FN Thomson Reuters Web of Science™ VR 1.0 PT J AU STONE, RC AF STONE, RC TI CCD OBSERVATIONS LINKING THE RADIO AND OPTICAL REFERENCES FRAMES SO ASTRONOMICAL JOURNAL LA English DT Article ID MERIDIAN CIRCLE; ADDITIONAL RADIO; SOURCE POSITIONS; NORTHERN-HEMISPHERE; ASTROMETRY; STARS; CATALOG; FK5; HIPPARCOS; SYSTEM AB Observations made with the U.S. Naval Observatory 20 cm transit telescope are presented for 104 FK5 and 13 radio stars that are directly tied into the J2000 extragalactic reference system. A comparison of the star positions presented in this paper with the FK5 catalog finds possible warps in the FK5 reference system with amplitudes approximately 0.1 arcsec and rotations for linking the optical and radio reference systems with values omega(x) = -20 +/- 17 (s.e.), omega(y) = 28 +/- 16 (s.e.), and omega(z) = 11 +/- 13 (s.e.) mas. When the data of this paper are combined with other studies, these rotations become omega(x) = 11 +/- 13 (s.e.), omega(y) = 40 +/- 13 (s.e.), and omega(z) = 17 +/- 9 (s.e.) mas, indicating the omega(y) rotation might be real. Among the radio stars, there are four stars (KQ Pup, 54 Cam, SZ Psc, and HD 244085) with significant optical-radio offsets that exceed 0.15 arcsec in magnitude. Moreover, many other radio stars probably have appreciable offsets as determined from a statistical investigation. Optical-radio offsets which are typically accurate to sigma approximately +/-42 (s.e.) mas are also presented for 48 extragalactic objects observed with the transit telescope. Among these objects, 21% have significant offsets. Radio galaxies are much more likely to have large offsets than QSOs and BL Lac objects, making many of them poor candidates for radio reference objects. RP STONE, RC (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 52 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUL PY 1994 VL 108 IS 1 BP 313 EP 325 DI 10.1086/117071 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NT501 UT WOS:A1994NT50100032 ER PT J AU HUMMEL, CA MOZURKEWICH, D ELIAS, NM QUIRRENBACH, A BUSCHER, DF ARMSTRONG, JT JOHNSTON, KJ SIMON, RS HUTTER, DJ AF HUMMEL, CA MOZURKEWICH, D ELIAS, NM QUIRRENBACH, A BUSCHER, DF ARMSTRONG, JT JOHNSTON, KJ SIMON, RS HUTTER, DJ TI 4 YEARS OF ASTROMETRIC MEASUREMENTS WITH THE MARK-III OPTICAL INTERFEROMETER SO ASTRONOMICAL JOURNAL LA English DT Article ID STELLAR INTERFEROMETER; APPARENT AB Repeated measurements of the eleven FK5 stars selected by Shao et al. [AJ, 100, 1701 (1990)] were performed with the north-south and east-south astrometric baselines of the Mark III optical interferometer in order to estimate the accuracy of wide-angle astrometry. Even though the declination range of these stars is insufficient to determine absolute declinations, we were able to determine corrections to the FK5 positions at four epochs with an accuracy of about 13 milliarcseconds (mas) in declination and 23 mas in right ascension. Measurements at two different wavelengths were used to correct for refractive index fluctuations in the turbulent atmosphere. The pathlength difference between the two arms of the interferometer was monitored during the night with an internal white-light interferometer. The accuracy of the positions is limited by systematic errors due to unmonitored changes in the baseline coordinates and due to low-frequency water vapor fluctuations. However, these results demonstrate the potential of future optical interferometers for the measurement of stellar positions with mas accuracy. C1 USN OBSERV,NRL,USNO OPT INTERFEROMETER PROJECT,WASHINGTON,DC 20392. NR 16 TC 28 Z9 28 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUL PY 1994 VL 108 IS 1 BP 326 EP 336 DI 10.1086/117072 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NT501 UT WOS:A1994NT50100033 ER PT J AU ALTENHOFF, WJ JOHNSTON, KJ STUMPFF, P WEBSTER, WJ AF ALTENHOFF, WJ JOHNSTON, KJ STUMPFF, P WEBSTER, WJ TI MILLIMETER-WAVELENGTH OBSERVATIONS OF MINOR PLANETS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE RADIATION MECHANISMS, THERMAL; MINOR PLANETS, ASTEROIDS; PLANETS AND SATELLITES, INDIVIDUAL, MARS; RADIO CONTINUUM, SOLAR SYSTEM ID OCCULTATION; VESTA; SUBMILLIMETER; PALLAS; CERES AB Bolometer observations at 250 GHz of fifteen minor planets have shown that the emissivity of these objects is close to unity. This results in an independent method to determine the absolute calibration scale of radio observations at mm wavelengths: Applying our results to Mars, the prime calibrator at this wavelength, gives a mean absolute disk temperature at mean solar distance of almost-equal-to 210 K. Further, the diameters of circularly symmetric asteroids can be determined or the surface area of asteroids can be estimated assuming some geometric constraints on their shape. C1 USN OBSERV, WASHINGTON, DC 20392 USA. NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. RP ALTENHOFF, WJ (reprint author), MAX PLANCK INST RADIOASTRON, AUF HUGEL 69, D-53121 BONN, GERMANY. NR 26 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 JUL PY 1994 VL 287 IS 2 BP 641 EP 646 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NW311 UT WOS:A1994NW31100040 ER PT J AU KOLLGAARD, RI BRINKMANN, W CHESTER, MM FEIGELSON, ED HERTZ, P REICH, P WIELEBINSKI, R AF KOLLGAARD, RI BRINKMANN, W CHESTER, MM FEIGELSON, ED HERTZ, P REICH, P WIELEBINSKI, R TI A SENSITIVE 1.5 GHZ RADIO SURVEY AROUND THE NORTH ECLIPTIC POLE SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE CATALOGS; RADIO CONTINUUM, GENERAL; SURVEYS; X-RAYS, GENERAL ID MHZ SKY SURVEY; VLA SURVEY; OPTICAL POSITIONS; SOURCE CATALOG; GALAXIES; FIELD; EVOLUTION; CLUSTERS AB A 29.3 deg2 region surrounding the north ecliptic pole (NEP; alpha = 18 h00m, delta = +66-degrees 30') was mapped with the Very Large Array at 1.5 GHz to support the deepest portion of the ROSAT all-sky soft X-ray survey. The resulting VLA-NEP survey catalog contains 2435 radio sources with flux densities in the range of 0.3-1000 mJy, including over 200 fainter than 1 mJy. The 28 fields of the inner 1-degrees .5 have noise levels sigma almost-equal-to 60 muJy, and the 85 fields centered between 1-degrees .5 and 3-degrees .0 from the NEP have sigma almost-equal-to 120 muJy. The typical spatial resolution is 20'' HPBW, and most positions are accurate to <2''. Approximately 6% of the sources are found to be extended with size >30''. We have compared the VLA-NEP catalog with four other radio catalogs made at lower resolution, as well as with the NASA Extragalactic Database and find counterparts for approximately 18% of the VLA-NEP objects. The normalized, differential radio source count is in agreement with previous studies. Between 1 and 150 mJy the slope of the log N-log S relation is 0.68 +/- 0.03. The catalog and related tables are available electronically. C1 MAX PLANCK INST EXTRATERR PHYS,D-85740 GARCHING,GERMANY. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. MAX PLANCK INST RADIOASTRON,D-53121 BONN,GERMANY. RP KOLLGAARD, RI (reprint author), PENN STATE UNIV,DEPT ASTRON & ASTROPHYS,UNIV PK,PA 16802, USA. NR 50 TC 25 Z9 25 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD JUL PY 1994 VL 93 IS 1 BP 145 EP 159 DI 10.1086/192049 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NT961 UT WOS:A1994NT96100006 ER PT J AU SMITH, DR BASTIAANS, LM WEINBECK, RS PASSOW, MJ SMITH, PJ RYDELL, NN WARTHAN, HP SPANGLER, TC MACDONALD, AE AF SMITH, DR BASTIAANS, LM WEINBECK, RS PASSOW, MJ SMITH, PJ RYDELL, NN WARTHAN, HP SPANGLER, TC MACDONALD, AE TI MEETING REPORT ON THE 3RD AMS SYMPOSIUM ON EDUCATION SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Review AB In recognition of the educational efforts throughout the atmospheric and oceanic science communities, the American Meteorological Society (AMS) has instituted an annual forum called the Symposium on Education. The third such symposium was held this year in conjunction with the 74th Annual Meeting in Nashville, Tennessee. The theme of this year's symposium was ''Preparing for the Twenty-First Century.'' Thirty-one oral presentations and 26 poster presentations summarized a variety of educational programs or examined issues of importance for both the precollege and university levels. In addition, there was a panel discussion on future directions for the undergraduate degree in the atmospheric and marine sciences. One interesting aspect of this year's symposium was a joint session with the 10th International Conference on Interactive Information and Processing Systems for Meteorology, Oceanography, and Hydrology on new technologies for the classroom. Over 200 people representing a wide spectrum of the Society attended one or more of the sessions in this two-day conference, where they increased their awareness of the educational initiatives of members and institutions associated with the AMS. C1 SCH & POPULAR METEOROL & OCEANOG EDUC,BOSTON,MA. NASSAU COMMUNITY COLL,DEPT PHYS SCI,GARDEN CITY,NY 11530. SUNY COLL BROCKPORT,BROCKPORT,NY 14420. WHITE PLAINS MIDDLE SCH,WHITE PLAINS,NY. PURDUE UNIV,DEPT EARTH & ATMOSPHER SCI,W LAFAYETTE,IN 47907. NOAA,NATL WEATHER SERV OFF,SAN ANTONIO,TX. TOWERS HIGH SCH,DECATUR,GA. UNIV CORP ATMOSPHER RES,COMET,BOULDER,CO. NOAA,ENVIRONM RES LABS,FORECAST SYST LAB,BOULDER,CO 80303. RP SMITH, DR (reprint author), USN ACAD,DEPT OCEANOG,572 HOLLOWAY RD,ANNAPOLIS,MD 21402, USA. NR 2 TC 2 Z9 2 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 JUL PY 1994 VL 75 IS 7 BP 1241 EP 1247 PG 7 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NY828 UT WOS:A1994NY82800007 ER PT J AU MCCANN, MP SEMTNER, AJ CHERVIN, RM AF MCCANN, MP SEMTNER, AJ CHERVIN, RM TI TRANSPORTS AND BUDGETS OF VOLUME, HEAT, AND SALT FROM A GLOBAL EDDY-RESOLVING OCEAN MODEL SO CLIMATE DYNAMICS LA English DT Article ID EQUATORIAL PACIFIC-OCEAN; LAYER SALINITY BUDGET; WORLD OCEAN; ATLANTIC-OCEAN; INDIAN-OCEAN; CIRCULATION; WATER; FLUXES AB The results from an integration of a global ocean circulation model have been condensed into an analysis of the volume, heat, and salt transports among the major ocean basins. Transports are also broken down between the model's Ekman, thermocline, and deep layers. Overall, the model does well. Horizontal exchanges of mass, heat, and salt between ocean basins have reasonable values; and the volume of North Atlantic Deep Water (NADW) transport is in general agreement with what limited observations exist. On a global basis the zonally integrated meridional heat transport is poleward at all latitudes except for the latitude band 30-degrees-S to 45-degrees-S. This anomalous transport is most likely a signature of the model's inability to form Antarctic Intermediate (AAIW) and Antarctic bottom water (AABW) properly. Eddy heat transport is strong at the equator where its convergence heats the equatorial Pacific about twice as much as it heats the equatorial Atlantic. The greater heating in the Pacific suggests that mesoscale eddies may be a vital mechanism for warming and maintaining an upwelling portion of the global conveyor-belt circulation. The model's fresh water transport compares well with observations. However, in the Atlantic there is an excessive southward transport of fresh water due to the absence of the Mediterranean outflow and weak northward flow of AAIW. Eddies in the mid-latitudes act to redistribute heat and salt down the mean gradients. Residual fluxes calculated from a sum of the computed advective (including eddies), forced, and stored fluxes of heat and salt represent transport mostly due to vertical sub-grid scale mixing processes. Perhaps the model's greatest weakness is the lack of strong AAIW and AABW circulation cells. Accurate thermohaline forcing in the North Atlantic (based on numerous hydrographic observations) helps the model adequately produce NADW. In contrast, the southern ocean is an area of sparse observation. Better thermohaline observations in this area may be needed if models such as this are to produce the deep convection that will achieve more accurate simulations of the global 3-dimensional circulation. C1 USN,POSTGRAD SCH,CODE OC,MONTEREY,CA 93943. NATL CTR ATMOSPHER RES,BOULDER,CO 80307. RP MCCANN, MP (reprint author), USN,POSTGRAD SCH,CODE 51,MONTEREY,CA 93943, USA. NR 44 TC 19 Z9 19 U1 0 U2 5 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0930-7575 J9 CLIM DYNAM JI Clim. Dyn. PD JUL PY 1994 VL 10 IS 1-2 BP 59 EP 80 DI 10.1007/BF00210337 PG 22 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NX688 UT WOS:A1994NX68800005 ER PT J AU WALLACE, MR KANAK, RJ NEWTON, JA KENNEDY, CA AF WALLACE, MR KANAK, RJ NEWTON, JA KENNEDY, CA TI INVASIVE ASPERGILLOSIS IN PATIENTS WITH AIDS SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 USN,MED CTR,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92152. USN,MED CTR,DEPT INTERNAL MED,DIV PULM,SAN DIEGO,CA 92152. RP WALLACE, MR (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 2 TC 11 Z9 11 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 JUL PY 1994 VL 19 IS 1 BP 222 EP 222 PG 1 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA NX665 UT WOS:A1994NX66500053 PM 7948549 ER PT J AU GRAY, GC RODIER, GR AF GRAY, GC RODIER, GR TI PREVACCINATION SCREENING FOR CITIZENS OF THE UNITED-STATES LIVING ABROAD WHO ARE AT RISK FOR HEPATITIS-A SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 USN,MED RES UNIT 3,EPIDEMIOL BRANCH,CAIRO,EGYPT. UNIV MARYLAND,INT HLTH PROGRAM,BALTIMORE,MD 21201. NR 6 TC 3 Z9 3 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 JUL PY 1994 VL 19 IS 1 BP 225 EP 226 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA NX665 UT WOS:A1994NX66500056 PM 7948551 ER PT J AU MASON, RJ FRIEDMAN, SJ FRASSICA, FJ AF MASON, RJ FRIEDMAN, SJ FRASSICA, FJ TI MEDIAL MENISCAL CYST OF THE KNEE SIMULATING A SOLITARY BONE LESION - A CASE-REPORT AND REVIEW OF THE LITERATURE SO CLINICAL ORTHOPAEDICS AND RELATED RESEARCH LA English DT Review ID MANAGEMENT; DIAGNOSIS AB Meniscal cysts are common lesions, but extensive bony changes arising from these cysts are exceedingly rare. These changes are usually erosive defects about the tibia. Dull pain with an associated mass are classic findings. Magnetic resonance imaging is useful in making the diagnosis and arthroscopic management yields excellent results. A 47-year-old man developed a symptomatic medial meniscal cyst that invaded the medial femoral condyle simulating a solitary bone lesion. Magnetic resonance imaging revealed the contiguous nature of the cyst with the meniscus. Arthrotomy with cyst excision was required in this case and led to the amelioration of symptoms. C1 JOHNS HOPKINS UNIV,DEPT ORTHOPAED & ONCOL,BALTIMORE,MD. RP MASON, RJ (reprint author), USN,REG MED CTR,DEPT ORTHOPED SURG,620 JOHN PAUL JONES CIR,PORTSMOUTH,VA 23708, USA. NR 26 TC 9 Z9 9 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0009-921X J9 CLIN ORTHOP RELAT R JI Clin. Orthop. Rel. Res. PD JUL PY 1994 IS 304 BP 190 EP 194 PG 5 WC Orthopedics; Surgery SC Orthopedics; Surgery GA NX352 UT WOS:A1994NX35200029 PM 8020214 ER PT J AU COVEY, DC SAPEGA, AA AF COVEY, DC SAPEGA, AA TI ANATOMY AND FUNCTION OF THE POSTERIOR CRUCIATE LIGAMENT SO CLINICS IN SPORTS MEDICINE LA English DT Article RP COVEY, DC (reprint author), USN HOSP,DEPT ORTHOPAED SURG,BOONE RD,BREMERTON,WA 98312, USA. NR 0 TC 22 Z9 24 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0278-5919 J9 CLIN SPORT MED JI Clin. Sports Med. PD JUL PY 1994 VL 13 IS 3 BP 509 EP 518 PG 10 WC Sport Sciences SC Sport Sciences GA NY112 UT WOS:A1994NY11200002 PM 7954879 ER PT J AU WILLIAMS, BA FLEMING, JW AF WILLIAMS, BA FLEMING, JW TI COMPARATIVE SPECIES CONCENTRATIONS IN CH4/O2/AR FLAMES DOPED WITH N2O, NO, AND NO2 SO COMBUSTION AND FLAME LA English DT Article ID LASER-INDUCED FLUORESCENCE; DIAGNOSTICS; TORR AB Laser-induced fluorescence is used to monitor the relative concentrations of the species OH, CH, NH, CN, NCO, and NO in a 10-torr premixed stoichiometric methane/oxygen/argon flame dope with N2O, NO, and NO2 at 0.0086 mole fraction. The relative yields of combustion intermediates for equivalent mole fractions of the different dopants are measured, and comparisons are made with PREMIX calculations based on currently accepted reaction rates. This procedure allows the chemical pathways followed by the different dopants to be compared under nearly identical conditions. Comparison of radical concentrations between the NO- and N2O-doped flames shows that CN and NCO are underpredicted for the N2O-doped flame, while NO is overpredicted. Conversely, NH is underpredicted for the NO-doped flame. These findings suggest that reburn consumption of NO is roughly 50% higher than predicted by current models. Nevertheless, the fraction of NO that reacts with hydrocarbon radicals in the reburn reactions is found to be fairly minor (less-than-or-equal-to 20%). Under the present conditions, NO2 is rapidly converted to NO, leading to quantitatively similar behavior for these two dopants. C1 USN,RES LAB,DEPT CHEM,CODE 6111,WASHINGTON,DC 20375. RP WILLIAMS, BA (reprint author), USN,RES LAB,DEPT CHEM,CODE 6111,WASHINGTON,DC 20375, USA. NR 38 TC 51 Z9 51 U1 0 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD JUL PY 1994 VL 98 IS 1-2 BP 93 EP 106 DI 10.1016/0010-2180(94)90200-3 PG 14 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA NU722 UT WOS:A1994NU72200008 ER PT J AU PEDERSON, MR QUONG, AA BROUGHTON, JQ FELDMAN, JL AF PEDERSON, MR QUONG, AA BROUGHTON, JQ FELDMAN, JL TI FULLERENE MOLECULES AND TUBULES POLARIZABILITIES, VIBRATIONAL-MODES AND NANOCAPILLARITY SO COMPUTATIONAL MATERIALS SCIENCE LA English DT Proceedings Paper CT International Symposium on Theory of Atomic and Molecular Clusters CY JUN 13-18, 1993 CL LEER, GERMANY ID NONLINEAR OPTICAL-PROPERTIES; SIMULATIONS; C-60; C60 C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. NR 20 TC 13 Z9 13 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0256 J9 COMP MATER SCI JI Comput. Mater. Sci. PD JUL PY 1994 VL 2 IS 3-4 BP 536 EP 542 DI 10.1016/0927-0256(94)90084-1 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA PC714 UT WOS:A1994PC71400020 ER PT J AU ROSSBY, T FONTAINE, J CARTER, EC AF ROSSBY, T FONTAINE, J CARTER, EC TI THE F/H FLOAT - MEASURING STRETCHING VORTICITY DIRECTLY SO DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID GULF-STREAM MEANDERS; POTENTIAL VORTICITY; TEMPERATURE; TRANSPORT; PARCELS AB By changing the volume of an isopycnal float by a small, prescribed amount, one can force it to rise or sink to neighboring isopycnal surfaces. The pressure difference between these is a simple measurement of stratification, DELTArho/DELTAz. This technique is adapted to the RAFOS float technology to measure stretching vorticity changes along the trajectories of floats in Gulf Stream meanders. The measurement uncertainty of the depth of an isopycnal is only a few meters, but the uncertainty of the layer thickness estimate, when measured over about 200 m, is about 7 m due to differential advection of small scale density structure. This includes all periods between the 8 x day-1 sampling rate of the prototype float and 1 day. The records from two floats are discussed in detail. As the floats up- or downwell and are expelled from the Gulf Stream, order 10-20% changes in stretching vorticity are observed. Particularly along the cyclonic edge of the current the changes can be quite abrupt corresponding to 1-2 x 10(-6) s-1 horizontal divergences. The changes in curvature vorticity, estimated from the float trajectories, are, by and large, weaker and tend to evolve more gradually. On the assumption that potential vorticity is conserved, changes in shear can be estimated. For the two cases discussed, one shows suggestive similarity with what might be expected using a ''frozen field'' model of downstream velocity. The other retains strong negative shear after expulsion from the stream, which may be indicative of an anticyclonic circulation just south of a meander crest. C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. RP ROSSBY, T (reprint author), UNIV RHODE ISL,KINGSTON,RI 02881, USA. NR 21 TC 11 Z9 11 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0967-0637 J9 DEEP-SEA RES PT I JI Deep-Sea Res. Part I-Oceanogr. Res. Pap. PD JUL PY 1994 VL 41 IS 7 BP 975 EP 992 DI 10.1016/0967-0637(94)90014-0 PG 18 WC Oceanography SC Oceanography GA PA990 UT WOS:A1994PA99000002 ER PT J AU MUSHRUSH, GW BEAL, EJ PELLENBARG, RE HAZLETT, RN EATON, HR HARDY, DR AF MUSHRUSH, GW BEAL, EJ PELLENBARG, RE HAZLETT, RN EATON, HR HARDY, DR TI A MODEL STUDY OF THE THERMAL-DECOMPOSITION OF CUMENE HYDROPEROXIDE AND FUEL INSTABILITY REACTIONS SO ENERGY & FUELS LA English DT Article ID TERT-BUTYL HYDROPEROXIDE AB Reactions that lead to fuel instability can be closely linked to the presence of active oxygen species such as hydroperoxides. An increasing body of evidence links oxidation reactions and the increasing polarity caused by incorporation of heteroatoms into the sediment precursors that form insoluble macromolecular compounds. The active oxygen compounds present in fuels are alkyl and aromatic hydroperoxides. Cumene hydroperoxide represents a logical choice for an active oxygen compound that could be present in a middle distillate fuel. This paper reports on the reactions of cumene hydroperoxide in benzene solvent for a reaction temperature range of 130-170-degrees-C for a 30-min time period. The complete slate of products is presented along with a suggested mechanism to explain the observed products and the implications for fuel instability reactions. C1 GEORGE MASON UNIV, DEPT CHEM, FAIRFAX, VA 22030 USA. HUGHES ASSOCIATES, WHEATON, MD 20902 USA. RP MUSHRUSH, GW (reprint author), USN, RES LAB, NAVY TECHNOL CTR SAFETY & SURVIVABIL, CODE 6181, WASHINGTON, DC 20375 USA. NR 23 TC 6 Z9 7 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD JUL-AUG PY 1994 VL 8 IS 4 BP 851 EP 855 DI 10.1021/ef00046a006 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA NZ303 UT WOS:A1994NZ30300006 ER PT J AU WIZEL, B ROGERS, WO HOUGHTEN, RA LANAR, DE TINE, JA HOFFMAN, SL AF WIZEL, B ROGERS, WO HOUGHTEN, RA LANAR, DE TINE, JA HOFFMAN, SL TI INDUCTION OF MURINE CYTOTOXIC T-LYMPHOCYTES AGAINST PLASMODIUM-FALCIPARUM SPOROZOITE SURFACE PROTEIN-2 SO EUROPEAN JOURNAL OF IMMUNOLOGY LA English DT Article DE CYTOTOXIC T CELLS; MALARIA; PFSSP2 ID LIPOSOME-MEDIATED DELIVERY; CLASS-I MOLECULES; CIRCUMSPOROZOITE PROTEIN; VACCINIA VIRUS; SELF-PEPTIDES; ANTIGEN-PRESENTATION; PRESENTATION PATHWAY; MALARIA SPOROZOITES; CELLS RECOGNIZE; SOLUBLE-ANTIGEN AB Sporozoite surface protein 2 has been identified as a target of malaria vaccines designed to produce protective CD8(+) cytotoxic T lymphocytes (CTL) because mice immunized with mastocytoma cells expressing a fragment of Plasmodium yoelii sporozoite surface protein 2 (PySSP2) are protected against malaria by an immune response that requires CD8(+) CTL. To define CTL epitopes in the Plasmodium falciparum sporozoite surface protein 2 (PfSSP2), spleen cells (SC) from mice immunized with irradiated sporozoites (irr spz) were stimulated with synthetic peptides, and these effecters were tested for cytolytic activity against peptide-pulsed, major histocompatibility complex (MHC)-matched targets. Two peptides containing CTL epitopes, A6 (Pf SSP2 3D7 214-233) and BH1 (Pf SSP2 3D7 3-11) were identified in bulk cultures of SC from immune C57BL/6 mice, and by production of CTL lines. Immunization with recombinant vaccinia expressing the full length PfSSP2 induced antigen specific, MHC-restricted, CD8(+) T cell-dependent cytolytic activity against these two peptides. Finally CTL were induced by immunization with a bacteria-derived recombinant fragment of PfSSP2 (rPfSSP2) mixed with a liposomal formulation containing a cationic lipid (Lipofectin(R) Reagent, LPF). Induced CTL lysed target cells pulsed with peptide A6 or with LPF/rPfSSP2, but not targets pulsed with only rPfSSP2. These studies demonstrate that CTL specific to PfSSP2 are present in C57BL/6 mice and that immunization with purified rPfSSP2 delivered with LPF induces a cytotoxic T cell response. C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT IMMUNOL & INFECT DIS,BALTIMORE,MD. TORREY PINES INST MOLEC STUDIES,SAN DIEGO,CA. WALTER REED ARMY INST RES,DEPT IMMUNOL,WASHINGTON,DC. VIROGENET CORP,TROY,NY 12180. RI Lanar, David/B-3560-2011 NR 59 TC 24 Z9 24 U1 0 U2 0 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0014-2980 J9 EUR J IMMUNOL JI Eur. J. Immunol. PD JUL PY 1994 VL 24 IS 7 BP 1487 EP 1495 DI 10.1002/eji.1830240705 PG 9 WC Immunology SC Immunology GA NX261 UT WOS:A1994NX26100003 PM 7517870 ER PT J AU DUTTA, P JOSHI, Y FRANCHE, C AF DUTTA, P JOSHI, Y FRANCHE, C TI DETERMINATION OF GAS TUNGSTEN ARC-WELDING EFFICIENCIES SO EXPERIMENTAL THERMAL AND FLUID SCIENCE LA English DT Article DE WELDING; JOINING; PROCESS MODELING; MANUFACTURING; HEAT TRANSFER; PROCESS AUTOMATION AB A combined experimental/computational technique for the estimation of gas tungsten arc welding (GTAW) efficiencies under quasi-steady conditions is presented. The instantaneous measurements of the weld pool length ahead of and behind the electrode are obtained from digitized free surface images, using a pulsed laser vision system. Measurements of the width and depth of the pool are obtained from weld sections using optical microscopy. Based on these measurements of the actual fusion boundary created by weldpool convection and other effects, a three-dimensional model outside the molten zone in the solid material is used to determine welding efficiency. Measurements and calculations are performed for a range of power inputs and torch speeds for both grooved and ungrooved, high-yield strength steel samples. Computed efficiencies are compared with those available in the literature. C1 UNIV MARYLAND,DEPT MECH ENGN,COLLEGE PK,MD 20742. USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP DUTTA, P (reprint author), COLUMBIA UNIV,DEPT MECH ENGN,NEW YORK,NY 10027, USA. NR 17 TC 22 Z9 22 U1 2 U2 6 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0894-1777 J9 EXP THERM FLUID SCI JI Exp. Therm. Fluid Sci. PD JUL PY 1994 VL 9 IS 1 BP 80 EP 89 DI 10.1016/0894-1777(94)90011-6 PG 10 WC Thermodynamics; Engineering, Mechanical; Physics, Fluids & Plasmas SC Thermodynamics; Engineering; Physics GA PB783 UT WOS:A1994PB78300010 ER PT J AU MILES, MH BUSH, BF LAGOWSKI, JJ AF MILES, MH BUSH, BF LAGOWSKI, JJ TI ANOMALOUS EFFECTS INVOLVING EXCESS POWER, RADIATION, AND HELIUM PRODUCTION DURING D2O ELECTROLYSIS USING PALLADIUM CATHODES SO FUSION TECHNOLOGY LA English DT Article DE CALORIMETRY; DIFFUSION; GLASS ID COLD FUSION; DEUTERIUM; PD; TRITIUM; CELLS AB Previous experiments showed that eight electrolysis gas samples collected during episodes of excess power production in two identical cells contained measurable amounts of He-4 while six control samples gave no evidence for helium. However, the detection limit for helium could not be defined clearly. This study of helium diffusion into the Pyrex glass sample flasks establishes a minimum helium detection limit of 3 x 10(13) atom/500 ml (3 ppb) for these experiments. New D2O and H2O control experiments involving helium measurements of electrolysis gas samples collected in metal flasks support this conclusion. This places the He-4 production rate at 10(11) to 10(12) atom/s per watt of excess power, which is the correct magnitude for typical fusion reactions that yield helium as a product. Simultaneous evidence for excess power, helium production, and anomalous radiation was present in these experiments. Completely new experiments with more precise helium measurements are reported that again show simultaneous evidence for excess power, helium production, and anomalous radiation. C1 UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712. RP MILES, MH (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 22 TC 20 Z9 20 U1 0 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD JUL PY 1994 VL 25 IS 4 BP 478 EP 486 PG 9 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NT537 UT WOS:A1994NT53700012 ER PT J AU BARKATT, A SANG, JC THORPE, AN SENFTLE, FE TALMY, IG NORR, MK MAZER, JJ IZETT, G SIGURDSSON, H AF BARKATT, A SANG, JC THORPE, AN SENFTLE, FE TALMY, IG NORR, MK MAZER, JJ IZETT, G SIGURDSSON, H TI SURFACE ALTERATION AND PHYSICAL-PROPERTIES OF GLASS FROM THE CRETACEOUS-TERTIARY BOUNDARY SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID HAITI; IMPACT; TEKTITES AB The scalloped surface feature on Cretaceous-Tertiary boundary glass is often explained as being due to terrestrial aqueous leaching. Leaching of man-made glass results in a reduction in density of the glass. Also, Fe, because of its relative insolubility, is concentrated by the leaching process. Thus, the Haitian glass specimens which have been heavily altered should have a thin rim of less dense glass in which the Fe is concentrated compared to the core glass. The higher Fe concentration in the rim glass should cause it to have an enhanced Curie constant and a lower density compared to the unaltered glass. The magnetic Curie constant, density, and scanning electron microscopic studies were made on altered specimens of Haitian glass and also on specimens showing a minimum of alteration. The results show that the less altered samples have the highest density and the lowest Curie constant. The data substantiate the terrestrial hypothesis. C1 HOWARD UNIV,WASHINGTON,DC 20059. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910. ARGONNE NATL LAB,ARGONNE,IL 60439. US GEOL SURVEY,DENVER,CO 80225. UNIV RHODE ISL,GRAD SCH OCEANOG,NARRAGANSETT,RI 02882. RP BARKATT, A (reprint author), CATHOLIC UNIV AMER,WASHINGTON,DC 20064, USA. NR 10 TC 2 Z9 2 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD JUL PY 1994 VL 58 IS 13 BP 2889 EP 2891 DI 10.1016/0016-7037(94)90122-8 PG 3 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA NX237 UT WOS:A1994NX23700011 ER PT J AU KUO, EYT AF KUO, EYT TI THE PERTURBATION CHARACTERIZATION OF REVERBERATION FROM A WIND-GENERATED BUBBLY OCEAN SURFACE .1. THEORY AND A COMPARISON OF BACKSCATTERING STRENGTH PREDICTIONS WITH DATA SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID SEA-SURFACE; SCATTERING; MODEL; WAVES; CLOUDS; BOTTOM; WATER AB A joint surface roughness/volumetric perturbation scattering theory is utilized to characterize bubbly ocean surface reverberation. Backscattering strength predictions are shown to be consistent with observed reverberation phenomena such as critical wind speeds, excess levels due to volumetric scattering, and saturation. RP USN, CTR UNDERSEA WARFARE, NEW LONDON, CT 06320 USA. NR 33 TC 3 Z9 4 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0364-9059 EI 1558-1691 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1994 VL 19 IS 3 BP 368 EP 381 DI 10.1109/48.312913 PG 14 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA PG375 UT WOS:A1994PG37500003 ER PT J AU ZHANG, Q BROWN, DA REINHART, L MORSE, TF WANG, JQ XIAO, G AF ZHANG, Q BROWN, DA REINHART, L MORSE, TF WANG, JQ XIAO, G TI TUNING BRAGG WAVELENGTH BY WRITING GRATINGS ON PRESTRAINED FIBERS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID OPTICAL-FIBER; MASK AB Bragg gratings at a specific wavelength are made using an Excimer KrF laser and a phase mask. The wavelength can be varied for fine tuning and multiplexing applications by straining the optical fiber during UV illumination. When the strain is removed, the grating formed is at a smaller wavelength than that dictated by the phase mask for the unstrained fiber. This technique was demonstrated by writing two gratings located at the same point in the optical fiber. The transmission from the first grating was used as a means for in situ absolute wavelength tuning. The second grating made with approximately 0.2% axial strain was at 1534.54 nm. Once the grating was made, the strain was removed from the fiber leaving the second grating tuned to 1532.04 nm, a wavelength shift of 2.5 nm. C1 BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. USN,POSTGRAD SCH,MONTEREY,CA 93940. RP ZHANG, Q (reprint author), BROWN UNIV,DIV ENGN,LIGHTWAVE TECHNOL LAB,PROVIDENCE,RI 02912, USA. RI Xiao, Gang/G-5691-2011 NR 7 TC 29 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 JUL PY 1994 VL 6 IS 7 BP 839 EP 841 DI 10.1109/68.311472 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA PB477 UT WOS:A1994PB47700022 ER PT J AU PACE, PE TAYLOR, LL AF PACE, PE TAYLOR, LL TI FALSE ALARM ANALYSIS OF THE ENVELOPE DETECTION GO-CFAR PROCESSOR SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB The greatest of constant false alarm rate processor (GO CFAR) is a useful architecture for adaptively setting a radar detection threshold in the presence of clutter edges. The GO CFAR input is often the envelope detected in-phase (I) and quadrature (Q) channels of the baseband signal (x(e) = square-root I2 + Q2). This envelope detection can also be approximated using x = a max{Absolute value of I, Absolute value of Q} + b min {Absolute value of I, Absolute value of Q} which requires less complex hardware (a and b are simple multiplying coefficients). The envelope GO CFAR processor and several envelope approximation GO CFAR processors are compared in terms of the probability of false alarm (PFA) performance. Closed-form expressions which describe the PFA performance are given and their accuracy evaluated. It is shown that for all cases, the PFA is proportional to the number of reference cells n for small threshold multiplier T and inversely proportional to n for large T. A region of intersection occurs where the PFA is the same for two different values of n. For example, at T' = 1.68 in the Absolute value of I + Absolute value of Q GO CFAR (a = 1, b = 1) the PFA for n = 1 is equal to the optimal n = infinity fixed-threshold PFA (PFA = 0.112). C1 HUGHES MISSILE SYST CO,POMONA,CA 91769. RP PACE, PE (reprint author), NAVAL POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC-PC,MONTEREY,CA 93943, 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1994 VL 30 IS 3 BP 848 EP 864 DI 10.1109/7.303754 PG 17 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NV887 UT WOS:A1994NV88700019 ER PT J AU HOFFMAN, SA BLAIR, WD AF HOFFMAN, SA BLAIR, WD TI THE ALPHA-BETA-GAMMA TRACKING FILTER WITH A NOISY JERK AS THE MANEUVER MODEL - COMMENTS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter AB In [1], the optimal steady-state gains and associated error covariances for an alpha, beta, GAMMA filter with a piecewise constant jerk as a maneuver model are presented. While the results given in [1] are correct, the gains and error covariances can be found in a much simpler manner. The simplified expressions for the gains and the error covariances are given, along with the code for a simple program that computes the gains for a given tracking index. RP HOFFMAN, SA (reprint author), USN,CTR SURFACE WARFARE,DEPT SYST RES & TECHNOL,DAHLGREN,VA 22448, USA. NR 4 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1994 VL 30 IS 3 BP 925 EP 928 DI 10.1109/7.303763 PG 4 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NV887 UT WOS:A1994NV88700026 ER PT J AU BARSHALOM, Y KUMAR, A BLAIR, WD GROVES, GW AF BARSHALOM, Y KUMAR, A BLAIR, WD GROVES, GW TI TRACKING LOW ELEVATION TARGETS IN THE PRESENCE OF MULTIPATH PROPAGATION SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter AB A tracking algorithm based on a measurement model of the multipath propagation effects on the elevation angle measurements is presented. This algorithm does not depend on the specific signal processing and the prevailing environmental conditions. The results of simulations based on several scenarios are presented. The signal processing model used to generate the elevation measurements of a low-flying target with multipath effects is also described. This model incorporates a spherical Earth and finite target range in the geometry of reflection. The algorithm clearly indicates when the measurements are degraded, in which case it automatically increases the variance of the altitude estimate. C1 USN,CTR SURFACE WARFARE,DEPT SYST RES & TECHNOL,DAHLGREN,VA 22448. RP BARSHALOM, Y (reprint author), UNIV CONNECTICUT,DEPT ELECT & SYST ENGN,U157,STORRS,CT 06269, USA. NR 10 TC 24 Z9 27 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1994 VL 30 IS 3 BP 973 EP 979 DI 10.1109/7.303775 PG 7 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NV887 UT WOS:A1994NV88700039 ER PT J AU BREAKALL, JK YOUNG, JS HAGN, GH ADLER, RW FAUST, DL WERNER, DH AF BREAKALL, JK YOUNG, JS HAGN, GH ADLER, RW FAUST, DL WERNER, DH TI THE MODELING AND MEASUREMENT OF HF ANTENNA SKYWAVE RADIATION-PATTERNS IN IRREGULAR TERRAIN SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID INTEGRAL-EQUATION; EDGE-DIFFRACTION; PROPAGATION; PREDICTION; SURFACE; GTD AB The Method of Moments (MoM) was used in conjunction with the Geometric Theory of Diffraction (GTD) for predicting the elevation-plane radiation patterns of simple high-frequency (HF) vertical monopoles and horizontal dipoles situated in irregular terrain. The three-dimensional terrain was approximated by seven connected flat plates that were very wide relative to the largest wavelength of interest. The plate length along the terrain profile was the longest possible that still adequately followed the shape of the path on the azimuth of the elevation pattern of interest and no shorter than 1 wavelength at the lowest frequency of interest. The MoM model was used to determine the antenna currents under the assumption that the terrain was planar (i.e., locally flat) over the distance pertinent to establishing the input impedance. The currents thus derived were used as inputs to the GTD model to determine the gain versus elevation angle of the antennas for HF skywave when situated in the irregular terrain. The surface wave solution for groundwave was not included since this does not appreciably contribute any effect to the skywave far-field patterns at HF in this case. The model predictions were made using perfect electric conducting (PEC) plates and using thin plates made, of lossy dielectric material with the same conductivity and relative permittivity as measured for the soil. These computed results were compared with experimental elevation-plane pattern data obtained using a single-frequency helicopter-borne beacon transmitter towed on a long dielectric rope in the far field on a linear path directly over the antennas. The monopoles and dipoles were situated in front of, on top of, and behind a hill whose elevation above the flat surrounding terrain was about 45 m. The patterns of all of the antenna types and sitings exhibited diffraction effects caused by the irregular terrain, with the largest effects being observed at the highest measurement frequency (27 MHz). The results for the PEC plates and the lossy dielectric plates were essentially identical for the horizontal dipoles, whereas the lossy dielectric plates were required to properly match the measured results for the vertical monopoles. The gain of the antennas in irregular terrain and the gain of the same antennas situated in flat, open terrain differed by up to 20 dB at the lower elevation angles (eg., 3-degrees-5-degrees). This difference in gain is significant for most HF systems. C1 PENN STATE UNIV, COMMUN & SPACE SCI LAB, UNIVERSITY PK, PA 16802 USA. SRI INT, DIV INFORMAT TELECOMMUN & AUTOMAT, ARLINGTON, VA 22209 USA. USN, POSTGRAD SCH, DEPT ELECT & COMP ENGN, MONTEREY, CA 93943 USA. EYRING INC, DIV COMMUN SYST, PROVO, UT 84601 USA. PENN STATE UNIV, APPL RES LAB, STATE COLL, PA 16804 USA. RP BREAKALL, JK (reprint author), PENN STATE UNIV, DEPT ELECT ENGN, UNIVERSITY PK, PA 16802 USA. NR 48 TC 0 Z9 0 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-926X EI 1558-2221 J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD JUL PY 1994 VL 42 IS 7 BP 936 EP 945 DI 10.1109/8.299595 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA PA188 UT WOS:A1994PA18800006 ER PT J AU MARCHYWKA, M MOSES, D AF MARCHYWKA, M MOSES, D TI OPTICAL CHARACTERIZATION OF DIAMOND MIS CAPACITORS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article DE DIAMOND ELECTRONICS; MIS CAPACITOR; UV; VACUUM ULTRAVIOLET; PHOTODETECTORS ID ULTRAVIOLET; STABILITY; DETECTORS; DIODE AB The transient photoresponse properties of diamond metal-insulator-semiconductor (MIS) capacitors have been characterized for the first time. Capacitors were fabricated on natural diamond using an electrochemical cleaning step with a CVD SiO2 dielectric and an optional carbon implantation to create a nonuniform doping profile. Devices were found to function as integrating photodetectors and were evaluated bv the spectral dependence of the transient photocapacitance (PC). We discuss a model that distinguishes between the responses due to inversion layer population and that due to bulk trap occupancy changes. Inversion charge generation was observed at all wavelengths investigated and it dominated the PC transient at photon energies above 3 eV. Possible reasons for this result are discussed and analyzed. We could not demonstrate a suitable way to use carbon implantation to form a surface n-type layer in a MIS device without degrading the device IV properties and eliminating the integrating photoresponse observed on non-implanted devices. These results suggest that diamond charge-storage devices can function only if the diamond surface is prepared properly before device fabrication. C1 NASA,ESA,SOLAR & HELIOSPHER OBSERV PROGRAM,WASHINGTON,DC 20546. RP MARCHYWKA, M (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,SOLAR PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 31 TC 6 Z9 6 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 JUL PY 1994 VL 41 IS 7 BP 1265 EP 1272 DI 10.1109/16.293357 PG 8 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA NV886 UT WOS:A1994NV88600025 ER PT J AU VANDERPLAATS, NR KODIS, MA FREUND, HP AF VANDERPLAATS, NR KODIS, MA FREUND, HP TI DESIGN OF TRAVELING-WAVE TUBES BASED ON FIELD-THEORY SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB A method is described for the design of helix traveling wave tubes (TWT) which is based on the linear field analysis of the coupled beam-wave system. The dispersion relations are obtained by matching of radial admittances at boundaries instead of the individual field components. This approach provides flexibility in modeling various beam and circuit configurations with relative ease by choosing the appropriate admittance functions for each case. The method is illustrated for the case of a solid beam inside a sheath helix which is loaded externally by lossy dielectric material, a conducting cylinder, and axial vanes. Extension of the analysis to include a thin tape helix model is anticipated in the near future. The TWT model may be divided into axial regions to include velocity tapers, lossy materials and severs, with the helix geometry in each region varied arbitrarily. The relations between the ac velocities, current densities, and axial electric fields are used to derive a general expression for the new amplitudes of the three forward waves at each axial boundary. The sum of the fields for the three forward waves (two waves in a drift region) is followed to the circuit output. Numerical results of the field analysis are compared with the coupled-mode Pierce theory. A method is suggested for applying the field analysis to accurate design of practical TWT's that have a more complex circuit geometry, which starts with a simple measurement of the dispersion of the helix circuit. The field analysis may then be used to generate a circuit having properties very nearly equivalent to those of the actual circuit. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP VANDERPLAATS, NR (reprint author), USN,RES LAB,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 14 Z9 15 U1 1 U2 5 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 JUL PY 1994 VL 41 IS 7 BP 1288 EP 1296 DI 10.1109/16.293360 PG 9 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA NV886 UT WOS:A1994NV88600028 ER PT J AU KRISHNAMURTHY, S IYENGAR, SS HOLYER, RJ LYBANON, M AF KRISHNAMURTHY, S IYENGAR, SS HOLYER, RJ LYBANON, M TI HISTOGRAM-BASED MORPHOLOGICAL EDGE DETECTOR SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article ID OCEANOGRAPHIC IMAGES AB We present a new edge detector for automatic extraction of oceanographic (mesoscale) features present in infrared (IR) images obtained from the Advanced Very High Resolution Radiometer (AVHRR). Conventional edge detectors are very sensitive to edge fine structure, which makes it difficult to distinguish the weak gradients that are useful in this application from noise. Mathematical morphology has been used in the past to develop efficient and statistically robust edge detectors. Image analysis techniques use the histogram for operations such as thresholding and edge extraction in a local neighborhood in the image. An efficient computational framework is discussed for extraction of mesoscale features present in IR images. The technique presented here, the Histogram-Based Morphological Edge detector (HMED), extracts all the weak gradients, yet retains the edge sharpness in the image. We also present new morphological operations defined in the domain of the histogram of an image. We provide interesting experimental results from applying the HMED technique to oceanographic data in which certain features are known to have edge gradients of varying strength. C1 NAVAL RES LAB,REMOTE SENSING BRANCH,COMP SCI & PHYS SECT,BAY ST LOUIS,MS 39529. RP KRISHNAMURTHY, S (reprint author), LOUISIANA STATE UNIV,DEPT COMP SCI,ROBOT RES LAB,BATON ROUGE,LA 70803, USA. NR 24 TC 17 Z9 18 U1 2 U2 3 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 JUL PY 1994 VL 32 IS 4 BP 759 EP 767 DI 10.1109/36.298005 PG 9 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA PB219 UT WOS:A1994PB21900004 ER PT J AU VOCCIO, JP JOSHI, CH LINDBERG, JF AF VOCCIO, JP JOSHI, CH LINDBERG, JF TI APPLICATION OF HIGH-TEMPERATURE SUPERCONDUCTING WIRES TO MAGNETOSTRICTIVE TRANSDUCERS FOR UNDERWATER SONAR SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 13th International Congress on Magnet Technology CY SEP 20-24, 1993 CL VICTORIA CONF CTR, VICTORIA, CANADA SP UNIV VICTORIA, TRIUMF LAB HO VICTORIA CONF CTR AB Recently discovered cryogenic magnetostrictive materials show maximum strains greater than any room temperature materials. These cryogenic magnetostrictors can be combined with high-temperature superconducting (HTS) coils to create a sonar transducer with high efficiency and high acoustic power density. A prototype low-frequency (< 1000 Hz) magnetostrictive transducer is described. This transducer uses a terbium-dysprosium (TbDy) magnetostrictor rod with HTS coils cooled to 50 - 80 K using a single-stage cryocooler. The device is designed for operation at water depths of 100 m and is believed to be the first fully integrated prototype demonstration of HTS. C1 USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320. RP VOCCIO, JP (reprint author), AMER SUPERCONDUCTOR CORP,WESTBOROUGH,MA 01581, USA. NR 8 TC 2 Z9 7 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 JUL PY 1994 VL 30 IS 4 BP 1693 EP 1698 DI 10.1109/20.305582 PN 2 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA PA173 UT WOS:A1994PA17300027 ER PT J AU Rauscher, C AF Rauscher, Christen TI Efficient Design Methodology for Microwave Frequency Multiplexers Using Infinite-Array Prototype Circuits SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB Frequency multiplexers of the manifold type, in which individual channel filters connect to a main trunk line without the use of isolating directional circuit components, are noted for their compactness, achieved through controlled signal interactions among channel circuits. A major drawback often associated with manifold designs is the potentially large number of network variables that must be handled simultaneously. The new multiplexer design approach being presented utilizes infinite-array prototype circuits based on logarithmic-periodic principles which, in turn, allow a significant reduction in the simultaneous-variable count. The technique is not confined to manifold architectures and can accommodate both contiguous and noncontiguous channels with a wide variety of frequency band allocations. The versatility of the approach is illustrated by two experimental contiguous-band five-channel multiplexer circuits that operate at C- and X-band frequencies, with one circuit designed for equal fractional bandwidths of 20%, and the other for constant absolute bandwidths of 800 MHz. These examples are believed to represent the first practical and successful utilizations of logarithmic periodicity in microwave multiport network design. C1 USN, Res Lab, Div Elect Sci & Technol, Washington, DC 20375 USA. RP Rauscher, C (reprint author), USN, Res Lab, Div Elect Sci & Technol, Washington, DC 20375 USA. FU Office of Naval Technology FX This work was supported in part by the Office of Naval Technology. NR 4 TC 23 Z9 23 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 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JUL PY 1994 VL 42 IS 7 BP 1337 EP 1346 DI 10.1109/22.299727 PN 1-2 PG 10 WC Engineering, Electrical & Electronic SC Engineering GA V17GS UT WOS:000207926300008 ER PT J AU SHUKLA, SB AGRAWAL, DP AF SHUKLA, SB AGRAWAL, DP TI A FRAMEWORK FOR MAPPING PERIODIC REAL-TIME APPLICATIONS ON MULTICOMPUTERS SO IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS LA English DT Note DE INTERVAL SEQUENCING; MESSAGE-INTERVAL ASSIGNMENT; PATH ASSIGNMENT; PERIODIC REAL-TIME; SCHEDULED ROUTING; TASK-FLOW GRAPH ID PROCESSOR; SYSTEMS AB This short paper presents a framework for periodic execution of task-flow graphs that enables schedulability analysis of the communication requirements. The analysis performs the steps of segmenting messages, assigning the segments to specific links and time intervals, and ordering them within the intervals to generate node switching schedules that provide contention-free message routing at run-time. The analysis is also used to integrate task allocation with message routing using a contention-based objective function. Usefulness of the proposed scheme in ensuring guaranteed communication performance is demonstrated by an appropriate example. C1 N CAROLINA STATE UNIV,DEPT ELECT & COMP ENGN,RALEIGH,NC 27695. RP SHUKLA, SB (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC-SH,MONTEREY,CA 93943, USA. NR 17 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 1045-9219 J9 IEEE T PARALL DISTR JI IEEE Trans. Parallel Distrib. Syst. PD JUL PY 1994 VL 5 IS 7 BP 778 EP 784 DI 10.1109/71.296323 PG 7 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NT579 UT WOS:A1994NT57900011 ER PT J AU YANG, MCK LEE, JS AF YANG, MCK LEE, JS TI OBJECT IDENTIFICATION FROM MULTIPLE IMAGES BASED ON POINT MATCHING UNDER A GENERAL TRANSFORMATION SO IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE LA English DT Letter DE BAYES RULE; PATTERN RECOGNITION; POINT MATCHING; MULTIPLE IMAGE INFORMATION COMBINATION AB This work is motivated by ship identification from a sequence of ISAR images. Maximum likelihood classification, based on point matching, is formulated when the observed images are subject to missing points and phantoms. The 3-D to 2-D transformation is assumed to be known only in a certain parametric form. Proper weights, based on the noise levels for all images, are derived for the classification formula. The new formulation simplifies the computation of matching and makes its extension to object identification from multiple images feasible. Moreover, some theoretical properties of the identification procedure can now be investigated. Guidelines on which groups of objects are easier to distinguish are found from statistical theory followed by intuitive explanation. This method is then applied to ship identification with simulated ISAR images. C1 USN,RES LAB,WASHINGTON,DC 20375. RP YANG, MCK (reprint author), UNIV FLORIDA,DEPT STAT,225 GRIFFIN FLOYD HALL,GAINESVILLE,FL 32611, USA. NR 13 TC 4 Z9 4 U1 0 U2 1 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0162-8828 J9 IEEE T PATTERN ANAL JI IEEE Trans. Pattern Anal. Mach. Intell. PD JUL PY 1994 VL 16 IS 7 BP 751 EP 756 DI 10.1109/34.297958 PG 6 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NY134 UT WOS:A1994NY13400010 ER PT J AU KIRLIN, RL BRUGEL, H YING, C GROUTAGE, DF AF KIRLIN, RL BRUGEL, H YING, C GROUTAGE, DF TI MAXIMUM-LIKELIHOOD REAL PART OF COHERENCE BETWEEN 2 NOISY SENSOR OUTPUTS WITH ZERO-DELAY SIGNAL INPUTS SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Letter AB We seek, in particular at low signal-to-noise ratio, the coherence between the outputs of two sensors that receive a signal with zero time-of-arrival difference but whose outputs include additive independent noises. This situation arises when the spectrum of a source is being investigated in a laboratory situation. The coherence measure may be used as a detection statistic for power at any FFT or DFT frequency; it may also be used indirectly as a signal power estimator since it is a function of SNR, and noise power is known. Because of the zero delay difference, ideal complex coherence has a zero imaginary part, and direct estimation of the real part seems appropriate. The maximum likelihood estimator for this and the corresponding Cramer-Rao Bound are derived. Extensive simulations verify the derivations. The small-difference approximation to the maximum likelihood solution gives a significant improvement in efficiency. Both the maximum likelihood solution and its small-coherence approximation give computational advantages over the conventional coherence estimator. C1 USN,CTR SURFACE WARFARE,DIV CARDEROCK,DETACHMENT PUGET SOUND,BREMERTON,WA 98314. UNIV BRITISH COLUMBIA,DEPT ELECT ENGN,VANCOUVER V6T 1W5,BC,CANADA. RP KIRLIN, RL (reprint author), UNIV VICTORIA,DEPT ELECT & COMP ENGN,VICTORIA V8W 3P6,BC,CANADA. 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 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD JUL PY 1994 VL 42 IS 7 BP 1852 EP 1855 DI 10.1109/78.298297 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA NY133 UT WOS:A1994NY13300031 ER PT J AU BUSS, AH LAWRENCE, SR KROPP, DH AF BUSS, AH LAWRENCE, SR KROPP, DH TI VOLUME AND CAPACITY INTERACTION IN FACILITY DESIGN SO IIE TRANSACTIONS LA English DT Article AB This paper addresses the joint facilities design problem of determining both demand and capacity with stochastic demand arrivals and stochastic processing throughput. Using a simple M/M/1 queueing model of a profit maximizing firm, we link marketing and production decision variables by recognizing appropriate congestion costs, and show that coordinated decision-making provides results superior to making demand and capacity decisions sequentially. Sensitivity analysis indicates that the model is robust with respect to its assumptions and parameters. An example illustrates die approach and demonstrates the application of the model. C1 UNIV COLORADO,COLL BUSINESS ADM,BOULDER,CO 80309. WASHINGTON UNIV,JOHN M OLIN SCH BUSINESS,ST LOUIS,MO 63130. RP BUSS, AH (reprint author), USN,POSTGRAD SCH,OPERAT RES DEPT,MONTEREY,CA 93943, USA. NR 23 TC 18 Z9 21 U1 2 U2 3 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0740-817X J9 IIE TRANS JI IIE Trans. PD JUL PY 1994 VL 26 IS 4 BP 36 EP 49 DI 10.1080/07408179408966617 PG 14 WC Engineering, Industrial; Operations Research & Management Science SC Engineering; Operations Research & Management Science GA PA758 UT WOS:A1994PA75800003 ER PT J AU HOFFMAN, SL FRANKE, ED AF HOFFMAN, SL FRANKE, ED TI INDUCING PROTECTIVE IMMUNE-RESPONSES AGAINST THE SPOROZOITE AND LIVER STAGES OF PLASMODIUM SO IMMUNOLOGY LETTERS LA English DT Article; Proceedings Paper CT WHO Task Force Meeting on Mechanisms of Immunity to Malaria CY APR 24-25, 1993 CL MAX PLANCK INST IMMUNBIOL, FREIBURG, GERMANY SP WHO HO MAX PLANCK INST IMMUNBIOL DE MALARIA; PLASMODIUM; PREERYTHROCYTIC STAGE; SPOROZOITE; CIRCUMSPOROZOITE PROTEIN; SPOROZOITE SURFACE PROTEIN 2; LIVER-STAGE ANTIGEN; CYTOKINE; VACCINE ID FALCIPARUM CIRCUMSPOROZOITE PROTEIN; T-CELL CLONES; CYTOTOXIC LYMPHOCYTES-T; MALARIA HEPATIC STAGES; TUMOR-NECROSIS-FACTOR; GAMMA-INTERFERON; SURFACE PROTEIN-2; MONOCLONAL-ANTIBODIES; INHIBITORY ACTIVITY; MURINE MALARIA AB Work on vaccines against the pre-erythrocytic stages of the Plasmodium life cycle is based on the observation that immunization with irradiated sporozoites (IRR SPZ) is protective. Antibodies against several SPZ surface proteins can prevent SPZ from effectively invading hepatocytes; antibodies and cytolytic-T lymphocytes directed against at least 3 parasite proteins expressed in infected hepatocytes can kill infected hepatocytes; and cytokines can activate infected hepatocytes to kill the intracellular parasite. Work is in progress to identify additional pre-erythrocytic parasite targets and to develop methods for optimally inducing protective immunity against SPZ and infected hepatocytes. The goal is to construct a vaccine that protects by inducing antibody and cellular immune responses against multiple parasite proteins. RP HOFFMAN, SL (reprint author), USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889, USA. RI Villasante, Eileen/G-3602-2011 NR 78 TC 11 Z9 11 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2478 J9 IMMUNOL LETT JI Immunol. Lett. PD JUL PY 1994 VL 41 IS 2-3 BP 89 EP 94 DI 10.1016/0165-2478(94)90113-9 PG 6 WC Immunology SC Immunology GA PF422 UT WOS:A1994PF42200002 PM 8002054 ER PT J AU JUNE, CH BLUESTONE, JA NADLER, LM THOMPSON, CB AF JUNE, CH BLUESTONE, JA NADLER, LM THOMPSON, CB TI THE B7 AND CD28 RECEPTOR FAMILIES SO IMMUNOLOGY TODAY LA English DT Review ID T-CELL ACTIVATION; CTLA-4 COUNTER-RECEPTOR; IL-2 GENE-EXPRESSION; HUMAN LYMPHOCYTES-T; PROTEIN-KINASE-C; SIGNAL-TRANSDUCTION; PHOSPHATIDYLINOSITOL 3-KINASE; CYCLOSPORINE-A; MESSENGER-RNA; TYROSINE PHOSPHORYLATION AB Current evidence suggests that T-cell receptor (TCR) recognition of antigen bound to the major histocompatibility complex (Ag-MHC) is insufficient to lead to T-cell proliferation or effector function. For a helper T cell to produce sufficient interleukin 2 (IL-2) to allow autocrine-driven clonal expansion, there is a requirement for so-called 'co-stimulatory' or 'accessory' signals in addition to TCR ligation by Ag-MHC. The interaction of the CD28 receptor on T cells with B7 on antigen-presenting cells (APCs) supplies one such co-stimulatory signal. However, the recent discovery that CD28 and B7 are each members of larger gene families suggests that the regulation of co-stimulation is more complex than previously imagined. Here, Carl June and colleagues highlight recent advances in the understanding of the CD28 and B7 receptor families. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. UNIV CHICAGO,BEN MAY INST,DEPT PATHOL,COMM IMMUNOL,CHICAGO,IL 60637. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DIV HEMATOL,BOSTON,MA 02115. UNIV CHICAGO,HOWARD HUGHES MED INST,CHICAGO,IL 60637. UNIV CHICAGO,DEPT MED,CHICAGO,IL 60637. UNIV CHICAGO,DEPT MOLEC GENET & CELL BIOL,CHICAGO,IL 60637. RP JUNE, CH (reprint author), USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889, USA. NR 93 TC 1307 Z9 1340 U1 2 U2 29 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0167-5699 J9 IMMUNOL TODAY JI Immunol. Today PD JUL PY 1994 VL 15 IS 7 BP 321 EP 331 DI 10.1016/0167-5699(94)90080-9 PG 11 WC Immunology SC Immunology GA NV213 UT WOS:A1994NV21300007 PM 7522010 ER PT J AU KHUSMITH, S SEDEGAH, M HOFFMAN, SL AF KHUSMITH, S SEDEGAH, M HOFFMAN, SL TI COMPLETE PROTECTION AGAINST PLASMODIUM-YOELII BY ADOPTIVE TRANSFER OF A CD8+ CYTOTOXIC T-CELL CLONE RECOGNIZING SPOROZOITE SURFACE PROTEIN-2 SO INFECTION AND IMMUNITY LA English DT Article ID CIRCUMSPOROZOITE PROTEIN; MONOCLONAL-ANTIBODIES; GAMMA-INTERFERON; MALARIA SPOROZOITES; LYMPHOCYTES-T; FALCIPARUM; HEPATOCYTES; EPITOPE; ANTIGEN; VACCINE AB BALB/c mice immunized with irradiated Plasmodium yoelii sporozoites produce antibodies and cytotoxic T lymphocytes against the circumsporozoite protein and against a 140-kDa protein, sporozoite surface protein 2 (PySSP2). Approximately 50% of mice immunized with P815 cells transfected with the gene encoding PySSP2 are protected against malaria, and this protection is reversed by in vivo depletion of CD8(+) T cells. To determine if CD8(+) T cells against PySSP2 are adequate to protect against malaria in the absence of other malaria-specific immune responses, we produced three CD8 T-cell clones by stimulating spleen cells from mice immunized with irradiated P. yoelii sporozoites with a mitomycin-treated P815 cell clone transfected with the PySSP2 gene. Adoptive transfer of done TSLB7 protected 100% of mice against P. yoelii, The second clone protected 58% of mice, and the third clone provided no protection. Clone TSLB7 protected even when administered 3 h after sporozoite inoculation at a time when sporozoites had entered hepatocytes, suggesting that it is recognizing and eliminating infected hepatocytes. These studies demonstrate that cytotoxic T lymphocytes against PySSP2 can protect against P. yoelii sporozoite challenge in the absence of other parasite-specific immune responses. C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. PAN AMER HLTH ORG,WASHINGTON,DC 20037. NR 32 TC 77 Z9 77 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 JUL PY 1994 VL 62 IS 7 BP 2979 EP 2983 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA NU014 UT WOS:A1994NU01400043 PM 8005684 ER PT J AU CLARK, GJ WU, CT AF CLARK, GJ WU, CT TI DFQL - DATA-FLOW QUERY LANGUAGE FOR RELATIONAL DATABASES SO INFORMATION & MANAGEMENT LA English DT Article DE RELATIONAL ALGEBRA; QUERY LANGUAGES; SQL; VISUAL INTERFACE; DATA-FLOW DIAGRAM; DBMS ID BY-EXAMPLE; SQL AB This paper proposes a new query language, DFQL, which has been designed to mitigate SQL's ease-of-use problems. DFQL provides a graphical interface based on the dataflow paradigm in order to allow a user to construct queries easily and incrementally for a relational database. DFQL is relationally complete, maintains relational operational closure, and is designed to be easily extensible by the end user. A prototype DFQL system has been implemented. C1 USN,POSTGRAD SCH,DEPT COMP SCI,CODE CS,MONTEREY,CA 93943. NR 31 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-7206 J9 INFORM MANAGE JI Inf. Manage. PD JUL PY 1994 VL 27 IS 1 BP 1 EP 15 DI 10.1016/0378-7206(94)90098-1 PG 15 WC Computer Science, Information Systems; Information Science & Library Science; Management SC Computer Science; Information Science & Library Science; Business & Economics GA NX624 UT WOS:A1994NX62400001 ER PT J AU TOPALIAN, SL RIVOLTINI, L MANCINI, M NG, J HARTZMAN, RJ ROSENBERG, SA AF TOPALIAN, SL RIVOLTINI, L MANCINI, M NG, J HARTZMAN, RJ ROSENBERG, SA TI MELANOMA-SPECIFIC CD4+ T-LYMPHOCYTES RECOGNIZE HUMAN-MELANOMA ANTIGENS PROCESSED AND PRESENTED BY EPSTEIN-BARR VIRUS-TRANSFORMED B-CELLS SO INTERNATIONAL JOURNAL OF CANCER LA English DT Article ID TUMOR-INFILTRATING LYMPHOCYTES; COLONY-STIMULATING FACTOR; NECROSIS-FACTOR-ALPHA; AUTOLOGOUS TUMOR; CYTOKINE SECRETION; LYMPH-NODES; INVIVO; RESPONSES; RELEASE; ALLELES AB While much emphasis has been placed on the role of MHC class I-restricted CD8(+) T cells in the recognition of tumor-specific antigens (Ag), evidence has accumulated that CD4(+) T cells also play a critical role in the anti-tumor immune response. However, little information exists on the nature of MHC class II-restricted human tumor Ag. In an attempt to develop in vitro systems to characterized such Ag, we examined the ability of Epstein-Barr virus(EBV)-transformed B cells to present melanoma-associated Ag to melanoma-specific CD4(+) cells. CD4(+) T cells cultured from lymphocytes infiltrating a s.c. melanoma metastasis secreted TNF-alpha and GM-CSF specifically in response to autologous cultured melanoma cells expressing MHC class II molecules. These CD4(+) cells also recognized MHC class II-compatible EBV-B cells pulsed with extracts of autologous melanoma cells, but failed to recognize EBV-B cells pulsed with autologous non-transformed cells or a variety of allogeneic tumors normal cells. B cells pre-fixed with paraformaldehyde were incapable of Ag presentation, suggesting that intracellular processing events were occurring. Antibody-blocking studies defined HLA-DR as the dominant if not exclusive restriction locus in this T-B interaction, and HLA-DR genotyping revealed DRBI *0404 to be the probable restriction element. In a second patient, CD4(+) T-cell clone cultured from a melanoma lesion recognized autologous tumor Ag presented by autologous EBV-B; no cross-reactivity was observed with the other tumor system investigated, nor with autologous CD4(+) T cells specific for tetanus toxoid. These findings demonstrate that tumor Ag can be processed and presented by EBV-transformed B cells to MHC class II-restricted tumor-specific CD4(+) T cells. They also provide a model system for direct identification of these tumor-derived antigens. (C) 1994 Wiley-Liss, Inc.* C1 USN,MED RES INST,CW BILL YOUNG MARROW DONOR RECRUITMENT & RES PROG,BETHESDA,MD 20889. RP TOPALIAN, SL (reprint author), NCI,DIV CANC TREATMENT,SURG BRANCH,BLDG 10,ROOM 2B47,BETHESDA,MD 20892, USA. OI Rivoltini, Licia/0000-0002-2409-6225 NR 28 TC 78 Z9 78 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 0020-7136 J9 INT J CANCER JI Int. J. Cancer PD JUL 1 PY 1994 VL 58 IS 1 BP 69 EP 79 DI 10.1002/ijc.2910580113 PG 11 WC Oncology SC Oncology GA NU741 UT WOS:A1994NU74100012 PM 7516926 ER PT J AU RAOUF, RA PALAZOTTO, AN AF RAOUF, RA PALAZOTTO, AN TI ON THE NONLINEAR FREE-VIBRATIONS OF CURVED ORTHOTROPIC PANELS SO INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS LA English DT Article ID SHELL PANELS AB This paper studies the non-linear free vibrations of simply supported curved orthotropic panels. The panels are modeled using the Donnell-Mushtari-Vlasov shell relationships. A combination of the Galerkin procedure and the Lindstedt-Poincare perturbation technique is used to construct an approximate solution to the resulting non-linear equations of motion. Algebraic manipulations show that the panel exhibits a non-linear response only when both the involved axial and circumferential modes are axisymmetric. Numerical studies of a Graphite/Epoxy panel show that its response is softening, i.e. the non-linear natural frequency decreases as the amplitude of motion increases. They also show that the lower modes are more non-linear than the higher, mainly flexural modes. The presented results also show that for the studied panels, the non-linear effects are the strongest for shallow, thin, and short panels. C1 USAF,INST TECHNOL,DEPT AERONAUT & ASTRONAUT,WRIGHT PATTERSON AFB,OH 45433. RP RAOUF, RA (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 15 TC 16 Z9 16 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 JUL PY 1994 VL 29 IS 4 BP 507 EP 514 DI 10.1016/0020-7462(94)90019-1 PG 8 WC Mechanics SC Mechanics GA PA061 UT WOS:A1994PA06100005 ER PT J AU JOHNSTONE, PA WEXLER, LH VENZON, DJ JACOBSON, J YANG, JC HOROWITZ, ME DELANEY, TF AF JOHNSTONE, PA WEXLER, LH VENZON, DJ JACOBSON, J YANG, JC HOROWITZ, ME DELANEY, TF TI SARCOMAS OF THE HAND AND FOOT - ANALYSIS OF LOCAL-CONTROL AND FUNCTIONAL RESULT WITH COMBINED-MODALITY THERAPY IN EXTREMITY PRESERVATION SO INTERNATIONAL JOURNAL OF RADIATION ONCOLOGY BIOLOGY PHYSICS LA English DT Article DE SARCOMA; HAND; FOOT; RADIATION THERAPY; COMBINED MODALITY THERAPY; LIMB PRESERVATION ID SOFT-TISSUE SARCOMAS; EWINGS-SARCOMA; RADIATION-THERAPY; RHABDOMYOSARCOMA; CHEMOTHERAPY; RADIOTHERAPY; INTERGROUP; MANAGEMENT; SURGERY; WRIST AB Purpose: The records of 28 patients with sarcomas of the hand and foot treated at the National Cancer Institute (NCI) between 1977 and 1992 were reviewed to assess local control and functional results. Methods and Materials: Histologic types included 15 cases of the Ewing's sarcoma family of tumors, 7 cases of alveolar rhabdomyosarcoma, and 6 cases of nonrhabdomyosarcoma soft tissue sarcomas. Median age of all patients was 18 years (range 4-61), with a median potential follow-up of 114 months following diagnosis. Surgery varied from incisional biopsies for Ewing's Sarcoma and rhabdomyosarcoma lesions to complete excision when possible for nonrhabdomyosarcoma soft tissue sarcoma lesions. Amputation was not primarily performed, except in two patients who underwent ray resections of hand lesions (patients 13 and 24). Radiotherapy generally consisted of 50 Gy/25 fractions (fx)/5 weeks for Ewing's Sarcoma, 54 Gy/30 fx/6 weeks for rhabdomyosarcoma, and 63 Gy/35 fx/7 weeks for nonrhabdomyosarcoma soft tissue sarcomas. Chemotherapy was administered on various NCI protocols. Results: Actuarial local control for Ewing's Sarcoma was 84% at 5 and 10 years. All but one survivor are capable of hand/foot function for routine activities without orthotic requirements. Five of six patients (83%) who died of metastatic disease had functional distal extremities. Actuarial local control for rhabdomyosarcomas was 100% at 5 years, with similar function. Three patients (60%) died of distant disease progression with functional distal extremities. Five-year actuarial local control for nonrhabdomyosarcoma soft tissue sarcomas was 100%, with equivalent function. No patient developed a second malignancy in the treatment field. Conclusions: Although equivalent local control may be achieved in these lesions with either amputation or radiotherapy, a prudent management course would be to defer amputation for management of local recurrences. Many patients with these lesions fail in distant sites only and die without local failure. For these patients and for those who remain long-term survivors, we believe a functional hand and foot provides a better quality of life than a prosthesis. C1 NCI,RADIAT ONCOL BRANCH,BETHESDA,MD 20892. NCI,PEDIAT BRANCH,BETHESDA,MD 20892. NCI,SURG BRANCH,BETHESDA,MD 20892. NCI,BIOSTAT & DATA MANAGEMENT SECT,BETHESDA,MD 20892. RP JOHNSTONE, PA (reprint author), USN,MED CTR,DIV RADIAT ONCOL,SAN DIEGO,CA 92134, USA. RI Venzon, David/B-3078-2008 NR 17 TC 27 Z9 29 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-3016 J9 INT J RADIAT ONCOL JI Int. J. Radiat. Oncol. Biol. Phys. PD JUL 1 PY 1994 VL 29 IS 4 BP 735 EP 745 PG 11 WC Oncology; Radiology, Nuclear Medicine & Medical Imaging SC Oncology; Radiology, Nuclear Medicine & Medical Imaging GA NZ482 UT WOS:A1994NZ48200013 PM 8040019 ER PT J AU MERRILL, L AF MERRILL, L TI CALM DOWN - A GUIDE FOR STRESS AND TENSION CONTROL - MCGUIGAN,FJ SO INTERNATIONAL JOURNAL OF STRESS MANAGEMENT LA English DT Book Review RP MERRILL, L (reprint author), USN,HLTH RES CTR,SAN DIEGO,CA 92152, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU HUMAN SCI PRESS INC PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013-1578 SN 1072-5245 J9 INT J STRESS MANAGE JI Int. J. Stress Manage. PD JUL PY 1994 VL 1 IS 3 BP 277 EP 278 DI 10.1007/BF01857994 PG 2 WC Psychology, Applied SC Psychology GA PW863 UT WOS:A1994PW86300007 ER PT J AU HOWARD, RM OLEARY, JF AF HOWARD, RM OLEARY, JF TI FLOWFIELD STUDY OF A CLOSE-COUPLED CANARD CONFIGURATION SO JOURNAL OF AIRCRAFT LA English DT Article AB A wind-tunnel study was completed examining the flowfield behavior of the canard-vortex/wing-vortex interaction for a close-coupled canard configuration in the post-stall regime. Three cross-planes were mapped in the lee flowfield using a five-hole pressure probe. The mappings traced the canard and wing vortices as they moved downstream, and gave clear evidence that the canard vortex provided the mechanism for flow reattachment over the inboard wing section. The previously separated flow became a coherent wing leading-edge vortex under the canard vortex influence. A tertiary vortex at the canard-fuselage juncture was revealed; this vortex may have an impact upon the resulting flow, and would not be evident in studies of bodiless wings with canards. Surface flow visualization aided in revealing the effects of the post-stall behavior. RP HOWARD, RM (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,CODE AAHO,MONTEREY,CA 93940, USA. NR 0 TC 11 Z9 15 U1 0 U2 3 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 JUL-AUG PY 1994 VL 31 IS 4 BP 908 EP 914 DI 10.2514/3.46578 PG 7 WC Engineering, Aerospace SC Engineering GA PA474 UT WOS:A1994PA47400024 ER PT J AU HAAS, DJ IMBER, R AF HAAS, DJ IMBER, R TI IDENTIFICATION OF HELICOPTER COMPONENT LOADS USING MULTIPLE-REGRESSION SO JOURNAL OF AIRCRAFT LA English DT Article AB Multiple regression analysis of helicopter flight data is used to develop prediction models for rotating system component loads from parameters measured in the fixed system. The data base that is analyzed contains load measurements for a helicopter performing several types of flight maneuvers, including symmetric pullouts, rolling pullouts, climbing turns, and level flight. The data are divided into two parts: one for model development and one to serve as a blind test of the model. For steady level flight, linear and nonlinear regression analyses are performed to predict main rotor pushrod and blade normal bending vibratory loads. Correlations above 95% were achieved on the test data for the steady level flight condition. For comparison, analytical results calculated using the CAMRAD/JA rotor analysis computer code for the helicopter in level flight are included. Regression models to predict vibratory loads during maneuvering flight are also developed. Evaluations on the test data indicate that correlations ranging from 79 to 95% are possible for the types of maneuvers contained in the data base. RP HAAS, DJ (reprint author), USN,SEA BASED AVIAT OFF,DAVID TAYLOR MODEL BASIN,BETHESDA,MD 20084, USA. NR 0 TC 4 Z9 4 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 JUL-AUG PY 1994 VL 31 IS 4 BP 929 EP 935 DI 10.2514/3.46581 PG 7 WC Engineering, Aerospace SC Engineering GA PA474 UT WOS:A1994PA47400027 ER PT J AU HEBBAR, SK PLATZER, MF KIM, CH AF HEBBAR, SK PLATZER, MF KIM, CH TI EXPERIMENTAL INVESTIGATION OF VORTEX BREAKDOWN OVER A SIDESLIPPING CANARD-CONFIGURED AIRCRAFT MODEL SO JOURNAL OF AIRCRAFT LA English DT Note RP HEBBAR, SK (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93940, USA. NR 0 TC 3 Z9 3 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD JUL-AUG PY 1994 VL 31 IS 4 BP 998 EP 1001 DI 10.2514/3.46598 PG 4 WC Engineering, Aerospace SC Engineering GA PA474 UT WOS:A1994PA47400044 ER PT J AU SEAVER, M BARRETT, A AF SEAVER, M BARRETT, A TI GAS SCAVENGING OF SOLUBLE AND INSOLUBLE ORGANIC VAPORS BY LEVITATED WATER DROPS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID WIND-TUNNEL AB Three-millimeter-diameter drops of water were levitated with a standing acoustic wave centered in the jet of a small wind tunnel and the volume changes as the drop evaporates in the presence of 1-propanol vapor were measured. The results are compared with a steady-state continuum evaporation model based on nonideal solution theory. Because the thermodynamic parameters for the 1-propanol-water system are well known, this system provides a test for our model. Good overall agreement between model and experimental results means that small discrepancies can be used to establish limits for dynamic effects. An immiscible liquids version of this model, which accounts for gas scavenging of methyl salicylate, is used to predict the amount of insoluble material scavenged by a drop of water evaporating to dryness. This model predicts that the volume of organic liquid left behind increases slightly as the relative humidity approaches 100%. C1 USN,RES LAB,SCI & ENGN APPRENTICE PROGRAM,WASHINGTON,DC 20375. RP SEAVER, M (reprint author), USN,RES LAB,CODE 5610,WASHINGTON,DC 20375, USA. NR 13 TC 0 Z9 0 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD JUL PY 1994 VL 33 IS 7 BP 808 EP 812 DI 10.1175/1520-0450(1994)033<0808:GSOSAI>2.0.CO;2 PG 5 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NT669 UT WOS:A1994NT66900006 ER PT J AU XIE, H WANG, WI MEYER, JR AF XIE, H WANG, WI MEYER, JR TI INFRARED ELECTROABSORPTION MODULATION AT NORMAL INCIDENCE IN ASYMMETRICALLY STEPPED ALSB/INAS/GASB/ALSB QUANTUM-WELLS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DIRECT-INDIRECT TRANSITIONS; VALENCE-BAND DISCONTINUITY; INTERSUBBAND ABSORPTION; SUPERLATTICES; DETECTORS; FIELD AB A normal-incidence modulation mechanism is proposed which uses the Stark effect to induce GAMMA-L transitions in asymmetrically stepped AlSb/InAs/GaSb/AlSb quantum wells (QWs). A significant feature of this structure is the unusual band alignments which localize two deep wells for the GAMMA and L bands in adjacent layers, i.e., the GAMMA-valley minimum is in the InAs while the L-valley minimum is in the GaSb. In contrast to a square QW, where the Stark shifts for both GAMMA and L subbands are in the same direction, the two step wells for GAMMA and L valleys in the proposed structure are oppositely biased in the presence of an electric field. Therefore, the first GAMMA and L subbands move toward each other, making the GAMMA-L crossover occur more efficiently. Near this point, most of the GAMMA electrons transfer to the L valleys, where they are allowed to make intersubband transitions under normally incident radiation. As a result, the device switches from being transparent to normal-incidence light o strongly absorbing it. The calculations indicate that excellent on/off ratios can be achieved in this structure operating at T less-than-or-equal-to 150 K with electric fields on the order of approximately 100 kV/cm for any infrared Wavelength within the range of 3-20 mum. C1 USN,RES LAB,WASHINGTON,DC 20375. RP XIE, H (reprint author), COLUMBIA UNIV,DEPT ELECT ENGN,NEW YORK,NY 10027, USA. NR 29 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 JUL 1 PY 1994 VL 76 IS 1 BP 92 EP 96 DI 10.1063/1.357065 PG 5 WC Physics, Applied SC Physics GA NW318 UT WOS:A1994NW31800011 ER PT J AU SUN, CJ KUNG, P SAXLER, A OHSATO, H BIGAN, E RAZEGHI, M GASKILL, DK AF SUN, CJ KUNG, P SAXLER, A OHSATO, H BIGAN, E RAZEGHI, M GASKILL, DK TI THERMAL-STABILITY OF GAN THIN-FILMS GROWN ON (0001) AL2O3, (01(1)OVER-BAR-2) AL2O3 AND (0001)SI 6H-SIC SUBSTRATES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GALLIUM AB Single crystals of GaN were grown on (0001), (0112BAR) Al2O3 and (0001)Si 6H-SiC substrates using an atmospheric pressure metalorganic chemical-vapor-deposition reactor. The relationship has been studied between the thermal stability of the GaN films and the substrate's surface polarity. It appeared that the N-terminated (0001) GaN surface grown on (0001)si 6H-SiC has the most stable surface, followed by the nonpolar (1120BAR) GaN surface grown on (0112BAR) Al2O3, while the Ga-terminated (0001) GaN surface grown on (0001) Al2O3 has the least stable surface. This is explained with the difference in the atomic configuration of each of these surfaces which induces a difference in their thermal decomposition. C1 USN,RES LAB,ADV MAT SYNTH LAB,WASHINGTON,DC 20375. RP SUN, CJ (reprint author), NORTHWESTERN UNIV,CTR QUANTUM DEVICES,DEPT ELECT ENGN & COMP SCI,EVANSTON,IL 60208, USA. RI Razeghi, Manijeh/B-7265-2009; OI OHSATO, Hitoshi/0000-0003-3929-4547 NR 15 TC 79 Z9 80 U1 3 U2 12 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 JUL 1 PY 1994 VL 76 IS 1 BP 236 EP 241 DI 10.1063/1.357133 PG 6 WC Physics, Applied SC Physics GA NW318 UT WOS:A1994NW31800031 ER PT J AU DAHMANI, R SALAMANCARIBA, L NGUYEN, NV CHANDLERHOROWITZ, D JONKER, BT AF DAHMANI, R SALAMANCARIBA, L NGUYEN, NV CHANDLERHOROWITZ, D JONKER, BT TI DETERMINATION OF THE OPTICAL-CONSTANTS OF ZNSE FILMS BY SPECTROSCOPIC ELLIPSOMETRY SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Spectroscopic ellipsometry was used to determine the real and imaginary parts of the dielectric function of ZnSe thin films grown on (001) GaAs substrates by molecular-beam epitaxy, for energies between 1.5 and 5.0 eV A sum of harmonic oscillators is used to fit the dielectric function in order to determine the values of the threshold energies at the critical points. The fundamental energy gap was determined to be at 2.68 eV The E0+DELTA0 and E1 points were found to be equal to 3.126 and 4.75 eV, respectively. Below the fundamental absorption edge, a Sellmeir-type function was used to represent the refractive index. At the critical points, E0 and E0+DELTA0, the fitting was improved by using an explicit function combining the contributions of these two points to the dielectric function. C1 UNIV MARYLAND,DEPT MAT & NUCL ENGN,COLL PK,MD 20742. USN,RES LAB,WASHINGTON,DC 20375. RP DAHMANI, R (reprint author), UNIV MARYLAND,DEPT CHEM PHYS,COLL PK,MD 20742, USA. RI Salamanca-Riba, Lourdes/B-3785-2009 OI Salamanca-Riba, Lourdes/0000-0001-8155-6403 NR 11 TC 40 Z9 41 U1 1 U2 5 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 JUL 1 PY 1994 VL 76 IS 1 BP 514 EP 517 DI 10.1063/1.358484 PG 4 WC Physics, Applied SC Physics GA NW318 UT WOS:A1994NW31800075 ER PT J AU HIMM, JF HOMER, LD NOVOTNY, JA AF HIMM, JF HOMER, LD NOVOTNY, JA TI EFFECT OF LIPID ON INERT-GAS KINETICS SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE TRANSIT TIME; MUSCLE; XENON; MONTE CARLO METHOD; REGIONAL BLOOD FLOW; COMPUTER SIMULATION; BLOOD SUPPLY ID SKELETAL-MUSCLE; BLOOD-FLOW; MICROVASCULATURE; EXCHANGE; WASHOUT; TISSUES; MODEL AB A Monte Carlo simulation of inert gas transit through skeletal muscle has been extended to include regions of increased gas solubility to simulate regions of high lipid content. Position of the regions within the simulation module was varied, as was the muscle-lipid partition coefficient (lambda). The volume percentage of the lipid regions (alpha) was varied from 0 to 25% while lambda covered the range from 1 to 50. The effects of 3.0.CO;2-S PG 13 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA NU176 UT WOS:A1994NU17600009 ER PT J AU KWON, YW SALINAS, D NEIBERT, MJ AF KWON, YW SALINAS, D NEIBERT, MJ TI THERMALLY-INDUCED STRESSES IN A TRILAYERED SYSTEM SO JOURNAL OF THERMAL STRESSES LA English DT Article AB The objective of this investigation is to conduct a parametric study of thermally induced stresses in trilayered media. In particular, the resulting shear and normal stresses along the media interfaces is analyzed. Because this investigation is concerned only with the failure at the bonding surfaces, the results of bending stresses, although calculated, are not presented. A finite element model utilizing a recently developed element that provides for both axial and lateral displacement continuity is employed. First, the effect of the material property, that is, coefficient of thermal expansion, is examined. Then the effect of geometric configuration, that is, the length and thickness dimensions of the midlayer, is analyzed. Finally, a study of the effect of a nonuniform temperature field on the trimaterial medium is conducted. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 9 TC 8 Z9 8 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0149-5739 J9 J THERM STRESSES JI J. Therm. Stresses PD JUL-SEP PY 1994 VL 17 IS 3 BP 489 EP 506 DI 10.1080/01495739408946274 PG 18 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA PF547 UT WOS:A1994PF54700012 ER PT J AU TWIDWELL, J AF TWIDWELL, J TI RUPTURED TESTICULAR PROSTHESIS SO JOURNAL OF UROLOGY LA English DT Note DE PROSTHESIS FAILURE; SILICONES; TESTIS ID HUMAN ADJUVANT DISEASE; GEL BREAST IMPLANTS; SILICONE GEL; AUTOIMMUNE-DISEASE; MIGRATION; AUGMENTATION; DIAGNOSIS AB The diagnosis and treatment of a ruptured testicular prosthesis are discussed, and problems associated with silicone gel prostheses are reviewed. RP TWIDWELL, J (reprint author), USN HOSP JACKSONVILLE,DEPT UROL,JACKSONVILLE,FL, USA. NR 14 TC 10 Z9 10 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD JUL PY 1994 VL 152 IS 1 BP 167 EP 168 PG 2 WC Urology & Nephrology SC Urology & Nephrology GA NQ770 UT WOS:A1994NQ77000048 PM 8201654 ER PT J AU PROKES, SM RAI, AK AF PROKES, SM RAI, AK TI COMPARISON OF 2 EPITAXIAL FORMATION MECHANISMS IN THE SIGE SYSTEM AND THE SUBSEQUENT DEFECT GENERATION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 40th National Symposium of the American-Vacuum-Society CY NOV 15-19, 1993 CL ORLANDO, FL SP AMER VACUUM SOC ID WET OXIDATION; FILMS; SUPERLATTICES; SI(100); SILICON; GROWTH; LAYERS; MBE AB Two epitaxial growth mechanisms have been examined, and the resulting defect generations will be discussed. The first growth process involved molecular-beam epitaxy (MBE), while the second employed wet oxidation to form a Ge-rich epilayer from an initially amorphous film. The MBE-grown high Ge content layers evolved by island coalescence, while the oxidation-produced high Ge content layers formed by a Ge exchange mechanism below a contamination layer, leading to a more uniform epitaxial layer. Due to the very different growth modes, the resulting dislocation, stacking fault, and twin densities were reduced, along with a reduction in the surface roughness. C1 UES INC,DAYTON,OH 45432. RP PROKES, SM (reprint author), USN,WASHINGTON,DC 20375, USA. NR 14 TC 3 Z9 3 U1 0 U2 1 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 JUL-AUG PY 1994 VL 12 IS 4 BP 1148 EP 1151 DI 10.1116/1.579182 PN 1 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA NZ030 UT WOS:A1994NZ03000043 ER PT J AU JUNG, TM PROKES, SM KAPLAN, R AF JUNG, TM PROKES, SM KAPLAN, R TI GROWTH AND ENERGETICS OF GA AND AL CHAINS ON SI(112) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID BEAM EPITAXIAL-GROWTH; VICINAL SI(111); SURFACES; SI(100); SILICON; LEED AB We present a low-energy electron diffraction and Auger electron spectroscopy (AES) study of the growth of Al and Ga chains on Si(112) substrates. For substrate temperatures between 500 and 650-degrees-C growth proceeds first by the creation of metal atom chains along the step edges of the (112) surface. Once the step-edge sites have been occupied, a state defined here as ''saturation coverage,'' excess deposition leads to island formation with no further increase in the metal AES signal intensity. The clean Si(112) (1 X 2) surface reconstruction is removed upon the formation of the metal chains so that the equivalence of adjacent single-layer-height steps is restored. At the saturation coverage both the Al and Ga chains exhibit a sixfold periodicity along the step edge, or [110BAR], direction. Below the saturation coverage these chains can also exhibit a fivefold periodicity along the same direction. We propose a model in which the periodicities of the chains are determined by the density of dimerized Si edge atoms, i.e, metal atom vacancies, whose presence balances the tensile stress imposed by the larger metal atoms. We investigate the relative binding energies of Al and Ga to the step-edge sites and find that Al atoms are more strongly bound. At substrate temperatures near 600-degrees-C die deposition of Al on a Ga saturated surface leads to the complete substitution of Ga by Al atoms at the step-edge sites. RP JUNG, TM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 28 Z9 28 U1 1 U2 4 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 JUL-AUG PY 1994 VL 12 IS 4 BP 1838 EP 1842 DI 10.1116/1.579014 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA NZ032 UT WOS:A1994NZ03200009 ER PT J AU TUPPER, KJ COLTON, RJ BRENNER, DW AF TUPPER, KJ COLTON, RJ BRENNER, DW TI SIMULATIONS OF SELF-ASSEMBLED MONOLAYERS UNDER COMPRESSION - EFFECT OF SURFACE ASPERITIES SO LANGMUIR LA English DT Letter ID SCANNING-TUNNELING-MICROSCOPY; ATOMIC FORCE MICROSCOPY; LANGMUIR-BLODGETT FILMS; GOLD SURFACES; ORGANOSULFUR COMPOUNDS; MECHANICAL RELAXATION; MOLECULAR-DYNAMICS AB Molecular dynamics simulations are used to probe the response of a self-assembled monolayer of hexadecanethiol chemisorbed on a gold(111) surface to compression with a flat surface and a surface with atomic-scale roughness in the form of surface asperities. The film responds elastically with only a uniform change in tilt angle upon compression to low loads with the flat surface. In contrast, our results show that the asperities are able to get closer to the substrate relative to the flat surface at comparable loads without completely disrupting the film and that at higher loads the monolayer film disorders by creating a large number of gauche defects in order to accommodate the asperity. The findings presented in this work support conclusions based on recent scanning tunneling microscopy studies on self-assembled monolayers that imaging occurs at surface asperities which penetrate the film. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RI Brenner, Donald/D-1741-2009 NR 22 TC 61 Z9 61 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUL PY 1994 VL 10 IS 7 BP 2041 EP 2043 DI 10.1021/la00019a002 PG 3 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NY163 UT WOS:A1994NY16300002 ER PT J AU TUPPER, KJ BRENNER, DW AF TUPPER, KJ BRENNER, DW TI COMPRESSION-INDUCED STRUCTURAL TRANSITION IN A SELF-ASSEMBLED MONOLAYER SO LANGMUIR LA English DT Article ID MECHANICAL RELAXATION; SIMULATION; DYNAMICS AB Molecular dynamics simulations are used to probe the atomic-scale behavior of a model for a self-assembled monolayer of n-hexadecanethiol chemisorbed on a gold (111) surface compressed under high loads. These simulations suggest that SAMs may undergo abrupt rearrangements during compression that retain efficient packings of the chains. These changes may in turn modify the elastic properties of the films without chain entanglement or film destruction. We propose that the signature of such a transition is visible in a force profile recently measured by Joyce et al. (Phys. Rev. Lett. 1992, 68, 2790) with an interfacial force microscope. RP TUPPER, KJ (reprint author), USN,RES LAB,DIV CHEM,CODE 6179,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 14 TC 77 Z9 79 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUL PY 1994 VL 10 IS 7 BP 2335 EP 2338 DI 10.1021/la00019a051 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NY163 UT WOS:A1994NY16300051 ER PT J AU PROCTOR, B NUTTING, M AF PROCTOR, B NUTTING, M TI MINE COUNTERMEASURE SUPPORT PLATFORM CONVERSION SHIP DESIGN SO MARINE TECHNOLOGY AND SNAME NEWS LA English DT Article AB U.S. Navy experience gained from the mine countermeasures (MCM) operations against the mines planted by Iraq during Operation Desert Storm highlighted the need for a centralized platform for support of MCM operations. This centralized Mine Countermeasures Support (MCS) platform would meet two critical needs: it would enable the employment of integrated MCM forces and it would allow the MCM Group Commander to be deployed with those MCM forces. Full integration of all MCM forces by the MCM Commander is the key to effective MCM operations. The MCM forces comprised Airborne Mine Countermeasures (AMCM), Surface Mine Countermeasures (SMCM) and Explosive Ordnance Disposal Mine Countermeasures (EODMCM). The strengths of each must be captured and coordinated by the MCM Commander. AMCM assets are capable of rapidly deploying to conduct reconnaissance, precursor and clearance MCM operations. SMCM assets are more capable of sustained large area mine clearance and possess an organic ability to neutralize located mines. EODMCM assets are specialized EOD detachments that are also capable of rapidly deploying to support AMCM and SMCM minehunting and mechanical sweeping operations by identifying, neutralizing or countercharging, recovering, exploiting and disposing of sea mines. USS Inchon (LPH-12) has been selected by the U.S. Navy as the most cost-effective platform to provide a near-term solution which will meet the requirements discussed above. After a brief discussion of MCM operations, other candidate MCS platforms studied, and the far-term (new construction) MCS(X), the remainder of the paper will focus on the conversion of the LPH-12 to operate as the centralized platform for MCM operations. RP PROCTOR, B (reprint author), USN,SEA SYST COMMAND,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0025-3316 J9 MAR TECHNOL SNAME N JI Mar. Technol. Sname News PD JUL PY 1994 VL 31 IS 3 BP 201 EP 214 PG 14 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA NV698 UT WOS:A1994NV69800007 ER PT J AU VANTUYL, AH AF VANTUYL, AH TI ACCELERATION OF CONVERGENCE OF A FAMILY OF LOGARITHMICALLY CONVERGENT SEQUENCES SO MATHEMATICS OF COMPUTATION LA English DT Article DE ACCELERATION OF CONVERGENCE; LOGARITHMIC CONVERGENCE; LEVIN U-TRANSFORM; THETA-ALGORITHM; RHO-ALGORITHM; SLOWLY CONVERGENT SERIES; SLOWLY CONVERGENT SEQUENCES; TRANSFORMATIONS OF SEQUENCES ID TRANSFORMATIONS; SERIES; ALGORITHM AB The asymptotic behavior of several sequence transformations is investigated as n --> infinity when applied to a certain family of logarithmically convergent sequences. The transformations considered are the iterations of the transformations e1(s)(A(n)) of Shanks and W(n) of Lubkin, the theta-algorithm of Brezinski, the Levin u- and upsilon-transforms, and generalizations of the rho-algorithm and the Neville table. Computational results are given for both real and complex sequences. C1 USN,CTR SURFACE WARFARE,APPL MATH BRANCH,SILVER SPRING,MD 20903. NR 22 TC 4 Z9 4 U1 1 U2 1 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0025-5718 J9 MATH COMPUT JI Math. Comput. PD JUL PY 1994 VL 63 IS 207 BP 229 EP 246 PG 18 WC Mathematics, Applied SC Mathematics GA NV029 UT WOS:A1994NV02900013 ER PT J AU CHEN, JK VANDERMEER, RA REYNOLDS, WT AF CHEN, JK VANDERMEER, RA REYNOLDS, WT TI EFFECTS OF ALLOYING ELEMENTS UPON AUSTENITE DECOMPOSITION IN LOW-C STEELS SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID CENTRAL-ATOMS MODEL; BAINITE TRANSFORMATION; FERRITE ALLOTRIOMORPHS; SILICON STEEL; GROWTH; KINETICS; MN AB The kinetics of austenite decomposition were studied in high-purity Fe-0.1C-0.4Mn-0.3Si-X (concentrations in weight percent; X represents 3Ni, 1Cr, or 0.5Mo) steels at temperatures between 500-degrees-C and 675-degrees-C. The transformation stasis phenomenon was found in the Fe-C-Mn-Si-Mo and Fe-C-Mn-Si-Ni alloys isothermally transformed at 650-degrees-C and 675-degrees-C but not in the Fe-C-Mn-Si and Fe-C-Mn-Si-Cr alloys at any of the temperatures investigated. The occurrence of transformation stasis was explained by synergistic interactions among alloying elements. The paraequilibrium model was applied to calculate the metastable fraction of ferrite in each alloy. This fraction was shown to coincide with cessation of transformation in the Mo alloy transformed at 600-degrees-C. Transformation stasis was found in both the Ni and the Mo alloys isothermally reacted at 650-degrees-C and 675-degrees-C. The interactions among Mn, Si, and Mo, as well as interactions among Mn, Si, and Ni, appear to decrease the threshold concentrations for transformation stasis in Fe-C-Mn-Si systems. Segregation of Mn and Mo to the alpha/gamma boundary, assisted by the presence of Si, was suggested to enhance the solute draglike effect (SDLE) and lead to transformation stasis. In the Ni alloy, a lower driving force for ferrite formation resulting from the Ni addition could be responsible for the occurrence of transformation stasis. C1 USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375. RP CHEN, JK (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT MAT SCI & ENGN,BLACKSBURG,VA 24061, USA. RI Chen, J.K./O-2101-2015 OI Chen, J.K./0000-0001-8693-4442 NR 50 TC 10 Z9 11 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 JUL PY 1994 VL 25 IS 7 BP 1367 EP 1379 DI 10.1007/BF02665470 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NU215 UT WOS:A1994NU21500004 ER PT J AU CHEN, SL OLDFIELD, W CHANG, YA THOMAS, MK AF CHEN, SL OLDFIELD, W CHANG, YA THOMAS, MK TI MODELING SOLIDIFICATION OF TURBINE-BLADES USING THEORETICAL PHASE-RELATIONSHIPS SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID METAL BINARY-SYSTEMS; THERMOCHEMICAL DATA; DIAGRAMS AB The solidification of hot-stage turbine blades made from Rene N4 nickel-base superalloy has been modeled to show the morphology of porosity and the local changes in solute concentration. The key task of the present study was the calculation of the solid-liquid phase equilibria of this 9-component nickel-base superalloy from the thermodynamic values of these phases. The Gibbs energies of the solid and liquid phases were obtained from those of the 36 binaries using the Muggianu and Kohler methods of extrapolation. The phase equilibrium data were then used to compute the change in fraction solid with temperature, initially using the complete mixing approximation (Scheil equation). The predicted freezing range was somewhat longer than measured. A modified Scheil equation was derived assuming incomplete mixing. Assuming 60 pct mixing of the solute, the calculated freezing range agreed with experiments. Fraction solid temperature allowed the detailed morphology of the ''mushy'' zone to be predicted. Using measured dendrite spacings and assuming the crystals to grow in a cubic array, the shape of the crystals and, consequently, the size of the liquid channels were predicted as a function of position. Hence, computation of the rate of fluid flow in the channels (from the known changes of temperature with time) allowed the pore morphology to be inferred. C1 MAT & COMP SIMULAT INC,HERTFORD,NC 27944. USN,CTR AIR WARFARE,WARMINSTER,PA 18974. RP CHEN, SL (reprint author), UNIV WISCONSIN,DEPT MAT SCI & ENGN,MADISON,WI 53706, USA. NR 17 TC 16 Z9 18 U1 0 U2 5 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 JUL PY 1994 VL 25 IS 7 BP 1525 EP 1533 DI 10.1007/BF02665484 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NU215 UT WOS:A1994NU21500018 ER PT J AU NUSS, WA TITLEY, DW AF NUSS, WA TITLEY, DW TI USE OF MULTIQUADRIC INTERPOLATION FOR METEOROLOGICAL OBJECTIVE ANALYSIS SO MONTHLY WEATHER REVIEW LA English DT Article ID COMPUTATIONAL FLUID-DYNAMICS; DATA APPROXIMATION SCHEME; EQUATIONS; DISCRETE AB The method of multiquadric interpolation is described and compared to the Barnes and Cressman methods of meteorological objective analysis. The method of multiquadric interpolation uses hyperboloid radial basis functions to fit scattered data to a uniform grid. Results for an analytical function indicate that the method is more accurate than the Barnes or Cressman methods. Application to actual meteorological data indicates that multiquadric interpolation produces excellent analyses that retain small-scale features resolved by the observations in any subregion of the analysis. RP NUSS, WA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 18 TC 98 Z9 102 U1 0 U2 0 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 JUL PY 1994 VL 122 IS 7 BP 1611 EP 1631 DI 10.1175/1520-0493(1994)122<1611:UOMIFM>2.0.CO;2 PG 21 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NU466 UT WOS:A1994NU46600013 ER PT J AU PICKETT, WE PEDERSON, MR DAVIDSON, BN AF PICKETT, WE PEDERSON, MR DAVIDSON, BN TI MODELING CVD DIAMOND WITH DENSITY-FUNCTIONAL THEORY SO NANOTECHNOLOGY LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; GROWTH-MECHANISM; SIMULATIONS; RECONSTRUCTION; APPROXIMATION; HYDROGENATION; SURFACES; METHYL; FILMS AB Chemical vapor deposition (CVD) of polycrystalline films of diamond has improved dramatically during the past six years. During this time there have been parallel developments in modeling chemical processes at a diamond surface, with many of the first-principle studies being carried out within the density functional framework. We review our work on furthering the understanding of chemical processes that may be important in the growth process, which requires knowledge of first, the surfaces themselves and second, adsorption of hydrocarbon radicals to add more layers. Studies of both clean and hydrogenated (111), (100), and (110) surfaces of diamond show that clean surfaces tend to undergo strong relaxation and reconstruction while hydrogenation results in inert surfaces. Modeling interactions of various hydrocarbon radicals with diamond surfaces provides energies and geometries of viable processes while eliminating from further consideration processes that are found to be unfavorable. We also discuss briefly recent investigation of behavior at a step on a clean diamond surface, which may indicate a process leading to graphitization of the diamond surface. RP PICKETT, WE (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,CODE 6690,WASHINGTON,DC 20375, USA. NR 28 TC 4 Z9 4 U1 0 U2 4 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0957-4484 J9 NANOTECHNOLOGY JI Nanotechnology PD JUL PY 1994 VL 5 IS 3 BP 172 EP 178 DI 10.1088/0957-4484/5/3/004 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied SC Science & Technology - Other Topics; Materials Science; Physics GA PV497 UT WOS:A1994PV49700004 ER PT J AU LAWSON, TN AF LAWSON, TN TI NAVAL SPECIAL WARFARE FUTURE CONCEPTS - THE CASE FOR OPERATIONAL MOBILITY - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP LAWSON, TN (reprint author), USN,NAVAL SPECIAL WARFARE PROGRAMS,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 126 EP 127 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100041 ER PT J AU BOSWORTH, ML AF BOSWORTH, ML TI NAVAL SPECIAL WARFARE FUTURE CONCEPTS - THE CASE FOR OPERATIONAL MOBILITY - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP BOSWORTH, ML (reprint author), USN,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 127 EP 128 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100043 ER PT J AU MADDRY, E AF MADDRY, E TI AN AIRBORNE PASSIVE ACTIVE ELECTROOPTIC SENSOR SYSTEM FOR THEATER BALLISTIC-MISSILE DEFENSE - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP MADDRY, E (reprint author), USN,CTR SURFACE WARFARE,THEATER BALLIST MISSILE DEF,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 129 EP 131 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100045 ER PT J AU ANDRESS, T AF ANDRESS, T TI SHIP SELF-DEFENSE PERFORMANCE ASSESSMENT METHODOLOGY - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP ANDRESS, T (reprint author), USN,OFF CHIEF NAVAL OPERAT,SHIPS & COMBAT SYST BRANCH,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 134 EP 135 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100049 ER PT J AU CARLE, GL AF CARLE, GL TI DESIGN CONSIDERATIONS INTEGRATING ETC GUN SYSTEMS ABOARD NAVAL SURFACE COMBATANTS - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP CARLE, GL (reprint author), USN,DEPT COMBAT SYST,AEGIS SYST ENGN BRANCH,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 136 EP 137 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100054 ER PT J AU VALDES, EL SULLIVAN, MJ AF VALDES, EL SULLIVAN, MJ TI LIVE FIRE TEST AND EVALUATION FOR SHIPS - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP VALDES, EL (reprint author), USN,DIV AEGIS DESTROYER,AEGIS PROGRAM PMS 400,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 141 EP 144 PG 4 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100058 ER PT J AU CALVANO, CN AF CALVANO, CN TI LIVE FIRE TEST AND EVALUATION FOR SHIPS - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP CALVANO, CN (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, 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 JUL PY 1994 VL 106 IS 4 BP 145 EP 146 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100060 ER PT J AU ROLLE, AL AF ROLLE, AL TI THE FORWARD-DEPLOYED SONAR (FDS) AND THE MINE COUNTERMEASURE VESSEL (MCMV) - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP ROLLE, AL (reprint author), USN,CTR SURFACE WARFARE,DIV MINE COUNTERMEASURES,DAHLGREN DIV,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 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 JUL PY 1994 VL 106 IS 4 BP 150 EP 151 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100063 ER PT J AU CHEWNING, IM AF CHEWNING, IM TI SHIP REPAIR COST MODEL - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP CHEWNING, IM (reprint author), USN,SEA SYST COMMAND,DIV COST ESTIMATING & ANAL,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 155 EP 156 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100067 ER PT J AU ELTRINGHAM, PS AF ELTRINGHAM, PS TI THE MAINTENANCE REQUIREMENTS SYSTEM - RISK-BASED RESOURCE PROGRAMMING AT WORK - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP ELTRINGHAM, PS (reprint author), USN,USS WASP LHD-1,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 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 JUL PY 1994 VL 106 IS 4 BP 158 EP 159 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100070 ER PT J AU MADSEN, L AF MADSEN, L TI THE MAINTENANCE REQUIREMENTS SYSTEM - RISK-BASED RESOURCE PROGRAMMING AT WORK - COMMENT SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP MADSEN, L (reprint author), USN,OFF CHIEF NAVAL OPERAT,DIV SUPPORTABIL MAINTENANCE & MODERNIZAT,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 159 EP 160 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100071 ER PT J AU OUILLETTE, JJ AF OUILLETTE, JJ TI DDG-51 CLASS COMPUTER-AIDED-DESIGN SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Computer-Aided Design and Computer-Aided Manufacturing technology is being implemented in the U.S. Navy's Arleigh Burke (DDG-51) Class Aegis Destroyer Program. Under the Navy's direction, the DDG-51 class construction yards are aggressively pursuing the transition to CAD-based design, construction and life cycle support. Through the CAD initiative, acquisition costs can be reduced without reduction of ships' capability. Building a three dimensional (3D) computer generated model of the ship prior to construction will facilitate the identification and resolution of interference and interface problems that would otherwise remain undetected until actual ship construction. The 3D database contains geometry and design data to support system design and concurrent engineering and is exchanged electronically between the construction yards. Detailed design drawings, fabrication sketches, and numerical control (NC) data are extracted directly from the database to support construction. At the completion of ship construction, as-built models will be provided to the planning yard for life cycle support. RP OUILLETTE, JJ (reprint author), USN,AEGIS PROGRAM OFF,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 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 JUL PY 1994 VL 106 IS 4 BP 165 EP 173 PG 9 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100077 ER PT J AU FERREIRO, LD SMITH, TC THOMAS, WL MACEDO, R AF FERREIRO, LD SMITH, TC THOMAS, WL MACEDO, R TI PITCH STABILIZATION FOR SURFACE COMBATANTS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Pitching is one of the most damaging motions for a ship, and is the obvious choice after rolling for reduction to improve ship operability. Although SWATHs or bigger monohulls have greater operability, they are often costly. Therefore, some method of stabilizing pitch on existing combatant hulls should be found. Historical research has shown that devices such as transom flaps and bow fins are ineffective or undesirable, but canted rudders show some promise. Using criteria for ASW and mobility operations, a destroyer hull equipped with large canted rudders using rudder pitch stabiliazation (RPS) was modeled on seakeeping evaluation programs. Its motion and operability were compared with a baseline hull (no RPS) as well as a SWATH and a larger Seakeeping Monohull. RPS reduced pitch motions 30-40% and improved operability 6-11% over the baseline hull, making its seakeeping performance comparable to the SWATH and Seakeeping Monohull. The use of high-lift devices can provide the same performance with reasonably sized rudders. We recommend a program to further develop pitch stabilization using high-lift canted rudders, including development of high-lift foil technology and small-scale validation of the RPS concept. RP FERREIRO, LD (reprint author), USN,NAVSEA,SURFACE SHIP DESIGN GRP,WASHINGTON,DC 20350, 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 JUL PY 1994 VL 106 IS 4 BP 174 EP 191 PG 18 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100078 ER PT J AU KHAN, MZS SAUNDERS, DS BURCH, IA MOURITZ, AP AF KHAN, MZS SAUNDERS, DS BURCH, IA MOURITZ, AP TI MATERIALS ASPECTS OF DAMAGE TOLERANCE AND RELIABILITY OF SHIP STRUCTURES AND COMPONENTS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The design and development process prior to the fabrication of maritime structures such as merchant ships, naval surface ships and submarines include the specification of a range of materials required to perform under most adverse conditions of environment and operational loads. The damage tolerance and reliability of such structures can only be assured through appropriate materials selection, application of regorous testing methodologies and through-life inspection and monitoring. The importance of the consideration of damage tolerance and reliability of maritime structures can be gauged by the consequences of in-service failures; for example, the break-up of merchant ships resulting in environmental disasters, loss of lives and wartime damage of naval ships and submarines. Factors that lead to service failures include corrosion, fatigue, corrosion fatigue, low toughness and poor design, and often these factors occur in combination. The range of materials used in maritime structures is diverse and includes mild steel (ship) plate, micro-alloyed steels, aluminium alloys and monolithic and foam sandwich glass fibre laminates. These materials all have different responses to the environmental and loading conditions and consequently extensive materials testing programs are necessary to put damage tolerance and reliability indicators in place. This paper addresses the materials and testing aspects of damage tolerance and reliability assessment of maritime structures, and deals broadly with corrosion and corrosion fatigue testing; fracture toughness testing; measurement of residual stresses within the structure; damage assessment and life calculations. The paper discusses testing methodologies that obtain essential property data for various materials under a range of environmental and loading conditions. The paper briefly addresses the application of property data to the prediction of the behavior of maritime structures and components as well as application to life prediction methodologies. The performance of the maritime structures and components in service can be monitored by many methods. The resultant outputs from the monitoring systems can be indicators of the development of damage within the structure and used to predict the behaviour of the damaged structure for reliability assessment. The future needs for the monitoring of maritime structures and components are discussed and some examples of monitoring methods will be presented. RP KHAN, MZS (reprint author), USN,SHIP STRUCT RES PROGRAM,WASHINGTON,DC 20350, USA. NR 0 TC 2 Z9 2 U1 1 U2 4 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 JUL PY 1994 VL 106 IS 4 BP 192 EP 207 PG 16 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA PH041 UT WOS:A1994PH04100079 ER PT J AU SHARP, GD AF SHARP, GD TI RECRUITMENT IN FLATFISH - LINES FOR FUTURE-RESEARCH SO NETHERLANDS JOURNAL OF SEA RESEARCH LA English DT Article; Proceedings Paper CT 2nd International Symposium on Flatfish Ecology CY SEP 30-OCT 06, 1993 CL NETHERLANDS INST SEA RES, TEXEL, NETHERLANDS HO NETHERLANDS INST SEA RES ID GROWTH AB Understanding of any generalities and principles in fisheries science comes only after substantial efforts to collate and compare available information. This second flatfish symposium was formulated around the concept of falsifying testable hypotheses, although the results were marginal at best, and progress toward any novel insights was elusive. I have a history of posing the question, Why? I attempted to answer this by pointing out some of the information voids necessary to the integration of organismal physiology and behaviours, appropriate scale environmental variabilities, and the lack of our ability, or opportunity, to measure any of these processes on sufficient numbers of species to gain those insights. Second, I wonder why the continued statistical efforts to manipulate great masses of fuzzy fisheries catch and sampling data, particularly when the action in life histories of fishes takes place at the local scale, upon individuals, in a very nearly binary fashion, rather than over a somehow unified distribution that would be required in order to apply, appropriately, mean and variance or regression procedures. That there has to be a stock-recruitment relation is not logical. That plaice appear to have one implies two things: that there is a real bottle-neck in their adult habitat, and/or, that the stock/recruitment data are themselves misleading artifacts. I remain convinced that the answers lie in better understanding of predator-prey relations, and much better understanding of physiologically significant environmental variabilities, rather than in more sophisticated mathematical processing of inadequate, and indirect inferences. Flatfish are proving themselves to be fish, with a twist. That is encouraging, but not enlightening. RP SHARP, GD (reprint author), USN,POSTGRAD SCH FDN INC,COOPERAT INST RES INTEGRATED OCEAN SCI,2560 GARDEN RD,SUITE 101,MONTEREY,CA 93940, USA. NR 8 TC 4 Z9 4 U1 0 U2 0 PU NETHERLANDS INST SEA RES PI TEXEL PA PO BOX 59 1790 AB DEN BURG, TEXEL, NETHERLANDS SN 0077-7579 J9 NETH J SEA RES JI Neth. J. Sea Res. PD JUL PY 1994 VL 32 IS 2 BP 227 EP 230 DI 10.1016/0077-7579(94)90043-4 PG 4 WC Marine & Freshwater Biology; Oceanography SC Marine & Freshwater Biology; Oceanography GA PG725 UT WOS:A1994PG72500012 ER PT J AU SEWELL, DD JESTE, DV MCADAMS, LA BAILEY, A HARRIS, MJ ATKINSON, JH CHANDLER, JL MCCUTCHAN, JA 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 SEWELL, DD JESTE, DV MCADAMS, LA BAILEY, A HARRIS, MJ ATKINSON, JH CHANDLER, JL MCCUTCHAN, JA 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 NEUROLEPTIC TREATMENT OF HIV-ASSOCIATED PSYCHOSIS SO NEUROPSYCHOPHARMACOLOGY LA English DT Article DE TRANQUILIZING AGENTS, MAJOR; ORGANIC MENTAL DISORDERS; HALOPERIDOL; THIORIDAZINE; SCHIZOPHRENIA; AIDS ID AIDS PATIENT; MANAGEMENT; ENCEPHALOPATHY; SCHIZOPHRENIA; SYMPTOMS; SPECTRUM; DISEASE AB The aim of this rater-blinded randomized study was to evaluate the efficacy and side effects of haloperidol and thioridazine in the treatment of new-onset psychosis in HIV-positive individuals. Participants were 13 men who had no history of psychosis prior to infection with HIV, and whose psychosis was not attributable to delirium or to non-HIV-related organic factors. Participants were evaluated at baseline after at least one month without neuroleptic treatment and then weekly for six weeks of the experimental treatment using several rating scales. The mean daily dose in chlorpromazine equivalents was 124 mg. Both neuroleptics produced modest but significant reduction in overall level of psychosis and in positive symptoms, but not in negative symptoms. All the haloperidol-treated patients developed extrapyramidal side effects and required treatment with anticholinergic medication, whereas three of the five thioridazine-treated patients had noticeable side effects. We make recommendations for the treatment of HIV-associated psychosis with neuroleptics. C1 UNIV CALIF SAN DIEGO,SAN DIEGO HIV NEUROBEHAV RES CTR,SAN DIEGO,CA 92161. USN HOSP,SAN DIEGO HIV NEUROBEHAV RES CTR,SAN DIEGO,CA 92161. RP SEWELL, DD (reprint author), VET ADM MED CTR,PSYCHIAT SERV 116A,SAN DIEGO HIV NEUROBEHAV RES CTR,3350 LA JOLLA VILLAGE DR,SAN DIEGO,CA 92161, USA. FU NIMH NIH HHS [5 P50 MH45294, 5 R01 MH43298, 5 R01 MH45688] NR 29 TC 27 Z9 29 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0893-133X J9 NEUROPSYCHOPHARMACOL JI Neuropsychopharmacology PD JUL PY 1994 VL 10 IS 4 BP 223 EP 229 PG 7 WC Neurosciences; Pharmacology & Pharmacy; Psychiatry SC Neurosciences & Neurology; Pharmacology & Pharmacy; Psychiatry GA NX206 UT WOS:A1994NX20600001 PM 7945732 ER PT J AU HARIHAR, P CHEN, H STAPOR, WJ AF HARIHAR, P CHEN, H STAPOR, WJ TI ULTRAVIOLET FLUORESCENCE LIFETIME IN TRANS-STILBENE CRYSTAL WITH SINGLE PHOTONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID ISOMERIZATION AB The decay of 385 nm photons from a thin trans-stilbene crystal excited by 2 picosecond pulsed ultraviolet laser radiation was measured (P. Harihar et al., Bull. Am. Phys. Soc. Trans. 38 (1993) 1645) by the single photon method (L.M. Bollinger and G.E. Thomas, Rev. Sci. Instr. 32 (1961) 1044). C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP HARIHAR, P (reprint author), UNIV MASSACHUSETTS, DEPT PHYS, LOWELL, MA 01854 USA. NR 8 TC 3 Z9 3 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 EI 1872-9576 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1994 VL 345 IS 3 BP 500 EP 502 DI 10.1016/0168-9002(94)90506-1 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NV681 UT WOS:A1994NV68100016 ER PT J AU NUCKOLS, ML COURSON, BF AF NUCKOLS, ML COURSON, BF TI HEATED DIVER DECOMPRESSION SHELTER - THE WOMB CONCEPT SO OCEAN ENGINEERING LA English DT Article AB A hybrid thermal protection method using waste heat from a surface-mounted outboard motor is shown to create a warm ''micro-climate'' environment for divers. The effects of surface heater capacities, water flow rates, shelter volume and shelter insulation on micro-climate temperatures are characterized. During long, cold-water decompression stops this method offers a reliable, low-cost alternative to surface-supplied hot water suits or diver-carried heating systems. An added bonus for divers using closed-circuit breathing apparatus is prolonged durations of their carbon dioxide scrubbers when surrounded by the warm water ''micro-climate''. Closed-circuit and open-circuit options of this diver decompression shelter concept are evaluated. C1 COASTAL SYST STN,PANAMA CITY,FL 32407. RP NUCKOLS, ML (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 4 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 0029-8018 J9 OCEAN ENG JI Ocean Eng. PD JUL PY 1994 VL 21 IS 5 BP 433 EP 443 DI 10.1016/0029-8018(94)90017-5 PG 11 WC Engineering, Marine; Engineering, Civil; Engineering, Ocean; Oceanography SC Engineering; Oceanography GA NV685 UT WOS:A1994NV68500001 ER PT J AU SZU, HH AF SZU, HH TI ADAPTIVE WAVELET TRANSFORMS SO OPTICAL ENGINEERING LA English DT Editorial Material RP SZU, HH (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,CODE B44,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2103 EP 2103 DI 10.1117/12.189530 PG 1 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300002 ER PT J AU SZU, HH TELFER, BA AF SZU, HH TELFER, BA TI MATHEMATICS OF ADAPTIVE WAVELET TRANSFORMS - RELATING CONTINUOUS WITH DISCRETE-TRANSFORMS SO OPTICAL ENGINEERING LA English DT Article DE ADAPTIVE WAVELET TRANSFORM; DISCRETE WAVELET TRANSFORM; DISCRETE ADAPTIVE WAVELET TRANSFORM; QUADRATURE MIRROR FILTERS ID SIGNAL REPRESENTATION; GABOR TRANSFORMS; MATCHED-FILTERS; NEURAL NETWORKS; CLASSIFICATION AB We prove several theorems and construct explicitly the bridge between the continuous and discrete adaptive wavelet transform (AWT). The computational efficiency of the AWT is a result of its compact support closely matching linearly the signal's time-frequency characteristics, and is also a result of a larger redundancy factor of the superposition-mother s(x) (super-mother), created adaptively by a linear superposition of other admissible mother wavelets. The super-mother always forms a complete basis, but is usually associated with a higher redundancy number than its constituent complete orthonormal (CON) bases. The robustness of super-mother suffers less noise contamination (since noise is everywhere, and a redundant sampling by bandpassings can suppress the noise and enhance the signal). Since the continuous super-mother has been created off-line by AWT (using least-mean-squares neural nets), we wish to accomplish fast AWT on line. Thus, we formulate AWT in discrete high-pass (H) and low-pass (L) filter bank coefficients via the quadrature mirror filter (QMF), a digital subband lossless coding. A linear combination of two special cases of the complete biorthogonal normalized (Cbi-ON) QMF [L(z),H(z),L(dagger)(z),H(dagger)(z)], called alpha-bank and beta-bank, becomes a hybrid aalpha + bbeta-bank (for any real positive constants a and b) that is still admissible, meaning Cbi-ON and lossless. Finally, the power of AWT is the implementation by means of wavelet chips and neurochips, in which each node is a daughter wavelet similar to a radial basis function using dyadic affine scaling. RP SZU, HH (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN,CODE B44,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 41 TC 26 Z9 26 U1 0 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2111 EP 2124 DI 10.1117/12.173205 PG 14 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300005 ER PT J AU TELFER, BA SZU, HH DOBECK, GJ GARCIA, JP KO, H DUBEY, A WITHERSPOON, N AF TELFER, BA SZU, HH DOBECK, GJ GARCIA, JP KO, H DUBEY, A WITHERSPOON, N TI ADAPTIVE WAVELET CLASSIFICATION OF ACOUSTIC BACKSCATTER AND IMAGERY SO OPTICAL ENGINEERING LA English DT Article DE ADAPTIVE WAVELET TRANSFORMS; ACOUSTIC CLASSIFICATION; FEATURE SELECTION; MULTISPECTRAL IMAGE PROCESSING; NEURAL NETWORKS; SIDESCAN SONAR ID NEURAL NETWORKS; TRANSFORM; RECOGNITION AB The utility and robustness of wavelet features is demonstrated through three practical case studies of detecting objects in multispectral electro-optical imagery, sidescan sonar imagery, and acoustic backscatter. Attention is given to choosing proper waveforms for particular applications. Using artificial neural networks (ANNs), evidence is fused from multiple-waveform types that detect local features. The wavelet waveforms and their dilation and shift parameters are adaptively computed with ANNs to maximize classification accuracy. Emphasis is placed on the acoustic backscatter case study, involving detecting a metallic man-made object from natural and synthetic specular clutter with reverberation noise. The synthetic clutter is shown to be a good model for the natural clutter, which appears promising for avoiding huge data collection efforts for natural clutter and for better delineating the classification boundary. The classifier computes the locations, sizes, and weights of Gaussian patches in time-scale space that contain the most discriminatory information. This new approach is shown to give higher classification rates than an ANN with commonly used power spectral features. The new approach also reduces the number of free parameters in the classifier based on all wavelet features, which leads to simpler implementation for applications and to potentially better generalization to test data. C1 USN,CTR SURFACE WARFARE,COASTAL SYST STN,PANAMA CITY,FL 32407. RP TELFER, BA (reprint author), USN,CTR SURFACE WARFARE,EAHLGREN DIV,CODE B44,SILVER SPRING,MD 20910, USA. NR 28 TC 14 Z9 14 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2192 EP 2203 DI 10.1117/12.172257 PG 12 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300014 ER PT J AU CHEN, VC AF CHEN, VC TI RADAR AMBIGUITY FUNCTION, TIME-VARYING MATCHED-FILTER, AND OPTIMUM WAVELET CORRELATOR SO OPTICAL ENGINEERING LA English DT Article DE ADAPTIVE WAVELET TRANSFORMS; AMBIGUITY FUNCTION; MATCHED FILTERS; ADAPTIVE PROCESSORS; INVERSE SYNTHETIC APERTURE RADAR AB We review the relation between the radar ambiguity function and the matched filter, and then introduce a geometric concept of the matched filter as a slice of the ambiguity function along a frequency-shift line. With the help of this geometric concept, the conventional matched filter can be generalized to a time-varying matched filter, which is equivalent to the optimum time-frequency correlator and can be implemented with wavelet transforms. The application of the optimum wavelet correlator to the inverse synthetic aperture radar is illustrated. RP CHEN, VC (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,CODE 53601,WASHINGTON,DC 20375, USA. NR 13 TC 18 Z9 19 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2212 EP 2217 DI 10.1117/12.172252 PG 6 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300016 ER PT J AU SUN, MG SCLABASSI, RJ LI, CC ZHANG, YP SZU, HH AF SUN, MG SCLABASSI, RJ LI, CC ZHANG, YP SZU, HH TI SYMMETRICAL WAVELET TRANSFORMS FOR EDGE LOCALIZATION SO OPTICAL ENGINEERING LA English DT Article AB The performance of a wavelet-based edge detector is characterized by a set of digital filters that implement the wavelet transform. We clarify the issue of whether an implementation filter for the wavelet transform can be centered at the origin while still maintaining the desired spatial domain localization. It is shown that this is possible only when the filter (or the wavelet) possesses an even-symmetry* with respect to the origin. When the filter (or the wavelet) is antisymmetric with respect to the origin, however, the filter coefficients converge in the order of l/n, producing a poor spatial domain localization. We show that the optimal axis of antisymmetry for the filter is located at the half-sample point to either side of the origin. We also present a scheme to adjust the degree of spatial filtering to balance between two conflicting factors of suppressing noise and preserving edges. C1 UNIV PITTSBURGH,DEPT ELECT ENGN,PITTSBURGH,PA 15213. USN,CTR SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20903. RP SUN, MG (reprint author), UNIV PITTSBURGH,SCH MED,DEPT NEUROL SURG,PITTSBURGH,PA 15213, USA. NR 10 TC 7 Z9 11 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2272 EP 2281 DI 10.1117/12.172245 PG 10 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300023 ER PT J AU CHAO, TH LAU, B MICELI, WJ AF CHAO, TH LAU, B MICELI, WJ TI OPTICAL IMPLEMENTATION OF A MATCHING PURSUIT FOR IMAGE REPRESENTATION SO OPTICAL ENGINEERING LA English DT Article DE ADAPTIVE WAVELET TRANSFORMS; MATCHING PURSUITS; IMAGE REPRESENTATION; PATTERN RECOGNITION; OPTICAL PROCESSING AB We have developed a technique for image analysis, representation, and decomposition. This technique was motivated by Mallat and Zhang's matching-pursuit algorithm. We have altered and simplified the mechanics of this algorithm to enable an extremely fast implementation via optical processing. Initial computer simulations show that our algorithm is capable of decomposing and representing a 2-D image as a linear combination of basis images with both high speed and high fidelity. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP CHAO, TH (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2303 EP 2309 DI 10.1117/12.174456 PG 7 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300027 ER PT J AU SZU, HH HSU, CC THAKER, PA ZAGHLOUL, ME AF SZU, HH HSU, CC THAKER, PA ZAGHLOUL, ME TI IMAGE WAVELET TRANSFORMS IMPLEMENTED BY DISCRETE WAVELET CHIPS SO OPTICAL ENGINEERING LA English DT Article DE ADAPTIVE WAVELET TRANSFORMS; QUADRATURE MIRROR FILTERS, HARDWARE DESCRIPTION LANGUAGE; IMAGE PROCESSING; WAVELET CHIPS ID MATCHED-FILTERS; NEURAL NETWORKS; REPRESENTATION; CLASSIFICATION; SCALE AB Both discrete wavelet transform (DWT) and inverse DWT are implemented using the lossless quadrature mirror filter (QMF) bank. The image passing through the finite impulse response QMF filtering becomes blurred and thus requires fewer number of pixels. Such a decimation amounts to the critical sampling that leads to the complexity O (N) for N data. The data compression comes from the permissible bits per pixel dynamic range compression of those filtered images having fewer details. The image reconstruction at a telereceiving station is accomplished by means of the inverse DWT. Thus, a complete biorthogonal basis of QMF is implemented by a fast wavelet transform chip designed with Verilog HDL and the image processing is demonstrated numerically. Adaptive DWT is sketched. C1 GEORGE WASHINGTON UNIV,SCH ENGN & APPL SCI,WASHINGTON,DC 20052. RP SZU, HH (reprint author), USN,CTR NAVAL SURFACE WARFARE,DAHLGREN DIV,CODE B44,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 45 TC 16 Z9 18 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2310 EP 2325 DI 10.1117/12.173210 PG 16 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300028 ER PT J AU LEE, SY SZU, HH AF LEE, SY SZU, HH TI FRACTIONAL FOURIER-TRANSFORMS, WAVELET TRANSFORMS, AND ADAPTIVE NEURAL NETWORKS SO OPTICAL ENGINEERING LA English DT Article DE ADAPTIVE WAVELET TRANSFORMS; OPTICAL INFORMATION PROCESSING FRACTIONAL FOURIER TRANSFORMS; OPTICAL NEURAL NETWORKS ID OPTICAL IMPLEMENTATION; PATTERN-RECOGNITION; MATCHED-FILTERS; HOPFIELD MODEL; CLASSIFICATION AB A new optical architecture is developed, based on fractional Fourier transforms, that compromises between shift-invariant (frequency) and position-dependent filtering. The analogy of this architecture to wavelet transforms and adaptive neural networks is also presented. The ambiguity and Wigner distribution functions are obtainable from special cases of the filter. The filter design corresponds to the training of the neural networks, and an adaptive learning algorithm is developed based on gradient-descent error minimization and error back propagation. The extension to multilayer architecture is straightforward. C1 USN,CTR NAVAL SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20903. RP LEE, SY (reprint author), KOREA ADV INST SCI & TECHNOL,373-1 KUSONG DONG,TAEJON 305701,SOUTH KOREA. RI Lee, Soo-Young/C-1930-2011 NR 19 TC 28 Z9 30 U1 0 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD JUL PY 1994 VL 33 IS 7 BP 2326 EP 2330 DI 10.1117/12.172793 PG 5 WC Optics SC Optics GA NX463 UT WOS:A1994NX46300029 ER PT J AU GASTON, B KEITH, JF AF GASTON, B KEITH, JF TI NITRIC-OXIDE AND BLEEDING-TIME SO PEDIATRICS LA English DT Letter ID PULMONARY-HYPERTENSION; NEWBORN RP GASTON, B (reprint author), USN,MED CTR,DIV PEDIAT CRIT CARE,SAN DIEGO,CA 92134, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU AMER ACAD PEDIATRICS PI ELK GROVE VILLAGE PA 141 NORTH-WEST POINT BLVD, ELK GROVE VILLAGE, IL 60007-1098 SN 0031-4005 J9 PEDIATRICS JI Pediatrics PD JUL PY 1994 VL 94 IS 1 BP 134 EP 135 PG 2 WC Pediatrics SC Pediatrics GA NU544 UT WOS:A1994NU54400040 PM 8008529 ER PT J AU PEREZ, I TYAGI, S AF PEREZ, I TYAGI, S TI MICROWAVE-ABSORPTION MONITORING OF AGING AND THERMAL-CYCLING EFFECTS IN CUPRATE SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID SINGLE-CRYSTAL; YBA2CU3O7-DELTA; FILMS; FIELD AB Using direct and magnetically modulated microwave absorption, aging and thermal-cycling effects have been studied in single crystals and thin epitaxial films of Y1Ba2Cu3O7 fabricated by laser ablation on LaAlO3 substrates. The aging is most likely due to oxygen loss from the surface layers since the aging effects can be nearly completely reversed by isothermally annealing the samples in oxygen. The relevance of these results to the performance of microwave devices is discussed. C1 DREXEL UNIV,DEPT PHYS,PHILADELPHIA,PA 19104. USN,CTR AIR WARFARE,WARMINSTER,PA 18974. NR 19 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUL 1 PY 1994 VL 227 IS 3-4 BP 230 EP 236 DI 10.1016/0921-4534(94)90076-0 PG 7 WC Physics, Applied SC Physics GA NX699 UT WOS:A1994NX69900003 ER PT J AU CARR, TW ERNEUX, T AF CARR, TW ERNEUX, T TI HOPF-BIFURCATION OF THE CLASS-B MULTIMODE LASER SO PHYSICAL REVIEW A LA English DT Article AB We analyze the Risken-Nummendal-Graham-Haken instability occurring in a homogeneously broadened two-level unidirectional ring laser modeled by the Maxwell-Bloch equations. We investigate the class-B limit of these equations, and obtain analytically the bifurcation equation for all time-periodic traveling-wave solutions. Class-B lasers are characterized by slowly decaying oscillatory transients due to the small ration of population to cavity lifetimes; these include a number of practically important lasers such as CO2, solid-state, and semiconductor lasers. We then explore the bifurcation equation and note unusual properties for the direction of bifurcation. Of particlar interest is the condition for a supercritical Hopf bifurcation that contrasts to the known subcritical bifurcation of the single-mode laser. In addition, we examine the small-wave-number limit for the Hopf bifurcation. C1 NORTHWESTERN UNIV,MCCORMICK SCH ENGN & APPL SCI,DEPT ENGN SCI & APPL MATH,EVANSTON,IL 60208. USN,RES LAB,SPECIAL PROJECT NONLINEAR SCI,WASHINGTON,DC 20375. NR 15 TC 4 Z9 4 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL PY 1994 VL 50 IS 1 BP 724 EP 731 DI 10.1103/PhysRevA.50.724 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NX001 UT WOS:A1994NX00100086 ER PT J AU RUBINSTEIN, M DAS, BN KOON, NC CHRISEY, DB HORWITZ, J AF RUBINSTEIN, M DAS, BN KOON, NC CHRISEY, DB HORWITZ, J TI FERROMAGNETIC-RESONANCE STUDIES OF GRANULAR GIANT-MAGNETORESISTIVE MATERIALS SO PHYSICAL REVIEW B LA English DT Article AB Ferromagnetic resonance (FMR) can reveal important information on the size and shape of the ferromagnetic particles which are dispersed in granular giant magnetoresistive (GMR) materials. We have investigated the FMR spectra of three different types of granular GMR material, each with different properties: (1) melt-spun ribbons of Fe5Co15Cu80 and Co20Cu80, (2) thin films Of C020Cu80 produced by pulsed laser deposition, and (3) a granular multilayer film of [Cu(50 angstrom)/Fe(10 angstrom) ] X 50. We interpret the linewidth of these materials in as simple a manner as possible, as a ''powder pattern'' of noninteracting ferromagnetic particles. The linewidth of the melt-spun ribbons is caused by a completely random distribution of crystalline anisotropy axes. The linewidth of these samples is strongly dependent upon the annealing temperature: the linewidth of the as-spun sample is 2.5 kOe (appropriate for single-domain particles) while the linewidth of a melt-spun sample annealed at 900-degrees-C for 15 min is 4.5 kOe (appropriate for larger, multidomain particles). The linewidth of the granular multilayer is attributed to a restricted distribution of shape anisotropies, as expected from a discontinuous multilayer, and is only 0.98 kOe when the applied magnetic field is in the plane of the film. RP RUBINSTEIN, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 35 Z9 36 U1 1 U2 4 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 JUL 1 PY 1994 VL 50 IS 1 BP 184 EP 192 DI 10.1103/PhysRevB.50.184 PG 9 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100024 ER PT J AU SOULEN, RJ FRANCAVILLA, TL FULLERMORA, WW MILLER, MM JOSHI, CH CARTER, WL RODENBUSH, AJ MANLIEF, MD AIZED, D AF SOULEN, RJ FRANCAVILLA, TL FULLERMORA, WW MILLER, MM JOSHI, CH CARTER, WL RODENBUSH, AJ MANLIEF, MD AIZED, D TI EXPLANATION OF THE DISSIPATION OBSERVED IN SEVERAL HIGH-TEMPERATURE SUPERCONDUCTORS USING A MODIFIED AMBEGAOKAR-HALPERIN MODEL SO PHYSICAL REVIEW B LA English DT Article ID BA-CU-O; VORTEX-GLASS SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTORS; COLLECTIVE FLUX CREEP; MAGNETIC-FIELD; PHASE; TRANSITION; MOTION; SILVER AB We have measured the current-voltage (I-V) characteristics of several high-temperature-superconducting materials with widely different morphologies (bulk Ag/Pb-Bi-Sr-Ca-Cu-O tapes, thin films of Y-Ba-Cu-O, and melt-textured, bulk Y-Ba-Cu-O samples). The I-V curves were taken at several magnetic fields ranging from 0 to 8 T. The measurements were carried out at three temperatures (4.2, 27, and 77 K) where the samples were immersed in liquid cryogens to ensure good thermal equilibrium. We compared our experimental results to the predictions of dissipation in superconductors made by the following physical models: modified Ambegaokar-Halperin, flux creep, vortex glass, collective flux creep, and a power law. The fits were extremely good for the first model and were not nearly as good for the others. Using the modified Ambegaokar-Halperin model, the critical current I(c), the normal-state resistance R(n), and gamma, which is proportional to the pinning potential U (H,T), were obtained for each material. Since the Ambegaokar-Halperin model is the only one which uniquely defines I(c), we conclude that its use puts this parameter on a solid physical basis. C1 AMER SUPERCOND CORP, WESTBOROUGH, MA 01581 USA. RP SOULEN, RJ (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 41 TC 44 Z9 44 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1994 VL 50 IS 1 BP 478 EP 487 DI 10.1103/PhysRevB.50.478 PG 10 WC Physics, Condensed Matter SC Physics GA NX871 UT WOS:A1994NX87100059 ER PT J AU WHITNEY, KG DASGUPTA, A PULSIFER, PE AF WHITNEY, KG DASGUPTA, A PULSIFER, PE TI TRANSIENT ULTRAHIGH GAINS AS A DIAGNOSTIC IN SHORT-PULSE HEATED SELENIUM PLASMAS SO PHYSICAL REVIEW E LA English DT Article ID LASER-PRODUCED PLASMAS; INVERSE BREMSSTRAHLUNG; ELECTRON DISTRIBUTIONS; RAY; IONIZATION; ABSORPTION AB The influence of intense picosecond heating and time-dependent ionization on the population dynamics of Ne-like selenium is investigated. We find that highly nonequilibrium plasma conditions and a large gain coefficient > 500 cm-1 can be generated for the J = 0-1 line at 182 angstrom at KrF laser intensities > 3 X 10(16) W/cm2. Thus, the observation of x-ray lasing at or near the critical surface of a KrF short-pulse, laser heated plasma appears feasible. Its observation would provide important tests of theoretical models for laser absorption, heat conductivity, ion heating, transient ionization, and x-ray laser pumping. The calculations in this paper help to define the minimum intensities and energies of the KrF laser that would be needed to carry out these x-ray amplification experiments using 2 ps full width at 1/e maximum pulses. The emission pattern of the amplified x rays would also provide useful diagnostics for the gradient and velocity structure of the blowoff plasma near the critical surface. RP WHITNEY, KG (reprint author), USN,RES LAB,DEPT PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 24 TC 38 Z9 38 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 JUL PY 1994 VL 50 IS 1 BP 468 EP 473 DI 10.1103/PhysRevE.50.468 PG 6 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NZ084 UT WOS:A1994NZ08400060 ER PT J AU TERRY, RE AF TERRY, RE TI ELECTROSTATIC TURBULENCE IN THE Z-PINCH CORONA SO PHYSICS OF PLASMAS LA English DT Article ID PLASMAS AB The microstability of electrostatic waves in the periphery of a Z pinch is formulated and resolved for a new class of Vlasov meta-equilibria admitting self-similar solutions in the electron gyrokinetic limit. These equilibria are subject to strong radial motions, and a mild deviation from charge neutrality arises to maintain ion acceleration close to that of the magnetized electrons. A unique class of profiles in density, axial current, temperature, and drift speed defines these equilibria. They are characterized by (i) the interior pinch current, (ii) the interior number density, (iii) the parallel and perpendicular temperatures, (iv) the exterior axial electric field value at the initial time, and (v) the radial ion acceleration relative to that of the electrons. Unstable ion sound waves arise in this medium by coupling radial and axial free energy to azimuthal longitudinal oscillations. The waves grow only for a limited range of radial or axial E x b/B drift speeds and electron temperatures. The growth rate, which can be as large as 0.115omega(pi), is found to scale proportional to plasma frequency over the density range from 10(12) to 10(18) ions cm-3. RP TERRY, RE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 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 JUL PY 1994 VL 1 IS 7 BP 2189 EP 2199 DI 10.1063/1.870618 PG 11 WC Physics, Fluids & Plasmas SC Physics GA NX009 UT WOS:A1994NX00900012 ER PT J AU IWAMOTO, N AF IWAMOTO, N TI MOLECULAR-DYNAMICS OF POLYBENZIMIDAZOLE AND CONTRIBUTIONS FROM CHAOS SO POLYMER ENGINEERING AND SCIENCE LA English DT Article ID MECHANICS AB Molecular dynamics has been used to study possible dynamic mechanisms that may contribute to the property degradation known to exist for polybenzimidazole (PBI) upon hydration. During this study, chaotic movements of a chain pair were observed. Changes in onset and duration of this movement were also observed, which depended upon both hydration state and stress direction involved. Such trends suggested that specific mechanistic pathways may exist that could directly lead to property (such as modulus) loss. RP IWAMOTO, N (reprint author), USN,CTR WARFARE,DIV WEAPONS,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU SOC PLASTICS ENG INC PI BROOKFIELD CENTER PA 14 FAIRFIELD DR, BROOKFIELD CENTER, CT 06804-0403 SN 0032-3888 J9 POLYM ENG SCI JI Polym. Eng. Sci. PD JUL PY 1994 VL 34 IS 13 BP 1070 EP 1079 DI 10.1002/pen.760341306 PG 10 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA NW469 UT WOS:A1994NW46900005 ER PT J AU KOSTOFF, RN AF KOSTOFF, RN TI RESEARCH IMPACT QUANTIFICATION SO R & D MANAGEMENT LA English DT Article AB A method was developed to quantify the impacts of research. The method is able to identify indirect impacts of research, and the pathways through which they are disseminated. A fully connected network is constructed whose nodes represent research, technology, and mission areas. The total impact of a given research node on any other node is the sum of the impacts (link value products) along every path in the network, and includes research-research, research-technology, and technology-research impacts. A pilot study was performed using a taxonomy of research and development nodes, with the raw input data (the link values) obtained from a survey of experts. An algorithm processed the data to provide total impact results, which are presented here. RP OFF NAVAL RES, 800 N QUINCY ST, ARLINGTON, VA 22217 USA. NR 28 TC 20 Z9 20 U1 0 U2 5 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0033-6807 EI 1467-9310 J9 R&D MANAGE JI R D Manage. PD JUL PY 1994 VL 24 IS 3 BP 207 EP 218 DI 10.1111/j.1467-9310.1994.tb00874.x PG 12 WC Business; Management SC Business & Economics GA NV009 UT WOS:A1994NV00900002 ER PT J AU HACKMAN, RH LIM, R AF HACKMAN, RH LIM, R TI DEVELOPMENT AND APPLICATION OF THE SPHEROIDAL COORDINATE BASED T MATRIX SOLUTION TO ELASTIC-WAVE SCATTERING SO RADIO SCIENCE LA English DT Article ID TRANSLATIONAL ADDITION THEOREMS; HIGH ASPECT RATIO; ACOUSTIC-WAVES; TRANSITION MATRIX; FLUID; ABSORPTION; OBSTACLES; OBJECTS; SCALAR AB A spheroidal coordinate based T matrix formalism is developed for the description of elastic wave scattering from a collection of obstacles embedded in a homogeneous, unbounded medium. The development of the spheroidal formalism for the scattering from a single obstacle is a refinement of the earlier work of Hackman (1984), a discussion of the extension of this approach to a many inclusion system is a generalization of Lim and Hackman (1992). Calculations are presented for the elastic wave scattering from (single) prolate spheroidal and finite cylindrical objects. The single inclusion calculations presented have bearing on a study of anechoic mechanisms in composite materials presented earlier (Lim and Hackman, 1990). C1 USN,CTR SURFACE WARFARE,DAHLGREN DIV,COASTAL SYST STN,PANAMA CITY,FL 32407. RP HACKMAN, RH (reprint author), LOCKHEED PALO ALTO RES LABS,3251 HANOVER ST,PALO ALTO,CA 94304, USA. NR 44 TC 5 Z9 6 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JUL-AUG PY 1994 VL 29 IS 4 BP 1035 EP 1049 DI 10.1029/94RS00973 PG 15 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA PA127 UT WOS:A1994PA12700030 ER PT J AU MOCK, W HOLT, WH AF MOCK, W HOLT, WH TI NONAERODYNAMIC SABOT STRIPPER FOR RESEARCH GAS GUN SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A nonaerodynamic sabot stripper has been designed and implemented for use with a 40.00-mm smooth bore research gas gun. The stripper consists of several metal parts to stop and contain the sabot while allowing the carried object to pass unhindered through it. The single-piece sabot is stopped by impacting replaceable layers of 19-mm-thick aluminum and steel plates and 3.2-mm-thick rubber sheets. The metal plates and rubber sheets have 25.4- and 31.8-mm diam holes, respectively, for passage of the carried object. The sabot stripper is located 230 mm from the muzzle of the gas gun and is aligned before each shot using a special metal fixture that is inserted into the gun muzzle. Cubes measuring 12.7 mm have been launched in a flat-faced orientation. Targets consisting of 76.2 mmX76.2 mm plates of various thicknesses are positioned in an assembly that attaches to the sabot stripper and is located 57 mm behind it. The velocity range for the experiments was from 0.61 to 0.94 km/s. RP MOCK, W (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,DAHLGREN,VA 22448, USA. NR 5 TC 2 Z9 2 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 JUL PY 1994 VL 65 IS 7 BP 2364 EP 2366 DI 10.1063/1.1144689 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NW644 UT WOS:A1994NW64400034 ER PT J AU PATENAUDE, BM AF PATENAUDE, BM TI MOVIES FOR THE MASSES - POPULAR CINEMA AND SOVIET-SOCIETY IN THE 1920S - YOUNGBLOOD,DJ SO RUSSIAN REVIEW LA English DT Book Review RP PATENAUDE, BM (reprint author), NAVAL POSTGRAD SCH,MONTEREY,CA, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU OHIO STATE UNIV PRESS PI COLUMBUS PA 1050 CARMACK RD, COLUMBUS, OH 43210 SN 0036-0341 J9 RUSS REV JI Russ. Rev. PD JUL PY 1994 VL 53 IS 3 BP 460 EP 461 DI 10.2307/131225 PG 2 WC History SC History GA NV627 UT WOS:A1994NV62700039 ER PT J AU BATURIN, D AF BATURIN, D TI NRL ATTACKS HALON REPLACEMENT SO SEA TECHNOLOGY LA English DT Note RP BATURIN, D (reprint author), USN,RES LAB,WASHINGTON,DC 20375, 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 JUL PY 1994 VL 35 IS 7 BP 33 EP 35 PG 3 WC Engineering, Ocean SC Engineering GA NX658 UT WOS:A1994NX65800006 ER PT J AU MORRIS, CE AF MORRIS, CE TI INEQUALITY REEXAMINED - SEN,A SO SOUTHERN ECONOMIC JOURNAL LA English DT Book Review RP MORRIS, CE (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV NORTH CAROLINA PI CHAPEL HILL PA SOUTHERN ECONOMIC JOURNAL, CHAPEL HILL, NC 27514 SN 0038-4038 J9 SOUTHERN ECON J JI South. Econ. J. PD JUL PY 1994 VL 61 IS 1 BP 236 EP 237 DI 10.2307/1060159 PG 2 WC Economics SC Business & Economics GA NX016 UT WOS:A1994NX01600034 ER PT J AU SPRAGUE, JA GILMORE, CM AF SPRAGUE, JA GILMORE, CM TI EFFECTS OF ATOM ENERGY ON METAL-ON-METAL FILM NUCLEATION AND GROWTH SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 8th International Conference on Surface Modification of Metals by Ion Beams CY SEP 13-17, 1993 CL KANAZAWA, JAPAN SP INST PHYS & CHEM RES, IND RES INST ISHIKAWA, JAPANESE SOC SURFACE LAYER MODIFICAT ION IMPLANTAT, BEAM ENGN RES SOC JAPAN, AMADA FDN MET WORK TECHNOL, KANAZAWA CONVENT BUR, JAPAN SOC APPL PHYS, CHEM SOC JAPAN, JAPAN INST MET, JAPAN SOC PRECIS ENGN, IRON & STEEL INST JAPAN, ELECTROCHEM SOC JAPAN, INST ELECT ENGINEERS JAPAN, VACUUM SOC JAPAN, SURFACE SCI SOC JAPAN, SURFACE FINISHING SOC JAPAN ID THIN-FILMS; DEPOSITION; DYNAMICS; AG; AU; PD; FE AB Molecular dynamics simulations of the deposition of f.c.c. metal films on f.c.c. metal substrates have been conducted using embedded-atom potentials. The energies of atoms arriving at the substrate were varied over the range 0.1-40 eV. Substrate-film atom combinations have been chosen to investigate the relationship of relative atomic sizes, atomic masses, and heats of mixing with the effects of atom arrival energy. The results were also compared with experimental data in the literature regarding the epitaxy of f.c.c. metal films on Ag and Cu substrates. In the simulations, the deposition of Pd, Ag, Pt, and Au was studied on Cu substrates, and deposition of Ni, Cu and Ag was examined on Ag substrates. As had been noted previously for simulations of Ag deposition on Ag substrates, atom arrival energies of 10 eV and greater resulted in some film-substrate interface mixing. The present results demonstrated that this interface mixing effect could also be strongly influenced by the chemical thermodynamics of the system. For 10 eV depositions of 4 monolayers on Cu(100) substrates, 1 Ag atom (0.005 ML), 4 Au atoms (0.02 ML), and 30 Pt atoms (0. 1 5 ML) were found mixed into the top substrate layer. Both experimental measurements and calculations using the potentials employed in this study show that, for mixing into a Cu host, the heat of solution is positive for Ag, slightly negative for Au, and significantly negative for Pt (3 times the magnitude for Au). In the investigation of heteroepitaxy, Ni and Cu deposited on Ag(100) substrates grew as (100)-oriented films, with their lattice parameters expanded in the plane of the substrate. For oversize atoms deposited on Cu(100) substrates, it was found that increasing misfit was accommodated by shear along close-packed directions in the plane of the substrate surface, producing stacking faults in the growing film. At sufficiently high misfit, these shear lines merge, producing a (111)-oriented film. It is proposed that the experimental observation that Pd grows on Cu(100) with a (100) orientation while Pt grows on the same substrate with a (111) orientation results from the higher initial density of these faults, which makes it more energetically favorable for dislocations to shear the entire film to the (111) orientation as the thickness increases. C1 GEORGE WASHINGTON UNIV,WASHINGTON,DC 20016. RP SPRAGUE, JA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 5 Z9 5 U1 1 U2 4 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 JUL PY 1994 VL 65 IS 1-3 BP 71 EP 76 DI 10.1016/S0257-8972(94)80011-1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA NX760 UT WOS:A1994NX76000012 ER PT J AU DECREDICO, MA AF DECREDICO, MA TI LIVING MONUMENTS - CONFEDERATE SOLDIERS HOMES IN THE NEW SOUTH - ROSENBURG,RB SO VIRGINIA MAGAZINE OF HISTORY AND BIOGRAPHY LA English DT Book Review RP DECREDICO, MA (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU VIRGINIA HISTORICAL SOC PI RICHMOND PA BOX 7311, RICHMOND, VA 23221 SN 0042-6636 J9 VA MAG HIST BIOG JI VA. Mag. Hist. Biogr. PD JUL PY 1994 VL 102 IS 3 BP 421 EP 422 PG 2 WC History SC History GA QE281 UT WOS:A1994QE28100007 ER PT J AU AKERS, RT AF AKERS, RT TI A BETTER LEGEND - FROM THE WORLD-WAR-II LETTERS OF POULTON,JACK AND POULTON,JANE - POULTON,JW SO VIRGINIA MAGAZINE OF HISTORY AND BIOGRAPHY LA English DT Book Review RP AKERS, RT (reprint author), USN,CTR HIST,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU VIRGINIA HISTORICAL SOC PI RICHMOND PA BOX 7311, RICHMOND, VA 23221 SN 0042-6636 J9 VA MAG HIST BIOG JI VA. Mag. Hist. Biogr. PD JUL PY 1994 VL 102 IS 3 BP 424 EP 425 PG 2 WC History SC History GA QE281 UT WOS:A1994QE28100009 ER PT J AU LEE, JS MILLER, AR HOPPEL, KW AF LEE, JS MILLER, AR HOPPEL, KW TI STATISTICS OF PHASE DIFFERENCE AND PRODUCT MAGNITUDE OF MULTI-LOOK PROCESSED GAUSSIAN SIGNALS SO WAVES IN RANDOM MEDIA LA English DT Article AB The phase difference and the product of two complex Gaussian signals are important parameters in the study of interferometry and polarimetry. To reduce statistical variations, polarimetric and inteferometric radar systems adopted multi-look processing by averaging spatially in the complex interferogram. The statistical characteristics of these two parameters are different from those of the single-look processing. In this paper, we derive their probability density functions (PDFS), and establish their statistical properties. These PDFs are derived from the complex Wishart distribution. The procedures involve multiple integrations of special functions, thus yielding closed-form, easily computable solutions for the PDFS. The multi-look phase difference has a Gauss hypergeometric distribution, and the multi-look product distribution is shown to be a product of two modified Bessel functions. Experimental results using polarimetric synthetic aperture radar (SAR) data of forests indicate good agreement between computed histograms and theoretical distributions. RP LEE, JS (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7232,WASHINGTON,DC 20375, USA. NR 0 TC 40 Z9 41 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0959-7174 J9 WAVE RANDOM MEDIA JI Waves Random Media PD JUL PY 1994 VL 4 IS 3 BP 307 EP 319 DI 10.1088/0959-7174/4/3/006 PG 13 WC Physics, Multidisciplinary SC Physics GA NZ187 UT WOS:A1994NZ18700006 ER PT J AU GUMPERT, BC NOWACKI, MR AMUNDSON, DE AF GUMPERT, BC NOWACKI, MR AMUNDSON, DE TI PULMONARY ALVEOLAR LIPOPROTEINOSIS - REMISSION AFTER ANTIBIOTIC-TREATMENT SO WESTERN JOURNAL OF MEDICINE LA English DT Article ID PROTEINOSIS C1 USN HOSP,DEPT CRIT CARE MED,SAN DIEGO,CA 92134. USN HOSP,DEPT LAB & CLIN INVEST,DIV ANAT PATHOL,SAN DIEGO,CA 92134. RP GUMPERT, BC (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU CALIFORNIA PHYSICIAN MAGAZINE PI SAN FRANCISCO PA C/O DONNA TAYLOR, EDITOR, PO BOX 7690, SAN FRANCISCO, CA 94102-7690 SN 0093-0415 J9 WESTERN J MED JI West. J. Med. PD JUL PY 1994 VL 161 IS 1 BP 66 EP 68 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA NY526 UT WOS:A1994NY52600017 PM 7941518 ER PT J AU BACKE, H GAMPERT, S GRENDEL, A HARTMANN, HJ LAUTH, W WEINHEIMER, C ZAHN, R BUSKIRK, FR EUTENEUR, H KAISER, KH STEPHAN, G WALCHER, T AF BACKE, H GAMPERT, S GRENDEL, A HARTMANN, HJ LAUTH, W WEINHEIMER, C ZAHN, R BUSKIRK, FR EUTENEUR, H KAISER, KH STEPHAN, G WALCHER, T TI RESONANT TRANSITION RADIATION IN THE X-RAY REGION FROM A LOW-EMITTANCE 855 MEV ELECTRON-BEAM SO ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI LA English DT Article ID MYLAR AB The interference of transition radiation coherently produced from a periodic stack of four polyimide foils of 7.2 mum thickness and a separation of 162 mum was investigated. This stack has been brought into the low emittance (3 pi nm rad) electron beam of the 855 MeV Mainz Microtron MAMI. Transition radiation was observed in the energy range from 2 to 15 keV with a LN2-cooled pin photodiode. A good energy resolution of 0.8 keV and angular resolution of 0.15 mrad was achieved simultaneously allowing for the first time to quantitatively study the interference pattern. Good agreement with theoretical calculations is found. Prospects to exploit transition radiation in the x-ray region from a low emittance electron beam as a high brilliant radiation source are discussed. C1 UNIV MAINZ,INST KERNPHYS,D-55099 MAINZ,GERMANY. USN,POSTGRAD SCH,MONTEREY,CA 93943. RP BACKE, H (reprint author), UNIV MAINZ,INST PHYS,D-55099 MAINZ,GERMANY. NR 17 TC 20 Z9 20 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0939-7922 J9 Z PHYS A-HADRON NUCL JI Z. Phys. A.-Hadrons Nuclei PD JUL PY 1994 VL 349 IS 1 BP 87 EP 92 DI 10.1007/BF01296337 PG 6 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA PA338 UT WOS:A1994PA33800015 ER PT J AU DAHMANI, R SALAMANCARIBA, L NGUYEN, NV CHANDLERHOROWITZ, D JONKER, BT AF DAHMANI, R SALAMANCARIBA, L NGUYEN, NV CHANDLERHOROWITZ, D JONKER, BT TI STRAIN EFFECTS ON THE ENERGY-BANDS OF ZNSE FILMS GROWN ON GAAS SUBSTRATES BY SPECTROSCOPIC ELLIPSOMETRY SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; P-TYPE ZNSE; SEMICONDUCTOR HETEROSTRUCTURES; PHOTOMODULATED REFLECTIVITY; STRUCTURAL-PROPERTIES; LAYER SUPERLATTICES; LATTICE-MISMATCH; LASER-DIODES; ZNSE/GAAS; EPILAYERS AB Room-temperature spectroscopic ellipsometry measurements were carried out on ZnSe thin films grown on (001)GaAs substrates by molecular-beam epitaxy for the study of the lattice mismatch-induced strain at the interface. The magnitude of the absorption coefficient at the E0+DELTA0 critical point is very sensitive to the strain in the film. The variation in the magnitude of the absorption coefficient is used to estimate the critical thickness for the onset of dislocation generation. Almost complete relaxation of the films was obtained for thicknesses higher than 500 nm. Also, the strain-induced coupling between the valence subbands was found to cause additional shifting of the light-hole subband. C1 UNIV MARYLAND,DEPT MAT ENGN,COLL PK,MD 20742. UNIV MARYLAND,DEPT NUCL ENGN,COLL PK,MD 20742. NIST,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899. USN,RES LAB,WASHINGTON,DC 20375. RP DAHMANI, R (reprint author), UNIV MARYLAND,DEPT CHEM PHYS,COLL PK,MD 20742, USA. RI Salamanca-Riba, Lourdes/B-3785-2009 OI Salamanca-Riba, Lourdes/0000-0001-8155-6403 NR 30 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 27 PY 1994 VL 64 IS 26 BP 3620 EP 3622 DI 10.1063/1.111223 PG 3 WC Physics, Applied SC Physics GA NU155 UT WOS:A1994NU15500033 ER PT J AU FU, TC SHEKARRIZ, A KATZ, J HUANG, TT AF FU, TC SHEKARRIZ, A KATZ, J HUANG, TT TI THE FLOW STRUCTURE IN THE LEE OF AN INCLINED 6/1 PROLATE SPHEROID SO JOURNAL OF FLUID MECHANICS LA English DT Article ID PROJECTILE; TOPOLOGY AB Particle displacement velocimetry is used to measure the velocity and vorticity distributions around an inclined 6:1 prolate spheroid. The objective is to determine the effects of boundary-layer tripping, incidence angle, and Reynolds number on the flow structure. The vorticity distributions are also used for computing the lateral forces and rolling moments that occur when the flow is asymmetric. The computed forces agree with results of direct measurements. It is shown that when the flow is not tripped, separation causes the formation of a pair of vortex sheets. The size of these sheets increases with increasing incidence angle and axial location. Their orientation and internal vorticity distribution also depend on incidence. Rollup into distinct vortices occurs in some cases, and the primary vortex contains between 20 % and 50 % of the overall circulation. The entire flow is unsteady and there are considerable variations in the instantaneous vorticity distributions. The remainder of the lee side, excluding these vortex sheets, remains almost vorticity free, providing clear evidence that the flow can be characterized as open separation. Boundary-layer tripping causes earlier separation on part of the model, brings the primary vortex closer to the body, and spreads the vorticity over a larger region. The increased variability in the vorticity distribution causes considerable force fluctuations, but the mean loads remain unchanged. Trends with increasing Reynolds number are conflicting, probably because of boundary-layer transition. The separation point moves towards the leeward meridian and the normal force decreases when the Reynolds number is increased from 0.42 x 10(6) to 1.3 x 10(6). Further increase in the Reynolds number to 2.1 x 10(6) and tripping cause an increase in forces and earlier separation. C1 NSWC,CD,DAVID TAYLOR MODEL BASIN,BETHESDA,MD 20084. RP FU, TC (reprint author), JOHNS HOPKINS UNIV,DEPT MECH ENGN,BALTIMORE,MD 21218, USA. RI Katz, Joseph/A-7624-2010 OI Katz, Joseph/0000-0001-9067-2473 NR 21 TC 11 Z9 11 U1 0 U2 0 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 JUN 25 PY 1994 VL 269 BP 79 EP 106 DI 10.1017/S0022112094001497 PG 28 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NW497 UT WOS:A1994NW49700004 ER PT J AU GRIFFITH, WC YANTA, WJ RAGSDALE, WC AF GRIFFITH, WC YANTA, WJ RAGSDALE, WC TI SUPERCOOLING IN HYPERSONIC NITROGEN WIND TUNNELS SO JOURNAL OF FLUID MECHANICS LA English DT Article AB Recent experimental observation of supercooling in large hypersonic wind tunnels using pure nitrogen identified a broad range of non-equilibrium metastable vapour states of the flow in the test cell. To investigate this phenomenon a number of real-gas effects are analysed and compared with predictions made using the ideal-gas equation of state and equilibrium thermodynamics. The observed limit on the extent of supercooling is found to be at 60 % of the temperature difference from the sublimation line to Gibbs' absolute limit on phase stability. The mass fraction then condensing is calculated to be 12-14 %. Included in the study are virial effects, quantization of rotational and vibrational energy, and the possible role of vibrational relaxation and freezing in supercooling. Results suggest that use of the supercooled region to enlarge the Mach-Reynolds number test envelope may be practical. Data from model tests in supercooled flows support this possibility. C1 USN,SURFACE WARFARE CTR WHITE OAK,AERODYNAM BRANCH,SILVER SPRING,MD 20903. RP GRIFFITH, WC (reprint author), N CAROLINA STATE UNIV,MARS MISSION RES CTR,RALEIGH,NC 27695, USA. NR 24 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 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD JUN 25 PY 1994 VL 269 BP 283 EP 299 DI 10.1017/S0022112094001564 PG 17 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NW497 UT WOS:A1994NW49700011 ER PT J AU CARRUTHERS, TF DULING, IN DENNIS, ML AF CARRUTHERS, TF DULING, IN DENNIS, ML TI ACTIVE-PASSIVE MODELOCKING IN A SINGLE-POLARIZATION ERBIUM FIBER LASER SO ELECTRONICS LETTERS LA English DT Article DE FIBER LASERS; LASER MODE LOCKING; HIGH-SPEED OPTICAL TECHNIQUES ID MODE-LOCKING; FIBER AB Subpicosecond pulses have been generated in an actively modelocked, polarisation-maintaining Er-doped fibre ring laser. A single-polarisation fibre amplifier and an uncompensated polarisation bias section are integrated into the laser. This laser combines the nonlinear pulse-shortening mechanism of polarisation-rotation lasers and the single-polarisation operation, environmental insensitivity, and capacity for active modelocking characteristic of unidirectional single-polarisation ring lasers. RP CARRUTHERS, TF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 35 Z9 36 U1 0 U2 4 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD JUN 23 PY 1994 VL 30 IS 13 BP 1051 EP 1053 DI 10.1049/el:19940691 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA NW774 UT WOS:A1994NW77400026 ER PT J AU PACE, MD AF PACE, MD TI SPIN-TRAPPING OF NITROGEN-DIOXIDE FROM PHOTOLYSIS OF SODIUM-NITRITE, AMMONIUM-NITRATE, AMMONIUM DINITRAMIDE, AND CYCLIC NITRAMINES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article AB Nitrogen dioxide (NO2.), pruduced I;y photodecomposition (lambda > 200 nm) of polycrystalline sodium nitrite (Na+NO2-), polycrystalline energetic oxidizers, ammonium nitrate (NH4+NO3-), and ammonium dinitramide [NH4+N(NO2)(2)(-)], and the polycrystalline cyclic nitramine cyclotrimethylenetrinitramine (RDX), was studied by electron spin resonance (ESR) spin trapping at room temperature (300 K) and by matrix isolation ESR spectroscopy at 77 K. In spin trapping experiments, the aci anion of nitromethane (CH2=NO2-) was used to spin trap NO2. produced by photodecomposition of these energetic compounds in basic (pH > 13) aqueous solutions at room temperature. The resulting NO2. adduct radical is the dinitromethyl anion radical (DNM(.)) ((NO2)-N---CH=NO2.-) which gives a 10-line ESR spectrum. For equimolar starting concentrations of each compound, the ESR signal;intensities of the DNM(.) spectrum varied according to NaNO2 > NH4N(NO2)(2) > NH4NO3 > RDX. From kinetics of DNM(.) formation, the suggested dominant mechanisms of NO2. formation are NO2- + OH. - NO2. + OH- for compounds NaNO2 and RDX and NO3- --> NO2. + O- for NH4NO3 and NH4N(NO2)(2). Two Other cyclic-nitramines, cyclotetramethylenetetranitramine (HMX) and hexanitrohexaazaisowurtzitane (HNIW), were confirmed to give weak DNM(.) adduct ESR signals. In matrix isolation ESR experiments at 77 K, the rate of formation of NO2. is zero-order for NaNO2 and NH4NO3 but first-order for NH4N(NO2)(2) under the photolysis conditions of this experiment, suggesting that, in the solid phase, NO2. is formed by different mechanisms in the two ammonium salts. RP PACE, MD (reprint author), USN,RES LAB,CODE 6120,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 18 TC 23 Z9 24 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 23 PY 1994 VL 98 IS 25 BP 6251 EP 6257 DI 10.1021/j100076a004 PG 7 WC Chemistry, Physical SC Chemistry GA NU587 UT WOS:A1994NU58700004 ER PT J AU JOHNSON, JK MULLER, EA GUBBINS, KE AF JOHNSON, JK MULLER, EA GUBBINS, KE TI EQUATION OF STATE FOR LENNARD-JONES CHAINS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MONTE-CARLO SIMULATIONS; PHASE-EQUILIBRIA; POLYMER MELTS; MOLECULAR THERMODYNAMICS; CHEMICAL ASSOCIATION; FLUID MIXTURES; HIGH-DENSITIES; SIMPLE-MODELS; IONIC FLUIDS; SYSTEMS AB An equation of state for chains composed of tangent, freely jointed Lennard-Jones spheres is presented. The equation is based on a statistical mechanical description of polymerization that is based on Wertheim's theory of associating fluids. The Helmholtz free energy of a fluid of chains is expressed as the contribution from a monomeric reference fluid, which in this case is a fluid of Lennard-Jones spheres, plus a contribution due to bonding. The bonding term depends upon the number of monomers in a chain and the cavity correlation function of the reference fluid. We have performed molecular dynamics simulations of chain fluids composed of 2, 4, 12, 16, 18, 20, 50, and 100 spheres over the entire fluid density range at several temperatures and compared the results to the theory. The equation of state is found to be in good agreement with the simulation results, predicting pressures that are slightly too large overall. Internal energies are predicted well, except in the low-density region where the equation of state does not give the correct limiting value due to neglect of chain self-interaction. C1 CORNELL UNIV,SCH CHEM ENGN,ITHACA,NY 14853. RP JOHNSON, JK (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Muller, Erich/D-3760-2015; Johnson, Karl/E-9733-2013 OI Muller, Erich/0000-0002-1513-6686; Johnson, Karl/0000-0002-3608-8003 NR 49 TC 186 Z9 187 U1 1 U2 28 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 23 PY 1994 VL 98 IS 25 BP 6413 EP 6419 DI 10.1021/j100076a028 PG 7 WC Chemistry, Physical SC Chemistry GA NU587 UT WOS:A1994NU58700028 ER PT J AU TWIGG, ME BENNETT, BR SHANABROOK, BV WATERMAN, JR DAVIS, JL WAGNER, RJ AF TWIGG, ME BENNETT, BR SHANABROOK, BV WATERMAN, JR DAVIS, JL WAGNER, RJ TI INTERFACIAL ROUGHNESS IN INAS GASB SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID INAS/GASB SUPERLATTICES AB Using high-resolution transmission electron microscopy (HRTEM), we have studied InAs/GaSb superlattices grown by molecular beam epitaxy. Our HRTEM observations indicate that the apparent interface width is on the order of 1 monolayer for InSb-like interfaces, and on the order of 2 monolayers for GaAs-like interfaces. The combination of these results with x-ray diffraction and Raman scattering measurements leads us to conclude that these interface widths are principally due to roughness rather than to interfacial diffusion. 