillespie, J. K.; Fitch, R.; Kossler, M.; Walker, D. E.; Trejo, M.; Via, G. D.; Blevins, J. D.] USAF, Res Lab, Dayton, OH 45433 USA.
RP Killat, N (reprint author), Univ Bristol, HH Wills Phys Lab, Ctr Device Thermog & Reliabil, Tyndall Ave, Bristol BS8 1TL, Avon, England.
EM Nicole.Killat@bristol.ac.uk; Miguel.Montes@bristol.ac.uk;
James.Pomeroy@bristol.ac.uk; tmpaskov@ncsu.edu; evans@kymatech.com;
leach@kymatech.com; lix9@vcu.edu; uozgur@vcu.edu; hmorkoc@vcu.edu;
Kelson.Chabak@wpafb.af.mil; antonio.crespo@wpafb.af.mil;
James.Gillespie@wpafb.af.mil; robert.fitch@wpafb.af.mil;
mauricio.kossler@wpafb.af.mil; dennis.walker@wpafb.af.mil;
manuel.trejo@wpafb.af.mil; Glen.Via@wpafb.af.mil;
John.Blevins@wpafb.af.mil; Martin.Kuball@bristol.ac.uk
RI Paskova, Tanya/D-2203-2009; Montes Bajo, Miguel/L-8147-2014
OI Montes Bajo, Miguel/0000-0002-9352-5820
FU Office of Naval Research (ONR); ONR Global through the DRIFT; Air Force
Research Laboratory through Kyma Technologies Inc.
FX This work was supported by the Office of Naval Research (ONR) and ONR
Global through the DRIFT program (monitored by Dr. Paul Maki). The work
at Virginia Commonwealth University was supported in part by the Air
Force Research Laboratory through Kyma Technologies Inc. The review of
this letter was arranged by Editor G. Meneghesso.
NR 20
TC 16
Z9 16
U1 1
U2 25
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0741-3106
J9 IEEE ELECTR DEVICE L
JI IEEE Electron Device Lett.
PD MAR
PY 2012
VL 33
IS 3
BP 366
EP 368
DI 10.1109/LED.2011.2179972
PG 3
WC Engineering, Electrical & Electronic
SC Engineering
GA 896PA
UT WOS:000300580000022
ER
PT J
AU Rao, R
Liptak, D
Cherukuri, T
Yakobson, BI
Maruyama, B
AF Rao, Rahul
Liptak, David
Cherukuri, Tonya
Yakobson, Boris I.
Maruyama, Benji
TI In situ evidence for chirality-dependent growth rates of individual
carbon nanotubes
SO NATURE MATERIALS
LA English
DT Article
ID CHEMICAL-VAPOR-DEPOSITION; RAMAN-SCATTERING; CATALYST; NANOPARTICLES;
SPECTROSCOPY; DYNAMICS; ANGLE
AB Chiral-selective growth of single-walled carbon nanotubes (SWNTs) remains a great challenge that hinders their use in applications such as electronics and medicine. Recent experimental(1,2) and theoretical(3,4) reports have begun to address this problem by suggesting that selectivity may be achieved during nucleation by changing the catalyst composition or structure. Nevertheless, to establish a rational basis for chiral-selective synthesis, the underlying mechanisms governing nucleation, growth, and termination of SWNTs must be better understood. To this end, we report the first measurements of growth rates of individual SWNTs through in situ Raman spectroscopy and correlate them with their chiral angles. Our results show that the growth rates are directly proportional to the chiral angles, in agreement with recent theoretical predictions(5,6). Importantly, the evidence singles out the growth stage as responsible for the chiral distribution-distinct from nucleation and termination which might also affect the final product distribution. Our results suggest a route to chiral-selective synthesis of SWNTs through rational synthetic design strategies based on kinetic control.
C1 [Rao, Rahul; Liptak, David; Cherukuri, Tonya; Maruyama, Benji] USAF, Res Lab, Mat & Mfg Directorate, RXBN, Wright Patterson AFB, OH 45433 USA.
[Liptak, David] Universal Energy Syst Inc, Dayton, OH 45432 USA.
[Yakobson, Boris I.] Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77005 USA.
[Yakobson, Boris I.] Rice Univ, Dept Chem, Houston, TX 77005 USA.
RP Rao, R (reprint author), Honda Res Inst, Columbus, OH 43212 USA.
EM rrao@honda-ri.com; benji.maruyama@wpafb.af.mil
OI Rao, Rahul/0000-0002-6415-0185
FU Air Force Office of Scientific Research; National Research Council
FX The authors are grateful to J. Lou for substrate fabrication. We also
thank J. Busbee, A. Harutyunyan, G. Chen, N. Pierce, P. T. Murray and E.
A. Stach for helpful discussions and assistance, and S. Maruyama for
assistance with sample design. The authors gratefully acknowledge
funding from the Air Force Office of Scientific Research and the
National Research Council.
NR 25
TC 98
Z9 98
U1 7
U2 130
PU NATURE PUBLISHING GROUP
PI LONDON
PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND
SN 1476-1122
J9 NAT MATER
JI Nat. Mater.
PD MAR
PY 2012
VL 11
IS 3
BP 213
EP 216
DI 10.1038/NMAT3231
PG 4
WC Chemistry, Physical; Materials Science, Multidisciplinary; Physics,
Applied; Physics, Condensed Matter
SC Chemistry; Materials Science; Physics
GA 897EA
UT WOS:000300625500020
PM 22286334
ER
PT J
AU Rao, SI
Dimiduk, DM
Parthasarathy, TA
Uchic, MD
Woodward, C
AF Rao, S. I.
Dimiduk, D. M.
Parthasarathy, T. A.
Uchic, M. D.
Woodward, C.
TI Atomistic simulations of intersection cross-slip nucleation in L1(2)
Ni3Al
SO SCRIPTA MATERIALIA
LA English
DT Article
DE L1(2) Ni3Al; Atomistic simulations; Cross slip; Activation energy;
Dislocation intersection
ID SCREW DISLOCATION INTERSECTIONS; ANOMALOUS YIELD STRESS; CENTERED-CUBIC
NICKEL; NI-AL SYSTEM; L12 ALLOYS; ORIENTATION DEPENDENCE; METALS;
COPPER; MODEL
AB Using atomistic simulations, the authors evaluate the activation barrier for a screw superdislocation to form the Paidar-Pope-Vitek (PPV) locked configuration when intersecting a forest dislocation in L1(2) Ni3Al, as a function of the superpartial core width. It is shown that the PPV lock is stable at the intersection, unlike when formed along an isolated dislocation line, and that the activation energy for cross slip at the forest dislocation intersection is significantly lower than that for cross slip along an isolated dislocation. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Rao, S. I.; Dimiduk, D. M.; Uchic, M. D.; Woodward, C.] USAF, Res Lab, Mat & Mfg Directorate, AFRLI MLLM, Wright Patterson AFB, OH 45433 USA.
[Parthasarathy, T. A.] Universal Energy Syst Inc, Dayton, OH 45432 USA.
RP Rao, SI (reprint author), USAF, Res Lab, Mat & Mfg Directorate, AFRLI MLLM, Wright Patterson AFB, OH 45433 USA.
EM Satish.Rao@wpafb.af.mil
RI Parthasarathy, Triplicane/B-7146-2011
OI Parthasarathy, Triplicane/0000-0002-5449-9754
FU AFOSR; DOD
FX The authors acknowledge use of the 3D molecular dynamics code, LAMMPS,
which was developed at Sandia National Laboratory by Dr Steve Plimpton
and co-workers. This work was supported by the AFOSR and by a grant of
computer time from the DOD High Performance Computing Modernization
Program at the Aeronautical Systems Center/Major Shared Resource Center.
NR 25
TC 3
Z9 3
U1 3
U2 20
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6462
J9 SCRIPTA MATER
JI Scr. Mater.
PD MAR
PY 2012
VL 66
IS 6
BP 410
EP 413
DI 10.1016/j.scriptamat.2011.12.002
PG 4
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 899IS
UT WOS:000300810200024
ER
PT J
AU Park, CH
Won, JW
Park, JW
Semiatin, SL
Lee, CS
AF Park, Chan Hee
Won, Jong Woo
Park, Jin-Woo
Semiatin, S. L.
Lee, Chong Soo
TI Mechanisms and Kinetics of Static Spheroidization of Hot-Worked
Ti-6Al-2Sn-4Zr-2Mo-0.1Si with a Lamellar Microstructure
SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND
MATERIALS SCIENCE
LA English
DT Article
ID COLONY-ALPHA MICROSTRUCTURE; PLATE-LIKE STRUCTURES; HEAT-TREATMENT;
DYNAMIC GLOBULARIZATION; COARSENING BEHAVIOR; SHAPE INSTABILITIES;
TITANIUM-ALLOY; FLOW BEHAVIOR; PLASTIC-FLOW; TI-6AL-4V
AB The effect of imposed strain epsilon, annealing temperature T (A), and annealing time tau on the static spheroidization behavior of Ti-6Al-2Sn-4Zr-2Mo-0.1Si having an initial lamellar microstructure was investigated. For this purpose, the samples were compressed isothermally at 1173 K (900 A degrees C) to epsilon = 1.0 and subsequently annealed at 1228 K (955 A degrees C) a parts per thousand currency sign T (A) a parts per thousand currency sign 1253 K (980 A degrees C) for 10 minutes a parts per thousand currency sign tau a parts per thousand currency sign 24 hours. For each test condition, metallography was performed to evaluate the change in aspect ratio (AR) and thus quantify the structural evolution from a lamellar to an equiaxed morphology. The average AR decreased rapidly during short annealing times as a result of sub-boundary-induced boundary splitting, but it decreased at a considerably slower rate during subsequent long-time, diffusion-controlled termination migration. The overall time to complete the static globularization was thus governed largely by termination migration. To model the observations, a kinetic equation describing the static spheroidization of two-phase titanium alloys was developed. A comparison of experimental results and predictions showed that the model can provide a reasonable prediction of the time required to complete diffusion-controlled migration of the edges of thin lamellar fragments that are circular or elliptical in shape.
C1 [Park, Chan Hee] Korea Inst Mat Sci, Adv Mat Res & Implementat Ctr, Chang Won 641831, South Korea.
[Won, Jong Woo; Lee, Chong Soo] Pohang Univ Sci & Technol, Dept Mat Sci & Engn, Pohang 790784, South Korea.
[Park, Jin-Woo] Kyungpook Natl Univ, Sch Dent, Dept Periodontol, Taegu 700412, South Korea.
[Semiatin, S. L.] USAF, Res Lab, AFRL RXLM, Wright Patterson AFB, OH 45433 USA.
RP Park, CH (reprint author), Korea Inst Mat Sci, Adv Mat Res & Implementat Ctr, Chang Won 641831, South Korea.
EM cslee@postech.ac.kr
RI Lee, Chong Soo/F-5814-2013; SEMIATIN, SHELDON/E-7264-2017;
OI Park, Jin-Woo/0000-0002-6632-023X
NR 22
TC 15
Z9 15
U1 0
U2 17
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1073-5623
J9 METALL MATER TRANS A
JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci.
PD MAR
PY 2012
VL 43A
IS 3
BP 977
EP 985
DI 10.1007/s11661-011-1019-y
PG 9
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 891CG
UT WOS:000300193300018
ER
PT J
AU Cummings, ML
How, JP
Whitten, A
Toupet, O
AF Cummings, M. L.
How, Jonathan P.
Whitten, Andrew
Toupet, Olivier
TI The Impact of HumanAutomation Collaboration in Decentralized Multiple
Unmanned Vehicle Control
SO PROCEEDINGS OF THE IEEE
LA English
DT Article
DE Command and control; decentralized task planning; decision support
systems; humanautomation interaction; human supervisory control;
unmanned vehicles
ID AERIAL VEHICLES; PERFORMANCE; SEARCH; UAVS
AB For future systems that require one or a small team of operators to supervise a network of automated agents, automated planners are critical since they are faster than humans for path planning and resource allocation in multivariate, dynamic, time-pressured environments. However, such planners can be brittle and unable to respond to emergent events. Human operators can aid such systems by bringing their knowledge-based reasoning and experience to bear. Given a decentralized task planner and a goal-based operator interface for a network of unmanned vehicles in a search, track, and neutralize mission, we demonstrate with a human-on-the-loop experiment that humans guiding these decentralized planners improved system performance by up to 50%. However, those tasks that required precise and rapid calculations were not significantly improved with human aid. Thus, there is a shared space in such complex missions for human-automation collaboration.
C1 [Cummings, M. L.; How, Jonathan P.] MIT, Cambridge, MA 02139 USA.
[Whitten, Andrew] USAF, Edwards AFB, CA 93524 USA.
[Toupet, Olivier] Aurora Flight Sci, Ctr Res & Dev, Cambridge, MA 02142 USA.
RP Cummings, ML (reprint author), MIT, 77 Massachusetts Ave, Cambridge, MA 02139 USA.
EM MissyC@mit.edu; jhow@mit.edu; andrew.whitten@edwards.af.mil;
otoupet@gmail.com
OI How, Jonathan/0000-0001-8576-1930
FU U.S. Office of Naval Research STTR
FX This work was supported by a U.S. Office of Naval Research STTR under
the guidance of Aurora Flight Sciences.
NR 31
TC 19
Z9 19
U1 1
U2 17
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-9219
EI 1558-2256
J9 P IEEE
JI Proc. IEEE
PD MAR
PY 2012
VL 100
IS 3
BP 660
EP 671
DI 10.1109/JPROC.2011.2174104
PG 12
WC Engineering, Electrical & Electronic
SC Engineering
GA 895OY
UT WOS:000300507100008
ER
PT J
AU Biswas, S
Gosztola, DJ
Wiederrecht, GP
Stroscio, MA
Dutta, M
AF Biswas, Sushmita
Gosztola, David J.
Wiederrecht, Gary P.
Stroscio, Michael A.
Dutta, Mitra
TI Annealing-Induced Morphological Changes in Nanocrystalline Quantum Dots
and Their Impact on Charge Transport Properties
SO JOURNAL OF ELECTRONIC MATERIALS
LA English
DT Article
DE Quantum dots; annealing; cadmium selenide; charge transport; morphology
ID LIGHT-EMITTING-DIODES; POLYMER; FILMS; PHOTODETECTORS
AB The effects of thermal annealing on the morphological and photoconductive properties of cadmium selenide quantum dots coated with zinc sulfide are studied. The results of transmission electron microscopy with in situ annealing show a number of events taking place simultaneously, including aggregation of dots, changes in the size and shape distribution, and reduction in interdot separation. Transient absorption results indicate that there is a small redshift of the spectrum. There is a shortening of the absorption decay lifetimes due to annealing. Higher photocurrents are measured in the annealed compared with unannealed dots at room temperature.
C1 [Biswas, Sushmita] USAF, Res Lab, Dayton, OH 45433 USA.
[Gosztola, David J.; Wiederrecht, Gary P.] Argonne Natl Lab, Ctr Nanoscale Mat, Argonne, IL 60439 USA.
[Stroscio, Michael A.; Dutta, Mitra] Univ Illinois, Dept Elect & Comp Engn, Chicago, IL 60607 USA.
[Stroscio, Michael A.] Univ Illinois, Dept Bioengn, Chicago, IL 60607 USA.
[Stroscio, Michael A.; Dutta, Mitra] Univ Illinois, Dept Phys, Chicago, IL 60607 USA.
RP Biswas, S (reprint author), USAF, Res Lab, 2941 Hobson Way, Dayton, OH 45433 USA.
EM dutta@uic.edu
RI Gosztola, David/D-9320-2011
OI Gosztola, David/0000-0003-2674-1379
FU US Department of Energy, Office of Science, Office of Basic Energy
Sciences [DE-AC02-06CH11357]
FX We thank Prof. Preston T. Snee from the Department of Chemistry at the
University of Illinois at Chicago, for providing the quantum dot
samples. We also thank Dr. Ke-Bin Low and Dr. Alan Nicholls from the
Research Resources Center, University of Illinois at Chicago, for the
TEM measurements. Use of the Center for Nanoscale materials, Argonne
National Laboratory was supported by the US Department of Energy, Office
of Science, Office of Basic Energy Sciences under Contract No.
DE-AC02-06CH11357.
NR 21
TC 4
Z9 6
U1 1
U2 7
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0361-5235
J9 J ELECTRON MATER
JI J. Electron. Mater.
PD MAR
PY 2012
VL 41
IS 3
BP 524
EP 529
DI 10.1007/s11664-011-1815-6
PG 6
WC Engineering, Electrical & Electronic; Materials Science,
Multidisciplinary; Physics, Applied
SC Engineering; Materials Science; Physics
GA 887LY
UT WOS:000299930100016
ER
PT J
AU Adiga, U
Taylor, D
Bell, B
Ponomareva, L
Kanzlemar, S
Kramer, R
Saldanha, R
Nelson, S
Lamkin, TJ
AF Adiga, Umesh
Taylor, Debbie
Bell, Brian
Ponomareva, Larissa
Kanzlemar, Stephen
Kramer, Ryan
Saldanha, Roland
Nelson, Sandra
Lamkin, Thomas J.
TI Automated Analysis and Classification of Infected Macrophages Using
Bright-Field Amplitude Contrast Data
SO JOURNAL OF BIOMOLECULAR SCREENING
LA English
DT Article
DE imaging technologies; image analysis; high-content screening; microscopy
ID VIDEO MICROSCOPY; MIGRATING CELLS; TRACKING
AB This article presents a methodology for acquisition and analysis of bright-field amplitude contrast image data in high-throughput screening (HTS) for the measurement of cell density, cell viability, and classification of individual cells into phenotypic classes. We present a robust image analysis pipeline, where the original data are subjected to image standardization, image enhancement, and segmentation by region growing. This work develops new imaging and analysis techniques for cell analysis in HTS and successfully addresses a particular need for direct measurement of cell density and other features without using dyes.
C1 [Adiga, Umesh; Bell, Brian; Saldanha, Roland] UES Inc, Dayton, OH USA.
[Taylor, Debbie; Kramer, Ryan; Lamkin, Thomas J.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Taylor, Debbie; Kramer, Ryan; Lamkin, Thomas J.] Univ Cincinnati, Dept Mol Genet Biochem & Microbiol, Cincinnati, OH USA.
[Ponomareva, Larissa; Nelson, Sandra] Univ Cincinnati, Ctr Drug Discovery, Cincinnati, OH USA.
[Kanzlemar, Stephen] Henry M Jackson Fdn Adv Mil Med, Bethesda, MD USA.
RP Lamkin, TJ (reprint author), 711th HPW RHPCB,2510 5th St,Area B,Bldg 840,Room, Wright Patterson AFB, OH 45433 USA.
EM Thomas.lamkin@wpafb.af.mil
FU Department of Defense through the Defense Threat Reduction Agency (DTRA)
[B102387M]
FX The authors disclosed receipt of the following financial support for the
research and/or authorship of this article: This work was supported by
the Transformational Medical Technologies program contract B102387M from
the Department of Defense Chemical and Biological Defense program
through the Defense Threat Reduction Agency (DTRA).
NR 15
TC 3
Z9 3
U1 1
U2 3
PU SAGE PUBLICATIONS INC
PI THOUSAND OAKS
PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA
SN 1087-0571
EI 1552-454X
J9 J BIOMOL SCREEN
JI J. Biomol. Screen
PD MAR
PY 2012
VL 17
IS 3
BP 401
EP 408
DI 10.1177/1087057111426902
PG 8
WC Biochemical Research Methods; Biotechnology & Applied Microbiology;
Chemistry, Analytical
SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology;
Chemistry
GA 891CA
UT WOS:000300192700013
PM 22058111
ER
PT J
AU Seletskiy, DV
Hehlen, MP
Epstein, RI
Sheik-Bahae, M
AF Seletskiy, Denis V.
Hehlen, Markus P.
Epstein, Richard I.
Sheik-Bahae, Mansoor
TI Cryogenic optical refrigeration
SO ADVANCES IN OPTICS AND PHOTONICS
LA English
DT Article
AB We review the field of laser cooling of solids, focusing our attention on the recent advances in cryogenic cooling of an ytterbium-doped fluoride crystal (Yb3+ : YLiF4). Recently, bulk cooling in this material to 155 K has been observed upon excitation near the lowest-energy (E4-E5) crystal-field resonance of Yb3+. Furthermore, local cooling in the same material to a minimum achievable temperature of 110 K has been measured, in agreement with the predictions of the laser cooling model. This value is limited only by the current material purity. Advanced material synthesis approaches reviewed here would allow reaching temperatures approaching 80 K. Current results and projected improvements position optical refrigeration as the only viable all-solid-state cooling approach for cryogenic temperatures. (C) 2012 Optical Society of America
C1 [Seletskiy, Denis V.; Epstein, Richard I.; Sheik-Bahae, Mansoor] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA.
[Hehlen, Markus P.] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA.
[Seletskiy, Denis V.] Space Vehicles Directorate, Air Force Res Lab, Kirtland AFB, NM 87117 USA.
RP Seletskiy, DV (reprint author), Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA.
EM d.seletskiy@gmail.com
RI Seletskiy, Denis/C-1372-2011;
OI Seletskiy, Denis/0000-0003-3480-4595; Epstein,
Richard/0000-0002-3929-4363
FU Air Force Office of Scientific Research (MURI program); DARPA; NASA;
U.S. Department of Energy; National Research Council Research
Associateship Award at the Air Force Research Laboratory
FX This work has been supported by the Air Force Office of Scientific
Research (MURI program), DARPA (seedling), NASA, and the U.S. Department
of Energy. D. V. Seletskiy acknowledges the support of a National
Research Council Research Associateship Award at the Air Force Research
Laboratory.
NR 139
TC 41
Z9 41
U1 2
U2 21
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1943-8206
J9 ADV OPT PHOTONICS
JI Adv. Opt. Photonics
PD MAR
PY 2012
VL 4
IS 1
BP 78
EP 107
DI 10.1364/AOP.4.000078
PG 30
WC Optics
SC Optics
GA V30WA
UT WOS:000208844900002
ER
PT J
AU Gensheimer, PD
Walker, CK
Ziolkowski, RW
d'Aubigny, CD
AF Gensheimer, Paul D.
Walker, Christopher K.
Ziolkowski, Richard W.
d'Aubigny, Christian Drouet
TI Full-Scale Three-Dimensional Electromagnetic Simulations of a Terahertz
Folded-Waveguide Traveling-Wave Tube Using ICEPIC
SO IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
LA English
DT Article
DE Terahertz (THz) technology; traveling-wave amplifiers; traveling-wave
devices; traveling-wave tubes (TWTs); waveguides
AB This paper discusses simulation and modeling of the slow wave structure of a folded-waveguide terahertz traveling wave tube (TWT) using the Improved Concurrent Electromagnetic Particle In Cell (ICEPIC) software. This is the first time ICEPIC has been used for simulation of a TWT amplifier. Cold test simulations compare favorably with analytical models; at 368 GHz, the on-axis interaction impedance is 7.8 Omega. Hot test (beam included) ICEPIC simulations were used to determine the effects of space charge on the gain calculations. At 368 GHz, the normalized beam plasma frequency from ICEPIC simulations is Omega(p) = 0.56. Analysis of our ICEPIC simulations at 368 GHz indicates a normalized beam plasma frequency 75% larger than an analytical model we improvised from a sheath helix model taken from the literature. The hot test ICEPIC simulations at 368GHz for a 64 periods long slow wave structure and a 10 mA, 25 kV electron beam produce small signal gain of 27 dB. The small-signal fractional 3-dB bandwidth of the TWT is 2.9%. The saturated fractional 3-dB bandwidth is 3.2%. Large signal simulations indicate that the saturated power at 368 GHz is 39.4 dBm and the saturated gain is 21.8 dB. A snapshot of a cross section of the electron beam shows bunching in space and a corresponding modulation in the velocity of the electron beam.
C1 [Gensheimer, Paul D.] USAF, Res Lab, Albuquerque, NM 87117 USA.
[Walker, Christopher K.] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA.
[Ziolkowski, Richard W.] Univ Arizona, Dept Elect & Comp Engn, Tucson, AZ 85721 USA.
[d'Aubigny, Christian Drouet] Teravision Inc, Tucson, AZ 85705 USA.
RP Gensheimer, PD (reprint author), USAF, Res Lab, Albuquerque, NM 87117 USA.
EM icepic@kirtland.af.mil
FU National Science Foundation [NSF OII-0539952, IIP-0836204]; DARPA
[HR0011-05-C-006]
FX This material is based upon work supported by the National Science
Foundation under Grant NSF OII-0539952 and Grant IIP-0836204. This work
was supported in part by DARPA under Contract HR0011-05-C-006.
NR 21
TC 2
Z9 6
U1 2
U2 4
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 2156-342X
J9 IEEE T THZ SCI TECHN
JI IEEE Trans. Terahertz Sci. Technol.
PD MAR
PY 2012
VL 2
IS 2
BP 222
EP 230
DI 10.1109/TTHZ.2011.2178931
PG 9
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA 142AA
UT WOS:000318766700011
ER
PT J
AU Lopez, N
Previc, FH
Fischer, J
Heitz, RP
Engle, RW
AF Lopez, Nadia
Previc, Fred H.
Fischer, Joseph
Heitz, Richard P.
Engle, Randall W.
TI Effects of sleep deprivation on cognitive performance by United States
Air Force pilots
SO JOURNAL OF APPLIED RESEARCH IN MEMORY AND COGNITION
LA English
DT Article
DE Fatigue; Attention; Flight; Cognition; Errors
AB This study examined the effects of 35 h of continuous sleep deprivation on performance in a variety of cognitive tasks as well as simulated flight. Ten United States Air Force pilots completed the Multi-Attribute Task Battery (MATB), Psychomotor Vigilance Task (PVT), and Operation Span Task (OSPAN), as well as simulated flight at 3 h intervals over a 35 h sleep deprivation period. Performance declined on all tests after about 18-20 h of continuous sleep deprivation, although the degree to which performance degraded varied. During the second half of the sleep deprivation period, performance on the simulated flight was predicted by PVT and OSPAN reasonably well but much less so by the MATB. Variance from optimal flight performance was predicted by both PVT and OSPAN but each measure added incremental validity to the prediction. The two measures together accounted for 58% of the variance in flight performance in the second half of the sleep deprivation period. (C) 2011 Society for Applied Research in Memory and Cognition. Published by Elsevier Inc. All rights reserved.
C1 [Lopez, Nadia] Air Force Res Lab, Biodynam & Protect Div, Wright Patterson AFB, OH USA.
[Previc, Fred H.] Texas A&M Univ, College Stn, TX 77843 USA.
[Heitz, Richard P.] Vanderbilt Univ, Nashville, TN USA.
[Engle, Randall W.] Georgia Inst Technol, Sch Psychol, Atlanta, GA 30332 USA.
RP Engle, RW (reprint author), Georgia Inst Technol, Sch Psychol, 654 Cherry St, Atlanta, GA 30332 USA.
EM randall.engle@gatech.edu
FU Air Force Research Laboratory
FX We wish to thank Col. Dave Tubbs of the Advanced Instrument School at
Randolph Air Force Base for allowing us to recruit from his group and
the pilots who participated in this research study. This research study
was funded by the Air Force Research Laboratory.
NR 29
TC 4
Z9 4
U1 2
U2 2
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 2211-3681
EI 2211-369X
J9 J APPL RES MEM COGN
JI J. Appl. Res. Mem. Cogn.
PD MAR
PY 2012
VL 1
IS 1
BP 27
EP 33
DI 10.1016/j.jarmac.2011.10.002
PG 7
WC Psychology, Experimental
SC Psychology
GA V38TE
UT WOS:000209364900005
ER
PT J
AU Jablonowski, BL
Bartoloni, JA
Hensley, DM
Vandewalle, KS
AF Jablonowski, Beth L.
Bartoloni, Joseph A.
Hensley, Donna M.
Vandewalle, Kraig S.
TI Fluoride release from newly marketed fluoride varnishes
SO QUINTESSENCE INTERNATIONAL
LA English
DT Article
DE caries; fluoride; varnish
ID CARIES RISK-ASSESSMENT; DENTAL-CARIES; TOPICAL TREATMENT; WHOLE SALIVA;
PREVENTION; CHILDREN; HEALTH; DISCRIMINATION; ADOLESCENTS; MECHANISM
AB Objective: New fluoride varnishes have been marketed that reportedly release more fluoride (Enamel Pro) or release fluoride more slowly (Vanish XT). The purpose of this study was to compare the amount and rate of fluoride release of new fluoride varnishes with other traditional fluoride varnishes. Method and Materials: Extracted molars were cut into block sections. The enamel surfaces of the sections were painted with Enamel Pro, Duraphat, Vanish, or Vanish XT fluoride varnishes. One group was not treated and served as a negative control. The tooth sections were immersed in artificial saliva. The concentration of fluoride in parts per million was measured after the first 30 minutes, daily for the first week, and weekly until the level was below the limit of detection. Fluoride release was plotted over time. Cumulative fluoride release and rate of release (slope) were analyzed using one-way ANOVA/Tukey (alpha = .05). Results: Enamel Pro had the greatest cumulative fluoride release. There was no significant difference between Duraphat and Vanish. Vanish XT had the lowest cumulative fluoride release. The rate of fluoride release from 1 week to limit of detection was Enamel Pro > Vanish > Duraphat > Vanish XT. Conclusion: The two newly marketed fluoride varnishes (Enamel Pro and Vanish XT) had significantly different fluoride release from the two conventional fluoride varnishes (Duraphat and Vanish). (Quintessence Int 2012;43:221-228)
C1 [Jablonowski, Beth L.] Spangdahlem AB, Spangdahlem, Germany.
[Bartoloni, Joseph A.] Univ Texas Hlth Sci Ctr San Antonio, Sch Dent, Dept Comprehens Dent, San Antonio, TX 78229 USA.
[Hensley, Donna M.] Div Clin Res, Lackland AFB, TX USA.
RP Vandewalle, KS (reprint author), Wilford Hall USAF Med Ctr, 1615 Truemper St, Lackland AFB, TX 78236 USA.
EM kraig.vandewalle@us.af.mil
NR 52
TC 7
Z9 7
U1 0
U2 1
PU QUINTESSENCE PUBLISHING CO INC
PI HANOVER PARK
PA 4350 CHANDLER DRIVE, HANOVER PARK, IL 60133 USA
SN 0033-6572
J9 QUINTESSENCE INT
JI Quintessence Int.
PD MAR
PY 2012
VL 43
IS 3
BP 221
EP 228
PG 8
WC Dentistry, Oral Surgery & Medicine
SC Dentistry, Oral Surgery & Medicine
GA 125YC
UT WOS:000317577000008
PM 22299122
ER
PT J
AU Mao, XY
Wang, W
Sun, H
Lu, YL
Chen, XB
AF Mao, Xiangyu
Wang, Wei
Sun, Hui
Lu, Yalin
Chen, Xiaobing
TI Influence of different synthesizing steps on the multiferroic properties
of Bi5Fe1Ti3O15 and Bi5Fe0.5Co0.5Ti3O15 ceramics
SO JOURNAL OF MATERIALS SCIENCE
LA English
DT Article
ID FERROELECTRIC POLARIZATION; ELECTRICAL-PROPERTIES; BISMUTH TITANATE;
DOPED BI4TI3O12; SINGLE-CRYSTAL; THIN-FILMS; BIFEO3; BI5FETI3O15;
POWDER; FAMILY
AB The compounds Bi5FeTi3O15 (BFTO) and Bi5Fe0.5Co0.5Ti3O15 (BFCT) were prepared by incorporating BiFeO3 (BFO) and BiFe0.5Co0.5O3 (BFCO) into the host Bi4Ti3O12 (abbreviated as BFTO-1 and BFCT-1) and by the conventional solid-state reaction method (abbreviated as BFTO-2 and BFCT-2). X-ray analysis indicates a four-layer Aurivillius phases with an orthorhombic symmetry. At room temperature, the remnant polarization (2P (r)) of BFTO-1, BFTO-2, BFCT-1, and BFCT-2 samples are measured to be 11.0, 3.5, 13, and 6.3 mu C/cm(2), respectively, and the corresponding remnant magnetization (2M (r)) are about 2.72 x 10(-3) memu/g, 1.51 x 10(-3) memu/g, 7.6 and 2.1 memu/g, respectively. Both BFTO-1 and BFCT-1 samples exhibit the dielectric peaks at around 755 and 772 A degrees C in their epsilon-T curves, respectively.
C1 [Mao, Xiangyu; Wang, Wei; Sun, Hui; Chen, Xiaobing] Yangzhou Univ, Coll Phys Sci & Technol, Yangzhou 225002, Peoples R China.
[Lu, Yalin] USAF Acad, Dept Phys, Laser & Opt Res Ctr, Colorado Springs, CO 80840 USA.
RP Chen, XB (reprint author), Yangzhou Univ, Coll Phys Sci & Technol, Yangzhou 225002, Peoples R China.
EM xbchen@yzu.edu.cn
RI Sun, Hui/L-2826-2015
FU Chinese National Natural Science Foundation [51072177]; Jiangsu Province
Department of Education [08KJB140011]
FX This study was supported by the Chinese National Natural Science
Foundation (Grant No. 51072177) and Jiangsu Province Department of
Education (Grant No. 08KJB140011).
NR 36
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U1 4
U2 59
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 0022-2461
J9 J MATER SCI
JI J. Mater. Sci.
PD MAR
PY 2012
VL 47
IS 6
BP 2960
EP 2965
DI 10.1007/s10853-011-6129-9
PG 6
WC Materials Science, Multidisciplinary
SC Materials Science
GA 879LM
UT WOS:000299330700052
ER
PT J
AU Calhoon, WH
Zambon, AC
Sekar, B
Kiel, B
AF Calhoon, William H., Jr.
Zambon, Andrea C.
Sekar, Balu
Kiel, Barry
TI Subgrid Scale Combustion Modeling Based on Stochastic Model
Parameterization
SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE
ASME
LA English
DT Article
ID NON-PREMIXED COMBUSTION; TURBULENT TRANSPORT; REYNOLDS-NUMBER
AB A new modeling formulation for turbulent chemistry interactions in large-eddy simulation (LES) is presented that is based on a unique application of the linear-eddy model (LEM) that includes large scale strain effects. This novel application of the LEM may be used to predict turbulent flame extinction limits due to both small and large scale strain effects. Statistics from this modeling formulation may be used to generate an inexpensive run-time model for LES predictions. This paper presents the LEM modeling formulation and demonstrates the capabilities of the approach for augmenter conditions. A methodology is also presented for formulating an LES-linear-eddy model (LES-LEM) subgrid model based on the simulation data. [DOI: 10.1115/1.4004254]
C1 [Calhoon, William H., Jr.; Zambon, Andrea C.] Combust Res & Flow Technol Inc, CRAFT Tech, Huntsville, AL 35802 USA.
[Calhoon, William H., Jr.; Zambon, Andrea C.] Combust Res & Flow Technol Inc, CRAFT Tech, Pipersville, PA 18947 USA.
[Sekar, Balu; Kiel, Barry] USAF, Res Lab, AFRL RZTC, Wright Patterson AFB, OH 45433 USA.
RP Calhoon, WH (reprint author), Combust Res & Flow Technol Inc, CRAFT Tech, Huntsville, AL 35802 USA.
FU AFRL/RZTC; Wright-Patterson Air Force Base under an AFRL
FX The authors gratefully acknowledge Dr. Balu Sekar and Dr. Barry Kiel of
AFRL/RZTC, Wright-Patterson Air Force Base, for supporting this research
under an AFRL Phase I SBIR program.
NR 22
TC 1
Z9 1
U1 1
U2 4
PU ASME-AMER SOC MECHANICAL ENG
PI NEW YORK
PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0742-4795
J9 J ENG GAS TURB POWER
JI J. Eng. Gas. Turbines Power-Trans. ASME
PD MAR
PY 2012
VL 134
IS 3
AR 031505
DI 10.1115/1.4004254
PG 12
WC Engineering, Mechanical
SC Engineering
GA 874OH
UT WOS:000298967400006
ER
PT J
AU Brockman, RA
Braisted, WR
Olson, SE
Tenaglia, RD
Clauer, AH
Langer, K
Shepard, MJ
AF Brockman, Robert A.
Braisted, William R.
Olson, Steven E.
Tenaglia, Richard D.
Clauer, Allan H.
Langer, Kristina
Shepard, Michael J.
TI Prediction and characterization of residual stresses from laser shock
peening
SO INTERNATIONAL JOURNAL OF FATIGUE
LA English
DT Article
DE Finite elements; Laser shock peening; Residual stresses; Fatigue;
Statistics
ID SIMULATION
AB The use of laser shock peening (LSP) to enhance the fatigue resistance of metals offers several potential advantages over more conventional surface enhancement techniques such as shot peening, including deeper penetration of the residual stresses, more reliable surface coverage, and the potential for reduced microstructural damage. In the last decade, computational hardware and software resources have advanced to a state that permits numerical simulation of practical LSP processing at a reasonable level of detail, including complex geometric features, multiple and overlapping laser pulses, and intensity variations within the individual laser spots. This article offers some further developments in simulating LSP processes on a realistic scale, as well as some simple methods for distilling and interpreting results from such simulations. A key point of interest is the local variations in residual stress that occur within the processed region, which are quite sensitive to processing variables, and not easily measured experimentally. The simulations suggest that X-ray diffraction measurements of the residual stress field offer only a coarse description of the final residual stress field, and should be interpreted with some caution. We propose some methods for interpreting the simulation results statistically, to provide a clear but accurate characterization of the surface treatment and its effect on fatigue behavior. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Brockman, Robert A.; Braisted, William R.; Olson, Steven E.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Tenaglia, Richard D.; Clauer, Allan H.] LSP Technol, Dublin, OH USA.
[Langer, Kristina; Shepard, Michael J.] USAF, Res Lab, AFRL RBSM, Wright Patterson AFB, OH 45433 USA.
RP Brockman, RA (reprint author), Univ Dayton, Res Inst, Dayton, OH 45469 USA.
EM robert.brockman@udri.udayton.edu
FU Air Force Research Laboratory; DoD [USAF-3446-31-SC-0001]; AFRL/RBSM;
AFRL/RXLMN; Wright-Patterson Air Force Base, Ohio; AFRL/RXP
FX This work was supported by the Air Force Research Laboratory, AFRL/RBSM
and AFRL/RXLMN, under DoD contract USAF-3446-31-SC-0001. The authors
gratefully acknowledge the contributions of Dr. Shamachary Sathish and
Mr. Rick Reibel of UDRI, and of Lambda Research, Inc. of Cincinnati,
Ohio, in performing XRD measurements. AFRL/RXP kindly provided
facilities and support for some of the XRD measurements. Computational
resources and support were provided by the High Performance Computing
Modernization Program DSRC Facility at Wright-Patterson Air Force Base,
Ohio. We are particularly grateful for applications support provided by
Mr. Terry McClurg of Computer Sciences Corporation.
NR 18
TC 27
Z9 33
U1 5
U2 55
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0142-1123
EI 1879-3452
J9 INT J FATIGUE
JI Int. J. Fatigue
PD MAR
PY 2012
VL 36
IS 1
BP 96
EP 108
DI 10.1016/j.ijfatigue.2011.08.011
PG 13
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA 856BR
UT WOS:000297612000011
ER
PT J
AU Gunzelmann, G
Gluck, KA
Moore, LR
Dinges, DF
AF Gunzelmann, Glenn
Gluck, Kevin A.
Moore, L. Richard, Jr.
Dinges, David F.
TI Diminished access to declarative knowledge with sleep deprivation
SO COGNITIVE SYSTEMS RESEARCH
LA English
DT Article
DE Sleep deprivation; Fatigue; Computational model; Declarative knowledge;
Memory retrieval; Activation
ID SUSTAINED ATTENTION PERFORMANCE; NEUROBEHAVIORAL PERFORMANCE; COGNITIVE
PERFORMANCE; MATHEMATICAL-MODELS; INTEGRATED THEORY; FATIGUE;
CONSEQUENCES; WAKEFULNESS; STRATEGIES; EMOTION
AB Inadequate sleep affects cognitive functioning, with often subtle and occasionally catastrophic personal and societal consequences. Unfortunately, this topic has received little attention in the cognitive modeling literature, despite the potential payoff. In this paper, we provide evidence regarding the impact of sleep deprivation on a particular component of cognitive performance, the ability to access and use declarative knowledge. Every 2 h throughout an extended period of sleep deprivation, participants completed 50 trials of a serial addition/subtraction task requiring knowledge of single-digit arithmetic facts. Over the course of 88 h awake, response times increased while accuracy declined. A computational model accounts for the degradation in performance through a reduction in the activation of declarative knowledge. This knowledge is required for successful completion of the serial addition/subtraction task, but access to the declarative knowledge is impaired as sleep deprivation increases and alertness declines. Importantly, the mechanism provides a generalizable quantitative account relevant to other tasks and contexts. It also provides a process-level understanding of how cognitive performance declines with increasing levels of sleep loss. Published by Elsevier B.V.
C1 [Gunzelmann, Glenn; Gluck, Kevin A.] USAF, Res Lab, Cognit Models & Agents Branch HPW RHAC 711, Mesa, AZ 85212 USA.
[Moore, L. Richard, Jr.] Lockheed Martin AF Res Lab, Mesa, AZ 85212 USA.
[Dinges, David F.] Univ Penn, Div Sleep & Chronobiol, Dept Psychiat, Sch Med, Philadelphia, PA 19104 USA.
RP Gunzelmann, G (reprint author), USAF, Res Lab, Cognit Models & Agents Branch HPW RHAC 711, 6030 S Kent St, Mesa, AZ 85212 USA.
EM glenn.gunzelmann@us.af.mil
FU Air Force Research Laboratory's (AFRL) Warfighter Readiness Research
Division; Air Force Office of Scientific Research (AFOSR) [07HE01COR,
F49620-00-1-0266, FA9550-05-1-0293]; National Space Biomedical Research
Institute through NASA [NCC 9-58]
FX The views expressed in this article are those of the authors and do not
reflect the official policy or position of the Department of Defense or
the US Government. The research was sponsored by the Air Force Research
Laboratory's (AFRL) Warfighter Readiness Research Division and by Grants
07HE01COR, F49620-00-1-0266, and FA9550-05-1-0293 from the Air Force
Office of Scientific Research (AFOSR), and by the National Space
Biomedical Research Institute through NASA NCC 9-58. An earlier version
of the model was presented at the 29th Annual Meeting of the Cognitive
Science Society. We appreciate conversations with Hans Van Dongen on
this research and comments from him and three anonymous reviewers on
earlier versions of this paper.
NR 50
TC 4
Z9 4
U1 4
U2 12
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1389-0417
J9 COGN SYST RES
JI Cogn. Syst. Res.
PD MAR
PY 2012
VL 13
IS 1
BP 1
EP 11
DI 10.1016/j.cogsys.2010.09.001
PG 11
WC Computer Science, Artificial Intelligence; Neurosciences; Psychology,
Experimental
SC Computer Science; Neurosciences & Neurology; Psychology
GA 844JY
UT WOS:000296744700001
ER
PT J
AU Hysell, DL
Varney, RH
Vlasov, MN
Nossa, E
Watkins, B
Pedersen, T
Huba, JD
AF Hysell, D. L.
Varney, R. H.
Vlasov, M. N.
Nossa, E.
Watkins, B.
Pedersen, T.
Huba, J. D.
TI Estimating the electron energy distribution during ionospheric
modification from spectrographic airglow measurements
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID PUMP ENHANCED AIRGLOW; GROSS EARTH DATA; SUPRATHERMAL ELECTRONS; HEATING
EXPERIMENTS; MAGNETIC ZENITH; F-REGION; LANGMUIR TURBULENCE;
THERMAL-ELECTRONS; CROSS-SECTIONS; HF
AB The electron energy distribution during an F region ionospheric modification experiment at the HAARP facility near Gakona, Alaska, is inferred from spectrographic airglow emission data. Emission lines at 630.0, 557.7, and 844.6 nm are considered along with the absence of detectable emissions at 427.8 nm. Estimating the electron energy distribution function from the airglow data is a problem in classical linear inverse theory. We describe an augmented version of the method of Backus and Gilbert which we use to invert the data. The method optimizes the model resolution, the precision of the mapping between the actual electron energy distribution and its estimate. Here, the method has also been augmented so as to limit the model prediction error. Model estimates of the suprathermal electron energy distribution versus energy and altitude are incorporated in the inverse problem formulation as representer functions. Our methodology indicates a heater-induced electron energy distribution with a broad peak near 5 eV that decreases approximately exponentially by 30 dB between 5-50 eV.
C1 [Hysell, D. L.; Varney, R. H.; Vlasov, M. N.; Nossa, E.] Cornell Univ, Ithaca, NY 14853 USA.
[Watkins, B.] Univ Alaska Fairbanks, Inst Geophys, Fairbanks, AK 99775 USA.
[Pedersen, T.] USAF, Space Vehicles Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
[Huba, J. D.] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA.
RP Hysell, DL (reprint author), Cornell Univ, Ithaca, NY 14853 USA.
OI Varney, Roger/0000-0002-5976-2638
FU DARPA [HR0011-09-C-0099]; Office of Naval Research; Air Force Research
Laboratory [N00014-07-1-1079]; Air Force Office of Scientific Research;
High Frequency Active Auroral Research Program (HAARP)
FX This project was supported by DARPA through contract HR0011-09-C-0099.
Additional support came from the High Frequency Active Auroral Research
Program (HAARP) and from the Office of Naval Research and the Air Force
Research Laboratory under grant N00014-07-1-1079 to Cornell. Work at
AFRL was supported by the Air Force Office of Scientific Research.
NR 50
TC 4
Z9 4
U1 0
U2 5
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-9380
EI 2169-9402
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD FEB 29
PY 2012
VL 117
AR A02317
DI 10.1029/2011JA017187
PG 13
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 903RE
UT WOS:000301135600001
ER
PT J
AU Schmidt, JB
Ganguly, BN
AF Schmidt, Jacob B.
Ganguly, Biswa N.
TI Point-to-plane pulsed discharge initiated flame structure modification
in propane-air flame (vol 45, 045203, 2012)
SO JOURNAL OF PHYSICS D-APPLIED PHYSICS
LA English
DT Correction
C1 [Schmidt, Jacob B.] Spectral Energies Inc, Dayton, OH 45432 USA.
[Ganguly, Biswa N.] USAF, Res Lab, Wright Patterson AFB, OH 45432 USA.
RP Schmidt, JB (reprint author), Spectral Energies Inc, Dayton, OH 45432 USA.
NR 1
TC 0
Z9 0
U1 0
U2 1
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0022-3727
J9 J PHYS D APPL PHYS
JI J. Phys. D-Appl. Phys.
PD FEB 29
PY 2012
VL 45
IS 8
AR 089601
DI 10.1088/0022-3727/45/8/089601
PG 1
WC Physics, Applied
SC Physics
GA 896YC
UT WOS:000300606300011
ER
PT J
AU Huang, CS
AF Huang, Chao-Song
TI Statistical analysis of dayside equatorial ionospheric electric fields
and electrojet currents produced by magnetospheric substorms during
sawtooth events
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID LOW-LATITUDE IONOSPHERE; MAGNETOMETER OBSERVATIONS; DRIFT VELOCITIES;
MAGNETIC-FIELD; ART.; PENETRATION; PHASE; ONSET; ELECTRODYNAMICS;
CONVECTION
AB Substorms cause significant disturbances in the ionosphere. However, it has not been well understood how the electric field and electrojet in the dayside equatorial ionosphere respond to substorm onset. Previous studies found that the equatorial electric field, after substorm onset, could be eastward or westward. Because the onset of isolated substorms is often related to a northward turning of the interplanetary magnetic field (IMF), the measured total electric field is determined by contributions from both IMF northward turning and substorm onset and is not necessarily the signature of the onset. In order to exclude the effect of IMF northward turning, we analyze the variations of ionospheric electric field and electrojet during storm time substorms when the IMF remains stable. Thus, the ionospheric variations can be identified to be caused solely by substorms. The electric field data are measured by the Jicamarca radar, and the electrojet is derived from magnetometers at Jicamarca and Piura. It is found that substorm onset induces an eastward electric field and electrojet in the dayside equatorial ionosphere when the IMF remains continuously southward across the onset. The equatorial electrojet starts to increase at the onset, reaches a maximum value similar to 30 min after the onset, and then decreases to the pre-onset value similar to 60 min after the onset. Westward electric field and counter-electrojet occur only if the substorm onset is associated with a northward turning of the IMF. It is concluded that the effect of substorm onset on the dayside equatorial ionosphere, without involvement of IMF reorientations, is an enhanced eastward electric field.
C1 USAF, Res Lab, Kirtland AFB, NM 87117 USA.
RP Huang, CS (reprint author), USAF, Res Lab, Bldg 570,3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM chaosong.huang@kirtland.af.mil
FU Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0321];
National Science Foundation [AGS-1003652]
FX This study was supported, in part, by the Air Force Office of Scientific
Research (AFOSR) award FA9550-09-1-0321 and, in part, by the National
Science Foundation award AGS-1003652. The author gratefully acknowledges
the Jicamarca Radio Observatory for providing the radar and magnetometer
data, Los Alamos National Laboratory for providing the proton flux data,
and NASA GSFC CDAWeb for providing access to the solar wind data.
NR 49
TC 9
Z9 9
U1 0
U2 3
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD FEB 28
PY 2012
VL 117
AR A02316
DI 10.1029/2011JA017398
PG 10
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 903RC
UT WOS:000301135400003
ER
PT J
AU Miller, JD
Dedic, CE
Roy, S
Gord, JR
Meyer, TR
AF Miller, Joseph D.
Dedic, Chloe E.
Roy, Sukesh
Gord, James R.
Meyer, Terrence R.
TI Interference-free gas-phase thermometry at elevated pressure using
hybrid femtosecond/picosecond rotational coherent anti-Stokes Raman
scattering
SO OPTICS EXPRESS
LA English
DT Article
ID INELASTIC-COLLISIONS; HIGH-TEMPERATURE; CARS; SPECTROSCOPY; N-2;
NITROGEN; SUPPRESSION; AIR
AB Rotational-level-dependent dephasing rates and nonresonant background can lead to significant uncertainties in coherent anti-Stokes Raman scattering (CARS) thermometry under high-pressure, low-temperature conditions if the gas composition is unknown. Hybrid femtosecond/picosecond rotational CARS is employed to minimize or eliminate the influence of collisions and nonresonant background for accurate, frequency-domain thermometry at elevated pressure. The ability to ignore these interferences and achieve thermometric errors of <5% is demonstrated for N-2 and O-2 at pressures up to 15 atm. Beyond 15 atm, the effects of collisions cannot be ignored but can be minimized using a short probe delay (similar to 6.5 ps) after Raman excitation, thereby improving thermometric accuracy with a time-and frequency-resolved theoretical model. (C) 2012 Optical Society of America
C1 [Miller, Joseph D.; Dedic, Chloe E.; Meyer, Terrence R.] Iowa State Univ Sci & Technol, Dept Mech Engn, Ames, IA 50011 USA.
[Roy, Sukesh] Spectral Energies LLC, Dayton, OH 45431 USA.
[Gord, James R.] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
[Meyer, Terrence R.] Univ Erlangen Nurnberg, Erlangen Grad Sch Adv Opt Technol SAOT, Erlangen, Germany.
RP Miller, JD (reprint author), Iowa State Univ Sci & Technol, Dept Mech Engn, Ames, IA 50011 USA.
EM trm@iastate.edu
FU National Science Foundation [CBET-1056006]; Air Force Office of
Scientific Research
FX Funding was provided, in part, by the National Science Foundation
(CBET-1056006, Dr. A. Atreya, Program Official) and Air Force Office of
Scientific Research (Drs. T. Curcic and M. Birkan, Program Managers). J.
Miller was supported by the National Science Foundation Graduate
Fellowship Program. The authors also thank M. Johnson and B. Halls of
Iowa State University and Drs. S. Danczyk and D. Talley of the Air Force
Research Laboratory.
NR 25
TC 16
Z9 16
U1 3
U2 17
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD FEB 27
PY 2012
VL 20
IS 5
BP 5003
EP 5010
DI 10.1364/OE.20.005003
PG 8
WC Optics
SC Optics
GA 902QL
UT WOS:000301053200018
PM 22418304
ER
PT J
AU Serak, SV
Hakobyan, RS
Nersisyan, SR
Tabiryan, NV
White, TJ
Bunning, TJ
Steeves, DM
Kimball, BR
AF Serak, Svetlana V.
Hakobyan, Rafael S.
Nersisyan, Sarik R.
Tabiryan, Nelson V.
White, Timothy J.
Bunning, Timothy J.
Steeves, Diane M.
Kimball, Brian R.
TI All-optical diffractive/transmissive switch based on coupled cycloidal
diffractive waveplates
SO OPTICS EXPRESS
LA English
DT Article
ID NEMATIC LIQUID-CRYSTALS; GRATINGS; POLARIZATION; REFLECTORS; MICROSCOPY;
PHASE; FILMS
AB Pairs of cycloidal diffractive waveplates can be used to doubly diffract or collinearly propagate laser radiation of the appropriate wavelength. The use of a dynamic phase retarder placed in between the pair can be utilized to switch between the two optical states. We present results from the implementation of an azo-based retarder whose optical properties can be modulated using light itself. We show fast and efficient switching between the two states for both CW and single nanosecond laser pulses of green radiation. Contrasts greater than 100: 1 were achieved. The temporal response as a function of light intensity is presented and the optical switching is shown to be polarization independent. (C) 2012 Optical Society of America
C1 [Serak, Svetlana V.; Hakobyan, Rafael S.; Nersisyan, Sarik R.; Tabiryan, Nelson V.] Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
[White, Timothy J.; Bunning, Timothy J.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Steeves, Diane M.; Kimball, Brian R.] USA, Natick Soldier Res, Ctr Dev & Engn, Natick, MA 01760 USA.
RP Serak, SV (reprint author), Beam Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
EM Timothy.Bunning@wpafb.af.mil
RI White, Timothy/D-4392-2012
NR 40
TC 7
Z9 7
U1 1
U2 19
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD FEB 27
PY 2012
VL 20
IS 5
BP 5460
EP 5469
DI 10.1364/OE.20.005460
PG 10
WC Optics
SC Optics
GA 902QL
UT WOS:000301053200066
PM 22418352
ER
PT J
AU Huang, CS
Retterer, JM
de La Beaujardiere, O
Roddy, PA
Hunton, DE
Ballenthin, JO
Pfaff, RF
AF Huang, Chao-Song
Retterer, J. M.
de La Beaujardiere, O.
Roddy, P. A.
Hunton, D. E.
Ballenthin, J. O.
Pfaff, R. F.
TI Observations and simulations of formation of broad plasma depletions
through merging process
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID EQUATORIAL SPREAD-F; NONLINEAR EVOLUTION; BACKSCATTER PLUMES; DRIFTS;
CLIMATOLOGY; GENERATION; JICAMARCA; BUBBLES; GROWTH
AB Broad plasma depletions in the equatorial ionosphere near dawn are region in which the plasma density is reduced by 1-3 orders of magnitude over thousands of kilometers in longitude. This phenomenon is observed repeatedly by the Communication/Navigation Outage Forecasting System (C/NOFS) satellite during deep solar minimum. The plasma flow inside the depletion region can be strongly upward. The possible causal mechanism for the formation of broad plasma depletions is that the broad depletions result from merging of multiple equatorial plasma bubbles. The purpose of this study is to demonstrate the feasibility of the merging mechanism with new observations and simulations. We present C/NOFS observations for two cases. A series of plasma bubbles is first detected by C/NOFS over a longitudinal range of 3300-3800 km around midnight. Each of the individual bubbles has a typical width of similar to 100 km in longitude, and the upward ion drift velocity inside the bubbles is 200-400 m s(-1). The plasma bubbles rotate with the Earth to the dawn sector and become broad plasma depletions. The observations clearly show the evolution from multiple plasma bubbles to broad depletions. Large upward plasma flow occurs inside the depletion region over 3800 km in longitude and exists for similar to 5 h. We also present the numerical simulations of bubble merging with the physics-based low-latitude ionospheric model. It is found that two separate plasma bubbles join together and form a single, wider bubble. The simulations show that the merging process of plasma bubbles can indeed occur in incompressible ionospheric plasma. The simulation results support the merging mechanism for the formation of broad plasma depletions.
C1 [Huang, Chao-Song; de La Beaujardiere, O.; Roddy, P. A.; Hunton, D. E.; Ballenthin, J. O.] USAF, Space Vehicles Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
[Retterer, J. M.] Boston Coll, Inst Sci Res, Chestnut Hill, MA 02467 USA.
[Pfaff, R. F.] NASA, Space Weather Lab, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA.
RP Huang, CS (reprint author), USAF, Space Vehicles Directorate, Res Lab, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM chaosong.huang@kirtland.af.mil
RI Pfaff, Robert/F-5703-2012
OI Pfaff, Robert/0000-0002-4881-9715
FU Air Force Office of Scientific Research (AFOSR) [FA9550-09-1-0321]; Air
Force Research Laboratory; Department of Defense; National Aeronautics
and Space Administration (NASA); Naval Research Laboratory; Aerospace
Corporation
FX Work by C.S.H. was supported by the Air Force Office of Scientific
Research (AFOSR) award FA9550-09-1-0321. The C/NOFS mission is supported
by the Air Force Research Laboratory, the Department of Defense Space
Test Program, the National Aeronautics and Space Administration (NASA),
the Naval Research Laboratory, and the Aerospace Corporation.
NR 39
TC 13
Z9 13
U1 1
U2 3
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD FEB 23
PY 2012
VL 117
AR A02314
DI 10.1029/2011JA017084
PG 11
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 899NR
UT WOS:000300823200001
ER
PT J
AU Henney, CJ
Toussaint, WA
White, SM
Arge, CN
AF Henney, C. J.
Toussaint, W. A.
White, S. M.
Arge, C. N.
TI Forecasting F-10.7 with solar magnetic flux transport modeling
SO SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS
LA English
DT Article
ID 10.7 CM FLUX; IRRADIANCE VARIATIONS; RADIO OBSERVATIONS; ACTIVE REGIONS;
SUNSPOT NUMBER; FIELDS; INDEXES; WIND; SUN; EMISSION
AB A new method is presented here to forecast the solar 10.7 cm (2.8 GHz) radio flux, abbreviated F-10.7, utilizing advanced predictions of the global solar magnetic field generated by a flux transport model. Using indices derived from the absolute value of the solar magnetic field, we find good correlation between the observed photospheric magnetic activity and the observed F-10.7 values. Comparing magnetogram data observed within 6 hours of the F-10.7 measurements during the years 1993 through 2010, the Spearman correlation coefficient, r(s), for an empirical model of F-10.7 is found to be 0.98. In addition, we find little change in the empirical model coefficients and correlations between the first and second 9 year intervals of the 18 year period investigated. By evolving solar magnetic synoptic maps forward 1-7 days, this new method provides a realistic estimation of the Earth-side solar magnetic field distribution used to forecast F-10.7. Spearman correlation values of approximately 0.97, 0.95, and 0.93 are found for 1 day, 3 day, and 7 day forecasts, respectively. The method presented here can be expanded to forecast other space weather parameters, e.g., total solar irradiance and extreme ultraviolet flux. In addition, near-term improvements to the F-10.7 forecasting method, e.g., including far-side magnetic data with solar magnetic flux transport, are discussed. Citation: Henney, C.J., W.A. Toussaint, S.M. White, and C.N. Arge (2012), Forecasting F-10.7 with solar magnetic flux transport modeling, Space Weather, 10, S02011, doi:10.1029/2011SW000748.
C1 [Henney, C. J.; White, S. M.; Arge, C. N.] USAF, Space Vehicles Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
[Toussaint, W. A.] Natl Solar Observ, Tucson, AZ 85719 USA.
RP Henney, CJ (reprint author), USAF, Space Vehicles Directorate, Res Lab, 3550 Aberdeen Ave,SE, Kirtland AFB, NM 87117 USA.
EM cjhenney@gmail.com
FU AFRL's (Air Force Research Laboratory) Space Weather Forecasting
Laboratory (SWFL); AFOSR (Air Force Office of Scientific Research);
Canadian Space Agency
FX We are grateful to Luca Bertello and John Harvey for helpful discussions
regarding the scaling of VSM magnetogram data. In addition, we
gratefully acknowledge the two referees for helpful comments and
suggestions. The work presented here was partially supported by the
AFRL's (Air Force Research Laboratory) Space Weather Forecasting
Laboratory (SWFL). The ADAPT software used in this work was developed
with support by a grant from the AFOSR (Air Force Office of Scientific
Research). The 10.7 cm solar radio flux data service is operated by the
National Research Council of Canada and Natural Resources Canada, with
the support of the Canadian Space Agency. The National Solar Observatory
(NSO) data used for this work are produced cooperatively by National
Science Foundation (NSF) and the NSO. The NSO is operated by the
Association of Universities for Research in Astronomy (AURA), Inc.,
under cooperative agreement with the NSF.
NR 55
TC 17
Z9 18
U1 0
U2 4
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 1542-7390
J9 SPACE WEATHER
JI Space Weather
PD FEB 23
PY 2012
VL 10
AR S02011
DI 10.1029/2011SW000748
PG 9
WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology &
Atmospheric Sciences
SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology &
Atmospheric Sciences
GA 899NV
UT WOS:000300823800002
ER
PT J
AU Brown, KC
Perram, GP
AF Brown, Kirk C.
Perram, Glen P.
TI Spin-orbit relaxation and quenching of cesium 7 P-2 in mixtures of
helium, methane, and ethane
SO PHYSICAL REVIEW A
LA English
DT Article
ID EXCITED ALKALI ATOMS; EXCITATION TRANSFER; INELASTIC-COLLISIONS;
CROSS-SECTIONS; SENSITIZED FLUORESCENCE; TEMPERATURE-DEPENDENCE;
LIFETIME MEASUREMENTS; RUBIDIUM LASER; GAS ATOMS; STATES
AB The fine-structure mixing and quenching cross sections of the cesium 7 P-2 state inmixtures of helium, methane, and ethane were measured using laser-induced fluorescence techniques. This research was performed to study the kinetics associated with an optically pumped blue cesium laser operating on the 7(2)P(1/2)-6S(1/2) transition. Fluorescence decay curves from pulsed-laser experiments were analyzed as a function of buffer gas density at cell temperatures near 393 K. The fine-structure mixing cross sections for He, CH4, and C2H6 are 14 +/- 3, 35 +/- 6, and 73 +/- 10 angstrom(2), respectively. The P-2(3/2) state is quenched more rapidly than the P-2(1/2) state. A model that includes the effects of radiation trapping and independent quenching cross sections for each fine-structure sublevel is compared to the experimental data. The rapid quenching negatively impacts the performance of a recently demonstrated optically pumped blue laser. We compare the cross sections for alkali-metal and noble gases and extend the adiabaticity analysis to the higher-lying excited states.
C1 [Brown, Kirk C.; Perram, Glen P.] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
RP Perram, GP (reprint author), USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
EM glen.perram@afit.edu
OI Perram, Glen/0000-0002-4417-3929
NR 34
TC 2
Z9 2
U1 0
U2 13
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 2469-9926
EI 2469-9934
J9 PHYS REV A
JI Phys. Rev. A
PD FEB 23
PY 2012
VL 85
IS 2
AR 022713
DI 10.1103/PhysRevA.85.022713
PG 10
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 897NH
UT WOS:000300657100004
ER
PT J
AU Wang, Y
Urbas, A
Li, Q
AF Wang, Yan
Urbas, Augustine
Li, Quan
TI Reversible Visible-Light Tuning of Self-Organized Helical
Superstructures Enabled by Unprecedented Light-Driven Axially Chiral
Molecular Switches
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID CHOLESTERIC LIQUID-CRYSTALS; DISPLAY; GREEN; LASER; RED
AB Two enantiomeric light-driven azo molecular switches with axial chirality and extended conjugation were found to exhibit unprecedented reversible photo-isomerization in both organic-solvent and liquid-crystal media only upon visible-light irradiation. When doped in an achiral liquid crystal with a different concentration, the chiral switch was able either to immediately induce an optically tunable helical superstructure or to retain an achiral liquid-crystal phase whose helical superstructure was induced and tuned reversibly upon visible-light irradiation. Furthermore, reversible dynamic red, green, and blue reflection achieved only by using visible light was demonstrated.
C1 [Wang, Yan; Li, Quan] Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA.
[Urbas, Augustine] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Li, Q (reprint author), Kent State Univ, Inst Liquid Crystal, Kent, OH 44242 USA.
EM qli1@kent.edu
RI Wang, Yan/A-3347-2013
FU Air Force Office of Scientific Research (AFOSR) [FA9950-09-1-0193,
FA9550-09-1-0254]
FX This work was supported by the Air Force Office of Scientific Research
(AFOSR FA9950-09-1-0193 and FA9550-09-1-0254). We thank R S. Zola, Y.
Li, L. Jin, X. Ma, and C. Xue for discussions and characterization
assistance.
NR 29
TC 60
Z9 61
U1 4
U2 76
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0002-7863
J9 J AM CHEM SOC
JI J. Am. Chem. Soc.
PD FEB 22
PY 2012
VL 134
IS 7
BP 3342
EP 3345
DI 10.1021/ja211837f
PG 4
WC Chemistry, Multidisciplinary
SC Chemistry
GA 903AG
UT WOS:000301084700008
PM 22313230
ER
PT J
AU Yan, L
Wang, M
Raju, NP
Epstein, A
Tan, LS
Urbas, A
Chiang, LY
Hu, B
AF Yan, Liang
Wang, Min
Raju, N. P.
Epstein, Arthur
Tan, Loon-Seng
Urbas, Augustine
Chiang, Long Y.
Hu, Bin
TI Magnetocurrent of Charge-Polarizable C-60-Diphenylaminofluorene
Monoadduct-Derived Magnetic Nanocomposites
SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
LA English
DT Article
ID GIANT NEGATIVE MAGNETORESISTANCE; PI-D INTERACTION; ROOM-TEMPERATURE;
ORGANIC SEMICONDUCTORS; SANDWICH DEVICES; FIELD; DIPHENYLAMINOFLUORENE;
CONDUCTOR; ADDUCTS; SYSTEM
AB We demonstrated the strategy of a nanocomposite design by the incorporation of both a delocalized pi-electrons system in a closely bound acceptor-donor analogue chromophore, based on charge-polarizable C-60(>DPAF-C-9) nanostructure 1, and spin-polarized d-electrons in the form of gamma-FeOx nanoparticles. Facile intramolecular electron transfer from the DPAF-C-9 donor moiety to the C-60 acceptor cage of 1 upon activation to the excited state with a long lifetime of the charge-separated state forms a possible mechanism to integrate semiconducting and magnetic properties in a single system. We observed an appreciable magnetocurrent (MC) of C-60(>DPAF-C-9)-encapsulated magnetic gamma-FeOx nanoparticles in PMMA matrix upon applying a magnetic field from 0 to 300 mT at either 77K (12% MC) or 300 K (4.5% MC). Interestingly, the detailed analysis of magnetocurrent curve profiles taken at 77 K allowed us to conclude that the measured magnetocurrent may be attributed to the contributions from magnetic field-dependent excited-state populations in semiconducting structure (density-based MC), magnetism from magnetic structure (mobility-based MC), and product of density and mobility-based MC components (pi-d electronic coupling). At the higher temperature region up to 300 K, the semiconducting mechanism dominated the determining factor of measured magnetocurrent. This experimental observation indicated the feasibility of combining delocalized pi electrons and spin-polarized d electrons through charge transfer to induce internally coupled dual mobility- and density-based MC through the modulation of spin polarization and excited states in semiconducting/magnetic hybrid materials.
C1 [Wang, Min; Chiang, Long Y.] Univ Massachusetts, Inst Nanosci & Engn Technol, Dept Chem, Lowell, MA 01854 USA.
[Yan, Liang; Hu, Bin] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA.
[Raju, N. P.; Epstein, Arthur] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA.
[Tan, Loon-Seng; Urbas, Augustine] USAF, Res Lab, AFRL RXBN, Dayton, OH 45433 USA.
RP Chiang, LY (reprint author), Univ Massachusetts, Inst Nanosci & Engn Technol, Dept Chem, Lowell, MA 01854 USA.
EM long_chiang@uml.edu; bhu@utk.edu
RI Hu, Bin/A-2954-2015; Yan, Liang/H-6471-2011; Tan, Loon-Seng/F-6985-2012
OI Hu, Bin/0000-0002-1573-7625; Yan, Liang/0000-0003-4122-7466; Tan,
Loon-Seng/0000-0002-2134-9290
FU Air Force Office of Scientific Research (AFOSR) [FA9550-11-1-0082,
FA9550-09-1-0380]; NSF [ECCS-0644945]; Air Force Research Laboratory
(AFRL) [FA8650-09-D-5037-0006]
FX L.Y. and B.H. would like to acknowledge financial support from the Air
Force Office of Scientific Research (AFOSR) under grant number
FA9550-11-1-0082 and from the NSF under grant number ECCS-0644945. M.W.
and L.Y.C. are thankful for the financial support of AFOSR under grant
number FA9550-09-1-0380 and the Air Force Research Laboratory (AFRL)
under contract number FA8650-09-D-5037-0006.
NR 39
TC 9
Z9 9
U1 2
U2 39
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0002-7863
J9 J AM CHEM SOC
JI J. Am. Chem. Soc.
PD FEB 22
PY 2012
VL 134
IS 7
BP 3549
EP 3554
DI 10.1021/ja210812u
PG 6
WC Chemistry, Multidisciplinary
SC Chemistry
GA 903AG
UT WOS:000301084700031
PM 22324519
ER
PT J
AU Mertelj, A
Cmok, L
Copic, M
Cook, G
Evans, DR
AF Mertelj, Alenka
Cmok, Luka
Copic, Martin
Cook, Gary
Evans, Dean R.
TI Critical behavior of director fluctuations in suspensions of
ferroelectric nanoparticles in liquid crystals at the nematic to
smectic-A phase transition
SO PHYSICAL REVIEW E
LA English
DT Article
ID LIGHT-SCATTERING; DYNAMICS; SUPERCONDUCTORS; SN2P2S6
AB By dynamic light scattering we studied the temperature dependence of scattered intensities and relaxation rates for pure twist and pure bend modes in a colloidal system of BaTiO3 single domain nanoparticles and liquid crystal octylcyanobiphenyl (8CB) close to the nematic to smectic-A phase transition. From the experiments we obtained the critical exponents for the smectic correlation lengths, which in suspensions differ from the values for pure 8CB. The phase transition temperatures from isotropic to nematic phase (T-NI) and from nematic to smectic-A phase (T-NA) are both affected by the presence of the particles in two ways. The electric field around the ferroelectric particles increases the transition temperatures, whereas the disorder and probably also the excess of the surfactant cause a decrease of the transition temperatures compared to pure 8CB. The net effect is lower T-NI and almost unchanged T-NA in suspensions. After prolonged exposure to the external field the ferroelectric particles irreversibly aggregate, which results in the decrease of the internal electric field and, consequently, in the decrease of both transition temperatures.
C1 [Mertelj, Alenka; Cmok, Luka; Copic, Martin] J Stefan Inst, SI-1001 Ljubljana, Slovenia.
[Mertelj, Alenka; Copic, Martin] Univ Ljubljana, Dept Phys, SI-1000 Ljubljana, Slovenia.
[Cook, Gary] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Cook, Gary] Azimuth Corp, Dayton, OH 45433 USA.
RP Mertelj, A (reprint author), J Stefan Inst, Jamova Cesta 39, SI-1001 Ljubljana, Slovenia.
RI Mertelj, Alenka/C-6209-2011
OI Mertelj, Alenka/0000-0002-2766-9121
FU Ministry of Higher Education, Science and Technology of Slovenia
[P1-0192]
FX M.C., L.C., and A.M. acknowledge support from the Ministry of Higher
Education, Science and Technology of Slovenia (Grant No. P1-0192). The
authors thank Dr. Sergey Basun for stimulating discussions.
NR 35
TC 7
Z9 7
U1 1
U2 11
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1539-3755
J9 PHYS REV E
JI Phys. Rev. E
PD FEB 21
PY 2012
VL 85
IS 2
AR 021705
DI 10.1103/PhysRevE.85.021705
PN 1
PG 7
WC Physics, Fluids & Plasmas; Physics, Mathematical
SC Physics
GA 896MU
UT WOS:000300572000012
PM 22463229
ER
PT J
AU Shi, Y
Zesta, E
Lyons, LR
Yang, J
Boudouridis, A
Ge, YS
Ruohoniemi, JM
Mende, S
AF Shi, Yong
Zesta, Eftyhia
Lyons, Larry R.
Yang, J.
Boudouridis, A.
Ge, Y. S.
Ruohoniemi, J. M.
Mende, S.
TI Two-dimensional ionospheric flow pattern associated with auroral
streamers
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID BURSTY BULK FLOWS; POLEWARD BOUNDARY INTENSIFICATIONS; HIGH-SPEED FLOWS;
PLASMA SHEET; INNER MAGNETOTAIL; IMAGE FUV; SIGNATURES; PRECIPITATION;
CONVECTION; INJECTIONS
AB We present direct two-dimensional flow observations and auroral images from the Super Dual Auroral Radar Network (SuperDARN) radar and Wideband Imaging Camera onboard Imager for Magnetopause-to-Aurora Global Exploration (IMAGE/WIC) imager to investigate the ionospheric flow pattern associated with auroral streamers for four events. Using the SuperDARN observations allows us to observe the flow associated with the streamers in the context of the larger-scale background convection. For all four cases studied, streamers developed from preexisting east-west (EW) arcs that initiated from bead-like or small-scale auroral intensifications around the auroral poleward boundary. We find a vortex-like flow pattern with clockwise sense surrounding both the initial auroral forms and the ensuing streamers. We also found in three cases signatures of flow bifurcations at the equatorward end of the streamers, which suggests a double vortex-like flow pattern with the counterclockwise vortex east of the clockwise one. Our results are consistent with the double-vortex flow structure that results from interchange convection associated with a plasma sheet bubble predicted by different numerical simulations. This supports several previous studies and offers more complete observational evidence that the observed flow pattern may be the ionospheric manifestation of interchange instability in the plasma sheet.
C1 [Shi, Yong; Lyons, Larry R.] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA 90095 USA.
[Zesta, Eftyhia] USAF, Res Lab RVBXP, Kirtland AFB, NM 87117 USA.
[Boudouridis, A.] Space Sci Inst, Boulder, CO 80301 USA.
[Ge, Y. S.] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA.
[Mende, S.] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA.
[Ruohoniemi, J. M.] Virginia Polytech Inst & State Univ, Bradley Dept Elect & Comp Engn, Blacksburg, VA 24061 USA.
[Yang, J.] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA.
RP Shi, Y (reprint author), Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, 405 Hilgard Ave, Los Angeles, CA 90095 USA.
EM yongshi@atmos.ucla.edu
RI Yang, Jian/F-1903-2017
OI Yang, Jian/0000-0002-4788-8823
FU National Science Foundation [ATM-0639312, ATM-0646233, AGS-0849031];
NASA [NNX09AI06G, NNX10AL30G, NNG05GE24G, NNH09AL23I, NNX08AI55G,
NNX10AQ43G, NNX08AM46G, NNX11AE43G]
FX This work was supported in part at UCLA by National Science Foundation
grants ATM-0639312 and ATM-0646233 and NASA grants NNX09AI06G,
NNX10AL30G, and NNG05GE24G. At AFRL the work was supported in part by
NASA grant NNH09AL23I. The work at Rice was supported by NASA
Heliophysics Theory grant NNX08AI55G and NASA Guest Investigator grant
NNX10AQ43G. A.B. acknowledges the support of NASA grants NNX08AM46G and
NNX11AE43G. The authors are grateful to the PIs of the SuperDARN radars
and for the support of their national funding agencies. J.M.R.
acknowledges the support of the National Science Foundation grant
AGS-0849031.
NR 32
TC 15
Z9 15
U1 1
U2 5
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD FEB 18
PY 2012
VL 117
AR A02208
DI 10.1029/2011JA017110
PG 11
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 899OP
UT WOS:000300825900002
ER
PT J
AU Hu, MQ
Weir, JD
Wu, T
AF Hu, Mengqi
Weir, Jeffery D.
Wu, Teresa
TI Decentralized operation strategies for an integrated building energy
system using a memetic algorithm
SO EUROPEAN JOURNAL OF OPERATIONAL RESEARCH
LA English
DT Article
DE OR in energy; Net-zero; Smart grid; Pareto optimality; Memetic algorithm
ID THERMAL STORAGE INVENTORY; REINFORCEMENT LEARNING CONTROL; GENETIC
ALGORITHM; COMBINED HEAT; OPTIMIZATION; UNCERTAINTY; DESIGN;
PERFORMANCE; ELECTRICITY; MANAGEMENT
AB The emerging technology in net-zero building and smart grids drives research moving from centralized operation decisions on a single building to decentralized decisions on a group of buildings, termed a building cluster which shares energy resources locally and globally. However, current research has focused on developing an accurate simulation of single building energy usage which limits its application to building clusters as scenarios such as energy sharing and competition cannot be modeled and studied. We hypothesize that the study of energy usage for a group of buildings instead of one single building will result in a cost effective building system which in turn will be resilient to power disruption. To this end, this paper develops a decision model based on a building cluster simulator with each building modeled by energy consumption, storage and generation sub modules. Assuming each building is interested in minimizing its energy cost, a bi-level operation decision framework based on a memetic algorithm is proposed to study the tradeoff in energy usage among the group of buildings. Two additional metrics, measuring the comfort level and the degree of dependencies on the power grid are introduced for the analysis. The experimental result demonstrates that the proposed framework is capable of deriving the Pareto solutions for the building cluster in a decentralized manner. The Pareto solutions not only enable multiple dimensional tradeoff analysis, but also provide valuable insight for determining pricing mechanisms and power grid capacity. (C) 2011 Elsevier B.V. All rights reserved.
C1 [Hu, Mengqi; Wu, Teresa] Arizona State Univ, Sch Comp, Tempe, AZ 85287 USA.
[Weir, Jeffery D.] USAF, Dept Operat Sci, Grad Sch Engn & Management, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Wu, T (reprint author), Arizona State Univ, Sch Comp, Tempe, AZ 85287 USA.
EM Teresa.Wu@asu.edu
RI Hu, Mengqi/A-2900-2013
OI Hu, Mengqi/0000-0002-8653-1245
NR 52
TC 20
Z9 20
U1 1
U2 18
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0377-2217
J9 EUR J OPER RES
JI Eur. J. Oper. Res.
PD FEB 16
PY 2012
VL 217
IS 1
BP 185
EP 197
DI 10.1016/j.ejor.2011.09.008
PG 13
WC Management; Operations Research & Management Science
SC Business & Economics; Operations Research & Management Science
GA 858DU
UT WOS:000297776900018
ER
PT J
AU Bouvier, S
Benmhenni, N
Tirry, W
Gregory, F
Nixon, ME
Cazacu, O
Rabet, L
AF Bouvier, S.
Benmhenni, N.
Tirry, W.
Gregory, F.
Nixon, M. E.
Cazacu, O.
Rabet, L.
TI Hardening in relation with microstructure evolution of high purity
a-titanium deformed under monotonic and cyclic simple shear loadings at
room temperature
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE High purity titanium; Simple shear; Grain fragmentation; Twinning;
Hardening; EBSD
ID DUAL-PHASE STEEL; PLASTIC ANISOTROPY; TEXTURE EVOLUTION; ROLLED SHEETS;
DEFORMATION; STRAIN; BEHAVIOR; TESTS
AB The aim of this paper is to gain understanding of the quasi-static, large strain deformation behavior at room-temperature of high-purity alpha-Ti with an initial split-basal texture. Simple shear tests were conducted along different directions in order to quantify the material's anisotropy and hardening evolution for different strain paths such as monotonic, Bauschinger, and cyclic loadings. The stress-strain curves indicate that the material displays strong anisotropy in the flow behavior. In order to capture the link between microstructure evolution (occurrence of twinning, grain size evolution, etc.) and the macroscopic response, a thoroughly detailed multi-scale characterization using scanning electron microscope (SEM) observations and electron backscattered diffraction (EBSD) analysis was also conducted. Specifically, EBSD analyses indicate that the twin activity and grain fragmentation are responsible for the observed difference between the macroscopic hardening rates corresponding to different directions and loading paths. (C) 2011 Elsevier B.V. All rights reserved.
C1 [Bouvier, S.; Benmhenni, N.; Gregory, F.] Univ Paris 13, LSPM CNRS, UPR3407, F-93430 Villetaneuse, France.
[Tirry, W.; Rabet, L.] Royal Mil Acad, B-1000 Brussels, Belgium.
[Tirry, W.] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium.
[Nixon, M. E.] USAF, Res Lab, Eglin, FL 32579 USA.
[Cazacu, O.] Univ Florida, Dept Mech & Aerosp Engn, REEF, Shalimar, FL 32539 USA.
RP Bouvier, S (reprint author), Univ Technol Compiegne, Lab Roberval, CNRS, UMR 6253, Rue Personne Roberval, F-60205 Compiegne, France.
EM salima.bouvier@utc.fr
RI Cazacu, Oana/L-4635-2016
OI Cazacu, Oana/0000-0002-2499-9096
FU U.S. Air Force through European Office of Aerospace Research and
Development [FA8655-07-M-4013]; Belgian Science Policy [P6/24]
FX The authors gratefully acknowledge R. Chiron, LPMTM, University Paris
13, France for his help in using SEM observation. S. Bouvier gratefully
acknowledges the support for this work provided by U.S. Air Force
through European Office of Aerospace Research and Development, Grant
FA8655-07-M-4013. This work was also funded by the Inter University
Attraction Poles Program (Belgian Science Policy) under contract number
P6/24.
NR 17
TC 12
Z9 12
U1 0
U2 16
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD FEB 15
PY 2012
VL 535
BP 12
EP 21
DI 10.1016/j.msea.2011.12.033
PG 10
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 907FE
UT WOS:000301402400003
ER
PT J
AU Shade, PA
Uchic, MD
Dimiduk, DM
Viswanathan, GB
Wheeler, R
Fraser, HL
AF Shade, P. A.
Uchic, M. D.
Dimiduk, D. M.
Viswanathan, G. B.
Wheeler, R.
Fraser, H. L.
TI Size-affected single-slip behavior of Rene N5 microcrystals
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Size effect; Microcompression; Nickel-based superalloys
ID DISCRETE DISLOCATION SIMULATIONS; NICKEL-BASE SUPERALLOYS; UNIAXIAL
COMPRESSION; MICRON-SCALE; MECHANICAL-PROPERTIES; PLASTICITY; CRYSTALS;
STRENGTH; DEFORMATION; PILLARS
AB Microcompression testing was conducted on the cast single crystal nickel-base superalloy Rene N5. Microcrystals were selectively fabricated from either dendrite core or interdendritic regions. The compression axis was oriented for single-slip deformation and microcrystal diameters ranged from 2.5 to 80 mu m. All microcrystals displayed several hallmarks of size-affected plastic flow, including a size-affected and stochastic flow-stress and initial strain hardening rate, as well as an intermittent flow response. The magnitude of size-affected flow-stress scaling behavior was dependent upon the plastic strain level of the flow-stress measurement, with increasing size-dependence for increasing strain levels. TEM analysis demonstrated the activation of multiple slip-systems, despite the microcrystals being oriented for single-slip deformation. Zig-zag slip was also observed in microcrystals that achieved flow stresses of 1300 MPa or higher. For microcrystals fabricated within interdendritic regions the flow-stress values are, on average, lower compared to dendrite core microcrystals. This difference in flow-stress is especially pronounced for microcrystals which are 5 mu m in diameter. The microcrystal diameter for which bulk-like properties are estimated to be observed is approximately 350 mu m, which is approaching the measured primary dendrite arm spacing for this crystal (430 mu m). Published by Elsevier B.V.
C1 [Shade, P. A.; Uchic, M. D.; Dimiduk, D. M.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Shade, P. A.; Fraser, H. L.] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA.
[Viswanathan, G. B.; Wheeler, R.] UES Inc, Dayton, OH 45432 USA.
RP Shade, PA (reprint author), USAF, Res Lab, Mat & Mfg Directorate, 2230 10th St, Wright Patterson AFB, OH 45433 USA.
EM paul.shade@wpafb.af.mil
RI Shade, Paul/H-6459-2011
FU Air Force Office of Scientific Research and the Materials &
Manufacturing Directorate of the Air Force Research Laboratory
FX The authors gratefully acknowledge A.L. Smith for assisting with
specimen fabrication and mechanical testing and F. Meisenkothen for
assisting with EPMA measurements. We also acknowledge useful discussions
with S.I. Rao and T.F. Broderick. The Rene N5 crystal studied in this
work was provided by J. Rigney of GE Aviation. The authors acknowledge
support from the Air Force Office of Scientific Research and the
Materials & Manufacturing Directorate of the Air Force Research
Laboratory.
NR 46
TC 12
Z9 12
U1 3
U2 33
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD FEB 15
PY 2012
VL 535
BP 53
EP 61
DI 10.1016/j.msea.2011.12.041
PG 9
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 907FE
UT WOS:000301402400008
ER
PT J
AU Mancuso, JD
Mazurek, GH
Tribble, D
Olsen, C
Aronson, NE
Geiter, L
Goodwin, D
Keep, LW
AF Mancuso, James D.
Mazurek, Gerald H.
Tribble, David
Olsen, Cara
Aronson, Naomi E.
Geiter, Lawrence
Goodwin, Donald
Keep, Lisa W.
TI Discordance among Commercially Available Diagnostics for Latent
Tuberculosis Infection
SO AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE
LA English
DT Article
DE tuberculosis screening; interferon-gamma release assays; nontuberculous
mycobacteria
ID GAMMA RELEASE ASSAYS; RISK ASSESSMENT QUESTIONNAIRE; SKIN-TEST ANTIGENS;
MYCOBACTERIUM-TUBERCULOSIS; UNITED-STATES; CHILDREN; TESTS; PREVALENCE;
DISEASE; TB
AB Rationale: There is uncertainty regarding how to interpret discordance between tests for latent tuberculosis infection.
Objectives: The objective of this study was to assess discordance between commercially available tests for latent tuberculosis in a low-prevalence population, including the impact of nontuberculous mycobacteria.
Methods: This was a cross-sectional comparison study among 2,017 military recruits at Fort Jackson, South Carolina, from April to June 2009. Several tests were performed simultaneously with a risk factor questionnaire, including (1) QuantiFERON-TB Gold In-Tube test, (2) T-SPOT. TB test, (3) tuberculin skin test, and (4) Battey skin test using purified protein derivative from the Battey bacillus.
Measurements and Main Results: In this low-prevalence population, the specificities of the three commercially available diagnostic tests were not significantly different. Of the 88 subjects with a positive test, only 10 (11.4%) were positive to all three tests; 20 (22.7%) were positive to at least two tests. Bacille Calmette-Guerin vaccination, tuberculosis prevalence in country of birth, and Battey skin test reaction size were associated with tuberculin skin test-positive, IFN-gamma release assay-negative test discordance. Increasing agreement between the three tests was associated with epidemiologic criteria indicating risk of infection and with quantitative test results.
Conclusions: For most positive results the three tests identified different people, suggesting that in low-prevalence populations most discordant results are caused by false-positives. False-positive tuberculin skin test reactions associated with reactivity to nontuberculous mycobacteria and bacille Calmette-Guerin vaccination may account for a proportion of test discordance observed.
C1 [Mancuso, James D.] Walter Reed Army Inst Res, Prevent Med Residency Program, Div Prevent Med, Silver Spring, MD 20910 USA.
[Mazurek, Gerald H.] Ctr Dis Control & Prevent, Div TB Eliminat, Atlanta, GA USA.
[Mancuso, James D.; Tribble, David; Olsen, Cara; Keep, Lisa W.] Uniformed Serv Univ Hlth Sci, Dept Prevent Med & Biometr, Bethesda, MD 20814 USA.
[Aronson, Naomi E.] Uniformed Serv Univ Hlth Sci, Dept Med, Bethesda, MD 20814 USA.
[Geiter, Lawrence] Otsuka Pharmaceut Co Ltd, TB Prod Unit, Rockville, MD USA.
[Goodwin, Donald] USAF, Sch Aerosp Med, Wright Patterson AFB, OH 45433 USA.
RP Mancuso, JD (reprint author), Walter Reed Army Inst Res, Prevent Med Residency Program, Div Prevent Med, 503 Robert Grant Rd, Silver Spring, MD 20910 USA.
EM james.mancuso@us.army.mil
FU Department of Defense through the Uniformed Services University of the
Health Sciences; National Institute of Allergy and Infectious Diseases,
National Institutes of Health (NIH) [Y1-AI-5072]
FX Supported by the Infectious Disease Clinical Research Program, a
Department of Defense program executed through the Uniformed Services
University of the Health Sciences. This project has been funded in
whole, or in part, with federal funds from the National Institute of
Allergy and Infectious Diseases, National Institutes of Health (NIH),
under Inter-Agency Agreement Y1-AI-5072. The content of this publication
is the sole responsibility of the authors and does not necessarily
reflect the views or policies of the NIH, the Department of Health and
Human Services, the Centers for Disease Control and Prevention, the
Department of Defense, or the Departments of the Army, Navy, or Air
Force. Mention of trade names, commercial products, or organizations
does not imply endorsement by the US Government. The Infectious Disease
Clinical Research Program (Bethesda, MD) participated in all phases of
the study, including design and conduct of the study; collection,
management, analysis, and interpretation of the data; and preparation,
review, or approval of the manuscript. Oxford Immunotec (Marlborough,
MA) performed T-Spot testing (masked) as an in-kind contribution, but
played no other role in the design, conduct, collection, management,
analysis, interpretation of the data, preparation, review, or approval
of the manuscript. Laboratory and technical support was also provided by
the US Air Force School of Aerospace Medicine and the Centers for
Disease Control and Prevention's Division of TB Elimination.
NR 45
TC 31
Z9 32
U1 0
U2 3
PU AMER THORACIC SOC
PI NEW YORK
PA 61 BROADWAY, FL 4, NEW YORK, NY 10006 USA
SN 1073-449X
J9 AM J RESP CRIT CARE
JI Am. J. Respir. Crit. Care Med.
PD FEB 15
PY 2012
VL 185
IS 4
BP 427
EP 434
DI 10.1164/rccm.201107-1244OC
PG 8
WC Critical Care Medicine; Respiratory System
SC General & Internal Medicine; Respiratory System
GA 897EY
UT WOS:000300629900015
PM 22161162
ER
PT J
AU Chen, WB
Nelson, RL
Zhan, QW
AF Chen, Weibin
Nelson, Robert L.
Zhan, Qiwen
TI Geometrical phase and surface plasmon focusing with azimuthal
polarization
SO OPTICS LETTERS
LA English
DT Article
ID EVANESCENT BESSEL BEAM; LENS; ANALYZER
AB Owing to a geometric phase effect, an isosceles triangular aperture etched into thin metal film leads to constructive or destructive interference of surface plasmons excited at the two equal sides under linearly polarized illumination. Through appropriate spatial arrangement of an array of triangles, a highly confined focal spot beyond the diffraction limit can be achieved at the geometric center under azimuthally polarized excitation with field enhancement comparable to a bull's eye plasmonic lens under radially polarized illumination. Through simply rotating the orientation of each triangle aperture by 90 degrees, the plasmonic structure defocuses the same azimuthal polarization illumination due to destructive interference caused by a geometric pi-phase difference between the two sides of the triangle and between the adjacent triangles. (C) 2012 Optical Society of America
C1 [Chen, Weibin; Zhan, Qiwen] Univ Dayton, Electroopt Program, Dayton, OH 45469 USA.
[Nelson, Robert L.] USAF, Res Lab, Dayton, OH 45433 USA.
RP Chen, WB (reprint author), Univ Dayton, Electroopt Program, 300 Coll Pk, Dayton, OH 45469 USA.
EM wchen2@udayton.edu
RI Chen, Weibin/E-9510-2010
FU U.S. Air Force Research Laboratories
FX The authors thankfully acknowledge support from the U.S. Air Force
Research Laboratories through the Metamaterials Program.
NR 11
TC 15
Z9 15
U1 2
U2 36
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 0146-9592
J9 OPT LETT
JI Opt. Lett.
PD FEB 15
PY 2012
VL 37
IS 4
BP 581
EP 583
PG 3
WC Optics
SC Optics
GA 898AF
UT WOS:000300706500046
PM 22344113
ER
PT J
AU Schaeublin, NM
Braydich-Stolle, LK
Maurer, EI
Park, K
MacCuspie, RI
Afrooz, ARMN
Vaia, RA
Saleh, NB
Hussain, SM
AF Schaeublin, Nicole M.
Braydich-Stolle, Laura K.
Maurer, Elizabeth I.
Park, Kyoungweon
MacCuspie, Robert I.
Afrooz, A. R. M. Nabiul
Vaia, Richard A.
Saleh, Navid B.
Hussain, Saber M.
TI Does Shape Matter? Bioeffects of Gold Nanomaterials in a Human Skin Cell
Model
SO LANGMUIR
LA English
DT Article
ID IN-VITRO CYTOTOXICITY; PEG CHAIN-LENGTH; SURFACE-CHEMISTRY; NANOPARTICLE
AGGREGATION; MAMMALIAN-CELLS; BRAIN MICROGLIA; PROTEIN CORONA;
DNA-DAMAGE; NANORODS; SIZE
AB Gold nanomaterials (AuNMs) have distinctive electronic and optical properties, making them ideal candidates for biological, medical, and defense applications. Therefore, it is imperative to evaluate the potential biological impact of AuNMs before employing them in any application. This study investigates two AuNMs with different aspect ratios (AR) on mediation of biological responses in the human keratinocyte cell line (HaCaT) to model potential skin exposure to these AuNMs. The cellular responses were evaluated by cell viability, reactive oxygen species (ROS) generation, alteration in gene and protein expression, and inflammatory response. Gold nanospheres, nominally 20 nm in diameter and coated with mercaptopropane sulfonate (AuNS-MPS), formed agglomerates when dispersed in cell culture media, had a large fractal dimension (D-f = 2.57 +/- 0.4) (i.e., tightly bound and densely packed) and were found to be nontoxic even at the highest dose of 100 mu g/mL. Highly uniform, 16.7 nm diameter, and 43.8 nm long polyethylene glycol-capped gold nanorods (AuNR-PEG) also formed agglomerates when dispersed into the cell culture media. However, the agglomerates had a smaller fractal dimension (D-f = 1.28 +/- 0.08) (i.e., loosely bound) and were found to be cytotoxic to the HaCaT cells, with a significant decrease in cell viability occurring at 25 mu g/mL and higher. Moreover, AuNR-PEG caused significant ROS production and up-regulated several genes involved in cellular stress and toxicity. These results, combined with increased levels of inflammatory and apoptotic proteins, demonstrated that the AuNR-PEG induced apoptosis. Exposure to AuNS-MPS, however, did not show any of the detrimental effects observed from the AuNR-PEG. Therefore, we conclude that shape appears to play a key role in mediating the cellular response to AuNMs.
C1 [Schaeublin, Nicole M.; Braydich-Stolle, Laura K.; Maurer, Elizabeth I.; Hussain, Saber M.] USAF, Appl Biotechnol Branch, Human Effectiveness Directorate, Res Lab, Dayton, OH 45431 USA.
[Park, Kyoungweon; Vaia, Richard A.] USAF, Mat & Mfg Directorate, Res Lab, Dayton, OH 45431 USA.
[MacCuspie, Robert I.] NIST, Div Ceram, Mat Measurement Lab, Gaithersburg, MD 20899 USA.
[Afrooz, A. R. M. Nabiul; Saleh, Navid B.] Univ S Carolina, Columbia, SC 29208 USA.
RP Hussain, SM (reprint author), USAF, Appl Biotechnol Branch, Human Effectiveness Directorate, Res Lab, 711 Human Performance Wing, Dayton, OH 45431 USA.
EM saber.hussain@wpafb.af.mil
OI Afrooz, ARM/0000-0002-9141-9426; MacCuspie, Robert/0000-0002-6618-6499
FU AFSG; Henry M. Jackson Foundation
FX The authors thank Ms. Constance Estep for help with the viability assay,
Dr. Amanda Schrand for TEM imaging and EDAX, and Dr. Kristen Comfort for
her assistance with critical and constructive criticism. This work was
supported through AFSG funding. Ms. Schaeublin, Dr. Braydich-Stolle, and
Ms. Maurer are funded through the Henry M. Jackson Foundation.
NR 75
TC 53
Z9 53
U1 1
U2 66
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0743-7463
J9 LANGMUIR
JI Langmuir
PD FEB 14
PY 2012
VL 28
IS 6
BP 3248
EP 3258
DI 10.1021/la204081m
PG 11
WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science,
Multidisciplinary
SC Chemistry; Materials Science
GA 890IO
UT WOS:000300138500025
PM 22242624
ER
PT J
AU Wang, W
Wu, SM
Knize, RJ
Reinhardt, K
Lu, YL
Chen, SC
AF Wang, Wei
Wu, Shaomin
Knize, Randy J.
Reinhardt, Kitt
Lu, Yalin
Chen, Shaochen
TI Enhanced photon absorption and carrier generation in nanowire solar
cells
SO OPTICS EXPRESS
LA English
DT Article
ID SUBWAVELENGTH HOLE ARRAYS; LIGHT-ABSORPTION; OPTICAL-TRANSMISSION;
WAVE-GUIDE; ABSORBERS; DESIGN
AB Overall performance of a thin film solar cell is determined by the efficiency of converting photons to electrons through light absorption, carrier generation, and carrier collection. Recently, photon management has emerged as a powerful tool to further boost this conversion efficiency. Here we propose a novel nanograting solar cell design that achieves enhanced broadband light absorption and carrier generation in conjunction with the reduced use of active and non-earth-abundant materials. A test using this design for the short circuit current density in CuInxGa(1-x)Se2 (CIGS) thin film solar cells shows up to 250% enhancement when compared to the bare thin film cells. In addition, placing metal strips on top of the nanograting to act as the top electrode reduces the use of non-earth-abundant materials that is normally used as the transparent conducting materials. This novel solar cell design has the potential to become a new solar cell platform technology for various thin film solar cell systems. (C) 2012 Optical Society of America
C1 [Wang, Wei; Lu, Yalin] Univ Sci & Technol China, HeFei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China.
[Wang, Wei] Guotai Junan Secur Co Ltd, Shanghai 200120, Peoples R China.
[Wu, Shaomin] Spansion Inc, Austin, TX 78741 USA.
[Knize, Randy J.; Lu, Yalin] USAF Acad, Dept Phys, Laser Opt Res Ctr, Colorado Springs, CO 80840 USA.
[Reinhardt, Kitt] USAF, Off Sci Res, AFOSR NE, Arlington, VA 22203 USA.
[Chen, Shaochen] Univ Calif San Diego, Dept NanoEngn, La Jolla, CA 92093 USA.
RP Wang, W (reprint author), Univ Sci & Technol China, HeFei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China.
EM yllu@ustc.edu.cn; chen168@ucsd.edu
FU US National Science Foundation [CMMI 1109591]; National Basic Research
Program of China [2012CB922001]; Air Force Office of Scientific Research
(AFOSR)
FX Financial support from the US National Science Foundation (CMMI
1109591), the National Basic Research Program of China (2012CB922001),
and the Air Force Office of Scientific Research (AFOSR) is greatly
appreciated. The authors are grateful for the computer support from
Intel's Higher Education Program.
NR 35
TC 10
Z9 10
U1 1
U2 23
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD FEB 13
PY 2012
VL 20
IS 4
BP 3733
EP 3743
DI 10.1364/OE.20.003733
PG 11
WC Optics
SC Optics
GA 902MH
UT WOS:000301041900037
PM 22418131
ER
PT J
AU Soref, R
Hendrickson, J
Cleary, JW
AF Soref, Richard
Hendrickson, Joshua
Cleary, Justin W.
TI Mid- to long-wavelength infrared plasmonic-photonics using heavily doped
n-Ge/Ge and n-GeSn/GeSn heterostructures
SO OPTICS EXPRESS
LA English
DT Article
ID SILICON; SILICIDES
AB Heavily doped n-type Ge and GeSn are investigated as plasmonic conductors for integration with undoped dielectrics of Si, SiGe, Ge, and GeSn in order to create a foundry-based group IV plasmonics technology. N-type Ge1-xSnx with compositions of 0 <= x <= 0.115 are investigated utilizing effective-mass theory and Drude considerations. The plasma wavelengths, relaxation times, and complex permittivities are determined as functions of the free carrier concentration over the range of 10(19) to 10(21) cm(-3). Basic plasmonic properties such as propagation loss and mode height are calculated and example numerical simulations are shown of a dielectric-conductor-dielectric ribbon waveguide structure are shown. Practical operation in the 2 to 20 mu m wavelength range is predicted. (C) 2012 Optical Society of America
C1 [Soref, Richard] Univ Massachusetts, Dept Phys, Boston, MA 02125 USA.
[Soref, Richard] Univ Massachusetts, Engn Program, Boston, MA 02125 USA.
[Hendrickson, Joshua; Cleary, Justin W.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Soref, R (reprint author), Univ Massachusetts, Dept Phys, 100 Morrissey Blvd, Boston, MA 02125 USA.
EM soref@rcn.com
FU Air Force Office of Scientific Research [FA9550-10-1-0417]; LRIR
[09RY01COR, 12RY10COR]
FX This work is supported in part by the Air Force Office of Scientific
Research, Gernot Pomrenke, Program Manager, under Grant Number
FA9550-10-1-0417 and LRIR award numbers 09RY01COR and 12RY10COR.
NR 19
TC 35
Z9 35
U1 2
U2 34
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD FEB 13
PY 2012
VL 20
IS 4
BP 3814
EP 3824
DI 10.1364/OE.20.003814
PG 11
WC Optics
SC Optics
GA 902MH
UT WOS:000301041900044
PM 22418138
ER
PT J
AU Joshi, A
Haynes, ND
Zelmon, DE
Stafsudd, O
Shori, R
AF Joshi, A.
Haynes, N. D.
Zelmon, D. E.
Stafsudd, O.
Shori, R.
TI Impurity concentration and temperature dependence of the refractive
indices of Er3+ doped ceramic Y2O3
SO OPTICS EXPRESS
LA English
DT Article
ID TRANSPARENT YTTRIA; LASER
AB The refractive indices and thermo-optic coefficients for varying concentrations of Er3+ doped polycrystalline yttria were measured at a variety of wavelengths and temperatures. A Lorenz oscillator model was employed to model the room temperature indices and thermo-optic coefficients were calculated based on temperature dependent index measurements from 0.45 to 1.064 microns. Some consequences relating to thermal lensing are discussed. (C)2012 Optical Society of America
C1 [Joshi, A.; Stafsudd, O.; Shori, R.] Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA.
[Haynes, N. D.; Zelmon, D. E.] USAF, Res Lab, AFRL RXPS, Wright Patterson AFB, OH 45433 USA.
[Shori, R.] USN, Air Warfare Ctr, China Lake, CA USA.
RP Joshi, A (reprint author), Univ Calif Los Angeles, Dept Elect Engn, Los Angeles, CA 90095 USA.
EM david.zelmon@wpafb.af.mil
NR 16
TC 4
Z9 4
U1 2
U2 14
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD FEB 13
PY 2012
VL 20
IS 4
BP 4428
EP 4435
DI 10.1364/OE.20.004428
PG 8
WC Optics
SC Optics
GA 902MH
UT WOS:000301041900108
PM 22418202
ER
PT J
AU Kousalya, AS
Hunter, CN
Putnam, SA
Miller, T
Fisher, TS
AF Kousalya, Arun S.
Hunter, Chad N.
Putnam, Shawn A.
Miller, Timothy
Fisher, Timothy S.
TI Photonically enhanced flow boiling in a channel coated with carbon
nanotubes
SO APPLIED PHYSICS LETTERS
LA English
DT Article
ID SURFACE; IGNITION; ARRAYS
AB High heat dissipation rates are enabled by multi-phase cooling schemes owing to latent heat uptake. We demonstrate enhanced flow boiling from a carbon nanotube (CNT)-coated copper surface exposed to low-intensity ultraviolet (UV)-visible excitation. Compared to non-illuminated results, the average boiling incipience temperature decreased by 4.6 degrees C and heat transfer coefficients improved by 41.5% with light exposure. These improved results are attributed to augmented hydrophilicity upon exposure to UV light and possible nanoscale opto-thermal effects, and suggest opportunities for active temperature control of temperature-sensitive devices. (C) 2012 American Institute of Physics. [doi:10.1063/1.3681594]
C1 [Kousalya, Arun S.; Miller, Timothy; Fisher, Timothy S.] Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
[Kousalya, Arun S.; Fisher, Timothy S.] Purdue Univ, Sch Mech Engn, W Lafayette, IN 47907 USA.
[Hunter, Chad N.; Putnam, Shawn A.; Fisher, Timothy S.] USAF, Thermal Sci & Mat Branch, Res Lab, Dayton, OH 45433 USA.
[Putnam, Shawn A.] Universal Technol Corp, Dayton, OH 45434 USA.
RP Kousalya, AS (reprint author), Purdue Univ, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
EM tsfisher@purdue.edu
RI Fisher, Timothy/D-8517-2011
OI Fisher, Timothy/0000-0002-8909-313X
FU U.S. Air Force Office of Scientific Research, Thermal Sciences
FX Funding from the U.S. Air Force Office of Scientific Research, Thermal
Sciences (Program Manager: Dr. Kumar Jata) is gratefully acknowledged.
NR 23
TC 14
Z9 14
U1 0
U2 11
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD FEB 13
PY 2012
VL 100
IS 7
AR 071601
DI 10.1063/1.3681594
PG 4
WC Physics, Applied
SC Physics
GA 894OR
UT WOS:000300436800012
ER
PT J
AU Poulson, RS
Gadbury, GL
Allison, DB
AF Poulson, Robert S.
Gadbury, Gary L.
Allison, David B.
TI Treatment Heterogeneity and Individual Qualitative Interaction
SO AMERICAN STATISTICIAN
LA English
DT Article
DE Causation; Cross-over interaction; Individual effects; Potential
outcomes; Probability of similar response; Subject-treatment interaction
ID BY-FORMULATION INTERACTION; CLINICAL-TRIALS; PATIENT SUBSETS; BIAS;
BIOEQUIVALENCE; STATISTICS; INFERENCE; MEDICINE; OVERLAP
AB Plausibility of high variability in treatment effects across individuals has been recognized as an important consideration in clinical studies. Surprisingly, little attention has been given to evaluating this variability in design of clinical trials or analyses of resulting data. High variation in a treatment's efficacy or safety across individuals (referred to herein as treatment heterogeneity) may have important consequences because the optimal treatment choice for an individual may be different from that suggested by a study of average effects. We call this an individual qualitative interaction (IQI), borrowing terminology from earlier work-referring to a qualitative interaction (QI) being present when the optimal treatment varies across "groups" of individuals. At least three techniques have been proposed to investigate treatment heterogeneity: techniques to detect a QI, use of measures such as the density overlap of two outcome variables under different treatments, and use of cross-over designs to observe "individual effects." We elucidate underlying connections among them, their limitations, and some assumptions that may be required. We do so under a potential outcomes framework that can add insights to results from usual data analyses and to study design features that improve the capability to more directly assess treatment heterogeneity.
C1 [Poulson, Robert S.] Edwards AFB, Stat Methods Grp, Edwards AFB, CA 93524 USA.
[Gadbury, Gary L.] Kansas State Univ, Dept Stat, Manhattan, KS 66506 USA.
[Allison, David B.] Univ Alabama Birmingham, Dept Biostat, Sect Stat Genet, Birmingham, AL 35294 USA.
RP Poulson, RS (reprint author), Edwards AFB, Stat Methods Grp, Edwards AFB, CA 93524 USA.
EM robert.poulson@edwards.af.mil; gadbury@ksu.edu; dallison@uab.edu
OI Allison, David/0000-0003-3566-9399
FU Air Force Flight Test Center [AFFTC-PA-11318]; NIH [R01DK078826]
FX Robert S. Poulson is a Mathematical Statistician in the Statistical
Methods Group at Edwards AFB, Edwards, CA 93524 (E-mail:
robert.poulson@edwards.af.mil). Dr. Poulson acknowledges support from
the Air Force Flight Test Center (approved for public release;
distribution is unlimited. AFFTC-PA-11318). Gary L. Gadbury is an
Associate Professor in the Department of Statistics at Kansas State
University, Manhattan, KS 66506 (E-mail: gadbury@ksu.edu). David B.
Allison is a Professor and Head of the Section on Statistical Genetics,
Department of Biostatistics, University of Alabama at Birmingham,
Birmingham, AL 35294 (E-mail: dallison@uab.edu). Dr. Allison
acknowledges research support from NIH R01DK078826. The authors are
grateful to Kraft Foods for supplying the data for this article. The
authors acknowledge helpful comments from the editors and two referees.
NR 39
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U1 1
U2 7
PU AMER STATISTICAL ASSOC
PI ALEXANDRIA
PA 732 N WASHINGTON ST, ALEXANDRIA, VA 22314-1943 USA
SN 0003-1305
J9 AM STAT
JI Am. Stat.
PD FEB
PY 2012
VL 66
IS 1
BP 16
EP 24
DI 10.1080/00031305.2012.671724
PG 9
WC Statistics & Probability
SC Mathematics
GA 963BC
UT WOS:000305594100003
PM 23204562
ER
PT J
AU Maturo, S
Hill, C
Bunting, G
Ballif, C
Maurer, R
Hartnick, C
AF Maturo, Steve
Hill, Courtney
Bunting, Glenn
Ballif, Cathy
Maurer, Rie
Hartnick, Christopher
TI Pediatric Laryngeal Diadochokinetic Rates: Establishing a Normative
Database
SO OTOLARYNGOLOGY-HEAD AND NECK SURGERY
LA English
DT Article
DE diadochokinetic; DDK; pediatric voice; pediatric speech
ID ORAL DIADOCHOKINESIS; SPEECH; CHILDREN; ADOLESCENTS; ACCURACY
AB Objective. Laryngeal diadochokinetic (L-DDK) rate is a measure of laryngeal neural integrity. The objectives for this study included the following: (1) establish the first comprehensive pediatric normative database for L-DDK rates (DDK) using the Voice Evaluation Suite, a computerized voice analysis program; and (2) analyze normal L-DDK rates for age and gender differences.
Study Design. Cross-sectional study with planned data collection.
Setting. Outpatient pediatric otolaryngology clinic.
Subjects and Methods. Three hundred seven children aged 4 to 18 with normal voices. L-DDK rates were collected during a 6-month period. Main outcome measures included age, gender, and L-DDK rates.
Results. Three hundred seven children (151 girls and 156 boys) were evaluated. There was no statistically significant difference between the overall mean L-DDK rate of boys (2.69 syllables/s) compared to girls (2.55 syllables/s; P > .05). Further analysis of all individual age groups did not reveal any statistical significance between boys and girls. There was a statistically significant difference among children aged 4 to 11 compared to those 12 to 18 years old. Among boys aged 4 to 11, the mean rate was 2.49 syllables per second, whereas among 12- to 18-year-olds, the rate was 2.95 syllables per second (P < .01). The mean rate was 2.40 syllables per second among girls aged 4 to 11 and 2.74 syllables per second for those aged 12 to 18 (P < .01).
Conclusion. This is the largest normative pediatric L-DDK analysis in the English literature. The findings suggest that neurolaryngeal development approaches adult maturation at the beginning of the teenage years. These data have the potential application for objective measurement of neurolaryngeal coordination in children with neurologic impairment and also in children who have undergone nerve reinnervation procedures.
C1 [Maturo, Steve] Wilford Hall USAF Med Ctr, San Antonio Uniformed Serv Hlth Educ Consortium, Dept Otolaryngol Head & Neck Surg, Lackland AFB, TX 78236 USA.
[Hill, Courtney; Hartnick, Christopher] Harvard Univ, Sch Med, Dept Otol & Laryngol, Massachusetts Eye & Ear Infirm, Boston, MA 02115 USA.
[Bunting, Glenn; Ballif, Cathy] Massachusetts Eye & Ear Infirm, Voice & Speech Lab, Boston, MA 02114 USA.
[Maurer, Rie] Brigham & Womens Hosp, Ctr Clin Invest, Boston, MA 02115 USA.
[Maurer, Rie] Harvard Clin & Translat Sci Ctr, Boston, MA USA.
RP Maturo, S (reprint author), Wilford Hall USAF Med Ctr, San Antonio Uniformed Serv Hlth Educ Consortium, Dept Otolaryngol Head & Neck Surg, Lackland AFB, TX 78236 USA.
EM Stephen.maturo@sbcglobal.net
NR 16
TC 1
Z9 1
U1 2
U2 7
PU SAGE PUBLICATIONS LTD
PI LONDON
PA 1 OLIVERS YARD, 55 CITY ROAD, LONDON EC1Y 1SP, ENGLAND
SN 0194-5998
J9 OTOLARYNG HEAD NECK
JI Otolaryngol. Head Neck Surg.
PD FEB
PY 2012
VL 146
IS 2
BP 302
EP 306
DI 10.1177/0194599811426259
PG 5
WC Otorhinolaryngology; Surgery
SC Otorhinolaryngology; Surgery
GA 935SR
UT WOS:000303541300023
PM 22027868
ER
PT J
AU Johnson, PN
Boyles, KA
Miller, JL
AF Johnson, Peter N.
Boyles, Krystal A.
Miller, Jamie L.
TI Selection of the Initial Methadone Regimen for the Management of
Iatrogenic Opioid Abstinence Syndrome in Critically Ill Children
SO PHARMACOTHERAPY
LA English
DT Review
DE opioid withdrawal; iatrogenic opioid abstinence syndrome; methadone;
opioid; children
ID INTENSIVE-CARE-UNIT; WITHDRAWAL SYMPTOMS; CANCER PAIN; DOSE RATIO;
DEPENDENCY; TOLERANCE; SEDATION; MORPHINE; PHARMACOKINETICS; PREVENTION
AB Iatrogenic opioid abstinence syndrome (IOAS) is a common complication in critically ill infants and children receiving prolonged exposure to continuous infusions of opioids. Although no guidelines are available regarding management of IOAS in children, several treatment options are available, including clonidine, morphine, and methadone. Methadone is commonly prescribed due to its long half-life and antagonism of the N-methyl-D-aspartate receptor. Different approaches, such as weight-based and formula-based methods, have been used to determine the initial methadone dosing regimen. Because of the vast differences in the recommended dosing regimen from these sources, we conducted a literature search to identify articles evaluating the initial methadone dosing regimen for prevention and/or treatment of IOAS in children. Specifically, we evaluated the reported frequency of withdrawal and oversedation after initiation of methadone treatment. Our literature search was limited to English-language articles in the MEDLINE (1950-March 2011), EMBASE (1988-March 2011), International Pharmaceutical Abstracts (1970-March 2011), and Cochrane Library (1996-March 2011) databases. Relevant abstracts and reference citations were also reviewed. A total of eight reports representing 183 patients were included in the analysis. There was wide discrepancy in the initial methadone dosing regimen. Approximately one-third of all patients experienced withdrawal after starting methadone, and there did not appear to be a difference between weight-based and formula-based regimens. Seven patients experienced oversedation; however, not all articles reported this complication. It appears that a standard approach to initial methadone dosing does not exist because withdrawal occurred despite the regimen started. Therefore, it seems best to begin with the lowest dose possible and titrate to the child's response to avoid complications such as oversedation. Routine monitoring should be performed in all patients to guide clinicians in the management of IOAS.
C1 [Johnson, Peter N.; Miller, Jamie L.] Univ Oklahoma, Coll Pharm, Dept Pharm Clin & Adm Sci, Oklahoma City, OK 73117 USA.
[Boyles, Krystal A.] USAF, BSC, Hill AFB, UT USA.
RP Johnson, PN (reprint author), Univ Oklahoma, Coll Pharm, Dept Pharm Clin & Adm Sci, 1110 N Stonewall Ave,CPB 206, Oklahoma City, OK 73117 USA.
EM peter-johnson@ouhsc.edu
NR 34
TC 8
Z9 8
U1 0
U2 2
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0277-0008
J9 PHARMACOTHERAPY
JI Pharmacotherapy
PD FEB
PY 2012
VL 32
IS 2
BP 148
EP 157
DI 10.1002/PHAR.1001
PG 10
WC Pharmacology & Pharmacy
SC Pharmacology & Pharmacy
GA 933EJ
UT WOS:000303342200012
PM 22392424
ER
PT J
AU Costantine, J
Tawk, Y
Christodoulou, CG
Lyke, JC
De Flaviis, F
Besoli, AG
Barbin, SE
AF Costantine, Joseph
Tawk, Youssef
Christodoulou, Christos G.
Lyke, James C.
De Flaviis, Franco
Besoli, Alfred Grau
Barbin, Silvio E.
TI Analyzing the Complexity and Reliability of
Switch-Frequency-Reconfigurable Antennas Using Graph Models
SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
LA English
DT Article
DE Complexity; graph theory; reconfigurable antennas; reliability; switches
ID RF MEMS SWITCHES
AB This paper addresses the functional reliability and the complexity of reconfigurable antennas using graph models. The correlation between complexity and reliability for any given reconfigurable antenna is defined. Two methods are proposed to reduce failures and improve the reliability of reconfigurable antennas. The failures are caused by the reconfiguration technique or by the surrounding environment. These failure reduction methods proposed are tested and examples are given which verify these methods.
C1 [Costantine, Joseph] Calif State Univ Fullerton, Dept Elect Engn, Fullerton, CA 92834 USA.
