FN Thomson Reuters Web of Science™ VR 1.0 PT J AU Kiefer, CR McKenney, JB Trainor, JF Lifshitz, L Krasnicki, S Schneider, T Schrier, SL Morrow, JS Valeri, CR Snyder, LM AF Kiefer, CR McKenney, JB Trainor, JF Lifshitz, L Krasnicki, S Schneider, T Schrier, SL Morrow, JS Valeri, CR Snyder, LM TI Hemoglobin-spectrin complexes: Distribution within the erythrocyte skeleton. SO BLOOD LA English DT Meeting Abstract C1 UNIV MASSACHUSETTS,MED CTR,DEPT PHYSIOL,WORCESTER,MA. UNIV MASSACHUSETTS,MED CTR,DEPT HOSP LABS CLIN PATHOL,WORCESTER,MA. YALE UNIV,SCH MED,DEPT PATHOL,NEW HAVEN,CT 06510. STANFORD UNIV,SCH MED,DIV HEMATOL,STANFORD,CA 94305. BOSTON UNIV,SCH MED,USN,BLOOD RES LAB,BOSTON,MA 02118. NR 0 TC 0 Z9 0 U1 1 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 2509 EP 2509 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91002510 ER PT J AU Davis, TA Saini, AA Lee, KP AF Davis, TA Saini, AA Lee, KP TI In vivo administration of porcine microvascular endothelial conditioned medium stimulates multipotential hematopoietic progenitor cell growth in normal mice. SO BLOOD LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 2749 EP 2749 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91002750 ER PT J AU Davis, TA June, CH Craighead, N Lee, KP AF Davis, TA June, CH Craighead, N Lee, KP TI Porcine microvascular and aortic endothelial cells costimulate cyclosporin-A resistant human T-cell proliferation through CD28 but differ in ability to deliver a primary activation signal SO BLOOD LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1995 VL 86 IS 10 SU 1 BP 2841 EP 2841 PG 1 WC Hematology SC Hematology GA TH910 UT WOS:A1995TH91002842 ER PT J AU RAJAGOPAL, AK BUOT, FA AF RAJAGOPAL, AK BUOT, FA TI A NONEQUILIBRIUM TIME-DEPENDENT FUNCTIONAL THEORY-BASED ON LIOUVILLEAN QUANTUM-FIELD DYNAMICS SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article; Proceedings Paper CT Satellite Symposium on Thirty-Years of Density Functional Theory - Concepts and Applications CY JUN 13-16, 1994 CL JAGIELLONIAN UNIV, KRAKOW, POLAND SP Jagiellonion Univ HO JAGIELLONIAN UNIV AB A brief description of an extension of the time-dependent functional theory to coupled field systems such as electron-ion and electron-electromagnetic fields is given. This theory is further generalized to situations where the system is initially in thermodynamic equilibrium and is subjected to external time-dependent probes which may drive the system out of equilibrium. Such a generalization is based on the Liouvillean quantum field dynamics (LQFD). The above formalism provides a firm physical and mathematical basis for time-dependent simulation procedures such as those based on the Car-Parrinello approach by replacing the fictitious Lagrangian by a precise action principle. Several physical examples are given to illustrate the need for this formalism, where there is a necessity for treating all the field variables on equal footing and in a self-consistent way. A new alternate formalism of time-dependent functional theory based on a novel application of the Baym Phi-derivable method is also given in terms of LQFD. By choosing suitable processes to set up the Phi-functional, our functional theory is transformed into a practical self-consistent approach to the quantum many-body equilibrium and transport problems, with built-in conservation laws for all the physically relevant variables. (C) 1995 John Wiley & Sons, Inc. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 28 TC 5 Z9 5 U1 0 U2 0 PU JOHN WILEY & SONS INC PI HOBOKEN PA 111 RIVER ST, HOBOKEN, NJ 07030 USA SN 0020-7608 J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PD NOV 15 PY 1995 VL 56 IS 4 BP 389 EP 397 DI 10.1002/qua.560560425 PG 9 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA TA504 UT WOS:A1995TA50400024 ER PT J AU MOLNAR, B EDDY, CR DOVERSPIKE, K AF MOLNAR, B EDDY, CR DOVERSPIKE, K TI THE INFLUENCE OF CH4/H-2/AR PLASMA-ETCHING ON THE CONDUCTIVITY OF N-TYPE GALLIUM NITRIDE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GROWTH; GAN AB The influence of plasma etching on the electrical properties of n-type gallium nitride (GaN) thin films has been investigated. Electron-cyclotron-resonance microwave plasma reactive ion etching in CH4/H-2/Ar, in CH4/H-2, and in H-2 results in an increase in the GaN layer's sheet carrier concentration and a decrease in the effective Hall mobility. Neither wet chemical etching nor etching in Cl-2 or BCl3 plasmas introduces similar changes. Therefore, the observed damage is considered to be related to the CH4/H-2/Ar plasma chemistry. in particular, it suggests hydrogen influence on the defect generation. Subsequent annealing of the affected GaN layers at 800 degrees C removes the plasma damage. RP MOLNAR, B (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 21 Z9 21 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1995 VL 78 IS 10 BP 6132 EP 6134 DI 10.1063/1.360555 PG 3 WC Physics, Applied SC Physics GA TD633 UT WOS:A1995TD63300040 ER PT J AU ROGERS, JL ANDRY, PS VARHUE, WJ ADAMS, E LAVOIE, M KLEIN, PB AF ROGERS, JL ANDRY, PS VARHUE, WJ ADAMS, E LAVOIE, M KLEIN, PB TI ERBIUM-DOPED SILICON FILMS GROWN BY PLASMA-ENHANCED CHEMICAL-VAPOR-DEPOSITION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID IMPLANTED SI; LUMINESCENCE; EPITAXY; BEAM AB Epitaxial growth of erbium-doped silicon films has been performed by plasma-enhanced chemical vapor deposition using an electron-cyclotron-resonance source. The goal was to incorporate erbium as an optically active center (ErO6) through the use of metal-organic dopant sources. The characteristic 1.5 mu m emission was observed by photoluminescence. Chemical analysis of the film revealed, however, that the organic ligands were decomposing and contributing to the carbon contamination of the films. Analysis of the molecular flux to the substrate indicated that the metal-organic compound used, tris (2,2,6,6-tetramethyl-3-5-heptanedionato), was most likely to decompose, and supply unbonded atomic erbium and not the optical active species, ErO6. Excessive carbon contamination lowered epitaxial quality and reduced the photoluminescent intensity. Photoluminescent intensity was improved by a 600 degrees C anneal but was strongly quenched by a 900 degrees C anneal. The low-temperature anneal improved crystal quality,and the high-temperature anneal resulted in silicide formation. (C) 1995 American Institute of Physics. C1 IBM CORP,ESSEX JCT,VT 05452. USN,RES LAB,WASHINGTON,DC 20375. RP ROGERS, JL (reprint author), UNIV VERMONT,DEPT ELECT ENGN,BURLINGTON,VT 05405, USA. NR 28 TC 18 Z9 19 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1995 VL 78 IS 10 BP 6241 EP 6248 DI 10.1063/1.360571 PG 8 WC Physics, Applied SC Physics GA TD633 UT WOS:A1995TD63300058 ER PT J AU VARDIMAN, RG AYERS, JD JONES, HN AF VARDIMAN, RG AYERS, JD JONES, HN TI EFFECTS OF CU ON THE CRYSTALLIZATION BEHAVIOR OF AMORPHOUS FE71CR15MO4B10 SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID ULTRAFINE GRAIN-STRUCTURE; ALLOYS AB Following the approach of earlier studies which have demonstrated that nanocrystalline microstructures can be produced in soft magnetic alloys through the addition of one percent of Cu to Fe based amorphous precursor alloys, it is demonstrated that substantial grain refinement can be produced in alloys of interest for structural applications. Grain sizes of approximately 50 nm were produced in the alloy Fe70Cr15Mo4B10Cu1. Such grain sizes should permit superplastic consolidation of powder or flake at reasonable rates with moderate die pressures at temperatures in the vicinity of 650 degrees C. RP VARDIMAN, RG (reprint author), USN,RES LAB,MET PHYS LAB,CODE 6321,WASHINGTON,DC 20375, USA. NR 17 TC 4 Z9 4 U1 1 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD NOV 15 PY 1995 VL 30 IS 22 BP 5711 EP 5715 DI 10.1007/BF00356710 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA TF807 UT WOS:A1995TF80700023 ER PT J AU CHEN, S ESHAGHIAN, MM FREUND, RF POTTER, JL WU, YC AF CHEN, S ESHAGHIAN, MM FREUND, RF POTTER, JL WU, YC TI EVALUATION OF 2 PROGRAMMING PARADIGMS FOR HETEROGENEOUS COMPUTING SO JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING LA English DT Article ID ALGORITHMS AB In this paper, we evaluate two different programming paradigms for heterogeneous computing, Cluster-M and Heterogeneous Associative Computing (HAsC). These paradigms can efficiently support heterogeneous networks by preserving a level of abstraction without containing any architectural details. The paradigms are architecturally independent and scalable for various network and problem sizes. Cluster-M can be applied to both coarse-grained and fine-grained networks. Cluster-M provides an environment for porting heterogeneous tasks onto the machines in a heterogeneous suite such that resource utilization is maximized and the overall execution time is minimized. HAsC models a heterogeneous network as a coarse-grained associative computer. It is designed to optimize the execution of problems where the program size is small compared with the amount of data processed. Unlike other existing heterogeneous orchestration tools which are MIMD based, HAsC is for data-parallel SIMD associative computing. Ease of programming and execution speed are the primary goals of HAsC. We evaluate how these two paradigms can be used together to provide an efficient scheme for heterogeneous programming. Finally, their scalability issues are discussed. (C) 1993 Academic Press, Inc. C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT & E,SAN DIEGO,CA. KENT STATE UNIV,DEPT MATH & COMP SCI,KENT,OH 44242. RP CHEN, S (reprint author), NEW JERSEY INST TECHNOL,DEPT COMP & INFORMAT SCI,NEWARK,NJ 07102, USA. NR 30 TC 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0743-7315 J9 J PARALLEL DISTR COM JI J. Parallel Distrib. Comput. PD NOV 15 PY 1995 VL 31 IS 1 BP 41 EP 55 DI 10.1006/jpdc.1995.1143 PG 15 WC Computer Science, Theory & Methods SC Computer Science GA TF529 UT WOS:A1995TF52900004 ER PT J AU Smith, MA Frazier, WE Pregger, BA AF Smith, MA Frazier, WE Pregger, BA TI Effect of sulfur on the cyclic oxidation behavior of a single crystalline, nickel-base superalloy SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID OXIDE SCALE ADHERENCE; MCRALY ALLOYS; SEGREGATION; ADHESION; MECHANISM; ELEMENTS AB A commercial, single crystalline, nickel-base superalloy, Rene N6, was cyclically oxidized in 1200 degrees C air to evaluate the impact of indigenous sulfur impurities on the oxidation behavior. The sulfur concentrations of the samples were adjusted to levels in the sub-ppm range by heat treatment in hydrogen. Correlation between the residual sulfur levels and the degree of scale spallation are shown. Reduction of sulfur content to <0.1 ppm is shown to prevent any spalling of scale from the metal surface. Higher sulfur levels may be tolerated depending on oxidation time and temperature. Auger microscopy is used to demonstrate that extensive segregation (up to 27 at.%) of sulfur occurs at the metal/scale interface. In vacuum, debonding of the scale is shown to be difficult even when high concentrations of sulfur are present. The possible importance of humidity in the spallation process is discussed. RP Smith, MA (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,434200R-M-S08,WARMINSTER,PA 18974, USA. NR 25 TC 40 Z9 40 U1 2 U2 10 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD NOV 15 PY 1995 VL 203 IS 1-2 BP 388 EP 398 DI 10.1016/0921-5093(95)09819-4 PG 11 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA TM628 UT WOS:A1995TM62800043 ER PT J AU LEHMBERG, RH PAWLEY, CJ DENIZ, AV KLAPISCH, M LENG, Y AF LEHMBERG, RH PAWLEY, CJ DENIZ, AV KLAPISCH, M LENG, Y TI 2-PHOTON RESONANTLY-ENHANCED NEGATIVE NONLINEAR REFRACTIVE-INDEX IN XENON AT 248-NM SO OPTICS COMMUNICATIONS LA English DT Article ID TIME-DEPENDENT PROPAGATION; EXCIMER-LASER-PULSES; 2-PHOTON EXCITATION; 5P56P CONFIGURATION; ABSORPTION; GENERATION; ATMOSPHERE; BEAMS; AIR AB We report measurements and ab initio calculations of a large negative nonlinear refractive index in xenon for linearly-polarized KrF laser light, and describe a simple experiment that demonstrates xenon compensation of both self-focusing and self-phase modulation. This effect arises because KrF laser frequencies lie just above a two-photon resonance with the Xe 6p[1/2](0) state at 249.6 nm. The negative nonlinear index resulted in self-defocusing of 10 ps linearly-polarized 248.4 nm pulses in a 4.6 m cell at Xe pressures up to LOGO Torr. Numerical simulations of this defocusing at pressures up to 266 Torr yield a nonlinear index n(2)=-(2.06+/-0.14)x10(-14) esu for 760 Torr and 300 K, but the simulations fail to adequately reproduce the shapes of the measured profiles at pressures significantly above 266 Torr, In the compensation experiment, the cell was first filled up, to 1260 Torr with pure carbon dioxide, whose large positive n, resulted in self-focusing of the beam. A small amount of Xe was then added to the cell and allowed to mix with the CO2. Less than 130 Torr of Xe completely compensated the 1260 Torr of CO,, allowing both the spectrum and beam profile to be recovered. Numerical simulations of the self-focusing measurements yield a nonlinear index of (1.60+/-0.07)X10(-15) esu for CO2, and the compensation experiment gives n(2)(Xe)=-(1.82+/-0.08)X10(-14) esu at 760 Torr, 300 K, and 248.4 nm. The combined defocusing and compensation measurements give n(2)(Xe)=-(1.97+/-0.23)X10(-14) esu, in good agreement with our ab initio calculation of -(1.54+/-0.30)X10(-14) esu. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. ARTEP INC,COLUMBIA,MD 21045. UNIV MARYLAND,INST PLASMA RES,COLLEGE PK,MD 20742. RP LEHMBERG, RH (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 23 TC 19 Z9 19 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD NOV 15 PY 1995 VL 121 IS 1-3 BP 78 EP 88 DI 10.1016/0030-4018(95)00433-9 PG 11 WC Optics SC Optics GA TE039 UT WOS:A1995TE03900014 ER PT J AU CHEN, TJ ZITTER, RN TAO, R HUNTER, WR RIFE, JC AF CHEN, TJ ZITTER, RN TAO, R HUNTER, WR RIFE, JC TI OPTICAL-CONSTANTS OF LITHIUM TRIBORATE CRYSTALS IN THE 55-71 EV REGION SO PHYSICAL REVIEW B LA English DT Note ID ELECTRONIC-STRUCTURE; RADIATION; LIB3O5 AB The reflectances of lithium triborate (LBO) crystals in the range 55-71 eV have been measured and the principal values of the optical constants are derived. Five transitions in this spectral region are observed and their oscillator strengths and matrix elements [x],[y],[z] are determined. LBO is strongly anisotropic in this region and its energy levels are mainly determined by the Li ion. C1 SFA INC,LANDOVER,MD 20785. USN,RES LAB,WASHINGTON,DC 20375. RP CHEN, TJ (reprint author), SO ILLINOIS UNIV,DEPT PHYS,CARBONDALE,IL 62901, USA. OI Tao, Rongjia/0000-0001-5058-4401 NR 16 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 19 BP 13703 EP 13706 DI 10.1103/PhysRevB.52.13703 PG 4 WC Physics, Condensed Matter SC Physics GA TG780 UT WOS:A1995TG78000001 ER PT J AU KENNEDY, TA GLASER, ER KLEIN, PB BHARGAVA, RN AF KENNEDY, TA GLASER, ER KLEIN, PB BHARGAVA, RN TI SYMMETRY AND ELECTRONIC-STRUCTURE OF THE MN IMPURITY IN ZNS NANOCRYSTALS SO PHYSICAL REVIEW B LA English DT Note AB The symmetry and electronic structure of the Mn impurity in ZnS nanocrystals have been studied with electron paramagnetic resonance (EPR). Experiments were performed at 9 and 35 GHz on crystals with an average diameter of 35 Angstrom. Changes in the spectra over a period of months indicate a gradual degeneration of the passivating layer that separates individual nanocrystals. These changes allow for the deconvolution of the total EPR spectra into two independent spectra. The first has g = 2.003 and \A\ = 64.5 X 10(-4) cm(-1) This spectrum is dominated by Mn-Mn dipolar interactions and is similar to the spectrum of heavily Mn-doped, bulk ZnS. The second spectrum has g = 2.001 and \A\ = 89 X 10(-4) cm(-1) with axial-field splittings (D) from 0.05 to 0.10 cm(-1). This spectrum is associated with isolated Mn sites near the surface of a nanocrystal. The EPR results are discussed in relation to the previously published optical results. C1 NANOCRYSTALS TECHNOL,BRIARCLIFF MANOR,NY 10510. RP KENNEDY, TA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 132 Z9 132 U1 1 U2 20 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14356 EP 14359 PG 4 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200014 ER PT J AU BAYER, M DREMIN, AA KULAKOVSKII, VD FORCHEL, A FALLER, F KNIPP, PA REINECKE, TL AF BAYER, M DREMIN, AA KULAKOVSKII, VD FORCHEL, A FALLER, F KNIPP, PA REINECKE, TL TI COUPLING OF GEOMETRIC CONFINEMENT AND MAGNETIC CONFINEMENT IN IN0.09GA0.91AS/GAAS QUANTUM-WELLS IN MAGNETIC-FIELDS WITH VARYING ORIENTATIONS SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONAL ELECTRON-GAS; LANDAU-LEVEL; SPIN CONFIGURATIONS; CYCLOTRON-RESONANCE; FRACTIONAL CHARGE; GROUND-STATES; TRANSITION; LINESHAPE; SYSTEMS AB High excitation photoluminescence investigations of a 30-nm-wide In0.09Ga0.91As/GaAs quantum well have been performed in magnetic fields up to B = 10 T with varying orientations and have been compared with the results of detailed numerical calculations. The coupling between the quantum-well confinement potential and the magnetic confinement potential is controlled by the tilt angle 9 of the magnetic field relative to the quantum-well growth direction. For magnetic fields normal (u=O) and parallel (u=90 degrees) to the quantum-well plane the two confinement potentials are decoupled. In parallel orientation the magnetic quantization enhances only the geometric one. With increasing magnetic field the length scale that determines the quantization changes from the quantum-well width to the magnetic length. In contrast, in a normal magnetic field, B induces, independently of the geometric quantization, the in-plane Landau quantization. Spectral lines arising from intersubband transitions between Landau levels of different quantum-well subbands cross each other when they come close. For all other field orientations the two confinement potentials are coupled. This coupling generates hybridized electronic levels, in which both geometric and magnetic quantization are mixed. Transitions involving levels of different symmetry cross, whereas transitions involving levels of the same symmetry anticross when they approach each other. In addition, the number of strongly allowed transitions is increased near the anticrossing regime due to the exchange of character between the levels. C1 CHRISTOPHER NEWPORT UNIV,DEPT PHYS & COMP SCI,NEWPORT NEWS,VA 23606. USN,RES LAB,WASHINGTON,DC 20375. RP BAYER, M (reprint author), UNIV WURZBURG,D-97074 WURZBURG,GERMANY. RI Schaff, William/B-5839-2009; OI Forchel, Alfred/0000-0002-9377-9935 NR 36 TC 4 Z9 4 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14728 EP 14738 DI 10.1103/PhysRevB.52.14728 PG 11 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200066 ER PT J AU POREZAG, D PEDERSON, MR FRAUENHEIM, T KOHLER, T AF POREZAG, D PEDERSON, MR FRAUENHEIM, T KOHLER, T TI STRUCTURE, STABILITY, AND VIBRATIONAL PROPERTIES OF POLYMERIZED C-60 SO PHYSICAL REVIEW B LA English DT Article ID BUCKMINSTERFULLERENE; APPROXIMATION; SIMULATIONS; ACCURATE; SYSTEMS; FILMS AB We have applied a density-functional based nonorthogonal tight-binding (DF-TB) method to study the structure, energetics, and vibrational properties of five different [C-60](N) oligomers (N = 2, 3, and 4). In order to compare our results with the experimental spectra, Raman intensities have been calculated for each cluster using the bond polarization model. To address the energetics associated with polymer stability, we have calculated the DF-TB reaction barrier for the dissociation of the C-60 dimer along two different paths. The cohesive energy and the Raman-active interball mode of the C-60 dimer have been investigated with an all-electron, self-consistent density-functional based method also. C1 TECH UNIV CHEMNITZ,INST PHYS,D-09009 CHEMNITZ,GERMANY. RP POREZAG, D (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Frauenheim, Thomas/C-5653-2015 OI Frauenheim, Thomas/0000-0002-3073-0616 NR 25 TC 134 Z9 134 U1 0 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1995 VL 52 IS 20 BP 14963 EP 14970 DI 10.1103/PhysRevB.52.14963 PG 8 WC Physics, Condensed Matter SC Physics GA TH682 UT WOS:A1995TH68200094 ER PT J AU Hsu, DSY Troilo, LM Turner, NH Pierson, KW AF Hsu, DSY Troilo, LM Turner, NH Pierson, KW TI Selective area platinum silicide film deposition using a molecular precursor chemical beam source SO THIN SOLID FILMS LA English DT Article DE chemical vapour deposition; nucleation; platinum; silicides ID VAPOR-DEPOSITION; SIDEWALL LITHOGRAPHY; TUNGSTEN; COPPER; GROWTH; ALUMINUM; EPITAXY; ADSORPTION; POLYIMIDE; MECHANISM AB Selective area deposition of platinum silicide on exposed silicon areas of n-type, Si(100) substrates patterned with a polyimide resist has been demonstrated by using the thermal decomposition of the molecular precursor, Pt(PF3)(4), under chemical beam conditions. Selectivity was studied as a function of precursor partial pressure, substrate temperature and duration of deposition. Selectivity was most easily obtained at a precursor partial pressure of 1.33 x 10(-4) Pa, substrate temperature of 250 degrees C and deposition times ranging from 18 to 30 min. Atomic force microscopy, Auger electron spectroscopy, and X-ray photoelectron spectroscopy analyses of selectively deposited films strongly suggested the complete interdiffusion of Si and Pt. Speculations on possible mechanisms for selectivity are discussed. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. UNIV WISCONSIN,DEPT PHYS & ASTRON,EAU CLAIRE,WI 54702. RP Hsu, DSY (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. NR 48 TC 4 Z9 4 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 15 PY 1995 VL 269 IS 1-2 BP 21 EP 28 DI 10.1016/0040-6090(95)06866-X PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA TM389 UT WOS:A1995TM38900005 ER PT J AU GOLDBERG, L BURNS, WK MCELHANON, RW AF GOLDBERG, L BURNS, WK MCELHANON, RW TI WIDE ACCEPTANCE BANDWIDTH DIFFERENCE-FREQUENCY-GENERATION IN QUASI-PHASE-MATCHED LINBO3 SO APPLIED PHYSICS LETTERS LA English DT Article ID AGGAS2; LASER AB Difference frequency generation in quasi-phase-matched LiNbO3 is carried out using a Nd:YAG laser and a high power semiconductor laser. Operation at quasi-phase-matching degeneracy point results in an ultrawide 0.5 mu m acceptance bandwidth. Crystal-rotation-free wavelength tuning of 4.0-4.5 mu m, with 0.2 mW output power at 4.5 mu m is achieved. Separately, a tuning range 3.0-5.5 mu m is demonstrated with sample rotation and a Ti:Al2O3 laser. (C) 1995 American Institute of Physics. C1 MARYLAND ADV DEV LAB,GREENBELT,MD 20770. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 30 Z9 31 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 13 PY 1995 VL 67 IS 20 BP 2910 EP 2912 DI 10.1063/1.114839 PG 3 WC Physics, Applied SC Physics GA TE385 UT WOS:A1995TE38500004 ER PT J AU KRUSHELNICK, K TING, A BURRIS, HR FISHER, A MANKA, C ESAREY, E AF KRUSHELNICK, K TING, A BURRIS, HR FISHER, A MANKA, C ESAREY, E TI 2ND-HARMONIC GENERATION OF STIMULATED RAMAN SCATTERED-LIGHT IN UNDERDENSE PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID 2ND-HARMONIC EMISSION; LASER-PULSES; FILAMENTATION AB Experiments examining nonlinear scattering mechanisms of high intensity (2 X 10(18) W/cm(2)) laser light in underdense plasmas were performed. Redshifted second harmonic emission at 45 degrees from the directly backscatterd direction was observed from field ionized plasmas having electron densities ranging up to 10(19) cm(-3). This result is consistent with the doubling of stimulated Raman scattered light from large plasma electron density gradients produced by ponderomotive cavitation. C1 CORNELL UNIV,PLASMA STUDIES LAB,ITHACA,NY 14853. RP KRUSHELNICK, K (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 22 TC 45 Z9 48 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 13 PY 1995 VL 75 IS 20 BP 3681 EP 3684 DI 10.1103/PhysRevLett.75.3681 PG 4 WC Physics, Multidisciplinary SC Physics GA TE363 UT WOS:A1995TE36300023 ER PT J AU NIRMAL, M NORRIS, DJ KUNO, M BAWENDI, MG EFROS, AL ROSEN, M AF NIRMAL, M NORRIS, DJ KUNO, M BAWENDI, MG EFROS, AL ROSEN, M TI OBSERVATION OF THE DARK EXCITON IN CDSE QUANTUM DOTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SIZE DEPENDENCE; ELECTRON; LUMINESCENCE; ABSORPTION; CRYSTALLITES; TRANSITIONS; STATES AB We use external magnetic fields to identify the band edge emitting state in CdSe quantum dots. The field dependence of emission decays and LO phonon spectra show the importance of exciton spin dynamics in the recombination mechanism. To interpret our results we calculate the band edge exciton structure, including the effects of the electron-hole exchange interaction and a nonspherical shape. The exchange term, negligible in the bulk, is strongly enhanced by quantum confinement and allows the observation of an optically passive ''dark'' excitonic state. C1 USN,RES LAB,BEAM THEORY SECT,WASHINGTON,DC 20375. RP NIRMAL, M (reprint author), MIT,77 MASSACHUSETTS AVE,CAMBRIDGE,MA 02139, USA. RI Norris, David/F-4022-2010; Kuno, Masaru/K-2673-2012 NR 24 TC 550 Z9 556 U1 6 U2 69 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 13 PY 1995 VL 75 IS 20 BP 3728 EP 3731 DI 10.1103/PhysRevLett.75.3728 PG 4 WC Physics, Multidisciplinary SC Physics GA TE363 UT WOS:A1995TE36300035 ER PT J AU SOEPRAPTO, W ERTONO, S HUDOYO, H MASCOLA, J PORTER, K GUNAWAN, S CORWIN, A AF SOEPRAPTO, W ERTONO, S HUDOYO, H MASCOLA, J PORTER, K GUNAWAN, S CORWIN, A TI HIV AND PEACEKEEPING OPERATIONS IN CAMBODIA SO LANCET LA English DT Letter C1 ARMY HEADQUARTERS,DIRECTORATE HLTH,JAKARTA,INDONESIA. P2LP CDC,JAKARTA,INDONESIA. USN,MED RES INST,BETHESDA,MD. MINIST HLTH,NATL INST HLTH RES & DEV,JAKARTA,INDONESIA. USN,MED RES UNIT 2,WASHINGTON,DC 20350. RP SOEPRAPTO, W (reprint author), GATOT SUBROTO ARMY HOSP,J1 ABDULRACHMAN SALEH 24 JAKARTA PUSAT,JAKARTA,INDONESIA. NR 4 TC 15 Z9 16 U1 0 U2 0 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0099-5355 J9 LANCET JI Lancet PD NOV 11 PY 1995 VL 346 IS 8985 BP 1304 EP 1305 DI 10.1016/S0140-6736(95)91910-4 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA TE145 UT WOS:A1995TE14500066 PM 7475754 ER PT J AU KEENAN, FP FOSTER, VJ DRAKE, JJ TAYAL, SS WIDING, KG AF KEENAN, FP FOSTER, VJ DRAKE, JJ TAYAL, SS WIDING, KG TI EXTREME-ULTRAVIOLET EMISSION-LINES OF FE-XIII IN SOLAR AND STELLAR SPECTRA SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN, FLARES; SUN, UV RADIATION; ULTRAVIOLET, STARS ID XUV OBSERVATIONS; FORBIDDEN LINES; COMPACT FLARE; ENERGY-LEVELS; STRENGTHS; RATIOS; SKYLAB; SUN; IRON AB Recent R-matrix calculations of electron impact excitation rates for Fe XIII are used to derive the theoretical electron density sensitive emission line ratios R(1) = I(3s(2)3p(2 1)D-3s3p(3 1)D)/I(3s(2 3)p(2) 3P(2)-3s3p(3) 3P(2)) = I(318.12 Angstrom)/I(320.80 Angstrom) and R(2) = I(3s(2)3p(2 1)D-3s3p(3 1)P)/I(3s(2)2p(2 3)P(2)-3s3p(3 3)S) = I(256.42 Angstrom)/I(251.95 Angstrom), which are found to be up to 70% different from earlier diagnostics. A comparison of the current line ratios with both solar flare and active region observations, obtained by the Naval Research Laboratory's S082A spectrograph on board Skylab, reveals generally good agreement between densities deduced from Fe XIII and those estimated from diagnostic line ratios in species formed at similar temperatures, such as I(219.12 Angstrom)/I(211.32 Angstrom) in Fe XIV. This provides experimental support for the accuracy of the line ratio calculations, and hence the atomic data adopted in their derivation. In Extreme Ultraviolet Explorer satellite (EUVE) spectra the Fe XIII emission lines are found to be severely blended. However, an analysis of these lines measured in the spectra of Procyon and alpha Cen demonstrates that they still allow very approximate values of the electron density to be inferred. Moreover, it should be possible to increase the accuracy of the measured line fluxes, and hence of the inferred densities, if longer exposures of the stars concerned can be obtained. C1 UNIV CALIF BERKELEY, CTR EUV ASTROPHYS, BERKELEY, CA 94720 USA. CLARK ATLANTA UNIV, DEPT PHYS, ATLANTA, GA 30314 USA. CLARK ATLANTA UNIV, CTR THEORET STUDIES PHYS SYST, ATLANTA, GA 30314 USA. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST, DEPT PURE & APPL PHYS, BELFAST BT7 1NN, ANTRIM, NORTH IRELAND. NR 41 TC 9 Z9 9 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1995 VL 453 IS 2 BP 906 EP 910 DI 10.1086/176450 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TC992 UT WOS:A1995TC99200036 ER PT J AU GEER, RE THIBODEAUX, KF DURAN, RS SHASHIDHAR, R AF GEER, RE THIBODEAUX, KF DURAN, RS SHASHIDHAR, R TI INTERFACIAL STRUCTURE AND CORRELATIONS IN FINITE-SIZED LIQUID-CRYSTALLINE POLYMER-FILMS SO EUROPHYSICS LETTERS LA English DT Article ID X-RAY REFLECTIVITY; MULTILAYER FILMS; DIFFRACTION; SCATTERING; ROUGHNESS AB A quantitative study of the structure and correlation of individual layer interfaces in a liquid-crystalline polymer multilayer film is reported. Off-specular and specular X-ray scattering data on successively deposited Langmuir-Blodgett films of the polymer show that the roughness of the first and subsequently deposited smectic layers is directly correlated with that of the chemisorbed hydrophobization layer and not correlated with the underlying silicon substrate. C1 UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. RP GEER, RE (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 16 TC 3 Z9 3 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD NOV 10 PY 1995 VL 32 IS 5 BP 419 EP 424 DI 10.1209/0295-5075/32/5/007 PG 6 WC Physics, Multidisciplinary SC Physics GA TF888 UT WOS:A1995TF88800007 ER PT J AU VOLPANO, D SMITH, G AF VOLPANO, D SMITH, G TI A TYPE SOUNDNESS PROOF FOR VARIABLES IN LCF-ML SO INFORMATION PROCESSING LETTERS LA English DT Article DE TYPE THEORY; FORMAL SEMANTICS; VARIABLES AND ASSIGNMENT AB We prove the soundness of a polymorphic type system for a language with variables, assignments, and first-class functions. As a corollary, this proves the soundness of the Edinburgh LCF ML rules for typing variables and assignments, thereby settling a long-standing open problem. C1 FLORIDA INT UNIV,SCH COMP SCI,MIAMI,FL 33199. RP VOLPANO, D (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943, USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0020-0190 J9 INFORM PROCESS LETT JI Inf. Process. Lett. PD NOV 10 PY 1995 VL 56 IS 3 BP 141 EP 146 DI 10.1016/0020-0190(95)00146-4 PG 6 WC Computer Science, Information Systems SC Computer Science GA TE025 UT WOS:A1995TE02500004 ER PT J AU GOLDSTEIN, D HANDLER, R SIROVICH, L AF GOLDSTEIN, D HANDLER, R SIROVICH, L TI DIRECT NUMERICAL-SIMULATION OF TURBULENT-FLOW OVER A MODELED RIBLET COVERED SURFACE SO JOURNAL OF FLUID MECHANICS LA English DT Article ID 3-DIMENSIONAL COMPUTATIONAL METHOD; BLOOD-FLOW; CHANNEL FLOW; REYNOLDS-NUMBER; DRAG REDUCTION; BOUNDARY-LAYER; HEART-VALVES; LAMINAR; FIBERS; FLUID AB An immersed boundary technique is used to model a riblet covered surface on one wall of a channel bounding fully developed turbulent flow. The conjecture that the beneficial drag reduction effect of riblets is a result of the damping of cross-flow velocity fluctuations is then examined. This possibility has been discussed by others but is unverified. The damping effect is explicitly modelled by applying a crossflow damping force field in elongated streamwise zones with a height and spacing corresponding to the riblet crests. The same trends are observed in the turbulence profiles above both riblet and damped surfaces, thus supporting cross-flow damping as a beneficial mechanism. It is found in the examples presented that the effect of the riblets on the mean flow field quantities (mean velocity profile, velocity fluctuations, Reynolds shear stress, and low-speed streak spacing) is small. The riblets cause a relatively small drag reduction of about 4%, a figure that is in rough agreement with experiments and other computations. The simulations also suggest a mechanism for the observed displacement of the turbulence quantities away from the wall. The immersed boundary technique used to model the riblets consists of creating an externally imposed spatially localized body force which opposes the flow velocity and creates a riblet-like surface. For unsteady viscous flow the calculation of the force is done with a feedback scheme in which the velocity is used to iteratively determine the desired value. In particular, the surface body force is determined by the relation f(x(s),t) = alpha integral(0)(t)U(x(s),t')dt' + beta U(x(s),t) for surface points x(s), velocity U, time t and negative constants alpha and beta. All simulations are done with a spectral code in a single computational domain without any mapping of the mesh. The combination of the immersed boundary and spectral techniques can potentially be used to solve other problems having complex geometry and flow physics. C1 BROWN UNIV, CTR FLUID MECH, PROVIDENCE, RI 02912 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. NR 61 TC 99 Z9 102 U1 2 U2 27 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD NOV 10 PY 1995 VL 302 BP 333 EP 376 DI 10.1017/S0022112095004125 PG 44 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA TG213 UT WOS:A1995TG21300015 ER PT J AU PINTO, JF ESTEROWITZ, L QUARLES, GJ AF PINTO, JF ESTEROWITZ, L QUARLES, GJ TI HIGH-PERFORMANCE CE3+LISRALF6/LICAALF6 UV LASERS WITH EXTENDED TUNABILITY SO ELECTRONICS LETTERS LA English DT Article DE SOLID-STATE LASERS; UV LASERS AB Improved gain-switched laser operation of cerium-doped LiCaAlF6 (Ce3+:LiCAF) and LiSrAlF6 (Ce3+:LiSAF) crystals is described. Pumping with the quadrupled Nd:YAG laser at 266nm, the Ce3+:LiCAF laser delivers an output energy of 10.2 mJ at an operating wavelength of 288 nm, with a corresponding slope efficiency of 28%, and tunability from 281 to 315nm. For the Ce3+:LiSAF laser, an energy of 5.4 mJ at 290nm, slope efficiency of 16%, and tuning range extending from 283 - 313 nm are obtained. C1 LIGHTNING OPT CORP,TARPON SPRINGS,FL 34689. RP PINTO, JF (reprint author), USN,RES LAB,CODE 5641,WASHINGTON,DC 20375, USA. NR 4 TC 30 Z9 31 U1 0 U2 2 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD NOV 9 PY 1995 VL 31 IS 23 BP 2009 EP 2011 DI 10.1049/el:19951395 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA TF163 UT WOS:A1995TF16300032 ER PT J AU CAMPBELL, ML MCCLEAN, RE AF CAMPBELL, ML MCCLEAN, RE TI TEMPERATURE-DEPENDENT STUDIES OF THE REACTION OF W(A D-5(J), A S-7(3)) WITH O-2 SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article ID TRANSITION-METAL ATOMS; CHEMICAL VAPOR-DEPOSITION; GAS-PHASE; OXIDATION REACTIONS; KINETICS; N2O; NO; TI(A3F); 300-K; CVD AB The gas-phase reactivities of W(a(5)D(J), a(7)S(3)) with O-2 in the temperature range 298-573 K are reported. Tungsten atoms were produced by the photodissociation of W(CO)(6) and detected by laser-induced fluorescence. The disappearance rate constant of the s(1)d(5)a(7)S(3) state is of the order of the gas kinetic rate constant. The removal rate constants for the s(2)d(4)a(5)D(J) states are J dependent. The a(5)D(J) states are not as reactive as the s(1)d(5)a(7)S(3) state and are found to be temperature dependent. The disappearance rates of all states in the presence of O-2 are found to be pressure independent with buffer gas. Physical quenching rate constants for the excited states in the presence of Ar, He, N-2, and SF6 are also reported. Results are discussed in terms of the different electron configurations of the states. RP CAMPBELL, ML (reprint author), USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402, USA. NR 27 TC 40 Z9 40 U1 0 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD NOV 7 PY 1995 VL 91 IS 21 BP 3787 EP 3793 DI 10.1039/ft9959103787 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA TC834 UT WOS:A1995TC83400009 ER PT J AU MEYER, JR HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR AF MEYER, JR HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR TI INFRARED ELECTROOPTICAL MODULATORS BASED ON FIELD-INDUCED GAMMA-L INTERVALLEY TRANSFER SO APPLIED PHYSICS LETTERS LA English DT Article ID DOUBLE-QUANTUM-WELLS; INTERSUBBAND ABSORPTION; TRANSITIONS; PHOTODETECTORS; SUPERLATTICES AB Electro-optical modulators based on intersubband transitions induced by normal-incidence radiation in GaSb-AlSb-family asymmetric double quantum wells are proposed. An applied field transfers electrons from Gamma-valley states in one well to L-valley states in the other well, thereby radically altering the selection rules, resonance energies, and in-plane effective masses. (C) 1995 American Institute of Physics. C1 WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP MEYER, JR (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. RI Ram-Mohan, Ramdas/C-5167-2012 NR 17 TC 9 Z9 9 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 6 PY 1995 VL 67 IS 19 BP 2756 EP 2758 DI 10.1063/1.114583 PG 3 WC Physics, Applied SC Physics GA TC985 UT WOS:A1995TC98500002 ER PT J AU ANTONSEN, TM NAMENSON, A OTT, E SOMMERER, JC AF ANTONSEN, TM NAMENSON, A OTT, E SOMMERER, JC TI POWER-LAW WAVE-NUMBER SPECTRA OF SCUM ON THE SURFACE OF A FLOWING FLUID SO PHYSICAL REVIEW LETTERS LA English DT Article ID TRANSITION; DYNAMICS; SYSTEMS; CHAOS AB An initial cloud of particles floating on the surface of a flowing fluid will often tend to a fractal pattern. If the wave-number spectrum of the pattern has an observable power law dependence k(-rho) then the exponent rho is predicted to be rho = D-2 - 1, where D-2 is the correlation dimension of the fractal attractor. Numerical, experimental, and theoretical results are shown to support this prediction, but it is also found that, when the observable range in k is limited, the predicted power law scaling can be obscured by fluctuations in the k spectrum. The expected behavior can, however, be restored by use of averaging. C1 USN,RES LAB,WASHINGTON,DC 20375. JOHNS HOPKINS UNIV,APPL PHYS LAB,MS EISENHOWER RES CTR,LAUREL,MD 20723. RP ANTONSEN, TM (reprint author), UNIV MARYLAND,DEPT PHYS & ELECT ENGN,COLLEGE PK,MD 20742, USA. RI O, E/F-1630-2015; Antonsen, Thomas/D-8791-2017 OI Antonsen, Thomas/0000-0002-2362-2430 NR 16 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 6 PY 1995 VL 75 IS 19 BP 3438 EP 3441 PG 4 WC Physics, Multidisciplinary SC Physics GA TC975 UT WOS:A1995TC97500016 ER PT J AU FRYAUFF, DJ BAIRD, JK BASRI, H SUMAWINATA, I PURNOMO RICHIE, TL OHRT, CK MOUZIN, E CHURCH, CJ RICHARDS, AL SUBIANTO, B SANDJAJA, B WIGNALL, FS HOFFMAN, SL AF FRYAUFF, DJ BAIRD, JK BASRI, H SUMAWINATA, I PURNOMO RICHIE, TL OHRT, CK MOUZIN, E CHURCH, CJ RICHARDS, AL SUBIANTO, B SANDJAJA, B WIGNALL, FS HOFFMAN, SL TI RANDOMIZED PLACEBO-CONTROLLED TRIAL OF PRIMAQUINE FOR PROPHYLAXIS OF FALCIPARUM AND VIVAX MALARIA SO LANCET LA English DT Article ID CHLOROQUINE; PREVENTION AB Drug resistance has made malaria prevention difficult and the new agents are too expensive for widespread use, Primaquine, an established drug for treatment, is potentially useful for prevention, Malaria prophylaxis with primaquine was evaluated in Irian Jaya during one year in Javanese men who were not deficient in glucose-6-phosphate dehydrogenase (G-6-PD). 126 volunteers were randomised to receive 0 . 5 mg/hg primaquine base or placebo daily (double-blinded), or 300 mg chloroquine base weekly (open). The protective efficacy of primaquine relative to placebo was 94 . 5% (95% confidence interval 57-99) for Plasmodium falciparum and 90 . 4% (95% CI 58-98) for P vivax, Attack rates for either parasite did not differ significantly between the chloroquine and placebo groups. Incidence density of physical complaints not associated with parasitaemia was low (17-18 complaints/person-year) and was about the same in all groups except for cough, which was increased in the primaquine group. Complete blood counts were normal and no evidence of hepatic or renal dysfunction was found with primaquine. However, at 50 weeks the primaquine group had a mean methaemoglobin of 5 . 8% (range 1 . 4-13%), which declined by half within 7 days of ending prophylaxis. When used daily for one year by men with normal G-6-PD activity, primaquine was well tolerated and effective for prevention of malaria. C1 USN,MED RES UNIT 2,JAKARTA,INDONESIA. TULANE UNIV,MED CTR,DEPT MED,NEW ORLEANS,LA 70112. ARMED FORCES RES INST MED SCI,BANGKOK,THAILAND. PROV HLTH SERV,IRIAN JAYA,INDONESIA. USN,MED RES INST,BETHESDA,MD. NR 21 TC 112 Z9 113 U1 1 U2 4 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0099-5355 J9 LANCET JI Lancet PD NOV 4 PY 1995 VL 346 IS 8984 BP 1190 EP 1193 DI 10.1016/S0140-6736(95)92898-7 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA TC976 UT WOS:A1995TC97600008 PM 7475658 ER PT J AU BRODINE, SK MASCOLA, JR WEISS, PJ ITO, SI PORTER, KR ARTENSTEIN, AW GARLAND, FC MCCUTCHAN, FE BURKE, DS AF BRODINE, SK MASCOLA, JR WEISS, PJ ITO, SI PORTER, KR ARTENSTEIN, AW GARLAND, FC MCCUTCHAN, FE BURKE, DS TI DETECTION OF DIVERSE HIV-1 GENETIC SUBTYPES IN THE USA SO LANCET LA English DT Note AB Of the nine genetic subtypes of HIV-1 that exist world wide, subtype B predominates in North America and Europe. Thus, most knowledge about HIV-1 and most vaccine development efforts are based on subtype B viruses. We document here the detection of HIV-1 subtypes A, D, and E in five US servicemen who acquired these non-subtype-B infections during overseas deployments. The dispersal of diverse HIV-1 subtypes into regions of the world with previously restricted genetic diversity may have important implications for the epidemiology of the epidemic and for the design and implementation of vaccine trials. C1 USN,MED RES INST,DEPT INFECT DIS,BETHESDA,MD. WALTER REED ARMY INST RES,DIV RETROVIROL,ROCKVILLE,MD. USN,MED CTR,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92152. HENRY M JACKSON FDN,ROCKVILLE,MD. RP BRODINE, SK (reprint author), USN,HLTH RES CTR,DIV CLIN EPIDEMIOL,DEPT HLTH SCI & EPIDEMIOL,SAN DIEGO,CA 92186, USA. OI /0000-0002-5704-8094 NR 10 TC 123 Z9 123 U1 0 U2 1 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0099-5355 J9 LANCET JI Lancet PD NOV 4 PY 1995 VL 346 IS 8984 BP 1198 EP 1199 DI 10.1016/S0140-6736(95)92901-0 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA TC976 UT WOS:A1995TC97600011 PM 7475661 ER PT J AU HUNT, J BYRNS, RE IGNARRO, LJ GASTON, B AF HUNT, J BYRNS, RE IGNARRO, LJ GASTON, B TI CONDENSED EXPIRATE NITRITE AS A HOME MARKER FOR ACUTE ASTHMA SO LANCET LA English DT Letter ID OXIDE C1 USN,MED CTR,DEPT PEDIAT,SAN DIEGO,CA 92134. UNIV CALIF LOS ANGELES,SCH MED,DEPT PHARMACOL,LOS ANGELES,CA 90024. NR 5 TC 66 Z9 71 U1 0 U2 3 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0099-5355 J9 LANCET JI Lancet PD NOV 4 PY 1995 VL 346 IS 8984 BP 1235 EP 1236 DI 10.1016/S0140-6736(95)92947-9 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA TC976 UT WOS:A1995TC97600059 PM 7475695 ER PT J AU ARTHUR, RR IMAM, IZ SAAD, MD HACKBART, BG MOSSAD, SB AF ARTHUR, RR IMAM, IZ SAAD, MD HACKBART, BG MOSSAD, SB TI HCV IN EGYPT IN 1977 SO LANCET LA English DT Letter ID C VIRUS-INFECTION; HEPATITIS-C; BLOOD-DONORS C1 CLEVELAND CLIN FDN,CLEVELAND,OH 44195. RP ARTHUR, RR (reprint author), USN,MED RES UNIT 3,VIROL BRANCH,CAIRO,EGYPT. RI Saad, Magdi/H-5561-2013 OI Saad, Magdi/0000-0003-2111-8115 NR 4 TC 6 Z9 6 U1 0 U2 0 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0099-5355 J9 LANCET JI Lancet PD NOV 4 PY 1995 VL 346 IS 8984 BP 1239 EP 1240 DI 10.1016/S0140-6736(95)92953-3 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA TC976 UT WOS:A1995TC97600069 PM 7475705 ER PT J AU NEWTON, JA TASKER, SA BONE, WD OLDFIELD, EC OLSON, PE NGUYEN, MT WALLACE, MR AF NEWTON, JA TASKER, SA BONE, WD OLDFIELD, EC OLSON, PE NGUYEN, MT WALLACE, MR TI WEEKLY FLUCONAZOLE FOR THE SUPPRESSION OF RECURRENT THRUSH IN HIV-SEROPOSITIVE PATIENTS - IMPACT ON THE INCIDENCE OF DISSEMINATED CRYPTOCOCCAL INFECTION SO AIDS LA English DT Letter ID ACQUIRED-IMMUNODEFICIENCY-SYNDROME; DOUBLE-BLIND; OROPHARYNGEAL CANDIDIASIS; MENINGITIS; AIDS; COMPLEX C1 USN, DEPT INTERNAL MED, DIV INFECT DIS, SAN DIEGO, CA 92152 USA. EASTERN VIRGINIA MED SCH, DEPT INTERNAL MED, DIV INFECT DIS, NORFOLK, VA 23501 USA. USN, MED CTR, DEPT PHARM & CLIN INVEST, SAN DIEGO, CA 92152 USA. RP NEWTON, JA (reprint author), USN, MED CTR, DEPT INTERNAL MED, DIV INFECT DIS, PORTSMOUTH, VA 23708 USA. NR 10 TC 19 Z9 20 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0269-9370 EI 1473-5571 J9 AIDS JI Aids PD NOV PY 1995 VL 9 IS 11 BP 1286 EP 1287 DI 10.1097/00002030-199511000-00012 PG 2 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA TB674 UT WOS:A1995TB67400012 PM 8561984 ER PT J AU GRATE, JW MCGILL, RA AF GRATE, JW MCGILL, RA TI DEWETTING EFFECTS ON POLYMER-COATED SURFACE-ACOUSTIC-WAVE VAPOR SENSORS SO ANALYTICAL CHEMISTRY LA English DT Note ID PATTERN-RECOGNITION; DEVICES; RESPONSES; MICROSENSORS; COATINGS; DYNAMICS; FILMS AB Thin polymer films on surface acoustic wave device surfaces sometimes dewet the surface, leading to isolated droplets of material and a degradation in sensor performance. Dewetting has been observed to lead to decreases in baseline operating frequencies and loss of oscillation in the worst cases. The influence of surface precleaning methods has been examined, and, in general, plasma cleaning was found to be the method of choice for the preparation of the device surface for polymer application. Plasma cleaning results in an increase in the surface free energy and improves polymer adhesion so that dewetting is disfavored. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 31 TC 54 Z9 54 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 1 PY 1995 VL 67 IS 21 BP 4015 EP 4019 DI 10.1021/ac00117a031 PG 5 WC Chemistry, Analytical SC Chemistry GA TC809 UT WOS:A1995TC80900036 ER PT J AU WATERS, JH SCANLON, TS HOWARD, RS LEIVERS, D AF WATERS, JH SCANLON, TS HOWARD, RS LEIVERS, D TI ROLE OF MINOR ELECTROLYTES WHEN APPLIED TO STEWARTS ACID-BASE APPROACH IN AN ACIDOTIC RABBIT MODEL SO ANESTHESIA AND ANALGESIA LA English DT Article ID SERUM-PROTEINS; EQUILIBRIA; CHEMISTRY AB Current clinical practice regarding acid-base balance is derived from the traditional Henderson-Hasselbalch equation. An alternate theory, developed by Stewart, relates hydrogen ion concentration ([H+]) changes to three independent variables: the strong ion difference, weak acids, and Pco(2). The insight into acid-base balance gained by this approach has potentially important clinical applications. To test the theory in vivo, electrolyte and blood gas values were measured in rabbits subjected to a period of hypoxia sufficient to produce a severe metabolic acidosis, followed by a period of reoxygenation. These variables were used to calculate [H+] by Stewart's original formula, which was tl;en compared td the measured value. A high correlation was found between measured and calculated values for a pH range of 7.3-7.6; however, progressive deterioration in correlation was observed outside this range. perhaps the presence of an unidentified anion, thought to be phosphate, causes a breakdown in the accuracy of Stewart's formula at pH extremes. The addition of phosphate values to the calculation, along with calcium and magnesium, restored the agreement throughout the physiologic range. To make the formula clinically applicable, modification to incorporate phosphate levels is required to achieve the necessary accuracy in biologic solutions at more acidemic pH ranges. C1 USN,CTR MED,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. RP WATERS, JH (reprint author), USN,CTR MED,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 17 TC 11 Z9 11 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD NOV PY 1995 VL 81 IS 5 BP 1043 EP 1051 DI 10.1097/00000539-199511000-00026 PG 9 WC Anesthesiology SC Anesthesiology GA TC519 UT WOS:A1995TC51900026 PM 7486045 ER PT J AU ABBASSY, MM HELMY, N OSMAN, M COPE, SE PRESLEY, SM AF ABBASSY, MM HELMY, N OSMAN, M COPE, SE PRESLEY, SM TI EMBRYOGENESIS OF THE SAND FLY PHLEBOTOMUS-PAPATASI (DIPTERA, PSYCHODIDAE) - CELL CLEAVAGE, BLASTODERM FORMATION, AND GASTRULATION SO ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA LA English DT Article DE DIPTERA; PHLEBOTOMUS PAPATASI; EMBRYOGENESIS; BLASTODERM; GASTRULATION ID VECTORS; EGYPT AB Serial sections of dechorionated eggs were used to study the early embryology of the sand fly Phlebotomus paptasi (Scopoli) up to 96 h. Cleavage began between oviposition and the first 12, h and continued until the cellular blastoderm was formed (60 h). Cleavage was synchronous, with most cleavage processes occurring during the first 36 h. Anterior-to-posterior cellular growth became apparent until division temporarily ceased. Cleavage nuclei were observed Ist in the anterior 1/3 of the egg and, as they developed, became more evenly distributed into the periplasm. Primary vitellophages concentrated linearly in the center of the egg started migrating posteriorly, and a few secondary vitellophages appeared at the posterior pole. Approximately 6-10 pole cells originated from the blastoderm and were formed at the posterior extremity. At 48 h, delimiting cell furrows first became evident, jutting inward from the outer periplasmic membrane between the nuclei, and continued until 60 h. Invagination of the germ band occurred 72 h after oviposition and spread bilaterally as paired ventrolateral mesodermal bands. The stomodeum and the anterior midgut invaginated simultaneously at 72-84 h. Formation and invagination of stomodeal cells preceded that of the proctodeum. The proctodeal invagination began at 84 h, enclosing the pole cells, which migrated from the posterior pole to the dorsal side of the egg. Invagination of the pole cells appeared in association with the invaginating posterior midgut proctodeal complex. The amnion and serosa became a loosely attached layer of cells clumped to form a primary dorsal organ, which underwent lysis at 84 h and was totally resorbed into the yolk by 96 h. RP ABBASSY, MM (reprint author), USN,MED RES UNIT 3,MED ZOOL BRANCH,PSC 452,BOX 5000,FPO,AE 09835, USA. NR 19 TC 5 Z9 5 U1 0 U2 1 PU ENTOMOL SOC AMER PI LANHAM PA 9301 ANNAPOLIS RD, LANHAM, MD 20706 SN 0013-8746 J9 ANN ENTOMOL SOC AM JI Ann. Entomol. Soc. Am. PD NOV PY 1995 VL 88 IS 6 BP 809 EP 814 PG 6 WC Entomology SC Entomology GA TH782 UT WOS:A1995TH78200015 ER PT J AU ABBASSY, MM HELMY, N OSMAN, M COPE, SE PRESLEY, SM AF ABBASSY, MM HELMY, N OSMAN, M COPE, SE PRESLEY, SM TI EMBRYOGENESIS OF THE SAND FLY PHLEBOTOMUS-PAPATASI (DIPTERA, PSYCHODIDAE) - ORGANOGENESIS INCLUDING SEGMENTATION, BLASTOKINESIS, MOUTHPARTS, AND ALIMENTARY CANAL SO ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA LA English DT Article DE DIPTERA; PHLEBOTOMUS PAPATASI; EMBRYOGENESIS; ORGANOGENESIS AB The embryo of the sand fly Phlebotomus papatasi (Scopoli) consists of 17 units (the blastocephalon, 3 gnathal units, 3 thoracic, and 10 abdominal units) within the first 96 h of development. Shortening of the germ band starts at 108 h, and by 132 h it is completely the withdrawn onto the ventral side of the egg. Anterior migration of the mouthparts is also associated with germ band movement. Formation of the labrum starts at 96 h, and by 120 h it appears as a distinct lobe. Antennal rudiments are evident at 96 h. Mandibles and maxillae are recognizable by 108 h, and a labium can be seen at 120 h. Blastokinesis occurs between 120 and 132 h. Stomodeal and proctodeal invaginations are observed at 84 h as infoldings of the blastocephalon and the terminal segment, respectively. The stomodeum differentiates into the preoral cavity, diverticulum, pharynx, and esophagus between 120 and 144 h and forms the proventriculus by 168 h. Development of the proctodeum begins at 120 h, and the pyloric ampulla, the ileum, and the colon are discernible at 168 h. Cells at the tip of the stomodeal-anterior midgut and the proctodeal-posterior midgut invaginate to form the midgut proper, which appears as a closed tube by 156 h. The gastric caecae originate from the midgut at its junction with the foregut by 180 h. The malpighian tubules arise from the anterior end of the proctodeum between 132 and 156 h. Anal papillae arise from the posterior end of the proc todeum at 168 h. RP ABBASSY, MM (reprint author), USN,MED RES UNIT 3,MED ZOOL BRANCH,PSC 452,BOX 5000,FPO,AE 09835, USA. NR 14 TC 4 Z9 4 U1 1 U2 1 PU ENTOMOL SOC AMER PI LANHAM PA 9301 ANNAPOLIS RD, LANHAM, MD 20706 SN 0013-8746 J9 ANN ENTOMOL SOC AM JI Ann. Entomol. Soc. Am. PD NOV PY 1995 VL 88 IS 6 BP 815 EP 820 PG 6 WC Entomology SC Entomology GA TH782 UT WOS:A1995TH78200016 ER PT J AU ABBASSY, MM HELMY, N OSMAN, M COPE, SE PRESLEY, SM AF ABBASSY, MM HELMY, N OSMAN, M COPE, SE PRESLEY, SM TI EMBRYOGENESIS OF THE SAND FLY PHLEBOTOMUS-PAPATASI (DIPTERA, PSYCHODIDAE) - ORGANOGENESIS OF THE NERVOUS-SYSTEM, TRACHEAL SYSTEM, MUSCULAR SYSTEM, HEART, AND GONAD RUDIMENTS SO ANNALS OF THE ENTOMOLOGICAL SOCIETY OF AMERICA LA English DT Article DE DIPTERA; PHLEBOTOMUS PAPATASI; EMBRYOGENESIS AB Formation of the embryonic brain of the sand fly Phlebotomus papatasi (Scopoli) starts at 108 h after oviposition with proliferation of the ectodermal cells in the posterior region of the blastocephalon. Within 156 h, the brain is completely formed. The subesophageal ganglion is formed by 156 h. The basic form of the ventral nerve cord is initiated at 84 h with migration of the neuroblasts from the ectodermal layer. These cells form the ganglionic lobes, which become fully differentiated by 156 h and form a chain of 3 thoracic and 8 abdominal ganglia. Eye rudiments appear at 132 h and become fully differentiated by 156 h. Cuticle surrounding all appendages and body segments is secreted by ectodermal cells between 132 and 168 h. Rudiments of the tracheal system begin to differentiate at 120 h, becoming well-defined tracheae and longitudinal trunks by 168 h. Formation of the musculature of the gnathal segments begins at 144 h and is completed during the course of embryogeny The true musculature is formed from the somatic mesoderm, which also gives rise to the heart. The ventral and dorsal longitudinal muscles begin to form at 132 h and are completed by 168 h. A tubular heart is seen at 168 h. The gonadal rudiments are formed by 144 h in the midlateral position of abdominal segments 6 and 7. Each rudiment consists of 6-8 pole cells that are surrounded by a layer of splanchnic mesodermal cells. The pole cells in each rudiment begin mitosis at 180 h; by 204 h the total number of cells in each rudiment is attained (6-10). No other part of the reproductive system is formed during embryogeny of the egg stage. RP ABBASSY, MM (reprint author), USN,MED RES UNIT 3,MED ZOOL BRANCH,PSC 452,BOX 5000,FPO,AE 09835, USA. NR 14 TC 2 Z9 2 U1 0 U2 1 PU ENTOMOL SOC AMER PI LANHAM PA 9301 ANNAPOLIS RD, LANHAM, MD 20706 SN 0013-8746 J9 ANN ENTOMOL SOC AM JI Ann. Entomol. Soc. Am. PD NOV PY 1995 VL 88 IS 6 BP 821 EP 826 PG 6 WC Entomology SC Entomology GA TH782 UT WOS:A1995TH78200017 ER PT J AU STRICKMAN, D SHEER, T SALATA, K HERSHEY, J DASCH, G KELLY, D KUSCHNER, R AF STRICKMAN, D SHEER, T SALATA, K HERSHEY, J DASCH, G KELLY, D KUSCHNER, R TI IN-VITRO EFFECTIVENESS OF AZITHROMYCIN AGAINST DOXYCYCLINE-RESISTANT AND DOXYCYCLINE-SUSCEPTIBLE STRAINS OF RICKETTSIA-TSUTSUGAMUSHI, ETIOLOGIC AGENT OF SCRUB TYPHUS SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article AB In an effort to find a potential alternative treatment for scrub typhus, we evaluated the effectiveness of the standard drug doxycycline and the new macrolide azithromycin against a doxycycline-susceptible strain (Karp) and a doxycycline-resistant strain (AFSC-4) of Rickettsia tsutsugamushi, The antibiotics were tested in an in vitro assay system in which infected mouse fibroblast cells (L929) were incubated for 3 days in various concentrations of the drugs. Rickettsial growth was evaluated by direct visual counts of rickettsiae in Giemsastained cells or by flow cytometry, Initial tests were conducted at the concentration of each antibiotic considered to be the upper breakpoint for susceptibility (16 mu g/ml for doxycycline and 8 mu g/ml for azithromycin). Growth of both Karp and AFSC-4 was strongly inhibited with both antibiotics, as measured by visual counts, although the percentage of cells infected with AFSC-3 in the presence of doxycycline was three times greater than the percentage of cells infected with Karp but was only 60% as great as the percentage of cells infected with Karp in the presence of azithromycin, Flow cytometry confirmed that rickettsial growth occurred in the absence of antibiotics, but it failed to detect it in the presence of high concentrations of either drug, Visual counts of rickettsial growth at lower concentrations of the antibiotics (0.25 to 0.0078 mu g/ml) showed that the Karp strain was 16 times more susceptible that the AFSC-4 strain to doxycycline. Azithromycin was much more effective than doxycycline against AFSC-4, inhibiting rickettsial growth at 0.0156 mu g/ml to levels below that achieved by 0.25 mu g of doxycycline per mi, Azithromycin was also more effective than doxycycline against the Karp strain, causing greater reductions in the number of rickettsiae per cell at lower concentrations. If in vivo testing confirms the in vitro effectiveness of azithromycin, it may prove to be the drug of choice for the treatment of scrub typhus in children and pregnant women, who should not take doxycycline, and in patients with refractory disease from locations where doxycycline-resistant strains of R. tsutsugamushi have been found, When tested in an in vitro assay system, azithromycin was more effective than doxycycline against doxycycline-susceptible and -resistant strains of R. tsutsugamushi. C1 USN,MED RES INST,VIRAL & RICKETTSIAL DIS PROGRAM,BETHESDA,MD 20889. WALTER REED ARMY MED CTR,DEPT CLIN INVEST,WASHINGTON,DC 20307. RP STRICKMAN, D (reprint author), WALTER REED ARMY INST RES,DEPT RICKETTSIAL DIS,WASHINGTON,DC 20307, USA. NR 27 TC 42 Z9 44 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD NOV PY 1995 VL 39 IS 11 BP 2406 EP 2410 PG 5 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA TD129 UT WOS:A1995TD12900007 PM 8585717 ER PT J AU JACOBSON, MS LIPMAN, MJ MCMORRIS, FR AF JACOBSON, MS LIPMAN, MJ MCMORRIS, FR TI TREES THAT ARE SPHERE-OF-INFLUENCE GRAPHS SO APPLIED MATHEMATICS LETTERS LA English DT Article AB Given a collection of points in the plane, an open (closed) disk is drawn about each point with radius equal to the smallest distance from that point to any other in the collection. The sphere-of-influence graph (closed-sphere-of-influence graph) is the intersection graph of these disks. Any graph isomorphic to such a graph is SIG (CSIG). We characterize trees that are SIGs and CSIGs, and obtain a bound on the number of edges in triangle-free SIGs and CSIGs. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP JACOBSON, MS (reprint author), UNIV LOUISVILLE,DEPT MATH,LOUISVILLE,KY 40292, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0893-9659 J9 APPL MATH LETT JI Appl. Math. Lett. PD NOV PY 1995 VL 8 IS 6 BP 89 EP 93 DI 10.1016/0893-9659(95)00091-4 PG 5 WC Mathematics, Applied SC Mathematics GA TD606 UT WOS:A1995TD60600017 ER PT J AU PAZIRANDEH, M CHRISEY, LA MAURO, JM CAMPBELL, JR GABER, BP AF PAZIRANDEH, M CHRISEY, LA MAURO, JM CAMPBELL, JR GABER, BP TI EXPRESSION OF THE NEUROSPORA-CRASSA METALLOTHIONEIN GENE IN ESCHERICHIA-COLI AND ITS EFFECT ON HEAVY-METAL UPTAKE SO APPLIED MICROBIOLOGY AND BIOTECHNOLOGY LA English DT Article ID SEQUENCES; PROTEINS AB The gene coding for the Neurospora crassa metallothionein protein was chemically synthesized and cloned into the fusion expression vectors pMal-c and pMal-p. Cell-fractionation experiments demonstrated the proper localization of the pMal-c- and pMal-p- expressed proteins to the cytosol and periplasm of the bacteria respectively. Control bacteria as well as the recombinant bacteria producing the metallothionein protein were incubated with solutions of Cd-109 at concentrations of 0.2 mu M, 1 mu M, and 10 mu M. The recombinant bacteria were able to accumulate significantly more Cd-109 than control bacteria at al concentrations tested. Cadmium accumulation was rapid and highly selective. Maximum uptake was achieved at a pH of 7.0, with lower accumulation at lower or higher pH values. The pH-dependent uptake of cadmium by the recombinant bacteria was exploited to strip off the bound cadmium from the recombinant bacteria and to regenerate most of the cadmium-binding sites. These observations suggest the potential for using a metallothionein-based biosorbent for certain heavy-metal removal applications. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. RP PAZIRANDEH, M (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. NR 16 TC 50 Z9 50 U1 1 U2 5 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0175-7598 J9 APPL MICROBIOL BIOT JI Appl. Microbiol. Biotechnol. PD NOV PY 1995 VL 43 IS 6 BP 1112 EP 1117 PG 6 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA TH310 UT WOS:A1995TH31000026 PM 8590662 ER PT J AU MCDONALD, DD BOHUSZ, T MUNN, S SCHOCK, S AF MCDONALD, DD BOHUSZ, T MUNN, S SCHOCK, S TI THE RESPONSE OF WOMEN TO GENDER STEREOTYPING DURING A HEALTH INTERVIEW SO APPLIED NURSING RESEARCH LA English DT Article ID NURSES; PAIN; CARE; MEN AB Gender-stereotypical responses and critical health information were examined in this posttest-only experiment. Thirty-eight university women students and staff were randomly assigned to a gender-stereotyped or a nonstereotyped health interview, Gender-biased cues were embedded in three of the five questions in the gender-stereotyped interview. Women in the gender-stereotyped interview responded with significantly more gender-stereotypical responses. However, no subjects felt affected by the gender-biased cues. Findings suggest that women affirm gender-biased questions asked in health interviews. Copyright (C) 1995 by W.B. Saunders Company C1 USN HOSP,SPECIALIZED CARE UNIT,GROTON,CT. JOHNSON MEM HOSP,DEPT EMERGENCY,CRIT CARE SERV,STAFFORD SPRINGS,CT. RP MCDONALD, DD (reprint author), UNIV CONNECTICUT,SCH NURSING,U-59,AUDITORIUM RD,STORRS,CT 06269, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0897-1897 J9 APPL NURS RES JI Appl. Nurs. Res. PD NOV PY 1995 VL 8 IS 4 BP 182 EP 186 DI 10.1016/S0897-1897(95)80405-6 PG 5 WC Nursing SC Nursing GA TK267 UT WOS:A1995TK26700006 PM 8579351 ER PT J AU KOWALSKI, MP BARBEE, TW CRUDDACE, RG SEELY, JF RIFE, JC HUNTER, WR AF KOWALSKI, MP BARBEE, TW CRUDDACE, RG SEELY, JF RIFE, JC HUNTER, WR TI EFFICIENCY AND LONG-TERM STABILITY OF A MULTILAYER-COATED, ION-ETCHED BLAZED HOLOGRAPHIC GRATING IN THE 125-133-ANGSTROM WAVELENGTH REGION SO APPLIED OPTICS LA English DT Article DE DIFFRACTION GRATING; MULTILAYER COATING; EXTREME ULTRAVIOLET ID SYNCHROTRON RADIATION; PERFORMANCE; OPERATION; CARBON AB The efficiency of an ion-etched blazed holographic grating was measured by the use of synchrotron radiation in the 125-133-Angstrom wavelength range and at near-normal incidence. The grating had a Mo-Si multilayer interference coating that resulted in a peak normal-incidence efficiency of 13% in the second grating order and at a wavelength of 128 Angstrom. This is the highest efficiency obtained to date from a multilayer-coated grating in this wavelength region and at normal incidence. These measurements are compared with similar measurements performed on the same grating 4.5 years later. Over this time the peak grating efficiency decreased from 13% to 8%, and this result is attributed to the decrease in the reflectance of the multilayer coating from 55% to 42%. Oxidation and contamination of the multilayer with carbon appear to be the causes of these losses. The groove efficiency of the grating substrate in the second order is 23%. (C) 1995 Optical Society of America C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. SFA INC,LANDOVER,MD 20785. RP KOWALSKI, MP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 22 Z9 22 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 1 PY 1995 VL 34 IS 31 BP 7338 EP 7346 PG 9 WC Optics SC Optics GA TC983 UT WOS:A1995TC98300029 PM 21060607 ER PT J AU SEELY, JF CRUDDACE, RG KOWALSKI, MP HUNTER, WR BARBEE, TW RIFE, JC EBY, R STOLT, KG AF SEELY, JF CRUDDACE, RG KOWALSKI, MP HUNTER, WR BARBEE, TW RIFE, JC EBY, R STOLT, KG TI POLARIZATION AND EFFICIENCY OF A CONCAVE MULTILAYER GRATING IN THE 135-250-ANGSTROM REGION AND IN NORMAL-INCIDENCE AND SEYA-NAMIOKA MOUNTS SO APPLIED OPTICS LA English DT Article ID CRYSTAL MONOCHROMATOR; PERFORMANCE; OPERATION AB A molybdenum/silicon multilayer coating was applied to a holographic ion-etched blazed grating substrate that had 2400 grooves/mm and a radius of curvature of 2.2 m. Scanning probe microscopy yielded the same surface microroughness (5 Angstrom rms) before and after deposition of the multilayer. The efficiency and polarization performance of the grating was measured by synchrotron radiation in the 135-250-Angstrom wavelength region. In the second grating order and the second Bragg order of the multilayer coating, the peak normal-incidence efficiency was 7.5% at a wavelength of 147 Angstrom, representing a groove efficiency of 27%. At an angle of incidence of 35 degrees, the polarization performance of the grating was 95%-100% in the 210-250-Angstrom wavelength region. In a Seya-Namioka spectrometer mount at an angle of incidence of 30 degrees-40 degrees, the grating is a nearly perfect polarizing optical element in the wavelength bands between 125 and 300 Angstrom, which are covered by the multilayer coating. (C) 1995 Optical Society of America C1 SFA INC,LANDOVER,MD 20785. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. TOPOMETRIX CORP,BEDMINSTER,NJ 07921. ANALYT ANSWERS INC,WOBURN,MA. RP SEELY, JF (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 13 TC 23 Z9 23 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 1 PY 1995 VL 34 IS 31 BP 7347 EP 7354 PG 8 WC Optics SC Optics GA TC983 UT WOS:A1995TC98300030 PM 21060608 ER PT J AU Fisher, MA Allen, LH Cukauskas, EJ AF Fisher, MA Allen, LH Cukauskas, EJ TI YBa2Cu3O7/noble metal composite thin films for applications in fluxonic and flux-flow devices SO APPLIED SUPERCONDUCTIVITY LA English DT Article ID Y1BA2CU3O7-X; SILVER; GROWTH AB This research involves the study of thin films for use in three-terminal, non-linear two-terminal, and photodetector superconducting devices. The morphological and electrical properties of composite films fabricated from YBCO and noble metals have been investigated for use in these devices. Films of Ag and Au, when heated to YBCO deposition temperatures, coalesce into small, approximately micron-sized islands. We take advantage of this property to form a composite film with distinct YBCO and noble metal regions by depositing a layer of YBCO on the array of noble metal islands. With certain compositions the films exhibit reduction of critical current density by a factor of 65 over YBCO and show no significant degradation of critical temperature. Also, the current-voltage characteristics of the composites are sensitive to small, applied magnetic fields. These properties make the YBCO/noble metal composites potentially well suited for the fabrication of devices whose transport is dependent upon vortex motion. Photoresponse measurements taken on a 1 mm x 1 mm YBCO/Au bridge irradiated by red laser light showed a possible non-bolometric response below the composite superconducting transition temperature. RP Fisher, MA (reprint author), USN,RES LAB,CODE 6862,WASHINGTON,DC 20375, USA. NR 20 TC 5 Z9 5 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD NOV-DEC PY 1995 VL 3 IS 11-12 BP 607 EP 614 DI 10.1016/0964-1807(96)00003-8 PG 8 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA UP626 UT WOS:A1995UP62600010 ER PT J AU POHL, M REICH, W KRICHBAUM, TP STANDKE, K BRITZEN, S REUTER, HP REICH, P SCHLICKEISER, R FIEDLER, RL WALTMAN, EB GHIGO, FD JOHNSTON, KJ AF POHL, M REICH, W KRICHBAUM, TP STANDKE, K BRITZEN, S REUTER, HP REICH, P SCHLICKEISER, R FIEDLER, RL WALTMAN, EB GHIGO, FD JOHNSTON, KJ TI RADIO OBSERVATIONS OF THE GAMMA-RAY QUASAR-0528+134 - SUPERLUMINAL MOTION AND AN EXTREME SCATTERING EVENT SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE QUASARS, Q 0528+134; RADIO CONTINUUM, GALAXIES; ISM, STRUCTURE; SCATTERING ID INTERSTELLAR-MEDIUM; GHZ; SCINTILLATION; VARIABILITY; SYSTEM AB We report on multifrequency radio observations made with the Effelsberg 100-m telescope, the IRAM 30-m telescope and the Green Bank Interferometer between 1992 and 1994 of the gamma-ray quasar 0528 + 134. We present a new VLBI based map of 0528 + 134 at 22 GHz with sub-mas angular resolution observed in November 1992. At that time the source was in a phase of brightening at all of our observing frequencies above 3 GHz. The increase of brightness may be related to activity in the unresolved core component of the quasar. The VLBI map at 22 GHz (epoch 1992.85) shows a one-sided core jet structure of similar to 5 mas length. A new component close to the core indicates an apparent transverse velocity of beta(app) less than or equal to 20 (H-o = 100 km sec(-1) Mpc(-1), q(o) = 0.5). A second component, seen also previously at 8.4 GHz & 22 GHz, shows apparent superluminal motion with beta(app) = 4.4 +/- 1.7. Superluminal motion is expected since strong Doppler boosting in this source is required in view of the gamma-ray luminosity and the variability timescale, which violate the compactness limit. In summer 1993 we observed a major outburst at all frequencies higher than a few GHz, which peaked a few months after a strong outburst in high energy gamma-rays and showed the canonical time evolution of a cooling and/or expanding electron distribution. Our data indicate that the outburst in the EGRET range originated very close to the central object of the AGN and that a remnant of this outburst moved further outward in the jet until it became optically thin at radio frequencies after a few months. During the flare in July 1993 we observed with the Effelsberg 100-m telescope an unusually strong decrease of the flux density by about 50% at 4.75 GHz and 10.55 GHz and slightly less at 2.695 GHz. This behaviour is also seen in the monitoring data at 2.25 GHz and 8.3 GHz taken with the Green Bank Interferometer (NRL-GBI). The event lasted less than three days at the higher frequencies and more than two weeks at 2.25 GHz. For the case that this event is related to the intense radio flare some geometrical effects like a small variation of the viewing angle of the quasars jet orientated very close to the line of sight are considered, but found to be an unlikely explanation for the observed behaviour. Alternatively, an extreme scattering event by a small dense plasma cloud in the line of sight is able to match the observed time lag in the lightcurves if we take into account the mas-structure of the source and different spectra of the components on the basis of their brightness in the VLBI maps. The importance of interstellar scattering is stressed as 0528 + 134 is seen in the direction of the dark cloud Barnard 30 located at 400 pc distance in the Orion complex and that we note frequent fluctuations of the order of 25% at 2.3 GHz/2.695 GHz, our lowest monitoring frequencies, while the variations at higher frequencies are more smooth. It is shown that the appearance of the extreme scattering event in the light curves of 0528 + 134 depends strongly on its VLBI structure and on the observed spectral appearance in our two frequency VLBI data. Due to these strong constraints our successful modelling provides the best available evidence that unusual variability behaviour of AGN may be caused by extreme scattering events and that localised (r < 1 AU) and dense (n(e) = 100-1000 cm(-3)) plasma structures do exist in the interstellar medium of our Galaxy. C1 MAX PLANCK INST RADIOASTRON, D-53121 BONN, GERMANY. UNIV BONN, INST GEODAT, D-53121 BONN, GERMANY. INST RADIO ASTRON MILLIMETR, E-18012 GRANADA, SPAIN. NRL, DIV REMOTE SENSING, WASHINGTON, DC 20375 USA. NATL RADIO ASTRON OBSERV, GREEN BANK, WV 24944 USA. USN OBSERV, WASHINGTON, DC 20392 USA. RP POHL, M (reprint author), MAX PLANCK INST EXTRATERR PHYS, POSTFACH 1603, D-85740 GARCHING, GERMANY. NR 42 TC 48 Z9 48 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD NOV PY 1995 VL 303 IS 2 BP 383 EP 397 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TE384 UT WOS:A1995TE38400010 ER PT J AU TIEFTRUNK, AR WILSON, TL STEPPE, H GAUME, RA JOHNSTON, KJ CLAUSSEN, MJ AF TIEFTRUNK, AR WILSON, TL STEPPE, H GAUME, RA JOHNSTON, KJ CLAUSSEN, MJ TI THE W3 CORE - MASSES, DENSITIES, SIZES AND KINEMATICS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE ISM, CLOUDS; ISM, MOLECULES; RADIO LINES, ISM; ISM, MAGNETIC FIELDS; ISM, W 3 ID MOLECULAR CLOUD CORE; TIME-DEPENDENT SOLUTION; GALACTIC SPIRAL ARMS; MAGNETIC BRAKING; STAR FORMATION; COMPLEX W3; REGION; EMISSION; SUBMILLIMETER; GALAXY AB The core of the W 3 molecular cloud has been mapped in a 3' x 2' region in the J=2-1 transition of (CO)-O-18 and the J=3-2 and J=5-4 transitions of (CS)-S-34 with angular resolutions of 11'', 17'' and 10'', respectively, using the IRAM 30-m telescope. The W 3 core consists of two regions separated by 75'' (=0.85 pc at 2.3 kpc). The region associated with W 3 IRS 5 has an average v(Isr)approximate to -39 km s(-1) and a mass of 800 M.. The other, more extended region associated with W 3 IRS 4 has an average v(Isr)approximate to -43 km s(-1) and a mass of 1500 M.. The IRS 4 region is resolved into four smaller clumps. One of these is close to, but not coincident with, the submillimeter continuum peak SMS 3; another is very close to IRS 4 and SMS 2. The IRS 5 region is barely resolved into four clumps. There is a clump centered on IRS 5. From the (CO)-O-18 data, the H-2 column densities of the clumps have been determined. From a Large Velocity Gradient analysis of the (CS)-S-34 3-2/5-4 ratios the H-2 densities and masses were estimated; these are compared with general results from the virial theorem. Dynamics are investigated using velocity channel maps. Over a 70'' region in Declination, the v(Isr) of the IRS 4 region changes from -42 km s(-1) in the southern part to -46 km s(-1) in the northern part. For the northern part of IRS 4, over 70'' in Right Ascension, there is a change from -41 km s(-1) in the western part to -47 km s(-1) in the eastern part. This velocity change is opposite to the sense of galactic rotation; the gradient is 9 km s(-1)pc(-1). For the IRS 5 region, there is a similar change in v(Isr) with Dec., but only a small change with R.A. Considering the presence of a magnetic field of 100 mu G towards IRS 4 and the striking change in radial velocity, we speculate that ''magnetic braking'' dominates the dynamics in the IRS 4 region. Our (CO)-O-18 and (CS)-S-34 results are compared with the abundances of other molecular species and show that the IRS 4 and IRS 5 regions have distinctly different chemistry. C1 IRAM, E-18012 GRANADA, SPAIN. USN OBSERV, WASHINGTON, DC 20392 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. NATL RADIO ASTRON OBSERV, SOCORRO, NM 80375 USA. RP TIEFTRUNK, AR (reprint author), MAX PLANCK INST RADIOASTRON, HUGEL 69, D-53121 BONN, GERMANY. NR 43 TC 27 Z9 27 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD NOV PY 1995 VL 303 IS 3 BP 901 EP 913 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TG523 UT WOS:A1995TG52300036 ER PT J AU FEY, AL GAUME, RA CLAUSSEN, MJ VRBA, FJ AF FEY, AL GAUME, RA CLAUSSEN, MJ VRBA, FJ TI NEAR-INFRARED AND VERY HIGH-SENSITIVITY VLA-2 CENTIMETER CONTINUUM OBSERVATIONS OF THE H-II REGION G29.96-0.02 SO ASTROPHYSICAL JOURNAL LA English DT Article DE H II REGIONS; ISM, INDIVIDUAL (G29.96-0.02); ISM, STRUCTURE; RADIO CONTINUUM, ISM ID PHYSICAL-PROPERTIES AB The ultracompact H II region G29.96-0.02 has been imaged at a frequency of 15 GHz using combined multiple Very Large Array configuration data. The images show a remarkably complex structure. The edge-brightened arclike core of the H Ir region is embedded in low-level emission extending over several tens of arcseconds (1 '' approximate to 0.036 pc). Filamentary-like structures are observed east of the core, some perpendicular to the symmetry axis of the arclike core. These radio continuum observations are inconsistent with predictions of current models for ultracompact H II regions. Near-infrared images have also been obtained with the USNO infrared camera. These images identify the position of the ionizing star and suggest that the H II region is embedded in a young stellar cluster. We suggest a model in which the radio continuum appearance of G29.96-0.02 may be explained simply by expansion in a highly anisotropic medium; more exotic models are not required. To the west, the H II region is expanding into a region with a relatively high ambient density. This denser region impedes the expansion of the H II region in that direction. Molecular material is photoevaporated off a hot molecular core and is then swept back along pressure gradients, creating the cometary appearance. On the eastern side, the H II region expands freely into a less dense but still highly anisotropic ambient medium, thus creating the observed filamentary structure. C1 NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. USN OBSERV,FLAGSTAFF,AZ 86002. RP FEY, AL (reprint author), USN OBSERV,CODE EO,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 23 TC 25 Z9 25 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 1 PY 1995 VL 453 IS 1 BP 308 EP & DI 10.1086/176390 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TB033 UT WOS:A1995TB03300028 ER PT J AU LUNDGREN, SC ZEPKA, AF CORDES, JM AF LUNDGREN, SC ZEPKA, AF CORDES, JM TI A MILLISECOND PULSAR IN A 6 HOUR ORBIT - PSR-J0751+1807 SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; GAMMA RAYS, OBSERVATIONS; PULSARS, INDIVIDUAL (PSR 50751+1807); STARS, FUNDAMENTAL PARAMETERS; WHITE DWARFS ID RELATIVISTIC GRAVITY; BINARY; EVOLUTION; SYSTEMS; MASSES; STAR AB A 3.48 ms pulsar in a 6.3 hr binary orbit has been discovered in a systematic survey of error boxes around unidentified gamma-ray sources. The spin-down energy of the pulsar is not sufficient to power the estimated gamma-ray emission from the putative gamma-ray source. The mass function, small orbit, low eccentricity, and large timing age imply that the companion is most likely a 0.12 M. < m(c) < 0.6 M. white dwarf Lack of eclipses or propagation delays varying with orbital phase imply that the companion is well contained inside its Roche lobe. Pulsar J0751+1807 fits into a class of small circular orbit (<30 days) objects which have undergone spiral-in. Examining the known population of short orbital period objects, we find a positive correlation between orbital period and magnetic field strength. C1 CORNELL UNIV, DEPT ASTRON, ITHACA, NY 14853 USA. RP LUNDGREN, SC (reprint author), USN, RES LAB, CODE 7210, WASHINGTON, DC 20375 USA. NR 34 TC 56 Z9 56 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 1 PY 1995 VL 453 IS 1 BP 419 EP 423 DI 10.1086/176402 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TB033 UT WOS:A1995TB03300040 ER PT J AU LUNDGREN, SC CORDES, JM ULMER, M MATZ, SM LOMATCH, S FOSTER, RS HANKINS, T AF LUNDGREN, SC CORDES, JM ULMER, M MATZ, SM LOMATCH, S FOSTER, RS HANKINS, T TI GIANT PULSES FROM THE CRAB PULSAR - A JOINT RADIO AND GAMMA-RAY STUDY SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA RAYS, OBSERVATIONS; PULSARS, INDIVIDUAL (CRAB PULSAR); RADIATION MECHANISMS, NONTHERMAL ID RADIATION; EMISSION; RESOLUTION; TESTS; GAPS AB The Crab Nebula pulsar emits bursts of radio emission as strong as 2000 times the average pulse amplitude. Using joint radio and gamma-ray observations of these giant radio pulses, we characterized intensity variations, measured absolute timing with 70 mu s precision, and determined the spin-down model and interstellar dispersion. Fitting the flux-density histogram requires a two-component model-a narrow distribution of weak (but nonzero) pulses and a power-law component for giant pulses with an index of -3.3 and a low-intensity cutoff that is 33 times the mean of the weak pulses. The lack of time delay between giant pulses and weak pulses (Delta t = 6 +/- 12 mu s) suggests that the two emission mechanisms operate within a 4 km region. Daily changes in the apparent rate of giant pulses are caused by propagation effects in the interstellar medium (scintillation) rather than intrinsic variability of the giant-pulse mechanism. The distribution of time separations between giant pulses implies that the mechanism is a Poisson process. We interpret giant-pulse properties in the context of temporal-modulation and beam-waver models. Only the temporal-modulation model is consistent with the data. Empirical measurements place limits on the duration, size, and rate of temporal modulations in the magnetosphere. Gamma-ray flux increases in the 50-220 keV range are limited to less than a factor of 2.5 concurrent with radio bursts. We discuss how the lack of gamma-ray variation constrains radio coherence mechanisms, the steadiness of electron-positron outflow, and the amount of inverse-Compton scattering of radio photons to gamma rays. C1 CORNELL UNIV,DEPT ASTRON,ITHACA,NY 14853. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. NEW MEXICO INST MIN & TECHNOL,SOCORRO,NM 87801. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. RP LUNDGREN, SC (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7210,WASHINGTON,DC 20375, USA. NR 49 TC 131 Z9 133 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 1 PY 1995 VL 453 IS 1 BP 433 EP 445 DI 10.1086/176404 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TB033 UT WOS:A1995TB03300042 ER PT J AU MEYER, LG HORRIGAN, DJ LOTZ, WG AF MEYER, LG HORRIGAN, DJ LOTZ, WG TI EFFECTS OF 3 HYDRATION BEVERAGES ON EXERCISE PERFORMANCE DURING 60 HOURS OF HEAT EXPOSURE SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID CARBOHYDRATE; HYPOHYDRATION; HYPERHYDRATION; TEMPERATURE; RESPONSES; FLUIDS; WATER AB Without adequate hydration, profound heat stress and dehydration can occur in people who work in hot environments. This study evaluated the effectiveness of three beverages on temperature regulation, cardiovascular response, and work performance during 60 h of dry heat exposure. Volunteer subjects lived in a climatic chamber in simulated desert conditions varying from 25-45 degrees C at 20% relative humidity. They performed three submaximal exercise sessions on a motorized treadmill at 4-h intervals each day. All of the subjects consumed one of three beverages: a water placebo, a 5% carbohydrate-electrolyte drink, or a 4% carbohydrate-electrolyte drink containing 1% glycerol, during each 60-h session. During exercise, the rating of perceived exertion and heart rate were similar for all beverages and all sessions, but oxygen consumption, core body and average skin temperatures, and sweat rate differed among beverages and sessions. Water alone appeared to provide adequate hydration for working in desert conditions over the 60 h when compared to carbohydrate-electrolyte beverages, with or without a small amount of glycerol. RP MEYER, LG (reprint author), USN,AEROSP MED RES LAB,DIV ENVIRONM PHYSIOL,NAS,51 HOVEY RD,PENSACOLA,FL 32508, USA. NR 25 TC 10 Z9 10 U1 1 U2 5 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD NOV PY 1995 VL 66 IS 11 BP 1052 EP 1057 PG 6 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA TB335 UT WOS:A1995TB33500005 PM 8588794 ER PT J AU CHARLES, PT CONRAD, DW JACOBS, MS BART, JC KUSTERBECK, AW AF CHARLES, PT CONRAD, DW JACOBS, MS BART, JC KUSTERBECK, AW TI SYNTHESIS OF A FLUORESCENT ANALOG OF POLYCHLORINATED-BIPHENYLS FOR USE IN A CONTINUOUS-FLOW IMMUNOSENSOR ASSAY SO BIOCONJUGATE CHEMISTRY LA English DT Article ID PCBS AB A synthetic scheme has been developed for the preparation of a dye-labeled analog of polychlorinated biphenyls. The reaction of 2,3,5-trichlorophenol with 3-bromopropylamine hydrobromide under basic conditions was used to introduce a free primary amine group into the parent compound by formation of a stable ether linkage. Reaction of this amine with the succinimidyl ester of a sulfoindocyanine dye resulted in amide bond formation to produce a fluorescently-labeled product. The dye conjugate was used to charge a column containing immobilized antibodies against polychlorinated biphenyls. Upon application of samples containing various concentrations of polychlorinated biphenyls, the fluorescent analog was displaced from the column in amounts proportional to the concentration of analyte. Concentrations of polychlorinated biphenyl as low as 1 ppm were measurable using this system. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 16 TC 22 Z9 22 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 1043-1802 J9 BIOCONJUGATE CHEM JI Bioconjugate Chem. PD NOV-DEC PY 1995 VL 6 IS 6 BP 691 EP 694 DI 10.1021/bc00036a005 PG 4 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Multidisciplinary; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA TH378 UT WOS:A1995TH37800006 PM 8608181 ER PT J AU CARROLL, TL AF CARROLL, TL TI SYNCHRONIZATION AND COMPLEX DYNAMICS IN PULSE-COUPLED CIRCUIT MODELS OF NEURONS SO BIOLOGICAL CYBERNETICS LA English DT Article ID CHAOS AB Synchronization of neurons may have some biological significance, but there are questions about how neurons can sometimes be synchronized and sometimes not. In this work, electronic circuit models of the Fitzhugh-Nagumo equations are used to stimulate four pulse-coupled neurons. For some coupling configurations, the circuits are only partly synchronized even though all circuits share a common drive. It is shown that this partial synchronization is a byproduct of high-dimensional (but not necessarily chaotic) dynamics. RP CARROLL, TL (reprint author), USN,RES LAB,CODE 6341,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 15 TC 17 Z9 17 U1 1 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-1200 J9 BIOL CYBERN JI Biol. Cybern. PD NOV PY 1995 VL 73 IS 6 BP 553 EP 559 DI 10.1007/BF00199547 PG 7 WC Computer Science, Cybernetics; Neurosciences SC Computer Science; Neurosciences & Neurology GA TH541 UT WOS:A1995TH54100007 ER PT J AU Johnson, DR AF Johnson, DR TI Wind forced surface currents at the entrance to Chesapeake Bay: Their effect on blue crab larval dispersion and post-larval recruitment SO BULLETIN OF MARINE SCIENCE LA English DT Article; Proceedings Paper CT Symposium on Blue Crab Recruitment - Environmental Control and Population Regulation, at the Estuarine-Research-Federation Conference CY NOV 16, 1993 CL HILTON HEAD ISL, SC SP Estuarine Res Federat ID CALLINECTES-SAPIDUS; CURRENT-METER; TRANSPORT AB The objectives of this study were: (1) to investigate the near-field influence of wind forcing on the Chesapeake Bay outflow plume and subsequent dispersion of blue crab larvae (Callinectes sapidus) onto the continental shelf, and (2) to investigate the potential for wind-induced surface currents to return post-larvae (megalopae) back into the bay for recruitment to the bay's population. In June 1985, several surface current meters were moored in and around the entrance to Chesapeake Bay in order to examine the near-field of the plume and its dispersion characteristics. Together with hydrographic surveys and drifter experiments from the MECCAS project, it was found that, during the time of peak wind stress toward the north, sub-inertial currents were highly variable in the plume region. The character of near-field dynamics under the influence of northward wind stress included northward movement of the plume's exit position in the bay mouth along with near-field expansion, collapse and residual patchiness. This behaviour would be advantageous for disperisal of larvae into the northeastward quadrant of the Chesapeake Eight in position for successful return. From mid-August to mid-September, other surface current meters were placed in the center and northside of the entrance to the bay in order to test the hypothesis of a return to the bay by wind forced surface currents. With negligible return flow observed at the surface during the August/September experiment, it was felt that this part of the hypothetical strategy is probably not correct. However, it should be noted that the time series may not be sufficiently long for a definitive answer to this question. RP Johnson, DR (reprint author), USN,RES LAB,OCEAN SCI DIV,CODE 7332,BAY ST LOUIS,MS 39529, USA. NR 21 TC 21 Z9 21 U1 0 U2 0 PU ROSENSTIEL SCH MAR ATMOS SCI PI MIAMI PA 4600 RICKENBACKER CAUSEWAY, MIAMI, FL 33149 SN 0007-4977 J9 B MAR SCI JI Bull. Mar. Sci. PD NOV PY 1995 VL 57 IS 3 BP 726 EP 738 PG 13 WC Marine & Freshwater Biology; Oceanography SC Marine & Freshwater Biology; Oceanography GA TN246 UT WOS:A1995TN24600016 ER PT J AU DeLeon, PH Sammons, MT Fox, RE AF DeLeon, PH Sammons, MT Fox, RE TI A commentary: Canada is not that far North SO CANADIAN PSYCHOLOGY-PSYCHOLOGIE CANADIENNE LA English DT Article ID PRESCRIPTION PRIVILEGES; PSYCHOLOGY AB The time has come for professional psychology to actively seek prescription privileges. Although the political gestalt in Canada may differ somewhat from that in the United States, the underlying policy issues are identical. Psychology has demonstrated that it can develop viable training modules and that by utilizing post-doctoral Fellowships, the profession will retain the basic integrity of its underlying scientific and behavioural knowledge base. The authors contend that Dozois and Dobson significantly overestimate the extent of psychology's internal opposition; underestimate psychiatry's historical hostility; and have given insufficient thought to potential new ''market places'' and scientific endeavours. As professional psychology systematically focusses upon society's real needs, all will substantially benefit. C1 USN,WASHINGTON,DC 20375. RP DeLeon, PH (reprint author), US SENATE,WASHINGTON,DC 20510, USA. NR 9 TC 6 Z9 6 U1 0 U2 0 PU CANADIAN PSYCHOL ASSOC PI QUEBEC CITY PA RUE VINCENT RD OLD CHELSEA, QUEBEC CITY J0X 2N0, CANADA SN 0708-5591 J9 CAN PSYCHOL JI Can. Psychol.-Psychol. Can. PD NOV PY 1995 VL 36 IS 4 BP 320 EP 326 DI 10.1037/0708-5591.36.4.320 PG 7 WC Psychology, Multidisciplinary SC Psychology GA TQ418 UT WOS:A1995TQ41800006 ER PT J AU HYAMS, KC MALONE, JD BOURGEOIS, AL HAWKINS, R HALE, TL MURPHY, JR AF HYAMS, KC MALONE, JD BOURGEOIS, AL HAWKINS, R HALE, TL MURPHY, JR TI SERUM ANTIBODY TO LIPOPOLYSACCHARIDE ANTIGENS OF SHIGELLA SPECIES AMONG US MILITARY PERSONNEL DEPLOYED TO SAUDI-ARABIA AND KUWAIT DURING OPERATIONS DESERT-SHIELD AND DESERT-STORM SO CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY LA English DT Article ID NATURAL IMMUNITY; O-ANTIGEN; VACCINE; INFECTIONS AB During Operations Desert Shield and Desert Storm, U.S. troops were at high risk of diarrheal disease due to Shigella spp., particularly Shigella sonnei. In order to better understand the serologic response to Shigella infection, 830 male U.S. combat troops were evaluated before and after the deployment to Saudi Arabia and Kuwait for immunoglobulin A (IgA) and IgG anti-Shigella lipopolysaccharide (LPS) (antibody to S. sonnei form I and Shigella flexneri serotypes 1a, 2a, and 3a) in serum. Just before deployment, 103% of the subjects were seropositive for IgA and 18.3% were positive for IgG anti-Shigella LPS. IgA and IgG anti-LPS antibody levels in serum prior to deployment were significantly associated with nonwhite race and ethnicity, birth outside the United States, and antibody to hepatitis A virus and Helicobacter pylori. During the deployment, which lasted for a mean of 131 days, 60% of the subjects reported at least one episode of diarrhea and 15% reported an episode of diarrhea with feverishness; also, 5.5% of the subjects exhibited IgA seroconversion to Shigella LPS and 14.0% exhibited IgG seroconversion, A significant association between the development of diarrheal symptoms and either positive predeployment anti-LPS antibody or seroconversion was not found, These data indicate that in this population of U.S. Desert Storm troops,who were at high risk of Shigella infection, there was no apparent relation between IgA or IgG anti-Shigella LPS in serum and diarrheal disease. C1 NATL NAVAL MED CTR, DIV INFECT DIS, BETHESDA, MD 20889 USA. WALTER REED ARMY MED CTR, DIV COMMUN DIS & IMMUNOL, WASHINGTON, DC 20307 USA. UNIV TEXAS, HLTH SCI CTR, CTR INFECT DIS, HOUSTON, TX USA. USN, MED RES UNIT 3, CAIRO, EGYPT. RP HYAMS, KC (reprint author), USN, MED RES INST, DEPT INFECT DIS, 12300 WASHINGTON AVE, ROCKVILLE, MD 20852 USA. NR 16 TC 6 Z9 6 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 1071-412X J9 CLIN DIAGN LAB IMMUN JI Clin. Diagn. Lab. Immunol. PD NOV PY 1995 VL 2 IS 6 BP 700 EP 703 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA TD038 UT WOS:A1995TD03800012 PM 8574833 ER PT J AU LEWIS, T AF LEWIS, T TI HP MEANS HIGH-POWERED - FUTUREBUSINESS, SIDE-A SO COMPUTER LA English DT Editorial Material RP LEWIS, T (reprint author), USN,POSTGRAD SCH,CODE CS,MONTEREY,CA 93943, USA. NR 0 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 SN 0018-9162 J9 COMPUTER JI Computer PD NOV PY 1995 VL 28 IS 11 BP 6 EP 8 DI 10.1109/2.471166 PG 3 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA TC583 UT WOS:A1995TC58300004 ER PT J AU STALTERS, R AF STALTERS, R TI TEAMING WITH COMPETENCE SO DATAMATION LA English DT Editorial Material RP STALTERS, R (reprint author), USN,CTR AIR WARFARE,DEPT INFORMAT MANAGEMENT,DIV AIRCRAFT,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU CAHNERS-DENVER PUBLISHING CO PI HIGHLANDS RANCH PA 8773 S RIDGELINE BLVD, HIGHLANDS RANCH, CO 80126-2329 SN 0011-6963 J9 DATAMATION JI Datamation PD NOV 1 PY 1995 VL 41 IS 20 BP 94 EP & PG 0 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA TB651 UT WOS:A1995TB65100029 ER PT J AU RAMESH, B SENGUPTA, K AF RAMESH, B SENGUPTA, K TI MULTIMEDIA IN A DESIGN RATIONALE DECISION-SUPPORT SYSTEM SO DECISION SUPPORT SYSTEMS LA English DT Article DE DESIGN RATIONALE; MULTIMEDIA; DECISION SUPPORT; CONCEPT MAP; ARGUMENTATION ID INFORMATION; HYPERTEXT AB The capture and use of design rationale information is widely recognized to be essential for the design and maintenance of large systems. Design rationale information needs to be captured from a variety of sources and contexts. A design rationale management system should be capable of representing and reasoning with both formal and informal information. REMAP/MM is a hypermedia decision support system that facilitates the capture of different types of design rationale knowledge using multiple media. The design rationale knowledge is represented using a conceptual model that includes the Issue Based Information Systems (IBIS) designed to model deliberations, a primary source of design rationale. The system incorporates models of multimedia components of design rationale, thereby facilitating reasoning with this knowledge. Decision support for the various stakeholders development is provided in the areas of management of system evolution, system maintenance with changing requirements, design replay, and fulfilling ad hoc information requirements. RP RAMESH, B (reprint author), USN,POSTGRAD SCH,CODE AS-RA,MONTEREY,CA 93943, USA. RI Ramesh, Balasubramaniam/C-2565-2008 NR 38 TC 16 Z9 16 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9236 J9 DECIS SUPPORT SYST JI Decis. Support Syst. PD NOV PY 1995 VL 15 IS 3 BP 181 EP 196 DI 10.1016/0167-9236(94)00060-6 PG 16 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Operations Research & Management Science SC Computer Science; Operations Research & Management Science GA TG763 UT WOS:A1995TG76300002 ER PT J AU WU, C AF WU, C TI PERFORMANCE OF A HEAT-DRIVEN ENDOREVERSIBLE COOLER SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE COOLER; HEAT DRIVEN; ENDOREVERSIBLE COOLER AB Heat-driven cooling becomes economically attractive when there is an available inexpensive heat source at low temperature. The maximum obtainable cooling load and the maximum obtainable coefficient of performance (COP) of a heat-driven endoreversible cooler are analyzed in this paper. The endoreversible cooler is an internally reversible, but externally irreversible, device which exchanges heat with the surroundings. The maximum obtainable cooling load and maximum obtainable coefficient of performance (COP) of the of existing heat-driven coolers. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-8904 J9 ENERG CONVERS MANAGE JI Energy Conv. Manag. PD NOV PY 1995 VL 36 IS 11 BP 1053 EP 1057 DI 10.1016/0196-8904(95)00002-U PG 5 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA RN722 UT WOS:A1995RN72200003 ER PT J AU PORCH, D AF PORCH, D TI THE REPUBLIC IN DANGER - GAMELIN,MAURICE AND THE POLITICS OF FRENCH DEFENCE, 1933-1940 - ALEXANDER,MS SO ENGLISH HISTORICAL REVIEW LA English DT Book Review RP PORCH, D (reprint author), USN,WAR COLL,NEWPORT,RI 02840, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU LONGMAN GROUP UK LTD PI HARLOW PA LONGMAN HOUSE, BURNT MILL, HARLOW, ESSEX, ENGLAND CM20 2JE SN 0013-8266 J9 ENGL HIST REV JI Engl. Hist. Rev. PD NOV PY 1995 VL 110 IS 439 BP 1334 EP 1335 PG 2 WC History SC History GA TL037 UT WOS:A1995TL03700144 ER PT J AU BLISS, JP GILSON, RD DEATON, JE AF BLISS, JP GILSON, RD DEATON, JE TI HUMAN PROBABILITY MATCHING BEHAVIOR IN RESPONSE TO ALARMS OF VARYING RELIABILITY SO ERGONOMICS LA English DT Article DE ATTENTION; ALARM; PSYCHOMOTOR PERFORMANCE; HABITUATION; MOTOR SKILLS ID WARNING MESSAGES; PERFORMANCE; SYSTEMS AB The goals of this research were to substantiate the existence of the cry-wolf effect for alarm responses, quantifying its effect on operator performance. A total of 138 undergraduate students performed two blocks of a cognitively demanding psychomotor primary task; at the same time, they were presented with alarms of varying reliabilities (25, 50 and 75% true alarms) and urgencies (green, yellow and red visual alarms presented concurrently with low-, medium- and high-urgency auditory civilian aircraft cockpit alarms). Alarm response frequencies were observed and analysed, and t-tests and repeated-measures MANOVAs were used to assess the effects of increasing alarm reliability on alarm response frequencies, speed and accuracy. The results indicate that most subjects (about 90%) do not respond to all alarms but match their response rates to the expected probability of true alarms (probability matching). About 10% of the subjects responded in the extreme, utilizing an all-or-none strategy. Implications of these results for alarm design instruction and further research are discussed. C1 UNIV CENT FLORIDA,DEPT PSYCHOL,ORLANDO,FL 32816. USN,CTR AIR WARFARE,DIV TRAINING SYST,ORLANDO,FL 32826. RP BLISS, JP (reprint author), UNIV ALABAMA,DEPT PSYCHOL,HUNTSVILLE,AL 35899, USA. NR 31 TC 91 Z9 91 U1 0 U2 5 PU TAYLOR & FRANCIS LTD LONDON PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0014-0139 J9 ERGONOMICS JI Ergonomics PD NOV PY 1995 VL 38 IS 11 BP 2300 EP 2312 DI 10.1080/00140139508925269 PG 13 WC Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Engineering; Psychology GA TE257 UT WOS:A1995TE25700012 PM 7498189 ER PT J AU HUNSUCKER, RD COKER, C COOK, J LOTT, G AF HUNSUCKER, RD COKER, C COOK, J LOTT, G TI AN INVESTIGATION OF THE FEASIBILITY OF UTILIZING GPS/TEC SIGNATURES FOR NEAR-REAL TIME FORECASTING OF AURORAL-E PROPAGATION AT HIGH-HF AND LOW-VHF FREQUENCIES SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article AB VHF propagation on polar paths up to 5300 KM in length has been documented during the maximum phase of sunspot cycle 19 (1957-58). Mode analysis on these polar paths has shown that auroral-E ionization (AEI) supported some modes, Incoherent scatter radars (ISR's) and ionosondes have also measured electron densities and plasma frequencies which could support AEI modes at frequencies up to 46 MHz. Long distance VHF propagation from AEI has also been reported by radio amateurs using frequencies in the 2m Amateur Band (144-146 MHz) in a ''sidescatter mode.'' An AEI experiment has been in operation between Wales and Fairbanks (Alaska) since mid-August 1991. A 75-watt CW watt transmitter located in Wales, Alaska transmits the Morse letter ''R'' every 5 s continuously, and a receiver located in Fairbanks detects the 25.5 MHz signal whenever AEI is present near the midpoint of the 960 km path. Another experiment is presently underway using a GPS total electron content (TEC) receiving station at Fairbanks also using AEI data from the Wales-Fairbanks experiment. From this experiment, we have examined 58 passes of GPS satellites whose E-layer penetration points lie close to the midpoint of the Wales-Fairbanks path and found that there is a threshold value Of TEC above which auroral-E (AE) propagation occurs. We also have found that AEI propagation is strongly correlated with large- and medium-scale E-region structures in TEC determined by the GPS measurements, When TEC ionospheric structures are not present near the Wales-Fairbanks path midpoint, no AEI signal is received, We tentatively conclude that the occurrence of these specific TEC signatures may be utilized as predictors of AEI forward propagation on paths within and parallel to the auroral oval, This experiment ended in the summer of 1995. C1 UNIV TEXAS,APPL RES LABS,AUSTIN,TX 78713. USN,POSTGRAD SCH,ECAB,MONTEREY,CA 93943. RP HUNSUCKER, RD (reprint author), RP CONSULTANTS,FAIRBANKS,AK 99709, USA. NR 19 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD NOV PY 1995 VL 43 IS 11 BP 1313 EP 1318 DI 10.1109/8.475104 PG 6 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA TE900 UT WOS:A1995TE90000017 ER PT J AU Helmick, RE Blair, WD Hoffman, SA AF Helmick, RE Blair, WD Hoffman, SA TI Fixed-interval smoothing for Markovian switching systems SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Article DE Markovian switching systems; fixed-interval smoothing; Interacting Multiple Model (IMM) algorithms; Generalized Pseudo-Bayesian (GPB) algorithms AB A suboptimal approach to the fixed-interval smoothing problem for Markovian switching systems is examined in this paper, A smoothing algorithm is developed that uses two multiple-model filters, where one of the filters propagates in the forward-time direction and the other one propagates in the backward-time direction, A backward-time filtering algorithm based on the Interacting Multiple Model concept is also developed, Results from a simulation example are given to illustrate the performance of the smoothing algorithm with respect to that of filtering. RP Helmick, RE (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,SYST RES & TECHNOL DEPT,CODE B32,DAHLGREN,VA 22448, USA. NR 10 TC 69 Z9 72 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD NOV PY 1995 VL 41 IS 6 BP 1845 EP 1855 DI 10.1109/18.476310 PN 2 PG 11 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA TR238 UT WOS:A1995TR23800005 ER PT J AU KEMNER, KM HARRIS, VG ELAM, WT FENG, YC LAUGHLIN, DE WOICIK, JC AF KEMNER, KM HARRIS, VG ELAM, WT FENG, YC LAUGHLIN, DE WOICIK, JC TI POLARIZATION-DEPENDENT XAFS STUDIES ON THE ROLE OF TA IN THE COMPOSITIONAL SEGREGATION OF CO-CR-TA MAGNETIC RECORDING MEDIA SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 33rd Annual Intermag Conference CY APR 18-21, 1995 CL SAN ANTONIO, TX ID ABSORPTION FINE-STRUCTURE AB Extended x-ray absorption fine structure (EXAFS) measurements of Ta in Co-Cr-Ta films were performed using normal and glancing incident radiation in order to investigate, respectively, the in-plane and out-of-plane local structure and chemistry about the Ta atom sites. The Fourier transformed EXAFS data illustrates the presence of an anisotropy between the in-plane and out-of-plane structures around the Ta atoms, indicating that the Ta atoms are incorporated in a closed-packed structure with the c-axis aligned in the plane of the film. Analysis of the local environments around Ta indicates that the Ta atoms are either randomly distributed throughout the film or have preferentially segregated to the Cr-rich regions. Results indicate that an increase in disposition temperature results in Ta having a broader distribution of first-neighbor distances as well as a slight decrease in the number of surrounding atoms. This is consistent with a local structure model which has vacancies preferentially segregating to the Ta atoms thereby decreasing the diffusion of Cr within the grains. C1 CARNEGIE MELLON RES INST,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15213. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP KEMNER, KM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 10 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 2806 EP 2808 DI 10.1109/20.490158 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD556 UT WOS:A1995TD55600073 ER PT J AU BUCHOLTZ, F DAGENAIS, DM VILLARRUEL, CA KIRKENDALL, CK MCVICKER, JA DAVIS, AR PATRICK, SS KOO, KP WANG, G VALO, H EIDEM, EJ ANDERSEN, A LUND, T GJESSING, R KNUDSEN, T AF BUCHOLTZ, F DAGENAIS, DM VILLARRUEL, CA KIRKENDALL, CK MCVICKER, JA DAVIS, AR PATRICK, SS KOO, KP WANG, G VALO, H EIDEM, EJ ANDERSEN, A LUND, T GJESSING, R KNUDSEN, T TI DEMONSTRATION OF A FIBER OPTIC ARRAY OF 3-AXIS MAGNETOMETERS FOR UNDERSEA APPLICATION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 33rd Annual Intermag Conference CY APR 18-21, 1995 CL SAN ANTONIO, TX AB We describe an undersea array of eight fiber-optic, three-axis magnetic sensors, The interferometric sensors employ magnetostrictive metallic glass strips as the transducer elements. We discuss the operating principles and the performance of the system during actual undersea operation. C1 NORWEGIAN DEF RES ESTAB,KJELLER,NORWAY. SFA INC,LANDOVER,MD 20785. UNIV RES FDN,GREENBELT,MD. VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. RP BUCHOLTZ, F (reprint author), USN,RES LAB,CODE 5675,WASHINGTON,DC 20375, USA. NR 4 TC 4 Z9 6 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 3194 EP 3196 DI 10.1109/20.490325 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD556 UT WOS:A1995TD55600194 ER PT J AU CHAKARIAN, V IDZERDA, YU MEIGS, G CHEN, CT AF CHAKARIAN, V IDZERDA, YU MEIGS, G CHEN, CT TI APPLICATIONS OF SOFT-X-RAY MAGNETIC CIRCULAR-DICHROISM SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 33rd Annual Intermag Conference CY APR 18-21, 1995 CL SAN ANTONIO, TX ID ULTRATHIN FILMS; MULTILAYERS; SURFACE; EDGES AB Several recent examples of the application of soft X-ray magnetic circular dichroism (SX-MCD) in the study of magnetic systems are presented. First, the applicability and limitations of obtaining element-specific orbital and spin moments in magnetic systems via transmission MCD method are described. As an extension of this method, spin polarized L-edge extended X-ray absorption fine structure (EXAFS) of Fe, Co, and Ni films are measured, The data show the presence of a large spin dependence in the EXAFS of Fe and Co while no measurable dependence is seen for Ni. indicating significant differences between the spin-dependent scattering potentials of Fe, Co, and Ni. To further demonstrate the applicability of SX-MCD to practical systems, two dimensional magnetic hysteresis loops of a complicated trilayer system, FeCo/Mn/FeCo, are measured for each of the constituent elements. The data indicate that Mn has a net moment in this system and is strongly coupled to the enclosing FeCo layers. Furthermore, the results show unequivocally that the Mn moment is rotated from that of Fe and Co by similar to 23 degrees and this angle is largely preserved throughout the moment reversal process. C1 USN,RES LAB,WASHINGTON,DC 20375. AT&T BELL LABS,MURRAY HILL,NJ 07974. NR 35 TC 8 Z9 8 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 3307 EP 3312 DI 10.1109/20.490368 PN 1 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD556 UT WOS:A1995TD55600226 ER PT J AU DORSEY, PC LUBITZ, P HARRIS, VG CHRISEY, DB HORWITZ, JS AF DORSEY, PC LUBITZ, P HARRIS, VG CHRISEY, DB HORWITZ, JS TI MAGNETIC-PROPERTIES OF PULSED-LASER DEPOSITED MNZN-FERRITE FILMS AS A FUNCTION OF COMPOSITION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1995 IEEE International Magnetics Conference (INTERMAG 95) CY APR 18-21, 1995 CL SAN ANTONIO, TX SP IEEE AB The magnetic properties of MnZn-ferrite films grown on (100) MgO single-crystal substrates using pulsed laser deposition were investigated as a function of composition. The structural and magnetic properties were examined using x-ray diffraction, scanning electron microscopy, x-ray fluorescence, ferrimagnetic resonance, and vibrating sample magnetometry. The films ae single phase and well oriented; however, the compositions of the films were measured to be on average about 42% deficient in Zn with excess Mn and Fe. The magnetocrystalline anisotropy field, H-A, was found to vary significantly as a function of composition such that the [001] direction could be changed from a hard to an easy direction with increasing Zn content. RP DORSEY, PC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 6 TC 6 Z9 6 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 3455 EP 3457 DI 10.1109/20.489534 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD558 UT WOS:A1995TD55800003 ER PT J AU HARRIS, VG KOON, NC WILLIAMS, CM ZHANG, Q ABE, M KIRKLAND, JP MCKEOWN, DA AF HARRIS, VG KOON, NC WILLIAMS, CM ZHANG, Q ABE, M KIRKLAND, JP MCKEOWN, DA TI DIRECT MEASUREMENT OF OCTAHEDRAL AND TETRAHEDRAL SITE ENVIRONMENTS IN NIZN-FERRITES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1995 IEEE International Magnetics Conference (INTERMAG 95) CY APR 18-21, 1995 CL SAN ANTONIO, TX SP IEEE ID ABSORPTION AB The local environment of metal ions in a series of spin-sprayed Ni0.15ZnyFe2.85-yO4 (y = 0.16, 0.23, 0.40, 0.60) films have been studied using extended x-ray absorption fine structure (EXAFS). Fourier transforms of the EXAFS data illustrate peaks which are identified with specific local atom correlations within the spinel ferrite unit cell. From these data the relative occupancy of the cations on the octahedral and tetrahedral sites are determined. We find that Ni ions occupy the octahedral sites, while the Zn ions occupy the tetrahedral sites. Fe cations occupy both sites in a ratio determined by the Zn/Fe ratio. The valence distribution of Fe ions on these sites is consistent with that of an inverted spinel. The saturation magnetization varies with increasing Zn/Fe ratio, first increasing due to the imbalance on the Fe spin lattice and later decreasing due to the disruption of the A-B superexchange. C1 MORGAN STATE UNIV,BALTIMORE,MD 21339. TOKYO INST TECHNOL,MEGURO KU,TOKYO 152,JAPAN. SFA INC,LANDOVER,MD 20785. HOWARD UNIV,WASHINGTON,DC 20059. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 13 TC 48 Z9 49 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 3473 EP 3475 DI 10.1109/20.489540 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD558 UT WOS:A1995TD55800009 ER PT J AU SNYDER, JE HARRIS, VG KOON, NC SUI, X KRYDER, MH AF SNYDER, JE HARRIS, VG KOON, NC SUI, X KRYDER, MH TI LOCAL ANISOTROPIC STRUCTURE IN AMORPHOUS BA-FE-O FILMS AND ITS ROLE IN DETERMINING MAGNETIC-ANISOTROPY IN CRYSTALLIZED BA-HEXAFERRITE FILMS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1995 IEEE International Magnetics Conference (INTERMAG 95) CY APR 18-21, 1995 CL SAN ANTONIO, TX SP IEEE ID BARIUM HEXAFERRITE; THIN-FILMS; FERRITE; MEDIA AB Ba hexaferrite films with the easy direction of magnetization perpendicular or in-plane can be prepared by crystalization of amorphous films deposited under different sputtering conditions. Using polarization-dependent EXAFS (extended x-ray absorption fine structure), we have observed anisotropic local structure around the Fe atoms in as-sputtered amorphous Ba-Fe-O films. Such structure has not been detectable by conventional structural characterization techniques (x-ray diffraction, electron diffraction and transmission electron microscopy [TEM]). The results suggest that this local structural anisotrophy determines the orientation of the fast-growing basal plane directions during post-deposition annealing and thus the directions of the c-axes and the magnetic anisotropy. C1 SEAGATE TECHNOL,BLOOMINGTON,MN 55435. CARNEGIE MELLON UNIV,CTR DATA STORAGE SYST,PITTSBURGH,PA 15213. RP SNYDER, JE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 9 TC 4 Z9 4 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 3844 EP 3846 DI 10.1109/20.489791 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD558 UT WOS:A1995TD55800131 ER PT J AU DAGENAIS, DM BUCHOLTZ, F AF DAGENAIS, DM BUCHOLTZ, F TI SLOW DYNAMICS OF METALLIC-GLASS MEASURED AT ROOM-TEMPERATURE WITH A FIBER OPTIC INTERFEROMETER SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1995 IEEE International Magnetics Conference (INTERMAG 95) CY APR 18-21, 1995 CL SAN ANTONIO, TX SP IEEE ID SENSOR AB Transversely annealed strips metallic glass have been probed using a interferometer. This technique can measure variations down to 10(-13)/root Hz. We measurements of low-frequency 1/f type stemming from localized magnetic the amorphous material. C1 SFA INC,LANDOVER,MD 20785. RP DAGENAIS, DM (reprint author), USN,RES LAB,CODE 5675,WASHINGTON,DC 20375, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 4026 EP 4028 DI 10.1109/20.489850 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD558 UT WOS:A1995TD55800190 ER PT J AU CLARK, AE TETER, JP WUNFOGLE, M RESTORFF, JB LINDBERG, JF AF CLARK, AE TETER, JP WUNFOGLE, M RESTORFF, JB LINDBERG, JF TI MAGNETIC-PROPERTIES OF RZN WITH R=TB1-XDYX(0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.6) AND R=TB1-YGDY(0-LESS-THAN-OR-EQUAL-TO-Y-LESS-THAN-OR-EQUAL-TO-0.4) SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1995 IEEE International Magnetics Conference (INTERMAG 95) CY APR 18-21, 1995 CL SAN ANTONIO, TX SP IEEE AB Magnetization, Young's moduli, and magnetostriction were measured on polycrystalline samples of Tb1-xDyxZn and Tb1-yGdyZn. The easy axis phase boundary was determined for 0 less than or equal to x less than or equal to 0.6 and 0 less than or equal to y less than or equal to 0.4. To derive temperature dependencies of Young's moduli, small transducer rings were excited into resonance at frequencies similar to 100 kHz, Estimated magnetomechanical coupling factors of polycrystalline Tb0.8Gd0.2Zn in the region of easy axis reorientation are similar to 0.6. Magnetostrictions of polycrystalline TbZn at 77 K saturated at similar to 0.2% with relatively low fields (similar to 1000 Oe), even for compressive stresses > 40 MPa. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. CLARK ASSOCIATES,ADELPHI,MD 20783. RP CLARK, AE (reprint author), CLARK ASSOCIATES,ADELPHI,MD 20783, USA. NR 4 TC 10 Z9 11 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 4032 EP 4034 DI 10.1109/20.489852 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD558 UT WOS:A1995TD55800192 ER PT J AU KROWNE, CM AF KROWNE, CM TI NONRECIPROCITY IN MAGNETOELECTRIC CRYSTALS - COMMENT SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Letter AB A more rigorous derivation is provided along with a discussion of the electric and magnetic susceptibility tensor contributions to the electric and magnetic polarizations which lead to an assessment of nonreciprocity. RP KROWNE, CM (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,MICROWAVE TECHNOL BRANCH,WASHINGTON,DC 20375, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1995 VL 31 IS 6 BP 4312 EP 4313 DI 10.1109/20.488296 PN 3 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA TD559 UT WOS:A1995TD55900005 ER PT J AU FALLER, WE SCHRECK, SJ AF FALLER, WE SCHRECK, SJ TI REAL-TIME PREDICTION OF UNSTEADY AERODYNAMICS - APPLICATION FOR AIRCRAFT CONTROL AND MANEUVERABILITY ENHANCEMENT SO IEEE TRANSACTIONS ON NEURAL NETWORKS LA English DT Article AB The capability to control unsteady separated how fields could dramatically enhance aircraft agility, To enable control, however, real-time prediction of these flow fields over a broad parameter range must be realized, The present work describes real-time predictions of three-dimensional unsteady separated flow fields and aerodynamic coefficients using neural networks, Unsteady surface-pressure readings were obtained from an airfoil pitched at a constant rate through the static stall angle, All data sets were comprised of 15 simultaneously acquired pressure records and one pitch angle record, Five such records and the associated pitch angle histories were used to train the neural network using a time-series algorithm, Post-training, the input to the network was the pitch angle (alpha), the angular velocity (d alpha/dt), and the initial 15 recorded surface pressures at time (t(0)), Subsequently, the time (t + Delta t) network predictions, for each of the surface pressures, were fed back as the input to the network throughout the pitch history, The results indicated that the neural network accurately predicted the unsteady separated flow fields as well as the aerodynamic coefficients to within 5% of the experimental data, Consistent results were obtained both for the training set as well as for generalization to both other constant pitch rates and to sinusoidal pitch motions. The results clearly indicated that the neural-network model could predict the unsteady surface-pressure distributions and aerodynamic coefficients based solely on angle of attack information, The capability for real-time prediction of both unsteady separated flow fields and aerodynamic coefficients across a wide range of parameters in turn provides a critical step towards the development of control systems targeted at exploiting unsteady aerodynamics for aircraft maneuverability enhancement. C1 CARDEROCK DIV NSWC,BETHESDA,MD 20084. USAF ACAD,FRANK J SEILER RES LAB,COLORADO SPRINGS,CO 80840. RP FALLER, WE (reprint author), JOHNS HOPKINS UNIV,DEPT MECH ENGN,BALTIMORE,MD 21218, USA. NR 19 TC 24 Z9 25 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1045-9227 J9 IEEE T NEURAL NETWOR JI IEEE Trans. Neural Netw. PD NOV PY 1995 VL 6 IS 6 BP 1461 EP 1468 DI 10.1109/72.471362 PG 8 WC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA TC776 UT WOS:A1995TC77600016 PM 18263439 ER PT J AU FARGUES, MP FERREIRA, MP AF FARGUES, MP FERREIRA, MP TI INVESTIGATIONS IN THE NUMERICAL BEHAVIOR OF THE ADAPTIVE RANK-REVEALING QR FACTORIZATION SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Note AB We present a tracking procedure based on the rank-revealing QR (RRQR) factorization and investigate its numerical properties by applying it to the direction-of-arrival problem. We address numerical issues raised by the related work proposed earlier by Prasad et at, and we compare the performance of the proposed algorithm to that obtained using an EVD-based technique. RP FARGUES, MP (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 8 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD NOV PY 1995 VL 43 IS 11 BP 2787 EP 2791 DI 10.1109/78.482127 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA TG258 UT WOS:A1995TG25800031 ER PT J AU Rowe, NC Laitinen, K AF Rowe, NC Laitinen, K TI Semiautomatic disabbreviation of technical text SO INFORMATION PROCESSING & MANAGEMENT LA English DT Article AB Abbreviations adversely affect information retrieval and text comprehensibility. We describe a software tool to decipher abbrevations by finding their whole-word equivalents or ''disabbreviations''. It uses a large English dictionary and a rule-based system to guess the most-likely candidates, with users having final approval. The rule-based system uses a variety of knowledge to limit its search, including phonetics, known methods of constructing multiword abbrevations, and analogies to previous abbreviations. The tool is especially helpful for retrieval from computer programs, a form of technical text in which abbreviations are notoriously common; disabbreviation of programs can make programs more reusable, improving software engineering. It also helps decipher the often-specialized abbreviations in technical captions. Experimental results confirm that the prototype tool is easy to use, finds many correct disabbreviations, and improves text comprehensibility. RP Rowe, NC (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,CODE CS-RP,MONTEREY,CA 93943, USA. NR 13 TC 7 Z9 7 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0306-4573 J9 INFORM PROCESS MANAG JI Inf. Process. Manage. PD NOV PY 1995 VL 31 IS 6 BP 851 EP 857 DI 10.1016/0306-4573(95)00013-7 PG 7 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA TK446 UT WOS:A1995TK44600005 ER PT J AU Larson, GE Haier, RJ LaCasse, L Hazen, K AF Larson, GE Haier, RJ LaCasse, L Hazen, K TI Evaluation of a ''mental effort'' hypothesis for correlations between cortical metabolism and intelligence SO INTELLIGENCE LA English DT Article ID POSITRON EMISSION TOMOGRAPHY; CEREBRAL BLOOD-FLOW; WORKING-MEMORY; HUMAN-BRAIN; INDIVIDUAL-DIFFERENCES; VERBAL FLUENCY; BACKWARD; LOCALIZATION; ACTIVATION; CAPACITY AB Previous research indicates that low scores on the Raven's Advanced Progressive Matrices (RAPM) test are associated with increased cortical glucose utilization during problem solving. We hypothesized that previous results may reflect the neurophysiological consequences of patterns of effort requirements; that is, high-effort expenditure from lower aptitude participants (for whom the problems are hard) and low-effort expenditure from higher aptitude participants (for whom the problems are easy). In this experiment, positron emission tomography (PET) data were gathered on participants (N = 28) who solved easy and hard problems that were tailored to the participants' own ability levels, thereby eliminating aptitude group differences in effort requirements. Contrary to previous results, high aptitude was associated with high cortical glucose use. Average aptitude participants showed diminished glucose use in the hard condition. A significant Group x Condition x Hemisphere Effect was also noted, with greater right hemisphere activation in the hard condition for the high-aptitude group. These results demonstrate that the relation of cerebral glucose use and cognitive ability is sensitive to participant and task selection. C1 UNIV CALIF IRVINE,BRAIN IMAGING CTR,IRVINE,CA 92717. RP Larson, GE (reprint author), USN,CTR PERSONNEL RES & DEV,53335 RYNE RD,SAN DIEGO,CA 92152, USA. NR 31 TC 49 Z9 49 U1 0 U2 2 PU ABLEX PUBL CORP PI NORWOOD PA 355 CHESTNUT ST, NORWOOD, NJ 07648 SN 0160-2896 J9 INTELLIGENCE JI Intelligence PD NOV-DEC PY 1995 VL 21 IS 3 BP 267 EP 278 DI 10.1016/0160-2896(95)90017-9 PG 12 WC Psychology, Multidisciplinary SC Psychology GA UJ216 UT WOS:A1995UJ21600002 ER PT J AU HAGAN, KJ AF HAGAN, KJ TI 100 YEARS OF SEA POWER - THE UNITED-STATES-NAVY, 1890-1990 - BAER,GW SO INTERNATIONAL HISTORY REVIEW LA English DT Book Review RP HAGAN, KJ (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ROYAL ROADS MILITARY COLL PI VICTORIA PA FLEET MAIL OFFICE, VICTORIA BC V0S 1B0, CANADA SN 0707-5332 J9 INT HIST REV JI Int. Hist. Rev. PD NOV PY 1995 VL 17 IS 4 BP 804 EP 807 PG 4 WC History SC History GA TK964 UT WOS:A1995TK96400032 ER PT J AU HAGAN, KJ AF HAGAN, KJ TI HOW NAVIES FIGHT - THE UNITED-STATES-NAVY AND ITS ALLIES - UHLIG,F SO INTERNATIONAL HISTORY REVIEW LA English DT Book Review RP HAGAN, KJ (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ROYAL ROADS MILITARY COLL PI VICTORIA PA FLEET MAIL OFFICE, VICTORIA BC V0S 1B0, CANADA SN 0707-5332 J9 INT HIST REV JI Int. Hist. Rev. PD NOV PY 1995 VL 17 IS 4 BP 804 EP 807 PG 4 WC History SC History GA TK964 UT WOS:A1995TK96400033 ER PT J AU Bendat, JS Coppolino, RN Palo, PA AF Bendat, JS Coppolino, RN Palo, PA TI Identification of physical parameters with memory in non-linear systems SO INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS LA English DT Article AB A new technique called 'Reverse MI/SO' has been developed that greatly simplifies the identification of parameters in systems with amplitude non-linearities and frequency-dependent coefficients as described by non-linear integro-differential equations of motion. This paper illustrates the technique for single degree-of-freedom (SDOF) non-linear systems where linear and non-linear damping is described by memory functions of an exponential and exponential-cosine analytical form. Comparisons between analytical and numerical simulation results prove that the Reverse MI/SO technique is quite robust. A discussion is included outlining the importance of this new technique as applied to the (non-linear) dynamics of ships and stability studies. C1 MEASUREMENT ANAL CORP,TORRANCE,CA 90505. USN,CTR FACILITIES ENGN SERV,PORT HUENEME,CA 93043. RP Bendat, JS (reprint author), JS BENDAT CO,833 MORAGA DR,LOS ANGELES,CA 90049, USA. NR 8 TC 15 Z9 15 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7462 J9 INT J NONLINEAR MECH JI Int. J. Non-Linear Mech. PD NOV PY 1995 VL 30 IS 6 BP 841 EP 860 DI 10.1016/0020-7462(95)00023-2 PG 20 WC Mechanics SC Mechanics GA TL187 UT WOS:A1995TL18700005 ER PT J AU HILL, RA REDDI, S KENNEY, ME RYAN, J LIAW, LH GARRETT, J SHIRK, J CHENG, GZ KRASIEVA, T BERNS, MW AF HILL, RA REDDI, S KENNEY, ME RYAN, J LIAW, LH GARRETT, J SHIRK, J CHENG, GZ KRASIEVA, T BERNS, MW TI PHOTODYNAMIC THERAPY OF OCULAR MELANOMA WITH BIS SILICON 2,3-NAPHTHALOCYANINE IN A RABBIT MODEL SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Article DE LASER; MELANOMA; OCULAR TUMOR; PHOTODYNAMIC THERAPY ID CHLOROALUMINUM SULFONATED PHTHALOCYANINE; MALIGNANT-MELANOMA; TUMORS; PHOTORADIATION; NAPHTHALOCYANINE; MECHANISM; DAMAGE; TISSUE; CELLS AB Purpose. To investigate bis (tri-n-hexylsiloxy) silicon 2,3-naphthalocyanine (SINc; 0.5 mg/kg) for photodynamic therapy of an experimental ocular melanoma in pigmented rabbits. Methods. SINc was dissolved in canola oil by heating, emulsified with Tween 80, and administered by ear vein. Pharmacokinetics were studied in frozen tumor sections by fluorescence microscopy using a charge coupled device, camera-based, low-light detection system with digital image processing at 1 and 24 hours. A Ti:sapphire laser and a microlens were used to deliver the light (770 nm; 40 mW/cm(2); 20 J/cm(2)). A control rabbit received light without SINc. Results. Localization studies of SINc showed intravascular distribution shifting to a tumor stromal and perivascular distribution 24 hours after treatment. Tissue thermal damage after irradiation was minimal in the control. Exudative retinal detachments were not observed. Tumor destruction was observed, with sharp demarcation to a depth of 3.5 mm. Conclusions. Tumor light penetration was good at 770 nm, and thermal effects from the exciting light alone were minimal. Photodynamic therapy with SINc resulted in localized tumor destruction reflecting the light beam path without damage to adjacent tissue or intraocular complications. C1 UNIV CALIF IRVINE, BECKMAN LASER INST & MED CLIN, IRVINE, CA 92715 USA. CASE WESTERN RESERVE UNIV, DEPT CHEM, CLEVELAND, OH 44106 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP HILL, RA (reprint author), UNIV CALIF IRVINE, DEPT OPHTHALMOL, 1 MED PLAZA DR, IRVINE, CA 92717 USA. RI Kenney, Malcolm/C-6101-2011 FU NCI NIH HHS [CA46281] NR 23 TC 8 Z9 9 U1 0 U2 3 PU ASSOC RESEARCH VISION OPHTHALMOLOGY INC PI ROCKVILLE PA 12300 TWINBROOK PARKWAY, ROCKVILLE, MD 20852-1606 USA SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD NOV PY 1995 VL 36 IS 12 BP 2476 EP 2481 PG 6 WC Ophthalmology SC Ophthalmology GA TD020 UT WOS:A1995TD02000020 PM 7591637 ER PT J AU Howard, RM Kersh, JM Schmidt, DC AF Howard, RM Kersh, JM Schmidt, DC TI Effects of a closely coupled static and oscillating canard SO JOURNAL OF AIRCRAFT LA English DT Note RP Howard, RM (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,CODE AA HO,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD NOV-DEC PY 1995 VL 32 IS 6 BP 1390 EP 1391 DI 10.2514/3.46890 PG 2 WC Engineering, Aerospace SC Engineering GA TK779 UT WOS:A1995TK77900031 ER PT J AU Tai, TC Carico, D AF Tai, TC Carico, D TI Simulation of DD-963 ship airwake by Navier-Stokes method SO JOURNAL OF AIRCRAFT LA English DT Note RP Tai, TC (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,SEA BASED AVIAT OFF,BETHESDA,MD 20084, USA. NR 0 TC 7 Z9 9 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD NOV-DEC PY 1995 VL 32 IS 6 BP 1399 EP 1401 DI 10.2514/3.46892 PG 3 WC Engineering, Aerospace SC Engineering GA TK779 UT WOS:A1995TK77900035 ER PT J AU VALENTINE, JL KEARNS, GL SPARKS, C LETZIG, LG VALENTINE, CR SHAPPELL, SA NERI, DF DEJOHN, CA AF VALENTINE, JL KEARNS, GL SPARKS, C LETZIG, LG VALENTINE, CR SHAPPELL, SA NERI, DF DEJOHN, CA TI GC-MS DETERMINATION OF AMPHETAMINE AND METHAMPHETAMINE IN HUMAN URINE FOR 12 HOURS FOLLOWING ORAL-ADMINISTRATION OF DEXTRO-METHAMPHETAMINE - LACK OF EVIDENCE SUPPORTING THE ESTABLISHED FORENSIC GUIDELINES FOR METHAMPHETAMINE CONFIRMATION SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID CHROMATOGRAPHY MASS-SPECTROMETRY; HUMAN-LIVER; METABOLISM; CYTOCHROME-P-450; PHARMACOKINETICS; OXIDATION; CAFFEINE; AMINES C1 ARKANSAS CHILDRENS HOSP,TOXICOL & THERAPEUT LAB,LITTLE ROCK,AR 72202. NATL CTR TOXICOL RES,DIV GENET TOXICOL,JEFFERSON,AR 72079. USN,AF,US ATALANTIC FLEET,NORFOLK,VA 23511. HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,CIRCADIAN & SLEEP DISORDERS MED LAB,BOSTON,MA 02115. CIVIL AEROMED INST,FED AVIAT ADM,TOXICOL & ACCIDENT RES LAB,OKLAHOMA CITY,OK 73125. RP VALENTINE, JL (reprint author), UNIV ARKANSAS MED SCI HOSP,DEPT PEDIAT,PEDIAT CLIN PHARMACOL SECT,LITTLE ROCK,AR 72202, USA. RI Neri, Dario/P-4368-2016 NR 36 TC 25 Z9 25 U1 0 U2 3 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol PD NOV-DEC PY 1995 VL 19 IS 7 BP 581 EP 590 PG 10 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA TD642 UT WOS:A1995TD64200009 PM 8577182 ER PT J AU RACKE, MK SCOTT, DE QUIGLEY, L GRAY, GS ABE, R JUNE, CH PERRIN, PJ AF RACKE, MK SCOTT, DE QUIGLEY, L GRAY, GS ABE, R JUNE, CH PERRIN, PJ TI DISTINCT ROLES FOR B7-1 (CD-80) AND B7-2 (CD-86) IN THE INITIATION OF EXPERIMENTAL ALLERGIC ENCEPHALOMYELITIS SO JOURNAL OF CLINICAL INVESTIGATION LA English DT Article DE ALLERGIC ENCEPHALOMYELITIS; AUTOIMMUNE DISEASE; B7; T LYMPHOCYTE; T CELL COSTIMULATION ID T-CELL ACTIVATION; CTLA-4 COUNTER-RECEPTOR; MYELIN BASIC-PROTEIN; LYMPHOCYTES-T; MONOCLONAL-ANTIBODY; ADDITIONAL LIGAND; PERTUSSIS TOXIN; ANTIGEN; CD28; EXPRESSION AB The activation and differentiation of T cells require both antigen/MHC recognition and costimulatory signals, The present studies examined the role of B7-1 (CD80) and B72 (CD86) costimulation in the prototypic autoimmune disorder, experimental allergic encephalomyelitis (EAE), In adoptively transferred EAE, in vitro activation of myelin basic protein (MBP)-specific lymph node cells was inhibited by the combination of anti-CD80 plus anti-CD86, but not individually, However, in actively induced disease, one injection of anti-CD80 significantly reduced disease, while anti-CD86 exacerbated disease, Interestingly, one injection of CTLA-4Ig suppressed disease, while multiple injections resulted in enhanced disease. Thus, the costimulation provided by B7-1 molecules appears to be important for the development of encephalitogenic T cells. The enhanced disease caused by multiple injections of CTLA-4Ig or a single injection of anti-CD86 suggests an inhibitory function for CD86 interaction with its counterreceptors CD28 and CTLA-4 in EAE. Alternatively, these results are consistent with an essential timing requirement for the coordinated interaction of B7 and CD28 family receptors, and that disruption of this critical timing can have opposing results on the outcome of an immune response. C1 NINCDS,NEUROIMMUNOL BRANCH,BETHESDA,MD 20892. US FDA,BETHESDA,MD 20892. REPLIGEN CORP,CAMBRIDGE,MA 02139. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. RP RACKE, MK (reprint author), WASHINGTON UNIV,SCH MED,DEPT NEUROL,BOX 8111,660 S EUCLID AVE,ST LOUIS,MO 63110, USA. NR 58 TC 169 Z9 169 U1 0 U2 0 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0021-9738 J9 J CLIN INVEST JI J. Clin. Invest. PD NOV PY 1995 VL 96 IS 5 BP 2195 EP 2203 DI 10.1172/JCI118274 PG 9 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA TC979 UT WOS:A1995TC97900016 PM 7593605 ER PT J AU ONG, JJC CHA, YM KRIETT, JM BOYCE, K FELD, GK CHEN, PS AF ONG, JJC CHA, YM KRIETT, JM BOYCE, K FELD, GK CHEN, PS TI THE RELATION BETWEEN ATRIAL-FIBRILLATION WAVE-FRONT CHARACTERISTICS AND ACCESSORY PATHWAY CONDUCTION SO JOURNAL OF CLINICAL INVESTIGATION LA English DT Article DE WOLFF-PARKINSON-WHITE SYNDROME; ELECTROPHYSIOLOGY; SOURCE-SINK RELATIONSHIP; IMPULSE PROPAGATION; SAFETY FACTOR ID PARKINSON-WHITE SYNDROME; CONCEALED CONDUCTION; PREEXCITATION SYNDROME; CURVATURE; REPOLARIZATION; PROPAGATION AB Although the source-sink relationship for impulse propagation in cardiac tissues has been demonstrated in vitro, there has been no verification of this hypothesis in humans. Accordingly, eight patients undergoing surgical division of their accessory pathways were studied, A 56-channel (7 X 8) bipolar plaque electrode array was placed over the atrioventricular groove on the accessory pathway and atrial fibrillation electrically induced, 10 episodes of QRS transition from consecutively preexcited to nonpreexcited complexes were analyzed. This showed that consecutively preexcited QRS complexes were always associated with uniform large atrial wavefronts, Immediately prior to QRS transition, four general types of changes were observed: (a) premature invasion by secondary wavefronts creating local conduction block (n = 5); (b) wavefront collision leading to wavefront curvature (n = 2); (c) transition from a uniform large atrial wavefront to multiple fractionated small wavefronts (n = 1); and (d) uniform atrial wavefronts ''marching'' into the accessory pathway refractory period (n = 2), We conclude that local atrial wavefront characteristics are important factors influencing impulse propagation through the accessory pathway, The findings that local wavefront collision, curvature, or fractionation often precede loss of accessory pathway conduction support the notion that source-sink relationship is an important determinant of the safety factor for impulse propagation in the human heart. C1 UNIV CALIF LOS ANGELES,SCH MED,LOS ANGELES,CA 90048. UCSD,MED CTR,DEPT MED,DIV CARDIOL,SAN DIEGO,CA 92103. UCSD,MED CTR,DEPT SURG,DIV CARDIOVASC SURG,SAN DIEGO,CA 92103. USN HOSP,DEPT MED,DIV CARDIOL,SAN DIEGO,CA 92103. RP ONG, JJC (reprint author), CEDARS SINAI MED CTR,DEPT MED,DIV CARDIOL,ELECTROPHYSIOL SECT,ROOM 5342,8700 BEVERLY BLVD,LOS ANGELES,CA 90048, USA. FU NHLBI NIH HHS [HL-52319, HL-50259] NR 21 TC 20 Z9 20 U1 0 U2 0 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0021-9738 J9 J CLIN INVEST JI J. Clin. Invest. PD NOV PY 1995 VL 96 IS 5 BP 2284 EP 2296 DI 10.1172/JCI118284 PG 13 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA TC979 UT WOS:A1995TC97900026 PM 7593615 ER PT J AU BLACK, DK AF BLACK, DK TI UNTITLED SO JOURNAL OF CLINICAL MONITORING LA English DT Letter RP BLACK, DK (reprint author), USN,REG MED CTR,DEPT ANESTHESIOL,OAKLAND,CA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LITTLE BROWN CO PI BOSTON PA 34 BEACON STREET, BOSTON, MA 02108-1493 SN 0748-1977 J9 J CLIN MONITOR JI J. Clin. Monit. PD NOV PY 1995 VL 11 IS 6 BP 416 EP 416 DI 10.1007/BF01616754 PG 1 WC Anesthesiology SC Anesthesiology GA TE169 UT WOS:A1995TE16900013 PM 8576729 ER PT J AU GASKILL, K HERSEE, SD AF GASKILL, K HERSEE, SD TI 1995 WORKSHOP ON ORGANOMETALLIC VAPOR-PHASE EPITAXY - FOREWORD SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Editorial Material C1 USN,RES LAB,ADV MAT SYNTH LAB,WASHINGTON,DC 20375. UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1995 VL 24 IS 11 BP 1517 EP 1517 PG 1 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA TE167 UT WOS:A1995TE16700001 ER PT J AU GASKILL, DK WICKENDEN, AE DOVERSPIKE, K TADAYON, B ROWLAND, LB AF GASKILL, DK WICKENDEN, AE DOVERSPIKE, K TADAYON, B ROWLAND, LB TI THE EFFECT OF ORGANOMETALLIC VAPOR-PHASE EPITAXIAL-GROWTH CONDITIONS ON WURTZITE GAN ELECTRON-TRANSPORT PROPERTIES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 7th Biennial Workshop on Organometallic Vapor Phase Epitaxy CY APR 02-06, 1995 CL FT MYERS, FL SP Air Prod & Chem Inc, Aixtron Inc, Akzo Nobel Chem Inc, EMCORE Corp, Epitaxial Prod Int ltd, MCP Wafer Technol Ltd, MKS Instruments, Morton Int, NIMTEC Inc, Japan Energy Corp, Rockwell Int, Solkatron Chem, Thomas Swann & Co Ltd, Sci Equipment Div DE GAN; MOBILITY; ORGANOMETALLIC VAPOR PHASE EPITAXY (OMVPE) ID GALLIUM NITRIDE AB The growth issues known to effect the quality of GaN organometallic vapor phase epitaxial films are reviewed and the best 300K mobility vs electron concentration data are discussed. The data probably represent transport properties intrinsic to films grown on sapphire. From the results of Hall measurements, the unintentional donor in high quality GaN films cannot be Si since the donor ionization energy is much larger than that of films intentionally doped with Si (36 vs 26 meV). Electrical properties of a doped channel layer are shown not to be significantly different from those of thick films which implies a viable technology for conducting channel devices. It is argued that 77K Hall measurements are a useful indicator of GaN film quality and a compilation of unintentionally and Si doped data is presented. The 77K data imply that, at least over a limited range, Si-doping does not appreciably change the compensation of the GaN. The 77K data indicate that the low mobilities of films grown at low temperatures are probably not related to dopant impurities. RP GASKILL, DK (reprint author), USN,RES LAB,ADV MAT SYNTH LAB,WASHINGTON,DC 20375, USA. RI Rowland, Larry/C-4487-2008 NR 19 TC 38 Z9 38 U1 0 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1995 VL 24 IS 11 BP 1525 EP 1530 DI 10.1007/BF02676805 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA TE167 UT WOS:A1995TE16700003 ER PT J AU WICKENDEN, AE ROWLAND, LB DOVERSPIKE, K GASKILL, DK AF WICKENDEN, AE ROWLAND, LB DOVERSPIKE, K GASKILL, DK TI DOPING OF GALLIUM NITRIDE USING DISILANE SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 7th Biennial Workshop on Organometallic Vapor Phase Epitaxy CY APR 02-06, 1995 CL FT MYERS, FL SP Air Prod & Chem Inc, Aixtron Inc, Akzo Nobel Chem Inc, EMCORE Corp, Epitaxial Prod Int ltd, MCP Wafer Technol Ltd, MKS Instruments, Morton Int, NIMTEC Inc, Japan Energy Corp, Rockwell Int, Solkatron Chem, Thomas Swann & Co Ltd, Sci Equipment Div DE DISILANE; GALLIUM NITRIDE (GAN); METALORGANIC CHEMICAL VAPOR DEPOSITION (MOCVD); ORGANOMETALLIC VAPOR PHASE EPITAXY (OMVPE); SILICON DOPING ID CHEMICAL VAPOR-DEPOSITION; GAAS; LAYERS; FILMS; GAN; SI AB The silicon doping of n-type GaN using disilane has been demonstrated for films grown on sapphire substrates by low pressure organometallic vapor phase epitaxy. The binding energy of an exciton bound to a neutral Si donor has been determined from low temperature (6K) photoluminescence spectra to be 8.6 meV. Nearly complete activation of the Si impurity atom in the GaN lattice has been observed. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP WICKENDEN, AE (reprint author), USN,RES LAB,ADV MAT SYNTH LAB,CODE 6861,WASHINGTON,DC 20375, USA. RI Rowland, Larry/C-4487-2008 NR 22 TC 38 Z9 38 U1 0 U2 6 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1995 VL 24 IS 11 BP 1547 EP 1550 DI 10.1007/BF02676809 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA TE167 UT WOS:A1995TE16700007 ER PT J AU SHIN, J HSU, Y HSU, TC STRINGFELLOW, GB GEDRIDGE, RW AF SHIN, J HSU, Y HSU, TC STRINGFELLOW, GB GEDRIDGE, RW TI INSB, GASB, AND GAINSB GROWN USING TRISDIMETHYLAMINOANTIMONY SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 7th Biennial Workshop on Organometallic Vapor Phase Epitaxy CY APR 02-06, 1995 CL FT MYERS, FL SP Air Prod & Chem Inc, Aixtron Inc, Akzo Nobel Chem Inc, EMCORE Corp, Epitaxial Prod Int ltd, MCP Wafer Technol Ltd, MKS Instruments, Morton Int, NIMTEC Inc, Japan Energy Corp, Rockwell Int, Solkatron Chem, Thomas Swann & Co Ltd, Sci Equipment Div DE GASB; INSB; ORGANOMETALLIC VAPOR PHASE EPITAXY (OMVPE); TRISDIMETHYLAMINOANTIMONY ID CHEMICAL VAPOR-DEPOSITION; TRIISOPROPYLANTIMONY; MOVPE; TERTIARYBUTYLDIMETHYLANTIMONY; TRIMETHYLINDIUM AB GaInSb alloys as well as the constituent binaries InSb and GaSb have been grown by organometallic vapor phase epitaxy using the new antimony precursor trisdimethylaminoantimony (TDMASb) combined with conventional group III precursors trimethylindium (TMIn) and trimethylgallium (TMGa). InSb layers were grown at temperatures between 275 and 425 degrees C. The low values of V/III ratio required to obtain good morphologies at the lowest temperatures indicate that the pyrolysis temperature is low for TDMASb. In fact, at the lowest temperatures, the InSb growth efficiency is higher than for other antimony precursors, indicating the TDMASb pyrolysis products assist with TMIn pyrolysis. A similar, but less pronounced trend is observed for GaSb growth at temperatures of less than 500 degrees C. No excess carbon contamination is observed for either the InSb or GaSb layers. Ga1-xInxSb layers with excellent morphologies with values of x between 0 and 0.5 were grown on GaSb substrates without the use of graded layers. The growth temperature was 525 degrees C and the values of V/III ratio, optimized for each value of x, ranged between 1.25 and 1.38. Strong photoluminescence (PL) was observed for values of x of less than 0.3, with values of halfwidth ranging from 13 to 16 meV, somewhat smaller than previous reports for layers grown using conventional precursors without the use of graded layers at the interface. The PL intensity was observed to decrease significantly for higher values of x. The PL peak energies were found to track the band gap energy; thus, the luminescence is due to band edge processes. The layers were all p-type with carrier concentrations of approximately 10(17) cm(-3). Transmission electron diffraction studies indicate that the Ga0.5In0.5Sb layers are ordered. Two variants of the Cu-Pt structure are observed with nearly the same diffracted intensities. This is the first report of ordering in GaInSb alloys. C1 USN,CTR AIR WARFARE,CHINA LAKE,CA 93555. RP SHIN, J (reprint author), UNIV UTAH,DEPT MAT SCI & ENGN,SALT LAKE CITY,UT 84112, USA. NR 23 TC 16 Z9 16 U1 4 U2 9 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1995 VL 24 IS 11 BP 1563 EP 1569 DI 10.1007/BF02676812 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA TE167 UT WOS:A1995TE16700010 ER PT J AU TADAYON, B TWIGG, ME FATEMI, M FRANKEL, MY GIORDANA, A KATZER, DS AF TADAYON, B TWIGG, ME FATEMI, M FRANKEL, MY GIORDANA, A KATZER, DS TI CHARACTERIZATION OF LOW RANGE GAAS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE ANNEAL; LOW RANGE GAAS; LOW TEMPERATURE GAAS; MOLECULAR BEAM EPITAXY (MBE) ID LOW-TEMPERATURE GAAS; MOLECULAR-BEAM EPITAXY; LOW SUBSTRATE TEMPERATURES; BUFFER; LAYERS; 200-DEGREES-C; MESFETS; BAND; MBE AB We present the results of a study of GaAs material grown at substrate temperatures below 250 degrees C (low range GaAs) by molecular beam epitaxy. This material is amorphous and highly resistive and can be converted to single crystal through annealing process. The crystallization process is investigated by transmission electron microscopy, reflection high-energy electron diffraction, and double-crystal x-ray diffraction techniques. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. RP TADAYON, B (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 25 TC 1 Z9 1 U1 1 U2 3 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD NOV PY 1995 VL 24 IS 11 BP 1753 EP 1758 DI 10.1007/BF02676845 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA TE167 UT WOS:A1995TE16700043 ER PT J AU WIZEL, B HOUGHTEN, RA PARKER, KC COLIGAN, JE CHURCH, P GORDON, DM BALLOU, WR HOFFMAN, SL AF WIZEL, B HOUGHTEN, RA PARKER, KC COLIGAN, JE CHURCH, P GORDON, DM BALLOU, WR HOFFMAN, SL TI IRRADIATED SPOROZOITE VACCINE INDUCES HLA-B8-RESTRICTED CYTOTOXIC T-LYMPHOCYTE RESPONSES AGAINST 2 OVERLAPPING EPITOPES OF THE PLASMODIUM-FALCIPARUM SPOROZOITE SURFACE PROTEIN-2 SO JOURNAL OF EXPERIMENTAL MEDICINE LA English DT Article ID IMMUNODEFICIENCY-VIRUS TYPE-1; HUMAN MALARIA PARASITE; CIRCUMSPOROZOITE PROTEIN; PEPTIDE BINDING; CELL EPITOPES; ANCHOR RESIDUES; SPECIFICITY; MOLECULES; SEQUENCE; ANTIGEN AB Vaccines designed to protect against malaria by inducing CD8(+) cytotoxic T lymphocytes (CTL) in individuals of diverse HLA backgrounds must contain multiple conserved epitopes from various preerythrocytic-stage antigens. Plasmodium falciparum sporozoite surface protein 2 (PfSSP2) is considered an important antigen for inclusion in such vaccines, because CD8(+) CTL against the P. yoelii SSP2 protect mice against malaria by eliminating infected hepatocytes. To develop PfSSP2 as a component of malaria vaccines, we investigated the presence of anti-PfSSP2 CTL in two HLA-B8(+) volunteers immunized with irradiated P. falciparum sporozoites and characterized their CTL responses using PfSSP2-derived 15-amino acid peptides bearing the HLA-B8-binding motif. Peripheral blood mononuclear cells from both volunteers stimulated with recombinant vaccinia expressing PfSSP2 displayed antigen-specific, genetically restricted, CD8(+) T cell-dependent CTL activity against autologous target cells expressing PfSSP2. Of the five HLA-B8 motif-bearing 15-mers identified in the PfSSP2 sequence, two peptides sharing a 10-amino acid overlap sensitized HLA-B8-matched target cells from both volunteers for lysis by peptide-stimulated effector;. The CTL activity was HLA-B8 restricted and dependent on CD8(+) T cells. Analysis of the three shorter peptides representing HLA-B8 motif-bearing sequences within the two positive peptides for their ability to bind to HLA-B8 in vitro, and to sensitize target cells for lysis by effecters stimulated with the 15-mers, identified two overlapping HLA-B8-restricted CTL epitopes. Available data indicate that the sequence of one CTL epitope is conserved and the other is variant among P. falciparum isolates. Circulating activated CTL against the conserved epitope could be directly identified in one of the two volunteers. The identification of two HLA-B8-restricted CTL epitopes on PfSSP2 provides data critical to developing an epitope-based anti-liver stage malaria vaccine. C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT MOLEC MICROBIOL & IMMUNOL,BALTIMORE,MD 21205. TORREY PINES INST MOLEC STUDIES,SAN DIEGO,CA 92121. HOUGHTEN PHARMACEUT INC,SAN DIEGO,CA 92121. NIAID,MOLEC STRUCT LAB,ROCKVILLE,MD 20852. WALTER REED ARMY MED CTR,WALTER REED ARMY INST RES,DEPT IMMUNOL,WASHINGTON,DC 20307. OI Parker, Kenneth/0000-0002-6282-2478 NR 64 TC 66 Z9 66 U1 0 U2 0 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0022-1007 J9 J EXP MED JI J. Exp. Med. PD NOV 1 PY 1995 VL 182 IS 5 BP 1435 EP 1445 DI 10.1084/jem.182.5.1435 PG 11 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA TB894 UT WOS:A1995TB89400026 PM 7595214 ER PT J AU ROMBERG, RW NEEDLEMAN, SB SNYDER, JJ GREEDAN, A AF ROMBERG, RW NEEDLEMAN, SB SNYDER, JJ GREEDAN, A TI METHAMPHETAMINE AND AMPHETAMINE DERIVED FROM THE METABOLISM OF SELEGILINE SO JOURNAL OF FORENSIC SCIENCES LA English DT Note DE FORENSIC SCIENCE; TOXICOLOGY; METHAMPHETAMINES; AMPHETAMINES; SELEGILINE ID CHROMATOGRAPHY MASS-SPECTROMETRY; URINE; EXCRETION; GC/MS AB Routine methamphetamine testing identified a urine specimen with inconsistent screening and confirmation results. The methamphetamine RIA screening test (Diagnostic Products Corporation) indicated a borderline positive specimen, while the achiral confirmatory GC/MS result showed 4690 ng/mL of metham-phetamine and 1895 ng/mL of amphetamine. Analysis of the specimen after derivatization with S(-)-N-trifluoroacetylprolyl chloride showed only the presence of 1-amphetamine and 1-methamphetamine. It was later learned that the individual providing the specimen had been taking Selegiline. Selegiline, (-) propynylmethamphetamine, is a monoamine oxidase inhibitor used for the treatment of Parkinson's disease. It is sold under the trade name Eldepryl. Its major metabolites are 1-methamphetamine, 1-amphetamine and N-desmethylselegiline. Urine specimens from other Selegiline users were obtained and analyzed. A characteristic metabolic pattern was noted, exemplified by a ratio of 1-methamphetamine to 1-amphetamine of about 2.8. This is in contrast to what is observed in the urine of individuals who ingest pure 1-methamphetamine, such as with Vicks Inhaler, where the 1-methamphetamine to 1-amphetamine ratio in the urine is usually greater than 8. Caution is advised when interpreting methamphetamine results without using a chiral identification technique. RP ROMBERG, RW (reprint author), USN,DRUG SCREENING LAB,POB 88 6819,GREAT LAKES,IL 60088, USA. NR 16 TC 26 Z9 26 U1 1 U2 3 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0022-1198 J9 J FORENSIC SCI JI J. Forensic Sci. PD NOV PY 1995 VL 40 IS 6 BP 1100 EP 1102 PG 3 WC Medicine, Legal SC Legal Medicine GA TH095 UT WOS:A1995TH09500035 PM 8522918 ER PT J AU MARTELL, CA LAWTON, JA AF MARTELL, CA LAWTON, JA TI ADJOINT VARIABLE SOLUTIONS VIA AN AUXILIARY OPTIMIZATION PROBLEM SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article AB The problem addressed is to obtain an initial guess for the adjoint variables along a trajectory suitable for use in an indirect optimal control method. The proposed method assumes that good estimates of the control and state histories are available. The adjoint estimates are obtained through an auxiliary unconstrained optimization problem of low dimension. The goal of this optimization problem is to find the adjoint values at nodes along the trajectory that cause the control values from the application of the minimum principle to approach the estimated control values as closely as possible in a manner consistent with the adjoint differential equations and transversality conditions. Experience has shown that the method produces adjoint variable estimates sufficiently accurate to cause convergence of a multiple-shooting indirect method. RP USN, CTR SURFACE WARFARE, DIV SPACE & SURFACE SYST, DAHLGREN, VA 22448 USA. NR 12 TC 11 Z9 11 U1 1 U2 1 PU AMER INST AERONAUTICS ASTRONAUTICS PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA SN 0731-5090 EI 1533-3884 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD NOV-DEC PY 1995 VL 18 IS 6 BP 1267 EP 1272 DI 10.2514/3.21540 PG 6 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA TE758 UT WOS:A1995TE75800007 ER PT J AU TRANKLE, TL BACHNER, SD AF TRANKLE, TL BACHNER, SD TI IDENTIFICATION OF A NONLINEAR AERODYNAMIC MODEL OF THE F-14 AIRCRAFT SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article ID PARAMETER-ESTIMATION; MEASUREMENT NOISE AB This effort identified a full subsonic flight envelope model of the aerodynamics of the F-14 aircraft, The data set consisted of 8.9 h of flight data stored as 983 separate maneuver files, The analysis used a unified system identification computer code implementing kinematic consistency, model structure determination, and parameter estimation functions, The code implements generalized filter error, encompassing both equation error and output error types of performance measures. The code can operate in a nearly automated manner, completely processing about 1 h of flight data in about 40 h of Unix workstation time. The resulting aerodynamic model represents nonlinear angle of attach, Mach number, and static flexibility effects, This model has 521 independent aerodynamic terms and 97 independent instrumentation terms. The identified model is an incremental model that adds to an existing nonlinear simulation, One and two dimensional spline functions represent the aerodynamic coefficients. C1 USN,CTR AIR WARFARE,PATUXENT RIVER,MD 20670. SYST CONTROL INC,PALO ALTO,CA 94304. NR 21 TC 11 Z9 12 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD NOV-DEC PY 1995 VL 18 IS 6 BP 1292 EP 1297 DI 10.2514/3.21544 PG 6 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA TE758 UT WOS:A1995TE75800011 ER PT J AU AGRAWAL, BN BANG, H AF AGRAWAL, BN BANG, H TI ROBUST CLOSED-LOOP CONTROL DESIGN FOR SPACECRAFT SLEW MANEUVER USING THRUSTERS SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article ID TIME-OPTIMAL CONTROL; FLEXIBLE SPACECRAFT AB In this paper, a closed-loop snitching function for on-off thruster firings is proposed to provide good attitude control performance in the presence of modeling errors for single-axis slew maneuver of a rigid spacecraft and to eliminate double-sided thruster firings. The size of a single-sided deadband in the switching function provides the capability of a tradeoff between maneuver time and fuel expenditure. The application of this switching function for the single-axis slew maneuvers of flexible spacecraft is also analyzed. The analytical simulations and experimental results demonstrate that the proposed switching function provides significant improvement in the slew maneuver performance. RP AGRAWAL, BN (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. RI Bang, Hyochoong/C-1580-2011 NR 13 TC 11 Z9 11 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD NOV-DEC PY 1995 VL 18 IS 6 BP 1336 EP 1344 DI 10.2514/3.21550 PG 9 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA TE758 UT WOS:A1995TE75800017 ER PT J AU PHILLIPS, C AF PHILLIPS, C TI TERMINAL HOMING PERFORMANCE OF SEMIACTIVE MISSILES AGAINST MULTITARGET RAIDS SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article AB The effects of low altitude multitarget raids against surface ships with command midcourse/semiactive rf terminal homing defensive missiles are investigated in terms of terminal homing miss distance. The scenario presently considered is that several defensive missiles are fired with each assigned a target to engage. A missile must engage its designated target for a successful intercept, and the miss distance is measured relative to the designated target. Raid geometry and the approach angle of the interceptor relative to the raid scintillation axis were found to be important parameters in determining miss distance. The stream raid and the closely spaced stacked raid had resolution ranges so short as to be practically unresolvable. Reasonable variations in the heading and seeker pointing errors had little effect on terminal miss distance for these unresolvable scenarios. For larger stacked raid separations, which are just resolved at handover, the handover errors can cause a loss of resolution and poor homing performance. Thus, a highly accurate handover is of use only for a band of separation spacings for the stacked raid and has little benefit against the stream raid. A method to counter the stream raid is to control the missile handover aspect angle through midcourse trajectory shaping so as to approach antiparallel to the raid velocity. For stacked raids, minimizing the handover range while using the midcourse guidance to bias the handover heading error allows more tightly spaced raids to be successfully engaged. RP PHILLIPS, C (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,17320 DAHLGREN RD,DAHLGREN,VA 22448, USA. NR 8 TC 1 Z9 1 U1 2 U2 3 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD NOV-DEC PY 1995 VL 18 IS 6 BP 1427 EP 1433 DI 10.2514/3.21564 PG 7 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA TE758 UT WOS:A1995TE75800031 ER PT J AU Su, JH Ruckman, CE AF Su, JH Ruckman, CE TI An isolated structural system using localized vibration control SO JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES LA English DT Article AB This paper describes an approach to actively isolate vibration of a complex structural system by controlling six degrees of freedom in its support areas. The controller attempts to stabilize only localized areas near where the structure is supported rather than attempting to stabilize the entire structure. Actuator/sensor placement and model reduction are discussed, and the specific controller design and performance measure are described. The relative performance levels of different control strategies are evaluated by examining a frequency-dependent disturbance rejection property. Concepts are illustrated by numerically simulating a complex structural system comprising a flat plate supported by two box girders; plant dynamics are obtained from a finite-element model. Conclusions are drawn regarding the mechanisms by which localized vibration control is exerted. RP Su, JH (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,STRUCT ACOUST & HYDROACOUST RES BRANCH,BETHESDA,MD 20084, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 1045-389X J9 J INTEL MAT SYST STR JI J. Intell. Mater. Syst. Struct. PD NOV PY 1995 VL 6 IS 6 BP 801 EP 808 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA TQ347 UT WOS:A1995TQ34700008 ER PT J AU Barrett, DJ Sullivan, BJ AF Barrett, DJ Sullivan, BJ TI A three-dimensional phase transformation model for shape memory alloys SO JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES LA English DT Article ID COMPOSITE AB Shape memory alloys have been used almost exclusively in components subjected to simple loadings such as uniaxial tension, pure bending or torsion. As part of the development of smart structures and adaptive components, shape memory alloys must be designed to function in complex, multi-dimensional stress states. In order for these materials to participate as active elements in smart structural designs, the alloys must undergo a phase transformation, during which their properties change. For one-dimensional stress states, data generated in simple stress-strain-temperature tests is sufficient to define the onset and completion of a phase transformation. When multi-dimensional stress states are encountered, data from more complicated tests will be needed to define the transformation. In this paper, a model for multi-dimensional phase transformation criteria is introduced and discussed, and tests for defining the boundaries of the initiation and completion of phase transformation surfaces are proposed. C1 MSNW INC,BLUE BELL,PA 19422. RP Barrett, DJ (reprint author), USN,CTR AIR WARF,DIV AIRCRAFT,ADV STRUCT TECHNOL BRANCH,CODE 4331,WARMINSTER,PA 18974, USA. NR 16 TC 14 Z9 15 U1 1 U2 1 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 1045-389X J9 J INTEL MAT SYST STR JI J. Intell. Mater. Syst. Struct. PD NOV PY 1995 VL 6 IS 6 BP 831 EP 839 DI 10.1177/1045389X9500600611 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA TQ347 UT WOS:A1995TQ34700011 ER PT J AU Pattabiraman, N Ward, KB Fleming, PJ AF Pattabiraman, N Ward, KB Fleming, PJ TI Occluded molecular surface: Analysis of protein packing SO JOURNAL OF MOLECULAR RECOGNITION LA English DT Article DE occluded surface; protein packing; misfolded protein structure ID GLOBULAR-PROTEINS; TERTIARY TEMPLATES; EXCLUDED VOLUME; MODELS; FOLDS; SEQUENCES; CRITERIA AB We describe a novel method to calculate the packing interactions in protein structural models, The method calculates the interatomic occluded surface areas for each atom in the protein model, The identification of, and degree of interaction with, neighboring atoms is accomplished by extending surface normals from a dot surface of each atom to the point of intersection with neighboring atoms, The combined occluded and non-occluded surface areas may be normalized for the amino acid composition of the protein providing a single parameter, the normalized protein surface ratio, which is diagnostic for native-like structures, Individual residues in the model which are in infrequent occluded surface environments may be identified, The method provides a means to explicitly describe packing densities and packing environments of individual atoms in a protein model, Finally, the method allows estimation of the complementarity between any interacting molecules, for example a ligand binding to a receptor. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. YALE UNIV,DEPT MOLEC BIOPHYS & BIOCHEM,NEW HAVEN,CT 06520. NR 38 TC 97 Z9 97 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0952-3499 J9 J MOL RECOGNIT JI J. Mol. Recognit. PD NOV-DEC PY 1995 VL 8 IS 6 BP 334 EP 344 DI 10.1002/jmr.300080603 PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA TY112 UT WOS:A1995TY11200002 PM 9052974 ER PT J AU Schaffner, AE Barker, JL Stenger, DA Hickman, JJ AF Schaffner, AE Barker, JL Stenger, DA Hickman, JJ TI Investigation of the factors necessary for growth of hippocampal neurons in a defined system SO JOURNAL OF NEUROSCIENCE METHODS LA English DT Article DE neuronal culture; hippocampus; rat embryo; X-ray photoelectron spectroscopy; surface; serum-free medium; protein adsorption ID COPLANAR MOLECULAR ASSEMBLIES; SERUM-FREE; CULTURE; MONOLAYERS; SURFACES; CELLS; FIBRONECTIN; ATTACHMENT; OUTGROWTH; GUIDANCE AB We have developed an in vitro system that combines the use of a defined medium with a chemically defined surface for the differentiation of embryonic rat hippocampal neurons. Cells were grown on silica substrates modified with two chemically distinct molecules: poly-D-lysine and an amine-containing organosilane. Cells were dissociated by mechanical or enzymatic methods and grown in serum-containing versus serum-free medium on these surfaces. Our results demonstrate that optimal survival and growth in serum-free medium occurs on the artificial surfaces. X-ray photoelectron spectroscopy (XPS) was used to analyze the surfaces both before and after cell culture. In addition, surface properties such as elemental composition, the initial thickness of the substrate material, and the thickness of material deposited during the course of cell culture were quantified after cell removal. Taken together, the results from the cell culture and surface analysis demonstrate that the media, proteins deposited from the media onto the surface, surface composition, and properties intrinsic to neuronal membranes all interact in a complex fashion to determine whether or not the cells will adhere and survive in culture. In particular,the role of material deposited from the medium onto the culture substratum may be more important than has been previously appreciated. This system allows for the study of neuronal differentiation in a well-defined environment. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP Schaffner, AE (reprint author), NATL INST HLTH,NINDS,NEUROPHYSIOL LAB,BLDG 36,ROOM 2C02,9000 ROCKVILLE PIKE,BETHESDA,MD 20892, USA. FU NICHD NIH HHS [R0I-HD31457-2] NR 35 TC 63 Z9 64 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-0270 J9 J NEUROSCI METH JI J. Neurosci. Methods PD NOV PY 1995 VL 62 IS 1-2 BP 111 EP 119 DI 10.1016/0165-0270(95)00063-1 PG 9 WC Biochemical Research Methods; Neurosciences SC Biochemistry & Molecular Biology; Neurosciences & Neurology GA TL549 UT WOS:A1995TL54900015 PM 8750092 ER PT J AU Sarpkaya, T AF Sarpkaya, T TI Hydrodynamic damping, flow-induced oscillations, and biharmonic response SO JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID VORTEX; VIBRATION; CYLINDER AB A brief review of damping damping is followed by a comparison of three sets of lift-force data for circular cylinders, subjected only to transverse oscillation Then the significance of two-dimensional or biharmonic oscillations (in both the in-line and transverse directions) is discussed in light of experiments undertaken for that purpose, to simulate more closely the true nature of flow-induced oscillations. RP Sarpkaya, T (reprint author), USN,POSTGRAD SCH,700 DYER RD,RM 339,MONTEREY,CA 93943, USA. NR 32 TC 100 Z9 102 U1 0 U2 14 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0892-7219 J9 J OFFSHORE MECH ARCT JI J. Offshore Mech. Arct. Eng. Trans. ASME PD NOV PY 1995 VL 117 IS 4 BP 232 EP 238 DI 10.1115/1.2827228 PG 7 WC Engineering, Ocean; Engineering, Mechanical SC Engineering GA TT216 UT WOS:A1995TT21600002 ER PT J AU McCormick, ME Mouring, SE AF McCormick, ME Mouring, SE TI On the hydrodynamic design of active panels of marine vehicles SO JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB The problem of active, or driven, panel motions of marine vehicles altering the turbulent boundary layer properties is discussed. The coherent (vorticular) structures in a turbulent boundary layer can be altered by the motions of a panel, causing those structures to grow more rapidly and, as a result, become prematurely unstable and burst. In addition, the motions of the panel can produce vortices that interact with those that are naturally produced, and change the character of the boundary layer. The motions of the antinodes of the panel can also increase or decrease the surface shear stress, if the panel is, respectively above ol below its mean position. The cumulative effect of the active-panel motions, then, could be to increase the boundary layer drag. An outline of the analysis of this phenomenon is presented. C1 USN ACAD,DEPT NAVAL ARCHITECTURE OCEAN & MARINE ENGN,ANNAPOLIS,MD 21402. RP McCormick, ME (reprint author), JOHNS HOPKINS UNIV,3400 N CHARLES ST,BALTIMORE,MD 21218, USA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0892-7219 J9 J OFFSHORE MECH ARCT JI J. Offshore Mech. Arct. Eng. Trans. ASME PD NOV PY 1995 VL 117 IS 4 BP 290 EP 294 DI 10.1115/1.2827236 PG 5 WC Engineering, Ocean; Engineering, Mechanical SC Engineering GA TT216 UT WOS:A1995TT21600010 ER PT J AU GREASON, KL THOMPSON, WR DOWNEY, EC LOSASSO, B AF GREASON, KL THOMPSON, WR DOWNEY, EC LOSASSO, B TI LAPAROSCOPIC PYLOROMYOTOMY FOR INFANTILE HYPERTROPHIC PYLORIC-STENOSIS - REPORT OF 11 CASES SO JOURNAL OF PEDIATRIC SURGERY LA English DT Article DE LAPAROSCOPIC PYLOROMYOTOMY; NEONATE; PYLORIC STENOSIS AB Pyloromyotomy remains the standard of care for the treatment of infantile hypertrophic pyloric stenosis. Open pyloromyotomy is effective and is the gold-standard technique. The authors report on the technique of laparoscopic pyloromyotomy. The clinical courses of the first 11 infants treated with laparoscopic pyloromyotomy were compared with the courses of 14 infants treated recently with open pyloromyotomy. The average surgical time for the laparoscopic group was 25.4 minutes. The average time (postoperatively) until full feedings was 19.0 hours. In the open pyloromyotomy group the average surgical time was 26.1 minutes, and the time until full feedings was 23.2 hours. These results are not significantly different. When compared with open pyloromyotomy, the laparoscopic approach appears to be equally safe and effective, with superior cosmetic results. The authors believe that laparoscopic pyloromyotomy is an excellent alternative procedure for the management of hypertrophic pyloric stenosis. C1 USN,MED CTR,DEPT GEN SURG,SAN DIEGO,CA 92134. CHILDRENS MED CTR,DALLAS,TX 75235. KAISER PERMANENTE MED CTR,DEPT PEDIAT SURG,SAN DIEGO,CA. CHILDRENS HOSP,DEPT PEDIAT SURG,SAN DIEGO,CA. RP GREASON, KL (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 8 TC 24 Z9 30 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0022-3468 J9 J PEDIATR SURG JI J. Pediatr. Surg. PD NOV PY 1995 VL 30 IS 11 BP 1571 EP 1574 DI 10.1016/0022-3468(95)90159-0 PG 4 WC Pediatrics; Surgery SC Pediatrics; Surgery GA TE744 UT WOS:A1995TE74400009 PM 8583327 ER PT J AU HORNING, GM COHEN, ME AF HORNING, GM COHEN, ME TI NECROTIZING ULCERATIVE GINGIVITIS, PERIODONTITIS, AND STOMATITIS - CLINICAL STAGING AND PREDISPOSING FACTORS SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE GINGIVITIS, NECROTIZING ULCERATIVE; GINGIVOSTOMATITIS, NECROTIZING; PERIODONTITIS, NECROTIZING ULCERATIVE; HIV INFECTION, COMPLICATIONS; PERIODONTAL ATTACHMENT ID DENTAL SCHOOL; CANCRUM ORIS; ETIOLOGY; MANIFESTATIONS; POPULATION; DIAGNOSIS; INFECTION; DISEASE; VIRUS; AIDS AB NECROTIZING ULCERATIVE GINGIVITIS (NUG), necrotizing ulcerative periodontitis (NUP), and necrotizing stomatitis (NS), collectively termed necrotizing gingivostomatitis (NG), represent a dramatic, but rare oral infection associated with diminished systemic resistance, including HIV infection. Over a 5-year period, 68 consecutive NG patients from a population with known HIV status were evaluated and treated. Lesions were staged (modified Pindborg), and clinical findings and predictor variables were compared to 68 random control subjects without NC. Most cases (52%) were stage 1, with necrosis of the tip of the interdental papilla only; 19% were stage 2, with the entire papilla affected; 22% had necrosis of marginal (stage 3) or attached gingiva (stage 4); and 7% were more advanced, with mucosal necrosis or bone exposure. Attachment loss was a feature of stage 2 or greater NG. Beside HIV infection, significant predisposing factors included poor oral hygiene, unusual life stress, inadequate sleep, Caucasian race, age 18 to 21 years, and recent illness. Ten of 68 NC patients were HIV-positive. These patients were older than seronegative patients, less likely to be Caucasian, and maintained better oral hygiene and sleep. HIV-positive NG cases were clinically indistinguishable from HIV-negative cases in this series. C1 USN,DENT RES INST,GREAT LAKES,IL. RP HORNING, GM (reprint author), USN,SCH DENT,NNDC,BETHESDA,MD 20889, USA. NR 53 TC 62 Z9 65 U1 0 U2 2 PU AMER ACAD PERIODONTOLOGY PI CHICAGO PA 737 NORTH MICHIGAN AVENUE, SUITE 800, CHICAGO, IL 60611-2690 SN 0022-3492 J9 J PERIODONTOL JI J. Periodont. PD NOV PY 1995 VL 66 IS 11 BP 990 EP 998 PG 9 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA TF549 UT WOS:A1995TF54900010 PM 8558402 ER PT J AU MCCLEAN, JL KLINCK, JM AF MCCLEAN, JL KLINCK, JM TI DESCRIPTION AND VORTICITY ANALYSIS OF 50-DAY OSCILLATIONS IN THE WESTERN TROPICAL REGION OF THE CME MODEL SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Article ID NORTH EQUATORIAL COUNTERCURRENT; BRAZIL CURRENT RETROFLECTION; GEOSAT ALTIMETRY; ATLANTIC-OCEAN; INDIAN-OCEAN; SEASONAL CYCLE; ROSSBY WAVES; WORLD OCEAN; SHIP DRIFTS; PACIFIC AB The WOCE Community Modeling Effort (CME) general circulation model of the North Atlantic was used to investigate the behavior, nature, and dynamics of 50-day oscillations seen in the meridional component of velocity between 5 degrees and 11 degrees N, 35 degrees and 55 degrees W. Oscillations of the meridional component of velocity, with a period of about 50 days, appear as the seasonal meander pattern of the North Equatorial Countercurrent starts to break down in December. They appear first near 35 degrees W and are advected westward. They have a westward phase velocity of about 0.1 m s(-1), wavelength of about 600 km, and a very slow eastward group velocity. Their period, phase speed, and wavelength agree with recent observations. Calculation of the leading terms from the full vorticity equation following a modal decomposition in the propagation region showed that the oscillations were first and second mode baroclinic Rossby waves. Repetition of the vorticity analysis on an undecomposed snapshot during the period of the retroflection revealed the NECC meanders also to be baroclinic Rossby waves, the same as the 50-day oscillations. These findings, together with the time evolution of the individual flow components over an annual cycle, suggested that the 50-day oscillations were the westward advected residue of the NECC meander pattern that is released as the NECC slows in December. The retroflecting North Brazil Current produces Rossby waves with very slow eastward group velocity that are advected eastward by the NECC until they reach 35 degrees W, where they dissipate. A standing wave pattern is established for several months, while the NECC is active. Once it slows, the waves are advected westward and disappear totally by May. Neither wind forcing nor barotropic instability were considered to be responsible for the oscillations in the model. C1 OLD DOMINION UNIV,DEPT OCEANOG,NORFOLK,VA 23529. RP MCCLEAN, JL (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 44 TC 9 Z9 9 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-3670 J9 J PHYS OCEANOGR JI J. Phys. Oceanog. PD NOV PY 1995 VL 25 IS 11 BP 2498 EP 2517 DI 10.1175/1520-0485(1995)025<2498:DAVAOD>2.0.CO;2 PN 1 PG 20 WC Oceanography SC Oceanography GA TH641 UT WOS:A1995TH64100003 ER PT J AU NIILER, PP PADUAN, JD AF NIILER, PP PADUAN, JD TI WIND-DRIVEN MOTIONS IN THE NORTHEAST PACIFIC AS MEASURED BY LAGRANGIAN DRIFTERS SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Article ID DRIFTING BUOYS; FLOW AB Analysis is presented of the time-dependent motion of 47 surface drifters in the northeast Pacific during fall 1987 and 16 drifters in fall and winter 1989/90. The drifters were drogued at 15-m depth and were designed to have wind-produced slips less than 2 cm s(-1) for wind speeds up to 20 m s(-1). The coherence of velocity and local wind is presented for motions with periods between 1 day and 40 days. For periods between 5 and 20 days, drogue motion at 15-m depth is found to be highly coherent with local wind with an average phase of 70 degrees to the right of the rotating wind vector. These results differ from analyses of FGGE-type drifters as reported by McNally et al. and Niiler in the same area A model of wind-produced slip as a function of drifter design is used to provide a possible explanation of the differences. A linear regression, which accounts for 20%-40% of the current variance, gives water motion at 0.5% of wind speed and 68 degrees to the right of the wind vector. Assuming an Ekman-type balance, this regression with 15-m currents yields an apparent mixing depth of 34-38 m, which is much less than the observed 60-m depth of the mixed layer. New three-parameter models for turbulent stress are presented based on these observed depth scales and regression coefficients. The model stresses rotate from downwind to crosswind at the base of the mixed layer. The model currents rotate from approximately 60 degrees to the right of the wind vector at the surface to 180 degrees to the right of the wind vector at the mixed layer base. C1 USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. RI zheng, shaojun/E-9490-2011 NR 13 TC 86 Z9 88 U1 1 U2 8 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-3670 J9 J PHYS OCEANOGR JI J. Phys. Oceanog. PD NOV PY 1995 VL 25 IS 11 BP 2819 EP 2830 DI 10.1175/1520-0485(1995)025<2819:WDMITN>2.0.CO;2 PN 2 PG 12 WC Oceanography SC Oceanography GA TH642 UT WOS:A1995TH64200002 ER PT J AU YU, KH SCHADOW, KC KRAEUTLE, KJ GUTMARK, EJ AF YU, KH SCHADOW, KC KRAEUTLE, KJ GUTMARK, EJ TI SUPERSONIC-FLOW MIXING AND COMBUSTION USING RAMP NOZZLE SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID LAYERS AB A special supersonic nozzle that features five swept ramps on its expansion side, called the RAMP nozzle, was used to enhance Mach 2 jet mixing with the surrounding air either at rest or flowing at Mach 1.3. The total pressure profiles of the supersonic jets were measured at several streamwise stations and the initial shear-layer growth rates were deduced from the measurements. The results showed that the special growth rate was significantly increased with the RAMP nozzle in comparison with axisymmetric supersonic jets discharging from reference circular nozzles. The increase was 44F/o at the convective Mach number of 0.23 and 110% at 0.86. Also, the supersonic jets were visualized using a planar Mie-scattering technique. Instantaneous images of the RAMP-expanded-jet showed large-scale well-organized structures that resembled axial vortices in the shear layers. The appearance of these structures was linked to the increase in the initial shear-layer growth rate. Lastly, for an afterburning fuel-rich supersonic jet, the RAMP nozzle changed the afterburning characteristics significantly, This suggests that the supersonic mixing is affected. RP YU, KH (reprint author), USN,CTR AIR WARFARE,DIV RES & TECHNOL,CHINA LAKE,CA 93555, USA. NR 20 TC 9 Z9 9 U1 1 U2 2 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD NOV-DEC PY 1995 VL 11 IS 6 BP 1147 EP 1153 DI 10.2514/3.23953 PG 7 WC Engineering, Aerospace SC Engineering GA TF316 UT WOS:A1995TF31600008 ER PT J AU Jones, KD Sobieczky, H Seebass, AR Dougherty, FC AF Jones, KD Sobieczky, H Seebass, AR Dougherty, FC TI Waverider design for generalized shock geometries SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB A new method for the design of inviscid waverider configurations with more general shock geometries than previously possible is presented. An arbitrary three-dimensional shock shape is specified as input, and a new inverse method, utilizing a cross-stream marching scheme for solving the Euler equations, is used to generate the postshock flowfield. Unlike most previous studies, this approach allows for the use of nonaxisymmetric shock topologies with nonconstant shock strengths. The problem's ill-posedness is suppressed by reformulating the problem in the proper curvilinear coordinate system. The inverse marching approach is briefly summarized, and detail of the waverider design procedure are given. Comparisons of individual waveriders and their flowfields generated by the new algorithm in a few seconds on a workstation with flowfields computed by a direct Euler solver, requiring on the order of an hour of Cray 2 CPU time, demonstrate the accuracy and efficiency of the new approach. C1 DLR,GERMAN AEROSP RES ESTAB,W-3400 GOTTINGEN,GERMANY. UNIV COLORADO,BOULDER,CO 80309. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. RP Jones, KD (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 13 TC 6 Z9 13 U1 0 U2 2 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD NOV-DEC PY 1995 VL 32 IS 6 BP 957 EP 963 DI 10.2514/3.26715 PG 7 WC Engineering, Aerospace SC Engineering GA TK774 UT WOS:A1995TK77400005 ER PT J AU DeLaHunt, P Gates, S Levenson, M Creamer, G AF DeLaHunt, P Gates, S Levenson, M Creamer, G TI Clementine attitude determination and control system SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB The Clementine spacecraft, launched in January 1994, completed a two-month lunar mapping mission, recording high-resolution multispectral images of the lunar surface in unprecedented detail. Mission requirements on the attitude determination and control system included knowledge to within 0.03 deg and control to within 0.05 deg, The typical spacecraft attitude determination system, employing expensive narrow-field of-view star cameras, highly accurate inertial measurement units, and assorted coarse attitude acquisition sensors, was replaced by an all-new lightweight state-of-the-art sensor suite to meet low-cost, low-weight, and compressed schedule objectives. The sensor suite, which consisted of two wide-field-of-view star cameras and two inertial measurement units incorporating fiber-optic and ring-laser gyroscopes, was delivered in nine months rind provided a weight saving of 90% and a cost saving of 75% in comparison with similar systems. A newly developed lightweight reaction wheel, with a weight saving of 50% in comparison with heels of similar momentum storage capability was used for fine attitude control, The Clementine mission provided the first space flight for each of these components, Only two anomalies were experienced: a large drift in gyroscope bias along one axis, and a nondestructive single-event latchup in one inertial measurement unit. C1 SWALES & ASSOCIATES INC,BELTSVILLE,MD 20705. RP DeLaHunt, P (reprint author), USN,RES LAB,SPACECRAFT ATTITUDE CONTROL SECT,WASHINGTON,DC 20375, USA. NR 4 TC 1 Z9 2 U1 0 U2 4 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD NOV-DEC PY 1995 VL 32 IS 6 BP 1054 EP 1059 DI 10.2514/3.26730 PG 6 WC Engineering, Aerospace SC Engineering GA TK774 UT WOS:A1995TK77400021 ER PT J AU Baker, DN Kanekal, S Blake, JB Adams, JH AF Baker, DN Kanekal, S Blake, JB Adams, JH TI Charged-particle telescope experiment on Clementine SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB The charged-particle telescope (CPT) onboard the Clementine spacecraft measured the fluxes of energetic protons emitted in solar energetic particle events. Protons in the energy range from 10 to 80 MeV were of greatest interest for radiation effects such as total dose and single event upsets. Energetic electrons were also of interest for spacecraft charging and their contribution to total dose. The lower-energy CPT electron channels (25-500 keV) were mainly of geophysical interest. While orbiting the moon, the CPT observed the wake created by the moon when it blocked the flow of energetic particles in the magnetotail region. The CPT provided opportunities to observe energetic electron bursts during magnetic storms and magnetospheric substorms. CPT data are particularly useful in multispacecraft studies of interplanetary disturbances and their interaction with the magnetosphere. The proton channels on the CPT provided data on solar energetic protons and storm-time protons associated with the passage of an interplanetary shock at 0903 UT on Feb. 21, 1994. Results are compared with those from GOES-7, SAMPEX, and GEOTAIL. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. AEROSP CORP,LOS ANGELES,CA 90009. USN,RES LAB,DIV SPACE SCI,COSM RAY SECT,WASHINGTON,DC 20375. RP Baker, DN (reprint author), UNIV COLORADO,ATMOSPHER & SPACE PHYS LAB,CAMPUS BOX 590,BOULDER,CO 80309, USA. NR 10 TC 2 Z9 3 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD NOV-DEC PY 1995 VL 32 IS 6 BP 1060 EP 1064 DI 10.2514/3.26731 PG 5 WC Engineering, Aerospace SC Engineering GA TK774 UT WOS:A1995TK77400022 PM 11539374 ER PT J AU Garrett, HB Johnson, MS Ratliff, JM Johnston, A Anderson, S Stapor, WJ AF Garrett, HB Johnson, MS Ratliff, JM Johnston, A Anderson, S Stapor, WJ TI Single-event upset effects on the Clementine solid-state data recorder SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article ID ION TRACKS AB The sensitivity of the Clementine 2.1-Gbit solid-state data recorder (SSDR) to single-event upsets was characterized in ground tests. Subsequent in situ measurements of the ambient radiation environment by experiments onboard Clementine permitted evaluation of the ability of models of the single-event phenomenon in the SSDR to be tested using actual data. Initial results from the analysis reveal a nearly constant background upset rate of similar to 71 bit flips/day for the SSDR. There is no obvious correlation with a solar proton event recorded by Clementine and several other spacecraft on Feb. 20-21, 1994, indicating that the SSDR was not sensitive to protons. The constant rate is thus interpreted as being a function of the galactic cosmic-ray heavy-ion environment. A pronounced lunar orbit altitude dependence has also been identified in the data though the cause has not yet been unambiguously identified. C1 USN,RES LAB,WASHINGTON,DC 20375. CALTECH,JET PROP LAB,PASADENA,CA 91109. SEAKR ENGN INC,TORRANCE,CA 90503. EER,TECH STAFF,MONTROSE,CA 91020. RP Garrett, HB (reprint author), BALLIST MISSILE DEF ORG,WASHINGTON,DC 20301, USA. NR 9 TC 1 Z9 1 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD NOV-DEC PY 1995 VL 32 IS 6 BP 1071 EP 1076 DI 10.2514/3.26733 PG 6 WC Engineering, Aerospace SC Engineering GA TK774 UT WOS:A1995TK77400024 ER PT J AU HOUSTON, BH BUCARO, JA PHOTIADIS, DM AF HOUSTON, BH BUCARO, JA PHOTIADIS, DM TI BROAD-BAND ACOUSTIC SCATTERING FROM A RIBBED SHELL SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter ID WAVES AB Monostatic acoustic scattering measurements have been made on a large aspect ratio (L/D = 6.2) ribbed cylindrical shell over the frequency range 0.850% loss in the N(1s) x-ray photoelectron spectroscopy signal. A damage saturation level of 80% N(1s) loss was indicated at an ion fluence of 9 X10(15) ions/cm(2). A high-energy focused ion beam lithography system was also used to evaluate the high resolution patterning of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane, (aminoethylaminomethyl)phenethyltrimethoxysilane, and pyridine monolayers by Ga+, Si++, Au+ and Au++ ions at energies ranging from 50 to 280 keV. The highest resolution metal features obtained were 0.3-mu m-wide gaps on phenethyltrimethoxysilane and pyridine monolayers using Ga+ and Si++ ions. Aminopropyltrimethoxysilane monolayers were found to require ten times higher ion fluences to achieve comparable results with the phenethyltrimethoxysilane and pyridine monolayers for all ions investigated. (C) 1995 American Vacuum Society. C1 UNIV ILLINOIS, DEPT CHEM, CHICAGO, IL 60607 USA. MIT, ELECTR RES LAB, CAMBRIDGE, MA 02139 USA. USN, RES LAB, CTR BIOMOLEC SCI & ENGN, WASHINGTON, DC 20375 USA. NR 55 TC 75 Z9 75 U1 1 U2 7 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 NOV-DEC PY 1995 VL 13 IS 6 BP 2189 EP 2196 DI 10.1116/1.588102 PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA TN816 UT WOS:A1995TN81600009 ER PT J AU Ancona, MG AF Ancona, MG TI Thermomechanical analysis of failure of metal field emitters SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID EMISSION AB An analysis of the thermomechanics of metal (chiefly molybdenum) field emitters under normal operating conditions is given. The focus is on various ''intrinsic'' phenomena and the possibilities of triggering catastrophic breakdown. The heating is found to be predominantly Nottingham in origin (as opposed to ohmic) and is not appreciable unless the currents are well beyond the normal operating regime, e.g., as might occur under arcing conditions. As a result, the increases in temperature in operating tips are generally minimal unless the heat sinking to the substrate is weak, e.g., in ultrasharp tips, in tips on long, narrow posts, and/or in tips with severely degraded thermal conductivity. Apart from these exceptions, the small temperature excursions mean that no thermal runaway, melting, thermal desorption, or other direct thermal effects occur. Thermal stresses are of course also minimal; however, Maxwell stresses can be large under normal operating conditions, approaching the yield strength under high bias conditions. RP Ancona, MG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 16 Z9 17 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1995 VL 13 IS 6 BP 2206 EP 2214 DI 10.1116/1.588105 PG 9 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA TN816 UT WOS:A1995TN81600012 ER PT J AU Peckerar, MC Chang, S Marrian, CRK AF Peckerar, MC Chang, S Marrian, CRK TI Proximity correction algorithms and a co-processor based on regularized optimization .1. Description of the algorithm SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 39th International Conference on Electron, Ion, and Photon Beam Technology and Nanofabrication (EIPBN) CY MAY 30-JUN 02, 1995 CL SCOTTSDALE, AZ SP Amer Vacuum Soc, IEEE, Electron Device Soc, Opt Soc Amer ID ELECTRON-BEAM LITHOGRAPHY; MAXIMUM-ENTROPY SOLUTIONS; NEURAL NET ALGORITHM; ILL-POSED PROBLEMS AB This is the first of a series of articles aimed at laying the foundations for construction of special purpose computing machinery for solving the proximity effect problem. In this article, we compare three different types of proximity correction approach (basic matrix inversion, gradient descent optimization, and optimization using a Shannon entropy regularizer). We show that entropy regularization does not result in physically unrealizable negative dose requests as does the matrix inversion and related methods, and always provides optimizations closer to target than those derived from ''least-mean-square'' type gradient descent. The implications of this approach for integrated co-processor design are outlined. (C) 1995 American Vacuum Society. RP Peckerar, MC (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 22 TC 11 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1995 VL 13 IS 6 BP 2518 EP 2525 DI 10.1116/1.588385 PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA TN816 UT WOS:A1995TN81600070 ER PT J AU ZINDER, DJ POSTMA, GN AF ZINDER, DJ POSTMA, GN TI OUTPATIENT CAUTERY-ASSISTED UVULOPALATOPLASTY SO LARYNGOSCOPE LA English DT Note C1 USN,MED CTR,DEPT OTOLARYNGOL,PORTSMOUTH,VA. NR 4 TC 11 Z9 11 U1 0 U2 0 PU LARYNGOSCOPE CO PI ST LOUIS PA 10 S BROADWAY 14TH FLOOR, ST LOUIS, MO 63102-1741 SN 0023-852X J9 LARYNGOSCOPE JI Laryngoscope PD NOV PY 1995 VL 105 IS 11 BP 1256 EP 1257 DI 10.1288/00005537-199511000-00022 PG 2 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA TK190 UT WOS:A1995TK19000022 PM 7475886 ER PT J AU KINRA, VK KABACOFF, L WONG, C WUTTIG, M AF KINRA, VK KABACOFF, L WONG, C WUTTIG, M TI MECHANICS AND MECHANISMS OF MATERIAL DAMPING SYMPOSIUM - FOREWORD SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Editorial Material C1 OFF NAVAL RES,ARLINGTON,VA 22217. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. UNIV MARYLAND,COLLEGE PK,MD 20742. RP KINRA, VK (reprint author), TEXAS A&M UNIV,COLLEGE STN,TX 77843, USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD NOV PY 1995 VL 26 IS 11 BP 2772 EP 2772 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA564 UT WOS:A1995TA56400001 ER PT J AU GRAESSER, EJ AF GRAESSER, EJ TI EFFECT OF INTRINSIC DAMPING ON VIBRATION TRANSMISSIBILITY OF NICKEL-TITANIUM SHAPE-MEMORY ALLOY SPRINGS SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Symposium on Mechanics and Mechanisms of Material Damping, at the 1993 Materials Week Meeting of TMS/ASM CY 1993 CL PITTSBURGH, PA SP TMS, ASM AB A research study was undertaken to measure the transmissibility of nickel-titanium (Ni-Ti) shape memory alloy (SMA) springs and to compare the results to corresponding data on steel and INCONEL springs. It was motivated by interest in an effective metal alternative to rubber-based machinery isolation mounts, with possible active control features. Ni-Ti was used due to its well-known properties of shape memory and high intrinsic damping. Acceleration transmissibility was measured on a spring-mass system. Due to the distributed mass in the spring coils, standing waves occurred at high frequencies. However, due to the high intrinsic damping in Ni-Ti, the standing wave resonance peaks were as much as 20 dB lower than corresponding peaks in steel and INCONEL springs. Thus, the capability of Ni-Ti springs for high frequency acoustic isolation is significantly better than that of steel or INCONEL. Also, it is judged that the Ni-Ti material could be used in a variety of other isolation mount designs with a high likelihood for further improvement in passive isolation properties. In addition, it may be possible to use the shape memory effect (SME) in active control concepts. RP GRAESSER, EJ (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,MACHINERY STRUCT ACOUST BRANCH,ANNAPOLIS,MD 21402, USA. NR 11 TC 11 Z9 11 U1 1 U2 9 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD NOV PY 1995 VL 26 IS 11 BP 2791 EP 2796 DI 10.1007/BF02669637 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA564 UT WOS:A1995TA56400004 ER PT J AU HATHAWAY, KB CLARK, AE TETER, JP AF HATHAWAY, KB CLARK, AE TETER, JP TI MAGNETOMECHANICAL DAMPING IN GIANT MAGNETOSTRICTION ALLOYS SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Symposium on Mechanics and Mechanisms of Material Damping, at the 1993 Materials Week Meeting of TMS/ASM CY 1993 CL PITTSBURGH, PA SP TMS, ASM AB Magnetomechanical damping in the giant magnetostriction material Terfenol-D has been investigated by quasi-static stress-strain measurements and modeled theoretically. The damping capacity is a strong function of applied stress amplitude, increasing to a maximum at some finite stress and then decreasing slowly at still larger applied stresses. Maximum damping capacities greater than 1.0 were observed for the lowest magnetic bias fields and prestresses at applied stress amplitudes of 4 MPa. Both the qualitative behavior of the damping and its magnitude are successfully described by a model of abrupt magnetization jumps within individual domains driven by the applied stress. RP HATHAWAY, KB (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 11 TC 28 Z9 28 U1 1 U2 8 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD NOV PY 1995 VL 26 IS 11 BP 2797 EP 2801 DI 10.1007/BF02669638 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA564 UT WOS:A1995TA56400005 ER PT J AU LEE, GF AF LEE, GF TI RESONANCE APPARATUS FOR DAMPING MEASUREMENTS SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article; Proceedings Paper CT Symposium on Mechanics and Mechanisms of Material Damping, at the 1993 Materials Week Meeting of TMS/ASM CY 1993 CL PITTSBURGH, PA SP TMS, ASM AB The resonance apparatus was developed to characterize the damping properties of materials. The apparatus has been used extensively to determine Young's modulus and loss factor of polymers in the kHz frequency range over a temperature range of -60 degrees C to 70 degrees C. However, very little work has been done in using the apparatus to characterize metallic materials. To demonstrate the limits of the instrument, measurements were made on a high damping material, an epoxy polymer, and a low damping material, aluminum. The loss factor for the epoxy polymer is 2.4, which is the highest value measured in this apparatus. The loss factor for the aluminum is 0.003, which is the lowest value measured in this apparatus. Based on the aluminum results, the accuracy and precision were found to be 2 pct for Young's modulus. However, the accuracy and precision for loss factor were not as good as for the modulus. RP LEE, GF (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD NOV PY 1995 VL 26 IS 11 BP 2819 EP 2823 DI 10.1007/BF02669640 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA TA564 UT WOS:A1995TA56400007 ER PT J AU Oyofo, BA ElEtr, SH Wasfy, MO Peruski, L Kay, B Mansour, M Campbell, JR Svennerholm, AM Churilla, AM Murphy, JR AF Oyofo, BA ElEtr, SH Wasfy, MO Peruski, L Kay, B Mansour, M Campbell, JR Svennerholm, AM Churilla, AM Murphy, JR TI Colonization factors of enterotoxigenic E-coli (ETEC) from residents of Northern Egypt SO MICROBIOLOGICAL RESEARCH LA English DT Article DE CFA; ETEC; diarrhea ID TOXIGENIC ESCHERICHIA-COLI; FACTOR ANTIGEN-II; ENTERO-TOXIN PRODUCTION; MONOCLONAL-ANTIBODIES; DIARRHEA; CFA/II; E8775; SUBCOMPONENTS; CHILDREN; PLASMIDS AB Infection caused by enterotoxigenic Escherichia coli (ETEC) poses a serious health problem to children in developing countries. Colonization of the small intestinal mucosa by ETEC strains is mediated by antigenically specific fimbriae, also known as colonization factor antigens (CFA). The importance of this study arises from reports that active and passive immunization with ETEC strains harboring CFAs induced protective immunity against diarrhea in animal models with preformed antibodies. In humans, ETEC containing CFA/I, II, III and IV have been identified. The aim of this study was to define CFAs of ETEC isolated in Alexandria, Egypt. One hundred and seven ETEC isolates from 132 human residents in Alexandria, Egypt were isolated during a birth cohort study. ETEC isolates were screened for heat labile (LT) and heat stable (ST) toxins using a P-32 oligonucleotide hybridization probe and a GM1 ELISA. These isolates were examined using monoclonal antibodies against CPA/I, II, III, IV, and against the putative colonization antigens PCF0159 and PCF0166, CS 7 and CS 17. CFAs were found in 48% of ETEC strains. CFA/I was found in 18% of the strains, CFA/II in 10% and CFA/IV in 14%. CFA III was not found. All fifteen strains expressing CFA/IV expressed CS6 and produced ST. CFA/IV was not found in non-ST producing strains, while CFA/I was absent in ST - only producing strains. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. NR 33 TC 4 Z9 4 U1 0 U2 1 PU GUSTAV FISCHER VERLAG JENA PI JENA PA VILLENGANG 2, D-07745 JENA, GERMANY SN 0944-5013 J9 MICROBIOL RES JI Microbiol. Res. PD NOV PY 1995 VL 150 IS 4 BP 429 EP 436 PG 8 WC Microbiology SC Microbiology GA TN149 UT WOS:A1995TN14900011 PM 8564370 ER PT J AU OLLAYOS, CW SWOGGER, KA AF OLLAYOS, CW SWOGGER, KA TI ABNORMAL CERVICAL SMEARS IN THE MILITARY RECRUIT POPULATION SO MILITARY MEDICINE LA English DT Article AB Human papillomavirus is a common genital tract infection believed to be a causative agent of uterine cervical dysplasia, In a minority of cases, dysplasia progresses to squamous cell carcinoma, We reviewed the cervical smear reports for all female recruits who reported for training at Navy Recruit Training Center, Orlando, in calendar year 1993, During this period, 8,029 female recruits reported for training. We found that 24 recruits (0.30%) had a finding of high-grade squamous intraepithelial lesion (HSIL); 203 (2.5%) had a finding of low-grade squamous intraepithelial lesion (LSIL); 377 (4.7%) had abnormalities other than HSIL or LSIL; and 7,425 (92%) had no abnormalities, These prevalence rates are lower than those reported for other populations. C1 USN,HOSP ORLANDO,DEPT LAB MED,ORLANDO,FL 32813. NR 0 TC 5 Z9 5 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD NOV PY 1995 VL 160 IS 11 BP 577 EP 578 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA TE046 UT WOS:A1995TE04600010 PM 8538894 ER PT J AU JAMUR, MC MORENO, AN GRODZKI, ACG SIRAGANIAN, RP OLIVER, C AF JAMUR, MC MORENO, AN GRODZKI, ACG SIRAGANIAN, RP OLIVER, C TI IMMUNOMAGNETIC SEPARATION OF RAT PERITONEAL AND BONE-MARROW-DERIVED MAST-CELLS SO MOLECULAR BIOLOGY OF THE CELL LA English DT Meeting Abstract C1 FED UNIV PARANA,DEPT BIOL CELULAR,CURITIBA,PARANA,BRAZIL. NIDR,IMMUNOL LAB,BETHESDA,MD 20892. OFF NAVAL RES,ARLINGTON,VA 22217. RI Jamur, Maria Celia/L-5520-2016 OI Jamur, Maria Celia/0000-0001-7065-8543 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC CELL BIOL PI BETHESDA PA PUBL OFFICE 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 1059-1524 J9 MOL BIOL CELL JI Mol. Biol. Cell PD NOV PY 1995 VL 6 SU S BP 2600 EP 2600 PG 1 WC Cell Biology SC Cell Biology GA TF513 UT WOS:A1995TF51302597 ER PT J AU CHANG, CP CHEN, GTJ AF CHANG, CP CHEN, GTJ TI TROPICAL CIRCULATIONS ASSOCIATED WITH SOUTHWEST MONSOON ONSET AND WESTERLY SURGES OVER THE SOUTH CHINA SEA SO MONTHLY WEATHER REVIEW LA English DT Article AB The earliest onset of the Asian summer monsoon occurs in early to middle May over the South China Sea. This onset is signified by the development of low-level westerlies and leads to heavy convective rainfall over southern China (pre-Mei-Yu). In June, low-level westerly surges over the northern South China Sea are associated with the Mei-Yu rainfall system in the Yangtze region and southern Japan. In this work, the ECMWF data for 1981-86 are used to study the tropical circulations associated with the development of low-level westerlies during both events. Composites of horizontal wind, geopotential height, moisture, and vertical velocity during six May onsets and nine June surges, respectively, indicate that both events occur with the approach of a midlatitude trough-front system. The possible triggering of the South China Sea summer monsoon onset by the midlatitude system may explain why the South China Sea onset occurs prior to other regions of the Asian monsoon. During boreal spring, this is the only Asian monsoon region where midlatitude fronts can move into the Tropics without having to overcome significant terrain barriers. Following the two events, opposite teleconnection-like patterns develop in the Tropics in both hemispheres. During the May onsets, the arrival of the midlatitude trough/front appears to lead to a southwestward extension of a cyclogenesis zone into the equatorial Indian Ocean. Along this zone, cyclonic vortices develop over the Andaman Sea, the Bay of Bengal, and perhaps the southern equatorial Indian Ocean, and increased deep convection is indicated by the OLR composites. During the June surges, a pair of anticyclones develop straddling the equator at the longitudes of Indochina. This anticyclonic couplet is associated with decreased deep convection and propagates westward to dominate the flow changes over the Bay of Bengal and the southern Indian Ocean. The steady 4-5 m s(-1) westward speed and near-perfect symmetry with respect to the equator indicate the possibility of an equatorial Rossby wave generation in conjunction with the June westerly surges in the northern South China Sea. C1 NATL TAIWAN UNIV,DEPT ATMOSPHER SCI,TAIPEI 10764,TAIWAN. RP CHANG, CP (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MR CP,589 DYER RD,ROOM 254,MONTEREY,CA 93943, USA. NR 20 TC 71 Z9 109 U1 5 U2 10 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD NOV PY 1995 VL 123 IS 11 BP 3254 EP 3267 DI 10.1175/1520-0493(1995)123<3254:TCAWSM>2.0.CO;2 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA TB867 UT WOS:A1995TB86700009 ER PT J AU Marshall, B Egnak, S AF Marshall, B Egnak, S TI Optimizing performance and reliability of automated machinery control systems and instrumentation SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Control and measurement systems can comprise complex arrangements of electro-mechanical components which operate as sensor-to-readout chains. To achieve maximum automation capability of the host engineering systems, these instrumentation suites present challenges regarding alignment, calibration, and associated logistics. Accuracy of all components is also critical for use by knowledge-based condition assessment systems to form judgments regarding plant operation and maintenance. This paper presents a successful effort which supports these requirements. System calibration is the process that ensures that a measurement chain, consisting of inter-related components, is accurately monitoring an engineering parameter within a specified tolerance. This entails calibration of a measurement or control system as a unified entity, from endpoint to endpoint, having first performed any prerequisite alignments. This approach enhances system availability by reducing operational problems through preventive methods that ensure correct setting of control circuitry and alarms, as well as interchangeability of components and spares, and by providing troubleshooting techniques to solve certain emergent difficulties. System-level calibration concepts are described, in the form of an existing Navy program, along with a summary of benefits to Fleet operators and instrumentation support engineers. Lessons learned from this application, as they pertain to design and specification considerations, are also addressed. Examples of the relationship of calibration to today's and future technology are also given. RP Marshall, B (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,PHILADELPHIA,PA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD NOV PY 1995 VL 107 IS 6 BP 51 EP 63 PG 13 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA UG342 UT WOS:A1995UG34200007 ER PT J AU MELE, EJ KRISHNA, GV ERWIN, SC AF MELE, EJ KRISHNA, GV ERWIN, SC TI COMMENSURATE AND MODULATED MAGNETIC PHASES IN ORTHORHOMBIC AC(60) (A=K, RB) SO PHYSICAL REVIEW B LA English DT Note AB Competing magnetically ordered structures in polymerized orthorhombic AC(60) are studied. A mean-field theory for the equilibrium phases is developed using an Ising model and a classical Heisenberg model to describe the competition between interchain and intrachain magnetic order in the solid. In the Ising model, the limiting commensurate one-dimensional (1D) and three-dimensional phases are separated by a commensurate three-sublattice state and by two sectors containing higher-order commensurate modulated phases. For the Heisenberg model the quasi-one-dimensional phase is never the equilibrium state; instead the 3D commensurate phases exhibit a transition to a continuum of coplanar spiral magnetic phases. C1 UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104. USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP MELE, EJ (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. RI Erwin, Steven/B-1850-2009 NR 9 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1995 VL 52 IS 17 BP 12493 EP 12496 DI 10.1103/PhysRevB.52.12493 PG 4 WC Physics, Condensed Matter SC Physics GA TD724 UT WOS:A1995TD72400006 ER PT J AU SINGH, DJ AF SINGH, DJ TI STRUCTURE AND ENERGETICS OF ANTIFERROELECTRIC PBZRO3 SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON-DIFFRACTION; PHASE-TRANSITIONS; LEAD ZIRCONATE; FERROELECTRICITY; BATIO3; ORIGIN; KNBO3 AB Structural instabilities and electronic properties of PrZrO3 are investigated using local-density calculations. Substantial hybridization is found in the electronic band structure, both between O 2p and Zr 4d states and between O 2p and Pb s and p states. A very strong Gamma point phonon instability is present for the cubic perovskite structure. Relaxation, allowing only zone-center distortions, yields a large energy lowering of 0.253 eV, with bond-length changes in excess of 0.5 Angstrom. Two related R point instabilities are found, both of which involve changes in Pb-O distances. The more unstable of these involves a 12 degrees rotation of the O octahedra, with an energy lowering of 0.20 eV per formula unit. Total-energy calculations were performed for 40 atom unit cells with orthorhombic Pba2 and Pbam space groups as reported experimentally. Energies close to but still above the related Gamma structure were obtained with experimentally determined atomic positions. However, after relaxation of the oxygen coordinates, the antiferroelectric structure is favored by 0.02 eV per formula unit. This ordering and the small ferroelectric-antiferroelectric energy difference is in accord with the Pb(Zr,Ti)O-3 phase diagram. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 28 TC 98 Z9 99 U1 0 U2 24 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1995 VL 52 IS 17 BP 12559 EP 12563 DI 10.1103/PhysRevB.52.12559 PG 5 WC Physics, Condensed Matter SC Physics GA TD724 UT WOS:A1995TD72400024 ER PT J AU COHN, JL LOWEMA, CK VANDERAH, TA AF COHN, JL LOWEMA, CK VANDERAH, TA TI ANOMALOUS PHONON DAMPING AND THERMAL-CONDUCTIVITY IN INSULATING CUPRATES SO PHYSICAL REVIEW B LA English DT Note ID INELASTIC NEUTRON-SCATTERING; HIGH-TC SUPERCONDUCTIVITY; SINGLE-CRYSTALS; CERAMIC SUPERCONDUCTORS; ULTRASONIC MEASUREMENTS; PHASE-TRANSITIONS; LOW-TEMPERATURE; MAGNETIC ORDER; YBA2CU3O7-DELTA; OXYGEN AB We examine the in-plane thermal conductivity (K-ab) for different classes of insulating cuprate crystals, and present measurements for YBa2Cu3O6+x and PTBa2CU3O6+x (x less than or equal to 0.11). An unusual, nonmonotonic temperature (T) dependence of K-ab, previously observed in La2CuO4+delta, is demonstrated to be a characteristic of the 123 compounds as well. This feature signals the onset of anomalous damping for in-plane, heat-carrying phonons at T less than or equal to 250 K that is highly sensitive to light oxygen doping in YBa2Cu3O6+x. Its absence in Nd-2 CuO4+delta and similarity to the behavior of SrTiO3 suggests that the phenomenon in the cuprates is connected with tilt distortions of the CuO polyhedra. We discuss the implications of these results for interpretations of the superconducting-state enhancement of K-ab, widely observed in superconducting compounds. C1 USN,CTR WEAP,DIV CHEM,CHINA LAKE,CA 93555. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP COHN, JL (reprint author), UNIV MIAMI,DEPT PHYS,CORAL GABLES,FL 33124, USA. NR 64 TC 21 Z9 21 U1 2 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1995 VL 52 IS 18 BP 13134 EP 13137 PG 4 WC Physics, Condensed Matter SC Physics GA TD725 UT WOS:A1995TD72500017 ER PT J AU VANHOY, JR ANTHONY, JM HAAS, BM BENEDICT, BH MEEHAN, BT HICKS, SF DAVOREN, CM LUNDSTEDT, CL AF VANHOY, JR ANTHONY, JM HAAS, BM BENEDICT, BH MEEHAN, BT HICKS, SF DAVOREN, CM LUNDSTEDT, CL TI STRUCTURAL CHARACTERISTICS OF CE-142 THROUGH INELASTIC NEUTRON-SCATTERING SO PHYSICAL REVIEW C LA English DT Article ID INTERACTING-BOSON MODEL; MIXED-SYMMETRY STATES; LOW-LYING STATES; ND-144; TRANSITIONS; EXCITATION; INTERPLAY; OCTUPOLE; NUCLEI; BA-140 AB The excited levels of Ce-142 have been Studied using the (n,n'gamma) reaction. Excitation functions, angular distributions, and Doppler shifts were measured for gamma rays from levels up to an excitation energy of 3.3 MeV; multipole-mixing and branching ratios and transition rates were deduced. Theoretical predictions of electromagnetic transition rates were compared for the interacting boson model, the quasiparticle phonon model, and the particle-core coupling model with experimental values. Evidence is found supporting the fragmentation of mixed-symmetry strength among neighboring Ce-142 excited levels. This fragmentation is evinced in the 2(+) excitations through strong M1 transitions; however, the 3(+) mixed-symmetry strength is not manifested directly through strong M1 transitions, but rather is implied through model calculations. Candidates for multiphonon excitations are identified for the three-quadrupole and quadrupole-octupole phonon quintets. C1 UNIV DALLAS,DEPT PHYS,IRVING,TX 75062. RP VANHOY, JR (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 32 TC 47 Z9 47 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD NOV PY 1995 VL 52 IS 5 BP 2387 EP 2400 DI 10.1103/PhysRevC.52.2387 PG 14 WC Physics, Nuclear SC Physics GA TF576 UT WOS:A1995TF57600023 ER PT J AU RIDE, SK ESAREY, E BAINE, M AF RIDE, SK ESAREY, E BAINE, M TI THOMSON SCATTERING OF INTENSE LASERS FROM ELECTRON-BEAMS AT ARBITRARY INTERACTION ANGLES SO PHYSICAL REVIEW E LA English DT Article ID PARALLEL VELOCITY SPREAD; HARD X-RAYS; SYNCHROTRON-RADIATION; PLASMAS; GENERATION; PULSES; LIGHT AB Analysis of nonlinear Thomson scattering of intense lasers from relativistic electron beams is extended to describe off-axis scattering geometries. Electron trajectories are calculated for the case of a plane electromagnetic wave of arbitrary intensity, either circularly or linearly polarized, interacting with a relativistic electron beam at an arbitrary interaction angle. The trajectories are used to derive analytic expressions for the intensity distribution of the scattered radiation. These expressions are valid in the nonlinear regime (arbitrary laser intensity) and include the generation of harmonics. The effect of interaction angle on the intensity distribution is discussed and spectra are plotted numerically for the specific cases of head-on and transverse scattering. The-dependence of x-ray frequency, pulse duration, and photon flux on interaction geometry are also examined. Applications to the laser synchrotron source are discussed. There are potential advantages of both head-on and transverse interaction geometries: headon scattering results in the generation of higher frequencies and higher photon fluxes; normal incidence scattering can result in ultrashort x-ray pulses. C1 UNIV CALIF SAN DIEGO, CALIF SPACE INST, LA JOLLA, CA 92093 USA. USN, RES LAB, DIV PLASMA PHYS, BEAM PHYS BRANCH, WASHINGTON, DC 20375 USA. RP UNIV CALIF SAN DIEGO, DEPT PHYS, LA JOLLA, CA 92093 USA. NR 53 TC 97 Z9 102 U1 1 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1995 VL 52 IS 5 BP 5425 EP 5442 DI 10.1103/PhysRevE.52.5425 PN B PG 18 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TG337 UT WOS:A1995TG33700039 ER PT J AU ESAREY, E SPRANGLE, P KRALL, J AF ESAREY, E SPRANGLE, P KRALL, J TI LASER ACCELERATION OF ELECTRONS IN VACUUM SO PHYSICAL REVIEW E LA English DT Article ID HIGH-ENERGY; PARTICLES; WAVES AB Several features of vacuum laser acceleration are reviewed, analyzed, and discussed, including electron acceleration by two crossed laser beams and acceleration by a higher-order Gaussian beam. In addition, the vacuum beat wave accelerator (VBWA) concept is proposed and analyzed. It is shown that acceleration by two crossed beams is correctly described by the Lawson-Woodward (LW) theorem, i.e., no net energy gain results for a relativistic electron interacting with the laser fields over an infinite interaction distance. Finite net energy gains can be obtained by placing optical components near the laser focus to limit the interaction region. The specific case of a higher-order Gaussian beam reflected by a mirror placed near focus is analyzed in detail. It is shown that the damage threshold of the mirror is severely limiting, i.e., substantial energy gains require very high electron injection energies. The VBWA, which uses two copropagating laser beams of different frequencies, relies on nonlinear ponderomotive forces, thus violating the assumptions of the LW theorem. Single-particle simulations confirm that substantial energy gains are possible and that optical components are not needed near the focal region. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 34 TC 236 Z9 236 U1 4 U2 28 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1995 VL 52 IS 5 BP 5443 EP 5453 DI 10.1103/PhysRevE.52.5443 PN B PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TG337 UT WOS:A1995TG33700040 ER PT J AU BULSARA, AR LOWEN, SB REES, CD AF BULSARA, AR LOWEN, SB REES, CD TI COHERENT STOCHASTIC RESONANCE IN THE PRESENCE OF A FIELD - REPLY SO PHYSICAL REVIEW E LA English DT Letter AB We demonstrate that for small deviations from the regimes of its validity, the method of images (MOI) yields results for the passage time statistics that agree very well with the results obtained via direct numerical simulations of the integrate-fire model. The Gitterman-Weiss (GW) [Moshe Gitterman and George H. Weiss, preceding Comment, Phys. Rev. E (to be published)] calculation, while undoubtedly correct, sheds no new light on this problem, since it is valid in the same parameter regime as the MOI. Moreover, the MOI allows one to accurately predict critical behavior observed in the first passage density function. C1 COLUMBIA UNIV,DEPT ELECT ENGN,NEW YORK,NY 10027. RP BULSARA, AR (reprint author), USN,CTR CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST & EVALUAT,CODE 573,SAN DIEGO,CA 92152, USA. NR 6 TC 4 Z9 4 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD NOV PY 1995 VL 52 IS 5 BP 5712 EP 5713 DI 10.1103/PhysRevE.52.5712 PN B PG 2 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TG337 UT WOS:A1995TG33700078 ER PT J AU FERNSLER, RF SLINKER, SP LAMPE, M HUBBARD, RF AF FERNSLER, RF SLINKER, SP LAMPE, M HUBBARD, RF TI CONTROLLING THE RESISTIVE HOSE INSTABILITY IN RELATIVISTIC ELECTRON-BEAMS SO PHYSICS OF PLASMAS LA English DT Article ID PROPAGATING BEAM; DENSITY CHANNEL; TRACKING AB The resistive hose instability has long been recognized as the major impediment to the propagation of intense, relativistic electrons beams in dense gas. However, hose is a convective instability, and therefore its growth is limited by the length of the beam pulse, the local growth fate, and the speed at which the instability convects through the pulse. The convective speed and the growth rate depend on the beam and plasma parameters, and these vary strongly from beam head to tail. In this paper, hose theory is reformulated to incorporate these variations, and the reformulated model is then used to compute the maximum hose growth possible in a given beam pulse. In air, the model predicts that hose grows by many orders of magnitude when the beam current is less than 10 kA or has a rise time more than a few nanoseconds long. But the growth is predicted to be less than a factor of 20 if the current is 50 kA or more, the rise time is subnanosecond, and the beam radius is properly tapered from head to tail. The model is supported by extensive numerical simulations and is in general agreement with available experimental data. Many of the issues discussed here may have application to other instabilities as well. (C) 1995 American Institute of Physics. RP FERNSLER, RF (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 31 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD NOV PY 1995 VL 2 IS 11 BP 4338 EP 4354 DI 10.1063/1.870989 PG 17 WC Physics, Fluids & Plasmas SC Physics GA TC179 UT WOS:A1995TC17900036 ER PT J AU IWAMOTO, NE AF IWAMOTO, NE TI COMPARISONS OF EXPERIMENTAL-DATA TO INDEXES OF ADHESION DERIVED FROM DIELECTRIC MODELS SO POLYMER ENGINEERING AND SCIENCE LA English DT Article ID ORGANIZED MOLECULAR ASSEMBLIES; OXIDIZED ALUMINUM SURFACE; ATOMIC-FORCE MICROSCOPE; NORMAL-ALKANOIC ACIDS; THIN METAL-FILMS; DYNAMICS AB A perspective of adhesion is offered using average property indices such as dielectric constant, dipole moment, and thermal conductivity. These indices have been derived by comparisons of dielectric theories of adhesion and cohesion with comparisons to experimental data found in the literature. For example, it was found that adhesion generally increases with increased dielectric constant, or with the inverse of the thermal conductivity, for metal substrates. It was also found that ranges in the experimental data found were primarily caused by changes in surface roughness, which meant that interaction densities were not predictable. C1 USN, CTR WEAP, RES DEPT, DIV CHEM, CHINA LAKE, CA 93555 USA. NR 49 TC 1 Z9 1 U1 0 U2 0 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0032-3888 EI 1548-2634 J9 POLYM ENG SCI JI Polym. Eng. Sci. PD NOV PY 1995 VL 35 IS 22 BP 1811 EP 1817 DI 10.1002/pen.760352211 PG 7 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA TG173 UT WOS:A1995TG17300010 ER PT J AU Patterson, TL Semple, SJ Temoshok, LR Atkinson, JH McCutchan, JA StraitsTroster, K Chandler, JL Grant, I Velin, RA Oldfield, EC Wallace, MR Malone, J Spector, SA Thal, L Heaton, RK Hesselink, J Jernigan, T Wiley, CA Olshen, R Abramson, I Butters, N Dupont, R Patterson, T Zisook, S Jeste, D Sieburg, H Weinrich, JD AF Patterson, TL Semple, SJ Temoshok, LR Atkinson, JH McCutchan, JA StraitsTroster, K Chandler, JL Grant, I Velin, RA Oldfield, EC Wallace, MR Malone, J Spector, SA Thal, L Heaton, RK Hesselink, J Jernigan, T Wiley, CA Olshen, R Abramson, I Butters, N Dupont, R Patterson, T Zisook, S Jeste, D Sieburg, H Weinrich, JD TI Stress and depressive symptoms prospectively predict immune change among HIV-seropositive men SO PSYCHIATRY-INTERPERSONAL AND BIOLOGICAL PROCESSES LA English DT Article ID HUMAN-IMMUNODEFICIENCY-VIRUS; LYMPHOCYTE SUBSETS; LIFE EVENTS; INFECTION; CD4; RELIABILITY AB LIFE stress, mood, and other psychosocial factors may help to explain variability in HIV (human immunodeficiency virus) disease progression, Attempts to support this notion empirically have produced mixed findings; several studies report a positive relationship between psychosocial factors and various indicators of disease progression or immune function (e.g., Evans et al. 1992; Goodkin et al, 1992), whereas others have failed to detect any association (e,g,, Ferry et al, 1992). C1 DEPT VET AFFAIRS MED CTR,SAN DIEGO,CA. HENRY M JACKSON FDN ADVANCEMENT MIL MED,ROCKVILLE,MD. MIL MED CONSORTIUM APPL RETROVIRAL RES,ROCKVILLE,MD. SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182. UNIV CALIF SAN DIEGO,JOINT DOCTORAL PROGRAM CLIN PSYCHOL,SAN DIEGO,CA 92103. USN HOSP,SAN DIEGO,CA 92134. NR 39 TC 33 Z9 33 U1 0 U2 3 PU GUILFORD PUBLICATIONS INC PI NEW YORK PA 72 SPRING STREET, NEW YORK, NY 10012 SN 0033-2747 J9 PSYCHIATRY JI Psychiatry-Interpers. Biol. Process. PD NOV PY 1995 VL 58 IS 4 BP 299 EP 312 PG 14 WC Psychiatry SC Psychiatry GA TM648 UT WOS:A1995TM64800001 PM 8746489 ER PT J AU STOUT, JC SALMON, DP BUTTERS, N TAYLOR, M PEAVY, G HEINDEL, WC DELIS, DC RYAN, L ATKINSON, JH CHANDLER, JL GRANT, I VELIN, RA OLDFIELD, EC WALLACE, MR MALONE, J MCCUTCHAN, JA SPECTOR, SA THAL, L HEATON, RK HESSELINK, J JERNIGAN, T WILEY, CA OLSHEN, R ABRAMSON, I DUPONT, R PATTERSON, T ZISOOK, S JESTE, D SIEBERG, H WEINRICH, JD AF STOUT, JC SALMON, DP BUTTERS, N TAYLOR, M PEAVY, G HEINDEL, WC DELIS, DC RYAN, L ATKINSON, JH CHANDLER, JL GRANT, I VELIN, RA OLDFIELD, EC WALLACE, MR MALONE, J MCCUTCHAN, JA SPECTOR, SA THAL, L HEATON, RK HESSELINK, J JERNIGAN, T WILEY, CA OLSHEN, R ABRAMSON, I DUPONT, R PATTERSON, T ZISOOK, S JESTE, D SIEBERG, H WEINRICH, JD TI DECLINE IN WORKING-MEMORY ASSOCIATED WITH HIV-INFECTION SO PSYCHOLOGICAL MEDICINE LA English DT Article ID HUMAN-IMMUNODEFICIENCY-VIRUS; INDIVIDUAL-DIFFERENCES; PERFORMANCE AB HIV infection has been associated with decline in a number of cognitive functions that are components of 'working memory'. Thus, tests of working memory that require the interaction of these components may be particularly sensitive to cognitive dysfunction that arises from HIV infection. To assess this possibility, working memory was examined in 147 HIV-seropositive (HIV+) and 38 HIV-seronegative (HIV-) males using the Reading Span Test and the Digit Span subtest from the Wechsler Memory Scale-Revised (WMS-R). Speed of information processing, a component of some working memory tasks, was assessed with a version of the Sternberg Memory Scanning task. Results indicated that symptomatic HIV+ subjects were impaired relative to HIV- control subjects on the Reading Span and Digit Span tests. Asymptomatic and mildly symptomatic HIV+ groups exhibited a trend toward impairment on these tests, and on the whole, a greater proportion of HIV+ subjects than HIV- subjects were impaired. The groups did not differ significantly in information processing speed. These results indicate that deficits in working memory are apparent in at least a subset of HIV-infected individuals. These deficits are most apparent in symptomatic HIV+ individuals, but the decline may begin during the asymptomatic phase of infection. C1 UNIV CALIF SAN DIEGO,SAN DIEGO VET AFFAIRS MED CTR,DEPT PSYCHIAT,SAN DIEGO,CA 92103. UNIV CALIF SAN DIEGO,SAN DIEGO VET AFFAIRS MED CTR,DEPT NEUROSCI,SAN DIEGO,CA 92103. SAN DIEGO STATE UNIV,DEPT PSYCHOL,SAN DIEGO,CA 92182. USN,MED CTR,SAN DIEGO,CA 92152. BROWN UNIV,DEPT PSYCHOL,PROVIDENCE,RI 02912. FU NIMH NIH HHS [5 P50 MH45294, 5 RO1 MH43298] NR 29 TC 49 Z9 52 U1 0 U2 4 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0033-2917 J9 PSYCHOL MED JI Psychol. Med. PD NOV PY 1995 VL 25 IS 6 BP 1221 EP 1232 PG 12 WC Psychology, Clinical; Psychiatry; Psychology SC Psychology; Psychiatry GA TJ446 UT WOS:A1995TJ44600012 PM 8637952 ER PT J AU Kostoff, RN AF Kostoff, RN TI Research requirements for research impact assessment SO RESEARCH POLICY LA English DT Article AB This paper describes research required to advance the state of research impact assessment. Generic research requirements, such as certification, quality, motivation, and review frequency are discussed initially. Then, research requirements for retrospective methods (such as projects Hindsight and TRACES), qualitative methods (such as peer review), and quantitative methods (such as cost-benefit analysis and bibliometrics) are described. RP OFF NAVAL RES, 800 N QUINCY ST, ARLINGTON, VA 22217 USA. NR 68 TC 11 Z9 11 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0048-7333 EI 1873-7625 J9 RES POLICY JI Res. Policy PD NOV PY 1995 VL 24 IS 6 BP 869 EP 882 DI 10.1016/0048-7333(94)00798-5 PG 14 WC Management; Planning & Development SC Business & Economics; Public Administration GA TL494 UT WOS:A1995TL49400003 ER PT J AU Mott, PH Roland, CM AF Mott, PH Roland, CM TI Uniaxial deformation of rubber cylinders SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article AB Stress, strain and optical birefringence measurements were made on elastomeric cylinders deformed in tension and compression. The birefringence data enables the actual stress to be determined even when the deformation is not homogeneous. In the absence of lubricant, uniaxially loaded rubber cylinders deviate from homogeneous deformation due to bonding of the cylinder ends. The existing analysis to correct the force-deflection curve for the effect of this sticking, strictly valid for infinitesimal strains, is premised on the idea that the deformed cylinder has a parabolic profile. Experimentally, however, it was found that slender rubber cylinders assume a much flatter profile, while maintaining constant volume, when deformed. Nevertheless, the accuracy of the stress-strain curve when the standard correction is applied turns out to be quite good, partially a result of cancellation of two, relatively small, errors. This accuracy was assessed by comparison of force-deflection data from bonded cylinders both to stress-strain data obtained on lubricated cylinders and to the stresses deduced from the measured birefringence. RP Mott, PH (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 13 TC 19 Z9 19 U1 0 U2 3 PU AMER CHEMICAL SOC INC PI AKRON PA RUBBER DIV UNIV AKRON PO BOX 499, AKRON, OH 44309-0499 SN 0035-9475 J9 RUBBER CHEM TECHNOL JI Rubber Chem. Technol. PD NOV-DEC PY 1995 VL 68 IS 5 BP 739 EP 745 DI 10.5254/1.3538770 PG 7 WC Polymer Science SC Polymer Science GA TU411 UT WOS:A1995TU41100004 ER PT J AU BOURGEOIS, B HARRIS, M AF BOURGEOIS, B HARRIS, M TI THE US-NAVY FIRST-GENERATION ORCA SO SEA TECHNOLOGY LA English DT Article RP BOURGEOIS, B (reprint author), USN,RES LAB,BAY ST LOUIS,MS, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COMPASS PUBL INC PI ARLINGTON PA SUITE 1000 1117 N 19 ST, ARLINGTON, VA 22209 SN 0093-3651 J9 SEA TECHNOL JI Sea Technol. PD NOV PY 1995 VL 36 IS 11 BP 25 EP & PG 0 WC Engineering, Ocean SC Engineering GA TF077 UT WOS:A1995TF07700004 ER PT J AU MCCLINCY, MS VANDENBERG, HL KISER, WR AF MCCLINCY, MS VANDENBERG, HL KISER, WR TI D-DIMER TEST FOR HELLP-SYNDROME SO SOUTHERN MEDICAL JOURNAL LA English DT Letter RP MCCLINCY, MS (reprint author), USN HOSP,2080 CHILD ST,JACKSONVILLE,FL 32214, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU SOUTHERN MEDICAL ASSN PI BIRMINGHAM PA 35 LAKESHORE DR PO BOX 190088, BIRMINGHAM, AL 35219 SN 0038-4348 J9 SOUTHERN MED J JI South.Med.J. PD NOV PY 1995 VL 88 IS 11 BP 1182 EP 1183 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA TC642 UT WOS:A1995TC64200028 PM 7482002 ER PT J AU SOYER, AD MCCONNELL, JR AF SOYER, AD MCCONNELL, JR TI PROGRESSIVE SCOLIOSIS IN DUBOWITZ SYNDROME SO SPINE LA English DT Note AB Study Design. This case report describes a 17-year-old male with Dubowitz syndrome in whom a progressive left thoracic scoliosis developed that required surgical correction. Objective. Scoliosis associated with Dobowitz syndrome had not been previously described among the orthopedic manifestations of this rare syndrome. A review of the literature and the surgical treatment of this patient is presented. Summary of Background Data. Dubowitz syndrome is a rare autosomal recessive disorder characterized by microcephaly, craniofacial abnormalities, eczematous skin rash, delayed skeletal maturation, and shortness of stature. The orthopedic manifestations of this condition primarily involve the hands and feet with brachyclinodactyly of the fifth finger and syndactyly of the second and third toes. Spinal deformity in these individuals is not well described in the literature. Methods. Over a 2-year period, the patient's scoliosis progressed to 88 degrees, resulting in severe truncal imbalance without neurologic sequelae. A posterior spinal fusion with segmental instrumentation alone was used to correct the deformity. Results. After surgery, excellent restoration of spine sagittal and coronal plane alignment was achieved, resulting in improved sitting and standing balance. Conclusion. Patients with Dubowitz syndrome may be at risk of having a progressive, rigid scoliosis. These individuals may need to be observed over a prolonged period for the development of spinal deformity because of the potential of extended delay in skeletal maturation. C1 USN,MED CTR,DEPT ORTHOPAED SURG,SPINE SURG SERV,PORTSMOUTH,VA 23708. NR 0 TC 8 Z9 8 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQUARE, PHILADELPHIA, PA 19106 SN 0362-2436 J9 SPINE JI SPINE PD NOV 1 PY 1995 VL 20 IS 21 BP 2335 EP 2337 DI 10.1097/00007632-199511000-00012 PG 3 WC Clinical Neurology; Orthopedics SC Neurosciences & Neurology; Orthopedics GA TC594 UT WOS:A1995TC59400012 PM 8553122 ER PT J AU Qadri, SB Horwitz, JS Chrisey, DB Auyeung, RCY Knauss, LA AF Qadri, SB Horwitz, JS Chrisey, DB Auyeung, RCY Knauss, LA TI X-ray characterization of epitaxial (Sr,Ba)TiO3 films grown by pulsed laser deposition SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 22nd International Conference on Metallurgical Coatings and Thin Films (ICMCTF 1995) CY APR 24-29, 1995 CL SAN DIEGO, CA SP Amer Vacuum Soc, Vacuum Met & Thin Films Div DE epitaxial (Sr,Ba)TiO3 films; X-ray characterization; pulsed laser deposition ID THIN-FILMS; EVAPORATION AB Epitaxial single crystal thin films of Sr1-xBaxTiO3 (x=0, 0.2 and 0.5) have been deposited on MgO (001), SrTiO3 (001) and LaAlO3 (012) substrates using pulsed laser deposition (PLD). The full width at half maximum (FWHM) of the X-ray rocking curves for the (002) reflection of the Sr1-xBaxTiO3 were exceptionally narrow for films deposited on SrTiO3 (140 s of arc) and LaAlO3 (72 s of are) despite a lattice mismatch +/-1% and 4% respectively. X-ray rocking curves for films deposited on MgO substrates were significantly broader (+/-2500 arcsec). The data show that PLD can be used to grow films of MBE quality. C1 SFA INC,LANDOVER,MD 20785. RP Qadri, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV PY 1995 VL 76 IS 1-3 BP 348 EP 351 DI 10.1016/0257-8972(95)02574-X PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA TM179 UT WOS:A1995TM17900054 ER PT J AU Bawden, MP Slaten, DD Malone, JD AF Bawden, MP Slaten, DD Malone, JD TI Falciparum malaria in a displaced Haitian population SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article DE malaria; Plasmodium falciparum; displaced persons; Haiti; Cuba ID REFUGEE; CAMPS; SUDAN AB Falciparum malaria was a major problem among diplaced Haitians in temporary camps at the US Naval Base, Guantanamo Bay, Cuba. From December 1991 to March 1992, 235 cases of unmixed falciparum malaria were diagnosed in the laboratory, giving a cumulative attack rate of 160 per 10000 camp residents. All cases were successfully treated with oral chloroquine. Children under 16 years of age, and especially females, were at substantially higher risk of infection (attack rate 491/10000 versus 278/10000 for males in the same age range). Malaria attack rates by place of birth in Haiti were calculated per 10000 people as Cayemite, 530; Baraderes, 375; Pestel, 285; Port Au Prince, 247; and La Gonave, 36. The time to onset of clinical malaria after embarking at the Naval Base ranged from one to 58 d. No malaria transmission was demonstrated in the migrant camp. A non-systematic survey showed a 1.7% prevalence (95% confidence interval +/- 1.9%) of falciparum malaria among asymptomatic residents. Health practitioners in areas that may receive Haitian migrants should plan to care for malaria and preventive medicine measures are indicated, as imported malaria could be transmitted in areas where competent vectors are indigenous. C1 UNIFORMED SERV UNIV HLTH SCI, BETHESDA, MD 20814 USA. USN, MED CLIN, LONG BEACH, CA USA. NATL NAVAL MED CTR, BETHESDA, MD USA. NR 20 TC 2 Z9 3 U1 0 U2 1 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD NOV-DEC PY 1995 VL 89 IS 6 BP 600 EP 603 DI 10.1016/0035-9203(95)90404-2 PG 4 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA TP678 UT WOS:A1995TP67800005 PM 8594667 ER PT J AU Silpapojakul, K Pradutkanchana, J Pradutkanchana, S Kelly, DJ AF Silpapojakul, K Pradutkanchana, J Pradutkanchana, S Kelly, DJ TI Rapid, simple serodiagnosis of murine typhus SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article DE typhus; Rickettsia typhi; serological diagnosis ID MICROIMMUNOFLUORESCENCE TEST; AGGLUTINATION; ANTIBODY AB The dot-blot enzyme-linked immunosorbent assay (dot-ELISA) was compared to latex agglutination (LA) and the Weil-Felix OX-19 test for the diagnosis of murine typhus using the indirect immunofluorescent antibody (IFA) test as the 'gold standard'. With a panel of 74 positive and 47 negative sera, the dot-ELISA was 98% specific and 74% sensitive at a cut-off value of the second dot. With acute sera, latex agglutination was 100% specific and 74% sensitive at a cut-off titre of greater than or equal to 1:64. Both tests were more sensitive than the OX-19 test, which was 98% specific and 56% sensitive at a titre of greater than or equal to 1:320. Both dot-ELISA and latex agglutination were comparable and the results were available within one hour of testing. The rapidity, ease in performance and minimal requirement for electrical instruments made these 2 tests suitable for the diagnosis of murine typhus in countries where sophisticated laboratory facilities are lacking. C1 PRINCE SONGKLA UNIV,FAC MED,DEPT PATHOL,SONGKHLA,THAILAND. PRINCE SONGKLA UNIV,FAC MED,DEPT PATHOL,SONGKHLA,THAILAND. USN,MED RES INST,RICKETTSIAL & VIRAL DIS PROGRAM,BETHESDA,MD. NR 20 TC 9 Z9 10 U1 0 U2 0 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD NOV-DEC PY 1995 VL 89 IS 6 BP 625 EP 628 DI 10.1016/0035-9203(95)90417-4 PG 4 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA TP678 UT WOS:A1995TP67800014 PM 8594676 ER PT J AU Perry, MD Harrison, JA AF Perry, Martin D. Harrison, Judith A. TI The effects of methane-debris molecules on the frictional properties of diamond SO TRIBOLOGY LETTERS LA English DT Article DE friction; wear; diamond; tribochemistry; debris AB Molecular dynamics simulations have been used to examine the friction between two surfaces placed in sliding contact. These simulations show that the presence of methane-debris molecules squeezed between two hydrogen-terminated diamond (111) surfaces significantly reduces the friction compared to the same two surfaces in the absence of debris. These findings are in agreement with macroscopic experiments that have examined the friction of diamond on diamond in the presence of debris. In addition, the friction coefficients are significantly lower compared to the same system with methyl groups chemisorbed to one of the diamond surfaces. C1 [Perry, Martin D.; Harrison, Judith A.] USN Acad, Dept Chem, Annapolis, MD 21402 USA. RP Harrison, JA (reprint author), USN Acad, Dept Chem, Annapolis, MD 21402 USA. FU US Office of Naval Research (ONR) [N00014-95-WR-20014] FX This work was supported by the US Office of Naval Research (ONR) under contract # N00014-95-WR-20014. The authors would also like to thank Donald W. Brenner, Susan B. Sinnott, Frederick H. Streitz, James J. C. Barrett, and Carter T. White for many helpful discussions. Some of the figures were generated with the program XMol (XMol, version 1.3.1, Minnesota Supercomputer Center, Inc., Minneapolis, MN, 1993). NR 45 TC 14 Z9 14 U1 0 U2 0 PU SPRINGER/PLENUM PUBLISHERS PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1023-8883 J9 TRIBOL LETT JI Tribol. Lett. PD NOV PY 1995 VL 1 IS 2-3 BP 109 EP 119 PG 11 WC Engineering, Chemical; Engineering, Mechanical SC Engineering GA V17RY UT WOS:000207955500002 ER PT J AU REUBEN, C GALUN, E COHEN, H TENNE, R KALISH, R MURAKI, Y HASHIMOTO, K FUJISHIMA, A BUTLER, JM LEVYCLEMENT, C AF REUBEN, C GALUN, E COHEN, H TENNE, R KALISH, R MURAKI, Y HASHIMOTO, K FUJISHIMA, A BUTLER, JM LEVYCLEMENT, C TI EFFICIENT REDUCTION OF NITRITE AND NITRATE TO AMMONIA USING THIN-FILM B-DOPED DIAMOND ELECTRODES SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article DE ELECTROREDUCTION; BORON DOPING; NITRITE; NITRATE; DIAMOND ELECTRODES ID ELECTROCATALYTIC REDUCTION; ELECTROREDUCTION; COMPLEXES; IONS; ACID AB Boron-doped diamond films were used as electrodes for the reduction of nitrate and nitrite ions to ammonia. Prior to the electrochemical investigation, some in-depth analysis of the diamond films, was undertaken using various techniques. It was found that the plasma-assisted chemical vapor deposition process is superior to the chemical deposition process in controlling the (boron) doping process. The analysis also indicates that some of the boron is occluded in the film along the channels (grain boundaries) between the diamond crystallites. The faradaic efficiency (FE) of reduction of the nitrite (nitrate) to ammonia was found to be greater than unity and could be partially accounted for by the dissolution of the Si substrate itself. Further experiments with free-standing diamond films showed a rather smaller FE; nevertheless it was still greater than unity. A submonolayer of bound nitrogen was found on the diamond surface after the electrolysis. The present results are attributed to a catalytic mechanism for the multi-electron process described here. C1 TECHNION ISRAEL INST TECHNOL,IL-32000 HAIFA,ISRAEL. UNIV TOKYO,BUNKYO KU,TOKYO 113,JAPAN. USN,RES LABS,WASHINGTON,DC 20375. CNRS,UPR 1332,F-92195 MEUDON,FRANCE. RP REUBEN, C (reprint author), WEIZMANN INST SCI,IL-76100 REHOVOT,ISRAEL. RI Butler, James/B-7965-2008; Fujishima, Akira/G-7701-2012; Hashimoto, Kazuhito/C-5011-2012 OI Butler, James/0000-0002-4794-7176; Hashimoto, Kazuhito/0000-0002-8384-8749 NR 22 TC 83 Z9 84 U1 3 U2 14 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD OCT 31 PY 1995 VL 396 IS 1-2 BP 233 EP 239 DI 10.1016/0022-0728(95)03961-F PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA TE607 UT WOS:A1995TE60700031 ER PT J AU FATEMI, M THOMPSON, PE TWIGG, ME AF FATEMI, M THOMPSON, PE TWIGG, ME TI THERMAL STRESS-INDUCED, HIGH-STRAIN FRAGMENTATION OF BURIED SIGE LAYERS GROWN ON SI SO APPLIED PHYSICS LETTERS LA English DT Article ID HETEROSTRUCTURES AB Buried Si1-xGex layers grown on Si at elevated temperatures of 700 to 800 degrees C generally exhibit x-ray rocking curves which are significantly broader than those predicted for perfect crystals, suggesting that the layers are strain-relieved. However, calculations using these rocking curves show the materials to be either nearly- or fully-strained. The source of x-ray broadening accompanied by high strain is found to be an abrupt, thermally-induced fragmentation of the layer into small, slightly misoriented regions during the cool-down, such that the as-grown strain remains unchanged. The fragments are typically rectangles a few micrometers wide, with well-defined boundaries along [110]-type directions. RP FATEMI, M (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 11 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 30 PY 1995 VL 67 IS 18 BP 2678 EP 2680 DI 10.1063/1.114290 PG 3 WC Physics, Applied SC Physics GA TB959 UT WOS:A1995TB95900032 ER PT J AU KRUPPA, W BINARI, SC DOVERSPIKE, K AF KRUPPA, W BINARI, SC DOVERSPIKE, K TI LOW-FREQUENCY DISPERSION CHARACTERISTICS OF GAN HFETS SO ELECTRONICS LETTERS LA English DT Article DE ELECTRON TRAPS; FIELD EFFECT TRANSISTORS; GALLIUM NITRIDE AB The low-frequency transconductance and output resistance of AlN/GaN HFETs have been examined as functions of temperature. Dispersive characteristics were found which are indicative of trapping activity in the GaN channel layer. Traps with an activation energy near 1 eV were evident. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRUPPA, W (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 5 TC 44 Z9 44 U1 0 U2 3 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD OCT 26 PY 1995 VL 31 IS 22 BP 1951 EP 1952 DI 10.1049/el:19951298 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA TE339 UT WOS:A1995TE33900048 ER PT J AU ROBERTSON, DH BRENNER, DW WHITE, CT AF ROBERTSON, DH BRENNER, DW WHITE, CT TI TEMPERATURE-DEPENDENT FUSION OF COLLIDING C-60 FULLERENES FROM MOLECULAR-DYNAMICS SIMULATIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID COLLISIONS; SURFACE; SCATTERING AB Although both experimental and modeling studies have found that C-60 is highly resistant to reactions during hypervelocity surface impacts, recent experiments have shown that at sufficient collision energies C-60 fullerenes can fuse. Stimulated by these results, we have performed extensive molecular dynamics simulations of C-60 collisions using a reactive empirical bond-order (REBO) potential. In this letter we investigate the behavior of colliding C-60 molecules over the temperature range 0-4000 K and collision energies of 10-140 eV. We find that at sufficient collision energies and/or temperatures these molecules can fuse, consistent with experimental evidence. Moreover, we fmd that increasing the initial C-60 temperature from 0 to 4000 K can dramatically decrease the collision energy necessary for observing C-60 fullerene fusion from 90 to near 0 eV. C1 USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. RP ROBERTSON, DH (reprint author), INDIANA UNIV PURDUE UNIV,DEPT CHEM,402 N BLACKFORD ST,INDIANAPOLIS,IN 46202, USA. RI Brenner, Donald/D-1741-2009 NR 16 TC 25 Z9 26 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 26 PY 1995 VL 99 IS 43 BP 15721 EP 15724 DI 10.1021/j100043a006 PG 4 WC Chemistry, Physical SC Chemistry GA TD476 UT WOS:A1995TD47600006 ER PT J AU BUNDENS, WP BERGAN, JJ HALASZ, NA MURRAY, J DREHOBL, M AF BUNDENS, WP BERGAN, JJ HALASZ, NA MURRAY, J DREHOBL, M TI THE SUPERFICIAL FEMORAL VEIN - A POTENTIALLY LETHAL MISNOMER SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Note ID THROMBOSIS; ULTRASOUND; DIAGNOSIS AB Objective.-To assess the potential for error in interpretation of venous duplex reports that use the term ''superficial femoral vein.'' Design.-Three surveys conducted by mail. Setting-Three multispecialty medical groups, anatomy departments of all US medical schools, and vascular laboratories. Participants.-A total of 46 family practitioners and general internists, 95 chairpersons of departments of anatomy, and 85 laboratory directors. Main Outcome Measures.-Proposed treatment of a patient with leg pain and an acute thrombosis of the superficial femoral vein; what nomenclature(s) for the deep thigh veins is (are) felt to be correct, what are acceptable alternatives, what is taught to students and which is preferred; and what terminology is being used in lower limb venous duplex reports. Results.-Only 24% (11/46) of the respondents would have administered anticoagulants to the patient as described. Only 3% (3/95) of anatomists felt the term ''superficial femoral vein'' was correct, 22% (21/95) felt it was an acceptable alternative (though only 9% [9/95] taught it to medical students), and only 7% (7/95) of anatomists felt the term was preferred for everyday use, The term ''superficial femoral vein'' is used by 93% (79/85) of vascular laboratories in lower limb venous duplex reports. Conclusion.-Although the overwhelming majority of vascular laboratories use the term ''superficial femoral vein'' in venous duplex reports, the use of this term is potentially hazardous to patients. Most primary care physicians have not been taught and are not aware that the superficial femoral vein is a deep vein and that acute thrombosis of this vessel is potentially life threatening. C1 USN,MED CTR,SAN DIEGO,CA 92152. USN,CTR HLTH CARE,SAN DIEGO,CA 92152. RP BUNDENS, WP (reprint author), UNIV CALIF SAN DIEGO,DEPT SURG,9500 GILMAN DR,0643,ROOM 147,LA JOLLA,CA 92093, USA. NR 14 TC 21 Z9 21 U1 1 U2 1 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD OCT 25 PY 1995 VL 274 IS 16 BP 1296 EP 1298 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA TA104 UT WOS:A1995TA10400025 PM 7563535 ER PT J AU GULIAN, AM VANVECHTEN, D AF GULIAN, AM VANVECHTEN, D TI NONEQUILIBRIUM DYNAMIC CONDUCTIVITY OF SUPERCONDUCTORS - AN EXPLOITABLE BASIS FOR HIGH-ENERGY RESOLUTION X-RAY-DETECTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID TUNNEL-JUNCTION AB A new design for high-energy radiation/particle detectors is presented. The nonequilibrium response of a superconductor to the absorption of the incident quanta is sensed by electromagnetic measurements of the altered dynamic conductivity. Microwave absorption may be used to amplify the signal. Such a detector will provide better energy resolution than semiconducting charge-collection devices once the statistical resolution limit is reached. (C) 1995 American Institute of Physics. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GULIAN, AM (reprint author), NATL ACAD SCI,INST PHYS RES,ASHTARAK 378410,ARMENIA. NR 31 TC 6 Z9 6 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 23 PY 1995 VL 67 IS 17 BP 2560 EP 2562 DI 10.1063/1.114432 PG 3 WC Physics, Applied SC Physics GA TA581 UT WOS:A1995TA58100045 ER PT J AU QI, J ANGERER, W YEGANEH, MS YODH, AG THEIS, WM AF QI, J ANGERER, W YEGANEH, MS YODH, AG THEIS, WM TI OBSERVATION OF MIDGAP INTERFACE STATES IN BURIED METAL GAAS JUNCTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID UNIFIED DEFECT MODEL; BAND-GAP STATES; 2ND-HARMONIC GENERATION; SCHOTTKY BARRIERS; SPECTROSCOPY; STOICHIOMETRY; HETEROEPITAXY; GAAS(110); SURFACES AB Second-order nonlinear optical spectroscopies reveal midgap interface states at buried metal/GaAs junctions, and demonstrate that these states are sensitive to interface preparation. In As-rich (Ga-rich) Au/GaAs n-type samples one (two) midgap resonance was observed. Similar resonances were exhibited in As/GaAs n-type samples, but were not present in metal/GaAs p-type systems. The sharp spectral features provide compelling evidence for the existence and symmetry of atomic displacement-induced defect states just below the buried interface. C1 USN,CTR AIR WARFARE,CHINA LAKE,CA 93555. RP QI, J (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. NR 21 TC 13 Z9 13 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 23 PY 1995 VL 75 IS 17 BP 3174 EP 3177 DI 10.1103/PhysRevLett.75.3174 PG 4 WC Physics, Multidisciplinary SC Physics GA TB161 UT WOS:A1995TB16100037 ER PT J AU JACKSON, EM WEAVER, BD SUMMERS, GP SHAPIRO, P BURKE, EA AF JACKSON, EM WEAVER, BD SUMMERS, GP SHAPIRO, P BURKE, EA TI RADIATION-INDUCED T-C REDUCTION AND PAIR-BREAKING IN HIGH-T-C SUPERCONDUCTORS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND BALTIMORE CTY,BALTIMORE,MD 21228. RP JACKSON, EM (reprint author), SFA INC,LANDOVER,MD 20875, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 23 PY 1995 VL 75 IS 17 BP 3199 EP 3199 DI 10.1103/PhysRevLett.75.3199 PG 1 WC Physics, Multidisciplinary SC Physics GA TB161 UT WOS:A1995TB16100047 ER PT J AU BLACKSTEAD, HA CHRISEY, DB DOW, JD HORWITZ, JS KLUNZINGER, AE PULLING, DB AF BLACKSTEAD, HA CHRISEY, DB DOW, JD HORWITZ, JS KLUNZINGER, AE PULLING, DB TI SUPERCONDUCTIVITY IN PRBA2CU3O7 SO PHYSICS LETTERS A LA English DT Article ID NORMAL-STATE PROPERTIES; Y1-XPRXBA2CU3O7; SUBSTITUTION; SYSTEMS; TC AB Inhomogeneous granular superconductivity has been observed in PrBa2Cu3O7 films probed by microwaves, and in powders studied by electron spin resonance - although both the films and the powders have insulating do resistivities. The transition temperatures are approximate to 90 K with 90%-10% transition widths of approximate to 20 K or less. We interpret this as meaning (i) that small regions of PrBa2Cu3O7 superconduct, (ii) that perfect PrBa2Cu3O7 superconducts in the vicinity of the Cu-O chains, (iii) that cuprate-plane models of superconductivity are invalid, and (iv) that Ba-site Pr ions break pairs and destroy superconductivity. C1 USN,RES LAB,WASHINGTON,DC 20375. ARIZONA STATE UNIV,DEPT PHYS,TEMPE,AZ 85287. RP BLACKSTEAD, HA (reprint author), UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556, USA. NR 20 TC 72 Z9 72 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD OCT 23 PY 1995 VL 207 IS 1-2 BP 109 EP 112 DI 10.1016/0375-9601(95)00653-K PG 4 WC Physics, Multidisciplinary SC Physics GA TB271 UT WOS:A1995TB27100018 ER PT J AU WILSON, TL GAUME, RA JOHNSTON, KJ TIEFTRUNK, AR AF WILSON, TL GAUME, RA JOHNSTON, KJ TIEFTRUNK, AR TI DENSE GAS IN THE DR-21 REGION - HIGH-RESOLUTION IMAGING OF THE NH3 INVERSION LINES SO ASTROPHYSICAL JOURNAL LA English DT Article DE H II REGIONS; ISM, INDIVIDUAL (DR 21); ISM, KINEMATICS AND DYNAMICS; ISM, MOLECULES; RADIO LINES, ISM ID STAR-FORMING REGION; INTERNAL STRUCTURE; MOLECULAR OUTFLOW; VLA OBSERVATIONS; DR-21; AMMONIA; ABSORPTION; DR21; CONDENSATIONS; EMISSION AB Three arcsecond angular resolution images of the (J, K) = (1, 1) and (3, 3) inversion lines of NH3 toward the DR 21 H II region are presented. There is absorption in the (1, 1) line toward DR 21 and emission to the northwest, northeast, southwest, and south. The NH3 region found in emission in the (1, 1) line southwest of DR 21 is likely the same cloud seen in absorption toward the H II region. If the emission and absorption regions are taken as one cloud, this is the most massive and largest near DR 21. In the (J, K) = (1, 1) line this cloud shows a velocity gradient of 15 km s(-1) pc(-1). To the northeast, low-brightness continuum emission extends over a larger region, and there is little NH3. In the (1, 1) emission line, filament-like NH3 emission regions are elongated N-S > 20 ''; for most, the emission is almost unresolved in the E-W direction. In most cases these filaments have a position angle that is very close to that measured for the molecular cloud over > 10'. The NH3 emission line delineates the location of the denser molecular gas. The presence of dense clouds south and southwest of the continuum source and the sharp falloff of the H II continuum intensity to the southwest gives support to the notion that the expansion of the H II region is halted by dense neutral gas to the southwest. The structures traced by the (3, 3) transition differ greatly from those found for the (1, 1) line. Toward the H II region DR 21, there are several (3, 3) emission maxima, two of which exhibit prominent negative velocity line wings. The (3, 3) line traces the hotter shocked gas. Given the negative velocity wings, the morphology of the (3, 3) line emission and the location of the NH3 emission relative to the powerful outflow seen in vibrationally excited H-2 and other molecules, we conclude that the NH3 represents the remnant material that has survived the powerful outflow. We estimate the location of the outflow source assuming that this is located near the shocked gas midway between the two NH3 (3,3) maxima with prominent negative velocity line wings. C1 USN OBSERV,WASHINGTON,DC 20392. USN,RES LAB,WASHINGTON,DC 20375. RP WILSON, TL (reprint author), MAX PLANCK INST RADIOASTRON,POSTFACH 2024,D-53010 BONN,GERMANY. NR 27 TC 8 Z9 8 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1995 VL 452 IS 2 BP 693 EP 703 DI 10.1086/176341 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RY932 UT WOS:A1995RY93200021 ER PT J AU SHARE, GH MURPHY, RJ AF SHARE, GH MURPHY, RJ TI GAMMA-RAY MEASUREMENTS OF FLARE-TO-FLARE VARIATIONS IN AMBIENT SOLAR ABUNDANCES SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ABUNDANCES; SUN, FLARES; SUN, PARTICLE EMISSION; SUN, X-RAYS, GAMMA RAYS ID ELEMENTAL ABUNDANCES; ENERGETIC PARTICLES; ACTIVE-REGION; NEON; OXYGEN AB We have measured fluxes of 10 narrow gamma-ray lines in 19 X-class solar flares observed by the Solar Maximum Mission spectrometer from 1980 to 1989. These lines originate from interaction of energetic protons and alpha-particles with ambient solar material. Flare-to-flare variations in line fluxes reveal that the abundances of elements in the flare plasma are grouped with respect to their first ionization potentials (FIPs). Line fluxes from elements with similar FIPs correlate well with one another; in contrast, the low-FIP (<10 eV; e.g., Mg, Si, and Fe) to high-FIP (>11 eV; e.g., C, N, and O) line ratios vary by as much as about a factor of 4 from flare to flare. This factor of 4 is consistent with the enhancement of low-FIP elements found in the solar corona relative to photospheric abundances. We also find that the Ne/O line ratio increases as the accelerated particle spectrum becomes softer. This can be explained by excitation cross sections less than 10 MeV, but the magnitude of the effect is dependent on the accelerated alpha-particle/proton ratio. After correcting for this spectral dependence, we find that the Ne/(C+N+O) line ratio is constant from flare-to-flare, indicating that Ne behaves like these other high-FIP elements in the ambient flare plasma. We discuss a possible explanation, which is based on these observations, for the factor of similar to 3 enhancement in the abundance of Ne relative to other high-FIP elements in the 1981 April 27 flare found by Murphy et al. (1998). RP SHARE, GH (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7650,WASHINGTON,DC 20375, USA. NR 28 TC 109 Z9 110 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1995 VL 452 IS 2 BP 933 EP 943 DI 10.1086/176360 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RY932 UT WOS:A1995RY93200040 ER PT J AU SONI, RN BIST, HD RAGHUVANSHI, GS NARAYAN, J BROUSSARD, PR AF SONI, RN BIST, HD RAGHUVANSHI, GS NARAYAN, J BROUSSARD, PR TI LASER IRRADIATION EFFECTS IN YBA2CU3O7-DELTA THIN-FILMS ON METALLIC AND SINGLE-CRYSTAL SUBSTRATES, A MICRO-RAMAN STUDY SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID SUPERCONDUCTING PROPERTIES; TRANSPORT-PROPERTIES; ACTIVE PHONONS; SCATTERING; TIN; Y1BA2CU3O7-DELTA; SPECTROSCOPY; DEPOSITION; DEPENDENCE AB In-depth micro-Raman study of YBa2Cu3O7-delta a thin films deposited on metallic substrates (hastelloy-C, inconel-600 and stainless steel-304) with a TiN buffer layer (YBCO-M) and single crystal LaAlO3 (YBCO-L) substrate has been carried out in order to investigate the relative phenomenological differences between the behavior of these films on different substrates, A comparative study of films on these substrates revealed that the bandwidths of the prominent oxygen vibrations in YBCO-M are significantly larger than those in the case of YBCO-L and a defect induced, strong and broad feature around 570 cm(-1) is always present in the Raman spectra of YBCO-M, The broadening of bands and the presence of the 570 cm(-1) band have been attributed to the disorder induced by buffer layer in YBCO-M, Variation of the incident laser power (P-L) from 1 to 10 mW, or a continuous irradiation were found to induce unusual, irreversible but, dissimilar changes in the Raman spectra of YBCO-M and YBCO-L, A significant change in the intensity distribution of oxygen vibrations and a decrease in the bandwidth of the out-of-phase mode in YBCO-M films have been attributed to an improvement in the crystallinity of YBCO-M films due to oxygen ordering in the CuO2 planes, Whereas, in YBCO-L, the laser irradiation causes oxygen removal from the CuO chains and formation of impurity phase BaCu2(O). Distinct laser induced changes in the Raman spectra of YBCO-M and YBCO-L have been explained in terms of photoinduced ordering and local heating effects respectively. C1 INDIAN INST TECHNOL, DEPT PHYS, KANPUR 208016, UTTAR PRADESH, INDIA. INDIAN INST TECHNOL, CELT, KANPUR 208016, UTTAR PRADESH, INDIA. COLL ENGN, DEPT PHYS, KOTA 324009, INDIA. N CAROLINA STATE UNIV, DEPT MAT SCI & ENGN, RALEIGH, NC 27695 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RI Narayan, Jagdish/D-1874-2009 NR 42 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD OCT 20 PY 1995 VL 253 IS 1-2 BP 121 EP 134 DI 10.1016/0921-4534(95)00454-8 PG 14 WC Physics, Applied SC Physics GA TC910 UT WOS:A1995TC91000016 ER PT J AU JOHNSTON, PG BEHAN, KA ALLEGRA, CJ DRAKE, JC AF JOHNSTON, PG BEHAN, KA ALLEGRA, CJ DRAKE, JC TI FLUOROURACIL - ACTIVE IN ZD1694 (TOMUDEX)-RESISTANT CELL-LINES WITH MARKEDLY ELEVATED THYMIDYLATE SYNTHASE LEVELS SO JOURNAL OF THE NATIONAL CANCER INSTITUTE LA English DT Letter RP JOHNSTON, PG (reprint author), USN HOSP,NCI,NAVY MED ONCOL BRANCH,8901 WISCONSIN AVE,BLDG 8,RM 5101,BETHESDA,MD 20889, USA. NR 10 TC 14 Z9 14 U1 0 U2 0 PU NATL CANCER INSTITUTE PI BETHESDA PA 9030 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0027-8874 J9 J NATL CANCER I JI J. Natl. Cancer Inst. PD OCT 18 PY 1995 VL 87 IS 20 BP 1558 EP 1559 DI 10.1093/jnci/87.20.1558-a PG 2 WC Oncology SC Oncology GA RZ070 UT WOS:A1995RZ07000018 PM 7563193 ER PT J AU QIAN, W ROHRER, GS SKOWRONSKI, M DOVERSPIKE, K ROWLAND, LB GASKILL, DK AF QIAN, W ROHRER, GS SKOWRONSKI, M DOVERSPIKE, K ROWLAND, LB GASKILL, DK TI OPEN-CORE SCREW DISLOCATIONS IN GAN EPILAYERS OBSERVED BY SCANNING FORCE MICROSCOPY AND HIGH-RESOLUTION TRANSMISSION ELECTRON-MICROSCOPY SO APPLIED PHYSICS LETTERS LA English DT Article AB Structural investigations of organometallic vapor phase epitaxy grown alpha-GaN films using high-resolution transmission electron microscopy and scanning force microscopy have revealed the presence of tunnel-like defects with 35-500 Angstrom radii that are aligned along the growth direction of the crystal and penetrate the entire epilayer. These defects, which are termed ''nanopipes,'' terminate on the free surface of the film at the centers of hexagonal growth hillocks and form craters with 600-1000 Angstrom radii. Either one or two pairs of monolayer-height spiral steps were observed to emerge from the surface craters which allowed us to conclude that nanopipes are the open cores of screw dislocations. The measured dimensions of the defects are compared to Frank's theory for the open-core dislocation. (C) 1995 American Institute of Physics. C1 USN,RES LAB,ADV LAB MAT SYNTH,WASHINGTON,DC 20375. RP QIAN, W (reprint author), CARNEGIE MELLON UNIV,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15213, USA. RI Rowland, Larry/C-4487-2008; Rohrer, Gregory/A-9420-2008; Skowronski, Marek/A-8934-2011 OI Rohrer, Gregory/0000-0002-9671-3034; Skowronski, Marek/0000-0002-2087-0068 NR 12 TC 162 Z9 164 U1 3 U2 25 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 16 PY 1995 VL 67 IS 16 BP 2284 EP 2286 DI 10.1063/1.115127 PG 3 WC Physics, Applied SC Physics GA RZ451 UT WOS:A1995RZ45100008 ER PT J AU CARLOS, WE GLASER, ER KENNEDY, TA NAKAMURA, S AF CARLOS, WE GLASER, ER KENNEDY, TA NAKAMURA, S TI PARAMAGNETIC-RESONANCE IN GAN-BASED LIGHT-EMITTING-DIODES SO APPLIED PHYSICS LETTERS LA English DT Article ID SPIN-DEPENDENT RECOMBINATION; DETECTED MAGNETIC-RESONANCE; ELECTROLUMINESCENCE; JUNCTION; GROWTH AB Significant advances in GaN-based materials and devices have prompted intense interest in the group III nitrides. In this letter, we report electroluminescence-detected magnetic resonance (ELDMR) and electrically detected magnetic resonance (EDMR) results on InGaN/AlGaN double heterostructures which have an intense blue emission. The dominant feature detected by either technique is a broad resonance (Delta B similar to 21 mT) at g approximate to 2.00. Our ELDMR measurements show that this is associated with the blue emission and we ascribe this resonance signal to a deep Zn-related acceptor. A second resonance, resolved in EDMR, is tentatively identified as a deep donor trap. Based on our results we propose a model for the blue emission from these diodes. (C) 1995 American Institute of Physics. C1 NICHIA CHEM IND LTD,TOKUSHIMA 774,JAPAN. RP CARLOS, WE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 16 Z9 16 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 16 PY 1995 VL 67 IS 16 BP 2376 EP 2378 DI 10.1063/1.114350 PG 3 WC Physics, Applied SC Physics GA RZ451 UT WOS:A1995RZ45100039 ER PT J AU GAMMON, D SNOW, ES KATZER, DS AF GAMMON, D SNOW, ES KATZER, DS TI EXCITED-STATE SPECTROSCOPY OF EXCITONS IN SINGLE QUANTUM DOTS SO APPLIED PHYSICS LETTERS LA English DT Article ID WELL STRUCTURES; INTERFACES AB We describe the results of a photoluminescence study of quantum dots which are formed by interface fluctuations in narrow GaAs/AlAs single quantum wells. The photoluminescence measurements were made with lateral spatial resolution ranging from the macroscopic down to the optical near-field regime. For spatial resolution below a few square microns the photoluminescence from individual quantum dots is resolved. Photoluminescence excitation spectroscopy is used to study the excited state spectrum of an exciton bound in a single quantum dot. (C) 1995 American Institute of Physics. RP GAMMON, D (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 12 TC 114 Z9 114 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 16 PY 1995 VL 67 IS 16 BP 2391 EP 2393 DI 10.1063/1.114557 PG 3 WC Physics, Applied SC Physics GA RZ451 UT WOS:A1995RZ45100044 ER PT J AU RANDALL, CE RUSCH, DW BEVILACQUA, RM LUMPE, J AINSWORTH, TL DEBRESTIAN, D FROMM, M KRIGMAN, SS HORNSTEIN, JS SHETTLE, EP OLIVERO, JJ CLANCY, RT AF RANDALL, CE RUSCH, DW BEVILACQUA, RM LUMPE, J AINSWORTH, TL DEBRESTIAN, D FROMM, M KRIGMAN, SS HORNSTEIN, JS SHETTLE, EP OLIVERO, JJ CLANCY, RT TI PRELIMINARY-RESULTS FROM POAM-II - STRATOSPHERIC OZONE AT HIGH NORTHERN LATITUDES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB We present results from the first 18 months of measurements by the Polar Ozone and Aerosol Measurement experiment (FOAM TI) in the northern hemisphere. FOAM TI was launched on 25 September 1993, onboard the SPOT-3 satellite into a sun-synchronous polar orbit. The results presented here span a latitude range from about 55 degrees to 71 degrees, and an altitude range from about 18 to 35 km. Our results compare well with SAGE II data from 1986 to 1991. The observed variability in the zonally-averaged ozone retrievals is due to a convolution of the true seasonal variation in ozone with the seasonal variation in latitude of the FOAM Ii measurements. The seasonal variations in ozone at different altitudes reflect a transition between summer-time photochemical and dynamical control around 25 km. The longitudinal variation in ozone densities correlates well with the position of the measurement with respect to the polar vortex. Mixing ratios inside the vortex during the winters of 1993-1994 and 1994-1995 are indicative of enhanced descent within the vortex, as well as other dynamical processes and possibly chemical depletion. C1 USN,RES LAB,WASHINGTON,DC 20375. CPI,FAIRFAX,VA 22031. EMBRY RIDDLE AERONAUT UNIV,DAYTONA BEACH,FL 32114. INST SPACE SCI,BOULDER,CO 80303. RP RANDALL, CE (reprint author), UNIV COLORADO,ATMOSPHER & SPACE PHYS LAB,CAMPUS BOX 392,BOULDER,CO 80309, USA. RI Fromm, Michael/F-4639-2010 NR 14 TC 23 Z9 23 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD OCT 15 PY 1995 VL 22 IS 20 BP 2733 EP 2736 DI 10.1029/95GL02649 PG 4 WC Geosciences, Multidisciplinary SC Geology GA TA643 UT WOS:A1995TA64300014 ER PT J AU BASHKANSKY, M BATTLE, P MAHON, R REINTJES, J AF BASHKANSKY, M BATTLE, P MAHON, R REINTJES, J TI NEW REGIME OF CONICAL EMISSIONS IN MULTILEVEL OPTICALLY-PUMPED ATOMIC VAPORS SO OPTICS COMMUNICATIONS LA English DT Note ID SODIUM VAPOR; BARIUM VAPOR; PROPAGATION; LIGHT; SYSTEM AB We present experimental results of spectral and spatial properties of the laser-pumped cascade emissions from sodium vapor when the 3S(1/2)-4P(1/2,3/2) transitions of sodium are excited with resonant 330 nm narrowband radiation. We observe a pronounced hollow-conical emission of the 3P-3S cascade transition only. The angle and frequency of the hollow-conical radiation depend on the sodium number density. A qualitative theoretical approach that explains the observed effects is outlined. RP BASHKANSKY, M (reprint author), USN,RES LAB,DIV OPT SCI,LASER PHYS BRANCH,CODE 5640,WASHINGTON,DC 20375, USA. NR 22 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD OCT 15 PY 1995 VL 120 IS 3-4 BP 189 EP 193 DI 10.1016/0030-4018(95)00425-8 PG 5 WC Optics SC Optics GA TA224 UT WOS:A1995TA22400013 ER PT J AU TRAN, P AF TRAN, P TI PHOTONIC-BAND-STRUCTURE CALCULATION OF MATERIAL POSSESSING KERR NONLINEARITY SO PHYSICAL REVIEW B LA English DT Note ID PERIODIC STRUCTURES; GAP SOLITONS; SUPERLATTICES; PROPAGATION; WAVES AB A technique for calculating the photonic band structure of a photonic crystal possessing Kerr nonlinearity and a calculation for a two-dimensional system that shows shifting of the band gap due to the nonlinearity are presented. RP TRAN, P (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,DIV RES & TECHNOL,CHINA LAKE,CA 93555, USA. NR 20 TC 55 Z9 60 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1995 VL 52 IS 15 BP 10673 EP 10676 DI 10.1103/PhysRevB.52.10673 PG 4 WC Physics, Condensed Matter SC Physics GA TA852 UT WOS:A1995TA85200003 ER PT J AU FRAUENHEIM, T WEICH, F KOHLER, T UHLMANN, S POREZAG, D SEIFERT, G AF FRAUENHEIM, T WEICH, F KOHLER, T UHLMANN, S POREZAG, D SEIFERT, G TI DENSITY-FUNCTIONAL-BASED CONSTRUCTION OF TRANSFERABLE NONORTHOGONAL TIGHT-BINDING POTENTIALS FOR SI AND SIH SO PHYSICAL REVIEW B LA English DT Article ID SMALL SILICON CLUSTERS; MOLECULAR-DYNAMICS; EQUILIBRIUM GEOMETRIES; ELECTRONIC-STRUCTURE; APPROXIMATION; TRANSFORMATIONS; SIMULATIONS; ENTHALPIES; DIFFUSION; STABILITY AB We apply a previously reported density-functional-based scheme for the construction of common nonorthogonal tight-binding (TB) matrix elements for Si and SiH within the framework of the linear combination of atomic orbitals formalism using the local-density approximation. By only considering two-center integrals the Hamiltonian and overlap matrix elements are calculated out of suitable input densities and potentials rather than fitted to experimental data. The calculation of forces is easy and allows an application of the method to molecular-dynamics simulations. Despite its simplicity the method is proven to be sufficiently accurate and transferable to all-scale silicon and silicon-hydrogen structures including defect configurations. For an overall wide use within nonorthogonal TB schemes we derive analytical functions for the Si-Si, Si-H, and H-H Hamiltonian and overlap matrix elements. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. TECH UNIV DRESDEN,INST THEORET PHYS,D-01062 DRESDEN,GERMANY. RP FRAUENHEIM, T (reprint author), TECH UNIV CHEMNITZ,INST PHYS,CHEMNITZ,GERMANY. RI Frauenheim, Thomas/C-5653-2015 OI Frauenheim, Thomas/0000-0002-3073-0616 NR 54 TC 113 Z9 113 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1995 VL 52 IS 15 BP 11492 EP 11501 DI 10.1103/PhysRevB.52.11492 PG 10 WC Physics, Condensed Matter SC Physics GA TA852 UT WOS:A1995TA85200120 ER PT J AU WILLEMS, G AF WILLEMS, G TI DELAYED SWEEP - AN OLD TRICK SO EDN LA English DT Letter RP WILLEMS, G (reprint author), USN,BIODYNAM LAB,NEW ORLEANS,LA 70189, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CAHNERS-DENVER PUBLISHING CO PI HIGHLANDS RANCH PA 8773 S RIDGELINE BLVD, HIGHLANDS RANCH, CO 80126-2329 SN 0012-7515 J9 EDN JI EDN PD OCT 12 PY 1995 VL 40 IS 21 BP 39 EP 39 PG 1 WC Engineering, Electrical & Electronic SC Engineering GA RZ681 UT WOS:A1995RZ68100015 ER PT J AU JUSTH, EW KUB, FJ AF JUSTH, EW KUB, FJ TI ANALOG CMOS CONTINUOUS-TIME TAPPED DELAY-LINE CIRCUIT SO ELECTRONICS LETTERS LA English DT Article DE ANALOG CIRCUITS; CMOS INTEGRATED CIRCUITS; DELAY CIRCUITS; DELAY LINES AB A microelectronic 20-stage tapped delay line consisting of cascaded lowpass filter amplifier stages has been demonstrated. The delay per tap is similar to 2.7ns, and different versions have been optimised for pulsed and narrowband operation in the 30 - 70 MHz frequency range. Potential applications are in radar and adaptive antenna systems. C1 USN,RES LAB,WASHINGTON,DC 20375. RP JUSTH, EW (reprint author), SFA INC,4709 MILTFRED TER,ROCKVILLE,MD 20853, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD OCT 12 PY 1995 VL 31 IS 21 BP 1793 EP 1794 DI 10.1049/el:19951285 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA TA920 UT WOS:A1995TA92000001 ER PT J AU PACE, PE WALLEY, RD PIEPER, RJ POWERS, JP AF PACE, PE WALLEY, RD PIEPER, RJ POWERS, JP TI 5-BIT GUIDED-WAVE SNS TRANSFER CHARACTERISTICS SO ELECTRONICS LETTERS LA English DT Article DE ANALOG DIGITAL CONVERSION; LIGHT INTERFEROMETERS; OPTICAL DELAY LINES AB The experimental transfer characteristics of a three-channel 5 bit symmetrical number system (SNS) guided-wave ADC are reported. The SNS preprocessing provides resolution greater than 1 bit per interferometer. The results serve to demonstrate the feasibility of the SNS ADC concept. RP PACE, PE (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE ECPC,MONTEREY,CA 93943, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD OCT 12 PY 1995 VL 31 IS 21 BP 1799 EP 1800 DI 10.1049/el:19951231 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA TA920 UT WOS:A1995TA92000005 ER PT J AU GAN, WQ CHENG, CC FANG, C AF GAN, WQ CHENG, CC FANG, C TI ON THERMAL HYDRODYNAMICAL MODELS OF SOLAR-FLARES WITH A HIGH INITIAL CORONAL DENSITY SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDRODYNAMICS; SUN, CHROMOSPHERE; SUN, CORONA; SUN, FLARES ID XIX SPECTRAL EMISSION; X-RAY-SPECTRA; IMPULSIVE PHASE; NUMERICAL SIMULATIONS; RESONANCE LINE; MASS UPFLOW; LOOP; DIAGNOSTICS; SPECTROSCOPY; EVAPORATION AB We present some hydrodynamical results for a thermal model of solar flares with a high initial coronal density (5-11 x 10(10) cm(-3)) in the flaring loop. The thermal energy is assumed to be released around the top of the loop. The results of the hydrodynamic simulation show that, in the initial phase of the flare, there is always a strong downward motion in the corona. This motion with a velocity as large as 700 km s(-1) can last a few tens of seconds, leading to a pronounced redshift of the Ca XIX w line. This is not consistent with the observations of majority of flares, which show predominantly blueshifted or blue-asymmetric Ca XIX and Fe XXV lines. However, the results could account for the redshifted Ca XIX emission observed in a small number of flares, indicating a high initial coronal density in these flares. We conclude that only when the initial coronal density is smaller than 10(10) cm(-3) can the strong downward motion of the coronal material at the early phase of the flare be suppressed. When we combine the present and previous results of flare simulations, it appears that a model with both thermal and nonthermal energy sources may be more realistic in describing the flare hydrodynamics. C1 NANJING UNIV,DEPT ASTRON,NANJING 210008,PEOPLES R CHINA. CCAST,WORLD LAB,BEIJING,PEOPLES R CHINA. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP GAN, WQ (reprint author), PURPLE MT OBSERV,NANJING 210008,PEOPLES R CHINA. NR 40 TC 6 Z9 8 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 10 PY 1995 VL 452 IS 1 BP 445 EP 450 DI 10.1086/176315 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RX157 UT WOS:A1995RX15700041 ER PT J AU WANG, YM SHEELEY, NR AF WANG, YM SHEELEY, NR TI CORONAL PLUMES AND THEIR RELATIONSHIP TO NETWORK ACTIVITY SO ASTROPHYSICAL JOURNAL LA English DT Article DE SOLAR WIND; SUN, ACTIVITY; SUN, CORONA; SUN, MAGNETIC FIELDS; SUN, UV RADIATION; SUN, X-RAYS; GAMMA RAYS ID MAGNETIC-FIELDS; POLAR PLUME; HOLES AB Using Skylab extreme-ultraviolet spectroheliograms, we address the question of what lies under a coronal plume. Plumes and their base areas, both inside polar coronal holes and within lower latitude holes near central meridian, are identified in the Mg IX lambda 368 emission line. While some (usually spike-shaped) plumes show a strongly enhanced Mg IX core, others (sheetlike in appearance) are characterized by a much more diffuse base which may extend over several supergranules. The base areas are found to contain collections of compact (although not always intense) Ne VII lambda 465 features, whose locations in turn generally coincide with enhancements in the He II lambda 304 network inside the coronal hole. Bright plumes always show intense network features within their base areas, but the converse does not hold: not every Ne VII or He II bright point has an associated Mg IX plume. By comparing the locations of plumelike Mg IX ''haze'' in a lower latitude hole with a simultaneous high-resolution magnetogram, we infer that coronal plumes occur near regions of mixed magnetic polarity. We suggest a mechanism for plume formation, whereby small bipoles within a coronal hole reconnect with unipolar flux concentrations located at network junctions. RP WANG, YM (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7672, WASHINGTON, DC 20375 USA. NR 30 TC 45 Z9 46 U1 0 U2 0 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 OCT 10 PY 1995 VL 452 IS 1 BP 457 EP + DI 10.1086/176317 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RX157 UT WOS:A1995RX15700043 ER PT J AU MEIER, RR AF MEIER, RR TI SOLAR LYMAN SERIES LINE-PROFILES AND ATOMIC-HYDROGEN EXCITATION RATES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATMOSPHERIC EFFECTS; ATOMIC PROCESSES; LINE, PROFILES; SUN, UV RADIATION ID ALPHA-LINE; GEOCORONAL STRUCTURE; IRRADIANCE; EMISSION; 834-A AB The atomic hydrogen Lyman series lines on the Sun were observed in high spectral resolution (0.14 Angstrom) during a Naval Research Laboratory sounding rocket flight in 1962 August, a period of low solar activity. The spectral fluxes which had not been previously published reveal strong intrinsic reversal of the Ly alpha and Ly beta lines, but Gaussian shaped lines are seen for Lyman 3-10. Placing the line fluxes on an absolute scale through use of independent measurements allows the calculation of excitation rates which are applicable to planetary and interplanetary hydrogen atoms. In these calculations, the effect of cascade was evaluated with a detailed model of the branching rates following Lyman series excitation. Application of the calculated excitation rates to measurements of Ba alpha emission in the terrestrial nightglow shows that emission lines arising from the 3 S-2 and 3 D-2 states can contribute 6.4% and 0.7% of the total emission, respectively, with the remainder resulting from fluorescence from direct Ly beta excitation of the 3 P-2 state. These results are consistent with ground-based observations which show line reddening with an excess intensity of 10% +/- 5% relative to that expected from Ly beta excitation of the 3 P-2 State of hydrogen. RP MEIER, RR (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7640,WASHINGTON,DC 20375, USA. RI Meier, Robert/G-4749-2014 OI Meier, Robert/0000-0001-8497-7115 NR 29 TC 28 Z9 29 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 10 PY 1995 VL 452 IS 1 BP 462 EP 471 DI 10.1086/176318 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RX157 UT WOS:A1995RX15700044 ER PT J AU HILLEBRECHT, FU ROSE, HB KINOSHITA, T IDZERDA, YU VANDERLAAN, G DENECKE, R LEY, L AF HILLEBRECHT, FU ROSE, HB KINOSHITA, T IDZERDA, YU VANDERLAAN, G DENECKE, R LEY, L TI PHOTOELECTRON DIFFRACTION IN MAGNETIC LINEAR DICHROISM SO PHYSICAL REVIEW LETTERS LA English DT Article ID CORE-LEVEL PHOTOEMISSION; CIRCULAR-DICHROISM; AUGER-ELECTRON; WAVE; DISTRIBUTIONS; SCATTERING; SURFACES; FILMS AB The angular dependence of the magnetic linear dichroism in Fe and Co 3p photoemission is investigated. The dichroism has the same symmetry behavior as in the free atom, and vanishes when integrated over all angles. However, the angular dependence shows pronounced deviations from the sin2 theta dependence of the free atom. The qualitative features can be understood in terms of a photoelectron diffraction picture, taking into account the details of the final state wave functions with respect to angular momentum and magnetic quantum numbers. C1 USN,RES LAB,WASHINGTON,DC 20375. SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. UNIV ERLANGEN NURNBERG,INST THEORET PHYS 2,D-91058 ERLANGEN,GERMANY. RP HILLEBRECHT, FU (reprint author), UNIV DUSSELDORF,INST ANGEW PHYS,D-40225 DUSSELDORF,GERMANY. RI van der Laan, Gerrit/Q-1662-2015 OI van der Laan, Gerrit/0000-0001-6852-2495 NR 25 TC 58 Z9 58 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 9 PY 1995 VL 75 IS 15 BP 2883 EP 2886 DI 10.1103/PhysRevLett.75.2883 PG 4 WC Physics, Multidisciplinary SC Physics GA RY216 UT WOS:A1995RY21600025 ER PT J AU PEARSON, DH TONUCCI, RJ AF PEARSON, DH TONUCCI, RJ TI NANOCHANNEL GLASS REPLICA MEMBRANES SO SCIENCE LA English DT Article AB The preparation of thin metallic membranes containing uniform, patterned voids with diameters as small as 40 nanometers and packing densities greater than 3 x 10(9) voids per square centimeter is described. These membranes, made of platinum, gold, tungsten, and molybdenum, have been fabricated by thin-film deposition with nanochannel glass wafers as substrates. The membranes are well suited for use as masks in substrate patterning applications such as ion implantation, reactive ion etching, and materials deposition. Results are presented on their use in the parallel patterning of silicon by direct materials deposition with features in the 100-nanometer size regime. RP PEARSON, DH (reprint author), USN,RES LAB,CODE 5614,WASHINGTON,DC 20375, USA. NR 19 TC 52 Z9 52 U1 2 U2 12 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 6 PY 1995 VL 270 IS 5233 BP 68 EP 70 DI 10.1126/science.270.5233.68 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RY302 UT WOS:A1995RY30200032 ER PT J AU OWRUTSKY, JC RICE, JK GUHA, S STEINER, P LANG, W AF OWRUTSKY, JC RICE, JK GUHA, S STEINER, P LANG, W TI ULTRAFAST ABSORPTION IN FREESTANDING POROUS SILICON FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID MICROSTRUCTURE; LUMINESCENCE AB Ultrafast absorption studies on free-standing porous silicon films have been carried out at room temperature to investigate the carrier dynamics and the luminescence mechanism. Ultraviolet and visible excitations were used on an as-prepared sample and two annealed samples. Transient absorption curves of UV pumped, as-prepared samples contain a fast decay (tau(f)) of 0.8+/-0.2 ps and a slower decay of >30 ps. tau(f) is found to be shorter for both the 500 degrees C annealed sample with UV excitation and for the as-prepared sample with visible excitation. The faster decay rates suggest that the subpicosecond component of the transient absorption may be due to carries thermalization rather than core-to-surface state excitation transfer. (C) 1995 American Institute of Physics. C1 FRAUNHOFER INST SOLID STATE TECHNOL,W-8000 MUNICH,GERMANY. RP OWRUTSKY, JC (reprint author), USN,RES LAB,CODE 6111,WASHINGTON,DC 20375, USA. RI Owrutsky, Jeffrey/K-7649-2012; Lang, Walter/G-3835-2011; OI Lang, Walter/0000-0002-9813-5231 NR 21 TC 8 Z9 8 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 2 PY 1995 VL 67 IS 14 BP 1966 EP 1968 DI 10.1063/1.114755 PG 3 WC Physics, Applied SC Physics GA RX495 UT WOS:A1995RX49500004 ER PT J AU HENDERSON, DR AF HENDERSON, DR TI THE REAL BUDGET PROBLEM SO FORTUNE LA English DT Article C1 STANFORD UNIV,HOOVER INST,STANFORD,CA 94305. RP HENDERSON, DR (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU TIME INC PI NEW YORK PA TIME & LIFE BUILDING ROCKEFELLER CENTER, NEW YORK, NY 10020-1393 SN 0015-8259 J9 FORTUNE JI Fortune PD OCT 2 PY 1995 VL 132 IS 7 BP 63 EP 64 PG 2 WC Business SC Business & Economics GA RU334 UT WOS:A1995RU33400011 ER PT J AU PHILLIPS, L AF PHILLIPS, L TI INITIATION OF DETONATIONS IN 3-DIMENSIONAL CRYSTALS WITH DEFECTS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID SHOCK-INDUCED DETONATIONS; SIMULATION; SOLIDS AB We examine shock-induced detonation in a three-dimensional model of nitromethane crystal. The crystal may contain a defect in the form of a vacancy cluster, or small void. Three regimes are identified: the shock can be weak enough that no chemical bonds are broken; the shock can be so strong that a detonation front is established in the perfect crystal; or the shock can be of intermediate strength, where chemical activity is dependent on the existence of the defect. In all regimes, the defect increases the reaction rate and causes a hot spot to appear. RP PHILLIPS, L (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 24 TC 5 Z9 5 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD OCT 2 PY 1995 VL 7 IS 40 BP 7813 EP 7822 DI 10.1088/0953-8984/7/40/012 PG 10 WC Physics, Condensed Matter SC Physics GA RY543 UT WOS:A1995RY54300012 ER PT J AU WEEKS, JD SELINGER, RLB BROUGHTON, JQ AF WEEKS, JD SELINGER, RLB BROUGHTON, JQ TI SELF-CONSISTENT TREATMENT OF REPULSIVE AND ATTRACTIVE FORCES IN NONUNIFORM LIQUIDS SO PHYSICAL REVIEW LETTERS LA English DT Article ID VAPOR INTERFACE; SIMPLE FLUID; WALL AB Structural and thermodynamic properties of a nonuniform liquid are related to those of a reference fluid with purely repulsive intermolecular forces in an external field. A new equation for that field derived from the Yvon-Born-Green hierarchy permits a self-consistent description of correlations induced by the exact repulsive forces and a mean field treatment of the attractive forces. Predictions of the theory for drying effects at repulsive walls and for the liquid-vapor interface are compared to molecular dynamics simulations. C1 UNIV MARYLAND,DEPT CHEM,COLLEGE PK,MD 20742. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. USN,RES LAB,WASHINGTON,DC 20375. RP WEEKS, JD (reprint author), UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLLEGE PK,MD 20742, USA. OI Selinger, Robin/0000-0002-6519-9685 NR 18 TC 33 Z9 33 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 2 PY 1995 VL 75 IS 14 BP 2694 EP 2697 DI 10.1103/PhysRevLett.75.2694 PG 4 WC Physics, Multidisciplinary SC Physics GA RX456 UT WOS:A1995RX45600016 ER PT J AU BRAIMAN, Y DITTO, WL WIESENFELD, K SPANO, ML AF BRAIMAN, Y DITTO, WL WIESENFELD, K SPANO, ML TI DISORDER-ENHANCED SYNCHRONIZATION SO PHYSICS LETTERS A LA English DT Article ID JOSEPHSON-JUNCTION ARRAYS; ELECTRONS AB We find that an increase in the disorder of an array of Josephson junctions can lead to significant improvement in the synchronization of the array. Both this effect and the opposite, more expected behavior are seen over a broad parameter range. C1 USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. RP BRAIMAN, Y (reprint author), GEORGIA INST TECHNOL, SCH PHYS, ATLANTA, GA 30332 USA. RI Spano, Mark/B-6883-2011; OI Ditto, William/0000-0002-7416-8012 NR 12 TC 63 Z9 63 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD OCT 2 PY 1995 VL 206 IS 1-2 BP 54 EP 60 DI 10.1016/0375-9601(95)00570-S PG 7 WC Physics, Multidisciplinary SC Physics GA RX189 UT WOS:A1995RX18900009 ER PT J AU BASSILY, S KOTKAT, A GRAY, G HYAMS, KC BROWN, FM IMAM, IZ ARTHUR, R AF BASSILY, S KOTKAT, A GRAY, G HYAMS, KC BROWN, FM IMAM, IZ ARTHUR, R TI COMPARATIVE-STUDY OF THE IMMUNOGENICITY AND SAFETY OF 2 DOSING SCHEDULES OF HEPATITIS-B VACCINE IN NEONATES SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID TRANSMISSION; INFECTION; CHILDREN; EFFICACY; INFANCY; RISK AB Healthy Egyptian neonates born to hepatitis B surface antigen (HBsAg)-seronegative mothers were randomly enrolled in one of three vaccination schedules. A dose of 2.5 mu g of recombinant HE vaccine was given at birth, two, and six months of age (group A) or two, four, and nine months of age (group B). These two groups and a third control group (group C) also were given the other routine childhood vaccines (BCG, DPT, polio, and measles). Blood samples were taken one month after the third vaccine dose in groups A (seven months of age) and B (10 months of age), and a second follow-up blood sample was taken at the age of 18 months for all three groups. Sera were tested for HBsAg and antibody to hepatitis B core antigen, and quantitatively for antibody to hepatitis B surface antigen (anti-HBs) using commercial enzyme immunoassay kits. The vaccine was well tolerated and side effects were limited to local soreness, redness, or temporary swelling. Among 590 infants who were followed-up, good (51-300 mIU anti-HBs/ml) or excellent (> 300 mIU/ml) immune responses occurred in 85% of the infants in group A and in 96% in group B. Geometric mean titers of anti-HBs at the first and second follow-up were 306 and 55 mIU/ml in group A, and 1,492 and 147 mIU/ml in group B. The recombinant HE vaccine is safe and immunogenic when given in three doses of 2.5 mu g in either regimen, but delay of the booster dose of the vaccine until nine months after birth produced a higher immune response. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. HIGH INST PUBL HLTH,ALEXANDRIA,EGYPT. USN,HLTH RES CTR,DIV CLIN EPIDEMIOL,SAN DIEGO,CA. USN,MED RES INST,BETHESDA,MD. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT MOLEC MICROBIOL & IMMUNOL,BALTIMORE,MD. NR 18 TC 8 Z9 9 U1 0 U2 1 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD OCT PY 1995 VL 53 IS 4 BP 419 EP 422 PG 4 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA TD727 UT WOS:A1995TD72700017 PM 7485697 ER PT J AU COLE, FH COLE, FH KHANDEKAR, A MAXWELL, JM PATE, JW WALKER, WA AF COLE, FH COLE, FH KHANDEKAR, A MAXWELL, JM PATE, JW WALKER, WA TI VIDEO-ASSISTED THORACIC-SURGERY - PRIMARY THERAPY FOR SPONTANEOUS PNEUMOTHORAX SO ANNALS OF THORACIC SURGERY LA English DT Article ID RECURRENT SPONTANEOUS PNEUMOTHORAX; TETRACYCLINE; PLEURODESIS; RESECTION AB Background. This study assessed the role of video-assisted thoracic surgery (VATS) in current therapy for spontaneous pneumothorax. Methods. We compared a retrospective series of 89 patients treated conventionally with a consecutive group of 30 patients undergoing VATS pleural abrasion. The 89 earlier patients were predominantly male (81%). Treatment groups included observation/aspiration (7 or 17%), tube thoracostomy (32 or 36%), multiple tubes (7 or 9%), and thoracotomy (43 or 48%). Of the 30 patients treated with VATS, 18 (66%) were male. Primary indications for operation were recurrent pneumothorax (17) and persistent air leak (9). Results. Hospital lengths of stay (LOS) for the earlier group were 5 days for simple tube and 7 days for primary thoracotomy; LOS for initial intervention followed by thoracotomy exceeded 15 days in all subgroups. The average LOS in the VATS group was 13 days; 6 patients treated with primary VATS (no chest tube) had a mean LOS of 6.5 days. Complications included 3 (10%) prolonged air leaks (more than 7 days) and 2 (7%) early recurrences. Conclusions. We do not recommend VATS as primary therapy for spontaneous pneumothorax; tube thoracostomy remains the treatment of choice. However, we strongly support surgical intervention early (3 days) in patients with a persistent air leak, and as primary therapy in a nonurgent situation if standard indications exist. This study shows no advantage of VATS over conventional thoracotomy in hospital stay or complication rate. C1 UNIV TENNESSEE, CTR HLTH SCI, THORAC SURG SECT, MEMPHIS, TN 38163 USA. USN, MED CTR SAN DIEGO, DEPT THORAC SURG, SAN DIEGO, CA 92152 USA. NR 15 TC 42 Z9 42 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0003-4975 J9 ANN THORAC SURG JI Ann. Thorac. Surg. PD OCT PY 1995 VL 60 IS 4 BP 931 EP 935 DI 10.1016/0003-4975(95)00598-F PG 5 WC Cardiac & Cardiovascular Systems; Respiratory System; Surgery SC Cardiovascular System & Cardiology; Respiratory System; Surgery GA RZ179 UT WOS:A1995RZ17900011 PM 7574997 ER PT J AU SEELY, JF KOWALSKI, MP HUNTER, WR BARBEE, TW CRUDDACE, RG RIFE, JC AF SEELY, JF KOWALSKI, MP HUNTER, WR BARBEE, TW CRUDDACE, RG RIFE, JC TI NORMAL-INCIDENCE EFFICIENCIES IN THE 115-340-ANGSTROM WAVELENGTH REGION OF REPLICAS OF THE SKYLAB 3600-LINE/MM GRATING WITH MULTILAYER AND GOLD COATING SO APPLIED OPTICS LA English DT Article ID CRYSTAL MONOCHROMATOR; PERFORMANCE AB Multilayer and gold coatings were applied to replicas of the 3600-line/mm ruled grating that was developed for the Naval Research Laboratory S082A spectroheliograph that was flown on the Skylab spacecraft. The Mo-Si multilayer coating had a peak normal-incidence reflectance of 50% at a wavelength of 136 Angstrom. The normal-incidence efficiency of the multilayer-coated grating was measured by the use of synchrotron radiation and was compared with the efficiency of the gold-coated replica grating in the 115-340-Angstrom wavelength region. The peak efficiency of the multilayer grating was 1.3% in the 133-137-Angstrom. region and was a factor of 65 higher than the efficiency of the gold grating. The multilayer and gold coated gratings, as well as an uncoated replica grating substrate, were characterized by the use of a scanning probe microscope. The rms microroughness of the uncoated and multilayer-coated gratings was 10 Angstrom, and the microroughness of the gold grating was 16 Angstrom. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. SFA INC,LANDOVER,MD 20785. RP SEELY, JF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 14 Z9 14 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD OCT 1 PY 1995 VL 34 IS 28 BP 6453 EP 6458 PG 6 WC Optics SC Optics GA RW227 UT WOS:A1995RW22700019 PM 21060494 ER PT J AU OBRIEN, TP MAGUIRE, MG FINK, NE ALFONSO, E MCDONNELL, P SHEPPARD, JD BODNER, BI RUSCH, A OLSON, RJ LUCIUS, R JACKSON, A LOIDENIX, M MAMALIS, N KEANEY, R PFLUGFELDER, S FORSTER, RK HUANG, A DELCALVO, M SUTPHIN, J DOHODA, R BLANTON, C TANNER, G GOTTSCH, D STARK, WJ LIVINGSTON, A BELIN, MW GARZA, D CUNNINGHAM, RD CROFT, K PENNELL, J KIRKPATRICK, P LUSTBADER, J LEMP, M PLAVNIEKS, S FARRELL, P SOONG, HK MEYER, RF SUGAR, A WALDO, M STAMLER, JF VERDIER, DD PERRY, H DONNENFELD, E KENYON, K RAPOZA, P MILLER, D KENNEALLY, M GRENE, RB WELLEMEYER, M LANKSTON, P SERDAREVIC, O KELLY, L MATHERS, WD STRIKE, D FOURAKER, B WILSON, T ROWSEY, JJ OLSAKOVSKY, L JONES, R KONEGER, R ANRIYOSN, R KUMAR, S MCCULLEY, J BURRIS, TE BERGER, M CHANDLER, T HWANG, D WHITCHER, J LINDSTOM, E REPASS, R WALTERS, T FUERST, D SHULMAN, D CONSTAD, W DICK, J OSTERHOUT, G KERMAN, J BAYTON, P CHEETHAM, JK ROSENTHAL, A STOECKER, J JENSEN, H LAMBERT, J CHEN, KK LAPINSKI, M CAMPOLONGO, K FITCH, L BRYANT, B MEINDERS, J AF OBRIEN, TP MAGUIRE, MG FINK, NE ALFONSO, E MCDONNELL, P SHEPPARD, JD BODNER, BI RUSCH, A OLSON, RJ LUCIUS, R JACKSON, A LOIDENIX, M MAMALIS, N KEANEY, R PFLUGFELDER, S FORSTER, RK HUANG, A DELCALVO, M SUTPHIN, J DOHODA, R BLANTON, C TANNER, G GOTTSCH, D STARK, WJ LIVINGSTON, A BELIN, MW GARZA, D CUNNINGHAM, RD CROFT, K PENNELL, J KIRKPATRICK, P LUSTBADER, J LEMP, M PLAVNIEKS, S FARRELL, P SOONG, HK MEYER, RF SUGAR, A WALDO, M STAMLER, JF VERDIER, DD PERRY, H DONNENFELD, E KENYON, K RAPOZA, P MILLER, D KENNEALLY, M GRENE, RB WELLEMEYER, M LANKSTON, P SERDAREVIC, O KELLY, L MATHERS, WD STRIKE, D FOURAKER, B WILSON, T ROWSEY, JJ OLSAKOVSKY, L JONES, R KONEGER, R ANRIYOSN, R KUMAR, S MCCULLEY, J BURRIS, TE BERGER, M CHANDLER, T HWANG, D WHITCHER, J LINDSTOM, E REPASS, R WALTERS, T FUERST, D SHULMAN, D CONSTAD, W DICK, J OSTERHOUT, G KERMAN, J BAYTON, P CHEETHAM, JK ROSENTHAL, A STOECKER, J JENSEN, H LAMBERT, J CHEN, KK LAPINSKI, M CAMPOLONGO, K FITCH, L BRYANT, B MEINDERS, J TI EFFICACY OF OFLOXACIN VS CEFAZOLIN AND TOBRAMYCIN IN THE THERAPY FOR BACTERIAL KERATITIS - REPORT FROM THE BACTERIAL-KERATITIS-STUDY-RESEARCH-GROUP SO ARCHIVES OF OPHTHALMOLOGY LA English DT Article ID CORNEAL ULCERS; MICROBIAL KERATITIS; INVITRO ACTIVITY; CIPROFLOXACIN; MANAGEMENT AB Purpose: To compare ofloxacin solution with a combination of fortified antibiotic cefazolin sodium and tobramycin sulfate solutions in the treatment of bacterial keratitis. Methods: Patients under care at any one of 28 participating clinical centers who had an eye with suspected bacterial keratitis were randomly allocated in a double-masked manner to treatment with 0.3% ofloxacin solution or a combination of the fortified antibiotics (1.5% tobramycin and 10.0% cefazolin solutions). Main Outcome Measures: Time to healing defined as complete re-epithelization, accompanied by a nonprogressive stromal infiltrate for two consecutive visits. Secondary outcome measures included patient symptoms and signs of infection and adverse reactions to study medications. Only patients with a positive bacterial corneal culture were included in most analyses. Results: A positive bacterial corneal culture was obtained in 140 (56%) of the 248 enrolled patients. The time to healing was similar among the 73 patients receiving ofloxacin and the 67 patients receiving fortified antibiotics (P=.70). By 7 days after study entry, the keratitis in 37% of the ofloxacin group and 38% of the fortified antibiotics group had healed. By 28 days, keratitis in 89% of the ofloxacin group and 86% of the fortified antibiotics group had healed. Two patients receiving ofloxacin and one receiving fortified antibiotics discontinued study medication because of lack of efficacy. Patients receiving ofloxacin reported substantially less burning and stinging on instillation than the patients receiving fortified antibiotics (P<.001). Five of six patients among the 140 with positive bacterial cultures who had study medications discontinued because of ocular side effects were in the fortified antibiotics group; an additional three patients, all in the fortified antibiotics group, among the remaining 108 receiving study medications had ocular side effects. Conclusions: The efficacy of ofloxacin solution in treating bacterial keratitis is equivalent to that of the fortified cefazolin and tobramycin solutions. The reduced frequency of ocular toxic effects and the relative ease of preparation of ofloxacin are additional considerations. C1 VIRGINIA EYE CONSULTANTS,NORFOLK,VA. UNIV UTAH,MED CTR,SALT LAKE CITY,UT. BASCOM PALMER EYE INST,MIAMI,FL 33136. USN HOSP,SAN DIEGO,CA 92134. ALBANY MED COLL,ALBANY,NY. SCOTT & WHITE MEM HOSP & CLIN,TEMPLE,TX. UNIV OPHTHALM CONSULTANTS WASHINGTON,WASHINGTON,DC. INTERCTY MED GRP,NEWPORT BEACH,CA. UNIV MICHIGAN,ANN ARBOR,MI 48109. VERDIER & STAMLER,GRAND RAPIDS,MI. CORNELL UNIV,N SHORE HOSP,ITHACA,NY 14853. CORNEA CONSULTANTS,BOSTON,MA. GRENE CORNEA,WICHITA,KS. MANHATAN EYE EAR & THROAT HOSP INFIRM,MANHATTAN,KS. STANFORD UNIV,STANFORD,CA 94305. UNIV IOWA,IOWA CITY,IA. UNIV S FLORIDA,TAMPA,FL. NEWPORT EYE CTR,NEWPORT BEACH,CA. DOHENY EYE INST,LOS ANGELES,CA 90033. UNIV TEXAS,SW MED CTR,DALLAS,TX. NW CORNEAL SERV,PORTLAND,OR. AUSTIN DIAGNOST CLIN,AUSTIN,TX. UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. EYE CARE AUSTIN,AUSTIN,TX. WHITE MEM MED CTR,LOS ANGELES,CA. N SAN ANTONIO EYE ASSOCIATES PA,SAN ANTONIO,TX. UNIV MED & DENT NEW JERSEY,NEWARK,NJ 07103. JOHNS HOPKINS UNIV,WILMER EYE INST,OCULAR MICROBIOL LAB,BALTIMORE,MD 21218. ALLERGAN PHARMACEUT INC,CLIN RES,IRVINE,CA 92715. RP OBRIEN, TP (reprint author), JOHNS HOPKINS UNIV,WILMER OPHTHALMOL INST,OCULAR MICROBIOL LAB,600 N WOLFE ST,WOODS 255,BALTIMORE,MD 21287, USA. NR 31 TC 138 Z9 141 U1 0 U2 6 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-9950 J9 ARCH OPHTHALMOL-CHIC JI Arch. Ophthalmol. PD OCT PY 1995 VL 113 IS 10 BP 1257 EP 1265 PG 9 WC Ophthalmology SC Ophthalmology GA RY945 UT WOS:A1995RY94500019 PM 7575256 ER PT J AU PITMAN, KT LASSEN, LF AF PITMAN, KT LASSEN, LF TI PATHOLOGICAL QUIZ CASE 2 - PATHOLOGICAL DIAGNOSIS - SINONASAL UNDIFFERENTIATED CARCINOMA (SNUC) SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Note ID PARA-NASAL SINUSES RP PITMAN, KT (reprint author), USN,PORTSMOUTH,VA 23708, USA. NR 11 TC 10 Z9 10 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0886-4470 J9 ARCH OTOLARYNGOL JI Arch. Otolaryngol. Head Neck Surg. PD OCT PY 1995 VL 121 IS 10 BP 1201 EP & PG 0 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA RY831 UT WOS:A1995RY83100019 PM 7546592 ER PT J AU BOTTCHER, M DERMER, CD AF BOTTCHER, M DERMER, CD TI REVERBERATION MAPPING OF THE CENTRAL REGIONS OF ACTIVE GALACTIC NUCLEI USING HIGH-ENERGY GAMMA-RAY OBSERVATIONS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE GALAXIES, NUCLEI; GALAXIES, ACTIVE; GAMMA RAYS, THEORY; BLACK HOLE PHYSICS ID INTERGALACTIC INFRARED RADIATION; MARKARIAN-421; PHOTONS; GALAXY AB We calculate the time- and energy-dependent opacity of high-energy gamma-rays attenuated by pair-production interactions with accretion-flare photons that are scattered by gas and dust surrounding the nuclei of active galaxies. We show that the temporal behavior of the high-energy opacity cutoff can be used in conjunction with the time history of the accretion flare to determine the location of the gamma-ray emission site, as well as the column density and scale height of the material surrounding the central engine. Reverberation mapping using this technique is now possible for nearby BL Lac objects such as Mkn 421, and will be particularly valuable when the 10 GeV - 100 GeV gamma-ray window is opened, because here the attenuation of distant blazar radiation by the intergalactic infrared background radiation is negligible. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP BOTTCHER, M (reprint author), MAX PLANCK INST RADIOASTRON, POSTFACH 2024, D-53010 BONN, GERMANY. NR 22 TC 18 Z9 18 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD OCT PY 1995 VL 302 IS 1 BP 37 EP 44 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RZ170 UT WOS:A1995RZ17000007 ER PT J AU MCNARONBROWN, K JOHNSON, WN JUNG, GV KINZER, RL KURFESS, JD STRICKMAN, MS DERMER, CD GRABELSKY, DA PURCELL, WR ULMER, MP KAFATOS, M BECKER, PA STAUBERT, R MAISACK, M AF MCNARONBROWN, K JOHNSON, WN JUNG, GV KINZER, RL KURFESS, JD STRICKMAN, MS DERMER, CD GRABELSKY, DA PURCELL, WR ULMER, MP KAFATOS, M BECKER, PA STAUBERT, R MAISACK, M TI OSSE OBSERVATIONS OF BLAZARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE BL LACERTAE OBJECTS, GENERAL; GALAXIES, ACTIVE; GAMMA RAYS, OBSERVATIONS; X-RAYS, GALAXIES ID BL-LACERTAE OBJECTS; ENERGY GAMMA-RADIATION; ACTIVE GALACTIC NUCLEI; X-RAY-SPECTRA; VARIABILITY; EMISSION; 3C-279; QUASARS; MODEL; EGRET AB Results are reported on observations obtained with the Oriented Scintillation Spectrometer Experiment (OSSE) instrument on the Compton Gamma Ray Observatory (CGRO) of 17 active galactic nuclei (AGNs) known to exhibit blazar properties at other wavelengths. These observations span the period from 1991 June through 1994 May. Of the 33 high-confidence EGRET detections of blazars during CGRO observing phases 1 and 2 (1991 May 16-1993 September 7), OSSE has observed eight and detected five, namely 3C 273, 3C 279, PKS 0528+134, CTA 102, and 3C 454.3. Additionally, OSSE has detected the BL Lac sources H1517+65.6 and PKS 2155-304, which were not detected with EGRET. Variability in the energy band 50-150 keV is observed for all of the detected AGNs. The OSSE blazar sources are all well described by simple power-law models with photon number indices, Gamma, varying from 1.0 to 2.1 among sources. When combined with available, although not necessarily contemporaneous, COMPTEL and EGRET observations, four to five detected blazars show clear evidence for spectral breaks between the hard X-ray and medium-energy gamma-ray bands. The exception is the combined OSSE/EGRET data for 3C 279 during 1991 October, where a simple power law with Gamma approximate to 1.9 works equally well. Gamma-ray evidence for beaming in CTA 102, PKS 0528+134, and 3C 454.3 is presented. C1 NORTHWESTERN UNIV, DEPT PHYS & ASTRON, EVANSTON, IL 60208 USA. GEORGE MASON UNIV, CSI, FAIRFAX, VA 22030 USA. UNIV TUBINGEN, INST ASTRON, D-72076 TUBINGEN, GERMANY. RP MCNARONBROWN, K (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7650, WASHINGTON, DC 20375 USA. RI Johnson, Neil/G-3309-2014 NR 58 TC 104 Z9 106 U1 0 U2 0 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 OCT 1 PY 1995 VL 451 IS 2 BP 575 EP 584 DI 10.1086/176245 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RV626 UT WOS:A1995RV62600016 ER PT J AU FELDMAN, U LAMING, JM DOSCHEK, GA AF FELDMAN, U LAMING, JM DOSCHEK, GA TI THE CORRELATION OF SOLAR-FLARE TEMPERATURE AND EMISSION MEASURE EXTRAPOLATED TO THE CASE OF STELLAR FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, FLARES; X-RAYS, STARS ID X-RAY FLARE AB We discuss an extrapolation of a recently discovered correlation between temperature and emission measure derived from X-ray spectra for the peak of solar flares, to temperatures and emission measures characteristic of stellar flares. We find surprisingly good agreement between the parameters derived for stellar flares by various authors, and the extrapolation of the results from the survey of solar flares. C1 SFA INC,LANDOVER,MD 20785. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 15 TC 47 Z9 47 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 1 PY 1995 VL 451 IS 2 BP L79 EP L81 PN 2 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RV627 UT WOS:A1995RV62700010 ER PT J AU DAMODARAN, KV MERZ, KM GABER, BP AF DAMODARAN, KV MERZ, KM GABER, BP TI INTERACTION OF SMALL PEPTIDES WITH LIPID BILAYERS SO BIOPHYSICAL JOURNAL LA English DT Article ID HYDROPHOBIC PEPTIDES; MOLECULAR-DYNAMICS; MEMBRANE-FUSION; ATOMIC CHARGES; BINDING; OLIGOPEPTIDES; SIMULATION; INHIBITION; INTERFACE AB Molecular dynamics simulations of the tripeptide Ala-Phe-Ala-O-tert-butyl interacting with dimyristoylphosphatidylcholine lipid bilayers have been carried out. The lipid and aqueous environments of the peptide, the alkyl chain order, and the lipid and peptide dynamics have been investigated with use of density profiles, radial distribution functions, alkyl chain order parameter profiles, and time correlation functions. It appears that the alkyl chain region accommodates the peptides in the bilayer with minimal perturbation to this region. The peptide dynamics in the bilayer bound form has been compared with that of the free peptide in water. The peptide structure does not vary on the simulation time scale (of the order of hundreds of picoseconds) compared with the solution structure in which a random structure is observed. C1 PENN STATE UNIV,DEPT CHEM,UNIVERSITY PK,PA 16802. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 25 TC 33 Z9 33 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD OCT PY 1995 VL 69 IS 4 BP 1299 EP 1308 PG 10 WC Biophysics SC Biophysics GA TJ021 UT WOS:A1995TJ02100009 PM 8534800 ER PT J AU HIRSCHBERG, PA LIND, RJ BOLDUC, SJ ELSBERRY, RL AF HIRSCHBERG, PA LIND, RJ BOLDUC, SJ ELSBERRY, RL TI THE WEST-COAST PICKET FENCE EXPERIMENT DURING STORM-FEST SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article ID LIMITED-AREA MODEL; PREDICTABILITY AB Mesoscale weather systems that develop in the central United States are often forced by environmental features that have formed far upstream over the conventional data-sparse Pacific Ocean. Although remotely sensed observations, such as satellite retrievals, are becoming more numerous and accurate, they still may not have the resolution necessary to enhance global model-based analyses. and forecasts over this region. These global model products are the primary source of lateral boundary conditions that have been found to have large impacts on the downstream forecast skill of regional mesoscale models over the United States. In addition, the temporal and spatial resolution of the current rawinsonde network along the West Coast may not be sufficient to detect and measure mesoscale flow features as they move inland. During the STORM-FEST experiment in February-March 1992, a ''Picket Fence'' of seven special rawinsonde stations were interspersed among the seven regular rawinsonde sites from Port Hardy, British Columbia, to San Diego, California. All sites obtained observations every 3 h rather than the normal 12 h. The objective of the Picket Fence was to examine the feasibility of using extra observations in time and space to improve upstream boundary conditions for forecasts of mesoscale weather events in the central United States. As a first step in examining the potential boundary condition impact of the Picket Fence, fluxes of mass, heat, momentum, potential energy, kinetic energy, and moisture across the West Coast resolved with various spatial and temporal combinations of Picket Fence data are compared with the 12-h regular upper-air sites as the standard. When a wave system crossed the middle of the Picket Fence, significantly different fluxes were calculated with the full spatial and 3-h Picket Fence observations. For other systems that crossed near the margins of the Picket Fence, only small changes were detected by the additional observations. RP HIRSCHBERG, PA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-HS,589 DYER RD,ROOM 254,MONTEREY,CA 93943, USA. NR 11 TC 2 Z9 3 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD OCT PY 1995 VL 76 IS 10 BP 1741 EP 1757 DI 10.1175/1520-0477(1995)076<1741:TWCPFE>2.0.CO;2 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA TB586 UT WOS:A1995TB58600002 ER PT J AU Murphree, T Reynolds, C AF Murphree, T Reynolds, C TI El Nino and La Nina effects on the northeast Pacific: The 1991-1993 and 1988-1989 events SO CALIFORNIA COOPERATIVE OCEANIC FISHERIES INVESTIGATIONS REPORTS LA English DT Article; Proceedings Paper CT 1994 CalCOFI Symposium - The 1991-92 El Nino and Its Impact on Fisheries CY OCT 25, 1994 CL STANFORD ALUMNI ASSOC SIERRA CAMP CONF CTR, FALLEN LEAF LAKE, CA HO STANFORD ALUMNI ASSOC SIERRA CAMP CONF CTR ID ATMOSPHERE OCEAN INTERACTION; INTERANNUAL VARIABILITY; SOUTHERN OSCILLATION; CIRCULATION; ANOMALIES; AMERICA; TELECONNECTIONS; CALIFORNIA; DYNAMICS; SYSTEM AB The 1991-93 El Nino and 1988-89 La Nina events had substantial effects throughout the tropical Pacific Ocean and atmosphere. These events also greatly affected the extratropics, especially the northeastern Pacific region. A mechanism which appears to have been important in producing these effects was tropical atmospheric forcing of the mid-latitude atmosphere. This process caused shifts in the mid-latitude storm track over the North Pacific. These shifts led to marked changes in the wind forcing of the ocean, which apparently caused substantial ocean anomalies. Evidence for an additional teleconnection mechanism involving ocean Kelvin waves was found in the equatorial Pacific. RP Murphree, T (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MR-ME,MONTEREY,CA 93943, USA. NR 52 TC 24 Z9 25 U1 0 U2 0 PU SCRIPPS INST OCEANOGRAPHY PI LA JOLLA PA A-003, LA JOLLA, CA 92093 SN 0575-3317 J9 CAL COOP OCEAN FISH JI Calif. Coop. Ocean. Fish. Invest. Rep. PD OCT PY 1995 VL 36 BP 45 EP 56 PG 12 WC Fisheries SC Fisheries GA TR428 UT WOS:A1995TR42800005 ER PT J AU QUINTI, I PANDOLFI, F PAGANELLI, R ELSALMAN, D GIOVANNETTI, A ROSSO, R OLIVA, A RAINALDI, L AIUTI, F AF QUINTI, I PANDOLFI, F PAGANELLI, R ELSALMAN, D GIOVANNETTI, A ROSSO, R OLIVA, A RAINALDI, L AIUTI, F TI HCV INFECTION IN PATIENTS WITH PRIMARY DEFECTS OF IMMUNOGLOBULIN PRODUCTION SO CLINICAL AND EXPERIMENTAL IMMUNOLOGY LA English DT Article DE HCV; HYPOGAMMAGLOBULINEMIA; GAMMA-GLOBULINS; HEPATITIS ID HEPATITIS-C VIRUS; NON-B-HEPATITIS; COMMON VARIABLE IMMUNODEFICIENCY; NON-A-HEPATITIS; INTRAVENOUS IMMUNOGLOBULIN; LIVER; ANTIBODY; HYPOGAMMAGLOBULINEMIA; ASSOCIATION; DEFICIENCY AB We tested for infection with hepatitis C virus (HCV) in 58 patients affected by humoral immunodeficiencies: 43 common variable immunodeficiency (CVI), two hyper IgM syndrome (HIM), two IgG subclass deficiency, four ataxia-telangiectasia (AT), and seven X-linked agamma-globulinaemia (XLA). While the assessment of serum specific HCV antibodies in some of these patients was not informative because of the impairment in specific antibody production, the reverse transcriptase polymerase chain reaction (RT-PCR) assay used to detect serum HCV RNA was a useful method for diagnosing infection. We found that 38% of late onset hypogammaglobulinaemic patients (CVI, HIM or IgG subclass deficiency) had evidence of HCV infection. HCV infection was not detectable in patients with XLA or AT. The majority of our patients had persistent viraemia, and those who underwent liver biopsy showed histological findings of chronic hepatitis. Moreover, we could demonstrate in vitro that eight of Is HCV-infected patients were actively producing anti-HCV antibodies, despite their impaired antibody production. The high rate of HCV infection in hypogammaglobulinaemic patients could be related to several nosocomial routes of transmission, including intravenous immune globulin administration. Despite the persistent viremia only two patients had cirrhosis and none had hepatocarcinoma. C1 CATHOLIC UNIV ROME,CHAIR SEMEIOT & METODOL MED,ROME,ITALY. USN,DIV VIROL,MED RES UNIT 3,CAIRO,EGYPT. RP QUINTI, I (reprint author), UNIV ROMA LA SAPIENZA,DEPT ALLERGY & CLIN IMMUNOL,VIALE UNIV 37,I-00185 ROME,ITALY. RI Giovannetti, Antonello/E-7736-2012 NR 30 TC 25 Z9 27 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0009-9104 J9 CLIN EXP IMMUNOL JI Clin. Exp. Immunol. PD OCT PY 1995 VL 102 IS 1 BP 11 EP 16 PG 6 WC Immunology SC Immunology GA RY735 UT WOS:A1995RY73500003 PM 7554376 ER PT J AU SHAHEEN, HI GIRGIS, NI RODIER, GR KAMAL, KA AF SHAHEEN, HI GIRGIS, NI RODIER, GR KAMAL, KA TI EVALUATION OF THE RESPONSE OF HUMAN HUMORAL ANTIBODIES TO SALMONELLA-TYPHI LIPOPOLYSACCHARIDE IN AN AREA OF ENDEMIC TYPHOID-FEVER SO CLINICAL INFECTIOUS DISEASES LA English DT Note ID LINKED-IMMUNOSORBENT-ASSAY; WIDAL TEST; DIAGNOSTIC-VALUE; ANTIGEN; BLOOD AB Because of the limited value of Widal's test in the diagnosis of typhoid fever in areas of endemicity, individual serum levels of IgM, IgA, IgG, and IgG subclass antibodies to Salmonella typhi lipopolysaccharide were evaluated in samples collected in Egypt. The study involved 106 febrile patients, including 40 patients for whom cultures were positive for S. typhi and 66 patients for whom diseases other than typhoid were diagnosed. Multivariate regression modeling revealed that detection of the combination of IgA, IgG, and IgG2 correlated best, although not perfectly (adjusted r(2) = .68), with a positive culture; the sensitivity and specificity of testing for IgA, IgG, and IgG2 (i.e,, all three tests positive vs. all three tests negative) were 91.7% and 98.1%, respectively. These results suggested that testing for IgA, IgG, and IgG2 in combination is of diagnostic value for S. typhi infection. C1 USN,DIV APPL SCI,MED RES UNIT 3,FPO,AE 09835. UNIV MARYLAND,INT HLTH PROGRAM,BALTIMORE,MD 21201. RP SHAHEEN, HI (reprint author), USN,DIV BASIC SCI,MED RES UNIT 3,PSC 452,BOX 5000,FPO,AE 09835, USA. NR 14 TC 12 Z9 12 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD OCT PY 1995 VL 21 IS 4 BP 1012 EP 1013 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA RZ139 UT WOS:A1995RZ13900033 PM 8645789 ER PT J AU TRIBBLE, D GIRGIS, N HABIB, N BUTLER, T AF TRIBBLE, D GIRGIS, N HABIB, N BUTLER, T TI EFFICACY OF AZITHROMYCIN FOR TYPHOID-FEVER SO CLINICAL INFECTIOUS DISEASES LA English DT Note ID INFECTION C1 USN,MED RES UNIT 3,CAIRO,EGYPT. TEXAS TECH UNIV,HLTH SCI CTR,LUBBOCK,TX 79430. NR 8 TC 18 Z9 18 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD OCT PY 1995 VL 21 IS 4 BP 1045 EP 1046 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA RZ139 UT WOS:A1995RZ13900049 PM 8645805 ER PT J AU LEWIS, T AF LEWIS, T TI BINARY CRITIC CRITICIZED - REPLY SO COMPUTER LA English DT Letter RP LEWIS, T (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 0 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 SN 0018-9162 J9 COMPUTER JI Computer PD OCT PY 1995 VL 28 IS 10 BP 6 EP 6 DI 10.1109/2.471166 PG 1 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA RY333 UT WOS:A1995RY33300005 ER PT J AU LEWIS, T AF LEWIS, T TI LIVING IN REAL-TIME, SIDE-B - (WHERE WILL THE BRAIN POWER COME FROM) SO COMPUTER LA English DT Article RP LEWIS, T (reprint author), USN,POSTGRAD SCH,CODE CS,MONTEREY,CA 93943, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD OCT PY 1995 VL 28 IS 10 BP 8 EP 10 DI 10.1109/2.410133 PG 3 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA RY333 UT WOS:A1995RY33300006 ER PT J AU NGUYEN, B KEANE, MM JOHNSTON, PG AF NGUYEN, B KEANE, MM JOHNSTON, PG TI THE BIOLOGY OF GROWTH-REGULATION IN NORMAL AND MALIGNANT BREAST EPITHELIUM - FROM BENCH TO CLINIC SO CRITICAL REVIEWS IN ONCOLOGY/HEMATOLOGY LA English DT Review ID MOUSE MAMMARY-GLAND; FACTOR-BINDING-PROTEINS; FACTOR-I RECEPTORS; MESSENGER RIBONUCLEIC-ACID; CANCER-CELLS INVITRO; RESTING HUMAN-BREAST; TUMOR EFFECTS INVIVO; TERM TISSUE-CULTURE; C-MYC AMPLIFICATION; HER-2 NEU ONCOGENE C1 USN,NCI,MED ONCOL BRANCH,DIV CANC TREATMENT,BETHESDA,MD. NR 168 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE PUBL CO INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1040-8428 J9 CRIT REV ONCOL HEMAT JI Crit. Rev. Oncol./Hematol. PD OCT PY 1995 VL 20 IS 3 BP 223 EP 236 PG 14 WC Oncology; Hematology SC Oncology; Hematology GA TJ541 UT WOS:A1995TJ54100003 PM 8748011 ER PT J AU SINKOVITS, RS DEVORE, CR SHAMAMIAN, VA WESTBROOK, CK AF SINKOVITS, RS DEVORE, CR SHAMAMIAN, VA WESTBROOK, CK TI AN ANALYSIS OF GAS-PHASE ETHANOL-WATER CHEMISTRY FOR DIAMOND CVD SO DIAMOND AND RELATED MATERIALS LA English DT Article DE DIAMOND; CHEMICAL KINETICS; CHEMICAL VAPOR DEPOSITION; ETHANOL-WATER ID CHEMICAL-VAPOR-DEPOSITION; HYDROGEN; GROWTH; MIXTURE; SURFACE; OXYGEN; FLAMES AB Chemical kinetics calculations were carried out on ethanol (EtOH)-water mixtures at a range of temperatures, pressures and EtOH-to-H2O ratios. The results show that the mole fractions of many chemical species depend very sensitively on the initial EtOH-to-H2O ratio and diverge sharply after an induction time which depends on both pressure and temperature. We explain this divergence primarily in terms of the stability of carbon monoxide and show that the rate-limiting steps that dictate the induction time are the molecular hydrogen dissociation reactions. Our calculations also predict the dependence of the concentrations of potential growth (C, CH3, C2H2) and etching (O, OH, O-2) species for diamond CVD on operating conditions. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SINKOVITS, RS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI DeVore, C/A-6067-2015 OI DeVore, C/0000-0002-4668-591X NR 27 TC 2 Z9 2 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD OCT PY 1995 VL 4 IS 11 BP 1277 EP 1288 DI 10.1016/0925-9635(95)00304-5 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA TJ750 UT WOS:A1995TJ75000007 ER PT J AU CHANG, LW AF CHANG, LW TI DYNAMICS OF A VERSATILE SLIDING CONTROL SO DYNAMICS AND CONTROL LA English DT Article ID NON-LINEAR SYSTEMS; VARIABLE STRUCTURE CONTROL; ROBOT MANIPULATORS; DESIGN AB The dynamics of a versatile sliding control is presented, which utilizes a low-pass filter for second-order s dynamics and a high-pass (or band-pass) filter for an error dynamics in series. The versatile sliding control places zeros within the error dynamics and applies a second-order sliding condition. The second-order s dynamics sharply rejects unwanted high-frequency signals that include unmodeled dynamics and disturbances. The bandwidth of the s dynamics is designed low such that the excitation to the error dynamics will be minimum. With a lower bound of damping ratio for the s dynamics, the thickness of the boundary layer can be self-tuned by the placed zeros and the spring constant within the sliding condition to fine tune the s dynamics and the error dynamics. The trade-off between tracking accuracy and the robustness to the uncertainties no longer exists. The control exhibits greater flexibility in design and better performance than its counterpart with a first-order sliding condition. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP CHANG, LW (reprint author), NATL TAIWAN UNIV,COLL MED,CTR BIOMED ENGN,TAIPEI 10764,TAIWAN. NR 12 TC 0 Z9 0 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0925-4668 J9 DYNAM CONTROL JI Dynam. Control PD OCT PY 1995 VL 5 IS 4 BP 347 EP 363 DI 10.1007/BF01968502 PG 17 WC Automation & Control Systems; Engineering, Mechanical SC Automation & Control Systems; Engineering GA RY523 UT WOS:A1995RY52300002 ER PT J AU STALLWORTH, PE GREENBAUM, SG CROCE, F SLANE, S SALOMON, M AF STALLWORTH, PE GREENBAUM, SG CROCE, F SLANE, S SALOMON, M TI LI-7 NMR AND IONIC-CONDUCTIVITY STUDIES OF GEL ELECTROLYTES BASED ON POLY(METHYLMETHACRYLATE) SO ELECTROCHIMICA ACTA LA English DT Article; Proceedings Paper CT 5th International Symposium on Polymer Electrolytes (ISPE4) CY JUN 21-25, 1994 CL NEWPORT, RI SP Ciba Geigy Japan Ltd, Cyprus Foote Mineral Co, Dai Ichi Kogyo Seiyaku Co Ltd, Duracell Int Inc, Ever Ready Battery Co Inc, USN, Off Naval Res, Yuasa Corp DE ELECTROLYTE; PMMA; LI-7 NMR; IONIC CONDUCTIVITY ID POLYMER AB Gel electrolytes synthesized from poly(methylmethacrylate), ethylene carbonate, propylene carbonate and various lithium salts [LiClO4, LiAsF6, or LiN(CF3SO2)(2)] have been investigated by differential scanning calorimetry, electrical conductivity, and Li-7, F-19 and As-75 NMR spectroscopy. Although the ionic conductivities of the gels approach those of liquid electrolytes above room temperature, the NMR results indicate that the immediate environments of both the cations and anions differ significantly in the gel and in the liquid. Thus the presence of microscopic regions of pure liquid electrolyte in the gel can be ruled out. C1 UNIV ROME,DEPT CHEM,ROME,ITALY. USA,EPSD,RES LAB,FT MONMOUTH,NJ 07703. USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP STALLWORTH, PE (reprint author), CUNY HUNTER COLL,DEPT PHYS,NEW YORK,NY 10021, USA. RI Croce, Fausto/J-8193-2012 NR 10 TC 71 Z9 72 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD OCT PY 1995 VL 40 IS 13-14 BP 2137 EP 2141 DI 10.1016/0013-4686(95)00153-6 PG 5 WC Electrochemistry SC Electrochemistry GA RU089 UT WOS:A1995RU08900017 ER PT J AU FONTANELLA, JJ WINTERSGILL, MC CHEN, RS WU, Y GREENBAUM, SG AF FONTANELLA, JJ WINTERSGILL, MC CHEN, RS WU, Y GREENBAUM, SG TI CHARGE-TRANSPORT AND WATER MOLECULAR-MOTION IN VARIABLE MOLECULAR-WEIGHT NAFION MEMBRANES - HIGH-PRESSURE ELECTRICAL-CONDUCTIVITY AND NMR SO ELECTROCHIMICA ACTA LA English DT Article; Proceedings Paper CT 5th International Symposium on Polymer Electrolytes (ISPE4) CY JUN 21-25, 1994 CL NEWPORT, RI SP Ciba Geigy Japan Ltd, Cyprus Foote Mineral Co, Dai Ichi Kogyo Seiyaku Co Ltd, Duracell Int Inc, Ever Ready Battery Co Inc, USN, Off Naval Res, Yuasa Corp DE NAFION; ELECTRICAL CONDUCTIVITY; NUCLEAR MAGNETIC RESONANCE; TRANSPORT MECHANISM; ACTIVATION VOLUME; HIGH PRESSURE ID DIELECTRIC-RELAXATION AB Measurements of the electrical conductivity and deuteron NMR spin-lattice relaxation times (T-1) in three different molecular weights of acid form NAFION conditioned at various levels of relative humidity have been carried out. Complex impedance studies were made along the plane of the film at frequencies from 10-10(8) Hz at room temperature and pressures up to 0.3 GPa. The high pressure electrical data were only obtained for water contents less than 8 wt%. The NMR measurements were also made at room temperature and pressures up to 0.25GPa. The NMR data are primarily for water contents greater than 6wt%. The calculated activation volume exhibits a large decrease (from 16 to 3 cm(3)/mol) as the water content is increased from 2.4-8 wt%. In addition, the activation volumes are larger and the electrical conductivity is smaller for the higher molecular weight material. These results represent further evidence that the transport mechanism in low water content materials is dominated by segmental motions of the polymer chain and that proton transport and water molecular rotation are correlated. The activation volumes extracted from the NMR data show only a small further decrease as the water content is increased from 6-22 wt%. Possible explanations for the high water content NMR pressure results are given. C1 CUNY HUNTER COLL,NEW YORK,NY 10021. RP FONTANELLA, JJ (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 16 TC 54 Z9 54 U1 0 U2 12 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD OCT PY 1995 VL 40 IS 13-14 BP 2321 EP 2326 DI 10.1016/0013-4686(95)00186-I PG 6 WC Electrochemistry SC Electrochemistry GA RU089 UT WOS:A1995RU08900049 ER PT J AU LEE, HS YANG, XQ MCBREEN, J OKAMOTO, Y CHOI, LS AF LEE, HS YANG, XQ MCBREEN, J OKAMOTO, Y CHOI, LS TI A NEW FAMILY OF ANION RECEPTORS AND THEIR EFFECT ON ION-PAIR DISSOCIATION AND CONDUCTIVITY OF LITHIUM-SALTS IN NONAQUEOUS SOLUTIONS SO ELECTROCHIMICA ACTA LA English DT Article; Proceedings Paper CT 5th International Symposium on Polymer Electrolytes (ISPE4) CY JUN 21-25, 1994 CL NEWPORT, RI SP Ciba Geigy Japan Ltd, Cyprus Foote Mineral Co, Dai Ichi Kogyo Seiyaku Co Ltd, Duracell Int Inc, Ever Ready Battery Co Inc, USN, Off Naval Res, Yuasa Corp DE ANION RECEPTORS; ANION COMPLEXES; ELECTROLYTES; X-RAY ABSORPTION ID X-RAY-ABSORPTION; COMPLEXES AB A new family of anion receptors based on aza-ether compounds have been synthesized. Since the anion complexation of these compounds is not based on either positively charged sites or hydrogen bonding, they have a potential to be used in lithium batteries as electrolyte additives. When these compounds are added to non-aqueous electrolytes with lithium salts, such as LiCl/THF or LiBr/THF, the ionic conductivity can be dramatically increased. Near edge X-ray absorption fine structure (NEXAFS) spectroscopy studies show that Cl- anions are complexed with the nitrogen groups in these compounds. The increase in ionic conductivity and the degree of complexation, are both related to the number of R = CF3SO2 groups that are used to substitute the amine hydrogen atoms in these aza-ether compounds. C1 POLYTECH UNIV,NEW YORK,NY 11201. USN,RES LAB,WASHINGTON,DC 20375. RP LEE, HS (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 8 TC 16 Z9 16 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD OCT PY 1995 VL 40 IS 13-14 BP 2353 EP 2356 DI 10.1016/0013-4686(95)00192-H PG 4 WC Electrochemistry SC Electrochemistry GA RU089 UT WOS:A1995RU08900055 ER PT J AU MITCHELL, PB GIORDANO, M CANNONSPOOR, HE OKOYE, GS GELLER, HM FREED, WJ AF MITCHELL, PB GIORDANO, M CANNONSPOOR, HE OKOYE, GS GELLER, HM FREED, WJ TI CHARACTERIZATION OF THE HOST RESPONSE TO TRANSPLANTS OF THE IMMORTALIZED A7 GLIAL-CELL LINE IN THE RAT STRIATUM SO EXPERIMENTAL NEUROLOGY LA English DT Meeting Abstract C1 USN HOSP,DEPT NEUROSURG,BETHESDA,MD 20814. UNIV NACL AUTONOMA MEXICO,MEXICO CITY,DF,MEXICO. NIMH,NEUROSCI CTR ST ELIZABETHS,NPB,PRECLIN NEUROSCI SECT,WASHINGTON,DC 20032. UNIV MED & DENT NEW JERSEY,ROBERT WOOD JOHNSON MED SCH,NEWARK,NJ 07103. NR 3 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0014-4886 J9 EXP NEUROL JI Exp. Neurol. PD OCT PY 1995 VL 135 IS 2 BP 168 EP 168 PG 1 WC Neurosciences SC Neurosciences & Neurology GA TC202 UT WOS:A1995TC20200053 ER PT J AU FRANCE, R YAN, N OLESIUK, P NERO, R DELGIORGIO, PA KELLER, W AF FRANCE, R YAN, N OLESIUK, P NERO, R DELGIORGIO, PA KELLER, W TI SECONDARY ANALYSIS OF RELATIONSHIPS BETWEEN PELAGIC INVERTEBRATE PREDATORS AND PHYTOPLANKTON ABUNDANCE AND WATER CLARITY SO FRESHWATER BIOLOGY LA English DT Article ID ZOOPLANKTON COMMUNITY STRUCTURE; EXPERIMENTAL LAKES AREA; FOOD WEB STRUCTURE; MYSIS-RELICTA; CRUSTACEAN ZOOPLANKTON; NORTHWESTERN ONTARIO; PRIMARY PRODUCTIVITY; CHAOBORUS-FLAVICANS; NEOMYSIS-MERCEDIS; ADIRONDACK LAKES AB 1. Several models predict that elevated levels of zooplanktivory will promote increases in phytoplankton abundance and corresponding decreases in water clarity. Because estimates of zooplanktivorous fish abundance are logistically difficult, empirical testing of these models has been limited. Our goal was to examine whether the impact of mysids and larval chaoborids on their herbivorous zooplankton prey is either transmitted to, or becomes uncoupled at, the phytoplankton and water quality levels. 2. A secondary analysis of ninety-eight correlation coefficients from twenty-five published and unpublished data sets indicated that on average 71% of all correlations agreed with the predictions of top-down trophic interactions, although most did so with only marginal or weak support. 3. Potential confounding by variable nutrient concentrations, alternative determinants of water clarity and omnivory may complicate simple interpretation of the influence of pelagic invertebrates on zooplankton in lakes. C1 ONTARIO MINIST ENVIRONM & ENERGY,DORSET,ON P0A 1E0,CANADA. FISHERIES & OCEANS CANADA,DIV MARINE MAMMAL,PACIFIC BIOL STN,NANAIMO,BC V9R 5K6,CANADA. USN,RES LAB,BAY ST LOUIS,MS 39529. UNIV QUEBEC,DEPT SCI BIOL,MONTREAL,PQ H3C 3P8,CANADA. ONTARIO MINIST ENVIRONM & ENERGY,SUDBURY,ON P3E 5P9,CANADA. RP FRANCE, R (reprint author), MCGILL UNIV,DEPT BIOL,1205 AVE DR PENFIELD,MONTREAL,PQ H3A 1B1,CANADA. RI Yan, Norman/H-5235-2013; Keller, Wendel/G-1533-2012; OI Yan, Norman/0000-0003-4870-6865 NR 71 TC 3 Z9 3 U1 2 U2 4 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0046-5070 J9 FRESHWATER BIOL JI Freshw. Biol. PD OCT PY 1995 VL 34 IS 2 BP 255 EP 261 DI 10.1111/j.1365-2427.1995.tb00885.x PG 7 WC Marine & Freshwater Biology SC Marine & Freshwater Biology GA TA714 UT WOS:A1995TA71400005 ER PT J AU SMOOT, NC AF SMOOT, NC TI MASS-WASTING AND SUBAERIAL WEATHERING IN GUYOT FORMATION - THE HAWAIIAN AND CANARY RIDGES AS EXAMPLES SO GEOMORPHOLOGY LA English DT Article ID ISLANDS; BATHYMETRY; TENERIFE; PACIFIC AB By using a combination of bathymetry and topography in the computerized GRASS 3D package, guyot evolution has been determined on the fast-moving Pacific plate for the subaerial, low sloped Hawaiian Island chain. On the slow-moving African plate, the timing of guyot formation has been determined for the subaerial, steeper sloped Canary Islands chain. In the Hawaiian chain, the Niihau Island platform was already essentially formed, although there is a platform at the 180 m elevation on Kauai Island if the remaining peaks are discounted. By Fuerteventura Island in the Canary chain the seamount/island has already been flattened. Both of these platforms are far above the influence of wave cutting. The causal agent of flattening is primarily mass wasting by landsliding, caused in part by earthquake activity on the moving plates. This disproves the subsidence and wavecut theory of guyot formational processes in that the guyot is already formed before it subsides. The islands lie in the tropical coral zone, yet coral formation has little effect on the flattening process. This may be because the turbidity from slumps kills the coral. This exercise also gives a time limit for the reduction of pristine volcanic slopes to the typical guyot surface, that time being between one and four million years. It is apparent that wave cutting merely polishes the stone, applying the finishing patina. RP SMOOT, NC (reprint author), USN,OCEANOG OFF,DIV SEAFLOOR DATA BASES,BAY ST LOUIS,MS 39522, USA. NR 27 TC 8 Z9 8 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-555X J9 GEOMORPHOLOGY JI Geomorphology PD OCT PY 1995 VL 14 IS 1 BP 29 EP 41 PG 13 WC Geography, Physical; Geosciences, Multidisciplinary SC Physical Geography; Geology GA TB397 UT WOS:A1995TB39700003 ER PT J AU HACKETT, TE OLT, G SOROSKY, JI PODCZASKI, E HARRISON, TA MORTEL, R AF HACKETT, TE OLT, G SOROSKY, JI PODCZASKI, E HARRISON, TA MORTEL, R TI SURGICAL PREDICTORS OF PARAAORTIC METASTASES IN EARLY-STAGE CERVICAL-CARCINOMA SO GYNECOLOGIC ONCOLOGY LA English DT Article; Proceedings Paper CT 26th Annual Meeting of the Society-of-Gynecologic-Oncologists CY FEB 19-22, 1995 CL SAN FRANCISCO, CA SP Soc Gynecol Oncologists ID GYNECOLOGIC ONCOLOGY GROUP; RADICAL HYSTERECTOMY; NODE METASTASIS; CANCER; LYMPHADENECTOMY; EXPERIENCE; MANAGEMENT AB Radical pelvic surgery for cervical carcinoma is contraindicated in the presence of para-aortic node metastases. However, the incidence of para-aortic nodal involvement is very low in early-stage disease, Therefore, it may not be necessary to subject all patients to para-aortic lymphadenectomy prior to radical hysterectomy, Medical records for 408 patients with early-stage cervical carcinoma treated at the Pennsylvania State University-M, S. Hershey Medical Center were reviewed to ascertain if clinical factors can be utilized intraoperatively to accurately predict those patients at minimal risk for para-aortic lymph node metastases, The presence of clinically suspicious (abnormally enlarged or firm) pelvic or para-aortic lymph nodes or extracervical spread of tumor at the time of exploration were significant predictors of para-aortic metastases (P < 0.001). The majority of patients (85%) had none of these risk factors, and no patient had para-aortic metatases in the absence of these predictors. Suspicious pelvic or para-aortic lymph nodes were present in the minority of patients (15%) and identified all patients with para-aortic metastases. Therefore, paraaortic lymphadenectomy may be safely omitted at the time of exploration for radical hysterectomy in the absence of enlarged or abnormally firm pelvic or para-aortic lymph nodes, In the presence of either of these factors or extracervical spread of disease a paraaortic lymphadenectomy is necessary to rule out metastases. (C) 1995 Academic Press, Inc. C1 PENN STATE UNIV HOSP,DEPT OBSTET & GYNECOL,DIV GYNECOL ONCOL,HERSHEY,PA 17033. RP HACKETT, TE (reprint author), USN,MED CTR,DEPT OBSTET & GYNECOL,DIV GYNECOL ONCOL,SAN DIEGO,CA 92129, USA. NR 18 TC 15 Z9 15 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0090-8258 J9 GYNECOL ONCOL JI Gynecol. Oncol. PD OCT PY 1995 VL 59 IS 1 BP 15 EP 19 DI 10.1006/gyno.1995.1261 PG 5 WC Oncology; Obstetrics & Gynecology SC Oncology; Obstetrics & Gynecology GA RX624 UT WOS:A1995RX62400004 PM 7557602 ER PT J AU KIM, JP LINNEN, J WAGES, J SHIH, J NAKATSUJI, Y FRY, K ZHANGKECK, ZY YOUNG, L GALLAGHER, P KRAWCZYNSKI, K ISMAY, S HYAMS, C LIFSON, J ALTER, M MARGOLIS, H FOUNG, S BRADLEY, D ALTER, H AF KIM, JP LINNEN, J WAGES, J SHIH, J NAKATSUJI, Y FRY, K ZHANGKECK, ZY YOUNG, L GALLAGHER, P KRAWCZYNSKI, K ISMAY, S HYAMS, C LIFSON, J ALTER, M MARGOLIS, H FOUNG, S BRADLEY, D ALTER, H TI IDENTIFICATION OF A NEW HEPATITIS-VIRUS (HGV) AND ITS IMPLICATION IN POST TRANSFUSION HEPATITIS SO HEPATOLOGY LA English DT Meeting Abstract C1 GENELABS TECHNOL INC,REDWOOD CITY,CA. NIH,BETHESDA,MD 20892. CTR DIS CONTROL & PREVENT,ATLANTA,GA 30341. NSW BLOOD TRANSFUS SERV,SYDNEY,NSW,AUSTRALIA. USN,MED RES INST,WASHINGTON,DC. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0270-9139 J9 HEPATOLOGY JI Hepatology PD OCT PY 1995 VL 22 IS 4 SU S BP 447 EP 447 PN 2 PG 1 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA RX690 UT WOS:A1995RX69000445 ER PT J AU PAWLAK, RJ BEEX, AA AF PAWLAK, RJ BEEX, AA TI FUSION TECHNIQUE FOR MULTISENSOR TRACK INITIATION SO IEE PROCEEDINGS-RADAR SONAR AND NAVIGATION LA English DT Article DE SENSOR FUSION TECHNIQUES; MULTISENSOR TRACK INITIATION ID SYSTEMS AB A multisensor track-initiation algorithm is proposed. The algorithm marries conventional gating approaches with log-likelihood-ratio test based data fusion methods and effectively deals with the missing measurement problem. The application of the proposed method to the low-elevation track initiation problem using shipboard radar and infrared sensors is discussed. Simulation results are presented that compare the performance of the proposed algorithm with that of the AND algorithm. C1 VIRGINIA POLYTECH INST & STATE UNIV,BRADLEY DEPT ELECT ENGN,BLACKSBURG,VA 24061. RP PAWLAK, RJ (reprint author), USN,CTR SURFACE WARFARE,SENSORS INTEGRAT BRANCH,CODE F41,DAHLGREN,VA 22448, USA. NR 12 TC 1 Z9 3 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 1350-2395 J9 IEE P-RADAR SON NAV JI IEE Proc.-Radar Sonar Navig. PD OCT PY 1995 VL 142 IS 5 BP 225 EP 231 DI 10.1049/ip-rsn:19952080 PG 7 WC Telecommunications SC Telecommunications GA TC096 UT WOS:A1995TC09600003 ER PT J AU FARGUES, MP BROOKS, WA AF FARGUES, MP BROOKS, WA TI COMPARATIVE-STUDY OF TIME-FREQUENCY AND TIME-SCALE TRANSFORMS FOR ULTRA-WIDE-BAND RADAR TRANSIENT SIGNAL-DETECTION SO IEE PROCEEDINGS-RADAR SONAR AND NAVIGATION LA English DT Article DE INSTANTANEOUS POWER SPECTRUM; SPECTROGRAM; ULTRA-WIDE-BAND RADARS; WIGNER-VILLE DISTRIBUTION AB The application of various time-frequency and time-scale transformations to the detection of raw ultra-wideband radar returns in the presence of strong RFI is investigated. The A-trous implementation of the continuous wavelet transform is best matched to the signals considered as the return is most consistently localised in the scalogram. C1 USN,SEA SYST COMMAND,ARLINGTON,VA 22246. RP FARGUES, MP (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93933, USA. NR 22 TC 2 Z9 2 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 1350-2395 J9 IEE P-RADAR SON NAV JI IEE Proc.-Radar Sonar Navig. PD OCT PY 1995 VL 142 IS 5 BP 236 EP 242 DI 10.1049/ip-rsn:19952075 PG 7 WC Telecommunications SC Telecommunications GA TC096 UT WOS:A1995TC09600005 ER PT J AU SKOLNIK, M ANDREWS, G HANSEN, JP AF SKOLNIK, M ANDREWS, G HANSEN, JP TI ULTRAWIDEBAND MICROWAVE-RADAR CONCEPTUAL DESIGN SO IEEE AEROSPACE AND ELECTRONIC SYSTEMS MAGAZINE LA English DT Article AB This paper outlines the special considerations that characterize the design of an UWB radar for the detection of low-altitude missiles over the sea. It discusses the factors which enter into the choice of frequency, and the selection of the transmitter, antenna, and receiver. Reviewed are signal processing issues concerning detection of UWB signals in noise and clutter, nondoppler MTI based on the pulse-to-pulse change in range due to target motion, measurement of target height based on multipath time delay, and target recognition. As the investigation progressed, the authors became disappointed with the available UWB technology, but encouraged about the potential advantages of UWB for this application. The chief limitation of UWB radar that must be overcome before applications are viable is its poor electromagnetic compatibility (EMC). RP SKOLNIK, M (reprint author), USN,RES LAB,DIV RADAR,WASHINGTON,DC 20375, USA. NR 8 TC 9 Z9 10 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8985 J9 IEEE AERO EL SYS MAG JI IEEE Aerosp. Electron. Syst. Mag. PD OCT PY 1995 VL 10 IS 10 BP 25 EP 30 DI 10.1109/62.469795 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA TB405 UT WOS:A1995TB40500008 ER PT J AU ALLEN, RT ARKIN, SE LAWRENCE, RE AF ALLEN, RT ARKIN, SE LAWRENCE, RE TI MOVING NAVAL (CI)-I-4 INTO THE NEXT CENTURY SO IEEE COMMUNICATIONS MAGAZINE LA English DT Article AB The Naval (CI)-I-4 initiative is defining a future architecture that is based on information management with one objective in mind: to bring Naval (CI)-I-4 to the next level of integration and interoperability in the joint war fighting arena for the advantages it brings to the warrior. C1 MITRE CORP,DIV NAVY SYST & TECHNOL,MCLEAN,VA. RP ALLEN, RT (reprint author), USN,SPAWAR,C4I SYST DIRECTORATE,PD 70,ARLINGTON,VA 22217, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0163-6804 J9 IEEE COMMUN MAG JI IEEE Commun. Mag. PD OCT PY 1995 VL 33 IS 10 BP 96 EP 105 DI 10.1109/35.466227 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA RY892 UT WOS:A1995RY89200012 ER PT J AU HEALEY, AJ AF HEALEY, AJ TI UNTITLED SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Editorial Material RP HEALEY, AJ (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1995 VL 20 IS 4 BP 255 EP 257 PG 3 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA RZ860 UT WOS:A1995RZ86000001 ER PT J AU GAUNAURD, GC HUANG, HS AF GAUNAURD, GC HUANG, HS TI ACOUSTIC SCATTERING BY AN AIR-BUBBLE NEAR THE SEA-SURFACE SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article AB Sound scattering by an air bubble in a boundless fluid is an old classical problem [19], If the air bubble is near and strongly interacting, with the (flat) surface of a liquid half-space, then the scattering cross section (SCS) of the bubble differs substantially from its value far-away from the interface, We present the exact solution for this scattering Problem which is valid for any incidence direction of the (plane) sound waves, and for any bubble depth, obtained by the general method of images. The bubble is no longer assumed to be a point, simple, harmonic, radially pulsating oscillator, but it is described as a continuous, spatially extended body, having an infinity of modes and resonances, The interaction with the boundary, or the image is not treated by means of the simple Lloyd's mirror formula for point sources (or scatterers), but by a general, extended continuum approach, This benchmark solution makes use of the addition theorems for the spherical wavefunctions. The resulting SCS contains contributions from the bubble, its image, the incident wave, and the reflected wave from the boundary, It is expressed in terms of coupling coefficients, b(mn), which contain products of Wigner-3j symbols, The formulation is illustrated with many computed plots for bubbles at various depths, and the results compare favorably with earlier experimental observations, The approach also serves to describe scattering by fish near the sea surface, in an exact fashion, Acoustic scattering by near-surface bubbles also has many other applications such as in the improvement of the performance of sensors that must operate through bubbly media, and in the understanding of its connection with approaches to model oceanic fluxes. C1 USN,CTR SURFACE WARFARE,INDIAN HEAD DIV,SILVER SPRING,MD 20903. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,SILVER SPRING,MD 20903, USA. NR 22 TC 26 Z9 26 U1 2 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1995 VL 20 IS 4 BP 285 EP 292 DI 10.1109/48.468243 PG 8 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA RZ860 UT WOS:A1995RZ86000005 ER PT J AU CAREY, WM DOUTT, J EVANS, RB DILLMAN, LM AF CAREY, WM DOUTT, J EVANS, RB DILLMAN, LM TI SHALLOW-WATER SOUND-TRANSMISSION MEASUREMENTS ON THE NEW-JERSEY CONTINENTAL-SHELF SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID HANKEL TRANSFORM; SEA-FLOOR; PROPAGATION; ATTENUATION; FREQUENCY; BOTTOM; SPEED; OCEAN AB Calibrated acoustic measurements were made under calm sea state conditions on the New Jersey shelf near the AMCOR 6010 borehole, a surveyed area with known geophysical properties. The experiment was conducted in 73 m water with supporting measurements of salinity, temperature, and sound speed, Acoustic measurements were obtained with a vertical array of 24 hydrophones spaced equally at 2.5m intervals; one of which was near the bottom, A source towed at 1/2 the water depth transmitted one of two sets of four tones spaced between 50 and 600 Hz for each run to ranges of 4 and 26 km, The data were processed with both a Hankel transform and a high resolution Doppler technique to yield horizontal wave-number spectrum at several depths. Results were obtained along both constant and gradually varying depth profiles, Similar modal interference patterns were observed at the lower frequencies, The constant depth-profile radial results were compared to calculations performed with several shallow water acoustic models using geoacoustic profiles derived from geophysical parameters and shear wave inversion methods, Calculated and measured sound transmission results were found to agree. C1 WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. SCI APPLICAT INT CORP,NEW LONDON,CT 06320. USN,CTR UNDERSEA WARFARE,DIV ENVIRONM & UNDERWATER ACOUST,NEW LONDON,CT 06320. RP CAREY, WM (reprint author), ADV RES PROJECTS AGCY,OLD LYME,CT 06371, USA. NR 49 TC 61 Z9 61 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1995 VL 20 IS 4 BP 321 EP 336 DI 10.1109/48.468247 PG 16 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA RZ860 UT WOS:A1995RZ86000009 ER PT J AU HEALEY, AJ ROCK, SM CODY, S MILES, D BROWN, JP AF HEALEY, AJ ROCK, SM CODY, S MILES, D BROWN, JP TI TOWARD AN IMPROVED UNDERSTANDING OF THRUSTER DYNAMICS FOR UNDERWATER VEHICLES SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Note AB This paper proposes a novel approach to modeling the four quadrant dynamic response of thrusters as used for the motion control of ROV and AW underwater vehicles. The significance is that these vehicles are small. in size and respond quickly to commands. Precision in motion control will require further understanding of thruster performance than is currently available. The model includes a four quadrant mapping of the propeller blades lift and drag forces and is coupled with motor and fluid system dynamics. A series of experiments is described for both long and short period triangular, as wed as square wave inputs. The model is compared favorably with experimental data for a variety of differing conditions and predicts that force overshoots are observed under conditions of rapid command changes. Use of the model will improve the control of dynamic thrust on these vehicles. C1 STANFORD UNIV,AEROSP ROBOT LAB,STANFORD,CA 94305. RP HEALEY, AJ (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 14 TC 86 Z9 87 U1 1 U2 14 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1995 VL 20 IS 4 BP 354 EP 361 DI 10.1109/48.468252 PG 8 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA RZ860 UT WOS:A1995RZ86000013 ER PT J AU FRANKEL, MY ESMAN, RD PARENT, MG AF FRANKEL, MY ESMAN, RD PARENT, MG TI ARRAY TRANSMITTER/RECEIVER CONTROLLED BY A TRUE TIME-DELAY FIBEROPTIC BEAMFORMER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID ANTENNAS AB We demonstrate a phased-array antenna controlled by a fiber-optic beamformer in true tine-delayed transmit mode and in phase-delayed receive mode. The wavelength-tunable optical carrier propagating in a high-dispersion fiber realizes a true time-delay, with the steering direction set by a single voltage controlling the wavelength. The linear antenna is a sparsely-populated array with eight broadband spiral elements. The transmitter operates in 2-18 GHz frequency range over +/- 50 degrees azimuth steering, and the receiver operates in 6-16 GHz frequency range over +/- 35 degrees azimuth steering. RP FRANKEL, MY (reprint author), USN,RES LAB,CODE 5672,WASHINGTON,DC 20375, USA. NR 11 TC 27 Z9 29 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD OCT PY 1995 VL 7 IS 10 BP 1216 EP 1218 DI 10.1109/68.466595 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA RZ222 UT WOS:A1995RZ22200040 ER PT J AU KRUPPA, W BOOS, JB AF KRUPPA, W BOOS, JB TI EXAMINATION OF THE KINK EFFECT IN INALAS/INGAAS/INP HEMTS USING SINUSOIDAL AND TRANSIENT EXCITATION SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID MOLECULAR-BEAM EPITAXY; GAAS-MESFETS; SIMULATION; SUBSTRATE; TRAP AB The kink effect in InAlAs/InGaAs/InP HEMTs is examined in the frequency domain using sinusoidal excitation and in the time domain using voltage pulses applied to the drain of the devices, With the sinusoidal excitation below the kink voltage, two prominent output-resistance frequency-response transitions attributed to traps in the InAlAs or its interfaces were found, These transitions were examined as functions of temperature and yielded trap activation energies near 0.18 and 0.56 eV. Above the kink voltage, a single, broad transition with an activation energy near 0.24 eV was found, Using incremental voltage pulses applied to the drain, a convenient kink signature was obtained. With large voltage pulses which span the kink region, a complex nonexponential transient response was observed due to concurrent capture and emission mechanisms. HEMTs with single- and double-recessed gate structures were found to have similar output resistance dispersion characteristics. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRUPPA, W (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 26 TC 41 Z9 41 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD OCT PY 1995 VL 42 IS 10 BP 1717 EP 1723 DI 10.1109/16.464427 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA RW010 UT WOS:A1995RW01000001 ER PT J AU HUESTIS, MA MITCHELL, JM CONE, EJ AF HUESTIS, MA MITCHELL, JM CONE, EJ TI DETECTION TIMES OF MARIJUANA METABOLITES IN URINE BY IMMUNOASSAY AND GC-MS SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID CHROMATOGRAPHY-MASS-SPECTROMETRY; FLUORESCENCE POLARIZATION IMMUNOASSAY; GAS-CHROMATOGRAPHY; ENZYME-IMMUNOASSAY; HALF-LIFE; CANNABINOIDS; USERS; TETRAHYDROCANNABINOL; EXCRETION; ACID C1 USN,DRUG SCREENING LAB,NAVAL AIR STN,JACKSONVILLE,FL 32212. RP HUESTIS, MA (reprint author), NIDA,ADDICT RES CTR,CHEM & DRUG METAB SECT,POB 5180,BALTIMORE,MD 21224, USA. NR 28 TC 71 Z9 75 U1 1 U2 15 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol PD OCT PY 1995 VL 19 IS 6 BP 443 EP 449 PG 7 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA RX548 UT WOS:A1995RX54800014 PM 8926739 ER PT J AU FREEMAN, DC EMLEN, JM AF FREEMAN, DC EMLEN, JM TI ASSESSMENT OF INTERSPECIFIC INTERACTIONS IN PLANT-COMMUNITIES - AN ILLUSTRATION FROM THE COLD DESERT SALTBUSH GRASSLANDS OF NORTH-AMERICA SO JOURNAL OF ARID ENVIRONMENTS LA English DT Article DE SPECIES INTERACTION; COMPETITION; COLD DESERT; SALTBUSH; GRASSLANDS ID CRYPTOGAMIC SOIL CRUSTS; UTAH; POPULATION; ALLOCATION; PATTERNS AB Interspecific interactions influence both the productivity and composition of plant communities. Here, we propose new field procedures and analytical approaches for assessing interspecific interactions in nature and apply these procedures to the salt desert shrub grasslands of western Utah. Data were collected from two grazing treatments over a period of 2 years. The proposed equations were fairly consistent across both treatments and years. In addition to illustrating how to assess interspecific interactions within a community, we also develop a new approach for projecting the community composition as a result of some alteration, i.e. increase or decrease in the abundance of one or more species. Results demonstrate competition both within and between plant life-form groups. While introduced annuals were found to depress profoundly the likelihood of perennial plants replacing themselves, perennials had little influence on annuals. Thus, as native perennials die, they are more likely to be replaced by perennials than for the reverse to occur. Our results suggest that unless conditions change, these communities will become increasingly dominated by introduced annuals. (C) 1995 Academic Press Limited C1 USN STN,US FISH & WILDLIFE SERV,SEATTLE,WA 98115. RP FREEMAN, DC (reprint author), WAYNE STATE UNIV,DEPT BIOL SCI,DETROIT,MI 48202, USA. NR 21 TC 18 Z9 19 U1 1 U2 4 PU ACADEMIC PRESS (LONDON) LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0140-1963 J9 J ARID ENVIRON JI J. Arid. Environ. PD OCT PY 1995 VL 31 IS 2 BP 179 EP 198 PG 20 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA RZ577 UT WOS:A1995RZ57700005 ER PT J AU Butcher, RJ BashirHashemi, A Gilardi, RD AF Butcher, RJ BashirHashemi, A Gilardi, RD TI The crystal and molecular structures of highly substituted cubanes: 1,2,4,7-tetra(carboxymethyl)cubane and 1,2,3,5,7-penta(carboxymethyl)cubane SO JOURNAL OF CHEMICAL CRYSTALLOGRAPHY LA English DT Article DE tetrasubstituted cubane derivatives; pentasubstituted cubane derivatives; 1,2-disubstituted cubane structures; cubane structures ID CHEMISTRY; BOND AB The structures of the title compounds, 1,2,4,7-tetra(carboxymethyl)cubane 1 and 1,2,3,5,7-penta(carboxymethyl)cubane 2, have been determined. 1 crystallized in the space group P (1) over bar with cell dimensions a = 6.098(2), b = 10.686(2), c = 13.459(2) Angstrom, alpha = 69.82(1), beta = 77.01(1), gamma = 74.00(1)degrees, while 2 crystallized in the monoclinic space group P2(1)/c with cell dimensions a = 15.139(2), b = 12.775(1), c = 9.849(2) Angstrom, beta = 107.01(1)degrees. These molecules were derived from their parent carboxylic acids by esterification with methanol. They are unusual for several reasons. The first is that they both contain substituents on adjacent carbon atoms in the cubane framework. There are only a few reports in the literature of this type of cubane structure. The second molecule is unique in that it has five substituents attached to a cubane moiety. This is the one of the few cubane derivatives with more than four substituents to be structurally characterized and results in a cubane molecule in which there are three faces with three substituents and three faces with only two substituents. C1 ARDEC,GEO CTR,LAKE HOPATCONG,NJ 07849. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP Butcher, RJ (reprint author), HOWARD UNIV,DEPT CHEM,525 COLL ST NW,WASHINGTON,DC 20059, USA. RI G, Neela/H-3016-2014 NR 24 TC 14 Z9 14 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 1074-1542 J9 J CHEM CRYSTALLOGR JI J. Chem. Crystallogr. PD OCT PY 1995 VL 25 IS 10 BP 661 EP 670 DI 10.1007/BF01665973 PG 10 WC Crystallography; Spectroscopy SC Crystallography; Spectroscopy GA TL437 UT WOS:A1995TL43700008 ER PT J AU SELTZER, MD AF SELTZER, MD TI INTERPRETATION OF THE EMISSION-SPECTRA OF TRIVALENT CHROMIUM-DOPED GARNET CRYSTALS USING TANABE-SUGANO DIAGRAMS SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article ID ENERGY-LEVELS; CR-3+; LASER; ND-3+ RP SELTZER, MD (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 8 TC 8 Z9 8 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD OCT PY 1995 VL 72 IS 10 BP 886 EP 888 PG 3 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA TF092 UT WOS:A1995TF09200014 ER PT J AU CAMPBELL, ML AF CAMPBELL, ML TI SIMPLE RULES FOR DETERMINING NUCLEAR-STABILITY AND TYPE OF RADIOACTIVE DECAY SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article RP CAMPBELL, ML (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD OCT PY 1995 VL 72 IS 10 BP 892 EP 893 PG 2 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA TF092 UT WOS:A1995TF09200016 ER PT J AU FEDDER, JA SLINKER, SP LYON, JG ELPHINSTONE, RD AF FEDDER, JA SLINKER, SP LYON, JG ELPHINSTONE, RD TI GLOBAL NUMERICAL-SIMULATION OF THE GROWTH-PHASE AND THE EXPANSION ONSET FOR A SUBSTORM OBSERVED BY VIKING SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID FIELD; MODEL AB We report the first global magnetohydrodynamic (MHD) simulation of an actual magnetospheric substorm, which was recorded by the Viking spacecraft on October 19, 1986. The simulation is driven by IMP 8 solar wind parameters measured upstream of the Earth's bow shock. The substorm, which had expansion onset at 1132 UT, was caused by a brief period of southward interplanetary magnetic field (IMF) and two weak solar wind shocks. The simulation model includes a self-consistent auroral ionospheric conductance depending directly on the MHD magnetospheric plasma parameters and magnetic field. Synthetic auroral emissions, derived from simulation results, are compared to the Viking images, which show considerable dayside activity preceding the substorm. We also compare model-derived synthetic AU and AL indices to geomagnetic measurements. The simulation results are seen to be in reasonable agreement with the observations throughout the growth phase and expansion onset. Moreover, the results allow us to form conclusions concerning which essential processes were responsible for the substorm occurence. These results are a highly encouraging first step leading toward development of a space weather forecasting methodology based on the directly measured solar input. C1 UNIV CALGARY,DEPT PHYS,CALGARY,AB T2N 1N4,CANADA. DARTMOUTH COLL,DEPT PHYS & ASTRON,HANOVER,NH 03755. SFA INC,LANDOVER,MD 20785. RP FEDDER, JA (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,CODE 6794,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 19 TC 128 Z9 130 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD OCT 1 PY 1995 VL 100 IS A10 BP 19083 EP 19093 DI 10.1029/95JA01524 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RY274 UT WOS:A1995RY27400002 ER PT J AU JOYCE, G CHEN, J SLINKER, S HOLLAND, DL HAROLD, JB AF JOYCE, G CHEN, J SLINKER, S HOLLAND, DL HAROLD, JB TI PARTICLE ENERGIZATION NEAR AN X-LINE IN THE MAGNETOTAIL BASED ON GLOBAL MHD FIELDS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID SHEET BOUNDARY-LAYER; PLASMA SHEET; GEOMAGNETIC TAIL; MAGNETIC RECONNECTION; COLLISIONLESS CONDUCTIVITY; DIFFERENTIAL MEMORY; NONLINEAR DYNAMICS; ION DISTRIBUTIONS; MODEL; ELECTRON AB Particle acceleration near an X line in the magnetotail and the resulting ion distribution functions in the central plasma sheet are studied by using 21/2-dimensional test particle simulations. The electric and magnetic fields are taken from a three-dimensional global magnetohydrodynamic (MHD) simulation model describing the solar wind-magnetosphere interaction. A southward interplanetary magnetic field is chosen as the input solar wind condition. Test particles are generated from a model ion source distribution consistent with the macroscopic MHD parameters in the lobe region. The particles are calculated earthward and tailward of the X line. It is found that ion distributions consist of two main components: a low-energy population similar to the input distribution and a high-energy population. The former corresponds to particles that do not cross the region in which the B-x field reverses direction, while the latter consists of particles which cross the midplane, gaining energies on the order of keV. The spatial dependence of the relative population of low-energy versus high-energy components is discussed. The details of the acceleration process are determined from the motion of test particles in the simulation. C1 ILLINOIS STATE UNIV,DEPT PHYS,NORMAL,IL 61761. RP JOYCE, G (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 44 TC 18 Z9 18 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD OCT 1 PY 1995 VL 100 IS A10 BP 19167 EP 19176 DI 10.1029/95JA00963 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RY274 UT WOS:A1995RY27400009 ER PT J AU SISKIND, DE STRICKLAND, DJ MEIER, RR MAJEED, T EPARVIER, FG AF SISKIND, DE STRICKLAND, DJ MEIER, RR MAJEED, T EPARVIER, FG TI ON THE RELATIONSHIP BETWEEN THE SOLAR SOFT-X-RAY FLUX AND THERMOSPHERIC NITRIC-OXIDE - AN UPDATE WITH AN IMPROVED PHOTOELECTRON MODEL SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ELECTRON-IMPACT; ODD NITROGEN; MESOSPHERE; STRATOSPHERE; EMISSION; DAYGLOW; N(2D); BAND; NM AB An improved photoelectron model is used to reevaluate the effect of solar soft X rays on lower thermospheric nitric oxide. The improvements include an extension of the upper bound of the energy grid from 450 to 800 eV, extension of the solar spectrum from 19 Angstrom down to 11 Angstrom, the incorporation of Auger ionization for wavelengths shortward of the K shell edge, and the inclusion of a non zero yield of N(D-2) from dissociative ionization of N-2 by electron impact. The impact of each of these upgrades is studied with a one-dimensional photochemical model and compared with previously published nitric oxide observations. It is shown that for conditions of high solar activity the photochemical model can now produce over twice as much nitric oxide for a given level of soft X ray input. The net effect of these changes is to reduce significantly the need for extremely large 18-50 Angstrom solar flux values in the model in order to reproduce NO observations which have peak densities of the order of 2 x 10(8) cm(-3). C1 COMPUTAT PHYS INC,FAIRFAX,VA 22031. NATL CTR ATMOSPHER RES,BOULDER,CO 80307. RP SISKIND, DE (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7641,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. RI Meier, Robert/G-4749-2014 OI Meier, Robert/0000-0001-8497-7115 NR 32 TC 27 Z9 27 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD OCT 1 PY 1995 VL 100 IS A10 BP 19687 EP 19694 DI 10.1029/95JA01609 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RY274 UT WOS:A1995RY27400054 ER PT J AU BEADLE, C MCELROY, PD OSTER, CN BEIER, JC OLOO, AJ ONYANGO, FK CHUMO, DK BALES, JD SHERWOOD, JA HOFFMAN, SL AF BEADLE, C MCELROY, PD OSTER, CN BEIER, JC OLOO, AJ ONYANGO, FK CHUMO, DK BALES, JD SHERWOOD, JA HOFFMAN, SL TI IMPACT OF TRANSMISSION INTENSITY AND AGE ON PLASMODIUM-FALCIPARUM DENSITY AND ASSOCIATED FEVER - IMPLICATIONS FOR MALARIA VACCINE TRIAL DESIGN SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID TREATED BED NETS; WESTERN KENYA; CEREBRAL MALARIA; GAMBIAN CHILDREN; AREA; ANOPHELES; MORTALITY; TANZANIA; AFRICA AB To facilitate design of vaccine trials, malaria was studied in 6-month- to 6-year-oId Kenyans during high (HI) and low intensity transmission seasons, During 84 days after cure, exposure to infected mosquitoes was 9-fold greater in the HI group, yet incidence of P. falciparum infection was increased only 2-fold, with no age effect. The density of recurrent P. falciparum was 14-fold greater in the HI group, and there was a striking association between age and parasitemia greater than or equal to 5000/mu L. Fever was the only clinical manifestation attributable to parasitemia and only when the parasite density was greater than or equal to 5000/mu L. Sixty-four percent of children with greater than or equal to 20,000 parasites/mu L versus 10% with 1-4999/mu L were febrile when parasitemic. Recurrent P. falciparum infection as a vaccine trial end point can be studied year-round among children greater than or equal to 6 years in western Kenya. However, high-grade parasitemia (greater than or equal to 5000 or 20,000/mu L) with or without elevated temperature will be optimally studied in the high transmission season among children <2 years. C1 USN,MED RES INST,MALARIA PROGRAM,ROCKVILLE,MD 20852. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT IMMUNOL & INFECT DIS,BALTIMORE,MD. USA,MED RES UNIT,NAIROBI,KENYA. USA,MED RES UNIT,KISUMU,KENYA. KENYA GOVT MED RES CTR,VECTOR BIOL & CONTROL RES CTR,KISUMU,KENYA. FU NIAID NIH HHS [AI-29000] NR 24 TC 43 Z9 44 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD OCT PY 1995 VL 172 IS 4 BP 1047 EP 1054 PG 8 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA RW062 UT WOS:A1995RW06200020 PM 7561179 ER PT J AU SASS, TR MEHAY, SL AF SASS, TR MEHAY, SL TI THE VOTING-RIGHTS ACT, DISTRICT ELECTIONS, AND THE SUCCESS OF BLACK CANDIDATES IN MUNICIPAL ELECTIONS SO JOURNAL OF LAW & ECONOMICS LA English DT Article ID AT-LARGE ELECTIONS; REPRESENTATION; IMPACT AB Over the last 20 years blacks and other minority groups have used the Voting Rights Act to challenge the legality of at-large election systems and promote the election of representatives by district. In this article we compare electoral outcomes over time in order to determine the effects of district elections on the success of black city council candidates in municipal elections. Consistent with previous cross-sectional analyses, we find that district elections aided black candidates in the early 1980s. However, our results also show that blacks have achieved substantially greater success in at-large elections over the last 10 years, thereby reducing the difference in representation among cities with different election systems. Our results are robust when interracial demographic differences and possible selection biases are taken into account. We conclude that the diminished efficacy of district elections is likely due to a reduction in the racial polarization of voters. C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. RP SASS, TR (reprint author), FLORIDA STATE UNIV,TALLAHASSEE,FL 32306, USA. NR 22 TC 11 Z9 11 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-2186 J9 J LAW ECON JI J. Law Econ. PD OCT PY 1995 VL 38 IS 2 BP 367 EP 392 DI 10.1086/467336 PG 26 WC Economics; Law SC Business & Economics; Government & Law GA TD237 UT WOS:A1995TD23700006 ER PT J AU JOHNSON, CE BENNETT, JM NADLER, MP AF JOHNSON, CE BENNETT, JM NADLER, MP TI OXIDATION OF DIAMOND WINDOWS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID FILMS AB Diamond windows were heated at 700-900 degrees C in air for short times to better define the limits of application at high temperature. The infrared (IR) transmission of polished chemical vapor deposition (CVD) diamond windows was reduced after heating in a furnace at 800 degrees C for 75 s, while heating at 700 degrees C for 75 s produced little change. The 800 degrees C heating caused increased visible light scatter, and increased scatter appears to be mainly responsible for the reduced IR transmission. The forward scatter at 10.6 mu m for the CVD diamond samples was 0.8% before heating, 2.8% after heating at 800 degrees C for 75 s, and 6.2% after heating at 800 degrees C for 255 s, Single crystal (110) type IIa diamond exhibited little change in IR transmission when heated at 800 degrees C in air for 255 s, while heating for 555 s at 800 degrees C caused a significant drop in IR transmittance (6-12%). A slight drop in IR transmittance (1-5%) occurred for a type IIa diamond when heated at 900 degrees C for 45 s. The etched surfaces were characterized by differential interference contrast optical microscopy, scanning electron microscopy, and Talystep surface profiles. Etched features are concentrated at grain boundaries (for the CVD samples) and at sites with residual damage from mechanical polishing that could not be seen before the heat treatment. Deep etch pits formed at grain boundaries that extend into the bulk of samples. C1 USN,CTR AIR WARFARE,DIV WEAP,DIV RES & TECHNOL,PHYS BRANCH,CHINA LAKE,CA 93555. RP JOHNSON, CE (reprint author), USN,CTR AIR WARFARE,DIV WEAP,DIV RES & TECHNOL,CHEM & MAT BRANCH,CHINA LAKE,CA 93555, USA. NR 9 TC 10 Z9 10 U1 1 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1995 VL 10 IS 10 BP 2555 EP 2563 DI 10.1557/JMR.1995.2555 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA RV891 UT WOS:A1995RV89100026 ER PT J AU ISENBERG, MT AF ISENBERG, MT TI IMPERIAL WAR MUSEUM FILM CATALOG, VOL 1, WORLD-WAR-I ARCHIVE - SMITHER,R SO JOURNAL OF MILITARY HISTORY LA English DT Book Review RP ISENBERG, MT (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU VIRGINIA MILITARY INST PI LEXINGTON PA LEXINGTON, VA 24450 SN 0899-3718 J9 J MILITARY HIST JI J. Mil. Hist. PD OCT PY 1995 VL 59 IS 4 BP 729 EP 730 DI 10.2307/2944501 PG 2 WC History SC History GA TA533 UT WOS:A1995TA53300008 ER PT J AU COYER, JA ROBERTSON, DL ALBERTE, RS AF COYER, JA ROBERTSON, DL ALBERTE, RS TI GENETIC-VARIABILITY AND PARENTAGE IN MACROCYSTIS-PYRIFERA (PHAEOPHYCEAE) USING MULTILOCUS DNA-FINGERPRINTING SO JOURNAL OF PHYCOLOGY LA English DT Article DE DNA FINGERPRINTS; GENETIC VARIATION; M13 PROBE; MACROCYSTIS PYRIFERA; PARENTAGE; PHAEOPHYTA ID EXTRA-PAIR PATERNITY; POPULATIONS; PROBE; PREFERENCE; DIVERSITY; KINSHIP; GROWTH; BIRDS; LIONS AB Multi-locus DNA fingerprints using an M13 probe were obtained for two individuals of Macrocystis pyrifera (L.) C. Ag. collected from Monterey Bay, California, and their laboratory-reared offspring. DNA was extracted from each of two field-collected individuals (= parents), their self-fertilized diploid offspring (three and seven individuals), and one diploid individual resulting from spores of the two parents. A total of 20 bands (4-19 kb) was detected among all individuals, ranging from 7 to 24 bands for any one individual. Two bands were present in all individuals, and three bands were unique to one parent and its three progeny. Ten bands were observed in the outcrossed individual, of which three were inherited from one parent, two from the other parent, and five were present in both parents. Genetic similarity between each parent and their self-fertilized offspring was significantly higher than similarity between the two self-fertilized groups. The data show that multi-locus DNA fingerprints can be used to assess parentage in the giant kelp and that there is consistent agreement between genetic similarity and known genetic relatedness among parents and offspring. C1 UNIV CALIF LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90024. UNIV CHICAGO,DEPT MOLEC GENET & CELL BIOL,CHICAGO,IL 60637. OFF NAVAL RES,BIOL SCI & TECHNOL PROGRAM,ARLINGTON,VA 22217. RI Coyer, James/B-3295-2010 NR 28 TC 8 Z9 9 U1 0 U2 2 PU PHYCOLOGICAL SOC AMER INC PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044 SN 0022-3646 J9 J PHYCOL JI J. Phycol. PD OCT PY 1995 VL 31 IS 5 BP 819 EP 823 DI 10.1111/j.0022-3646.1995.00819.x PG 5 WC Plant Sciences; Marine & Freshwater Biology SC Plant Sciences; Marine & Freshwater Biology GA TD903 UT WOS:A1995TD90300020 ER PT J AU CHEN, HC AF CHEN, HC TI THE INFLUENCE OF AZIMUTHAL MOTION ON ION RESONANCE INSTABILITY FOR A NONNEUTRAL PLASMA-COLUMN SO JOURNAL OF PLASMA PHYSICS LA English DT Article AB A general treatment of ion resonance instability for a non-neutral plasma column is performed using a macroscopic cold-fluid-Maxwell model. The azimuthal motion of the plasma components has an important influence on the behaviour of the instability. When the electrons are in slow rotational equilibrium, the instability occurs in both slow and fast ion rotational equilibrium. However, there is stability when the electrons are in fast rotational equilibrium except that the l = 1 mode becomes unstable and independent of plasma rotation. The kink (l = 1) mode only occurs when the plasma column boundary exceeds a certain threshold value that depends on the ratio of the plasma frequency to the cyclotron frequency. RP CHEN, HC (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 6 TC 2 Z9 2 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-3778 J9 J PLASMA PHYS JI J. Plasma Phys. PD OCT PY 1995 VL 54 BP 173 EP 183 PN 2 PG 11 WC Physics, Fluids & Plasmas SC Physics GA TJ907 UT WOS:A1995TJ90700004 ER PT J AU DASGUPTA, A AF DASGUPTA, A TI DIELECTRONIC RECOMBINATION RATES TO THE N=3 SINGLY EXCITED-STATES - THE NEON SEQUENCE SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article ID X-RAY LASER; SELENIUM AB In this work we present the state-specific dielectronic recombination rate coefficients to the n = 3 single excited state of Ar IX, Ti XIII, Fe XVII and Se XXV. Results presented involve detailed calculations of radiative and autoionization rates to ground as well as excited states of the recombining ions. Coefficients of least-squares polynomial fits to the calculated data are also provided for temperature range 0.01-5.0 keV. RP DASGUPTA, A (reprint author), USN,RES LAB,DIV PLASMA PHYS,RADIAT HYDRODYNAM BRANCH,WASHINGTON,DC 20375, USA. NR 16 TC 2 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD OCT PY 1995 VL 54 IS 4 BP 737 EP 743 DI 10.1016/0022-4073(95)00106-U PG 7 WC Optics; Spectroscopy SC Optics; Spectroscopy GA RW535 UT WOS:A1995RW53500012 ER PT J AU MCNAMARA, MF AF MCNAMARA, MF TI POSTOPERATIVE RUPTURE OF A HEPATIC-ARTERY ANEURYSM - A CASE-REPORT SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Note DE HEPATIC ARTERY; ANEURYSM, RUPTURED; POSTOPERATIVE COMPLICATIONS AB BACKGROUND: Hepatic artery aneurysm is a rare finding, and its unsuspected rupture in the postoperative period can present a confusing clinical picture. CASE: A patient under went vaginal surgery for complete procidentia and on postoperative day 1 developed hemorrhagic shock. Emergency exploratory laparotomy revealed a ruptured left hepatic artery aneurysm. CONCLUSION: Hepatic artery aneurysms are rare, and when they rupture, prompt diagnosis and therapy are essential to survival. C1 USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0024-7758 J9 J REPROD MED JI J. Reprod. Med. PD OCT PY 1995 VL 40 IS 10 BP 736 EP 738 PG 3 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA TA495 UT WOS:A1995TA49500015 PM 8551480 ER PT J AU SINGH, DJ PICKETT, WE AF SINGH, DJ PICKETT, WE TI BAND-STRUCTURE OF BI2SR2CUO6 - STRONG EFFECTS DUE TO STRUCTURAL MODULATION SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT University-of-Miami Workshop on High-Temperature Superconductivity - Physical Properties and Mechanisms CY JAN 05-11, 1995 CL CORAL GABLES, FL SP USN, Off Naval Res, Univ Miami DE ELECTRONIC STRUCTURE; BI2SR2CUO6; MODULATION ID ANGLE-RESOLVED PHOTOEMISSION; ELECTRONIC-STRUCTURE; FERMI-SURFACE; BI2SR2CACU2O8; SUPERCONDUCTORS; STATE; BISMUTH; GAP; TC AB The electronic structure of idealized tetragonal Bi2Sr2CuO6 is compared with that of an orthorhombic root 2x root 2 model that includes atomic displacements due to the structural modulation. The electronic structure, particularly that related to Bi and O(3) atoms, is strongly modified near the Fermi energy. In particular the shape and topology of the Bi-O(3) related Fermi surfaces near the ($) over bar M point are changed. With the modulation, bands occur near the Fermi energy over a significant part of the zone near this point. A method is proposed to distinguish between lattice distortions and antiferromagnetic correlations as the cause of recently observed shadow Fermi surfaces. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 21 TC 10 Z9 10 U1 1 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD OCT PY 1995 VL 8 IS 5 BP 583 EP 586 DI 10.1007/BF00727431 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA RX141 UT WOS:A1995RX14100013 ER PT J AU AGASSI, D BARDO, RD AF AGASSI, D BARDO, RD TI FLUX-CREEP IN A TWIN BOUNDARY MODEL SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT University-of-Miami Workshop on High-Temperature Superconductivity - Physical Properties and Mechanisms CY JAN 05-11, 1995 CL CORAL GABLES, FL SP USN, Off Naval Res, Univ Miami DE FLUX PINNING; TWIN BOUNDARIES; KIM-ANDERSON FORMULA AB The escape probability for a vortex from a realistic twin boundary pinning potential is calculated and compared to the corresponding Kim-Anderson expression. The comparison indicates that for HTS parameters, the escape probability depends on the pinning-potential shape, and substantially deviates from the Kim-Anderson expression due to the neglect of diffusive motion in and in between the pinning potential wells. RP AGASSI, D (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,WHITE OAK,MD 20903, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD OCT PY 1995 VL 8 IS 5 BP 599 EP 600 DI 10.1007/BF00727435 PG 2 WC Physics, Applied; Physics, Condensed Matter SC Physics GA RX141 UT WOS:A1995RX14100017 ER PT J AU BROWNING, VM OSOFSKY, MS SOULEN, RJ SKELTON, EF EHRLICH, AC DOSSEUL, F GAUTHIER, S AF BROWNING, VM OSOFSKY, MS SOULEN, RJ SKELTON, EF EHRLICH, AC DOSSEUL, F GAUTHIER, S TI MAGNETOTRANSPORT AND MAGNETISM IN SINGLE-CRYSTAL PR1BA2CU3O7-DELTA SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT University-of-Miami Workshop on High-Temperature Superconductivity - Physical Properties and Mechanisms CY JAN 05-11, 1995 CL CORAL GABLES, FL SP USN, Off Naval Res, Univ Miami DE PR,; PR-BA-CU-O; MAGNETOTRANSPORT; MAGNETIZATION ID PRBA2CU3O7; SUPERCONDUCTIVITY; SUPPRESSION AB The results of magnetoresistance and magnetization measurements taken on a single crystal of PrBa2Cu3O7-delta are reported. Among the family of materials known as the 1-2-3 compounds, only Pr 1-2-3 exhibits non-metallic transport and is not superconducting. Our results suggest that hybridization of Pr orbitals with Cu-O valence states may be responsible for the nonmetallic transport properties of Pr 1-2-3. C1 INST NATL SCI APPL,PHYS SOLIDES LAB,F-31077 TOULOUSE,FRANCE. INST NATL SCI APPL,SERV CHAMPS INTENSES,F-31077 TOULOUSE,FRANCE. RP BROWNING, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 11 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD OCT PY 1995 VL 8 IS 5 BP 605 EP 606 DI 10.1007/BF00727438 PG 2 WC Physics, Applied; Physics, Condensed Matter SC Physics GA RX141 UT WOS:A1995RX14100020 ER PT J AU DREWS, AR SKELTON, EF OSOFSKY, MS QADRI, SB LIEBENBERG, DH SUN, GF WONG, KW XIN, Y AF DREWS, AR SKELTON, EF OSOFSKY, MS QADRI, SB LIEBENBERG, DH SUN, GF WONG, KW XIN, Y TI PRESSURE-DEPENDENCE OF T-C IN TL0.2HG0.8BA2CA2CU3OX SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT University-of-Miami Workshop on High-Temperature Superconductivity - Physical Properties and Mechanisms CY JAN 05-11, 1995 CL CORAL GABLES, FL SP USN, Off Naval Res, Univ Miami DE (HG,TL)-BA-CA-CU-O; PRESSURE EFFECT; AC SUSCEPTIBILITY ID SUPERCONDUCTIVITY AB We report results of our study of the pressure dependence of T-c in Tl0.2Hg0.8Ba2Ca2CU3Ox to 6 GPa in a diamond anvil cell. The sample studied has an ambient T-c of 136.4 K and application of quasihydrostatic pressure raised T-c to 144.4 K at 6 GPa. We will also describe recent modifications of our ac susceptibility apparatus that have improved our sensitivity while simplifying the coil design and the balancing. C1 OFF NAVAL RES,ARLINGTON,VA 22217. UNIV KANSAS,LAWRENCE,KS 66045. MIDWEST SUPERCONDUCT INC,LAWRENCE,KS 66049. RP DREWS, AR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 7 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD OCT PY 1995 VL 8 IS 5 BP 615 EP 616 DI 10.1007/BF00727443 PG 2 WC Physics, Applied; Physics, Condensed Matter SC Physics GA RX141 UT WOS:A1995RX14100025 ER PT J AU HUANG, H GAUNAURD, GC AF HUANG, H GAUNAURD, GC TI ACOUSTIC SCATTERING OF A PLANE-WAVE BY 2 SPHERICAL ELASTIC SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The acoustic scattering by two spherical elastic shells in close proximity insonified by plane waves at arbitrary angles of incidence is analyzed exactly in the low- and intermediate-frequency ranges. The incident and scattering wave fields are expanded in terms of the classical modal series and the addition theorem for the spherical wave functions facilitates the exact expression of the sound fields scattered by each spherical elastic shell in the presence of the other, referred to coordinate systems at the centers of either spherical shell. The solution to the scattering problem is obtained by simultaneously solving the Helmholtz equation governing the wave motion in the:fluid medium in which the two shells are submerged and the two sets of equations of motion of the two elastic shells satisfying the boundary conditions at all fluid-shell interfaces and the far-field radiation condition. Numerical computation of the scattered wave pressure involves the solution of the truncation of an ill-conditioned complex matrix system the size of which depends on how many terms of the modal series are required for convergence. This in turn depends on the value of the frequency, and on the proximity of the two spherical elastic shells. The ill-conditioned matrix equation is solved using the Gauss-Seidel iteration method and Twersky's method of successive iteration double checking each other. Backscattered echoes from two identical spherical elastic shells are extensively calculated. The result also demonstrates that the large amplitude low-frequency resonances of the echoes of the neighboring elastic shells shift downward with proximity to each other. This can be attributed to the increase of added mass for the vibration of the shells. (C) 1995 Acoustical Society of America. C1 USN, CTR SURFACE WARFARE, DIV CARDEROCK, SILVER SPRING, MD 20903 USA. RP HUANG, H (reprint author), USN, CTR SURFACE WARFARE, DIV INDIAN HEAD, WHITE OAK, SILVER SPRING, MD 20903 USA. NR 10 TC 19 Z9 22 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1995 VL 98 IS 4 BP 2149 EP 2156 DI 10.1121/1.413329 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RY394 UT WOS:A1995RY39400037 ER PT J AU DICKEY, J MAIDANIK, G UBERALL, H AF DICKEY, J MAIDANIK, G UBERALL, H TI THE SPLITTING OF DISPERSION-CURVES FOR THE FLUID-LOADED PLATE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB The splitting of the free-wave dispersion curve for a fluid-loaded plate into sub- and supersonic branches, and the apparent ''repulsion'' of these two branches, is discussed. (C) 1995 Acoustical Society of America. C1 CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. RP DICKEY, J (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS,MD 21402, USA. NR 2 TC 21 Z9 23 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1995 VL 98 IS 4 BP 2365 EP 2367 DI 10.1121/1.413283 PG 3 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RY394 UT WOS:A1995RY39400058 ER PT J AU Srinivas, V Chopra, I Haas, D McCool, K AF Srinivas, V Chopra, I Haas, D McCool, K TI Prediction of tail rotor thrust and yaw control effectiveness SO JOURNAL OF THE AMERICAN HELICOPTER SOCIETY LA English DT Article AB A comprehensive tail rotor model capable of predicting the tail rotor thrust under a combination of axial and edgewise flow is developed. The predicted tail rotor thrust is correlated in hover and in low speed flight at different azimuth angles, An empirical tail rotor/vertical fin interaction model is developed from wind tunnel data, Predictions of the SH-2 trim pedal position with the isolated tail rotor alone as well as including the main rotor wake and tail rotor/fin interactions are obtained and correlated with flight test data, The isolated main rotor wake induces considerable velocities at the tail rotor location and, when included in the analysis, has a significant effect on the predictions of pedal position, The tail rotor/fin interactions affect the predictions of pedal position considerably in right sideward flight, particularly at speeds above 25 knots. C1 USN,CTR SURFACE WARFARE,CARDEROCK DIV,DAVID TAYLOR MODEL BASIN,BETHESDA,MD. RP Srinivas, V (reprint author), UNIV MARYLAND,CTR ROTORCRAFT EDUC & RES,DEPT AEROSP ENGN,COLLEGE PK,MD 20742, USA. NR 17 TC 0 Z9 1 U1 0 U2 0 PU AMER HELICOPTER SOC INC PI ALEXANDRIA PA 217 N WASHINGTON ST, ALEXANDRIA, VA 22314 SN 0002-8711 J9 J AM HELICOPTER SOC JI J. Am. Helicopter Soc. PD OCT PY 1995 VL 40 IS 4 BP 34 EP 43 PG 10 WC Engineering, Aerospace SC Engineering GA TM061 UT WOS:A1995TM06100003 ER PT J AU IKOSSIANASTASIOU, K BINARI, SC KELNER, G BOOS, JB KYONO, CS MITTEREDER, J GRIFFIN, GL AF IKOSSIANASTASIOU, K BINARI, SC KELNER, G BOOS, JB KYONO, CS MITTEREDER, J GRIFFIN, GL TI WET CHEMICAL ETCHING WITH LACTIC-ACID SOLUTIONS FOR INP-BASED SEMICONDUCTOR-DEVICES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB We report the incorporation of lactic acid etch mixtures in selective and nonselective etches suitable for InP-based III-V compound semiconductor heterostructure devices. Elimination and reduction of surface structures and controllable sidewall profiles are possible with solutions operating in the diffusion-limited, chemical activation-limited transition region. C1 LOUISIANA STATE UNIV,DEPT ELECT & COMP ENGN,BATON ROUGE,LA 70808. USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. LOUISIANA STATE UNIV,DEPT CHEM ENGN,BATON ROUGE,LA 70808. NR 14 TC 6 Z9 6 U1 1 U2 4 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD OCT PY 1995 VL 142 IS 10 BP 3558 EP 3564 DI 10.1149/1.2050022 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA RZ328 UT WOS:A1995RZ32800070 ER PT J AU PORCH, D AF PORCH, D TI THE FRONTIER IN FRENCH IMPERIAL IDEOLOGY SO JOURNAL OF THE WEST LA English DT Article C1 CITADEL,CHARLESTON,SC 29409. RP PORCH, D (reprint author), USN WAR COLL,NEWPORT,RI, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU J WEST INC PI MANHATTAN PA P O BOX 1009 1531 YUMA, MANHATTAN, KS 66502 SN 0022-5169 J9 J WEST JI J. West PD OCT PY 1995 VL 34 IS 4 BP 16 EP 22 PG 7 WC History SC History GA TA119 UT WOS:A1995TA11900004 ER PT J AU LIU, T CAMPBELL, BT SULLIVAN, JP LAFFERTY, J YANTA, W AF LIU, T CAMPBELL, BT SULLIVAN, JP LAFFERTY, J YANTA, W TI HEAT-TRANSFER MEASUREMENT ON A WAVERIDER AT MACH-10 USING FLUORESCENT PAINT SO JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER LA English DT Article AB The principles of the fluorescent paint technique for global surface temperature measurement are presented. This technique is used to measure the surface temperature and heat transfer on the windward side of a waverider model at Mach 10. The model used for calculation of heat transfer for hypersonic flow over an insulating layer is also discussed. Quantitative comparisons between heat transfer measured by the fluorescent paint and data obtained by thermocouples are made with good agreement. The heat transfer maps are able to clearly show not only transition from laminar to turbulent now, but also movement of the transition line. C1 USN,CTR SURFACE WARFARE,DEPT STRATEG & SPACE SYST,WHITE OAK,MD 20910. RP LIU, T (reprint author), PURDUE UNIV,SCH AERONAUT & ASTRONAUT,W LAFAYETTE,IN 47906, USA. NR 17 TC 17 Z9 20 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0887-8722 J9 J THERMOPHYS HEAT TR JI J. Thermophys. Heat Transf. PD OCT-DEC PY 1995 VL 9 IS 4 BP 605 EP 611 DI 10.2514/3.714 PG 7 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA TB802 UT WOS:A1995TB80200004 ER PT J AU TUREN, CH MARK, JB BOZMAN, CDRR AF TUREN, CH MARK, JB BOZMAN, CDRR TI COMPARATIVE-ANALYSIS OF RADIOGRAPHIC INTERPRETATION OF ORTHOPEDIC FILMS - IS THERE REDUNDANCY SO JOURNAL OF TRAUMA-INJURY INFECTION AND CRITICAL CARE LA English DT Article AB Cost containment is becoming the watchword in today's medical care environment. In an effort to determine possible areas of unnecessary patient cost secondary to redundant services, we decided to compare prospectively interpretations of plain orthopedic films by radiologists and orthopedists. Without performing a physical examination of the patient, orthopedic surgical attendings and radiology attendings independently read 507 consecutive radiographic studies of acute orthopedic injuries sustained by 438 patients. All readings were dictated, and the reports were reviewed by the senior author and statistically analyzed. The cost of the radiologists) readings was computed. Analysis of the two types of readings showed that both were highly sensitive and very specific, and that there was no statistically significant difference (p = 1.0) between them. The average cost of the radiologists' readings in the local area was approximately $16,100. There was no fee for orthopedic interpretations in this study. The authors conclude that because the two interpretations were accurate and not statistically different, interpretation of orthopedic films by a radiologist seems to be an unnecessary expense. C1 USN,MED CTR,DEPT ORTHOPED,PORTSMOUTH,VA. USN,MED CTR,DEPT RADIOL,PORTSMOUTH,VA. RP TUREN, CH (reprint author), UNIV MARYLAND,MED CTR,R ADAMS COWLEY SHOCK TRAUMA CTR,PROGRAM TRAUMA,ORTHOPAED SECT,BALTIMORE,MD 21212, USA. NR 4 TC 7 Z9 7 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1079-6061 J9 J TRAUMA JI J. Trauma-Injury Inf. Crit. Care PD OCT PY 1995 VL 39 IS 4 BP 720 EP 721 DI 10.1097/00005373-199510000-00019 PG 2 WC Critical Care Medicine; Surgery SC General & Internal Medicine; Surgery GA TC853 UT WOS:A1995TC85300019 PM 7473962 ER PT J AU LITTLE, B RAY, R HART, K WAGNER, P AF LITTLE, B RAY, R HART, K WAGNER, P TI FUNGAL-INDUCED CORROSION OF WIRE ROPE SO MATERIALS PERFORMANCE LA English DT Article AB Localized corrosion of carbon steel wire rope stored in a humid environment on wooden spools was caused by organic acid and carbon dioxide production by fungi growing directly on the wood. Fungal growth was found on the interiors of the wooden spools, and corrosion was most severe on the wrap of wire in direct contact with the wood. Laboratory experiments and an extensive review of the literature demonstrated causal relationships between storage conditions and fungal growth and localized corrosion. RP LITTLE, B (reprint author), USN,RES LAB,STENNIS SPACE CTR,BAY ST LOUIS,MS 39529, USA. NR 17 TC 8 Z9 8 U1 0 U2 0 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0094-1492 J9 MATER PERFORMANCE JI Mater. Perform. PD OCT PY 1995 VL 34 IS 10 BP 55 EP 58 PG 4 WC Materials Science, Characterization & Testing SC Materials Science GA RZ549 UT WOS:A1995RZ54900017 ER PT J AU CUTLER, DL GRAY, CG PARK, SW HICKMAN, MG BELL, JM KOLTERMAN, OG AF CUTLER, DL GRAY, CG PARK, SW HICKMAN, MG BELL, JM KOLTERMAN, OG TI LOW-CARBOHYDRATE DIET ALTERS INTRACELLULAR GLUCOSE-METABOLISM BUT NOT OVERALL GLUCOSE DISPOSAL IN EXERCISE-TRAINED SUBJECTS SO METABOLISM-CLINICAL AND EXPERIMENTAL LA English DT Article ID DEPENDENT DIABETES-MELLITUS; INSULIN RESISTANCE; POSTRECEPTOR DEFECTS; GLYCOGEN-SYNTHASE; PYRUVATE-DEHYDROGENASE; SKELETAL-MUSCLE; FAT-CELLS; INVIVO; OXIDATION; BINDING AB Dietary composition has been strongly implicated as an important determinant of in vivo insulin sensitivity. However, the metabolic alterations associated with extreme changes in diet have not been well described. We compared glucose metabolism after a standard diet ([STD] 35% fat, 51% carbohydrate, and 14% protein) with the effects of a 3-week adaptation to a low-carbohydrate, high-fat diet ([LCD] 75% fat, 8% carbohydrate, and 17% protein). Ten healthy men were studied using the euglycemic clamp technique, indirect calorimetry, and percutaneous vastus lateralis muscle biopsies for analysis of glycogen synthase (GS) and pyruvate dehydrogenase (PDH) activities in the basal and insulin-stimulated states. Insulin-stimulated glucose disposal was unchanged (STD 46.1 +/- 4.3 v LCD 46.0 +/- 4.3 mu mol/kg . min, P = NS), but marked alterations in the routes of glucose disposal were noted. Insulin-stimulated glucose oxidation (G(ox)) was markedly reduced following LCD (STD 18.6 +/- 1.9 v LCD 8.23 +/- 1.9 pmol/kg min, P=.0001), and nonoxidative glucose metabolism (G(nox)) was enhanced by LCD (STD 24.9 +/- 0.9 v LCD 38.9 +/- 4.3 mu mol/kg . min, P=.03). Following LCD, both the total and active forms of PDH (PDHt and PDHa) were significantly depressed. After LCD, GS activities (FV0.1, %I, and A(0.5)) were unaffected in the basal state, but were greater than for STD (P=.004) after insulin stimulation. The apparent increase in the sensitivity of GS to activation by insulin following LCD correlated strongly with maximal O-2 consumption ([Vo(2)max] r=.97, P=.001), suggesting that physical conditioning interacted with the metabolic impact of LCD. In summary, LCD did not induce changes in net glucose disposal. However, LCD decreased insulin-stimulated G(ox), with a correspondingly diminished activity of PDH, the rate limiting enzyme for G(ox). There was a reciprocal increase in insulin-stimulated G(nox) concomitant with increased activation of GS, which was consistent with increased potential for glycogen synthesis. C1 USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. UNIV CALIF SAN DIEGO,MED CTR,DEPT MED,SAN DIEGO,CA 92103. FU NCRR NIH HHS [MO1 RR00827] NR 43 TC 29 Z9 29 U1 1 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0026-0495 J9 METABOLISM JI Metab.