FN Thomson Reuters Web of Science™ VR 1.0 PT J AU GARRETT, SL ADEFF, JA HOFLER, TJ AF GARRETT, SL ADEFF, JA HOFLER, TJ TI THERMOACOUSTIC REFRIGERATOR FOR SPACE APPLICATIONS SO JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER LA English DT Article ID HEAT ENGINE AB A new spacecraft cryocooler which uses resonant high-amplitude sound waves in inert gases to pump heat is described. The phasing of the thermoacoustic cycle is provided by thermal conduction. This ''natural'' phasing allows the entire refrigerator to operate with only one moving part (the loudspeaker diaphragm). A space-qualified thermoacoustic refrigerator was flown on the Space Shuttle Discovery (STS-42) in January, 1992. It was entirely autonomous, had no sliding seals, required no lubrication, used mostly low-tolerance machined parts, and contained no expensive components. Thermoacoustics is shown to be a competitive candidate for food refrigerator/freezers and commercial/residential air conditioners. The design and performance of the Space ThermoAcoustic Refrigerator (STAR) is described. RP GARRETT, SL (reprint author), USN,POSTGRAD SCH,DEPT PHYS,CODE PH GX,MONTEREY,CA 93943, USA. NR 23 TC 76 Z9 81 U1 5 U2 18 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0887-8722 J9 J THERMOPHYS HEAT TR JI J. Thermophys. Heat Transf. PD OCT-DEC PY 1993 VL 7 IS 4 BP 595 EP 599 DI 10.2514/3.466 PG 5 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MD879 UT WOS:A1993MD87900009 ER PT J AU CEBECI, T PLATZER, MF JANG, HM CHEN, HH AF CEBECI, T PLATZER, MF JANG, HM CHEN, HH TI AN INVISCID-VISCOUS INTERACTION APPROACH TO THE CALCULATION OF DYNAMIC STALL INITIATION ON AIRFOILS SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 01-04, 1992 CL COLOGNE, GERMANY ID FLOWS AB An interactive boundary-layer method is described for computing unsteady incompressible flows over airfoils, including the initiation of dynamic stall. The inviscid unsteady panel method developed by Platzer and Teng is extended to include viscous effects. The solutions of the boundary-layer equations are obtained with an inverse finite-difference method employing an interaction law based on the Hilbert integral, and the algebraic eddy-viscosity formulation of Cebeci and Smith. The method is applied to airfoils subject to periodic and ramp-type motions and its abilities are examined for a range of angles of attack, reduced frequency, and pitch rate. C1 NAVAL POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943. RP CEBECI, T (reprint author), CALIF STATE UNIV LONG BEACH,DEPT AEROSP ENGN,LONG BEACH,CA 90840, USA. NR 18 TC 10 Z9 10 U1 1 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD OCT PY 1993 VL 115 IS 4 BP 714 EP 723 DI 10.1115/1.2929307 PG 10 WC Engineering, Mechanical SC Engineering GA ME063 UT WOS:A1993ME06300009 ER PT J AU CAMPBELL, J IACONOCONNORS, L WALZ, S SCHULTZ, W AF CAMPBELL, J IACONOCONNORS, L WALZ, S SCHULTZ, W TI THE LANGAT MODEL FOR TICK-BORNE ENCEPHALITIS-VIRUS - SPECIFIC DETECTION BY RT-PCR SO JOURNAL OF VIROLOGICAL METHODS LA English DT Article DE LANGAT; REVERSE TRANSCRIPTASE POLYMERASE CHAIN REACTION; TICK-BORNE ENCEPHALITIS ID STRUCTURAL PROTEINS; FLAVIVIRUSES; SEQUENCE; AMPLIFICATION; INVITRO; DNA AB We have developed a reverse-transcriptase polymerase chain reaction assay for rapid detection of Langat (LGT) virus, a flavivirus that is closely related to the highly pathogenic tick-borne encephalitis (TBE) viruses. Unlike TBE viruses, LGT virus exhibits a significantly lower virulence for man. The assay serves as a safe alternative for the development and optimization of specific assays for the highly pathogenic subtypes of TBE viruses that are endemic throughout much of Europe, the former Soviet Union, and China. C1 USN,RES LAB,CTR BIOMOLEC SCI,CODE 6900,WASHINGTON,DC 20375. USA,MED RES INST INFECT DIS,FREDERICK,MD 21701. NR 13 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-0934 J9 J VIROL METHODS JI J. Virol. Methods PD OCT PY 1993 VL 44 IS 2-3 BP 235 EP 240 DI 10.1016/0166-0934(93)90058-Y PG 6 WC Biochemical Research Methods; Biotechnology & Applied Microbiology; Virology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Virology GA ME006 UT WOS:A1993ME00600009 PM 7505284 ER PT J AU GOLDMAN, L AF GOLDMAN, L TI MORE TRUTH ABOUT LASERS IN SURGERY SO LASER FOCUS WORLD LA English DT Letter C1 USN,MED CTR,SAN DIEGO,CA 92132. RP GOLDMAN, L (reprint author), UNIV CINCINNATI,SCH MED,CINCINNATI,OH 45221, USA. NR 1 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 OCT PY 1993 VL 29 IS 10 BP 61 EP 61 PG 1 WC Optics SC Optics GA MC390 UT WOS:A1993MC39000018 ER PT J AU RENEKER, MH AF RENEKER, MH TI A QUALITATIVE STUDY OF INFORMATION-SEEKING AMONG MEMBERS OF AN ACADEMIC COMMUNITY - METHODOLOGICAL ISSUES AND PROBLEMS SO LIBRARY QUARTERLY LA English DT Article ID NEEDS; USER AB The information-seeking activities of thirty-one members of the Stanford University academic community were examined over two-week periods during the 1990-91 academic year. The set of 2,050 information-seeking incidents gathered through informant tape recordings was supplemented by interviews and other textual data. Both qualitative and quantitative analyses were used to examine the information needs in relation to perceived environment, source use, personal characteristics, and satisfaction with the result of information seeking. The data reveal information seeking to be embedded in day-to-day tasks and relationships and triggered both by articulation of need and availability of information. The article describes the methodological approach of the study, the use of ETHNOGRAPH and SPSS/PC + software to facilitate data analysis, and the issues and problems that arose in the processes of using both quantitative and qualitative analytical methods. RP RENEKER, MH (reprint author), USN,POSTGRAD SCH,DUDLEY KNOX LIB,MONTEREY,CA 93943, USA. NR 25 TC 17 Z9 17 U1 3 U2 8 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0024-2519 J9 LIBR QUART JI Libr. Q. PD OCT PY 1993 VL 63 IS 4 BP 487 EP 507 PG 21 WC Information Science & Library Science SC Information Science & Library Science GA MC866 UT WOS:A1993MC86600006 ER PT J AU STEUER, RE SILVERMAN, J WHISMAN, AW AF STEUER, RE SILVERMAN, J WHISMAN, AW TI A COMBINED CHEBYSHEV ASPIRATION CRITERION VECTOR INTERACTIVE MULTIOBJECTIVE PROGRAMMING PROCEDURE SO MANAGEMENT SCIENCE LA English DT Article DE INTERACTIVE MULTIPLE OBJECTIVE PROGRAMMING; REFERENCE POINT METHOD; ASPIRATION CRITERION VECTORS; CHEBYSHEV METHOD; MULTIPLE OBJECTIVE LINEAR PROGRAMMING ID OBJECTIVE LINEAR-PROGRAMS; MULTIPLE AB In this paper we combine the Tchebycheff method of Steuer and Choo with Wierzbicki's Aspiration Criterion Vector method in order to form an improved procedure for interactive multiple objective programming. The Combined procedure is sensible because the Tchebycheff and Aspiration Criterion Vector methods possess complementary distinguishing characteristics, solve similar optimization problems to probe the nondominated set, and share a similar computer / user interface. In the early iterations, Tchebycheff probes of the nondominated set might be conducted to locate promising neighborhoods of search. In later iterations, Aspiration Criterion Vector probes might be used to pinpoint a final solution. Computational experience is reported showing the improved effectiveness of the Combined Procedure when employed in this fashion when compared against the Tchebycheff and Aspiration Criterion Vector methods run separately. C1 USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92152. RP STEUER, RE (reprint author), UNIV GEORGIA,DEPT MANAGEMENT SCI & INFORMAT TECHNOL,ATHENS,GA 30602, USA. NR 27 TC 33 Z9 33 U1 0 U2 3 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 OCT PY 1993 VL 39 IS 10 BP 1255 EP 1260 DI 10.1287/mnsc.39.10.1255 PG 6 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA MD615 UT WOS:A1993MD61500011 ER PT J AU ALMETER, JM AF ALMETER, JM TI RESISTANCE PREDICTION OF PLANING HULLS - STATE-OF-THE-ART SO MARINE TECHNOLOGY AND SNAME NEWS LA English DT Article AB There are literally dozens of different ways that the boat designer can predict the resistance of planing hulls. The term planing hull is used generically to describe the majority of hard chine boats being built today. No single prediction method is good for all types of planing hulls. Some methods can be relied on to give good predictions for certain boats and other methods can't be relied upon at all. This paper is meant as a reference for designers in selecting resistance prediction methods for planing hulls. It describes numerous resistance prediction methods and gives their variable ranges and the type of planing hulls they are based on or are intended for. Inherent problems or limitations of the methods are stated. The concept of hull shape, which is often neglected in resistance prediction, and its important role are discussed. RP ALMETER, JM (reprint author), USN,CTR SURFACE WARFARE,DEPT COMBATANT CRAFT,DIV CARDEROCK,NORFOLK,VA 23511, USA. NR 0 TC 0 Z9 1 U1 0 U2 0 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 OCT PY 1993 VL 30 IS 4 BP 297 EP 307 PG 11 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA MD397 UT WOS:A1993MD39700006 ER PT J AU KANDRA, JT MAHAPATRA, R LEE, EW AF KANDRA, JT MAHAPATRA, R LEE, EW TI ON THE DEFORMATION-BEHAVIOR OF SINGLE-CRYSTALLINE FE-AL SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT CONF ON THE SCIENCE OF ORDERED INTERMETALLIC ALLOYS - STRUCTURAL MATERIALS : PROPERTIES, MICROSTRUCTURE AND PROCESSING CY OCT 14-15, 1992 CL NAVAL SURFACE WARFARE CTR, ANNAPOLIS, MD SP USN, OFF NAVAL RES HO NAVAL SURFACE WARFARE CTR ID CENTERED CUBIC METALS; SCREW DISLOCATION CORE; NON-GLIDE STRESSES; TEMPERATURE-DEPENDENCE; ORDERED ALLOYS; ORIENTATION AB Compression tests were performed on two single crystalline alloys with the B2 (CsCl) crystal structure, FeAl and Fe-45Al. Testing was done in air and test temperatures ranged from room temperature to 1273 K. Results show that limited {123} slip was produced in FeAl at low temperatures followed by the addition of {110} slip. {211} slip was produced in the Fe-45Al alloy up to 1073 K after which {110} slip was also observed. The flow stress vs. temperature curve of FeAl showed high compressive stresses up to 973 K followed by a large decrease in stress with increasing temperature. The flow stress versus temperature curve for Fe-45Al showed a very weak temperature dependence up to 973 K followed by a gradual decrease in stress with increasing temperature. Below 973 K, the flow stress values of Fe-45Al were calculated to be 50 to 60% of the values of FeAl. RP KANDRA, JT (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,WARMINSTER,PA 18974, USA. NR 38 TC 3 Z9 3 U1 0 U2 0 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 OCT 1 PY 1993 VL 170 IS 1-2 BP 29 EP 38 DI 10.1016/0921-5093(93)90366-M PG 10 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA ME438 UT WOS:A1993ME43800005 ER PT J AU MEHL, MJ SINGH, DJ PAPACONSTANTOPOULOS, DA AF MEHL, MJ SINGH, DJ PAPACONSTANTOPOULOS, DA TI PROPERTIES OF ORDERED INTERMETALLIC ALLOYS - 1ST-PRINCIPLES AND APPROXIMATE METHODS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID ELASTIC-MODULI; METALS; POLYCRYSTALLINE; TEMPERATURE; CONSTANTS; EXCHANGE; ENERGIES; BEHAVIOR AB Intermetallic alloys which can be made ductile at low temperatures and strong at high temperatures are of great value as materials for current and future high technology applications. Computational physics is a useful tool for locating candidate materials. The current generation of first-principles techniques can be used to study ordered phases of candidate materials. The results of these calculations may be used to construct highly accurate model potentials which can then be used to study systems containing thousands of atoms, including impurities, voids, defects and cracks. First-principles calculations are used to compute the elastic constants of a wide range of monatomic metals and ordered binary intermetallic alloys. The results are usually within 10% of the experimentally determined values. We also examine some of the high melting temperature A15 compounds. Total energy calculations for a simplified model of an antiphase boundary are presented. These results can be used to calibrate model potentials for use in studying the energy of isolated defects. Finally, we study the possibility of using the Harris functional to speed total energy calculations. RP USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RI Singh, David/I-2416-2012; Mehl, Michael/H-8814-2016 NR 37 TC 21 Z9 21 U1 1 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5093 EI 1873-4936 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD OCT 1 PY 1993 VL 170 IS 1-2 BP 49 EP 57 DI 10.1016/0921-5093(93)90368-O PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA ME438 UT WOS:A1993ME43800007 ER PT J AU SADANANDA, K FENG, CR AF SADANANDA, K FENG, CR TI CREEP OF INTERMETALLIC COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT CONF ON THE SCIENCE OF ORDERED INTERMETALLIC ALLOYS - STRUCTURAL MATERIALS : PROPERTIES, MICROSTRUCTURE AND PROCESSING CY OCT 14-15, 1992 CL NAVAL SURFACE WARFARE CTR, ANNAPOLIS, MD SP USN, OFF NAVAL RES HO NAVAL SURFACE WARFARE CTR ID MOLYBDENUM DISILICIDE COMPOSITES; TIAL ALLOY; GRAIN-SIZE; DEFORMATION; BEHAVIOR; CAST AB The creep behavior of nickel and titanium aluminides, molybdenum silicides, and their composites was evaluated as a function of stress and temperature to identify the effect of reinforcements on the creep resistance of these compounds. The deformation behavior was analyzed using a power-taw creep equation. The experimentally determined activation energies and stress exponents were related to the rate-controlling mechanisms for each system. With reinforcements, there is no improvement in the creep strength in TiAl, some improvement in NiAl, particularly at low stresses, and notable improvement in MoSi and its alloys. Comparative analysis of the creep resistance of aluminides, silicides and the currently used superalloys was also provided. On the basis of the creep resistance, it was concluded that MoSi and its composites have high potential for application at temperatures greater than 1000-degrees-C, and that they are potential competitors to somewhat more brittle ceramic-ceramic composites. RP SADANANDA, K (reprint author), USN, RES LAB, DIV MAT SCI & TECHNOL, WASHINGTON, DC 20375 USA. NR 46 TC 19 Z9 19 U1 0 U2 2 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 OCT 1 PY 1993 VL 170 IS 1-2 BP 199 EP 214 DI 10.1016/0921-5093(93)90381-N PG 16 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA ME438 UT WOS:A1993ME43800020 ER PT J AU ETTER, RJ WILSON, MB AF ETTER, RJ WILSON, MB TI TESTING SHIP DESIGNS IN A WATER TUNNEL SO MECHANICAL ENGINEERING LA English DT Article RP ETTER, RJ (reprint author), USN,CTR WARFARE,CARDEROCK DIV,LARGE CAVITAT CHANNEL PROJECT OFF,BETHESDA,MD 20814, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0025-6501 J9 MECH ENG JI Mech. Eng. PD OCT PY 1993 VL 115 IS 10 BP 74 EP 80 PG 7 WC Engineering, Mechanical SC Engineering GA MB761 UT WOS:A1993MB76100014 ER PT J AU LOUAT, N SADANANDA, K DUESBERY, M VASUDEVAN, AK AF LOUAT, N SADANANDA, K DUESBERY, M VASUDEVAN, AK TI A THEORETICAL EVALUATION OF CRACK CLOSURE SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID PLANE-STRAIN; ELEMENT AB Premature crack closure has been considered an important factor affecting the applied driving force under cyclic load. Among several factors that induce crack closure, plasticity and oxidation or corrosion have been recognized as the most significant. An analytical estimation of both is made using dislocation theory. The analysis indicates that (a) plasticity originating from crack tip does not induce crack closure and (b) closure arising from asperity ridges due to oxides, corrosion products or surface roughness is small and insignificant unless crack is completely packed with asperities. C1 OFF NAVAL RES,ARLINGTON,VA 22217. USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375. RP LOUAT, N (reprint author), FAIRFAX MAT GRP,ARLINGTON,VA 22310, USA. NR 16 TC 79 Z9 79 U1 1 U2 6 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD OCT PY 1993 VL 24 IS 10 BP 2225 EP 2232 DI 10.1007/BF02648597 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA MA551 UT WOS:A1993MA55100011 ER PT J AU METZBOWER, EA AF METZBOWER, EA TI KEYHOLE FORMATION SO METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY LA English DT Article ID PENETRATION AB The size and temperature of the ''keyhole'' and melt pool on the top surface of a metal plate being welded with a keyhole have been calculated, based on the power loss resulting from evaporation of an element in the chemistry of the plate and a minimum power density required to produce a keyhole. The evaporative power loss is set equal to the Gaussian power density which is used to represent the laser beam. The result is a temperature distribution across the keyhole. The results indicate that peak powers below the minimum peak power density yield temperatures that are indicative of melting only; peak powers equal to a minimum power density yield temperatures that reach the evaporation temperature of the element; and peak powers greater than the minimum power density yield temperatures greater than the evaporation temperature of the element. The results will be compared to some visual observations of the laser melt RP METZBOWER, EA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 28 Z9 29 U1 0 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2141 J9 METALL TRANS B PD OCT PY 1993 VL 24 IS 5 BP 875 EP 880 DI 10.1007/BF02663148 PG 6 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA LY902 UT WOS:A1993LY90200017 ER PT J AU SMITH, PL LEAN, JL CHRISTENSEN, AB HARVEY, KL JUDGE, DL MOORE, RL TORR, MR WOODS, TN AF SMITH, PL LEAN, JL CHRISTENSEN, AB HARVEY, KL JUDGE, DL MOORE, RL TORR, MR WOODS, TN TI SOURCE - THE SOLAR ULTRAVIOLET-RADIATION AND CORRELATIVE EMISSIONS MISSION SO METROLOGIA LA English DT Article ID IRRADIANCE VARIATIONS; FLUX; MODEL AB The Solar Ultraviolet Radiation and Correlative Emissions (SOURCE) mission is intended to advance our ability to specify the spectral irradiance of the Sun in the extreme ultraviolet (EUV) wavelength range through simultaneous, radiometrically accurate measurements of the solar EUV spectral irradiance and measurements, including EUV and visible images, of solar parameters that are correlated with the EUV flux. The data will be used in combination with empirical modelling to develop and validate a more accurate system of proxy, or surrogate, indices for the solar EUV flux. C1 AEROSP CORP,LOS ANGELES,CA 90009. SOLAR PHYS RES CORP,TUCSON,AZ 85718. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. UNIV SO CALIF,CTR SPACE SCI,LOS ANGELES,CA 90089. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. HIGH ALTITUDE OBSERV,BOULDER,CO 80307. RP SMITH, PL (reprint author), USN,RES LAB,DIV SPACE SCI,WASHINGTON,DC 20375, USA. OI Lean, Judith/0000-0002-0087-9639 NR 24 TC 0 Z9 0 U1 0 U2 0 PU BUREAU INT POIDS MESURES PI SEVRES CEDEX PA B1 PM PAVILLION DE BRETUEIL, F-92312 SEVRES CEDEX, FRANCE SN 0026-1394 J9 METROLOGIA JI Metrologia PD OCT PY 1993 VL 30 IS 4 BP 275 EP 277 DI 10.1088/0026-1394/30/4/011 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MN836 UT WOS:A1993MN83600012 ER PT J AU NEWMAN, HS CULBERTSON, JC AF NEWMAN, HS CULBERTSON, JC TI MEASUREMENT OF THE CURRENT-DENSITY DISTRIBUTION IN HIGH-TEMPERATURE SUPERCONDUCTING MICROSTRIP BY MEANS OF KINETIC-INDUCTANCE PHOTORESPONSE SO MICROWAVE AND OPTICAL TECHNOLOGY LETTERS LA English DT Article DE SUPERCONDUCTOR; MICROSTRIP; CURRENT DENSITY; SPATIAL DISTRIBUTION; KINETIC INDUCTANCE; PHOTORESPONSE AB We report a technique for measuring the spatial profile of microwave-frequency currents in resonant thin-film superconducting microstrip devices operated near resonance. We probe the patterned superconducting device as a function of position by scanning a modulated light beam across the region to be probed. With the light focused to a spot size much smaller than the microstrip width, we have measured the current density distribution as a function of position across the width of the strip. Using an elementary model for the superconducting current density distribution, we fit an effective penetration depth at the edge of the microstrip. (C) 1993 John Wiley & Sons, Inc. RP NEWMAN, HS (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 0 TC 13 Z9 13 U1 0 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0895-2477 J9 MICROW OPT TECHN LET JI Microw. Opt. Technol. Lett. PD OCT PY 1993 VL 6 IS 13 BP 725 EP 728 DI 10.1002/mop.4650061303 PG 4 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA LY906 UT WOS:A1993LY90600002 ER PT J AU BARR, D WEIR, M HOFFMAN, J AF BARR, D WEIR, M HOFFMAN, J TI AN INDICATOR OF COMBAT SUCCESS SO NAVAL RESEARCH LOGISTICS LA English DT Article AB Assessing the effects of changes in weapons systems or battle tactics is difficult because of the variations in battles and the resulting instability of measures of combat effectiveness. Even under the relatively stable conditions of designed combat exercises, traditional measures may fail to reflect important battle events and dynamics. This variation in results makes the design, conduct, and evaluation of combat experiments, combat simulations, and combat training exercises a challenging endeavor, indeed. We develop and examine a combat measure of effectiveness, based on Lanchester models, which we call the battle trace. The battle trace is a measure of ongoing battle results, measured as a function of time into the battle. We describe how such measures might contribute to assessing effects of changing certain battle parameters. We suggest applications of these ideas to developing combat simulations and to enhancing combat training exercises. (C) 1993 John Wiley & Sons, Inc. C1 USN,SCH POSTGRAD,DEPT MATH,MONTEREY,CA 93943. COLORADO SCH MINES,DEPT MATH,GOLDEN,CO 80401. RP BARR, D (reprint author), US MIL ACAD,DEPT SYST ENGN,W POINT,NY 10996, USA. NR 11 TC 0 Z9 0 U1 1 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD OCT PY 1993 VL 40 IS 6 BP 755 EP 768 DI 10.1002/1520-6750(199310)40:6<755::AID-NAV3220400603>3.0.CO;2-L PG 14 WC Operations Research & Management Science SC Operations Research & Management Science GA LY344 UT WOS:A1993LY34400001 ER PT J AU KURYLO, DD CORKIN, S ALLARD, T ZATORRE, RJ GROWDON, JH AF KURYLO, DD CORKIN, S ALLARD, T ZATORRE, RJ GROWDON, JH TI AUDITORY FUNCTION IN ALZHEIMERS-DISEASE SO NEUROLOGY LA English DT Article ID SHORT-TERM-MEMORY; SOUND-LOCALIZATION; HEARING IMPAIRMENT; COMPLEX TONES; CORTEX; PITCH; DEMENTIA; LESIONS; DISCRIMINATION; PERCEPTION AB The pattern of cerebral degeneration in Alzheimer's disease (AD) patients suggests that basic auditory capacities should be normal in AD, whereas progressively higher levels of auditory function should be increasingly impaired. To test this hypothesis, we administered tests of auditory capacities associated with primary auditory cortex (sound localization and perception of complex tones) and auditory association cortex (phoneme discrimination, timbre discrimination, and tonal memory) to 19 mildly to moderately demented AD patients, 21 elderly control subjects (ECS), and 14 young control subjects (YCS). The results showed significant differences between YCS and ECS on phoneme discrimination with synthetic speech and on tonal memory. The AD group differed from the ECS group on sound localization, one measure of synthetic speech discrimination, and timbre discrimination. Performance did not correlate with age, dementia severity, or duration of illness on any test condition. These findings indicate that although AD is accompanied by specific auditory deficits, the increase in neuropathologic change between primary auditory and auditory association cortices is not reflected in an increased impairment of functions that are mediated by these areas. Degraded aural language comprehension, which is characteristic of AD, likely reflects disruption of language processes rather than dysfunction specific to auditory circuits. C1 MIT,CLIN RES CTR,CAMBRIDGE,MA 02139. OFF NAVAL RES,DIV COGNIT & NEURAL SCI,ARLINGTON,VA. MONTREAL NEUROL HOSP & INST,MONTREAL H3A 2B4,QUEBEC,CANADA. MASSACHUSETTS GEN HOSP,DEPT NEUROL,BOSTON,MA 02114. RP KURYLO, DD (reprint author), MIT,DEPT BRAIN & COGNIT SCI,E10-001,CAMBRIDGE,MA 02139, USA. FU NCRR NIH HHS [RR00088]; NIA NIH HHS [R01AG09117] NR 40 TC 36 Z9 37 U1 1 U2 5 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0028-3878 J9 NEUROLOGY JI Neurology PD OCT PY 1993 VL 43 IS 10 BP 1893 EP 1899 PG 7 WC Clinical Neurology SC Neurosciences & Neurology GA MC704 UT WOS:A1993MC70400006 PM 8413944 ER PT J AU WAX, JR CHRISTIE, TL AF WAX, JR CHRISTIE, TL TI COMPLETE SMALL-BOWEL VOLVULUS COMPLICATING THE 2ND TRIMESTER SO OBSTETRICS AND GYNECOLOGY LA English DT Article ID MIDGUT VOLVULUS; PREGNANCY; OBSTRUCTION AB Background. Volvulus is the second most common cause of intestinal obstruction in pregnancy. Rarely is the small bowel involved, and even less frequently is the volvulus complete. Case: The patient was referred at 24 weeks and 4 days' gestation for persistent anorexia, emesis, and abdominal distention. History, physical examination, and abdominal radiographs were consistent with a complete small-bowel obstruction. Laparotomy revealed two adhesive bands, which were lysed, and a 360-degrees volvulus of the small bowel about its mesentery, which was successfully reduced. Conclusion: This patient represents a case of complete small-bowel volvulus successfully treated in the second trimester by detorsion. RP WAX, JR (reprint author), USN HOSP,DEPT OBSTET & GYNECOL,DIV MATERNAL FETAL MED,PORTSMOUTH,VA 23708, USA. NR 11 TC 14 Z9 14 U1 0 U2 1 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 OCT PY 1993 VL 82 IS 4 BP 689 EP 691 PN 2 PG 3 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA LY728 UT WOS:A1993LY72800020 PM 8378014 ER PT J AU MADER, TH ARAGONES, JV CHANDLER, AC HAZLEHURST, JA HEIER, J KINGHAM, JD STEIN, E AF MADER, TH ARAGONES, JV CHANDLER, AC HAZLEHURST, JA HEIER, J KINGHAM, JD STEIN, E TI OCULAR AND OCULAR ADNEXAL INJURIES TREATED BY UNITED-STATES MILITARY OPHTHALMOLOGISTS DURING OPERATIONS DESERT SHIELD AND DESERT-STORM SO OPHTHALMOLOGY LA English DT Article; Proceedings Paper CT 1992 ANNUAL MEETING OF THE AMERICAN-ACADEMY-OF-OPHTHALMOLOGY CY NOV, 1992 CL DALLAS, TX SP AMER ACAD OPHTHALMOL ID EYE INJURIES; LEBANON WAR; PROTECTION AB Background. Ocular and ocular adnexal injuries, both combat-related and accidental, are common during wartime. In a combat setting, the eye is particularly vulnerable to serious injury from tiny flying particles that might minimally affect other parts of the body. The purpose of this study is to examine the incidence of serious ocular and ocular adnexal injuries that occurred during Operations Desert Shield and Desert Storm. Methods: The authors retrospectively reviewed serious ocular and ocular adnexal injuries treated by United States Army and Navy ophthalmologists that occurred during Operations Desert Shield and Desert Storm. Only those injuries that resulted in, or would have resulted in, hospital admission because of the ocular or ocular adnexal injury alone are presented. Results: During Desert Shield, 20 patients (23 eyes) suffered serious ocular or ocular adnexal injuries compared with 160 patients (1 98 eyes) in Desert Storm. During Desert Storm, 78% of all serious injuries were caused by blast fragmentation from munitions. More than one third of the 98 globe lacerations reported in this article were 10 mm or less in size. Of 35 enucleations performed during Desert Storm, 94% were the result of munitions fragments. Conclusions: During Operation Desert Storm, fragmentation wounds from munitions were the most common cause of ocular and ocular adnexal morbidity. The authors' findings indicate that polycarbonate ballistic protective eyewear could have prevented many of the ocular injuries that they report. C1 USA,FITZSIMONS ARMY MED CTR,AURORA,CO. USA RESERVE,ROCHESTER,MI. USA RESERVE,DURHAM,NC. USN,CHICO,CA. RP MADER, TH (reprint author), USA,MADIGAN ARMY MED CTR,OPHTHALMOL SERV,TACOMA,WA 98431, USA. NR 11 TC 45 Z9 45 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0161-6420 J9 OPHTHALMOLOGY JI Ophthalmology PD OCT PY 1993 VL 100 IS 10 BP 1462 EP 1467 PG 6 WC Ophthalmology SC Ophthalmology GA MA307 UT WOS:A1993MA30700016 PM 8414405 ER PT J AU CALVERT, JM KOLOSKI, TS DRESSICK, WJ DULCEY, CS PECKERAR, MC CERRINA, F TAYLOR, JW SUH, DW WOOD, OR MACDOWELL, AA DSOUZA, R AF CALVERT, JM KOLOSKI, TS DRESSICK, WJ DULCEY, CS PECKERAR, MC CERRINA, F TAYLOR, JW SUH, DW WOOD, OR MACDOWELL, AA DSOUZA, R TI PROJECTION X-RAY-LITHOGRAPHY WITH ULTRATHIN IMAGING LAYERS AND SELECTIVE ELECTROLESS METALLIZATION SO OPTICAL ENGINEERING LA English DT Article DE MICROLITHOGRAPHY; PROJECTION X-RAY LITHOGRAPHY; DEEP-UV LITHOGRAPHY; SELF-ASSEMBLED MONOLAYERS; ELECTROLESS DEPOSITION; PHOTOCHEMISTRY; ORGANOSILANES ID DEEP UV PHOTOCHEMISTRY; MONOLAYER FILMS AB Soft x-ray synchrotron radiation, of wavelength 14 nm, is used to pattern self-assembled monolayer films, which are then selectively metallized using electroless deposition. Organosilane precursors of the general type RSiX3 (R= organic functional group; X = Cl, OCH3) are used to form covalently bound ultrathin films by molecular self-assembly on Si wafers. These films are approximately one monolayer (approximately 1 nm) thick. X-ray exposure is used to remove or transform the R groups in selected areas of the film. The laterally patterned reactivity on the surface is then used as a template for the additive deposition of a thin layer of electroless nickel in the unexposed regions. The Ni metal layer can then be used as a plasma etch mask for pattern transfer. Metal features with linewidths less-than-or-equal-to 0.25 mum are produced with exposure doses of 50 mJ/cm2. C1 USN,RES LAB,DIV ELECTR,WASHINGTON,DC 20375. UNIV WISCONSIN,CTR XRAY LITHOG,DEPT ELECT & COMP ENGN,MADISON,WI 53706. UNIV WISCONSIN,CTR XRAY LITHOG,DEPT CHEM,MADISON,WI 53706. AT&T BELL LABS,HOLMDEL,NJ 07733. AT&T BELL LABS,UPTON,NY 11973. RP CALVERT, JM (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 30 TC 28 Z9 28 U1 0 U2 1 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 OCT PY 1993 VL 32 IS 10 BP 2437 EP 2445 DI 10.1117/12.146857 PG 9 WC Optics SC Optics GA MC097 UT WOS:A1993MC09700017 ER PT J AU DOBISZ, EA MARRIAN, CRK SALVINO, RE ANCONA, MA RHEE, KW PECKERAR, MC AF DOBISZ, EA MARRIAN, CRK SALVINO, RE ANCONA, MA RHEE, KW PECKERAR, MC TI THIN SILICON-NITRIDE FILMS TO INCREASE RESOLUTION IN E-BEAM LITHOGRAPHY SO OPTICAL ENGINEERING LA English DT Article DE MICROLITHOGRAPHY; ELECTRON-BEAM LITHOGRAPHY; PROXIMITY EFFECTS; NANOLITHOGRAPHY ID PROXIMITY CORRECTION; ELECTRON AB A physical method of reducing feature size and proximity effects in sub-quarter-micrometer e-beam lithography is described. A thin layer (50 to 300 nm) of silicon nitride deposited on a semiconductor substrate, prior to resist deposition, has been found to enhance the resist resolution. The samples were patterned with a 50-keV, 15-nm-diam probe generated by a JEOL JBX-5DII e-beam lithography system. Point spread function measurements in 60-nm-thick SAL-601 on Si are shown to illustrate the resolution enhancement in the nanolithographic regime (sub-100 nm). The technique has been applied to lithography on 400-nm-thick W films, such as would be used in x-ray mask fabrication. The 200 nm of SAL-601 was spun onto W film samples, which were half-coated with 200 nm of silicon nitride. Identical lithographic patterns were written on each half of the sample. On examination of the samples after postexposure processing and development, reduced feature sizes and proximity effects were seen on the sample half with the silicon nitride intermediary layer. For example, in a field effect transistor (FET) type pattern, with a coded 500-nm gap between the source and drain pads, the gate could only be successfully resolved when the intermediary nitride layer was present. Monte Carlo simulations were performed on a CM-200 connection machine. The results show a large number of fast secondary electrons are generated within a 100-nm radius of the incident electron beam. The implications of fast secondary electrons on resolution in e-beam lithography are discussed. The total number of fast secondary electrons entering the resist is reduced by the silicon nitride layer. Simulations compare the thin-layer technique to a bilayer resist technique, used to improve resolution at larger dimensions. RP DOBISZ, EA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 1 Z9 1 U1 1 U2 3 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 OCT PY 1993 VL 32 IS 10 BP 2452 EP 2458 DI 10.1117/12.145970 PG 7 WC Optics SC Optics GA MC097 UT WOS:A1993MC09700019 ER PT J AU CLEMENT, AE GILBREATH, GC PETERSON, SN AF CLEMENT, AE GILBREATH, GC PETERSON, SN TI DETERMINATION OF THE EFFECTIVE TRAP DENSITY OF TA-KNBO3 AND BATIO3 AT 823 NM USING THE SHALLOW TRAP MODEL SO OPTICS AND LASER TECHNOLOGY LA English DT Article DE PHOTOREFRACTIVE MIXING; BATIO3; KNBO3; TRAP DENSITY ID PHOTOREFRACTIVE PROPERTIES; BARIUM-TITANATE; CRYSTALS; ABSORPTION; BI12SIO20; KNBO3 AB Using the shallow-trap model, the effective trap density in Ta:KNbO3 and BaTiO3 is measured at 823 nm using a laser diode and is compared with values at 514.5 nm. A reduction of trap density is shown at the longer wavelengths. Exponential gain coefficients are given as a function of geometry for both crystals in the near-infra red. The effect of angular bandwidth on gain and its effect on image amplification is also examined. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP CLEMENT, AE (reprint author), USN,RES LAB,ELECTROOPT TECHNOL SECT,CODE 8123,WASHINGTON,DC 20375, USA. NR 21 TC 2 Z9 2 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0030-3992 J9 OPT LASER TECHNOL JI Opt. Laser Technol. PD OCT PY 1993 VL 25 IS 5 BP 299 EP 303 DI 10.1016/0030-3992(93)90017-A PG 5 WC Optics; Physics, Applied SC Optics; Physics GA MB062 UT WOS:A1993MB06200003 ER PT J AU MOON, JA MAHON, R DUNCAN, MD REINTJES, J AF MOON, JA MAHON, R DUNCAN, MD REINTJES, J TI RESOLUTION LIMITS FOR IMAGING THROUGH TURBID MEDIA WITH DIFFUSE LIGHT SO OPTICS LETTERS LA English DT Article ID OPTICAL-PROPERTIES; TIME; SCATTERING; TRANSILLUMINATION; TISSUE AB We present analytic expressions for the achievable resolution for imaging through a turbid medium with multiply scattered light in the diffusion limit. We find that for detectable levels of light the spatial resolution R (the halfwidth of the point-spread function) scales with thickness d of the sample as R congruent-to (0.2 +/- 0.04)d over 10 orders of magnitude in input intensity and transport length. Experiments with a time-gated stimulated Raman amplifier are in good agreement with the calculations. C1 JAYCOR,VIENNA,VA 22180. RP MOON, JA (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 5640,WASHINGTON,DC 20375, USA. NR 15 TC 51 Z9 51 U1 1 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 1 PY 1993 VL 18 IS 19 BP 1591 EP 1593 DI 10.1364/OL.18.001591 PG 3 WC Optics SC Optics GA LY623 UT WOS:A1993LY62300004 PM 19823455 ER PT J AU JUSTUS, BL KAFAFI, ZH HUSTON, AL AF JUSTUS, BL KAFAFI, ZH HUSTON, AL TI EXCITED-STATE ABSORPTION-ENHANCED THERMAL OPTICAL LIMITING IN C-60 SO OPTICS LETTERS LA English DT Article AB We report on optical limiting of Q-switched Nd:YAG radiation at 532 nm in an f/5 defocusing geometry using liquid solutions of C60 in 1-chloronaphthalene. The nonlinear optical-limiting mechanism is C60 excited-state absorption and enhanced thermal lensing in the solvent. A limiting threshold energy of 65 nJ, corresponding to an incident fluence of approximately 0.3 J/cm2 at the focus in the solution, was observed with a device absorption of 25%. RP JUSTUS, BL (reprint author), USN,RES LAB,OPT PHYS BRANCH,CODE 5610,WASHINGTON,DC 20375, USA. NR 14 TC 81 Z9 81 U1 1 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 1 PY 1993 VL 18 IS 19 BP 1603 EP 1605 DI 10.1364/OL.18.001603 PG 3 WC Optics SC Optics GA LY623 UT WOS:A1993LY62300008 PM 19823459 ER PT J AU DEMAIO, M PAINE, R MANGINE, RE DREZ, D AF DEMAIO, M PAINE, R MANGINE, RE DREZ, D TI PLANTAR FASCIITIS SO ORTHOPEDICS LA English DT Article C1 USN,OAKLAND,CA 94627. NR 0 TC 66 Z9 69 U1 0 U2 2 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0147-7447 J9 ORTHOPEDICS JI Orthopedics PD OCT PY 1993 VL 16 IS 10 BP 1153 EP 1163 PG 11 WC Orthopedics SC Orthopedics GA MB693 UT WOS:A1993MB69300010 PM 8255812 ER PT J AU LEWIS, DW AF LEWIS, DW TI HAIR BURNING SYNCOPE - REPLY SO PEDIATRICS LA English DT Letter RP LEWIS, DW (reprint author), USN HOSP,DEPT PEDIAT,PORTSMOUTH,VA 23708, USA. NR 0 TC 0 Z9 0 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 OCT PY 1993 VL 92 IS 4 BP 639 EP 639 PG 1 WC Pediatrics SC Pediatrics GA MA223 UT WOS:A1993MA22300038 ER PT J AU GERR, NL ALLEN, JC AF GERR, NL ALLEN, JC TI STOCHASTIC VERSIONS OF CHAOTIC TIME-SERIES - GENERALIZED LOGISTIC AND HENON TIME-SERIES MODELS SO PHYSICA D LA English DT Article ID DYNAMICS AB Deterministic time series models, particularly those which exhibit chaotic behavior, have received considerable attention recently as an alternative to stochastic time series models. In many cases there exists a well-defined stochastic time series model from which the deterministic time series model is obtained in the limit as the degree of stochasticity goes to zero. The stochastic version may then be used as a means for fitting the deterministic model. In this paper we introduce a stochastic generalized (parametric) logistic time series model. Using simulated data, we show that model fitting methods developed for the stochastic logistic time series also work in the deterministic case. We then use these methods to fit the logistic model to the weevil data of Utida. We introduce as well a stochastic quadratic time series model for which the deterministic Henon time series model is a limiting special case. Finally, we show how the stochastic version of a nonlinear deterministic time series model provides a mechanism for studying the stability of the deterministic model to small perturbations. C1 USN,CTR OCEAN SYST,DIV ASW TECHNOL,SAN DIEGO,CA 92152. RP GERR, NL (reprint author), OFF NAVAL RES,DIV MATH SCI,ARLINGTON,VA 22217, USA. NR 21 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD OCT 1 PY 1993 VL 68 IS 2 BP 232 EP 249 DI 10.1016/0167-2789(93)90082-C PG 18 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA MA864 UT WOS:A1993MA86400003 ER PT J AU LINDLE, JR PONG, RGS BARTOLI, FJ KAFAFI, ZH AF LINDLE, JR PONG, RGS BARTOLI, FJ KAFAFI, ZH TI NONLINEAR-OPTICAL PROPERTIES OF THE FULLERENES-C-60 AND FULLERENES-C-70 AT 1.064-MU-M SO PHYSICAL REVIEW B LA English DT Article ID C-60; C-70; C60; FILMS; BUCKMINSTERFULLERENE; DISPERSION; MOLECULES; CARBON; MODEL AB Time-resolved degenerate-four-wave-mixing experiments were conducted on films of pure C60 and C70 using a 35-ps laser at 1.064 mum. The fullerenes exhibit a two-photon resonantly enhanced third-order optical response that is primarily laser-pulse-limited. At high laser intensities, a fifth-order component to the nonlinear optical signal is observed and is attributed to a two-photon excited-state transient grating. The large two-photon absorption coefficients measured for C60 and C70 at 1.064 mum by nonlinear transmittance are consistent with this assignment. C1 USN,RES LAB,WASHINGTON,DC 20375. RI Lindle, James/A-9426-2009 NR 36 TC 62 Z9 62 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 OCT 1 PY 1993 VL 48 IS 13 BP 9447 EP 9451 DI 10.1103/PhysRevB.48.9447 PG 5 WC Physics, Condensed Matter SC Physics GA MC116 UT WOS:A1993MC11600033 ER PT J AU LARRAZA, A FALKOVICH, G AF LARRAZA, A FALKOVICH, G TI COLLECTIVE MODES IN OPEN SYSTEMS OF NONLINEAR RANDOM WAVES SO PHYSICAL REVIEW B LA English DT Note AB Nonlinear random classical waves driven far off equilibrium by the steady input of energy can support propagating collective modes analogous to zero sound in Fermi liquids. The conditions for the existence of these collisionless and dispersionless modes are presented. Applications to a variety of systems as well as experiments to test the theory are suggested. In particular, this article predicts that for gravity waves on the surface of a liquid both longitudinal and transverse collective modes are possible in the collisionless regime. C1 WEIZMANN INST SCI,DEPT PHYS,IL-76100 REHOVOT,ISRAEL. RP LARRAZA, A (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. RI FALKOVICH, GREGORY/K-1561-2012 NR 9 TC 3 Z9 3 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 OCT 1 PY 1993 VL 48 IS 13 BP 9855 EP 9857 DI 10.1103/PhysRevB.48.9855 PG 3 WC Physics, Condensed Matter SC Physics GA MC116 UT WOS:A1993MC11600091 ER PT J AU CARROLL, TL PECORA, LM AF CARROLL, TL PECORA, LM TI USING CHAOS TO KEEP PERIOD-MULTIPLIED SYSTEMS IN-PHASE SO PHYSICAL REVIEW E LA English DT Article ID NOISE-INDUCED CRISES; ATTRACTORS AB Periodically driven nonlinear systems can exhibit multiple-period behavior (period-2, period-3, etc.). Several such systems, when driven with the same drive, can be on identical attractors but remain out of phase with each other (e.g., one drive cycle for a period-doubled set of systems). This means that the basins of attraction for multiple-period systems can be divided into domains of attraction, one for each phase of the motion. A period-n attractor will have n domains of attraction in its basin. This out-of-phase situation is stable-small perturbations will not succeed in getting the systems in phase. We show that one can often use an almost periodic driving signal (generated from various chaotic systems) which will simultaneously (1) keep the motion of the systems nearly the same as the periodic driving case, (2) keep the basin of attraction nearly the same, and (3) eliminate the n domains of attraction. In other words, there will be only one domain for the basin. This means that any number of such driven systems will always be in phase. We display this effect in simulations and actual electrical circuits, discuss the mechanism for this effect (which is most likely a crisis), and speculate on some applications of the technique. RP CARROLL, TL (reprint author), USN,RES LAB,CODE 6341,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 27 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 OCT PY 1993 VL 48 IS 4 BP 2426 EP 2436 DI 10.1103/PhysRevE.48.2426 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA ME593 UT WOS:A1993ME59300022 ER PT J AU ESAREY, E RIDE, SK SPRANGLE, P AF ESAREY, E RIDE, SK SPRANGLE, P TI NONLINEAR THOMSON SCATTERING OF INTENSE LASER-PULSES FROM BEAMS AND PLASMAS SO PHYSICAL REVIEW E LA English DT Article ID FREE-ELECTRON LASER; ELECTROMAGNETIC-WAVES; GENERATION; RADIATION; BACKSCATTER; POWER AB A comprehensive theory is developed to describe the nonlinear Thomson scattering of intense laser fields from beams and plasmas. This theory is valid for linearly or circularly polarized incident laser fields of arbitrary intensities and for electrons of arbitrary energies. Explicit expressions for the intensity distributions of the scattered radiation are calculated and numerically evlauated. The space-charge electrostatic potential, which is important in high-density plasmas and prevents the axial drift of electrons, is included self-consistently. Various properties of the scattered radiation are examined, including the linewidth, angular distribution, and the behavior of the radiation spectra at ultrahigh intensities. Nonideal effects, such as electron-energy spread and beam emittance, are discussed. A laser synchrotron source (LSS), based on nonlinear Thomson scattering, may provide a practical method for generating tunable, near-monochromatic, well-collimated, short-pulse x rays in a compact, relatively inexpensive source. Two examples of possible LSS configurations are presented: an electron-beam LSS generating hard (30-keV, 0.4-angstrom) x rays and a plasma LSS generating soft (0.3-keV, 40-angstrom) x rays. These LSS configurations are capable of generating ultrashort (approximately 1-ps) x-ray pulses with high peak flux ( greater than or similar to 10(21) photons/s) and brightness [greater than or similar to 10(19) photons/(S mm2 mrad2), 0.1% bandwidth]. C1 UNIV CALIF SAN DIEGO,DEPT PHYS,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,CALIF SPACE INST,LA JOLLA,CA 92093. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 50 TC 294 Z9 300 U1 2 U2 30 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1993 VL 48 IS 4 BP 3003 EP 3021 DI 10.1103/PhysRevE.48.3003 PG 19 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA ME593 UT WOS:A1993ME59300082 ER PT J AU UHM, HS AF UHM, HS TI WAKE-FIELD ACCELERATOR IN A FERROMAGNETIC WAVE-GUIDE SO PHYSICAL REVIEW E LA English DT Note ID PLASMA; BEAM AB A novel high-gradient wake-field accelerator is presented in which the drive-beam current leaves behind a high-gradient wake field, accelerating the witness beam to very high energy. The theoretical analysis is based on Faraday's law, which provides a second-order partial differential equation of the azimuthal magnetic field, under the assumption that muepsilon >> 1. The accelerating field can be more than 1/2 GV/m in an appropriate choice of system parameters. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1993 VL 48 IS 4 BP 3161 EP 3164 DI 10.1103/PhysRevE.48.3161 PG 4 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA ME593 UT WOS:A1993ME59300099 ER PT J AU BULSARA, AR SCHIEVE, WC JACOBS, EW AF BULSARA, AR SCHIEVE, WC JACOBS, EW TI MELNIKOV FUNCTION AND HOMOCLINIC CHAOS INDUCED BY WEAK PERTURBATIONS - REPLY SO PHYSICAL REVIEW E LA English DT Letter ID MULTIPLICATIVE NOISE; COLORED-NOISE; SIMULATION; ALGORITHM AB For the case of weak perturbations, our theory is shown to reproduce exactly the results of Simiu and Frey [Phys. Rev. E 48, 3185 (1993)]. In the presence of weak noise, the two approaches yield different results. This can be traced to the neglect of diffusion effects in the Simiu-Frey theory; the inclusion of these effects, via an ensemble-averaged redefinition of the Melnikov function, leads to an additional term involving the noise variance. C1 UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712. RP BULSARA, AR (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152, USA. NR 10 TC 0 Z9 0 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD OCT PY 1993 VL 48 IS 4 BP 3193 EP 3195 DI 10.1103/PhysRevE.48.3193 PG 3 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA ME593 UT WOS:A1993ME59300108 ER PT J AU RIPIN, BH HUBA, JD MCLEAN, EA MANKA, CK PEYSER, T BURRIS, HR GRUN, J AF RIPIN, BH HUBA, JD MCLEAN, EA MANKA, CK PEYSER, T BURRIS, HR GRUN, J TI SUB-ALFVENIC PLASMA EXPANSION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LASER-PRODUCED PLASMA; RAYLEIGH-TAYLOR INSTABILITY; LARGE-LARMOR-RADIUS; MAGNETOTAIL BARIUM RELEASES; UNIFORM MAGNETIC-FIELD; ABLATIVE ACCELERATION; TARGET INTERACTION; SIMULATION; EVOLUTION; CLOUDS AB A large ion Larmor radius plasma undergoes a particularly robust form of Rayleigh-Taylor instability when sub-Alfvenically expanding into a magnetic field. Results from an experimental study of this instability are reported and compared with theory, notably a magnetohydrodynamic (MHD) treatment that includes the Hall term, a generalized kinetic lower-hybrid drift theory, and with computer simulations. Many theoretical predictions are confirmed while several features remain unexplained. New and unusual features appear in the development of this instability. In the linear stage there is an onset criterion insensitive to the magnetic field, initial density clumping (versus interchange), linear growth rate much higher than in the ''classic'' MHD regime, and dominant instability wavelength of order of the plasma density scale length. In the nonlinear limit free-streaming flutes, apparent splitting (bifurcation) of flutes, curling of flutes in the electron cyclotron sense, and a highly asymmetric expansion are found. Also examined is the effect on the instability of the following: an ambient background plasma (that adds collisionality and raises the expansion speed/Alfven speed ratio), magnetic-field line tying, and expansion asymmetries (that promotes plasma cross-field jetting). RP RIPIN, BH (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 66 TC 63 Z9 64 U1 4 U2 15 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1993 VL 5 IS 10 BP 3491 EP 3506 DI 10.1063/1.860825 PG 16 WC Physics, Fluids & Plasmas SC Physics GA MC104 UT WOS:A1993MC10400005 ER PT J AU HUBA, JD FEDDER, JA AF HUBA, JD FEDDER, JA TI SELF-GENERATION OF MAGNETIC-FIELDS BY SHEARED FLOWS IN WEAKLY IONIZED PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID COMET HALLEY; VENUS IONOSPHERE; GIOTTO; BOUNDARY AB A sheared, relative ion-neutral flow can generate a magnetic field in an unmagnetized, weakly ionized plasma. The field generation term is partial derivative B/partial derivative t = (m(e)c/e) del X nu(en) (V(i)- V(n)) where nu(en) is the electron-neutral collision frequency, V(i) is the ion fluid velocity, and V(n) is the neutral fluid velocity. The time period over which the field grows is limited by diffusion, convection, or collisional relaxation of the relative drift. Since the field generation term scales as V(en)/OMEGA(e) relative to the other terms in the field induction equation, the maximum field generated is found from OMEGA(e) congruent-to few nu(en) so that B(max) congruent-to few (m(e)c/e)nu(en). Both analytical and numerical results are presented. The computational results are based upon a two-dimensional (2-D) magnetohydrodynamic (MHD) code which includes the following terms: ion-neutral drag, gravity, resistivity, recombination, the Hall term, and the shear-driven source term. The theory is applied to the generation of magnetic fields in an unmagnetized planetary ionosphere, such as Venus, and to cometary plasmas. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 22 TC 21 Z9 21 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1993 VL 5 IS 10 BP 3779 EP 3788 DI 10.1063/1.860848 PG 10 WC Physics, Fluids & Plasmas SC Physics GA MC104 UT WOS:A1993MC10400029 ER PT J AU LEAN, J AF LEAN, J TI SUNS CHANGING UV FLUX HAS ATMOSPHERIC IMPLICATIONS SO PHYSICS WORLD LA English DT Article RP LEAN, J (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8585 J9 PHYS WORLD JI Phys. World PD OCT PY 1993 VL 6 IS 10 BP 27 EP 28 PG 2 WC Physics, Multidisciplinary SC Physics GA MB886 UT WOS:A1993MB88600020 ER PT J AU PAYNE, RD MORAN, AL CAMMARATA, RC AF PAYNE, RD MORAN, AL CAMMARATA, RC TI RELATING POROSITY AND MECHANICAL-PROPERTIES IN SPRAY FORMED TUBULARS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS DETACHMENT,ANNAPOLIS,MD 21402. USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21401. RP PAYNE, RD (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,102 MARYLAND HALL,CHARLES & 34TH ST,BALTIMORE,MD 21218, USA. RI Cammarata, Robert /A-3307-2010 NR 14 TC 37 Z9 37 U1 0 U2 1 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 OCT 1 PY 1993 VL 29 IS 7 BP 907 EP 912 DI 10.1016/0956-716X(93)90380-B PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LR756 UT WOS:A1993LR75600008 ER PT J AU SINGH, DJ AF SINGH, DJ TI CALCULATED ELECTRIC-FIELD GRADIENTS OF FERROELECTRIC KNBO3 SO SOLID STATE COMMUNICATIONS LA English DT Article ID BRILLOUIN-ZONE; INFRARED-SPECTROSCOPY; PHASE-TRANSITIONS; SPECIAL POINTS; TOTAL-ENERGY; DYNAMICS; ORIGIN; SITES AB Electric Field Gradients for KNbO3 in its rhombohedral ferroelectric ground state have been calculated using the self-consistent general potential linearized augmented planewave method. Calculations were also performed for KTaO3 constrained to be in the same structure, for comparison and to make contact with perturbed angular correlation spectroscopy experiments using Hf-181 probes. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 29 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD OCT PY 1993 VL 88 IS 4 BP 323 EP 325 DI 10.1016/0038-1098(93)90517-Q PG 3 WC Physics, Condensed Matter SC Physics GA MF758 UT WOS:A1993MF75800013 ER PT J AU KRUPPA, W BOOS, JB AF KRUPPA, W BOOS, JB TI LOW-FREQUENCY GAIN DISPERSION IN ION-IMPLANTED INP JFETS SO SOLID-STATE ELECTRONICS LA English DT Article ID GAAS-MESFETS; OUTPUT CONDUCTANCE; DLTS SPECTRA; TRANSCONDUCTANCE; TRAPS; SIMULATION AB The dispersion in the low-frequency transconductance and output resistance and its effect on the voltage gain of an ion-implanted InP JFET are reported. The dispersion consists of a reduction in both the transconductance and the output resistance occurring between 10 Hz and 1 MHz. The primary transconductance dispersion mechanism appears to be due to surface traps located in the ungated access regions, while the output resistance dispersion appears to be caused by traps located in the substrate under the channel. This conclusion is supported by transient response measurements. An equivalent circuit which simulates the dispersion is presented. This circuit can be used for the design of monolithic fiber-optic preamplifiers and other small-signal circuits. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRUPPA, W (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 29 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD OCT PY 1993 VL 36 IS 10 BP 1445 EP 1453 DI 10.1016/0038-1101(93)90053-S PG 9 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA LR660 UT WOS:A1993LR66000010 ER PT J AU FONTANELLA, JJ MCLIN, MG WINTERSGILL, MC CALAME, JP GREENBAUM, SG AF FONTANELLA, JJ MCLIN, MG WINTERSGILL, MC CALAME, JP GREENBAUM, SG TI ELECTRICAL-IMPEDANCE STUDIES OF ACID FORM NAFION(R) MEMBRANES SO SOLID STATE IONICS LA English DT Letter ID CONTAINING PERFLUOROSULFONATE IONOMERS; DIELECTRIC-RELAXATION; ION MOTIONS; SYSTEMS AB Electrical conductivity/dielectric relaxation studies of acid form NAFION-117 have been carried out at frequencies from 10 to 10(8) Hz. By direct measurement, it is shown that when ''standard'' two terminal measurements are made across the thickness of a 0.18 mm film, it is necessary to use frequencies in excess of 10(7) Hz in order to observe the bulk conductivity of the sample. As a consequence, previous reports of a power law dependence for the electrical conductivity are not associated with the bulk electrical conductivity but rather are due to electrode effects and space charge. As confirmation, it is shown that by changing the geometry of the electrodes, the low frequency electrical response of the material is significantly changed. C1 UNIV MARYLAND,DEPT ELECT ENGN,COLL PK,MD 20742. CUNY HUNTER COLL,DEPT PHYS,NEW YORK,NY 10021. RP FONTANELLA, JJ (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 10 TC 61 Z9 61 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD OCT PY 1993 VL 66 IS 1-2 BP 1 EP 4 DI 10.1016/0167-2738(93)90020-4 PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MH544 UT WOS:A1993MH54400001 ER PT J AU DECREDICO, MA AF DECREDICO, MA TI FINANCIAL FAILURE AND CONFEDERATE DEFEAT - BALL,DB SO SOUTHWESTERN HISTORICAL QUARTERLY 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 TEXAS STATE HIST ASSN PI AUSTIN PA 2/306 RICHARDSON HALL UNIV STATION, AUSTIN, TX 78712 SN 0038-478X J9 SOUTHWEST HIST QUART JI Southw. Hist. Q. PD OCT PY 1993 VL 97 IS 2 BP 399 EP 400 PG 2 WC History SC History GA ME604 UT WOS:A1993ME60400031 ER PT J AU SYMONDS, CL AF SYMONDS, CL TI BRAGG,BRAXTON AND CONFEDERATE DEFEAT, VOL 1 - MCWHINEY,G SO SOUTHWESTERN HISTORICAL QUARTERLY LA English DT Book Review RP SYMONDS, CL (reprint author), USN ACAD, ANNAPOLIS, MD 21402 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TEXAS STATE HIST ASSOC PI DENTON PA UNIV N TEXAS DENTON, 1155 UNION CIRCLE 311580, DENTON, TX 76203-5017 USA SN 0038-478X J9 SOUTHWEST HIST QUART JI Southw. Hist. Q. PD OCT PY 1993 VL 97 IS 2 BP 400 EP 401 PG 2 WC History SC History GA ME604 UT WOS:A1993ME60400032 ER PT J AU LOWREY, AH KALASINSKY, V WILLIAMS, RW AF LOWREY, AH KALASINSKY, V WILLIAMS, RW TI SCALED QUANTUM-MECHANICAL FORCE-FIELD FOR GLYCINE IN BASIC SOLUTION SO STRUCTURAL CHEMISTRY LA English DT Article DE HYDRATION; SCALE FACTORS; AB-INITIO; FORCE CONSTANTS; GLYCINE ID ALA-X PEPTIDES; FREQUENCIES AB We obtain scale factors for three glycinate-nH2O ab initio force fields, using the 4-31G basis set, that can be used in building a scaled quantum mechanical force field for alanine and, subsequently, for peptides in aqueous solutions. Force constants from the fully optimized glycinate-nH2O supermolecules were scaled by using experimentally determined vibrational frequencies of glycine in water at pH 13. Similar calculations were performed for methylamine and acetate. Scale factors for the stretching modes of acetate are within 2% of the related scale factors for glycinate. The scale factor for the NH2 scissor mode in methylamine is also in agreement with that of glycinate. Changes in the scale factors as a function of the number of hydrating water molecules were also similar between glycinate and acetate. Amine groups showed relatively small changes. Scale factors for glycinate with no hydrating molecules were extrapolated from the supermolecule results, since the optimized structure of isolated glycinate obtained with the 4-31G basis set yielded one imaginary frequency. Good agreements between calculated and experimental frequencies for glycinate, acetate, and methyl amine were obtained for each set of scale factors. Scaling appears to compensate for the systematic effects of hydration on force constants, making it possible to obtain reliable frequency predictions for amino acids in water without resorting to expensive supermolecule calculations. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT BIOCHEM,4301 JONES BRIDGE RD,BETHESDA,MD 20814. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. ARMED FORCES INST PATHOL,DEPT ENVIRONM & TOXICOL PATHOL,WASHINGTON,DC 20306. NR 12 TC 15 Z9 15 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 1040-0400 J9 STRUCT CHEM JI Struct. Chem. PD OCT PY 1993 VL 4 IS 5 BP 289 EP 298 DI 10.1007/BF00681202 PG 10 WC Chemistry, Multidisciplinary; Chemistry, Physical; Crystallography SC Chemistry; Crystallography GA MC574 UT WOS:A1993MC57400001 ER PT J AU LATENDRESSE, JR AZHAR, S BROOKS, CL CAPEN, CC AF LATENDRESSE, JR AZHAR, S BROOKS, CL CAPEN, CC TI PATHOGENESIS OF CHOLESTERYL LIPIDOSIS OF ADRENOCORTICAL AND OVARIAN INTERSTITIAL-CELLS IN F344 RATS CAUSED BY TRICRESYL PHOSPHATE AND BUTYLATED TRIPHENYL PHOSPHATE SO TOXICOLOGY AND APPLIED PHARMACOLOGY LA English DT Article ID ORTHO-CRESYL PHOSPHATE; ADRENAL-GLAND; METABOLISM C1 VET AFFAIRS MED CTR,GRECC,PALO ALTO,CA 94304. OHIO STATE UNIV,DEPT VET PATHOBIOL,COLUMBUS,OH 43210. RP LATENDRESSE, JR (reprint author), USN,MED RES INST,TOXICOL DETACHMENT,DIV TOX HAZARDS,BLDG 79,2856 G ST,AREA B,WRIGHT PATTERSON AFB,OH 45433, USA. RI Latendresse, John/A-9215-2009 NR 27 TC 20 Z9 21 U1 4 U2 7 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0041-008X J9 TOXICOL APPL PHARM JI Toxicol. Appl. Pharmacol. PD OCT PY 1993 VL 122 IS 2 BP 281 EP 289 DI 10.1006/taap.1993.1197 PG 9 WC Pharmacology & Pharmacy; Toxicology SC Pharmacology & Pharmacy; Toxicology GA MB632 UT WOS:A1993MB63200014 PM 8212010 ER PT J AU HUNT, BR KAN, I YORKE, JA AF HUNT, BR KAN, I YORKE, JA TI WHEN CANTOR SETS INTERSECT THICKLY SO TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY LA English DT Article AB The thickness of a Cantor set on the real line is a measurement of its ''size''. Thickness conditions have been used to guarantee that the intersection of two Cantor sets is nonempty. We present sharp conditions on the thicknesses of two Cantor sets which imply that their intersection contains a Cantor set of positive thickness. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. GEORGE MASON UNIV,DEPT MATH SCI,FAIRFAX,VA 22030. UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLL PK,MD 20742. RI Hunt, Brian/J-6895-2012 NR 10 TC 5 Z9 5 U1 0 U2 2 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0002-9947 J9 T AM MATH SOC JI Trans. Am. Math. Soc. PD OCT PY 1993 VL 339 IS 2 BP 869 EP 888 DI 10.2307/2154303 PG 20 WC Mathematics SC Mathematics GA MB254 UT WOS:A1993MB25400023 ER PT J AU ROLLWAGEN, FM PACHECO, ND CLEMENTS, JD PAVLOVSKIS, O ROLLINS, DM WALKER, RI AF ROLLWAGEN, FM PACHECO, ND CLEMENTS, JD PAVLOVSKIS, O ROLLINS, DM WALKER, RI TI KILLED CAMPYLOBACTER ELICITS IMMUNE-RESPONSE AND PROTECTION WHEN ADMINISTERED WITH AN ORAL ADJUVANT SO VACCINE LA English DT Article DE ENTEROTOXIGENIC ESCHERICHIA-COLI; HEAT-LABILE TOXIN; ADJUVANT; CAMPYLOBACTER ID TOXIGENIC ESCHERICHIA-COLI; LABILE ENTERO-TOXIN; CHOLERA-TOXIN; B-SUBUNIT; JEJUNI; ANTIGENS; VACCINE; ANTIBODY; MUCOSAL; RABBITS AB The heat-labile toxin (HLT) of enterotoxigenic Escherichia coli (ETEC) is a potent oral adjuvant. We determined whether the ETEC HLT could be mixed with killed campylobacter to induce an immune response protective upon subsequent challenge with live pathogens. Mice were immunized orally three times with 10(9) sonicated campylobacter with or without 25 mug of ETEC HLT, and humoral immune responses in intestinal lavage fluids measured by, ELISA. Whereas 10(9) live bacteria induced strong intestinal IgA responses, killed bacteria did not unless ETEC HLT was also added. The magnitude of the antibody, response was dependent on the amount of antigen given. The ETEC HLT given with bacteria also induced a potent cross-reaction with cholera toxin. The latter had an adjuvant effect in mice similar to that of ETEC HLT. Protection against colonization was studied in mice and rabbits. In contrast to non-immune animals, those given live organisms or sonicated cells mixed with ETEC HLT quickly cleared homologous, but not heterologous, Lior serotypes of Campylobacter upon challenge. These data show for the first time that ETEC HLT can potentiate an immune response to killed campylobacter that promotes a rapid clearance of live pathogens from the intestine. C1 TULANE UNIV, SCH MED, DEPT MICROBIOL & IMMUNOL, NEW ORLEANS, LA 70112 USA. RP USN, MED RES INST, ENTER DIS PROGRAM, BETHESDA, MD 20889 USA. NR 24 TC 55 Z9 59 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0264-410X EI 1873-2518 J9 VACCINE JI Vaccine PD OCT PY 1993 VL 11 IS 13 BP 1316 EP 1320 DI 10.1016/0264-410X(93)90101-3 PG 5 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA MC984 UT WOS:A1993MC98400008 PM 8296484 ER PT J AU KRISTEVAFEIGE, R FEIGE, B MAKEIG, S ROSS, B ELBERT, T AF KRISTEVAFEIGE, R FEIGE, B MAKEIG, S ROSS, B ELBERT, T TI OSCILLATORY BRAIN ACTIVITY DURING A MOTOR TASK SO NEUROREPORT LA English DT Article DE MAGNETOENCEPHALOGRAPHY (MEG); OSCILLATORY ACTIVITY; SENSORIMOTOR INTEGRATION; GAMMA BAND; MOTOR CORTEX; RHYTHMIC; EEG ID VISUAL-CORTEX; CAT AB CHANGES in spectral power in neuromagnetic fields associated with a manual task requiring a high level of sensorimotor integration (SMI) were investigated by analysing spontaneous, non-invasively recorded activity during motor preparation (WAIT), task performance (SMI), and control (REST) conditions in four healthy, right-handed human subjects. Neuromagnetic fields were recorded over the left sensorimotor cortex using a 37-channel instrument. In all subjects, a prominent narrow-band motor preparation rhythm centred near 19 Hz was consistently observed during the WAIT state. During SMI, mean relative increases in 26-30 Hz activity appeared in two of the subjects, paralleling gamma band enhancement recently observed during SMI in monkeys. C1 USN,NAVAL HLTH RES CTR,SAN DIEGO,CA 92186. RP KRISTEVAFEIGE, R (reprint author), INST EXPTL AUDIOL,KARDINAL VON GALEN RING 10,D-48129 MUNSTER,GERMANY. RI Elbert, Thomas/C-8556-2009; Feige, Bernd/C-6690-2012 OI Feige, Bernd/0000-0002-9436-1258 NR 11 TC 76 Z9 76 U1 0 U2 2 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0959-4965 J9 NEUROREPORT JI Neuroreport PD SEP 30 PY 1993 VL 4 IS 12 BP 1291 EP 1294 DI 10.1097/00001756-199309150-00001 PG 4 WC Neurosciences SC Neurosciences & Neurology GA MA668 UT WOS:A1993MA66800001 PM 8260607 ER PT J AU MCCLEAN, RE NELSON, HH CAMPBELL, ML AF MCCLEAN, RE NELSON, HH CAMPBELL, ML TI KINETICS OF THE REACTION AL(P-2(0))+H2O OVER AN EXTENDED TEMPERATURE-RANGE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRONIC-STRUCTURE; DEPENDENCE; PRESSURE AB The temperature dependence of the reaction Al(P-2(0)) + H2O has been investigated over the temperature range 298-1174 K. Aluminum atoms were produced by photodissociation of Al(C2H5)3 and were detected by laser-induced fluorescence. Nonlinear Arrhenius behavior is observed, and the measured rate constants can be described by the expression k(T) = (1.9 +/- 1.5) X 10(-12) exp[-(0.88 +/- 0.44 kcal mol-1)/RT] + (1.6 +/- 0.7) X 10(-10) exp[-(5.7 +/- 0.9 kcal mol-1)/RT] cm3 s-1, where the uncertainties represent +/-2sigma. At room temperature the rate constant is pressure independent between 10 and 110 Torr total pressure (Ar buffer gas). Results are interpreted in terms of two metathesis reactions with different Arrhenius parameters, one yielding AlO and the other AlOH. C1 USN,RES LAB,DIV CHEM,CODE 6111,WASHINGTON,DC 20375. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 23 TC 34 Z9 37 U1 0 U2 1 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 SEP 23 PY 1993 VL 97 IS 38 BP 9673 EP 9676 DI 10.1021/j100140a024 PG 4 WC Chemistry, Physical SC Chemistry GA LY495 UT WOS:A1993LY49500024 ER PT J AU GRATE, JW MCGILL, RA HILVERT, D AF GRATE, JW MCGILL, RA HILVERT, D TI ANALYSIS OF SOLVENT EFFECTS ON THE DECARBOXYLATION OF BENZISOXAZOLE-3-CARBOXYLATE IONS USING LINEAR SOLVATION ENERGY RELATIONSHIPS - RELEVANCE TO CATALYSIS IN AN ANTIBODY-BINDING SITE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID SOLVATOCHROMIC COMPARISON METHOD; PHYSICAL ORGANIC-CHEMISTRY; PI-STAR; 6-NITROBENZISOXAZOLE-3-CARBOXYLATE ANION; ALPHA-SCALE; HYDROGEN; SOLUBILITY; ACIDS; BENZISOXAZOLES; BASICITIES AB The mechanisms by which specific solvent properties influence the title reaction, which is extremely medium-sensitive, have been investigated using multiparametric methods. The results of this analysis have been compared with previous experimental studies of the reaction mechanism. Hydrogen-bond donation by solvent and hydrogen-bond donation by tetramethylguanidinium ion in tight ion pairs with the carboxylate greatly retard the reaction. Solvent dipolarity and basicity accelerate the reaction, most likely by helping to break up hydrogen-bonded ion pairs. The rate of decarboxylation in the binding pocket of a catalytic antibody developed for this reaction is slower than that expected of a free carboxylate in an aprotic environment. Therefore, the binding site may contain a hydrogen-bond-donating species. A better catalyst might be developed by approaches that reduce hydrogen bonding in the active site without reducing substrate binding. C1 USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. GEOCENTERS INC, FT WASHINGTON, MD 20744 USA. Scripps Res Inst, DEPT CHEM, LA JOLLA, CA 92037 USA. SCRIPPS RES INST, DEPT MOLEC BIOL, LA JOLLA, CA 92037 USA. NR 52 TC 44 Z9 44 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 22 PY 1993 VL 115 IS 19 BP 8577 EP 8584 DI 10.1021/ja00072a009 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA LZ133 UT WOS:A1993LZ13300009 ER PT J AU ESQUIRE, RG PEDERSON, ED COVILL, PJ SMITH, PF AF ESQUIRE, RG PEDERSON, ED COVILL, PJ SMITH, PF TI RELATIONSHIP OF PAROTID-SALIVA C-REACTIVE PROTEIN TO CATECHOLAMINE RELEASE SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article C1 USN,SUBMARINE MED RES LAB,NEW LONDON,CT 06349. RP ESQUIRE, RG (reprint author), USN,DENT RES INST,GREAT LAKES,IL 60088, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD SEP 20 PY 1993 VL 694 BP 276 EP 279 DI 10.1111/j.1749-6632.1993.tb18363.x PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MA264 UT WOS:A1993MA26400028 PM 8215065 ER PT J AU MEDNIEKS, MI ZAKI, AE EPSTEIN, PM HACHISU, R HAND, AR BODNER, J ESQUIRE, RG AF MEDNIEKS, MI ZAKI, AE EPSTEIN, PM HACHISU, R HAND, AR BODNER, J ESQUIRE, RG TI PLEOMORPHY OF INDIVIDUAL PROTEIN-PATTERNS AND CYCLIC-AMP REACTIONS IN HUMAN SALIVA SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID PAROTID-GLAND; KINASE; SUBUNITS; RAT C1 UNIV CONNECTICUT,CTR HLTH,DEPT PEDIAT DENT & ORTHODONT,FARMINGTON,CT 06030. USN,MED RES LAB,NEW LONDON,CT 06349. USN,DENT RES INST,GREAT LAKES,IL 60088. UNIV CONNECTICUT,CTR HLTH,DEPT PHARMACOL,FARMINGTON,CT 06030. RP MEDNIEKS, MI (reprint author), UNIV ILLINOIS,COLL DENT,DEPT ORAL BIOL,CHICAGO,IL 60637, USA. FU NIDCR NIH HHS [DE08034] NR 6 TC 2 Z9 2 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD SEP 20 PY 1993 VL 694 BP 299 EP 301 DI 10.1111/j.1749-6632.1993.tb18370.x PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MA264 UT WOS:A1993MA26400035 PM 8215072 ER PT J AU BHAT, GS PEEBLES, LH ABHIRAMAN, AS COOK, FL AF BHAT, GS PEEBLES, LH ABHIRAMAN, AS COOK, FL TI RAPID STABILIZATION OF ACRYLIC FIBERS USING AMMONIA - EFFECT ON STRUCTURE AND MORPHOLOGY SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID CARBON-FIBERS; POLYACRYLONITRILE; POLYMERS AB Acrylic fibers were stabilized, for subsequent carbonization, in oxidizing, inert, ammonia and mixed environments and the stabilized fibers were characterized using several techniques to determine the extent of reactions as well as the morphological changes. Ammonia was shown to accelerate stabilization of acrylic precursors that did not contain other effective initiators, such as acid comonomers. Two effects of ammonia-nucleophilic attack in initiating polymerization of nitrile groups and, possibly, the rapid disruption of lateral order in precursor morphology-combine to produce a significant enhancement in the rate of this intermediate step in the formation of carbon fibers. (C) 1993 John Wiley & Sons, Inc. C1 USN,RES LABS,WASHINGTON,DC 20375. GEORGIA INST TECHNOL,CTR POLYMER EDUC & RES,ATLANTA,GA 30332. RP BHAT, GS (reprint author), UNIV TENNESSEE,CTR MAT PROC,KNOXVILLE,TN 37996, USA. NR 11 TC 12 Z9 12 U1 0 U2 4 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 SEP 20 PY 1993 VL 49 IS 12 BP 2207 EP 2219 DI 10.1002/app.1993.070491217 PG 13 WC Polymer Science SC Polymer Science GA LU073 UT WOS:A1993LU07300017 ER PT J AU ALTMAN, EI COLTON, RJ AF ALTMAN, EI COLTON, RJ TI THE INTERACTION OF C-60 WITH NOBLE-METAL SURFACES SO SURFACE SCIENCE LA English DT Article ID SCANNING TUNNELING MICROSCOPY; GOLD SURFACES; ELECTRONIC-STRUCTURE; RAMAN-SPECTROSCOPY; EPITAXIAL-GROWTH; ORGANIC-SURFACES; SOLID C60; AU(111); CARBON; ADSORPTION AB The interaction of C60 with Ag(111) was studied using UHV-STM, LEED, AES, and TOF-SIMS and compared with previous results for Au(111). On both surfaces, C60 grows in a layer-by-layer manner with nucleation occurring at steps separating narrow terraces followed by growth from the steps onto larger terraces. However, differences in C60 growth on the two surfaces due to the Au(111) surface reconstruction were observed. Also, on Ag(111), C60 was found to form a 2 square-root 3 X 2 square-root 3 R30-degrees structure while on Au(111) a 38 X 38 in-phase structure was also observed indicating a stronger driving force for adsorption into specific sites on Ag(111). Adsorbed C60 molecules were found to rotate faster on Au(111) than on Ag(111) also indicating a stronger interaction between C60 and Ag. Annealing studies, however, showed that C60 desorbs from both Au(111) and Ag(111) at approximately 500-degrees-C indicating that differences in interaction strength between the two surfaces cannot be large. The mobility of first and second layer molecules was also studied using STM. The results indicated that individual adsorbed molecules are sufficiently mobile for thermodynamic considerations to be important in determining nucleation and growth on both surfaces. It was also found that small second layer islands rearrange over the time-scale of minutes, but that concerted motion and rearrangement of large first layer domains is not likely at room temperature on both surfaces. RP ALTMAN, EI (reprint author), USN,RES LAB,DIV CHEM,CODE 6177,WASHINGTON,DC 20375, USA. NR 59 TC 171 Z9 171 U1 6 U2 54 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD SEP 20 PY 1993 VL 295 IS 1-2 BP 13 EP 33 DI 10.1016/0039-6028(93)90181-I PG 21 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LX840 UT WOS:A1993LX84000011 ER PT J AU CONWELL, JA COCALIS, MW ERICKSON, LC AF CONWELL, JA COCALIS, MW ERICKSON, LC TI EAT TO THE BEAT - ECTOPIC ATRIAL TACHYCARDIA CAUSED BY CATHETER WHIP SO LANCET LA English DT Letter C1 USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP CONWELL, JA (reprint author), USN,MED CTR,DEPT PEDIAT,SAN DIEGO,CA 92134, USA. NR 4 TC 11 Z9 11 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 SEP 18 PY 1993 VL 342 IS 8873 BP 740 EP 740 DI 10.1016/0140-6736(93)91732-2 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA LX469 UT WOS:A1993LX46900034 PM 8103838 ER PT J AU FREITAS, JA KLEIN, PB COLLINS, AT AF FREITAS, JA KLEIN, PB COLLINS, AT TI OBSERVATION OF NEW VIBRONIC LUMINESCENCE BAND IN SEMICONDUCTING DIAMOND SO ELECTRONICS LETTERS LA English DT Article DE PHOTOLUMINESCENCE; SEMICONDUCTOR MATERIALS AB Steady state and time-resolved photoluminescence studies have been carried out for a new vibronic emission band, with a zero phonon line at 2.395eV, that is observed in type IIb semiconducting diamond. This band exhibits a relatively slow (228ns) photoluminescence decay that is exponential, and is believed to be due to an internal transition at a defect site. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV LONDON KINGS COLL,DEPT PHYS,LONDON WC2R 2LS,ENGLAND. RP FREITAS, JA (reprint author), SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785, USA. NR 6 TC 0 Z9 0 U1 1 U2 1 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 SEP 17 PY 1993 VL 29 IS 19 BP 1727 EP 1728 DI 10.1049/el:19931148 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA MG598 UT WOS:A1993MG59800037 ER PT J AU WASHBURN, L SWENSON, MS LARGIER, JL KOSRO, PM RAMP, SR AF WASHBURN, L SWENSON, MS LARGIER, JL KOSRO, PM RAMP, SR TI CROSS-SHELF SEDIMENT TRANSPORT BY AN ANTICYCLONIC EDDY OFF NORTHERN CALIFORNIA SO SCIENCE LA English DT Article ID COASTAL TRANSITION ZONE; POINT ARENA; OCEAN; FILAMENT; SYSTEM; JUNE AB A combination of satellite imagery, shipboard profiles, drifter tracks, and moored current observations reveals that an anticyclonic eddy off the coast of northern California transported plumes of suspended sediments from the continental shelf into the deep ocean. The horizontal scale of the eddy was about 90 kilometers, and the eddy remained over the continental shelf and slope for about 2 months during the summer of 1988. The total mass of sediments transported by the eddy was of order 10(5) metric tons. Mesoscale eddies are recurrent features in this region and occur frequently in eastern boundary currents. These results provide direct evidence that eddies export sediments from continental shelves. C1 NOAA,ATLANTIC OCEANOG & METEOROL LAB,MIAMI,FL 33149. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. OREGON STATE UNIV,COLL OCEANOG,CORVALLIS,OR 97331. RP WASHBURN, L (reprint author), UNIV CALIF SANTA BARBARA,DEPT GEOG,CTR REMOTE SENSING & ENVIRONM OPT,SANTA BARBARA,CA 93106, USA. NR 18 TC 47 Z9 47 U1 1 U2 7 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 17 PY 1993 VL 261 IS 5128 BP 1560 EP 1564 DI 10.1126/science.261.5128.1560 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LX474 UT WOS:A1993LX47400024 PM 17798114 ER PT J AU DELAGRANGE, AD AF DELAGRANGE, AD TI FEEDBACK-FREE AMP MAKES STABLE DIFFERENTIATOR SO EDN LA English DT Note RP DELAGRANGE, AD (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CAHNERS-DENVER PUBLISHING CO PI HIGHLANDS RANCH PA 8773 S RIDGELINE BLVD, HIGHLANDS RANCH, CO 80126-2329 SN 0012-7515 J9 EDN JI EDN PD SEP 16 PY 1993 VL 38 IS 19 BP 124 EP 124 PG 1 WC Engineering, Electrical & Electronic SC Engineering GA LY136 UT WOS:A1993LY13600016 ER PT J AU LAN, MS RUSSELL, EK LU, J JOHNSON, BE NOTKINS, AL AF LAN, MS RUSSELL, EK LU, J JOHNSON, BE NOTKINS, AL TI IA-1, A NEW MARKER FOR NEUROENDOCRINE DIFFERENTIATION IN HUMAN LUNG-CANCER CELL-LINES SO CANCER RESEARCH LA English DT Note ID L-DOPA DECARBOXYLASE; CHROMOGRANIN-A; CYTOGENETIC ABNORMALITIES; SUPPLEMENTED MEDIUM; CARCINOMA; GROWTH; ESTABLISHMENT; ENDOCRINE; TUMORS AB IA-1 is a recently isolated novel complementary DNA which encodes a protein of 510 amino acids that contains both a zinc ringer DNA-binding domain and a putative prohormone domain. mRNA expression of IA-1 has been found thus far only in tumors of neuroendocrine origin. In this report we describe the expression of IA-1 mRNA in a panel of 64 human lung cancer cell lines. IA-1 mRNA was detected by Northern blot analysis in 97% (30 of 31) of small cell lung cancer cell lines. In contrast, IA-1 mRNA was detected in only 13% (4 of 30) of non-small cell lung cancer cell lines. Nine of the 30 (30%) expressed either chromogranin A mRNA or produced L-dopa decarboxylase. Four of these 9 (44%) had detectable levels of IA-1 mRNA. In most of the lung cancer cell lines examined, IA-1 showed high concordance with the other neuroendocrine markers, L-dopa decarboxylase, and chromogranin A. The one exception was a variant small cell lung cancer cell line which expressed low or nondetectable levels of L-dopa decarboxylase. IA-1 is a candidate marker of neuroendocrine differentiation of human lung tumors. C1 USN,NATL MED CTR,NCI,NAVY ONCOL BRANCH,BETHESDA,MD 20889. RP LAN, MS (reprint author), NIDR,ORAL MED LAB,BLDG 30,ROOM 121,BETHESDA,MD 20892, USA. NR 24 TC 47 Z9 47 U1 0 U2 2 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD SEP 15 PY 1993 VL 53 IS 18 BP 4169 EP 4171 PG 3 WC Oncology SC Oncology GA LW553 UT WOS:A1993LW55300010 PM 8364910 ER PT J AU LITTLE, SA CARTER, PH SMITH, DK AF LITTLE, SA CARTER, PH SMITH, DK TI WAVELET ANALYSIS OF A BATHYMETRIC PROFILE REVEALS ANOMALOUS CRUST SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID DECOMPOSITION AB A 200 km anomalous topographic zone was discovered using wavelet scale analysis in a 1600 km linear bathymetric profile taken northeast of Hawaii. A spectral analysis of the zone shows that the power in wavelengths shorter than 25 km averages 5-10 times lower than the surrounding topography. Conversely, wavelengths longer than 25 km have 2-3 times greater power than nearby topography. Further research reveals that this low-frequency zone correlates with the eastern flank of a regional bathymetric high which has been described by J. Mammerickx [1981]. Details of the features suggest that this zone is a small, abandoned, slow-spreading rift overprinted by a regional thermal swell. The magnitude of the feature is smaller than other, known, abandoned spreading centers, making it easy to overlook without the application of the wavelet transform. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP LITTLE, SA (reprint author), WOODS HOLE OCEANOG INST,REDFIELD 114,WOODS HOLE,MA 02543, USA. RI Wright, Dawn/A-4518-2011 OI Wright, Dawn/0000-0002-2997-7611 NR 8 TC 16 Z9 16 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 15 PY 1993 VL 20 IS 18 BP 1915 EP 1918 DI 10.1029/93GL01880 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LX651 UT WOS:A1993LX65100007 ER PT J AU RUSSELL, AE WILLIAMS, GP LIN, AS OGRADY, WE AF RUSSELL, AE WILLIAMS, GP LIN, AS OGRADY, WE TI FAR-INFRARED SYNCHROTRON-RADIATION FOR IN-SITU STUDIES OF THE ELECTROCHEMICAL INTERFACE SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Note ID ENHANCED RAMAN-SPECTROSCOPY; VIBRATIONAL FREQUENCIES; ELECTRODES; SILVER; IONS; ADSORPTION; REDUCTION; SURFACES; PYRIDINE; LAYER C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. GEORGE WASHINGTON UNIV,DEPT CHEM,WASHINGTON,DC 20052. USN,RES LAB,WASHINGTON,DC 20375. RP RUSSELL, AE (reprint author), UNIV LIVERPOOL,DEPT CHEM,POB 174,LIVERPOOL L69 3BX,ENGLAND. RI Russell, Andrea/B-8114-2009; Russell, Andrea/A-9625-2012 NR 24 TC 6 Z9 6 U1 0 U2 2 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 SEP 15 PY 1993 VL 356 IS 1-2 BP 309 EP 315 DI 10.1016/0022-0728(93)80531-L PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA LW120 UT WOS:A1993LW12000026 ER PT J AU HALLOCK, ZR TEAGUE, WJ AF HALLOCK, ZR TEAGUE, WJ TI SEA-SURFACE HEIGHT FLUCTUATIONS OBSERVED SIMULTANEOUSLY WITH INVERTED ECHO SOUNDERS AND GEOSAT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID NEW-ENGLAND SEAMOUNTS; GULF-STREAM MEANDERS; ALTIMETER DATA; GRAND-BANKS; VARIABILITY; TOPOGRAPHY; ATLANTIC; PROFILES; LEVEL AB Time series of sea surface height anomaly as measured by inverted echo sounders with pressure gauges (IES/PGs) and Geosat altimetry are compared at six locations in the northwest Atlantic near 40-degrees-N, 55-degrees-W. Three IES/PG sites lay along each of two adjacent Geosat-Exact Repeat Mission ground tracks. Better agreement was found along the westernmost ground track; pressure sensor noise is the probable source of the larger errors along the easternmost ground track. The overall correlation is 0.78; along the westernmost ground track it is 0.91. Decorrelation scales are about 100 km along track and about 5 days. Uncorrelated errors dominate, but along the westernmost ground track, IES/PG-derived sea surface height variability is systematically smaller than that derived from Geosat data; this factor, determined by regression analysis, is about 0.81. However, a consistent adjustment of IES calibration removes the systematic discrepancy. RP HALLOCK, ZR (reprint author), NAVAL RES LAB,BAY ST LOUIS,MS 39529, USA. NR 27 TC 6 Z9 6 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD SEP 15 PY 1993 VL 98 IS C9 BP 16341 EP 16349 DI 10.1029/93JC01220 PG 9 WC Oceanography SC Oceanography GA LX764 UT WOS:A1993LX76400004 ER PT J AU CORNUELLE, BD WORCESTER, PF HILDEBRAND, JA HODGKISS, WS DUDA, TF BOYD, J HOWE, BM MERCER, JA SPINDEL, RC AF CORNUELLE, BD WORCESTER, PF HILDEBRAND, JA HODGKISS, WS DUDA, TF BOYD, J HOWE, BM MERCER, JA SPINDEL, RC TI OCEAN ACOUSTIC TOMOGRAPHY AT 1000-KM RANGE USING WAVE-FRONTS MEASURED WITH A LARGE-APERTURE VERTICAL ARRAY SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID TRAVEL-TIME; PACIFIC-OCEAN; MESOSCALE; PROPAGATION; BIASES; SOUND AB Broadband acoustic signals transmitted from a moored 250-Hz source to a 3-km-long vertical line array of hydrophones 1000 km distant in the north central Pacific Ocean were used to determine the amount of information available from tomographic techniques used in the vertical plane connecting a source-receiver pair. A range-independent, pure acoustic inverse to obtain the sound speed field using travel time data from the array is shown to be possible by iterating from climatological data without using any information from concurrent environmental measurements. Range-dependent inversions indicate resolution of components of oceanic variability with horizontal wavelengths shorter than 50 km, although the limited spatial resolution of concurrent direct measurements does not provide a strong cross-validation, since the typical cast spacing of 20-25 km gives a Nyquist wavelength of 40-50 km. The small travel time signals associated with high-wavenumber ocean variability place stringent but achievable requirements on travel time measurement precision. The forward problem for the high-wavenumber components of the model is found to be subject to relatively large linearization errors, however, unless the sound speed field at wavelengths greater than about 50 km is known from other measurements or from a two-dimensional tomographic array. The high-ocean-wavenumber resolution that is in principle available from tomographic measurements is therefore achievable only under restricted conditions. C1 NAVAL RES LAB,BAY ST LOUIS,MS 39529. UNIV WASHINGTON,APPL PHYS LAB,SEATTLE,WA 98105. WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. RP CORNUELLE, BD (reprint author), UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,MARINE PHYS LAB,MAIL STOP 0230,9500 GILMAN DR,LA JOLLA,CA 92093, USA. RI Duda, Timothy/A-7282-2010; OI Duda, Timothy/0000-0002-5797-5955; Howe, Bruce/0000-0001-5711-5253 NR 26 TC 20 Z9 20 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD SEP 15 PY 1993 VL 98 IS C9 BP 16365 EP 16377 DI 10.1029/93JC01246 PG 13 WC Oceanography SC Oceanography GA LX764 UT WOS:A1993LX76400006 ER PT J AU THORNTON, EB KIM, CS AF THORNTON, EB KIM, CS TI LONGSHORE-CURRENT AND WAVE HEIGHT MODULATION AT TIDAL FREQUENCY INSIDE THE SURF ZONE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SHEAR INSTABILITIES; BEACH AB Data were acquired continuously during the 19-day DELILAH nearshore experiment with a specific objective of examining variability of the longshore current at tidal frequencies. It is hypothesized that breaking wave heights inside the surf zone are strong functions of the depth which are modulated by the tidal variations, and since radiation stress is a function of the wave height, longshore currents are forced at the tidal frequency inside the surf zone. The measured longshore current variations at tidal frequency are the same order of magnitude as the mean longshore current variations for moderate wave height conditions, indicating that the tide is a dominant mechanism associated with longshore current variability. Simulations of the magnitude and phase of the longshore current variability with tide elevation using the model by Thornton and Guza (1986) are used to explain observations. The measured tidal elevation and longshore current are in phase in the inner surf zone and out of phase in the outer surf zone as predicted by the model, verifying the hypothesis. C1 KOREA OCEAN R&D INST, SEOUL, SOUTH KOREA. RP NAVAL POSTGRAD SCH, DEPT OCEANOG, CODE OC TM, MONTEREY, CA 93943 USA. NR 11 TC 45 Z9 45 U1 2 U2 3 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 SEP 15 PY 1993 VL 98 IS C9 BP 16509 EP 16519 DI 10.1029/93JC01440 PG 11 WC Oceanography SC Oceanography GA LX764 UT WOS:A1993LX76400017 ER PT J AU ROSENBLATT, GH QUARLES, GJ ESTEROWITZ, L RANDLES, M CREAMER, J BELT, R AF ROSENBLATT, GH QUARLES, GJ ESTEROWITZ, L RANDLES, M CREAMER, J BELT, R TI CONTINUOUS-WAVE 1.94-MU-M TMCAY4(SIO4)3O LASER SO OPTICS LETTERS LA English DT Article ID EFFICIENT AB Continuous-wave laser emission at 1.94 mum is reported in Tm:CaY4(SiO4)3O at room temperature with Ti:sapphire laser pumping at 790 nm. Pump thresholds of 100 mW and slope efficiencies of 32% have been achieved. The H-3(6)-H-3(4) pump absorption peak of 6% Tm:CaY4(SiO4)3O is six times stronger than the H-3(6)-H-3(4) pump absorption peak of 6% Tm:YAG. C1 LIGHTNING OPT CORP,TARPON SPRINGS,FL 34689. USN,RES LAB,WASHINGTON,DC 20375. LITTON AIRTRON SYNOPT,CHARLOTTE,NC 28241. LITTON AIRTRON,MORRIS PLAINS,NJ 07950. RP ROSENBLATT, GH (reprint author), SFA INC,LANDOVER,MD 20875, USA. NR 7 TC 3 Z9 3 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 SEP 15 PY 1993 VL 18 IS 18 BP 1523 EP 1525 DI 10.1364/OL.18.001523 PG 3 WC Optics SC Optics GA LW885 UT WOS:A1993LW88500015 PM 19823433 ER PT J AU MARRONE, MJ ESMAN, RD KERSEY, AD AF MARRONE, MJ ESMAN, RD KERSEY, AD TI FIBEROPTIC MAGNETIC-FIELD SENSOR WITH AN ORTHOCONJUGATING LOOP MIRROR SO OPTICS LETTERS LA English DT Article ID POLARIZATION AB A hybrid fiber- and bulk-optic Faraday-rotation-based electric current and magnetic field sensor is described. The scheme employs a new orthoconjugating fiber loop mirror to permit interrogation of a remotely located sensor over a conventional single-mode fiber link independent of birefringence perturbations in the link. A Bi-substituted YIG film sensing element gives a sensitivity of 0.45 deg/G over a range of 1 mG to 100 G. RP MARRONE, MJ (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5670,WASHINGTON,DC 20375, USA. NR 9 TC 7 Z9 7 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 15 PY 1993 VL 18 IS 18 BP 1556 EP 1558 DI 10.1364/OL.18.001556 PG 3 WC Optics SC Optics GA LW885 UT WOS:A1993LW88500026 PM 19823444 ER PT J AU FATEMI, M TADAYON, B TWIGG, ME DIETRICH, HB AF FATEMI, M TADAYON, B TWIGG, ME DIETRICH, HB TI HIGH-RESOLUTION X-RAY-ANALYSIS OF STRAIN IN LOW-TEMPERATURE GAAS SO PHYSICAL REVIEW B LA English DT Article ID THIN SEMICONDUCTOR LAYERS; MOLECULAR-BEAM EPITAXY AB X-ray-diffraction measurements have been used to characterize GaAs layers grown at low temperature on GaAs substrates by molecular-beam epitaxy. Three ranges of low-temperature growth are defined, labeled as ''low range,'' (less than 260-degrees-C), ''midrange,'' (between 260 and 450-degrees-C), and ''high range,'' (above 450-degrees-C), as measured by a growth-chamber thermocouple. Films grown in the low range are amorphous, those in the midrange are fully strained and lattice matched to the substrate, and those grown above 450-degrees-C are similar to ordinary GaAs. A notable property of the midrange layers is the expansion and contraction of the lattice parameter with thermal anneals up to 900-degrees-C. From x-ray rocking-curve measurements on more than 200 anneal conditions in this group, a growth model based on arsenic antisite defects is proposed. RP FATEMI, M (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 13 TC 16 Z9 16 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 SEP 15 PY 1993 VL 48 IS 12 BP 8911 EP 8917 DI 10.1103/PhysRevB.48.8911 PG 7 WC Physics, Condensed Matter SC Physics GA LY959 UT WOS:A1993LY95900046 ER PT J AU UNRUH, KM HUBER, TE HUBER, CA AF UNRUH, KM HUBER, TE HUBER, CA TI MELTING AND FREEZING BEHAVIOR OF INDIUM METAL IN POROUS GLASSES SO PHYSICAL REVIEW B LA English DT Article ID VYCOR GLASS; SIZE DEPENDENCE; SMALL PARTICLES; GOLD PARTICLES; HEAT-CAPACITY; TEMPERATURE; LEAD; HYDROGEN; POINT; FILMS AB The size-dependent melting and freezing behavior of In metal in porous silica glasses with mean pore diameters between 6 and 141 nm has been studied by differential scanning calorimetry. The melting and freezing temperatures of the pore In were always less than the corresponding bulk values, and varied in inverse proportion to the diameter of the confining silica pores. In the smallest pores the latent heat of fusion was also determined, and found to be about one-third of its bulk value. The observed size dependence of the melting temperature was in good agreement with the predictions of thermodynamic treatments of melting in finite systems, and allowed the solid-liquid interfacial free energy to be estimated for several different geometrical models. The measured latent heat, however, was smaller than expected based on thermodynamic considerations. No evidence for an energy barrier separating the solid from the liquid was found. C1 HOWARD UNIV, WASHINGTON, DC 20059 USA. POLYTECH INST NEW YORK, DEPT PHYS, BROOKLYN, NY 11201 USA. USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. RP UNIV DELAWARE, DEPT PHYS & ASTRON, NEWARK, DE 19716 USA. NR 62 TC 181 Z9 182 U1 1 U2 17 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 SEP 15 PY 1993 VL 48 IS 12 BP 9021 EP 9027 DI 10.1103/PhysRevB.48.9021 PG 7 WC Physics, Condensed Matter SC Physics GA LY959 UT WOS:A1993LY95900058 ER PT J AU WALLACE, W AHLERS, ST GOTLIB, J BRAGIN, V SUGAR, J GLUCK, R SHEA, PA DAVIS, KL HAROUTUNIAN, V AF WALLACE, W AHLERS, ST GOTLIB, J BRAGIN, V SUGAR, J GLUCK, R SHEA, PA DAVIS, KL HAROUTUNIAN, V TI AMYLOID PRECURSOR PROTEIN IN THE CEREBRAL-CORTEX IS RAPIDLY AND PERSISTENTLY INDUCED BY LOSS OF SUBCORTICAL INNERVATION SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE NUCLEUS BASALIS OF MEYNERT; RAT ID ALZHEIMERS-DISEASE; NUCLEUS BASALIS; RATS; RECEPTOR AB Lesions of the cholinergic nucleus basalis of Meynert elevate the ex vivo synthesis of beta amyloid precursor protein (beta-APP) in the cerebral cortex, a major projection region. We have found that this elevation is reflected by increased levels of beta-APP mRNA. The induction is rapid (occurring 60 min after placement of the lesion) and persistent (remaining for at least 45 days after lesioning). Two other subcortical lesions, which result in reductions of cortical adrenergic and serotonergic innervation, similarly induced cortical beta-APP. The beta-APP induction is reversible and does not require loss of the subcortical neurons. Infusion of lidocaine, a calcium antagonist that disrupts neurotransmitter release, into the nucleus basalis of Meynert leads to the temporary reduction of released acetylcholine in the cortex. In this model, beta-APP mRNA levels are elevated shortly after the infusion of lidocaine (90 min) but return to preinfusion levels 7 days after the lidocaine treatment. However, metabolic stresses of the brain, including chronic physostigmine, glucocorticoid, and diabetogenic treatments, fail to induce the beta-APP response. These results suggest that the induction of beta-APP is a specific response to the loss of functional innervation in the cortex. Importantly, these studies show that cortical beta-APP is induced by lesions that mimic the neurochemical deficits most frequently observed in Alzheimer disease. C1 USN,MED RES INST,THERMAL STRESS ADAPTAT PROGRAM,BETHESDA,MD 20889. CUNY MT SINAI SCH MED,DEPT PSYCHIAT,NEW YORK,NY 10029. VET AFFAIRS MED CTR,BRONX,NY 10468. RP WALLACE, W (reprint author), ST ELIZABETH HOSP,CTR NEUROSCI,NATL INST MENTAL HLTH,WASHINGTON,DC 20032, USA. NR 15 TC 103 Z9 105 U1 0 U2 0 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 SEP 15 PY 1993 VL 90 IS 18 BP 8712 EP 8716 DI 10.1073/pnas.90.18.8712 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LX750 UT WOS:A1993LX75000086 PM 8378353 ER PT J AU MOZURKEWICH, G JACOBSEN, RL AF MOZURKEWICH, G JACOBSEN, RL TI ANALYSIS OF YOUNG MODULUS ANOMALY AT THE PEIERLS TRANSITION IN TAS3 SO SYNTHETIC METALS LA English DT Article ID CHARGE-DENSITY-WAVE; THERMODYNAMIC BEHAVIOR; THERMAL-EXPANSION; PHASE-TRANSITION; HEAT; CROSSOVER; FLUIDS; TC AB The temperature dependence of Young's modulus in o-TaS3 in the vicinity of the charge-density-wave phase transition is analyzed. It is assumed that strain enters the free energy through a strain-dependent transition temperature T(P). Successful fitting to data requires the inclusion of a quadratic term in the strain dependence, in addition to the usual linear one. This is equivalent to introducing a term in the modulus proportional to the charge-density-wave gap. The ratio between linear and quadratic terms is consistent with a previous measurement of the stress dependence of T(P). C1 USN, RES LAB, CODE 6341, WASHINGTON, DC 20375 USA. RP FORD MOTOR CO, RES LAB, MAILDROP 3028, DEARBORN, MI 48121 USA. NR 21 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD SEP 15 PY 1993 VL 60 IS 2 BP 137 EP 140 DI 10.1016/0379-6779(93)91232-Q PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA LZ074 UT WOS:A1993LZ07400008 ER PT J AU JUSTUS, BL HUSTON, AL CAMPILLO, AJ AF JUSTUS, BL HUSTON, AL CAMPILLO, AJ TI BROAD-BAND THERMAL OPTICAL LIMITER SO APPLIED PHYSICS LETTERS LA English DT Article ID NONLINEAR REFRACTION; ABSORPTION; SEMICONDUCTORS; MEDIA AB The limiting behavior of nigrosin dye dissolved in carbon disulfide was investigated in an f/5 defocusing geometry using 6 ns duration 532 nm laser excitation. Nigrosin dye is a broadband visible light absorber that is used here in conjunction with the large thermal nonlinearity of carbon disulfide solvent to defocus intense incident visible light. A limiting threshold energy of 40 nJ, corresponding to a fluence of only 100 mJ/cm2 in the solution, was observed with device absorption adjusted to 53%. RP JUSTUS, BL (reprint author), USN,RES LAB,CODE 5610,WASHINGTON,DC 20375, USA. NR 17 TC 74 Z9 74 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 SEP 13 PY 1993 VL 63 IS 11 BP 1483 EP 1485 DI 10.1063/1.109663 PG 3 WC Physics, Applied SC Physics GA LX161 UT WOS:A1993LX16100011 ER PT J AU STARKWEATHER, HW AVAKIAN, P FONTANELLA, JJ WINTERSGILL, MC AF STARKWEATHER, HW AVAKIAN, P FONTANELLA, JJ WINTERSGILL, MC TI INTERNAL MOTIONS IN POLYLACTIDE AND RELATED POLYMERS SO MACROMOLECULES LA English DT Article ID POLY(L-LACTIC ACID); COPOLYMERS; BEHAVIOR; CRYSTALLIZATION; RELAXATIONS AB Polylactide(approximately 95% L-isomer), polyglycolide, and a 1:1 copolymer were studied by differential scanning calorimetry, dynamic mechanical analysis, and dielectric relaxation. In addition to the previously known glass transitions, all of these polymers exhibit a relaxation similar to the beta-relaxation which occurs in many other materials. This relaxation, which occurs near 200 K at 1 kHz, is attributed to noncooperative local motions. Another new relaxation near 15 K was found in polyactide and the copolymer but not polyglycolide and hence is attributed to motions of the methyl side groups. The effect of increased humidity on polylactide was also investigated. The weight gain of the samples depends strongly on the relative humidity and continues over extended periods of time. Changes in the dielectric relaxation spectra were consistent with substantial decreases in molecular weight. C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP STARKWEATHER, HW (reprint author), DUPONT CO INC,CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880, USA. NR 18 TC 17 Z9 17 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 13 PY 1993 VL 26 IS 19 BP 5084 EP 5087 DI 10.1021/ma00071a016 PG 4 WC Polymer Science SC Polymer Science GA LX932 UT WOS:A1993LX93200016 ER PT J AU MALONE, JL PAPARELLO, SF MALONE, JD HILL, HE MYERS, JW WEISS, P AF MALONE, JL PAPARELLO, SF MALONE, JD HILL, HE MYERS, JW WEISS, P TI TUBERCULOSIS AND HIV-INFECTION SO LANCET LA English DT Letter C1 USN HOSP,OAKLAND,CA. USN HOSP,SAN DIEGO,CA 92134. NAVAL HOSP,PORTSMOUTH,VIC,AUSTRALIA. RP MALONE, JL (reprint author), USN,MED CTR,DIV INFECT DIS,BETHESDA,MD 20889, USA. NR 3 TC 2 Z9 2 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 SEP 11 PY 1993 VL 342 IS 8872 BP 677 EP 677 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA LX272 UT WOS:A1993LX27200034 PM 8103159 ER PT J AU LETAW, JR SILBERBERG, R TSAO, CH AF LETAW, JR SILBERBERG, R TSAO, CH TI COMPARISON OF DISTRIBUTED REACCELERATION AND LEAKY-BOX MODELS OF COSMIC-RAY ABUNDANCES (3-LESS-THAN-OR-EQUAL-TO-Z-LESS-THAN-OR-EQUAL-TO-28) SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCELERATION OF PARTICLES; COSMIC RAYS; ISM, ABUNDANCES ID ENERGY-SPECTRA; ACCELERATION; SECONDARY; ELEMENTS; NUCLEI AB A large collection of elemental and isotopic cosmic-ray data has been analyzed using the leaky-box transport model with and without reacceleration in the interstellar medium. Abundances of isotopes and elements with charges 3 less-than-or-equal-to Z less-than-or-equal-to 28 and energies 10 MeV nucleon-1 less-than-or-equal-to E less-than-or-equal-to 1 TeV nucleon-1 were explored. Our results demonstrate that reacceleration models make detailed and accurate predictions with the same number of parameters, or fewer, as standard leaky-box models. Ad hoc fitting parameters in the standard model are replaced by astrophysically significant reacceleration parameters. Distributed reacceleration models explain the peak in secondary-to-primary ratios around 1 GeV nucleon-1. They diminish the discrepancy between rigidity-dependent leakage and energy-independent anisotropy. They also offer the possibility of understanding isotopic anomalies at low energy (Silberberg et al. 1983). C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP LETAW, JR (reprint author), SEVERN COMMUN CORP,1023 BENFIELD BLVD,MILLERSVILLE,MD 21108, USA. NR 44 TC 21 Z9 21 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1993 VL 414 IS 2 BP 601 EP 611 DI 10.1086/173106 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LU946 UT WOS:A1993LU94600020 ER PT J AU WANG, YM SHEELEY, NR AF WANG, YM SHEELEY, NR TI UNDERSTANDING THE ROTATION OF CORONAL HOLES SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ACTIVITY; SUN, CORONA; SUN, MAGNETIC FIELDS; SUN, ROTATION ID MAGNETIC-FLUX TRANSPORT; DIFFERENTIAL ROTATION; RIGID ROTATION; WIND STREAMS; SOLAR-WIND; SUN; EVOLUTION; FIELDS AB In an earlier study we found that the rotation of coronal holes could be understood on the basis of a nearly current-free coronal field, with the holes representing open magnetic regions. In this paper we illustrate the model by focusing on the case of CHI, the rigidly rotating, boot-shaped hole observed by Skylab. We show that the interaction between the (axisymmetric) polar fields and the (nonaxisymmetric) flux associated with active regions produces distortions in the coronal field configuration and thus in the polar-hole boundaries; these distortions corotate with the perturbing nonaxisymmetric flux. In the case of CHI, positive-polarity field lines in the northern hemisphere ''collided'' with like-polarity field lines fanning out from a decaying active-region complex located just below the equator, producing a midlatitude corridor of open field lines rotating at the rate of the active region complex. Sheared coronal holes result when nonaxisymmetric flux is present at high latitudes, or equivalently, when the photospheric neutral line extends to high latitudes. We demonstrate how a small active region, rotating at the local photospheric rate, can drift through a rigidly rotating hole like CHI. Finally, we discuss the role of field-line reconnection in maintaining a quasi-potential coronal configuration. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7672, WASHINGTON, DC 20375 USA. NR 24 TC 76 Z9 76 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD SEP 10 PY 1993 VL 414 IS 2 BP 916 EP 927 DI 10.1086/173135 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LU946 UT WOS:A1993LU94600049 ER PT J AU HOBART, KD GODBEY, DJ THOMPSON, PE SIMONS, DS AF HOBART, KD GODBEY, DJ THOMPSON, PE SIMONS, DS TI SB SURFACE SEGREGATION AND DOPING IN SI(100) GROWN AT REDUCED TEMPERATURE BY MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID SILICON; LAYERS; ATOMS AB X-ray photoelectron spectroscopy, depth profiling with secondary ion mass spectrometry, and conductivity measurements have been performed on Sb-doped Si(100) -films grown at low temperature (350-degrees-C) by molecular beam epitaxy. The measurements reveal two important effects: (1) a significant increase in the surface segregation of Sb as the dopant concentration approaches 1 X 10(20) CM-3 , and (2) a decrease in surface segregation as the surface concentration of Sb reaches one monolayer. We believe that the presence of this monolayer of Sb is responsible for the surface segregation becoming self-limited and the associated bulk concentration exceeding 1 X 10(20) CM-3. C1 NATL INST STAND & TECHNOL,DIV SURFACE & MICROANAL SCI,GAITHERSBURG,MD 20899. RP HOBART, KD (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6812,WASHINGTON,DC 20375, USA. NR 12 TC 17 Z9 17 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 6 PY 1993 VL 63 IS 10 BP 1381 EP 1383 DI 10.1063/1.109683 PG 3 WC Physics, Applied SC Physics GA LW183 UT WOS:A1993LW18300028 ER PT J AU COHN, JL KRESIN, VZ REEVES, ME WOLF, SA AF COHN, JL KRESIN, VZ REEVES, ME WOLF, SA TI SUPERCONDUCTING-STATE THERMAL TRANSPORT IN YBA2CU3O7-DELTA SO PHYSICAL REVIEW LETTERS LA English DT Note ID HIGH-TC SUPERCONDUCTORS; UNTWINNED YBA2CU3O7-DELTA; CONDUCTIVITY C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375. CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. RP COHN, JL (reprint author), UNIV MIAMI,DEPT PHYS,CORAL GABLES,FL 33124, USA. RI Wolf, Stuart/A-7513-2009 NR 11 TC 26 Z9 26 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 6 PY 1993 VL 71 IS 10 BP 1657 EP 1657 DI 10.1103/PhysRevLett.71.1657 PG 1 WC Physics, Multidisciplinary SC Physics GA LW231 UT WOS:A1993LW23100046 ER PT J AU GOODMAN, EM GREENEBAUM, B MARRON, MT AF GOODMAN, EM GREENEBAUM, B MARRON, MT TI ALTERED PROTEIN-SYNTHESIS IN A CELL-FREE SYSTEM EXPOSED TO A SINUSOIDAL MAGNETIC-FIELD SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE CELL-FREE EXPRESSION SYSTEM; TRANSCRIPTION TRANSLATION; MAGNETIC FIELD; RNA POLYMERASE ID ESCHERICHIA-COLI; RNA-POLYMERASE; CANCER AB This report describes a new approach for examining weak extremely low frequency (ELF) electric and magnetic field interactions with living systems that exploits a cell-free transcription/translation system derived from Escherichia coli. Using two-dimensional polyacrylamide gel electrophoresis we previously had determined that the level of the alpha subunit of RNA polymerase in intact E. coli was elevated by exposure to weak ELF magnetic fields. In this paper, plasmids containing the alpha, or both the beta,beta' subunits of the RNA polymerase from E. coli were placed into a cell-free expression system. When this transcription/translation system was exposed to a 72-Hz sinusoidal magnetic field in the range 0.07 to 1.1 mT (rms) for periods of 5 min to 1 h, expression was enhanced. Weaker fields must be applied longer to produce an effect. For 10 min of field exposure, the threshold for an effect is 0.1 mT. These experiments demonstrate that an intact membrane is not an absolute requirement for transducing magnetic bio-effects. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP GOODMAN, EM (reprint author), UNIV WISCONSIN PARKSIDE,INST BIOMED RES,KENOSHA,WI 53141, USA. NR 17 TC 37 Z9 38 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD SEP 3 PY 1993 VL 1202 IS 1 BP 107 EP 112 DI 10.1016/0167-4838(93)90070-8 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA LY161 UT WOS:A1993LY16100016 PM 8373813 ER PT J AU HUBA, JD AF HUBA, JD TI GENERATION OF WAVES IN THE VENUS MANTLE BY THE ION-ACOUSTIC BEAM INSTABILITY SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID BAND ELECTROSTATIC NOISE; EARTHS BOW SHOCK; PLASMA-WAVES; MAGNETOTAIL AB The ion acoustic beam instability is suggested as a mechanism to produce wave turbulence observed in the Venus mantle at frequencies 100 Hz and 730 Hz. The plasma is assumed to consist of a stationary, cold O+ ion plasma and a flowing, shocked solar wind plasma. The O+ ions appear as a beam relative to the flowing ionosheath plasma which provides the free energy to drive the instability. The plasma is driven unstable by inverse electron Landau damping of an ion acoustic wave associated with the cold, ionospheric O+ ions. The instability can directly generate the observed 100 Hz waves in the Venus mantle, as well as the observed 730 Hz waves through the Doppler shift of the frequency caused by the satellite motion. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 15 TC 16 Z9 16 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 3 PY 1993 VL 20 IS 17 BP 1751 EP 1754 DI 10.1029/93GL01984 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LW834 UT WOS:A1993LW83400003 ER PT J AU HOLLAND, DL CHEN, J AF HOLLAND, DL CHEN, J TI SELF-CONSISTENT CURRENT SHEET STRUCTURES IN THE QUIET-TIME MAGNETOTAIL SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID TAIL CURRENT SHEET; MAGNETIC-FIELD; NEUTRAL SHEET; PLASMA SHEET; INSTABILITY; DYNAMICS AB The structure of the quiet-time magnetotail is studied using a test particle simulation. Vlasov equilibria are obtained in the regime where v(D) = E(y) c/B(z) is much less than the ion thermal velocity and are self-consistent in that the current and magnetic field satisfy Ampere's law. Force balance between the plasma and magnetic field is satisfied everywhere. The global structure of the current sheet is found to be critically dependent on the source distribution function. The pressure tensor is nondiagonal in the current sheet with anisotropic temperature. A kinetic mechanism is proposed whereby changes in the source distribution results in a thinning of the current sheet. RP HOLLAND, DL (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 19 TC 41 Z9 41 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD SEP 3 PY 1993 VL 20 IS 17 BP 1775 EP 1778 DI 10.1029/93GL01976 PG 4 WC Geosciences, Multidisciplinary SC Geology GA LW834 UT WOS:A1993LW83400009 ER PT J AU SINGH, DJ KRAKAUER, H HAAS, C PICKETT, WE AF SINGH, DJ KRAKAUER, H HAAS, C PICKETT, WE TI THEORETICAL DETERMINATION THAT ELECTRONS ACT AS ANIONS IN THE ELECTRIDE CS+(15-CROWN-5)2.E- SO NATURE LA English DT Article ID ALKALIDES AB ELECTRIDES are crystalline salts formed from complexed alkali-metal cations. There has been some dispute as to whether the valence electron from the alkali ion becomes a trapped interstitial anion1,2 or resides at or near the alkali-metal nucleus3. If the former description holds, electrides would represent stoichiometric counterparts of ionic insulators containing 'F-centre' electronic defects. Experiments1,2 have so far failed to resolve the question. Here we present ab initio self-consistent density-functional calculations4 of the electron distribution in the electride Cs+(15-crown-5)2.e-. We find that a spatially localized electron is located at the anion site, in accord with the F-centre model. Although the potential is in fact repulsive in this region, the electron is apparently forced to reside here by the need to lower its kinetic energy. We suggest that this picture may hold for other electrides as well. C1 COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23187. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012; OI Krakauer, Henry/0000-0003-2517-0957 NR 11 TC 50 Z9 50 U1 4 U2 16 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD SEP 2 PY 1993 VL 365 IS 6441 BP 39 EP 42 DI 10.1038/365039a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LV646 UT WOS:A1993LV64600047 ER PT J AU HEATON, RB ROSS, JJ JOCHUM, JM HENRY, MR AF HEATON, RB ROSS, JJ JOCHUM, JM HENRY, MR TI CYTOLOGIC DIAGNOSIS OF CHOLESTEROL GRANULOMA - A CASE-REPORT SO ACTA CYTOLOGICA LA English DT Note ID ORBIT AB Cholesterol granuloma is a rare lesion of the orbit occurring in adults and must be distinguished from epidermoid cholesteatoma and other mass lesions of the orbit. We report the case of a 31-year-old man who presented to our institution with right eye proptosis secondary to a soft tissue mass. At surgery, cyst fluid from the lesion was sent for cytologic evaluation. The fluid was remarkable for numerous inflammatory cells, blood breakdown products, multinucleate giant cells and cholesterol crystals. The absence of squamous- or respiratory-type epithelium led to a diagnosis of cholesterol granuloma. This was confirmed by histologic examination of the tissue submitted. The differential diagnosis and cytologic features of orbital lesions are discussed. C1 USN,MED CTR,DEPT LAB MED,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 9 TC 9 Z9 9 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0001-5547 J9 ACTA CYTOL JI Acta Cytol. PD SEP-OCT PY 1993 VL 37 IS 5 BP 713 EP 716 PG 4 WC Pathology SC Pathology GA LX862 UT WOS:A1993LX86200013 PM 8362584 ER PT J AU ADAMS, JH BEAUJEAN, R BOBERG, PR GRIGOROV, NL KONDRATYEVA, MA MASON, GM MCGUIRE, RE MEWALDT, RA PANASYUK, MI TRETYAKOVA, CA TYLKA, AJ ZHURAVLEV, DA AF ADAMS, JH BEAUJEAN, R BOBERG, PR GRIGOROV, NL KONDRATYEVA, MA MASON, GM MCGUIRE, RE MEWALDT, RA PANASYUK, MI TRETYAKOVA, CA TYLKA, AJ ZHURAVLEV, DA TI DETERMINING THE CHARGE STATES OF SOLAR ENERGETIC IONS DURING LARGE GEOMAGNETIC STORMS SO ADVANCES IN SPACE RESEARCH LA English DT Article ID PARTICLES; RAYS AB We give a progress report on a new method of measuring the mean ionic charge states of solar energetic particles (SEPs) and apply this method to oxygen ions at energies of approximately 10 MeV/nucleon. We compare simultaneous flux measurements inside and outside the magnetosphere to determine the geomagnetic transmission and use this result to find the corresponding mean ionic charge state. The key to this method is to determine the dependence of the geomagnetic transmission function on the mean ionic charge state of the ions. We report here the results of a new technique to calculate the geomagnetic transmission function, which attempts to account for the cutoff suppression caused by the geomagnetic activity which often accompanies SEP events. C1 CHRISTIAN ALBRECHTS UNIV KIEL,INST REINE & ANGEW KERNPHYS,W-2300 KIEL 1,GERMANY. MOSCOW MV LOMONOSOV STATE UNIV,NUCL PHYS RES INST,MOSCOW 119899,RUSSIA. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. CALTECH,DOWNS LAB 22047,PASADENA,CA 91125. UNIV MARYLAND,DEPT PHYS,COLL PK,MD 20742. UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLL PK,MD 20742. RP ADAMS, JH (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7654,WASHINGTON,DC 20375, USA. RI Panasyuk, Mikhail/E-2005-2012; Tylka, Allan/G-9592-2014 NR 17 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD SEP PY 1993 VL 13 IS 9 BP 367 EP 370 DI 10.1016/0273-1177(93)90507-8 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LX184 UT WOS:A1993LX18400058 ER PT J AU FLUDRA, A CULHANE, JL BENTLEY, RD DOSCHEK, GA HIEI, E PHILLIPS, KJH STERLING, A WATANABE, T AF FLUDRA, A CULHANE, JL BENTLEY, RD DOSCHEK, GA HIEI, E PHILLIPS, KJH STERLING, A WATANABE, T TI DETERMINATION OF CORONAL ABUNDANCES OF SULFUR, CALCIUM AND IRON USING THE YOHKOH BRAGG CRYSTAL SPECTROMETER SO ADVANCES IN SPACE RESEARCH LA English DT Article ID DIELECTRONIC SATELLITE SPECTRA; HELIUM-LIKE IONS; SOLAR-FLARES; INNER-SHELL; EMISSION; PLASMAS AB Using spectra from the Bragg Crystal Spectrometer on Yohkoh we have derived coronal abundances of sulphur, calcium and iron during several flares from the ratio of the flux in the resonance line to the nearby continuum. Multi-thermal effects have been taken into account using differential emission measure analysis. We have also determined the abundance of S in cool active regions during a period of very low solar activity. We compare the coronal abundances of S, Ca and Fe with their photospheric values. C1 USN,RES LAB,WASHINGTON,DC 20375. NATL ASTRON OBSERV JAPAN,MITAKA,JAPAN. COMPUTAT PHYS INC,ANNANDALE,VA. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. RP FLUDRA, A (reprint author), UNIV LONDON UNIV COLL,MULLARD SPACE SCI LAB,LONDON WC1E 6BT,ENGLAND. NR 16 TC 22 Z9 22 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD SEP PY 1993 VL 13 IS 9 BP 395 EP 398 DI 10.1016/0273-1177(93)90511-9 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LX184 UT WOS:A1993LX18400062 ER PT J AU LIN, RP DENNIS, BR EMSLIE, AG RAMATY, R CANFIELD, R DOSCHEK, G AF LIN, RP DENNIS, BR EMSLIE, AG RAMATY, R CANFIELD, R DOSCHEK, G TI THE NASA HIGH-ENERGY SOLAR PHYSICS (HESP) MISSION FOR THE NEXT SOLAR MAXIMUM SO ADVANCES IN SPACE RESEARCH LA English DT Article ID X-RAY-BURSTS; COLLISIONLESS CONDUCTION FRONT; FLARES; PARTICLES; SPECTRA AB The NASA High Energy Solar Physics (HESP) mission offers the opportunity for major breakthroughs in our understanding of the fundamental energy release and particle acceleration processes at the core of the solar flare problem. HESP's primary strawman instrument, the High Energy Imaging Spectrometer (HEISPEC). will provide X-ray and gamma-ray imaging spectroscopy, i.e., high-resolution spectroscopy at each spatial point in the image. It has the following unique capabilities: (1) high-resolution (approximately keV) spectroscopy from 2 keV - 20 MeV to resolve flare gamma-ray lines and sharp features in the continuum; (2) hard X-ray imaging with 2'' angular resolution and tens of millisecond temporal resolution, commensurate with the travel and stopping distances and times for the accelerated electrons; (3) gamma-ray imaging with 4''-8'' resolution with the capability of imaging in specific lines or continuum regions; (4) moderate resolution imaging of energetic (20 MeV to approximately 1 GeV) gamma-rays and neutrons. Additional strawman instruments include a Bragg crystal spectrometer for diagnostic information and a soft X-ray/XUV/UV imager to map the flare coronal magnetic field and plasma structure. The HESP mission also includes extensive ground-based observational and supporting theory programs. Presently BESP is planned for a FY 1995 new start and late 1999 launch. in time for the next solar activity maximum. C1 UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. UNIV ALABAMA,HUNTSVILLE,AL 35899. UNIV HAWAII,HONOLULU,HI 96822. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. USN,RES LAB,WASHINGTON,DC 20375. RP LIN, RP (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Dennis, Brian/C-9511-2012 NR 32 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD SEP PY 1993 VL 13 IS 9 BP 401 EP 410 DI 10.1016/0273-1177(93)90512-A PG 10 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LX184 UT WOS:A1993LX18400063 ER PT J AU CULHANE, JL PHILLIPS, AT PIKE, CD FLUDRA, A BENTLEY, RD BROMAGE, B DOSCHEK, GA HIEI, E INDA, M MARISKA, JT PHILLIPS, KJH STERLING, AC WATANABE, T AF CULHANE, JL PHILLIPS, AT PIKE, CD FLUDRA, A BENTLEY, RD BROMAGE, B DOSCHEK, GA HIEI, E INDA, M MARISKA, JT PHILLIPS, KJH STERLING, AC WATANABE, T TI YOHKOH OBSERVATIONS OF PLASMA UPFLOWS DURING SOLAR-FLARES SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article ID SPECTROMETER AB Observations of two flares, an M 2.2 event on 16 December, 1991 and the precursor to an XI flare on 15 November, 1991 are presented. Spectra obtained with the Bragg Crystal Spectrometer (BCS) are compared with data from the Hard and Soft X-ray Telescopes (HXT, SXT) and the Wide Band Spectrometer (WBS) on the satellite. For both events the creation of upflowing plasma is detected. While the first event seems to conform well to the chromospheric evaporation model for high temperature plasma production, the behaviour for the second event is more complex. C1 RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. USN, RES LAB, WASHINGTON, DC 20375 USA. NATL ASTRONM OBSERV JAPAN, TOKYO, JAPAN. UNIV TOKYO, DEPT PHYS, BUNKYO KU, TOKYO 113, JAPAN. COMPUTAT PHYS INC, ANNANDALE, VA USA. RP CULHANE, JL (reprint author), UCL, MULLARD SPACE SCI LAB, HOLMBURY ST MARY RH5 6NT, SURREY, ENGLAND. NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD SEP PY 1993 VL 13 IS 9 BP 303 EP 306 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LX184 UT WOS:A1993LX18400046 ER PT J AU VARGHESE, AN RAAD, PE AF VARGHESE, AN RAAD, PE TI PARALLELIZATION OF THE FACTORED IMPLICIT FINITE-DIFFERENCE TECHNIQUE SO AIAA JOURNAL LA English DT Note C1 SO METHODIST UNIV,DEPT MECH ENGN,DALLAS,TX 75275. RP VARGHESE, AN (reprint author), USN,CTR UNDERSEA WARFARE,CODE 8232,BLDG 108,NEWPORT,RI 02841, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD SEP PY 1993 VL 31 IS 9 BP 1725 EP 1727 DI 10.2514/3.49100 PG 3 WC Engineering, Aerospace SC Engineering GA LU625 UT WOS:A1993LU62500025 ER PT J AU BOYCE, K HENJUM, S HELMER, G CHEN, PS AF BOYCE, K HENJUM, S HELMER, G CHEN, PS TI RADIOFREQUENCY CATHETER ABLATION OF THE ACCESSORY PATHWAY IN THE PERMANENT FORM OF JUNCTIONAL RECIPROCATING TACHYCARDIA SO AMERICAN HEART JOURNAL LA English DT Note C1 DEPT VET AFFAIRS MED CTR,DEPT MED,DIV CARDIOL,SAN DIEGO,CA. USN HOSP,DEPT INTERNAL MED,DIV CARDIOL,SAN DIEGO,CA 92134. RP BOYCE, K (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0002-8703 J9 AM HEART J JI Am. Heart J. PD SEP PY 1993 VL 126 IS 3 BP 716 EP 719 DI 10.1016/0002-8703(93)90428-C PN 1 PG 4 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA LW176 UT WOS:A1993LW17600033 PM 8362733 ER PT J AU RICHARDS, AL HYAMS, KC WATTS, DM ROZMAJZL, PJ WOODY, JN MERRELL, BR AF RICHARDS, AL HYAMS, KC WATTS, DM ROZMAJZL, PJ WOODY, JN MERRELL, BR TI RESPIRATORY-DISEASE AMONG MILITARY PERSONNEL IN SAUDI-ARABIA DURING OPERATION DESERT SHIELD SO AMERICAN JOURNAL OF PUBLIC HEALTH LA English DT Article ID TRACT INFECTIONS; UNITED-STATES; ARMY TRAINEES; SILICA AB Objectives. The purpose of this study was to determine whether respiratory disease due to crowded living conditions and high levels of suspended and blowing sand had a major adverse impact on US military personnel during Operation Desert Shield. Methods. A questionnaire survey was administered to 2598 combat troops stationed in Northeast Saudi Arabia for a mean of 102 days. Samples of surface sand from seven different locations were analyzed by scanning electron microscopy and x-ray diffraction. Results. Among surveyed troops, 34.4% reported a sore throat, 43.1% complained of a cough, 15.4% complained of chronic rhinorrhea, and 1.8% were unable to perform their routine duties because of upper respiratory symptoms. Evaluation of sleePing accommodations indicated that complaints of a sore throat and cough were most closely associated with sleeping in air-conditioned buildings; in contrast, complaints of rhinorrhea were associated with exposure to the outdoor environment while living in tents. Sand samples consisted mostly of quartz, with just 0.21% by weight of respirable size (< 10 mum in diameter). Conclusions. These findings indicate that upper respiratory complaints were frequent among Operation Desert Shield troops and were related both to the troops' housing and to their exposure to the outside environment. C1 USN,MED RES INST,DEPT MICROBIOL IMMUNOL,BETHESDA,MD. USN,MED RES UNIT 3,DIV VIROL,CAIRO,EGYPT. USN,MED RES INST,RICKETTSIAL DIS PROGRAM,ROCKVILLE,MD 20852. USN,MED RES INST,DIV EPIDEMIOL,ROCKVILLE,MD 20852. NR 27 TC 45 Z9 45 U1 1 U2 3 PU AMER PUBLIC HEALTH ASSOC INC PI WASHINGTON PA 1015 FIFTEENTH ST NW, WASHINGTON, DC 20005 SN 0090-0036 J9 AM J PUBLIC HEALTH JI Am. J. Public Health PD SEP PY 1993 VL 83 IS 9 BP 1326 EP 1329 DI 10.2105/AJPH.83.9.1326 PG 4 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA LV708 UT WOS:A1993LV70800026 PM 8363011 ER PT J AU KHALIFA, AS MITCHELL, BS WATTS, DM ELSAMAHY, MH ELSAYED, MH HASSAN, NF JENNINGS, GB HIBBS, RG CORWIN, AL AF KHALIFA, AS MITCHELL, BS WATTS, DM ELSAMAHY, MH ELSAYED, MH HASSAN, NF JENNINGS, GB HIBBS, RG CORWIN, AL TI PREVALENCE OF HEPATITIS-C VIRAL ANTIBODY IN TRANSFUSED AND NONTRANSFUSED EGYPTIAN CHILDREN SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID NON-B-HEPATITIS; ACUTE LYMPHOBLASTIC-LEUKEMIA; CHRONIC LIVER-DISEASE; BLOOD-DONORS; NON-A; VIRUS-INFECTION; RECIPIENTS AB Hepatitis C (HCV) virus is recognized as the major cause of what was previously referred to as parenterally acquired (blood-mediated) non-A, non-B hepatitis. A study involving 252 transfused and nontransfused Egyptian children was conducted from November 1990 through February 1991 to determine the prevalence of HCV and the role of blood and blood and blood product transfusions in the spread of the virus. Serum specimens were assayed by a second generation enzyme immunoassay and were considered reactive only after supplemental testing using the second generation recombinant immunoblot assay. Prevalence among 84 young study subjects with hematologic disorders was 55% (46 of 84), while no HCV antibodies were detected among the two nonhematologic pediatric populations studied: 84 hospital admissions and 84 acutely ill but otherwise healthy outpatients (seeking treatment for symptoms associated with a new condition less than three weeks old in the absence of any chronic health problem). Ninety-two percent (77 of 84) of the-hematology-related cases had medical histories of multiple transfusions. Positive antibody responses (46) were significantly associated with increased duration of illness (P < 0.001) and the volume and number of transfusions (P < 0.01) when compared with negative ones (38). However, prior hospitalization and/or surgery were not related to HCV antibody status. The high prevalence of HCV antibody among multiply transfused infants and children suggests that blood and blood product supplies should be regularly screened for HCV antibody. C1 AIN SHAMS UNIV,FAC MED,CAIRO,EGYPT. USN,MED RES UNIT 3,CAIRO,EGYPT. USN,CTR ENVIRONM HLTH,NORFOLK,VA 23511. RP KHALIFA, AS (reprint author), USN,MED RES UNIT 2,PUBLICAT OFF,BOX 3,UNIT 8132,APD AP 96520,JAKARTA,INDONESIA. NR 14 TC 28 Z9 27 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD SEP PY 1993 VL 49 IS 3 BP 316 EP 321 PG 6 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA LY612 UT WOS:A1993LY61200005 PM 7690525 ER PT J AU JASON, PK AF JASON, PK TI VIETNAM AND THE SOUTHERN IMAGINATION - GILMAN,OW SO AMERICAN LITERATURE LA English DT Book Review RP JASON, PK (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU DUKE UNIV PRESS PI DURHAM PA BOX 90660, DURHAM, NC 27708-0660 SN 0002-9831 J9 AM LIT JI Am. Lit. PD SEP PY 1993 VL 65 IS 3 BP 611 EP 612 DI 10.2307/2927423 PG 2 WC Literature, American SC Literature GA LU519 UT WOS:A1993LU51900038 ER PT J AU MAHER, D WATERS, J LEIVERS, D BURGER, G AF MAHER, D WATERS, J LEIVERS, D BURGER, G TI PATIENT AND SURGEON SATISFACTION WITH EXTREMITY BLOCKADE FOR SURGERY IN REMOTE LOCATIONS SO ANESTHESIOLOGY LA English DT Meeting Abstract C1 USN HOSP,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD SEP PY 1993 VL 79 IS 3A SU S BP A1068 EP A1068 PG 1 WC Anesthesiology SC Anesthesiology GA LY108 UT WOS:A1993LY10801064 ER PT J AU SWENSON, J HULLANDER, M AF SWENSON, J HULLANDER, M TI THE EFFECT OF INTRATHECAL SUFENTANIL ON ISOFLURANE REQUIREMENTS DURING LOWER ABDOMINAL-SURGERY - RESULTS OF A DOUBLE-BLIND-STUDY SO ANESTHESIOLOGY LA English DT Meeting Abstract C1 USN HOSP,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. NR 3 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD SEP PY 1993 VL 79 IS 3A SU S BP A345 EP A345 PG 1 WC Anesthesiology SC Anesthesiology GA LY108 UT WOS:A1993LY10800345 ER PT J AU WATERS, J HOWARD, R HOWARD, M LESNIK, I BURGER, G AF WATERS, J HOWARD, R HOWARD, M LESNIK, I BURGER, G TI IMPACT ON SERUM POTASSIUM OF TROMETHAMINE (THAM) INFUSIONS IN THE ACIDOTIC RABBIT MODEL SO ANESTHESIOLOGY LA English DT Meeting Abstract C1 USN HOSP,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. NR 1 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD SEP PY 1993 VL 79 IS 3A SU S BP A772 EP A772 PG 1 WC Anesthesiology SC Anesthesiology GA LY108 UT WOS:A1993LY10800772 ER PT J AU WATERS, J HOWARD, R HOWARD, M LESNIK, I BURGER, G AF WATERS, J HOWARD, R HOWARD, M LESNIK, I BURGER, G TI THE EFFECT OF HYPOXIA ON PLASMA POTASSIUM CONCENTRATION SO ANESTHESIOLOGY LA English DT Meeting Abstract C1 USN HOSP,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. NR 2 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD SEP PY 1993 VL 79 IS 3A SU S BP A765 EP A765 PG 1 WC Anesthesiology SC Anesthesiology GA LY108 UT WOS:A1993LY10800765 ER PT J AU HENDERSON, FC GEDDES, JF CROCKARD, HA AF HENDERSON, FC GEDDES, JF CROCKARD, HA TI NEUROPATHOLOGY OF THE BRAIN-STEM AND SPINAL-CORD IN END-STAGE RHEUMATOID-ARTHRITIS - IMPLICATIONS FOR TREATMENT SO ANNALS OF THE RHEUMATIC DISEASES LA English DT Article ID CERVICAL SPONDYLOTIC MYELOPATHY; NATURAL-HISTORY; COMPRESSION; SUBLUXATION; ISCHEMIA AB Objective To study the detailed histopathological changes in the brainstem and spinal cord in nine patients with severe end stage rheumatoid arthritis, all with clinical myelopathy and craniocervical compression. Methods-At necropsy the sites of bony pathology were related exactly to cord segMents and histological changes, and correlated with clinical and radiological findings. Results-Cranial nerve and brainstem pathology was rare. In addition to the obvious craniocervical compression, there were widespread subaxial changes in the spinal cord. Pathology was localised primarily to the dorsal white matter and there was no evidence of vasculitis or ischaemic changes. Conclusions-Myelopathy in rheumatoid arthritis is probably caused by the effects of compression, stretch, and movement, not ischaemia. The additional subaxial compression may be an important component in the clinical picture, and may explain why craniocervical decompression alone may not alleviate neurological signs. C1 NATL HOSP NEUROL & NEUROSURG,DEPT SURG NEUROL,QUEEN SQ,LONDON WC1N 3BG,ENGLAND. UNIV LONDON LONDON HOSP,COLL MED,DEPT MORBID ANAT,LONDON E1 1BB,ENGLAND. USN,MED CTR,DEPT NEUROSURG,BETHESDA,MD 20814. NR 85 TC 28 Z9 29 U1 0 U2 0 PU BRITISH MED JOURNAL PUBL GROUP PI LONDON PA BRITISH MED ASSOC HOUSE, TAVISTOCK SQUARE, LONDON, ENGLAND WC1H 9JR SN 0003-4967 J9 ANN RHEUM DIS JI Ann. Rheum. Dis. PD SEP PY 1993 VL 52 IS 9 BP 629 EP 637 DI 10.1136/ard.52.9.629 PG 9 WC Rheumatology SC Rheumatology GA LY749 UT WOS:A1993LY74900002 PM 8239756 ER PT J AU HUNTER, WR SEELY, JF AF HUNTER, WR SEELY, JF TI LOW-RADIATION-DAMAGE MULTILAYER COATINGS FOR THE SOFT-X-RAY REGION SO APPLIED OPTICS LA English DT Article ID AMPLIFICATION AB Highly reflecting multilayer coatings used to form resonant cavities for soft-x-ray lasers or for other high-intensity applications (free-electron lasers, x-ray projection lithography, etc.) can be destroyed by strong electric fields generated at the multilayer boundaries. Electric-field strengths can be reduced at the boundaries by altering slightly the layer thicknesses of the final or topmost layers. Calculations are presented showing reduced field strengths caused by altering final-layer thicknesses. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP HUNTER, WR (reprint author), SFA INC, 1401 MCCORMICK DR, LANDOVER, MD 20785 USA. NR 15 TC 3 Z9 3 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 SEP 1 PY 1993 VL 32 IS 25 BP 4846 EP 4851 PG 6 WC Optics SC Optics GA LU727 UT WOS:A1993LU72700025 PM 20830156 ER PT J AU BARBEE, TW RIFE, JC HUNTER, WR KOWALSKI, MP CRUDDACE, RG SEELY, JF AF BARBEE, TW RIFE, JC HUNTER, WR KOWALSKI, MP CRUDDACE, RG SEELY, JF TI LONG-TERM STABILITY OF A MO/SI MULTILAYER STRUCTURE SO APPLIED OPTICS LA English DT Article DE MULTILAYERS; THIN-FILM INTERFERENCE COATINGS; EXTREME ULTRAVIOLET ID GRATING-CRYSTAL MONOCHROMATOR; PERFORMANCE AB The normal-incidence reflectance of a Mo/Si multilayer mirror, with peak reflectance near 130 angstrom, was measured over a period of 20 months by using synchrotron radiation. The measured reflectances were unchanged over this period of time, and this indicates that the material layers and interfaces were stable. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. SPA INC, LANDOVER, MD 20785 USA. RP BARBEE, TW (reprint author), LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. NR 6 TC 27 Z9 27 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 SEP 1 PY 1993 VL 32 IS 25 BP 4852 EP 4854 PG 3 WC Optics SC Optics GA LU727 UT WOS:A1993LU72700026 PM 20830157 ER PT J AU SEELY, JF KOWALSKI, MP HUNTER, WR RIFE, JC BARBEE, TW HOLLAND, GE BOYER, CN BROWN, CM AF SEELY, JF KOWALSKI, MP HUNTER, WR RIFE, JC BARBEE, TW HOLLAND, GE BOYER, CN BROWN, CM TI ON-BLAZE OPERATION OF A MO/SI MULTILAYER-COATED, CONCAVE DIFFRACTION GRATING IN THE 136-142-(A)CAP WAVELENGTH REGION AND NEAR NORMAL INCIDENCE SO APPLIED OPTICS LA English DT Article DE DIFFRACTION GRATING; MULTILAYER COATING; EXTREME ULTRAVIOLET ID EXTREME-ULTRAVIOLET; PERFORMANCE; MONOCHROMATOR AB The efficiency and resolving power of a concave, 2400-groove/mm, blazed diffraction grating that had a Mo/Si multilayer coating were determined. The multilayer coating had a peak reflectance of 55% at 140-angstrom near normal incidence. The efficiency of the multilayer grating for wavelengths in the 136-139-angstrom range was 2% near normal incidence. This efficiency was a factor of 150 greater than the efficiency of a sister replica Au-coated grating in the same wavelength region. The resolving power of the multilayer-coated grating in the third order of a V VIII transition with a first-order wavelength of 140.451 angstrom was 9100. Comparisons with the Au-coated grating indicated that the application of the multilayer coating did not affect the resolving power or the blaze angle. C1 UNIV SPACE RES ASSOC, WASHINGTON, DC 20024 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. SFA INC, LANDOVER, MD 20785 USA. RP SEELY, JF (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 15 TC 30 Z9 30 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 SEP 1 PY 1993 VL 32 IS 25 BP 4890 EP 4897 PG 8 WC Optics SC Optics GA LU727 UT WOS:A1993LU72700033 PM 20830164 ER PT J AU WADE, DS MORROW, SE BALSARA, ZN BURKHARD, TK GOFF, WB AF WADE, DS MORROW, SE BALSARA, ZN BURKHARD, TK GOFF, WB TI ACCURACY OF ULTRASOUND IN THE DIAGNOSIS OF ACUTE APPENDICITIS COMPARED WITH THE SURGEONS CLINICAL IMPRESSION SO ARCHIVES OF SURGERY LA English DT Article; Proceedings Paper CT 64TH ANNUAL MEETING OF THE PACIFIC-COAST-SURGICAL-ASSOC CY FEB 15-17, 1993 CL SCOTTSDALE, AZ SP PACIFIC COAST SURG ASSOC ID ULTRASONOGRAPHY; SONOGRAPHY; CHILDREN AB Objective: To compare the accuracy of the surgeon's clinical diagnosis of acute appendicitis with that of an ultrasonographic examination of the abdomen. Design: Prospective trial. Setting: US Naval Hospital, San Diego, Calif. Patients: One hundred ten patients admitted to the hospital with suspected appendicitis from May 1990 to June 1992. Intervention: Symptoms and signs for each patient were recorded, along with the surgeon's clinical impression of immediate surgery or observation. The patient then underwent an ultrasound examination performed by a staff radiologist. On the basis of the ultrasound findings the patient was placed into one of three categories: appendicitis, normal examination results, or other conditions. Patients with an ultrasound-based diagnosis of appendicitis proceeded to the operation, regardless of the surgeon's clinical impression. Those with other conditions diagnosed with ultrasonography were treated as was appropriate for the condition. Results: The ultrasound-derived diagnosis of appendicitis had a sensitivity of 85.5%, a specificity of 84.4%, a positive predictive value of 88.3%, a negative predictive value of 80.1%, and an overall accuracy of 85.0%. The surgeon's clinical impression at the time of admission had a sensitivity of 62.9%, a specificity of 82.2%, a positive predictive value of 82.9%, a negative predictive value of 61.7%, and an overall accuracy of 71.2%. Conclusion: The overall accuracy of ultrasonography in the diagnosis of appendicitis was statistically superior to that of the surgeon's clinical impression (P<.0001). However, 24% of the patients with normal ultrasound findings were ultimately found to have appendicitis at operation, emphasizing the point that ultrasonography cannot be relied on to the exclusion of the surgeon's careful and repeated evaluation. C1 USN HOSP,DEPT RADIOL,OAKLAND,CA 94627. UNIFORMED SERV UNIV HLTH SCI,DEPT SURG,BETHESDA,MD 20814. RP WADE, DS (reprint author), USN HOSP,DEPT SURG,OAKLAND,CA 94627, USA. NR 27 TC 79 Z9 83 U1 0 U2 3 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 SEP PY 1993 VL 128 IS 9 BP 1039 EP 1046 PG 8 WC Surgery SC Surgery GA LW001 UT WOS:A1993LW00100014 PM 8368922 ER PT J AU EYRE, DP AF EYRE, DP TI TRAPPINGS OF POWER - BALLISTIC-MISSILES IN THE THIRD-WORLD - NOLAN,JE SO ARMED FORCES & SOCIETY LA English DT Book Review C1 STANFORD UNIV,DEPT SOCIOL,STANFORD,CA 94305. RP EYRE, DP (reprint author), USN,POSTGRAD SCH,DEPT NATL SECUR AFFAIRS,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD FAL PY 1993 VL 20 IS 1 BP 152 EP 155 DI 10.1177/0095327X9302000112 PG 4 WC Political Science; Sociology SC Government & Law; Sociology GA ML223 UT WOS:A1993ML22300011 ER PT J AU STOCKTON, PN AF STOCKTON, PN TI CONGRESS AND NUCLEAR-WEAPONS - LINDSAY,JM SO ARMED FORCES & SOCIETY LA English DT Book Review RP STOCKTON, PN (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD FAL PY 1993 VL 20 IS 1 BP 155 EP 157 DI 10.1177/0095327X9302000113 PG 3 WC Political Science; Sociology SC Government & Law; Sociology GA ML223 UT WOS:A1993ML22300012 ER PT J AU QUIRRENBACH, A ELIAS, NM MOZURKEWICH, D ARMSTRONG, JT BUSCHER, DF HUMMEL, CA AF QUIRRENBACH, A ELIAS, NM MOZURKEWICH, D ARMSTRONG, JT BUSCHER, DF HUMMEL, CA TI OBSERVATIONS OF NOVA CYGNI 1992 WITH A LONG-BASE-LINE OPTICAL INTERFEROMETER SO ASTRONOMICAL JOURNAL LA English DT Article ID DISTANCE SCALE AB Nova Cygni 1992 was observed with the MkIII optical interferometer on several nights in 1992 February; usable data were obtained on February 28 and 29. This marks the first time that a nova has been resolved approximately 10 days after maximum light. A uniform disk model fitted to the data in three wide-band (approximately 25 nm) filters gives a diameter of 3.8 mas. The uniform disk diameter in a 10-nm bandpass centered on the Halpha line was 5.1 mas. From this number, and adopting an expansion velocity of approximately 1100 km s-1, the distance to the nova is estimated to be approximately 2.5 kpc. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. UNIV WASHINGTON,SPACE RES ASSOC,WASHINGTON,DC 20024. RP QUIRRENBACH, A (reprint author), USN OBSERV,OPT INTERFEROMETER PROJECT,NRL,CODE AD5,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 16 TC 26 Z9 26 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 SEP PY 1993 VL 106 IS 3 BP 1118 EP 1122 DI 10.1086/116710 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LU943 UT WOS:A1993LU94300023 ER PT J AU FELDMAN, U WIDING, KG AF FELDMAN, U WIDING, KG TI ELEMENTAL ABUNDANCES IN THE UPPER SOLAR ATMOSPHERE OF QUIET AND CORONAL HOLE REGIONS (TE APPROXIMATE-TO 4.3 X 10(5) K) SO ASTROPHYSICAL JOURNAL LA English DT Article DE SOLAR WIND; SUN, ABUNDANCES; SUN, CORONA ID RECURRENT GEOMAGNETIC DISTURBANCES; UNRESOLVED FINE-STRUCTURES; B-LIKE IONS; PHOTOSPHERIC ABUNDANCES; TEMPERATURE REGION; WIND; EMISSION; OXYGEN; NEON; SPECTROGRAPH AB Detailed examination of the Sun's upper atmosphere reveals that elemental abundances vary between different solar regions. Some solar regions exhibit the well-established photospheric abundances, while in other regions the abundances of some elements diverge from photospheric by an order of magnitude, and perhaps even more. Elemental abundances in the solar wind (SW) are also different from elemental abundances in the photosphere. It is postulated that elemental abundances in the SW reflect the elemental abundances of their place of origin near the solar surface. The solar surface is covered, predominantly, by quiet and coronal hole regions. In this paper we measure the intensities of limb-brightening rings over quiet and coronal hole regions in lines of Mg VI and Ne VI (T(e) almost-equal-to 4.3 x 10(5) K) and determine the relative elemental abundances of the features producing the rings. The rings are formed by a plasma component occupying only a small fraction of the immediate volume above the solar surface. Since the brightness of the plasma occupying the rest of the volume is much smaller, it is not discussed in this paper. The findings are correlated with elemental abundances in the SW. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 36 TC 50 Z9 50 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1993 VL 414 IS 1 BP 381 EP 388 DI 10.1086/173084 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LU114 UT WOS:A1993LU11400034 ER PT J AU GREENHOUSE, MA FELDMAN, U SMITH, HA KLAPISCH, M BHATIA, AK BARSHALOM, A AF GREENHOUSE, MA FELDMAN, U SMITH, HA KLAPISCH, M BHATIA, AK BARSHALOM, A TI INFRARED CORONAL EMISSION-LINES AND THE POSSIBILITY OF THEIR LASER-EMISSION IN SEYFERT NUCLEI SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE ATOMIC PROCESSES; GALAXIES, NUCLEI; GALAXIES, SEYFERT; INFRARED, GALAXIES; LINE, FORMATION; MASERS ID ACTIVE GALACTIC NUCLEI; X-RAY-SPECTRUM; CLASSICAL NOVAE; FORBIDDEN LINES; IONIZATION; GALAXIES; PROFILES; ELEMENTS; NGC-1068; PROGRAM AB Infrared coronal emission lines are providing a new window for observation and analysis of highly ionized gas in such Galactic and extragalactic sources as Seyfert nuclei and classical novae shells. These lines are expected to be primary coolants in colliding galaxies, galaxy cluster cooling flows, cometary-compact H II regions, and supernova remnants. In this paper, we compile a complete list of infrared (lambda > 1 mum) lines due to transitions within the ground configurations 2s(2)2p(k) and 3s(2)3p(k) (k = 1-5) or the first excited configurations 2s2p and 3s3p of highly ionized (chi greater-than-or-equal-to 100 eV) astrophysically abundant [n(X)/n(H) greater-than-or-equal-to 10(-6)]elements. Included are approximately 74 lines in ions of O, Ne, Na, Mg, Al, Si, S, Ar, Ca, Fe, and Ni spanning a wavelength range of approximately 1-280 mum. We present results from detailed balance calculations, critical densities for collisional deexcitation, intrinsic photon rates, branching ratios, and excitation temperatures for the majority of the compiled transitions. The temperature and density parameter space for dominant cooling via infrared coronal lines is presented, and the relationship of infrared and optical coronal lines is discussed. We find that under physical conditions found in Seyfert nuclei, 14 of 70 transitions examined have significant population inversions in levels that give rise to infrared coronal lines. Laser gain lengths and corresponding column densities are calculated for dense [10(6) less-than-or-equal-to n(e) (cm-3) less-than-or-equal-to 10(9)] collisionally ionized plasmas. Application of these results to cooler plasmas photoionized by power-law continuum radiation fields is also discussed. We find that several infrared coronal line transitions have laser gain lengths that correspond to column densities of 10(24-25) cm-2 which are modeled to exist in Seyfert nuclei. Observations that can reveal inverted level populations and laser gain in infrared coronal lines are also suggested. C1 NUCL RES CTR NEGEV,BEER SHEVA,ISRAEL. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. USN,RES LAB,SOLAR TERR RELAT BRANCH,WASHINGTON,DC 20375. USN,RES LAB,ARTEP INC,WASHINGTON,DC 20375. RP GREENHOUSE, MA (reprint author), SMITHSONIAN INST,NATL AIR & SPACE MUSEUM,ASTROPHYS LAB,WASHINGTON,DC 20560, USA. NR 63 TC 35 Z9 35 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 SEP PY 1993 VL 88 IS 1 BP 23 EP 48 DI 10.1086/191813 PG 26 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LU110 UT WOS:A1993LU11000002 ER PT J AU ALBERT, CE BLADES, JC MORTON, DC LOCKMAN, FJ PROULX, M FERRARESE, L AF ALBERT, CE BLADES, JC MORTON, DC LOCKMAN, FJ PROULX, M FERRARESE, L TI A HIGH-RESOLUTION OPTICAL AND RADIO STUDY OF MILKY-WAY HALO GAS SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE GALAXY, HALO; ISM, ABUNDANCES; RADIO LINES, ISM ID INTERSTELLAR ABSORPTION-LINES; HIGH GALACTIC LATITUDES; CA-II ABSORPTION; EARLY-TYPE STARS; OB-STARS; NA-I; H-I; B-STARS; PHOTOMETRY; VELOCITY AB Optical interstellar absorption lines of Ti II and Ca II and the 21 cm emission line of H I have been observed at high-resolution (6 and 1 km s-1, respectively) and high detection sensitivity along 25 lines of sight in the Galactic halo. The sample includes 16 distant halo stars matched with one or more nearly aligned foreground stars as well as local stars along five extragalactic sight lines. The data show substantial interstellar material, at both low and intermediate velocities, between 250 and 1000 pc beyond the Galactic plane. As much as one-third of the total gas observed in Ca II absorption may be beyond 1 kpc, and the gaseous Ti II may lie in an even thicker layer. The directly determined gaseous titanium abundance above the Galactic plane exceeds that in the disk, on the average, by a factor of 4 to 6 and, for individual cloud components, is further enhanced at higher LSR velocity. Thirty-three discrete high-latitude clouds, with well-determined distance limits, are detected in Ca ii absorption and 17 discrete clouds, including three high-velocity clouds, are identified in H I emission. The kinematics of the high-latitude gas observed in Ti II and Ca II absorption is characterized by significant peculiar velocities with respect to a model corotating halo. C1 HERZBERG INST ASTROPHYS,OTTAWA K1A 0R6,ON,CANADA. NATL RADIO ASTRON OBSERV,CHARLOTTESVILLE,VA 22903. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. RP ALBERT, CE (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 86 TC 74 Z9 74 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 SEP PY 1993 VL 88 IS 1 BP 81 EP 117 DI 10.1086/191816 PG 37 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LU110 UT WOS:A1993LU11000005 ER PT J AU Alapaty, K Madala, RV Raman, S AF Alapaty, K. Madala, R. V. Raman, S. TI Sensitivity of monsoon rainfall predictions to initialization procedures SO ATMOSPHERIC RESEARCH LA English DT Article AB Prediction of orographic-convective rainfall during an active monsoon period is studied with an adiabatic and a diabatic vertical mode initialization schemes. A nested grid mesoscale model is used to perform two numerical simulations. In the diabatic initialization scheme, vertical distribution of latent heat released in convective clouds is obtained using the Kuo scheme from analyzed rainfall rates. Results indicate that the model predicted significantly higher rainfall rates when the initial conditions are obtained using a diabatic initialization scheme. Also, predicted rainfall rates are persistently higher almost throughout the period of simulation with a considerable increase during the first nine hours of integration when initial conditions are obtained from a diabatic initialization scheme. Use of diabatic initialization scheme lead to the prediction of stronger winds, stronger circulation patterns associated with the cumulus convection and higher latent heat fluxes from surrounding oceans, leading to higher rainfall rates. C1 [Alapaty, K.; Raman, S.] N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Raleigh, NC 27695 USA. [Madala, R. V.] USN, Res Lab, Washington, DC 20375 USA. RP Alapaty, K (reprint author), N Carolina State Univ, Dept Marine Earth & Atmospher Sci, Box 8208, Raleigh, NC 27695 USA. FU Naval Research Laboratory, Washington, D.C.; Division of International Programs, National Science Foundation [INT-9008926] FX This work was supported in part by the Naval Research Laboratory, Washington, D.C. and in part by the Division of International Programs, National Science Foundation under the grant INT-9008926. Computer resources were provided by the North Carolina Supercomputing Center, Research Triangle Park, NC. NR 11 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0169-8095 J9 ATMOS RES JI Atmos. Res. PD SEP PY 1993 VL 30 IS 2-3 BP 157 EP 170 DI 10.1016/0169-8095(93)90047-R PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA V26DF UT WOS:000208525600006 ER PT J AU SEELY, JF BARSHALOM, A AF SEELY, JF BARSHALOM, A TI WAVELENGTHS AND ENERGY-LEVELS FOR THE ZN-I ISOELECTRONIC SEQUENCE GA1+ THROUGH XE24+ SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Article ID ZINC-LIKE IONS; N = 4; KR-VII; TRANSITION-PROBABILITIES; LIFETIME MEASUREMENTS; SPECTRA C1 NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. RP SEELY, JF (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7674,WASHINGTON,DC 20375, USA. NR 15 TC 5 Z9 5 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 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD SEP PY 1993 VL 55 IS 1 BP 143 EP 155 DI 10.1006/adnd.1993.1018 PG 13 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA MD955 UT WOS:A1993MD95500005 ER PT J AU WILLIAMS, TA GOLDEN, MJH VOIGT, C KLAISS, H AF WILLIAMS, TA GOLDEN, MJH VOIGT, C KLAISS, H TI SOLAR PROCESS HEAT-GENERATION BY PARABOLIC CHANNEL PLANT SO BRENNSTOFF-WARME-KRAFT LA German DT Article AB The authors present a solar-thermal parabolic channel plant, installed at Tehachapi (California), which provides a prison with process and industrial water in fuel-saving operation. The plant design. its performance data and operational results are described. The cost-effectiveness of the plant is considered, which is secured for the operator by a long-term utilization agreement (30 years). C1 DLR,INST TECH THERMODYNAM,STUTTGART,GERMANY. RP WILLIAMS, TA (reprint author), NRL,NATL RENEWABLE ENERGY LAB,GOLDEN,CA, USA. NR 6 TC 3 Z9 3 U1 0 U2 1 PU V D I VERLAG GMBH PI DUSSELDORF 1 PA VERLAG VEREINS DTSCH ING, POSTFACH 8228, HEINRICHSTRASSE 24, W-4000 DUSSELDORF 1, GERMANY SN 0006-9612 J9 BRENNST-WARME-KRAFT JI Brennst.