[Tawk, Youssef; Christodoulou, Christos G.] Univ New Mexico, Dept Elect & Comp Engn, Albuquerque, NM 87131 USA.
[Lyke, James C.] USAF, Res Lab, Albuquerque, NM 87117 USA.
[De Flaviis, Franco] Univ Calif Irvine, Dept Elect Engn & Comp Sci, Irvine, CA 92697 USA.
[Besoli, Alfred Grau] Broadcom Corp, Irvine, CA 92617 USA.
[Barbin, Silvio E.] Univ Sao Paulo, Telecommun & Control Engn Dept, Polytech Sch, BR-05508900 Sao Paulo, Brazil.
RP Costantine, J (reprint author), Calif State Univ Fullerton, Dept Elect Engn, Fullerton, CA 92834 USA.
NR 17
TC 5
Z9 5
U1 1
U2 6
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-926X
J9 IEEE T ANTENN PROPAG
JI IEEE Trans. Antennas Propag.
PD FEB
PY 2012
VL 60
IS 2
BP 811
EP 820
DI 10.1109/TAP.2011.2173104
PN 2
PG 10
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA 924VV
UT WOS:000302720300011
ER
PT J
AU Hyde, MW
Havrilla, MJ
Bogle, AE
Rothwell, EJ
AF Hyde, Milo W.
Havrilla, Michael J.
Bogle, Andrew E.
Rothwell, Edward J.
TI Nondestructive Material Characterization of a Free-Space-Backed Magnetic
Material Using a Dual-Waveguide Probe
SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
LA English
DT Article
DE Green's function; integral equations; microwave measurements; moment
methods; open-ended; parallel-plate waveguides; permeability
measurement; permittivity measurement; waveguides
ID ENDED COAXIAL PROBE; COMPLEX PERMITTIVITY; DIELECTRIC MEASUREMENTS;
MICROWAVE-FREQUENCIES; PHYSICAL OPTICS; CRACK DETECTION; PERMEABILITY;
FORMULATION; RADIATION; TISSUES
AB A free-space-backed dual-waveguide probe measurement technique is introduced to determine nondestructively the complex permittivity and permeability of an unknown material. The purpose of this new measurement technique is to complement the existing PEC-backed dual-waveguide probe material-characterization method. Provided in this paper is the theoretical development of the new technique and its experimental validation. It is shown, by applying Love's equivalence theorem, that a system of coupled magnetic field integral equations can be formulated and subsequently solved for the dominant mode reflection and transmission coefficients using the method of moments. Also included in the theoretical development of the new technique is a derivation of the dyadic Green's function for a magnetic-current-excited two-medium grounded-slab environment. Last, experimental complex permittivity and permeability parameters extracted for two magnetic-shielding materials are presented and analyzed to validate the new technique.
C1 [Hyde, Milo W.; Havrilla, Michael J.; Bogle, Andrew E.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
[Rothwell, Edward J.] Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA.
RP Hyde, MW (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
EM milo.hyde@afit.edu
NR 50
TC 3
Z9 3
U1 1
U2 5
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-926X
EI 1558-2221
J9 IEEE T ANTENN PROPAG
JI IEEE Trans. Antennas Propag.
PD FEB
PY 2012
VL 60
IS 2
BP 1009
EP 1019
DI 10.1109/TAP.2011.2173136
PN 2
PG 11
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA 924VV
UT WOS:000302720300032
ER
PT J
AU Tawk, Y
Costantine, J
Hemmady, S
Balakrishnan, G
Avery, K
Christodoulou, CG
AF Tawk, Youssef
Costantine, Joseph
Hemmady, Sameer
Balakrishnan, Ganesh
Avery, Keith
Christodoulou, Christos G.
TI Demonstration of a Cognitive Radio Front End Using an Optically Pumped
Reconfigurable Antenna System (OPRAS)
SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
LA English
DT Article
DE Cognitive radio; laser diodes; photoconductivity; reconfigurable
antenna; silicon; ultrawideband (UWB)
ID PHOTOCONDUCTIVE SWITCH; DESIGN; FREQUENCY
AB A cognitive radio front end using an optically pumped reconfigurable antenna system (OPRAS) is investigated. The scheme consists of a ultrawidebhand antenna and a reconfigurable narrowband antenna in close proximity to one another. The narrowband reconfigurability is achieved by a integrating laser diodes within the antenna structure to control the switching state of photoconductive silicon switches. This scheme has the advantage of eliminating the use of optical fiber cables to guide light to the switches, and enables easier integration of the reconfigurable antenna in a complete communication system. The performance of the proposed technique is presented, and comparisons are made to other commonly used switching techniques for reconfigurable antennas, such as techniques based on PIN diodes and RF microlectromechanical systems integration. The application of this antenna design scheme serving as the receive channel in a cognitive radio communication link is also demonstrated.
C1 [Tawk, Youssef; Hemmady, Sameer; Christodoulou, Christos G.] Univ New Mexico, Elect & Comp Engn Dept, Albuquerque, NM 87131 USA.
[Costantine, Joseph] Calif State Univ Fullerton, Dept Elect Engn, Fullerton, CA 92834 USA.
[Balakrishnan, Ganesh] Univ New Mexico, Ctr High Technol Mat, Albuquerque, NM 87131 USA.
[Avery, Keith] USAF, Res Lab, Space Vehicles Directorate, Albuquerque, NM 87117 USA.
RP Tawk, Y (reprint author), Univ New Mexico, Elect & Comp Engn Dept, Albuquerque, NM 87131 USA.
EM yatawk@ece.unm.edu; jcostan-tine@fullerton.edu; shemmady@unm.edu;
gunny@unm.edu; keith.avery@kirtland.af.mil; christos@ece.unm.edu
FU Air Force Research Lab [FA9453-09-C-0309]
FX This work was supported by the Air Force Research Lab under Contract
FA9453-09-C-0309.
NR 29
TC 26
Z9 27
U1 0
U2 9
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0018-926X
J9 IEEE T ANTENN PROPAG
JI IEEE Trans. Antennas Propag.
PD FEB
PY 2012
VL 60
IS 2
BP 1075
EP 1083
DI 10.1109/TAP.2011.2173139
PN 2
PG 9
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA 924VV
UT WOS:000302720300040
ER
PT J
AU Schrock, CR
Wood, AW
AF Schrock, Christopher R.
Wood, Aihua W.
TI Convergence of A Distributional Monte Carlo Method for the Boltzmann
Equation
SO ADVANCES IN APPLIED MATHEMATICS AND MECHANICS
LA English
DT Article
DE Direct simulation monte carlo; rarefied gas dynamics; Boltzmann
equation; convergence proof
ID DISCRETE-VELOCITY MODELS; SIMULATION SCHEME; PROOF; GAS
AB Direct Simulation Monte Carlo (DSMC) methods for the Boltzmann equation employ a point measure approximation to the distribution function, as simulated particles may possess only a single velocity. This representation limits the method to converge only weakly to the solution of the Boltzmann equation. Utilizing kernel density estimation we have developed a stochastic Boltzmann solver which possesses strong convergence for bounded and L-infinity solutions of the Boltzmann equation. This is facilitated by distributing the velocity of each simulated particle instead of using the point measure approximation inherent to DSMC. We propose that the development of a distributional method which incorporates distributed velocities in collision selection and modeling should improve convergence and potentially result in a substantial reduction of the variance in comparison to DSMC methods. Toward this end, we also report initial findings of modeling collisions distributionally using the Bhatnagar-Gross-Krook collision operator.
C1 [Schrock, Christopher R.; Wood, Aihua W.] USAF, Inst Technol, Dept Math & Stat, Wright Patterson AFB, OH 45433 USA.
RP Wood, AW (reprint author), USAF, Inst Technol, Dept Math & Stat, Wright Patterson AFB, OH 45433 USA.
EM christopher.schrock@wpafb.af.mil; aihua.wood@afit.edu
FU Air Force Office of Scientific Research [PEDRS001]
FX This research is supported in part by the Air Force Office of Scientific
Research, Project Number PEDRS001. The views expressed in this article
are those of the authors and do not reflect the official policy or
position of the United States Air Force, Department of Defense, or the
US Government.
NR 25
TC 1
Z9 1
U1 2
U2 7
PU GLOBAL SCIENCE PRESS
PI WANCHAI
PA ROOM 3208, CENTRAL PLAZA, 18 HARBOUR RD, WANCHAI, HONG KONG 00000,
PEOPLES R CHINA
SN 2070-0733
J9 ADV APPL MATH MECH
JI Adv. Appl. Math. Mech.
PD FEB
PY 2012
VL 4
IS 1
BP 102
EP 121
DI 10.4208/aamm.10-m11113
PG 20
WC Mathematics, Applied; Mechanics
SC Mathematics; Mechanics
GA 928DC
UT WOS:000302959600007
ER
PT J
AU Chen, JZ
Shiyanov, P
Schlager, JJ
Green, KB
AF Chen, Jianzhong
Shiyanov, Pavel
Schlager, John J.
Green, Kari B.
TI A Pseudo MS3 Approach for Identification of Disulfide-Bonded Proteins:
Uncommon Product Ions and Database Search
SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
LA English
DT Article
DE MS/MS; MS3; Intact protein; Top-down; Disulfide bond cleavage; Lysozyme;
Collision-induced dissociation; Nozzle-skimmer dissociation; Database
search; ProteinProspector; Mobile proton; Uncommon product ions;
Quadrupole time-of-flight; Electrospray ionization; c ion; d ion; b+H2O
ion; Neutral loss; Oxazolone structure; Sequence scrambling; Sodiated
ion; HN=C=NH; Salt bridge; six-membered ring; Bond rearrangement;
Arginine residue; Lysine residue; Aspartic acid residue; Cysteine
residue
ID COLLISION-INDUCED DISSOCIATION; TANDEM MASS-SPECTROMETRY;
ELECTRON-TRANSFER DISSOCIATION; GAS-PHASE CLEAVAGE; PROTONATED PEPTIDES;
TOP-DOWN; FRAGMENTATION PATHWAYS; AMINO-ACID; SEQUENCE INFORMATION;
CAPTURE DISSOCIATION
AB It has previously been reported that disulfide and backbone bonds of native intact proteins can be concurrently cleaved using electrospray ionization (ESI) and collision-induced dissociation (CID) tandem mass spectrometry (MS/MS). However, the cleavages of disulfide bonds result in different cysteine modifications in product ions, making it difficult to identify the disulfide-bonded proteins via database search. To solve this identification problem, we have developed a pseudo MS3 approach by combining nozzle-skimmer dissociation (NSD) and CID on a quadrupole time-of-flight (Q-TOF) mass spectrometer using chicken lysozyme as a model. Although many of the product ions were similar to those typically seen in MS/MS spectra of enzymatically derived peptides, additional uncommon product ions were detected including c(i-1) ions (the i(th) residue being aspartic acid, arginine, lysine and dehydroalanine) as well as those from a scrambled sequence. The formation of these uncommon types of product ions, likely caused by the lack of mobile protons, were proposed to involve bond rearrangements via a six-membered ring transition state and/or salt bridge(s). A search of 20 pseudo MS3 spectra against the Gallus gallus (chicken) database using Batch-Tag, a program originally designed for bottom up MS/MS analysis, identified chicken lysozyme as the only hit with the expectation values less than 0.02 for 12 of the spectra. The pseudo MS3 approach may help to identify disulfide-bonded proteins and determine the associated post-translational modifications (PTMs); the confidence in the identification may be improved by incorporating the fragmentation characteristics into currently available search programs.
C1 [Chen, Jianzhong; Shiyanov, Pavel; Schlager, John J.] USAF, Res Lab, Appl Biotechnol Branch, Dayton, OH 45433 USA.
[Chen, Jianzhong; Green, Kari B.] Ohio State Univ, Mass Spectrometry & Prote Facil, Columbus, OH 43210 USA.
RP Chen, JZ (reprint author), USAF, Res Lab, Appl Biotechnol Branch, Dayton, OH 45433 USA.
EM jianzhongc@yahoo.com
RI Chen, Jianzhong/I-4450-2012
NR 58
TC 6
Z9 6
U1 1
U2 12
PU SPRINGER
PI NEW YORK
PA 233 SPRING ST, NEW YORK, NY 10013 USA
SN 1044-0305
J9 J AM SOC MASS SPECTR
JI J. Am. Soc. Mass Spectrom.
PD FEB
PY 2012
VL 23
IS 2
BP 225
EP 243
DI 10.1007/s13361-011-0294-6
PG 19
WC Biochemical Research Methods; Chemistry, Analytical; Chemistry,
Physical; Spectroscopy
SC Biochemistry & Molecular Biology; Chemistry; Spectroscopy
GA 921HD
UT WOS:000302467800004
PM 22170466
ER
PT J
AU Null, DM
Yoder, BA
DiGeronimo, RJ
AF Null, Donald M.
Yoder, Bradley A.
DiGeronimo, Robert J.
TI Early Neonatal Research at Wilford Hall US Air Force Medical Center
SO PEDIATRICS
LA English
DT Article
ID HYALINE-MEMBRANE DISEASE; FREQUENCY OSCILLATORY VENTILATION;
RESPIRATORY-DISTRESS SYNDROME; PULMONARY INTERSTITIAL EMPHYSEMA;
POSITIVE-PRESSURE VENTILATION; PREMATURE BABOON; OXYGENATION ECMO;
FAILURE; INFANTS; TRANSPORT
C1 [Null, Donald M.; Yoder, Bradley A.] Univ Utah, Hlth Sci Ctr, Dept Pediat, Div Neonatol, Salt Lake City, UT USA.
[DiGeronimo, Robert J.] Wilford Hall USAF Med Ctr, Dept Pediat, Div Neonatol, Lackland AFB, TX 78236 USA.
RP DiGeronimo, RJ (reprint author), 295 Chipeta Way, Salt Lake City, UT 84158 USA.
EM robert.digeronimo@hsc.utah.edu
NR 33
TC 1
Z9 1
U1 0
U2 0
PU AMER ACAD PEDIATRICS
PI ELK GROVE VILLAGE
PA 141 NORTH-WEST POINT BLVD,, ELK GROVE VILLAGE, IL 60007-1098 USA
SN 0031-4005
J9 PEDIATRICS
JI Pediatrics
PD FEB
PY 2012
VL 129
SU 1
BP S20
EP S26
DI 10.1542/peds.2010-3797e
PG 7
WC Pediatrics
SC Pediatrics
GA 923ER
UT WOS:000302602700004
PM 22300825
ER
PT J
AU Dickinson, BT
Singler, JR
Batten, BA
AF Dickinson, B. T.
Singler, J. R.
Batten, B. A.
TI Mathematical modeling and simulation of biologically inspired hair
receptor arrays in laminar unsteady flow separation
SO JOURNAL OF FLUIDS AND STRUCTURES
LA English
DT Article
DE Micro air vehicles; Bats; Hair cell; Micropillars; Microcantilevers;
Cilia
ID CIRCULAR-CYLINDER; FILIFORM HAIRS; BOUNDARY-LAYER; SENSORS; INSECTS;
NUMBER; FORCES; MOTION; FLIGHT; FLUID
AB Bats possess arrays of distributed flow-sensitive hair-like mechanoreceptors on their dorsal and ventral wing surfaces. Bat wing hair receptors are known to play a significant role in flight maneuverability and are directionally most sensitive to reversed flow over the wing. In this work, we consider the mechanics of flexible hair-like structures for the time accurate detection and visualization of hydrodynamic images associated with unsteady near surface flow phenomena. A nonlinear viscoelastic model of a hair-like structure coupled to an unsteady nonuniform flow is proposed. Writing the hair model in nondimensional form, we identify five dimensionless groups that govern hair behavior. An order of magnitude analysis of the physical forces involved in the fluidstructure hair response is performed. Through the choice of hair material properties, we show how a local measure of near surface flow velocity may be obtained from hair tip displacement and resultant moment. When hair structures are placed into an array, time and space accurate hydrodynamic images may be obtained. We illustrate the imaging of reversed flow that occurs during a laminar unsteady flow separation with an array of hair-like structures. Published by Elsevier Ltd.
C1 [Dickinson, B. T.] USAF, Munit Directorate, Res Lab, Eglin AFB, FL 32542 USA.
[Singler, J. R.] Missouri Univ Sci & Technol, Dept Math & Stat, Rolla, MO 65409 USA.
[Batten, B. A.] Oregon State Univ, Sch Mech Ind & Mfg Engn, Corvallis, OR 97331 USA.
RP Dickinson, BT (reprint author), USAF, Munit Directorate, Res Lab, 101 W Eglin Blvd,Ste 213, Eglin AFB, FL 32542 USA.
EM btdickinson@lifetime.oregonstate.edu; singlerj@mst.edu;
bbatten@engr.orst.edu
RI Singler, John/R-1489-2016
OI Singler, John/0000-0002-5415-8386
FU Air Force Office of Scientific Research [FA9550-05-1-0041,
FA9550-07-1-0540]
FX We would like to thank Susanne Sterbing-D'Angelo for editing comments
and information on bat hair receptors. We also would like to thank
Sharon Swartz for many interesting conversations regarding bat hair
receptors. Finally we would like to thank Cody Ray, Ehsan Shams, Dave
Willis and Arun Wikiramasuriya for their editing comments. This research
was supported in part by the Air Force Office of Scientific Research
through grants FA9550-05-1-0041 and FA9550-07-1-0540.
NR 55
TC 12
Z9 13
U1 2
U2 18
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0889-9746
J9 J FLUID STRUCT
JI J. Fluids Struct.
PD FEB
PY 2012
VL 29
BP 1
EP 17
DI 10.1016/j.jfluidstructs.2011.12.010
PG 17
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA 915OW
UT WOS:000302038300001
ER
PT J
AU Ruggles-Wrenn, MB
Delapasse, J
Chamberlain, AL
Lane, JE
Cook, TS
AF Ruggles-Wrenn, M. B.
Delapasse, J.
Chamberlain, A. L.
Lane, J. E.
Cook, T. S.
TI Fatigue behavior of a Hi-Nicalon (TM)/SiC-B4C composite at 1200 degrees
C in air and in steam
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Ceramic-matrix composites (CMCs); Fatigue; High-temperature properties;
Mechanical properties; Fractography
ID SIC-MATRIX COMPOSITES; CERAMIC-MATRIX; CREEP-BEHAVIOR; SIC/SIC
COMPOSITES; HIGH-TEMPERATURES; STRESS-RUPTURE; OXIDATION; MECHANISMS;
DESIGN; FIBERS
AB Effects of steam environment on fatigue behavior of a non-oxide ceramic composite with a multilayered matrix were investigated at 1200 degrees C. The composite was produced via chemical vapor infiltration (CVI). The composite had an oxidation inhibited matrix, which consisted of alternating layers of silicon carbide and boron carbide and was reinforced with laminated woven Hi-Nicalon (TM) fibers. Fiber preforms had pyrolytic carbon fiber coating with boron carbon overlay applied. Tensile stress-strain behavior and tensile properties were evaluated at 1200 degrees C. Tension-tension fatigue tests were conducted at 0.1 Hz and at 1.0 Hz for fatigue stresses ranging from 100 to 140 MPa in air and in steam. Fatigue run-out was defined as 10(5) cycles at 0.1 Hz and as 2 x 10(5) cycles at 1.0 Hz. Presence of steam had little influence on fatigue performance at 1.0 Hz, but noticeably degraded the fatigue lifetimes at 0.1 Hz. Specimens that achieved run-out were subjected to tensile tests to failure to characterize the retained tensile properties. Prior fatigue in air and in steam caused significant reduction in tensile strength and modulus. Composite microstructure, as well as damage and failure mechanisms were investigated. Published by Elsevier B.V.
C1 [Ruggles-Wrenn, M. B.; Delapasse, J.] USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
[Chamberlain, A. L.; Lane, J. E.; Cook, T. S.] Rolls Royce, Indianapolis, IN USA.
RP Ruggles-Wrenn, MB (reprint author), USAF, Inst Technol, Dept Aeronaut & Astronaut, Wright Patterson AFB, OH 45433 USA.
EM marina.ruggles-wrenn@afit.edu
RI Ruggles-Wrenn, Marina/J-6103-2014
NR 39
TC 17
Z9 18
U1 1
U2 17
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD FEB 1
PY 2012
VL 534
BP 119
EP 128
DI 10.1016/j.msea.2011.11.049
PG 10
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 914YL
UT WOS:000301989600016
ER
PT J
AU Adams, SF
Bogdanov, EA
Demidov, VI
Koepke, ME
Kudryavtsev, AA
Williamson, JM
AF Adams, S. F.
Bogdanov, E. A.
Demidov, V. I.
Koepke, M. E.
Kudryavtsev, A. A.
Williamson, J. M.
TI Metastable atom and electron density diagnostic in the initial stage of
a pulsed discharge in Ar and other rare gases by emission spectroscopy
SO PHYSICS OF PLASMAS
LA English
DT Article
ID ICP DISCHARGE; IONIZATION KINETICS; NOBLE-GAS; PLASMA; AFTERGLOW
AB Temporal measurements of the emission intensities of the Ar 419.8 and 420.1 nm spectral lines combined with Ar plasma modeling were used to examine the metastable atom and electron density behavior in the initial stage of a pulsed dc discharge. The emission intensity measurements of these spectral lines near the start of a pulsed dc discharge in Ar demonstrated a sharp growth of metastable atom and electron densities which was dependent on the applied reduced electric fields. For lower electric fields, the sharp growth of metastable atom density started earlier than the sharp electron density growth. The reverse situation was observed for larger electric fields. This presents the possibility for controlling plasma properties which may be useful for technological applications. Similar measurements with spectral lines of corresponding transitions in other rare gases are examined. (C) 2012 American Institute of Physics. [doi:10.1063/1.3686142]
C1 [Adams, S. F.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Bogdanov, E. A.; Kudryavtsev, A. A.] St Petersburg State Univ, St Petersburg, Russia.
[Demidov, V. I.; Koepke, M. E.] W Virginia Univ, Morgantown, WV 26506 USA.
[Williamson, J. M.] Universal Energy Syst Inc, Dayton, OH 45432 USA.
RP Adams, SF (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RI Bogdanov, Evgeny/I-3232-2012; Demidov, Vladimir/A-4247-2013;
Kudryavtsev, Anatoly/I-3413-2012
OI Bogdanov, Evgeny/0000-0002-3397-3162; Demidov,
Vladimir/0000-0002-2672-7684; Kudryavtsev, Anatoly/0000-0002-2232-2954
FU DOE OFES [DE-SC0001939]; NSF [CBET-0903635]; AFOSR; GK [14.740.11.0893]
FX The authors would like to thank C. A. DeJoseph, Jr., I. Kaganovich, and
Y. Raitses for valuable discussions and J. Miles for help in
experiments. This work was supported by the DOE OFES (Contract No.
DE-SC0001939), NSF (Grant No. CBET-0903635), GK 14.740.11.0893 and
AFOSR.
NR 22
TC 6
Z9 6
U1 1
U2 17
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 1070-664X
J9 PHYS PLASMAS
JI Phys. Plasmas
PD FEB
PY 2012
VL 19
IS 2
AR 023510
DI 10.1063/1.3686142
PG 7
WC Physics, Fluids & Plasmas
SC Physics
GA 907CQ
UT WOS:000301395800068
ER
PT J
AU Minton, TK
Wright, ME
Tomczak, SJ
Marquez, SA
Shen, LH
Brunsvold, AL
Cooper, R
Zhang, JM
Vij, V
Guenthner, AJ
Petteys, BJ
AF Minton, Timothy K.
Wright, Michael E.
Tomczak, Sandra J.
Marquez, Sara A.
Shen, Linhan
Brunsvold, Amy L.
Cooper, Russell
Zhang, Jianming
Vij, Vandana
Guenthner, Andrew J.
Petteys, Brian J.
TI Atomic Oxygen Effects on POSS Polyimides in Low Earth Orbit
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE hyperthermal atomic oxygen; polyimide; polyhedral oligomeric
silsesquioxane; POSS; space environment; polymer erosion; low Earth
orbit
ID OLIGOMERIC SILSESQUIOXANE POLYIMIDES; HYPERVELOCITY SPACE DEBRIS;
HYPERTHERMAL REACTIONS; SCATTERING DYNAMICS; HYDROCARBON SURFACE; O(P-3)
COLLISIONS; VUV RADIATION; FEP TEFLON; POLYMERS; EROSION
AB Kapton polyimde is extensively used in solar arrays, spacecraft thermal blankets, and space inflatable structures. Upon exposure to atomic oxygen in low Earth orbit (LEO), Kapton is severely eroded. An effective approach to prevent this erosion is to incorporate polyhedral oligomeric silsesquioxane (POSS.) into the polyimide matrix by copolymerizing POSS monomers with the polyimide precursor. The copolymerization of POSS provides Si and O in the polymer matrix on the nano level. During exposure of POSS polyimide to atomic oxygen, organic material is degraded, and a silica, passivation layer is formed. This silica layer protects the underlying polymer from further degradation. Laboratory and space-flight experiments have shown that POSS polyimides are highly resistant to atomic-oxygen attack, with erosion yields that may be as little as 1% those of Kapton. The results of all the studies indicate that POSS polyimide would be a space-survivable replacement for Kapton on spacecraft that operate in the LEO environment.
C1 [Minton, Timothy K.; Marquez, Sara A.; Shen, Linhan; Brunsvold, Amy L.; Cooper, Russell; Zhang, Jianming] Montana State Univ, Dept Chem & Biochem, Bozeman, MT 59717 USA.
[Tomczak, Sandra J.] USAF, AFRL RZSB, Motor Branch, Res Lab, Edwards AFB, CA 93524 USA.
[Vij, Vandana] USAF, ERC Inc, Mat Applicat Branch, Res Lab, Edwards AFB, CA 93524 USA.
[Wright, Michael E.; Petteys, Brian J.] USN, Res & Engn Sci Dept, Div Chem, NAVAIR, China Lake, CA 93555 USA.
[Guenthner, Andrew J.] USAF, AFRL RZSM, Mat Applicat Branch, Res Lab, Edwards AFB, CA 93524 USA.
RP Minton, TK (reprint author), Montana State Univ, Dept Chem & Biochem, 103 Chem Biochem Bldg, Bozeman, MT 59717 USA.
EM tminton@montana.edu
RI Brunsvold, Amy/H-4315-2016
OI Brunsvold, Amy/0000-0001-9257-2978
FU Defense Advanced Research Projects Agency (DARPA); Air Force Office of
Scientific Research [F49620-01-1-0276, LRIR-92PL0COR]; National Science
Foundation [CHE-0943639]
FX This work was supported by the Defense Advanced Research Projects Agency
(DARPA), the Air Force Office of Scientific Research (Grants
F49620-01-1-0276 & LRIR-92PL0COR), and the National Science Foundation
(CHE-0943639).
NR 61
TC 36
Z9 40
U1 6
U2 68
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD FEB
PY 2012
VL 4
IS 2
BP 492
EP 502
DI 10.1021/am201509n
PG 11
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 897IW
UT WOS:000300644500002
PM 22188314
ER
PT J
AU Reams, JT
Guenthner, AJ
Lamison, KR
Vij, V
Lubin, LM
Mabry, JM
AF Reams, Josiah T.
Guenthner, Andrew J.
Lamison, Kevin R.
Vij, Vandana
Lubin, Lisa M.
Mabry, Joseph M.
TI Effect of Chemical Structure and Network Formation on Physical
Properties of Di(Cyanate Ester) Thermosets
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE cyanate ester; polycyanurate; resin; cure kinetics; water uptake
ID CROSS-LINK DENSITY; CYANATE ESTER; CURE KINETICS;
TRANSITION-TEMPERATURE; POLYCYANURATE NETWORKS; MECHANICAL-PROPERTIES;
CURING BEHAVIOR; DICYANATE; RESINS; MOISTURE
AB Key physical properties of three dicyanate ester monomers, bisphenol A dicyanate (BADCy), bisphenol E dicyanate (LECy), and the dicyanate of a silicon containing analogue of bisphenol A (SiMCy) were investigated as a function of cyanurate conversion at conversions ranging from approximately 70% to greater than 90% in order to assess the range of applicability of both traditional and more unusual structure property process relationships known, for cyanate ester resins. A, more complete understanding of these relationships is essential for the continued development of cyanate ester resins and their composites for a wide variety of aerospace applications. The degree of cure in each system was determined by differential scanning calorimetry (DSC). The degree of conversion achieved at a-given temperature was dependent on the structure of the repeat unit, with SiMCy displaying the highest relative ease of cure. The density at room temperature was found to decrease monotonically with increasing conversion for all monomer types studied. In contrast, the water uptake decreased with increasing cure for all three materials over most or all of the conversion range studied, but leveled off or began to increase with increasing conversion at conversions of approximately 90%. The T-g decreased after exposure to hot water in resins with greater than 85% conversion, but unexpectedly increased in samples with lower conversions. An investigation of the effect of hot water exposure on network chemistry via infrared spectroscopy indicated that carbamate formation varied with both monomer chemistry and extent of cure, but was greatest for the BADCy polycyanurates. On the other hand, the unreacted cyanate ester band tended to disappear uniformly, suggesting that reactions other than carbamate formation (such as cyclotrimerization) may also take place during exposure to hot water, possibly giving rise to the observed unusual increases in T-g upon exposure.
C1 [Reams, Josiah T.] USAF, Natl Res Council, Res Lab, Prop Directorate, Edwards AFB, CA USA.
[Lamison, Kevin R.; Vij, Vandana; Lubin, Lisa M.] ERC Inc, Edwards AFB, CA USA.
RP Reams, JT (reprint author), USAF, Natl Res Council, Res Lab, Prop Directorate, Edwards AFB, CA USA.
EM josiah.reams.ctr@edwards.af.mil; andrew.guenthner@edwards.af.mil
FU Air Force Office of Scientific Research; Air Force Research Laboratory,
Propulsion Directorate
FX Support from the Air Force Office of Scientific Research and the Air
Force Research Laboratory, Propulsion Directorate, is gratefully
acknowledged. J.T.R. also acknowledges the National Research Council
Research Associateship Program under which his efforts were conducted.
NR 45
TC 12
Z9 12
U1 0
U2 15
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD FEB
PY 2012
VL 4
IS 2
BP 527
EP 535
DI 10.1021/am201413t
PG 9
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 897IW
UT WOS:000300644500006
PM 22311550
ER
PT J
AU Roy, AK
Farmer, BL
Varshney, V
Sihn, S
Lee, J
Ganguli, S
AF Roy, Ajit K.
Farmer, Barry L.
Varshney, Vikas
Sihn, Sangwook
Lee, Jonghoon
Ganguli, Sabyasachi
TI Importance of Interfaces in Governing Thermal Transport in Composite
Materials: Modeling and Experimental Perspectives
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE thermal management; interface thermal resistance; multiscale modeling;
nanocomposites; thermal conductivity; thermal interface materials
ID NONEQUILIBRIUM MOLECULAR-DYNAMICS; FIBER-REINFORCED COMPOSITES;
HEAT-CONDUCTION; CRACKED BODIES; RESISTANCE; SIMULATION; PREDICTION;
FILMS; INHOMOGENEITIES; NANOCOMPOSITES
AB Thermal management in polymeric composite materials has become increasingly critical in the air-vehicle industry because of the increasing thermal load in small-scale composite devices extensively used in electronics and aerospace systems. The thermal transport phenomenon in these small-scale heterogeneous systems is essentially controlled by the interface thermal resistance because of the large surface-to. volume ratio, In this review article, several modeling strategies, are discussed for different length scales, complemented by our experimental efforts to tailor the thermal transport properties of polymeric composite materials. Progress in the molecular modeling of thermal transport in thermosets is reviewed along with a discussion on the interface thermal resistance between functionalized carbon nanotube and epoxy resin systems. For the thermal transport in fiber-reinforced composites, various micromechanics-based analytical and numerical modeling schemes are reviewed in predicting the transverse thermal conductivity. Numerical schemes used to realize and scale the interface thermal resistance and the finite mean free path of the energy carrier in the mesoscale are discussed in the frame of the lattice Boltzmann-Peierls-Callaway equation. Finally, guided by modeling, complementary experimental efforts are discussed for exfoliated graphite and vertically aligned nanotubes based composites toward improving their effective thermal conductivity by tailoring interface thermal resistance.
C1 [Roy, Ajit K.; Varshney, Vikas; Sihn, Sangwook; Lee, Jonghoon; Ganguli, Sabyasachi] USAF, Thermal Sci & Mat Branch, Mat & Mfg Directorate, Res Lab, Dayton, OH 45433 USA.
[Varshney, Vikas; Lee, Jonghoon] Universal Technol Corp, Dayton, OH 45432 USA.
[Sihn, Sangwook; Ganguli, Sabyasachi] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
RP Roy, AK (reprint author), USAF, Thermal Sci & Mat Branch, Mat & Mfg Directorate, Res Lab, Dayton, OH 45433 USA.
EM Ajit.Roy@wpafb.af.mil; Barry.Farmer@wpafb.af.mil
FU Air Force Office of Scientific Research [2302BR7P, 2306AR8P, 2306CR9P]
FX The authors are grateful to Air Force Office of Scientific Research (Lab
Tasks: 2302BR7P, 2306AR8P, 2306CR9P) for the funding support. The
authors also thank Dr. Jennifer Wohlwend for the thorough, critical
reading, and her suggestions regarding the manuscript.
NR 62
TC 26
Z9 26
U1 1
U2 72
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD FEB
PY 2012
VL 4
IS 2
BP 545
EP 563
DI 10.1021/am201496z
PG 19
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 897IW
UT WOS:000300644500008
PM 22295993
ER
PT J
AU Jarosz, PR
Shaukat, A
Schauerman, CM
Cress, CD
Kladitis, PE
Ridgley, RD
Landi, BJ
AF Jarosz, Paul R.
Shaukat, Aalyia
Schauerman, Christopher M.
Cress, Cory D.
Kladitis, Paul E.
Ridgley, Richard D.
Landi, Brian J.
TI High-Performance, Lightweight Coaxial Cable from Carbon Nanotube
Conductors
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE carbon nanotubes; lightweight coaxial cable; attenuation; high
frequency; chemical treatment; performance enhancement
ID ELECTRICAL-CONDUCTIVITY; FIBERS; TRANSPORT; YARNS; FILMS
AB Coaxial cables have been constructed with carbon nanotube (CNT) materials serving as both the inner and outer conductors. Treatment of the CNT outer and inner conductors with KAuBr4 was found to significantly reduce the attenuation of these cables, which demonstrates that chemical agents can be used to improve. power transmission through CNT networks at high frequencies (150 kHz-3 GHz). For cables constructed with a KAuBr4-treated CNT outer conductor, power attenuation per length approaches parity with cables constructed from metallic conductors at significantly lower weight per length (i.e., 7.1 g/m for CNT designs compared to 38.8 g/m for an RG-58 design). A relationship between the thickness of the CNT outer conductor and the cable attenuation was observed and used to estimate the effective skin depth at high frequency. These results establish reliable, reproducible methods for the construction of coaxial cables from CNT materials that can facilitate further investigation of their performance in high frequency transmission structures, and highlight a specific opportunity for significant reduction in coaxial cable mass.
C1 [Landi, Brian J.] Rochester Inst Technol, Dept Chem & Biomed Engn, Golisano Inst Sustainabil, NanoPower Res Labs, Rochester, NY 14623 USA.
[Cress, Cory D.] USN, Res Lab, Washington, DC 20375 USA.
[Kladitis, Paul E.] USAF, Dept Elect Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Landi, BJ (reprint author), Rochester Inst Technol, Dept Chem & Biomed Engn, Golisano Inst Sustainabil, NanoPower Res Labs, Rochester, NY 14623 USA.
EM brian.landi@rit.edu
OI Cress, Cory/0000-0001-7563-6693
FU Tyco Electronics; U.S. Government; Intelligence Community; Office of the
Director of National Intelligence; Defense Threat Reduction Agency
(DTRA) [HDTRA-1-10-1-0122]
FX The authors acknowledge Tyco Electronics for partial support and
technical discussions. The authors gratefully acknowledge financial
support from the U.S. Government, including a grant from the
Intelligence Community Postdoctoral Research Fellowship Program through
funding from the Office of the Director of National Intelligence, as
well as the Defense Threat Reduction Agency (DTRA) under Grant
HDTRA-1-10-1-0122. The authors also thank Nanocomp Technologies, Inc.
for providing CNT materials used in this effort.
NR 38
TC 12
Z9 13
U1 8
U2 37
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD FEB
PY 2012
VL 4
IS 2
BP 1103
EP 1109
DI 10.1021/am201729g
PG 7
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 897IW
UT WOS:000300644500087
PM 22272936
ER
PT J
AU Lin, Y
Bunker, CE
Fernando, KAS
Connell, JW
AF Lin, Yi
Bunker, Christopher E.
Fernando, K. A. Shiral
Connell, John W.
TI Aqueously Dispersed Silver Nanoparticle-Decorated Boron Nitride
Nanosheets for Reusable, Thermal Oxidation-Resistant Surface Enhanced
Raman Spectroscopy (SERS) Devices
SO ACS APPLIED MATERIALS & INTERFACES
LA English
DT Article
DE boron nitride nanosheets; nanometal decoration; reusable; SERS; wet
transfer
ID CARBON NANOTUBES; GRAPHENE OXIDE; METAL NANOPARTICLES; PHOTOCATALYTIC
REDUCTION; ANCHORING SEMICONDUCTOR; SCATTERING; FILM; GOLD; LAYER;
NANORIBBONS
AB The impurity-free aqueous dispersions of boron nitride nanosheets (BNNS) allowed the facile preparation of silver (Ag) nanoparticle-decorated BNNS by chemical reduction of an Ag salt with hydrazine. in the presence of BNNS. The resultant Ag BNNS nanohybrids remained dispersed in water, allowing convenient subsequent solution processing. By using substrate transfer techniques, Ag BNNS nanohybrid thin film coatings on quartz substrates were prepared and evaluated as reusable surface enhanced Raman spectroscopy (SERS) sensors that were robust against repeated solvent washing. In addition, because ofthe unique thermal oxidation-resistant properties of the BNNS, the sensor devices may be readily recycled by short-duration high temperature air oxidation to remove residual analyte molecules in repeated runs. The limiting factor associated with the thermal oxidation recycling process was the Ostwald ripening effect of Ag nanostructures.
C1 [Lin, Yi] Natl Inst Aerosp, Hampton, VA 23666 USA.
[Bunker, Christopher E.] USAF, Prop Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Fernando, K. A. Shiral] Univ Dayton, Res Inst, Nanotechnol Grp, Dayton, OH 45433 USA.
[Connell, John W.] NASA, Langley Res Ctr, Adv Mat & Proc Branch, Hampton, VA 23681 USA.
RP Lin, Y (reprint author), Natl Inst Aerosp, 100 Explorat Way, Hampton, VA 23666 USA.
EM yi.lin-1@nasa.gov; christopher.bunker@wpafb.af.mil;
john.w.connell@nasa.gov
NR 64
TC 62
Z9 63
U1 8
U2 144
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1944-8244
J9 ACS APPL MATER INTER
JI ACS Appl. Mater. Interfaces
PD FEB
PY 2012
VL 4
IS 2
BP 1110
EP 1117
DI 10.1021/am201747d
PG 8
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary
SC Science & Technology - Other Topics; Materials Science
GA 897IW
UT WOS:000300644500088
PM 22280102
ER
PT J
AU Hsiao, YC
Dzau, JR
Flemmons, MS
Asrani, S
Jones, S
Freedman, SF
AF Hsiao, Ya-Chuan
Dzau, Jacqueline R.
Flemmons, Meghan S.
Asrani, Sanjay
Jones, Sarah
Freedman, Sharon F.
TI Home assessment of diurnal intraocular pressure in healthy children
using the Icare rebound tonometer
SO JOURNAL OF AAPOS
LA English
DT Article
ID SUSPECTED GLAUCOMA
AB BACKGROUND Although intraocular pressure (TOP) is known to vary with the circadian cycle in nonglaucomatous and glaucomatous eyes of adults, the clinical assessment of TOP often relies on periodic measurements obtained at office visits during daytime hours. Little has been reported on diurnal TOP patterns in healthy children. The purpose of this study was to evaluate diurnal TOP in normal eyes of healthy children with the Icare rebound tonometer and when recorded by a parent at home.
METHODS This was a prospective study of TOP in normal eyes of healthy children. Children were recruited from a pediatric eye clinic. A parent was instructed on the use of the Icare rebound tonometer by a study physician and demonstrated proficiency its use in the clinic, at which time a masked TOP reading was also made with Goldmann applanation by a different study clinician. Home IOPs were then obtained and recorded 6 times daily at 2- to 3-hours intervals during 2 consecutive days by a parent.
RESULTS A total of 22 normal eyes (of 11 children) were included. We found that children without glaucoma demonstrate mean diurnal TOP fluctuation of 4-6 mm Hg, with similar TOP between right and left eyes, fair repeatability between consecutive days, and a tendency for higher early morning and lower late evening IOP.
CONCLUSIONS Healthy children without glaucoma demonstrate some diurnal fluctuation in TOP, comparable with that reported in nonglaucomatous eyes of adults. This information should prove as comparative for assessment of TOP fluctuation in children with known or suspected glaucoma. (J AAPOS 2012;16:58-60)
C1 [Freedman, Sharon F.] Duke Eye Ctr, Dept Ophthalmol, Durham, NC 27710 USA.
[Hsiao, Ya-Chuan] Natl Yang Ming Univ, Taipei 112, Taiwan.
[Flemmons, Meghan S.] Wilford Hall USAF Med Ctr, Lackland AFB, TX USA.
RP Freedman, SF (reprint author), Duke Eye Ctr, Dept Ophthalmol, POB 3802, Durham, NC 27710 USA.
EM sharon.freedman@duke.edu
OI Freedman, Sharon/0000-0003-3615-3511
NR 10
TC 8
Z9 9
U1 0
U2 1
PU MOSBY-ELSEVIER
PI NEW YORK
PA 360 PARK AVENUE SOUTH, NEW YORK, NY 10010-1710 USA
SN 1091-8531
J9 J AAPOS
JI J. AAPOS
PD FEB
PY 2012
VL 16
IS 1
BP 58
EP 60
DI 10.1016/j.jaapos.2011.10.005
PG 3
WC Ophthalmology; Pediatrics
SC Ophthalmology; Pediatrics
GA 905VQ
UT WOS:000301304700015
PM 22370667
ER
PT J
AU Maass, R
Uchic, MD
AF Maass, R.
Uchic, M. D.
TI In-situ characterization of the dislocation-structure evolution in Ni
micro-pillars
SO ACTA MATERIALIA
LA English
DT Article
DE Micro-compression; Plastic deformation; Strain gradient; Single crystal;
Strain hardening
ID X-RAY MICRODIFFRACTION; SINGLE-CRYSTAL COPPER; MECHANICAL-PROPERTIES;
MICROPILLAR COMPRESSION; SUBMICROMETER-PILLARS; METALLIC MICROPILLARS;
NICKEL MICROCRYSTALS; SMALL-SCALE; WHITE-BEAM; PLASTICITY
AB The high strength of micro-crystals is determined in the early flow regime, where a transition from elastic to plastic flow is obscured if compared to stress strain data from bulk single crystals. In the present work we therefore focus on the evolution of dislocation structures in Ni micro-pillars during early deformation by employing in-situ Laue micro-diffraction. It will be shown that substantial changes in the lattice fine structure, such as multiple subgrain formation and significant rotational gradients, can be resolved prior to the onset of large strain generation. The results reveal more pronounced effects for smaller sample dimensions and also suggest that most of the evolving dislocation structure is formed prior to the occurrence of large strain bursts. A clear increase in dislocation density as a function of strain is observed, which we discuss in the context of size-dependent strain hardening and exhaustion hardening. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
C1 [Maass, R.] Paul Scherrer Inst, CH-5232 Villigen, Switzerland.
[Uchic, M. D.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Maass, R (reprint author), CALTECH, Div Engn & Appl Sci, 1200 E Calif Blvd,MC 309-81, Pasadena, CA 91125 USA.
EM maass@caltech.edu
RI Maass, Robert/F-6306-2011
FU Alexander von Humboldt foundation
FX R.M. gratefully acknowledges the splendid support of the MicroXAS
beamline crew at the Swiss Light Source: D. Grolimund, C. Borca, and M.
Willimann. Thanks go also to the Materials Science and Simulation group
at the Paul Scherrer Institute: H. Van Swygenhoven, S. Van Petegem, J.
Zimmermann, Stefan Brandstetter and Christian Brandl. Further, R.M.
would like to acknowledge the support of Hysitron Inc. for technical
support of the MCD-development. Gratitude is expressed towards P.M.
Derlet and C.P. Frick for valuable discussions. R.M. also thanks the
Alexander von Humboldt foundation for financial support at his current
affiliation.
NR 60
TC 29
Z9 29
U1 4
U2 65
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 1359-6454
J9 ACTA MATER
JI Acta Mater.
PD FEB
PY 2012
VL 60
IS 3
BP 1027
EP 1037
DI 10.1016/j.actamat.2011.11.007
PG 11
WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical
Engineering
SC Materials Science; Metallurgy & Metallurgical Engineering
GA 903YA
UT WOS:000301157900025
ER
PT J
AU Lacey, TH
Mills, RF
Mullins, BE
Raines, RA
Oxley, ME
Rogers, SK
AF Lacey, T. H.
Mills, R. F.
Mullins, B. E.
Raines, R. A.
Oxley, M. E.
Rogers, S. K.
TI RIPsec - Using reputation-based multilayer security to protect MANETs
SO COMPUTERS & SECURITY
LA English
DT Article
DE MANET; Ad-hoc; IPsec; DSR; Multipath; Behavior grading; Reputation;
Trust; PKI
ID AD HOC NETWORKS
AB This paper examines the theory, application, and results for a Reputation-Based Internet Protocol Security (RIPsec) framework that provides security for a Mobile Ad-hoc Network (MANET) operating in a hostile environment. While there has been significant research in MANET security, the research has tended to address subsets of the overall security challenge. RIPsec leverages existing technologies to provide an overarching layered security framework that provides a more comprehensive security solution than existing approaches. Protection from external threats is provided in the form of encrypted links and encryption-wrapped nodes while internal threats are mitigated by behavior grading that assigns reputations to nodes based on their demonstrated participation in the routing process. End-to-end message security using public and private certificates protects against both internal and external threats. Network availability is improved by behavior grading and round-robin multipath routing.
Simulation results showed that the number of routing errors sent in a MANET was reduced by an average of 52% when using RIPsec. The cost in network performance for the security provided by RIPsec was a reduction in throughput. However, the reduction was acceptable given the increase in security. The network load was also reduced, decreasing the overall traffic introduced into the MANET and permitting individual nodes to perform more work without overtaxing their limited resources.
The RIPsec framework was analyzed to demonstrate its robustness against a number of well-known attacks against ad-hoc networks. Of the four features incorporated into RIPsec (encryption, IPsec transport mode, behavior grading, and multipath routing), three other frameworks incorporated two of the features (encryption and behavior grading), and the remaining eight frameworks only incorporated one of the four security features. The incorporation of all four security features at multiple levels makes RIPsec very robust against attacks. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Lacey, T. H.; Mills, R. F.; Mullins, B. E.; Raines, R. A.; Oxley, M. E.; Rogers, S. K.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
RP Lacey, TH (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM timothy.lacey.ctr@afit.edu
NR 30
TC 6
Z9 6
U1 0
U2 8
PU ELSEVIER ADVANCED TECHNOLOGY
PI OXFORD
PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON,
OXFORD OX5 1GB, OXON, ENGLAND
SN 0167-4048
J9 COMPUT SECUR
JI Comput. Secur.
PD FEB
PY 2012
VL 31
IS 1
BP 122
EP 136
DI 10.1016/j.cose.2011.09.005
PG 15
WC Computer Science, Information Systems
SC Computer Science
GA 902AT
UT WOS:000301011700011
ER
PT J
AU Dube, T
Raines, R
Peterson, G
Bauer, K
Grimaila, M
Rogers, S
AF Dube, T.
Raines, R.
Peterson, G.
Bauer, K.
Grimaila, M.
Rogers, S.
TI Malware target recognition via static heuristics
SO COMPUTERS & SECURITY
LA English
DT Article
DE Malware detection; Intrusion detection; Malware; Situation awareness;
Machine learning
ID MALICIOUS EXECUTABLES
AB Organizations increasingly rely on the confidentiality, integrity and availability of their information and communications technologies to conduct effective business operations while maintaining their competitive edge. Exploitation of these networks via the introduction of undetected malware ultimately degrades their competitive edge, while taking advantage of limited network visibility and the high cost of analyzing massive numbers of programs. This article introduces the novel Malware Target Recognition (MaTR) system which combines the decision tree machine learning algorithm with static heuristic features for malware detection. By focusing on contextually important static heuristic features, this research demonstrates superior detection results. Experimental results on large sample datasets demonstrate near ideal malware detection performance (99.9+% accuracy) with low false positive (8.73e-4) and false negative rates (8.03e-4) at the same point on the performance curve. Test results against a set of publicly unknown malware, including potential advanced competitor tools, show MaTR's superior detection rate (99%) versus the union of detections from three commercial antivirus products (60%). The resulting model is a fine granularity sensor with potential to dramatically augment cyberspace situation awareness. Published by Elsevier Ltd.
C1 [Dube, T.; Raines, R.; Peterson, G.; Bauer, K.; Grimaila, M.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Rogers, S.] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Rogers, S.] USAF, Informat Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Dube, T (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM thomas.dube@afit.edu
NR 34
TC 4
Z9 4
U1 1
U2 7
PU ELSEVIER ADVANCED TECHNOLOGY
PI OXFORD
PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON,
OXFORD OX5 1GB, OXON, ENGLAND
SN 0167-4048
J9 COMPUT SECUR
JI Comput. Secur.
PD FEB
PY 2012
VL 31
IS 1
BP 137
EP 147
DI 10.1016/j.cose.2011.09.002
PG 11
WC Computer Science, Information Systems
SC Computer Science
GA 902AT
UT WOS:000301011700012
ER
PT J
AU Stuckey, NC
Vasquez, JR
Graham, SR
Hopkinson, KM
Maybeck, PS
AF Stuckey, N. C.
Vasquez, J. R.
Graham, S. R.
Hopkinson, K. M.
Maybeck, P. S.
TI Stochastic control of computer networks
SO IET CONTROL THEORY AND APPLICATIONS
LA English
DT Article
AB Although transmission control protocol (TCP) is a proven protocol in networks with congestion-dominated packet losses, it is a poor match for mobile networks with bit-error-dominated packet losses. This article considers a control theoretic approach for more effective flow control in reliable network transmissions. An extended Kalman filter is developed to estimate two key network state indicators: individual queue sizes and packet arrival rates to each queue. A source node estimates these parameters for each of the downstream queues currently servicing packet streams originating from itself. These estimates can be used by an linear quadratic Gaussian (LQG) 'steady-state' linear perturbation proportional-plus-integral (PI) controller to regulate the size of downstream queues by altering the packet rate sent towards a particular downstream queue. Although this work demonstrates the effects of a single controller, it is anticipated that a network wide deployment could achieve significant throughput and stability benefits. The primary contributions of this work include: (a) development of the necessary Kalman filter theory, (b) design of a network state estimator using a transient queue behaviour model, (c) equations for the LQG synthesis of a steady-state linear perturbation PI controller and (d) demonstration of the resulting controller performance, which shows significant improvement over traditional TCP implementations.
C1 [Stuckey, N. C.] White House Commun Agcy, Joint Base Anacostia Bol, DC 20373 USA.
[Vasquez, J. R.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Graham, S. R.; Hopkinson, K. M.; Maybeck, P. S.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Stuckey, NC (reprint author), White House Commun Agcy, Joint Base Anacostia Bol, DC 20373 USA.
EM kenneth.hopkinson@afit.edu
OI Graham, Scott/0000-0003-0193-1192
NR 9
TC 1
Z9 2
U1 0
U2 1
PU INST ENGINEERING TECHNOLOGY-IET
PI HERTFORD
PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD SG1 2AY, ENGLAND
SN 1751-8644
J9 IET CONTROL THEORY A
JI IET Contr. Theory Appl.
PD FEB
PY 2012
VL 6
IS 3
BP 403
EP 411
DI 10.1049/iet-cta.2010.0432
PG 9
WC Automation & Control Systems; Engineering, Electrical & Electronic;
Instruments & Instrumentation
SC Automation & Control Systems; Engineering; Instruments & Instrumentation
GA 899UM
UT WOS:000300841900008
ER
PT J
AU Coppage, R
Slocik, JM
Briggs, BD
Frenkel, AI
Naik, RR
Knecht, MR
AF Coppage, Ryan
Slocik, Joseph M.
Briggs, Beverly D.
Frenkel, Anatoly I.
Naik, Rajesh R.
Knecht, Marc R.
TI Determining Peptide Sequence Effects That Control the Size, Structure,
and Function of Nanoparticles
SO ACS NANO
LA English
DT Article
DE bionanotechnology; peptide; biomimetic; catalysis; Pd nanoparticle
ID PALLADIUM NANOPARTICLES; GOLD; BINDING; SUPERSTRUCTURES; SIMULATION;
STABILITY; MECHANISM; SURFACES; VIEW
AB The ability to tune the size, shape, and Composition of nanomaterials at length soles <10 nm remains a challenging task. Such capabilities are required to fully realize the application of nanotechnology for catalysis, energy storage, and biomedical technologies. Conversely, nature employs biomacromolecules such as proteins and peptides as highly specific nanoparticle ligands that demonstrate exacting precision over the particle morphology through controlling the biotic/abiotic interface. Here we demonstrate the ability to finely tune the size, surface structure, and functionality of single-crystal Pd nanoparticles between 2 and 3 nm using materials directing peptides. This was achieved by selectively altering the peptide sequence to change the binding motif, which in turn modifies the surface structure of the particles. The materials were fully characterized before and after reduction using atomically resolved spectroscopic and microscopic analyses, which indicated that the coordination environment prior to reduction significantly affects the structure of the final nanoparticles. Additionally, changes to the particle surface structure, as a function of peptide sequence, can allow for chloride ion coordination that alters the catalytic abilities of the materials for the C-C coupling Stille reaction. These results suggest that peptide-based approaches may be able to achieve control over the structure/function relationship of nanomaterials where the peptide sequence could be used to selectivity tune such capabilities.
C1 [Frenkel, Anatoly I.] Yeshiva Univ, Dept Phys, New York, NY 10016 USA.
[Coppage, Ryan; Briggs, Beverly D.; Knecht, Marc R.] Univ Miami, Dept Chem, Coral Gables, FL 33146 USA.
[Slocik, Joseph M.; Naik, Rajesh R.] USAF, Nanostruct & Biol Mat Branch, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Frenkel, AI (reprint author), Yeshiva Univ, Dept Phys, 245 Lexington Ave, New York, NY 10016 USA.
EM anatoly.frenkel@yu.edu; rajesh.naik@wpafb.af.mil; knecht@miami.edu
RI Frenkel, Anatoly/D-3311-2011
OI Frenkel, Anatoly/0000-0002-5451-1207
FU National Science Foundation [CBET-1157431]; Air Office of Scientific
Research; U.S. Department of Energy [FG02-03ER15476]; Synchrotron
Catalysis Consortium, U.S. Department of Energy [FG02-05ER15688];
Research Challenge Trust Fund
FX This material is based upon work supported by the National Science
Foundation under Grant No. CBET-1157431(M.K.) and by the Air Office of
Scientific Research (R.N.). A.I.F. acknowledges support by U.S.
Department of Energy Grant DE-FG02-03ER15476. Beamline X18B at the NSLS
is supported in part by the Synchrotron Catalysis Consortium, U.S.
Department of Energy Grant No. DE-FG02-05ER15688. M.K. further
acknowledges support from the University of Miami. R.C. acknowledges
student fellowship support from the Research Challenge Trust Fund. The
authors are grateful to Dr. R. Vasic for help with XAFS measurements.
NR 31
TC 31
Z9 31
U1 7
U2 73
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1936-0851
J9 ACS NANO
JI ACS Nano
PD FEB
PY 2012
VL 6
IS 2
BP 1625
EP 1636
DI 10.1021/nn204600d
PG 12
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 898QW
UT WOS:000300757900073
PM 22276921
ER
PT J
AU Choi, HJ
Kang, JY
Jeon, IY
Eo, SM
Tan, LS
Baek, JB
AF Choi, Hyun-Jung
Kang, Ji-Ye
Jeon, In-Yup
Eo, Soo-Mi
Tan, Loon-Seng
Baek, Jong-Beom
TI Immobilization of platinum nanoparticles on 3,4-diaminobenzoyl-
functionalized multi-walled carbon nanotube and its electrocatalytic
activity
SO JOURNAL OF NANOPARTICLE RESEARCH
LA English
DT Article
DE Platinum nanoparticles; Multi-walled carbon nanotubes;
Functionalization; Electrocatalytic activity
ID POLY(PHOSPHORIC ACID); COMPOSITES; CATALYSTS; PURIFICATION; ELECTRODES;
DEPOSITION; REDUCTION; SYSTEMS; SURFACE; OXYGEN
AB Multi-walled carbon nanotubes (MWCNTs) are functionalized at the sp(2) C-H defect sites with 3,4-diaminobenzoic acid by a "direct" Friedel-Crafts acylation reaction in a mild polyphosphoric acid/phosphorous pentoxide medium. Owing to enhanced surface polarity, the resulting 3,4-diaminobenzoyl-functionalized MWCNTs (DAB-MWCNT) are highly dispersible in polar solvents, such as ethanol, N-methyl-2-pyrrolidone, and methanesulfonic acid. The absorption and emission properties of DAB-MWCNT in solution state are qualitatively shown to be sensitive to the pH in the environment. The DAB-MWCNT is used as a stable platform on which to deposit platinum nanoparticles (PNP). The PNP/DAB-MWCNT hybrid displays high electrocatalytic activity with good electrochemical stability for an oxygen reduction reaction under an alkaline condition.
C1 [Choi, Hyun-Jung; Kang, Ji-Ye; Jeon, In-Yup; Eo, Soo-Mi; Baek, Jong-Beom] Ulsan Natl Inst Sci & Technol, Interdisciplinary Sch Green Energy, Inst Adv Mat & Devices, Ulsan 689798, South Korea.
[Tan, Loon-Seng] USAF, Nanostruct & Biol Mat Branch, AFRL RXBN Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Baek, JB (reprint author), Ulsan Natl Inst Sci & Technol, Interdisciplinary Sch Green Energy, Inst Adv Mat & Devices, Ulsan 689798, South Korea.
EM jbbaek@unist.ac.kr
RI Baek, Jong-Beom/E-5883-2010; Tan, Loon-Seng/F-6985-2012
OI Baek, Jong-Beom/0000-0003-4785-2326; Tan, Loon-Seng/0000-0002-2134-9290
FU World Class University (WCU); US-Korea NBIT; Basic Research Laboratory
(BRL); National Research Foundation (NRF); Ministry of Education,
Science and Technology (MEST) of Korea; US Air Force Office of
Scientific Research; Asian Office of Aerospace RD (AFOSR-AOARD)
FX This project was supported by funding from World Class University (WCU),
US-Korea NBIT, and Basic Research Laboratory (BRL) programs supported by
the National Research Foundation (NRF) and the Ministry of Education,
Science and Technology (MEST) of Korea, US Air Force Office of
Scientific Research, and Asian Office of Aerospace R&D (AFOSR-AOARD).
NR 38
TC 1
Z9 1
U1 1
U2 16
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 1388-0764
EI 1572-896X
J9 J NANOPART RES
JI J. Nanopart. Res.
PD FEB
PY 2012
VL 14
IS 2
AR 704
DI 10.1007/s11051-011-0704-5
PG 11
WC Chemistry, Multidisciplinary; Nanoscience & Nanotechnology; Materials
Science, Multidisciplinary
SC Chemistry; Science & Technology - Other Topics; Materials Science
GA 895RY
UT WOS:000300515200026
ER
PT J
AU Dudley, JG
Ukeiley, L
AF Dudley, Jonathan G.
Ukeiley, Lawrence
TI Numerical Investigation of a Cylinder Immersed in a Supersonic Boundary
Layer
SO AIAA JOURNAL
LA English
DT Article; Proceedings Paper
CT 15th AIAA/CEAS Aeroacoustics Conference
CY MAY 11-13, 2009
CL Miami, FL
SP Amer Inst Aeronaut & Astronaut (AIAA), CEAS
ID DETACHED-EDDY SIMULATIONS; CIRCULAR-CYLINDER; PLANE SURFACE; CROSS-FLOW;
CAVITY; FORCES; WALL
AB Detached-eddy simulations have been carried out for flow past a circular cylinder in close proximity to a planar wall within a supersonic boundary layer. Four gap heights and two rod diameters with a boundary-layer-to-rod-diameter ratio less than unity were considered for the investigation. The focus. of the effort was on the behavior of the flow in the cylinder wake and its interaction with the flat plate boundary layer. The present work reveals a strong effect of the gap ratio and rod diameter on the behavior of this interaction. The investigation indicates strong von Karman-type vortex shedding exists only when the cylinder is placed in close proximity to the wall. The results further illustrate the forward stagnation point moves from the upper to lower quadrant of the cylinder as the gap height is increased, resulting in a significant separated boundary layer on the floor aft of the cylinder.
C1 [Dudley, Jonathan G.] USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
[Ukeiley, Lawrence] Univ Florida, Shalimar, FL 32579 USA.
RP Dudley, JG (reprint author), USAF, Res Lab, Munit Directorate, Eglin AFB, FL 32542 USA.
RI Ukeiley, Lawrence/A-4268-2009;
OI Ukeiley, Lawrence/0000-0001-8080-3249
NR 28
TC 1
Z9 1
U1 0
U2 5
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 0001-1452
J9 AIAA J
JI AIAA J.
PD FEB
PY 2012
VL 50
IS 2
BP 257
EP 270
DI 10.2514/1.J050647
PG 14
WC Engineering, Aerospace
SC Engineering
GA 882TO
UT WOS:000299587000001
ER
PT J
AU Bebarta, VS
Maddry, J
Borys, DJ
Morgan, DL
AF Bebarta, Vikhyat S.
Maddry, Joseph
Borys, Doug J.
Morgan, David L.
TI Incidence of tricyclic antidepressant-like complications after
cyclobenzaprine overdose
SO AMERICAN JOURNAL OF EMERGENCY MEDICINE
LA English
DT Letter
C1 [Bebarta, Vikhyat S.] Wilford Hall USAF Med Ctr, Dept Emergency Med, San Antonio, TX 78261 USA.
[Maddry, Joseph] Wilford Hall USAF Med Ctr, San Antonio Uniformed Serv, Hlth Educ Consortium, San Antonio, TX 78261 USA.
[Borys, Doug J.] Cent Texas Poison Ctr, Temple, TX USA.
[Morgan, David L.] Texas A&M Univ Hlth Sci Ctr, Scott & White Hosp, Coll Med, Temple, TX USA.
RP Bebarta, VS (reprint author), Wilford Hall USAF Med Ctr, Dept Emergency Med, San Antonio, TX 78261 USA.
EM vikbebarta@yahoo.com; joseph.maddry@gmail.com; DBORYS@swmail.sw.org;
dlmorgan@swmail.sw.org
NR 3
TC 0
Z9 0
U1 0
U2 0
PU W B SAUNDERS CO-ELSEVIER INC
PI PHILADELPHIA
PA 1600 JOHN F KENNEDY BOULEVARD, STE 1800, PHILADELPHIA, PA 19103-2899 USA
SN 0735-6757
J9 AM J EMERG MED
JI Am. J. Emerg. Med.
PD FEB
PY 2012
VL 30
IS 2
BP 374
EP 374
DI 10.1016/j.ajem.2011.09.005
PG 1
WC Emergency Medicine
SC Emergency Medicine
GA 891SP
UT WOS:000300237200020
PM 22100463
ER
PT J
AU Morrison, JJ
Dubose, JJ
Rasmussen, TE
Midwinter, MJ
AF Morrison, Jonathan J.
Dubose, Joseph J.
Rasmussen, Todd E.
Midwinter, Mark J.
TI Military Application of Tranexamic Acid in Trauma Emergency
Resuscitation (MATTERs) Study
SO ARCHIVES OF SURGERY
LA English
DT Article
ID PLACEBO-CONTROLLED TRIAL; CARDIAC-SURGERY; INJURY SEVERITY; TRANSFUSION;
SCORE; PROPHYLAXIS; DEATH; WAR
AB Objectives: To characterize contemporary use of tranexamic acid (TXA) in combat injury and to assess the effect of its administration on total blood product use, thromboembolic complications, and mortality.
Design: Retrospective observational study comparing TXA administration with no TXA in patients receiving at least 1 unit of packed red blood cells. A subgroup of patients receiving massive transfusion (>= 10 units of packed red blood cells) was also examined. Univariate and multivariate regression analyses were used to identify parameters associated with survival. Kaplan-Meier life tables were used to report survival.
Setting: A Role 3 Echelon surgical hospital in southern Afghanistan.
Patients: A total of 896 consecutive admissions with combat injury, of which 293 received TXA, were identified from prospectively collected UK and US trauma registries.
Main Outcome Measures: Mortality at 24 hours, 48 hours, and 30 days as well as the influence of TXA administration on postoperative coagulopathy and the rate of thromboembolic complications.
Results: The TXA group had lower unadjusted mortality than the no-TXA group (17.4% vs 23.9%, respectively; P = .03) despite being more severely injured (mean [SD] Injury Severity Score, 25.2 [16.6] vs 22.5 [18.5], respectively; P < .001). This benefit was greatest in the group of patients who received massive transfusion (14.4% vs 28.1%, respectively; P = .004), where TXA was also independently associated with survival (odds ratio = 7.228; 95% CI, 3.016-17.322) and less coagulopathy (P = .003).
Conclusions: The use of TXA with blood component-based resuscitation following combat injury results in improved measures of coagulopathy and survival, a benefit that is most prominent in patients requiring massive transfusion. Treatment with TXA should be implemented into clinical practice as part of a resuscitation strategy following severe wartime injury and hemorrhage.
C1 [Rasmussen, Todd E.] USA, Inst Surg Res, USAF Med Corps, Ft Sam Houston, TX 78234 USA.
[Dubose, Joseph J.; Rasmussen, Todd E.] USAF, Med Serv, Sci & Technol Sect, Lackland AFB, TX USA.
[Morrison, Jonathan J.; Midwinter, Mark J.] New Queen Elizabeth Hosp, Natl Inst Hlth Res, Birmingham, W Midlands, England.
[Morrison, Jonathan J.; Midwinter, Mark J.] Royal Ctr Def Med, Acad Dept Mil Surg & Trauma, Birmingham, W Midlands, England.
[Rasmussen, Todd E.] Uniformed Serv Univ Hlth Sci, Norman M Rich Dept Surg, Bethesda, MD 20814 USA.
RP Rasmussen, TE (reprint author), USA, Inst Surg Res, USAF Med Corps, 3400 Rawley E Chambers Ave,Ste B, Ft Sam Houston, TX 78234 USA.
EM todd.rasmussen@amedd.army.mil
RI Midwinter, Mark/P-6264-2015
OI Midwinter, Mark/0000-0003-1836-7137
FU Office of the US Air Force Surgeon General; Air Force Medical Support
Agency
FX This work was supported by the Office of the US Air Force Surgeon
General and was created in the performance of a contract with the Air
Force Medical Support Agency.
NR 27
TC 193
Z9 196
U1 1
U2 20
PU AMER MEDICAL ASSOC
PI CHICAGO
PA 515 N STATE ST, CHICAGO, IL 60654-0946 USA
SN 0004-0010
J9 ARCH SURG-CHICAGO
JI Arch. Surg.
PD FEB
PY 2012
VL 147
IS 2
BP 113
EP 119
DI 10.1001/archsurg.2011.287
PG 7
WC Surgery
SC Surgery
GA 895VJ
UT WOS:000300524500005
PM 22006852
ER
PT J
AU Reyes, JA
Habash, ML
Taylor, RP
AF Reyes, Joel A.
Habash, Michelle L.
Taylor, Richard P.
TI Femoral central venous catheters are not associated with higher rates of
infection in the pediatric critical care population
SO AMERICAN JOURNAL OF INFECTION CONTROL
LA English
DT Article
DE Nosocomial infection; Catheter-related infections; Intensive care units
ID BLOOD-STREAM INFECTION; RISK-FACTORS; ILL PATIENTS; UNIT; COMPLICATIONS;
MORTALITY; CHILDREN; OUTCOMES
AB Background: Adult data show a difference in central venous catheter (CVC) infection rates between 3 major sites: subclavian (SC), internal jugular (IJ), and femoral veins. We hypothesized that in patients in pediatric intensive care units (PICUs), there is no difference in rates of CVC infection among these three sites, but specifically the femoral compared to all other sites.
Methods: In this retrospective cohort study, data from January 1999 to January 2008 were collected prospectively for internal review and quality assurance. All PICU patients with a CVC were enrolled. The rate of CVC infection was determined using Cox regression survival analysis to account for various durations of CVC placement at the various sites, then adjusted for severity of illness, number of lumens, and patient age. Mortality was compared in patients with a CVC infection versus those without.
Results: A total of 4,512 patients with a CVC were enrolled. No site was associated with an increased risk of infection compared with the other sites, with hazard ratios of 0.951 (95% confidence interval [CI], 0.612-1.478) for the SC site, 0.956 (95% CI, 0.593-1.541) for the IJ site, and 1.120 (95% CI, 0.753-1.665) for the femoral site. No significant association between mortality and presence of CVC infection was found when adjusted for age, severity of illness, and duration of CVC placement. An association was found between the presence of a CVC infection and prolonged PICU length of stay (3.98 days longer; P < .001).
Conclusion: Femoral CVCs are not associated with higher rates of infection in the PICU. In addition, the presence of CVC infection does not affect mortality, but is associated with longer PICU admission. Published by Elsevier Inc. on behalf of the Association for Professionals in Infection Control and Epidemiology, Inc.
C1 [Reyes, Joel A.] Univ Texas Hlth Sci Ctr San Antonio, Dept Pediat, Div Crit Care, San Antonio, TX 78229 USA.
[Reyes, Joel A.; Habash, Michelle L.; Taylor, Richard P.] Wilford Hall USAF Med Ctr, Dept Pediat, Lackland AFB, TX USA.
RP Reyes, JA (reprint author), Univ Texas Hlth Sci Ctr San Antonio, Dept Pediat, Div Crit Care, 7703 Floyd Curl Dr,MC 7829, San Antonio, TX 78229 USA.
EM reyesj3@uthscsa.edu
NR 25
TC 9
Z9 10
U1 1
U2 5
PU MOSBY-ELSEVIER
PI NEW YORK
PA 360 PARK AVENUE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0196-6553
J9 AM J INFECT CONTROL
JI Am. J. Infect. Control
PD FEB
PY 2012
VL 40
IS 1
BP 43
EP 47
DI 10.1016/j.ajic.2011.02.011
PG 5
WC Public, Environmental & Occupational Health; Infectious Diseases
SC Public, Environmental & Occupational Health; Infectious Diseases
GA 891CW
UT WOS:000300195000009
PM 21704431
ER
PT J
AU Palmer, MJ
Johnson, RW
Autry, T
Aguirre, R
Lee, V
Scofield, JD
AF Palmer, Michael J.
Johnson, R. Wayne
Autry, Tracy
Aguirre, Rizal
Lee, Victor
Scofield, James D.
TI Silicon Carbide Power Modules for High-Temperature Applications
SO IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
LA English
DT Article
DE Hermetic power package; high current switching; high-temperature
operation; SiC die attach
ID ELECTRONICS
AB A hermetic multichip power package for silicon carbide devices that will operate at 200 degrees C ambient and switch 50-100 A has been developed. The Al2O3/MoCu structure, in which the SiC junction field-effect transistors and diodes are attached, was designed to hermetically seal the device areas. Details of the materials and processes used to fabricate the package are discussed. Die attach, ribbon bonding, and lid attach, as well as thermal modeling, electrical testing, and thermal cycling results are also described.
C1 [Palmer, Michael J.; Johnson, R. Wayne] Auburn Univ, Dept Elect Commun Engn, Auburn, AL 36849 USA.
[Autry, Tracy; Aguirre, Rizal; Lee, Victor] Microsemi Corp, Irvine, CA 92614 USA.
[Scofield, James D.] USAF, Dept PRPE, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Palmer, MJ (reprint author), Auburn Univ, Dept Elect Commun Engn, Auburn, AL 36849 USA.
EM palmemj@auburn.edu; johnson@eng.auburn.edu; tautry@microsemi.com;
raguirre@microsemi.com; vlee@microsemi.com; james.scofield@wpafb.af.mil
FU Parker Aerospace Control Systems Division; Air Force Research Lab
[FA8650-07-C-2737]
FX This work was supported by a number of organizations, including the
Parker Aerospace Control Systems Division, which provided aerospace
actuation requirements and guidance for the Si CPSM to be demonstrated
in a representative laboratory environment, Air Force Research Lab,
which provided expert guidance through Program Manager J. Scofield,
SemiSouth Labs, which supplied SiC devices and performed the electrical
testing, Auburn University, which supplied high-temperature packaging
technology, and Microsemi Power Products Group, which supplied packaging
manufacturing. This work was funded in part by the Air Force Research
Lab, through the Silicon Carbide Power Switch Module Program, under
Contract FA8650-07-C-2737. Recommended for publication by Associate
Editor C. J. Bailey upon evaluation of reviewers' comments.
NR 21
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U1 0
U2 9
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 2156-3950
J9 IEEE T COMP PACK MAN
JI IEEE Trans. Compon. Pack. Manuf. Technol.
PD FEB
PY 2012
VL 2
IS 2
BP 208
EP 216
DI 10.1109/TCPMT.2011.2171343
PG 9
WC Engineering, Manufacturing; Engineering, Electrical & Electronic;
Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA 891DL
UT WOS:000300196600004
ER
PT J
AU Aihara, K
Chen, MJ
Chen, C
Pham, AVH
AF Aihara, Kunia
Chen, Morgan Jikang
Chen, Cheng
Pham, Anh-Vu H.
TI Reliability of Liquid Crystal Polymer Air Cavity Packaging
SO IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
LA English
DT Article
DE Cavities; liquid crystal polymer; organic; packaging
ID SURFACE-MOUNT PACKAGES; KA-BAND APPLICATIONS; LCP; TECHNOLOGY; DESIGN;
MEMS; RF
AB We present the development of liquid crystal polymer (LCP) packages and thermal compression sealing processes. We demonstrate the complete process for prototyping, sealing, and assembling a single-chip LCP package at microwave frequencies. Using the thermal compression technique, we achieve a measured fine leak rate of 3.7 x 10(-8) cc-atm/s of a LCP package cavity. We have conducted a series of environmental tests such as temperature cycling and 85 degrees C and 85% humidity. We demonstrated that LCP packages have passed major environmental tests and proved to be a reliable package platform.
C1 [Aihara, Kunia] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Chen, Morgan Jikang] Futurewei Technol, Santa Clara, CA 95050 USA.
[Chen, Cheng; Pham, Anh-Vu H.] Univ Calif Davis, Dept Elect & Comp Engn, Microwave Microsyst Lab, Davis, CA 95616 USA.
RP Aihara, K (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM kunia.aihara@gmail.com; chenmor@gmail.com; chgchen@ucdavis.edu;
pham@ece.ucdavis.edu
FU National Science Foundation; UC Micro
FX This work was supported in part by the National Science Foundation
CAREER Award and UC Micro. Recommended for publication by Associate
Editor D. Goyal upon evaluation of reviewers' comments.
NR 13
TC 11
Z9 11
U1 0
U2 3
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 2156-3950
J9 IEEE T COMP PACK MAN
JI IEEE Trans. Compon. Pack. Manuf. Technol.
PD FEB
PY 2012
VL 2
IS 2
BP 224
EP 230
DI 10.1109/TCPMT.2011.2178092
PG 7
WC Engineering, Manufacturing; Engineering, Electrical & Electronic;
Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA 891DL
UT WOS:000300196600006
ER
PT J
AU Cho, MG
Cooke, D
Ferguson, D
Garrett, HB
Hilgers, A
Lai, ST
Roussel, JF
Wheelock, A
AF Cho, Mengu
Cooke, David
Ferguson, Dale
Garrett, Henry B.
Hilgers, Alain
Lai, Shu T.
Roussel, Jean-Francois
Wheelock, Adrian
TI Special Issue on Spacecraft Charging Technology 2012
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Editorial Material
C1 [Cho, Mengu] Kyushu Inst Technol, Kitakyushu, Fukuoka 8048550, Japan.
[Cooke, David; Ferguson, Dale; Wheelock, Adrian] USAF, Res Lab, Albuquerque, NM 87117 USA.
[Garrett, Henry B.] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA.
[Hilgers, Alain] ESA, NL-2200 AG Noordwijk, Netherlands.
[Lai, Shu T.] MIT, Space Prop Lab, Cambridge, MA 02139 USA.
[Roussel, Jean-Francois] Off Natl Etud & Rech Aerosp, F-31055 Toulouse, France.
RP Cho, MG (reprint author), Kyushu Inst Technol, Kitakyushu, Fukuoka 8048550, Japan.
NR 0
TC 0
Z9 0
U1 1
U2 5
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD FEB
PY 2012
VL 40
IS 2
SI SI
BP 138
EP 138
DI 10.1109/TPS.2011.2180452
PN 1
PG 1
WC Physics, Fluids & Plasmas
SC Physics
GA 894LS
UT WOS:000300428800001
ER
PT J
AU Ferguson, DC
AF Ferguson, Dale C.
TI New Frontiers in Spacecraft Charging
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Plasma properties; space technology; space vehicles; surface charging
AB Spacecraft charging, as a field, is continually being recharged by new developments in understanding, new materials and technologies, and new approaches to both new and old problems. I will discuss some of the new frontiers in understanding spacecraft charging in this paper, as well as referencing relevant papers from the 11th Spacecraft Charging Technology Conference. Spacecraft charging is highly material-property dependent. For example, the secondary electron emission, photoemission, bulk electrical resistivity, and surface resistivity are important parameters that help determine the extent of spacecraft charging (both on the surface and inside the spacecraft) in any given environment. Our understanding of these material properties is one of the new frontiers in spacecraft charging. I will discuss how these fundamental material properties have been found to depend on the following: proper measurement techniques, temperature, radiation flux, electric field, surface treatment, surface contamination from plumes and outgassing, surface modification through arcing and vacuum exposure, and synergistic effects. Modeling of spacecraft charging is a second new frontier. New developments in modeling have both improved our understanding of spacecraft charging and enabled us to model situations that are dynamic and geometrically complex. New schemes for treating both space and time variations of fields, particle fluxes, and spectra have made our modeling more precise and accurate. Now, many more spacecraft are being launched into low Earth orbit and the radiation belts. Modeling charging effects more accurately in those orbits will become more important than ever. A third new frontier in spacecraft charging is novel mitigation techniques. Surface materials and simple passive devices that emit electrons as fast as they are collected seem to make real-time charge mitigation cheaply and reliably achievable for the first time. Novel solar cell configurations and coverglass materials promise to make arcing, both of the primary electrostatic discharge (ESD) type and sustained arcing between cells or strings, a thing of the past. Superconducting cables may obviate the high voltages that lead to arcing. New cooperation between spacecraft and solar array manufacturers and spacecraft charging experts may help to prevent the spacecraft charging mistakes of the past. Furthermore, the final frontier is dealing with new materials and higher power requirements. Lightweight spacecraft materials are, in some cases, prone to exacerbate charging or arcing and may allow transmission of electromagnetic interference into sensitive electronics. New solar cell active materials may increase the effects of arcing on solar cell and solar array performance, even for primary ESD events. Higher power requirements may require longer transmission cables, which may increase the need for higher voltages, making arcing more likely. If superconducting cables become a reality, magnetics may become very important for spacecraft control and stability. What will happen to a superconducting cable if it must carry the increased current in an arcing event of very short duration?
C1 USAF, Res Lab, Kirtland AFB, NM 87117 USA.
RP Ferguson, DC (reprint author), USAF, Res Lab, Kirtland AFB, NM 87117 USA.
EM dale.ferguson@kirtland.af.mil
FU U.S. Air Force Research Laboratory
FX Manuscript received February 28, 2011; revised July 15, 2011 and
September 13, 2011; accepted September 26, 2011. Date of publication
November 3, 2011; date of current version February 10, 2012. This work
was supported by the U.S. Air Force Research Laboratory.
NR 55
TC 10
Z9 10
U1 1
U2 11
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD FEB
PY 2012
VL 40
IS 2
SI SI
BP 139
EP 143
DI 10.1109/TPS.2011.2172635
PN 1
PG 5
WC Physics, Fluids & Plasmas
SC Physics
GA 894LS
UT WOS:000300428800002
ER
PT J
AU Dennison, JR
Evans, A
Fullmer, D
Hodges, JL
AF Dennison, J. R.
Evans, Amberly
Fullmer, Danielle
Hodges, Joshua L.
TI Charge-Enhanced Contamination and Environmental Degradation of MISSE-6
SUSpECS Materials
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Charging; contamination; materials; space environment effects
ID SPACECRAFT; STORAGE
AB The effects of prolonged exposure to the low Earth orbit space environment and charge-enhanced contamination on optical, thermal, and electron emission and transport properties of common spacecraft materials have been investigated by comparing pre- and postflight characterization measurements. The State of Utah Space Environment and Contamination Study (SUSpECS), deployed in March 2008 on board the Materials International Space Station Experiment (MISSE-6) payload, was exposed for similar to 18 months on the exterior of the International Space Station (ISS) and was retrieved in September 2009. A total of 165 samples was mounted on three separate SUSpECS panels on the ram and wake sides on the ISS. Some samples, particularly those exposed to atomic oxygen in the ram direction, showed pronounced effects due to exposure. Biased samples for the charge-enhanced contamination study showed subtle variations in visible and infrared reflectivity.
C1 [Dennison, J. R.; Evans, Amberly; Fullmer, Danielle] Utah State Univ, Mat Phys Grp, Dept Phys, Logan, UT 84322 USA.
[Hodges, Joshua L.] Hill AFB, Struct Anal Grp T38, Ogden, UT USA.
RP Dennison, JR (reprint author), Utah State Univ, Mat Phys Grp, Dept Phys, Logan, UT 84322 USA.
EM JR.Dennison@usu.edu; amb.eva@aggiemail.usu.edu;
danielle.fullmer@aggiemail.usu.edu; joshua.hodges@hill.af.mil
RI Dennison, John/C-1225-2014;
OI Dennison, JR/0000-0002-5504-3353
FU Utah State University (USU) Space Dynamics Laboratory; NASA through
Johns Hopkins Applied Physics Laboratory; USU; Air Force Office of
Scientific Research
FX Manuscript received April 4, 2011; revised September 30, 2011; accepted
November 17, 2011. Date of publication December 26, 2011; date of
current version February 10, 2012. This work was supported in part by
the Utah State University (USU) Space Dynamics Laboratory, by the NASA
Solar Probe Mission through Johns Hopkins Applied Physics Laboratory,
and by a USU Undergraduate Research and Creative Opportunities grant.;
The authors would like to thank the USU Get-Away-Special
Team-particularly J. Duce and J. Hodges-for their critical role in the
design and construction of SUSpECS. The authors would also like to thank
the Air Force Office of Scientific Research that sponsors the MISSE
program and NASA that provides transportation to and from the ISS aboard
the Space Shuttle. G. Pippin, S. Hahn, and the team at Boeing provided
invaluable support for the project and as did the team at NASA Langley
Research Center who integrated and deintegrated the SUSpECS sample
panels into the MISSE-6 Passive Experiment Containers. We also have
profited from useful discussion with M. R. Carruth, Jr. and T. Schneider
at NASA Marshal Space Flight Center and J. Alred at Boeing about ISS
materials; C. Swenson in the Electrical and Computer Engineering
Department, USU, about FPMU materials; C. Thompson and J. Burns at ATK
Space Systems; and A. R. Frederickson and N. W. Green at the Jet
Propulsion Laboratory about CRRES materials. A. Auman performed the
SimION electric field simulations. S. Barton, J. C. Guthrie, R.
Hoffmann, and J. Abbott of the USU Materials Physics Group helped with
various characterization measurements and sample preparation. J. Dyer at
USU Space Dynamics Laboratory was instrumental in characterization
measurements and sample preparation and assembly. J. Prebola, D. Crider,
and D. Crews with the Aerospace Testing Alliance at Arnold Air Force
Base collaborated on ground test chamber simulations for space
degradation of samples.
NR 45
TC 2
Z9 2
U1 0
U2 3
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD FEB
PY 2012
VL 40
IS 2
SI SI
BP 254
EP 261
DI 10.1109/TPS.2011.2178104
PN 1
PG 8
WC Physics, Fluids & Plasmas
SC Physics
GA 894LS
UT WOS:000300428800015
ER
PT J
AU Hoffmann, R
Dennison, JR
AF Hoffmann, Ryan
Dennison, J. R.
TI Measurement Methods of Electron Emission Over a Full Range of Sample
Charging
SO IEEE TRANSACTIONS ON PLASMA SCIENCE
LA English
DT Article
DE Electron yield; insulator; measurement techniques; spacecraft charging
ID INSULATORS; METALS
AB Spacecraft charging codes require accurate models of electron yields as a function of accumulated charge to correctly predict the charge buildup on spacecraft. The accumulated charge creates equilibrium surface potentials on spacecraft resulting from interactions with the space plasma environment. There is, however, a complex relation between these emission properties and the charge built up in spacecraft insulators. This paper focuses on different methods appropriate to determine the fundamental electronic material property of the total electron yield as the materials accumulate charge. Three methods for determining the uncharged total yield are presented: 1) The dc continuous beam method is a relatively easy and accurate method appropriate for conductors and semiconductors with maximum total electron yield sigma(max) < 2 and resistivity rho < 10(17) Omega . cm; 2) the pulsed-yield method seeks to minimize the effects of charging and is applicable to materials with sigma(max) < 4 and rho up to > 10(24) Omega . cm; and 3) the yield decay method is a very difficult and time-consuming technique that uses a combination of measurement and modeling to investigate the most difficult materials with sigma(max) > 4 and rho up to < 10(24) Omega . cm. Data for high-purity polycrystalline Au, Kapton HN and CP1 polyimides, and polycrystalline aluminum oxide ceramic are presented. These data demonstrate the relative strengths and weaknesses of each method but more importantly show that the methods described herein are capable of reliably measuring the total electron yield of almost any spacecraft material.
C1 [Hoffmann, Ryan] USAF, Res Lab, Albuquerque, NM 87111 USA.
[Dennison, J. R.] Utah State Univ, Dept Phys, Mat Phys Grp, Logan, UT 84322 USA.
RP Hoffmann, R (reprint author), USAF, Res Lab, Albuquerque, NM 87111 USA.
EM ryan.hoffmann@kirtland.af.mil; JR.Dennison@usu.edu
RI Dennison, John/C-1225-2014;
OI Dennison, JR/0000-0002-5504-3353
FU NASA through the Johns Hopkins University Applied Physics Laboratory;
NASA
FX Manuscript received April 4, 2011; revised November 7, 2011; accepted
November 17, 2011. Date of publication December 29, 2011; date of
current version February 10, 2012. This work was supported in part by
the NASA Solar Probe Mission through the Johns Hopkins University
Applied Physics Laboratory and in part by the NASA Space Environments
and Effects Program.
NR 24
TC 7
Z9 8
U1 0
U2 12
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 0093-3813
J9 IEEE T PLASMA SCI
JI IEEE Trans. Plasma Sci.
PD FEB
PY 2012
VL 40
IS 2
SI SI
BP 298
EP 304
DI 10.1109/TPS.2011.2178251
PN 1
PG 7
WC Physics, Fluids & Plasmas
SC Physics
GA 894LS
UT WOS:000300428800020
ER
PT J
AU Gregory, OJ
Amani, M
Tougas, IM
Drehman, AJ
AF Gregory, Otto J.
Amani, Matin
Tougas, Ian M.
Drehman, Alvin J.
TI Stability and Microstructure of Indium Tin Oxynitride Thin Films
SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY
LA English
DT Article
ID THERMOCOUPLES; OXIDE; ITO
AB Indium oxide (In2O3) and indium tin oxide (ITO) thin films have been investigated for high temperature thermocouple and strain guage applications. Reactive sputtering in nitrogen-rich plasmas was used to improve the high temperature stability of indium oxide-based films in air and scanning electron microscopy was used to follow the microstructural changes in the nitrogen-processed films. When thermally cycled at temperatures above 800 degrees C, a partially sintered microstructure comprised of nanometer-sized crystallites was revealed. A densified layer was also formed on the surface, which acted as an oxygen-diffusion barrier in the bulk film. This combined with a network of partially sintered oxynitride crystallites lead to considerable open porosity and a stabilizing effect on the ensuing electrical properties. In this article, the thermoelectric properties of nitrogen-processed films were evaluated at temperatures up to 1400 degrees C. To study the effect of nitrogen plasma processing on the sintering kinetics and associated densification, the constrained sintering of the resulting films was followed as a function of time and temperature. Based on the measured thermoelectric properties of the nitrogen processed films, drift rates on the same order of magnitude as commercial type K wire thermocouples were realized for these all-ceramic thermocouples.
C1 [Gregory, Otto J.; Amani, Matin; Tougas, Ian M.] Univ Rhode Isl, Dept Chem Engn, Kingston, RI 02881 USA.
[Drehman, Alvin J.] USAF, Res Lab, Bedford, MA 01731 USA.
RP Gregory, OJ (reprint author), Univ Rhode Isl, Dept Chem Engn, Kingston, RI 02881 USA.
EM gregory@egr.uri.edu
FU NASA Glen Research Center, Cleveland, Ohio under NASA [NNX07AB83A]
FX The authors wish to thank the NASA Glen Research Center, Cleveland, Ohio
for the support of this work under NASA Grant NNX07AB83A (Aircraft
Ageing and Durability Project).
NR 22
TC 13
Z9 15
U1 5
U2 52
PU WILEY-BLACKWELL
PI HOBOKEN
PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA
SN 0002-7820
J9 J AM CERAM SOC
JI J. Am. Ceram. Soc.
PD FEB
PY 2012
VL 95
IS 2
BP 705
EP 710
DI 10.1111/j.1551-2916.2011.04845.x
PG 6
WC Materials Science, Ceramics
SC Materials Science
GA 884UA
UT WOS:000299733100043
ER
PT J
AU Gehl, M
Gibson, R
Hendrickson, J
Homyk, A
Saynatjoki, A
Alasaarela, T
Karvonen, L
Tervonen, A
Honkanen, S
Zandbergen, S
Richards, BC
Olitzky, JD
Scherer, A
Khitrova, G
Gibbs, HM
Kim, JY
Lee, YH
AF Gehl, Michael
Gibson, Ricky
Hendrickson, Joshua
Homyk, Andrew
Saynatjoki, Antti
Alasaarela, Tapani
Karvonen, Lasse
Tervonen, Ari
Honkanen, Seppo
Zandbergen, Sander
Richards, Benjamin C.
Olitzky, J. D.
Scherer, Axel
Khitrova, Galina
Gibbs, Hyatt M.
Kim, Ju-Young
Lee, Yong-Hee
TI Effect of atomic layer deposition on the quality factor of silicon
nanobeam cavities
SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
LA English
DT Article
ID CURVED-MICROFIBER
AB In this work we study the effect of thin-film deposition on the quality factor (Q) of silicon nanobeam cavities. We observe an average increase in the Q of 38 +/- 31% in one sample and investigate the dependence of this increase on the initial nanobeam hole sizes. We note that this process can be used to modify cavities that have larger than optimal hole sizes following fabrication. Additionally, the technique allows the tuning of the cavity mode wavelength and the incorporation of new materials, without significantly degrading Q. (C) 2012 Optical Society of America
C1 [Gehl, Michael; Gibson, Ricky; Zandbergen, Sander; Olitzky, J. D.; Khitrova, Galina; Gibbs, Hyatt M.] Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA.
[Hendrickson, Joshua] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Homyk, Andrew; Scherer, Axel] CALTECH, Kavli Nanosci Inst, Pasadena, CA 91125 USA.
[Saynatjoki, Antti; Alasaarela, Tapani; Karvonen, Lasse; Tervonen, Ari; Honkanen, Seppo] Aalto Univ, Sch Elect Engn, Dept Micro & Nanosci, Aalto 00076, Finland.
[Richards, Benjamin C.] EMCORE Corp, Adv Concepts Team, Albuquerque, NM 87123 USA.
[Kim, Ju-Young; Lee, Yong-Hee] Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea.
RP Gehl, M (reprint author), Univ Arizona, Coll Opt Sci, 1630 E Univ Blvd, Tucson, AZ 85721 USA.
EM mgehl@optics.arizona.edu
RI Lee, Yong Hee/C-2015-2011; Saynatjoki, Antti/M-1355-2015
OI Saynatjoki, Antti/0000-0002-9354-3623
FU Department of Defense (DoD) through the National Defense Science
Engineering; Arizona Technology & Research Initiative; Air Force Office
of Scientific Research (AFOSR)-LRIR [10RY04COR]; ARCS Foundation;
Academy of Finland [134087]; Finnish Foundation for Technology
Promotion; NSF ERC CIAN [EEC-0812072]; AFOSR [FA9550-10- 1-0003]; NSF
EPMD [ECCS-1101341]
FX M. Gehl acknowledges support by the Department of Defense (DoD) through
the National Defense Science & Engineering Graduate Fellowship (NDSEG)
program. S. Zandbergen acknowledges partial support from Arizona
Technology & Research Initiative Funding (TRIF). J. Hendrickson
acknowledges support from the Air Force Office of Scientific Research
(AFOSR)-LRIR 10RY04COR (Gernot Pomrenke, program manager). A. Homyk
appreciates the generous support of the ARCS Foundation. A. Saynatjoki
was supported by Academy of Finland grant 134087 and a travel grant by
the Finnish Foundation for Technology Promotion. The Caltech and UofA
groups thank NSF ERC CIAN (EEC-0812072) for support. The UofA group
acknowledges support from the AFOSR (FA9550-10- 1-0003) and NSF EPMD
(ECCS-1101341).
NR 19
TC 8
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U1 0
U2 0
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 0740-3224
J9 J OPT SOC AM B
JI J. Opt. Soc. Am. B-Opt. Phys.
PD FEB
PY 2012
VL 29
IS 2
BP A55
EP A59
PG 5
WC Optics
SC Optics
GA 894DN
UT WOS:000300407300009
ER
PT J
AU Hendrickson, J
Guo, JP
Zhang, BY
Buchwald, W
Soref, R
AF Hendrickson, Joshua
Guo, Junpeng
Zhang, Boyang
Buchwald, Walter
Soref, Richard
TI Wideband perfect light absorber at midwave infrared using multiplexed
metal structures
SO OPTICS LETTERS
LA English
DT Article
ID VISIBLE FREQUENCIES; TOTAL ABSORPTION; ANOMALIES; GRATINGS; FILMS
AB We experimentally demonstrate a wideband near-perfect light absorber in the midwave IR region using a multiplexed plasmonic metal structure. The wideband near-perfect light absorber is made of two different size gold metal squares multiplexed on a thin dielectric spacing layer on top of a thick metal layer in each unit cell. We also fabricate regular nonmultiplexed structure perfect light absorbers. The multiplexed structure IR absorber absorbs more than 98% of the incident light over a much wider spectral band than regular nonmultiplexed structure perfect light absorbers in the midwave IR region. (C) 2012 Optical Society of America
C1 [Hendrickson, Joshua] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Guo, Junpeng; Zhang, Boyang] Univ Alabama, Dept Elect & Comp Engn, Huntsville, AL 35899 USA.
[Buchwald, Walter] Solid State Sci Corp, Nashua, NH 03060 USA.
[Soref, Richard] Univ Massachusetts, Dept Phys, Boston, MA 02125 USA.
[Soref, Richard] Univ Massachusetts, Engn Program, Boston, MA 02125 USA.
RP Guo, JP (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM guoj@uah.edu
FU ASEE-Air Force Office of Scientific Research (AFOSR); Air Force Office
of Scientific Research (AFOSR) [LRIR 10RY04COR]; National Science
Foundation (NSF) [0814103]; National Aeronautics and Space
Administration (NASA) [NNX07 AL52A]
FX Junpeng Guo acknowledges the support from the ASEE-Air Force Office of
Scientific Research (AFOSR) Summer Faculty Fellowship Program. Joshua
Hendrickson acknowledges support from the Air Force Office of Scientific
Research (AFOSR) through the program LRIR 10RY04COR. This work was also
partially supported by the National Science Foundation (NSF) through the
award NSF no. 0814103 and the National Aeronautics and Space
Administration (NASA) through grant no. NNX07 AL52A.
NR 19
TC 105
Z9 106
U1 5
U2 55
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 0146-9592
J9 OPT LETT
JI Opt. Lett.
PD FEB 1
PY 2012
VL 37
IS 3
BP 371
EP 373
PG 3
WC Optics
SC Optics
GA 894DQ
UT WOS:000300407600030
PM 22297356
ER
PT J
AU Nikolic, M
Popovic, S
Upadhyay, J
Vuskovic, L
Leiweke, R
Ganguly, B
AF Nikolic, M.
Popovic, S.
Upadhyay, J.
Vuskovic, L.
Leiweke, R.
Ganguly, B.
TI On a dielectric-barrier and a microwave-cavity discharge in synchronized
operation-the case of a helium/oxygen mixture
SO PLASMA SOURCES SCIENCE & TECHNOLOGY
LA English
DT Article
ID SINGLET-DELTA-OXYGEN; A-BAND; PRESSURE; HELIUM; PLASMA; SPECTROSCOPY;
TEMPERATURE; EXCITATION; AFTERGLOW
AB We have investigated the performance of a microwave-cavity discharge (MWD) operating in tandem with a fast rise-time pulsed dielectric-barrier discharge (DBD). The tandem discharge operated in a helium/oxygen mixture, where metastable molecular oxygen could be produced efficiently using MWD in proportionally large quantities (order of 20% of total oxygen number density). In this new arrangement, a DBD operating at high E/N provided a metastables-rich mixture, thereby modifying the discharge kinetics of the MWD, which operated in the E/N range centered around 10 Td. Both discharges operated in synchronized pulse-repetitive mode, which was tailored to maximize the oxygen metastable production efficiency. The system operated at pressures up to 350 Torr with an average power between 3 and 20 W.
C1 [Nikolic, M.; Popovic, S.; Upadhyay, J.; Vuskovic, L.] Old Dominion Univ, Dept Phys, Ctr Accelerator Sci, Norfolk, VA 23529 USA.
[Leiweke, R.; Ganguly, B.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Nikolic, M (reprint author), Old Dominion Univ, Dept Phys, Ctr Accelerator Sci, Norfolk, VA 23529 USA.
EM mniko004@odu.edu
NR 22
TC 2
Z9 2
U1 2
U2 6
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0963-0252
J9 PLASMA SOURCES SCI T
JI Plasma Sources Sci. Technol.
PD FEB
PY 2012
VL 21
IS 1
AR 015004
DI 10.1088/0963-0252/21/1/015004
PG 8
WC Physics, Fluids & Plasmas
SC Physics
GA 893XL
UT WOS:000300390900005
ER
PT J
AU Shanks, GD
Brundage, JF
AF Shanks, G. Dennis
Brundage, John F.
TI Pathogenic Responses among Young Adults during the 1918 Influenza
Pandemic
SO EMERGING INFECTIOUS DISEASES
LA English
DT Article
ID BACTERIAL PNEUMONIA; VIRUS; MORTALITY; PREPAREDNESS; PROTECTION;
DISEASE; DEATHS; HOST; ARMY; PIGS
AB Of the unexplained characteristics of the 1918-19 influenza pandemic, the extreme mortality rate among young adults (W-shaped mortality curve) is the foremost. Lack of a coherent explanation of this and other epidemiologic and clinical manifestations of the pandemic contributes to uncertainty in preparing for future pandemics. Contemporaneous records suggest that immunopathologic responses were a critical determinant of the high mortality rate among young adults and other high-risk subgroups. Historical records and findings from laboratory animal studies suggest that persons who were exposed to influenza once before 1918 (e.g., A/H3Nx 1890 pandemic strain) were likely to have dysregulated, pathologic cellular immune responses to infections with the A/H1N1 1918 pandemic strain. The immunopathologic effects transiently increased susceptibility to ultimately lethal secondary bacterial pneumonia. The extreme mortality rate associated with the 1918-19 pandemic is unlikely to recur naturally. However, T-cell-mediated immunopathologic effects should be carefully monitored in developing and using universal influenza vaccines.
C1 [Shanks, G. Dennis] Australian Army Malaria Res Inst, Enoggera, Qld, Australia.
[Brundage, John F.] USAF, Hlth Surveillance Ctr, Silver Spring, MD USA.
RP Shanks, GD (reprint author), Australian Army Malaria Inst, Enoggera, Qld 4051, Australia.
EM dennis.shanks@defence.gov.au
RI Shanks, George Dennis/F-4056-2014
OI Shanks, George Dennis/0000-0001-5763-8660
NR 40
TC 30
Z9 30
U1 1
U2 6
PU CENTERS DISEASE CONTROL
PI ATLANTA
PA 1600 CLIFTON RD, ATLANTA, GA 30333 USA
SN 1080-6040
J9 EMERG INFECT DIS
JI Emerg. Infect. Dis
PD FEB
PY 2012
VL 18
IS 2
BP 201
EP 207
DI 10.3201/eid1802.102042
PG 7
WC Immunology; Infectious Diseases
SC Immunology; Infectious Diseases
GA 889MU
UT WOS:000300078600001
PM 22306191
ER
PT J
AU McGuire, SA
Marsh, RW
Sowin, TW
Robinson, AY
AF McGuire, Stephen A.
Marsh, Royden W.
Sowin, Timothy W.
Robinson, Andrew Y.
TI Aeromedical Decision Making and Seizure Risk After Traumatic Brain
Injury: Longitudinal Outcome
SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE
LA English
DT Article
DE post-traumatic seizure markers; aeromedical waiver; neurocognitive
impairment; neurologic deficit; sudden incapacitation
ID UNPROVOKED SEIZURES; EPILEPSY
AB MCGUIRE SA, MARSH RW, SOWIN TW, ROBINSON AY. Aeromedical decision making and seizure risk after traumatic brain injury: longitudinal outcome. Aviat Space Environ Med 2012; 83:140-3.
Introduction: Traumatic brain injury (TBI) is common in young adults and therefore of significant concern to an aircrew population. This paper reports the occurrences of seizures in U.S. Air Force (USAF) aircrew following receipt of an aeromedical waiver for TBI. Methods: Using both an aeromedical waiver tracking system database and medical records, we identified surrogate seizure markers such as all episodes of subsequent TBI, seizure, loss of consciousness, or prescription of anticonvulsant medications from the time of initial TBI until the last medical visit or entry recorded in either the database or medical records for our study population. Results: The seizure rate for aircrew who met USAF waiver criteria was 24.53/100,000 person-years. One pilot experienced a major motor seizure 14.9 yr following a severe TBI for an incidence of 308.64/100,000 person-years. Discussion: The USAF waiver process following TBI was sufficiently effective in removing aircrew with elevated risk for seizure following TBI. While our rates of post-traumatic seizure appear to be lower than previously published civilian population rates, direct comparison cannot be made secondary to differences in study design and selection criteria. Further areas of study could involve a more detailed analysis of aircrew neurocognitive status following TBI for subtle changes, crosschecking USAF Safety Center data for changes in accident rates among post-TBI aircrew, and analysis of lost aircrew flying time as a result of TBI and the degree of burden that loss places on the flying mission. Conclusion: Application of these stringent criteria is sufficient to fulfill aeromedical safety standards, but costs remain undetermined.
C1 [McGuire, Stephen A.; Marsh, Royden W.; Sowin, Timothy W.; Robinson, Andrew Y.] USAF, Sch Aerosp Med, Wright Patterson AFB, OH 45433 USA.
RP McGuire, SA (reprint author), 59MDW USAFSAM FECN, 2200 Bergquist Dr,Ste 1,Rm 6B27, Lackland AFB, TX 78236 USA.
EM smcguire@satx.rr.com
NR 11
TC 2
Z9 3
U1 0
U2 0
PU AEROSPACE MEDICAL ASSOC
PI ALEXANDRIA
PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 USA
SN 0095-6562
J9 AVIAT SPACE ENVIR MD
JI Aviat. Space Environ. Med.
PD FEB
PY 2012
VL 83
IS 2
BP 140
EP 143
DI 10.3357/ASEM.3104.2012
PG 4
WC Public, Environmental & Occupational Health; Medicine, General &
Internal; Sport Sciences
SC Public, Environmental & Occupational Health; General & Internal
Medicine; Sport Sciences
GA 880IF
UT WOS:000299400100009
PM 22303594
ER
PT J
AU Molloy, JW
Calcagno, CJ
Williams, CD
Jones, FJ
Torres, DM
Harrison, SA
AF Molloy, Jeffrey W.
Calcagno, Christopher J.
Williams, Christopher D.
Jones, Frances J.
Torres, Dawn M.
Harrison, Stephen A.
TI Association of coffee and caffeine consumption with fatty liver disease,
nonalcoholic steatohepatitis, and degree of hepatic fibrosis
SO HEPATOLOGY
LA English
DT Article
ID TERM-FOLLOW-UP; CIRRHOSIS; COMPONENTS; ENZYMES; PEROXIDATION;
POPULATION; INHIBITION; PREVALENCE; MECHANISMS; CAFESTOL
AB Coffee caffeine consumption (CC) is associated with reduced hepatic fibrosis in patients with chronic liver diseases, such as hepatitis C. The association of CC with nonalcoholic fatty liver disease (NAFLD) has not been established. The aim of this study was to correlate CC with the prevalence and severity of NAFLD. Patients involved in a previously published NAFLD prevalence study, as well as additional NASH patients identified in the Brooke Army Medical Center Hepatology clinic, were queried about their caffeine intake. A validated questionnaire for CC was utilized to assess for a relationship between caffeine and four groups: ultrasound negative (controls), bland steatosis/not-NASH, NASH stage 0-1, and NASH stage 2-4. A total of 306 patients responded to the CC questionnaire. Average milligrams of total caffeine/coffee CC per day in controls, bland steatosis/not-NASH, NASH stage 0-1, and NASH stage 2-4 were 307/228, 229/160, 351/255, and 252/152, respectively. When comparing patients with bland steatosis/not-NASH to those with NASH stage 0-1, there was a significant difference in CC between the two groups (P = 0.005). Additionally, when comparing patients with NASH stage 0-1 to those with NASH stage 2-4, there was a significant difference in coffee CC (P = 0.016). Spearman's rank correlation analysis further supported a negative relationship between coffee CC and hepatic fibrosis (r = -0.215; P = 0.035). Conclusion: Coffee CC is associated with a significant reduction in risk of fibrosis among NASH patients. (Hepatology 2012)
C1 [Calcagno, Christopher J.; Harrison, Stephen A.] Brooke Army Med Ctr, Dept Med, Div Gastroenterol & Hepatol, Ft Sam Houston, TX 78234 USA.
[Molloy, Jeffrey W.; Williams, Christopher D.; Jones, Frances J.; Harrison, Stephen A.] Wilford Hall USAF Med Ctr, Div Gastroenterol & Hepatol, Lackland AFB, TX 78236 USA.
[Torres, Dawn M.] Walter Reed Army Med Ctr, Div Gastroenterol & Hepatol, Bethesda, MD USA.
RP Harrison, SA (reprint author), Brooke Army Med Ctr, Dept Med, Div Gastroenterol & Hepatol, 3551 Roger Brooke Dr, Ft Sam Houston, TX 78234 USA.
EM Stephen.Harrison@amedd.army.mil
NR 32
TC 100
Z9 103
U1 1
U2 22
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0270-9139
J9 HEPATOLOGY
JI Hepatology
PD FEB
PY 2012
VL 55
IS 2
BP 429
EP 436
DI 10.1002/hep.24731
PG 8
WC Gastroenterology & Hepatology
SC Gastroenterology & Hepatology
GA 883KM
UT WOS:000299632900011
PM 21987293
ER
PT J
AU Chen, N
Yan, ZY
Gadouleau, M
Wang, Y
Suter, BW
AF Chen, Ning
Yan, Zhiyuan
Gadouleau, Maximilien
Wang, Ying
Suter, Bruce W.
TI Rank Metric Decoder Architectures for Random Linear Network Coding With
Error Control
SO IEEE TRANSACTIONS ON VERY LARGE SCALE INTEGRATION (VLSI) SYSTEMS
LA English
DT Article
DE Constant-dimension codes (CDCs); decoding; error correction coding;
Gabidulin codes; Galois fields; integrated circuits; Kotter-Kschischang
(KK) codes; network coding; rank metric codes; subspace codes
ID FINITE-FIELDS; CODES; POLYNOMIALS
AB While random linear network coding is a powerful tool for disseminating information in communication networks, it is highly susceptible to errors caused by various sources. Due to error propagation, errors greatly deteriorate the throughput of network coding and seriously undermine both reliability and security of data. Hence, error control for network coding is vital. Recently, constant-dimension codes (CDCs), especially Kotter-Kschischang (KK) codes, have been proposed for error control in random linear network coding. KK codes can also be constructed from Gabidulin codes, an important class of rank metric codes. Rank metric decoders have been recently proposed for both Gabidulin and KK codes, but they have high computational complexities. Furthermore, it is not clear whether such decoders are feasible and suitable for hardware implementations. In this paper, we reduce the complexities of rank metric decoders and propose novel decoder architectures for both codes. The synthesis results of our decoder architectures for Gabidulin and KK codes with limited error-correcting capabilities over small fields show that our architectures not only are affordable, but also achieve high throughput.
C1 [Chen, Ning] SandForce Inc, Saratoga, CA 95070 USA.
[Yan, Zhiyuan] Lehigh Univ, Dept Elect & Comp Engn, Bethlehem, PA 18015 USA.
[Gadouleau, Maximilien] Univ London, Dept Comp Sci, London E1 4NS, England.
[Wang, Ying] QUALCOMM Inc, New Jersey Res Ctr, Bridgewater, NJ 08807 USA.
[Suter, Bruce W.] USAF, Res Lab, Rome, NY 13441 USA.
RP Chen, N (reprint author), SandForce Inc, Saratoga, CA 95070 USA.
EM nchen@sandforce.com; yan@lehigh.edu; mgadouleau@eecs.qmul.ac.uk;
aywang11@gmail.com; bruce.suter@rl.af.mil
FU Thales Communications, Inc.; Air Force Research Lab; National Science
Foundation [ECCS-0925890]
FX This work was supported in part by Thales Communications, Inc., a summer
extension grant from Air Force Research Lab, and the National Science
Foundation under Grant ECCS-0925890. This paper was presented in part at
the IEEE Workshop on Signal Processing Systems, Tampere, Finland,
October2009.
NR 33
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U1 0
U2 2
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1063-8210
J9 IEEE T VLSI SYST
JI IEEE Trans. Very Large Scale Integr. (VLSI) Syst.
PD FEB
PY 2012
VL 20
IS 2
BP 296
EP 309
DI 10.1109/TVLSI.2010.2096239
PG 14
WC Computer Science, Hardware & Architecture; Engineering, Electrical &
Electronic
SC Computer Science; Engineering
GA 884OS
UT WOS:000299718000009
ER
PT J
AU Roche, KT
Rivera, DE
Cochran, JK
AF Roche, Kevin T.
Rivera, Daniel E.
Cochran, Jeffery K.
TI A control engineering framework for managing whole hospital occupancy
SO MATHEMATICAL AND COMPUTER MODELLING
LA English
DT Article
DE Hospitals; Dynamic modeling; Control; Decision policies
ID SUPPLY CHAIN MANAGEMENT; EMERGENCY-DEPARTMENT; PREDICTIVE CONTROL;
HEALTH-CARE; DEMAND; SYSTEM; MODEL; OPTIMIZATION; METHODOLOGY
AB As factors such as population growth, nation-wide closure of hospitals, and an aging population combine to strain the healthcare system of the United States (US), the demand for better resource and capacity planning increases. This paper proposes a five-step methodology to model and control whole hospital occupancy. The hospital system is viewed using a continuous-time, fluid tank analogy. The system is subsequently discretized and a framework using control theory and Model Predictive Control (MPC) is developed to assist in tactical decision making, while maintaining occupancy targets. The result is a customizable modeling approach that represents interactions between different hospital areas, and interactions between the hospital and the outside world, or the population seeking hospital services. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Roche, Kevin T.] Banner Hlth Corp, Phoenix, AZ 85006 USA.
[Rivera, Daniel E.] Arizona State Univ, Ira A Fulton Sch Engn, Control Syst Engn Lab, Sch Engn Matter Transport & Energy, Tempe, AZ 85287 USA.
[Cochran, Jeffery K.] USAF, Inst Technol, Dept Operat Sci, Wright Patterson AFB, OH 45433 USA.
RP Roche, KT (reprint author), Banner Hlth Corp, Phoenix, AZ 85006 USA.
EM Kevin.Roche@bannerhealth.com; Daniel.Rivera@asu.edu;
Jeffery.cochran@afit.edu
RI 李, 涵/B-4995-2012
FU AHRQ [HS015921-01]; Banner Health
FX We wish to thank leadership at Banner Health for their support and
interest, to all of Management Engineering, James Broyles of the Health
and Human Systems Laboratory at ASU, and Jay Schwartz of the Control
Systems Engineering Laboratory at ASU. This work was funded by AHRQ
under Partnership in Patient Safety grant #HS015921-01 whose PI is Twila
Burdick of Banner Health.
NR 35
TC 1
Z9 1
U1 0
U2 5
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0895-7177
J9 MATH COMPUT MODEL
JI Math. Comput. Model.
PD FEB
PY 2012
VL 55
IS 3-4
BP 1401
EP 1417
DI 10.1016/j.mcm.2011.10.018
PG 17
WC Computer Science, Interdisciplinary Applications; Computer Science,
Software Engineering; Mathematics, Applied
SC Computer Science; Mathematics
GA 870HN
UT WOS:000298660000099
ER
PT J
AU Toussaint, WA
Henney, CJ
Harvey, JW
AF Toussaint, W. A.
Henney, C. J.
Harvey, J. W.
TI Stokes Profile Compression Applied to VSM Data
SO SOLAR PHYSICS
LA English
DT Article
DE Instrumentation and data management; Magnetic fields, photosphere;
Polarization, optical; Spectral line, intensity and diagnostics
ID INVERSION; SOLIS
AB The practical details of applying the Expansion in Hermite Functions (EHF) method to compression of full-disk full-Stokes solar spectroscopic data from the SOLIS/VSM instrument are discussed in this paper. The algorithm developed and discussed here preserves the 630.15 and 630.25 nm Fe i lines, along with the local continuum and telluric lines. This compression greatly reduces the amount of space required to store these data sets while maintaining the quality of the data, allowing these observations to be archived and made publicly available with limited bandwidth. Applying EHF to the full-Stokes profiles and saving the coefficient files with Rice compression reduces the disk space required to store these observations by a factor of 20, while maintaining the quality of the data and with a total compression time only 35% slower than the standard gzip (GNU zip) compression.
C1 [Toussaint, W. A.; Harvey, J. W.] Natl Opt Astron Observ, Natl Solar Observ, Tucson, AZ 85726 USA.
[Henney, C. J.] USAF, Res Lab, Kirtland AFB, Albuquerque, NM USA.
RP Toussaint, WA (reprint author), Natl Opt Astron Observ, Natl Solar Observ, Tucson, AZ 85726 USA.
EM alext@noao.edu; jharvey@noao.edu
FU NASA [NNH09AM111]
FX We are grateful to Christoph Keller (Sterrenkundig Instituut, Utrecht
University) for his suggestion to test the practicality of using the
Expansion in Hermite Functions method with VSM data. The National Solar
Observatory (NSO) data used for this work are produced cooperatively by
National Science Foundation (NSF) and the NSO. The NSO is operated by
the Association of Universities for Research in Astronomy (AURA), Inc.,
under cooperative agreement with the NSF. This work was supported by
NASA grant NNH09AM111.
NR 15
TC 2
Z9 2
U1 0
U2 1
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0038-0938
J9 SOL PHYS
JI Sol. Phys.
PD FEB
PY 2012
VL 276
IS 1-2
BP 415
EP 422
DI 10.1007/s11207-011-9892-5
PG 8
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 878YX
UT WOS:000299295100025
ER
PT J
AU Wellems, LD
Huang, DH
AF Wellems, L. David
Huang, Danhong
TI Near-field light focusing by a slit array in a planar metal film with
nonuniform slit dielectric material
SO AMERICAN JOURNAL OF PHYSICS
LA English
DT Article
ID ELECTROMAGNETIC-WAVE; DIFFRACTION-LIMIT; TRANSMISSION; MICROSCOPY;
SUPERLENS; LENSES
AB We study the interference of evanescent electromagnetic waves generated from multi-slits in a metal film and demonstrate the anomalous bending of light at infrared frequencies due to negative refraction. We also calculate the diffraction of an incident plane electromagnetic waves by a metallic film with an arbitrary linear array of slits, slit separation, and slit dielectric material. In contrast to a double-convex shaped quartz lens, we show that a planar metallic film with a one-dimensional slit array can also focus polarized light in the near-field region when either the slit width or the slit dielectric material becomes spatially nonuniform. (C) 2012 American Association of Physics Teachers.
C1 [Wellems, L. David; Huang, Danhong] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Wellems, LD (reprint author), USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
EM danhong.huang@kirtland.af.mil
FU Air Force Office of Scientific Research
FX The authors would like to thank the Air Force Office of Scientific
Research for its support. They would also like to thank Dr. Dave
Cardimona for his critical reading of this manuscript.