-Clin. Exp. PD OCT PY 1995 VL 44 IS 10 BP 1264 EP 1270 DI 10.1016/0026-0495(95)90027-6 PG 7 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA TB960 UT WOS:A1995TB96000006 PM 7476282 ER PT J AU METZBOWER, EA AF METZBOWER, EA TI TEMPERATURES IN THE KEYHOLE SO METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE LA English DT Article ID ALLOYING ELEMENT VAPORIZATION; ELECTRON-BEAM; METAL VAPORIZATION; STAINLESS-STEEL; PLASMA AB The size and temperatures of the keyhole have been calculated through the thickness of the plate being welded. The temperature calculations are based on a critical intensity and the power loss resulting from vaporization. The evaporative power loss is set equal to the Gaussian power density, which is used to represent the laser beam. The result is a temperature distribution across the surface of the plate. The temperatures through the thickness of the plate are calculated on the basis of a minimum intensity at the bottom of a drilled hole. The intensity at the bottom of the plate is assumed to exceed this minimum intensity. This permits an absorption coefficient to be calculated. Thus, the intensity through the thickness can be calculated and the temperatures corresponding to this intensity can also be evaluated. The results are used to explain the ''nail head'' appearance of the fusion zone, which is quite common in laser beam welds. The results also explain some visual observations of laser beam welds. RP METZBOWER, EA (reprint author), USN, RES LAB, PHYS MET BRANCH, WASHINGTON, DC 20375 USA. NR 24 TC 5 Z9 6 U1 0 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 1073-5615 J9 METALL MATER TRANS B JI Metall. Mater. Trans. B-Proc. Metall. Mater. Proc. Sci. PD OCT PY 1995 VL 26 IS 5 BP 1029 EP 1033 DI 10.1007/BF02654105 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RY672 UT WOS:A1995RY67200015 ER PT J AU Walters, RJ AF Walters, RJ TI A review of radiation effects in InP solar cells SO MICROELECTRONICS JOURNAL LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; RESISTANCE RP Walters, RJ (reprint author), USN,RES LAB,CODE 6615,WASHINGTON,DC 20375, USA. NR 24 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER ADVANCED TECHNOLOGY PI OXFORD PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0026-2692 J9 MICROELECTR J JI Microelectron. J. PD OCT PY 1995 VL 26 IS 7 BP 697 EP 704 DI 10.1016/0026-2692(95)00052-J PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology SC Engineering; Science & Technology - Other Topics GA TL172 UT WOS:A1995TL17200007 ER PT J AU WAX, JR TEMPANY, CM SLOWEY, MJ SMITH, JF FLOYD, RC AF WAX, JR TEMPANY, CM SLOWEY, MJ SMITH, JF FLOYD, RC TI 2ND-TRIMESTER UTERINE ATONY IMITATING ECTOPIC PREGNANCY - MAGNETIC-RESONANCE DIAGNOSIS SO MILITARY MEDICINE LA English DT Note AB When an obstetrical patient was referred for inability to auscultate fetal heart tones at 18 weeks' gestation, ultrasound identified a single living fetus in the maternal right upper quadrant, Magnetic resonance imaging (MRI) ruled out a suspected uterine ectopic pregnancy and avoided laparotomy. The patient experienced an uncomplicated term delivery, MRI is a useful adjunct to ultrasound for mid-trimester pregnancy localization when the differential diagnosis includes uterine eccyesis. RP WAX, JR (reprint author), USN,MED CTR,DEPT OBSTET & GYNECOL,DIV MATERNAL FETAL MED,PORTSMOUTH,VA 23708, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD OCT PY 1995 VL 160 IS 10 BP 534 EP 535 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA RZ326 UT WOS:A1995RZ32600017 PM 7501205 ER PT J AU READ, RR AF READ, RR TI THE EVOLUTION OF A SELECTION SYSTEM SO NAVAL RESEARCH LOGISTICS LA English DT Article AB The article is a case study. It describes the initialization and subsequent modifications of the selection process used for the annual Award for Excellence in Teaching at the Naval Postgraduate School (NPS). The method treats highly unbalanced data and utilizes some exploratory data analysis techniques in interesting ways. It leads to a defensible choice for a winner in a very messy setting. The award designates a faculty member as ''teacher of the year'' and includes a stipend of substantial value. The recipient is chosen by a committee which reviews objective information summarized from ballots submitted by franchised voters. The issues encountered have some general content and the handling of a number of them may have broader interest. (C) John Wiley & Sons, Inc.* RP READ, RR (reprint author), USN,POSTGRAD SCH,MONTEREY,CA, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD OCT PY 1995 VL 42 IS 7 BP 1099 EP 1108 DI 10.1002/1520-6750(199510)42:7<1099::AID-NAV3220420708>3.0.CO;2-J PG 10 WC Operations Research & Management Science SC Operations Research & Management Science GA RV369 UT WOS:A1995RV36900006 ER PT J AU MAKRIS, NC AF MAKRIS, NC TI A FOUNDATION FOR LOGARITHMIC MEASURES OF FLUCTUATING INTENSITY IN PATTERN-RECOGNITION SO OPTICS LETTERS LA English DT Article AB Independent analyses using Fisher information, optimal filtering, and information theory show that matched filtering images with hypothetical patterns in the logarithmic domain provides an optimal method for pattern recognition in the presence of signal-dependent noise arising from complex Gaussian fluctuations in the received fields. This provides a mathematical justification for the use of logarithmic units (i.e., decibels) in a variety of engineering applications. RP MAKRIS, NC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 19 Z9 19 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 1 PY 1995 VL 20 IS 19 BP 2012 EP 2014 DI 10.1364/OL.20.002012 PG 3 WC Optics SC Optics GA RW114 UT WOS:A1995RW11400028 PM 19862234 ER PT J AU SHICK, PC RIORDAN, GP FOSS, RD AF SHICK, PC RIORDAN, GP FOSS, RD TI ESTROGEN AND PROGESTERONE RECEPTORS IN SALIVARY-GLAND ADENOID CYSTIC CARCINOMA SO ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTICS LA English DT Article ID STEROID-HORMONE RECEPTORS; BREAST-CANCER; MONOCLONAL-ANTIBODY; TUMORS; PROTEIN; MANAGEMENT; ESTRADIOL; MELANOMA; TISSUE AB Adenoid cystic carcinomas of salivary glands occur more frequently in women and bear remarkable similarity to adenoid cystic carcinomas of the breast. In addition, breast carcinomas express estrogen and progesterone receptors that impart prognostic significance. This suggests a possible role for sex steroid hormones in the development and progression of salivary gland adenoid cystic carcinoma. On this basis, 12 samples of formalin-fixed, paraffin-embedded salivary gland adenoid cystic carcinomas and 12 samples of normal salivary gland tissue were immunohistochemically evaluated for estrogen and progesterone receptor protein expression. Estrogen receptors were not detected in either group; however, a significantly higher progesterone receptor level was evident in the neoplastic group compared with normal tissue (p < 0.01). These data confirm the presence of progesterone receptors within normal and neoplastic salivary gland tissue. Progesterone receptor expression may be of possible prognostic and therapeutic value in some cases of adenoid cystic carcinoma. C1 USN,NAVAL DENT CTR,DEPT LAB MED,BETHESDA,MD 20889. RP SHICK, PC (reprint author), USN,NATL DENT CTR,DEPT ORAL PATHOL,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 42 TC 30 Z9 31 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 1079-2104 J9 ORAL SURG ORAL MED O JI Oral Surg. Oral Med. Oral Pathol. Oral Radiol. Endod. PD OCT PY 1995 VL 80 IS 4 BP 440 EP 444 DI 10.1016/S1079-2104(05)80338-5 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA TA766 UT WOS:A1995TA76600017 PM 8521108 ER PT J AU SUBRAMANIAN, S LIU, X STAMPS, RL SOORYAKUMAR, R PRINZ, GA AF SUBRAMANIAN, S LIU, X STAMPS, RL SOORYAKUMAR, R PRINZ, GA TI MAGNETIC ANISOTROPIES IN BODY-CENTERED-CUBIC COBALT FILMS SO PHYSICAL REVIEW B LA English DT Article ID THIN FERROMAGNETIC-FILMS; BRILLOUIN-SCATTERING; EPITAXIAL-GROWTH; BCC CO; SUPERLATTICES; MAGNONS; FE(110); LAYERS; GAAS; IRON AB The origin of magnetic anisotropies in thin bcc cobalt films is investigated using Brillouin light scattering. The in-plane directional and wave-vector dependence of surface and bulk magnon frequencies in (110) and (001) oriented films indicate a twofold anisotropy in these cubic ferromagnets with the easy axis of magnetization lying in plane along [001] and [100], respectively. Using elastic constants determined from phonon dispersion measurements, we argue that the observed uniaxial anisotropy can be largely accounted for by magnetoelastic interactions driven by lattice mismatch at the film/substrate interface. The easy axis is also evident by the transformation of the surface spin wave into the n=0 bulk magnon when the magnon wave vector lies parallel to the spontaneous (easy) axis of magnetization. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SUBRAMANIAN, S (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. RI Stamps, Robert/E-7304-2011 OI Stamps, Robert/0000-0003-0713-4864 NR 26 TC 29 Z9 29 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1995 VL 52 IS 14 BP 10194 EP 10201 DI 10.1103/PhysRevB.52.10194 PG 8 WC Physics, Condensed Matter SC Physics GA TA427 UT WOS:A1995TA42700057 ER PT J AU KENDZIORA, C ROSENBERG, A AF KENDZIORA, C ROSENBERG, A TI A-B PLANE ANISOTROPY OF THE SUPERCONDUCTING GAP IN BI2SR2CACU2O8+DELTA SO PHYSICAL REVIEW B LA English DT Note ID RAMAN-SCATTERING; SINGLE-CRYSTALS; ORDER-PARAMETER; TEMPERATURE; DEPENDENCE; PHONONS AB We report a-b plane electronic Raman scattering (ERS) measurements of superconducting Bi2Sr2CaCu2O8+delta single crystals with T(c)s ranging from 90 K down to 65 K on both sides of the doping curve. At low temperatures, a peak associated with the opening of a superconducting energy gap Delta(k) forms in the electronic Raman continuum. Polarization selection rules yield ERS sensitivity to k dependence and a clear anisotropy is observed. As the doping level is varied, anomalies in the observed continuum peak positions indicate that scattering in the B-1g symmetry is not a direct probe of Delta(k). RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 31 TC 74 Z9 74 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1995 VL 52 IS 14 BP R9867 EP R9870 DI 10.1103/PhysRevB.52.R9867 PG 4 WC Physics, Condensed Matter SC Physics GA TA427 UT WOS:A1995TA42700014 ER PT J AU PECORA, LM CARROLL, TL HEAGY, JF AF PECORA, LM CARROLL, TL HEAGY, JF TI STATISTICS FOR MATHEMATICAL PROPERTIES OF MAPS BETWEEN TIME-SERIES EMBEDDINGS SO PHYSICAL REVIEW E LA English DT Article ID STRANGE ATTRACTORS; CHAOTIC SIGNALS; NOISE-REDUCTION; SYNCHRONIZED CHAOS; MUTUAL INFORMATION; NONLINEAR-SYSTEMS; DIMENSION; DETERMINISM; CIRCUITS; FILTERS AB We develop a set of statistics which are intended to characterize in terms of probabilities or confidence levels whether two data sets are related by a mapping with certain mathematical properties. Given these statistics we can ask how confident we can be that the mapping is continuous, injective, differentiable, or has a differentiable inverse. The intended use is for experimental or numerical situations in which multiple time series are generated and one wants to know what relation exists among them, but the mapping between them is unknown or intractable. Examples of applications are testing filtered chaotic data for continuity and differentiability, testing two data sets for synchronization (in the most general sense), testing one data set for determinism forward and backward in time, and determining when transformations on two- or three-dimensional images are well behaved (diffeomorphisms). We test the statistics on several of these cases and show that they are useful for characterizing relations between data sets and for shedding light on phenomena which occur when data are transformed, for example, a dimension increase on filtering a chaotic data set. RP USN, RES LAB, CODE 6341, WASHINGTON, DC 20375 USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 75 TC 120 Z9 120 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1995 VL 52 IS 4 BP 3420 EP 3439 DI 10.1103/PhysRevE.52.3420 PN A PG 20 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TA523 UT WOS:A1995TA52300018 ER PT J AU OVERFELT, PL AF OVERFELT, PL TI FOCUS WAVE MODE SOLUTIONS OF THE INHOMOGENEOUS N-DIMENSIONAL SCALAR WAVE-EQUATION SO PHYSICAL REVIEW E LA English DT Article ID MAXWELL EQUATIONS; BOUNDARY-CONDITIONS; LOCALIZED WAVES AB In the following focus wave mode solutions of the inhomogeneous n-dimensional scalar wave equation are determined when the source term is of separable type (i.e., separable in the characteristic variables). In this case the n-dimensional inhomogeneous wave equation is transformed into a formally equivalent (n - 1)-dimensional inhomogeneous diffusion equation having a complex longitudinal space-time independent variable. The unbounded space propagator of this diffusion equation and the Palmer-Donnelly line source term generalized to n dimensions are used to obtain inhomogeneous wave equation solutions in two, three, and four space dimensions. Localization of these solutions is shown to increase as the dimensionality increases. An infinitely long line source with finite radius is also considered. As the source radius increases past a certain point, the localization and amplitude of the central peak decrease dramatically. RP OVERFELT, PL (reprint author), USN,CTR AIR WARFARE,DIV WEAP,DIV RES & TECHNOL,PHYS BRANCH,CHINA LAKE,CA 93555, USA. NR 25 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1995 VL 52 IS 4 BP 4387 EP 4392 DI 10.1103/PhysRevE.52.4387 PN B PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA TA525 UT WOS:A1995TA52500047 ER PT J AU ARONEN, JG CHRONISTER, RD AF ARONEN, JG CHRONISTER, RD TI ANTERIOR SHOULDER DISLOCATIONS - EASING REDUCTION BY USING LINEAR TRACTION TECHNIQUES SO PHYSICIAN AND SPORTSMEDICINE LA English DT Article AB The clinical diagnosis of anterior shoulder dislocations can be made by evaluating the mechanism of injury and noting limited arm adduction and shoulder rotation. In addition, the shoulder loses its normal rounded contour, and the acromion is unusually prominent. Prereduction x-rays are not always necessary but will confirm the clinical diagnosis. Reduction of the dislocation should be performed as quickly, gently, and safely as possible. Linear force via a self-reduction technique or a simple, passive traction technique will lead to a successful reduction in the vast majority of patients. C1 MARINE CORPS RECRUIT DEPOT,SPORTS MED CLIN,SAN DIEGO,CA. USN ACAD,ANNAPOLIS,MD 21402. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MCGRAW HILL HEALTHCARE PUBLICATIONS PI MINNEAPOLIS PA 4530 WEST 77TH ST, MINNEAPOLIS, MN 55435-5000 SN 0091-3847 J9 PHYSICIAN SPORTSMED JI Physician Sportsmed. PD OCT PY 1995 VL 23 IS 10 BP 65 EP 69 PG 5 WC Primary Health Care; Orthopedics; Sport Sciences SC General & Internal Medicine; Orthopedics; Sport Sciences GA RX795 UT WOS:A1995RX79500015 ER PT J AU SARPKAYA, T AF SARPKAYA, T TI TURBULENT VORTEX BREAKDOWN SO PHYSICS OF FLUIDS LA English DT Letter AB Reported herein is a cone-shaped turbulent vortex breakdown in noncavitating swirling flows at high Reynolds numbers in a slightly diverging cylindrical tube. The turbulent conical form is in addition to the well-known double-helix, spiral, and nearly axisymmetric or ''bubble''-type breakdowns. (C) 1995 American Institute of Physics. RP SARPKAYA, T (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 15 TC 53 Z9 53 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD OCT PY 1995 VL 7 IS 10 BP 2301 EP 2303 DI 10.1063/1.868742 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA RW579 UT WOS:A1995RW57900001 ER PT J AU LY, LN AF LY, LN TI A NUMERICAL COUPLED MODEL FOR STUDYING AIR-SEA-WAVE INTERACTION SO PHYSICS OF FLUIDS LA English DT Article ID BOUNDARY-LAYER; DRAG COEFFICIENT; MIXED-LAYER; TURBULENCE; OCEAN; DISSIPATION; INTERFACE; DYNAMICS AB A numerical coupled model of air-sea-wave interaction is developed to study the influence of ocean wind waves on dynamical, turbulent structures of the air-sea system and their impact on coupled modeling. The model equations for both atmospheric and oceanic boundary layers include equations for: (1) momentum, (2) a k-epsilon turbulence scheme, and (3) stratification in the atmospheric and oceanic boundary layers. The model equations are written in the same form for both the atmosphere and ocean. In this model, wind waves are considered as another source of turbulent energy in the upper layer of the ocean besides turbulent energy from shear production. The dissipation epsilon at the ocean surface is written as a linear combination of terms representing dissipation from mean flow and breaking waves. The epsilon from breaking waves is estimated by using similarity theory and observed data. It is written in terms of wave parameters such as wave phase speed, height, and length, which are then expressed in terms of friction velocity. Numerical experiments are designed for various geostrophic winds, wave heights, and wave ages, to study the influence of waves on the air-sea system. The numerical simulations show that the vertical profiles of epsilon in the atmospheric and oceanic boundary layers (AOBL) are similar. The magnitudes of epsilon in the oceanic surface zone are much larger than those in the atmospheric surface zone and in the interior of the oceanic boundary layer (OBL). The model predicts epsilon distributions with a surface zone of large dissipation which was not expected from similarity scaling based on observed wind stress and surface buoyancy. The simulations also show that waves have a strong influence on eddy viscosity coefficients (EVC) and momentum fluxes, and have a dominated effect on the component of fluxes in the direction of the wind. The depth of large changes in flux magnitudes and EVC in the ocean can reach to 10-20 m. The simulations of surface drift currents confirm that the currents are overestimated if the surface waves are not considered. (C) 1995 American Institute of Physics. RP LY, LN (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 38 TC 8 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD OCT PY 1995 VL 7 IS 10 BP 2396 EP 2406 DI 10.1063/1.868751 PG 11 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA RW579 UT WOS:A1995RW57900010 ER PT J AU WEBER, YS ORAN, ES BORIS, JP ANDERSON, JD AF WEBER, YS ORAN, ES BORIS, JP ANDERSON, JD TI THE NUMERICAL-SIMULATION OF SHOCK BIFURCATION NEAR THE END WALL OF A SHOCK-TUBE SO PHYSICS OF FLUIDS LA English DT Article AB The reflection of a normal shock wave from the end wall of a two-dimensional channel has been numerically simulated to investigate the unsteady, viscous interaction aspects of shock bifurcation. The numerical simulation implements a data-parallel version of the Flux-Corrected Transport algorithm that has been coupled to the viscous transport terms of the Navier-Stokes equations. All numerical simulations were performed on the Connection Machine, the CM-5. The results indicate that the shear layer in the bifurcation zone is unstable, and the large and small scale vortices lead to complex flow patterns. In addition, the high-speed, essentially inviscid flow, which is adjacent to the shear layer, is deflected over this region. As a result, weak shock and expansions waves are generated and a reattachment shock is formed at the trailing edge of the interaction region. The impact of heat transfer, Reynolds number, and incident shock strength on the viscous interaction is also investigated. Heat transfer to the walls weakens the interaction between the boundary layer and the reflected shock. However, the decreased Reynolds number and increased shock strength enhances the interaction. (C) 1995 American Institute of Physics. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. UNIV MARYLAND,DEPT AEROSP ENGN,COLLEGE PK,MD 20742. RP WEBER, YS (reprint author), USAF,WRIGHT LAB,WRIGHT PATTERSON AFB,OH 45433, USA. NR 31 TC 16 Z9 16 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD OCT PY 1995 VL 7 IS 10 BP 2475 EP 2488 DI 10.1063/1.868691 PG 14 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA RW579 UT WOS:A1995RW57900019 ER PT J AU GRINSTEIN, FF AF GRINSTEIN, FF TI SELF-INDUCED VORTEX RING DYNAMICS IN SUBSONIC RECTANGULAR JETS SO PHYSICS OF FLUIDS LA English DT Note ID SIMULATION AB The development in space and time of vortex rings in low aspect-ratio (AR) rectangular jets is investigated. By design, the present studies isolate the self-induced ring dynamics from effects of unsteady events otherwise present upstream and downstream of the rings in developed jets. The simulations show that the vortex rings undergo quite regular self-induced nonplanar deformations, approximately recovering their shape and flatness with axis rotated with respect to their initial configuration. The axis-rotation periods are in good agreement with previously reported data for pseudoelliptic rings, and exhibit nearly linear growth rate as a function of AR. For the larger aspect-ratio case studied (AR=4), bifurcation of the ring due to vortex reconnection into roughly round rings is observed, followed by collision of the split rings and a new reconnection process, suggesting pathways for transition to turbulence based on self-induced vortex deformations and reconnections. (C) 1995 American Institute of Physics. RP GRINSTEIN, FF (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,CODE 6410,WASHINGTON,DC 20375, USA. NR 13 TC 41 Z9 43 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD OCT PY 1995 VL 7 IS 10 BP 2519 EP 2521 DI 10.1063/1.868699 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA RW579 UT WOS:A1995RW57900027 ER PT J AU FREUND, HP ZAIDMAN, EG MANKOFSKY, A VANDERPLAATS, NR KODIS, MA AF FREUND, HP ZAIDMAN, EG MANKOFSKY, A VANDERPLAATS, NR KODIS, MA TI NONLINEAR-ANALYSIS OF HELIX TRAVELING-WAVE TUBES SO PHYSICS OF PLASMAS LA English DT Article ID OSCILLATORS AB A time-dependent nonlinear formulation of the interaction in the helix traveling wave tube is presented for a configuration in which an electron beam propagates through a sheath helix surrounded by a conducting wall. In order to describe both the variation in the wave dispersion and in the transverse inhomogeneity of the electromagnetic field with wave number, the field is represented as a superposition of waves in a vacuum sheath helix. An overall explicit sinusoidal variation of the form exp(ikz-i omega t) is assumed (where omega denotes the angular frequency corresponding to the wave number k in the vacuum sheath helix), and the polarization and radial variation of each wave is determined by the boundary conditions in a vacuum sheath helix. Thus, while the field is three-dimensional in nature, it is azimuthally symmetric. The propagation of each wave in vacuo as well as the interaction of each wave with the electron beam is included by allowing the amplitudes of the waves to vary in z and t. A dynamical equation for the field amplitudes is derived analogously to Poynting's equation, and solved in conjunction with the three-dimensional Lorentz force equations for an ensemble of electrons. Numerical examples are presented corresponding to both single- and multiwave interactions. (C) 1995 American Institute of Physics. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 26 TC 3 Z9 3 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1995 VL 2 IS 10 BP 3871 EP 3879 DI 10.1063/1.871086 PG 9 WC Physics, Fluids & Plasmas SC Physics GA RY424 UT WOS:A1995RY42400037 ER PT J AU WEBER, BV COMMISSO, RJ GOODRICH, PJ GROSSMANN, JM HINSHELWOOD, DD OTTINGER, PF SWANEKAMP, SB AF WEBER, BV COMMISSO, RJ GOODRICH, PJ GROSSMANN, JM HINSHELWOOD, DD OTTINGER, PF SWANEKAMP, SB TI PLASMA OPENING SWITCH CONDUCTION SCALING SO PHYSICS OF PLASMAS LA English DT Article ID DENSITY; STORAGE; MODEL AB Plasma opening switch (POS) experiments performed on the Hawk generator [Commisso et al., Phys. Fluids B 4, 2368 (1992)] (750 kA, 1.2 mu s) determine the dependence of the conduction current and conduction time on plasma density, electrode dimensions, and current rise rate. The experiments indicate that for a range of parameters, conduction is controlled by magnetohydrodynamic (MHD) distortion of the plasma, resulting in a low density region where opening can occur, possibly by erosion. The MHD distortion corresponds to an axial translation of the plasma center-of-mass by half the initial plasma length, leading to a simple scaling relation between the conduction current and time, and the injected plasma density and POS electrode dimensions that is applicable to a large number of POS experiments. For smaller currents and conduction times, the Hawk data suggest a non-MHD conduction limit that may correspond to electromagnetohydrodynamic (EMH) field penetration through the POS plasma. (C) 1995 American Institute of Physics. C1 JAYCOR,VIENNA,VA 22180. RP WEBER, BV (reprint author), USN,RES LAB,DIV PLASMA PHYS,PULSED POWER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 28 TC 34 Z9 37 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD OCT PY 1995 VL 2 IS 10 BP 3893 EP 3901 DI 10.1063/1.871018 PG 9 WC Physics, Fluids & Plasmas SC Physics GA RY424 UT WOS:A1995RY42400039 ER PT J AU SELTZER, MD AF SELTZER, MD TI INSTRUMENTAL CONSIDERATIONS FOR HIGH-SENSITIVITY CONTINUOUS EMISSIONS MONITORING OF HAZARDOUS AIR-POLLUTION METALS SO PROCESS CONTROL AND QUALITY LA English DT Article; Proceedings Paper CT 1994 Federation-of-Analytical-Chemistry-and-Spectroscopy-Societies Conference CY OCT 02-07, 1994 CL ST LOUIS, MO SP Federat Anal Chem & Spectroscopy Soc DE CONTINUOUS EMISSIONS MONITORING; HAZARDOUS AIR POLLUTANTS; HEAVY METALS; ATOMIC EMISSION SPECTROMETRY; INDUCTIVELY COUPLED PLASMA ID INDUCTIVELY COUPLED PLASMA; SPECTROMETRY; ELEMENT AB Inductively coupled plasma atomic emission spectrometry has been identified as the analytical technique that offers the best combination of speed and sensitivity for continuous emissions monitoring of hazardous air pollutant metals. Although the introduction of sample stream air into an inductively coupled argon plasma spectrometer is a relatively simple process requiring minimum modification of the instrument itself, optimization of both plasma operating conditions and detection parameters is fundamental to achieving the desired level of performance. The present paper outlines a strategy intended to maximize sensitivity and promote optimum operation of an inductively coupled argon plasma spectrometer under conditions brought about by the continuous introduction of sample stream air. RP SELTZER, MD (reprint author), USN,CTR AIR WARFARE,DIV WEAP,DIV RES & TECHNOL,CHINA LAKE,CA 93555, USA. NR 14 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0924-3089 J9 PROCESS CONTR QUAL JI Process Control Qual. PD OCT PY 1995 VL 7 IS 2 BP 71 EP 77 PG 7 WC Engineering, Chemical; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA TE270 UT WOS:A1995TE27000002 ER PT J AU DASCH, ML AF DASCH, ML TI HOSPITAL SETS NEW STANDARD AS CLOSURE APPROACHES - QUALITY IS CONTINUOUS SO QUALITY PROGRESS LA English DT Article RP DASCH, ML (reprint author), USN,ARMED FORCES MED INTELLIGENCE CTR,FT DETRICK,FREDERICK,MD, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC QUALITY CONTROL-ASQC PI MILWAUKEE PA ASQC MEMBERSHIP MANAGER 611 E. WISCONSIN AVENUE, MILWAUKEE, WI 53202 SN 0033-524X J9 QUAL PROG JI Qual. Prog. PD OCT PY 1995 VL 28 IS 10 BP 45 EP 48 PG 4 WC Engineering, Multidisciplinary; Engineering, Industrial; Management; Operations Research & Management Science SC Engineering; Business & Economics; Operations Research & Management Science GA RY851 UT WOS:A1995RY85100020 ER PT J AU KRUGER, J SHIFLER, DA SCANLON, JF MORAN, PJ AF KRUGER, J SHIFLER, DA SCANLON, JF MORAN, PJ TI THE PASSIVE BEHAVIOR OF METALS AND ALLOYS IN NEUTRAL NONAQUEOUS ORGANIC-SOLVENTS SO RUSSIAN JOURNAL OF ELECTROCHEMISTRY LA English DT Article ID PROPYLENE CARBONATE SOLUTIONS; STEEL; ELECTROPOLYMERIZATION; DIMETHOXYETHANE; IRON AB The major factor controlling the corrosion of metals and alloys in a given environment is the nature of the protective film. Although the phenomenon of passivity has been observed and characterized in aqueous solutions for over 200 years, the passive film on metals and alloys in nonaqueous, organic solutions is not well understood. Organic solutions are more complex than aqueous solutions and do not act as inert media. Our research, using various electrochemical and analytical methods, has provided an initial framework for the understanding of passivity in nonaqueous systems and how low levels of water contribute to, or interfere with this passivity. Iron, 1018 carbon steel, 304 stainless steel, nickel, and nickel 200 were examined in anhydrous (1 - 50 ppm water content), neutral, aprotic solutions of propylene carbonate (PC) and dimethoxyethane (DME) with a 0.5 molar supporting electrolyte concentration of either LiClO4 or LiAsF6. Small amounts of water (less than 1000 ppm) were added in some solutions to observe its effect on passivity or passivity breakdown. In our studies, metals and alloys can passivate in PC or DME solutions by: (a) air-formed oxide film, (b) chemisorption of the solvent, (c) salt film formation, or (d) electropolymerization of the solvent. Competition among the passivation processes determines the degree to which a metal will passivate and the stability of the passive state. The passivation mechanisms each have regions or conditions of stability that are functions of potential, solvent, electrolyte, salt solubility, interfacial kinetics, and impurities, such as water. If one passivation mechanism can dominate, stable passivity can be obtained. Under conditions where two or more mechanisms are operative, the compatibility and the kinetics of these processes will determine the stability of passivity. C1 ROCHESTER INST TECHNOL,DEPT MICROELECTR ENGN,ROCHESTER,NY 14623. USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. RP KRUGER, J (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. NR 14 TC 3 Z9 3 U1 0 U2 1 PU INTERPERIODICA PI BIRMINGHAM PA PO BOX 1831, BIRMINGHAM, AL 35201-1831 SN 1023-1935 J9 RUSS J ELECTROCHEM+ JI Russ. J. Electrochem. PD OCT PY 1995 VL 31 IS 10 BP 1004 EP 1008 PG 5 WC Electrochemistry SC Electrochemistry GA TE626 UT WOS:A1995TE62600002 ER PT J AU KOSTOFF, RN AF KOSTOFF, RN TI FEDERAL, RESEARCH IMPACT ASSESSMENT - AXIOMS, APPROACHES, APPLICATIONS SO SCIENTOMETRICS LA English DT Review AB This paper describes the practice of Federal research impact assessment. Evaluation of research impact is described for three cases: Research selection, where the work has not yet been performed; Research review, where work and results are ongoing; and Ex-post research assessment, where research has been completed and results can be tracked. Retrospective methods (such as projects Hindsight an TRACES), qualitative methods (such as peer review), and quantitative methods (such as cost-benefit analysis and bibliometrics) are described. While peer review in its broadest sense is the most widely used method in research selection, review, and ex-post assessment, it has its deficiencies, and there is no single method which provides a complete impact evaluation. RP OFF NAVAL RES, 800 N QUINCY ST, ARLINGTON, VA 22217 USA. NR 110 TC 20 Z9 20 U1 1 U2 8 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0138-9130 EI 1588-2861 J9 SCIENTOMETRICS JI Scientometrics PD OCT PY 1995 VL 34 IS 2 BP 163 EP 206 DI 10.1007/BF02020420 PG 44 WC Computer Science, Interdisciplinary Applications; Information Science & Library Science SC Computer Science; Information Science & Library Science GA TH590 UT WOS:A1995TH59000003 ER PT J AU CHRISTIAN, DK BERGH, JO THOMAS, ED AF CHRISTIAN, DK BERGH, JO THOMAS, ED TI DECHLORINATION EQUIPMENT FOR SHIPBOARD POLLUTION PREVENTION SO SEA TECHNOLOGY LA English DT Article C1 USN,RES LAB,ENVIRONM EFFECTS BRANCH,WASHINGTON,DC. RP CHRISTIAN, DK (reprint author), ARINC INC,WASHINGTON,DC, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU COMPASS PUBL INC PI ARLINGTON PA SUITE 1000 1117 N 19 ST, ARLINGTON, VA 22209 SN 0093-3651 J9 SEA TECHNOL JI Sea Technol. PD OCT PY 1995 VL 36 IS 10 BP 51 EP & PG 0 WC Engineering, Ocean SC Engineering GA TA305 UT WOS:A1995TA30500009 ER PT J AU SHRIVERLAKE, LC GOLDEN, JP PATONAY, G NARAYANAN, N LIGLER, FS AF SHRIVERLAKE, LC GOLDEN, JP PATONAY, G NARAYANAN, N LIGLER, FS TI USE OF 3 LONGER-WAVELENGTH FLUOROPHORES WITH THE FIBEROPTIC BIOSENSOR SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article; Proceedings Paper CT 2nd European Conference on Optical Chemical Sensors and Biosensors (EUROPT(R)ODE II) CY APR 19-21, 1994 CL FLORENCE, ITALY DE FIBEROPTIC BIOSENSORS; FLUOROPHORES ID DYE LABELING REAGENTS; SUCCINIMIDYL ESTERS; CYANINE AB With the availability of fluorescent dyes that are excited above 600 nm and couple easily to proteins, portable biosensors are becoming a reality. The use of diode lasers to excite these dyes permits systems to be made small and lightweight. An added benefit to switching to the near-infrared (NIR) regime is the reduction in background fluorescence from environmental and clinical samples. Previously, an evanescent wave biosensor was developed at the Naval Research Laboratory (NRL) using tetramethylrhodamine isothiocyanate as the fluorescent tag. Using this biosensor, toxins and other proteins have been detected down to 1 ng ml(-1) and bacteria to 3000 cells ml(-1). In this study, two new biosensors have been constructed using the same design with only selected components changed for detection of other fluorophores. An antigen (goat IgG) is labelled with one of three fluorophores: tetramethylrhodamine isothiocyanate, Cy5 and a near-infrared dye. The direct binding of each labelled antigen to an antibody-coated fiber-optic probe is measured. Comparisons of signal magnitudes, level of detection achieved, and photobleaching have been performed. C1 GEORGIA STATE UNIV,DEPT CHEM,ATLANTA,GA 30303. RP SHRIVERLAKE, LC (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. NR 13 TC 13 Z9 13 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD OCT PY 1995 VL 29 IS 1-3 BP 25 EP 30 DI 10.1016/0925-4005(95)01659-7 PG 6 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA TD753 UT WOS:A1995TD75300005 ER PT J AU RABBANY, SY KUSTERBECK, AW BREDEHORST, R LIGLER, FS AF RABBANY, SY KUSTERBECK, AW BREDEHORST, R LIGLER, FS TI BINDING-KINETICS OF IMMOBILIZED ANTIBODIES IN A FLOW IMMUNOSENSOR SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article; Proceedings Paper CT 2nd European Conference on Optical Chemical Sensors and Biosensors (EUROPT(R)ODE II) CY APR 19-21, 1994 CL FLORENCE, ITALY DE FLOW IMMUNOSENSORS; IMMOBILIZED ANTIBODIES AB This study investigates the binding kinetics of immobilized antibody in a solid-phase displacement immunosensor conducted in flow under nonequilibrium conditions. The experimental system studied employs a monoclonal antibody, specific for cocaine and its metabolite, benzoylecgonine, immobilized onto agarose beads. After saturation of antibody binding sites with the fluorophore-labeled antigen, fluorescein-cadaverine-benzoylecgonine, the system is placed in a buffer Bow. Injection of unlabeled antigen causes displacement of proportional amounts of antibody-bound labeled antigen, which is detected downstream. Using a repetitive displacement technique, we have characterized the kinetics by determining the displacement efficiency and apparent dissociation constant at various flow rates and different antibody surface densities. The experiments were performed with several antigen concentrations to evaluate the reliability of the repetitive displacement technique. The amount of displaced labeled antigen was found to be a function of both the density of antibody-bound labeled antigen and the amount of injected unlabeled antigen. Upon repetitive sample injections, an exponential decrease of displaced labeled antigen is observed, corresponding to a similar decrease in the undissociated fraction. Further kinetics analysis reveals that the displacement efficiency is dependent on the Bow rate and the antibody surface density. The antibody immobilized at low density is much more sensitive to changes in the flow rate than the antibody immobilized at high density, as indicated by the decrease in the displacement efficiency and increase in the apparent dissociation constant (k(d)) with the increase in Bow rate. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. HOFSTRA UNIV,BIOENGN PROGRAM,HEMPSTEAD,NY 11550. UNIV HAMBURG,DEPT BIOCHEM & MOLEC BIOL,D-20146 HAMBURG,GERMANY. NR 10 TC 15 Z9 15 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD OCT PY 1995 VL 29 IS 1-3 BP 72 EP 78 DI 10.1016/0925-4005(95)01665-1 PG 7 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA TD753 UT WOS:A1995TD75300011 ER PT J AU PITMAN, KT COSTANTINO, PD LASSEN, LF AF PITMAN, KT COSTANTINO, PD LASSEN, LF TI SINONASAL UNDIFFERENTIATED CARCINOMA - CURRENT TRENDS IN TREATMENT SO SKULL BASE SURGERY LA English DT Note ID ANTERIOR SKULL BASE; AGGRESSIVE NEOPLASM; RESECTION AB Sinonasal undifferentiated carcinoma (SNUG) is a rare and highly aggressive neoplasm of the paranasal sinuses, which has recently been characterized as a distinct pathologic entity. The prognosis for patients with SNUG is poor. Early case reports describe patients with lesions that were clinically advanced at initial presentation and surgically unresectable. Survival was reported in months after treatment with chemotherapy and radiation. As more experience was gained with treatment of SNUG, it was found that aggressive, combined surgical therapy of lesions previously considered unresectable has shown increased survival. We report a case of a 38-year-old man with SNUG originating in the posterior ethmoid, extending into the anterior cranial fossa and orbit, who was treated with preoperative hyperfractionated radiation therapy, chemotherapy, and craniofacial resection. RP PITMAN, KT (reprint author), USN,MED CTR,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23709, USA. NR 18 TC 13 Z9 13 U1 0 U2 0 PU THIEME MEDICAL PUBL INC PI NEW YORK PA 381 PARK AVE SOUTH, NEW YORK, NY 10016 SN 1052-1453 J9 SKULL BASE SURG JI Skull Base Surg. PD OCT PY 1995 VL 5 IS 4 BP 269 EP 272 DI 10.1055/s-2008-1058925 PG 4 WC Clinical Neurology; Otorhinolaryngology; Surgery SC Neurosciences & Neurology; Otorhinolaryngology; Surgery GA TE972 UT WOS:A1995TE97200011 PM 17170968 ER PT J AU KEENAN, FP GREER, CJ FOSTER, VJ WIDING, KG AF KEENAN, FP GREER, CJ FOSTER, VJ WIDING, KG TI EMISSION-LINE RATIOS FOR SI-XI APPLICABLE TO CDS/SUMER OBSERVATIONS FROM SOHO SO SOLAR PHYSICS LA English DT Article ID BE-LIKE IONS; COLLISION STRENGTHS; SOLAR-FLARES; SPECTRUM; SEQUENCE AB Calculations of electron temperature (T-e) and density (N-e) sensitive line ratios in Si XI involving transitions in the similar to 358-604 Angstrom wavelength range are presented. These are shown in the form of ratio-ratio diagrams, which should in principle allow both N-e and T-e to be deduced for the Si XI line-emitting region of a plasma. However a comparison of these with observational data for two solar flares, obtained with the Naval Research Laboratory's S082A spectrograph on board Skylab, reveals that the experimental ratios are much larger than expected from theory, which is probably due to the Si XI lines in the S082A spectra being blended with transitions from species including Ne V, Fe XI, and Fe XII. Possible future applications of the Si XI results to spectral data from the Coronal Diagnostic Spectrometer on the Solar and Heliospheric Observatory are briefly discussed. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 23 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD OCT PY 1995 VL 161 IS 1 BP 159 EP 164 DI 10.1007/BF00732090 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TC196 UT WOS:A1995TC19600011 ER PT J AU RAMACHANDRAN, JS BHAGAT, SM PENG, JL RUBINSTEIN, M AF RAMACHANDRAN, JS BHAGAT, SM PENG, JL RUBINSTEIN, M TI FMR OF POWDER LA0.7CA0.3MNO3 SO SOLID STATE COMMUNICATIONS LA English DT Article DE MAGNETICALLY ORDERED MATERIALS; TRANSPORT; RESONANCE AB We report the observation of ferromagnetic antiresonance and resonance in powder La0.7Ca0.3MnO3 at microwave frequencies of 22 GHz, 32 GHz and 36 GHz in the temperature range 77K - 350 K. Using different grain sizes we are able to place an upper limit on the resistivity of the grain and estimate the grain resistivity rho(grain) less than or equal to Im Omega cm in the neighbourhood of the peak resistivity where the reported bulk resistivity values are rho(bulk) approximate to 20 m Omega cm - 50 m Omega cm. This indicates that the grains appear to be at least an order of magnitude more conducting than the bulk. C1 UNIV MARYLAND,CTR SUPERCONDUCT RES,COLLEGE PK,MD 20742. USN,RES LAB,WASHINGTON,DC 20375. RP RAMACHANDRAN, JS (reprint author), UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742, USA. NR 9 TC 34 Z9 34 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD OCT PY 1995 VL 96 IS 3 BP 127 EP 131 DI 10.1016/0038-1098(95)00413-0 PG 5 WC Physics, Condensed Matter SC Physics GA RT671 UT WOS:A1995RT67100003 ER PT J AU KRUPPA, W BOOS, JB AF KRUPPA, W BOOS, JB TI DEEP-LEVEL TRAPPING IN ION-IMPLANTED INP JFETS SO SOLID-STATE ELECTRONICS LA English DT Review ID X-GREATER-THAN-0.53 IN0.52AL0.48AS/INXGA1-XAS HEMTS; GAAS-MESFETS; FREQUENCY DISPERSION; TRANSCONDUCTANCE; TRAPS; CONDUCTANCE; ADMITTANCE AB The trapping mechanisms which cause low-frequency transconductance and output resistance dispersion in ion-implanted InP JFETs are examined. The trapping activity at room temperature occurs primarily between 100 Hi and 1 MHz and is caused by electron traps located at the access region surface and in the substrate below the channel. By monitoring the characteristic frequencies of the dispersion as a function of temperature, the activation energies of the traps were determined. The trapping mechanism responsible for the low-field transconductance dispersion appears to be a surface state with an activation energy of 0.28 eV. The output resistance dispersion indicates several traps with major ones at 0.44 and 0.55 eV at operating bias. Low-frequency noise peaks caused by the traps were found to be consistent with the dispersion measurements. After subtracting the trap Lorentzian contributions, the Hooge parameter was found to be 4 x 10(-4). C1 SFA INC,LANDOVER,MD 20785. RP KRUPPA, W (reprint author), USN,RES LAB,CODE 6856,WASHINGTON,DC 20375, USA. NR 28 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD OCT PY 1995 VL 38 IS 10 BP 1735 EP 1741 DI 10.1016/0038-1101(95)00073-3 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA RV657 UT WOS:A1995RV65700001 ER PT J AU ALI, F CHADWICK, AV GREAVES, GN JERMY, MC NGAI, KL SMITH, ME AF ALI, F CHADWICK, AV GREAVES, GN JERMY, MC NGAI, KL SMITH, ME TI EXAMINATION OF THE MIXED-ALKALI EFFECT IN (LI,NA) DISILICATE GLASSES BY NUCLEAR-MAGNETIC-RESONANCE AND CONDUCTIVITY MEASUREMENTS SO SOLID STATE NUCLEAR MAGNETIC RESONANCE LA English DT Article DE GLASSES; SI-29 NUCLEAR MAGNETIC RESONANCE; NA-23 NUCLEAR MAGNETIC RESONANCE; LI-7 NUCLEAR MAGNETIC RESONANCE; ELECTRICAL CONDUCTIVITY; MAGIC-ANGLE SPINNING; ALKALI DISILICATES; MIXED-ALKALI EFFECT ID SOLID-STATE NMR; SILICATE-GLASSES; KOHLRAUSCH EXPONENT; IONIC-CONDUCTIVITY; RELAXATION MODEL; SPIN RELAXATION; MAS-NMR; MOTION AB Results from Si-29, Na-23 and Li-7 magic-angle spinning nuclear magnetic resonance (NMR) spectroscopy, Li-7 NMR relaxation and electrical conductivity in a series of [Li-(1-x). Na-x]O-2 . 2SiO(2) (disilicate) glasses are used to investigate the mixed-alkali effect. From the Si-29 NMR spectra there is relatively little change of the network with alkali composition. Na-23 and Li-7 NMR linewidths and shifts change continuously as a function of composition, indicating that the alkali ions are intimately and uniformly mixed rather than separated into lithium and sodium-rich domains. The activation energy from electrical conductivity shows a distinct maximum at the central composition (x = 0.5), whereas the local activation energy for lithium motion determined from NMR shows only a smaller but monotonic increase as the lithium-content decreases. C1 UNIV KENT,PHYS LAB,CANTERBURY CT2 7NR,KENT,ENGLAND. UNIV KENT,CHEM LAB,CANTERBURY CT2 7NH,KENT,ENGLAND. DARESBURY LAB,DRAL,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. USN,RES LAB,WASHINGTON,DC 20375. NR 35 TC 37 Z9 37 U1 0 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-2040 J9 SOLID STATE NUCL MAG JI Solid State Nucl. Magn. Reson. PD OCT PY 1995 VL 5 IS 1 BP 133 EP 143 DI 10.1016/0926-2040(95)00033-M PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy SC Chemistry; Physics; Spectroscopy GA TA304 UT WOS:A1995TA30400013 PM 8748651 ER PT J AU LOWREY, AH FAMINI, GR AF LOWREY, AH FAMINI, GR TI USING THEORETICAL DESCRIPTORS IN QUANTITATIVE STRUCTURE-ACTIVITY-RELATIONSHIPS - HPLC CAPACITY FACTORS FOR ENERGETIC MATERIALS SO STRUCTURAL CHEMISTRY LA English DT Article DE EXPLOSIVES; SOLVATION; COMPUTATIONAL CHEMISTRY; CHROMATOGRAPHY; QSAR ID EXPLOSIVES AB The widespread application of computational techniques to studies in biology and chemistry has led to a quest for important characteristic properties that may be directly derived from these methods. The theoretical linear solvation energy relationships (TLSER) have successfully replaced empirical parameters, such as in the linear solvation energy relationships (LSER) of Kamlet and Taft, with theoretical descriptors that are consistently derived for a wide variety of chemical and biological properties and for a large range of molecules. These descriptors are small in number, well-defined in theoretical terms, and provide a systematic basis for computational studies of complex phenomena. Energetic materials are a class of molecules whose explosive characteristics have been previously studied by empirical methods. The forensic and environmental sciences have prompted the conduct of detailed high performance liquid chromatography (HPLC) studies for identifying of trace quantities of commonly used explosives. The TLSER methodology provides good correlations between the calculated quantities and the experimentally determined HPLC capacity factors. This provides a reasonable interpretation of retention times in terms of molecular volume and quantities associated with acidity and basicity. C1 USA,EDGEWOOD RES DEV & ENGN CTR,ABERDEEN PROVING GROUND,MD. RP LOWREY, AH (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 30 TC 13 Z9 13 U1 1 U2 5 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 1040-0400 J9 STRUCT CHEM JI Struct. Chem. PD OCT PY 1995 VL 6 IS 4-5 BP 357 EP 365 DI 10.1007/BF02293131 PG 9 WC Chemistry, Multidisciplinary; Chemistry, Physical; Crystallography SC Chemistry; Crystallography GA TA172 UT WOS:A1995TA17200019 ER PT J AU THOMPSON, WT AF THOMPSON, WT TI NUMERICAL SIMULATIONS OF THE LIFE-CYCLE OF A BAROCLINIC WAVE SO TELLUS SERIES A-DYNAMIC METEOROLOGY AND OCEANOGRAPHY LA English DT Article ID EXTRATROPICAL MARINE CYCLONE; EVOLUTION; MODEL AB A new conceptual visualization of cyclone-frontal evolution is presented by Shapiro and Keyser (1990). The primary differences between this model and the classical Norwegian frontal cyclone model are the absence of an occlusion, the presence of a warm-core seclusion, and the ''bent back'' warm front or westward extension of the warm front. In the present study, a mesoscale numerical model is used to investigate the kinematics and structural features of the bent back warm front. Simulations are performed using a 2nd-order closure turbulence parameterization with a sophisticated surface layer similarity scheme. The adiabatic and inviscid case is also examined. Results show that the seclusion and bent back warm front are present in both the adiabatic and inviscid case and using the 2nd-order closure parameterization. An occlusion also forms in later stages in both cases, indicating that the absence of an occlusion in the original publication of the Shapiro and Keyser model is a shortcoming. The results also show that, while the adiabatic components of the flow are responsible for creating the important features of cyclogenesis and Frontogenesis, diabatic physical processes exert a strong influence on the ultimate cyclone/frontal structure. Sensitivity studies are performed in order to further investigate this issue. RP USN, RES LAB, DIV MARINE METEOROL, 7 GRACE HOPPER AVE, MONTEREY, CA 93943 USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU CO-ACTION PUBLISHING PI JARFALLA PA RIPVAGEN 7, JARFALLA, SE-175 64, SWEDEN SN 0280-6495 EI 1600-0870 J9 TELLUS A JI Tellus Ser. A-Dyn. Meteorol. Oceanol. PD OCT PY 1995 VL 47 IS 5 BP 722 EP 732 DI 10.1034/j.1600-0870.1995.00115.x PN 1 PG 11 WC Meteorology & Atmospheric Sciences; Oceanography SC Meteorology & Atmospheric Sciences; Oceanography GA TG673 UT WOS:A1995TG67300015 ER PT J AU HIRSCHBERG, PA DOYLE, JD AF HIRSCHBERG, PA DOYLE, JD TI AN EXAMINATION OF PRESSURE TENDENCY MECHANISMS IN AN IDEALIZED SIMULATION OF EXTRATROPICAL CYCLOGENESIS SO TELLUS SERIES A-DYNAMIC METEOROLOGY AND OCEANOGRAPHY LA English DT Article; Proceedings Paper CT International Symposium on the Life Cycles of Extratropical Cyclones CY JUN 27-JUL 01, 1994 CL BERGEN, NORWAY ID EASTERN-UNITED-STATES; TROPOPAUSE UNDULATIONS; HEIGHT TENDENCY; CYCLONE EVENT; MODEL; CIRCULATION; DIAGNOSIS AB A numerical simulation of idealized Type-A extratropical cyclogenesis is used to examine pressure tendency mechanisms following a surface low center through its evolution. it is found that horizontal density advection, which maximizes near a developing tropopause undulation (potential vorticity anomaly). is the primary mechanism by which the density and hydrostatic pressure is reduced in the column above the developing surface low center. The density and pressure tendencies associated with horizontal velocity divergence and vertical mass divergence are an order of magnitude larger than the horizontal advective tendencies but are of opposite sign and lend to offset each other. The residual tendencies that result from combining the horizontal velocity divergence and vertical mass divergence are associated with positive density and pressure tendencies that generally oppose but do not counteract the negative tendencies produced by upper-level horizontal advection until late in the evolution of the cyclone. However, this residual divergence is the primary mechanism for the generation of the upstream low density warm pool over the low portion of the tropopause undulation that is later advected over the surface low. In general, these results are consistent with historical as well as more recent studies that suggest the importance of tropopause-level temperature advection in the promotion of the observed height tendency patterns accompanying the superposition of tropopause- and groundbased potential vorticity anomalies during Type B cyclogenesis. From a hydrostatic tendency perspective, it is concluded that baroclinic instability is a process whereby low density, warm air especially above the tropopause that has formed owing to divergence and vertical motion effects is advected downstream and over low-level baroclinic zones and nascent cyclones. In this framework, Type B is distinguished from Type A cyclogenesis by the existence of an initial reservoir of low density, warm, air above a tropopause undulation prior to surface cyclogenesis. C1 USN,RES LAB,DIV MARINE METEOROL,MONTEREY,CA 93943. RP HIRSCHBERG, PA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-HS,589 DYER RD,ROOM 254,MONTEREY,CA 93943, USA. NR 34 TC 1 Z9 1 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0280-6495 J9 TELLUS A JI Tellus Ser. A-Dyn. Meteorol. Oceanol. PD OCT PY 1995 VL 47 IS 5 BP 747 EP 758 DI 10.1034/j.1600-0870.1995.00117.x PN 1 PG 12 WC Meteorology & Atmospheric Sciences; Oceanography SC Meteorology & Atmospheric Sciences; Oceanography GA TG673 UT WOS:A1995TG67300017 ER PT J AU DOYLE, JD AF DOYLE, JD TI COUPLED OCEAN WAVE/ATMOSPHERE MESOSCALE MODEL SIMULATIONS OF CYCLOGENESIS SO TELLUS SERIES A-DYNAMIC METEOROLOGY AND OCEANOGRAPHY LA English DT Article ID RAPID CYCLOGENESIS; SEA; DRAG; WIND; ROUGHNESS; CYCLONE; WAVES; CIRCULATION; EVOLUTION; STRESS AB The impact of wind-generated ocean waves upon the structure and evolution of an idealized cyclone is investigated. High-resolution numerical experiments were performed with a constant surface roughness, roughness length from Charnock's formula, and from a coupled ocean-wave/atmosphere mesoscale model. Results indicate that young ocean waves increase the effective surface roughness, increase the surface stress, significantly decrease the 10-m wind speeds and modulate the heat and moisture transport between the atmosphere and ocean. These effects are maximized along the warm front and to the rear of the cyclone near the southwestern quadrant. As a result of this boundary layer modification, the mesoscale structures associated with the cyclone are perturbed. Regions of young windsea act to locally enhance the low-level frontogenesis, convergence and rainfall. Roughness effects associated with ocean waves modulate the deepening rate during rapid cyclogenesis and enhance the cyclone filling process. Kinetic energy of the entire cyclone system is reduced significantly near the surface and by 3-8 % above the boundary layer as a result of enhanced roughness associated with young ocean waves. RP USN, RES LAB, DIV MARINE METEOROL, 7 GRACE HOPPER AVE, MONTEREY, CA 93943 USA. NR 38 TC 38 Z9 40 U1 0 U2 2 PU CO-ACTION PUBLISHING PI JARFALLA PA RIPVAGEN 7, JARFALLA, SE-175 64, SWEDEN SN 0280-6495 EI 1600-0870 J9 TELLUS A JI Tellus Ser. A-Dyn. Meteorol. Oceanol. PD OCT PY 1995 VL 47 IS 5 BP 766 EP 778 DI 10.1034/j.1600-0870.1995.00119.x PN 1 PG 13 WC Meteorology & Atmospheric Sciences; Oceanography SC Meteorology & Atmospheric Sciences; Oceanography GA TG673 UT WOS:A1995TG67300019 ER PT J AU NEWMAN, AH KLINE, RH ALLEN, AC IZENWASSER, S GEORGE, C KATZ, JL AF NEWMAN, AH KLINE, RH ALLEN, AC IZENWASSER, S GEORGE, C KATZ, JL TI NOVEL 4'-SUBSTITUTED AND 4',4''-DISUBSTITUTED 3-ALPHA-(DIPHENYLMETHOXY)TROPANE ANALOGS AS POTENT AND SELECTIVE DOPAMINE UPTAKE INHIBITORS SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID COCAINE RECEPTOR; RAT STRIATUM; UPTAKE SITES; BINDING; AFFINITY; ANTAGONIST; BRAIN AB A series of 4'-substituted and 4',4 ''-disubstituted 3 alpha-(diphenylmethoxy)tropane analogs were prepared as novel probes for the dopamine transporter. These compounds were evaluated in radiolabeled binding assays for the dopamine, norepinephrine, and serotonin transporters. All of these compounds monophasically displaced [H-3]WIN 35,428 binding in rat caudate putamen with Ki values ranging from 11.8 to 2000 nM. The most potent compound in this series was 4',4 ''-difluoro 3 alpha-(diphenylmethoxy)tropane 7c with a K-i = 11.8 nM. All of the compounds inhibited dopamine uptake in rat caudate putamen (IC50 = 24-4456 nM) which correlated significantly (r = 0.907;p > 0.0001) with binding affinities at the dopamine transporter. None of the compounds demonstrated high-affinity binding at the norepinephrine (K-i > 4800 nM) or serotonin (K-i > 690 nM) transporters. Therefore, the most potent dopamine uptake inhibitors in this series were highly selective for the dopamine transporter. Preliminary behavioral studies of several of these analogs (7a-e) suggested that the compounds did not display a cocaine-like behavioral profile, despite their ability to inhibit dopamine uptake. The present data coupled with the observed differences from cocaine in structure-activity relationships suggested that the 3 alpha-(diphenylmethoxy)tropane analogs may be interacting at a different active site than cocaine on the dopamine transporter and that an additional binding domain might be exploited for the identification of potential therapeutics for the treatment of cocaine abuse. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP NEWMAN, AH (reprint author), NIDA,DIV INTRAMURAL RES,PSYCHOBIOL SECT,BOX 5180,BALTIMORE,MD 21224, USA. RI Izenwasser, Sari/G-9193-2012 NR 36 TC 95 Z9 97 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD SEP 29 PY 1995 VL 38 IS 20 BP 3933 EP 3940 DI 10.1021/jm00020a006 PG 8 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA RY255 UT WOS:A1995RY25500006 PM 7562926 ER PT J AU GOPALAKRISHNAN, GK WILLIAMS, KJ MOELLER, RP BURNS, WK ESMAN, RD AF GOPALAKRISHNAN, GK WILLIAMS, KJ MOELLER, RP BURNS, WK ESMAN, RD TI FIBEROPTIC LINK ARCHITECTURE FOR MICROWAVE SUBCARRIER TRANSMISSION AND RECEPTION SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL CONTROL OF MICROWAVES; SUBCARRIER MULTIPLEXING ID GHZ AB A novel fibre-optic system using subcarrier transmission and reception of microwave signals is demonstrated. Error free transmission of a 50Mbit/s amplitude shift keyed signal over 9 and 16GHz microwave subcarriers is demonstrated for received optical powers greater than or equal to -30.5 and -28.5dBm, respectively. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GOPALAKRISHNAN, GK (reprint author), MARYLAND DEV LAB,GREENBELT,MD 20770, USA. NR 10 TC 6 Z9 6 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 28 PY 1995 VL 31 IS 20 BP 1764 EP 1765 DI 10.1049/el:19951174 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA RY742 UT WOS:A1995RY74200042 ER PT J AU RUCKMAN, CE FULLER, CR AF RUCKMAN, CE FULLER, CR TI OPTIMIZING ACTUATOR LOCATIONS IN ACTIVE NOISE-CONTROL SYSTEMS USING SUBSET-SELECTION SO JOURNAL OF SOUND AND VIBRATION LA English DT Article ID RADIATION; PLATES AB This numerical simulation uses multiple linear regression with subset selection to optimize the locations of control actuators in a feedforward active noise control system. By formulating the feedforward control problem as a regression, subset selection can find the actuator locations that provide the best system performance. Subset selection provides benefits over continuous optimization approaches because of its computational efficiency; subset selection can examine systems for which the system response is expensive to compute, such as fluid-structure interaction problems, and can efficiently optimize large numbers of actuators. This paper describes a method for exhaustive-search subset selection, and provides numerical results for a simple active structural-acoustic control problem. (C) 1995 Academic Press Limited C1 VIRGINIA POLYTECH INST & STATE UNIV, VIBRAT & ACOUST LABS, BLACKSBURG, VA 24061 USA. RP USN, CTR SURFACE WARFARE, CARDEROCK DIV, STRUCT ACOUST & HYDROACOUST RES BRANCH, BETHESDA, MD 20084 USA. NR 24 TC 18 Z9 21 U1 0 U2 1 PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0022-460X EI 1095-8568 J9 J SOUND VIB JI J. Sound Vibr. PD SEP 28 PY 1995 VL 186 IS 3 BP 395 EP 406 DI 10.1006/jsvi.1995.0458 PG 12 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA RY612 UT WOS:A1995RY61200003 ER PT J AU KARLE, IL GURUNATH, R PRASAD, S KAUL, R RAO, RB BALARAM, P AF KARLE, IL GURUNATH, R PRASAD, S KAUL, R RAO, RB BALARAM, P TI PEPTIDE DESIGN - STRUCTURAL EVALUATION OF POTENTIAL NONHELICAL SEGMENTS ATTACHED TO HELICAL MODULES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ALPHA-AMINOISOBUTYRIC-ACID; SYNTHETIC PROTEIN MIMICS; X-RAY-DIFFRACTION; LEU-AIB-OME; AMINO-ACIDS; DIALKYLATED GLYCINES; CRYSTAL-STRUCTURE; APOLAR; HYDRATION; STEREOCHEMISTRY AB The conformations of three decapeptides containing a helical heptapeptide module attached to a potentially helix destabilizing tripeptide segment have been investigated in single crystals. X-ray diffraction studies of the sequence Boc-Gly-Dpg-Xxx-Val-Ala-Leu-Aib-Val-Ala-Leu-OMe (Xxx = Leu (1), Pro (2), and Ala (3); Dpg alpha,alpha-di-n-propylglycine; Aib = alpha-aminoisobutyric acid) reveal helical conformations for the segment 2-9 in all three peptides. In 1 and 2 Gly(1) is not accommodated in the right-handed helix and adopts a left-handed helical conformation with positive phi, psi values. The terminal blocking group extends away from the helix in 1 and 2. In 3 the helix is continuous, encompassing residues 1-9. The Dpg residues in all three cases adopt helical conformations, even when flanked by two helix destabilizing residues as in 2. These findings suggest that the higher alpha,alpha-dialkyl residues are good helix promoters although theoretical calculations suggest the existence of a pronounced energy minimum in fully extended regions of conformational space. None of the peptides pack efficiently. The register between helices in the head-to-tail region is not good, with disordered water molecules serving as hydrogen bond bridges and as space fillers. The crystallographic parameters follow. 1: Xxx = Leu, C54H98N10O13. 2H(2)O . C3H7OH, P2(1)2(1)2(1), a = 16.399(3) Angstrom, b = 18.634(3) Angstrom, c = 23.241(4) Angstrom. 2: Xxx = Pro, C53H94N10O13. xH(2)O, P2(1)2(1)2(1), a = 16.468(4) Angstrom, b = 18.071(4) Angstrom, c = 23.397(5) Angstrom. 3: Xxx = Ala, C51H92N10O13. xH(2)O, P2(1)2(1)2, a = 19.289(7) Angstrom, b = 35.950(12) Angstrom, c = 9.570(3) Angstrom. C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. BANARAS HINDU UNIV,DEPT CHEM,VARANASI 221005,UTTAR PRADESH,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. RI Ramanathan, Gurunath/B-4757-2011 OI Ramanathan, Gurunath/0000-0003-4627-1677 NR 40 TC 34 Z9 34 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 27 PY 1995 VL 117 IS 38 BP 9632 EP 9637 DI 10.1021/ja00143a003 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA RX712 UT WOS:A1995RX71200003 ER PT J AU WEIMER, RA THORPE, TP SNAIL, KA MERZBACHER, CE AF WEIMER, RA THORPE, TP SNAIL, KA MERZBACHER, CE TI EFFECTS OF HYDROGEN ADDITION AND GROWTH-ETCH CYCLING ON THE OXY-ACETYLENE TORCH DEPOSITION OF HOMOEPITAXIAL DIAMOND SO APPLIED PHYSICS LETTERS LA English DT Article AB Homoepitaxial diamond films were deposited onto (110) single crystal substrates using oxy-acetylene torch deposition at a constant substrate temperature of 1150 degrees C. Growth-etch cycling of the deposition increased the linear growth rates of the (100) and (111) faces by a factor of 2. The growth-etch films were shown to be less transparent in the infrared than the reference depositions as determined by microfocus Fourier transform infrared spectroscopy. Using the growth-etch technique, the growth rates of the (100), (111), and (110) faces decreased with increasing hydrogen addition to the combustion flame for hydrogen flow rates up to 50% of the acetylene flow rate. The additional hydrogen did not improve the growth-etch films' transparency. (C) 1995 American Institute of Physics. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. NR 7 TC 2 Z9 2 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 25 PY 1995 VL 67 IS 13 BP 1839 EP 1840 DI 10.1063/1.115420 PG 2 WC Physics, Applied SC Physics GA RW225 UT WOS:A1995RW22500015 ER PT J AU FLOUDAS, G PLACKE, P STEPANEK, P BROWN, W FYTAS, G NGAI, KL AF FLOUDAS, G PLACKE, P STEPANEK, P BROWN, W FYTAS, G NGAI, KL TI DYNAMICS OF THE STRONG POLYMER OF N-LAURYL METHACRYLATE BELOW AND ABOVE THE GLASS-TRANSITION SO MACROMOLECULES LA English DT Article ID POLY(CYCLOHEXYL METHACRYLATE); RELAXATION PROCESSES; NEUTRON-SCATTERING; DIELECTRIC-SPECTROSCOPY; PHOTON-CORRELATION; LIGHT-SCATTERING; POLY(NORMAL-BUTYL METHACRYLATE); INTERMOLECULAR COOPERATIVITY; ALPHA-RELAXATION; LIQUIDS AB Dielectric spectroscopy (DS) and dynamic light scattering (DLS) are employed to study the dynamics of poly(n-lauryl methacrylate) (PnLMA) (M(w) 1.1 x 10(5)) at temperatures below and above the glass transition temperature T-g (T-g approximate to 225 K). The DS and DLS data show no evidence for the splitting between the primary (alpha-) and secondary (beta-) relaxations within the experimental frequency range. The main process affecting DS and DLS is the mixed alpha beta-relaxation which bears similarities to a single alpha-process with regard to the T-dependence of the relaxation times. Excellent agreement between the two sets of experimental relaxation times was found. The distribution of relaxation times exhibits a pronounced temperature dependence: from a Kohlrausch-Williams-Watts (KWW) exponent of beta(KWW) approximate to 0.25 at T approximate to T-g to beta(KWW) approximate to 1 at T approximate to T-g + 100 K and at a frequency of about 1 MHz. PnLMA is therefore, to our knowledge, the only polymer with a Debye (beta = 1) distribution of relaxation times at megahertz frequencies so far. The extremely broad distribution near T-g and the weak normalized temperature dependence of the relaxation time apparently contradict the phenomenologically established correlation between the two in many glass formers. This contradiction might arise from concentration fluctuations of the long alkyl chain which can broaden the relaxation spectrum near T-g. In addition to the main beta-process, a ''fast'' beta-relaxation can be resolved in both experiments and originates from the polyethylene-like alkyl chain. C1 MAX PLANCK INST POLYMER RES, D-55021 MAINZ, GERMANY. ACAD SCI CZECH REPUBL, INST MACROMOLEC CHEM, CR-16206 PRAGUE, CZECH REPUBLIC. UNIV UPPSALA, DEPT PHYS CHEM, S-75121 UPPSALA, SWEDEN. USN, RES LAB, WASHINGTON, DC 20375 USA. RP FLOUDAS, G (reprint author), FDN RES & TECHNOL HELLAS, INST ELECTR STRUCT & LASER, POB 1527, GR-71110 IRAKLION, GREECE. RI Stepanek, Petr/G-2882-2014; Floudas, George/M-7985-2015 OI Stepanek, Petr/0000-0003-1433-678X; NR 65 TC 50 Z9 50 U1 1 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 25 PY 1995 VL 28 IS 20 BP 6799 EP 6807 DI 10.1021/ma00124a015 PG 9 WC Polymer Science SC Polymer Science GA RX357 UT WOS:A1995RX35700015 ER PT J AU KROES, GJ SNIJDERS, JG MOWREY, RC AF KROES, GJ SNIJDERS, JG MOWREY, RC TI PERFORMANCE OF CLOSE-COUPLED WAVE-PACKET METHODS FOR MOLECULE-CORRUGATED SURFACE SCATTERING SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEPENDENT SCHRODINGER-EQUATION; FAST FOURIER-TRANSFORM; REACTIVE SCATTERING; QUANTUM DYNAMICS; DISSOCIATIVE ADSORPTION; ABSORBING POTENTIALS; INTERACTION PICTURE; ATOM SCATTERING; SYSTEMS; H-2 AB The H-2 + LiF(001) system was used to investigate the performance of the hybrid close-coupling wave packet (CCWP) method and of a symmetry adapted, fully close-coupled wave packet (SAWP) method for a molecule-surface problem characterized by fairly high corrugation. In the calculations, a realistic, phi-dependent model potential was used. The calculations were performed for a collision energy of 0.2 eV, with H-2 initially in its j=0 rotational state at normal incidence to the surface, Large increases in the computational efficiencies of both wave packet methods were achieved by taking advantage of the potential coupling matrices associated with both methods becoming sparser with increasing molecule-surface distance. For the present model problem and employing this increased sparseness at longer range, the SAWP method is faster than the CCWP method by a factor of 2. The potential usefulness of the SAWP method for dissociative chemisorption problems is discussed. (C) 1995 American Institute of Physics. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP KROES, GJ (reprint author), VRIJE UNIV AMSTERDAM,DE BOELELAAN 1083,1081 HV AMSTERDAM,NETHERLANDS. NR 96 TC 33 Z9 33 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 22 PY 1995 VL 103 IS 12 BP 5121 EP 5136 DI 10.1063/1.470599 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU876 UT WOS:A1995RU87600034 ER PT J AU OTTERSON, GA KHLEIF, SN CHEN, WD COXON, AB KAYE, FJ AF OTTERSON, GA KHLEIF, SN CHEN, WD COXON, AB KAYE, FJ TI CDKN2 GENE SILENCING IN LUNG-CANCER BY DNA HYPERMETHYLATION AND KINETICS OF P16(INK4) PROTEIN INDUCTION BY 5-AZA 2'DEOXYCYTIDINE SO ONCOGENE LA English DT Article DE P16(INK4); CDKN2; METHYLATION; 5-AZA 2'DEOXYCYTIDINE; LUNG CANCER ID RETINOBLASTOMA GENE; MUTATION AB Absent expression of the cyclin dependent kinase-inhibitor, p16(INK4), is observed in a wide range of primary human cancers. Although homozygous deletions and point mutations have been reported in a subset of these tumors, the molecular basis for absent p16(INK4) in other samples is unknown. We have examined 33 tumor cell lines and have shown that hypermethylation of a G:C-rich region within exon 1 of the CDKN2 gene was present in 100% of samples with wildtype RE expression and no detectable CDKN2 mutations. Treatment for at least 4 hours with the demethylating agent 5-aza 2'deoxycytidine, but not 5-azacytidine or 6-azacytidine, induces the prolonged expression of p16(INK4) protein each of these samples following a discrete 24-48 hour lag period, Consistent with the hypothesis that hypermethylation of the CDKN2 gene is a tumor-specific mechanism for gene inactivation, we observed hypomethylation at the exon 1 site exclusively in tumor lines that expressed p16(INK4) or that had sustained inactivating point mutations within the CDKN2 open reading frame, These findings demonstrate a link between DNA methylation and the p16(INK4):RB tumor suppressor pathway. C1 NCI,USN HOSP,ONCOL BRANCH,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20889. RI kaye, frederic/E-2437-2011; CHEN, WEI-DONG/F-4521-2014 OI CHEN, WEI-DONG/0000-0003-2264-5515 NR 28 TC 207 Z9 215 U1 0 U2 2 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HANTS, ENGLAND RG21 2XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD SEP 21 PY 1995 VL 11 IS 6 BP 1211 EP 1216 PG 6 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA RX180 UT WOS:A1995RX18000026 PM 7566983 ER PT J AU TSAO, CH SILBERBERG, R BARGHOUTY, AF SIHVER, L AF TSAO, CH SILBERBERG, R BARGHOUTY, AF SIHVER, L TI ENERGY DEGRADATION IN COSMIC-RAY NUCLEAR SPALLATION REACTIONS - RELAXING THE STRAIGHT-AHEAD APPROXIMATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC RAYS; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES ID MOMENTUM DISTRIBUTIONS; PROTON-NUCLEUS; TRANSVERSE-MOMENTA; GOLD PROJECTILES; CROSS-SECTIONS; CHARGE YIELDS; HEAVY-IONS; COLLISIONS; FRAGMENTATION; PROPAGATION AB We present the first critical look at the so-called straight-ahead approximation, the assumption that the nuclear spallation products of cosmic rays retain the same energy per nucleon as their progenitors, a value typically used in the calculations of the propagation of cosmic rays. To that end we devise a simple microscopic prescription to take into account such nuclear collisional energy losses; i.e., we relax the straight-ahead approximation. We study the effect in a leaky-box-type calculation using isotopic and elemental abundance ratios of carbon as an example. We find that the effect is, in general, small. It amounts to a slight depression in the calculated ratios (similar to 5%-6%) in some cases around the peak of similar to 1 GeV nucleon(-1), even after we have accounted for solar modulation effects. The effect is strongest for ratios of secondary isotopes (with appreciable Delta A) to primary elements and is practically unobservable for ratios of secondary isotopes to secondary isotopes with similar values of A. The effect may not be negligible, however, since the precision of many measured elemental cosmic-ray abundance ratios has reached the 5% level. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. ROANOKE COLL,DEPT PHYS,SALEM,VA 24153. GSI DARMSTADT,D-64220 DARMSTADT,GERMANY. NR 49 TC 18 Z9 18 U1 2 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1995 VL 451 IS 1 BP 275 EP 283 DI 10.1086/176217 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RU168 UT WOS:A1995RU16800023 ER PT J AU DEPREE, CG GAUME, RA GOSS, WM CLAUSSEN, MJ AF DEPREE, CG GAUME, RA GOSS, WM CLAUSSEN, MJ TI THE SAGITTARIUS-B2 STAR-FORMING REGION .2. HIGH-RESOLUTION H66-ALPHA OBSERVATIONS OF SAGITTARIUS-B2 NORTH SO ASTROPHYSICAL JOURNAL LA English DT Article DE H II REGIONS; ISM, CLOUDS; ISM, INDIVIDUAL (SAGITTARIUS B2); ISM, KINEMATICS AND DYNAMICS; ISM, STRUCTURE; RADIO LINES, ISM ID H-II REGIONS; RECOMBINATION LINE OBSERVATIONS; CONTINUUM AB We have observed the Sagittarius B2 (Sgr B2) North star-forming region with the Very Large Array in the continuum (1.3 cm) and in the radio recombination lines H66 alpha and He66 alpha. Sgr B2 North contains regions of ionized gas ranging in size from unresolved (d < 0.01 pc) to extended (d similar to 0.5 pc) and thus presents an ideal laboratory to study the effects of circumstellar environments on H II region evolution. The H66 alpha data provide high spatial (0''.25) and spectral (10 km s(-1)) resolution kinematics of the ionized gas associated with massive stars. The helium and hydrogen data are used together as a high-resolution probe of Y+ values and variations within Sgr B2. In Sgr B2 North, we measure a helium abundance of [Y+] = 13% +/- 2%. We present the H66 alpha and He66 alpha results from Sgr B2 K, and the nearby sources L, R, and X. Region K consists of six subregions, one of which (K6) has a continuum morphology and a double-peaked spectral line consistent with an expanding shell of ionized gas (v(exp) similar to 22 km s(-1)). We detect no radio recombination line emission (T-l/T-c < 3%) from the ultracompact H II region K2, which is cospatial in projection with the dynamical center of a bipolar molecular outflow imaged in HC3N (Lis et al. 1993). The recombination line velocities of K1 and K3 agree with the north-south rotation in molecular gas observed by Lis ct al. (1993). Source L is an ''arclike'' region with a large velocity gradient of similar to 70 km s(-1) pc(-1) perpendicular to its edge-brightened rim. The large velocity gradient at this orientation observed in Sgr B2 L may be due to rotation of the ionized gas around similar to 150-200 M(.), consisting of low-mass stars. C1 UNIV N CAROLINA,DEPT PHYS & ASTRON,CHAPEL HILL,NC. USN OBSERV,WASHINGTON,DC 20392. RP DEPREE, CG (reprint author), NATL RADIO ASTRON OBSERV,POB O,SOCORRO,NM 87801, USA. NR 29 TC 25 Z9 25 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1995 VL 451 IS 1 BP 284 EP 297 DI 10.1086/176218 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RU168 UT WOS:A1995RU16800024 ER PT J AU MEHL, MJ PAPACONSTANTOPOULOS, DA AF MEHL, MJ PAPACONSTANTOPOULOS, DA TI APPLICATION OF A NEW TIGHT-BINDING METHOD FOR TRANSITION-METALS - MANGANESE SO EUROPHYSICS LETTERS LA English DT Article AB A new tight-binding total-energy method, which has been shown to accurately predict ground-state properties of transition and noble metals, is applied to manganese, the element with the most complex ground-state structure among the d metals. We show that the tight-binding method correctly predicts the ground-state structure of Mn, and offers some insight into the magnetic properties of this state. RP MEHL, MJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Mehl, Michael/H-8814-2016 NR 15 TC 18 Z9 18 U1 0 U2 1 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD SEP 20 PY 1995 VL 31 IS 9 BP 537 EP 541 DI 10.1209/0295-5075/31/9/006 PG 5 WC Physics, Multidisciplinary SC Physics GA RX761 UT WOS:A1995RX76100006 ER PT J AU LEI, PS OGAWA, Y FLIPPENANDERSON, JL KOVAC, P AF LEI, PS OGAWA, Y FLIPPENANDERSON, JL KOVAC, P TI SYNTHESIS AND CRYSTAL-STRUCTURE OF METHYL 4,6-DIDEOXY-4-(3-DEOXY-L-GLYCERO-TETRONAMIDO)-2-O-METHYL-ALPHA-D-MANNOPY RANOSIDE, THE METHYL ALPHA-GLYCOSIDE OF THE TERMINAL UNIT, AND PRESUMED ANTIGENIC DETERMINANT, OF THE O-SPECIFIC POLYSACCHARIDE OF VIBRIO-CHOLERAE O/1, SEROTYPE OGAWA SO CARBOHYDRATE RESEARCH LA English DT Article DE O-POLYSACCHARIDE; VIBRIO CHOLERAE O-1; SEROTYPE OGAWA; ALPHA-D-MANNOPYRANOSIDE; METHYL 4,6-DIDEOXY-4-(3-DEOXY-L-GLYCERO-TETRONAMIDO)-2-O-METHYL; SYNTHESIS; ANTIGENIC DETERMINANT ID LIPOPOLYSACCHARIDE AB Methyl 4-azido-4,6-dideoxy-3-O-benzyl-alpha-D-mannopyranoside and its analogous 3-O-(4-methoxybenzyl) derivative were methylated and the 2-O-methyl derivatives formed were converted into methyl 4-amino-4,6-dideoxy-2-O-methyl-alpha-D-mannopyranoside. Reaction of the latter with 3-deoxy-L-glycero-tetronolactone gave the methyl glycoside of 4,6-dideoxy-4-(3-deoxy-L-glycero-tetronamido)-2-O-methyl-alpha-D-mannopyranose, the monosaccharide that is reported to be the terminal moiety of the O-specific polysaccharide of Vibrio cholerae 0:1, serotype Ogawa. The unit cell packing of the compound, which crystallized as a monohydrate, differs from that of the previously described crystalline compound lacking the 2-O-methyl group. The unmethylated sugar is the terminal moiety of the O-specific polysaccharide of Vibrio cholerae 0:1, serotype Inaba. The crystal structure of methyl 4,6-dideoxy-2-0-methyl-4-trifluoroacetamido-alpha-D-mannopyranoside is also described. C1 NIDDK,BETHESDA,MD 20892. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. NR 18 TC 23 Z9 24 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0008-6215 J9 CARBOHYD RES JI Carbohydr. Res. PD SEP 15 PY 1995 VL 275 IS 1 BP 117 EP 129 DI 10.1016/0008-6215(95)00147-L PG 13 WC Biochemistry & Molecular Biology; Chemistry, Applied; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA RX882 UT WOS:A1995RX88200012 PM 7585718 ER PT J AU ITCHKAWITZ, BS LONG, JP SCHEDELNIEDRIG, T KABLER, MN BRADSHAW, AM SCHLOGL, R HUNTER, WR AF ITCHKAWITZ, BS LONG, JP SCHEDELNIEDRIG, T KABLER, MN BRADSHAW, AM SCHLOGL, R HUNTER, WR TI PHOTOEMISSION AND C-1S NEAR-EDGE ABSORPTION FROM PHOTOPOLYMERIZED C-60 FILMS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SOLID C-60; PHOTOINDUCED POLYMERIZATION; ELECTRONIC-STRUCTURE; VIBRATIONAL RAMAN; C60; SPECTRA; TRANSITION; ORBITALS; OXYGEN; C-70 AB Valence band and C 1s X-ray photoemission and near-edge absorption spectroscopy have been used to characterize C-60 photopolymerization induced by pulsed laser irradiation of 2.43 eV photons. Photoemission spectroscopy at various photon energies detected the reduced amplitude and broadening of the HOMO and HOMO - 1 bands upon polymerization, and the appearance of two additional photoinduced features. In the C Is NEXAFS, the unoccupied bands of C-60 were broadened upon photopolymerization with a small shift (approximate to 0.1 eV) toward higher energy. The dependence of the photopolymerization rate on the incident laser intensity was sublinear for instantaneous laser intensities 70-800 kW/cm(2). C1 MAX PLANCK GESELL,FRITZ HABER INST,D-14195 BERLIN,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD 20785. NR 32 TC 35 Z9 35 U1 2 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD SEP 15 PY 1995 VL 243 IS 3-4 BP 211 EP 216 DI 10.1016/0009-2614(95)00788-6 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RV057 UT WOS:A1995RV05700004 ER PT J AU CHANDRA, S LEAN, JL WHITE, OR PRINZ, DK ROTTMAN, GJ BRUECKNER, GE AF CHANDRA, S LEAN, JL WHITE, OR PRINZ, DK ROTTMAN, GJ BRUECKNER, GE TI SOLAR UV IRRADIANCE VARIABILITY DURING THE DECLINING PHASE OF THE SOLAR-CYCLE-22 SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID LYMAN ALPHA FLUX; ULTRAVIOLET IRRADIANCE; MONITOR AB The SUSIM (Solar Ultraviolet Spectral Irradiance Monitor) and the SOLSTICE (Solar Stellar Irradiance Comparison Experiment) instruments on the UARS (Upper Atmosphere Research Satellite) have been making continuous measurements of the solar UV flux in the spectral range 115-420 nm since October 1991. This period, characterized as the declining phase of solar cycle 22, shows a transition from near maximum to near minimum solar activity levels. During this period, the solar UV flux at Lyman alpha decreased by about 45% from a mean solar maximum value of about 9 mW/m(2), and the integrated solar flux between 200-205 nm decreased by about 5 % from a mean value of about 47 mW/m(2). Using the MgII index as a proxy of solar UV irradiance variability, it is shown that the temporal relationship of the UARS solar Lyman alpha irradiance and the MgII index during solar cycle 22 is significantly different than during solar cycle 21, inferred from the SME (Solar Mesosphere Explorer) Lyman alpha measurements. Moreover, during solar cycle 22, the scale factor for solar Lyman alpha irradiance (% change for 1% change in MgII index) is about 1.5 times larger for long term changes than for changes over the time scale of a solar rotation. Unlike Lyman alpha, the scale factor for the UV flux in the 200-205 nm wavelength range, is close to unity both for the rotational and longer time scales. The spectral dependence of the two scale factors in the 120-200 nm range is derived from the SOLSTICE data which may be used with the MgII index to estimate the UV irradiance variability in this spectral range for both short and long time scales. C1 USN,RES LAB,WASHINGTON,DC 20375. NATL CTR ATMOSPHER RES,HIGH ALTITUDE OBSERV,BOULDER,CO 80307. RP CHANDRA, S (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 916,GREENBELT,MD 20771, USA. OI Lean, Judith/0000-0002-0087-9639 NR 13 TC 30 Z9 30 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 15 PY 1995 VL 22 IS 18 BP 2481 EP 2484 DI 10.1029/95GL02476 PG 4 WC Geosciences, Multidisciplinary SC Geology GA RW251 UT WOS:A1995RW25100011 ER PT J AU MYERS, MC ANTONIADES, JA MEGER, RA MURPHY, DP FERNSLER, RF HUBBARD, RF AF MYERS, MC ANTONIADES, JA MEGER, RA MURPHY, DP FERNSLER, RF HUBBARD, RF TI TRANSPORT AND CENTERING OF HIGH-CURRENT ELECTRON-BEAMS IN NEUTRAL GAS-FILLED CELLS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ION-FOCUSED REGIME; HOSE INSTABILITY; CHANNEL; SIMULATION AB Conducting tubes filled with neutral gas at pressures between 0.001 and 0.1 Torr can be used to transport, to center, and to reduce the transverse oscillations of high current (>10 kA) electron beams. Electron impact ionization of the gas leads to partial neutralization of the beam space charge allowing self-focused beam transport and phase-mix damping of injected beam oscillations. In addition, the presence of conducting walls helps center the beam in the transport tube. High current beams, transported through a 1.3 m long tube, were centered to within one-tenth of the beam radius and input transverse oscillations were damped to submillimeter values without significant current loss or emittance growth. Beam transport properties are examined as a function of injected current, gas pressure, and cell geometry. Experimental results are compared with a theoretical model. RP MYERS, MC (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 41 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1995 VL 78 IS 6 BP 3580 EP 3591 DI 10.1063/1.359933 PG 12 WC Physics, Applied SC Physics GA RU953 UT WOS:A1995RU95300004 ER PT J AU CONNELL, LL FLEMING, JW CHU, HN VESTYCK, DJ JENSEN, E BUTLER, JE AF CONNELL, LL FLEMING, JW CHU, HN VESTYCK, DJ JENSEN, E BUTLER, JE TI SPATIALLY-RESOLVED ATOMIC-HYDROGEN CONCENTRATIONS AND MOLECULAR-HYDROGEN TEMPERATURE PROFILES IN THE CHEMICAL-VAPOR-DEPOSITION OF DIAMOND SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID 4-PHOTON IONIZATION; REACTION-KINETICS; LOW-PRESSURE; H-ATOMS; GROWTH; FILAMENT; ENVIRONMENT; SURFACE; CARS; GENERATION AB We report here a direct measurement of the spatially resolved atomic hydrogen concentration profiles during hot-filament-assisted chemical-vapor deposition (HFCVD) of diamond films, The ground-state hydrogen (1s(2)S(1/2) atoms generated in this process are monitored by an optical four-wave-mixing technique, third-harmonic generation (THG). For THG, a 364.6 nm dye laser beam is focused into the HFCVD reactor and the third-harmonic radiation near resonant with the Lyman-alpha(2p(2)P(j)(0)<->1s(2)S(1/2)) transition in atomic hydrogen at 121.6 nm is observed, The resultant THG intensity and THG peak shift with respect to the Lyman-alpha transition are both dependent on hydrogen atom concentration. Titration experiments based on the reaction NOCl+H-->HCl+NO were conducted to obtain absolute hydrogen atom concentrations from the relative concentrations determined in the THG experiment. Spatially resolved molecular hydrogen temperature and concentration profiles obtained by coherent anti-Stokes Raman scattering in a similar HFCVD reactor are reported. The observed H atom concentrations exceed computed equilibrium concentrations based on the measured gas temperatures. Transport of the atomic hydrogen from the hot filament surfaces is discussed and diffusion is shown to be the principal mechanism controlling the H atom distribution. C1 USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 67 TC 77 Z9 79 U1 2 U2 14 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 SEP 15 PY 1995 VL 78 IS 6 BP 3622 EP 3634 DI 10.1063/1.359939 PG 13 WC Physics, Applied SC Physics GA RU953 UT WOS:A1995RU95300010 ER PT J AU ROLAND, CM NGAI, KL LEWIS, LJ AF ROLAND, CM NGAI, KL LEWIS, LJ TI HIGH-FREQUENCY RELAXATION OF O-TERPHENYL SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID LIQUID-GLASS TRANSITION; INCOHERENT NEUTRON-SCATTERING; TEMPERATURE-DEPENDENCE; SEGMENTAL RELAXATION; ALPHA-RELAXATION; LIGHT-SCATTERING; CONFORMATIONAL TRANSITIONS; SECONDARY RELAXATION; SUPERCOOLED LIQUIDS; MOLECULAR GLASS AB Results of molecular dynamics simulations (MDS) of o-terphenyl, a glass-forming liquid, are analyzed in terms of the coupling model of relaxation. At low temperatures thermally activated relaxation processes are suppressed, whereby the density-density correlation function, C(t), obtained by MDS is determined entirely by vibrational modes. This enables the low temperature data to be used to deduce the vibrational density of states, g(omega). With g(omega) determined, the vibrational contribution, C-pho(t), is calculated at higher temperatures assuming that g(omega) is independent of temperature. At higher temperatures, relaxation makes its appearance and is modeled here by the fast dynamics of the coupling model. Assuming that vibration and relaxation contribute independently, the density-density self-correlation function is given by the product C-pho(t)C-rel(t), with the relaxation part obtained from the coupling model. There is good overall agreement between the calculated C(t) and the MDS data. Microscopic parameters, including the energy barrier for reorientation of the o-terphenyl molecule, are extracted from the MDS results. (C) 1995 American Institute od Physics. C1 UNIV MONTREAL, DEPT PHYS, MONTREAL, PQ H3C 3J7, CANADA. RP ROLAND, CM (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. RI Lewis, Laurent/E-5546-2013 NR 50 TC 60 Z9 60 U1 0 U2 4 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 SEP 15 PY 1995 VL 103 IS 11 BP 4632 EP 4636 DI 10.1063/1.470651 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU110 UT WOS:A1995RU11000026 ER PT J AU VERSCHELL, MA KINDLE, JC OBRIEN, JJ AF VERSCHELL, MA KINDLE, JC OBRIEN, JJ TI EFFECTS OF INDO-PACIFIC THROUGHFLOW ON THE UPPER TROPICAL PACIFIC AND INDIAN OCEANS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID LAYER SALINITY BUDGET; THERMOCLINE WATER; BOUNDARY; MODEL; OSCILLATION; CIRCULATION; REFLECTION; SEA; VARIABILITY; DYNAMICS AB The dynamics and influence of the connection between the Pacific and Indian Oceans in the Indonesian Archipelago (PACIO) on the upper tropical Pacific and Indian Oceans are investigated using a reduced gravity global model. Two different model geometries are used; the first has an open PACIO region (open case) that permits normal transport, the second has a closed PACIO region (closed case) that allows no transport. The model is forced by either monthly 1980-1989 European Centre for Medium-Range Weather Forecasting wind stresses or by an imposed Rossby wave pulse. The average upper layer thickness of the Indian Ocean is significantly greater and more variable because of the influence of PACIO transport. The effect in the Pacific Ocean is much smaller, and there appears to be no appreciable effect of PACIO transport on interannual variability in the eastern tropical Pacific Ocean. RMS differences between the open and closed cases show area of low-frequency (> 1/2 year) variability over most of the southern Indian Ocean, the western boundary of the Indian Ocean, the region of the Mindanao Eddy, and the eastern equatorial Pacific waveguide. Areas of significant high-frequency variability are the East African Coastal Current, the Mindanao Eddy region, the Coral Sea Basin, and in the eastern equatorial Pacific waveguide. The large effect on the southern Indian Ocean is linked to off-equatorial Rossby waves generated by transport through the PACIO region. C1 USN, RES LAB, BAY ST LOUIS, MS 39529 USA. RP VERSCHELL, MA (reprint author), FLORIDA STATE UNIV, CTR OCEAN ATMOSPHER PREDICT STUDIES, 020 LOVE BLDG, TALLAHASSEE, FL 32306 USA. NR 46 TC 33 Z9 33 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-OCEANS JI J. Geophys. Res.-Oceans PD SEP 15 PY 1995 VL 100 IS C9 BP 18409 EP 18420 DI 10.1029/95JC02075 PG 12 WC Oceanography SC Oceanography GA RV579 UT WOS:A1995RV57900011 ER PT J AU JIANG, L GARWOOD, RW AF JIANG, L GARWOOD, RW TI A NUMERICAL STUDY OF 3-DIMENSIONAL DENSE BOTTOM PLUMES ON A SOUTHERN-OCEAN CONTINENTAL-SLOPE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID DEEP CONVECTION; WEDDELL SEA; BOUNDARY-LAYER; MODEL; CIRCULATION; WATER; SHELVES; EDDIES AB Three-dimensional features of dense bottom plumes flowing over continental slopes, with or without along-slope topographic variations, are investigated by simulating the evolution of a density front at a Southern Ocean continental shelf break, using a three-dimensional, primitive equation numerical model with a second-order turbulence closure scheme embedded. The focus of our investigation is the role of topography in determining mixing and the offshore transport of dense shelf water during the transient adjustment process of a density front over a continental slope. We compare and discuss the numerical simulations for two cases: a uniform shelf and slope case and a case with a canyon that leads from the coast to the deep ocean crossing the shelf and the slope. The numerical simulations indicate that baroclinic instability, planetary rotation, bottom friction, and topography play major roles in determining the surface and bottom plume formation, the growth and penetration depth of the bottom plumes, and the characteristics of water mass on the slope. Mesoscale eddies play a fundamental role in transporting mass, heat, and salt from shelf to deep ocean. The effects of the depth and width of the canyon are examined with two more experiments. The presence of a wide and deep canyon in the continental shelf and slope enhances considerably the drainage of coastal shelf water into the deep ocean. RP JIANG, L (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 33 TC 39 Z9 40 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD SEP 15 PY 1995 VL 100 IS C9 BP 18471 EP 18488 DI 10.1029/95JC01512 PG 18 WC Oceanography SC Oceanography GA RV579 UT WOS:A1995RV57900016 ER PT J AU GALLACHER, PC ROCHFORD, PA AF GALLACHER, PC ROCHFORD, PA TI NUMERICAL SIMULATIONS OF THE ARABIAN SEA USING TRACERS AS PROXIES FOR PHYTOPLANKTON BIOMASS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID EL-CHICHON ERUPTION; POSSIBLE CONNECTION; OCEAN PRODUCTION; MONSOON; SOMALI AB A set of numerical simulations were conducted to determine the potential interannual variation of phytoplankton biomass in the Arabian Sea. A four-layer, reduced gravity model was forced with interannually varying, monthly mean winds for the years 1981 to 1990 and a seasonally varying, monthly mean climatological heat flux. Passive tracers, with fixed source and decay rates, were used as proxies for phytoplankton. The tracers were released in the second layer, and upwelling combined with interlayer mixing transported the tracers into the first (the top) layer of the model. In the top layer advection, diffusion and specified decay rate produced distributions of tracer concentration that we compare with coastal zone color scanner (CZCS) images. In addition to maps of tracer distribution, we constructed time series from areal averages of tracer concentration. The time series are particularly useful for analyzing the temporal variability of the tracer concentrations. There was substantial interannual variability in the results and a strong seasonal signal associated with the southwest monsoon. The years of maximal tracer concentration were 1990 and 1985. The first was associated with a decadal maximum in wind speed and the second with a large wind stress curl over the western Arabian Sea. The years with minimal tracer concentration were 1981 through 1983. We compare our results with published analyses of composited CZCS images during the southwest monsoon in 1981 and 1982. We find general agreement between our results and the CZCS images during the peak of the southwest monsoon; however, we find that during the early phase of the monsoon, when the winds are strengthening rapidly with time, the CZCS images are badly aliased by year to year changes in the time periods used to composite available satellite data. C1 SVERDRUP TECHNOL INC,MSAAP,BAY ST LOUIS,MS 39529. RP GALLACHER, PC (reprint author), USN,RES LAB,DIV OCEANOG,CODE 7331,BLDG 1103,BAY ST LOUIS,MS 39529, USA. NR 21 TC 7 Z9 7 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD SEP 15 PY 1995 VL 100 IS C9 BP 18565 EP 18579 DI 10.1029/95JC01297 PG 15 WC Oceanography SC Oceanography GA RV579 UT WOS:A1995RV57900022 ER PT J AU AYERS, JD KONNERT, JH DANTONIO, P PATTNAIK, A VOLD, CL JONES, HN AF AYERS, JD KONNERT, JH DANTONIO, P PATTNAIK, A VOLD, CL JONES, HN TI MORPHOLOGY OF SURFACE CRYSTALLITES ON AMORPHOUS FE87ZR7B5CU1 SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID SOFT MAGNETIC-PROPERTIES; METALLIC GLASSES; ALLOYS AB Surface crystallites a few tens of nanometres in breadth have been observed on the as-melt-spun surface of an alloy of composition Fe87Zr7B6Cu1. These crystallites are preferentially oriented, and exhibit a (200) texture. Heat treatments at temperatures in the interval 623-773 degrees C caused the surface grains to coarsen and new, randomly oriented crystals to form. Compositional inhomogeneities were found to contribute to the formation of the surface crystallites. Results suggest that surface energy effects are more important during the nucleation of crystallites in the liquid than they are below the glass transition temperature. RP AYERS, JD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 9 Z9 9 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD SEP 15 PY 1995 VL 30 IS 18 BP 4492 EP 4506 DI 10.1007/BF01153054 PG 15 WC Materials Science, Multidisciplinary SC Materials Science GA RW349 UT WOS:A1995RW34900002 ER PT J AU PEEBLES, LH SNOW, AW PETERS, WC AF PEEBLES, LH SNOW, AW PETERS, WC TI ON THE EXOTHERM OF POLYACRYLONITRILE .2. EXAMINATION OF DEUTERATED POLYMERS SO JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY LA English DT Article DE ALPHA-, BETA,BETA-, AND ALPHA,BETA,BETA-DEUTERATED POLYACRYLONITRILE; POLYACRYLONITRILE STABILIZATION; DEUTERIUM ISOTOPE EFFECTS ID CARBON-FIBERS; ACRYLIC FIBERS; STABILIZATION AB A series of alpha-, beta,beta-, and alpha,beta,beta-deuterium-labeIled acrylonitrile monomers were prepared and polymerized. Secondary deuterium isotope effects on the polymerization and on the pyrolysis reactions that precede carbon fiber formation were observed. When deuterium is in the alpha-position, the polymerization rate is greater and the molecular weight is higher. It is proposed that either the propagation rate constant or both that constant and the termination rate constant are increased on deuterium substitution. In differential scanning calorimetry, the polyacrylonitrile exotherm occurs at higher temperatures and is narrower when deuterium is substituted at the alpha-position. On the other hand, the thermal gravimetric analysis activation energy for weight loss of polymer at temperatures below the acrylic exotherm is lower when deuterium is in the a-position, relative to the alpha-hydrogen polymers. As there is no correlation between the weight loss energy of activation and the various exotherm parameters, the weight loss and the exotherm are considered to be independent events. Examination of the distribution of deuterium substituted ammonia species evolved during 100-240 degrees C thermal treatment of the alpha- and beta,beta-deuterated polyacrylonitriles provides a clear indication that both the alpha- and beta-positions are directly involved in hydrogen migration to nitrogen, but the mechanism of ammonia generation remains unclear. (C) 1995 John Wiley and Sons, Inc. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 27 TC 7 Z9 7 U1 2 U2 4 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-624X J9 J POLYM SCI POL CHEM JI J. Polym. Sci. Pol. Chem. PD SEP 15 PY 1995 VL 33 IS 12 BP 2069 EP 2077 DI 10.1002/pola.1995.080331214 PG 9 WC Polymer Science SC Polymer Science GA RP024 UT WOS:A1995RP02400014 ER PT J AU MERMELSTEIN, MD AF MERMELSTEIN, MD TI INFRARED SOLAR GLINT CLUTTER ON THE OCEAN SURFACE SO OPTICS LETTERS LA English DT Article AB A closed-form expression is developed for the infrared solar glint clutter radiance generated by the near-horizon ocean surface. The clutter radiance is calculated as a function of water temperature, wind speed, wind direction, and solar position and agrees well with midwave infrared imagery measurements. RP MERMELSTEIN, MD (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5622,WASHINGTON,DC 20375, USA. NR 6 TC 0 Z9 0 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1995 VL 20 IS 18 BP 1844 EP 1846 DI 10.1364/OL.20.001844 PG 3 WC Optics SC Optics GA RU367 UT WOS:A1995RU36700004 PM 19862177 ER PT J AU MERMELSTEIN, MD AF MERMELSTEIN, MD TI FIBEROPTIC ATMOSPHERIC-TURBULENCE SENSOR SO OPTICS LETTERS LA English DT Article AB A novel dual-air-gap fiber-optic Mach-Zehnder interferometer is proposed for the direct measurement of the atmospheric optical turbulence structure constant C-n(2). The shot-noise-limited minimum detectable structure constant is estimated to be 4.5 x 10(-20) m(-2/3), which is more than 2 orders of magnitude below a typical value of 10(-17) m(-2/3) for weak turbulence. This sensor is suitable for the measurement of atmospheric turbulence over land and ocean surfaces. (C) 1995 Optical Society of America RP MERMELSTEIN, MD (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5622,WASHINGTON,DC 20375, USA. NR 5 TC 5 Z9 5 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1995 VL 20 IS 18 BP 1922 EP 1923 DI 10.1364/OL.20.001922 PG 2 WC Optics SC Optics GA RU367 UT WOS:A1995RU36700030 PM 19862203 ER PT J AU PANDEY, RB BECKLEHIMER, JL AF PANDEY, RB BECKLEHIMER, JL TI A HYBRID COMPUTER-SIMULATION APPROACH TO SHOCK PROPAGATION IN FLUID THROUGH POROUS-MEDIA SO PHYSICA A LA English DT Article ID LATTICE-GAS AUTOMATA; DYNAMICS; HYDRODYNAMICS; WAVES AB An interacting lattice gas method is introduced to study the shock propagation through fluid in a porous medium. This approach incorporates the collision between the fluid particles as in direct simulation methods and interactions among the particles by the Metropolis algorithms to hop the fluid particles. We consider a two dimensional discrete lattice with a line of shock in a porous medium generated by a random distribution of fixed barriers at the pore boundaries. The velocity gradient caused by the shock drives the fluid. We find that the shock fronts drift in high porosity and propagate nondiffusively as the shock-driven flow field competes with the pore barriers, especially at low porosity (i.e. high ramification). The magnitude of the fluid velocity at the shock front decays with lime nonlinearly, The shock depletes the fluid density as it propagates into the lattice, Damping of the shock profile is enhanced on reducing the porosity. C1 UNIV SO MISSISSIPPI,DEPT PHYS & ASTRON,HATTIESBURG,MS 39406. USN,RES LAB,BAY ST LOUIS,MS 39529. RP PANDEY, RB (reprint author), UNIV SO MISSISSIPPI,COMP SCI PROGRAM,HATTIESBURG,MS 39406, USA. NR 23 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD SEP 15 PY 1995 VL 219 IS 1-2 BP 121 EP 134 DI 10.1016/0378-4371(95)00188-D PG 14 WC Physics, Multidisciplinary SC Physics GA RU510 UT WOS:A1995RU51000009 ER PT J AU SAENZ, AW KUMMER, M AF SAENZ, AW KUMMER, M TI NONINTEGRABILITY OF THE STORMER PROBLEM SO PHYSICA D-NONLINEAR PHENOMENA LA English DT Article ID HAMILTONIAN-MECHANICS; 1ST INTEGRALS; NONEXISTENCE AB Let K-M be the Hamiltonian obtained by reducing the nonrelativistic Hamiltonian H of the Stormer problem w.r. to the rotational symmetry about the magnetic dipole direction and fixing M = epsilon M(3) at a nonzero value, epsilon denoting the sign of the particle charge and M(3) the angular momentum component along this direction. Our main result is that K-M does not possess for any M not equal 0 a global real analytic integral of K-M, functionally independent of K-M, and having a (single valued) meromorphic extension to a connected neighborhood of a suitable complexified nonequilibrium phase curve of K-M. This implies that H has no global real analytic integral in involution with M(3), functionally independent of H and M(3), and extendable meromorphically to the complexified phase space of H. These properties of K-M and H immediately entail similar nonintegrability properties for their relativistic analogues. The nonintegrability of K-M for M not equal 0 was proved by using Churchill and Rod's version of Kovacic's algorithm. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV TOLEDO, DEPT MATH, TOLEDO, OH 43606 USA. RP CATHOLIC UNIV AMER, DEPT PHYS, WASHINGTON, DC 20064 USA. NR 18 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 EI 1872-8022 J9 PHYSICA D JI Physica D PD SEP 15 PY 1995 VL 86 IS 3 BP 363 EP 372 DI 10.1016/0167-2789(95)00117-M PG 10 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA RV624 UT WOS:A1995RV62400002 ER PT J AU GEARHART, CC HICKS, JC AF GEARHART, CC HICKS, JC TI SELF-CONSISTENT SPIN-SPIN AND DENSITY-DENSITY CORRELATIONS IN THE HUBBARD-MODEL SO PHYSICAL REVIEW B LA English DT Note ID SYSTEMS AB A linear combination of Hubbard projection operators is used to linearize the equations of motion for the Hubbard model. The Green's functions in this linearization scheme depend explicitly on the value of the nearest-neighbor density-density correlation function. For the half-filled case we calculate this correlation function by taking variations of the equations of motion with respect to a density field. Three-body vertex corrections are ignored. The expressions we get for the correlation functions along with the equations of motion for the Green's functions form a system of equations that can be solved self-consistently. We solve these equations, both with and without effective vertex corrections, for a half-filled 12-site chain. These results are compared to numerically exact Lanczos solutions and to standard mean-held calculations. Calculations of on-site charge correlation, groundstate energy, and long-range spin-spin correlations for intermediate values of U show a significant improvement over standard mean-field techniques. RP GEARHART, CC (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TESTING & EVALUAT,MAT RES BRANCH,SAN DIEGO,CA 92152, USA. NR 15 TC 1 Z9 1 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 11 BP 7787 EP 7790 DI 10.1103/PhysRevB.52.7787 PG 4 WC Physics, Condensed Matter SC Physics GA RV818 UT WOS:A1995RV81800006 ER PT J AU SWINEFORD, RS PAPPAS, DP HARRIS, VG AF SWINEFORD, RS PAPPAS, DP HARRIS, VG TI STRUCTURE OF C-STABILIZED FCC FE ON DIAMOND - EPITAXIAL-GROWTH OF AUSTENITE SO PHYSICAL REVIEW B LA English DT Note ID FILMS; CU(100); MAGNETIZATION; FE/CU(100); TRANSITION; DEPENDENCE AB Fe films were grown on single-crystal diamond substrates and the structure and chemistry of the Fe near neighbor environment was studied. It was observed that the Fe is in a metastable fee structure after a 350 degrees anneal, and a compression of the lattice in the plane of the surface of 1 +/- 0.6% was obtained by comparing low-energy electron diffraction and extended x-ray absorption fine-structure results. Auger-electron spectroscopy shows that C begins diffusing into the fee Fe lattice at approximately 200 degrees C. It was observed that the C signal saturates at the equivalent of 1 atom/unit cell in the Fe film, and that the C atoms reside in the octahedral site, as expected for an austenite structure. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP SWINEFORD, RS (reprint author), VIRGINIA COMMONWEALTH UNIV, DEPT PHYS, RICHMOND, VA 23284 USA. RI Harris, Vincent/A-8337-2009 NR 22 TC 7 Z9 7 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 11 BP 7890 EP 7893 DI 10.1103/PhysRevB.52.7890 PG 4 WC Physics, Condensed Matter SC Physics GA RV818 UT WOS:A1995RV81800033 ER PT J AU ETHRIDGE, EC ERWIN, SC PICKETT, WE AF ETHRIDGE, EC ERWIN, SC PICKETT, WE TI METASTABILITY OF NBN IN THE ORDERED VACANCY NBO PHASE SO PHYSICAL REVIEW B LA English DT Note ID DENSITY AB A metastable phase of NbN with superconducting T-c = 16.4 K was reported recently by Treece and collaborators. The reported structure of the thin-film sample deviates from the rocksalt (B1) NbN structure with 25% ordered vacancies on each sublattice (space group Pm3m) and a lattice constant of 4.442 Angstrom. Using full-potential electronic-structure methods, we contrast the electronic structure with that of B1 NbN. The calculated energy, 1.00 eV/molecule higher than B1 NbN, and calculated lattice constant of 4.214 Angstrom indicate that the new phase must be something other than the ordered stoichiometric Pm3m phase. RP ETHRIDGE, EC (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Erwin, Steven/B-1850-2009 NR 18 TC 6 Z9 6 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1995 VL 52 IS 12 BP R8589 EP R8592 PG 4 WC Physics, Condensed Matter SC Physics GA RZ008 UT WOS:A1995RZ00800002 ER PT J AU BASKI, AA ERWIN, SC WHITMAN, LJ AF BASKI, AA ERWIN, SC WHITMAN, LJ TI A STABLE HIGH-INDEX SURFACE OF SILICON - SI(5 5 12) SO SCIENCE LA English DT Article ID RECONSTRUCTION; SI(111)2X1; STEPS AB A stable high-index surface of silicon, Si(5 5 12), is described. This surface forms a 2 x 1 reconstruction with one of the largest unit cells ever observed, 7.7 angstroms by 53.5 angstroms. Scanning tunneling microscopy (STM) reveals that the 68 surface atoms per 2 x 1 unit cell are reconstructed only on a local scale. A complete structural model for the surface is proposed, incorporating a variety of features known to exist on other stable silicon surfaces. Simulated STM images based on this model have been computed by first-principles electronic-structure methods and show excellent agreement with experiment. C1 USN,RES LAB,WASHINGTON,DC 20375. RI Erwin, Steven/B-1850-2009; Whitman, Lloyd/G-9320-2011; OI Whitman, Lloyd/0000-0002-3117-1174; Baski, Alison/0000-0002-8985-8067 NR 24 TC 107 Z9 108 U1 0 U2 5 PU AMER ASSOC ADVAN SCIENCE PI WASHINGTON PA 1333 H ST NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 15 PY 1995 VL 269 IS 5230 BP 1556 EP 1560 DI 10.1126/science.269.5230.1556 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RU813 UT WOS:A1995RU81300034 PM 17789447 ER PT J AU KLIMCHUK, JA PORTER, LJ AF KLIMCHUK, JA PORTER, LJ TI SCALING OF HEATING RATES IN SOLAR CORONAL LOOPS SO NATURE LA English DT Article ID X-RAY TELESCOPE; FLUX TUBES; EQUILIBRIUM; DISSIPATION; NANOFLARES; ABSORPTION; FIELDS; WAVES AB THE gas of the solar corona is at a temperature of several million degrees, orders of magnitude hotter than the underlying photosphere, The nature of the physical process that heats the solar corona (and the coronae of solar-type stars more generally) has been a long-standing puzzle, A number of plausible heating mechanisms have been proposed, but observations have so far been unable to discriminate between them(1). Here we show that coronal heating exhibits scaling properties that should provide a powerful diagnostic of the underlying mechanism. The coronal magnetic field organizes the coronal plasma into loop-like features, which form the basic structural elements of the corona(2). We demonstrate that the pressures and lengths of the coronal loops are statistically related, suggesting that the heating rate scales inversely with approximately the square of the loop length. Existing coronal heating theories make different predictions about what this scaling should he, and a model(3,4) of energy dissipation bg stressed coronal magnetic fields appears at present to be the most consistent with our observational result. C1 MIT, CAMBRIDGE, MA 02139 USA. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7675JAK, WASHINGTON, DC 20375 USA. RI Klimchuk, James/D-1041-2012 OI Klimchuk, James/0000-0003-2255-0305 NR 31 TC 54 Z9 54 U1 0 U2 1 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD SEP 14 PY 1995 VL 377 IS 6545 BP 131 EP 133 DI 10.1038/377131a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RU754 UT WOS:A1995RU75400041 ER PT J AU WU, CG DEGROOT, DC MARCY, HO SCHINDLER, JL KANNEWURF, CR BAKAS, T PAPAEFTHYMIOU, V HIRPO, W YESINOWSKI, JP LIU, YJ KANATZIDIS, MG AF WU, CG DEGROOT, DC MARCY, HO SCHINDLER, JL KANNEWURF, CR BAKAS, T PAPAEFTHYMIOU, V HIRPO, W YESINOWSKI, JP LIU, YJ KANATZIDIS, MG TI REACTION OF ANILINE WITH FEOCL - FORMATION AND ORDERING OF CONDUCTING POLYANILINE IN A CRYSTALLINE LAYERED HOST SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Review ID X-RAY-DIFFRACTION; INTRAMOLECULAR ELECTRON-TRANSFER; STATE C-13 NMR; INTERCALATION COMPOUNDS; PHASE-TRANSITIONS; ANODIC SYNTHESIS; POLYMERIC METAL; RELAXATION DATA; FE SHEETS; H-2 NMR AB A detailed study of the intercalative polymerization reaction of aniline with FeOCl, an extensive physicochemical and spectroscopic characterization of the products, and their oxidative behavior in air is presented. FeOCl reacts with excess aniline in CH3CN at 25 degrees C, in air, to form black microcrystalline products containing polyaniline (PANI) of the general formula (PANI)(x)FeOCl (I). X-ray diffraction from a single crystal of (PANI)(x)FeOCl shows that the polymer is intercalated in an ordered fashion that is commensurate with the FeOCl lattice. This ordering causes a doubling of the unit cell in the two in-plane directions (a- and c-) forming a 2a x 2c superlattice. The PANI can be extracted from (I) by FeOCl framework dissolution in acid. Molecular weight studies of extracted PANI via gel permeation chromatography (GPC) analysis suggest (M) over bar(w) similar to 6100 and (M) over bar(n) similar to 3500 versus (M) over bar(w) similar to 69 000 and (M) over bar(n) similar to 7700 observed for bulk PANI. Chain lengths of PANI in the intralamellar space are shorter than those of bulk PANI but show narrower length distribution. Variable temperature H-2-wide-line NMR of (PANI)(x)FeOCl shows that the polymer chains are significantly confined with respect to phenyl ring rotation, but the spectra are influenced by the electron paramagnetism of the host. The (PANI)(x)FeOCl was also characterized by infrared spectroscopy, Mossbauer spectroscopy, electron paramagnetic resonance spectroscopy, thermal gravimetric analysis, magnetic susceptibility measurements, and charge-transport measurements. Mossbauer spectroscopy suggests a mixed-valent FeOCl with a Fe2+/Fe3+ ratio in the material similar to 1:9. Aerial oxidation of (PANI)(x)FeOCl yields an intimate mixture of PANI and beta-FeOOH. The PANI after oxidation shows a molecular weight intermediate between that extracted from fresh (PANI)(x)FeOCl and bulk PANI. The electrical conductivity of single crystals is 1.5 x 10(-2) S/cm and features a thermally activated temperature dependence consistent with a semiconductor. Thermoelectric power measurements show a positive Seebeck coefficient (similar to 10 mu V/K) at room temperature which increases steadily with decreasing temperature, reaching the value of 100-400 mu V/K at 150 K, consistent with a p-type semiconductor. The charge transport data suggest that in (PANI)(x)FeOCl the reduced FeOCl framework dominates the electronic conduction. C1 MICHIGAN STATE UNIV, DEPT CHEM, E LANSING, MI 48824 USA. MICHIGAN STATE UNIV, CTR FUNDAMENTAL MAT RES, E LANSING, MI 48824 USA. NORTHWESTERN UNIV, DEPT ELECT ENGN & COMP SCI, EVANSTON, IL 60208 USA. UNIV IOANNINA, DEPT PHYS, GR-45110 IOANNINA, GREECE. USN, RES LAB, WASHINGTON, DC 20375 USA. NR 130 TC 114 Z9 118 U1 6 U2 53 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 SEP 13 PY 1995 VL 117 IS 36 BP 9229 EP 9242 DI 10.1021/ja00141a015 PG 14 WC Chemistry, Multidisciplinary SC Chemistry GA RU818 UT WOS:A1995RU81800015 ER PT J AU KOVALEV, D BENCHORIN, M DIENER, J KOCH, F EFROS, AL ROSEN, M GIPPIUS, NA TIKHODEEV, SG AF KOVALEV, D BENCHORIN, M DIENER, J KOCH, F EFROS, AL ROSEN, M GIPPIUS, NA TIKHODEEV, SG TI POROUS SI ANISOTROPY FROM PHOTOLUMINESCENCE POLARIZATION SO APPLIED PHYSICS LETTERS LA English DT Article ID SILICON; LUMINESCENCE AB We report the observation of the anisotropic linear polarization of porous Si photoluminescence measured in two excitation geometries. In the normal excitation geometry (exciting beam normal to the sample (100) surface) linear luminescence polarization of as much as 20% is seen parallel to the excitation polarization. In the edge excitation geometry (exciting light incident on a cleaved edge of the sample) the luminescence polarization is aligned mainly in the [100] direction (normal to the surface). The effect is described within the framework of a dielectric model in which porous Si is considered as an aggregate of slightly deformed, elongated and flattened, dielectric elliptical Si nanocrystals with preferred orientation in the [100] direction. (C) 1995 American Institute of Physics. C1 USN,RES LAB,BEAM THEORY SECT,WASHINGTON,DC 20375. RUSSIAN ACAD SCI,INST GEN PHYS,MOSCOW 117333,RUSSIA. RP KOVALEV, D (reprint author), TECH UNIV MUNICH,DEPT PHYS,E16,D-85747 GARCHING,GERMANY. RI Tikhodeev, Sergei/A-5452-2016 OI Tikhodeev, Sergei/0000-0001-5940-055X NR 19 TC 97 Z9 98 U1 2 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 11 PY 1995 VL 67 IS 11 BP 1585 EP 1587 DI 10.1063/1.114947 PG 3 WC Physics, Applied SC Physics GA RT787 UT WOS:A1995RT78700030 ER PT J AU TWIGG, ME BENNETT, BR SHANABROOK, BV AF TWIGG, ME BENNETT, BR SHANABROOK, BV TI INFLUENCE OF INTERFACE AND BUFFER LAYER ON THE STRUCTURE OF INAS/GASB SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID GROWTH AB Using image processing algorithms based on nonlinear imaging theory, we have analyzed high-resolution transmission electron microscopy image of InAs/GaSb superlattices (SLs) grown by molecular beam epitaxy. Our analysis indicates that InSb-like interfaces have a roughness of 1 monolayer (ML), for a SL grown on a GaSb buffer layer. For GaAs-like interfaces, however, the interface roughness is found to be 2 MLs when the SL is grown on a GaSb buffer. For SLs grown on an InAs buffer, the roughness of GaAs-Like interfaces (3 MLs) is also greater than that of InSb-like interfaces (2MLs). These results suggest two general observations. The first is that GaAs-like interfaces are rougher than InSb-like interfaces. This difference may be due to the high surface energy of GaAs as compared to InSb. The second observation is that interface roughness is greater for an InAs/GaSb SL grown on an InAs buffer layer than for the same SL grown on a GaSb buffer layer. This difference in interface roughness may be due to InAs SL layers being in tension when grown on a GaSb buffer layer, whereas GaSb SL layers are under compression when grown on an InAs buffer layer. (C) 1995 American Institute of Physics. RP TWIGG, ME (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 12 TC 11 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 11 PY 1995 VL 67 IS 11 BP 1609 EP 1611 DI 10.1063/1.114955 PG 3 WC Physics, Applied SC Physics GA RT787 UT WOS:A1995RT78700038 ER PT J AU NGAI, KL ETIENNE, S ZHONG, ZZ SCHUELE, DE AF NGAI, KL ETIENNE, S ZHONG, ZZ SCHUELE, DE TI EFFECT OF ALKYL CHAIN SPACER LENGTH ON THE DYNAMICS OF GLASS-TRANSITION IN SIDE-CHAIN LIQUID-CRYSTALLINE POLYMERS SO MACROMOLECULES LA English DT Article ID LOW-MOLECULAR-WEIGHT; COMPARATIVE DIELECTRIC INVESTIGATIONS; SEGMENTAL RELAXATION; AMORPHOUS POLYMERS; VISCOELASTIC PROPERTIES; TEMPERATURE-DEPENDENCE; POLYMETHACRYLATES; MOTION; BLENDS AB The influence of the flexible alkyl chain spacer on the molecular dynamics of glass transition in side-chain liquid-crystalline polymers (SCLCPs) and its dependence on the spacer length are considered in the framework of the Coupling model. Short spacer length may enable the mesogenic groups in the side chain to enhance the degree of cooperativity of the segmental dynamics responsible for glass transition compared with that of the corresponding parent main-chain polymer without the side chains. However, when the spacer length becomes long, not only motions of the mesogenic group and the main chain are decoupled but also the preponderance of flexible methylene chains in the vicinity of the polymer backbone will diminish the degree of cooperativity of the segmental dynamics compared with that of the corresponding parent main-chain polymer without the side chain. The degree of cooperativity is quantified in the coupling model for SCLCPs by the steepness of the plot of a characteristic relaxation time, tau*, of the segmental relaxation time spectrum against normalized reciprocal temperature, T-g/T, where T-g is operationally defined as the temperature at which tau*(T-g) is equal to an arbitrarily chosen but fixed long time. Dielectric and mechanical relaxation data of several families of SCLCPs published in the past 10 years are used to test this prediction. The results from the analysis of these data are in accord with the predicted trends. C1 ECOLE MINES,MET PHYS & SCI MAT LAB,CNRS,URA 155,F-54042 NANCY,FRANCE. CASE WESTERN RESERVE UNIV,DEPT PHYS,CLEVELAND,OH 44106. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 67 TC 18 Z9 18 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 11 PY 1995 VL 28 IS 19 BP 6423 EP 6431 DI 10.1021/ma00123a006 PG 9 WC Polymer Science SC Polymer Science GA RV942 UT WOS:A1995RV94200006 ER PT J AU PLAZEK, DJ CHAY, IC NGAI, KL ROLAND, CM AF PLAZEK, DJ CHAY, IC NGAI, KL ROLAND, CM TI VISCOELASTIC PROPERTIES OF POLYMERS .4. THERMORHEOLOGICAL COMPLEXITY OF THE SOFTENING DISPERSION IN POLYISOBUTYLENE SO MACROMOLECULES LA English DT Article ID AMORPHOUS POLYMERS; TEMPERATURE DEPENDENCES; POLYISOPRENE; RELAXATION; DYNAMICS; BEHAVIOR; MOTION; STATE AB The viscoelastic behavior of a high molecular weight polyisobutylene has been revisited to investigate the unique high-frequency peak (or shoulder) seen in the loss tangent behavior in the glass to rubber softening dispersion. Creep measurements made in the temperature range -74 to +27 degrees C were initially reduced to a curve, which, upon transformation from the time to the frequency domains, yielded a loss tangent peak with no hint of any shoulder. The original creep compliance curves were rescrutinized independently, and slight variations in the derivatives of the curves revealed the elusive high-frequency loss peak. Additional dynamic measurements were made to connect the transformed creep data to some of the original Fitzgerald, Grandine, and Ferry data [J. Appl.Phys. 1953, 24, 911]. The combined results cover over 9 decades of frequency. This extensive range revealed that the mechanisms contributing to the high-frequency peak have a different temperature dependence than that of those contributing to the main loss peak. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PLAZEK, DJ (reprint author), UNIV PITTSBURGH,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15261, USA. NR 40 TC 146 Z9 146 U1 2 U2 23 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 11 PY 1995 VL 28 IS 19 BP 6432 EP 6436 DI 10.1021/ma00123a007 PG 5 WC Polymer Science SC Polymer Science GA RV942 UT WOS:A1995RV94200007 ER PT J AU SCHROEDER, PC ULMER, MP MATZ, SM GRABELSKY, DA PURCELL, WR GROVE, JE JOHNSON, WN KINZER, RL KURFESS, JD STRICKMAN, MS JUNG, GV AF SCHROEDER, PC ULMER, MP MATZ, SM GRABELSKY, DA PURCELL, WR GROVE, JE JOHNSON, WN KINZER, RL KURFESS, JD STRICKMAN, MS JUNG, GV TI OSSE UPPER LIMITS TO PULSAR GAMMA-RAY EMISSION SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA RAYS, OBSERVATIONS; PULSARS, GENERAL ID GLOBULAR-CLUSTER 47-TUCANAE AB We present upper limits from CGRO Oriented Scintillation Spectrometer Experiment (OSSE) observations of pulsars and a summary of pulsar observations made with the Compton Gamma Ray Observatory (CGRO). We also report an upper limit to phase-averaged emission for the globular cluster 47 Tuc which is thought to contain many millisecond pulsars. The 2 sigma upper limit is 3 x 10(-5) photons cm(-2) s(-1) keV(-1) in the 50-150 keV energy range. The best predictor of a pulsar having a detectable gamma-ray emission appears to be the X-ray luminosities observed by the Rontgen Satellite (ROSAT) (similar to 0.1-2.4 keV) or the Einstein satellite (similar to 0.1-4.0 keV). We compare the gamma-ray data to models related to the inferred magnetic field, the spin-down rate, and/or the frequency. Apparent correlations indicated by the pulsars detected by OSSE and the CGRO Energetic Gamma-Ray Experiment Telescope (EGRET) have counterexamples in all cases. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. UNIV SPACE RES ASSOC, WASHINGTON, DC 20375 USA. RP SCHROEDER, PC (reprint author), NORTHWESTERN UNIV, DEPT PHYS & ASTRON, EVANSTON, IL 60208 USA. RI Johnson, Neil/G-3309-2014 NR 28 TC 18 Z9 18 U1 0 U2 0 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 SEP 10 PY 1995 VL 450 IS 2 BP 784 EP 790 DI 10.1086/176183 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT244 UT WOS:A1995RT24400026 ER PT J AU LEISING, MD JOHNSON, WN KURFESS, JD CLAYTON, DD GRABELSKY, DA JUNG, GV KINZER, RL PURCELL, WR STRICKMAN, MS THE, LS ULMER, MP AF LEISING, MD JOHNSON, WN KURFESS, JD CLAYTON, DD GRABELSKY, DA JUNG, GV KINZER, RL PURCELL, WR STRICKMAN, MS THE, LS ULMER, MP TI COMPTON GAMMA-RAY OBSERVATORY OSSE OBSERVATIONS OF SN 1991T SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA RAYS, OBSERVATIONS; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; SUPERNOVAE, INDIVIDUAL (SN 1998T) ID WHITE-DWARF MODELS; IA SUPERNOVAE; LIGHT CURVES; HUBBLE CONSTANT; SN-1991T; CALIBRATION; SN-1987A; SPECTRA AB The Oriented Scintillation Spectrometer Experiment on the Compton Gamma Ray Observatory observed SN 1991T on three occasions in 1991. We find no evidence for Co-56 gamma-ray line emission from SN 1991T in any of the three observations. Combining these measurements yields a 99% confidence upper limit of 4.1-6.6 x 10(-5) cm(-2) s(-1), depending on how the multiple observations are combined, for the 847 keV line flux in the interval 66-79 days post-explosion. The distance to SN 1991T is quite uncertain, but these limits are inconsistent with some theoretical models for distances less than or equal to 10 Mpc. If we consider Type Ia supernova models at distances at which they would have apparent magnitude B = 11.6 at blue maximum, as observed for SN 1991T, then most reasonable models are consistent with our upper limits. However, if we allow for some extinction, as indicated by other observations of SN 1991T, the implied distance for a given model is smaller, the expected gamma-ray flux is higher and many models are no longer consistent with the gamma-ray limits. Others are only marginally consistent. These conclusions are significantly strengthened by combining published upper limits from the COMPTEL experiment with those reported here. Together these observations indicate that models of SN 1991T that are relatively optically bright and gamma-ray faint, perhaps because of low expansion velocities in part of the ejecta or the presence of an extended envelope, should be investigated further. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60201. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. RP LEISING, MD (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634, USA. RI Johnson, Neil/G-3309-2014 NR 40 TC 15 Z9 15 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1995 VL 450 IS 2 BP 805 EP 810 DI 10.1086/176185 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT244 UT WOS:A1995RT24400028 ER PT J AU FELDMAN, U SEELY, JF AF FELDMAN, U SEELY, JF TI RELATIONSHIP BETWEEN COLD AND HOT POST-SOLAR FLARE LOOPS AND THE IMPACT ON THE RECONNECTION FLARE MODEL SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, CORONA; SUN, FLARES; SUN, X-RAYS, GAMMA RAYS ID 7 2-RIBBON FLARE; MAGNETIC RECONNECTION; PHASE; EXPANSION AB The relationship between cold and hot postflare loops has been studied using the 1973 September 7 and 1974 January 15 flare images recorded by the Skylab S082 spectroheliograph. The images are of intense emission lines in the extreme ultraviolet region that span the 1 x 10(4) (He I) to 3.2 x 10(6) K (Ni XVIII) temperature range. The analysis of the images does not support the widely held notion that cold loops are always smaller than hot loops, lie below hot loops, and are similar in shape. It is found that the coldest and hottest loops often differ significantly in size and shape. Based on the analysis of a time sequence of Skylab images of cold and hot loops, there is no evidence that the loop system expands in a discontinuous manner, as would be the case if higher loops were sequentially formed and activated by reconnection of the magnetic field. It is found that the individual coronal loops expand in a gradual manner. These conclusions are consistent with images of postflare loop systems in the 10(7) K range that were recorded by the soft X-ray telescope on the Yohkoh spacecraft. Previous observations and interpretations of postflare loop systems, which led to the formulation of the reconnection flare model are reexamined. In light of recent high-quality imagery that spans the temperature range from 10(4) to 10(7) K, it is concluded that the observations do not support all aspects of the reconnection flare model as presently articulated. Elements of the reconnection hare model that are inconsistent with the modern observations should be reconsidered. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 22 TC 12 Z9 12 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1995 VL 450 IS 2 BP 902 EP 906 DI 10.1086/176194 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT244 UT WOS:A1995RT24400037 ER PT J AU RUSSELL, JN SARVIS, SS MORRIS, RE AF RUSSELL, JN SARVIS, SS MORRIS, RE TI ADSORPTION AND THERMAL-DECOMPOSITION OF PHENOL ON NI(110) SO SURFACE SCIENCE LA English DT Article DE ALCOHOLS; AROMATICS; AUGER ELECTRON SPECTROSCOPY; LOW INDEX SINGLE CRYSTAL SURFACES; NICKEL; SURFACE CHEMICAL REACTION; THERMAL DESORPTION; THERMAL DESORPTION SPECTROSCOPY ID OXYGEN-PRECOVERED MO(110); ENERGY-LOSS SPECTROSCOPY; SURFACE PHENOXIDE; BOND ACTIVATION; NICKEL; METHANOL; CO; CHEMISORPTION; KINETICS; HYDROGEN AB The thermal decomposition of phenol on Ni(110) between 150 and 800 K was investigated with temperature programmed desorption (TPD), low energy electron diffraction (LEED), and Auger electron spectroscopy (AES). After adsorption at 150 K, the phenol monolayer completely decomposed into H-2, CO, and adsorbed carbon upon heating to 800 K. Molecular phenol desorbed from an unreactive state at 225 K and from the multilayer at 200 K. The saturated reactive monolayer resulted in four Hz desorption states, beta(1)-beta-(4). The beta(1)-H-2 state observed between 250 and 350 K, resulted from OH bond scission and demonstrated the formation of a phenoxy species. A deuterium kinetic isotope effect (DKIE) for beta(1)-hydrogen desorption indicated that OH bond scission occurs between 250 and 350 K. However, the absence of a DKIE in the reactive adsorption at 290 K of OH/OD and CH/CD labeled phenol showed that phenol chemisorbed on Ni(110) via the pi bonds of the ring. The beta(2)-beta(4)-H-2 desorption states occurred in a continuum between 370 and 650 K and resulted from decomposition of the phenyl ring. The observation of a deuterium kinetic isotope effect for beta(2)-H-2 desorption from 2,4,6-d(3)-phenol, compared to h(6)-phenol, and 3,5-d(2)-phenol indicated that scission of the C-H bond in either the (2,6) or the 4 position on the ring was the rate limiting step. CO desorption began near 400 K, and continued to about 650 K, exhibiting the same general thermal desorption distribution as the beta(2)-beta(4)-H-2 desorption spectrum. In CO desorption, a DKIE indicated CH bond scission influenced the decomposition of the C-C bonds in the ring which resulted in CO production. C-13 labeling revealed that 60% of the CO bond units remained intact. At 650 K, the carbon residue had a graphitic Auger lineshape, and exhibited a LEED pattern that is consistent with graphite microcrystallites. The surface C dissolved into the bulk above 700 K. RP RUSSELL, JN (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. RI Russell, John/A-3621-2009 NR 38 TC 22 Z9 22 U1 2 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD SEP 10 PY 1995 VL 338 IS 1-3 BP 189 EP 203 DI 10.1016/0039-6028(95)00571-4 PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RU492 UT WOS:A1995RU49200030 ER PT J AU RICE, JK LOVAS, FJ FRASER, GT SUENRAM, RD AF RICE, JK LOVAS, FJ FRASER, GT SUENRAM, RD TI PULSED-NOZZLE FOURIER-TRANSFORM MICROWAVE INVESTIGATION OF THE LARGE-AMPLITUDE MOTIONS IN HBR-CO2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-STRUCTURE; HF-HCL; COMPLEXES; SPECTRUM; OH; SPECTROSCOPY; H+CO2; DISTRIBUTIONS; H+CO2->OH+CO; REACTANTS AB Microwave spectra of (HBr)-Br-79-CO2 and (HBr)-Br-81-CO2 and their D and O-18 isotopomers have been measured using a pulsed-nozzle Fourier-transform microwave spectrometer, The spectra are consistent with a T-shaped Br-CO2 geometry, as concluded previously by Zeng et al. [Y. P. Zeng, S. W. Sharpe, S. K. Shin, C. Wittig, and R. A. Beaudet, J. Chem. Phys. 97, 5392 (1992)] from an investigation of the rotationally resolved infrared spectrum of the asymmetric C=O stretching vibration of the complex. Only b-type K-a = 1<--0 transitions are observed, with the symmetry-allowed a-type Delta K-a = 0 transitions being too weak to be detected. The absence of a strong a-type spectrum implies that the HBr axis is nearly parallel to the b-inertial axis of the complex, which itself is parallel to the C-infinity axis of the CO2. The K-a = 1<--0 energy level spacing is approximately 1.2 GHz larger than that predicted from the infrared rotational constants due to an additional contribution to the splitting arising from the hindered-rotation tunneling of the HBr through a C-s or C-2v transition state. Because the Bose-Einstein statistics of the spin-zero oxygen nuclei allow only symmetric tunneling states for K-a even and antisymmetric tunneling states for K-a odd, no doubling of the lines is observed. No evidence was obtained for this tunneling motion in the infrared spectrum of Zeng et al., since the tunneling state selection rules are symmetricttsymmetric and antisymmetric<-->antisymmetric for the band studied. A dynamical modeling of the Br-79 and Br-81 nuclear quadrupole coupling constants gives an equilibrium angle CBrH angle of similar to 103 degrees and an HBr zero-point bending amplitude of similar to 24 degrees. The implication of this study on the interpretation of experiments on the photoinitiated reaction of H atoms with CO2 using an HBr-CO2 precursor are discussed. C1 NATL INST STAND & TECHNOL,DIV MOLEC PHYS,GAITHERSBURG,MD 20899. RP RICE, JK (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 36 TC 14 Z9 14 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 8 PY 1995 VL 103 IS 10 BP 3877 EP 3884 DI 10.1063/1.469628 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RU109 UT WOS:A1995RU10900001 ER PT J AU SEMTNER, AJ AF SEMTNER, AJ TI MODELING OCEAN CIRCULATION SO SCIENCE LA English DT Article ID GENERAL-CIRCULATION; BETA-PLANE; RESOLUTION; DISTRIBUTIONS; VARIABILITY; TURBULENCE; ATLANTIC; PACIFIC; SYSTEM AB Ocean numerical models have become quite realistic over the past several years as a result of improved methods, faster computers, and global data sets. Models now treat basin-scale to global domains while retaining the fine spatial scales that are important for modeling the transport of heat, salt, and other properties over vast distances. Simulations are reproducing observed satellite results on the energetics of strong currents and are properly showing diverse aspects of thermodynamic and dynamic ocean responses ranging from deep-water production to El Nino. Now models can represent not only currents but also the consequences for climate, biology, and geochemistry over time spans of months to decades. However, much remains to be understood from models about ocean circulation on longer time scales, including the evolution of the dominant water masses, the predictability of climate, and the ocean's influence on global change. RP USN, POSTGRAD SCH, DEPT OCEANOG, MONTEREY, CA 93943 USA. NR 35 TC 41 Z9 42 U1 0 U2 4 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD SEP 8 PY 1995 VL 269 IS 5229 BP 1379 EP 1385 DI 10.1126/science.269.5229.1379 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA RT806 UT WOS:A1995RT80600033 PM 17731147 ER PT J AU WILLIAMS, BA PAPAS, P NELSON, HH AF WILLIAMS, BA PAPAS, P NELSON, HH TI KINETICS AND PRODUCT CHANNELS OF THE REACTION CN+N2O SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID GAS-PHASE; FLUORESCENCE; CN AB The kinetics of the reaction CN + N2O --> products have been measured between 400 and 870 K. Laser photolysis of ICN at 248 nm was used to prepare CN radicals, whose decay rate as a function of partial pressure of N2O was monitored by laser-induced fluorescence. The measured bimolecular rate constants exhibit some dependence on total pressure and are approximately a factor of 3 lower than obtained in the previous study of Wang et al. [Int. J. Chem. Kinet. 1991, 23, 151], but have approximately the same temperature dependence. The results at 100 Torr are well represented by the expression 10(-10.0+/-0.4) exp(-7730+/-1300/T)+10(-14.5+/-0.4) exp(-730+/-730/T) over the temperature range 400-850 K. The branching ratio of the product channel CN+N2O --> NCO+N-2 was measured at several temperatures by comparing the amount of NCO produced between CN+N2O --> products and CN+O-2 --> NCO+O. The NCO channel is insignificant (<10% branching ratio) over the temperature range of this study. Substantial NCN product formation is observed at 587 K, consistent with NCN+NO being the primary product channel over this temperature range. Below 500 K the rate constant has a much weaker temperature dependence. These findings suggest that stabilization of the NCNNO adduct may be significant at low temperatures. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 12 TC 5 Z9 5 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 7 PY 1995 VL 99 IS 36 BP 13471 EP 13475 DI 10.1021/j100036a023 PG 5 WC Chemistry, Physical SC Chemistry GA RU476 UT WOS:A1995RU47600023 ER PT J AU ERWIN, SC AF ERWIN, SC TI NEW STRUCTURAL MODEL FOR THE ALKALI-INDUCED SI(111)-(3X1) RECONSTRUCTION FROM FIRST PRINCIPLES SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; SURFACE; ADSORPTION; SILICON; 3X1; NA; AG AB A new structural model is proposed for the alkali-induced Si(111)-(3 X 1) reconstruction, based on a natural extension of the Si(111)-(2 X 1) pi-bonded chain reconstruction. First-principles total-energy calculations for several alkali adsorbates show this model to be stable relative to previously proposed models. The calculated electronic dispersion is in quantitative agreement with photoemission data, and simulated scanning-tunneling microscopy images largely reproduce those of experiment. RP ERWIN, SC (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Erwin, Steven/B-1850-2009 NR 22 TC 59 Z9 59 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 4 PY 1995 VL 75 IS 10 BP 1973 EP 1976 DI 10.1103/PhysRevLett.75.1973 PG 4 WC Physics, Multidisciplinary SC Physics GA RR428 UT WOS:A1995RR42800026 ER PT J AU RAJAGOPAL, AK AF RAJAGOPAL, AK TI THE SOBOLEV INEQUALITY AND THE TSALLIS ENTROPIC UNCERTAINTY RELATION SO PHYSICS LETTERS A LA English DT Article AB The Heisenberg uncertainty relation is expressed in terms of the Tsallis entropies associated with the conjugate coordinate and momentum probability densities. By rewriting this in terms of a positive joint probability distribution suggested by Cohen and coworkers, a different insight into the statistical dependence of the quantum variables is obtained. A discussion of how this improves the previous results on this subject is given. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 74 Z9 75 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD SEP 4 PY 1995 VL 205 IS 1 BP 32 EP 36 DI 10.1016/0375-9601(95)00500-3 PG 5 WC Physics, Multidisciplinary SC Physics GA RT075 UT WOS:A1995RT07500007 ER PT J AU SCHENCK, HA BENTHIEN, GW AF SCHENCK, HA BENTHIEN, GW TI EFFICIENT CALCULATION AND DISPLAY OF DISPERSION-CURVES FOR A THIN CYLINDRICAL-SHELL IMMERSED IN A FLUID SO ACOUSTICAL PHYSICS LA English DT Article ID AXISYMMETRICAL WAVE-PROPAGATION; FREQUENCY RESONANCE SCATTERING; SOUND AB An efficient procedure for calculating and displaying the dispersion curves of free waves traveling on a cylindrical shell immersed in a fluid will be described. Many approaches to the calculation of the roots of a dispersion function have been taken in the past. In the case of the fluid-loaded shell, Scott [10] pointed out that some publications contain spurious results, which arise from seeking the roots of the real part of the dispersion function rather than those of the full complex function. In this work, the complications of calculating and following these roots have been simplified by using a regular computational grid for each parameter of the dispersion function, and then making the root loci evident by the appropriate use of graphics. The efficiency of computation and the effectiveness of the displays in providing a global understanding of the dispersion relations will be illustrated with several numerical examples on shells of practical interest. RP SCHENCK, HA (reprint author), USN,COMMAND CONTROL & OCEAN SURVEILLANCE CTR,DIV RDT & E,SAN DIEGO,CA 92152, USA. NR 17 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1063-7710 J9 ACOUST PHYS+ JI Acoust. Phys. PD SEP-OCT PY 1995 VL 41 IS 5 BP 731 EP 743 PG 13 WC Acoustics SC Acoustics GA RX229 UT WOS:A1995RX22900019 ER PT J AU WHITE, JL DARKO, DF BROWN, SJ MILLER, JC HAYDUK, R KELLY, T MITLER, MM AF WHITE, JL DARKO, DF BROWN, SJ MILLER, JC HAYDUK, R KELLY, T MITLER, MM TI EARLY CENTRAL-NERVOUS-SYSTEM RESPONSE TO HIV-INFECTION - SLEEP DISTORTION AND COGNITIVE-MOTOR DECREMENTS SO AIDS LA English DT Article DE HIV INFECTION; CD4+ COUNT; SLEEP; COGNITIVE-MOTOR PERFORMANCE ID HUMAN-IMMUNODEFICIENCY-VIRUS; AIDS-RELATED COMPLEX; AZIDOTHYMIDINE; MEN; INTERLEUKIN-1; DISTURBANCES; ZIDOVUDINE; DEMENTIA; TOXICITY; THERAPY AB Objective: To repeat and extend findings suggesting that sleep disturbance, excessive daytime sleepiness, and degraded cognitive-motor abilities may be early markers of central nervous system (CNS) involvement in HIV infection. Design: A controlled, cross-sectional, prospective analysis. Setting: Clinical research center at a teaching hospital and a military health research center. Subjects: Twenty-three HIV-positive (mean CD4+ count, 387+/-162x10(6)/l) and 13 seronegative men who were Naval personnel or participants of the University of California, San Diego HIV Neurobehavioral Research Center. Main outcome measures: Nocturnal and daytime sleep electroencephalogram, electromyogram, and electrocardiogram. Simple and complex cognitive-motor performance assessed via computerized tasks. Results: Comparison of sleep parameters based on HIV status, length of time infected, zidovudine use, and CD4+ count indicated that CD4+ T cells >400x10(6)/l were associated with a distortion in nocturnal sleep characterized by increased stages 3 and 4 non-rapid eye movement (i.e., slow-wave) sleep in the latter portion of the night and reduced nocturnal awakenings. HIV-positive patients were no sleepier in the daytime than controls. Cognitive-motor performance revealed deficits in both accuracy and efficiency for HIV-positive patients. Conclusion: Asymptomatic HIV-positive patients with CD4+ counts >400x10(6)/l demonstrate a statistically significant increase in slow-wave sleep during the latter portion of the night and less arousability. CD4+ lymphocyte count in the early phases of HIV infection appears to differentiate between various levels of HIV disease progression with respect to certain CNS measurements of nocturnal sleep and cognitive-motor performance. Sleep structure distortion remains one of the earliest and most consistently replicable physiological signs of HIV infection. This distortion may provide a link to immune function, disease progression, and cognitive-motor disability in HIV infection. C1 Scripps Res Inst, DEPT NEUROPHARMACOL, LA JOLLA, CA USA. SCRIPPS CLIN & RES FDN, DEPT MED, DIV PSYCHIAT, LA JOLLA, CA 92037 USA. UNIV CALIF SAN DIEGO, HIV NEUROBEHAV RES CTR, SAN DIEGO, CA 92103 USA. USN, HLTH RES CTR, SAN DIEGO, CA 92152 USA. RP WHITE, JL (reprint author), Scripps Clinic, DEPT MED, DIV SLEEP DISORDERS, N-209, 10666 N TORREY PINES RD, LA JOLLA, CA 92037 USA. FU NCRR NIH HHS [M01 RR00833]; NIMH NIH HHS [P50 MH47680, MH42762] NR 40 TC 31 Z9 33 U1 3 U2 4 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0269-9370 J9 AIDS JI Aids PD SEP PY 1995 VL 9 IS 9 BP 1043 EP 1050 DI 10.1097/00002030-199509000-00009 PG 8 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA RU013 UT WOS:A1995RU01300009 PM 8527076 ER PT J AU GERHARDT, RE GLICKMAN, JD HUGO, JP KOETHE, JD NTOSO, KA WOLF, CJ AF GERHARDT, RE GLICKMAN, JD HUGO, JP KOETHE, JD NTOSO, KA WOLF, CJ TI ANOTHER METHOD FOR CORRECTING METABOLIC ALKALOSIS - REPLY SO AMERICAN JOURNAL OF KIDNEY DISEASES LA English DT Letter C1 USN,MED CTR,DIV NEPHROL,SAN DIEGO,CA 92152. RP GERHARDT, RE (reprint author), UNIV CALIF SAN DIEGO,SCH MED,SAN DIEGO,CA 92103, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0272-6386 J9 AM J KIDNEY DIS JI Am. J. Kidney Dis. PD SEP PY 1995 VL 26 IS 3 BP 557 EP 557 DI 10.1016/0272-6386(95)90510-3 PG 1 WC Urology & Nephrology SC Urology & Nephrology GA RR920 UT WOS:A1995RR92000024 ER PT J AU SMALLIGAN, RD LANGE, WR FRAME, JD YARBOUGH, PO FRANKENFIELD, DL HYAMS, KC AF SMALLIGAN, RD LANGE, WR FRAME, JD YARBOUGH, PO FRANKENFIELD, DL HYAMS, KC TI THE RISK OF VIRAL HEPATITIS-A, HEPATITIS-B, HEPATITIS-C, AND HEPATITIS-E AMONG NORTH-AMERICAN MISSIONARIES SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID NON-A; VIRUS; CHILDREN; EPIDEMIC; ANTIBODY; HEALTH; ASSAY AB The seroprevalence and incidence of hepatitis A, B, C, and E virus infection were determined among North American missionaries (n = 328) serving in various geographic locations between 1967 and 1984. The mean age of subjects at entry into the study was 39.7 years (range 5-73 years); 65% were female; 89% had lived outside the United States before the study began. Seventy-eight percent of subjects served in sub-Saharan Africa during the study. At initial evaluation, 50.9% of the subjects had antibodies to hepatitis A virus (total anti-HAV), 8.5% to hepatitis B virus core antigen (total anti-HBc), 0.6% to hepatitis C virus (total anti-HCV by second-generation immunoblot assay), and 0% to hepatitis E virus (IgG anti-HEV). After an average period of service of 7.3 years (2,396 person-years total), 5.8% of the missionaries seroconverted to anti-HAV, 5.5% to anti-HBc, 0.6% to anti-HCV, and 0% to anti-HEV. This study indicates a relatively low risk of hepatitis C and E virus infection among missionaries while confirming the previously reported high risk of hepatitis A and B virus infection. Hepatitis A and B vaccination is recommended for long-term travelers to developing countries. C1 USN,MED RES INST,DIV EPIDEMIOL,ROCKVILLE,MD 20852. INST LENGUA ESPANOLA,SAN JOSE,COSTA RICA. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT INT HLTH,BALTIMORE,MD 21205. GENELABS TECHNOL,SAN ANTONIO,TX 78249. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DIV PUBL HLTH,BALTIMORE,MD 21205. NR 21 TC 29 Z9 29 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD SEP PY 1995 VL 53 IS 3 BP 233 EP 236 PG 4 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA RY073 UT WOS:A1995RY07300004 PM 7573702 ER PT J AU HOLMAN, S ROBINSON, R KLEIN, L PUDIMAT, PA BEARDSLEY, DJ AF HOLMAN, S ROBINSON, R KLEIN, L PUDIMAT, PA BEARDSLEY, DJ TI HYPERBARIC SOLUTION DISTRIBUTION CHARACTERISTICS FOLLOWING PENCIL POINT NEEDLE INJECTION IN A SPINAL-CORD MODEL SO ANESTHESIOLOGY LA English DT Meeting Abstract C1 USN,NATL MED CTR,DEPT ANESTHESIOL,BETHESDA,MD. NR 4 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQUARE, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD SEP PY 1995 VL 83 IS 3A SU S BP A860 EP A860 PG 1 WC Anesthesiology SC Anesthesiology GA RX685 UT WOS:A1995RX68500860 ER PT J AU SMITH, KJ SKELTON, HG YEAGER, J RUIZ, N WAGNER, KF AF SMITH, KJ SKELTON, HG YEAGER, J RUIZ, N WAGNER, KF TI METRONIDAZOLE FOR EOSINOPHILIC PUSTULAR FOLLICULITIS IN HUMAN-IMMUNODEFICIENCY-VIRUS TYPE 1-POSITIVE PATIENTS SO ARCHIVES OF DERMATOLOGY LA English DT Note ID INFECTION C1 USN,ARMED FORCES INST PATHOL,DEPT DERMATOPATHOL,WASHINGTON,DC 20306. USN,BETHESDA,MD. RP SMITH, KJ (reprint author), USA,WASHINGTON,DC 20310, USA. NR 5 TC 18 Z9 19 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-987X J9 ARCH DERMATOL JI Arch. Dermatol. PD SEP PY 1995 VL 131 IS 9 BP 1089 EP 1091 DI 10.1001/archderm.131.9.1089 PG 3 WC Dermatology SC Dermatology GA RU135 UT WOS:A1995RU13500024 PM 7661619 ER PT J AU GUDEL, M SCHMITT, JHMM BENZ, AO ELIAS, NM AF GUDEL, M SCHMITT, JHMM BENZ, AO ELIAS, NM TI THE CORONA OF THE YOUNG SOLAR ANALOG EK DRACONIS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE STARS, ACTIVITY; STARS, CORONAE; RADIO CONTINUUM, STARS; X-RAYS, STARS; STARS, INDIVIDUAL, HD 129333 ID LATE-TYPE STARS; WIDE-FIELD CAMERA; X-RAY-EMISSION; PLEIADES CLUSTER; ROTATION; EINSTEIN; RADIO; NEIGHBORHOOD; REGION; FLARE AB First coronal microwave and new soft X-ray observations of the very active, near-Zero-Age Main-Sequence (ZAMS) dG0e star EK Dra = HD 129333 show that this analog of the young Sun is more luminous in both emissions than most single M-dwarf flare stars. Variations in the 8.4 GHz flux include modulation with the optically determined rotation period of 2.7 days. This result points to a non-uniform filling of the corona with energetic electrons due to an incomplete coverage of the surface with active regions and a source volume that is not concentric with the star. The radio luminosity varying between log L(R) = 13.6 and 14.6 (L(R) in erg s(-1) Hz(-1)) shows evidence for unpolarized gyrosynchrotron flares, while strongly polarized flares were absent during the observations. This star is the first young, truly solar-like main sequence G star discovered in microwaves. Having just arrived on the main sequence, it conclusively proves that young, solar-like G stars can maintain very high levels of radio emission after their T Tau phase. The X-ray observations were obtained from the ROSAT All-Sky Survey (RASS). The average X-ray luminosity amounts to log L(X) = 29.9 (L(X) in erg s(-1)). A Raymond-Smith type plasma model fit yields two plasma components at temperatures of 1.9 and 10 MK, with volume emission measures of 1.2 and 2.5 . 10(52) cm(-3), respectively. The X-ray light curve is significantly variable, with the photon count rate from the cooler plasma being strongly modulated by the rotation period; the emission from the hotter plasma is only weakly variable. Modeling of the source distribution in the stellar corona yields electron densities of the order of 4 . 10(10) cm(-3) or higher for the cool plasma component. It indicates that a considerable portion of EK Dra's high X-ray luminosity is due to high-density plasma rather than large emission volume. Parameters for an Xray flare indicate an electron density of 1.75 . 10(11) cm(-3) and a source height of (1 - 2) . 10(10) cm, compatible with a few times the scale height of the cooler plasma component. C1 UNIV COLORADO, NIST, JOINT INST LAB ASTROPHYS, BOULDER, CO 80309 USA. MAX PLANCK INST EXTRATERR PHYS, D-85740 GARCHING, GERMANY. ETH ZENTRUM, INST ASTRON, CH-8092 ZURICH, SWITZERLAND. USN OBSERV, DEPT ASTRON, DIV INTERFEROMETRY, WASHINGTON, DC 20392 USA. RP GUDEL, M (reprint author), PAUL SCHERRER INST, WURENLINGEN & VILLIGEN, CH-5232 VILLIGEN PSI, SWITZERLAND. RI Guedel, Manuel/C-8486-2015 OI Guedel, Manuel/0000-0001-9818-0588 NR 38 TC 37 Z9 37 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD SEP PY 1995 VL 301 IS 1 BP 201 EP 212 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RU138 UT WOS:A1995RU13800023 ER PT J AU KARPEN, JT ANTIOCHOS, SK DEVORE, CR AF KARPEN, JT ANTIOCHOS, SK DEVORE, CR TI THE ROLE OF MAGNETIC RECONNECTION IN CHROMOSPHERIC ERUPTIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE METHODS, NUMERICAL; MHD; PLASMAS; SUN, CHROMOSPHERE; SUN, MAGNETIC FIELDS; VIDEOTAPES ID CURRENT SHEETS; SOLAR-FLARES; DRIVEN RECONNECTION; EXPLOSIVE EVENTS; TRANSITION; RESISTIVITY; DISSIPATION; INSTABILITY; MICROFLARES; DISRUPTION AB We investigate the hypothesis that all chromospheric eruptions are manifestations of a common magneto-hydrodynamic phenomenon occurring on different scales: the acceleration of chromospheric plasma driven by localized magnetic reconnection. Our approach is to perform 2.5-dimensional numerical simulations of shear-induced reconnection in a potential magnetic field with a central X-point above the photosphere, embedded in a model chromosphere with solar gravity and numerical resistivity. Calculations with two values of the foot-point displacement were performed by applying a localized body-force duration twice as long in one case as in the other; after the shearing was discontinued, the system was allowed to relax for an additional interval. For the stronger shear, the initial X-point lengthens upward into a current sheet which reconnects gradually for a while but then begins to undergo multiple tearing. Thereafter, several magnetic islands develop in sequence, move toward the ends of the sheet, and disappear through reconnection with the overlying or underlying field. During the relaxation stage, a new quasi-equilibrium state arises with a central magnetic island. We also performed a reference calculation with the stronger shear but with greatly reduced numerical resistivity along the boundary where the X-point and subsequent current sheet are located. This simulation confirmed our expectations for the system evolution in the ideal limit: the current sheet becomes much longer, without significant reconnection. For the weaker shear, a much shorter sheet forms initially which then shrinks smoothly through reconnection to yield an X-point relocated above its original position, quite distinct from the final state of the strong-shear case. After reviewing the dynamics and plasma properties as well as the evolving magnetic topology, we conclude that geometry, shear strength, and local resistivity must determine the dynamic signatures of chromospheric eruptions. Our model reproduces such fundamental observed features as intermittency and large velocities, as well as the approximately concurrent appearance of oppositely directed flows. We also find that reconnection in the vertical current sheet is more consistent with Sweet-Parker reconnection theory, while the rapid interaction between the magnetic islands and the background field better approximates the Petschek process. C1 USN, RES LAB, COMPUTAT PHYS & FLUID DYNAM LAB, WASHINGTON, DC 20375 USA. RP KARPEN, JT (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7670, WASHINGTON, DC 20375 USA. RI Karpen, Judith/E-1484-2012; Antiochos, Spiro/D-4668-2012; DeVore, C/A-6067-2015 OI Antiochos, Spiro/0000-0003-0176-4312; DeVore, C/0000-0002-4668-591X NR 46 TC 52 Z9 54 U1 0 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1995 VL 450 IS 1 BP 422 EP 434 DI 10.1086/176152 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RQ577 UT WOS:A1995RQ57700041 ER PT J AU FELDMAN, U DOSCHEK, GA MARISKA, JT BROWN, CM AF FELDMAN, U DOSCHEK, GA MARISKA, JT BROWN, CM TI RELATIONSHIPS BETWEEN TEMPERATURE AND EMISSION MEASURE IN SOLAR-FLARES DETERMINED FROM HIGHLY IONIZED IRON SPECTRA AND FROM BROAD-BAND X-RAY-DETECTORS SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, X-RAYS ID DIELECTRONIC SATELLITE SPECTRA; INNER-SHELL AB We compare the electron temperature and emission measure of hares at the time of maximum soft X-ray intensity derived using two different techniques: (1) from the ratio of a dielectronic Fe XXIV line to the resonance line of Fe XXV, combined with the absolute intensity of the Fe XXV line, and (2) from the ratio of the 0.5-4.0 Angstrom and 1-8 Angstrom broadband X-ray fluxes, combined with the absolute flux in one of the broadband spectral regions. The high-resolution Fe spectra are obtained with the Bragg Crystal Spectrometer experiment flown on the Japanese Yohkoh spacecraft. The broadband fluxes are obtained from Geostationary Operational Environmental Satellites (GOES). A data set of 540 X-ray magnitude C2 or brighter flares, observed by both spacecraft, is used for the analysis. Both techniques assume an isothermal plasma. The broadband temperatures are substantially fewer than the Fe XXV temperatures. We find that the maximum temperature of flares brighter than M5 exceeds 2 x 10(7) K and that the maximum temperature of flares fainter than C4 is substantially lower than 2 x 10(7) K. We find that the Fe XXV emission measure is linearly proportional to the GOES flux in the 0.5-4.0 Angstrom detector. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7670,WASHINGTON,DC 20375, USA. NR 23 TC 30 Z9 30 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1995 VL 450 IS 1 BP 441 EP 449 DI 10.1086/176154 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RQ577 UT WOS:A1995RQ57700043 ER PT J AU VRBA, FJ LUGINBUHL, CB HARTMANN, D HURLEY, K KULKARNI, S VANKERKWIJK, M PROBST, R SMITH, I KOUVELIOTOU, C MEEGAN, C FISHMAN, G AF VRBA, FJ LUGINBUHL, CB HARTMANN, D HURLEY, K KULKARNI, S VANKERKWIJK, M PROBST, R SMITH, I KOUVELIOTOU, C MEEGAN, C FISHMAN, G TI AN OPTICAL-IR COUNTERPART FOR SGR B1900+14 SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE SOFT GAMMA-RAY REPEATER SGR B1900+14; SGR OPTICAL COUNTERPARTS AB A deep optical search of the ''Network Synthesis'' localization for the SGR B1900+14 and the nearby ROSAT source error box has yielded an unusual source positionally coincident with an IRAS source. We present optical and IR data describing this source. C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. CALTECH,PASADENA,CA 91125. NATL OPT ASTRON OBSERV,TUCSON,AZ 85726. RICE UNIV,HOUSTON,TX 77251. RP VRBA, FJ (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 85 EP 88 DI 10.1007/BF00658593 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700018 ER PT J AU MATZ, SM GROVE, JE JOHNSON, WN KURFESS, JD SHARE, GH AF MATZ, SM GROVE, JE JOHNSON, WN KURFESS, JD SHARE, GH TI OSSE LIMITS ON PREBURST AND POSTBURST EMISSION SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE GAMMA-RAY BURSTS; COUNTERPARTS AB The existence of either pre- or post-burst emission can provide substantial new information about the burst source and its local environment. We have data from several events serendipitously in or near the OSSE field of view at the time of the burst. We present pre- and post-burst flux limits from one such event, GRB 940301. The OSSE data for other periods when scheduled observations have included burst locations will enable us to search for pre- and post- burst emission on many time scales. RP MATZ, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Johnson, Neil/G-3309-2014 NR 9 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 123 EP 126 DI 10.1007/BF00658600 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700025 ER PT J AU MATZ, SM GROVE, JE JOHNSON, WN KURFESS, JD SHARE, GH FISHMAN, GJ MEEGAN, CA AF MATZ, SM GROVE, JE JOHNSON, WN KURFESS, JD SHARE, GH FISHMAN, GJ MEEGAN, CA TI BATSE OSSE RAPID BURST RESPONSE SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE GAMMA-RAY BURSTS; COUNTERPARTS; INSTRUMENTATION AB The BATSE and OSSE instrument teams have modified flight software to promptly (within 2 min of trigger) slew the OSSE detectors to burst locations determined on-board by BATSE. This enables OSSE to make sensitive searches for prompt and delayed post-burst line and continuum emission above 50 keV. In the best cases our sensitivity will be more than an order of magnitude better than any other search in this energy range. We expect to slew to 1-2 bursts per month, based on the OSSE FOV and BATSE event rate. Detections or limits from continued operation of this system may provide significant constraints on burst models. As an example of the observations made using this system, we present preliminary limits for post-burst emission from GRB 950223 on several time scales. C1 USN,RES LAB,WASHINGTON,DC 20375. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. RI Johnson, Neil/G-3309-2014 NR 11 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 127 EP 130 DI 10.1007/BF00658601 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700026 ER PT J AU LUGINBUHL, CB VRBA, FJ HUDEC, R HARTMANN, D HURLEY, K BOER, M NIEL, M SOMMER, M KOUVELIOTOU, C MEEGAN, C FISHMAN, G AF LUGINBUHL, CB VRBA, FJ HUDEC, R HARTMANN, D HURLEY, K BOER, M NIEL, M SOMMER, M KOUVELIOTOU, C MEEGAN, C FISHMAN, G TI PRELIMINARY-RESULTS OF OPTICAL SEARCHES OF IPN3 LOCALIZATIONS SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE GRB OPTICAL COUNTERPARTS; OPTICAL TRANSIENTS AB We present preliminary results from deep optical searches of small (less than or equal to similar to-5 arcmin(2)) GRB error boxes determined using the Third Interplanetary Network (IPN3). Two of these fields also have been found to have historical OT events located within the IPN3 error boxes. We compare the preliminary results of these searches to those reported for the larger IPN1 error boxes. The small size of the IPN3 error boxes should allow a test of the hypothesis suggested by the IPN1 study that there are excess QSOs associated with the GRB fields. C1 ASTRON INST ONDREJOV,CR-25165 ONDREJOV,CZECH REPUBLIC. CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. CTR ETUD SPATIALE RAYONNEMENTS,TOULOUSE,FRANCE. MAX PLANCK INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY. GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL. RP LUGINBUHL, CB (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. RI Hudec, Rene/G-9018-2014; OI Boer, Michel/0000-0001-9157-4349 NR 7 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 289 EP 292 DI 10.1007/BF00658634 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700059 ER PT J AU DERMER, CD WEILER, TJ AF DERMER, CD WEILER, TJ TI COSMOLOGICAL MODELS OF GAMMA-RAY BURSTS SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 29th ESLAB Symposium on Towards the Source of Gamma-Ray Bursts CY APR 26-28, 1995 CL EUROPEAN SPACE RES & TECHNOL CTR, NOORDWIJK, NETHERLANDS SP ESLAB, ESTEC HO EUROPEAN SPACE RES & TECHNOL CTR DE GAMMA-RAY BURSTS; NEUTRON STARS; COSMOLOGY ID NEUTRON-STAR BINARIES; BLACK-HOLE BINARIES; RELATIVISTIC FIREBALLS; COSMIC FIREBALLS; MAGNETIC-FIELDS; ORIGIN; JETS; STATISTICS; MOTION; BATSE AB We review models of cosmological gamma-ray bursts (GRBs). The statistical and gamma-ray transparency issues are summarized. Neutron-star and black-hole merger scenarios are described and estimates of merger rates are summarized. We review the simple fireball models for GRBs and the recent work on non-simple fireballs. Alternative cosmological models, including models where GRBs are analogs of active galactic nuclei and where they are produced by high-field, short period pulsars, are also mentioned. The value of neutrino astronomy to solve the GRB puzzle is briefly reviewed. C1 VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235. RP DERMER, CD (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 71 TC 7 Z9 7 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD SEP PY 1995 VL 231 IS 1-2 BP 377 EP 388 DI 10.1007/BF00658654 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA TF267 UT WOS:A1995TF26700079 ER PT J AU KOSSOVSKY, N GELMAN, A HNATYSZYN, HJ RAJGURU, S GARRELL, RL TORBATI, S FREITAS, SSF CHOW, GM AF KOSSOVSKY, N GELMAN, A HNATYSZYN, HJ RAJGURU, S GARRELL, RL TORBATI, S FREITAS, SSF CHOW, GM TI SURFACE-MODIFIED DIAMOND NANOPARTICLES AS ANTIGEN DELIVERY VEHICLES SO BIOCONJUGATE CHEMISTRY LA English DT Note ID MUSSEL ADHESIVE PROTEIN; ANTIBODIES; CHEMISTRY; BINDING; WATER AB Recognition of antigens by immunocompetent cells involves inter actions that are specific to the chemical sequence and conformation of the epitope (antigenic determinant). Adjuvants that are currently used to enhance immunity to antigens tend to either alter the antigen conformation through surface adsorption or shield potentially critical determinants, e.g., functional groups. It is demonstrated here that surface-modified diamond nanoparticles (5-300 nm) provide conformational stabilization, as well as a high degree of surface exposure to protein antigens. By enhancing the availability and activity of the antigen in vivo, a strong, specific immune response can be elicited. Results are demonstrated for mussel adhesive protein (MAP), a substance for which conventional adjuvants have proven only marginally successful in evoking an immune response. Surface-modified diamond nanoparticles as antigen delivery vehicles are a novel example of the exciting marriage of materials science, chemistry, and biology. C1 UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,MOLEC INTERFACIAL INTERACT LAB,WASHINGTON,DC 20375. RP KOSSOVSKY, N (reprint author), UNIV CALIF LOS ANGELES,SCH MED,BIOMAT BIOREACTIV CHARACTERIZAT LAB,LOS ANGELES,CA 90024, USA. NR 44 TC 77 Z9 86 U1 2 U2 19 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 1043-1802 J9 BIOCONJUGATE CHEM JI Bioconjugate Chem. PD SEP-OCT PY 1995 VL 6 IS 5 BP 507 EP 511 DI 10.1021/bc00035a001 PG 5 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Multidisciplinary; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA RY634 UT WOS:A1995RY63400001 PM 8974446 ER PT J AU KARLE, IL RANGANATHAN, D AF KARLE, IL RANGANATHAN, D TI CORE DIRECTED SELF-ASSEMBLIES IN THE SOLID-STATE OF RETRO AIB BIS-PEPTIDE DICARBOXYLIC-ACIDS - A DESIGN STRATEGY FOR CONTROL OF MOLECULAR-ORIENTATION IN PEPTIDES SO BIOPOLYMERS LA English DT Article ID SUPRAMOLECULAR CHEMISTRY; PERSPECTIVES; INFORMATION AB Self-assembly patterns as a function of the central core insert in the retro bis-peptide dicarboxylic acids HO-Aib-X-Aib-OH, containing oxalyl (-CO-CO-; 1), fumaryl (-CO-CH=CH-CO-;2), and adipoyl [-CO-(CH2)(4)-CO-;3], have been characterized by single crystal x-ray diffraction analyses. Extensive hydrogen bonding occurs in each crystal but there are no OH...O bonds between acid groups. Only two types of hydrogen bonds occur in all the crystals: NH...O (acid terminal), 2.84-2.98 Angstrom and OH (acid terminal)...O (core carbonyl), 2.55-2.67 Angstrom (except for an additional intramolecular C-5 type bond in the oxalyl moiety in 1). The self-assembly patterns are a beta-network in 1, separate layer assemblies (beta-networks) for two independent molecules in 2 that combine into a three-dimensional gamma network, and separate ribbon assembles (alpha networks) for two independent molecules in 3 that combine into an extended beta-network sheet with hydrophobic faces. (C) 1995 John Wiley and Sons, Inc. C1 CSIR,REG RES LAB,BIOMOLEC RES UNIT,TRIVANDRUM 695019,KERALA,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. RI TVM, NIIST/E-5132-2012 OI TVM, NIIST/0000-0002-5814-466X FU NIGMS NIH HHS [GM 30902] NR 17 TC 18 Z9 18 U1 0 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0006-3525 J9 BIOPOLYMERS JI Biopolymers PD SEP PY 1995 VL 36 IS 3 BP 323 EP 331 DI 10.1002/bip.360360307 PG 9 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA RP450 UT WOS:A1995RP45000006 PM 7669918 ER PT J AU SELF, DJ GOPALAKRISHNAN, G KISER, WR OLIVAREZ, M AF SELF, DJ GOPALAKRISHNAN, G KISER, WR OLIVAREZ, M TI THE RELATIONSHIP OF EMPATHY TO MORAL REASONING IN FIRST-YEAR MEDICAL-STUDENTS SO CAMBRIDGE QUARTERLY OF HEALTHCARE ETHICS LA English DT Article ID JUSTICE; CARE C1 TEXAS A&M UNIV,COLL MED,DEPT PHILOSOPHY,COLLEGE STN,TX 77843. TEXAS A&M UNIV,COLL MED,DEPT PEDIAT,COLLEGE STN,TX 77843. BROWN UNIV,SCH MED,DEPT INTERNAL MED,PROVIDENCE,RI 02912. USN HOSP,FAMILY PRACTICE RESIDENCY TRAINING PROGRAM,JACKSONVILLE,AL. RP SELF, DJ (reprint author), TEXAS A&M UNIV,COLL MED,DEPT MED HUMANITIES,COLLEGE STN,TX 77843, USA. NR 21 TC 2 Z9 2 U1 1 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0963-1801 J9 CAMB Q HEALTHC ETHIC JI Camb. Q. Healthc. Ethics PD FAL PY 1995 VL 4 IS 4 BP 448 EP 453 PG 6 WC Health Care Sciences & Services; Health Policy & Services; Social Sciences, Biomedical SC Health Care Sciences & Services; Biomedical Social Sciences GA TB568 UT WOS:A1995TB56800005 PM 8563954 ER PT J AU WALDRON, A AF WALDRON, A TI SCHOLARSHIP AND PATRIOTIC EDUCATION - THE GREAT-WALL CONFERENCE, 1994 SO CHINA QUARTERLY LA English DT Note C1 BROWN UNIV, PROVIDENCE, RI 02912 USA. RP WALDRON, A (reprint author), USN WAR COLL, NEWPORT, RI 02841 USA. NR 7 TC 2 Z9 2 U1 1 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0305-7410 J9 CHINA QUART JI China Q. PD SEP PY 1995 IS 143 BP 844 EP 850 PG 7 WC Area Studies SC Area Studies GA RY008 UT WOS:A1995RY00800014 ER PT J AU SCHNELLER, RJ AF SCHNELLER, RJ TI SHARK OF THE CONFEDERACY - THE STORY OF THE CSS-ALABAMA - ROBINSON,CM SO CIVIL WAR HISTORY LA English DT Book Review RP SCHNELLER, RJ (reprint author), USN,CTR HIST,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU KENT STATE UNIV PRESS PI KENT PA KENT, OH 44242 SN 0009-8078 J9 CIVIL WAR HIST JI Civil War Hist. PD SEP PY 1995 VL 41 IS 3 BP 256 EP 258 PG 3 WC History SC History GA RW175 UT WOS:A1995RW17500014 ER PT J AU CROPSEY, S AF CROPSEY, S TI SECURITY AND SACRIFICE - ISOLATION, INTERVENTION, AND AMERICAN FOREIGN POLICY - ABRAMS,E SO COMMENTARY LA English DT Book Review RP CROPSEY, S (reprint author), USN,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER JEWISH COMMITTEE PI NEW YORK PA 165 E 56TH ST, NEW YORK, NY 10022 SN 0010-2601 J9 COMMENTARY JI Commentary PD SEP PY 1995 VL 100 IS 3 BP 59 EP 60 PG 2 WC Political Science; Social Issues SC Government & Law; Social Issues GA RQ613 UT WOS:A1995RQ61300028 ER PT J AU LOWREY, AH CRAMER, CJ URBAN, JJ FAMINI, GR AF LOWREY, AH CRAMER, CJ URBAN, JJ FAMINI, GR TI QUANTUM-CHEMICAL DESCRIPTORS FOR LINEAR SOLVATION ENERGY RELATIONSHIPS SO COMPUTERS & CHEMISTRY LA English DT Article; Proceedings Paper CT 3rd Conference on Computers in Chemistry, including the Workshop on Computational Methods for Large Molecular Systems CY JUN 23-26, 1994 CL WROCLAW, POLAND SP Polish Amer Sklodowska Curie Fdn ID WATER PARTITION-COEFFICIENTS; SOLVATOCHROMIC PARAMETERS; MOLECULAR-PROPERTIES; THEORETICAL DESCRIPTORS; PI-STAR; ALPHA; BETA; SOLUBILITY; SOLVENTS AB Linear solvation energy relationships (LSER) have been successfully used to correlate over 300 complex chemical and biochemical properties with small sets of descriptors related to fundamental characteristics of molecular structure and chemistry. This is a branch of the unnamed science (after Hansch) which is concerned with the intricate interactions between chemicals and life. Until recently, the descriptors in these relationships have been empirically determined. Recent developments in both the experimental understanding of these descriptors and in molecular orbital calculations have provided a new ground for fertile interaction between computational and experimental techniques. This manuscript describes development in the use of LSER and the recent molecular orbital formulations which provide basic descriptors developed from fundamental computational techniques. Examples from current research are presented to illustrate the expanding areas of chemistry accessible to these new ideas. C1 UNIV MINNESOTA,DEPT CHEM,MINNEAPOLIS,MN 55455. UNIV MINNESOTA,INST SUPERCOMP,MINNEAPOLIS,MN 55455. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. USA,EDGEWOOD RES DEV & ENGN CTR,INT PROGRAMS OFF,ABERDEEN PROVING GROUND,MD 21010. RP LOWREY, AH (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. RI Cramer, Christopher/B-6179-2011 OI Cramer, Christopher/0000-0001-5048-1859 NR 52 TC 26 Z9 27 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0097-8485 J9 COMPUT CHEM JI Comput. Chem. PD SEP PY 1995 VL 19 IS 3 BP 209 EP 215 DI 10.1016/0097-8485(94)00058-M PG 7 WC Chemistry, Multidisciplinary; Computer Science, Interdisciplinary Applications SC Chemistry; Computer Science GA RW142 UT WOS:A1995RW14200009 ER PT J AU Mehaffey, PC Barrett, MS Putnam, SD Jones, RN AF Mehaffey, PC Barrett, MS Putnam, SD Jones, RN TI Antigonococcal activity of 11 drugs used for therapy or prophylaxis of malaria SO DIAGNOSTIC MICROBIOLOGY AND INFECTIOUS DISEASE LA English DT Article ID FALCIPARUM AB Antibacterial agents are often used in malarial endemic areas for antimalarial prophylaxis (such as doxycycline and clindamycin). Gonococcal infections may coexist in the same geographic area, thus becoming suppressed by compounds directed toward malarial parasites. We tested 11 drugs with activity for Plasmodium species against 105 Neisseria gonorrhoeae strains. Traditional or investigational antimalarials such as arteflene (Ro 42-1611), chloroquine, primaquine, pyrimethamine, quinacrine, and quinine were observed to be inactive. Fansidar (sulfadoxine-pyrimethamine) and mefloquine possess marginal action in a minority of gonococcus strains (<10%). Doxycycline [minimum inhibitory concentration inhibiting 90% of tested strains (MIC(90)) 2 mu g/ml] and azithromycin (MIC(90), 0.5 mu g/ml) among the antibacterials were very active, indicating a dual role as antimalarial and antigonococcal agents. Thus, the gonorrhea and sexually transmitted disease epidemiologic data from geographic regions where doxycycline or newer macrolides may be used for malarial prophylaxis or therapy could be significantly altered. C1 UNIV IOWA,COLL MED,DIV MED MICROBIOL,IOWA CITY,IA 52242. USN,EPMU,SAN DIEGO,CA 92152. NR 5 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0732-8893 J9 DIAGN MICR INFEC DIS JI Diagn. Microbiol. Infect. Dis. PD SEP-OCT PY 1995 VL 23 IS 1-2 BP 11 EP 13 DI 10.1016/0732-8893(95)00148-4 PG 3 WC Infectious Diseases; Microbiology SC Infectious Diseases; Microbiology GA TM305 UT WOS:A1995TM30500002 PM 8775507 ER PT J AU BURTON, NC STEEDS, JW MEADEN, GM SHRETER, YG AF BURTON, NC STEEDS, JW MEADEN, GM SHRETER, YG TI STRAIN AND MICROSTRUCTURE VARIATION IN GRAINS OF CVD DIAMOND FILM SO DIAMOND AND RELATED MATERIALS LA English DT Article DE CATHODOLUMINESCENCE; STRAIN; MICROSTRUCTURE; MICRO-RAMAN SPECTROSCOPY ID CHEMICAL-VAPOR-DEPOSITION; OPTICAL-CENTERS; CATHODOLUMINESCENCE; GROWTH; LUMINESCENCE; PARTICLES; NITROGEN; VICINALS; DEFECTS AB Cathodoluminescence (CI), Raman spectroscopy and transmission electron microscopy (TEM) have been used to study chemical vapour deposited (CVD) diamond films. Most of this work was carried out on flame-grown CVD diamond film on a silicon substrate. CL was used to identify and map the distribution of defects in films. The CL spectra from cubo-octahedral crystallites of the flame-grown sample showed nitrogen-related 533 nm (2.326 eV) and 575 mn (2.156 eV) systems. The zero-phonon lines were found to be split into two or three components, and by correlation with Raman spectroscopy results the splitting was attributed to a surface tensile stress. A stress variation across crystallites was studied by imaging in each of these components. Below the surface of the crystallite high compressive stresses were detected by Raman spectroscopy. Another sample, grown by hot filament chemical vapour deposition, was studied mainly by TEM in order to elucidate the microstructure of these films. High densities of twins, stacking faults and dislocations were found to be correlated with particular regions of the deposit and to vary in a systematic fashion with distance from the substrate interface. An attempt has been made to present a consistent picture of stress in the cube-octahedral crystals of these samples by relating the results acquired from the different techniques used in this work. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BURTON, NC (reprint author), UNIV BRISTOL,HH WILLS PHYS LAB,TYNDALL AVE,BRISTOL BS8 1TL,AVON,ENGLAND. NR 32 TC 42 Z9 42 U1 3 U2 18 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD SEP PY 1995 VL 4 IS 10 BP 1222 EP 1234 DI 10.1016/0925-9635(95)00300-2 PG 13 WC Materials Science, Multidisciplinary SC Materials Science GA TA536 UT WOS:A1995TA53600009 ER PT J AU DUNTEMANN, TJ DRESNER, DM AF DUNTEMANN, TJ DRESNER, DM TI ACHALASIA-LIKE SYNDROME PRESENTING AFTER HIGHLY SELECTIVE VAGOTOMY SO DIGESTIVE DISEASES AND SCIENCES LA English DT Note DE DYSPHAGIA; HIGHLY SELECTIVE VAGOTOMY; ACHALASIA; PNEUMATIC DILATION; MANOMETRY ID ESOPHAGEAL RP DUNTEMANN, TJ (reprint author), USN,MED CTR,DEPT GASTROENTEROL,PORTSMOUTH,VA 23708, USA. NR 13 TC 17 Z9 18 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0163-2116 J9 DIGEST DIS SCI JI Dig. Dis. Sci. PD SEP PY 1995 VL 40 IS 9 BP 2081 EP 2083 DI 10.1007/BF02208682 PG 3 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA RX563 UT WOS:A1995RX56300037 PM 7555468 ER PT J AU HAAS, D AF HAAS, D TI APPLES AND ORANGES - AN UNWORTHY DEBATE SO EDN LA English DT Letter RP HAAS, D (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CAHNERS-DENVER PUBLISHING CO PI HIGHLANDS RANCH PA 8773 S RIDGELINE BLVD, HIGHLANDS RANCH, CO 80126-2329 SN 0012-7515 J9 EDN JI EDN PD SEP 1 PY 1995 VL 40 IS 18 BP 17 EP 17 PG 1 WC Engineering, Electrical & Electronic SC Engineering GA RT991 UT WOS:A1995RT99100002 ER PT J AU KWON, YW BERNER, JM AF KWON, YW BERNER, JM TI MICROMECHANICS MODEL FOR DAMAGE AND FAILURE ANALYSES OF LAMINATED FIBROUS COMPOSITES SO ENGINEERING FRACTURE MECHANICS LA English DT Article ID UNIDIRECTIONAL COMPOSITES; STRENGTH; STIFFNESS AB A micromechanics model was developed for damage and failure analyses of laminated fibrous composite structures. The micromechanics model computed stresses and strains at the fiber and matrix level, as well as the smeared composite stresses and strains. Damage and failure criteria used in the present study were based on the fiber and matrix stresses rather than smeared composite stresses. Progress of damage, e.g. matrix cracking and fiber breakage, as well as final failure loads were computed from the present model which was incorporated into a finite element analysis program. Some example problems were solved using the present model and the predicted results were compared to experimental results. The two results agreed very well. The model allowed the load transfer from cracked matrix to surrounding fibers until the fibers came to failure. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 34 TC 31 Z9 32 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD SEP PY 1995 VL 52 IS 2 BP 231 EP 242 DI 10.1016/0013-7944(95)00017-P PG 12 WC Mechanics SC Mechanics GA RT816 UT WOS:A1995RT81600004 ER PT J AU GANGULI, G PALMADESSO, PJ FEDDER, J LUI, ATY AF GANGULI, G PALMADESSO, PJ FEDDER, J LUI, ATY TI ROLE OF FERMI ACCELERATION IN EXPLOSIVE ENHANCEMENT OF CROSS-TAIL CURRENT IN LATE SUBSTORM GROWTH-PHASE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID PLASMA SHEET BOUNDARY; MAGNETOTAIL; WAVES; FIELD AB During the substorm growth phase, thinning of the plasma sheet can energize the unmagnetized ions trapped within it via a Fermi acceleration process. We show here that the energy growth rate, affecting mostly the unmagnetized ions, is exponential in time. The Fermi acceleration will give rise to a large enhancement in the cross-tail ion current density and would be most prominent during the late growth phase. This prediction is quite consistent with previously reported satellite observations which show that the cross-tail current density intensifies rapidly during the final stage of the growth phase just prior to current disruption. C1 JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD 20723 USA. RP USN, RES LAB, DIV PLASMA PHYS, CODE 6794, WASHINGTON, DC 20375 USA. NR 14 TC 9 Z9 9 U1 0 U2 0 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 SEP 1 PY 1995 VL 22 IS 17 BP 2405 EP 2408 DI 10.1029/95GL02488 PG 4 WC Geosciences, Multidisciplinary SC Geology GA RT829 UT WOS:A1995RT82900021 ER PT J AU BALLESTER, GE HARRIS, WM GLADSTONE, GR CLARKE, JT PRANGE, R FELDMAN, PD COMBI, MR EMERICH, C STROBEL, DF TALAVERA, A BUDZIEN, SA VINCENT, MB LIVENGOOD, TA JESSUP, KL MCGRATH, MA HALL, DT AJELLO, JM BENJAFFEL, L REGO, D FIREMAN, G WOODNEY, L MILLER, S LIU, X AF BALLESTER, GE HARRIS, WM GLADSTONE, GR CLARKE, JT PRANGE, R FELDMAN, PD COMBI, MR EMERICH, C STROBEL, DF TALAVERA, A BUDZIEN, SA VINCENT, MB LIVENGOOD, TA JESSUP, KL MCGRATH, MA HALL, DT AJELLO, JM BENJAFFEL, L REGO, D FIREMAN, G WOODNEY, L MILLER, S LIU, X TI FAR-UV EMISSIONS FROM THE SL9 IMPACTS WITH JUPITER SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID DAYGLOW AB Observations with the International Ultraviolet Explorer (IUE) during the impacts of the fragments of comet D/Shoemaker-Levy 9 with Jupiter show far-UV emissions from the impact sites within a similar to 10 min time scale. Positive detections of H-2 Lyman and Werner band (1230-1620 Angstrom) and H-Ly alpha emissions are made for impacts K and S, and marginally for P2. No thermal continuum is observed. The radiated far-UV output was >10(21) ergs. The H-2 spectrum is consistent with electron collisional excitation if significant CH4 absorption is included. Such emissions could result from plasma processes generated by the impacts. Non-thermal excitation by the high altitude entry and explosion shocks may also be relevant. Emissions by Al+ (1671 Angstrom) and C (1657 Angstrom) of cometary origin are tentatively identified. C1 SW RES INST, SAN ANTONIO, TX USA. INST ASTROPHYS SPATIALE, ORSAY, FRANCE. INST ASTROPHYS PARIS, PARIS, FRANCE. JOHNS HOPKINS UNIV, BALTIMORE, MD USA. IUE OBSERV, MADRID, SPAIN. USN, RES LAB, WASHINGTON, DC 20375 USA. GODDARD SPACE FLIGHT CTR, GREENBELT, MD USA. SPACE TELESCOPE SCI INST, BALTIMORE, MD USA. JET PROP LAB, PASADENA, CA USA. COMP SCI CORP, LANHAM, MD USA. UNIV MARYLAND, COLLEGE PK, MD USA. UCL, LONDON, ENGLAND. RP BALLESTER, GE (reprint author), UNIV MICHIGAN, DEPT ATMOSPHER OCEAN & SPACE SCI, SPACE PHYS RES LAB, 2455 HAYWARD, ANN ARBOR, MI 48109 USA. RI Livengood, Timothy/C-8512-2012; Combi, Michael/J-1697-2012; Clarke, John/C-8644-2013 OI Combi, Michael/0000-0002-9805-0078; NR 21 TC 3 Z9 3 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 1 PY 1995 VL 22 IS 17 BP 2425 EP 2428 DI 10.1029/95GL02422 PG 4 WC Geosciences, Multidisciplinary SC Geology GA RT829 UT WOS:A1995RT82900026 ER PT J AU Brannick, MT Prince, A Prince, C Salas, E AF Brannick, MT Prince, A Prince, C Salas, E TI The measurement of team process SO HUMAN FACTORS LA English DT Article ID CONSTRUCT-VALIDITY; PERFORMANCE; RATINGS; MODEL AB The construct validity of measures of team process was evaluated using predictive, known groups and multitrait-multimethod (MTMM) validation strategies. Military air crews (N = 51) flew two simulated missions. Independent judges provided evaluations of the same six team process variables in both scenarios. An MTMM analysis of judges' ratings treating judges as a method variable showed good convergent and discriminant validity. Judges' mean ratings of the six process variables were correlated with mission effectiveness. Some process measures discriminated between student and instructor teams, thus showing discrimination between known groups. Conversely, an MTMM analysis of ratings treating scenarios as a method showed poor convergent validity. We concluded that important team process behaviors have been identified and can be rated validly but that multiple observations are necessary to assess characteristics of individual teams with any accuracy. The discussion includes implications for practice and future research. C1 USN,CTR AIR WARFARE,ORLANDO,FL. RP Brannick, MT (reprint author), UNIV S FLORIDA,DEPT PSYCHOL,TAMPA,FL 33620, USA. NR 33 TC 53 Z9 55 U1 13 U2 20 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD SEP PY 1995 VL 37 IS 3 BP 641 EP 651 DI 10.1518/001872095779049372 PG 11 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA TN436 UT WOS:A1995TN43600015 PM 11536716 ER PT J AU POLACHEK, H AF POLACHEK, H TI HISTORY OF THE JOURNAL MATHEMATICAL-TABLES-AND-OTHER-AIDS-TO-COMPUTATION, 1959-1965 SO IEEE ANNALS OF THE HISTORY OF COMPUTING LA English DT Article AB The journal Mathematical Tables and other Aids to Computation was founded by Professor Raymond Clare Archibald in 1943. It was published by the National Research Council of the National Academy of Sciences. For a time it was the only journal dealing exclusively with computation and computing devices. In its July 1946 issue it published the landmark article ''The Electronic Numerical Integrator and Computer (ENIAC)'' by Herman H. Goldstine and Adele Goldstine, which described in detail the first large-scale electronic computer, the ENIAC. This article discusses the history of Mathematical Tables and other Aids to Computation during the years 1959 through 1965, a period in which major changes took place in the publication of the journal. Among these were the transfer of publication from the National Research Council to the American Mathematical Society and the change in the name of the journal to Mathematics of Computation. C1 USN,CTR SHIP RES & DEV,APPL MATH LAB,CARDEROCK,MD. NR 9 TC 3 Z9 3 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 1058-6180 J9 IEEE ANN HIST COMPUT JI IEEE Ann. Hist. Comput. PD FAL PY 1995 VL 17 IS 3 BP 67 EP 74 DI 10.1109/85.397062 PG 8 WC Computer Science, Theory & Methods; History & Philosophy Of Science SC Computer Science; History & Philosophy of Science GA RK348 UT WOS:A1995RK34800006 ER PT J AU ROSENBLUM, LJ BRYSON, S FEINER, SK AF ROSENBLUM, LJ BRYSON, S FEINER, SK TI VIRTUAL-REALITY UNBOUND SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Article C1 OFF NAVAL RES,ARLINGTON,VA 22217. NASA,AMES RES CTR,DIV NUMER AERODYNAM SIMULAT SYST,APPL RES OFF,MOFFETT FIELD,CA 94035. COLUMBIA UNIV,COMP GRAPH & USER INTERFACES LAB,NEW YORK,NY 10027. USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375. NR 0 TC 6 Z9 6 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD SEP PY 1995 VL 15 IS 5 BP 19 EP 21 PG 3 WC Computer Science, Software Engineering SC Computer Science GA RQ198 UT WOS:A1995RQ19800005 ER PT J AU MACEDONIA, MR ZYDA, MJ PRATT, DR BRUTZMAN, DP BARHAM, PT AF MACEDONIA, MR ZYDA, MJ PRATT, DR BRUTZMAN, DP BARHAM, PT TI EXPLOITING REALITY WITH MULTICAST GROUPS SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Article C1 USN,POSTGRAD SCH,DEPT COMP SCI,NPSNET TECH RES STAFF,MONTEREY,CA 93943. RP MACEDONIA, MR (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,INTERDISCIPLINARY ACAD GRP,MONTEREY,CA 93943, USA. NR 10 TC 75 Z9 79 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD SEP PY 1995 VL 15 IS 5 BP 38 EP 45 DI 10.1109/38.403826 PG 8 WC Computer Science, Software Engineering SC Computer Science GA RQ198 UT WOS:A1995RQ19800008 ER PT J AU PHILLIPS, PM NEIDERT, RE MALSAWMA, L HOR, C AF PHILLIPS, PM NEIDERT, RE MALSAWMA, L HOR, C TI MICROWAVE TRIODE AMPLIFIERS FROM 1 TO 2 GHZ USING MOLYBDENUM THIN-FILM-FIELD-EMISSION CATHODE DEVICES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB Experimental results are presented on microwave amplifiers using Molybdenum Thin-Film-Field-Emission cathode devices, fabricated at Stanford Research Institute (SRI). A device having 250 tips, operating at 4.8 mA of current with g(m) = 840 mu S is inferred to have an intrinsic power gain of 7 dB at 1.1 GHz. Other results are given for frequencies up to 1.7 GHz. For die first time, device and circuit modeling of sufficient accuracy has been performed that Tt is possible to confidently deduce the intrinsic performance parameters of the FE devices. The importance of integrated matching circuits for optimum power gain performance is exposed and quantified. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PHILLIPS, PM (reprint author), SCI APPLICAT INT CORP,MCLEAN,VA 22102, USA. NR 8 TC 15 Z9 15 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD SEP PY 1995 VL 42 IS 9 BP 1674 EP 1680 DI 10.1109/16.405283 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA RQ561 UT WOS:A1995RQ56100015 ER PT J AU MALOUF, PM GRANATSTEIN, VL PARK, SY PARK, GS ARMSTRONG, GM AF MALOUF, PM GRANATSTEIN, VL PARK, SY PARK, GS ARMSTRONG, GM TI PERFORMANCE OF A WIDE-BAND, 3-STAGE, MIXED GEOMETRY GYROTWYSTRON AMPLIFIER SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID 3-CAVITY GYROKLYSTRON AMPLIFIER; STABILITY AB A three-stage, mixed geometry gyrotwystron amplifier has recently been operated and characterized at 4.5 GHz. Gyrotwystrons are hybrids of the gyroklystron and gyro-traveling-wave tube (gyro-TWT) amplifiers. In the device which was studied, the first two stages were tunable rectangular resonator cavities, and the third (output) stage was a circular cylindrical waveguide traveling wave section. All three stages operate in fundamental mode, and are separated by cut-off drift regions. This experiment was conceived as an extension of a previous three-cavity gyroklystron experiment, the motivation being to improve upon the gyroklystron instantaneous bandwidth of 0.4% while not sacrificing efficiency or gain. Measurements of gyrotwystron performance showed a 1.5% instantaneous bandwidth, a fourfold increase over that of the gyroklystron. The gain-bandwidth product of the gyrotwystron exceeded that of the gyroklystron by a factor of 6. C1 OMEGA P INC,NEW HAVEN,CT 06520. UNIV MARYLAND,INST PLASMA RES,COLLEGE PK,MD 20742. USN,RES LAB,DIV ELECTR SCI & TECHNOL,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375. RI Park, Gunsik/A-1415-2014 NR 15 TC 9 Z9 9 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD SEP PY 1995 VL 42 IS 9 BP 1681 EP 1685 DI 10.1109/16.405284 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA RQ561 UT WOS:A1995RQ56100016 ER PT J AU ZALESKI, A SINHA, SP IOANNOU, DE CAMPISI, GJ HUGHES, HL AF ZALESKI, A SINHA, SP IOANNOU, DE CAMPISI, GJ HUGHES, HL TI OPPOSITE-CHANNEL-BASED CHARGE INJECTION IN SOI MOSFETS UNDER HOT-CARRIER STRESS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Note ID THRESHOLD; FRONT AB By operating one channel of a typical SOI MOSFET in avalanche while keeping the opposite channel accumulated, charge injection into the opposite gate takes place. Three independent experiments are described that demonstrate the occurrence of this opposite-channel-based charge injection. The experimental results are in agreement with PISCES numerical simulations. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ZALESKI, A (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 13 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD SEP PY 1995 VL 42 IS 9 BP 1697 EP 1700 DI 10.1109/16.405288 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA RQ561 UT WOS:A1995RQ56100020 ER PT J AU SUDHOFF, SD CORZINE, KA HEGNER, HJ AF SUDHOFF, SD CORZINE, KA HEGNER, HJ TI A FLUX-WEAKENING STRATEGY FOR CURRENT-REGULATED SURFACE-MOUNTED PERMANENT-MAGNET MACHINE DRIVES SO IEEE TRANSACTIONS ON ENERGY CONVERSION LA English DT Article ID BRUSHLESS DC MOTORS; PERFORMANCE AB Permanent-magnet synchronous machines fed from current-regulated converters feature nearly ideal performance at low-to-moderate speeds. However, as rotor speed increases the back emf rises which results in loss of current regulation and decreased torque. In buried-magnet machine drives, flux weakening is often used to extend the speed range. This paper sets forth a flux-weakening control specifically designed for surface-mounted permanent-magnet machines which is simple and does not require knowledge of the machine or system parameters. The proposed method is demonstrated both experimentally and through the use of computer simulation. C1 USN,CTR SURFACE WARFARE,ANNAPOLIS DETACHMENT,CARDEROCK DIV,ANNAPOLIS,MD 21402. RP SUDHOFF, SD (reprint author), UNIV MISSOURI,SCH ELECT ENGN,ROLLA,MO 65401, USA. NR 9 TC 46 Z9 47 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8969 J9 IEEE T ENERGY CONVER JI IEEE Trans. Energy Convers. PD SEP PY 1995 VL 10 IS 3 BP 431 EP 437 DI 10.1109/60.464865 PG 7 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA RX287 UT WOS:A1995RX28700008 ER PT J AU CORZINE, KA SUDHOFF, SD HEGNER, HJ AF CORZINE, KA SUDHOFF, SD HEGNER, HJ TI ANALYSIS OF A CURRENT-REGULATED BRUSHLESS DC DRIVE SO IEEE TRANSACTIONS ON ENERGY CONVERSION LA English DT Article ID PERFORMANCE AB Current-regulated brushless de machines are used in a wide variety of applications including robotics, actuators, electric vehicles, and recently, ship propulsion systems. When conducting system analysis of this or any other type of drive, average-value reduced-order models are invaluable since they provide a means of rapidly predicting the electromechanical dynamics and are readily linearized for control system synthesis. In this paper, a highly accurate average-value reduced-order model of a hysteresis current-regulated;brushless de drive is set fourth. In so doing, it is demonstrated that the drive exhibits five distinct operating modes. The physical cause of each of these modes is explained and a mathematical model for each mode is set fourth. The mathematical models are verified both experimentally and through the use of computer simulation. It has been found that the model set fourth herein is on the order of 300 times faster than a detailed computer simulation in calculating electromechanical transients. C1 USN,CTR SURFACE WARFARE,ANNAPOLIS DETACHMENT,CARDEROCK DIV,ANNAPOLIS,MD 21402. RP CORZINE, KA (reprint author), UNIV MISSOURI,SCH ELECT ENGN,ROLLA,MO 65401, USA. NR 6 TC 13 Z9 15 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8969 J9 IEEE T ENERGY CONVER JI IEEE Trans. Energy Convers. PD SEP PY 1995 VL 10 IS 3 BP 438 EP 445 DI 10.1109/60.464866 PG 8 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA RX287 UT WOS:A1995RX28700009 ER PT J AU AINSWORTH, TL CHUBB, SR FUSINA, RA GOLDSTEIN, RM JANSEN, RW LEE, JS VALENZUELA, GR AF AINSWORTH, TL CHUBB, SR FUSINA, RA GOLDSTEIN, RM JANSEN, RW LEE, JS VALENZUELA, GR TI INSAR IMAGERY OF SURFACE CURRENTS, WAVE-FIELDS, AND FRONTS SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article; Proceedings Paper CT 14th Annual International Geoscience and Remote Sensing Symposium (IGARSS 94) CY AUG 08-12, 1994 CL CALIF INST TECHNOL, PASADENA, CA SP IEEE, Geosci & Remote Sensing Soc, Int Union Radio Sci, Opt Soc Amer HO CALIF INST TECHNOL ID RADAR AB We demonstrate the ability of interferometric radar imagery to determine both relative and absolute surface velocities in the open ocean. Absolute phase calibration is accomplished by noting the azimuthal displacement of range-travelling targets-demonstrating for the first time that under favorable circumstances phase calibration can be achieved in open-ocean in the absence of ground truth. The high resolution of radar imagery permits observation of sharp velocity discontinuities, e.g. the Gulf Stream boundary and the wave held. The recent SIR-C/X-SAR shuttle missions dramatically emphasize the experimental and observational aspects of space-based radar. The combination of absolute velocities, high spatial resolution, and wide-area coverage suggest that interferometric radar imagery can provide a unique and powerful aid both for studies of global circulation patterns and detailed analysis of slope/shelf water interactions with ocean currents. In particular, we employ this measurement of the surface currents and wave field near a velocity front to help refine and bound results of our modeling of calculated radar images of the front. The results of this paper are compared with available ground truth. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. CALTECH,JET PROP LAB,PASADENA,CA 91109. RP AINSWORTH, TL (reprint author), COMPUTAT PHYS INC,FAIRFAX,VA 22031, USA. NR 12 TC 14 Z9 15 U1 2 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD SEP PY 1995 VL 33 IS 5 BP 1117 EP 1123 DI 10.1109/36.469475 PG 7 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA TB578 UT WOS:A1995TB57800004 ER PT J AU COLE, JB AF COLE, JB TI A HIGH-ACCURACY FDTD ALGORITHM TO SOLVE MICROWAVE PROPAGATION AND SCATTERING PROBLEMS ON A COARSE GRID SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB If the spatial variation of electric permittivity and magnetic permeability is ''small'' Maxwell's equations can be approximated by the scalar wave equation in each field component, We introduce a new high-accuracy second order finite-difference time-domain (FDTD) algorithm to solve the scalar wave equation on a coarse grid with a solution error less than 10(-4) that of the conventional one. The computational load at each grid point is greater, but it is more than offset by a large reduction in the number of grid points needed, as well as by a reduction in the number of iterations. Also boundaries can be more accurately characterized at the subgrid level. Although optimum performance is achieved at a fixed frequency, the accuracy is still much higher than that of a conventional FDTD algorithm over ''moderate'' bandwidths. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 7 TC 37 Z9 37 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1995 VL 43 IS 9 BP 2053 EP 2058 DI 10.1109/22.414540 PN 1 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA RU478 UT WOS:A1995RU47800009 ER PT J AU ESMAN, RD MARRONE, MJ AF ESMAN, RD MARRONE, MJ TI PASSIVE ELIMINATION OF POLARIZATION SENSITIVITY OF FIBEROPTIC MICROWAVE MODULATORS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID INTERFEROMETERS; CONFIGURATION; AMPLIFIER; SENSORS AB The polarization sensitivity of a bidirectional fiberoptic modulator is passively eliminated by incorporating the modulator in an orthoconjugate loop mirror or in an in-line fiber loop. We describe and analyze these fiber loop configurations which allow remote interrogation of polarization-sensitive devices with either one or two conventional singlemode fibers. For bulk single-drive modulators, the polarization sensitivity is reduced to +/-0.15 dB out to 2 GHz. By utilizing a balanced, dust-drive feed to a bidirectional traveling-wave modulator, residual polarization sensitivity of +/-2 dB is demonstrated for ultrawideband operation to 25 GHz and +/-0.3 dB for narrowbands. RP ESMAN, RD (reprint author), USN,RES LAB,OPT TECH BRANCH,FIBER OPT MICROWAVE SIGNAL PROC SECT,CODE 5670,WASHINGTON,DC 20375, USA. NR 22 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1995 VL 43 IS 9 BP 2208 EP 2213 DI 10.1109/22.414566 PN 2 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA RU479 UT WOS:A1995RU47900005 ER PT J AU GOPALAKRISHNAN, GK MOELLER, RP HOWERTON, MM BURNS, WK WILLIAMS, KJ ESMAN, RD AF GOPALAKRISHNAN, GK MOELLER, RP HOWERTON, MM BURNS, WK WILLIAMS, KJ ESMAN, RD TI A LOW-LOSS DOWNCONVERTING ANALOG FIBEROPTIC LINK SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID MODULATOR; SYSTEMS AB An analog fiber-optic link for concurrent detection and downconversion of microwave signals is reported. Optical amplification is employed in conjunction with electrical power combining of photodetectors to demonstrate link losses of 19.6 and 22.9 dB at RF carrier frequencies of 9 and 16 GHz, respectively. Analytic expressions validating the experimental observations are also developed. The link may be employed to detect phase sensitive or phase-modulated microwave signals and shows excellent potential for application in sensor systems involving remoting of an antenna element. C1 SFA INC, LANDOVER, MD 20785 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP MARYLAND ADV DEV LAB, GREENBELT, MD 20770 USA. NR 19 TC 56 Z9 56 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9480 EI 1557-9670 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1995 VL 43 IS 9 BP 2318 EP 2323 DI 10.1109/22.414584 PN 2 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA RU479 UT WOS:A1995RU47900021 ER PT J AU MULLEN, LJ VIEIRA, AJ HERCZFELD, PR CONTARINO, VM AF MULLEN, LJ VIEIRA, AJ HERCZFELD, PR CONTARINO, VM TI APPLICATION OF RADAR TECHNOLOGY TO AERIAL LIDAR SYSTEMS FOR ENHANCEMENT OF SHALLOW UNDERWATER TARGET DETECTION SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB Since microwaves do not penetrate water, RADAR, the principal tool for remote sensing of the earth and atmosphere, cannot be used directly for the detection of underwater objects. Currently, aerial light detecting and ranging (LIDAR) systems are therefore preferred for the detection and ranging of objects submerged in the sea, LIDAR provides for large area coverage at high speed, but it lacks coherent detection capability, a shortcoming that severely limits system sensitivity and underwater target contrast, In response to this problem, this paper details the merging of RADAR and LIDAR technologies in the constitution of a hybrid LIDAR-RADAR detection scheme, This new sensor configuration has reduced incoherent backscatter clutter by 17 dB in laboratory experiments and related computer simulations. C1 USN,CTR AIR WARFARE,WARMINSTER,PA 18974. RP MULLEN, LJ (reprint author), DREXEL UNIV,CTR MICROWAVE LIGHTWAVE ENGN,PHILADELPHIA,PA 19104, USA. NR 13 TC 68 Z9 73 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1995 VL 43 IS 9 BP 2370 EP 2377 DI 10.1109/22.414591 PN 2 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA RU479 UT WOS:A1995RU47900030 ER PT J AU FRANKEL, MY ESMAN, RD AF FRANKEL, MY ESMAN, RD TI TRUE TIME-DELAY FIBEROPTIC CONTROL OF AN ULTRAWIDEBAND ARRAY TRANSMITTER RECEIVER WITH MULTIBEAM CAPABILITY SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID ANTENNAS; ARCHITECTURE AB A true time-delay beamformer based on a fiber-optic dispersive prism is developed and characterized. The beamformer is used to control an ultrawideband time-steered array antenna, which is a significant improvement over inherently narrowband phased-array antennas. The time-steered transmitter antenna consists of eight broadband spiral elements in a sparsely-populated array. In transmit mode the bandwidth is microwave-component limited to 2-18 GHz. The transmitter shows an unprecedented performance with >100 degrees azimuth steering and no observed squint over the full frequency range, We also extend the beamformer functionality and demonstrate, we believe for the first time, fully-independent dual-beam dual-frequency ultrawideband antenna transmitter operation. Furthermore, the beamformer is shown to be capable of controlling the transmitter under pulsed operation with microwave pulse-widths as short as 75 ps. In the phase-steered receive mode, the antenna is component-limited to two elements and a frequency range of 6-16 GHz. However, we can still demonstrate squint-free receiver steering over >70 degrees azimuth over the full available frequency range. RP FRANKEL, MY (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5672,WASHINGTON,DC 20375, USA. NR 21 TC 89 Z9 90 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1995 VL 43 IS 9 BP 2387 EP 2394 DI 10.1109/22.414593 PN 2 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA RU479 UT WOS:A1995RU47900032 ER PT J AU BAQAR, S APPLEBEE, LA BOURGEOIS, AL AF BAQAR, S APPLEBEE, LA BOURGEOIS, AL TI IMMUNOGENICITY AND PROTECTIVE EFFICACY OF A PROTOTYPE CAMPYLOBACTER KILLED WHOLE-CELL VACCINE IN MICE SO INFECTION AND IMMUNITY LA English DT Note ID JEJUNI INFECTION; ANTIBODY; HUMANS AB The immunogenicity and efficacy of an experimental inactivated Campylobacter jejuni whole-cell (CWC) vaccine were evaluated in mice. Mice were orally immunized in a three-dose primary series (48-h intervals) at doses of 10(5), 10(7), or 10(9) CWC vaccine particles alone or in combination with 25 mu g of a mucosal adjuvant, the heat-labile enterotoxin of Escherichia coli (LT). The comparative immunogenicities of both formulations were assessed on the basis of the generation of antigen-specific antibodies in serum and intestinal secretions, and efficacy was determined by measuring the degrees of protection afforded against intestinal colonization and systemic dissemination of challenge organisms. Campylobacter-specific intestinal immunoglobulin (Ig) A responses were dependent on the use of LT, whereas IgA and IgG responses in serum were not. Colonization resistance was induced over a broad range of vaccine doses when LT was included. However, only the highest dose of CWC alone gave comparable levels of protection. Both formulations provided equivalent protection against systemic spread of challenge organisms. These results indicate that both whole-cell vaccine formulations deserve further evaluation as candidate vaccines and also highlight the potential value of mucosal adjuvants, like LT, in enteric vaccine development. RP BAQAR, S (reprint author), USN,MED RES INST,DEPT INFECT DIS,ENTER DIS PROGRAM,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 23 TC 46 Z9 51 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD SEP PY 1995 VL 63 IS 9 BP 3731 EP 3735 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA RQ792 UT WOS:A1995RQ79200076 PM 7642317 ER PT J AU ROSAKIS, AJ SHUKLA, A RAJAPAKSE, YDS AF ROSAKIS, AJ SHUKLA, A RAJAPAKSE, YDS TI A SYMPOSIUM ON THE DYNAMIC FAILURE MECHANICS OF MODERN MATERIALS - IN MEMORY OF PROFESSOR DUFFY,J. - HONORING PROFESSOR DALLY,J.W. UNIVERSITY-OF-MARYLAND AND PROFESSOR FREUND,L.B. BROWN-UNIVERSITY SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Editorial Material C1 UNIV RHODE ISL,KINGSTON,RI 02881. USN,RES OFF,WASHINGTON,DC. RP ROSAKIS, AJ (reprint author), CALTECH,PASADENA,CA 91125, USA. NR 0 TC 0 Z9 0 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PD SEP PY 1995 VL 32 IS 17-18 BP 2421 EP 2422 PG 2 WC Mechanics SC Mechanics GA RL557 UT WOS:A1995RL55700001 ER PT J AU SINGH, R SHUKLA, A ZERVAS, H AF SINGH, R SHUKLA, A ZERVAS, H TI EFFECT OF FLAWS ON THE STRESS WAVE-PROPAGATION IN PARTICULATE AGGREGATES - NEAR AND FAR-FIELD OBSERVATIONS SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article; Proceedings Paper CT International Symposium on Dynamic Failure Mechanics of Modern Materials CY 1994 CL CALIF INST TECHNOL, PASADENA, CA HO CALIF INST TECHNOL ID GRANULAR ASSEMBLIES AB An experimental study is conducted using dynamic photoelasticity and strain gage techniques to investigate transient stress fields in aggregate assemblies of circular disks. In particular, attention is focused on the effect of damage and damage growth in the particles on the dynamic load transfer process. The experimental data are analyzed to obtain the wave velocity, contact load profiles, peak load attenuation, wave dispersion and other changes in the stress fields as the dynamic load transfer process takes place. Both near and far field effects due to the presence of a flaw on the load transfer process are studied. The results show that the size and the orientation of the flaw greatly influence the load transfer process locally. However, in the far field the flaw only affects the attenuation of the peak loads without changing the wavelength of the loading pulse. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP SINGH, R (reprint author), UNIV RHODE ISL,DEPT MECH ENGN & APPL MECH,DYNAM PHOTOMECH LAB,KINGSTON,RI 02881, USA. NR 16 TC 4 Z9 4 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PD SEP PY 1995 VL 32 IS 17-18 BP 2523 EP & DI 10.1016/0020-7683(94)00281-Z PG 0 WC Mechanics SC Mechanics GA RL557 UT WOS:A1995RL55700008 ER PT J AU HEBBAR, SK PLATZER, MF LIU, DM AF HEBBAR, SK PLATZER, MF LIU, DM TI EFFECT OF CANARD OSCILLATIONS ON AN X-31A-LIKE MODEL IN PITCHING MANEUVER SO JOURNAL OF AIRCRAFT LA English DT Note RP HEBBAR, SK (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD SEP-OCT PY 1995 VL 32 IS 5 BP 1157 EP 1160 DI 10.2514/3.46855 PG 4 WC Engineering, Aerospace SC Engineering GA RY916 UT WOS:A1995RY91600039 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI LBJ AND VIETNAM - A DIFFERENT KIND OF WAR - HERRING,GC SO JOURNAL OF AMERICAN HISTORY LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ORGAN AMER HISTORIANS PI BLOOMINGTON PA 112 N BRYAN ST, BLOOMINGTON, IN 47401 SN 0021-8723 J9 J AM HIST JI J. Am. Hist. PD SEP PY 1995 VL 82 IS 2 BP 850 EP 851 DI 10.2307/2082406 PG 2 WC History SC History GA RV129 UT WOS:A1995RV12900252 ER PT J AU BINARI, SC DIETRICH, HB KELNER, G ROWLAND, LB DOVERSPIKE, K WICKENDEN, DK AF BINARI, SC DIETRICH, HB KELNER, G ROWLAND, LB DOVERSPIKE, K WICKENDEN, DK TI H, HE, AND N IMPLANT ISOLATION OF N-TYPE GAN SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The effect of ion-implantation-induced damage on the resistivity of n-type GaN has been investigated. H, He, and N ions were studied. The resistivity as a function of temperature, implant concentration, and post-implant annealing temperature has been examined. Helium implantation produced material with an as-implanted resistivity of 10(10) Omega-cm. He-implanted material remained highly resistive after an 800 degrees C furnace anneal. The damage associated with H implantation had a significant anneal stage at 250 degrees C and the details of the as-implanted resistivity were sample dependent. N implants had to be annealed at 400 degrees C to optimize the resulting resistivity but were then thermally stable to over 800 degrees C. The 300 degrees C resistivity of thermally stabilized He- and N-implanted layers was 10(4) Omega-cm, whereas for H-implanted layers the 300 degrees C resistivity was less than 10 Omega-cm. (C) 1995 American Institute of Physics. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. RP BINARI, SC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Rowland, Larry/C-4487-2008 NR 10 TC 92 Z9 96 U1 1 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1995 VL 78 IS 5 BP 3008 EP 3011 DI 10.1063/1.360712 PG 4 WC Physics, Applied SC Physics GA RR845 UT WOS:A1995RR84500017 ER PT J AU BROOK, I FRAZIER, EH AF BROOK, I FRAZIER, EH TI CLINICAL AND MICROBIOLOGICAL FEATURES OF NECROTIZING FASCIITIS SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID ANAEROBIC BACTERIOLOGY; CUTANEOUS ABSCESSES; BACTEROIDES; ORIGIN; GROWTH; COCCI AB The microbiological and clinical characteristics of 83 patients with necrotizing fasciitis (NF) treated over a period of 17 gears are presented. Bacterial growth was noted in 81 of 83 (98%) of specimens from patients with NF, Aerobic or facultative bacteria only were recovered in 8 (10%) specimens, anaerobic bacteria only were recovered in 18 (22%) specimens, and mixed aerobic-anaerobic floras were recovered in 55 (68%) specimens, In total, there were 375 isolates, 105 aerobic or facultative bacteria and 270 anaerobic bacteria, for an average of 4.6 isolates per specimen, The recovery of certain bacteria from different anatomical locations correlated with their distribution in the normal flora adjacent to the infected site, Anaerobic bacteria outnumbered aerobic bacteria at all body sites, but the highest recovery rate of anaerobes was in the buttocks, trunk, neck, external genitalia, and inguinal areas, The predominant aerobes were Stapylococcus aureus (n = 14 isolates), Escherichia coli (n = 12), and group A streptococci (n = 8), The predominant anaerobes were Peptostreptococcus spp, (n = 101), Prevotella and Porphyromonas spp, (n = 40), Bacteroides fragilis group (n = 36), and Clostridium spp, (n = 23), Certain clinical findings correlated with some bacteria: edema with B. fragilis group, Clostridium spp,, S. aureus, Prevotella spp, and group A streptococci; gas and crepitation in tissues with members of the family Enterobacteriaceae and Clostridium spp,; and foul odor with Bacteroides spp, Certain predisposing conditions correlated with some organisms: trauma with Clostridium spp,; diabetes with Bacteroids spp,, members of the family Enterobacteriaceae, and S. aureus; and immunosuppression and malignancy with Pseudomonas spp, and members of the family Enterobacteriaceae. These data highlight the polymicrobial nature of NF. C1 USN HOSP,DEPT PEDIAT & INFECT DIS,BETHESDA,MD. NR 29 TC 146 Z9 153 U1 2 U2 4 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD SEP PY 1995 VL 33 IS 9 BP 2382 EP 2387 PG 6 WC Microbiology SC Microbiology GA RP755 UT WOS:A1995RP75500026 PM 7494032 ER PT J AU DESISTO, WJ SNOW, ES VOLD, CL AF DESISTO, WJ SNOW, ES VOLD, CL TI METALORGANIC CHEMICAL-VAPOR-DEPOSITION OF YBCO THIN-FILMS ON (100)MGO SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID HETEROEPITACTIC GROWTH; SUPERCONDUCTING FILMS; YBA2CU3O7-DELTA; MICROSTRUCTURE; SRTIO3 AB Thin films of YBa2Cu3O7-x have been grown on stepped (100) MgO substrates by metalorganic chemical vapor deposition. Films 100 nm thick had superconducting transition temperatures of 88 K and critical current densities of 2 x 10(6) A/cm(2) (measured at 77 K). The films grew via screw dislocation mediated growth as evidenced by atomic force microscopy. At the initial stages of film growth, large holes between growth spirals were formed. These holes enlarged as film growth continued, and film performance declined. Films 250-300 nm thick had superconducting transition temperatures of 86 K and critical current densities of 1 x 10(6) A/cm(2) (measured at 77 K). RP DESISTO, WJ (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 14 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD SEP PY 1995 VL 154 IS 1-2 BP 68 EP 71 DI 10.1016/0022-0248(95)00127-1 PG 4 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA RU560 UT WOS:A1995RU56000011 ER PT J AU WIJEWARNASURIYA, PS LANGE, MD SIVANANTHAN, S FAURIE, JP AF WIJEWARNASURIYA, PS LANGE, MD SIVANANTHAN, S FAURIE, JP TI ANALYSIS OF LOW DOPING LIMITATION IN MOLECULAR-BEAM EPITAXIALLY GROWN HGCDTE(211)B EPITAXIAL LAYERS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 1994 US Workshop on the Physics and Chemistry of Mercury Cadmium Telluride and Other IR Materials CY OCT 04-06, 1994 CL SAN ANTONIO, TX DE HGCDTE; LIFETIMES; MOLECULAR BEAM EPITAXY; N-TYPE DOPING; TRANSPORT PROPERTIES ID DETECTOR AB We report the results of the transport properties and the recombination mecha nisms of indium-doped HgCdTe(211)B (x approximate to 23.0% +/- 2.0%) layers grown by molecular beam epitaxy. We have investigated the origin(s) of the background doping limitation in these layers. Molecular beam epitaxially grown layers exhibit excellent Hall characteristics down to indium levels of 2 x 10(15) cm(-3) Electron mobilities ranging from (2-3) x 10(5) cm(2)/v-s at 23K were obtained. Measured lifetime data fits very well with the intrinsic band-to-band recombinations. However, below 2 x 10(15) cm(-3) doping levels, mobility vs temperature curves starts to reflect nonuniformity in carrier distribution. Also, when we reduced the Hg vacancy concentration down to 10(12) cm(-3) range, by annealing at 150 degrees C, Hall characteristics shows an increase in the nonuniformity in the epilayers. It was found that after annealed at 150 degrees C, the obtained SR defect level has a different origin than the previously obtain Hg-vacancy related defect level. C1 EPI LTD,CHICAGO,IL 60680. USN,CTR AIR WARFARE,DIV WEAP,DIV RES & TECHNOL,PHYS BRANCH,CHINA LAKE,CA 93555. RP WIJEWARNASURIYA, PS (reprint author), UNIV ILLINOIS,DEPT PHYS,MICROPHYS LAB,845 W TAYLOR ST,ROOM 2236,CHICAGO,IL 60607, USA. NR 14 TC 8 Z9 8 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD SEP PY 1995 VL 24 IS 9 BP 1211 EP 1218 DI 10.1007/BF02653076 PG 8 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA RR911 UT WOS:A1995RR91100028 ER PT J AU ANTOSZEWSKI, J SEYMOUR, DJ FARAONE, L MEYER, JR HOFFMAN, CA AF ANTOSZEWSKI, J SEYMOUR, DJ FARAONE, L MEYER, JR HOFFMAN, CA TI MAGNETOTRANSPORT CHARACTERIZATION USING QUANTITATIVE MOBILITY-SPECTRUM ANALYSIS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 1994 US Workshop on the Physics and Chemistry of Mercury Cadmium Telluride and Other IR Materials CY OCT 04-06, 1994 CL SAN ANTONIO, TX DE HGCDTE; HALL MEASUREMENTS; MOBILITY SPECTRUM ANALYSIS; TRANSPORT PROPERTIES ID HGCDTE AB A quantitative mobility spectrum analysis (QMSA) of experimental Hall and resistivity data as a function of magnetic field is presented. This technique enables the conductivity contribution of bulk majority carriers to be separated from that of other species such as thermally generated minority carriers, electrons, and holes populating n and p doped regions, respectively, and two-dimensional species at surfaces aad interface layers. Starting with a suitable first trial function such as the Beck and Anderson mobility spectrum analysis (MSA), a variation on the iterative procedure of Dziuba and Gorska is used to obtain a mobility spectrum which enables the various carrier species present in the sample to be identified. The QMSA algorithm combines the fully automated execution and visually meaningful output format of MSA with the quantitative accuracy of the conventional least-squares multi-carrier fitting procedure. Examples of applications to HgCdTe infrared detector materials and InAs/GaSb quantum wells are discussed. The ultimate goal of this paper is to provide an automated, universal algorithm which may be used routinely in the analysis and interpretation of magneto-transport data for diverse semiconductor materials and bandgap engineered structures. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ANTOSZEWSKI, J (reprint author), UNIV WESTERN AUSTRALIA,DEPT ELECT & ELECTR ENGN,NEDLANDS,WA 6009,AUSTRALIA. NR 5 TC 69 Z9 70 U1 1 U2 10 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD SEP PY 1995 VL 24 IS 9 BP 1255 EP 1262 DI 10.1007/BF02653082 PG 8 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA RR911 UT WOS:A1995RR91100034 ER PT J AU Gorski, JJ Bernard, PS AF Gorski, JJ Bernard, PS TI Vorticity transport analysis of turbulent flows SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID REYNOLDS-STRESS; BOUNDARY-LAYER; MODELS AB Turbulence closure for the Reynolds averaged Navier-Stokes equations based on vorticity transport theory is investigated General expressions for the vorticity transport correlation terms in arbitrary two-dimensional mean flows are derived. Direct numerical simulation data for flow in a channel is used to evaluate the modeled terms and set unknown scales. Results are presented for a channel, flat plate boundary laver, and flow over a hill. The computed mean flow and kinetic energy compares well with numerical and physical experiments. The vorticity transport model appears to perform better than conventional Boussinesq eddy viscosity Reynolds stress models near the separated flow region on the leeward side of the hill. C1 UNIV MARYLAND,DEPT MECH ENGN,COLLEGE PK,MD 20742. RP Gorski, JJ (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,BETHESDA,MD 20084, USA. NR 24 TC 0 Z9 1 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD SEP PY 1995 VL 117 IS 3 BP 410 EP 416 DI 10.1115/1.2817277 PG 7 WC Engineering, Mechanical SC Engineering GA TT084 UT WOS:A1995TT08400013 ER PT J AU DAHLBURG, RB ANTIOCHOS, SK AF DAHLBURG, RB ANTIOCHOS, SK TI RECONNECTION OF ANTIPARALLEL MAGNETIC-FLUX TUBES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID SOLAR-FLARES; TURBULENCE; SIMULATIONS AB Many examples of solar activity, such as large two-ribbon flares and prominence eruptions, are widely believed to involve the fast reconnection of magnetic flux tubes. Because of the difficulties associated with calculating the evolution of three-dimensional (3-D) flux tubes, however, the details of the energy-release process are poorly understood. In this paper we describe our first attempts to shed light on this important process. We describe the results of 3-D numerical simulations of initially distinct magnetic flux tubes interacting via magnetic reconnection. As a typical case, we consider an initial magnetic field given by a compact support function distribution so that the initial topology consists of two antiparallel flux tubes. We then impose an initial velocity field on this system which causes the flux tubes to move toward each other. As a result of this initial velocity, the tubes first flatten against each other and an electric current sheet begins to develop at the interface between them. After approximately 10 Alfven times we observe a burst of reconnection. The turbulent kinetic energy rises dramatically as two reconnection jets form, which are aligned parallel to the initial field. The reconnection phase lasts for approximately 20 Alfven times, by which time the central region of the initial tubes has been completely dissipated so that the system now consists of four tubes that are relatively widely separated and hence stop interacting. We find that the excitation of small-scale spatial structure in the flow field depends critically on the value of the Lundquist numbers. Compressible effects are insignificant for this particular case of flux tube reconnection. The numerical simulations are carried out using a three-dimensional explicit Fourier collocation algorithm for solving the viscoresistive equations of compressible magnetohydrodynamics. We also report on the performance of a new parallelized version of the code. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP DAHLBURG, RB (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,4555 OVERLOOK AVE SW,CODE 6440,WASHINGTON,DC 20375, USA. RI Antiochos, Spiro/D-4668-2012 OI Antiochos, Spiro/0000-0003-0176-4312 NR 15 TC 16 Z9 16 U1 1 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1995 VL 100 IS A9 BP 16991 EP 16998 DI 10.1029/95JA01613 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT743 UT WOS:A1995RT74300001 ER PT J AU MAURICE, S ENGLE, IM AF MAURICE, S ENGLE, IM TI IDEALIZED SATURN MAGNETOSPHERE SHAPE AND FIELD SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID VOYAGER; PLASMA AB We construct an idealized three-dimensional model of Saturn's magnetosphere. The total magnetospheric field is a sum of three contributions; the first two contributions are internal, in the form of a planetary dipole and an equatorial ring current deduced from Voyager observations. We concentrate on the third contribution, resulting from the interaction of the solar wind with the Kronian magnetosphere. From the balance between the solar wind ram pressure and the magnetospheric pressure, we provide simultaneously models of the magnetopause and of the magnetic field due to the surface currents on the magnetopause. The resulting magnetopause has characteristics intermediate between those of analogous Earth and Jupiter magnetospheric models. A natural day-night asymmetry arises in the total magnetospheric field. Its intensity is tested with Voyager 1 data: the third contribution improves the agreement between data and models in the outer magnetosphere. This work extends the range of, physically reliable model of Saturn's magnetosphere in latitudinal and longitudinal directions from regions where there have been observations to regions where there have not. We discuss several possible applications, particularly some relevant to the future Cassini mission. C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP MAURICE, S (reprint author), EUROPEAN SPACE TECHNOL CTR,EUROPEAN SPACE AGCY,DEPT SPACE SCI,2200 AG NOORDWIJK,NETHERLANDS. NR 26 TC 20 Z9 20 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1995 VL 100 IS A9 BP 17143 EP 17151 DI 10.1029/95JA00897 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT743 UT WOS:A1995RT74300018 ER PT J AU KAYMAZ, Z SISCOE, G LUHMANN, JG FEDDER, JA LYON, JG AF KAYMAZ, Z SISCOE, G LUHMANN, JG FEDDER, JA LYON, JG TI INTERPLANETARY MAGNETIC-FIELD CONTROL OF MAGNETOTAIL FIELD - IMP-8 DATA AND MHD MODEL COMPARED SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article AB Magnetic field patterns in the magnetotail's cross-sectional plane at similar to 30 R(E) derived from IMP 8 data are compared with corresponding patterns derived from the Fedder-Lyon MHD model of magnetosphere - solar wind interaction. The comparisons emphasize features attributable to the influence of the interplanetary magnetic field (IMF). They reveal considerable correspondences in field asymmetries, nonuniform field perturbations, and current sheet twisting. Both data-based and MHD-based patterns are qualitatively similar to patterns obtained by superposing a uniform field on a dipole field, but they show that the field perturbations are stronger at the equatorial flanks of the tail than in the high-latitude lobes. These quantitative details go beyond the superposition model. From the point of view of interpretation, the fact that the MHD-based patterns reproduce the distinctive nonsuperposition features seen in the data-based patterns indicates that these features result from MHD motions within the magnetosphere distributing the field that is merged at the magnetopause (i.e., the ''penetrating'' field), From the point of view of modeling, the agreement indicates that MHD modeling captures essential aspects of the solar wind - magnetosphere coupling. C1 UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. DARTMOUTH COLL,DEPT PHYS & ASTRON,HANOVER,NH 03755. USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD 20785. RP KAYMAZ, Z (reprint author), BOSTON UNIV,G SISCOE CTR SPACE PHYS,BOSTON,MA 02215, USA. NR 10 TC 26 Z9 26 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1995 VL 100 IS A9 BP 17163 EP 17172 DI 10.1029/95JA00593 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT743 UT WOS:A1995RT74300020 ER PT J AU BERNHARDT, PA SIEFRING, CL RODRIQUEZ, P HAAS, DG BAUMBACK, MM ROMERO, HA SOLIN, DA DJUTH, FT DUNCAN, LM HUNTON, DE POLLOCK, CJ SULZER, MP TEPLEY, CA WAGNER, LS GOLDSTEIN, JA AF BERNHARDT, PA SIEFRING, CL RODRIQUEZ, P HAAS, DG BAUMBACK, MM ROMERO, HA SOLIN, DA DJUTH, FT DUNCAN, LM HUNTON, DE POLLOCK, CJ SULZER, MP TEPLEY, CA WAGNER, LS GOLDSTEIN, JA TI THE IONOSPHERIC FOCUSED HEATING EXPERIMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID POWER RADIO-WAVES; ARTIFICIAL AIRGLOW; FREQUENCY; ARECIBO AB The Ionospheric Focused Heating rocket was launched on May 30, 1992. The sounding rocket carried an instrument and chemical payload along a trajectory that crossed the intersection of the beams from the 430-MHz incoherent scatter radar and the 5.1-MHz high-power radio wave facility near Arecibo. The release of 30 kg of CF3Br into the F region at 285 km altitude produced an ionospheric hole that acted like a convergent lens to focus the HF transmissions. The power density inside the radio beam was raised by 12 dB immediately after the release. A wide range of new processes were recorded by in situ and ground-based instruments. Measurements by instruments flying through the modified ionosphere show small-scale microcavities (<1 m) and downshifted electron plasma (Langmuir) waves inside the artificial cavity, electron density spikes at the edge of the cavity, and Langmuir waves coincident with ion gyroradius (4 m) cavities near the radio wave reflection altitude. The Arecibo incoherent scatter radar showed 20 dB or greater enhancements in ion acoustic and Langmuir wave turbulence after the 5.1-MHz radio beam was focused by the artificial lens. Enhancements in airglow from chemical reactions and, possibly, electron acceleration were recorded with optical instruments. The Ionospheric Focused Heating experiment verified some of the preflight predictions and demonstrated the value of active experiments that combine high-power radio waves with chemical releases. C1 GEOSPACE RES INC,EL SEGUNDO,CA. UNIV TULSA,SCH ENGN & APPL SCI,TULSA,OK 74104. GPID,PHILLIPS LAB,BEDFORD,MA. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NATL ASTRON & IONOSPHERE CTR,ARECIBO OBSERV,ARECIBO,PR 00613. USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,CODE 6794,4555 OVERLOOK RD,WASHINGTON,DC 20375, USA. NR 29 TC 22 Z9 22 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1995 VL 100 IS A9 BP 17331 EP 17345 DI 10.1029/94JA01887 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RT743 UT WOS:A1995RT74300036 ER PT J AU SERAKOS, D LIN, CF AF SERAKOS, D LIN, CF TI LINEARIZED KAPPA-GUIDANCE SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article AB An alternative solution to the kappa-guidance dynamic equations is presented in this paper The kappa-guidance is a midcourse guidance algorithm that maximizes intercept velocity. The nonlinear kappa-guidance dynamic equations are linearized. The linearization is via a nonlinear coordinate transformation and nonlinear feedback. The cost function is approximated by a quadratic cost. The linear quadratic regulator (LQR) method is then used to solve the optimal control problem. A closed-form solution to the LQR problem is derived for both the free and fixed final angle of approach cases. A closed-form solution has not been derived for the original solution. A simulation is conducted to compare the trajectories and costs of the linearized solution versus the original solution. The results show similar performance between the two methods. C1 AMER GNC CORP,CHATSWORTH,CA 91311. RP SERAKOS, D (reprint author), USN,CTR SURFACE WARFARE,DEPT COMBAT SYST,DAHLGREN,VA 22448, USA. NR 4 TC 6 Z9 7 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD SEP-OCT PY 1995 VL 18 IS 5 BP 975 EP 980 DI 10.2514/3.21493 PG 6 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA RZ381 UT WOS:A1995RZ38100006 ER PT J AU SINGH, SN STEINBERG, M DIGIROLAMO, RD AF SINGH, SN STEINBERG, M DIGIROLAMO, RD TI NONLINEAR PREDICTIVE CONTROL OF FEEDBACK LINEARIZABLE SYSTEMS AND FLIGHT CONTROL-SYSTEM DESIGN SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article ID INVERSION; DYNAMICS; AIRCRAFT AB The question of output trajectory control of input-output feedback linearizable nonlinear dynamic systems using state variable feedback is considered, For the derivation of the predictive control law, a vector function s is chosen as a linear combination of the tracking error, its higher order derivatives, and the integral of the tracking error, The control law is obtained by the minimization of a quadratic function of the predicted value of s and the control input. It is shown that in the closed loop system the trajectories are uniformly ultimately bounded in the presence of uncertainty in the system parameters. Based on these results, a light control system for the trajectory control of the output variables pitch, sideslip, and roll angles (theta, beta, phi) using aileron, rudder, and elevator control is presented. Simulation results are obtained to show that precise simultaneous longitudinal and lateral maneuvers can be performed in spite of the uncertainty in the aerodynamic parameters. C1 USN,CTR AIR DEV,DIV AIRCRAFT,WARMINSTER,PA 18974. RP SINGH, SN (reprint author), UNIV NEVADA,DEPT ELECT & COMP ENGN,LAS VEGAS,NV 89154, USA. NR 18 TC 27 Z9 30 U1 0 U2 3 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD SEP-OCT PY 1995 VL 18 IS 5 BP 1023 EP 1028 DI 10.2514/3.21500 PG 6 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA RZ381 UT WOS:A1995RZ38100013 ER PT J AU HECKER, M AF HECKER, M TI EXPERT-SYSTEM FOR PROCESSING UNCORRELATED SATELLITE TRACKS SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article AB Through an array of ground-based radar sites and optical cameras, the United States military tracks objects in near and far Earth orbit. The sensors provide epoch and ephemeris information that is used to update a database of known objects. Although the majority of the sensor observations are matched to their corresponding satellites, a small percentage are beyond the capabilities of current association software and can not be correlated. These uncorrelated targets must be manually fitted by orbital analysts in a labor intensive process. As an alternative to this human intervention, the use of artificial intelligence techniques to augment the present computer code was explored. Specifically, an expert system, a potential replacement for an orbital analyst, was developed for processing uncorrelated targets. An evaluation function was used in conjunction with a rule-based system to capture the orbital analysts' expertise. The initial results are very good with the tested portions of the system matching the performance of the experts with an accuracy of 99%. Although not yet complete, the code developed in this research illustrates the potential of using artificial intelligence to process uncorrelated targets. RP HECKER, M (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD SEP-OCT PY 1995 VL 18 IS 5 BP 1139 EP 1144 DI 10.2514/3.21516 PG 6 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA RZ381 UT WOS:A1995RZ38100029 ER PT J AU QUINN, TC JABS, DA HOLBROOK, JT HARDY, WD POLSKY, B LEWIS, RA CLOGSTON, P FAINSTEIN, V GROSS, R SAMO, T TUTTLE, C APUZZO, L BARTLETT, J DUNN, JP ELDRED, L FEINBERG, J FLYNN, T KING, R BARRON, B GREENSPAN, D LECOUNT, C PEYMAN, G FRANKLIN, R HEINEMANN, M SQUIRES, K WISECAMPBELL, S FRIEDMAN, AH CHEUNG, TW JUSTIN, N TEICH, SA SACKS, H SEVERIN, C FRIEDBERG, DN ADDESSI, A DIETERICH, D LAFLEUR, F WEINBERG, D JAMPOL, L MURPHY, R NAUGHTON, K HENDERLY, D HOLLAND, GN CHAFEY, S FALL, H KIMBRELL, C MACARTHUR, LJ FREEMAN, WR MEIXNERT, L PETERSON, TJ QUICENO, JI RICKMAN, L SIMANELLO, MA SPECTOR, S ODONNELL, J HOFFMAN, J IRVINE, A JACOBSON, M LARSON, J SEIFF, S WARNER, L DAVIS, J CHUANG, E ESPINAL, M MENDEZ, P CHEESEMAN, SH GITTINGER, J HAUBRICH, R KACHADOORIAN, H TOLSON, K BROWNBELLAMY, J KLEMM, AC MARKOWITZ, JA MEINERT, CL AMENDLIBERCCI, A COLESON, L COLLINS, KL COLLISON, BJ DODGE, J DONITHAN, M EWING, C FINK, N GERCZAK, C ISAACSON, MR KAPLANGILIPIN, A HUFFMAN, R LEVINE, CR NOWAKOWSKI, DJ SMITH, M TONASCIA, J VANNATTA, ML AGRESSEGAL, M ARMSTRONG, J BROTHERS, R HUBBARD, L HURLBURT, D MAGLI, Y MINER, K THOMAS, S VANDERHOOFYOUNG, M STEWART, G HUGHES, R LEEF, J PALMER, S MOWERY, R ELLENBERG, S KORVICK, J DAVIS, MD CLARK, T MERIN, L SATTLER, F JORDAN, C MILLS, J BROWN, BW CONWAY, B GRIZZLE, J NUSSENBLATT, R PHAIR, J SMITH, H KLINE, R MOSS, M CARELLA, A AF QUINN, TC JABS, DA HOLBROOK, JT HARDY, WD POLSKY, B LEWIS, RA CLOGSTON, P FAINSTEIN, V GROSS, R SAMO, T TUTTLE, C APUZZO, L BARTLETT, J DUNN, JP ELDRED, L FEINBERG, J FLYNN, T KING, R BARRON, B GREENSPAN, D LECOUNT, C PEYMAN, G FRANKLIN, R HEINEMANN, M SQUIRES, K WISECAMPBELL, S FRIEDMAN, AH CHEUNG, TW JUSTIN, N TEICH, SA SACKS, H SEVERIN, C FRIEDBERG, DN ADDESSI, A DIETERICH, D LAFLEUR, F WEINBERG, D JAMPOL, L MURPHY, R NAUGHTON, K HENDERLY, D HOLLAND, GN CHAFEY, S FALL, H KIMBRELL, C MACARTHUR, LJ FREEMAN, WR MEIXNERT, L PETERSON, TJ QUICENO, JI RICKMAN, L SIMANELLO, MA SPECTOR, S ODONNELL, J HOFFMAN, J IRVINE, A JACOBSON, M LARSON, J SEIFF, S WARNER, L DAVIS, J CHUANG, E ESPINAL, M MENDEZ, P CHEESEMAN, SH GITTINGER, J HAUBRICH, R KACHADOORIAN, H TOLSON, K BROWNBELLAMY, J KLEMM, AC MARKOWITZ, JA MEINERT, CL AMENDLIBERCCI, A COLESON, L COLLINS, KL COLLISON, BJ DODGE, J DONITHAN, M EWING, C FINK, N GERCZAK, C ISAACSON, MR KAPLANGILIPIN, A HUFFMAN, R LEVINE, CR NOWAKOWSKI, DJ SMITH, M TONASCIA, J VANNATTA, ML AGRESSEGAL, M ARMSTRONG, J BROTHERS, R HUBBARD, L HURLBURT, D MAGLI, Y MINER, K THOMAS, S VANDERHOOFYOUNG, M STEWART, G HUGHES, R LEEF, J PALMER, S MOWERY, R ELLENBERG, S KORVICK, J DAVIS, MD CLARK, T MERIN, L SATTLER, F JORDAN, C MILLS, J BROWN, BW CONWAY, B GRIZZLE, J NUSSENBLATT, R PHAIR, J SMITH, H KLINE, R MOSS, M CARELLA, A TI ANTIVIRAL EFFECTS OF FOSCARNET AND GANCICLOVIR THERAPY ON HUMAN-IMMUNODEFICIENCY-VIRUS P24 ANTIGEN IN PATIENTS WITH AIDS AND CYTOMEGALOVIRUS RETINITIS SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID IMMUNE-DEFICIENCY-SYNDROME; REPLICATION INVITRO; ACID DISSOCIATION; PHOSPHONOFORMATE FOSCARNET; CONTROLLED TRIAL; ZIDOVUDINE; INFECTION; DISEASE; TYPE-1; HIV AB To examine whether the prolonged survival seen in patients treated with foscarnet compared with those treated with ganciclovir was due to a direct effect on human immunodeficiency virus (HIV) replication, HIV p24 antigen was measured. Of 71 receiving foscarnet, 54% were p24 antigen-positive at enrollment (vs. 44% of 79 receiving ganciclovir). By immune complex-dissociated (ICD) p24 antigen analysis, 87% and 78%, respectively, were positive. After 1 month of treatment, there was a significant decline in standard (mean decline, 10.1 pg/mL) and ICD (mean, 39.6 pg/mL) p24 antigen in both groups (P = .0001). Mortality was greater in those who were ICD p24 antigen-positive than in those -negative at baseline (P = .03) and in subjects with an increase in ICD p24 antigen than in those with a decline (P = .09). Thus, each drug had a suppressive effect on circulating p24 antigen, which was predictive of improved survival. The inhibitory effect on CMV replication may have a beneficial effect on limiting HIV replication. C1 NIAID,BALTIMORE,MD 21205. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. CORNELL MED CTR,NEW YORK,NY. BAYLOR COLL MED,CULLEN EYE INST,HOUSTON,TX 77030. LOUISIANA STATE UNIV,MED CTR,NEW ORLEANS,LA. CORNELL UNIV,NEW YORK HOSP,MED CTR,NEW YORK,NY 10021. MEM SLOAN KETTERING CANC CTR,NEW YORK,NY 10021. MT SINAI SCH MED,NEW YORK,NY. NYU,MED CTR,NEW YORK,NY. NORTHWESTERN UNIV,CHICAGO,IL. UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92103. USN HOSP,BETHESDA,MD 20814. UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. UNIV MIAMI,SCH MED,MIAMI,FL. UNIV MASSACHUSETTS,MED CTR,WORCESTER,MA. JOHNS HOPKINS UNIV,CTR COORDINATOR,SCH HYG & PUBL HLTH,BALTIMORE,MD 21218. UNIV WISCONSIN,FUNDUS PHOTOGRAPH READING CTR,MADISON,WI. ERC BIOSERV CORP,CTR DRUG DISTRIBUT,ROCKVILLE,MD. BIOMED RES INST,SERUM & CMV CULTURE REPOSITORY,ROCKVILLE,MD 20852. NEI,BETHESDA,MD. NIAID,BETHESDA,MD. RP QUINN, TC (reprint author), JOHNS HOPKINS UNIV,SCH MED,550 BLDG,SUITE 700,BALTIMORE,MD 21205, USA. NR 53 TC 12 Z9 12 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD SEP PY 1995 VL 172 IS 3 BP 613 EP 621 PG 9 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA RR073 UT WOS:A1995RR07300001 ER PT J AU PEELER, DP AF PEELER, DP TI ALMOST CHOSEN PEOPLE - OBLIQUE BIOGRAPHIES IN THE AMERICAN GRAIN - ZUCKERMAN,M SO JOURNAL OF INTERDISCIPLINARY HISTORY LA English DT Book Review RP PEELER, DP (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD ST JOURNALS DEPT, CAMBRIDGE, MA 02142 SN 0022-1953 J9 J INTERDISCIPL HIST JI J. Interdiscip. Hist. PD FAL PY 1995 VL 26 IS 2 BP 335 EP 337 DI 10.2307/206656 PG 3 WC History SC History GA RQ847 UT WOS:A1995RQ84700055 ER PT J AU WAX, JR SMITH, JF FLOYD, RC AF WAX, JR SMITH, JF FLOYD, RC TI ELEVATED MATERNAL SERUM AND AMNIOTIC-FLUID ALPHA-FETOPROTEIN ASSOCIATED WITH IN-UTERO CYTOMEGALOVIRUS-INFECTION SO JOURNAL OF MATERNAL-FETAL INVESTIGATION LA English DT Article DE PRENATAL DIAGNOSIS; ALPHA-FETOPROTEIN; CONGENITAL INFECTION ID PRENATAL-DIAGNOSIS AB Objective: We report a unique case of congenital cytomegalovirus infection characterized by both elevated maternal serum and amniotic fluid a-fetoprotein (MSAFP and AFAFP). Methods/Results: Amniotic fluid culture and fetal blood analysis diagnosed cytomegalovirus infection in a hydropic and growth-impaired 22-week fetus. The MSAFP was 4.37 MOM, and the AFAFP was 6.72 MOM. AF acetylcholinesterase and fetal hemoglobin were absent. No congenital anomalies were present. A neonatal urine culture positive for cytomegalovirus confirmed the prenatal diagnosis. Conclusion: In utero cytomegalovirus infection should be considered in the differential diagnosis of elevated MSAFP, especially if the AFAFP is also inexplicably elevated. MSAFP and AFAFP levels may be reasonable to study for determining the prognosis for cases of in utero cytomegalovirus infection. RP WAX, JR (reprint author), USN,MED CTR,DEPT GYNECOL & OBSTET,DIV MATERNAL FETAL MED,PORTSMOUTH,VA 23708, USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0939-6322 J9 J MATERN-FETAL INVES JI J. Matern.-Fetal Invest. PD FAL PY 1995 VL 5 IS 4 BP 266 EP 267 PG 2 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA TH986 UT WOS:A1995TH98600012 ER PT J AU DOWNEY, EC MAHER, DP THOMPSON, WR AF DOWNEY, EC MAHER, DP THOMPSON, WR TI DIAGNOSTIC PNEUMOPERITONEUM ACCURATELY PREDICTS THE PRESENCE OF PATENT PROCESSUS-VAGINALIS SO JOURNAL OF PEDIATRIC SURGERY LA English DT Article DE INGUINAL HERNIA; ARTIFICIAL PNEUMOPERITONEUM; DIAGNOSIS; PROCESSUS VAGINALIS ID INGUINAL-HERNIA AB Ninety-four infants with unilateral indirect inguinal hernia underwent repair and diagnostic pneumoperitoneum (DPP). Contralateral groin exploration was performed in all patients including those with a negative DPP result. Thirty-seven (39%) of the 94 patients had a positive DPP result, and 36 of 37 (97%) had a patent processus vaginalis (PPV) on the side contralateral to the clinical hernia. Fifty-seven (61%) of the 94 patients had a negative DPP result, and 54 (95%) of these had no PPV, Female patients had a 1:1 correlation between DPP and PPV, DPP can predict the presence of PPV in the contralateral groin of patients with unilateral hernia with precision and minimizes the need for diagnostic groin exploration. Copyright (C) 1995 by W.B. Saunders Company. C1 KAISER PERMANENTE MED CTR,DEPT SURG,SAN DIEGO,CA. USN HOSP,DEPT SURG,SAN DIEGO,CA 92134. NR 11 TC 5 Z9 5 U1 0 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0022-3468 J9 J PEDIATR SURG JI J. Pediatr. Surg. PD SEP PY 1995 VL 30 IS 9 BP 1271 EP 1272 DI 10.1016/0022-3468(95)90483-2 PG 2 WC Pediatrics; Surgery SC Pediatrics; Surgery GA RV171 UT WOS:A1995RV17100007 PM 8523223 ER PT J AU QUARTARARO, AT AF QUARTARARO, AT TI THE PERILS OF ASSIMILATION IN MODERN FRANCE - THE DEAF COMMUNITY, SOCIAL-STATUS, AND EDUCATIONAL-OPPORTUNITY, 1815-1870 SO JOURNAL OF SOCIAL HISTORY LA English DT Article AB This article discusses the social status of deaf people and their educational opportunity in France between 1815 and 1870. The author first considers the role of the Deaf Institute in Paris as a state-sponsored institution serving both social welfare and educational purposes. The national government tried to relieve the economic burden of poor parents with deaf children by offering a number of full scholarships to qualified families. The author next discusses the work of Louis-Pierre Paulmier and Roch-Ambroise Bebian who advocated the use of French sign language in schools for the deaf during the early nineteenth century. Both Paulmier and Bebian believed that sign language coupled with written French would be the most beneficial way to instruct deaf children. The author also investigates some proposed educational reforms during the Second Empire which would have ''mainstreamed'' deaf children into public primary schools. Although these so-called reforms were never implemented in the 1860s, leaders in the deaf community, such as Ferdinand Berthier, were ignored as government officials pressed ahead with the hearing model of ''articulated speech'' as the new government policy for deaf school in France after 1880. RP QUARTARARO, AT (reprint author), USN ACAD,DEPT HIST,ANNAPOLIS,MD 21402, USA. NR 40 TC 2 Z9 2 U1 0 U2 0 PU CARNEGIE MELLON UNIV PRESS PI PITTSBURGH PA CARNEGIE MELLON UNIV J SOCIAL HIST, PITTSBURGH, PA 15213 SN 0022-4529 J9 J SOC HIST JI J. Soc. Hist. PD FAL PY 1995 VL 29 IS 1 BP 5 EP & PG 0 WC History SC History GA RU441 UT WOS:A1995RU44100001 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI MODEL-BASED ENVIRONMENTAL INVERSION - A SHALLOW-WATER OCEAN APPLICATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOURCE LOCALIZATION; VERTICAL ARRAY AB A model-based approach to invert or estimate the sound-speed profile (SSP) from noisy pressure-field measurements or more succinctly a solution to the model-based inversion problem is discussed. Recall that model-based signal processing is a well-defined methodology enabling the inclusion of environmental (propagation) models, measurement (sensor arrays) models and noise (shipping, measurement) models into sophisticated processing algorithms. Here the design of a model-based processor (MBP) is investigated based on a Taylor series expansion of the SSP about the most current set of parameter estimates augmented into the state-space representation of a normal-mode propagation model to solve the environmental inversion problem. The resulting processor is adaptive in terms of simultaneously estimating the sound speed, modes, and pressure field at each iteration. Using data obtained from from the well-known Hudson Canyon experiment, a noisy shallow water ocean environment, the processor is designed and the results compared to those predicted using various propagation models and data. It is shown that the on-line, MBP not only predicts the sound speed quite well, but also is able to simultaneously provide enhanced estimates of both modal and pressure-held measurements which are useful for localization and rapid ocean environmental characterization. (C) 1995 Acoustical Society of America. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-495,LIVERMORE,CA 94550, USA. NR 23 TC 9 Z9 13 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1446 EP 1454 DI 10.1121/1.413411 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500017 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI PASSIVE LOCALIZATION IN OCEAN ACOUSTICS - A MODEL-BASED APPROACH SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SHALLOW-WATER; DEPTH ESTIMATION; VERTICAL ARRAY; TOWED ARRAY; INFORMATION; FILTER; RANGE AB A model-based approach is developed to solve the passive localization problem in ocean acoustics using the state-space formulation for the first time. It is shown that the inherent structure of the resulting processor consists of a parameter estimator coupled to a nonlinear optimization scheme. The parameter estimator is designed using the model-based approach in which an ocean acoustic propagation model is used in developing the model-based processor required for localization. Recall that model-based signal processing is a well-defined methodology enabling the inclusion of environmental (propagation) models, measurement (sensor arrays) models, and noise (shipping, measurement) models into a sophisticated processing algorithm. Here the parameter estimator is designed, or more appropriately the model-based identifier (MBID) for a propagation model developed from a shallow water ocean experiment. After simulation, it is then applied to a set of experimental data demonstrating the applicability of this approach. (C) 1995 Acoustical Society of America. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-495,LIVERMORE,CA 94550, USA. NR 47 TC 22 Z9 24 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1455 EP 1471 DI 10.1121/1.413412 PG 17 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500018 ER PT J AU LAGAKOS, N BUCARO, JA EHRENFEUCHTER, PE HOUSTON, BH AF LAGAKOS, N BUCARO, JA EHRENFEUCHTER, PE HOUSTON, BH TI FIBER-EMBEDDED MANDREL-STIFFENED PLANAR ACOUSTIC SENSOR SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID FREQUENCY AB A plastic mandrel-based, embedded planar fiber-optic acoustic sensor has been developed by wrapping a single mode fiber around solid plastic mandrels which are embedded in an elastomeric encapsulant forming a planar device. The acoustic sensitivity of the sensor was found to be high and frequency independent. The high sensitivity is a result of the effective utilization of the low bulk modulus encapsulant (elastomer), while the frequency-independent sensitivity is a result of the low acceleration sensitivity of the sensor due to the out-of-plane fiber coil geometry and the presence of the mandrels. A comparison is made between this sensor and other large area fiber-optic sensor designs. (C) 1995 Acoustical Society of America. RP LAGAKOS, N (reprint author), USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1618 EP 1622 DI 10.1121/1.413427 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500034 ER PT J AU KORDOMENOS, J ATCHLEY, AA RASPET, R BASS, HE AF KORDOMENOS, J ATCHLEY, AA RASPET, R BASS, HE TI EXPERIMENTAL-STUDY OF A THERMOACOUSTIC TERMINATION OF A TRAVELING-WAVE TUBE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Much of the recent experimental work in thermoacoustics has concentrated on standing wave systems. A recent analysis of traveling-wave thermoacoustics [J. Acoust. Soc. Am. 94, 2232-2239 (1993)] prompted an experimental study. The measurements presented herein confirm theoretical predictions that the work done on a traveling wave is thermoacoustic in nature and not due to a Stirling cycle. Experimental response curves are given for two different terminations and compared to theory. The thermoacoustic effect provides a modest change in the reflected and transmitted amplitudes. (C) 1995 Acoustical Society of America. C1 USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. RP KORDOMENOS, J (reprint author), UNIV MISSISSIPPI,DEPT PHYS & ASTRON,PHYS ACOUST RES GRP,UNIVERSITY,MS 38677, USA. NR 5 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1623 EP 1628 DI 10.1121/1.413428 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500035 ER PT J AU COLLINS, MD FISHMAN, L AF COLLINS, MD FISHMAN, L TI EFFICIENT NAVIGATION OF PARAMETER LANDSCAPES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID OPTIMIZATION; TEMPERATURE; INVERSION; OCEAN AB Optimization techniques can have difficulty navigating long valleys that are oriented obliquely to the parameter axes. Efficiency may be improved by rotating coordinates so that the most prominent valleys are optimally aligned with the parameter axes. The rotated axes are parallel to the eigenvectors of the covariance matrix of the gradient of the cost function, which may be estimated efficiently by Monte Carlo integration. The information in the covariance matrix may also be used to obtain an improved parametrization, which corresponds to the rotated coordinates associated with the largest eigenvalues. The approach is illustrated for the inverse problem of estimating ocean bottom parameters from acoustic data using simulated annealing. For multifrequency inverse problems, the resolution for each frequency is optimized. (C) 1995 Acoustical Society of America. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 56 Z9 56 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1637 EP 1644 DI 10.1121/1.413430 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500037 ER PT J AU COLLINS, MD KUPERMAN, WA SIEGMANN, WL AF COLLINS, MD KUPERMAN, WA SIEGMANN, WL TI A PARABOLIC EQUATION FOR PORE-ELASTIC MEDIA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WAVE-PROPAGATION; ACOUSTIC PROPAGATION; OCEAN; BOTTOM; REFLECTION; APPROXIMATION; INTERFACE; DEPTH AB The parabolic equation (PE) method is extended to handle problems involving pore-elastic layers [M. A. Blot, ''Theory of propagation of elastic waves in a fluid-saturated porous solid,'' J. Acoust. Sec. Am. 28, 168-191 (1956)]. The equations of motion are derived for heterogeneous pore-elastic media. Interface conditions that are appropriate for the PE method are derived for coupling to fluid and elastic layers. For the two-dimensional geometry (range and depth) that is representative of many problems in ocean acoustics, the equations of motion reduce to three coupled equations that factor into outgoing and incoming wave equations (the standard formulation has a redundant equation). The outgoing wave equation is solved with the PE method using rational approximations. The pore-elastic PE, which is a generalization of the elastic PE, is an efficient approach for solving range-dependent propagation problems involving an ocean overlying a pore-elastic sediment. The self-starter is generalized to handle compressional and shear sources in pore-elastic layers. The coefficients of the pore-elastic wave equation are derived from a set of natural parameters. (C) 1995 Acoustical Society of America. C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. RENSSELAER POLYTECH INST,TROY,NY 12180. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 38 TC 25 Z9 25 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1995 VL 98 IS 3 BP 1645 EP 1656 DI 10.1121/1.413431 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA RT915 UT WOS:A1995RT91500038 ER PT J AU MITRA, S DUTTA, G DUTTA, I AF MITRA, S DUTTA, G DUTTA, I TI EFFECT OF HEAT-TREATMENT ON THE MICROSTRUCTURE AND PROPERTIES OF DENSE ALN SINTERED WITH Y2O3 ADDITIONS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID HIGH-THERMAL-CONDUCTIVITY; ALUMINUM NITRIDE; AIN CERAMICS; CRYSTALS; SAMPLE AB The secondary phase constitution in two sintered AIN ceramics (1.8% and 4.2% Y2O3 additions) was studied as a function of heat treatment temperatures between 1750 degrees and 1900 degrees C under pure nitrogen atmosphere. The effect of the phase constitution on the physical properties, such as density, thermal conductivity (K), and lattice constants, and on the mechanical properties in three-point bending, was also investigated. Y3Al2O12 was found to getter dissolved oxygen from the AlN lattice below 1859 degrees C, but evaporated at 1850 degrees C and above. Y4Al2O9 appeared to sublimate below 1850 degrees C in the atmosphere used in this study. Depending on the secondary phase constitution, heat treatment affected thermal conductivity favorably or adversely. Occasionally, samples with similar lattice oxygen contents were found to have different thermal conductivities, suggesting that factors besides dissolved oxygen can also influence K. Lattice parameter measurements indicated that, within the small range of lattice oxygen concentrations in the AIN samples studied, the c-axis was more sensitive than the a axis to oxygen content. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. NR 35 TC 15 Z9 15 U1 0 U2 1 PU AMER CERAMIC SOC 735 CERAMIC PLACE PI WESTERVILLE PA PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD SEP PY 1995 VL 78 IS 9 BP 2335 EP 2344 DI 10.1111/j.1151-2916.1995.tb08666.x PG 10 WC Materials Science, Ceramics SC Materials Science GA TJ790 UT WOS:A1995TJ79000007 ER PT J AU MICHEL, D COSBY, R AF MICHEL, D COSBY, R TI DIABETES-INSIPIDUS OF PREGNANCY IS SUGGESTED BY NORMAL SERUM SODIUM SO JOURNAL OF THE AMERICAN SOCIETY OF NEPHROLOGY LA English DT Meeting Abstract C1 USN,MED CTR,DEPT INTERNAL MED,SAN DIEGO,CA 92152. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1046-6673 J9 J AM SOC NEPHROL JI J. Am. Soc. Nephrol. PD SEP PY 1995 VL 6 IS 3 SI SI BP 442 EP 442 PG 1 WC Urology & Nephrology SC Urology & Nephrology GA RX686 UT WOS:A1995RX68600557 ER PT J AU Skolnik, M AF Skolnik, M TI The radar antenna - Circa 1995 SO JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS LA English DT Article; Proceedings Paper CT 13th Annual Benjamin Franklin Symposium CY MAY 05, 1995 CL FRANKLIN INST, PHILADELPHIA, PA SP IEEE, Philadelphia Sect, Franklin Inst HO FRANKLIN INST ID DIPOLE; PULSE AB This paper reviews some of the current interests in radar antennas, including work conducted at the U. S. Naval Research Laboratory. Almost all types of antennas have been wed in radar, but it is the phased array which has received the most attention in recent years, especially for military applications. Methods for making phased arrays more affordable are discussed, as well as the potential of ferroelectric phased arrays, diode lens arrays (Radant antenna), agile plasma mirror, phased arrays employing fiber optics, and antennas for ultrawideband radar. Also briefly mentioned are several areas where further radar antenna development might be indicated. RP Skolnik, M (reprint author), USN,RES LAB,DIV RADAR,CODE 5300,WASHINGTON,DC 20375, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-0032 J9 J FRANKLIN I JI J. Frankl. Inst.-Eng. Appl. Math. PD SEP PY 1995 VL 332B IS 5 BP 503 EP 519 DI 10.1016/0016-0032(95)00078-X PG 17 WC Automation & Control Systems; Engineering, Multidisciplinary; Engineering, Electrical & Electronic; Mathematics, Interdisciplinary Applications SC Automation & Control Systems; Engineering; Mathematics GA UH873 UT WOS:A1995UH87300002 ER PT J AU BERNHARDT, PA AF BERNHARDT, PA TI DIRECT RECONSTRUCTION METHODS FOR HYPERSPECTRAL IMAGING WITH ROTATIONAL SPECTROTOMOGRAPHY SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID SIMULTANEOUS ACQUISITION; FLUORESCENCE; ALGORITHMS; TOMOGRAPHY; SYSTEM AB A new technique for hyperspectral imaging called spectrotomography collects all available photons and relies on computer tomography to reconstruct the three-dimensional data cube of an object. A rotational spectrotomographic (RST) imager is designed with a wide-aperture, objective-grating camera that is rotated in steps around its optical axis. The full range of spatial and spectral resolution is achieved by the use of a stepped-focal-length (zoom) lens to illuminate the grating. Two-dimensional projections of the object are analyzed with the use of both direct Fourier methods and filter-backprojection algorithms. The RST imager has applications to detection of optical emissions where large photon throughput is required. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 28 TC 22 Z9 22 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD SEP PY 1995 VL 12 IS 9 BP 1884 EP 1901 DI 10.1364/JOSAA.12.001884 PG 18 WC Optics SC Optics GA RR754 UT WOS:A1995RR75400007 ER PT J AU ZEISSE, CR AF ZEISSE, CR TI RADIANCE OF THE OCEAN HORIZON SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article AB Cox and Munk used aerial photographs of Sun glint to determine the statistical distribution of ocean capillary wave slopes as a function of wind velocity [J. Opt. Sec. Am. 44, 838 (1954)]. When their equation connecting the slope distribution with Sun glint is used on the horizon, however, an infinite glint is predicted even though Sun glint never exceeds solar radiance. An integral equation connecting the capillary wave slope distribution with ocean radiance is derived. The integral predicts a finite Sun glint on the ocean horizon and, away from the horizon. reduces to the algebraic form used by Cox and Munk. RP ZEISSE, CR (reprint author), USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV OCEANOG & ATMOSPHER SCI,SAN DIEGO,CA 92152, USA. NR 11 TC 28 Z9 30 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD SEP PY 1995 VL 12 IS 9 BP 2022 EP 2030 DI 10.1364/JOSAA.12.002022 PG 9 WC Optics SC Optics GA RR754 UT WOS:A1995RR75400021 ER PT J AU SCOTT, AM WHITNEY, WT AF SCOTT, AM WHITNEY, WT TI CHARACTERISTICS OF A BRILLOUIN RING-RESONATOR USED FOR PHASE-CONJUGATION AT 2.1 MU-M SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID STIMULATED SCATTERING AB We have investigated the use of stimulated Brillouin scattering (SBS) in a ring resonator to reduce the threshold of SBS phase conjugation for radiation from a frequency-narrowed Cr, Tm, Ho:YAG laser operating at 2.12 mu m. Compared with an alternative scheme for threshold reduction, the loop scheme, we find that the ring resonator has a lower SBS threshold and a similar fidelity, but exhibits large fluctuations in output. We attribute these to fluctuations in the cavity length that detune the mode frequency from the center of the Brillouin gain bandwidth. Mode beating is occasionally observed with the beat frequency's being strongly influenced by the effect of a Brillouin-induced phase shift. C1 USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375. NR 18 TC 8 Z9 9 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD SEP PY 1995 VL 12 IS 9 BP 1634 EP 1641 DI 10.1364/JOSAB.12.001634 PG 8 WC Optics SC Optics GA RU396 UT WOS:A1995RU39600014 ER PT J AU ESAREY, E SPRANGLE, P PILLOFF, M KRALL, J AF ESAREY, E SPRANGLE, P PILLOFF, M KRALL, J TI THEORY AND GROUP-VELOCITY OF ULTRASHORT, TIGHTLY FOCUSED LASER-PULSES SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID FEMTOSECOND PULSES; ACCELERATION; PROPAGATION; PLASMAS AB The wave equation describing an ultrashort, tightly focused laser pulse in vacuum is solved analytically. Plasma dispersive effects are also included. Based on exact short-pulse solutions, analytical expressions are obtained for the pulse-length evolution, the pulse centroid motion, and the group velocity. Approximate short-pulse solutions are obtained to arbitrary order in the parameter lambda/2 pi L < 1, where lambda is the pulse wavelength and L is the length of the pulse envelope. Comparisons are made to the solutions of the paraxial wave equation and to numerical solutions of the full wave equation. The exact analytical expression for the pulse group velocity upsilon(g), which is correctly determined from the motion of the pulse centroid, is in excellent agreement with the numerical solution. In vacuum, 1 - upsilon(g)/c congruent to (lambda/2 pi r(0))(2), where r(0) is the laser spot size at focus. Estimates for the quantity 1 - upsilon(g)/c, based on the paraxial wave equation, are found to be in error by a factor of 2. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 24 TC 57 Z9 57 U1 2 U2 10 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD SEP PY 1995 VL 12 IS 9 BP 1695 EP 1703 DI 10.1364/JOSAB.12.001695 PG 9 WC Optics SC Optics GA RU396 UT WOS:A1995RU39600022 ER PT J AU CAPLAN, ES PREAS, MA KERNS, T SODERSTROM, C BOSSE, M BANSAL, J CONSTANTINE, NT HENDRIX, E CAPLAN, M AF CAPLAN, ES PREAS, MA KERNS, T SODERSTROM, C BOSSE, M BANSAL, J CONSTANTINE, NT HENDRIX, E CAPLAN, M TI SEROPREVALENCE OF HUMAN-IMMUNODEFICIENCY-VIRUS, HEPATITIS-B VIRUS, HEPATITIS-C VIRUS, AND RAPID PLASMA REAGIN IN A TRAUMA POPULATION SO JOURNAL OF TRAUMA-INJURY INFECTION AND CRITICAL CARE LA English DT Article; Proceedings Paper CT 25th Annual Meeting of the Western-Trauma-Association CY FEB 25-MAR 04, 1995 CL BIG SKY, MT SP W Trauma Assoc ID HIV INFECTION; EMERGENCY; PREVALENCE; RISK AB We evaluated the presence of human immunodeficiency virus (HIV), hepatitis B virus (HBV), hepatitis C virus (HCV), and rapid plasma reagin (RPR) among patients admitted to our trauma unit from April 15 to June 30, 1993. Of 984 patients tested, we found 255 (26%) had evidence of exposure to one or more of these agents: HIV, 4%; HBV, 20%; HCV, 14%; and RPR, 1%. Thirty-eight percent of patients had more than one positive serology, 75% of the HIV patients, 49% of the HBV patients, and 66% of the HCV patients. There was no difference between penetrating and nonpenetrating trauma with respect to any of the viruses. The risk factors for HIV-positive patients were non-White race, positive drug screen, positive alcohol screen, and city resident. Risk factors for HBV patients were non-White race, positive drug screen, and city resident. Risk factors for HBC patients were male sex, non-White race, positive alcohol Screen, positive drug Screen, End city resident. The risk of blood-borne infections in this group of patients is substantial. C1 UNIV MARYLAND,MED CTR,R ADAMS COWLEY SHOCK TRAUMA CTR,DIV SURG TRAUMATOL,BALTIMORE,MD 21201. UNIV MARYLAND,MED CTR,SCH MED,DEPT PATHOL,BALTIMORE,MD 21201. USN,CTR TRAUMA STUDY,EMERGENCY MED SERV,BALTIMORE,MD. CAROLINA MED CTR,DEPT ORTHOPAED SURG,CHARLOTTE,NC. RP CAPLAN, ES (reprint author), UNIV MARYLAND,MED CTR,R ADAMS COWLEY SHOCK TRAUMA CTR,DEPT INFECT DIS,22 S GREENE ST,BALTIMORE,MD 21201, USA. NR 16 TC 27 Z9 28 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1079-6061 J9 J TRAUMA JI J. Trauma-Injury Inf. Crit. Care PD SEP PY 1995 VL 39 IS 3 BP 533 EP 538 PG 6 WC Critical Care Medicine; Surgery SC General & Internal Medicine; Surgery GA TA458 UT WOS:A1995TA45800022 PM 7473920 ER PT J AU TWIGG, ME AF TWIGG, ME TI STRUCTURE OF STACKING-FAULT PYRAMIDS IN SILICON-ON-INSULATOR MATERIAL SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID OXYGEN; SIO2; IMPLANTATION; LAYERS AB Using transmission electron microscopy (TEM), we have analyzed stacking fault pyramids found in multiple implant silicon-on-insulator material. From a comparison of computer simulations with weak-beam TEM images, and from the constraints imposed by crystallography, we have found that the Burgers vectors of the pyramidal stair-rod dislocations are edge dislocations with the Burgers vector 1/3[100]. We have also determined that the stacking faults in these pyramids are intrinsic, and therefore probably formed through vacancy condensation. RP TWIGG, ME (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 32 TC 3 Z9 3 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD SEP-OCT PY 1995 VL 13 IS 5 BP 2341 EP 2347 DI 10.1116/1.579519 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA RV828 UT WOS:A1995RV82800008 ER PT J AU MCGRATH, BJ GUEDRY, FE OMAN, CM RUPERT, AH AF MCGRATH, BJ GUEDRY, FE OMAN, CM RUPERT, AH TI VESTIBULOOCULAR RESPONSE OF HUMAN-SUBJECTS SEATED IN A PIVOTING SUPPORT SYSTEM DURING 3 G(2) CENTRIFUGE STIMULATION SO JOURNAL OF VESTIBULAR RESEARCH-EQUILIBRIUM & ORIENTATION LA English DT Article DE VOR; SPATIAL ORIENTATION; NYSTAGMUS; CENTRIFUGE ID ACCELERATION; PERFORMANCE; NYSTAGMUS; REFLEX AB The vestibulo-ocular reflex (VOR) and spatial orientation perceptions were recorded in 15 subjects during 3 G(z) centrifuge runs, These data were obtained to study two issues: (1) to gain insight into reports of asymmetrical disorientation and disturbance during acceleration and deceleration of centrifuge runs like those used to train pilots on the procedures to counteract G-induced loss of consciousness (G-LOC); (2) to study the effects of sustained vertical linear acceleration on the vestibular system, The centrifuge angular velocity profile consisted of a 19 s angular acceleration to 3 G(z) that was sustained for 5 min during a period of constant angular velocity, and a 19 s deceleration to 1 G(z). The runs were repeated three times with the subject facing the motion and three times with the subject's back to the motion, The VOR and spatial orientation perceptions from the eight subjects who completed all six runs were analyzed, The total VOR response during acceleration and deceleration was composed of interacting angular (AVOR) and linear components (LVOR), Asymmetries in pitch orientation perception between centrifuge acceleration and deceleration were not matched by asymmetries in the total VOR slow phase velocity, During the constant velocity high-G phase of the run, sustained up-beating LVOR (L(z) nystagmus) was present in 14 of the 15 subjects, Significant individual differences in L(z) nystagmus were found, but the maximum L(z) response in our 15 subjects was probably of insufficient magnitude to degrade visual scan of cockpit instruments, Mean magnitudes ranged from 0 to 10 deg/s at 90 s from onset of centrifuge run. C1 MIT, MAN VEHICLE LAB, CAMBRIDGE, MA 02139 USA. UNIV W FLORIDA, DEPT PSYCHOL, PENSACOLA, FL 32514 USA. RP MCGRATH, BJ (reprint author), USN, AEROSP MED RES LAB, 51 HOVEY RD, PENSACOLA, FL 32508 USA. NR 35 TC 28 Z9 28 U1 0 U2 1 PU IOS PRESS PI AMSTERDAM PA NIEUWE HEMWEG 6B, 1013 BG AMSTERDAM, NETHERLANDS SN 0957-4271 EI 1878-6464 J9 J VESTIBUL RES-EQUIL JI J. Vestib. Res.-Equilib. Orientat. PD SEP-OCT PY 1995 VL 5 IS 5 BP 331 EP 347 PG 17 WC Neurosciences; Otorhinolaryngology SC Neurosciences & Neurology; Otorhinolaryngology GA RV470 UT WOS:A1995RV47000001 PM 8528475 ER PT J AU DICKSON, WS HERBERS, THC THORNTON, EB AF DICKSON, WS HERBERS, THC THORNTON, EB TI WAVE REFLECTION FROM BREAKWATER SO JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE LA English DT Article AB A new method is presented for estimating the reflection of a random, multidirectional sea from a coastal structure. The technique is applicable to an array of wave gauges of arbitrary geometry deployed seaward of the reflector. An expansion for small oblique wave-incidence angles is used to derive an approximate relationship between measured array cross-spectra and a small number of parameters that describe the incident-wave properties and the reflectivity of the structure. Model tests with simulated array data demonstrate that the gross properties of incident and reflected waves can be accurately estimated for wave-incidence angles less than about 30 degrees C. The new method is applied to array data acquired offshore of a permeable, rubble-mound breakwater in Monterey Bay, California. The estimated reflection coefficients decrease approximately linearly with increasing frequency. Whereas the observed reflections depend only weakly on the incident-wave energy, the fraction of the incident-wave energy flux transmitted through the breakwater decreases with increasing wave energy, suggesting that dissipation is enhanced with large-amplitude waves. C1 USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. RP DICKSON, WS (reprint author), USN,OIC,NAVTRAMETOC DET,400 RUSSELL AVE,NEW ORLEANS,LA 70143, USA. NR 10 TC 10 Z9 11 U1 1 U2 2 PU ASCE-AMER SOC CIVIL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-950X J9 J WATERW PORT C-ASCE JI J. Waterw. Port Coast. Ocean Eng.-ASCE PD SEP-OCT PY 1995 VL 121 IS 5 BP 262 EP 268 DI 10.1061/(ASCE)0733-950X(1995)121:5(262) PG 7 WC Engineering, Civil; Engineering, Ocean; Water Resources SC Engineering; Water Resources GA RQ980 UT WOS:A1995RQ98000005 ER PT J AU Cartee, RE Brosemer, K Ridgway, SH AF Cartee, RE Brosemer, K Ridgway, SH TI The eye of the bottlenose dolphin (Tursiops truncatus) evaluated by B mode ultrasonography SO JOURNAL OF ZOO AND WILDLIFE MEDICINE LA English DT Article DE ultrasonography; dolphin; eye; Tursiops truncatus ID CORNEAL AB The B mode ultrasonographic images of bottlenose dolphin (Tursiops truncatus) eyes from cadavers and live animals were measured and compared with physical measurements of cadaver eyes. The average sonographic diameters of the cadaver eyes were 2.34 cm x 2.0 cm (cranial-caudal x dorsal-ventral) with an internal circumference of 7.11 cm. Physical measurements of these diameters were not significantly different (2.51 cm x 2.2 cm). Ultrasound measurements of cadaver eye tunic thickness were significantly larger than physical measurements of the same eyes. In Live dolphins, eye diameters measured sonographically were not significantly different (2.55 cm x 2.32 cm) than either ultrasound or physical measurements. The optical axis diameter was 1.80 cm, and the circumference was 7.30 cm in live dolphins. Comparisons of circumference showed no significant difference between cadaver and live dolphin eye measurements. B mode ultrasonographic ocular morphometry may be useful once baseline values have been established. C1 USN,COMMAND CONTROL,SAN DIEGO,CA 92152. USN,OCEAN SURVEILLANCE CTR,RDT&E DIV,SAN DIEGO,CA 92152. RP Cartee, RE (reprint author), AUBURN UNIV,COLL VET MED,DEPT ANAT & HISTOL,AUBURN,AL 36849, USA. NR 12 TC 1 Z9 2 U1 0 U2 1 PU AMER ASSOC Z00 VETERINARIANS PI MEDIA PA 6 NORTH PENNELL ROAD, MEDIA, PA 19063 SN 1042-7260 J9 J ZOO WILDLIFE MED JI J. Zoo Wildl. Med. PD SEP PY 1995 VL 26 IS 3 BP 414 EP 421 PG 8 WC Veterinary Sciences SC Veterinary Sciences GA UC464 UT WOS:A1995UC46400011 ER PT J AU GILMORE, EM AF GILMORE, EM TI MORE THAN COMMON WORDS, ESSAYS ON TRIANA,JOSE THEATER - SPANISH - NIGRO,KF SO LATIN AMERICAN THEATRE REVIEW LA English DT Book Review RP GILMORE, EM (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV KANSAS PI LAWRENCE PA CENTER FOR LATIN AMER STUDIES, LAWRENCE, KS 66045 SN 0023-8813 J9 LAT AM THEATRE REV JI Lat. Am. Theat. Rev. PD FAL PY 1995 VL 29 IS 1 BP 191 EP 193 PG 3 WC Theater SC Theater GA TX226 UT WOS:A1995TX22600029 ER PT J AU BROWN, DG AF BROWN, DG TI INTERNAL DYNAMICS OF INVENTORY-THEORETIC MODELS FOR MICROECONOMIC TRANSPORTATION APPLICATIONS SO LOGISTICS AND TRANSPORTATION REVIEW LA English DT Article AB Freight Service Quality Choice Problems (FSQCPs) range from carrier selection to ship design issues. This paper is primarily concerned with continuous microeconomic FSQCPs, such as maximizing carrier profit as a function of the freight service quality provided. With inventory-theoretic FsQCP applications, the shipper's sensitivity to variations in freight service quality is simulated with an inventory decision model. Desirable inventory model characteristics depend on the problem's structure end the analyst's perspective. In particular, continuous microeconomic FsQCPs require reasonable and well understood shipper cost surfaces over relatively large dependent variable and parameter ranges. The two most popular models in the inventory-theoretic transportation literature are therefore examined with respect to their internal dynamics and cost surfaces. An unexpected tradeoff relationship is discovered with one model, and cost surface deformities are associated with the other. The common assumption that safety stock always increases with shipper inventory cost is also refuted. RP BROWN, DG (reprint author), USN,POSTGRAD SCH,DEPT SYST MANAGEMENT,MONTEREY,CA, USA. RI Brown, Dan/L-8089-2013 OI Brown, Dan/0000-0001-6023-5950 NR 0 TC 3 Z9 3 U1 0 U2 0 PU UNIV BRITISH COLUMBIA PI VANCOUVER PA LOGISTICS & TRANSPORT REVIEW, VANCOUVER BC V6T 1W5, CANADA SN 0047-4991 J9 LOGIST TRANSPORT REV JI Logist. Transp. Rev. PD SEP PY 1995 VL 31 IS 3 BP 253 EP 279 PG 27 WC Operations Research & Management Science; Transportation SC Operations Research & Management Science; Transportation GA TA201 UT WOS:A1995TA20100004 ER PT J AU RIDGEWAY, S REDDY, M AF RIDGEWAY, S REDDY, M TI RESIDUE LEVELS OF SEVERAL ORGANOCHLORINES IN TURSIOPS-TRUNCATUS MILK COLLECTED AT VARIED STAGES OF LACTATION SO MARINE POLLUTION BULLETIN LA English DT Article ID HALICHOERUS-GRYPUS; BLUBBER AB The concentrations of several organochlorines (OCs) were measured in the milk of five healthy bottlenose dolphins, Tursiops truncatus, of various ages and reproductive histories. These dolphins were trained to position at penside to allow for milk collection; samples were collected at various stages of lactation. The highest values in ppm wet weight (lipid, weight in parentheses) were: 10.2 (32.4) p,p'-DDE, 0.586 (1.86) p,p'-DDD, 0.251 (0.797) p,p'-DDT and 4.45 (14.1) PCB (as Aroclor 1254), and were found in milk produced by the oldest dolphin (age 34) during what was probably its first, and orphan-induced, lactation. The lowest values recovered were: 0.330 (1.62) p,p'-DDE, 0.027 (0.132) p,p'-DDD, <0.025 p,p'-DDT and 0.0281 (1.38) PCB, found in milk produced by one of the youngest dolphins (age 16). These data suggest that OCs may be released at levels related to age, reproductive history and lipid content of milk. The collection technique used allows for a serial study without animal injury or mortality. RP USN, COMMAND CONTROL & OCEAN SURVEILLANCE CTR, DIV RDT&E 5107B, DIV BIOSCI, SAN DIEGO, CA 92152 USA. NR 17 TC 36 Z9 39 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0025-326X EI 1879-3363 J9 MAR POLLUT BULL JI Mar. Pollut. Bull. PD SEP PY 1995 VL 30 IS 9 BP 609 EP 614 DI 10.1016/0025-326X(95)00020-N PG 6 WC Environmental Sciences; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA RV936 UT WOS:A1995RV93600011 ER PT J AU FITZGERALD, JW FITZGERALD, ER CAREY, WM VONWINKLE, WA AF FITZGERALD, JW FITZGERALD, ER CAREY, WM VONWINKLE, WA TI BLUBBER AND COMPLIANT COATINGS FOR DRAG REDUCTION IN WATER .2. MATCHED SHEAR IMPEDANCE FOR COMPLIANT LAYER DRAG REDUCTION SO MATERIALS SCIENCE & ENGINEERING C-BIOMIMETIC MATERIALS SENSORS AND SYSTEMS LA English DT Article; Proceedings Paper CT International Conference on Intelligent Materials (ICIM2) CY 1994 CL WILLIAMSBURG, VA DE HYDRODYNAMIC DRAG; BLUBBER; COMPLIANT COATINGS; SHEAR IMPEDANCE; VISCOELASTICITY; DOLPHINS AB The lack of a bioluminescence on a dolphin swimming at a speed of similar to 10 knots demonstrates that its boundary layer remains laminar up to this speed, and the corresponding Reynold's number of Re 2 x 10(7). By contrast, for the equivalent rigid body, the transition from laminar to turbulent flow takes place in the region of Re 5 x 10(5). We identify this effect with special viscoelastic properties of the dolphin's thick (similar to 3 cm) blubber. Preliminary measurements of the complex dynamic shear compliance of blubber shows that it is intermediate between softer compliant coatings that result in an increase in hydrodynamic drag, and harder compliant coatings that have no effect on drag. This appears to be explained by the Matched Shear Impedance Hypothesis. C1 KILDARE CORP,NEW LONDON,CT 06320. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. NR 12 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0928-4931 J9 MAT SCI ENG C-BIOMIM JI Mater. Sci. Eng. C-Biomimetic Mater. Sens. Syst. PD SEP PY 1995 VL 2 IS 4 BP 215 EP 220 DI 10.1016/0928-4931(95)00078-X PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA TG131 UT WOS:A1995TG13100006 ER PT J AU VANDERMEER, RA JENSEN, DJ AF VANDERMEER, RA JENSEN, DJ TI QUANTIFYING RECRYSTALLIZATION NUCLEATION AND GROWTH-KINETICS OF COLD-WORKED COPPER BY MICROSTRUCTURAL ANALYSIS SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID METALS; SIMULATION; EVOLUTION AB Microstructural evolution data describing the recrystallization of cold-worked copper at 394 K (121 degrees C) were obtained by quantitative metallography using scanning electron microscopy and electron backscattered pattern analysis. Using the microstructural path method (MPM), a new analytical representation of the microstructure was devised that emulated all the measurements and successfully explained why simpler representations failed to adequately describe the kinetics of recrystallization in copper. Saturation of preferentially located nucleation sites such as at deformation bands, grain boundaries, etc., where recrystallized grains may cluster in planar arrays before the deformed volume is completely consumed, and time-dependent growth rates matched fully the kinetic behavior of copper during recrystallization. The kinetic behavior of individual texture components (random and cube + cube twin) was also delineated, experimentally and analytically. Precise matching of the analytical representation of the microstructure to experiment allowed calculation of nucleation and growth parameters. These showed that the cube + cube twin grains nucleated at a faster rate than the random grains, that site saturation occurred sooner for the cube + cube twin grains, and that cube + cube twin grains grew at rates about 1.5 times faster than the random grains. The calculations suggested that as recrystallization approached completion, the number of random grains slightly outnumbered the cube + cube twin grains. C1 RISO NATL LAB,DEPT MAT,DK-4000 ROSKILDE,DENMARK. RP VANDERMEER, RA (reprint author), USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375, USA. OI Juul Jensen, Dorte/0000-0001-5096-6602 NR 35 TC 28 Z9 28 U1 1 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD SEP PY 1995 VL 26 IS 9 BP 2227 EP 2235 DI 10.1007/BF02671238 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA RR270 UT WOS:A1995RR27000004 ER PT J AU VANHOY, JR MEEHAN, BT CORRELL, FD MOORE, DM AF VANHOY, JR MEEHAN, BT CORRELL, FD MOORE, DM TI APPLICATION OF A PIXE SCANNING ION MICROPROBE TO METEORITIC SAMPLES SO METEORITICS LA English DT Meeting Abstract C1 USN ACAD,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU METEORITICAL SOC PI FAYETTEVILLE PA DEPT CHEMISTRY/BIOCHEMISTRY, UNIV ARKANSAS, FAYETTEVILLE, AR 72701 SN 0026-1114 J9 METEORITICS JI Meteoritics PD SEP PY 1995 VL 30 IS 5 BP 590 EP 590 PG 1 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA RR518 UT WOS:A1995RR51800230 ER PT J AU DITIZIO, FB HOYLE, SB PRUITT, HL AF DITIZIO, FB HOYLE, SB PRUITT, HL TI AUTONOMIC SHIP CONCEPT SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The Autonomic Ship concept as developed by the Carderock Division, Naval Surface Warfare Center's Innovation Center addresses leveraging advanced computer technology to achieve total systems integration, automation and manning reduction in future ships. The concept integrates distributed architecture, information technologies, and modular systems that utilize the four Autonomic principles; fault tolerant systems, software objects, ubiquitous computing and task and functional analysis. Simply, the vision of the Autonomic Ship can be described as a ship where the people decide what to do and the ship makes it happen. C1 USN,CTR SURFACE WARFARE,CARDEROCK DIV,DEPT COMMUN & CONTROLS TECHNOL,DIGITAL TECHNOL BRANCH,PHILADELPHIA,PA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1995 VL 107 IS 5 BP 19 EP 32 PG 14 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA RX802 UT WOS:A1995RX80200003 ER PT J AU FAIRHEAD, DL HALL, CC AF FAIRHEAD, DL HALL, CC TI INTELLIGENT MACHINERY CONTROL INTEGRATION SO NAVAL ENGINEERS JOURNAL LA English DT Article AB A growing concern about the shrinking size of the U.S. Navy budget and the pool from which selections will be made to ''man'' U. S. Navy shipboard systems has led to investigations on achieving improvements in affordability and operational effectiveness. One such investigation has resulted in the development of the Standard Monitoring and Control System (SMCS), a modular, open architecture control system which includes the control system components for propulsion, electric plant, auxiliaries, and damage control. The first major technology upgrade to SMCS will entail the insertion of Artificial Intelligence (AI) technologies into HM&E monitoring and control applications. The Intelligent Machinery Control Integration Task (IMCI) was established to provide a structural approach for this major technology upgrade. As part of the first phase of IMCI, an identification of intelligent control requirements, an assessment of AI technologies, and a survey of intelligent control applications were performed. This paper lists those HM&E-related shipboard operational requirements from which intelligent machinery control requirements will be identified. Also, there is an initial assessment of AI-related reasoning and the following AI technologies, knowledge-based systems, fuzzy logic, neural nets, and genetic algorithms. The survey provided some insight into applying AI technologies to SMCS shipboard operational requirements. RP FAIRHEAD, DL (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS DETACHMENT,MACHINERY SYST ENGN BRANCH,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1995 VL 107 IS 5 BP 51 EP 57 PG 7 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA RX802 UT WOS:A1995RX80200005 ER PT J AU ELLIOTTBROWN, JA MCPHERSON, SW AF ELLIOTTBROWN, JA MCPHERSON, SW TI NAVSEA LEVEL OF REPAIR ANALYSIS (LORA) SOFTWARE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The Logistics Policy and Appraisal Office in NAVSEA 04 recognized the need for a new Level of Repair Analysis (LORA) process to contend with problems encountered by logistics analysts. Complex algorithms in the military standard which governs LORA (MIL-STD-1390C), and an unwieldy mainframe software model proved a constant irritant to both the analyst and NAVSEA 04. To alleviate this problem, NAVSEA 04 developed a new process, validated with pilot test cases, and published as the NAVSEA LORA Procedures Manual (TL081-AB-PRO-010/LORA). As analysts accepted the process, it became apparent that a custom software application tool was required to adequately implement this LORA process. Logistics analysis procedures are typically produced or refined in the form of specifications or guidance manuals. Users of these procedures and processes may also require software or automated tools to implement the process on complex projects. The LORA procedures manual was NAVSEA 04's initiative to streamline and promote a new LORA process. Port Hueneme Division, Naval Surface Warfare Center (PHD NSWC)-a user needing a LORA software tool-took the initiative to develop a software application of the LORA process to bridge the gap from policy procedures to user acceptance and application. PHD NSWC required an automated tool for a critical upcoming LORA and bridged the gap by applying Total Quality Management (TQM) methods to a software prototyping process. The custom software prototype development and application on the Fire Control System (FCS) MK 92 LORA was successful. NAVSEA encouraged continued software development and, later, approved the PHD NSWC LORA software for command-wide use in conjunction with the NAVSEA LORA Procedures Manual. This paper provides the background for NAVSEA's LORA process and discusses the PHD NSWC success in bridging the gap between process and application for the user. The prototype development of the LORA software is described-explaining the benefits to user acceptance of the NAVSEA LORA procedures. The paper recommends further Improvements and initiatives related to the LORA software, discussing the process in terms of continuous improvement for effective developments. RP ELLIOTTBROWN, JA (reprint author), USN,CTR SURFACE WARFARE,PORT HUENEME DIV,CODE 5A42,PORT HUENEME,CA 93043, USA. NR 0 TC 0 Z9 0 U1 2 U2 5 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1995 VL 107 IS 5 BP 59 EP 65 PG 7 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA RX802 UT WOS:A1995RX80200006 ER PT J AU WILBUR, CH AF WILBUR, CH TI THE REMARKABLE NEVADA STORY SO NAVAL ENGINEERS JOURNAL LA English DT Article RP WILBUR, CH (reprint author), USN,UNDERSEA WARFARE ENGN STN,KEYPORT,WA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1995 VL 107 IS 5 BP 79 EP 83 PG 5 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA RX802 UT WOS:A1995RX80200008 ER PT J AU HOOLEY, JR GOLDEN, DP AF HOOLEY, JR GOLDEN, DP TI THE EFFECT OF POLYLACTIC ACID GRANULES ON THE INCIDENCE OF ALVEOLAR OSTEITIS AFTER MANDIBULAR 3RD MOLAR SURGERY - A PROSPECTIVE RANDOMIZED STUDY SO ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTICS LA English DT Article ID SIMPLEX VIRUS-INFECTION; GLUCONATE ORAL RINSE; 3RD MOLARS; DRY SOCKET; LOCALIZED OSTEITIS; TOOTH EXTRACTION; SURGICAL REMOVAL; CHLORHEXIDINE; SCREWS; COMPLICATIONS AB Objective. To evaluate the effect of polylactic acid granules placed in third molar sockets on the incidence of alveolar osteitis. Study design. A prospective randomized study with 161 patient (322 bilateral impacted mandibular third molars), Results. The sockets in which the polylactic acid granules were placed had a significantly higher rate of alveolar osteitis can (23.6%) than did the control sockets (13.58%). In all subgroups analyzed, the incidence of alveolar osteitis was higher in the experimental (polylactic acid) group. Conclusion. On the basis of the findings of this study, polylactic acid granules do not reduce the incidence of alveolar osteitis and may actually contribute to a higher incidence of alveolar osteitis. C1 USN,DENT CORPS,YOKOSUKA,KANAGAWA,JAPAN. USN,SCH DENT,DEPT ORAL & MAXILLOFACIAL SURG,BETHESDA,MD. NR 41 TC 19 Z9 19 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 1079-2104 J9 ORAL SURG ORAL MED O JI Oral Surg. Oral Med. Oral Pathol. Oral Radiol. Endod. PD SEP PY 1995 VL 80 IS 3 BP 279 EP 283 DI 10.1016/S1079-2104(05)80383-X PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA RV606 UT WOS:A1995RV60600007 PM 7489269 ER PT J AU BARRETT, FJ AF BARRETT, FJ TI CREATING APPRECIATIVE LEARNING CULTURES SO ORGANIZATIONAL DYNAMICS LA English DT Article RP BARRETT, FJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 11 TC 36 Z9 36 U1 0 U2 8 PU AMER MANAGEMENT ASSOC PI NEW YORK PA 135 W 50TH ST, NEW YORK, NY 10020 SN 0090-2616 J9 ORGAN DYN JI Organ. Dyn. PD FAL PY 1995 VL 24 IS 2 BP 36 EP 49 DI 10.1016/0090-2616(95)90070-5 PG 14 WC Business; Psychology, Applied; Management SC Business & Economics; Psychology GA TA626 UT WOS:A1995TA62600003 ER PT J AU GOLAN, H COLTON, JS MOORE, HJ GROSSMAN, Y AF GOLAN, H COLTON, JS MOORE, HJ GROSSMAN, Y TI ANALYSIS OF EVOKED AND SPONTANEOUS QUANTAL RELEASE AT HIGH-PRESSURE IN CRUSTACEAN EXCITATORY SYNAPSES SO PFLUGERS ARCHIV-EUROPEAN JOURNAL OF PHYSIOLOGY LA English DT Article DE GLUTAMATERGIC SYNAPSES; BINOMIAL AND POISSON-TYPE RELEASE; MINIATURE SYNAPTIC CURRENTS; GIANT MINIATURE EXCITATORY POSTSYNAPTIC CURRENTS; HYPERBARIC CONDITIONS; NEUROMUSCULAR JUNCTION ID NEUROMUSCULAR-JUNCTION; HYDROSTATIC-PRESSURE; NEUROTRANSMITTER RELEASE; NERVE-TERMINALS; CRAYFISH MUSCLE; TRANSMITTER; AXON; DIFFERENTIATION; MODULATION; CONDUCTION AB The cellular mechanisms underlying the effect of high pressure on synaptic transmission were studied in the opener muscle of the lobster walking leg. Excitatory postsynaptic currents (EPSCs) were recorded using a loose macropatch-clamp technique at normal pressure and 3.5, 6.9 MPa helium pressure. Responses of the single excitatory axon could be grouped into two types: low-yield (L) synapses exhibiting small EPSCs with a considerable number of failures, and high-yield (H) synapses having larger EPSCs with very few failures. High pressure reduced the average EPSC amplitude in all synapses and shifted their amplitude histograms to the left by decreasing the quantal content (m) without changing their quantum current (q). A binomial distribution fit of EPSC amplitudes revealed that high pressure greatly decreased n, the number of available active zones, but the effect on p, the probability of release for each zone, was not consistent. Many of the spontaneous miniature EPSCs (mEPSCs), observed only in L-type synapses, were ''giant'' (size = 2-5 q). High pressure increased the frequency of the giant mEPSCs but had little effect on their amplitude histogram. High pressure depressed evoked synaptic transmission by modulating the presynaptic quantal release parameters, but concomitantly enhanced spontaneous quantal release by an unknown mechanism. C1 BEN GURION UNIV NEGEV,FAC HLTH SCI,COROB CTR MED RES,DEPT PHYSIOL,IL-84105 BEER SHEVA,ISRAEL. USN,MED RES INST,HIGH PRESSURE MOLEC & CELLULAR NEUROBIOL GRP,BETHESDA,MD 20889. RI GOLAN, HAVA/F-2121-2012 NR 30 TC 9 Z9 9 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0031-6768 J9 PFLUG ARCH EUR J PHY JI Pflugers Arch. PD SEP PY 1995 VL 430 IS 5 BP 617 EP 625 DI 10.1007/BF00386155 PG 9 WC Physiology SC Physiology GA RZ138 UT WOS:A1995RZ13800004 PM 7478912 ER PT J AU SILLS, CF AF SILLS, CF TI HEGEL PYRRHONIAN POETICS SO PHILOSOPHY TODAY LA English DT Article RP SILLS, CF (reprint author), USN ACAD,DEPT HIST,ANNAPOLIS,MD 21402, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU PHILOSOPHY TODAY DEPAUL UNIV PI CHICAGO PA 25 EAST JACKSON BOULEVARD, CHICAGO, IL 60604 SN 0031-8256 J9 PHILOS TODAY JI Philos. Today PD FAL PY 1995 VL 39 IS 3 BP 280 EP 294 PG 15 WC Philosophy SC Philosophy GA TH406 UT WOS:A1995TH40600004 ER PT J AU VOHRA, ST WIESENFELD, K AF VOHRA, ST WIESENFELD, K TI EXPERIMENTAL TEST OF THE NORMAL-FORM FOR PERIOD-DOUBLING BIFURCATIONS SO PHYSICA D LA English DT Article; Proceedings Paper CT Conference on Chaos, Order and Patterns: Aspects of Nonlinearity - The Gran Finale CY SEP 05-10, 1993 CL COMO, ITALY ID NOISE RISE; AMPLIFICATION; SUPPRESSION; DYNAMICS; SYSTEMS; RIBBON AB An experimental investigation of the effects of near-resonant periodic perturbation on subcritical and supercritical bifurcation is carried out. It is observed unambiguously that a periodic perturbation produce a destabilizing shift of a subcritical period doubling bifurcation and a stabilizing shift of supercritical bifurcation. In other words, near resonant perturbations induce subcritical bifurcations and suppress supercritical bifurcations. The experiments also establish the appropriate normal form for periodically perturbed period doubling systems. C1 GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. RP VOHRA, ST (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5670,WASHINGTON,DC 20375, USA. NR 18 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD SEP 1 PY 1995 VL 86 IS 1-2 BP 27 EP 33 DI 10.1016/0167-2789(95)00083-G PG 7 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA RU699 UT WOS:A1995RU69900005 ER PT J AU DITTO, WL SPANO, ML LINDNER, JF AF DITTO, WL SPANO, ML LINDNER, JF TI TECHNIQUES FOR THE CONTROL OF CHAOS SO PHYSICA D LA English DT Article; Proceedings Paper CT Conference on Chaos, Order and Patterns: Aspects of Nonlinearity - The Gran Finale CY SEP 05-10, 1993 CL COMO, ITALY ID DIRECT TRAJECTORIES; TARGETS; SYSTEMS AB The concepts of chaos and its control are reviewed. Both are discussed from an experimental as well as a theoretical viewpoint. Examples are then given of the control of chaos in a diverse set of experimental systems. Current and future applications are discussed. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. COLL WOOSTER,DEPT PHYS,WOOSTER,OH 44691. RP DITTO, WL (reprint author), GEORGIA INST TECHNOL,APPL CHAOS LAB,ATLANTA,GA 30332, USA. RI Spano, Mark/B-6883-2011; OI Ditto, William/0000-0002-7416-8012 NR 18 TC 78 Z9 81 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD SEP 1 PY 1995 VL 86 IS 1-2 BP 198 EP 211 DI 10.1016/0167-2789(95)00101-9 PG 14 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA RU699 UT WOS:A1995RU69900022 ER PT J AU GREAVES, GN NGAI, KL AF GREAVES, GN NGAI, KL TI RECONCILING IONIC-TRANSPORT PROPERTIES WITH ATOMIC-STRUCTURE IN OXIDE GLASSES SO PHYSICAL REVIEW B LA English DT Article ID ALKALI SILICATE-GLASSES; NUCLEAR-SPIN RELAXATION; CONDUCTIVITY-RELAXATION; ELECTRICAL-CONDUCTIVITY; CONDUCTORS; SODIUM; NMR; DIFFUSION; MOBILITY; DYNAMICS AB Structural evidence for the microsegregation of alkalis in oxide glasses is reviewed and the implications for ionic transport, viz., nearest-neighbor hopping, cooperative and correlation effects, are considered. Distinctions are drawn between the hopping of alkalis in silicate glasses, where changes in the configurations of neighboring bridging and nonbridging oxygens are expected, and alkali hopping in fully compensated aluminosilicate glasses where nonbridging oxygens are absent and conformational changes in the network are minimized. A simple expression is introduced for the microscopic energy barrier facing a migrating alkali E(a), and this is corrected to account for the cooperative effects of the other ions involved by dividing by the Kohlrausch exponent beta, which defines the conductivity relaxation function exp[-(t/tau*)beta]. Structural parameters determined by x-ray and NMR spectroscopy enable us to calculate E(a). Conductivity relaxation experiments give a measure of beta. The macroscopic diffusion enthalpy that is measured, W, is given by the ratio E(a)/beta. Thus we are able to show how the local structure of an alkali in a silicate glass can be used to predict the measured diffusion enthalpy. The smaller values of W reported for aluminosilicate glasses are rationalized structurally in terms of the removal of nonbridging oxygens from the modified network. In considering silicate glasses containing small concentrations x of alkali, as this necessarily leads to reductions in alkali microsegregation, decreased cooperative effects and increased hopping distances are expected. Taken together with the attendant fall in the high-frequency dielectric constant and the rise in beta, this combination of changes naturally explains the increased enthalpies observed in low alkali glasses and the rise in alkali diffusion frequency factors. Increased hopping distances are also invoked to explain the crossover dependences of the diffusion coefficients and enthalpies of the separate alkalis in mixed alkali glasses. In particular, the increase in W for a given alkali, as its proportion gamma drops for a fixed alkali concentration x, is attributed to an increase in the hopping distance and can again be predicted from the local structure, providing allowance is made for an associated reduction in cooperative effects. From the separate local structures of the two alkalis, the observed fall in the diffusion coefficients of the two alkalis and the minima in the isothermal de electrical conductivity resulting from the increase in the respective diffusion enthalpies are well reproduced. In addition, the maxima in the measured de electrical conductivity enthalpy W in the Kohlrausch exponent beta and also in the Haven ratio f, all characteristic of alkali mixing, are closely predicted. Finally the increase in magnitude of the mixed alkali effect reported in aluminosilicate glasses is explained in terms of increased cooperativity associated with the reduced energy barriers E(a) for the two alkalis resulting from there being fewer nonbridging oxygens present in the glass structure. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP GREAVES, GN (reprint author), DARESBURY LAB, COUNCIL CENT LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND. NR 62 TC 181 Z9 181 U1 5 U2 35 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1995 VL 52 IS 9 BP 6358 EP 6380 DI 10.1103/PhysRevB.52.6358 PG 23 WC Physics, Condensed Matter SC Physics GA RU546 UT WOS:A1995RU54600037 ER PT J AU RAJAGOPAL, AK BUOT, FA AF RAJAGOPAL, AK BUOT, FA TI TIME-DEPENDENT FUNCTIONAL THEORY FOR SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article AB We develop a Keldysh-Eliashberg-type formalism based on a functional theory for strongly correlated inhomogeneous superconductors subject to time-dependent external forces on the ions, four-vector, and pairing potentials. This theory incorporates exchange-correlation effects including a self-consistent treatment of the electromagnetic vector field as well as the ion motion on equal footing. Thus our theory not only contains but also goes beyond the scope of a recently published time-dependent density functional theory for superconductors. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1995 VL 52 IS 9 BP 6769 EP 6774 DI 10.1103/PhysRevB.52.6769 PG 6 WC Physics, Condensed Matter SC Physics GA RU546 UT WOS:A1995RU54600077 ER PT J AU GUSEV, AA KOHNO, T MARTIN, IM PUGACHEVA, GI TURTELLI, A TYLKA, AJ KUDELA, K AF GUSEV, AA KOHNO, T MARTIN, IM PUGACHEVA, GI TURTELLI, A TYLKA, AJ KUDELA, K TI INJECTION AND FAST RADIAL DIFFUSION OF ENERGETIC ELECTRONS INTO THE INNER MAGNETOSPHERE SO PLANETARY AND SPACE SCIENCE LA English DT Article ID PROTONS AB The role of injection and fast radial diffusion during disturbed magnetospheric conditions in creating the energetic electron population of the inner zone is discussed. The great magnetic storm of February 1986 provides an example of these dramatic processes : energetic electrons were injected and rapidly diffused into the magnetosphere; the old inner zone electron population was depleted; and a new inner zone electron population was created. These injection and rapid diffusion processes also provide a possible explanation for the large flux of high energy (similar to several tens MeV) electrons observed in the inner zone. Such electrons cannot be explained by slow magnetic radial diffusion (D-o = 10(-13) s(-1)) because of synchrotron energy losses. C1 UNICAMP, INST FIS, DEPT RAIOS COSMICOS & CRONOL, BR-13083970 CAMPINAS, BRAZIL. RIKEN, WAKO, SAITAMA 35101, JAPAN. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. SLOVAK ACAD SCI, INST EXPTL PHYS, KOSICE 04353, SLOVAKIA. RI Tylka, Allan/G-9592-2014; Inst. of Physics, Gleb Wataghin/A-9780-2017 NR 12 TC 6 Z9 6 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD SEP PY 1995 VL 43 IS 9 BP 1131 EP 1134 DI 10.1016/0032-0633(95)00041-3 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RU372 UT WOS:A1995RU37200010 ER PT J AU Crutcher, JM Stevenson, MM Sedegah, M Hoffman, SL AF Crutcher, JM Stevenson, MM Sedegah, M Hoffman, SL TI Interleukin-12 and malaria SO RESEARCH IN IMMUNOLOGY LA English DT Article ID CELL STIMULATORY FACTOR; INTERFERON-GAMMA PRODUCTION; NECROSIS-FACTOR-ALPHA; NATURAL-KILLER-CELLS; CD8+ T-CELLS; PLASMODIUM-FALCIPARUM; IFN-GAMMA; MICE; INDUCTION; IMMUNITY C1 USN,RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. MONTREAL GEN HOSP,RES INST,MONTREAL,PQ H3G 1A4,CANADA. NR 42 TC 24 Z9 24 U1 0 U2 0 PU EDITIONS SCIENTIFIQUES ELSEVIER PI PARIS CEDEX 15 PA 141 RUE JAVEL, 75747 PARIS CEDEX 15, FRANCE SN 0923-2494 J9 RES IMMUNOL JI Res. Immunol. PD SEP-OCT PY 1995 VL 146 IS 7-8 BP 552 EP 559 DI 10.1016/0923-2494(96)83031-8 PG 8 WC Immunology SC Immunology GA TW313 UT WOS:A1995TW31300080 PM 8839161 ER PT J AU KOLESKE, DD LEE, GU GANS, BI LEE, KP DILELLA, DP WAHL, KJ BARGER, WR WHITMAN, LJ COLTON, RJ AF KOLESKE, DD LEE, GU GANS, BI LEE, KP DILELLA, DP WAHL, KJ BARGER, WR WHITMAN, LJ COLTON, RJ TI DESIGN AND CALIBRATION OF A SCANNING FORCE MICROSCOPE FOR FRICTION, ADHESION, AND CONTACT POTENTIAL STUDIES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID LASER DIODE; INTERFEROMETER; SENSOR; SYSTEM; FILMS AB We present the design and calibration of a scanning force microscope which can be used to study friction, adhesion, and contact potential differences between the cantilever tip and surface. The microscope uses a modular design where the laser, cantilever/sample holder, reflecting minor, and detector are mounted directly on an optical table. The laser, reflecting mirror, and detector are mounted on translation and rotation stages. With this design the components can be rearranged to calibrate the Z piezo motion as a function of applied voltage. Using the detector micrometers, the detector response (voltage-to-distance relationship) can be determined after each series of measurements. The cantilever/sample holder is constructed such that the components are material matched and thermally compensated from a common reference point. This design feature minimizes thermal drift of the instrument. The instrument can be used in a contact scanning mode where both normal and lateral deflections of the cantilever are measured. In addition, the instrument can be used in frictional force studies, force curve mapping of the surface, and contact potential measurements. We present examples of each, including a detailed account of the instrument design and calibration. (C) 1995 American Institute of Physics. RP KOLESKE, DD (reprint author), USN,RES LAB,DIV CHEM,CODE 6177,WASHINGTON,DC 20375, USA. RI Whitman, Lloyd/G-9320-2011; Lee, Gil/P-8696-2016; OI Whitman, Lloyd/0000-0002-3117-1174; Lee, Gil/0000-0002-7949-5848; Wahl, Kathryn/0000-0001-8163-6964 NR 53 TC 36 Z9 36 U1 2 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD SEP PY 1995 VL 66 IS 9 BP 4566 EP 4574 DI 10.1063/1.1145290 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA RV679 UT WOS:A1995RV67900024 ER PT J AU SIEFRING, CL RODRIGUEZ, P BAUMBACK, MM ANTONIADES, JA WALKER, DN AF SIEFRING, CL RODRIGUEZ, P BAUMBACK, MM ANTONIADES, JA WALKER, DN TI A METHOD FOR MEASURING LARGE CHANGES IN THE PAYLOAD VOLTAGE OF ROCKETS AND SATELLITES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SECONDARY-ELECTRON EMISSION; POTENTIAL MEASUREMENTS; PLASMAS; SHEATH; SPACE; IONOSPHERE; SURFACES; SCATHA AB We present a method for measuring large changes in the electrical potential of a spacecraft. It is known that a spacecraft in the ionosphere can obtain voltages as large as a few kilovolts. Spacecraft charging can occur naturally in the auroral regions due to high-energy streaming electrons or during the operation of active experiments, such as ion/electron beams or electromagnetic tethers. Charging and discharging events are often impulsive in nature and a method fast enough to track these potential changes could be extremely useful. For this purpose we have designed the Naval Research Laboratory Floating Probe (FP). The FP consists of a metallic sphere containing a high-impedance amplifier and a capacitive divider network for scaling large voltages to the range that typical solid state circuits can handle. Operation is similar to other floating probes; when placed in the surrounding ionosphere via a long deployable boom, the sphere quickly attains a voltage that approximates its local plasma potential. By measuring the difference between the sphere potential and the spacecraft-body potential it is possible, under certain circumstances, to determine the payload potential relative to the surrounding region. The probe can be used for either positive or negative polarity measurements, however, the ''worst case'' time response is associated with negative charging since the probe must collect ions to reach the local plasma potential. We tested the FP in a large vacuum chamber and followed this with a successful flight on a sounding rocket (SPEAR III). We will discuss the FP design, construction, theory of operation, and some problems and Limitations encountered during the testing of the instrument. RP SIEFRING, CL (reprint author), USN,RES LAB,CHARGE PARTICLE PHYS BRANCH,DIV PLASMA PHYS,CODE 6755,WASHINGTON,DC 20375, USA. NR 31 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD SEP PY 1995 VL 66 IS 9 BP 4681 EP 4689 DI 10.1063/1.1145307 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA RV679 UT WOS:A1995RV67900042 ER PT J AU MATHEW, J AF MATHEW, J TI VARIABLE GAIN, ZERO OFFSET, DE COUPLED VIDEO-AMPLIFIER FOR MICROWAVE DETECTOR DIODES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A variable gain, zero offset, de coupled video amplifier has been developed which uses a recently introduced +/-5 V operational amplifier with 1.6 GHz gain-bandwidth product. The amplifier is inexpensive and it is particularly suited for amplifying the outputs of microwave diode detectors and driving 50 Omega loads. The large input bias currents of wideband operational amplifiers increase the sensitivity of positive polarity diode detectors, but they decrease the sensitivity when a negative polarity diode detector is used at the amplifier input. To eliminate this effect, matched N-channel junction field-effect transistors (JFETs) are used to buffer the operational amplifier inputs, which reduces the input bias current to similar to 1 pA. An added benefit of the JFETs is that the amplifier offset voltage is unaffected by changes in gain or source impedance. Once the offset is zeroed out, it remains zero for all gains and for any combination of diode detectors connected at the input. The maximum attainable gain-bandwidth product is somewhat lower with the JFETs (typically 400 MHz), but the amplifier operates reliably for gains up to 40-50 dB. RP MATHEW, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 3 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD SEP PY 1995 VL 66 IS 9 BP 4694 EP 4697 DI 10.1063/1.1145309 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA RV679 UT WOS:A1995RV67900044 ER PT J AU VENEZIA, WA HOLT, J AF VENEZIA, WA HOLT, J TI TURBINE UNDER GULF-STREAM - POTENTIAL-ENERGY SOURCE SO SEA TECHNOLOGY LA English DT Article C1 HARBOR BRANCH OCEANOG INST INC,FT PIERCE,FL 34946. RP VENEZIA, WA (reprint author), USN,CTR SURFACE WARFARE,S FLORIDA TESTING FACIL,CARDEROCK DIV,DANIA,FL, USA. NR 9 TC 2 Z9 2 U1 1 U2 1 PU COMPASS PUBL INC PI ARLINGTON PA SUITE 1000 1117 N 19 ST, ARLINGTON, VA 22209 SN 0093-3651 J9 SEA TECHNOL JI Sea Technol. PD SEP PY 1995 VL 36 IS 9 BP 10 EP 14 PG 5 WC Engineering, Ocean SC Engineering GA RW458 UT WOS:A1995RW45800002 ER PT J AU FULLER, WC AF FULLER, WC TI THE ORIGINS OF THE CRIMEAN-WAR - GOLDFRANK,DM SO SLAVIC REVIEW LA English DT Book Review RP FULLER, WC (reprint author), USN,WAR COLL,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SLAVIC STUDIES PI STANFORD PA JORDAN QUAD/ACACIA, STANFORD UNIV, 125 PANAMA ST, STANFORD, CA 94305-4130 SN 0037-6779 J9 SLAVIC REV JI Slavic Rev. PD FAL PY 1995 VL 54 IS 3 BP 766 EP 767 DI 10.2307/2501782 PG 2 WC Area Studies; Humanities, Multidisciplinary SC Area Studies; Arts & Humanities - Other Topics GA TJ485 UT WOS:A1995TJ48500051 ER PT J AU HENDERSON, DR AF HENDERSON, DR TI ECONOMIC MIRACLES SO SOCIETY LA English DT Article C1 WASHINGTON UNIV,CTR STUDY AMER BUSINESS,ST LOUIS,MO. RP HENDERSON, DR (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0147-2011 J9 SOCIETY JI Society PD SEP-OCT PY 1995 VL 32 IS 6 BP 59 EP 67 DI 10.1007/BF02693372 PG 9 WC Social Sciences, Interdisciplinary; Sociology SC Social Sciences - Other Topics; Sociology GA RP829 UT WOS:A1995RP82900016 ER PT J AU ROSENBERG, A DILELLA, DP AF ROSENBERG, A DILELLA, DP TI ENHANCED RAMAN-SPECTRA OF C-60 ADSORBED ON COLD-DEPOSITED SILVER AND INDIUM SURFACES SO SOLID STATE COMMUNICATIONS LA English DT Article DE FULLERENES; SURFACES AND INTERFACES; OPTICAL PROPERTIES; INELASTIC LIGHT SCATTERING ID ELECTRONIC-STRUCTURE; RESONANCE-RAMAN; METAL-SURFACES; SOLID C-60; SCATTERING; FILMS; C60; SPECTROSCOPY; MOLECULES; C-70 AB Enhanced Raman spectra of C-60 monolayers adsorbed on continuous cold-deposited silver and indium surfaces are reported; no enhancement is observed on dielectric surfaces. Surprisingly, this enhancement of the spectra of C-60 On Ag and In increases significantly as the surfaces are annealed towards room temperature; such annealed surfaces do not exhibit surface-enhanced Raman scattering for other adsorbates, such as benzene. We suggest that this unusual enhancement results from a resonant Raman process involving the metal-C-60 interaction, which includes electron transfer to C-60. The interaction also modifies the spectral line shapes of adsorbed C-60. C1 SHEPHERD COLL,DEPT CHEM,SHEPHERDSTOWN,WV 25443. RP ROSENBERG, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 TC 5 Z9 5 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD SEP PY 1995 VL 95 IS 10 BP 729 EP 733 DI 10.1016/0038-1098(95)00342-8 PG 5 WC Physics, Condensed Matter SC Physics GA RK593 UT WOS:A1995RK59300014 ER PT J AU CHRISTIANSON, KA MOGLESTUE, C ANDERSON, WT AF CHRISTIANSON, KA MOGLESTUE, C ANDERSON, WT TI FAILURE MECHANISMS IN ALGAAS/GAAS HEMTS SO SOLID-STATE ELECTRONICS LA English DT Article; Proceedings Paper CT Topical Workshop on Heterostructure Microelectronics CY AUG 17-19, 1994 CL SUSONO CITY, JAPAN SP Asian Off Aerospace Res & Dev, Soc Non Tradit Technol, IEEE,, EDS, IEEE, MTT DE HEMT; FAILURE MECHANISMS; DEGRADATION; OHMIC CONTACT ID MESFETS AB Failure mechanisms in AlGaAs/GaAs high electron mobility transistors (HEMTs) life tested under high temperature storage, high temperature with d.c. bias, and high temperature with d.c. bias under r.f. drive have been determined to differ significantly. Monte Carlo modeling has been used to explain the experimental data, which shows evidence of gate sinking, ohmic contact degradation, and trapped charge formation near the two-dimensional gas (2DEG). Of particular interest is the evidence of damage from hot carriers under the stress conditions of high temperature with d.c. bias under r.f. drive, which most closely simulates actual use conditions. C1 FRAUNHOFER INST APPL SOLID STATE PHYS,D-79108 FREIBURG,GERMANY. RP CHRISTIANSON, KA (reprint author), USN,RES LAB,CODE 6855,WASHINGTON,DC 20375, USA. NR 11 TC 5 Z9 5 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD SEP PY 1995 VL 38 IS 9 BP 1623 EP 1626 DI 10.1016/0038-1101(95)00058-2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA RU230 UT WOS:A1995RU23000014 ER PT J AU HANSEN, TH AF HANSEN, TH TI TREATMENT STRATEGIES AND RESEARCH IDEAS FOR THE OLDER PERSON - FORESHADOW SO TOPICS IN GERIATRIC REHABILITATION LA English DT Editorial Material RP HANSEN, TH (reprint author), USN RESERVES,ORLANDO,FL, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASPEN PUBL INC PI FREDERICK PA 7201 MCKINNEY CIRCLE, FREDERICK, MD 21701 SN 0882-7524 J9 TOP GERIATR REHABIL JI Top. Geriatr. Rehabil. PD SEP PY 1995 VL 11 IS 1 BP 87 EP 88 PG 2 WC Gerontology; Rehabilitation SC Geriatrics & Gerontology; Rehabilitation GA RQ879 UT WOS:A1995RQ87900013 ER PT J AU MATTIE, DR MARTIN, LS CHILDRESS, TA AF MATTIE, DR MARTIN, LS CHILDRESS, TA TI PROGRAM-DEVELOPMENT IN MILITARY TOXICOLOGY LABORATORIES SO TOXICOLOGY LETTERS LA English DT Article; Proceedings Paper CT Workshop on Decision Support Methodologies for Human Health Risk Assessment of Toxic Substances CY OCT 18-20, 1993 CL ATLANTA, GA SP Agcy Tox Subst & Dis Registry, EPA, Halogenated Solvents Ind Alliance, NCI, NIEHS, NLM, Wright Patterson Air Force Base, Armstrong Lab DE MILITARY TOXICOLOGY; TRI-SERVICE TOXICOLOGY; PROGRAM DEVELOPMENT; DEPARTMENT OF DEFENSE AB Military toxicology evolved from needs identified during the World Wars. The Army, Navy and Air Force developed toxicological capabilities in response to their respective operational needs. These 3 previously separate military toxicology efforts have been integrated into Tri-Service Toxicology in response to the continually changing and growing operational needs of the military. The continual process of program development must be initiated in order for Tri-Service Toxicology to improve, grow and better serve its customers. Program development entails developing and maintaining good customer relationships and cooperative relationships with other governmental agencies, industry and academia. The benefits of identifying and obtaining customers and collaborators will substantially outweigh the costs incurred by committing to the implementation of program development within Tri-Service Toxicology. C1 GEOCENTERS INC,USN,MED RES INST,DETACHMENT TOXICOL,WRIGHT PATTERSON AFB,OH 45433. RP MATTIE, DR (reprint author), ARMSTRONG LAB,DIV TOXICOL,WRIGHT PATTERSON AFB,OH 45433, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCI PUBL IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0378-4274 J9 TOXICOL LETT JI Toxicol. Lett. PD SEP PY 1995 VL 79 IS 1-3 BP 291 EP 295 DI 10.1016/0378-4274(95)03380-4 PG 5 WC Toxicology SC Toxicology GA RW526 UT WOS:A1995RW52600034 PM 7570668 ER PT J AU SANCHEZ, JL HAYASHI, KE KRUGER, HF MEZA, R ENGLISH, CK VIDAL, W SVENNERHOLM, AM TAYLOR, DN AF SANCHEZ, JL HAYASHI, KE KRUGER, HF MEZA, R ENGLISH, CK VIDAL, W SVENNERHOLM, AM TAYLOR, DN TI IMMUNOLOGICAL RESPONSE TO VIBRIO-CHOLERAE O1 INFECTION AND AN ORAL CHOLERA VACCINE AMONG PERUVIANS SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article DE CHOLERA; VACCINE; EFFICACY; SAFETY ID TOXIGENIC ESCHERICHIA-COLI; B-SUBUNIT; IMMUNOGENICITY; DIARRHEA; SAFETY; PROTECTION; VOLUNTEERS AB A 'double-blind', randomized, placebo controlled study of an oral inactivated whole cell plus recombinant B subunit (WC/rBS) cholera vaccine was conducted during February-March 1992 in Peru in 346 military recruits, 307 (89%) of whom received 2 oral doses of vaccine or Escherichia coli K12 placebo 2 weeks apart. Paired serum samples were obtained from 155 (50%) of the recipients of 2 doses. An epidemic of cholera took place between doses. No difference in cholera attack rates was detected between vaccine and placebo recipients after one dose (8% versus 14%). Seroconversion (4-fold or higher increase in vibriocidal antibody titres) was detected in 90% and 80% of vaccine and placebo recipients, respectively, with low pre-existing vibriocidal titres (< 0.01). The anti-cholera toxin seroconversion rate among those with low pre-existing titres was higher in vaccinated subjects (97%) than in placebo recipients (68%) (P < 0.01). Administration of 2 doses of WC/rBS vaccine concomitantly with natural V. cholerae O1 infection enhanced the serum anti-cholera toxin response. The immune response to the whole cell component of the vaccine was reduced by high pre-existing vibriocidal antibody titres. C1 USN,ENVIRONM & PREVENT MED UNIT 2,NORFOLK,VA 23511. USN,MED RES INST DETACHMENT,LIMA,PERU. CTR MED NAVAL,CALLAO,PERU. UNIV GOTHENBURG,DEPT MED MICROBIOL & IMMUNOL,GOTHENBURG,SWEDEN. RP SANCHEZ, JL (reprint author), USA,MED RES UNIT BRAZIL,AMER CONSULATE RIO,UNIT 3501,APO,AA 34030, USA. NR 16 TC 8 Z9 8 U1 0 U2 3 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD SEP-OCT PY 1995 VL 89 IS 5 BP 542 EP 545 DI 10.1016/0035-9203(95)90103-5 PG 4 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA TH049 UT WOS:A1995TH04900029 PM 8560536 ER PT J AU BALL, R HIMM, J HOMER, LD THALMANN, ED AF BALL, R HIMM, J HOMER, LD THALMANN, ED TI DOES THE TIME-COURSE OF BUBBLE EVOLUTION EXPLAIN DECOMPRESSION-SICKNESS RISK SO UNDERSEA & HYPERBARIC MEDICINE LA English DT Article DE MODEL; DIFFUSION EQUATION; PRESSURE; DIVING ID SPINAL-CORD; SOLUBILITY; TRANSPORT; VOLUME; BLOOD; GAS AB A probabilistic model of decompression sickness (DCS) risk based on linear-exponential (LE) kinetics has given the best fit of the human air and nitrox DCS database. To test the hypothesis that its success may be due to the formation of a gas phase during decompression, we developed a physiologically based bubble evolution model using a numerical solution of a partial differential equation system. Because of the computational intensity of this method, it could not be used to fully explore our hypothesis. Consequently, we compared the solution with that of a computationally simpler approximation that was previously published by Van Liew and found the two approaches gave similar results. Using the simpler model, assuming bubble densities of 1 and 1,000 bubbles/cm(3), we found a tissue time constant of at least 80 min (equivalent to perfusion of 1/80 ml . g(-1) . min(-1)) was required to achieve a delay in bubble dissolution comparable to the prolonged risk of DCS predicted by the LE model. We suggest that the persistence of single bubbles in a uniformly perfused homogeneous tissue alone is unlikely to explain persistent DCS risk. RP BALL, R (reprint author), USN,MED RES INST,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 32 TC 16 Z9 17 U1 0 U2 0 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 1066-2936 J9 UNDERSEA HYPERBAR M JI Undersea Hyperb. Med. PD SEP PY 1995 VL 22 IS 3 BP 263 EP 280 PG 18 WC Marine & Freshwater Biology; Medicine, Research & Experimental SC Marine & Freshwater Biology; Research & Experimental Medicine GA RQ552 UT WOS:A1995RQ55200006 PM 7580767 ER PT J AU DOBOS, PH LIND, RJ ELSBERRY, RL AF DOBOS, PH LIND, RJ ELSBERRY, RL TI SURFACE WIND COMPARISONS WITH RADAR WIND PROFILER OBSERVATIONS NEAR TROPICAL CYCLONES SO WEATHER AND FORECASTING LA English DT Article ID LANDFALL AB A special set of radar wind profiler observations during the Tropical Cyclone Motion (TCM-90) held experiment is used to relate lower-tropospheric winds to surface sustained winds and gusts on the west coast of Okinawa. Owing to the passage of four typhoons at various separation distances, hourly comparisons are possible for lower-tropospheric wind speeds ranging from 0 to 40 m s(-1). Regressions with nonzero intercepts provide more accurate estimates than simple ratios between lower-tropospheric winds and surface sustained winds and gusts. Little difference is found in use of a layer-average wind between 600 and 1800 m compared to regressions for individual levels. Stratification of the data into daytime and nighttime regression equations markedly improves surface sustained wind and gust predictions for wind speeds below 30 m s(-1). It is recommended that these daytime and nighttime regression equations be used to estimate surface winds over coastal regions when lower-tropospheric wind observations are available or when a tropical island wind report is available and a lower-tropospheric wind speed estimate is required. C1 USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943. NR 14 TC 1 Z9 2 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD SEP PY 1995 VL 10 IS 3 BP 564 EP 575 DI 10.1175/1520-0434(1995)010<0564:SWCWRW>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA RQ784 UT WOS:A1995RQ78400009 ER PT J AU GOLDBERG, L MCELHANON, RW BURNS, WK AF GOLDBERG, L MCELHANON, RW BURNS, WK TI BLUE-LIGHT GENERATION IN BULK PERIODICALLY FIELD POLED LINBO3 SO ELECTRONICS LETTERS LA English DT Article DE LITHIUM NIOBATE; OPTICAL HARMONIC GENERATION ID 2ND-HARMONIC GENERATION AB Bulk field poled LiNbO3 with a 3.3 mu m domain period is used to frequency double unguided infrared emission generated by a high power semiconductor laser. At 432 nm, 2.8 mW is generated with CW and 10.5 mW with modelocked operation, respectively. Photorefractive effects are observed at room temperature. C1 MARYLAND ADV DEV LAB,GREENBELT,MD 20770. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 23 Z9 23 U1 0 U2 2 PU IEE-INST ELEC ENG PI HERTS PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTS, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD AUG 31 PY 1995 VL 31 IS 18 BP 1576 EP 1577 DI 10.1049/el:19951055 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA RV301 UT WOS:A1995RV30100036 ER PT J AU BERMUDEZ, VM AF BERMUDEZ, VM TI CHARACTERIZATION OF A ZR M-XI (HV=151.6 EV) SOURCE FOR SOFT-X-RAY PHOTOEMISSION SPECTROSCOPY SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article DE ELECTRON ENERGY ANALYZER; M-XI EMISSION; SOFT X-RAY PHOTOEMISSION SPECTROSCOPY ID LEAST-SQUARES ANALYSIS; CORE LEVEL SPECTRA; M-ZETA-RADIATION; PHOTOELECTRON-SPECTROSCOPY; SIMPLE METALS; XPS; DECONVOLUTION; SURFACES; GROWTH; FILMS AB The M zeta emission of a Zr anode (h nu = 151.6 eV) is characterized for use in soft X-ray photoemission spectroscopy. The Fermi edge spectrum of Al is recorded as a function of the resolution of the electron energy analyzer. Least-squares fits are performed using a Fermi-Dirac function convoluted with a gaussian-broadened lorentzian representing the combined effects of the Zr M zeta natural linewidth (0.77 eV), inhomogeneous broadening of the M zeta spectrum and finite analyzer resolution. The empirical system resolution function thus determined is deconvoluted from core-level or valence-band data for Au, Al and GaN, resulting in enhanced resolution. Least-squares fits of the resolution-enhanced core levels with gaussian-broadened lorentzian (GaN Ga3d) or Doniach-Sunjic (A12p) functions are performed and lineshape parameters obtained. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 10 Z9 10 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD AUG 31 PY 1995 VL 73 IS 3 BP 249 EP 259 DI 10.1016/0368-2048(95)02348-8 PG 11 WC Spectroscopy SC Spectroscopy GA RV359 UT WOS:A1995RV35900002 ER PT J AU BAILEY, W POPOVICH, B JONES, KL AF BAILEY, W POPOVICH, B JONES, KL TI MONOZYGOTIC TWINS DISCORDANT FOR THE RUSSELL-SILVER SYNDROME SO AMERICAN JOURNAL OF MEDICAL GENETICS LA English DT Article DE MONOZYGOTIC TWINS; RUSSELL-SILVER SYNDROME; DNA FINGERPRINTING ID RING CHROMOSOME-15; GROWTH AB Russell-Silver syndrome (RSS) is a pattern of malformation characterized by intrauterine and postnatal growth retardation, limb asymmetry, triangular face, and hypospadias. We report on a patient, from a triplet pregnancy, who was one of identical male twins discordant for RSS. R.B. was a 710-g male born at 33 weeks of gestation, with hypospadias, chordee, and undescended testes. He had a normal 46,XY karyotype and no renal abnormalities. Female triplet A weighed 1,843 g, and male triplet B weighed 1,920 g. Both had normal physical findings and neonatal period. R.B. was first seen by us at age 6 7/12 years with short stature, triangular and asymmetric face, lower limb length discrepancy, and surgically repaired genital anomalies. Growth hormone testing results were normal. At age 8 7/12 years the brothers appeared physically identical ex cept for size, with a height differential of 114.25 vs. 121.5 cm. Testing to establish biological zygosity was performed using VNTR (variable number tandem repeat) DNA probes YNH24 (D2S44), CMM101 (D14S13), EFD52 (D17S26), TBQ7 (D10S28), and 3'HVR (D16S85), PCR loci MCT118 (D1S80), and HLA-DQ alpha. These data indicate a >99.99% probability of triplets B and C being monozygotic twins. While most occurrences of RSS are sporadic, familial cases suggesting autosomal dominance have been reported. Three other cases of probable monozygotic twins with RSS have been described. The significance of this confirmation of discordance in determining the cause of RSS is discussed. (C) 1995 Wiley-Liss, Inc. C1 UNIV CALIF SAN DIEGO,SCH MED,DEPT PEDIAT,LA JOLLA,CA 92093. USN HOSP,DEPT PEDIAT,PENSACOLA,FL. OREGON HLTH SCI UNIV,DEPT MOLEC & MED GENET,PORTLAND,OR. NR 25 TC 23 Z9 24 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0148-7299 J9 AM J MED GENET JI Am. J. Med. Genet. PD AUG 28 PY 1995 VL 58 IS 2 BP 101 EP 105 DI 10.1002/ajmg.1320580202 PG 5 WC Genetics & Heredity SC Genetics & Heredity GA RP836 UT WOS:A1995RP83600001 PM 8533797 ER PT J AU JUSTUS, BL HUSTON, AL AF JUSTUS, BL HUSTON, AL TI ULTRAVIOLET DOSIMETRY USING THERMOLUMINESCENCE OF SEMICONDUCTOR-DOPED VYCOR GLASS SO APPLIED PHYSICS LETTERS LA English DT Article ID TEMPERATURE TREATMENT; UV AB Radiation dosimetry in the ultraviolet is described using the intrinsic ultraviolet response of a novel thermoluminescent semiconductor-doped Vycor glass. A linear response to 185 nm light was measured over the range 0.1 to 1000 mu J/cm(2). The long wavelength limit of the sensitivity of the glass is similar to 290 nm, indicating the utility of the glass as an effective solar blind dosimeter. (C) 1995 American Institute of Physics. RP JUSTUS, BL (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 16 TC 10 Z9 10 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 28 PY 1995 VL 67 IS 9 BP 1179 EP 1181 DI 10.1063/1.114999 PG 3 WC Physics, Applied SC Physics GA RR042 UT WOS:A1995RR04200001 ER PT J AU FILIPKOWSKI, ME KREBS, JJ PRINZ, GA GUTIERREZ, CJ AF FILIPKOWSKI, ME KREBS, JJ PRINZ, GA GUTIERREZ, CJ TI GIANT NEAR-90-DEGREES COUPLING IN EPITAXIAL COFE/MN/COFE SANDWICH STRUCTURES SO PHYSICAL REVIEW LETTERS LA English DT Article ID FERROMAGNETIC LAYERS; EXCHANGE; FE; OSCILLATIONS; MECHANISM AB Trilayer samples of CoFe/Mn/CoFe(001) have been prepared by molecular beam epitaxy and investigated by magnetometry and ferromagnetic resonance (FMR). Very strong near-90 degrees coupling (up to 2.5 ergs/cm(2)) between the CoFe layers, with no evidence for 180 degrees coupling, was found in all but the thickest Mn-layer samples. The field dependence of the magnetization requires that the coupling energy have the algebraic form F-c = C-+(phi(1) - phi(2))(2) + C--(phi(1) - phi(2) - pi)(2) suggested recently for antiferromagnetic interlayers. The observed angular dependence of both the acoustic and optical FMR modes found can be described by this model. C1 USN,RES LAB,WASHINGTON,DC 20375. SW TEXAS STATE UNIV,DEPT PHYS,SAN MARCOS,TX 78666. RP FILIPKOWSKI, ME (reprint author), UNIV ARKANSAS,DEPT PHYS,FAYETTEVILLE,AR 72701, USA. NR 17 TC 68 Z9 69 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 28 PY 1995 VL 75 IS 9 BP 1847 EP 1850 DI 10.1103/PhysRevLett.75.1847 PG 4 WC Physics, Multidisciplinary SC Physics GA RQ990 UT WOS:A1995RQ99000042 ER PT J AU SWEARINGEN, JD CROUCH, JD HANDLER, RA AF SWEARINGEN, JD CROUCH, JD HANDLER, RA TI DYNAMICS AND STABILITY OF A VORTEX RING IMPACTING A SOLID BOUNDARY SO JOURNAL OF FLUID MECHANICS LA English DT Article ID CHANNEL FLOW; FREE-SURFACE; SECONDARY INSTABILITY; REYNOLDS-NUMBER; WALL; LAYER; LAMINAR; MODEL; WAVES; PAIR AB Direct numerical simulations were used to study the dynamics of a vortex ring impacting a wail at normal incidence. The boundary layer formed as the ring approaches the wall undergoes separation and roll-up to form a secondary vortex ring. The secondary ring can develop azimuthal instabilities which grow rapidly owing to vortex stretching and tilting in the presence of the mean strain field generated by the primary Vortex ring. The stability of the secondary ring was investigated through complementary numerical experiments and stability analysis. Both perturbed and unperturbed evolutions of the secondary ring were simulated at a Reynolds number of about 645, based on the initial primary-ring propagation velocity and ring diameter. The linear evolution of the secondary vortex-ring instability was modelled analytically by making use of a quasi-steady approximation. This allowed a localized stability analysis following Widnall and Sullivan's (1973) earlier treatment of an isolated vortex ring. Amplitude evolution and growth-rate predictions from this analysis are in good agreement with the simulation results. The analysis shows that the secondary vortex ring is unstable to long-wavelength perturbations, even though an isolated ring having similar characteristics would be stable. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 37 TC 33 Z9 35 U1 0 U2 7 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD AUG 25 PY 1995 VL 297 BP 1 EP 28 DI 10.1017/S0022112095002977 PG 28 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA RT402 UT WOS:A1995RT40200001 ER PT J AU SCHMIDT, PP AF SCHMIDT, PP TI HYDROGEN-BONDING AND EXCHANGE IN EXTENDED STRUCTURES - DNA SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID RAMAN-SPECTROSCOPY; ELECTRON-TRANSFER; PROTON-TRANSFER; POTENTIALS; MODES; HELIX; PAIR AB A quantum mechanical analysis of the motion of two hydrogenic species (hydrogen atoms or protons) inside a planar array of other atoms uses model potentials to explore the effect of delocalization and exchange on the hydrogen bonds in DNA. The assembly of base pairs in DNA may allow further delocalization of hydrogen along the chain to form conduction bands. Possible hydrogen exchange within base pairs together with migration along the chain axis suggests that some of the stability of DNA arises through hydrogen conduction to repair bonding defects. C1 OFF NAVAL RES,DIV MAT,ARLINGTON,VA 22217. RP SCHMIDT, PP (reprint author), OFF NAVAL RES,DIV CHEM,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 46 TC 0 Z9 0 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 24 PY 1995 VL 99 IS 34 BP 12693 EP 12697 DI 10.1021/j100034a001 PG 5 WC Chemistry, Physical SC Chemistry GA RR250 UT WOS:A1995RR25000001 ER PT J AU BROIDO, DA REINECKE, TL AF BROIDO, DA REINECKE, TL TI USE OF QUANTUM-WELL SUPERLATTICES TO OBTAIN HIGH FIGURE OF MERIT FROM NONCONVENTIONAL THERMOELECTRIC-MATERIALS - COMMENT SO APPLIED PHYSICS LETTERS LA English DT Note C1 USN,RES LAB,WASHINGTON,DC 20375. RP BROIDO, DA (reprint author), BOSTON COLL,DEPT PHYS,CHESTNUT HILL,MA 02167, USA. NR 4 TC 41 Z9 42 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 21 PY 1995 VL 67 IS 8 BP 1170 EP 1171 DI 10.1063/1.114998 PG 2 WC Physics, Applied SC Physics GA RQ002 UT WOS:A1995RQ00200044 ER PT J AU MOSTOVYCH, AN CHAN, LY KEARNEY, KJ GARREN, D IGLESIAS, CA KLAPISCH, M ROGERS, FJ AF MOSTOVYCH, AN CHAN, LY KEARNEY, KJ GARREN, D IGLESIAS, CA KLAPISCH, M ROGERS, FJ TI OPACITY OF DENSE, COLD, AND STRONGLY COUPLED PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ABSORPTION-MEASUREMENTS; IRON; HOT AB The physics of dense [(1-5) x 10(19) cm(-3)],cold (1-15 eV), strongly coupled (Gamma similar to 0.7) plasmas is probed with 0.351, 0.527, and 1.054 mu m opacity measurements in well characterized, laser-heated, aluminum plasmas. Current opacity models are tested, for the first time, in the regime where the probing photon energies are of the same order as the average interparticle interaction energies in the plasma. Predicted enhancements of the opacity at low temperatures are not observed, but overall agreement between experiment and theory is within a factor of 2. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. ARTEP INC,COLUMBIA,MD 20899. RP MOSTOVYCH, AN (reprint author), USN,RES LAB,DIV PLASMA PHYS,LASER PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 19 TC 19 Z9 21 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 21 PY 1995 VL 75 IS 8 BP 1530 EP 1533 DI 10.1103/PhysRevLett.75.1530 PG 4 WC Physics, Multidisciplinary SC Physics GA RP993 UT WOS:A1995RP99300025 ER PT J AU BUCCA, D KELLER, TM AF BUCCA, D KELLER, TM TI BLENDING STUDIES BETWEEN ORGANIC AND INORGANIC ARYLACETYLENIC MONOMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 9 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25901278 ER PT J AU MUSHRUSH, GW AF MUSHRUSH, GW TI PETROLEUM-PRODUCTS - STABILITY AND INCOMPATIBILITY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,FUELS SECT,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 10 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25900820 ER PT J AU VONTERSCH, RL PHILLIPS, RS URBAN, JJ AF VONTERSCH, RL PHILLIPS, RS URBAN, JJ TI SYNTHESIS AND PROPERTIES OF BETA,BETA-DIFLUOROFLUOROTYROSINES BY F-19 NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY AND COMPUTATIONAL CHEMISTRY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USDA,MED CHEM DEF RES INST,BIOCHEM PHARMACOL BRANCH,APG EA,MD 21010. UNIV GEORGIA,DEPT CHEM,ATHENS,GA 30602. UNIV GEORGIA,DEPT BIOCHEM,ATHENS,GA 30602. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 20 EP FLUO PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25601698 ER PT J AU PIKE, JK HO, T WYNNE, KJ AF PIKE, JK HO, T WYNNE, KJ TI TIME-DEPENDENT DYNAMIC CONTACT-ANGLE ANALYSIS OF POLY(DIMETHYLSILOXANE-URETHANE-UREA) SEGMENTED BLOCK-COPOLYMER FILMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 24 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25901291 ER PT J AU KEMNER, KM HUNTER, DB ELAM, WT BERTSCH, PM AF KEMNER, KM HUNTER, DB ELAM, WT BERTSCH, PM TI EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE STUDIES OF CS DIBENZO-18-CROWN-6 ETHER COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. SAVANNAH RIVER ECOL LAB,DIV BIOEGOCHEM,AIKEN,SC 29802. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 28 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25900284 ER PT J AU CHAKARIAN, V AF CHAKARIAN, V TI STUDIES OF MAGNETIC-MATERIALS VIA CIRCULAR POLARIZED X-RAYS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,BNL,NSLS,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 48 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25900303 ER PT J AU TONG, WM SHUH, DK JIMENEZ, I FEILER, D WILLIAMS, RS CARLISLE, JA SUTHERLAND, DGS TERMINELLO, LJ TREECE, RE HORWITZ, JS HIMPSEL, FJ AF TONG, WM SHUH, DK JIMENEZ, I FEILER, D WILLIAMS, RS CARLISLE, JA SUTHERLAND, DGS TERMINELLO, LJ TREECE, RE HORWITZ, JS HIMPSEL, FJ TI NEXAFS OF PULSED-LASER DEPOSITED BN, CNX, AND GAN FILMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. USN,RES LAB,WASHINGTON,DC 20375. IBM CORP,YORKTOWN HTS,NY 10598. RI Jimenez, Ignacio/F-7422-2010 OI Jimenez, Ignacio/0000-0001-5605-3185 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 55 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25900310 ER PT J AU BITTERWOLF, TE BAYS, JT FIERRO, R RHEINGOLD, AL SHADE, JE AF BITTERWOLF, TE BAYS, JT FIERRO, R RHEINGOLD, AL SHADE, JE TI EVIDENCE FOR THE MECHANISM OF THE TWIST PHOTOCHEMICAL-REARRANGEMENT OF RING COUPLED BIMETALLIC COMPOUNDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV IDAHO,DEPT CHEM,MOSCOW,ID 83844. UNIV DELAWARE,DEPT CHEM,NEWARK,DE 19716. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 58 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25602162 ER PT J AU SUNDAR, RA KELLER, TM AF SUNDAR, RA KELLER, TM TI POLYDIACETYLENE COPOLYMERS CONTAINING SILICON AND BORON - PRECURSORS TO THERMALLY AND OXIDATIVELY STABLE THERMOSETS AND CERAMICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 59 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25901326 ER PT J AU TURNER, NH BARGER, WR MOWERY, RL AF TURNER, NH BARGER, WR MOWERY, RL TI ANALYSIS OF METAL-IONS BY CAPILLARY ZONE ELECTROPHORESIS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 83 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25600431 ER PT J AU TOLLES, WM AF TOLLES, WM TI NANOSCIENCE AND NANOTECHNOLOGY - A PERSPECTIVE FOR CHEMICAL OPPORTUNITIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 85 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25901557 ER PT J AU COOK, MY HAYES, EA BESSEL, CA ROLLISON, DR AF COOK, MY HAYES, EA BESSEL, CA ROLLISON, DR TI ION-EXCHANGE OF ALUMINOSILICATE ZEOLITES IN NONAQUEOUS ELECTROLYTE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 100 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25601145 ER PT J AU MARKOWITZ, MA CHOW, GM SINGH, A AF MARKOWITZ, MA CHOW, GM SINGH, A TI PHOSPHOLIPID-MEMBRANES AS TEMPLATES FOR SYNTHESIS OF GOLD NANOPARTICLES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,MOLEC INTERFACIAL INTERACT LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 137 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25901609 ER PT J AU GABER, BP TURNER, DC BRANDOW, SL PEEK, BM AF GABER, BP TURNER, DC BRANDOW, SL PEEK, BM TI MOLECULAR MACHINING WITH SCANNING PROBE MICROSCOPES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,MOLEC INTERFACIAL INTERACT,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 157 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25601202 ER PT J AU EPSTEIN, JW BIRNBERG, GH FANSHAWE, WJ KAYAKIRI, H RICE, KC ROTHMAN, RB XU, H BECKETTS, K AF EPSTEIN, JW BIRNBERG, GH FANSHAWE, WJ KAYAKIRI, H RICE, KC ROTHMAN, RB XU, H BECKETTS, K TI THE ENANTIOMERS OF 6,6-DIMETHOXY-5-(3-HYDROXYPENYL)-3-METHYL-3-AZABICYCLO-[3.2.0]HEPTANE AND THEIR BINDING-PROPERTIES AT OPIOID RECEPTOR SUBTYPES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 WYETH AYERST RES,PEARL RIVER,NY 10965. NIH,BETHESDA,MD 20892. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 161 EP MEDI PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25900159 ER PT J AU SON, DY KELLER, TM AF SON, DY KELLER, TM TI OXIDATIVELY STABLE LINEAR CARBORANE-SILOXANE-DIACETYLENE COPOLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 205 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25901471 ER PT J AU REEVE, SW WEIMER, WA AF REEVE, SW WEIMER, WA TI OPTICAL-EMISSION SPECTROSCOPY AS A TEMPERATURE PROBE FOR A DC ARCJET DIAMOND CVD REACTOR SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARKANSAS STATE UNIV,DEPT CHEM BIOCHEM & PHYS,STATE UNIV,AR 72467. USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 224 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25901139 ER PT J AU SOTO, MR AF SOTO, MR TI RATE-CONSTANT DETERMINATIONS FOR HBO+F CHANNELS FROM AB-INITIO REACTION-PATH CALCULATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 264 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP259 UT WOS:A1995RP25901179 ER PT J AU RAPP, JE AF RAPP, JE TI MIXED-METAL OXIDES AS ALTERNATE CATHODES FOR HIGH-ENERGY DENSITY ELECTRIC SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 330 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25602432 ER PT J AU BESSEL, CA CORCORAN, S ROLISON, DR AF BESSEL, CA CORCORAN, S ROLISON, DR TI ELECTROCATALYSIS WITH COBALT(SALEN) IN ZEOLITES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 385 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25602487 ER PT J AU BESSEL, CA ROLISON, DR AF BESSEL, CA ROLISON, DR TI REACTIVITY OF PT, RUOX AND CO(SALEN) IN ZEOLITES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 434 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25602535 ER PT J AU HEUER, WB PEARSON, WH AF HEUER, WB PEARSON, WH TI EFFECTS OF PERIPHERAL SUBSTITUTION ON THE PROPERTIES OF METAL-DITHIOCROCONATE COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 494 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25602595 ER PT J AU BESSEL, CA ROLISON, DR AF BESSEL, CA ROLISON, DR TI NANOSCALE ELECTRODES IN ZEOLITE SCAFFOLDING SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 20 PY 1995 VL 210 BP 704 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA RP256 UT WOS:A1995RP25602803 ER PT J AU HENRY, JP GIOIA, IM HUCHRA, JP BURG, R MCLEAN, B MACGILLIVRAY, H CRUDDACE, RG AF HENRY, JP GIOIA, IM HUCHRA, JP BURG, R MCLEAN, B MACGILLIVRAY, H CRUDDACE, RG TI GROUPS OF GALAXIES IN THE ROSAT NORTH ECLIPTIC POLE SURVEY SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMOLOGY, THEORY; GALAXIES, STATISTICS; SURVEYS; X-RAYS, GALAXIES ID X-RAY-EMISSION; DARK MATTER; VELOCITY DISPERSION; REDSHIFT SURVEY; CFA SURVEY; CLUSTERS; LUMINOSITY; CATALOG; FIELD AB We present the first measurement of the ensemble properties of X-ray-selected groups of galaxies. Their X-ray luminosity and temperature functions are a smooth extrapolation from rich clusters of galaxies. The X-ray-selected groups have a spiral fraction which is about a factor of 2 smaller than optically selected groups, possibly because the X-ray selection produces a more dynamically evolved sample. The binding masses of these groups and their contribution to the density of the universe is typical of those found from analyses of optically selected samples, but our estimates were derived from completely different selection criteria and mass measurements. C1 CNR,IST RADIOASTRON,I-00185 ROME,ITALY. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. MAX PLANCK INST EXTRATERR PHYS,D-85740 GARCHING,GERMANY. ROYAL OBSERV,EDINBURGH EH9 3HJ,MIDLOTHIAN,SCOTLAND. USN,RES LAB,WASHINGTON,DC 20375. RP HENRY, JP (reprint author), INST ASTRON,2680 WOODLAWN DR,HONOLULU,HI 96822, USA. RI Gioia, Isabella/B-6982-2012 OI Gioia, Isabella/0000-0003-3127-498X NR 31 TC 39 Z9 39 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1995 VL 449 IS 2 BP 422 EP 430 DI 10.1086/176067 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RP424 UT WOS:A1995RP42400004 ER PT J AU GAUME, RA CLAUSSEN, MJ DEPREE, CG GOSS, WM MEHRINGER, DM AF GAUME, RA CLAUSSEN, MJ DEPREE, CG GOSS, WM MEHRINGER, DM TI THE SAGITTARIUS-B2 STAR-FORMING REGION .1. SENSITIVE 1.3 CENTIMETER CONTINUUM OBSERVATIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE H II REGIONS; ISM, INDIVIDUAL (SAGITTARIUS B2); ISM, STRUCTURE; RADIO CONTINUUM, ISM; STARS, FORMATION ID H-II REGIONS; RADIO-CONTINUUM; SHELL; MAPS; LINE AB The radio continuum toward the Sgr B2 region of star formation has been imaged at a wavelength of 1.3 cm with a spatial resolution of approximate to 2000 AU (0 ''.(25) and a sensitivity of approximate to 0.4 mJy beam(-1). These high-quality images show many newly detected continuum components and reveal remarkable features associated with several previously known H II regions. Current models of ultracompact H II regions are discussed within the context of these new data. The images detail 49 individual continuum components within the Sgr B2 complex. Half of these have diameters less than 5000 AU, including several unresolved components (diameters < 2100 AU). These H II regions may be explained by a disk photoevaporation model. There are many asymmetrically bright shell-like and arclike H II regions in Sgr B2. The asymmetries observed in the 1.3 cm continuum from these shell-like and arclike H II regions correspond to gradients in the 20 cm --> 1.3 cm spectral indices, reflecting gradients in the electron densities within many of these H II regions. These shell- and arclike sources may be best described by an ''improved'' champagne flow model, incorporating stellar winds and significant gradients in the density of ambient neutral material. Numerous filamentary structures are seen in images of the long-tail cometary H II region Sgr B2 I. At least three components are identified in the tail region exhibiting two different position angles on the plane of the sky. The morphology may result from an interaction between the ionized gas of Sgr B2 I and external winds which originate within the nearby Sgr B2 F cluster of H II regions. C1 USN,RES LAB,WASHINGTON,DC 20375. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. UNIV N CAROLINA,DEPT PHYS & ASTRON,CHAPEL HILL,NC 27599. UNIV ILLINOIS,URBANA,IL 61801. RP GAUME, RA (reprint author), USN OBSERV,CODE EO,3450 MASSACUETTES AVE NW,WASHINGTON,DC 20392, USA. NR 28 TC 82 Z9 83 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1995 VL 449 IS 2 BP 663 EP 673 DI 10.1086/176087 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RP424 UT WOS:A1995RP42400024 ER PT J AU MACOMB, DJ AKERLOF, CW ALLER, HD ALLER, MF BERTSCH, DL BRUHWEILER, F BUCKLEY, JH CARTERLEWIS, DA CAWLEY, MF CHENG, KP DERMER, C FEGAN, DJ GAIDOS, JA GEAR, WK HALL, CR HARTMAN, RC HILLAS, AM KAFATOS, M KERRICK, AD KNIFFEN, DA KONDO, Y KUBO, H LAMB, RC MAKINO, F MAKISHIMA, K MARSCHER, A MCENERY, J MCHARDY, IM MEYER, DI MOORE, EM RAMOS, E ROBSON, EI ROSE, HJ SCHUBNELL, MS SEMBROSKI, G STEVENS, JA TAKAHASHI, T TASHIRO, M WEEKES, TC WILSON, C ZWEERINK, J AF MACOMB, DJ AKERLOF, CW ALLER, HD ALLER, MF BERTSCH, DL BRUHWEILER, F BUCKLEY, JH CARTERLEWIS, DA CAWLEY, MF CHENG, KP DERMER, C FEGAN, DJ GAIDOS, JA GEAR, WK HALL, CR HARTMAN, RC HILLAS, AM KAFATOS, M KERRICK, AD KNIFFEN, DA KONDO, Y KUBO, H LAMB, RC MAKINO, F MAKISHIMA, K MARSCHER, A MCENERY, J MCHARDY, IM MEYER, DI MOORE, EM RAMOS, E ROBSON, EI ROSE, HJ SCHUBNELL, MS SEMBROSKI, G STEVENS, JA TAKAHASHI, T TASHIRO, M WEEKES, TC WILSON, C ZWEERINK, J TI MULTIWAVELENGTH OBSERVATIONS OF MARKARIAN-421 DURING A TEV X-RAY FLARE SO ASTROPHYSICAL JOURNAL LA English DT Article DE BL LACERTAE OBJECTS, GENERAL; BL LACERTAE OBJECTS, INDIVIDUAL (MARKARIAN 421) ID SIMULTANEOUS MULTIFREQUENCY OBSERVATIONS; LACERTAE OBJECT MARKARIAN-421; EMISSION AB A TeV flare from the BL Lac object Mrk 421 was detected in May of 1994 by the Whipple Observatory air Cherenkov experiment during which the flux above 250 GeV increased by nearly an order of magnitude over a 2-day period. Contemporaneous observations by ASCA showed the X-ray flux to be in a very high state. We present these results, combined with the first ever simultaneous or nearly simultaneous observations at GeV gamma-ray, UV, IR, mm, and radio energies for this nearest BL Lac object. While the GeV gamma-ray flux increased slightly, there is little evidence for variability comparable to that seen at TeV and X-ray energies. Other wavelengths show even less variability. This provides important constraints on the emission mechanisms at work. We present the multiwavelength spectrum of this gamma-ray blazar for both quiescent and flaring states and discuss the data in terms of current models of blazar emission. C1 UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT ASTRON,ANN ARBOR,MI 48109. CATHOLIC UNIV AMER,WASHINGTON,DC 20064. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. ST PATRICKS COLL,DEPT PHYS,MAYNOOTH,KILDARE,IRELAND. USN,RES LAB,DIV SPACE SCI,WASHINGTON,DC 20375. PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. ROYAL OBSERV,EDINBURGH EH9 3HJ,MIDLOTHIAN,SCOTLAND. UNIV LEEDS,DEPT PHYS,LEEDS LS2 9JT,W YORKSHIRE,ENGLAND. GEORGE MASON UNIV,CSI,INST SCI & TECHNOL,SPACE SCI PROGRAM,FAIRFAX,VA 22030. HAMPDEN SYDNEY COLL,DEPT PHYS & ASTRON,HAMPDEN SYDNEY,VA 23943. UNIV TOKYO,DEPT PHYS,BUNKYO KU,TOKYO 113,JAPAN. INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN. BOSTON UNIV,DEPT ASTRON,BOSTON,MA 02215. UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND. JOINT ASTRON CTR,HILO,HI 96720. UNIV CENT LANCASHIRE,CTR ASTROPHYS,PRESTON PR1 2HE,LANCS,ENGLAND. UNIV COLL DUBLIN,DEPT PHYS,DUBLIN 4,IRELAND. HARVARD SMITHSONIAN CTR ASTROPHYS,WHIPPLE OBSERV,AMADO,AZ 85645. RP MACOMB, DJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771, USA. RI McEnery, Julie/D-6612-2012; Tashiro, Makoto/J-4562-2012 NR 27 TC 119 Z9 121 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1995 VL 449 IS 2 BP L99 EP L103 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RP425 UT WOS:A1995RP42500001 ER PT J AU WANG, YM AF WANG, YM TI ON THE TORQUE EXERTED BY A MAGNETICALLY THREADED ACCRETION DISK SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION, ACCRETION DISKS; STARS, MAGNETIC FIELDS; STARS, ROTATION ID NEUTRON STAR MAGNETOSPHERE; X-RAY BINARIES; CATACLYSMIC VARIABLES; BLACK-HOLES; SPIN-DOWN; FIELDS; PULSAR; EVOLUTION; ROTATION; SYSTEMS AB Simple expressions are derived for the torque exerted by an accretion disk on a rotating, magnetized object (which may, for example, be a neutron star, a white dwarf, or a T Tauri star). In the equilibrium state (for which there is no net torque on the star), the inner edge of the Keplerian disk R(0) is located very close to the corotation radius R,, for physically plausible assumptions about the dissipation time of the wound-up field component; the equilibrium value omega(crit) Of the ''fastness parameter'' omega=(R(0)/R(c))(3/2) lies in the range 0.875-0.95. Empirical constraints requiring omega(crit) to be significantly less than unity are thus incompatible with the magnetically threaded disk model. RP WANG, YM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7672W,WASHINGTON,DC 20375, USA. NR 35 TC 95 Z9 96 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1995 VL 449 IS 2 BP L153 EP L156 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RP425 UT WOS:A1995RP42500014 ER PT J AU WANG, YM AF WANG, YM TI EMPIRICAL RELATIONSHIP BETWEEN THE MAGNETIC-FIELD AND THE MASS AND ENERGY FLUX IN THE SOURCE REGIONS OF THE SOLAR-WIND SO ASTROPHYSICAL JOURNAL LA English DT Article DE SOLAR WIND; SUN, CORONA; SUN, MAGNETIC FIELDS ID CORONAL HOLES; MODELS; FLOW AB Using daily averages of the solar wind speed and mass density measured at Earth together with an improved method for extrapolating the observed photospheric field to 1 AU, we construct scatter plots relating the coronal field strength B-0 to the mass flux density rho(0) upsilon(0) and the total energy flux density F-w0 at the coronal base. On average, both rho(0) upsilon(0) and F-w0 increase roughly linearly with B-0; they also show a monotonic increase with the coronal flux-tube expansion factor. However, the wind speed at Earth, determined by the ratio F-w0/(rho(0) upsilon)(0) is essentially independent of B-0, while tending to decrease with increasing expansion factor (as found in earlier studies). RP WANG, YM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 25 TC 29 Z9 29 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1995 VL 449 IS 2 BP L157 EP L160 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RP425 UT WOS:A1995RP42500015 ER PT J AU THOMS, BD RUSSELL, JN AF THOMS, BD RUSSELL, JN TI IDENTIFICATION OF A SURFACE AZIDE FROM THE REACTION OF HN3 WITH C(100) SO SURFACE SCIENCE LA English DT Letter DE DIAMOND; ELECTRON ENERGY LOSS SPECTROSCOPY; HYDROGEN AZIDE; LOW INDEX SINGLE CRYSTAL SURFACES; MOLECULE-SOLID REACTIONS; NITRIDES; SURFACE CHEMICAL REACTION ID VIBRATIONAL-SPECTRA; MOLECULAR-STRUCTURE; HYDRAZOIC ACID; ORGANIC AZIDES; DIAMOND; SOLIDS AB The reaction of hydrogen azide, HN,, with bare and hydrogenated diamond (100) was studied using high resolution electron energy loss spectroscopy (HREELS). Hydrogen azide adsorbs molecularly on the hydrogenated diamond surface at: 100 K and desorbs without reacting at < 273 K. In contrast, HN, reacts with C(100) at 100 K by breaking the N-H bond to form C-N-3 and C-H surface species. The breaking of the N-H bond is in contrast to the reaction mechanism of HN3 on Si and Ge surfaces in which breaking of the HN-NN bond is observed. We suggest that the stronger bonding of hydrogen to the diamond surface is responsible. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RI Russell, John/A-3621-2009 NR 37 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD AUG 20 PY 1995 VL 337 IS 1-2 BP L807 EP L811 DI 10.1016/0039-6028(95)80040-9 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA RQ749 UT WOS:A1995RQ74900007 ER PT J AU STRUGNELL, S BYFORD, V MAKIN, HLJ MORIARTY, RM GILARDI, R LEVAN, LW KNUTSON, JC BISHOP, CW JONES, G AF STRUGNELL, S BYFORD, V MAKIN, HLJ MORIARTY, RM GILARDI, R LEVAN, LW KNUTSON, JC BISHOP, CW JONES, G TI 1-ALPHA,24(S)-DIHYDROXYVITAMIN D-2 - A BIOLOGICALLY-ACTIVE PRODUCT OF 1-ALPHA-HYDROXYVITAMIN D-2 MADE IN THE HUMAN HEPATOMA, HEP3B SO BIOCHEMICAL JOURNAL LA English DT Article ID IDENTIFICATION; METABOLISM; ANALOGS; RAT; 24-HYDROXYVITAMIN-D2; ACTIVATION; VITAMIN-D2; PATHWAY; GENE AB A major metabolite of the vitamin D analogue 1 alpha-hydroxyvitamin D-2 in human liver cells in culture has been identified as 1 alpha,24(S)-dihydroxyvitamin D-2 [1 alpha,24(S)-(OH)(2)D-2]. 1 alpha-Hydroxyvitamin D-3 incubated with the same cells gives rise to predominantly 25- and 27-hydroxylated products. Our identification of 1 alpha 24(S)-dihydroxyvitamin D-2 is based on comparisons of the liver cell metabolite;with chemically synthesized 1 alpha,24(S)-(OH)(2)D-2 and 1 alpha,24(R)-(OH)(2)D-2 by using HPLC, GC and GC-MS techniques. The stereochemical orientation of the 24-hydroxyl group was inferred after X-ray-crystallographic analysis of the 24(R)-OH epimer. 1 alpha,24(S)-Dihydroxyvitamin D-2 binds strongly to the vitamin D receptor and is biologically active in growth hormone and chloramphenicol acetyltransferase reporter gene expression systems in vitro, but binds poorly to rat vitamin D-binding globulin, DBP. We suggest that this metabolite, 1 alpha,24(S)-(OH)(2)D-2, possesses the spectrum of biological properties to be useful as a drug in the treatment of psoriasis, metabolic bone disease and cancer. C1 QUEENS UNIV,DEPT BIOCHEM,KINGSTON,ON K7L 3N6,CANADA. QUEENS UNIV,DEPT MED,KINGSTON,ON K7L 3N6,CANADA. UNIV LONDON,LONDON HOSP,COLL MED,DEPT CHEM PATHOL,LONDON E1 2AD,ENGLAND. STEROIDS LTD,CHICAGO,IL 60612. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. LUMER CORP,MADISON,WI 53713. NR 23 TC 48 Z9 48 U1 0 U2 0 PU PORTLAND PRESS PI LONDON PA 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ SN 0264-6021 J9 BIOCHEM J JI Biochem. J. PD AUG 15 PY 1995 VL 310 BP 233 EP 241 PN 1 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA RN733 UT WOS:A1995RN73300033 PM 7646451 ER PT J AU SMITH, WS SUMNICHT, GE SHARPE, RW SAMUELSON, D MILLARD, FE AF SMITH, WS SUMNICHT, GE SHARPE, RW SAMUELSON, D MILLARD, FE TI GRANULOCYTE-COLONY-STIMULATING FACTOR VERSUS PLACEBO IN ADDITION TO PENICILLIN-G IN A RANDOMIZED BLINDED STUDY OF GRAM-NEGATIVE PNEUMONIA SEPSIS - ANALYSIS OF SURVIVAL AND MULTISYSTEM ORGAN FAILURE SO BLOOD LA English DT Article ID TUMOR-NECROSIS-FACTOR; CELL LUNG-CANCER; FACTOR G-CSF; SEPTIC SHOCK; CHEMOTHERAPY; INTERLEUKIN-1; NEUTROPENIA; ENDOTOXIN; RABBITS; RESPONSES AB Sepsis is a common cause of morbidity and mortality. Neutrophils are the major defense against bacterial invasion, and granulocyte colony-stimulating factor (G-CSF) augments both neutrophil number and function. In our study, 160 rabbits were inoculated transtracheally with 0.5 mL of a solution containing 10(4) colony forming units per milliliter of Pasteurella multocida. Twenty-four hours later, chest xrays and quantitative blood cultures demonstrated pneumonia and bacteremia. Therapy was then begun with penicillin G and either recombinant human G-CSF (rG-CSF; 5 to 8 mu g/ kg subcutaneously) or placebo every day for 5 days. Arterial blood gases and 23 other parameters of organ function were performed before inoculation and serially thereafter. All rabbits underwent histologic examination of organs at the time of septic death or when sacrificed on day 6. A total of 149 rabbits survived long enough to initiate therapy. A significant increase in leukocytes by day 4 was found in the rG-CSF-treated group. There was a trend towards improved survival in the rG-CSF group (77% v 67%; P = .13, n = 149). Analysis of pretreatment variables revealed sepsis-induced leukopenia (less than or equal to 2,800/mu L) as the only predictor of significantly improved survival with rG-CSF treatment (57% v 39%; P = .04, n = 73). The majority of the survival benefit occurred within the first 24 hours of treatment. This was before the time that a significant difference in mean white blood cell (WBC) count was observed between the study groups, making intravascular leukocytosis an unlikely explanation for the survival advantage in the rG-CSF group. No significant difference in laboratory variables reflecting organ function was demonstrated between the groups. Histologic grading of inflammation (0, normal, to 6, necrosis) in seven organs revealed that the surviving rabbits had mild but statistically significant increased inflammation in the liver, spleen, and noninoculated lung in the rG-CSF versus placebo groups (liver: 2.6 v 1.5, P less than or equal to .0001; spleen: 3.2 v 2.3, P less than or equal to .0001; and noninoculated lung: 2.9 v 2.5, P = .04). Administration of rG-CSF, in addition to penicillin G, in immune competent rabbits with gram-negative sepsis complicated by leukopenia significantly improved survival over antibiotics alone. The administration of rG-CSF in early sepsis for a short therapeutic duration was not associated with any clinically evident toxicity. Clinical trials using rG-CSF in septic patients with leukopenia are indicated. C1 USN,MED CTR,DEPT INTERNAL MED,DIV HEMATOL ONCOL,SAN DIEGO,CA 92134. USN,MED CTR,DEPT LAB,SAN DIEGO,CA 92134. USN,MED CTR,DEPT PHARM,SAN DIEGO,CA 92134. SAN DIEGO STATE UNIV,DEPT BIOL,SAN DIEGO,CA 92182. RP SMITH, WS (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 50 TC 53 Z9 53 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD AUG 15 PY 1995 VL 86 IS 4 BP 1301 EP 1309 PG 9 WC Hematology SC Hematology GA RN467 UT WOS:A1995RN46700010 PM 7543303 ER PT J AU MOGLESTUE, C BUOT, FA ANDERSON, WT AF MOGLESTUE, C BUOT, FA ANDERSON, WT TI ENSEMBLE MONTE-CARLO PARTICLE INVESTIGATION OF HOT-ELECTRON-INDUCED SOURCE-DRAIN BURNOUT CHARACTERISTICS OF GAAS FIELD-EFFECT TRANSISTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The lattice heating rate has been calculated for GaAs field-effect transistors of different source-drain channel design by means of the ensemble Monte Carlo particle model. Transport of carriers in the substrate and the presence of free surface charges are also included in our simulation. The actual heat generation was obtained by accounting for the energy exchanged with the lattice of the semiconductor during phonon scattering. It was found that the maximum heating rate takes place below the surface near the drain end of the gate. The results correlate well with a previous hydrodynamic energy transport estimate of the electronic energy density, but shifted slightly more towards the drain. These results further emphasize the adverse effects of hot electrons on the Ohmic contacts. (C) 1995 American Institute of Physics. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MOGLESTUE, C (reprint author), FRAUNHOFER INST APPL SOLID STATE PHYS,TULLASTR 72,D-79108 FREIBURG,GERMANY. NR 10 TC 16 Z9 16 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 15 PY 1995 VL 78 IS 4 BP 2343 EP 2348 DI 10.1063/1.360153 PG 6 WC Physics, Applied SC Physics GA RP718 UT WOS:A1995RP71800025 ER PT J AU WRIGHT, AO SELTZER, MD GRUBER, JB CHAI, BHT AF WRIGHT, AO SELTZER, MD GRUBER, JB CHAI, BHT TI SITE-SELECTIVE SPECTROSCOPY AND DETERMINATION OF ENERGY-LEVELS IN EU3+-DOPED STRONTIUM FLUOROPHOSPHATE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID EARTH; LUMINESCENCE; APATITES; LASER; IONS AB Absorbance and site-selective fluorescence studies of Eu3+:Sr-5(PO4)(3)F (Eu:SFAP) provide a nearly complete characterization of the Eu3+ energy levels. These results are compared with calculated energies generated by lattice-sum analysis. Eu3+ is found to occupy one site predominantly, but numerous minority sites are also evident; polarization studies of absorption and fluorescence lines provide evidence for the principle site having C-s symmetry. Vibronic transitions occur in spectra as well. Interpretation of the lattice location and charge compensation mechanism for the principal site is discussed in the context of obstacles arising from spectral interpretation, high crystal fields in SFAP, low site symmetry, low J-numbers in Eu3+ energy manifolds, and lattice covalency. Eu2+ emission upon ultraviolet excitation is also demonstrated; valleys in the emission profile are attributed to intracrystal absorption by Eu3+. (C) 1995 American Institute of Physics. C1 SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192. UNIV CENT FLORIDA,CTR RES ELECTROOPT & LASERS,ORLANDO,FL 32836. RP WRIGHT, AO (reprint author), USN,CTR AIR WARFARE,DIV RES & TECHNOL,CHINA LAKE,CA 93555, USA. NR 36 TC 57 Z9 58 U1 1 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 15 PY 1995 VL 78 IS 4 BP 2456 EP 2467 DI 10.1063/1.360099 PG 12 WC Physics, Applied SC Physics GA RP718 UT WOS:A1995RP71800042 ER PT J AU PROKES, SM CARLOS, WE AF PROKES, SM CARLOS, WE TI OXYGEN DEFECT CENTER RED ROOM-TEMPERATURE PHOTOLUMINESCENCE FROM FRESHLY ETCHED AND OXIDIZED POROUS SILICON SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HYDROGENATED AMORPHOUS-SILICON; VISIBLE LUMINESCENCE; OPTICAL-PROPERTIES; LIGHT-EMISSION; HOLE-CENTERS; SI; MECHANISM; WAFERS; GLASS AB Electron spin resonance and photoluminescence experiments have been performed on freshly etched and oxidized porous silicon. Results indicate the presence of oxygen-related centers (nonbridging oxygen-hole center clusters), which consist of similar core structures in as-made and oxidized porous silicon (PSi) samples. A direct correlation exists between the presence of these centers and a red photoluminescence observed in both freshly anodized and oxidized PSi, suggesting that this emission process is the result of optical transitions in the oxygen-hole centers. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 35 TC 124 Z9 124 U1 1 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 15 PY 1995 VL 78 IS 4 BP 2671 EP 2674 DI 10.1063/1.360716 PG 4 WC Physics, Applied SC Physics GA RP718 UT WOS:A1995RP71800074 ER PT J AU MOR, G KLINMAN, DM SHAPIRO, S HAGIWARA, E SEDEGAH, M NORMAN, JA HOFFMAN, SL STEINBERG, AD AF MOR, G KLINMAN, DM SHAPIRO, S HAGIWARA, E SEDEGAH, M NORMAN, JA HOFFMAN, SL STEINBERG, AD TI COMPLEXITY OF THE CYTOKINE AND ANTIBODY-RESPONSE ELICITED BY IMMUNIZING MICE WITH PLASMODIUM-YOELII CIRCUMSPOROZOITE PROTEIN PLASMID DNA SO JOURNAL OF IMMUNOLOGY LA English DT Article ID DIRECT GENE-TRANSFER; IMMUNE-RESPONSES; B-CELLS; INTERFERON-GAMMA; T-CELLS; MOUSE MUSCLE; IFN-GAMMA; INVIVO; EXPRESSION; PROTECTION AB The number, type, and location of cytokine- and Ab-secreting cells activated in mice immunized and boosted with plasmid DNA encoding the circumsporozoite protein of the malarial parasite Plasmodium yoelii (PyCSP) were monitored. The initial humoral response was localized to the draining lymph nodes and was characterized by the production of IgG1 anti-PyCSP Abs and the Th2 cytokine IL-4. In contrast, the secondary response was dominated by lFN-gamma production (a Th1 cytokine) and the secretion of IgG2a anti-PyCSP Abs in the spleen. PyCSP DNA and mRNA were detected only in the quadriceps muscles (sites of plasmid injection), yet these sites lacked either cytokine- or Ab-secreting cells. These findings indicate that circulating lymphocytes encounter plasmid-encoded Ag in the muscle bed, initiate a humoral response in the draining lymph nodes, and then seed distal lymphoid organs. Profound differences were observed between the primary and secondary immune responses induced by plasmid immunization, which may influence vaccine efficacy. C1 US FDA,CTR BIOL EVALUAT & RES,DIV VIRAL PROD,RETROVIRUS RES LAB,RETROVIRAL IMMUNOL SECT,BETHESDA,MD 20892. USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. VICAL INC,SAN DIEGO,CA 92121. MITRE CORP,MCLEAN,VA 22102. NR 43 TC 106 Z9 111 U1 0 U2 1 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD AUG 15 PY 1995 VL 155 IS 4 BP 2039 EP 2046 PG 8 WC Immunology SC Immunology GA RN464 UT WOS:A1995RN46400041 PM 7636255 ER PT J AU RENDELL, RW AF RENDELL, RW TI EFFECT OF POLARIZATION SCREENING LENGTH ON ELECTRON-PUMP COTUNNELING ERRORS SO PHYSICAL REVIEW B LA English DT Note ID SMALL TUNNEL-JUNCTIONS; ACCURACY; CHARGE AB We have calculated cotunneling errors occurring in the electron pump, including the effects of polarization screening length as determined by the gate-to-junction capacitance ratio. Previous analyses have been done in the limit of very large screening length, or equivalently in the limit of a very small. ratio of gate-to-junction capacitance, where cotunneling errors are at most of order (N-1) for an N-junction pump for a restricted range of end-to-end bias. Within this same range, we find that the calculated cotunneling errors can increase significantly with increasing capacitance ratios 0.15-0.3, which encompass those reported for several experimental pumps in the literature. With realistic parameters, the calculated first-, second-, third-, and fourth-order cotunneling errors increase the error of a five-junction pump by factors of between 2 and 10 over much of the range of end-to-end bias and by up to a factor of 5 X 10(3) toward the negative end of the bias range. We discuss the implications of these results for recent experimental observations which are at least two orders of magnitude larger than calculations based on very small capacitance ratios. RP USN, RES LAB, CODE 6813, WASHINGTON, DC 20375 USA. NR 18 TC 6 Z9 6 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1995 VL 52 IS 7 BP 4684 EP 4687 DI 10.1103/PhysRevB.52.4684 PG 4 WC Physics, Condensed Matter SC Physics GA RR502 UT WOS:A1995RR50200015 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI COUPLING BETWEEN ELECTRONS AND ACOUSTIC PHONONS IN SEMICONDUCTOR NANOSTRUCTURES SO PHYSICAL REVIEW B LA English DT Article ID ENERGY RELAXATION; SCATTERING; SYSTEMS; WIRES AB We show that the coupling between electrons and acoustic phonons in semiconductor confined structures occurs via an interaction, which we call the ''ripple mechanism,'' in addition to the usual deformation potential coupling. Coupling due to the ripple mechanism arises from the perturbation of the electron wave function by the motion of interfaces. In this work we provide a general derivation of this coupling mechanism and give detailed expressions for it that are valid for all nanostructure systems, including those with quasi-zero-, one-, and two-dimensional geometries. For the purposes of illustration, calculations of the electron scattering rates due to acoustic phonons are given here for semiconductor quantum dots in a variety of shapes, including spheres, cubes, and rectangular parallelepipeds. From these results it is found that scattering due to the ripple mechanism dominates that from the deformation potential for dot sizes less than similar to 500 Angstrom and that for smaller dot sizes the ripple mechanism contribution can be much larger than that from the deformation potential. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KNIPP, PA (reprint author), CHRISTOPHER NEWPORT UNIV,DEPT PHYS & COMP SCI,NEWPORT NEWS,VA 23606, USA. NR 16 TC 45 Z9 45 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1995 VL 52 IS 8 BP 5923 EP 5928 DI 10.1103/PhysRevB.52.5923 PG 6 WC Physics, Condensed Matter SC Physics GA RR288 UT WOS:A1995RR28800071 ER PT J AU LI, Y LANGRETH, DC PEDERSON, MR AF LI, Y LANGRETH, DC PEDERSON, MR TI COPPER ADSORPTION POTENTIALS OF MGO(001) SO PHYSICAL REVIEW B LA English DT Article ID ENERGY-LOSS SPECTROSCOPY; ELECTRONIC-STRUCTURE; MAGNESIUM-OXIDE; IONIC-CRYSTALS; GROUND-STATE; MGO; SURFACE; MODEL; CU; INTERFACES AB The potentials of a copper atom as functions of position outside the MgO surface were evaluated ab initio. These all-electron calculations were carried out with a sufficiently complete localized basis set within the local-density approximation. The MgO(001) surface was simulated by the corresponding surface of finite clusters of various sizes; this procedure was found to give a reasonable approximation to the infinite surface. Potentials were evaluated as functions of distance for the configurations with the copper atom above a surface oxygen atom, a surface magnesium atom, and the hollow site halfway between two oxygen atoms. The deepest potential well was found to be the one for the copper atom above the surface oxygen atom. The mechanism for the bonding between the copper atom and the surface was found to be the interaction between the copper 4s state and the oxygen 2p band. C1 USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP RUTGERS STATE UNIV, DEPT PHYS & ASTRON, POB 849, PISCATAWAY, NJ 08855 USA. NR 47 TC 57 Z9 57 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1995 VL 52 IS 8 BP 6067 EP 6080 DI 10.1103/PhysRevB.52.6067 PG 14 WC Physics, Condensed Matter SC Physics GA RR288 UT WOS:A1995RR28800086 ER PT J AU ETIENNE, S DAVID, L MITOV, M SIXOU, P NGAI, KL AF ETIENNE, S DAVID, L MITOV, M SIXOU, P NGAI, KL TI MECHANICAL SPECTROSCOPY OF SIDE-CHAIN LIQUID-CRYSTALLINE POLYMERS IN THE GLASS-TRANSITION RANGE SO MACROMOLECULES LA English DT Article ID DIELECTRIC-RELAXATION; AMORPHOUS POLYMERS; VISCOELASTIC PROPERTIES; BEHAVIOR; DYNAMICS; POLYSILOXANES; DEPENDENCE AB We report the first low-frequency mechanical relaxation measurement of molecular motions at temperatures near glass transition in side-chain liquid crystalline polymers (SCLCP) with a short alkyl spacer length of 3 in the cholesteric state. The dynamics of molecular motions involved in the liquid-glass transition of side-chain liquid crystalline polymers in the cholesteric state has been studied. The effect of thermal history or physical aging has been investigated. The measured relaxation time when plotted against normalized reciprocal temperature in the metastable equilibrium state shows that the molecular motion exhibits a ''fragile'' or in other words a''highly cooperative'' character. The interpretation of experimental results through two compatible theoretical models suggests that the molecular motions involved in the glass transition are highly correlated in these SCLCPs. Comparison with the data of a similar SCLCP that has a long alkyl spacer length highlights the change in segmental dynamics with alkyl spacer length. In addition, the sensitivity of mechanical spectroscopy makes it possible to measure the variation of the glass transition temperature as a function of the chiral group amount. C1 INST NATL SCI APPL, ETUD MET PHYS & PHYS MAT GRP, CNRS, URA 341, F-69621 VILLEURBANNE, FRANCE. UNIV NICE, PHYS MAT CONDENSEE LAB, CNRS, URA 190, F-06108 NICE 2, FRANCE. USN, RES LAB, WASHINGTON, DC 20375 USA. RP ETIENNE, S (reprint author), ECOLE MINES, MET PHYS & SCI MAT LAB, CNRS, URA 155, PARC SAURUPT, F-54042 NANCY, FRANCE. NR 52 TC 17 Z9 17 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 14 PY 1995 VL 28 IS 17 BP 5758 EP 5764 DI 10.1021/ma00121a010 PG 7 WC Polymer Science SC Polymer Science GA RR095 UT WOS:A1995RR09500010 ER PT J AU KINZER, RL JOHNSON, WN DERMER, CD KURFESS, JD STRICKMAN, MS GROVE, JE KROEGER, RA GRABELSKY, DA PURCELL, WR ULMER, MP JUNG, GV MCNARONBROWN, K AF KINZER, RL JOHNSON, WN DERMER, CD KURFESS, JD STRICKMAN, MS GROVE, JE KROEGER, RA GRABELSKY, DA PURCELL, WR ULMER, MP JUNG, GV MCNARONBROWN, K TI OSSE OBSERVATIONS OF GAMMA-RAY EMISSION FROM CENTAURUS-A SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (NGC 5128); GAMMA RAYS, OBSERVATIONS; X-RAYS, GALAXIES ID ACTIVE GALACTIC NUCLEI; NON-THERMAL SOURCES; NONTHERMAL SOURCES; PAIR PRODUCTION; GALAXIES; VARIABILITY; RADIATION; ASTRONOMY; NGC-5128; BLAZARS AB Results are reported on hard X-ray and soft gamma-ray observations of Centaurus A during 1991-1994 with the Oriented Scintillation Spectrometer Experiment (OSSE) on NASA's Compton Gamma Ray Observatory (CGRO). Long-term intensity changes by a factor of 2-3 were measured over this period. Short-term variations by as much as 25% on timescales as short as 12 hr were detected in most of the observations. No evidence for gamma-ray line emission was detected at sensitivities much improved over previous observations. An intensity-dependent evolution of the 50-1000 keV spectral shape was observed which can be characterized as an exponentially cut-off power law with an intensity-dependent cutoff energy ranging from similar to 300 keV at the highest observed level to similar to 700 keV at the lowest levels. A broken power-law model with an intensity-correlated break above similar to 120 keV describes the observed spectral changes equally well. Best-fit spectral breaks vary from Delta T similar to 0.25 +/- 0.1 at the lowest levels to Delta T similar to 0.7 +/- 0.15 at the highest observed intensity. Below 120 keV the spectra at all intensities can be fitted with photon spectral index Gamma similar to 1.70 +/- 0.08, in agreement with prevous X-ray measurements. Contemporaneous measurements by the EGRET instrument on CGRO require additional spectral softening in the MeV region relative to broken power-law extrapolations of the OSSE measurements. At the maximum observed intensity, the luminosity of Cen A appears to peak at similar to 200 keV with L(gamma)(50-1000 keV) approximate to 7 x 10(42) ergs s(-1), implying a minimum black hole mass of only approximate to 5 x 10(4) solar masses for Eddington-limited accretion. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. GEORGE MASON UNIV,FAIRFAX,VA 22030. RP KINZER, RL (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. RI Johnson, Neil/G-3309-2014 NR 72 TC 50 Z9 50 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 10 PY 1995 VL 449 IS 1 BP 105 EP 118 DI 10.1086/176036 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA RM555 UT WOS:A1995RM55500012 ER PT J AU KROES, GJ MOWREY, RC AF KROES, GJ MOWREY, RC TI SCATTERING OF H-2 BY LIF(001) STUDIED USING A NEW MODEL POTENTIAL .1. PREDICTION OF LARGE DIFFERENCES IN DIFFRACTION OF COLD BEAMS OF PARA-H-2, AND NORMAL-H-2 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULE-SURFACE SCATTERING; DEPENDENT QUANTUM DYNAMICS; RANGE INTERACTION COEFFICIENTS; WAVE PACKET APPROACH; REACTIVE SCATTERING; DISPERSION COEFFICIENTS; ROTATIONAL TRANSITIONS; DIATOMIC MOLECULE; ATOMS; HE AB The close-coupling wave packet (CCWP)method has been used for performing calculations on rotationally and diffractionally inelastic scattering of H-2 from LiF(001), using a model potential. The scattering from the initial j = 0, 1, and 2 states was investigated at normal incidence for a collision energy of 0.1 eV. If the quadrupole-ionic lattice interaction is included in the potential model, large probabilities (up to 0.3) are obtained for reorientational (m(j) changing) transitions in the scattering from the initial j = 1 and j = 2 states. This is in contrast with results of previous theoretical work which used model potentials not including the electrostatic interaction and found much smaller probabilities for Delta m(j) transitions. Inclusion of the quadrupole-ionic lattice interaction in the model also leads to the prediction of large differences between the diffraction of H-2 in its j = O rotational state and diffraction of j = 1 H-2. It should be possible to check this result by diffraction experiments employing cold beams of para-H-2 and normal-H-2. In addition, the calculations show large differences between the diffraction of ''helicoptering'' H-2 (j = 1 or 2, \mj\ = j) and ''cartwheeling'' H, (j = 1 or 2, \mj\ = O). (C) 1995 American Institute of Physics. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP KROES, GJ (reprint author), FREE UNIV AMSTERDAM,DE BOELELAAN 1083,1081 HV AMSTERDAM,NETHERLANDS. NR 68 TC 31 Z9 31 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 8 PY 1995 VL 103 IS 6 BP 2186 EP 2201 DI 10.1063/1.469694 PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA RM539 UT WOS:A1995RM53900021 ER PT J AU MEYER, JR HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR AF MEYER, JR HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR TI TYPE-II QUANTUM-WELL LASERS FOR THE MIDWAVELENGTH INFRARED SO APPLIED PHYSICS LETTERS LA English DT Article AB We discuss an improved mid-wave infrared diode laser structure based on InAs-Ga1-xInxSb-InAs-Ga1-xAlxSb Type-II multiple quantum wells. The proposed design combines strong optical coupling, 2D dispersion for both electrons and holes, suppression of the Auger recombination rate, and excellent electrical and optical confinement. (C) 1995 American Institute of Physics. C1 WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP MEYER, JR (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. RI Ram-Mohan, Ramdas/C-5167-2012 NR 14 TC 317 Z9 319 U1 1 U2 30 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 7 PY 1995 VL 67 IS 6 BP 757 EP 759 DI 10.1063/1.115216 PG 3 WC Physics, Applied SC Physics GA RN017 UT WOS:A1995RN01700009 ER PT J AU FRIEDMAN, M FERNSLER, R SLINKER, S HUBBARD, R LAMPE, M AF FRIEDMAN, M FERNSLER, R SLINKER, S HUBBARD, R LAMPE, M TI EFFICIENT CONVERSION OF THE ENERGY OF INTENSE RELATIVISTIC ELECTRON-BEAMS INTO RF WAVES SO PHYSICAL REVIEW LETTERS LA English DT Article AB A novel relativistic klystron amplifier has achieved 50% energy efficiency, a significant advance over the previous state of the art of 20%. A radially converging structure that was inserted in the output gap reduced the potential energy residing in the electron beam and maximized rf output energy. Electrons that stopped inside the gap were intercepted by this structure and were shunted to ground. This is in contrast to classical klytons in which such electrons would have formed a virtual cathode and/or flow backward, regaining energy from the rf field. RP FRIEDMAN, M (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 9 TC 35 Z9 43 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 7 PY 1995 VL 75 IS 6 BP 1214 EP 1217 DI 10.1103/PhysRevLett.75.1214 PG 4 WC Physics, Multidisciplinary SC Physics GA RN001 UT WOS:A1995RN00100056 ER PT J AU WITKOWSKI, FX KAVANAGH, KM PENKOSKE, PA PLONSEY, R SPANO, ML DITTO, WL KAPLAN, DT AF WITKOWSKI, FX KAVANAGH, KM PENKOSKE, PA PLONSEY, R SPANO, ML DITTO, WL KAPLAN, DT TI EVIDENCE FOR DETERMINISM IN VENTRICULAR-FIBRILLATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID CONTROLLING CHAOS; SYSTEM AB Using a recently formulated technique for in vivo cardiac transmembrane current estimation, we examined ventricular fibrillation for evidence of deterministic linear and nonlinear structure. Both unstable fixed point analysis and a newly formulated measure of nonlinear determinism indicated that ventricular fibrillation in vivo exhibits deterministic dynamics similar to those previously used in chaos control. C1 DUKE UNIV, DEPT BIOMED ENGN, DURHAM, NC 27708 USA. USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. GEORGIA INST TECHNOL, SCH PHYS, ATLANTA, GA 30332 USA. MCGILL UNIV, DEPT PHYSIOL, MONTREAL, PQ H3G 2Y6, CANADA. RP WITKOWSKI, FX (reprint author), UNIV ALBERTA, EDMONTON, AB T6G 2R7, CANADA. RI Spano, Mark/B-6883-2011; OI Ditto, William/0000-0002-7416-8012 NR 21 TC 49 Z9 50 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 7 PY 1995 VL 75 IS 6 BP 1230 EP 1233 DI 10.1103/PhysRevLett.75.1230 PG 4 WC Physics, Multidisciplinary SC Physics GA RN001 UT WOS:A1995RN00100060 ER PT J AU PANDYA, KI RUSSELL, AE MCBREEN, J OGRADY, WE AF PANDYA, KI RUSSELL, AE MCBREEN, J OGRADY, WE TI EXAFS INVESTIGATIONS OF ZN(II) IN CONCENTRATED AQUEOUS HYDROXIDE SOLUTIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID X-RAY-ABSORPTION; FINE-STRUCTURE SPECTROSCOPY; SCATTERING; RAMAN; ORDER; IONS; XAFS AB The structure of the Zn2+ species in concentrated aqueous solutions of NaOH, KOH, RbOH, and CsOH was investigated with extended X-ray absorption fine structure (EXAFS) spectroscopy. The results show that the Zn2+ species exist in a tetrahedral configuration with a Zn-O bond distance of 1.96 +/- 0.01 Angstrom, independent of the cation of the hydroxide electrolyte. No evidence for higher Zn-H2O coordination shells, aggregation of the Zn(OH)(4)(2-) tetrahedra, or Zn-Zn interactions were found. The necessity of including the multiple-scattering contributions to obtain a complete and correct EXAFS analysis is clearly shown. C1 USN,RES LAB,WASHINGTON,DC 20375. N CAROLINA STATE UNIV,DEPT PHYS,RALEIGH,NC 27695. UNIV NEWCASTLE UPON TYNE,DEPT CHEM,NEWCASTLE TYNE NE1 7RU,TYNE & WEAR,ENGLAND. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RI Russell, Andrea/B-8114-2009; Russell, Andrea/A-9625-2012 NR 34 TC 16 Z9 16 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA PO BOX 57136, WASHINGTON, DC 20037-0136 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 3 PY 1995 VL 99 IS 31 BP 11967 EP 11973 DI 10.1021/j100031a026 PG 7 WC Chemistry, Physical SC Chemistry GA RM901 UT WOS:A1995RM90100026 ER PT J AU KARLE, J AF KARLE, J TI NEW APPROACHES TO STRUCTURE-ANALYSIS SO ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE LA English DT Article; Proceedings Paper CT Symposium on New Trends in Small Moiety Crystallography, at the 1994 ACA Meeting CY JUN 26-JUL 01, 1994 CL ATLANTA, GA SP Amer Crystallog Assoc ID KARLE-HAUPTMAN MATRICES AB There are relationships among the phases and magnitudes of the structure factors that have not been extensively studied regarding their potential for enhancing procedures for structure determination. These relationships arise from a special way of writing the determinantal inequalities that form the necessary and sufficient conditions for a Fourier series to be non-negative. This particular form also lends itself readily to the development of probability measures by the use of the central limit theorem. Higher-order determinants are of interest. The relationships among the phases and magnitudes of the structure factors are algebraic relationships and the focus is on those which retain their reliability, even though the magnitudes of the structure factors contain experimental errors. The future utility of the algebraic relationships depends upon the development of suitable algorithms for solving them to obtain values for the unknown phases. One approach concerns a method for extending the range of least-squares calculations by modifying the defining equations without changing the global minima and by further altering the nature of the minimization function from time to time during the course of the least-squares calculation, while still preserving the global minima. The objective is to smooth the minimization function and alter the remaining false minima from time to time so that the minimization function is not trapped in a false minimum. Some calculations have been made that indicate the nature of the algebraic relationships among the phases and magnitudes and how the results of the calculations are benefited by having large values for the structure-factor magnitudes in the determinants. It is also noted that large numbers of lower-order determinants can be spawned from one large order one. A possible virtue of this is that the structure factors which appear in the one large determinant appear with great redundance in the lower-order ones. A question to be answered is whether it is better to use many lower-order determinants for the algebraic equations or one larger determinant, or perhaps some combinations. There are very many alternatives to pursue and probably extensive experimentation will be needed to determine what is optimal. RP KARLE, J (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM30902] NR 14 TC 1 Z9 1 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7681 J9 ACTA CRYSTALLOGR B JI Acta Crystallogr. Sect. B-Struct. Commun. PD AUG 1 PY 1995 VL 51 BP 411 EP 415 DI 10.1107/S0108768195000024 PN 4 PG 5 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA RP961 UT WOS:A1995RP96100004 PM 7646837 ER PT J AU MAMMEN, L SCHMIDT, CP AF MAMMEN, L SCHMIDT, CP TI PHOTOSENSITIVITY REACTIONS - A CASE-REPORT INVOLVING NSAIDS SO AMERICAN FAMILY PHYSICIAN LA English DT Article AB Photosensitivity reactions associated with the use of prescription or over-the-counter drugs may be classified as phototoxic (caused by potentiation of solar energy by a drug) or photoallergic (in which the combination of a photosensitizing agent and light evokes a true cell-mediated hypersensitivity response). A case of a photoallergic response related to the use of piroxicam is included to illustrate the presentation and management of photosensitivity reactions to nonsteroidal anti-inflammatory drugs. C1 USN,MED CLIN,HONOLULU,HI 96860. NR 0 TC 7 Z9 7 U1 0 U2 0 PU AMER ACAD FAMILY PHYSICIANS PI KANSAS CITY PA 8880 WARD PARKWAY, KANSAS CITY, MO 64114-2797 SN 0002-838X J9 AM FAM PHYSICIAN JI Am. Fam. Physician PD AUG PY 1995 VL 52 IS 2 BP 575 EP 579 PG 5 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA RM676 UT WOS:A1995RM67600021 PM 7625330 ER PT J AU PACHUTA, SM MEIERS, JC AF PACHUTA, SM MEIERS, JC TI DENTIN SURFACE TREATMENTS AND GLASS-IONOMER MICROLEAKAGE SO AMERICAN JOURNAL OF DENTISTRY LA English DT Article ID MARGINAL LEAKAGE; SMEAR LAYER; CEMENT; ADHESION; ENAMEL; ACID AB Purpose: To investigate the effect of various dentin treatments on the microleakage of Class V restorations restored with a resin-modified glass ionomer restorative cement. Materials and Methods: Forty extracted noncarious molar teeth received Class V preparations with the occlusal margin in enamel and the gingival margin in dentin. Preparations were restored with Fuji II LC glass ionomer restorative material. Five dentin treatments were tested prior to restoration (n = 16): Group 1: without dentin pretreatment; Group 2: with GC Dentin Conditioner (10% polyacrylic acid solution); Group 3: with ProBond Dentin Primer; Group 4: with GC Dentin Conditioner and ProBond Dentin Primer; Group 5: with ProBond Dentin Primer followed by application of ProBond adhesive. Samples were thermocycled, stained with 0.5% basic fuchsin, and sectioned to evaluate microleakage. Data was analyzed using Kruskal-Wallis and Wilcoxon Signed-Rank Tests at a significance level of P < 0.05. SEM analysis was performed on selected samples to examine the dentin/glass ionomer interface. Results: There was no statistically significant difference between any of the dentin pretreatments with regard to enamel or dentin microleakage. SEM analysis indicated excellent adaptation between glass ionomer and dentin for all treatment groups. C1 USN,SCH DENT,RES DEPT,BETHESDA,MD 20889. USN,DENT RES INST DETACHMENT,BETHESDA,MD 20889. NR 17 TC 11 Z9 11 U1 0 U2 0 PU MOSHER & LINDER, INC PI SAN ANTONIO PA 9859 IH-10 WEST, SUITE 107/489, SAN ANTONIO, TX 78230-2236 SN 0894-8275 J9 AM J DENT JI Am. J. Dent. PD AUG PY 1995 VL 8 IS 4 BP 187 EP 190 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA RQ567 UT WOS:A1995RQ56700007 PM 7576385 ER PT J AU TURNER, EW GERMAIN, HAS MEIERS, JC AF TURNER, EW GERMAIN, HAS MEIERS, JC TI MICROLEAKAGE OF DENTIN-AMALGAM BONDING AGENTS SO AMERICAN JOURNAL OF DENTISTRY LA English DT Article ID MARGINAL MICROLEAKAGE; RESTORATIONS; INVITRO AB Purpose: To evaluate in vitro the microleakage of various dentin bond/resin liner systems when used with both a spherical and an admixture alloy. Materials and Methods: Class V cavity preparations were prepared on 60 noncarious extracted human molar teeth with one margin in enamel and another in dentin and restored with either Dispersalloy or Tytin alloy. Treatment groups utilizing either no liner, Copalite varnish, Amalgambond Plus/HPA, Tenure with Panavia EX Dental Adhesive, Syntac with Dual Gem, and All-Bond 2 with Liner F were tested. Samples were thermocycled, stained, and sectioned to evaluate microleakage. Results: A significant reduction in microleakage at the enamel and dentin margins was found in all dentin bond system/resin liner groups when compared to unlined and Copalite-lined alloys. There were no significant differences in total microleakage scores between the alloy types. Statistically significant differences in microleakage were detected between some systems. The Tenure with Panavia EX treatment group exhibited a significantly lower total microleakage when used with Tytin. The Syntac/Dual Cem treatment groups exhibited a significantly higher total microleakage when used with Dispersalloy. C1 USN,SCH DENT,RES DEPT,NATL NAVAL DENT CTR,BETHESDA,MD 20889. USN,SCH DENT,NATL NAVAL DENT CTR,DEPT COMPREHENS DENT,BETHESDA,MD 20889. USN,SCH DENT,NATL NAVAL DENT CTR,DEPT OPERAT DENT,BETHESDA,MD 20889. NR 19 TC 22 Z9 22 U1 0 U2 0 PU MOSHER & LINDER, INC PI SAN ANTONIO PA 9859 IH-10 WEST, SUITE 107/489, SAN ANTONIO, TX 78230-2236 SN 0894-8275 J9 AM J DENT JI Am. J. Dent. PD AUG PY 1995 VL 8 IS 4 BP 191 EP 196 PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA RQ567 UT WOS:A1995RQ56700008 PM 7576386 ER PT J AU SONENSHINE, DE RATZLAFF, RE TROYER, J DEMMERLE, S DEMMERLE, ER AUSTIN, WE TAN, S ANNIS, BA JENKINS, S AF SONENSHINE, DE RATZLAFF, RE TROYER, J DEMMERLE, S DEMMERLE, ER AUSTIN, WE TAN, S ANNIS, BA JENKINS, S TI BORRELIA-BURGDORFERI IN EASTERN VIRGINIA - COMPARISON BETWEEN A COASTAL AND INLAND LOCALITY SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID IXODES-DAMMINI ACARI; LIZARD SCELOPORUS-OCCIDENTALIS; WHITE-FOOTED MICE; LYME-DISEASE; PEROMYSCUS-LEUCOPUS; HUMAN BABESIOSIS; NEW-YORK; IXODIDAE; TICKS; RESERVOIRS AB In Virginia, Borrelia burgdorferi was more prevalent in a site along the Atlantic Ocean, near Maryland, than in an inland site near Williamsburg and Yorktown. At the coastal site on Assateague Island, B. burgdorferi was isolated from 4.2% of 475 animals sampled, including four species of small mammals. Serologic tests indicated that 25-37% of the small rodents assayed had been exposed to B. burgdorferi. Immunofluorescence antibody assays specific for B. burgdorferi showed spirochete infection in Ixodes scapularis and Dermacentor variabilis but not in other species of ticks also examined from this site. At another coastal site (Parramore Island), no evidence of Peromyscus leucopus was found, no immature specimens of I. scapularis were collected, and no isolations were made from numerous raccoons or small mammals sampled. Borrelia burgdoferi infection was found in one I. cookei nymph, but not in numerous specimens of I. scapularis or other tick species from this locality. At the inland site between Williamsburg and Yorktown, B. burgdoferi was isolated from two small mammal species and antibodies to B. burgdorferi were found in only 7-10% of the small mammals sampled. Ixodes scapularis were less abundant at this locality than at the Assateague Island site. Borrelia burgdoferi spirochetes were found in I. scapcularis and a single nymph of Amblyomma americanum, but not in any of numerous specimens of four other species. Infection with B. burgdorferi was found in 20% of unfed adult I. scapularis from vegetation, but in only 0.2% of numerous adults from hunter-killed deer. Infection in immature ticks was much lower than at Assateague Island. Borrelia burgdorferi may be more prevalent along the Atlantic coast than in inland areas. Isolations, seroprevalence, immature I. scapularis densities, and spirochete infection rates in ticks were higher at the Assateague Island site than the Williamsburg/Yorktown site. Consequently, the risk of human exposure to Lyme disease may be higher in some parts of the coastal area than elsewhere in Virginia. Overall, B. burgdorferi is less intense in Virginia than in the northeastern United States. C1 USN,ENVIRONM & PREVENT MED UNIT 2,NORFOLK,VA. VIRGINIA STATE HLTH DEPT,DIV EPIDEMIOL,RICHMOND,VA 23219. RP SONENSHINE, DE (reprint author), OLD DOMINION UNIV,DEPT BIOL SCI,NORFOLK,VA 23529, USA. FU PHS HHS [U50/CCU 306589-03-01] NR 35 TC 23 Z9 23 U1 0 U2 6 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD AUG PY 1995 VL 53 IS 2 BP 123 EP 133 PG 11 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA RV154 UT WOS:A1995RV15400003 PM 7677212 ER PT J AU MICHAEL, TS AF MICHAEL, TS TI THE RANKS OF TOURNAMENT MATRICES SO AMERICAN MATHEMATICAL MONTHLY LA English DT Note RP MICHAEL, TS (reprint author), USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU MATHEMATICAL ASSOC AMER PI WASHINGTON PA 1529 18TH STREET NW, WASHINGTON, DC 20036 SN 0002-9890 J9 AM MATH MON JI Am. Math. Mon. PD AUG-SEP PY 1995 VL 102 IS 7 BP 637 EP 639 DI 10.2307/2974562 PG 3 WC Mathematics SC Mathematics GA RT883 UT WOS:A1995RT88300011 ER EF