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 15 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 20 PY 1994 VL 64 IS 25 BP 3476 EP 3478 DI 10.1063/1.111245 PG 3 WC Physics, Applied SC Physics GA NT353 UT WOS:A1994NT35300038 ER PT J AU IDZERDA, YU CHEN, CT CHENG, SF VAVRA, W PRINZ, GA MEIGS, G LIN, HJ HO, GH AF IDZERDA, YU CHEN, CT CHENG, SF VAVRA, W PRINZ, GA MEIGS, G LIN, HJ HO, GH TI EXTRACTION OF THE COEFFICIENT OF GIANT MAGNETORESISTANCE SO APPLIED PHYSICS LETTERS LA English DT Article ID MAGNETIC-CIRCULAR-DICHROISM; ULTRATHIN FILMS; SANDWICHES; MULTILAYERS; DEPENDENCE; NICKEL AB Element specific magnetic hysteresis (ESMH) loops have been used in conjunction with measured magnetoresistance curves to extract the coefficient of giant magnetoresistance (GMR), which is the maximum achievable value of the GMR independent of magnetic domain effects and incomplete moment alignment effects, for sputtered Fe/Cu/Co sandwiches on silicon substrates. Using the ESMH loops to calculate GMR curves, comparison with the measured GMR curves shows that the magnetization reversal process is best described by multidomain Ising behavior. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 11 Z9 12 U1 0 U2 0 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 JUN 20 PY 1994 VL 64 IS 25 BP 3503 EP 3505 DI 10.1063/1.111254 PG 3 WC Physics, Applied SC Physics GA NT353 UT WOS:A1994NT35300047 ER PT J AU AGASSI, D RESTORFF, JB AF AGASSI, D RESTORFF, JB TI PSEUDOPOTENTIAL BAND CALCULATIONS ALONG A SYMMETRY AXIS - SPIN-ORBIT INTERACTION SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID PBSE; PBTE AB A convergent method for local pseudopotential band structure calculations, based on a cylindrical coordinate multipole expansion, is generalized to include the spin-orbit interaction. The generalization is necessary for systems that are highly anisotropic and where the spinorbit interaction is essential, e.g., narrow-gap semiconductor superlattices. The coupled wave equations for the corresponding multipoles are derived and applied to a test case: the low bands of PbSe along the [111] direction. The calculated bands compare well with the PbSe band structure. RP AGASSI, D (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 19 TC 0 Z9 0 U1 0 U2 1 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 JUN 20 PY 1994 VL 6 IS 25 BP 4673 EP 4684 DI 10.1088/0953-8984/6/25/006 PG 12 WC Physics, Condensed Matter SC Physics GA NT763 UT WOS:A1994NT76300006 ER PT J AU FLIPPENANDERSON, JL KONY, M DAGLEY, IJ AF FLIPPENANDERSON, JL KONY, M DAGLEY, IJ TI A HIGH-DENSITY THERMALLY STABLE EXPLOSIVE - OCTAHYDRO-2,5-BIS(NITROIMINO)IMIDAZO[4,5-D]IMIDAZOLE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The title compound, C4H6N8O4, has a calculated crystal density of 1.84 Mg m-3. It lies on a crystallographic twofold axis passing through the midpoint of the C4-C4i bond [symmetry code: (i) -x, -y, z]. The five-membered ring has a flattened envelope conformation with C4 lying 0.17 angstrom out of the plane of the other four atoms. The geometry at one of the ring N atoms (N1) is planar and that at the other (N3) is slightly pyramidal. There is a cis junction between the fused five-membered rings (H-C-C-H = - 13.1-degrees) with a dihedral angle of 62.7-degrees between the ring planes. The hydrogen-bonding system contains one intra-intermolecular bifurcated bond and one linear intermolecular bond. C1 DSTO,MAT RES LAB,MELBOURNE,VIC 3032,AUSTRALIA. RP FLIPPENANDERSON, JL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 3 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD JUN 15 PY 1994 VL 50 BP 974 EP 976 DI 10.1107/S010827019400048X PN 6 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA NT509 UT WOS:A1994NT50900059 ER PT J AU TURNER, NH SCHREIFELS, JA AF TURNER, NH SCHREIFELS, JA TI SURFACE-ANALYSIS - X-RAY PHOTOELECTRON-SPECTROSCOPY AND AUGER-ELECTRON SPECTROSCOPY SO ANALYTICAL CHEMISTRY LA English DT Review ID CORE-LEVEL PHOTOEMISSION; DEPTH DISTRIBUTION FUNCTION; SELF-ASSEMBLED MONOLAYERS; LANGMUIR-BLODGETT-FILMS; SHAKE-UP SPECTRA; TOUGAARD BACKGROUND SUBTRACTION; ACCURATE INTENSITY CALIBRATION; SCANNING TUNNELING MICROSCOPY; CYLINDRICAL MIRROR ANALYZER; VALENCE-BAND INTERPRETATION C1 GEORGE MASON UNIV, DEPT CHEM, FAIRFAX, VA 22030 USA. RP TURNER, NH (reprint author), USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 466 TC 11 Z9 11 U1 1 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD JUN 15 PY 1994 VL 66 IS 12 BP R163 EP R185 PG 23 WC Chemistry, Analytical SC Chemistry GA NR444 UT WOS:A1994NR44400008 PM 8092463 ER PT J AU KELLEY, MJ SNIDER, RH BECKER, KL JOHNSON, BE AF KELLEY, MJ SNIDER, RH BECKER, KL JOHNSON, BE TI SMALL-CELL LUNG-CARCINOMA CELL-LINES EXPRESS MESSENGER-RNA FOR CALCITONIN AND ALPHA-CALCITONIN AND BETA-CALCITONIN GENE-RELATED PEPTIDES SO CANCER LETTERS LA English DT Article DE CALCITONIN; CALCITONIN GENE RELATED PEPTIDE; LUNG NEOPLASM; TUMOR CELL LINES; MESSENGER-RNA; RADIOIMMUNOASSAY; NEUROPEPTIDE ID DORSAL-ROOT GANGLION; CGRP MESSENGER-RNAS; BINDING; IDENTIFICATION; LOCALIZATION; SEQUENCES; PROTEINS; ENHANCER AB Calcitonin (CT) and calcitonin gene related peptide (CGRP) are derived from preprohormones encoded by three mRNAs (CT, alpha-CGRP and beta-CGRP) from two genes (CALC1 and CALC2) on chromosome 11. Among 16 small cell lung cancer cell lines examined by RNase protection assay, 9 (56%) had detectable CT mRNA, 8 (50%) had alpha-CGRP mRNA, and 13 (81%) had beta-CGRP mRNA. At least one CALC1 transcript (CT or alpha-CGRP) was found in 11 (69%) cell lines with three having only CT mRNA, two having only alpha-CGRP mRNA, and six having both. beta-CGRP mRNA was detected in all of these 11 cell lines expressing a CALC1 transcript. Immunoreactive CT was detected by radioimmunoassay in eight of nine SCLC cell lines expressing CT mRNA, and immunoreactive CGRP was detected in 12 of 13 cell lines expressing a CGRP mRNA. The variety of expression of these three peptides in different cell lines of the same cell type should provide a useful system for further study of the control of expression of these peptides. C1 VET AFFAIRS MED CTR,WASHINGTON,DC 20422. GEORGE WASHINGTON UNIV,WASHINGTON,DC 20037. RP KELLEY, MJ (reprint author), NCI,USN,MED ONCOL BRANCH,BLDG 8,ROOM 5101,BETHESDA,MD 20889, USA. OI Kelley, Michael/0000-0001-9523-6080 NR 23 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3835 J9 CANCER LETT JI Cancer Lett. PD JUN 15 PY 1994 VL 81 IS 1 BP 19 EP 25 DI 10.1016/0304-3835(94)90159-7 PG 7 WC Oncology SC Oncology GA NV118 UT WOS:A1994NV11800004 PM 8019984 ER PT J AU PHILLIPS, JL BALOGH, A BAME, SJ GOLDSTEIN, BE GOSLING, JT HOEKSEMA, JT MCCOMAS, DJ NEUGEBAUER, M SHEELEY, NR WANG, YM AF PHILLIPS, JL BALOGH, A BAME, SJ GOLDSTEIN, BE GOSLING, JT HOEKSEMA, JT MCCOMAS, DJ NEUGEBAUER, M SHEELEY, NR WANG, YM TI ULYSSES AT 50-DEGREES SOUTH - CONSTANT IMMERSION IN THE HIGH-SPEED SOLAR-WIND SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID HELIOSPHERIC CURRENT SHEET; SECTOR STRUCTURE; EVOLUTION; CYCLE AB We present speed observations from the Ulysses solar wind plasma experiment through 50-degrees south latitude. The pronounced speed modulation arising from solar rotation and the tilt of the heliomagnetic current sheet has nearly disappeared. Ulysses is now observing wind speeds in the 700 to 800 km s-1 range, with a magnetic polarity indicating an origin in the large south polar coronal hole. The strong compressions, rarefactions, and shock waves previously seen have weakened or disappeared. Occasional coronal mass ejections characterized by low plasma density caused by radial expansion have been observed. The coronal configuration was simple and stable in 1993, indicating that the observed solar wind changes were caused by increasing spacecraft latitude. Trends in prevailing speed with increasing latitude support previous findings. A decrease in peak speed southward of 40-degrees latitude may indicate that the fastest solar wind comes from the equatorial extensions of the polar coronal holes. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. JET PROP LAB,PASADENA,CA 91109. STANFORD UNIV,ERL 322 CSSA,STANFORD,CA 94305. USN,RES LAB,CODE 7672,WASHINGTON,DC 20375. RP PHILLIPS, JL (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 16 TC 98 Z9 98 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 JUN 15 PY 1994 VL 21 IS 12 BP 1105 EP 1108 DI 10.1029/94GL01065 PG 4 WC Geosciences, Multidisciplinary SC Geology GA NT217 UT WOS:A1994NT21700002 ER PT J AU RENDELL, RW AF RENDELL, RW TI ROLE OF DYNAMICAL COOPERATIVITY FOR AN ENHANCED ISOTOPE EFFECT DURING TRANSPORT SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DISPERSIVE DIFFUSION TRANSPORT; DEUTERIUM-ANNEALED OXIDES; INTERFACE TRAP FORMATION; TIME-DEPENDENCE; COUPLING MODEL; RESONANT ACTIVATION; FIELD; RELAXATION; HYDROGEN; IRRADIATION AB The effect of particle-lattice interactions on the hopping of particles over a barrier in a double-well system is studied within a simple microscopic model. The probability of escape becomes modified by the slow dynamics of the lattice and results in nonexponential relaxation. The macroscopic relaxation time is related to the local hopping time by a type of scaling relation which has been experimentally observed in a wide range of relaxation phenomena. In particular, the scaling relation is consistent with an enhanced isotope effect recently observed in comparing hydrogen and deuterium dispersive transport in irradiated metal-oxide-semiconductor devices. In these systems, the hydrogen locally deforms the oxide lattice as it hops and the evidence for a connection with the type of mechanism studied is discussed. The existence of a scaled relaxation time in the present model is demonstrated from numerical solutions and this is supported by the analytic properties of the kinetic equations for this class of systems. RP RENDELL, RW (reprint author), USN,RES LAB,CODE 6813,WASHINGTON,DC 20375, USA. NR 43 TC 6 Z9 6 U1 1 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 JUN 15 PY 1994 VL 75 IS 12 BP 7626 EP 7632 DI 10.1063/1.356593 PG 7 WC Physics, Applied SC Physics GA NQ986 UT WOS:A1994NQ98600002 ER PT J AU RAO, MV DIETRICH, HB KLEIN, PB FATHIMULLA, A SIMONS, DS CHI, PH AF RAO, MV DIETRICH, HB KLEIN, PB FATHIMULLA, A SIMONS, DS CHI, PH TI ION-IMPLANTATION INTO (X11)A-ORIENTED INP AND GAAS (X-LESS-THAN-OR-EQUAL-TO-4) SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CRYSTAL ORIENTATION DEPENDENCE; BEAM-EPITAXIAL-GROWTH; GALLIUM-ARSENIDE; PHOTO-LUMINESCENCE; SI; ACCEPTOR; FE; IDENTIFICATION; SUPERLATTICES; COMPENSATION AB Si, Ge, and Be implantations were performed into (x11)A-oriented semi-insulating InP and GaAs substrates for x less-than-or-equal-to 4. For comparison some of the implantations were also performed into (110)- and (100)-oriented substrates. For 200 keV/5 X 10(13) cm-2 Si and 200 keV/3 X 10(13) cm-2 Ge implants after 850-degrees-C/7 s annealing, the InP is always n type with similar sheet resistance independent of the substrate orientation. No in-diffusion of Si or Ge was observed after annealing for any substrate orientation. Similar behavior was observed for Si implants in GaAs and for Si/B co-implants in both InP and GaAs. Photoluminescence measurements were performed on the Si- and Si/B-implanted InP and GaAs. For 30 keV/1.5 X 10(14) cm-2 Be implants in both InP and GaAs, the in-diffusion of Be in (311)A-oriented substrates is less compared to the (100) material. C1 USN,RES LAB,WASHINGTON,DC 20375. ALLIED SIGNAL TECHNOL CTR,COLUMBIA,MD 21045. GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP RAO, MV (reprint author), SFA INC,LANDOVER,MD 20789, USA. NR 28 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1994 VL 75 IS 12 BP 7774 EP 7778 DI 10.1063/1.356612 PG 5 WC Physics, Applied SC Physics GA NQ986 UT WOS:A1994NQ98600020 ER PT J AU PINTO, JF ESTEROWITZ, L ROSENBLATT, GH AF PINTO, JF ESTEROWITZ, L ROSENBLATT, GH TI TM3+YLF LASER CONTINUOUSLY TUNABLE BETWEEN 2.20 AND 2.46 MU-M SO OPTICS LETTERS LA English DT Article ID FIBER LASER; TEMPERATURE AB Room-temperature, continuous-wave laser action at 2.3 mum corresponding to the H-3(4)-H-3(5) transition in Tm3+-doped YLF is achieved. Output powers of 200 mW and a slope efficiency of 15% have been obtained for a pump power of 2 W at 0.78 mum. In addition, continuous tunability of this laser from 2.20 to 2.46 mum is obtained. C1 SFA INC,LANDOVER,MD 20785. RP PINTO, JF (reprint author), USN,RES LAB,CODE 5641,WASHINGTON,DC 20375, USA. NR 10 TC 33 Z9 35 U1 1 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 JUN 15 PY 1994 VL 19 IS 12 BP 883 EP 885 DI 10.1364/OL.19.000883 PG 3 WC Optics SC Optics GA NQ386 UT WOS:A1994NQ38600011 PM 19844476 ER PT J AU SUBRAMANIAN, S SOORYAKUMAR, R PRINZ, GA JONKER, BT IDZERDA, YU AF SUBRAMANIAN, S SOORYAKUMAR, R PRINZ, GA JONKER, BT IDZERDA, YU TI ELASTIC-CONSTANTS OF BODY-CENTERED-CUBIC COBALT FILMS SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-ANISOTROPY; BCC COBALT; EPITAXIAL-GROWTH; SUPERLATTICES; CO; MULTILAYERS AB The wave-vector and directional dependence of the Rayleigh elastic wave localized in epitaxial films of bcc cobalt are measured by Brillouin scattering. The Rayleigh velocities are well described by elastic continuum theory and yield values for the C-11 and C44 elastic constants that are reduced to about 65% of the corresponding values in the thermodynamically stable hcp configuration. While the reduction in C-11, in these supported films (several hundred angstroms thick) is consistent with recent calculations for bulk bcc cobalt, the C44 and C-12 values we have derived are significantly smaller than those predicted by the theory. The C(ij)'s determined independently from the Rayleigh wave dispersion along distinct crystallographic directions in films of different orientations agree well. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SUBRAMANIAN, S (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. NR 20 TC 15 Z9 15 U1 0 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 JUN 15 PY 1994 VL 49 IS 24 BP 17319 EP 17324 DI 10.1103/PhysRevB.49.17319 PG 6 WC Physics, Condensed Matter SC Physics GA NW027 UT WOS:A1994NW02700049 ER PT J AU LIU, AY SINGH, DJ KRAKAUER, H AF LIU, AY SINGH, DJ KRAKAUER, H TI LINEARIZED-AUGMENTED-PLANE-WAVE METHOD WITH CAR-PARRINELLO SCALING SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; MOLECULAR-DYNAMICS; BRILLOUIN-ZONE; SPECIAL POINTS; TOTAL ENERGY; PSEUDOPOTENTIALS; FORCES; SYSTEMS AB Results from a projector-basis implementation of the linearized-augmented-plane-wave (LAPW) method for calculating electronic structure with Car-Parrinello-like scaling are presented. Total-energy calculations for Cu, O, and Mo are used to demonstrate the accuracy of the scheme. Timings for supercells containing up to 64 Mo atoms show that the computational efficiency of the method exceeds that of the conventional LAPW method for large systems. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23187. RI Singh, David/I-2416-2012; Liu, Amy/E-2266-2015; OI Liu, Amy/0000-0002-2011-1854; Krakauer, Henry/0000-0003-2517-0957 NR 22 TC 1 Z9 1 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 JUN 15 PY 1994 VL 49 IS 24 BP 17424 EP 17427 DI 10.1103/PhysRevB.49.17424 PG 4 WC Physics, Condensed Matter SC Physics GA NW027 UT WOS:A1994NW02700062 ER PT J AU VANDERMEER, RA JENSEN, DJ AF VANDERMEER, RA JENSEN, DJ TI ON THE ESTIMATION OF CAHN-HAGEL INTERFACE MIGRATION RATES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID RECRYSTALLIZATION C1 RISO NATL LAB,DK-4000 ROSKILDE,DENMARK. RP VANDERMEER, RA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Juul Jensen, Dorte/0000-0001-5096-6602 NR 19 TC 15 Z9 15 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN 15 PY 1994 VL 30 IS 12 BP 1575 EP 1580 DI 10.1016/0956-716X(94)90311-5 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NE943 UT WOS:A1994NE94300015 ER PT J AU LAMBERT, RJ BHAR, TN HUGHES, HL AF LAMBERT, RJ BHAR, TN HUGHES, HL TI EFFECT OF AN AUGMENTED OXYGEN IMPLANT ON ELECTRON TRAPPING IN BURIED OXIDES SO APPLIED PHYSICS LETTERS LA English DT Article ID RADIATION; SIO2 AB Standard silicon on insulator wafers were prepared by separation by implantation of oxygen. The standard implant of 1.8 X 10(18) O+ cm-2 was augmented by an additional implant of 10(17) O+ cm-2. The effect of this augmented implantation of oxygen on electron trap density and cross section was investigated using avalanche injection of electrons into the buried oxide. The shift in the high-frequency capacitance-voltage curve was monitored as a function of injected charge. Analysis of the mid-gap voltage shift versus charge shows no change in the effective density of electron traps. There is a factor of 6.8 decrease in the capture cross section for samples that received the supplemental oxygen implantation. C1 UNIV DIST COLUMBIA, WASHINGTON, DC 20008 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 9 TC 9 Z9 9 U1 3 U2 4 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 13 PY 1994 VL 64 IS 24 BP 3291 EP 3292 DI 10.1063/1.111313 PG 2 WC Physics, Applied SC Physics GA NQ979 UT WOS:A1994NQ97900030 ER PT J AU WALLACE, MR YOUSIF, AA HABIB, NF TRIBBLE, DR AF WALLACE, MR YOUSIF, AA HABIB, NF TRIBBLE, DR TI AZITHROMYCIN AND TYPHOID SO LANCET LA English DT Letter C1 USN,CTR MED,DEPT CLIN INVEST,SAN DIEGO,CA 92134. SALMANLYA MED CTR,MANAMA,BAHRAIN. USN,MED RES UNIT 3,CAIRO,EGYPT. RP WALLACE, MR (reprint author), USN,CTR MED,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 5 TC 8 Z9 8 U1 0 U2 0 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD JUN 11 PY 1994 VL 343 IS 8911 BP 1497 EP 1498 DI 10.1016/S0140-6736(94)92604-2 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA NQ415 UT WOS:A1994NQ41500029 PM 7911192 ER PT J AU ROSENBERG, A DILELLA, DP AF ROSENBERG, A DILELLA, DP TI ANOMALOUSLY ENHANCED RAMAN-SCATTERING FROM C-60 ON AG SURFACES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; RESONANCE-RAMAN; C-60; SILVER; FILMS; SPECTROSCOPY; SPECTRA; C-70 AB Raman spectra have been obtained for sub-ML coverages of C60 on cold-deposited Ag surfaces. The enhancement of these spectra persists upon annealing of the surfaces to almost-equal-to 300 K, unlike typical surface-enhanced Raman scattering (SERS) spectra. After annealing, the C60 spectra have an excitation profile different both from that of SERS and from that of resonant Raman scattering in bulk C60. Thus, the enhancement of the C60 spectra on the annealed Ag surfaces is inconsistent with SERS but may be the result of a resonant Raman process caused by the C60-Ag interaction. C1 GEOCENTR INC,FT WASHINGTON,MD 20744. RP ROSENBERG, A (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375, USA. NR 21 TC 18 Z9 18 U1 0 U2 5 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 JUN 10 PY 1994 VL 223 IS 1-2 BP 76 EP 81 DI 10.1016/0009-2614(94)00414-5 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NQ084 UT WOS:A1994NQ08400013 ER PT J AU KIRKENDALL, CK BUCHOLTZ, F AF KIRKENDALL, CK BUCHOLTZ, F TI SELFALIGNING DEMODULATOR FOR REMOTELY OPERATED FIBER OPTIC MAGNETIC SENSOR SYSTEM SO ELECTRONICS LETTERS LA English DT Article DE FIBER OPTIC SENSORS; MAGNETIC FIELD MEASUREMENT; MAGNETOSTRICTIVE DEVICES ID MAGNETOMETER AB A technique for automatic phase alignment and phase sensitive detection for a fibre optic magnetostrictive sensor is described. The technique which was successfully implemented in an undersea system for making long term measurements, is applicable to a variety of phase sensitive detection problems involving remote sensing. C1 UNIV GREENBELT,RES FDN,GREENBELT,MD. RP KIRKENDALL, CK (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5674,WASHINGTON,DC 20375, USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD JUN 9 PY 1994 VL 30 IS 12 BP 999 EP 1000 DI 10.1049/el:19940635 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA NV160 UT WOS:A1994NV16000053 ER PT J AU YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ GREIN, CH YOUNG, PM EHRENREICH, H MILES, RH CHOW, DH AF YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ GREIN, CH YOUNG, PM EHRENREICH, H MILES, RH CHOW, DH TI AUGER LIFETIME ENHANCEMENT IN INAS-GA1-XINXSB SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID MINORITY-CARRIER LIFETIME AB We have experimentally and theoretically investigated the Auger recombination lifetime in InAs-Ga1-xInxSb superlattices. Data were obtained by analyzing the steady-state photoconductive response to frequency-doubled CO2 radiation, at intensities varying by over four orders of magnitude. Theoretical Auger rates were derived, based on a k.p calculation of the superlattice band structure in a model which employs no adjustable parameters. At 77 K, both experiment and theory yield Auger lifetimes which are approximately two orders of magnitude longer than those in Hg1-xCdxTe with the same energy gap. This finding has highly favorable implications for the application of InAs-Ga1-xInxSb superlattices to infrared detector and nonlinear optical devices. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60607. HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138. HUGHES RES LABS,MALIBU,CA 90265. RP YOUNGDALE, ER (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. NR 15 TC 221 Z9 229 U1 1 U2 17 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 JUN 6 PY 1994 VL 64 IS 23 BP 3160 EP 3162 DI 10.1063/1.111325 PG 3 WC Physics, Applied SC Physics GA NP752 UT WOS:A1994NP75200033 ER PT J AU BLAUCH, DN ROLISON, DR AF BLAUCH, DN ROLISON, DR TI APPLICATION OF AC-IMPEDANCE FOR IN-SITU REAL-TIME MEASUREMENT OF CHANGES IN THE BULK CONDUCTIVITY OF AQUEOUS ZEOLITE DISPERSIONS DURING ELECTROLYSIS SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Note C1 USN,RES LAB,SURFACE CHEM BRANCH,CODE 6170,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375. NR 9 TC 5 Z9 5 U1 0 U2 0 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 JUN 6 PY 1994 VL 370 IS 1-2 BP 305 EP 308 DI 10.1016/0022-0728(93)03174-N PG 4 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA NR310 UT WOS:A1994NR31000041 ER PT J AU PICKETT, WE SINGH, DJ AF PICKETT, WE SINGH, DJ TI LUNI2B2C - A NOVEL NI-BASED STRONG-COUPLING SUPERCONDUCTOR SO PHYSICAL REVIEW LETTERS LA English DT Article ID TEMPERATURE AB The surprising recent discovery of superconductivity up to T(c)=23 K in Ni- and Pd-based rare-earth borocarbides raises the question of whether or not these materials constitute a new class of high temperature superconductors (HTS). For LuNi2B2C, with T(c)=16.6 K and a (known) layered crystal structure I4/mmm, electronic structure calculations indicate that it is a strongly 3D metal with all atoms contributing to the metallic character, completely unlike the cuprate HTS. Incorporating resistivity data we deduce a very strong electron-phonon coupling lambda(tr)=2.6, which we relate to an unusual combination of states at the Fermi level and substantial contributions from the vibrations of the light atoms. RP PICKETT, WE (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 19 TC 269 Z9 270 U1 1 U2 9 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 JUN 6 PY 1994 VL 72 IS 23 BP 3702 EP 3705 DI 10.1103/PhysRevLett.72.3702 PG 4 WC Physics, Multidisciplinary SC Physics GA NP958 UT WOS:A1994NP95800019 ER PT J AU CHOI, YS LEE, TN UHM, HS AF CHOI, YS LEE, TN UHM, HS TI HIGHLY INDUCED VOLTAGE IN A VACUUM SPARK DISCHARGE SO PHYSICS LETTERS A LA English DT Article ID X-RAY-EMISSION AB The magnetic field diffusion model is modified to calculate the induced high voltage in the vacuum spark discharge by assuming a current shell which contracts or expands radially with a finite velocity. For a contracting plasma column, the thus obtained hard X-ray (> 150 keV) spectrum is similar to that of experimental measurement. The theory is also supported by the experimental observation that the plasma region emitting the hard X-rays is less than 100 mum in dimension and that this is closely associated with the microplasma formation. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP CHOI, YS (reprint author), POHANG UNIV SCI & TECHNOL,DEPT PHYS,SAN 31 HYOJA DONG,POHANG 790784,SOUTH KOREA. NR 10 TC 0 Z9 0 U1 0 U2 0 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 JUN 6 PY 1994 VL 189 IS 1-2 BP 80 EP 85 DI 10.1016/0375-9601(94)90821-4 PG 6 WC Physics, Multidisciplinary SC Physics GA NQ067 UT WOS:A1994NQ06700015 ER PT J AU CHEN, XH GONSALVES, KE CHOW, GM XIAO, TD AF CHEN, XH GONSALVES, KE CHOW, GM XIAO, TD TI HOMOGENEOUS DISPERSION OF NANOSTRUCTURED ALUMINUM NITRIDE IN A POLYIMIDE MATRIX SO ADVANCED MATERIALS LA English DT Note ID SUSPENSIONS C1 UNIV CONNECTICUT,DEPT CHEM,STORRS,CT 06269. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. UNIV CONNECTICUT,CONNECTICUT ADV TECHNOL CTR PRECIS MFG,STORRS,CT 06269. RP CHEN, XH (reprint author), UNIV CONNECTICUT,INST MAT SCI,POLYMER SCI PROGRAM,STORRS,CT 06269, USA. NR 17 TC 23 Z9 29 U1 0 U2 6 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0935-9648 J9 ADV MATER JI Adv. Mater. PD JUN PY 1994 VL 6 IS 6 BP 481 EP 484 DI 10.1002/adma.19940060608 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA NR585 UT WOS:A1994NR58500007 ER PT J AU HASSAN, NF ELGHORAB, NM REHIM, MSA ELSHARKAWY, MS ELSAYED, NM EMARA, K SOLTANT, Y SANAD, M HIBBS, RG ARTHUR, RR AF HASSAN, NF ELGHORAB, NM REHIM, MSA ELSHARKAWY, MS ELSAYED, NM EMARA, K SOLTANT, Y SANAD, M HIBBS, RG ARTHUR, RR TI HIV-INFECTION IN RENAL DIALYSIS PATIENTS IN EGYPT SO AIDS LA English DT Letter C1 EGYPTIAN MINIST HLTH,CAIRO,EGYPT. ABBASSIA FEVER HOSP,CAIRO,EGYPT. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,BALTIMORE,MD. RP HASSAN, NF (reprint author), USN,MED RES UNIT 3,PSC 452 BOX 5000,CODE 301B,FPO,AE 09835, USA. NR 1 TC 22 Z9 23 U1 0 U2 0 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0269-9370 J9 AIDS JI Aids PD JUN PY 1994 VL 8 IS 6 BP 853 EP 853 DI 10.1097/00002030-199406000-00023 PG 1 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA NP436 UT WOS:A1994NP43600023 PM 8086148 ER PT J AU ROSS, ST AF ROSS, ST TI MILITARY HISTORY OF FRANCE, VOL 3, 1871-1940 - FRENCH - PEDRONCINI,G SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP ROSS, ST (reprint author), USN,COLL WAR,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER HISTORICAL REVIEW PI WASHINGTON PA 400 A ST SE, WASHINGTON, DC 20003 SN 0002-8762 J9 AM HIST REV JI Am. Hist. Rev. PD JUN PY 1994 VL 99 IS 3 BP 914 EP 914 DI 10.2307/2167843 PG 1 WC History SC History GA NT912 UT WOS:A1994NT91200077 ER PT J AU SIRISANTHANA, T PINYOPORNPANIT, V SIRISANTHANA, V STRICKMAN, D KELLY, DJ DASCH, GA AF SIRISANTHANA, T PINYOPORNPANIT, V SIRISANTHANA, V STRICKMAN, D KELLY, DJ DASCH, GA TI FIRST CASES OF SPOTTED-FEVER GROUP RICKETTSIOSIS IN THAILAND SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID SCRUB TYPHUS; TESTS AB The first three cases of spotted fever group rickettsiosis from Thailand are reported. The patients presented with fever, headache, lymphadenopathy, and petechial maculopapular rash. One patient also had an eschar and overt evidence of confusion. An indirect fluorescent antibody test, an indirect immunoperoxidase test, and an enzyme-linked immunosorbent assay demonstrated a broad, strong reactions of the sera of the patients with spotted fever group rickettsia antigens of many species, but not with antigens of typhus or scrub typhus rickettsiae. All three patients responded to treatment with a single dose of doxycycline. C1 ARMED FORCES RES INST MED SCI,BANGKOK 10400,THAILAND. USN,MED RES INST,DEPT INFECT DIS,VIRAL & RICKETTSIAL DIS PROGRAM,BETHESDA,MD 20889. RP SIRISANTHANA, T (reprint author), CHIANG MAI UNIV,FAC MED,CHIANG MAI 50002,THAILAND. NR 18 TC 34 Z9 35 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 JUN PY 1994 VL 50 IS 6 BP 682 EP 686 PG 5 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA NX126 UT WOS:A1994NX12600004 PM 8024059 ER PT J AU KNOOP, K TROTT, A SYVERUD, S AF KNOOP, K TROTT, A SYVERUD, S TI COMPARISON OF DIGITAL VERSUS METACARPAL BLOCKS FOR REPAIR OF FINGER INJURIES SO ANNALS OF EMERGENCY MEDICINE LA English DT Article AB Study objective: This study compared efficacy, degree of discomfort, and time to anesthesia of digital blocks and metacarpal blocks for digital anesthesia. Design: Randomized, prospective, nonblinded, clinical study conducted from April 1992 to January 1993. Patients served as their own controls. Setting: Inner-city and community hospital emergency departments. Type of participants: Convenience sample of 30 adult patients, with third or fourth finger injuries including and distal to the proximal interphalangeal joint that required digital anesthesia. Interventions: Digital blocks and a metacarpal blocks were performed (one per side) on all 30 patients (total of 60 blocks). The order of the blocks was randomized. Measurements: A digital block and a metacarpal block were performed on each patient. Patients immediately rated the pain associated with each technique on a nonsegmented visual analog scale. Efficacy was assessed by requirement for additional anesthesia and anesthesia to pinprick. Time to anesthesia was assessed after each block in 23 patients. Results: Mean visual analog scale pain scores were 2.53 for digital block and 3.38 for metacarpal block (P= .1751, Student's t-test). Metacarpal block failed anesthesia to pinprick in 23% of patients compared to 3% for digital block (P=.0227, X2). Time to anesthesia was significantly shorter for digital block compared to metacarpal block, with a mean of 2.82 minutes versus 6.35 minutes (P< .0001, Student's t-test). Conclusion: Digital block and metacarpal block, as described in this study, are equally painful procedures. Digital block, however, is more efficacious and requires significantly less time to anesthesia for the injured finger. RP KNOOP, K (reprint author), USN,MED CTR,DEPT EMERGENCY MED,PORTSMOUTH,VA 23708, USA. NR 0 TC 13 Z9 13 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0196-0644 J9 ANN EMERG MED JI Ann. Emerg. Med. PD JUN PY 1994 VL 23 IS 6 BP 1296 EP 1300 DI 10.1016/S0196-0644(94)70355-8 PG 5 WC Emergency Medicine SC Emergency Medicine GA NN772 UT WOS:A1994NN77200010 PM 8198304 ER PT J AU MATTSSON, L INGERS, J BENNETT, JM AF MATTSSON, L INGERS, J BENNETT, JM TI WAVELENGTH DEPENDENCE OF ANGLE-RESOLVED SCATTERING IN THE EXTREME-ULTRAVIOLET-VISIBLE REGION SO APPLIED OPTICS LA English DT Article DE ANGLE-RESOLVED SCATTERING; SURFACE ROUGHNESS; WAVELENGTH SCALING; ALUMINUM ID LIGHT-SCATTERING; ALUMINUM FILMS; SURFACE; INSTRUMENT AB The wavelength dependence of p-polarized, angle-resolved scattering has been thoroughly investigated on 12 aluminum films at wavelengths of 160, 325, and 633 nm. The isotropic samples were made by evaporating aluminum films in ultrahigh vacuum onto supersmooth silicon wafers at different temperatures. By further annealing in ultrahigh vacuum, surface roughnesses of approximately 5-70 angstrom rms were obtained, as measured by total integrated scattering. The experimental measurements were carried out in a dedicated angle-resolved scattering system with provisions for operation in vacuum and for illumination of the same spot on the sample at all three wavelengths. The theoretically expected 1/lambda\4 dependence was in reasonable agreement with measured values for the average of all 12 samples, but large variations were found for the individual samples. In particular the wavelength dependence was far from a constant ratio when plotted versus the surface spatial frequency. Hillocks on some of the aluminum films produced additional scattering. It was not possible to explain this additional scattering with the Twersky model of conducting hemispheres on an infinitely conducting plane. C1 ROYAL INST TECHNOL, INST OPT RES, SURFACE EVALUAT LAB, S-10044 STOCKHOLM 70, SWEDEN. ROYAL INST TECHNOL, DEPT PHYS 2, S-10044 STOCKHOLM 70, SWEDEN. RP MATTSSON, L (reprint author), USN, CTR AIR WARFARE, RES DEPT, MICHELSON LAB, DIV WEAP, CHINA LAKE, CA 93555 USA. NR 28 TC 6 Z9 6 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUN 1 PY 1994 VL 33 IS 16 BP 3523 EP 3532 PG 10 WC Optics SC Optics GA NR475 UT WOS:A1994NR47500034 PM 20885738 ER PT J AU STRICKLAND, DJ COX, RJ BARNES, RP PAXTON, LJ MEIER, RR THONNARD, SE AF STRICKLAND, DJ COX, RJ BARNES, RP PAXTON, LJ MEIER, RR THONNARD, SE TI MODEL FOR GENERATING GLOBAL IMAGES OF EMISSION FROM THE THERMOSPHERE SO APPLIED OPTICS LA English DT Article DE EUV FUV DAYGLOW; THERMOSPHERIC REMOTE SENSING; GLOBAL IMAGING ID DAYGLOW; ATMOSPHERE; DYNAMICS AB A general model is presented for the production of images of thermospheric dayglow emissions. Ultraviolet images are generated that are relevant to remote sensing of the principal constituents of the thermosphere (O and N2) and the ionosphere (O+). The emission features considered here are 1356-angstrom (O), Lyman-Birge-Hopfield bands of N2 between 1650 and 1715 angstrom, and 834 angstrom (O+). The MSIS-86 and International Reference Ionosphere models were used as climatological representations of the distributions of neutrals and ions, respectively. We describe the generation of the images beginning with the production of volume-emission-rate profiles. A detailed description of the generalized image-generation technique is given. This technique permits us to change the observer's altitude and viewing geometry without incurring a large computational burden. The images produced by this technique demonstrate the potential of airglow imaging systems for remote sensing of global variability in thermospheric composition. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP STRICKLAND, DJ (reprint author), COMPUTAT PHYS INC, SUITE 600, 2750 PROSPER DR, FAIRFAX, VA 22031 USA. RI Meier, Robert/G-4749-2014; Paxton, Larry/D-1934-2015 OI Meier, Robert/0000-0001-8497-7115; Paxton, Larry/0000-0002-2597-347X NR 22 TC 8 Z9 8 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUN 1 PY 1994 VL 33 IS 16 BP 3578 EP 3594 PG 17 WC Optics SC Optics GA NR475 UT WOS:A1994NR47500043 PM 20885747 ER PT J AU OLLAYOS, CW RIORDAN, GP RUSHIN, JM AF OLLAYOS, CW RIORDAN, GP RUSHIN, JM TI ESTROGEN-RECEPTOR DETECTION IN PARAFFIN SECTIONS OF ADENOCARCINOMA OF THE COLON, PANCREAS, AND LUNG SO ARCHIVES OF PATHOLOGY & LABORATORY MEDICINE LA English DT Article ID EPIDERMAL GROWTH-FACTOR; HUMAN COLORECTAL-CANCER; SEX STEROID-RECEPTORS; PROGESTERONE RECEPTORS; MONOCLONAL-ANTIBODIES; GASTRIC-CANCER; IMMUNOHISTOCHEMICAL ANALYSIS; HORMONE RECEPTORS; UNKNOWN PRIMARY; TUMORS AB We performed a retrospective analysis for the presence of estrogen receptors (ERs) in known cases of adenocarcinoma of the colon, pancreas, and lung. Estrogen receptor status was determined by immunohistochemical methods using the ERICA (Abbott Laboratories, North Chicago, III) antibody on paraffin sections. None of 43 colon and 18 pancreatic adenocarcinomas demonstrated ERs by this method. Three of 42 lung adenocarcinomas exhibited some degree of nuclear staining for ERs. When evaluating an adenocarcinoma of unknown primary site, the ER-ICA antibody can be useful when included in a panel of antibodies. Positive results tend to exclude colonic or pancreatic, but not pulmonary, primary sites. RP OLLAYOS, CW (reprint author), USN,MED CTR,DEPT LAB MED,DIV ANAT PATHOL,BETHESDA,MD 20814, USA. NR 34 TC 57 Z9 59 U1 0 U2 0 PU COLLEGE AMER PATHOLOGISTS PI NORTHFIELD PA C/O KIMBERLY GACKI, 325 WAUKEGAN RD, NORTHFIELD, IL 60093-2750 SN 0003-9985 J9 ARCH PATHOL LAB MED JI Arch. Pathol. Lab. Med. PD JUN PY 1994 VL 118 IS 6 BP 630 EP 632 PG 3 WC Medical Laboratory Technology; Medicine, Research & Experimental; Pathology SC Medical Laboratory Technology; Research & Experimental Medicine; Pathology GA NQ005 UT WOS:A1994NQ00500019 PM 8204009 ER PT J AU MACKEY, SL SMITH, KJ YEAGER, JK AF MACKEY, SL SMITH, KJ YEAGER, JK TI RADIOLOGICAL CASES OF THE MONTH - PICTURE OF THE MONTH - LYMPHANGIOMA CIRCUMSCRIPTUM SO ARCHIVES OF PEDIATRICS & ADOLESCENT MEDICINE LA English DT Note ID LASER C1 WALTER REED ARMY INST RES,WASHINGTON,DC. RP MACKEY, SL (reprint author), USN,NATL MED CTR,DEPT DERMATOL,BETHESDA,MD, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 1072-4710 J9 ARCH PEDIAT ADOL MED JI Arch. Pediatr. Adolesc. Med. PD JUN PY 1994 VL 148 IS 6 BP 609 EP 610 PG 2 WC Pediatrics SC Pediatrics GA NQ154 UT WOS:A1994NQ15400011 PM 8193686 ER PT J AU SEATON, J AF SEATON, J TI A POLITICAL-WARRIOR MODEL - THE COMBINED ACTION PROGRAM SO ARMED FORCES & SOCIETY LA English DT Article AB This article examines the Vietnam-era Marine Corps Combined Action Program from a context in which political activities at the junior Marine level arose from tactical considerations. It points out how at the junior soldier level, war and politics are often indistinct, or traditional relationships between the two are reversed. What emerges is a fusion of political and military considerations. It is significant that this political-military fusion occurs at not only the senior officer levels as is commonly outlined in civil-military relations theory, but also at the junior enlisted (E-1 through E-5) level. In using the Combined Action Program as an analytical framework, this article identifies a growing political function; one relevant RP SEATON, J (reprint author), USN ACAD,DEPT POLIT SCI,ANNAPOLIS,MD 21402, USA. NR 24 TC 1 Z9 1 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 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD SUM PY 1994 VL 20 IS 4 BP 549 EP 563 DI 10.1177/0095327X9402000404 PG 15 WC Political Science; Sociology SC Government & Law; Sociology GA PC757 UT WOS:A1994PC75700003 ER PT J AU MONET, AKB STONE, RC MONET, DG DAHN, CC HARRIS, HC LEGGETT, SK PIER, JR VRBA, FJ WALKER, RL AF MONET, AKB STONE, RC MONET, DG DAHN, CC HARRIS, HC LEGGETT, SK PIER, JR VRBA, FJ WALKER, RL TI ASTROMETRY FOR THE GALILEO MISSION .1. ASTEROID ENCOUNTERS SO ASTRONOMICAL JOURNAL LA English DT Article ID OPTICAL REFERENCE FRAME; RADIO-SOURCE POSITIONS; ADDITIONAL RADIO; NORTHERN-HEMISPHERE; FK5 AB Optical CCD astrometry was done at the U.S. Naval Observatory FIagstaff Station to obtain positions of solar system bodies to be encountered by the Galileo spacecraft. The objects observed were the minor planets 951 Gaspra and 243 Ida, discussed in this paper, and the Galilean satellites of Jupiter, to be discussed in Paper II. Observations of Gaspra were made from April through August 1991, and Ida was observed from 1991 November through 1993 May. Each observing campaign was followed by a successful encounter. The instrumentation, techniques, analysis methods, and astrometric results are described. RP MONET, AKB (reprint author), USN OBSERV,FLAGSTAFF STN,FLAGSTAFF,AZ 86002, USA. OI Leggett, Sandy/0000-0002-3681-2989 NR 33 TC 7 Z9 7 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUN PY 1994 VL 107 IS 6 BP 2290 EP 2294 DI 10.1086/117036 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NN596 UT WOS:A1994NN59600033 ER PT J AU QUIRRENBACH, A MOZURKEWICH, D BUSCHER, DF HUMMEL, CA ARMSTRONG, JT AF QUIRRENBACH, A MOZURKEWICH, D BUSCHER, DF HUMMEL, CA ARMSTRONG, JT TI PHASE-REFERENCED VISIBILITY AVERAGING IN OPTICAL LONG-BASE-LINE INTERFEROMETRY SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE ATMOSPHERIC EFFECTS; INSTRUMENTATION, INTERFEROMETERS; METHODS, OBSERVATIONAL; METHODS, DATA ANALYSIS; TECHNIQUES, INTERFEROMETRIC ID III STELLAR INTERFEROMETER; ASTROMETRY AB In the photon-starved regime, the signal-to-noise ratio of interferometric data depends on the coherent integration time. To extend the integration time beyond the limit imposed by atmospheric fluctuations, the phases taken in a narrow ''signal'' channel can be corrected by referencing them to those taken in a wider ''tracking'' channel. A number of instrumental and atmospheric effects decorrelate the phases in the two channels and thus constrain the range of conditions under which the phase-referencing technique can be used. In the case of the MkIII stellar interferometer, differential refraction at intermediate to large zenith angles is the most important limitation. Tests with MkIII data in the photon-rich regime demonstrate that the phase-referencing technique works well at moderate zenith angles. In the photon-starved regime, the expected improvement of the signal-to-noise ratio is readily observed. We use phase-referenced data taken on the bright star a Boo close to the first null of the visibility function to show that the MkIII data are free from additive bias at the V2 less-than-or-equal-to 10(-4) level. The absence of any bias larger than this value is an important requirement for future imaging interferometers. C1 USN OBSERV, NRL USNO OPT INTERFEROMETER PROJECT, WASHINGTON, DC 20392 USA. UNIV SPACE RES ASSOC, WASHINGTON, DC 20024 USA. USN, RES LAB, DIV REMOTE SENSING, WASHINGTON, DC 20375 USA. NR 14 TC 29 Z9 29 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 JUN PY 1994 VL 286 IS 3 BP 1019 EP 1027 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NT510 UT WOS:A1994NT51000043 ER PT J AU KASSIM, NE HERTZ, P VANDYK, SD WEILER, KW AF KASSIM, NE HERTZ, P VANDYK, SD WEILER, KW TI X-RAY OBSERVATIONS OF SUPERNOVA-REMNANTS AS DISTANCE INDICATORS SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUPERNOVA REMNANTS; X-RAYS, GENERAL ID DISCOVERY; ROSAT AB We investigate whether ROSAT observations of thermal X-ray emission from shell-type supernova remnants (SNRs) can be used to constrain their distances. The most critical assumption is that the initial kinetic energy (epsilon0) of a supernova (SN) explosion is a constant at epsilon0 = 10(51) ergs; however, the derived distance (D) is only weakly dependent on epsilon0 (D is-proportional-to epsilon0(0.4)). We evaluate this technique by applying it to SNRs with independently determined distances, and our initial results indicate good agreement. We conclude that the ROSAT all-sky survey may be used to establish, for the first time, a set of good distance estimates to a large number of extended, shell-type SNRs. The energy range of ROSAT is well suited for this purpose, since most shell-type SNRs have thermal X-ray spectra which peak within the ROSAT PSPC energy range of 0.1-2.4 keV. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7621,WASHINGTON,DC 20375. RP KASSIM, NE (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7215,WASHINGTON,DC 20375, USA. OI Van Dyk, Schuyler/0000-0001-9038-9950 NR 28 TC 7 Z9 7 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 JUN 1 PY 1994 VL 427 IS 2 BP L95 EP L97 DI 10.1086/187373 PN 2 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NN740 UT WOS:A1994NN74000008 ER PT J AU DONOHUE, KA WIMBUSH, M ZHU, XL CHISWELL, SM LUKAS, R MILLER, L HURLBURT, HE AF DONOHUE, KA WIMBUSH, M ZHU, XL CHISWELL, SM LUKAS, R MILLER, L HURLBURT, HE TI 5 YEARS CENTRAL PACIFIC SEA-LEVEL FROM IN-SITU ARRAY, SATELLITE ALTIMETER AND NUMERICAL-MODEL SO ATMOSPHERE-OCEAN LA English DT Note ID EASTERN EQUATORIAL PACIFIC; EL-NINO; OCEAN; GEOSAT; VARIABILITY; WAVES; OSCILLATIONS; ANOMALIES; CURRENTS; HEIGHT AB Temporal and spatial features of central equatorial Pacific Ocean sea-level variation appear similar, in measurements from two very different systems (one in the ocean and one carried on a satellite), and in results from a numerical model of the region. In particular, there is an interannual cycle: during El Nino, Kelvin waves appear at the equator, and the sea-surface ridge associated with the equatorial current system shifts southward; in non-El Nino years, instability waves appear at 6-degrees-N (strongest around the end of each calendar year), and the ridge shifts to the north. This three-way comparison gives support to both measurement systems and to the numerical model. C1 UNIV HAWAII,JOINT INST MARINE & ATMOSPHER RES,HONOLULU,HI 96822. NOAA,NOS,GEOSCI LAB,N OES11,SILVER SPRING,MD 20910. USN,RES LAB,BAY ST LOUIS,MS 39529. RP DONOHUE, KA (reprint author), UNIV RHODE ISL,GRAD SCH OCEANOG,NARRAGANSETT,RI 02882, USA. RI Lukas, Roger/B-3715-2009; Miller, Laury/B-8305-2011 OI Miller, Laury/0000-0003-3095-5804 NR 32 TC 5 Z9 5 U1 0 U2 0 PU CANADIAN METEOROLOGICAL OCEANOGRAPHIC SOC PI OTTAWA PA 150 LOUIS PASTEUR PVT., STE 112, MCDONALD BUILDING, OTTAWA ON K1N 6N5, CANADA SN 0705-5900 J9 ATMOS OCEAN JI Atmos.-Ocean PD JUN PY 1994 VL 32 IS 2 BP 495 EP 506 PG 12 WC Meteorology & Atmospheric Sciences; Oceanography SC Meteorology & Atmospheric Sciences; Oceanography GA PA686 UT WOS:A1994PA68600012 ER PT J AU SIVASHANKAR, N KAMINER, I KHARGONEKAR, PP AF SIVASHANKAR, N KAMINER, I KHARGONEKAR, PP TI OPTIMAL CONTROLLER SYNTHESIS WITH D-STABILITY SO AUTOMATICA LA English DT Note DE CONTROL SYSTEM SYNTHESIS; LINEAR OPTIMAL CONTROL; ALGEBRAIC RICCATI EQUATIONS ID H-INFINITY CONTROL; SPECIFIED REGION; CONVEX-OPTIMIZATION; POLE ASSIGNMENT; PLACEMENT; REGULATOR; DESIGN; DISK AB In this paper, we consider the problem of finding controllers which place the eigenvalues of the closed-loop system matrix in a prespecified circular region in the left-half plane and minimize an associated quadratic cost function. We give solutions to both state-feedback and output-feedback synthesis problems. C1 UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,ANN ARBOR,MI 48109. USN,POST GRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943. OI Khargonekar, Pramod/0000-0001-6634-6950 NR 16 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0005-1098 J9 AUTOMATICA JI Automatica PD JUN PY 1994 VL 30 IS 6 BP 1003 EP 1008 DI 10.1016/0005-1098(94)90193-7 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA NQ746 UT WOS:A1994NQ74600006 ER PT J AU SHENDER, BS DUBIN, SE AF SHENDER, BS DUBIN, SE TI CONTRIBUTION OF CEREBROSPINAL-FLUID TO RHEOENCEPHALOGRAPHIC WAVE-FORMS DURING HYPOXIC AND +GZ STRESS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB Acceleration (G) forces generated by high performance aircraft induce a redistribution of blood and cerebrospinal fluid (CSF) in the head resulting in decreased visual function, and may lead to G-induced loss of consciousness (G-LOC). CSF provides a critical support function to the brain by equalizing the pressure changes occurring throughout the skull under G-stress, particularly to the venous system. While it has been acknowledged that understanding this role of the CSF system is essential in order to enhance G-tolerance, no such studies have been conducted since the 1940's, due to technical difficulties. We have shown that these can be surmounted through the development of rheoencephalography (REG), or impedance plethysmography of the head, to noninvasively monitor shifts in CSF under both hypoxic (oxygen deprivation in the laboratory) and actual +Gz stress (small centrifuge) conditions. Using surgical and physiologic techniques on New Zealand White rabbits, we have established the following: 1) REG contains information concerning the function of the vascular, CSF, and respiratory systems as they influence both beat-to-beat and bulk movement of cephalic fluids; 2) respiratory effects on cerebral blood volume and CSF pressure can be monitored with the REG; 3) REG waveforms obtained from rabbits under laboratory and +Gz stress conditions were similar to those obtained during human +Gz centrifuge exposures; 4) using (i) brief occlusions of blood flow into the head and (ii) withdrawals of CSF, it was estimated that the relative volumetric contributions of blood and CSF to the REG were 70% and 30%, respectively; and 5) physiologic responses to stress are reflected in changes in the frequency content of the REG. We conclude that REG provides real-time noninvasive information concerning the state of cephalic blood and CSF systems, including the influence of thoracic pressures, under operationally relevant stress conditions. C1 DREXEL UNIV,INST BIOMED ENGN & SCI,PHILADELPHIA,PA 19104. RP SHENDER, BS (reprint author), USN,CTR WARFARE,DIV AIRCRAFT,POB 5152,CODE 6023,WARMINSTER,PA 18974, USA. NR 17 TC 3 Z9 3 U1 0 U2 0 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 JUN PY 1994 VL 65 IS 6 BP 510 EP 517 PG 8 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA NN771 UT WOS:A1994NN77100002 PM 8074623 ER PT J AU KARLE, IL FLIPPENANDERSON, JL AGARWALLA, S BALARAM, P AF KARLE, IL FLIPPENANDERSON, JL AGARWALLA, S BALARAM, P TI CONFORMATION OF THE FLEXIBLE BENT HELIX OF LEU(1)-ZERVAMICIN IN CRYSTAL-C AND A POSSIBLE GATING ACTION FOR ION PASSAGE SO BIOPOLYMERS LA English DT Article ID ALPHA-HELICES; CHANNEL; ALAMETHICIN; PEPTIDE; MODEL; POLYPEPTIDES; ZERVAMICINS; AGGREGATION; POLYMORPHS; PARALLEL AB The membrane channel-forming polypeptide, Leu(1)-zervamicin, Ac-Leu-Ile-Gln-Iva-Ile(5)-Thr-Aib-Leu-Aib-Hyp(10) -Gln-Aib-Hyp-Aib-Pro(15)-Phol (Aib: alpha-aminoisobutyric acid; Iva: isovaline; Hyp: 4-hydroxyproline; Phol: phenylalininol) has been analyzed by x-ray diffraction in a third crystal form. Although the bent helix is quite similar to the conformations found in crystals A and B, the amount of bending is more severe with a bending angle approximate to 47 degrees, The water channel formed by the convex polar faces of neighboring helices is larger at the mouth than in crystals A and B, and the water sites have become disordered. The channel is interrupted in the middle by a hydrogen bond between the OH of Hyp(10) and the NH2 of the Gln(11) of a neighboring molecule. The side chain of Gln(11) is wrapped around the helix backbone in an unusual fashion in order that it can augment the polar side of the helix. In the present crystal C there appears to be an additional conformation for the Gln(11) side chain (with approximate to 20% occupancy) that opens the channel for possible ion passage. Structure parameters for C85H140N18O22.xH(2)O.C2H5OH are space group P2(1)2(1)2(1), a = 10.337 (2) Angstrom, b = 28.387 (7) Angstrom, c = 39.864 (11) Angstrom, Z = 4, agreement factor R = 12.99% for 3250 data observed > 3 sigma(F), resolution = 1.2 Angstrom. (C) 1994 John Wiley & Sons, Inc. C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM30902] NR 24 TC 46 Z9 46 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 JUN PY 1994 VL 34 IS 6 BP 721 EP 735 DI 10.1002/bip.360340605 PG 15 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NM162 UT WOS:A1994NM16200004 PM 8025219 ER PT J AU Heagy, JF Carroll, TL AF Heagy, J. F. Carroll, T. L. TI Chaotic synchronization in Hamiltonian systems SO CHAOS LA English DT Article AB It is shown that Hamiltonian systems can exhibit the phenomenon of chaotic synchronization. Specific attention is paid to the standard map. Analytic synchronization conditions are derived and numerically verified for the standard map. We report on experimental studies of an analog electronic circuit realization of a ''piecewise linear standard map.'' When coupled appropriately to a duplicate circuit, chaotic synchronization is observed. The relevance of this study to synchronization in other Hamiltonian systems is discussed. C1 [Heagy, J. F.; Carroll, T. L.] USN, Res Lab, Washington, DC 20375 USA. RP Heagy, JF (reprint author), USN, Res Lab, Washington, DC 20375 USA. OI Carroll, Thomas/0000-0002-2371-2049 FU National Research Council FX We thank L. M. Pecora and P. T. Boyd for useful discussions and continued encouragement. JFH is supported by a National Research Council postdoctoral fellowship. NR 13 TC 13 Z9 13 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 1054-1500 EI 1089-7682 J9 CHAOS JI Chaos PD JUN PY 1994 VL 4 IS 2 BP 385 EP 390 DI 10.1063/1.166016 PG 6 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA V22XW UT WOS:000208308900021 ER PT J AU GROSHENS, TJ GEDRIDGE, RW LOWEMA, CK AF GROSHENS, TJ GEDRIDGE, RW LOWEMA, CK TI ROOM-TEMPERATURE MOCVD OF SB2TE3 FILMS AND SOLUTION PRECIPITATION OF M2TE3 (M=SB, BI) POWDERS VIA A NOVEL (N,N-DIMETHYLAMINO)TRIMETHYLSILANE ELIMINATION-REACTION SO CHEMISTRY OF MATERIALS LA English DT Note ID THIN-FILMS; SULFIDE RP GEDRIDGE, RW (reprint author), USN,CHINA LAKE,CA 93555, USA. NR 18 TC 37 Z9 37 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD JUN PY 1994 VL 6 IS 6 BP 727 EP 729 DI 10.1021/cm00042a005 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NT063 UT WOS:A1994NT06300005 ER PT J AU LEVAI, M KAPLAN, S DALY, K MCINTOSH, G AF LEVAI, M KAPLAN, S DALY, K MCINTOSH, G TI THE EFFECT OF THE PERSIAN-GULF CRISIS ON THE PSYCHIATRIC-HOSPITALIZATION OF NAVY CHILDREN AND ADOLESCENTS SO CHILD PSYCHIATRY & HUMAN DEVELOPMENT LA English DT Article DE SEPARATION; LOSS OF FATHER; DEPLOYMENT; GULF-WAR; FAMILY RESPONSE TO EXTERNAL CRISIS AB The effect of the Persian Gulf Crisis on Navy families was studied through admission rates of children to a private psychiatric hospital, marital status and diagnostic categories. During that time there was a statistical increase in admission of young boys under age twelve and all children from remarried families. Almost one-half of these patients were diagnosed with Dysthymia whereas this diagnosis was given only once during the time period before or after the crisis. C1 CHARTER HOSP,JACKSONVILLE,FL. NAVAL HOSP,JACKSONVILLE,FL. NR 7 TC 2 Z9 2 U1 0 U2 0 PU HUMAN SCI PRESS INC PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013-1578 SN 0009-398X J9 CHILD PSYCHIAT HUM D JI Child Psychiat. Hum. Dev. PD SUM PY 1994 VL 24 IS 4 BP 245 EP 254 DI 10.1007/BF02353200 PG 10 WC Psychology, Developmental; Pediatrics; Psychiatry SC Psychology; Pediatrics; Psychiatry GA NT517 UT WOS:A1994NT51700003 PM 8082420 ER PT J AU LEWIS, T AF LEWIS, T TI MULTIMEDIA OR MULTI-HYPE SO COMPUTER LA English DT Editorial Material RP LEWIS, T (reprint author), USN,SCH POSTGRAD,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 JUN PY 1994 VL 27 IS 6 BP 6 EP 7 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA NQ214 UT WOS:A1994NQ21400002 ER PT J AU PETERSON, GW RYANJONES, RE SAMPSON, JP REARDON, RC SHAHNASARIAN, M AF PETERSON, GW RYANJONES, RE SAMPSON, JP REARDON, RC SHAHNASARIAN, M TI A COMPARISON OF THE EFFECTIVENESS OF 3 COMPUTER-ASSISTED CAREER GUIDANCE SYSTEMS - DISCOVER, SIGI, AND SIGI-PLUS SO COMPUTERS IN HUMAN BEHAVIOR LA English DT Article ID DECISION-MAKING; INDECISION; EXPLORATION; STUDENTS; WOMEN AB One hundred and twenty-six volunteer students from an introductory psychology course at a large public southeastern university were randomly assigned to one of three computer-assisted career guidance (CACG) systems - SIGI, SIGI PLUS, and DISCOVER. The respective systems were compared in terms of an instrument developed to measure three constructs in CACG effectiveness: analysis, synthesis, and computer effect. Both the Occupational Alternative Question (Zener & Schnuelle, 1972; modified by Slaney, 1980) and the My Vocational Situation (Holland, Daiger, & Power, 1980a) inventories were included to assess the possible moderating effect of individual differences in the perception of CACG effectiveness. The results revealed that the majority of participants in each condition rated the CACG system to which they were assigned positively on all three constructs. While we concluded there were no practical differences in effectiveness among the three systems, students with a need for career information rated the lists of career options generated by SIGI and DISCOVER more favorably than those with no such need. Implications for further research on the use of CACG systems are discussed. C1 USN HOSP,SAN DIEGO,CA 92134. RP PETERSON, GW (reprint author), FLORIDA STATE UNIV,TALLAHASSEE,FL 32306, USA. NR 44 TC 6 Z9 6 U1 2 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0747-5632 J9 COMPUT HUM BEHAV JI Comput. Hum. Behav. PD SUM PY 1994 VL 10 IS 2 BP 189 EP 198 DI 10.1016/0747-5632(94)90002-7 PG 10 WC Psychology, Multidisciplinary; Psychology, Experimental SC Psychology GA NB865 UT WOS:A1994NB86500002 ER PT J AU FLIPPEN, LD AF FLIPPEN, LD TI CURRENT DYNAMIC SUBSTRUCTURING METHODS AS APPROXIMATIONS TO CONDENSATION MODEL-REDUCTION SO COMPUTERS & MATHEMATICS WITH APPLICATIONS LA English DT Article DE CONDENSATION; DYNAMIC SUBSTRUCTURING; GUYAN; COMPONENT; MODAL; MODE SYNTHESIS; DEGREE-OF-FREEDOM ID LARGE SPACE STRUCTURES AB Condensation Model Reduction (CMR) theory, when viewed as a dynamic substructuring method, is shown to encompass much of the existing dynamic substructuring methods as special cases of a single unified approach. Dynamic substructuring refers to the partitioning of a semi-discrete (continuous-in-time) mathematical model with respect to its dependence on the discretized independent variables (usually spatial) with the typical intention of eliminating most of the degrees-of-freedom in each partition (substructure) of a subset of isolated partitions. As an example, a contiguous subset of finite elements could be viewed as a substructure (superelement). One important use of dynamic substructuring is, hence, to analyze complex dynamic systems that are too large for current computers by reducing their size. The three currently used methods of dynamic substructuring are referred to as Guyan, Improved Reduced System (IRS), and Component Mode Synthesis (CMS) reduction, the latter having several variants. (The related Modal Reduction method was not considered here since, in that method, the work associated with reducing a particular substructure is not limited to that substructure.) In contrast to the current methods, the accuracy of CMR can be systematically improved by the inclusion of nonmodal higher order terms (as well as by the inclusion of additional modes). It is shown that the transformation matrices associated with both IRS and the Craig-Bampton (fixed interface) version of CMS approximate corresponding special cases of CMR. (The reduced-degree-of-freedom mass, damping, and stiffness matrices are different from those of CMR because CMR does not reduce the matrices via a matrix transformation.) In addition, the appearance of modes in CMR occurs as a natural consequence of the theory and not, as in CMS, as a heuristic inclusion to the transformation matrix. Classic Guyan reduction, in its entirety, is also shown to approximate a special case of CMR. RP FLIPPEN, LD (reprint author), USN,RES LAB,CODE 6380,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 13 TC 3 Z9 3 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0898-1221 J9 COMPUT MATH APPL JI Comput. Math. Appl. PD JUN PY 1994 VL 27 IS 12 BP 17 EP 29 DI 10.1016/0898-1221(94)90082-5 PG 13 WC Mathematics, Applied SC Mathematics GA NU286 UT WOS:A1994NU28600003 ER PT J AU LEWIS, DW FONTANA, C MEHALLICK, LK EVERETT, Y AF LEWIS, DW FONTANA, C MEHALLICK, LK EVERETT, Y TI TRANSDERMAL SCOPOLAMINE FOR REDUCTION OF DROOLING IN DEVELOPMENTALLY DELAYED CHILDREN SO DEVELOPMENTAL MEDICINE AND CHILD NEUROLOGY LA English DT Article AB Ten developmentally delayed children with excessive drooling were randomized in a double-blind, placebo-controlled study to assess the efficacy and safety of transdermal scopolamine. Over half of the patients had a statistically significant reduction in drooling, and one-third had cessation of drooling, while wearing the scopolamine patch. This short-term study supports earlier reports of the safety and efficacy of transdermal scopolamine for reducing excessive drooling in developmentally disabled children. C1 USN HOSP,DEPT PEDIAT & NEUROL,PORTSMOUTH,VA. CHILDRENS HOSP KINGS DAUGHTER,NORFOLK,VA 23507. NR 5 TC 50 Z9 50 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0012-1622 J9 DEV MED CHILD NEUROL JI Dev. Med. Child Neurol. PD JUN PY 1994 VL 36 IS 6 BP 484 EP 486 PG 3 WC Clinical Neurology; Pediatrics SC Neurosciences & Neurology; Pediatrics GA NM358 UT WOS:A1994NM35800003 PM 7516297 ER PT J AU WU, C SCHULDEN, W AF WU, C SCHULDEN, W TI SPECIFIC HEATING LOAD OF THERMOELECTRIC HEAT-PUMPS SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE THERMOELECTRICS; HEAT PUMP; FINITE-TIME THERMODYNAMICS AB A mathematical model for calculating the performance of a thermoelectric heat pump to achieve a specific heating load is presented. The effects of Joulean heating and thermal conduction are considered. An elaborate heat transfer model is employed to relate the thermal resistances between the thermoelectric system and its surroundings. A specific heating load, heating load per unit of total heat exchanger surface area, is adopted as the objective function for the thermoelectric heat pump performance analysis in this paper. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 24 Z9 27 U1 0 U2 1 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 JUN PY 1994 VL 35 IS 6 BP 459 EP 464 DI 10.1016/0196-8904(94)90085-X PG 6 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA NR522 UT WOS:A1994NR52200001 ER PT J AU FOO, SY TAKEFUJI, Y SZU, H AF FOO, SY TAKEFUJI, Y SZU, H TI JOB-SHOP SCHEDULING BASED ON MODIFIED TANK-HOPFIELD LINEAR-PROGRAMMING NETWORKS SO ENGINEERING APPLICATIONS OF ARTIFICIAL INTELLIGENCE LA English DT Article DE JOB-SHOP SCHEDULING; HOPFIELD NEURAL NETWORKS; MIXED INTEGER-LINEAR PROGRAMMING AB The Tank-Hopfield linear programming network is modified to solve job-shop scheduling, a classical optimization problem. Using a linear energy function, the approach described in this paper avoids the traditional problems associated with most Hopfield networks using quadratic energy functions. Although this approach requires more hardware (in terms of processing elements and resistive interconnects) than a recent approach by Zhou et al. (IEEE Trans. Neural Networks 2, 175-179, 1991) the neurons in the modified Tank-Hopfield network do not perform extensive calculations, unlike those described by Zhou et al. C1 FSU,FAMU,COLL ENGN,DEPT ELECT ENGN,TALLAHASSEE,FL 32316. CASE WESTERN RESERVE UNIV,CLEVELAND,OH 44106. USN,CTR SURFACE WARFARE,WASHINGTON,DC 20350. NR 5 TC 15 Z9 16 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0952-1976 J9 ENG APPL ARTIF INTEL JI Eng. Appl. Artif. Intell. PD JUN PY 1994 VL 7 IS 3 BP 321 EP 327 DI 10.1016/0952-1976(94)90059-0 PG 7 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Automation & Control Systems; Computer Science; Engineering GA PC001 UT WOS:A1994PC00100009 ER PT J AU MILLER, B KLEIN, TA OPSAHL, MS AF MILLER, B KLEIN, TA OPSAHL, MS TI THE EFFECT OF A SURGICAL LUBRICANT ON IN-VIVO SPERM PENETRATION OF CERVICAL-MUCUS SO FERTILITY AND STERILITY LA English DT Note DE LUBRICATION; CERVICAL MUCUS; SPERM MOTILITY; SPERMICIDAL EFFECTS; INFERTILITY C1 USN,NATL NAVAL MED CTR,DEPT GYNECOL & OBSTET,DIV REPROD ENDOCRINOL,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,DEPT OBSTET & GYNECOL,BETHESDA,MD 20814. WALTER REED ARMY MED CTR,DEPT OBSTET & GYNECOL,DIV REPROD ENDOCRINOL,WASHINGTON,DC 20307. OI Opsahl, Michael/0000-0002-8754-7943 NR 5 TC 6 Z9 7 U1 0 U2 3 PU AMER SOC REPRODUCTIVE MEDICINE PI BIRMINGHAM PA 1209 MONTGOMERY HIGHWAY, BIRMINGHAM, AL 35216-2809 SN 0015-0282 J9 FERTIL STERIL JI Fertil. Steril. PD JUN PY 1994 VL 61 IS 6 BP 1171 EP 1173 PG 3 WC Obstetrics & Gynecology; Reproductive Biology SC Obstetrics & Gynecology; Reproductive Biology GA NN391 UT WOS:A1994NN39100032 PM 8194639 ER PT J AU BEHRENDT, JC BLANKENSHIP, DD FINN, CA BELL, RE SWEENEY, RE HODGE, SM BROZENA, JM AF BEHRENDT, JC BLANKENSHIP, DD FINN, CA BELL, RE SWEENEY, RE HODGE, SM BROZENA, JM TI CASERTZ AEROMAGNETIC DATA REVEAL LATE CENOZOIC FLOOD BASALTS(QUESTIONABLE) IN THE WEST ANTARCTIC RIFT SYSTEM SO GEOLOGY LA English DT Article AB The late Cenozoic volcanic and tectonic activity of the enigmatic West Antarctic rift system, the least understood of the great active continental rifts, has been suggested to be plume driven. In 1991-1992, as part of the CASERTZ (Corridor Aerogeophysics of the Southeast Ross Transect Zone) program, an approximately 25 000 km aeromagnetic survey over the ice-covered Byrd subglacial basin shows magnetic ''texture'' critical to interpretations of the underlying extended volcanic terrane. The aeromagnetic data reveal numerous semicircular anomalies approximately 100-1100 nT in amplitude, interpreted as having volcanic sources at the base of the ice sheet; they are concentrated along north-trending magnetic lineations interpreted as rift fabric. Models constrained by coincident radar ice soundings indicate highly magnetic sources, with a probable high remanent magnetization in the present field direction, strongly suggesting a late Cenozoic age. Magnetic anomalies over exposed late Cenozoic volcanic rocks along part of the rift shoulder and in coastal Marie Byrd Land are similar in form and amplitude. The CASERTZ aeromagnetic results, combined with >100000 km of widely spaced aeromagnetic profiles, indicate at least 10(6) km3 of probable late Cenozoic volcanic rock (flood basalt?) in the West Antarctic rift beneath the ice sheet and Ross Ice Shelf. Comparison with other plumes in active rift areas (e.g., Yellowstone and East Africa) indicates that this volume estimate lies in the range of magma generation found in these other low-extension continental rifts. C1 UNIV TEXAS,INST GEOPHYS,AUSTIN,TX 78759. US GEOL SURVEY,DENVER,CO 80225. COLUMBIA UNIV,LAMONT DOHERTY EARTH OBSERV,PALISADES,NY 10964. US GEOL SURVEY,TACOMA,WA 98416. USN,RES LAB,WASHINGTON,DC 20375. RP BEHRENDT, JC (reprint author), US GEOL SURVEY,DENVER FED CTR,MS 964,DENVER,CO 80225, USA. RI Blankenship, Donald/G-5935-2010 NR 25 TC 51 Z9 50 U1 0 U2 3 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD JUN PY 1994 VL 22 IS 6 BP 527 EP & DI 10.1130/0091-7613(1994)022<0527:CADRLC>2.3.CO;2 PG 0 WC Geology SC Geology GA NP194 UT WOS:A1994NP19400012 ER PT J AU ANDERSON, GP GOLDEN, JP CAO, LK WIJESURIYA, D SHRIVERLAKE, LC LIGLER, FS AF ANDERSON, GP GOLDEN, JP CAO, LK WIJESURIYA, D SHRIVERLAKE, LC LIGLER, FS TI DEVELOPMENT OF AN EVANESCENT-WAVE FIBER OPTIC BIOSENSOR SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Article C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD. RI Anderson, George/D-2461-2011 OI Anderson, George/0000-0001-7545-9893 NR 11 TC 34 Z9 34 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 0739-5175 J9 IEEE ENG MED BIOL JI IEEE Eng. Med. Biol. Mag. PD JUN-JUL PY 1994 VL 13 IS 3 BP 358 EP 368 DI 10.1109/51.294007 PG 11 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA NT446 UT WOS:A1994NT44600011 ER PT J AU HARRISON, PR HARRISON, PA AF HARRISON, PR HARRISON, PA TI VALIDATING AN EMBEDDED INTELLIGENT SENSOR CONTROL-SYSTEM SO IEEE EXPERT-INTELLIGENT SYSTEMS & THEIR APPLICATIONS LA English DT Article C1 INTELLICORP,MCLEAN,VA 22102. RP HARRISON, PR (reprint author), USN ACAD,DEPT COMP SCI,572 HOLLOWAY RD,ANNAPOLIS,MD 21402, USA. NR 1 TC 1 Z9 1 U1 0 U2 1 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0885-9000 J9 IEEE EXPERT JI IEEE Expert-Intell. Syst. Appl. PD JUN PY 1994 VL 9 IS 3 BP 49 EP 53 DI 10.1109/64.311279 PG 5 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PD594 UT WOS:A1994PD59400007 ER PT J AU DENNIS, ML DULING, IN AF DENNIS, ML DULING, IN TI EXPERIMENTAL-STUDY OF SIDE-BAND GENERATION IN FEMTOSECOND FIBER LASERS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID NONLINEAR POLARIZATION EVOLUTION; AMPLIFYING LOOP MIRROR; RING LASER; MODE-LOCKING; AVERAGE SOLITON; PULSE FORMATION; OPTICAL PULSES; INSTABILITY; DISPERSION; ROTATION AB We present a thorough experimental investigation of the phenomenon of soliton resonance sideband generation in femtosecond fiber lasers. The dependence of the sideband wavelengths on the dispersion and pulse length is confirmed. Third order dispersion is found to play a significant role in determining the sideband spectrum. We show that the minimum pulse length obtained in a fiber laser is determined by the cavity dispersion and relate this to loss into the sidebands. We show how the sideband spectrum can be used as a diagnostic of the fiber parameters and of the formation of ultrashort pulses in the laser. RP DENNIS, ML (reprint author), USN,RES LAB,CODE 5671,WASHINGTON,DC 20375, USA. NR 51 TC 141 Z9 142 U1 2 U2 19 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD JUN PY 1994 VL 30 IS 6 BP 1469 EP 1477 DI 10.1109/3.299472 PG 9 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NY854 UT WOS:A1994NY85400018 ER PT J AU MORGAN, MA AF MORGAN, MA TI ULTRA-WIDE-BAND IMPULSE SCATTERING MEASUREMENTS SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article AB A recently upgraded laboratory is described for measurement of ultra-wideband (1-20 GHz) impulse scattering responses from scale model radar targets. A linear systems model is introduced, leading to new measurement concepts and signal processing algorithms for estimating the target's scattering response to a user-defined impulse waveform. The experimental and processing procedures serve to eliminate clutter and antenna coupling, while compensating for antenna characteristics in the system. Experimental validations are examined and planned enhancements are discussed. RP MORGAN, MA (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 13 TC 14 Z9 18 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 JUN PY 1994 VL 42 IS 6 BP 840 EP 846 DI 10.1109/8.301704 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NY452 UT WOS:A1994NY45200010 ER PT J AU ANDERSON, GP GOLDEN, JP LIGLER, FS AF ANDERSON, GP GOLDEN, JP LIGLER, FS TI AN EVANESCENT-WAVE BIOSENSOR .1. FLUORESCENT SIGNAL ACQUISITION FROM STEP-ETCHED FIBER OPTIC PROBES SO IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING LA English DT Article ID IMMUNOASSAY AB A fiber-optic biosensor capable of remote continuous monitoring has recently been designed. To permit sensing at locations separate from the optoelectronic instrumentation, long optical fibers are utilized. An evanescent wave immuno-probe is prepared by removing the cladding near the distal end of the fiber and covalently attaching antibodies to the core. Probes with a radius unaltered from that of the original core inefficiently returned the signal produced upon binding the fluorescent-labelled antigen. To elucidate the limiting factors in signal acquisition, a series of fibers with increasingly reduced probe core radius was examined. The results were consistent with the V-number mismatch, the difference in mode carrying capacity between the dad and unclad fiber, being a critical factor in limiting signal coupling from the fiber probe. However, it was also delineated that conditions which conserve excitation power, such that power in the evanescent wave is optimized, must also be met to obtain a maximal signal. The threshold sensitivity for the optimal step-etched fiber probe was improved by over 20-fold in an immunoassay, although, it was demonstrated that signal acquisition decreased along the probe length, suggesting that a sensor region of uniform radius is hot ideal. RP ANDERSON, GP (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. RI Anderson, George/D-2461-2011 OI Anderson, George/0000-0001-7545-9893 NR 19 TC 30 Z9 41 U1 1 U2 9 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9294 J9 IEEE T BIO-MED ENG JI IEEE Trans. Biomed. Eng. PD JUN PY 1994 VL 41 IS 6 BP 578 EP 584 DI 10.1109/10.293245 PG 7 WC Engineering, Biomedical SC Engineering GA NX628 UT WOS:A1994NX62800008 PM 7927377 ER PT J AU GOLDEN, JP ANDERSON, GP RABBANY, SY LIGLER, FS AF GOLDEN, JP ANDERSON, GP RABBANY, SY LIGLER, FS TI AN EVANESCENT-WAVE BIOSENSOR .2. FLUORESCENT SIGNAL ACQUISITION FROM TAPERED FIBER OPTIC PROBES SO IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING LA English DT Article AB A biosensor was developed using antibodies, fluorescence and the evanescent wave to detect antigen binding at the surface of an optical fiber. Cladding was removed from the core along the distal end of a step-index optical fiber, and recognitions antibodies were immobilized on the declad core to form the probe sensing region. Immersing the declad probe in aqueous solution creates a V-number mismatch between the immersed probe and the clad fiber. Probes created with reduced sensing region radius exhibited improved response hy decreasing the V-number mismatch. Tapering the radius of this region has further improved probe response. Ray tracing analysis of the tapered probe demonstrated that the evanescent wave penetration depth increases along the length of the taper. Experiments correlating position of refraction along the taper with launch angle at the proximal end were realized lin the ray tracing model. An evanescent wave immunoassay was performed with a series of the tapered fiber probes, each tapered from the fiber core radius (100 mu m) to different end radii. An end radius of 29 mu m was Found to produce maximal signal from the tapered probe. Factors leading to the determination of the optimized probe are discussed. C1 HOFSTRA UNIV,DEPT ENGN,BIOENGN PROGRAM,HEMPSTEAD,NY 11550. RP GOLDEN, JP (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. RI Anderson, George/D-2461-2011 OI Anderson, George/0000-0001-7545-9893 NR 20 TC 60 Z9 72 U1 0 U2 9 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9294 J9 IEEE T BIO-MED ENG JI IEEE Trans. Biomed. Eng. PD JUN PY 1994 VL 41 IS 6 BP 585 EP 591 DI 10.1109/10.293246 PG 7 WC Engineering, Biomedical SC Engineering GA NX628 UT WOS:A1994NX62800009 PM 7927378 ER PT J AU PACE, PE RAMAMOORTHY, PA STYER, D AF PACE, PE RAMAMOORTHY, PA STYER, D TI A PREPROCESSING ARCHITECTURE FOR RESOLUTION ENHANCEMENT IN HIGH-SPEED ANALOG-TO-DIGITAL CONVERTERS SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING LA English DT Article ID ADC AB High performance analog-to-digital converters (ADC's) employ a parallel configuration of analog folding circuits to symmetrically fold the input signal prior to quantization by high speed comparators (analog preprocessing). This paper identifies a new preprocessing approach that can be easily incorporated into the established techniques to provide an enhanced resolution capability with fewer number of comparators loaded in parallel. The approach is based on preprocessing the analog signal with a symmetrical number system (SNS). The SNS preprocessing is used to decompose the analog amplitude analyzer operation into a number of sub-operations (moduli) which are of smaller computational complexity. Each sub-operation symmetrically folds the analog signal with folding period equal to the moduli. Thus, each sub-operation only requires a precision in accordance with that modulus. A much higher resolution is achieved after the N different SNS moduli are used and the results of these low precision sub-operations are recombined. By incorporating the SNS folding concept, the dynamic range of a specific configuration of folding periods and comparator arrangements can be analyzed exactly. C1 UNIV CINCINNATI,DEPT ELECT & COMP ENGN,CINCINNATI,OH 45221. UNIV CINCINNATI,DEPT MATH,CINCINNATI,OH 45221. RP PACE, PE (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC-PC,MONTEREY,CA 93943, USA. NR 13 TC 21 Z9 21 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 1057-7130 J9 IEEE T CIRCUITS-II JI IEEE Trans. Circuits Syst. II-Analog Digit. Signal Process. PD JUN PY 1994 VL 41 IS 6 BP 373 EP 379 DI 10.1109/82.300194 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA NY862 UT WOS:A1994NY86200001 ER PT J AU CAMPBELL, A MCDONALD, P GONYEA, R REEVES, M AF CAMPBELL, A MCDONALD, P GONYEA, R REEVES, M TI RESULTS FROM THE CRRES MEP EXPERIMENT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 2nd European Conference on Radiations and their Effects on Components and Systems (RADECS 93) CY SEP 13-16, 1993 CL ST MALO, FRANCE ID FLIGHT DATA; SPACE AB The effects of space radiation on microelectronics devices will be presented as measured by the Microelectronics Package Space Experiment on the Combined Release and Radiation Effects Satellite. RP CAMPBELL, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD JUN PY 1994 VL 41 IS 3 BP 432 EP 437 DI 10.1109/23.299780 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA NU414 UT WOS:A1994NU41400003 ER PT J AU GRISCOM, DL GINGERICH, ME FRIEBELE, EJ AF GRISCOM, DL GINGERICH, ME FRIEBELE, EJ TI MODEL FOR THE DOSE, DOSE-RATE AND TEMPERATURE-DEPENDENCE OF RADIATION-INDUCED LOSS IN OPTICAL FIBERS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 2nd European Conference on Radiations and their Effects on Components and Systems (RADECS 93) CY SEP 13-16, 1993 CL ST MALO, FRANCE ID SIO2 AB We propose, and verify in the case of a Ge-doped-silica-core optical fiber, a general explanation for the power-law dependencies on dose frequently observed for the radiation-induced attenuation in optical fibers. This insight permits detailed prediction of the post-irradiation recovery curves, given just the empirical exponent of the power law, 0 2AlO2- + 4H2O E = 2.3 V C1 CLARK UNIV,DEPT CHEM,WORCESTER,MA 01610. RP MARSH, C (reprint author), USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841, USA. NR 12 TC 18 Z9 18 U1 0 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 JUN PY 1994 VL 141 IS 6 BP L61 EP L63 DI 10.1149/1.2054987 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NQ338 UT WOS:A1994NQ33800001 ER PT J AU ACKERMAN, JR LEBOW, PS AF ACKERMAN, JR LEBOW, PS TI DEMONSTRATION OF THE SPECTRAL AND THE GEOMETRICAL CRITERIA THAT CONTROL HIGH-REFLECTIVITY BRILLOUIN-ENHANCED 4-WAVE-MIXING SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID SCATTERING; FREQUENCY; INSTABILITY AB The interplay between frequency and geometry in high-reflectivity Brillouin-enhanced four-wave mixing (BEFWM) is examined. We obtain detailed knowledge of the frequency relationship among all four interacting beams by using a unique laser system that directly supplies all three BEFWM input beams with independent and precise relative frequency control and by analyzing the phase-conjugate output spectrum. In accordance with an existing model, geometry measurements clearly confirm an inverse relationship between pump-pump and pump-signal angles when the input frequencies are fixed, and the total phase mismatch is found to be constant over a broad range of spectrally and spatially diverse BEFWM conformations. Output detunings similar to previously reported input detunings are observed. Line-shape analysis of the various resonances supports the concept that high-reflectivity BEFWM arises from the formation of distinct read and write gratings and that the energy transfer between them is controlled by a relatively broad phase-mismatch range. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ACKERMAN, JR (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 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 JUN PY 1994 VL 11 IS 6 BP 1000 EP 1008 DI 10.1364/JOSAB.11.001000 PG 9 WC Optics SC Optics GA NR126 UT WOS:A1994NR12600006 ER PT J AU WANG, JK SIEGAL, Y LU, C MAZUR, E REINTJES, J AF WANG, JK SIEGAL, Y LU, C MAZUR, E REINTJES, J TI SUBPICOSECOND STIMULATED RAMAN-SCATTERING IN HIGH-PRESSURE HYDROGEN SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article AB We studied the effect of self-phase modulation and self-focusing on transient stimulated Raman scattering in high-pressure hydrogen by using high-energy, subpicosecond laser pulses. Adding argon to the hydrogen emphasizes the effect of self-phase modulation on stimulated Raman scattering by increasing the former effect without affecting the latter. The behavior of the observed stimulated Raman scattering falls into three regimes depending on input energy: normal stimulated Raman scattering at low energies, suppression by self-phase modulation at medium energies, and a recovery at high energies because strong self-focusing limits self-phase modulation. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP HARVARD UNIV, GORDON MCKAY LAB, CAMBRIDGE, MA 02138 USA. RI Mazur, Eric/B-8918-2009; Wang, Juen-Kai/F-7932-2012 NR 15 TC 32 Z9 33 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0740-3224 EI 1520-8540 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD JUN PY 1994 VL 11 IS 6 BP 1031 EP 1037 DI 10.1364/JOSAB.11.001031 PG 7 WC Optics SC Optics GA NR126 UT WOS:A1994NR12600009 ER PT J AU MITCHELL, JD LEE, R HODAKOWSKI, GT NEYA, K HARRINGER, W VALERI, CR VLAHAKES, GJ AF MITCHELL, JD LEE, R HODAKOWSKI, GT NEYA, K HARRINGER, W VALERI, CR VLAHAKES, GJ TI PREVENTION OF POSTOPERATIVE PERICARDIAL ADHESIONS WITH A HYALURONIC-ACID COATING SOLUTION - EXPERIMENTAL SAFETY AND EFFICACY STUDIES SO JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY LA English DT Article ID POLYTETRAFLUOROETHYLENE SURGICAL MEMBRANE; PERITONEAL FIBRINOLYTIC-ACTIVITY; TISSUE PLASMINOGEN-ACTIVATOR; INTRAABDOMINAL ADHESIONS; SODIUM HYALURONATE; CLOSURE; MODEL; OPERATIONS; ABILITY; SURGERY AB Postoperative pericardial adhesions complicate reoperative cardiac procedures. Topical application of solutions containing hyaluronic acid have been shown to reduce adhesions after abdominal and orthopedic surgery. The mechanism by which hyaluronic acid solutions prevent adhesion formation is unknown but may be due to a cytoprotective effect on mesothelial surfaces, which would Limit intraoperative injury. In this study, we tested the efficacy and safety of hyaluronic acid coating solutions for the prevention of postoperative intrapericardial adhesion formation. Eighteen mongrel dogs underwent median sternotomy and pericardiotomy followed by a standardized 2-hour protocol of forced warm air desiccation and abrasion of the pericardial and epicardial surfaces. Group 1 (n = 6) served as untreated control animals. Group 2 (n = 6) received topical administration of 0.4% hyaluronic acid in phosphate-buffered saline solution at the time of pericardiotomy, at 20-minute intervals during the desiccation/abrasion protocol, and at pericardial closure. The total test dose was less than 1% of the circulating blood volume. Group 3 (n = 6) served as a vehicle control, receiving phosphate-buffered saline solution as a topical agent in a fashion identical to that used in group 2. At resternotomy 8 weeks after the initial operation, the intrapericardial adhesions were graded on a 0 to 4 severity scale at seven different areas covering the ventricular, atrial, and great vessel surfaces. In both the untreated control (group 1, mean score 3.2 +/- 0.4) and vehicle control (group 3, mean score 3.3 +/- 0.2) animals, dense adhesions were encountered. In contrast, animals treated with the hyaluronic acid solution (group 2, mean score 0.8 +/- 0.3) characteristically had no adhesions or filmy, transparent adhesions graded significantly less severe than either the untreated control (group 2 versus group 1, p < 0.001) or vehicle control (group 2 versus group 3, p < 0.001) animals. In separate experiments, six baboons were infused with 0.4% hyaluronic acid in phosphate-buffered saline solution in volumes equivalent to 2.5%, 5%, and 10% of the measured circulating blood volume. The 2.5% and 5% infusions had no effect on the parameters measured; infusion of the 10% volume produced transient hemodynamic, coagulation, and gas exchange abnormalities. Hyaluronic acid solutions are efficacious in the prevention of pericardial adhesions in this model, and they appear safe in doses five times the amount needed to prevent adhesions. Further studies investigating the mechanism by which these solutions prevent adhesions, their optimal dose and method of application, and documentation of their safe use in humans are warranted. C1 MASSACHUSETTS GEN HOSP,DEPT SURG,CARDIAC SURG UNIT,BOSTON,MA 02114. HARVARD UNIV,SCH MED,BOSTON,MA. BOSTON UNIV,SCH MED,USN,BLOOD RES LAB,BOSTON,MA 02118. NR 38 TC 40 Z9 41 U1 0 U2 4 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-5223 J9 J THORAC CARDIOV SUR JI J. Thorac. Cardiovasc. Surg. PD JUN PY 1994 VL 107 IS 6 BP 1481 EP 1488 PG 8 WC Cardiac & Cardiovascular Systems; Respiratory System; Surgery SC Cardiovascular System & Cardiology; Respiratory System; Surgery GA NQ769 UT WOS:A1994NQ76900018 PM 8196393 ER PT J AU GUBLER, KD GENTILELLO, LM HASSANTASH, SA MAIER, RV AF GUBLER, KD GENTILELLO, LM HASSANTASH, SA MAIER, RV TI THE IMPACT OF HYPOTHERMIA ON DILUTIONAL COAGULOPATHY SO JOURNAL OF TRAUMA-INJURY INFECTION AND CRITICAL CARE LA English DT Article; Proceedings Paper CT 53rd Annual Session of the American-Association-for-the-Surgery-of-Trauma CY SEP 23-25, 1992 CL NEW ORLEANS, LA SP AMER ASSOC SURG TRAUMA ID MASSIVE TRANSFUSION; INJURED PATIENTS; SURVIVAL AB The control of hemorrhage in hypothermic patients with platelet and clotting factor depletion is often impossible. Determining the cause of coagulopathic bleeding (CB) will enable physicians to appropriately focus on rewarming, clotting factor repletion, or both. Objective: To determine the contribution of hypothermia in producing CB and ascertain if simultaneous hypothermia and dilutional coagulopathy (DC) interact synergistically. Method: Prothrombin time, partial thromboplastin time, and platelet function were determined at assay temperatures of 29-degrees to 37-degrees-C on normal and critically ill, noncoagulopathic (NC) individuals. Dilutional coagulopathy was created using buffered saline and the assays repeated. Results: Hypothermic assay at less-than-or-equal-to 35-degrees-C significantly prolonged coagulation times. The effect of hypothermia on NC and DC samples was not different. Conclusion: Assays performed at 37-degrees-C underestimate coagulopathy in hypothermic patients. The effect of hypothermia on NC and DC is not different, indicating the lack of a synergistic effect. Normalization of clotting requires both rewarming and clotting factor repletion. C1 UNIV WASHINGTON,SCH MED,DEPT SURG,SEATTLE,WA 98195. HARBORVIEW INJURY PREVENT & RES CTR,SEATTLE,WA. RP GUBLER, KD (reprint author), USN HOSP,DEPT SURG,SAN DIEGO,CA 92134, USA. FU NIAAA NIH HHS [NIAAA R01-AA-07116]; NIDCD NIH HHS [CDC R40-CCR-00-2750] NR 15 TC 95 Z9 98 U1 0 U2 4 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1079-6061 J9 J TRAUMA JI J. Trauma-Injury Infect. Crit. Care PD JUN PY 1994 VL 36 IS 6 BP 847 EP 851 DI 10.1097/00005373-199406000-00015 PG 5 WC Critical Care Medicine; Surgery SC General & Internal Medicine; Surgery GA NV458 UT WOS:A1994NV45800023 PM 8015007 ER PT J AU KELLY, PJ BEATI, L MATTHEWMAN, LA MASON, PR DASCH, GA RAOULT, D AF KELLY, PJ BEATI, L MATTHEWMAN, LA MASON, PR DASCH, GA RAOULT, D TI A NEW PATHOGENIC SPOTTED-FEVER GROUP RICKETTSIA FROM AFRICA SO JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article DE AFRICA; SFG RICKETTSIA; TICK-BITE FEVER; AMBLYOMMA HEBRAEUM ID LENGTH-POLYMORPHISM ANALYSIS; POLYMERASE CHAIN-REACTION; TICK-BITE FEVER; GENOTYPIC IDENTIFICATION; GEL-ELECTROPHORESIS; ZIMBABWE; CENTRIFUGATION; ANTIBODIES; INFECTIONS; PROTEIN AB A spotted fever group (SFG) rickettsia was isolated in Zimbabwe from a patient with tick-bite, fever, headache and regional lymphadenopathy. A further six isolates were obtained from Amblyomma hebraeum ticks collected in Zimbabwe. These human and tick isolates were indistinguishable from each other, and from an Ethiopian SFG rickettsia, by microimmunofluorescence (MIF), sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE), Western blotting and polymerase chain reaction followed by restriction fragment length polymorphism analysis (PCR-RFLP). They were, however, distinguishable from other SFG rickettsiae by MIF serotyping and in the case of the most closely related serotypes, Rickettsia conorii and the Israeli SFG rickettsia, by SDS-PAGE and Western blot. PCR-RFLP failed to distinguish between the Zimbabwean and Israeli SFG rickettsia, though each of these gave different digestion products from R. conorii. The Zimbabwean human and tick isolates and the Ethiopian SFG rickettsiae therefore represent a previously undescribed rickettsial serotype which apparently is pathogenic in human beings. It is proposed that the new serotype be named the agent of African tick-bite fever in order to distinguish it from R. conorii, which until now has been recognized as the only SFG rickettsia to infect man in Africa. C1 UNIV ZIMBABWE,FAC MED,HARARE,ZIMBABWE. FAC MED MARSEILLE,CTR NATL REFERENCE,UNITE RICKETSIES,F-13385 MARSEILLE,FRANCE. USN,MED RES INST,BETHESDA,MD. RP KELLY, PJ (reprint author), UNIV ZIMBABWE,FAC VET SCI,POB MP 167,HARARE,ZIMBABWE. NR 39 TC 42 Z9 42 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0022-5304 J9 J TROP MED HYG JI J. Trop. Med. Hyg. PD JUN PY 1994 VL 97 IS 3 BP 129 EP 137 PG 9 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA NQ773 UT WOS:A1994NQ77300001 PM 7911846 ER PT J AU OLSEN, EA WINTERFORD, D AF OLSEN, EA WINTERFORD, D TI ASIAN MULTILATERALISM - IMPLICATIONS FOR UNITED-STATES-POLICY SO KOREAN JOURNAL OF DEFENSE ANALYSIS LA English DT Article AB During the Cold War security in Asia was dominated by several bilateral relationships between the United States and its Asian partners. In post-Cold War Asia there is growing interest in multilateralism for enhancing regional security. The Clinton administration refers to a ''new Pacific community'' and has indicated interest in multilateral fora for discussing trade and security issues. However, like its predecessor, the administration has not developed a coordinated policy toward Asia. While there has been a new emphasis on trade policy, in terms of security there is greater continuity with the Bush administration, and Consequently, despite the Clinton administration's ''bottom-up'' review of US defense programs, there has been very little change in Washington's strategic thinking concerning Asia. Instead of shaping a new US geopolitical vision for post-Cold War Asia, the administration muddles through from bilateralism toward multilateral structures. Although multilateralism may hold the promise of injecting balance and reciprocity into security relations, it confronts several major pitfalls that may undermine its prospects for success. This paper examines three of the most significant of these obstacles: the existence of multiple instances of ''double containment'' in America's security policies toward Asia; the unpredictability of post-Cold War Asian regional political dynamics; and the difficulty of devising a new multilateralist surrogate for old US ideological motives in post-Cold War Asia. This paper argues that during the Cold War the United States crafted bilateral relations with Japan and South Korea aimed not only at containing the Soviet Union, China, and North Korea but restraining its own two treaty allies as well. That is, America's strategy in Asia rested on two sets of ''double containment.'' In effect, US policy rested on ''double containment.2'' By linking two seemingly separate bilateral security arrangements embodying double-containment aspects, Washington geometrically multiplied the impact of its containment of its two allies within the larger anticommunist containment approach. The paper examines the rationale, nuances, and structure of the two Northeast Asian versions of double containment. Given current realities in Northeast Asia, the paper argues that double-containment2 is not only fully functional in the 1990s but it also continues to shape the security parameters of China, Taiwan, Southeast Asia and Oceania. The paper suggests that, as it did during the Cold War, Northeast Asian double containment continues to undermine moves toward a broader network of overall Asian collective security and may well foredoom such efforts to failure. Problems in Northeast Asia pose a second obstacle in the way of effective multilateralism. For example, if events in Korea were to take a dramatic turn for the worse or in case of territorial conflict between Russia and Japan, it is not hard to visualize a rupture in US-Japan security ties. Such events would cause grave problems for overall Asian multilateralism since many Asian states do not share common security perceptions on these Northeast Asian issues. Most Asian states do seem to want Washington to stay engaged militarily in Asia, but Washington's new interest in multilateralism may stem from it desire to shift burdens to regional powers, to thwart the great power aspirations of regional actors by harnessing them collectively in ways reminiscent of containment, and to maximize multilateral Asian strategic dependence on the United States to increase American economic leverage. Finally, in examining a third major obstacle to multilateralism, the paper argues that a sustained American commitment to multilateral security structures in post-Cold War Asia requires linking these new arrangements to deeply felt American economic, political, and ideological interests. Asian governments have learned that post-Cold War America is still seeking to reshape Asian economic and political systems, and American ideological goals continue to inject tensions likely to undermine multilateral structures. Ironically, Washington may find to its dismay that part of the appeal of multilateralism to Asia is the prospective benefit it may offer in containing the United States. Are American policy-makers prepared to accept this restraint? The paper concludes by suggesting the choice is not between accepting or rejecting multilateralism but rather determining which variant of multilateralism might be most successful. It suggests that an appropriate framework is likely to be a loosely structured Pax Condominia, a form of multilateralism with Asian as well as American characteristics. RP OLSEN, EA (reprint author), USN,POSTGRAD SCH,DEPT NATL SECUR AFFAIRS,MONTEREY,CA 93940, USA. NR 37 TC 0 Z9 0 U1 0 U2 5 PU KOREAN INST DEFENSE ANALYSES PI SEOUL PA OFFICE RESEARCH COOPERATION, PO BOX 250, SEOUL 130-650, SOUTH KOREA SN 1016-3271 J9 KOREAN J DEF ANAL JI Korean J. Def. Anal. PD SUM PY 1994 VL 6 IS 1 BP 9 EP 40 PG 32 WC International Relations SC International Relations GA PD256 UT WOS:A1994PD25600001 ER PT J AU STERN, NJ JONES, DM WESLEY, IV ROLLINS, DM AF STERN, NJ JONES, DM WESLEY, IV ROLLINS, DM TI COLONIZATION OF CHICKS BY NON-CULTURABLE CAMPYLOBACTER SPP SO LETTERS IN APPLIED MICROBIOLOGY LA English DT Article ID ANTIGENIC VARIATION; JEJUNI; RECOVERY AB Six suspensions of non-culturable Campylobacter spp. were administered by gavage to day-of-hatch chicks. Four non-culturable isolates of Campylobacter spp. were found to colonize low numbers (5/79) of 1-week-old chicks, while two isolates did not (0/30). The original and recovered Campylobacter spp. isolates were serotyped and examined by restriction enzyme analysis. Evidence of clonality of two Camp. jejuni isolates was demonstrated. C1 USDA ARS,NATL ANIM DIS CTR,AMES,IA 50010. PUBL HLTH LAB SERV,MANCHESTER,ENGLAND. USN,MED RES INST,BETHESDA,MD 20814. RP STERN, NJ (reprint author), USDA ARS,RICHARD B RUSSELL AGR RES CTR,POULTRY MICROBIOL SAFETY RES UNIT,POB 5677,ATHENS,GA 30613, USA. NR 13 TC 79 Z9 80 U1 1 U2 3 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0266-8254 J9 LETT APPL MICROBIOL JI Lett. Appl. Microbiol. PD JUN PY 1994 VL 18 IS 6 BP 333 EP 336 DI 10.1111/j.1472-765X.1994.tb00882.x PG 4 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA NR400 UT WOS:A1994NR40000008 ER PT J AU COOK, AA AF COOK, AA TI ILLNESS AND INJURY AMONG UNITED-STATES PRISONERS OF WAR FROM OPERATION DESERT-STORM SO MILITARY MEDICINE LA English DT Article AB United States prisoners of war had to endure a variety of medical problems during Operations Desert Shield and Desert Storm. All but one of the prisoners suffered some form of injury or illness. Orthopedic injuries were most common. Hematologic, dermatologic, neurologic, and infectious disorders were also noted. Some injuries were combat-related and others were due to mistreatment during incarceration. The prisoners' condition upon repatriation reflected their limited access to appropriate medical care, sanitation, and nutritional support. RP COOK, AA (reprint author), USN HOSP,DEPT NEUROL,OAKLAND,CA 94627, USA. NR 0 TC 1 Z9 1 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 JUN PY 1994 VL 159 IS 6 BP 437 EP 442 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA PG420 UT WOS:A1994PG42000006 PM 7984301 ER PT J AU HABERBERGER, RL SCOTT, DA THORNTON, SA HYAMS, KC AF HABERBERGER, RL SCOTT, DA THORNTON, SA HYAMS, KC TI DIARRHEAL DISEASE ABOARD A UNITED-STATES-NAVY SHIP AFTER A BRIEF PORT VISIT TO A HIGH-RISK AREA SO MILITARY MEDICINE LA English DT Article AB In August 1988, a study was conducted to determine the etiology and risk factors associated with travelers' diarrhea among U.S. military personnel after a 5-day port visit to Alexandria, Egypt. Twenty-one percent of the 2,747 evaluated crew members of the USS John F. Kennedy reported an episode of acute diarrhea, which led to 155 sick-call visits and at least 110 lost man-days. The most common pathogen identified was enterotoxigenic Escherichia coli, and all isolated bacterial enteropathogens were sensitive to quinolone drugs. Independent risk factors for the development of diarrhea included: (1) consuming any meal ashore and specifically eating meats, desserts, or a buffet meal; and (2) a recent history of travelers' diarrhea. These data indicate that even brief port visits to developing countries pose a major threat to the health of U.S. shipboard personnel. RP HABERBERGER, RL (reprint author), USN,DIV BACTERIOL,MED RES UNIT 3,PSC 452,BOX 5000,FPO,AE 09835, USA. NR 0 TC 13 Z9 13 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 JUN PY 1994 VL 159 IS 6 BP 445 EP 448 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA PG420 UT WOS:A1994PG42000008 PM 7984303 ER PT J AU BLOOD, CG GAUKER, ED JOLLY, R PUGH, WM AF BLOOD, CG GAUKER, ED JOLLY, R PUGH, WM TI COMPARISONS OF CASUALTY PRESENTATION AND ADMISSION RATES DURING VARIOUS COMBAT OPERATIONS SO MILITARY MEDICINE LA English DT Article AB Daily causalty rates were analyzed and compared for four ground operations: Okinawa, Korea, Vietnam, and the Falklands. Daily admission rates of wounded-in-action (WIA) for combat troops ranged from 1.61 to 5.54 per 1,000 strength. The killed-in-action rates of combat troops ranged from 0.2 to 1.35. Support troop WIA admission rates ranged from 0.05 to 0.43 per 1,000 strength per day. Among wounded combat troops, the mean number of sick days before return to duty were 4.3 and 5.1 days for two different operations. RP BLOOD, CG (reprint author), USN,HLTH RES CTR,MED INFORMAT SYST & OPERAT RES DEPT,POB 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 7 Z9 8 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 JUN PY 1994 VL 159 IS 6 BP 457 EP 461 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA PG420 UT WOS:A1994PG42000011 PM 7984306 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI PLOWSHARES INTO SWORDS - ARMS RACES IN INTERNATIONAL-POLITICS, 1840-1991 - HAMMOND,GT SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MILLENNIUM-J INT STUD PI LONDON PA LONDON SCHOOL ECONOMICS HOUGHTON ST, LONDON, ENGLAND WC2A 2AE SN 0305-8298 J9 MILLENNIUM-J INT ST JI Millennium-J. Int. Stud. PD SUM PY 1994 VL 23 IS 2 BP 453 EP 454 PG 2 WC International Relations SC International Relations GA PL293 UT WOS:A1994PL29300028 ER PT J AU ONDRISCRAWFORD, RJ CRAWFORD, GP AF ONDRISCRAWFORD, RJ CRAWFORD, GP TI LIQUID-CRYSTALS - A BRIDGE BETWEEN SCIENCE AND TECHNOLOGY SO MRS BULLETIN LA English DT Article RP ONDRISCRAWFORD, RJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD JUN PY 1994 VL 19 IS 6 BP 67 EP 68 PG 2 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA NT036 UT WOS:A1994NT03600011 ER PT J AU MCKENNA, TM MCMULLEN, TA SHLESINGER, MF AF MCKENNA, TM MCMULLEN, TA SHLESINGER, MF TI THE BRAIN AS A DYNAMIC PHYSICAL SYSTEM SO NEUROSCIENCE LA English DT Review ID VISUAL-CORTEX; INFERIOR OLIVE; PATTERN-RECOGNITION; BACKGROUND ACTIVITY; NEURONAL RESPONSES; MODEL; INVITRO; INTEGRATION; OSCILLATORS; MONKEY AB The brain is a dynamic system that is non-linear at multiple levels of analysis. Characterization of its non-linear dynamics is fundamental to our understanding of brain function. Identifying families of attractors in phase space analysis, an approach which has proven valuable in describing non-linear mechanical and electrical systems, can prove valuable in describing a range of behaviors and associated neural activity including sensory and motor repertoires. Additionally, transitions between attractors may serve as useful descriptors for analysing state changes in neurons and neural ensembles. Recent observations of synchronous neural activity, and the emerging capability to record the spatiotemporal dynamics of neural activity by voltage-sensitive dyes and electrode arrays, provide opportunities for observing the population dynamics of neural ensembles within a dynamic systems context. New developments in the experimental physics of complex systems, such as the control of chaotic systems, selection of attractors, attractor switching and transient slates, can be a source of powerful new analytical tools and insights into the dynamics of neural systems. C1 OFF NAVAL RES, DIV PHYS, ARLINGTON, VA 22217 USA. RP MCKENNA, TM (reprint author), OFF NAVAL RES, DIV COGNIT & NEURAL SCI, CODE 342 CN, 800 N QUINCY ST, ARLINGTON, VA 22217 USA. NR 107 TC 58 Z9 59 U1 0 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0306-4522 J9 NEUROSCIENCE JI Neuroscience PD JUN PY 1994 VL 60 IS 3 BP 587 EP 605 DI 10.1016/0306-4522(94)90489-8 PG 19 WC Neurosciences SC Neurosciences & Neurology GA NN295 UT WOS:A1994NN29500002 PM 7936189 ER PT J AU HUBLER, GK DONOVAN, EP GOSSETT, CR AF HUBLER, GK DONOVAN, EP GOSSETT, CR TI ION-BEAM-ASSISTED DEPOSITION OF HYDROGENATED AMORPHOUS-SILICON NITRIDE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7th International Conference on Radiation Effects in Insulators (REI-7) CY SEP 06-10, 1993 CL NAGOYA, JAPAN SP NAGOYA UNIV FDN, AICHI PERFECTURE, NAGOYA CITY, DAIKO FDN, INT SCI FDN, JAPAN WORLD EXPOSIT COMMEMORATE FUND, NIPPON SHEET GLASS FDN MAT SCI, SHIMAZU SCI FDN, ASAHI GLASS FDN, KASHIMA FDN, JAPAN IRON & STEEL FEDERAT, MURATA SCI FDN, ELSEVIER SCI B V, HITACHI LTD, MATSUSHITA ELECT IND CO LTD, NIPPON STEEL CORP, CHUBU ELECT POWER CO INC, TOSHIBA CORP, TOYOTA MOTOR CORP ID FUNDAMENTALS AB Hydrogenated silicon nitride films were produced near room temperature by electron beam evaporation of Si and simultaneous bombardment with a 500 eV ammonia ion beam from a Kaufman ion source and for a variety of ratios of incident charge to evaporant fluxes. The composition of N, Si and H in the films as a function of ion current density was measured by means of Rutherford backscattering and elastic recoil detection analyses. Reflection and transmission spectroscopy in the wavelength range 400 nm to 3125 nm were employed to measure optical thickness and refractive index. From the data we extracted the number of nitrogen atoms in the ammonia beam per unit charge collected, the sputtering coefficient for ammonia incident on Si, and the refractive index versus composition of the alloys. At the highest N composition, the films were clear in the visible with the UV cut-off less than 400 nm, the index was 1.80 which is lower than that of pure Si3N4 and the H content was as high as 27 at.%. RP HUBLER, GK (reprint author), USN,RES LAB,CODE 6671,WASHINGTON,DC 20375, USA. NR 8 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1994 VL 91 IS 1-4 BP 540 EP 544 DI 10.1016/0168-583X(94)96282-0 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NR935 UT WOS:A1994NR93500100 ER PT J AU VANLIESHOUT, L DEJONGE, N ELMASRY, N MANSOUR, MM BASSILY, S KRIJGER, FW DEELDER, AM AF VANLIESHOUT, L DEJONGE, N ELMASRY, N MANSOUR, MM BASSILY, S KRIJGER, FW DEELDER, AM TI MONITORING THE EFFICACY OF DIFFERENT DOSES OF PRAZIQUANTEL BY QUANTIFICATION OF CIRCULATING ANTIGENS IN SERUM AND URINE OF SCHISTOSOMIASIS PATIENTS SO PARASITOLOGY LA English DT Article DE SCHISTOSOMIASIS; PRAZIQUANTEL; BILTRICIDE(R); DISTOCIDE(R); DRUG EFFICACY; CIRCULATING ANODIC ANTIGEN (CAA); CIRCULATING CATHODIC ANTIGEN (CCA) ID ANODIC ANTIGEN; CATHODIC ANTIGEN; MONOCLONAL-ANTIBODIES; MANSONI INFECTION; CHEMOTHERAPY; INDIVIDUALS; DIAGNOSIS; CURE; CAA; IMMUNOASSAY AB We evaluated the quantitation of two schistosome circulating antigens in serum and urine as a tool for the assessment of the efficacy of praziquantel dosage regimens (40 versus 60 mg/kgbw). In addition we compared the efficacy of two different brands of praziquantel (Biltricide(R) and Distocide(R)), given at the same dosage (40 mg/kgbw). Thirty five Egyptian hospitalized schistosomiasis mansoni patients participated in this study. Thirteen patients (Group 1) received 60 mg/kgbw Biltricide(R), administered in 3 oral doses of 20 mg in one day; 22 individuals (Group 2) were treated with 40 mg/kgbw (12 Biltricide(R), 10 Distocide(R)), given in one oral dose. Circulating anodic antigen (CAA) and circulating cathodic antigen (CCA) were quantitated by monoclonal antibody-based ELISA's before, and 1, 3 and 6 weeks after chemotherapy. Before treatment, all patients were positive for at least one of the circulating antigen assays. Three to six weeks after treatment significantly more patients were found to be negative in Group 1 compared to Group 2 (X(2) = 7.13, P = 0.008, n = 35). Also the levels of CCA and CAA in serum and of CCA in urine were found to be significantly higher in Group 2 (Mann-Whitney U < 85, P < 0.05, n = 35). These results were confirmed by parasitological data. No differences were found between treatment with Biltricide(R) or Distocide(R). Our results indicate that praziquantel treatment of schistosomiasis with 60 mg/kgbw divided in 3 doses results in a higher cure rate compared to 40 mg/kgbw as a single dose, and provide further evidence for the use of the CAA and CCA assays as a sensitive method to monitor the efficacy of chemotherapy, particularly when circulating antigen assays are combined by parallel testing. C1 USN,MED RES UNIT 3,CAIRO 09835,EGYPT. DIAGNOST CTR SSDZ,DEPT CLIN CHEM,2600 GA DELFT,NETHERLANDS. RP VANLIESHOUT, L (reprint author), LEIDEN UNIV,FAC MED,PARASITOL LAB,POB 9605,2300 RC LEIDEN,NETHERLANDS. RI de Jonge, Niels/A-1786-2012 NR 32 TC 33 Z9 33 U1 1 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0031-1820 J9 PARASITOLOGY JI Parasitology PD JUN PY 1994 VL 108 BP 519 EP 526 PN 5 PG 8 WC Parasitology SC Parasitology GA NR045 UT WOS:A1994NR04500005 PM 8052507 ER PT J AU OBRIEN, F AF OBRIEN, F TI A TEST OF RANDOMNESS FOR FINITE SPATIAL DISTRIBUTIONS SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article AB A statistical method is presented lor determining randomness of points spatially distributed in two-dimensional space. The procedure is based on a distance-to-particle (nearest neighbor) model derived from an elementary Poisson process. In a previous derivation of the method, an extension to the model was proposed and used without adequate empirical justification. Herein the test is derived in detail and its performance evaluated with Monte Carlo simulations. Results indicate that the model extension provides adequate representations when the null hypothesis is true. RP OBRIEN, F (reprint author), USN,DIV UNDERSEA WARFARE CTR,CODE 2211,B 1171-1,1176 HOWELL ST,NEWPORT,RI 02841, USA. NR 6 TC 7 Z9 7 U1 0 U2 0 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD JUN PY 1994 VL 78 IS 3 BP 707 EP 714 PN 1 PG 8 WC Psychology, Experimental SC Psychology GA NN837 UT WOS:A1994NN83700001 ER PT J AU OBRIEN, F AF OBRIEN, F TI PROBABILITY METHODS FOR DETECTING RANDOMNESS IN SMALL SAMPLE SPATIAL DISTRIBUTIONS SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article AB Several probability and statistical methods are discussed for detecting spatial randomness in two dimensions, One method is derived and proposed for its ease of application. Monte Carlo simulation results are presented in support of the theoretical assumptions of the proposed method. RP OBRIEN, F (reprint author), USN,DIV UNDERSEA WARFARE CTR,CODE 2211,B 1171-1,1176 HOWELL ST,NEWPORT,RI 02841, USA. NR 5 TC 5 Z9 5 U1 0 U2 1 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD JUN PY 1994 VL 78 IS 3 BP 715 EP 720 PN 1 PG 6 WC Psychology, Experimental SC Psychology GA NN837 UT WOS:A1994NN83700002 ER PT J AU MERRILL, LL LEWANDOWSKI, LJ KOBUS, DA AF MERRILL, LL LEWANDOWSKI, LJ KOBUS, DA TI SELECTIVE ATTENTION SKILLS OF EXPERIENCED SONAR OPERATORS SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article; Proceedings Paper CT American-Psychological-Association Annual Convention CY AUG, 1990 CL BOSTON, MA SP AMER PSYCHOL ASSOC ID STROOP AB This study investigated the influence of sonar training and experience on the selective attention of experienced and inexperienced operators. The Stroop task was selected as a measure of general selective attention, similar in certain task requirements (attentional allocation) to sonar operation. Across two samples (ns = 32 and 36) and four repeated test sessions groups did not differ significantly in speed or accuracy of Stroop performance. The data suggest that experienced operators do not seem to have developed extraordinary attentional skills and that any attentional skills developed through sonar experience do not generalize to other tasks such as the Stroop. C1 SYRACUSE UNIV,SYRACUSE,NY 13244. RP MERRILL, LL (reprint author), USN,HLTH RES CTR,POB 85122,SAN DIEGO,CA 92186, USA. NR 18 TC 0 Z9 0 U1 1 U2 1 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD JUN PY 1994 VL 78 IS 3 BP 803 EP 812 PN 1 PG 10 WC Psychology, Experimental SC Psychology GA NN837 UT WOS:A1994NN83700019 PM 8084694 ER PT J AU MINTMIRE, JW ROBERTSON, DH WHITE, CT AF MINTMIRE, JW ROBERTSON, DH WHITE, CT TI MOLECULAR-DYNAMICS SIMULATIONS OF VOID COLLAPSE IN SHOCKED MODEL-MOLECULAR SOLIDS SO PHYSICAL REVIEW B LA English DT Article ID HOT-SPOT FORMATION; INITIATION; WAVES AB We have carried out a series of molecular-dynamics simulations on a model three-dimensional molecular solid to study the dynamics of shock-induced collapse of void defects. Molecular-dynamics methods were used for a model system of identical particles arranged as diatomic molecules aligned with the center of mass of each molecule at fcc lattice sites, using a {111} layering for the two-dimensional boundary conditions. The diatoms were internally coupled via a harmonic potential; all other interactions were modeled with Morse potentials between all particles other than the immediate diatomic partner. Using this model, we have investigated the effect of a cylindrical void at right angles to the direction of layering (and impact). Depending on the strength of the incident shock wave, the void is found to collapse either smoothly and symmetrically (like a balloon gradually losing air), or asymmetrically and turbulently. In the latter case, we note the transient formation (for periods of several hundreds of femtoseconds) of ''hot spots'' at the void location both in terms of the local effective temperature and the vibrational energies of the diatoms. RP MINTMIRE, JW (reprint author), USN,RES LAB,CODE 6179,WASHINGTON,DC 20375, USA. OI Mintmire, John/0000-0002-6551-0349 NR 26 TC 42 Z9 45 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 JUN 1 PY 1994 VL 49 IS 21 BP 14859 EP 14864 DI 10.1103/PhysRevB.49.14859 PG 6 WC Physics, Condensed Matter SC Physics GA NR425 UT WOS:A1994NR42500006 ER PT J AU BLACKSTEAD, HA PULLING, DB HORWITZ, JS CHRISEY, DB AF BLACKSTEAD, HA PULLING, DB HORWITZ, JS CHRISEY, DB TI OBSERVATION OF FLUX-FLOW IN SUPERCONDUCTING YBA2CU3O7-DELTA FILMS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; ANGULAR-DEPENDENT TRANSPORT; CRITICAL CURRENT-DENSITY; PHASE-SLIP RESISTIVITY; STATIC MAGNETIC-FIELD; MIXED-STATE; SINGLE-CRYSTALS; ANISOTROPIC RESISTIVITY; II SUPERCONDUCTORS; THIN-FILMS AB Measurements of field-induced changes of the a-b plane surface resistance of high-quality ( > 10(10) A/m2 at 77 K and B = 0) YBa2Cu3O7-delta films at 12.92 GHz reveal flux-flow resistivity at temperatures several degrees below the superconducting onset temperature. Flux-flow resistivity is identified by its temperature dependence and dependence on the Lorentz force. The results are compared to the surface resistance theory of Coffey and Clem, which includes a model for pinning. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BLACKSTEAD, HA (reprint author), UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556, USA. NR 29 TC 8 Z9 8 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 JUN 1 PY 1994 VL 49 IS 21 BP 15335 EP 15340 DI 10.1103/PhysRevB.49.15335 PG 6 WC Physics, Condensed Matter SC Physics GA NR425 UT WOS:A1994NR42500067 ER PT J AU BULSARA, AR LOWEN, SB REES, CD AF BULSARA, AR LOWEN, SB REES, CD TI COOPERATIVE BEHAVIOR IN THE PERIODICALLY MODULATED WIENER PROCESS - NOISE-INDUCED COMPLEXITY IN A MODEL NEUTRON SO PHYSICAL REVIEW E LA English DT Article ID STOCHASTIC RESONANCE; BISTABLE SYSTEM; CLIMATIC TRANSITIONS; SINGLE NEURON; RING LASER; 1/F NOISE; DYNAMICS; ESCAPE; INFORMATION; RESPONSES AB We consider a periodically modulated random walk (Wiener process) to an absorbing barrier with a deterministic reset to the starting point following each barrier crossing. Cooperative effects arising from the interplay between the noise and periodic modulation are analyzed as they manifest themselves in two statistical measures of the response: the passage time statistics of the process and the power spectral density of the output. Simple relationships exist between the extrema that occur in these two characterizations. The spectral properties of the response are seen to bear a striking resemblance to the stochastic resonance phenomenon that is known to occur in periodically driven noisy nonlinear systems. C1 COLUMBIA UNIV, DEPT ELECT ENGN, NEW YORK, NY 10027 USA. RP USN COMMAND, CTR CONTROL & OCEAN SURVEILLANCE, DIV RES DEV TESTING & EVALUAT, CODE 573, SAN DIEGO, CA 92152 USA. NR 96 TC 103 Z9 104 U1 0 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 JUN PY 1994 VL 49 IS 6 BP 4989 EP 5000 DI 10.1103/PhysRevE.49.4989 PN A PG 12 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW029 UT WOS:A1994NW02900035 ER PT J AU MANDELBAUM, P BEHAR, E SEELY, JF FELDMAN, U BROWN, CM HAMMEL, BA BACK, CA LEE, RW KANIA, DR BARSHALOM, A AF MANDELBAUM, P BEHAR, E SEELY, JF FELDMAN, U BROWN, CM HAMMEL, BA BACK, CA LEE, RW KANIA, DR BARSHALOM, A TI SPACE-RESOLVED DENSITY DIAGNOSTIC OF A HIGHLY IONIZED HOLMIUM (Z=67) LASER-PRODUCED PLASMA FROM 3D(10)4L-3D(10)4L'CUI-LIKE LINES SO PHYSICAL REVIEW E LA English DT Article ID CU-I; SPECTRA; ATOMS AB A space-resolved electron density diagnostic of a holmium laser-produced plasma has been performed using the intensity ratios of Cu I-like 3d(10)4l-3d(10)4l' lines. The atomic theoretical model of the Cu I-like ion included the 3d10nl levels with n = 4,5 and l = s,p,d,f. The effect of line absorption at high electron densities is discussed and the atomic data obtained with the HULLAC computer code are compared with previously published data. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. RP MANDELBAUM, P (reprint author), HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. NR 9 TC 1 Z9 1 U1 1 U2 4 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 JUN PY 1994 VL 49 IS 6 BP 5652 EP 5655 DI 10.1103/PhysRevE.49.5652 PN B PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NW030 UT WOS:A1994NW03000013 ER PT J AU LUGT, HJ COPELAND, GS AF LUGT, HJ COPELAND, GS TI ON PRESSURE MINIMA IN 2-DIMENSIONAL VORTEX FLOWS SO PHYSICS OF FLUIDS LA English DT Note AB For the present, a vortex will be defined as a two-dimensional region containing nested closed streamlines. Such a vortex need not contain an extremal point of vorticity nor a minimal point of pressure. In the Stokes-flow limit, a pressure minimum is not possible. A local criterion for the existence of a pressure minimum within a vortex is derived, leading to a transition Reynolds number above which the vortex contains a pressure minimum. In the limit of infinite Reynolds number, a pressure minimum must exist within the vortex. Specific data for a cavity flow and the flow past a circular cylinder are presented. RP LUGT, HJ (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,BETHESDA,MD 20084, USA. NR 11 TC 0 Z9 0 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 JUN PY 1994 VL 6 IS 6 BP 2230 EP 2232 DI 10.1063/1.868172 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NQ069 UT WOS:A1994NQ06900030 ER PT J AU SEELY, JF BROWN, CM HOLLAND, GE LEE, RW MORENO, JC MACGOWAN, BJ BACK, CA DASILVA, LB WAN, AS AF SEELY, JF BROWN, CM HOLLAND, GE LEE, RW MORENO, JC MACGOWAN, BJ BACK, CA DASILVA, LB WAN, AS TI IMAGING OF LASER-IRRADIATED TARGETS AT A WAVELENGTH OF 33.8-ANGSTROM USING A NORMAL-INCIDENCE MULTILAYER MIRROR SO PHYSICS OF PLASMAS LA English DT Article ID PLASMAS; REGION AB The morphology of the 33.8 angstrom emission from laser-irradiated targets was studied using a concave mirror with a W/B4C multilayer coating. The mirror had peak normal-incidence reflectance of 1.8% at a wavelength of 33.8 angstrom. The emissions from a variety of targets were imaged on film with a spatial resolution of 30 mum in the target plane. Radiatively heated, low-density plastic and silica foams, x-ray laser targets, and a gas-filled enclosure were imaged. Several targets were simultaneously imaged at wavelengths of 33.8 and 130 angstrom using two normal-incidence microscopes. C1 SFA INC,LANDOVER,MD 20785. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SEELY, JF (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 10 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD JUN PY 1994 VL 1 IS 6 BP 1997 EP 2002 DI 10.1063/1.870655 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600029 ER PT J AU UHM, HS AF UHM, HS TI A SELF-CONSISTENT NONLINEAR-THEORY OF RESISTIVE-WALL INSTABILITY IN A RELATIVISTIC ELECTRON-BEAM SO PHYSICS OF PLASMAS LA English DT Article ID KLYSTRON AMPLIFIERS; CURRENT MODULATION; GENERATION; POWER AB A self-consistent nonlinear theory of resistive-wall instability is developed for a relativistic electron beam propagating through a grounded cylindrical resistive tube. The theory is based on the assumption that the frequency of the resistive-wall instability is lower than the cutoff frequency of the waveguide. The theory is concentrated on study of the beam current modulation directly related to the resistive-wall klystron, in which a relativistic electron beam is modulated at the first cavity and propagates downstream through the resistive wall. Because of the self-excitation of the space charge waves by the resistive-wall instability, a highly nonlinear current modulation of the electron beam is accomplished as the beam propagates downstream. A partial integrodifferential equation is obtained in terms of the initial energy modulation (epsilon), the self-field effects (h), and the resistive-wall effects (kappa). Analytically investigating the partial integrodifferential equation, a scaling law of the propagation distance z(m) at which the maximum current modulation occurs is obtained. It is found in general that the self-field effects dominate over the resistive-wall effects at the beginning of the propagation. As the beam propagates farther downstream, the resistive-wall effects dominate. Because of a relatively large growth rate of the instability, the required tube length of the klystron is short for most applications. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 19 TC 4 Z9 4 U1 0 U2 0 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 JUN PY 1994 VL 1 IS 6 BP 2038 EP 2052 DI 10.1063/1.870658 PG 15 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600033 ER PT J AU CHOI, JJ GANGULY, AK ARMSTRONG, CM AF CHOI, JJ GANGULY, AK ARMSTRONG, CM TI FREQUENCY MULTIPLIED HARMONIC GYROTRON-TRAVELING-WAVE-TUBE AMPLIFIER SO PHYSICS OF PLASMAS LA English DT Article ID WIDEBAND AB Numerical simulations of a W-band two-stage tapered, frequency multiplied gyrotron-traveling-wave-tube amplifier are reported. Unlike conventional harmonic gyrodevices, a drive signal at the fundamental harmonic frequency is injected in the first stage for beam modulation, and amplified output radiation is extracted from the third harmonic cyclotron resonance interaction. Numerical results show that broadband millimeter wave radiation is obtained with an efficiency of 10%-15%, a gain of approximately 30 dB, and an instantaneous bandwidth of approximately 10% at a center frequency of 95 GHz for DELTAupsilon(z)/upsilon(z) = 2%. C1 OMEGA P INC,NEW HAVEN,CT 06520. SAIC,MCLEAN,VA 22102. RP CHOI, JJ (reprint author), USN,RES LAB,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375, USA. NR 11 TC 5 Z9 7 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 JUN PY 1994 VL 1 IS 6 BP 2058 EP 2062 DI 10.1063/1.870600 PG 5 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600035 ER PT J AU LAU, YY LIU, YF PARKER, RK AF LAU, YY LIU, YF PARKER, RK TI ELECTRON-EMISSION - FROM THE FOWLER-NORDHEIM RELATION TO THE CHILD-LANGMUIR LAW SO PHYSICS OF PLASMAS LA English DT Article ID FIELD-EMITTER ARRAYS; VACUUM MICROELECTRONICS AB Universal voltage-current characteristics are presented for a planar diode, showing the general transition from the Fowler-Nordheim relation to the Child-Langmuir law. These curves are normalized to the intrinsic scales that are constructed from the Fowler-Nordheim coefficients A, B. They provide an immediate assessment of the importance of the space charge effects, once the gap voltage, gap spacing, and the Fowler-Nordheim coefficients are specified. An example in the parameter regime of vacuum microelectronics is presented. C1 UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109. USN,RES LAB,DIV ELECTR SCI & TECHNOL,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375. RP LAU, YY (reprint author), UNIV MICHIGAN,INTENSE ENERGY BEAM INTERACT LAB,ANN ARBOR,MI 48109, USA. NR 31 TC 46 Z9 47 U1 1 U2 5 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 JUN PY 1994 VL 1 IS 6 BP 2082 EP 2085 DI 10.1063/1.870603 PG 4 WC Physics, Fluids & Plasmas SC Physics GA NP356 UT WOS:A1994NP35600038 ER PT J AU ALLEY, RE AF ALLEY, RE TI HISTORICAL-PERSPECTIVE ON NEW PHDS LOW PAY SO PHYSICS TODAY LA English DT Letter RP ALLEY, RE (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 0 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD JUN PY 1994 VL 47 IS 6 BP 102 EP & DI 10.1063/1.2808548 PG 0 WC Physics, Multidisciplinary SC Physics GA NQ893 UT WOS:A1994NQ89300027 ER PT J AU MERA, AE KELLER, TM AF MERA, AE KELLER, TM TI CURE STUDIES AND THERMAL-STABILITY OF AN ACETYLENE-FUNCTIONALIZED POLYPHENYLENE RESIN SO POLYMER BULLETIN LA English DT Article ID POLYMERS AB Samples of an acetylene-functionalized polyphenylene resin have been thermally cured to determine the effects on char yield and thermooxidative stability. The material's lack of a processing window led to difficulties in handling; it was found that quickly heating small samples above the melting point resulted in complete polymer melting prior to resolidification due to cure. Curing in air and in an inert atmosphere led to decreases and increases in char yields, respectively, at 900-degrees-C. Char yields in excess of 90 weight % were obtained at 900-degrees-C. The thermooxidative stability of the cured polymer was slightly better than that of the uncured resin, with the biggest improvement being in the 200-400-degrees-C range. RP MERA, AE (reprint author), USN,RES LAB,MAT CHEM BRANCH,CODE 6120,WASHINGTON,DC 20375, USA. NR 9 TC 1 Z9 1 U1 1 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-0839 J9 POLYM BULL JI Polym. Bull. PD JUN PY 1994 VL 33 IS 1 BP 103 EP 107 DI 10.1007/BF00313480 PG 5 WC Polymer Science SC Polymer Science GA PL079 UT WOS:A1994PL07900015 ER PT J AU BRADY, RF CHARLESWORTH, JM AF BRADY, RF CHARLESWORTH, JM TI FLUORESCENCE CURE STUDIES OF AMINO EPOXY SYSTEMS SO PROGRESS IN ORGANIC COATINGS LA English DT Article; Proceedings Paper CT 19th International Conference on Organic Coatings Science and Technology CY JUL 12-16, 1993 CL ATHENS, GREECE DE ACTIVATION ENERGY; CAMPHORQUINONE; FLUORESCENCE SPECTROPHOTOMETRY; GLASS TRANSITION TEMPERATURE; PHOSPHORESCENCE; THERMAL AND MECHANICAL PROPERTIES ID MOBILITY; POLYMERS; PROBE AB Luminescence techniques are used to study the reactivity and molecular dynamics of amino-epoxy polymers. The intrinsic fluorescence of an amidoamine is shown to be a convenient indicator of the progress of its reaction with the diglycidyl ether of bisphenol A. The fluorescence of the resulting polymer is used to measure its glass transition temperature (Tg) and the activation energies of some molecular motions in the polymer. For those polymers which have glass transition temperatures close to the temperature at which they are cured, useful information is obtained by observing changes in the phosphorescence of camphorquinone which has been added to the polymer matrix. C1 MAT RES LAB,ASCOT,VIC 3032,AUSTRALIA. RP BRADY, RF (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 8 TC 7 Z9 7 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0300-9440 J9 PROG ORG COAT JI Prog. Org. Coat. PD JUN-SEP PY 1994 VL 24 IS 1-4 BP 1 EP 9 DI 10.1016/0033-0655(94)85001-1 PG 9 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA PF107 UT WOS:A1994PF10700001 ER PT J AU MATTREY, RF TRAMBERT, MA BROWN, JJ YOUNG, SW BRUNETON, JN WESBEY, GE BALSARA, ZN AF MATTREY, RF TRAMBERT, MA BROWN, JJ YOUNG, SW BRUNETON, JN WESBEY, GE BALSARA, ZN TI PERFLUBRON AS AN ORAL CONTRAST AGENT FOR MR-IMAGING - RESULTS OF A PHASE-III CLINICAL-TRIAL SO RADIOLOGY LA English DT Article DE COLON; INTESTINES; LIVER; MAGNETIC RESONANCE (MR); CONTRAST ENHANCEMENT; PANCREAS; STOMACH ID MAGNETIC PARTICLES; SPIN-ECHO; OPTIMIZATION; EFFICACY; ABDOMEN; HUMANS; LIVER; RATS; AIR AB PURPOSE: To assess perflubron for magnetic resonance (MR) imaging in the abdomen and pelvis in 9 multicenter trial. MATERIALS AND METHODS: MR images were obtained in 127 subjects before and after ingestion of perflubron with T1-, proton-density-, and T2-weighted sequences at 0.38, 1.0,or 1.5 T. Postcontrast images were compared with baseline iinages, and percentage of additional bowel darkened distinction of bowel from adjacent tissue, and change in image artifact were graded. RESULTS: Perflubron increased the bowel darkening in over 92% of subjects with all sequences and held strengths. It improved definition of the left lobe of the liver and body and tail of the pancreas in 67%, 29%, and 42% of subjects, respectively, and of the uterus and bladder in 80% and 76%. Abnormal tissue was more conspicuous in 69% of subjects. Highest scores were achieved when the upper abdomen was imaged 5-30 minutes and the pelvis 10-40 minutes after ingestion. No image artifacts or side effects were attributed to perflubron. CONCLUSION: Perflubron is safe, and its efficacy was unaffected by pulse sequences, magnetic field strength, or time delay. C1 UNIV CALIF SAN DIEGO,DEPT RADIOL,SAN DIEGO,CA. EDWARD MALLINCKRODT INST RADIOL,ST LOUIS,MO. STANFORD UNIV,PALO ALTO,CA. CTR ANTOINE LACASSAGNE,NICE,FRANCE. SCRIPPS CLIN & HOSP,LA JOLLA,CA. USN,MED CTR,SAN DIEGO,CA. FU NCI NIH HHS [NCI K08-CA01319] NR 27 TC 40 Z9 40 U1 0 U2 3 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 SN 0033-8419 J9 RADIOLOGY JI Radiology PD JUN PY 1994 VL 191 IS 3 BP 841 EP 848 PG 8 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA NM668 UT WOS:A1994NM66800046 PM 8184076 ER PT J AU SEMB, GB ELLIS, JA AF SEMB, GB ELLIS, JA TI KNOWLEDGE TAUGHT IN SCHOOL - WHAT IS REMEMBERED SO REVIEW OF EDUCATIONAL RESEARCH LA English DT Review ID LONG-TERM-MEMORY; RETENTION; MAINTENANCE; ACHIEVEMENT; PSYCHOLOGY; PROSE AB Popular belief holds that much of what is taught in classrooms is forgotten shortly thereafter. However, there is evidence from numerous studies that long-term retention for knowledge taught in school is substantial. These studies are reviewed, and several variables that affect the ability to remember are discussed. The article concludes that (a) students retain much of the knowledge taught in the classroom; (b) retention decreases over time as a function of the length of the retention interval but the forgetting curves for knowledge taught in school do not decline as rapidly or asymptote as low as the curves observed in traditional laboratory studies; (c) increasing the level of original learning differentially affects retention performance; (d) both instructional content and assessment tasks affect learning and retention, with one of the most consistent effects being that recognition tasks are retained at higher levels than recall tasks; (e) most instructional strategies that promote higher levels of original learning do not result in differentially better retention (however, several exceptions are discussed); and (f) while higher ability students learn and remember more than lower ability students, there is no evidence for differential forgetting. Implications for research and teaching are discussed. C1 USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92152. RP SEMB, GB (reprint author), UNIV KANSAS,DEPT HUMAN DEV,LAWRENCE,KS 66045, USA. NR 125 TC 57 Z9 58 U1 0 U2 11 PU AMER EDUCATIONAL RESEARCH ASSOC PI WASHINGTON PA 1230 17TH ST NW, WASHINGTON, DC 20036-3078 SN 0034-6543 J9 REV EDUC RES JI Rev. Educ. Res. PD SUM PY 1994 VL 64 IS 2 BP 253 EP 286 DI 10.3102/00346543064002253 PG 34 WC Education & Educational Research SC Education & Educational Research GA NR979 UT WOS:A1994NR97900003 ER PT J AU PRUNER, L AF PRUNER, L TI THE ZERO-HOUR - GLASNOST AND SOVIET CINEMA IN TRANSITION - HORTON,A, BRASHINSKY,M SO SLAVIC AND EAST EUROPEAN JOURNAL LA English DT Book Review RP PRUNER, L (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN TEACHERS SLAVIC EAST EUROPEAN LANGUAGES PI TUCSON PA UNIV ARIZONA MODERN LANGUAGES BUILDING, TUCSON, AZ 85287 SN 0037-6752 J9 SLAVIC E EUR J JI Slavic East Eur. J. PD SUM PY 1994 VL 38 IS 2 BP 389 EP 390 DI 10.2307/308835 PG 2 WC Literature, Slavic SC Literature GA NV648 UT WOS:A1994NV64800035 ER PT J AU TRITTEN, JJ AF TRITTEN, JJ TI EUROPE AND NAVAL ARMS-CONTROL IN THE GORBACHEV ERA - FURST,A, HEISE,V, MILLER,SE SO SLAVIC REVIEW LA English DT Book Review RP TRITTEN, JJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, 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 SUM PY 1994 VL 53 IS 2 BP 645 EP 646 DI 10.2307/2501386 PG 2 WC Area Studies; Humanities, Multidisciplinary SC Area Studies; Arts & Humanities - Other Topics GA PE762 UT WOS:A1994PE76200103 ER PT J AU GALDORISI, GV AF GALDORISI, GV TI UNITED-STATES MILITARY SO SLOAN MANAGEMENT REVIEW LA English DT Letter RP GALDORISI, GV (reprint author), USN,CORONADO,CA, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MASS INST TECHNOL PI CAMBRIDGE PA SLOAN SCH MANAGE, 50 MEMORIAL DR, CAMBRIDGE, MA 02139 SN 0019-848X J9 SLOAN MANAGE REV JI Sloan Manage. Rev. PD SUM PY 1994 VL 35 IS 4 BP 8 EP 9 PG 2 WC Business; Management SC Business & Economics GA NY166 UT WOS:A1994NY16600014 ER PT J AU FIALA, AD DUNHAM, DW SOFIA, S AF FIALA, AD DUNHAM, DW SOFIA, S TI VARIATION OF THE SOLAR DIAMETER FROM SOLAR ECLIPSE OBSERVATIONS, 1715-1991 SO SOLAR PHYSICS LA English DT Article; Proceedings Paper CT IAU Colloquium NO 143 on the Sun as a Variable Star: Solar and Stellar Irradiance Variations CY JUN 20-25, 1993 CL BOULDER, CO SP INT ASTRON UNION AB The diameter of the Sun may be measured at the time of a solar eclipse. We have performed an exhaustive search of the astronomical literature to find all existing observations of solar eclipses suitable for this purpose. We have also taken new observations by new techniques. We have undertaken a project to reduce them systematically, and in an automated, self-consistent way. This will produce determinations of the solar radius at the times of solar eclipses from 1715 to the present, Re-reduction, using newer ephemerides, of observations made in 1984 shows that the component of the residuals caused by the ephemeris is substantially reduced. This paper summarizes the research plan, outlines the detailed astronomical features included in the calculations, and presents the results available. C1 INT OCCULTAT TIMING ASSOC,LAUREL,MD 20723. YALE UNIV,NEW HAVEN,CT 06520. JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. RP FIALA, AD (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 14 TC 27 Z9 27 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 JUN PY 1994 VL 152 IS 1 BP 97 EP 104 DI 10.1007/BF01473190 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NY582 UT WOS:A1994NY58200017 ER PT J AU PECKERAR, MC MALDONADO, JR AF PECKERAR, MC MALDONADO, JR TI THE ADVANCED LITHOGRAPHY PROGRAM - GOVERNMENTS ROLE IN X-RAY-DEVELOPMENT SO SOLID STATE TECHNOLOGY LA English DT Article C1 IBM CORP,DIV RES,ADV LITHOG FACIL,FISHKILL,NY. RP PECKERAR, MC (reprint author), USN,RES LAB,SURFACE & INTERFACE SCI BRANCH,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PENNWELL PUBL CO SOLID STATE TECHNOLOGY OFFICE PI NASHUA PA TEN TARA BLVD 5TH FLOOR, NASHUA, NH 03062-2801 SN 0038-111X J9 SOLID STATE TECHNOL JI Solid State Technol. PD JUN PY 1994 VL 37 IS 6 BP 44 EP & PG 0 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA NR186 UT WOS:A1994NR18600007 ER PT J AU KODRES, CA AF KODRES, CA TI FLOW PARAMETER APPROACH TO MODELING THE FLOW OF HEATED GASES THROUGH HIGH-RESISTANCE POROUS-MEDIA SO TRANSPORT IN POROUS MEDIA LA English DT Article DE HIGH RESISTANCE MEDIUM; CONCRETE; HEATED FLOWS; FLOW PARAMETER AB A constitutive relationship is developed to characterize the flow of high velocity, compressible, heated gases through concrete. This relationship equates a nondimensional flow parameter with pressure and temperature ratios across the medium. The key premise is that the resistance to flow through a porous medium can be modeled with friction coefficients analogous to the method used for simpler geometries. The utility of a porous media compressible flow parameter is appraised by comparing it with the Forchheimer equation modified for an ideal gas. There is little difference in adiabatic flow rates predicted by the two relationships. The Forchheimer equation does not account for the effects of heating. The flow parameter predicts mass flows through a slab of concrete to decrease by nearly 50% when this medium is heated from 25 to 350oC. RP KODRES, CA (reprint author), USN, CIVIL ENGN LAB, PORT HUENEME, CA 93043 USA. NR 20 TC 6 Z9 6 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0169-3913 J9 TRANSPORT POROUS MED JI Transp. Porous Media PD JUN PY 1994 VL 15 IS 3 BP 229 EP 249 DI 10.1007/BF00613280 PG 21 WC Engineering, Chemical SC Engineering GA PQ750 UT WOS:A1994PQ75000003 ER PT J AU SEALE, JL THORP, JW CONWAY, JM RUMPLER, WV HABERMAN, KJ AF SEALE, JL THORP, JW CONWAY, JM RUMPLER, WV HABERMAN, KJ TI ENERGY-EXPENDITURE AND FLUID PRODUCTION IN HYPERBARIC HE-O2 ENVIRONMENTS USING DOUBLY LABELED WATER SO UNDERSEA & HYPERBARIC MEDICINE LA English DT Note DE HEAT PRODUCTION; DOUBLY LABELED WATER; CARBON DIOXIDE PRODUCTION; WATER TURNOVER; URINE PRODUCTION; DRY SATURATION DIVE ID CALORIMETRY AB Energy expenditure (EE), carbon dioxide production (rCO2), water turnover (rH2O), and urine production (UP) were measured to determine nutrient requirements of U.S. Navy divers during saturation dives. Parameters were measured in a normal surface environment (n = 10) and in 0.56 MPa (n = 9) and 3.17 MPa (n = 11) helium-oxygen environments. Daily EE, rCO2, and rH2O were measured with the doubly labeled water method for 10-14 days in each environment. Daily UP was determined by 24-h urine collection for 5- to 10-day periods in each environment. Divers consumed a mixed diet composed of 30% calories from fat, 15% protein, and 55% carbohydrate. Both EE and rCO2 increased significantly relative to surface conditions at 0.56 MPa (13 +/- 4% and 11 +/- 4%) and 3.17 MPa (14 +/- 4% and 11 +/- 3%), but there was no difference between dives. Water turnover was not significantly affected by the hyperbaric environment. UP was significantly greater than surface conditions at 0.56 MPa (53 +/- 19%) but not at 3.17 MPa (38 +/- 18%). Increased EE is attributed to thermal stress caused by the helium-oxygen environment. Increased UP may have been caused by decreased evaporative water loss. C1 USN,MED RES INST,DIVING MED LAB,BETHESDA,MD 20889. RP SEALE, JL (reprint author), USDA ARS,BELTSVILLE AGR RES CTR,BELTSVILLE HUMAN NUTR RES CTR,ENERGY & PROT NUTR LAB,BELTSVILLE,MD 20705, USA. NR 20 TC 3 Z9 6 U1 0 U2 1 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 1066-2936 J9 UNDERSEA HYPERBAR M JI Undersea Hyperb. Med. PD JUN PY 1994 VL 21 IS 2 BP 199 EP 208 PG 10 WC Marine & Freshwater Biology; Medicine, Research & Experimental SC Marine & Freshwater Biology; Research & Experimental Medicine GA NT011 UT WOS:A1994NT01100010 PM 7914783 ER PT J AU NARAYAN, P FOURNIER, G INDUDHARA, R LEIDICH, R SHINOHARA, K INGERMAN, A AF NARAYAN, P FOURNIER, G INDUDHARA, R LEIDICH, R SHINOHARA, K INGERMAN, A TI TRANSURETHRAL EVAPORATION OF PROSTATE (TUEP) WITH ND-YAG LASER USING A CONTACT FREE BEAM TECHNIQUE - RESULTS IN 61 PATIENTS WITH BENIGN PROSTATIC HYPERPLASIA SO UROLOGY LA English DT Article ID TRANS-URETHRAL PROSTATECTOMY; MANAGEMENT AB Objective. This prospective study was undertaken to evaluate the safety and efficacy of neodymium:yttrium-aluminium-garnet (Nd:YAG) laser for treatment of symptomatic benign prostatic hyperplasia (BPH). Methods. A total of 61 patients at a mean age of 71.6 years with symptomatic bladder outlet obstruction due to BPH underwent transurethral evaporation of prostate (TUEP) using Nd:YAG laser. Twelve of the patients were experiencing acute retention. Pre- and postoperative evaluation consisted of American Urological Association (AUA) symptom questionnaire and a sexual function questionnaire, uroflowmetry, postvoid residual urine, electrolytes, blood urea nitrogen, creatinine, hematocrit, and prostate volume estimation by transrectal ultrasound. TUEP was achieved by employing a side-firing Nd:YAG laser fiber with a durable quartz reflector and high-power density (Ultraline, Heraeus LaserSonics, Milpitas, CA) that was used in a contact mode. Results. All patients have been evaluated for three months, 26 for six months, and 7 for twelve months. Mean prostatic size was 41.1 g. The mean improvement in symptom scores at one, three, six, and twelve months was 69.8 percent, 70.9 percent, 76.0 percent, and 70.9 percent, respectively (P = < 0.0001). The mean increase in maximum uroflow at one, three, six, and twelve months was 63.4 percent, 66.7 percent, 41.94 percent, and 164.52 percent, respectively (P = < 0.0001). There was no instance of significant fluid absorption or bleeding. The duration of postoperative catheterization was two days in 43 patients, three to seven days in 16 patients, and two to three weeks in 2 patients. There were no deaths. All patients evaluated by TRUS at six months had open channeling defects. Videocystoscopy performed in 1 6 patients at two to three months postoperatively revealed tissue slough. At repeat cystoscopy in these patients at six months, the prostatic fossa was completely healed with no evidence of tissue slough. Conclusions. It is concluded that the technique of TUEP using Nd:YAG laser is safe and, in preliminary results, appears apparently effective in the management of BPH. C1 DEPT VET AFFAIRS MED CTR,DIV UROL,SAN FRANCISCO,CA. USN HOSP,DEPT UROL,OAKLAND,CA. RP NARAYAN, P (reprint author), UNIV CALIF SAN FRANCISCO,DEPT UROL,BOX U575,3RD & PARNASSUS,SAN FRANCISCO,CA 94143, USA. NR 15 TC 61 Z9 61 U1 0 U2 0 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD JUN PY 1994 VL 43 IS 6 BP 813 EP 820 DI 10.1016/0090-4295(94)90142-2 PG 8 WC Urology & Nephrology SC Urology & Nephrology GA NQ085 UT WOS:A1994NQ08500014 PM 7515205 ER PT J AU LEE, TF CLARK, JR SWADLEY, SD AF LEE, TF CLARK, JR SWADLEY, SD TI POTENTIAL APPLICATIONS OF THE SSM/I CLOUD LIQUID WATER PARAMETER TO THE ESTIMATION OF MARINE AIRCRAFT ICING SO WEATHER AND FORECASTING LA English DT Article AB Images of integrated cloud liquid water derived from the Special Sensor Microwave Imager (SSM/I) aboard the Defense Meteorological Satellite Program polar-orbiting satellite are presented. Examples with infrared and visible images and synoptic charts are shown for the Gulf of Alaska and Bering Sea for March 1992. The SSM/I images often show detailed, low-level cloud circulations not suggested by infrared satellite images. A prototype system for forecasting the potential for aircraft icing, which combines the SSM/I cloud liquid water parameter with numerical model output, is also presented. Where integrated cloud liquid water exceeds a specific threshold, an icing watch region is specified. The top of the icing watch layer is set to the model -20 degrees C level or infrared cloud top, whichever is lower. The base of the icing watch layer is set to the 0 degrees C level from model output. No watch areas are specified where the infrared cloud top temperature is above freezing, regardless of integrated cloud liquid water amount. C1 COMP SCI CORP,MONTEREY,CA. RP LEE, TF (reprint author), USN,RES LAB,DIV MARINE METEOROL,MONTEREY,CA, USA. NR 0 TC 6 Z9 7 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD JUN PY 1994 VL 9 IS 2 BP 173 EP 182 DI 10.1175/1520-0434(1994)009<0173:PAOTSC>2.0.CO;2 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA QL524 UT WOS:A1994QL52400002 ER PT J AU BACMEISTER, JT NEWMAN, PA GARY, BL CHAN, KR AF BACMEISTER, JT NEWMAN, PA GARY, BL CHAN, KR TI AN ALGORITHM FOR FORECASTING MOUNTAIN WAVE-RELATED TURBULENCE IN THE STRATOSPHERE SO WEATHER AND FORECASTING LA English DT Article AB A global mountain wave parameterization for prediction of wave-related displacements and turbulence is described. The parameterization is used with input from National Meteorological Center analyses of wind and temperature to examine small-scale disturbances encountered by the National Aeronautics and Space Administration high-altitude ER-2 during the Second Airborne Arctic Stratosphere Experiment. The magnitude and location of observed large wave events are well reproduced. A strong correlation is suggested between patches of moderate turbulence encountered by the ER-2 and locations where breaking mountain waves are predicted by the parameterization. These facts suggest that useful forecasts of global mountain wave activity, including wave-related clear-air turbulence, can be made quickly and inexpensively using our mountain wave parameterization with input from current numerical forecast models. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NASA,JET PROP LAB,PASADENA,CA. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP BACMEISTER, JT (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7641,WASHINGTON,DC 20375, USA. RI Newman, Paul/D-6208-2012 OI Newman, Paul/0000-0003-1139-2508 NR 0 TC 48 Z9 48 U1 0 U2 3 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD JUN PY 1994 VL 9 IS 2 BP 241 EP 253 DI 10.1175/1520-0434(1994)009<0241:AAFFMW>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA QL524 UT WOS:A1994QL52400007 ER PT J AU BUOT, FA RAJAGOPAL, AK AF BUOT, FA RAJAGOPAL, AK TI HYSTERESIS OF TRAPPED CHARGE IN ALGASB BARRIER AS A MECHANISM FOR THE CURRENT BISTABILITY IN ALGASB INAS ALGASB DOUBLE-BARRIER STRUCTURES SO APPLIED PHYSICS LETTERS LA English DT Article AB A simple theory of charge buildup and bistability is used to show that the new hysteresis and bistability in the current-voltage behavior recently reported in AlGaSb/InAs/AlGaSb double-barrier structures is directly related to the bistability and hysteresis in the hole population of the AlGaSb barrier layer. This occurs well before the resonant-tunneling-current peak. RP BUOT, FA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 10 Z9 10 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 MAY 30 PY 1994 VL 64 IS 22 BP 2994 EP 2996 DI 10.1063/1.111382 PG 3 WC Physics, Applied SC Physics GA NN752 UT WOS:A1994NN75200028 ER PT J AU PLATT, N HAMMEL, SM HEAGY, JF AF PLATT, N HAMMEL, SM HEAGY, JF TI EFFECTS OF ADDITIVE NOISE ON ON-OFF INTERMITTENCY SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHAOS; TRANSITION; SYSTEMS AB On-off intermittency is an aperiodic switching between static, or laminar, behavior and bursts of oscillations. It has been recently investigated in a class of one-dimensional maps that are multiplicatively coupled to either random or chaotic signals. The addition of noise to the system results in a fundamental change in the nature of the intermittency. The critical onset parameter changes discontinuously, and the distribution of the laminar phases is modified. These contrasts are examined in terms of random walks. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PLATT, N (reprint author), USN,CTR SURFACE WARFARE,NONLINEAR DYNAM & WQAVELETS GRP,CODE B44,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 11 TC 134 Z9 134 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 MAY 30 PY 1994 VL 72 IS 22 BP 3498 EP 3501 DI 10.1103/PhysRevLett.72.3498 PG 4 WC Physics, Multidisciplinary SC Physics GA NN727 UT WOS:A1994NN72700016 ER PT J AU BINARI, SC DIETRICH, HB KELNER, G ROWLAND, LB DOVERSPIKE, K GASKILL, DK AF BINARI, SC DIETRICH, HB KELNER, G ROWLAND, LB DOVERSPIKE, K GASKILL, DK TI ELECTRICAL CHARACTERIZATION OF TI SCHOTTKY BARRIERS ON N-TYPE GAN SO ELECTRONICS LETTERS LA English DT Article DE SEMICONDUCTOR DEVICE CHARACTERIZATION; SCHOTTKY-BARRIER DIODES ID SINGLE-CRYSTAL GAN; SEMICONDUCTOR AB The Schottky barrier height of Ti on n-type GaN has been measured to be 0.58 and 0.59eV by capacitance-voltage and current-voltage techniques, respectively. This work is of particular interest because it is the first measure of the Schottky barrier height on GaN for a metal other than Au. The barrier height of Ti on GaN is significantly less than that of Au. This supports the prediction that the Fermi level is not pinned at the GaN surface. RP BINARI, SC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Rowland, Larry/C-4487-2008 NR 11 TC 98 Z9 101 U1 1 U2 9 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAY 26 PY 1994 VL 30 IS 11 BP 909 EP 911 DI 10.1049/el:19940565 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA NR796 UT WOS:A1994NR79600059 ER PT J AU MARQUARDT, CL COOPER, DG BUDNI, PA KNIGHTS, MG SCHEPLER, KL DEDOMENICO, R CATELLA, GC AF MARQUARDT, CL COOPER, DG BUDNI, PA KNIGHTS, MG SCHEPLER, KL DEDOMENICO, R CATELLA, GC TI THERMAL LENSING IN SILVER GALLIUM SELENIDE PARAMETRIC OSCILLATOR CRYSTALS SO APPLIED OPTICS LA English DT Article ID AGGASE2 AB We performed an experimental investigation of thermal lensing in silver gallium selenide (AgGaSe2) optical parametric oscillator crystals pumped by a 2-mum laser at ambient temperature. We determined an empirical expression for the effective thermal focusing power in terms of the pump power, beam diameter, crystal length, and absorption coefficient. This relation may be used to estimate average power limitations in designing AgGaSe2 optical parametric oscillators. We also demonstrated an 18% slope efficiency from a 2-mum pumped AgGaSe2 optical parametric oscillator operated at 77 K, at which temperature thermal lensing is substantially reduced because of an increase in the thermal conductivity and a decrease in the thermal index gradient dn/dT. Cryogenic cooling may provide an additional option for scaling up the average power capability of a 2-mum pumped AgGaSe2 optical parametric oscillator. C1 JAYCOR, VIENNA, VA 22180 USA. LOCKHEED SANDERS, MERRIMACK, NH 03054 USA. WRIGHT LAB, WRIGHT PATTERSON AFB, OH 45433 USA. CLEVELAND CRYSTALS INC, CLEVELAND, OH USA. RP MARQUARDT, CL (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. OI Schepler, Kenneth/0000-0001-9658-2305 NR 13 TC 26 Z9 27 U1 1 U2 7 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 20 PY 1994 VL 33 IS 15 BP 3192 EP 3197 PG 6 WC Optics SC Optics GA NM308 UT WOS:A1994NM30800007 PM 20885687 ER PT J AU SPADARO, D LETO, P ANTIOCHOS, SK AF SPADARO, D LETO, P ANTIOCHOS, SK TI OBSERVATIONAL TESTS FOR NONEQUILIBRIUM IONIZATION IN THE SOLAR CORONA SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIATIVE TRANSFER; SUN, CORONA; SUN, TRANSITION REGION; SUN, UV RADIATION ID EXTREME-ULTRAVIOLET-SPECTRUM; NON-EQUILIBRIUM IONIZATION; TRANSITION-REGION; LOOPS; FLOWS; LINES AB Nonequilibrium ionization may be produced by a variety of processes in the solar corona, for example, by mass flows through the large temperature gradients of the transition region or by impulsive heating and cooling. Any deviation from equilibrium ionization would have a strong effect on the radiation from the corona and on the interpretation of solar observations; hence, it is important to determine observational signatures of nonequilibrium. The temperature-sensitive line ratios can be used as such signatures. We examine the line ratios: C IV I(1548.2 angstrom)/I(312.4 angstrom), O IV I(789.4 angstrom)/I(554.4 angstrom), O V I(629.7 angstrom)/I(172.2 angstrom), O VI I(1031.9 angstrom)/I(173.0 angstrom) and O VI I(1031.9 angstrom)/I(150.1 angstrom). These line ratios are calculated for four coronal loop models that have a steady flow and that are known to have significant departures from equilibrium ionization. Our results indicate that, in general, nonequilibrium causes a considerable reduction in the line ratios, more than an order of magnitude in the downflowing leg of the loop model with the largest mass flows. We find that the C IV line ratio is the most sensitive to nonequilibrium. We discuss the implications of our results for observations, specifically, the observations expected from the upcoming SOHO mission. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP SPADARO, D (reprint author), OSSERV ASTROFIS CATANIA,V A DORIA 6,I-95125 CATANIA,ITALY. RI Antiochos, Spiro/D-4668-2012; OI Antiochos, Spiro/0000-0003-0176-4312; Leto, Paolo/0000-0003-4864-2806 NR 24 TC 9 Z9 9 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 MAY 20 PY 1994 VL 427 IS 1 BP 453 EP 458 DI 10.1086/174156 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NM046 UT WOS:A1994NM04600038 ER PT J AU BHATIA, AK KASTNER, SO KEENAN, FP CONLON, ES WIDING, KG AF BHATIA, AK KASTNER, SO KEENAN, FP CONLON, ES WIDING, KG TI THE FE-XIV SPECTRUM - PREDICTED LINE-INTENSITIES AND SOLAR IDENTIFICATIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; LINE, IDENTIFICATION; SUN, CORONA; SUN, GENERAL; SUN, UV RADIATION ID TRANSITION-PROBABILITIES; ISOELECTRONIC SEQUENCE; XUV OBSERVATIONS; CROSS-SECTIONS; CORONAL LINES; COMPACT FLARE; EUV SPECTRUM; NI-XVI; IONS; WAVELENGTHS AB Level populations and line intensities have been calculated in a 40-level model of Fe XIV which includes the configurations 3p3 and 3s3p3d. The results have been compared against intensities of weaker, unidentified, or tentatively classified lines in published solar line lists including a recent GSFC/SERTS high-resolution list, and in presently measured archival NRL/S082A active region spectra. Seven new lines are identified as Fe XIV transitions; five other observed, unidentified lines are considered to be Fe XIV transitions on the basis of wave-length coincidence, but require further observations to obtain photometric intensities for verification; one line at 216.93 angstrom is shown to be due to some other ion than Fe XIV. In addition, a unique forbidden infrared (congruent-to 1.25 mum) line originating in the high metastable level 3s3p3d(F-4(9/2)) is found to have an unusual intensity dependence on electron density. C1 MATH SCI CONSULTANTS INC,GREENBELT,MD 20770. QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP BHATIA, AK (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON BRANCH,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771, USA. NR 44 TC 13 Z9 13 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 MAY 20 PY 1994 VL 427 IS 1 BP 497 EP 510 DI 10.1086/174160 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NM046 UT WOS:A1994NM04600042 ER PT J AU OWRUTSKY, JC BARONAVSKI, AP AF OWRUTSKY, JC BARONAVSKI, AP TI LIFETIMES OF THE (B)OVER-TILDE STATE OF CH3I AND CD3I USING FEMTOSECOND RESONANCE-ENHANCED MULTIPHOTON IONIZATION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID METHYL-IODIDE; RYDBERG STATES; RAMAN-SCATTERING; DYNAMICS; PREDISSOCIATION; TRANSITION AB Lifetimes of the vibrationless levels of the B state of CH3I and CD3I have been measured using a tunable deep UV (almost-equal-to 200 nm) femtosecond source. The lifetimes of the predissociated states are 1.38 +/- 0.20 and 1.84 +/- 0.13 ps, respectively. These values are compared with those obtained by indirect measurements which are described in terms of the multidimensional character of the reaction coordinate. RP OWRUTSKY, JC (reprint author), USN,RES LAB,DIV CHEM,CODE 6111,WASHINGTON,DC 20375, USA. RI Owrutsky, Jeffrey/K-7649-2012 NR 12 TC 16 Z9 17 U1 0 U2 5 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 MAY 20 PY 1994 VL 222 IS 4 BP 335 EP 338 DI 10.1016/0009-2614(94)87070-5 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NM444 UT WOS:A1994NM44400005 ER PT J AU MORAN, LB YESINOWSKI, JP AF MORAN, LB YESINOWSKI, JP TI CHEMICAL-SHIFT-SELECTIVE MULTIPLE-QUANTUM NMR AS A PROBE OF THE CORRELATION LENGTH OF CHEMICAL SHIELDING TENSORS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; SOLID-STATE NMR; DYNAMICS; EXCITATION AB A method for obtaining multiple-quantum NMR spectra of a selected homogeneously broadened region of an inhomogeneously broadened powder pattern (CHESHIRE) is demonstrated with F-19 NMR results for polycrystalline calcium fluorapatite, CaF(PO4)3, and a 9/1 calcium/strontium fluorapatite solid solution. The slower growth rate of F-19 multiple-quantum coherences at the same selected chemical shift in the latter compound is interpreted in terms of a decrease in the average correlation length of the shielding tensor in the one-dimensional chain of fluoride ions in the solid-solution, due to the F-19 chemical-shift perturbation caused by the strontium ion substitutions. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MORAN, LB (reprint author), MICHIGAN STATE UNIV,DEPT CHEM,E LANSING,MI 48824, USA. NR 25 TC 11 Z9 11 U1 0 U2 2 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 MAY 20 PY 1994 VL 222 IS 4 BP 363 EP 370 DI 10.1016/0009-2614(94)87076-4 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NM444 UT WOS:A1994NM44400011 ER PT J AU Glendening, JW AF Glendening, John W. TI Dependence of boundary layer structure near an ice-edge coastal front upon geostrophic wind direction SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article AB The dependence of boundary layer (BL) features within a "coastal front" (created by temperature and roughness differences across a surface interface) upon the direction of a large-scale geostrophic wind is examined with idealized simulations, using parameters appropriate to an ice edge. Maximum vertical velocities and strongest horizontal gradients occur when the vertically averaged B L velocity near the ice edge parallels the ice edge; this occurs at the on-ice geostrophic angle for which frictional modification of the geostrophic wind optimally counters thermally induced cross-interface flow at the ice edge. This optimal angle is greater for "ice-on-right" (when looking downwind, assuming northern hemisphere rotation) flow than for "ice-on-left" flow due to asymmetry introduced by surface friction. The associated vertical velocity maxima also vary asymmetrically with geostrophic wind direction. The optimal angle depends upon the average surface roughness at the interface, whereas the vertical velocity maxima depend upon the differential surface roughness across the interface. For a prototype ice edge, the optimal on-ice angle is 20 degrees larger and its vertical velocity maximum 3 times larger for ice-on-right flow, with differential surface roughness accounting for nearly half of the magnitude asymmetry. Along-ice velocity jets develop only when the large-scale geostrophic wind nearly parallels the ice edge. The curl of the surface stress is sensitive to changes in geostrophic wind direction, changing sign over the water when the large-scale geostrophic wind approximately parallels the ice edge. Because of frontal collapse the width of the surface transition region has a relatively minor influence on these results. C1 USN, Res Lab, Marine Meteorol Div, Monterey, CA 93943 USA. RP Glendening, JW (reprint author), USN, Res Lab, Marine Meteorol Div, Code 7541, Monterey, CA 93943 USA. EM glendeni@navo.navy.mil FU Office of Naval Research Program Element [6.1-1153N]; Ken Davidson, Department of Meteorology, Naval Postgraduate School FX The support of the sponsor, Office of Naval Research Program Element 6.1-1153N, and of Ken Davidson, Department of Meteorology, Naval Postgraduate School, is gratefully acknowledged. I also thank Peter Guest, Department of Meteorology, Naval Postgraduate School, for his helpful explanations of ice-edge observations. NR 20 TC 9 Z9 9 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAY 20 PY 1994 VL 99 IS D3 BP 5569 EP 5581 DI 10.1029/93JD02925 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA V04QH UT WOS:000207072400022 ER PT J AU WEAVER, BD JACKSON, EM SUMMERS, GP BURKE, EA AF WEAVER, BD JACKSON, EM SUMMERS, GP BURKE, EA TI EFFECT OF PARTICLE IRRADIATION ON BA0.6K0.4BIO3 THIN-FILMS SO PHYSICA C LA English DT Article ID INDUCED DISPLACEMENT DAMAGE; SUPERCONDUCTING BA1-XKXBIO3; CUPRATE SUPERCONDUCTORS; TRANSITION-TEMPERATURE; NEUTRON-IRRADIATION; YBA2CU3O7-DELTA; ELECTRON; DENSITY; SILICON; FLUENCE AB Radiation-induced changes in the superconducting transition temperature T(c) and the zero-field critical current density at 4.2 K are reported for Ba0.6K0.4BiO3 (BKBO) thin films irradiated with 1, 2, and 3 MeV protons and 4 and 6 MeV helium ions. Displacement damage decreases T(c) at the same rate for BKBO as for the high-T(c) cuprates. The critical current density decreases approximately exponentially with increasing fluence at a rate that is directly proportional to the nonionizing energy loss of an incident particle. C1 SFA INC,LANDOVER,MD 20875. UNIV MARYLAND,CATONSVILLE,MD 21228. RP WEAVER, BD (reprint author), USN,RES LAB,CODE 6615,WASHINGTON,DC 20375, USA. NR 35 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAY 20 PY 1994 VL 225 IS 3-4 BP 381 EP 387 DI 10.1016/0921-4534(94)90739-0 PG 7 WC Physics, Applied SC Physics GA NP354 UT WOS:A1994NP35400025 ER PT J AU LINCHUNG, PJ RAJAGOPAL, AK AF LINCHUNG, PJ RAJAGOPAL, AK TI ELECTRONIC EXCITATIONS IN NANOSCALE SYSTEMS WITH HELICAL SYMMETRY SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID CYLINDRICAL TUBULES; MICROTUBULES AB A complete set of helically symmetric wave functions is constructed and is used to set up the Bloch-like states for describing the electronic band structure of nanoscale systems with helical symmetry. Various helical arrangements leading to different graphitic tubules may be obtained by rolling the two-dimensional honeycomb lattice into a cylinder subjected to appropriate periodic boundary conditions. A discussion of the symmetries of these helices is given. This method is applied to study the electronic structure of graphitic tubules and is compared with other methods found in the literature. RP LINCHUNG, PJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 21 Z9 21 U1 0 U2 2 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 MAY 16 PY 1994 VL 6 IS 20 BP 3697 EP 3706 DI 10.1088/0953-8984/6/20/009 PG 10 WC Physics, Condensed Matter SC Physics GA NP430 UT WOS:A1994NP43000009 ER PT J AU SISKIND, DE MINSCHWANER, K ECKMAN, RS AF SISKIND, DE MINSCHWANER, K ECKMAN, RS TI PHOTODISSOCIATION OF O-2 AND H2O IN THE MIDDLE ATMOSPHERE - COMPARISON OF NUMERICAL-METHODS AND IMPACT ON MODEL O-3 AND OH SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SCHUMANN-RUNGE BANDS; CROSS-SECTIONS; NITRIC-OXIDE; STRATOSPHERE; ABSORPTION; OXYGEN; MESOSPHERE; RESOLUTION; NM AB We have compared three photochemical diurnal models of O3 and OH in the upper stratosphere and mesosphere which use different techniques for calculating the absorption of solar ultraviolet radiation by the O2 Schumann-Runge bands. One model uses a detailed line-by-line representation of the O2 cross section from 1750-2050 angstrom, while the two others use lower resolution, parameterized cross sections. Using the parameterized cross sections, the calculated O3 profiles for both day and night agree with those obtained from the line-by-line model to within 6%. This appears to eliminate inaccuracies in the parameterized O2 cross section as a major cause of previously reported model O3 deficits. A portion of the residual differences from the line-byline model are attributed to inaccuracies in the calculated H2O photolysis rate. A parameterized H2O cross section is offered which improves the accuracy of this calculation. C1 NATL CTR ATMOSPHER RES,ADV STUDY PROGRAM,BOULDER,CO 80307. NASA,LANGLEY RES CTR,HAMPTON,VA 23681. RP SISKIND, DE (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7641,WASHINGTON,DC 20375, USA. NR 14 TC 10 Z9 10 U1 2 U2 6 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 MAY 15 PY 1994 VL 21 IS 10 BP 863 EP 866 DI 10.1029/94GL00457 PG 4 WC Geosciences, Multidisciplinary SC Geology GA NM103 UT WOS:A1994NM10300005 ER PT J AU SANGHERA, JS BUSSE, LE AGGARWAL, ID AF SANGHERA, JS BUSSE, LE AGGARWAL, ID TI EFFECT OF SCATTERING CENTERS ON THE OPTICAL LOSS OF AS2S3 GLASS-FIBERS IN THE INFRARED SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHALCOGENIDE AB Scattering theory has been used to determine the effect of various defects on the scattering loss of As2S3 glass fibers. The scattering is related to the particle shape, size, relative refractive index, and wavelength of light. Bubbles possess the highest relative refractive index and therefore the highest scattering factor. For a given particle size and wavelength, the scattering decreases in the order bubbles>carbon>SiO2>Al2O3>AS2S3. The calculations have been used to predict the maximum tolerable number of defects to obtain low attenuation equal to 10 dB/km at 5.0 mum. RP SANGHERA, JS (reprint author), USN,RES LAB,CODE 56032,WASHINGTON,DC 20375, USA. NR 28 TC 37 Z9 38 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 MAY 15 PY 1994 VL 75 IS 10 BP 4885 EP 4891 DI 10.1063/1.355774 PN 1 PG 7 WC Physics, Applied SC Physics GA NN732 UT WOS:A1994NN73200006 ER PT J AU LUBITZ, P RUBINSTEIN, M CHRISEY, DB HORWITZ, JS BROUSSARD, PR AF LUBITZ, P RUBINSTEIN, M CHRISEY, DB HORWITZ, JS BROUSSARD, PR TI EFFECT OF SURFACE-LAYERS ON FERROMAGNETIC-RESONANCE IN THIN FE FILMS - NI, CO, SI, AND YBA2CU3O7-DELTA SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID SUPERLATTICES; ANISOTROPY AB The results of ferromagnetic resonance experiments on 10 nm polycrystalline films of Fe with very thin surface layers of Ni and Co, using Si and a high temperature superconductor (YBCO) as substrates is reported herein. An earlier fmr investigation of Fe films on YBCO showed strongly temperature dependent linewidths and resonance fields but only small effects in Fe on Si. In this work, the resonance of Fe on Si is found to be significantly narrower when the Fe film has thin (0.5 to 1.0 nm) Ni surface layers, compared to uncoated Fe; linewidths are as narrow as 15 Oe at 9 GHz. However, when YBCO substrates are used, the iron resonance properties are nearly the same as in the case where no Ni was used. This indicates that the effects seen in earlier work were not the result of an oxide layer on the Fe but may indicate a magnetically active surface layer in the YBCO. Co surface layers have the effect of producing strongly temperature dependent anisotropies and linewidths on all substrates used, with the strongest temperature dependence near 160 K, possibly caused by the ordering of an antiferromagnetic surface layer. RP LUBITZ, P (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 6 Z9 6 U1 1 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 MAY 15 PY 1994 VL 75 IS 10 BP 5595 EP 5597 DI 10.1063/1.355652 PN 2A PG 3 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400044 ER PT J AU SANDLUND, L FAHLANDER, M CEDELL, T CLARK, AE RESTORFF, JB WUNFOGLE, M AF SANDLUND, L FAHLANDER, M CEDELL, T CLARK, AE RESTORFF, JB WUNFOGLE, M TI MAGNETOSTRICTION, ELASTIC-MODULI, AND COUPLING FACTORS OF COMPOSITE TERFENOL-D SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID MAGNETIZATION AB Recently it was discovered that composites of Terfenol-D alloys with an insulating binder produce very large magnetostrictions. Resistivities of these composites reach high values, making them attractive for high-frequency applications which require small eddy current losses. In this paper the magnetostriction, magnetization, and Young's moduli measurements made under constant magnetic field conditions and under constant flux conditions are reported. From these measurements, magnetomechanical coupling factors are calculated. The properties are compared to those of ordinary metallic Terfenol-D and nickel. Two different types of composites were investigated. In the first type the composite has an isotropic structure and in the second type, anisotropic. It is shown that the anisotropic type is more desirable since it possesses both higher magnetostriction and higher coupling factors. It is also clearly shown that the magnetization process for the anisotropic type can be explained by a 180-degrees domain wall motion followed by a magnetization rotation. C1 LUND INST TECHNOL,DEPT PROD & MAT ENGN,S-22100 LUND,SWEDEN. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910. RP SANDLUND, L (reprint author), FEREDYN EUROPE,SEMINARIEGATAN 30,S-75228 UPPSALA,SWEDEN. NR 6 TC 162 Z9 182 U1 2 U2 33 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 MAY 15 PY 1994 VL 75 IS 10 BP 5656 EP 5658 DI 10.1063/1.355627 PN 2A PG 3 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400071 ER PT J AU SABLIK, MJ RILEY, LA BURKHARDT, GL KWUN, H CANNELL, PY WATTS, KT LANGMAN, RA AF SABLIK, MJ RILEY, LA BURKHARDT, GL KWUN, H CANNELL, PY WATTS, KT LANGMAN, RA TI MICROMAGNETIC MODEL FOR THE INFLUENCE OF BIAXIAL STRESS ON HYSTERETIC MAGNETIC-PROPERTIES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID FIELD; STEEL AB A micromagnetic formulation has been developed for modeling the effect of biaxial stress on magnetoelastic processes in polycrystalline steels. In particular, the formulation employs the Schneider-Cannell-Watts model and involves substitution of an effective stress equal to one of the deviatoric (i.e., distortional) normal stress components, depending on whether the field is parallel to a tensile or compressive axis or to the third axis perpendicular to the plane of biaxial stress. Computer results are compared to experimental results on the effects of biaxial stress on magnetic properties in mild steel and in SAE-4130 steel. Good qualitative agreement is found in almost all cases, in that in going from one biaxial stress case to the next, the same kinds of changes are seen magnetically. It is also shown from the model and the data that a method can be formulated to nondestructively determine the difference in biaxial stresses. C1 USN,CTR SURFACE WARFARE,ANNAPOLIS,MD 21402. UNIV TASMANIA,HOBART,TAS 7001,AUSTRALIA. RP SABLIK, MJ (reprint author), SW RES INST,PO DRAWER 28510,SAN ANTONIO,TX 78228, USA. OI Riley, Lewis/0000-0001-5921-7296 NR 11 TC 13 Z9 13 U1 1 U2 3 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 MAY 15 PY 1994 VL 75 IS 10 BP 5673 EP 5675 DI 10.1063/1.355633 PN 2A PG 3 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400077 ER PT J AU PETROU, A FU, LP YU, WY LEE, ST JONKER, BT WARNOCK, J AF PETROU, A FU, LP YU, WY LEE, ST JONKER, BT WARNOCK, J TI SPIN-DEPENDENT CONFINEMENT IN DMS-BASED HETEROSTRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID INDUCED TYPE-I->TYPE-II TRANSITION; SUPERLATTICE FORMATION; FIELD; BEHAVIOR AB We describe the results of a magneto-optical study of a class of semiconductor heterostructures in which one of the constituent layers is a diluted magnetic semiconductor (DMS). The large magnetic band splittings of DMS materials result in spin-dependent confining potentials for electrons and holes which can be changed externally by varying the applied magnetic field. The modifications in the band alignment result in changes, sometimes dramatic, of the optical properties in the vicinity of the band gap. C1 SUNY BUFFALO,CTR ELECTR & ELECTROOPT MAT,BUFFALO,NY 14260. USN,RES LAB,WASHINGTON,DC 20375. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP PETROU, A (reprint author), SUNY BUFFALO,DEPT PHYS,BUFFALO,NY 14260, USA. NR 15 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5714 EP 5718 DI 10.1063/1.355593 PN 2A PG 5 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400091 ER PT J AU MAK, CJ BAK, J SOORYAKUMAR, R STEINER, MM JONKER, BT AF MAK, CJ BAK, J SOORYAKUMAR, R STEINER, MM JONKER, BT TI OPTICAL-TRANSITIONS IN (ZNCO)SE AND (ZNFE)SE - ROLE OF AN EFFECTIVE P-D EXCHANGE SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID DILUTED MAGNETIC SEMICONDUCTORS; STRUCTURAL CHARACTERIZATION; ZNSE-CO; SPECTRA; ZN1-XCOXSE; ZN1-XFEXSE; IMPURITIES; EPILAYERS; GAAS(001); PRESSURE AB In this paper we discuss photoluminescence (PL) and Raman excitations in the diluted magnetic semiconductors Zn1-xCoxSe and Zn1-xFexSe. The PL spectra associated with isolated crystal field d levels are found to rapidly weaken and/or broaden as the transition metal ion concentration approaches and increases beyond a critical value. In addition a Raman continuum, that overlaps with the optical phonon, is observed to develop when the PL features are modified. In the corresponding Zn1-xCoxSe samples the optical phonons acquire a characteristic Fano line shape suggestive of its coupling to the Raman continuum. It is proposed that these changes to the optical transitions arise from the enhancement of an effective p-d hybridization between low-lying d levels and band electrons with increasing x-an effect largely due to the proximity of the Co2+ and Fe2+ crystal field ground levels to the valence band maximum. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MAK, CJ (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. RI Mak, Chee Leung/D-4906-2016 OI Mak, Chee Leung/0000-0002-2992-7884 NR 35 TC 5 Z9 5 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 MAY 15 PY 1994 VL 75 IS 10 BP 5719 EP 5724 DI 10.1063/1.355594 PN 2A PG 6 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400092 ER PT J AU JONKER, BT ABAD, H FU, LP YU, WY PETROU, A WARNOCK, J AF JONKER, BT ABAD, H FU, LP YU, WY PETROU, A WARNOCK, J TI COEXISTENCE OF BRILLOUIN AND VANVLECK SPIN-EXCHANGE IN ZN1-XMNXSE ZN1-YFEYSE SPIN SUPERLATTICE STRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID HETEROSTRUCTURES; ZN1-XMNXSE AB We have studied a new type of semiconductor quantum well system in which the carrier-ion exchange interactions are determined by the spin of the carrier. The samples consist of alternating layers of Zn1-xMnxSe and Zn1-yFeySe grown by molecular-beam epitaxy (MBE). At zero field, the carriers initially interact randomly with both transition metal species. When a magnetic field is applied, the excitonic wave functions are increasingly localized in one or the other of the magnetic layers according to their spin state as the competing spin exchange interactions define the confining potential. The spin components of the heavy hole exciton are subsequently dominated by different exchange interactions as revealed by their temperature and field dependence: the behavior of the spin-down component (-3/2,-1/2) is described by exchange interactions of the carriers with the Mn2+ ions and exhibits Brillouin paramagnetic behavior, while the spin-up component (+3/2,+1/2) is dominated by interactions with Fe2+ ions and exhibits Van Vleck paramagnetism. These structures are thus characterized-by an initial competition and eventual coexistence of Brillouin- and Van Vleck-like paramagnetic behavior for the exciton. C1 SUNY BUFFALO,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 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 MAY 15 PY 1994 VL 75 IS 10 BP 5725 EP 5727 DI 10.1063/1.355595 PN 2A PG 3 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400093 ER PT J AU PROKSCH, R FOSS, S DAHLBERG, ED PRINZ, G AF PROKSCH, R FOSS, S DAHLBERG, ED PRINZ, G TI MAGNETIC FINE-STRUCTURE OF DOMAIN-WALLS IN IRON FILMS OBSERVED WITH A MAGNETIC FORCE MICROSCOPE SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID MICROMAGNETICS AB The submicron magnetic structure of domain walls in a single-crystal iron film has been studied using a magnetic force microscope (MFM). The MFM tip was sensitized to the component of the field perpendicular to the film plane. The sample examined was a 500-nm-thick single-crystal film of iron, grown by molecular-beam epitaxy (MBE). Before it was imaged, the film was magnetized along its (in-plane) easy axis in a 2000-Oe field. Studies of the domain structure at numerous locations on the film surface revealed a rich variety of micromagnetic phenomena. Parallel domain walls, determined to be Bloch walls with a width of 70-100 nm, were seen along the easy axis, spaced roughly 30 mum apart. These appeared to be Bloch walls. Bloch lines were also observed in the walls with an average periodicity of 1.5 mum. This is a value smaller than that predicted for Bloch wall-line structures. In addition, a pronounced zig-zag structure was observed, as expected from previous Fe whisker observations. C1 UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. USN,RES LAB,WASHINGTON,DC 20375. NR 10 TC 9 Z9 9 U1 0 U2 3 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 MAY 15 PY 1994 VL 75 IS 10 BP 5776 EP 5778 DI 10.1063/1.355613 PN 2A PG 3 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400111 ER PT J AU AYERS, JD HARRIS, VG SPRAGUE, JA ELAM, WT AF AYERS, JD HARRIS, VG SPRAGUE, JA ELAM, WT TI NUCLEATION OF THE NANOCRYSTALLINE PHASE IN FE73.5CU1NB3SI13.5B9 SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP AYERS, JD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 0 TC 4 Z9 4 U1 1 U2 3 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 MAY 15 PY 1994 VL 75 IS 10 BP 5801 EP 5801 DI 10.1063/1.355569 PN 2A PG 1 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400121 ER PT J AU IDZERDA, YU LIN, HJ HO, G MEIGS, G CHAIKEN, A PRINZ, GA CHEN, CT AF IDZERDA, YU LIN, HJ HO, G MEIGS, G CHAIKEN, A PRINZ, GA CHEN, CT TI ELEMENT-SPECIFIC MAGNETIC HYSTERESIS CURVES OF FE/CU/CO MULTILAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 1 TC 2 Z9 2 U1 0 U2 0 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 MAY 15 PY 1994 VL 75 IS 10 BP 5808 EP 5808 DI 10.1063/1.355573 PN 2A PG 1 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400125 ER PT J AU KAO, CC CHEN, CT JOHNSON, ED IDZERDA, YU HASTINGS, JB AF KAO, CC CHEN, CT JOHNSON, ED IDZERDA, YU HASTINGS, JB TI SOFT-X-RAY MAGNETOOPTICAL KERR-EFFECT SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. USN,RES LAB,WASHINGTON,DC 20375. RP KAO, CC (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. NR 0 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 5810 EP 5810 DI 10.1063/1.355575 PN 2A PG 1 WC Physics, Applied SC Physics GA NN734 UT WOS:A1994NN73400127 ER PT J AU LEVY, M SCARMOZZINO, R OSGOOD, RM WOLFE, R CADIEU, FJ HEGDE, H GUTIERREZ, CJ PRINZ, GA AF LEVY, M SCARMOZZINO, R OSGOOD, RM WOLFE, R CADIEU, FJ HEGDE, H GUTIERREZ, CJ PRINZ, GA TI PERMANENT-MAGNET FILM MAGNETOOPTIC WAVE-GUIDE ISOLATOR SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID FEXCO1-X ALLOY-FILMS; GUIDE; ZNSE(001) AB Recent advances in high-coercivity planar-magnetization film magnets and Bi-YIG (bismuth-substituted yttrium iron garnet) film technology have opened up the possibility of fabricating very small magneto-optic devices. In this article we demonstrate that these two technologies can be brought together to fabricate a high performance waveguide magneto-optic isolator for use in integrated optical circuits. The device operates at 1.55-mum wavelength and consists of a waveguide etched into a Bi-YIG film whose magnetization is saturated by a 22-mum-thick ThCu7-type SmCo magnet with a coercivity of 4 kOe. Isolation ratios of 25 dB have been obtained in the wavelength region between 1490 and 1555 nm. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. CUNY QUEENS COLL,DEPT PHYS,FLUSHING,NY 11367. USN,RES LAB,WASHINGTON,DC 20375. RP LEVY, M (reprint author), COLUMBIA UNIV,MICROELECTR SCI LAB,NEW YORK,NY 10027, USA. NR 8 TC 18 Z9 18 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 MAY 15 PY 1994 VL 75 IS 10 BP 6286 EP 6288 DI 10.1063/1.355426 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600022 ER PT J AU CHEN, CT IDZERDA, YU LIN, HJ MEIGS, G HO, G SMITH, NV AF CHEN, CT IDZERDA, YU LIN, HJ MEIGS, G HO, G SMITH, NV TI EXPERIMENTAL INVESTIGATION OF THE MAGNETIC CIRCULAR-DICHROISM SUM-RULES SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV PENN,PHILADELPHIA,PA 19104. RP CHEN, CT (reprint author), AT&T BELL LABS,600 MT AVE,MURRAY HILL,NJ 07974, USA. NR 2 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6378 EP 6378 DI 10.1063/1.355355 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600059 ER PT J AU CULLEN, JR HATHAWAY, KB AF CULLEN, JR HATHAWAY, KB TI EXCHANGE COUPLING BETWEEN FERROMAGNETIC LAYERS - EFFECT OF QUANTUM-WELL STATES SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP CULLEN, JR (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,WHITE OAK DETACHMENT,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 1 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 6475 EP 6475 DI 10.1063/1.356968 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600097 ER PT J AU RUBINSTEIN, M TEJADA, J ZHANG, XX AF RUBINSTEIN, M TEJADA, J ZHANG, XX TI MAGNETIC-PROPERTIES OF AN FE/CU GRANULAR MULTILAYER SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID MAGNETORESISTANCE AB A Cu/Fe granular film, formed from a multilayer film and composed of particles of Fe imbedded in Cu, has had several of its important properties investigated. Measurements include ferromagnetic resonance, magnetoresistance, Mossbauer effect, magnetic viscosity, and magnetization. The two-phase behavior of these immiscible alloy systems, and the effect of multilayering on the shape of the magnetic precipitates, can explain some of these properties. An explanation of the ferromagnetic resonance line shape is proffered. An extraordinary macroscopic quantum tunneling effect is found to govern the magnetic relaxation at the lowest temperatures. C1 UNIV BARCELONA,DEPT FIS FONAMENTAL,E-08028 BARCELONA,SPAIN. RP RUBINSTEIN, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Zhang, xixiang/D-7046-2011; Tejada, Javier/A-5832-2009 OI Zhang, xixiang/0000-0002-3478-6414; Tejada, Javier/0000-0001-9246-5566 NR 13 TC 8 Z9 8 U1 0 U2 3 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 MAY 15 PY 1994 VL 75 IS 10 BP 6557 EP 6559 DI 10.1063/1.356947 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600130 ER PT J AU HARRIS, VG KAATZ, FH BROWNING, V GILLESPIE, DJ EVERETT, RK ERVIN, AM ELAM, WT EDELSTEIN, AS AF HARRIS, VG KAATZ, FH BROWNING, V GILLESPIE, DJ EVERETT, RK ERVIN, AM ELAM, WT EDELSTEIN, AS TI STRUCTURE AND MAGNETISM OF HEAT-TREATED NANOCRYSTALLINE CU80C20 POWDERS PREPARED VIA CHEMICAL MEANS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID GIANT MAGNETORESISTANCE AB Nanocrystalline Cu80Co20 powders were fabricated using a chemical precipitation technique. As-prepared powders consist of metal-oxides having an average particle size of 100 angstrom. When appropriately heat treated, these powders reduce to form a CuCo face-centered cubic alloy; heat treatments at higher temperatures (greater-than-or-equal-to 400-degrees-C) facilitate the phase separation of the alloy to its elemental components. Concurrent with an increase in annealing temperature, the coercive field decreases while the magnetization increases, reflecting particle coarsening and the relative amount of free cobalt in the mixture. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009; OI Everett, Richard/0000-0002-6725-9442 NR 6 TC 2 Z9 2 U1 0 U2 0 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 MAY 15 PY 1994 VL 75 IS 10 BP 6610 EP 6612 DI 10.1063/1.356914 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600153 ER PT J AU RUBINSTEIN, M DAS, B CHRISEY, DB HORWITZ, J KOON, NC AF RUBINSTEIN, M DAS, B CHRISEY, DB HORWITZ, J KOON, NC TI FERROMAGNETIC-RESONANCE STUDIES OF GRANULAR-MATERIALS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP RUBINSTEIN, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 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 MAY 15 PY 1994 VL 75 IS 10 BP 6622 EP 6622 DI 10.1063/1.356898 PN 2B PG 1 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600158 ER PT J AU ROESLER, GM IDZERDA, YU BROUSSARD, PR OSOFSKY, MS AF ROESLER, GM IDZERDA, YU BROUSSARD, PR OSOFSKY, MS TI RESISTIVITY ANOMALY IN NONMAGNETIC METALS WITH FERROMAGNETIC INSULATOR PROXIMITY LAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID CR AB Epitaxial bilayers and multilayers were prepared using the ferromagnetic insulator EuO and the metals V and Ag. For metal films of thickness 10 nm or less, there is a sharp change in the slope of the resistivity versus temperature, which occurs at 86 K for EuO/V specimens and at 50 K for EuO/Ag specimens. Soft x-ray magnetic circular dichroism measurements showed a clear dichroism for Eu but none for V. Therefore, the dR/dT discontinuity is attributed to a change in spin-dependent surface scattering at the insulator/metal interface caused by the magnetization of the surface layer of Eu++ ions. The difference in temperature between the dR/dT discontinuities between the two metals (and from the bulk EuO Curie temperature of 70 K) is tentatively attributed to the influence of the Ruderman-Kittel-Kasuya-Yosida (RKK-Y) mechanism. RP ROESLER, GM (reprint author), USN,RES LAB,CODE 6340,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 9 TC 4 Z9 4 U1 1 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 MAY 15 PY 1994 VL 75 IS 10 BP 6679 EP 6681 DI 10.1063/1.356893 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600180 ER PT J AU KREBS, JJ LIND, DM LOCHNER, E SHAW, KA PORTWINE, W BERRY, SD AF KREBS, JJ LIND, DM LOCHNER, E SHAW, KA PORTWINE, W BERRY, SD TI MAGNETIC AND CRYSTALLOGRAPHIC PROPERTIES OF MOLECULAR-BEAM EPITAXIALLY GROWN FE3O4/NIO SUPERLATTICES AND FE3O4 FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID THIN-FILMS; SUPERLATTICES AB Ferromagnetic resonance, SQUID magnetometry, and x-ray diffraction have been used to characterize a set of [Fe3O4(68 angstrom)/NiO(17 angstrom)]N superlattices (SL) with N=3, 10, 30, and 100, as well as a 1.5-mum-thick Fe3O4 film. For this NiO thickness, Fe3O4 layers are strongly coupled and the in-plane anisotropy is much less than the 330-Oe ferromagnetic resonance (FMR) linewidth at 35 GHz. Both in-plane and perpendicular FMR at 9.5 and 35 GHz have been used, with the 9.5-GHz data showing significant hysteresis associated with the sample magnetization. X-ray diffraction indicates that both the film and SL's are nearly cubic single-crystalline structures with long-range coherence. The 300 K magnetization data indicate the presence of small cubic anisotropy in the SL's, although bulklike Fe3O4 magnetic ordering in the thick single film. When the Fe3O4 film is cooled below the Verwey transition in a 10 kOe field (aligned along (100)), the FMR shows that the sample develops a large uniaxial (K(u) = 1.8 kOe) in-plane anisotropy with its easy axis along the field direction. Decreased microwave loss also occurs abruptly at the film T(V). C1 FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,MARTECH,TALLAHASSEE,FL 32306. RP KREBS, JJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 8 Z9 8 U1 1 U2 3 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 MAY 15 PY 1994 VL 75 IS 10 BP 6688 EP 6690 DI 10.1063/1.356896 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600183 ER PT J AU HARRIS, VG RUBINSTEIN, M DAS, BN KOON, NC AF HARRIS, VG RUBINSTEIN, M DAS, BN KOON, NC TI CORRELATION OF X-RAY-DIFFRACTION AND MOSSBAUER-EFFECT MEASUREMENTS WITH MAGNETIC-PROPERTIES OF HEAT-TREATED CU80CO15FE5 RIBBONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID GIANT MAGNETORESISTANCE AB X-ray diffraction (XRD) and Mossbauer Effect (ME) measurements were performed on heat-treated Cu80Co15Fe5 melt-spun ribbons in an attempt to understand the trends in magnetic properties with heat treatment. ME measurements indicate that the majority of Fe atoms (86%) occupy sites in ferromagnetic FCC CoFe clusters after the initial quench. A heat treatment at 900-degrees-C acts to complete the chemical separation of Fe from the Cu matrix. The presence of Co in the Cu matrix, even after high temperature anneals, provides a paramagnetic component that prohibits saturation even at high fields. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 14 TC 3 Z9 3 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 MAY 15 PY 1994 VL 75 IS 10 BP 6924 EP 6926 DI 10.1063/1.356782 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600278 ER PT J AU LIU, X SOORYAKUMAR, R GUTIERREZ, CJ PRINZ, GA AF LIU, X SOORYAKUMAR, R GUTIERREZ, CJ PRINZ, GA TI EXCHANGE STIFFNESS AND MAGNETIC ANISOTROPIES IN BCC FE1-XCOX ALLOYS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID FERROMAGNETIC TRANSITION-METALS; MOLECULAR-BEAM EPITAXY; SPIN-WAVES; GAAS; NICKEL; CO AB Brillouin scattering measurements from several bcc Fe1-xCox epitaxial films are reported. The magnetic-field dependence of the spin-wave spectrum as well as the in-plane directional dependence of the surface magnon are determined. The saturation magnetization of the alloys was measured independently through superconducting quantum interference device magnetometry. Self-consistent fitting of the magnon dispersions determined from the separate Brillouin experiments provide values for the concentration dependence of the exchange stiffness D, the fourth-order crystalline cubic anisotropy K1, and surface anisotropies K(s) and K(s,p). In agreement with ferromagnetic resonance data, K1 is found to change sign for x beyond about 35 at. % while D steadily increases with cobalt concentration up to x-0.5 and subsequently decreases in two Co-rich samples. C1 USN,RES LAB,WASHINGTON,DC 20375. RP LIU, X (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. NR 18 TC 19 Z9 19 U1 1 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 MAY 15 PY 1994 VL 75 IS 10 BP 7021 EP 7023 DI 10.1063/1.356763 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600314 ER PT J AU BILIC, D DAHLBERG, ED CHAIKEN, A GUTIERREZ, C LUBITZ, P KREBS, JJ HARFORD, MZ PRINZ, GA AF BILIC, D DAHLBERG, ED CHAIKEN, A GUTIERREZ, C LUBITZ, P KREBS, JJ HARFORD, MZ PRINZ, GA TI MAGNETIZATION REVERSAL IN COFE/AG/FE/ZNSE THIN-LAYER SANDWICHES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 38th Annual Conference on Magnetism and Magnetic Materials (MMM 93) CY NOV 15-18, 1993 CL MINNEAPOLIS, MN SP AMER INST PHYS, MAGNET SOC, IEEE, MINERALS MET & MAT SOC, AMER SOC TESTING & MAT, USN, OFF NAVAL RES, AMER CERAM SOC ID FILMS AB In recent work [J. Appl. Phys. 70, 10 (1991)] the spin valve effect (SVE) was measured in CoxFe1-x/Ag/Fe(x<0.7) thin layer sandwiches grown by molecular beam epitaxy. The field dependence of the SVE was correlated with VSM magnetization data taken on the samples. It was found that only at low fields was there a correlation between the SVE resistance and the magnetization data. These results indicated a more complex reversal mechanism that included substantial magnetizations in directions not measured in traditional VSM measurements. In order to more accurately determine the field-dependent magnetization of the samples during reversal, the longitudinal and transverse Kerr effects were measured on the layers. The particular geometry used to measure the Kerr effects was for the light scattering plane to be perpendicular to the applied magnetic field. The transverse Kerr effect data, which in this geometry are sensitive to the magnetization parallel to the applied magnetic field, replicated the VSM data. The longitudinal Kerr effect, which is sensitive to the net magnetization perpendicular to the applied field (in the plane of the film), indicated a substantial perpendicular magnetization component. Based upon previous work on epitaxial iron filMS,2-4 it appears that the magnetization reversal process proceeds by transitions between easy axes. From these measurements, the anomalous resistances observed as a function of the applied magnetic field in J. Appl. Phys. 70, 10 (1991), are explained by having one of the films soft, and two easy axes in the plane of the other film. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BILIC, D (reprint author), UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455, USA. NR 6 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1994 VL 75 IS 10 BP 7073 EP 7075 DI 10.1063/1.356730 PN 2B PG 3 WC Physics, Applied SC Physics GA NN736 UT WOS:A1994NN73600333 ER PT J AU PLANT, WJ TERRAY, EA PETITT, RA KELLER, WC AF PLANT, WJ TERRAY, EA PETITT, RA KELLER, WC TI THE DEPENDENCE OF MICROWAVE BACKSCATTER FROM THE SEA ON ILLUMINATED AREA - CORRELATION TIMES AND LENGTHS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID OCEAN WAVES; RADAR; SPECTRA; IMAGERY AB During the Synthetic Aperture Radar (SAR) and X band Ocean Nonlinearities-Forschungsplattform Nordsee experiment, we mounted two continuous wave microwave systems on an elevator on the German Research Platform Nordsee for the purpose of investigating the dependence of microwave backscatter from the sea surface on illuminated area. The two systems operated at X and ka bands (10 and 35 GHz) and collected HH and VV polarized backscattered signals simultaneously. The elevator system allowed us to vary the altitude of the two microwave systems above the sea surface from 7.5 to 27 m, always in the far field of the antennas. Most data were collected at a 45-degrees incidence angle, which implied that the Ka band system illuminated areas from 0.4 to 6.0 m2 while the X band system viewed spots between 2.9 and 41.3 m . We examined the dependence of the normalized radar cross section (sigma0), its variance, and the bandwidth of the Doppler spectrum on illuminated areas. We were unable to detect any dependence of sigma0 on area but found a definite decrease in its variance as area increased. At X band the variance divided by the square of sigma0, the normalized variance, decreased from values near 12 for small areas to values near 2 for large areas. At Ka band, corresponding values were 40 and 2. The normalized variance was always slightly larger for HH polarization. By fitting the area dependence of the normalized variance to available theory, we deduce that correlation lengths are on the order of 10 times the microwave wavelength at both X and Ka band. Values for the normalized variance of an elementary scattering facet were also inferred and are presented in this paper. From the Doppler bandwidths we obtained radial velocity spreads over the illuminated areas and found that they agreed well at X and Ka band. These velocity spreads, which axe inversely proportional to the correlation time of the backscatter, increased rapidly with illuminated area for small areas but tended to level off to values of about 0.5 m s-1 at large areas. This implies a decorrelation time for large illuminated areas of about 10 ms at X band and 3 ms at Ka band but somewhat larger values for small areas. The dependence of the velocity spread was found to be well explained by theory if an intrinsic velocity spread of 0.07 m s-1 was used to represent scatterer lifetime effects. C1 WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. USN,RES LAB,WASHINGTON,DC 20375. RP PLANT, WJ (reprint author), UNIV WASHINGTON,COLL OCEAN & FISHERY SCI,APPL PHYS LAB,SEATTLE,WA 98105, USA. NR 18 TC 36 Z9 36 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 MAY 15 PY 1994 VL 99 IS C5 BP 9705 EP 9723 DI 10.1029/93JC00862 PG 19 WC Oceanography SC Oceanography GA NL930 UT WOS:A1994NL93000002 ER PT J AU ASKARI, F KELLER, WC AF ASKARI, F KELLER, WC TI REAL APERTURE RADAR IMAGING OF OCEAN WAVES DURING SAXON-FPN - A CASE OF AZIMUTH-TRAVELING WAVES SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID AFFECTING MICROWAVE BACKSCATTER; SURFACE-WAVES; WIND; SPECTRA; DEPENDENCE; MODULATION; SWELL AB This paper investigates the radar imaging of ocean waves under two separate wind speed and sea state conditions using an X band real aperture radar (RAR). It is shown experimentally that for the case of higher sea state and wind speed. (9.1 m/s), the RAR is capable of imaging the waves from all directions including the azimuth. The case for low sea state and wind speed (4.5 m/s), however, shows somewhat stronger imaging contrast in the range direction with reduced contrast for the azimuth-traveling waves. The results of the aircraft observations are compared with numerical simulations of a RAR imaging model. Simulations show that cross tilt is a viable mechanism for enhancing the azimuthal modulations, but the results are sensitive to the level of upwind/cross-wind anisotropy of the shortwave spectrum. Simulations also show that the variations in incidence angle create irregulatities in the azimuthal angle distribution. C1 UNIV WASHINGTON,APPL PHYS LAB,SEATTLE,WA 98105. RP ASKARI, F (reprint author), USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375, USA. NR 24 TC 4 Z9 4 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 MAY 15 PY 1994 VL 99 IS C5 BP 9817 EP 9833 DI 10.1029/93JC01903 PG 17 WC Oceanography SC Oceanography GA NL930 UT WOS:A1994NL93000009 ER PT J AU HORTON, C KERLING, J ATHEY, G SCHMITZ, J CLIFFORD, M AF HORTON, C KERLING, J ATHEY, G SCHMITZ, J CLIFFORD, M TI AIRBORNE EXPENDABLE BATHYTHERMOGRAPH SURVEYS OF THE EASTERN MEDITERRANEAN SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID GENERAL-CIRCULATION; LEVANTINE BASIN; VARIABILITY; STRAITS; SEA AB Two extensive airborne expendable bathythermograph (AXBT) surveys of the eastern Mediterranean were conducted during December 1991 and July 1992 from a Naval Oceanographic Office RP-3 aircraft. Larger areas were sampled over shorter periods of time than is possible with conventional surveys carried out by ships. The circulation of the eastern Mediterranean consists of a collection of subgyres and fronts which show surprising seasonal and interannual variability. These surveys help to describe further this variability which is only partially understood. In particular, the surveys provide additional evidence that a relatively strong anticyclone located adjacent to the southeast comer of Crete during the late summer and through fall is a consequence of strong north winds from the Aegean, the Etesians, being blocked by Crete. Also notable in both surveys was the absence of ''a'' strong Mersa-Matruh gyre, an anticyclone or anticyclonic subgyre off the Egyptian coast generally considered to be permanent. In contrast to published earlier observations, the Mersa Matruh gyre system was more a collection of weaker anticyclones rather than a single, sometimes double centered, strong feature. In both surveys we saw a string of anticyclones off the African coast between about 24-degrees and 32-degrees-E. In general, these eddies did not exhibit a significant surface thermal structure, but were most evident in the 200 m to 300 m-depth depictions. It may be that the formation of a strong southeast Crete anticyclone inhibits the formation of a large, relatively strong Mersa-Matruh subgyre by interacting with the mid-Mediterranean jet. If so, then both the southeast Crete anticyclone and the Mersa-Matruh anticyclone could both be recurrent but tend to occur at different times. RP HORTON, C (reprint author), USN,OCEANOG OFF,BAY ST LOUIS,MS 39522, USA. NR 15 TC 21 Z9 21 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-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1994 VL 99 IS C5 BP 9891 EP 9905 DI 10.1029/94JC00058 PG 15 WC Oceanography SC Oceanography GA NL930 UT WOS:A1994NL93000013 ER PT J AU WEISSMAN, DE DAVIDSON, KL BROWN, RA FRIEHE, CA LI, F AF WEISSMAN, DE DAVIDSON, KL BROWN, RA FRIEHE, CA LI, F TI THE RELATIONSHIP BETWEEN THE MICROWAVE RADAR CROSS-SECTION AND BOTH WIND-SPEED AND STRESS - MODEL FUNCTION STUDIES USING FRONTAL AIR-SEA INTERACTION EXPERIMENT DATA SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID INTERACTION EXPERIMENT FASINEX; DRAG COEFFICIENT; OCEAN SURFACE; WATER-SURFACE; HEAT-FLUX; DEPENDENCE; WAVE; STATE; SCATTEROMETER; SPECTRA AB The Frontal Air-Sea Interaction Experiment (FASINEX) provided a unique data set with coincident airborne scatterometer measurements of the ocean surface radar cross section (RCS) (at Ku band) and near-surface wind and wind stress. These data have been analyzed to study new model functions which relate wind speed and surface friction velocity (square root of the kinematic wind stress) to the radar cross section and to better understand the processes in the boundary layer that have a strong influence on the radar backscatter. Studies of data from FASINEX indicate that the RCS has a different relation to the friction velocity than to the wind speed. The difference between the RCS models using these two variables depends on the polarization and the incidence angle. The radar data have been acquired from the Jet Propulsion Laboratory airborne scatterometer. These data span 10 different flight days. Stress measurements were inferred from shipboard instruments and from aircraft flying at low altitudes, closely following the scatterometer. Wide ranges of radar incidence angles and environmental conditions needed to fully develop algorithms are available from this experiment. C1 USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93940. UNIV CALIF IRVINE,DEPT MECH ENGN,IRVINE,CA 92717. NASA,JET PROP LAB,PASADENA,CA 91109. UNIV WASHINGTON,DEPT ATMOSPHER SCI,SEATTLE,WA 98195. RP WEISSMAN, DE (reprint author), HOFSTRA UNIV,DEPT ENGN,HEMPSTEAD,NY 11550, USA. NR 46 TC 26 Z9 26 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-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1994 VL 99 IS C5 BP 10087 EP 10108 DI 10.1029/93JC03371 PG 22 WC Oceanography SC Oceanography GA NL930 UT WOS:A1994NL93000025 ER PT J AU SPIEL, DE AF SPIEL, DE TI THE NUMBER AND SIZE OF JET DROPS PRODUCED BY AIR BUBBLES BURSTING ON A FRESH-WATER SURFACE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article AB The size distributions of the jet drops produced by individual air bubbles bursting on a fresh water surface are presented. The bubbles studied ranged in size from 349 to 1479 mum radius. The probability that a bubble of radius r(b) produces at least n drops, p(r(b), n), is given for n up to 7. The underwater sound made by collapsing bubbles is discussed briefly. RP SPIEL, DE (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 17 TC 35 Z9 35 U1 1 U2 9 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 MAY 15 PY 1994 VL 99 IS C5 BP 10289 EP 10296 DI 10.1029/94JC00382 PG 8 WC Oceanography SC Oceanography GA NL930 UT WOS:A1994NL93000038 ER PT J AU SIECKMANN, DG HOLMES, K HORNBECK, P MARTIN, E GUELDE, G BONDADA, S LONGO, DL KENNY, JJ AF SIECKMANN, DG HOLMES, K HORNBECK, P MARTIN, E GUELDE, G BONDADA, S LONGO, DL KENNY, JJ TI B-CELLS FROM M167 MU-KAPPA TRANSGENIC MICE FAIL TO PROLIFERATE AFTER STIMULATION WITH SOLUBLE ANTI-IG ANTIBODIES - A MODEL FOR ANTIGEN-INDUCED B-CELL ANERGY SO JOURNAL OF IMMUNOLOGY LA English DT Article ID IMMUNE-DEFICIENT MICE; MURINE LYMPHOCYTES-B; ENDOGENOUS IMMUNOGLOBULIN; MONOCLONAL-ANTIBODIES; MOUSE LYMPHOCYTES; MEMBRANE IGM; ACTIVATION; GENES; EXPRESSION; GROWTH AB The transgenic (TG) mouse strain 207-4, carries mu(a) + kappa transgenes ligated to the anti-phosphocholine (PC) V(H)1 and V kappa 24 V region genes from the MOPC-167 myeloma. Although B cells from mice carrying these transgenes respond both in vivo and in vitro to thymus-dependent Ags, they failed to proliferate in response to soluble goat anti-mu Ab or other soluble anti-Ig reagents. On the other hand, B cells from the Sp6 mu kappa anti-trinitrophenyl TG mouse line proliferated normally after stimulation with soluble anti-mu. However, the 207-4 anti-PC transgene positive (TG(+)) splenic B cells proliferated when stimulated with anti-mu, anti-idiotype, anti-allotype, or PC-conjugated to Sepharose beads. TG(+) B cells were also induced to proliferate when stimulated with anti-Lyb-2; thus, their defect may be restricted to signaling through sIgM. The lack of response to soluble anti-mu could not be reversed by addition of IL-4, by removal of T cells, by addition of anti-FcR Ab, or by stimulation with F(ab')(2) anti-mu. Thus, the failure to proliferate was not caused by active T cell suppression or FcR-mediated inhibition. In mixed cultures of TC+ and transgene negative (TC-) spleen cells, the TC- cells were able to proliferate normally to soluble anti-mu, indicating that suppressive factors were not involved in the unresponsiveness of the TG(+) anti-PC-specific B cells. These studies suggest that B cells in the 207-4 anti-PC TG mice exhibit a defect in activation through their sIgM receptors, and this unresponsiveness may reflect a form of Ag-induced tolerance. C1 NIAID, RESOURCES BRANCH, BETHESDA, MD 20892 USA. NIAID, IMMUNOPATHOL LAB, BETHESDA, MD 20892 USA. UNIV MARYLAND, DEPT MED, DIV RHEUMATOL, BALTIMORE, MD 21201 USA. NCI, FREDERICK CANC RES & DEV CTR, PRI DYNCORP, FREDERICK, MD 21702 USA. UNIV KENTUCKY, DEPT MICROBIOL & IMMUNOL, LEXINGTON, KY 40536 USA. UNIV KENTUCKY, CTR AGING, LEXINGTON, KY 40536 USA. NCI, FREDERICK CANC RES & DEV CTR, BIOL RESPONSE MODIFIERS PROGRAM, FREDERICK, MD 21702 USA. RP SIECKMANN, DG (reprint author), USN, MED RES INST, DEPT INFECT DIS, 8901 WISCONSIN AVE, BETHESDA, MD 20889 USA. FU NCI NIH HHS [N01-CO-74102]; NIAID NIH HHS [R29 AI30822-01A1] NR 49 TC 9 Z9 9 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD MAY 15 PY 1994 VL 152 IS 10 BP 4873 EP 4883 PG 11 WC Immunology SC Immunology GA NK925 UT WOS:A1994NK92500015 PM 8176209 ER PT J AU DAVIDSON, BN PICKETT, WE AF DAVIDSON, BN PICKETT, WE TI GRAPHITE-LAYER FORMATION AT A DIAMOND (111) SURFACE STEP SO PHYSICAL REVIEW B LA English DT Note ID GROWTH-MECHANISM; HYDROGENATION; NUCLEATION; CARBON AB Relaxation of a stepped (111) diamond surface is studied using an accurate, total-energy tight-binding method. We determined that the bare surface will become sp2 bonded near a step. This spontaneous graphitization is accompanied by a large increase in spacing between the surface layers. Band structures of the ideal and relaxed surfaces indicate that surface states are removed from the gap upon relaxation, but additional gap states arise from the lower layers. Addition of hydrogen to the surface will force the C atoms to revert back to sp3 bonding. These results are significant towards the understanding of the behavior of a stepped surface under conditions of film growth or even the possibility of diamond nucleation from graphite. RP DAVIDSON, BN (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 24 Z9 24 U1 1 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 MAY 15 PY 1994 VL 49 IS 20 BP 14770 EP 14773 DI 10.1103/PhysRevB.49.14770 PG 4 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300088 ER PT J AU BAYER, M FORCHEL, A ITSKEVICH, IE REINECKE, TL KNIPP, PA GREUS, C SPIEGEL, R FALLER, F AF BAYER, M FORCHEL, A ITSKEVICH, IE REINECKE, TL KNIPP, PA GREUS, C SPIEGEL, R FALLER, F TI MAGNETIC-FIELD-INDUCED BREAKDOWN OF QUASI-ONE-DIMENSIONAL QUANTUM-WIRE QUANTIZATION SO PHYSICAL REVIEW B LA English DT Note ID WELL WIRES; CONFINEMENT; EMISSION; PHOTOLUMINESCENCE; FABRICATION; SHIFT; BOXES AB Photoluminescence studies of In0.13Ga0.87As/GaAs modulated-barrier quantum wires have been performed in magnetic fields up to B = 9.0 T with varying orientations. By using high optical excitation, emission from three quantum wire subbands is observed. For fields perpendicular to the wires we observe a distinct transformation of the quantization from quasi-one-dimensional quantum-wire states at low fields to fully quantized quasi-zero-dimensional states at higher fields. This change occurs as the Landau orbit sizes for the several subbands decrease compared to the lateral quantum-wire dimension. The experimental results are consistent with numerical calculations for these quantum wires in magnetic fields. C1 USN,RES LAB,WASHINGTON,DC 20375. CHRISTOPHER NEWPORT UNIV,DEPT PHYS & COMP SCI,NEWPORT NEWS,VA 23606. RP BAYER, M (reprint author), UNIV WURZBURG,D-97074 WURZBURG,GERMANY. OI Forchel, Alfred/0000-0002-9377-9935 NR 19 TC 20 Z9 20 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 MAY 15 PY 1994 VL 49 IS 20 BP 14782 EP 14785 DI 10.1103/PhysRevB.49.14782 PG 4 WC Physics, Condensed Matter SC Physics GA NR423 UT WOS:A1994NR42300091 ER PT J AU SCHNUR, JM RATNA, BR SELINGER, JV SINGH, A JYOTHI, G EASWARAN, KRK AF SCHNUR, JM RATNA, BR SELINGER, JV SINGH, A JYOTHI, G EASWARAN, KRK TI DIACETYLENIC LIPID TUBULES - EXPERIMENTAL-EVIDENCE FOR A CHIRAL MOLECULAR ARCHITECTURE SO SCIENCE LA English DT Article ID MICROSTRUCTURES; MEMBRANES; BILAYERS AB Molecular self-assembly is of key importance for the rational design of advanced materials. To investigate the causal relation between molecular structure and the consequent self-assembled microstructure, self-assembled tubules of diacetylenic lipids were studied. Circular-dichroism studies give experimental evidence that the formation of tubules is driven by chiral molecular packing, in agreement with recent theories of tubules. On the basis of these results, a molecular mechanism for the formation of tubules is proposed. C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. RP SCHNUR, JM (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. RI Selinger, Jonathan/D-1445-2010 OI Selinger, Jonathan/0000-0002-4982-2457 NR 27 TC 167 Z9 168 U1 2 U2 27 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 13 PY 1994 VL 264 IS 5161 BP 945 EP 947 DI 10.1126/science.264.5161.945 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NK974 UT WOS:A1994NK97400029 PM 17830081 ER PT J AU LENTINE, AL LEE, JN LEE, SH EFRON, U AF LENTINE, AL LEE, JN LEE, SH EFRON, U TI INTRODUCTION TO THE FEATURE ON SPATIAL LIGHT MODULATORS AND THEIR APPLICATIONS SO APPLIED OPTICS LA English DT Article AB The special issue of Applied Optics on spatial light modulators presents a collection of papers that describe improvements in basic devices, smart pixels, and system applications. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV CALIF SAN DIEGO, DEPT ELECT & COMP ENGN, LA JOLLA, CA 92093 USA. HUGHES RES LABS, MALIBU, CA 90265 USA. RP LENTINE, AL (reprint author), AT&T BELL LABS, ROOM 2F229, 263 SHUMAN BLVD, NAPERVILLE, IL 60566 USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 10 PY 1994 VL 33 IS 14 BP 2767 EP 2767 PG 1 WC Optics SC Optics GA NL042 UT WOS:A1994NL04200001 PM 20885634 ER PT J AU FLOUDAS, G RIZOS, A BROWN, W NGAI, KL AF FLOUDAS, G RIZOS, A BROWN, W NGAI, KL TI DYNAMICS IN CONCENTRATED-SOLUTIONS OF POLY(METHYL METHACRYLATE) BIS(2-ETHYLHEXYL PHTHALATE) SO MACROMOLECULES LA English DT Article ID CONCENTRATION FLUCTUATIONS; POLY(CYCLOHEXYL METHACRYLATE); POLY(PHENYLMETHYL SILOXANE); DIELECTRIC-RELAXATION; AMORPHOUS POLYMERS; PHOTON-CORRELATION; TEMPERATURE; GLASS; DENSITY; SPECTROSCOPY AB Photon correlation spectroscopy (PCS) and dielectric spectroscopy (DS) are employed to study the dynamics of density fluctuations at temperatures above and below the glass transition temperature, T(g), and the dynamics of concentration fluctuations above T(g) in concentrated solutions of poly(methyl methacrylate)/bis(2-ethylhexyl phthalate) (PMMA/DOP). The PCS measurements covered the temperature range between 252 and 373 K, and the DS measurements were made between 200 and 398 K and in the frequency range between 10(-2) and 10(5) Hz. Above T(g) the polarized PCS correlation functions contain contributions from both density and concentration fluctuations for a range of temperatures. The concentration fluctuations are characterized by a relatively narrow distribution of relaxation times compared to the density fluctuations and display the usual q2-dependence. The dynamics of both processes conform to the Vogel-Fulcher-Tammann equation, and the coupling model of relaxation can explain their different temperature dependences. The alpha-relaxation bifurcates into alpha- and beta-relaxations below T(g) which can be followed respectively by PCS and DS. The additive alters significantly the dynamics of the alpha-relaxation and also has a small effect on the dynamics of the beta-relaxation which become faster. Increasing plasticizer content enhances the dielectric beta-relaxation but weakens the alpha-relaxation. At 20 % plasticizer content a single, albeit broad, dielectric relaxation exists (beta-relaxation) which is due to the concerted motion of the polymer side group with the polar additive. Similarities with the internal plasticization of PMMA are discussed. C1 UNIV CRETE,DEPT CHEM,GR-71110 IRAKLION,GREECE. UNIV UPPSALA,DEPT PHYS CHEM,S-75121 UPPSALA,SWEDEN. USN,RES LAB,WASHINGTON,DC 20375. RP FLOUDAS, G (reprint author), MAX PLANCK INST POLYMER RES,POSTFACH 3148,D-55021 MAINZ,GERMANY. RI Rizos, Apostolos/F-6807-2011; Floudas, George/M-7985-2015 NR 37 TC 17 Z9 17 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 9 PY 1994 VL 27 IS 10 BP 2719 EP 2725 DI 10.1021/ma00088a011 PG 7 WC Polymer Science SC Polymer Science GA NL250 UT WOS:A1994NL25000011 ER PT J AU RAMAKER, DE YANG, H IDZERDA, YU AF RAMAKER, DE YANG, H IDZERDA, YU TI FACTORS WHICH DETERMINE THE POPULATIONS OF THE MAGNETIC QUANTUM NUMBER IN AUGER-ELECTRON DIFFRACTION SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article; Proceedings Paper CT 5th International Conference on Electron Spectroscopy (ICES 5) CY JUL 25-AUG 01, 1993 CL INST THEORET PHYS, KIEV, UKRAINE SP ACAD SCI UKRAINE HO INST THEORET PHYS ID X-RAY PHOTOELECTRON; SURFACE ATOMIC-STRUCTURE; ENERGY AUGER; SCATTERING; EMISSION; NI; CRYSTALLOGRAPHY; SPECTROSCOPY; DEPENDENCE AB Comparison of experimental angular resolved Auger data with theoretical calculations reveals that the populations of the magnetic quantum levels, m(l), of the Auger emitter are largely unequal. This is shown to arise in most instances from secondary electron excitation which introduces an alignment in the l wave. Resonant excitation at threshold, shakeoff, and magnetic effects are also observed in the m(l) populations. Detailed expressions are given for calculating the m(l) populations of the Auger wave, for any assumed populations in the core level or ground state valence levels. C1 USN,RES LAB,WASHINGTON,DC 20375. RP RAMAKER, DE (reprint author), GEORGE WASHINGTON UNIV,DEPT CHEM,WASHINGTON,DC 20052, USA. NR 48 TC 14 Z9 14 U1 0 U2 0 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 MAY 6 PY 1994 VL 68 BP 63 EP 75 DI 10.1016/0368-2048(94)02103-1 PG 13 WC Spectroscopy SC Spectroscopy GA NP538 UT WOS:A1994NP53800005 ER PT J AU BERNHARDT, PA WAGNER, LS GOLDSTEIN, JA TRAKHTENGERTS, VY ERMAKOVA, EN RAPOPORT, VO KOMRAKOV, GP BABICHENKO, AM AF BERNHARDT, PA WAGNER, LS GOLDSTEIN, JA TRAKHTENGERTS, VY ERMAKOVA, EN RAPOPORT, VO KOMRAKOV, GP BABICHENKO, AM TI ENHANCEMENT OF STIMULATED ELECTROMAGNETIC EMISSION DURING 2 FREQUENCY IONOSPHERIC HEATING EXPERIMENTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID FIELD-ALIGNED IRREGULARITIES; UPPER HYBRID; PLASMA; INSTABILITY; WAVES; BACKSCATTER; SCATTERING; GENERATION; RADIOWAVE; DENSITY AB We have discovered that stimulated electromagnetic emission (SEE), excited by a powerful electromagnetic (EM) wave (pump 1) in the ionosphere, can be enhanced by a second high power EM wave (pump 2) with a higher frequency. For frequency separations near 0.4 MHz, the downshifted SEE in a 40 kHz band below the frequency of pump 1 is increased by 2 dB when pump 2 is turned on. We theorize that a second EM wave generates plasma irregularities that facilitate the mode conversion of electrostatic waves to yield enhanced EM emissions from pump 1. C1 USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375. NIZHNIY NOVGOROD APPL PHYS INST,NIZHNII NOVGOROD,RUSSIA. NIZHNIY NOVGOROD RADIOPHYS RES INST,NIZHNII NOVGOROD,RUSSIA. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 33 TC 25 Z9 25 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 MAY 2 PY 1994 VL 72 IS 18 BP 2879 EP 2882 DI 10.1103/PhysRevLett.72.2879 PG 4 WC Physics, Multidisciplinary SC Physics GA NJ297 UT WOS:A1994NJ29700015 ER PT J AU ESAREY, E KRALL, J SPRANGLE, P AF ESAREY, E KRALL, J SPRANGLE, P TI ENVELOPE ANALYSIS OF INTENSE LASER-PULSE SELF-MODULATION IN PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID FREE-ELECTRON LASER; ELECTROMAGNETIC-WAVES; STIMULATED RAMAN; RADIATION; BEAMS; GENERATION; SCATTERING AB An envelope equation describing laser pulse self-focusing and optical guiding in plasmas is derived and is used to analyze self-modulation. Included is the plasma wave generated by the pulse front, which leads to periodic focusing, radial energy transport, and laser envelope modulation. The onset criterion and growth rates are calculated and compared to simulations using the envelope equation and a non-linear fluid code. For a long square pulse, onset of strong self-modulation occurs at one-half the power needed for optical guiding. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 32 TC 184 Z9 189 U1 2 U2 14 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 MAY 2 PY 1994 VL 72 IS 18 BP 2887 EP 2890 DI 10.1103/PhysRevLett.72.2887 PG 4 WC Physics, Multidisciplinary SC Physics GA NJ297 UT WOS:A1994NJ29700017 ER PT J AU AHMED, S CHANDRASEKHARA, MS AF AHMED, S CHANDRASEKHARA, MS TI REATTACHMENT STUDIES OF AN OSCILLATING AIRFOIL DYNAMIC STALL FLOWFIELD SO AIAA JOURNAL LA English DT Article AB The reattaching now over an oscillating airfoil executing large-amplitude sinusoidal motion around a mean angle of attack of 10 deg has been studied using the techniques of stroboscopic schlieren, two-component laser Doppler velocimetry, and point diffraction interferometry, for a freestream Mach number of 0.3 and a reduced frequency of 0.05. The results show that the dynamically stalled flow reattaches in a process that begins when the airfoil is very close to the static stall angle on its downward stroke and progresses over the airfoil through a large range of angles of attack as the airfoil angle decreases to about 6 deg. The airfoil suction peak shows a dramatic rise as the static stall angle is approached, and the velocity profiles develop such that the flow near the surface is accelerated. The process completes through the disappearance of a separation bubble that forms over the airfoil. C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. RP AHMED, S (reprint author), MARITIME CENT ANAL TEAM INST,SAN JOSE,CA 95127, USA. NR 12 TC 12 Z9 12 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD MAY PY 1994 VL 32 IS 5 BP 1006 EP 1012 DI 10.2514/3.12087 PG 7 WC Engineering, Aerospace SC Engineering GA NJ389 UT WOS:A1994NJ38900016 ER PT J AU OREBAUGH, SL BRADFORD, SM AF OREBAUGH, SL BRADFORD, SM TI INTRAVENOUS VERSUS INTRAMUSCULAR MIDAZOLAM IN TREATMENT OF CHEMICALLY-INDUCED GENERALIZED SEIZURES IN SWINE SO AMERICAN JOURNAL OF EMERGENCY MEDICINE LA English DT Article DE ANTICONVULSANT; INTRAMUSCULAR; INTRAVENOUS; MIDAZOLAM; SEIZURES; STATUS EPILEPTICUS RP OREBAUGH, SL (reprint author), USN,NAVAL MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0735-6757 J9 AM J EMERG MED JI Am. J. Emerg. Med. PD MAY PY 1994 VL 12 IS 3 BP 284 EP 287 DI 10.1016/0735-6757(94)90139-2 PG 4 WC Emergency Medicine SC Emergency Medicine GA NK944 UT WOS:A1994NK94400005 PM 8179731 ER PT J AU HORTON, S SEXTON, PJ CONRAD, KA KISER, WR AF HORTON, S SEXTON, PJ CONRAD, KA KISER, WR TI CARDIAC ENZYMES IN THE ED SO AMERICAN JOURNAL OF EMERGENCY MEDICINE LA English DT Letter RP HORTON, S (reprint author), USN HOSP,DEPT FAMILY PRACTICE,JACKSONVILLE,FL, USA. 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 0735-6757 J9 AM J EMERG MED JI Am. J. Emerg. Med. PD MAY PY 1994 VL 12 IS 3 BP 384 EP 384 DI 10.1016/0735-6757(94)90173-2 PG 1 WC Emergency Medicine SC Emergency Medicine GA NK944 UT WOS:A1994NK94400033 PM 8179758 ER PT J AU PARKER, GS TAMI, TA MADDOX, MR WILSON, JF AF PARKER, GS TAMI, TA MADDOX, MR WILSON, JF TI THE EFFECT OF WATER EXPOSURE AFTER TYMPANOSTOMY TUBE INSERTION SO AMERICAN JOURNAL OF OTOLARYNGOLOGY LA English DT Article RP PARKER, GS (reprint author), USN,MED CTR,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23708, USA. NR 0 TC 19 Z9 23 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0196-0709 J9 AM J OTOLARYNG JI Am. J. Otolaryngol. PD MAY-JUN PY 1994 VL 15 IS 3 BP 193 EP 196 DI 10.1016/0196-0709(94)90004-3 PG 4 WC Otorhinolaryngology SC Otorhinolaryngology GA NK472 UT WOS:A1994NK47200004 PM 8024107 ER PT J AU WAX, JR PRABHAKAR, G GIRALDEZ, RA HUTCHINS, GM STETTEN, G BLAKEMORE, KJ AF WAX, JR PRABHAKAR, G GIRALDEZ, RA HUTCHINS, GM STETTEN, G BLAKEMORE, KJ TI UNILATERAL RENAL HYPOPLASIA AND CONTRALATERAL RENAL AGENESIS - A NEW ASSOCIATION WITH 45,X/46,XY MOSAICISM SO AMERICAN JOURNAL OF PERINATOLOGY LA English DT Article AB The association of urinary anomalies with Turner's syndrome is well established. This report describes an unusual antenatal presentation of this cytogenetic disorder and the first reported case of unilateral renal hypoplasia and contralateral renal agenesis in a 45,X/46,XY fetus. The fetus presented with severe third trimester oligohydramnios and symmetrical intrauterine growth retardation at 29 weeks and 2 days' gestation. Chorionic villus cultures revealed a 45,X karyotype. A phenotypically male infant weighing 1833 g was delivered at 35 weeks and 2 days. Chromosomal analysis of the newborn showed a 45,X/46,XY mosaicism, and surgical exploration revealed absence of the left kidney and a hypoplastic right kidney. The infant died at 11 months of age from renal failure and peritonitis. This case demonstrates that monosomy X may be encountered in fetuses with marked growth delay and oligohydramnios. The etiology of the oligohydramnios in this case was a fetal renal malformation net previously described in Turner's syndrome. Antenatal cytogenetic findings should be confirmed postnatally, with a search for mosaicism, when monosomy X is encountered. RP WAX, JR (reprint author), USN HOSP,DEPT OBSTET GYNECOL,PORTSMOUTH,VA 23708, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU THIEME MEDICAL PUBL INC PI NEW YORK PA 381 PARK AVE SOUTH, NEW YORK, NY 10016 SN 0735-1631 J9 AM J PERINAT JI Am. J. Perinatol. PD MAY PY 1994 VL 11 IS 3 BP 184 EP 186 DI 10.1055/s-2008-1040741 PG 3 WC Obstetrics & Gynecology; Pediatrics SC Obstetrics & Gynecology; Pediatrics GA NL066 UT WOS:A1994NL06600002 PM 8048981 ER PT J AU FEIGIN, AM NINOMIYA, Y BEZRUKOV, SM BRYANT, BP MOORE, PA KOMAI, M WACHOWIAK, M TEETER, JH VODYANOY, I BRAND, JG AF FEIGIN, AM NINOMIYA, Y BEZRUKOV, SM BRYANT, BP MOORE, PA KOMAI, M WACHOWIAK, M TEETER, JH VODYANOY, I BRAND, JG TI ENHANCEMENT OF GUSTATORY NERVE-FIBERS TO NACL AND FORMATION OF ION CHANNELS BY COMMERCIAL NOVOBIOCIN SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Article DE SALT TASTE TRANSDUCTION; AMILORIDE ID ELECTRICAL TONGUE STIMULATIONS; CHORDA TYMPANI FIBERS; TASTE RECEPTOR-CELLS; AMILORIDE INHIBITION; NA+ CHANNEL; SALT TASTE; SODIUM; RESPONSES; ORGANIZATION; TRANSDUCTION AB Single fibers of the rat chorda tympani nerve were used to study the mechanism of action of the antibiotic novobiocin on salt taste transduction. In the rat, novobiocin selectively enhanced the responses of sodium-specific and amiloride-sensitive chorda tympani nerve fibers (N type) without affecting more broadly responsive cation-sensitive and amiloride-insensitive fibers (E type). In the presence of amiloride, novobiocin was ineffective at enhancing the response of N-type fibers toward sodium chloride. Novobiocin also increased the conductance of bilayers formed from neutral lipids by forming nonrectifying ion channels with low conductance (similar to 7 pS in 110 mM NaCl), long open times (several seconds and longer), and high cation selectivity. Amiloride did not alter either the conductance or kinetics of these novobiocin channels. These observations suggest that even though novobiocin is able to form cation channels in lipid bilayers, and possibly in cell membranes as well, its action on the salt-taste response is through modulation of existing amiloride-sensitive sodium channels. C1 DEPT VET AFFAIRS MED CTR,PHILADELPHIA,PA 19104. ASAHI UNIV,DEPT ORAL PHYSIOL,GIFU 50102,JAPAN. NIH,BETHESDA,MD 20892. ST PETERSBURG NUCL PHYS INST,ST PETERSBURG 188350,RUSSIA. OFF NAVAL RES,ARLINGTON,VA 22217. RP FEIGIN, AM (reprint author), UNIV PENN,MONELL CHEM SENSES CTR,3500 MARKET ST,PHILADELPHIA,PA 19104, USA. NR 33 TC 13 Z9 13 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD MAY PY 1994 VL 266 IS 5 BP C1165 EP C1172 PN 1 PG 8 WC Physiology SC Physiology GA NP995 UT WOS:A1994NP99500003 ER PT J AU REED, HL QUESADA, M HESSLINK, RL DALESANDRO, MM HAYS, MT CHRISTOPHERSON, RJ TURNER, BV YOUNG, BA AF REED, HL QUESADA, M HESSLINK, RL DALESANDRO, MM HAYS, MT CHRISTOPHERSON, RJ TURNER, BV YOUNG, BA TI CHANGES IN SERUM TRIIODOTHYRONINE KINETICS AND HEPATIC TYPE-I 5'-DEIODINASE ACTIVITY OF COLD-EXPOSED SWINE SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Article DE ADAPTATION; NONCOMPARTMENTAL METHODS ID BROWN ADIPOSE-TISSUE; THYROXINE 5'-DEIODINASE; THYROID-HORMONES; UNCOUPLING PROTEIN; YOUNG-PIG; METABOLISM; 3,5,3'-TRIIODOTHYRONINE; THERMOGENESIS; EXPOSURES; INVITRO AB Swine exposed to cold air have elevated serum values of total triiodothyronine (TT3) and free T-3 (FT3). To characterize the mechanism of these increases, we measured in vivo kinetic parameters after a bolus intravenous injection of I-125-labeled T-3 by use of both multicompartmental (MC) and noncompartmental (NC) methods and in vitro hepatic type I iodothyronine 5'-deiodinase (5'D-I) activity. Ten ad libitum-fed 5-mo-old boars were divided into two groups, living for 25 days in either control (22 degrees C) or cold (4 degrees C) conditions. Cold-exposed animals consumed 50% more calories than control animals but showed no difference in total body weight, percent body fat, or plasma volume. Thyroid gland weight was increased 86% (P < 0.004), as was serum total thyroxine (TT4) (48%), free T-4 (FT4) (61%), TT3 (103%), and FT3 (107%), whereas serum thyrotropin (TSH) was not different in cold-exposed compared with control animals. The T-3 plasma clearance rate was similar between groups when both MC and NC techniques were used. However, T-3 plasma appearance rate (PAR) was elevated in cold-treated animals 110% over controls by MC (P < 0.001) and 83% by NC methods (P < 0.001). The animal total hormone pool of T-3 was increased 76% (MC) and 53% (NC) compared with control (P < 0.01). The Michaelis constant of hepatic 5'D-I was not different between groups, but the maximum enzyme velocity increased (106%; P < 0.02). Therefore cold exposure for 25 days is associated with increased energy intake, thyroid size, T-3 PAR, and hepatic 5'D-I activity with little change in serum TSH. C1 MADIGAN ARMY MED CTR,DEPT MED,ENDOCRINE SERV,TACOMA,WA 98431. USN,MED RES INST,THERMAL STRESS ADAPTAT PROGRAM,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. VET AFFAIRS MED CTR,PALO ALTO,CA 94304. UNIV ALBERTA,DEPT ANIM SCI,EDMONTON T6G 2P5,AB,CANADA. NR 30 TC 8 Z9 8 U1 0 U2 1 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD MAY PY 1994 VL 266 IS 5 BP E786 EP E795 PN 1 PG 10 WC Physiology SC Physiology GA NP995 UT WOS:A1994NP99500051 PM 8203516 ER PT J AU BEIER, JC OSTER, CN ONYANGO, FK BALES, JD SHERWOOD, JA PERKINS, PV CHUMO, DK KOECH, DV WHITMIRE, RE ROBERTS, CR DIGGS, CL HOFFMAN, SL AF BEIER, JC OSTER, CN ONYANGO, FK BALES, JD SHERWOOD, JA PERKINS, PV CHUMO, DK KOECH, DV WHITMIRE, RE ROBERTS, CR DIGGS, CL HOFFMAN, SL TI PLASMODIUM-FALCIPARUM INCIDENCE RELATIVE TO ENTOMOLOGIC INOCULATION RATES AT A SITE PROPOSED FOR TESTING MALARIA VACCINES IN WESTERN KENYA SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID ANOPHELES-GAMBIAE COMPLEX; INFECTED ANOPHELES; KISUMU AREA; TRANSMISSION; SPOROZOITES; CULICIDAE; DIPTERA AB Relationships between Plasmodium falciparum incidence and entomologic inoculation rates (EIRs) were determined for a 21-month period in Saradidi, western Kenya, in preparation for malaria vaccine field trials. Children, ranging in age from six months to six years and treated to clear malaria parasites, were monitored daily for up to 12 weeks to detect new malaria infections. Overall, new P. falciparum infections were detected in 77% of 809 children. The percentage of children that developed infections per two-week period averaged 34.7%, ranging from 7.3% to 90.9%. Transmission by vector populations was detected in 86.4% (38 of 44) of the two-week periods, with daily EIRs averaging 0.75 infective bites per person. Periods of intense transmission during April to August, and from November to January, coincided with seasonal rains. Relationships between daily malaria attack rates and EIRs indicated that an average of only 7.5% (1 in 13) of the sporozoite inoculations produced new infections in children. Regression analysis demonstrated that EIRs accounted for 74% of the Variation in attack rates. One of the components of the EIR, the human-biting rate, alone accounted for 68% of the variation in attack rates. Thus, measurements of either the EIR or the human-biting rate can be used to predict corresponding attack rates in children. These baseline epidemiologic studies indicate that the intense transmission patterns of P. falciparum in Saradidi will provide excellent conditions for evaluating malaria vaccine efficacy. C1 KENYA GOVT MED RES CTR,NAIROBI,KENYA. USA,RESP MED UNIT,NAIROBI,KENYA. USN,MED RES INST,BETHESDA,MD. WALTER REED ARMY MED CTR,WALTER REED ARMY INST RES,DEPT ENTOMOL,WASHINGTON,DC 20307. RP BEIER, JC (reprint author), JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT IMMUNOL & INFECT DIS,615 N WOLFE ST,BALTIMORE,MD 21205, USA. FU NIAID NIH HHS [AI-29000] NR 30 TC 173 Z9 174 U1 1 U2 7 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 MAY PY 1994 VL 50 IS 5 BP 529 EP 536 PG 8 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA NR407 UT WOS:A1994NR40700001 PM 7911282 ER PT J AU WATERS, JH LEIVERS, D HULLANDER, M AF WATERS, JH LEIVERS, D HULLANDER, M TI RESPONSE TO SPINAL-ANESTHESIA AFTER INADEQUATE EPIDURAL-ANESTHESIA SO ANESTHESIA AND ANALGESIA LA English DT Letter ID CESAREAN-SECTION; BLOCK C1 USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP WATERS, JH (reprint author), USN,MED CTR,DEPT ANESTHESIOL,SAN DIEGO,CA 92134, USA. NR 4 TC 6 Z9 6 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 MAY PY 1994 VL 78 IS 5 BP 1033 EP 1034 PG 2 WC Anesthesiology SC Anesthesiology GA NJ087 UT WOS:A1994NJ08700042 PM 8192786 ER PT J AU REIF, TC JOHNS, M PILLAI, SD CARL, M AF REIF, TC JOHNS, M PILLAI, SD CARL, M TI IDENTIFICATION OF CAPSULE-FORMING BACILLUS-ANTHRACIS SPORES WITH THE PCR AND A NOVEL DUAL-PROBE HYBRIDIZATION FORMAT SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID SENSOR-BASED SYSTEM; QUANTITATION; PLASMID AB Anthrax is a fatal infection of humans and livestock that is caused by the gram-positive bacterium Bacillus anthracis. The virulent strains of B. anthracis are encapsulated and toxigenic. In this paper we describe the development of a PCR technique for identifying spores of B. anthracis. Two 20-mer oligonucleotide primers specific for the capB region of 60-MDa plasmid pX02 were used for amplification. The amplification products were detected by using biotin- and fluorescein-labeled probes in a novel dual-probe hybridization format. Using the combination of PCR amplification and dual-probe hybridization, we detected two copies of the bacterial genome. Because the PCR assay could detect a minimum of 100 unprocessed spores per PCR mixture, we attempted to facilitate the release of DNA by comparing the effect of limited spore germination with the effect of mechanical spore disruption prior to PCR amplification. The two methods were equally effective and allowed us to identify single spores of B. anthracis in PCR mixtures. C1 USN,NATL MED CTR,INST MED RES,ACCELERATED PROD DEV PROGRAM,BETHESDA,MD 20889. TEXAS A&M UNIV,RES CTR,EL PASO,TX 79927. NR 18 TC 48 Z9 53 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD MAY PY 1994 VL 60 IS 5 BP 1622 EP 1625 PG 4 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA NJ577 UT WOS:A1994NJ57700032 PM 8017940 ER PT J AU MENDEZ, C GUBLER, KD MAIER, RV AF MENDEZ, C GUBLER, KD MAIER, RV TI DIAGNOSTIC-ACCURACY OF PERITONEAL-LAVAGE IN PATIENTS WITH PELVIC FRACTURES SO ARCHIVES OF SURGERY LA English DT Article; Proceedings Paper CT 101st Scientific Session of the Western-Surgical-Association CY NOV 15, 1993 CL SEATTLE, WA SP W SURG ASSOC ID MANAGEMENT; HEMORRHAGE; MORTALITY AB Objective: To determine the accuracy of diagnostic peritoneal lavage (DPL) for the evaluation of intraabdominal injury in patients with a pelvic fracture as a result of blunt trauma. Design: Retrospective cohort analysis. Setting: Level 1 trauma center in metropolitan Seattle, Wash. Patients: Four hundred ninety-seven consecutive patients admitted with pelvic fractures following blunt trauma during a 60-month period. Outcome Measures: Positive results of DPL, defined by one of the following: an immediate aspiration of more than 10 mt of gross blood; a red blood cell count of more than 0.0001 X 10(12)/L; a white blood cell count greater than 0.0005 X 10(9)/L; an elevated amylase, bilirubin, or creatinine level; or organic particles or bacteria in the effluent returned after installation of 1 L of crystalloid fluid lavaged in the peritoneal cavity. Results: Two hundred eighty-six patients underwent DPL. For 80 patients (28.0%), results of DPL were positive and for 194 patients (67.8%) the results of DPL were negative. For two patients (0.7%), results of DPL were false positive for a sensitivity of 94%. For another two patients (0.7%), the results of DPL were false negative for a specificity of 99%. As a diagnostic modality, DPL has a positive predictive value of 98% and a negative predictive value of 97%. Conclusions: Diagnostic peritoneal lavage is a reliable method for the evaluation of intra-abdominal injury and should remain a standard component in the evaluation of patients following blunt injury with or without pelvic fractures. C1 UNIV WASHINGTON,SCH MED,DEPT SURG,SEATTLE,WA 98195. USN HOSP,DEPT SURG,SAN DIEGO,CA 92134. HARBORVIEW INJURY PREVENT & RES CTR,SEATTLE,WA. NR 13 TC 9 Z9 9 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0004-0010 J9 ARCH SURG-CHICAGO JI Arch. Surg. PD MAY PY 1994 VL 129 IS 5 BP 477 EP 481 PG 5 WC Surgery SC Surgery GA NK813 UT WOS:A1994NK81300003 PM 8185468 ER PT J AU LOONEY, RE AF LOONEY, RE TI BUDGETARY DILEMMAS IN PAKISTAN - COSTS AND BENEFITS OF SUSTAINED DEFENSE EXPENDITURES SO ASIAN SURVEY LA English DT Article RP LOONEY, RE (reprint author), USN,FORSCHUNGSZENTRUM,MONTEREY,CA 93940, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU UNIV CALIF PRESS PI BERKELEY PA JOURNALS DEPT 2120 BERKELEY WAY, BERKELEY, CA 94720 SN 0004-4687 J9 ASIAN SURV JI Asian Surv. PD MAY PY 1994 VL 34 IS 5 BP 417 EP 429 DI 10.1525/as.1994.34.5.00p0390k PG 13 WC Area Studies SC Area Studies GA NV839 UT WOS:A1994NV83900002 ER PT J AU HUMMEL, CA ARMSTRONG, JT QUIRRENBACH, A BUSCHER, DF MOZURKEWICH, D ELIAS, NM WILSON, RE AF HUMMEL, CA ARMSTRONG, JT QUIRRENBACH, A BUSCHER, DF MOZURKEWICH, D ELIAS, NM WILSON, RE TI VERY HIGH-PRECISION ORBIT OF CAPELLA BY LONG-BASE-LINE INTERFEROMETRY SO ASTRONOMICAL JOURNAL LA English DT Article ID MICHELSON INTERFEROMETRY; SPECTRAL TYPES; STARS; BINARY; STELLAR; PHOTOMETRY; ABUNDANCES; EVOLUTION; COMPONENT; COLORS AB The orbital elements of the double-lined spectroscopic binary Capella have been determined with unprecedented accuracy from observations with the Mark III optical interferometer. We have measured a magnitude difference, m(Aa)-m(Ab), of -0.05m +/- 0.05m, 0.15m +/- 0.05m, and 0.28m +/- 0.10m at lambdalambda800, 550, and 450 nm, respectively. We confirm previous observations that the more massive spectroscopic primary component Aa is also the cooler and visually fainter of the two stars. Measured stellar radii are R(Aa) = (12.2 +/- 0.2)R. and R(Ab) = (9.2 +/- 0.4)R.. There is some evidence in our data for a departure of the brightness distribution of component Ab from a simple limb-darkened disk, possibly related to star spots. Using spectroscopy by Barlow et al. [PASP, 105, 476 (1993)], we derive component masses of M(Aa) = (2.69 +/- 0.06) M. and M(Ab) = (2.56 +/- 0.04) M.. Comparison with recent stellar evolution models (Schaerer et al. 1993, A&AS, 98, 523) yields a stellar age of 5.25 x 10(8) yr for a metallicity of Z = 0.008. In this scenario, component Aa has undergone helium ignition. C1 USN OBSERV, NRL, OPT INTERFEROMETER PROJECT, WASHINGTON, DC 20390 USA. UNIV FLORIDA, DEPT ASTRON, GAINESVILLE, FL 32611 USA. NR 49 TC 74 Z9 74 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-6256 EI 1538-3881 J9 ASTRON J JI Astron. J. PD MAY PY 1994 VL 107 IS 5 BP 1859 EP 1867 DI 10.1086/116995 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NJ373 UT WOS:A1994NJ37300025 ER PT J AU QUIRRENBACH, A MOZURKEWICH, D HUMMEL, CA BUSCHER, DF ARMSTRONG, JT AF QUIRRENBACH, A MOZURKEWICH, D HUMMEL, CA BUSCHER, DF ARMSTRONG, JT TI ANGULAR DIAMETERS OF THE CARBON STARS UU-AURIGAE, Y-CANUM-VENATICORUM, AND TX-PISCIUM FROM OPTICAL LONG-BASE-LINE INTERFEROMETRY SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE TECHNIQUES, INTERFEROMETRIC; STARS, CARBON; STARS, FUNDAMENTAL PARAMETERS; UU-AUR; Y-CVN; TX PSC ID LUNAR OCCULTATION TECHNIQUE; EFFECTIVE TEMPERATURES; COOLER AB The angular diameters of the three carbon stars UU Aur, YCVn, and TX Psc have been determined with the MkIII Optical Interferometer. Measurements of UU Aur at lambdalambda = 712, 754, and 800 nm agree well with each other; the weighted mean for the uniform disk diameter is theta(UD) = 11.28 +/- 0.21 mas. For Y CVn, theta(UD) = 13.81 +/- 0.43 mas is obtained at 800 nm. There are indications of temporal variations of the diameter of TX Psc; values between 9.4 and 11.1 mas were measured for this star. Effective temperatures are calculated for these three stars and for six other carbon stars for which diameters measured with the lunar occultation technique have been published. These fundamentally determined effective temperatures correlate well with, but are on average about 100 K cooler than, effective temperatures for the same stars obtained with the infrared flux method by Tsuji (1981). Color temperatures determined by Baumert (1972) and by Gow (1977) correlate poorly with effective temperatures. C1 USN OBSERV, NRL USNO OPT INTERFEROMETER PROJECT, WASHINGTON, DC 20392 USA. UNIV SPACE RES ASSOC, WASHINGTON, DC 20024 USA. USN, RES LAB, DIV REMOTE SENSING, WASHINGTON, DC 20375 USA. NR 32 TC 23 Z9 23 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 MAY PY 1994 VL 285 IS 2 BP 541 EP 546 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NM403 UT WOS:A1994NM40300026 ER PT J AU LAMING, JM FELDMAN, U AF LAMING, JM FELDMAN, U TI THE SOLAR ABUNDANCE OF HELIUM DETERMINED FROM A REDSHIFTED PLASMA-FLOW OVER A SUNSPOT SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ABUNDANCES; SUN, UV RADIATION; SUNSPOTS ID ELECTRON-IMPACT EXCITATION; LINE RATIOS; SI-III; O-III; ATMOSPHERE; TRANSITIONS; FORBIDDEN; EMISSION; REGION; MODEL AB The ultraviolet spectrum of a redshifted plasma flow appearing over a sunspot in data obtained during the NRL HRTS I flight is intepreted as a radiatively cooling plasma. For most lines emitted from this plasma, the assumption of ionization equilibrium during the cooling is good; however, for He II this is not the case. In order to get the helium abundance by comparison with other lines, one must integrate differential equations for the various He ionization fractions, and the temperature, and then calculate the radiation emitted. Our result for the solar helium abundance is in the range 0.078-0.22 relative to hydrogen, with the uncertainty arising from lack of knowledge of model parameters. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP LAMING, JM (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 33 TC 11 Z9 12 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 MAY 1 PY 1994 VL 426 IS 1 BP 414 EP 424 DI 10.1086/174077 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NG668 UT WOS:A1994NG66800044 ER PT J AU SKIBO, JG DERMER, CD KINZER, RL AF SKIBO, JG DERMER, CD KINZER, RL TI IS THE HIGH-ENERGY EMISSION FROM CENTAURUS A COMPTON-SCATTERED JET RADIATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ACTIVE; GALAXIES, INDIVIDUAL (CENTAURUS-A); GALAXIES, JETS; GAMMA-RAYS, THEORY; POLARIZATION; RADIATION MECHANISMS, NONTHERMAL ID EXTRAGALACTIC RADIO-SOURCES AB We consider whether the hard X-ray and soft gamma-ray emission from Centaurus A is beamed radiation from the active nucleus that is Compton-scattered into our line of sight. We derive the spectrum and degree of polarization of scattered radiation when incident beamed radiation is scattered from a cold (kT much less than m(e)c2) electron cloud moving with bulk relativistic motion along the jet axis, and calculate results for an unpolarized, highly beamed incident power-law photon source. We fit the OSSE data from Centaurus A with this model and find that if the scatterers are not moving relativistically, then the angle the jet makes with respect to our line of sight is 61-degrees + 5-degrees. We predict a high degree of polarization of the scattered radiation below approximately 300 keV. Future measurements with X-ray and gamma-ray polarimeters could be used to constrain or rule out such a scenario. RP SKIBO, JG (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7650,WASHINGTON,DC 20375, USA. NR 26 TC 33 Z9 33 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 MAY 1 PY 1994 VL 426 IS 1 BP L23 EP L26 DI 10.1086/187330 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NG669 UT WOS:A1994NG66900006 ER PT J AU BOWERS, PF JOHNSTON, KJ AF BOWERS, PF JOHNSTON, KJ TI VLA POSITIONS AND DISTRIBUTIONS OF H2O MASERS ASSOCIATED WITH 15 MIRA AND SEMIREGULAR VARIABLES SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article ID LATE-TYPE STARS; OH-IR STARS; CIRCUMSTELLAR DUST SHELLS; OPTICAL REFERENCE FRAME; RADIO-SOURCE POSITIONS; MASS-LOSS RATES; EVOLVED STARS; U-ORIONIS; PLANETARY-NEBULAE; WATER MASERS AB Results of VLA observations of 22 GHz H2O masers associated with 15 Mira and semiregular variables are reported. The combination' of angular resolution (almost-equal-to 70 mas), spectral resolution (0.3 km s-1), rms sensitivity (+/-35 mJy beam-1), and hour-angle coverage is the best yet obtained for H2O Masers from a significant sample of stars. Comparison of accurate optical positions of the stars with estimates from the masers yields total differences typically less-than-or-equal-to 0.15''-an improvement over previous comparisons by a factor of about 2. The homogeneous, high-quality data set provides several new insights into the time-varying structure of circumstellar H2O profiles and angular distributions. Profile structures can exhibit dramatic, short-term (less than 1 yr) changes but also may exhibit stability of features over timescales up to 15 yr after allowance for phase-dependent effects. For this sample of stars (rates of mass loss from about 10(-7) to 10(-6) M. yr-1), the average profile shape shows strongest emission generally within +/-2 km s-1 of the stellar velocity V0, regardless of the stellar light-curve phase phi, but there is a higher probability of detecting multiple (particularly blueshifted) features and a larger velocity range (V0 +/- 9 km s-1) at 0.2 less-than-or-equal-to phi less-than-or-equal-to 0.4, when the integrated H2O luminosity is largest. Based on observations of different stars and on repeated VLA observations of specific stars, the shell size may vary typically by about a factor less-than-or-equal-to 2 during the light cycle, with statistically largest radius [rho] almost-equal-to 25 AU) at 0.2 less-than-or-equal-to phi less-than-or-equal-to 0.4. The morphology of the angular distribution can change strongly with phi, but similar morphologies are sometimes observed at comparable phases of different light curves, indicating that short-term changes (less than a few years) are likely to reflect changes in the pumping conditions. The shell radii range from greater-than-or-equal-to 5 to about 50 AU, and the region of maximal H2O intensity at a given epoch appears to occur over a radial interval less than or equal to one-third of the shell radius. The angular distributions at a given epoch frequently are elongated and sometimes are strongly asymmetric relative to the estimated stellar position. For three stars (RT Vir, U Her, UX Cyg), thin, asymmetric loop structures are found. For U Ori, strongest components near V0 are confined northeast and southwest of the star, suggestive of axial symmetry. Comparison of OH and H2O distributions shows points of similarity for several stars. Plots of shell radius as a function of radial velocity exhibit two forms of curves: singly peaked curves, where the radius increases rapidly within a few kilometers per second of V0, and doubly peaked curves, where the maximum radius occurs at velocities symmetric to but displaced from V0. The latter type of curve also tends to be double-valued (X-shaped) with two distinct map maxima at a given velocity over significant velocity intervals. There are indications of some combination of nonuniformities in the density distribution, deviations from sphericity, and anisotropies in the velocity field, but it is difficult to disentangle the effects of these phenomena and achieve unique interpretation. A plausible model is clumps or filaments distributed at radii which vary with direction from the star. From the angular distributions and velocity ranges, there is good evidence that at least some parcels of gas are accelerated to the terminal outflow velocity at rho greater-than-or-equal-to 20 AU and that there is a component of outflow at rho almost-equal-to 10-15 AU; some gas probably is fully accelerated at radii less than 10 AU. To illustrate the problems of interpretation, the well-known case of VX Sgr is reexamined. The data do not support a simple model of increasing outflow velocity with increasing maser shell radius. It is proposed that the outflow is weakly bipolar. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. RP BOWERS, PF (reprint author), SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 95 TC 62 Z9 63 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD MAY PY 1994 VL 92 IS 1 BP 189 EP 218 DI 10.1086/191966 PG 30 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF993 UT WOS:A1994NF99300010 ER PT J AU REID, JS FLOCCHINI, RG CAHILL, TA RUTH, RS AF REID, JS FLOCCHINI, RG CAHILL, TA RUTH, RS TI LOCAL METEOROLOGICAL, TRANSPORT, AND SOURCE AEROSOL CHARACTERISTICS OF LATE AUTUMN OWENS LAKE (DRY) DUST STORMS SO ATMOSPHERIC ENVIRONMENT LA English DT Article DE OWENS LAKE; AEROSOL; PM(10); PARTICULATE TRANSPORT; SALTATION ID DISTRIBUTIONS AB The time evolution of aerosol generation in the saltation dominated fine particle production from Owens (dry) Lake, California, was measured by size and elemental composition for four dust events in November-December 1991. Time resolved aerosol size distributions were measured during all storm periods from genesis to cessation at the township of Keeler, less than 1 km from the border of one of the dust-producing regions. The size distributions of aerosols showed a much greater concentration of soil elements in very fine modes than is usual in typical soils, with a PM10 mass median diameter in the 2.5-5 mum size range. Four meteorological stations on and around the lake, time lapse photography of the northern lake bed, and nephelometers located 100 km to the south allowed for the continuous monitoring of local meteorology as well as transport patterns during storm periods. Local meteorological and transport patterns observed are discussed. C1 USN,AIR WEAPONS STN,CHINA LAKE,CA 93555. RP REID, JS (reprint author), UNIV CALIF DAVIS,CROCKER NUCL LAB,DAVIS,CA 95616, USA. RI Reid, Jeffrey/B-7633-2014 OI Reid, Jeffrey/0000-0002-5147-7955 NR 14 TC 30 Z9 31 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 1352-2310 J9 ATMOS ENVIRON JI Atmos. Environ. PD MAY PY 1994 VL 28 IS 9 BP 1699 EP 1706 DI 10.1016/1352-2310(94)90315-8 PG 8 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NR413 UT WOS:A1994NR41300013 ER PT J AU CRAIGER, JP COOVERT, MD AF CRAIGER, JP COOVERT, MD TI A FUZZY SYSTEM FOR MAPPING WORKER ATTRIBUTES TO TASKS SO BEHAVIOR RESEARCH METHODS INSTRUMENTS & COMPUTERS LA English DT Article AB We developed a prototype of a rule-based expert system that facilitates a mapping from tasks comprising a job to the knowledge, skills, and abilities (KSAs) ostensibly required to perform the tasks. A variant of fuzzy logic was employed in the inference process. Signal detection theory was used to evaluate the performance of the system. The results indicated that the system performed well in terms of its ability to discriminate between the KSAs that are required of a task and those that are not. The discussion focuses on implications of the system and its use as an intelligent assistant in human resources planning. RP CRAIGER, JP (reprint author), USN,DEPT ORG SYST,53335 RYNE RD,SAN DIEGO,CA 92152, USA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0743-3808 J9 BEHAV RES METH INSTR JI Behav. Res. Methods Instr. Comput. PD MAY PY 1994 VL 26 IS 2 BP 107 EP 111 DI 10.3758/BF03204601 PG 5 WC Psychology, Mathematical; Psychology, Experimental SC Psychology GA NK980 UT WOS:A1994NK98000005 ER PT J AU COFFEY, SL DEPRIT, A DEPRIT, E AF COFFEY, SL DEPRIT, A DEPRIT, E TI FROZEN ORBITS FOR SATELLITES CLOSE TO AN EARTH-LIKE SO CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY LA English DT Article DE HAMILTONIAN SYSTEMS; ARTIFICIAL SATELLITE THEORY; CRITICAL INCLINATION; FROZEN ORBITS AB We say that a planet is Earth-like if the coefficient of the second order zonal harmonic dominates all other coefficients in.the gravity field. This paper concerns the zonal problem for satellites around an Earth-like planet, all other perturbations excluded. The potential contains all zonal coefficients J2 through J9. The model problem is averaged-over the mean anomaly by a Lie transformation to the second order; we produce the resulting Hamiltonian as a Fourier series in the argument of perigee whose coefficients are algebraic functions of the eccentricity - not truncated power series. We then proceed to a global exploration of the equilibria in the averaged problem. These singularities which aerospace engineers know by the name of frozen orbits are located by solving the equilibria equations in two ways, (1) analytically in the neighborhood of either the zero eccentricity or the critical inclination, and (2) numerically by a Newton-Raphson iteration applied to an approximate position read from the color map of the phase flow. The analytical solutions we supply in full to assist space engineers in designing survey missions. We pay special attention to the manner in which additional zonal coefficients affect the evolution of bifurcations we had traced earlier in the main problem (J2 only). In particular, we examine the manner in which the odd zonal J3 breaks the discrete symmetry inherent to the even zonal problem. In the even case, we find that Vinti's problem (J4 + J2(2) = 0) presents a degeneracy in the form of non-isolated equilibria; we surmise that the degeneracy is a reflection of the fact that Vinti's problem is separable. By numerical continuation we have discovered three families of frozen orbits in the full zonal problem under consideration; (1) a family of stable equilibria starting from the equatorial plane and tending to the critical inclination; (2) an unstable family arising from the bifurcation at the critical inclination; (3) a stable family also arising from that bifurcation and terminating with a polar orbit. Except in the neighborhood of the critical inclination, orbits in the stable families have very small eccentricities, and are thus well suited for survey missions. RP COFFEY, SL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 80 Z9 80 U1 0 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0923-2958 J9 CELEST MECH DYN ASTR JI Celest. Mech. Dyn. Astron. PD MAY PY 1994 VL 59 IS 1 BP 37 EP 72 DI 10.1007/BF00691970 PG 36 WC Astronomy & Astrophysics; Mathematics, Interdisciplinary Applications SC Astronomy & Astrophysics; Mathematics GA NR872 UT WOS:A1994NR87200002 ER PT J AU ISHIDA, Y CHUSED, TM MURAKAMI, S ABE, R AF ISHIDA, Y CHUSED, TM MURAKAMI, S ABE, R TI ANTIGEN-SPECIFIC CELL CONJUGATE FORMATION AND LONG-LASTING CALCIUM RESPONSES IN RECOGNITION OF MLS CELLULAR SUPERANTIGEN BY CLONED MURINE T-LYMPHOCYTES SO CELLULAR IMMUNOLOGY LA English DT Article ID MONOCLONAL-ANTIBODY GK1.5; SIGNAL TRANSDUCTION; PHYSICAL ASSOCIATION; IMMATURE THYMOCYTES; NEGATIVE SELECTION; TYROSINE KINASE; SELF-TOLERANCE; EARLY STEPS; RECEPTOR; ACTIVATION AB T lymphocyte recognition of cell-associated minor lymphocyte stimulation (Mls) superantigen was studied by simultaneous flow cytometric measurement of T cell free ionized intracellular calcium ([Ca2+](i)) with the fluorescent probe indo-1 and T cell binding to antigen-presenting cells stained with a long-chained, membrane-fixed cyanine dye. Cloned T cell-B lymphocyte antigen-presenting cell conjugate formation and increased T cell [Ca2+](i) were antigen specific and tightly linked in four Mis-reactive T cell clones. The T cell-antigen-presenting cell conjugates were extremely stable and, like T cell [Ca2+](i) elevation, were maintained for more than 2 hr. Three ligand-receptor pairs, (i)T cell receptor/antigen + class II, (ii) CD4/class II, and (iii) LFA-1/ICAM-1, were obligatory participants in T cell recognition of cell-bound superantigen since monoclonal antibodies to any of them blocked formation of cell conjugates. Despite previous reports, Mis recognition occurred by the conventional T cell recognition pathway with easily detected phosphoinositide hydrolysis. B cell activation greatly enhances their recognition by Mls-specific T cells. (C) 1994 Academic Press, Inc. C1 NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. RP ISHIDA, Y (reprint author), NIAID,IMMUNOL LAB,ROCKVILLE,MD 20852, USA. NR 64 TC 3 Z9 3 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0008-8749 J9 CELL IMMUNOL JI Cell. Immunol. PD MAY PY 1994 VL 155 IS 2 BP 414 EP 427 DI 10.1006/cimm.1994.1134 PG 14 WC Cell Biology; Immunology SC Cell Biology; Immunology GA NL799 UT WOS:A1994NL79900014 PM 7910116 ER PT J AU HUESTIS, MA MITCHELL, JM CONE, EJ AF HUESTIS, MA MITCHELL, JM CONE, EJ TI LOWERING THE FEDERALLY MANDATED CANNABINOID IMMUNOASSAY CUTOFF INCREASES TRUE-POSITIVE RESULTS SO CLINICAL CHEMISTRY LA English DT Article DE DRUGS OF ABUSE; MARIJUANA; GAS CHROMATOGRAPHY; MASS SPECTROMETRY; INTERMETHOD COMPARISON; URINE SCREENING ID CHROMATOGRAPHY-MASS-SPECTROMETRY; GAS-CHROMATOGRAPHY; URINE; DELTA-9-TETRAHYDROCANNABINOL; CONFIRMATION; METABOLITES; THRESHOLD; ASSAY; ACID; EMIT AB Proposed changes to the Health and Human Services Guidelines for forensic urine drug testing will lower the required cannabinoid immunoassay cutoff concentration from 100 to 50 mu g/L. We investigated the effect of this change on the sensitivity, specificity, and efficiency of eight cannabinoid immunoassays: Syva Emit(R) d.a.u.