NR 32
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Z9 3
U1 0
U2 2
PU AMER ASSOC PHYSICS TEACHERS AMER INST PHYSICS
PI MELVILLE
PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA
SN 0002-9505
J9 AM J PHYS
JI Am. J. Phys.
PD FEB
PY 2012
VL 80
IS 2
BP 122
EP 132
DI 10.1119/1.3652700
PG 11
WC Education, Scientific Disciplines; Physics, Multidisciplinary
SC Education & Educational Research; Physics
GA 880DY
UT WOS:000299386200004
ER
PT J
AU Cobb, WE
Laspe, ED
Baldwin, RO
Temple, MA
Kim, YC
AF Cobb, William E.
Laspe, Eric D.
Baldwin, Rusty O.
Temple, Michael A.
Kim, Yong C.
TI Intrinsic Physical-Layer Authentication of Integrated Circuits
SO IEEE TRANSACTIONS ON INFORMATION FORENSICS AND SECURITY
LA English
DT Article
DE Access control; authentication; authorization; cryptography; fingerprint
recognition; radio-frequency identification; security
AB Radio-frequency distinct native attribute (RF-DNA) fingerprinting is adapted as a physical-layer technique to improve the security of integrated circuit (IC)-based multifactor authentication systems. Device recognition tasks (both identification and verification) are accomplished by passively monitoring and exploiting the intrinsic features of an IC's unintentional RF emissions without requiring any modification to the device being analyzed. Device discrimination is achieved using RF-DNA fingerprints comprised of higher order statistical features based on instantaneous amplitude, phase, and frequency responses as a device executes a sequence of operations. The recognition system is trained using multiple discriminant analysis to reduce data dimensionality while retaining class separability, and the resultant fingerprints are classified using a linear Bayesian classifier. Demonstrated identification and verification performance includes average identification accuracy of greater than 99.5% and equal error rates of less than 0.05% for 40 near-identical devices. Depending on the level of required classification accuracy, RF-DNA fingerprint-based authentication is well-suited for implementation as a countermeasure to device cloning, and is promising for use in a wide variety of related security problems.
C1 [Cobb, William E.; Laspe, Eric D.; Baldwin, Rusty O.; Temple, Michael A.; Kim, Yong C.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
RP Cobb, WE (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
EM Rusty.Baldwin@afit.edu
FU Tactical SIGINT Technology (TST) Program Office
FX Manuscript received December 15, 2010; revised April 20, 2011; accepted
June 01, 2011. Date of publication June 20, 2011; date of current
version January 13, 2012. This work was supported by the Tactical SIGINT
Technology (TST) Program Office. The views expressed in this paper are
those of the author(s) and do not reflect official policy of the United
States Air Force, Department of Defense, or the U.S. Government. The
associate editor coordinating the review of this manuscript and
approving it for publication was Dr. Kouichi Itoh.
NR 26
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Z9 20
U1 2
U2 14
PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
PI PISCATAWAY
PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
SN 1556-6013
J9 IEEE T INF FOREN SEC
JI IEEE Trans. Inf. Forensic Secur.
PD FEB
PY 2012
VL 7
IS 1
SI SI
BP 14
EP 24
DI 10.1109/TIFS.2011.2160170
PN 1
PG 11
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA 880WA
UT WOS:000299438100003
ER
PT J
AU Hoopes, DJ
Kaziska, D
Chapin, P
Weed, D
Smith, BD
Hale, ER
Johnstone, PA
AF Hoopes, David J.
Kaziska, David
Chapin, Patrick
Weed, Daniel
Smith, Benjamin D.
Hale, E. Ronald
Johnstone, Peter A.
TI PATIENT PREFERENCES AND PHYSICIAN PRACTICE PATTERNS REGARDING BREAST
RADIOTHERAPY
SO INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS
LA English
DT Article
DE Patient preference; Partial breast irradiation; Hypofractionation;
Practice patterns; Breast cancer
ID RANDOMIZED-TRIAL; CONSERVING SURGERY; UK STANDARDIZATION; CANCER;
IRRADIATION; HYPOFRACTIONATION; LUMPECTOMY; MASTECTOMY; WOMEN
AB Purpose: There are multiple current strategies for breast radiotherapy (RT). The alignment of physician practice patterns with best evidence and patient preferences will enhance patient autonomy and improve cancer care. However, there is little information describing patient preferences for breast RT and physician practice patterns.
Methods and Materials: Using a reliable and valid instrument, we assessed the preferences of 5,000 randomly selected women (with or without cancer) undergoing mammography. To assess practice patterns, 2,150 randomly selected physician-members of American Society for Radiation Oncology were surveyed.
Results: A total of 1,807 women (36%) and 363 physicians (17%) provided usable responses. The 95% confidence interval is < +/- 2.3% for patients and < +/- 5.3% for physicians. Patient preferences were hypofractionated whole breast irradiation (HF-WBI) 62%, partial breast irradiation (PBI) 28%, and conventionally fractionated whole breast irradiation (CF-WBI) 10%. By comparison, 82% of physicians use CF-WBI for more than 2/3 of women and 56% never use HF-WBI. With respect to PBI, 62% of women preferred three-dimensional (3D)-PBI and 38% favor brachytherapy-PBI, whereas 36% of physicians offer 3D-PBI and 66% offer brachytherapy-PBI. 70% of women prefer once-daily RT over 10 days vs. twice-daily RT over 5 days. 55% of physicians who use PBI do not offer PBI on clinical trial.
Conclusions: HF-WBI, while preferred by patients and supported by evidence, falls behind the unproven and less preferred strategy of PBI in clinical practice. There is a discrepancy between women's preferences for PBI modality and type of PBI offered by physicians. Further alignment is needed between practice patterns, patient preferences, and clinical evidence. (C) 2012 Elsevier Inc.
C1 [Hoopes, David J.] Uniformed Serv Univ Hlth Sci, Dept Radiol & Radiol Sci, Wright Patterson AFB, OH USA.
[Kaziska, David; Chapin, Patrick] USAF, Inst Technol, Wright Patterson AFB, OH USA.
[Johnstone, Peter A.] Indiana Univ Sch Med, Dept Radiat Oncol, Indianapolis, IN USA.
[Weed, Daniel] Methodist Hosp, Dept Radiat Oncol, Indianapolis, IN USA.
[Smith, Benjamin D.] Univ Texas MD Anderson Canc Ctr, Dept Radiat Oncol, Houston, TX 77030 USA.
[Hale, E. Ronald] Wright Patterson Med Ctr, Dept Radiat Oncol, Wright Patterson AFB, OH USA.
RP Hoopes, DJ (reprint author), Dept Radiat Oncol, 88 MDOS SGOMR,4881 Sugar Maple Dr, Wright Patterson AFB, OH 45433 USA.
EM david.hoopes@wpafb.af.mil
OI Smith, Benjamin/0000-0001-7866-1093
FU Directorate for Modernization, Office of the Air Force Surgeon General
FX This project was supported by funds from the Directorate for
Modernization, Office of the Air Force Surgeon General.
NR 22
TC 14
Z9 14
U1 0
U2 4
PU ELSEVIER SCIENCE INC
PI NEW YORK
PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA
SN 0360-3016
J9 INT J RADIAT ONCOL
JI Int. J. Radiat. Oncol. Biol. Phys.
PD FEB 1
PY 2012
VL 82
IS 2
BP 674
EP 681
DI 10.1016/j.ijrobp.2010.11.077
PG 8
WC Oncology; Radiology, Nuclear Medicine & Medical Imaging
SC Oncology; Radiology, Nuclear Medicine & Medical Imaging
GA 878FC
UT WOS:000299239900035
PM 21277106
ER
PT J
AU Haverhals, LM
Sulpizio, HM
Fayos, ZA
Trulove, MA
Reichert, WM
Foley, MP
De Long, HC
Trulove, PC
AF Haverhals, Luke M.
Sulpizio, Hadley M.
Fayos, Zane A.
Trulove, Matthew A.
Reichert, W. Matthew
Foley, Matthew P.
De Long, Hugh C.
Trulove, Paul C.
TI Process variables that control natural fiber welding: time, temperature,
and amount of ionic liquid
SO CELLULOSE
LA English
DT Article
DE Cellulose dissolution; Cellulose fiber; Composite; Ionic liquid; Partial
dissolution
ID ALL-CELLULOSE COMPOSITES; X-RAY-DIFFRACTION; SURFACE SELECTIVE
DISSOLUTION; MICROCRYSTALLINE CELLULOSE; STRUCTURAL-CHANGES; IR
AB A systematic study of variables that affect the fiber welding process is presented. Cotton cloth samples are treated with controlled amounts of 1-ethyl-3-methylimidazolium acetate for a series of times and temperatures. Diluting the ionic liquid with a volatile molecular co-solvent allows temporal and spatial control of the welding process not possible with neat ionic liquids. Materials are characterized by scanning electron microscopy, infrared spectroscopy, X-ray diffraction, and mechanical (tensile) testing. Results suggest careful management of process variables permits controlled, reproducible manipulation of chemical and physical properties.
C1 [Haverhals, Luke M.; Sulpizio, Hadley M.; Fayos, Zane A.; Trulove, Matthew A.; Reichert, W. Matthew; Foley, Matthew P.; Trulove, Paul C.] USN Acad, Dept Chem, Annapolis, MD 21402 USA.
[De Long, Hugh C.] USAF, Off Sci Res, Arlington, VA 22203 USA.
RP Trulove, PC (reprint author), USN Acad, Dept Chem, Annapolis, MD 21402 USA.
EM trulove@usna.edu
FU US Air Force Office of Scientific Research; US Naval Academy
FX We are grateful to the US Air Force Office of Scientific Research and US
Naval Academy for funding portions of this work. Any opinions, findings
and conclusions or recommendations expressed in this material are those
of the authors and do not necessarily reflect the views of the US Air
Force or the US Navy.
NR 40
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Z9 11
U1 4
U2 22
PU SPRINGER
PI DORDRECHT
PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS
SN 0969-0239
J9 CELLULOSE
JI Cellulose
PD FEB
PY 2012
VL 19
IS 1
BP 13
EP 22
DI 10.1007/s10570-011-9605-0
PG 10
WC Materials Science, Paper & Wood; Materials Science, Textiles; Polymer
Science
SC Materials Science; Polymer Science
GA 874YN
UT WOS:000298994600002
ER
PT J
AU Funke, GJ
Knott, BA
Salas, E
Pavlas, D
Strang, AJ
AF Funke, Gregory J.
Knott, Benjamin A.
Salas, Eduardo
Pavlas, Davin
Strang, Adam J.
TI Conceptualization and Measurement of Team Workload: A Critical Need
SO HUMAN FACTORS
LA English
DT Article
DE team workload; measurement; subjective measures; performance measures;
physiological measures; strategy shift measures
ID PHYSIOLOGICAL COMPLIANCE; MENTAL MODELS; PERFORMANCE; COORDINATION;
COMPLEX; AGGREGATION; DESIGN; ISSUES
AB Objective: The purpose of this article is to present and expand on current theories and measurement techniques for assessing team workload.
Background: To date, little research has been conducted on the workload experienced by teams. A validated theory describing team workload, which includes an account of its relation to individual workload, has not been articulated.
Method: The authors review several theoretical approaches to team workload. Within the team research literature, attempts to evaluate team workload have typically relied on measures of individual workload. This assumes that such measures retain their validity at the team level of measurement, but empirical research suggests that this method may lack sensitivity to the drivers of team workload.
Results: On the basis of these reviews, the authors advance suggestions concerning a comprehensive theory of team workload and methods for assessing it in team settings. The approaches reviewed include subjective, performance, physiological, and strategy shift measures. Theoretical and statistical difficulties associated with aggregating individual-level workload responses to a team-level measure are discussed.
Conclusion: Conception and measurement of team workload have not significantly matured alongside developments in individual workload.
Application: Team workload remains a complex research area without simple measurement solutions, but as a research domain it remains open for contributions from interested and enterprising researchers.
C1 [Funke, Gregory J.; Knott, Benjamin A.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Salas, Eduardo] Univ Cent Florida, Human Syst Integrat Res Dept, Inst Simulat & Training, Orlando, FL 32816 USA.
[Pavlas, Davin] Univ Cent Florida, Appl Expt & Human Factors Psychol Doctoral Progra, Orlando, FL 32816 USA.
[Strang, Adam J.] Consortium Res Fellows Program, Alexandria, VA USA.
RP Funke, GJ (reprint author), USAF, Res Lab, 2510 5th St, Wright Patterson AFB, OH 45433 USA.
EM Gregory.Funke@wpafb.af.mil
NR 89
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Z9 17
U1 4
U2 21
PU SAGE PUBLICATIONS INC
PI THOUSAND OAKS
PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA
SN 0018-7208
EI 1547-8181
J9 HUM FACTORS
JI Hum. Factors
PD FEB
PY 2012
VL 54
IS 1
BP 36
EP 51
DI 10.1177/0018720811427901
PG 16
WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology,
Applied; Psychology
SC Behavioral Sciences; Engineering; Psychology
GA 878YB
UT WOS:000299292200004
PM 22409101
ER
PT J
AU Lyons, JB
Stokes, CK
AF Lyons, Joseph B.
Stokes, Charlene K.
TI Human-Human Reliance in the Context of Automation
SO HUMAN FACTORS
LA English
DT Article
DE human-human reliance; trust in automation; vulnerability; risk
perceptions
ID DECISION-MAKING; TRUST; PERFORMANCE; TASK; AIDS; TRUSTWORTHINESS;
SYSTEM; TEAMS
AB Objective: The current study examined human-human reliance during a computer-based scenario where participants interacted with a human aid and an automated tool simultaneously.
Background: Reliance on others is complex, and few studies have examined human-human reliance in the context of automation. Past research found that humans are biased in their perceived utility of automated tools such that they view them as more accurate than humans. Prior reviews have postulated differences in human-human versus human-machine reliance, yet few studies have examined such reliance when individuals are presented with divergent information from different sources.
Method: Participants (N = 40) engaged in the Convoy Leader experiment. They selected a convoy route based on explicit guidance from a human aid and information from an automated map. Subjective and behavioral human-human reliance indices were assessed. Perceptions of risk were manipulated by creating three scenarios (low, moderate, and high) that varied in the amount of vulnerability (i.e., potential for attack) associated with the convoy routes.
Results: Results indicated that participants reduced their behavioral reliance on the human aid when faced with higher risk decisions (suggesting increased reliance on the automation); however, there were no reported differences in intentions to rely on the human aid relative to the automation.
Conclusion: The current study demonstrated that when individuals are provided information from both a human aid and automation, their reliance on the human aid decreased during high-risk decisions.
Application: This study adds to a growing understanding of the biases and preferences that exist during complex human-human and human-machine interactions.
C1 [Lyons, Joseph B.] USAF, Off Sci Res, Arlington, VA 22203 USA.
RP Lyons, JB (reprint author), USAF, Off Sci Res, 875 N Randolph St,Suite 325, Arlington, VA 22203 USA.
EM Joseph.lyons@afosr.af.mil
NR 32
TC 7
Z9 7
U1 5
U2 15
PU SAGE PUBLICATIONS INC
PI THOUSAND OAKS
PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA
SN 0018-7208
J9 HUM FACTORS
JI Hum. Factors
PD FEB
PY 2012
VL 54
IS 1
BP 112
EP 121
DI 10.1177/0018720811427034
PG 10
WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology,
Applied; Psychology
SC Behavioral Sciences; Engineering; Psychology
GA 878YB
UT WOS:000299292200009
PM 22409106
ER
PT J
AU Schmidt, JB
Ganguly, BN
AF Schmidt, Jacob B.
Ganguly, Biswa N.
TI Point-to-plane pulsed discharge initiated flame structure modification
in propane-air flame
SO JOURNAL OF PHYSICS D-APPLIED PHYSICS
LA English
DT Article
ID PLASMA-ASSISTED COMBUSTION; IGNITION; METHANE; STABILIZATION; OXIDATION;
MIXTURES; FLOW; JET
AB The effect of a point-to-plane pulsed discharge on a propane/air flame has been investigated by phase-locked simultaneous measurements of the change in gas temperature and OH planar laser-induced-fluorescence (PLIF). Phase-locked simultaneous measurement of gas temperature through spontaneous Raman scattering and OH PLIF with the variation of pulsed plasma energy and plasma generation location with respect to the flame holder and flame reaction zone have been performed. A fast rise time (15 ns) and a slower rise time (150 ns) high voltage pulsers are used to produce OH radical densities 50% greater than the ambient flame produced OH radicals in both lean and rich premixed flames. The excess OH radical densities were found to decay to the 50% level with time constants greater than 100 mu s in the burnt gas regions with gas temperatures greater than 1000 K. The flame perturbation was dependent on the pulse repetition rates as well as on the pulse rise time for similar energy deposition per pulse. A laser photo-deflection measurement of acoustic pressure pulse generation by the pulsed discharge suggests that flame perturbation by the downstream plasma is caused mostly by flow perturbation.
C1 [Schmidt, Jacob B.] Spectral Energies Inc, Dayton, OH 45432 USA.
[Ganguly, Biswa N.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Schmidt, JB (reprint author), Spectral Energies Inc, Dayton, OH 45432 USA.
OI Schmidt, Jacob/0000-0002-9855-6319
NR 20
TC 7
Z9 7
U1 0
U2 6
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0022-3727
J9 J PHYS D APPL PHYS
JI J. Phys. D-Appl. Phys.
PD FEB 1
PY 2012
VL 45
IS 4
AR 045203
DI 10.1088/0022-3727/45/4/045203
PG 9
WC Physics, Applied
SC Physics
GA 879JE
UT WOS:000299324700008
ER
PT J
AU Rolling, AJ
Byerley, AR
Wisniewski, CF
AF Rolling, August J.
Byerley, Aaron R.
Wisniewski, Charles F.
TI Integrating Systems Engineering Into the USAF Academy Capstone Gas
Turbine Engine Course
SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE
ASME
LA English
DT Article
DE Systems Engineering Integration Gas Turbine Engine Design Capstone; USAF
Academy
AB This paper is intended to serve as a template for incorporating technical management majors into a traditional engineering design course. In 2002, the Secretary of the Air Force encouraged the United States Air Force (USAF) Academy to initiate a new interdisciplinary academic major related to systems engineering. This direction was given in an effort to help meet the Air Force's growing need for "systems" minded officers to manage the development and acquisition of its ever more complex weapons systems. The curriculum for the new systems engineering management (SEM) major is related to the "engineering of large, complex systems and the integration of the many subsystems that comprise the larger system" and differs in the level of technical content from the traditional engineering major. The program allows emphasis in specific cadet-selected engineering tracks with additional course work in human systems, operations research, and program management. Specifically, this paper documents how individual SEM majors have been integrated into aeronautical engineering design teams within a senior level capstone course to complete the preliminary design of a gas turbine engine. As the Aeronautical Engineering (AE) cadets performed the detailed engine design, the SEM cadets were responsible for tracking performance, cost, schedule, and technical risk. Internal and external student assessments indicate that this integration has been successful at exposing both the AE majors and the SEM majors to the benefits of "systems thinking" by giving all the opportunity to employ SE tools in the context of a realistic aircraft engine design project. [DOI: 10.1115/1.4004397]
C1 [Rolling, August J.; Byerley, Aaron R.; Wisniewski, Charles F.] USAF Acad, HQ USAFA DFAN, Colorado Springs, CO 80840 USA.
RP Rolling, AJ (reprint author), USAF Acad, HQ USAFA DFAN, 2410 Fac Dr, Colorado Springs, CO 80840 USA.
RI 李, 涵/B-4995-2012
NR 9
TC 0
Z9 0
U1 0
U2 2
PU ASME-AMER SOC MECHANICAL ENG
PI NEW YORK
PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0742-4795
J9 J ENG GAS TURB POWER
JI J. Eng. Gas. Turbines Power-Trans. ASME
PD FEB
PY 2012
VL 134
IS 2
AR 021601
DI 10.1115/1.4004397
PG 8
WC Engineering, Mechanical
SC Engineering
GA 868RB
UT WOS:000298540500005
ER
PT J
AU Wertz, J
Shen, MHH
Scott-Emuakpor, O
George, T
Cross, C
AF Wertz, John
Shen, M. -H. Herman
Scott-Emuakpor, Onome
George, Tommy
Cross, Charles
TI An Energy-Based Axial Isothermal-Mechanical Fatigue Lifing Procedure
SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE
ASME
LA English
DT Article
AB An energy-based fatigue lifing procedure for the determination of full-life and critical-life of in-service structures subjected to axial isothermal-mechanical fatigue (IMF) has been developed. The foundation of this procedure is the energy-based axial room-temperature fatigue model, which states: the total strain energy density accumulated during both a monotonic fracture event and a fatigue process is the same material property. The energy-based axial IMF lifing framework is composed of the following entities: (1) the development of an axial IMF testing capability; (2) the creation of a testing procedure capable of assessing the strain energy accrued during both a monotonic fracture process and a fatigue process at various elevated temperatures; and (3), the incorporation of the effect of temperature into the axial fatigue lifing model. Both an axial IMF capability and a detailed testing procedure were created. The axial IMF capability was employed in conjunction with the monotonic fracture curve testing procedure to produce fifteen fracture curves at four operating temperatures. The strain energy densities for these fracture curves were compared, leading to the assumption of constant monotonic fracture energy at operating temperatures below the creep activation temperature. [DOI: 10.1115/1.4004394]
C1 [Wertz, John; Shen, M. -H. Herman] Ohio State Univ, Dept Mech & Aerosp Engn, Columbus, OH 43210 USA.
[Scott-Emuakpor, Onome; George, Tommy; Cross, Charles] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Shen, MHH (reprint author), Ohio State Univ, Dept Mech & Aerosp Engn, Columbus, OH 43210 USA.
EM shen.1@osu.edu
FU Dayton Area Graduate Student Institute (DAGSI)
FX The authors would like to thank the Dayton Area Graduate Student
Institute (DAGSI) for their financial support of these endeavors.
Additionally, the authors would like to thank the Air Force Research
Laboratory (AFRL), specifically the Turbine Engine Fatigue Facility
(TEFF), for facility and equipment access and encouragement of this
research. Special thanks to both Mr. Phil Johnson and Ms. Angela Still,
whose support in the development of the IMF capability was critical.
NR 17
TC 5
Z9 5
U1 0
U2 3
PU ASME-AMER SOC MECHANICAL ENG
PI NEW YORK
PA THREE PARK AVE, NEW YORK, NY 10016-5990 USA
SN 0742-4795
J9 J ENG GAS TURB POWER
JI J. Eng. Gas. Turbines Power-Trans. ASME
PD FEB
PY 2012
VL 134
IS 2
AR 024502
DI 10.1115/1.4004394
PG 5
WC Engineering, Mechanical
SC Engineering
GA 868RB
UT WOS:000298540500019
ER
PT J
AU Dick, AJ
Phan, QM
Foley, JR
Spanos, PD
AF Dick, Andrew J.
Phan, Quan M.
Foley, Jason R.
Spanos, Pot D.
TI Calculating scaling function coefficients from system response data for
new discrete wavelet families
SO MECHANICAL SYSTEMS AND SIGNAL PROCESSING
LA English
DT Article
DE Discrete wavelets; Impulse response; Signal analysis
ID SIGNAL; REPRESENTATION; MULTIRESOLUTION; TRANSFORM
AB In this paper, a formula derived from the wavelet dilation equation is presented as a means to calculate scaling function coefficient values for arbitrary waveforms. The performance of this formula is assessed by analyzing the scaling functions of multiple Daubechies wavelets. With the goal of developing new discrete wavelet families that possess the characteristics of a specific system, the formula is applied to analytical and experimental response data. The relationship between the number of coefficients and their ability to successfully capture the features of the signal is studied. Further, a technique is developed for determining the requisite number of coefficients when applying the formula. This formula may serve as the foundation for the development of new families of discrete wavelets which can be based on the nominal characteristics of a given system for use in signal processing and model discretization applications. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Dick, Andrew J.; Phan, Quan M.; Spanos, Pot D.] Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77251 USA.
[Foley, Jason R.] USAF, Fuzes Branch, Munit Directorate, Res Lab, Eglin AFB, FL USA.
RP Dick, AJ (reprint author), Rice Univ, Dept Mech Engn & Mat Sci, Houston, TX 77251 USA.
EM andrew.j.dick@rice.edu
OI Dick, Andrew/0000-0002-7075-5156
FU AFOSR [FA8651-10-2-0006]; AFRL [FA8651-10-2-0006]
FX The authors would like to thank AFOSR and AFRL for the support of this
research effort in the form of the Air Force Summer Faculty Fellowship
Program and Cooperative Agreement No. FA8651-10-2-0006. The Vietnamese
Ministry of Education and Training is thanked for supporting QP.
NR 24
TC 1
Z9 1
U1 0
U2 5
PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
PI LONDON
PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND
SN 0888-3270
J9 MECH SYST SIGNAL PR
JI Mech. Syst. Signal Proc.
PD FEB
PY 2012
VL 27
BP 362
EP 369
DI 10.1016/j.ymssp.2011.09.015
PG 8
WC Engineering, Mechanical
SC Engineering
GA 873FA
UT WOS:000298865300003
ER
PT J
AU Sihn, S
Varshney, V
Roy, AK
Farmer, BL
AF Sihn, Sangwook
Varshney, Vikas
Roy, Ajit K.
Farmer, Barry L.
TI Prediction of 3D elastic moduli and Poisson's ratios of pillared
graphene nanostructures
SO CARBON
LA English
DT Article
ID WALLED CARBON NANOTUBES; NETWORK; ARCHITECTURES; MECHANISM; TRANSPORT;
ELEMENT
AB A computational finite element analysis based on a structural molecular mechanics approach was conducted to predict effective mechanical stiffness properties of a novel 3D carbon structure, pillared graphene structure (PGS), which is constituted with several graphene sheets and single-walled carbon nanotubes. Four sets of representative unitcell models were developed atomistically for predicting the mechanical properties of PGSs having different values of pillar length and inter-pillar distance. We introduced proper selections of the periodic geometry and boundary conditions which enabled our unitcell model to yield consistent results on the property prediction without any size or edge effects. The parametric study shows that the pillar length and inter-pillar distance significantly affect the effective in-plane and through-thickness properties. PGSs with shorter pillars in height yield higher planar Young's and shear moduli, while those with smaller interpillar distance yield higher through-thickness moduli. Negative in-plane Poisson's ratios are observed for all sets of PGSs and are associated with the curvature at the junction. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Sihn, Sangwook] Univ Dayton, Res Inst, Multiscale Composites & Polymer Div, Dayton, OH 45469 USA.
[Sihn, Sangwook; Varshney, Vikas; Roy, Ajit K.; Farmer, Barry L.] USAF, Res Lab, Mat & Mfg Directorate, AFRL RXBT, Wright Patterson AFB, OH 45433 USA.
[Varshney, Vikas] Univ Technol Corp, Dayton, OH 45432 USA.
RP Sihn, S (reprint author), Univ Dayton, Res Inst, Multiscale Composites & Polymer Div, 300 Coll Pk, Dayton, OH 45469 USA.
EM sangwook@alumni.stanford.edu
FU US Air Force Research Laboratory [FA8650-05-D-5050,
FA8650-07-D-5800-20]; Air Force Office of Scientific Research
FX This work was financially supported by US Air Force Research Laboratory
with Contract Nos. FA8650-05-D-5050 and FA8650-07-D-5800-20 and Air
Force Office of Scientific Research. The authors also thank Dr. G.
Froudakis for providing initial structures for the pillared-graphene
systems.
NR 30
TC 18
Z9 18
U1 5
U2 41
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0008-6223
J9 CARBON
JI Carbon
PD FEB
PY 2012
VL 50
IS 2
BP 603
EP 611
DI 10.1016/j.carbon.2011.09.019
PG 9
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 853AD
UT WOS:000297397700030
ER
PT J
AU Kota, K
Chow, L
Leland, Q
AF Kota, Krishna
Chow, Louis
Leland, Quinn
TI Laminar film condensation driven latent thermal energy storage in
rectangular containers
SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
LA English
DT Article
DE Film condensation; Phase change material; Thermal energy storage; Porous
foam; Melting; Low temperature waste heat recovery
ID PHASE-CHANGE; NATURAL-CONVECTION; VERTICAL PLATE; POROUS-MEDIA; DESIGN
AB This paper focuses on numerically analyzing the thermal transport phenomena in the transient conjugate problem of melting and laminar film condensation. The key focus is to identify an optimum container aspect ratio/shape and conditions for which the heat storage time and the storage capacity are minimum and maximum respectively. Since most solid-liquid phase change materials (PCMs) suffer from poor thermal conductivities, the major resistance to heat transfer comes from PCM. Hence, high thermal conductivity, low-cost metal foam is suggested for use along with PCM to minimize this resistance. The conjugate transient problem of film condensation driven solid-liquid phase change of PCM impregnated inside porous metal foam is numerically analyzed. An effective heat capacity formulation is employed for modeling the transient PCM phase change in porous foam and is solved using finite element method. It is coupled with laminar film condensation on the outside of the storage container. The model is then used for selecting the best aspect ratio for thermal energy storage (TES) containers that enables to store comparatively the maximum heat. The results of the developed model showed that the major resistance to heat transfer and hence efficient thermal energy storage depends strongly on the aspect ratio of the PCM storage containers. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Kota, Krishna] Georgia Inst Technol, George W Woodruff Sch Mech Engn, Atlanta, GA 30332 USA.
[Chow, Louis] Univ Cent Florida, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA.
[Leland, Quinn] USAF, Res Lab, Prop Directorate, Energy Power Thermal Div, Dayton, OH 45433 USA.
RP Kota, K (reprint author), Alcatel Lucent, Bell Labs, Mt Ave,Room 1D-347, Murray Hill, NJ 07974 USA.
EM Krishna.Kota@alcatel-lucent.com; Louis.Chow@ucf.edu;
Quinn.Leland@wpafb.af.mil
NR 30
TC 3
Z9 3
U1 4
U2 17
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0017-9310
J9 INT J HEAT MASS TRAN
JI Int. J. Heat Mass Transf.
PD JAN 31
PY 2012
VL 55
IS 4
BP 1208
EP 1217
DI 10.1016/j.ijheatmasstransfer.2011.09.036
PG 10
WC Thermodynamics; Engineering, Mechanical; Mechanics
SC Thermodynamics; Engineering; Mechanics
GA 895BC
UT WOS:000300470200071
ER
PT J
AU Cleary, JW
Medhi, G
Shahzad, M
Rezadad, I
Maukonen, D
Peale, RE
Boreman, GD
Wentzell, S
Buchwald, WR
AF Cleary, Justin W.
Medhi, Gautam
Shahzad, Monas
Rezadad, Imen
Maukonen, Doug
Peale, Robert E.
Boreman, Glenn D.
Wentzell, Sandy
Buchwald, Walter R.
TI Infrared surface polaritons on antimony
SO OPTICS EXPRESS
LA English
DT Article
ID DOPED SILICON; THIN-FILMS; SILICIDES
AB The semimetal antimony, with a plasma frequency similar to 80 times less than that of gold, is potentially useful as a host for infrared surface polaritons (SPs). Relevant IR SP properties, including the frequency-dependent propagation length and penetration depths for fields into the media on either side of the interface, were determined from optical constants measured on optically-thick thermally-evaporated Sb films over the wavelength range 1 to 40 mu m. Plasma and carrier relaxation frequencies were determined from Drude-model fits to these data. The real part of the permittivity is negative for wavelengths beyond 11 mu m. Distinct resonant decreases in specular reflected intensity were observed for Sb lamellar gratings in the wavelength range of 6 to 11 mu m, where the real part of the permittivity is positive. Both resonance angles and the angular reflectance spectral line shapes are in agreement with theory for excitation of bound surface electromagnetic waves (SPs). Finite element method (FEM) electrodynamic simulations indicate the existence of SP modes under conditions matching the experiments. FEM results also show that such waves depend on having a significant imaginary part of the permittivity, as has been noted earlier for the case of surface exciton polaritons. (C) 2012 Optical Society of America
C1 [Cleary, Justin W.] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Medhi, Gautam; Shahzad, Monas; Rezadad, Imen; Maukonen, Doug; Peale, Robert E.] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA.
[Boreman, Glenn D.] Univ N Carolina, Dept Phys & Opt Sci, Charlotte, NC 28223 USA.
[Wentzell, Sandy; Buchwald, Walter R.] Solid State Sci Corp, Hollis, NH 03049 USA.
RP Cleary, JW (reprint author), USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Justin.Cleary@WPAFB.af.mil
FU AFOSR (Gernot Pomrenke PM) LRIR [09RY09COR, FA95501010030]; NSF SBIR
[IIP-0944520]
FX Support for this work is provided in part by AFOSR (Gernot Pomrenke PM)
LRIR award number 09RY09COR and Grant FA95501010030 as well as by an NSF
SBIR Phase I award IIP-0944520.
NR 24
TC 13
Z9 13
U1 0
U2 9
PU OPTICAL SOC AMER
PI WASHINGTON
PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA
SN 1094-4087
J9 OPT EXPRESS
JI Opt. Express
PD JAN 30
PY 2012
VL 20
IS 3
BP 2693
EP 2705
DI 10.1364/OE.20.002693
PG 13
WC Optics
SC Optics
GA 895ME
UT WOS:000300499500075
PM 22330506
ER
PT J
AU Kuznetsov, AV
Shaysultanov, DG
Stepanov, ND
Salishchev, GA
Senkov, ON
AF Kuznetsov, A. V.
Shaysultanov, D. G.
Stepanov, N. D.
Salishchev, G. A.
Senkov, O. N.
TI Tensile properties of an AlCrCuNiFeCo high-entropy alloy in as-cast and
wrought conditions
SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES
MICROSTRUCTURE AND PROCESSING
LA English
DT Article
DE Electron microscopy; Mechanical characterization; High entropy alloy;
Thermomechanical processing; Grain refinement; Plasticity
ID MECHANICAL-PROPERTIES; SUBMICROCRYSTALLINE STRUCTURE; MULTIPRINCIPAL
ELEMENTS; COMPRESSIVE PROPERTIES; MICROSTRUCTURE; AL0.5COCRCUFENI;
DEFORMATION; TEMPERATURE; BEHAVIORS; SYSTEM
AB Extensive multistep forging at 950 degrees C was applied to the cast AlCuCrFeNiCo high-entropy alloy to transform the cast coarse dendritic structure into a fine equiaxed duplex structure consisting of the mixture of BCC and FCC phases, with the average grain/particle size of similar to 1.5 +/- 0.9 mu m. Tensile properties of the alloy in the as-cast and forged conditions were determined in the temperature range of 20-1000 degrees C. The hot forged alloy was stronger and more ductile during testing at room temperature, than the as-cast alloy. The yield stress (YS), ultimate tensile strength (UTS), and tensile ductility (delta) of the forged condition were 1040 MPa, 1170 MPa, and 1%, respectively, against 790 MPa, 790 MPa and 0.2% for the as-cast condition. In both conditions, the alloy showed brittle to ductile transition (BDT), with a noticeable increase in the tensile ductility within a narrow temperature range. In the as-cast condition, this transition occurred between 700 and 800 degrees C, while in the forged condition, it was observed between 600 and 700 degrees C. With an increase in the testing temperature above the BDT, a continuous decrease in tensile flow stress and an increase in tensile ductility were observed. In the temperature range of 800-1000 degrees C, the forged alloy showed superplastic behavior. The tensile elongation was above 400% and reached 860% at 1000 degrees C. (C) 2011 Elsevier B.V. All rights reserved.
C1 [Kuznetsov, A. V.; Shaysultanov, D. G.; Stepanov, N. D.; Salishchev, G. A.] Belgorod State Univ, Lab Bulk Nanostruct Mat, Belgorod 308015, Russia.
[Senkov, O. N.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Senkov, O. N.] UES Inc, Dayton, OH 45432 USA.
RP Kuznetsov, AV (reprint author), Belgorod State Univ, Lab Bulk Nanostruct Mat, Pobeda 85, Belgorod 308015, Russia.
EM kuznetsov@bsu.edu.ru
RI Senkov, Oleg/C-7197-2012; Kuznetsov, Andrey/E-9933-2014; Salishchev,
Gennady/G-4767-2016; Stepanov, Nikita/D-6279-2015
OI Senkov, Oleg/0000-0001-5587-415X; Salishchev,
Gennady/0000-0002-0815-3525; Stepanov, Nikita/0000-0003-2476-3953
FU Ministry of Science and Education of Russian Federation [02.740.11.5184]
FX This work was supported by the Ministry of Science and Education of
Russian Federation, grant no. 02.740.11.5184.
NR 29
TC 76
Z9 77
U1 15
U2 87
PU ELSEVIER SCIENCE SA
PI LAUSANNE
PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND
SN 0921-5093
J9 MAT SCI ENG A-STRUCT
JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process.
PD JAN 30
PY 2012
VL 533
BP 107
EP 118
DI 10.1016/j.msea.2011.11.045
PG 12
WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary;
Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Materials Science; Metallurgy &
Metallurgical Engineering
GA 891GS
UT WOS:000300205800015
ER
PT J
AU Buchwald, WR
Cleary, JW
Hendrickson, J
AF Buchwald, Walter R.
Cleary, Justin W.
Hendrickson, Joshua
TI Surface depletion mediated control of inter-sub-band absorption in
GaAs/AlAs semiconductor quantum well systems
SO APPLIED PHYSICS LETTERS
LA English
DT Article
DE aluminium compounds; conduction bands; electron gas; etching; Fourier
transform spectra; gallium arsenide; III-V semiconductors; semiconductor
quantum wells; transmission electron microscopy
AB The modification of quantum well inter-sub-band absorption properties due to surface depletion induced band bending is reported. Fourier transform infrared spectroscopy measurements of a GaAs/AlAs multiple quantum well system reveal a reduction in the characteristic absorption resonance in correlation with wet chemical etching. High resolution transmission electron microscopy confirms the presence of the quantum wells after etching, suggesting the quantum wells are positioned within the surface depletion region of the structure. This method of inter-sub-band absorption modification could be used for the formation of quantum dots from a quantum well system with the precise, deterministic control of their location.(C) 2012 American Institute of Physics. [doi: 10.1063/1.3680232]
C1 [Buchwald, Walter R.] Solid State Sci Corp, Nashua, NH 03060 USA.
[Buchwald, Walter R.] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA.
[Cleary, Justin W.; Hendrickson, Joshua] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Buchwald, WR (reprint author), Solid State Sci Corp, Nashua, NH 03060 USA.
EM walter.buchwald@solidstatescientific.com
FU AFOSR LRIR [09RY08COR]
FX Support for this work is provided by AFOSR LRIR award number 09RY08COR
(Gernot Pomrenke, PM).
NR 8
TC 1
Z9 1
U1 2
U2 11
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0003-6951
J9 APPL PHYS LETT
JI Appl. Phys. Lett.
PD JAN 30
PY 2012
VL 100
IS 5
AR 051110
DI 10.1063/1.3680232
PG 3
WC Physics, Applied
SC Physics
GA 889HW
UT WOS:000300065300010
ER
PT J
AU Polizos, G
Tuncer, E
Agapov, AL
Stevens, D
Sokolov, AP
Kidder, MK
Jacobs, JD
Koerner, H
Vaia, RA
More, KL
Sauers, I
AF Polizos, G.
Tuncer, E.
Agapov, A. L.
Stevens, D.
Sokolov, A. P.
Kidder, M. K.
Jacobs, J. D.
Koerner, H.
Vaia, R. A.
More, K. L.
Sauers, I.
TI Effect of polymer-nanoparticle interactions on the glass transition
dynamics and the conductivity mechanism in polyurethane titanium dioxide
nanocomposites
SO POLYMER
LA English
DT Article
DE Nanocomposites; Dynamics; Conductivity
ID MOLECULAR-DYNAMICS; IONIC-CONDUCTIVITY; THERMOPLASTIC POLYURETHANE;
ELECTRICAL-CONDUCTIVITY; DIELECTRIC-SPECTROSCOPY; HYPERBRANCHED
POLYESTER; RELAXATION PROCESSES; TIO2 NANOPARTICLES; ROOM-TEMPERATURE;
FORMING LIQUIDS
AB We report on the glass transition dynamics and the conductivity properties of a nanodielectric system composed of pre-synthesized TiO2 nanoparticles embedded in thermoplastic polyurethane. Increase of TiO2 loading results in enhanced segmental mobility of the composites and less steep temperature dependence, i.e., lower fragility index. The decrease in the fragility index and glass transition temperature is discussed based on the FTIR results. We observe different behavior of conductivity for temperatures above and below the glass transition temperature. At high temperatures the composites exhibit conductivity values more than 2 orders of magnitude higher than those in the pristine matrix. At the same time, at sub-T-g temperatures composites are characterized by superior electrical insulation properties compared to pristine matrix material. Such drastic temperature dependence of the conductivity/insulating ability of the flexible and light-weight, low-T-g composite material can be utilized in various applications including sensing and temperature switching materials. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Polizos, G.; Tuncer, E.; Agapov, A. L.; Stevens, D.; Sokolov, A. P.; Kidder, M. K.; More, K. L.; Sauers, I.] Oak Ridge Natl Lab, Oak Ridge, TN 37831 USA.
[Jacobs, J. D.; Koerner, H.; Vaia, R. A.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Tuncer, E.] GE Global Res Ctr, Dielect & Electrophys Lab, Niskayuna, NY 12309 USA.
RP Polizos, G (reprint author), Oak Ridge Natl Lab, 1 Bethel Valley Rd, Oak Ridge, TN 37831 USA.
EM polyzosg@ornl.gov
RI More, Karren/A-8097-2016;
OI More, Karren/0000-0001-5223-9097; Tuncer, Enis/0000-0002-9324-4324
FU U.S. Department of Energy-Office of Electricity Delivery and Energy
Reliability; Oak Ridge National Laboratory [DE-AC05-00OR22725];
Scientific User Facilities Division, Office of Basic Energy Sciences,
U.S. Department of Energy; Division of Materials Sciences and
Engineering, DOE Office of Basic Energy Sciences
FX Research sponsored by the U.S. Department of Energy-Office of
Electricity Delivery and Energy Reliability, Advanced Cables and
Conductors Program for Electric Power Systems under contract
DE-AC05-00OR22725 with Oak Ridge National Laboratory, managed and
operated by UT-Battelle, LLC, and in part by the Oak Ridge National
Laboratory's SHaRE User Facility, which is sponsored by the Scientific
User Facilities Division, Office of Basic Energy Sciences, U.S.
Department of Energy. DS and APS thank Division of Materials Sciences
and Engineering, DOE Office of Basic Energy Sciences for the financial
support.
NR 65
TC 20
Z9 21
U1 8
U2 97
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0032-3861
J9 POLYMER
JI Polymer
PD JAN 24
PY 2012
VL 53
IS 2
BP 595
EP 603
DI 10.1016/j.polymer.2011.11.050
PG 9
WC Polymer Science
SC Polymer Science
GA 883BK
UT WOS:000299607400039
ER
PT J
AU Anderson, KD
Young, SL
Jiang, H
Jakubiak, R
Bunning, TJ
Naik, RR
Tsukruk, VV
AF Anderson, Kyle D.
Young, Seth L.
Jiang, Hao
Jakubiak, Rachel
Bunning, Timothy J.
Naik, Rajesh R.
Tsukruk, Vladimir V.
TI Plasma-Enhanced Copolymerization of Amino Acid and Synthetic Monomers
SO LANGMUIR
LA English
DT Article
ID CHEMICAL-VAPOR-DEPOSITION; SELF-ASSEMBLED MONOLAYERS; NANOCOMPOSITE
THIN-FILMS; POLY(2-HYDROXYETHYL METHACRYLATE); BIOMEDICAL APPLICATIONS;
TITANIA NANOPARTICLES; OPTICAL-PROPERTIES; POLYMERIZED FILMS; PEPTIDE
NANOTUBES; PHOTONIC FILMS
AB In this paper we report the use of plasma-enhanced chemical vapor deposition (PECVD) for the simultaneous deposition and copolymerization of an amino acid with other organic and inorganic monomers. We investigate the fundamental effects of plasma-enhanced copolymerization on different material chemistries in stable ultrathin coatings of mixed composition with an amino acid component. This study serves to determine the feasibility of a direct, facile method for integrating biocompatible/active materials into robust polymerized coatings with the ability to plasma copolymerize a biological molecule (L-tyrosine) with different synthetic materials in a dry, one-step process to form ultrathin coatings of mixed composition. This process may lead to a method of interfacing biologic systems with synthetic materials as a way to enhance the biomaterial tissue interface and preserve biological activity within composite films.
C1 [Anderson, Kyle D.; Young, Seth L.; Tsukruk, Vladimir V.] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.
[Jiang, Hao; Jakubiak, Rachel; Bunning, Timothy J.; Naik, Rajesh R.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, Dayton, OH 45433 USA.
RP Tsukruk, VV (reprint author), Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA.
EM vladimir@mse.gatech.edu
FU Department of Defense; Air Force Office of Scientific Research
[FA9550-08-1-0446, FA9550-09-1-0162]; Air Force Research Laboratory
FX This work was supported by the Department of Defense (Doll) through the
National Defense Science & Engineering Graduate Fellowship (NDSEG)
program. This research is also supported by the Air Force Office of
Scientific Research (Grants FA9550-08-1-0446 and FA9550-09-1-0162), as
well as the Air Force Research Laboratory. We also thank R. Blake Weber
for technical assistance.
NR 75
TC 10
Z9 10
U1 1
U2 27
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0743-7463
J9 LANGMUIR
JI Langmuir
PD JAN 24
PY 2012
VL 28
IS 3
BP 1833
EP 1845
DI 10.1021/la204416h
PG 13
WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science,
Multidisciplinary
SC Chemistry; Materials Science
GA 879XP
UT WOS:000299366500022
PM 22176716
ER
PT J
AU Liu, J
Choi, H
Kim, JY
Bailey, C
Durstock, M
Dai, LM
AF Liu, Jun
Choi, Hyosung
Kim, Jin Young
Bailey, Chris
Durstock, Michael
Dai, Liming
TI Highly Crystalline and Low Bandgap Donor Polymers for Efficient Polymer
Solar Cells
SO ADVANCED MATERIALS
LA English
DT Article
DE polymer solar cells; conjugated polymers; crystallinity; coplanar
configuration; high-temperature solution processing
ID OPEN-CIRCUIT VOLTAGE; HIGH-PERFORMANCE; PHOTOVOLTAIC APPLICATIONS;
SEMICONDUCTING POLYMERS; SIDE-CHAINS; HETEROJUNCTIONS; DERIVATIVES;
COPOLYMERS; ATOM
AB A highly crystalline and low bandgap donor polymer, EI-PFDTBT, is developed by inserting ethylene bridging units to ensure a coplanar configuration between the side chains and the main chain. Polymer solar cells based on the EI-PFDTBT and PC(71)BM blends spincoated at elevated temperatures exhibit a power conversion efficiency of 5.1%.
C1 [Liu, Jun; Dai, Liming] Case Western Reserve Univ, Dept Macromol Sci & Engn, Case Sch Engn, Cleveland, OH 44106 USA.
[Choi, Hyosung; Kim, Jin Young] UNIST, Interdisciplinary Sch Green Energy, Ulsan 689798, South Korea.
[Bailey, Chris; Durstock, Michael] USAF, Mat & Mfg Directorate, Res Lab, RXBP, Wright Patterson AFB, OH 45433 USA.
RP Dai, LM (reprint author), Case Western Reserve Univ, Dept Macromol Sci & Engn, Case Sch Engn, 10900 Euclid Ave, Cleveland, OH 44106 USA.
EM liming.dai@case.edu
RI Kim, Jin Young/E-6152-2010; Choi, Hyosung /G-5255-2013; HYOSUNG,
CHOI/P-2212-2015
OI Kim, Jin Young/0000-0002-6595-4468; Choi, Hyosung /0000-0003-0382-2467;
FU AFOSR [FA9550-09-1-0331]; World Class University (WCU); National
Research Foundation; Ministry of Education, Science and Technology of
Korea through UNIST; Ministry of Science and Technology of China
[2009DFB30380]; Zhejiang Department of Science and Technology
[2009C13019]; Zhejiang Department of Education [Y200906587]
FX The authors are grateful for the financial support from AFOSR
(FA9550-09-1-0331), the World Class University (WCU) program supported
by National Research Foundation and Ministry of Education, Science and
Technology of Korea through UNIST, the Ministry of Science and
Technology of China (2009DFB30380), the Zhejiang Department of Science
and Technology (2009C13019), and the Zhejiang Department of Education
(Y200906587). J.L. thanks Dr. Ina Martin and Dr. Yuhua Xue for technical
support.
NR 29
TC 40
Z9 40
U1 3
U2 52
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 0935-9648
J9 ADV MATER
JI Adv. Mater.
PD JAN 24
PY 2012
VL 24
IS 4
BP 538
EP +
DI 10.1002/adma.201103623
PN 20
PG 6
WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience &
Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied;
Physics, Condensed Matter
SC Chemistry; Science & Technology - Other Topics; Materials Science;
Physics
GA 877DF
UT WOS:000299156400014
PM 22213125
ER
PT J
AU Christ, JA
Pennell, KD
Abriola, LM
AF Christ, John A.
Pennell, Kurt D.
Abriola, Linda M.
TI Quantification of experimental subsurface fluid saturations from
high-resolution source zone images
SO WATER RESOURCES RESEARCH
LA English
DT Article
ID HETEROGENEOUS POROUS-MEDIA; NONAQUEOUS-PHASE LIQUIDS; DNAPL SOURCE
ZONES; MASS-REMOVAL; PORE-SCALE; LIGHT TRANSMISSION; REMEDIATION; FIELD;
FLOW; VISUALIZATION
AB Laboratory-scale aquifer cells are commonly used to investigate processes governing contaminant fate and transport in heterogeneous subsurface systems. In recent years, dramatic improvements in image processing methods have led to increasingly refined image resolution in these experiments. With these enhanced imagining methodologies, system parameters, such as nonaqueous phase liquid (NAPL) saturation, can now be quantified at the submillimeter scale. This fine level of resolution, however, is generally inconsistent with the typical scale of a representative elementary volume (REV), the averaging volume associated with property evaluation in continuum-based flow and transport models. Such inconsistency of scales calls into question the practice of directly comparing laboratory observations with continuum-based model simulations. This work explores the application of alternative approaches to image data processing for characterization of NAPL source zone architecture in aquifer cells and examines the implications of data processing on the interpretation of experimental-model comparisons. The utility of two alternative upscaling methods, a continuity-equation based (CB) and discrete-block based (DBB) approach are considered. Examination of the stability of point averages of saturation demonstrates that a REV length scale can be defined as similar to 30 x d(50) for the thickness-averaged, two-dimensional aquifer cell experiments examined. Quantification of upscaled source zone metrics, including the average saturation, the second spatial moment in the vertical direction, and the ganglia-to-pool (GTP) mass ratio reveals that the GTP is strongly sensitive to observation scale. Use of GTP values computed from upscaled images is shown to improve mathematical model predictions of experimental effluent concentrations by nearly 50%.
C1 [Pennell, Kurt D.; Abriola, Linda M.] Tufts Univ, Dept Civil & Environm Engn, Medford, MA 02155 USA.
[Christ, John A.] USAF Acad, Dept Civil & Environm Engn, Colorado Springs, CO 80840 USA.
RP Christ, JA (reprint author), USAF Acad, Dept Civil & Environm Engn, Colorado Springs, CO 80840 USA.
EM john.christ@usafa.edu
RI Pennell, Kurt/F-6862-2010
OI Pennell, Kurt/0000-0002-5788-6397
FU Strategic Environmental Research and Development Program [ER-1612,
W91HQ-08-C-0003]
FX This research was sponsored by Strategic Environmental Research and
Development Program Project ER-1612 (contract W91HQ-08-C-0003). The
content of this manuscript has not been subject to agency review and
does not necessarily represent the view of the sponsoring agency. The
authors gratefully acknowledge the experimental efforts of Eric Suchomel
and Doug Walker, who aided with data collection and analysis.
NR 41
TC 3
Z9 3
U1 0
U2 18
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0043-1397
J9 WATER RESOUR RES
JI Water Resour. Res.
PD JAN 20
PY 2012
VL 48
AR W01517
DI 10.1029/2011WR010400
PG 13
WC Environmental Sciences; Limnology; Water Resources
SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water
Resources
GA 880DU
UT WOS:000299385700002
ER
PT J
AU Ramezani, H
Kottos, T
Kovanis, V
Christodoulides, DN
AF Ramezani, Hamidreza
Kottos, Tsampikos
Kovanis, Vassilios
Christodoulides, Demetrios N.
TI Exceptional-point dynamics in photonic honeycomb lattices with PT
symmetry
SO PHYSICAL REVIEW A
LA English
DT Article
ID NON-HERMITIAN HAMILTONIANS; SPONTANEOUS EMISSION; CONICAL DIFFRACTION;
PSEUDO-HERMITICITY; REAL SPECTRA; PT-SYMMETRY; LASERS; OPTICS
AB We theoretically investigate the flow of electromagnetic waves in complex honeycomb photonic lattices with local PT symmetries. Such PT structure is introduced via a judicious arrangement of gain and loss across the honeycomb lattice, characterized by a gain and loss parameter gamma. We found a class of conical diffraction phenomena where the formed cone is brighter and travels along the lattice with a transverse speed proportional to root gamma.
C1 [Ramezani, Hamidreza; Kottos, Tsampikos] Wesleyan Univ, Dept Phys, Middletown, CT 06459 USA.
[Kottos, Tsampikos] MPI Dynam & Self Org, D-37073 Gottingen, Germany.
[Kovanis, Vassilios] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Christodoulides, Demetrios N.] Univ Cent Florida, Coll Opt Photon CREOL, Orlando, FL 32816 USA.
RP Ramezani, H (reprint author), Wesleyan Univ, Dept Phys, Middletown, CT 06459 USA.
FU AFOSR [FA 9550-10-1-0433, FA 9550-10-1-0561]; NSF [ECCS-1128571]; AFOSR
LRIR [09RY04COR]
FX T.K. and H.R. acknowledge support by a AFOSR No. FA 9550-10-1-0433
grant, NSF ECCS-1128571 grant and D.N.C. acknowledges a AFOSR No. FA
9550-10-1-0561 grant. V.K.'s work was supported via AFOSR LRIR
09RY04COR.
NR 45
TC 42
Z9 42
U1 1
U2 24
PU AMER PHYSICAL SOC
PI COLLEGE PK
PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA
SN 1050-2947
J9 PHYS REV A
JI Phys. Rev. A
PD JAN 17
PY 2012
VL 85
IS 1
AR 013818
DI 10.1103/PhysRevA.85.013818
PG 6
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA 878NP
UT WOS:000299264100012
ER
PT J
AU Deneault, JR
Xiao, XY
Kang, TS
Wang, JS
Wai, CM
Brown, GJ
Durstock, MF
AF Deneault, James R.
Xiao, Xiaoyin
Kang, Tae-Sik
Wang, Joanna S.
Wai, Chien M.
Brown, Gail J.
Durstock, Michael F.
TI Free-Standing Arrays of Isolated TiO2 Nanotubes through Supercritical
Fluid Drying
SO CHEMPHYSCHEM
LA English
DT Article
DE infiltration; nanotubes; supercritical fluids; template synthesis;
titanium dioxide
ID METHANOL OXIDATION; TITANIA NANOTUBES; ANODIC ALUMINA; POROUS ALUMINA;
ACID; FABRICATION; SYSTEM
AB A common complication in fabricating arrays of TiO2 nanotubes is that they agglomerate into tightly packed bundles during the inevitable solvent evaporation step. This problem is particularly acute for template-fabricated TiO2 nanotubes, as the geometric tunability of this technique enables relatively large inter-pore spacings or, from another perspective, more space for lateral displacement. Our work showed that agglomeration results from the surface tension forces that are present as the ambient solvent is evaporated from the nanotube film. Herein, we report a processing and fabrication approach that utilizes supercritical fluid drying (CO2) to prepare arrays of template-fabricated TiO2 nanotubes that are free-standing and spatially isolated. This approach could be beneficial to many emerging technologies, such as solid-state dye-sensitized solar cells and vertically-oriented carbon nanotube electrodes.
C1 [Deneault, James R.; Xiao, Xiaoyin; Kang, Tae-Sik; Wang, Joanna S.; Brown, Gail J.; Durstock, Michael F.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Deneault, James R.; Kang, Tae-Sik] Universal Technol Corp, Dayton, OH 45432 USA.
[Wang, Joanna S.; Wai, Chien M.] Univ Idaho, Dept Chem, Moscow, ID 83844 USA.
RP Brown, GJ (reprint author), USAF, Mat & Mfg Directorate, Res Lab, 2941 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM michael.durstock@wpafb.af.mil
FU Air Force Research Laboratory's (AFRL) Materials and Manufacturing
Directorate; Air Force Office of Scientific Research (AFOSR); AFRL
[DURI-FA8650-06-D-5401]
FX This work was sponsored by the Air Force Research Laboratory's (AFRL)
Materials and Manufacturing Directorate and the Air Force Office of
Scientific Research (AFOSR). Support of AFRL (DURI-FA8650-06-D-5401) for
JSW and CMW is acknowledged. Dr. Hilmar Koerner (UES Inc., Dayton OH) is
gratefully acknowledged for his assistance in obtaining XRD spectra.
NR 19
TC 6
Z9 7
U1 2
U2 28
PU WILEY-BLACKWELL
PI MALDEN
PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA
SN 1439-4235
J9 CHEMPHYSCHEM
JI ChemPhysChem
PD JAN 16
PY 2012
VL 13
IS 1
BP 256
EP 260
DI 10.1002/cphc.201100633
PG 5
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 873WG
UT WOS:000298913500033
PM 22147515
ER
PT J
AU Joshi, RP
Sridhara, V
Jogai, B
Shah, P
del Rosario, RD
AF Joshi, R. P.
Sridhara, V.
Jogai, B.
Shah, P.
del Rosario, R. D.
TI Analysis of dislocation scattering on electron mobility in GaN high
electron mobility transistors (vol 93, pg 10046, 2003)
SO JOURNAL OF APPLIED PHYSICS
LA English
DT Correction
C1 [Joshi, R. P.; Sridhara, V.] Old Dominion Univ, Dept Elect & Comp Engn, Norfolk, VA 23529 USA.
[Jogai, B.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Jogai, B.] Wright State Univ, Semicond Res Ctr, Dayton, OH 45435 USA.
[Shah, P.; del Rosario, R. D.] USA, Res Lab, Adelphi, MD 20783 USA.
RP Joshi, RP (reprint author), Old Dominion Univ, Dept Elect & Comp Engn, Norfolk, VA 23529 USA.
EM rjoshi@odu.edu
NR 1
TC 0
Z9 0
U1 2
U2 5
PU AMER INST PHYSICS
PI MELVILLE
PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1,
MELVILLE, NY 11747-4501 USA
SN 0021-8979
J9 J APPL PHYS
JI J. Appl. Phys.
PD JAN 15
PY 2012
VL 111
IS 2
AR 029901
DI 10.1063/1.3679426
PG 1
WC Physics, Applied
SC Physics
GA 885PX
UT WOS:000299792400110
ER
PT J
AU Luo, H
Segawa, H
Visbal, MR
AF Luo, Hong
Segawa, Hidehiro
Visbal, Miguel R.
TI An implicit discontinuous Galerkin method for the unsteady compressible
Navier-Stokes equations
SO COMPUTERS & FLUIDS
LA English
DT Article
DE Discontinuous Galerkin methods; Implicit methods; Compressible
Navier-Stokes equations
ID FINITE-ELEMENT-METHOD; UNSTRUCTURED GRIDS; CONSERVATION-LAWS; ARBITRARY
GRIDS; EULER EQUATIONS; FLOWS; ACCURATE; SCHEME
AB A high-order implicit discontinuous Galerkin method is developed for the time-accurate solutions to the compressible Navier-Stokes equations. The spatial discretization is carried out using a high order discontinuous Galerkin method, where polynomial solutions are represented using a Taylor basis. A second order implicit method is applied for temporal discretization to the resulting ordinary differential equations. The resulting non-linear system of equations is solved at each time step using a pseudo-time marching approach. A newly developed fast, p-multigrid is then used to obtain the steady state solution to the pseudo-time system. The developed method is applied to compute a variety of unsteady subsonic viscous flow problems. The numerical results obtained indicate that the use of this implicit method leads to significant improvements in performance over its explicit counterpart, while without significant increase in memory requirements. (C) 2011 Elsevier Ltd. All rights reserved.
C1 [Luo, Hong; Segawa, Hidehiro] N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA.
[Visbal, Miguel R.] USAF, Computat Sci Branch, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Luo, H (reprint author), N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA.
EM hong_luo@ncsu.edu
RI Luo, Hong/A-9133-2011
FU Air Force Summer faculty Fellowship Program
FX The first author would like to acknowledge the partial support for this
work provided by the Air Force Summer faculty Fellowship Program, while
he was in residence at Computational Sciences Branch, Air Force Research
Laboratory, Dayton, OH.
NR 33
TC 9
Z9 9
U1 0
U2 4
PU PERGAMON-ELSEVIER SCIENCE LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND
SN 0045-7930
J9 COMPUT FLUIDS
JI Comput. Fluids
PD JAN 15
PY 2012
VL 53
BP 133
EP 144
DI 10.1016/j.compfluid.2011.10.009
PG 12
WC Computer Science, Interdisciplinary Applications; Mechanics
SC Computer Science; Mechanics
GA 869UX
UT WOS:000298624800009
ER
PT J
AU Lee, KM
Tabiryan, NV
Bunning, TJ
White, TJ
AF Lee, Kyung Min
Tabiryan, Nelson V.
Bunning, Timothy J.
White, Timothy J.
TI Photomechanical mechanism and structure-property considerations in the
generation of photomechanical work in glassy, azobenzene liquid crystal
polymer networks
SO JOURNAL OF MATERIALS CHEMISTRY
LA English
DT Article
ID LIGHT-INDUCED ORIENTATION; TRANSITION TEMPERATURE; NEMATIC ELASTICA;
SIDE-CHAIN; FILMS; PHOTODRIVEN; ACTUATORS; POLYIMIDE; BEHAVIOR;
ISOMERIZATION
AB Azobenzene-functionalized polymeric materials have proven capable of shape adaptive responses when irradiated with light. This work focuses on isolating the fundamental differences between the photogenerated mechanical output of glassy, polydomain azobenzene liquid crystal polymer networks (azo-LCN) upon exposure to either UV and blue-green irradiation. Profound differences in the fundamental photochemical mechanism are identified through spectroscopic examination of representative materials before and after irradiation with UV or blue-green light. The photomechanical response is further elucidated in structure-property examination to ascertain the role of crosslink density, azobenzene concentration, and azobenzene connectivity (crosslinked or pendant) on the photomechanical output.
C1 [Lee, Kyung Min; Bunning, Timothy J.; White, Timothy J.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Lee, Kyung Min] Azimuth Corp, Dayton, OH 45432 USA.
[Tabiryan, Nelson V.] BEAM Engn Adv Measurements Co, Winter Pk, FL 32789 USA.
RP White, TJ (reprint author), USAF, Mat & Mfg Directorate, Res Lab, 3005 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM Timothy.White2@wfafb.afmil
RI White, Timothy/D-4392-2012
FU Air Force Office of Scientific Research (AFOSR); Materials and
Manufacturing Directorate of the Air Force Research Laboratory
FX This work was financially supported by the Air Force Office of
Scientific Research (AFOSR) and the Materials and Manufacturing
Directorate of the Air Force Research Laboratory. Insightful discussions
with Richard A. Vaia and colleagues are gratefully acknowledged.
NR 46
TC 52
Z9 54
U1 3
U2 77
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 0959-9428
J9 J MATER CHEM
JI J. Mater. Chem.
PD JAN 14
PY 2012
VL 22
IS 2
BP 691
EP 698
DI 10.1039/c1jm14017e
PG 8
WC Chemistry, Physical; Materials Science, Multidisciplinary
SC Chemistry; Materials Science
GA 875HC
UT WOS:000299020000057
ER
PT J
AU Lei, JH
Matsuo, T
Dou, XK
Sutton, E
Luan, XL
AF Lei, Jiuhou
Matsuo, Tomoko
Dou, Xiankang
Sutton, Eric
Luan, Xiaoli
TI Annual and semiannual variations of thermospheric density: EOF analysis
of CHAMP and GRACE data
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID SEMI-ANNUAL VARIATION; HETEROSPHERE; ATMOSPHERE; MODEL
AB In this paper, observations from CHAMP and GRACE during 2002-2010 are used to study the seasonal variations of thermospheric density by characterizing the dominant modes of thermospheric density variability as empirical orthogonal functions (EOFs). Our results showed that the first three EOFs captured most of the density variability, which can be as large as 98% of total density variability. Subsequently, the obtained mean field, first three EOFs and the corresponding amplitudes of three EOFs are applied to construct a thermospheric density model at 400 km to study seasonal variations of thermospheric density under geomagnetically quiet conditions. Thermospheric density shows strong latitudinal dependence in seasonal variation, although it usually has maxima near the equinoxes and minimum in the local winter at middle and high latitudes. Semiannual variations imbedded in the annual variations are seen at all latitudes; annual variations however become dominant in the southern hemisphere. Specifically, the observations show that the annual amplitude can reach as large as 40-50% of the annual mean at high latitudes in the southern hemisphere and it decreases gradually from the southern to northern hemisphere. The semiannual component to the annual mean is about 15-20% without significant latitudinal dependence. Additionally, the relative amplitudes of annual and semiannual variations in the MSISE00 density agree fairly well with the observations, albeit the MSISE00 gives an opposite solar activity dependence for the annual and semiannual variations compared with the positive F107 dependence seen in the observations.
C1 [Lei, Jiuhou; Dou, Xiankang; Luan, Xiaoli] Univ Sci & Technol China, CAS Key Lab Geospace Environm, Dept Geophys & Planetary Sci, Hefei 230026, Peoples R China.
[Matsuo, Tomoko] Univ Colorado, Cooperat Inst Res Environm Sci, Boulder, CO 80305 USA.
[Sutton, Eric] USAF, Res Lab, Kirtland AFB, NM 87117 USA.
[Lei, Jiuhou; Dou, Xiankang; Luan, Xiaoli] Univ Sci & Technol China, Mengcheng Natl Geophys Observ, Sch Earth & Space Sci, Hefei 230026, Peoples R China.
[Matsuo, Tomoko] NOAA, Space Weather Predict Ctr, Boulder, CO USA.
RP Lei, JH (reprint author), Univ Sci & Technol China, CAS Key Lab Geospace Environm, Dept Geophys & Planetary Sci, Hefei 230026, Peoples R China.
EM leijh@ustc.edu.cn
RI Lei, Jiuhou/A-3015-2012; Dou, xiankang/M-9106-2013; Sutton,
Eric/A-1574-2016
OI Lei, Jiuhou/0000-0002-4374-5083; Sutton, Eric/0000-0003-1424-7189
FU National Natural Science Foundation of China [41174139, 41121003,
41104107, 41025016, 40890165]; Thousand Young Talents Program of China;
AFOSR MURI [FA9550-07-1-0565]
FX This work was supported by National Natural Science Foundation of China
(41174139, 41121003, 41104107, 41025016, 40890165), Thousand Young
Talents Program of China, and the AFOSR MURI Award FA9550-07-1-0565.
NR 26
TC 21
Z9 26
U1 0
U2 15
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 2169-9380
EI 2169-9402
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD JAN 13
PY 2012
VL 117
AR A01310
DI 10.1029/2011JA017324
PG 9
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 877KJ
UT WOS:000299178600001
ER
PT J
AU McCollough, JP
Elkington, SR
Baker, DN
AF McCollough, J. P.
Elkington, S. R.
Baker, D. N.
TI The role of Shabansky orbits in compression-related electromagnetic ion
cyclotron wave growth
SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
LA English
DT Article
ID OUTER CUSP; MAGNETOSPHERE; FIELD; PARTICLES; MODEL; ACCELERATION;
GENERATION; DIFFUSION; TRANSPORT; ELECTRONS
AB Electromagnetic ion cyclotron waves at high L values near local noon are often found to be related to magnetospheric compression events. These waves arise from temperature anisotropies in trapped warm plasma populations. There are several possible mechanisms that can generate these temperature anisotropies, including both energizing and nonenergizing processes. In this work we investigate a nonenergizing process arising from dayside bifurcated magnetic field minima. There are two kinds of behavior particles undergo in the presence of bifurcated minima: particles with high initial equatorial pitch angles (EPAs) are forced to execute so-called Shabansky orbits and mirror at high latitudes without passing through the equator, while those with lower initial EPAs will pass through the equator with higher EPAs than before; as a result, perpendicular energies near the equator increase at the cost of parallel energies. By using a 3-D particle tracing code in a tunable analytic compressed-dipole field, we explore the effects of Shabansky orbits on the anisotropy of the warm plasma and contrast with the anisotropy resulting from drift shell splitting. We show that Shabansky orbits are an independent source of temperature anisotropy for warm dayside ions.
C1 [McCollough, J. P.] USAF, Space Vehicles Directorate, Res Lab, Kirtland AFB, NM 87117 USA.
[Elkington, S. R.; Baker, D. N.] Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80303 USA.
RP McCollough, JP (reprint author), USAF, Space Vehicles Directorate, Res Lab, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM james.mccollough@us.af.mil
RI McCollough, James/A-2489-2016
OI McCollough, James/0000-0003-3615-8857
FU Space Vehicles Directorate of the Air Force Research Laboratory; NASA
[NNG04GN11G]; Center for Integrated Space Weather Modeling (CISM) via
NSF STC [ATM-0120950]
FX This research was supported by the Space Vehicles Directorate of the Air
Force Research Laboratory, NASA Goddard grant NNG04GN11G, and the Center
for Integrated Space Weather Modeling (CISM) via NSF STC grant
ATM-0120950.
NR 35
TC 35
Z9 35
U1 0
U2 4
PU AMER GEOPHYSICAL UNION
PI WASHINGTON
PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA
SN 0148-0227
J9 J GEOPHYS RES-SPACE
JI J. Geophys. Res-Space Phys.
PD JAN 12
PY 2012
VL 117
AR A01208
DI 10.1029/2011JA016948
PG 13
WC Astronomy & Astrophysics
SC Astronomy & Astrophysics
GA 877KG
UT WOS:000299178200002
ER
PT J
AU Cooper, TM
Krein, DM
Burke, AR
McLean, DG
Haley, JE
Slagle, J
Monahan, J
Fratini, A
AF Cooper, Thomas M.
Krein, Douglas M.
Burke, Aaron R.
McLean, Daniel G.
Haley, Joy E.
Slagle, Jonathan
Monahan, Jennifer
Fratini, Albert
TI Spectroscopic Structure-Property Relationships of a Series of
Polyaromatic Platinum Acetylides
SO JOURNAL OF PHYSICAL CHEMISTRY A
LA English
DT Article
ID POLYCYCLIC AROMATIC-HYDROCARBONS; CROSSING RATE-CONSTANT; ENERGY-GAP
LAW; EXCITED-STATE DYNAMICS; FLUORESCENCE PARAMETERS; RADIATIONLESS
TRANSITIONS; MOLECULES; COMPLEXES; CHROMOPHORES; ASPHALTENES
AB To develop a structure-spectroscopic property relationship in platinum acetylides having poly(aromatic hydrocarbon) ligands, we synthesized a series of chromophores with systematic variation in the number of fused aromatic rings (nFAR) and ligand topology (polyacene (L), polyphenanthrene (Z), or compact(C)). We measured ground-state absorption, fluorescence, and phosphorescence spectra. We also performed nanosecond and femtosecond transient absorption experiments. To extend the range of compounds in the structure-property relationship, we did DFT calculations on an expanded series of chromophores. Both the results and experiments show that the S-1 and T-1 state energies are a function of both nFAR and the ligand topology. In the L chromophores, the S-1 and T-1 state energies decrease linearly with nFAR. In contrast, the S-1 and T-1 state energies of the Z chromophores oscillate around a fixed value with increasing nFAR The C chromophores have behavior intermediate between the and Z chromophores. A parallel series of calculations on the ligands shows the same behavior. The S-1-S-n energy obtained from ultrafast time resolved spectra has a linear variation in nFAR. The rate constant for nonradiative decay, k(nr), was calculated from the S-1 state lifetime and decreases with an increasing number of pi electrons in the aromatic ring. The result is consistent with the spin-orbit coupling caused by the central platinum heavy atom decreasing with larger nFAR. The present work shows that the framework developed for the analysis of poly(aromatic hydrocarbon) properties is useful for the understanding of the corresponding platinum acetylide complexes.
C1 [Cooper, Thomas M.; Krein, Douglas M.; Burke, Aaron R.; McLean, Daniel G.; Haley, Joy E.; Slagle, Jonathan; Monahan, Jennifer] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Krein, Douglas M.; Burke, Aaron R.] Gen Dynam Informat Technol, Dayton, OH 45431 USA.
[McLean, Daniel G.; Slagle, Jonathan] Sci Applicat Int Corp, Dayton, OH 45434 USA.
[Monahan, Jennifer] SOCHE Student Res Program, Dayton, OH 45420 USA.
[Fratini, Albert] Univ Dayton, Dept Chem, Dayton, OH 45469 USA.
RP Cooper, TM (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
FU AFRL/RX [F33615-99-C-5415, F33615-03-D-5408, F33615-03-D-5421]
FX The authors thank Yosadara Ruiz-Morales (Mexican Petroleum Institute)
for teaching us the framework for analyzing poly(aromatic hydrocarbon)
structure property relationships and the referees for useful feedback.
We thank the support of this work by AFRL/RX Contracts F33615-99-C-5415
for D.G.M., F33615-03-D-5408 for D.M.K. and A.R.B., and F33615-03-D-5421
for J.E.S.
NR 49
TC 6
Z9 6
U1 1
U2 14
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1089-5639
J9 J PHYS CHEM A
JI J. Phys. Chem. A
PD JAN 12
PY 2012
VL 116
IS 1
BP 139
EP 149
DI 10.1021/jp203616c
PG 11
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 874SI
UT WOS:000298978000016
PM 22077595
ER
PT J
AU Carlson, PJ
Bose, S
Armstrong, DW
Hawkins, T
Gordon, MS
Petrich, JW
AF Carlson, Philip J.
Bose, Sayantan
Armstrong, Daniel W.
Hawkins, Tommy
Gordon, Mark S.
Petrich, Jacob W.
TI Structure and Dynamics of the 1-Hydroxyethyl-4-amino-1,2,4-triazolium
Nitrate High-Energy Ionic Liquid System
SO JOURNAL OF PHYSICAL CHEMISTRY B
LA English
DT Article
ID MOLECULAR-ORBITAL METHOD; COMPLETE SOLVATION RESPONSE;
ROTATIONAL-DYNAMICS; COUMARIN 153; THEORETICAL INVESTIGATIONS;
PHYSICOCHEMICAL PROPERTIES; ELECTRONIC-STRUCTURE; DIELECTRIC FRICTION;
BASIS-SETS; SPECTROSCOPY
AB An investigation of the structure and dynamics of the high-energy ionic liquid, 1-hydroxyethyl-4-amino-1,2,4-triazolium nitrate (HEATN), was undertaken. Both experimental and computational methods were employed to understand the fundamental properties, characteristics, and behavior of HEATN. The charge separation, according to the electrostatic potential derived charges, was assessed. The MP2 (second-order perturbation theory) geometry optimizations find six dimer and five tetramer structures and allow one to see the significant highly hydrogen bonded network predicted within the HEATN system. Due to the prohibitive scaling of ab initio methods, the fragment molecular orbital (FMO) method was employed and assessed for feasibility with highly energetic ionic liquids using HEATN as a model system. The FMO method was found to adequately treat the HEATN ionic liquid system as evidenced by the small relative error obtained. The experimental studies involved the investigation of the solvation dynamics of the HEATN system via the coumarin 153 (C153) probe at five different temperatures. The rotational dynamics through the HEATN liquid were also measured using C153. Comparisons with previously studied imidazolium and phosphonium ionic liquids show surprising similarity. To the authors' knowledge, this is the first experimental study of solvation dynamics in a triazolium-based ionic liquid.
C1 [Carlson, Philip J.; Bose, Sayantan; Gordon, Mark S.; Petrich, Jacob W.] Iowa State Univ, US Dept Energy Ames Lab, Ames, IA 50011 USA.
[Carlson, Philip J.; Bose, Sayantan; Gordon, Mark S.; Petrich, Jacob W.] Iowa State Univ, Dept Chem, Ames, IA 50011 USA.
[Armstrong, Daniel W.] Univ Texas Arlington, Dept Chem & Biochem, Arlington, TX 76019 USA.
[Hawkins, Tommy] USAF, Res Lab, Edwards AFB, CA 93524 USA.
RP Gordon, MS (reprint author), Iowa State Univ, US Dept Energy Ames Lab, Ames, IA 50011 USA.
EM mark@si.msg.chem.iastate.edu; jwp@iastate.edu
RI Bose, Sayantan/C-2749-2012; Carlson, Philip/J-1533-2014; Petrich,
Jacob/L-1005-2015
FU Air Force Office of Scientific Research; U.S. Department of Energy,
Office of Basic Energy Sciences, Division of Chemical Sciences,
Geosciences, and Bioscience through the Ames Laboratory; U.S. Department
of Energy by Iowa State University [DE-AC02-07CH11358]
FX The authors acknowledge Dr. Gregory Drake, Mr. Michael Tinnirello, Ms.
Leslie Hudgens, and Mr. Spencer Pruitt for many helpful discussion and
guidance. This work was supported by a grant from the Air Force Office
of Scientific Research. S.B. was supported by the U.S. Department of
Energy, Office of Basic Energy Sciences, Division of Chemical Sciences,
Geosciences, and Bioscience through the Ames Laboratory (S.B.). The Ames
Laboratory is operated for the U.S. Department of Energy by Iowa State
University under Contract No. DE-AC02-07CH11358.
NR 87
TC 28
Z9 28
U1 1
U2 18
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 1520-6106
J9 J PHYS CHEM B
JI J. Phys. Chem. B
PD JAN 12
PY 2012
VL 116
IS 1
BP 503
EP 512
DI 10.1021/jp207840q
PG 10
WC Chemistry, Physical
SC Chemistry
GA 874SJ
UT WOS:000298978100059
PM 22126259
ER
PT J
AU Iurov, A
Gumbs, G
Roslyak, O
Huang, DH
AF Iurov, Andrii
Gumbs, Godfrey
Roslyak, Oleksiy
Huang, Danhong
TI Anomalous photon-assisted tunneling in graphene
SO JOURNAL OF PHYSICS-CONDENSED MATTER
LA English
DT Article
AB We investigated the transmission of Dirac electrons through a potential barrier in the presence of circularly polarized light. An anomalous photon-assisted enhanced transmission is predicted and explained. It is demonstrated that the perfect transmission for nearly head-on collision in infinite graphene is suppressed in gapped dressed states of electrons, which is further accompanied by a shift of peaks as a function of the incident angle away from head-on collision. In addition, the perfect transmission is partially suppressed by a photon-induced gap in illuminated graphene. After the effect of rough edges of the potential barrier or impurity scattering is included, the perfect transmission with no potential barrier becomes completely suppressed and the energy range for the photon-assisted transmission is reduced at the same time.
C1 [Iurov, Andrii; Gumbs, Godfrey; Roslyak, Oleksiy] CUNY Hunter Coll, Dept Phys & Astron, New York, NY 10065 USA.
[Gumbs, Godfrey] Donostia Int Phys Ctr DIPC, San Sebastian 20018, Basque Country, Spain.
[Huang, Danhong] USAF, Res Lab, ARFL RVSS, Kirtland AFB, NM 87117 USA.
RP Iurov, A (reprint author), CUNY Hunter Coll, Dept Phys & Astron, 695 Pk Ave, New York, NY 10065 USA.
RI DONOSTIA INTERNATIONAL PHYSICS CTR., DIPC/C-3171-2014
FU AFRL [FA 9453-11-01-0263]; Air Force Office of Scientific Research
(AFOSR)
FX This research was supported by contract # FA 9453-11-01-0263 of the
AFRL. DH would like to thank the Air Force Office of Scientific Research
(AFOSR) for its support.
NR 26
TC 24
Z9 24
U1 0
U2 4
PU IOP PUBLISHING LTD
PI BRISTOL
PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND
SN 0953-8984
EI 1361-648X
J9 J PHYS-CONDENS MAT
JI J. Phys.-Condes. Matter
PD JAN 11
PY 2012
VL 24
IS 1
AR 015303
DI 10.1088/0953-8984/24/1/015303
PG 8
WC Physics, Condensed Matter
SC Physics
GA 868RP
UT WOS:000298542500008
PM 22156167
ER
PT J
AU Guenthner, AJ
Lamison, KR
Vij, V
Reams, JT
Yandek, GR
Mabry, JM
AF Guenthner, Andrew J.
Lamison, Kevin R.
Vij, Vandana
Reams, Josiah T.
Yandek, Gregory R.
Mabry, Joseph M.
TI New Insights into Structure-Property Relationships in Thermosetting
Polymers from Studies of Cocured Polycyanurate Networks
SO MACROMOLECULES
LA English
DT Article
ID CYANATE ESTER RESINS; CROSS-LINK DENSITY; MECHANICAL-PROPERTIES;
TRANSITION-TEMPERATURE; LEAST-SQUARES; COMPOSITES; MOISTURE;
PERFORMANCE; BEHAVIOR
AB Studies of the physical properties of the cocured networks formed from three similar dicyanate ester monomers revealed a number of unexpected variations from simple linear mixing rules. These variations shed light on important synergistic effects in cocured thermosetting networks and their possible causes. The monomers utilized were the dicyanate esters of Bisphenol A (BADCy) and Bisphenol E (LECy) and the silicon-containing analogue of Bisphenol A (SiMCy). The most important of the synergistic effects was a decrease of similar to 25% in moisture uptake seen only in conetworks of LECy and SiMCy. For all other systems, a clear relationship between moisture uptake and the number density of cyanurate rings was observed. This relationship generally applies to many types of cyanate esters and gives an indication of the importance of specific sites (as opposed to free volume alone) in moisture uptake. Numerous additional examples of nonlinear mixing relations were observed in the glass transition temperature, density, and thermochemical stability of fully cured networks. Interestingly, the most widespread deviations from linear behavior were observed for conetworks of SiMCy and LECy, suggesting that factors such as the mismatch in network segment size may be more important than differences in flexibility or symmetry in driving significant physical interactions among conetwork components.
C1 [Guenthner, Andrew J.; Yandek, Gregory R.; Mabry, Joseph M.] USAF, Res Lab, Propuls Directorate, Edwards Afb, CA 93524 USA.
[Lamison, Kevin R.; Vij, Vandana] USAF, Res Lab, ERC Inc, Edwards Afb, CA 93524 USA.
[Reams, Josiah T.] USAF, Res Lab, Natl Res Council, Edwards Afb, CA 93524 USA.
RP Guenthner, AJ (reprint author), USAF, Res Lab, Propuls Directorate, Edwards Afb, CA 93524 USA.
EM andrew.guenthner@edwards.af.mil
FU Air Force Office of Scientific Research; Air Force Research Laboratory;
National Research Council Research
FX Support from the Air Force Office of Scientific Research, the Air Force
Research Laboratory, and the National Research Council Research
Associateship Program (JR) is gratefully acknowledged.
NR 42
TC 20
Z9 20
U1 1
U2 16
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA
SN 0024-9297
J9 MACROMOLECULES
JI Macromolecules
PD JAN 10
PY 2012
VL 45
IS 1
BP 211
EP 220
DI 10.1021/ma202513h
PG 10
WC Polymer Science
SC Polymer Science
GA 873TD
UT WOS:000298905000025
ER
PT J
AU Pulliam, JRC
Epstein, JH
Dushoff, J
Rahman, SA
Bunning, M
Jamaluddin, AA
Hyatt, AD
Field, HE
Dobson, AP
Daszak, P
AF Pulliam, Juliet R. C.
Epstein, Jonathan H.
Dushoff, Jonathan
Rahman, Sohayati A.
Bunning, Michel
Jamaluddin, Aziz A.
Hyatt, Alex D.
Field, Hume E.
Dobson, Andrew P.
Daszak, Peter
CA HERG
TI Agricultural intensification, priming for persistence and the emergence
of Nipah virus: a lethal bat-borne zoonosis
SO JOURNAL OF THE ROYAL SOCIETY INTERFACE
LA English
DT Article
DE Nipah virus; epidemic enhancement; infectious disease dynamics; emerging
pathogens; zoonosis; flying fox
ID PENINSULAR MALAYSIA; PTEROPUS-VAMPYRUS; HENIPAVIRUS INFECTION;
PUBLIC-HEALTH; FRUIT BATS; DISEASES; PARAMYXOVIRUS; TRANSMISSION;
ENCEPHALITIS; BANGLADESH
AB Emerging zoonoses threaten global health, yet the processes by which they emerge are complex and poorly understood. Nipah virus (NiV) is an important threat owing to its broad host and geographical range, high case fatality, potential for human-to-human transmission and lack of effective prevention or therapies. Here, we investigate the origin of the first identified outbreak of NiV encephalitis in Malaysia and Singapore. We analyse data on livestock production from the index site (a commercial pig farm in Malaysia) prior to and during the outbreak, on Malaysian agricultural production, and from surveys of NiV's wildlife reservoir (flying foxes). Our analyses suggest that repeated introduction of NiV from wildlife changed infection dynamics in pigs. Initial viral introduction produced an explosive epizootic that drove itself to extinction but primed the population for enzootic persistence upon reintroduction of the virus. The resultant within-farm persistence permitted regional spread and increased the number of human infections. This study refutes an earlier hypothesis that anomalous El Nino Southern Oscillation-related climatic conditions drove emergence and suggests that priming for persistence drove the emergence of a novel zoonotic pathogen. Thus, we provide empirical evidence for a causative mechanism previously proposed as a precursor to widespread infection with H5N1 avian influenza and other emerging pathogens.
C1 [Epstein, Jonathan H.; Daszak, Peter; HERG] EcoHlth Alliance, New York, NY 10001 USA.
[Pulliam, Juliet R. C.; Dushoff, Jonathan; Dobson, Andrew P.] Princeton Univ, Dept Ecol & Evolutionary Biol, Princeton, NJ 08544 USA.
[Pulliam, Juliet R. C.] NIH, Fogarty Int Ctr, Bethesda, MD 20892 USA.
[Rahman, Sohayati A.] Vet Res Inst, Dept Vet Serv, Ipoh, Perak, Malaysia.
[Rahman, Sohayati A.] Univ Putra Malaysia, Serdang, Selangor, Malaysia.
[Bunning, Michel] USAF, Lackland AFB, San Antonio, TX 78201 USA.
[Jamaluddin, Aziz A.] Minist Agr, Dept Vet Serv, Putrajaya, Malaysia.
[Hyatt, Alex D.] CSIRO, Australian Anim Hlth Lab, Geelong, Vic, Australia.
[Field, Hume E.] Dept Employment Econ Dev & Innovat, Biosecur Sci Lab, Brisbane, Qld, Australia.
RP Daszak, P (reprint author), EcoHlth Alliance, 460 W 34th St,17th Floor, New York, NY 10001 USA.
EM daszak@ecohealthalliance.org
RI Pulliam, Juliet/A-6516-2008
OI Pulliam, Juliet/0000-0003-3314-8223
FU NIH/NSF [R01-TW05869]; Pew Charitable Trusts [2000-002558]; Princeton
University Center for Health and Wellbeing; Science and Technology
Directorate, Department of Homeland Security and Fogarty International
Center, National Institutes of Health
FX P.D. conceived and directed the study; P. D. and J.R.C.P. co-wrote the
paper with assistance from J.H.E.; J.R.C.P. designed and conducted the
modelling and statistical analyses with J.D. and A. P. D., and conducted
all fieldwork related to livestock; J.H.E. and S. A. R. led the bat
survey work, and S. A. R. conducted some of the sample testing. M. B.
collected field data on pig production during the NiV outbreak
investigation. A.A.J. facilitated data acquisition and all field
activities in Malaysia. A. D. H. directed sample testing. H. E. F.
assisted in study design, helped direct field activities and provided
veterinary input. All authors were involved in the design of the study
and the interpretation of the results and commented on the manuscript.
All other HERG authors discussed study design and interpretation of
data. We thank T. Hughes, J. Westrom, Abdul Karim bin Abdul Hamid, Abdul
Nordin bin Harul, Zaini bin Che Mamat, Ong B. L., Lim Y. S., S. P.
Loganathan, Chang K. W., R. Mehendran, C. Smith, Lim B. L., A. A.
Chmura, S. S. Hassan, E. McKenzie, C. Pearson, T. Kunz, T. Ksiazek, A.
Zubaid, S. A. Levin, K. Hampson, P. R. Hosseini and A. M. Kilpatrick. We
also thank the owners and managers of the index farm for their
cooperation. Data for this project were provided by the Director
General, Department of Veterinary Services, Ministry of Agriculture and
Agro-based Industry, Malaysia. Agricultural land-use data have been
provided by the Director General, Soil Resource Management and
Conservation Division, Department of Agriculture, Ministry of
Agriculture and Agro-based Industry, Malaysia. Special permits for
trapping and sampling wild bats were provided by the Department of
Wildlife and National Parks, Malaysia (Perhilitan). This work was
supported primarily by an NIH/NSF Ecology of Infectious Diseases award
(Fogarty International Center R01-TW05869), with additional support from
the Australian Biosecurity Cooperative Research Centre for Emerging
Infectious Diseases (AB-CRC), the Pew Charitable Trusts (grant
2000-002558), a Princeton University Center for Health and Wellbeing
graduate research grant to J. P., a National Science Foundation Graduate
Research Fellowship to J. P. and the Research and Policy for Infectious
Disease Dynamics (RAPIDD) programme of the Science and Technology
Directorate, Department of Homeland Security and Fogarty International
Center, National Institutes of Health. This study used the
high-performance computational capabilities of the Biowulf Linux cluster
at the National Institutes of Health, Bethesda, MD, USA
(http://biowulf.nih.gov).
NR 45
TC 79
Z9 80
U1 1
U2 77
PU ROYAL SOC
PI LONDON
PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND
SN 1742-5689
EI 1742-5662
J9 J R SOC INTERFACE
JI J. R. Soc. Interface
PD JAN 7
PY 2012
VL 9
IS 66
BP 89
EP 101
DI 10.1098/rsif.2011.0223
PG 13
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 852CE
UT WOS:000297322800008
PM 21632614
ER
PT J
AU Pal, C
Cammidge, AN
Cook, MJ
Sosa-Sanchez, JL
Sharma, AK
Ray, AK
AF Pal, C.
Cammidge, A. N.
Cook, M. J.
Sosa-Sanchez, J. L.
Sharma, A. K.
Ray, A. K.
TI In situ chemichromic studies of interactions between a lutetium
bis-octaalkyl-substituted phthalocyanine and selected biological
cofactors
SO JOURNAL OF THE ROYAL SOCIETY INTERFACE
LA English
DT Article
DE lutetium bisphthalocyanine; UV-visible absorption; biomolecules;
chemichromic changes; rate of reduction
ID ELECTROCHROMIC BEHAVIOR; ELECTRICAL-PROPERTIES; ASCORBIC-ACID; FILMS;
BISPHTHALOCYANINE; REDUCTION; COMPLEXES; INSIGHTS; LIQUID; SCURVY
AB Spin-coated films, approximately 100 nm thick, of a newly synthesized bis[octakis(octyl)phthalocyaninato] lutetium(III) complex on ultrasonically cleaned glass substrates exhibit pronounced chemichromic behaviour with potential application in healthcare. In situ kinetic optical absorption spectroscopic measurements show that the phthalocyanine Q-band is red shifted by 60 nm upon oxidation arising from exposure to bromine vapour. Recovery to the original state is achieved by the treatment of the oxidized films with nicotinamide adenine dinucleotide and L-ascorbic acid (vitamin C) in an aqueous solution containing 1.5 M lithium perchlorate. The neutralization process is found to be governed by first-order kinetics. The linear increase of the reduction rate with increasing concentration of cofactors provides a basis for calibration of analyte concentrations ranging from 3.5 mM down to 0.03 mM.
C1 [Pal, C.; Ray, A. K.] Brunel Univ, Wolfson Ctr Mat Proc, Uxbridge UB8 3PH, Middx, England.
[Cammidge, A. N.; Cook, M. J.] Univ E Anglia, Sch Chem, Norwich NR4 7TJ, Norfolk, England.
[Sosa-Sanchez, J. L.] Benemerita Univ Autonoma Puebla, Ctr Invest Dispositivos Semicond, Puebla, Mexico.
[Sharma, A. K.] USAF, Res Lab, Space Vehicles Directorate, Se Kirtland Afb, NM 87117 USA.
RP Ray, AK (reprint author), Brunel Univ, Wolfson Ctr Mat Proc, Uxbridge UB8 3PH, Middx, England.
EM a.cammidge@uea.ac.uk
OI Cammidge, Andrew/0000-0001-7912-4310
FU Air Force Office of Scientific Research, Air Force Material Command,
USAF [FA8655-08-1-3034]; Leverhulme Trust
FX This work is sponsored by the Air Force Office of Scientific Research,
Air Force Material Command, USAF, under grant no. FA8655-08-1-3034. The
authors are grateful to Prof. J. Silver and Prof. R. Withnall of Brunel
University for fruitful discussions. Thanks are also due to Dr Benjamin
J. Jones of the Experimental Techniques Centre at Brunel University for
AFM measurements. Professor Cook thanks the Leverhulme Trust for a
Leverhulme Emeritus Fellowship.
NR 36
TC 7
Z9 7
U1 2
U2 43
PU ROYAL SOC
PI LONDON
PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND
SN 1742-5689
J9 J R SOC INTERFACE
JI J. R. Soc. Interface
PD JAN 7
PY 2012
VL 9
IS 66
BP 183
EP 189
DI 10.1098/rsif.2010.0726
PG 7
WC Multidisciplinary Sciences
SC Science & Technology - Other Topics
GA 852CE
UT WOS:000297322800017
PM 21676969
ER
PT J
AU Tchoul, MN
Dalton, M
Tan, LS
Dong, HC
Hui, CM
Matyjaszewski, K
Vaia, RA
AF Tchoul, Maxim N.
Dalton, Matthew
Tan, Loon-Seng
Dong, Hongchen
Hui, Chin Ming
Matyjaszewski, Krzysztof
Vaia, Richard A.
TI Enhancing the fraction of grafted polystyrene on silica hybrid
nanoparticles
SO POLYMER
LA English
DT Article
DE Polymer nanocomposites; Surface-initiated atom transfer radical;
polymerization; Hairy nanoparticles
ID TRANSFER RADICAL POLYMERIZATION; PARTICLES; SIZE; NANOCOMPOSITES;
TRANSITION; MORPHOLOGY; CONSTANTS; POLYMERS; LIGAND
AB Polymer-grafted inorganic nanoparticles are being developed for a diverse array of applications, ranging from drug delivery to multifunctional composites. In many instances, performance of these core-shell hybrids is limited by relatively broad distributions of size and composition, as well as the presence of impurities, such as unattached polymer chains. Herein, further synthetic improvements, and associated characterization techniques, to enhance the fraction of the grafted polystyrene shell on silica hybrid nanoparticles are discussed. We found that during surface-initiated atom transfer radical polymerization (SI-ATRP) from the silica nanoparticles, thermal self-initiation of styrene produces unattached polymer chains. Size exclusion chromatography afforded a facile approach to quantify the mass of the unattached polymer, and provide a substantial refinement to estimates of chain graft density beyond traditionally-used approaches, such as thermogravimetry. This fraction of unattached polymer is still present even after post-polymerization work-up via precipitation and re-dissolution. Removal necessitates additional procedures, such as high speed centrifugation. Selection of a lower polymerization temperature, in concert with a more reactive Cu complex, significantly reduces the amount of unattached polystyrene impurity. The improved polymerization conditions and post-polymerization purification provide more refined polystyrene-grafted silica nanoparticles to clarify structure-property relationships of these core-shell hybrids. Published by Elsevier Ltd.
C1 [Tchoul, Maxim N.; Dalton, Matthew; Tan, Loon-Seng; Vaia, Richard A.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Dalton, Matthew] Gen Dynam Informat Technol, Dayton, OH 45431 USA.
[Dong, Hongchen; Hui, Chin Ming; Matyjaszewski, Krzysztof] Carnegie Mellon Univ, Dept Chem, Pittsburgh, PA 15213 USA.
RP Vaia, RA (reprint author), USAF, Res Lab, Mat & Mfg Directorate, 2943 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM richard.vaia@wpafb.af.mil
RI Tan, Loon-Seng/F-6985-2012; Matyjaszewski, Krzysztof/A-2508-2008
OI Tan, Loon-Seng/0000-0002-2134-9290; Matyjaszewski,
Krzysztof/0000-0003-1960-3402
FU National Science Foundation (NSF) [DMR 09-69301]; Air Force Office of
Scientific Research [FA-9550-09-1-0169]
FX Financial support for this work was provided by National Science
Foundation (NSF grant #DMR 09-69301) and by the Air Force Office of
Scientific Research (via Contract FA-9550-09-1-0169). This research was
performed while M. Tchoul held a National Research Council Research
Associateship Award at the AFRL.
NR 35
TC 16
Z9 18
U1 2
U2 61
PU ELSEVIER SCI LTD
PI OXFORD
PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND
SN 0032-3861
J9 POLYMER
JI Polymer
PD JAN 5
PY 2012
VL 53
IS 1
BP 79
EP 86
DI 10.1016/j.polymer.2011.11.025
PG 8
WC Polymer Science
SC Polymer Science
GA 889KW
UT WOS:000300073600008
ER
PT J
AU Wellems, LD
Huang, DH
Leskova, TA
Maradudin, AA
AF Wellems, L. David
Huang, Danhong
Leskova, T. A.
Maradudin, A. A.
TI Nanogroove array on thin metallic film as planar lens with tunable
focusing
SO PHYSICS LETTERS A
LA English
DT Article
ID TRANSMISSION; LIGHT
AB Numerical results for the distributions of light transmitted through metallic planar lenses composed of symmetric nanogroove arrays on the surfaces of a gold film are presented and explained. Both the near- and far-field distributions of the intensity of light transmitted are calculated by using a Green's function formalism. Results for an optimal transverse focus based on a quadratic variation of groove width are obtained. Meanwhile, a significant dependence of the focal length on the wavelength of light incident from the air side through the gold film into a dielectric substrate is found for this detector configuration. (C) 2011 Elsevier B.V. All rights reserved.
C1 [Wellems, L. David; Huang, Danhong] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Leskova, T. A.; Maradudin, A. A.] Univ Calif Irvine, Inst Surface & Interface Sci, Irvine, CA 92697 USA.
[Leskova, T. A.; Maradudin, A. A.] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA.
RP Huang, DH (reprint author), USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
EM danhong.huang@kirtland.af.mil
FU Air Force Office of Scientific Research (AFOSR)
FX We would like to thank the Air Force Office of Scientific Research
(AFOSR) for its support.
NR 10
TC 4
Z9 4
U1 1
U2 3
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 0375-9601
EI 1873-2429
J9 PHYS LETT A
JI Phys. Lett. A
PD JAN 2
PY 2012
VL 376
IS 3
BP 216
EP 220
DI 10.1016/j.physleta.2011.11.002
PG 5
WC Physics, Multidisciplinary
SC Physics
GA 890GY
UT WOS:000300134300013
ER
PT J
AU Parasuraman, R
Christensen, J
Grafton, S
AF Parasuraman, Raja
Christensen, James
Grafton, Scott
TI Neuroergonomics: The brain in action and at work
SO NEUROIMAGE
LA English
DT Editorial Material
C1 [Parasuraman, Raja] George Mason Univ, Arch Lab, Fairfax, VA 22030 USA.
[Parasuraman, Raja] George Mason Univ, Dept Psychol, Fairfax, VA 22030 USA.
[Christensen, James] USAF, Res Lab, Dayton, OH 45433 USA.
[Grafton, Scott] Univ Calif Santa Barbara, Dept Psychol & Brain Sci, Santa Barbara, CA 93106 USA.
RP Parasuraman, R (reprint author), George Mason Univ, Arch Lab, Fairfax, VA 22030 USA.
EM rparasur@gmu.edu
OI Christensen, James/0000-0003-4539-5467
NR 16
TC 20
Z9 20
U1 3
U2 14
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 1053-8119
J9 NEUROIMAGE
JI Neuroimage
PD JAN 2
PY 2012
VL 59
IS 1
SI SI
BP 1
EP 3
DI 10.1016/j.neuroimage.2011.08.011
PG 3
WC Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical
Imaging
SC Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging
GA 838CX
UT WOS:000296265500001
PM 21854856
ER
PT J
AU Christensen, JC
Estepp, JR
Wilson, GF
Russell, CA
AF Christensen, James C.
Estepp, Justin R.
Wilson, Glenn F.
Russell, Christopher A.
TI The effects of day-to-day variability of physiological data on operator
functional state classification
SO NEUROIMAGE
LA English
DT Article
DE EEG; Pattern classification; Interday variability; Workload
ID BRAIN-COMPUTER INTERFACES; ADAPTIVE AUTOMATION; NEURAL-NETWORKS; EEG
INDEXES; TASK; FMRI; COMMUNICATION; SELECTION; BCI
AB The application of pattern classification techniques to physiological data has undergone rapid expansion. Tasks as varied as the diagnosis of disease from magnetic resonance images, brain-computer interfaces for the disabled, and the decoding of brain functioning based on electrical activity have been accomplished quite successfully with pattern classification. These classifiers have been further applied in complex cognitive tasks to improve performance, in one example as an input to adaptive automation. In order to produce generalizable results and facilitate the development of practical systems, these techniques should be stable across repeated sessions. This paper describes the application of three popular pattern classification techniques to EEG data obtained from asymptotically trained subjects performing a complex multitask across five days in one month. All three classifiers performed well above chance levels. The performance of all three was significantly negatively impacted by classifying across days; however two modifications are presented that substantially reduce misclassifications. The results demonstrate that with proper methods, pattern classification is stable enough across days and weeks to be a valid, useful approach. Published by Elsevier Inc.
C1 [Christensen, James C.] USAF, Res Lab, Appl Neurosci Branch, Wright Patterson AFB, OH 45433 USA.
[Wilson, Glenn F.] Physiometrex Inc, Keizer, OR 97303 USA.
[Russell, Christopher A.] Archinoetics LLC, Honolulu, HI 96813 USA.
RP Christensen, JC (reprint author), USAF, Res Lab, Appl Neurosci Branch, 711th Human Performance Wing,2255 H St,B248, Wright Patterson AFB, OH 45433 USA.
EM james.christensen@wpafb.af.mil
OI Estepp, Justin/0000-0001-8049-9582; Christensen,
James/0000-0003-4539-5467
NR 42
TC 26
Z9 29
U1 2
U2 12
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 1053-8119
J9 NEUROIMAGE
JI Neuroimage
PD JAN 2
PY 2012
VL 59
IS 1
SI SI
BP 57
EP 63
DI 10.1016/j.neuroimage.2011.07.091
PG 7
WC Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical
Imaging
SC Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging
GA 838CX
UT WOS:000296265500007
PM 21840403
ER
PT J
AU McKinley, RA
Bridges, N
Walters, CM
Nelson, J
AF McKinley, R. Andy
Bridges, Nathaniel
Walters, Craig M.
Nelson, Jeremy
TI Modulating the brain at work using noninvasive transcranial stimulation
SO NEUROIMAGE
LA English
DT Article
DE Neuroergonomics; Noninvasive brain stimulation; Transcranial direct
current stimulation; Transcranial magnetic stimulation; Cognitive
performance; Enhancement; tDCS; TMS; Brain stimulation mechanism
ID HUMAN MOTOR CORTEX; RIGHT PARIETAL CORTEX; MAGNETIC STIMULATION;
PREFRONTAL CORTEX; DECISION-MAKING; CORTICAL NEUROPLASTICITY;
EXCITABILITY CHANGES; DEPRESSED-PATIENTS; HUMANS; RTMS
AB This paper proposes a shift in the way researchers currently view and use transcranial brain stimulation technologies. From a neuroscience perspective, the standard application of both transcranial magnetic stimulation (TMS) and transcranial direct current stimulation (tDCS) has been mainly to explore the function of various brain regions. These tools allow for noninvasive and painless modulation of cortical tissue. In the course of studying the function of an area, many studies often report enhanced performance of a task during or following the stimulation. However, little follow-up research is typically done to further explore these effects. Approaching this growing pool of cognitive neuroscience literature with a neuroergonomics mindset (i.e., studying the brain at work), the possibilities of using these stimulation techniques for more than simply investigating the function of cortical areas become evident. In this paper, we discuss how cognitive neuroscience brain stimulation studies may complement neuroergonomics research on human performance optimization. And, through this discussion, we hope to shift the mindset of viewing transcranial stimulation techniques as solely investigatory basic science tools or possible clinical therapeutic devices to viewing transcranial stimulation techniques as interventional tools to be incorporated in applied science research and systems for the augmentation and enhancement of human operator performance. Published by Elsevier Inc.
C1 [McKinley, R. Andy; Walters, Craig M.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Bridges, Nathaniel] Infoscitex Corp, Dayton, OH 45431 USA.
[Nelson, Jeremy] Tulane Univ, Tulane Neurosci Program, New Orleans, LA 70118 USA.
[Nelson, Jeremy] Booz Allen Hamilton, Dayton, OH 45420 USA.
RP McKinley, RA (reprint author), 2215 1st St Bldg 33, Wright Patterson AFB, OH 45433 USA.
EM andy.mckinley@wpafb.af.mil
RI Westwood, Sam/P-7000-2015
NR 125
TC 28
Z9 28
U1 2
U2 24
PU ACADEMIC PRESS INC ELSEVIER SCIENCE
PI SAN DIEGO
PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
SN 1053-8119
J9 NEUROIMAGE
JI Neuroimage
PD JAN 2
PY 2012
VL 59
IS 1
SI SI
BP 129
EP 137
DI 10.1016/j.neuroimage.2011.07.075
PG 9
WC Neurosciences; Neuroimaging; Radiology, Nuclear Medicine & Medical
Imaging
SC Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging
GA 838CX
UT WOS:000296265500014
PM 21840408
ER
PT J
AU Craig, D
Ruff, D
Hewitson, S
Barnes, J
Amt, J
AF Craig, Desiree
Ruff, Derek
Hewitson, Steve
Barnes, Joel
Amt, John
GP ION
TI The UHARS Non-GPS Based Positioning System
SO PROCEEDINGS OF THE 25TH INTERNATIONAL TECHNICAL MEETING OF THE SATELLITE
DIVISION OF THE INSTITUTE OF NAVIGATION (ION GNSS 2012)
LA English
DT Proceedings Paper
CT 25th International Technical Meeting of the Satellite-Division of the
Institute-of-Navigation
CY SEP 17-21, 2012
CL Nashville, TN
SP Inst Nav, Satellite Div
AB The Ultra High Accuracy Reference System (UHARS) is the 746th Test Squadron's next generation reference system, currently under development to meet test and evaluation reference requirements for future navigation and guidance systems. Consisting of a rack mounted, tightly integrated system of navigation sensors/subsystems, data acquisition system, and a post-mission reference trajectory algorithm, UHARS will provide a highly accurate reference solution for airborne and land-based test vehicles in electronic warfare environments where modernized and legacy GPS signals are jammed from friendly or hostile systems. The system will be appropriately sized and constructed for use on-board multiple test-beds including current and future test aircraft and ground vehicles.
Achieving these accurate reference solutions requires a Non-GPS Based Positioning System (NGBPS) subsystem capable of providing sub-meter position accuracy in a GPS-denied (jamming) environment. The NGBPS portion of the UHARS program plans to employ a network of ground transceivers and test vehicle rover receivers, manufactured by the Locata Corporation. The NGBPS uses Locata's standard commercial transceiver and rover devices, but meeting the demanding UHARS accuracy and distance requirements necessitated major improvement of Locata's normal antennas, amplification and navigational software. To this end, the 746th Test Squadron awarded Locata a contract to re-design these components and demonstrate a system delivering longer ranges (both for acquisition and tracking), higher power transmission levels, new antenna designs for aircraft use, and higher aircraft dynamics than previously envisaged.
The 746th Test Squadron and Locata completed a technical demonstration of this improved capability on October 2011 on White Sands Missile Range. The demonstration (including set-up, flight trials and check-out time) spanned a 3-week period. This paper details the NGBPS demonstration to include the following: technical challenges, conduct details such as flight profiles and ground station set-up, and the results.
C1 [Craig, Desiree] 746th Test Squadron, Holloman AFB, NM USA.
RP Craig, D (reprint author), 746th Test Squadron, Holloman AFB, NM USA.
NR 14
TC 0
Z9 0
U1 0
U2 1
PU INST NAVIGATION
PI WASHINGTON
PA 815 15TH ST NW, STE 832, WASHINGTON, DC 20005 USA
PY 2012
BP 2073
EP 2082
PG 10
WC Remote Sensing
SC Remote Sensing
GA BIA71
UT WOS:000327163302011
ER
PT B
AU Blackshire, JL
AF Blackshire, James L.
GP IEEE
TI Ultrasonic Scattering from Complex Crack Morphology Features
SO 2012 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)
SE IEEE International Ultrasonics Symposium
LA English
DT Proceedings Paper
CT IEEE International Ultrasonics Symposium (IUS)
CY OCT 07-10, 2012
CL Dresden, GERMANY
SP IEEE
DE Ultrasound Scattering; Crack Morphology; Reliable Crack Sizing
AB In a typical ultrasound measurement, only the scattering cross-section features are considered involving the overall crack profile. A realistic crack, however, can have local curvature and sharpness features, which can have an effect on the ultrasonic scattering response and detected signal content. A study of crack morphology effects on ultrasonic scattering in the near-and far-field is described. Finite element models, scanning laser vibrometry, and optical microscopy measurements are used to study ultrasound scattering from realistic cracks in superalloy materials, where three primary length scale effects are considered -1) overall crack profile, 2) local variations in crack profile, and 3) local roughness features. Ultrasonic frequency/wavelength and crack length scale features are considered for both near-field and far-field regions, where direct comparisons of model predictions and experimental measurements are made. Local crack roughness features produced very localized and complex wave scattering effects in the extreme near-field of the crack site, while crack profile variations on the order of, or larger than, the ultrasonic wavelength produced coherent scattered field patterns that diverged, were directional in nature, and extended well into the far-field.
C1 AFRL, RXCA, Wright Patterson AFB, OH 45433 USA.
RP Blackshire, JL (reprint author), AFRL, RXCA, Wright Patterson AFB, OH 45433 USA.
EM James.Blackshire@wpafb.af.mil
NR 10
TC 3
Z9 3
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-4562-0; 978-1-4673-4561-3
J9 IEEE INT ULTRA SYM
PY 2012
BP 248
EP 251
DI 10.1109/ULTSYM.2012.0061
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BHX71
UT WOS:000326960200053
ER
PT S
AU Mukhopadhyay, S
Mitchell, S
AF Mukhopadhyay, Sanjoy
Mitchell, Stephen
BE James, RB
Burger, A
Franks, LA
Fiederle, M
TI Direction sensitive neutron detectors in near field measurements
SO HARD X-RAY, GAMMA-RAY, AND NEUTRON DETECTOR PHYSICS XIV
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT SPIE Conference on Hard X-Ray, Gamma-Ray, and Neutron Detector Physics
XIV
CY AUG 13-15, 2012
CL San Diego, CA
SP SPIE
DE Neutrons; Direction Sensitive; Drop Sensor; MCNP; Occlusion
AB Contrary to situations in which a reactor is compromised, in emergency response situations generally the count rates are low, and neutrons may be scattered around in inhomogeneous intervening materials; in fact, both situations are typical for field operations, including emergency response missions. It is also true that neutron sensors are most efficient for the lowest energy neutrons, so it is not as easy to detect and count energetic neutrons. Most of the emergency response neutron detectors are offshoots of nuclear device diagnostics tools and special nuclear materials characterization equipment, because that is what is available commercially. These instruments mostly are laboratory equipment, and not field-deployable gear suited for mobile teams. Our goal is to design and prototype field-deployable, ruggedized, lightweight, efficient neutron detectors.
Experimental work performed in the area of neutron detector development at the Remote Sensing Laboratory-Andrews Operations (RSL-AO) sponsored by the U.S. Department of Energy, National Nuclear Security Administration (NNSA) in recent months is presented in this article. Ten pressurized He-3 tubes with an inch of annular polyethylene moderator around them are arranged to make an isosceles triangle with three fold symmetry. MCNPX simulation code has been used to obtain the angular response function of the detector array using a bare Cf-252 source. The neutron counts profile shows possibility of determining the angle of a near - field neutron source with adequate angular resolution for emergency response.
The count distributions among the tubes lend themselves to detect the angular position of the neutron source with a good degree of certainty. A fundamental goal in Homeland Security and Defense Application work (HS&DA) and nuclear non-proliferation is to develop sensors that can determine the location of a possibly mobile neutron source. One common approach has been to design sensor arrays that give location dependent, composite signatures. Different configurations of sensors, such as different geometries and materials, resolve signatures differently, and for several commonly-used configurations we will develop empirical mathematical models based on sensor simulations that will resolve neutron source direction at high resolution and that will accurately detect and locate multiple sources. Initial results have shown success, and in this project we will fully develop the empirical models approach to be implemented by in-field sensors to improve detection success, efficiency, and spatial resolution and by designers to optimize future detectors for source localization.
C1 [Mukhopadhyay, Sanjoy] Natl Secur Technol LLC, Remote Sensing Lab Andrews Operat, Andrews Afb, MD 20762 USA.
RP Mukhopadhyay, S (reprint author), Natl Secur Technol LLC, Remote Sensing Lab Andrews Operat, 1783 Arnold Ave, Andrews Afb, MD 20762 USA.
OI Mukhopadhyay, Sanjoy/0000-0002-0319-5005
NR 6
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9224-1
J9 PROC SPIE
PY 2012
VL 8507
AR 85070S
DI 10.1117/12.929975
PG 9
WC Optics; Physics, Particles & Fields
SC Optics; Physics
GA BHT68
UT WOS:000326642600013
ER
PT S
AU Borel, C
Rosario, D
Romano, J
AF Borel, Christoph
Rosario, Dalton
Romano, Joao
BE Shen, SS
Lewis, PE
TI Range-invariant anomaly detection applied to imaging Fourier transform
spectrometry data
SO IMAGING SPECTROMETRY XVII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Imaging Spectrometry XVII
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE Fourier transform spectrometry; temperature-emissivity separation;
anomaly detection
AB This paper describes the end-to-end processing of image Fourier transform spectrometry data taken of surrogate tank targets at Picatinny Arsenal in New Jersey with the long-wave hyper-spectral camera HyperCam from Telops. The first part of the paper discusses the processing from raw data to calibrated radiance and emissivity data. The second part discusses the application of a range-invariant anomaly detection approach to calibrated radiance, emissivity and brightness temperature data for different spatial resolutions and compares it to the Reed-Xiaoli detector.
C1 [Borel, Christoph] US Air Force, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
RP Borel, C (reprint author), US Air Force, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
EM cborel@afit.edu
NR 8
TC 0
Z9 0
U1 2
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9232-6
J9 PROC SPIE
PY 2012
VL 8515
AR 85150J
DI 10.1117/12.930177
PG 12
WC Optics; Imaging Science & Photographic Technology; Spectroscopy
SC Optics; Imaging Science & Photographic Technology; Spectroscopy
GA BHV24
UT WOS:000326729000014
ER
PT J
AU Uchic, M
Groeber, M
Shah, M
Callahan, P
Shiveley, A
Scott, M
Chapman, M
Spowart, J
AF Uchic, Michael
Groeber, Michael
Shah, Megna
Callahan, Patrick
Shiveley, Adam
Scott, Michael
Chapman, Michael
Spowart, Jonathan
BE DeGraef, M
Poulsen, HF
Lewis, A
Simmons, J
Spanos, G
TI An Automated Multi-Modal Serial Sectioning System for Characterization
of Grain-Scale Microstructures in Engineering Materials
SO PROCEEDINGS OF THE 1ST INTERNATIONAL CONFERENCE ON 3D MATERIALS SCIENCE
LA English
DT Proceedings Paper
CT 1st International Conference on 3D Materials Science (3DMS)
CY JUL 08-12, 2012
CL Seven Springs, PA
SP Minerals, Met & Mat Soc (TMS)
DE serial sectioning; 3D microscopy; EBSD; EDS
AB This paper describes the development of a new serial sectioning system that has been designed to collect microstructural, crystallographic, and chemical information from volumes in excess of 1 mm(3). The system integrates a robotic multi-platen mechanical polishing system with a modern SEM that enables the acquisition of multi-modal data-scanning electron images, EBSD and hyperspectral EDS map-at each section. Selected details of the system construction as well as an initial demonstration of the system capabilities are presented.
C1 [Uchic, Michael; Groeber, Michael; Callahan, Patrick; Spowart, Jonathan] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Uchic, M (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
NR 11
TC 2
Z9 2
U1 1
U2 7
PU JOHN WILEY & SONS
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND
BN 978-1-11847-039-8
PY 2012
BP 195
EP 202
PG 8
WC Materials Science, Characterization & Testing
SC Materials Science
GA BGU65
UT WOS:000324176000030
ER
PT S
AU Carlisle, M
Fagin, B
AF Carlisle, Martin
Fagin, Barry
GP IEEE
TI IRONSIDES: DNS With No Single-Packet Denial of Service or Remote Code
Execution Vulnerabilities
SO 2012 IEEE GLOBAL COMMUNICATIONS CONFERENCE (GLOBECOM)
SE IEEE Global Communications Conference
LA English
DT Proceedings Paper
CT IEEE Global Communications Conference (GLOBECOM)
CY DEC 03-07, 2012
CL Anaheim, CA
SP IEEE
DE DNS; computer security; network security; denial of service; remote
execution; buffer overflow
AB We describe the development of IRONSIDES, an implementation of DNS that is provably invulnerable to remote code execution exploits and single-packet denial of service attacks. Our experimental results show it to be over three times as fast as BIND, the most common implementation of DNS.
C1 [Carlisle, Martin; Fagin, Barry] US Air Force Acad, Dept Comp Sci, Usafa, CO USA.
RP Carlisle, M (reprint author), US Air Force Acad, Dept Comp Sci, Usafa, CO USA.
EM martin.carlisle@usafa.edu; barry.fagin@usafa.edu
NR 18
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2334-0983
BN 978-1-4673-0921-9; 978-1-4673-0920-2
J9 IEEE GLOB COMM CONF
PY 2012
BP 839
EP 844
PG 6
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BGD24
UT WOS:000322375101030
ER
PT S
AU Gordnier, RE
Attar, PJ
AF Gordnier, Raymond E.
Attar, Peter J.
GP ASME
TI IMPACT OF FLEXIBILITY ON THE AERODYNAMICS OF AN ASPECT RATIO TWO
MEMBRANE WING
SO PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING,
2012, VOL 1, PTS A AND B, SYMPOSIA
SE ASME Fluids Engineering Division Summer Meeting
LA English
DT Proceedings Paper
CT ASME Fluids Engineering Division Summer Meeting (FEDSM)
CY JUL 08-12, 2012
CL Rio Grande, PR
SP ASME, Fluids Engn Div
ID EQUATIONS
AB Development of an aeroelastic solver with application to flexible membrane wings for micro air vehicles is presented. A high-order (up to 6th order) Navier-Stokes solver is coupled with a geometrically nonlinear p-version Reissner-Mindlin finite element plate model to simulate the highly flexible elastic membrane. An implicit LES approach is employed to compute the mixed laminar/transitional/turbulent flowfields present for the low Reynolds number flows associated with micro air vehicles. Computations are performed for an aspect ratio two membrane wing at angles of attack alpha = 10 degrees, 16 degrees and 23 degrees for a Reynolds number, Re = 24,300. Comparisons of the computational results with experimental PIV and surface deflection measurements demonstrated reasonable agreement. Reduced separation and enhanced lift are obtained due to favorable interactions between the flexible membrane wing and the unsteady flow over the wing. The impact of flexibility on the aerodynamic performance comes primarily from the development of mean camber with some further effects arising from the interaction between the dynamic motion of the membrane and the unsteady flowfield above. At lower angles of attack this lift enhancement comes at the cost of reduced LID. The nose-down pitching moment increases with flexibility at the lowest angle of attack but is reduced for the higher two angles of attack. These results suggest that membrane flexibility might provide a means to reduce the impact of strong gust encounter by maintaining lift and reducing the effect of the gust on pitching moment.
C1 [Gordnier, Raymond E.] Air Force Res Lab, Air Vehicles Directorate, Computat Sci Branch, Wright Patterson AFB, OH 45433 USA.
RP Gordnier, RE (reprint author), Air Force Res Lab, Air Vehicles Directorate, Computat Sci Branch, Wright Patterson AFB, OH 45433 USA.
EM raymond.gordnier@wpafb.af.mil; peter.attar@ou.edu
NR 28
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
SN 1093-4928
BN 978-0-7918-4475-5
J9 ASME FLUID ENG DIV
PY 2012
BP 1481
EP 1496
PG 16
WC Engineering, Mechanical; Transportation Science & Technology
SC Engineering; Transportation
GA BGX48
UT WOS:000324506700168
ER
PT S
AU Garmann, DJ
Visbal, MR
Orkwis, PD
AF Garmann, Daniel J.
Visbal, Miguel R.
Orkwis, Paul D.
GP ASME
TI NUMERICAL INVESTIGATION OF THE THREE-DIMENSIONAL FLOW STRUCTURE ABOUT A
REVOLVING WING
SO PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING,
2012, VOL 1, PTS A AND B, SYMPOSIA
SE ASME Fluids Engineering Division Summer Meeting
LA English
DT Proceedings Paper
CT ASME Fluids Engineering Division Summer Meeting (FEDSM)
CY JUL 08-12, 2012
CL Rio Grande, PR
SP ASME, Fluids Engn Div
ID LARGE-EDDY SIMULATION; LOW REYNOLDS-NUMBERS; INSECT FLIGHT;
AERODYNAMICS; BUMBLEBEES; MECHANICS; EQUATIONS; ROTATION; SCHEMES; GRIDS
AB A numerical study is conducted to examine the vortex structure about a revolving wing in quiescent flow employing a high-fidelity, implicit large eddy simulation (ILES) technique found to be effective in simulating flows that exhibit interspersed regions of laminar, transitional, and turbulent flows. The revolving wing configuration consists of a single, aspect ratio one rectangular plate extended out a distance of 0.5 chords from the origin. Shortly after the onset of the motion, the rotating wing generates a stable and coherent vortex system across the leading edge and wing root that remains throughout the motion. The aerodynamic loads are also analyzed and found to remain mostly constant during the maneuver Transitional effects on the vortex system are investigated over a range of Reynolds numbers (3,000 < Re < 15, 000). It is found that higher Reynolds numbers promote more breakdown of the leading edge and root vortices, but do not alter the stability of the vortex system. The aerodynamic loads also show little sensitivity to Reynolds number with the higher Reynolds numbers producing only moderately higher forces. Comparisons with recent experimental PIV measurements using a PIV-like data reduction technique applied to the computational solution show very favorable agreement with the mid-span velocity and vorticity contours.
C1 [Garmann, Daniel J.; Visbal, Miguel R.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Garmann, DJ (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Daniel.Garmann@wpafb.af.mil; Miguel.Visbal@wpafb.af.mil;
Paul.Orkwis@uc.edu
NR 46
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
SN 1093-4928
BN 978-0-7918-4475-5
J9 ASME FLUID ENG DIV
PY 2012
BP 1581
EP 1592
PG 12
WC Engineering, Mechanical; Transportation Science & Technology
SC Engineering; Transportation
GA BGX48
UT WOS:000324506700178
ER
PT S
AU Visbal, MR
Garmann, DJ
AF Visbal, Miguel R.
Garmann, Daniel J.
GP ASME
TI FLOW STRUCTURE ABOVE STATIONARY AND OSCILLATING LOW-ASPECT-RATIO WING
SO PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING,
2012, VOL 1, PTS A AND B, SYMPOSIA
SE ASME Fluids Engineering Division Summer Meeting
LA English
DT Proceedings Paper
CT ASME Fluids Engineering Division Summer Meeting (FEDSM)
CY JUL 08-12, 2012
CL Rio Grande, PR
SP ASME, Fluids Engn Div
ID LARGE-EDDY SIMULATION; REYNOLDS-NUMBER AERODYNAMICS; FINITE-DIFFERENCE
SCHEMES; PITCHING AIRFOIL; DYNAMIC STALL; FLAT-PLATE; PREDICTION; MESHES
AB Computations have been carried out in order to describe the complex unsteady flow structure over a stationary and plunging aspect-ratio-two wing under low Reynolds number conditions (Re-c = 10(4)). The flow fields are computed employing a high-fidelity implicit large-eddy simulation (ILES) approach found to be effective for moderate Reynolds number flows exhibiting mixed laminar, transitional and turbulent regions. The evolution of the flow structure and aerodynamic loading as a function of increasing angle of attack is presented. Lift and pressure fluctuations are found to be primarily dominated by the large scale circulatory pattern established above the wing due to separation from the leading edge, and by the inherent three dimensionality of the flow induced by the finite aspect ratio. The spanwise distribution of the sectional lift coefficient revealed only a minor direct contribution to the loading exherted by the tip vortex. High-frequency, small-amplitude oscillations are shown to have a significant effect on the separation process and accompanying loads suggesting potential flow control through either suitable actuation or aero-elastic tailoring.
C1 [Visbal, Miguel R.; Garmann, Daniel J.] Air Force Res Lab, Computat Sci Branch, Wright Patterson AFB, OH 45433 USA.
RP Visbal, MR (reprint author), Air Force Res Lab, Computat Sci Branch, Wright Patterson AFB, OH 45433 USA.
EM miguel.visbal@wpafb.af.mil; daniel.garmann@wpafb.af.mil
NR 47
TC 2
Z9 2
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
SN 1093-4928
BN 978-0-7918-4475-5
J9 ASME FLUID ENG DIV
PY 2012
BP 1593
EP 1605
PG 13
WC Engineering, Mechanical; Transportation Science & Technology
SC Engineering; Transportation
GA BGX48
UT WOS:000324506700179
ER
PT B
AU Christensen, MB
Wirthlin, JR
AF Christensen, Matthew B.
Wirthlin, J. Robert
GP ASME
TI A METHOD FOR MEASURING PROGRAMMATIC DEPENDENCY AND INTERDEPENDENCY
BETWEEN DOD ACQUISITION PROGRAMS
SO PROCEEDINGS OF THE ASME INTERNATIONAL DESIGN ENGINEERING TECHNICAL
CONFERENCES AND COMPUTERS AND INFORMATION IN ENGINEERING CONFERENCE, VOL
5
LA English
DT Proceedings Paper
CT ASME International Design Engineering Technical Conferences and
Computers and Information in Engineering Conference
CY AUG 12-15, 2012
CL Chicago, IL
SP ASME, Design Engn Div, ASME, Comp & Informat Engn Div
AB Large and complex enterprises that are primarily involved in product development and design often must manage their development portfolios against a backdrop of competing demands and realities. Given an existing product development process, there is currently no accepted method for quantitative measurement of development program interdependency. While some methods exist for measuring dependency or interdependency at the component or system level, these methods do not translate well to program interdependency This paper presents a model for measuring program interdependency accurately and measurement. development quantitatively.
The model uses four Interdependency Factors to identify dependency relationships between programs. Specific Interdependency Levels are then used to measure the strengths of those dependencies. The model also accounts for measurement of dependencies upon programs that are not directly connected, i.e., programs that have a degree of separation from another program, and measurement of program criticality, or the extent to which a program is depended-upon by another program.
In this paper, a small portion of the US Air Force's product development portfolio is examined and used to demonstrate these measures. The measurement model is applied to an example development program to measure program dependency characteristics. The results demonstrate that the model can be effectively used to identify and measure program dependencies. The model gives the program manager a quantitative tool to determine how much a program depends upon other programs and the potential impacts of those dependencies. With this information, program. managers can better protect their programs from vulnerabilities associated with interdependency effects from other programs and portfolio managers are given new insights into the management of their portfolio in the product development processes of the enterprise.
C1 [Christensen, Matthew B.] US Air Force, Colorado Springs, CO USA.
RP Christensen, MB (reprint author), US Air Force, Colorado Springs, CO USA.
NR 17
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4504-2
PY 2012
BP 673
EP 686
PG 14
WC Engineering, Manufacturing; Engineering, Mechanical; Nanoscience &
Nanotechnology
SC Engineering; Science & Technology - Other Topics
GA BGX49
UT WOS:000324506900076
ER
PT B
AU Glavin, NR
Hunter, CN
Check, M
Turner, D
Fisher, TS
AF Glavin, Nicholas R.
Hunter, Chad N.
Check, Michael
Turner, David
Fisher, Timothy S.
GP ASME
TI CORRELATION OF ELECTROCHEMICAL IMPEDANCE TO POOL BOILING BEHAVIOR ON
COPPER
SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS
AND EXPOSITION, 2011, VOL 1
LA English
DT Proceedings Paper
CT ASME International Mechanical Engineering Congress and Exposition
(IMECE)
CY NOV 11-17, 2011
CL Denver, CO
SP Amer Soc Mech Engn
ID LIQUID-SOLID CONTACT; CRITICAL HEAT-FLUX; MULTIPHASE FLOWS; ORIENTATION;
MODEL; CHF
AB Pool boiling studies were performed on roughened copper in a dilute saline solution while incorporating a three electrode electrochemical monitoring system. Electrochemical impedance at a frequency of 1000 Hz was monitored during nucleate boiling and through the transition point from nucleate to film boiling. During nucleate boiling, a steady increase in impedance was observed as the solid-vapor contact area increased. Impedance monitoring lead to the discovery of a critical impedance vector magnitude (vertical bar Z vertical bar) between the range of 1.85 k Omega-cm(2) and 2.35 k Omega-cm(2) where critical heat flux was most likely to occur. At the critical point just after nucleate boiling and beginning transition film boiling, an impedance vector magnitude spike was observed from approximately 2 k Omega-cm(2) to 100 k Omega-cm(2), due to the formation of a current impeding vapor layer encompassing the substrate surface. A phase angle decrease at this boiling regime transition point from -2.25 degrees to -30 degrees provides insight into a change in electrochemical circuit phenomena from a purely resistive to a somewhat capacitive electrochemical system.
C1 [Glavin, Nicholas R.; Hunter, Chad N.] Air Force Res Lab, Thermal Sci & Mat Branch, Wright Patterson AFB, OH 45433 USA.
RP Glavin, NR (reprint author), Air Force Res Lab, Thermal Sci & Mat Branch, Wright Patterson AFB, OH 45433 USA.
NR 20
TC 0
Z9 0
U1 0
U2 2
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5487-7
PY 2012
BP 839
EP 844
PG 6
WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical
SC Engineering; Energy & Fuels
GA BHD13
UT WOS:000325040500094
ER
PT B
AU Miller, ES
Patnaik, SS
Jog, MA
AF Miller, Eric S.
Patnaik, Soumya S.
Jog, Milind A.
GP ASME
TI DYNAMIC MODELING OF VAPOR COMPRESSION CYCLES USING A NOVEL LAGRANGIAN
APPROACH
SO PROCEEDINGS OF THE ASME SUMMER HEAT TRANSFER CONFERENCE, 2012, VOL 2
LA English
DT Proceedings Paper
CT ASME Summer Heat Transfer Conference (SHTC)
CY JUL 08-12, 2012
CL Rio Grande, PR
SP ASME, Heat Transfer Div
ID MOVING-BOUNDARY; SYSTEMS
AB Vapor compression cycles-based systems (VCS) are being adapted for thermal management of modern aircraft. Predicting dynamic behavior is critical to the design and control of these systems, which are likely to experience large dynamic changes in heat load. To meet this demand, a novel Lagrangian method to model the dynamic behavior of vapor compression cycles has been developed. The approach described in this paper considers the basic VCS as 4 fluid sides: one high pressure and one low pressure refrigerant side and external fluids which interact with each respectively. Sides are further divided into some number of material volumes. The model simulates compressible, unsteady flow by allowing each volume to translate and displace other elements, expanding and contracting in response to changes in mass, enthalpy and pressure. At every timestep, heat transfer to each mass element is determined and corresponding changes in thermodynamic properties are evaluated. The model predicts transient system response during normal operation as well as startup mode. Results from a dynamic evaporator simulation are presented and discussed. These results show the lowpressure refrigerant and external fluid response to changes in valve position, external fluid inlet temperature, and refrigerant inlet enthalpy. The conclusion drawn from these results is that the modeling framework described in this paper can reproduce the basic dynamics of a two-phase heat exchanger at a rate less than real time.
C1 [Miller, Eric S.; Patnaik, Soumya S.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Jog, MA (reprint author), Univ Cincinnati, Sch Dynam Syst, Cincinnati, OH 45222 USA.
EM Milind.Jog@uc.edu
NR 13
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4478-6
PY 2012
BP 1023
EP 1032
PG 10
WC Engineering, Mechanical
SC Engineering
GA BHC50
UT WOS:000324956800115
ER
PT J
AU Maybury, MT
AF Maybury, Mark T.
BE Tortora, G
Levialdi, S
Tucci, M
TI Usable Advanced Visual Interfaces in Aviation
SO PROCEEDINGS OF THE INTERNATIONAL WORKING CONFERENCE ON ADVANCED VISUAL
INTERFACES
LA English
DT Proceedings Paper
CT International Working Conference on Advanced Visual Interfaces (AVI)
CY MAY 21-25, 2012
CL ITALY
DE Usability; aviation; ground control stations; remotely piloted aircraft;
autonomy; control; learnability; interoperability; instrumentation;
tailored interaction
AB Aviation systems represent a rich, difficult, and critical environment for usability. The life critical importance of aviation systems complemented by with their complexity and the diversity and uncertainty of environments in which they operate, place them necessarily on the avant-guard of usability. We describe the broad range of aviation missions, operators, and operating environments and relate these to key dimensions of usability and visual interfaces. We illustrate this concretely with two case examples: ground control stations for remotely piloted aircraft and air traffic management systems. We explore how in both these cases advances in machine autonomy and human control promise to enhance operator situational awareness and control, however, not without challenges. We share guidelines to ensure effective usability to include: require usability as a key performance parameter, architect and design systems and operations that incorporate affordances and fault tolerance, employ standards to increase learnability and interoperability, instrument environments to tailor usability, and assess effects (Maybury 2012). Finally, remaining challenges and future directions are discussed.
C1 US Air Force, Washington, DC 20330 USA.
RP Maybury, MT (reprint author), US Air Force, Washington, DC 20330 USA.
EM mark.maybury@pentagon.af.mil
NR 2
TC 0
Z9 0
U1 0
U2 0
PU ASSOC COMPUTING MACHINERY
PI NEW YORK
PA 1515 BROADWAY, NEW YORK, NY 10036-9998 USA
BN 978-1-4503-1287-5
PY 2012
BP 2
EP 3
DI 10.1145/2254556.2254558
PG 2
WC Computer Science, Cybernetics; Computer Science, Software Engineering
SC Computer Science
GA BGJ28
UT WOS:000323214900001
ER
PT S
AU Hopkins, FK
Diggs, DE
AF Hopkins, F. Kenneth
Diggs, Darnell E.
BE Taylor, EW
Cardimona, DA
TI Enabling an All-Guided-Wave Mid-IR Laser Source
SO NANOPHOTONICS AND MACROPHOTONICS FOR SPACE ENVIRONMENTS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanophotonics and Macrophotonics for Space Environments VI
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE lasers; nonlinear optics; mid-infrared
ID WAVEGUIDES
AB An all guided-wave multi-spectral laser source emitting watts to tens-of-watts of mid-infrared power would impact a broad range of airborne and space applications. As compared with a free-space solid-state laser source, a guided-wave design, composed of coupled lasing and nonlinear optical components, offers potential advantages in size, weight, efficiency, and mechanical robustness while retaining high beam quality for single-mode designs. New material options under development by the Materials and Manufacturing Directorate of the Air Force Research Laboratory (AFRL) enable new approaches to achieving such a source.
C1 [Hopkins, F. Kenneth; Diggs, Darnell E.] Air Force Res Lab AFRL RXAP, Wright Patterson AFB, OH 45433 USA.
RP Hopkins, FK (reprint author), Air Force Res Lab AFRL RXAP, 3005 Hobson Way, Wright Patterson AFB, OH 45433 USA.
NR 8
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9236-4
J9 PROC SPIE
PY 2012
VL 8519
AR 851908
DI 10.1117/12.929853
PG 4
WC Nanoscience & Nanotechnology; Optics; Physics, Applied
SC Science & Technology - Other Topics; Optics; Physics
GA BHG04
UT WOS:000325297900005
ER
PT S
AU Ouchen, F
Joyce, DM
Venkat, N
Smith, SR
Subramanyam, G
Taylor, E
Grote, JG
AF Ouchen, Fahima
Joyce, Donna M.
Venkat, Narayanan
Smith, Steven R.
Subramanyam, Guru
Taylor, Edward
Grote, James G.
BE Taylor, EW
Cardimona, DA
TI Biopolymer-based dielectric materials for space environments
SO NANOPHOTONICS AND MACROPHOTONICS FOR SPACE ENVIRONMENTS VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanophotonics and Macrophotonics for Space Environments VI
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
AB The potential of bio-dielectrics for space applications was explored using deoxyribonucleic acid (DNA)-based biopolymers. Un-doped DNA, as well as titanium dioxide (TiO2) nanoparticle (rutile form)-doped DNA were processed and evaluated. Characterized parameters were temperature stability, resistivity, dielectric constant, dielectric loss and radiation tolerance. The dielectric constant and dielectric loss of un-doped DNA and TiO2-doped DNA were measured for both pre- and post-exposure to approximately 100 krad Gamma-ray radiation. There was little change in the dielectric constant and dielectric loss of the un-doped DNA sample with exposure to radiation. However, there was a significant reduction in the dielectric constant of the TiO2-doped DNA sample.
C1 [Ouchen, Fahima; Joyce, Donna M.; Venkat, Narayanan; Smith, Steven R.; Grote, James G.] US Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Ouchen, F (reprint author), US Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 11
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9236-4
J9 PROC SPIE
PY 2012
VL 8519
AR 85190L
DI 10.1117/12.942153
PG 5
WC Nanoscience & Nanotechnology; Optics; Physics, Applied
SC Science & Technology - Other Topics; Optics; Physics
GA BHG04
UT WOS:000325297900016
ER
PT B
AU Sutter, TM
Dickerson, MB
Creasy, TS
Baur, JW
Justice, RS
AF Sutter, Thomas M.
Dickerson, Matthew B.
Creasy, Terry S.
Baur, Jeffery W.
Justice, Ryan S.
GP ASME
TI DEVELOPMENT OF LOCALIZED, LIGHT-WEIGHT PRESSURIZATION MECHANISMS:
APPROACH, FEASIBILITY, AND IMPACT
SO PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE
STRUCTURES AND INTELLIGENT SYSTEMS, VOL 2
LA English
DT Proceedings Paper
CT ASME Conference on Smart Materials, Adaptive Structures and Intelligent
Systems
CY SEP 19-21, 2012
CL Stone Mountain, GA
SP ASME, Gen Motors, Parker Hannifin, Dynalloy Inc, Teledyne Sci & Imag, IOP Publish, Sage Publish, NextGen Aeronaut, Natl Sci Fdn, Air Force Off Sci Res
ID GLUCOSE-OXIDASE; MEMORY; SHAPE; COMPOSITES; ENZYME; DESIGN; SMA
AB This work presents a novel gas-generation mechanism designed to enable bioinspired actuators. Specifically, the fundamental aspects involved in harnessing the gaseous products from biologically catalyzed reactions and recycling the gases into an actuation pressurization scheme are explored. The capability of having such a self-regulating, self-regenerating system of gas generation could provide the necessary pneumatically-driven force to enable devices that require localized pressurization, such as rubber muscle actuators. This work reports 1) the utilization of biological systems to produce gaseous products that will ultimately affect actuator density in situ, and 2) the construction of a freely moving power rig to monitor rubber muscle actuator performance under pressure generated from biologically powered reactions.
C1 [Sutter, Thomas M.] Univ Dayton, Res Inst, Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
RP Sutter, TM (reprint author), Univ Dayton, Res Inst, Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH USA.
NR 24
TC 0
Z9 0
U1 0
U2 2
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4510-3
PY 2012
BP 621
EP 626
PG 6
WC Engineering, Mechanical; Materials Science, Multidisciplinary; Materials
Science, Biomaterials
SC Engineering; Materials Science
GA BGX46
UT WOS:000324504300075
ER
PT S
AU Jackovitz, K
Asari, V
Balster, E
Vasquez, J
Hytla, P
AF Jackovitz, Kevin
Asari, Vijayan
Balster, Eric
Vasquez, Juan
Hytla, Patrick
GP IEEE
TI Registration of Region of Interest for Object Tracking Applications in
Wide Area Motion Imagery
SO 2012 IEEE APPLIED IMAGERY PATTERN RECOGNITION WORKSHOP (AIPR)
SE IEEE Applied Imagery Pattern Recognition Workshop
LA English
DT Proceedings Paper
CT IEEE Applied Imagery Pattern Recognition Workshop (AIPR)
CY OCT 09-11, 2012
CL Washington, DC
SP IEEE
DE Computer Vision; Image Processing; Wide Area Motion Imagery; Image
Registration/Stabilization; Template Tracking
ID OPTICAL-FLOW
AB Image registration or stabilization is a task that has been focused on in many fields in image processing. Many methods are available for registering two images, but when dealing with wide area motion imagery, registration of the full scene can be taxing computationally. The proposed algorithm is an application utilizing two existing registration methods to stabilize a specific region of interest in an aerial image database. The registration tools implemented during this application are a phase correlation method and the efficient second- order minimization method. The combination of both registration functions act as a coarse- to- fine image registration algorithm. The goal of this application is to output a set of registered smaller sized images from the larger dataset for the use in detection and tracking of objects in wide area imagery. Experiments performed on several image streams show that the proposed technique is effective and gives high registration accuracy.
C1 [Jackovitz, Kevin; Asari, Vijayan; Balster, Eric] Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
[Vasquez, Juan] Air Force Res Lab, Wright Patterson AFB, OH USA.
[Hytla, Patrick] Univ Dayton, Res Inst, Dayton, OH USA.
RP Jackovitz, K (reprint author), Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
NR 18
TC 0
Z9 0
U1 2
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1550-5219
BN 978-1-4673-4558-3; 978-1-4673-4556-9
J9 IEEE APP IMG PAT
PY 2012
PG 8
WC Computer Science, Artificial Intelligence; Engineering, Electrical &
Electronic
SC Computer Science; Engineering
GA BGV67
UT WOS:000324312300014
ER
PT S
AU Sakla, W
AF Sakla, Wesam
GP IEEE
TI Action Classification in Polarimetric Infrared Imagery via Diffusion
Maps
SO 2012 IEEE APPLIED IMAGERY PATTERN RECOGNITION WORKSHOP (AIPR)
SE IEEE Applied Imagery Pattern Recognition Workshop
LA English
DT Proceedings Paper
CT IEEE Applied Imagery Pattern Recognition Workshop (AIPR)
CY OCT 09-11, 2012
CL Washington, DC
SP IEEE
DE dimensionality reduction; classification; polarimetric; infrared;
manifold learning; diffusion maps
ID DIMENSIONALITY REDUCTION; FRAMEWORK
AB This work explores the application of a nonlinear dimensionality reduction technique known as diffusion maps for performing action classification in polarimetric infrared video sequences. The diffusion maps algorithm has been used successfully in a variety of applications involving the extraction of low-dimensional embeddings from high-dimensional data. Our dataset is composed of eight subjects each performing three basic actions: walking, walking while carrying an object in one hand, and running. The actions were captured with a polarized microgrid sensor operating in the longwave portion of the electromagnetic (EM) spectrum with a temporal resolution of 24 Hz, yielding the Stokes traditional intensity (S-0) and linearly polarized (S-1, S-2) components of data. Our work includes the use of diffusion maps as an unsupervised dimensionality reduction step prior to action classification with three conventional classifiers: the linear perceptron algorithm, the k nearest neighbors (KNN) algorithm, and the kernel-based support vector machine (SVM). We present classification results using both the low-dimensional principal components via PCA and the low-dimensional diffusion map embedding coordinates of the data for each class. Results indicate that the diffusion map lower-dimensional embeddings provide a salient feature space for action classification, yielding an increase of overall classification accuracy by similar to 40% compared to PCA. Additionally, we examine the utility that the polarimetric sensor may provide by concurrently performing these analyses in the polarimetric feature spaces.
C1 Air Force Res Lab, Sensors Directorate, Layered Sensing Exploitat Div, Wright Patterson AFB, OH USA.
RP Sakla, W (reprint author), Air Force Res Lab, Sensors Directorate, Layered Sensing Exploitat Div, Wright Patterson AFB, OH USA.
NR 25
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1550-5219
BN 978-1-4673-4558-3
J9 IEEE APP IMG PAT
PY 2012
PG 8
WC Computer Science, Artificial Intelligence; Engineering, Electrical &
Electronic
SC Computer Science; Engineering
GA BGV67
UT WOS:000324312300030
ER
PT S
AU Ferendeci, AM
Ewing, RL
AF Ferendeci, Altan M.
Ewing, Robert L.
GP IEEE
TI Rectangular Cavity High Harmonic Maser Amplifier
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc, IEEE Dayton Sect
DE components; Gyrotron; maser; axially grooved waveguide; harmonic
frequencies; magnetic field
AB A maser amplifier operating at the higher harmonics of the cyclotron frequency is presented. Detailed study of the performance has already been done incorporating an axially slotted rectangular waveguide and the study is now concentrated on the detailed experimental construction of the unit. The present harmonic maser also known as a gyrotron will be initially experimentally demonstrated and verified at the X-band frequencies. The goal is using the experience gained from the lower frequency operation is to design, construct and demonstrate a rectangular high harmonic maser amplifier at the W-band frequencies.
C1 [Ferendeci, Altan M.] ElectroMagnetSyst, Cincinnati, OH USA.
[Ewing, Robert L.] USAF, AFRL RYMDA, Dayton, OH USA.
RP Ferendeci, AM (reprint author), ElectroMagnetSyst, Cincinnati, OH USA.
EM ems@electromagneticsystems.com; Robert.Ewing@wpafb.af.mil
FU AFSOR
FX This work was supported by AFSOR.
NR 4
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3; 978-1-4673-2791-6
J9 PROC NAECON IEEE NAT
PY 2012
BP 75
EP 77
PG 3
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100019
ER
PT S
AU Posey, NA
Wu, T
Wolff, M
Zumberge, J
AF Posey, Nathaniel A.
Wu, Thomas
Wolff, Mitch
Zumberge, Jon
GP IEEE
TI Modeling and Control Scheme Design of a Solenoid-Actuated Fuel Injection
System
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc, IEEE Dayton Sect
AB This paper demonstrates the viability of frequency modulation of discrete voltage pulses via feedback loops as a means of control for an electronically actuated fuel injection system. Specifically, this study targets the effectiveness of such control with regards to the Hydraulically actuated Electronically controlled Unit Injector (HEUI). A more accurate model for electromechanical actuator (EMA) using solenoid has been implemented together with models of other subsystems. Significant improvements have been made to the existing MATLAB/Simulink modeling approach in order to implement a higher degree of system control.
C1 [Posey, Nathaniel A.] Columbia Univ, New York, NY 10027 USA.
[Wu, Thomas] Univ Cent Florida, Orlando, FL 32816 USA.
[Zumberge, Jon] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Posey, NA (reprint author), Columbia Univ, New York, NY 10027 USA.
NR 6
TC 1
Z9 1
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3; 978-1-4673-2791-6
J9 PROC NAECON IEEE NAT
PY 2012
BP 92
EP 95
PG 4
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100022
ER
PT S
AU Ramirez, J
Mendoza-Schrock, O
AF Ramirez, Juan, Jr.
Mendoza-Schrock, Olga
GP IEEE
TI Diffusion Maps for Exploring Electro-Optical Synthetic Vehicle Image
Data
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc, IEEE Dayton Sect
ID NONLINEAR DIMENSIONALITY REDUCTION; EIGENMAPS
AB In this work, we explore low-dimensional representations of high-dimensional data derived from electro-optical synthetic vehicle images. The collection of vehicle images consists of four different vehicle models: Toyota Camry, Toyota Avalon, Toyota Tacoma, and Nissan Sentra. This data contains 3,601 160 x 213 gray-scale vehicle images sampled uniformly over a camera view hemisphere. We use the non-linear manifold learning technique of diffusion maps with Gaussian kernel to explore low-dimensional structure the high-dimensional cloud of vehicle image observations. Diffusion maps have been shown to be a valuable tool in the analysis of high-dimensional data and the technique is able to extract an approximation for the underlying structure inherent to the data. Our analysis includes examining how the diffusion time and kernel width leads to different low-dimensional representations and we present a novel technique to relate the kernel width to the distribution of data in the observation space. In addition, we present initial results for multi-class vehicle classification through low-dimensional embedding coordinates and the out-of-sample extension of unlabeled vehicle images.
C1 [Ramirez, Juan, Jr.] Univ Colorado, Dept Elect Comp & Energy Engn, Boulder, CO 80309 USA.
[Mendoza-Schrock, Olga] US Air Force Res Lab, Wright Patterson AFB, OH USA.
RP Ramirez, J (reprint author), Univ Colorado, Dept Elect Comp & Energy Engn, Boulder, CO 80309 USA.
NR 15
TC 1
Z9 1
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3; 978-1-4673-2791-6
J9 PROC NAECON IEEE NAT
PY 2012
BP 126
EP 133
PG 8
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100029
ER
PT S
AU McCoppin, R
Rizki, M
Tamburino, L
Freeman, A
Mendoza-Schrock, O
AF McCoppin, Ryan
Rizki, Mateen
Tamburino, Louis
Freeman, Andrew
Mendoza-Schrock, Olga
GP IEEE
TI The Effects of Clothing on Gender Classification using LIDAR Data
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc, IEEE Dayton Sect
DE gender classification; LIDAR point cloud; feature selection;
evolutionary computation
AB In this paper we describe preliminary efforts to extend previous gender classification experiments using feature histograms extracted from 3D point clouds of human subjects. The previous experiments used point clouds drawn from the Civilian American and European Surface Anthropometry Project (CAESAR anthropometric database provided by the Air Force Research Laboratory (AFRL) Human Effectiveness Directorate and SAE International). This database contains approximately 4,400 high-resolution LIDAR whole body scans of carefully posed human subjects. Features are extracted from each point cloud by embedding the cloud in series of cylindrical shapes and computing a point count for each cylinder that characterizes a region of the subject. These measurements define rotationally invariant histogram features that are processed by a classifier to label the gender of each subject. The recognition results with the tightly control CAESAR database reached levels of over 90% accuracy. A smaller secondary point cloud data set was generated at Wright State University to allow experimentation on clothed subjects that was not possible with the CAESAR data. We present the preliminary results for the transition of classification software using different combinations of training and tests sets taken from both the CAESAR and clothed subject data sets. As expected, the accuracy achieved with clothed subjects fell short of the earlier experiments using only the CAESAR data. Nevertheless, the new results provide new insights for more robust classification algorithms.
C1 [McCoppin, Ryan; Rizki, Mateen; Tamburino, Louis] Wright State Univ, Dept Comp Sci & Engn, Dayton, OH 45435 USA.
[Freeman, Andrew; Mendoza-Schrock, Olga] Air Force Res Lab, Sensor Directorate, Wright Patterson AFB, OH USA.
RP McCoppin, R (reprint author), Wright State Univ, Dept Comp Sci & Engn, Dayton, OH 45435 USA.
FU ATR Center Grant [FA8650-07-D-1220-0005]
FX The authors would like to thank Mr. Huaining Cheng at the Air Force
Research Laboratory (AFRL)/Human Effectiveness Directorate for his
assistance with the CAESAR database and his support of this effort. They
would also like to thank Mr. Ed Zelnio, Director of the ATR Center for
his support of this work via an ATR Center Grant FA8650-07-D-1220-0005.
Finally we would like to acknowledge the contribution of Aaron Fouts for
his assistance with the Fouts' database. (This document is approved for
public release via 88 ABW-2012-5183.)
NR 8
TC 2
Z9 2
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3; 978-1-4673-2791-6
J9 PROC NAECON IEEE NAT
PY 2012
BP 134
EP 139
PG 6
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100030
ER
PT S
AU Price, RL
Ramirez, J
Rovito, TV
Mendoza-Schrock, O
AF Price, Rebecca L.
Ramirez, Juan, Jr.
Rovito, Todd V.
Mendoza-Schrock, Olga
GP IEEE
TI Electro-Optical Synthetic Civilian Vehicle Data Domes
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc (AESS), IEEE Dayton Sect
DE synthetic data; civilian vehicle models; data domesBlender; LuxRender;
Python; pattern recogntion; open-source
AB This paper will look at using open source tools (Blender, LuxRender, and Python) to generate a large data set to be used to train an object recognition system. The model produces camera position, camera attitude, and synthetic camera data that can be used for exploitation purposes. We focus on electro-optical (EO) visible sensors to simplify the rendering but this work could be extended to use other rendering tools that support different modalities. The key idea of this paper is to provide an architecture to produce synthetic training data which is modular in design and constructed on open-source off-the-shelf software yielding a physics accurate virtual model of the object we want to recognize. For this paper the objects we are focused on are civilian vehicles. This architecture shows how leveraging existing open-source software allows for practical training of Electro-Optical object recognition algorithms
C1 [Price, Rebecca L.; Ramirez, Juan, Jr.; Rovito, Todd V.; Mendoza-Schrock, Olga] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Price, RL (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 3
TC 3
Z9 3
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3
J9 PROC NAECON IEEE NAT
PY 2012
BP 140
EP 143
PG 4
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100031
ER
PT S
AU Hytla, PC
Jackovitz, KS
Balster, EJ
Vasquez, JR
Talbert, ML
AF Hytla, Patrick C.
Jackovitz, Kevin S.
Balster, Eric J.
Vasquez, Juan R.
Talbert, Michael L.
GP IEEE
TI Detection and Tracking Performance with Compressed Wide Area Motion
Imagery
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc, IEEE Dayton Sect
DE target tracking; target detection; compression; JPEG2000; Persistent
surveillance; remote sensing; wide area motion imagery
AB The current generation of digital sensor platforms used in remote sensing and surveillance provide a wealth of wide area motion imagery (WAMI). WAMI is employed in a variety of applications, including target detection and tracking. However, airborne platform limitations require that WAMI must be compressed to be effectively transmitted and stored. One standard image compression coding system commonly employed with WAMI data is JPEG2000. In order to meet platform and application requirements, JPEG2000 is often used in lossy mode and at high compression rates, leading to serious image degradation. This work studies the effects of image compression on the performance of the Air Force Research Laboratory's (AFRL) Government Algorithms for Tracking Exploitation Research (GATER) tracking algorithm at compression rates of 10:1 to 80:1. Additionally, several image enhancement algorithms widely available in literature, including Contrast-Limited Adaptive Histogram Equalization (CLAHE), High Frequency Boosting and Multiple Scale Retinex (MSR) and a novel approach titled Locally Tuned Sine Nonlinearity (LTSN) are applied to the imagery prior to compression in an effort to improve tracking performance.
Results indicate the GATER tracking algorithm is measurably resistant to the effects of image compression up to 40:1 compression. At higher compression ratios, the algorithm is still able to detect the moving objects, however, false alarms become the most performance limiting factor. The enhancement algorithms performance is scene dependant; in some cases boosting overall performance and in other cases showing measurable performance degradation.
C1 [Hytla, Patrick C.] Univ Dayton, Res Inst, Sensor Syst Div, Dayton, OH 45469 USA.
[Jackovitz, Kevin S.; Balster, Eric J.] Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
[Vasquez, Juan R.; Talbert, Michael L.] US Air Force, Layered Sensing Exploitat Div, Dayton, OH USA.
RP Hytla, PC (reprint author), Univ Dayton, Res Inst, Sensor Syst Div, Dayton, OH 45469 USA.
EM Patrick.Hytla@udri.udayton.edu
FU Air Force Research Laboratory [FA8650-10-2-7028]
FX This research was funded by the Air Force Research Laboratory under
contract no. FA8650-10-2-7028
NR 10
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U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3; 978-1-4673-2791-6
J9 PROC NAECON IEEE NAT
PY 2012
BP 163
EP 170
PG 8
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100036
ER
PT S
AU Derriso, MM
McCurry, CD
DeSimio, MP
AF Derriso, Mark M.
McCurry, Charles D.
DeSimio, Martin P.
GP IEEE
TI Global Workspace Theory Inspired Architecture for Autonomous Structural
Health Monitoring
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc, IEEE Dayton Sect
DE structural health monitoring; intelligent agent; AFGROW; artificial
nueral networks
AB Structural health monitoring (SHM) systems provide automated assessments of structural health by processing data from sensors fastened to a structure. Most SHM research is focused on developing quick state assessments (i.e., reflexive techniques) using a form of pattern recognition. However, little attention has been given to developing a more 'thoughtful,' logic-based method for state assessments to enable operational-level decisions. Reflexive-based assessments are unreliable because they often cannot discriminate between changes due to structural damage and other variants (e. g., temperature). A new architecture is being proposed that combines reflexive and deliberative elements for enhanced state assessments and operational decisions. The architecture is demonstrated in the laboratory using a representative airframe component.
C1 [Derriso, Mark M.] Air Vehicles Directorate, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[McCurry, Charles D.] Booz Allen Hamilton, Dayton, OH 45420 USA.
[DeSimio, Martin P.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
RP Derriso, MM (reprint author), Air Vehicles Directorate, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
FU AFOSR's Multi-Scale Structural Mechanics and Prognosis Program
FX A portion of this work was supported by a grant from AFOSRs Multi-Scale
Structural Mechanics and Prognosis Program. The authors are grateful to
Todd Bussey of Sierra Lobo for his expertise in instrumentation and data
acquisition.
NR 6
TC 1
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U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3; 978-1-4673-2791-6
J9 PROC NAECON IEEE NAT
PY 2012
BP 190
EP 195
PG 6
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100041
ER
PT S
AU O'Connor, AC
Ilin, R
Ternovskiy, I
AF O'Connor, Alan C.
Ilin, Roman
Ternovskiy, Igor
GP IEEE
TI Detection and tracking of Near-Earth Objects using a cognitive
hierarchical data-association model
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc (AESS), IEEE Dayton Sect
DE track-before-detect; image processing; machine learning; cognitive
models; asteroids
ID SURVEY SIMULATIONS; MOVING TARGETS; SPACE
AB Current efforts aimed at detecting and identifying Near-Earth Objects (NEOs) that pose potential risks to Earth use moderate-size telescopes combined with image processing algorithms to detect the motion of these objects. The search strategies of such systems involve multiple revisits at given intervals between observations to the same area of the sky so that objects that appear to move between the observations can be identified against the static star field. The algorithm described in this paper, referred to as Dynamic Logic (DL), has been applied previously to radar signal processing to achieve a track-before-detect capability. This suggests that DL could improve the detection of extremely dim moving objects in image data as well. The concept of hierarchical dynamic logic is used to supervise image pre-processing and interpret and detect moving objects directly from star-field. The proposed method shows a promising ability to distinguish true asteroid tracks from false alarms with almost no operator interaction, making it potentially suitable for the task of automatic detection of NEOs.
C1 [O'Connor, Alan C.; Ilin, Roman; Ternovskiy, Igor] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP O'Connor, AC (reprint author), Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM alan.c.oconnor@gmail.com; roman.ilin@wpafb.af.mil;
igor.ternovskiy@wpafb.af.mil
NR 19
TC 0
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U1 1
U2 3
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3
J9 PROC NAECON IEEE NAT
PY 2012
BP 196
EP 203
PG 8
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100042
ER
PT S
AU Walter, DJ
Bryan, K
Stephens, J
Bullmaster, C
Chakravarthy, V
AF Walter, D. J.
Bryan, K.
Stephens, James
Bullmaster, Cliff
Chakravarthy, Vasu
GP IEEE
TI Localization of RF Emitters using Compressed Sensing with Multiple
Cooperative Sensors
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc, IEEE Dayton Sect
DE Geolocation; compressed sensing; passive direction finding; cooperative
localization scheme
AB Small unmanned aerial vehicles (UAVs) have limits on the weight and size of direction finding (DF) systems that can be used. However, by employing multiple sensors that work cooperatively, simple DF systems need only to provide a rough estimate of the signal's angle of arrival (AOA) and received signal strength (RSS). As the UAVs move, a plurality of data points can be obtained from diverse locations. Combining this information from multiple sensor locations can provide a low-cost and effective solution to electronic emitter location problems, using low-accuracy DF technology. In this paper we present an algorithm, based on the compressed sensing technique, that uses AOA and RSS from mobile sensors (UAVs) to geolocate the source of radio signals on the ground.
C1 [Walter, D. J.] Rose Hulman Inst Technol, Dept Elect & Comp Engn, Terre Haute, IN 47803 USA.
[Bryan, K.] Rose Hulman Inst Technol, Dept Math, Terre Haute, IN USA.
[Stephens, James; Bullmaster, Cliff; Chakravarthy, Vasu] US Air Force, Res Lab, Dayton, OH USA.
RP Walter, DJ (reprint author), Rose Hulman Inst Technol, Dept Elect & Comp Engn, Terre Haute, IN 47803 USA.
FU Air Force Office of Scientific Research; Summer Faculty Fellowship
Program [FA9550-09-C-0114]; Air Force Research Laboratory
FX This work is supported by Air Force Office of Scientific Research,
Summer Faculty Fellowship Program, Grant No. FA9550-09-C-0114, and the
Air Force Research Laboratory.
NR 11
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3; 978-1-4673-2791-6
J9 PROC NAECON IEEE NAT
PY 2012
BP 236
EP 240
PG 5
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100047
ER
PT S
AU Jameson, B
Garmatyuk, D
Morton, YTJ
Ewing, R
AF Jameson, Brian
Garmatyuk, Dmitriy
Morton, Y. T. Jade
Ewing, Robert
GP IEEE
TI Doorway Identification and Classification Using Software-Defined UWB
OFDM Radar
SO PROCEEDINGS OF THE 2012 IEEE NATIONAL AEROSPACE AND ELECTRONICS
CONFERENCE (NAECON)
SE IEEE National Aerospace and Electronics Conference
LA English
DT Proceedings Paper
CT IEEE National Aerospace and Electronics Conference (NAECON)
CY JUL 25-27, 2012
CL Dayton, OH
SP IEEE, IEEE Aerosp & Elect Syst Soc, IEEE Dayton Sect
ID SYSTEM
AB This paper discusses the implementation of a set of functions that will allow a software-defined ultra-wideband (UWB) orthogonal frequency division multiplexing (OFDM) system to perform short-range indoor navigation. Specifically, we aim to illustrate the effectiveness of the software-defined radar system (SDRS) at identifying the presence of targets and doorways. Simulation results have been generated to demonstrate the levels of precision that are possible in identifying the location and width of doors from the enclosed indoor environment. These results are augmented with experimental results that form the back-end of an experimental implementation.
C1 [Jameson, Brian; Garmatyuk, Dmitriy; Morton, Y. T. Jade] Miami Univ, Dept Elect & Comp Engn, Oxford, OH 45056 USA.
[Ewing, Robert] AFRL, RYMD, Dayton, OH USA.
RP Jameson, B (reprint author), Miami Univ, Dept Elect & Comp Engn, Oxford, OH 45056 USA.
EM jamesobd@muohio.edu; garmatd@muohio.edu; mortonyt@muohio.edu;
Robert.Ewing@wpafb.mil
FU Dayton Area Graduate Studies Institute (DAGSI) [RY17-MU-11-1]
FX This work was partially supported by the Dayton Area Graduate Studies
Institute (DAGSI) Grant RY17-MU-11-1.
NR 8
TC 1
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U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0547-3578
BN 978-1-4673-2792-3; 978-1-4673-2791-6
J9 PROC NAECON IEEE NAT
PY 2012
BP 250
EP 254
PG 5
WC Engineering, Aerospace; Engineering, Electrical & Electronic
SC Engineering
GA BGY50
UT WOS:000324589100050
ER
PT B
AU Hunter, CN
Glavin, NR
Voevodin, AA
Turner, DB
Check, MH
Putnam, SA
Fisher, TS
AF Hunter, Chad N.
Glavin, Nicholas R.
Voevodin, Andrey A.
Turner, David B.
Check, Michael H.
Putnam, Shawn A.
Fisher, Timothy S.
GP ASME
TI EFFECTS OF UV-VISIBLE IRRADIATION ON POOL BOILING BEHAVIOR OF COPPER
SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS
AND EXPOSITION, 2011, VOL 10, PTS A AND B
LA English
DT Proceedings Paper
CT ASME International Mechanical Engineering Congress and Exposition
(IMECE)
CY NOV 11-17, 2011
CL Denver, CO
SP Amer Soc Mech Engn
ID SURFACE TEMPERATURE FLUCTUATIONS; HEAT-TRANSFER; NATURAL-CONVECTION;
SUPERHYDROPHOBICITY; FABRICATION; ELECTRON; FILMS
AB Roughened copper substrates were exposed to a broadband UV VIS light source during nucleate boiling at a heat flux of 60-70% of the amount expected to result in critical heat flux (CHF) without exposure to a light source. The surface temperature decreased by 0.5-1.0 degrees C within minutes after the UV-VIS light exposure began. CHF occurred after less than 20 minutes of exposure to the light source. Nanoscale features were observed in the light-exposed region of the copper surface after boiling, which were primarily associated with formation of Cu2O. The induced CHF likely occurred due to surface oxide formation, a resultant decrease in wettability of the surface.
C1 [Hunter, Chad N.; Glavin, Nicholas R.; Voevodin, Andrey A.] Air Force Res Lab, Thermal Sci & Mat Branch, Wright Patterson AFB, OH USA.
RP Hunter, CN (reprint author), Air Force Res Lab, Thermal Sci & Mat Branch, Wright Patterson AFB, OH USA.
NR 28
TC 0
Z9 0
U1 0
U2 2
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5496-9
PY 2012
BP 503
EP 510
PG 8
WC Engineering, Mechanical
SC Engineering
GA BGZ59
UT WOS:000324716800064
ER
PT B
AU Tseng, CC
Sikorski, RL
Viskanta, R
Chen, MY
AF Tseng, Charles C.
Sikorski, Ruth L.
Viskanta, R.
Chen, Ming Y.
GP ASME
TI EFFECT OF RADIATION ON HEAT TRANSFER IN OPEN-CELL FOAMS AT HIGH
TEMPERATURE
SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS
AND EXPOSITION, 2011, VOL 10, PTS A AND B
LA English
DT Proceedings Paper
CT ASME International Mechanical Engineering Congress and Exposition
(IMECE)
CY NOV 11-17, 2011
CL Denver, CO
SP Amer Soc Mech Engn
ID THERMAL-CONDUCTIVITY; INSULATION
AB There are a variety of foams that can be used in thermal protection and/or thermal insulation systems. At high. temperature (> 1000 K) thermal radiation may be important or dominate heat transfer in the foam; however,: dies baked on more detailed thermal radiation analysis are limited. In this paper foams are considered to be semitransparent, because radiation can penetrate through the pore (or void) space and/or foam skeleton (solid matrix), depending on the materials from which the foams are made. Of particular interest of this study is to understand how the properties such as foam material its density, porosity, etc. affect thermal and radiant energy transfer. Physical and mathematical models are developed to account for conduction and radiation (absorption, emission and scattering) in the porous material. The spectral extinction coefficients of SiC foams are measured experimentally in the laboratory at room temperature, and the radiative transfer equation is solved using the spherical harmonics P-1 and the Rosseland diffusion approximations. Parametric calculations have been carried out, and the results are reported in the paper for a range of parameters characterizing heat transfer in SiC foams of different porosities to identify desirable conditions for effectively reducing heat transfer in potential thermal protection concepts.
C1 [Tseng, Charles C.; Chen, Ming Y.] AFRL RXBC, Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Tseng, CC (reprint author), AFRL RXBC, Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM Ming-Yung.Chen@wpafb.af.mil
NR 24
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5496-9
PY 2012
BP 1067
EP 1076
PG 10
WC Engineering, Mechanical
SC Engineering
GA BGZ59
UT WOS:000324716800127
ER
PT B
AU Shamberger, PJ
Forero, DE
AF Shamberger, Patrick J.
Forero, Daniel E.
GP ASME
TI TOWARDS HIGH ENERGY DENSITY, HIGH CONDUCTIVITY THERMAL ENERGY STORAGE
COMPOSITES
SO PROCEEDINGS OF THE ASME MICRO/NANOSCALE HEAT AND MASS TRANSFER
INTERNATIONAL CONFERENCE, 2012
LA English
DT Proceedings Paper
CT 3rd ASME Micro/Nanoscale Heat and Mass Transfer International Conference
(MNHMT2012)
CY MAR 03-06, 2012
CL Georgia Tech Global Learn Ctr, Atlanta, GA
SP ASME, Nanotechnol Inst, ASME, Heat Transfer Div, Georgia Inst Technol, Natl Sci Fdn, Off Naval Res
HO Georgia Tech Global Learn Ctr
DE Thermal Energy Storage; Composite; Salt Hydrate; Graphitic Foam
ID NUCLEATION; NITRATES; LIKASITE; COPPER; SYSTEM
AB Thermal energy storage (TES) materials absorb transient pulses of heat, allowing for rapid storage of low-quality thermal energy for later use, and effective temperature regulation as part of a thermal management system. This paper describes recent development of salt hydrate-based TES composites at the Air Force Research Laboratory. Salt hydrates are known to be susceptible to undercooling and chemical segregation, and their bulk thermal conductivities remain too low for rapid heat transfer. Here, we discuss recent progress towards solving these challenges in the composite system lithium nitrate trihydrate/graphitic foam. This system takes advantage of both the high volumetric thermal energy storage density of lithium nitrate trihydrate and the high thermal conductivity of graphitic foams. We demonstrate a new stable nucleation agent specific to lithium nitrate trihydrate which decreases undercooling by up to similar to 70% relative to previously described nucleation agents. Furthermore, we demonstrate the compatibility of lithium nitrate trihydrate and graphitic foam with the addition of a commercial nonionic silicone polyether surfactant. Finally, we show that thermal conductivity across water-graphite interfaces is optimized by tuning the surfactant concentration. These advances demonstrate a promising route to synthesizing high energy density, high thermal conductivity TES composites.
C1 [Shamberger, Patrick J.; Forero, Daniel E.] Air Force Res Lab, Thermal Sci & Mat Branch, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Shamberger, PJ (reprint author), Air Force Res Lab, Thermal Sci & Mat Branch, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RI Shamberger, Patrick/C-4795-2014
OI Shamberger, Patrick/0000-0002-8737-6064
NR 29
TC 0
Z9 0
U1 1
U2 3
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5477-8
PY 2012
BP 545
EP 553
PG 9
WC Engineering, Mechanical; Nanoscience & Nanotechnology
SC Engineering; Science & Technology - Other Topics
GA BGW23
UT WOS:000324346800068
ER
PT J
AU Rosenberger, AH
Buchanan, DJ
Ward, DA
Jha, SK
AF Rosenberger, Andrew H.
Buchanan, Dennis J.
Ward, D'Anthony A.
Jha, Sushant K.
BE Huron, ES
Reed, RC
Hardy, MC
Mills, MJ
Montero, RE
Portella, PD
Telesman, J
TI THE VARIABILITY OF FATIGUE IN NOTCHED BARS OF IN100
SO SUPERALLOYS 2012
LA English
DT Proceedings Paper
CT 12th International Symposium on Superalloys
CY SEP 09-13, 2012
CL Seven Springs, PA
SP TMS
DE Notch Fatigue; IN100; Small Crack Growth
ID PREDICTION
AB IN100 is one of the workhorse nickel-base superalloys of the current fleet of turbine engines owned and operated by the US Air Force. Many of the life-limited locations on fracture critical IN100 components are associated with locations of stress concentrations, e. g. bolt holes, fillets, balance flange scallops, etc. The prior work by Jha, Caton, and others [1-3] examining the fatigue variability of nickel-base superalloys found a link between the minimum fatigue life and fracture mechanics. That is, the minimum fatigue life was predicted assuming immediate crack initiation and growth of a small crack. This prior work only examined the fatigue behavior of smooth fatigue bars. The current effort determined that the link between minimum fatigue life and fracture mechanics is applicable even when only a small volume of the material at the root of a notch is subject to the high stress conditions.
C1 [Rosenberger, Andrew H.] Air Force Res Lab, Mat & Mfg Directorate, AFRL RXLMN, 2230 10th St, Wright Patterson AFB, OH 45433 USA.
[Buchanan, Dennis J.] Univ Dayton, Res Inst, Dayton, OH 45469 USA.
[Ward, D'Anthony A.] Southern Ohio Council Higher Educ, Dayton, OH 45420 USA.
[Jha, Sushant K.] Universal Technol Corp, Dayton, OH 45432 USA.
RP Rosenberger, AH (reprint author), Air Force Res Lab, Mat & Mfg Directorate, AFRL RXLMN, 2230 10th St, Wright Patterson AFB, OH 45433 USA.
FU USAF FY10 Section 219 Venture Fund
FX This work was performed at the Air Force Research Laboratory, Materials
and Manufacturing Directorate, Wright-Patterson Air Force Base, OH. The
partial financial support from the USAF FY10 Section 219 Venture Fund is
gratefully acknowledged. SKJ acknowledges essential support provided by
the Air Force Office of Scientific Research (AFOSR) LRIR Task 11RX01COR
with Dr. David Stargel as the program manager. The authors also wish to
acknowledge Dr. Reji John, Dr. Robert Brockman and Mr. Peter Phillips
for their helpful technical discussions and assistance with the stress
intensity factor calculations and ABAQUS modeling.
NR 16
TC 2
Z9 2
U1 0
U2 1
PU JOHN WILEY & SONS
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND
BN 978-0-470-94320-5
PY 2012
BP 143
EP 148
PG 6
WC Metallurgy & Metallurgical Engineering
SC Metallurgy & Metallurgical Engineering
GA BGX57
UT WOS:000324518300016
ER
PT J
AU Viswanathan, GB
Bain, K
Huber, D
Jha, S
Sam, S
Tiley, J
Woodward, C
Fraser, HL
AF Viswanathan, G. B.
Bain, Ken
Huber, Dan
Jha, S.
Sam, S.
Tiley, J.
Woodward, Christopher
Fraser, H. L.
BE Huron, ES
Reed, RC
Hardy, MC
Mills, MJ
Montero, RE
Portella, PD
Telesman, J
TI ANALYSIS OF DEFORMATION SUBSTRUCTURES IN A NOTCHED LCF SAMPLE UNDER
DWELL CONDITION IN A Ni-BASED SUPERALLOY
SO SUPERALLOYS 2012
LA English
DT Proceedings Paper
CT 12th International Symposium on Superalloys
CY SEP 09-13, 2012
CL Seven Springs, PA
SP TMS
DE transmission electron microscopy; dislocations; deformation; low cycle
fatigue; dwell-fatigue; superalloy
ID CREEP; FATIGUE; MECHANISMS; NI3AL
AB Detailed transmission electron microscopy (TEM) studies were conducted on low cycle fatigue (LCF) sample of Rene 104 alloy samples tested under dwell conditions to analyze the deformation substructures. Specifically, the focus was to investigate the effect of crack length, in other words, stress intensity factor range Delta E, on the deformation substructures. Thin foils were prepared by focused ion beam method (FIB) from two specific grains along the crack path at varying distances representing varying Delta E values. The TEM analysis indicated that the character of deformation substructures significantly differed in these two grains. It is therefore speculated that local stress conditions and the grain orientations played a key role in the damage accumulation and subsequent substructure evolution. The regions below the fracture surface were also investigated. Detailed scanning electron microscopy (SEM) investigations of the grains immediately below the fracture surface revealed extensive microstructure degradation and potential hot spots for crack nucleation.
C1 [Viswanathan, G. B.; Jha, S.; Tiley, J.; Woodward, Christopher] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Bain, Ken] GE Aviat, Cincinnati, OH 45215 USA.
[Huber, Dan; Sam, S.; Fraser, H. L.] Ohio State Univ, Dept Mat Sci & Engn, Columbus, OH 43210 USA.
RP Viswanathan, GB (reprint author), Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
FU AFRL Hybrid Disk Program; Center for Accelerated Maturation of Materials
(CAMM) at The Ohio State University
FX The authors acknowledge funding from the AFRL Hybrid Disk Program and
the support of D. Hardwick and insightful discussions with Mike Mills
and Patrick Philips. The authors also acknowledge the support received
from the Center for Accelerated Maturation of Materials (CAMM) at The
Ohio State University for this research.
NR 20
TC 0
Z9 0
U1 0
U2 1
PU JOHN WILEY & SONS
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND
BN 978-0-470-94320-5
PY 2012
BP 403
EP 409
PG 7
WC Metallurgy & Metallurgical Engineering
SC Metallurgy & Metallurgical Engineering
GA BGX57
UT WOS:000324518300044
ER
PT J
AU Woodward, C
Lill, J
Asta, M
Trinkle, DR
AF Woodward, Christopher
Lill, James
Asta, Mark
Trinkle, Dallas R.
BE Huron, ES
Reed, RC
Hardy, MC
Mills, MJ
Montero, RE
Portella, PD
Telesman, J
TI MOLECULAR-DYNAMICS SIMULATIONS OF MOLTEN NI-BASED SUPERALLOYS
SO SUPERALLOYS 2012
LA English
DT Proceedings Paper
CT 12th International Symposium on Superalloys
CY SEP 09-13, 2012
CL Seven Springs, PA
SP TMS
DE Density Functional Theory; Liquid metal; Density; Molar volume;
Diffusion
ID AUGMENTED-WAVE METHOD; LIQUID NI; TRANSPORT-PROPERTIES; ATOMIC
DIFFUSION; BINARY-ALLOYS; ENERGY; PSEUDOPOTENTIALS; DENSITY
AB Fundamental parameters of liquid metal alloys are calculated using a first principles approach, based on Density Functional Theory (DFT), with the goal of informing models of defect formation during solidification processing. Ab-initio molecular dynamic simulations (AIMD) are applied to liquid metal alloys ranging from simple metals to Rene-N4 and CMSX-4 to predict molar volumes (density), diffusion rates and local ordering. These include elemental Ni, Ni-5.4X, Ni-20X, and Ni-10Al-2.8X (X= W, Re, and Ta) (at%) alloys at 1750 and 1830 K. Calculated kinetics and the atomic distribution in the liquids indicate that simulations of 500 atoms run for approximately 7 ps converge the time-averaged properties, including molar volume. Overall diffusion rates and molar volumes are in good agreement with available experimental measurements, though the AIMD predictions appear to systematically underestimate thermal expansion. The method is then used to predict density inversion in three additional alloys, Ni-14Al-3W, CMSX-4 and Rene-N4 for temperatures and compositions expected in the mushy zone during directional solidification. Density inversion is predicted for these three alloys based on density and density contrast in the mushy zone, the prediction and ranking of the effect is consistent with previous studies. Predictions for molar volume are compared with the recent parameterization of molar volumes using extensive measurements of binary alloys. AIMD calculations validate the underlying assumptions of these models and illustrate the bounds in alloy chemistry for applying such techniques.
C1 [Woodward, Christopher] Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Lill, James] High Performance Technol Inc, Wright Patterson AFB, OH 45433 USA.
[Asta, Mark] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
[Trinkle, Dallas R.] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
RP Woodward, C (reprint author), Air Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
FU DoD High Performance Computing Modernization Program at the Air Force
Research Laboratory DoD Supercomputing Research Center AFRL-DSRC; Air
Force Office of Scientific Research under the Materials Engineering for
Affordable New Systems (MEANS-II) program
FX This research was supported in part by a grant of computer time from the
DoD High Performance Computing Modernization Program at the Air Force
Research Laboratory DoD Supercomputing Research Center AFRL-DSRC. MA and
DRT were supported in part with a grant from the Air Force Office of
Scientific Research under the Materials Engineering for Affordable New
Systems (MEANS-II) program. The authors gratefully acknowledge
insightful discussions with T. Pollock, P. Voorhees, J. Miller, O.
Senkov, and S.H. Davis, and the technical assistance provided by S.
Kajihara at the AFRLDSRC.
NR 26
TC 0
Z9 0
U1 0
U2 3
PU JOHN WILEY & SONS
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND
BN 978-0-470-94320-5
PY 2012
BP 537
EP 545
PG 9
WC Metallurgy & Metallurgical Engineering
SC Metallurgy & Metallurgical Engineering
GA BGX57
UT WOS:000324518300059
ER
PT J
AU Turner, TJ
Shade, PA
Schuren, J
Groeber, MA
Miller, M
Uchic, MD
AF Turner, T. J.
Shade, P. A.
Schuren, J.
Groeber, M. A.
Miller, M.
Uchic, M. D.
BE Huron, ES
Reed, RC
Hardy, MC
Mills, MJ
Montero, RE
Portella, PD
Telesman, J
TI TWO INTEGRATED EXPERIMENTAL AND MODELING APPROACHES TO STUDY STRAIN
DISTRIBUTIONS IN NICKEL AND NICKEL-BASE SUPERALLOY POLYCRYSTALS
SO SUPERALLOYS 2012
LA English
DT Proceedings Paper
CT 12th International Symposium on Superalloys
CY SEP 09-13, 2012
CL Seven Springs, PA
SP TMS
DE Crystal-Plasticity; Synchrotron; X-Ray Diffraction; Digital Image
Correlation; Lattice Strain
ID CHANNEL DIE COMPRESSION; LOCALIZED DEFORMATION; CRYSTALLINE SOLIDS;
SINGLE-CRYSTALS; TEXTURE; SIMULATIONS; ALUMINUM; PLASTICITY; DEPENDENCE;
EVOLUTION
AB This work presents two integrated experimental and modeling approaches for examining polycrystals at different length scales, which utilize different experimental techniques but the same elasto-crystal plasticity based finite element model (CPFEM). The goal of this work is to calibrate modeling approaches through experimental data, and then use the models to gain insight into the mechanics of deformation in nickel and nickel-base superalloy polycrystals. The first study utilized a micro-tensile test specimen of pure nickel with 259 grains, where the CPFEM simulations were initiated with the explicit 3D microstructure as measured with 3D-Electron Back Scattering Detection (EBSD) serial sectioning and compared with surface deformations measured with Digital Image Correlation (DIC). The second study utilized a larger polycrystalline nickel-base superalloy specimen with approximately 50,000 grains, where the CPFEM simulation results are compared with lattice strain data obtained through high energy x-ray diffraction utilizing a synchrotron x-ray source. In both cases the simulations are compared with different aspects of the experimental strain information (surface strain or lattice strain), and then the simulations are used to explore aspects of the heterogeneous nature of the deformation that are difficult or impossible to measure experimentally.
C1 [Turner, T. J.; Shade, P. A.; Schuren, J.; Groeber, M. A.; Uchic, M. D.] AFRL RXLMP, Air Force Res Lab, Mat & Mfg Directorate, 2230 10th St, Wright Patterson AFB, OH 45433 USA.
RP Turner, TJ (reprint author), AFRL RXLMP, Air Force Res Lab, Mat & Mfg Directorate, 2230 10th St, Wright Patterson AFB, OH 45433 USA.
RI Shade, Paul/H-6459-2011
FU Cornell High Energy Synchrotron Source (CHESS); National Science
Foundation [DMR-0225180]
FX This work is based upon research conducted at the Cornell High Energy
Synchrotron Source (CHESS) which is supported by the National Science
Foundation under NSF award DMR-0225180.
NR 41
TC 1
Z9 1
U1 0
U2 5
PU JOHN WILEY & SONS
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND
BN 978-0-470-94320-5
PY 2012
BP 643
EP 652
PG 10
WC Metallurgy & Metallurgical Engineering
SC Metallurgy & Metallurgical Engineering
GA BGX57
UT WOS:000324518300072
ER
PT J
AU Miller, JD
Pollock, TM
AF Miller, Jonathan D.
Pollock, Tresa M.
BE Huron, ES
Reed, RC
Hardy, MC
Mills, MJ
Montero, RE
Portella, PD
Telesman, J
TI DEVELOPMENT AND APPLICATION OF AN OPTIMIZATION PROTOCOL FOR DIRECTIONAL
SOLIDIFICATION: INTEGRATING FUNDAMENTAL THEORY, EXPERIMENTATION AND
MODELING TOOLS
SO SUPERALLOYS 2012
LA English
DT Proceedings Paper
CT 12th International Symposium on Superalloys
CY SEP 09-13, 2012
CL Seven Springs, PA
SP TMS
DE Directional Solidification; Solidification Modeling; Liquid Metal
Cooling
AB A protocol for identifying the preferred process conditions for directional solidification has been developed using the axial thermal gradient at the surface of the casting during solidification. Solidification modeling has been utilized to predict local thermal conditions during solidification for a broad range of geometrical configurations, alloy compositions and heat-extraction conditions. Three different mold configurations were evaluated for three alloy compositions using both conventional and high-gradient directional solidification processes. The high-gradient directional solidification process investigated was the Liquid Metal Cooling (LMC) process that utilizes a liquid-metal coolant in the cold zone of the directional-solidification furnace. Process conditions associated with the development of dendritic structure and solidification defects have been analyzed in detail for each configuration. Classical defect maps have been extended to consider the important effects of solid-liquid interface curvature. The utilization of the surface maximum axial thermal gradient as a means to identify preferred processing conditions is applicable to a range of solidification conditions, and accounts for changes in casting geometry, alloy composition or degree of heat-extraction. Experiments have been conducted to validate model predictions and improve the understanding of the role of solid-liquid interface curvature on dendrite-growth morphology. The optimization technique has been demonstrated for an atypical casting configuration and applied to a complex geometry, in which time-dependent process conditions were required to maintain desired single-crystal growth.
C1 [Miller, Jonathan D.] Air Force Res Lab, Mat & Mfg Directorate, 2230 10th St, Wright Patterson AFB, OH 45433 USA.
RP Miller, JD (reprint author), Air Force Res Lab, Mat & Mfg Directorate, 2230 10th St, Wright Patterson AFB, OH 45433 USA.
NR 24
TC 7
Z9 7
U1 0
U2 2
PU JOHN WILEY & SONS
PI CHICHESTER
PA THE ATRIUM, SOUTHERN GATE, CHICHESTER, W SUSSEX PO 19 8SQ, ENGLAND
BN 978-0-470-94320-5
PY 2012
BP 653
EP 662
PG 10
WC Metallurgy & Metallurgical Engineering
SC Metallurgy & Metallurgical Engineering
GA BGX57
UT WOS:000324518300073
ER
PT S
AU Saylor, WW
Richie, DJ
AF Saylor, William W.
Richie, David J.
BE Osborne, ML
TI OPTIMAL SPACE EFFECTS: DRIVING FUTURE MILITARY GN&C TECHNOLOGY NEEDS
SO GUIDANCE AND CONTROL 2012
SE Advances in the Astronautical Sciences
LA English
DT Proceedings Paper
CT 35th Annual AAS Rocky Mountain Section Guidance and Control Conference
CY FEB 03-08, 2012
CL Breckenridge, CO
SP AAS, Rocky Mt Sect
AB This work builds on current exquisite performance in a variety of spacecraft components, subsystems, and algorithms in very demanding guidance, navigation, and control applications through flowing future national interest goals into satellite platform technology requirements within plausible constellation constructs identified along the way. Rather than hypothesizing new developments at the component and algorithm level, the paper focuses on the underlying rationale and methods for pushing the state-of-the-art GNC subsystems for space, from identifying future military challenges, to meeting planned threats with robust space effects (i.e. precise navigation and timing; intelligence, surveillance, and reconnaissance collection), the carefully designed, analyzed, integrated, and tested satellite systems usually work as well as expected on orbit and generally demonstrate robust performance in the presence of space environmental uncertainties. However, the latest complication is that each satellite must continually calculate power, energy, bandwidth, memory storage and thermal constraints and then "play forward" in, for example, a receding horizon optimal control construct that calculates the next move in an infinite game of space chess. The remainder of this work, then, initiates this investigation through identifying constellation constructs, addressing the utility optimal algorithms have on advancing the state-of the-art while still leveraging today's hardware with minimal changes, demonstrates how this all works with a single ISR small satellite slewing maneuver, and presents future tasks needed to adequately evolve these steps from concept to reality, noting that each optimization step, however simplified, places new GNC requirements upon space mission designers and developers.
C1 [Saylor, William W.] USAF Acad, Air Force Res Lab AFRL Liaison, Space Syst Res Ctr, Dept Astronaut, Colorado Springs, CO 80841 USA.
RP Saylor, WW (reprint author), USAF Acad, Air Force Res Lab AFRL Liaison, Space Syst Res Ctr, Dept Astronaut, Colorado Springs, CO 80841 USA.
NR 16
TC 0
Z9 0
U1 0
U2 1
PU UNIVELT INC
PI SAN DIEGO
PA PO BOX 28130, SAN DIEGO, CA 92128 USA
SN 1081-6003
BN 978-0-87703-585-5
J9 ADV ASTRONAUT SCI
PY 2012
VL 144
BP 357
EP 372
PG 16
WC Engineering, Aerospace
SC Engineering
GA BFX61
UT WOS:000321807500024
ER
PT B
AU Doyle, D
Reynolds, W
Arritt, B
Taft, B
AF Doyle, Derek
Reynolds, Whitney
Arritt, Brandon
Taft, Brenton
GP ASME
TI COMPUTATIONAL SETUP OF STRUCTURAL HEALTH MONITORING FOR REAL-TIME
THERMAL VERIFICATION
SO PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE
STRUCTURES AND INTELLIGENT SYSTEMS (SMASIS 2011), VOL 2
LA English
DT Proceedings Paper
CT 4th Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures
and Intelligent Systems (SMASIS)
CY SEP 18-21, 2011
CL Scottsdale, AZ
SP ASME, AIAA
ID SPACE STRUCTURES; BOLTED JOINTS; RESISTANCE
AB Research at the AFRL Space Vehicles Directorate is being conducted to reduce schedule times for assembly, integration, and test, to make satellite-based capabilities more responsive to user needs. Structural Health Monitoring has been pursued as a means for validating workmanship and has been proven on PnPSat-1. Embedded ultrasonic piezoelectric wafer active sensors (PWAS) have been utilized with local and global inspection techniques, developed both in house and by collaborating universities, to detect structural changes that may occur during assembly, integration, and test. Specific attention has focused on interface qualification. It is now reasonable to believe that evaluation of interfaces through the use of such sensors can also be used to indirectly qualify the structure thermally and that tedious thermal-vacuum testing may be truncated or eliminated altogether. This paper focuses on the computational development of extracting thermal properties from ultrasonic transmission records. Methods are validated on simple bolted lap-joint cantilever beams.
C1 [Doyle, Derek; Reynolds, Whitney; Arritt, Brandon; Taft, Brenton] Space Vehicles Directorate, Air Force Res Lab, Kirtland AFB, NM USA.
RP Doyle, D (reprint author), Space Vehicles Directorate, Air Force Res Lab, Kirtland AFB, NM USA.
NR 24
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5472-3
PY 2012
BP 447
EP 453
PG 7
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA BGA72
UT WOS:000322090300054
ER
PT B
AU Reynolds, W
Doyle, D
Arritt, B
AF Reynolds, Whitney
Doyle, Derek
Arritt, Brandon
GP ASME
TI INSIGHT INTO ACTIVE HEALTH MONITORING METHODS USING MACHINE LEARNING
SO PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE
STRUCTURES AND INTELLIGENT SYSTEMS (SMASIS 2011), VOL 2
LA English
DT Proceedings Paper
CT 4th Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures
and Intelligent Systems (SMASIS)
CY SEP 18-21, 2011
CL Scottsdale, AZ
SP ASME, AIAA
AB Current satellite validation tests involve numerous procedures to qualify the space vehicle for the vibrations expected during launch and for exposure to the space environment. Structural Health Monitoring methods are being considered in an effort to truncate the number of validation tests required for satellite checkout. The most promising of these monitoring techniques uses an active wave-based method in which an active piezoelectric transducer propagates a Lamb wave through the structure, where it is then received by a second sensor and evaluated over time to detect structural changes. Thus far, this method has proven effective in locating structural defects in a complex satellite panel; however, the attributes associated with the first wave arrival change significantly as the wave travels through ribs and interfaces. This study establishes a method to identify important features in the sensor signal that may otherwise be missed. In this work, an FE model of a plate is developed, and variability is introduced for each state observation. Different states are modeled as masses distributed at 12 locations. Signals are obtained through an explicit time-domain analysis. Matching Pursuit Decomposition is used to extract physically significant parameters from the signal, the features are reduced to a more manageable subset, and Support Vector Machines are utilized to identify important features in the sensor signal. The results of the classification indicate that for a plate specimen the extracted feature corresponding to anti-symmetric wave mode interaction with damage does the best job of differentiating damage states.
C1 [Reynolds, Whitney; Doyle, Derek; Arritt, Brandon] Space Vehicles Directorate, Air Force Res Lab, Kirtland AFB, NM USA.
RP Reynolds, W (reprint author), Space Vehicles Directorate, Air Force Res Lab, Kirtland AFB, NM USA.
NR 18
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5472-3
PY 2012
BP 535
EP 543
PG 9
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA BGA72
UT WOS:000322090300065
ER
PT B
AU Maschmann, MR
Ehlert, GJ
Baur, JW
AF Maschmann, Matthew R.
Ehlert, Gregory J.
Baur, Jeffery W.
GP ASME
TI PIEZORESISTIVE RESPONSE OF ALIGNED CARBON NANOTUBE ARRAYS FOR FLOW
SENSING APPLICATIONS
SO PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE
STRUCTURES AND INTELLIGENT SYSTEMS (SMASIS 2011), VOL 2
LA English
DT Proceedings Paper
CT 4th Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures
and Intelligent Systems (SMASIS)
CY SEP 18-21, 2011
CL Scottsdale, AZ
SP ASME, AIAA
ID AIR; RESISTANCE; FILMS; HAIRS
AB We investigate the electromechanical sensing capabilities of aligned carbon nanotube (CNT) arrays as a means for a lightweight and simple electromechanical transduction element. CNT array heights of 25 and 350 mu m are examined using a modified dynamic mechanical analyzer (DMA) to impart multiple strain-based test configurations while simultaneously measuring electrical resistance. Observed gauge factors range from 12.5 for the 25 mu m array to greater than 190 for the 350 mu m array, with a peak sensitivity of 13,750 ohms/gram force achieved for the 350 mu m array. The electromechanical response observed was independent of the examined frequency range, suggesting high fidelity sensory capabilities. Results of this study serve as a preliminary proof of concept for using CNT arrays as a transduction mechanism for a proposed artificial hair sensor for small air vehicles.
C1 [Maschmann, Matthew R.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Maschmann, MR (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 21
TC 0
Z9 0
U1 0
U2 2
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5472-3
PY 2012
BP 673
EP 680
PG 8
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA BGA72
UT WOS:000322090300081
ER
PT B
AU McClung, AJW
Shumaker, JA
Baur, JW
AF McClung, Amber J. W.
Shumaker, Joseph A.
Baur, Jeffery W.
GP ASME
TI NOVEL BISMALEIMIDE-BASED SHAPE MEMORY POLYMERS: COMPARISON TO COMMERCIAL
SHAPE MEMORY POLYMERS
SO PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE
STRUCTURES AND INTELLIGENT SYSTEMS (SMASIS 2011), VOL 1
LA English
DT Proceedings Paper
CT 4th Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures
and Intelligent Systems (SMASIS)
CY SEP 18-21, 2011
CL Scottsdale, AZ
SP ASME, AIAA
ID DEFORMATION
AB A series of novel shape memory polymers, synthesized from 4-4-bismaleimidodiphenyl-methane, an extended chain aliphatic diamine, and a bis-isocyanate, have been created and characterized with the aim of providing a family of robust high temperature shape memory polymers with tailorable transition temperatures for use in reconfigurable aerospace structures. In the present study, three of the polymers are chosen for more detailed study of their thermomechanical properties. These materials are compared to commercial resins Veriflex (R) and Veriflex-E (R) which are styrene- and epoxy-based proprietary formulations, respectively. The thermal and mechanical properties are determined utilizing thermogravimetric analysis and dynamic mechanical analysis. The temperatures at which 2% weight loss is observed in dry air ranges from 272 to 305 degrees C for the synthesized polymers, and occurs at 242 and 317 degrees C for the commercial Veriflex (R) and Veriflex-E (R) respectively. The glass transition temperatures, as measured by the peak in the tan(delta) curve, for the synthesized polymers range from 110 to 144 degrees C which is a higher than the Veriflex (R) and Veriflex-E (R) achieve at 84.3 and 100 degrees C respectively. With operation temperatures of subsonic structural aircraft components often reaching 121 degrees C (250 degrees F), the transition temperatures of the bismaleimide-based shape memory polymers are clearly desirable to ensure that shape memory polymers used in aircraft structures will not be prematurely triggered by the existing heat loads. In addition, the shape memory performance of the bismaleimide-based shape memory polymers compares well with the Veriflex (R) and Veriflex-E (R) resins.
C1 [McClung, Amber J. W.; Shumaker, Joseph A.; Baur, Jeffery W.] Air Force Res Lab, Mat & Mfg Dir, Wright Patterson AFB, OH 45433 USA.
RP McClung, AJW (reprint author), Air Force Res Lab, Mat & Mfg Dir, Wright Patterson AFB, OH 45433 USA.
NR 14
TC 0
Z9 0
U1 1
U2 4
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5471-6
PY 2012
BP 95
EP 102
PG 8
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA BGA73
UT WOS:000322090400014
ER
PT B
AU Tandon, GP
Goecke, KE
Justice, RS
AF Tandon, G. P.
Goecke, K. E.
Justice, Ryan S.
GP ASME
TI INFLUENCE OF MICROSTRUCTURE AND UV-CONDITIONING ON THE MECHANICAL
RESPONSE OF POLYMERIC FOAM UNDER COMPRESSIVE LOADING
SO PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE
STRUCTURES AND INTELLIGENT SYSTEMS (SMASIS 2011), VOL 1
LA English
DT Proceedings Paper
CT 4th Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures
and Intelligent Systems (SMASIS)
CY SEP 18-21, 2011
CL Scottsdale, AZ
SP ASME, AIAA
AB The aim of this study is to evaluate the influence of microstructure, specifically, variations in foam cell size and density, on the compressive stress-strain behavior of polymeric foam material. Foams with varying densities are examined under incremental loadings to different prescribed strain levels. A comparison is made of the maximum stress level attained during deformation and residual strain on complete unloading and following recovery. Additionally, the durability of the foam material on exposure to service environment, namely, exposure to ultra-violet (UV) light and humidity, is considered. Cylindrical compression samples are exposed to Xenon Arc (63 degrees C, 18 minutes water and light/102 minutes light only) and spectral intensity of 0.3 to 0.4 watts/m(2) for 288 cycles. Parameters investigated include changes in modulus, maximum stress, residual strain and linear shape recovery due to conditioning and mechanical cycling.
C1 [Tandon, G. P.; Goecke, K. E.; Justice, Ryan S.] Air Force Res Lab, Mat & Mfg Dir, Wright Patterson AFB, OH 45433 USA.
RP Tandon, GP (reprint author), Air Force Res Lab, Mat & Mfg Dir, Wright Patterson AFB, OH 45433 USA.
NR 9
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5471-6
PY 2012
BP 103
EP 111
PG 9
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA BGA73
UT WOS:000322090400015
ER
PT B
AU Phillips, DM
Baur, JW
AF Phillips, David M.
Baur, Jeffery W.
GP ASME
TI THERMAL ACTIVATION OF SHAPE MEMORY POLYMERS THROUGH VASCULAR MEANS
SO PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE
STRUCTURES AND INTELLIGENT SYSTEMS (SMASIS 2011), VOL 1
LA English
DT Proceedings Paper
CT 4th Annual Meeting of the ASME/AIAA Smart Materials, Adaptive Structures
and Intelligent Systems (SMASIS)
CY SEP 18-21, 2011
CL Scottsdale, AZ
SP ASME, AIAA
AB Thermal activation of shape memory polymers requires a heating mechanism that will achieve a temperature range that exceeds a minimum triggering temperature but does not overheat the material. In laboratory practice, ovens are typically used to achieve a uniform temperature during testing. In practical applications, active heating schemes must be utilized that are robust enough to handle changing environmental conditions. In this work, we analyze the intricacies of vascular heating and cooling methodologies for shape memory polymers operating in an open environment.
Our methodology is based on analytical modeling of the steady state surface temperature of shape memory polymers that incorporate vascular channels. With the material properties and environmental conditions, the model is used to predict appropriate channel geometry for triggering the shape memory polymer. Thermography is used to verify the model predictions for real systems of shape memory polymers.
C1 [Phillips, David M.] UTC, Air Force Res Lab, Mat & Mfg Directorate, AFRL RXBC, Wright Patterson AFB, OH USA.
RP Phillips, DM (reprint author), UTC, Air Force Res Lab, Mat & Mfg Directorate, AFRL RXBC, Wright Patterson AFB, OH USA.
NR 5
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5471-6
PY 2012
BP 135
EP 140
PG 6
WC Engineering, Mechanical; Materials Science, Multidisciplinary
SC Engineering; Materials Science
GA BGA73
UT WOS:000322090400019
ER
PT S
AU Domonkos, MT
Heidger, S
Brown, D
Cavazos, T
Devoe, A
Dogan, F
Gale, D
O'Loughlin, J
Parker, J
Sandoval, D
Slenes, K
Sommars, W
Watrous, J
AF Domonkos, M. T.
Heidger, S.
Brown, D.
Cavazos, T.
Devoe, A.
Dogan, F.
Gale, D.
O'Loughlin, J.
Parker, J.
Sandoval, D.
Slenes, K.
Sommars, W.
Watrous, J.
BE Hegeler, F
TI Solid Dielectric Transmission Lines for Pulsed Power
SO PROCEEDINGS OF THE 2012 IEEE INTERNATIONAL POWER MODULATOR AND HIGH
VOLTAGE CONFERENCE
SE IEEE International Power Modulator and High Voltage Conference
LA English
DT Proceedings Paper
CT IEEE International Power Modulator and High Voltage Conference (IPMHVC)
CY JUN 03-07, 2012
CL San Diego, CA
SP IEEE, IEEE Dielectr & Elect Insulat Soc, IEEE Nucl & Plasma Sci Soc, IEEE Electron Devices Soc, Sandia Natl Labs, Dept Navy, Naval Res Lab, GE, INP Greifswald, L3 Appl Technologies, Pulse Sci, Lockheed Martin, Ness Engn Inc
DE solid dielectric; transmission line; pulsed power
AB This paper documents recent work developing solid dielectric transmission lines for sub-microsecond, 100 kV class compact pulsed power systems. Polymer-ceramic nanocomposite materials have demonstrated sub-microsecond discharge capability in parallel plate capacitors and transmission lines [1, 2]. With a dielectric constant of approximately 50, the propagation velocity is 2.5 cm/ns, necessitating lines of several meters length to achieve > 100 ns pulse lengths. By folding the line in a fashion analogous to ceramic multilayer capacitors, the physical length of the line can be significantly shorter than the electrical length. We present the results of an experimental effort to develop a folded transmission line using a polymer-ceramic nanocomposite dielectric. The pulse length was somewhat shorter than expected based on a simple calculation using the geometry and the dielectric constant. Fully 3-D electromagnetic calculations were used to examine the role of the edges in curtailing the pulse length. Dielectric breakdown in this device occurred below the electric field threshold demonstrated in the prior work [1].
Improvements in the large scale fabrication of TiO2 beginning with nanoscale grains have opened the possibility for producing single layer high voltage devices. Given a dielectric constant approaching 140, transmission lines using nano-TiO2 can be considerably shorter than with other materials. Relatively thick, flat sheets of TiO2 have been fabricated for testing up to 50 kV. Several transmission lines, employing a serpentine electrode geometry, have been manufactured and tested. Testing up to several 10's of kV has confirmed the operation of the lines according to the design. As expected, the triple point between the TiO2, electrode, and insulating medium has proven difficult to manage for high voltage operation. Several techniques to mitigate the effects of the triple point, including resistive grading at the edges of the electrodes, are discussed. Fully 3-D electromagnetic modeling is used to examine the effects of electrode geometry and composition on the performance of the lines.
C1 [Domonkos, M. T.; Heidger, S.; O'Loughlin, J.] Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM USA.
RP Domonkos, MT (reprint author), Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM USA.
NR 4
TC 0
Z9 0
U1 1
U2 5
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2380-808X
BN 978-1-4673-1225-7; 978-1-4673-1222-6
J9 IEEE INT POWER MODUL
PY 2012
BP 174
EP 179
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BGB05
UT WOS:000322131200042
ER
PT B
AU Finomore, V
Stewart, J
Singh, R
Raj, B
Dallman, R
AF Finomore, Victor, Jr.
Stewart, John
Singh, Rita
Raj, Bhiksha
Dallman, Ron
GP International Speech Communications Association
TI Demonstration of Advanced Multi-Modal, Network-Centric Communication
Management Suite
SO 13TH ANNUAL CONFERENCE OF THE INTERNATIONAL SPEECH COMMUNICATION
ASSOCIATION 2012 (INTERSPEECH 2012), VOLS 1-3
LA English
DT Proceedings Paper
CT 13th Annual Conference of the
International-Speech-Communication-Association
CY SEP 09-13, 2012
CL Portland, OR
SP Int Speech Commun Assoc
DE Multi-Modal Display; Communication Interface Automatic Speech
Recognition
AB The Multi Modal Communication tool was developed to improve mission effectiveness for Command and Control operators. This communication management suite combines mature communication technology to provide the operator with an intuitive display that allows on-demand access to mission critical communication data.
C1 [Finomore, Victor, Jr.] Air Force Res Lab, Battlespace Acoust Branch, Wright Patterson AFB, OH USA.
RP Finomore, V (reprint author), Air Force Res Lab, Battlespace Acoust Branch, Wright Patterson AFB, OH USA.
EM victor.finomore@wpafb.af.mil; stewartjm@gmail.com; rsingh@cs.cmu.edu;
bhiksha@cs.cmu.edu; ron.dallman.ctr@wpafb.af.mil
NR 6
TC 0
Z9 0
U1 0
U2 0
PU ISCA-INT SPEECH COMMUNICATION ASSOC
PI BAIXAS
PA C/O EMMANUELLE FOXONET, 4 RUE DES FAUVETTES, LIEU DIT LOUS TOURILS,
BAIXAS, F-66390, FRANCE
BN 978-1-62276-759-5
PY 2012
BP 2119
EP 2120
PG 2
WC Computer Science, Artificial Intelligence; Computer Science,
Interdisciplinary Applications; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BFO97
UT WOS:000320827201084
ER
PT S
AU Sabol, C
Binz, C
Segerman, A
Roe, K
Schumacher, PW
AF Sabol, Chris
Binz, Christopher
Segerman, Alan
Roe, Kevin
Schumacher, Paul W., Jr.
BE Schaub, H
Gunter, BC
Russell, RP
Cerven, WT
TI PROBABILITY OF COLLISION WITH SPECIAL PERTURBATIONS DYNAMICS USING THE
MONTE CARLO METHOD
SO ASTRODYNAMICS 2011, PTS I - IV
SE Advances in the Astronautical Sciences
LA English
DT Proceedings Paper
CT AAS/AIAA Astrodynamics Specialist Conference
CY JUL 31-AUG 04, 2011
CL AK
SP AAS, AIAA
ID OBJECTS
AB Special perturbations-based Monte Carlo methods were used to investigate approaches for estimating the probability of collision between two satellites. Sample populations for each satellite are produced via the covariance at epoch, then each sample is propagated to the time span of interest where the closest point of approach between samples is determined. The output of the Monte Carlo analyses produce a cumulative distribution function of miss distance, which, given the combined radius of the two satellites, can be translated into a probability of collision estimate. Comparisons are made against an analytical method and a two-body Monte Carlo method for LEO and GEO orbit cases. Additionally, the impact of covariance realism is considered through the introduction of a scale factor to the covariance matrix. The results indicate that, although the analytic method matches the Monte Carlo methods at the time of closest approach for the LEO case, the probability of collision calculations are in error likely because the propagated Cartesian covariance used as input do not adequately represent the orbit error probability distributions; these errors may be smaller, however, than errors due to covariance realism in general. A high performance computing framework called Collision and Conjunction Analysis (CoCoA), using shared or distributed memory, was utilized to generate results in a timely manner.
C1 [Sabol, Chris; Schumacher, Paul W., Jr.] USAF, Res Lab, AF Maui Opt & Supercomp, Kihei, HI 96753 USA.
RP Sabol, C (reprint author), USAF, Res Lab, AF Maui Opt & Supercomp, 535 Lipoa Pkwy,Suite 200, Kihei, HI 96753 USA.
NR 13
TC 0
Z9 0
U1 0
U2 1
PU UNIVELT INC
PI SAN DIEGO
PA PO BOX 28130, SAN DIEGO, CA 92128 USA
SN 1081-6003
BN 978-0-87703-577-0
J9 ADV ASTRONAUT SCI
PY 2012
VL 142
BP 1081
EP 1093
PG 13
WC Engineering, Aerospace
SC Engineering
GA BFY99
UT WOS:000321933400062
ER
PT S
AU DeMars, KJ
Bishop, RH
Jah, MK
AF DeMars, Kyle J.
Bishop, Robert H.
Jah, Moriba K.
BE Schaub, H
Gunter, BC
Russell, RP
Cerven, WT
TI SPACE OBJECT TRACKING IN THE PRESENCE OF ATTITUDE-DEPENDENT SOLAR
RADIATION PRESSURE EFFECTS
SO ASTRODYNAMICS 2011, PTS I - IV
SE Advances in the Astronautical Sciences
LA English
DT Proceedings Paper
CT AAS/AIAA Astrodynamics Specialist Conference
CY JUL 31-AUG 04, 2011
CL AK
SP AAS, AIAA
AB The tracking of space objects (SOs) is often accomplished via measurement systems such as optical telescopes, where the observations occur infrequently, leading to long periods of time in which the SO uncertainty must be propagated. Given that the uncertainty associated with an SO is described by a probability density function (pdf), the infrequent measurements and subsequent long arcs of propagation lead to difficulties in reacquisition due to inaccurate methods for the propagation of the pdf. The standard methods for propagation of the pdf are typically those of the extended Kalman filter (EKF) or unscented Kalman filter (UKF) which make use of only the first two moments of the pdf, thereby limiting their ability to accurately describe the actual pdf. This work examines an improved propagation scheme which allows for the pdf to be represented by a Gaussian mixture model (GMM) that is adapted online via splitting of the GMM components based on the detection of nonlinearity during the propagation. In doing so, the GMM approximation adaptively includes additional components as nonlinearity is encountered and can therefore be used to more accurately approximate the pdf. The improved representation of the uncertainty region of the SO can then be used to more consistently reacquire SOs, thereby improving the overall tracking of space objects. It is shown (via simulation) that the improved propagation scheme leads to a more realistic and accurate representation of the region of uncertainty. Furthermore, when the more accurately propagated uncertainty is fused with incoming measurement data, it is shown that the resultant updated uncertainty more accurately represents the true state and yields a smaller region of uncertainty.
C1 [DeMars, Kyle J.] Air Force Res Lab, NRC, Kirtland AFB, NM 87117 USA.
RP DeMars, KJ (reprint author), Air Force Res Lab, NRC, Kirtland AFB, NM 87117 USA.
OI Jah, Moriba/0000-0003-1109-0374
NR 16
TC 0
Z9 0
U1 0
U2 1
PU UNIVELT INC
PI SAN DIEGO
PA PO BOX 28130, SAN DIEGO, CA 92128 USA
SN 1081-6003
BN 978-0-87703-577-0
J9 ADV ASTRONAUT SCI
PY 2012
VL 142
BP 2801
EP 2820
PG 20
WC Engineering, Aerospace
SC Engineering
GA BFY99
UT WOS:000321933401043
ER
PT S
AU DeMars, KJ
Jah, MK
AF DeMars, Kyle J.
Jah, Moriba K.
BE Schaub, H
Gunter, BC
Russell, RP
Cerven, WT
TI EVALUATION OF THE INFORMATION CONTENT OF OBSERVATIONS WITH APPLICATION
TO SENSOR MANAGEMENT FOR ORBIT DETERMINATION
SO ASTRODYNAMICS 2011, PTS I - IV
SE Advances in the Astronautical Sciences
LA English
DT Proceedings Paper
CT AAS/AIAA Astrodynamics Specialist Conference
CY JUL 31-AUG 04, 2011
CL AK
SP AAS, AIAA
ID FILTER; TRACKING; ROBUST
AB Information regarding the state of a space object (SO) is typically inferred via measurement systems such as optical telescopes or radar systems. As the measurement systems become more advanced, a greater number of SOs can be detected which leads to an ever-increasing number of SOs that need to be uniquely identified. Given the lack of ubiquitous observations, scarce sensor resources must be optimally utilized, i.e. so that the telescope or radar systems are not tasked to acquire redundant or useless information. Additionally, in the Situation where multiple systems can observe the same object, the observation geometry needs to be accounted for so that the sensor which can provide the most information is employed, enabling other sensors to dedicate their time to observing other objects. This leads to a need for methods which evaluate the information gain (ambiguity reduction) that can be expected from any given sensor observing any given SO. To address this need, this work examines several information-theoretic approaches to determining the information content of observations and compares the different developed methods in the context of assessing the measurement utility and observation scheduling for orbit determination problems.
C1 [DeMars, Kyle J.] Air Force Res Lab, Kirtland AFB, NM 87117 USA.
RP DeMars, KJ (reprint author), Air Force Res Lab, Kirtland AFB, NM 87117 USA.
OI Jah, Moriba/0000-0003-1109-0374
NR 16
TC 0
Z9 0
U1 0
U2 0
PU UNIVELT INC
PI SAN DIEGO
PA PO BOX 28130, SAN DIEGO, CA 92128 USA
SN 1081-6003
BN 978-0-87703-577-0
J9 ADV ASTRONAUT SCI
PY 2012
VL 142
BP 3169
EP 3188
PG 20
WC Engineering, Aerospace
SC Engineering
GA BFY99
UT WOS:000321933401064
ER
PT S
AU Hoffman, CA
AF Hoffman, Christopher A.
BE Popper, AN
Hawkins, A
TI Mitigating Impacts of Underwater Noise From Dredging on Beluga Whales in
Cook Inlet, Alaska
SO EFFECTS OF NOISE ON AQUATIC LIFE
SE Advances in Experimental Medicine and Biology
LA English
DT Article
C1 US Army Corps Engineers, Elmendorf AFB, AK 99506 USA.
RP Hoffman, CA (reprint author), US Army Corps Engineers, Elmendorf AFB, AK 99506 USA.
EM Christopher.A.Hoffman@usace.army.mil
NR 4
TC 0
Z9 0
U1 1
U2 24
PU SPRINGER
PI NEW YORK
PA 233 SPRING STREET, NEW YORK, NY 10013, UNITED STATES
SN 0065-2598
BN 978-1-4419-7310-8
J9 ADV EXP MED BIOL
JI Adv.Exp.Med.Biol.
PY 2012
VL 730
BP 617
EP 619
DI 10.1007/978-1-4419-7311-5_140
PG 3
WC Biology; Medicine, Research & Experimental
SC Life Sciences & Biomedicine - Other Topics; Research & Experimental
Medicine
GA BFV95
UT WOS:000321592700140
PM 22278577
ER
PT S
AU Baird, LC
Carlisle, MC
Bahn, WL
Smith, E
AF Baird, Leemon C., III
Carlisle, Martin C.
Bahn, William L.
Smith, Eric
GP IEEE
TI The Glowworm hash: Increased Speed and Security for BBC Unkeyed Jam
Resistance
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
AB Jam resistance for omnidirectional wireless networks is an important problem. Existing jam-resistant systems use a secret spreading sequence or secret hop sequence, or some other information that must be kept secret from the jammer. There is currently only one system for achieving such jam resistance without any shared secret: BBC coding. BBC requires the use of a hash function that is fast and secure, but "secure" in a different sense than for standard cryptographic hashes. At MILCOM-2010, the Inchworm hash was presented In which is 300 times faster than SHA-1 for this application, and had no security flaws yet known. A variant of it, Inchworm-S, was also presented, that was intended to be more secure. We present an academic break of both Inchworm and Inchworm-S, and a practical break of the former. The advantage to the attacker is very small, but it is definitely detectable. We also present a new hash algorithm: Glowworm. Glowworm is simpler than Inchworm, and the same speed as Inchworm-S, while being more secure. We mathematically prove that it is immune to the theoretical attack we show for Inchworm and Inchworm-S. We also show empirically that it is immune to our empirical attack on Inchworm, even when the attack algorithm is run for much longer periods. In fact, we show that for our best attack software, it is indistinguishable from SHA-1, MD5, and all five SHA-3 candidates. We also mathematically prove that it has avalanche properties that prevent many other types of internal-state collisions and related attacks. We give a public domain, optimized, portable, C implementation of Glowworm. For incremental hashes as used in BBC codes, it can hash a string of arbitrary length in 11 clock cycles. That is not 11 cycles per bit or 11 cycles per byte. That is 11 cycles to hash the entire string, given that the current string being hashed differs from the last in only an addition or deletion of its last bit. Finally, we discuss our implementation of Glowworm in a Field Programmable Gate Array (FPGA), where it runs in just one clock cycle per string, using only a modest amount of resources.
C1 [Baird, Leemon C., III; Carlisle, Martin C.; Bahn, William L.] USAF Acad, Acad Ctr Cyberspace Res, Dept Comp Sci, Colorado Springs, CO 80840 USA.
RP Baird, LC (reprint author), USAF Acad, Acad Ctr Cyberspace Res, Dept Comp Sci, Colorado Springs, CO 80840 USA.
EM Leemon@Leemon.com; eric@brouhaha.com
NR 21
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900178
ER
PT S
AU Clark, M
AF Clark, Michael
GP IEEE
TI Robust Wireless Channel Based Secret Key Extraction
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
ID UNAUTHENTICATED PUBLIC CHANNELS; AGREEMENT
AB Prior work in channel based key extraction has assumed that the adversary has negligible knowledge/control of the wireless channel. Recent analysis, however, has shown that this assumption is not necessarily valid. Gaining a better understanding of the implications of this assumption is crucial as the wireless channel plays a critical role in the security of this type of key extraction system. In this paper, we discuss why we feel this assumption oversimplifies the problem and present a formal adversary model which takes into account an adversary's knowledge/control of the wireless channel. We present impossibility results learned from our formal model and discuss why previously proposed systems fail to defend against our adversary. We propose the first secret key extraction system which thwarts this adversary and give a generic implementation of our system.
C1 USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Clark, M (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM michael.clark2@wpafb.af.mil
NR 23
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900029
ER
PT S
AU Dubendorfer, CK
Ramsey, BW
Temple, MA
AF Dubendorfer, Clay K.
Ramsey, Benjamin W.
Temple, Michael A.
GP IEEE
TI An RF-DNA Verification Process for ZigBee Networks
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
DE RF-DNA; fingerprinting; ZigBee; verification; authentication; network
security
AB Impersonation of authorized network devices is a serious concern in applications involving monitoring and control of battlefield operations and military installation infrastructure ZigBee is among the ad hoc network alternatives used for such purposes. There are considerable security concerns given the availability of ZigBee "hacking" tools that have evolved from methods used for IEEE 802.11 Wi-Fi and IEEE 802.15.1 Bluetooth attacks. To mitigate the effectiveness of these bit-level attacks, RF waveform features within the lowest OSI physical (PHY) layer are used to augment bit-level security mechanisms within higher OSI layers. The evolution of RF 'Distinct Native Attribute' (RF-DNA) fingerprinting continues here with a goal toward improving defensive RF Intelligence (RFINT) measures and enhancing rogue device detection.
Demonstrations here involve ZigBee burst collection and RF-DNA fingerprint generation using experimentally collected emissions from like-model CC2420 ZigBee devices operating at 2.4 GHz. RF-DNA fingerprints from 7 authorized devices are used for Multiple Discriminant Analysis (MDA) training and authorized device classification performance assessed, i.e. answering: "Is the device 1 of M authorized devices?" Additional devices are introduced as impersonating rogue devices attempting to gain unauthorized network access by presenting false bit-level credentials for one of the M authorized devices. Granting or rejecting rogue network access is addressed using a claimed identity verification process, i.e, answering: "Does the device's current RF-DNA match its claimed bit-level identity?" For authorized devices, arbitrary classification and verification benchmarks of %C> 90% and %V > 90% are achieved at SNR approximate to 10.0 dB using a test statistic based on assumed Multivariate Gaussian (MVG) likelihood values. Overall, rogue device rejection capability is promising using the same verification test statistic, with %V < 10% (90% or better rejection) achieved for 11 of 14 rogue trials. One case yielded near 85% rogue verification (unauthorized access) and security cannot be a matter of chance work continues to find a more robust test statistic and improve the proposed process.
C1 [Dubendorfer, Clay K.; Ramsey, Benjamin W.; Temple, Michael A.] USAF, Inst Technol, Dept Elect & Comp Engn, Dayton, OH 45433 USA.
RP Dubendorfer, CK (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, Dayton, OH 45433 USA.
EM Clay.Dubendorfer@afit.edu; Benjamin.Ramsey@afit.edu;
Michael.Temple@afit.edu
NR 17
TC 0
Z9 0
U1 1
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900244
ER
PT S
AU Ellinger, J
Depoy, R
Sanderson, J
Huang, KY
Wu, ZQ
AF Ellinger, John
Depoy, Randy
Sanderson, Josh
Huang, Kaiyu
Wu, Zhiqiang
GP IEEE
TI Blind Frequency Offset Estimation and Intercarrier Interference
Cancelation for FD-MC-CDMA Systems in Aerial Vehicle Communication
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
ID OFDM SYSTEMS; PERFORMANCE; SPECTRUM; SCHEME
AB FD-MC-CDMA is an attractive candidate for next generation high speed aerial vehicle communication for its high spectrum efficiency and excellent BER performance. Similar to other multi-carrier transmission technologies, FD-MC-CDMA suffers significant performance degradation resulting from intercarrier interference (ICI) in high mobility environments. Particularly, because of the ICI is observed from all other subcarriers, the benefit of decomposing subcarriers into non-contiguous sets diminishes. In this paper, we propose a parallel processing based blind frequency offset estimation and ICI cancelation method for FD-MC-CDMA system to significantly improve the BER performance in high mobility environment. Specifically, by exploiting frequency offset quantization, the proposed scheme takes advantage of the orthogonality of the ICI matrix and offers excellent ICI cancelation and significant BER improvement. Moreover, the proposed scheme does not lower the transmission rate or reduce the network capacity. It is important to note that the proposed ICI cancelation scheme maintains the low complexity of optimum multi-user detection (MUD) receiver and achieves the ICI cancelation and excellent BER performance at linearly growing cost. Simulation results in AWGN channel and multi-path fading channel confirm the performance of the proposed scheme in the presence of frequency offset and in mobile channel.
C1 [Ellinger, John] AF Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Depoy, Randy; Sanderson, Josh; Huang, Kaiyu; Wu, Zhiqiang] Wright State Univ, Dept Elect Engn, Wright Patterson AFB, OH USA.
RP Ellinger, J (reprint author), AF Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
FU National Science Foundation; Wright Center for Sensor System
Engineering; Air Force Research Laboratory
FX This work is partially supported by the National Science Foundation, the
Wright Center for Sensor System Engineering, and the Air Force Research
Laboratory. Any opinions, findings, and conclusions or recommendations
expressed in this material are those of the author(s) and do not
necessarily reflect the views of the funding agencies.
NR 15
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900280
ER
PT S
AU Halford, TR
Courtade, TA
Turck, KA
AF Halford, Thomas R.
Courtade, Thomas A.
Turck, Kurt A.
GP IEEE
TI The User Capacity of Barrage Relay Networks
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
AB Barrage relay networks (BRNs) are a class of mobile ad hoc networks based on an autonomous cooperative communications scheme that affords a distributed, rapid, and robust broadcast mechanism. BRN-based radios are currently being used operationally; understanding scaling laws for BRNs can thus shed light on how future systems ought be designed to address a wider range of military missions. It has previously been shown that BRNs scale optimally for broadcast traffic (in terms of sum throughput and latency). Furthermore, experimental evidence supports the scalability of BRNs in practice: a 215-node network of Trellis Ware's BRN-based Cheetah Net radios was demonstrated in 2010 as part of the Rim of the Pacific (RIMPAC) exercise.
In this work, we study scaling laws for unicast in BRNs. The spatial extent of unicast transmissions in BRNs can be contained via controlled barrage regions (CBRs), while barrage access control protocols - which are a type of path-oriented medium access control (PO-MAC) protocol can be used to schedule CBRs in space and time. Traditional techniques for scaling analysis support neither autonomous cooperation nor POMAC protocols; we therefore study the fundamental limits of CBR-based protocols through the lens of user capacity, which we define as the maximum number of constant-rate, delay-optimal unicast flows that an n-node network can simultaneously support.
The user capacity of dense networks operating under a CBR protocol is shown to scale as Theta(root n) when source-destination pairs are chosen randomly. BRNs are thus able to transport (Theta(root n/log n) bit-meters/sec, which is order optimal (in the Gupta-Kumar sense). If the source-destination pairs are instead chosen so that their separation (in hops) is a geometric random variable, then the user capacity scales as Theta(n/log n). Thus, in a wireless network dominated by localized traffic, BRNs can achieve throughput that is almost linear in the number of users.
Finally, it is shown via software simulation that distributed, greedy algorithms provide order optimal scheduling of CBRs for both the random and localized traffic models. This suggests that scalable protocols for unicast in BRNs can be realized in practice.
C1 [Halford, Thomas R.] TrellisWare Technol Inc, 16516 Via Esprillo,Suite 300, San Diego, CA 92127 USA.
[Courtade, Thomas A.] Stanford Univ, Ctr Sci Informat, Stanford, CA 94305 USA.
[Turck, Kurt A.] US Air Force, Res Lab, Networking Technol Branch, Rome, NY 13441 USA.
RP Halford, TR (reprint author), TrellisWare Technol Inc, 16516 Via Esprillo,Suite 300, San Diego, CA 92127 USA.
EM thalford@trellisware.com; tom.courtade@gmail.com; Kurt.Turck@rl.af.mil
FU AFRL [FA8750- 11- C- 0169]
FX Approved for Public Release; Distribution Unlimited: 88ABW- 2012- 4037
dated 20 Jul 2012. ACKNOWLEDGMENT OF SUPPORT AND DISCLAIMER: ( a)
Contractor acknowledges Government's support in the publication of this
paper. This material is based upon work funded by AFRL under AFRL
Contract No. FA8750- 11- C- 0169. ( b) Any opinions, findings and
conclusions or recommendations expressed in this material are those of
the author( s) and do not necessarily reflect the views of AFRL.
NR 16
TC 0
Z9 0
U1 7
U2 7
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900176
ER
PT S
AU Lenzi, R
Suri, N
Uszok, A
Hanna, J
Milligan, J
AF Lenzi, Rita
Suri, Niranjan
Uszok, Andrzej
Hanna, James
Milligan, James
GP IEEE
TI Supporting Information Management and Information Superiority via
Federation Services
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
DE Information Management; Coalition Operations; Interoperability;
Network-centric systems and technologies; System of systems
AB Network-centric warfare is often credited for the superior warfighting capabilities of the United States. One of the fundamental requirements for network-centric warfare is the timely exchange of information critical to mission success. The Phoenix Information Management Services (IMS) have been developed to address this all-important requirement. This paper describes a set of federation services that extend the Phoenix IMS to span multiple enclaves or domains of information management. Federation services interconnect multiple instances of Phoenix and support controlled information exchange across enclaves. Federation services, coupled with the core Phoenix information management services, are a force multiplier, allowing information to be shared across not just one, but any number of domains and information spaces. This in turn promotes shared situational awareness, unity of command, and synchronized operations across a variety of missions.
C1 [Lenzi, Rita; Suri, Niranjan; Uszok, Andrzej] IHMC, Pensacola, FL 32502 USA.
[Suri, Niranjan] US Army, Res Lab, Adelphi, MD USA.
[Hanna, James; Milligan, James] US Air Force, Res Lab, Rome, NY USA.
RP Lenzi, R (reprint author), IHMC, Pensacola, FL 32502 USA.
FU U. S. Air Force Research Laboratory under Cooperative Agreement
[FA8750-02-2-0174]
FX This project was sponsored in part by the U. S. Air Force Research
Laboratory under Cooperative Agreement FA8750-02-2-0174.
NR 6
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900278
ER
PT S
AU Lightfoot, LE
Laubie, E
AF Lightfoot, Leonard E.
Laubie, Ellen
GP IEEE
TI Channel Characterization and Throughput Tradeoff for Wireless Sensor
Networks
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
DE Wireless Sensor Networks; Energy Detection; Frequency Hopping;
Throughput
AB With the growing number of wireless network standards operating in the unlicensed frequency band and the military moving toward commercial off the shelf technology, the next generation of wireless sensor networks must be robust against unintentional and hostile interference. One method that has gained interest to cope with the increased spectrum use and to combat the interference vulnerability in wireless sensor networks is frequency agile communication. These techniques typically entail spectrum sensing and dynamic frequency channel allocation. In this paper, the energy detection mechanism is used to investigate how the number of frequency channels characterized for spectrum sensing impacts the accuracy of frequency channel selection and how the number of channels characterized affects the achievable throughput. From the investigation, we observed a tradeoff between the number of channels characterized, the number of energy samples used in energy detection, and the achievable throughput.
C1 [Lightfoot, Leonard E.; Laubie, Ellen] USAF, Res Lab, Dayton, OH 45433 USA.
RP Lightfoot, LE (reprint author), USAF, Res Lab, Dayton, OH 45433 USA.
NR 16
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0
J9 IEEE MILIT COMMUN C
PY 2012
PG 5
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900121
ER
PT S
AU Metzler, JM
Holmes, BR
Renodin, MP
AF Metzler, James M.
Holmes, Brian R.
Renodin, Matthew P.
GP IEEE
TI An Architecture to Support Information Availability in the Tactical
Domain
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
DE Distributed information systems; High performance computing; Information
management
AB Access to information is critical to both the commander in an AOC and the warfighter in the field. Typically information is readily available at centralized command posts, however, at the tactical edge, resources are far more limited, making information dissemination a challenge. Targeting pods, already found mounted to the hardpoints of many tactical aircraft, provide a cost effective platform for making information available to tactical users. To this end, the Network-Centric Exploitation and Tracking (N-CET) program is designing, developing, and implementing a proof of concept architecture for pods that is net-centric, reconfigurable, and allows processing at the sensor. The approach taken to achieve these attributes is to embed processing and communications on the pod, and employ net-centric exploitation and fusion algorithms to distil information from high fidelity sensor data. Information Management services provide the interface between the sensors, processing, and network, disseminating information between algorithms, and prioritizing it as it goes out over the network. This paper provides an overview of the N-CET architecture and the sensors and net-centric algorithms integrated to evaluate the performance of the architecture through ground based experimentation.
C1 [Metzler, James M.; Holmes, Brian R.] AF Res Lab, Informat Directorate, Rome, NY 13441 USA.
[Renodin, Matthew P.] ITT Excelis, Rome, NY 13441 USA.
RP Metzler, JM (reprint author), AF Res Lab, Informat Directorate, Rome, NY 13441 USA.
EM james.metzler@rl.af.mil; brian.holmes@rl.a.mil;
matthew.renodin@exelisinc.com
NR 10
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900079
ER
PT S
AU Morelli, A
Kohler, R
Stefanelli, C
Suri, N
Tortonesi, M
AF Morelli, Alessandro
Kohler, Ralph
Stefanelli, Cesare
Suri, Niranjan
Tortonesi, Mauro
GP IEEE
TI Supporting COTS Applications in Tactical Edge Networks
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
DE SOA; Tactical Edge Networks; Network Proxies; Legacy Application Support
AB Military applications are relying more and more on Commercial Off-The-Shelf (COTS) hardware and software to build their information infrastructure. However, many COTS applications have been designed for wired infrastructure networks, where bandwidth and latency are not a problem, and exhibit severe performance problems when deployed in Tactical Edge Networks. To address the issues that traditional transport protocols, such as TCP, exhibit in this environment, researchers proposed several transport protocol solutions specifically developed for Tactical Edge Networks. However, these solutions require modifications to the applications in order to be adopted. This paper presents the Agile Computing Middleware (ACM) Net Proxy: a proxy-based approach to support the deployment of COTS applications on Tactical Edge Networks. Net Proxy transparently intercepts the applications' TCP and UDP traffic and conveys it over Mockets-based connections, while also providing other useful features such as stream compression. We tested Net Proxy in an emulated environment and the results demonstrate that, besides enabling the deployment of COTS applications, Net Proxy is also capable of improving their performance.
C1 [Morelli, Alessandro; Suri, Niranjan] Florida Inst Human & Machine Cognit IHMC, Pensacola, FL 32502 USA.
[Morelli, Alessandro; Stefanelli, Cesare; Tortonesi, Mauro] Univ Ferrara, Dept Engn, Ferrara, Italy.
[Kohler, Ralph; Suri, Niranjan] US Air Force, Res Lab, Rome, NY USA.
US Army, Res Lab, Adelphi, MD USA.
RP Morelli, A (reprint author), Florida Inst Human & Machine Cognit IHMC, Pensacola, FL 32502 USA.
FU U. S. Air Force Research Laboratory [FA8750- 11- 2- 0095]; Office of
Naval Research / U. S. Navy Space and Naval Warfare Systems Command
(SPAWAR) [N66001- 11- C- 0045]
FX This effort has also been funded in part by the U. S. Air Force Research
Laboratory under cooperative agreement FA8750- 11- 2- 0095 and by the
Office of Naval Research / U. S. Navy Space and Naval Warfare Systems
Command (SPAWAR) under contract N66001- 11- C- 0045.