(TM) 100; Syva Emit II 100; Syva Emit d.a.u. 50; Syva Emit II 50; Roche Abuscreen(R) Online(TM); Roche Abuscreen radioimmunoassay; Diagnostic Reagents(R); and Abbott ADx(R). All specimens also were assayed by gas chromatography/mass spectrometry. Lowering the cutoff concentration from 100 to 50 mu g/L increased efficiencies and sensitivities for all immunoassays, with minor decreases in specificity (1.0-2.6%). There was a 23.2-53.6% increase in the number of true-positive specimens identified. Thus, lowering the cannabinoid immunoassay cutoff concentration from 100 to 50 mu g/L resulted in detection of a substantial number of additional true-positive specimens, with an accompanying small increase in unconfirmed positive results. C1 NIDA,ADDICT RES CTR,CHEM & DRUG METAB SECT,BALTIMORE,MD 21224. USN,DRUG SCREENING LAB,NAVAL AIR STN,JACKSONVILLE,FL 32212. NR 17 TC 20 Z9 22 U1 1 U2 2 PU AMER ASSOC CLINICAL CHEMISTRY PI WASHINGTON PA 2101 L STREET NW, SUITE 202, WASHINGTON, DC 20037-1526 SN 0009-9147 J9 CLIN CHEM JI Clin. Chem. PD MAY PY 1994 VL 40 IS 5 BP 729 EP 733 PG 5 WC Medical Laboratory Technology SC Medical Laboratory Technology GA NK828 UT WOS:A1994NK82800009 PM 8174244 ER PT J AU ANDERSON, MD KENNEDY, CA LEWIS, AW CHRISTENSEN, GR AF ANDERSON, MD KENNEDY, CA LEWIS, AW CHRISTENSEN, GR TI RETROBULBAR NEURITIS COMPLICATING ACUTE EPSTEIN-BARR-VIRUS INFECTION SO CLINICAL INFECTIOUS DISEASES LA English DT Note ID OPTIC NEURITIS AB A 19-year-old man presented with retrobulbar neuritis and was initially suspected to have neurosyphilis because of a positive microhemagglutination assay for Treponema pallidum (MHA-TP). However, a Venereal Disease Research Laboratory assay was negative, and the patient was subsequently diagnosed with infection due to Epstein-Barr virus (EBV) by heterophile antibody assay and serology for EBV. A biological false-positive MHA-TP has been reported in association with EBV infection. Physicians need to be aware that both retrobulbar neuritis and a biological false-positive MHA-TP can be seen in association with EBV infection. C1 USN,MED CTR,DEPT INTERNAL MED INFECT DIS,SAN DIEGO,CA 92152. USN,MED CTR,DEPT OPHTHALMOL,SAN DIEGO,CA 92152. LEXINGTON CLIN,LEXINGTON,KY. NR 16 TC 10 Z9 10 U1 0 U2 1 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 MAY PY 1994 VL 18 IS 5 BP 799 EP 801 PG 3 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA NL167 UT WOS:A1994NL16700020 PM 8075274 ER PT J AU NEWTON, JA LESNIK, IK KENNEDY, CA AF NEWTON, JA LESNIK, IK KENNEDY, CA TI STREPTOCOCCUS-SALIVARIUS MENINGITIS FOLLOWING SPINAL-ANESTHESIA SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 USN,MED CTR,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92152. USN,MED CTR,DEPT ANESTHESIOL,SAN DIEGO,CA 92152. RP NEWTON, JA (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 8 TC 29 Z9 29 U1 0 U2 1 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 MAY PY 1994 VL 18 IS 5 BP 840 EP 841 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA NL167 UT WOS:A1994NL16700039 PM 8075292 ER PT J AU NEWTON, JA WALLACE, MR AF NEWTON, JA WALLACE, MR TI NODULAR LYMPHADENITIS CAUSED BY NOCARDIA-BRASILIENSIS SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 USN,MED CTR,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92152. RP NEWTON, JA (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 5 TC 2 Z9 2 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 MAY PY 1994 VL 18 IS 5 BP 843 EP 843 PG 1 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA NL167 UT WOS:A1994NL16700042 PM 8075295 ER PT J AU KUMMER, M SAENZ, AW AF KUMMER, M SAENZ, AW TI NONINTEGRABILITY OF THE CLASSICAL ZEEMAN HAMILTONIAN SO COMMUNICATIONS IN MATHEMATICAL PHYSICS LA English DT Article ID NON-INTEGRABILITY; HYDROGEN-ATOM; SYSTEMS; EXISTENCE; CRITERION; MOTION; FIELD AB We prove that the Hamiltonian H of the three dimensional hydrogen atom in a uniform static magnetic field B does not have an integral which (i) is real analytic on the phase space ff of the system; (ii) is in involution with the component M3 of the angular momentum along B; (iii) is functionally independent of H and M3 and (iv) has a meromorphic (single-valued) extension to the complexification of M in C6. This follows from the fact that the Hamiltonian K(M) of two degrees of freedom obtained by fixing M3 at certain nonzero values M and reducing H w.r. to the rotational symmetry about the magnetic field, has a complexification which is nonintegrable in the Ziglin sense. We prove this nonintegrability by demonstrating that for each such M the monodromy group of the normal variational equation along a certain complexified phase curve of K(M) is not Ziglin, using Churchill and Rod's adaptation of Kovacic's algorithm to the Ziglin analysis. Analogous arguments prove that the Hamiltonian of the Stormer problem is nonintegrable in the same sense. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. CATHOLIC UNIV, DEPT PHYS, WASHINGTON, DC 20064 USA. RP UNIV TOLEDO, DEPT MATH, TOLEDO, OH 43606 USA. NR 32 TC 8 Z9 8 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0010-3616 EI 1432-0916 J9 COMMUN MATH PHYS JI Commun. Math. Phys. PD MAY PY 1994 VL 162 IS 3 BP 447 EP 465 DI 10.1007/BF02101742 PG 19 WC Physics, Mathematical SC Physics GA NR387 UT WOS:A1994NR38700002 ER PT J AU GONZALEZ, TF RAZZAZI, M SHING, MT ZHENG, SQ AF GONZALEZ, TF RAZZAZI, M SHING, MT ZHENG, SQ TI ON OPTIMAL GUILLOTINE PARTITIONS APPROXIMATING OPTIMAL D-BOX PARTITIONS SO COMPUTATIONAL GEOMETRY-THEORY AND APPLICATIONS LA English DT Article DE APPROXIMATION ALGORITHMS; D-BOX PARTITIONS; POLYNOMIAL TIME COMPLEXITY; GUILLOTINE PARTITIONS, COMPUTATIONAL GEOMETRY AB Given a set of n points, P, in E(d)(the plane when d = 2) that lie inside a d-box (rectangle when d = 2) R, we study the problem of partitioning R into d-boxes by introducing a set of orthogonal hyperplane segments (line segments when d = 2) whose total (d - 1)-volume (length when d = 2) is the least possible. In a valid d-box partition, each point in P must be included in at least one partitioning orthogonal hyperplane segment. Since this minimization problem is NP-hard and thus likely to be computationally intractable, we present an approximation algorithm to generate a suboptimal solution. This solution is obtained by finding an optimal guillotine partition, i.e., a special type of rectangular partition, which can be generated in O(dn2d+1) time. We present a simple proof that the (d - 1)-volume of an optimal guillotine partition is not greater than 2d - 4 + 4/d times the (d - 1)-volume of an optimal d-box partition. C1 UNIV CALIF SANTA BARBARA,DEPT COMP SCI,SANTA BARBARA,CA 93106. NAVAL POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. LOUISIANA STATE UNIV,DEPT COMP SCI,BATON ROUGE,LA 70803. NR 13 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-7721 J9 COMP GEOM-THEOR APPL JI Comput. Geom.-Theory Appl. PD MAY PY 1994 VL 4 IS 1 BP 1 EP 11 DI 10.1016/0925-7721(94)90013-2 PG 11 WC Mathematics, Applied; Mathematics SC Mathematics GA NP178 UT WOS:A1994NP17800001 ER PT J AU LEWIS, T AF LEWIS, T TI PLUGGING INTO THE FUTURE, TODAY SO COMPUTER LA English DT Editorial Material RP LEWIS, T (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 92943, 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 MAY PY 1994 VL 27 IS 5 BP 6 EP 7 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA NL400 UT WOS:A1994NL40000001 ER PT J AU GARFIELD, N RAGO, TA SCHNEBELE, KJ COLLINS, CA AF GARFIELD, N RAGO, TA SCHNEBELE, KJ COLLINS, CA TI EVIDENCE OF A TURBIDITY-CURRENT IN MONTEREY SUBMARINE-CANYON ASSOCIATED WITH THE 1989 LOMA-PRIETA EARTHQUAKE SO CONTINENTAL SHELF RESEARCH LA English DT Article AB Evidence of a turbidity current sweeping through the Monterey Submarine Canyon following the October 1989 Loma Prieta earthquake was documented by the movement of bottom-deployed acoustic transponders used to navigate free-falling oceanographic instrumentation. Measuring sites located along the Cayon at distances of 55, 130 and 190 km from the Cayon head off Moss Landing, CA, all showed evidence of tectonically induced sediment transport. At the site 55 km from the Canyon head, one transponder, located in the axis of the Canyon, was carried 1.9 km down the axis and was deposited among a field of rocks. The other three transponders had been deployed on the sides of the canyon and showed evidence of sediment slumping toward the Canyon axis. Circumstantial evidence from the site 130 km down the canyon suggests that sediment deposition occurred outside the channel axis. Sediment slumping or erosional cutting moved one transponder deeper at the site 190 km from the canyon head. RP GARFIELD, N (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93940, USA. NR 21 TC 33 Z9 34 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0278-4343 J9 CONT SHELF RES JI Cont. Shelf Res. PD MAY PY 1994 VL 14 IS 6 BP 673 EP 686 DI 10.1016/0278-4343(94)90112-0 PG 14 WC Oceanography SC Oceanography GA NF432 UT WOS:A1994NF43200006 ER PT J AU HAZLETT, RN HARDY, DR MALHOTRA, R AF HAZLETT, RN HARDY, DR MALHOTRA, R TI EXAMINATION OF MIDDLE DISTILLATE FUEL INSOLUBLES BY PYROLYSIS FIELD-IONIZATION MASS-SPECTROMETRY SO ENERGY & FUELS LA English DT Article ID STORAGE STABILITY; DIESEL FUEL; SEDIMENT FORMATION; IDENTIFICATION AB Solids isolated from several different diesel fuels under a variety of conditions of ageing were analyzed in detail by pyrolysis/field ionization mass spectrometry. Using this technique, it was found that filterable and adherent solids appeared to be of similar composition, whereas filterable solids from different fuels appeared to be distinctly different. The effect of ageing the fuels at ambient and under ASTM D5304 conditions resulted in compositionally similar insolubles. A sulfonic acid or a thiophenol added to the fuels tended to produce a filterable insoluble which was compositionally very different from the additive free fuels. The spectra indicate possible involvement of indoles and phenalenes in the higher molecular weight pyrolyzates. C1 USN,RES LAB,NAVY TECHNOL CTR SAFETY & SURVIVABIL,WASHINGTON,DC 20375. SRI INT,MENLO PK,CA 94025. RP HAZLETT, RN (reprint author), HUGHES ASSOCIATES,6770 OAK HALL LANE,COLUMBOIA,MD 21045, USA. OI Malhotra, Ripudaman/0000-0003-0808-8177 NR 22 TC 4 Z9 5 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAY-JUN PY 1994 VL 8 IS 3 BP 774 EP 781 DI 10.1021/ef00045a035 PG 8 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA NN798 UT WOS:A1994NN79800036 ER PT J AU HARDY, DR WECHTER, MA AF HARDY, DR WECHTER, MA TI CHARACTERIZATION OF SOLUBLE MACROMOLECULAR OXIDATIVELY REACTIVE SPECIES (SMORS) FROM MIDDLE DISTILLATE DIELEL FUELS - THEIR ORIGIN AND ROLE IN INSTABILITY SO ENERGY & FUELS LA English DT Article ID INSOLUBLE SEDIMENT FORMATION; DIESEL FUEL; STORAGE STABILITY; ACIDITY AB Compositional characterization of a solid-phase material isolated by extraction from filtered liquid-phase diesel fuels is reported. This solid-phase material (SMORS) is shown to be the product of reactive fuel constituents and intermediate to the formation of fuel insoluble sludge. The composition of this material changes during blending processes and tends to become more oxygen-rich and thus more polar. Elemental analysis, average molecular weight, and pyrolysis mass spectral data are presented for SMORS from a number of representative blended fuels and their blending stocks. SMORS has been shown to be made up of oxidized trimers, tetramers and possibly higher n-mers of nitrogen-containing precursors originally present in the fuel. It is not possible to determine the SMORS precursors in field aged fuel (such as those in this study) since these precursors are essentially depleted from the fuel by the time very small amounts of SMORS have been formed. C1 UNIV MASSACHUSETTS,DEPT CHEM,N DARTMOUTH,MA 02747. RP HARDY, DR (reprint author), USN,RES LAB,NAVY TECHNOL CTR SAFETY & SURVIVABIL,CODE 6180,WASHINGTON,DC 20375, USA. NR 18 TC 19 Z9 21 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAY-JUN PY 1994 VL 8 IS 3 BP 782 EP 787 DI 10.1021/ef00045a036 PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA NN798 UT WOS:A1994NN79800037 ER PT J AU WARREN, GE MALVAR, LJ AF WARREN, GE MALVAR, LJ TI STRUCTURAL ASSESSMENT OF REINFORCED-CONCRETE PIERS USING THE IMPACT LOAD METHOD SO EXPERIMENTAL TECHNIQUES LA English DT Article C1 UNIV CALIF DAVIS,DEPT CIVIL ENGN,DAVIS,CA 95616. RP WARREN, GE (reprint author), USN,CIVIL ENGN LAB,PORT HUENEME,CA, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU SOC EXPERIMENTAL MECHANICS PI BETHEL PA 7 SCHOOL STREET, BETHEL, CT 06801 SN 0732-8818 J9 EXP TECHNIQUES JI Exp. Tech. PD MAY-JUN PY 1994 VL 18 IS 3 BP 15 EP 21 DI 10.1111/j.1747-1567.1994.tb00817.x PG 7 WC Engineering, Mechanical; Mechanics; Materials Science, Characterization & Testing SC Engineering; Mechanics; Materials Science GA NM897 UT WOS:A1994NM89700003 ER PT J AU VOGT, PR CRANE, K SUNDVOR, E AF VOGT, PR CRANE, K SUNDVOR, E TI DEEP PLEISTOCENE ICEBERG PLOWMARKS ON THE YERMAK PLATEAU - SIDESCAN AND 3.5 KHZ EVIDENCE FOR THICK CALVING ICE FRONTS AND A POSSIBLE MARINE ICE-SHEET IN THE ARCTIC-OCEAN SO GEOLOGY LA English DT Article AB The southern Yermak Plateau (northwest of Spitsbergen) was investigated with 11-12 kHz sidescan sonar and 3.5 kHz profiler to test whether thick Pleistocene ice streams ever calved into the Arctic Ocean and/or whether a continuous Arctic ice sheet existed. In either case, the ice would have grounded on the plateau crest on its way out of the Arctic. Several distinct sets of relict iceberg plowmarks were discovered at present water depths from less than 450 m to at least 850 m, perhaps recording the deepest iceberg keels known. The plateau crest (510-530 m) is nearly bare of plowmarks, perhaps because of beveling by an ice rise formed of grounding shelf ice. This implies continuous, 400-600-m-thick grounded ice, consistent with but not proving the postulated existence of an Arctic ice sheet. Most plowmarks are probably late Pleistocene products of the calving of Barents-Kara ice sheets into the Arctic Ocean. Plowmarks in 450-850-m-deep water require unusually deep ice-sheet grounding lines (e.g., Svyataya Anna Trough) and/or draft-increasing capsizing events, even if sea levels were 100-150 m lower than today. At water depths of 800 to 1800 m, the sidescan texture and topography suggest bottom currents descending the northeast slope of the plateau. C1 UNIV BERGEN,SEISMOL OBSERV,N-5007 BERGEN,NORWAY. RP VOGT, PR (reprint author), USN,RES LAB,DIV MARINE GEOSCI,WASHINGTON,DC 20375, USA. NR 15 TC 70 Z9 71 U1 2 U2 4 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD MAY PY 1994 VL 22 IS 5 BP 403 EP 406 DI 10.1130/0091-7613(1994)022<0403:DPIPOT>2.3.CO;2 PG 4 WC Geology SC Geology GA NJ871 UT WOS:A1994NJ87100005 ER PT J AU FRANKEL, MY ESMAN, RD WELLER, JF AF FRANKEL, MY ESMAN, RD WELLER, JF TI RAPID CONTINUOUS TUNING OF A SINGLE-POLARIZATION FIBER RING LASER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID FILTER AB We have developed and studied what we believe is the first fiber laser operating in a single polarization at 1550 nm with PM fiber output and capable of wavelength tuning over a 20-nm bandwidth in less than 50 mus. The fast wavelength tuning speed in a fiber laser is achieved by incorporating an acousto-optic tunable filter into the laser. The same filter is used in an optoelectronic feedback loop to suppress the relaxation oscillations induced by wavelength transitions. RP FRANKEL, MY (reprint author), USN,CODE 5670,WASHINGTON,DC 20375, USA. NR 9 TC 21 Z9 21 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD MAY PY 1994 VL 6 IS 5 BP 591 EP 593 DI 10.1109/68.285551 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NL837 UT WOS:A1994NL83700004 ER PT J AU WILLIAMS, KJ ESMAN, RD DAGENAIS, M AF WILLIAMS, KJ ESMAN, RD DAGENAIS, M TI EFFECTS OF HIGH SPACE-CHARGE FIELDS ON THE RESPONSE OF MICROWAVE PHOTODETECTORS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID INGAAS AB We present simulation results, based on a one-dimensional p-i-n photodetector model, to explain the reductions in photodetector response observed at high optical powers. The nonlinear effects are attributed to the redistribution of the internal electric field due to space-charge effects created by the photocarriers. The corresponding modification of the position-dependent charge velocities results in high-frequency response reduction, roll-off reduction, and pulse narrowing. Electric field redistribution leads to two-dimensional effects, which must be included for accurate modeling of milliampere photocurrents. C1 UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742. RP WILLIAMS, KJ (reprint author), USN,RES LAB,CODE 5670,WASHINGTON,DC 20375, USA. NR 10 TC 75 Z9 75 U1 1 U2 11 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 MAY PY 1994 VL 6 IS 5 BP 639 EP 641 DI 10.1109/68.285565 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NL837 UT WOS:A1994NL83700017 ER PT J AU KROWNE, CM AF KROWNE, CM TI VECTOR VARIATIONAL AND WEIGHTED RESIDUAL FINITE-ELEMENT PROCEDURES FOR HIGHLY ANISOTROPIC MEDIA SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID MAXWELL SOLUTIONS; SPURIOUS MODES; WAVE-GUIDES; FORMULATION; PARASITES AB Construction of energy-like expressions for various classes of anisotropic media and the use of the weighted residual technique for those cases that don't obey Hermitian properties is undertaken. From the energy-like expressions are derived energy-like functionals, which are shown to have volumetric and surface parts. Volumetric parts contain electromagnetic governing equations of the media, and surface parts provide constraints on field components on interfacial boundaries. Media examined here include gyroelectric, gyromagnetic, combined gyroelectric and gyromagnetic, and complex media displaying gyroelectric, gyromagnetic, and optical activities. RP KROWNE, CM (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,MICROWAVE TECHNOL BRANCH,WASHINGTON,DC 20375, USA. NR 31 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 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD MAY PY 1994 VL 42 IS 5 BP 642 EP 650 DI 10.1109/8.299563 PG 9 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NW194 UT WOS:A1994NW19400008 ER PT J AU ABDELHAMID, TK SENGUPTA, K HARDEBECK, MJ AF ABDELHAMID, TK SENGUPTA, K HARDEBECK, MJ TI THE EFFECT OF REWARD STRUCTURES ON ALLOCATING SHARED STAFF RESOURCES AMONG INTERDEPENDENT SOFTWARE PROJECTS - AN EXPERIMENTAL INVESTIGATION SO IEEE TRANSACTIONS ON ENGINEERING MANAGEMENT LA English DT Article DE SOFTWARE PROJECT STAFFING; PROJECT MANAGEMENT; REWARD STRUCTURES ID ORGANIZATIONS; DECISIONS; MANAGERS; SYSTEMS AB Organizational theorists have long proposed the use of organizational reward structures to enhance coordination between interdependent projects. In practice, however, the structuring of reward schemes has been problematic, leading in many cases to dysfunctional behavior. The purpose of the reported research is to investigate the impact of different reward structures on the allocation of shared staff resources among interdependent software projects. The research question was explored in the context of a role-playing project simulation game. Experimental dyads played the roles of managers on two concurrent software projects sharing a limited staff resource. Two reward structures were tested, one that rewarded subjects for maximizing their own outcome (an ''individualistic orientation''), and the other rewarded subjects for maximizing joint outcome (a ''cooperative orientation''). The results suggest that reward structures lead to greater interaction and to more effective strategies for utilizing the organization's staff resource, but they do not lead to less self-interested behavior. The findings of the current study extend the literature on reward structures beyond group performance on physical tasks to dynamic decision making. RP ABDELHAMID, TK (reprint author), USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943, USA. NR 41 TC 11 Z9 11 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 0018-9391 J9 IEEE T ENG MANAGE JI IEEE Trans. Eng. Manage. PD MAY PY 1994 VL 41 IS 2 BP 115 EP 125 DI 10.1109/17.293378 PG 11 WC Business; Engineering, Industrial; Management SC Business & Economics; Engineering GA NV885 UT WOS:A1994NV88500003 ER PT J AU STEINER, M AF STEINER, M TI THE STRONG SIMPLEX CONJECTURE IS FALSE SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Article DE SIGNAL DESIGN; SIMPLEX CONJECTURE; WHITE GAUSSIAN NOISE; M-ARY COMMUNICATION AB The design of M average-energy-constrained signals in additive white Gaussian noise is addressed. The long-standing strong simplex conjecture, which postulates that the regular simplex signal set maximizes the probability of correct detection under an average-energy constraint, is disproven. A signal set is presented that performs better than the regular simplex signal set at low signal-to-noise ratios for all M greater-than-or-equal-to 7. This leads to the result that, for all M greater-than-or-equal-to 7, there is no signal set of M signals which is optimal at all signal-to-noise ratios. Furthermore, the optimal signal set at low signal-to-noise ratios is not an equal energy set for any M greater-than-or-equal-to 7. The regular simplex is shown to be the unique signal set which maximizes the minimum distance between signals. It follows that a signal set which maximizes the minimum distance is not necessarily optimum. However, the regular simplex is shown to be globally optimum in the sense of uniquely maximizing the union bound on error probability at all signal-to-noise ratios. RP STEINER, M (reprint author), USN,RES LAB,DIV RADAR,WASHINGTON,DC 20375, USA. OI Steiner, Michael/0000-0003-3199-0935 NR 23 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 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD MAY PY 1994 VL 40 IS 3 BP 721 EP 731 DI 10.1109/18.335884 PG 11 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PA611 UT WOS:A1994PA61100010 ER PT J AU STEINER, M AF STEINER, M TI CONSTRUCTIVE CODES FOR ARBITRARY DISCRETE MEMORYLESS CHANNELS SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Letter DE CONSTRUCTIVE CODES; JUSTESEN CODES; CONCATENATED CODE; DISCRETE MEMORYLESS CHANNELS AB In 1982, Delsarte and Piret constructed a concatenated code for which the error probability decreases exponentially with the block length for a subclass of symmetric channels called regular channels. In the case of arbitrary discrete memoryless channels, they were not able to prove an exponential bound, but one for which the error probability decreases as (log N/N)alpha where alpha is related to the random coding exponent and N is the block length. In this paper we show that indeed, the codes also satisfy the much stronger exponential bound for arbitrary discrete memoryless channels and hence are good in this sense. It is also indicated that the codes are valid for the bandlimited additive Gaussian noise channel. RP STEINER, M (reprint author), USN,RES LAB,CODE 5341,BLDG 46,WASHINGTON,DC 20375, USA. OI Steiner, Michael/0000-0003-3199-0935 NR 12 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 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD MAY PY 1994 VL 40 IS 3 BP 929 EP 934 DI 10.1109/18.335905 PG 6 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PA611 UT WOS:A1994PA61100031 ER PT J AU GERLACH, K SANGSTON, KJ AF GERLACH, K SANGSTON, KJ TI A SHARP FALSE ALARM UPPER-BOUND FOR A MATCHED-FILTER BANK DETECTOR SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Letter DE HYPOTHESIS TESTING; DETECTION THEORY; MATCHED FILTERING; MATCHED FILTER BANK AB A sharp upper-bound on the probability of false alarm, P(F), of a matched filter bank detector over the class of input variates that are zero-mean and have a specified covariance matrix, R(xx), is derived. This bound is a function of the detector threshold, T, and R(xx). It is shown that the bound is inversely proportional to T2. Hence there may be a wide variation of P(F) over the class since the P(F) for Gaussian inputs varies as exp (-T2). RP GERLACH, K (reprint author), USN,RES LAB,DIV RADAR,CODE 5341,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 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD MAY PY 1994 VL 40 IS 3 BP 955 EP 960 DI 10.1109/18.335912 PG 6 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA PA611 UT WOS:A1994PA61100038 ER PT J AU WILLIAMS, SM KLINE, DB AF WILLIAMS, SM KLINE, DB TI AN OBJECT-ORIENTED GRAPHICAL APPROACH FOR TEACHING ELECTRIC MACHINERY ANALYSIS SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article; Proceedings Paper CT IEEE/PES 1993 Summer Meeting CY JUL 18-22, 1993 CL VANCOUVER, CANADA SP IEEE, POWER ENGN SOC AB This paper presents a teaching method used at the Naval Postgraduate School for electric machinery analysis. An objected-oriented, graphical tool for real-time simulation of electric machines is described. An undergraduate exercise is detailed to show how the use of the new analysis techniques significantly enhances the learning process. Rapid modeling of electric machines and subsequent simulation results encourage the student to explore machine behavior under a variety of transient and steady state operating conditions, thus significantly broadening the students knowledge of electric machinery. RP WILLIAMS, SM (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93940, USA. NR 6 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 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD MAY PY 1994 VL 9 IS 2 BP 585 EP 588 DI 10.1109/59.317686 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA NV466 UT WOS:A1994NV46600004 ER PT J AU ROWE, NC AF ROWE, NC TI INFERRING DEPICTIONS IN NATURAL-LANGUAGE CAPTIONS FOR EFFICIENT ACCESS TO PICTURE DATA SO INFORMATION PROCESSING & MANAGEMENT LA English DT Article ID SYSTEM AB Multimedia data can require significant examination time to find desired features (''content analysis''). An alternative is using natural-language captions to describe the data, and matching captions to English queries. But it is hard to include everything in the caption of a complicated datum, so significant content analysis may still seem required. We discuss linguistic clues in captions, both syntactic and semantic, that can simplify or eliminate content analysis. We introduce the notion of concept depiction and rules for depiction inference. Our approach is implemented in an expert system which demonstrated significant increases in recall in experiments. RP ROWE, NC (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,CODE CS-RP,MONTEREY,CA 93943, USA. NR 11 TC 8 Z9 8 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 MAY-JUN PY 1994 VL 30 IS 3 BP 379 EP 388 DI 10.1016/0306-4573(94)90051-5 PG 10 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA ND516 UT WOS:A1994ND51600006 ER PT J AU GIANGRECO, C PIQUETTE, JC AINSLEIGH, P ROSSETTO, JF BRUNET, E AF GIANGRECO, C PIQUETTE, JC AINSLEIGH, P ROSSETTO, JF BRUNET, E TI MEASUREMENT METHODOLOGY OF PROJECTORS IN CONFINED ENVIRONMENT SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 3rd French Conference on Acoustics CY MAY 02-06, 1994 CL LE MIRAL UNIV, TOULOUSE, FRANCE SP FRENCH ACOUST SOC HO LE MIRAL UNIV AB The intent of this paper is to describe the first stages of potentially ongoing collaborative research between the United States Naval Research Laboratory's Underwater Sound Reference Detachment (USRD) and France's DCN Ingenierie centre Sud Departement Lutte Sous-Marine (DCN/SUD/DLSM). The immediate focus of this collaborative work is on high Q electroacoustic transducer calibration in reverberation limited environments. This paper will be divided into three sections : the first one, a description of the motivating problem in reverberation limited measurements, the second one, a description of the two techniques developed by each laboratory, finally, research results and the activities necessary to complete the work in progress. C1 USRD,NRL,ORLANDO,FL 32856. NEREIDES,F-83088 TOULON,FRANCE. RP GIANGRECO, C (reprint author), DCN,ING,SUD,LSM,F-38140 SIX FOURS PLAGE,FRANCE. NR 4 TC 0 Z9 0 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 1155-4339 J9 J PHYS IV JI J. Phys. IV PD MAY PY 1994 VL 4 IS C5 BP 327 EP 330 DI 10.1051/jp4:1994567 PN 1 PG 4 WC Physics, Multidisciplinary SC Physics GA NT300 UT WOS:A1994NT30000068 ER PT J AU MADIGOSKY, W UBERALL, H AF MADIGOSKY, W UBERALL, H TI THE DYNAMIC INDENTATION OF A FINITE ELASTIC PLATE SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 3rd French Conference on Acoustics CY MAY 02-06, 1994 CL UNIV TOULOUSE, TOULOUSE, FRANCE SP FRENCH ACOUST SOC, UNIV TOULOUSE LE MIRAIL HO UNIV TOULOUSE AB The Shore hardness test has been widely used and has become the standard for characterizing materials in the rubber and plastics industries. The obtained hardness scale values, ASTM or IRHD, are often related to the static elastic properties of rubber like-materials. Recently, progress on the problem of obtaining dynamic viscoelastic properties has been made through the use of an oscillating spherical indentor and modeling the measured input impedance by the radiation impedance of a radiating sphere. When the sphere radius is small, such that ka<<1 for longitudinal waves, then the measured shear modulus and loss factor is in good agreement with that found using other dynamic methods such as the DMTA. This model is appropriate only for relatively soft materials or very thick hard materials where the thickness of the material can be ignored. The object of the current work is to extend the methodology to layers of finite thickness. The problem is studied under the assumptions of linear lasticity and the condition that there is perfect adhesion between the indentor and the elastic layer. The method of solution that is adopted will be described and as such it constitutes the first serious attempt to solve an elastodynamic boundary value problem of this type. C1 CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. RP MADIGOSKY, W (reprint author), NSWC,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 8 TC 2 Z9 2 U1 2 U2 3 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 1155-4339 J9 J PHYS IV JI J. Phys. IV PD MAY PY 1994 VL 4 IS C5 BP 825 EP 828 DI 10.1051/jp4:19945178 PN 2 PG 4 WC Physics, Multidisciplinary SC Physics GA NT301 UT WOS:A1994NT30100035 ER PT J AU KATZ, RA GALIB, T CEMBROLA, J AF KATZ, RA GALIB, T CEMBROLA, J TI MECHANISMS UNDERLYING TRANSITIONAL AND TURBULENT BOUNDARY-LAYER (TBL) FLOW-INDUCED NOISE IN UNDERWATER ACOUSTICS (II) SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 3rd French Conference on Acoustics CY MAY 02-06, 1994 CL UNIV TOULOUSE, TOULOUSE, FRANCE SP FRENCH ACOUST SOC, UNIV TOULOUSE LE MIRAIL HO UNIV TOULOUSE AB This research applies dynamical system methods (i.e., Chaos Theory) to the processing of time sequences of transitional and turbulent wall-pressures impinging on the face of station probes mounted along the wall of an axisymmetric body of revolution during a buoyant ascent from the bottom of a deep water test basin. It is demonstrated that the turbulent pressure fluctuations for this experiment can be described as a dynamical system of sufficiently low order (i.e., less than ten degrees of freedom). This opens up several possibilities for the control of turbulence. In underwater acoustics this translates to flow noise reduction in sonar applications and to drag reduction in ship dynamics. Other potential commercial applications include control of flow through pipelines and aerodynamic design. C1 USN,UNDERSEA WARFARE,CTR DIV,NEWPORT,RI 02841. RP KATZ, RA (reprint author), USN,UNDERSEA WARFARE,CTR DETACHMENT,NEW LONDON,CT 06320, USA. NR 3 TC 3 Z9 3 U1 1 U2 2 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 1155-4339 J9 J PHYS IV JI J. Phys. IV PD MAY PY 1994 VL 4 IS C5 BP 1063 EP 1066 DI 10.1051/jp4:19945233 PN 2 PG 4 WC Physics, Multidisciplinary SC Physics GA NT301 UT WOS:A1994NT30100090 ER PT J AU TUNCER, IH SANKAR, LN AF TUNCER, IH SANKAR, LN TI UNSTEADY AERODYNAMIC CHARACTERISTICS OF A DUAL-ELEMENT AIRFOIL SO JOURNAL OF AIRCRAFT LA English DT Article AB Unsteady aerodynamic behavior and load characteristics of a VR-7 slat/airfoil combination oscillating sinusoidally between 5-25 deg have been studied. The unsteady, compressible Navier-Stokes equations are solved on a multiblock grid using an approximate factorization finite difference scheme. In the case of a single airfoil, a massive flow separation and formation of a strong vortex is observed. The vortex-induced suction and the shedding of the vortex into the wake is responsible for high aerodynamic loads and the subsequent stall of the airfoil. In the case of a slat/airfoil combination, the suction peak at the leading edge of the airfoil is reduced significantly in comparison to the single airfoil. Flow separation is confined to the trailing edge of the main airfoil, and the formation of a strong vortical structure is not observed. The slat/airfoil combination does not experience a massive flow separation, and the aerodynamic lift does not undergo the characteristic deep dynamic stall hysteresis loops. RP TUNCER, IH (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 0 TC 4 Z9 5 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 MAY-JUN PY 1994 VL 31 IS 3 BP 531 EP 537 DI 10.2514/3.46526 PG 7 WC Engineering, Aerospace SC Engineering GA NR637 UT WOS:A1994NR63700009 ER PT J AU MOYER, SA TALBOT, MD AF MOYER, SA TALBOT, MD TI WIND-TUNNEL TEST TECHNIQUES FOR UNMANNED AERIAL VEHICLE SEPARATION INVESTIGATIONS SO JOURNAL OF AIRCRAFT LA English DT Article; Proceedings Paper CT AIAA 31st Aerospace Sciences Meeting CY JAN 11-14, 1993 CL RENO, NV SP AMER INST AERONAUT & ASTRONAUT AB Wind-tunnel tests of an unmanned aerial vehicle (UAV) separating from two righter aircraft have been conducted. UAVs present different concerns in separation testing than do conventional stores due to the presence of large lifting surfaces, physical size, and control surface effects. The planning and results of these recent investigations give several new results with respect to the separation testing of complex configurations. Separation trajectory simulations using experimental data have been used to demonstrate the unique requirements of UAV separation testing. The simulation demonstrates that simplifications in the aerodynamic grid proximity testing matrix can be made without sacrificing simulation accuracy. Results indicate that simplification in ejector modeling used with simple stores should not be applied to UAVs. The simulations also indicated that it is important to properly model the aircraft control surface effects on the UAV. RP MOYER, SA (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,FLIGHT DYNAM BRANCH,WARMINSTER,PA 18974, 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 MAY-JUN PY 1994 VL 31 IS 3 BP 585 EP 590 DI 10.2514/3.46534 PG 6 WC Engineering, Aerospace SC Engineering GA NR637 UT WOS:A1994NR63700017 ER PT J AU KARPOUZIAN, G LIBRESCU, L AF KARPOUZIAN, G LIBRESCU, L TI COMPREHENSIVE MODEL OF ANISOTROPIC COMPOSITE AIRCRAFT WINGS SUITABLE FOR AEROELASTIC ANALYSES SO JOURNAL OF AIRCRAFT LA English DT Article AB A comprehensive plate-beam structural model suitable for aeroelastic analyses of aircraft wings made of anisotropic composite materials is developed. The equations governing the static and dynamic aeroelastic equilibrium of cantilevered swept-wing structures and the associated boundary conditions are derived by means of the Hamilton variational principle. These equations incorporate a number of effects: 1) anisotropy of the materials of constituent layers, 2) warping inhibition, 3) transverse shear flexibility, and 4) rotatory inertias. A uniform swept-wing model composed of a transversely isotropic material is considered to illustrate the coupled and separate effects of transverse shear deformation and warping restraint upon its divergence and static aeroelastic load distribution. An exact method based upon the Laplace integral transform technique is used to solve the above mentioned problems. The results displayed in this article reveal the importance of transverse shear and warping restraint effects in predicting more accurately the static aeroelastic response of swept-forward wings. However, for swept-back wings, these effects represent higher-order corrections to the classical theory. RP KARPOUZIAN, G (reprint author), USN ACAD,DEPT AEROSP ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 25 Z9 26 U1 1 U2 2 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 MAY-JUN PY 1994 VL 31 IS 3 BP 703 EP 712 DI 10.2514/3.46551 PG 10 WC Engineering, Aerospace SC Engineering GA NR637 UT WOS:A1994NR63700034 ER PT J AU YUNGINGER, JW JONES, RT FRANSWAY, AF KELSO, JM WARNER, MA HUNT, LW AF YUNGINGER, JW JONES, RT FRANSWAY, AF KELSO, JM WARNER, MA HUNT, LW TI EXTRACTABLE LATEX ALLERGENS AND PROTEINS IN DISPOSABLE MEDICAL GLOVES AND OTHER RUBBER PRODUCTS SO JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY LA English DT Article DE LATEX; RUBBER; ALLERGENS; PROTEINS; DISPOSABLE GLOVES ID ANTIGENS; PREVALENCE AB Background: IgE-mediated sensitization to rubber proteins is being reported with increasing frequency in health care workers. To explore the relative importance of various sources of allergen exposure, we measured the total rubber allergen and protein levels in extracts of disposable rubber gloves and compared the allergen levels with those in extracts of other medical and consumer rubber products. Methods: Rubber allergens were measured by inhibition immunoassay with a rubber glove extract as the solid-phase allergen and pooled plasma from five rubber-sensitized health care workers as the IgE antibody source. Proteins were measured by Ninhydrin assay. Results: Among 71 lots of gloves tested, the extractable allergen and protein levels were significantly correlated and were appreciably higher in powdered gloves than in powder-free gloves. Allergen levels varied 3000-fold among gloves Fern different manufacturers and were higher in examination gloves than in surgical or chemotherapy gloves. Measurable allergen was found in 11 of 24 lots of ''hypoallergenic'' gloves tested. Allergen levels in toy balloons were comparable to those in powdered gloves; much lower allergen levels were measured in condoms and anesthesia rebreathing bags. Conclusions: The allergen content of disposable rubber gloves varies widely and is higher in powdered gloves than in powder-free gloves and higher in examination gloves than in surgical gloves. Hypoallergenic gloves may contain substantial amounts of IgE-binding proteins. Gloves and toy balloons appear to be more important sources of rubber allergens than the other rubber products tested C1 MAYO CLIN & MAYO FDN,DEPT PEDIAT,ROCHESTER,MN 55905. MAYO CLIN & MAYO FDN,DEPT INTERNAL MED,DIV ALLERG DIS,ROCHESTER,MN 55905. MAYO CLIN & MAYO FDN,DEPT DERMATOL,ROCHESTER,MN 55905. MAYO CLIN & MAYO FDN,DEPT ANESTHESIOL,ROCHESTER,MN 55905. MAYO CLIN & MAYO FDN,ALLERG DIS RES LAB,ROCHESTER,MN 55905. USN HOSP,DEPT INTERNAL MED,DIV ALLERGY,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. NR 19 TC 162 Z9 165 U1 1 U2 5 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0091-6749 J9 J ALLERGY CLIN IMMUN JI J. Allergy Clin. Immunol. PD MAY PY 1994 VL 93 IS 5 BP 836 EP 842 DI 10.1016/0091-6749(94)90374-3 PG 7 WC Allergy; Immunology SC Allergy; Immunology GA NL919 UT WOS:A1994NL91900005 PM 8182224 ER PT J AU KELSO, JM HUGH, MY LIN, FL AF KELSO, JM HUGH, MY LIN, FL TI RECALL URTICARIA SO JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY LA English DT Note C1 USN,MED CTR,DEPT INTERNAL MED,DIV ALLERGY,SAN DIEGO,CA. USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA. NR 5 TC 7 Z9 8 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0091-6749 J9 J ALLERGY CLIN IMMUN JI J. Allergy Clin. Immunol. PD MAY PY 1994 VL 93 IS 5 BP 949 EP 950 DI 10.1016/0091-6749(94)90392-1 PG 2 WC Allergy; Immunology SC Allergy; Immunology GA NL919 UT WOS:A1994NL91900023 PM 8182240 ER PT J AU PEAK, JE TAG, PM AF PEAK, JE TAG, PM TI SEGMENTATION OF SATELLITE IMAGERY USING HIERARCHICAL THRESHOLDING AND NEURAL NETWORKS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article AB A significant task in the automated interpretation of cloud features on satellite imagery is the segmentation of the image into separate cloud features to be identified. A new technique, hierarchical threshold segmentation (HTS), is presented. In HTS, region boundaries are defined over a range of gray-shade thresholds. The hierarchy of the spatial relationships between collocated regions from different thresholds is represented in tree form. This tree is pruned, using a neural network, such that the regions of appropriate sizes and shapes are isolated. These various regions from the pruned tree are then collected to form the final segmentation of the entire image. In segmentation testing using Geostationary Operational Environmental Satellite data, HTS selected 94% of 101 dependent sample pruning points correctly, and 93% of 105 independent sample pruning points. Using Advanced Very High Resolution Radiometer data, HTS correctly selected 90% of both the 235-case dependent sample and the 253-case independent sample pruning points. The strength of this approach is that artificial intelligence, that is, reasoning about the sizes and shapes of the emergent regions, is applied during the segmentation process. The neural network component can be trained to respond more favorably to shapes of interest to a particular analysis problem. C1 USN,DIV MARINE METEOROL,RES LAB,MONTEREY,CA 93943. COMP SCI CORP,MONTEREY,CA. NR 8 TC 36 Z9 44 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD MAY PY 1994 VL 33 IS 5 BP 605 EP 616 DI 10.1175/1520-0450(1994)033<0605:SOSIUH>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NJ724 UT WOS:A1994NJ72400003 ER PT J AU SKUPNIEWICZ, CE AF SKUPNIEWICZ, CE TI 2-ZONE CONVECTIVE SCALING OF DIFFUSION IN COMPLEX TERRAIN SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID BOUNDARY-LAYER; MIXED LAYER; DISPERSION AB A ''two-zone'' convective scaling equation is developed that allows for a step change in scaling parameters. The results of the Lompoc Valley Diffusion Experiment, conducted at coastal site in California under variable cloud cover, are compared to the two-zone model and five other parameterizations obtained from the literature. The two-zone method is shown to unambiguously select appropriate convective scaling parameters for the partially cloud-covered cases. Its accuracy is comparable to a statistical approach that relies on in situ turbulence measurements and a Langrangian time scale derived from the data. While the two-zone method works for maximum concentration predictions at any downwind distance, all models underpredict plume width and crosswind-integrated concentration measured at long ranges. It is speculated that the observed enhancement is due to near-surface topographic flows that spread the plume at the surface but maintain centerline concentration. RP SKUPNIEWICZ, CE (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MR-SK,589 DYER RD,ROOM 252,MONTEREY,CA 93943, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD MAY PY 1994 VL 33 IS 5 BP 642 EP 653 DI 10.1175/1520-0450(1994)033<0642:TZCSOD>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NJ724 UT WOS:A1994NJ72400006 ER PT J AU ROBINSON, H HAHN, Y GAU, JN AF ROBINSON, H HAHN, Y GAU, JN TI MODAL-ANALYSIS OF 2ND-ORDER MECHANICAL REFLECTIONS IN OBLIQUE-INCIDENCE GROOVED GRATINGS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ACOUSTIC-WAVE REFLECTIONS; COMPREHENSIVE ANALYSIS AB Reflection effects in oblique incidence grooved gratings in the presence of propagating surface acoustic waves are analyzed. The particle displacements associated with these waves are described by a modal expansion including second-order evanescent and propagating bulk waves. The reflection coefficient and velocity shift are derived to first and second order (in the overlay height) using the boundary condition matching method. It is shown that the same second-order effects predicted for normal incidence groove gratings will exist for oblique incidence groove gratings. In addition, the reflection coefficient and velocity shift behavior are examined as functions of incidence angle and metallization ratio. C1 UNIV CONNECTICUT,STORRS,CT 06269. ANDERSEN LABS,BLOOMFIELD,CT 06002. RP ROBINSON, H (reprint author), USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320, USA. NR 13 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 1 PY 1994 VL 75 IS 9 BP 4371 EP 4381 DI 10.1063/1.355981 PG 11 WC Physics, Applied SC Physics GA NJ734 UT WOS:A1994NJ73400009 ER PT J AU OTTINGER, PF ROSE, DV OLSON, CL AF OTTINGER, PF ROSE, DV OLSON, CL TI EFFECT OF TIME-OF-FLIGHT BUNCHING ON EFFICIENCY OF LIGHT-ION-BEAM INERTIAL-CONFINEMENT-FUSION TRANSPORT SCHEMES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHANNELS; DESIGN; DIODE AB The Laboratory Microfusion Facility (LMF) has been proposed for the study of high-gain, high-yield inertial-confinement-fusion targets. The light-ion LMF approach uses a multimodular system with applied-B extraction diodes as ion sources. A number of ion-beam transport and focusing schemes are being considered to deliver the beams from the diodes to the target. These include ballistic transport with solenoidal lens focusing, z-discharge channel transport, and wire-guided transport. The energy transport efficiency eta(t) has been defined and calculated as a function of various system parameters so that point designs can be developed for each scheme. The analysis takes into account target requirements and realistic constraints on diode operation, beam transport, and packing. The effect on eta(t) of voltage ramping for time-of-flight beam bunching during transport is considered here. Although only 5 mrad microdivergence calculations are presented here, results for bunching factors of less-than-or-equal-to 3 show that transport efficiencies of >50% can be obtained for all three systems within a range of system parameters which seem achievable (i.e., for diode microdivergence within 5-10 mrad, for diode radius within 10-15 cm, and for diode-ion-current density within 2-10 kA/cm2). In particular, the point design for the baseline LMF system using ballistic transport with solenoidal lens focusing and a bunching factor of 2 was calculated to have eta(t) = 8 4 %. Other factors affecting the overall system efficiency, but not included in the analysis, are also identified and estimated. C1 JAYCOR INC,VIENNA,VA 22182. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP OTTINGER, PF (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 29 TC 6 Z9 6 U1 0 U2 0 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 MAY 1 PY 1994 VL 75 IS 9 BP 4402 EP 4414 DI 10.1063/1.355984 PG 13 WC Physics, Applied SC Physics GA NJ734 UT WOS:A1994NJ73400012 ER PT J AU LOMAX, JF AF LOMAX, JF TI KINETIC CLASSROOM - ACID-BASE AND REDOX DEMONSTRATIONS WITH STUDENT MOVEMENT SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article RP LOMAX, JF (reprint author), USN,ANNAPOLIS,MD 21402, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD MAY PY 1994 VL 71 IS 5 BP 428 EP 430 PG 3 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA NN507 UT WOS:A1994NN50700018 ER PT J AU HILL, CW TAO, M GEDRIDGE, RW STRINGFELLOW, GB AF HILL, CW TAO, M GEDRIDGE, RW STRINGFELLOW, GB TI PYROLYSIS OF DIISOPROPYLANTIMONY HYDRIDE - A NEW PRECURSOR FOR ORGANOMETALLIC VAPOR-PHASE EPITAXY SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE DIISOPROPYLANTIMONY HYDRIDE (DIPSBH); ORGANOMETALLIC VAPOR PHASE EPITAXY (OMVPE); PYROLYSIS; SB COMPOUNDS ID DECOMPOSITION MECHANISMS AB The pyrolysis of diisopropylantimony hydride (DIPSbH), (C3H7)2SbH, has been studied in an isothermal flow-tube reactor. The reaction products in H-2, D2, and He carrier gases were studied using a time-of-flight mass spectrometer. T50 for this compound (200-degrees-C) is significantly lower than that of other antimony sources, such as trimethylantimony (450-degrees-C). In addition to the hydride, the decomposition of diisopropylantimony deuteride (DIPSbD), (C3H7)2SbD, was studied to provide insight into the pyrolysis mechanism. The rate limiting step was found to be first-order and is believed to be a reductive elimination reaction which produces C3H8 in the case of DIPSbH and C3H7D in the case of DIPSbD. An increase in the ratio of [C3H6] to [C3H8] was observed as the temperature was increased from 200 to 275-degrees-C, indicating that other reactions, possibly beta-hydrogen elimination, are important as well. The reaction rate and the products produced were not affected by changing the carrier gas. The temperature dependence of the vapor pressure was determined and is described by the equation log (P)(Torr) = 7.948-2100/T(1/K). C1 USN,CTR WARFARE,DIV WEAPONS,CHINA LAKE,CA 93555. RP HILL, CW (reprint author), UNIV UTAH,DEPT MAT SCI & ENGN,SALT LAKE CITY,UT 84112, USA. NR 11 TC 4 Z9 4 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 MAY PY 1994 VL 23 IS 5 BP 447 EP 451 DI 10.1007/BF02671228 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA NJ539 UT WOS:A1994NJ53900004 ER PT J AU BRODIE, JH AF BRODIE, JH TI MILITARY FAMILY PHYSICIANS SO JOURNAL OF FAMILY PRACTICE LA English DT Letter RP BRODIE, JH (reprint author), USN,MED CORPS,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU APPLETON & LANGE PI E NORWALK PA 25 VAN ZANT ST, E NORWALK, CT 06855 SN 0094-3509 J9 J FAM PRACTICE JI J. Fam. Pract. PD MAY PY 1994 VL 38 IS 5 BP 538 EP 538 PG 1 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA NL779 UT WOS:A1994NL77900020 ER PT J AU POWERS, RT PRICE, GL AF POWERS, RT PRICE, GL TI COCYCLE CONJUGACY CLASSES OF SHIFTS ON THE HYPERFINITE-II(1) FACTOR SO JOURNAL OF FUNCTIONAL ANALYSIS LA English DT Article ID POWERS BINARY SHIFTS; TYPE-II1 FACTORS; OUTER CONJUGACY; INDEX AB We study a class of endomorphisms of subfactor index 2, called binary shifts, on the hyperfinite II1 factor. Invariants are identified for cocycle conjugacy and strong cocycle conjugacy classes. In particular, there is a connection between the Bratteli diagram associated with a binary shift and strong cocycle conjugacy. (C) 1994 Academic Press, Inc. C1 USN ACAD,DEPT MATH 9E,ANNAPOLIS,MD 21402. RP POWERS, RT (reprint author), UNIV PENN,DEPT MATH E1,PHILADELPHIA,PA 19104, USA. NR 12 TC 16 Z9 16 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-1236 J9 J FUNCT ANAL JI J. Funct. Anal. PD MAY 1 PY 1994 VL 121 IS 2 BP 275 EP 295 DI 10.1006/jfan.1994.1050 PG 21 WC Mathematics SC Mathematics GA NK202 UT WOS:A1994NK20200002 ER PT J AU GANGULI, G KESKINEN, MJ ROMERO, H HEELIS, R MOORE, T POLLOCK, C AF GANGULI, G KESKINEN, MJ ROMERO, H HEELIS, R MOORE, T POLLOCK, C TI COUPLING OF MICROPROCESSES AND MACROPROCESSES DUE TO VELOCITY SHEAR - AN APPLICATION TO THE LOW-ALTITUDE IONOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ION-CYCLOTRON INSTABILITY; LOWER HYBRID ACCELERATION; AURORAL-F-REGION; ELECTRIC-FIELD; MAGNETIC-FIELD; SATELLITE-OBSERVATIONS; EQUATORIAL ELECTROJET; ELECTROSTATIC SHOCKS; POLAR MAGNETOSPHERE; PLASMA AB Recent observations indicate that low-altitude (below 1500 km) ion energization and thermal ion upwelling are colocated in the convective flow reversal region. In this region the convective velocity V perpendicular-to is generally small but spatial gradients in V perpendicular-to can be large. As a result, Joule heating is small. The observed high level of ion heating (few electron volts or more) cannot be explained by classical Joule heating alone but requires additional heating sources such as plasma waves. At these lower altitudes, sources of free energy are not obvious and hence the nature of ion energization remains ill understood. The high degree of correlation of ion heating with shear in the convective velocity (Tsunoda et al., 1989) is suggestive of an important role of velocity shear in this phenomenon. We provide more recent evidence for this correlation and show that even a small amount of velocity shear in the transverse flow is sufficient to excite a large-scale Kelvin-Helmholtz mode, which can nonlinearly steepen and give rise to highly stressed regions of strongly sheared flows. Furthermore, these stressed regions of strongly sheared flows may seed plasma waves in the range of ion cyclotron to lower hybrid frequencies, which are potential sources for ion heating. This novel two-step mechanism for ion energization is applied to typical observations of low-altitude thermal ion upwelling events. C1 UNIV TEXAS,RICHARDSON,TX 75083. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. RP GANGULI, G (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. RI Moore, Thomas/D-4675-2012 OI Moore, Thomas/0000-0002-3150-1137 NR 73 TC 124 Z9 125 U1 0 U2 3 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 MAY 1 PY 1994 VL 99 IS A5 BP 8873 EP 8889 DI 10.1029/93JA03181 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NK217 UT WOS:A1994NK21700032 ER PT J AU LIGRANI, PM WIGLE, JM CIRIELLO, S JACKSON, SM AF LIGRANI, PM WIGLE, JM CIRIELLO, S JACKSON, SM TI FILM-COOLING FROM HOLES WITH COMPOUND ANGLE ORIENTATIONS .1. RESULTS DOWNSTREAM OF 2 STAGGERED ROWS OF HOLES WITH 3D SPANWISE SPACING SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE FORCED CONVECTION; TURBINES ID HEAT-TRANSFER AB Experimental results are presented that describe the development and structure of flow downstream of two staggered rows of film-cooling holes with compound angle orientations. With this configuration, holes are spaced 3d apart in the spanwise direction, inclined at 35 deg with respect to the test surface when projected into the streamwise/normal plane, and inclined at 30 deg with respect to the test surface when projected into the spanwise/normal plane. Results are presented for an injectant to free-stream density ratio near 1.0, and injection blowing ratios from 0.5 to 1.50. Comparisons are made with measurements from two other configurations to determine: (1) the effects of hole angle orientation for constant spanwise hole spacing, and (2) the effects of spanwise hole spacing when the hole angle orientation is maintained constant. Results from the first comparison show that the compound angle injection configuration provides significantly improved film-cooling protection compared to a simple angle configuration for the same spanwise hole spacing, normalized streamwise location x/d, and blowing ratio m, for x/d < 60. At x/d > 60, spanwise-averaged adiabatic effectiveness data downstream of the two configurations generally cover about the same range. Results from the second comparison show that spanwise-averaged effectiveness values are 25 to 40 percent higher when 3d span wise hole spacing is employed compared to 3.9d span wise hole spacing for the same m and x/d, for x/d < 40. At x/d > 40, differences between the two configurations range from 12 to 30 percent. Results from all configurations studied show that spanwise-averaged iso-energetic Stanton number ratios cover approximately the same range of values and show roughly the same trends, ranging between 1.0 and 1.25. In particular, St(f)/St(o) values increase with m at each x/d, and show little variation with x/d for each value of m tested. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP LIGRANI, PM (reprint author), UNIV UTAH,SALT LAKE CITY,UT 84112, USA. NR 17 TC 65 Z9 66 U1 4 U2 11 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD MAY PY 1994 VL 116 IS 2 BP 341 EP 352 DI 10.1115/1.2911406 PG 12 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA NP562 UT WOS:A1994NP56200009 ER PT J AU LIGRANI, PM WIGLE, JM JACKSON, SW AF LIGRANI, PM WIGLE, JM JACKSON, SW TI FILM-COOLING FROM HOLES WITH COMPOUND ANGLE ORIENTATIONS .2. RESULTS DOWNSTREAM OF A SINGLE ROW OF HOLES WITH 6D SPANWISE SPACING SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE FORCED CONVECTION; TURBINES AB Experimental results are presented that describe the development and structure Of flow downstream of a single row of film-cooling holes with compound angle orientations. With this configuration, holes are spaced 6d apart in the spanwise direction, inclined at 35 deg with respect to the test surface when projected into the streamwise/normal plane, and inclined at 30 deg with respect to the test surface when projected into the span wise/normal plane. Results are presented for an injectant to free-stream density ratio near 1.0, and injection blowing ratios from 0.5 to 1.50. Comparisons are made with measurements from two other configurations to determine: (1) the effects of hole angle orientation for constant spanwise hole spacing, and (2) the effects of spanwise hole spacing when the hole angle orientation is maintained constant. Results from the first comparison show that the compound angle injection configuration provides significantly improved, film-cooling protection compared to a simple angle configuration for the same spanwise hole spacing, normalized streamwise location x/d, and blowing ratio m, for x/d < 30 when m = 0.50 and for x/d < 60 when m = 1.0 and 1.5. At x/d> 60, spanwise-averaged adiabatic effectiveness data downstream of the two configurations generally cover about the same range. Results from the second comparison show that spanwise-averaged effectiveness values are 20 to 39 percent higher when 6d spanwise hole spacing is employed compared to 7.8d spanwise hole spacing for the same m and x/d, for x/d < 60. When plotted in etaBAR/m versus Xl/s coordinates, spanwise-averaged film effectiveness data measured downstream of one and two rows of holes from all injection configurations tested show a reasonable collapse. For m values between 1 and 3, spanwise-averaged iso-energetic Stanton number ratios measured just downstream of one row of holes are lower than results measured just downstream of two rows of holes, which evidences greater mixing and higher turbulence levels when the injectant emerges from two rows of holes. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP LIGRANI, PM (reprint author), UNIV UTAH,DEPT MECH ENGN,SALT LAKE CITY,UT 84112, USA. NR 6 TC 52 Z9 55 U1 2 U2 10 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD MAY PY 1994 VL 116 IS 2 BP 353 EP 362 DI 10.1115/1.2911407 PG 10 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA NP562 UT WOS:A1994NP56200010 ER PT J AU BROOK, I AF BROOK, I TI MICROAEROPHILIC STREPTOCOCCAL INFECTION IN CHILDREN SO JOURNAL OF INFECTION LA English DT Article ID GRAM-POSITIVE COCCI; ANAEROBIC BACTERIOLOGY; ABSCESS; SINUSITIS; THERAPY; FLORA C1 USN HOSP,DEPT PEDIAT,BETHESDA,MD. NR 29 TC 4 Z9 4 U1 0 U2 0 PU W B SAUNDERS CO LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0163-4453 J9 J INFECTION JI J. Infect. PD MAY PY 1994 VL 28 IS 3 BP 241 EP 249 DI 10.1016/S0163-4453(94)91543-1 PG 9 WC Infectious Diseases SC Infectious Diseases GA NL368 UT WOS:A1994NL36800001 PM 8089512 ER PT J AU SANGHERA, JS NGUYEN, VQ PUREZA, PC KUNG, FH MIKLOS, R AGGARWAL, ID AF SANGHERA, JS NGUYEN, VQ PUREZA, PC KUNG, FH MIKLOS, R AGGARWAL, ID TI FABRICATION OF LOW-LOSS IR-TRANSMITTING GE30AS10SE30TE30 GLASS-FIBERS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID OPTICAL FIBERS; CHALCOGENIDE; ABSORPTION AB Improved purification and processing techniques have been utilized to fabricate Ge30As10Se30Te30 glass fibers with a minimum loss of 0.11 dB/m at 6.6 mum. This is the lowest loss reported for any telluride glass fiber in the infrared region. Furthermore, the fibers exhibit less than 1 dB/m loss between 5.25 and 9.5 mum. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT ELECT ENGN,BLACKSBURG,VA 24061. UNIV MARYLAND,RES FDN,GREENBELT,MD 20770. SFA INC,LANDOVER,MD 20785. RP SANGHERA, JS (reprint author), USN,RES LAB,CODE 56032,WASHINGTON,DC 20375, USA. NR 26 TC 59 Z9 59 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 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD MAY PY 1994 VL 12 IS 5 BP 737 EP 741 DI 10.1109/50.293962 PG 5 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA NT866 UT WOS:A1994NT86600004 ER PT J AU LEE, DK NIILER, P WARNVARNAS, A PIACSEK, S AF LEE, DK NIILER, P WARNVARNAS, A PIACSEK, S TI WIND-DRIVEN SECONDARY CIRCULATION IN OCEAN MESOSCALE SO JOURNAL OF MARINE RESEARCH LA English DT Article ID INERTIAL WAVES; MIXED LAYER; FRONT; FLOW AB A two-dimensional, numerical circulation model is used to study the response of a stratified, f-plane ocean current to wind stress forcing at the surface. Nonhydrostatic, primitive equations are integrated on a 3 m vertical and 400 m horizontal grid in a periodic domain perpendicular to the ocean current. Initially, a geostrophically balanced current [V(i)(x, z)] with a maximum Rossby number of 0.16-0.8 is maintained against horizontal and vertical diffusion by a body force. A spatially uniform wind is applied along and across this jet. A secondary circulation is created as a result of the nonlinear interaction between the jet and wind-driven flow in the Ekman layer. We present results from seven numerical experiments. When the wind blows in the direction of the jet (against the jct), a narrow upwelling (downwelling) area and broad downwelling (upwelling) area are formed. This secondary circulation pattern extends well below the mixed layer. When the wind blows perpendicular to the jet, the secondary circulation does not extend below the mixed layer. The fully nonlinear secondary circulation is 50% weaker than the circulation produced by the semi-linearized calculation around the basic state, V(i). Near-inertial fluctuations appear and are confined to the negative relative vorticity side of the circulation (dVBAR/dx < 0). The time-averaged vertical velocity can be as high as 1.5 m/day with a wind stress of 1 dyne/cm2 over a jct and a maximum Rossby number of 0.16. The magnitude of the vertical circulation in this symmetric basic state is dependent on the Rossby number and the horizontal and vertical mixing coefficients. C1 SACLANT RES CTR,APO,AE 09613. USN,RES LAB,BAY ST LOUIS,MS 39529. RP LEE, DK (reprint author), UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093, USA. NR 14 TC 24 Z9 24 U1 0 U2 7 PU KLINE GEOLOGY LABORATORY PI NEW HAVEN PA YALE UNIV, NEW HAVEN, CT 06520 SN 0022-2402 J9 J MAR RES JI J. Mar. Res. PD MAY PY 1994 VL 52 IS 3 BP 371 EP 396 DI 10.1357/0022240943077037 PG 26 WC Oceanography SC Oceanography GA NP743 UT WOS:A1994NP74300001 ER PT J AU OVERFELT, PL AF OVERFELT, PL TI ON THE POSSIBILITY OF LOCALIZED WAVE-PROPAGATION USING A CLASSICAL 2-FLUID MODEL OF SUPERCONDUCTORS SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTOR; TRANSMISSION-LINES; MAXWELL EQUATIONS; DIPOLE ANTENNA; RADIATION AB In this paper, the classical two-fluid model for superconductors is used to determine the time-dependent partial differential equations (PDEs) which govern wave propagation in superconducting media. These equations are then solved exactly in both two and three dimensions using localized wave solutions rather than the traditional eigenfunction solutions. We have applied these localized wave solutions to the problem of a symmetric superconducting slab, neglecting the normally conducting current density, and found that the resultant focus wave mode magnetic field solution expels flux from the interior of the slab and can regain its initial amplitude as it travels along the surface of the slab. A comparison of the transverse part of the localized wave solution with the transverse part of the more usual plane wave solution shows remarkable agreement. RP OVERFELT, PL (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 39 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD MAY PY 1994 VL 35 IS 5 BP 2233 EP 2258 DI 10.1063/1.530549 PG 26 WC Physics, Mathematical SC Physics GA NJ533 UT WOS:A1994NJ53300015 ER PT J AU WALLACE, MR WOELFL, I BOWLER, WA OLSON, PE MURRAY, NB BRODINE, SK OLDFIELD, EC ARVIN, AM AF WALLACE, MR WOELFL, I BOWLER, WA OLSON, PE MURRAY, NB BRODINE, SK OLDFIELD, EC ARVIN, AM TI TUMOR-NECROSIS-FACTOR, INTERLEUKIN-2, AND INTERFERON-GAMMA IN ADULT VARICELLA SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE TUMOR NECROSIS FACTOR; VARICELLA; CYTOKINES; ACYCLOVIR; HEPATITIS; THROMBOCYTOPENIA ID ZOSTER VIRUS; FACTOR-ALPHA; INFECTION AB Adult varicella can be a severe illness complicated by pneumonia, encephalitis, or prolonged fever. This study measured levels of tumor necrosis factor (TNF)-alpha, interleukin-2 (IL-2), and interferon gamma (IFN-G) in a consecutive group of 31 adult varicella patients presenting within 24 hours of rash onset. All cytokines were assayed using an ELISA technique. TNF-alpha was detectable in 71% of patients with a mean level of 52 pg/ml. IL-2 was detectable in 29% with a mean level of 1040 pg/ml. IFN-gamma was detectable in only 9%. There was no correlation between TNF, IL-2, or IFN-G level and clinical severity as determined by duration and severity of cutaneous findings, duration of fever, frequency of hepatitis, or thrombocytopenia. (C) 1994 Wiley-Liss, Inc.(*) C1 USN HOSP,DEPT INTERNAL MED INFECT DIS,SAN DIEGO,CA 92134. STANFORD UNIV,SCH MED,DEPT PEDIAT INFECT DIS,STANFORD,CA 94305. WAUSAU MED CTR,WAUSAU,WI. USN,HLTH RES CTR,SAN DIEGO,CA. RP WALLACE, MR (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. FU NIAID NIH HHS [AI20459] NR 12 TC 15 Z9 16 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 0146-6615 J9 J MED VIROL JI J. Med. Virol. PD MAY PY 1994 VL 43 IS 1 BP 69 EP 71 DI 10.1002/jmv.1890430113 PG 3 WC Virology SC Virology GA NG415 UT WOS:A1994NG41500012 PM 8083651 ER PT J AU YUDT, WM SILVERMAN, ED KISTLER, AM AF YUDT, WM SILVERMAN, ED KISTLER, AM TI SCINTIGRAPHIC DETECTION OF HEMOBILIA COMPLICATING ANGIODYSPLASIA SO JOURNAL OF NUCLEAR MEDICINE LA English DT Note DE HEMOBILIA; ANGIODYSPLASIA; GASTROINTESTINAL HEMORRHAGE ID GALLBLADDER VISUALIZATION; CELL SCINTIGRAPHY AB A 78-yr-old man underwent Tc-99m-labeled red cell examination for a gastrointestinal bleeding episode. Gallbladder visualization was noted during the examination. Hemobilia has been reported in a variety of pathologic conditions; scintigraphic gallbladder visualization has also been reported as a result of the unusual radiolabeling characteristics of (TC)-T-99m during red cell scintigraphy. Postmortem examination revealed angiodysplasia of the gallbladder and other sites in the gastrointestinal tract. Angiodysplasia must be considered in the pathologic spectrum of causes of hemobilia. C1 USN,MED CTR,DIV NUCL MED,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 11 TC 5 Z9 5 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD MAY PY 1994 VL 35 IS 5 BP 870 EP 871 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA NK514 UT WOS:A1994NK51400028 PM 8176474 ER PT J AU SHEN, CY AF SHEN, CY TI THE ACCELERATION FIELD ASSOCIATED WITH VORTICITY FLUX CONVERGENCE SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Note AB It is shown that each term that represents vorticity flux convergence or divergence in the quasigeostrophic potential vorticity equation can be inverted to obtain fluid acceleration associated with that term, and the same can be obtained for the vortex stretching term. The computed acceleration in the form of a ''force potential'' shows precisely how the process given by each vorticity term changes the flow field and contributes to its evolution, such as formation and propagation of current features. This complements the standard vorticity diagnostic, which evaluates the magnitudes of the terms only. Application to some simple unstable flows is presented. RP SHEN, CY (reprint author), USN,RES LAB,CODE 7250,WASHINGTON,DC 20375, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-3670 J9 J PHYS OCEANOGR JI J. Phys. Oceanogr. PD MAY PY 1994 VL 24 IS 5 BP 1070 EP 1076 DI 10.1175/1520-0485(1994)024<1070:TAFAWV>2.0.CO;2 PG 7 WC Oceanography SC Oceanography GA NL324 UT WOS:A1994NL32400015 ER PT J AU LAREDO, D MCCRORIE, JD VAUGHN, JK NETZER, DW AF LAREDO, D MCCRORIE, JD VAUGHN, JK NETZER, DW TI MOTOR AND PLUME PARTICLE-SIZE MEASUREMENTS IN SOLID-PROPELLANT MICROMOTORS SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID ROCKET MOTOR AB Particle size distributions were measured in the chamber, nozzle, and plume of a subscale solid propellant rocket motor. A significant reduction in the mean size of the aluminum/aluminum oxide particles occurred within the motor chamber. The mass fraction of small particles (<2 mu) at the nozzle entrance was less than 10%. Also, most particles were smaller than 50 mu, although a few as large as 85 mu were present. In the converging and throat portions of the nozzle it appeared that particle breakup dominated over collision coalescence. Collision coalescence was observed to occur more dominantly in the supersonic nozzle now. At the nozzle exit the particle mean size was usually less than 2.5 mu. The particle size distributions were bimodal or trimodal. with the larger particles concentrated near the plume centerline. Because of the short nozzle residence times it is not known whether or not these results are also applicable to full-scale motors. The mean size of the small Al2O3 particles in the plume edges was less than 0.5 mu in diam, with an index of refraction of 1.64 +/- 0.04 (apparently gamma-Al2O3), independent of propellant composition, motor operating conditions and nozzle geometry. RP LAREDO, D (reprint author), USN,POSTGRAD SCH,NATL RES COUNCIL,MONTEREY,CA 93943, USA. NR 25 TC 20 Z9 22 U1 0 U2 3 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 MAY-JUN PY 1994 VL 10 IS 3 BP 410 EP 418 DI 10.2514/3.23750 PG 9 WC Engineering, Aerospace SC Engineering GA NM077 UT WOS:A1994NM07700017 ER PT J AU BECKLEHIMER, JL PANDEY, RB AF BECKLEHIMER, JL PANDEY, RB TI PERCOLATION OF CHAINS AND JAMMING COVERAGE IN 2 DIMENSIONS BY COMPUTER-SIMULATION SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article DE PERCOLATION; CHAINS; JAMMING COVERAGE ID RANDOM SEQUENTIAL ADSORPTION; NORMAL-ALKANES; KINETICS; RECTANGLES; MIXTURES AB A computer simulation model is used to study the percolation of random chains with a self-avoiding constraint. The percolation threshold is found to decay with the chain length L(c) with a power law L(c)-0.1, while the jamming coverage varies as L(c)-1/3. C1 NAVAL RES LAB,BAY ST LOUIS,MS 39529. RP BECKLEHIMER, JL (reprint author), UNIV SO MISSISSIPPI,PROGRAM SCI COMP,HATTIESBURG,MS 39406, USA. NR 26 TC 19 Z9 19 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4715 J9 J STAT PHYS JI J. Stat. Phys. PD MAY PY 1994 VL 75 IS 3-4 BP 765 EP 771 DI 10.1007/BF02186881 PG 7 WC Physics, Mathematical SC Physics GA NU993 UT WOS:A1994NU99300015 ER PT J AU GASKIN, GB PILLA, GJ BROWN, SR AF GASKIN, GB PILLA, GJ BROWN, SR TI PREPARATION OF STAINLESS-STEEL ADHERENDS FOR ADHESIVE BONDING SO JOURNAL OF TESTING AND EVALUATION LA English DT Article DE ADHESIVE BONDING; STAINLESS STEEL PREBONDING PROCESSES; SURFACE PREPARATION; PASSIVATION; LAP SHEAR TENSION TEST; FLOATING ROLLER PEEL TEST; WEDGE CRACK EXTENSION TEST AB Adhesively bonded stainless steel aircraft components often fail prematurely at the adhesive/adherend interface. This failure results from exposure of the adhesively bonded joint to various mechanical and thermal stresses, as well as the exposure to hostile environments. Currently, there is not a single, reliable preparation for adhesive bonding that is universally employed for all classes of stainless steel. This study was conducted to evaluate several existing stainless steel prebonding processes, to determine the significant process factors contributing to the adhesive/stainless steel interfacial performance, and to develop a single reliable prebond preparation for stainless steels. Several surface pretreatments were evaluated with various classes of stainless steel. Wedge crack extension test results of moisture conditioned test specimens show that a newly developed pretreatment process yields the most stable passivation surface for various classes of stainless steel. RP GASKIN, GB (reprint author), USN,CTR AIR WARFARE,AIRCRAFT DIV WARMINSTER,WARMINSTER,PA 18974, USA. NR 6 TC 2 Z9 2 U1 0 U2 3 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0090-3973 J9 J TEST EVAL JI J. Test. Eval. PD MAY PY 1994 VL 22 IS 3 BP 222 EP 225 PG 4 WC Materials Science, Characterization & Testing SC Materials Science GA NJ542 UT WOS:A1994NJ54200006 ER PT J AU GRANNELL, JJ SHIRRON, JJ COUCHMAN, LS AF GRANNELL, JJ SHIRRON, JJ COUCHMAN, LS TI A HIERARCHICAL P-VERSION BOUNDARY-ELEMENT METHOD FOR AXISYMMETRICAL ACOUSTIC SCATTERING AND RADIATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID INTEGRAL-EQUATIONS; OSCILLATORY KERNELS; NUMERICAL-SOLUTION; APPROXIMATION AB A rapidly convergent boundary-element method that has a high-accuracy capability is developed for the solution of the exterior Neumann problem for the Helmholtz equation. The approach makes use of the boundary-operator combination idea of Burton and Miller [A. J. Burton and G. F. Miller, Proc. R. Soc. London Ser. A 323, 201-210 (1971)] to avoid the classical irregular frequency difficulties together with p-version boundary elements to obtain a high rate of convergence. The entire algorithm is designed to be fully hierarchic to minimize the cost of multiple solutions, which are necessary for a posteriori assessment of accuracy. A new hierarchic singular-kernel quadrature rule is developed for this purpose. Numerical examples demonstrate the accuracy and convergence rate of the method. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GRANNELL, JJ (reprint author), UNIV COLL CORK,DEPT MATH PHYS,CORK,IRELAND. NR 42 TC 15 Z9 15 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 MAY PY 1994 VL 95 IS 5 BP 2320 EP 2329 DI 10.1121/1.409867 PN 1 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NK799 UT WOS:A1994NK79900002 ER PT J AU SARKISSIAN, A AF SARKISSIAN, A TI METHOD OF SUPERPOSITION APPLIED TO SCATTERING FROM A TARGET IN SHALLOW-WATER SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WAVE-GUIDE; OBJECT; FIELDS AB An algorithm is developed to compute the field scattered from a target placed in shallow water. The method of superposition is applied where the scattered field is approximated to be equivalent to the field produced by a large number of point sources placed on a surface inside the target. The source strengths are determined by minimizing the least-squares error of the normal velocity on the surface of the target. This algorithm is applicable even when the source or the receiver is close to the target as well as in the case where the target is close to the surface. Scattering computations are made for a cylinder with hemispherical endcaps in an isovelocity fluid with soft boundary conditions on top and rigid boundary conditions on the bottom. They are compared to the scattered field computed by using an algorithm discussed by Ingenito [F. Ingenito, J. Acoust. Soc. Am. 82, 2051-2059 (1987)] for the case when both the source and the receiver are distant from the target and when the target is distant from the surface. Results from both methods agree in the range of applicability of Ingenito's method. RP SARKISSIAN, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 25 Z9 26 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 MAY PY 1994 VL 95 IS 5 BP 2340 EP 2345 DI 10.1121/1.409870 PN 1 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NK799 UT WOS:A1994NK79900005 ER PT J AU NUTZEL, B HERWIG, H KOENIGS, PD MONTI, JM AF NUTZEL, B HERWIG, H KOENIGS, PD MONTI, JM TI ACOUSTIC BACKSCATTER MEASUREMENTS IN THE NORTH-SEA - 3-18 KHZ SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID BUBBLE POPULATIONS; CLOUDS; WATERS AB Measurements were conducted in the North Sea to investigate the influence of near-surface bubbles on acoustic backscatter in the 3- to 18-kHz frequency range. At normal incidence, the scattering caused by bubbles contributes to reverberation. A partial ''screening'' (or masking) of the-surface was observed for short time periods when bubble plumes were introduced into the insonified volume. At lower grazing angles, the contribution to scattering by bubbles increases with wind speed and frequency such that, for a 30-deg grazing angle, the bubbles become the dominant backscattering mechanism at wind speeds of 35 and 18 kn for 10 and 18 kHz, respectively, and mark the onset of saturation. A comparison with other experimental data shows good agreement. C1 USN,CTR UNDERSEA WARFARE,DEPT ENVIRONM & TACT SUPPORT SYST,NEW LONDON,CT 06320. RP NUTZEL, B (reprint author), BUNDESWEHR WASSERSCHALL & GEOPHYS,FORSCHUNGSANSTALT,D-24148 KIEL,GERMANY. NR 15 TC 4 Z9 4 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 MAY PY 1994 VL 95 IS 5 BP 2488 EP 2494 PN 1 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NK799 UT WOS:A1994NK79900021 ER PT J AU BUTLER, JL MOFFETT, MB ROLT, KD AF BUTLER, JL MOFFETT, MB ROLT, KD TI A FINITE-ELEMENT METHOD FOR ESTIMATING THE EFFECTIVE COUPLING COEFFICIENT OF MAGNETOSTRICTIVE TRANSDUCERS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB A simple finite element method for determining the effective coupling coefficient of magnetostrictive transducers that includes the effects of both the mechanical and magnetic structure is presented. The method uses two finite element programs that are separately dedicated to mechanical and magnetic structures. An example based on a Terfenol-D driven barrel stave flextensional transducer is evaluated using the method. C1 USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320. MIT,DEPT OCEAN ENGN,CAMBRIDGE,MA 02139. RP BUTLER, JL (reprint author), IMAGE ACOUST INC,COHASSET,MA 02025, USA. NR 4 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1994 VL 95 IS 5 BP 2533 EP 2535 DI 10.1121/1.409863 PN 1 PG 3 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NK799 UT WOS:A1994NK79900026 ER PT J AU PFLUG, LA IOUP, GE IOUP, JW AF PFLUG, LA IOUP, GE IOUP, JW TI SAMPLING REQUIREMENTS FOR NTH-ORDER CORRELATIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter ID DETERMINISTIC TRANSIENTS; SPECTRA AB As has been derived previously [Pflug, MS thesis, Univ. of New Orleans (1990); Pflug et al., J. Acoust. Soc. Am. 91, 975-988 (1992); Pflug et al., J. Acoust. Soc. Am. 94, 2159-2172 (1993)], the sampling intervals required to prevent nonremovable and removable aliasing in higher-order correlations calculated from discrete-time data are Delta t(3) less than or equal to<1/(3f(t)) for the bicorrelation and Delta t(4) less than or equal to 1/(4f(t)) for the tricorrelation, where f(t) is the highest or top frequency present in a signal. It is shown here that a general expression for the sampling required to prevent aliasing for each order n of correlation calculated from discrete-time data is Delta t(n) less than or equal to 1/(nf(t)). Time-domain computer calculations of correlation central ordinate values for orders two through eight are consistent with this result. Removable aliasing can be eliminated for data which are sampled such that Delta t less than or equal to 1/(2f(t)) by (1) the application of n-dimensional transform or time-domain masking filters, (2) one-dimensional filtering of the transform domain diagonal factor, or (3) interpolation of the data before correlating. C1 UNIV NEW ORLEANS,DEPT PHYS,NEW ORLEANS,LA 70148. RP PFLUG, LA (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 11 TC 6 Z9 6 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 MAY PY 1994 VL 95 IS 5 BP 2762 EP 2765 DI 10.1121/1.408745 PN 1 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NK799 UT WOS:A1994NK79900054 ER PT J AU STREINZ, CC KRUGER, J MORAN, PJ AF STREINZ, CC KRUGER, J MORAN, PJ TI A MICROELLIPSOMETRIC STUDY OF THE PASSIVE FILM FORMATION ON AL-TA ALLOYS .1. SOLID-SOLUTION ALLOYS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID DYNAMIC IMAGING MICROELLIPSOMETRY; ANODIC OXIDE-FILMS; CORROSION BEHAVIOR; PITTING CORROSION; ION-IMPLANTATION; ALUMINUM-ALLOY; MOLYBDENUM; TANTALUM; MO; RESISTANCE AB Solid-solution Al-Ta alloys possess significantly higher pitting potentials than pure aluminum in Cl- solutions. Dynamic imaging microellipsometry was used to study the passive film formation on solid solution Al-Ta alloys. Film thickness was measured during growth for alloy compositions of pure Al, Al-8 a/o Ta, Al-25 a/o Ta, and pure Ta at applied potentials of 0.0, 1.0, 2.0, and 5.0 V SCE in a pH 7.2 borate buffer. Increasing the concentration of tantalum resulted in the formation of thinner passive films at all applied potentials. On pure Al and Al-8 a/o Ta, precipitation of an Al(OH)3 type film results in a linearly increasing film thickness with time. The relationship of film thickness measurements to the enhanced localized corrosion resistance is discussed. C1 JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218. RP STREINZ, CC (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 43 TC 7 Z9 7 U1 2 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 MAY PY 1994 VL 141 IS 5 BP 1126 EP 1131 DI 10.1149/1.2054884 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NJ886 UT WOS:A1994NJ88600010 ER PT J AU STREINZ, CC MORAN, PJ WAGNER, JW KRUGER, J AF STREINZ, CC MORAN, PJ WAGNER, JW KRUGER, J TI A MICROELLIPSOMETRIC STUDY OF THE PASSIVE FILM FORMATION ON AL-TA ALLOYS .2. THE ROLE OF AL3TA PRECIPITATES IN BREAKDOWN SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID DYNAMIC IMAGING MICROELLIPSOMETRY; CORROSION BEHAVIOR; ION-BEAM; ALUMINUM; MO; RESISTANCE; CHEMISTRY; SYSTEM; GROWTH AB Al3Ta precipitates act as sites for pit initiation and propagation in Al-Ta alloys. Dynamic imaging microellipsometry was used to measure the change in oxide film thickness and the refractive indexes of the films that form on the precipitates and matrix to examine the role of the precipitates in breakdown. Film formation was measured on an Al-1.5 a/o Ta alloy, containing Al3Ta precipitates approximately 50 mum in diameter at applied potentials of 0.0, 1.0, 2.0, and 5.0 V SCE in a pH 7.2 borate buffer solution. At 0.0 V SCE the change in passive film thickness on the precipitate was greater than that on the Al matrix. The changes in film thicknesses at 1.0 V SCE were approximately equal and at higher potentials (2.0 and 5.0 V SCE) the matrix film thickened more than the film on the precipitate. SEM observations demonstrate that the precipitate-matrix interface is highly susceptible to localized attack when the passive film on the Al3Ta is thicker than on the matrix (at 0.0 V SCE). We propose that pit initiation occurs at both the interface of the Al3Ta precipitation and in the dealloyed region around its periphery. C1 JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218. RP STREINZ, CC (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 44 TC 4 Z9 4 U1 0 U2 0 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 MAY PY 1994 VL 141 IS 5 BP 1132 EP 1137 DI 10.1149/1.2054885 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NJ886 UT WOS:A1994NJ88600011 ER PT J AU ABRAHAMS, J AF ABRAHAMS, J TI HUFFMAN-TYPE CODES FOR INFINITE SOURCE DISTRIBUTIONS SO JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS LA English DT Article AB A new sufficient condition is given for an infinite source distribution to share a minimum average codeword length code with the geometric distribution. Thus, some new examples of parametric families of infinite source distributions can be optimally encoded by Huffman-type codes. RP ABRAHAMS, J (reprint author), OFF NAVAL RES,DIV MATH SCI,ARLINGTON,VA 22217, USA. NR 0 TC 12 Z9 12 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 MAY PY 1994 VL 331B IS 3 BP 265 EP 271 DI 10.1016/0016-0032(94)90099-X PG 7 WC Automation & Control Systems; Engineering, Multidisciplinary; Engineering, Electrical & Electronic; Mathematics, Interdisciplinary Applications SC Automation & Control Systems; Engineering; Mathematics GA RY375 UT WOS:A1994RY37500003 ER PT J AU TRAN, P CELLI, V MARADUDIN, AA AF TRAN, P CELLI, V MARADUDIN, AA TI ELECTROMAGNETIC SCATTERING FROM A 2-DIMENSIONAL, RANDOMLY ROUGH, PERFECTLY CONDUCTING SURFACE - ITERATIVE METHODS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Note ID ENHANCED BACKSCATTERING AB Iterative methods offer a practical means for the calculation of wave scattering from two-dimensional surfaces. We present what is to our knowledge the first calculation of the scattering of an electromagnetic beam from a two-dimensional, randomly rough, perfectly conducting surface, using an iterative approach. We also examine a bootstrapping scheme of iteration that can further reduce computing time. C1 UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901. UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717. UNIV CALIF IRVINE,INST SURF & INTERFACE SCI,IRVINE,CA 92717. RP TRAN, P (reprint author), USN,CTR AIR WARFARE,CODE C02313,CHINA LAKE,CA 93555, USA. NR 8 TC 45 Z9 45 U1 1 U2 4 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 MAY PY 1994 VL 11 IS 5 BP 1686 EP 1689 DI 10.1364/JOSAA.11.001686 PG 4 WC Optics SC Optics GA NK239 UT WOS:A1994NK23900019 ER PT J AU HORSTMAN, WG HALUSZKA, MM BURKHARD, TK AF HORSTMAN, WG HALUSZKA, MM BURKHARD, TK TI MANAGEMENT OF TESTICULAR MASSES INCIDENTALLY DISCOVERED BY ULTRASOUND SO JOURNAL OF UROLOGY LA English DT Article DE TESTICULAR NEOPLASMS; ULTRASOUND; LEYDIG CELL TUMOR; SERTOLI CELL TUMOR ID LEYDIG-CELL TUMOR; CLINICALLY OCCULT; GYNECOMASTIA; TESTIS; ULTRASONOGRAPHY; NEOPLASMS AB Incidental nonpalpable testicular masses were discovered in 9 patients during approximately 1,600 scrotal ultrasound examinations done for other indications. Of the 9 lesions 7 (78%) were benign (4 Leydig cell tumors, 2 Sertoli cell tumors and 1 interstitial fibrosis) and 2 (22%) were malignant (1 teratocarcinoma and 1 seminoma). Five lesions (55%) were less than 1 cm. (4 benign and 1 malignant), while 4 (45%) were 1 to 2 cm. (3 benign and 1 malignant). Seven lesions (78%) were hypoechoic, 1 (11%) was hyperechoic and 1 (11%) was cystic. We conclude that incidentally discovered nonpalpable lesions are usually benign. Management should include inguinal exploration with frozen section diagnosis. The testis can be spared if the lesion is benign. Ultrasound followup should be used only if there is a strong clinical suspicion of a nonneoplastic lesion, such as recent trauma or infection. It is suggested that nonpalpable tumors discovered in patients with metastatic germ cell tumor should be treated as malignant. C1 USN,MED CTR,DEPT RADIOL,SAN DIEGO,CA 92134. USN,MED CTR,DEPT UROL,SAN DIEGO,CA 92134. RP HORSTMAN, WG (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 18 TC 55 Z9 57 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD MAY PY 1994 VL 151 IS 5 BP 1263 EP 1265 PG 3 WC Urology & Nephrology SC Urology & Nephrology GA NG390 UT WOS:A1994NG39000025 PM 8158772 ER PT J AU FERRER, FA MCKENNA, PH AF FERRER, FA MCKENNA, PH TI PARTIAL NEPHRECTOMY IN A METACHRONOUS MULTILOCULAR CYST OF THE KIDNEY (CYSTIC NEPHROMA) SO JOURNAL OF UROLOGY LA English DT Article DE CYSTS; KIDNEY; NEPHRECTOMY; MAGNETIC RESONANCE IMAGING; ANGIOGRAPHY ID CONTRALATERAL SURGICAL EXPLORATION; NONINVASIVE IMAGING TECHNIQUE; RENAL-ARTERIES; WILMS-TUMOR; REASSESSMENT; ANGIOGRAPHY; NECESSITY AB Cystic nephroma, that is multilocular cyst, is an uncommon renal neoplasm once thought to occur only unilaterally. We report a rare case of bilateral metachronous cystic nephroma in a child, which was treated by partial nephrectomy. Because of its benign nature this lesion is best managed by nephron sparing surgery. Exploration of the contralateral kidney is not necessary if modern radiological techniques are used. Magnetic resonance imaging angiography is an excellent noninvasive method to assess renal vessels before partial nephrectomy. Periodic ultrasound or computerized tomography screening of the remaining renal unit is recommended. C1 USN,MED CTR PORTSMOUTH,DIV PEDIAT NEUROL,PORTSMOUTH,VA. NR 25 TC 14 Z9 14 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD MAY PY 1994 VL 151 IS 5 BP 1358 EP 1360 PG 3 WC Urology & Nephrology SC Urology & Nephrology GA NG390 UT WOS:A1994NG39000060 PM 8158788 ER PT J AU HICKMAN, JJ BHATIA, SK QUONG, JN SCHOEN, P STENGER, DA PIKE, CJ COTMAN, CW AF HICKMAN, JJ BHATIA, SK QUONG, JN SCHOEN, P STENGER, DA PIKE, CJ COTMAN, CW TI RATIONAL PATTERN DESIGN FOR IN-VITRO CELLULAR NETWORKS USING SURFACE PHOTOCHEMISTRY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID SELF-ASSEMBLED MONOLAYERS; HIPPOCAMPAL-NEURONS; GROWTH; CULTURE; ADHESION; OUTGROWTH; MOLECULES; SURVIVAL; SILICON AB The ability to create patterns of specific silane monolayers by deep ultraviolet lithography has been previously demonstrated, and preliminary attempts have been made to use these patterns to control adhesion and outgrowth of neurons and other types of mammalian cells. Here we report characterization of the mechanisms involved in these photoinitiated processes and their utility in various strategies for creating patterns for biologically relevant systems. We have divided the mechanisms into three general classes. The first is surface photolysis of the silane monolayer, which appears to proceed by a purely photochemical mechanism. The second mechanism involves direct photochemical conversion of a terminal functional group on a silane monolayer into a species with altered properties, e.g., the conversion of a thiol to a more oxidized form that inhibits the subsequent adhesion of proteins. The third is a photolytic degradation of the monolayer. The mechanisms have been probed by x-ray photoelectron spectroscopy, ellipsometry, and wettability measurements. One result of these investigations has been the development of better strategies to create patterns. Controlled growth of hippocampal neurons on high resolution patterns is presented as demonstration of the efficacy of these strategies in spatially dictating cell adhesion. These results have important implications in designing in vitro culture systems to study well-oriented neuronal systems. C1 USN, RES LAB, CTR BIOMOLEC SCI & ENGN, WASHINGTON, DC 20375 USA. UNIV CALIF IRVINE, DEPT PSYCHOBIOL, IRVINE, CA 92717 USA. RP HICKMAN, JJ (reprint author), SCI APPLICAT INT CORP, MCLEAN, VA 22102 USA. NR 38 TC 72 Z9 73 U1 0 U2 4 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 MAY-JUN PY 1994 VL 12 IS 3 BP 607 EP 616 DI 10.1116/1.578844 PG 10 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA NL925 UT WOS:A1994NL92500001 ER PT J AU ALTMAN, EI COLTON, RJ AF ALTMAN, EI COLTON, RJ TI INTERACTION OF C-60 WITH THE AU(111) 23X-ROOT-3 RECONSTRUCTION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 1993 International Conference on Scanning Tunneling Microscopy (STM 93) CY AUG 09-13, 1993 CL BEIJING, PEOPLES R CHINA SP CHINESE ACAD SCI, INST CHEM, STATE SCI & TECHNOL COMMISS, CHINA ASSOC SCI & TECHNOL, NATL NAT SCI FDN CHINA, MINIST PERSONNEL BEIJING, STATE EDUC COMMISS, AMER VACUUM SOC, AVS NANOMETER SCALE SCI & TECHNOL DIV, SONY CORP RES CTR, ULVAC CORP, NIPPON STEEL, TOSHIBA R&D CTR, MATSUSHITA ELECT IND CO, SURFACE SCI RES FDN ID SCANNING TUNNELING MICROSCOPY; NUCLEATION; MOLECULE; SURFACES; CARBON; GROWTH; FILMS AB The interaction of C60 with the 23 X square-root 3 Au(111) reconstruction was studied using UHV scanning tunneling microscopy (STM). Preferred adsorption at fcc or bulk terminated sites was observed on deposition and after annealing to partially desorb the C60 layer. Disruptions in the reconstruction were observed on the bare Au substrate neighboring the C60 layer with reconstruction ridges terminating at the layer edges rather than continuing through the adsorbed layer. When low C60 deposition rates were used, STM measurements indicated that virtually all Au atoms at the C60 interface occupy fcc bulk terminated sites indicating that C60, unlike ordinary hydrocarbons, interacts strongly enough with Au to lift the reconstruction. These results are contrasted with results obtained at much higher deposition rates that showed an altered reconstruction at the C60-Au(111) interface. This variation with deposition rate is attributed to the concerted motion of Au atoms required to lift the reconstruction creating a kinetic constraint. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 17 TC 27 Z9 27 U1 1 U2 6 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 MAY-JUN PY 1994 VL 12 IS 3 BP 1906 EP 1909 DI 10.1116/1.587667 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NR918 UT WOS:A1994NR91800131 ER PT J AU HUES, SM DRAPER, CF COLTON, RJ AF HUES, SM DRAPER, CF COLTON, RJ TI MEASUREMENT OF NANOMECHANICAL PROPERTIES OF METALS USING THE ATOMIC-FORCE MICROSCOPE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 1993 International Conference on Scanning Tunneling Microscopy (STM 93) CY AUG 09-13, 1993 CL BEIJING, PEOPLES R CHINA SP CHINESE ACAD SCI, INST CHEM, STATE SCI & TECHNOL COMMISS, CHINA ASSOC SCI & TECHNOL, NATL NAT SCI FDN CHINA, MINIST PERSONNEL BEIJING, STATE EDUC COMMISS, AMER VACUUM SOC, AVS NANOMETER SCALE SCI & TECHNOL DIV, SONY CORP RES CTR, ULVAC CORP, NIPPON STEEL, TOSHIBA R&D CTR, MATSUSHITA ELECT IND CO, SURFACE SCI RES FDN ID THIN-FILMS AB The capability of the atomic force microscope (AFM) to quantitatively measure the nanoscale mechanical properties of metals via nanoindentation is illustrated with three single-crystal metals-chromium, molybdenum, and tungsten. Three distinct regions with differing elastic moduli are found: (1) a low modulus for the outermost surface layer whose thickness scales with the degree of hydrocarbon surface contamination, (2) a much higher modulus at a depth and thickness corresponding to the native oxide layer; and (3) an intermediate modulus at larger depths corresponding to the bulk modulus of the metal. In all cases, the modulus of the oxide is significantly larger than the bulk metal. Furthermore, the AFM can be used to ''depth profile'' the oxide layer giving new information about the sharpness of the oxide/metal interface. C1 VANDERBILT UNIV,DEPT MECH ENGN,NASHVILLE,TN 37205. RP HUES, SM (reprint author), USN,RES LAB,CODE 6170,WASHINGTON,DC 20375, USA. NR 12 TC 49 Z9 49 U1 0 U2 8 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 MAY-JUN PY 1994 VL 12 IS 3 BP 2211 EP 2214 DI 10.1116/1.587743 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NR918 UT WOS:A1994NR91800207 ER PT J AU FRIEBELE, EJ KERSEY, AD AF FRIEBELE, EJ KERSEY, AD TI FIBEROPTIC SENSORS MEASURE UP FOR SMART STRUCTURES SO LASER FOCUS WORLD LA English DT Article RP FRIEBELE, EJ (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 3 TC 8 Z9 9 U1 0 U2 1 PU PENNWELL PUBL CO PI NASHUA PA 5TH FLOOR TEN TARA BOULEVARD, NASHUA, NH 03062-2801 SN 0740-2511 J9 LASER FOCUS WORLD JI Laser Focus World PD MAY PY 1994 VL 30 IS 5 BP 165 EP & PG 0 WC Optics SC Optics GA NK624 UT WOS:A1994NK62400034 ER PT J AU ASKINS, CG AF ASKINS, CG TI FIBEROPTIC SENSOR ARRAYS EMERGE READYMADE FROM DRAW TOWER SO LASER FOCUS WORLD LA English DT Article RP ASKINS, CG (reprint author), USN,RES LAB,OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU PENNWELL PUBL CO PI NASHUA PA 5TH FLOOR TEN TARA BOULEVARD, NASHUA, NH 03062-2801 SN 0740-2511 J9 LASER FOCUS WORLD JI Laser Focus World PD MAY PY 1994 VL 30 IS 5 BP 237 EP 238 PG 2 WC Optics SC Optics GA NK624 UT WOS:A1994NK62400042 ER PT J AU LAU, RC SQUIRE, J BRISSON, L KAMELREID, S GRUNBERGER, T DUBE, I LETARTE, M SHANNON, K FREEDMAN, MH AF LAU, RC SQUIRE, J BRISSON, L KAMELREID, S GRUNBERGER, T DUBE, I LETARTE, M SHANNON, K FREEDMAN, MH TI LYMPHOID BLAST CRISIS OF B-LINEAGE PHENOTYPE WITH MONOSOMY-7 IN A PATIENT WITH JUVENILE CHRONIC MYELOGENOUS LEUKEMIA (JCML) SO LEUKEMIA LA English DT Note ID CHRONIC GRANULOCYTIC-LEUKEMIA; CHRONIC MYELOMONOCYTIC LEUKEMIA; CHRONIC MYELOID-LEUKEMIA; CELLS; CHILDHOOD; CHILDREN; PRECURSORS; DISEASE; CULTURE; NEUROFIBROMATOSIS AB We studied a patient with juvenile chronic myelogenous leukemia (JCML) whose terminal course was characterized by transformation to acute lymphoblastic leukemia. Karyotypic studies identified monosomy 7 in leukemic myelomonocytic marrow cells during the chronic phase and in the lymphoblasts during the transformation phase. Our ability to sustain the transformed lymphoblasts in culture allowed us to characterize them further. CD19, HLA-DR, and CD10 were present, consistent with a pre-B acute lymphoblastic leukemia phenotype. CD14 (My-4) and CD13 (My-7) were negative. Rearrangement of immunoglobulin heavy- and light-chain genes identified monoclonal populations of cells of the B lineage. This case provides further evidence that JCML is a clonal disease of pluripotent stem-cell origin. C1 HOSP SICK CHILDREN,DIV HEMATOL ONCOL,TORONTO M5G 1X8,ON,CANADA. HOSP SICK CHILDREN,DEPT IMMUNOL,TORONTO M5G 1X8,ON,CANADA. UNIV TORONTO,DEPT PAEDIAT,TORONTO M5S 1A1,ON,CANADA. UNIV TORONTO,DEPT PATHOL,TORONTO,ON,CANADA. UNIV TORONTO,DEPT IMMUNOL,TORONTO,ON,CANADA. UNIV LAVAL,DEPT PEDIAT,QUEBEC CITY,PQ,CANADA. UNIV CALIF SAN FRANCISCO,DEPT PEDIAT,SAN FRANCISCO,CA 94143. USN HOSP,DEPT CLIN INVEST,OAKLAND,CA. OI Squire, Jeremy/0000-0002-9863-468X NR 36 TC 35 Z9 35 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0887-6924 J9 LEUKEMIA JI Leukemia PD MAY PY 1994 VL 8 IS 5 BP 903 EP 908 PG 6 WC Oncology; Hematology SC Oncology; Hematology GA NP119 UT WOS:A1994NP11900031 PM 8182949 ER PT J AU GEER, R QADRI, S SHASHIDHAR, R THIBODEAUX, AF DURAN, RS AF GEER, R QADRI, S SHASHIDHAR, R THIBODEAUX, AF DURAN, RS TI X-RAY-INVESTIGATIONS OF LANGMUIR-BLODGETT MULTILAYER FILMS OF SIDE-CHAIN LIQUID-CRYSTAL COPOLYMERS SO LIQUID CRYSTALS LA English DT Article ID SPONTANEOUS POLARIZATION; POLYMERS; POLYSILOXANES AB X-ray reflectivity studies on Langmuir Blodgett multilayer films of side-chain liquid crystal polymers are reported. The films have a high degree of lamellar order. The layer periodicity is independent of the type of monolayer deposition, implying a reorientation of the side group mesogens following the deposition process. X-ray reflectivity from thin films displays subsidiary maxima permitting a quantitative measure of the change in side-chain density between multilayer and monolayer. A unit cell density profile is calculated for thick films assuming a symmetric unit cell. C1 USN,RES LAB,CODE 6900,WASHINGTON,DC 20375. UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. NR 23 TC 13 Z9 13 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0267-8292 J9 LIQ CRYST JI Liq. Cryst. PD MAY PY 1994 VL 16 IS 5 BP 869 EP 875 DI 10.1080/02678299408027857 PG 7 WC Chemistry, Multidisciplinary; Crystallography; Materials Science, Multidisciplinary SC Chemistry; Crystallography; Materials Science GA NK325 UT WOS:A1994NK32500013 ER PT J AU RUTH, J NACIRI, J SHASHIDHAR, R AF RUTH, J NACIRI, J SHASHIDHAR, R TI FERROELECTRIC PROPERTIES OF MIXTURES OF A LIQUID-CRYSTALLINE POLYMER AND ITS SIDE-GROUP MESOGEN SO LIQUID CRYSTALS LA English DT Article ID SPONTANEOUS POLARIZATION AB We present the results of our studies of the ferroelectric properties of mixtures of a high polarization, ferroelectric liquid crystalline copolymer and its side-group antecedent, a high polarization, low molecular weight, ferroelectric mesogen. These two materials are found to be completely miscible in all proportions. Spontaneous polarization values and electro-optical response times are found to be monotonic functions of the weight percentage of the mesogen in the mixture, while optical tilt angles do not exhibit such a monotonic dependence. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375. NR 18 TC 8 Z9 8 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0267-8292 J9 LIQ CRYST JI Liq. Cryst. PD MAY PY 1994 VL 16 IS 5 BP 883 EP 892 DI 10.1080/02678299408027859 PG 10 WC Chemistry, Multidisciplinary; Crystallography; Materials Science, Multidisciplinary SC Chemistry; Crystallography; Materials Science GA NK325 UT WOS:A1994NK32500015 ER PT J AU KRASS, IA PINAR, MC THOMPSON, TJ ZENIOS, SA AF KRASS, IA PINAR, MC THOMPSON, TJ ZENIOS, SA TI A NETWORK MODEL TO MAXIMIZE NAVY PERSONNEL READINESS AND ITS SOLUTION SO MANAGEMENT SCIENCE LA English DT Article DE NAVY FLEET READINESS; NAVAL PERSONNEL ASSIGNMENT; NETWORKS WITH SIDE CONSTRAINTS; LINEAR-QUADRATIC PENALTY FUNCTIONS; HEURISTICS AB The problem of optimally (re)allocating Navy personnel to combat units is compounded by several considerations: availability of trained personnel, staffing of positions by occupation groups or ranks, and maintaining an acceptable level of readiness. In this paper we model this problem as a nonlinear nondifferentiable optimization problem. A reformulation of the nonlinear optimization problem as a network flow problem is then developed. The formulation results in a network flow problem with side constraints. An additional, nonnetwork, variable measures the readiness level. This new formulation permits the use of network optimization tools in order to solve effectively very large problems. We then develop two numerical methods for solving this problem. One method is based on a heuristic that solves (approximately) the nondifferentiable problem. The second method is based on a Linear-Quadratic Penalty (LQP) algorithm, and it exploits the embedded network structure by placing the side constraints into the objective function. The resulting nonlinear network program is solved using a simplicial decomposition of the network constraint set. Numerical results indicate the viability of this approach on problems with up to 36,000 arcs and 17,000 nodes with 3,700 side constraints. C1 TECH UNIV DENMARK,INST NUMER ANAL,DK-2800 LYNGBY,DENMARK. UNIV PENN,DEPT DECIS SCI,PHILADELPHIA,PA 19104. RP KRASS, IA (reprint author), USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92152, USA. NR 11 TC 5 Z9 5 U1 1 U2 4 PU INST OPERATIONS RESEARCH MANAGEMENT SCIENCES PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2909 SN 0025-1909 J9 MANAGE SCI JI Manage. Sci. PD MAY PY 1994 VL 40 IS 5 BP 647 EP 661 DI 10.1287/mnsc.40.5.647 PG 15 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA NW819 UT WOS:A1994NW81900010 ER PT J AU LOHRMANN, DR MORRISSETT, JG AF LOHRMANN, DR MORRISSETT, JG TI REDUCE NOISE IN MILLIMETER-WAVE RADAR RECEIVERS SO MICROWAVES & RF LA English DT Article RP LOHRMANN, DR (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU PENTON PUBL INC PI CLEVELAND PA 1100 SUPERIOR AVE, CLEVELAND, OH 44114 SN 0745-2993 J9 MICROWAVES RF JI Microw. RF PD MAY PY 1994 VL 33 IS 5 BP 59 EP & PG 0 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NN419 UT WOS:A1994NN41900006 ER PT J AU MACE, NA AF MACE, NA TI WHAT WAS JOHNSON PAID FOR 'RASSELAS' SO MODERN PHILOLOGY LA English DT Article RP MACE, NA (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0026-8232 J9 MOD PHILOLOGY JI Mod. Philol. PD MAY PY 1994 VL 91 IS 4 BP 455 EP 458 DI 10.1086/392191 PG 4 WC Language & Linguistics; Literature SC Linguistics; Literature GA NP594 UT WOS:A1994NP59400004 ER PT J AU NANOS, GP AF NANOS, GP TI PRESIDENTS PAGE SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP NANOS, GP (reprint author), USN,WASHINGTON,DC 20350, 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 MAY PY 1994 VL 106 IS 3 BP 8 EP 8 PG 1 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900001 ER PT J AU URBACH, HB GARMAN, RW KNAUSS, DT WATTS, JW DWAN, TE MITCHELL, EE HOWES, C AF URBACH, HB GARMAN, RW KNAUSS, DT WATTS, JW DWAN, TE MITCHELL, EE HOWES, C TI A STEAM-AUGMENTED GAS-TURBINE WITH REHEAT COMBUSTOR FOR SURFACE SHIPS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The steam-augmented gas turbine (SAGT) concept has attracted attention because of its benign level of NO(x) emission, its increased fuel efficiency, and significant, cost-effective increments of output power, particularly, when moisture injection is increased to levels approaching 50% of air flow. Such high levels of moisture consumption distinguish the SAGT engine from commercial steam-injected gas turbines where steam flow may be less than 15% of air flow. At the high 50% levels, the SAGT burner would operate near stoichiometric combustion ratios with specific powers exceeding 570 hp-sec/lb. In a previous study, an intercooled, steam-augmented, gas-turbine concept was examined for its applicability in the Navy's DDG-51 class ship environments, which achieves efficiencies approaching the Navy's intercooled regenerative (ICR) engine, and an impressive compactness that arises from the high specific power of steam and low air consumption. A newer SAGT engine concept, described herein, dispenses with the intercooler, but adds a low-pressure reheat combustor. At the most efficient operating points, the efficiency of this new reheat SAGT engine at 43% exceeds the efficiency of the ICR engine, while exhibiting the compactness of the previous SAGT concept. Tabular and graphical simulation data comparing the baseline engine, with the ICR and other engine simulations, show that the maximum efficiency of the new SAGT engine occurs at powers required for cruising speeds. Since a DDG operates near cruise conditions for the majority of its mission time, a SAGT plant uses less fuel than the ICR plant. Moreover, since it eliminates the intercooler, developmental work on member elements, largely derivable from off-the-shelf components, is reduced. Even with conservative cost estimates, the SAGT plant is quite competitive on a first-acquisition cost basis with the current gas turbine in the fleet. RP URBACH, HB (reprint author), USN,CTR SURFACE WARFARE,ANNAPOLIS DETACHMENT,DEPT POWER SYST,ANNAPOLIS,MD 21402, USA. NR 0 TC 1 Z9 1 U1 1 U2 1 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 MAY PY 1994 VL 106 IS 3 BP 41 EP 51 PG 11 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900003 ER PT J AU PETTERSEN, KE BIELITZ, CL CIANCI, J AF PETTERSEN, KE BIELITZ, CL CIANCI, J TI MAIN PROPULSION POWER TAKE-OFF CONFIGURATION FOR AN ETC GUN PULSED-POWER GENERATOR SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Electro-Thermal Chemical (ETC) Gun technology will increase the range and capabilities of existing CIWS and 5 inch guns. Because of their faster, yet more controllable acceleration, ETC guns will allow for the utilization of smart munitions and, in the case of the 5 inch guns, increase range to beyond 50 nautical miles. This paper examines five power take-off (PTO) gear configurations from a surface ship class main reduction gears (MRG's) which drive a nominal 10 Megawatt (MW) Pulsed Power (PP) generator. The PP generator is utilized to charge a capacitor-based pulsed forming network (PFN) which, in turn, provides an electrical pulse to the cartridge of a munition at the breech of an ETC gun upon demand. The PTO gear and resultant placement of the generator will be the major focus of this paper. Major issues that will be examined will include space constraints within the main engine and auxiliary machinery rooms, gear sizing, survivability, shock and vibration, the penetration of watertight bulkheads with high speed shafting and equipment accessibility. Also, design guidelines for the PP generator will be provided. Special emphasis will be placed on the connection of the PTO gear to the MRGs. RP PETTERSEN, KE (reprint author), USN,CTR SURFACE WARFARE,ANNAPOLIS DETACHMENT,CARDEROCK DIV,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 MAY PY 1994 VL 106 IS 3 BP 52 EP 58 PG 7 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900004 ER PT J AU DOERRY, NH DAVIS, JC AF DOERRY, NH DAVIS, JC TI INTEGRATED POWER-SYSTEM FOR MARINE APPLICATIONS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The U.S. Navy has shifted priority from designing systems that offer increased capability, to systems which are more affordable, but enable improved performance. To address the emphasis on affordability, the Advanced Surface Machinery (ASM) Programs and the Affordability Through Commonality (ATC) program are proposing ship systems composed of common modules employing standardized parts. This paper describes the Integrated Power System (IPS) which provides electrical power for both propulsion and ship service loads for a wide range of ship applications including submarines, surface combatants, aircraft carriers, amphibious ships, auxiliary ships, sealift and high value commercial ships. IPS consists of an architecture and a family of modules from which affordable and high performance configurations can be developed for the full range of ship applications. In most configurations, IPS reduces the number of prime movers and divides ships into electrical zones controlled in a modular fashion. Cost reductions are realized in acquisition, training, manning, maintenance and other logistic support areas. RP DOERRY, NH (reprint author), USN,SEA SYST COMMAND,SEA 03R2,ADV SURFACE MACHINERY PROGRAMS,WASHINGTON,DC 20350, USA. NR 0 TC 22 Z9 22 U1 0 U2 2 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 MAY PY 1994 VL 106 IS 3 BP 77 EP 90 PG 14 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900006 ER PT J AU SURKO, SW AF SURKO, SW TI AN ASSESSMENT OF CURRENT WARSHIP DAMAGED STABILITY-CRITERIA SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Current damaged stability criteria for the design of warships is outdated. The U.S. Navy criteria, consolidated in Design Data Sheet (DDS) 079-1, was developed over four decades ago, based largely on World War 11 battle damage experience. The validity of this standard is assessed with regards to the method in which it is assigned, its historical basis, and assumptions of wind and sea conditions. In general: combatant ships with a length greater than 300 feet must be able to withstand a shell opening of 15 percent along the waterline, while auxiliary ships must be able to withstand a shell opening of 12.5 percent. A warship's ability to withstand underwater damage is determined by an analysis of reserve buoyancy (floodable length) and damaged stability. A comparison of the design standards used by various navies reveals great similarities and some notable differences. Contemporary weapon threats and increased operational demands have changed the traditional ship design equation. The Ship Operational Capabilities Study has emphasized the need for modern ships to be able to fight hurt. Fortunately, a review of combatant ship model testing demonstrates that ships can be made more survivable. DDS 079-1 should be modified to incorporate some stability criteria developed by other nations, and impose more demanding environmental conditions. RP SURKO, SW (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,SHIP SYST ENGN STN,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 MAY PY 1994 VL 106 IS 3 BP 110 EP 131 PG 22 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900009 ER PT J AU WEIR, GE AF WEIR, GE TI A TRULY ALLIED UNDERTAKING - THE PROGENY OF BRITAIN EMPIRE LIBERTY 1931-1943 SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The Ocean, Fort, and Liberty ships began as a single British design, modified in cooperation with American and Canadian builders, and produced in various forms and in great numbers by Canadian, British, and American shipyards. Thus from the outset the British prototype, christened Empire Liberty, represented a truly allied collaboration to produce quickly-built, standard cargo ships. The present study will briefly explore this cooperative venture from the challanges posed by the interwar depression in the shipbuilding industry, to the selection, modification, and production of the British design in Europe and North America before and after American entry into World War II. RP WEIR, GE (reprint author), USN,CTR HIST,WASHINGTON,DC 20350, 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 MAY PY 1994 VL 106 IS 3 BP 175 EP 183 PG 9 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900013 ER PT J AU MEYER, VA AF MEYER, VA TI NAVAL SPECIAL WARFARE FUTURE CONCEPTS - THE CASE FOR OPERATIONAL MOBILITY SO NAVAL ENGINEERS JOURNAL LA English DT Article RP MEYER, VA (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,DAHLGREN,VA 22448, 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 MAY PY 1994 VL 106 IS 3 BP 184 EP 191 PG 8 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900014 ER PT J AU GRATER, GF FAGAN, S AF GRATER, GF FAGAN, S TI DESIGN CONSIDERATIONS INTEGRATING ETC GUN SYSTEMS ABOARD NAVAL SURFACE COMBATANTS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The naval surface combatant is an ideal platform for fielding emerging electric armament technologies such as Electro-Thermal Chemical (ETC) Gun Systems. ETC Gun Systems are demonstrating the capability of meeting mission requirements in Naval Surface Fire Support, Ship Self Defense and possibly Theater Missile Defense areas. However, integration of ETC Gun Systems into a surface combatant requires coordination of many Hull, Mechanical and Electrical (HM&E) technologies in conjunction with the combat system development in order to provide a cost-effective ship system. This paper addresses the design considerations for integrating a 5 inch ETC gun and two 60mm ETC guns aboard a naval surface combatant. The proposed architecture for the power system utilizes a power take-off arrangement from the main propulsion drivetrain to provide the necessary prime power. The projected mission profiles of each gun system and the resultant prime power requirements are derived. The extraction of prime power from the ship's propulsion system, power conversion, conditioning and control techniques, power transmission throughout the ship, pulse forming and energy storage requirements, system grounding and safety, and thermal management issues are then discussed. Engineering research at Naval Surface Warfare Center, Annapolis continues to confirm the feasibility of integrating ETC guns aboard naval surface combatants. RP GRATER, GF (reprint author), USN,CTR SURFACE WARFARE,ANNAPOLIS DETACHMENT,CARDEROCK DIV,ANNAPOLIS,MD 21402, USA. NR 0 TC 2 Z9 2 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 MAY PY 1994 VL 106 IS 3 BP 220 EP 227 PG 8 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900017 ER PT J AU JACOBS, KS SODERSTROM, GW AF JACOBS, KS SODERSTROM, GW TI THE MAINTENANCE REQUIREMENTS SYSTEM - RISK-BASED RESOURCE PROGRAMMING AT WORK SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The U.S. Navy has refined its Program Objective Memorandum (POM) development process to ensure that future budgets provide adequate ship maintenance funding while maintaining the proper balance between force structure and force readiness. The Maintenance Requirements System (MRS) is now the process which allows the U.S. Navy Surface Ship community to forecast and defend its requirements by articulating the potential mission impact (risk) of funding constraints. Risk is defined across many disciplines as the product of the severity of an outcome and the probability of an outcome. For maintenance, we define relative risk as the severity of system failure times the probability of system failure if a maintenance task is not performed. Any limited budget carries some risk, since some maintenance tasks will not be funded. When funding for a future availability is constrained, MRS sorts the representative maintenance tasks in descending order of risk and cuts the list based on funding. MRS then identifies the mission impact of each unfunded maintenance task. This method does not predict or dictate the actual maintenance performed on each ship in the future, but through feedback it projects the types and costs of required maintenance and provides an estimate of the impact of funding constraints. This paper outlines the basic principles of risk-based decision making, provides a detailed discussion of an actual risk-based decision making process (MRS), and suggests some other maintenance applications of risk-based decision making. RP JACOBS, KS (reprint author), USN,SEA SYST COMMANDS,DIV SURFACE SHIP MAINTENANCE,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 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 MAY PY 1994 VL 106 IS 3 BP 279 EP 284 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NG449 UT WOS:A1994NG44900022 ER PT J AU CHOUFFANI, K UBERALL, H DOUGHERTY, R FUSINA, R GENZ, H HOFFMANNSTASCHECK, P NETHING, U RICHTER, A AF CHOUFFANI, K UBERALL, H DOUGHERTY, R FUSINA, R GENZ, H HOFFMANNSTASCHECK, P NETHING, U RICHTER, A TI A COMPARATIVE-STUDY OF COHERENT BREMSSTRAHLUNG AND CHANNELING RADIATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 15th International Conference on Atomic Collisions in Solids (ICACS-15) CY JUL 26-30, 1993 CL UNIV W ONTARIO, LONDON, CANADA HO UNIV W ONTARIO ID MEV ELECTRONS AB Employing many-beam codes for transversely bound electrons moving through crystal lattices, we calculate channeling radiation (CR) and coherent bremsstrahlung (CB) intensities in the few and few-tens-of MeV region. CB is found to be of an intensity comparable to that of CR, and dominating the spectrum beyond the Lindhard angle in the form of well defined peaks. C1 CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. USN,RES LAB,WASHINGTON,DC 20375. TH DARMSTADT,INST KERNPHYS,W-6100 DARMSTADT,GERMANY. NR 8 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1994 VL 90 IS 1-4 BP 133 EP 136 DI 10.1016/0168-583X(94)95528-X PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NM766 UT WOS:A1994NM76600030 ER PT J AU DOUGHERTY, RW SAENZ, AW AF DOUGHERTY, RW SAENZ, AW TI CHANNELING RADIATION FROM QUASI-CRYSTALS - METHODS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 15th International Conference on Atomic Collisions in Solids (ICACS-15) CY JUL 26-30, 1993 CL UNIV W ONTARIO, LONDON, CANADA HO UNIV W ONTARIO ID CRYSTALS AB Recently a class of quasicrystals has been discovered experimentally which exhibit quasiperiodicity along one direction and periodicity along all others. We have numerically calculated the transverse wavefunctions and energy eigenvalue spectrum of relativistic electrons channeled by the planes perpendicular to the quasicrystal (QC) axis for a simplified model of such a one-dimensional quasicrystal. The calculations were performed by using both conventional crystal approximant techniques and, for the first time, by a direct technique which makes use of the quasicrystalline model itself. The results given by the two methods agree well with each other. These wavefunctions and eigenvalue calculational procedures are the main ingredients in the computation of the channeling radiation intensities and spectra from such channeled electrons in the considered QCs, as will be reported in a future paper. C1 CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. RP DOUGHERTY, RW (reprint author), USN,RES LAB,CONDENSED MATTER & RADIAT SCI,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 13 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1994 VL 90 IS 1-4 BP 137 EP 141 DI 10.1016/0168-583X(94)95529-8 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NM766 UT WOS:A1994NM76600031 ER PT J AU SMITH, DP GOLDMAN, SM BEGGS, DS LANIGAN, PJ AF SMITH, DP GOLDMAN, SM BEGGS, DS LANIGAN, PJ TI RENAL-CELL CARCINOMA IN PREGNANCY - REPORT OF 3 CASES AND REVIEW OF THE LITERATURE SO OBSTETRICS AND GYNECOLOGY LA English DT Note ID PATIENT; MASSES; WOMAN AB Background: Renal cell carcinoma is a potentially fatal tumor that occasionally presents during pregnancy. Based on our experience with three patients and a review of the recent cases in the literature, we believe there has been a change in presentation of this lesion over that described in previous reviews. Cases: Two of three women with renal cell carcinoma found during pregnancy had symptoms suggesting recurrent urinary tract infection. The renal tumors were all discovered by ultrasound. In addition, magnetic resonance imaging was used for preoperative, intragestational staging of one patient. Conclusion: Renal cell carcinoma should be considered in women of childbearing age who present with recurrent or refractory urinary tract symptoms, flank pain, or a palpable flank mass. Ultrasound appears to be the imaging procedure of choice for evaluating the urinary system in pregnant women. C1 JOHNS HOPKINS UNIV, JOHNS HOPKINS HOSP, SCH MED, DEPT RADIOL & RADIOL SCI, BALTIMORE, MD USA. USN, NATL MED CTR, DEPT RADIOL, BETHESDA, MD USA. UNIV TEXAS, SCH MED, DEPT RADIOL, HOUSTON, TX 77030 USA. RP SMITH, DP (reprint author), FRANCIS SCOTT KEY MED CTR, DEPT RADIOL, 4940 EASTERN AVE, BALTIMORE, MD 21224 USA. NR 11 TC 20 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0029-7844 J9 OBSTET GYNECOL JI Obstet. Gynecol. PD MAY PY 1994 VL 83 IS 5 BP 818 EP 820 PN 2 PG 3 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA NJ176 UT WOS:A1994NJ17600006 PM 8159360 ER PT J AU KRATZKE, RA OTTERSON, GA HOGG, A COXON, AB GERADTS, J COWELL, JK KAYE, FJ AF KRATZKE, RA OTTERSON, GA HOGG, A COXON, AB GERADTS, J COWELL, JK KAYE, FJ TI PARTIAL INACTIVATION OF THE RB PRODUCT IN A FAMILY WITH INCOMPLETE PENETRANCE OF FAMILIAL RETINOBLASTOMA AND BENIGN RETINAL TUMORS SO ONCOGENE LA English DT Article ID LARGE T-ANTIGEN; GENE-PRODUCT; SUSCEPTIBILITY GENE; CELLULAR PROTEINS; MOLECULAR-CLONING; BINDING PROTEIN; EXPRESSION; MUTATIONS; IDENTIFICATION; TRANSCRIPTION AB While familial retinoblastoma has served as the paradigm for the two-hit theory of tumorigenesis and for the concept of the tumor suppressor gene, the etiology of incomplete penetrance of familial retinoblastoma is poorly understood. To address the molecular basis for this phenotype we have studied the functional properties of a mutant Rb gene identified in a kindred with incomplete penetrance of familial retinoblastoma and evidence for regressed retinal lesions (retinomas). In contrast to all previously isolated RB mutant proteins, we demonstrated that the mutant product from this kindred retained the wildtype properties of nuclear localization, the ability to undergo hyperphosphorylation in vivo, and the capacity to suppress growth of RB((-)) cells. Protein binding ('pocket') activity, however, was defective defining a new class of RB mutant with partial inactivation. The presence of this unique RB mutant in the germline of obligate carriers with incomplete penetrance and regressed retinal lesions suggests a molecular basis for this phenotype and supports the hypothesis that a minimum 'RB threshold' level of protein binding activity is required to suppress tumorigenesis. C1 USN,NCI,MED ONCOL BRANCH,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20889. INST CHILD HLTH,IMPERIAL CANC RES FUND,LONDON WC1N 1EH,ENGLAND. MOLEC ONCOL INC,GAITHERSBURG,MD 20878. RI kaye, frederic/E-2437-2011; OI Cowell, John/0000-0002-2079-5950 NR 60 TC 55 Z9 56 U1 0 U2 2 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD MAY PY 1994 VL 9 IS 5 BP 1321 EP 1326 PG 6 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA NH401 UT WOS:A1994NH40100002 PM 8152792 ER PT J AU BAILEY, MP AF BAILEY, MP TI SOLVING A CLASS OF STOCHASTIC MINIMIZATION PROBLEMS SO OPERATIONS RESEARCH LA English DT Article AB This work gives a methodology for analyzing a class of discrete minimization problems with random element weights. The minimum weight solution is shown to be an absorbing state in a Markov chain, while the distribution of weight of the minimum weight element is shown to be of phase type. We then present two-sided bounds for matroids with NBUE distributed weights, as well as for weights with bounded positive hazard rates. We illustrate our method using a realistic military communications problem. RP BAILEY, MP (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 14 TC 2 Z9 2 U1 0 U2 1 PU OPERATIONS RESEARCH SOC AMER PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2920 SN 0030-364X J9 OPER RES JI Oper. Res. PD MAY-JUN PY 1994 VL 42 IS 3 BP 428 EP 438 DI 10.1287/opre.42.3.428 PG 11 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA PE066 UT WOS:A1994PE06600003 ER PT J AU TYLER, MW FITZGERALD, M DENNISON, JB HEYS, DR AF TYLER, MW FITZGERALD, M DENNISON, JB HEYS, DR TI THE EFFECT OF PULPAL FLUID-FLOW ON TENSILE BOND STRENGTH OF A GLASS-IONOMER CEMENT - AN IN-VIVO AND IN-VITRO COMPARISON SO OPERATIVE DENTISTRY LA English DT Article AB Previous studies of the bonding capabilities of glass-ionomer cements have concentrated on the use of in vitro testing conditions. Since early moisture contamination appears to have adverse effects on the physical properties of glass-ionomer cements, and with the probability of pulpally derived dentinal fluid being present under in vivo conditions, the objective of this study was to compare in vivo tensile bond strength with in vitro tensile bond strength of a glass-ionomer cement to dentin utilizing the same teeth under similar test conditions. A glass-ionomer lining cement was placed on freshly exposed labial dentin of the maxillary incisor on 10 Rhesus monkeys. Immediately following placement, an orthodontic button was placed over the cement and left undisturbed for 1 hour. The teeth were then extracted and stored in 100% relative humidity for 23 hours. An Instron testing machine was used to register in kilograms the force required to cause tensile bond failure of the cement. Identical methodology was then used on the same teeth for in vitro testing. The concluding results indicate that a statistically significant difference (P less-than-or-equal-to 0.05) exists between in vivo and in vitro tensile bond strengths of the glass-ionomer lining cement and that the bond failure was cohesive in character for all cases both in vivo and in vitro. These findings suggest that clinically, tensile bond strengths of glass-ionomer cements to cut dentin can be expected to be weaker in vital teeth than in devital teeth. RP TYLER, MW (reprint author), USN,CTR DENT,POB 147,NAVAL STN,SAN DIEGO,CA 92136, USA. NR 0 TC 11 Z9 11 U1 0 U2 0 PU UNIV WASHINGTON PI SEATTLE PA SCHOOL DENTISTRY SM-57, SEATTLE, WA 98195 SN 0361-7734 J9 OPER DENT JI Oper. Dent. PD MAY-JUN PY 1994 VL 19 IS 3 BP 116 EP 120 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA NM874 UT WOS:A1994NM87400008 PM 9028251 ER PT J AU JUSTUS, BL CAMPILLO, AJ HUSTON, AL AF JUSTUS, BL CAMPILLO, AJ HUSTON, AL TI THERMAL-DEFOCUSING SCATTERING OPTICAL LIMITER SO OPTICS LETTERS LA English DT Article ID SURFACES AB Operation of an f/5 thermal-defocusing/scattering optical limiter is described. Thermal-defocusing limiting of 6-ns-duration, 532-nm laser pulses occurs by use of the broadband-absorbing dye Nigrosin dissolved in carbon disulfide. Additional limiting due to thermally induced scattering occurs at high incident fluences (above a threshold fluence) when either surface-roughened BASF-1 glass windows are in contact with the dye solution or microscopic glass fibers are added to the liquid cell. Limiter figures of merit are improved by factors of 2 and 4, respectively, over that of a purely thermal-defocusing limiter. RP JUSTUS, BL (reprint author), USN,RES LAB,CODE 5610,WASHINGTON,DC 20375, USA. NR 14 TC 25 Z9 26 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAY 1 PY 1994 VL 19 IS 9 BP 673 EP 675 DI 10.1364/OL.19.000673 PG 3 WC Optics SC Optics GA NG981 UT WOS:A1994NG98100025 PM 19844409 ER PT J AU PRAGER, L FRENCK, RW AF PRAGER, L FRENCK, RW TI STREPTOBACILLUS-MONILIFORMIS INFECTION IN A CHILD WITH CHICKENPOX SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Note DE VARICELLA; STREPTOBACILLUS INFECTION RP PRAGER, L (reprint author), USN,MED CTR,DEPT PEDIAT & PEDIAT INFECT DIS,OAKLAND,CA 94462, USA. NR 5 TC 6 Z9 6 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0891-3668 J9 PEDIATR INFECT DIS J JI Pediatr. Infect. Dis. J. PD MAY PY 1994 VL 13 IS 5 BP 417 EP 418 PG 2 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA NL215 UT WOS:A1994NL21500018 PM 8072828 ER PT J AU GLADSTONE, IM LEVINE, RL AF GLADSTONE, IM LEVINE, RL TI OXIDATION OF PROTEINS IN NEONATAL LUNGS SO PEDIATRICS LA English DT Article DE OXIDATIVE STRESS; CARBONYL ASSAY; PROTEIN OXIDATION; OXYGEN TOXICITY; VENTILATION OF THE NEONATE ID METAL-CATALYZED OXIDATION; BRONCHOPULMONARY DYSPLASIA; GLUTAMINE-SYNTHETASE; HYDROGEN-PEROXIDE; INFANTS; INACTIVATION; ENZYMES; BRAIN; CONSEQUENCES; SECRETIONS AB Objective. To develop a method capable of quantifying the oxidative modification of proteins in pulmonary fluid obtained during routine suctioning of neonates receiving ventilation, thus providing an integrated assessment of antioxidant defenses. Design. Consecutive sample of neonates receiving ventilation. Setting. Neonatal intensive care unit. Patients. Twenty-six neonates receiving ventilation with a gestational age of 24 to 42 weeks, from whom 246 samples were collected and analyzed. Measurements and results. The carbonyl content in the lavage samples was measured by reaction with 2,4-dinitrophenylhydrazine followed by high-pressure liquid chromatography. Oxidation of proteins caused introduction of carbonyl groups into the side chains of the protein, providing a convenient and relatively specific marker of oxidative damage. On the first day of life, the initial protein-bound carbonyl for each neonate was usually low and consequently was not significantly related to birth weight, gestational age, or initial ventilatory requirements. Examination of the changes in pulmonary protein carbonyl in the first days of life revealed correlations of interest. In the first day of life, four neonates whose average inspired oxygen were < 40% showed no increase in carbonyl content, whereas four neonates whose inspired oxygen was > 40% showed an average increase in carbonyl of 51% (P < .001). Also, the need for ventilation > 3 days was correlated with elevated carbonyl in those first 3 days. The carbonyl content averaged over the first 3 days was 0.13 +/- 0.02 mol carbonyl/mol protein for the eight neonates receiving ventilation < 72 hours, whereas the nine needing longer ventilation had a carbonyl content of 0.28 +/- 0.03 mol carbonyl/mol protein (P < .05). Seven neonates were treated with dexamethasone because of ventilator dependence at 14 days of age. In these neonates, treatment was associated with a 50% reduction in carbonyl content within 48 hours (P < .02). Conclusions. Oxidative damage to pulmonary proteins can be quantitated in samples obtained during routine suctioning of neonates receiving ventilation. The amount of oxidatively modified protein may provide a quantitative assessment of oxygen toxicity and of pulmonary antioxidant defenses. C1 NHLBI,BIOCHEM LAB,BETHESDA,MD 20892. USN,NATL MED CTR,DEPT PEDIAT,BETHESDA,MD. RI Levine, Rodney/D-9885-2011 NR 38 TC 88 Z9 89 U1 0 U2 0 PU AMER ACAD PEDIATRICS PI ELK GROVE VILLAGE PA 141 NORTH-WEST POINT BLVD, ELK GROVE VILLAGE, IL 60007-1098 SN 0031-4005 J9 PEDIATRICS JI Pediatrics PD MAY PY 1994 VL 93 IS 5 BP 764 EP 768 PG 5 WC Pediatrics SC Pediatrics GA NJ374 UT WOS:A1994NJ37400012 PM 8165075 ER PT J AU SHOPE, TR GARRETT, AL WAECKER, NJ AF SHOPE, TR GARRETT, AL WAECKER, NJ TI MYCOBACTERIUM-BOVIS SPINAL EPIDURAL ABSCESS IN A 6-YEAR-OLD BOY WITH LEUKEMIA SO PEDIATRICS LA English DT Note ID DIAGNOSIS; CHILDREN C1 USN,CTR MED,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN,MED CTR,DEPT PEDIAT,SAN DIEGO,CA. NR 24 TC 10 Z9 11 U1 0 U2 0 PU AMER ACAD PEDIATRICS PI ELK GROVE VILLAGE PA 141 NORTH-WEST POINT BLVD, ELK GROVE VILLAGE, IL 60007-1098 SN 0031-4005 J9 PEDIATRICS JI Pediatrics PD MAY PY 1994 VL 93 IS 5 BP 835 EP 837 PG 3 WC Pediatrics SC Pediatrics GA NJ374 UT WOS:A1994NJ37400029 PM 8165092 ER PT J AU RAO, AS ARORA, OP PANDE, CS AF RAO, AS ARORA, OP PANDE, CS TI SUPERCONDUCTIVITY IN Y-BA-CU-O/AL COMPOSITE SYSTEM SO PHYSICA C LA English DT Article AB Metal-superconductor (Y-Ba-Cu-O) systems have been prepared and characterized by resistivity measurements. We obtained unusual resistivity results in a system consisting of randomly mixed aluminum and YBa2Cu3O6+x powders which was made compact and annealed at 400-degrees-C for 30 min. It was found that in composites containing aluminum in the range 59-61 wt.% the resistivity profile was that of a superconductor. In addition to a superconducting transition temperature around 90 K, an additional partial ''transition'' around 130 K was noted. Both transition temperatures were dependent on the applied current. These results were found to be specific to aluminum composites; they were not observed in other metal-superconductor systems such as those containing silver. C1 USN,RES LAB,WASHINGTON,DC 20375. RP RAO, AS (reprint author), USN,CTR SURFACE WARFARE,ANNAPOLIS,MD 21402, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAY 1 PY 1994 VL 224 IS 3-4 BP 221 EP 227 DI 10.1016/0921-4534(94)90257-7 PG 7 WC Physics, Applied SC Physics GA NK193 UT WOS:A1994NK19300003 ER PT J AU HAFTEL, MI MANDELZWEIG, VB AF HAFTEL, MI MANDELZWEIG, VB TI NONVARIATIONAL CALCULATION OF THE RELATIVISTIC, FINITE-SIZE, AND QED CORRECTIONS FOR THE 2 S-1 EXCITED-STATE OF THE HELIUM ATOM SO PHYSICAL REVIEW A LA English DT Article ID HYPERSPHERICAL-HARMONIC METHOD; POSITRONIUM NEGATIVE-ION; VARIATIONAL CALCULATIONS; LAMB SHIFTS; EXPANSION; MU AB Relativistic and QED corrections are calculated by using a direct solution of the Schrodinger equation for the 2(1)S excited state of the helium atom obtained with the correlation-function hyperspherical-harmonic method. Our extremely accurate nonvariational results for relativistic, QED, and finite-size corrections coincide exactly (up to 0.00003 cm-1) with the values obtained in precision variational calculations of Drake [Nucl. Instrum. Methods Phys. Res. B 5, 2207 (1988)] and Baker, Hill, and Morgan [in Relativistic, Quantum Electrodynamic and Weak Interaction Effects in Atoms, edited by Walter Johnson, Peter Mohr, and Joseph Sucher, AIP Conf. Proc. No. 189 (AIP, New York, 1989), p. 123] for both infinite and finite nuclear masses. This confirms that a discrepancy of 0.0033 cm-1 between theory and experiment is not a result of an inaccuracy of variational wave functions, but is rooted in our inadequate knowledge of the QED operators. A better understanding of the different QED contributions to the operators (such as, for example, a more precise estimate of the Bethe logarithm) is therefore needed to explain the discrepancy. C1 UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP HAFTEL, MI (reprint author), USN,RES LAB,CODE 6651,WASHINGTON,DC 20375, USA. NR 28 TC 9 Z9 9 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY PY 1994 VL 49 IS 5 BP 3338 EP 3343 DI 10.1103/PhysRevA.49.3338 PN A PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NL385 UT WOS:A1994NL38500026 ER PT J AU HAFTEL, MI MANDELZWEIG, VB AF HAFTEL, MI MANDELZWEIG, VB TI NONVARIATIONAL CALCULATION OF THE RELATIVISTIC AND FINITE-SIZE CORRECTIONS FOR THE HELIUM GROUND-STATE SO PHYSICAL REVIEW A LA English DT Article ID HYPERSPHERICAL-HARMONIC METHOD; POSITRONIUM NEGATIVE-ION; VARIATIONAL CALCULATIONS; ANNIHILATION RATE; LAMB SHIFTS; EXPANSION; SYSTEMS; MU AB Relativistic and finite-size corrections are calculated by using an accurate direct solution of the Schrodinger equation [the correlation function hyperspherical harmonic (CFHH) method] for the ground state of the helium atom. In the CFHH method the solution is a product of a correlation function and of a smooth factor expanded into hyperspherical harmonic functions. Given the proper correlation function, chosen from physical considerations, the method generates wave functions, accurate in the whole range of interparticle distances, which leads in turn to precise estimates of the relativistic operators. Our nonvariational results are compared with those obtained in recent variational calculations. C1 UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP HAFTEL, MI (reprint author), USN,RES LAB,CODE 6651,WASHINGTON,DC 20375, USA. NR 33 TC 8 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY PY 1994 VL 49 IS 5 BP 3344 EP 3350 DI 10.1103/PhysRevA.49.3344 PN A PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NL385 UT WOS:A1994NL38500027 ER PT J AU PULSIFER, P APRUZESE, JP DAVIS, J KEPPLE, P AF PULSIFER, P APRUZESE, JP DAVIS, J KEPPLE, P TI RESIDUAL ENERGY AND ITS EFFECT ON GAIN IN A LYMAN-ALPHA LASER SO PHYSICAL REVIEW A LA English DT Article ID FIELD-INDUCED IONIZATION; ABOVE-THRESHOLD IONIZATION; X-RAY LASERS; PLASMAS; PULSES AB To examine prospects for gain in a Lyman-alpha recombination laser driven by a high-intensity, short-pulse laser, we calculate the residual energy in both hydrogen and helium during recombination after the ionizing pulse. The expected pin as a function of residual energy and density is then separately evaluated. The residual energy calculation includes above-threshold ionization (ATI) in the presence of a background plasma, as well as inverse-bremsstrahlung heating. At electron densities over 10(18) cm-3 but below critical density, the plasma reduces the ATI energy by approximately a factor of 2, but without a previously reported dependence on the pulse width. Inverse-bremsstrahlung heating can be significant, but is not dominant for the parameters considered. Detailed recombination-laser gain calculations were performed for the Ly-alpha transitions of both H and He, using Stark profiles to represent the laser line cross section. To obtain gain of near 2 cm-1 lasting at least a few ps, the H plasma temperature must be less than 3.5 eV and electron density between 4 X 10(17) and 4 X 10(18) cm-3; for He, the temperature must be less than 15 eV and the electron density between 2 x 10(18) and 2 X 10(19) CM-3. Our calculations indicate that these conditions can be satisfied for H, if the driving laser intensity is above 4 X 10(14) W cm-2, and for He, if the laser intensity is above 1. 7 X 10(16) W cm-2 and the wavelength is below 0.6 mum. RP PULSIFER, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,RADIAT HYDRODYNAM BRANCH,WASHINGTON,DC 20375, USA. NR 20 TC 25 Z9 25 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY PY 1994 VL 49 IS 5 BP 3958 EP 3965 DI 10.1103/PhysRevA.49.3958 PN B PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NL386 UT WOS:A1994NL38600017 ER PT J AU LILL, JV BROUGHTON, JQ AF LILL, JV BROUGHTON, JQ TI ATOMISTIC SIMULATIONS INCORPORATING NONLINEAR ELASTICITY - SLOW-STRESS RELAXATION AND SYMMETRY-BREAKING SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS METHOD; CANONICAL ENSEMBLE; STATISTICAL ENSEMBLES; ANISOTROPIC SOLIDS; SYSTEMS; TRANSITIONS; EQUATIONS; MOTION; SHAPE; FLUCTUATIONS AB Complementary molecular-dynamics and Metropolis Monte Carlo algorithms for the atomistic simulation of crystals with imposed laboratory conditions of temperature and tensorial pressure are presented. Inclusion of the nonlinear expression for the elastic energy of a crystal yields simulations that conserve the Gibbs potential of the crystal despite finite deformations. The molecular-dynamics equations of motion contain an explicit expression of the virial theorem for nonlinear elastic media; the dynamical balance of the ''internal'' and ''external'' pressures includes the elastic response of the system to the applied stress. Thus the ''internal'' and ''external'' pressures remain in dynamical equilibrium even when the microscopic dynamics generate a phase transformation and the initial isotropy of the macroscopic stress field is broken. Deterministic molecular-dynamics trajectories for a simple pair-potential model of a pressure-induced martensitic transformation are presented; manifestly nonlinear behavior is observed while satisfying the tensorial virial theorem for nonlinear elastic media. Stochastic Monte Carlo trajectories yield comparable results, and independently verify the nonlinear extension of the virial theorem. This is despite the fact that the Monte Carlo algorithm contains no explicit driving terms that insure the theorem be satisfied. RP USN, RES LAB, COMPLEX SYST THEORY BRANCH, CODE 6692, WASHINGTON, DC 20375 USA. NR 36 TC 14 Z9 14 U1 0 U2 3 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 MAY 1 PY 1994 VL 49 IS 17 BP 11619 EP 11633 DI 10.1103/PhysRevB.49.11619 PG 15 WC Physics, Condensed Matter SC Physics GA NL643 UT WOS:A1994NL64300009 ER PT J AU SINGH, DJ PAPACONSTANTOPOULOS, DA AF SINGH, DJ PAPACONSTANTOPOULOS, DA TI MAGNETIC AND ELECTRONIC-STRUCTURE OF COH SO PHYSICAL REVIEW B LA English DT Article ID BRILLOUIN-ZONE; SPECIAL POINTS AB Local-spin-density-approximation calculations of the magnetic and electronic properties of CoH are reported. In its ground state CoH is found to be a strong ferromagnet with a moment of approximately 1.16mu(B) and a magnetic energy of 10.1 mRy/fu. The magnetic properties and their relationship to those of Co are discussed in terms of the electronic structure. The large moment in CoH is explained in terms of proton-induced hybridization of the electronic states. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 23 TC 6 Z9 6 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 MAY 1 PY 1994 VL 49 IS 18 BP 12801 EP 12804 DI 10.1103/PhysRevB.49.12801 PG 4 WC Physics, Condensed Matter SC Physics GA NM433 UT WOS:A1994NM43300044 ER PT J AU KIM, CC SKELTON, EF QADRI, SB BROWNING, VM OSOFSKY, MS REEVES, ME LIEBENBERG, DH AF KIM, CC SKELTON, EF QADRI, SB BROWNING, VM OSOFSKY, MS REEVES, ME LIEBENBERG, DH TI VOLUME DEPENDENCE OF THE SUPERCONDUCTING TRANSITION-TEMPERATURE FOR THE HIGH-TEMPERATURE SUPERCONDUCTOR HGBA2CUO4+DELTA SO PHYSICAL REVIEW B LA English DT Article ID PRESSURE-DEPENDENCE; SINGLE-CRYSTALS; 6 GPA; TC; ENHANCEMENT; SYSTEM; 150-K; T(C) AB The homologous series HgBa2Can-1CunO2n+2+delta (n = 1, 2,3,4) are the newest and most promising of the layered high-T(c) superconducting materials, as demonstrated in setting the highest T(c) among the known superconducting materials. The first of its series, HgBa2CuO4+delta, contains only one Cu-O plane per unit cell and is superconducting with T(c) about 94 K. The superconducting transition temperature as a function of pressure, T(c)(P), was measured to 4.5 GPa. T(c) was determined from ac susceptibility measurements and pressure was determined near T(c) from shifts in ruby fluorescence peaks. T(c) increases monotonically with dT(c)(P)/dP almost-equal-to 1.8 K/GPa at ambient pressure. The volume as a function of pressure, V(P), was measured to 10 GPa. The lattice parameters were determined by energy-dispersive x-ray-diffraction methods and pressure was determined from shifts in ruby fluorescence peaks. The volume decreases monotonically producing an isothermal bulk modulus B(V) = 104 +/- 17 GPa at ambient pressure. Both results were combined to produce T(c)(V), which is more readily compared to theoretical models. C1 USN, RES LAB, DIV MAT SCI & ENGN, WASHINGTON, DC 20375 USA. GEORGE WASHINGTON UNIV, DEPT PHYS, WASHINGTON, DC 20052 USA. OFF NAVAL RES, ARLINGTON, VA 22217 USA. RP KIM, CC (reprint author), USN, RES LAB, DIV CONDENSED MATTER & RADIAT SCI, WASHINGTON, DC 20375 USA. RI Osofsky, Michael/A-1050-2010 NR 30 TC 4 Z9 4 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 MAY 1 PY 1994 VL 49 IS 18 BP 13075 EP 13081 DI 10.1103/PhysRevB.49.13075 PG 7 WC Physics, Condensed Matter SC Physics GA NM433 UT WOS:A1994NM43300079 ER PT J AU ABARBANEL, HDI KATZ, RA GALIB, T CEMBROLA, J FRISON, TW AF ABARBANEL, HDI KATZ, RA GALIB, T CEMBROLA, J FRISON, TW TI NONLINEAR-ANALYSIS OF HIGH-REYNOLDS-NUMBER FLOWS OVER A BUOYANT AXISYMMETRICAL BODY SO PHYSICAL REVIEW E LA English DT Article ID TURBULENT BOUNDARY-LAYER; STRANGE ATTRACTORS; INFORMATION; DIMENSION; CHAOS AB Data from experiments on the turbulent boundary layer around an axisymmetric vehicle rising under its own buoyancy are described in detail and analyzed using tools developed in nonlinear dynamics. Arguments are given that in this experiment the size of the wall mounted pressure sensors would make the data sensitive to the dynamics of about ten or so coherent structures in the turbulent boundary layer. Analysis of a substantial number of large, well sampled data sets indicates that the (integer) dimension of the embedding space required to capture the dynamics of the observed flows in the laminar regime is very large. This is consistent with there being no pressure fluctuations expected here and the signal being dominated by instrumental ''noise.'' In a consistency check we find that data from the ambient state of the vehicle before buoyant rise occurs and data from an accelerometer mounted in the prow are also consistent with this large dimension. The time scales in those data are also unrelated to fluid dynamic phenomena. In the transition and turbulent regions of the flow we find the pressure fluctuation time scales to be consistent with those of the fluid flow (about 250 musec) and determine the dimension required for embedding the data to be about 7-8 for the transitional region and about 8-9 for the turbulent regime. These results are examined in detail using both global and local false nearest-neighbor methods as well as mutual information aspects of the data. The results indicate that the pressure fluctuations are determined in these regimes by the coherent structures in the turbulent boundary layer. Applications and further investigations suggested by these results are discussed. C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,MARINE PHYS LAB,LA JOLLA,CA 92093. USN,UNDERSEA WARFARE CTR DETACHMENT,NEW LONDON,CT 06320. USN,UNDERSEA WARFARE CTR,NEWPORT,RI 02841. RANDLE INC,GREAT FALLS,VA 22066. RP ABARBANEL, HDI (reprint author), UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,DEPT PHYS,MAIL CODE 0402,LA JOLLA,CA 92093, USA. NR 20 TC 10 Z9 10 U1 0 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 MAY PY 1994 VL 49 IS 5 BP 4003 EP 4018 DI 10.1103/PhysRevE.49.4003 PN A PG 16 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NN994 UT WOS:A1994NN99400060 ER PT J AU FELDMAN, U AF FELDMAN, U TI THE PLASMA PROPERTIES OF THE SOLAR UPPER-ATMOSPHERE DETERMINED FROM HIGH-RESOLUTION OBSERVATIONS AND THE NATURE OF THE PHYSICAL PROCESSES SUSTAINING IT SO PHYSICS OF PLASMAS LA English DT Review ID X-RAY-SPECTRA; UNRESOLVED FINE-STRUCTURES; ELECTRON-DENSITY; TEMPERATURE REGION; XUV OBSERVATIONS; 105 K; FLARES; EMISSION; LINES; DIAGNOSTICS AB Half a century ago, it was established that the temperature of the ''quiescent'' solar corona is almost-equal-to 10(6) K (almost-equal-to 100 eV). Wave theories have been used to explain the means by which the Sun keeps the corona about 200 times hotter than the 5000 K (almost-equal-to 0.5 eV) photosphere. In recent years, it has been suggested that a mechanism other than wave dissipation heats the ''quiescent'' corona and other transient phenomena that occur in the upper solar atmosphere. It is postulated by some that the solar upper atmosphere is heated by small bursts of energy resulting from magnetic reconnection. In this paper, the plasma properties of the upper solar atmosphere, a domain that, when flares are included, encompasses about three orders of magnitude in temperature (3 X 10(4)-3 X 10(7) K) and four orders of magnitude in electron density (3 X 10(8)-3 X 10(12) cm-3), are described. It is shown that conventional scenarios based on magnetic reconnections may not adequately explain the observed plasma properties of the solar upper atmosphere. However, a model, consisting of electric currents flowing along magnetic field lines may have a better chance simulating the observed properties. For quiescent solar upper atmosphere phenomena, constant currents are needed to simulate the observations, while for flares, currents supplied by an exponentially decaying storage media are required. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 47 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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD MAY PY 1994 VL 1 IS 5 BP 1390 EP 1402 DI 10.1063/1.870689 PN 2 PG 13 WC Physics, Fluids & Plasmas SC Physics GA NK072 UT WOS:A1994NK07200003 ER PT J AU YOUNG, FC HUBBARD, RF LAMPE, M NERI, JM OTTINGER, PF STEPHANAKIS, SJ SLINKER, SP HINSHELWOOD, DD ROSE, DV OLSON, CL WELCH, DR AF YOUNG, FC HUBBARD, RF LAMPE, M NERI, JM OTTINGER, PF STEPHANAKIS, SJ SLINKER, SP HINSHELWOOD, DD ROSE, DV OLSON, CL WELCH, DR TI INTERACTION OF INTENSE MEV LIGHT-ION BEAMS WITH LOW-PRESSURE GASES SO PHYSICS OF PLASMAS LA English DT Article; Proceedings Paper CT 35th Annual Meeting of the Division-of-Plasma-Physics of the American-Physical-Society CY NOV 01-05, 1993 CL ST LOUIS, MO SP AMER PHYS SOC, DIV PLASMA PHYS ID PLASMA AB The interaction of intense proton beams with low-pressure (0.25 to 4 Torr) background gases is studied to evaluate beam-current neutralization during transport. Electrons to neutralize the beam are provided by beam-induced ionization of the gas. In experiments with 1 MeV, 1 kA/cm2 protons, net currents outside the beam envelope and electron densities within the beam envelope are measured for helium, neon, argon, and air. Net-current fractions are 2% to 8% and ionization fractions are 0.6% to 5% for 5 to 7 kA beams. Simulations of the experiments for helium and argon suggest that fast electrons play an important role in generating a significant fraction of the return current in a halo outside the beam. As a result, net currents inside the beam may be larger than inferred from magnetic-field measurements outside the beam. Ions at the head of the beam are observed to lose more energy than expected from collisional energy losses in the background gas. C1 JAYCOR INC,VIENNA,VA 22182. SANDIA NATL LABS,ALBUQUERQUE,NM 87165. MISSION RES CORP,ALBUQUERQUE,NM 87106. RP YOUNG, FC (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 25 TC 16 Z9 16 U1 0 U2 0 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 MAY PY 1994 VL 1 IS 5 BP 1700 EP 1708 DI 10.1063/1.870673 PN 2 PG 9 WC Physics, Fluids & Plasmas SC Physics GA NK072 UT WOS:A1994NK07200041 ER PT J AU MANHEIMER, WM AF MANHEIMER, WM TI GYROTRONS AND FREE-ELECTRON LASERS AS ATMOSPHERIC SENSORS SO PHYSICS OF PLASMAS LA English DT Article; Proceedings Paper CT 35th Annual Meeting of the Division-of-Plasma-Physics of the American-Physical-Society CY NOV 01-05, 1993 CL ST LOUIS, MO SP AMER PHYS SOC, DIV PLASMA PHYS ID QUASI-OPTICAL GYROTRON; GHZ GYROTRON; OPERATION; RADAR AB Gyrotrons and free electron lasers have recently increased both the power and tunability of, respectively, millimeter wave and infrared sources by several orders of magnitude. As radiation at these wavelengths interact strongly with atmospheric aerosols and trace impurities, these sources have a great potential as atmospheric sensors. They open the possibility of increasing by at least an order of magnitude both the range and sensitivity of these atmospheric sensors. RP MANHEIMER, WM (reprint author), USN,PLASMA PHYS LAB,CODE 6707,WASHINGTON,DC 20375, USA. NR 28 TC 6 Z9 6 U1 0 U2 0 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 MAY PY 1994 VL 1 IS 5 BP 1721 EP 1729 DI 10.1063/1.870676 PN 2 PG 9 WC Physics, Fluids & Plasmas SC Physics GA NK072 UT WOS:A1994NK07200044 ER PT J AU KRALL, J ESAREY, E SPRANGLE, P JOYCE, G AF KRALL, J ESAREY, E SPRANGLE, P JOYCE, G TI PROPAGATION OF RADIUS-TAILORED LASER-PULSES OVER EXTENDED DISTANCES IN A UNIFORM PLASMA SO PHYSICS OF PLASMAS LA English DT Article; Proceedings Paper CT 35th Annual Meeting of the Division-of-Plasma-Physics of the American-Physical-Society CY NOV 01-05, 1993 CL ST LOUIS, MO SP AMER PHYS SOC, DIV PLASMA PHYS ID WAKE-FIELD GENERATION; BEAT-WAVE ACCELERATOR AB A Maxwell-fluid model is described, which allows simulation of laser pulses over extended distances (multiple diffraction lengths) in an underdense plasma. This model is used to simulate radius-tailored laser pulses, which can propagate over such distances with minimal distortion in a uniform plasma. Theoretical model equations governing the choice of radius tailoring are also given. A radius-tailored pulse has constant power approximately equal to the critical power for relativistic guiding over the length of the pulse and a spot size at focus that varies over the length of the pulse. A laser pulse configuration of this type can be constructed from a series of ultrashort Gaussian pulses. RP KRALL, J (reprint author), USN,RES LAB,DIV BIOPHYS SCI,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 38 TC 36 Z9 37 U1 0 U2 0 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 MAY PY 1994 VL 1 IS 5 BP 1738 EP 1744 DI 10.1063/1.870678 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA NK072 UT WOS:A1994NK07200046 ER PT J AU COLE, DA MAXWELL, SE ARVEY, R SALAS, E AF COLE, DA MAXWELL, SE ARVEY, R SALAS, E TI HOW THE POWER OF MANOVA CAN BOTH INCREASE AND DECREASE AS A FUNCTION OF THE INTERCORRELATIONS AMONG THE DEPENDENT-VARIABLES SO PSYCHOLOGICAL BULLETIN LA English DT Article ID MULTIVARIATE-ANALYSIS; SIGNIFICANCE TESTS; RELIABILITY; DESYNCHRONY; PARADOX; FEAR AB This article directly addresses explicit contradictions in the literature regarding the relation between the power of multivariate analysis of variance (MANOVA) and the intercorrelations among the dependent variables. Artificial data sets, as well as analytical methods, revealed that (a) power increases as correlations between dependent variables with large consistent effect sizes (that are in the same direction) move from near 1.0 toward - 1.0, (b) power increases as correlations become more positive or more negative between dependent variables that have very different effect sizes (i.e., one large and one negligible), and (c) power increases as correlations between dependent variables with negligible effect sizes shift from positive to negative (assuming that there are dependent variables with large effect sizes still in the design). Implications for the reliability of dependent variables and strategies for selecting these variables in MANOVA designs are discussed. C1 UNIV MINNESOTA,DEPT PSYCHOL,MINNEAPOLIS,MN 55455. USN,TRAINING SYST CTR,ORLANDO,FL. RP COLE, DA (reprint author), UNIV NOTRE DAME,DEPT PSYCHOL,NOTRE DAME,IN 46556, USA. RI Rohlf, F/A-8710-2008 NR 27 TC 39 Z9 39 U1 0 U2 7 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0033-2909 J9 PSYCHOL BULL JI Psychol. Bull. PD MAY PY 1994 VL 115 IS 3 BP 465 EP 474 DI 10.1037//0033-2909.115.3.465 PG 10 WC Psychology; Psychology, Multidisciplinary SC Psychology GA NL116 UT WOS:A1994NL11600007 ER PT J AU HAYS, DW AF HAYS, DW TI QUALITY IMPROVEMENT AND ITS ORIGIN IN SCIENTIFIC MANAGEMENT SO QUALITY PROGRESS LA English DT Article RP HAYS, DW (reprint author), USN BRANCH MED CLIN,INGELSIDE,TX, USA. NR 0 TC 2 Z9 2 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 MAY PY 1994 VL 27 IS 5 BP 89 EP 90 PG 2 WC Engineering, Multidisciplinary; Engineering, Industrial; Management; Operations Research & Management Science SC Engineering; Business & Economics; Operations Research & Management Science GA NK015 UT WOS:A1994NK01500022 ER PT J AU HUES, SM DRAPER, CF LEE, KP COLTON, RJ AF HUES, SM DRAPER, CF LEE, KP COLTON, RJ TI EFFECT OF PZT AND PMN ACTUATOR HYSTERESIS AND CREEP ON NANOINDENTATION MEASUREMENTS USING FORCE MICROSCOPY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SCANNING TUNNELING MICROSCOPY; CALIBRATION; CERAMICS; STM AB Nanoindentation measurements performed using the atomic force microscope (AFM) are significantly affected, both with regard to indentation curve shape and quantitative values of the measurements (70% variation in measured modulus), by the well-known effects of hysteresis and creep in the lead zirconate titanate (PZT) piezoceramic actuators used to control the positioning and motion of the mechanical components of the AFM. A capacitance-based displacement calibrator has been built and it was discovered that the response of PZT ceramics may vary (up to 66%) depending upon the conditions under which the piezoceramic is calibrated. By replacing the PZT actuators with lead magnesium niobate (PMN) electrostrictive actuators, nanoindentation measurements have been obtained using the AFM that are both reproducible and quantitative. C1 VANDERBILT UNIV,DEPT MECH ENGN,NASHVILLE,TN 37205. GEO CENTERS INC,FT WASHINGTON,MD 20744. RP HUES, SM (reprint author), USN,RES LAB,CODE 6170,WASHINGTON,DC 20375, USA. NR 16 TC 53 Z9 54 U1 1 U2 7 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 MAY PY 1994 VL 65 IS 5 BP 1561 EP 1565 DI 10.1063/1.1144892 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NM231 UT WOS:A1994NM23100013 ER PT J AU SANTANGELO, PG ROLAND, CM AF SANTANGELO, PG ROLAND, CM TI THE MECHANICAL-BEHAVIOR OF DOUBLE NETWORK ELASTOMERS SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article ID RUBBER DOUBLE NETWORKS; ENTANGLEMENT NETWORKS; CROSS-LINKING; ELASTICITY; STRAIN; STATES; MODEL; EXTENSION; POLYMER AB It was found that at low residual strains, the modulus of double network rubbers can be less than that of anisotropic elastomer of equal crosslink density. At higher residual strains, the equilibrium modulus is higher for the double network. This aspect of the behavior of networks was investigated using two phenomenological descriptions of rubber elasticity, the Mooney-Rivlin (MR)1 and the Roth, Martin, and Stiehler (RMS)2 Equations. Calculations using either approach, which make use of the independent network hypothesis, were qualitatively in agreement with the experimental data. The tensile strength of double networks based on natural rubber were found to be independent of the amount of residual strain. This is true even at higher residual strains, wherein the modulus is significantly amplified. This suggests that the conventional compromise between modulus and failure properties can be circumvented using double network rubbers. Their utilization can yield elastomers of better mechanical properties. RP SANTANGELO, PG (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 34 TC 26 Z9 26 U1 2 U2 10 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 MAY-JUN PY 1994 VL 67 IS 2 BP 359 EP 365 DI 10.5254/1.3538681 PG 7 WC Polymer Science SC Polymer Science GA NT409 UT WOS:A1994NT40900014 ER PT J AU CARLSON, JT AF CARLSON, JT TI IUSS COMMUNITY ADOPTS COLLATERAL USES SO SEA TECHNOLOGY LA English DT Article RP CARLSON, JT (reprint author), USN,UNDERSEA SURVEILLANCE PACIFIC COMMAND,HONOLULU,HI, USA. NR 1 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 MAY PY 1994 VL 35 IS 5 BP 25 EP 28 PG 4 WC Engineering, Ocean SC Engineering GA NL436 UT WOS:A1994NL43600005 ER PT J AU DANDRIDGE, A COGDELL, GB AF DANDRIDGE, A COGDELL, GB TI FIBER OPTIC SENSORS - PERFORMANCE, RELIABILITY, SMALLNESS SO SEA TECHNOLOGY LA English DT Article C1 USN,RES LAB,FIBER OPT TECHNOL PROGRAM,WASHINGTON,DC 20375. RP DANDRIDGE, A (reprint author), USN,RES LAB,OPT SENSOR SECT,WASHINGTON,DC 20375, 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 MAY PY 1994 VL 35 IS 5 BP 31 EP & PG 0 WC Engineering, Ocean SC Engineering GA NL436 UT WOS:A1994NL43600006 ER PT J AU ROCKSTAD, HK KENNY, TW REYNOLDS, JK KAISER, WJ GABRIELSON, TB AF ROCKSTAD, HK KENNY, TW REYNOLDS, JK KAISER, WJ GABRIELSON, TB TI A MINIATURE HIGH-SENSITIVITY BROAD-BAND ACCELEROMETER BASED ON ELECTRON-TUNNELING TRANSDUCERS SO SENSORS AND ACTUATORS A-PHYSICAL LA English DT Article; Proceedings Paper CT 7th International Conference on Solid-State Sensors and Actuators (Transducers 93) CY JUN 07-10, 1993 CL YOKOHAMA, JAPAN ID DETECTOR; SENSORS; NOISE AB New high sensitivity microsensors have been developed using high-resolution position sensors based on electron tunneling. The design of miniature accelerometers having resolutions approaching 10(-9) g/square-root Hz is discussed. A new dual-element electron tunneling structure, which overcomes bandwidth limitations of single-element structures, allows design of high sensitivity accelerometers operating in a band from a few Hz to several kHz. A miniature accelerometer based on this structure can thus have application as a sensitive acoustic sensor. Thermal vibration of the proof mass is an extremely important constraint in miniature accelerometers, and can be the dominant limitation on the sensitivity. Thermal noise is analyzed for the suspended masses of the dual-element structure, and compared with electronic noise in the tunneling circuit. With a proof mass of 100 mg noise analysis predicts limiting resolutions better than 10(-8) g/square-root Hz between 10 and 100 Hz, and 10(-7) g/square-root Hz at 1 kHz. Prototype accelerometers have been fabricated by silicon micromachining and tested. A noise resolution of 10(-7) g/square-root Hz between 4 and 70 Hz and 6 x 10(-7) g/square-root Hz at 400 Hz is observed in a damped device. The low-frequency responsivity of this device is 100000 V/g, decreasing to 1300 V/g at 600 Hz. C1 USN,CTR AIR WARFARE,WARMINSTER,PA 18974. RP ROCKSTAD, HK (reprint author), JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,PASADENA,CA 91109, USA. NR 22 TC 26 Z9 30 U1 3 U2 12 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0924-4247 J9 SENSOR ACTUAT A-PHYS JI Sens. Actuator A-Phys. PD MAY PY 1994 VL 43 IS 1-3 BP 107 EP 114 DI 10.1016/0924-4247(93)00676-U PG 8 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA NT267 UT WOS:A1994NT26700018 ER PT J AU MULLEN, B ANTHONY, T SALAS, E DRISKELL, JE AF MULLEN, B ANTHONY, T SALAS, E DRISKELL, JE TI GROUP COHESIVENESS AND QUALITY OF DECISION-MAKING - AN INTEGRATION OF TESTS OF THE GROUPTHINK HYPOTHESIS SO SMALL GROUP RESEARCH LA English DT Article ID SALIENCE AB This article reports the results of a mete-analytic integration of the effects of group cohesiveness on quality of decision making in groups. Overall, there was no significant effect of cohesiveness on the quality of group decisions. However more cohesive groups rendered poorer quality decisions when additional antecedent conditions of groupthink were present (directive leadership). In addition, the component of cohesiveness that appears to be critical for the emergence of groupthink is interpersonal attraction: Cohesiveness impaired decision quality more as the operationalization of cohesiveness entailed more interpersonal attraction, and less as the operationalization entailed more commitment to task or group pride. Finally, more cohesive groups did render poorer quality decisions as group size increased Discussion considers the implications of these results for future research the relation between cohesiveness and quality of decision making in particular, and on groupthink in general. C1 ROLLINS COLL,WINTER PK,FL 32789. USN,CTR TRAINING SYST,ORLANDO,FL. RP MULLEN, B (reprint author), SYRACUSE UNIV,DEPT PSYCHOL,SYRACUSE,NY 13244, USA. NR 39 TC 59 Z9 63 U1 4 U2 42 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1046-4964 J9 SMALL GR RES JI Small Group Res. PD MAY PY 1994 VL 25 IS 2 BP 189 EP 204 DI 10.1177/1046496494252003 PG 16 WC Psychology, Applied; Management; Psychology, Social SC Psychology; Business & Economics GA NF837 UT WOS:A1994NF83700003 ER PT J AU RAMESHAM, R ROSE, MF ASKEW, RF BEKKER, TL DAYTON, JA KRAINSKY, IL MEARINI, G FILE, D GILMOUR, AS AYRES, V AF RAMESHAM, R ROSE, MF ASKEW, RF BEKKER, TL DAYTON, JA KRAINSKY, IL MEARINI, G FILE, D GILMOUR, AS AYRES, V TI EFFECT OF HYDROGEN ON THE PROPERTIES OF POLYCRYSTALLINE DIAMOND THIN-FILMS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article ID SECONDARY-ELECTRON EMISSION; RESISTIVITY; CARBON; GROWTH AB Microwave plasma-assisted chemical vapor deposition has been used to grow undoped and doped diamond on molybdenum and silicon substrates. Current-voltage (I-V), characteristics, secondary electron emission and depth profiles for various elements by secondary ion mass spectrometry of diamond films have been measured before and after annealing in nitrogen gas at 425-degrees-C. We have analyzed the films for morphology and chemical nature by scanning electron microscopy and Raman spectroscopy respectively. Hydrogen present in the as-deposited diamond films resulted in a decrease in the electrical resistivity and an increase in secondary electron yield. Furthermore, we have observed an increase in resistivity and decrease in yield on annealing. Comparison of these results is presented in this paper. C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. USN,CTR SURFACE WARFARE,PORT HUENEME,CA. USN,CTR SURFACE WARFARE,CRANE,IN. SUNY BUFFALO,BUFFALO,NY 14260. USN,CTR SURFACE WARFARE,DAHLGREN,VA 22448. RP RAMESHAM, R (reprint author), AUBURN UNIV,INST SPACE POWER,231 LEACH CTR,AUBURN,AL 36849, USA. NR 17 TC 9 Z9 9 U1 0 U2 0 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 MAY PY 1994 VL 64 IS 2 BP 81 EP 86 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA NN237 UT WOS:A1994NN23700004 ER PT J AU BAWDEN, M MALONE, J SLATEN, D AF BAWDEN, M MALONE, J SLATEN, D TI QBC(R) MALARIA DIAGNOSIS - EASILY LEARNED AND EFFECTIVELY APPLIED IN A TEMPORARY MILITARY FIELD LABORATORY SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Note C1 UNIFORMED SERV UNIV HLTH SCI,MIL TRAINING NETWORK,BETHESDA,MD 20814. USN,NATL MED CTR,BETHESDA,MD. USN,ENVIRONM PREVENTAT MED UNIT 2,BETHESDA,MD. NR 3 TC 3 Z9 3 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 MAY-JUN PY 1994 VL 88 IS 3 BP 302 EP 302 DI 10.1016/0035-9203(94)90089-2 PG 1 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA NX711 UT WOS:A1994NX71100017 PM 7974669 ER PT J AU HIBBS, RG KAMAL, M FARID, Z AF HIBBS, RG KAMAL, M FARID, Z TI ABDOMINAL TUBERCULOSIS IN CAIRO, EGYPT SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID EXPERIENCE AB Twenty-two abdominal tuberculosis patients seen at Abbassia Fever Hospital in Cairo, Egypt from January 1990 to August 1992 are described; their mean age was 21.5 years, range 9-54 years; 17 were female. Common symptoms were fever, malaise, abdominal pain (64%) and weight loss (82%). Chest X-rays were normal in 14 patients (64%), but ultrasonography/computerized tomography of the abdomen was abnormal in 20 patients (91%), with adenopathy the usual finding. Anaemia and a raised erythrocyte sedimentation rate were present in all patients, and purified protein derivative skin test (5 Tu) was positive in 82%. Predominant abnormal physical findings were abdominal (86%), including hepatomegaly/splenomegaly and abdominal mass. Diagnosis was made from biopsy material (caseating granulomas) in 6 patients by laparotomy, 1 by laparoscopy, and 3 by cervical or supraclavicular node biopsy; and from laboratory examination of excretions in only 4 patients (acid-fast bacilli in stools of 2, mycobacteria in urine and menstrual fluid). Eight patients required presumptive diagnosis after response to specific isoniazid (+ethambutol) antituberculous therapy. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. ABBASSIA FEVER HOSP,MINIST PUBL HLTH,CAIRO,EGYPT. NR 9 TC 9 Z9 9 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 MAY-JUN PY 1994 VL 88 IS 3 BP 317 EP 318 DI 10.1016/0035-9203(94)90099-X PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA NX711 UT WOS:A1994NX71100024 PM 7974676 ER PT J AU GLICKSMAN, ME MIZENKO, LM RETTENMAYER, ME MARSH, SP AF GLICKSMAN, ME MIZENKO, LM RETTENMAYER, ME MARSH, SP TI DENDRITIC SOLIDIFICATION OF UNDERCOOLED MELTS - MUSHY ZONE RECALESCENCE DYNAMICS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT NATO Advanced Research Workshop on Undercooled Metallic Melts: Properties, Solidification and Metastable Phases CY JUN 06-12, 1993 CL IL CIOCCO CENTRO INT SPA, IL CIOCCO, ITALY SP NATO, SCI AFFAIRS DIV, EUROPEAN SPACE AGCY, NASA, GERMAN AEROSP RES ESTAB, GERMAN SPACE AGCY, CNR, DORNIER GMBH HO IL CIOCCO CENTRO INT SPA AB The nucleation and growth of crystals in deeply undercooled melts leads to rapid dendritic growth accompanied by recalescence. The recalescence temperature provides an internal degree of freedom if the thermodynamic system is closed to all energy and mass transfers over relevant observational time scales. Precision adiabatic recalescence experiments on both pure and binary undercooled melts were conducted. The adiabatic constraint limits the amount of net phase transformation from the metastable undercooled state, and also sets bounds on the microstructural parameters of the mushy zone, i.e. the volume fraction of the phases, their length scales, and the interfacial compositions. As many as three distinct kinetic time scales are observed in these experiments: (1) a short time scale (ca. less than 1 s) of rapidly increasing temperature from the initial nucleation temperature, associated with propagation of the dendrites and release of latent heat; (2) an intermediate time scale (ca. 10(3)-10(4) S) of slowly rising temperature, associated with coarsening of the mushy zone; (3) a long time scale (ca. days) of steadily falling temperature, associated with solid-state diffusional adjustments near the solid-liquid interface. Interpretation of these experiments is provided in an attempt to understand the overall process of non-equilibrium freezing of undercooled alloy melts. C1 TECH UNIV DARMSTADT,DEPT MAT SCI,D-64287 DARMSTADT,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. RP GLICKSMAN, ME (reprint author), RENSSELAER POLYTECH INST,DEPT MAT ENGN,TROY,NY 12180, USA. OI Glicksman, Martin/0000-0002-2675-2759 NR 10 TC 9 Z9 9 U1 1 U2 4 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 APR 30 PY 1994 VL 178 IS 1-2 BP 137 EP 146 DI 10.1016/0921-5093(94)90532-0 PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA NH615 UT WOS:A1994NH61500025 ER PT J AU BARONAVSKI, AP OWRUTSKY, JC AF BARONAVSKI, AP OWRUTSKY, JC TI LIFETIME OF THE S(3) STATE OF CS2 MEASURED BY FEMTOSECOND ULTRAVIOLET MULTIPHOTON IONIZATION SPECTROSCOPY SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ABSORPTION SPECTRUM; ENERGY-DISTRIBUTION; 193 NM; PREDISSOCIATION; TRANSITION; DYNAMICS AB The lifetime of the S3 State of CS2 at 205 nm has been directly measured using femtosecond ultraviolet 1 + 1 multiphoton ionization spectroscopy. Excitation pulses in the deep UV are produced by third harmonic generation of amplified CPM pulses. The lifetime of the S3 (or A) state at 205 nm is measured to be 600 +/- 100 fs. This is compared to previous indirect lifetime measurements for this state. RP BARONAVSKI, AP (reprint author), USN,RES LAB,DIV CHEM,CODE 6111,WASHINGTON,DC 20375, USA. RI Owrutsky, Jeffrey/K-7649-2012 NR 29 TC 30 Z9 32 U1 0 U2 4 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 APR 29 PY 1994 VL 221 IS 5-6 BP 419 EP 425 DI 10.1016/0009-2614(94)00280-0 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NJ120 UT WOS:A1994NJ12000015 ER PT J AU MERRITT, TA BOYNTON, BR HALLMAN, M AF MERRITT, TA BOYNTON, BR HALLMAN, M TI VIABILITY OF INFANTS BORN AT 22 TO 25 WEEKS GESTATION SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter C1 USN HOSP,SAN DIEGO,CA 92134. UNIV CALIF IRVINE,IRVINE,CA 92717. RP MERRITT, TA (reprint author), UNIV CALIF DAVIS,SACRAMENTO,CA 95817, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD APR 28 PY 1994 VL 330 IS 17 BP 1234 EP 1235 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA NG586 UT WOS:A1994NG58600013 PM 8139637 ER PT J AU NI, YP FITZGERALD, JP CARROLL, P WAYLAND, BB AF NI, YP FITZGERALD, JP CARROLL, P WAYLAND, BB TI FORMATION AND REACTIVITY OF (OCTAETHYLTETRAAZAPORPHYRINATO)RHODIUM COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID RHODIUM(II) OCTAETHYLPORPHYRIN DIMER; CARBON-MONOXIDE; IRON PORPHYRINS; RH-RH; ACTIVATION; CHEMISTRY; FORMYL; PHTHALOCYANINES; <(OEP)RH>2; METHANE AB A series of (octaethyltetraazaporphyrinato)rhodium, (OETAP)Rh, complexes including (OETAP)Rh-1, (OETAP)-Rh-CH3, and [(OETAP)Rh]2 were prepared for comparison with the corresponding (octaethylporphyrinato)-rhodium, (OEP)Rh, derivatives. [(OETAP)Rh]2 (1) reacts like [(OEP)Rh]2 (2) with CH3I, CH3NC, (CH3O)3P, and CH2=CH2 in forming (OETAP)Rh-CH3 and (OETAP)Rh-I, (OETAP)Rh(CN)(CH3NC), (OETAP)Rh-P(O)(OCH3)2, and (OETAP)Rh-CH2CH2-Rh(OETAP), respectively, but reactions of 1 are invariably much slower than those of 2. [(OETAP)Rh]2 fails to react with H-2, CO, CH3CHO, and CH3C6H5, which participate in prominent substrate reactions for 2. Reactivity and equilibrium studies indicate that a substantially larger Rh-Rh bond dissociation enthalpy for 1 compared with 2 is primarily responsible for the slower rates and reduced scope of substrate reactions for [(OETAP)Rh]2. Dissolution of 1 in pyridine results in formation of a persistent OETAP anion radical complex of Rh(III), (OETAP.-)Rh(III)(py)2, which contrasts with 2 where disproportionation produces the(OEP)Rh(I) anion and the (OEP)Rh(III)(py)2 cation. (OETAP)Rh-CH3 (RhC33H43N8) crystalllzes in the monoclinic system, space group P2(1)/c, with a = 9.889(2) angstrom, b = 22.660(4) angstrom, c = 14.781(3) angstrom, beta = 106.85(2)degrees, and Z = 4. The X-ray crystal and molecular structure determination for (OETAP)Rh-CH3 reveals a smaller hole size and corresponding shorter Rh-N distances for the (OETAP)Rh derivative but virtually identical Rh-CH3 bond distances in comparison with (OEP)Rh-CH3. Differences in the structures and reactivities of (OETAP)Rh and (OEP)Rh complexes are discussed in terms of the smaller hole size, lower energy of the pi* orbitals, and the doming of the OETAP ligand. C1 UNIV PENN,DEPT CHEM,PHILADELPHIA,PA 19104. USN ACAD,ANNAPOLIS,MD 21402. NR 37 TC 44 Z9 44 U1 0 U2 28 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD APR 27 PY 1994 VL 33 IS 9 BP 2029 EP 2035 DI 10.1021/ic00087a045 PG 7 WC Chemistry, Inorganic & Nuclear SC Chemistry GA NJ344 UT WOS:A1994NJ34400045 ER PT J AU WILLIAMSON, DH GARDNER, MJ PREISER, P MOORE, DJ RANGACHARI, K WILSON, RJM AF WILLIAMSON, DH GARDNER, MJ PREISER, P MOORE, DJ RANGACHARI, K WILSON, RJM TI THE EVOLUTIONARY ORIGIN OF THE 35 KB CIRCULAR DNA OF PLASMODIUM-FALCIPARUM - NEW EVIDENCE SUPPORTS A POSSIBLE RHODOPHYTE ANCESTRY SO MOLECULAR AND GENERAL GENETICS LA English DT Note DE MALARIA; PLASMODIUM FALCIPARUM; PLASTID EXTRACHROMOSOMAL DNA ID MALARIA PARASITES; CHLOROPLASTS; ORGANIZATION; APICOMPLEXA; GENOMES AB In common with other Apicomplexan parasites, Plasmodium falciparum carries two extrachromosomal DNAs, one of which, the 6 kb element, is undoubtedly mitochondrial. The second, generally referred to as the 35 kb circle, is of unknown provenance, but the nature and organization of its genetic content makes a mitochondrial association unlikely and the molecule has features reminiscent of plastid genomes. We now report the occurrence on the circle of an open reading frame specifying a predicted 470 amino acid protein that shares more than 50% identity with a gene currently known only on the plastome of red algae. This high degree of conservation confirms the 35 kb circle's plastid ancestry, and we speculate that it may have originated from the rhodoplast of an ancient red algal endosymbiont in the progenitor of the Apicomplexa. C1 USN, MED RES INST, MALARIA PROGRAM, ROCKVILLE, MD 20852 USA. RP NATL INST MED RES, RIDGEWAY, MILL HILL, LONDON NW7 1AA, ENGLAND. RI Preiser, Peter /A-2201-2011; OI , Peter/0000-0003-4331-7000 FU Medical Research Council [MC_U117532072] NR 22 TC 102 Z9 108 U1 1 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0026-8925 J9 MOL GEN GENET JI Mol. Gen. Genet. PD APR 27 PY 1994 VL 243 IS 2 BP 249 EP 252 PG 4 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA NJ566 UT WOS:A1994NJ56600015 PM 8177222 ER PT J AU KYONO, CS IKOSSIANASTASIOU, K RABINOVICH, WS BOWMAN, SR KATZER, DS TSAO, AJ AF KYONO, CS IKOSSIANASTASIOU, K RABINOVICH, WS BOWMAN, SR KATZER, DS TSAO, AJ TI GAAS/ALGAAS MULTIQUANTUM-WELL RESONANT PHOTOREFRACTIVE DEVICES FABRICATED USING EPITAXIAL LIFT-OFF SO APPLIED PHYSICS LETTERS LA English DT Article ID MULTIPLE QUANTUM-WELLS; GAAS; ABSORPTION; FILMS AB This letter deals with resonant photorefractive devices fabricated from multiquantum wells of GaAs/Al0.3Ga0.7As and operated in a quantum-confined Stark effect geometry. Details of the processing are presented. Epitaxial lift-off was used to remove the active device from the substrate. Low-temperature Al0.3Ga.07As was used as an insulator to form metal-insulator-semiconductor structures on both sides of the multiquantum wells. Proton implant damage was used to improve the fringe visibility. Photorefractive wave mixing with a diffraction efficiency of approximately 0.03% was demonstrated. The incorporation of a nitride layer between the top electrode and the low-temperature AlGaAs increased the efficiency to 0.5%. The improvement is attributed to a reduction in the conduction of carriers across the low-temperature layer into the electrode. C1 UNIV TEXAS,AUSTIN,TX 78712. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. RP KYONO, CS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 16 TC 20 Z9 20 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 APR 25 PY 1994 VL 64 IS 17 BP 2244 EP 2246 DI 10.1063/1.111658 PG 3 WC Physics, Applied SC Physics GA NH390 UT WOS:A1994NH39000019 ER PT J AU CHEEK, GT OGRADY, WE AF CHEEK, GT OGRADY, WE TI MEASUREMENT OF H/D UPTAKE CHARACTERISTICS AT PALLADIUM USING A QUARTZ-CRYSTAL MICROBALANCE SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID HYDROGEN ABSORPTION; SEPARATION; MASS AB Frequency measurements at AT- and BT-cut crystals have been carried out for electrolytic loading of palladium films with H and D from 0.10 M LiOH + H2O (0.10 M LiOD + D2O) solutions. The results at BT-cut crystals have shown that film stressing occurs during the early part of H or D deposition and that this stressing is largely reversible upon removal of hydrogen species. In experiments involving addition of H2O to D2O solutions, it has been found that deposition of H into the palladium film is favored over that of D and that H uptake occurs exclusively at H2O levels above 10%, although these experiments have been carried out at much lower current densities than is typical for these investigations. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CHEEK, GT (reprint author), USN ACAD,DEPT CHEM,STOP 9B,572 HOLLOWAY RD,ANNAPOLIS,MD 21402, USA. NR 22 TC 17 Z9 17 U1 0 U2 4 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 APR 25 PY 1994 VL 368 IS 1-2 BP 133 EP 138 DI 10.1016/0022-0728(93)03079-5 PG 6 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA NK414 UT WOS:A1994NK41400015 ER PT J AU NGAI, KL ROLAND, CM AF NGAI, KL ROLAND, CM TI JUNCTION DYNAMICS AND THE ELASTICITY OF NETWORKS SO MACROMOLECULES LA English DT Article ID RUBBER ELASTICITY; POLYMER NETWORKS; CHAIN DYNAMICS; FLUCTUATIONS; RELAXATION; CONSTRAINTS; THERMODYNAMICS AB The restrictions on the configurations available to the cross-link junctions of a network, arising from its presence in a dense phase, have a well-established effect on the mechanical properties of elastomers. These constraints give rise to intermolecular cooperativity of the junction motions and hence can be well described by models of constraint dynamics in relaxation phenomena. This connection between junction dynamics and elasticity of networks is illustrated by comparing the predictions of the coupling model of relaxation with the constrained junction model of Flory. The comparison is borne out by recent P-31 NMR results on networks. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 51 TC 50 Z9 50 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD APR 25 PY 1994 VL 27 IS 9 BP 2454 EP 2459 DI 10.1021/ma00087a014 PG 6 WC Polymer Science SC Polymer Science GA NJ226 UT WOS:A1994NJ22600014 ER PT J AU TAKIMOTO, CH KLECKER, RW DAHUT, WL YEE, LK STRONG, JM ALLEGRA, CJ GREM, JL AF TAKIMOTO, CH KLECKER, RW DAHUT, WL YEE, LK STRONG, JM ALLEGRA, CJ GREM, JL TI ANALYSIS OF THE ACTIVE LACTONE FORM OF 9-AMINOCAMPTOTHECIN IN PLASMA USING SOLID-PHASE EXTRACTION AND HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY SO JOURNAL OF CHROMATOGRAPHY B-BIOMEDICAL APPLICATIONS LA English DT Article ID XENOGRAFTS; CAMPTOTHECIN; INHIBITION; CANCER; MICE AB We have developed a sensitive HPLC assay to quantitate the active lactone form of 9-aminocamptothecin (9AC) in human plasma over the concentration range 10-0.25 nM (0.091 ng/ml). Solid-phase extraction separated 9AC lactone from its less active metabolite, 9AC carboxylate, allowing samples to be stored for up to two months prior to reversed-phase HPLC analysis. An acidic (pH 2.55) isocratic HPLC mobile phase was used to enhance 9AC fluorescence resulting in an over 50-fold increase in assay sensitivity compared to previous methods. This assay was able to measure steady-state 9AC lactone concentrations even at the lowest dose level of 9AC used in our Phase I clinical trial. C1 US FDA,CTR DRUG EVALUAT & RES,OFF RES RESOURCES,DIV CLIN PHARMACOL,ROCKVILLE,MD 20850. RP TAKIMOTO, CH (reprint author), USN,NATL MED CTR,NCI,DIV CANC TREATMENT,MED ONCOL BRANCH,BETHESDA,MD 20889, USA. NR 9 TC 60 Z9 61 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4347 J9 J CHROMATOGR B JI J. Chromatogr. B-Biomed. Appl. PD APR 22 PY 1994 VL 655 IS 1 BP 97 EP 104 DI 10.1016/0378-4347(94)00051-4 PG 8 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA NJ139 UT WOS:A1994NJ13900013 PM 8061838 ER PT J AU SCHULTZ, KI KOCHER, DG DALEY, JA THERIAULT, JR SPINKS, J FISHER, S AF SCHULTZ, KI KOCHER, DG DALEY, JA THERIAULT, JR SPINKS, J FISHER, S TI SATELLITE VIBRATION MEASUREMENTS WITH AN AUTODYNE CO2-LASER RADAR SO APPLIED OPTICS LA English DT Article DE AUTODYNE; DOPPLER; LASER-RADAR; SATELLITE; VIBRATION AB Vibration signatures of the Low Power Atmospheric Compensation Experiment satellite were obtained with a ground-based CO2 laser radar. The laser radar operated in a cw mode and used autodyne receivers to extract relative target velocity information between a germanium retroreflector located at the base of the satellite and a retroreflector array located at the tip of an extended forward boom. Time-frequency analysis algorithms were applied to the vibration data to investigate the correlation between excitations and modal structure. The resultant analysis suggests that vibration modes of an on-orbit spacecraft can be suppressed with simple open-loop techniques. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP SCHULTZ, KI (reprint author), MIT, LINCOLN LAB, LEXINGTON, MA 02173 USA. NR 4 TC 15 Z9 17 U1 2 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 20 PY 1994 VL 33 IS 12 BP 2349 EP 2355 PG 7 WC Optics SC Optics GA NF491 UT WOS:A1994NF49100015 PM 20885585 ER PT J AU COOK, JW KEENAN, FP BHATTA, AK AF COOK, JW KEENAN, FP BHATTA, AK TI THE ALLOWED LINES OF O-IV NEAR 1340-ANGSTROM IN HIGH ELECTRON-DENSITY SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN, FLARES; SUN, UV RADIATION ID RESOLUTION; EMISSION; SUN AB Intersystem lines of O IV near 1400 Angstrom have long been used as electron density diagnostics for solar plasmas at temperatures of around 160,000 K. In addition, however, several allowed lines of O IV near 1340 a should become visible in conditions of high plasma electron number density (>10(12) cm(-3)), such as during a solar flare. We present observations of the 1340 Angstrom and 1400 Angstrom regions of the solar spectrum for two solar flares, obtained by the SO82B spectrograph on board Skylab. We examine three candidate lines for allowed O IV in the flare spectra which occur at the correct wavelengths, but show that two of these are actually blends dominated by resonantly excited molecular lines of H-2. The third candidate line, at 1343.51 Angstrom, we identify as the O IV allowed line. We present the density and temperature sensitivity of the ratio of allowed and intersystem O IV lines R = I(1343.51 Angstrom)/I(1407.39 Angstrom). The 1343.51 Angstrom line is clearly present in the first solar flare spectrum, and the ratio value implies an electron density of log N-e = 12.6. The second flare has a much weaker 1343.51 Angstrom profile, but again the ratio value implies a high electron density. Both these electron density values are in good agreement with estimates for each flare from independent diagnostic ratios. The simple presence alone of a clearly observed O IV 1343.51 Angstrom emission line implies an electron density greater than 10(12) cm(-3). C1 QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. RP COOK, JW (reprint author), USN,RES LAB,CODE 7663,WASHINGTON,DC 20375, USA. NR 22 TC 4 Z9 4 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 APR 20 PY 1994 VL 425 IS 2 BP 861 EP 864 DI 10.1086/174032 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PM579 UT WOS:A1994PM57900042 ER PT J AU VANDYK, SD SRAMEK, RA WEILER, KW HYMAN, SD VIRDEN, RE AF VANDYK, SD SRAMEK, RA WEILER, KW HYMAN, SD VIRDEN, RE TI THE RADIO COUNTERPART TO THE LUMINOUS X-RAY SUPERNOVA REMNANT IN NGC-6946 SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL; NGC 6946; RADIO CONTINUUM, GALAXIES; RADIO CONTINUUM, ISM; SUPERNOVA REMNANTS ID NEARBY GALAXIES; EMISSION AB We report detection from VLA observations of the radio counterpart to the very luminous X-ray and optical supernova remnant in the galaxy NGC 6946 (Schlegel 1994; Blair and Fesen 1994). We find it to be a very luminous radio source, being similar to 3 times more powerful than Cas A and within an order of magnitude of the extraordinarily powerful supernova remnant in NGC 4449. We suggest that the NGC 6946 supernova remnant is analogous to the NGC 4449 supernova remnant, but is probably much older. The high luminosity at radio wavelengths for the NGC 6946 supernova remnant likely results from interaction with a dense local environment. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. SWEET BRIAR COLL,DEPT PHYS,SWEET BRIAR,VA 24595. OI Van Dyk, Schuyler/0000-0001-9038-9950 NR 14 TC 19 Z9 20 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 APR 20 PY 1994 VL 425 IS 2 BP L77 EP L79 DI 10.1086/187314 PN 2 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA PM580 UT WOS:A1994PM58000005 ER PT J AU THOMAS, AG MURYN, CA HARDMAN, PJ DURR, HA OWEN, IW THORNTON, G QUINN, FM ROSENBERG, RA LOVE, PJ REHN, V AF THOMAS, AG MURYN, CA HARDMAN, PJ DURR, HA OWEN, IW THORNTON, G QUINN, FM ROSENBERG, RA LOVE, PJ REHN, V TI SOFT-X-RAY PHOTON-STIMULATED ION DESORPTION FROM SRTIO3(100)-H2O SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 13th European Conference on Surface Science (ECOSS-13) CY AUG 30-SEP 04, 1993 CL UNIV WARWICK, ARTS CTR, WARWICK, ENGLAND SP BRIT VACUUM COUNCIL, EUROPEAN PHYS SOC, INT UNION VACUUM SCI TECH & APPL, INST PHYS, THIN FILMS & SURFACES GRP HO UNIV WARWICK, ARTS CTR AB With the aim of identifying OH bond sites, the yield of photodesorbed ions from stepped SrTiO3(100)-H2O has been monitored through the Sr N2,3, 0 L1, Ti M2,3 and Sr M4,5 X-ray absorption edges. Only the Ti M2,3 data provide an unambiguous result, evidencing Ti-OH species. An intramolecular OH mechanism appears to dominate the ion yield in the vicinity of the Sr N2,3 and 0 L1 edges, and we cannot rule out a majority XESD (X-ray induced electron stimulated desorption) contribution to the ion, yield at the Sr M4,5 edge. C1 UNIV MANCHESTER, INTERDISCIPLINARY RES CTR SURFACE SCI, MANCHESTER M13 9PL, LANCS, ENGLAND. USN, CTR WEAP, DIV PHYS, MICHELSON LAB, CHINA LAKE, CA 93555 USA. UNIV MANCHESTER, DEPT CHEM, MANCHESTER M13 9PL, LANCS, ENGLAND. SERC, DARESBURY LAB, WARRINGTON WA4 4AD, CHESHIRE, ENGLAND. RI Rosenberg, Richard/K-3442-2012; Durr, Hermann/F-6205-2012; OI Thomas, Andrew/0000-0002-1900-6686 NR 11 TC 3 Z9 3 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR 20 PY 1994 VL 307 BP 355 EP 359 DI 10.1016/0039-6028(94)90418-9 PN A PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NH824 UT WOS:A1994NH82400059 ER PT J AU BODNAR, JW KILLIAN, J AF BODNAR, JW KILLIAN, J TI COMPUTER IDENTIFICATION OF DNA REGULATORY SEQUENCES IN ANONYMOUS EUKARYOTIC DNA-SEQUENCES SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN ACAD,ANNAPOLIS,MD 21402. NORTHEASTERN UNIV,BOSTON,MA 02115. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD APR 19 PY 1994 VL 8 IS 7 BP A1445 EP A1445 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA NH516 UT WOS:A1994NH51601298 ER PT J AU FREITAS, JA KLEIN, PB COLLINS, AT AF FREITAS, JA KLEIN, PB COLLINS, AT TI EVIDENCE OF DONOR-ACCEPTOR PAIR RECOMBINATION FROM A NEW EMISSION BAND IN SEMICONDUCTING DIAMOND SO APPLIED PHYSICS LETTERS LA English DT Article ID CATHODOLUMINESCENCE; LUMINESCENCE AB Steady state and time resolved photoluminescence studies of type IIb boron-doped synthetic diamond reveal a new broad red emission band that exhibits many of the features of classic donor-acceptor pair recombination. This recombination is thought to be between an as-yet unidentified neutral donor, possibly nitrogen related, approximately 3.6 eV below the conduction band edge and neutral boron acceptors at 0.37 eV above the valence band edge. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV LONDON KINGS COLL,DEPT PHYS,LONDON WC2R 2LS,ENGLAND. NR 15 TC 15 Z9 15 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 APR 18 PY 1994 VL 64 IS 16 BP 2136 EP 2138 DI 10.1063/1.111710 PG 3 WC Physics, Applied SC Physics GA NG495 UT WOS:A1994NG49500032 ER PT J AU CHU, W FOSTER, KW SHIREY, LM RHEE, KW KOSAKOWSKI, J ISAACSON, IP MCCARTHY, D EDDY, CR DOBISZ, EA MARRIAN, CRK PECKERAR, MC AF CHU, W FOSTER, KW SHIREY, LM RHEE, KW KOSAKOWSKI, J ISAACSON, IP MCCARTHY, D EDDY, CR DOBISZ, EA MARRIAN, CRK PECKERAR, MC TI REACTIVE ION ETCHING OF HIGH-ASPECT-RATIO 100 NM LINEWIDTH FEATURES IN TUNGSTEN SO APPLIED PHYSICS LETTERS LA English DT Article ID X-RAY MASKS; ELECTRON-BEAM LITHOGRAPHY; SYSTEM AB The subtractive patterning of fine-linewidth (sub-250-nm) tungsten absorbers for x-ray masks requires the ability to etch features with high aspect ratios and vertical sidewalls. In this letter, a reactive-ion-etching process which meets these requirements is described. The etch gases used are SF6 and H-2. It is further shown that an intermittent etch process, whereby the sample is vented to atmosphere in between etches results in an etch profile with vertical tungsten sidewalls. This interrupted etching is compared with the results from continuous etching. The straighter sidewalls in the case of the interrupted etch suggests a passivation of the sidewalls which occurs during the venting process. Results are presented to show etching of 100 nm gratings and 200 nm dot arrays. An in situ endpoint detection method developed for the reactive-ion-etching system is presented. C1 USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. RI Shirey, Loretta/B-3164-2013 OI Shirey, Loretta/0000-0003-2600-3405 NR 11 TC 5 Z9 5 U1 0 U2 6 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 APR 18 PY 1994 VL 64 IS 16 BP 2172 EP 2174 DI 10.1063/1.111666 PG 3 WC Physics, Applied SC Physics GA NG495 UT WOS:A1994NG49500044 ER PT J AU SNOW, AW ARMISTEAD, JP AF SNOW, AW ARMISTEAD, JP TI A SIMPLE DILATOMETER FOR THERMOSET CURE SHRINKAGE AND THERMAL-EXPANSION MEASUREMENTS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID RESINS AB A simple capillary and bulb mercury dilatometer designed for specific volume measurements on thermoset resin systems during the curing reaction and as a function of temperature is described. The design, calibration, operation, data treatment, and error analysis are presented in detail, with data on the bisphenol A dicyanate resin system used as an example. Particular attention is directed at experimental difficulties such as monomer/prepolymer degassing, filling the dilatometer under vacuum, adhesive distortion of the curing resin on the dilatometer bulb, and the dilatometer bulb to capillary connection problem. (C) 1994 John Wiley & Sons, Inc. RP SNOW, AW (reprint author), USN,RES LAB,DEPT NAVY,CODE 6120,DIV CHEM,WASHINGTON,DC 20375, USA. NR 13 TC 23 Z9 23 U1 2 U2 3 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD APR 18 PY 1994 VL 52 IS 3 BP 401 EP 411 DI 10.1002/app.1994.070520305 PG 11 WC Polymer Science SC Polymer Science GA NA981 UT WOS:A1994NA98100005 ER PT J AU PROKES, SM AF PROKES, SM TI HOT PAPERS - PHYSICS - SIHX EXCITATION - AN ALTERNATE MECHANISM FOR POROUS SI PHOTOLUMINESCENCE BY PROKES,S.M., GLEMBOCKI,O.J., BERMUDEZ,V.M., KAPLAN,R., FRIEDERSDORF,L.E., SEARSON,P.C. SO SCIENTIST LA English DT Article AB HOT PAPERS: Sharka M. Prokes discusses her paper on porous silicon as an optoelectronic material; Ed Masteller discusses his long-term investigation of aquatic insects in a tropical rainforest. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD APR 18 PY 1994 VL 8 IS 8 BP 16 EP 16 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA NF393 UT WOS:A1994NF39300013 ER PT J AU GRAY, GC MITCHELL, BS TUELLER, JE CROSS, ER AMUNDSON, DE AF GRAY, GC MITCHELL, BS TUELLER, JE CROSS, ER AMUNDSON, DE TI PNEUMONIA HOSPITALIZATIONS IN THE US NAVY AND MARINE CORPS - RATES AND RISK-FACTORS FOR 6,522 ADMISSIONS, 1981-1991 SO AMERICAN JOURNAL OF EPIDEMIOLOGY LA English DT Article DE MILITARY MEDICINE; MYCOPLASMA PNEUMONIAE; PNEUMONIA; STREPTOCOCCUS PNEUMONIAE ID COMMUNITY-ACQUIRED PNEUMONIA; UNITED-STATES-ARMY; YOUNG-ADULTS; PENICILLIN-G; INFECTION; ETIOLOGY; PNEUMOCOCCUS; PROPHYLAXIS; BENZATHINE; PREVENTION AB The authors identified hospitalizations for pneumonia (n = 6,522) in active-duty Navy and Marine Corps personnel during 1981-1991 from computerized inpatient records. The crude mean annual rate of pneumonia hospitalization was 77.6 per 100,000 active-duty personnel; 65% of pneumonia hospitalizations had no etiologic agent identified. The most commonly reported agents to cause pneumonia hospitalization were Streptococcus pneumoniae (12.3%), Mycoplasma pneumoniae (10.8%), other streptococcal species (2.1%), and Haemophilus influenzae (1.9%). The median age at hospitalization was 22 years. The median duration of hospital stay was 4 days and the case fatality rate was 0.4%. The authors used a 2% sample of the entire population and by means of stepwise unconditional multivariate logistic regression modeling for pneumonia found that, independent of age, the most junior Navy and Marine Corps personnel were at highest risk. Whites were at higher risk than blacks, Hispanics, or Filipinos. These results indicate that among this generally healthy US young adult military population, pneumonia hospitalization is common, often brief, and frequently without specifically identified pathogens. C1 USN,CTR ENVIRONM HLTH,DEPT EPIDEMIOL,NORFOLK,VA. USN,ENVIRONM & PREVENT MED UNIT 5,DEPT EPIDEMIOL,SAN DIEGO,CA. USN,MED RES INST,DEPT CRIT CARE,BETHESDA,MD. RP GRAY, GC (reprint author), USN,HLTH RES CTR,CLIN EPIDEMIOL BRANCH,POB 85122,SAN DIEGO,CA 92186, USA. NR 57 TC 41 Z9 42 U1 0 U2 0 PU JOHNS HOPKINS UNIV SCHOOL HYGIENE PUB HEALTH PI BALTIMORE PA 111 MARKET PLACE, STE 840, BALTIMORE, MD 21202-6709 SN 0002-9262 J9 AM J EPIDEMIOL JI Am. J. Epidemiol. PD APR 15 PY 1994 VL 139 IS 8 BP 793 EP 802 PG 10 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA NJ044 UT WOS:A1994NJ04400008 PM 8178792 ER PT J AU SINK, CW HARDY, DR AF SINK, CW HARDY, DR TI QUANTIFICATION OF COMPOUND CLASSES IN COMPLEX-MIXTURES AND FUELS USING HPLC WITH DIFFERENTIAL REFRACTIVE-INDEX DETECTION SO ANALYTICAL CHEMISTRY LA English DT Article AB The chemical composition of liquid hydrocarbon fuels that affect engine combustion performance has historically been defined by three principal classes: saturates, monocyclic aromatics, and dicyclic aromatics. These classes may be separated by normal-phase analytical-scale high-performance Liquid chromatography and are conveniently observed as the response of a differential refractive index (DRI) detector. Obtaining accurate quantitative analysis is not straightforward because calibration standards for determining the response factor for each compound class are not available. This problem arises because the refractive index of each class varies from fuel to fuel and is not generally known accurately enough for quantitative analysis. However, the linearity of the detector response with analyte refractive index for a fixed volume of sample makes it possible to determine the relative compound class composition as well as the refractive index of each class from the peak areas measured with a DRI detector at the time of separation by HPLC. This is accomplished by obtaining the chromatograms of each sample using two different mobile phases of different refractive indexes, such as hexane and nonane in this study. The method has been applied to jet fuels in this paper, but the extension to other hydrocarbon fuels such as gasoline and diesel fuel is obviously possible. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 10 TC 12 Z9 13 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD APR 15 PY 1994 VL 66 IS 8 BP 1334 EP 1338 DI 10.1021/ac00080a020 PG 5 WC Chemistry, Analytical SC Chemistry GA NF411 UT WOS:A1994NF41100023 ER PT J AU HUNTER, CS AF HUNTER, CS TI SURGEONS AND INTERNISTS SO ANNALS OF INTERNAL MEDICINE LA English DT Letter RP HUNTER, CS (reprint author), USN MED CORPS,NAVAL MED CTR,SAN DIEGO,CA 92134, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER COLL PHYSICIANS PI PHILADELPHIA PA INDEPENDENCE MALL WEST 6TH AND RACE ST, PHILADELPHIA, PA 19106-1572 SN 0003-4819 J9 ANN INTERN MED JI Ann. Intern. Med. PD APR 15 PY 1994 VL 120 IS 8 BP 696 EP 697 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA NE850 UT WOS:A1994NE85000026 PM 8135466 ER PT J AU WILLIAMS, BA FLEMING, JW AF WILLIAMS, BA FLEMING, JW TI LIF DETECTION OF METHOXY IN CH4/O2/NO2N2 FLAMES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID LASER-INDUCED FLUORESCENCE; CH3O; SPECTROSCOPY; SPECTRUM; RADICALS; EXCITATION; EMISSION; ARGON; STATE; TORR AB CH3O is detected by laser-induced fluorescence in premixed methane/oxygen flames containing 10%-40% NO2, Spectral features between 290-300 nm can be assigned to the A-X 3(0)3 and 3(3)4 bands in excellent agreement with spectral simulations and previous experiments. Individual rotational lines are only partially resolved in the flame; spectra at reduced temperatures are needed to assign spectral features and facilitate temperature corrections to LIF profiles. No methoxy signal is observed without NO2 present; the reaction of CH3 with NO2 is though to produce CH3O in the CH4/NO2 system. Detection strategies and possible interferences in combustion environments are discussed. RP WILLIAMS, BA (reprint author), USN,RES LAB,DIV CHEM,CODE 6111,WASHINGTON,DC 20375, USA. NR 25 TC 5 Z9 5 U1 0 U2 7 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 APR 15 PY 1994 VL 221 IS 1-2 BP 27 EP 32 DI 10.1016/0009-2614(94)87011-X PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NF303 UT WOS:A1994NF30300005 ER PT J AU ROMERO, H GANGULI, G AF ROMERO, H GANGULI, G TI RELAXATION OF THE STRESSED PLASMA SHEET BOUNDARY-LAYER SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID FIELD; INSTABILITIES; PARTICLE; DRIVEN; SHEAR AB Observations indicate that the plasma sheet boundary layer (PSBL) becomes stressed during active times resulting in enhanced plasma flows, intense wave activity, and its minimum spatial width becoming on the order of the ion Larmor radius. We present simulations showing that the Electron-Ion-Hybrid (EIH) instability plays a key role during of the nonlinear relaxation of such a stressed PSBL. The EIH is a long wavelength mode (k(y)L(E) approximately 1, where k(y) is the perpendicular wavelength and L(E) the gradient scale size), its spectrum is broadband (extending from below the lower hybrid frequency to the electron plasma frequency), and its onset can generate substantial perpendicular ion acceleration and anomalous viscosity leading to particle mixing across the PSBL. C1 NRL,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. RP ROMERO, H (reprint author), NRL,DIV OPT SCI,APPL OPT BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 13 Z9 13 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 APR 15 PY 1994 VL 21 IS 8 BP 645 EP 648 DI 10.1029/93GL03385 PG 4 WC Geosciences, Multidisciplinary SC Geology GA NG993 UT WOS:A1994NG99300002 ER PT J AU MASTERS, MF TUCKER, JE WEXLER, BL SEARLES, SK AF MASTERS, MF TUCKER, JE WEXLER, BL SEARLES, SK TI KRYPTON EXCIMER EMISSION FROM DISCHARGE-EXCITED RARE-GAS CLUSTERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SUPERSONIC JETS; STATES; ARGON; VUV; SPECTROSCOPY; RADIATION; SPECTRA; SIZE AB We report the time-resolved observation of krypton second continuum excimer emission near 146 nm from a pulsed-discharge excited gas jet. The excimer emission reaches a peak intensity several millimeters from the nozzle and lasts up to several microseconds after the termination of the discharge. We report the temporal behavior of the excimer emission as a function of gas pressure, discharge energy, and position within the cathode-anode gap. The temporal and spatial characteristics of the excimer emission during the discharge are due to cluster excitation in the jet expansion region and is from a combination of the A 3SIGMA(u)+ and the B 1SIGMA(u)+ states. A kinetic mechanism involving metastable atoms and clusters is described to explain the observed afterglow emission. C1 USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375. RP MASTERS, MF (reprint author), INDIANA UNIV PURDUE UNIV,DEPT PHYS,FT WAYNE,IN 46805, USA. NR 19 TC 6 Z9 6 U1 1 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 APR 15 PY 1994 VL 75 IS 8 BP 3777 EP 3784 DI 10.1063/1.356052 PG 8 WC Physics, Applied SC Physics GA NG577 UT WOS:A1994NG57700010 ER PT J AU REMILLARD, SK REEVES, ME RACHFORD, FJ WOLF, SA AF REMILLARD, SK REEVES, ME RACHFORD, FJ WOLF, SA TI THE MICROWAVE SURFACE IMPEDANCE OF GRANULAR HIGH-T(C) SUPERCONDUCTORS IN DC MAGNETIC-FIELDS - ITS RELATIONSHIP TO FREQUENCY-DEPENDENCE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID THIN-FILMS; RESISTANCE; ABSORPTION; YBA2CU3O7; CAVITY; POWER AB The surface impedance of bulk and thick film granular high temperature superconductors has been studied. The static magnetic field, temperature, and frequency dependence of the surface ce have been analyzed in terms of the weakly coupled grain model. Accurate quantitative predictions of the frequency dependence of the surface resistance are made using this model. The model also quantitatively accounts for the negative magnetic field coefficient of the effective rf penetration depth. The rf penetration depth is a maximum when the ratio of penetration depth to skin depth is 0.930. C1 USN,RES LAB,WASHINGTON,DC 20375. ILLINOIS SUPERCOND CORP,EVANSTON,IL 60201. RP REMILLARD, SK (reprint author), COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23187, USA. RI Wolf, Stuart/A-7513-2009 NR 18 TC 15 Z9 15 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 APR 15 PY 1994 VL 75 IS 8 BP 4103 EP 4108 DI 10.1063/1.355989 PG 6 WC Physics, Applied SC Physics GA NG577 UT WOS:A1994NG57700057 ER PT J AU KEYES, BM DUNLAVY, DJ AHRENKIEL, RK SHAW, G SUMMERS, GP TZAFARAS, N LENTZ, C AF KEYES, BM DUNLAVY, DJ AHRENKIEL, RK SHAW, G SUMMERS, GP TZAFARAS, N LENTZ, C TI TIME-RESOLVED PHOTOLUMINESCENCE OF UNDOPED INP SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID SURFACE RECOMBINATION; SOLAR-CELLS; N-TYPE; GAAS AB Energy and time-resolved photoluminescence data have been obtained for nominally undoped (n 4.5 X 10(15) cm-3) bulk InP grown by the vertical-gradient freeze method. The data were taken as a function of temperature, from 80 to 290 K, and analyzed using a solution to the continuity equation. The resulting lifetime values range from 300 ns to 3.2 mus, and surface recombination velocities were fund to be on the order of 10(3) cm/s. The temperature dependence can be explained by assuming a radiatively limited recombination with a resulting B coefficient greater-than-or-equal-to 5.9 X 10(-11) cm3/s at 300 K. C1 USN,RES LAB,WASHINGTON,DC 20375. AT&T MICROELECTR LAB,READING,PA 19612. RP KEYES, BM (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 14 TC 8 Z9 8 U1 1 U2 5 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 APR 15 PY 1994 VL 75 IS 8 BP 4249 EP 4251 DI 10.1063/1.355962 PG 3 WC Physics, Applied SC Physics GA NG577 UT WOS:A1994NG57700082 ER PT J AU ACKLESON, SG BALCH, WM HOLLIGAN, PM AF ACKLESON, SG BALCH, WM HOLLIGAN, PM TI RESPONSE OF WATER-LEAVING RADIANCE TO PARTICULATE CALCITE AND CHLOROPHYLL-A CONCENTRATIONS - A MODEL FOR GULF OF MAINE COCCOLITHOPHORE BLOOMS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID DISSOLVED ORGANIC-MATTER; OPTICAL-PROPERTIES; IRRADIANCE MODEL; OCEAN COLOR; PHYTOPLANKTON; SCATTERING; ABSORPTION; ATMOSPHERES; SATELLITE; SURFACE AB A coupled atmosphere and ocean radiative transfer model, the Gulf of Maine (GOM) model, was developed to simulate water-leaving radiance from a vertically stratified ocean containing a bloom of the coccolithophore Emiliania huxleyi. The model is based largely on atmospheric and ocean data representing the Gulf of Maine. The atmospheric submodel simulates direct sunlight and diffuse skylight illuminating the sea surface and is adjusted to account for seasonal changes in atmospheric aerosols. The optical properties of E. huxleyi, required by the ocean submodel, are derived from measurements collected in Gulf of Maine coccolithophore blooms occurring in 1989 and 1990. The modeled response of volume reflectance to the combined effects of chlorophyll and particulate calcite compares favorably with field measurements of E. huxleyi cell abundance and coastal zone color scanner (CZCS)-derived volume reflectance representing a coccolithophore bloom in the northeast Atlantic Ocean. The GOM model was used to investigate the response of normalized water-leaving radiance, modeled for visible CZCS and sea viewing wide field of view sensor (SeaWiFS) bands, to particulate calcite and chlorophyll a. Ranges in the concentrations of particulate calcite, chlorophyll a, and colored dissolved organic material (CDOM) are selected to represent conditions reported for coccolithophore blooms. Water-leaving radiance increases with increasing particulate calcite concentration, primarily because of a disproportionately large amount of backscatter from detached coccoliths (about an order of magnitude larger than is predicted using Mie theory). As a result, CZCS plant pigment algorithms based upon radiance ratios may be corrupted more severely than previously estimated. As an alternative to radiance ratio-based algorithms, an iterative procedure (also referred to as optimization) is used to invert the GOM model in order to simultaneously retrieve particulate calcite and chlorophyll a concentrations. The approach uses normalized water-leaving radiance computed for all visible CZCS or SeaWiFS bands. Tests of the approach suggest that independent of errors associated with instrument calibration and atmospheric correction, errors in the retrieved concentrations are small, even when high concentrations of CDOM and vertical structure within the water column are neglected, i.e., with the assumptions that CDOM concentration is small and the water is vertically homogeneous. However, since there are no data sets of contemporaneous chlorophyll a concentration, particulate calcite concentration, and CZCS imagery, a rigorous test of the model and inversion technique must wait for the launch of new ocean color scanners such as the NASA SeaWiFS. C1 UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,MIAMI,FL 33149. PLYMOUTH MARINE LAB,PLYMOUTH PL1 3DH,ENGLAND. RP ACKLESON, SG (reprint author), OFF NAVAL RES,ONR 323OP,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 57 TC 36 Z9 36 U1 0 U2 10 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 APR 15 PY 1994 VL 99 IS C4 BP 7483 EP 7499 DI 10.1029/93JC02150 PG 17 WC Oceanography SC Oceanography GA NG710 UT WOS:A1994NG71000017 ER PT J AU MARMORINO, GO TRUMP, CL AF MARMORINO, GO TRUMP, CL TI A SALINITY FRONT AND CURRENT RIP NEAR CAPE-HATTERAS, NORTH-CAROLINA SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WATER; SHELF AB Shipboard hydrographic and acoustic Doppler current profiler data collected in September 1991 show a shallow front separating brackish coastal water from denser Gulf Stream water advancing onto the continental shelf near Cape Hatteras. The surface expression of the front has the hallmarks of a current rip: a corrugated line of flotsam (indicating surface convergence) and an adjoining band of short, steep waves (indicating wave-current interaction). Sinking flow of 15 cm/s and a 10-dB change in acoustic backscatter strength occur over a cross-front distance of 10-20 m. While northward surface currents in the Gulf Stream water move at about 60 cm/s, the front advects northward at only 35 cm/s; this difference implies frontal propagation to the south relative to the deeper fluid at a speed consistent with theoretical expectations. The surface convergence across the front is estimated to be about 50 cm/s, and the horizontal surface strain rate is estimated to be 0.025-0.05 s-1. This supports the large strain rate needed by Jansen et al. (1993) to simulate the O(10 dB) radar modulations measured at the rip by Askari (1992). Similar current rips may account for curvilinear high-backscatter features appearing in historical synthetic aperture radar images of the shelf area north of Cape Hatteras. RP MARMORINO, GO (reprint author), USN,RES LAB,CODE 7250,WASHINGTON,DC 20375, USA. NR 29 TC 24 Z9 24 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-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1994 VL 99 IS C4 BP 7627 EP 7637 DI 10.1029/93JC03214 PG 11 WC Oceanography SC Oceanography GA NG710 UT WOS:A1994NG71000025 ER PT J AU TEAGUE, WJ SHILLER, AM HALLOCK, ZR AF TEAGUE, WJ SHILLER, AM HALLOCK, ZR TI HYDROGRAPHIC SECTION ACROSS THE KUROSHIO NEAR 35-DEGREES-N, 143-DEGREES-E SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID GULF-STREAM; TRANSPORT; EXTENSION AB A closely spaced conductivity-temperature-depth/hydrographic section was conducted off the east coast of Japan in July 1992. The southeastward section crossed the Japan Trench and the Kuroshio in the vicinity of the Kashima 1 seamount. Vertical sections of temperature, salinity, density, oxygen, and nutrients are discussed in conjunction with the movement and interleaving of water masses. Complicated vertical and horizontal mixings of water masses are inferred from the temperature and salinity relationships. Mixing processes are patchy and not continuous beneath the front. Warm, salty water found beneath the Kuroshio may result from upward mixing of water from intermediate depths. The main axis of the Kuroshio, indicated by the 14-degrees-C isotherm at 200 m, is at 35.7-degrees-N, 142.6-degrees-E, about 20 km from the north wall surface thermal front. Geostrophic speeds exceed 170 cm s-1 at the surface; volume transport through the section is 81 X 10(6) m3 s-1. C1 UNIV SO MISSISSIPPI,CTR MARINE SCI,BAY ST LOUIS,MS 39529. RP TEAGUE, WJ (reprint author), NAVAL RES LAB,BAY ST LOUIS,MS 39529, USA. NR 27 TC 8 Z9 8 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 APR 15 PY 1994 VL 99 IS C4 BP 7639 EP 7650 DI 10.1029/94JC00055 PG 12 WC Oceanography SC Oceanography GA NG710 UT WOS:A1994NG71000026 ER PT J AU BRUCE, JG JOHNSON, DR KINDLE, JC AF BRUCE, JG JOHNSON, DR KINDLE, JC TI EVIDENCE FOR EDDY FORMATION IN THE EASTERN ARABIAN SEA DURING THE NORTHEAST MONSOON SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WESTERN INDIAN-OCEAN; SEASONAL CIRCULATION; EQUATORIAL JET; ALTIMETRY; MODEL AB The seasonal formation of a large (500-800 km diameter) anticyclonic eddy in the upper 300-400 m of the eastern Arabian Sea during the northeast monsoon period (December-April) is indicated from hydrographic and satellite altimetry sea level observations, as well as from numerical model experiments. The center of the eddy circulation is approximately 10-degrees-N, 70-degrees-E, just to the west of the north-south Laccadive Island chain. In this paper the eddy is called the Laccadive High (LH). In some ways it is a mirrorlike counterpart to the Great Whirl, which develops during the southwest monsoon off the Somali coast (western Arabian Sea). The LH occurs at the same latitude but on the opposite side of the basin during the reversed monsoon. It is different from the Great Whirl, however, in its formation process, its intensity, and its decay. The hydrographic data obtained from surveys all during a single season give sufficiently close station spacing to allow reasonable contouring of the geopotential surfaces and of the properties within and around the LH region with minimum time aliasing. The Geosat altimeter record extends over 4 years, during which the seasonal variability of the LH indicates a dynamic relief of approximately 15-20 cm, which is in good agreement with the hydrographic observations. The altimetry time series also suggests a westward translation of the LH by January with a subsequent dissipation in midbasin. The model used is a wind-forced three-layer primitive equation model which depicts a LH in agreement with the timing, position, and amplitude of both the hydrographic and altimetric measurements. The numerical simulation includes a passive tracer located in the western Bay of Bengal; the western advection of the tracer around the south coasts of Sri Lanka and India in December and January is consistent with the appearance of low-salinity water observed to extend into the Arabian Sea during this period. The modeling studies suggest that both local and remote forcing are important in formation of the LH. RP BRUCE, JG (reprint author), USN,OCEANOGR OFF,CODE N341,BAY ST LOUIS,MS 39522, USA. NR 30 TC 108 Z9 110 U1 1 U2 2 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 APR 15 PY 1994 VL 99 IS C4 BP 7651 EP 7664 DI 10.1029/94JC00035 PG 14 WC Oceanography SC Oceanography GA NG710 UT WOS:A1994NG71000027 ER PT J AU COOPER, AL CHUBB, SR ASKARI, F VALENZUELA, GR BENNETT, JR KELLER, WC AF COOPER, AL CHUBB, SR ASKARI, F VALENZUELA, GR BENNETT, JR KELLER, WC TI RADAR SURFACE SIGNATURES FOR THE 2-DIMENSIONAL TIDAL CIRCULATION OVER PHELPS BANK, NANTUCKET SHOALS - A COMPARISON BETWEEN THEORY AND EXPERIMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID BOTTOM TOPOGRAPHY; MICROWAVE BACKSCATTER; WAVES; BATHYMETRY AB A comparison is made between real aperture radar (RAR) measurements and simulations (based on modeled tidal currents) of radar cross section over a complicated tidal basin (in the vicinity of the Phelps Bank region of the Nantucket shoals) in order to more fully understand the origin of radar signatures that are observed at the ocean surface as a consequence of variations in the topography of the ocean bottom. The Phelps Bank region was mapped under two extreme wind speed conditions: in high winds, in excess of 15 m/s, and in low winds, of the order of 2-3 m/s. For the light-wind case the measured radar cross section over the west side of the Phelps Bank was enhanced by as much as 20 dB relative to the clutter background. For the high-wind case, no discernible bathymetric signature was found in the high-clutter background. Numerical results for the two-dimensional M2 (semidiurnal) tidal currents over the Phelps Bank (Greenberg et al., 1989), with 1/8 x 1/8 min of arc resolution, are used as input to the surface signature models: the Alpers and Hennings (1984) first-order Bragg relaxation model; a generalized form of this relaxation model (in which wind directional effects are incorporated in an approximate manner); and the full-spectrum model of Lyzenga and Bennett (1988). Comparisons between the models (which do not include wave breaking) and an extreme case of 2-3 m/s winds (where strong wave breaking could become important) reveal that although the models predict correlation between variations in bottom topography and surface signature, they significantly underpredict the magnitude of the observed effect. The model calculations also are very sensitive at low (<2 m/s) wind speeds to the functional form that is assumed for the wind-wave forcing in the wave action equation. Prior visual observations and measurements of wave spectra (and wave shoaling) in the vicinity of Phelps Bank strongly suggest that the deficiencies of the modeled results that occur explicitly at light winds are due to wave breaking. A number of additional experiments and measurements are suggested for more normal environmental conditions for further theory assessments. C1 SCI APPLICAT INT CORP, SAN DIEGO, CA 92121 USA. UNIV WASHINGTON, APPL PHYS LAB, SEATTLE, WA 98195 USA. RP USN, RES LAB, 4555 OVERLOOK AVE, WASHINGTON, DC 20375 USA. NR 28 TC 26 Z9 29 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9275 EI 2169-9291 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1994 VL 99 IS C4 BP 7865 EP 7883 DI 10.1029/94JC00056 PG 19 WC Oceanography SC Oceanography GA NG710 UT WOS:A1994NG71000041 ER PT J AU WILLIAMS, RT CHAN, JCL AF WILLIAMS, RT CHAN, JCL TI NUMERICAL-STUDIES OF THE BETA-EFFECT IN TROPICAL CYCLONE MOTION .2. ZONAL MEAN FLOW EFFECTS SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID BAROTROPIC VORTEX; SHALLOW-WATER; MODEL AB The motion of tropical vortices in east-west mean flows is studied with the barotropic vorticity equation on the beta plane. The vorticity equation is integrated numerically from an initially symmetric vortex embedded in (i) a linear shear flow or (ii) a parabolic jet. The first experiment with flow (i) has beta = 0 and it is linearized about the mean flow. The vortex is distorted by the mean flow so that the even Fourier components around the vortex grow, but the vortex does not move. When nonlinear effects are included the distortion is damped in the inner part of the vortex, but wavenumber two grows in the outer region. The addition of the beta effect causes the vortex to move in the same direction as the no mean flow solution provided the mean flow advection is removed from the trajectories. The trajectory for the anticyclonic mean flow is significantly longer than the cyclonic and no mean flow trajectories, which are about equal. For mean flow (ii), with the same absolute vorticity gradient as beta but on an f plane, the vortex has a much shorter trajectory and a more westerly direction of movement than the no mean flow solution with beta. This effect comes from the advective distortion of the vortex, which projects onto wavenumber one in the disturbance vorticity equation. It is shown with other experiments that beta has a stronger effect on vortex motion than the relative vorticity gradient. C1 CITY POLYTECH HONG KONG,HONG KONG,HONG KONG. RP WILLIAMS, RT (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,NPS MR WU PJ,MONTEREY,CA 93943, USA. OI CHAN, Johnny Chung Leung/0000-0001-8390-7422 NR 15 TC 32 Z9 37 U1 1 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-4928 J9 J ATMOS SCI JI J. Atmos. Sci. PD APR 15 PY 1994 VL 51 IS 8 BP 1065 EP 1076 DI 10.1175/1520-0469(1994)051<1065:NSOTBE>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NJ888 UT WOS:A1994NJ88800003 ER PT J AU VARDIMAN, RG AF VARDIMAN, RG TI TEMPERATURE-INDUCED PHASE DEVELOPMENT IN TITANIUM-IMPLANTED SILICON-CARBIDE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article AB Silicon carbide has been implated with titanium at three different doses. Transmission electron microscopy and Rutherford back-scattering (RBS) have been used to follow changes resulting from post-implantation heat treatment. The as-implanted layer is amorphous, and after a low temperture anneal a fine, non-equilibrium titanium carbide precipitate appears in the amorphous matrix. At higher temperatures, first the ternary phase Ti3SiC2 and the SiC crystallizes. RBS measurements show that the initial Gaussian titanium concentration profile changes near the ternary phase precipitation temperature, developing side peaks at the area of maximum initial concentration gradient. Thermodynamic and kinetic factors in the observed phase development are discussed, and the need for a metastable phase diagram is considered. RP VARDIMAN, RG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 4 Z9 4 U1 0 U2 3 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 APR 15 PY 1994 VL 177 IS 1-2 BP 209 EP 215 DI 10.1016/0921-5093(94)90492-8 PG 7 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA NE257 UT WOS:A1994NE25700021 ER PT J AU CHEN, TW AF CHEN, TW TI DIFFRACTION BY A SPHERICAL DIELECTRIC AT LARGE-SIZE PARAMETER SO OPTICS COMMUNICATIONS LA English DT Article ID GENERALIZED EIKONAL APPROXIMATION; LIGHT-SCATTERING AB A new diffraction formula from a spherical dielectric is obtained. The formula, an extension of the Fraunhofer diffraction formula, introduces a small but important dependence of the diffraction minima on refractive index. C1 USN,NAVAL COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,SAN DIEGO,CA 92132. RP CHEN, TW (reprint author), NEW MEXICO STATE UNIV,DEPT PHYS,LAS CRUCES,NM 88003, USA. NR 9 TC 6 Z9 6 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 APR 15 PY 1994 VL 107 IS 3-4 BP 189 EP 192 DI 10.1016/0030-4018(94)90018-3 PG 4 WC Optics SC Optics GA NF500 UT WOS:A1994NF50000003 ER PT J AU MOON, JA REINTJES, J AF MOON, JA REINTJES, J TI IMAGE-RESOLUTION BY USE OF MULTIPLY SCATTERED-LIGHT SO OPTICS LETTERS LA English DT Article ID MEDIA AB We present calculations based on the Markov-chain technique of the intensity and direction of light traversing a multiply scattering medium in the isotropic scattering case for pulsed point-source illumination. From these calculations we derive expressions for the trade-off between spatial image resolution and detector integration time when the diffusion approximation is not valid. We show that image resolution better than the diffusion limit is theoretically possible use of multiply scattered light for samples thinner than approximately 35 scattering lengths. Monte Carlo simulations are used to extend these results to the anisotropic scattering case. RP MOON, JA (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 5640,WASHINGTON,DC 20375, USA. NR 11 TC 37 Z9 37 U1 1 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 15 PY 1994 VL 19 IS 8 BP 521 EP 523 DI 10.1364/OL.19.000521 PG 3 WC Optics SC Optics GA NF316 UT WOS:A1994NF31600003 PM 19844359 ER PT J AU RUDIN, S REINECKE, TL AF RUDIN, S REINECKE, TL TI INTERACTION OF COUPLED PLASMON-PHONON MODES WITH A POINT-CHARGE IN A POLAR SEMICONDUCTOR SO PHYSICAL REVIEW B LA English DT Article AB The coupled plasmon-longitudinal-optical-phonon modes of a degenerate inhomogeneous electron or hole gas in a bulk compound semiconductor are studied. The interaction of a point charge with these coupled modes is derived in the random-phase approximation for both the carriers and the phonons in a form which is appropriate for treating inhomogeneous carrier systems. An integral equation governing the interaction of a static point charge with these coupled modes is derived which has the same form as that in the case of a point-charge interacting with plasmons alone but in which the parameters are modified by the coupling to phonons. As a specific example, these results are used to study the binding of the coupled plasmon-phonon modes to point charges in degenerate compound semiconductors, and it is found that such bound states will exist only at very low carrier densities. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP USA, RES LAB, FT MONMOUTH, NJ 07703 USA. NR 6 TC 1 Z9 1 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 APR 15 PY 1994 VL 49 IS 15 BP 10298 EP 10302 DI 10.1103/PhysRevB.49.10298 PG 5 WC Physics, Condensed Matter SC Physics GA NJ756 UT WOS:A1994NJ75600026 ER PT J AU AGASSI, D AF AGASSI, D TI LANDAU-LEVELS IN A BAND-INVERTED JUNCTION AND QUANTUM-WELL SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-FIELD PARALLEL; SEMICONDUCTOR SUPERLATTICES; INTERFACE STATES; HETEROJUNCTIONS; LAYERS AB The Landau levels pertaining to a symmetric band-inverted junction and quantum well are calculated in the presence of a magnetic field parallel to the interface. It is shown that the effective band gap is widened at the interfaces, the Landau eigenenergies vary nonmonotonically with distance of the orbit's center from the structure interfaces and that these levels have a noninteger number of harmonic-oscillator energy quanta. The Landau levels in the presence of a magnetic field perpendicular to the interfaces are briefly discussed. RP AGASSI, D (reprint author), USN, CTR SURFACE WARFARE, WHITE OAK, MD 20903 USA. NR 27 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 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1994 VL 49 IS 15 BP 10393 EP 10401 DI 10.1103/PhysRevB.49.10393 PG 9 WC Physics, Condensed Matter SC Physics GA NJ756 UT WOS:A1994NJ75600039 ER PT J AU CHOI, JB YOO, KH HAN, JW KANG, TW MEYER, JR HOFFMAN, CA KARCZEWSKI, G FURDYNA, JK FAURIE, JP AF CHOI, JB YOO, KH HAN, JW KANG, TW MEYER, JR HOFFMAN, CA KARCZEWSKI, G FURDYNA, JK FAURIE, JP TI TRANSPORT AND OPTICAL-PROPERTIES OF HOLES IN P-TYPE ZERO-BAND-GAP HG(1-X)ZN(X)TE/CDTE SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID HGTE-CDTE SUPERLATTICES; ELECTRON; MOBILITIES AB Transport, reflectivity, and magneto-optical measurements have been performed on a p-type zero-band-gap HgxZn1-xTe/CdTe superlattice for systematic investigation of the anomalous properties of holes. The observed magnetotransport, intrasubband, and intersubband optical-transition data are fully correlated with a k.p band calculation and show consistent behavior resulting from two holes with different mobilities. The distinctive features of the holes are accurately explained by the extremely non-parabolicity and anisotropic nature of the valence-band structure. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 47907. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. KYUNG HEE UNIV,DEPT PHYS,SEOUL 130701,SOUTH KOREA. SEJONG UNIV,DEPT PHYS,SEOUL 133747,SOUTH KOREA. DONGGUK UNIV,DEPT PHYS,SEOUL 100715,SOUTH KOREA. RP CHOI, JB (reprint author), CHUNGBUK NATL UNIV,DEPT PHYS,CHONGJU 360763,SOUTH KOREA. NR 11 TC 2 Z9 2 U1 0 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 APR 15 PY 1994 VL 49 IS 16 BP 11060 EP 11065 DI 10.1103/PhysRevB.49.11060 PG 6 WC Physics, Condensed Matter SC Physics GA NK063 UT WOS:A1994NK06300026 ER PT J AU FERTIG, HA REINECKE, TL AF FERTIG, HA REINECKE, TL TI LOCALIZATION AND DIFFUSION OF PHONON MODES IN SEMICONDUCTOR SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID LO PHONONS; DIMENSIONS AB We have studied the effects of disorder on energy transport by confined optical phonons in, GaAs/AlxGa1-xAs semiconductor superlattices. A model which includes both interface and alloy disorder has been studied using diagrammatic perturbation techniques. We find that true phonon localization is not expected for realistic systems but rather that a transition from ballistic to diffusive transport occurs for increasing barrier widths. The implications of these results for recent experimental data are discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP FERTIG, HA (reprint author), UNIV KENTUCKY,DEPT PHYS & ASTRON,LEXINGTON,KY 40506, USA. NR 17 TC 5 Z9 5 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 APR 15 PY 1994 VL 49 IS 16 BP 11168 EP 11172 DI 10.1103/PhysRevB.49.11168 PG 5 WC Physics, Condensed Matter SC Physics GA NK063 UT WOS:A1994NK06300040 ER PT J AU DAVIDSON, BN PICKETT, WE AF DAVIDSON, BN PICKETT, WE TI TIGHT-BINDING STUDY OF HYDROGEN ON THE C(111), C(100), AND C(110) DIAMOND SURFACES SO PHYSICAL REVIEW B LA English DT Article ID TOTAL ENERGY MINIMIZATION; RECONSTRUCTION; CHEMISORPTION; SILICON; SI; ADSORPTION; PARAMETERS; ACETYLENE; MECHANISM; DYNAMICS AB The band structure, total energies, and relaxed geometries are calculated for the C(111), C(100), and C(110) surfaces using a parametrized tight-binding model for carbon. The method and addition of C-H parameters to the model are described in detail. Results for the bare and hydrogenated C(111) surfaces are used to compare the accuracy of the method with ab initio techniques. A stable hydrogenated (2 x 1) pi reconstructed surface is found, which resembles the C(110) surface. Removal of one H atom from the dihydride C(100) results in a 3/2 hydride surface, where the odd hydrogen is bonded equally to two surface carbons. Although the fully H-covered C(100)(2 x 1) surface has a clean gap, the partially covered surface has a half-filled state, consistent with photoemission data. The geometries and H vibrations are also presented for the C(110) surface. The surface chains on the bare C(110) have bond lengths close to graphite and dimerize from a Peierls distortion. Addition of H to this surface restores the bond lengths to approximately that of bulk diamond. Comparison of the band structures and H vibrations with experiment helps identify the nature of the hydrogen coverage on the surfaces. RP DAVIDSON, BN (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 52 TC 117 Z9 119 U1 0 U2 9 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 APR 15 PY 1994 VL 49 IS 16 BP 11253 EP 11267 DI 10.1103/PhysRevB.49.11253 PG 15 WC Physics, Condensed Matter SC Physics GA NK063 UT WOS:A1994NK06300050 ER PT J AU HALL, DC BURNS, WK AF HALL, DC BURNS, WK TI WAVELENGTH STABILITY OPTIMIZATION IN ER3+-DOPED SUPERFLUORESCENT FIBER SOURCES SO ELECTRONICS LETTERS LA English DT Article DE FIBER LASERS; FREQUENCY STABILITY ID FIBER SOURCE AB The mean wavelength dependence on pump power in broadband Er3+-doped superfluorescent fibre sources for fibre gyroscope applications is studied. Data are presented showing that mean wavelength variations with pump power are length dependent, and can be reduced to zero for selected pump powers by optimising the fibre length. RP HALL, DC (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5670,WASHINGTON,DC 20375, USA. NR 8 TC 19 Z9 30 U1 0 U2 3 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD APR 14 PY 1994 VL 30 IS 8 BP 653 EP 654 DI 10.1049/el:19940430 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA NL309 UT WOS:A1994NL30900028 ER PT J AU SAVAGE, HT CHEN, DX GOMEZPOLO, C VAZQUEZ, M WUNFOGLE, M AF SAVAGE, HT CHEN, DX GOMEZPOLO, C VAZQUEZ, M WUNFOGLE, M TI A GIANT BARKHAUSEN EFFECT WITH 2ND-ORDER INSTABILITY SO JOURNAL OF PHYSICS D-APPLIED PHYSICS LA English DT Article ID WIRES AB We have observed a giant Barkhausen effect where magnetization proceeds continuously with field in a second-order instability process. This is contrasted with the typical giant Barkhausen effect in which the magnetization jumps, or moves discontinuously with field in a first-order instability process. This second-order instability process has been found in Fe-rich amorphous wires in two cases: (i) transverse field-annealed long wires and (ii) short as-cast wires. Anomalous losses are found to be very large and are of significant magnitude around 1 Hz. C1 INST CIENCIA MAT,E-28006 MADRID,SPAIN. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP SAVAGE, HT (reprint author), UCM,RENFE,INST MAGNET APLICADO,APARTADO 155,E-28230 MADRID,SPAIN. RI Gomez-Polo, Cristina/A-4680-2017 OI Gomez-Polo, Cristina/0000-0001-8919-4822 NR 7 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0022-3727 J9 J PHYS D APPL PHYS JI J. Phys. D-Appl. Phys. PD APR 14 PY 1994 VL 27 IS 4 BP 681 EP 684 DI 10.1088/0022-3727/27/4/001 PG 4 WC Physics, Applied SC Physics GA NH073 UT WOS:A1994NH07300001 ER PT J AU BARTEL, N BIETENHOLZ, MF RUPEN, MP CONWAY, JE BEASLEY, AJ SRAMEK, RA ROMNEY, JD TITUS, MA GRAHAM, DA ALTUNIN, VI JONES, DL RIUS, A VENTURI, T UMANA, G FRANCIS, RL MCCALL, ML RICHER, MG STEVENSON, CC WEILER, KW VANDYK, SD PANAGIA, N CANNON, WH POPELAR, J DAVIS, RJ AF BARTEL, N BIETENHOLZ, MF RUPEN, MP CONWAY, JE BEASLEY, AJ SRAMEK, RA ROMNEY, JD TITUS, MA GRAHAM, DA ALTUNIN, VI JONES, DL RIUS, A VENTURI, T UMANA, G FRANCIS, RL MCCALL, ML RICHER, MG STEVENSON, CC WEILER, KW VANDYK, SD PANAGIA, N CANNON, WH POPELAR, J DAVIS, RJ TI THE SHAPE, EXPANSION RATE AND DISTANCE OF SUPERNOVA-1993J FROM VLBI MEASUREMENTS SO NATURE LA English DT Article ID RADIO SUPERNOVAE; YOUNG SUPERNOVA; INTERFEROMETRY; MODEL; M82 AB SUPERNOVA 1993J is one of the closest supernovae discovered this century, allowing observations with very high linear resolution. Radio emission from the supernova became visible within days of the first optical peak, and has remained strong, making this an ideal source for very-long-baseline interferometry (VLBI) investigations1-7. Here we report the results of a series of VLBI observations, made from one to three months after the supernova explosion. We find that the supernova is circularly symmetric, which is somewhat surprising in view of suggestions that the progenitor was a member of a binary system8,9, and the asymmetry implied by optical observations10. The supernova shows no sign of deceleration, and the expansion velocities that we estimate from the VLBI measurements are consistent with the maximum optical line velocities11, suggesting that the radio emission indeed arises from the shock front, where the ejecta are hitting the gas that surrounded the progenitor star. We combine the angular expansion rate determined by the VLBI data with the optically derived expansion speed to estimate a distance to M81 of 4.0 +/- 0.6 Mpc, consistent with the value obtained from measurements of Cepheid variables in M81, 3.63 +/- 0.34 Mpc (ref. 12). C1 NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. HAYSTACK OBSERV,WESTFORD,MA 01886. MAX PLANCK INST RADIOASTRON,D-53010 BONN,GERMANY. JET PROP LAB,PASADENA,CA 91109. FAC CIENCIAS MATEMAT MADRID,INST ASTRON & GEODESIA,E-28040 MADRID,SPAIN. CNR,INST RADIOASTRON,I-40126 BOLOGNA,ITALY. CNR,INST RADIOASTRON,NOTO,ITALY. USN,RES LAB,WASHINGTON,DC 20375. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. INST SPACE & TERR SCI,N YORK M3J 3K1,ON,CANADA. NAT RESOURCES CANADA,OTTAWA K1A OY3,ON,CANADA. NUFFIELD RADIO ASTRON OBSERV LABS,MACCLESFIELD SK11 9DL,CHESHIRE,ENGLAND. RP BARTEL, N (reprint author), YORK UNIV,DEPT PHYS & ASTRON,N YORK M3J 1P3,ON,CANADA. RI Antonio, Rius/A-4873-2012; OI Antonio, Rius/0000-0002-5947-2649; Venturi, Tiziana/0000-0002-8476-6307 NR 32 TC 52 Z9 52 U1 0 U2 3 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD APR 14 PY 1994 VL 368 IS 6472 BP 610 EP 613 DI 10.1038/368610a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NF392 UT WOS:A1994NF39200052 ER PT J AU HARLAN, DM HENGARTNER, H HUANG, ML KANG, YH ABE, R MOREADITH, RW PIRCHER, H GRAY, GS OHASHI, PS FREEMAN, GJ NADLER, LM JUNE, CH AICHELE, P AF HARLAN, DM HENGARTNER, H HUANG, ML KANG, YH ABE, R MOREADITH, RW PIRCHER, H GRAY, GS OHASHI, PS FREEMAN, GJ NADLER, LM JUNE, CH AICHELE, P TI MICE EXPRESSING BOTH B7-1 AND VIRAL GLYCOPROTEIN ON PANCREATIC BETA-CELLS ALONG WITH GLYCOPROTEIN-SPECIFIC TRANSGENIC T-CELLS DEVELOP DIABETES DUE TO A BREAKDOWN OF T-LYMPHOCYTE UNRESPONSIVENESS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID COSTIMULATORY MOLECULE; MONOCLONAL-ANTIBODIES; B-CELLS; CD28; ACTIVATION; INDUCTION; SELECTION; RECEPTOR; ANTIGEN; POPULATIONS AB T lymphocytes have been implicated in the onset of many autoimmune diseases; however, the mechanisms underlying T-cell activation toward self antigens are poorly understood. To study whether T-lymphocyte costimulation can overcome the immunologic unresponsiveness observed in an in vivo model, we have created transgenic mice expressing the costimulatory mouse molecule B7-1, a ligand for the CD28 receptor, on pancreatic beta cells. We now report that triple-transgenic mice expressing both B7-1 and a viral glycoprotein on their beta cells, along with T cells expressing the viral-glycoprotein-specific transgenic T-cell receptor, all develop insulitis (lymphocytic infiltration of the pancreatic islets) and diabetes. In striking contrast, the T cells in double-transgenic mice expressing the same viral glycoprotein (but no B7) on their pancreatic beta cells and the transgenic T-cell receptor on their T cells, reported earlier, remain indifferent to the glycoprotein-expressing beta cells. In fact, all three transgenes are required to initiate immune-mediated destruction of the beta cells. Mice expressing any of the transgenes alone, or any two in combination, maintain normal islet architecture and never spontaneously develop insulitis or diabetes. Our results show that aberrant B7 expression on peripheral tissues may play an important role in the activation of self-reactive T cells and further suggest that abnormal expression of costimulatory receptors may be involved in various T-cell-mediated autoimmune diseases. C1 UNIV ZURICH,DEPT PATHOL,INST EXPTL IMMUNOL,CH-8091 ZURICH,SWITZERLAND. REPLIGEN CORP,CAMBRIDGE,MA 02139. UNIV TEXAS,SW MED CTR,MOLEC CARDIOL LAB,DALLAS,TX 75235. UNIV TORONTO,ONTARIO CANC INST,DEPT MED BIOPHYS & IMMUNOL,TORONTO M4X 1K9,ONTARIO,CANADA. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,BOSTON,MA 02115. RP HARLAN, DM (reprint author), USN,MED RES INST,DEPT IMMUNOBIOL,BETHESDA,MD 20889, USA. NR 42 TC 165 Z9 165 U1 0 U2 1 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD APR 12 PY 1994 VL 91 IS 8 BP 3137 EP 3141 DI 10.1073/pnas.91.8.3137 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NF968 UT WOS:A1994NF96800057 PM 7512724 ER PT J AU SNOW, ES CAMPBELL, PM AF SNOW, ES CAMPBELL, PM TI FABRICATION OF SI NANOSTRUCTURES WITH AN ATOMIC-FORCE MICROSCOPE SO APPLIED PHYSICS LETTERS LA English DT Article ID SCANNING TUNNELING MICROSCOPE; AQUEOUS KOH; SILICON AB A method for fabricating Si nanostructures with an air-operated atomic force microscope (AFM) is presented. An electrically conducting AFM tip is used to oxidize regions of size 10-30 nm of a H-passivated Si (100) surface at write speeds up to 1 mm/s. This oxide serves as an effective mask for pattern transfer into the substrate by selective liquid etching. The initial oxide growth rate depends exponentially on the applied voltage which produces an effective ''tip sharpening'' that allows small features to be produced by a relatively large diameter tip. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 13 TC 359 Z9 362 U1 0 U2 41 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 11 PY 1994 VL 64 IS 15 BP 1932 EP 1934 DI 10.1063/1.111746 PG 3 WC Physics, Applied SC Physics GA NE709 UT WOS:A1994NE70900014 ER PT J AU FRANKEL, MY CARRUTHERS, TF AF FRANKEL, MY CARRUTHERS, TF TI TRANSIENT ELLIPSOMETRIC SURFACE PHOTOREFLECTANCE APPLIED TO GAAS SO APPLIED PHYSICS LETTERS LA English DT Article ID REFRACTIVE-INDEX; CARRIER DYNAMICS; FEMTOSECOND AB We apply a time-resolved reflection ellipsometric technique to study the dynamic properties of the surface dielectric index of GaAs after optical excitation. The technique allows the separation of the refractive and absorptive components of the dielectric index change and accounts for possible anisotropic effects. The carriers optically injected at the surface create electric field perturbations of approximately 7 kV/cm for an average carrier density of approximately 10(18) cm-3 over a depth of approximately 0.25 mum. The measured absorptive component change is shown to be qualitatively different from that typically measured via thin-film transmission and can be attributed to the Franz-Keldysh effect. RP USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. NR 17 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 11 PY 1994 VL 64 IS 15 BP 1950 EP 1952 DI 10.1063/1.111752 PG 3 WC Physics, Applied SC Physics GA NE709 UT WOS:A1994NE70900020 ER PT J AU BYUN, DG HWANG, SD DOWBEN, PA PERKINS, FK FILIPS, F IANNO, NJ AF BYUN, DG HWANG, SD DOWBEN, PA PERKINS, FK FILIPS, F IANNO, NJ TI HETEROJUNCTION FABRICATION BY SELECTIVE-AREA CHEMICAL-VAPOR-DEPOSITION INDUCED BY SYNCHROTRON-RADIATION SO APPLIED PHYSICS LETTERS LA English DT Article ID SI EPITAXIAL-GROWTH; MOLECULAR-BEAM SYSTEM; THIN-FILMS; CARBORANES; DISILANE; IRRADIATION; BORANES; TEMPERATURE; SILICON; SURFACE AB We have fabricated a B5C, boron-carbide/Si(111) heterojunction diode by the synchrotron radiation-induced decomposition of orthocarborane. This diode can be compared with similar boron-carbide/Si(111) heterojunction diodes fabricated by plasma enhanced chemical vapor deposition. The synchrotron radiation induced chemical vapor deposition is postulated to occur via the decomposition of weakly chemisorbed species and the results suggest that ''real-time'' projection lithography (selective area deposition) of boron-carbide devices is possible. C1 UNIV NEBRASKA,CTR MAT RES & ANAL,DEPT PHYS,LINCOLN,NE 68588. USN,RES LAB,DIV ELECTR SCI TECHNOL,WASHINGTON,DC 20375. UNIV NEBRASKA,CTR MAT RES & ANAL,DEPT ELECT ENGN,LINCOLN,NE 68588. SYRACUSE UNIV,SOLID STATE SCI & TECHNOL PROGRAM,SYRACUSE,NY 13244. NR 23 TC 40 Z9 40 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 APR 11 PY 1994 VL 64 IS 15 BP 1968 EP 1970 DI 10.1063/1.111758 PG 3 WC Physics, Applied SC Physics GA NE709 UT WOS:A1994NE70900026 ER PT J AU ABARBANEL, HDI KATZ, RA GALIB, T CEMBROLA, J FRISON, TW AF ABARBANEL, HDI KATZ, RA GALIB, T CEMBROLA, J FRISON, TW TI HIGH REYNOLDS-NUMBER BOUNDARY-LAYER CHAOS SO PHYSICAL REVIEW LETTERS LA English DT Article ID FLOW; DIMENSION AB Using tools for the analysis of nonlinear chaotic observations, we have determined the embedding dimension required for data from measurements of wall pressure fluctuations in high Reynolds number boundary layer flow around an axisymmetric body. The Reynolds number based on the boundary layer size is as large as 10(5), and the number of degrees of freedom excited in the fluid is certainly very large. Yet the active degrees of freedom seen by the pressure sensors in the transitional and turbulent parts of the flow are as low as 8 to 10. We discuss the source of these results in terms of sensor size and the known coherent structures in these shear flows. C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,MARINE PHYS LAB,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,INST NONLINEAR STUDIES,LA JOLLA,CA 92093. USN,CTR UNDERSEA WARFARE,DETACHMENT NEW LONDON,NEW LONDON,CT 06320. USN,CTR UNDERSEA WARFARE,DIV NEWPORT,NEWPORT,RI 02841. RANDLE INC,GREAT FALLS,VA 22066. RP ABARBANEL, HDI (reprint author), UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 13 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 11 PY 1994 VL 72 IS 15 BP 2383 EP 2386 DI 10.1103/PhysRevLett.72.2383 PG 4 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100019 ER PT J AU FISCHER, RP FLIFLET, AW MANHEIMER, WM LEVUSH, B ANTONSEN, TM GRANATSTEIN, VL AF FISCHER, RP FLIFLET, AW MANHEIMER, WM LEVUSH, B ANTONSEN, TM GRANATSTEIN, VL TI PHASE-LOCKING, AMPLIFICATION, AND MODE SELECTION IN AN 85-GHZ QUASI-OPTICAL GYROKLYSTRON SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUASI-OPTICAL GYROTRONS; ELECTRON-CYCLOTRON MASER; HIGH-POWER; OPERATION; OSCILLATORS; FREQUENCY; BEAM AB A highly overmoded 85 GHz gyroklystron experiment is reported using two quasioptical resonators. Phase locking at 70 kW output power and 16% efficiency is demonstrated over the entire linewidth of the output resonator by prebunching the electron beam. Amplifier operation at 30 kW output power is observed with over 18 dB gain. Two techniques, mode priming and alpha priming, allow access to the hard excitation region of the gyroklystron. Good agreement is obtained between the multimode simulation code and important features of the experiment. C1 UNIV MARYLAND,PLASMA RES LAB,COLL PK,MD 20742. UNIV MARYLAND,DEPT ELECT ENGN,COLL PK,MD 20742. RP FISCHER, RP (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. RI Antonsen, Thomas/D-8791-2017 OI Antonsen, Thomas/0000-0002-2362-2430 NR 20 TC 19 Z9 19 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 APR 11 PY 1994 VL 72 IS 15 BP 2395 EP 2398 DI 10.1103/PhysRevLett.72.2395 PG 4 WC Physics, Multidisciplinary SC Physics GA NE851 UT WOS:A1994NE85100022 ER PT J AU TAI, O SKORUPKA, C PECORA, LM AF TAI, O SKORUPKA, C PECORA, LM TI CHAOTIC PARAMETER VARIATION IN MAPS - PSEUDOPERIODICITY, CRISIS AND SYNCHRONIZATION SO PHYSICS LETTERS A LA English DT Article ID DYNAMICAL-SYSTEMS; ATTRACTORS; TRANSIENTS AB We show that chaotically driving identical multiple period systems with a chaotic system can cause them to remain synchronized. That is the basins of attraction merge. We show this for the logistic map and relate it to other work in chaotic and quasiperiodic driving of nonlinear systems. C1 USN,RES LAB,WASHINGTON,DC 20375. SESQUEHANNA UNIV,SELINSGROVE,PA. RP TAI, O (reprint author), HARVARD UNIV,CAMBRIDGE,MA 02138, USA. NR 20 TC 6 Z9 7 U1 0 U2 0 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 APR 11 PY 1994 VL 187 IS 2 BP 175 EP 179 DI 10.1016/0375-9601(94)90058-2 PG 5 WC Physics, Multidisciplinary SC Physics GA NF464 UT WOS:A1994NF46400009 ER PT J AU GAUME, RA WILSON, TL JOHNSTON, KJ AF GAUME, RA WILSON, TL JOHNSTON, KJ TI HIGH-RESOLUTION MEASUREMENTS OF NH3 ABSORPTION TOWARD CASSIOPEIA-A SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, INDIVIDUAL (CAS-A); ISM, MOLECULES; RADIO LINES, ISM; SUPERNOVA REMNANTS ID CAS-A; CLOUDS AB We have observed NH3 absorption against the bright supernova remnant Cassiopeia A. The 3'' resolution VLA map shows absorption against the brightest continuum peak in the NH3 (J, K) = (1,1) inversion transition. The absorption maximum is at R.A. = 23h20m54s.8, Decl. = +50-degrees-32'23'' (1950.0), projected against the region of brightest continuum emission. This is near where the deepest absorption was found with the 40'' beam of the Effelsberg 100 m telescope. The apparent optical depth of the NH3 absorption, when averaged over the strongest continuum emission, is almost-equal-to 0.1. The NH3 absorption region has a size of at least 60''. In order to characterize the NH3-containing cloud, J = 1-0 and J = 2-1 spectra of CO and (CO)-C-13 were taken for the nearest CO cloud, 20'' from the NH3 maximum. In addition, a spectrum of the J = 2-1 transition of (CO)-C-13 was taken at the position of maximum NH3 absorption. These CO and (CO)-C-13 data show that the V(lsr) of the cloud is -39 km s-1, the FWHP line width is 3.5 km s-1, and the column density, N(H2), is 3 x 10(21) cm-2. The density, n(H2), is about 1000 cm-3 and kinetic temperature, T(k), is 18 K. The virial mass estimated for this cloud is about 60 times the mass obtained from CO data. It is likely that the NH3 absorption and CO emission arise in the same physical region. This region is significantly warmer than a typical dark dust cloud, shows a significantly larger line width, and has about 0.1 of the cloud mass in H I. The n(H2) and N(H2) values are comparable to dark dust cloud values. The enhanced kinetic temperature may be caused by an increased cosmic-ray rate, or by cloud-cloud collisions. C1 MAX PLANCK INST RADIOASTRON,D-53121 BONN,GERMANY. RP GAUME, RA (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7200,WASHINGTON,DC 20375, USA. NR 16 TC 4 Z9 4 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 APR 10 PY 1994 VL 425 IS 1 BP 127 EP 131 DI 10.1086/173969 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NE028 UT WOS:A1994NE02800014 ER PT J AU SCHMIEDER, B GOLUB, L ANTIOCHOS, SK AF SCHMIEDER, B GOLUB, L ANTIOCHOS, SK TI COMPARISON BETWEEN COOL AND HOT PLASMA BEHAVIORS OF SURGES SO ASTROPHYSICAL JOURNAL LA English DT Article DE PLASMAS; SUN, ACTIVITY; SUN, CHROMOSPHERE; SUN, CORONA; SUN, MAGNETIC FIELDS ID H-ALPHA; X-RAY; TRANSITION REGION; ACTIVE REGION; CORONAL LOOPS; C-IV; SOLAR; SPICULES; EMISSION; DYNAMICS AB Ground-based coordinated observations with the Multichannel Subtractive Double Pass spectrograph (MSDP) allowed us to obtain chromospheric intensity and velocity field maps below coronal structures during the launch of the NIXT payload on 1991 July 11 (eclipse day). A large Halpha ejection in AR 6713 (N38 W40) was detected during the NIXT flight. However, only a low level of X-ray emission was associated with this event. In contrast, bright X-ray emission associated with a subflare was observed in a nearby active region, but with only a weak associated ejection in Halpha. A discussion of both of these events gives strong constraints on the triggering mechanisms of surges. C1 HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. USN,RES LAB,WASHINGTON,DC 20375. RI Antiochos, Spiro/D-4668-2012; OI Antiochos, Spiro/0000-0003-0176-4312; Golub, Leon/0000-0001-9638-3082 NR 28 TC 36 Z9 37 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 APR 10 PY 1994 VL 425 IS 1 BP 326 EP & DI 10.1086/173987 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NE028 UT WOS:A1994NE02800032 ER PT J AU NIELSEN, AT CHRISTIAN, SL CHAFIN, AP WILSON, WS AF NIELSEN, AT CHRISTIAN, SL CHAFIN, AP WILSON, WS TI SYNTHESIS OF TETRANITROTOLUENES SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID POLYNITRO COMPOUNDS; OXIDATION AB New synthetic routes to the three isomeric tetranitrotoluenes 1-3 are described, including the previously unreported 2,3,4,5-tetranitrotoluene (1). Methods include peroxydisulfuric acid oxidation of trinitrotoluidines and hypophosphorous acid reduction of diazonium salts derived from tetranitrotoluidines. Synthesis of selected trinitrotoluidine precursors is also discussed. RP NIELSEN, AT (reprint author), USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 36 TC 2 Z9 2 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD APR 8 PY 1994 VL 59 IS 7 BP 1714 EP 1718 DI 10.1021/jo00086a020 PG 5 WC Chemistry, Organic SC Chemistry GA NF807 UT WOS:A1994NF80700020 ER EF