NR 8
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 7
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900202
ER
PT S
AU Pal, P
Atighetchi, M
Gronosky, A
Loyall, J
Payne, C
Sinclair, A
Froberg, B
Grant, R
AF Pal, Partha
Atighetchi, Michael
Gronosky, Andrew
Loyall, Joseph
Payne, Charles
Sinclair, Asher
Froberg, Brandon
Grant, Robert
GP IEEE
TI Cooperative Red Teaming of a Prototype Surivable Service-Oriented System
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
DE component; Service-Oriented Architecture; Survivability; Adaptive
Security; Red Team Evaluation
AB An increasing number of military systems are being developed using service orientation. Some of the features that make service orientation appealing, like loose coupling, dynamism and composition-oriented system construction, make securing service-based systems more complicated. We have been developing technologies for Advanced Protected Services (APS) to improve the resilience and survival of services under cyber attack. These technologies introduce a layer to absorb, contain, and adapt to cyber attacks before attacks reach critical services. This paper describes an evaluation of these advanced protection technologies using cooperative red teaming. In cooperative red teaming, an independent red team launches attacks on a protected enclave in order to evaluate the efficacy and efficiency of the protection technologies, but the red team is provided full knowledge of the system under test and its protections, and is given escalating levels of access to the system. The red team also operates within agreed upon rules of engagement designed to focus their effort on useful evaluation results. Apart from presenting the evaluation results, we also discuss cooperative red teaming as an effective means of evaluating cyber security.
C1 [Pal, Partha; Atighetchi, Michael; Gronosky, Andrew; Loyall, Joseph] Raytheon BBN Technol, Cambridge, MA 02138 USA.
[Payne, Charles] Adventium Labs, Minneapolis, MN USA.
[Sinclair, Asher; Froberg, Brandon] US Air Force, Res Lab, Rome, NY USA.
RP Pal, P (reprint author), Raytheon BBN Technol, Cambridge, MA 02138 USA.
EM ppal@bbn.com; matighet@bbn.com; agronosk@bbn.com; jloyall@bbn.com;
charles.payne@adventiumlabs.com; Asher.Sinclair@rl.af.mil;
Brandon.Froberg@rl.af.mil; Robert.Grant@rl.af.mil
FU US Air Force Research Laboratory ( AFRL) [FA8750- 09- C- 0216]; [88ABW-
2012- 2507]
FX This work was supported by the US Air Force Research Laboratory ( AFRL)
under contract FA8750- 09- C- 0216. This paper is approved for public
release dated 27 Apr 2012, case number 88ABW- 2012- 2507.
NR 14
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900211
ER
PT S
AU Patel, H
Baldwin, R
AF Patel, Hiren
Baldwin, Rusty
GP IEEE
TI Differential Power Analysis Using Wavelet Decomposition
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
AB Differential Power Analysis (DPA) has been successfully used against crytographic hardware to extract the secret key in a non-invasive manner. However, the great success of DPA requires a large number of traces to overcome system noise or countermeasures, which equates to increased processing times and computing hardware requirements. We investigate wavelet decomposition of a DPA trace data set as a means to reducing the number of traces. By decomposing the signal into various wavelet coefficient levels, we identify those that reduce DPA performance and mitigate their impact. We achieve an 11.53% increase in correct key correlation value vs traditional DPA and exceed traditional DPA with as little as 30 traces. This method significantly reduces the number of traces needed to overcome system noise and counter-measures which introduce random operations.
C1 [Patel, Hiren; Baldwin, Rusty] USAF, Inst Technol, Wright Patterson AFB, OH 45440 USA.
RP Patel, H (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45440 USA.
EM hpatel@afit.edu; rbaldwin@afit.edu
NR 9
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0
J9 IEEE MILIT COMMUN C
PY 2012
PG 5
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900053
ER
PT S
AU Patel, H
Baldwin, R
AF Patel, Hiren
Baldwin, Rusty
GP IEEE
TI GPU Accelerated Differential Power Analysis
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
ID CUDA
AB Differential Power Analysis (DPA) is a powerful technique that has proven devastatingly effective against various encryption algorithms such as AES, Triple-DES and RSA. DPA has been able to successfully extract the secret key from these algorithms during the process of decrypting cyphertext information. Even in implementations with counter-measures, DPA can still be effective with additional traces, however at the cost of a corresponding increase in processing times. Hundreds of thousands to millions of traces may be necessary to defeat counter-measures; even high-end workstations can take days to process such large data sets. Graphics Processing Units (GPUs), available in most desktops as graphics cards on the other hand, have been effectively used in many parallel processing tasks. We use the GPU to accelerate DPA analysis and find a speedup of more than 200 times over workstation processing time. Using this method, we reduce computation time for a particular attack from 41 minutes to 12.24 seconds including the time for data transfer between the GPU and CPU.
C1 [Patel, Hiren; Baldwin, Rusty] USAF, Inst Technol, Wright Patterson AFB, OH 45440 USA.
RP Patel, H (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45440 USA.
EM hpatel@afit.edu; rbaldwin@afit.edu
NR 9
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 5
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900052
ER
PT S
AU Stout, WMS
Baldwin, RO
AF Stout, William M. S.
Baldwin, Rusty O.
GP IEEE
TI Network Performance Impact of Access Control Policies in Tactical
Wireless Networks
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
DE Access control; tactical wireless network; cyber security; coalition
networks; multinational networks
AB Tactical Wireless Networks (TWN) are a cornerstone of military communications in deployed environments. In TWNs bandwidth and network resources are extremely limited; efficient security mechanisms must be considered as networks become exposed to multinational access, influence and composition as well as increasingly complex security protocols. The communication burden of the WSN Authorization Specification Language (WASL) access control policies on an Enhanced Position Location Reporting Service network is analyzed for three needlines: Carrier Sense Multiple Access (CSMA), Dynamically Allocated Permanent Virtual Circuits (DAP), and Multiple Source Group (MSG).
Results determined that CSMA needlines quickly exhausted resources as nodes vied for transmission time; shorter delay times were experienced but suffered greater packet losses. The DAP needlines generally performed very well. The virtual circuits allowed data to be transmitted reliably resulting in a high completion rate with moderate to extreme delay times depending on resource contention. In small networks or networks with few sources, multiple MSG shares could be used to increase guaranteed bandwidth. The traffic model applied to the MSG network was well suited for this and had high completion rates for messages. However, as the number available of shares dwindled, delay and communication loss increased dramatically.
C1 [Stout, William M. S.; Baldwin, Rusty O.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
RP Stout, WMS (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
NR 16
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900266
ER
PT S
AU Vanderpoorten, J
Moody, CJ
Streland, CA
Cohen, J
Cornell, C
Breese, S
Pino, R
Weatherford, V
Hamilton, J
AF Vanderpoorten, Joe
Moody, Col Jay
Streland, Col Arnold
Cohen, Julie
Cornell, Charles
Breese, Steve
Pino, Rich
Weatherford, Virgil
Hamilton, Jim
GP IEEE
TI Transformational Satellite Communications System (TSAT) Lessons Learned
SO 2012 IEEE MILITARY COMMUNICATIONS CONFERENCE (MILCOM 2012)
SE IEEE Military Communications Conference
LA English
DT Proceedings Paper
CT IEEE Military Communications Conference (MILCOM)
CY OCT 29-NOV 01, 2012
CL Orlando, FL
SP IEEE, AFCEA Int, IEEE Commun Soc
DE Acquisition Management; Global Information Grid; Satellite Acquisition;
Risk Management; Enterprise Management
AB The Transformational Satellite Communications System (TSAT) Program was intended to extend the Global Information Grid (GIG) to disadvantaged users through a robustly interconnected, high capacity space-based capability. Prior to its cancellation primarily for affordability, the $3B TSAT investment demonstrated many organizational, enterprise and technological innovations to deploy the next generation transformational communication technologies. While the government investment strategy has changed, many of these innovations remain relevant and useful to any system-of-systems acquisitions. With inputs from across TSAT's senior government acquisition and Federally Funded Research Development and Center (FFRDC) leadership, this paper explores the TSAT's lessons learned in support of future enterprise program planning. The paper also explores the technical challenges associated with interconnection of tactical Internet Packet (IP)-based communications systems. The paper's findings include governance successes and challenges across several management areas.
C1 [Vanderpoorten, Joe; Moody, Col Jay; Streland, Col Arnold] USAF, IA-5, Washington, DC 20330 USA.
[Pino, Rich] USAF, SES, Washington, DC USA.
[Cornell, Charles; Breese, Steve; Weatherford, Virgil; Hamilton, Jim] Aerosp Corp, El Segundo, CA USA.
[Cohen, Julie] Carnegie Mellon SEI, Washington, DC USA.
RP Vanderpoorten, J (reprint author), USAF, IA-5, Washington, DC 20330 USA.
NR 0
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2155-7578
BN 978-1-4673-1729-0; 978-1-4673-1730-6
J9 IEEE MILIT COMMUN C
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BEY60
UT WOS:000318702900305
ER
PT S
AU Thompson, EA
Anderson, T
AF Thompson, Elizabeth A.
Anderson, Timothy
GP IEEE
TI USE OF CUDA FOR THE CONTINUOUS SPACE LANGUAGE MODEL
SO 2012 IEEE CONFERENCE ON HIGH PERFORMANCE EXTREME COMPUTING (HPEC)
SE IEEE High Performance Extreme Computing Conference
LA English
DT Proceedings Paper
CT IEEE Conference on High Performance Extreme Computing (HPEC)
CY SEP 10-12, 2012
CL Waltham, MA
SP IEEE
DE CUDA; CSLM; GPU; statistical signal processing; CUBLAS
AB The training phase of the Continuous Space Language Model (CSLM) was implemented in the NVIDIA hardware/software architecture Compute Unified Device Architecture (CUDA). Implementation was accomplished using a combination of CUBLAS library routines and CUDA kernel calls on three different CUDA enabled devices of varying compute capability and a time savings over the traditional CPU approach demonstrated.
C1 [Thompson, Elizabeth A.] Purdue Univ, Dept Engn, Ft Wayne, IN 46835 USA.
[Anderson, Timothy] Wright Patterson Air Force Base, Human Performance Wing, Dayton, OH USA.
RP Thompson, EA (reprint author), Purdue Univ, Dept Engn, Ft Wayne, IN 46835 USA.
NR 14
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2377-6943
BN 978-1-4673-1576-0; 978-1-4673-1577-7
J9 IEEE HIGH PERF EXTR
PY 2012
PG 6
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BFM10
UT WOS:000320462800005
ER
PT J
AU Beberniss, T
Eason, T
Spottswood, S
AF Beberniss, T.
Eason, T.
Spottswood, S.
BE Sas, P
Moens, D
Jonckheere, S
TI High-speed 3D digital image correlation measurement of long-duration
random vibration; recent advancements and noted limitations
SO PROCEEDINGS OF INTERNATIONAL CONFERENCE ON NOISE AND VIBRATION
ENGINEERING (ISMA2012) / INTERNATIONAL CONFERENCE ON UNCERTAINTY IN
STRUCTURAL DYNAMICS (USD2012)
LA English
DT Proceedings Paper
CT International Conference on Noise and Vibration Engineering (ISMA) /
International Conference on Uncertainty in Structural Dynamics (USD)
CY SEP 17-19, 2012
CL KU Leuven, Dept Mech Engn, Leuven, BELGIUM
HO KU Leuven, Dept Mech Engn
AB Results of a preliminary study on the application of high-speed three dimensional (3D) digital image correlation (DIC) to long-duration random vibration response measurement of compliant metallic structure typical of aircraft are presented. Various vibration test applications of dynamic DIC were investigated for accuracy and practicality, including modal identification, low-level dynamic strain measurement, and fatigue inducing high-level nonlinear random displacement response. Out-of-plane displacement response was measured with two high-speed charged coupled device (CCD) cameras and analyzed with 3D DIC software that has been modified to accommodate the required large volumes of digital images. Results were quantitatively compared to the more traditional measurement techniques of foil strain gages and laser Doppler vibrometry. Novel uses for high-level nonlinear random dynamic response DIC measurement were developed and verified while low-level modal identification testing is shown to be possible however, is very near the limit of current DIC dynamic range capabilities for most practical applications.
C1 [Beberniss, T.; Eason, T.; Spottswood, S.] US Air Force Res Lab, Struct Sci Ctr, Wright Patterson AFB, OH USA.
RP Beberniss, T (reprint author), US Air Force Res Lab, Struct Sci Ctr, Wright Patterson AFB, OH USA.
EM timothy.beberniss@wpafb.af.mil
NR 7
TC 1
Z9 1
U1 2
U2 2
PU KATHOLIEKE UNIV LEUVEN, DEPT WERKTUIGKUNDE
PI HEVERLEE
PA CELESTIJNENLAAN 300B, HEVERLEE, B-3001, BELGIUM
BN 978-90-73802-89-6
PY 2012
BP 1403
EP 1415
PG 13
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA BFR54
UT WOS:000321063901039
ER
PT B
AU Mertiny, P
Ruggles-Wrenn, MB
AF Mertiny, Pierre
Ruggles-Wrenn, Marina B.
BE Mertiny, P
TI 2011 ASME PRESSURE VESSELS AND PIPING CONFERENCE
SO PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE, VOL 3:
DESIGN AND ANALYSIS
LA English
DT Proceedings Paper
CT ASME Pressure Vessels and Piping Conference
CY JUL 17-21, 2011
CL Baltimore, MD
SP ASME, Pressure Vessels & Pip Div
C1 [Mertiny, Pierre] Univ Alberta, Edmonton, AB, Canada.
[Ruggles-Wrenn, Marina B.] US Air Force, Inst Technol, Wright Patterson AFB, OH USA.
RP Mertiny, P (reprint author), Univ Alberta, Edmonton, AB, Canada.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4453-3
PY 2012
BP 1
EP 1
PG 1
WC Engineering, Mechanical
SC Engineering
GA BFL08
UT WOS:000320340600001
ER
PT B
AU Rolling, AJ
Byerley, AR
Wisniewski, CF
AF Rolling, August J.
Byerley, Aaron R.
Wisniewski, Charles F.
GP ASME
TI INTEGRATING SYSTEMS ENGINEERING INTO THE USAF ACADEMY CAPSTONE GAS
TURBINE ENGINE COURSE
SO PROCEEDINGS OF THE ASME TURBO EXPO 2011, VOL 3
LA English
DT Proceedings Paper
CT ASME Turbo Expo 2011
CY JUN 06-10, 2011
CL Vancouver, CANADA
SP ASME, Int Gas Turbine Inst
AB This paper is intended to serve as a template for incorporating technical management majors into a traditional engineering design course. In 2002, the Secretary of the Air Force encouraged the USAF Academy to initiate a new interdisciplinary academic major related to systems engineering. This direction was given in an effort to help meet the Air Force's growing need for "systems" minded officers to manage the development and acquisition of its ever more complex weapons systems. The curriculum for the new systems engineering management (SEM) major is related to the "engineering of large, complex systems and the integration of the many subsystems that comprise the larger system" and differs in the level of technical content from the traditional engineering major. The program allows emphasis in specific cadet-selected engineering tracks with additional course work in human systems, operations research, and program management. Specifically, this paper documents how individual SEM majors have been integrated into aeronautical engineering design teams within a senior level capstone course to complete the preliminary design of a gas turbine engine. As the Aeronautical engineering (AE) cadets performed the detailed engine design, the SEM cadets were responsible for tracking performance, cost, schedule, and technical risk. Internal and external student assessments indicate that this integration has been successful at exposing both the AE majors and the SEM majors to the benefits of "systems thinking" by giving all the opportunity to employ SE tools in the context of a realistic aircraft engine design project.
C1 [Rolling, August J.; Byerley, Aaron R.; Wisniewski, Charles F.] USAF Acad, Usafa, CO USA.
RP Rolling, AJ (reprint author), USAF Acad, Usafa, CO USA.
NR 9
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5463-1
PY 2012
BP 525
EP 535
PG 11
WC Engineering, Mechanical
SC Engineering
GA BFQ42
UT WOS:000320967100052
ER
PT B
AU Rolling, AJ
AF Rolling, August J.
GP ASME
TI DESIGN, MODEL, AND VIRTUALLY FLY: INVESTIGATION OF THE B-1A CRUISE
PERFORMANCE WITH F101 ENGINES COMPARED WITH ITS RE-ENGINED PERFORMANCE
USING F119 ENGINES
SO PROCEEDINGS OF THE ASME TURBO EXPO 2011, VOL 3
LA English
DT Proceedings Paper
CT ASME Turbo Expo 2011
CY JUN 06-10, 2011
CL Vancouver, CANADA
SP ASME, Int Gas Turbine Inst
AB This paper examines application of AEDSYS and MATLAB design tools to virtually fly an engine in a platform through a mission. The primary objective of this effort was to develop the procedures for this process as an instructional tool. The secondary objective was application of the process to an actual case study, the re-engine of the B-1A. The resulting modular software uses performance data from engine models for the F101, F119, and a cadet designed engine built in AEDSYS; a B-1A drag polar model; as well as atmospheric and geospatial mapping tools available in MATLAB. The resulting simulation provides a relatable means of presenting this complicated information.
This tool gives the cadets the opportunity to virtually fly their engine. This visualization gives them full insight into how the integrated system performs. Aside from providing a great means of discussing many aspects for consideration in engine design, it also provides an incentive to develop a higher performance engine through competition.
C1 USAF Acad, Usafa, CO USA.
RP Rolling, AJ (reprint author), USAF Acad, Usafa, CO USA.
NR 4
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5463-1
PY 2012
BP 537
EP 545
PG 9
WC Engineering, Mechanical
SC Engineering
GA BFQ42
UT WOS:000320967100053
ER
PT B
AU Anthony, RJ
Clark, JP
Kennedy, SW
Finnegan, JM
Johnson, D
Hendershot, J
Downs, J
AF Anthony, Richard J.
Clark, John P.
Kennedy, Stephen W.
Finnegan, John M.
Johnson, Dean
Hendershot, James
Downs, James
GP ASME
TI FLEXIBLE NON-INTRUSIVE HEAT FLUX INSTRUMENTATION ON THE AFRL RESEARCH
TURBINE
SO PROCEEDINGS OF THE ASME TURBO EXPO 2011, VOL 5, PTS A AND B
LA English
DT Proceedings Paper
CT ASME Turbo Expo 2011
CY JUN 06-10, 2011
CL Vancouver, CANADA
SP ASME, Int Gas Turbine Inst
AB This paper describes a large scale heat flux instrumentation effort for the AFRL HIT Research Turbine. The work provides a unique amount of high frequency instrumentation to acquire fast response unsteady heat flux in a fully rotational, cooled turbine rig along with unsteady pressure data to investigate thermal loading and unsteady aerodynamic airfoil interactions. Over 1200 dynamic sensors are installed on the 1 & 1/2 stage turbine rig. Airfoils include 658 double-sided thin film gauges for heat flux, 289 fast-response Kulite pressure sensors for unsteady aerodynamic measurements, and over 40 thermocouples. An overview of the instrumentation is given with in-depth focus on the non-commercial thin film heat transfer sensors designed and produced in the Heat Flux Instrumentation Laboratory at WPAFB. The paper further describes the necessary upgrade of data acquisition systems and signal conditioning electronics to handle the increased channel requirements of the BIT Research Turbine. More modern, reliable, and efficient data processing and analysis code provides better handling of large data sets and allows easy integration with the turbine design and analysis system under development at AFRL. Example data from cooled transient blowdown tests in the TRF are included along with measurement uncertainty.
C1 [Anthony, Richard J.; Clark, John P.; Kennedy, Stephen W.; Finnegan, John M.] Air Force Res Lab, Turbine Branch, Prop Directorate, Wright Patterson AFB, OH USA.
RP Anthony, RJ (reprint author), Air Force Res Lab, Turbine Branch, Prop Directorate, Wright Patterson AFB, OH USA.
NR 34
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5465-5
PY 2012
BP 1793
EP 1803
PG 11
WC Engineering, Mechanical
SC Engineering
GA BFR71
UT WOS:000321076300159
ER
PT B
AU Scott-Emuakpor, O
George, T
Cross, C
Letcher, T
Wertz, J
Shen, MHH
AF Scott-Emuakpor, Onome
George, Tommy
Cross, Charles
Letcher, Todd
Wertz, John
Shen, M. -H. Herman
GP ASME
TI THE EFFECT OF HEAT GENERATION ON LOW CYCLE FATIGUE LIFE PREDICTION
SO PROCEEDINGS OF THE ASME TURBO EXPO 2011, VOL 6, PTS A AND B
LA English
DT Proceedings Paper
CT ASME Turbo Expo 2011
CY JUN 06-10, 2011
CL Vancouver, CANADA
SP ASME, Int Gas Turbine Inst
AB An energy-based life prediction method is used in this study to determine the fatigue life of tension-compression loaded components in the very low cycle regime between 10(2) and 10(4). The theoretical model for the energy-based prediction method was developed from the concept that the strain energy accumulated during both monotonic failure and an entire fatigue process are equal; In other words, the scalar quantity of strain energy accumulated during monotonic failure is a physical damage quantity that correlates to fatigue as well. The energy-based method has been successfully applied to fatigue life prediction of components failing in the fatigue regime between 10(4) and 10(7) cycles. To assess Low Cycle Fatigue (LCF) with the prediction method, a clearer understanding of energy dissipation through heat, system vibration, damping, surface defects and acoustics were necessary. The first of these topics analyzed is heat. The analysis conducted studies the effect of heat generated during cyclic loading and heat loss from slipping at the interface of the grip wedges of the servo-hydraulic load frame and the test specimen. The reason for the latter is to address the notion that slippage in the experimental setup may be the cause of the reduction in the accuracy of the energy-based prediction method for LCF, which was seen in previous research. These analyses were conducted on Titanium 6A1-4V, where LCF experimental data for stress ratios R=-1 and R=-0.813 were compared with the energy-based life prediction method. The results show negligible effect on both total and cyclic energy from heat generation at the interface of the grip wedges and heat generation in the fatigue zone of the specimen.
C1 [Scott-Emuakpor, Onome; George, Tommy; Cross, Charles] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Scott-Emuakpor, O (reprint author), USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
EM onome.scott-emuakpor@wpafb.af.mil
NR 13
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5466-2
PY 2012
BP 1
EP 9
PG 9
WC Engineering, Mechanical
SC Engineering
GA BFS59
UT WOS:000321160200001
ER
PT B
AU Marks, C
Sondergaard, R
Wolff, M
Anthony, R
AF Marks, Christopher
Sondergaard, Rolf
Wolff, Mitch
Anthony, Rich
GP ASME
TI EXPERIMENTAL COMPARISON OF DBD PLASMA ACTUATORS FOR LOW REYNOLDS NUMBER
SEPARATION CONTROL
SO PROCEEDINGS OF THE ASME TURBO EXPO 2011, VOL 7, PTS A-C
LA English
DT Proceedings Paper
CT ASME Turbo Expo 2011
CY JUN 06-10, 2011
CL Vancouver, CANADA
SP ASME, Int Gas Turbine Inst
ID VORTEX-GENERATOR JETS; LOW-PRESSURE TURBINE; FLOW-CONTROL;
ATMOSPHERIC-PRESSURE; MECHANISMS; RESPONSES; AIR
AB This paper presents experimental work comparing several Dielectric Barrier Discharge (DBD) plasma actuator configurations for low Reynolds number separation control. Actuators studied here are being investigated for use in a closed loop separation control system. The plasma actuators were fabricated in the U. S. Air Force Research Laboratory Propulsion Directorate's thin film laboratory and applied to a low Reynolds number airfoil that exhibits similar suction surface behavior to those observed on Low Pressure (LP) Turbine blades. In addition to typical asymmetric arrangements producing downstream jets, one electrode configurations was designed to produce an array of off axis jets, and one produced a spanwise array of linear vertical jets in order to generate voracity and improved boundary layer to fivestream mixing. The actuators were installed on an airfoil and their performance compared by flow visualization, surface stress sensitive film (S3F), and drag measurements. The experimental data provides a clear picture of the potential utility of each design. Experiments were carried out at four Reynolds numbers, 1.4x10(5), 1.0 x 10(5), 6.0 x 10(4), and 5.0 x 10(4) at a -1.5 degrees angle of attack. Data was taken at the AFRL Propulsion Directorate's Low Speed Wind Tunnel (LSWT) facility.
C1 [Marks, Christopher; Sondergaard, Rolf; Wolff, Mitch; Anthony, Rich] US Air Force Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Marks, C (reprint author), US Air Force Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
NR 40
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-5467-9
PY 2012
BP 581
EP 594
PG 14
WC Engineering, Mechanical
SC Engineering
GA BFS60
UT WOS:000321160300049
ER
PT S
AU Hack, DE
Patton, LK
Himed, B
Saville, MA
AF Hack, Daniel E.
Patton, Lee K.
Himed, Braham
Saville, Michael A.
BE Matthews, MB
TI On the Applicability of Source Localization Techniques to Passive
Multistatic Radar
SO 2012 CONFERENCE RECORD OF THE FORTY SIXTH ASILOMAR CONFERENCE ON
SIGNALS, SYSTEMS AND COMPUTERS (ASILOMAR)
SE Conference Record of the Asilomar Conference on Signals Systems and
Computers
LA English
DT Proceedings Paper
CT 46th Asilomar Conference on Signals, Systems and Computers
CY NOV 04-07, 2012
CL Pacific Grove, CA
SP Naval Postgraduate Sch, ATK Miss Res, IEEE Signal Proc Soc
AB The source localization problem concerns the detection and localization of an emitter whose transmission is observed by geographically separated receivers. The passive multistatic radar (PMR) problem concerns the detection and localization of a target that scatters an illumination signal to geographically separated receivers. By modeling the scattering target as an emitter, the techniques of source localization can be applied to the PMR problem. Indeed, this approach has recently been introduced in the literature. However, the exact relationship between the two problems has not been made explicit. In this work, we derive a centralized generalized likelihood ratio test (GLRT) detector that performs the processing characteristic of both source localization and PMR. This detector is used to assess the relative detection benefit provided by source localization in PMR. We show that source localization techniques are of limited utility in PMR due to the SNR regimes of the target-scattered and direct-path signals typical of the PMR signal environment.
C1 [Hack, Daniel E.; Patton, Lee K.] Matrix Res Inc, Beavercreek, OH 45432 USA.
[Himed, Braham; Saville, Michael A.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Hack, Daniel E.; Saville, Michael A.] Air Force Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
RP Hack, DE (reprint author), Matrix Res Inc, Beavercreek, OH 45432 USA.
EM dan.hack@matrixresearch.com; lee.patton@matrixresearch.com;
braham.himed@wpafb.af.mil; michael.saville@wpafb.af.mil
NR 8
TC 2
Z9 2
U1 0
U2 3
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1058-6393
BN 978-1-4673-5051-8
J9 CONF REC ASILOMAR C
PY 2012
BP 848
EP 852
PG 5
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BFO76
UT WOS:000320768400156
ER
PT B
AU Anderson, EK
Hoke, JL
Schauer, FR
AF Anderson, Eric K.
Hoke, John L.
Schauer, Fred R.
GP ASME
TI STUDY OF A THERMAL BARRIER COATING IN A PULSED DETONATION ENGINE
SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS
AND EXPOSITION - 2010, VOL 1
LA English
DT Proceedings Paper
CT ASME International Mechanical Engineering Congress and Exposition
(IMECE)
CY NOV 12-18, 2010
CL Vancouver, CANADA
SP Amer Soc Mech Engineers
AB A pulse detonation engine (PDE) works by establishing regular purge-detonation cycles. During a cycle, a point inside the detonation tube downstream of the ignition source is exposed to extreme high temperature briefly as the detonation wave passes, followed by near room temperature purge gas. As is the case for many combustion systems, minimizing unwanted heat loss in a PDE is important to maximizing efficiency. For this reason, the effect of coating the inner wall of a detonation tube with a thin, low thermal conductivity coating was studied experimentally and computationally. A three inch diameter 304 stainless steel detonation tube with 1.65 mm wall thickness was coated on the inside with a 0.635 mm thick layer of 93% Zirconium Oxide and 7% Yttrium Oxide.
Experimental results were obtained operating the PDE at a frequency of 10 Hz. Temperature was measured at four points on the exterior of the detonation tube between 33 and 45 inches downstream of the ignition source. At all locations measured, the exterior tube temperature would rise from an initial ambient temperature faster with the uncoated tube until a crossover point approximately 1000-1500 cycles after the start of the experiment. After this cross over point, outer wall temperature was higher for the coated tubes, which at this point was increasing faster for the tube with the thermal barrier.
To better understand the physical reason why the insulated tube always reached a higher temperature after roughly 1000 cycles, a simplified computational model was created using a time-dependent, one-dimensional, implicit finite difference method to calculate the temperature at 20 evenly spaced nodes. The temperature profile of the tube was assumed to vary only radially, so the interior points were solved using the transient one-dimensional heat conduction equation. One dimensional convection boundaries were applied at the inner and outer walls of the tube. Boundary conditions of increasing complexity were applied, beginning with a constant temperature, natural convection condition at the outer wall and a forced convection boundary condition at the inner wall with a step change in temperature to simulate the detonation wave.
Experimentally measured wall temperatures are presented and compared to computationally obtained temperature profiles. The focus is on understanding the physical reason for the behavior of the insulated tubes.
C1 [Anderson, Eric K.] CNR, Dayton, OH 45431 USA.
[Hoke, John L.] Innovat Sci Solut, Dayton, OH 45435 USA.
[Schauer, Fred R.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Anderson, EK (reprint author), CNR, Dayton, OH 45431 USA.
EM eric.anderson@wpafb.af.mil; john.hoke@wpafb.af.mil;
frederick.schauer@wpafb.af.mil
FU National Research Council; Air Force propulsion directorate; Air Force
Office of Scientific Research
FX The authors would like to extend their thanks to Curtis Rice and
Christopher Stevens for technical support. Funding was provided by the
National Research Council, the Air Force propulsion directorate, and the
Air Force Office of Scientific Research.
NR 11
TC 0
Z9 0
U1 0
U2 1
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4425-0
PY 2012
BP 113
EP +
PG 4
WC Engineering, Aerospace; Engineering, Mechanical
SC Engineering
GA BFJ67
UT WOS:000320140100013
ER
PT B
AU Scott-Emuakpor, O
George, T
Cross, C
AF Scott-Emuakpor, Onome
George, Tommy
Cross, Charles
GP ASME
TI Geometric Optimization of Crack Arresting Holes in an Operational
Component
SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS
AND EXPOSITION (IMECE 2010), VOL 9
LA English
DT Proceedings Paper
CT ASME International Mechanical Engineering Congress and Exposition
(IMECE)
CY NOV 12-18, 2010
CL Vancouver, CANADA
SP Amer Soc Mech Engineers
AB Crack-growth arrest is analyzed in this study with the simulation of real-life fatigue of a structure during service. Unlike conventional crack-growth arrest studies, this research does not analyze an opening mode (Mode I) crack extension from an induced crack-tip specimen. The work in this analysis focuses on designing drill-holes into a structure, without a preexisting crack, that will operate under cyclic loads. The purpose of the holes is to prevent through-crack propagation if a crack initiates during service of the structure. Prevention reduces the possibility of a phenomenon. like Foreign Object Damage (FOD) by a fragment of a fractured structure in heavy operating machinery and over-looked cracks during routine inspections.
The drill-hole design procedure for crack growth arrest explores the use of two, three and four-hole configurations as well as the effect of inserting hard Viton-rubber pins into each drill hole of a square plate test specimen. Each specimen configuration is geometrically designed with the following in mind: minimized the hole-to-fatigue zone stress ratio, minimize damping loss between the original and the new designs with holes and pins, and experimentally validating the theory of the crack arresting methods. The geometric optimization for the square plate specimen was developed in accordance with a vibration-based fatigue testing method for uniaxial bending, which is the benchmark method for this study.
C1 [Scott-Emuakpor, Onome; George, Tommy; Cross, Charles] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
RP Scott-Emuakpor, O (reprint author), USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
EM onome.scott-emuakpor@wpafb.af.mil
NR 8
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4446-5
PY 2012
BP 57
EP 64
PG 8
WC Engineering, Mechanical; Mechanics
SC Engineering; Mechanics
GA BFM23
UT WOS:000320481000008
ER
PT B
AU Breitzman, TD
Iarve, EV
Ripberger, ER
AF Breitzman, T. D.
Iarve, E. V.
Ripberger, E. R.
GP ASME
TI OPTIMAL DESIGN OF A COMPOSITE SCARF REPAIR PATCH UNDER TENSILE LOADING
SO PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS
AND EXPOSITION 2010, VOL 3, PTS A AND B
LA English
DT Proceedings Paper
CT ASME International Mechanical Engineering Congress and Exposition
(IMECE)
CY NOV 12-18, 2010
CL Vancouver, CANADA
SP Amer Soc Mech Engineers
AB Mechanics of the composite scarf repair under tensile loading with and without overlay plies was examined for nontraditional patch ply orientations. Three-dimensional nonlinear analysis was performed for repair failure prediction and good baseline comparison for open-hole scarfed panels and panels repaired by using standard ply-by-ply replacement patch composition was achieved. Multidimensional optimization was performed to calculate the repair patch ply orientations which minimize the von Mises stresses in the adhesive. These optimal stacking sequences achieved significant reduction of the stress levels and resulted in predicted up to 75% and 85% strength restoration for flush and single ply thickness over-ply repair. These results are intended to illustrate additional design variables available for efficient composite repair design, namely the composition of the repair patch.
C1 [Breitzman, T. D.; Ripberger, E. R.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Breitzman, TD (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 6
TC 0
Z9 0
U1 0
U2 3
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4427-4
PY 2012
BP 269
EP 271
PG 3
WC Engineering, Manufacturing; Engineering, Mechanical
SC Engineering
GA BFK76
UT WOS:000320286400034
ER
PT B
AU Walls, KC
Littlefield, DL
Lambert, DE
AF Walls, Kenneth C.
Littlefield, David L.
Lambert, David E.
BE Papadakis, G
TI ON DETERMINING CONDITIONS FOR OPTIMAL PERFORMANCE OF CASED MUNITIONS
SO PROCEEDINGS OF THE ASME PRESSURE VESSELS AND PIPING CONFERENCE
(PVP-2011), VOL 4
LA English
DT Proceedings Paper
CT ASME Pressure Vessels and Piping Conference
CY JUL 17-21, 2011
CL Baltimore, MD
SP ASME, Pressure Vessels & Pip Div
AB In order to make the process of fragmentation of warhead cases more systematic, we have developed a procedure that makes use of nonlinear optimization to derive optimal values for case design parameters subject to various design constraints. A framework has been developed that makes use of the optimization software package LS-OPT driving the hydrocode CTH (CTH is developed and maintained at Sandia National Laboratories, LS-OPT is commercially available from Livermore Software Technology Corp.). CTH was used to model the explosive detonation and determine the resultant kinetic energy delivered to the case by the energetic material. In this follow-on effort to a previous study [1], the range of constraints and free parameters used in the optimization study was expanded.
C1 [Walls, Kenneth C.; Littlefield, David L.] Univ Alabama Birmingham, Dept Mech Engn, Birmingham, AL 35294 USA.
[Lambert, David E.] US Air Force, Res Lab, Eglin AFB, FL USA.
RP Walls, KC (reprint author), Univ Alabama Birmingham, Dept Mech Engn, Birmingham, AL 35294 USA.
FU Air Force Research Laboratory
FX This work was supported by the Air Force Research Laboratory.
NR 4
TC 0
Z9 0
U1 0
U2 0
PU AMER SOC MECHANICAL ENGINEERS
PI NEW YORK
PA THREE PARK AVENUE, NEW YORK, NY 10016-5990 USA
BN 978-0-7918-4454-0; 978-0-7918-4454-0
PY 2012
BP 461
EP +
PG 2
WC Engineering, Mechanical
SC Engineering
GA BFL57
UT WOS:000320410300056
ER
PT S
AU Wang, LH
Shen, CC
Seetharaman, G
Palaniappan, K
Bhattacharyya, SS
AF Wang, Lai-Huei
Shen, Chung-Ching
Seetharaman, Gunasekaran
Palaniappan, Kannappan
Bhattacharyya, Shuvra S.
GP IEEE
TI MULTIDIMENSIONAL DATAFLOW GRAPH MODELING AND MAPPING FOR EFFICIENT GPU
IMPLEMENTATION
SO 2012 IEEE WORKSHOP ON SIGNAL PROCESSING SYSTEMS (SIPS)
SE IEEE Workshop on Signal Processing
LA English
DT Proceedings Paper
CT IEEE Workshop on Signal Processing Systems (SiPS)
CY OCT 17-19, 2012
CL Quebec City, CANADA
SP IEEE, IEEE Signal Processing Soc, Marvell, IEEE Circuits & Syst Soc (CAS), IEEE Comp Soc
DE Dataflow graph; multidimensional synchronous dataflow; graphics
processing unit; integral histogram
ID SYNCHRONOUS DATA-FLOW; DSP SYSTEMS
AB Multidimensional synchronous dataflow (MDSDF) provides an effective model of computation for a variety of multidimensional DSP systems that have static dataflow structures. In this paper, we develop new methods for optimized implementation of MDSDF graphs on embedded platforms that employ multiple levels of parallelism to enhance performance at different levels of granularity. Our approach allows designers to systematically represent and transform multi-level parallelism specifications from a common, MDSDF-based application level model. We demonstrate our methods with a case study of image histogram implementation on a graphics processing unit (GPU). Experimental results from this study show that our approach can be used to derive fast GPU implementations, and enhance trade-off analysis during design space exploration.
C1 [Wang, Lai-Huei; Shen, Chung-Ching; Bhattacharyya, Shuvra S.] Univ Maryland, Dept Elect & Comp Engn, College Pk, MD 20742 USA.
[Seetharaman, Gunasekaran] Air Force Res Lab, Rome, NY USA.
[Palaniappan, Kannappan] Univ Missouri Columbia, Columbia, MD USA.
RP Wang, LH (reprint author), Univ Maryland, Dept Elect & Comp Engn, College Pk, MD 20742 USA.
EM laihuei@umd.edu; ccshen@umd.edu; Gunasekaran.Seetharaman@rl.af.mil;
palaniappank@missouri.edu; ssb@umd.edu
OI Bhattacharyya, Shuvra/0000-0001-7719-1106
FU US Air Force Research Laboratory (AFRL); Laboratory for
Telecommunication Sciences (LTS)
FX The authors acknowledge the Government's support in the publication of
this paper. The material is based upon work funded by the US Air Force
Research Laboratory (AFRL), and Laboratory for Telecommunication
Sciences (LTS). Any opinions, findings, and conclusions or
recommendations expressed in this article are those of the authors and
do not reflect the views of AFRL or LTS.
NR 15
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2162-3562
BN 978-0-7695-4856-2; 978-1-4673-2986-6
J9 IEEE WORKSHOP SIG
PY 2012
BP 300
EP 305
DI 10.1109/SiPS.2012.10
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BFE21
UT WOS:000319344000052
ER
PT S
AU Kambouro, KE
Nguyen, DD
Kouhestani, C
Devine, RAB
AF Kambouro, K. E.
Nguyen, D. D.
Kouhestani, C.
Devine, R. A. B.
GP IEEE
TI Measurement and Modeling of Duty-Cycle Effects Due to NBTI
SO 2012 IEEE INTERNATIONAL INTEGRATED RELIABILITY WORKSHOP FINAL REPORT
SE IEEE International Integrated Reliability Workshop Final Report
LA English
DT Proceedings Paper
CT IEEE International Integrated Reliability Workshop (IIRW)
CY OCT 14-18, 2012
CL S Lake Tahoe, CA
SP IEEE, IEEE Electron Devices Soc (EDS), IEEE Reliabil Soc
AB One of the most important requirements for modeling of the long-term effects of negative bias temperature instability (NBTI) on device/circuit response is an understanding of how to include the effect of duty cycle on the threshold voltage shift. Since NBTI is known to be comprised of both permanent and recoverable components, a measurement protocol must be established enabling separation of these components and then their recombination to predict the shift for different duty cycles. In the work reported here, we have endeavored to address these issues by combining pulsed and pseudo-DC stressing/relaxation methods.
C1 [Kambouro, K. E.] USAF, Res Lab, Space Vehicles Directorate, OSAIC, Kirtland AFB, NM USA.
[Nguyen, D. D.; Kouhestani, C.] USAF, Res Lab, Space Vehicles Directorate, COSMIAC, Kirtland AFB, NM USA.
[Devine, R. A. B.] USAF, Res Lab, Space Vehicles Directorate, Think Strategically, Kirtland AFB, NM USA.
RP Kambouro, KE (reprint author), USAF, Res Lab, Space Vehicles Directorate, OSAIC, Kirtland AFB, NM USA.
FU U.S. Air Force; United States Air Force Air Force Material Command;
Kirtland Air Force Base [N.M. 87117-5776]; Air Force Research Laboratory
[FA9453-08 2-0259]
FX The work performed by K. Kambour was supported by the U.S. Air Force
under a contract sponsored, monitored, and managed by United States Air
Force Air Force Material Command, Air Force Research Laboratory, Space
Vehicles Directorate, Kirtland Air Force Base, N.M. 87117-5776.; Duc
Nguyen's and Camron Kouhestani's work is sponsored by the Air Force
Research Laboratory under agreement number FA9453-08 2-0259
NR 8
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1930-8841
BN 978-1-4673-2752-7; 978-1-4673-2749-7
J9 INT INTEG REL WRKSP
PY 2012
BP 136
EP 139
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BFE19
UT WOS:000319340400039
ER
PT S
AU McDonald, NR
Bishop, SM
Cady, NC
AF McDonald, N. R.
Bishop, S. M.
Cady, N. C.
GP IEEE
TI Experimentally Demonstrated Filament-based Switching Mechanism for
Al/CuxO/Cu Memristive Devices
SO 2012 IEEE INTERNATIONAL INTEGRATED RELIABILITY WORKSHOP FINAL REPORT
SE IEEE International Integrated Reliability Workshop Final Report
LA English
DT Proceedings Paper
CT IEEE International Integrated Reliability Workshop (IIRW)
CY OCT 14-18, 2012
CL S Lake Tahoe, CA
SP IEEE, IEEE Electron Devices Soc (EDS), IEEE Reliabil Soc
ID NONVOLATILE MEMORY APPLICATION; RESISTIVE MEMORY; CUXO FILMS
AB Al/CuxO/Cu memristive devices created via a plasma oxidation step have previously demonstrated complete nonpolar switching behavior [1]. An additional material contamination control measure resulted in improved uniformity of I-V curve behavior but necessitated an initial forming step in most devices. The operation voltages were irrespective of switching style and top electrode (TE) size. The high resistance state resistance increased with decreasing TE size; the low resistance state resistance remained invariant. Lateral switching of memristive device pairs unambiguously indicated filament-based device switching. A voltage-driven CuxO filament composition modulation switching mechanism is suggested instead of the popular Joule heating RESET mechanism.
C1 [McDonald, N. R.] USAF, Res Lab, Informat Directorate, Griffiss AFB, NY 13441 USA.
[Bishop, S. M.; Cady, N. C.] Univ Albany, Coll Nanoscale Sci & Engn, Albany, NY USA.
RP McDonald, NR (reprint author), USAF, Res Lab, Informat Directorate, Griffiss AFB, NY 13441 USA.
FU United States Air Force Research Laboratory; Information Directorate in
Rome, NY
FX This work was supported by the United States Air Force Research
Laboratory, Information Directorate in Rome, NY. This research was
conducted in collaboration with the college of Nanoscale Science and
Engineering, Albany, NY.
NR 10
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1930-8841
BN 978-1-4673-2752-7; 978-1-4673-2749-7
J9 INT INTEG REL WRKSP
PY 2012
BP 195
EP 198
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BFE19
UT WOS:000319340400054
ER
PT S
AU Schneider, S
Hawkins, T
Ahmed, Y
Deplazes, S
Mills, J
AF Schneider, Stefan
Hawkins, Tom
Ahmed, Yonis
Deplazes, Stephan
Mills, Jeff
BE Visser, AE
Bridges, NJ
Rogers, RD
TI Ionic Liquid Fuels for Chemical Propulsion
SO IONIC LIQUIDS: SCIENCE AND APPLICATIONS
SE ACS Symposium Series
LA English
DT Proceedings Paper
CT Symposium on Ionic Liquids: Science and Applications / 243rd National
American-Chemical-Society Meeting
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Ind & Engn Chem
ID HYPERGOLIC FUELS; DICYANAMIDE; NITROCYANAMIDE; DECOMPOSITION; IGNITION;
MELAMINE
AB The ionic liquid (IL) program at the Air Force Research Laboratory is investigating tailored energy-dense liquids to provide a scientific foundation for the advancement of the performance and operability envelopes of current propulsion systems. General efforts focus on the discovery of energetic ILs based on heterocyclic and open-chain cations in combination with reactive anions. A major goal has been the development of IL fuels which undergo hypergolic ignition upon contact with common propulsion oxidizers. This account discusses the combination of some azolium, ammonium, hydrazinium, guanidinium and hydrazidinium cations with dicyanamide, nitrocyanamide, cyanoureate, nitrate, azide and tricyanomethanide anions. Their synthesis and characterization are described along with results of simple hypergolicity drop tests. The utility and reproducibility of these tests and possible mechanistic scenarios for these reactions are also discussed.
C1 [Schneider, Stefan; Hawkins, Tom; Ahmed, Yonis; Deplazes, Stephan; Mills, Jeff] USAF, Res Lab, Edwards Afb, CA 93524 USA.
RP Schneider, S (reprint author), USAF, Res Lab, 10 E Saturn Blvd, Edwards Afb, CA 93524 USA.
EM stefan.schneider@edwards.af.mil
NR 48
TC 7
Z9 7
U1 0
U2 7
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 USA
SN 0097-6156
BN 978-0-8412-2763-7
J9 ACS SYM SER
JI ACS Symp. Ser.
PY 2012
VL 1117
BP 1
EP 25
PG 25
WC Chemistry, Applied; Engineering, Chemical
SC Chemistry; Engineering
GA BFA68
UT WOS:000319021900001
ER
PT S
AU Prince, BD
Fritz, BA
Chiu, YH
AF Prince, Benjamin D.
Fritz, Bruce A.
Chiu, Yu-Hui
BE Visser, AE
Bridges, NJ
Rogers, RD
TI Ionic Liquids in Electrospray Propulsion Systems
SO IONIC LIQUIDS: SCIENCE AND APPLICATIONS
SE ACS Symposium Series
LA English
DT Proceedings Paper
CT Symposium on Ionic Liquids - Science and Applications / 243rd National
Spring Meeting of the American-Chemical-Society
CY MAR 25-29, 2012
CL San Diego, CA
SP Amer Chem Soc, Div Ind & Engn Chem, Amer Chem Soc
ID EMITTERS; SOLVENTS; METALS
AB This chapter provides a brief introduction to the use of ionic liquids in electric space propulsion systems. Pertinent performance parameters and recent advances in the use of ionic liquids in electrospray propulsion applications are described. Future use and development of these systems requires a combination of experimental investigation and modeling efforts. A theoretical investigation using atomistic molecular dynamics for an ionic liquid, 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, is presented. A mass spectrometric study of 2-hydroxyethylhydrazinium nitrate energetic ionic liquid emitted from an externally wetted titanium emitter is presented.
C1 [Prince, Benjamin D.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Fritz, Bruce A.] Space & Missile Syst Ctr, Def Weather Syst Directorate, Los Angeles, CA 90245 USA.
[Chiu, Yu-Hui] US Air Force, Res Lab, Space Vehicles Directorate, Hanscom AFB, MA 01731 USA.
[Chiu, Yu-Hui] Busek Co Inc, Natick, MA 01760 USA.
RP Prince, BD (reprint author), USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
EM benjamin.prince@kirtland.af.mil
OI Fritz, Bruce/0000-0003-0588-8558
FU AFOSR [2303EP02]
FX This work has been supported by AFOSR through task 2303EP02 (Program
Manager: Michael Berman). The authors thank P. Tiruppathi and E. J.
Maginn for their contributions to the MD investigations for this
chapter.
NR 48
TC 0
Z9 0
U1 0
U2 6
PU AMER CHEMICAL SOC
PI WASHINGTON
PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 USA
SN 0097-6156
BN 978-0-8412-2763-7
J9 ACS SYM SER
JI ACS Symp. Ser.
PY 2012
VL 1117
BP 27
EP +
PG 5
WC Chemistry, Applied; Engineering, Chemical
SC Chemistry; Engineering
GA BFA68
UT WOS:000319021900002
ER
PT J
AU Gluck, KA
McNamara, JM
Brighton, H
Dayan, P
Kareev, Y
Krause, J
Kurzban, R
Selten, R
Stevens, JR
Voelkl, B
Wimsatt, WC
AF Gluck, Kevin A.
McNamara, John M.
Brighton, Henry
Dayan, Peter
Kareev, Yaakov
Krause, Jens
Kurzban, Robert
Selten, Reinhard
Stevens, Jeffrey R.
Voelkl, Bernhard
Wimsatt, William C.
BE Hammerstein, P
Stevens, JR
TI Robustness in a Variable Environment
SO EVOLUTION AND THE MECHANISMS OF DECISION MAKING
SE Strungmann Forum Reports
LA English
DT Article; Book Chapter
AB Robustness is a prominent concept in technical sciences and engineering. It has also been recognized as an important principle in evolutionary biology. In this chapter, it is proposed that the term "robustness" be used to characterize the extent to which a natural or artificial system can maintain its function when facing perturbation and that this concept is relevant in considerations of Darwinian decision theory. Situations in which the action of natural selection is liable to lead to the evolution of robust behavioral strategies are highlighted along with some psychological mechanisms that might lead to robust decision-making processes. Robustness describes a property of a system varying on a continuous scale rather than existing as a dichotomous feature. Degree of robustness depends on the details of the interaction of system characteristics and environmental contingencies, as well as the specific types and extents of perturbations to which the system may be subjected. A system can be robust in one domain while remaining highly vulnerable to perturbations in others. As defined here, robustness is related to, yet distinct from, flexibility and optimality. The sorts of environmental variation, and hence perturbations, that an organism or technology is liable to face are described, as is the cost-benefit trade-off of robustness. Finally, the robustness of decision making at the level of social groups is considered.
C1 [Gluck, Kevin A.] USAF, Res Lab, Human Effectiveness Directorate, Wright Patterson AFB, OH 45433 USA.
[McNamara, John M.] Univ Bristol, Dept Math, Bristol BS8 1TW, Avon, England.
[Brighton, Henry] Max Planck Inst Human Dev, Ctr Adapt Behav & Cognit, D-14195 Berlin, Germany.
[Dayan, Peter] UCL, Gatsby Computat Neurosci Unit, London WC1N 3AR, England.
[Kareev, Yaakov] Hebrew Univ Jerusalem, Ctr Study Rat, IL-91904 Jerusalem, Israel.
[Krause, Jens] IGB, Abt Biol & Okol Fische 4, D-12587 Berlin, Germany.
[Kurzban, Robert] Univ Penn, Dept Psychol, Philadelphia, PA 19104 USA.
[Selten, Reinhard] Univ Bonn, Juridicum, D-53113 Bonn, Germany.
[Stevens, Jeffrey R.] Univ Nebraska Lincoln, Dept Psychol, Lincoln, NE 68588 USA.
[Voelkl, Bernhard] Humboldt Univ, Inst Theoret Biol, D-10115 Berlin, Germany.
[Wimsatt, William C.] Univ Chicago, Dept Philosophy, Chicago, IL 60637 USA.
RP Gluck, KA (reprint author), USAF, Res Lab, Human Effectiveness Directorate, Wright Patterson AFB, OH 45433 USA.
RI Stevens, Jeffrey/C-4619-2011
OI Stevens, Jeffrey/0000-0003-2375-1360
NR 0
TC 1
Z9 1
U1 0
U2 1
PU MIT PRESS
PI CAMBRIDGE
PA FIVE CAMBRIDGE CENTER, CAMBRIDGE, MA 02142 USA
BN 978-0-262-01808-1
J9 STRUNGMANN FORUM REP
PY 2012
BP 195
EP 214
PG 20
WC Neurosciences
SC Neurosciences & Neurology
GA BEW55
UT WOS:000318407800013
ER
PT B
AU Kahn, L
AF Kahn, Leonard
BE Kahn, L
TI Introduction: Mill on Justice
SO MILL ON JUSTICE
LA English
DT Editorial Material; Book Chapter
RP Kahn, L (reprint author), USAF Acad, Colorado Springs, CO 80840 USA.
NR 38
TC 0
Z9 0
U1 0
U2 0
PU PALGRAVE
PI BASINGSTOKE
PA HOUNDMILLS, BASINGSTOKE RG21 6XS, ENGLAND
BN 978-0-230-35497-5
PY 2012
BP 1
EP 17
PG 17
WC Philosophy
SC Philosophy
GA BEU57
UT WOS:000318219700001
ER
PT B
AU Kahn, L
AF Kahn, Leonard
BE Kahn, L
TI The Objection from Justice and the Conceptual/Substantive Distinction
SO MILL ON JUSTICE
LA English
DT Article; Book Chapter
RP Kahn, L (reprint author), USAF Acad, Colorado Springs, CO 80840 USA.
NR 51
TC 0
Z9 0
U1 0
U2 0
PU PALGRAVE
PI BASINGSTOKE
PA HOUNDMILLS, BASINGSTOKE RG21 6XS, ENGLAND
BN 978-0-230-35497-5
PY 2012
BP 198
EP 220
PG 23
WC Philosophy
SC Philosophy
GA BEU57
UT WOS:000318219700010
ER
PT J
AU Canciani, A
Raquet, J
AF Canciani, Aaron
Raquet, John
GP ION
TI Integration of Cold Atom Interferometry INS with other Sensors
SO PROCEEDINGS OF THE 2012 INTERNATIONAL TECHNICAL MEETING OF THE INSTITUTE
OF NAVIGATION
LA English
DT Proceedings Paper
CT International Technical Meeting (ITM) of the Institute-of-Navigation
(ION)
CY JAN 30-FEB 01, 2012
CL Newport Beach, CA
SP Inst Nav (ION)
AB Inertial navigation systems (INS) using cold-atom interferometry are currently under development. According to Jekeli and others, these systems will have error parameters three or four orders of magnitude more accurate than current navigation grade INS. This significant increase in accuracy motivates the need to explore how these high accuracy inertial navigation systems can be integrated with other sensors. This paper focuses on methods of integrating cold atom interferometry INS with conventional navigation grade INS, as well as with GPS. First, a framework for integrating cold atom INS systems with conventional INS systems is presented. In this framework, the navigation grade INS is used to obtain the position, velocity, and attitude solution. Cold atom INS measurements, as well as navigation grade INS measurements, are then brought into a Kalman Filter which estimates the errors in the navigation solution. The filter increases navigation accuracy by estimating the various error parameters of the navigation grade INS, such as biases and scale factors, which are modeled as states in the filter. The high accuracy of the cold atom interferometry INS measurements provides observability of these states.
This paper then presents the results of an aircraft simulation using the proposed approach. Periodic outages are created in the cold atom interferometry INS that coincide with high dynamic maneuvers. The filter successfully estimates the navigation grade INS error states, such as biases and scale factors. This allows the final navigation solution to remain over an order of magnitude more accurate than the navigation grade INS solution alone, despite the fact that the cold atom interferometry INS is experiencing frequent outages.
Next, the paper describes an approach for integrating cold atom interferometry INS with GPS. The proposed approach is a conventional loosely coupled INS - GPS. The cold atom interferometry INS is used to estimate the navigation solution with periodic GPS measurements being brought into a Kalman Filter to estimate the errors in the INS solution. The results of an aircraft simulation are then presented in order to analyze the effects of various length GPS outages. The errors using a cold atom interferometry INS are then compared to the errors of a navigation grade INS integrated in the same way. Conclusions are drawn on acceptable GPS outage times as well as improvements in overall navigation performance obtained by the use of a cold atom interferometry INS.
C1 [Canciani, Aaron; Raquet, John] USAF, Inst Technol, Colorado Springs, CO 80840 USA.
RP Canciani, A (reprint author), USAF, Inst Technol, Colorado Springs, CO 80840 USA.
NR 7
TC 0
Z9 0
U1 0
U2 3
PU INST NAVIGATION
PI WASHINGTON
PA 815 15TH ST NW, STE 832, WASHINGTON, DC 20005 USA
PY 2012
BP 151
EP 161
PG 11
WC Remote Sensing
SC Remote Sensing
GA BER53
UT WOS:000317865600012
ER
PT B
AU Ramsey, BW
Mullins, BE
White, ED
AF Ramsey, Benjamin W.
Mullins, Barry E.
White, Edward D.
BE Pfeifer, T
Jayasumana, A
Turgut, D
TI Improved Tools for Indoor ZigBee Warwalking
SO PROCEEDINGS OF THE 37TH ANNUAL IEEE CONFERENCE ON LOCAL COMPUTER
NETWORKS (LCN 2012)
LA English
DT Proceedings Paper
CT 37th Annual IEEE Conference on Local Computer Networks (LCN)
CY OCT 22-25, 2012
CL Clearwater, FL
SP IEEE, IEEE Comp Soc
DE ZigBee; wireless sensor networks; security
ID SENSOR NETWORKS; RSSI
AB Secure ZigBee wireless sensor and control networks use 128-bit AES encryption to defend against message sniffing and unauthorized access. However, the low cost and low complexity of ZigBee devices makes them vulnerable to physical attacks such as tampering and network key extraction. Network administrators and penetration testers require tools such as Zbfind to accurately locate ZigBee hardware and evaluate physical security. The open source Zbfind tool estimates distance to ZigBee devices in real time using received signal strength and a distance prediction model. We collect 4500 signal strength measurements along nine walking paths toward ZigBee transmitters in three office buildings. We find that the log-distance path loss model used by Zbfind predicts transmitter distance with 92.5% mean absolute percentage error. We construct an alternative linear model that reduces error to 21%.
C1 [Ramsey, Benjamin W.; Mullins, Barry E.] USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[White, Edward D.] USAF, Dept Math & Stat, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Ramsey, BW (reprint author), USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM benjamin.ramsey@afit.edu; barry.mullins@afit.edu; edward.white@afit.edu
FU Center for Cyberspace Research
FX The authors acknowledge funding and support from the Center for
Cyberspace Research. The views expressed in this article are those of
the authors and do not reflect official policy of the United States Air
Force, Department of Defense or the U. S. Government.
NR 27
TC 2
Z9 2
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-2130-3; 978-1-4673-2128-0
PY 2012
BP 921
EP 924
PG 4
WC Computer Science, Hardware & Architecture
SC Computer Science
GA BEY20
UT WOS:000318619100037
ER
PT J
AU Heidenberg, DJ
Barton, JH
Young, D
Grinkemeyer, M
Sesterhenn, IA
AF Heidenberg, Daniel J.
Barton, Joel H.
Young, Denise
Grinkemeyer, Michael
Sesterhenn, Isabell A.
TI N-cadherin Expression in Testicular Germ Cell and Gonadal Stromal Tumors
SO JOURNAL OF CANCER
LA English
DT Article
DE N-cadherin; testis; germ cell tumors; gonadal stromal tumors
ID ONCOFETAL PROTEIN GLYPICAN-3; YOLK-SAC TUMOR; DIFFERENTIATION;
CARCINOMA; ADHESION; TESTIS; MARKER
AB Neural-cadherin is a member of the cadherin gene family encoding the N-cadherin protein that mediates cell adhesion. N-cadherin is a marker of Sertoli cells and is also expressed in germ cells of varying stages of maturation. The purpose of this study was to determine the presence and distribution of this protein by immunohistochemistry in 105 germ cell tumors of both single and mixed histological types and 12 gonadal stromal tumors. Twenty-four germ cell tumors consisted of one cell type and the remaining were mixed. Of the 23 seminomas in either pure or mixed tumors, 74% were positive. Two spermatocytic seminomas were positive. Of the 83 cases with yolk sac tumor, 99% were positive for N-cadherin. The teratomas were positive in 73% in neuroectodermal and / or glandular components. In contrast, 87% of embryonal carcinomas did not express N-cadherin. Only 17% of the syncytiotrophoblastic cells were positive for N-cadherin. In conclusion, N-cadherin expression is very helpful in the identification of yolk sac tumors. In addition to glypican-3 and Sal-like protein 4, N-cadherin can be beneficial for the diagnosis and classification of this subtype of testicular germ cell tumor. Nine of the 12 gonadal stromal tumors were positive to a variable extent.
C1 [Barton, Joel H.; Sesterhenn, Isabell A.] Joint Pathol Ctr, Dept Genitourinary Pathol, Silver Spring, MD 20910 USA.
[Heidenberg, Daniel J.] Tulane Univ, New Orleans, LA 70118 USA.
[Heidenberg, Daniel J.; Young, Denise] Uniformed Serv Univ Hlth Sci, Dept Surg, Ctr Prostate Dis Res, Bethesda, MD 20814 USA.
[Grinkemeyer, Michael] USAF, Sch Aerosp Med, Aeromed Res Dept, Wright Patterson AFB, OH 45433 USA.
RP Sesterhenn, IA (reprint author), Joint Pathol Ctr, Dept Genitourinary Pathol, Silver Spring, MD 20910 USA.
NR 17
TC 2
Z9 2
U1 1
U2 2
PU IVYSPRING INT PUBL
PI LAKE HAVEN
PA PO BOX 4546, LAKE HAVEN, NSW 2263, AUSTRALIA
SN 1837-9664
J9 J CANCER
JI J. Cancer
PY 2012
VL 3
BP 381
EP 389
DI 10.7150/jca.5017
PG 9
WC Oncology
SC Oncology
GA 135PD
UT WOS:000318299800048
PM 23074379
ER
PT J
AU Strack, G
Katz, E
AF Strack, Guinevere
Katz, Evgeny
TI Information Security Systems Based on Biomolecular Information
Processing
SO INTERNATIONAL JOURNAL OF UNCONVENTIONAL COMPUTING
LA English
DT Article
DE Keypad lock; Logic gate; Enzyme; Antibody; Molecular logic; Information
security; Biofuel cell; Barcode; Biocatalytic electrode
ID REGULATED BIOELECTRONIC DEVICES; LOGIC GATES; BIOFUEL CELLS; BOOLEAN
LOGIC; KEYPAD LOCK; BARCODES; SIGNALS; ENZYMES; RECOGNITION; INTERFACE
AB Digital information processing paradigms have inspired the design of chemical and biochemical systems operating with computational functionalities. Biomolecule-based unconventional computing has been applied to information security systems and demonstrated with DNA, but as emphasized herein, with biocatalysts and antibodies as well. Using conventional digital circuitry as inspiration, a keypad lock design was configured using biocatalytic cascades and antibody bio-recognition sequences. The biomolecular keypad locks were interfaced with switchable electrodes and incorporated into a model biofuel cell to demonstrate logically controlled power output. In addition, a robust bioelectronic interface served as a key that unlocks strings of digital code; the generated code-based on the control of the oxygen reduction reaction-produced a directly readable barcode.
C1 [Strack, Guinevere] USAF, Res Lab, Airbase Sci Div, Tyndall AFB, FL 32403 USA.
[Strack, Guinevere] Oak Ridge Inst Sci & Educ, Belcamp, MD 21017 USA.
[Katz, Evgeny] Clarkson Univ, Dept Chem & Biomol Sci, Potsdam, NY 13699 USA.
RP Strack, G (reprint author), USAF, Res Lab, Airbase Sci Div, Tyndall AFB, FL 32403 USA.
EM guinevere.strack.ctr@Tyndall.af.mil; ekatz@clarkson.edu
FU U.S. Air Force Research Laboratory
FX G. Strack was supported by an appointment to the Postgraduate Research
Participation Program at the U.S. Air Force Research Laboratory
administered by the Oak Ridge Institute for Science and Education
through an interagency agreement between the U.S. Department of Energy
and USAFRL.
NR 54
TC 0
Z9 0
U1 2
U2 16
PU OLD CITY PUBLISHING INC
PI PHILADELPHIA
PA 628 NORTH 2ND ST, PHILADELPHIA, PA 19123 USA
SN 1548-7199
J9 INT J UNCONV COMPUT
JI Int. J. Unconv. Comput.
PY 2012
VL 8
IS 5-6
SI SI
BP 419
EP 432
PG 14
WC Computer Science, Theory & Methods
SC Computer Science
GA 125LH
UT WOS:000317540800006
ER
PT S
AU Ray, I
Madria, SK
Linderman, M
AF Ray, Indrakshi
Madria, Sanjay K.
Linderman, Mark
GP IEEE
TI Query Plan Execution in a Heterogeneous Stream Management System for
Situational Awareness
SO 2012 31ST INTERNATIONAL SYMPOSIUM ON RELIABLE DISTRIBUTED SYSTEMS (SRDS
2012)
SE Symposium on Reliable Distributed Systems Proceedings
LA English
DT Proceedings Paper
CT 31st IEEE International Symposium on Reliable Distributed Systems (SRDS)
CY OCT 08-11, 2012
CL Univ Calif-Irvine (UCI), Irvine, CA
SP IEEE, IEEE Comp Soc, NSF
HO Univ Calif-Irvine (UCI)
DE Data stream management systems; situational awareness
AB Battlefield monitoring involves collecting streaming data from different sources, transmitting the data over a heterogeneous network, and processing queries in real-time in order to respond to events in a timely manner. Nodes in these networks differ with respect to their processing, storage and communication capabilities. Links in the network differ with respect to their communication bandwidth. The topology of the network itself is subject to change, as the nodes and links may become unavailable. Continuous queries executed in such environments must also meet some quality of service (QoS) requirements, such as, response time, throughput, and memory usage. We propose that the processing of the queries be shared to improve resource utilization, such as storage and bandwidth, which, in turn, will impact the QoS. We show how multiple queries can be represented in the form of an operator tree, such that their commonalities can be easily exploited for multi query plan generation. Query plans may have to be updated in this dynamic environment (network topology changes, arrival of new queries, arrival pattern of streams altered); this, in turn, necessitates migrating operators from one set of nodes to another. We sketch some ideas about how operator migration can be done efficiently in such environments.
C1 [Ray, Indrakshi] Colorado State Univ, Dept Comp Sci, Ft Collins, CO 80523 USA.
[Madria, Sanjay K.] Missouri Univ Sci & Technol, Dept Comp Sci, Rolla, MO 65409 USA.
[Linderman, Mark] Air Force Res Lab, Informat Directorate, Rome, NY 13308 USA.
RP Ray, I (reprint author), Colorado State Univ, Dept Comp Sci, Ft Collins, CO 80523 USA.
EM iray@cs.colostate.edu; madrias@mst.edu; mark.linderman@rl.af.mil
NR 15
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1060-9857
BN 978-0-7695-4784-8; 978-1-4673-2397-0
J9 SYM REL DIST SYST
PY 2012
BP 424
EP 429
DI 10.1109/SRDS.2012.54
PG 6
WC Computer Science, Hardware & Architecture; Computer Science, Information
Systems; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BEM72
UT WOS:000317389100056
ER
PT S
AU Fernando, R
Bhargava, B
Linderman, M
AF Fernando, Ruchith
Bhargava, Bharat
Linderman, Mark
GP IEEE
TI Private Anonymous Messaging
SO 2012 31ST INTERNATIONAL SYMPOSIUM ON RELIABLE DISTRIBUTED SYSTEMS (SRDS
2012)
SE Symposium on Reliable Distributed Systems Proceedings
LA English
DT Proceedings Paper
CT 31st IEEE International Symposium on Reliable Distributed Systems (SRDS)
CY OCT 08-11, 2012
CL Univ Calif-Irvine (UCI), Irvine, CA
SP IEEE, IEEE Comp Soc, NSF
HO Univ Calif-Irvine (UCI)
DE Anonymity; Privacy; Peer-to-peer messaging; hierarchical identity based
encryption
ID IDENTITY-BASED ENCRYPTION
AB Messaging systems where a user maintains a set of contacts and broadcasts messages to them is very common. We address the problem of a contact obtaining a message that it missed, from other contacts of the user while maintaining anonymity of all parties involved. We identify a set of requirements in addressing this problem and propose a modification to the hierarchical identity based encryption scheme proposed by Boneh et. al [2]. We briefly present an implementation of the proposed cryptographic primitives as a proof of concept.
C1 [Fernando, Ruchith; Bhargava, Bharat] Purdue Univ, Dept Comp Sci, W Lafayette, IN 47907 USA.
[Linderman, Mark] US Air Force, Res Lab, Rome, NY USA.
RP Fernando, R (reprint author), Purdue Univ, Dept Comp Sci, W Lafayette, IN 47907 USA.
EM rfernand@cs.purdue.edu; bb@cs.purdue.edu; mark.linderman@rl.af.mil
NR 5
TC 1
Z9 1
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1060-9857
BN 978-0-7695-4784-8; 978-1-4673-2397-0
J9 SYM REL DIST SYST
PY 2012
BP 430
EP 435
DI 10.1109/SRDS.2012.51
PG 6
WC Computer Science, Hardware & Architecture; Computer Science, Information
Systems; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BEM72
UT WOS:000317389100057
ER
PT S
AU Simpson, TB
Liu, JM
AlMulla, M
Usechak, N
Kovanis, V
AF Simpson, T. B.
Liu, Jia-Ming
AlMulla, Mohammad
Usechak, Nicholas
Kovanis, Vassilios
GP IEEE
TI Tunable Photonic Microwave Oscillator Self-Locked by
Polarization-Rotated Optical Feedback
SO 2012 IEEE INTERNATIONAL FREQUENCY CONTROL SYMPOSIUM (FCS)
SE IEEE International Frequency Control Symposium
LA English
DT Proceedings Paper
CT IEEE International Frequency Control Symposium (IFCS)
CY MAY 21-24, 2012
CL Baltimore, MD
SP IEEE, UFFC
ID SEMICONDUCTOR-LASER; INJECTION; DYNAMICS
AB Combining optical injection and polarization-rotated optical feedback in a semiconductor laser can induce self-referenced periodic output that is widely tunable by simply varying the dc-bias points of the master and slave lasers. We observed feedback-induced reduction of the pulsation peak linewidth by more than two orders of magnitude relative to the injection-only case. The nonlinear dynamics of the optically injected semiconductor laser can be used to minimize sensitivity to fluctuations in the operating points. Performance is negatively affected by interference between the external injection signal and residual feedback in the same polarization.
C1 [Simpson, T. B.] L3 Appl Technol Inc, Pulse Sci Div, San Diego, CA 92121 USA.
[Liu, Jia-Ming; AlMulla, Mohammad] Univ Calif Angeles, Dept Elect Engn, Los Angeles, CA USA.
[Usechak, Nicholas; Kovanis, Vassilios] US Air Force, Res Labs, Wright Patterson AFB, OH USA.
RP Simpson, TB (reprint author), L3 Appl Technol Inc, Pulse Sci Div, San Diego, CA 92121 USA.
EM Vassilios.kovanis@wpafb.af.mil
FU AFRL under a contract with Optimetrics, Inc; Air Force Office of
Scientific Research
FX T. B. Simpson and J. M. Liu were supported by AFRL under a contract with
Optimetrics, Inc. Nicholas Usechak and Vassilios Kovanis were supported
by the Air Force Office of Scientific Research.
NR 5
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1075-6787
BN 978-1-4577-1819-9
J9 P IEEE INT FREQ CONT
PY 2012
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied;
Telecommunications
SC Engineering; Physics; Telecommunications
GA BEJ76
UT WOS:000316994400153
ER
PT S
AU Krause, A
Nguyen, L
Tuan, C
Bonsell, J
Chen, B
Blasey, JD
Zemotel, JP
McNerney, H
Metzger, FJ
AF Krause, Aaron
Lim Nguyen
Christopher Tuan
Bonsell, John
Chen, Bing
Blasey, Joel D.
Zemotel, James P.
McNerney, Holly
Metzger, Ferdinand J.
GP IEEE
TI Conductive Concrete as an Electromagnetic Shield
SO 2012 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)
SE IEEE International Symposium on Electromagnetic Compatibility
LA English
DT Proceedings Paper
CT IEEE International Symposium on Electromagnetic Compatibility (EMC)
CY AUG 05-10, 2012
CL Pittsburgh, PA
SP IEEE, Electromagnet Compatibil Soc, China Electrotechn Soc, Evaluat Engn (EE), ENR, Microwave Digest, Microwave Journal, RF Globalnet, SAFETY & EMC Magazine, In Compliance Magazine, ITEM Media, ETS LINDGREN, Keystone Compliance, Retlif Testing Labs, Andro Computat Solutions, LLC, MIDCOM, Wurth Elekt, Gauss Instruments GmbH
DE Conductive concrete; electromagnetic; shielding
AB Conductive concrete mixture was originally developed for surface de-icing purposes but can be designed to perform as an electromagnetic shield. Testing procedures have been developed to measure the attenuation provided by conductive concrete without the cost and labor of building a large structure. This paper provides a description of the design, testing methods, and results obtained from the development of conductive concrete as an electromagnetic shielding material.
C1 [Krause, Aaron; Lim Nguyen; Chen, Bing] Univ Nebraska Lincoln, Comp & Elect Engn, Lincoln, NE 68588 USA.
[Christopher Tuan] Univ Nebraska Lincoln, Dept Civil Engn, Lincoln, NE USA.
[Bonsell, John] Univ Nebraska Lincoln, Durham Sch Architectural Engn & Construct, Lincoln, NE USA.
[Blasey, Joel D.; Zemotel, James P.; McNerney, Holly; Metzger, Ferdinand J.] US Air Force, Offutt Base, Dept Air Force, Omaha, NE USA.
RP Krause, A (reprint author), Univ Nebraska Lincoln, Comp & Elect Engn, Lincoln, NE 68588 USA.
FU US Defense Threat Reduction Agency
FX The authors would like to thank Dr. William Linzey of the US Defense
Threat Reduction Agency for his support of this study. Thanks are also
extended to Kelvin Lein and Jeffrey Svatora of the Civil Engineering
Department at the University of Nebraska- Lincoln for their work
producing the conductive concrete samples used in the testing.
NR 5
TC 1
Z9 1
U1 1
U2 5
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2158-110X
BN 978-1-4673-2060-3
J9 IEEE INT SYMP ELEC
PY 2012
BP 85
EP 87
PG 3
WC Engineering, Electrical & Electronic
SC Engineering
GA BEJ75
UT WOS:000316991700016
ER
PT S
AU Prather, WD
Rooney, MR
Cafferky, J
Rynne, TM
AF Prather, William D.
Rooney, Michael R.
Cafferky, Jory
Rynne, Timothy M.
GP IEEE
TI Swept CW Testing of Shielded Systems
SO 2012 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)
SE IEEE International Symposium on Electromagnetic Compatibility
LA English
DT Proceedings Paper
CT IEEE International Symposium on Electromagnetic Compatibility (EMC)
CY AUG 05-10, 2012
CL Pittsburgh, PA
SP IEEE, Electromagnet Compatibil Soc, China Electrotechn Soc, Evaluat Engn (EE), ENR, Microwave Digest, Microwave Journal, RF Globalnet, SAFETY & EMC Magazine, In Compliance Magazine, ITEM Media, ETS LINDGREN, Keystone Compliance, Retlif Testing Labs, Andro Computat Solutions, LLC, MIDCOM, Wurth Elekt, Gauss Instruments GmbH
DE continuous wave; CW measurements; hardness surveillance; HM/HS; HEMP;
verification
AB After the incorporation of several design improvements, the Ellipticus CW Illuminator has been demonstrated in both horizontal and vertical polarizations to produce a continuous, flat spectrum from 100 kHz to 1 GHz. This paper describes the updated CW illuminator system, examines some example field data, and discusses some of the antenna and instrumentation issues encountered above 100MHz that had not been clearly seen before. Methods of measuring and evaluating the system are presented and some methods of troubleshooting and resolving problems are discussed.
C1 [Prather, William D.] USAF, Res Lab, Kirtland AFB, NM 78150 USA.
[Rooney, Michael R.] Def Threat Reduct Agcy, Ft Belvoir, VA USA.
Oklahoma City Air Logist Ctr, Oklahoma City, OK USA.
[Cafferky, Jory] EG G URS, Albuquerque, NM USA.
[Rynne, Timothy M.] Northrop Grumman, Palmdale, CA USA.
RP Prather, WD (reprint author), USAF, Res Lab, Kirtland AFB, NM 78150 USA.
EM william.prather@ieee.org
NR 10
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2158-110X
BN 978-1-4673-2060-3
J9 IEEE INT SYMP ELEC
PY 2012
BP 647
EP 652
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BEJ75
UT WOS:000316991700118
ER
PT S
AU Johnson, MR
AF Johnson, Michael R.
GP IEEE
TI FSV versus Human Subjective Data Evaluation; an Informal Survey
SO 2012 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)
SE IEEE International Symposium on Electromagnetic Compatibility
LA English
DT Proceedings Paper
CT IEEE International Symposium on Electromagnetic Compatibility (EMC)
CY AUG 05-10, 2012
CL Pittsburgh, PA
SP IEEE, Electromagnet Compatibil Soc, China Electrotechn Soc, Evaluat Engn (EE), ENR, Microwave Digest, Microwave Journal, RF Globalnet, SAFETY & EMC Magazine, In Compliance Magazine, ITEM Media, ETS LINDGREN, Keystone Compliance, Retlif Testing Labs, Andro Computat Solutions, LLC, MIDCOM, Wurth Elekt, Gauss Instruments GmbH
AB Feature Selection Validation has now become an IEEE Standard, and is gaining popularity in the Computational Electromagnetic Community. This paper presents an informal and admittedly unscientific survey of various professionals' opinion of the match of models and measurements. Four data sets were presented to individuals who were asked to give a global value, using the FSV Validation Rating Scale. This was compared to the average Global Data Measure for each data set. It is shown that over a sample of 28 people the average Global Data Measure did indeed agree with that calculated by FSV for two of our sample sets, and may have agreed with the other two under more rigid circumstances. Data was taken as functions of engineering background and levels of experience in the field of engineering in general, and electrical engineering specifically. This admittedly anecdotal data demonstrates that FSV can be a valuable tool, but human experience is key to understanding the use of any data set, and context of its use, as always, remains the most important aspect of evaluating results of the process.
C1 USAF, SEEK EAGLE Off, Eglin AFB, FL 32542 USA.
RP Johnson, MR (reprint author), USAF, SEEK EAGLE Off, Eglin AFB, FL 32542 USA.
EM michael.johnson.10@us.af.mil
NR 6
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2158-110X
BN 978-1-4673-2060-3
J9 IEEE INT SYMP ELEC
PY 2012
BP 669
EP 674
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BEJ75
UT WOS:000316991700122
ER
PT S
AU Johnson, MR
Coffey, EL
AF Johnson, Michael R.
Coffey, Edgar L., III
GP IEEE
TI Using FSV with Far-Field Patterns
SO 2012 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY (EMC)
SE IEEE International Symposium on Electromagnetic Compatibility
LA English
DT Proceedings Paper
CT IEEE International Symposium on Electromagnetic Compatibility (EMC)
CY AUG 05-10, 2012
CL Pittsburgh, PA
SP IEEE, Electromagnet Compatibil Soc, China Electrotechn Soc, Evaluat Engn (EE), ENR, Microwave Digest, Microwave Journal, RF Globalnet, SAFETY & EMC Magazine, In Compliance Magazine, ITEM Media, ETS LINDGREN, Keystone Compliance, Retlif Testing Labs, Andro Computat Solutions, LLC, MIDCOM, Wurth Elekt, Gauss Instruments GmbH
AB Feature Selection Validation has now become an IEEE Standard, and is gaining popularity in the Computational Electromagnetic Community. As with any new approach it presents new and unique challenges to the user. This paper explores the use of Feature Selection Validation for evaluating far-field patterns in several examples and discusses some practical limitation discovered. One important conclusion that must be drawn is that context remains the most important aspect of evaluating results with the Feature Selection Validation process.
C1 [Johnson, Michael R.] USAF, SEEK EAGLE Off, Eglin AFB, FL 32542 USA.
[Coffey, Edgar L., III] Appl Res Assoc Inc, Belcamp, MD 21017 USA.
RP Johnson, MR (reprint author), USAF, SEEK EAGLE Off, Eglin AFB, FL 32542 USA.
EM michael.johnson.10@us.af.mil; bcoffey@ara.com
FU Applied Research Associates under U. S. Air Force [FA9201-09-D-0066]
FX The authors wish to acknowledge the work done by Applied Research
Associates under U. S. Air Force contract FA9201-09-D-0066.
NR 6
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2158-110X
BN 978-1-4673-2060-3
J9 IEEE INT SYMP ELEC
PY 2012
BP 686
EP 691
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BEJ75
UT WOS:000316991700125
ER
PT J
AU Rosa, W
AF Rosa, Wilson
GP IEEE Computer Society
TI Empirical Effort and Schedule Estimation for Enterprise Resource
Planning Projects
SO PROCEEDINGS OF THE 2012 JOINT CONFERENCE OF THE 22ND INTERNATIONAL
WORKSHOP ON SOFTWARE MEASUREMENT AND THE 2012 SEVENTH INTERNATIONAL
CONFERENCE ON SOFTWARE PROCESS AND PRODUCT MEASUREMENT (IWSM-MENSURA
2012)
LA English
DT Proceedings Paper
CT Joint Conference of the 22nd International Workshop on Software
Measurement / 7th International Conference on Software Process and
Product Measurement (IWSM-MENSURA)
CY OCT 17-19, 2012
CL Gruppo Utenti Funct Point Italia - Italian Software Metr Assoc
(GUFPI-ISMA, Assisi, ITALY
SP Ecole Technologie Superieure (ETS), Otto Guericke Univ Magdeburg, CuBIT, Univ Alcala, Univ Studiorum Insubriae
HO Gruppo Utenti Funct Point Italia - Italian Software Metr Assoc (GUFPI-ISMA
DE ERP; software development; effort estimation; schedule estimation; RICE
objects; software estimation
ID ERP PROJECTS
AB Enterprise Resource Planning (ERP) projects are considered commercial-off-the-shelf (COTS) solutions where one substantial COTS product (e. g. Oracle, SAP) is tailored to provide automated business functions. This paper presents effort and schedule estimating models for predicting ERP implementation. The first two models use product size to predict software development effort. Product size is measured in terms of the number of report, interface, conversion, and extension (RICE) objects that are tailored or modified in the COTS product suite. The third model predicts the duration of software development phase as a function of RICE objects and full time equivalent staff. These statistical models are based on empirical data collected from 22 programs implemented within the federal government over the course of ten years beginning in 2001. Result shows that number of RICE objects is a good predictor of ERP software development effort and duration.
C1 USAF, Cost Anal Agcy, Joint Base Andrews NAF, Washington, MD 20762 USA.
RP Rosa, W (reprint author), USAF, Cost Anal Agcy, Joint Base Andrews NAF, 1500 West Perimeter Rd,Suite 3500, Washington, MD 20762 USA.
EM Wilson.rosa@pentagon.af.mil
NR 28
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-0-7695-4840-1
PY 2012
BP 190
EP 197
DI 10.1109/IWSM-MENSURA.2012.35
PG 8
WC Computer Science, Software Engineering
SC Computer Science
GA BEK57
UT WOS:000317102600028
ER
PT B
AU Linderman, MH
Chase, G
Boury-Brisset, AC
Nevitt, J
Henley, J
Read, R
Russell, S
Hyden, P
AF Linderman, Mark H.
Chase, Greg
Boury-Brisset, Anne-Claire
Nevitt, Justin
Henley, Justin
Read, Robert
Russell, Stephen
Hyden, Paul
BE Blasch, E
Bosse, E
Lambert, DA
TI The Role of Information Management to Support High-Level Fusion
SO HIGH-LEVEL INFORMATION FUSION MANAGEMENT AND SYSTEMS DESIGN
SE Artech House Intelligence and Information Operations Series
LA English
DT Article; Book Chapter
AB High-level information fusion (HLIF) processes are critically dependent on quality information sources in order to generate meaningful outcomes. Quality information necessitates the right combination of people, processes, and tools to form an effective information space. This critical task is generally known as Information Management (IM). This chapter overviews IM, discusses IM goals and challenges in a coalition environment, and presents an IM model. The model provides an abstract representation of the important artifacts, actors and services that are required to form an effective IM capability. After a brief exposition of the model, IM best practices are considered. IM issues of particular interest to fusion scenarios are identified, including the information lifecycle that exists between the sensors and information exploitation (IX) systems, interoperability issues, information context, partially structured information, IM as a service, IM workflows, and IM from an agent perspective.
C1 [Linderman, Mark H.] USAF, Res Lab, Informat Directorate, Rome, NY 13441 USA.
[Chase, Greg] DSTO, Edinburgh, SA 5111, Australia.
[Boury-Brisset, Anne-Claire] Def Resarch & Dev Canada Valcartier, Quebec City, PQ G3J 1X5, Canada.
[Nevitt, Justin; Russell, Stephen; Hyden, Paul] USN, Res Lab, Washington, DC 20375 USA.
[Henley, Justin] DSTL, Portsdown West PO17 6AD, Fareham, England.
[Read, Robert] DTA, Auckland 0744, New Zealand.
RP Linderman, MH (reprint author), USAF, Res Lab, Informat Directorate, 525Brooks Rd, Rome, NY 13441 USA.
EM mark.linderman@rl.af.mil; gregchase@adam.com.au;
Anne-Claire.Boury-Brisset@drdc-rddc.gc.ca; justin.nevitt@nrl.navy.mil;
JTHENLEY@mail.dstl.gov.uk; r.read@dta.mil.nz;
stephen.russell@nrl.navy.mil; paul.hyden@nrl.navy.mil
NR 17
TC 0
Z9 0
U1 0
U2 0
PU ARTECH HOUSE
PI NORWOOD
PA 685 CANTON ST, NORWOOD, MA 02062 USA
BN 978-1-60807-151-7
J9 ARTECH HSE INTEL INF
PY 2012
BP 105
EP 135
PG 31
WC Computer Science, Information Systems
SC Computer Science
GA BEL07
UT WOS:000317148000005
ER
PT B
AU Lambert, DA
Wark, S
Bosse, E
Pigeon, L
Blackman, C
Hinman, M
AF Lambert, Dale A.
Wark, Steven
Bosse, Eloi
Pigeon, Luc
Blackman, Clinton
Hinman, Michael
BE Blasch, E
Bosse, E
Lambert, DA
TI A Coalition Approach to High-Level Information Fusion
SO HIGH-LEVEL INFORMATION FUSION MANAGEMENT AND SYSTEMS DESIGN
SE Artech House Intelligence and Information Operations Series
LA English
DT Article; Book Chapter
AB This chapter is concerned with the theory and practical implementation of high-level information fusion (HLIF). It relates to a collaborative program of work in HLIF that has been conducted between Australia, Canada, the United States, and the United Kingdom through The Technical Cooperation Program (TTCP) panel on information fusion. In this chapter, we bring together ideas presented in previous chapters, overview the Coalition Distributed Information Fusion Testbed (CDIFT), describe three vignettes, and explain methods for combining low-level information fusion (LLIF) object assessment with HLIF situation and threat assessment, user refinement, and sensor management.
C1 [Lambert, Dale A.; Wark, Steven] Def Sci & Technol Org, Edinburgh, SA 5111, Australia.
[Bosse, Eloi] Univ Laval, Dept Elect & Comp Engn, Quebec City, PQ G1V 0A6, Canada.
[Pigeon, Luc] Def Resarch & Dev Canada Valcartier, Quebec City, PQ G3J 1X5, Canada.
[Hinman, Michael] USAF, Res Lab, Informat Directorate, Rome, NY 13441 USA.
RP Lambert, DA (reprint author), Def Sci & Technol Org, Room L205-2-H-25,POB 1500, Edinburgh, SA 5111, Australia.
EM dale.lambert@dsto.defence.gov.au; Steven.Wark@dsto.defence.gov.au;
Luc.Pigeon@drdc-rddc.gc.ca; michael.hinman@rl.af.mil
NR 24
TC 0
Z9 0
U1 0
U2 0
PU ARTECH HOUSE
PI NORWOOD
PA 685 CANTON ST, NORWOOD, MA 02062 USA
BN 978-1-60807-151-7
J9 ARTECH HSE INTEL INF
PY 2012
BP 251
EP 277
PG 27
WC Computer Science, Information Systems
SC Computer Science
GA BEL07
UT WOS:000317148000012
ER
PT B
AU Blasch, EP
Salerno, JJ
Tadda, GP
AF Blasch, Erik P.
Salerno, John J.
Tadda, George P.
BE Blasch, E
Bosse, E
Lambert, DA
TI Measuring the Worthiness of Situation Assessment
SO HIGH-LEVEL INFORMATION FUSION MANAGEMENT AND SYSTEMS DESIGN
SE Artech House Intelligence and Information Operations Series
LA English
DT Article; Book Chapter
AB Situation assessment (SA) modeling has many instances of development, but there has yet to be a comprehensive set of metrics used for performance evaluation. The amount of data being presented and displayed to the analyst is overwhelming to a point where, in many cases, they are missing the salient or key activities of interest (AOI). Analysts are spending the majority of their time filtering through the data rather than performing analysis. To aid the user's situation awareness (SAW), we explore the nature of how we can rank various activities based on their impact and threat. We develop an information fusion SA reference model over SA metrics of confidence (precision, recall), accuracy, activities of interest, timeliness, and throughput to determine the intent and assessment of situation activities.
C1 [Blasch, Erik P.] Def Resarch & Dev Canada Valcartier, Decis Support Syst Sect, Def Res & Dev Canada Valcartier, Quebec City, PQ G3J 1X5, Canada.
[Salerno, John J.; Tadda, George P.] USAF, Res Lab, Informat Directorate, Rome, NY 13441 USA.
RP Blasch, EP (reprint author), Def Resarch & Dev Canada Valcartier, Decis Support Syst Sect, Def Res & Dev Canada Valcartier, 2459 Pie 11 Blvd North, Quebec City, PQ G3J 1X5, Canada.
EM erik.blasch@gmail.com; john.salerno@rl.af.mil; george.tadda@rl.af.mil
NR 30
TC 0
Z9 0
U1 0
U2 0
PU ARTECH HOUSE
PI NORWOOD
PA 685 CANTON ST, NORWOOD, MA 02062 USA
BN 978-1-60807-151-7
J9 ARTECH HSE INTEL INF
PY 2012
BP 315
EP 329
PG 15
WC Computer Science, Information Systems
SC Computer Science
GA BEL07
UT WOS:000317148000015
ER
PT B
AU Chambers, WA
AF Chambers, William A.
BE Lowther, AB
TI DETERRENCE: RISING POWERS, ROGUE REGIMES, AND TERRORISM IN THE
TWENTY-FIRST CENTURY FOREWORD
SO DETERRENCE: RISING POWERS, ROGUE REGIMES, AND TERRORISM IN THE
TWENTY-FIRST CENTURY
LA English
DT Editorial Material; Book Chapter
C1 USAF, Washington, DC 20330 USA.
RP Chambers, WA (reprint author), USAF, Washington, DC 20330 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU PALGRAVE
PI BASINGSTOKE
PA HOUNDMILLS, BASINGSTOKE RG21 6XS, ENGLAND
BN 978-1-137-28981-0
PY 2012
BP XI
EP XIII
D2 10.1057/9781137289810
PG 3
WC International Relations; Political Science
SC International Relations; Government & Law
GA BED77
UT WOS:000316227200001
ER
PT B
AU Beeker, KR
Mills, RF
Grimaila, MR
Haas, MW
AF Beeker, Kevin R.
Mills, Robert F.
Grimaila, Michael R.
Haas, Michael W.
BE Lowther, AB
TI CAN AN OPERATIONALLY RESPONSIVE CYBERSPACE PLAY A CRITICAL ROLE IN THE
STRATEGIC DETERRENCE EQUATION?
SO DETERRENCE: RISING POWERS, ROGUE REGIMES, AND TERRORISM IN THE
TWENTY-FIRST CENTURY
LA English
DT Article; Book Chapter
C1 [Beeker, Kevin R.] USAF, Washington, DC USA.
[Mills, Robert F.; Grimaila, Michael R.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Haas, Michael W.] USAF, Human Performance Wing 711, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Beeker, KR (reprint author), US Cyber Command, Combat Targeting Div, Ft George G Meade, MD USA.
NR 19
TC 0
Z9 0
U1 0
U2 0
PU PALGRAVE
PI BASINGSTOKE
PA HOUNDMILLS, BASINGSTOKE RG21 6XS, ENGLAND
BN 978-1-137-28981-0
PY 2012
BP 17
EP 32
D2 10.1057/9781137289810
PG 16
WC International Relations; Political Science
SC International Relations; Government & Law
GA BED77
UT WOS:000316227200003
ER
PT J
AU Jabbour, KT
Ratazzi, EP
AF Jabbour, Kamaal T.
Ratazzi, E. Paul
BE Lowther, AB
TI DOES THE UNITED STATES NEED A NEW MODEL FOR CYBER DETERRENCE?
SO DETERRENCE: RISING POWERS, ROGUE REGIMES, AND TERRORISM IN THE
TWENTY-FIRST CENTURY
LA English
DT Article; Book Chapter
C1 [Jabbour, Kamaal T.] USAF, Res Lab, Informat Directorate, Rome, NY USA.
[Jabbour, Kamaal T.] Syracuse Univ, Comp Engn Fac, Syracuse, NY 13244 USA.
[Ratazzi, E. Paul] USAF, Res Lab, Cyber Assurance Branch, Rome, NY USA.
RP Jabbour, KT (reprint author), USAF, Res Lab, Informat Directorate, Rome, NY USA.
NR 22
TC 0
Z9 0
U1 0
U2 0
PU PALGRAVE
PI BASINGSTOKE
PA HOUNDMILLS, BASINGSTOKE RG21 6XS, ENGLAND
BN 978-1-137-28981-0
PY 2012
BP 33
EP 45
D2 10.1057/9781137289810
PG 13
WC International Relations; Political Science
SC International Relations; Government & Law
GA BED77
UT WOS:000316227200004
ER
PT S
AU Esfahani, NN
Peale, RE
Buchwald, WR
Hendrickson, JR
Cleary, JW
AF Esfahani, Nima Nader
Peale, Robert. E.
Buchwald, Walter R.
Hendrickson, Joshua R.
Cleary, Justin W.
BE LeVan, PD
Sood, AK
Wijewarnasuriya, PS
DSouza, AI
TI First observation of a plasmon-mediated tunable photoresponse in a
grating-gated InGaAs/InP HEMT for millimeter-wave detection
SO INFRARED SENSORS, DEVICES, AND APPLICATIONS II
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Infrared Sensors, Devices, and Applications II
CY AUG 14-15, 2012
CL San Diego, CA
SP SPIE
DE HEMT; Plasmon; terahertz; 2DEG
ID FIELD-EFFECT TRANSISTORS
AB A tunable resonant photoresponse to millimeter-waves is demonstrated in a grating-gated high electron mobility transistor (HEMT) formed by an InGaAs/InP heterostructure. The gate consists of a metal grating with 9 mu m period, which was designed to couple mm-radiation to plasmons in the two-dimensional electron gas (2DEG) of the HEMT. The resonant excitation of plasmons, which shifts with gate-bias, changes the channel conductance. These devices have potential as chip-scale frequency-agile mm-wave detectors, which may be scaled to THz frequencies.
C1 [Esfahani, Nima Nader; Peale, Robert. E.] Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA.
[Esfahani, Nima Nader; Buchwald, Walter R.] Solid State Sci Corp, Nashua, NH USA.
[Esfahani, Nima Nader; Hendrickson, Joshua R.; Cleary, Justin W.] US Air Force, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Esfahani, NN (reprint author), Univ Cent Florida, Dept Phys, Orlando, FL 32816 USA.
FU Air Force Office [10RY04COR]; LRIR [12RY10COR]; Air Force office of
Scientific Research ( Program Manager Dr. Gernot Pomrenke)
[FA95501010030]
FX NNE and JWC would like to acknowledge support from the Air Force Office
of Scientific Research ( Program Manager Dr. Gernot Pomrenke) under LRIR
number 12RY10COR. REP acknowledges support by the Air Force office of
Scientific Research ( Program Manager Dr. Gernot Pomrenke) under grant
number FA95501010030. JRH would also like to acknowledge support from
the Air Force Office of Scientific Research ( Program Manager Dr. Gernot
Pomrenke) under LRIR number 10RY04COR.
NR 13
TC 2
Z9 2
U1 1
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9229-6
J9 PROC SPIE
PY 2012
VL 8512
AR 85120Y
DI 10.1117/12.930359
PG 7
WC Remote Sensing; Optics
SC Remote Sensing; Optics
GA BEH87
UT WOS:000316636700025
ER
PT S
AU Haugan, HJ
Brown, GJ
Elhamri, S
Olson, BV
Boggess, TF
Grazulis, L
Pacley, S
AF Haugan, H. J.
Brown, G. J.
Elhamri, S.
Olson, B. V.
Boggess, T. F.
Grazulis, L.
Pacley, S.
BE LeVan, PD
Sood, AK
Wijewarnasuriya, PS
DSouza, AI
TI Annealing effect on the long wavelength infrared InAs/GaSb superlattice
materials
SO INFRARED SENSORS, DEVICES, AND APPLICATIONS II
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Infrared Sensors, Devices, and Applications II
CY AUG 14-15, 2012
CL San Diego, CA
SP SPIE
AB Annealing effect on the quality of long wavelength infrared (LWIR) InAs/GaSb superlattices (SLs) has been investigated using atomic force microscopy (AFM), photoconductivity, temperature dependent Hall, and time-resolved differential transmission measurements using an electronically delayed pump-probe technique. Quarters of a single SL wafer were annealed at 440, 480, and 515 degrees C, respectively for 30 minutes under a Sb-over pressure. Morphological qualities of the SL surface observed by AFM did not show any indication of improvement with annealing. However, the spectral intensity measured by photoconductivity showed an approximately 25 % improvement, while the band gap energy remained at similar to 107 meV for each anneal, The electron mobility was nearly unaffected by the 440 and 480 degrees C anneals, however showed the improvement with the 515 degrees C anneal, where the mobility increased from similar to 4500 to 6300 cm(2)/Vs. The minority carrier lifetime measured at 77 K also showed the improvement with annealing, increasing from 12.0 to 15.4 nanoseconds. In addition to the longer lifetimes, the annealed samples had a larger radiative decay component than that of unannealed sample. Both the longer measured lifetime and the larger radiative decay component are consistent with the modest improvement in the quality of the annealed SL sample. Overall the qualities of LWIR SL materials can be benefit from a post growth annealing technique we applied.
C1 [Haugan, H. J.; Brown, G. J.; Grazulis, L.; Pacley, S.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Elhamri, S.] Univ Dayton, Dept Phys, Dayton, OH 45469 USA.
[Olson, B. V.; Boggess, T. F.] Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA.
RP Haugan, HJ (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
FU Air Force [FA8650-11-D-5801]
FX The work of H. J. Haugan was performed under Air Force contract number
FA8650-11-D-5801.
NR 15
TC 0
Z9 0
U1 2
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9229-6
J9 PROC SPIE
PY 2012
VL 8512
AR 85120K
DI 10.1117/12.928713
PG 8
WC Remote Sensing; Optics
SC Remote Sensing; Optics
GA BEH87
UT WOS:000316636700013
ER
PT S
AU Steenbergen, EH
Connelly, BC
Metcalfe, GD
Shen, H
Wraback, M
Lubyshev, D
Qiu, Y
Fastenau, JM
Liu, AWK
Elhamri, S
Cellek, OO
Zhang, YH
AF Steenbergen, E. H.
Connelly, B. C.
Metcalfe, G. D.
Shen, H.
Wraback, M.
Lubyshev, D.
Qiu, Y.
Fastenau, J. M.
Liu, A. W. K.
Elhamri, S.
Cellek, O. O.
Zhang, Y. -H.
BE LeVan, PD
Sood, AK
Wijewarnasuriya, PS
DSouza, AI
TI Temperature-dependent minority carrier lifetimes of InAs/InAs1-xSbx
type-II superlattices
SO INFRARED SENSORS, DEVICES, AND APPLICATIONS II
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Infrared Sensors, Devices, and Applications II
CY AUG 14-15, 2012
CL San Diego, CA
SP SPIE
DE temperature-dependent; lifetime; photoluminescence; infrared;
superlattice
AB Temperature-dependent minority carrier lifetimes of InAs/InAs1-xSbx type-II superlattices are presented. The longest lifetime at 11 K is 504 +/- 40 ns and at 77 K is 412 +/- 25 ns. Samples with long periods and small wave function overlaps have both non-radiative and radiative recombination mechanisms apparent, with comparable contributions from both near 77 K, and radiative recombination dominating at low temperatures. Samples with short periods and large wave function overlaps have radiative recombination dominating from 10 K until similar to 200 K. The improved lifetimes observed will enable long minority carrier lifetime superlattices to be designed for high quantum efficiency, low dark current infrared detectors.
C1 [Steenbergen, E. H.] USAF, Res Lab, AFRL RXAN, Wright Patterson AFB, OH 45433 USA.
[Steenbergen, E. H.; Cellek, O. O.; Zhang, Y. -H.] Arizona State Univ, Sch Elect, Center Photon Innovat, Comp & Energy Engn, Tempe, AZ 85287 USA.
[Connelly, B. C.; Metcalfe, G. D.; Shen, H.; Wraback, M.] U S Army Res Lab, RDRL SEE M, Adelphi, MD 20783 USA.
[Lubyshev, D.; Qiu, Y.; Fastenau, J. M.; Liu, A. W. K.] IQE Inc, Bethlehem, PA 18015 USA.
[Elhamri, S.] Univ Dayton, Department Phys, Dayton, OH 45469 USA.
RP Steenbergen, EH (reprint author), USAF, Res Lab, AFRL RXAN, Wright Patterson AFB, OH 45433 USA.
EM Elizabeth.Steenbergen@wpafb.af.mil
FU DOD Science Math And Research for Transformation; Science Foundation
Arizon; ASU Graduate and Professional Student Association; MURI program;
U. S. Army Research Office [W911NF-10-1-0524]; Air Force Office for
Scientific Research [FA9550-10-1-0129]; Army Research Laboratory
[W911NF-12-2-0019]
FX EHS acknowledges graduate fellowships from the DOD Science Math And
Research for Transformation, Science Foundation Arizona, Achievement
Rewards for College Scientists, and the ASU Graduate and Professional
Student Association. This work was also partially supported by a MURI
program from the U. S. Army Research Office with the grant number
W911NF-10-1-0524, and a program from the Air Force Office for Scientific
Research with the grant number FA9550-10-1-0129. BCC acknowledges
support by the Army Research Laboratory, accomplished under Cooperative
Agreement Number W911NF-12-2-0019.
NR 17
TC 5
Z9 5
U1 0
U2 11
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9229-6
J9 PROC SPIE
PY 2012
VL 8512
AR 85120L
DI 10.1117/12.930949
PG 8
WC Remote Sensing; Optics
SC Remote Sensing; Optics
GA BEH87
UT WOS:000316636700014
ER
PT S
AU Dalton, MJ
Stewart, DJ
Kannan, R
Swiger, RN
Orseno, DL
Haley, JE
Cooper, TM
Tan, LS
AF Dalton, Matthew J.
Stewart, David J.
Kannan, Ramamurthi
Swiger, Rachel N.
Orseno, Dominic L.
Haley, Joy E.
Cooper, Thomas M.
Tan, Loon-Seng
BE Jakubiak, R
Eich, M
Nunzi, JM
TI Exciplex formation in solid state blends of charge-transfer-type AFX
dyes and bisimide compounds
SO OPTICAL PROCESSES IN ORGANIC MATERIALS AND NANOSTRUCTURES
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Optical Processes in Organic Materials and Nanostructures
CY AUG 12-15, 2012
CL San Diego, CA
SP SPIE
DE Two photon dyes; exciplex; fluorescence quenching; phthalimide
ID STATIONARY ELECTRODE POLAROGRAPHY; CONJUGATED POLYMERS
AB We have been studying exciplex formation in nonlinear optical materials containing a high concentration of 2PA chromophores (AFX dyes) as a means to enhance the nonlinear optical properties. A number of dipolar AFX dyes having various electron-accepting moieties (pi-excess and pi-deficient examples) and three bisimide compounds having substituents with varying electron-withdrawing power were synthesized to study exciplex formation in their solid state blends. In substrate supported thin films of various equimolar blends containing an AFX dye and bisimide, the dye monomer emission was severely quenched, and a new emission, red-shifted by up to 110 nm, appeared. The emission energies were consistent with the charge recombination energy calculated from the energy levels of the donor and acceptor present in the blend, which confirmed the emission was from an exciplex. Time resolved emission measurements also indicated the presence of much longer lived transients in the blends, consistent with exciplex formation. Spectroelectrochemistry confirmed that the radical cations of these dyes had strong absorption in the NIR region, so exciplex formation is a means to enhance nonlinear optical absorption of the dyes in this spectral region.
C1 [Dalton, Matthew J.; Stewart, David J.; Kannan, Ramamurthi; Swiger, Rachel N.; Orseno, Dominic L.; Haley, Joy E.; Cooper, Thomas M.; Tan, Loon-Seng] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Dalton, MJ (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RI Tan, Loon-Seng/F-6985-2012
OI Tan, Loon-Seng/0000-0002-2134-9290
NR 19
TC 0
Z9 0
U1 0
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9191-6
J9 PROC SPIE
PY 2012
VL 8474
AR 847407
DI 10.1117/12.931674
PG 10
WC Nanoscience & Nanotechnology; Optics
SC Science & Technology - Other Topics; Optics
GA BEE08
UT WOS:000316252100004
ER
PT S
AU Hendrickson, J
Homyk, A
Scherer, A
Alasaarela, T
Saynatjoki, A
Honkanen, S
Richards, BC
Kim, JY
Lee, YH
Gibson, R
Gehl, M
Olitzky, JD
Zandbergen, S
Gibbs, HM
Khitrova, G
AF Hendrickson, J.
Homyk, A.
Scherer, A.
Alasaarela, T.
Saynatjoki, A.
Honkanen, S.
Richards, B. C.
Kim, J-Y.
Lee, Y-H.
Gibson, R.
Gehl, M.
Olitzky, J. D.
Zandbergen, S.
Gibbs, H. M.
Khitrova, G.
BE Jahnke, F
TI One-dimensional photonic crystal nanobeam cavities
SO QUANTUM OPTICS WITH SEMICONDUCTOR NANOSTRUCTURES
SE Woodhead Publishing Series in Electronic and Optical Materials
LA English
DT Article; Book Chapter
DE photonic crystals; nanophotonics; microcavities; atomic layer deposition
ID ATOMIC-LAYER DEPOSITION; SINGLE-QUANTUM-DOT; INHIBITED SPONTANEOUS
EMISSION; WAVE-GUIDES; SURFACE-CHEMISTRY; TITANIUM-DIOXIDE; INVERSE
DESIGN; QUALITY-FACTOR; THIN-FILMS; NANOCAVITY
AB The design, fabrication, and characterization of passive one-dimensional photonic crystal nanobeam cavities is presented. Silicon is chosen as the material system due to its ability to provide very high quality factors, a necessary prerequisite for solid state cavity quantum electrodynamics experiments, and its applicability to large scale hybrid device integration. Use of atomic layer deposition to conformally coat silicon on insulator nanobeam cavities with 20 nm of Al2O3 is shown to increase quality factors by an average of 35% and a maximum of 124%.
C1 [Hendrickson, J.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Homyk, A.; Scherer, A.] CALTECH, Pasadena, CA 91125 USA.
[Homyk, A.; Scherer, A.] CALTECH, Kavli Nanosci Inst, Pasadena, CA 91125 USA.
[Alasaarela, T.; Saynatjoki, A.; Honkanen, S.] Aalto Univ, Sch Elect Engn, Dept Micro & Nanosci, Aalto 00076, Finland.
[Richards, B. C.] Emcore Photovolta, Albuquerque, NM USA.
[Kim, J-Y.; Lee, Y-H.] Korea Adv Inst Sci & Technol, Dept Phys, Taejon 305701, South Korea.
[Gibson, R.; Gehl, M.; Olitzky, J. D.; Zandbergen, S.; Gibbs, H. M.; Khitrova, G.] Univ Arizona, Coll Opt Sci, Tucson, AZ 85721 USA.
RP Hendrickson, J (reprint author), USAF, Res Lab, Sensors Directorate, 2241 Avion Circle,Bldg 600, Wright Patterson AFB, OH 45433 USA.
EM joshua.hendrickson@wpafb.af.mil; homyk@caltech.edu;
tapani.alasaarela@aalto.fi; antti.saynatjoki@tkk.fi;
seppo.honkanen@tkk.fi; peterfish.jy@gmail.com; pcvcsel@gmail.com;
rgibson@optics.arizona.edu; mgehl@optics.arizona.edu;
jolitzky@optics.arizon.edu; szandbergen@optics.arizona.edu;
hyattgibbs@att.net; galina@optics.arizona.edu
NR 89
TC 0
Z9 0
U1 0
U2 0
PU WOODHEAD PUBL LTD
PI CAMBRIDGE
PA ABINGTON HALL ABINGTON, CAMBRIDGE CB1 6AH, CAMBS, ENGLAND
SN 2050-1501
BN 978-0-85709-639-5; 978-0-85709-232-8
J9 WOODH PUB SER ELECT
PY 2012
IS 28
BP 421
EP 446
PG 26
WC Materials Science, Multidisciplinary; Optics; Physics, Applied
SC Materials Science; Optics; Physics
GA BEB11
UT WOS:000315965900014
ER
PT B
AU Oswald, JM
AF Oswald, Justin M.
BE Eliason, EA
Tuleja, T
TI Know Thy Enemy Camel Spider Stories among US Troops in the Middle East
SO WARRIOR WAYS: EXPLORATIONS IN MODERN MILITARY FOLKLORE
LA English
DT Article; Book Chapter
ID VAGINA-DENTATA
C1 [Oswald, Justin M.] USAF, Arlington, VA USA.
RP Oswald, JM (reprint author), George Mason Univ, Master Arts Interdisciplinary Studies Program, Fairfax, VA 22030 USA.
NR 32
TC 0
Z9 0
U1 0
U2 1
PU UTAH STATE UNIV PRESS
PI LOGAN
PA UTAH STATE UNIV, LOGAN, UTAH 84322 USA
BN 978-0-87421-903-6
PY 2012
BP 38
EP 57
DI 10.7330/9780874219043.c02
PG 20
WC Folklore
SC Arts & Humanities - Other Topics
GA BDZ84
UT WOS:000315738800003
ER
PT S
AU Mattamana, A
Groves, K
Orlando, P
Patel, VJ
Quach, T
Watson, P
Johnson, L
Wyatt, P
Chen, CL
Chen, CK
Drangmeister, R
Keast, C
AF Mattamana, A.
Groves, K.
Orlando, P.
Patel, V. J.
Quach, T.
Watson, P.
Johnson, L.
Wyatt, P.
Chen, C. L.
Chen, C. K.
Drangmeister, R.
Keast, C.
GP IEEE
TI X-Band Receiver Module in Fully Depleted Silicon On Insulator Technology
SO IEEE INTERNATIONAL SOI CONFERENCE
SE IEEE International SOI Conference
LA English
DT Proceedings Paper
CT IEEE International SOI Conference
CY OCT 01-04, 2012
CL Napa, CA
SP IEEE, Electron Devices Soc, IEEE
AB This paper reports on the successful demonstration of radio frequency (RF) components in support of an integrated wide band/high dynamic range X-band receiver in 180-nm fully-depleted (FD) SOI CMOS technology. The demonstrated microwave monolithic integrated circuit (MMIC) includes an X-band low noise amplifier (LNA), Marchand balun, balanced amplifiers, double balanced mixer, non-reflective filter, and an IF amplifier. The X-band receiver front end module yielded a gain of 13.5-15 dB, 5.2-5.8 dB noise figure (NF), across the frequency band (3.7-4.3 GHz).
C1 [Mattamana, A.; Groves, K.; Orlando, P.; Patel, V. J.; Quach, T.; Watson, P.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Johnson, L.; Wyatt, P.; Chen, C. L.; Chen, C. K.; Drangmeister, R.; Keast, C.] MIT, Lincoln Lab, Lexington, MA 02420 USA.
RP Mattamana, A (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Aji.mattamana@wpafb.af.mil
NR 5
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1078-621X
BN 978-1-4673-2690-2; 978-1-4673-2689-6
J9 IEEE INT SOI CONF
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology
SC Engineering; Science & Technology - Other Topics
GA BDW62
UT WOS:000315378300037
ER
PT S
AU Albrecht, AR
Seletskiy, DV
Hains, CP
Cederberg, JG
Di Lieto, A
Tonelli, M
Balakrishnan, G
Sheik-Bahae, M
AF Albrecht, Alexander R.
Seletskiy, Denis V.
Hains, Christopher P.
Cederberg, Jeffrey G.
Di Lieto, Alberto
Tonelli, Mauro
Balakrishnan, Ganesh
Sheik-Bahae, Mansoor
GP IEEE
TI Intracavity Laser Cooling Using a VECSEL
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB We demonstrate intracavity laser cooling inside of a VECSEL, where the temperature of a Yb:YLF crystal was lowered by 20 K. We outline future improvements, striving towards a compact, efficient cryocooler device.
C1 [Albrecht, Alexander R.; Seletskiy, Denis V.; Sheik-Bahae, Mansoor] Univ New Mexico, Dept Phys & Astron, 800 Yale Blvd NE, Albuquerque, NM 87131 USA.
[Albrecht, Alexander R.; Hains, Christopher P.; Balakrishnan, Ganesh] Univ New Mexico, Ctr High Technol Mat, Albuquerque, NM 87106 USA.
[Di Lieto, Alberto; Tonelli, Mauro] Univ Pisa, NEST CNR, Dipartimento Fis, I-56127 Pisa, Italy.
[Seletskiy, Denis V.] Air Force Res Lab, Kirtland AFB, NM 87117 USA.
[Cederberg, Jeffrey G.] Sandia Natl Labs, Albuquerque, NM 87185 USA.
RP Albrecht, AR (reprint author), Univ New Mexico, Dept Phys & Astron, 800 Yale Blvd NE, Albuquerque, NM 87131 USA.
EM albrecht@chtm.unm.edu
FU Air Force Research Laboratory; DARPA; Sandia's Laboratory Directed
Research and Development Office; U.S. Department of Energy's National
Nuclear Security Administration [DE-AC04-94AL85000]
FX Research in part was performed while DVS held a National Research
Council Research Associateship Award at the Air Force Research
Laboratory. This work was supported by a DARPA Seedling funding. VECSEL
growth was supported by Sandia's Laboratory Directed Research and
Development Office. Sandia National Laboratories is a multi-program
laboratory managed and operated by Sandia Corporation, a wholly owned
subsidiary of Lockheed Martin Corporation, for the U.S. Department of
Energy's National Nuclear Security Administration under contract
DE-AC04-94AL85000.
NR 6
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362403144
ER
PT S
AU Gonzalez, LP
Upchurch, DC
Schunemann, PG
Mohnkern, L
Guha, S
AF Gonzalez, Leonel P.
Upchurch, Derek C.
Schunemann, Peter G.
Mohnkern, Lee
Guha, Shekhar
GP IEEE
TI High Power Continuous Wave Second Harmonic Generation of a Tunable CO2
Laser Using Orientation Patterned GaAs
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB High power frequency doubling of a tunable continuous wave CO2 laser in orientation patterned GaAs is demonstrated. Second harmonic powers of 300 mW at 4.785 mu m were obtained from a 4 cm long crystal at incident pump powers of over 30 W. (C) 2011 Optical Society of America
C1 [Gonzalez, Leonel P.; Upchurch, Derek C.; Guha, Shekhar] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Upchurch, Derek C.] UES Inc, Dayton, OH 45432 USA.
[Schunemann, Peter G.; Mohnkern, Lee] BAE Syst Inc, Nashua, NH 03061 USA.
RP Gonzalez, LP (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
NR 2
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362401025
ER
PT S
AU Jain, A
Spiegelberg, C
Smirnov, V
Bochove, E
Glebov, L
AF Jain, Apurva
Spiegelberg, Christine
Smirnov, Vadim
Bochove, Erik
Glebov, Leonid
GP IEEE
TI Efficient Coherent Beam Combining of Fiber Lasers Using Multiplexed
Volume Bragg Gratings
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB Highly efficient, stable, and scalable passive coherent beam combining of fiber lasers using multiplexed volume Bragg gratings is presented. We report combining efficiency of >90% for two channels and demonstrate channel scalability to four channels.
C1 [Jain, Apurva; Glebov, Leonid] Univ Cent Florida, CREOL, Coll Opt & Photon, Orlando, FL 32816 USA.
[Spiegelberg, Christine; Smirnov, Vadim] OptiGrade, Orlando, FL 32816 USA.
[Bochove, Erik] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
RP Jain, A (reprint author), Univ Cent Florida, CREOL, Coll Opt & Photon, Orlando, FL 32816 USA.
EM ajain@creol.ucf.edu
NR 2
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362400171
ER
PT S
AU Li, CY
Seletskiy, DV
Cederberg, JG
Sheik-Bahae, M
AF Li, Chia-Yeh
Seletskiy, Denis V.
Cederberg, Jeffrey G.
Sheik-Bahae, Mansoor
GP IEEE
TI Quantum-Well Electro-Absorption Sampling for Broadband THz Detection
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB Broad-band THz detection is demonstrated using GaAs/AlGaAs asymmetric double quantum-well structures. Transient electro-absorption modulation by the THz pulses is sampled coherently with detection bandwidth exceeding 10 THz.
C1 [Li, Chia-Yeh; Seletskiy, Denis V.; Sheik-Bahae, Mansoor] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA.
[Cederberg, Jeffrey G.] Sandia Natl Labs, Albuquerque, NM USA.
[Seletskiy, Denis V.] Air Force Res Lab, Kirtland AFB, NM USA.
RP Li, CY (reprint author), Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA.
EM cyli@unm.edu
NR 7
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362403213
ER
PT S
AU Locke, T
Pochet, M
Usechak, NG
AF Locke, T.
Pochet, M.
Usechak, N. G.
GP IEEE
TI On-Off Keyed Microwave Signal Optically Generated Using an
Optically-Injected Fabry-Perot Semiconductor Laser
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB Large-signal direct-modulation of a diode laser optically-injected into period-one operation is shown to produce an on-off keyed microwave signal. The signal is highly tunable and transmitted over 50 km, suitable for radio-over-fiber applications. (C)2012 Optical Society of America
C1 [Locke, T.; Pochet, M.] USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Usechak, N. G.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Locke, T (reprint author), USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM michael.pochet@afit.edu
FU AFOSR LRIR [09RY04COR]
FX N. Usechak was funded by AFOSR LRIR 09RY04COR. The authors thank V.
Kovanis for his support. The views expressed in this article are those
of the author & do not reflect the official policy or position of the
United States Air Force, Department of Defense, or the U.S. Government
NR 6
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362402208
ER
PT S
AU Lu, CA
Flores, A
Bochove, E
Roach, WP
Smirnov, V
Glebov, LB
AF Lu, Chunte A.
Flores, Angel
Bochove, Erik
Roach, William P.
Smirnov, Vadim
Glebov, Leonid B.
GP IEEE
TI A Coherent Beam Combination of Fiber Laser Arrays via Multiplexed Volume
Bragg Gratings
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB We report the first experimental demonstration of active coherently combining of fiber laser arrays with multiplexed volume Bragg gratings up to 70W combined output power with diffraction limited beam quality achieved at 82% combining efficiency.
C1 [Lu, Chunte A.; Flores, Angel; Bochove, Erik; Roach, William P.] USAF, Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
[Smirnov, Vadim] OptiGrate Corp, Orlando, FL 32826 USA.
[Glebov, Leonid B.] Univ Cent Florida, CREOL Coll Opt & Photon, Orlando, FL 32826 USA.
RP Lu, CA (reprint author), USAF, Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM chunte.lu@kirtland.af.mil
NR 5
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362400165
ER
PT S
AU Patnaik, AK
Roy, S
Gord, JR
AF Patnaik, Anil. K.
Roy, Sukesh
Gord, James R.
GP IEEE
TI Concurrent slow-fast light pair with controllable X-type dispersion
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB We demonstrate how simultaneous normal and anomalous (X-type) dispersion can be realized in a doubly driven double-ladder configuration and employed to obtain simultaneous slow-fast light. (C) 2011 Optical Society of America
C1 [Patnaik, Anil. K.; Gord, James R.] USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
[Patnaik, Anil. K.] Wright State Univ, Dept Phys, Dayton, OH 45435 USA.
[Roy, Sukesh] LLC, Spectral Energies, Dayton, OH 45431 USA.
RP Patnaik, AK (reprint author), USAF, Res Lab, Prop Directorate, Wright Patterson AFB, OH 45433 USA.
EM anil.patnaik@wpafb.af.mil
NR 6
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362402294
ER
PT S
AU Phillips, CR
Langrock, C
Fejer, MM
Jiang, J
Hartl, I
Fermann, ME
Lin, A
Harris, JS
Snure, M
Bliss, D
Zhu, M
AF Phillips, C. R.
Langrock, C.
Fejer, M. M.
Jiang, J.
Hartl, I.
Fermann, M. E.
Lin, A.
Harris, J. S.
Snure, M.
Bliss, D.
Zhu, M.
GP IEEE
TI Tunable Mid-Infrared Source Based on Difference Frequency Generation of
a Femtosecond Tm-fiber System in Orientation Patterned GaAs
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB We demonstrate a mid-infrared source tunable from 6.7-12.7 mm via difference frequency generation in orientation-patterned GaAs, with 1.3 mW average output power. The input pulses are generated from a femtosecond Tm-doped-fiber laser system.
C1 [Phillips, C. R.; Langrock, C.; Fejer, M. M.] Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA.
[Jiang, J.; Hartl, I.; Fermann, M. E.] IMRA Amer Inc, Ann Arbor, MI 48105 USA.
[Lin, A.; Harris, J. S.] Stanford Univ, Solid State Photon Lab, Stanford, CA 94305 USA.
[Snure, M.; Bliss, D.] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Zhu, M.] Agilent Technol, Agilent Labs, Santa Clara, CA 95051 USA.
RP Phillips, CR (reprint author), Stanford Univ, Edward L Ginzton Lab, Stanford, CA 94305 USA.
EM chris.phillips@stanford.edu
NR 4
TC 0
Z9 0
U1 0
U2 3
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362400181
ER
PT S
AU Pritchett, TM
Sun, WF
Zhang, BG
Li, YJ
Haley, JE
AF Pritchett, Timothy M.
Sun, Wenfang
Zhang, Bingguang
Li, Yunjing
Haley, Joy E.
GP IEEE
TI Z-scan Measurements of the Excited State Absorption Cross Sections of a
Benzothiazolylfluorenylethynyl-Substituted Terpyridyl Platinum(II)
Complex
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
ID PHOTOPHYSICS
AB Using Z scans employing 4.1-ns and 21-ps pulses, values of 4.0x10(-17) cm(2) and 4.2x10(-17) cm(2) were obtained for the singlet and triplet excited-state absorption cross sections of 4'-[2-(7-benzothiazolyl-9,9-diethylfluoren-2-yl) ethynyl]-2,2':6',2 ''-terpyridyl platinum(II) chloride at 532 nm. (C) 2012 Optical Society of America
C1 [Pritchett, Timothy M.] USA, Res Lab, RDRL SEE M, 2800 Powder Mill Rd, Adelphi, MD 20783 USA.
[Sun, Wenfang; Zhang, Bingguang; Li, Yunjing] North Dakota State Univ, Dept Chem & Biochem, Fargo, ND 58108 USA.
[Haley, Joy E.] Materials & Mfg Directorate, Air Force Res lab, Wright Patterson AFB, OH 45433 USA.
RP Pritchett, TM (reprint author), USA, Res Lab, RDRL SEE M, 2800 Powder Mill Rd, Adelphi, MD 20783 USA.
EM timothy.m.pritchett.civ@mail.mil
NR 6
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362400045
ER
PT S
AU Prokopeva, LJ
Brown, DP
Ni, X
Drachev, VP
Urbas, AM
Kildishev, AV
AF Prokopeva, L. J.
Brown, D. P.
Ni, X.
Drachev, V. P.
Urbas, A. M.
Kildishev, A. V.
GP IEEE
TI Pulse shaping using optical metamaterials with naturally anisotropic
structural elements
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB We numerically investigate a sub-class of metamaterials with anisotropic structural elements. We show such a metamaterial allows for placing electric and magnetic resonance bands close together, hence providing flexible manipulation of optical pulses.
C1 [Prokopeva, L. J.; Ni, X.; Drachev, V. P.; Kildishev, A. V.] Purdue Univ, Sch Elect & Comp Engn, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
[Prokopeva, L. J.] Russian Acad Sci, Inst Computat Technol, Siberian Branch, Moscow 117901, Russia.
[Brown, D. P.] UES Inc, Beavercreek, OH USA.
[Urbas, A. M.] US Air Force, Res Labs, Mat & Mfg Directorate, Washington, DC USA.
RP Kildishev, AV (reprint author), Purdue Univ, Sch Elect & Comp Engn, Birck Nanotechnol Ctr, W Lafayette, IN 47907 USA.
EM kildishev@purdue.edu
RI Ni, Xingjie/I-2235-2012
OI Ni, Xingjie/0000-0001-7405-5678
FU AFRL Materials and Manufacturing Directorate Applied Metamaterials
Program
FX This work was supported by the AFRL Materials and Manufacturing
Directorate Applied Metamaterials Program with helpful assistance by
UES, Inc.
NR 7
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362403045
ER
PT S
AU Schmitt-Sody, A
Lucero, A
O'Loughlin, J
Roach, WP
Noojin, GD
Cain, CP
AF Schmitt-Sody, A.
Lucero, A.
O'Loughlin, J.
Roach, W. P.
Noojin, G. D.
Cain, C. P.
GP IEEE
TI Electromagnetic field coupled to filaments in air for plasma
characterization studies
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB We present new insights into laser filament coupling to a high AC electric field strength of 100kV/m. Previous studies showed a short delay time for filament coupling. Our observations indicate a large time delay between the plasma and the discharge of the high field strength.
C1 [Schmitt-Sody, A.; Lucero, A.; O'Loughlin, J.; Roach, W. P.] USAF, Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
[Noojin, G. D.; Cain, C. P.] RDHO, HWP, Ft Sam Houston, TX 78234 USA.
RP Schmitt-Sody, A (reprint author), USAF, Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM andreas.schmitt-sody@kirtland.af.mil
NR 5
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362402330
ER
PT S
AU Schunemann, PG
Mohnkern, L
Vera, A
Yang, XPS
Lin, AC
Harris, JS
Tassev, V
Snure, M
AF Schunemann, Peter G.
Mohnkern, Lee
Vera, Alice
Yang, Xiaoping S.
Lin, Angie C.
Harris, James S.
Tassev, Vladimir
Snure, Michael
GP IEEE
TI Development of a low-loss, non-critically phase-matched, 1-mu m-pumpable
ZGP analog for the mid-infrared
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
ID NONLINEAR-OPTICAL DEVICES; SUBLATTICE REVERSAL; GROWTH; EPITAXY; GAP
AB Here we report on recent advances in the development of orientation-patterned gallium phosphide (OP-GaP) - a low loss, non-critically phase-matched, 1-mu m-pumpable binary analog of ZGP with three times the thermal conductivity for high power applications. (C) 2012 Optical Society of America
C1 [Schunemann, Peter G.; Mohnkern, Lee; Vera, Alice; Yang, Xiaoping S.] BAE Syst Inc, MER15-1813,POB 868, Nashua, NH 03061 USA.
[Lin, Angie C.; Harris, James S.] Stanford Univ, Paul G Allen Ctr Integrated Syst, Stanford, CA 94305 USA.
[Tassev, Vladimir; Snure, Michael] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Schunemann, PG (reprint author), BAE Syst Inc, MER15-1813,POB 868, Nashua, NH 03061 USA.
EM peter.g.schunemann@baesystems.com
NR 6
TC 0
Z9 0
U1 0
U2 5
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362400470
ER
PT S
AU Shin, JC
Mohseni, P
Tomasulo, S
Montgomery, K
Lee, M
Li, XL
AF Shin, Jae Cheol
Mohseni, Parsian
Tomasulo, Stephanie
Montgomery, Kyle
Lee, Minjoo
Li, Xiuling
GP IEEE
TI Heterogeneous Integration of III-V on Si: overcoming the
lattice-mismatch barrier via the 1D route
SO 2012 CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO)
SE Conference on Lasers and Electro-Optics
LA English
DT Proceedings Paper
CT Conference on Lasers and Electro-Optics (CLEO)
CY MAY 06-11, 2012
CL San Jose, CA
AB we demonstrate one-dimensional heteroepitaxy of InxGa1-xAs nanowires in the entire composition range on silicon substrates without dislocations. Doping and interfaces are characterized. Applications including improving the silicon solar cell efficiency will be presented. (C)2012 Optical Society of America
C1 [Shin, Jae Cheol; Mohseni, Parsian; Li, Xiuling] Univ Illinois, Dept Elect & Comp Engn, 1406 W Green St, Urbana, IL 61801 USA.
[Tomasulo, Stephanie; Lee, Minjoo] Yale Univ, Dept Elect Engn, New Haven, CT 06520 USA.
[Montgomery, Kyle] US Air Force, Res Lab, Kirtland AFB, NM 87117 USA.
RP Shin, JC (reprint author), Univ Illinois, Dept Elect & Comp Engn, 1406 W Green St, Urbana, IL 61801 USA.
EM xiuling@uiuc.edu
NR 0
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2160-9020
BN 978-1-55752-933-6
J9 CONF LASER ELECTR
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Optics; Physics, Applied
SC Engineering; Optics; Physics
GA BCK05
UT WOS:000310362400206
ER
PT S
AU Vincent, RA
Chun, FK
Dearborn, ME
Tippets, RD
AF Vincent, R. Anthony
Chun, Francis K.
Dearborn, Michael E.
Tippets, Roger D.
BE McLean, IS
Ramsay, SK
Takami, H
TI Analysis of Stellar Radiance Contamination in Observed Satellite Spectra
SO GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY IV
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Ground-Based and Airborne Telescopes IV
CY JUL 01-06, 2012
CL Amsterdam, NETHERLANDS
SP SPIE
DE slitless spectroscopy; space situational awareness; satellite spectra;
stellar contamination
ID SPECTROSCOPY
AB Reflectance spectra of Earth orbiting satellites can be readily observed with small diameter telescopes (D < 1 m) by utilizing a method known as slitless spectroscopy. Satellite spectra can be observed by simply placing a transmission grating within the collimated optical path of the telescope without the need to image through a slit. The simplicity of the slitless spectroscopy design makes it a promising alternative to spatially resolving satellites with larger and more expensive diameter telescopes for applications of space situational awareness. However, accurately observing satellite reflectance spectra without imaging through a slit requires a dark and homogeneous background. This requirement is frequently violated as background stars streak across the image due to the slewing motion of the telescope during satellite tracking. Rather than throwing out all images with noticeable stellar contamination, a principle component analysis of contaminated images from three geostationary satellite observations showed that it may still be possible to assess and identify satellite characteristics depending upon the amount of stellar contamination in the spectral region of interest. Additionally, a simple technique for automatic removal of contaminated frames is proposed based on an outlier analysis using Gaussian statistics and was found to successfully remove all significantly contaminated frames.
C1 [Vincent, R. Anthony; Chun, Francis K.; Dearborn, Michael E.; Tippets, Roger D.] USAF Acad, Dept Phys, Colorado Springs, CO 80840 USA.
RP Vincent, RA (reprint author), USAF Acad, Dept Phys, 2354 Fairchild Dr, Colorado Springs, CO 80840 USA.
NR 8
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9147-3
J9 PROC SPIE
PY 2012
VL 8446
AR 84464H
DI 10.1117/12.925415
PG 10
WC Engineering, Aerospace; Instruments & Instrumentation; Optics
SC Engineering; Instruments & Instrumentation; Optics
GA BDL69
UT WOS:000313675900136
ER
PT B
AU Musselman, R
Parker, D
Hadjis, J
Francis, D
Wind, J
Walker, N
AF Musselman, Randall
Parker, Daniel
Hadjis, John
Francis, Derek
Wind, Jordan
Walker, Nathan
GP IEEE
TI Circular Array for Satcom Interference Rejection
SO 2012 IEEE INTERNATIONAL CONFERENCE ON WIRELESS INFORMATION TECHNOLOGY
AND SYSTEMS (ICWITS)
LA English
DT Proceedings Paper
CT IEEE International Conference on Wireless Information Technology and
Systems (ICWITS)
CY NOV 11-16, 2012
CL Maui, HI
SP IEEE, IEEE Antennas & Propagat Soc, IEEE Commun Soc, IEEE Microwave Theory & Techniques Soc (IEEE MTT-S), Agilent Technologies, Natl Sci Fdn (NSF), Anritsu
DE phased array; patch antenna; interference
AB A useful application of antenna arrays is interference rejection. This paper describes a circular antenna array that was designed to reject interference in a mobile satellite receiver from a close-proximity source of interference. Since this interference source can move relative to the satellite antenna, the antenna array must adaptively adjust its null direction accordingly. The particular design of the circular array necessitated a significant size reduction in the radiating elements. Therefore, size reduction techniques were applied to circular patch antennas to allow them to fit in the circular array.
C1 [Musselman, Randall; Parker, Daniel; Hadjis, John; Francis, Derek; Wind, Jordan; Walker, Nathan] US Air Force Acad, Dept Elect Engn, Colorado Springs, CO 80840 USA.
RP Musselman, R (reprint author), US Air Force Acad, Dept Elect Engn, Colorado Springs, CO 80840 USA.
NR 7
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0947-9; 978-1-4673-0946-2
PY 2012
PG 4
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BDT38
UT WOS:000314775300005
ER
PT S
AU Vongsy, K
Mendenhall, MJ
Eismann, MT
Peterson, GL
AF Vongsy, Karmon
Mendenhall, Michael J.
Eismann, Michael T.
Peterson, Gilbert L.
GP IEEE
TI REMOVING PARALLAX-INDUCED CHANGES IN HYPERSPECTRAL CHANGE DETECTION
SO 2012 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS)
SE IEEE International Symposium on Geoscience and Remote Sensing IGARSS
LA English
DT Proceedings Paper
CT IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
CY JUL 22-27, 2012
CL Munich, GERMANY
SP IEEE, IEEE Geosci & Remote Sensing Soc, DLR, ESA
DE Change detection; hyperspectral images
ID SCALE
AB Hyperspectral-based change detection is often inadvertently affected by image artifacts, reducing the accuracy of the change detector. We present a Hyperspectral Change Detection (HSCD) process to distinguish parallax-induced change from legitimate change. Image parallax decreases the accuracy of change detection results. The approach introduced in this paper utilizes a combination of a spectral change detector and stereo geometry to reduce parallax-induced false alarms. Image parallax is determined by considering the error in the epipolar constraint, meaning the corresponding points between two images must lie on epipolar lines. Experimental analysis shows a false alarm reduction by nearly one order of magnitude on synthetic hyperspectral imagery and nearly two orders of magnitude on real hyperspectral imagery.
C1 [Vongsy, Karmon; Mendenhall, Michael J.; Peterson, Gilbert L.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
RP Vongsy, K (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
NR 11
TC 1
Z9 1
U1 1
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-6996
BN 978-1-4673-1159-5
J9 INT GEOSCI REMOTE SE
PY 2012
BP 2012
EP 2015
DI 10.1109/IGARSS.2012.6350982
PG 4
WC Engineering, Electrical & Electronic; Geosciences, Multidisciplinary;
Remote Sensing
SC Engineering; Geology; Remote Sensing
GA BDG99
UT WOS:000313189402052
ER
PT S
AU Wallis, K
Akers, G
Collins, P
Davis, R
Frazier, A
Oxley, M
Terzuoli, A
AF Wallis, Kristen
Akers, Geoffrey
Collins, Peter
Davis, Richard
Frazier, Alan
Oxley, Mark
Terzuoli, Andrew
GP IEEE
TI COMPLEX EMPIRICAL MODE DECOMPOSITION, HILBERT-HUANG TRANSFORM, AND
FOURIER TRANSFORM APPLIED TO MOVING OBJECTS
SO 2012 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS)
SE IEEE International Symposium on Geoscience and Remote Sensing IGARSS
LA English
DT Proceedings Paper
CT IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
CY JUL 22-27, 2012
CL Munich, GERMANY
SP IEEE, IEEE Geosci & Remote Sensing Soc, DLR, ESA
DE Fourier transform; Empirical mode decomposition; Hilbert transform;
remote sensing
AB A review of current signal analysis tools show that new techniques are required for an enhanced fidelity or data integrity. Recently, the Hilbert-Huang transform (HHT) and its inherent property, the Empirical Mode Decomposition (EMD) technique, have been formerly investigated. The technique of Complex EMD (CEMD) was also explored. The scope of this work was to assess the CEMD technique as an innovative analysis tool. Subsequent to this, comparisons between applications of the Hilbert transform (HT) and the Fast-Fourier transform (FFT) were analyzed. MATLAB (R) was implemented to model signal decomposition and the execution of mathematical transforms for generating results. The CEMD technique successfully decomposed the data into its oscillatory modes. After comparative graphical analysis of the HT and FFT, application of the HT provided marginal enhancements of the data modeled previously by the FFT. Altogether, the HHT could not be determined as a helpful analysis tool. Nevertheless, the CEMD technique, an inherent component of the HHT, exhibited a possible improvement as an analysis tool for signal processing data. Further evaluation of the CEMD technique and the HHT is needed for ultimate determination of their usefulness as an analysis tool.
C1 [Wallis, Kristen; Akers, Geoffrey; Collins, Peter; Davis, Richard; Frazier, Alan; Oxley, Mark; Terzuoli, Andrew] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Wallis, K (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM a.j.terzuoli@ieee.org
NR 6
TC 0
Z9 0
U1 1
U2 6
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-6996
BN 978-1-4673-1159-5
J9 INT GEOSCI REMOTE SE
PY 2012
BP 4395
EP 4398
DI 10.1109/IGARSS.2012.6350399
PG 4
WC Engineering, Electrical & Electronic; Geosciences, Multidisciplinary;
Remote Sensing
SC Engineering; Geology; Remote Sensing
GA BDG99
UT WOS:000313189404115
ER
PT S
AU Herweg, J
Kerekes, J
Eismann, M
AF Herweg, Jared
Kerekes, John
Eismann, Michael
GP IEEE
TI HYPERSPECTRAL IMAGING PHENOMENOLOGY FOR THE DETECTION AND TRACKING OF
PEDESTRIANS
SO 2012 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS)
SE IEEE International Symposium on Geoscience and Remote Sensing IGARSS
LA English
DT Proceedings Paper
CT IEEE International Geoscience and Remote Sensing Symposium (IGARSS)
CY JUL 22-27, 2012
CL Munich, GERMANY
SP IEEE, IEEE Geosci & Remote Sensing Soc, DLR, ESA
DE Hyperspectral imaging; Pedestrian tracking; Target detection; Spectral
separability
AB The popularity of hyperspectral imaging in remote sensing continues to to be adapted in novel ways to overcome challenging imaging problems. This paper reports on some of the latest research efforts exploring the phenomenology of using hyperspectral imaging as an aid in detecting and tracking human pedestrians. An assessment of the likelihood of distinguishing between pedestrians given observable materials and based on signal-to-noise level is presented. Initial results indicate favorable separability can be achieved with signal-to-noise ratios as low as 13 for certain materials. Additionally, an overview of a real-world urban hyperspectral imaging data collection effort is presented.
C1 [Herweg, Jared] USAF, Inst Technol, Dayton, OH 45433 USA.
RP Herweg, J (reprint author), USAF, Inst Technol, Dayton, OH 45433 USA.
NR 16
TC 2
Z9 2
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-6996
BN 978-1-4673-1159-5
J9 INT GEOSCI REMOTE SE
PY 2012
BP 5482
EP 5485
DI 10.1109/IGARSS.2012.6352365
PG 4
WC Engineering, Electrical & Electronic; Geosciences, Multidisciplinary;
Remote Sensing
SC Engineering; Geology; Remote Sensing
GA BDG99
UT WOS:000313189405126
ER
PT S
AU Pochet, M
Locke, T
Harvey, E
Usechak, NG
AF Pochet, M.
Locke, T.
Harvey, E.
Usechak, N. G.
GP IEEE
TI Transient Response of a Modulated Microwave Subcarrier Generated Using
Optical Injection
SO 2012 IEEE PHOTONICS CONFERENCE (IPC)
SE IEEE Photonics Conference
LA English
DT Proceedings Paper
CT 25th IEEE Photonics Conference (IPC)
CY SEP 23-27, 2012
CL Burlingame, CA
SP IEEE, Kotura, Rockley Grp, Intel, Cisco, Oracle Labs, Corning, Google, Luxtera, Fiber Chip, Rambus, Analog Devices, PMC, Sinoora, Soitec, Photon Design, Nat Photon, Commun Technol Roadmap, Simgui
AB The transient response of a directly modulated injection-locked semiconductor laser operated in the period-one state is analyzed theoretically and verified experimentally. The results illustrate the limits and stability properties of the modulated microwave subcarrier frequency.
C1 [Pochet, M.; Locke, T.; Harvey, E.] USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Usechak, N. G.] IUS Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Pochet, M (reprint author), USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM michael.pochet@afit.edu
FU Air Force Office of Scientific Research
FX N. Usechak was funded by the Air Force Office of Scientific Research.
The views expressed in this article are those of the authors and do not
reflect the official policy or position of the United States Air Force,
Department of Defense, or the U. S. Government.
NR 5
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2374-0140
BN 978-1-4577-0733-9
J9 IEEE PHOTON CONF
PY 2012
BP 18
EP +
PG 2
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BDD75
UT WOS:000312865000010
ER
PT S
AU Loyall, J
Gillen, M
Cleveland, J
Usbeck, K
Sterling, J
Newkirk, R
Kohler, R
AF Loyall, Joseph
Gillen, Matthew
Cleveland, Jeffrey
Usbeck, Kyle
Sterling, Joshua
Newkirk, Richard
Kohler, Ralph
BE Shakshuki, E
Younas, M
TI Information Ubiquity in Austere Locations
SO ANT 2012 AND MOBIWIS 2012
SE Procedia Computer Science
LA English
DT Proceedings Paper
CT 3rd International Conference on Ambient Systems, Networks and
Technologies (ANT) / 9th International Conference on Mobile Web
Information Systems (MobiWIS)
CY AUG 27-29, 2012
CL Niagara Falls, CANADA
DE Publish-subscribe; information discovery; information brokering
AB In today's world, connectivity is increasingly taken for granted. Wireless networks, cell towers, and satellites provide ubiquitous connectivity through a number of devices. However, in austere locations constant connectivity cannot be assumed, e. g., due to the remoteness of the area, due to a disaster or combat situation, or due to insecurity or lack of access to available communications. This paper describes a system, Marti, which the authors have been developing and demonstrating that can provide inter-connectivity and access to information in austere locations. Marti is rapidly deployable and interoperates with a large number of existing devices and client applications. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of [name organizer]
C1 [Loyall, Joseph; Gillen, Matthew; Cleveland, Jeffrey; Usbeck, Kyle] Raytheon BBN Technol, 10 Moulton St, Cambridge, MA 02138 USA.
[Sterling, Joshua; Newkirk, Richard; Kohler, Ralph] Air Force Res Lab, Griffiss AFB, NY 13441 USA.
RP Loyall, J (reprint author), Raytheon BBN Technol, 10 Moulton St, Cambridge, MA 02138 USA.
EM jloyall@bbn.com
NR 15
TC 3
Z9 3
U1 0
U2 0
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1877-0509
J9 PROCEDIA COMPUT SCI
PY 2012
VL 10
BP 170
EP 178
DI 10.1016/j.procs.2012.06.025
PG 9
WC Computer Science, Hardware & Architecture; Computer Science, Theory &
Methods
SC Computer Science
GA BDQ15
UT WOS:000314400700021
ER
PT S
AU Chang, KC
Hsu, UK
Wang, WC
Tyan, RH
AF Chang, Keh-Chin
Hsu, Uzu-Kuei
Wang, Wei-Cheng
Tyan, Ron-Hwa
BE Lixiang, Z
TI Flow Visualization and Wind Uplift Analysis of a Suspended Solar Water
Heater
SO INTERNATIONAL CONFERENCE ON ADVANCES IN COMPUTATIONAL MODELING AND
SIMULATION
SE Procedia Engineering
LA English
DT Proceedings Paper
CT International Conference on Advances in Computational Modeling and
Simulation (ACMS)
CY DEC 14-16, 2011
CL Kunming, PEOPLES R CHINA
SP KMUST
DE solar water heater; heat collector; suspend; vortex; uplift
ID COLLECTORS; OUTLOOK; TAIWAN; ENERGY; LOADS
AB Typhoon is one of the major natural disasters in Taiwan. The solar water heater system installed in the house roof has the most serious damage caused by typhoon invasion. Because the wind blows into the backward of the solar water heater system, the heat collecter is damaged by the stronger wind pressure gradient induced between the upper and lower. This study was using CFD (Computational Fluid Dynamics) method to investigate the flowfield over a suspended and ground solar water heater during the wind speed about 30m/s, and compared the results with the experimental data for validation. Simulations of 60% solar water collector model with different tilt angles and 40% model with different guiding plate were also done in this study to investigate the effect of the guide plate. The result shows that the 3D flowfield effect is clear, and 2D model can not simulated the flowfield. The heat collector erected away from the ground can be reduced to the uplift, and the separation bubbles are induced behind the bucket of the heat collector surface. The cornner vortices generated and interacted from the collector-side, and the separation bubbles is extending in spanwise. The larger tilt angle of the solar collector causes the larger pressure difference in the leading edge. The guiding plate avoids the inflow directly hit the bottom of the solar collector, and it can efficiently reduce the leading edge pressure difference. Nevertheless, when the cross-sectional area of the guiding plate increase, the uplift force acted on heat collector decreases and the drag force would be increased. (C) 2011 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of Kunming University of Science and Technology
C1 [Hsu, Uzu-Kuei] USAF, Inst Technol, Dept Aircraft Engn, 1 Jyulun Rd, Kaohsiung 82063, Taiwan.
[Chang, Keh-Chin; Wang, Wei-Cheng; Tyan, Ron-Hwa] Natl Cheng Kung Univ, Inst Aeronaut & Astronaut, Tainan 70101, Taiwan.
RP Hsu, UK (reprint author), USAF, Inst Technol, Dept Aircraft Engn, 1 Jyulun Rd, Kaohsiung 82063, Taiwan.
EM ukhsu@ms48.hinet.net
RI Chang, Keh-Chin/B-4691-2015
OI Chang, Keh-Chin/0000-0002-4753-6406
FU Bureau of Energy, Ministry of Economic Affairs" [100-D0101]
FX The authors are grateful to the "Bureau of Energy, Ministry of Economic
Affairs" for financial support under contract number 100-D0101.
NR 14
TC 0
Z9 0
U1 0
U2 2
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1877-7058
J9 PROCEDIA ENGINEER
PY 2012
VL 31
BP 3
EP 8
DI 10.1016/j.proeng.2012.01.982
PG 6
WC Computer Science, Theory & Methods; Engineering, Multidisciplinary
SC Computer Science; Engineering
GA BDN81
UT WOS:000314094600002
ER
PT J
AU Pan, KC
Brown, D
Subramanyam, G
Penno, R
Jiang, H
Zhang, CH
Patterson, M
Kuhl, D
Leedy, K
Cerny, C
AF Pan, K. C.
Brown, D.
Subramanyam, G.
Penno, R.
Jiang, H.
Zhang, C. H.
Patterson, M.
Kuhl, D.
Leedy, K.
Cerny, C.
TI A Reconfigurable Coplanar Waveguide Bowtie Antenna Using an Integrated
Ferroelectric Thin-Film Varactor
SO INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
LA English
DT Article
ID MICROWAVE APPLICATIONS
AB A novel printed antenna with a frequency reconfigurable feed network is presented. The antenna consists of a bowtie structure patch radiating element in the inner space of an annulus that is on a nongrounded substrate with a ferroelectric (FE) Barium Strontium Titanate (BST) thin film. The bowtie patch is fed by a coplanar waveguide (CPW) transmission line that also includes a CPW-based BST shunt varactor. Reconfiguration of the compact 8 mm x 8 mm system has been demonstrated by shifting the antenna system's operating frequency 500 MHz in the 7-9 GHz band by applying a DC voltage bias.
C1 [Pan, K. C.; Brown, D.; Subramanyam, G.; Penno, R.; Jiang, H.; Zhang, C. H.; Patterson, M.] Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
[Kuhl, D.; Leedy, K.; Cerny, C.] USAF, Res Lab, Dayton, OH 45432 USA.
RP Brown, D (reprint author), Univ Dayton, Dept Elect & Comp Engn, 300 Coll Pk, Dayton, OH 45469 USA.
EM brownd7@udayton.edu
NR 7
TC 0
Z9 0
U1 1
U2 5
PU HINDAWI PUBLISHING CORPORATION
PI NEW YORK
PA 410 PARK AVENUE, 15TH FLOOR, #287 PMB, NEW YORK, NY 10022 USA
SN 1687-5869
J9 INT J ANTENN PROPAG
JI Int. J. Antennas Propag.
PY 2012
AR 249019
DI 10.1155/2012/249019
PG 6
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA 085ET
UT WOS:000314597800001
ER
PT J
AU Clare, AS
Cummings, ML
How, JP
Whitten, AK
Toupet, O
AF Clare, Andrew S.
Cummings, Mary L.
How, Jonathan P.
Whitten, Andrew K.
Toupet, Olivier
TI Operator Objective Function Guidance for a Real-Time Unmanned Vehicle
Scheduling Algorithm
SO JOURNAL OF AEROSPACE COMPUTING INFORMATION AND COMMUNICATION
LA English
DT Article
ID SUPERVISORY CONTROL; AIR VEHICLES; AUTOMATION; SYSTEMS; DESIGN; UAVS
AB Advances in autonomy have made it possible to invert the typical operator-to-unmanned-vehicle ratio so that a single operator can now control multiple heterogeneous unmanned vehicles. Algorithms used in unmanned-vehicle path planning and task allocation typically have an objective function that only takes into account variables initially identified by designers with set weightings. This can make the algorithm seemingly opaque to an operator and brittle under changing mission priorities. To address these issues, it is proposed that allowing operators to dynamically modify objective function weightings of an automated planner during a mission can have performance benefits. A multiple-unmanned-vehicle simulation test bed was modified so that operators could either choose one variable or choose any combination of equally weighted variables for the automated planner to use in evaluating mission plans. Results from a human-participant experiment showed that operators rated their performance and confidence highest when using the dynamic objective function with multiple objectives. Allowing operators to adjust multiple objectives resulted in enhanced situational awareness, increased spare mental capacity, fewer interventions to modify the objective function, and no significant differences in mission performance. Adding this form of flexibility and transparency to automation in future unmanned vehicle systems could improve performance, engender operator trust, and reduce errors.
C1 [Clare, Andrew S.; Cummings, Mary L.; How, Jonathan P.] MIT, Cambridge, MA 02139 USA.
[Whitten, Andrew K.] USAF, Flight Test Ctr, Edwards Afb, CA 93524 USA.
[Toupet, Olivier] Zee Aero, Mountain View, CA 94043 USA.
EM aclare@mit.edu; missyc@mit.edu; jhow@mit.edu;
andrew.whitten@edwards.af.mil; otoupet@zee.aero
OI How, Jonathan/0000-0001-8576-1930
FU Aurora Flight Sciences; U.S. Office of Naval Research
FX This research is sponsored by Aurora Flight Sciences and the U.S. Office
of Naval Research. Karl Kulling of Aurora Flight Sciences provided
extensive algorithm support. Cameron Fraser of the Massachusetts
Institute of Technology (MIT) Aerospace Controls Laboratory provided
test bed support. Han-Lim Choi of the MIT Aerospace Controls Laboratory
provided consensus-based bundle algorithm support.
NR 68
TC 11
Z9 11
U1 3
U2 7
PU AMER INST AERONAUT ASTRONAUT
PI RESTON
PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA
SN 1940-3151
J9 J AEROS COMP INF COM
JI J. Aerosp. Comput. Inf. Commun.
PY 2012
VL 9
IS 4
BP 161
EP 173
DI 10.2514/1.I010019
PG 13
WC Engineering, Aerospace
SC Engineering
GA 083KL
UT WOS:000314462300003
ER
PT J
AU Tsai, CC
Rubin, B
Tatartschuk, E
Owens, JR
Luzinov, I
Kornev, KG
AF Tsai, Chen-Chih
Rubin, Binyamin
Tatartschuk, Eugen
Owens, Jeffery R.
Luzinov, Igor
Kornev, Konstantin G.
TI Efficiency of Microwave Heating of Weakly Loaded Polymeric
Nanocomposites
SO JOURNAL OF ENGINEERED FIBERS AND FABRICS
LA English
DT Article; Proceedings Paper
CT International Symposium on New Frontiers in Fiber Materials Science
CY OCT 11-13, 2011
CL Charleston, SC
ID CARBON NANOTUBES
AB Electrical and thermal conductivity of materials are typically correlated, while some applications, including thermoelectrics, require these parameters to be controlled independently. Such independent control of thermal and electromagnetic properties can be achieved by using nanocomposites. In this study, nanocomposites were produced by mixing a small amount of carbon nanofibers (CNF), carbon coated cobalt (Co), and nickel nanowires (NiNW) with paraffin, which has low thermal and almost zero electrical conductivity. The fraction of nanoinclusions in the paraffin matrix was very low (below 1%). We showed that the thermal properties of nanocomposites are essentially the same as those of pure paraffin, while electromagnetic properties are significantly different. To determine the dependence of the heating rate on filler concentration, paraffin-based samples were heated in a microwave oven. We found that the heating rate of nanocomposites made of carbon nanofibers is much greater than that of any other nanocomposites. These findings suggest that at 2.45 GHz frequency, the heating rate is mostly controlled by the electrical losses in the fillers. The theoretical model predicts that the heating rate increases linearly with the particle concentration, which is in agreement with the experimental data.
C1 [Tsai, Chen-Chih; Rubin, Binyamin; Tatartschuk, Eugen; Luzinov, Igor; Kornev, Konstantin G.] Clemson Univ, Clemson, SC 29634 USA.
[Owens, Jeffery R.] USAF, Res Lab, Airbase Tech Div, Airbase Sci Branch, Panama City, FL 32403 USA.
RP Kornev, KG (reprint author), Clemson Univ, 161 Sirrine Hall, Clemson, SC 29634 USA.
EM kkornev@clemson.edu
NR 9
TC 2
Z9 2
U1 1
U2 11
PU INDA
PI CARY
PA PO BOX 1288, CARY, NC 27512-1288 USA
SN 1558-9250
J9 J ENG FIBER FABR
JI J. Eng. Fiber Fabr.
PY 2012
VL 7
SI SI
BP 42
EP 49
PG 8
WC Materials Science, Textiles
SC Materials Science
GA 083JT
UT WOS:000314460200008
ER
PT J
AU Collins, TJ
AF Collins, Timothy J.
TI Tomorrow's Warfighter Capability: Introduction
SO JOHNS HOPKINS APL TECHNICAL DIGEST
LA English
DT Editorial Material
AB This issue of The Johns Hopkins APL Technical Digest highlights some of the Precision Engagement Business Area's recent activities in the science and technology domain. These activities serve to advance the state of the art and offer evidence that emerging technologies are useful and applicable in the national security environment. The purpose of this issue is twofold: (i) to reorient readers to the salutary effects of science and technology achievement in the realm of precision engagement and (ii) to expose the breadth and depth of the current efforts in the Precision Engagement Business Area as it continues to make significant and meaningful contributions to delivering offensive combat capabilities. With its institutional heritage of 70 years, APL recognizes the contributions of our nation's scientists and engineers to America's rise in global power. Not unlike in our past, today's science and technology endeavors will provide the underpinnings of America's war-fighting capability for tomorrow.
C1 [Collins, Timothy J.] Johns Hopkins Univ, Appl Phys Lab, Execut Leadership Team, Laurel, MD 20703 USA.
[Collins, Timothy J.] USAF, Wright Patterson AFB, OH USA.
RP Collins, TJ (reprint author), Johns Hopkins Univ, Appl Phys Lab, Execut Leadership Team, Laurel, MD 20703 USA.
EM timothy.collins@jhuapl.edu
NR 8
TC 0
Z9 0
U1 0
U2 0
PU JOHNS HOPKINS UNIV
PI LAUREL
PA APPLIED PHYSICS LABORATORY ATTN: TECHNICAL DIGEST JOHN HOPKINS RD, BLDG
1W-131, LAUREL, MD 20723-6099 USA
SN 0270-5214
J9 J HOPKINS APL TECH D
JI Johns Hopkins APL Tech. Dig.
PY 2012
VL 31
IS 2
BP 88
EP 92
PN 1
PG 5
WC Engineering, Multidisciplinary
SC Engineering
GA 080HM
UT WOS:000314232300001
ER
PT J
AU Albertin, CB
Bonnaud, L
Brown, CT
Crookes-Goodson, WJ
da Fonseca, RR
Di Cristo, C
Dilkes, BP
Edsinger-Gonzales, E
Freeman, RM
Hanlon, RT
Koenig, KM
Lindgren, AR
Martindale, MQ
Minx, P
Moroz, LL
Nodl, MT
Nyholm, SV
Ogura, A
Pungor, JR
Rosenthal, JJC
Schwarz, EM
Shigeno, S
Strugnell, JM
Wollesen, T
Zhang, GJ
Ragsdale, CW
AF Albertin, Caroline B.
Bonnaud, Laure
Brown, C. Titus
Crookes-Goodson, Wendy J.
da Fonseca, Rute R.
Di Cristo, Carlo
Dilkes, Brian P.
Edsinger-Gonzales, Eric
Freeman, Robert M., Jr.
Hanlon, Roger T.
Koenig, Kristen M.
Lindgren, Annie R.
Martindale, Mark Q.
Minx, Patrick
Moroz, Leonid L.
Noedl, Marie-Therese
Nyholm, Spencer V.
Ogura, Atsushi
Pungor, Judit R.
Rosenthal, Joshua J. C.
Schwarz, Erich M.
Shigeno, Shuichi
Strugnell, Jan M.
Wollesen, Tim
Zhang, Guojie
Ragsdale, Clifton W.
TI Cephalopod genomics: A plan of strategies and organization
SO STANDARDS IN GENOMIC SCIENCES
LA English
DT Article
ID FLUKE SCHISTOSOMA-MANSONI; SEPIA-OFFICINALIS; BACTERIAL MUTUALISM;
LABORATORY CULTURE; OCTOPUS-VULGARIS; OPTIC GLAND; CUTTLEFISH;
EVOLUTION; SEQUENCE; MOLLUSKS
AB The Cephalopod Sequencing Consortium (CephSeq Consortium) was established at a NESCent Catalysis Group Meeting, "Paths to Cephalopod Genomics-Strategies, Choices, Organization," held in Durham, North Carolina, USA on May 24-27, 2012. Twenty-eight participants representing nine countries (Austria, Australia, China, Denmark, France, Italy, Japan, Spain and the USA) met to address the pressing need for genome sequencing of cephalopod mollusks. This group, drawn from cephalopod biologists, neuroscientists, developmental and evolutionary biologists, materials scientists, bioinformaticians and researchers active in sequencing, assembling and annotating genomes, agreed on a set of cephalopod species of particular importance for initial sequencing and developed strategies and an organization (CephSeq Consortium) to promote this sequencing. The conclusions and recommendations of this meeting are described in this white paper.
C1 [Albertin, Caroline B.; Ragsdale, Clifton W.] Univ Chicago, Dept Organismal Biol & Anat, Chicago, IL 60637 USA.
[Bonnaud, Laure] Univ Paris Diderot, Museum Natl Hist Nat, Paris, France.
[Brown, C. Titus] Michigan State Univ, Dept Comp Sci & Engn, E Lansing, MI 48824 USA.
[Brown, C. Titus] Michigan State Univ, Dept Microbiol & Mol Genet, E Lansing, MI 48824 USA.
[Crookes-Goodson, Wendy J.] USAF, Res Lab, Mat & Mfg Directorate, Soft Matter Mat Branch, Wright Patterson AFB, OH 45433 USA.
[da Fonseca, Rute R.] Univ Copenhagen, Nat Hist Museum Denmark, Copenhagen, Denmark.
[Di Cristo, Carlo] Univ Sannio, Dept Biol Geol & Environm Sci, Benevento, Italy.
[Dilkes, Brian P.] Purdue Univ, Dept Hort & Landscape Architecture, W Lafayette, IN 47907 USA.
[Edsinger-Gonzales, Eric] Univ Calif Berkeley, Dept Mol & Cell Biol, Berkeley, CA 94720 USA.
[Freeman, Robert M., Jr.] Harvard Univ, Sch Med, Dept Syst Biol, Boston, MA USA.
[Hanlon, Roger T.] Marine Biol Lab, Woods Hole, MA 02543 USA.
[Koenig, Kristen M.] Univ Texas Austin, Inst Cell & Mol Biol, Austin, TX 78712 USA.
[Lindgren, Annie R.] Portland State Univ, Dept Biol, Portland, OR 97207 USA.
[Martindale, Mark Q.] Univ Hawaii, Kewalo Marine Lab, Honolulu, HI 96822 USA.
[Minx, Patrick] Washington Univ, Sch Med, Genome Inst, St Louis, MO USA.
[Moroz, Leonid L.] Univ Florida, Whitney Lab Marine Biosci, St Augustine, FL USA.
[Noedl, Marie-Therese] Univ Vienna, Dept Theoret Biol, Vienna, Austria.
[Nyholm, Spencer V.] Univ Connecticut, Dept Mol & Cell Biol, Storrs, CT USA.
[Ogura, Atsushi] Univ Tokushima, Inst Genome Res, Tokushima 770, Japan.
[Pungor, Judit R.] Stanford Univ, Hopkins Marine Stn, Pacific Grove, CA 93950 USA.
[Rosenthal, Joshua J. C.] Univ Puerto Rico, Inst Neurobiol, San Juan, PR 00901 USA.
[Schwarz, Erich M.] Cornell Univ, Dept Mol Biol & Genet, Ithaca, NY USA.
[Shigeno, Shuichi] Japan Agcy Marine Earth Sci & Technol, Yokosuka, Kanagawa 2370061, Japan.
[Strugnell, Jan M.] La Trobe Univ, Dept Genet, Bundoora, Vic, Australia.
[Wollesen, Tim] Univ Vienna, Dept Integrat Zool, Vienna, Austria.
[Zhang, Guojie] BGI Shenzhen, Shenzhen, Peoples R China.
[Ragsdale, Clifton W.] Univ Chicago, Dept Neurobiol, Chicago, IL 60637 USA.
RP Ragsdale, CW (reprint author), Univ Chicago, Dept Organismal Biol & Anat, 1025 E 57th St, Chicago, IL 60637 USA.
EM cragsdale@uchicago.edu
RI da Fonseca, Rute/F-9143-2013; Zhang, Guojie/B-6188-2014; Strugnell,
Jan/P-9921-2016; Hanlon, Roger/Q-8687-2016; Dilkes, Brian/C-9293-2012;
OI Wollesen, Tim/0000-0003-0464-1254; da Fonseca, Rute/0000-0002-2805-4698;
Zhang, Guojie/0000-0001-6860-1521; Brown, C. Titus/0000-0001-6001-2677;
Hanlon, Roger/0000-0003-0004-5674; Dilkes, Brian/0000-0003-2799-954X;
Edsinger, Eric/0000-0002-1012-1506; BONNAUD-PONTICELLI,
Laure/0000-0001-7510-5032; Schwarz, Erich/0000-0003-3151-4381
FU National Science Foundation through the National Evolutionary Synthesis
Center (NESCent) [EF-0905606]
FX We thank Drs. Carlos Canchaya and David Glanzman who were unable to
attend the full meeting but contributed to our discussions and
decisions. The Catalysis Group Meeting was supported by the National
Science Foundation through the National Evolutionary Synthesis Center
(NESCent) under grant number NSF #EF-0905606.
NR 79
TC 18
Z9 18
U1 2
U2 38
PU BIOMED CENTRAL LTD
PI LONDON
PA 236 GRAYS INN RD, FLOOR 6, LONDON WC1X 8HL, ENGLAND
SN 1944-3277
J9 STAND GENOMIC SCI
JI Stand. Genomic Sci.
PY 2012
VL 7
IS 1
BP 175
EP 188
DI 10.4056/sigs.3136559
PG 14
WC Genetics & Heredity; Microbiology
SC Genetics & Heredity; Microbiology
GA 082QB
UT WOS:000314405900018
PM 23451296
ER
PT S
AU Reising, DR
Temple, MA
AF Reising, Donald R.
Temple, Michael A.
GP IEEE
TI WiMAX Mobile Subscriber Verification Using Gabor-Based RF-DNA
Fingerprints
SO 2012 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC)
SE IEEE International Conference on Communications
LA English
DT Proceedings Paper
CT IEEE International Conference on Communications (ICC)
CY JUN 10-15, 2012
CL Ottawa, CANADA
SP IEEE
AB Considerable effort has been put forth to exploit physical layer attributes to augment network bit-level security mechanisms. RF-DNA fingerprints possess such attributes and can be used to uniquely identify authorized users and mitigate unauthorized network activity. These attributes are unique to a given electronic device and difficult to replicate for cloning, spoofing, etc. Device discrimination (identification) of WiMAX devices has been successfully demonstrated using a one-to-many comparison against a pool of unknown device fingerprints. The work here now addresses device authentication using a one-to-one comparison against the specific fingerprint associated with a claimed bit-level identity (MAC, SIM, IMEI, etc). The concept is demonstrated using Gabor-based RF-DNA extracted from near-transient burst responses of 802.16e WiMAX mobile subscriber devices-device identification of better than 96% is achieved with verification EER <= 1.6% for SNR >= -3 dB.
C1 [Reising, Donald R.; Temple, Michael A.] USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Reising, DR (reprint author), USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM Donald.Reising@afit.edu; Michael.Temple@afit.edu
NR 26
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1550-3607
BN 978-1-4577-2053-6
J9 IEEE ICC
PY 2012
PG 6
WC Telecommunications
SC Telecommunications
GA BDD72
UT WOS:000312855701065
ER
PT S
AU Redfield, RC
Sutela, C
AF Redfield, Robin C.
Sutela, Cory
BE Drane, P
Sherwood, J
TI Mountain bike wheel endurance testing and modeling
SO ENGINEERING OF SPORT CONFERENCE 2012
SE Procedia Engineering
LA English
DT Proceedings Paper
CT 9th Conference of the International-Sports-Engineering-Association
(ISEA)
CY JUL 09-13, 2012
CL Univ Massachusetts Lowell, Lowell, MA
SP Int Sports Engn Assoc (ISEA)
HO Univ Massachusetts Lowell
DE Mountain biking; wheels; failure testing
AB Mountain bike wheels may be evaluated for durability and mode of failure using bump drum test machines that subject wheels to simulated rider loads and uneven terrain. These machines may operate at high speeds in order to accelerate failures, particularly during the design and prototype phase of wheel development. This paper describes a mathematical model of the dynamics of a wheel test drum assembly, and the validation of the model using data recorded during a wheel test. This model will subsequently be applied to better understand the key test operating parameters that must be controlled in order to produce repeatable durability data during accelerated testing. (c) 2012 Published by Elsevier Ltd.
C1 [Redfield, Robin C.] US AF Acad, Dept Engn Mech, Colorado Springs, CO 80840 USA.
[Sutela, Cory] Colorado Dev Ctr, Colorado Springs, CO USA.
RP Redfield, RC (reprint author), US AF Acad, Dept Engn Mech, Colorado Springs, CO 80840 USA.
EM rob.redfield@usafa.edu
FU SRAM LLC.; Colorado Development Center
FX y The authors would like to acknowledge the contributions of SRAM LLC,
Colorado Development Center in supporting this work.
NR 4
TC 0
Z9 0
U1 1
U2 5
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1877-7058
J9 PROCEDIA ENGINEER
PY 2012
VL 34
BP 658
EP 663
DI 10.1016/j.proeng.2012.04.112
PG 6
WC Engineering, Multidisciplinary; Sport Sciences
SC Engineering; Sport Sciences
GA BDN55
UT WOS:000314046000112
ER
PT S
AU Browning, JP
Griffiths, HD
Baker, CJ
Wicks, MC
AF Browning, James Paul
Griffiths, Hugh D.
Baker, Chris J.
Wicks, Michael C.
GP IEEE
TI On the Detection of Weak Targets that Exhibit Partial-Coherence
SO 2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT IEEE International Symposium on Antennas and Propagation
CY JUL 08-14, 2012
CL Chicago, IL
SP Inst Electr Electron Engineers, IEEE Antennas & Propaga Soc
AB The detection of small targets against a background of clutter and interference has long been a challenge to the designer of radar systems. Whilst much progress has been made, there is still a strong motivation to improve performance even further. Specifically here, the detection of targets that are both weak and extended where the signal-to-noise ratios (SNR) is negative is considered. This work examines a novel diversity based coherent integration technique where the coherence is partial.
C1 [Browning, James Paul] USAF, Sensors Directorate, Res Lab, Dayton, OH 45433 USA.
RP Browning, JP (reprint author), USAF, Sensors Directorate, Res Lab, Dayton, OH 45433 USA.
EM James.Browning@wpafb.af.mil; h.griffiths@ee.ucl.ac.uk;
baker@ece.osu.edu; Michael.Wicks@udri.udayton.edu
NR 9
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-0462-7
J9 IEEE ANTENNAS PROP
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BDB29
UT WOS:000312442301297
ER
PT S
AU Ehrenberg, IM
Sarma, SE
Wu, BI
AF Ehrenberg, Isaac M.
Sarma, Sanjay E.
Wu, Bae-Ian
GP IEEE
TI Fully Conformal FSS via Rapid 3D Prototyping
SO 2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT IEEE International Symposium on Antennas and Propagation
CY JUL 08-14, 2012
CL Chicago, IL
SP Inst Electr Electron Engineers, IEEE Antennas & Propagat Soc
AB Prototype fabrication of microwave antennae and metamaterials has been dominated by planar manufacturing techniques, complicating experimental validation of designs that utilize more than two dimensions. This paper introduces a methodology that enables the rapid fabrication of electromagnetic prototypes with complex surfaces. As an example, a conformal frequency selective surface is presented in the form of a paraboloid patterned with an array of cross loop features. Experiments confirm the surface exhibits a stop band at 12.5 GHz, achieving a 30dB drop in power transmission.
C1 [Ehrenberg, Isaac M.; Sarma, Sanjay E.] MIT, Dept Mech Engn, Cambridge, MA 02446 USA.
[Wu, Bae-Ian] Air Force Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Ehrenberg, IM (reprint author), MIT, Dept Mech Engn, Cambridge, MA 02446 USA.
NR 6
TC 0
Z9 0
U1 0
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-0462-7
J9 IEEE ANTENNAS PROP
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BDB29
UT WOS:000312442300353
ER
PT S
AU Kent, BM
Ehret, RA
AF Kent, Brian M.
Ehret, Robert A.
GP IEEE
TI Rethinking Intelligence, Surveillance, and Reconnaissance in a Wireless
Connected World
SO 2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT IEEE International Symposium on Antennas and Propagation
CY JUL 08-14, 2012
CL Chicago, IL
SP Inst Electr Electron Engineers, IEEE Antennas & Propaga Soc
AB The Air Force Research Laboratory Sensors Directorate, in Dayton Ohio, has a mission "To lead the discovery, development, and integration of affordable sensor technologies for our warfighters." Within this functional mission, the USAF is witnessing a worldwide revolution in technologies related to Intelligence, Surveillance, and Reconnaissance (ISR) missions. While "commercial off the shelf" wireless components help the USAF rapidly create and field ISR capabilities in months that once took years, the universal availability of cell phone and publically interconnected cameras and sensors are forcing the USAF to rethink traditional ISR paradigms altogether. Our nation's ability to deter international criminal and transnational violence will depend on our ability to produce a Globally Integrated ISR (GI-ISR) capability that rapidly provides decision makers with timely information.
C1 [Kent, Brian M.; Ehret, Robert A.] USAF, Res Lab, AFRL RY, Wright Patterson AFB, OH 45433 USA.
RP Kent, BM (reprint author), USAF, Res Lab, AFRL RY, Bldg 600,2241 Avion Cir, Wright Patterson AFB, OH 45433 USA.
EM Brian.kent@wpafb.af.mil; Robert.ehret@wpafb.af.mil
NR 1
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-0462-7
J9 IEEE ANTENNAS PROP
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BDB29
UT WOS:000312442301333
ER
PT S
AU Kent, BM
Thomas, C
Ryan, P
AF Kent, Brian M.
Thomas, Christopher
Ryan, Patti
GP IEEE
TI The NASA Debris Radar for Characterizing Static and Dynamic Ascent
Debris Events for Safety of Flight
SO 2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT IEEE International Symposium on Antennas and Propagation
CY JUL 08-14, 2012
CL Chicago, IL
SP Inst Electr Electron Engineers, IEEE Antennas & Propaga Soc
AB During the NASA "Columbia" accident investigation, the root cause of the accident was ultimately attributed to liberated foam debris damaging the left wing heat shield during ascent. After the accident, The Space Shuttle Program Systems Engineering and Integration (SE&I) Office tasked a joint AFRL, NASA, and US Navy team to create a day/night radar sensor to characterize the debris threat during the ascent phase of a Space Shuttle launch, and further identify/define the return signals as seen by the radar. Ultimately the team co-developed the "NASA Debris Radar (NDR)," a three-sensor C-and X-Band Doppler and radar imaging system that provided Shuttle mission managers unprecedented all weather insight into Shuttle dynamic debris events. This paper will briefly summarize the development and capabilities of the NDR and highlight exemplars of the processed radar data products, demonstrating how these products provided unprecedented insight into the complex ascent debris environment of the Shuttle. The NDR was successfully employed on every "post-accident" Shuttle mission.
C1 [Kent, Brian M.; Thomas, Christopher; Ryan, Patti] USAF, Res Lab, AFRL RY, Wright Patterson AFB, OH 45433 USA.
RP Kent, BM (reprint author), USAF, Res Lab, AFRL RY, Bldg 600,2241 Avion Cir, Wright Patterson AFB, OH 45433 USA.
EM Brian.Kent@wpafb.af.mil
NR 3
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-0462-7
J9 IEEE ANTENNAS PROP
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BDB29
UT WOS:000312442301078
ER
PT S
AU Kim, KT
AF Kim, Kristopher T.
GP IEEE
TI Validation of the Slepian Approach to Truncation-Error Reduction in
Spherical Near-Field Scanning
SO 2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT IEEE International Symposium on Antennas and Propagation
CY JUL 08-14, 2012
CL Chicago, IL
SP Inst Electr Electron Engineers, IEEE Antennas & Propaga Soc
AB We apply the recently developed Slepian transverse vector spherical harmonics (TVSH) to near-field measurement data and show that the Slepian formalism virtually eliminates angular truncation errors.
C1 USAF, Div Electromagnet Technol, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Kim, KT (reprint author), USAF, Div Electromagnet Technol, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 5
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-0462-7
J9 IEEE ANTENNAS PROP
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BDB29
UT WOS:000312442301259
ER
PT S
AU Nair, NV
Pray, AJ
Villa-Giron, J
Shanker, B
Wilton, DR
AF Nair, N. V.
Pray, A. J.
Villa-Giron, J.
Shanker, B.
Wilton, D. R.
GP IEEE
TI A Singularity Cancellation Technique on Arbitrary Higher Order Patch
Descriptions
SO 2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT IEEE International Symposium on Antennas and Propagation
CY JUL 08-14, 2012
CL Chicago, IL
SP Inst Electr Electron Engineers, IEEE Antennas & Propagat Soc
DE Singularity cancellation; singular quadrature; near singularity;
integral equations
ID NUMERICAL EVALUATION; INTEGRALS
AB Accurate integration of singular and near-singular functions is critical to the accuracy of the method of moments solution to integral equations. While this problem has been widely addressed for flat geometries, their extensions to higher order surface descriptions have been limited. This paper provides a comprehensive prescription for the application of the singularity cancellation schemes to higher order surfaces. We present implementation details and demonstrative results.
C1 [Nair, N. V.; Pray, A. J.; Shanker, B.] Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA.
[Villa-Giron, J.] AFRL, Wright Patterson AFB, OH 45433 USA.
[Shanker, B.] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA.
[Wilton, D. R.] Univ Houston, Dept Elect & Comp Engn, Houston, TX 77204 USA.
RP Nair, NV (reprint author), Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA.
FU National Science Foundation (NSF) [DMS-0811197, CCF- 1018516]; SMART
program office [N00244-091-0081]
FX This work was supported by the National Science Foundation (NSF) through
grant DMS-0811197 and CCF- 1018516, and by the SMART program office
through grant N00244-091-0081.
NR 9
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-0462-7
J9 IEEE ANTENNAS PROP
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BDB29
UT WOS:000312442300367
ER
PT S
AU O'Connor, A
Vela, R
Lo Monte, L
AF O'Connor, Alan
Vela, Russell
Lo Monte, Lorenzo
GP IEEE
TI Target-adaptive Radar Pulse-train Optimization
SO 2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT IEEE International Symposium on Antennas and Propagation
CY JUL 08-14, 2012
CL Chicago, IL
SP Inst Electr Electron Engineers, IEEE Antennas & Propaga Soc
ID TRACKING
AB The possibility of optimizing pulse-train length in pulse-Doppler radar is investigated. Adapting pulse-train length in real-time changes the precision of range and velocity information present in radar returns and influences the eventual tracker performance.
C1 [O'Connor, Alan] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP O'Connor, A (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM Alan.O'Connor.ctr@wpafb.af.mil; Russell.Vela.ctr@wpafb.af.mil;
Lorenzo.Lomonte.ctr@wpafb.af.mil
NR 12
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-0462-7
J9 IEEE ANTENNAS PROP
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BDB29
UT WOS:000312442301298
ER
PT S
AU Scalzi, G
AF Scalzi, Gary
GP IEEE
TI Implications of Current Radar Research on Antennas and Propogation
SO 2012 IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM
(APSURSI)
SE IEEE Antennas and Propagation Society International Symposium
LA English
DT Proceedings Paper
CT IEEE International Symposium on Antennas and Propagation
CY JUL 08-14, 2012
CL Chicago, IL
SP Inst Electr Electron Engineers, IEEE Antennas & Propaga Soc
AB The Air Force Research Laboratory (AFRL), Sensors Directorate is evolving the Outdoor Radar Range (ORR) to provide the research community with state-of-the-art testbed capabilities for the next decades. In this work, a general overview of the ORR will be presented, with particular emphasis on potential research activities of interest for both the antennas/propagation and the radar communities.
C1 USAF, Res Lab, RF Phenomenol Sect RYMDA, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
RP Scalzi, G (reprint author), USAF, Res Lab, RF Phenomenol Sect RYMDA, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM Gary.Scalzi@wpafb.af.mil
NR 3
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1522-3965
BN 978-1-4673-0462-7
J9 IEEE ANTENNAS PROP
PY 2012
PG 2
WC Engineering, Electrical & Electronic; Telecommunications
SC Engineering; Telecommunications
GA BDB29
UT WOS:000312442301301
ER
PT J
AU Stringer, J
Lamont, G
Akers, G
AF Stringer, Jeremy
Lamont, Gary
Akers, Geoffrey
GP IEEE
TI Radar Phase-Coded Waveform Design using MOEAs
SO 2012 IEEE CONGRESS ON EVOLUTIONARY COMPUTATION (CEC)
SE IEEE Congress on Evolutionary Computation
LA English
DT Proceedings Paper
CT IEEE International Conference on Fuzzy Systems (FUZZ-IEEE) /
International Joint Conference on Neural Networks (IJCNN) / IEEE
Congress on Evolutionary Computation (IEEE-CEC) / IEEE World Congress on
Computational Intelligence (IEEE-WCCI)
CY JUN 10-15, 2012
CL Brisbane, AUSTRALIA
SP IEEE
AB This study applies the NSGA-II, SPEA2, and MOEA/D Multi-Objective Evolutionary Algorithms (MOEAs) to the radar phase coded waveform design problem. The MOEAs are used to generate a series of radar waveform phase codes that have excellent range resolution and Doppler resolution capabilities, while maintaining excellent autocorrelation properties. The study compares the ability of NSGA-II, SPEA2, and MOEA/D to generate a Pareto front of phase code solutions, and then improve upon the quality of the solutions while maintaining a sufficient diversity of available radar phase codes. Results demonstrate that for solving moderate to large instances of the radar phase code problem all three MOEAs generate a diverse set of Pareto optimal radar phase codes. The phase codes generated by NSGA-II have overall better autocorrelation properties than those generated by SPEA2 and MOEA/D, however, all three MOEAs produce useable phase codes.
C1 [Stringer, Jeremy; Lamont, Gary; Akers, Geoffrey] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
RP Stringer, J (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
EM jeremy.stringer@afit.edu; gary.lamont@afit.edu; geoffery.akers@afit.edu
NR 11
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-1509-8
J9 IEEE C EVOL COMPUTAT
PY 2012
PG 8
WC Engineering, Electrical & Electronic; Mathematical & Computational
Biology
SC Engineering; Mathematical & Computational Biology
GA BDD74
UT WOS:000312859302116
ER
PT S
AU King, AS
Martin, RK
AF King, Amanda Sue
Martin, Richard K.
GP IEEE
TI THE BENEFITS OF GAME USE IN A SIGNAL PROCESSING GRADUATE CLASS
SO 2012 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL
PROCESSING (ICASSP)
SE International Conference on Acoustics Speech and Signal Processing
ICASSP
LA English
DT Proceedings Paper
CT IEEE International Conference on Acoustics, Speech and Signal Processing
CY MAR 25-30, 2012
CL Kyoto, JAPAN
SP Inst Elect & Elect Engineers, Signal Processing Soc, IEEE
DE games; education; review; graduate; analysis
AB It is important in the age of the INTERNET and video games to keep students engaged in the classroom. One way of doing this is through the use of games and simulations. TABOO(TM) is a card game which involves getting players to say a keyword without saying five forbidden words(1). This can be adapted for any number of different subjects. In this paper the game was adapted for use in "Detection and Estimation" (EENG663) class at the Air Force Institute of Technology (AFIT). A study was conducted to see if there is a difference in the scores of the final examination for two different groups. Data was obtained on the students. Their project, midterm and final exam scores were recorded. Group one took EENG663 without the additional game preparation, group two had the additional review given right before the final exam. A statistical analysis of the scores is presented in this paper. Some students also completed a survey that asked their opinions on using the game in the classroom. Results show that there was a statistically significant difference in the mean final exam scores for the two groups.
C1 [King, Amanda Sue; Martin, Richard K.] USAF, Inst Technol, Dept Elec & Comp Eng, Wright Patterson AFB, OH 45433 USA.
RP King, AS (reprint author), USAF, Inst Technol, Dept Elec & Comp Eng, Wright Patterson AFB, OH 45433 USA.
EM amanda.king@afit.edu; richard.martin@afit.edu
NR 16
TC 2
Z9 2
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1520-6149
BN 978-1-4673-0046-9
J9 INT CONF ACOUST SPEE
PY 2012
BP 2753
EP 2756
PG 4
WC Acoustics; Engineering, Electrical & Electronic
SC Acoustics; Engineering
GA BDA84
UT WOS:000312381402209
ER
PT S
AU Wenndt, SJ
Mitchell, RL
AF Wenndt, Stanley J.
Mitchell, Ronald L.
GP IEEE
TI FAMILIAR SPEAKER RECOGNITION
SO 2012 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL
PROCESSING (ICASSP)
SE International Conference on Acoustics Speech and Signal Processing
ICASSP
LA English
DT Proceedings Paper
CT IEEE International Conference on Acoustics, Speech and Signal Processing
CY MAR 25-30, 2012
CL Kyoto, JAPAN
SP Inst Elect & Elect Engineers, Signal Processing Soc, IEEE
DE Speaker Familiarity; Voice Recognitions by Humans
ID IDENTIFICATION
AB Speaker recognition by machines can be quite good for large groups as seen in NIST speaker recognition evaluations. However, speaker recognition by machine can be fragile for changing environments. This research examines how robust humans are for recognizing familiar speakers in changing environments. Additionally, bandlimited noise was used to try to learn what frequency regions are important for human listeners to recognize familiar speakers.
C1 [Wenndt, Stanley J.] USAF, Res Lab, Rome, NY 13440 USA.
RP Wenndt, SJ (reprint author), USAF, Res Lab, Rome, NY 13440 USA.
EM Stanley.Wenndt@rl.af.mil; mitcherl@clarkson.edu
NR 8
TC 1
Z9 1
U1 1
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1520-6149
BN 978-1-4673-0046-9
J9 INT CONF ACOUST SPEE
PY 2012
BP 4237
EP 4240
PG 4
WC Acoustics; Engineering, Electrical & Electronic
SC Acoustics; Engineering
GA BDA84
UT WOS:000312381404077
ER
PT S
AU Wenndt, SJ
Mitchell, RL
AF Wenndt, Stanley J.
Mitchell, Ronald L.
GP IEEE
TI MACHINE RECOGNITION VS HUMAN RECOGNITION OF VOICES
SO 2012 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL
PROCESSING (ICASSP)
SE International Conference on Acoustics Speech and Signal Processing
ICASSP
LA English
DT Proceedings Paper
CT IEEE International Conference on Acoustics, Speech and Signal Processing
CY MAR 25-30, 2012
CL Kyoto, JAPAN
SP Inst Elect & Elect Engineers, Signal Processing Soc, IEEE
DE Speaker Familiarity; Human Voice Recognition; Robust Speaker
Identification
ID PARAMETERS; PATTERNS
AB While automated speaker recognition by machines can be quite good as seen in NIST Speaker Recognition Evaluations, performance can still suffer when the environmental conditions, emotions, or recording quality changes. This research examines how robust humans are compared to machine recognition for changing environments. Several data conditions including short sentences, frequency selective noise, and time-reversed speech are used to test the robustness of both humans and machine algorithms. Statistical significance tests were completed and, for most conditions, human were more robust.
C1 [Wenndt, Stanley J.] USAF, Res Lab, Rome, NY 13440 USA.
RP Wenndt, SJ (reprint author), USAF, Res Lab, Rome, NY 13440 USA.
EM Stanley.Wenndt@rl.af.mil; mitcherl@clarkson.edu
NR 9
TC 2
Z9 2
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1520-6149
BN 978-1-4673-0046-9
J9 INT CONF ACOUST SPEE
PY 2012
BP 4245
EP 4248
PG 4
WC Acoustics; Engineering, Electrical & Electronic
SC Acoustics; Engineering
GA BDA84
UT WOS:000312381404079
ER
PT S
AU Danner, BL
Coutu, RA
AF Danner, Brent L.
Coutu, Ronald A., Jr.
BE Walczak, R
Dziuban, J
TI Characterizing Metal-Insulator-Transition (MIT) Phase Change Materials
(PCM) for RF and DC Micro-switching Elements
SO 26TH EUROPEAN CONFERENCE ON SOLID-STATE TRANSDUCERS, EUROSENSOR 2012
SE Procedia Engineering
LA English
DT Proceedings Paper
CT 26th European Conference on Solid-State Transducers (Eurosensors)
CY SEP 09-12, 2012
CL Krakow, POLAND
DE Metal Insulator Transition Materials (MIT); Phase Change Materials
(PCM); Germanium Telluride (GeTe); Vanadium Oxide (VOx)
AB Metal-insulator transition (MIT) phase-change materials (PCM) are material compounds that have the ability to be either conductors or insulators depending on external stimuli. A micromachined test structure for applying external electric fields across MIT wire segments was designed and fabricated. Using this novel test structure, Germanium Telluride (GeTe) and Vanadium Oxide (VOx) were successfully transitioned from a conductor to an insulator. The resistivity of the GeTe wire segments increased three to five orders of magnitude with similar to 40V applied to the parallel plates of the test structure. The VOx wires exhibited an order of magnitude transition in resistivity with similar to 20V applied. Characterization of both RF and DC switching performance of these MIT wire segments was completed and GeTe and VOx appear to be viable materials for micro-switching. (C) 2012 Elsevier Ltd....Selection and/or peer-review under responsibility of the Symposium Cracoviense Sp. z.o.o.
C1 [Danner, Brent L.; Coutu, Ronald A., Jr.] USAF, Inst Technol AFIT, Wright Patterson AFB, OH 45433 USA.
RP Coutu, RA (reprint author), USAF, Inst Technol AFIT, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM Ronald.coutu@afit.edu
NR 3
TC 0
Z9 0
U1 2
U2 10
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1877-7058
J9 PROCEDIA ENGINEER
PY 2012
VL 47
BP 80
EP 83
DI 10.1016/j.proeng.2012.09.089
PG 4
WC Engineering, Electrical & Electronic; Instruments & Instrumentation;
Physics, Applied
SC Engineering; Instruments & Instrumentation; Physics
GA BDE57
UT WOS:000312953300021
ER
PT S
AU Glauvitz, N
Blazevic, S
Coutu, R
Kistler, M
Medvedev, IR
Petkie, D
AF Glauvitz, N.
Blazevic, S.
Coutu, R., Jr.
Kistler, M.
Medvedev, I. R.
Petkie, D.
BE Walczak, R
Dziuban, J
TI A MEMS photoacoustic detector of terahertz radiation for chemical
sensing
SO 26TH EUROPEAN CONFERENCE ON SOLID-STATE TRANSDUCERS, EUROSENSOR 2012
SE Procedia Engineering
LA English
DT Proceedings Paper
CT 26th European Conference on Solid-State Transducers (Eurosensors)
CY SEP 09-12, 2012
CL Wroclaw Univ Technol, Fac Microsystem Elect & Photon, Krakow, POLAND
HO Wroclaw Univ Technol, Fac Microsystem Elect & Photon
DE MEMS; Cantilever; Piezoelectric; Photoacoustic; Terahertz Sensor
ID GAS-ANALYSIS
AB A piezoelectric Microelectromechanical system (MEMS) cantilever pressure sensor was designed, modeled, fabricated, and tested for sensing the photoacoustic response of gases to terahertz (THz) radiation. The sensing layers were comprised of three thin films; a lead zirconate titanate (PZT) piezoelectric layer sandwiched between two metal contact layers. The sensor materials were deposited on the silicon device layer of a silicon-on-insulator (SOI) wafer, which formed the physical structure of the cantilever. To release the cantilever, a hole was etched through the backside of the wafer and the buried oxide was removed with hydrofluoric acid. Devices were then tested in a custom made THz vacuum test chamber. Cantilever deflection was observed with a laser interferometer in the test chamber and preliminary data indicates the signals were caused by the photoacoustic effect. Future device data will also include the piezoelectric voltage signal analysis. (C) 2012 Elsevier Ltd....Selection and/or peer-review under responsibility of the Symposium Cracoviense Sp. z.o.o.
C1 [Glauvitz, N.; Blazevic, S.; Coutu, R., Jr.] USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Kistler, M.; Medvedev, I. R.; Petkie, D.] Wright State Univ, Dayton, OH 45435 USA.
RP Coutu, R (reprint author), USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM Ronald.Coutu@AFIT.edu
RI Medvedev, Ivan/E-8486-2014
NR 3
TC 2
Z9 2
U1 0
U2 7
PU ELSEVIER SCIENCE BV
PI AMSTERDAM
PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
SN 1877-7058
J9 PROCEDIA ENGINEER
PY 2012
VL 47
BP 730
EP 733
DI 10.1016/j.proeng.2012.09.251
PG 4
WC Engineering, Electrical & Electronic; Instruments & Instrumentation;
Physics, Applied
SC Engineering; Instruments & Instrumentation; Physics
GA BDE57
UT WOS:000312953300182
ER
PT J
AU Rehg, MT
Gundlach, MJ
Grigorian, RA
AF Rehg, Michael T.
Gundlach, Michael J.
Grigorian, Reza A.
TI Examining the influence of cross-cultural training on cultural
intelligence and specific self-efficacy
SO CROSS CULTURAL MANAGEMENT-AN INTERNATIONAL JOURNAL
LA English
DT Article
DE Intelligence; Training; Lectures; Cultural intelligence; Cross-cultural
training; Self-efficacy
ID COGNITIVE-ABILITY; PERSONALITY; ADJUSTMENT; PERFORMANCE; EXPERIENCE;
SUCCESS; MODEL
AB Purpose - The purpose of this paper is to examine the relationship between cultural intelligence (CQ) and specific self-efficacy (SSE), and the effect of training on CQ and SSE.
Design/methodology/approach - Pre and post-test surveys were administered to 110 US government contracting trainees, in four separate training settings, to measure the effects of training on mean CQ and SSE scores. Two administrations included pre and post-test surveys. One was designed as a post-test only, while the fourth was taken from 25 contracting officers in a recurring training setting. Statistical analyses were performed through the use of t-tests to measure the significance of the change in means across training classes.
Findings - It was found that training using a lecture format significantly improved mean levels of CQ on the cognitive and behavioral dimensions, while less significantly improving motivational CQ. SSE scores from pre- to post-training were also only marginally improved. An additional finding showed significant positive correlations between CQ and SSE, but only in post- training samples.
Practical implications - These findings indicate that managers can use cultural training as an effective tool to increase the cognitive and behavioral dimensions of their employees' CQ, helping employees to be more effective in overseas assignments. In addition, improving employees' SSE on a task to be performed in a cross-cultural situation may help to improve levels of CQ, and thus 'cross-cultural performance.
Originality/value - The paper demonstrates the link between SSE and CQ, and shows that CQ and SSE can be improved through training. The relationship among these variables had not been empirically tested in past research, especially involving samples of public sector employees.
C1 [Rehg, Michael T.; Gundlach, Michael J.] Calif State Univ Chico, Dept Management, Coll Business, Chico, CA 95929 USA.
[Grigorian, Reza A.] USAF, AFMC, Wright Patterson AFB, OH 45433 USA.
RP Rehg, MT (reprint author), Calif State Univ Chico, Dept Management, Coll Business, Chico, CA 95929 USA.
EM mrehg@csuchico.edu
NR 48
TC 15
Z9 15
U1 2
U2 37
PU EMERALD GROUP PUBLISHING LIMITED
PI BINGLEY
PA HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND
SN 1352-7606
J9 CROSS CULT MANAG
JI Cross Cult. Manag.
PY 2012
VL 19
IS 2
BP 215
EP 232
DI 10.1108/13527601211219892
PG 18
WC Management
SC Business & Economics
GA 067OP
UT WOS:000313305300005
ER
PT S
AU Cleary, JW
Snure, M
Leedy, KD
Look, DC
Eyink, K
Tiwari, A
AF Cleary, Justin W.
Snure, Michael
Leedy, Kevin D.
Look, David C.
Eyink, Kurt
Tiwari, Ashutosh
BE Zamboni, R
Kajzar, F
Szep, AA
TI Mid- to long-wavelength infrared surface plasmon properties in doped
zinc oxides
SO OPTICAL MATERIALS AND BIOMATERIALS IN SECURITY AND DEFENCE SYSTEMS
TECHNOLOGY IX
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Optical Materials and Biomaterials in Security and Defence
Systems Technology IX
CY SEP 26-27, 2012
CL Edinburgh, SCOTLAND
SP SPIE, SELEX GALILEO, THALES
DE plasmonics; infrared; sensors; waveguides; zinc oxides
ID RESONANCE BIOSENSORS; SILICON; SILICIDES
AB This work investigates properties of surface plasmons on doped metal oxides in the 2-20 mu m wavelength regime. By varying the stoichiometry in pulse laser deposited Ga and Al doped ZnO, the plasmonic properties can be controlled via a fluctuating free carrier concentration. This deterministic approach may enable one to develop the most appropriate stoichometry of ZnAlO and ZnGaO in regards to specific plasmonic applications for particular IR wavelengths. Presented are theoretical and experimental investigations pertaining to ZnAlO and ZnGaO as surface plasmon host materials. Samples are fabricated via pulsed laser deposition and characterized by infrared ellipsometry and Hall-effect measurements. Complex permittivity spectra are presented, as well as plasmon properties such as the field propagation lengths and penetration depths, in the infrared range of interest. Drude considerations are utilized to determine how the optical properties may change with doping. Finite element simulations verify these plasmonic properties. These materials not only offer potential use as IR plasmon hosts for sensor applications, but also offer new integrated device possibilities due to stoichiometric control of electrical and optical properties.
C1 [Cleary, Justin W.; Snure, Michael; Leedy, Kevin D.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Look, David C.] Wyle Labs Inc, Dayton, OH 45431 USA.
[Look, David C.] Wright State Univ, Semicond Res Ctr, Dayton, OH 45435 USA.
[Eyink, Kurt] Air Force Res Lab, Mat Directorate, Wright Patterson AFB, OH 45433 USA.
[Tiwari, Ashutosh] Univ Utah, Dept Mat Sci & Engn, Salt Lake City, UT 84112 USA.
RP Cleary, JW (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
FU Air Force Office of Scientific Research (Program Manager Dr. Gernot
Pomrenke) [12RY10COR]; Air Force Office of Scientific Research (Program
Manager Dr. James Hwang) [FA9550-10-1-0079]
FX JWC would like to acknowledge support from the Air Force Office of
Scientific Research (Program Manager Dr. Gernot Pomrenke) under contract
number 12RY10COR. DCL would like acknowledge support also from Air Force
Office of Scientific Research (Program Manager Dr. James Hwang) under
grant number FA9550-10-1-0079. We also acknowledge Tim A. Cooper for
Hall-effect measurements.
NR 28
TC 6
Z9 6
U1 2
U2 17
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9286-9
J9 PROC SPIE
PY 2012
VL 8545
AR 854504
DI 10.1117/12.974619
PG 10
WC Materials Science, Biomaterials; Remote Sensing; Optics
SC Materials Science; Remote Sensing; Optics
GA BDH75
UT WOS:000313294400002
ER
PT S
AU McConnell, SN
Seal, MD
Nauyoks, SE
Murphy, NR
Sun, LR
Marciniak, MA
AF McConnell, Shane N.
Seal, Michael D.
Nauyoks, Stephen E.
Murphy, Neil R.
Sun, Lirong
Marciniak, Michael A.
BE Stockman, MI
TI Spectral coherent emission of thermal radiation in the far-field from a
truncated resonator
SO PLASMONICS: METALLIC NANOSTRUCTURES AND THEIR OPTICAL PROPERTIES X
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Plasmonics - Metallic Nanostructures and Their Optical
Properties X
CY AUG 12-16, 2012
CL San Diego, CA
SP SPIE
DE Coherent thermal radiation; infrared; plasmonics; selective emitter;
multilayer
ID PHOTONIC CRYSTALS; ABSORPTION; FILMS; THIN
AB The spectral radiative properties of coherent thermal emission in the mid-and far-IR from two metal-semiconductor resonating structures were demonstrated experimentally. Using an efficient implementation of Rigorous Coupled-Wave Analysis, a truncated resonator was designed to selectively emit at mid-IR and far-IR wavelengths. A High Impulse Power Magnetron Sputtering deposition technique was used to fabricate two Ag-Ge-Ag resonating structures with layer thicknesses of 6-240-160 nm for one sample and 6-700-200 nm for the other. Reflectance measurements demonstrated spectrally selective absorption at the designed mid- and far-IR wavelengths whose general behavior was largely unaffected by a wide range of incident angles. Further, radiance measurements were taken at various high temperatures, up to 601 K, where spectrally selective emission was achieved through wave interference effects due to thermally excited surface waves. From these radiance measurements, spectral emittance was directly derived and compared to the emittance inferred from reflectance measurements. It was established that inferring emittance through Kirchhoff's law can help to approximate the expected emission from a structure, but it is not an exact method of determining the actual emittance of a thermal source at higher temperatures due to the temperature dependence of material parameters.
C1 [McConnell, Shane N.; Seal, Michael D.; Nauyoks, Stephen E.; Marciniak, Michael A.] USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Murphy, Neil R.; Sun, Lirong] Mat & Mfg Directorate, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP McConnell, SN (reprint author), USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM mcconnell.sn@gmail.com
OI Marciniak, Michael/0000-0003-2879-5565
NR 53
TC 0
Z9 0
U1 2
U2 7
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9174-9
J9 PROC SPIE
PY 2012
VL 8457
AR 845736
DI 10.1117/12.930397
PG 15
WC Nanoscience & Nanotechnology; Optics; Physics, Fluids & Plasmas
SC Science & Technology - Other Topics; Optics; Physics
GA BDH14
UT WOS:000313216000038
ER
PT S
AU Sellers, SR
Vap, JC
Nauyoks, SE
Marciniak, MA
Ku, ZY
AF Sellers, Spencer R.
Vap, Jason C.
Nauyoks, Stephen E.
Marciniak, Michael A.
Ku, Zahyun
BE Stockman, MI
TI Investigation of surface plasmonic extraordinary transmission for
spectral, polarimetric and off-normal incidence
SO PLASMONICS: METALLIC NANOSTRUCTURES AND THEIR OPTICAL PROPERTIES X
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Plasmonics - Metallic Nanostructures and Their Optical
Properties X
CY AUG 12-16, 2012
CL San Diego, CA
SP SPIE
DE surface plasmonic structure; extraordinary transmission; Mueller matrix
AB Extraordinary transmission of surface plasmonic (SP) structures has been widely studied but lacking is a focus on the off-normal dependency of the resonant modes and how this affects the transmission spectrum. The measurements of off-normal spectral transmission for a SP structure were compared to finite-difference time-domain simulations. The SP sample is a gold/titanium thin film (50 nm) with a 2D square array of circular holes deposited on 1 mu m of highly ndoped, n=2e18cm(-3), gallium-arsenide (GaAs) upon a semi-insulating GaAs substrate. Spectral transmission measurements were taken for wavelengths from 2-12 mu m, incident elevation and azimuthal angles of theta=0 degrees, 20 degrees and 40 degrees, and phi=0 degrees and 45 degrees, respectively, with linearly polarized and un-polarized light. The first and second-order surface plasmon modes and their dependency on., f, polarization and the grating momentum vector were identified. The measurements and simulations corroborate the theoretical analysis, giving a closed-form solution to the spectral location of lower-order modes. For off-normal incidence in a plane parallel to the array periodicity (phi=0 degrees), the (1,0) mode as defined for p-polarization splits while the (0,1) mode as defined for s-polarization, remains essentially unchanged for all.. For phi=45 degrees incidence, both polarizations split the modes. Full polarimetric spectral transmission was both measured and simulated, giving a Mueller matrix representation of the spectral transmission of the SP structure at phi=0 degrees and 20 degrees and phi=0 degrees and 45 degrees, demonstrating that this structure is moderately depolarizing when resonant. The results show the dependence on incident angle and polarization of the extraordinary transmission of SP structures.
C1 [Sellers, Spencer R.; Vap, Jason C.] USAF, Inst Technol, Dept Elect & Comp Engn, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Nauyoks, Stephen E.; Marciniak, Michael A.] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
[Ku, Zahyun] US Air Force, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Sellers, SR (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
OI Marciniak, Michael/0000-0003-2879-5565
NR 10
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9174-9
J9 PROC SPIE
PY 2012
VL 8457
AR 84573K
DI 10.1117/12.929696
PG 14
WC Nanoscience & Nanotechnology; Optics; Physics, Fluids & Plasmas
SC Science & Technology - Other Topics; Optics; Physics
GA BDH14
UT WOS:000313216000042
ER
PT S
AU Bartsch, CM
Lombardi, JP
Aga, RS
Lorenzini, RG
Kline, WM
Sotzing, G
Heckman, EM
Subramanyam, G
AF Bartsch, Carrie M.
Lombardi, Jack P., III
Aga, Roberto S., Jr.
Lorenzini, Robert G.
Kline, Whitney M.
Sotzing, Gregory
Heckman, Emily M.
Subramanyam, Guru
BE Garimella, A
Purdy, CC
TI Response of Varactors Containing DNA-Conjugated Polymer
SO 2012 IEEE 55TH INTERNATIONAL MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS
(MWSCAS)
SE Midwest Symposium on Circuits and Systems Conference Proceedings
LA English
DT Proceedings Paper
CT 55th IEEE International Midwest Symposium on Circuits and Systems
(MWSCAS)
CY AUG 05-08, 2012
CL Boise, ID
SP IEEE, Boise State Univ, IEEE Circuits & Syst Soc (CAS)
ID MICROWAVE DIELECTRIC-PROPERTIES
AB We study the effect on the microwave S-parameters of adding a conjugated polymer layer to a deoxyribonucleic acid-based (DNA-based) biopolymer within a variable capacitor (varactor) using a capacitive test structure. The conjugated polymer we are using in this work is poly(3-hexylthiophene-2,5-diyl) (P3HT) and the DNA-based biopolymer is DNA-CTMA. The results are compared to both the baseline DNA-based biopolymer and the conjugated polymer layer added to a layer of polyvinyl alcohol. The addition of the conjugated polymer layer underneath the DNA-based biopolymer is found to most significantly improve the stability and dielectric tuning of the DNA-based biopolymer.
C1 [Bartsch, Carrie M.; Lombardi, Jack P., III; Aga, Roberto S., Jr.; Sotzing, Gregory; Heckman, Emily M.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Aga, Roberto S., Jr.] Gen Dynam Informat Technol, Dayton, OH 45431 USA.
[Kline, Whitney M.; Sotzing, Gregory] Univ Connecticut, Dept Chem & Polymer Program, Storrs, CT 06269 USA.
[Subramanyam, Guru] Univ Dayton, Dept Elect & Comp Engn, Dayton, OH 45469 USA.
RP Bartsch, CM (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
OI Lorenzini, Robert/0000-0001-9429-1379
NR 9
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1548-3746
BN 978-1-4673-2527-1
J9 MIDWEST SYMP CIRCUIT
PY 2012
BP 142
EP 145
PG 4
WC Computer Science, Information Systems; Engineering, Electrical &
Electronic
SC Computer Science; Engineering
GA BDC73
UT WOS:000312667200036
ER
PT S
AU Gallo, EM
Willner, BI
Hwang, J
Sun, S
Spencer, M
Salagaj, T
Mitchel, WC
Sbrockey, N
Tompa, GS
AF Gallo, Eric M.
Willner, Bruce I.
Hwang, Jeonghyun
Sun, Shangzhu
Spencer, Michael
Salagaj, Tom
Mitchel, William C.
Sbrockey, Nick
Tompa, Gary S.
BE Pribat, D
Lee, YH
Razeghi, M
TI Chemical Vapor Deposition of Graphene on Copper at Reduced Temperatures
SO CARBON NANOTUBES, GRAPHENE, AND ASSOCIATED DEVICES V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Carbon Nanotubes, Graphene, and Associated Devices V
CY AUG 14-15, 2012
CL San Diego, CA
SP SPIE
DE Graphene; Chemical vapor deposition; low temperature growth
ID DEVICES; FILMS
AB A preliminary study on reduced temperature chemical vapor deposition of graphene on copper substrates was performed. Graphene's exceptional mechanical strength, very high electrical and thermal conductivity, and stability at atomic layer thicknesses, generates potential for a broad range of applications, from nanodevices to transparent conductor to chemical sensor. Of the techniques demonstrated for graphene formation, chemical vapor deposition is the sole process suitable for manufacturing large area films. While large area film deposition of graphene has been shown on metal substrates, this process has been limited to high temperatures, 900-1000C, which increases the cost of production and limits methods of integrating the graphene with other material structures. In this work, CVD of graphene on copper foil was attempted over a range of temperatures (650 - 950C) on substrates as large as 5 x 15 cm in a horizontal tube reactor. Depositions were performed using both CVD and upstream Plasma-Enhanced CVD (PECVD), and the results are compared for both techniques. Quality of graphene films deposited with and without plasma enhancement was characterized by micro Raman spectroscopy.
C1 [Gallo, Eric M.; Willner, Bruce I.; Sun, Shangzhu; Salagaj, Tom; Sbrockey, Nick; Tompa, Gary S.] Struct Mat Ind, Piscataway, NJ 08854 USA.
[Hwang, Jeonghyun; Spencer, Michael] Cornell Univ, Ithaca, NY USA.
[Mitchel, William C.] Air Force Res Lab, Wright Patterson AFB, OH USA.
RP Tompa, GS (reprint author), Struct Mat Ind, Piscataway, NJ 08854 USA.
EM GSTompa@aol.com
FU Air Force Phase II STTR [FA9550-10-C-0168]; NSF/ASEE SBIR Post-Doctral
Fellowship
FX This work was supported under an Air Force Phase II STTR
(FA9550-10-C-0168); F.G was supported by an NSF/ASEE SBIR Post-Doctral
Fellowship.
NR 7
TC 0
Z9 0
U1 2
U2 32
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9179-4
J9 PROC SPIE
PY 2012
VL 8462
AR 846203
DI 10.1117/12.929094
PG 7
WC Nanoscience & Nanotechnology; Optics
SC Science & Technology - Other Topics; Optics
GA BDG13
UT WOS:000313077800001
ER
PT S
AU Mou, S
Kim, SS
Chen, KH
Chen, LC
Naik, RR
Brown, GJ
Mitchel, WC
AF Mou, Shin
Kim, Steve S.
Chen, Kuei-Hsien
Chen, Li-Chyong
Naik, Rajesh R.
Brown, Gail J.
Mitchel, W. C.
BE Pribat, D
Lee, YH
Razeghi, M
TI Infrared Transmission Spectroscopy of CVD graphene on Si
SO CARBON NANOTUBES, GRAPHENE, AND ASSOCIATED DEVICES V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Carbon Nanotubes, Graphene, and Associated Devices V
CY AUG 14-15, 2012
CL San Diego, CA
SP SPIE
DE Graphene; Infrared; CVD; Transmission; FTIR
AB We report transmission spectroscopy results from the mid- to far-infrared on graphene, grown by chemical vapor deposition (CVD) on Cu. Similar results have been reported by several groups and their substrates of choice were thermal Si dioxide, quartz, or SiC, where strong phonon absorption results in transmission blocking bands in mid-infrared. Silicon wafers (thickness similar to 500 mu m), on the other hand, have transmission extending out to about 100 cm(-1) when the doping level is low. Therefore, we choose to use Si wafers as the carrier substrates for transferred CVD graphene. The complex refractive index of the Si substrate is measured by infrared spectroscopic ellipsometry. As a result, continuous spectra (without blocking bands) in the range of 400 to 4000 cm(-1) are obtained and they are modeled by free carrier absorption (the Drude model) and interband transitions (considering the Pauli blocking.) From these, the carrier density, carrier mobility, sheet resistivity, intraband scattering rate, and graphene layer number can be inferred. In the far-infrared range, the absorption is dominated by the intraband free carrier absorption and it mainly results from the interband transition in the mid-infrared range. Having continuous spectra using the Si substrates gives us the advantage to model the whole spectral region (from far-infrared to mid-infrared) accurately.
C1 [Mou, Shin; Kim, Steve S.; Naik, Rajesh R.; Brown, Gail J.; Mitchel, W. C.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Chen, Kuei-Hsien] Acad Sinica, Inst Atom & Mol Sci, Taipei, Taiwan.
[Chen, Li-Chyong] Natl Taiwan Univ, Ctr Condensed Matter Sci, Taipei, Taiwan.
RP Mou, S (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
FU Air Force Research Laboratory (USA); Asian Office of Aerospace Research
and Development under AFOSR; Ministry of Education, National Science
Council, Academia Sinica (Taiwan)
FX The authors acknowledge support from Air Force Research Laboratory (USA)
and Asian Office of Aerospace Research and Development under AFOSR.
K.-H. Chen and L.- C. Chen also acknowledge the support from the
Ministry of Education, National Science Council, Academia Sinica
(Taiwan). S. M. acknowledges the assistance on the Raman spectroscopy
from Shanee Pacley (Air Force Research Laboratory) and the assistance on
the spectroscopic ellipsometry from Kurt Eyink (Air Force Research
Laboratory.)
NR 9
TC 3
Z9 3
U1 3
U2 28
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9179-4
J9 PROC SPIE
PY 2012
VL 8462
AR 84620H
DI 10.1117/12.930246
PG 6
WC Nanoscience & Nanotechnology; Optics
SC Science & Technology - Other Topics; Optics
GA BDG13
UT WOS:000313077800010
ER
PT S
AU Pacley, S
Mitchel, W
Murray, PT
Anderson, D
Smith, HE
Beck-Millerton, E
Voevodin, AA
AF Pacley, S.
Mitchel, W.
Murray, P. T.
Anderson, D.
Smith, H. E.
Beck-Millerton, E.
Voevodin, A. A.
BE Pribat, D
Lee, YH
Razeghi, M
TI Investigation of the behavior of the Ni catalyst in chemical vapor
deposition synthesis of carbon nanopearls
SO CARBON NANOTUBES, GRAPHENE, AND ASSOCIATED DEVICES V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Carbon Nanotubes, Graphene, and Associated Devices V
CY AUG 14-15, 2012
CL San Diego, CA
SP SPIE
DE Carbon nanopearls; nickel; catalyst; chemical vapor deposition
ID NANOSPHERES; SPHERES; NANOPARTICLES; GROWTH
AB The role of the nickel catalyst size and its chemical and structural evolution during the early stages of carbon nanopearl nucleation and growth, by chemical vapor deposition from acetylene/argon mixture, was investigated and correlated with the resulting nanopearls morphological and structural properties. Carbon nanopearls were grown using Ni nanoparticles that were 20 nm and 100 nm in size, at a growth temperature of 850 degrees C, for the following growth times: 10 sec, 30 sec, 60 sec, 90 sec, 120 sec and 300 sec. X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopy were performed on the carbon nanopearl samples. The X-ray diffraction and X-ray photoelectron spectra showed the following chemical constituents were present during the growth of carbon nanopearls: NiO, Ni2O3, Ni3C, Ni, CO and C (both amorphous and graphite). Transmission electron microscopy showed an increase in carbon nanopearl size with larger Ni nanoparticles Finally, the results showed that the 20 nm Ni nanoparticles chemically reacted sooner than the 100 nm Ni nanoparticles.
C1 [Pacley, S.; Mitchel, W.; Beck-Millerton, E.; Voevodin, A. A.] USAF, Res Lab, Wright Patterson AFB, Wright Patterson AFB, OH 45433 USA.
[Murray, P. T.; Anderson, D.; Smith, H. E.] Univ Dayton, Inst Res, Dayton, OH USA.
RP Pacley, S (reprint author), USAF, Res Lab, Wright Patterson AFB, Wright Patterson AFB, OH 45433 USA.
RI Voevodin, Andrey/I-6684-2013
FU Materials and Manufacturing Directorate for the Air Force Research
Laboratory
FX This research was supported by the Materials and Manufacturing
Directorate for the Air Force Research Laboratory.
NR 16
TC 0
Z9 0
U1 1
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9179-4
J9 PROC SPIE
PY 2012
VL 8462
AR 846205
DI 10.1117/12.929766
PG 16
WC Nanoscience & Nanotechnology; Optics
SC Science & Technology - Other Topics; Optics
GA BDG13
UT WOS:000313077800003
ER
PT S
AU Grote, JG
Gorman, T
Ouchen, F
AF Grote, James G.
Gorman, Timothy
Ouchen, Fahima
BE Kobayashi, N
Ouchen, F
Rau, I
TI Solid state lighting using deoxyribonucleic acid-phosphor blend
SO NANOBIOSYSTEMS: PROCESSING, CHARACTERIZATION, AND APPLICATIONS V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanobiosystems - Processing, Characterization, and
Applications V
CY AUG 12-15, 2012
CL San Diego, CA
SP SPIE
AB Commercial white solid state lighting consists of a blue light emitting diodes (LEDs) that excites a yellow-emitting phosphor powder, which is encapsulated with epoxy on top of the LED die. In this paper, we present the results of replacing the epoxy, with a promising new material, a deoxyribonucleic acid (DNA)-based biopolymer. Using this DNA-biopolymer as the host, has shown the potential for improving both the brightness and color of the light output.
C1 [Grote, James G.; Gorman, Timothy; Ouchen, Fahima] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Grote, JG (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 16
TC 2
Z9 2
U1 1
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9181-7
J9 PROC SPIE
PY 2012
VL 8464
AR 846402
DI 10.1117/12.944224
PG 8
WC Nanoscience & Nanotechnology; Materials Science, Characterization &
Testing; Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BDG17
UT WOS:000313079800001
ER
PT S
AU Heckman, EM
Aga, RS
Cory, EMF
Ouchen, F
Lesko, A
Telek, B
Lombardi, J
Bartsch, CM
Grote, JG
AF Heckman, Emily M.
Aga, Roberto S.
Cory, Emily M. Fehrman
Ouchen, Fahima
Lesko, Alyssa
Telek, Brian
Lombardi, Jack
Bartsch, Carrie M.
Grote, James G.
BE Kobayashi, N
Ouchen, F
Rau, I
TI Advances in DNA Photonics
SO NANOBIOSYSTEMS: PROCESSING, CHARACTERIZATION, AND APPLICATIONS V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanobiosystems - Processing, Characterization, and
Applications V
CY AUG 12-15, 2012
CL San Diego, CA
SP SPIE
DE DNA; Electro-optic modulator; waveguide; poled polymers; biopolymer
ID NANOIMPRINT LITHOGRAPHY; POLYMERS; MODULATORS; DEVICES; FILMS
AB In this paper we present our current research in exploring a DNA biopolymer for photonics applications. A new processing technique has been adopted that employs a modified soxhlet-dialysis (SD) rinsing technique to completely remove excess ionic contaminants from the DNA biopolymer, resulting in a material with greater mechanical stability and enhanced performance reproducibility. This newly processed material has been shown to be an excellent material for cladding layers in poled polymer electro-optic (EO) waveguide modulator applications. Thin film poling results are reported for materials using the DNA biopolymer as a cladding layer, as are results for beam steering devices also using the DNA biopolymer. Finally, progress on fabrication of a Mach Zehnder EO modulator with DNA biopolymer claddings using nanoimprint lithography techniques is reported.
C1 [Heckman, Emily M.; Lombardi, Jack; Bartsch, Carrie M.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Aga, Roberto S.] General Dynam Informat Technol, Dayton, OH 45433 USA.
[Cory, Emily M. Fehrman] CUnivers Dayton, Elect Optic Dept, Dayton, OH 45469 USA.
[Ouchen, Fahima] Univ Dayton Res Lab, Dayton, OH 45469 USA.
[Telek, Brian] EUnivers Dayton, Dept Biochem, Dayton, OH 45469 USA.
[Grote, James G.] FAir Force Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
RP Heckman, EM (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
NR 27
TC 2
Z9 2
U1 1
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9181-7
J9 PROC SPIE
PY 2012
VL 8464
AR 84640P
DI 10.1117/12.930873
PG 7
WC Nanoscience & Nanotechnology; Materials Science, Characterization &
Testing; Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BDG17
UT WOS:000313079800013
ER
PT S
AU Johnson, LE
Latimer, LN
Benight, SJ
Watanabe, ZH
Elder, DL
Robinson, BH
Bartsch, CM
Heckman, EM
Depotter, G
Clays, K
AF Johnson, Lewis E.
Latimer, Luke N.
Benight, Stephanie J.
Watanabe, Zachary H.
Elder, Delwin L.
Robinson, Bruce H.
Bartsch, Carrie M.
Heckman, Emily M.
Depotter, Griet
Clays, Koen
BE Kobayashi, N
Ouchen, F
Rau, I
TI Novel cationic dye and crosslinkable surfactant for DNA biophotonics
SO NANOBIOSYSTEMS: PROCESSING, CHARACTERIZATION, AND APPLICATIONS V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanobiosystems - Processing, Characterization, and
Applications V
CY AUG 12-15, 2012
CL San Diego, CA
SP SPIE
ID HYPER-RAYLEIGH SCATTERING; DEOXYRIBONUCLEIC-ACID; ETHIDIUM BROMIDE;
COUMARIN
AB Biopolymers such as DNA can be used as a host material for nonlinear optical dyes for photonic applications. In previous work by Heckman et al. (Proc. SPIE 6401, 640108-2), the chromophore Disperse Red 1 (DR1) was combined with CTMA-DNA (a water-insoluble DNA/surfactant complex) to produce an electro-optic waveguide modulator. However, DR1 does not bind strongly to DNA and has a low first hyperpolarizability (beta). We have used theory-aided design to develop and synthesize a novel chromophore with strong affinity for DNA and higher beta than DR1. We have also developed a surfactant containing a photocrosslinkable moiety that can be used to harden thin films of the DNA/surfactant/dye composite under ultraviolet light. The optical and thermal properties of these materials and outlook for device applications will be discussed.
C1 [Johnson, Lewis E.; Latimer, Luke N.; Benight, Stephanie J.; Watanabe, Zachary H.; Elder, Delwin L.; Robinson, Bruce H.] Univ Washington, Seattle, WA 98195 USA.
[Depotter, Griet; Clays, Koen] Katholieke Univ Leuven, B-3001 Leuven, Belgium.
[Bartsch, Carrie M.; Heckman, Emily M.] Sensors Directorate, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Johnson, LE (reprint author), Univ Washington, Seattle, WA 98195 USA.
FU Air Force Research Laboratory; NSF STC- MDITR [DMR- 0120967]
FX The authors thank the Air Force Research Laboratory, the NSF STC- MDITR
( DMR- 0120967), and the UW Student Technology Fund for financial
support, as well as Andreas Tillack, Josh Davies, Meghana Rawal, and Wes
Winn for technical assistance, and Rose Ann Cattolico and William Hardin
for collaboration regarding additional uses for these materials, and
James Grote, Bruce Eichinger, and Larry Dalton for useful discussion.
NR 35
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Z9 2
U1 0
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9181-7
J9 PROC SPIE
PY 2012
VL 8464
AR 84640D
DI 10.1117/12.964958
PG 10
WC Nanoscience & Nanotechnology; Materials Science, Characterization &
Testing; Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BDG17
UT WOS:000313079800007
ER
PT S
AU Joyce, DM
Venkat, N
Ouchen, F
Singh, KM
Smith, SR
Grote, JG
AF Joyce, Donna M.
Venkat, Narayanan
Ouchen, Fahima
Singh, Kristi M.
Smith, Steven R.
Grote, James G.
BE Kobayashi, N
Ouchen, F
Rau, I
TI Bio-dielectric organic-inorganic hybrid films for potential energy
storage applications
SO NANOBIOSYSTEMS: PROCESSING, CHARACTERIZATION, AND APPLICATIONS V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanobiosystems - Processing, Characterization, and
Applications V
CY AUG 12-15, 2012
CL San Diego, CA
SP SPIE
DE DNA; DNA-CTMA; bio-dielectrics; sol-gel; dielectric constant; dielectric
loss factor; electric field strength
ID COMPOSITE
AB DNA-based bio-dielectrics incorporating sol-gel have been investigated for energy storage applications. Salmon DNA hybrid films blending sol-gel-ceramics with DNA-CTMA have potential for increased dielectric constants and higher environmental stability compared to DNA only films. Thin film capacitor devices were fabricated and characterized, showing stability in dielectric properties and reliability in voltage breakdown measurements, attaining values consistently at 300 V/um. Temperature-dependent dielectric properties as well as dielectric stability as a function of thermal cycling of these hybrid films are also discussed.
C1 [Joyce, Donna M.; Venkat, Narayanan; Ouchen, Fahima; Singh, Kristi M.; Smith, Steven R.; Grote, James G.] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Joyce, DM (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 10
TC 1
Z9 1
U1 1
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9181-7
J9 PROC SPIE
PY 2012
VL 8464
AR 84640T
DI 10.1117/12.932387
PG 6
WC Nanoscience & Nanotechnology; Materials Science, Characterization &
Testing; Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BDG17
UT WOS:000313079800014
ER
PT S
AU Mamangun, D
Navarathne, D
Sotzing, GA
Lombardi, JP
Bartsch, CM
Heckman, EM
Singh, KM
Grote, JG
Nelson, TR
AF Mamangun, Donna
Navarathne, Daminda
Sotzing, Gregory A.
Lombardi, Jack P.
Bartsch, Carrie M.
Heckman, Emily M.
Singh, Kristi M.
Grote, James G.
Nelson, Thomas R., Jr.
BE Kobayashi, N
Ouchen, F
Rau, I
TI Optoelectronics using DNA as a template for dyes
SO NANOBIOSYSTEMS: PROCESSING, CHARACTERIZATION, AND APPLICATIONS V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanobiosystems - Processing, Characterization, and
Applications V
CY AUG 12-15, 2012
CL San Diego, CA
SP SPIE
DE DNA-CTMA; FRET; dyes; optoelectronics; solid-state device
ID DEOXYRIBONUCLEIC-ACID; FLUORESCENCE; NANOFIBERS
AB Aside from salmon DNA, other DNA sources were explored namely, herring and onion, to prepare DNA-surfactant complex, which will be used as a template for dyes undergoing Forster Resonance Energy Transfer (FRET). Also, salmon DNA of low and high molecular weight were compared. This study aims to assess the effect of using different DNA sources and molecular weight on the efficiency of energy transfer between the dyes, coumarin 480 (Cm 480) and 4-[4-(dimethylamino) styryl]-1-docosyl-pyridinium bromide (Hemi 22 and to understand the fundamental properties of DNA-CTMA as a supporting matrix for optoelectronics applications.
C1 [Mamangun, Donna; Navarathne, Daminda; Sotzing, Gregory A.] Univ Connecticut, 55 N Eagleville Rd, Storrs, CT 06269 USA.
[Lombardi, Jack P.; Bartsch, Carrie M.; Heckman, Emily M.; Singh, Kristi M.; Grote, James G.; Nelson, Thomas R., Jr.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Mamangun, D (reprint author), Univ Connecticut, 55 N Eagleville Rd, Storrs, CT 06269 USA.
NR 17
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9181-7
J9 PROC SPIE
PY 2012
VL 8464
AR 84640I
DI 10.1117/12.931261
PG 6
WC Nanoscience & Nanotechnology; Materials Science, Characterization &
Testing; Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BDG17
UT WOS:000313079800009
ER
PT S
AU Pawlik, G
Radosz, W
Mitus, AC
Mysliwiec, J
Miniewicz, A
Kajzar, F
Rau, I
Grote, JG
AF Pawlik, G.
Radosz, W.
Mitus, A. C.
Mysliwiec, J.
Miniewicz, A.
Kajzar, F.
Rau, I.
Grote, J. G.
BE Kobayashi, N
Ouchen, F
Rau, I
TI Kinetics of grating inscription in DR1:DNA-CTMA thin film: experiment
and semi-intercalation approach
SO NANOBIOSYSTEMS: PROCESSING, CHARACTERIZATION, AND APPLICATIONS V
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Nanobiosystems - Processing, Characterization, and
Applications V
CY AUG 12-15, 2012
CL San Diego, CA
SP SPIE
DE DR1:DNA-CTMA; diffraction grating; degenerate two-wave mixing; Monte
Carlo; bond-fluctuating; void
ID MONTE-CARLO SIMULATIONS; AZOBENZENE CHROMOPHORES; POLYMER MATRIX
AB The semi-intercalation hypothesis(1-5) which states that an azo-dye Disperse Red 1 (DR1) molecule intercalates in a specific way into a biopolymeric material made of DNA complexed with the cationic surfactant CTMA, has successfully explained the main experimental results(6) of laser dynamic inscription of diffraction gratings: short response time, low diffraction efficiency, single-exponential kinetics and flat wavelength dependence.(4) Recent experiments indicate that the inscription of the grating displays some features of non-exponential behavior. To understand this complex dynamics we characterize local environment of polymeric chains in Monte Carlo modelling by analyzing some features of local free-volume (void) distribution.
C1 [Pawlik, G.; Radosz, W.; Mitus, A. C.] Wroclaw Univ Technol, Inst Phys, Wybrzeze Wyspianskiego 27, PL-50370 Wroclaw, Poland.
[Mysliwiec, J.; Miniewicz, A.] Wroclaw Univ Technol, Inst Phys & Theoret Chem, PL-50370 Wroclaw, Poland.
[Kajzar, F.; Rau, I.] Univ Politehn Bucuresti, Fac Appl Chem & Mat Sci, Bucharest, Romania.
[Rau, I.] Univ dAngers, Inst Sci & Technol, MOLTECH, CNRS, F-75700 Paris, France.
[Grote, J. G.] Air Force Res Lab, Wright Patterson Air Force Base, Air Force Base, OH USA.
RP Pawlik, G (reprint author), Wroclaw Univ Technol, Inst Phys, Wybrzeze Wyspianskiego 27, PL-50370 Wroclaw, Poland.
RI Mysliwiec, Jaroslaw/B-5198-2015; RAU, ILEANA/A-8981-2008;
OI RAU, ILEANA/0000-0002-0780-9502; Miniewicz, Andrzej/0000-0003-2470-6246
FU National Science Centre [NN507 322440]; Polish National Science Centre
[Dec- 2011/ 01/ B/ ST5/ 00773]; Romanian Ministry of Education,
Research, Youth and Sports, through the UEFISCDI organism [279/
7.10.2011, PN- II- ID- PCE- 2011- 3- 05053]
FX G. P. thanks Polish National Science Centre for financial support under
Grant NN507 322440. J. M. thanks Polish National Science Centre for
financial support ( Dec- 2011/ 01/ B/ ST5/ 00773). I. R. and F. K.
acknowledge the financial support of Romanian Ministry of Education,
Research, Youth and Sports, through the UEFISCDI organism, under
Contract Number 279/ 7.10.2011, Code Project PN- II- ID- PCE- 2011- 3-
05053.
NR 18
TC 4
Z9 4
U1 0
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9181-7
J9 PROC SPIE
PY 2012
VL 8464
AR 846404
DI 10.1117/12.931230
PG 7
WC Nanoscience & Nanotechnology; Materials Science, Characterization &
Testing; Optics
SC Science & Technology - Other Topics; Materials Science; Optics
GA BDG17
UT WOS:000313079800003
ER
PT J
AU Comitz, E
Valacer, J
Lindsay, D
Scaduto, A
Fogler, KA
Dyche, J
AF Comitz, E.
Valacer, J.
Lindsay, D.
Scaduto, A.
Fogler, K. A.
Dyche, J.
TI SLEEP AND PERFORMANCE: THE IMPACT OF PERSONALITY
SO SLEEP
LA English
DT Meeting Abstract
CT Annual Meeting of the Associated-Professional-Sleep-Societies (APSS)
CY JUN 09-13, 2012
CL Boston, MA
SP Associated Professi Sleep Soc (APSS)
C1 [Comitz, E.; Valacer, J.; Fogler, K. A.; Dyche, J.] James Madison Univ, Dept Psychol, Harrisonburg, VA 22807 USA.
[Scaduto, A.] Penn State Univ, University Pk, PA 16802 USA.
[Lindsay, D.] USAF Acad, Colorado Springs, CO 80840 USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER ACAD SLEEP MEDICINE
PI WESTCHESTER
PA ONE WESTBROOK CORPORATE CTR, STE 920, WESTCHESTER, IL 60154 USA
SN 0161-8105
J9 SLEEP
JI Sleep
PY 2012
VL 35
SU S
MA 0330
BP A115
EP A116
PG 2
WC Clinical Neurology; Neurosciences
SC Neurosciences & Neurology
GA 063KH
UT WOS:000312996500332
ER
PT J
AU Fogler, KA
Thoreson, K
Glidewell, RN
Orr, W
Zumas, B
Hall, K
Whitehurst, L
Dyche, J
AF Fogler, K. A.
Thoreson, K.
Glidewell, R. N.
Orr, W.
Zumas, B.
Hall, K.
Whitehurst, L.
Dyche, J.
TI RECOVERY SLEEP IN A NATURALLY OCCURRING SLEEP DEPRIVED POPULATION
SO SLEEP
LA English
DT Meeting Abstract
CT Annual Meeting of the Associated-Professional-Sleep-Societies (APSS)
CY JUN 09-13, 2012
CL Boston, MA
SP Associated Professi Sleep Soc (APSS)
C1 [Fogler, K. A.; Hall, K.; Whitehurst, L.; Dyche, J.] James Madison Univ, Dept Psychol, Harrisonburg, VA 22807 USA.
[Glidewell, R. N.; Orr, W.] Lynn Inst Rockies, Colorado Springs, CO USA.
[Thoreson, K.] USAF Acad, Colorado Springs, CO 80840 USA.
[Zumas, B.] Rutgers State Univ, Grad Sch Appl Psychol, Piscataway, NJ USA.
NR 0
TC 0
Z9 0
U1 0
U2 0
PU AMER ACAD SLEEP MEDICINE
PI WESTCHESTER
PA ONE WESTBROOK CORPORATE CTR, STE 920, WESTCHESTER, IL 60154 USA
SN 0161-8105
J9 SLEEP
JI Sleep
PY 2012
VL 35
SU S
MA 0338
BP A118
EP A118
PG 1
WC Clinical Neurology; Neurosciences
SC Neurosciences & Neurology
GA 063KH
UT WOS:000312996500340
ER
PT S
AU Hyde, MW
Havrilla, MJ
AF Hyde, Milo W.
Havrilla, Michael J.
GP IEEE
TI Design of an Open-Ended Coaxial Probe for Broadband, Low-Footprint
Nondestructive Characterization of PEC-Backed Materials
SO 2012 IEEE INTERNATIONAL INSTRUMENTATION AND MEASUREMENT TECHNOLOGY
CONFERENCE (I2MTC)
SE IEEE Instrumentation and Measurement Technology Conference
LA English
DT Proceedings Paper
CT IEEE International Instrumentation and Measurement Technology Conference
(I2MTC)
CY MAY 13-16, 2012
CL Graz, AUSTRIA
SP IEEE, IEEE Instrumentat & Measurement Soc, IEEE Austria Sect, TU Graz, Virtual Vehicle Competence Ctr, Obuda Univ, European Acad Sci & Arts, Austrian Acad Sci, Int Soc Petr Engineers, Drilling Syst Automat Tech Sect, Arbeitskreis Hochschullehrer Messtechnik e.V. (AHMT), Joanneum Res, Austrian Ctr Competence Mechatron (ACCM), Platform Artemis Austria
ID FULL-WAVE ANALYSIS; DIELECTRIC MEASUREMENTS; PERMITTIVITY; MICROWAVE;
FREQUENCIES; TISSUES
AB The design of an open-ended coaxial probe for the nondestructive characterization of PEC-backed materials is presented. The design attempts to maximize the measurement bandwidth while limiting the size of the probe flange plate. These design criteria are met by analyzing the theoretical reflection coefficient's behavior versus frequency and the coaxial line's inner radius. Included in this paper are the theoretical derivation of the reflection coefficient, accomplished using Love's equivalence theorem, the parallel-plate Green's function, and the Method of Moments (MoM), and the results of the design analysis. Future work is also discussed.
C1 [Hyde, Milo W.; Havrilla, Michael J.] USAF, Dept Elect & Comp Engn, Inst Technol, Dayton, OH 45433 USA.
RP Hyde, MW (reprint author), USAF, Dept Elect & Comp Engn, Inst Technol, Dayton, OH 45433 USA.
EM milo.hyde@afit.edu
NR 16
TC 2
Z9 2
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1091-5281
BN 978-1-4577-1771-0
J9 IEEE IMTC P
PY 2012
BP 1599
EP 1602
PG 4
WC Engineering, Electrical & Electronic; Instruments & Instrumentation
SC Engineering; Instruments & Instrumentation
GA BCA46
UT WOS:000309449100298
ER
PT S
AU Alekseenko, A
Josyula, E
AF Alekseenko, A.
Josyula, E.
BE Mareschal, M
Santos, A
TI Deterministic Solution of the Boltzmann Equation Using a Discontinuous
Galerkin Velocity Discretization
SO 28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012, VOLS. 1 AND
2
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 28th International Symposium on Rarefied Gas Dynamics (RGD)
CY JUL 09-13, 2012
CL Zaragoza, SPAIN
SP Minist Econ & Competitividad, Govt Aragon, Dept Ind & Innovat, Aragoneese Agcy Res & Dev (ARAID), Univ Zaragoza, Zaragoza Sci Ctr Adv Modeling (ZCAM), Inst Biocomputat & Study Complex Syst (BiFi), Parallel Interface Direct Simulat Monte Carlo (PIDSMC) Software Inc
DE Boltzmann collision operator; discontinuous Galerkin methods
AB We propose an approach for high order discretization of the Boltzmann equation in the velocity space using discontinuous Galerkin methods. Our approach employs a reformulation of the collision integral in the form of a bilinear operator with a time-independent kernel. In the fully non-linear case the complexity of the method is O(n(8)) operations per spatial cell where n is the number of degrees of freedom in one velocity direction. The new method is suitable for parallelization to a large number of processors. Techniques of automatic perturbation decomposition and linearisation are developed to achieve additional performance improvement. The number of operations per spatial cell in the linearised regime is O(n(6)). The method is applied to the solution of the spatially homogeneous relaxation problem. Mass momentum and energy is conserved to a good precision in the computed solutions.
C1 [Alekseenko, A.] Calif State Univ Northridge, Dept Math, Northridge, CA 91330 USA.
[Alekseenko, A.; Josyula, E.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Alekseenko, A (reprint author), Calif State Univ Northridge, Dept Math, Northridge, CA 91330 USA.
NR 11
TC 2
Z9 2
U1 0
U2 2
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1115-9
J9 AIP CONF PROC
PY 2012
VL 1501
BP 279
EP 286
DI 10.1063/1.4769523
PG 8
WC Engineering, Aerospace; Astronomy & Astrophysics
SC Engineering; Astronomy & Astrophysics
GA BDB01
UT WOS:000312411200035
ER
PT S
AU Burt, JM
Josyula, E
Blankson, IM
AF Burt, Jonathan M.
Josyula, Eswar
Blankson, Isaiah M.
BE Mareschal, M
Santos, A
TI DSMC-Based Uncertainty Quantification for a Hypersonic Shock Interaction
Flow
SO 28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012, VOLS. 1 AND
2
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 28th International Symposium on Rarefied Gas Dynamics (RGD)
CY JUL 09-13, 2012
CL Zaragoza, SPAIN
SP Minist Econ & Competitividad, Govt Aragon, Dept Ind & Innovat, Aragoneese Agcy Res & Dev (ARAID), Univ Zaragoza, Zaragoza Sci Ctr Adv Modeling (ZCAM), Inst Biocomputat & Study Complex Syst (BiFi), Parallel Interface Direct Simulat Monte Carlo (PIDSMC) Software Inc
DE hypersonic flow; uncertainty quantification; sensitivity analysis; DSMC
ID SIMULATIONS
AB A global Monte Carlo approach for sensitivity analysis (SA) and uncertainty quantification (UQ) is integrated with a new DSMC code, and SA/UQ calculations are performed for a hypersonic double cone flow involving multiple shock-shock and shock-boundary layer interactions. Several input parameter uncertainties are considered, with different techniques utilized for inclusion of aleatory and epistemic uncertainties. Over 900 simulations, requiring more than100,000 CPU hours, are performed as part of this work, and dominant sources of uncertainty are identified for both local and global output quantities. Simulation results are compared with published computational data to ensure simulation accuracy under nominal flow conditions, and UQ results are employed to help explain discrepancies between DSMC results and experimental measurements. Aleatory uncertainty in inflow velocity is found to be the dominant contributor to the total force and surface pressure at the primary shock impingement point, while epistemic uncertainty in the wall vibrational thermal accommodation coefficient is the leading source of uncertainty in impingement point heat flux and the total convective heat transfer rate. paper.
C1 [Burt, Jonathan M.; Josyula, Eswar] USAF, Res Lab, Wright Patterson AFB, OH 45432 USA.
[Blankson, Isaiah M.] NASA, Glenn Res Ctr, Cleveland, OH 44135 USA.
RP Burt, JM (reprint author), USAF, Res Lab, Wright Patterson AFB, OH 45432 USA.
NR 10
TC 0
Z9 0
U1 0
U2 3
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1115-9
J9 AIP CONF PROC
PY 2012
VL 1501
BP 573
EP 578
DI 10.1063/1.4769593
PG 6
WC Engineering, Aerospace; Astronomy & Astrophysics
SC Engineering; Astronomy & Astrophysics
GA BDB01
UT WOS:000312411200074
ER
PT S
AU Martin, RS
Cambier, JL
AF Martin, Robert Scott
Cambier, Jean-Luc
BE Mareschal, M
Santos, A
TI Low Noise Fractional NTC Collisions for DSMC
SO 28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012, VOLS. 1 AND
2
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 28th International Symposium on Rarefied Gas Dynamics (RGD)
CY JUL 09-13, 2012
CL Zaragoza, SPAIN
SP Minist Econ & Competitividad, Govt Aragon, Dept Ind & Innovat, Aragoneese Agcy Res & Dev (ARAID), Univ Zaragoza, Zaragoza Sci Ctr Adv Modeling (ZCAM), Inst Biocomputat & Study Complex Syst (BiFi), Parallel Interface Direct Simulat Monte Carlo (PIDSMC) Software Inc
DE Particle Collisions; DSMC; PIC; Adaptive Methods
AB The ability to accurately simulate rare high energy collisions such as those found in ionization and combustion reactions is important to the advancement of the study of non-equilibrium behavior of these phenomena. A major difficulty for modeling these systems with particle codes is that chain-branching reactions result in exponential growth regimes for certain species. This work considers the use of fractional collision models in place of statistically sampled collision models combined with merging of computational particles to reduce statistical noise while avoiding runaway computational cost.
C1 [Martin, Robert Scott; Cambier, Jean-Luc] USAF, Res Lab, ERC Inc, Edwards AFB, CA 93524 USA.
RP Martin, RS (reprint author), USAF, Res Lab, ERC Inc, Edwards AFB, CA 93524 USA.
NR 6
TC 0
Z9 0
U1 0
U2 3
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1115-9
J9 AIP CONF PROC
PY 2012
VL 1501
BP 615
EP 620
DI 10.1063/1.4769599
PG 6
WC Engineering, Aerospace; Astronomy & Astrophysics
SC Engineering; Astronomy & Astrophysics
GA BDB01
UT WOS:000312411200080
ER
PT S
AU Gimelshein, N
Gimelshein, S
Ketsdever, A
Young, M
AF Gimelshein, Natalia
Gimelshein, Sergey
Ketsdever, Andrew
Young, Marcus
BE Mareschal, M
Santos, A
TI Wind Compensation by Radiometer Arrays in High Altitude Propulsion
SO 28TH INTERNATIONAL SYMPOSIUM ON RAREFIED GAS DYNAMICS 2012, VOLS. 1 AND
2
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 28th International Symposium on Rarefied Gas Dynamics (RGD)
CY JUL 09-13, 2012
CL Zaragoza, SPAIN
SP Minist Econ & Competitividad, Govt Aragon, Dept Ind & Innovat, Aragoneese Agcy Res & Dev (ARAID), Univ Zaragoza, Zaragoza Sci Ctr Adv Modeling (ZCAM), Inst Biocomputat & Study Complex Syst (BiFi), Parallel Interface Direct Simulat Monte Carlo (PIDSMC) Software Inc
DE Radiometers; kinetic methods; high altitude propulsion
ID FORCES
AB Numerical analysis has been conducted to assess the feasibility of using radiometer arrays mounted on a near-space vehicle, for wind disturbance compensation. The results indicate the possibility of using radiometric force for that purpose for altitudes of 80 km and smaller, and head winds up to 30 m/s.
C1 [Gimelshein, Natalia; Gimelshein, Sergey] ERC Inc, Edwards AFB, CA 93524 USA.
[Ketsdever, Andrew; Young, Marcus] Propuls Directorate, Edwards AFB, Edwards AFB, CA 93524 USA.
RP Gimelshein, N (reprint author), ERC Inc, Edwards AFB, CA 93524 USA.
FU Air Force Research Laboratory's Propulsion Directorate, Edwards AFB, CA
FX The authors wish to acknowledge the support of the Advanced Concepts
Group of the Air Force Research Laboratory's Propulsion Directorate,
Edwards AFB, CA.
NR 15
TC 0
Z9 0
U1 0
U2 0
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1115-9
J9 AIP CONF PROC
PY 2012
VL 1501
BP 1522
EP 1528
DI 10.1063/1.4769719
PG 7
WC Engineering, Aerospace; Astronomy & Astrophysics
SC Engineering; Astronomy & Astrophysics
GA BDB01
UT WOS:000312411200200
ER
PT J
AU Samimi, A
Scales, WA
Bernhardt, PA
Briczinski, SJ
Selcher, CA
McCarrick, MJ
AF Samimi, A.
Scales, W. A.
Bernhardt, P. A.
Briczinski, S. J.
Selcher, C. A.
McCarrick, M. J.
TI On ion gyro-harmonic structuring in the stimulated electromagnetic
emission spectrum during second electron gyro-harmonic heating
SO ANNALES GEOPHYSICAE
LA English
DT Article
DE Ionosphere; Active experiments; Plasma waves and instabilities
ID DOWNSHIFTED PEAK; UPPER HYBRID; IONOSPHERE; FREQUENCY; INSTABILITY;
WAVES
AB Recent observations show that, during ionospheric heating experiments at frequencies near the second electron gyro-harmonic, discrete spectral lines separated by harmonics of the ion-gyro frequency appear in the stimulated electromagnetic emission (SEE) spectrum within 1 kHz of the pump frequency. In addition to the ion gyro-harmonic structures, on occasion, a broadband downshifted emission is observed simultaneously with these spectral lines. Parametric decay of the pump field into upper hybrid/electron Bernstein (UH/EB) and low-frequency ion Bernstein (IB) and oblique ion acoustic (IA) modes is considered responsible for generation of these spectral features. Guided by predictions of an analytical model, a two-dimensional particle-in-cell (PIC) computational model is employed to study the nonlinear processes during such heating experiments. The critical parameters that affect the spectrum, such as whether discrete gyroharmonic on broadband structures is observed, include angle of the pump field relative to the background magnetic field, pump field strength, and proximity of the pump frequency to the gyro-harmonic. Significant electron heating along the magnetic field is observed in the parameter regimes considered.
C1 [Samimi, A.; Scales, W. A.] Virginia Tech, Bradley Dept Elect & Comp Engn, Blacksburg, VA 24061 USA.
[Bernhardt, P. A.; Briczinski, S. J.] USN, Res Lab, Div Plasma Phys, Washington, DC 20375 USA.
[Selcher, C. A.] USAF, Res Lab, Kirtland, NM 87417 USA.
[McCarrick, M. J.] Marsh Creek LLC, Gakona, AK USA.
RP Samimi, A (reprint author), Virginia Tech, Bradley Dept Elect & Comp Engn, Blacksburg, VA 24061 USA.
EM arsamimi@vt.edu
FU National Science Foundation; NRL 6.1 base program; NRC postdoc program
FX The work at Virginia Tech is supported by the National Science
Foundation. The work at the Naval Research Laboratory was supported by
the NRL 6.1 base program. S. J. Briczinski is sponsored by the NRC
postdoc program.
NR 18
TC 7
Z9 7
U1 0
U2 6
PU COPERNICUS GESELLSCHAFT MBH
PI GOTTINGEN
PA BAHNHOFSALLEE 1E, GOTTINGEN, 37081, GERMANY
SN 0992-7689
J9 ANN GEOPHYS-GERMANY
JI Ann. Geophys.
PY 2012
VL 30
IS 11
BP 1587
EP 1594
DI 10.5194/angeo-30-1587-2012
PG 8
WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology &
Atmospheric Sciences
SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences
GA 058WT
UT WOS:000312666300003
ER
PT J
AU Balasis, G
Daglis, IA
Zesta, E
Papadimitriou, C
Georgiou, M
Haagmans, R
Tsinganos, K
AF Balasis, G.
Daglis, I. A.
Zesta, E.
Papadimitriou, C.
Georgiou, M.
Haagmans, R.
Tsinganos, K.
TI ULF wave activity during the 2003 Halloween superstorm: multipoint
observations from CHAMP, Cluster and Geotail missions
SO ANNALES GEOPHYSICAE
LA English
DT Article
DE Magnetospheric physics; Magnetospheric configuration and dynamics;
Plasma waves and instabilities; Storms and substorms
ID NEAR-EARTH MAGNETOTAIL; SOLAR-WIND; MAGNETIC STORMS; RADIATION BELTS;
RECOVERY PHASE; RING CURRENT; MAGNETOSPHERE; PULSATIONS; FIELD;
SATELLITE
AB We examine data from a topside ionosphere and two magnetospheric missions (CHAMP, Cluster and Geotail) for signatures of ultra low frequency (ULF) waves during the exceptional 2003 Halloween geospace magnetic storm, when Dst reached similar to -380 nT. We use a suite of wavelet-based algorithms, which are a subset of a tool that is being developed for the analysis of multi-instrument multi-satellite and ground-based observations to identify ULF waves and investigate their properties. Starting from the region of topside ionosphere, we first present three clear and strong signatures of Pc3 ULF wave activity (frequency 15-100 mHz) in CHAMP tracks. We then expand these three time intervals for purposes of comparison between CHAMP, Cluster and Geotail Pc3 observations but also to be able to search for Pc4-5 wave signatures (frequency 1-10 mHz) into Cluster and Geotail measurements in order to have a more complete picture of the ULF wave occurrence during the storm. Due to the fast motion through field lines in a low Earth orbit (LEO) we are able to reliably detect Pc3 (but not Pc4-5) waves from CHAMP. This is the first time, to our knowledge, that ULF wave observations from a topside ionosphere mission are compared to ULF wave observations from magnetospheric missions. Our study provides evidence for the occurrence of a number of prominent ULF wave events in the Pc3 and Pc4-5 bands during the storm and offers a platform to study the wave evolution from high altitudes to LEO. The ULF wave analysis methods presented here can be applied to observations from the upcoming Swarm multi-satellite mission of ESA, which is anticipated to enable joint studies with the Cluster mission.
C1 [Balasis, G.; Daglis, I. A.; Papadimitriou, C.; Georgiou, M.] Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Athens, Greece.
[Zesta, E.] USAF, Res Lab, RVBXP, Hanscom AFB, MA USA.
[Papadimitriou, C.; Georgiou, M.; Tsinganos, K.] Univ Athens, Dept Phys, Sect Astrophys Astron & Mech, GR-10679 Athens, Greece.
[Haagmans, R.] European Space Agcy, European Space Res & Technol Ctr, NL-2200 AG Noordwijk, Netherlands.
RP Balasis, G (reprint author), Natl Observ Athens, Inst Astron Astrophys Space Applicat & Remote Sen, Athens, Greece.
EM gbalasis@noa.gr
RI Balasis, Georgios/G-8680-2012; Daglis, Ioannis/L-6100-2013;
Papadimitriou, Constantinos/M-4061-2013
OI Balasis, Georgios/0000-0001-7342-0557; Daglis,
Ioannis/0000-0002-0764-3442;
FU European Space Agency [ESTEC 4000103770/11/NL/JA/ef]; European Community
[284520]
FX This work has received funding from the European Space Agency under
contract ESTEC 4000103770/11/NL/JA/ef and from the European Community's
Seventh Framework Programme under grant agreement no. 284520. We
gratefully acknowledge ESA's Cluster Active Archive, DARTS at the
Institute of Space and Astronautical Science, JAXA in Japan, and
Helmholtz Centre Potsdam GFZ, German Research Centre for Geosciences,
for supplying data used in this study.
NR 59
TC 14
Z9 14
U1 1
U2 8
PU COPERNICUS GESELLSCHAFT MBH
PI GOTTINGEN
PA BAHNHOFSALLEE 1E, GOTTINGEN, 37081, GERMANY
SN 0992-7689
J9 ANN GEOPHYS-GERMANY
JI Ann. Geophys.
PY 2012
VL 30
IS 12
BP 1751
EP 1768
DI 10.5194/angeo-30-1751-2012
PG 18
WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology &
Atmospheric Sciences
SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences
GA 058WV
UT WOS:000312666500013
ER
PT S
AU Bostick, RL
Perram, GP
AF Bostick, Randall L.
Perram, Glen P.
BE Kamerman, GW
Steinvall, O
Lewis, KL
Hollins, RC
Merlet, TJ
Gruneisen, MT
Dusek, M
Rarity, JG
Bishop, GJ
Gonglewski, J
TI Chromotomosynthesis for high speed hyperspectral imagery
SO ELECTRO-OPTICAL REMOTE SENSING, PHOTONIC TECHNOLOGIES, AND APPLICATIONS
VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Electro-Optical Remote Sensing, Photonic Technologies, and
Applications VI
CY SEP 24-26, 2012
CL Edinburgh, SCOTLAND
SP SPIE, SELEX GALILEO, THALES
DE Hyperspectral imager; chromotomosynthesis; direct vision prism;
battlespace combustion events
AB A rotating direct vision prism, chromotomosynthetic imaging (CTI) system operating in the visible creates hyperspectral imagery by collecting a set of 2D images with each spectrally projected at a different rotation angle of the prism. Mathematical reconstruction techniques that have been well tested in the field of medical physics are used to reconstruct the data to produce the 3D hyperspectral image. The instrument operates with a 100 mm focusing lens in the spectral range of 400-900 nm with a field of view of 71.6 mrad and angular resolution of 0.8-1.6 mu rad. The spectral resolution is 0.6 nm at the shortest wavelengths, degrading to over 10 nm at the longest wavelengths. Measurements using a point-like target show that performance is limited by chromatic aberration. The accuracy and utility of the instrument is assessed by comparing the CTI results to spatial data collected by a wideband image and hyperspectral data collected using a liquid crystal tunable filter (LCTF). The wide-band spatial content of the scene reconstructed from the CTI data is of same or better quality as a single frame collected by the undispersed imaging system with projections taken at every 1 degrees. Performance is dependent on the number of projections used, with projections at 5 degrees producing adequate results in terms of target characterization. The data collected by the CTI system can provide spatial information of equal quality as a comparable imaging system, provide high-frame rate slitless 1-D spectra, and generate 3-D hyperspectral imagery which can be exploited to provide the same results as a traditional multi-band spectral imaging system. While this prototype does not operate at high speeds, components exist which will allow for CTI systems to generate hyperspectral video imagery at rates greater than 100 Hz. The instrument has considerable potential for characterizing bomb detonations, muzzle flashes, and other battlefield combustion events.
C1 [Bostick, Randall L.; Perram, Glen P.] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
RP Bostick, RL (reprint author), USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
NR 34
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9283-8
J9 PROC SPIE
PY 2012
VL 8542
AR 85422E
DI 10.1117/12.972283
PG 12
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BDA59
UT WOS:000312346500063
ER
PT S
AU Gruneisen, MT
Black, JP
Dymale, RC
Stoltenberg, KE
AF Gruneisen, Mark T.
Black, James P.
Dymale, Raymond C.
Stoltenberg, Kurt E.
BE Kamerman, GW
Steinvall, O
Lewis, KL
Hollins, RC
Merlet, TJ
Gruneisen, MT
Dusek, M
Rarity, JG
Bishop, GJ
Gonglewski, J
TI Projective quantum measurements on spatial modes of the photon with
transmission volume holograms
SO ELECTRO-OPTICAL REMOTE SENSING, PHOTONIC TECHNOLOGIES, AND APPLICATIONS
VI
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Electro-Optical Remote Sensing, Photonic Technologies, and
Applications VI
CY SEP 24-26, 2012
CL Edinburgh, SCOTLAND
SP SPIE, SELEX GALILEO, THALES
DE quantum key distribution; optical vortices; photon linear momentum;
photon orbital angular momentum; computer-generated holography; volume
holography; spatial light modulators; projective quantum measurements
AB Transmission volume holograms are evaluated as quantum projectors operating on spatial modes of the photon in mutually unbiased bases (MUBs). With applications to free-space quantum key distribution (QKD) in mind, state spaces based on rectilinear and azimuthal phase modes (i.e. photon linear and orbital angular momenta) are considered. Rectilinear phase modulation is shown to result in both greater mode densities for a receiving aperture in the far field and better efficiency and cross-talk characteristics when volume holograms are used as de-multiplexing elements. Two- and four-dimensional state spaces are defined via rectilinear phase modes and the complex optical fields of the MUBs are calculated and generated with a spatial light modulator in order to record and subsequently illuminate transmission volume holograms. Using holograms prepared in lithium niobate, diffraction efficiencies are measured for the 36 permutations associated with projecting the six MUB states of a two-dimensional state space onto the same six MUB states. Quantum measurements associated with cascaded projection operations in a four-dimensional state space are performed using photo-thermo-refractive glass holograms. Experimental results show approximate agreement with the inner-product relationships that describe quantum projection probabilities.
C1 [Gruneisen, Mark T.] USAF, Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
[Black, James P.; Dymale, Raymond C.; Stoltenberg, Kurt E.] Boeing Co, Albuquerque, NM 87185 USA.
RP Gruneisen, MT (reprint author), USAF, Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
FU Air Force Office of Scientific Research.
FX We gratefully acknowledge Vladimir Markov for providing us the lithium
niobate sample used in this work and instruction in its use. This work
was supported by the Air Force Office of Scientific Research.
NR 13
TC 1
Z9 1
U1 1
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9283-8
J9 PROC SPIE
PY 2012
VL 8542
AR 85421Q
DI 10.1117/12.979681
PG 14
WC Engineering, Electrical & Electronic; Optics
SC Engineering; Optics
GA BDA59
UT WOS:000312346500048
ER
PT S
AU Varshney, V
Roy, AK
Lee, J
Dudis, DS
Farmer, BL
AF Varshney, Vikas
Roy, Ajit K.
Lee, Jonghoon
Dudis, Douglas S.
Farmer, Barry L.
BE Pipe, KP
TI Helicity Induced Thermal Conductivity Reduction in Superlattice
Nanowires
SO PHONONS 2012: XIV INTERNATIONAL CONFERENCE ON PHONON SCATTERING IN
CONDENSED MATTER
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT 14th International Conference on Phonon Scattering in Condensed Matter
(PHONONS)
CY JUL 08-12, 2012
CL Campus Univ Michigan, Ann Arbor, MI
SP Univ Michigan, Coll Engn, Univ Michigan, Coll Literature, Sci, & Arts, Univ Michigan, Dept Phys, Univ Michigan, Dept Mech Engn, Univ Michigan, Off Vice President Res, IMRA Amer, Inc
HO Campus Univ Michigan
DE Helix; Thermoelectrics; Molecular Dynamics; Thermal Conductivity;
Silicon Nanowires
ID ENHANCED THERMOELECTRIC PERFORMANCE; SILICON NANOWIRES; NANOSPRINGS;
TEMPLATES; NANOBELTS; NANORODS; COILING; SYSTEMS; POWER
AB In this study, we have performed non-equilibrium molecular dynamics (NEMD) simulations to investigate thermal transport properties of 'model' bi-component helical nanowires. The results indicate that significant reduction in thermal conductivity, similar to that of flat superlattice nanostructures, can be achieved using a helical geometric configuration. The reduction is attributed to a plethora of transmissive and reflective phonon scattering events resulting from the steady alteration of phonon propagating direction that emerges from the continuous rotation of the helical interface. We also show that increasing the relative mass ratio of the two components lowers the phonon energy transmission at the interface (differences in vibrational frequency spectrum), thereby relatively 'easing' the phonon energy propagation along the helical pathway. While the proposed mechanisms result in a reduced lattice thermal conductivity, the continuous nature of the bi-component nanowire would not be expected to significantly reduce its electrical counterpart, as often occurs in superlattice/alloy nanostructures. Hence, we believe that the helical configuration of atomic arrangement should be a very attractive, general approach for improved thermoelectric material assemblies independent of the specific chemical composition.
C1 [Varshney, Vikas; Roy, Ajit K.; Lee, Jonghoon; Dudis, Douglas S.; Farmer, Barry L.] USAF, Mat & Mfg Directorate, Res Lab, Dayton, OH 45433 USA.
RP Varshney, V (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Dayton, OH 45433 USA.
NR 35
TC 0
Z9 0
U1 2
U2 13
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1124-1
J9 AIP CONF PROC
PY 2012
VL 1506
BP 28
EP 34
DI 10.1063/1.4772520
PG 7
WC Physics, Applied; Physics, Condensed Matter
SC Physics
GA BDC10
UT WOS:000312543600005
ER
PT S
AU Cao, YC
Ren, W
AF Cao, Yongcan
Ren, Wei
GP IEEE
TI Finite-time Consensus for Second-order Systems with Unknown Inherent
Nonlinear Dynamics Under an Undirected Switching Graph
SO 2012 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 27-29, 2012
CL Montreal, CANADA
SP Boeing Co, Bosch, Corning, Eaton, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, Xerox, Adept MobileRobots, Momentum Press, Quanser, SIAM, Springer, Taylor & Francis, United Technologies Res Ctr, Visual Solut, Wiley-Blackwell
ID MULTIAGENT SYSTEMS; NETWORKS; AGENTS
AB This paper studies finite-time consensus for networked multi-agent systems with second-order dynamics in the presence of unknown inherent nonlinear dynamics under an undirected switching interaction graph. In particular, all agents are assumed to share a common sensing range. More precisely, each agent can only communicate with other agents who are within the sensing range of itself. We propose a nonlinear distributed consensus algorithm and present sufficient conditions to guarantee that consensus can be achieved in finite time.
C1 [Cao, Yongcan] USAF, Res Lab, Control Sci Ctr Excellence, Wright Patterson AFB, OH 45433 USA.
[Ren, Wei] Univ Calif Riverside, Dept Elect Engn, Riverside, CA 95521 USA.
RP Cao, YC (reprint author), USAF, Res Lab, Control Sci Ctr Excellence, Wright Patterson AFB, OH 45433 USA.
OI Cao, Yongcan/0000-0003-3383-0185
FU National Science Foundation CAREER Award [ECCS0748287]
FX This work was supported by a National Science Foundation CAREER Award
(ECCS0748287).
NR 17
TC 9
Z9 10
U1 0
U2 2
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
SN 0743-1619
BN 978-1-4577-1096-4; 978-1-4577-1095-7
J9 P AMER CONTR CONF
PY 2012
BP 26
EP 31
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BCN53
UT WOS:000310776200005
ER
PT S
AU Weiss, A
Kolmanovsky, I
Baldwin, M
Erwin, RS
AF Weiss, Avishai
Kolmanovsky, Ilya
Baldwin, Morgan
Erwin, R. Scott
GP IEEE
TI Model Predictive Control of Three Dimensional Spacecraft Relative Motion
SO 2012 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 27-29, 2012
CL Montreal, CANADA
SP Boeing Co, Bosch, Corning, Eaton, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, Xerox, Adept MobileRobots, Momentum Press, Quanser, SIAM, Springer, Taylor & Francis, United Technologies Res Ctr, Visual Solut, Wiley-Blackwell
AB This paper further develops an approach for spacecraft relative motion control based on the application of linear quadratic Model Predictive Control (MPC) with dynamically reconfigurable constraints. Previous results for maneuvers confined to the orbital plane are extended to three dimensional maneuvers with three dimensional Line-of-Sight (LoS) constraint handling. The MPC controller is designed to prescribe Delta upsilon impulsive velocity changes rather than piecewise constant thrust profiles. The ability to transition between MPC guidance in the spacecraft rendezvous phase and MPC guidance in the spacecraft docking phase, with requirements, constraints, and sampling rates specific to each phase, is demonstrated. Bandwidth constraints of the spacecraft attitude control system and exhaust plume direction constraints are also addressed. The MPC controller is validated on the full nonlinear model of spacecraft orbital motion and augmented with an Extended Kalman Filter (EKF) to estimate spacecraft states based on relative angles and relative range measurements.
C1 [Weiss, Avishai; Kolmanovsky, Ilya] Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA.
[Baldwin, Morgan; Erwin, R. Scott] AF Res Lab, Space Vehicle Directorate, Albuquerque, NM USA.
RP Weiss, A (reprint author), Univ Michigan, Dept Aerosp Engn, Ann Arbor, MI 48109 USA.
EM weiss.avishai@gmail.com; ilya@umich.edu; afrl.rvsv@kirtland.af.mil
FU ASEE through the Air Force Summer Faculty Fellow Program (SFFP)
FX This work was supported by ASEE through the Air Force Summer Faculty
Fellow Program (SFFP).
NR 15
TC 8
Z9 8
U1 0
U2 5
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
SN 0743-1619
BN 978-1-4577-1096-4; 978-1-4577-1095-7
J9 P AMER CONTR CONF
PY 2012
BP 173
EP 178
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BCN53
UT WOS:000310776200029
ER
PT S
AU Basset, G
Xu, YJ
Pham, K
AF Basset, Gareth
Xu, Yunjun
Khanh Pham
GP IEEE
TI Feasibility and Detection of a Bio-Inspired Approach for Space
Situational Awareness
SO 2012 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 27-29, 2012
CL Montreal, CANADA
SP Boeing Co, Bosch, Corning, Eaton, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, Xerox, Adept MobileRobots, Momentum Press, Quanser, SIAM, Springer, Taylor & Francis, United Technologies Res Ctr, Visual Solut, Wiley-Blackwell
DE Space situation awareness; Rendezvous; Bio-inspired strategy
ID MOTION CAMOUFLAGE
AB In nature, many biological species have devised motion strategies that help them with a variety of tasks, such as mating and foraging. One such phenomenon that has been recently studied in hoverflies involves a moving male hoverfly that conceals its motion from the viewpoint of a moving female hoverfly. The use of this bio-inspired strategy has also recently been considered in the context of Space Situational Awareness. In this paper, the feasibilities of applying the bio-inspired technique to free flying space vehicles are investigated. Furthermore, the detectability of the motion strategy is studied. Both the feasibilities and the detectability are investigated in the local vertical and local horizontal frame.
C1 [Basset, Gareth; Xu, Yunjun] Univ Cent Florida, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA.
[Khanh Pham] US Air Force, Dept Aerosp Engn, Air Force Res Lab, Kirtland AFB, NM 87117 USA.
RP Basset, G (reprint author), Univ Cent Florida, Dept Mech Mat & Aerosp Engn, Orlando, FL 32816 USA.
EM gbasset@knights.ucf.edu; yunjunxu@mail.ucf.edu;
Khanh.Pham@kirtland.af.mil
FU Air Force Research Laboratory through the Space Scholar Program
FX The author would like to thank the Air Force Research Laboratory for
supporting this research through the Space Scholar Program.
NR 16
TC 0
Z9 0
U1 0
U2 1
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
SN 0743-1619
BN 978-1-4577-1096-4; 978-1-4577-1095-7
J9 P AMER CONTR CONF
PY 2012
BP 956
EP 960
PG 5
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BCN53
UT WOS:000310776201039
ER
PT S
AU Cao, YC
Ren, W
AF Cao, Yongcan
Ren, Wei
GP IEEE
TI Finite-time Consensus for Single-integrator Kinematics with Unknown
Inherent Nonlinear Dynamics Under a Directed Interaction Graph
SO 2012 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 27-29, 2012
CL Montreal, CANADA
SP Boeing, Bosch, Corning, Eaton, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, Xerox, Adept MobileRobots, Momentum Press, Quanser, SIAM, Springer, Taylor & Francis, United Technologies Res Ctr, Visual Solut, Wiley-Blackwell
ID MULTIAGENT SYSTEMS; AUTONOMOUS AGENTS; NETWORKS; SYNCHRONIZATION;
ALGORITHMS
AB This paper deals with the finite-time consensus for single-integrator kinematics with unknown inherent nonlinear dynamics under a directed interaction graph. A distributed nonlinear algorithm is proposed to solve the problem given that some sufficient conditions are satisfied. Due to the existence of the unknown inherent nonlinear dynamics and the desired finite-time convergence property, the stability analysis is challenging because the traditional stability tools frequently used in solving the consensus problem cannot be applied here. For this purpose, we propose a novel comparison based stability tool, which plays an important role in the stability analysis of the proposed algorithm.
C1 [Cao, Yongcan] USAF, Control Sci Ctr Excellence, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Cao, YC (reprint author), USAF, Control Sci Ctr Excellence, Res Lab, Wright Patterson AFB, OH 45433 USA.
OI Cao, Yongcan/0000-0003-3383-0185
NR 20
TC 4
Z9 4
U1 0
U2 0
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
SN 0743-1619
BN 978-1-4577-1096-4
J9 P AMER CONTR CONF
PY 2012
BP 1603
EP 1608
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BCN53
UT WOS:000310776201143
ER
PT S
AU Luo, J
Cooper, J
Cao, CY
Pham, K
AF Luo, Jie
Cooper, John
Cao, Chengyu
Khanh Pham
GP IEEE
TI Cooperative Adaptive Control of a Two-Agent System
SO 2012 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 27-29, 2012
CL Montreal, CANADA
SP Boeing Co, Bosch, Corning, Eaton, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, Xerox, Adept MobileRobots, Momentum Press, Quanser, SIAM, Springer, Taylor & Francis, United Technologies Res Ctr, Visual Solut, Wiley-Blackwell
ID MULTIAGENT SYSTEMS; CONSENSUS; FLOCKING; NETWORKS; AGENTS; LEADER
AB In this paper, a new cooperative control framework using L-1 adaptive control is presented for a two-agent dynamic system with uncertainties. In this framework, each agent uses the L-1 adaptive control law to handle both local uncertainties and interconnected uncertainties from the effects of the other agent's control signals and dynamics. The global objective is achieved when each agent achieves its local objective. The stability condition for the closed-loop global dynamic system is derived. Simulation results illustrate the presented cooperative control framework.
C1 [Luo, Jie; Cooper, John; Cao, Chengyu] Univ Connecticut, Dept Mech Engn, Storrs, CT 06269 USA.
[Khanh Pham] US Air Force Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Luo, J (reprint author), Univ Connecticut, Dept Mech Engn, Storrs, CT 06269 USA.
EM jie.luo@uconn.edu; john.cooper@uconn.edu; ccao@engr.uconn.edu;
AFRL.RVSV@kirtland.af.mil
FU Air Force Summer Faculty Fellowship Program at the Air Force Research
Laboratory Space Vehicles Directorate
FX This research was partially supported by the Air Force Summer Faculty
Fellowship Program at the Air Force Research Laboratory Space Vehicles
Directorate.
NR 14
TC 0
Z9 0
U1 0
U2 0
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
SN 0743-1619
BN 978-1-4577-1096-4; 978-1-4577-1095-7
J9 P AMER CONTR CONF
PY 2012
BP 2413
EP 2418
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BCN53
UT WOS:000310776202115
ER
PT S
AU Phillips, S
Sanfelice, RG
Erwin, RS
AF Phillips, Sean
Sanfelice, Ricardo G.
Erwin, R. Scott
GP IEEE
TI On the Synchronization of Two Impulsive Oscillators under Communication
Constraints
SO 2012 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 27-29, 2012
CL Montreal, CANADA
SP Boeing Co, Bosch, Corning, Eaton, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, Xerox, Adept MobileRobots, Momentum Press, Quanser, SIAM, Springer, Taylor & Francis, United Technologies Res Ctr, Visual Solut, Wiley-Blackwell
ID SYSTEMS
AB The problem of establishing synchronization of a class of impulsive oscillators is considered. Each impulsive oscillator is modeled as a hybrid system that self resets to zero when its state reaches a threshold and is externally reset via an impulsive update law when information from other oscillators is received. At every reset to zero, the oscillators broadcast a packet and select a different communication channel. The mechanism resembles that of a firefly model in which the external resets correspond to flashes of the fireflies. Oscillators can only receive information when they are on the same channel that a packet was broadcast. This mechanism leads to the possibility of information loss. Under such a communication constraint, we show that the coupled impulsive oscillators (almost globally) synchronize their channel selections. To establish this result, we model the interconnection of oscillators as a hybrid system and apply recently developed Lyapunov stability tools. Numerical simulations are included to illustrate the results.
C1 [Phillips, Sean; Sanfelice, Ricardo G.] Univ Arizona, Dept Aerosp & Mech Engn, 1130 N Mt Ave, Tucson, AZ 85721 USA.
[Erwin, R. Scott] US Air Force, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
RP Phillips, S (reprint author), Univ Arizona, Dept Aerosp & Mech Engn, 1130 N Mt Ave, Tucson, AZ 85721 USA.
EM sap86@email.arizona.edu; sricardo@u.arizona.edu
RI Sanfelice, Ricardo/K-3062-2014;
OI Phillips, Sean/0000-0001-9074-6049
FU U.S. Air Force Summer Faculty Fellowship Program; American Society for
Engineering Education; National Science Foundation under CAREER
[ECS-1150306]
FX Research partially supported by the U.S. Air Force Summer Faculty
Fellowship Program, American Society for Engineering Education, and the
National Science Foundation under CAREER Grant no. ECS-1150306. The
authors are indebted to Clayton Chu who helped implementing in the test
bed the two agents/two channels hybrid system, to Tom Cleary for the
initial research that led to this paper, and to David Copp for his help
developing the hybrid simulator used for numerical analysis.
NR 13
TC 2
Z9 2
U1 0
U2 2
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
SN 0743-1619
BN 978-1-4577-1096-4; 978-1-4577-1095-7
J9 P AMER CONTR CONF
PY 2012
BP 2443
EP 2448
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BCN53
UT WOS:000310776202120
ER
PT S
AU Sharma, R
Beard, RW
Taylor, CN
Pack, D
AF Sharma, Rajnikant
Beard, Randal W.
Taylor, Clark N.
Pack, Daniel
GP IEEE
TI Bearing-only Cooperative Geo-Localization using Unmanned Aerial Vehicles
SO 2012 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 27-29, 2012
CL Montreal, CANADA
SP Boeing, Bosch, Corning, Eaton, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, Xerox, Adept MobileRobots, Momentum Press, Quanser, SIAM, Springer, Taylor & Francis, United Technologies Res Ctr, Visual Solut, Wiley-Blackwell
AB In this paper, we present a cooperative approach to geo-localize a ground target using bearing-only localization of Unmanned Aerial Vehicles (UAVs). We design a distributed path planning algorithm using receding horizon control, which improves the localization accuracy of the target and of all of the air vehicles simultaneously while satisfying the observability conditions. We show that the cooperative bearing-only localization removes the constraint of having global position and heading information to all of the vehicles, as long as the sensor network is connected and at least one of the vehicle has GPS measurements. We include simulation results for bearing-only cooperative target geo-localization of a stationary and a mobile ground target demonstrating the feasibility of our proposed methods
C1 [Sharma, Rajnikant; Pack, Daniel] USAF Acad, Dept Elect & Comp Engn, Colorado Springs, CO 80840 USA.
RP Sharma, R (reprint author), USAF Acad, Dept Elect & Comp Engn, Colorado Springs, CO 80840 USA.
EM raj.drdo@gmail.com; beard@ee.byu.edu; Clark.Taylor@wpafb.af.mil;
Daniel.Pack@usafa.edu
NR 15
TC 1
Z9 1
U1 0
U2 1
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
SN 0743-1619
BN 978-1-4577-1096-4
J9 P AMER CONTR CONF
PY 2012
BP 3883
EP 3888
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BCN53
UT WOS:000310776204030
ER
PT S
AU Sunberg, Z
Chakravorty, S
Erwin, R
AF Sunberg, Z.
Chakravorty, S.
Erwin, R.
GP IEEE
TI Information Space Receding Horizon Control for Multi-Agent Systems
SO 2012 AMERICAN CONTROL CONFERENCE (ACC)
SE Proceedings of the American Control Conference
LA English
DT Proceedings Paper
CT American Control Conference (ACC)
CY JUN 27-29, 2012
CL Montreal, CANADA
SP Boeing Co, Bosch, Corning, Eaton, GE Global Res, Honeywell, MathWorks, Mitsubishi Elect Res Lab, Natl Instruments, Xerox, Adept MobileRobots, Momentum Press, Quanser, SIAM, Springer, Taylor & Francis, United Technologies Res Ctr, Visual Solut, Wiley-Blackwell
AB In this paper, we present a receding horizon solution to the problem of optimal scheduling for multiple sensors monitoring a group of dynamical targets. The term 'target' is used here in the classic sense of being the object that is being sensed or observed by the sensors. This problem is motivated by the Space Situational Awareness (SSA) problem. The multi-sensor optimal scheduling problem can be posed as a multi-agent Partially Observed Markov Decision Process (POMDP) whose solution is given by an Information Space (I-space) Dynamic Programming (DP) problem. We present a simulation based stochastic optimization technique that exploits the structure inherent in the problem to obtain variance reduction along with a distributed solution. This stochastic optimization technique is combined with a receding horizon approach which obviates the need to solve the computationally intractable multi-agent I-space DP problem and hence, makes the technique computationally tractable for such problems. The technique is tested on a simple numerical example which is nonetheless computationally intractable for existing solution techniques.
C1 [Sunberg, Z.; Chakravorty, S.] Texas A&M Univ, College Stn, TX 77843 USA.
[Erwin, R.] Air Force Res Lab, Space Vehicles Directortate, Albuquerque, NM USA.
RP Sunberg, Z (reprint author), Texas A&M Univ, College Stn, TX 77843 USA.
EM sunbergzach@gmail.com; schakrav@aero.tamu.edu
NR 33
TC 1
Z9 1
U1 0
U2 2
PU IEEE COMPUTER SOC
PI LOS ALAMITOS
PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 USA
SN 0743-1619
BN 978-1-4577-1096-4; 978-1-4577-1095-7
J9 P AMER CONTR CONF
PY 2012
BP 5246
EP 5251
PG 6
WC Automation & Control Systems; Engineering, Electrical & Electronic
SC Automation & Control Systems; Engineering
GA BCN53
UT WOS:000310776205091
ER
PT S
AU Kim, MJ
Hyde, MW
AF Kim, Mu J.
Hyde, Milo W.
BE Bones, PJ
Fiddy, MA
Millane, RP
TI Adaptive binary material classification of an unknown object using
polarimetric images degraded by atmospheric turbulence
SO IMAGE RECONSTRUCTION FROM INCOMPLETE DATA VII
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Image Reconstruction from Incomplete Data VII
CY AUG 14-15, 2012
CL San Diego, CA
SP SPIE
DE deconvolution; polarimetric imagery; material classification; passive
remote sensing; atmospheric turbulence; degree of polarization
AB An improved binary material-classification algorithm using passive polarimetric imagery degraded by atmospheric turbulence is presented. The technique implements a modified version of an existing polarimetric blind-deconvolution algorithm in order to remove atmospheric distortion and correctly classify the unknown object. The classification decision, dielectric or metal in this case, is based on degree of linear polarization (DoLP) estimates provided by the blind-deconvolution algorithm augmented by two DoLP priors - one statistically modeling the polarization behavior of metals and the other statistically modeling the polarization behavior of dielectrics. The DoLP estimate which maximizes the log-likelihood function determines the image pixel's classification. The method presented here significantly improves upon a similar published polarimetric classification method by adaptively updating the DoLP priors as more information becomes available about the scene. This new adaptive method significantly extends the range of validity of the existing polarimetric classification technique to near-normal collection geometries where most polarimetric material classifiers perform poorly. In this paper, brief reviews of the polarimetric blind-deconvolution algorithm and the functional forms of the DoLP priors are provided. Also provided is the methodology for making the algorithm adaptive including three techniques for updating the DoLP priors using in-progress DoLP estimates. Lastly, the proposed technique is experimentally validated by comparing classification results of two dielectric and metallic samples obtained using the new method to those obtained using the existing technique.
C1 [Kim, Mu J.] US Air Force, Res Lab, 3005 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Hyde, Milo W.] US Air Force, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Kim, MJ (reprint author), US Air Force, Res Lab, 3005 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM mu.kim@wpafb.af.mil
NR 12
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9217-3
J9 PROC SPIE
PY 2012
VL 8500
AR 85000G
DI 10.1117/12.929691
PG 11
WC Optics; Imaging Science & Photographic Technology
SC Optics; Imaging Science & Photographic Technology
GA BCZ41
UT WOS:000312165100016
ER
PT S
AU Moeller, TM
Smith, LM
Collins, FG
Labello, JM
Rogers, JP
Lowry, HS
Crider, DH
AF Moeller, Trevor M.
Smith, L. Montgomery
Collins, Frank G.
Labello, Jesse M.
Rogers, James P.
Lowry, Heard S.
Crider, Dustin H.
BE Straka, SA
Carosso, N
Egges, J
TI Measurement of the accumulation of water ice on optical components in
cryogenic vacuum environments
SO OPTICAL SYSTEM CONTAMINATION: EFFECTS, MEASUREMENTS, AND CONTROL 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Optical System Contamination - Effects, Measurements, and
Control
CY AUG 13, 2012
CL San Diego, CA
SP SPIE
DE Cryogenic; contamination; thin film; interference
AB An experiment was performed to study and measure the deposition of water (H2O) ice on optical component surfaces under high-vacuum cryogenic conditions. Water was introduced into a cryogenic vacuum chamber via a hydrated molecular sieve zeolite housed in a valved external chamber, through an effusion cell, and impinged upon a quartz-crystal microbalance (QCM) and first-surface gold-plated mirror. A laser and photodiode setup external to the vacuum chamber monitored the multiple-beam interference reflectance of the ice-mirror configuration while the QCM measured the mass deposition. Data acquired and analyzed from this experiment indicate that water ice under these conditions accumulates on optical component surfaces as a thin film up to thicknesses over 45 microns and can be detected and measured by nonintrusive optical methods based upon multiple-beam interference phenomena. The QCM, a well-established measurement technique, was used to validate the interferometer.
C1 [Moeller, Trevor M.; Smith, L. Montgomery; Collins, Frank G.; Labello, Jesse M.; Rogers, James P.] Univ Tennessee, Inst Space, 411 BH Goethert Pkwy, Tullahoma, TN 37388 USA.
[Lowry, Heard S.; Crider, Dustin H.] Arnold Engn Dev Ctr, Arnold AFB, TN 37389 USA.
RP Moeller, TM (reprint author), Univ Tennessee, Inst Space, 411 BH Goethert Pkwy, Tullahoma, TN 37388 USA.
EM tmoeller@utsi.edu
NR 14
TC 0
Z9 0
U1 0
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9209-8
J9 PROC SPIE
PY 2012
VL 8492
AR 849207
DI 10.1117/12.929089
PG 13
WC Optics
SC Optics
GA BCZ56
UT WOS:000312206600005
ER
PT S
AU Benson, MR
Marciniak, MA
Burks, JW
AF Benson, Michael R.
Marciniak, Michael A.
Burks, Jeffrey W.
BE Hanssen, LM
TI Measuring grazing-angle DHR with the Infrared Grazing Angle
Reflectometer
SO REFLECTION, SCATTERING, AND DIFFRACTION FROM SURFACES III
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Reflection, Scattering, and Diffraction from Surfaces III
CY AUG 13-16, 2012
CL San Diego, CA
SP SPIE
DE Directional Hemispherical Reflectance; Infrared; Grazing Angle;
reflectometer
AB The Infrared Grazing Angle Reflectometer allows measurement of Directional Hemispherical Reflectance (DHR) at very high angles of incidence (30 to 85 degrees) and at wavelengths ranging from 4.3 to 10.8 microns. A hemi-ellipsoidal mirror redirects the reflected light and reflects it on to a novel five-sided pyroelectric detector. The incident light intensity is measured and used in calculating the DHR of the sample. In this paper, the theory of operation of this detector is derived, and used to simulate the operation of the system. This simulation of the detector shows errors of 3% or less for both diffuse and specular samples, compared to the theoretical DHR. The calibration method defined in this paper allows for high accuracy and ease of use without knowing the specific attributes of the optics used in the system. Finally, collected DHR data is compared with the simulated data for comparison. Comparing the measured data to the simulation shows that the model correctly predicts the locations and trends of the scattered energy.
C1 [Benson, Michael R.; Marciniak, Michael A.] Air Force Inst Technol, Wright Patterson AFB, OH 45433 USA.
[Burks, Jeffrey W.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Benson, MR (reprint author), Air Force Inst Technol, Wright Patterson AFB, OH 45433 USA.
OI Marciniak, Michael/0000-0003-2879-5565
NR 7
TC 0
Z9 0
U1 0
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9212-8
J9 PROC SPIE
PY 2012
VL 8495
AR 84950R
DI 10.1117/12.931512
PG 12
WC Optics; Radiology, Nuclear Medicine & Medical Imaging
SC Optics; Radiology, Nuclear Medicine & Medical Imaging
GA BCZ58
UT WOS:000312210500021
ER
PT S
AU Ferrel, SS
Marciniak, MA
AF Ferrel, Simon S.
Marciniak, Michael A.
BE Hanssen, LM
TI Matrix determination of hidden object reflectance by indirect
photography
SO REFLECTION, SCATTERING, AND DIFFRACTION FROM SURFACES III
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Reflection, Scattering, and Diffraction from Surfaces III
CY AUG 13-16, 2012
CL San Diego, CA
SP SPIE
DE Indirect Photography; BRDF; Matrix Inversion
AB Indirect photography was recently demonstrated as a technique for imaging hidden objects. A camera and laser are collocated, neither with line-of-sight to the object. Laser light is reflected off a visible surface onto the hidden object, then reflected back to the visible surface and collected by the camera. Varying laser spot position yields different camera images, which are used to construct an "indirect" image of the object. Here, camera images are processed by modeling the system as a set of radiometric transport and reflectance matrices. Matrix formulation and inversion, and those parameters demonstrated to improve indirect image quality, are discussed.
C1 [Ferrel, Simon S.; Marciniak, Michael A.] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
RP Ferrel, SS (reprint author), USAF, Inst Technol, Dept Engn Phys, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
OI Marciniak, Michael/0000-0003-2879-5565
NR 12
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9212-8
J9 PROC SPIE
PY 2012
VL 8495
AR 84950Q
DI 10.1117/12.929095
PG 14
WC Optics; Radiology, Nuclear Medicine & Medical Imaging
SC Optics; Radiology, Nuclear Medicine & Medical Imaging
GA BCZ58
UT WOS:000312210500020
ER
PT S
AU Nauyoks, SE
Marciniak, MA
AF Nauyoks, Stephen E.
Marciniak, Michael A.
BE Hanssen, LM
TI Effects of a measurement floor on Mueller matrix measurements in a DRR
BSDF system
SO REFLECTION, SCATTERING, AND DIFFRACTION FROM SURFACES III
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Reflection, Scattering, and Diffraction from Surfaces III
CY AUG 13-16, 2012
CL San Diego, CA
SP SPIE
DE DDR; BRDF; polarimetric; scatterometery; noise floor
AB Since the bidirectional scatter distribution function (BSDF) is proportional to the intensity of the scattered light, a BSDF system with the addition of a dual rotating retarder system can be used to calculate the Mueller matrix of a scatterer. An advantage of a BSDF system is the large dynamic range which allows the measurement of scattered light both near to and far from the specular region. In some cases as measurements move away from the specular and into the scatter region, the measured signal decreases and the system reaches a measurement floor. Therefore, any BSDF and Mueller matrix measurements are dependent on the scatter from the sample and on the noise floor of the system. Since the noise floor of an electro-optical system is near constant, the Mueller matrix measurement of the noise floor will be that of a perfect depolarizer. As the measurement space moves away from the high-signal region, the scattered signal decreases and the floor of the system is approached so the Mueller matrix measurements can shift towards a perfect depolarizer. The rate and location of this shift will be dependent on how Lambertian the sample is and the ratio of signal to noise in the system. Because of this tendency, caution must be taken when drawing conclusions about the Mueller matrix of scattered light, particularly in the scatter measurement region where the measured signal approaches the system floor.
C1 [Nauyoks, Stephen E.; Marciniak, Michael A.] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
RP Nauyoks, SE (reprint author), USAF, Inst Technol, Dept Engn Phys, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
OI Marciniak, Michael/0000-0003-2879-5565
NR 14
TC 1
Z9 1
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9212-8
J9 PROC SPIE
PY 2012
VL 8495
AR 84950W
DI 10.1117/12.929915
PG 10
WC Optics; Radiology, Nuclear Medicine & Medical Imaging
SC Optics; Radiology, Nuclear Medicine & Medical Imaging
GA BCZ58
UT WOS:000312210500024
ER
PT S
AU Schafer, JM
Marciniak, MA
AF Schafer, Jessica M.
Marciniak, Michael A.
BE Hanssen, LM
TI The Focusing of Light Scattered from Diffuse Reflectors using Phase
Modulation
SO REFLECTION, SCATTERING, AND DIFFRACTION FROM SURFACES III
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Reflection, Scattering, and Diffraction from Surfaces III
CY AUG 13-16, 2012
CL San Diego, CA
SP SPIE
DE Phase modulation; indirect photography; inverse diffusion; BRDF;
scattering; liquid crystal spatial light modulator; beam steering;
enhancement
AB "Indirect photography" was recently demonstrated for imaging hidden scene information through the collection and radiometric modeling of light reflecting off of visible reflecting surfaces. The ability to focus the beam that reflects off the visible surface to a tight spot on the hidden object is theorized to simulate a direct line of sight from the light source to the object, reducing the radiometric model to that of the previously demonstrated "dual photography." Experiments involving the focusing of light transmitted through highly scattering media have been adapted to the case of reflection. The focusing of a HeNe laser reflected off diffusely scattering surfaces to a tight spot is demonstrated using phase control. A liquid crystal spatial light modulator assigns pixelated phase delay to the beam to conjugate the scattering properties of the reflector. Intensity enhancement values between 13.8 and 122.3 are achieved for the surfaces studied. Samples with relatively strong specular reflection achieve higher enhancement for a given geometry. More diffusely reflecting materials achieve higher enhancement in regions of nonspecular scatter, facilitating non-mechanical beam steering.
C1 [Schafer, Jessica M.; Marciniak, Michael A.] USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
RP Schafer, JM (reprint author), USAF, Inst Technol, Dept Engn Phys, Wright Patterson AFB, OH 45433 USA.
OI Marciniak, Michael/0000-0003-2879-5565
NR 8
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9212-8
J9 PROC SPIE
PY 2012
VL 8495
AR 84950O
DI 10.1117/12.929714
PG 17
WC Optics; Radiology, Nuclear Medicine & Medical Imaging
SC Optics; Radiology, Nuclear Medicine & Medical Imaging
GA BCZ58
UT WOS:000312210500018
ER
PT S
AU Cain, SC
AF Cain, Stephen C.
BE Dolne, JJ
Karr, TJ
Gamiz, VL
TI Multi-frame fusion of undersampled 3D imagery
SO UNCONVENTIONAL IMAGING AND WAVEFRONT SENSING 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference of the Unconventional Imaging and Wavefront Sensing
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE LADAR; Microscanning; Resolution Enhancement
AB 3D imaging LADAR Avalanche Photo-Diode (APD) arrays are emerging as an important technology for future generation remote sensing and reconnaissance systems. One important limiting factor in their development is the pixel pitch, which is typically 100 micrometers. This makes the spatial resolution of an APD array at least 10 times lower than their Charge Coupled Device (CCD) array counterparts. With the development of smaller pixel-pitch APD arrays in 3D applications that rival those of CCD's used in 2D imaging many years away, this research endeavors to fuse 3D images with poor spatial resolution with 2D images to obtain superior spatial and range resolution.
Microscanning or dithering is a technique used to combine multiple images of the same scene to obtain a more densely sampled version. This techniques has been applied successfully to both 2D and 3D imagery. In this paper, a standard microscanning approach is compared to a new technique involving the use of a properly sampled 2D image combined with multiple low-resolution 3D images in order to obtain a more densely sample 3D image. The comparison will report the mean squared range error obtained from the traditional microscanning approach and the new 2D/3D fusion approach as a function of the number of 3D frames used in the image reconstruction. Since the 2D image contains no range information, improvements in mean squared range error by the new algorithm demonstrate its ability to successfully fuse 2D add 3D information.
C1 USAF, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Cain, SC (reprint author), USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
NR 6
TC 0
Z9 0
U1 0
U2 2
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9237-1
J9 PROC SPIE
PY 2012
VL 8520
AR 85200F
DI 10.1117/12.930524
PG 8
WC Optics; Physics, Applied
SC Optics; Physics
GA BDA58
UT WOS:000312346000009
ER
PT S
AU Dayton, D
Nolasco, R
Myers, M
Sena, JP
Oliver, J
Even, D
Hill, B
AF Dayton, David
Nolasco, Rudolph
Myers, Michael
Sena, John-Paul
Oliver, Jeremy
Even, Detlev
Hill, Brian
BE Dolne, JJ
Karr, TJ
Gamiz, VL
TI Hyper-spectral measurements using a compact SWIR camera
SO UNCONVENTIONAL IMAGING AND WAVEFRONT SENSING 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference of the Unconventional Imaging and Wavefront Sensing
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
AB Recent advances in InGaAs camera technology has stimulated interest in the short wave infra-red (SWIR) band in the spectral region 0.84 - 1.7 mu m. Located between the visible and thermal infra-red, the SWIR band shows interesting properties of both. Images tends to have the look of the visible and are less affected by scattering from aerosol haze, however the solar irradiance is dropping rapidly with wavelength in the SWIR. Spectral signatures, particularly of paints and dyes, may be different in the SWIR band compared to the visible. For these reasons we have chosen to investigate hyper-spectral measurements in this band using the NovaSol mu HSI SWIR hyper-spectral imager system
C1 [Dayton, David; Nolasco, Rudolph] Appl Technol Associates, 1300 Britt SE, Albuquerque, NM 87123 USA.
[Myers, Michael; Sena, John-Paul; Oliver, Jeremy] Air Force Res Lab, Kirtland AFB, NM 87117 USA.
[Even, Detlev; Hill, Brian] NovaSol, Honolulu, HI 96813 USA.
RP Dayton, D (reprint author), Appl Technol Associates, 1300 Britt SE, Albuquerque, NM 87123 USA.
NR 2
TC 0
Z9 0
U1 0
U2 0
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9237-1
J9 PROC SPIE
PY 2012
VL 8520
AR 85200R
DI 10.1117/12.928620
PG 5
WC Optics; Physics, Applied
SC Optics; Physics
GA BDA58
UT WOS:000312346000020
ER
PT S
AU Dayton, D
Allen, J
Nolasco, R
Fertig, G
Myers, M
AF Dayton, David
Allen, Jeffrey
Nolasco, Rudolph
Fertig, Gregory
Myers, Michael
BE Dolne, JJ
Karr, TJ
Gamiz, VL
TI Comparison of Fast Correlation Algorithms for Target Tracking
SO UNCONVENTIONAL IMAGING AND WAVEFRONT SENSING 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference of the Unconventional Imaging and Wavefront Sensing
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE Fitts Algorithm; Fast Cross-Correlation; Phase Only Matched Filter;
LADAR
AB Laser Aided Detection and Ranging (LADAR) imaging systems can be used to provide high resolution imaging and tracking of moving targets at night. Central to the tracking system is a high speed correlation algorithm to determine target motion between sensor image frames. Several issues complicate the correlation calculations. These include coherent speckle noise and atmosphere induced scintillation of the illuminator beam. The Fitts correlation algorithm is commonly used because of its simplicity and speed. However it is only optimal when the shift between sensor frames is less than a pixel. In addition it can be sensitive to certain types of noise. Projection based phase only (PBPO) is another type of correlation algorithm that is also high speed and in many cases less sensitive to noise. In this paper we compare the Fitts algorithm with PBPO in terms of number of computations and noise immunity when used in a LADAR tracker.
C1 [Dayton, David; Allen, Jeffrey; Nolasco, Rudolph] Appl Technol Associates, 1300 Britt SE, Albuquerque, NM 87123 USA.
[Fertig, Gregory; Myers, Michael] Air Force Res Lab, Directed Energy, Kirtland AFB, NM 87117 USA.
RP Dayton, D (reprint author), Appl Technol Associates, 1300 Britt SE, Albuquerque, NM 87123 USA.
NR 9
TC 0
Z9 0
U1 0
U2 5
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9237-1
J9 PROC SPIE
PY 2012
VL 8520
AR 85200G
DI 10.1117/12.928548
PG 6
WC Optics; Physics, Applied
SC Optics; Physics
GA BDA58
UT WOS:000312346000010
ER
PT S
AU Dayton, DC
Nolasco, R
Sena, JP
Myers, M
Fertig, G
Oliver, J
AF Dayton, David C.
Nolasco, Rudolph
Sena, John-Paul
Myers, Michael
Fertig, Gregory
Oliver, Jeremy
BE Dolne, JJ
Karr, TJ
Gamiz, VL
TI Maximum a-posteriori LADAR Image estimation in the presence of
scintillation and speckle noise
SO UNCONVENTIONAL IMAGING AND WAVEFRONT SENSING 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference of the Unconventional Imaging and Wavefront Sensing
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE Blind Deconvolution; Maximum A-Posteriori Estimation; LADAR
ID BLIND DECONVOLUTION; ASTRONOMICAL IMAGES
AB Laser aided detection and ranging (LADAR) imaging systems are usually corrupted by several pathologic noises. Speckle noise is due to the coherent nature of the laser illuminator. Scintillation noise is introduced by atmospheric turbulence over the outgoing illumination path and manifests itself as a multiplicative noise in the imagery. These noises can be mitigated by a simple recursive averaging algorithm when looking at fixed targets in staring mode. However if the target under observation is moving with respect to the imaging platform, the averaging will cause the target image to smear. In such a case, a maximum a-posteriori (MAP) approach can be used to estimate localized statistics of the scene under observation as well as the scintillation. The parameter estimates can then be incorporated into a spatially and temporally adaptive averaging approach which mitigates the noise while at the same time preserving motion in the scene.
C1 [Dayton, David C.] Appl Technol Associates, 1300 Britt SE, Albuquerque, NM 87123 USA.
[Nolasco, Rudolph; Sena, John-Paul; Myers, Michael; Fertig, Gregory; Oliver, Jeremy] Air Force Res Lab, Kirtland AFB, NM 87117 USA.
RP Dayton, DC (reprint author), Appl Technol Associates, 1300 Britt SE, Albuquerque, NM 87123 USA.
NR 13
TC 0
Z9 0
U1 0
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9237-1
J9 PROC SPIE
PY 2012
VL 8520
AR 85200E
DI 10.1117/12.928581
PG 7
WC Optics; Physics, Applied
SC Optics; Physics
GA BDA58
UT WOS:000312346000008
ER
PT S
AU Farrell, TC
Sanchez, D
Smith, J
Holzman, J
Kelly, P
Brennan, T
Gallegos, A
Oesch, D
Kyrazis, D
AF Farrell, Thomas C.
Sanchez, Darryl
Smith, Julie
Holzman, Jason
Kelly, Patrick
Brennan, Terry
Gallegos, Anita
Oesch, Denis
Kyrazis, Demos
BE Dolne, JJ
Karr, TJ
Gamiz, VL
TI Understanding the physics of optical deep turbulence at the Earth's
boundary layer
SO UNCONVENTIONAL IMAGING AND WAVEFRONT SENSING 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference of the Unconventional Imaging and Wavefront Sensing
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE Adaptive optics; atmospheric propagation; deep turbulence;
micro-meteorology; boundary layer modeling; surface layer modeling
ID SONIC ANEMOMETER; REFRACTIVE-INDEX; SURFACE FLUXES; TEMPERATURE; HEAT;
SPECTRUM
AB The Air Force Research Laboratory (AFRL) is developing and extending a model of the boundary layer that takes, as input, common atmospheric measurements and ground condition parameters, and predicts key parameters of optical turbulence such as strength and inner scale. In order to anchor the model, a field campaign is also being conducted. The campaign will include co-located meteorological instruments and an open loop Hartmann wavefront sensor. Here, a portion of the boundary layer model is discussed: that relevant for the daytime surface layer. A sensitivity analysis of input parameters is presented.
C1 [Farrell, Thomas C.; Sanchez, Darryl; Smith, Julie; Holzman, Jason; Kelly, Patrick] USAF, Res Lab, Directed Energy Directorate, Kirtland AFB, NM USA.
RP Farrell, TC (reprint author), USAF, Res Lab, Directed Energy Directorate, Kirtland AFB, NM USA.
EM AFRL/RDSWorkflowOrgMailbox@kirtland.af.mil
FU Air Force Office of Scientific Research
FX We would like to express our gratitude to the Air Force Office of
Scientific Research for their support.
NR 23
TC 0
Z9 0
U1 0
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9237-1
J9 PROC SPIE
PY 2012
VL 8520
AR 85200H
DI 10.1117/12.931432
PG 15
WC Optics; Physics, Applied
SC Optics; Physics
GA BDA58
UT WOS:000312346000011
ER
PT S
AU Neff, BJ
Cain, SC
AF Neff, Brian J.
Cain, Stephen C.
BE Dolne, JJ
Karr, TJ
Gamiz, VL
TI Image restoration technique for motion-compensated frame averaged data
collected by 3D FLASH LADAR imaging system
SO UNCONVENTIONAL IMAGING AND WAVEFRONT SENSING 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference of the Unconventional Imaging and Wavefront Sensing
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE Gaussian mixture model; expectation maximization (EM); blind
deconvolution; LADAR; range estimation
ID BLIND DECONVOLUTION
AB A new image restoration algorithm is proposed to remove the effect of atmospheric turbulence on motion-compensated frame averaged data collected by a three dimensional FLASH Laser Radar (LADAR) imaging system. The algorithm simultaneously arrives at an enhanced image as well as Fried's seeing parameter through an Expectation Maximization (EM) technique. Unlike blind deconvolution algorithms that operate only on two dimensional images, this technique accounts for both the spatial and temporal mixing that is caused by the atmosphere through which the system is imaging. Additionally, due to the over-determined nature of this problem, the point-spread function parameterized by Fried's seeing parameter can be deduced without the requirement for additional assumptions or constraints. The utility of the approach lies in its application to laser illuminated imaging where processing time is important.
C1 [Neff, Brian J.; Cain, Stephen C.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
RP Neff, BJ (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
NR 15
TC 0
Z9 0
U1 0
U2 3
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9237-1
J9 PROC SPIE
PY 2012
VL 8520
AR 85200L
DI 10.1117/12.928081
PG 9
WC Optics; Physics, Applied
SC Optics; Physics
GA BDA58
UT WOS:000312346000015
ER
PT S
AU Pellizzari, C
Holmes, R
Knox, K
AF Pellizzari, Casey
Holmes, Richard
Knox, Keith
BE Dolne, JJ
Karr, TJ
Gamiz, VL
TI Intensity interferometry experiments and simulations
SO UNCONVENTIONAL IMAGING AND WAVEFRONT SENSING 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference of the Unconventional Imaging and Wavefront Sensing
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE Intensity Interferometry; Hanbury Brown Twiss; high-resolution imaging;
synthetic aperture imaging
ID TRIPLE CORRELATOR; TELESCOPE ARRAYS; PHASE; LIGHT
AB Intensity Interferometry is a form of imaging developed in the 1950's by Hanbury Brown and Twiss, which gave very early results for estimates of the diameters of stellar discs. It relies on the statistical properties of light to form an image by correlating the electronic signals measured independently and simultaneously at two or more separate collection telescopes. Its benefits are that it can provide very high resolution, can be very low in cost, does not require precision path matching, and is insensitive to atmospheric effects. Its disadvantages are that it has relatively poor SNR properties for larger telescope separations. An experiment is performed with three telescopes in Kihei, HI to investigate the potential for large-separation, high-resolution, multi-telescope operation. Simulations were performed to address key issues related to the experiment. Correlations were measured during lab checkouts, and also for early field testing. A compression scheme was developed to archive the raw data. The compression process had the added advantage of eliminating spurious electronic interference signals.
C1 [Pellizzari, Casey; Knox, Keith] USAF, Res Lab, 535 Lipoa Pkwy,Suite 200, Kihei, HI 96753 USA.
[Holmes, Richard] Boeing Inc, Kihei, HI 96753 USA.
RP Pellizzari, C (reprint author), USAF, Res Lab, 535 Lipoa Pkwy,Suite 200, Kihei, HI 96753 USA.
FU DARPA sponsor; MSSC technical team
FX The authors gratefully acknowledge the support of DARPA sponsor, Dr.
Travis Blake. The authors are especially thankful for technical insights
provided by Dr. David Hyland. We would also like to thank the following
for their support; Dr. Jim Riker, Ms. Laura Ulibarri, and Dr. Stacie
Williams, and Dr. Skip Williams. Thanks to Mr. Paul Kervin for the use
of 3 36- cm telescopes, and to Dr. Victor Gamiz for technical
consultation. The authors are also grateful for the support of the MSSC
technical team, especially including Dr. Edwin Walker, Joseph Toth, Paul
Weis, Shawn Haar, Christopher Shurilla, Jacob Lucas, and Robert Lytle of
Boeing, and Daron Nishimoto, Kawai, Kuluhiwa, Laurie Hozaki, Chad
Nagata, Dylan Schwarzmeier, and Amanda Yamamoto of Pacific Defense
Solutions.
NR 24
TC 4
Z9 5
U1 0
U2 1
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9237-1
J9 PROC SPIE
PY 2012
VL 8520
AR 85200J
DI 10.1117/12.930537
PG 17
WC Optics; Physics, Applied
SC Optics; Physics
GA BDA58
UT WOS:000312346000013
ER
PT S
AU Spencer, MF
Hyde, MW
AF Spencer, Mark F.
Hyde, Milo W.
BE Dolne, JJ
Karr, TJ
Gamiz, VL
TI An investigation of stair mode in optical phased arrays using tiled
apertures
SO UNCONVENTIONAL IMAGING AND WAVEFRONT SENSING 2012
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference of the Unconventional Imaging and Wavefront Sensing
CY AUG 13-14, 2012
CL San Diego, CA
SP SPIE
DE stair mode; array tilt; optical phased arrays; unobservable modes; fiber
lasers; adaptive optics
ID COHERENT BEAM COMBINATION; FIBER COLLIMATORS; ADAPTIVE ARRAY;
PROPAGATION; PROJECTION
AB With an optical phased array, the individual phases of a multi-fiber laser source can be manipulated by exploiting high-bandwidth phase loops to correct for aero-optical flow over the turret and free-stream atmospheric effects along the line of sight; however, rough surface scatter through laser-target interaction adds the additional constraints of speckle and depolarizing effects. In particular, speckle phenomena can cause unobservable modes to arise in the beam control system of optical phased arrays. One such unobservable mode is termed stair mode and is appropriately identified by a stair-step pattern of piston phase across the individual subapertures that comprise a tiled aperture. This paper investigates the effects of stair mode using wave-optics simulations. To represent different array fill factors in the source plane, both seven and 19 element hexagonal close-packed tiled apertures are used in the simulations along with both Gaussian and flat-top outgoing beamlets. Peak Strehl ratio and power in the bucket are calculated in the target plane for all simulation setups and are then averaged for multiple random realizations of stair mode step sizes. In addition, the stair mode target irradiance patterns are imaged with cameras which have decreasing aperture stop diameters. Initial results show that low resolution imaging conditions, i.e. an aperture stop on the order of a subaperture diameter, makes it difficult to distinguish between different realizations of stair mode using a separate camera sensor.
C1 [Spencer, Mark F.] USAF, Inst Technol, Dept Engn Phys, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Hyde, Milo W.] USAF, Inst Technol, Dept Elect & Comp Engn, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
RP Spencer, MF (reprint author), USAF, Inst Technol, Dept Engn Phys, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM mark.spencer@afit.edu
NR 21
TC 4
Z9 4
U1 0
U2 4
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9237-1
J9 PROC SPIE
PY 2012
VL 8520
AR 852006
DI 10.1117/12.942634
PG 15
WC Optics; Physics, Applied
SC Optics; Physics
GA BDA58
UT WOS:000312346000004
ER
PT S
AU Khalil, W
Wilson, J
Dupaix, B
Balasubramanian, S
Creech, GL
AF Khalil, W.
Wilson, J.
Dupaix, B.
Balasubramanian, S.
Creech, G. L.
GP IEEE
TI Toward Millimeter-Wave DACs: Challenges and Opportunities
SO 2012 IEEE COMPOUND SEMICONDUCTOR INTEGRATED CIRCUIT SYMPOSIUM (CSICS)
SE IEEE Compound Semiconductor Integrated Circuit Symposium Technical
Digest
LA English
DT Proceedings Paper
CT IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)
CY OCT 14-17, 2012
CL La Jolla, CA
SP IEEE
DE Digital to Analog Converters; DACs; High Speed DACs; DDS; Frequency
Synthesis; Interleaving
ID TO-ANALOG CONVERTER
AB As line widths in emerging III-V technologies approaching that of modern CMOS, the conception of high performance mixed signal designs such as digital to analog converters (DACs) in the mm-wave space becomes possible. While addressing the speed limitations, candidate III-Vs ((InP, GaAs and GaN) are known to suffer from increased switching power consumption, limited device yield and absolute accuracy. CMOS, on the other hand, has the benefit of low-power digital switching, fine resolution and scalability. Recent attempts in marrying the two technologies have been carried out in the DARPA COSMOS program, by integrating III-V type devices with CMOS circuits, so as to exploit the advantages of low-power digital CMOS and high-speed high-power InP. This paper presents some of the challenges as well as prospects in designing record speed and performance DACs in the COSMOS program while contrasting it to that of deeply-scaled CMOS. A multi-phase parallel DAC architecture is leveraged for ultra-wideband synthesis, to improve noise performance and achieve higher information rates. The architectural bounds between CMOS and InP as well as detailed circuit-level analysis of critical block elements will be highlighted.
C1 [Khalil, W.; Dupaix, B.; Balasubramanian, S.] Ohio State Univ, Electrosci Lab, Columbus, OH 43212 USA.
[Wilson, J.] Army Res Lab, Washington, DC 20314 USA.
[Creech, G. L.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Khalil, W (reprint author), Ohio State Univ, Electrosci Lab, Columbus, OH 43212 USA.
NR 11
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1550-8781
BN 978-1-4673-0929-5
J9 COMP SEMICOND INTEGR
PY 2012
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCY16
UT WOS:000311948600026
ER
PT S
AU Wu, QY
Quach, T
Mattamana, A
Elabd, S
Dooley, SR
McCue, JJ
Orlando, PL
Creech, GL
Khalil, W
AF Wu, Qiyang
Quach, Tony
Mattamana, Aji
Elabd, Salma
Dooley, Steve R.
McCue, Jamin J.
Orlando, Pompei L.
Creech, Gregory L.
Khalil, Waleed
GP IEEE
TI Design of Wide Tuning-Range mm-Wave VCOs Using Negative Capacitance
SO 2012 IEEE COMPOUND SEMICONDUCTOR INTEGRATED CIRCUIT SYMPOSIUM (CSICS)
SE IEEE Compound Semiconductor Integrated Circuit Symposium Technical
Digest
LA English
DT Proceedings Paper
CT IEEE Compound Semiconductor Integrated Circuit Symposium (CSICS)
CY OCT 14-17, 2012
CL La Jolla, CA
SP IEEE
DE Negative capacitance circuits; mm-wave integrated circuits; LC-VCOs;
wide tuning range VCOs
ID TRANSIMPEDANCE AMPLIFIERS; TECHNOLOGY; EXTENSION
AB Negative capacitance (NC) circuits of single-ended and differential topologies are presented, analyzed and characterized. The novel NC designs extend the bandwidth of conventional NC circuits while maintaining low power consumption. To compare the performance of the designs, a figure of merit (FOM) is proposed. A power and area efficient NC scheme employing a 130 nm CMOS technology is applied to a mm-wave LC Voltage Controlled Oscillator (LC-VCO) for demonstration. The VCO tuning range is extended by employing the NC circuit to cancel the parasitic capacitance of the LC-tank; resulting in a 35% tuning range increase as compared to the reference LC-VCO circuit. The NC-based LC-VCO achieved a 27% tuning range in the Q-Band, which is the highest reported. Measured results compare closely to the theoretical analysis of the LC-VCO operating from 34.5 - 45.4 GHz.
C1 [Wu, Qiyang; Elabd, Salma; McCue, Jamin J.; Khalil, Waleed] Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
[Quach, Tony; Mattamana, Aji; Dooley, Steve R.; Orlando, Pompei L.; Creech, Gregory L.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Wu, QY (reprint author), Ohio State Univ, Dept Elect & Comp Engn, Columbus, OH 43210 USA.
EM wuq@ece.osu.edu
FU Air Force Research Laboratory
FX This work was supported by the Air Force Research Laboratory.
NR 9
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1550-8781
BN 978-1-4673-0929-5
J9 COMP SEMICOND INTEGR
PY 2012
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCY16
UT WOS:000311948600025
ER
PT B
AU Reddick, RJ
Heilig, JV
Valdez, PL
AF Reddick, Richard J.
Heilig, Julian Vasquez
Valdez, Patrick L.
BE Hilton, AA
Wood, JL
Lewis, CW
TI BRIDGING A BLACK-BROWN DIVIDE? Black Male Students at a Hispanic-Serving
Institution
SO BLACK MALES IN POSTSECONDARY EDUCATION: EXAMINING THEIR EXPERIENCES IN
DIVERSE INSTITUTIONAL CONTEXTS
SE Contemporary Perspectives on Access Equity and Achievement
LA English
DT Article; Book Chapter
ID EDUCATION; AMERICAN; COLLEGE
AB The experiences of Black male students in many traditional higher education settings have been deleterious to their self-esteem and development. However, the picture at minority serving institutions (MSIs), such as historically Black colleges and universities (HBCUs), seems to be demonstrably different. One emerging type of MSI-the Hispanic-serving institution (HSI)-is worthy of investigation, as these institutions are on the increase. This qualitative research study explored the lived experiences of a group of Black male students at an HSI in Central Texas. Findings from a focus group revealed that Black male students were mostly unaware of the college's HSI status, felt that the HSI environment helped forge strong Black-Brown relations, and that the HSI was still a PWI in that they regularly dealt with racial concerns. The chapter concludes with recommendations for how HSI administrators, faculty, and campus constituents can simultaneously support the unique HSI campus environment and the positive development of Black male students.
C1 [Reddick, Richard J.] Univ Texas Austin, Coll Educ, Dept Educ Adm, Austin, TX 78712 USA.
[Reddick, Richard J.] Univ Texas Austin, Dept African & African Diaspora Studies, Austin, TX 78712 USA.
[Reddick, Richard J.] Univ Texas Austin, John L Warfield Ctr African & African Amer Studie, Austin, TX 78712 USA.
[Reddick, Richard J.] Univ Texas Austin, Gender & Sexual Ctr, Austin, TX 78712 USA.
[Heilig, Julian Vasquez] Univ Texas Austin, Ctr Mexican Amer Studies, Austin, TX 78712 USA.
[Valdez, Patrick L.] St Edwards Univ, Austin, TX USA.
[Valdez, Patrick L.] USAF, Wright Patterson AFB, OH USA.
RP Reddick, RJ (reprint author), Univ Texas Austin, Coll Educ, Dept Educ Adm, Austin, TX 78712 USA.
EM richard.reddick@austin.utexas.edu
NR 44
TC 0
Z9 0
U1 0
U2 1
PU INFORMATION AGE PUBLISHING-IAP
PI CHARLOTTE
PA PO BOX 79049, CHARLOTTE, NC 28271-7047 USA
BN 978-1-61735-932-3
J9 CONT PER ACCESS
PY 2012
BP 183
EP 207
PG 25
WC Education & Educational Research; Ethnic Studies
SC Education & Educational Research; Ethnic Studies
GA BCZ72
UT WOS:000312228500011
ER
PT J
AU Cung, K
Slater, RL
Cui, Y
Manivannan, S
Jones, SE
Ahmad, H
Nelson, CM
Naik, RR
McAlpine, MC
AF Cung, Kellye
Slater, Russell L.
Cui, Yue
Manivannan, Sriram
Jones, Sharon E.
Ahmad, Habib
Nelson, Celeste M.
Naik, Rajesh R.
McAlpine, Michael C.
TI Rapid, multiplexed microfluidic phage display (vol 12, pg 562, 2012)
SO LAB ON A CHIP
LA English
DT Correction
C1 [Slater, Russell L.; Cui, Yue; McAlpine, Michael C.] Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA.
[Cung, Kellye; Manivannan, Sriram; Nelson, Celeste M.] Princeton Univ, Dept Chem & Biol Engn, Princeton, NJ 08544 USA.
[Jones, Sharon E.; Naik, Rajesh R.] USAF, Mat & Mfg Directorate, Res Lab, Dayton, OH 45433 USA.
[Ahmad, Habib] CALTECH, Dept Chem, Pasadena, CA 91125 USA.
RP McAlpine, MC (reprint author), Princeton Univ, Dept Mech & Aerosp Engn, Princeton, NJ 08544 USA.
EM mcm@princeton.edu
NR 1
TC 1
Z9 1
U1 3
U2 10
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1473-0197
J9 LAB CHIP
JI Lab Chip
PY 2012
VL 12
IS 24
BP 5281
EP 5281
PG 1
WC Biochemical Research Methods; Chemistry, Multidisciplinary; Nanoscience
& Nanotechnology
SC Biochemistry & Molecular Biology; Chemistry; Science & Technology -
Other Topics
GA 049EJ
UT WOS:000311964700027
ER
PT J
AU Roy, JN
Luckarift, HR
Lau, C
Falase, A
Garcia, KE
Ista, LK
Chellamuthu, P
Ramasamy, RP
Gadhamshetty, V
Wanger, G
Gorby, YA
Nealson, KH
Bretschger, O
Johnson, GR
Atanassov, P
AF Roy, Jared N.
Luckarift, Heather R.
Lau, Carolin
Falase, Akinbayowa
Garcia, Kristen E.
Ista, Linnea K.
Chellamuthu, Privthiraj
Ramasamy, Ramaraja P.
Gadhamshetty, Venkataramana
Wanger, Greg
Gorby, Yuri A.
Nealson, Kenneth H.
Bretschger, Orianna
Johnson, Glenn R.
Atanassov, Plamen
TI A study of the flavin response by Shewanella cultures in carbon-limited
environments
SO RSC ADVANCES
LA English
DT Article
ID EXTRACELLULAR ELECTRON-TRANSFER; MICROBIAL FUEL-CELLS; OUTER-MEMBRANE
CYTOCHROMES; ONEIDENSIS MR-1; BACTERIAL NANOWIRES; RIBOFLAVIN; GROWTH;
ELECTRICITY; SHUTTLES; OXIDE
AB Mediated electron transfer has been implicated as a primary mechanism of extracellular electron transfer to insoluble electron acceptors in anaerobic cultures of the facultative anaerobe Shewanella oneidensis. In this work, planktonic and biofilm cultures of S. oneidensis exposed to carbon-limited environments trigger an electrochemical response thought to be the signature of an electrochemically active metabolite. This metabolite was detected via cyclic voltammetry for S. oneidensis MR-1 biofilms. The observed electrochemical potentials correspond to redox potentials of flavin-containing molecules. Chromatographic techniques were then used to quantify concentrations of riboflavin by the carbon-limited environmental response of planktonic S. oneidensis. Further evidence of flavin redox chemistry was associated with biofilm formation on multi-walled carbon nanotube-modified Toray paper under carbon-starved environments. By encapsulating one such electrode in silica, the encapsulated biofilm exhibits riboflavin redox activity earlier than a non-encapsulated system after media replacement. This work explores the electrochemical nature of riboflavin interaction with an electrode after secretion from S. oneidensis and in comparison to abiotic systems.
C1 [Roy, Jared N.; Lau, Carolin; Falase, Akinbayowa; Garcia, Kristen E.; Ista, Linnea K.; Atanassov, Plamen] Univ New Mexico, Dept Chem & Nucl Engn, Ctr Emerging Energy Technol, Albuquerque, NM 87131 USA.
[Luckarift, Heather R.; Ramasamy, Ramaraja P.; Gadhamshetty, Venkataramana; Johnson, Glenn R.] USAF, Airbase Sci Branch, Res Lab, Tyndall AFB, FL 32403 USA.
[Luckarift, Heather R.] Univ Technol Corp, Dayton, OH 45432 USA.
[Chellamuthu, Privthiraj; Nealson, Kenneth H.] Univ So Calif, Dept Earth Sci, Los Angeles, CA 90089 USA.
[Wanger, Greg; Gorby, Yuri A.; Nealson, Kenneth H.; Bretschger, Orianna] J Craig Venter Inst, San Diego, CA 92121 USA.
RP Roy, JN (reprint author), Univ New Mexico, Dept Chem & Nucl Engn, Ctr Emerging Energy Technol, Albuquerque, NM 87131 USA.
EM plamen@unm.edu
RI Atanassov, Plamen/G-4616-2011; Ista, Linnea/A-5029-2016
OI Ista, Linnea/0000-0002-8747-9987
FU Material Science Directorate of the U.S. Air Force Research Laboratory;
Air Force Office of Scientific Research; Oak Ridge Institute for Science
and Education
FX This study was funded by the Material Science Directorate of the U.S.
Air Force Research Laboratory and the Air Force Office of Scientific
Research. Venkataramana Gadhamshetty was supported through a
postdoctoral fellowship from Oak Ridge Institute for Science and
Education. Jared Roy was supported through a pre-doctoral fellowship
from Oak Ridge Institute for Science and Education.
NR 38
TC 10
Z9 10
U1 3
U2 63
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 2046-2069
J9 RSC ADV
JI RSC Adv.
PY 2012
VL 2
IS 26
BP 10020
EP 10027
DI 10.1039/c2ra21727a
PG 8
WC Chemistry, Multidisciplinary
SC Chemistry
GA 051OL
UT WOS:000312136800043
ER
PT J
AU Chen, L
Li, F
Ni, BB
Xu, J
Fu, ZP
Lu, YL
AF Chen, Long
Li, Feng
Ni, Binbin
Xu, Jiao
Fu, Zhengping
Lu, Yalin
TI Enhanced visible photocatalytic activity of hybrid Pt/alpha-Fe2O3
nanorods
SO RSC ADVANCES
LA English
DT Article
ID HYDROGEN EVOLUTION; FERMI-LEVEL; AU; OXIDATION; HEMATITE;
NANOSTRUCTURES; NANOPARTICLES; CATALYSTS; SIZE; NANOCRYSTALS
AB alpha-Fe2O3 nanorods with highly defective surfaces were used as a support to further synthesize hybrid Pt/alpha-Fe2O3 nanorods. Transmission electron microscopy analyses suggest that Pt nanoparticles are selectively deposited on the surface defects such as edge-steps. Pt nanoparticles in metallic and electron deficient states, as well as the correlation between chemisorbed oxygen species and the peripheral Pt area, were revealed by the X-ray photoelectron spectroscopy spectra. The hybrid nanorods with an optimized amount of Pt nanoparticles and a large peripheral Pt area exhibit far better visible light photocatalytic activity for degrading methylene blue than alpha-Fe2O3.
C1 [Chen, Long; Li, Feng; Ni, Binbin; Xu, Jiao; Fu, Zhengping; Lu, Yalin] Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China.
[Lu, Yalin] Natl Lab Phys Sci Microscale, Hefei 230026, Peoples R China.
[Lu, Yalin] USAF Acad, Laser Opt Res Ctr, Colorado Springs, CO 80840 USA.
RP Chen, L (reprint author), Univ Sci & Technol China, Dept Mat Sci & Engn, CAS Key Lab Mat Energy Convers, Hefei 230026, Peoples R China.
EM fuzp@ustc.edu.cn; yllu@ustc.edu.cn
RI fu, zhengping/A-3530-2009
OI fu, zhengping/0000-0002-7896-1333
FU National Basic Research Program of China [2012CB922000]; Fundamental
Research Funds for the central Universities; US Air Force Office of
Scientific of Research (AFOSR)
FX This work was supported by the National Basic Research Program of China
(2012CB922000) and the Fundamental Research Funds for the central
Universities. Prof. Lu also thanks the support from the US Air Force
Office of Scientific of Research (AFOSR).
NR 42
TC 17
Z9 17
U1 1
U2 34
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 2046-2069
J9 RSC ADV
JI RSC Adv.
PY 2012
VL 2
IS 26
BP 10057
EP 10063
DI 10.1039/c2ra21897f
PG 7
WC Chemistry, Multidisciplinary
SC Chemistry
GA 051OL
UT WOS:000312136800047
ER
PT B
AU Woodward, C
Asta, M
Trinkle, DR
Lill, J
AF Woodward, C.
Asta, M.
Trinkle, D. R.
Lill, J.
GP TMS
TI MOLECULAR-DYNAMICS SIMULATIONS OF NI-BASED SUPERALLOYS
SO TMS 2012 141ST ANNUAL MEETING & EXHIBITION - SUPPLEMENTAL PROCEEDINGS,
VOL 2: MATERIALS PROPERTIES, CHARACTERIZATION, AND MODELING
LA English
DT Proceedings Paper
CT Symposium on Materials Properties, Characterization and Modeling from
141st TMS Annual Meeting and Exhibition
CY MAR 11-15, 2012
CL Orlando, CA
SP TMS
DE Liquid metals; density; density functional theory; superalloys
ID PSEUDOPOTENTIALS
AB Fundamental properties of molten Ni-based alloys are calculated using ab initio molecular dynamics simulations based on Density Functional Theory. In this work predictions for density inversion, an increase in liquid metal density with increasing temperature, are made for a model Ni-Al-W alloy and the Ni-based superallloys RENE-N4 and CMSX-4. Previous calculations on simple, binary and ternary Ni alloys illustrated proof of concept of this method, predicting liquid-phase molar volumes (V(c, T)) within 0.6-1.8% of available experimental data. Simulation cells of 500 atoms, run for approximately 10 psec, were adequate to converge liquid metal densities and diffusion rates. Predicted liquid metal densities for Ni-Al-W alloys, for target compositions and temperatures consistent with 0 and 0.5 solid volume fractions in the melt, produce approximately a 2% density inversion. The liquid metal density for a Ni based superalloy, RENE-N4, is calculated at the liquidus and solidus temperatures expected in the mushy zone. A series of 500 atom instantiations of the superalloy melt produce self-consistent densities that are well within expected numerical error. This illustrates that simulations of moderate spatial and temporal scales sample enough degrees of freedom to properly represent the configuration entropy found in a liquid metal superalloy. Density inversions are predicted for both RENE-N4 and CMSX-4 for chemistries and temperatures consistent with 0 and 0.4 solid volume fractions in the melt.
C1 [Woodward, C.] USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Asta, M.] Univ Calif, Dept Mat Sci & Engn, Berkeley, CA 94720 USA.
[Trinkle, D. R.] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA.
[Lill, J.] High Performance Technol Inc, Wright Patterson AFB 45443, OH USA.
RP Woodward, C (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 9
TC 0
Z9 0
U1 0
U2 2
PU MINERALS, METALS & MATERIALS SOC
PI WARRENDALE
PA 184 THORN HILL RD, WARRENDALE, PA 15086-7514 USA
BN 978-1-118-35700-2; 978-1-118-29609-7
PY 2012
BP 325
EP 329
PG 5
WC Nanoscience & Nanotechnology; Metallurgy & Metallurgical Engineering
SC Science & Technology - Other Topics; Metallurgy & Metallurgical
Engineering
GA BCV71
UT WOS:000311607900042
ER
PT J
AU Blackshire, JL
AF Blackshire, James L.
GP IEEE
TI Microstructure-Induced Phonon Focusing Effects and Opportunities for
Improved Material Quantification
SO 2011 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)
LA English
DT Proceedings Paper
CT IEEE International Ultrasonics Symposium (IUS)
CY OCT 18-21, 2011
CL Orlando, FL
SP IEEE, PZFlex, Avago Technologies
DE Microstructure; Ultrasound Scattering; Phonon Focusing; Scanning Laser
Vibrometry
AB It is well known that single-crystal materials such as silicon have anisotropic elastic properties which depend on crystalline direction, causing the characteristic properties of a propagating elastic wave to have spatial and directional dependencies. As a result, variations in the speed and energy flux of an elastic waves propagating in a single crystal material typically produce spatial patterns, which can be used to infer the internal structure of a crystalline material. For polycrystalline materials, similar effects can be manifested when textured or single phase, equiaxed grains are involved, and coherent wave interference processes exist. Three examples of this are presented in this paper, where the propagation of longitudinal waves within single crystal silicon, textured titanium, and polycrystalline nickel materials are characterized using scanning laser vibrometry in a thru-transmission detection mode. By measuring and studying the resulting patterns, it is anticipated that inversion methods can be developed for the quantitative evaluation of single crystal and polycrystalline materials.
C1 USAF, Res Lab AFRL RXLP, Wright Patterson AFB, OH 45433 USA.
RP Blackshire, JL (reprint author), USAF, Res Lab AFRL RXLP, Wright Patterson AFB, OH 45433 USA.
EM James.Blackshire@wpafb.af.mil
NR 10
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4577-1252-4
PY 2012
BP 782
EP 785
DI 10.1109/ULTSYM.2011.0191
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCD91
UT WOS:000309918400189
ER
PT J
AU Blackshire, JL
AF Blackshire, James L.
GP IEEE
TI Three-dimensional Crack Depth Profile Assessment using Near-Field
Surface Acoustic Wave Signal Response
SO 2011 IEEE INTERNATIONAL ULTRASONICS SYMPOSIUM (IUS)
LA English
DT Proceedings Paper
CT IEEE International Ultrasonics Symposium (IUS)
CY OCT 18-21, 2011
CL Orlando, FL
SP IEEE, PZFlex, Avago Technologies
DE Surface Acoustic Wave; Crack Depth Profile; Near Field Scattering
ID BREAKING CRACK; ULTRASONIC SCATTERING; RAYLEIGH-WAVES
AB A method for determining the three-dimensional depth profile of a surface-breaking crack-like feature is presented based on near-field surface acoustic wave signal responses. Three-dimensional finite element models were used to study the forward problem, where the characteristic near-field scattering of a surface acoustic wave incident on a simulated crack was investigated. Experimental validation of the modeling predictions was accomplished using a wedge transducer for surface wave generation and a scanning laser vibrometry system for surface wave detection. The characteristic near-field amplitude response in reflection and in transmission was measured and modeled for flat-bottom, angled, and curved-bottom localized notch features, where a simple linear inversion method was developed, which provided an effective means for characterizing and mapping the three-dimensional depth profile of surface-breaking crack-like features with depths in the micron to millimeter range.
C1 USAF, Res Lab AFRL RXLP, Wright Patterson AFB, OH 45433 USA.
RP Blackshire, JL (reprint author), USAF, Res Lab AFRL RXLP, Wright Patterson AFB, OH 45433 USA.
EM James.Blackshire@wpafb.af.mil
NR 26
TC 0
Z9 0
U1 1
U2 6
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4577-1252-4
PY 2012
BP 1794
EP 1797
DI 10.1109/ULTSYM.2011.0448
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCD91
UT WOS:000309918400428
ER
PT J
AU Montgomery, KH
Wilt, DM
Howard, A
Williams, B
Williams, B
AF Montgomery, Kyle H.
Wilt, David M.
Howard, Alex
Williams, Bill, Sr.
Williams, Bill, Jr.
GP IEEE
TI Characterization of a TS-Space Quad-Source Solar Simulator
SO 2012 38TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
LA English
DT Proceedings Paper
CT 38th IEEE Photovoltaic Specialists Conference (PVSC)
CY JUN 03-08, 2012
CL Austin, TX
SP IEEE, IEEE Electron Devides Soc (EDS), IEEE Photon Soc, IEEE Power & Energy Soc (PES), HelioVolt Corp, SunShot, US Dept Energy
DE photovoltaic cells; light sources; current-voltage characteristics;
gallium compounds; indium gallium arsenide
AB We present a thorough evaluation of a first-of-its-kind quad-source AM 0 solar simulator developed by TS-Space Systems and installed at the AFRL Space Vehicles Directorate in Kirtland AFB, NM. With an underlying need to evaluate more complex and advanced space photovoltaics, the TS-Space Unisim 100 was chosen as replacement to the Spectrolab X-25. Several parameters of the Unisim were characterized including spectral irradiance, lamp stability (long-term and short-term), spatial uniformity, and repeatability. In addition, the impact of test plane translation due to variable cell holders was studied. The potential impact of AC input voltage to lamp ballast was also investigated. Further, comparisons are made to the X-25. Finally, operational considerations for the use of a multi-source simulator are discussed.
C1 [Montgomery, Kyle H.; Wilt, David M.; Howard, Alex] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Montgomery, Kyle H.] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47906 USA.
[Williams, Bill, Sr.; Williams, Bill, Jr.] TS Space Syst, Marlow, Bucks, England.
RP Montgomery, KH (reprint author), USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
NR 5
TC 2
Z9 2
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0066-7
PY 2012
BP 1517
EP 1522
PG 6
WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied
SC Energy & Fuels; Engineering; Physics
GA BCD90
UT WOS:000309917801178
ER
PT J
AU Smith, M
Tillotson, B
Oliver, J
Tarasenko, N
Schoelzel, T
Brandhorst, H
AF Smith, Marcus
Tillotson, Brian
Oliver, Jeffrey
Tarasenko, Nicholas
Schoelzel, Thomas
Brandhorst, Henry
GP IEEE
TI Development of a Laser Power Beaming Experiment
SO 2012 38TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
LA English
DT Proceedings Paper
CT 38th IEEE Photovoltaic Specialists Conference (PVSC)
CY JUN 03-08, 2012
CL Austin, TX
SP IEEE, IEEE Electron Devides Soc (EDS), IEEE Photon Soc, IEEE Power & Energy Soc (PES), HelioVolt Corp, SunShot, US Dept Energy
DE 810 nm laser; GaAs solar cells; power beaming; terrestrial test range
AB Because beaming power from a laser to solar cells is an option to meet increasing power demands of the DOD and elsewhere, a terrestrial power beaming experiment was conducted to uncover issues. The 2.5 kW laser beamed at 810 nm to utilize the atmospheric window at 800 to 890 nm. The 40 cell GaAs receiver array had four rows of cells connected in parallel each with ten cells in series. The test site is located at the Eglin Air Force Base, Florida and special test procedures to ensure participant safety were used. This paper describes the test equipment and laboratory and field power beaming results.
C1 [Smith, Marcus] USAF, Res Lab, Panama City, FL 32403 USA.
RP Smith, M (reprint author), USAF, Res Lab, Panama City, FL 32403 USA.
NR 1
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0066-7
PY 2012
BP 2825
EP 2830
PG 6
WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied
SC Energy & Fuels; Engineering; Physics
GA BCD90
UT WOS:000309917803028
ER
PT J
AU Howard, AD
Wilt, DM
Jenkins, PP
Trautz, KM
Hausgen, P
Merrill, JM
AF Howard, A. D.
Wilt, D. M.
Jenkins, P. P.
Trautz, K. M.
Hausgen, P.
Merrill, J. M.
GP IEEE
TI Selected On-Orbit Data from the FTSCE II aboard the MISSE 7 Testbed
SO 2012 38TH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE (PVSC)
LA English
DT Proceedings Paper
CT 38th IEEE Photovoltaic Specialists Conference (PVSC)
CY JUN 03-08, 2012
CL Austin, TX
SP IEEE, IEEE Electron Devides Soc (EDS), IEEE Photon Soc, IEEE Power & Energy Soc (PES), HelioVolt Corp, SunShot, US Dept Energy
DE advanced photovoltaics; high efficiency devices; inverted metamorphic;
space solar cells
AB The 2nd Forward Technology Solar Cell Experiment (FTSCE II) that flew as part of the 7th Materials on the International Space Station Experiments (MISSE 7) successfully flew on orbit for 18 months from 23 November 2009 to 20 May 2011. The Air Force Research Laboratory Space Vehicles Directorate in collaboration with the Naval Research Laboratory flew a myriad of experiments to evaluate advanced photovoltaic technologies. Such data is critical for technology development and future transition to operational use. Applications of the data include validating ground test protocols and assessing LEO environmental effects (atomic oxygen, ultraviolet radiation, thermal cycling, etc.). In addition to reducing risk to future spacecraft, research and development risks are reduced through early technology assessment for space operation. These experiments were comprised of triple-junction production as well as advanced inverted metamorphic (IMM) and other thin film III-V cells from multiple vendors. In addition to the III-V based devices an experiment was included to evaluate advanced amorphous silicon concepts. The methodology and analysis of the on-orbit data collected during the mission is presented here.
C1 [Howard, A. D.; Wilt, D. M.; Hausgen, P.; Merrill, J. M.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM USA.
RP Howard, AD (reprint author), USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM USA.
NR 5
TC 1
Z9 1
U1 2
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0066-7
PY 2012
BP 3275
EP 3280
PG 6
WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied
SC Energy & Fuels; Engineering; Physics
GA BCD90
UT WOS:000309917803124
ER
PT J
AU Bryan, CJ
Corso, KA
Corso, ML
Kanzler, KE
Ray-Sannerud, B
Morrow, CE
AF Bryan, Craig J.
Corso, Kent A.
Corso, Meghan L.
Kanzler, Kathryn E.
Ray-Sannerud, Bobbie
Morrow, Chad E.
TI Therapeutic Alliance and Change in Suicidal Ideation during Treatment in
Integrated Primary Care Settings
SO ARCHIVES OF SUICIDE RESEARCH
LA English
DT Article
DE outcomes; primary care; suicidal ideation; therapeutic alliance
ID OUTCOME CORRELATION; COGNITIVE THERAPY; PSYCHOTHERAPY; DEPRESSION;
DETERMINANTS
AB A strong therapeutic alliance is considered to be an essential factor for the effective assessment and management of suicidal patients; however, to date this has received little empirical attention. The current study evaluated the association of future change in suicidal ideation with therapeutic alliance during first appointments with primary care behavioral health consultants. The Behavioral Health Measure (BHM; Kopta & Lowery, 2002) and Therapeutic Bond Scale (TBS; CelestHealth Solutions, 2006) were completed by 497 primary care patients who kept 2 to 8 appointments with the integrated behavioral health consultant. Results indicated that suicidal ideation generally improved over the course of several behavioral health appointments and that therapeutic alliance was rated very high by patients. Therapeutic alliance during the first appointment was not associated with eventual change in suicidal ideation.
C1 [Bryan, Craig J.] Univ Utah, Natl Ctr Vet Studies, Salt Lake City, UT 84112 USA.
[Corso, Kent A.] NCR Behav Hlth LLC, Walter Reed Natl Mil, Med Ctr Bethesda, Bethesda, MD USA.
[Corso, Meghan L.] US PHS, Bur Med & Surg, Natl Naval Med Ctr, Bethesda, MD USA.
[Kanzler, Kathryn E.] Malcolm Grow Med Clin, Andrews AFB, MD USA.
[Morrow, Chad E.] Maxwell AFB, Montgomery, AL USA.
RP Bryan, CJ (reprint author), Univ Utah, Natl Ctr Vet Studies, 260 S Cent Campus Dr,Room 205, Salt Lake City, UT 84112 USA.
EM craig.bryan@psych.utah.edu
OI Bryan, Craig/0000-0002-9714-0733
NR 33
TC 5
Z9 5
U1 1
U2 7
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 1381-1118
J9 ARCH SUICIDE RES
JI Arch. Suicide Res.
PY 2012
VL 16
IS 4
BP 316
EP 323
DI 10.1080/13811118.2013.722055
PG 8
WC Psychiatry; Psychology; Psychology, Multidisciplinary
SC Psychiatry; Psychology
GA 035OT
UT WOS:000310957400004
PM 23137221
ER
PT J
AU Yom, J
Lane, SM
Vaia, RA
AF Yom, Jeannie
Lane, Sarah M.
Vaia, Richard A.
TI Multi-component hierarchically structured polymer brushes
SO SOFT MATTER
LA English
DT Article
ID TRANSFER RADICAL POLYMERIZATION; SURFACE-INITIATED POLYMERIZATIONS;
GRAFTING DENSITY; CONTROLLED GROWTH; MOLECULAR-WEIGHT; THIN-FILMS;
TEMPERATURE; FABRICATION; AFM; COPOLYMERS
AB Polymer brushes offer patternable, robust, two-dimensional coatings that can be used for, among other applications, the capture and release of medicine and nanoparticles. In this contribution, we demonstrate a technique for extending the patterning ability into the third dimension. This technique, which combines photolithography and ATRP, uses a photoresist to mask and expose chosen areas of a polymer brush. The polymer brush grows only in the exposed areas and subsequent masking and growth processes can be repeated owing to the living nature of ATRP, and thus allowing complex three-dimensional pattern formation. The concept is demonstrated by creating multi-component block-copolymer brush patterns of poly(2-hydroxyethyl methacrylate) (PHEMA), poly(N-isopropylacrylamide) (PNIPAM) and poly(glycidyl methacrylate) (PGMA). Colorimetric visualization of the swell-deswell transition of the partially hydrated and fully hydrated patterns confirm that PGMA patterned on top of PNIPAM alters swelling and the kinetics of the transition.
C1 [Yom, Jeannie; Lane, Sarah M.; Vaia, Richard A.] USAF, Nanostruct & Biol Mat Branch, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Vaia, RA (reprint author), USAF, Nanostruct & Biol Mat Branch, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM richard.vaia@wpafb.af.mil
FU Air Force Office for Scientific Research; Materials and Manufacturing
Directorate of the Air Force Research Laboratory; National Research
Council
FX Funding for this project was available from the Air Force Office for
Scientific Research and the Materials and Manufacturing Directorate of
the Air Force Research Laboratory. S. M. L. contributed to this article
while holding a National Research Council Research Associateship Award.
NR 45
TC 5
Z9 5
U1 2
U2 34
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1744-683X
J9 SOFT MATTER
JI Soft Matter
PY 2012
VL 8
IS 48
BP 12009
EP 12016
DI 10.1039/c2sm26277k
PG 8
WC Chemistry, Physical; Materials Science, Multidisciplinary; Physics,
Multidisciplinary; Polymer Science
SC Chemistry; Materials Science; Physics; Polymer Science
GA 044QV
UT WOS:000311638500007
ER
PT S
AU Hu, M
Li, H
Wu, Q
Rose, GS
AF Hu, Miao
Li, Hai
Wu, Qing
Rose, Garrett S.
GP IEEE
TI Hardware Realization of BSB Recall Function Using Memristor Crossbar
Arrays
SO 2012 49TH ACM/EDAC/IEEE DESIGN AUTOMATION CONFERENCE (DAC)
SE Design Automation Conference DAC
LA English
DT Proceedings Paper
CT 49th ACM/EDAC/IEEE Design Automation Conference (DAC)
CY JUN 03-07, 2012
CL San Francisco, CA
SP IEEE, ACM, EDAC
DE neural network; BSB model; memristor; crossbar array; process variation
ID MODEL
AB The Brain-State-in-a-Box (BSB) model is an auto-associative neural network that has been widely used in optical character recognition and image processing. Traditionally, the BSB model was realized at software level and carried out on high-performance computing clusters. To improve computation efficiency and reduce resources requirement, we propose a hardware realization by utilizing memristor crossbar arrays. In this work, we explore the potential of a memristor crossbar array as an auto-associative memory. More specificly, the recall function of a multi-answer character recognition based on BSB model was realized. The robustness of the proposed BSB circuit was analyzed and evaluated based on massive Monte-Carlo simulations, considering input defects, process variations, and electrical fluctuations. The physical constrains when implementing a neural network with memristor crossbar array have also been discussed. Our results show that the BSB circuit has a high tolerance to random noise. Comparably, the correlations between memristor arrays introduces directional noise and hence dominates the quality of circuits.
C1 [Hu, Miao; Li, Hai] NYU, Polytech Inst, Metrotech Ctr 6, New York, NY 10003 USA.
[Wu, Qing; Rose, Garrett S.] US Air Force, Res Lab, Rome, NY USA.
RP Hu, M (reprint author), NYU, Polytech Inst, Metrotech Ctr 6, New York, NY 10003 USA.
EM mhu01@students.poly.edu; hli@poly.edu; qing.wu@rl.af.mil;
garrett.rose@rl.af.mil
NR 18
TC 45
Z9 45
U1 2
U2 3
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0738-100X
BN 978-1-4503-1199-1
J9 DES AUT CON
PY 2012
BP 498
EP 503
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BBZ85
UT WOS:000309256800071
ER
PT S
AU Pino, RE
Li, H
Chen, YR
Hu, M
Liu, BY
AF Pino, Robinson E.
Li, Hai (Helen)
Chen, Yiran
Hu, Miao
Liu, Beiye
GP IEEE
TI Statistical Memristor Modeling and Case Study in Neuromorphic Computing
SO 2012 49TH ACM/EDAC/IEEE DESIGN AUTOMATION CONFERENCE (DAC)
SE Design Automation Conference DAC
LA English
DT Proceedings Paper
CT 49th ACM/EDAC/IEEE Design Automation Conference (DAC)
CY JUN 03-07, 2012
CL San Francisco, CA
SP IEEE, ACM, EDAC
DE Memristor; process variation; neural network; pattern recognition
ID INTRINSIC PARAMETER FLUCTUATIONS; MOSFETS
AB Memristor, the fourth passive circuit element, has attracted increased attention since it was rediscovered by HP Lab in 2008. Its distinctive characteristic to record the historic profile of the voltage/current creates a great potential for future neuromorphic computing system design. However, at the nano-scale, process variation control in the manufacturing of memristor devices is very difficult. The impact of process variations on a memristive system that relies on the continuous (analog) states of the memristors could be significant. We use TiO2-based memristor as an example to analyze the impact of geometry variations on the electrical properties. A simple algorithm was proposed to generate a large volume of geometry variation-aware three-dimensional device structures for Monte-Carlo simulations. A neuromorphic computing system based on memristor-based bidirectional synapse design is proposed as case study. We analyze and evaluate the robustness of the proposed system in pattern recognition based on massive Monte-Carlo simulations, after considering input defects and process variations.
C1 [Pino, Robinson E.] USAF, Res Lab, Griffiss AFB, NY 13441 USA.
[Li, Hai (Helen); Hu, Miao] Polytech Inst New York Univ, ECE Dept, Brooklyn, NY 11201 USA.
[Chen, Yiran; Liu, Beiye] Univ Pittsburgh, ECE Dept, Pittsburgh, PA 15260 USA.
RP Pino, RE (reprint author), USAF, Res Lab, Griffiss AFB, NY 13441 USA.
EM robinson.pino@rl.af.mil; hli@poly.edu; yic52@pitt.edu;
mhu01@students.poly.edu; bel34@pitt.edu
NR 19
TC 13
Z9 13
U1 0
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 0738-100X
BN 978-1-4503-1199-1
J9 DES AUT CON
PY 2012
BP 585
EP 590
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BBZ85
UT WOS:000309256800085
ER
PT J
AU Stanard, T
Flach, JM
Smith, MRH
Warren, R
AF Stanard, Terry
Flach, John M.
Smith, Matthew R. H.
Warren, Rik
TI Learning to Avoid Collisions: A Functional State Space Approach
SO ECOLOGICAL PSYCHOLOGY
LA English
DT Article
ID TIME-TO-COLLISION; VISUALLY GUIDED ACTION; INFORMATION-SOURCES; DYNAMIC
TOUCH; PERCEPTION; BRAKING; ARRIVAL; MOTION; TAU; CONSTRAINTS
AB Two experiments examined performance in collision avoidance situations. In both experiments participants were asked to initiate a discrete maneuver to avoid a collision at the last possible moment. The affordances of the situations were varied as a function of vehicle dynamics and the functional consequences associated with responding too late or too early. The results were examined in the context of a 2-dimensional functional state space with dimensions associated with optical angle and optical expansion rate. The patterns of performance showed that the actions were consistent with decision rules that could be specified in terms of linear functions of the two optical variables. In most cases, performance at early stages of learning suggested that people were using an Expansion Rate Criterion. With practice, people would tune to a decision rule that was appropriate for the specific vehicle dynamics tested. The results are discussed in relation to the role of three factors in shaping ultimate performance: (a) tasks constraints (i.e., affordances), (b) information constraints (i.e., optical structure), and (c) experience (i.e., learning).
C1 [Flach, John M.] Wright State Univ, Dept Psychol, Dayton, OH 45435 USA.
[Stanard, Terry; Warren, Rik] USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Smith, Matthew R. H.] Delphi Elect & Safety, Adv Engn, Kokomo, IN USA.
RP Flach, JM (reprint author), Wright State Univ, Dept Psychol, 3640 Colonel Glenn Highway, Dayton, OH 45435 USA.
EM john.flach@wright.edu
NR 59
TC 4
Z9 4
U1 1
U2 4
PU ROUTLEDGE JOURNALS, TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXFORDSHIRE, ENGLAND
SN 1040-7413
J9 ECOL PSYCHOL
JI Ecol. Psychol.
PY 2012
VL 24
IS 4
BP 328
EP 360
DI 10.1080/10407413.2012.729382
PG 33
WC Psychology, Experimental
SC Psychology
GA 037PL
UT WOS:000311118900004
ER
PT J
AU Shen, L
Hagen, JA
Papautsky, I
AF Shen, Li
Hagen, Joshua A.
Papautsky, Ian
TI Point-of-care colorimetric detection with a smartphone
SO LAB ON A CHIP
LA English
DT Article
ID IMAGE-ANALYSIS; PAPER; DEVICES; ELISA; TELEMEDICINE; PLATFORM; SCANNER
AB Paper-based immunoassays are becoming powerful and low-cost diagnostic tools, especially in resource-limited settings. Inexpensive methods for quantifying these assays have been shown using desktop scanners, which lack portability, and cameras, which suffer from the ever changing ambient light conditions. In this work, we introduce a novel approach of quantifying colors of colorimetric diagnostic assays with a smartphone that allows high accuracy measurements in a wide range of ambient conditions, making it a truly portable system. Instead of directly using the red, green, and blue (RGB) intensities of the color images taken by a smartphone camera, we use chromaticity values to construct calibration curves of analyte concentrations. We demonstrate the high accuracy of this approach in pH measurements with linear response ranges of 1-12. These results are comparable to those reported using a desktop scanner or silicon photodetectors. To make the approach adoptable under different lighting conditions, we developed a calibration technique to compensate for measurement errors due to variability in ambient light. This technique is applicable to a number of common light sources, such as sun light, fluorescent light, or smartphone LED light. Ultimately, the entire approach can be integrated in an "app" to enable one-click reading, making our smartphone based approach operable without any professional training or complex instrumentation.
C1 [Shen, Li; Papautsky, Ian] Univ Cincinnati, Sch Elect & Comp Syst, BioMicroSyst Lab, Cincinnati, OH 45221 USA.
[Hagen, Joshua A.] USAF, Res Lab, Dayton, OH 45433 USA.
RP Papautsky, I (reprint author), Univ Cincinnati, Sch Elect & Comp Syst, BioMicroSyst Lab, Cincinnati, OH 45221 USA.
EM ian.papautsky@uc.edu
FU Air Force Office of Scientific Research; Human Effectiveness
Directorate, 711 Human Performance Wing, Air Force Research Laboratory
FX This work was supported by funds provided by the Air Force Office of
Scientific Research and by the Human Effectiveness Directorate, 711
Human Performance Wing, Air Force Research Laboratory.
NR 32
TC 138
Z9 144
U1 14
U2 138
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1473-0197
EI 1473-0189
J9 LAB CHIP
JI Lab Chip
PY 2012
VL 12
IS 21
BP 4240
EP 4243
DI 10.1039/c2lc40741h
PG 4
WC Biochemical Research Methods; Chemistry, Multidisciplinary; Nanoscience
& Nanotechnology
SC Biochemistry & Molecular Biology; Chemistry; Science & Technology -
Other Topics
GA 035BF
UT WOS:000310916100005
PM 22996728
ER
PT S
AU Andersen, G
Asmolova, O
Dearborn, ME
McHarg, MG
AF Andersen, Geoff
Asmolova, Olha
Dearborn, Michael E.
McHarg, Matthew G.
BE Clampin, MC
Fazio, GG
MacEwen, HA
Oschmann, JM
TI FalconSAT-7: A Membrane Photon Sieve Cube Sat Solar Telescope
SO SPACE TELESCOPES AND INSTRUMENTATION 2012: OPTICAL, INFRARED, AND
MILLIMETER WAVE
SE Proceedings of SPIE
LA English
DT Proceedings Paper
CT Conference on Space Telescopes and Instrumentation - Optical, Infrared,
and Millimeter Wave
CY JUL 01-06, 2012
CL Amsterdam, NETHERLANDS
SP SPIE
DE Space telescopes; lightweight optics; diffractive optics
ID MODEL
AB We are currently constructing FalconSAT-7 for launch in mid-2014. The low-Earth, 3U Cube Sat solar telescope incorporates a 0.2m deployable membrane photon sieve with over 2.5 billion holes. The aim of the experiment is to demonstrate diffraction limited imaging of a collapsible, diffractive primary over a narrow bandwidth. As well as being simpler to manufacture and deploy than curved, polished surfaces, the sheets do not have to be optically flat, greatly reducing many engineering issues. As such, the technology is particularly promising as a means to achieve extremely large optical primaries from compact, lightweight packages.
C1 [Andersen, Geoff; Asmolova, Olha; Dearborn, Michael E.; McHarg, Matthew G.] USAF Acad, HQ USAFA DFP, Colorado Springs, CO 80840 USA.
RP Andersen, G (reprint author), USAF Acad, HQ USAFA DFP, 2354 Fairchild Dr,Ste 2A31, Colorado Springs, CO 80840 USA.
NR 7
TC 4
Z9 5
U1 1
U2 12
PU SPIE-INT SOC OPTICAL ENGINEERING
PI BELLINGHAM
PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98227-0010 USA
SN 0277-786X
BN 978-0-8194-9143-5
J9 PROC SPIE
PY 2012
VL 8442
AR 84421C
DI 10.1117/12.924250
PG 8
WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics
SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics
GA BCM09
UT WOS:000310691600040
ER
PT S
AU Carvalho, M
Granados, A
Perez, C
Arguedas, M
Muccio, M
Suprenant, J
Hague, D
Poland, B
AF Carvalho, Marco
Granados, Adrian
Perez, Carlos
Arguedas, Marco
Muccio, Michael
Suprenant, Joseph
Hague, Daniel
Poland, Brendon
BE Byrski, A
Oplatkova, Z
Carvalho, M
KisielDorohinicki, M
TI A Hybrid Emulation Environment for Airborne Wireless Networks
SO ADVANCES IN INTELLIGENT MODELLING AND SIMULATION: SIMULATION TOOLS AND
APPLICATIONS
SE Studies in Computational Intelligence
LA English
DT Article; Book Chapter
AB Airborne networks are among some of the most challenging communication environments for protocol design and validation. Three dimensional and highly dynamic in nature, airborne network links are generally difficult to simulate accurately and often expensive to recreate in field experiments. The physical characteristics of the data links in these kinds of networks are not only influenced by the usual environmental factors and interferences, but also by the frequent changes in the relative angles and positions between antennas, shadowing effects of the airframe, non-uniform ground effects and other factors. In this work we summarize our research for the development of mLab, a hybrid emulation environment for airborne networks that combines theoretical path loss models with statistical data-driven models to create a low-cost, high fidelity, specialized emulation environment for the development, evaluation, and validation of protocols and algorithms for airborne wireless networks.
C1 [Carvalho, Marco] Florida Inst Technol, Melbourne, FL 32901 USA.
[Carvalho, Marco] Inst Human & Machine Cognit, Ocala, FL 34471 USA.
[Granados, Adrian; Perez, Carlos; Arguedas, Marco] Florida Inst Human & Machine Cognit, Ocala, FL 34471 USA.
[Muccio, Michael; Suprenant, Joseph; Hague, Daniel; Poland, Brendon] USAF, Res Lab, Rome, NY USA.
RP Carvalho, M (reprint author), Florida Inst Technol, 150 W Univ Blvd, Melbourne, FL 32901 USA.
EM mcarvalho@fit.edu; agranados@ihmc.us; cperez@ihmc.us; marguedas@ihmc.us;
michael.muccio@ihmc.us; joseph.suprenant@ihmc.us;
daniel.hague@rl.af.mil; brendon.poland@rl.af.mil
OI Carvalho, Marco/0000-0002-2354-9640
NR 19
TC 0
Z9 0
U1 0
U2 0
PU SPRINGER-VERLAG BERLIN
PI BERLIN
PA HEIDELBERGER PLATZ 3, D-14197 BERLIN, GERMANY
SN 1860-949X
BN 978-3-642-28887-6
J9 STUD COMPUT INTELL
PY 2012
VL 416
BP 111
EP 129
D2 10.1007/978-3-642-28888-3
PG 19
WC Computer Science, Artificial Intelligence; Computer Science,
Interdisciplinary Applications
SC Computer Science
GA BCB20
UT WOS:000309564900005
ER
PT J
AU Hyde, MW
Havrilla, MJ
Bogle, AE
Rothwell, EJ
Dester, GD
AF Hyde, Milo W.
Havrilla, Michael J.
Bogle, Andrew E.
Rothwell, Edward J.
Dester, Gary D.
TI An Improved Two-Layer Method for Nondestructively Characterizing
Magnetic Sheet Materials Using a Single Rectangular Waveguide Probe
SO ELECTROMAGNETICS
LA English
DT Article
DE permittivity; permeability; waveguide probe; parallel-plate waveguide;
Green's function
ID ENDED COAXIAL PROBE; COMPLEX PERMITTIVITY; PERMEABILITY; FREQUENCIES;
REFLECTION; SPACE
AB An improved single waveguide probe technique is presented to nondestructively determine the permittivity and permeability of sheet materials. The impetus for the technique is to address the unreliable results yielded by the existing single probe two-layer method while preserving its physical ease of measurement. Included in this article is the theoretical development of the method and its experimental validation. The theoretical development uses Love's equivalence theorem to derive a magnetic field integral equation that is subsequently solved for the theoretical reflection coefficient using the method of moments. Experimental permittivity and permeability results for two magnetic shielding materials are presented and compared to results obtained using established techniques to validate the proposed method. Profile plots of the electric and magnetic fields in the material under test region of the measurement geometry are provided and analyzed to yield further physical insight.
C1 [Hyde, Milo W.; Havrilla, Michael J.; Bogle, Andrew E.] USAF, Inst Technol, Dept Elect & Comp Engn, Wright Patterson AFB, OH 45342 USA.
[Rothwell, Edward J.; Dester, Gary D.] Michigan State Univ, Dept Elect & Comp Engn, E Lansing, MI 48824 USA.
RP Hyde, MW (reprint author), USAF, Inst Technol, Dept Elect & Comp Engn, 2950 Hobson Way, Wright Patterson AFB, OH 45342 USA.
EM milo.hyde@afit.edu
NR 32
TC 6
Z9 6
U1 0
U2 2
PU TAYLOR & FRANCIS INC
PI PHILADELPHIA
PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA
SN 0272-6343
EI 1532-527X
J9 ELECTROMAGNETICS
JI Electromagnetics
PY 2012
VL 32
IS 7
BP 411
EP 425
DI 10.1080/02726343.2012.716702
PG 15
WC Engineering, Electrical & Electronic
SC Engineering
GA 030RW
UT WOS:000310588800004
ER
PT J
AU Henderson, WA
Fylstra, P
De Long, HC
Trulove, PC
Parsons, S
AF Henderson, Wesley A.
Fylstra, Paul
De Long, Hugh C.
Trulove, Paul C.
Parsons, Simon
TI Crystal structure of the ionic liquid EtNH3NO3-Insights into the thermal
phase behavior of protic ionic liquids
SO PHYSICAL CHEMISTRY CHEMICAL PHYSICS
LA English
DT Article
ID MOLECULAR-DYNAMICS SIMULATION; SOLID METHYLAMMONIUM BROMIDE;
ORDER-DISORDER TRANSITION; X-RAY-DIFFRACTION; MAGNETIC-RESONANCE;
ETHYLAMMONIUM NITRATE; INFRARED-SPECTRA; NEUTRON-DIFFRACTION; AMMONIUM
HALIDES; SELF-DIFFUSION
AB The crystal structure of the salt ethylammonium nitrate (EtNH3NO3) has been determined. EtNH3NO3 is one of the most widely studied protic ionic liquids (PILs)-ILs formed by proton transfer from a Bronsted acid to a Bronsted base. The structural features from the crystal structure, in concert with a Raman spectroscopic analysis of the ions, provide direct insight as to why EtNH3NO3 melts below ambient temperature, while other related salts (such as EtNH3Cl) do not.
C1 [Henderson, Wesley A.; Fylstra, Paul; Trulove, Paul C.] USN Acad, Dept Chem, Annapolis, MD 21402 USA.
[Henderson, Wesley A.] N Carolina State Univ, Dept Chem & Biomol Engn, Ion Liquids & Electrolyte Energy Technol ILEET La, Raleigh, NC 27695 USA.
[De Long, Hugh C.] USAF, Off Sci Res, Arlington, VA 22203 USA.
[Parsons, Simon] Univ Edinburgh, Sch Chem, Edinburgh EH9 3JJ, Midlothian, Scotland.
RP Henderson, WA (reprint author), USN Acad, Dept Chem, Annapolis, MD 21402 USA.
EM whender@ncsu.edu; hugh.delong@afosr.af.mil; trulove@usna.edu;
s.parsons@ed.ac.uk
FU U.S. Air Force Office of Scientific Research
FX The U.S. Air Force Office of Scientific Research is gratefully
acknowledged for funding portions of this work. Any opinions, findings
and conclusions or recommendations expressed in this material are those
of the authors and do not necessarily reflect the views of the U.S. Air
Force or Navy.
NR 61
TC 12
Z9 12
U1 1
U2 57
PU ROYAL SOC CHEMISTRY
PI CAMBRIDGE
PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS,
ENGLAND
SN 1463-9076
EI 1463-9084
J9 PHYS CHEM CHEM PHYS
JI Phys. Chem. Chem. Phys.
PY 2012
VL 14
IS 46
BP 16041
EP 16046
DI 10.1039/c2cp43079g
PG 6
WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical
SC Chemistry; Physics
GA 032SS
UT WOS:000310740000012
PM 23099473
ER
PT J
AU De, S
Gupta, K
Stanley, RJ
Zoughi, R
Doering, K
Van Aken, D
Steffes, G
O'Keefe, M
Palmer, D
AF De, Soumya
Gupta, Kapil
Stanley, R. Joe
Zoughi, Reza
Doering, Kenneth
Van Aken, David
Steffes, Gary
O'Keefe, Matt
Palmer, Donald
TI A COMPREHENSIVE STRUCTURAL ANALYSIS PROCESS FOR FAILURE ASSESSMENT IN
AIRCRAFT LAP-JOINT MIMICS USING INTRAMODAL FUSION OF EDDY CURRENT DATA
SO RESEARCH IN NONDESTRUCTIVE EVALUATION
LA English
DT Article
DE aging aircraft; aircraft lap-joints; data fusion; Eddy current testing;
fatigue; finite element modeling; nondestructive evaluation; structural
health monitoring (SHM)
ID MULTIFREQUENCY DATA FUSION; NDT DATA FUSION; CORROSION; FATIGUE
AB In the aerospace industry, nondestructive evaluation (NDE) techniques are commonly used for structural health monitoring, including finding manufacturing and service-induced discontinuities and defects such as corrosion and cracks. A comprehensive structural analysis process is presented for quantizing and evaluating characteristics of aircraft lap-joint mimics. The process investigated here consists of NDE data acquisition, defect detection and characterization involving material loss estimation, three-dimensional structural model generation, finite-element modeling to simulate fatigue damage and comparison with actual tensile fatigue-induced structural analysis data (mechanical loading). The structural analysis process is examined using five test panels consisting of stacked and riveted aluminum plates, configured as lap-joints, four of them with different corroded patches at different layers of the lap-joints and one painted pristine panel used as a reference. The test panels were subjected to three rounds of incremental and cyclical tensile fatiguing with the final round resulting in complete fatigue failure. Eddy current data was obtained from the test panels prior to each round of mechanical loading. Comparing the simulated fatigue loading and the mechanical loading results for identifying susceptible-to-failure areas on the test panels, this comprehensive structural analysis process found the correct location of failure areas at rates as high as 88.9%.
C1 [De, Soumya; Stanley, R. Joe; Zoughi, Reza] Missouri Univ Sci & Technol S&T, Dept Elect & Comp Engn, Rolla, MO USA.
[Gupta, Kapil] Coherix Inc, Ann Arbor, MI USA.
[Doering, Kenneth; Van Aken, David; O'Keefe, Matt] Missouri Univ Sci & Technol S&T, Dept Mat Sci & Engn, Rolla, MO USA.
[Steffes, Gary] USAF, Res Lab AFRL, Wright Patterson AFB, OH USA.
[Palmer, Donald] Boeing Co, Boeing Phantom Works, St Louis, MO USA.
RP Stanley, RJ (reprint author), Missouri Univ Sci & Technol, Dept Elect & Comp Engn, 127 Emerson Elect Co Hall,301 W 16th St, Rolla, MO 65409 USA.
EM stanleyj@mst.edu
FU Air Force Research Laboratory (AFRL) [FA8650-04-C-5704]; Center for
Aerospace Manufacturing Technologies (CAMT)
FX This work was supported in part by the Air Force Research Laboratory
(AFRL) under contract number FA8650-04-C-5704 in conjunction with the
Center for Aerospace Manufacturing Technologies (CAMT).
NR 22
TC 2
Z9 2
U1 2
U2 11
PU TAYLOR & FRANCIS INC
PI PHILADELPHIA
PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA
SN 0934-9847
EI 1432-2110
J9 RES NONDESTRUCT EVAL
JI Res. Nondestruct. Eval.
PY 2012
VL 23
IS 3
BP 146
EP 170
DI 10.1080/09349847.2012.660242
PG 25
WC Materials Science, Characterization & Testing
SC Materials Science
GA 030YM
UT WOS:000310606000002
ER
PT S
AU Krishnan, B
Thirumalai, RVKG
Kotamraju, S
Merrett, JN
Koshka, Y
AF Krishnan, Bharat
Thirumalai, Rooban Venkatesh K. G.
Kotamraju, Siva
Merrett, J. Neil
Koshka, Yaroslav
BE Devaty, RP
Dudley, M
Chow, TP
Neudeck, PG
TI Use of Vanadium Doping for Compensated and Semi-Insulating SiC Epitaxial
Layers for SiC Device Applications
SO SILICON CARBIDE AND RELATED MATERIALS 2011, PTS 1 AND 2
SE Materials Science Forum
LA English
DT Proceedings Paper
CT 14th International Conference on Silicon Carbide and Related Materials
(ICSCRM 2011)
CY SEP 11-16, 2011
CL Cleveland, OH
SP Cree, Keithley Instruments, AIXTRON, Dow Corn Elect Solut, Gen Elect, CuttingEdgeIons com, Off Naval Res Global, NASA Glenn Res Ctr, Infineon, SemiSouth, Microsemi, OAI
DE semi-insulating; epitaxial growth; chloro-carbon; PiN; drift region
ID GROWTH; CARBON
AB Vanadium doping from SiCl4 source during epitaxial growth with chlorinated C and Si precursors was investigated as a mean of achieving compensated and semi-insulating epitaxial 4H-SiC layers for device applications. Thin epilayers were grown at 1450 degrees C with a growth rate of similar to 6 mu m/h. Experiments at 1600 degrees C resulted in the growth rates ranging from 60 to 90 mu m/h producing epilayers with thickness above 30 mu m. V concentrations up to about 10(17)cm(-3) were found safe for achieving defect-free epilayer surface morphology, however certain degradation of the crystalline quality was detected by XRD at V concentrations as low as 3-5x10(15) cm(-3). Controllable compensation of nitrogen donors with V acceptors provided low-doped and semi-insulating epitaxial layers. Mesa isolated PiN diodes with V-acceptor-compensated epilayers used as drift regions showed qualitatively normal forward- and reverse-bias behavior.
C1 [Krishnan, Bharat; Thirumalai, Rooban Venkatesh K. G.; Kotamraju, Siva; Koshka, Yaroslav] Mississippi State Univ, Dept Elect & Comp Engn, Mississippi State, MS 39762 USA.
[Merrett, J. Neil] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Koshka, Y (reprint author), Mississippi State Univ, Dept Elect & Comp Engn, Mississippi State, MS 39762 USA.
EM bharat.kris@gmail.com; rk219@msstate.edu; sivakotam@gmail.com;
joseph.merrett@wpafb.af.mil; ykoshka@ece.msstate.edu
FU NASA EPSCoR [10-09-021]
FX The authors are grateful to Dr. Murugesu Yoganathan for the independent
verification of the high resistivity in the SI epilayers using COREMA.
The work was partially supported by NASA EPSCoR Grant no. 10-09-021.
NR 12
TC 0
Z9 0
U1 1
U2 6
PU TRANS TECH PUBLICATIONS LTD
PI DURNTEN-ZURICH
PA KREUZSTRASSE 10, 8635 DURNTEN-ZURICH, SWITZERLAND
SN 0255-5476
BN 978-3-03785-419-8; 978-3-03813-833-4
J9 MATER SCI FORUM
PY 2012
VL 717-720
BP 133
EP +
DI 10.4028/www.scientific.net/MSF.717-720.133
PG 2
WC Materials Science, Multidisciplinary
SC Materials Science
GA BCA44
UT WOS:000309431000031
ER
PT S
AU Sheridan, DC
Casady, JB
Autry, T
Aguirre, R
Lee, V
Johnson, RW
Palmer, MJ
Scofield, J
AF Sheridan, David C.
Casady, Jeffrey B.
Autry, Tracy
Aguirre, Rizal
Lee, Victor
Johnson, R. Wayne
Palmer, Michael J.
Scofield, James
BE Devaty, RP
Dudley, M
Chow, TP
Neudeck, PG
TI SiC JFET Power Modules for Reliable 250 degrees C Operation
SO SILICON CARBIDE AND RELATED MATERIALS 2011, PTS 1 AND 2
SE Materials Science Forum
LA English
DT Proceedings Paper
CT 14th International Conference on Silicon Carbide and Related Materials
(ICSCRM 2011)
CY SEP 11-16, 2011
CL Cleveland, OH
SP Cree, Keithley Instruments, AIXTRON, Dow Corn Elect Solut, Gen Elect, CuttingEdgeIons com, Off Naval Res Global, NASA Glenn Res Ctr, Infineon, SemiSouth, Microsemi, OAI
DE JFET; module; half-bridge; high-temperature; switching energy
AB An all SiC 600V / 6 m Omega hermetic half-bridge power module has been developed to operate at ambient temperatures of 200 degrees C and with junction temperatures near 250 degrees C. The modules use SiC trench JFET technology and can output over 100A at T-j=250 degrees C. Double pulsed switching was performed up to temperatures of 150 degrees C with a measured total switching energy of 0.73mJ. The final modules were subjected to temperature cycling, power cycling, and high temperature reverse bias (HTRB) reliability testing.
C1 [Sheridan, David C.; Casady, Jeffrey B.] SemiS Labs Inc, Starkville, MS 39759 USA.
[Autry, Tracy; Aguirre, Rizal; Lee, Victor] Microsemi Corp, Irvine, CA 92614 USA.
[Johnson, R. Wayne; Palmer, Michael J.] Auburn Univ, Auburn, AL 36849 USA.
[Scofield, James] Wright Patterson AFB, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Sheridan, DC (reprint author), SemiS Labs Inc, Starkville, MS 39759 USA.
EM david.sheridan@semisouth.com; jeff.casady@semisouth.com;
tautry@microsemi.com; johnsr7@auburn.edu
FU Air Force Research Laboratory [FA8650-07-C-2737]
FX This work was supported by the Air Force Research Laboratory through
contract FA8650-07-C-2737, monitored by Dr. James. D. Scofield.
NR 5
TC 2
Z9 2
U1 0
U2 1
PU TRANS TECH PUBLICATIONS LTD
PI DURNTEN-ZURICH
PA KREUZSTRASSE 10, 8635 DURNTEN-ZURICH, SWITZERLAND
SN 0255-5476
BN 978-3-03785-419-8; 978-3-03813-833-4
J9 MATER SCI FORUM
PY 2012
VL 717-720
BP 1229
EP +
DI 10.4028/www.scientific.net/MSF.717-720.1229
PG 2
WC Materials Science, Multidisciplinary
SC Materials Science
GA BCA44
UT WOS:000309431000294
ER
PT S
AU Thirumalai, RVKG
Krishnan, B
Levin, I
Davydov, AV
Sundaresan, S
Merrett, JN
Koshka, Y
AF Thirumalai, Rooban Venkatesh K. G.
Krishnan, Bharat
Levin, Igor
Davydov, Albert V.
Sundaresan, Siddarth
Merrett, J. Neil
Koshka, Yaroslav
BE Devaty, RP
Dudley, M
Chow, TP
Neudeck, PG
TI Growth of SiC Nanowires on Different Planes of 4H-SiC Substrates
SO SILICON CARBIDE AND RELATED MATERIALS 2011, PTS 1 AND 2
SE Materials Science Forum
LA English
DT Proceedings Paper
CT 14th International Conference on Silicon Carbide and Related Materials
(ICSCRM 2011)
CY SEP 11-16, 2011
CL Cleveland, OH
SP Cree, Keithley Instruments, AIXTRON, Dow Corn Elect Solut, Gen Elect, CuttingEdgeIons com, Off Naval Res Global, NASA Glenn Res Ctr, Infineon, SemiSouth, Microsemi, OAI
DE nanowires; epitaxial growth; CVD; chemical vapor deposition
ID SILICON-CARBIDE NANOWIRES
AB Growth of SiC nanowires (NWs) on monocrystalline 4H-SiC substrates was conducted to investigate a possibility of NW alignment and polytype control. The growth directions of the NWs on the top surfaces and the vertical sidewalls of 4H-SiC mesas having different crystallographic orientations were investigated. The majority of the NWs crystallize in the 3C polytype with the < 111 > growth axis. Six orientations of the 3C < 111 > NWs axis with respect to the substrate were obtained simultaneously when growing on the (0001) plane. In contrast, no more than two NW axis orientations coexisted when growing on a particular mesa sidewall. Growth on a particular {10-10} plane resulted in only one NW axis orientation, giving well-aligned NWs.
C1 [Thirumalai, Rooban Venkatesh K. G.; Krishnan, Bharat; Koshka, Yaroslav] Mississippi State Univ, Dept Elect & Comp Engn, Mississippi State, MS 39762 USA.
[Levin, Igor; Davydov, Albert V.] Natl Inst Stand & Technol, Gaithersburg, MD 20899 USA.
[Sundaresan, Siddarth] GeneSiC Semicond Inc, Dulles, VA 20166 USA.
[Merrett, J. Neil] US Air Force, Res Lab, Wright Patterson AFB, Wright Patterson AFB, OH 45433 USA.
RP Koshka, Y (reprint author), Mississippi State Univ, Dept Elect & Comp Engn, Mississippi State, MS 39762 USA.
EM rk219@msstate.edu; bharat.kris@gmail.com; igor.levin@nist.gov;
albert.davydov@nist.gov; sid@genesicsemi.com;
Joseph.Merrett@wpafb.af.mil; ykoshka@ece.msstate.edu
RI Davydov, Albert/F-7773-2010
OI Davydov, Albert/0000-0003-4512-2311
NR 19
TC 0
Z9 0
U1 0
U2 2
PU TRANS TECH PUBLICATIONS LTD
PI DURNTEN-ZURICH
PA KREUZSTRASSE 10, 8635 DURNTEN-ZURICH, SWITZERLAND
SN 0255-5476
BN 978-3-03785-419-8; 978-3-03813-833-4
J9 MATER SCI FORUM
PY 2012
VL 717-720
BP 1279
EP +
DI 10.4028/www.scientific.net/MSF.717-720.1279
PG 2
WC Materials Science, Multidisciplinary
SC Materials Science
GA BCA44
UT WOS:000309431000306
ER
PT S
AU Martin, M
Summers, J
Lyke, J
AF Martin, Maurice
Summers, Jeff
Lyke, James
GP IEEE
TI AFRL Plug-and-Play Spacecraft Avionics Experiment (SAE)
SO 2012 IEEE AEROSPACE CONFERENCE
SE IEEE Aerospace Conference Proceedings
LA English
DT Proceedings Paper
CT IEEE Aerospace Conference
CY MAR 03-10, 2012
CL Big Sky, MT
SP IEEE, AIAA, Phmsoc, AESS
DE Plug-and-play; satellite; avionics; modular; reconfigurable; (IC)-C-2;
SpaceWire; SPA; SAE; TacSat-3
AB The Air Force Research Laboratory (AFRL) developed an initial plug-and-play capability for spacecraft to better define interfaces, similar to USB on personal computers, in order to simplify spacecraft development and reduce cost and schedule. Much of this improved definition involves standardizing software interfaces between spacecraft components and a spacecraft network. The Spacecraft Avionics Experiment (SAE) was developed and flown as a secondary experiment on the AFRL TacSat-3 spacecraft as the first on-orbit demonstration of the Space Plug-and-Play Architecture (SPA) capability. On numerous occasions during SAE development and test, the modular, reconfigurable SPA interface provided significant cost and schedule savings. SAE consisted of a SPA-USB (SPA-U) network with multiple plug-and-play components with the objective of demonstrating as much core avionics and spacecraft operation as possible in a small secondary payload package. To this end, most elements of a Guidance, Navigation, and Control (GN&C) system were incorporated, to include a sun sensor, rate sensor, temperature sensors, and an AC coupled interconnect experiment. SAE also provided operational backups for TacSat-3 to include a Surrey SGR-05 GPS receiver and a backup high speed SPA-SpaceWire (SPA-S) link between the hyperspectral image processor and the C&DH for payload data transfer. Active GN&C control elements were not included so as not to risk spacecraft stability and control. SAE used built-in self test functions to verify on-orbit performance autonomously. The primary mission of TacSat-3 was to provide hyperspectral imaging data and to receive tasking, collect the data, and downlink to the tactical warfighter in a single flight over theater. TacSat-3 launched on 19 May 2009 and transitioned to the operational user on 12 June 2010. During TacSat-3 on-orbit experimental operations between these dates, SAE performed numerous experiment data collects. Both the SPA-U and SPA-S interfaces operated as designed. One of the SPA-U experiments had a SEU detector on board and no SEUs were observed during experiment operations. SPA-S demonstrated data transfers at 75 Mbps rate with no bit errors observed on orbit. SAE was developed for AFRL by the Space Systems Group at Sierra Nevada Corporation.
C1 [Martin, Maurice; Lyke, James] USAF, Res Lab, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
[Summers, Jeff] Sierra Nevada Corp, Louisville, KY 80027 USA.
RP Martin, M (reprint author), USAF, Res Lab, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM maurice.martin@kirtland.af.mil; jeff.summers@sncorp.com;
james.lyke@kirtland.af.mil
NR 4
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1095-323X
BN 978-1-4577-0557-1
J9 AEROSP CONF PROC
PY 2012
PG 6
WC Engineering, Aerospace
SC Engineering
GA BBZ12
UT WOS:000309105303006
ER
PT S
AU Qiu, D
Lynch, R
Blasch, E
Yang, C
AF Qiu, Di
Lynch, Robert
Blasch, Erik
Yang, Chun
GP IEEE
TI Underwater Navigation Using Location-Dependent Signatures
SO 2012 IEEE AEROSPACE CONFERENCE
SE IEEE Aerospace Conference Proceedings
LA English
DT Proceedings Paper
CT IEEE Aerospace Conference
CY MAR 03-10, 2012
CL Big Sky, MT
SP IEEE, AIAA, Phmsoc, AESS
DE underwater navigation; multisensor; location signature; geotag; control;
MUSNav
ID SIGNALS
AB This paper investigates the benefits of a multisensor fusion methodology for underwater navigation using location-dependent signatures, or geotags. The proposed coordinate-free system uses both natural and man-made signals, as well as transient events to extract location-dependent signatures for navigation and guidance. Natural signals include the geomagnetic field, gravity field, bathymetric features, and naturally-occurring very low frequency radio signals. Man-made acoustic sources of opportunity include drainage outlets and pump stations in littoral zones and particularly in harbors, which can be explored to serve as underwater beacons for navigation. This paper models a multisensor coordinate-free system, characterizes various signals for underwater navigation, and evaluates the Multisensor Underwater Signature-based Navigation (MUSNav) system in terms of accuracy, availability, and continuity of the navigation solution.
C1 [Qiu, Di; Yang, Chun] Sigtem Technol Inc, San Mateo, CA 94402 USA.
[Lynch, Robert] Naval Undersea Warfare Ctr, Newport, RI USA.
[Blasch, Erik] US Air Force, Res Lab, Wright Patterson AFB, OH USA.
RP Qiu, D (reprint author), Sigtem Technol Inc, San Mateo, CA 94402 USA.
EM diqiu@sigtem.com; robert.s.lynch@navy.mil; erik.blasch@wpafb.af.mil;
chunyang@sigtem.com
NR 19
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1095-323X
BN 978-1-4577-0557-1
J9 AEROSP CONF PROC
PY 2012
PG 9
WC Engineering, Aerospace
SC Engineering
GA BBZ12
UT WOS:000309105302015
ER
PT S
AU Steinbock, MJ
Schmidt, JD
Hyde, MW
AF Steinbock, Michael J.
Schmidt, Jason D.
Hyde, Milo W.
GP IEEE
TI Comparison of Branch Point Tolerant Wavefront Reconstructors in the
Presence of Simulated Noise Effects
SO 2012 IEEE AEROSPACE CONFERENCE
SE IEEE Aerospace Conference Proceedings
LA English
DT Proceedings Paper
CT IEEE Aerospace Conference
CY MAR 03-10, 2012
CL Big Sky, MT
SP IEEE, AIAA, Phmsoc, AESS
ID ADAPTIVE OPTICS
AB Branch points arise in optical transmissions due to strong atmospheric turbulence, long propagation paths, or a combination of both. Unfortunately, these conditions are very often present in desired operational scenarios for laser weapon systems, optical communication, and covert imaging, which suffer greatly when traditional adaptive optics systems either cannot sense branch points or implement non-optimal methods for sensing and correcting branch points. In this research we create a MATLAB simulation of the real-time AO system at the Air Force Institute of Technology. Utilizing a self-referencing interferometer as the high-order wavefront sensor-this type of sensor being theoretically immune to scintillation-this effort has extended previous theoretical work by adding realistic noise effects to the SRI's measurements before reconstructing the wavefronts and applying the control law. Previous research by Pellizzari presents a thorough analysis of various novel branch point tolerant reconstructors in the absence of noise. This study provides a foundation to guide hardware implementation in the future, where noise effects will be present.
C1 [Steinbock, Michael J.; Hyde, Milo W.] USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
[Schmidt, Jason D.] MZA Assoc Corp, Dayton, OH 45430 USA.
RP Steinbock, MJ (reprint author), USAF, Inst Technol, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
EM Michael.Steinbock@afit.edu; Jason.Schmidt@mza.com; Milo.Hyde@afit.edu
NR 17
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1095-323X
BN 978-1-4577-0557-1
J9 AEROSP CONF PROC
PY 2012
PG 13
WC Engineering, Aerospace
SC Engineering
GA BBZ12
UT WOS:000309105301086
ER
PT J
AU Henderson, R
McMasters, D
French, D
Clarke, T
AF Henderson, R.
McMasters, D.
French, D.
Clarke, T.
GP IEEE
TI Direct Power Injection of Microcontrollers in PCB Environments
SO 2012 INTERNATIONAL CONFERENCE ON ELECTROMAGNETICS IN ADVANCED
APPLICATIONS (ICEAA)
LA English
DT Proceedings Paper
CT International Conference on Electromagnetics in Advanced Applications
(ICEAA) / IEEE-APS Topical Conference on Antennas and Propagation in
Wireless Communications (IEEE APWC) / URSI Electromagnetic Environment
and Interference Symposium (EEIS)
CY SEP 02-07, 2012
CL Cape Town, SOUTH AFRICA
SP Univ Stellenbosch, Politecnico Torino, IEEE Antennas & Propagat, URSI, Int Union Radio Sci, Ist Superiore Mario Boella Tecnologie Informazione & Telecomunicazioni, Torino Wireless Fdn, COREP, FEKO, CST, Square Kilometre Array (SKA), Reutech Radar Syst
AB This paper presents results of target location specific direct injection on a 8051-based microcontroller in a development board versus a custom test board. Three target locations showed no failure in both environments. Using the custom board, an effect was found in a target location which was not observed using the development board.
C1 [Henderson, R.; McMasters, D.] UT Dallas, EE Dept, 800 W Campbell Rd,MS EC33, Richardson, TX 75080 USA.
[French, D.; Clarke, T.] Air Force Res Lab, Directed Energy Directorate, Kirtland AFB, NM 87117 USA.
RP Henderson, R (reprint author), UT Dallas, EE Dept, 800 W Campbell Rd,MS EC33, Richardson, TX 75080 USA.
EM rmhen@ieee.org; clarketj@ieee.org
FU Air Force Office of Scientific Research
FX The work described was supported in part by the Air Force Office of
Scientific Research.
NR 4
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0335-4
PY 2012
BP 1149
EP 1151
PG 3
WC Engineering, Electrical & Electronic
SC Engineering
GA BCJ98
UT WOS:000310356000217
ER
PT J
AU Wood, AW
AF Wood, Aihua W.
GP IEEE
TI Analysis and numerical solution of electromagnetic scattering from
cavities
SO 2012 INTERNATIONAL CONFERENCE ON ELECTROMAGNETICS IN ADVANCED
APPLICATIONS (ICEAA)
LA English
DT Proceedings Paper
CT International Conference on Electromagnetics in Advanced Applications
(ICEAA) / IEEE-APS Topical Conference on Antennas and Propagation in
Wireless Communications (IEEE APWC) / URSI Electromagnetic Environment
and Interference Symposium (EEIS)
CY SEP 02-07, 2012
CL Cape Town, SOUTH AFRICA
SP Univ Stellenbosch, Politecnico Torino, IEEE Antennas & Propagat Soc, URSI, Int Union Radio Sci, Ist Superiore Mario Boella Tecnologie Informazione & Telecomunicazioni, Torino Wireless Fdn, COREP, FEKO, CST, Square Kilometre Array (SKA), Reutech Radar Syst
AB In this paper, we survey the mathematical study of the phenomenon of electromagnetic scattering from cavities. We consider time harmonic and transient fields, PEC and Impedance boundary conditions, fully embedded and over-filled cavities.
C1 USAF, Dept Math & Stat, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Wood, AW (reprint author), USAF, Dept Math & Stat, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM aihua.wood@afit.edu
NR 1
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0335-4
PY 2012
BP 1253
EP 1255
PG 3
WC Engineering, Electrical & Electronic
SC Engineering
GA BCJ98
UT WOS:000310356000233
ER
PT J
AU Clarke, T
Dietz, D
French, D
AF Clarke, Timothy
Dietz, David
French, David
GP IEEE
TI Modeling of Radio-Frequency Effects on a Microcontroller
SO 2012 INTERNATIONAL CONFERENCE ON ELECTROMAGNETICS IN ADVANCED
APPLICATIONS (ICEAA)
LA English
DT Proceedings Paper
CT International Conference on Electromagnetics in Advanced Applications
(ICEAA) / IEEE-APS Topical Conference on Antennas and Propagation in
Wireless Communications (IEEE APWC) / URSI Electromagnetic Environment
and Interference Symposium (EEIS)
CY SEP 02-07, 2012
CL Cape Town, SOUTH AFRICA
SP Univ Stellenbosch, Politecnico Torino, IEEE Antennas & Propagat, URSI, Int Union Radio Sci, Ist Superiore Mario Boella Tecnologie Informazione & Telecomunicazioni, Torino Wireless Fdn, COREP, FEKO, CST, Square Kilometre Array (SKA), Reutech Radar Syst
AB The question of how a high-power RF pulse may affect a digital system such as a PC or an electronic control unit for a vehicle has become more important as sources of electromagnetic interference proliferate. The task of building a model for such an interaction is extremely challenging, requiring us to incorporate propagation and coupling of the electromagnetic fields, as well as circuit and system level effects. Rather than address this problem in its entirety, we choose to restrict our focus to a simpler system, specifically a microcontroller, and to RF waveforms directly injected into a set of signal lines. In this paper we will describe an integrated experimental and theoretical investigation of RF effects on n 8051-family microcontroller. We will describe our approach and present results from experimental investigations as well as a model for the probability of effect for an RF signal injected into signal lines carrying arbitrary logic pulse trains. Finally, we will describe how our results shed light on the broader problem of predicting the response of a general digital system to a high-power electromagnetic waveform.
C1 [Clarke, Timothy; French, David] USAF, Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
[Dietz, David] Univ New Mexico, Dept Elect & Comp Engn, Albuquerque, NM 87131 USA.
RP Clarke, T (reprint author), USAF, Res Lab, Directed Energy Directorate, 3550 Aberdeen Ave SE, Kirtland AFB, NM 87117 USA.
EM clarketj@ieee.org
FU Air Force Office of Scientific Research
FX The work described was supported in part by the Air Force Office of
Scientific Research.
NR 3
TC 0
Z9 0
U1 1
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0335-4
PY 2012
BP 1266
EP 1269
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCJ98
UT WOS:000310356000237
ER
PT S
AU Hu, M
Li, H
Wu, Q
Rose, GS
Chen, YR
AF Hu, Miao
Li, Hai (Helen)
Wu, Qing
Rose, Garrett S.
Chen, Yiran
GP IEEE
TI Memristor Crossbar Based Hardware Realization of BSB Recall Function
SO 2012 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS (IJCNN)
SE IEEE International Joint Conference on Neural Networks (IJCNN)
LA English
DT Proceedings Paper
CT International Joint Conference on Neural Networks (IJCNN)
CY JUN 10-15, 2012
CL Brisbane, AUSTRALIA
DE neural network; BSB model; memristor; crossbar array; process variation
ID NEURAL ASSOCIATIVE MEMORIES; DESIGN; MODEL
AB The Brain-State-in-a-Box (BSB) model is an auto-associative neural network that has been widely used in optical character recognition and image processing. Traditionally, the BSB model was realized at software level and carried out on high-performance computing clusters. To improve computation efficiency and reduce resource requirement, we propose a hardware realization by utilizing memristor crossbar arrays. Memristors can remember the historical profiles of the excitations and record them as analog variables. The similarity to biological synaptic behavior has encouraged a lot of research on memristor-based neuromorphic hardware system. In this work, we explore the potential of a memristor crossbar array as an auto-associative memory. More specifically, the recall function of a multi-answer character recognition based on BSB model was realized. The robustness of the proposed BSB circuit was analyzed and evaluated based on massive Monte-Carlo simulations, considering input defects, process variations, and electrical fluctuations. The physical constraints when implementing a neural network with memristor crossbar array have also been discussed. Our results show that the BSB circuit has a high tolerance to random noise. Comparably, the correlations between memristor arrays introduce directional noise and hence dominate the quality of the circuit.
C1 [Hu, Miao; Li, Hai (Helen)] NYU, Polytech Inst, Dept Elect & Comp Engn, Brooklyn, NY 11201 USA.
[Wu, Qing; Rose, Garrett S.] Air Force Res Lab, Informat Directorate, Griffiss AFB, NY 13441 USA.
[Chen, Yiran] Univ Pittsburgh, Dept Elect & Comp Engn, Pittsburgh, PA 15261 USA.
RP Hu, M (reprint author), NYU, Polytech Inst, Dept Elect & Comp Engn, Brooklyn, NY 11201 USA.
EM mhu01@students.poly.edu; hli@poly.edu; qing.wu@rl.af.mil;
garrett.rose@rl.af.mil; yic52@pitt.edu
FU AFRL [88ABW-2012-0192]
FX Received and approved for public release by AFRL on 01/10/2012, case
number 88ABW-2012-0192.
NR 20
TC 0
Z9 0
U1 1
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2161-4393
BN 978-1-4673-1490-9
J9 IEEE IJCNN
PY 2012
PG 7
WC Computer Science, Artificial Intelligence
SC Computer Science
GA BCA06
UT WOS:000309341301063
ER
PT S
AU Ilin, R
Kozma, R
AF Ilin, Roman
Kozma, Robert
GP IEEE
TI Cognitively Motivated Learning of Categorical Data with Modeling Fields
Theory
SO 2012 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS (IJCNN)
SE IEEE International Joint Conference on Neural Networks (IJCNN)
LA English
DT Proceedings Paper
CT International Joint Conference on Neural Networks (IJCNN)
CY JUN 10-15, 2012
CL Brisbane, AUSTRALIA
DE Bernoulli Mixture; Model Selection; MAP; Regularization; Dynamic Logic;
Vague-to-crisp; Neural Modeling Fields; Text Clustering
ID NEURAL-NETWORKS
AB a cognitively inspired framework referred to as Modeling Fields Theory (MFT) is utilized as the basic methodology for learning categorical data, represented by large binary vectors. The presented solution, referred to as accelerated MAP, allows simultaneous learning and selection of the number of models. The key element of accelerated MAP is a steady increase of the regularization penalty combined with gradual decrease of the model vagueness. The operation of this algorithm on real world data is illustrated by applying the algorithm to a text categorization problem. The relationship between the described algorithm and the vague-to-crisp process logic and the dynamical system approach to cognition are discussed.
C1 [Ilin, Roman] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Kozma, Robert] Univ Memphis, Dept Math, Memphis, TN 38152 USA.
RP Ilin, R (reprint author), USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM roman.ilin@wpafb.af.mil; rkozma@memphis.edu
RI Kozma, Robert/C-6365-2013
FU U.S. Air Force Office of Scientific Research
FX This work was supported by the U.S. Air Force Office of Scientific
Research
NR 30
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2161-4393
BN 978-1-4673-1490-9
J9 IEEE IJCNN
PY 2012
PG 8
WC Computer Science, Artificial Intelligence
SC Computer Science
GA BCA06
UT WOS:000309341300049
ER
PT S
AU Wang, H
Li, H
Pino, RE
AF Wang, Hui
Li, Hai (Helen)
Pino, Robinson E.
GP IEEE
TI Memristor-based Synapse Design and Training Scheme for Neuromorphic
Computing Architecture
SO 2012 INTERNATIONAL JOINT CONFERENCE ON NEURAL NETWORKS (IJCNN)
SE IEEE International Joint Conference on Neural Networks (IJCNN)
LA English
DT Proceedings Paper
CT International Joint Conference on Neural Networks (IJCNN)
CY JUN 10-15, 2012
CL Brisbane, AUSTRALIA
DE memristor; synapse; training
AB Memristors have been rediscovered recently and then gained increasing attentions. Their unique properties, such as high density, nonvolatility, and recording historic behavior of current (or voltage) profile, have inspired the creation of memristor-based neuromorphic computing architecture. Rather than the existing crossbar-based neuron network designs, we focus on memristor-based synapse and the corresponding training circuit to mimic the real biological system. In this paper, first, the basic synapse design is presented. On top of it, we will discuss the training sharing scheme and explore design implication on multi-synapse neuron system. Energy saving method such as self-training is also investigated.
C1 [Wang, Hui; Li, Hai (Helen)] NYU, Polytech Inst, Dept Elect & Comp Engn, Brooklyn, NY USA.
[Pino, Robinson E.] US Air Force, Res Lab, Informat Directorate Adv Comp Architecture, Rome, NY USA.
RP Wang, H (reprint author), NYU, Polytech Inst, Dept Elect & Comp Engn, Brooklyn, NY USA.
EM hwang07@students.poly.edu; hli@poly.edu; robinson.pino@rl.af.mil
FU AFRL [FA8750-11-2-0046]
FX Contractor acknowledges Government support in the publication of this
paper. This material is based upon work funded by AFRL under contract
No. FA8750-11-2-0046. Any opinions, findings and conclusions or
recommendations expressed in this material are those of the author(s)
and do not necessarily reflect the views of AFRL.
NR 12
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2161-4393
BN 978-1-4673-1490-9
J9 IEEE IJCNN
PY 2012
PG 5
WC Computer Science, Artificial Intelligence
SC Computer Science
GA BCA06
UT WOS:000309341301077
ER
PT J
AU Ash, JN
Meola, J
AF Ash, Joshua N.
Meola, Joseph
GP IEEE
TI INCORPORATING SPATIAL STRUCTURE INTO HYPERSPECTRAL SCENE ANALYSIS
SO 2012 IEEE STATISTICAL SIGNAL PROCESSING WORKSHOP (SSP)
LA English
DT Proceedings Paper
CT IEEE Statistical Signal Processing Workshop (SSP)
CY AUG 05-08, 2012
CL Ann Arbor, MI
SP IEEE
DE Hyperspectral imaging; Spatial correlation; Belief propagation
ID ANOMALY DETECTION; IMAGERY
AB In this paper we consider the problem of classifying materials in a scene based on hyperspectral measurements and a known spectral library of intrinsic material reflectances. In addition to sensor noise, estimation of material reflectances is complicated by atmospheric distortion and local shadowing effects in the scene. This paper proposes a robust Bayesian classifier based on belief propagation and the introduction of two sources of additional prior structure: 1) structured variation of atmospheric distortion, and 2) a spatial Markov structure for materials and shadows in the scene. An example demonstrates substantial reduction in pixel misclassification rate using the proposed method.
C1 [Ash, Joshua N.] Ohio State Univ, Dept Elect & Comp Eng, Columbus, OH 43210 USA.
[Meola, Joseph] US Air Force Res Lab, EO Target Detect & Surveillance Branch, Wright Patterson AFB, OH USA.
RP Ash, JN (reprint author), Ohio State Univ, Dept Elect & Comp Eng, Columbus, OH 43210 USA.
FU US Air Force Research Laboratorty
FX The work presented in this paper was funded by the US Air Force Research
Laboratorty
NR 7
TC 1
Z9 1
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0183-1
PY 2012
BP 5
EP 8
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCE18
UT WOS:000309943200002
ER
PT J
AU Buschelman, EA
Martin, RK
AF Buschelman, Eric A.
Martin, Richard K.
GP IEEE
TI NONPARAMETRIC METHODS FOR FULL-WAVEFORM LADAR IMAGES
SO 2012 IEEE STATISTICAL SIGNAL PROCESSING WORKSHOP (SSP)
LA English
DT Proceedings Paper
CT IEEE Statistical Signal Processing Workshop (SSP)
CY AUG 05-08, 2012
CL Ann Arbor, MI
SP IEEE
DE Ladar; waveform; nonparametrics; bootstrap
AB In the paper, the feasibility of using nonparametric methods to estimate the statistical distributions of full-waveform "Flash" laser radar (ladar) data is demonstrated. Unlike point cloud data, which consists solely of peak range and peak intensity information, full-waveform data captures the entire reflected ladar pulse, which enables more precise ranging and feature segmentation. A correlation-maximization waveform fitting technique yields unexpected values for certain parameters, due to energy loss from absorbent and non-diffuse reflecting surfaces.
C1 [Buschelman, Eric A.; Martin, Richard K.] USAF, Inst Technol, Grad Sch Engn & Management, Wright Patterson AFB, OH 45433 USA.
RP Buschelman, EA (reprint author), USAF, Inst Technol, Grad Sch Engn & Management, 2950 Hobson Way, Wright Patterson AFB, OH 45433 USA.
NR 6
TC 0
Z9 0
U1 1
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0183-1
PY 2012
BP 241
EP 244
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCE18
UT WOS:000309943200061
ER
PT J
AU Niu, RX
Huie, L
AF Niu, Ruixin
Huie, Lauren
GP IEEE
TI SYSTEM STATE ESTIMATION IN THE PRESENCE OF FALSE INFORMATION INJECTION
SO 2012 IEEE STATISTICAL SIGNAL PROCESSING WORKSHOP (SSP)
LA English
DT Proceedings Paper
CT IEEE Statistical Signal Processing Workshop (SSP)
CY AUG 05-08, 2012
CL Ann Arbor, MI
SP IEEE
DE Kalman filter; linear dynamic system; target tracking; false information
injection; bias
AB The problem of system state estimation in the presence of an adversary is investigated for linear dynamic systems. It is assumed that the adversary injects additive false information into the sensor measurement. The impact of the false information on the Kalman filter's estimation performance is analyzed for a general dynamic system. To be concrete, a target tracking system has been used as an example. In such a system, if the false information is injected only once, the effect of the false information on the Kalman filter proves to be diminishing over time, even when the Kalman filter is unaware of the false information injection. The convergence rate as a function of the maneuvering index is analyzed. If the false information is repeatedly injected into the system, the induced estimation error proves to reach a finite steady state. Numerical examples are presented to support the theoretical results.
C1 [Niu, Ruixin] Virginia Commonwealth Univ, Dept Elect & Comp Engn, Med Coll Virginia Campus, Richmond, VA 23284 USA.
[Huie, Lauren] Air Force Res Lab, Griffiss AFB, NY 13441 USA.
RP Niu, RX (reprint author), Virginia Commonwealth Univ, Dept Elect & Comp Engn, Med Coll Virginia Campus, Richmond, VA 23284 USA.
FU Air Force Research Laboratory Information Directorate
FX R. Nius work was supported by the Air Force Research Laboratory
Information Directorate through its Visiting Faculty Research Program in
2011
NR 6
TC 9
Z9 10
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0183-1
PY 2012
BP 385
EP 388
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCE18
UT WOS:000309943200097
ER
PT J
AU Martin, RK
AF Martin, Richard K.
GP IEEE
TI HOW VALID IS THE REGULARLY-SPACED GRID ASSUMPTION IN RSS SOURCE
LOCALIZATION SENSOR NETWORKS?
SO 2012 IEEE STATISTICAL SIGNAL PROCESSING WORKSHOP (SSP)
LA English
DT Proceedings Paper
CT IEEE Statistical Signal Processing Workshop (SSP)
CY AUG 05-08, 2012
CL Ann Arbor, MI
SP IEEE
DE Sensor networks; source localization; geolocation; received signal
strength
AB Received signal strength (RSS) based wireless sensor networks are often employed for position tracking. Sensor deployment is generally modeled as either a regular grid or as a random, uniform distribution for each sensor. This paper provides a theoretical comparison between the geolocation performance of a regular grid and a randomized grid. We show that the Cramer-Rao bounds are comparable, and for typical network parameters, realizations of the bound of the random grid are within a factor of 2 of the regular grid, with at least 75% confidence.
C1 USAF, Inst Technol, Dept Elec & Comp Eng, Wright Patterson AFB, OH 45433 USA.
RP Martin, RK (reprint author), USAF, Inst Technol, Dept Elec & Comp Eng, Wright Patterson AFB, OH 45433 USA.
EM richard.martin@afit.edu
NR 10
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0183-1
PY 2012
BP 520
EP 523
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCE18
UT WOS:000309943200131
ER
PT J
AU Drummy, LF
AF Drummy, Lawrence F.
GP IEEE
TI Bayesian Image Segmentation of Transmission Electron Tomography 3D
Reconstructions
SO 2012 IEEE STATISTICAL SIGNAL PROCESSING WORKSHOP (SSP)
LA English
DT Proceedings Paper
CT IEEE Statistical Signal Processing Workshop (SSP)
CY AUG 05-08, 2012
CL Ann Arbor, MI
SP IEEE
DE tomography; SIRT; segmentation; materials science; transmission electron
microscopy
AB The use of transmission electron tomography for three dimensional morphology analysis of nanostructured materials has grown significantly in recent years due to the improved robustness of automated image collection, alignment and reconstruction routines. Although the amount of published 3D electron tomography data has increased accordingly, in many cases the data is used purely for visualization purposes, due to the difficulty of making quantitative measurements from the as-reconstructed data. This is due to the traditionally difficult step of segmentation of the 3D image volume, which has been hindered due to noise, artifacts and lack of necessary image detail or sharpness. In this work the Simultaneous Iterative Reconstruction Technique (SIRT) is used to reconstruct High Angle Annular Dark Field-Scanning Transmission Electron Microscopy (HAADF-STEM) tomography data. The number of SIRT iterations is varied to optimize the reconstruction for segmentation. In particular, signal to noise ratio, signal to artifact ratio, and image blur are identified as parameters which each contribute to the suitability of the reconstruction for segmentation. The Expectation Maximization/Maximization of Posterior Marginals image segmentation algorithm is applied to the SIRT reconstructions, and the resulting Average Intensity Projection (AIP) of the segmented image stack is compared to the raw tomography projection data.
C1 USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Drummy, LF (reprint author), USAF, Mat & Mfg Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
NR 10
TC 1
Z9 1
U1 0
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0183-1
PY 2012
BP 676
EP 679
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCE18
UT WOS:000309943200170
ER
PT J
AU Venkatakrishnan, S
Drummy, L
Jackson, M
De Graef, M
Simmons, J
Bouman, C
AF Venkatakrishnan, Singanallur
Drummy, Lawrence
Jackson, Michael
De Graef, Marc
Simmons, Jeff
Bouman, Charles
GP IEEE
TI BAYESIAN TOMOGRAPHIC RECONSTRUCTION FOR HIGH ANGLE ANNULAR DARK FIELD
(HAADF) SCANNING TRANSMISSION ELECTRON MICROSCOP Y (STEM)
SO 2012 IEEE STATISTICAL SIGNAL PROCESSING WORKSHOP (SSP)
LA English
DT Proceedings Paper
CT IEEE Statistical Signal Processing Workshop (SSP)
CY AUG 05-08, 2012
CL Ann Arbor, MI
SP IEEE
DE Electron tomography; dark-field; Bayesian methods
AB HAADF-STEM data is increasingly being used in the physical sciences to study materials in 3D because it is free from the diffraction effects seen in Bright Field STEM data and satisfies the projection requirement for tomography. Typically, reconstruction is performed using Filtered Back Projection (FBP) or the SIRT algorithm. In this paper, we develop a Bayesian reconstruction algorithm for HAADF-STEM tomography which models the image formation, the noise characteristics of the measurement, and the inherent smoothness in the object. Reconstructions of polystyrene functionalized Titanium dioxide nano particle assemblies show results that are qualitatively superior to FBP and SIRT reconstructions, significantly suppressing artifacts and enhancing contrast.
C1 [Venkatakrishnan, Singanallur; Bouman, Charles] Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA.
[Drummy, Lawrence; Simmons, Jeff] Wright Patterson Air Force Base, Air Force Res Lab, Dayton, OH USA.
[Jackson, Michael] BlueQuartz Software, Springboro, OH USA.
[De Graef, Marc] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA.
RP Venkatakrishnan, S (reprint author), Purdue Univ, Sch Elect & Comp Engn, W Lafayette, IN 47907 USA.
NR 12
TC 3
Z9 3
U1 0
U2 6
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0183-1
PY 2012
BP 680
EP 683
PG 4
WC Engineering, Electrical & Electronic
SC Engineering
GA BCE18
UT WOS:000309943200171
ER
PT S
AU Shuman, NS
Miller, TM
Viggiano, AA
Troe, J
AF Shuman, Nicholas S.
Miller, Thomas M.
Viggiano, Albert A.
Troe, Juergen
BE Arimondo, E
Berman, PR
Lin, CC
TI Teaching an Old Dog New Tricks: Using the Flowing Afterglow to Measure
Kinetics of Electron Attachment to Radicals, Ion-Ion Mutual
Neutralization, and Electron Catalyzed Mutual Neutralization
SO ADVANCES IN ATOMIC, MOLECULAR, AND OPTICAL PHYSICS, VOL 61
SE Advances In Atomic Molecular and Optical Physics
LA English
DT Review; Book Chapter
ID R-MATRIX METHOD; REACTIONS INVOLVING HYDROGEN; UNIMOLECULAR BOND
FISSION; TUBE MASS-SPECTROMETRY; MOLECULE REACTIONS; RATE COEFFICIENTS;
LANGMUIR-PROBE; CROSS-SECTIONS; THERMAL-ENERGY; RECOMBINATION
COEFFICIENTS
AB Flowing tube apparatuses have been used to study a variety of electron and ion processes at thermal energies. We describe a new technique, variable electron and neutral density attachment mass spectrometry (VENDAMS), which has enabled measurement of rate coefficients for electron attachment to unstable radical molecules and other transient species and for mutual neutralization reactions of anions with noble gas cations, along with, in favorable cases, determination of neutral products of mutual neutralization. Additionally, the method has yielded evidence of a new ternary reaction in which an electron third body enhances anion-cation neutralization at high plasma densities.
C1 [Shuman, Nicholas S.; Miller, Thomas M.; Viggiano, Albert A.] USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
[Troe, Juergen] Univ Gottingen, Inst Phys Chem, D-37077 Gottingen, Germany.
[Troe, Juergen] Max Planck Inst Biophys Chem, D-37077 Gottingen, Germany.
RP Shuman, NS (reprint author), USAF, Res Lab, Space Vehicles Directorate, Kirtland AFB, NM 87117 USA.
NR 177
TC 26
Z9 26
U1 3
U2 21
PU ELSEVIER ACADEMIC PRESS INC
PI SAN DIEGO
PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA
SN 1049-250X
BN 978-0-12-396482-3
J9 ADV ATOM MOL OPT PHY
JI Adv. Atom. Mol. Opt. Phys.
PY 2012
VL 61
BP 209
EP 294
DI 10.1016/B978-0-12-396482-3.00005-3
PG 86
WC Optics; Physics, Atomic, Molecular & Chemical
SC Optics; Physics
GA BCD61
UT WOS:000309843000005
ER
PT S
AU Pettyjohn, EN
AF Pettyjohn, E. N.
BE Weisend, JG
Barclay, J
Breon, S
Demko, J
DiPirro, M
Kittel, P
Klebaner, A
Marquardt, J
Nellis, G
Peterson, T
Pfotenhauer, J
Rowe, A
VanSciver, S
Yuan, S
Zagarola, M
Zeller, A
TI FUTURE TRENDS OF AFRL CRYOCOOLER RESEARCH
SO ADVANCES IN CRYOGENIC ENGINEERING, VOLS 57A AND 57B
SE AIP Conference Proceedings
LA English
DT Proceedings Paper
CT Joint Conference on Transactions of the Cryogenic Engineering Conference
(CEC)/International Cryogenic Materials Conference (ICMC)
CY JUN 13-17, 2011
CL Spokane, WA
SP ATI Wah Chang, Burkert Fluid Control Syst, Cryocomp, Cryofab, Inc, Cryomagnet, Inc, Eden Cryogen, GE Global Res, Linde, Luvata Waterbury, Inc, Meyer Tool & Mfg, Inc, PHPK Technol, RUAG Space GmbH
DE air force; cryocooler; space
AB Over the past year, Air Force Research Labs (AFRL), Space Vehicles Directorate, has significantly defined the science and technology (S&T) path forward for cryocoolers in support of Air Force space missions. There are two trends that are emerging for cryocooler S&T: the first is missile warning and the second is responsive space. Missile warning is moving towards larger Focal Plane Arrays (FPAs), which generate large heat loads. Responsive space is moving towards a cheap, fast alternative to augment, or reconstitute space capabilities. At first glance, these two trends require completely different approaches to cryocooler S&T. However, decreasing the size, weight, and power of cryocoolers supports both trends. This paper will discuss the technology path chosen by AFRL to meet the Air Force (AF) mission needs for cryocoolers to include AFRL's research path, and potential Broad Agency Announcement (BAA) opportunities to help support the research goals.
C1 USAF, Res Labs, Albuquerque, NM 87117 USA.
RP Pettyjohn, EN (reprint author), USAF, Res Labs, Albuquerque, NM 87117 USA.
NR 11
TC 0
Z9 0
U1 0
U2 0
PU AMER INST PHYSICS
PI MELVILLE
PA 2 HUNTINGTON QUADRANGLE, STE 1NO1, MELVILLE, NY 11747-4501 USA
SN 0094-243X
BN 978-0-7354-1020-6
J9 AIP CONF PROC
PY 2012
VL 1434
BP 121
EP 128
DI 10.1063/1.4706912
PG 8
WC Physics, Applied
SC Physics
GA BBH76
UT WOS:000306860600012
ER
PT S
AU Rahy, A
Yang, KS
Bunker, C
Nadagouda, MN
Yang, DJ
AF Rahy, Abdelaziz
Yang, Kap Seung
Bunker, Christopher
Nadagouda, Mallikarjuna N.
Yang, Duck J.
BE Nadagouda, M
Connelly, M
Derin, B
Li, HP
Sekhar, JA
TI Immobilization of Iron Nanoparticles on Multi Substrates and Its
Reduction Removal of Chromium (VI) from Waste Streams
SO INNOVATION IN MATERIALS SCIENCE II
SE Key Engineering Materials
LA English
DT Article; Book Chapter
DE In-situ synthesis; iron nanoparticles; Substrates; Cr (VI) reduction
ID ZERO-VALENT IRON; TRICHLOROETHYLENE; REMEDIATION; DEGRADATION; GROWTH;
METAL
AB This article describes the in-situ synthesis and immobilization of iron nanoparticles on several substrates at room temperature using NaBH4 as a reducing agent and ascorbic acid as capping agent. The method is very effective in protecting iron nanoparticles from air oxidation for more than 30 days. Substrates used to immobilize iron nanoparticles are spherical polymer resins (size of 100-200 mesh) and novel carbon substrates prepared from high temperature carbonization of e-spun nylon and poly-acrylonitrile fabrics. Iron nanoparticles (40-100nm) immobilized sample showed higher activity for the reductive removal of hazardous hexavalent Cr (VI) compared to free floating iron nanoparticles at ambient temperature. Iron immobilized substrates has a great potential to be used not only for the removal of Cr (VI) in waste stream but also for oxygen scavenger for food packaging.
C1 [Nadagouda, Mallikarjuna N.] US EPA, ORD, NRMRL, WSWRD, Cincinnati, OH 45268 USA.
[Rahy, Abdelaziz; Yang, Duck J.] Univ Texas Dallas, Dept Chem, Richardson, TX 75083 USA.
[Rahy, Abdelaziz; Yang, Duck J.] Univ Texas Dallas, Alan G MacDiarmid NanoTech Res Inst, Richardson, TX 75083 USA.
[Yang, Kap Seung] Chonnam Natl Univ, Kwangju, South Korea.
[Bunker, Christopher] USAF, Res Lab, Dayton, OH 45433 USA.
RP Nadagouda, MN (reprint author), US EPA, ORD, NRMRL, WSWRD, 26 W MLK Dr, Cincinnati, OH 45268 USA.
EM Nadagouda.mallikarjuna@epa.gov; djyang@utdallas.edu
NR 23
TC 0
Z9 0
U1 0
U2 1
PU TRANS TECH PUBLICATIONS LTD
PI STAFA-ZURICH
PA LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND
SN 1013-9826
J9 KEY ENG MATER
PY 2012
VL 521
BP 153
EP 162
DI 10.4028/www.scientific.net/KEM.521.153
PG 10
WC Materials Science, Multidisciplinary
SC Materials Science
GA BCD79
UT WOS:000309891900010
ER
PT S
AU Rahy, A
Hong, SJ
Yang, KS
Bunker, C
Nadagouda, MN
Yang, DJ
AF Rahy, Abdelaziz
Hong, S. J.
Yang, Kap Seung
Bunker, Christopher
Nadagouda, Mallikarjuna N.
Yang, Duck J.
BE Nadagouda, M
Connelly, M
Derin, B
Li, HP
Sekhar, JA
TI Influence of Poly (Ethylene Glycol) and Oleylamine on the Formation of
Nano to Micron Size Spherical SiO2 Particles
SO INNOVATION IN MATERIALS SCIENCE II
SE Key Engineering Materials
LA English
DT Article; Book Chapter
DE spherical Sio2; oleylamine; polyethylene glycol; synthesis;
eco-friendly; nano-size; micron-size
ID SILICA NANOPARTICLES; MONODISPERSE; MICROEMULSION; NANOCRYSTALS; GROWTH;
PHOTOLUMINESCENCE; NANOSTRUCTURES; KINETICS; SPHERES
AB We report an eco-friendly synthesis of well-controlled, nano-to-micron-size, spherical SiO2 particles using non-hazardous solvent and a byproducts-producing system. It was found that the morphology and size of spherical SiO2 particles are controlled by adjusting the concentration of PEG and oleylamine, ethanol solvent selection, and reaction temperature. The SEM images show spherical-shaped silica particles with homogeneous particle-size distribution. Structural and optical properties of the silica particles were investigated by FT-IR absorption spectroscopy and photoluminescence. The resultant SiO2 particles from the synthesis system were easily dispersed in both water and organic solvent.
C1 [Nadagouda, Mallikarjuna N.] US EPA, ORD, NRMRL, WSWRD, Cincinnati, OH 45433 USA.
[Rahy, Abdelaziz; Yang, Duck J.] Univ Texas Dallas, Dept Chem, Richardson, TX 75083 USA.
[Rahy, Abdelaziz; Yang, Duck J.] Univ Texas Dallas, Alan G MacDiarmid NanoTech Res Inst, Richardson, TX 75083 USA.
[Hong, S. J.] Korea Elect Technol Inst, Songnam 463816, Gyeonggi Do, South Korea.
[Yang, Kap Seung] Chonnam Natl Univ, Kwangju, South Korea.
[Bunker, Christopher] USAF, Dayton, OH 45433 USA.
RP Nadagouda, MN (reprint author), US EPA, ORD, NRMRL, WSWRD, 26 W Martin Luther King Dr, Cincinnati, OH 45433 USA.
EM Nadagouda.mallikarjuna@epa.gov; djyang@utdallas.edu
NR 26
TC 0
Z9 0
U1 0
U2 3
PU TRANS TECH PUBLICATIONS LTD
PI STAFA-ZURICH
PA LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND
SN 1013-9826
J9 KEY ENG MATER
PY 2012
VL 521
BP 163
EP 169
DI 10.4028/www.scientific.net/KEM.521.163
PG 7
WC Materials Science, Multidisciplinary
SC Materials Science
GA BCD79
UT WOS:000309891900011
ER
PT J
AU Natarajan, LV
Cazzell, SA
Tondiglia, VP
Bunning, TJ
White, TJ
AF Natarajan, Lalgudi V.
Cazzell, Seth A.
Tondiglia, Vincent P.
Bunning, Timothy J.
White, Timothy J.
TI The role of crosslinking and polarity in the dark relaxation of
azobenzene-based, polymer-stabilised cholesteric liquid crystals
SO LIQUID CRYSTALS
LA English
DT Article
DE cholesteric liquid crystal; chiral nematic; azobenzene; photochemistry
ID CEPHALOPOD COLORATION MODEL; PHOTOCHROMIC FULGIDE; CHIRAL AZOBENZENES;
REVERSIBLE CONTROL; TWISTING POWER; PITCH; ISOMERIZATION; DERIVATIVES;
DOPANTS; PHASES
AB Prior examinations have reported that polymer stabilisation of azobenzene-based cholesteric liquid crystal (CLC) mixtures can reduce the time necessary for complete colour restoration in the dark from three days to as few as five minutes. This work extends upon these prior examinations by exploring and elucidating the role of crosslinker concentration and monomer polarity on the colour restoration of a representative CLC mixture composed of a high HTP bis(azo) binapthanyl chiral dopant (QL76) mixed into the cyanobiphenyl nematic liquid crystal host MDA-00-1444. The impact of these variables was unexpectedly convoluted. In all the formulations examined here, polymer stabilisation dramatically reduces the time for complete colour restoration of the starting reflection notch. In mixtures based on nonpolar liquid crystal monomers, increasing the crosslinker concentration reduces the time necessary for complete colour restoration. However, the dependence on crosslinker concentration reverses in mixtures composed from polar liquid crystal monomers in which increasing the crosslinker concentration serves to increase the time necessary for complete colour restoration.
C1 [Natarajan, Lalgudi V.; Cazzell, Seth A.; Tondiglia, Vincent P.; Bunning, Timothy J.; White, Timothy J.] USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
[Natarajan, Lalgudi V.; Tondiglia, Vincent P.] Sci Applicat Int Corp, Dayton, OH USA.
RP White, TJ (reprint author), USAF, Res Lab, Mat & Mfg Directorate, Wright Patterson AFB, OH 45433 USA.
EM timothy.white2@wpafb.af.mil
RI White, Timothy/D-4392-2012; Cazzell, Seth/J-4392-2015
OI Cazzell, Seth/0000-0001-6220-0436
FU Air Force Office of Scientific Research; Materials and Manufacturing
Directorate of the Air Force Research Laboratory
FX We gratefully acknowledge funding from the Air Force Office of
Scientific Research and the Materials and Manufacturing Directorate of
the Air Force Research Laboratory. We thank Quan Li for providing the
QL76 material used in this examination.
NR 52
TC 5
Z9 5
U1 1
U2 21
PU TAYLOR & FRANCIS LTD
PI ABINGDON
PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND
SN 0267-8292
J9 LIQ CRYST
JI Liq. Cryst.
PY 2012
VL 39
IS 12
BP 1450
EP 1457
DI 10.1080/02678292.2012.720290
PG 8
WC Chemistry, Multidisciplinary; Crystallography; Materials Science,
Multidisciplinary
SC Chemistry; Crystallography; Materials Science
GA 024UH
UT WOS:000310134000005
ER
PT J
AU Grupen, M
AF Grupen, Matt
GP IEEE
TI Scattering in GaAs for Fermi Kinetics Transport
SO 2012 15TH INTERNATIONAL WORKSHOP ON COMPUTATIONAL ELECTRONICS (IWCE)
LA English
DT Proceedings Paper
CT 15th International Workshop on Computational Electronics (IWCE)
CY MAY 22-25, 2012
CL Univ Wisconsin-Madison, Coll Engn, Madison, WI
SP NSF, Quantum Wise, Springer, IEEE, Electron Device Soc (EDS), APS Phys, Div Computat Phys
HO Univ Wisconsin-Madison, Coll Engn
AB Progress on a Fermi kinetics hot electron transport model, a numerically efficient approach based on ideal Fermi gas thermodynamics, is reported. The basics of the model are first reviewed, and then methods for incorporating ionized impurity, acoustic phonon, and long range electron-electron scattering are described. The different roles the various scattering mechanisms serve within the model and their effects on simulation results are also presented.
C1 USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Grupen, M (reprint author), USAF, Res Lab, 2241 Avion Circle, Wright Patterson AFB, OH 45433 USA.
EM Matthew.Grupen@wpafb.af.mil
NR 12
TC 0
Z9 0
U1 1
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
BN 978-1-4673-0705-5
PY 2012
PG 4
WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic
SC Computer Science; Engineering
GA BCC48
UT WOS:000309721800016
ER
PT S
AU Bales, MR
Benson, T
Dickerson, R
Campbell, D
Hersey, R
Culpepper, E
AF Bales, M. R.
Benson, T.
Dickerson, R.
Campbell, D.
Hersey, R.
Culpepper, E.
GP IEEE
TI Real-Time Implementations of Ordered-Statistic CFAR
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB Ordered-statistic constant false alarm rate (OS-CFAR) detectors provide improved robustness over cell-averaging CFAR (CA-CFAR) detectors in multiple target and heterogeneous clutter environments. However, this benefit comes at the cost of generally increased processing time due to the need for a rank-ordering of the CFAR training data. Real-time implementations of OS-CFAR must consider this additional processing burden.
In this paper, we present real-time FPGA and CPU/GPU implementations of OS-CFAR. A novel sorting architecture that scales linearly with window size is presented alongside traditional compare-and-swap and rank-only architectures in an FPGA. A rank-only GPU implementation is demonstrated alongside multi-threaded sorting and rank-only CPU implementations. Effects of training window size on throughput and power consumption are considered.
C1 [Bales, M. R.; Benson, T.; Dickerson, R.; Campbell, D.; Hersey, R.] Georgia Tech Res Inst, Sensors & Electromagnet Applicat Lab, Atlanta, GA 30332 USA.
[Culpepper, E.] US Air Force, Res Lab, Wright Patterson AFB, OH USA.
RP Bales, MR (reprint author), Georgia Tech Res Inst, Sensors & Electromagnet Applicat Lab, Atlanta, GA 30332 USA.
NR 10
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600164
ER
PT S
AU Ferrara, M
Arnold, G
Parker, JT
Stuff, M
AF Ferrara, Matthew
Arnold, Gregory
Parker, Jason T.
Stuff, Mark
GP IEEE
TI Robust Estimation of Shape Invariants
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
ID MOTION; TRACKING; TARGETS; SIGNALS
AB We develop a feature-based shape-and motion-estimation scheme for moving radar targets based on the solution of object-image relations (OIRs) for incomplete and noisy data. Unlike previous OIR-based techniques for the radar moving-target-imaging problem, our approach is robust to 1) missing data, 2) so-called "slippery scatterers" whose location moves with respect to the radar viewing aspect, and 3) extreme outliers (scattering centers that are inconsistent with the assumed physical or geometric models). The new method is based on exploiting the underlying structure of the model equations, that is, far-field radar data matrices can be decomposed into a summation of low-rank and sparse matrices.
C1 [Ferrara, Matthew; Arnold, Gregory] Matrix Res Inc, 1300 Res Pk Dr, Dayton, OH 45432 USA.
[Parker, Jason T.] US Air Force, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Stuff, Mark] Michigan Tech Res Inst, Ann Arbor, MI USA.
RP Ferrara, M (reprint author), Matrix Res Inc, 1300 Res Pk Dr, Dayton, OH 45432 USA.
EM matthew.ferrara@matrixresearch.com; greg.arnold@matrixresearch.com;
jason.parker@wpafb.af.mil; mastuff@mtri.edu
FU AFOSR
FX The authors were supported under an AFOSR lab task under the direction
of Dr. Arje Nachman. We would also like to thank Dr. Peter Stiller for
long-standing contributions to this work.
NR 22
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600031
ER
PT S
AU Fertig, LB
Baden, MJ
Kerce, JC
Sobota, D
AF Fertig, Louis B.
Baden, Michael J.
Kerce, J. Clayton
Sobota, David
GP IEEE
TI Localization and Tracking with Multipath Exploitation Radar
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
DE Multipath Exploitation Radar; Cramer-Rao Lower Bound; CRLB; GMTI; MER
AB This paper illustrates the exquisite localization and tracking performance that is obtainable in urban areas with Multipath Exploitation Radar (MER). First, the MER concept is described. Next, Cramer-Rao Lower Bounds of the desired localization and tracking quantities are derived and evaluated with representative parameters. Measured data is then used to demonstrate that this performance can be achieved in practice. Finally, ideas for future MER research are discussed.
C1 [Fertig, Louis B.; Baden, Michael J.; Kerce, J. Clayton] Georgia Tech Res Inst, Sensors & Electromagnet Applicat Lab, 7220 Richardson Rd, Smyrna, GA 30080 USA.
[Sobota, David] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Fertig, LB (reprint author), Georgia Tech Res Inst, Sensors & Electromagnet Applicat Lab, 7220 Richardson Rd, Smyrna, GA 30080 USA.
FU Air Force Research Laboratory (AFRL)
FX This effort was sponsored by the Air Force Research Laboratory (AFRL)
NR 7
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600186
ER
PT S
AU Frost, SW
Rigling, B
AF Frost, Shaun W.
Rigling, Brian
GP IEEE
TI Sidelobe Predictions for Spectrally-Disjoint Radar Waveforms
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB Spectrally-disjoint radar waveforms seek to minimize the amount of energy in a set of frequency bands within the bandwidth of the waveform. Such a waveform will suffer higher range sidelobes than a waveform with a contiguous bandwidth. As we continue to develop these waveforms, it becomes necessary to establish peak sidelobe level ratio (PSLR) and integrated sidelobe level ratio (ISLR) predictions in order to objectively evaluate performance. In this paper, we derive a closed-form prediction for PSLR and ISLR. These predictions provide sidelobe estimates as a function of usable bandwidth. Predictions such as these can aid in the decision making process of an adaptive radar.
C1 [Frost, Shaun W.] USAF, Res Labs, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Rigling, Brian] Wright State Univ, Dept Elect Engn, Dayton, OH 45435 USA.
RP Frost, SW (reprint author), USAF, Res Labs, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM shaun.frost@wpafb.af.mil; brian.rigling@wright.edu
NR 16
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600045
ER
PT S
AU Hou, SJ
Qiu, R
Browning, JP
Wicks, M
AF Hou, Shujie
Qiu, Robert
Browning, James P.
Wicks, Michael
GP IEEE
TI Target Detection with Linear and Kernel Subspaces Matching in the
Presence of Strong Clutter
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB This paper proposes potential approaches to detect the weak target in the presence of strong disturbance. The disturbance consists of strong clutter and white Gaussian noise. The target and clutter are assumed to lie in the corresponding subspaces. The algorithms of subspace matching in the linear and kernel subspaces are derived respectively. The leading eigenvector matching that is the subspace with rank one is investigated as well. The simulation is done for two sensor arrays based on the characteristics of the clutter environment. The results from the simulation show the potential and promising uses of the proposed algorithms to detect the weak target.
C1 [Hou, Shujie; Qiu, Robert] Tennessee Technol Univ, Cognit Radio Inst, Dept Elect & Comp Engn, Ctr Mfg Res, Cookeville, TN 38505 USA.
[Qiu, Robert] Tennessee Technol Univ, Cognit Radio Inst, Dept Elect & Comp Engn, Ctr Mfg Res, Cookeville, TN 38505 USA.
[Browning, James P.] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
[Wicks, Michael] Univ Dayton, Res Inst, Sensor Syst Div, Dayton, OH 45469 USA.
RP Hou, SJ (reprint author), Tennessee Technol Univ, Cognit Radio Inst, Dept Elect & Comp Engn, Ctr Mfg Res, Cookeville, TN 38505 USA.
EM shou42@students.tntech.edu; rqiu@tntech.edu;
James.Browning@wpafb.af.mil; Michael.Wicks@udri.udayton.edu
FU National Science Foundation [ECCS-0901420, ECCS-0821658]; Office of
Naval Research [N00010-10-1-0810, N00014-11-1-0006]
FX This work is funded by National Science Foundation, through two grants
(ECCS-0901420 and ECCS-0821658), and Office of Naval Research, through
two grants (N00010-10-1- 0810 and N00014-11-1-0006).
NR 14
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600067
ER
PT S
AU Hu, Z
Bryant, M
Qiu, RC
AF Hu, Z.
Bryant, Michael
Qiu, R. C.
GP IEEE
TI Multi-path SAR Change Detection
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
DE SAR; Change Detection; Robust PCA; Template Matching plus Thresholding
ID IMAGES
AB Synthetic aperture radar (SAR) is a form of imaging radar. The defining characteristic of SAR is the usage of relative motion between an antenna and its target region to provide long-term coherent-signal variations that can be exploited to obtain fine spatial resolution for radar image. Due to the improvement of SAR data acquisition technique and the flexibility of SAR sensor deployment, multi-pass SAR imageries can be easily obtained. More information and intelligence can be extracted from SAR imageries. This paper will address one challenging issue for SAR data fusion, i.e. multi-pass SAR change detection. Two methods are proposed in this paper to perform multi-pass SAR change detection. One method is based on robust principal component analysis (PCA) and the other method uses template matching plus thresholding. Both methods explore the local statistics to indicate the change of each pixel in the SAR imageries. The visualization performances illustrate the potential of these two methods for the issue of SAR change detection.
C1 [Hu, Z.; Qiu, R. C.] Tennessee Technol Univ, Cognit Radio Inst, Dept Elect & Comp Engn, Ctr Mfg Res, Cookeville, TN 38505 USA.
[Bryant, Michael] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Hu, Z (reprint author), Tennessee Technol Univ, Cognit Radio Inst, Dept Elect & Comp Engn, Ctr Mfg Res, Cookeville, TN 38505 USA.
EM zhu@tntech.edu; Michael.Bryant@wpafb.af.mil; rqiu@tntech.edu
FU National Science Foundation [ECCS-0901420, ECCS-0821658]; Office of
Naval Research [N00010-10-1-0810, N00014-11-1-0006]
FX This work is funded by National Science Foundation through two grants
(ECCS-0901420 and ECCS-0821658), and Office of Naval Research through
two grants (N00010-10-1-0810 and N00014-11-1-0006).
NR 19
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600157
ER
PT S
AU Ioana, C
Zhang, YD
Amin, MG
Ahmad, F
Frazer, G
Himed, B
AF Ioana, Cornel
Zhang, Yimin D.
Amin, Moeness G.
Ahmad, Fauzia
Frazer, Gordon
Himed, Braham
GP IEEE
TI Time-Frequency Characterization of Micro-Multipath Signals in
Over-the-Horizon Radar
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB A challenging task in over-the-horizon radar (OTHR) is the tracking of target altitude. It has been shown that the micro-multipaths due to ocean/ground reflections may reveal important information about the elevation maneuvering of a target. The Doppler signature of such micro-multipath signals is typically composed of three components having close nonlinear time-frequency behaviors. In this paper, we develop novel time-frequency analysis techniques for the characterization of Doppler effect of micro-multipath signals. The proposed method is based on the local analysis of the signal phase, followed by a stationarization operator. In the warped representation domain, the multi-component nonlinear Doppler signatures become stationary, thus allowing the application of spectral analysis tools. The results presented are based on real data and illustrate the potential of the proposed methods.
C1 [Ioana, Cornel] Grenoble Inst Technol, GIPSA Lab, Signal Image Dept, St Martin Dheres, France.
[Zhang, Yimin D.; Amin, Moeness G.; Ahmad, Fauzia] Villanova Univ, Ctr Adv Commun, Villanova, PA 19085 USA.
[Frazer, Gordon] Defence Sci & Technol Org, Intelligence Surveillance & Reconnaissance Div, Sydney, NSW, Australia.
[Himed, Braham] AFRL, Dayton, OH 4543 USA.
RP Ioana, C (reprint author), Grenoble Inst Technol, GIPSA Lab, Signal Image Dept, St Martin Dheres, France.
FU Dynetics,Inc.; Air Force Research Laboratory (AFRL) [FA8650-08-D-1303]
FX The work of Y.D.Zhang,M.G.Amin,and F.Ahmad is supported in part by a
subcontract with Dynetics,Inc.for research sponsored by the Air Force
Research Laboratory (AFRL) under Contract FA8650-08-D-1303.
NR 5
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600123
ER
PT S
AU Jones, AM
Rigling, BD
AF Jones, Aaron M.
Rigling, Brian D.
GP IEEE
TI Planar Frequency Diverse Array Receiver Architecture
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB In this paper, we extend the beamforming theory for frequency diverse arrays (FDA) to planar array geometries and give spatial pattern snapshots from the transmit and receive aspects. This is a natural extension of linear FDA work. Prior to this paper, FDA has only been discussed as either a linear array on transmit or with a receive processing chain that excludes some transmitted signals. We propose a technique that allows all transmitted signals to be seen and processed by each element on receive in a monostatic configuration.
C1 [Jones, Aaron M.] USAF, RF Exploitat Technol Branch, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Rigling, Brian D.] Wright State Univ, Dept Elect Engn, Dayton, OH 45435 USA.
RP Jones, AM (reprint author), USAF, RF Exploitat Technol Branch, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM aaron.jones.1@wpafb.af.mil; brian.rigling@wright.edu
FU Air Force Office of Scientific Research [2311]
FX The authors would like to thank the Air Force Office of Scientific
Research for support. This work completed by funding under project
#2311. We would also like to thank Mr. Douglas Glass for assisting in
the MATLAB visualization technique development.
NR 7
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600027
ER
PT S
AU Li, KY
Uysal, F
Pillai, SU
Moore, LJ
AF Li, Ke Yong
Uysal, Faruk
Pillai, S. Unnikrishna
Moore, Linda J.
GP IEEE
TI Modified Space-Time Adaptive Processing for Dismount Detection using
Synthetic Aperture Radar
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB This paper presents a new adaptive radar signal processing technique for dismount detection using Synthetic Aperture Radar (SAR). The new approach uses the complex nature of the Doppler response scattering from the dismounts rotary motion to modify the conventional Space-Time Adaptive Processing (STAP). This is used for dismount detection wherein resolution is dictated by the sensor system platform. The feasibility of the modified STAP (M-STAP) is demonstrated by simulations and by applying it to the Gotcha data set for dismount detection.
C1 [Li, Ke Yong; Uysal, Faruk; Pillai, S. Unnikrishna] C&P Technol Inc, Closter, NJ 07096 USA.
[Pillai, S. Unnikrishna] Polytech Inst NYU, Brooklyn, NY USA.
[Moore, Linda J.] AFRL, Sensor Directorate, WPAFB, Wright Patterson AFB, OH USA.
RP Li, KY (reprint author), C&P Technol Inc, Closter, NJ 07096 USA.
EM kli@cptnj.com; faruk@cptnj.com; linda.moore2@wpafb.af.mil
FU Air Force Research Laboratory (AFRL) Sensors Directorate under SBIR
[FA8650-11-M-1127]
FX The work described here was supported by the Air Force Research
Laboratory (AFRL) Sensors Directorate under SBIR Contract
FA8650-11-M-1127. (Approved for Public Release, Distribution Unlimited.
Public Release Number: 88 ABW-12-1076)
NR 11
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600022
ER
PT S
AU Lo Monte, L
Parker, JT
Vela, R
Baker, CJ
AF Lo Monte, Lorenzo
Parker, Jason T.
Vela, Russell
Baker, Christopher J.
GP IEEE
TI A Calibration Procedure for Ground-Based RF Tomography
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB Ground-based RF Tomography requires accurate calibration to ensure that acceptable image quality is achieved. A calibration scheme that exploits the direct path between any transmitter and receiver pair was presented in [1], valid only when radiators are approximated as Hertzian dipoles. In this work, a generalized calibration procedure that is valid for most antennas is presented. The calibration is achieved by placing a known target slightly outside the area under observation. The known target can be of any shape, as long as numerical/analytical EM predictions are available. Preliminary experimental results are presented.
C1 [Lo Monte, Lorenzo] Gen Dynam Informat Technol, Wright Patterson AFB, OH USA.
[Parker, Jason T.] Air Force Res Lab, Wright Patterson AFB, OH USA.
[Vela, Russell] Univ Dayton, Inst Res, Dayton, OH USA.
[Baker, Christopher J.] Ohio State Univ, Columbus, OH USA.
RP Lo Monte, L (reprint author), Gen Dynam Informat Technol, Wright Patterson AFB, OH USA.
NR 12
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600117
ER
PT S
AU Miranda, A
Cheney, M
AF Miranda, Analee
Cheney, Margaret
GP IEEE
TI Imaging with waves bounced from a dispersive reflector
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB We develop a linearized imaging theory that combines the spatial, temporal, and spectral components of multiply scattered waves. We consider the case of multiple fixed sensors viewing a distribution of multiple moving objects (targets) in an environment in which known multipath scattering takes place. In this paper, we investigate the case in which the multipath scattering is also dispersive, i.e., is different for different frequencies.
The strategy is to develop a model for the data that includes the sensor positions, transmitted waveforms, and angle-of-departure of the transmitted field. We use this model to develop an imaging method that is a modification of a tomographic, filtered backprojection method that produces a phase-space image.
In this work we also analyze the image via a multi-dimensional point-spread function and we identify how the imaging system reacts to parameters such as frequency, number of sensors, and wave path. We demonstrate, through example, that enhanced phase-space resolution for a distribution of stationary targets, in the presence of a dispersive reflector, may be achieved via a tomographic approach with a priori knowledge about the wave path and the nature of the multipath scattering.
C1 [Miranda, Analee] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Cheney, Margaret] Rensselaer Polytech Inst, Dept Math Sci, Troy, NY 12181 USA.
RP Miranda, A (reprint author), USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM analee.miranda@wpafb.af.mil; cheney@rpi.edu
FU Air Force Research Laboratory under RF Integrated Systems In-House
Research [JON 76221104]; DOD High Performance Computing Modernization
Program at ARL DSRC; DOD High Performance Computing Modernization
Program at AFRL; Air Force Office of Scientific Research under AFOSR
[FA9550-09-1-0013]
FX AM was supported by the Air Force Research Laboratory under RF
Integrated Systems In-House Research Contract Number JON 76221104. AM
was also supported in part by a grant of computer time from the DOD High
Performance Computing Modernization Program at ARL DSRC and AFRL. AM is
grateful to the Air Office of Scientific Research for its continued
support. MC thanks the Air Force Office of Scientific Research for
support under AFOSR Contract FA9550-09-1-0013.
NR 12
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600029
ER
PT S
AU Monga, V
Rangaswamy, M
AF Monga, Vishal
Rangaswamy, Muralidhar
GP IEEE
TI RANK CONSTRAINED ML ESTIMATION OF STRUCTURED COVARIANCE MATRICES WITH
APPLICATIONS IN RADAR TARGET DETECTION
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB We consider here the continually important problem of radar target detection in the presence of clutter, noise and jamming. Under complex Gaussian noise statistics, the optimal detection statistic relies on an inversion of the disturbance (clutter + noise and jamming) covariance matrix. The disturbance (and hence clutter) covariance must be estimated in practice from sample, i.e. training observations. Traditional maximum likelihood (ML) estimators are effective when training is abundant but lead to poor estimates and hence high detection error in the realistic regime of limited or small training. The problem is exacerbated by recent advances which have led to high dimensionality N of the observations arising from increased antenna elements (J) as well as higher temporal resolution (P time epochs and finally N - J. P). This work introduces physically inspired constraints into ML estimation. In particular, we exploit both the structure of the disturbance covariance and importantly the knowledge of the clutter rank to yield a new rank constrained maximum likelihood (RCML) estimator of clutter/disturbance covariance. Experimental validation on the KASSPER data set (where ground truth covariance is made available) shows that the proposed estimator vastly outperforms state-of-the art alternatives in the sense of: 1.) higher normalized signal to interference and noise ratio (SINR), and 2.) lower variance of target amplitude estimators that utilize disturbance covariance. Crucially the proposed RCML estimator can excel even for low training including the notoriously difficult regime of K <= N training samples.
C1 [Monga, Vishal] Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
[Rangaswamy, Muralidhar] Wright Patterson Air Force Base, Air Force Res Lab, Dayton, OH USA.
RP Monga, V (reprint author), Penn State Univ, Dept Elect Engn, University Pk, PA 16802 USA.
NR 12
TC 0
Z9 0
U1 0
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600088
ER
PT S
AU Park, J
Johnson, JT
Majurec, N
Frankford, M
Culpepper, E
Reynolds, J
Tenbarge, J
Westbrook, L
AF Park, J.
Johnson, J. T.
Majurec, N.
Frankford, M.
Culpepper, E.
Reynolds, J.
Tenbarge, J.
Westbrook, L.
GP IEEE
TI Software Defined Radar Studies of Human Motion Signatures
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB The detection and monitoring of human motion with radar has numerous applications in surveillance, urban military operations, search-and-rescue, and other areas. Recent studies have shown that movements of humans generate unique micro-Doppler signatures that can be exploited to classify human motions. This motivates an improved understanding of human Doppler signatures. Numerous simulations and measurements of human "dismount" signatures has been performed in the past, but most have been focused on a single radar center-frequency and have not taken polarization effects into consideration. In this paper, human modeling and motion measurements using multiple radar frequencies are proposed to explore the impact of the radar frequency on human range/Doppler signatures. Furthermore, ground effects on human targets are investigated using a four path model. The OSU Software defined radar (SDR) system, which can be tuned from 2GHz to 18 GHz with 500MHz bandwidth, was used for the measurements. This radar can operate at two frequencies simultaneously, allowing for dual frequency human measurements. Also, different polarizations are considered to understand human Doppler signatures. Modeling efforts are based on a finite dielectric cylinder approximation, so that the human body is modeled as a collection of dielectric cylinders. Scattering signatures are computed neglecting scattering interactions among these cylinders.
C1 [Park, J.; Johnson, J. T.; Majurec, N.; Frankford, M.] Ohio State Univ, Dept Elect & Comp Engn, Electrosci Lab, Columbus, OH 43212 USA.
[Culpepper, E.; Reynolds, J.; Tenbarge, J.; Westbrook, L.] Sensor Directorate Wright Patterson AFB, Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Park, J (reprint author), Ohio State Univ, Dept Elect & Comp Engn, Electrosci Lab, Columbus, OH 43212 USA.
EM park.918@osu.edu; Johnson@ece.osu.edu; majurec.1@osu.edu;
frankford.7@osu.edu; Edwin.Culpepper@wpafb.af.mil;
John.reynolds2@wpafb.af.mil; Joseph.Tenbarge@wpafb.af.mil;
Lamar.Westbrook@wpafb.af.mil
FU Air Force Research Laboratory
FX This research is funded by Air Force Research Laboratory fellowship
program
NR 23
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600110
ER
PT S
AU Patton, LK
Bryant, CA
Himed, B
AF Patton, Lee K.
Bryant, Christine A.
Himed, Braham
GP IEEE
TI Radar-Centric Design of Waveforms with Disjoint Spectral Support
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
DE sparse waveform; thinned spectrum; spectrally disjoint waveform; radar
waveform optimization; constant modulus constraint; ambiguity
constraints
AB Radar designers seek transmit waveforms that have an acceptable time envelope (modulus), power spectral density, and ambiguity function. However, these three waveform properties are often derived from different sources, which can result in requirement inconsistency. This paper re-examines the design of radar waveforms with disjoint spectral support (also known as sparse frequency or thinned spectrum waveform design) from the perspective of these waveform properties. The conventional multi-objective optimization approach is discarded in favor of constrained nonlinear programming, which can accommodate firm constraints on the waveform modulus and ambiguity function when minimizing transmission energy in specified stop-bands. A novel autocorrelation sequence masking method is used to satisfy the ambiguity constraints. This affords more precise control over range sidelobes than does the more common approach of penalizing integrated sidelobe level. Numeric examples are presented that demonstrate the efficacy of the approach.
C1 [Patton, Lee K.; Bryant, Christine A.] Matrix Res, Dayton, OH USA.
[Himed, Braham] Air Force Res Lab, WPAFB, Wright Patterson AFB, OH USA.
RP Patton, LK (reprint author), Matrix Res, Dayton, OH USA.
EM lee.patton@matrixresearch.com; christine.bryant@matrixresearch.com;
braham.himed@wpfb.af.mil
NR 12
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600049
ER
PT S
AU Rossler, CW
Minardi, MJ
Ertin, E
Moses, RL
AF Rossler, Carl W.
Minardi, Michael J.
Ertin, Emre
Moses, Randolph L.
GP IEEE
TI Optimal Detectors for Multi-Target Environments
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
ID ADAPTIVE PULSE-COMPRESSION
AB The matched filter is known to be the optimal detector for a single target with known impulse response in white noise. However, many radar systems operate in multi-target environments, for which the matched filter is suboptimal due to modeling mismatch of the background signal. In this paper, we study the hypothesis testing problem of detecting a target at a given range cell while modeling all targets at other range cells as a correlated background process. We consider both deterministic-unknown and random amplitude target models, and derive the corresponding optimal detectors. For the deterministic-unknown signal model, we show that special cases of the optimal detector reduce to ridge regression (a classical solution for inverse problems), sidelobe suppression (a heuristic solution for target detection in multi-target environments), or adaptive pulse compression. The detector resulting from the random amplitude signal model reduces to that of the deterministic signal model for targets modeled as occupying a single range cell. Range-Doppler extension are given. We illustrate the performance of the detector using simulated data and the civilian vehicle data dome set.
C1 [Rossler, Carl W.; Ertin, Emre; Moses, Randolph L.] Ohio State Univ, Sch Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
[Minardi, Michael J.] US Air Force, Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Rossler, CW (reprint author), Ohio State Univ, Sch Elect & Comp Engn, Wright Patterson AFB, OH 45433 USA.
EM rossler.3@osu.edu
RI Ertin, Emre/G-4937-2012
NR 15
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600175
ER
PT S
AU Sotirelis, P
Parker, JT
Fu, M
Hu, XY
Albanese, R
AF Sotirelis, Paul
Parker, Jason T.
Fu, Michael
Hu, Xueyu
Albanese, Richard
GP IEEE
TI A Study of Material Identification using SAR
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB We investigate the feasibility of using synthetic aperture radar (SAR) data to identify materials at each pixel in a SAR image. A fundamental concept underlying our approach is to extract the dispersion of the reflectivity at each pixel by dividing the data into several frequency sub-bands. We first compute synthetic radar data using parameters that are characteristic of a typical wide-band SAR system operating in a spotlight mode and illuminating several scattering regions that differ in their frequency response. Secondly, we process the data by subdividing the full data set into frequency sub-bands thereby extracting the dispersion at each pixel. Third and finally, we perform the material identification using a rudimentary classification analysis. The approach described herein offers a new method for planning experimental data collections for the purpose of material identification through SAR image formation.
C1 [Sotirelis, Paul; Parker, Jason T.; Fu, Michael; Hu, Xueyu] USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Albanese, Richard] Albanese Defense & Energy Dev Co, San Antonio, TX 78217 USA.
RP Sotirelis, P (reprint author), USAF, Sensors Directorate, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM paul.sotirelis@wpafb.af.mil; jason.parker@wpafb.af.mil;
richard.albanese2@gmail.com
FU AFOSR
FX J.T.P. and R.A. acknowledge support by AFOSR under the direction of Dr.
Arje Nachman.
NR 12
TC 0
Z9 0
U1 0
U2 1
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 4
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600021
ER
PT S
AU Stringer, J
Lamont, G
Akers, G
AF Stringer, Jeremy
Lamont, Gary
Akers, Geoffrey
GP IEEE
TI Multi-Objective Evolutionary Algorithm Determined Radar Phase Codes
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB Solving complex real world Multi-Objective Optimization problems is the forte of Multi-Objective Evolutionary Algorithms (MOEA). Such algorithms have been part of many scientific and engineering endeavors. This study applies the NSGA-II and SPEA2 MOEAs to the radar phase coded waveform design problem. The MOEAs are used to generate a series of radar waveform phase codes that have excellent range resolution and Doppler resolution capabilities. The study compares the ability of NSGA-II and SPEA2 to continually evolve (phase code) solutions on the Pareto front for the problem while maintaining a diversity of solutions (phase codes). Results demonstrate that for the radar phase code problem NSGA-II provides a more diverse population of acceptable solutions and therefore a greater number of different viable phase codes when compared to the solutions provided by SPEA2
C1 [Stringer, Jeremy; Lamont, Gary; Akers, Geoffrey] USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Stringer, J (reprint author), USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM jeremy.stringer@afit.edu
NR 13
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600030
ER
PT S
AU Thorson, TJ
Akers, GA
AF Thorson, T. Joel
Akers, Geoffrey A.
GP IEEE
TI Near Real-Time Simultaneous Range and Velocity Processing in a Random
Noise Radar
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB The Air Force Institute of Technology (AFIT) has developed an ultrawideband (UWB) random noise radar (RNR) that operates in the UHF band. The large fractional bandwidth and lack of phase coherency within the AFIT RNR necessitate an alternative to classical Doppler processing for velocity estimation. A time-domain approach to simultaneous range and velocity processing has been implemented in the AFIT RNR but results in significant memory requirements and impractical processing times. This paper presents a method to reduce the two-dimensional (2D) processing time by over an order of magnitude by segmenting the signal processing algorithm in order to parallelize on a graphics processing unit (GPU).
C1 [Thorson, T. Joel; Akers, Geoffrey A.] USAF, Grad Sch Engn & Management, Inst Technol, Dayton, OH 45433 USA.
RP Thorson, TJ (reprint author), USAF, Grad Sch Engn & Management, Inst Technol, Dayton, OH 45433 USA.
EM timothy.thorson@afit.edu; geoffrey.akers@afit.edu
NR 14
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 6
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600108
ER
PT S
AU Vela, R
Narayanan, RM
Gallagher, KA
Rangaswamy, M
AF Vela, Russell
Narayanan, Ram M.
Gallagher, Kyle A.
Rangaswamy, Muralidhar
GP IEEE
TI Noise Radar Tomography
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
AB While traditionally employed in acoustics, tomographic imaging techniques have made a transition into the microwave regime and are finding application in areas such as ground penetrating radar (GPR). While excitation methods vary depending upon the application, little or no literature exists on the use of an arbitrary noise waveform as an excitation method in tomography. This paper complements the existing literature on tomography by presenting an ultra wideband (UWB) radar design, utilized for tomography, whose excitation source is of an arbitrary noise origin operating from 4 to 8 GHz at a full 4 GHz bandwidth. Evidence of this source's ability to be used in tomography is presented through the generation of two dimensional cross sectional images of three dimensional objects such as metallic and dielectric cylinders in various positions, under both unobscured and concealed conditions.
C1 [Vela, Russell] Univ Dayton, Res Inst, USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
[Narayanan, Ram M.; Gallagher, Kyle A.] Penn State Univ, Dept Elect Engn, University Pk, PA 16801 USA.
[Rangaswamy, Muralidhar] Air Force Res Lab, Wright Patterson AFB, OH 45433 USA.
RP Vela, R (reprint author), Univ Dayton, Res Inst, USAF, Res Lab, Wright Patterson AFB, OH 45433 USA.
EM Russell.vela.ctr@wpafb.af.mil
NR 5
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600132
ER
PT S
AU Zelnio, AM
Rigling, BD
AF Zelnio, Anne M.
Rigling, Brian D.
GP IEEE
TI Detection-Based Localization of Passive Radar Receivers
SO 2012 IEEE RADAR CONFERENCE (RADAR)
SE IEEE Radar Conference
LA English
DT Proceedings Paper
CT IEEE Radar Conference (RADAR)
CY MAY 07-11, 2012
CL Atlanta, GA
SP IEEE, IEEE, Aerosp & Elect Syst Soc (AESS), IEEE Atlanta Sect
ID SENSORS; NETWORK
AB Passive coherent radar (PCR) is a growing threat to air power. PCRs use ambient signals (e. g., television, FM radio, other radars, etc.) to allow covert operation and thereby make receiver sites virtually undetectable, which complicates the use of conventional countermeasures. We seek to infer information about the receiver location based on the system's behavior, in particular hypothesized knowledge of detection performance as a function of specific aircraft trajectories. Given this detection-only record, the maximum likelihood estimate (MLE) of the receiver position and the Cramer-Rao bound (CRB) on this estimate are derived. A Monte-Carlo simulation is performed for different detection records validating the MLE and CRB derivations.
C1 [Zelnio, Anne M.] USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
[Rigling, Brian D.] Wright State Univ, Dept Elect Engn, Dayton, OH 45435 USA.
RP Zelnio, AM (reprint author), USAF, Res Lab, Sensors Directorate, Wright Patterson AFB, OH 45433 USA.
EM anne.zelnio@wpafb.af.mil; brian.rigling@wright.edu
NR 9
TC 0
Z9 0
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 1097-5764
BN 978-1-4673-0658-4
J9 IEEE RAD CONF
PY 2012
PG 5
WC Engineering, Electrical & Electronic; Physics, Applied
SC Engineering; Physics
GA BCA05
UT WOS:000309340600032
ER
PT J
AU Cherry, M
Knopp, J
Blodgett, M
Grandhi, R
AF Cherry, Matthew
Knopp, Jeremy
Blodgett, Mark
Grandhi, Ramana
TI Experimental eddy current measurements of flawed edges compared with
results from probabilistic numerical models
SO INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
LA English
DT Article; Proceedings Paper
CT 15th International Symposium on Applied Electromagnetics and Mechanics
(ISEM)
CY SEP 07-09, 2011
CL Naples, ITALY
SP Univ Cassino & Lazio Meridionale, Univ Napoli Federico II, Japan Soc Appl Electromagent & Mech, Japan Soc Maintenol, Natl Res Council (CNR), SPIN Inst, Lecroy, Ansys, Infolytica Europe, Cedrat Grp
DE Probabilistic; collocation; eddy; current
ID VALIDATION
AB Eddy current detection of flaws in edges presents challenges in experimental procedures during benchmark studies in the laboratory for model validation as well as practical implementation of a real world detection system. These difficulties result in distortions to the signal that mask the effects from the flawed region itself. Rather than attempting to perfect the experimental setup, we propose to make the numerical models more robust by incorporating randomness in the experimental procedure with uncertainty quantification methods. We present the motivation for the specific method chosen, the probabilistic collocation method (PCM), and the mathematical development behind the method, and then present the results from numerical simulations with a validation measure.
C1 [Cherry, Matthew] Univ Dayton, Res Inst, Struct Integr Div, Dayton, OH 45469 USA.
[Knopp, Jeremy; Blodgett, Mark] USAF, NDE Branch, Res Labs, Dayton, OH USA.
[Grandhi, Ramana] Wright State Univ, ME Dept, Dayton, OH 45435 USA.
RP Cherry, M (reprint author), Univ Dayton, Res Inst, Struct Integr Div, 300 Coll Pk, Dayton, OH 45469 USA.
EM matthew.cherry.ctr@wpafb.af.mil
NR 9
TC 1
Z9 1
U1 1
U2 3
PU IOS PRESS
PI AMSTERDAM
PA NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS
SN 1383-5416
J9 INT J APPL ELECTROM
JI Int. J. Appl. Electromagn. Mech.
PY 2012
VL 39
IS 1-4
BP 283
EP 289
DI 10.3233/JAE-2012-1472
PG 7
WC Engineering, Electrical & Electronic; Mechanics; Physics, Applied
SC Engineering; Mechanics; Physics
GA 017PM
UT WOS:000309602700038
ER
PT S
AU Taylor, CN
AF Taylor, Clark N.
GP IEEE
TI Improved Fusion of Visual Measurements Through Explicit Modeling of
Outliers
SO 2012 IEEE/ION POSITION LOCATION AND NAVIGATION SYMPOSIUM (PLANS)
SE IEEE-ION Position Location and Navigation Symposium
LA English
DT Proceedings Paper
CT IEEE/ION Position Location and Navigation Symposium (PLANS)
CY APR 23-26, 2012
CL Myrtle Beach, SC
SP IEEE, AESS, ION
ID RANDOM SAMPLE CONSENSUS; MOTION ESTIMATION
AB sd With the recent proliferation of low-cost, lightweight, and high-resolution cameras, significant research has been conducted on utilizing visual sensors within navigation systems. Visual sensors, however, are different from more traditional sensors utilized within estimation systems because cameras do not directly sense the quantity (or its derivative/integral) to be estimated/fused. Instead, the luminance outputs of the camera sensor are processed algorithmically to obtain some other quantity that is used as an input to an estimator. Sample outputs of vision processing algorithms utilized in automated systems include optical flow, feature tracks, or object localization. Unfortunately, the outputs of these algorithms do not conform to the traditional model of the true measurement plus a Gaussian random process. Instead, each of the algorithms occasionally produce spurious outputs (outliers) that deviate significantly from the true value being observed. In addition, the probability of an outlier occurring and its effects on down-stream algorithms are generally unknown. In this paper, we present an estimation approach that explicitly considers the probability of outliers and performs maximum likelihood estimation over a distribution with outliers. In addition to more accurately estimating the final state, the predicted uncertainty of the system is shown to be accurate.
C1 USAF, Res Lab, Washington, DC USA.
RP Taylor, CN (reprint author), USAF, Res Lab, Washington, DC USA.
NR 17
TC 4
Z9 4
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-358X
BN 978-1-4673-0387-3
J9 IEEE POSITION LOCAT
PY 2012
BP 512
EP 517
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BBZ87
UT WOS:000309273900065
ER
PT S
AU Jurado, J
Fisher, K
Veth, M
AF Jurado, Juan
Fisher, Kenneth
Veth, Michael
GP IEEE
TI Inertial and Imaging Sensor Fusion for Image-Aided Navigation with
Affine Distortion Prediction
SO 2012 IEEE/ION POSITION LOCATION AND NAVIGATION SYMPOSIUM (PLANS)
SE IEEE-ION Position Location and Navigation Symposium
LA English
DT Proceedings Paper
CT IEEE/ION Position Location and Navigation Symposium (PLANS)
CY APR 23-26, 2012
CL Myrtle Beach, SC
SP IEEE, AESS, ION
AB The Air Force Institute of Technology's Advanced Navigation Technology center has invested significant research time and effort into alternative precision navigation methods in an effort to counteract the increasing dependency on Global Positioning System for precision navigation. The use of visual sensors has since emerged as a valuable and feasible precision navigation alternative which, when coupled with inertial navigation sensors, can reduce navigation estimation errors by approximately two orders of magnitude [1] when compared to inertial-only solutions. A key component of many image-aided navigation algorithms is the requirement to detect and track salient features over many frames of an image sequence. However, feature matching accuracy is drastically reduced when the image sets differ in 3-D pose due to the affine distortions induced on feature descriptors [2]. In this research, this is counteracted by digitally simulating affine distortions on input images in order to calculate more accurate feature descriptors, which provide improved matching across large changes in viewpoint. These techniques are experimentally demonstrated in an outdoor environment with a consumer-grade inertial sensor and three imaging sensors, one of which is orthogonal to the others. False matches generated by using the orthogonal camera are shown to degrade the navigation solution if change in 3-D pose is not accounted for. Using a tactical-grade inertial sensor coupled with GPS position data as the truth source, the improved image-aided navigation algorithm, which accounts for changes in 3-D pose, is shown to reduce navigation errors by 24% in position, 16% in velocity, and 35% in attitude compared to the standard two-camera image-aided navigation setup.
C1 [Jurado, Juan; Fisher, Kenneth; Veth, Michael] USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
RP Jurado, J (reprint author), USAF, Dept Elect & Comp Engn, Inst Technol, Wright Patterson AFB, OH 45433 USA.
EM juan.jurado@afit.edu; kenneth.fisher@afit.edu; michael.veth@eglin.af.mil
NR 10
TC 3
Z9 3
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-358X
BN 978-1-4673-0387-3
J9 IEEE POSITION LOCAT
PY 2012
BP 518
EP 526
PG 9
WC Engineering, Electrical & Electronic
SC Engineering
GA BBZ87
UT WOS:000309273900066
ER
PT S
AU Schnaufer, BA
Hwang, P
Nadke, J
McGraw, GA
Venable, D
AF Schnaufer, Bernard A.
Hwang, Patrick
Nadke, Jeremy
McGraw, Gary A.
Venable, Donald
GP IEEE
TI Collaborative Image Navigation Simulation and Analysis for UAVs in GPS
Challenged Conditions
SO 2012 IEEE/ION POSITION LOCATION AND NAVIGATION SYMPOSIUM (PLANS)
SE IEEE-ION Position Location and Navigation Symposium
LA English
DT Proceedings Paper
CT IEEE/ION Position Location and Navigation Symposium (PLANS)
CY APR 23-26, 2012
CL Myrtle Beach, SC
SP IEEE, AESS, ION
DE collaborative image navigation; positioning; high-fidelity simulation;
GPS Denied
AB Accurate and robust position, navigation, and time (PNT) data is a key-enabler for multi-platform collaborative sensing for a diverse array of military operations. The AFRL Collaborative Robust Integrated Sensor Positioning (CRISP) program has investigated techniques that leverage shared sensor data to enhance the availability of reliable PNT information for all platforms in a network, particularly those that experience GPS outages, utilizing electro-optical (EO) payload data in conjunction with GPS and inertial data. Rockwell Collins has developed an architecture for enabling continuous navigation capabilities for airborne platforms having disparate sensing capabilities in GPS challenged and denied conditions. In this study program the Rockwell Collins architecture was evaluated via a high-fidelity simulation environment. Navigation performance results for our solution were produced and presented by exercising our simulation with an AFRL-provided dataset. The performance results have shown that our collaborative image navigation architecture and implementation supports extended, GPS-Ievel navigation accuracy in GPS Denied conditions.
C1 [Schnaufer, Bernard A.; Hwang, Patrick; Nadke, Jeremy; McGraw, Gary A.] Rockwell Collins, Adv Technol Ctr, Cedar Rapids, IA USA.
[Venable, Donald] AF Res Lab, Reference Syst Branch, Dayton, OH USA.
RP Schnaufer, BA (reprint author), Rockwell Collins, Adv Technol Ctr, Cedar Rapids, IA USA.
FU Air Force Research Laboratory [FA8650-11-C-1039]
FX Support for this work was provided by the Reference Systems Branch of
the Air Force Research Laboratory under 729 contract FA8650-11-C-1039.
We also acknowledge the important contributions and assistance of Dr.
Curtis Padgett and his team at the Jet Propulsion Laboratory for
georeferencing processing functionality.
NR 3
TC 1
Z9 1
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-358X
BN 978-1-4673-0387-3
J9 IEEE POSITION LOCAT
PY 2012
BP 719
EP 729
PG 11
WC Engineering, Electrical & Electronic
SC Engineering
GA BBZ87
UT WOS:000309273900093
ER
PT S
AU Brink, K
Soloviev, A
AF Brink, Kevin
Soloviev, Andrey
GP IEEE
TI Filter-Based Calibration for an IMU and Multi-Camera System
SO 2012 IEEE/ION POSITION LOCATION AND NAVIGATION SYMPOSIUM (PLANS)
SE IEEE-ION Position Location and Navigation Symposium
LA English
DT Proceedings Paper
CT IEEE/ION Position Location and Navigation Symposium (PLANS)
CY APR 23-26, 2012
CL Myrtle Beach, SC
SP IEEE, AESS, ION
ID OBSERVABILITY ANALYSIS
AB Vision-aided Inertial Navigation Systems (vINS) are capable of providing accurate six degree of freedom (6DoF) state estimation for autonomous vehicles (AVs) in the absence of Global Positioning System (GPS) and other global references. Features observed by a camera can be combined with measurements from an inertial measurement unit (lMU) in a filter to estimate the desired vehicle states. To do so, the rigid body transformation between cameras and the IMU must be known with high precision. Extended Kalman filters (EKF) and Unscented Kalman filters (UKF) have been used to calibrate camera and IMU systems requiring only a simple calibration target and moderate IMU-camera motion. T his paper focuses on indoor applications where it is assumed a user is able to easily manipulate the sensor package. We extend the UKF filter to calibrate an IMU paired with an arbitrary number of cameras, with or without overlapping fields of view.
C1 [Brink, Kevin] USAF, Res Lab, Eglin AFB, FL 32542 USA.
[Soloviev, Andrey] Univ Florida, Shalimar, FL 32579 USA.
RP Brink, K (reprint author), USAF, Res Lab, Eglin AFB, FL 32542 USA.
EM kevin.brink2@eglin.af.mil; soloviev@uft.edu
NR 20
TC 2
Z9 2
U1 0
U2 0
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-358X
BN 978-1-4673-0387-3
J9 IEEE POSITION LOCAT
PY 2012
BP 730
EP 739
PG 10
WC Engineering, Electrical & Electronic
SC Engineering
GA BBZ87
UT WOS:000309273900094
ER
PT S
AU Zhu, Z
Roumeliotis, S
Hesch, J
Park, H
Venable, D
AF Zhu, Zhen
Roumeliotis, Stergios
Hesch, Joel
Park, Han
Venable, Don
GP IEEE
TI Architecture for Asymmetric Collaborative Navigation
SO 2012 IEEE/ION POSITION LOCATION AND NAVIGATION SYMPOSIUM (PLANS)
SE IEEE-ION Position Location and Navigation Symposium
LA English
DT Proceedings Paper
CT IEEE/ION Position Location and Navigation Symposium (PLANS)
CY APR 23-26, 2012
CL Myrtle Beach, SC
SP IEEE, AESS, ION
DE layered sensing; vision-aided; asymmetric; collaborative navigation
AB Under the Air Force Research Laboratory (AFRL) Collaborative Robust Integrated Sensor Positioning (CRISP) program, Northrop Grumman Corporation (NGC) is designing and building a collaborative navigation system for multiple airborne platforms. The collaborative navigation architecture has been designed to take advantage of AFRL's Layered Sensing construct which enables platforms to share information. In particular, the ability to share GPS, relative range, imagery, geo-registered maps, and other measurements opens up many opportunities to improve the navigational accuracy and the robustness to GPS-denied conditions.
In the CRISP program, the collaborative navigation system is being designed to be more robust and accurate by leveraging the asymmetry in the sensing, computation, and communication capabilities of disparate platforms. For example, the system takes advantage of higher performing sensors on the high-flyer (HF) platform, which are less susceptible to jamming, and cameras that generate larger sensor footprint and higher resolution images of the terrain. The low-flyers (LFs) have poorer navigation sensors, are more likely to be jammed, and have a more limited view of the terrain. Under this scenario, the HF may assist one or more LFs such that they, too, can have similar accuracy as the HF in a GPS-denied environment.
C1 [Zhu, Zhen; Park, Han] Northrop Grumman Corp, Woodland Hills, CA 91367 USA.
[Roumeliotis, Stergios; Hesch, Joel] Univ Minnesota, Minneapolis, MN USA.
[Venable, Don] US Air Force, Res Lab, Wright Patterson AFB, OH USA.
RP Zhu, Z (reprint author), Northrop Grumman Corp, Woodland Hills, CA 91367 USA.
NR 13
TC 1
Z9 1
U1 0
U2 4
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-358X
BN 978-1-4673-0387-3
J9 IEEE POSITION LOCAT
PY 2012
BP 777
EP 782
PG 6
WC Engineering, Electrical & Electronic
SC Engineering
GA BBZ87
UT WOS:000309273900099
ER
PT S
AU Taylor, CN
AF Taylor, Clark N.
GP IEEE
TI An Analysis of Observability-Constrained Kalman Filtering for
Vision-Aided Navigation
SO 2012 IEEE/ION POSITION LOCATION AND NAVIGATION SYMPOSIUM (PLANS)
SE IEEE-ION Position Location and Navigation Symposium
LA English
DT Proceedings Paper
CT IEEE/ION Position Location and Navigation Symposium (PLANS)
CY APR 23-26, 2012
CL Myrtle Beach, SC
SP IEEE, AESS, ION
ID SIMULTANEOUS LOCALIZATION
AB Significant improvements in the accuracy of navigation state estimation have been previously demonstrated through the fusion of inertial measurement unit (IMU) and visual sensor data in both GPS-denied and GPS-enabled scenarios. Despite this improved navigation state accuracy, several significant hurdles remain before widespread acceptance of vision-aided navigation can be achieved. One significant bottleneck is the lack of accurate information about the performance of the vision-aided navigation algorithms. Many vision-aided navigation algorithms are implemented using some form of the Kalman Filter, thereby returning a covariance estimate that should correspond with the accuracy of the current navigation estimate. Unfortunately, a well known problem with the Kalman Filter is that its covariance estimates are inconsistent, i.e. the Kalman Filter estimates of uncertainty are significantly smaller than the true uncertainty achieved by the Kalman Filter. Recently a set of papers has introduced the concept of "observability-constrained" Kalman filtering that helps solve the consistency problem. In this paper, we apply the observability-constrained Kalman Filter to a vision-aided navigation problem and analyze its results. Significantly more accurate state and uncertainty estimates are achieved using the observability-constrained Kalman Filter. Unfortunately, the it is still not consistent, so a comparison with a batch, bundle adjustment approach is also performed to verify the possibility of consistent uncertainty estimation.
C1 USAF, Res Lab, Sensors Directorate, Colorado Springs, CO 80840 USA.
RP Taylor, CN (reprint author), USAF, Res Lab, Sensors Directorate, Colorado Springs, CO 80840 USA.
NR 18
TC 3
Z9 3
U1 1
U2 2
PU IEEE
PI NEW YORK
PA 345 E 47TH ST, NEW YORK, NY 10017 USA
SN 2153-358X
BN 978-1-4673-0387-3
J9 IEEE POSITION LOCAT
PY 2012
BP 1240
EP 1246
PG 7
WC Engineering, Electrical & Electronic
SC Engineering
GA BBZ87
UT WOS:000309273900153
ER
EF