-Warme-Kraft PD SEP PY 1993 VL 45 IS 9 BP 412 EP 415 PG 4 WC Thermodynamics; Energy & Fuels; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA LZ064 UT WOS:A1993LZ06400006 ER PT J AU SMITH, DR SNOW, JT AF SMITH, DR SNOW, JT TI THE 2ND AMS SYMPOSIUM ON EDUCATION SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Editorial Material ID INITIATIVES C1 PURDUE UNIV,DEPT EARTH & ATMOSPHER SCI,W LAFAYETTE,IN 47907. RP SMITH, DR (reprint author), USN ACAD,DEPT OCEANOG,ANNAPOLIS,MD 21402, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 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 SEP PY 1993 VL 74 IS 9 BP 1714 EP 1719 PG 6 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LY463 UT WOS:A1993LY46300006 ER PT J AU NAKOS, G AF NAKOS, G TI ON IDEALS ANNIHILATING THE TORAL CLASS OF BP(ASTERISK)((BZ/P(K))(N)) SO CANADIAN MATHEMATICAL BULLETIN-BULLETIN CANADIEN DE MATHEMATIQUES LA English DT Article ID BROWN-PETERSON HOMOLOGY AB A sequence of ideals I(k,n) subset-or-equal-to BP* is introduced, with the property: I(k,n) subset-or-equal-to Ann(gamma(k,n)), where gamma(k,n) is the toral class of the Brown-Peterson homology of the n-fold product BZ/p(k) X ... X BZ/p(k). These ideals seem to play an interesting and yet unclear role in understanding Ann(gamma(k,n)). They are defined by using the formal group law of the Brown-Peterson spectrum BP, and some of their elementary properties are established. By using classical theorems of Landweber and of Ravenel-Wilson, the author computes the radicals of I(k,n) and Ann(gamma(k,n)), and discusses a few examples. C1 USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. NR 17 TC 4 Z9 4 U1 0 U2 0 PU CANADIAN MATHEMATICAL SOC PI OTTAWA PA 577 KING EDWARD RD, PO BOX 450, STATION A, OTTAWA ON K1N 6N5, CANADA SN 0008-4395 J9 CAN MATH BULL JI Can. Math. Bul.-Bul. Can. Math. PD SEP PY 1993 VL 36 IS 3 BP 332 EP 343 DI 10.4153/CMB-1993-046-6 PG 12 WC Mathematics SC Mathematics GA MJ008 UT WOS:A1993MJ00800010 ER PT J AU BARAL, S BRANDOW, S GABER, BP AF BARAL, S BRANDOW, S GABER, BP TI ELECTROLESS METALLIZATION OF HALLOYSITE, A HOLLOW CYLINDRICAL 1/1 ALUMINOSILICATE OF SUBMICRON DIAMETER SO CHEMISTRY OF MATERIALS LA English DT Article ID DEPOSITION; CATALYSTS AB A new kind of cermet has been produced by electroless metalization of the mineral halloysite. The aluminosilicate particles of approximately 1-mum length and 100-nm diameter were coated with roughly 20-nm-thick microcrystalline nickel film. Electron and atomic force microscopy, thermogravimetry, and electron and X-ray diffraction studies have been used to characterize the original halloysite and the metalized product. Potential applications of these novel cermet particles are delineated. C1 GEO CENTERS INC,FT WASHINGTON,MD 20744. UNIV COLORADO,DEPT CHEM,BOULDER,CO 80309. USN,RES LAB,CTR BIO MOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 40 TC 18 Z9 18 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD SEP PY 1993 VL 5 IS 9 BP 1227 EP 1232 DI 10.1021/cm00033a008 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LY929 UT WOS:A1993LY92900008 ER PT J AU HONEYCHUCK, RV HO, T WYNNE, KJ NISSAN, RA AF HONEYCHUCK, RV HO, T WYNNE, KJ NISSAN, RA TI PREPARATION AND CHARACTERIZATION OF POLYURETHANES BASED ON A SERIES OF FLUORINATED DIOLS SO CHEMISTRY OF MATERIALS LA English DT Article AB This research is part of an effort directed toward obtaining polymers with minimally adhesive surfaces. Fluorinated polyurethanes based on a series of ethylene-fluoroalkyl-ethylene diols and hexamethylene diisocyanate were prepared and characterized to include a preliminary evaluation of surface properties. Polymerization was carried out both in bulk and in tetrahydrofuran solution. Glass transition temperatures of the resulting polymers were ca. 20-degrees-C. Average molecular weights, determined by GPC, were in the range M(w) = (12-54) x 10(3). Mechanical properties were determined using an Instron tester. Young's modulus ranged from 1 to 56 MPa depending on composition and processing history. High strain-at-break values were observed ranging from ca. 900 to 1800 %. A significant decrease in surface free energy from 31.5 to 25.5 erg/cm2 was seen with an increase in the fluorocarbon content from 58 to 64 wt %. C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. USN,CTR WARFARE,CHINA LAKE,CA 93555. NR 19 TC 58 Z9 60 U1 3 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD SEP PY 1993 VL 5 IS 9 BP 1299 EP 1306 DI 10.1021/cm00033a020 PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LY929 UT WOS:A1993LY92900020 ER PT J AU WALLACE, MR SHARP, TW ROMAJZL, PJ BATCHELOR, RA THORNTON, SA LONGER, CF BURANS, JP AF WALLACE, MR SHARP, TW ROMAJZL, PJ BATCHELOR, RA THORNTON, SA LONGER, CF BURANS, JP TI MALARIA IN MOGADISHU, SOMALIA SO CLINICAL INFECTIOUS DISEASES LA English DT Letter ID CHLOROQUINE C1 USN,MED RES INST,BETHESDA,MD 20814. USN,ENVIRONM & PREVENT MED UNIT 7,NAPLES,ITALY. USN,MED RES UNIT 3,CAIRO,EGYPT. WALTER REED ARMY MED RES INST INFECT DIS,WASHINGTON,DC. RP WALLACE, MR (reprint author), USN HOSP,DEPT INFECT DIS,SAN DIEGO,CA 92134, USA. NR 3 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 SEP PY 1993 VL 17 IS 3 BP 510 EP 511 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LW237 UT WOS:A1993LW23700032 PM 8218699 ER PT J AU WEISS, PJ KENNEDY, CA WALLACE, MR NGUYEN, MT OLDFIELD, EC AF WEISS, PJ KENNEDY, CA WALLACE, MR NGUYEN, MT OLDFIELD, EC TI MEDICATION COSTS ASSOCIATED WITH THE CARE OF HIV-INFECTED PATIENTS SO CLINICAL THERAPEUTICS LA English DT Article AB The treatment costs for human immunodeficiency virus (HIV)-infected patients continue to rise as patients survive longer because of advances in antiretroviral therapy and effective chemoprophylaxis. Medication costs per patient increase in proportion to progressive immunodeficiency. We retrospectively studied medication costs for 196 HIV-infected patients with stratification by CD4-lymphocyte count. Medication costs per patient-month were correlated with CD4-lymphocyte count (linear regression, r=-.53, P<0.01), with higher costs associated with lower CD4 counts. The medication cost for patients with CD4 counts <100 cells/mm3 averaged $1043 per month. Medication costs per patient increase with the development of each new opportunistic infection or other AIDS-associated condition. Costs can be expected to increase as new therapeutic agents are introduced, as treatment is initiated at earlier stages of HIV infection, and as more patients survive to the point of severe CD4-lymphocyte depletion. RP WEISS, PJ (reprint author), USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 0 TC 6 Z9 6 U1 0 U2 0 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0149-2918 J9 CLIN THER JI Clin. Ther. PD SEP-OCT PY 1993 VL 15 IS 5 BP 912 EP 916 PG 5 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA MD613 UT WOS:A1993MD61300018 PM 8269459 ER PT J AU ARTIGIANI, R AF ARTIGIANI, R TI A 20TH-CENTURY RENAISSANCE, THE PRICE AND PROMISE OF CULTURAL-CHANGE SO DIOGENES LA English DT Article RP ARTIGIANI, R (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 52 TC 0 Z9 0 U1 0 U2 0 PU BERG BOOKS PI PROVIDENCE PA 165 TABER AVE, PROVIDENCE, RI 02906-3329 SN 0392-1921 J9 DIOGENES JI Diogenes PD FAL PY 1993 IS 163 BP 89 EP 112 PG 24 WC Philosophy SC Philosophy GA NC326 UT WOS:A1993NC32600005 ER PT J AU PANTEV, C ELBERT, T MAKEIG, S HAMPSON, S EULITZ, C HOKE, M AF PANTEV, C ELBERT, T MAKEIG, S HAMPSON, S EULITZ, C HOKE, M TI RELATIONSHIP OF TRANSIENT AND STEADY-STATE AUDITORY-EVOKED FIELDS SO ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY LA English DT Article DE AUDITORY EVOKED FIELDS; STEADY-STATE RESPONSE; GAMMA BAND; MAGNETOENCEPHALOGRAPHY; 40 HZ AUDITORY EVOKED POTENTIAL ID MAGNETIC-FIELDS; TONOTOPIC ORGANIZATION; CORTICAL ORIGIN; HUMAN-BRAIN; CORTEX; LOCALIZATION; POTENTIALS; RESPONSES; STIMULATION AB Transient and steady-state auditory evoked fields (AEFs) to brief tone pips were recorded over the left hemisphere at 7 different stimulus rates (0.125-39 Hz) using a 37-channel biomagnetometer. Previous observations of transient auditory gamma band response (GBR) activity were replicated. Similar rate characteristics and equivalent dipole locations supported the suggestion that the steady-state response (SSR) at about 40 Hz represents the summation of successive overlapping (10 Hz) middle latency responses (MLRs). On the other hand, differences in equivalent dipole locations and habituation effects suggest that the magnetically recorded GBR is a separate phenomenon which occurs primarily at low stimulus rates and is unrelated to either the magnetically recorded MRL or SSR. C1 USN,HLTH RES CTR,SAN DIEGO,CA 92186. RP PANTEV, C (reprint author), UNIV MUNSTER,CTR BIOMAGNETISM,INST EXPTL AUDIOL,KARDINAL GALEN RING 10,W-4400 MUNSTER,GERMANY. RI Elbert, Thomas/C-8556-2009; Eulitz, Carsten/E-1396-2012 NR 35 TC 97 Z9 97 U1 1 U2 2 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0013-4694 J9 ELECTROEN CLIN NEURO JI Electroencephalogr. Clin. Neurophysiol. PD SEP-OCT PY 1993 VL 88 IS 5 BP 389 EP 396 DI 10.1016/0168-5597(93)90015-H PG 8 WC Engineering, Biomedical; Clinical Neurology SC Engineering; Neurosciences & Neurology GA MC725 UT WOS:A1993MC72500005 PM 7691563 ER PT J AU Klafter, J Zumofen, G Shlesinger, MF AF Klafter, J. Zumofen, G. Shlesinger, M. F. TI FRACTAL DESCRIPTION OF ANOMALOUS DIFFUSION IN DYNAMICAL SYSTEMS SO FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY LA English DT Article AB Anomalous diffusion properties are common in a broad spectrum of systems including dynamical systems. In this paper we review an approach based on Levy scale-invariant distributions to describe transport in dynamical systems. We introduce the basic ingredients that make the approach useful in describing anomalous diffusion and demonstrate the applicability in the cases of one-dimensional iterated maps and of the standard map. C1 [Klafter, J.] Tel Aviv Univ, Sch Chem, IL-69978 Tel Aviv, Israel. [Zumofen, G.] ETH, Phys Chem Lab, CH-8092 Zurich, Switzerland. [Shlesinger, M. F.] Off Naval Res, Div Phys, Arlington, VA 22217 USA. RP Klafter, J (reprint author), Tel Aviv Univ, Sch Chem, IL-69978 Tel Aviv, Israel. FU Rechenzentrum der ETH-Zurich FX We thank Prof. K. Dressler for helpful discussions and F. Weber for technical assistance. J. K. thanks the ETH for the hospitality during the time this work was carried out. A grant from the Rechenzentrum der ETH-Zurich is gratefully acknowledged. NR 27 TC 10 Z9 10 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-348X EI 1793-6543 J9 FRACTALS JI Fractals-Complex Geom. Patterns Scaling Nat. Soc. PD SEP PY 1993 VL 1 IS 3 BP 389 EP 404 DI 10.1142/S0218348X93000411 PG 16 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA V18WZ UT WOS:000208036200012 ER PT J AU PACE, MD KALYANARAMAN, B AF PACE, MD KALYANARAMAN, B TI SPIN-TRAPPING OF NITROGEN-DIOXIDE RADICAL FROM PHOTOLYTIC DECOMPOSITION OF NITRAMINES SO FREE RADICAL BIOLOGY AND MEDICINE LA English DT Note DE SPIN TRAPPING; NITROGEN DIOXIDE; PEROXYNITRITE; ESR; FREE RADICALS ID PEROXYNITRITE AB The photochemical (lambda < 400 nm) decomposition of some monocyclic and polycyclic nitramines produces .NO2, which can be detected in the respective nitramine crystals at 77 K by EPR (electron paramagnetic resonance). In solutions of perdeutero-dimethylsulfoxide (DMSO-d6) the .NO2 produced by photolytic decomposition of dissolved nitramines can be spintrapped by the solvent to give a radical having the structure CD3-(SO2)-(NO.)-CD3. In this article, we examine this reaction for two nitramines: cyclotrimethylenetrinitramine (RDX) and hexanitrohexaazaisowurzitane (HNIW), which are energetic materials. The decay of the spin-adduct radical (1) follows first-order kinetics for both nitramines studied, having a rate constant (k) of congruent-to 7.1 x 10(-4) s-1. The net growth in spin concentration of (1) measured from EPR spectra is fitted by a first-order rate equation taking into account the simultaneous competitive decay rate of spin adduct (1). Using the rate data and EPR spin concentration data, the ratio of free .NO2 produced per parent nitramine molecule is estimated as 1:1 for RDX and 4:1 for HNIW. Biological implications of trapping of .NO2 by dimethyl sulfoxide are discussed. C1 MED COLL WISCONSIN,BIOPHYS RES INST,MILWAUKEE,WI 53226. RP PACE, MD (reprint author), USN,RES LAB,CODE 6120,OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. FU NCRR NIH HHS [RR01008]; NHLBI NIH HHS [HL45048] NR 10 TC 14 Z9 14 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0891-5849 J9 FREE RADICAL BIO MED JI Free Radic. Biol. Med. PD SEP PY 1993 VL 15 IS 3 BP 337 EP 342 DI 10.1016/0891-5849(93)90080-E PG 6 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism SC Biochemistry & Molecular Biology; Endocrinology & Metabolism GA LT034 UT WOS:A1993LT03400011 PM 8406133 ER PT J AU ROWE, MM GETTRUST, JF AF ROWE, MM GETTRUST, JF TI FAULTED STRUCTURE OF THE BOTTOM SIMULATING REFLECTOR ON THE BLAKE RIDGE, WESTERN NORTH-ATLANTIC SO GEOLOGY LA English DT Article ID GAS-HYDRATE HORIZONS; METHANE HYDRATE; OUTER RIDGE; ZONE AB High-resolution multichannel seismic data collected from the Blake Ridge in the western North Atlantic by the Naval Research Laboratory's Deep Towed Acoustics/Geophysics System (DTAGS) show that the bottom simulating reflector (BSR) in this area is the reflection from the interface between an approximately 440-m-thick section of hydrate-bearing sediment overlying an approximately 5-m-thick layer of methane gas-rich sediment. The high resolution attainable by the deep-tow seismic system reveals normal-fault offsets of approximately 20 m in the BSR. These growth faults may provide a path for vertical migration of methane initially concentrated beneath the hydrate-bearing sediment, enabling hydrate to form throughout sediment above the BSR. Because the BSR represents a methane gas-methane hydrate phase boundary rather than a lithologic or diagenetic horizon, the observed offset of the BSR itself reflects discontinuities in the pressure-temperature field across the fault zones where they intersect the BSR. RP ROWE, MM (reprint author), NAVAL RES LAB,BAY ST LOUIS,MS 39529, USA. NR 19 TC 21 Z9 28 U1 0 U2 5 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD SEP PY 1993 VL 21 IS 9 BP 833 EP 836 DI 10.1130/0091-7613(1993)021<0833:FSOTBS>2.3.CO;2 PG 4 WC Geology SC Geology GA LW412 UT WOS:A1993LW41200016 ER PT J AU AKATSUKA, T DONETS, M SCAGLIONE, L CHING, WM SHIH, JWK DIBISCEGLIE, AM FEINSTONE, SM AF AKATSUKA, T DONETS, M SCAGLIONE, L CHING, WM SHIH, JWK DIBISCEGLIE, AM FEINSTONE, SM TI B-CELL EPITOPES ON THE HEPATITIS-C VIRUS NUCLEOCAPSID PROTEIN DETERMINED BY HUMAN MONOSPECIFIC ANTIBODIES SO HEPATOLOGY LA English DT Article ID HUMAN MONOCLONAL-ANTIBODIES; EPSTEIN-BARR VIRUS; CHRONIC NON-A; AMINO-ACID; ANTIGENIC DETERMINANTS; PEPTIDE-SYNTHESIS; GENOME; IDENTIFICATION; ORGANIZATION; ENVELOPE AB Four monospecific antibodies against the hepatitis C virus nucleocapsid protein, which was expressed by recombinant baculovirus, were obtained by Epstein-Barr virus transformation of B cells from three patients with chronic hepatitis C virus infection. One of these antibodies was IgG and the other three were IgM. Their specificities were characterized initially by enzyme-linked immunosorbent assay and immunoblotting against hepatitis C virus proteins expressed by six recombinant baculoviruses with different hepatitis C virus sequence insertions. These specificities were confirmed, and their epitopes were more precisely determined with a series of overlapping decapeptides made by solid-phase pin technology. Two antibodies (1F4 and 2G6) reacted with the same peptides located near the amino(N)-terminus of nucleocapsid protein (amino acids 33-50). The third antibody (3B5) recognized the peptide consisting of amino acids 133-142, and the fourth antibody (3B9) was mapped to the carboxy(C)-terminus and reacted with a peptide consisting of amino acids 165-174. This epitope has not previously been reported. Two antibodies, 1F4 and 3B9, which are specific to the N-terminus and C-terminus of nucleocapsid protein, respectively, have been stably produced for more than 6 mo and are being subcloned to establish monoclonality. These antibodies should be useful reagents for the study of hepatitis C virus. C1 US FDA,CTR BIOL EVALUAT & RES,DIV VIROL,HEPATITIS RES LAB,BLDG 29A,ROOM 1D14,BETHESDA,MD 20892. NIDDKD,DEPT TRANSFUS MED CLIN MED,BETHESDA,MD 20892. NIDDKD,LIVER DIS SECT,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20814. NR 33 TC 23 Z9 23 U1 0 U2 3 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0270-9139 J9 HEPATOLOGY JI Hepatology PD SEP PY 1993 VL 18 IS 3 BP 503 EP 510 DI 10.1016/0270-9139(93)90348-Q PG 8 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA LV018 UT WOS:A1993LV01800005 PM 7689529 ER PT J AU ZALESKI, A IOANNOU, DE CAMPISI, GJ HUGHES, HL AF ZALESKI, A IOANNOU, DE CAMPISI, GJ HUGHES, HL TI SUCCESSIVE CHARGING DISCHARGING OF GATE OXIDES IN SOI MOSFETS BY SEQUENTIAL HOT-ELECTRON STRESSING OF FRONT BACK CHANNEL SO IEEE ELECTRON DEVICE LETTERS LA English DT Article ID DEGRADATION AB Hot-hole injection into the opposite channel of SOI MOSFET's under hot-electron stress is reported. Sequential front/back-channel hot-electron stressing results in successive hot-electron/hole injection, causing the threshold voltage to increase and decrease accordingly. This ability to inject hot holes into the opposite gate oxide can be used as an additional tool for studying the degradation mechanisms. Furthermore, it may be explored for possible use in designing SOI flash memory cells with back-channel-based erasing schemes. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ZALESKI, A (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 14 TC 9 Z9 9 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 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD SEP PY 1993 VL 14 IS 9 BP 435 EP 437 DI 10.1109/55.244715 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA LU166 UT WOS:A1993LU16600004 ER PT J AU RIDGWAY, SH CARDER, DA AF RIDGWAY, SH CARDER, DA TI FEATURES OF DOLPHIN SKIN WITH POTENTIAL HYDRODYNAMIC IMPORTANCE SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Article C1 USN,CTR COMAND CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,BIOL SCI BRANCH,SAN DIEGO,CA 92152. RP RIDGWAY, SH (reprint author), USN,CTR COMAND CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,DIV BIOSCI,SAN DIEGO,CA 92152, USA. NR 26 TC 18 Z9 21 U1 1 U2 10 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 SEP PY 1993 VL 12 IS 3 BP 83 EP 88 DI 10.1109/51.232347 PG 6 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA LX094 UT WOS:A1993LX09400015 ER PT J AU KROWNE, CM AF KROWNE, CM TI ELECTROMAGNETIC PROPERTIES OF NONRECIPROCAL COMPOSITE CHIRAL-FERRITE MEDIA SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID LINE AB The theoretical properties of a composite chiral-ferrite medium are developed. The composite is constructed from a general chiral medium and a nonreciprocal ferrite medium. Application of the reaction theorem allows proof of nonreciprocity based on the constitutive relationships. Vector Helmholtz E-and H-field equations are derived, and from these equations reciprocal space Green's function dyadics are found. The direct space dyadics are then determined. Characteristic dispersion equations are found from the sourceless vector phasor Helmholtz equations. E-field polarization is obtained by projecting the E field vector onto the polarization plane selected. Diagonalization of the elliptic equation through coordinate rotation allows major and minor axis determination. RP KROWNE, CM (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,MICROWAVE TECHNOL BRANCH,WASHINGTON,DC 20375, USA. NR 14 TC 28 Z9 28 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 SEP PY 1993 VL 41 IS 9 BP 1289 EP 1295 DI 10.1109/8.247756 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA ML419 UT WOS:A1993ML41900014 ER PT J AU ABRAHAMS, J LIPMAN, MJ AF ABRAHAMS, J LIPMAN, MJ TI RELATIVE UNIFORMITY OF SOURCES AND THE COMPARISON OF OPTIMAL CODE COSTS SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Letter DE HUFFMAN CODE; SHANNON ENTROPY; RENYI ENTROPY; UNIFORM SOURCE AB Conditions on the probability distributions of two sources that describe their relative uniformity are shown to be sufficient for inequalities on their minimum average codeword lengths and entropies. The Huffman coding problem and variants involving Renyi entropy are addressed. RP ABRAHAMS, J (reprint author), OFF NAVAL RES,DIV MATH SCI,ARLINGTON,VA 22217, USA. NR 7 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 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD SEP PY 1993 VL 39 IS 5 BP 1695 EP 1697 DI 10.1109/18.259659 PG 3 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA MT275 UT WOS:A1993MT27500024 ER PT J AU RUEGER, LJ NORTON, JR LASEWICZ, PT AF RUEGER, LJ NORTON, JR LASEWICZ, PT TI LONG-TERM PERFORMANCE OF PRECISION CRYSTAL-OSCILLATORS IN A NEAR-EARTH ORBITAL ENVIRONMENT SO IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL LA English DT Article AB The Navy Navigation Satellite System (NNSS) uses precision quartz crystal oscillators to provide time and frequency in the orbiting spacecraft. The frequency changes for multiple oscillators, which were observed for 28 years of operational service in the orbital environment, are discussed in this paper. The primary frequency changes are believed to be caused by mass transfer to and from the resonator, stress relief in the resonator mounting structure and electrodes, and ionizing radiation of the quartz resonator [1]. Observations to a resolution of 10(-13) have been made from 1963 to 1991 on 20 operational satellites in near-Earth orbit. No oscillator failures have occurred during the entire program life of nearly 30 years. One oscillator provided continuous operational service for over 21 years, and several have served more than 15 years. No oscillator changed frequency more than two parts in 10(7) while in operational service. One of the best performing oscillators had a predictable drift rate of 9 X 10(-13) +/- 1 X 10(-13) per day after three years of service. C1 JOHNS HOPKINS UNIV,DEPT SPACE,APPL PHYS LAB,LAUREL,MD 20723. USN,CTR SATELLITE OPERAT,DIV SATELLITE & LAUNCH,OPERAT ANAL GRP,POINT MUGU,CA 93042. USN,CTR SATELLITE OPERAT,DIV SATELLITE MANAGEMENT,POINT MUGU,CA 93042. RP RUEGER, LJ (reprint author), BENDIX FIELD ENGN CORP,COLUMBIA,MD 21045, USA. NR 4 TC 6 Z9 6 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 0885-3010 J9 IEEE T ULTRASON FERR JI IEEE Trans. Ultrason. Ferroelectr. Freq. Control PD SEP PY 1993 VL 40 IS 5 BP 528 EP 531 DI 10.1109/58.238105 PG 4 WC Acoustics; Engineering, Electrical & Electronic SC Acoustics; Engineering GA MA444 UT WOS:A1993MA44400013 PM 18263216 ER PT J AU THOMAS, JP AF THOMAS, JP TI A CLASSICAL REPRESENTATION FOR A MASS BASED CHEMICAL-POTENTIAL SO INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE LA English DT Article ID CONSTANT VOLUME CONDITIONS; MIXTURES; PRESSURE AB The objective of this work was to obain an explicit functional representation for the chemical potential of ideal and mildly non-ideal constituents of a mixture when mass fraction concentrations are used as the composition variables. A mass based chemical potential is needed in the application of certain continuum mixture theories to the modeling of mixtures that are strongly coupled in the mechanical and chemical field variables. The objective has been achieved by converting the classical logarithmic chemical potential for molar compositions into an equivalent mass based relationship. A polynomial expansion in mass fraction concentrations is written for the activity coefficient of mildly non-ideal constituents, and the coefficients of the polynomial are simplified by requiring the new potential to satisfy an appropriate set of Maxwell reciprocity and Gibbs-Duhem relationships. Some approximations for the mass based potential and its spatial gradient are also obtained for varying degrees of diluteness. RP THOMAS, JP (reprint author), USN,RES LAB,MECH MAT BRANCH,CODE 6382,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 23 TC 3 Z9 3 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7225 J9 INT J ENG SCI JI Int. J. Eng. Sci. PD SEP PY 1993 VL 31 IS 9 BP 1279 EP 1294 DI 10.1016/0020-7225(93)90132-E PG 16 WC Engineering, Multidisciplinary SC Engineering GA LK674 UT WOS:A1993LK67400006 ER PT J AU GULEVICH, SJ MCCUTCHAN, JA THAL, LJ KIRSON, D DURAND, D WALLACE, M MEHTA, P GRANT, I AF GULEVICH, SJ MCCUTCHAN, JA THAL, LJ KIRSON, D DURAND, D WALLACE, M MEHTA, P GRANT, I TI EFFECT OF ANTIRETROVIRAL THERAPY ON THE CEREBROSPINAL-FLUID OF PATIENTS SEROPOSITIVE FOR THE HUMAN-IMMUNODEFICIENCY-VIRUS SO JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES AND HUMAN RETROVIROLOGY LA English DT Article DE CSF; HIV; ZIDOVUDINE; BETA-2-MICROGLOBULIN; NEOPTERIN ID QUINOLINIC ACID CONCENTRATIONS; AIDS DEMENTIA COMPLEX; ZIDOVUDINE TREATMENT; CONTROLLED TRIAL; INFECTION; BETA-2-MICROGLOBULIN; NEOPTERIN; BRAIN; BLOOD AB Elevated levels of beta2-microglobulin and neopterin in cerebrospinal fluid (CSF) have been associated with neurologic complications of infection with the human immunodeficiency virus (HIV). The effect of zidovudine (ZDV) on these markers was assessed by studying the effect of ZDV treatment duration on CSF levels in a cohort of 145 HIV-positive men who were receiving ZDV. CSF beta2-microglobulin and neopterin levels were significantly lower in those who had been taking ZDV for an intermediate period of time (46-365 days) than in those who had received ZDV either long term (>365 days) or short term (1-45 days). CSF quinolinic acid levels were independent of duration of ZDV administration. A second CSF evaluation was available after 1 year for 54 HIV-positive men (19 of whom were also in the first cohort) and 11 HIV-negative controls. Patients who had started ZDV between lumbar punctures showed a significant decrease in CSF beta2-microglobulin, but in those who had been receiving ZDV for >1 year beta2-microglobulin increased (p = 0.001). The effect was not observed with neopterin (p = 0. 14). (Quinolinic acid levels were not studied longitudinally.) Finally, we observed that CSF levels of beta2-microblobulin, neopterin, and quinolinic acid correlated strongly with each other in HIV-positive individuals (r = 0.7, p < 0.0001), even though ZDV might have different effects on these markers. In conclusion, we report that initiation of ZDV therapy is associated with a transient decrease in CSF levels of beta2-microglobulin and neopterin. This pattern is consistent with the reported short-term benefit of ZDV treatment on HIV infection in the nervous system. C1 UNIV CALIF SAN DIEGO,SCH MED,VET ADM MED CTR,DEPT NEUROSCI,2760 5TH AVE,SUITE 200,SAN DIEGO,CA 92103. UNIV CALIF SAN DIEGO,SCH MED,VET ADM MED CTR,DEPT MED,SAN DIEGO,CA 92103. UNIV CALIF SAN DIEGO,SCH MED,VET ADM MED CTR,DEPT PSYCHIAT,SAN DIEGO,CA 92103. USN HOSP,SAN DIEGO,CA 92134. FU NIMH NIH HHS [5 R01 MH43298, R01 MH45688, NIMH 5 P50 MH45294] NR 23 TC 11 Z9 11 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 1077-9450 J9 J ACQ IMMUN DEF SYND JI J. Acquir. Immune Defic. Syndr. Hum. Retrovirol. PD SEP PY 1993 VL 6 IS 9 BP 1002 EP 1007 PG 6 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA MC828 UT WOS:A1993MC82800005 PM 8101873 ER PT J AU HORNBECK, CL CARRIG, JE CZARNY, RJ AF HORNBECK, CL CARRIG, JE CZARNY, RJ TI DETECTION OF A GC MS ARTIFACT PEAK AS METHAMPHETAMINE SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID AMPHETAMINE; DERIVATIZATION; QUANTITATION; URINE; GC/MS RP HORNBECK, CL (reprint author), USN,DRUG SCREENING LAB,SAN DIEGO,CA 92134, USA. NR 7 TC 33 Z9 33 U1 1 U2 2 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD SEP PY 1993 VL 17 IS 5 BP 257 EP 263 PG 7 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA LU221 UT WOS:A1993LU22100001 PM 8107458 ER PT J AU JENKINS, AJ MILLS, LC DARWIN, WD HUESTIS, MA CONE, EJ MITCHELL, JM AF JENKINS, AJ MILLS, LC DARWIN, WD HUESTIS, MA CONE, EJ MITCHELL, JM TI VALIDITY TESTING OF THE EZ-SCREEN(R) CANNABINOID TEST SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID METABOLITE C1 NIDA,ADDICT RES CTR,POB 5180,BALTIMORE,MD 21224. USN,DRUG SCREENING LAB,NAVAL AIR STN,JACKSONVILLE,FL 32212. NR 15 TC 11 Z9 11 U1 0 U2 1 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD SEP PY 1993 VL 17 IS 5 BP 292 EP 298 PG 7 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA LU221 UT WOS:A1993LU22100007 PM 8107464 ER PT J AU THOMPSON, WT BURK, SD AF THOMPSON, WT BURK, SD TI POSTFRONTAL BOUNDARY-LAYER MODIFICATION OVER THE WESTERN GULF-OF-MEXICO DURING GUFMEX SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID COLD-AIR OUTBREAKS; MASS TRANSFORMATION MODEL; RETURN-FLOW; EVOLUTION AB Cold-frontal passages over the Gulf of Mexico in late winter or early spring are frequently followed by return-flow episodes in which modified polar air and warm, moist tropical air move toward the Gulf coast. While both advection and airmass modification due to boundary-layer physics are important in this sequence of events, the relative roles of these processes are unclear. In the present study, the authors utilize data from the Gulf of Mexico Experiment and two distinctive numerical models in addressing this issue. In forecasts of a return-flow event, trajectory computations are performed using a mesoscale numerical weather prediction model to determine the source regions of air arriving on the coast at several different levels. A one-dimensional airmass transformation model is also used in order to delineate boundary-layer physical processes. Simulations were conducted at two sites along the Gulf coast to investigate geographic variability in this return-flow episode, including the effect on boundary-layer structure of sea surface temperature variations in shelf waters. By careful examination of temporal variations in surface flux and advective forcing and by examining changes due both to surface heat flux and differential advection in the forecast vertical profiles of potential temperature and specific humidity, the authors demonstrate that surface fluxes are important in heating and moistening the boundary layer as the air moves south across the Gulf. In the return flow, the complex vertical structure of differential advective heating and drying from multiple source regions plays an important role as well. RP USN RES LAB, MONTEREY, CA 93943 USA. NR 22 TC 6 Z9 6 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD SEP PY 1993 VL 32 IS 9 BP 1521 EP 1537 DI 10.1175/1520-0450(1993)032<1521:PBLMOT>2.0.CO;2 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LV181 UT WOS:A1993LV18100006 ER PT J AU SAMADDAR, SN AF SAMADDAR, SN TI BEHAVIOR OF THE ENERGY DENSITY IN THE FRESNEL REGION OF A CONDUCTING CIRCULAR DISK EXCITED BY SINGLE-CYCLE SINUSOIDS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TRANSMISSION AB By comparing the radiated energy densities in the Fresnel's region due to excitations by a cw (continuous wave) sin omega0t and a single-cycle sin omega0t, it is shown that the single-cycle pulse is more efficient in collimating (or focusing) the energy in the vicinity of the disk axis. We have also considered a single-cycle cos omega0t pulse as an exciting source, which may be more academic than realistic. Nonetheless, the results shed some light in showing clearly that the shorter the rise time of a pulse, the slower is the decay of the radiated energy, and hence, it is highly efficient in focusing the energy in front of the radiating device. It follows then that whenever the transmission of a collimated beam of energy to a large distance along the axis of the radiating aperture is desired, it can be accomplished more efficiently by using a short pulse, instead of a cw source. RP SAMADDAR, SN (reprint author), USN,RES LAB,DIV RADAR,RADAR ANAL BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 8 Z9 8 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 SEP 1 PY 1993 VL 74 IS 5 BP 3013 EP 3023 DI 10.1063/1.354617 PG 11 WC Physics, Applied SC Physics GA LV391 UT WOS:A1993LV39100003 ER PT J AU MOLNAR, B KENNEDY, TA GLASER, ER DIETRICH, HB AF MOLNAR, B KENNEDY, TA GLASER, ER DIETRICH, HB TI OBSERVATION OF ION-IMPLANTATION-DAMAGE-CREATED N-TYPE CONDUCTIVITY IN INP AFTER HIGH-TEMPERATURE ANNEALING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SEMI-INSULATING INP; INDIUM-PHOSPHIDE; PROTON-BOMBARDMENT; REDISTRIBUTION; CHROMIUM; MODES; IRON AB The conductivity and the impurity profiles of InP implanted with dopant ions (Si,Be) or non dopant ions (B,H,N,O,P) have been investigated. Experiments have been done in substrates with and without Fe doping. Low-temperature, short-time annealing of implanted Si and Be reveals an n-type distribution of carriers which cannot be accounted for on the basis of implant activation. In order to examine the contribution without the carriers originating from the dopant ions, the behavior of electrically inactive B, H, N, O, and P, implants was investigated. Implantation of these ions into semi-insulating InP introduced n-type doping in the 1 X 10(16) cm3 range after an anneal above 450-degrees-C. For H, O, N, and P ions, the n-type conductivity could be eliminated by annealing at higher temperatures. However, boron anneals up to 750-degrees-C did not eliminate the n-type conductivity. The n-type carrier profiles tracked the ion profiles. The carrier profile is influenced by the redistribution of the Fe during annealing; however, the Fe motion cannot explain the n-type conductivity. This conductivity may be due to a complex formed above 450-degrees-C. RP MOLNAR, B (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 1 PY 1993 VL 74 IS 5 BP 3091 EP 3098 DI 10.1063/1.354574 PG 8 WC Physics, Applied SC Physics GA LV391 UT WOS:A1993LV39100014 ER PT J AU SAKS, NS AF SAKS, NS TI COMPARISON OF INTERFACE-TRAP DENSITIES MEASURED BY THE JENQ AND CHARGE-PUMPING TECHNIQUES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID STATE GENERATION; SI-SIO2 INTERFACE; MOS CAPACITORS; HOLES; TRANSISTORS; DEFECTS AB The validity of the Jenq technique for measuring the average density of interface traps D(it) in metal-oxide-semiconductor devices at cryogenic temperatures (78 K) is assessed. D(it) has been determined using both the Jenq technique, which is based on measurement of hysteresis in high-frequency capacitance-voltage data, and the more standard charge pumping technique. Excellent agreement (+/- 10%) is found between the two techniques for a wide range of D(it) values from 5 X 10(10) to 1 X 10(12) traps/cm2 eV. RP SAKS, NS (reprint author), USN,RES LAB,CODE 6813,WASHINGTON,DC 20375, USA. NR 22 TC 2 Z9 2 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 SEP 1 PY 1993 VL 74 IS 5 BP 3303 EP 3306 DI 10.1063/1.354553 PG 4 WC Physics, Applied SC Physics GA LV391 UT WOS:A1993LV39100049 ER PT J AU COVEY, DC SAPEGA, AA AF COVEY, DC SAPEGA, AA TI CURRENT CONCEPTS REVIEW - INJURIES OF THE POSTERIOR CRUCIATE LIGAMENT SO JOURNAL OF BONE AND JOINT SURGERY-AMERICAN VOLUME LA English DT Review ID KNEE-JOINT; OPERATIVE TREATMENT; ACUTE TEARS; RECONSTRUCTION; MODEL; PCL; INSTABILITY; ANTERIOR; LENGTH; INSUFFICIENCY C1 UNIV PENN,SCH MED,CTR SPORTS MED,PHILADELPHIA,PA 19104. RP COVEY, DC (reprint author), USN HOSP,DEPT ORTHOPAED SURG,BOONE RD,BREMERTON,WA 98312, USA. NR 115 TC 65 Z9 66 U1 2 U2 6 PU JOURNAL BONE JOINT SURGERY INC PI NEEDHAM PA 20 PICKERING ST, NEEDHAM, MA 02192 SN 0021-9355 J9 J BONE JOINT SURG AM JI J. Bone Joint Surg.-Am. Vol. PD SEP PY 1993 VL 75A IS 9 BP 1376 EP 1386 PG 11 WC Orthopedics; Surgery SC Orthopedics; Surgery GA MA592 UT WOS:A1993MA59200014 ER PT J AU LOCK, H WIND, RA MACIEL, GE JOHNSON, CE AF LOCK, H WIND, RA MACIEL, GE JOHNSON, CE TI A STUDY OF C-13-ENRICHED CHEMICAL-VAPOR-DEPOSITED DIAMOND FILM BY MEANS OF C-13 NUCLEAR-MAGNETIC-RESONANCE, ELECTRON-PARAMAGNETIC-RESONANCE, AND DYNAMIC NUCLEAR-POLARIZATION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SOLIDS; NMR; SPECTROSCOPY; GROWTH AB C-13 nuclear magnetic resonance (NMR), with and without dynamic nuclear polarization (DNP), and electron paramagnetic resonance (EPR) measurements are presented on two C-13-enriched chemical vapor deposited (CVD) diamond films. The samples were prepared by the decomposition in a microwave discharge of a gas mixture of CH4 and H-2, with and without O2. C-13 NMR spectra, obtained with or without magic-angle spinning (MAS) both at a field of 14 T using direct polarization (DP) and at 3.5 T via cross polarization (CP), are presented. Because the samples contain both nuclear and (unpaired) electron spins, irradiation of the sample with microwaves with a frequency at or near the electron Larmor frequency leads to an enhancement of the nuclear spin polarization via the effect referred to as dynamic nuclear polarization (DNP). This enhancement (at a field of 1.4 T), combined with the effects of isotopic enrichment (14% C-13), makes it possible to measure C-13 DNP-CP-MAS spectra within a couple of hours, compared to almost 20 h for the CP-MAS spectra taken at high field without DNP. Data based on DNP-CP-MAS experiments with variable CP-match time or dipolar-dephasing time are shown and discussed in terms of structural models. The cross-polarization signals are rationalized in terms of estimates of the chemical shifts of hydrogenated diamond surfaces; this approach indicates that most of the hydrogens in the polycrystalline sample are at the intergrain boundaries. C1 COLORADO STATE UNIV,DEPT CHEM,FT COLLINS,CO 80523. USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 28 TC 19 Z9 19 U1 3 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1993 VL 99 IS 5 BP 3363 EP 3379 DI 10.1063/1.465146 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LU722 UT WOS:A1993LU72200025 ER PT J AU BOHMER, R NGAI, KL ANGELL, CA PLAZEK, DJ AF BOHMER, R NGAI, KL ANGELL, CA PLAZEK, DJ TI NONEXPONENTIAL RELAXATIONS IN STRONG AND FRAGILE GLASS FORMERS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Review ID DYNAMIC LIGHT-SCATTERING; COOPERATIVELY REARRANGING REGIONS; STRETCHED-EXPONENTIAL RELAXATION; SUPERCOOLED LIQUID-STATE; DEPENDENT SPECIFIC-HEAT; ADAM-GIBBS FORMULATION; VOGEL-FULCHER BEHAVIOR; LOCAL CHAIN MOTION; DIELECTRIC-RELAXATION; ENTHALPY RELAXATION AB Deviations from thermally activated and from exponential response are typical features of the vitrification phenomenon and previously have been studied using viscoelastic, dielectric, calorimetric, optical, and other techniques. Linear response data from literature on about 70 covalent glass formers, ionic melts, supercooled liquids, amorphous polymers, and glassy crystals are surveyed. Except for orientational glasses and monohydric aliphatic alcohols a distinct but broad correlation of non-Debye behavior with non-Arrhenius relaxations is found. Within the broad trend several groups of materials, distinguished by their respective molecular complexity, can be identified and are shown to exhibit narrow correlations. At a given degree of deviation from Arrhenius behavior externally imposed stresses are relaxed with a departure from exponential behavior which is stronger the more the molecular or atomic subunits of the glassforming material are interconnected with each other. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. ARIZONA STATE UNIV, DEPT CHEM, TEMPE, AZ 85287 USA. UNIV PITTSBURGH, DEPT MAT SCI & ENGN, PITTSBURGH, PA 15261 USA. RP BOHMER, R (reprint author), TECH HSCH DARMSTADT, INST FESTKORPERPHYS, D-64289 DARMSTADT, GERMANY. NR 140 TC 1503 Z9 1511 U1 29 U2 254 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD SEP 1 PY 1993 VL 99 IS 5 BP 4201 EP 4209 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LU722 UT WOS:A1993LU72200114 ER PT J AU GREM, JL JORDAN, E ROBSON, ME BINDER, RA HAMILTON, JM STEINBERG, SM ARBUCK, SG BEVERIDGE, RA KALES, AN MILLER, JA WEISS, RB MCATEE, N CHEN, A GOLDSPIEL, B SOVER, E ALLEGRA, CJ AF GREM, JL JORDAN, E ROBSON, ME BINDER, RA HAMILTON, JM STEINBERG, SM ARBUCK, SG BEVERIDGE, RA KALES, AN MILLER, JA WEISS, RB MCATEE, N CHEN, A GOLDSPIEL, B SOVER, E ALLEGRA, CJ TI PHASE-II STUDY OF FLUOROURACIL, LEUCOVORIN, AND INTERFERON ALFA-2A IN METASTATIC COLORECTAL-CARCINOMA SO JOURNAL OF CLINICAL ONCOLOGY LA English DT Article ID POLYINOSINIC-POLYCYTIDYLIC ACID; ATLANTIC ONCOLOGY PROGRAM; CELL-LINES; 5-FLUOROURACIL; COMBINATION; MODULATION; ALPHA-2A; TOXICITY; GAMMA; TRIAL C1 NCI,DIV CANC TREATMENT,CLIN ONCOL PROGRAM,BETHESDA,MD 20892. NCI,DIV CANC TREATMENT,CANC THERAPY EVALUAT PROGRAM,BETHESDA,MD 20892. NIH,WARREN G MAGNUSEN CLIN CTR,DEPT PHARM,BETHESDA,MD 20892. USN HOSP,DEPT RADIOL,BETHESDA,MD 20814. WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. FAIRFAX HEMATOL ONCOL ASSOCIATES,ANNANDALE,VA. NR 34 TC 62 Z9 62 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0732-183X J9 J CLIN ONCOL JI J. Clin. Oncol. PD SEP PY 1993 VL 11 IS 9 BP 1737 EP 1745 PG 9 WC Oncology SC Oncology GA LW369 UT WOS:A1993LW36900015 PM 8355041 ER PT J AU WILLIAMS, DE STOUCH, TR AF WILLIAMS, DE STOUCH, TR TI CHARACTERIZATION OF FORCE-FIELDS FOR LIPID MOLECULES - APPLICATIONS TO CRYSTAL-STRUCTURES SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID DYNAMICS SIMULATION; REPRESENTATION; CONFORMATION; MONOLAYERS; PARAMETERS; MEMBRANE; CHARGES; PACKING; MODEL AB The nonbonded portion of a force field for lecithins was characterized by application to the study of the crystal packing geometry and energetics of eight different molecules. The molecules were either lecithin fragments or chosen to isolate particular intermolecular features to test the accuracy of the force field specifically for those interactions. In particular, the hydrocarbon interactions, hydrogen bonding, electrostatics, and phosphate interactions were critiqued. The results support previous findings that indicated that this force field is reasonably accurate for lecithins. For all molecules, a minimum was found near the experimentally determined crystal structure. Using D-glucitol as an example, it is shown that the structural effect of hydrogen bonding is better represented by a nonelectrostatic force-field model than by a purely electrostatic model. Results obtained with glycerylphosphocholine and four smaller organic phosphate molecules suggest that further study of nonbonded interactions of phosphate groups is needed. (C) 1993 by John Wiley & Sons, Inc. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP WILLIAMS, DE (reprint author), UNIV LOUISVILLE,DEPT CHEM,LOUISVILLE,KY 40292, USA. NR 42 TC 25 Z9 25 U1 0 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD SEP PY 1993 VL 14 IS 9 BP 1066 EP 1076 DI 10.1002/jcc.540140908 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA LR799 UT WOS:A1993LR79900007 ER PT J AU SHIN, J CHIU, K STRINGFELLOW, GB GEDRIDGE, RW AF SHIN, J CHIU, K STRINGFELLOW, GB GEDRIDGE, RW TI DIISOPROPYLANTIMONYHYDRIDE (DIPSBH) FOR LOW-TEMPERATURE EPITAXIAL-GROWTH OF INSB SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID VAPOR-PHASE EPITAXY; OMVPE GROWTH; TERTIARYBUTYLDIMETHYLANTIMONY; TRIISOPROPYLANTIMONY; DECOMPOSITION; INAS; PHOTOLUMINESCENCE; DEPOSITION; PRECURSOR; MOCVD AB Low growth temperatures are necessary for the organometallic vapor phase epitaxial growth of many III/V semiconductors, particularly the low energy band gap antimonides. This has caused difficulties with conventional, established precursors because of low pyrolysis efficiencies at low temperatures and large amounts of carbon contamination in the solid. This paper gives the first results of the use of a new precursor, diisopropylantimonyhydride (DIPSbH), (C3H7)2SbH. It has been used with trimethylindium (TMIn) to produce InSb epitaxial layers at temperatures as low as 275-degrees-C with values of V/III ratio of approximately 2.5. In this regard, it is the best Sb precursor tested to date for low temperature growth. The morphology and crystallographic quality of the epitaxial layers are acceptable for semiconductor applications. Photoluminescence spectra could be measured for layers grown at 325-degrees-C and above. The spectra are similar to those from commercial InSb substrates. Van der Pauw measurements indicate that the free electron concentration of the InSb increases dramatically as the growth temperature is lowered. Layers grown at 300-degrees-C have donor densities in excess of 10(19) cm-3. The donor concentrations are much higher than for InSb grown using tertiarybutyldimethylantimony, another low-temperature Sb precursor. SIMS measurements indicate that the donor is carbon. C1 USN,CTR AIR WARFARE,DIV WEAP,DIV CHEM,OPT & ELECTR MAT BRANCH,CHINA LAKE,CA 93555. RP SHIN, J (reprint author), UNIV UTAH,DEPT MAT SCI,SALT LAKE CITY,UT 84112, USA. NR 30 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD SEP PY 1993 VL 132 IS 3-4 BP 371 EP 376 DI 10.1016/0022-0248(93)90061-Z PG 6 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA MA032 UT WOS:A1993MA03200003 ER PT J AU HULL, AJ RADCLIFFE, CJ SOUTHWARD, SC AF HULL, AJ RADCLIFFE, CJ SOUTHWARD, SC TI GLOBAL ACTIVE NOISE-CONTROL OF A ONE-DIMENSIONAL ACOUSTIC DUCT USING A FEEDBACK CONTROLLER SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article ID FINITE LENGTH; SOUND; SYSTEM AB Active noise control of acoustic enclosures is a classical engineering problem. The active noise control of a one-dimensional hard-walled duct with a partially dissipative boundary condition is addressed in this paper. Previous techniques have attacked this problem by developing adaptive filters designed to cancel acoustic noise at a single measurement location. The work presented here applies modern, state space, control theory to globally reduce noise levels in a one-dimensional acoustic enclosure rather than at a single location. This global control requires only the addition of a single response measurement microphone and control speaker to the open-loop system, Pressure measurements are taken at the microphone location and passed to an observer, which generates estimates of the system states. Using these state estimates, a pole placement feedback control algorithm is used to lower the noise level. Pole placement reduces noise levels globally by increasing the decay rates of all the controlled acoustic states. Experimental results presented here demonstrate reduction in the noise level at all points in the duct by 58 percent when the system is excited by random amplitude pressure input. C1 LORD CORP,CARY,NC 27512. MICHIGAN STATE UNIV,DEPT MECH ENGN,E LANSING,MI 48824. RP HULL, AJ (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. RI Southward, Steve/F-2457-2014 NR 25 TC 32 Z9 32 U1 2 U2 7 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD SEP PY 1993 VL 115 IS 3 BP 488 EP 494 DI 10.1115/1.2899127 PG 7 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA MA123 UT WOS:A1993MA12300024 ER PT J AU DRIELS, MR AF DRIELS, MR TI USING PASSIVE END-POINT MOTION CONSTRAINTS TO CALIBRATE ROBOT MANIPULATORS SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Note AB The concept of using a method to constrain the endpoint of a serial linkage (such as a robot manipulator) in order to identify the kinematic parameters is appealing, since it no longer becomes necessary to use ancillary equipment to measure the pose, partial or otherwise. This means that the joint angles obtained from the manipulator and knowledge of the type of constraint, are all that is needed to perform the calibration. This concept is applied to the calibration of a six-degree-of-freedom manipulator by connecting its end point to a table by means of a ball bar. The kinematic equations of the manipulator and constraint are developed, and then used to simulate the calibration process in order to determine whether the noise level present in the measurements disrupts the convergence of the process, the effect of measurement noise on the accuracy of identification and the number of experimental observations needed. The acquisition of experimental data is then described, and the results of the identification are discussed. It is concluded that for certain types of kinematic structures, this method of calibration is particularly attractive since it is rapid, simple to perform, and requires very little precision equipment. RP DRIELS, MR (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 23 TC 15 Z9 15 U1 1 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD SEP PY 1993 VL 115 IS 3 BP 560 EP 566 DI 10.1115/1.2899139 PG 7 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA MA123 UT WOS:A1993MA12300036 ER PT J AU HICKS, ML AF HICKS, ML TI HOW TO WRITE THE RESULTS SECTION OF A SCIENTIFIC PAPER SO JOURNAL OF ENDODONTICS LA English DT Article C1 USN,SCH DENT,BETHESDA,MD 20814. NR 4 TC 1 Z9 1 U1 1 U2 5 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0099-2399 J9 J ENDODONT JI J. Endod. PD SEP PY 1993 VL 19 IS 9 BP 479 EP 480 DI 10.1016/S0099-2399(06)80539-X PG 2 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LW150 UT WOS:A1993LW15000011 PM 8263459 ER PT J AU KEITH, WL BARCLAY, JJ AF KEITH, WL BARCLAY, JJ TI EFFECTS OF A LARGE-EDDY BREAKUP DEVICE ON THE FLUCTUATING WALL-PRESSURE FIELD SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID TURBULENT BOUNDARY-LAYER AB Wall pressure spectra and mean velocity profiles were measured with and without a large eddy breakup device (LEBU) located upstream in high R(theta) turbulent boundary layers. Changes of the order of 5 percent occurred in the mean wall shear stress. The wall pressure spectra of the manipulated flow did not show the existence of any highly energized coherent structures, but rather moderate changes occurring over broad frequency ranges. Reductions in the wall pressure autospectra occurred at lower frequencies associated with turbulence activity in the outer layer and the outer portion of the log law layer. Increases occurred at higher frequencies associated with the inner portion of the log law layer. The changes in the wall pressure coherence levels were similar, but generally more complex with greater spatial persistence. The changes in both the autospectra and coherence indicate a conversion of energy from lower to higher convective wavenumbers. RP KEITH, WL (reprint author), USN,UNDERSEA WARFARE CTR DETACHMENT,DEPT SUBMARINE SONAR,NEW LONDON,CT 06320, USA. NR 21 TC 8 Z9 8 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD SEP PY 1993 VL 115 IS 3 BP 389 EP 397 DI 10.1115/1.2910151 PG 9 WC Engineering, Mechanical SC Engineering GA MA450 UT WOS:A1993MA45000007 ER PT J AU SAHIN, I CRANE, J WATSON, K AF SAHIN, I CRANE, J WATSON, K TI ADDED-MASS COEFFICIENTS FOR SUBMERGED BODIES BY A LOW-ORDER PANEL METHOD SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB The added mass coefficients for two and three-dimensional submerged bodies were calculated using a low-order panel code. The source and dipole strengths, and the panel surface area for each panel, were used to compute the integrals needed for added mass in all six degrees of motions. Several applications of this method were used in comparing the results with the theoretical, when available, experimental or other numerical results. The method was found to be successful in predicting the added mass coefficients using relatively low numbers of panels. C1 USN,CTR SURFACE WARFARE,DIV DAHLGREN,COASTAL SYST STN,PANAMA CITY,FL 32401. RP SAHIN, I (reprint author), WESTERN MICHIGAN UNIV,DEPT MECH & AERONAUT ENGN,KALAMAZOO,MI 49008, USA. NR 9 TC 7 Z9 7 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD SEP PY 1993 VL 115 IS 3 BP 452 EP 456 DI 10.1115/1.2910159 PG 5 WC Engineering, Mechanical SC Engineering GA MA450 UT WOS:A1993MA45000015 ER PT J AU SMITH, BC FISHER, DL WEEDN, VW WARNOCK, GR HOLLAND, MM AF SMITH, BC FISHER, DL WEEDN, VW WARNOCK, GR HOLLAND, MM TI A SYSTEMATIC-APPROACH TO THE SAMPLING OF DENTAL DNA SO JOURNAL OF FORENSIC SCIENCES LA English DT Note DE ODONTOLOGY; DNA TYPING; ACTBP2 (SE33); HLA-DQALPHA; DENTAL IDENTIFICATION; TEETH ID POLYMERASE CHAIN-REACTION; HUMAN MITOCHONDRIAL-DNA; AMPLIFICATION; TEETH; LOCUS; ACID; AGE; HISTOLOGY AB As investigations into the forensic aspects of DNA analysis continue, the human tooth will play a dual role in identification. Dentin and enamel provide a protective enclosure for genomic and mitochondrial DNA as well as providing the basis for radiographic, biochemical, and ultrastructural forensic studies. The purpose of this investigation is to establish technical guidelines, based on histology and experimental evidence, for the management and sampling of dental DNA. The anatomic location of dental DNA is discussed with emphasis on the conservation of tooth structure during sampling. Ten pairs of maxillary right and left third molars were sampled for DNA following storage for 18 weeks at ambient temperature and humidity. Right third molars were crushed, whereas the left third molars were sectioned conservatively prior to sampling the DNA. The quantity and quality of human DNA obtained from each tooth was compared, as well as the radiographic appearance of remaining hard tissue and the overall simplicity of each approach. DNA typing was performed, both sequence and length based analyses. comparing teeth from the same individual and teeth from different donors. The results of this study suggest that the odontologist will maximize the dental DNA yield by crushing the entire specimen but that substantial yields of human DNA can be obtained by using a conservative technique that preserves the tooth structure. In addition, the method of sampling does not affect the ability to perform DNA typing analyses. C1 USN,CTR DENT,DEPT ORAL PATHOL,BETHESDA,MD 20814. ARMED FORCES INST PATHOL,ARMED FORCES DNA IDENTIFICAT LAB,WASHINGTON,DC 20306. NR 45 TC 44 Z9 45 U1 0 U2 2 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0022-1198 J9 J FORENSIC SCI JI J. Forensic Sci. PD SEP PY 1993 VL 38 IS 5 BP 1194 EP 1209 PG 16 WC Medicine, Legal SC Legal Medicine GA LY365 UT WOS:A1993LY36500029 PM 8228888 ER PT J AU MUKHERJEE, R CHEN, D AF MUKHERJEE, R CHEN, D TI ASYMPTOTIC STABILITY THEOREM FOR AUTONOMOUS SYSTEMS SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Note C1 IOWA STATE UNIV,DEPT ELECT ENGN,AMES,IA 50010. RP MUKHERJEE, R (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. RI Mukherjee, Ranjan/A-7518-2009 NR 6 TC 38 Z9 38 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD SEP-OCT PY 1993 VL 16 IS 5 BP 961 EP 963 DI 10.2514/3.21108 PG 3 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA LW547 UT WOS:A1993LW54700022 ER PT J AU WEISS, WR SEDEGAH, M BERZOFSKY, JA HOFFMAN, SL AF WEISS, WR SEDEGAH, M BERZOFSKY, JA HOFFMAN, SL TI THE ROLE OF CD4(+) T-CELLS IN IMMUNITY TO MALARIA SPOROZOITES SO JOURNAL OF IMMUNOLOGY LA English DT Article ID MONOCLONAL-ANTIBODY GK1.5; SUSCEPTIBLE BALB/C MICE; CIRCUMSPOROZOITE PROTEIN; LYMPHOCYTE-T; VIRUS-INFECTION; HELPER-CELLS; INVIVO; ELIMINATION; EPITOPE; CD4+ AB BALB/c mice are strongly protected against malaria after immunization with Plasmodium yoelii (PY) sporozoites, and this is an important model for malaria vaccine development in humans. This paper explores the role of CD4+ cells in the induction of the antimalarial immune response. The method used has been to treat animals with anti-CD4 mAb before immunization, resulting in a profound depletion of CD4+ T cells. The primary finding is that mice are not protected by sporozoite immunization after depletion of CD4+ cells. Such mice make little antibody tb malaria sporozoite Ag, showing the strong T-cell dependence of these humoral responses. However, infusion of hyperimmune serum does not restore immunity to anti-CD4 treated animals. Neither does injection of exogenous IL-2 compensate for the absence of CD4+ cells. However, regrowth of CD4+ cells does allow successful immunization of animals, showing that long-term suppression against malaria Ag has not been induced by immunization in the absence of CD4+ cells. It is thought that infiltrating CD8+ T cells are critical effector cells against PY parasites in the pre-erythrocytic stages. Mice immunized while depleted of CD4+ cells have normal numbers of CD8+ T cells infiltrating their livers. In addition, they have normal numbers of splenic CD8+ CTL directed at the PY circumsporozoite protein. Thus, it appears that although CD8+ cells have been activated in the absence of CD4+ cells, they cannot protect mice against malaria. We conclude that a successful vaccine against the pre-erythrocytic stages of malaria must activate both CD4+ and CD8+ T cells. C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. PAN AMER HLTH ORG,WASHINGTON,DC 20037. NCI,METAB BRANCH,MOLEC IMMUNOGENET & VACCINE RES SECT,BETHESDA,MD 20814. NR 43 TC 59 Z9 59 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD SEP 1 PY 1993 VL 151 IS 5 BP 2690 EP 2698 PG 9 WC Immunology SC Immunology GA LV434 UT WOS:A1993LV43400034 PM 8103069 ER PT J AU HATHAWAY, KB CHENG, SF MANSOUR, AN AF HATHAWAY, KB CHENG, SF MANSOUR, AN TI STRUCTURE AND MAGNETISM OF SPUTTERED FE/CU MULTILAYERS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL SYMP ON METALLIC MULTILAYERS ( MML 93 ) CY MAR 01-05, 1993 CL KYOTO, JAPAN SP JAPAN INST MET, RES INST PROD DEV ID FILMS; FE; CU(100) AB X-ray diffraction and X-ray absorption fine structure spectroscopy show that in sputtered Fe/Cu multilayers the thinnest Fe layers (10.5 and 6.3 angstrom) have fcc structure and a dramatically reduced magnetic moment. Thicker Fe layers (42 and 21 angstrom) have a bcc structure tetragonally distorted toward fcc. RP HATHAWAY, KB (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,WHITE OAK DETACHMENT,DEPT RES & TECHNOL,SILVER SPRING,MD 20903, USA. NR 9 TC 3 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD SEP PY 1993 VL 126 IS 1-3 BP 79 EP 81 DI 10.1016/0304-8853(93)90550-L PG 3 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA MD354 UT WOS:A1993MD35400024 ER PT J AU GUTIERREZ, CJ PRINZ, GA KREBS, JJ FILIPKOWSKI, ME HARRIS, VG ELAM, WT AF GUTIERREZ, CJ PRINZ, GA KREBS, JJ FILIPKOWSKI, ME HARRIS, VG ELAM, WT TI MAGNETIC AND STRUCTURAL STUDIES OF EPITAXIAL (001)-FE AND (001)-FEXCO1-X ALLOY FILM STRUCTURES SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL SYMP ON METALLIC MULTILAYERS ( MML 93 ) CY MAR 01-05, 1993 CL KYOTO, JAPAN SP JAPAN INST MET, RES INST PROD DEV ID MOLECULAR-BEAM EPITAXY; TEMPERATURE-DEPENDENCE; ELECTRONIC-STRUCTURE; LAYERED STRUCTURES; BCC CO; FE; EXCHANGE; SUPERLATTICES; GROWTH; MAGNETORESISTANCE AB Molecular beam epitaxy has been used to fabricate Fe/Al/Fe(001) trilayers and FexCo1-x(001) alloy films on ZnSe-epilayered GaAs(001) substrates. A temperature dependence study of the 90-degrees coupling in Fe/Al/Fe trilayers indicated a rapid decrease in coupling strength (B-12) with increasing temperature. Also, the magnetic properties of (001) FexCo1-x alloy films spanning both the thermodynamically allowed bcc regime from 0.25 < x less-than-or-equal-to 1 and the epitaxy-extended metastable bcc regime from 0 less-than-or-equal-to x less-than-or-equal-to 0.25 are reported. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GUTIERREZ, CJ (reprint author), SW TEXAS STATE UNIV,DEPT PHYS,SAN MARCOS,TX 78666, USA. RI Harris, Vincent/A-8337-2009 NR 27 TC 13 Z9 13 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD SEP PY 1993 VL 126 IS 1-3 BP 232 EP 238 DI 10.1016/0304-8853(93)90588-S PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA MD354 UT WOS:A1993MD35400062 ER PT J AU JOHNSON, CE WEIMER, WA AF JOHNSON, CE WEIMER, WA TI IDENTIFICATION OF HYDROCARBON PRECURSORS TO DIAMOND IN CHEMICAL-VAPOR-DEPOSITION USING CARBON-MONOXIDE REAGENT SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID MICROWAVE PLASMA CVD; FILM GROWTH; ACETYLENE; PRESSURE; METHANE; SYSTEMS; OXYGEN; CO/H2; RESONANCE; JET AB Diamond films were grown by microwave plasma-assisted chemical vapor deposition using mixtures of (CH4)-C-13 and CO. Mass spectrometry was used to identify CO, CH4, and C2H2 as the stable gaseous products in the reactor exhaust gas. By comparing gaseous C-13 compositions with that of the diamond films, the efficiency of diamond growth from methane (possibly via the methyl radical) is found to be about two orders of magnitude higher than that for carbon monoxide. Most of the diamond that is formed from the CO reagent results from the conversion of CO to hydrocarbons. The conversion of CO to hydrocarbons is attributed to activation of CO by high-energy electrons in the plasma. RP JOHNSON, CE (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 37 TC 2 Z9 2 U1 0 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1993 VL 8 IS 9 BP 2245 EP 2249 DI 10.1557/JMR.1993.2245 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA LU576 UT WOS:A1993LU57600018 ER PT J AU CALLAHAN, JD CONSTANTINE, NT KATAAHA, P ZHANG, X HYAMS, KC BANSAL, J AF CALLAHAN, JD CONSTANTINE, NT KATAAHA, P ZHANG, X HYAMS, KC BANSAL, J TI 2ND-GENERATION HEPATITIS-C VIRUS ASSAYS - PERFORMANCE WHEN TESTING AFRICAN SERA SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE SEROLOGIC TESTS; HEPATITIS; COMPARISON OF METHODS ID INFECTION AB Sera were collected from 426 volunteers in Uganda at high and low risk for acquisition of hepatitis C virus (HCV). All samples were tested by the Ortho HCV second generation ELISA (S1) and by the INNOTEST HCV Ab second generation enzyme immunoassay, (S2), (Innogenetics, Antwerpen, Belgium). Sera that were repeatedly reactive by either screening assay were further tested by each of two different HCV supplemental/confirmatory assays: a second generation recombinant immunoblot assay (RIBA, Ortho Diagnostics), (Cl), and a line immunoassay (INNO-LIA HCV-Ab, Innogenetics), (C2). In these populations there were 16 true positives, 351 true negatives, and 59 indeterminate results. Fifty-nine point four percent (253/426) of the samples were repeatedly reactive by the Sl test, while only 2.6% (11/426) were repeatedly reactive by S2. Test S1 produced a high false positive rate, a low positive predictive value, a specificity of 49.3%, and had a sensitivity of 100%. In contrast, the S2 screening assay had much higher specificity (98.8%), but lacked in sensitivity (31.3%). This poor sensitivity of S2 was based almost exclusively on the fact that the C2 supplemental test classified 9 samples as confirmed positive when the homologous screening assay classified these samples as negative; several of these were not confirmed when using a new generation INNO-LIA. Both the screening tests S1 and S2, and the supplemental assays C1 and C2 exhibited a significant degree of discordance, and neither of the screening tests alone would be adequate for use in these populations. (C) 1993 Wiley-Liss, Inc. C1 UNIV MARYLAND,SCH MED,DEPT PATHOL,ROOM 7-58,MSTF,10 S PINE ST,BALTIMORE,MD 21201. USN,MED RES INST,ROCKVILLE,MD. NAKASERO BLOOD BANK,KAMPALA,UGANDA. NR 11 TC 20 Z9 20 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 SEP PY 1993 VL 41 IS 1 BP 35 EP 38 DI 10.1002/jmv.1890410108 PG 4 WC Virology SC Virology GA LV410 UT WOS:A1993LV41000007 PM 7693861 ER PT J AU CARTER, WH AF CARTER, WH TI A WAVE THEORY FOR NONIMAGING CONCENTRATORS SO JOURNAL OF MODERN OPTICS LA English DT Article ID GENERALIZED RADIANCE; RADIOMETRY; COHERENCE AB An expression is found for the propagation of the radiance function for light in any state of coherence through a concentrator which can be represented by a linear, stationary optical system. For light from a quasi-homogeneous source this expression can be somewhat simplified by an approximation. It is shown that the radiance function is invariant for a large class of optical systems. Finally it is shown that fundamental limitations for the concentration of light follow from the uncertainty principle and the second law of thermodynamics, which apply quite generally. These relations show why quasi-homogeneous light (i.e. light from thermal sources) cannot be concentrated as well as light from some other sources (such as light from a laser). RP CARTER, WH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 2 Z9 2 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0340 J9 J MOD OPTIC JI J. Mod. Opt. PD SEP PY 1993 VL 40 IS 9 BP 1801 EP 1815 DI 10.1080/09500349314551821 PG 15 WC Optics SC Optics GA LW838 UT WOS:A1993LW83800018 ER PT J AU ATKINSON, JLD LANE, JI COLBASSANI, HJ LLEWELLYN, DME AF ATKINSON, JLD LANE, JI COLBASSANI, HJ LLEWELLYN, DME TI SPONTANEOUS THROMBOSIS OF POSTERIOR CEREBRAL-ARTERY ANEURYSM WITH ANGIOGRAPHIC REAPPEARANCE - CASE-REPORT SO JOURNAL OF NEUROSURGERY LA English DT Note DE CEREBRAL ANGIOGRAPHY; THROMBOSED ANEURYSM; ANEURYSM RECURRENCE ID HEMORRHAGE AB The case is presented of a 23-year-old man suffering ischemic brain infarction from spontaneous thrombosis of a left posterior cerebral artery P1-P2 junction aneurysm. Vasospasm and/or partial parent vessel occlusion were documented by magnetic resonance (MR) imaging and angiography. Repeat cerebral angiography and MR imaging 3 months later revealed patency of the posterior cerebral artery and luminal filling of a 1-cm fusiform aneurysm, which was successfully trapped at surgery. C1 USN HOSP,DEPT NEUROL SURG,OAKLAND,CA 94627. USN HOSP,DEPT NEURORADIOL,OAKLAND,CA 94627. USN HOSP,DEPT NEUROL,OAKLAND,CA 94627. NR 18 TC 29 Z9 29 U1 0 U2 0 PU AMER ASSOC NEUROLOGICAL SURGEONS PI CHARLOTTESVILLE PA UNIV VIRGINIA, 1224 WEST MAIN ST, STE 450, CHARLOTTESVILLE, VA 22903 SN 0022-3085 J9 J NEUROSURG JI J. Neurosurg. PD SEP PY 1993 VL 79 IS 3 BP 434 EP 437 DI 10.3171/jns.1993.79.3.0434 PG 4 WC Clinical Neurology; Surgery SC Neurosciences & Neurology; Surgery GA LU690 UT WOS:A1993LU69000019 PM 8360742 ER PT J AU MERZBACHER, CI MCKEOWN, DA AF MERZBACHER, CI MCKEOWN, DA TI X-RAY-ABSORPTION STUDIES OF GE AND GA ENVIRONMENTS IN BAO-GA2O3-GEO2 GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID SUBSTITUTED SILICATE-GLASSES; ALKALI GERMANATE GLASSES; NA2O-GEO2 GLASSES; COORDINATION; EXAFS; ALUMINOSILICATE; GALLIUM; SODIUM; SYSTEM; ATOMS AB The local structure surrounding Ge and Ga cations in BaO-Ga2O3-GeO2 glasses has been studied using X-ray absorption spectroscopy. Based on comparisons with results for crystalline standards, the Ge and Ga in all the glasses are predominantly in tetrahedrally coordinated sites which are disordered relative to the crystals. While bond length and coordination stay fairly constant for all the glasses, disorder steadily increases with BaO content, especially in the second shell surrounding Ge and Ga. Previously observed trends in certain macroscopic physical properties, therefore, cannot be explained by coordination changes but may be due to longer-range structural variation. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059. NR 36 TC 24 Z9 25 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1993 VL 162 IS 1-2 BP 81 EP 100 DI 10.1016/0022-3093(93)90743-H PG 20 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA LX484 UT WOS:A1993LX48400008 ER PT J AU NGAI, KL AF NGAI, KL TI ABSENCE OF DIFFERENCE BETWEEN B-11 NUCLEAR-SPIN RELAXATION AND LI ION CONDUCTIVITY RELAXATION IN (LICL)0.6-(LI2O)0.7-(B2O3)1.0 SUPERIONIC GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID BORATE GLASSES AB A pronounced difference between Li-7 nuclear spin relaxation and Li ion conductivity relaxation in a superionic lithium chloroborate glass has been observed and explained theoretically by the coupling model. An extension of the theoretical ideas to spin relaxation of nuclei tied permanently to the glassy matrix indicates that the pronounced difference with conductivity relaxation found for the mobile ion nuclear spin relaxation will no longer exist. B-11 nuclear spin relaxation data in the same lithium chloroborate glass are used to support this prediction. RP NGAI, KL (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6807,WASHINGTON,DC 20375, USA. NR 26 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD SEP PY 1993 VL 162 IS 3 BP 268 EP 274 DI 10.1016/0022-3093(93)91246-Y PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA LY371 UT WOS:A1993LY37100008 ER PT J AU WU, CT AF WU, CT TI TEACHING OOP IN 3 STAGES, STAGE-3 SO JOURNAL OF OBJECT-ORIENTED PROGRAMMING LA English DT Article C1 USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SIGS PUBLICATIONS INC PI NEW YORK PA 588 BROADWAY SUITE 604, NEW YORK, NY 10012-5408 SN 0896-8438 J9 J OBJECT-ORIENT PROG JI J. Object-Oriented Program. PD SEP PY 1993 VL 6 IS 5 BP 62 EP & PG 0 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA LV445 UT WOS:A1993LV44500008 ER PT J AU GREENBERG, DN ASCHER, DP YODER, BA HENSLEY, DM HEIMAN, HS KEITH, JF AF GREENBERG, DN ASCHER, DP YODER, BA HENSLEY, DM HEIMAN, HS KEITH, JF TI GROUP-B STREPTOCOCCUS SEROTYPE-V SO JOURNAL OF PEDIATRICS LA English DT Letter C1 WILFORD HALL USAF, MED CTR, CLIN INVEST DIRECTORATE, SAN ANTONIO, TX 78250 USA. BROOKE ARMY MED CTR, DEPT PEDIAT, FT SAM HOUSTON, TX 78234 USA. USN HOSP, DEPT PEDIAT, SAN DIEGO, CA 92134 USA. RP GREENBERG, DN (reprint author), WILFORD HALL USAF, MED CTR, DEPT PEDIAT, SAN ANTONIO, TX 78250 USA. NR 3 TC 9 Z9 9 U1 0 U2 0 PU MOSBY-ELSEVIER PI NEW YORK PA 360 PARK AVENUE SOUTH, NEW YORK, NY 10010-1710 USA SN 0022-3476 EI 1097-6833 J9 J PEDIATR-US JI J. Pediatr. PD SEP PY 1993 VL 123 IS 3 BP 494 EP 495 DI 10.1016/S0022-3476(05)81778-0 PG 2 WC Pediatrics SC Pediatrics GA LW160 UT WOS:A1993LW16000038 PM 8355135 ER PT J AU FUCINI, SE QUINTERO, G GHER, ME BLACK, BS RICHARDSON, AC AF FUCINI, SE QUINTERO, G GHER, ME BLACK, BS RICHARDSON, AC TI SMALL VERSUS LARGE PARTICLES OF DEMINERALIZED FREEZE-DRIED BONE ALLOGRAFTS IN HUMAN INTRABONY PERIODONTAL DEFECTS SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE BONE, DEMINERALIZED FREEZE DRIED; BONE REGENERATION; PERIODONTAL DISEASES THERAPY; GRAFTS SURGERY ID ATTACHMENT APPARATUS FORMATION; OSSEOUS DEFECTS; HISTOLOGIC EVALUATION; HYDROXYAPATITE AB VARIOUS PARTICLE SIZES of demineralized freeze-dried bone allograft (DFDBA) are currently used to treat patients with periodontal osseous defects. However, the effect of particle size on the healing of human intrabony periodontal defects is unknown since there have been no direct clinical comparisons. The purpose of this study was to compare the bony defect resolution obtained using two different particle size ranges of DFDBA. Cortical bone from a single donor was processed and ground to final particle sizes of 250mu to 500mu or 850mu to 1,000mu using an analytic mill. Paired interproximal intrabony periodontal defects in 11 patients were grafted with DFDBA. Soft and hard tissue measurements were made using an electronic constant-force probe at the initial and reentry surgeries. Treated sites in 10 patients were reevaluated by reentry approximately 6 months postoperatively. Mean bony defect fill was 1.66 mm for the large particle group and 1.32 mm for the small particle group. There was no statistically significant difference in bony fill between defects grafted with the different particle sizes of DFDBA when used in humans. RP FUCINI, SE (reprint author), USN,SCH DENT,NATL NAVAL DENT CTR,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 20 TC 25 Z9 26 U1 0 U2 1 PU AMER ACAD PERIODONTOLOGY PI CHICAGO PA 737 NORTH MICHIGAN AVENUE, SUITE 800, CHICAGO, IL 60611-2690 SN 0022-3492 J9 J PERIODONTOL JI J. Periodont. PD SEP PY 1993 VL 64 IS 9 BP 844 EP 847 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA MA323 UT WOS:A1993MA32300002 PM 8229619 ER PT J AU TOMLIN, DW ROLAND, CM SLUTSKER, LI AF TOMLIN, DW ROLAND, CM SLUTSKER, LI TI TRANSVERSE HETEROGENEITY IN PET FIBERS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE POLY(ETHYLENE TEREPHTHALATE); TRANSVERSE HETEROGENEITY; CRYSTALLINITY; HIGH SPEED SPINNING ID X-RAY-SCATTERING; SPUN POLY(ETHYLENE-TEREPHTHALATE) FIBERS; HIGHLY ORIENTED STATE; LOW SHRINKAGE HMLS; STRUCTURAL DEVELOPMENT; PHYSICAL STRUCTURE; MELTING BEHAVIOR; HIGH MODULUS; SPEED; CRYSTALLIZATION AB X-ray scattering from a series of poly (ethylene terephthalate) (PET) fibers spun at different speeds is analyzed to probe the morphology in the direction transverse to the fiber axis. Both the apparent crystal modulus, determined from the change in wide-angle X-ray scattering angle with fiber stretching, and the transverse degree of crystallinity indicate there is a substantial interfibrillar amorphous content. In the PET fiber spun at conventional speeds, only roughly one-quarter of the fiber cross-section is actually occupied by fibrils. The transverse crystallinity increases for fibers spun at speeds sufficient to cause crystallization in the spin line. The X-ray moduli and fibril diameters are correspondingly larger in these high speed spun fibers. (C) 1993 John Wiley & Sons, Inc. C1 AMOCO FABRICS & FIBERS CO,CTR RES & DEV,ATLANTA,GA 30336. RP TOMLIN, DW (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 52 TC 8 Z9 8 U1 0 U2 3 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD SEP PY 1993 VL 31 IS 10 BP 1331 EP 1337 DI 10.1002/polb.1993.090311008 PG 7 WC Polymer Science SC Polymer Science GA LR473 UT WOS:A1993LR47300008 ER PT J AU PENG, KL ROLAND, CM AF PENG, KL ROLAND, CM TI THE AMORPHOUS PHASE IN HIGH-SPEED SPUN PET FIBERS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE POLY(ETHYLENE TEREPHTHALATE); SERIES-PARALLEL MODEL; SERIES-AGGREGATE MODEL; HIGH-SPEED SPINNING ID LOW SHRINKAGE HMLS; X-RAY-SCATTERING; HIGH-MODULUS; POLY(ETHYLENE-TEREPHTHALATE) FIBERS; POLYETHYLENE TEREPHTHALATE; INDUCED CRYSTALLIZATION; TENSILE DEFORMATION; TEMPERATURE; STRENGTH; PRESSURE AB Two phenomenogical descriptions of oriented semicrystalline polymers, the series-parallel model and the series-aggregate model, were applied to poly (ethylene terephthalate) (PET) fibers obtained at different spinning speeds. The mechanical behavior of the fibers conformed well to both models. The analyses indicate that PET fibers obtained by high-speed spinning possess a more compliant interfibrillar amorphous phase. This feature may account for both the greater dimensional stability, as well as the more reversible mechanical behavior, exhibited by high-speed spun PET. (C) 1993 John Wiley & Sons, Inc. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 54 TC 15 Z9 15 U1 1 U2 5 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD SEP PY 1993 VL 31 IS 10 BP 1339 EP 1345 DI 10.1002/polb.1993.090311009 PG 7 WC Polymer Science SC Polymer Science GA LR473 UT WOS:A1993LR47300009 ER PT J AU WARREN, SD ASCHMANN, SG AF WARREN, SD ASCHMANN, SG TI REVEGETATION STRATEGIES FOR KAHOOLAWE ISLAND, HAWAII SO JOURNAL OF RANGE MANAGEMENT LA English DT Article DE FERTILIZATION; JUTE NETTING; WINDBREAK FENCE; DRILL SEEDING AB Over the past 2 centuries, the island of Kaho'olawe has suffered the ravages of war, slash-and-burn agriculture, and overgrazing. Today, much of the island is barren and severely eroded. A research project initiated in 1988 has sought to identify effective, economical techniques to revegetate portions of the island. Treatments included drill seeding plus several rates of fertilization with monoammonium phosphate (11-52-0). Some treatments also include jute netting for soil moisture conservation and erosion control. The effect of windbreak fencing was evaluated across all treatments. Drill seeding plus broadcast application of at least 62 kg ha-1 N plus 291 kg ha-1 P(2)0(5) was the most cost-effective treatment. Jute netting and windbreak fencing significantly enchanced plant production, but the high cost of materials and maintenance limits their use to critical areas. The planted species with greatest promise for the windy, semiarid conditions on Kaho'olawe were buffelgrass (Cenchrus ciliaris L.), bermudagrass [Cynodon dactylon (L.) Pers.] and weeping lovegrass [Eragrostis curvula (Schrad.) Nees]. Although not included in the seed mixture, Australian saltbush (A triplex semibaccata R. Br.), a naturalized species, responded favorably to fertilization. A subsequent, larger-scale revegetation project using a specially modified chisel plow seeder to scarify, plant, and apply in-furrow fertilization in a single-pass operation reduced the cost and improved the results of the revegetation process. C1 USN,FACIL ENGN COMMAND,PACIFIC DIV,HONOLULU,HI 96860. RP WARREN, SD (reprint author), USA,CONSTRUCT ENGN RES LABS,ENVIRONM SUSTAINMENT LAB,POB 9005,CHAMPAIGN,IL 61826, USA. NR 19 TC 7 Z9 7 U1 1 U2 5 PU SOC RANGE MANAGEMENT PI DENVER PA 1839 YORK ST, DENVER, CO 80206 SN 0022-409X J9 J RANGE MANAGE JI J. Range Manage. PD SEP PY 1993 VL 46 IS 5 BP 462 EP 466 DI 10.2307/4002668 PG 5 WC Agriculture, Dairy & Animal Science; Ecology SC Agriculture; Environmental Sciences & Ecology GA LY502 UT WOS:A1993LY50200016 ER PT J AU YOST, DS AF YOST, DS TI FRANCE AND THE GULF-WAR OF 1990-1991 - POLITICAL-MILITARY LESSONS LEARNED SO JOURNAL OF STRATEGIC STUDIES LA English DT Article C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. NR 37 TC 2 Z9 2 U1 0 U2 1 PU FRANK CASS CO LTD PI LONDON PA 11 GAINSBOROUGH ROAD, LONDON, ENGLAND E11 1RS SN 0140-2390 J9 J STRATEGIC STUD JI J. Strateg. Stud. PD SEP PY 1993 VL 16 IS 3 BP 339 EP 374 DI 10.1080/01402399308437522 PG 36 WC International Relations; Political Science SC International Relations; Government & Law GA MH246 UT WOS:A1993MH24600002 ER PT J AU ABDELHAMID, TK AF ABDELHAMID, TK TI A MULTIPROJECT PERSPECTIVE OF SINGLE-PROJECT DYNAMICS SO JOURNAL OF SYSTEMS AND SOFTWARE LA English DT Article AB Heretofore, the study of software project management has been limited to a single-project-in-isolation perspective, largely overlooking the interdependencies among projects. This is despite the fact that few, if any, actual software projects are carried out in complete isolation. In this work, I relax the project-in isolation assumption and attempt to demonstrate that interactions and interdependencies among projects can have a significant influence on project behavior. As such, the behavior of an individual project in isolation may be very different from its behavior when it interacts with other projects. The research vehicle for this study is a multiproject system dynamics model that was developed on the basis of field studies in five organizations. The results of a case study conducted in a sixth organization to test the model's accuracy in replicating the behavior of two concurrent software projects are presented. In the final section of the paper, I conduct a number of model-based controlled experiments to assess the effects of inter-project interdependencies on project behavior. The results suggest that scheduling and work force allocation decisions in one project can significantly influence the cost and duration of the other. The significance of these results is twofold. First, they highlight a fundamental deficiency in the formulation of the current generation of estimation tools. Second, they underscore the perils of parochial decision making in a multiproject environment. C1 USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93940. NR 21 TC 15 Z9 16 U1 1 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0164-1212 J9 J SYST SOFTWARE JI J. Syst. Softw. PD SEP PY 1993 VL 22 IS 3 BP 151 EP 165 DI 10.1016/0164-1212(93)90107-9 PG 15 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA LU699 UT WOS:A1993LU69900002 ER PT J AU PFLUG, LA LOUP, GE LOUP, JW FIELD, RL LECLERE, JH AF PFLUG, LA LOUP, GE LOUP, JW FIELD, RL LECLERE, JH TI TIME-DELAY ESTIMATION FOR DETERMINISTIC TRANSIENTS USING 2ND-ORDER AND HIGHER-ORDER CORRELATIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DOMAIN SOLUTION; SPECTRA; NOISE AB Cross-correlation, bicorrelation, and tricorrelation time-delay estimation methods both without and with rectification are compared for finite energy signals (transients). Signals with uncorrelated Gaussian noise distortion as well as signals with propagation distortion, e.g., multipath and attenuation effects, are considered. Measures of performance include calculations of the probabilities of correct time-delay estimation and the standard deviations of all the estimates over appropriate signal-to-noise ratio (SNR) domains, and tables of limiting SNR's corresponding to small mean deviation from the true time delay. For the known source case with noise-only distortion, the cross-correlation method performs best. For the known source case with propagation distortion and the unknown source case both without and with propagation distortion, the higher-order methods or the cross-correlation method with rectification sometimes show better ability to estimate the exact time delay than the ordinary cross correlation. For all cases, the bicorrelation method is very poor for signals with low skewness of ordinate values, but it can be improved significantly by using rectification. Included is a discussion of the problems encountered when using correlations containing correlation bias for time-delay estimation of energy transients embedded in noise, and arguments for defining correlations using wraparound to overcome the bias in the noise correlation and improve time-delay estimation. 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 20 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1993 VL 94 IS 3 BP 1385 EP 1399 DI 10.1121/1.408167 PN 1 PG 15 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LX118 UT WOS:A1993LX11800023 ER PT J AU CHANG, W BOSWORTH, B CARTER, GC AF CHANG, W BOSWORTH, B CARTER, GC TI RESULTS OF USING AN ARTIFICIAL NEURAL-NETWORK TO DISTINGUISH SINGLE ECHOES FROM MULTIPLE SONAR ECHOES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SIGNAL AB Empirical results illustrate the pitfalls of applying an artificial neural network (ANN) to classifying underwater active sonar returns. During training, a back propagation ANN classifier ''learns'' to recognize two classes of reflected active sonar waveforms. Waveforms in class 1 have two major sonar echoes or peaks. Waveforms in class 2 have one major echo or peak. Our results show how the classifier ''learns'' to distinguish between the two classes. Testing the ANN classifier with different waveforms having one major peak, and waveforms having two major peaks generated unexpected results: The number of echo peaks was not the feature used to separate classes. RP CHANG, W (reprint author), USN,UNDERSEA WARFARE CTR DETACHMENT,39 SMITH ST,NEW LONDON,CT 06320, USA. NR 13 TC 5 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 SEP PY 1993 VL 94 IS 3 BP 1404 EP 1408 DI 10.1121/1.408169 PN 1 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LX118 UT WOS:A1993LX11800025 ER PT J AU KARGL, SG LIM, R AF KARGL, SG LIM, R TI A TRANSITION-MATRIX FORMULATION OF SCATTERING IN HOMOGENEOUS, SATURATED, POROUS-MEDIA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ELASTIC-WAVE SCATTERING; LONG-WAVELENGTH PROPAGATION; ACOUSTIC SLOW WAVES; EXPERIMENTAL CONFIRMATION; LAYERED MEDIA; CROSS-SECTION; BIOT WAVES; T-MATRIX; FLUID; REFLECTION AB Scattering by an obstacle embedded within a homogeneous host is analyzed in the context of Biot's theory. Both host and scatterer are assumed to be fluid-saturated poroelastic media. A transition matrix that accounts for the additional slow longitudinal wave is constructed from a Betti's identity generalized to poroelastic media. Extinction, scattering, and absorption cross sections are defined for objects embedded in nonattenuating hosts. When attenuation is significant in the host (as is typical in saturated porous media), appropriately scaled, far-field scattering amplitudes are used to investigate scattering dynamics. General results are presented and specialized to spherical objects where the elements of the transition matrix may be obtained in closed form. Using effective medium estimates of Biot parameters where needed, numerical calculations of cross sections and scattering amplitudes are presented for incident plane-wave fields. Several limiting cases are discussed. RP KARGL, SG (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,COASTAL SYST STN,CODE 130B,6703 W HIGHWAY 98,PANAMA CITY,FL 32407, USA. NR 50 TC 22 Z9 22 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1993 VL 94 IS 3 BP 1527 EP 1550 DI 10.1121/1.408129 PN 1 PG 24 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LX118 UT WOS:A1993LX11800040 ER PT J AU BISHOP, GC SMITH, J AF BISHOP, GC SMITH, J TI A T MATRIX FOR SCATTERING FROM A DOUBLY INFINITE FLUID SOLID INTERFACE WITH DOUBLY PERIODIC SURFACE-ROUGHNESS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ELASTIC WAVE SCATTERING AB The T-matrix formalism is used to calculate scattering of a plane wave from a doubly infinite fluid-solid interface with doubly periodic surface roughness. The Helmholtz-Kirchhoff integral equations are used to represent the scattered pressure field in the fluid and the displacement field in the solid. The boundary conditions are applied and a system of four coupled integral equations is obtained. The incident and scattered pressure fields in the fluid, as well as the surface pressure field, are represented by infinite series of scalar Floquet plane waves, while the scattered displacement field in the solid and the surface displacement field are represented by infinite series of rectangular vector basis functions constructed from Floquet plane waves. This process discretizes the integral equations and transforms them into a system of four coupled doubly infinite linear equations. The extended boundary condition is applied and the T matrix that relates the spectral amplitudes of the incident field to the spectral amplitudes of the scattered fields is constructed. An exact analytic solution and numerical results are obtained for plane wave scattering from doubly periodic sinusoidal and triangular surface roughness. RP BISHOP, GC (reprint author), USN,CTR UNDERSEA WARFARE,DIV NEWPORT,NEWPORT,RI 02840, USA. NR 17 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1993 VL 94 IS 3 BP 1560 EP 1583 DI 10.1121/1.408131 PN 1 PG 24 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LX118 UT WOS:A1993LX11800042 ER PT J AU KO, SH AF KO, SH TI PERFORMANCE OF SHADED, RECTANGULAR HYDROPHONES IN THE REDUCTION OF TURBULENT-FLOW NOISE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ARRAY AB Turbulent boundary layer pressure fluctuations can be reduced by filtering either a wave number through a finite hydrophone or a hydrophone array or by filtering the wave number through an elastomer layer. In general practice, various configurations of hydrophone arrays are embedded within a layer of elastomer, thus reducing the turbulent boundary layer pressure fluctuations. The theoretical model considered in this paper is a plane elastomer layer backed by an infinitely rigid surface; the other side of the layer is exposed to turbulent flow. This paper examines the performance of shaded, rectangular hydrophones for the flow noise reduction. The rectangular hydrophone is shaded with a triangular, semicircular, or cosine weighting function in the flow direction. Numerical calculations were made for both flush-mounted and embedded hydrophones. The results presented are comparisons of numerically calculated noise reductions between shaded and unshaded hydrophones. RP KO, SH (reprint author), USN,UNDERSEA WARFARE CTR DETACHMENT,NEW LONDON,CT 06320, USA. NR 8 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1993 VL 94 IS 3 BP 1681 EP 1687 DI 10.1121/1.408141 PN 1 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LX118 UT WOS:A1993LX11800052 ER PT J AU MONTGOMERY, RE DUBUS, B AF MONTGOMERY, RE DUBUS, B TI AN ANALYTICAL EVALUATION OF TURBULENCE-INDUCED FLEXURAL NOISE IN PLANAR ARRAYS OF EXTENDED SENSORS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID BOUNDARY-LAYER; RADIATION AB Large-area, hull-mounted conformal sonar arrays typically employ extended sensors that are configured to detect acoustic signals by means of thickness strains that are induced by the incident pressure field. In most cases, extended sensors also have an appreciable sensitivity to strains in the lateral dimensions. Thus flexure of such a sensor would induce a signal that would not be differentiated from that of a target. Hull-mounted conformal arrays are evolving toward using lightweight, flexible sensors and support structures; therefore, flexure-induced noise is an ever present concern. This paper presents an analytical approach and a general mathematical model for the noise arising from flexure of the array support plate coupled into the array via the lateral sensitivity of the sensor. The excitation that drives the flexure is assumed to be the turbulent boundary layer created by motion of the platform through the external fluid medium. An analytical expression is derived for the equivalent plane-wave spectral density for this noise source. The result is expressed in terms of the frequency response function of the plate, the wave-number-frequency spectral density of the excitation, and the spatial filtering characteristics of the array. An application is discussed to show that predictions can be obtained in closed form. C1 INST SUPER ELECTR N,F-59046 LILLE,FRANCE. RP MONTGOMERY, RE (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 26 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1993 VL 94 IS 3 BP 1688 EP 1699 DI 10.1121/1.408142 PN 1 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LX118 UT WOS:A1993LX11800053 ER PT J AU SANGHERA, JS AGGARWAL, ID AF SANGHERA, JS AGGARWAL, ID TI MICRO-RAMAN ANALYSIS OF CARBON INCLUSIONS IN HEAVY-METAL FLUORIDE GLASSES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID FIBERS; GRAPHITE AB While vitreous carbon crucibles can be used to produce high-quality heavy-metal fluoride glasses using low concentrations of SF6 gas (15%), pure SF6 gas produces low-quality and high-scattering glasses. This has been attributed to contamination by vitreous carbon particles by a fallback mechanism due to reaction of SF6 gas with the crucible walls above the melt. The detrimental effect of carbon particles is further highlighted by their high scattering efficiency factor which indicates that only 37 particles of 1-mum diameter can be tolerated in an optical fiber for attaining 0.01 dB/km loss. RP SANGHERA, JS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 1 Z9 1 U1 0 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD SEP PY 1993 VL 76 IS 9 BP 2341 EP 2344 DI 10.1111/j.1151-2916.1993.tb07774.x PG 4 WC Materials Science, Ceramics SC Materials Science GA LZ616 UT WOS:A1993LZ61600026 ER PT J AU BUSCHER, DF HANIFF, CA AF BUSCHER, DF HANIFF, CA TI DIFFRACTION-LIMITED IMAGING WITH PARTIALLY REDUNDANT MASKS .2. OPTICAL IMAGING OF FAINT SOURCES SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID SPECKLE INTERFEROMETRY; APERTURE-SYNTHESIS; BETELGEUSE; STARS; PHASE; MIRA AB In a recent paper [J. Opt. Soc. Am. A 9, 203 (1992)] the benefits of pupil apodization were examined for the near-infrared imaging of bright sources. In the current paper we extend these considerations to optical speckle imaging, in which photon noise rather than detector readout noise is important. We demonstrate that a one-dimensional pupil geometry (i.e., a thin slit) has several advantages over an unapodized aperture when faint sources are being observed through atmospheric turbulence. The use of a slit aperture does not decrease the signal-to-noise ratios of the power-spectrum and bispectrum measurements, and in many cases it increases them, despite the large reduction in signal level. The disadvantage of this apodization is a reduction in Fourier-plane coverage, which must be compensated for by observations with the slit aligned at several position angles. The performance of many of the current generation of photon-counting imaging detectors deteriorates at the high counting rates that can be experienced even when one is observing sources that are approaching the limiting magnitude of the speckle imaging technique. Under such conditions, we recommend the use of an apodized pupil, in contrast to the current preference for employing a neutral-density filter to reduce the detector count rate. C1 CALTECH,PALOMAR OBSERV,PASADENA,CA 91125. RP BUSCHER, DF (reprint author), USN OBSERV,RES LAB,OPT INTERFEROMETER PROJECT,AD5,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 31 TC 11 Z9 11 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD SEP PY 1993 VL 10 IS 9 BP 1882 EP 1894 DI 10.1364/JOSAA.10.001882 PG 13 WC Optics SC Optics GA LY191 UT WOS:A1993LY19100004 ER PT J AU NEE, SF BENNETT, HE AF NEE, SF BENNETT, HE TI ACCURATE NULL POLARIMETRY FOR MEASURING THE REFRACTIVE-INDEX OF TRANSPARENT MATERIALS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID SURFACE-ROUGHNESS; ELLIPSOMETRY AB Simple null polarimetry is introduced to measure the refractive index n of transparent and semitransparent materials. For a linearly polarized incident light, the reflected polarization can be used to determine n with the Fresnel equations. This method is fast, convenient, and versatile enough to provide accurate results on small laboratory samples. Possible errors in experiments are analyzed, and ways to eliminate these errors are given. With our instrument, the uncertainty in the deduced n is +/-0.0004. The accuracy is still within 0.1% for materials with high n and with the extinction coefficient of the order of 0.001. The method is also sufficiently accurate for characterizing the homogeneity of transparent materials. RP NEE, SF (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 16 TC 13 Z9 13 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD SEP PY 1993 VL 10 IS 9 BP 2076 EP 2083 DI 10.1364/JOSAA.10.002076 PG 8 WC Optics SC Optics GA LY191 UT WOS:A1993LY19100027 ER PT J AU TWIDWELL, JJ MATTHEWS, RD HUISAM, TK SANDS, JP AF TWIDWELL, JJ MATTHEWS, RD HUISAM, TK SANDS, JP TI ULTRASOUND EVALUATION OF THE PROSTATE AFTER ABDOMINOPERINEAL RESECTION SO JOURNAL OF UROLOGY LA English DT Article DE PROSTATIC NEOPLASMS; PROSTATECTOMY; ULTRASONOGRAPHY ID ANTIGEN; CANCER AB Prostate evaluation after abdominoperineal resection is hampered by the inability of the physician to perform digital rectal examination and transrectal ultrasound. Laboratory evaluation alone is not specific, and computerized tomography and magnetic resonance imaging are costly while yielding unclear results. We evaluated 23 men with prostate specific antigen, prostatic acid phosphatase and transperineal ultrasound of the prostate, using an elevated prostate specific antigen level and/or hypoechoic focus as indications for biopsy. Ten men underwent transperineal biopsy of the prostate and in 2 biopsies revealed prostate carcinoma. Transperineal ultrasound allows for accurate evaluation of the prostate in men following abdominoperineal resection as well as accurate biopsy when indicated. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT UROL,SAN DIEGO,CA 92134. NR 7 TC 12 Z9 12 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 SEP PY 1993 VL 150 IS 3 BP 902 EP 904 PG 3 WC Urology & Nephrology SC Urology & Nephrology GA LR890 UT WOS:A1993LR89000027 PM 7688436 ER PT J AU CLEVELAND, JS WEIDEMANN, AD AF CLEVELAND, JS WEIDEMANN, AD TI QUANTIFYING ABSORPTION BY AQUATIC PARTICLES - A MULTIPLE-SCATTERING CORRECTION FOR GLASS-FIBER FILTERS SO LIMNOLOGY AND OCEANOGRAPHY LA English DT Note ID FLUORESCENCE EXCITATION-SPECTRA; PHYTOPLANKTON; COEFFICIENTS; SEA AB Absorption spectra measured for aquatic particles concentrated onto glass-fiber filters require a correction for the increase in pathlength caused by multiple scattering in the glass-fiber filter. A multiple scattering correction was calculated from optical density spectra for 48 phytoplankton cultures of seven species representing a variety of cell sizes, pigment groups, and cell-wall types. The relationship between optical density in suspensions and on filters was not wavelength-dependent. Differences between blank filters were always spectrally neutral. Small differences between relationships for single species were inconclusive. Given the absence of wavelength-dependent effects, we report a single general quadratic relationship, OD(susp)(lambda) = 0.378 OD(filt)(lambda) + 0.523 OD(filt)(lambda)2 (r2 = 0.988), for correcting glass-fiber filter spectra. For independent samples, the average error in predicting OD(susp)(lambda) with this algorithm at any wavelength was 2%. Greatest errors were in spectral regions of low absorption. Absorption spectra for particles concentrated onto glass-fiber filters can be quantitatively corrected for multiple scattering within this limit. Applicability of the algorithm to field samples of varied composition was enhanced by using a large number of spectra and a range of cell types in algorithm development. C1 USN,RES LAB,BAY ST LOUIS,MS 39529. RP CLEVELAND, JS (reprint author), SAN DIEGO STATE UNIV,CTR HYDROOPT & REMOTE SENSING,6505 ALVARADO RD,SUITE 206,SAN DIEGO,CA 92120, USA. NR 13 TC 234 Z9 269 U1 1 U2 7 PU AMER SOC LIMNOLOGY OCEANOGRAPH PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044-8897 SN 0024-3590 J9 LIMNOL OCEANOGR JI Limnol. Oceanogr. PD SEP PY 1993 VL 38 IS 6 BP 1321 EP 1327 PG 7 WC Limnology; Oceanography SC Marine & Freshwater Biology; Oceanography GA ME147 UT WOS:A1993ME14700022 ER PT J AU SAXENA, N HOTTA, K HOPLEY, D TALKINGTON, H WILTSHIRE, J AF SAXENA, N HOTTA, K HOPLEY, D TALKINGTON, H WILTSHIRE, J TI TECHNICAL REPORT OF THE 5TH-PACIFIC-CONGRESS-ON-MARINE-SCIENCE-AND-TECHNOLOGY (PACON 92) SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Editorial Material C1 NIHON UNIV,TOKYO,TOKYO,JAPAN. JAMES COOK UNIV N QUEENSLAND,TOWNSVILLE,QLD 4811,AUSTRALIA. USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA. RP SAXENA, N (reprint author), UNIV HAWAII,HONOLULU,HI 96822, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD FAL PY 1993 VL 27 IS 3 BP 55 EP 61 PG 7 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA MM994 UT WOS:A1993MM99400007 ER PT J AU LITTLE, BJ WAGNER, PA AF LITTLE, BJ WAGNER, PA TI INTERRELATIONSHIP BETWEEN MARINE BIOFOULING AND CATHODIC PROTECTION SO MATERIALS PERFORMANCE LA English DT Article AB Microorganisms colonize and form a gelatinous biofilm on all engineering materials exposed in natural marine environments, including cathodically protected surfaces. The impact of cathodic protection (CP) potentials on the chemical/biological composition of the biofilm and the impact of the biofilms on potentials required for CP have been the subject of many recent investigations. Literature on these subjects will be reviewed with emphasis on clarifying interactions between living and nonliving deposits on cathodically protected metal surfaces. RP LITTLE, BJ (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 13 TC 6 Z9 6 U1 1 U2 4 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0094-1492 J9 MATER PERFORMANCE JI Mater. Perform. PD SEP PY 1993 VL 32 IS 9 BP 16 EP 20 PG 5 WC Materials Science, Characterization & Testing SC Materials Science GA LV709 UT WOS:A1993LV70900002 ER PT J AU WAGNER, P LITTLE, B AF WAGNER, P LITTLE, B TI IMPACT OF ALLOYING ON MICROBIOLOGICALLY INFLUENCED CORROSION - A REVIEW SO MATERIALS PERFORMANCE LA English DT Review AB Alloying elements are added to metals to improve workability, electrical properties, and corrosion resistance. Alloying elements also alter the formation, chemical composition, thickness, and tenacity of corrosion products and may increase or decrease susceptibility to microbiologically influenced corrosion (MIC). The influence of alloying elements on MIC are reviewed for stainless steels and copper, nickel, aluminum, and titanium alloys. RP WAGNER, P (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 15 TC 23 Z9 28 U1 0 U2 9 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0094-1492 J9 MATER PERFORMANCE JI Mater. Perform. PD SEP PY 1993 VL 32 IS 9 BP 65 EP 68 PG 4 WC Materials Science, Characterization & Testing SC Materials Science GA LV709 UT WOS:A1993LV70900010 ER PT J AU HARFORD, RR REED, HL MORRIS, MT SAPIEN, IE WARDEN, R DALESANDRO, MM AF HARFORD, RR REED, HL MORRIS, MT SAPIEN, IE WARDEN, R DALESANDRO, MM TI RELATIONSHIP BETWEEN CHANGES IN SERUM THYROTROPIN AND TOTAL AND LIPOPROTEIN CHOLESTEROL WITH PROLONGED ANTARCTIC RESIDENCE SO METABOLISM-CLINICAL AND EXPERIMENTAL LA English DT Article ID COLD; HYPOTHYROIDISM; METABOLISM; KINETICS C1 MADIGAN ARMY MED CTR,ENDOCRINE SERV,TACOMA,WA 98431. RP HARFORD, RR (reprint author), USN,MED RES INST,THERMAL STRESS ADAPTAT PROGRAM,CODE 427,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 25 TC 20 Z9 20 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0026-0495 J9 METABOLISM JI Metab.-Clin. Exp. PD SEP PY 1993 VL 42 IS 9 BP 1159 EP 1163 DI 10.1016/0026-0495(93)90274-R PG 5 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA LZ809 UT WOS:A1993LZ80900015 PM 8412769 ER PT J AU ELLISON, KH MCNELLEY, TR FOX, AG AF ELLISON, KH MCNELLEY, TR FOX, AG TI CREEP-BEHAVIOR OF AN AL-2.0 WT PCT LI ALLOY IN THE TEMPERATURE-RANGE 300-DEGREES-C TO 500-DEGREES-C SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID SOLID-SOLUTION ALLOYS; AL-LI; DECOMPOSITION; DEFORMATION; DELTA'; GLIDE AB The elevated temperature deformation behavior of an Al-2.0 wt pct Li alloy in the temperature range 300-degrees-C to 500-degrees-C was studied using constant extension-rate tension testing and constant true-stress creep testing under both isothermal and temperature cycling conditions. Optical microscopy and transmission electron microscopy (TEM) were employed to assess the effect of deformation on microstructure. The data showed that the stress exponent, n, has a value of about 5.0 at temperatures above the alpha + deltaAlLi solvus (approximately 380-degrees-C) and that subgrains form during plastic deformation. Models for dislocation-climb and dislocation-glide control of creep were analyzed for alloys deformed in the temperature range of stability of the terminal AlLi solid solution. A climb model was shown to describe closely the behavior of this material. Anomalous temperature dependence of the activation energy was observed in this same temperature range. This anomalous behavior was ascribed to unusual temperature dependence of either the Young's modulus or the stacking fault energy, which may be associated, in turn, with a disorder-order transformation on cooling of the alloy. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP ELLISON, KH (reprint author), FORD MOTOR CO,DEARBORN,MI 48120, USA. NR 29 TC 1 Z9 1 U1 1 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD SEP PY 1993 VL 24 IS 9 BP 2001 EP 2007 DI 10.1007/BF02666335 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA LU882 UT WOS:A1993LU88200011 ER PT J AU KIRCHNER, D RESSLER, H GRUDLER, P BAUMONT, F VEILLET, C LEWANDOWSKI, W HANSON, W KLEPCZYNSKI, W UHRICH, P AF KIRCHNER, D RESSLER, H GRUDLER, P BAUMONT, F VEILLET, C LEWANDOWSKI, W HANSON, W KLEPCZYNSKI, W UHRICH, P TI COMPARISON OF GPS COMMON-VIEW AND 2-WAY SATELLITE TIME TRANSFER OVER A BASE-LINE OF 800-KM SO METROLOGIA LA English DT Article AB For about one year the time scales UTC (OCA) and UTC (TUG) were compared by means of GPS common-view and two-way satellite time transfer. At the end of the experiment, both links were independently ''calibrated'' by measuring the differential delays of the GPS receivers and the satellite Earth stations by transportation of one GPS receiver and one satellite terminal to the other site. The results obtained by the two methods differ by about 3 ns, but reveal a seasonal variation of about 8 ns which, most likely, is mainly the result of temperature-dependent delays in the GPS receiving equipment used. C1 SPACE RES INST,A-8010 GRAZ,AUSTRIA. OBSERV COTE AZUR,F-06130 GRASSE,FRANCE. BUR INT POIDS & MESURES,F-92312 SEVRES,FRANCE. NATL INST STAND & TECHNOL,BOULDER,CO 80303. USN OBSERV,WASHINGTON,DC 20392. LAB PRIMAIRE TEMPS & FREQUENCES,F-75014 PARIS,FRANCE. RP KIRCHNER, D (reprint author), GRAZ TECH UNIV,INFFELDGASSE 12,A-8010 GRAZ,AUSTRIA. NR 17 TC 10 Z9 10 U1 0 U2 0 PU BUREAU INT POIDS MESURES PI SEVRES CEDEX PA B1 PM PAVILLION DE BRETUEIL, F-92312 SEVRES CEDEX, FRANCE SN 0026-1394 J9 METROLOGIA JI Metrologia PD SEP PY 1993 VL 30 IS 3 BP 183 EP 192 DI 10.1088/0026-1394/30/3/006 PG 10 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MB323 UT WOS:A1993MB32300006 ER PT J AU LAVERDIERE, MG AF LAVERDIERE, MG TI ANOTHER VICTORY IN THE UNWINNABLE WAR OVER CIVIL PENALTIES - MAINE V DEPARTMENT OF THE NAVY SO MILITARY LAW REVIEW LA English DT Article RP LAVERDIERE, MG (reprint author), USN,JACKSONVILLE,FL, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU JUDGE ADVOCATE GENERALS SCHOOL PI CHARLOTTESVILLE PA US ARMY, CHARLOTTESVILLE, VA 22903-1781 SN 0026-4040 J9 MIL LAW REV JI Milit. Law Rev. PD FAL PY 1993 VL 142 BP 165 EP 180 PG 16 WC Law SC Government & Law GA PA228 UT WOS:A1993PA22800004 ER PT J AU TRENT, LK STEVENS, LT AF TRENT, LK STEVENS, LT TI SURVEY OF THE NAVY 3-TIERED OBESITY TREATMENT PROGRAM SO MILITARY MEDICINE LA English DT Article AB The Navy's diverse, three-tiered obesity treatment program is described. Level I (command-directed) programs rely primarily on group exercise to treat obesity; most level Il (outpatient counseling) and level III (6-week inpatient) programs are modeled on Overeaters Anonymous and devote substantial amounts of time to group discussion, behavior modification, and nutrition education. Lack of funding or staffing has prevented many level II facilities from conducting a weight-management program, however. Further research might explore the potential for level II to provide a cost-effective middle ground for obesity treatment. RP TRENT, LK (reprint author), USN,HLTH RES CTR,HLTH SCI & EPIDEMIOL RES DEPT,POB 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 9 Z9 9 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 SEP PY 1993 VL 158 IS 9 BP 614 EP 618 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA LX041 UT WOS:A1993LX04100014 PM 8233001 ER PT J AU CHANG, SW ALLISS, RJ RAMAN, S SHI, JJ AF CHANG, SW ALLISS, RJ RAMAN, S SHI, JJ TI SSM/I OBSERVATIONS OF ERICA IOP-4 MARINE CYCLONE - A COMPARISON WITH IN-SITU OBSERVATIONS AND MODEL SIMULATION SO MONTHLY WEATHER REVIEW LA English DT Article ID MULTICHANNEL MICROWAVE RADIOMETER; WATER; OCEAN AB Fields of rainfall rates, integrated water vapor (IWV), and marine surface wind speeds retrieved by the Special Sensor Microwave/Imager (SSM/I) during the intensive observational period 4 on 4 January 1989 of the Experiment on Rapidly Intensifying Cyclones over the Atlantic (ERICA) were analyzed. Subjectively analyzed and model-simulated frontal structures were used to examine the spatial relationship of the SSM/I observed fields to the rapidly intensifying storm and the associated fronts. Qualitative and quantitative comparisons of SSM/I retrievals with GOES imagery, conventional observations, and results produced from the Naval Research Laboratory's (NRL) limited-area numerical model were also made. SSM/I rainfall was found along the cold and warm fronts, with heavy precipitation within frontal bands. The spatial pattern and characteristics of SSM/I precipitation closely resembled those simulated by the model. Both the warm and the cold front were found to be located near the area of the strongest gradient in IWV. In the warm sector, areas of IWV greater than 40 mm were found, an amount supported by model simulations. Both SSM/I rain rate and IWV distribution were found to be useful in locating the cold and warm fronts. There was good agreement on the relationship of frontal locations to the precipitation patterns and IWV gradients. Most of the high-wind area near the storm center was obscured by clouds for marine surface wind retrieval. SSM/I-retrieved marine surface winds outside the cloud shield (flag 0) were compared to ship- and buoy-reported winds. It was found that the retrieved wind estimates were within 0-3 m s-1 of in situ observation over areas of slow wind shifts. The errors became larger in regions of rapid wind shifts. C1 N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI,RALEIGH,NC 27695. SCI APPLICAT INT CORP,MCLEAN,VA. RP CHANG, SW (reprint author), USN,RES LAB,CODE 7220,WASHINGTON,DC 20375, USA. NR 30 TC 17 Z9 17 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 SEP PY 1993 VL 121 IS 9 BP 2452 EP 2464 DI 10.1175/1520-0493(1993)121<2452:SOOEIM>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LU353 UT WOS:A1993LU35300002 ER PT J AU CHEN, JM HARR, PA AF CHEN, JM HARR, PA TI INTERPRETATION OF EXTENDED EMPIRICAL ORTHOGONAL FUNCTION (EEOF) ANALYSIS SO MONTHLY WEATHER REVIEW LA English DT Note ID PRINCIPAL COMPONENT ANALYSIS; OUTGOING LONGWAVE RADIATION; TROPICAL PACIFIC REGION; 40-50 DAY OSCILLATION; EXAMPLES; MONSOON; WINTER; SEA AB Application of an empirical orthogonal function (EOF) analysis to a data matrix that contains two or more variable fields has been referred to as extended EOF (EEOF) analysis. Coherence between individual features contained within one EEOF has been implied to represent interrelationships between the fields (in the case of a combination of different variables) or propagating features (in the case of the same field at different times). However, caution must be exercised in the interpretation of interrelationships within one EEOF because the derivation of the EEOFs is based on the optimization of the variance of every EEOF as an entity and may not indicate correlations among substructures within one EEOF. These types of problems associated with interpretation of EEOF analyses are highlighted through an analytic example and application to a dataset with known statistical properties. Although other multivariate analysis techniques such as singular value decomposition and canonical correlation analysis are being used with more frequency, it is important to highlight potential difficulties associated with the EEOF technique that has been an integral analysis tool in meteorological research. C1 USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-HP,MONTEREY,CA 93943. NR 23 TC 16 Z9 16 U1 0 U2 2 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 SEP PY 1993 VL 121 IS 9 BP 2631 EP 2636 DI 10.1175/1520-0493(1993)121<2631:IOEEOF>2.0.CO;2 PG 6 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LU353 UT WOS:A1993LU35300013 ER PT J AU HIRSCHBERG, PA FRITSCH, JM AF HIRSCHBERG, PA FRITSCH, JM TI ON UNDERSTANDING HEIGHT TENDENCY SO MONTHLY WEATHER REVIEW LA English DT Note ID CYCLONE EVENT; MODEL AB Top-down height tendency reasoning is explained and examined. This approach uses the assumption of a stratospheric level of insignificant dynamics (LID)-where height and pressure tendencies are considered negligible-to simplify the understanding of cyclone-scale hydrostatic height (pressure) tendency in the troposphere. Quasigeostrophic analytic model results confirm the existence of such a LID for scales less than approximately 5000 km. An examination of a height tendency equation with the LID assumption shows that there must be net integrated local warming (cooling) between the LID and any level below the LID where heights are falling (rising). The local temperature tendency, which from the thermodynamic equation results from advection, diabatic heating, and the product of vertical motion and static stability, reflects the combined actions of all thermodynamic and dynamic processes that together promote hydrostatic height change in isobaric coordinates. In particular, the important dynamic effects of mass-diverging secondary circulations are implicitly contained in the local temperature tendency. New observational evidence and analytic model simulations supporting the top-down approach for understanding height tendency are also provided. The analytic model simulations show that isolated layers of equivalent diabatic heating and temperature advection do not produce equivalent dynamic responses in the vertical-motion field and height tendency fields. This result is used to explain observations that temperature advections in the upper troposphere/lower stratosphere are associated with larger lower-tropospheric height tendencies than equivalent temperature advections in the lower troposphere. C1 PENN STATE UNIV,DEPT METEOROL,UNIV PK,PA 16802. RP HIRSCHBERG, PA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-HS,MONTEREY,CA 93943, USA. NR 18 TC 19 Z9 22 U1 0 U2 1 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 SEP PY 1993 VL 121 IS 9 BP 2646 EP 2661 DI 10.1175/1520-0493(1993)121<2646:OUHT>2.0.CO;2 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LU353 UT WOS:A1993LU35300016 ER PT J AU MITTLEMAN, J SWAN, L AF MITTLEMAN, J SWAN, L TI UNDERWATER INSPECTION FOR WELDING AND OVERHAUL SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Significant progress has been made in making underwater ultrasonic thickness gauging and magnetic particle inspections available to the fleet. Under sponsorship from the Naval Sea Systems Command, Director of Ocean Engineering, Underwater Ship Husbandry Division (NavSea 00C5), the Coastal Systems Station has developed complete hardware packages supporting these two nondestructive test methods, and has introduced them to military inspectors at a shore intermediate maintenance activity, a destroyer tender, and a naval shipyard. Performance trials conducted prior to taking the systems to the field have been accepted by NavSea, Ships' Concepts Group, Materials Subgroup, Metals Division (NavSea 5142) as evidence that these inspections can reliably be performed underwater. Avenues for certifying specially trained divers and inspectors are being developed; for the first time the Navy will have all of the elements in place for underwater inspections satisfying the requirements of Mil-Std-271 (Requirements for Nondestructive Testing Methods) and the Naval Ships' Technical Manual Chapter 074. Underwater ultrasonic thickness gauging has also been slated for use in the fleet, as data from laboratory and field trials have consistently shown that reliable results can be obtained by a team comprising a certified topside inspector and a diver. In tests performed at the Ship Repair Facility (SRF), Yokosuka, underwater readings were compared to those taken in dry dock by SRF inspectors, and independently by contract inspectors. On the basis of approximately 800 locations, differences between the data sets were found to be randomly distributed, with a standard deviation on the order of 0.02''. This level of accuracy is largely sufficient to distinguish plate which will need replacement during overhaul, or plate which is thick enough to weld on. RP MITTLEMAN, J (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,COASTAL SYST STN,PANAMA CITY,FL 32401, USA. NR 0 TC 2 Z9 2 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 SEP PY 1993 VL 105 IS 5 BP 37 EP 42 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA MA657 UT WOS:A1993MA65700002 ER PT J AU CORREDOR, EL AF CORREDOR, EL TI THE DECLINE OF MODERNISM - BURGER,P SO NEW GERMAN CRITIQUE LA English DT Book Review RP CORREDOR, EL (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TELOS PRESS LTD PI NEW YORK PA 431 E 12TH ST, NEW YORK, NY 10009 SN 0094-033X J9 NEW GER CRIT JI New Ger. Crit. PD FAL PY 1993 IS 60 BP 171 EP 179 DI 10.2307/488671 PG 9 WC Literary Theory & Criticism SC Literature GA NQ814 UT WOS:A1993NQ81400009 ER PT J AU CORREDOR, EL AF CORREDOR, EL TI THE INSTITUTIONS OF ART - BURGER,P, BURGER,C SO NEW GERMAN CRITIQUE LA English DT Book Review RP CORREDOR, EL (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TELOS PRESS LTD PI NEW YORK PA 431 E 12TH ST, NEW YORK, NY 10009 SN 0094-033X J9 NEW GER CRIT JI New Ger. Crit. PD FAL PY 1993 IS 60 BP 171 EP 179 DI 10.2307/488671 PG 9 WC Literary Theory & Criticism SC Literature GA NQ814 UT WOS:A1993NQ81400008 ER PT J AU WAX, JR BLAKEMORE, KJ AF WAX, JR BLAKEMORE, KJ TI FETAL BLOOD-SAMPLING SO OBSTETRICS AND GYNECOLOGY CLINICS OF NORTH AMERICA LA English DT Article ID IMMUNE THROMBOCYTOPENIC PURPURA; GROWTH-RETARDED FETUSES; PRENATAL-DIAGNOSIS; CONGENITAL TOXOPLASMOSIS; RHESUS ISOIMMUNIZATION; PARVOVIRUS INFECTION; PANCURONIUM-BROMIDE; INTRAHEPATIC VEIN; HEMOLYTIC-DISEASE; UMBILICAL-CORD C1 JOHNS HOPKINS UNIV,SCH MED,DEPT OBSTET & GYNECOL,DIV MATERNAL FETAL MED,BALTIMORE,MD 21205. RP WAX, JR (reprint author), USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA 23708, USA. NR 84 TC 2 Z9 2 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0889-8545 J9 OBSTET GYN CLIN N AM JI Obstet. Gynecol. Clin. N. Am. PD SEP PY 1993 VL 20 IS 3 BP 533 EP 562 PG 30 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA LZ381 UT WOS:A1993LZ38100010 PM 8278149 ER PT J AU HUANG, ET PAULLING, JR AF HUANG, ET PAULLING, JR TI SEA LOADS ON LARGE BUOYANT CARGO DURING OCEAN TRANSPORT SO OCEAN ENGINEERING LA English DT Article AB This paper presents a semi-empirical procedure for the evaluation of sea loads on large buoyant cargos during ocean transport by heavy lift ships. Theories and underlying assumptions used in the procedure are discussed. The procedure predicts kinematics of the cargo and waves, the occurrence of coupling between waves and cargo, and the coupling forces in time domain. Air gaps between the cargo and wave surface are traced on the basis of linear theories of ship motion and waves to detect the occurrence of couplings. The coupling process is then treated as a local problem in the.sense that it does not affect overall ship motion. The coupling forces are assumed to be a linear sum of buoyancy, Froude-Krylov force, added mass, and drag. The first two components are computed in a nearly exact method, whereas the latter components are approximated by empirical equations. The slamming force, which occurs only briefly at the moment of water entry, is computed separately. The required force coefficients are determined empirically. he underlying assumptions are verified with hydraulic model measurements, the results of which confirm the present approach for engineering applications. C1 UNIV CALIF BERKELEY,DEPT NAVAL ARCHITECTURE & OFFSHORE ENGN,BERKELEY,CA 94720. RP HUANG, ET (reprint author), USN,CIVIL ENGN LAB,PORT HUENEME,CA 93043, USA. NR 13 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 SEP PY 1993 VL 20 IS 5 BP 509 EP 527 DI 10.1016/0029-8018(93)90018-D PG 19 WC Engineering, Marine; Engineering, Civil; Engineering, Ocean; Oceanography SC Engineering; Oceanography GA LZ266 UT WOS:A1993LZ26600004 ER PT J AU SAIKU, JM STGERMAIN, HA MEIERS, JC AF SAIKU, JM STGERMAIN, HA MEIERS, JC TI MICROLEAKAGE OF A DENTAL AMALGAM ALLOY BONDING AGENT SO OPERATIVE DENTISTRY LA English DT Article AB Amalgambond (a 4-META derivative resin bond agent) was evaluated for its effectiveness in reducing microleakage compared to copal varnish and no lining agent in class 5 amalgam preparations restored with either an admix alloy (Dispersalloy) or a spherical alloy (Tytin). Teeth were thermocycled between 5 and 55-degrees-C with two 4-META/amalgam groups additionally aged in 37-degrees-C water for 30 days prior to thermocycling. Nonaged, 4-META/amalgam restorations showed significantly less microleakage (P < 0.05) at enamel and dentin margins compared to copal varnish or nonlined restorations. Within the 4-META groups, the 4-META/Dispersalloy restorations had significantly less microleakage than the 4-META/Tytin restorations at enamel margins. Microleakage in the aged 4-META/amalgam restorations was significantly greater at both the enamel and dentin margins than in the analogous nonaged groups. SEM evaluation of the 4-META lined restorations found internal cavity surfaces of the preparations to be sealed by the resin liner with separations and apparent microleakage occurring at the 4-META/amalgam interface. RP SAIKU, JM (reprint author), USN,NATL NAVAL DENT CTR,SCH DENT,COMPREHENS DENT PROGRAM,BETHESDA,MD 20889, USA. NR 0 TC 41 Z9 41 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 SEP-OCT PY 1993 VL 18 IS 5 BP 172 EP 178 PG 7 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LY951 UT WOS:A1993LY95100003 PM 8152986 ER PT J AU TURNER, CW MEIERS, JC AF TURNER, CW MEIERS, JC TI REPAIR OF AN AGED, CONTAMINATED INDIRECT COMPOSITE RESIN WITH A DIRECT, VISIBLE-LIGHT-CURED COMPOSITE RESIN SO OPERATIVE DENTISTRY LA English DT Article AB This study investigated the interfacial shear bond strength of a contaminated, aged, heat- and pressure-processed, indirect composite resin (Concept) repaired with a direct, visible-light-cured composite resin (Heliomolar). Concept samples were aged by thermocycling and contaminated in tobacco juice. The bonding surfaces were prepared by sanding with 500-grit sandpaper or air abrading with 50-micron aluminum oxide. Prepared Concept surfaces received one or more of the following intermediary resin treatments before the addition of Heliomolar: Heliobond, Special Bond 2, All-Bond system, All-Bond bonding agent, or no bonding agent, and they were immediately thermocycled. Air abrasion produced significantly higher bond strengths than sanding for all intermediary resin surface treatments. The All-Bond-treated Concept surfaces showed the highest interfacial bond strengths within the air abraded and sanded groups. Visual and SEM examination of fractured repair surfaces indicated adhesive failure within all treatment groups. RP TURNER, CW (reprint author), USN,SCH DENT,BETHESDA,MD 20889, USA. NR 0 TC 51 Z9 54 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 SEP-OCT PY 1993 VL 18 IS 5 BP 187 EP 194 PG 8 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LY951 UT WOS:A1993LY95100005 PM 8152988 ER PT J AU YORK, AK ARTHUR, JS AF YORK, AK ARTHUR, JS TI REASONS FOR PLACEMENT AND REPLACEMENT OF DENTAL RESTORATIONS IN THE UNITED-STATES-NAVY-DENTAL-CORPS SO OPERATIVE DENTISTRY LA English DT Article AB This study investigated the reasons for placement and replacement of dental restorations in the United States Navy Dental Corps. The relationship between restoration longevity and the reasons for replacement of restorations was also studied. Data on newly placed dental restorations were collected from restorative dentists working at 11 Naval Dental Clinics located throughout the United States. Participating dentists at each clinic were asked to collect data for all restorations they placed during a two-week period. Data on 4633 restorations were collected from 88 dentists. The most common reasons for placement of restorations varied by age category. Primary caries was the most common reason for patients 18-34 years of age, while noncarious reasons for placement were most common for patients 35 years of age and older. The most common reason for replacement of restorations was secondary caries. For all replacement reasons amalgam restorations had greater longevity than composite resin restorations. RP YORK, AK (reprint author), USN,NATL NAVAL DENT CTR,DENT RES INST,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 0 TC 34 Z9 35 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 SEP-OCT PY 1993 VL 18 IS 5 BP 203 EP 208 PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LY951 UT WOS:A1993LY95100007 PM 8152990 ER PT J AU KORENDYKE, CM SOCKER, DG AF KORENDYKE, CM SOCKER, DG TI MEASURED OPTICAL-PERFORMANCE OF 3 FABRY-PEROT INTERFEROMETERS FOR USE IN A TUNABLE ULTRAVIOLET FILTER SO OPTICAL ENGINEERING LA English DT Article DE TUNABLE ULTRAVIOLET FILTERS; FABRY-PEROT INTERFEROMETERS; SPECTROSCOPY AB A narrowband ultraviolet (UV) filter would allow the first monochromatic two-dimensional images of astrophysical plasmas to be obtained in UV emission lines. The high etendue and spectral resolving power of the Fabry-Perot (FP) interferometer make it an excellent candidate for use in a tunable UV filter, provided that adequate optical performance can be obtained. Laboratory measurements of three UV FP interferometers with progressively greater dielectric mirror reflectances are described. The measurements demonstrate the adequate reflectivity, absorption, and small-scale smoothness of currently available coatings and substrates for UV interferometry. The measurements are conducted at 228.8 nm utilizing a cadmium hollow cathode light source. The best performing interferometer has a finesse of 41 and maximum transmittance of 0.38 over a coating-performance-dominated 3-mm-diam subaperture and a finesse of 26 and maximum transmittance of 0.32 over a parabolic-defect-dominated 30-mm-diam aperture. This interferometer is well suited for use in a UV filter system. RP KORENDYKE, CM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4162K,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 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 SEP PY 1993 VL 32 IS 9 BP 2281 EP 2285 DI 10.1117/12.145387 PG 5 WC Optics SC Optics GA LW888 UT WOS:A1993LW88800038 ER PT J AU DUREE, GC SHULTZ, JL BEI, NY SALAMO, GJ SHARP, EJ WOOD, GL MONTGOMERY, S NEURGAONKAR, RR AF DUREE, GC SHULTZ, JL BEI, NY SALAMO, GJ SHARP, EJ WOOD, GL MONTGOMERY, S NEURGAONKAR, RR TI ENHANCING THE PHOTOREFRACTIVE EFFECT SO OPTICS COMMUNICATIONS LA English DT Article ID TIME AB The transient response for beam fanning in photorefractive tungsten bronze crystals with an applied electric field and a focused laser beam is studied. Response times on the order of 1 ms for an incident power of 1 mW observed for incident beams focused to a 30 mum diameter in the crystal. This improved response time is accomplished without the significant reduction in the magnitude of the photorefractive effect normally observed for focused beams. C1 USA,RES LAB,FT BELVOIR,VA 22060. USN ACAD,ANNAPOLIS,MD 21402. ROCKWELL INT CORP,CTR SCI,THOUSAND OAKS,CA 91360. RP DUREE, GC (reprint author), UNIV ARKANSAS,DEPT PHYS,FAYETTEVILLE,AR 72701, USA. NR 9 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD SEP 1 PY 1993 VL 101 IS 5-6 BP 397 EP 402 DI 10.1016/0030-4018(93)90737-P PG 6 WC Optics SC Optics GA LU631 UT WOS:A1993LU63100021 ER PT J AU HANSON, F BENDALL, C POIRIER, P AF HANSON, F BENDALL, C POIRIER, P TI GAIN MEASUREMENTS AND AVERAGE POWER CAPABILITIES OF CR-3+LISRALF(6) SO OPTICS LETTERS LA English DT Article ID LASER AB Gain for flash-lamp-pumped Cr:LiSrAlF6 and Cr:Li(Sr1-x,Cax)AlF6 from 790 to 1000 nm is reported. For Cr:LiSrAlF6 thermal fracture occurred at heat loadings of 4.5 W/cm and approximately 6 W/cm2 in the rod and slab geometry, respectively. Excited-state upconversion losses were evident in the slabs at high pump energy. RP HANSON, F (reprint author), USN,NAVAL COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,CODE 843,SAN DIEGO,CA 92152, USA. NR 9 TC 14 Z9 14 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD SEP 1 PY 1993 VL 18 IS 17 BP 1423 EP 1425 DI 10.1364/OL.18.001423 PG 3 WC Optics SC Optics GA LU851 UT WOS:A1993LU85100014 PM 19823402 ER PT J AU CATHERS, SJ ROAHEN, JO AF CATHERS, SJ ROAHEN, JO TI EVALUATION OF THE APICAL SEAL OF AMALGAM RETROFILLINGS WITH THE USE OF A ROOT-CANAL SEALER INTERFACE SO ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTICS LA English DT Article ID HIGH-COPPER AMALGAM; FILLINGS; INVITRO; LEAKAGE AB The apical seal of amalgam retrograde fillings was evaluated in 86 extracted teeth. The experimental groups included retrofillings of amalgam alone, amalgam with a cavity varnish interface, and amalgam with a root canal sealer interface. After a 3-month immersion of the teeth in Higgins ink and subsequent clearing process, statistical analysis of ink penetration measurements showed significantly less leakage (p < 0.001) around amalgam retrofillings when using a root canal sealer as an interface between the retrograde cavity preparation and the condensed amalgam. C1 USN,CTR DENT,GREAT LAKES,MI. NR 11 TC 6 Z9 6 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 1079-2104 J9 ORAL SURG ORAL MED O JI Oral Surg. Oral Med. Oral Pathol. Oral Radiol. Endod. PD SEP PY 1993 VL 76 IS 3 BP 343 EP 345 DI 10.1016/0030-4220(93)90265-6 PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LX162 UT WOS:A1993LX16200018 PM 8378048 ER PT J AU SILVA, MRG KESSLER, S ASCENSAO, JL AF SILVA, MRG KESSLER, S ASCENSAO, JL TI HEMATOPOIETIC ORIGIN OF HUMAN NATURAL-KILLER (NK) CELLS - GENERATION FROM IMMATURE PROGENITORS SO PATHOBIOLOGY LA English DT Article DE NK CELLS; BONE MARROW; CD34+ CELLS; CYTOKINES; HEMATOPOIETIC PROGENITORS ID HUMAN-BONE-MARROW; COLONY-STIMULATING FACTOR; PRECURSOR CELLS; GROWTH-FACTORS; CULTURE; INTERLEUKIN-3; DIFFERENTIATION; CD34+; LYMPHOCYTES; EXPRESSION AB Human natural killer (NK) cells originate from bone marrow, but little is known about NK cell progenitors and ontogeny. We studied the phenotype and functional activity of NK cells derived from highly purified human bone Human natural killer (NK) cells originate from bone marrow, but little is marrow CD34+ cells, which exhibited neither lyric activity nor expression of surface antigens characteristic of NK (CD56) or T (CD3) cells. However, when cultured with hematopoietic growth factors or feeder layers for up to 4 weeks, up to 86% functional CD56+ cells were seen in the absence of mature T cell development. CD56+ cells appeared in all cultures at 2 or 3 weeks, with the largest percentage in those exposed to IL-2. These studies demonstrated that NK cells arise 'in vitro' from immature bone marrow progenitors and also suggest a separate origin and differentiation pathway for NK and T cells. C1 UNIV NEVADA,SCH MED,DEPT MED,RENO,NV 89520. UNIV NEVADA,SCH MED,DEPT PATHOL,RENO,NV 89520. UNIV NEVADA,SCH MED,DEPT MICROBIOL & IMMUNOL,RENO,NV 89520. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD. OI Gomes da Silva, Maria/0000-0002-6993-2450 FU NIDDK NIH HHS [DK42026] NR 45 TC 7 Z9 7 U1 0 U2 0 PU KARGER PI BASEL PA ALLSCHWILERSTRASSE 10, CH-4009 BASEL, SWITZERLAND SN 1015-2008 J9 PATHOBIOLOGY JI Pathobiology PD SEP-DEC PY 1993 VL 61 IS 5-6 BP 247 EP 255 DI 10.1159/000163803 PG 9 WC Cell Biology; Pathology SC Cell Biology; Pathology GA MN877 UT WOS:A1993MN87700002 PM 7507682 ER PT J AU BROOK, I FRAIZER, EH AF BROOK, I FRAIZER, EH TI ROLE OF ANAEROBIC-BACTERIA IN LIVER-ABSCESSES IN CHILDREN SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Article DE LIVER; ABSCESS; ANAEROBIC BACTERIA ID PYOGENIC HEPATIC-ABSCESS; PERCUTANEOUS DRAINAGE; SUSCEPTIBILITY AB Aspirates from pyogenic liver abscesses obtained from 14 children were cultured for aerobic and anaerobic bacteria. Of 29 organisms that were recovered, 17 were anaerobic and 12 were aerobic or facultative. The predominant organisms were Peptostreptococcus spp. (5 isolates). Bacteroides fragilis group (4), Fusobacterium spp. (3) and Staphylococcus aureus (4). Aerobic or facultative bacteria only were recovered in five cases, anaerobic bacteria only in four and mixed aerobic and anaerobic bacteria in five. Anaerobic bacteria were recovered in liver abscesses that were associated with other infection in which these organisms were predominant (i.e. abdominal infection, abscesses). This study highlights the potential importance of anaerobic bacteria in pyogenic liver abscess. C1 USN HOSP,DEPT PEDIAT & INFECT DIS,BETHESDA,MD 20814. NR 27 TC 17 Z9 19 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 SEP PY 1993 VL 12 IS 9 BP 743 EP 746 DI 10.1097/00006454-199309000-00008 PG 4 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA LW912 UT WOS:A1993LW91200007 PM 8414802 ER PT J AU CLARK, DA DAY, R SEIDAH, N MOODY, TW CUTTITTA, F DAVIS, TP AF CLARK, DA DAY, R SEIDAH, N MOODY, TW CUTTITTA, F DAVIS, TP TI PROTEASE INHIBITORS SUPPRESS IN-VITRO GROWTH OF HUMAN SMALL-CELL LUNG-CANCER SO PEPTIDES LA English DT Article DE PROTEASE INHIBITORS; SMALL CELL LUNG CANCER; GASTRIN-RELEASING PEPTIDE; PEPTIDE PROCESSING; PROHORMONE CONVERTASE-1 AND CONVERTASE-2; GROWTH REGULATION ID GASTRIN-RELEASING PEPTIDE; BOMBESIN-LIKE PEPTIDES; C-MYC EXPRESSION; MEDULLARY CHROMAFFIN GRANULES; RECEPTOR ANTAGONISTS; BETA-ENDORPHIN; MESSENGER-RNAS; LINES; PROTEINS; GENE AB The effect of the protease inhibitors Bowman Birk inhibitor (BBI) and aprotinin on the in vitro clonal growth of two human small cell lung cancer (SCLC) cell lines was investigated. In addition, the effect of BBI on the growth factor processing of proGRP by SCLC cells and on mRNA levels for prohormone convertase 1 and 2 (PC1 and PC2) in SCLC cells was examined. The protease inhibitors BBI and aprotinin significantly decreased growth in both SCLC cell lines studied. In NCI-H345 cells, BBI appears to inhibit the processing of proGRP to GRP, as indicated by Western blot analysis. NCI-H345 cells, when treated with BBI (100 mug/ml), also showed highly significant decreases of mRNA for PC1 and PC2 of about 50%. These data suggest that proteases serve an important role in the growth regulation of SCLC and that inhibitors of these proteases may be potent suppressors of SCLC growth at the level of the gene. C1 UNIV ARIZONA, COLL MED, DEPT PHARMACOL, TUCSON, AZ 85724 USA. CLIN RES INST MONTREAL, MONTREAL H2W 1R7, QUEBEC, CANADA. USN HOSP, BETHESDA, MD 20814 USA. UNIV ARIZONA, ARIZONA CANC CTR, TUCSON, AZ 85724 USA. USN, NCI, MED ONCOL BRANCH, BETHESDA, MD 20814 USA. GEORGE WASHINGTON UNIV, MED CTR, DEPT BIOCHEM, WASHINGTON, DC 20037 USA. RI Seidah, Nabil/I-3596-2013; davis, thomas/F-3244-2015 OI Seidah, Nabil/0000-0001-6503-9342; davis, thomas/0000-0001-8465-4973 FU NCI NIH HHS [CA-44869, CA-53477]; NIDDK NIH HHS [DK-36289] NR 50 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0196-9781 EI 1873-5169 J9 PEPTIDES JI Peptides PD SEP-OCT PY 1993 VL 14 IS 5 BP 1021 EP 1028 DI 10.1016/0196-9781(93)90081-Q PG 8 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism; Pharmacology & Pharmacy SC Biochemistry & Molecular Biology; Endocrinology & Metabolism; Pharmacology & Pharmacy GA LZ783 UT WOS:A1993LZ78300022 PM 7506831 ER PT J AU MEYER, JR HOFFMAN, CA BARTOLI, FJ AF MEYER, JR HOFFMAN, CA BARTOLI, FJ TI NARROW-GAP HGTE-CDTE SUPERLATTICES SO PHYSICA B LA English DT Article ID MOLECULAR-BEAM EPITAXY; IONIZED-IMPURITY SCATTERING; VALENCE-BAND DISCONTINUITY; DIMENSIONAL ELECTRON-GAS; FIELD-EFFECT TRANSISTOR; MULTIPLE QUANTUM-WELLS; SUPER-LATTICE; CYCLOTRON RESONANCES; SCREENING LIMIT; TRANSPORT AB We review recent progress toward a comprehensive understanding of electronic processes in HgTe-CdTe superlattices. The unique band structure is analyzed, and its incorporation into new theories for transport and magneto-optical properties is discussed. The calculations are compared with recent experimental results, including the observation of enhanced electron mobilities in modulation-doped and setback-modulation-doped structures. Many of the intentionally doped superlattices with strong three-dimensional dispersion display prominent quantum Hall features, in some cases at magnetic fields for which there is no energy gap between the minibands for successive Landau levels. The band structure theory has been extended to the case of HgTe-CdTe quantum wires. It is predicted that due to the small free carrier masses, lateral confinement effects are far larger than those observed in wide-gap systems. A number of new phenomena are expected in narrow-gap nanostructures. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 71 TC 5 Z9 5 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD SEP PY 1993 VL 191 IS 1-2 BP 171 EP 189 PG 19 WC Physics, Condensed Matter SC Physics GA LX355 UT WOS:A1993LX35500018 ER PT J AU WALLIS, RF MARADUDIN, AA BORTOLANI, V EGUILUZ, AG QUONG, AA FRANCHINI, A SANTORO, G AF WALLIS, RF MARADUDIN, AA BORTOLANI, V EGUILUZ, AG QUONG, AA FRANCHINI, A SANTORO, G TI COMPARISON BETWEEN PHENOMENOLOGICAL AND PSEUDOPOTENTIAL FORCE-CONSTANTS FOR THE LATTICE-DYNAMICS OF AL SO PHYSICAL REVIEW B LA English DT Article ID PHONON-DISPERSION-CURVES; CONSISTENT-SCREENING CALCULATION; SURFACE PHONONS; 1ST PRINCIPLES; ALUMINUM; METAL AB In this paper we present a critical comparison of,calculations of phonon-dispersion curves for aluminum, based on pseudopotential and empirical force-constant methods. The former method is.based on both perturbative and nonperturbative evaluations of the total energy of the crystal. In the perturbative approach the total energy is evaluated to second order in the electron-ion interaction with a local pseudopotential. In the nonperturbative approach the electron-ion interaction is treated exactly using a non-local ab initio pseudopotential. In the empirical force-constant method the total energy is represented by a sum of two-body and three-body terms, the latter being restricted to interactions among triplets of nearest neighbors and of nearest and next-nearest neighbors. All models include physical mechanisms for ensuring the breakdown of the Cauchy relation. We show that in each method convergence of the calculated phonon frequencies requires the inclusion of long-range interactions. The radial-force constants obtained by the empirical and perturbative pseudopotential methods are very similar for the first three shells of neighbors. On the other hand, the tangential force constants differ markedly, a reflection of the different physical mechanisms that come into play in the various models in the establishment of equilibrium. C1 MONTANA STATE UNIV, DEPT PHYS, BOZEMAN, MT 59717 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV MODENA, DIPARTIMENTO FIS, I-41100 MODENA, ITALY. RP UNIV CALIF IRVINE, DEPT PHYS, IRVINE, CA 92717 USA. RI FRANCHINI, Anna/H-2464-2013 OI FRANCHINI, Anna/0000-0002-2701-1848 NR 35 TC 18 Z9 18 U1 0 U2 0 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 SEP 1 PY 1993 VL 48 IS 9 BP 6043 EP 6053 DI 10.1103/PhysRevB.48.6043 PG 11 WC Physics, Condensed Matter SC Physics GA LX348 UT WOS:A1993LX34800035 ER PT J AU KIM, CC SKELTON, EF OSOFSKY, MS LIEBENBERG, DH AF KIM, CC SKELTON, EF OSOFSKY, MS LIEBENBERG, DH TI PRESSURE-DEPENDENCE OF T(C) IN NDBA2CU3O7-DELTA TO 6 GPA SO PHYSICAL REVIEW B LA English DT Article ID TC; SYSTEM; SUPERCONDUCTIVITY AB The superconducting transition temperature T(c) for NdBa2Cu3O7-delta is measured as a function of pressure to 6 GPa. The pressure applied to these materials is directly measured near T(c), which is determined by monitoring the ac susceptibility as a function of temperature. It has been suggested that the apparent absence of superconductivity in PrBa2Cu3O7-delta is due, at least in part, to the interaction of 4f electrons of Pr3+ with the Cu-O plane. In light of this speculation, applying pressure to NdBa2Cu3O7-delta might be expected to increase the interaction of 4f electrons of Nd3+ with electrons in the Cu-O plane and reduce T(c). Our results indicate that T(c) increases with applied pressure. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP KIM, CC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 26 TC 24 Z9 24 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 1 PY 1993 VL 48 IS 9 BP 6431 EP 6435 DI 10.1103/PhysRevB.48.6431 PG 5 WC Physics, Condensed Matter SC Physics GA LX348 UT WOS:A1993LX34800085 ER PT J AU KRALL, J TING, A ESAREY, E SPRANGLE, P AF KRALL, J TING, A ESAREY, E SPRANGLE, P TI ENHANCED ACCELERATION IN A SELF-MODULATED-LASER WAKE-FIELD ACCELERATOR SO PHYSICAL REVIEW E LA English DT Article ID BEAT-WAVE ACCELERATOR; ELECTROMAGNETIC-WAVES; PLASMA INTERACTIONS; STIMULATED RAMAN; PULSES; GENERATION; RADIATION; SCATTERING AB An alternative configuration of the laser wake-field accelerator is proposed in which enhanced acceleration is achieved via resonant self-modulation of the laser pulse. This requires laser power in excess of the critical power for relativistic guiding and a plasma wavelength short compared to the laser pulse length. Relativistic and density wake effects strongly modulate the laser pulse at the plasma wavelength, resonantly exciting the plasma wave and leading to enhanced acceleration. RP USN, RES LAB, DIV PLASMA PHYS, BEAM PHYS BRANCH, WASHINGTON, DC 20375 USA. NR 32 TC 149 Z9 149 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 SEP PY 1993 VL 48 IS 3 BP 2157 EP 2161 DI 10.1103/PhysRevE.48.2157 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LY667 UT WOS:A1993LY66700070 ER PT J AU TALMAGE, G WALKER, JS BROWN, SH SONDERGAARD, NA AF TALMAGE, G WALKER, JS BROWN, SH SONDERGAARD, NA TI TRANSITION FROM STEADY TO PERIODIC LIQUID-METAL MAGNETOHYDRODYNAMIC FLOW IN A SLIDING ELECTRICAL CONTACT SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID MAGNETIC-FIELD; CURRENT COLLECTORS AB In homopolar motors and generators, large dc electric currents pass through the sliding electrical contacts between rotating copper disks (rotors) and static copper surfaces shrouding the rotor tips (stators). A liquid metal in the small radial gap between the rotor tip and concentric stator surface can provide a low-resistance, low-drag electrical contact. Since there is a strong magnetic field in the region of the electrical contacts, there are large electromagnetic body forces on the liquid metal. The primary, azimuthal motion consists of simple Couette flow, plus an electromagnetically driven flow with large extremes of the azimuthal velocity near the rotor corners. The secondary flow involves the radial and axial velocity components, is driven by the centrifugal force associated with the primary flow, and is opposed by the electromagnetic body force, so that the circulation varies inversely as the square of the magnetic-field strength. Three flow regimes are identified as the angular velocity OMEGA of the rotor is increased. For small OMEGA, the primary flow is decoupled from the secondary flow. As OMEGA increases, the secondary flow begins to convect the azimuthal-velocity peaks radially outward, which in turn changes the centrifugal force driving the secondary flow. At some critical value of OMEGA, the flow becomes periodic through the coupling of the primary and secondary flows. The azimuthal-velocity peaks begin to move radially in and out with an accompanying oscillation in the secondary-flow strength. C1 UNIV ILLINOIS,DEPT MECH & IND ENGN,URBANA,IL 61801. USN,CARDEROCK DIV,CTR SURFACE WARFARE,ANNAPOLIS,MD 21402. RP TALMAGE, G (reprint author), PENN STATE UNIV,DEPT MECH ENGN,UNIV PK,PA 16802, USA. NR 8 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 0899-8213 J9 PHYS FLUIDS A-FLUID PD SEP PY 1993 VL 5 IS 9 BP 2287 EP 2294 DI 10.1063/1.858532 PG 8 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA LU503 UT WOS:A1993LU50300024 ER PT J AU ROMERO, H GANGULI, G AF ROMERO, H GANGULI, G TI NONLINEAR EVOLUTION OF A STRONGLY SHEARED CROSS-FIELD PLASMA-FLOW SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID HYBRID-DRIFT INSTABILITY; RAYLEIGH-TAYLOR INSTABILITY; LARGE-LARMOR-RADIUS; MAGNETOTAIL BARIUM RELEASES; SHEET BOUNDARY-LAYER; L-H TRANSITION; MAGNETIC-FIELD; POLOIDAL ROTATION; ELECTRIC-FIELD; ANOMALOUS TRANSPORT AB A study is presented of the nonlinear evolution of a magnetized plasma in which a localized electron cross-field flow is present. The peak velocity of the flow is denoted by V0; L(E) represents the flow's shear scale length; and the regime rho(e) < L(E) < rho(i) is considered, where rho(i) and rho(e) denote the ion and electron Larmor radii, respectively. It is shown that if the shear frequency omega(s) = V0/L(E) is larger than the lower-hybrid frequency, omega(LH), then the system dynamics is dominated by the onset of the electron-ion-hybrid (EIH) mode which leads to the formation of coherent (vortexlike) structures in the electrostatic potential of the ensuing lower-hybrid waves. The wavelength of these structures is on the order of L(E), and correlates well with that predicted by the linear theory of the EIH mode. Since the characteristic wavelength is longer than rho(e), the corresponding phase velocity is low enough that there results significant direct resonant ion acceleration perpendicular to the confining magnetic field. When omega(s) > 3omega(LH), the system exhibits significant anomalous viscosity (typically an order of magnitude larger than that due to Coulomb collisions), which increases as the shear frequency is increased. As omega(s) is reduced below omega(LH), shear effects are no longer dominant and a smooth transition takes place in which the system dynamics is governed by the short wavelength (on the order of rho(e)) lower-hybrid drift instability. RP ROMERO, H (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 73 TC 28 Z9 28 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD SEP PY 1993 VL 5 IS 9 BP 3163 EP 3181 DI 10.1063/1.860653 PG 19 WC Physics, Fluids & Plasmas SC Physics GA LX855 UT WOS:A1993LX85500007 ER PT J AU UHM, HS AF UHM, HS TI A THEORY OF 2-STREAM INSTABILITY IN 2 HOLLOW RELATIVISTIC ELECTRON-BEAMS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GENERATION; POWER AB Stability properties of two-stream instability of two hollow electron beams are investigated. The equilibrium configuration consists of two intense relativistic hollow electron beams propagating through a grounded conducting cylinder. Analysis of the longitudinal two-stream instability is carried out within the framework of the linearized Vlasov-Maxwell equations for the equilibrium distribution function, in which beam electrons have a Lorentzian distribution in the axial momentum. Dispersion relation of the longitudinal two-stream instability is derived. Stability criteria from this dispersion relation indicate that the normalized velocity difference DELTAbeta between the beams should be within a certain range of value to be unstable. Growth rate of the instability is a substantial fraction of the real frequency, thereby indicating that the longitudinal two-stream instability is an effective means of beam current modulation. Transverse instability of hollow electron beams is also investigated. Dispersion relation of the coupled transverse oscillation of the beams is derived and numerical investigation of this dispersion relation is carried out. Growth rate of the kink instability is a substantial fraction of the diocotron frequency, which may pose a serious threat to the two-stream klystron. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 17 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD SEP PY 1993 VL 5 IS 9 BP 3388 EP 3398 DI 10.1063/1.860632 PG 11 WC Physics, Fluids & Plasmas SC Physics GA LX855 UT WOS:A1993LX85500029 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI WEAPONS DONT MAKE WAR - POLICY, STRATEGY, AND MILITARY TECHNOLOGY - GRAY,CS SO POLITICAL SCIENCE QUARTERLY LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ACAD POLITICAL SCIENCE PI NEW YORK PA 475 RIVERSIDE DRIVE, SUITE 1274, NEW YORK, NY 10115-1274 SN 0032-3195 J9 POLIT SCI QUART JI Polit. Sci. Q. PD FAL PY 1993 VL 108 IS 3 BP 566 EP 567 DI 10.2307/2151719 PG 2 WC Political Science SC Government & Law GA MA434 UT WOS:A1993MA43400024 ER PT J AU PECKERAR, MC MALDONADO, JR AF PECKERAR, MC MALDONADO, JR TI X-RAY-LITHOGRAPHY - AN OVERVIEW SO PROCEEDINGS OF THE IEEE LA English DT Article ID OPTICAL LITHOGRAPHY; TOPOGRAPHY; MASKS; RESOLUTION; MEMBRANES; RADIATION; DEVICES AB The fundamentals of X-ray lithography are reviewed. Issues associated with resolution, wafer throughput, and process latitude are discussed. X-ray lithography is compared with other lithographic technologies; future advancements, such as X-ray projection lithography, are described. It is shown that the major barrier to the near-term success of X-ray lithography is the requirement for a defect-free one-to-one mask which satisfies the stringent image-placement needs of submicrometer patterning. C1 IBM CORP,E FISHKILL FACIL,HOPEWELL JCT,NY 12533. RP PECKERAR, MC (reprint author), USN,RES LAB,INTERFACE SCI BRANCH,WASHINGTON,DC 20375, USA. NR 65 TC 22 Z9 22 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 0018-9219 J9 P IEEE JI Proc. IEEE PD SEP PY 1993 VL 81 IS 9 BP 1249 EP 1274 DI 10.1109/5.237534 PG 26 WC Engineering, Electrical & Electronic SC Engineering GA MB647 UT WOS:A1993MB64700006 ER PT J AU SHURTLEFF, D THOMAS, JR AHLERS, ST SCHROT, J AF SHURTLEFF, D THOMAS, JR AHLERS, ST SCHROT, J TI TYROSINE AMELIORATES A COLD-INDUCED DELAYED MATCHING-TO-SAMPLE PERFORMANCE DECREMENT IN RATS SO PSYCHOPHARMACOLOGY LA English DT Article DE COLD STRESS; TYROSINE; WORKING MEMORY; CATECHOLAMINES; RATS ID ENVIRONMENTAL-STRESS; BRAIN NOREPINEPHRINE; AGED MONKEYS; DOPAMINE; MEMORY; PHENYLALANINE; DEPRESSION; BEHAVIOR; CORTEX; SYSTEM AB Exposure to cold stress has been shown to impair short-term, or working, memory which may be related to a reduction in brain catecholamines. Administration of the catecholamine precursor tyrosine may alleviate a cold-stress-induced memory impairment by preventing a deficit in brain catecholamine levels. To test this hypothesis, eight rats performed a delayed matching-to-sample (DMTS) task at an ambient temperature of either 2-degrees-C (cold) or 22-degrees-C, following intraperitoneal administration of saline or tyrosine (50, 100 or 200 mg/kg). Rats administered saline prior to 22-degrees-C exposure demonstrated a characteristic delay gradient in which accuracy decreased as the delay interval between sample and comparison stimuli increased from 1 to 16 s. Consistent with previous research, and relative to 22-degrees-C exposure sessions, matching accuracy during 2-degrees-C exposure sessions was reduced, which is attributed to the effect of cold on short-term, or working, memory. In particular, during cold exposure sessions matching accuracy was significantly reduced at the longer delay intervals, relative to matching accuracy at 22-degrees-C. Additional analysis of cumulative matching errors within sessions showed that during exposure to cold, errors occurred at a constant rate throughout the session, indicating rats' performance was equally debilitated by the stressor over the entire session. During cold exposure sessions, the higher doses of 100 and 200 mg/kg tyrosine significantly improved overall matching accuracy relative to saline, but did not completely reverse the effect of cold exposure, as overall matching accuracy did not increase entirely to levels obtained at 22-degrees-C. A linear slope analysis of cumulative errors within cold sessions indicated that, relative to saline, the higher doses of tyrosine also significantly reduced errors, but did not reduce these errors to levels obtained during exposure to 22-degrees-C. It appears that supplemental tyrosine was effective in partially ameliorating the effects of cold stress on DMTS performance, possibly by preventing a cold-stress-induced reduction in brain catecholamine levels. RP SHURTLEFF, D (reprint author), USN,MED RES INST,THERMAL STRESS ADAPTAT PROGRAM,BETHESDA,MD 20889, USA. NR 26 TC 23 Z9 24 U1 1 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0033-3158 J9 PSYCHOPHARMACOLOGY JI Psychopharmacology PD SEP PY 1993 VL 112 IS 2-3 BP 228 EP 232 DI 10.1007/BF02244915 PG 5 WC Neurosciences; Pharmacology & Pharmacy; Psychiatry SC Neurosciences & Neurology; Pharmacology & Pharmacy; Psychiatry GA LW907 UT WOS:A1993LW90700010 PM 7871024 ER PT J AU HENDERSON, DR AF HENDERSON, DR TI THE EUROPEANIZATION OF THE UNITED-STATES LABOR-MARKET SO PUBLIC INTEREST LA English DT Article RP HENDERSON, DR (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU NATL AFFAIRS INC PI WASHINGTON PA 1112 16TH ST NW, SUITE 530, WASHINGTON, DC 20036 SN 0033-3557 J9 PUBLIC INTEREST JI Public Interest PD FAL PY 1993 IS 113 BP 66 EP 81 PG 16 WC Public Administration; Social Issues SC Public Administration; Social Issues GA MA852 UT WOS:A1993MA85200006 ER PT J AU KESKINEN, MJ CHATURVEDI, PK OSSAKOW, SL AF KESKINEN, MJ CHATURVEDI, PK OSSAKOW, SL TI LONG-TIME SCALE EVOLUTION OF HIGH-POWER RADIO-WAVE IONOSPHERIC HEATING .1. BEAM-PROPAGATION SO RADIO SCIENCE LA English DT Article ID F-REGION; STIMULATED SCATTERING; PLASMA INSTABILITIES; MODES AB The long time scale evolution, that is, for times long compared to an electron collision period of high-power radio wave ionospheric heating, is studied. Preliminary studies are made to model high-power radio wave propagation in an ionosphere containing a dynamically produced electron density cavity. We show that high-power radio wave-induced plasma density depletions in the F region ionosphere will convect and steepen in the direction perpendicular to the geomagnetic field due to ionosphere-thermosphere coupling effects. We treat high-power radio wave propagation including nonlinear self-induced thermal effects in the presence of a steepened density depletion. We find that the beam is distorted, shifts in direction, and changes its peak intensity due to nonlinear self-induced thermal effects. For weak beams, we find a decrease in beam intensity while for strong beams we observe an increase in beam intensity. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP KESKINEN, MJ (reprint author), USN,RES LAB,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 32 TC 6 Z9 6 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD SEP-OCT PY 1993 VL 28 IS 5 BP 775 EP 784 DI 10.1029/93RS00918 PG 10 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA MC134 UT WOS:A1993MC13400011 ER PT J AU BROPHY, TJ SHANKAR, PM BOBB, LC AF BROPHY, TJ SHANKAR, PM BOBB, LC TI FORMATION AND MEASUREMENT OF TAPERS IN OPTICAL FIBERS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SHAPE AB A simple fabrication method is described which is capable of producing physically repeatable biconical tapers in optical fibers. A resistively heated platinum wire furnace provides the heat with standard fiber-optic positioning equipment to secure the fiber. The method does not require computer control and has the advantages of low cost, fast sample turn-around time, and the ability to concatenate multiple tapers on a single fiber. Experimental results demonstrating repeatable taper formation and the wavelength filtering property of the tapers is shown. Issues of varying the taper shape are addressed and measurement methods of the physical and optical characteristics are presented. Limited control of the taper symmetry is discussed, and recommendations for enhancement at the cost of simplicity are included. C1 USN, CTR AIR WARFARE, DIV AIRCRAFT, WARMINSTER, PA 18974 USA. RP BROPHY, TJ (reprint author), DREXEL UNIV, DEPT ELECT & COMP ENGN, 32ND & CHESTNUT ST, PHILADELPHIA, PA 19104 USA. OI shankar, P/0000-0002-9719-9700 NR 12 TC 1 Z9 1 U1 0 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0034-6748 EI 1089-7623 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD SEP PY 1993 VL 64 IS 9 BP 2650 EP 2654 DI 10.1063/1.1143885 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA LX891 UT WOS:A1993LX89100042 ER PT J AU TRITTEN, JJ AF TRITTEN, JJ TI A NEW LOOK AT NAVAL ARMS-CONTROL SO SECURITY DIALOGUE LA English DT Article RP TRITTEN, JJ (reprint author), NAVAL POSTGRAD SCH,DEPT NATL SECUR AFFAIRS,MONTEREY,CA, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU SAGE PUBLICATIONS LTD PI LONDON PA 6 BONHILL STREET, LONDON, ENGLAND EC2A 4PU SN 0967-0106 J9 SECUR DIALOGUE JI Secur. Dialogue PD SEP PY 1993 VL 24 IS 3 BP 337 EP 348 DI 10.1177/0967010693024003011 PG 12 WC International Relations SC International Relations GA LZ398 UT WOS:A1993LZ39800010 ER PT J AU MILLER, AR VEGH, E AF MILLER, AR VEGH, E TI EXACT RESULT FOR THE GRAZING ANGLE OF SPECULAR REFLECTION FROM A SPHERE SO SIAM REVIEW LA English DT Note DE SELF-INVERSIVE POLYNOMIALS; ROOTS OF QUARTICS; SPECULAR REFLECTION ID COEFFICIENT AB An exact formula is given for the grazing angle of specular reflection from a sphere by displaying the zeros of a certain self-inversive quartic polynomial. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MILLER, AR (reprint author), GEORGE WASHINGTON UNIV,DEPT MATH,WASHINGTON,DC 20052, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1445 J9 SIAM REV JI SIAM Rev. PD SEP PY 1993 VL 35 IS 3 BP 472 EP 480 DI 10.1137/1035091 PG 9 WC Mathematics, Applied SC Mathematics GA LW524 UT WOS:A1993LW52400004 ER PT J AU WHITEHILL, BV MCDONALD, BA AF WHITEHILL, BV MCDONALD, BA TI IMPROVING LEARNING PERSISTENCE OF MILITARY PERSONNEL BY ENHANCING MOTIVATION IN A TECHNICAL TRAINING-PROGRAM SO SIMULATION & GAMING LA English DT Article DE DRILL; FIXED PAYOFF; GAME; LEARNING; MILITARY; MOTIVATION; PERSISTENCE; TECHNICAL; TRAINING; VARIABLE PAYOFF AB This study investigated the effect of motivational variables on task persistence and performance in Navy technical training. The motivation variables consisted of a context of either a game or a drill and payoff points that were either fixed or variable. This resulted in four groups: (a) game context with fixed payoff, (b) game context with variable payoff, (c) drill context with fixed payoff, and (d) drill context with variable payoff. In all experimental conditions, students were asked to solve 10 circuit problems. In the game context, students simulated the role of an electrician repairing circuits. Students moved a cursor around a maze representing a Navy ship's floor plan to locate and repair faulty circuits to prevent the ship from sinking. If water started to rise in the ship, students knew they needed to improve their performance. In the drill context students were presented with the same problems one at a time without the simulated game embellishments. In the fixed-payoff condition, each problem was worth a fixed number of points, regardless of the difficulty level selected by students. For each problem in the variable-payoff condition, points varied according to the difficulty level, types of help, and quits selected. Dependent variables were accuracy, persistence, time, level of difficulty, attempts, helps, and quits selected. The results show that a task-based simulation game combined with a variable payoff increased student persistence in selecting high levels of difficulty and induced a conservative behavior in relying on feedback helps. Further, the result was in the direction of improved performance for game with variable payoff. C1 SAN DIEGO STATE UNIV,DEPT PSYCHOL,SAN DIEGO,CA 92182. RP WHITEHILL, BV (reprint author), USN,CTR PERSONNEL RES & DEV,53335 RYNE RD,SAN DIEGO,CA 92152, USA. NR 14 TC 19 Z9 20 U1 0 U2 3 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1046-8781 J9 SIMULAT GAMING JI Simul. Gaming PD SEP PY 1993 VL 24 IS 3 BP 294 EP 313 DI 10.1177/1046878193243002 PG 20 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA LU402 UT WOS:A1993LU40200002 ER PT J AU BLANTON, CL SAWYER, RA FROHMAN, LP WARREN, FA AF BLANTON, CL SAWYER, RA FROHMAN, LP WARREN, FA TI MYASTHENIA-GRAVIS BY ANOTHER NAME - AN ELUSIVE IMPOSTOR - COMMENTS SO SURVEY OF OPHTHALMOLOGY LA English DT Discussion DE ELECTROMYOGRAPHY; MYASTHENIA-LIKE; ORBICULARIS WEAKNESS; PROCAINAMIDE; SUSTAINED UPGAZE ID EATON-LAMBERT SYNDROME; ACETYLCHOLINE-RECEPTOR; PROCAINAMIDE; COLCHICINE; NEUROPATHY; DIAGNOSIS; ANTIBODY AB A patient with procainamide-induced ''pseudo'' myasthenia gravis is presented. This clinical entity is discussed in terms of its clinical features, diagnosis, and treatment. Attention is directed to the importance of role of the ophthalmologist in making the diagnosis. C1 UNIV MED & DENT NEW JERSEY,NEWARK,NJ 07103. RP BLANTON, CL (reprint author), USN HOSP,DEPT OPHTHALMOL,SAN DIEGO,CA 92134, USA. NR 41 TC 3 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0039-6257 J9 SURV OPHTHALMOL JI Surv. Ophthalmol. PD SEP-OCT PY 1993 VL 38 IS 2 BP 219 EP 226 DI 10.1016/0039-6257(93)90105-G PG 8 WC Ophthalmology SC Ophthalmology GA MA693 UT WOS:A1993MA69300007 PM 8236002 ER PT J AU MACGREGOR, H GIORGIO, A VALERI, CR AF MACGREGOR, H GIORGIO, A VALERI, CR TI HUMAN PLATELETS COLLECTED WITH 2 INSTRUMENTS, STORED UP TO 24 HRS PRIOR TO FREEZING, AND FROZEN UP TO 2.3 YRS PRIOR TO TRANSFUSION SO TRANSFUSION LA English DT Meeting Abstract C1 BOSTON UNIV,SCH MED,USN,BLOOD RES LAB,BOSTON,MA 02118. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC BLOOD BANKS PI BETHESDA PA 8101 GLENBROOK RD, BETHESDA, MD 20814-2749 SN 0041-1132 J9 TRANSFUSION JI Transfusion PD SEP PY 1993 VL 33 IS 9 SU S BP S72 EP S72 PG 1 WC Hematology SC Hematology GA LZ447 UT WOS:A1993LZ44700277 ER PT J AU BOUDREAU, E SCHUSTER, B SANCHEZ, J NOVAKOWSKI, W JOHNSON, R REDMOND, D HANSON, R DAUSEL, L AF BOUDREAU, E SCHUSTER, B SANCHEZ, J NOVAKOWSKI, W JOHNSON, R REDMOND, D HANSON, R DAUSEL, L TI TOLERABILITY OF PROPHYLACTIC LARIAM(R) REGIMENS SO TROPICAL MEDICINE AND PARASITOLOGY LA English DT Article; Proceedings Paper CT SYMP ON MALARIA AND TRAVEL - PRACTICAL ASPECTS, AT THE 3RD CONF ON INTERNATIONAL TRAVEL MEDICINE CY APR, 1993 CL PARIS, FRANCE ID FALCIPARUM-MALARIA; ACUTE-PSYCHOSIS; MEFLOQUINE; DOXYCYCLINE; SYMPTOMS; EFFICACY AB Three hundred and fifty-nine US Marines participated in a randomized double-blind clinical trial to assess tolerance of two prophylactic mefloquine regimens [250 mg salt weekly (n = 157) or 250 mg daily for 3 days followed by 250 mg weekly (n = 46)] compared with 300 mg weekly chloroquine (n = 156) over a 12-week period. The study participants were seen daily for four days, then weekly for 11 weeks. On each visit, the subject answered two computerized questionnaires (a review of body systems and an evaluation of mood states), participated in a physician interview, and was administered medications under supervision. A random sample of each group was assigned to either pharmacokinetic sampling or to wear a wrist watch size computerized sleep monitor (actigraph). The frequencies of intercurrent illness and other concomitant medications were tabulated. End study mefloquine plasma levels were obtained on all study participants. The results obtained showed no compromise in function due to dizziness or incoordination in the mefloquine groups. Overall, both weekly mefloquine and loading dose mefloquine were well tolerated. Sleep disturbance and increased dream activity were detected in the mefloquine groups. Depressive feelings were noted in two to three times more individuals in the mefloquine groups than in the chloroquine group early in the course of the study, and resolved in the majority of subjects as tolerance developed. Steady state mefloquine plasma levels were attained rapidly with the loading dose regimen in four days versus seven weeks with weekly mefloquine. The mefloquine loading dose regimen should be considered as an option for short-term adult travelers or military personnel to chloroquine-resistant areas of the world. C1 WALTER REED ARMY INST RES,WASHINGTON,DC 20307. USA,ENVIRONM MED RES INST,NATICK,MA 01760. USN,HONOLULU,HI. RP BOUDREAU, E (reprint author), PHARMACEUT SYST INC,927 B N RUSSELL AVE,GAITHERSBURG,MD 20879, USA. NR 26 TC 69 Z9 69 U1 0 U2 0 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0177-2392 J9 TROP MED PARASITOL JI Trop. Med. Parasitol. PD SEP PY 1993 VL 44 IS 3 BP 257 EP 265 PG 9 WC Parasitology; Tropical Medicine SC Parasitology; Tropical Medicine GA MD343 UT WOS:A1993MD34300023 PM 8256107 ER PT J AU HARRISON, JA COLTON, RJ WHITE, CT BRENNER, DW AF HARRISON, JA COLTON, RJ WHITE, CT BRENNER, DW TI EFFECT OF ATOMIC-SCALE SURFACE-ROUGHNESS ON FRICTION - A MOLECULAR-DYNAMICS STUDY OF DIAMOND SURFACES SO WEAR LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL WORKSHOP ON MICROTRIBOLOGY ( IWM ) CY OCT 12-13, 1992 CL MORIOKA, JAPAN SP JAPANESE SOC TRIBOLOGISTS ID SIMULATIONS; ANISOTROPY; FORCES; FILMS AB We have examined by molecular dynamics simulations the friction which arises when two hydrogen-terminated diamond (111) surfaces are placed in sliding contact. In particular, the effects of load, crystallographic sliding direction, and substitution of surface hydrogen groups by methyl groups on the friction coefficient mu were investigated. For the hydrogen-terminated system, it is possible to have mu approximately equal to zero for certain sliding directions, while mu increases with increasing load for other sliding directions. However, when methyl groups are substituted for some surface hydrogen atoms mu generally increases with increasing load for all sliding directions examined. In this case, the directional anisotropy of mu is less than for the hydrogen-terminated system. RP HARRISON, JA (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 20 TC 61 Z9 62 U1 0 U2 10 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD SEP 1 PY 1993 VL 168 IS 1-2 BP 127 EP 133 DI 10.1016/0043-1648(93)90208-4 PG 7 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA LX985 UT WOS:A1993LX98500021 ER PT J AU PENG, MS JENG, BF CHANG, CP AF PENG, MS JENG, BF CHANG, CP TI FORECAST OF TYPHOON MOTION IN THE VICINITY OF TAIWAN DURING 1989-90 USING A DYNAMICAL MODEL SO WEATHER AND FORECASTING LA English DT Article AB A limited-area numerical model designed specifically for forecasting typhoon tracks has been operational at the Central Weather Bureau (CWB) in Taipei, Taiwan, since January 1990. It is a primitive equation model with nine sigma levels and a grid size of 70 km. The model domain of 8500 km x 6000 km is centered near Taiwan, and covers the western part of the Pacific Ocean and southeast China. A model-balanced vortex is bogussed into the analysis to initialize the forecast. To ensure the maintenance of the vortex circulation throughout the forecast period, artificial heating options are incorporated to supplement the Kuo-type cumulus parameterization in the model. The statistics of track errors for all forecast cases conducted during the development and operational checkout period (before December 1989) and during 1990, the first year of real-time operation, are reported. During the operational checkout period, 12 typhoons were forecasted, with an average 48-h track error of 415 km (62 forecast cases). For the 1990 season, there were 11 typhoons, with an average 48-h error of 392 km (63 forecast cases). The errors are compared with the One-Way Interactive Tropical Cyclone Model (OTCM), which is considered as the best long-term operational numerical track model for the western Pacific, using a homogeneous sample. The results indicate that the two models have similar average errors. The model had larger errors than the climatology and persistence (CLIPER) method. However, for all three typhoons with erratic movements, the model outperformed the CLIPER. The model was modified in several ways prior to the beginning of the 1990 season. The most beneficial modification appears to have been the enlargement of the forecast domain. However, the domain was still not large enough to cover important synoptic fields for Typhoon Marian, which was the westernmost typhoon forecasted by the model. Postoperational experiments were conducted and the forecast track of Typhoon Marian improved when the model domain was expanded to the west. Examination of the synoptic patterns indicates that the track forecast depends closely on the forecast of the subtropical high circulation. RP PENG, MS (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 0 TC 15 Z9 15 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD SEP PY 1993 VL 8 IS 3 BP 309 EP 325 DI 10.1175/1520-0434(1993)008<0309:FOTMIT>2.0.CO;2 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA QL520 UT WOS:A1993QL52000002 ER PT J AU LEE, TF ATWATER, S SAMUELS, C AF LEE, TF ATWATER, S SAMUELS, C TI SEA-ICE EDGE ENHANCEMENT USING POLAR-ORBITING ENVIRONMENTAL SATELLITE DATA SO WEATHER AND FORECASTING LA English DT Note AB The authors develop and discuss satellite image enhancements of sea ice boundaries to the north and west of Alaska. Using data from the NOAA Advanced Very High Resolution Radiometer (AVHRR), the authors illustrate how a pixel-by-pixel difference image of the two AVHRR solar channels can suppress the effects of optically thin cloud cover, revealing underlying detail. These difference images are compared to satellite ice products derived from the DMSP Special Sensor Microwave Imager (SSM/I). AVHRR enhancements have improved daily operational support to fishing, crabbing, scientific research, and especially oil exploration in the coastal waters of Alaska. In particular, the AVHRR solar difference image has greatly facilitated the preparation of daily maps depicting the major ice edge. During a two-week period in 1991 characterized by frequent cloudiness, analysts were able to prepare information locating the major ice edge 90 percent of the time using this product. The potential of SSM/I ice products, new in nonmilitary ice edge mapping support, is also discussed. RP LEE, TF (reprint author), USN,RES LAB,DIV MARINE METEOROL,MONTEREY,CA 93943, USA. NR 0 TC 1 Z9 1 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 SEP PY 1993 VL 8 IS 3 BP 369 EP 377 DI 10.1175/1520-0434(1993)008<0369:SIEEUP>2.0.CO;2 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA QL520 UT WOS:A1993QL52000008 ER PT J AU BURNS, MJ DELAHOUSSAYE, PR RUSSELL, SD GARCIA, GA CLAYTON, SR RUBY, WS LEE, LP AF BURNS, MJ DELAHOUSSAYE, PR RUSSELL, SD GARCIA, GA CLAYTON, SR RUBY, WS LEE, LP TI DEMONSTRATION OF Y1BA2CU3O7-DELTA AND COMPLEMENTARY METAL-OXIDE-SEMICONDUCTOR DEVICE FABRICATION ON THE SAME SAPPHIRE SUBSTRATE SO APPLIED PHYSICS LETTERS LA English DT Article ID EPITAXIAL YBA2CU3O7-DELTA AB We report the first fabrication of active semiconductor and high-temperature superconducting devices on the same substrate. Test structures of complementary metal-oxide-semiconductor transistors were fabricated on the same sapphire substrate as test structures of Y1Ba2Cu3O7-delta flux-flow transistors, and separately, Y1Ba2Cu3O7-delta superconducting quantum interference devices utilizing both biepitaxial and step-edge Josephson junctions. Both semiconductor and superconductor devices were operated at 77 K. The cofabrication of devices using these disparate yet complementary electronic technologies on the same substrate opens the door for the fabrication of true semiconductive/superconductive hybrid integrated circuits capable of exploiting the best features of each of these technologies. C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST & EVALUAT NRAD,SAN DIEGO,CA 92152. RP BURNS, MJ (reprint author), CONDUCTUS INC,969 W MAUDE AVE,SUNNYVALE,CA 94086, USA. RI Burns, Michael/D-2939-2011 OI Burns, Michael/0000-0001-9804-405X NR 11 TC 9 Z9 9 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 30 PY 1993 VL 63 IS 9 BP 1282 EP 1284 DI 10.1063/1.109758 PG 3 WC Physics, Applied SC Physics GA LU951 UT WOS:A1993LU95100042 ER PT J AU PFEIFFER, S SHASHIDHAR, R FARE, TL NACIRI, J ADAMS, J DURAN, RS AF PFEIFFER, S SHASHIDHAR, R FARE, TL NACIRI, J ADAMS, J DURAN, RS TI FERROELECTRICITY IN A LANGMUIR-BLODGETT MULTILAYER FILM OF A LIQUID-CRYSTALLINE SIDE-CHAIN POLYMER SO APPLIED PHYSICS LETTERS LA English DT Article ID INDUCED MOLECULAR TILT; C-STAR TRANSITION; BEHAVIOR; PHASE; MODE AB The observation of ferroelectric behavior in a Langmuir-Blodgett (LB) film of a liquid crystalline polymer is reported. It is established that a 30-layer film exhibits spontaneous polarization and electro-optic switching. The magnitude of the polarization of the LB film is found to be similar to that of the bulk material. The polarization current in the LB film follows the applied triangular wave field to higher frequencies as compared to the same material in a surface stabilized (sandwich) cell. C1 UNIV FLORIDA,CTR MACROMOLEC SCI,DEPT CHEM,GAINESVILLE,FL 32611. RP PFEIFFER, S (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 15 TC 13 Z9 13 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 AUG 30 PY 1993 VL 63 IS 9 BP 1285 EP 1287 DI 10.1063/1.109759 PG 3 WC Physics, Applied SC Physics GA LU951 UT WOS:A1993LU95100043 ER PT J AU PHILLIPS, L SINKOVITS, RS ORAN, ES BORIS, JP AF PHILLIPS, L SINKOVITS, RS ORAN, ES BORIS, JP TI THE INTERACTION OF SHOCKS AND DEFECTS IN LENNARD-JONES CRYSTALS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID MOLECULAR-DYNAMICS; INDUCED DETONATIONS; SIMULATION AB We examine, using computational molecular dynamics, shocks launched in two-dimensional crystals by a flying plate. The interaction of the shock with various lattice defects is observed, and is seen to create sites of rapidly growing, thermalized, hot fluid-like phases included within the crystal lattice. We hypothesize that these fluid-like regions are the sites of the initial chemical reactions leading to detonation in energetic materials, and that crystallographic defects therefore control the sensitivity of single-crystal high explosives to shock-initiation. The computations are carried out on the massively parallel CM-200 using a parallelized version of the MLG algorithm. RP PHILLIPS, L (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 28 TC 15 Z9 15 U1 1 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 AUG 30 PY 1993 VL 5 IS 35 BP 6357 EP 6376 DI 10.1088/0953-8984/5/35/003 PG 20 WC Physics, Condensed Matter SC Physics GA LV931 UT WOS:A1993LV93100003 ER PT J AU ROLAND, CM MILLER, JB MCGRATH, KJ AF ROLAND, CM MILLER, JB MCGRATH, KJ TI ORIGIN OF THE NEGATIVE EXCESS ENTHALPY IN POLY(VINYLETHYLENE) CIS-1,4-POLYISOPRENE BLENDS SO MACROMOLECULES LA English DT Note ID NUCLEAR-MAGNETIC-RESONANCE; MISCIBLE POLYMER BLEND; MAGIC-ANGLE; NMR; MISCIBILITY; 1,2-POLYBUTADIENE; THERMODYNAMICS; MIXTURES; DYNAMICS; SOLIDS C1 USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375. NR 33 TC 12 Z9 12 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 30 PY 1993 VL 26 IS 18 BP 4967 EP 4969 DI 10.1021/ma00070a036 PG 3 WC Polymer Science SC Polymer Science GA LV540 UT WOS:A1993LV54000036 ER PT J AU GEER, RE SHASHIDHAR, R THIBODEAUX, AF DURAN, RS AF GEER, RE SHASHIDHAR, R THIBODEAUX, AF DURAN, RS TI X-RAY DIFFUSE-SCATTERING STUDY OF STATIC UNDULATIONS IN MULTILAYER FILMS OF A LIQUID-CRYSTALLINE POLYMER SO PHYSICAL REVIEW LETTERS LA English DT Article ID SMECTIC FILMS; ROUGHNESS AB The first detailed x-ray study of static undulations in a liquid-crystal polymer is presented. By examining the nonspecular diffuse scattering from a 30-layer ferroelectric liquid-crystal polymer film, it is shown that the layer fluctuations are induced by the roughness of the film-substrate interface. This contrasts with the case of free-standing films wherein thermal fluctuations play the major role. C1 UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. RP GEER, RE (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 20 TC 36 Z9 36 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 30 PY 1993 VL 71 IS 9 BP 1391 EP 1394 DI 10.1103/PhysRevLett.71.1391 PG 4 WC Physics, Multidisciplinary SC Physics GA LU913 UT WOS:A1993LU91300026 ER PT J AU EWBANK, JD LUO, JY ENGLISH, JT LIU, RF FAUST, WL SCHAFER, L AF EWBANK, JD LUO, JY ENGLISH, JT LIU, RF FAUST, WL SCHAFER, L TI TIME-RESOLVED GAS ELECTRON-DIFFRACTION STUDY OF THE 193-NM PHOTOLYSIS OF 1,2-DICHLOROETHENES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MOLECULES; PHASE; CIS-1,2-DICHLOROETHYLENE; INSTRUMENTATION; SPECTROSCOPY; SCATTERING; PRODUCTS; ABINITIO; GLYCINE AB We have employed time-resolved gas electron diffraction. using an excite-and-probe technique developed on the basis of various precedents,1-2 for study of the 193-nm photodissociation of isomeric 1,2-dichloroethenes. The procedure3 involves a pulsed electron beam synchronous with photoexcitation and on-line electron diffraction intensity recording with a photodiode array. When the time delay between excitation and diagnostic electron scattering is 15 ns, only fragmentation and no cis-trans somerization is observed. When the time delay is several milliseconds, cis-trans isomerization is prevalent. This finding confirms the thesis that, because of faster intervening dissociative processes, cis-trans isomerization is not a primary photochemically driven unimolecular rearrangement of 193-nm irradiated dichloroethenes but hinges upon intermolecular collisions. C1 UNIV ARKANSAS,DEPT CHEM,FAYETTEVILLE,AR 72701. E CHINA UNIV CHEM TECHNOL,CHEM PHYS LAB,SHANGHAI 200237,PEOPLES R CHINA. NAVAL RES LAB,WASHINGTON,DC 20357. NR 46 TC 21 Z9 21 U1 0 U2 0 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 AUG 26 PY 1993 VL 97 IS 34 BP 8745 EP 8751 DI 10.1021/j100136a016 PG 7 WC Chemistry, Physical SC Chemistry GA LX146 UT WOS:A1993LX14600016 ER PT J AU SIMPSON, KM GEDRIDGE, RW HIGA, KT AF SIMPSON, KM GEDRIDGE, RW HIGA, KT TI SYNTHESIS AND CHARACTERIZATION OF NEW MONOMERIC DIALKYLINDIUM AMIDES SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article ID MOVPE AB A series of organoindium amido compounds have been prepared for use as dopants in the organometallic vapor phase epitaxy (OMVPE) of II-VI semiconductor materials. Thus, reaction of tBu2InCl or iPr2InCl with the appropriate lithium or sodium dialkyiamide afforded compounds of the type R2InNR2' (where R = (t)Bu, (i)Pr, and R' = Me, (i)Pr, SiMe3). Similarly, reaction of the N-lithiated derivative of NCMe2(CH2)3CMe2 gave iPr2InNCMe2(CH)3CMe2. All of the compounds are monomeric liquids, except for the compound where R = (t)Bu, R' = Me, which is a dimeric solid. The compounds have been characterized by H-1 and C-13 NMR, IR, molecular weight determination, and elemental analysis. In addition, properties relevant to the OMVPE process such as volatility and photosensitivity are presented and evaluated. C1 USN,CTR AIR WARFARE,DEPT RES,DIV WEAPONS,DIV CHEM,CHINA LAKE,CA 93555. NR 15 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD AUG 24 PY 1993 VL 456 IS 1 BP 31 EP 34 DI 10.1016/0022-328X(93)83312-J PG 4 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA LW114 UT WOS:A1993LW11400006 ER PT J AU GOLDING, TD DURA, JA WANG, WC VIGLIANTE, A MOSS, SC CHEN, HC MILLER, JH HOFFMAN, CA MEYER, JR AF GOLDING, TD DURA, JA WANG, WC VIGLIANTE, A MOSS, SC CHEN, HC MILLER, JH HOFFMAN, CA MEYER, JR TI SB/GASB HETEROSTRUCTURES AND MULTILAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID TRANSPORT-PROPERTIES; PBTE-BI; GROWTH AB We have successfully synthesized heterojunctions and elementary multilayered structures of the semimetal-semiconductor system Sb/GaSb using molecular beam and migration enhanced epitaxies. The study is motivated in part by the potential for producing an indirect narrow-gap semiconductor, in which a confinement-induced positive energy gap in the Sb layers will lead to highly attractive properties for nonlinear optical switches operating in the infrared. One may also be able to exploit the long mean free path in Sb (up to 2 mum) in studying quantum transport phenomena. X-ray diffraction confirms the ordered growth of GaSb/Sb/GaSb multilayers, and field-dependent magnetotransport measurements yield electron and hole mobilities greater-than-or-equal-to 3 X 10(4) cm2/V s in Sb thin films. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GOLDING, TD (reprint author), UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204, USA. RI Dura, Joseph/B-8452-2008 OI Dura, Joseph/0000-0001-6877-959X NR 13 TC 8 Z9 8 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 AUG 23 PY 1993 VL 63 IS 8 BP 1098 EP 1100 DI 10.1063/1.109792 PG 3 WC Physics, Applied SC Physics GA LU095 UT WOS:A1993LU09500028 ER PT J AU HARTMANN, B LEE, GF LEE, JD AF HARTMANN, B LEE, GF LEE, JD TI RELAXATION-TIMES IN POLYURETHANES CALCULATED USING ADDITIVE GROUP CONTRIBUTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,POLYMER SCI GRP,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 5 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201460 ER PT J AU CRONCE, DT BROWN, RP AF CRONCE, DT BROWN, RP TI FLUORINATION OF ACTIVATED CARBON SURFACES USING SEF4 AND SF4 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURF WAREFARE,DEPT SYST RES & TECHNOL,CHEM & BIOL SYST ANAL BRANCH,DAHLGREN DIV,DAHLGREN,VA 22448. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 9 EP FLUO PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32101512 ER PT J AU HICKMAN, JJ TESTOFF, MA STENGER, DA SPARGO, BJ RUDOLPH, AS CHU, CC AF HICKMAN, JJ TESTOFF, MA STENGER, DA SPARGO, BJ RUDOLPH, AS CHU, CC TI SURFACE CHARACTERIZATION OF BIOADSORBABLE POLYMERS MODIFIED WITH SELF-ASSEMBLED MONOLAYERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIO MOL SCI & ENGN,WASHINGTON,DC 20375. CORNELL UNIV,DEPT TEXT & APPAREL,ITHACA,NY 14853. SCI APPLICAT INT CORP,MCLEAN,VA 22102. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 11 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201023 ER PT J AU RAMAMURTHY, AC RYNTZ, RA HOLUBKA, JW HARTMANN, B AF RAMAMURTHY, AC RYNTZ, RA HOLUBKA, JW HARTMANN, B TI DYNAMIC-MECHANICAL CHARACTERIZATION OF THERMOPLASTIC OLEFINS (TPO) OVER 8 DECADES OF FREQUENCY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910. FORD MOTOR CO,DIV PLAST & TRIM PROD,DETROIT,MI 48239. SCI RES LABS,DEARBORN,MI. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 15 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201470 ER PT J AU FEDDERLY, JJ LEE, GF AF FEDDERLY, JJ LEE, GF TI AMINE-TERMINATED UREA MODIFIED EPOXIES FOR IMPROVED IMPACT PERFORMANCE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,POLYMER SCI GRP,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 16 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201471 ER PT J AU NGAI, KL SANTANGELO, PG ROLAND, CM AF NGAI, KL SANTANGELO, PG ROLAND, CM TI DYNAMICS OF POLYMER BLENDS AND POLYMER DILUENT MIXTURES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 32 EP MACR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201790 ER PT J AU MCGILL, RA ABRAHAM, MH ANDOVIANHAFTVAN, J DU, CM DIART, V WHITING, GS GRATE, JW AF MCGILL, RA ABRAHAM, MH ANDOVIANHAFTVAN, J DU, CM DIART, V WHITING, GS GRATE, JW TI THE CHARACTERIZATION OF POLYMERS BY INVERSE GLC USING A NEW SOLUTION EQN SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. GEO CTR,FT WASHINGTON,MD 20744. UNIV LONDON UNIV COLL,LONDON WC1H 0AJ,ENGLAND. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 38 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32100376 ER PT J AU FITZGERALD, J HITTLE, P AF FITZGERALD, J HITTLE, P TI A STERICALLY HINDERED TETRAAZAPORPHYRIN - SYNTHESIS, CHARACTERIZATION AND CATALYTIC PROPERTIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 62 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32101880 ER PT J AU WIJESURIYA, D LIGLER, F AF WIJESURIYA, D LIGLER, F TI A RAPID AND SENSITIVE FIBER OPTIC IMMUNOASSAY FOR MICROORGANISMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI,WASHINGTON,DC 20375. GEORGETOWN UNIV,DEPT BIOCHEM,WASHINGTON,DC 20007. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 65 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32100401 ER PT J AU TUPPER, KJ BRENNER, DW AF TUPPER, KJ BRENNER, DW TI MOLECULAR-DYNAMICS SIMULATIONS OF INTERFACIAL DYNAMICS IN SELF-ASSEMBLED MONOLAYERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. RI Brenner, Donald/D-1741-2009 NR 0 TC 0 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 72 EP COMP PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32101325 ER PT J AU RAPPOLI, BJ ROWLEY, DA AF RAPPOLI, BJ ROWLEY, DA TI SOLUTION EQUILIBRIA OF DIHYDROXYANTHRAQUIONE WITH LANTHANIDE METALS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. GEORGE WASHINGTON UNIV,DEPT CHEM,WASHINGTON,DC 20052. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 126 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32101945 ER PT J AU KEYER, RA BOYLE, ME COZZENS, RF AF KEYER, RA BOYLE, ME COZZENS, RF TI PREPARATION AND CHARACTERIZATION OF SAMARIUM PHTHALOCYANINE COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV MAT CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 140 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32101959 ER PT J AU GEORGE, RD BURROWS, VA MCMILLAN, PF AF GEORGE, RD BURROWS, VA MCMILLAN, PF TI AN IN-SITU VIBRATIONAL SPECTROSCOPIC STUDY OF THE RESPONSE OF PHTHALOCYANINE LANGMUIR-BLODGETT-FILMS TO NO2(G) SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. ARIZONA STATE UNIV,DEPT CHEM & BIOCHEM,TEMPE,AZ 85287. ARIZONA STATE UNIV,DEPT CHEM BIO & MAT ENGN,TEMPE,AZ 85287. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 166 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32101194 ER PT J AU TUPPER, KJ BRENNER, DW AF TUPPER, KJ BRENNER, DW TI ATOMISTIC SIMULATIONS OF FRICTIONAL WEAR IN SELF-ASSEMBLED MONOLAYERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. RI Brenner, Donald/D-1741-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 172 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201184 ER PT J AU MCGILL, RA ANDERSON, MR AF MCGILL, RA ANDERSON, MR TI SURFACE INTERFACIAL PROPERTIES OF SAW GAS SENSORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 174 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP321 UT WOS:A1993LP32101203 ER PT J AU GABER, BP PEEK, BM TURNER, DC BRANDOW, SL LEACHSCAMPAVIA, D AF GABER, BP PEEK, BM TURNER, DC BRANDOW, SL LEACHSCAMPAVIA, D TI FORMATION AND ENZYMATIC MODIFICATION OF A SILICON-BOUND LIPID MONOLAYER SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV WASHINGTON,CTR BIOENGN,SEATTLE,WA 98195. UNIV WASHINGTON,NATL ESCA & SURFACE ANAL CTR BIOMED PROBLEMS,SEATTLE,WA 98195. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 203 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201215 ER PT J AU MCMORROW, D MELINGER, JS LOTSHAW, WT AF MCMORROW, D MELINGER, JS LOTSHAW, WT TI LOCAL-STRUCTURE IN MOLECULAR LIQUIDS - FEMTOSECOND OPTICAL KERR DYNAMICS OF BENZENE AND PYRIDINE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. GE CO,CTR RES & DEV,SCHENECTADY,NY 12301. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 207 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32200959 ER PT J AU MEDHURST, LJ GARLAND, NL NELSON, HH AF MEDHURST, LJ GARLAND, NL NELSON, HH TI REACTIONS OF CFC-114 REPLACEMENT FLUOROCARBONS WITH OH - IMPLICATIONS FOR GLOBAL WARMING POTENTIAL SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 230 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32200982 ER PT J AU HO, T WYNNE, KJ AF HO, T WYNNE, KJ TI BLENDS OF A SILOXANE UREA URETHANE SEGMENTED COPOLYMER WITH AN IPDI-BASED POLYURETHANE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. USN,OFF RES,DIV CHEM,ARLINGTON,VA 22217. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 301 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201313 ER PT J AU MORIARTY, RM CHANY, CJ GILARDI, R AF MORIARTY, RM CHANY, CJ GILARDI, R TI CYCLOFUNCTIONALIZATION OF OLEFINIC CARBAMATES USING [HYDROXY(TOSYLOXY)IODO]BENZENE AND [HYDROXY(MESYLOXY)IODO]BENZENE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NAVAL RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20390. UNIV ILLINOIS,DEPT CHEM,CHICAGO,IL 60680. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 369 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32200543 ER PT J AU BUCKLEY, LJ RUBNER, MF AF BUCKLEY, LJ RUBNER, MF TI MORPHOLOGICAL-STUDIES OF POLYURETHANE DIACETYLENES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR AIR WARFARE,DIV AEROSP MAT,DIV AIRCRAFT,WARMINSTER,PA 18974. MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 22 PY 1993 VL 206 BP 429 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA LP322 UT WOS:A1993LP32201440 ER PT J AU COLLISON, AJ NEDOLUHA, GE AF COLLISON, AJ NEDOLUHA, GE TI PUMPING OF MAIN LINE OH MASERS IN THE CIRCUMSTELLAR ENVELOPES OF TYPE-I MIRA VARIABLES SO ASTROPHYSICAL JOURNAL LA English DT Article DE CIRCUMSTELLAR MATTER; MASERS; MOLECULAR PROCESSES; STARS, VARIABLES, OTHER ID MASS-LOSS RATES; DUST SHELLS; RADIATIVE-TRANSFER; OH/IR STARS; RED GIANTS; HYPERFINE-STRUCTURE; INFRARED-EMISSION; ALPHA-ORIONIS; SUPER-GIANTS; MODELS AB We have investigated the pumping of OH masers in the circumstellar envelopes of Mira variables. The location of the masing OH and the physical conditions within the circumstellar shell are approximated from a simple, spherically symmetric model of the mass loss. Parameters for the models are chosen to reproduce the conditions within Mira variables which show Type I (main line dominant) maser emission. The level populations of OH are calculated using the escape probability formalism and a modified Sobolev approximation. Pumping effects from direct stellar radiation, collisions, dust FIR emission, and FIR line overlaps are included. We find that throughout a seemingly reasonable range of conditions within the circumstellar shell, our models are dominated by 1612 MHz emission. Unless the conditions within the masing region are very different from those which we have assumed, we conclude that the FIR overlap mechanism alone cannot be responsible. for pumping the OH main lines. A possible pump mechanism which does produce Type I emission may be provided by the absorption of stellar NIR photons due to another molecule (possibly H2O) closer to the star. RP COLLISON, AJ (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7200,WASHINGTON,DC 20375, USA. NR 58 TC 16 Z9 16 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1993 VL 413 IS 2 BP 735 EP 749 DI 10.1086/173041 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LT200 UT WOS:A1993LT20000027 ER PT J AU KEENAN, FP FOSTER, VJ CONLON, ES AGGARWAL, KM WIDING, KG AF KEENAN, FP FOSTER, VJ CONLON, ES AGGARWAL, KM WIDING, KG TI S-XI LINE RATIOS IN THE SUN SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN, FLARES; SUN, SPECTRA ID EXTREME-ULTRAVIOLET SPECTRUM; SOLAR-FLARES; TRANSITIONS; STRENGTHS; SKYLAB; DIAGNOSTICS; EXCITATION; ANGSTROMS; S082A; BURST AB Theoretical S XI electron density sensitive emission-line ratios are presented for R1 = I(2s(2)2p2 1D-2s2p3 1D)/I(2s(2)2p2 P-3(2)-2s2p3 3S) = I(215.97 angstrom)/I(191.29 angstrom) and R2 = I(2s(2)2p2 1D-2s2p3 P-1)/I(2s(2)2p P-3(2)-2s2p3 3S) = I(190.37 angstrom)/I(191.29 angstrom). A comparison of these with solar flare observational data from the Naval Research Laboratory's S082A spectrograph on board Skylab reveals that the experimental ratios are generally much larger than expected from theory, which is probably due to blending of the S XI 215.97 angstrom line with Ni XVII 215.91 angstrom, and S XI 190.37 angstrom with an unidentified feature at a coincident wavelength. These observations indicate that photoexcitation of S XI by Fe XIII 191.26 angstrom is probably not an important process in the solar atmosphere under flare conditions, as it would lead to a significant enhancement of the S XI 191.29 angstrom line, and hence observed values of R1 and R2 that are smaller than theory predicts. C1 UNIV DELHI,DEPT PHYS & ASTROPHYS,DELHI 110007,INDIA. USN,E O HULBERT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 39 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 AUG 20 PY 1993 VL 413 IS 2 BP 826 EP 828 DI 10.1086/173049 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LT200 UT WOS:A1993LT20000035 ER PT J AU GREENHOUSE, MA FELDMAN, U SMITH, HA KLAPISCH, M BHATIA, AK BARSHALOM, A AF GREENHOUSE, MA FELDMAN, U SMITH, HA KLAPISCH, M BHATIA, AK BARSHALOM, A TI INFRARED CORONAL EMISSION-LINES AND THE POSSIBILITY OF THEIR LASER-EMISSION IN SEYFERT NUCLEI SO ASTROPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SMITHSONIAN INST,NATL AIR & SPACE MUSEUM,ASTROPHYS LAB,WASHINGTON,DC 20560. USN,RES LAB,SOLAR TERR RELATIONSHIPS BRANCH,WASHINGTON,DC 20375. USN,RES LAB,ARTEP INC,WASHINGTON,DC 20375. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1993 VL 413 IS 2 BP 834 EP 835 PN 1 PG 2 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LT200 UT WOS:A1993LT20000038 ER PT J AU ALBERT, CE BLADES, JC MORTON, DC LOCKMAN, FJ PROULX, M FERRARESE, L AF ALBERT, CE BLADES, JC MORTON, DC LOCKMAN, FJ PROULX, M FERRARESE, L TI A HIGH-RESOLUTION OPTICAL AND RADIO STUDY OF MILKY-WAY HALO GAS SO ASTROPHYSICAL JOURNAL LA English DT Meeting Abstract ID INTERSTELLAR ABSORPTION-LINES; DIRECTIONS; OBJECTS C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. HERZBERG INST ASTROPHYS,OTTAWA K1A 0R6,ON,CANADA. NATL RADIO ASTRON OBSERV,CHARLOTTESVILLE,VA 22903. NR 5 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1993 VL 413 IS 2 BP 836 EP 836 PN 1 PG 1 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LT200 UT WOS:A1993LT20000041 ER PT J AU PURCELL, WR GRABELSKY, DA ULMER, MP JOHNSON, WN KINZER, RL KURFESS, JD STRICKMAN, MS JUNG, GV AF PURCELL, WR GRABELSKY, DA ULMER, MP JOHNSON, WN KINZER, RL KURFESS, JD STRICKMAN, MS JUNG, GV TI OSSE OBSERVATIONS OF GALACTIC 511-KEV POSITRON-ANNIHILATION RADIATION - INITIAL PHASE-1 RESULTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXY, CENTER; GAMMA RAYS, OBSERVATIONS; ISM, GENERAL; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES ID CENTER REGION; CENTER DIRECTION; LINE EMISSION; CONTINUUM; ORIGIN AB The Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma-Ray Observatory (GRO) has performed numerous observations of the Galactic plane and Galactic center region to measure the distribution of Galactic 511 keV positron annihilation radiation and to search for time variability of the emission; the initial 511 keV line fluxes for the observations performed during the first 18 months of the GRO mission are presented. The 511 keV line flux for a typical Galactic center observation is (2.5 +/- 0.3) x 10(-4) gamma cm-2 s-1, where the quoted uncertainty represents the 1 sigma statistical uncertainty. No statistically significant time variability of the line flux has been observed; the 3 sigma upper limit to daily variations from the mean is 3 x 10(-4) gamma cm-2 s-1. The distribution of Galactic 511 keV positron annihilation radiation implied by the OSSE observations is discussed and compared with observations by other instruments. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. UNIV SPACE RES ASSOCIAT,WASHINGTON,DC 20024. RP PURCELL, WR (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Johnson, Neil/G-3309-2014 NR 36 TC 35 Z9 35 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1993 VL 413 IS 2 BP L85 EP L88 DI 10.1086/186965 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LT202 UT WOS:A1993LT20200008 ER PT J AU TAYLOR, M NELSON, MJ BLESS, RC DOLAN, JF ELLIOT, JL PERCIVAL, JW ROBINSON, EL VANCITTERS, GW AF TAYLOR, M NELSON, MJ BLESS, RC DOLAN, JF ELLIOT, JL PERCIVAL, JW ROBINSON, EL VANCITTERS, GW TI HIGH-SPEED ULTRAVIOLET PHOTOMETRY OF HD-60435 SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, INDIVIDUAL (HD-60435); STARS, OSCILLATIONS; STARS, PECULIAR ID OSCILLATING-AP STARS; SPECTRAL-ANALYSIS; TIME-SERIES; PECULIAR AB In this Letter, we present the first high-speed ultraviolet photometry of a oscillating Ap star, HD 60435. After removing known orbital effects related to the Hubble Space Telescope, we confirm the presence of a strong pulsation period at a frequency of 123.70 cycles per day. In addition, we find significant amplitude modulation of this frequency that we suggest could be the result of beating of multiple periodicities. In this context, we suggest evidence for the presence of four additional frequencies at nu = 120.56, 126.55, 149.49, and 221.03 cycles per day. Three of these frequencies correspond well to frequencies detected in optical observations of HD 60435. The fourth, at 149.49 cycles per day, if real, is a potentially new pulsation mode that has not been detected in ground-based observations of this star. The amplitude of the 123 cycles per day pulsation is significantly larger in the ultraviolet than it is in the blue. C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. MIT,DEPT EARTH & PLANETARY SCI,CAMBRIDGE,MA 02139. UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712. NATL SCI FDN,DIV ASTRON SCI,WASHINGTON,DC 20550. USN ACAD,DEPT AEROSP ENGN,ANNAPOLIS,MD 21402. RP TAYLOR, M (reprint author), UNIV WISCONSIN,DEPT ASTRON,MADISON,WI 53706, USA. NR 11 TC 5 Z9 5 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1993 VL 413 IS 2 BP L125 EP L128 DI 10.1086/186975 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LT202 UT WOS:A1993LT20200018 ER PT J AU LINDERS, JTM MONN, JA MATTSON, MV GEORGE, C JACOBSON, AE RICE, KC AF LINDERS, JTM MONN, JA MATTSON, MV GEORGE, C JACOBSON, AE RICE, KC TI SYNTHESIS AND BINDING-PROPERTIES OF MK-801 ISOTHIOCYANATES - (+)-3-ISOTHIOCYANATO-5-METHYL-10,11-DIHYDRO-5H-DIBENZO[A,D]CYCLOHEPTEN-5 ,10-IMINE HYDROCHLORIDE - A NEW, POTENT AND SELECTIVE ELECTROPHILIC AFFINITY LIGAND FOR THE NMDA RECEPTOR-COUPLED PHENCYCLIDINE BINDING-SITE SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID AMINO-ACID RECEPTORS; D-ASPARTATE ANTAGONISTS; GUINEA-PIG BRAIN; RAT-BRAIN; ANTICONVULSANT MK-801; SIGMA-RECEPTOR; RECOGNITION SITE; LABELS; INHIBITION; GLUTAMATE AB Three new site-directed irreversible (wash-resistant) ligands for the high-affinity phencyclidine (PCP) binding site associated with the N-methyl-D-aspartate (NMDA) receptor were synthesized and their binding characteristics were studied. (+)-3- And (+)-2-isothiocyanato-5-methyl-10,11-dihydro-5H-dibenzo[a,d]cyclohepten-5,10-imine hydrochloride ((+)-8a,b.HCl) were prepared in four steps from the corresponding nitro derivatives (+)-4a,b, which were obtained by nitration of (+)-3 (MK-801). In the same way the optical antipode (-)-8a.HCl was synthesized from (-)-3. At a concentration of 100 nM, the 3-isothiocyanate derivative (+)-8a irreversibly labeled approximately 50% of the (+)-[H-3]-3 binding sites, compared to 20 muM needed for its optical antipode (-)-8a and the 2-isothiocyanate(+)-8b. The apparent K(i) values for reversible inhibition of (+)-[H-3]-3 binding by (+)- and (-)-8a and (+)-8b were 37, 838, and 843 nM, respectively. In contrast, metaphit (1b) and etoxadrol m-isothiocyanate (2b), two previously reported irreversible ligands for the PCP binding site, label about 50% of the (+)-[H-3]-3 binding sites at 100 muM and 250 nM, respectively, with apparent K(i) values for reversible inhibition of 535 and 94 nM. Compound (+)-8a is also a selective affinity ligand, displaying little or no irreversible in vitro affinity at 100 muM for opioid, benzodiazepine, muscarinic, and dopamine receptors. At a 25 muM concentration, (+)-8a caused an irreversible 52% reduction of binding to sigma1-receptors. Compound (+)-8a is the most potent known electrophilic affinity label for the PCP binding site. Its potency and selectivity should enable it to be a valuable tool for the elucidation of the structure and function of the NMDA receptor-associated PCP binding site in the mammalian central nervous system. C1 NIDDKD, MED CHEM LAB, BETHESDA, MD 20892 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RI Fitzmaurice, Richard/C-1508-2008 FU NIAMS NIH HHS [5 F32 AR07980] NR 59 TC 5 Z9 5 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-2623 EI 1520-4804 J9 J MED CHEM JI J. Med. Chem. PD AUG 20 PY 1993 VL 36 IS 17 BP 2499 EP 2507 DI 10.1021/jm00069a008 PG 9 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA LU544 UT WOS:A1993LU54400008 PM 8355251 ER PT J AU KWON, YW FOX, PK AF KWON, YW FOX, PK TI UNDERWATER SHOCK RESPONSE OF A CYLINDER SUBJECTED TO A SIDE-ON EXPLOSION SO COMPUTERS & STRUCTURES LA English DT Article ID INFINITE ELEMENTS; BOUNDARY; FINITE AB The nonlinear dynamic response of a cylinder subjected to a side-on, far-field underwater explosion was studied using both numerical and experimental techniques. Both ends of the cylinder were closed with thick flat plates. An explosive charge was located 25 feet (7.62 m) from the cylinder on a line perpendicular to the cylinder axis and equidistant from the cylinder ends. Comparison of axial and hoop strains was made between the strain gage measurements and the numerical results at several different locations on the cylinder. Overall, the comparison was in a good agreement. However, it was found that there were asymmetric strain gage data from the experiment. With the postulation of cylinder rotation so that the charge was not located at center of the cylinder length, an additional numerical study was undertaken to investigate the effect of the rotation on the strain distributions. This study showed improvements of the numerical results compared to the experimental data. The numerical study indicated that the dynamic motion of the cylinder has an accordion mode, a breathing mode and a whipping mode. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 17 TC 39 Z9 51 U1 1 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7949 J9 COMPUT STRUCT JI Comput. Struct. PD AUG 17 PY 1993 VL 48 IS 4 BP 637 EP 646 DI 10.1016/0045-7949(93)90257-E PG 10 WC Computer Science, Interdisciplinary Applications; Engineering, Civil SC Computer Science; Engineering GA MA582 UT WOS:A1993MA58200009 ER PT J AU BENNETT, BR SHANABROOK, BV WAGNER, RJ DAVIS, JL WATERMAN, JR AF BENNETT, BR SHANABROOK, BV WAGNER, RJ DAVIS, JL WATERMAN, JR TI CONTROL OF INTERFACE STOICHIOMETRY IN INAS/GASB SUPERLATTICES GROWN BY MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID STRAINED-LAYER SUPERLATTICES; GA1-XINXSB/INAS SUPERLATTICES; RAMAN-SCATTERING AB The InAs/GaSb materials system, with different species for both cations and anions, allows one to envision the construction of heterojunctions with either InSb- or GaAs-like interfaces. As a result, this system provides a unique opportunity to explore the limits of interfacial control that can be achieved at the monolayer level by vapor phase growth techniques. Using migration-enhanced epitaxial techniques, we have prepared a series of InAs/GaSb superlattices with both types of interfaces. The large differences in bond lengths and vibrational properties of InSb and GaAs interfaces allow x-ray diffraction and Raman spectroscopy to be sensitive probes of interfacial structure. The x-ray and Raman measurements reveal that it is possible to grow superlattices with almost pure InSb-like or GaAs-like interfaces. RP BENNETT, BR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 16 TC 56 Z9 58 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 16 PY 1993 VL 63 IS 7 BP 949 EP 951 DI 10.1063/1.109854 PG 3 WC Physics, Applied SC Physics GA LT206 UT WOS:A1993LT20600033 ER PT J AU HEWETT, CA ZEIDLER, JR AF HEWETT, CA ZEIDLER, JR TI OHMIC CONTACTS TO EPITAXIAL AND NATURAL DIAMOND SO DIAMOND AND RELATED MATERIALS LA English DT Article; Proceedings Paper CT DIAMOND 1992 CY AUG 31-SEP 04, 1992 CL HEIDELBERG, GERMANY AB We have used the circular transmission line test structure of Reeves (Solid State Electron, 23 (1980) 487-490) in order to determine the specific contact resistance of various metals to semiconducting diamond. Sample types included highly doped epitaxial films on [100] and [110] type IIa substrates, type IIb diamonds 0.25 mm thick, and type IIb diamonds thinned to 0.05 mm in thickness, Metallizations tested include the carbide forming refractory metals Ti and Mo, as well as Al, Ni, Au, Pt, and Pd. Measured specific contact resistances ranged from 2 x 10(-5) for contacts to highly doped layers to 1 x 10(-2) OMEGA cm2 for contacts to natural bulk type IIb diamonds. Ohmic contact behavior was not observed for non-carbide forming metallizations on lightly doped type IIb diamond, either in the as-deposited state, or after annealing. RP HEWETT, CA (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST,SAN DIEGO,CA 92152, USA. NR 6 TC 10 Z9 10 U1 1 U2 13 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD AUG 16 PY 1993 VL 2 IS 10 BP 1319 EP 1321 DI 10.1016/0925-9635(93)90176-3 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA LR846 UT WOS:A1993LR84600001 ER PT J AU ZEIDLER, JR HEWETT, CA NGUYEN, R ZEISSE, CR WILSON, RG AF ZEIDLER, JR HEWETT, CA NGUYEN, R ZEISSE, CR WILSON, RG TI A DIAMOND DRIVER-ACTIVE LOAD PAIR FABRICATED BY ION-IMPLANTATION SO DIAMOND AND RELATED MATERIALS LA English DT Article AB Natural type IIa diamonds were implanted with boron at 77 K, using a multiple step, low temperature boron ion implantation procedure to produce an approximately uniformly doped p-type layer of about 200 nm thickness. This layer was used to fabricate metal insulator semiconductor field effect transistor devices operating in the depletion mode, with good uniformity from device to device. Two of the devices were used to fabricate a simple demonstration circuit with a voltage gain of two. C1 HUGHES RES LABS,MALIBU,CA 90265. RP ZEIDLER, JR (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST,SAN DIEGO,CA 92152, USA. NR 6 TC 4 Z9 4 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD AUG 16 PY 1993 VL 2 IS 10 BP 1341 EP 1343 DI 10.1016/0925-9635(93)90181-Z PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA LR846 UT WOS:A1993LR84600006 ER PT J AU YAO, RJ ALM, RA TRUST, TJ GUERRY, P AF YAO, RJ ALM, RA TRUST, TJ GUERRY, P TI CONSTRUCTION OF NEW CAMPYLOBACTER CLONING VECTORS AND A NEW MUTATIONAL CAT CASSETTE SO GENE LA English DT Note DE SITE-SPECIFIC MUTAGENESIS; RECOMBINANT DNA; MULTIPLE CLONING SITE; PCR; SHUTTLE VECTORS ID FLAGELLIN GENES; ESCHERICHIA-COLI; JEJUNI; EXPRESSION AB We have developed new Campylobacter shuttle vectors which are 6.5-6.8-kb plasmids carrying Campylobacter and Escherichia coli replicons, a multiple cloning site (MCS), the lacZalpha gene, oriT and either a kanamycin or chloramphenicol resistance-encoding gene (Km(R) or Cm(R)) from Campylobacter which functions in both hosts. These vectors can be mobilized efficiently from E. coli into C. jejuni or C. coli, and stably maintained in these hosts. Plasmids pRY107 and pRY108 carry a Km(R) marker and 17 unique cloning sites in two different orientations in lacZalpha, allowing easy blue/white color selection. Plasmids pRY111 and pRY112 contain a Cm(R) gene and 17 unique sites in both orientations. In addition, MCS are flanked by T7 and T3 late promoters and M13 forward and reverse primer sites, facilitating expression in T7 or T3 expression systems and sequence analysis. A Campylobacter CM(R) gene cartridge, bracketed by six restriction sites, has been developed for use in site-specific mutagenesis of Campylobacter genes. C1 USN,ENTER DIS PROGRAM,BETHESDA,MD 20814. UNIV VICTORIA,DEPT BIOCHEM & MICROBIOL,VICTORIA V8W 3P6,BC,CANADA. NR 16 TC 175 Z9 175 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-1119 J9 GENE JI Gene PD AUG 16 PY 1993 VL 130 IS 1 BP 127 EP 130 DI 10.1016/0378-1119(93)90355-7 PG 4 WC Genetics & Heredity SC Genetics & Heredity GA LT636 UT WOS:A1993LT63600017 PM 8344519 ER PT J AU HUBER, CA LUBIN, JA YANG, WH HUBER, TE AF HUBER, CA LUBIN, JA YANG, WH HUBER, TE TI SYNTHESIS AND OPTICAL-PROPERTIES OF DENSE SEMICONDUCTOR DIELECTRIC NANOCOMPOSITES SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article; Proceedings Paper CT 7TH LATIN-AMERICAN SYMP ON SURFACE SCIENCE ( SLAFS7-CIACSAI ) CY NOV 15-20, 1992 CL BARILOCHE, ARGENTINA ID GLASS AB We report on the Raman scattering spectra and fundamental absorption edge of dense semiconductor-insulator nanocomposites. These were synthesized by injection of the semiconducting melt into the channels of dielectric matrices. The Raman spectra exhibit shifts, broadenings, and asymmetries consistent with phonon confinement in nanometre-size semiconductor crystallites. Nanoscale networks of small effective mass semiconductors show evidence for electron confinement as manifested by a blue shift of the fundamental absorption edge. C1 CHINESE ACAD SCI,BEIJING,PEOPLES R CHINA. POLYTECH INST NEW YORK,BROOKLYN,NY. HOWARD UNIV,WASHINGTON,DC 20059. RP HUBER, CA (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910, USA. NR 4 TC 1 Z9 1 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD AUG 16 PY 1993 VL 5 SU 33A BP A337 EP A338 DI 10.1088/0953-8984/5/33A/123 PG 2 WC Physics, Condensed Matter SC Physics GA LV245 UT WOS:A1993LV24500124 ER PT J AU SCARDINO, DA HUBER, CA HUBER, TE AF SCARDINO, DA HUBER, CA HUBER, TE TI THE STATE OF INTERFACIAL MOLECULAR-HYDROGEN AS PROBED BY VIBRATIONAL ABSORPTION-SPECTROSCOPY SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article; Proceedings Paper CT 7TH LATIN-AMERICAN SYMP ON SURFACE SCIENCE ( SLAFS7-CIACSAI ) CY NOV 15-20, 1992 CL BARILOCHE, ARGENTINA ID H-2 AB We are interested in the optical properties of molecular hydrogen. We have evaluated isentropic-expansion paths on the pressure-temperature phase diagrams. The optimal initial conditions am derived. The prospect of detecting the resulting clusters using optical techniques is discussed, the ultimate goal being that of observing supercooled liquid hydrogen. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20904. RP SCARDINO, DA (reprint author), POLYTECH INST NEW YORK,DEPT PHYS,BROOKLYN,NY 11201, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD AUG 16 PY 1993 VL 5 SU 33A BP A207 EP A208 DI 10.1088/0953-8984/5/33A/064 PG 2 WC Physics, Condensed Matter SC Physics GA LV245 UT WOS:A1993LV24500065 ER PT J AU GRISCOM, DL GINGERICH, ME FRIEBELE, EJ AF GRISCOM, DL GINGERICH, ME FRIEBELE, EJ TI RADIATION-INDUCED DEFECTS IN GLASSES - ORIGIN OF POWER-LAW DEPENDENCE OF CONCENTRATION ON DOSE SO PHYSICAL REVIEW LETTERS LA English DT Article 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 concentrations of radiation-induced defect centers in insulating glasses. This insight permits detailed prediction of the postirradiation recovery curves, given just the empirical exponent of the power law, 0 < f < 1, and the experimental irradiation time, t(irrad). The time constant of the recovery is given by t(irrad)/(1 - f), independent of the order of the kinetics. We establish a microscopic model (radiolytic oxygen molecules) for the gamma-ray-induced absorption at 1.3 mum in our test fibers and infer a diffusion-limited bimolecular recombination process. RP GRISCOM, DL (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 16 TC 131 Z9 135 U1 2 U2 20 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 16 PY 1993 VL 71 IS 7 BP 1019 EP 1022 DI 10.1103/PhysRevLett.71.1019 PG 4 WC Physics, Multidisciplinary SC Physics GA LR901 UT WOS:A1993LR90100018 ER PT J AU AGBARIA, R FORD, H KELLEY, JA XIE, FM POLITI, P GREM, JL COONEY, DA MARQUEZ, VE ALLEGRA, CJ JOHNS, DG AF AGBARIA, R FORD, H KELLEY, JA XIE, FM POLITI, P GREM, JL COONEY, DA MARQUEZ, VE ALLEGRA, CJ JOHNS, DG TI MEASUREMENT OF CYCLOPENTENYL CYTOSINE 5'-TRIPHOSPHATE IN-VITRO AND IN-VIVO BY MULTIDIMENSIONAL HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID ANTITUMOR C1 NCI,DIV CANC TREATMENT,CLIN ONCOL PROGRAM,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. RP AGBARIA, R (reprint author), NCI,DIV CANC TREATMENT,DEV THERAPEUT PROGRAM,MED CHEM LAB,BLDG 37-5B22,BETHESDA,MD 20892, USA. NR 13 TC 12 Z9 12 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 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD AUG 15 PY 1993 VL 213 IS 1 BP 90 EP 96 DI 10.1006/abio.1993.1390 PG 7 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA LR462 UT WOS:A1993LR46200015 PM 8238887 ER PT J AU NEWMAN, RA PETERSON, B DAVEY, FR BRABYN, C COLLINS, H BRUNETTO, VL DUGGAN, DB WEISS, RB ROYSTON, I MILLARD, FE MILLER, AA BLOOMFIELD, CD AF NEWMAN, RA PETERSON, B DAVEY, FR BRABYN, C COLLINS, H BRUNETTO, VL DUGGAN, DB WEISS, RB ROYSTON, I MILLARD, FE MILLER, AA BLOOMFIELD, CD TI PHENOTYPIC MARKERS AND BCL-1 GENE REARRANGEMENTS IN B-CELL CHRONIC LYMPHOCYTIC-LEUKEMIA - A CANCER AND LEUKEMIA GROUP-B STUDY SO BLOOD LA English DT Article ID T(11-14) CHROMOSOME-TRANSLOCATION; NON-HODGKINS-LYMPHOMAS; T-CELLS; EXPRESSION; CLASSIFICATION; CD11C; DIFFERENTIATION; IDENTIFICATION; DETERMINANTS; BREAKPOINT C1 UNIV CALIF SAN DIEGO,CTR CANC,DEPT MED,LA JOLLA,CA 92093. DUKE UNIV,MED CTR,CALGB STAT OFF,DURHAM,NC 27710. SUNY HLTH SCI CTR,DEPT PATHOL,SYRACUSE,NY. ROSWELL PK CANC INST,DEPT MED,BUFFALO,NY. WALTER REED ARMY MED CTR,DEPT MED,WASHINGTON,DC 20307. USN HOSP,DEPT MED,SAN DIEGO,CA 92134. UNIV TENNESSEE CTR HLTH SCI,DEPT MED,MEMPHIS,TN 38163. FU NCI NIH HHS [CA21060-15, CA26806-12, CA37027-09] NR 31 TC 74 Z9 74 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD AUG 15 PY 1993 VL 82 IS 4 BP 1239 EP 1246 PG 8 WC Hematology SC Hematology GA LT742 UT WOS:A1993LT74200025 PM 8102560 ER PT J AU WELCH, BL YOUNG, FC GRIEM, HR AF WELCH, BL YOUNG, FC GRIEM, HR TI TEMPERATURE-MEASUREMENTS OF A NEON Z-PINCH PLASMA SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID X-RAY RESPONSE; RECOMBINATION RATES; PHOTOGRAPHIC FILMS; IONIZATION; IONS AB A neon Z-pinch plasma, appropriate for sodium/neon photopumping experiments, is studied in detail using temporally, spatially, and spectrally resolved measurements of Ne VII, Ne VIII, and Ne IX emissions. The neon is imploded with a 1 mus rise time, 150-180 kA peak current pulse. Two successive implosions are identified. The first implosion produces a 1-mm-diam plasma with an electron density of 9 X 10(19) cm-3 and a temperature of 200 eV. The second implosion produces a larger diameter (3.5 mm), less dense (7 X 10(18) cm-3) plasma with a temperature of 100 eV. A 70% Ne IX ground-state population at the second implosion is deduced from the measurements. C1 UNIV MARYLAND,COLL PK,MD 20742. RP WELCH, BL (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 18 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 AUG 15 PY 1993 VL 74 IS 4 BP 2260 EP 2267 DI 10.1063/1.354709 PG 8 WC Physics, Applied SC Physics GA LT183 UT WOS:A1993LT18300017 ER PT J AU SWANEKAMP, SB STEPHANAKIS, SJ GROSSMANN, JM WEBER, BV KELLOGG, JC OTTINGER, PF COOPERSTEIN, G AF SWANEKAMP, SB STEPHANAKIS, SJ GROSSMANN, JM WEBER, BV KELLOGG, JC OTTINGER, PF COOPERSTEIN, G TI CHARGED-PARTICLE FLOW IN PLASMA-FILLED PINCHED-ELECTRON-BEAM DIODES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ION DIODE; OPENING SWITCH; SIMULATIONS; SHEATHS AB Plasma-filled pinched-electron-beam diode experiments have been performed on the Gamble II (1.5 MV, 800 kA, 60 ns) pulsed power generator at Naval Research Laboratory. These plasma-filled diode (PFD) experiments show three phases of behavior: a low impedance phase followed by a phase of rapidly increasing impedance that culminates in a relatively constant vacuum impedance phase. The duration of the low impedance phase as well as the final operating impedance depends on the prefill plasma density. The charged particle flow in the PFD is studied with one-dimensional (1-D) and two-dimensional (2-D) simulation models. These simulation models show the formation of growing sheaths at both electrodes during the low impedance phase. The end of the low impedance phase in the simulations coincides with the two sheaths meeting in the center of the anode-cathode (A-K) gap. Based on these observations, an analytic model was developed that treats the low impedance phase as symmetric bipolar sheaths. The analytical model adequately predicts the duration of the low impedance phase predicted by the 1-D simulation model. Differences between the bipolar model and the experiments or 2-D simulations can be explained in terms of magnetized sheaths which enhance the ion current over the bipolar level and cause the sheath to grow faster than the bipolar model. During the rapidly increasing impedance phase, the simulations show that the cathode sheath quickly expands to completely fill the A-K gap. At this time, charged particle flow in the simulation models are consistent with the vacuum gap spacing. Experimentally, the higher density, longer conduction time, PFD shots exhibited a significantly lower final impedances than predicted by 2-D simulations. This difference is probably caused by expanding electrode surface plasmas produced by the interaction of the plasma source with one or both electrode surfaces. RP SWANEKAMP, SB (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 36 TC 6 Z9 7 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 AUG 15 PY 1993 VL 74 IS 4 BP 2274 EP 2286 DI 10.1063/1.354711 PG 13 WC Physics, Applied SC Physics GA LT183 UT WOS:A1993LT18300019 ER PT J AU KROWNE, CM BLAKEY, PA AF KROWNE, CM BLAKEY, PA TI SUBMILLIMETER-WAVE LOW-TEMPERATURE ADMITTANCE OF N-GAAS AND N-INP DIODE STRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TRANSPORT AB Numerical simulation results for n+nn+ GaAs and InP diode structures in the 1-5 THz frequency range are presented. Cryogenic temperatures from 4 through about 77 K as well as some cases above liquid-nitrogen temperature are examined to obtain the two-terminal admittance. Earlier work has suggested possible negative conductivity at or below 4.2 K, but nothing consistent above 77 K. Implications of the Monte Carlo data for generation of submillimeter waves at intermediate lattice temperatures between 4 and 60 K are discussed for GaAs. Furthermore, numerical results are obtained at elevated lattice temperatures (200 and 300 K) to form a more complete view of transport in InP. The GaAs and InP results strongly suggest negative conductance behavior will be found below 20 K. C1 SILVACO,SANTA CLARA,CA 95054. RP KROWNE, CM (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,MICROWAVE TECHNOL BRANCH,CODE 68503,WASHINGTON,DC 20375, USA. NR 6 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 15 PY 1993 VL 74 IS 4 BP 2633 EP 2637 DI 10.1063/1.354654 PG 5 WC Physics, Applied SC Physics GA LT183 UT WOS:A1993LT18300070 ER PT J AU XIE, H WANG, WI MEYER, JR HOFFMAN, CA BARTOLI, FJ AF XIE, H WANG, WI MEYER, JR HOFFMAN, CA BARTOLI, FJ TI NORMAL-INCIDENCE ELECTROABSORPTION IN GA1-XALXSB/ALSB L-VALLEY QUANTUM-WELLS FOR 3-5 MU-M OPTICAL MODULATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INTERSUBBAND ABSORPTION; ELECTRIC-FIELD; INFRARED DETECTION; SUPERLATTICES; BAND; DEPENDENCE; SWITCH AB Theoretical investigations are presented of the electric-field dependence of normal-incidence interconduction subband absorption in Ga1-xAlxSb/AlSb L-valley quantum wells. Under an applied electric field of 50 kV/cm, a blue shift of the absorption peak from 4.94 to 4.82 mum was found in a Ga0.7Al0.3Sb/AlSb structure with well width of 25 angstrom. The ability to absorb normally incident light and to achieve significant Stark shifts with bias makes the Ga1-xAlxSb/AlSb L-valley system an attractive choice for the 3-5 mum vertical optical modulators. C1 USN,RES LAB,WASHINGTON,DC 20375. RP XIE, H (reprint author), COLUMBIA UNIV,DEPT ELECT ENGN,NEW YORK,NY 10027, USA. NR 24 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 AUG 15 PY 1993 VL 74 IS 4 BP 2810 EP 2812 DI 10.1063/1.354630 PG 3 WC Physics, Applied SC Physics GA LT183 UT WOS:A1993LT18300096 ER PT J AU SELTZER, MD GRUBER, JB HILLS, ME QUARLES, GJ MORRISON, CA AF SELTZER, MD GRUBER, JB HILLS, ME QUARLES, GJ MORRISON, CA TI MULTISITE OPTICAL-SPECTRA AND ENERGY-LEVELS OF TRIVALENT THULIUM IONS IN YTTRIUM SCANDIUM GALLIUM GARNET SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GROWTH AB Intrinsic structural disorder in scandium-substituted garnets, attributed to mixed occupancy o certain sites in the crystal lattice by different cations, has direct consequences for the optical spectra of rare-earth activator ions dispersed over multiple sites. In trivalent thulium-doped yttrium scandium gallium garnet (Tm3+:YSGG), site-selective laser excitation spectra reveal the presence of Tm3+ ions in regular D2 sites, disturbed regular sites, and in octahedral C3i sites. Absorption spectra obtained at 4 K between 0.26 and 1.85 mum are broader than those observed in more-ordered crystal hosts and include structure attributed to Tm3+ ions in sites of other than D2 symmetry. A crystal-field splitting calculation was carried out in which a parametrized Hamiltonian (including Coulombic, spin-orbit, and crystal-field terms for Tm3+ ions in D2 symmetry) was diagonalized for all manifolds of the Tm3+ (4f12) configuration. The rms deviation between 52 experimental and calculated Stark levels of Tm3+ in regular D2 sites was 5 cm-1. C1 SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192. USN,RES LAB,ELECTROOPT TECHNOL BRANCH,WASHINGTON,DC 20375. USA,ADELPHI LAB COMMAND,HARRY DIAMOND LABS,ADELPHI,MD 20783. RP SELTZER, MD (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 17 TC 16 Z9 16 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 15 PY 1993 VL 74 IS 4 BP 2821 EP 2829 DI 10.1063/1.354633 PG 9 WC Physics, Applied SC Physics GA LT183 UT WOS:A1993LT18300099 ER PT J AU COOK, RM BURKE, BJ BUCHHAGEN, DL MINNA, JD MILLER, YE AF COOK, RM BURKE, BJ BUCHHAGEN, DL MINNA, JD MILLER, YE TI HUMAN AMINOACYLASE-1 - CLONING, SEQUENCE, AND EXPRESSION ANALYSIS OF A CHROMOSOME-3P21 GENE INACTIVATED IN SMALL-CELL LUNG-CANCER SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID ACYLPEPTIDE HYDROLASE; KIDNEY AMINOACYLASE; DNF15S2 LOCUS; PIG-KIDNEY; 3P21; HETEROZYGOSITY; PURIFICATION; SIMILARITY; DEFICIENCY; CARCINOMA AB Human aminoacylase-1 (N-acyl-L-amino-acid amidohydrolase, EC 3.5.1.14; ACY1) is a homodimeric zinc-binding enzyme that catalyzes the hydrolysis of N(alpha)-acylated amino acids. ACY1 has been assigned to chromosome 3p21.1, a region reduced to homozygosity in small cell lung cancer (SCLC), and has been reported to exhibit reduced or absent expression in SCLC cell lines and tumors. Two human cDNA libraries and one human genomic DNA library were screened with a previously isolated partial ACY1 cDNA to isolate a full-length transcript. Sequence analysis of clones from each of these libraries resulted in an ACY1 cDNA of 1438 base pairs with an open reading frame of 1224-base pairs coding for a putative protein of 408 amino acids with a predicted molecular mass of 45,882 Da. Sequence analysis revealed no homologies to previously reported cDNA or protein sequences and establishes ACY1 as the first member of a new family of zinc-binding enzymes to be so characterized. The subcellular location of ACY1 has been established as cytosolic by flow cytometry. Southern and northern analyses of ACY1 in SCLC cell lines failed to demonstrate any gross abnormalities of the ACY1 structural gene or instances of absent or aberrantly sized mRNA, respectively. C1 UNIV COLORADO,HLTH SCI CTR,DIV PULM SCI & CRIT CARE MED,DENVER,CO 80262. USN HOSP,NCI,NAVY MED ONCOL BRANCH,BETHESDA,MD 20889. UNIV TEXAS,SW MED CTR,SIMMONS COMPREHENS CANC CTR,DALLAS,TX 75235. UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. RP COOK, RM (reprint author), VET ADM MED CTR,111A,DENVER,CO 80220, USA. FU NCI NIH HHS [P50 CA58187]; NHLBI NIH HHS [HL-07085, R01 HL45745] NR 33 TC 41 Z9 42 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD AUG 15 PY 1993 VL 268 IS 23 BP 17010 EP 17017 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA LQ988 UT WOS:A1993LQ98800022 PM 8394326 ER PT J AU HAWLEY, M BARONAVSKI, AP NELSON, HH AF HAWLEY, M BARONAVSKI, AP NELSON, HH TI VIBRATIONAL DISTRIBUTIONS OF NH (A(1)DELTA) FROM THE PHOTOLYSIS OF HN3 FROM 220-290 NM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID INTERNAL ENERGY-DISTRIBUTION; 266 NM; PHOTODISSOCIATION DYNAMICS; HNCO PHOTODISSOCIATION; STATE DISTRIBUTIONS; 248 NM; DISSOCIATION; TRANSITION; 1-DELTA; EXCITATION AB We have measured the NH(a 1DELTA) vibrational distributions resulting from photolysis of HN3 at wavelengths ranging from 220 to 290 nm. The relative yields of v = 1 and v = 2 both show initial onsets far above the thermodynamic limit for their production and rise much faster than would be expected for a statistical distribution. The present results are compared to earlier results at 266 and 248 nm. Two possible explanations for our observations are proposed. RP HAWLEY, M (reprint author), USN,RES LAB,DIV CHEM,CODE 6111,WASHINGTON,DC 20375, USA. NR 26 TC 22 Z9 22 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 1993 VL 99 IS 4 BP 2638 EP 2642 DI 10.1063/1.465226 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LR056 UT WOS:A1993LR05600036 ER PT J AU KERSEY, AD BERKOFF, TA MOREY, WW AF KERSEY, AD BERKOFF, TA MOREY, WW TI MULTIPLEXED FIBER BRAGG GRATING STRAIN-SENSOR SYSTEM WITH A FIBER FABRY-PEROT WAVELENGTH FILTER SO OPTICS LETTERS LA English DT Article AB The use of a fiber Fabry-Perot filter for detecting the wavelength shift of a fiber Bragg grating sensor or network of sensor elements along a common fiber path is described. Results obtained by using a system with four sensor elements are presented. RP KERSEY, AD (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5674,WASHINGTON,DC 20375, USA. NR 9 TC 485 Z9 589 U1 7 U2 72 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 1993 VL 18 IS 16 BP 1370 EP 1372 DI 10.1364/OL.18.001370 PG 3 WC Optics SC Optics GA LQ850 UT WOS:A1993LQ85000029 PM 19823386 ER PT J AU CARROLL, TL PECORA, LM AF CARROLL, TL PECORA, LM TI CASCADING SYNCHRONIZED CHAOTIC SYSTEMS SO PHYSICA D LA English DT Article AB In recent work we have shown how one chaotic system may be synchronized with another by sending a signal from one to the other. In this paper, we demonstrate the cascading of synchronized chaotic systems. Such cascading allows the reproduction of all of the signals in the original chaotic system using only 1 signal. This configuration may be used as a ''chaos filter''. We also are able to vary a parameter in one chaotic system and, using only the chaotic signal, cause the corresponding parameter in another chaotic system to track these variations. This is a chaotic analog to a phase locked loop. RP CARROLL, TL (reprint author), USN,RES LAB,CODE 6341,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 12 TC 131 Z9 134 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG 15 PY 1993 VL 67 IS 1-3 BP 126 EP 140 DI 10.1016/0167-2789(93)90201-B PG 15 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA LT724 UT WOS:A1993LT72400007 ER PT J AU LINCHUNG, PJ YANG, MJ AF LINCHUNG, PJ YANG, MJ TI SUBBAND STRUCTURES OF STRAINED ALSB/INAS/ALSB QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-PROPERTIES; CYCLOTRON-RESONANCE; EFFECTIVE MASS; INAS; HETEROSTRUCTURES; TRANSISTORS; GAP AB A theoretical study of the electronic subband structure in a single quantum well of strained AlSb/InAs/AlSb has been carried out. A full four-band model has been used to incorporate the effects of strain, nonparabolicity, mass renormalization, and band bending. Subband energies and cyclotron masses of the InAs quantum wells for different well widths have been calculated explicitly. It is found that the biaxial tensile strain in the InAs well increases the subband energies and lowers the electron cyclotron mass as a result of the reduction of the direct gap and the splitting of the heavy-hole-light-hole bands. The mass renormalization and barrier effects, on the other hand, increase the cyclotron mass. Space charges in the well increase the ground subband energy, and the change is greater for wider wells. Better agreement with cyclotron resonance experiments is obtained when all of the above effects are included in the calculations of the cyclotron masses. RP LINCHUNG, PJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 19 Z9 19 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1993 VL 48 IS 8 BP 5338 EP 5344 DI 10.1103/PhysRevB.48.5338 PG 7 WC Physics, Condensed Matter SC Physics GA LV385 UT WOS:A1993LV38500044 ER PT J AU PARKS, C RAMDAS, AK MELLOCH, MR RAMMOHAN, LR AF PARKS, C RAMDAS, AK MELLOCH, MR RAMMOHAN, LR TI PIEZOMODULATED-REFLECTIVITY STUDY OF MINIBANDS IN ALXGA1-XAS/GAAS SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID SINGLE QUANTUM-WELLS; TRANSFER-MATRIX METHOD; SEMICONDUCTOR HETEROSTRUCTURES; GAAS/ALXGA1-XAS SUPERLATTICES; DISPERSION; SPECTRA; STATES; DEPENDENCE; EXCITONS AB We report the observation of miniband formation in superlattices of AlxGa1-xAs/GaAs, grown by molecular beam epitaxy, manifested in their piezomodulated-reflectivity spectra when studied as a function of well (l(w)) and barrier (l(b)) widths. The piezomodulated-reflectivity spectra reveal signatures of well separated optical transitions both at the Brillouin zone center and at the zone boundary extending to energies above the AlxGa1-xAs barrier. The clarity and sharpness of the spectral features allow an unambiguous identification of experimental transition energies with those calculated using the full eight-band k.p envelope-function approximation solved with the finite-element method. With l(w) = 25 angstrom [9 monolayers (ML)], l(b) = 20 angstrom (7 ML), and x = 0.34, the lowest energy transition at the miniband zone center and at the corresponding zone boundary are separated by 158 meV. With l(w) = 74 angstrom (26 ML) and l(b) = 45 angstrom (16 ML), the spectra correspond to quantum states in a multiple quantum well. Features associated with monolayer fluctuations in layer thickness are also observed. C1 PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907. WORCESTER POLYTECH INST,DEPT PHYS,WORCESTER,MA 01609. WORCESTER POLYTECH INST,DEPT ELECT & COMP ENGN,WORCESTER,MA 01609. USN,RES LAB,WASHINGTON,DC 20375. RP PARKS, C (reprint author), PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907, USA. RI Ram-Mohan, Ramdas/C-5167-2012 NR 39 TC 24 Z9 24 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 AUG 15 PY 1993 VL 48 IS 8 BP 5413 EP 5421 DI 10.1103/PhysRevB.48.5413 PG 9 WC Physics, Condensed Matter SC Physics GA LV385 UT WOS:A1993LV38500051 ER PT J AU REINECKE, TL YING, SC AF REINECKE, TL YING, SC TI SURFACE-MODES OF THE CLEAN RECONSTRUCTED W(100) SURFACE SO PHYSICAL REVIEW B LA English DT Note ID VIBRATIONAL PROPERTIES; SPECTROSCOPY; SCATTERING; DYNAMICS AB In previous work, we have developed force-constant models of the low-temperature clean reconstructed W(100) surface and have used them to study the vibrational properties of this surface. Here, we present a physical interpretation of the low-lying longitudinal- and transverse-surface modes of particular interest to experiment. This picture is based on the anticrossing of these modes and their zone folding upon reconstruction. These results provide insight into the interpretation of recent He atom scattering data and also into choices of force-constant models for this surface. C1 BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. RP REINECKE, TL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 1 Z9 1 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 AUG 15 PY 1993 VL 48 IS 8 BP 5679 EP 5681 DI 10.1103/PhysRevB.48.5679 PG 3 WC Physics, Condensed Matter SC Physics GA LV385 UT WOS:A1993LV38500084 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI ELECTRON-PHONON SCATTERING RATES IN QUANTUM WIRES SO PHYSICAL REVIEW B LA English DT Note ID LO PHONONS; SUPERLATTICES; WELLS; MODES AB Electron-phonon scattering rates for quantum wires composed of one compound semiconductor material within another are calculated rigorously for arbitrary wire shapes within the dielectric continuum approach for the optical phonons and the effective-mass approximation for the electrons. No approximations are used for the boundary conditions satisfied by the phonons or by the electrons. Detailed results are given for the intrasubband and intersubband scattering rates as functions of the initial electron energy and of wire size for wires of rectangular cross section. An interesting maximum in the intersubband scattering rate as a function of wire size is found. We find that interface phonons give important contributions to the scattering rates, especially for small (less than or similar to 100 angstrom) wire widths or high electron energies. We also give a quantitative appraisal of the rates obtained from simple separable approximations used previously for the phonons. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KNIPP, PA (reprint author), CHRISTOPHER NEWPORT UNIV,DEPT PHYS & COMP SCI,NEWPORT NEWS,VA 23606, USA. NR 17 TC 35 Z9 35 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 AUG 15 PY 1993 VL 48 IS 8 BP 5700 EP 5703 DI 10.1103/PhysRevB.48.5700 PG 4 WC Physics, Condensed Matter SC Physics GA LV385 UT WOS:A1993LV38500090 ER PT J AU SNOW, ES CAMPBELL, PM MCMARR, PJ AF SNOW, ES CAMPBELL, PM MCMARR, PJ TI FABRICATION OF SILICON NANOSTRUCTURES WITH A SCANNING TUNNELING MICROSCOPE SO APPLIED PHYSICS LETTERS LA English DT Article ID AIR AB A technique is presented for fabricating Si nanostructures with a scanning tunneling microscope operated in air. The process involves the direct chemical modification of a H-passivated Si(100) surface and a subsequent liquid etch. The chemically modified portions of the surface can withstand a deep ( > 100 nm) liquid etch of the unmodified regions with no etch degradation of the modified surface. At a write speed of 1 - 10 mum/s, large-area (50 mum X 50 mum) patterns with lateral feature sizes approximately 25 nm are reliably fabricated. RP USN, RES LAB, WASHINGTON, DC 20375 USA. RI Mote, Rakesh/A-9534-2009 NR 9 TC 172 Z9 173 U1 0 U2 14 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 AUG 9 PY 1993 VL 63 IS 6 BP 749 EP 751 DI 10.1063/1.109924 PG 3 WC Physics, Applied SC Physics GA LR258 UT WOS:A1993LR25800015 ER PT J AU GLESENER, JW AF GLESENER, JW TI PHOTOINDUCED CURRENT TRANSIENT SPECTROSCOPY OF BORON-DOPED DIAMOND SO APPLIED PHYSICS LETTERS LA English DT Article ID BULK; SYSTEM; TRAPS; FILMS AB A Schottky device fabricated on a natural type 2b diamond was characterized using photoinduced current transient spectroscopy (PICTS). A trapping level, presumed to be due to boron, with an activation energy of 0.29 eV was found from PICTS. Resistance measurements on the same device produced an activation energy of 0.38 eV. The two methods, while being described by the same exponential temperature dependence, have prefactors with different physical origins. Since the activation energy measured by PICTS is proportional to sigma(eff)e(-E/kT), the difference in the measured values could be attributed to a temperature dependence in the ''effective'' hole capture cross-section sigma(eff). This report also demonstrates the potential of PICTS in identifying an electrically active trap in a sample whose high series resistance renders it difficult to characterize using capacitance based methods. RP GLESENER, JW (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 18 TC 17 Z9 17 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 9 PY 1993 VL 63 IS 6 BP 767 EP 769 DI 10.1063/1.109902 PG 3 WC Physics, Applied SC Physics GA LR258 UT WOS:A1993LR25800021 ER PT J AU ALINAGHIAN, P GUMBSCH, P SKINNER, AJ PETTIFOR, DG AF ALINAGHIAN, P GUMBSCH, P SKINNER, AJ PETTIFOR, DG TI BOND ORDER POTENTIALS - A STUDY OF S-VALENT AND SP-VALENT SYSTEMS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID TRANSITION-METALS; SILICON; SURFACES; DEFECTS AB The relative structural stability of s- and sp-valent systems is examined within the fourth-moment approximation to the recently derived tight binding bond order potentials. At this low level of approximation we find that the application of a sum rule constraint to the choice of terminator is necessary to get good results. In particular, the competition between graphite, diamond and simple cubic sp-valent lattices is modelled well by the new angularly dependent bond order potentials. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. UNIV OXFORD,DEPT MAT,OXFORD OX1 3PH,ENGLAND. RP ALINAGHIAN, P (reprint author), UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT MATH,LONDON SW7 2BZ,ENGLAND. RI Gumbsch, Peter/E-5879-2012 OI Gumbsch, Peter/0000-0001-7995-228X NR 27 TC 24 Z9 25 U1 1 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 AUG 9 PY 1993 VL 5 IS 32 BP 5795 EP 5810 DI 10.1088/0953-8984/5/32/010 PG 16 WC Physics, Condensed Matter SC Physics GA LR829 UT WOS:A1993LR82900010 ER PT J AU OLSON, PE WALLACE, MR WEISS, PJ KENNEDY, CA AF OLSON, PE WALLACE, MR WEISS, PJ KENNEDY, CA TI PREVENTIVE CARE FOR HIV-POSITIVE ADULTS SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Letter RP OLSON, PE (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD AUG 4 PY 1993 VL 270 IS 5 BP 577 EP 577 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA LP436 UT WOS:A1993LP43600011 PM 8101233 ER PT J AU YIP, R SHARP, TW AF YIP, R SHARP, TW TI ACUTE MALNUTRITION AND HIGH CHILDHOOD MORTALITY RELATED TO DIARRHEA - LESSONS FROM THE 1991 KURDISH REFUGEE CRISIS SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Article AB Objective.-To determine the extent, major causes, and contributory factors of high rates of morbidity.and mortality among children at mountain camps along the Turkey-Iraq border during the 1991 Kurdish refugee crisis. Design.-A cross-sectional rapid nutrition survey among children and a retrospective mortality survey covering a 2-month period from the onset of the crisis. Population Studied.-Households of Kurdish refugees at resettlement camp 1 near Zakho in northern Iraq. Main Outcome Measures.-Prevalence of wasting (low weight-for-height) and mean weight-for-height status, prevalence of diarrhea, and crude and age-specific mortality rates. Results.-Weight-for-height measurements indicated that children under 2 years of age had suffered significant (P<.001) recent malnutrition. The elevated prevalence of wasting and the reduced mean weight-for-height status in this group indicated generalized weight loss. This weight loss was likely the result of the high rates of diarrhea, which still affected 50% of the younger children at the time of survey. The crude mortality rate for all ages was 8.9 per 1000 per month (expected rate, 0.6 per 1000); two thirds of the deaths occurred among children aged 5 years or younger, and half among infants younger than 1 year. An estimated 12% of all infants died during the first 2 months of the crisis. Most deaths were due to diarrhea, dehydration, and resulting malnutrition. Conclusions.-The high rates of malnutrition and mortality related to diarrhea in infants and younger children of Kurdish refugees took place rapidly despite prompt relief efforts and a previously healthy population. This experience underscores the need for early and aggressive public health management of sanitation, water sources, and diarrhea control programs to augment the traditional focus on food and medical relief during the emergency phase of a refugee crisis. C1 USN,MED RES INST,BETHESDA,MD 20814. RP YIP, R (reprint author), CTR DIS CONTROL & PREVENT,NATL CTR CHRON DIS PREVENT & HLTH PROMOT,DIV NUTR,4770 BUFORD HWY NE,ATLANTA,GA 30341, USA. NR 16 TC 53 Z9 54 U1 0 U2 2 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD AUG 4 PY 1993 VL 270 IS 5 BP 587 EP 590 DI 10.1001/jama.270.5.587 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA LP436 UT WOS:A1993LP43600022 PM 8331756 ER PT J AU JENSEN, KL ZAIDMAN, EG AF JENSEN, KL ZAIDMAN, EG TI FIELD-EMISSION FROM AN ELLIPTIC BOSS - EXACT VERSUS APPROXIMATE TREATMENTS SO APPLIED PHYSICS LETTERS LA English DT Article ID EMITTERS; SILICON AB Field emission from tips, in comparison to planar surfaces, is complicated by current enhancement effects and changes in the image charge. We show that the approximations typically used for the calculation of the transmission coefficient are inappropriate for small spherical surfaces but adequate for elliptical surfaces. A simple analytical formula for the average emitting area may be derived based on the Fowler-Nordheim equation under conditions of field emission. By use of the elliptical approximation, a simple scale factor is sufficient to deal with spherical and pointed tips. RP JENSEN, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Jensen, Kevin/I-1269-2015 OI Jensen, Kevin/0000-0001-8644-1680 NR 14 TC 10 Z9 10 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 AUG 2 PY 1993 VL 63 IS 5 BP 702 EP 704 DI 10.1063/1.109934 PG 3 WC Physics, Applied SC Physics GA LQ133 UT WOS:A1993LQ13300046 ER PT J AU TURNER, NH RAMAKER, DE HUTSON, FL AF TURNER, NH RAMAKER, DE HUTSON, FL TI ACCURATE DETERMINATION OF AUGER LINE-SHAPE BINDING-ENERGIES SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article ID NARROW-BAND METALS; ELECTRON SPECTROSCOPY; RESONANT EXCITATION; POLYETHYLENE; IDENTIFICATION; SPECTRA AB A quantitative comparison between an experimental and a theoretical description of any Auger spectrum requires a common energy reference point such as the Fermi level. With non-conductors this is problematic, because the Fermi level is not well defined and charging may shift the Fermi level. A common approach used to overcome this problem employs spectra containing the Auger peak, core, and valence band (VB) photoemission peaks. It is then necessary only to locate a common reference point in the Auger and VB spectra relative to the core level peak. We have developed a procedure in which a comparison is made between model theoretical and experimental spectra so that a large energy range (about 20 eV) of each spectrum can be utilized to locate the common reference points. We have found that this method enables accurate reference points to be determined even with severe sample charging. The method is precise enough to observe a differential charging effect in the polyethylene (PE) spectra. Although much smaller than that previously reported, a breakdown in the Cini-Sawatzky expression as modified for covalent systems still is suggested for PE. This breakdown can now be attributed to the limited one-dimensional delocalization required in long chain polymers. C1 GEORGE WASHINGTON UNIV,DEPT CHEM,WASHINGTON,DC 20052. RP TURNER, NH (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375, USA. NR 24 TC 2 Z9 2 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 AUG 2 PY 1993 VL 63 IS 2 BP 117 EP 130 DI 10.1016/0368-2048(93)80043-L PG 14 WC Spectroscopy SC Spectroscopy GA LR130 UT WOS:A1993LR13000002 ER PT J AU FIORITO, RB RULE, DW MARUYAMA, XK DINOVA, KL EVERTSON, SJ OSBORNE, MJ SNYDER, D RIETDYK, H PIESTRUP, MA HO, AH AF FIORITO, RB RULE, DW MARUYAMA, XK DINOVA, KL EVERTSON, SJ OSBORNE, MJ SNYDER, D RIETDYK, H PIESTRUP, MA HO, AH TI OBSERVATION OF HIGHER-ORDER PARAMETRIC X-RAY-SPECTRA IN MOSAIC GRAPHITE AND SINGLE SILICON-CRYSTALS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ORIENTED PYROLYTIC-GRAPHITE; ULTRARELATIVISTIC ELECTRONS; RELATIVISTIC-PARTICLES; CERENKOV EMISSION; RADIATION AB We have observed up to 8 orders (n) in the spectra of parametric x-radiation (PXR), in the range 5-40 keV, produced by the interaction of a 90 MeV electron beam with mosaic graphite and single silicon crystals. The measured yields and intensity ratios, I(n greater-than-or-equal-to 2)/I(n = 1), in graphite are not in agreement with the theory of PXR for mosaic crystals. In comparison, the ratios of intensities in silicon are close to the predictions of PXR theory for perfect crystals. The bandwidths of spectral lines measured in both silicon and graphite are in good agreement with theoretical predictions. C1 NAVAL POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. ADELPHI TECHNOL INC,PALO ALTO,CA 94301. RP FIORITO, RB (reprint author), USN,CTR SURFACE WARFARE,DEPT RES & TECHNOL,SILVER SPRING,MD 20903, USA. NR 23 TC 52 Z9 52 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 2 PY 1993 VL 71 IS 5 BP 704 EP 707 DI 10.1103/PhysRevLett.71.704 PG 4 WC Physics, Multidisciplinary SC Physics GA LQ107 UT WOS:A1993LQ10700012 ER PT J AU TUZZOLINO, AJ SIMPSON, JA MCKIBBEN, RB VOSS, HD GURSKY, H AF TUZZOLINO, AJ SIMPSON, JA MCKIBBEN, RB VOSS, HD GURSKY, H TI AN INSTRUMENT FOR DISCRIMINATION BETWEEN ORBITAL DEBRIS AND NATURAL PARTICLES IN NEAR-EARTH SPACE SO ADVANCES IN SPACE RESEARCH LA English DT Article ID VEGA SPACECRAFT; DUST; DETECTORS; COMET; MASS AB We discuss a SPAce DUSt instrument (SPADUS) under development for flight on the USA ARGOS mission to measure the flux, mass, velocity and trajectory of near-Earth dust. Since natural (cosmic) dust and man-made dust particles (orbital debris) have different velocity and trajectory distributions, they are distinguished by means of the SPADUS velocity/trajectory information. Measurements will cover the dust mass range approximately 5 x 10(-12) g (2 mum diameter) to approximately 1 x 10(-5) g (200 mum diameter), with an expected mean error in particle trajectory of approximately 7-degrees (isotropic flux). C1 LOCKHEED SPACE SCI LAB,PALO ALTO,CA 94304. USN,RES LAB,DIV SPACE SCI,WASHINGTON,DC 20375. RP TUZZOLINO, AJ (reprint author), UNIV CHICAGO,ASTROPHYS & SPACE RES LAB,CHICAGO,IL 60637, USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD AUG PY 1993 VL 13 IS 8 BP 133 EP 136 DI 10.1016/0273-1177(93)90580-5 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LQ666 UT WOS:A1993LQ66600018 ER PT J AU EGAN, JE HOFFMAN, SL HAYNES, JD SADOFF, JC SCHNEIDER, I GRAU, GE HOLLINGDALE, MR BALLOU, WR GORDON, DM AF EGAN, JE HOFFMAN, SL HAYNES, JD SADOFF, JC SCHNEIDER, I GRAU, GE HOLLINGDALE, MR BALLOU, WR GORDON, DM TI HUMORAL IMMUNE-RESPONSES IN VOLUNTEERS IMMUNIZED WITH IRRADIATED PLASMODIUM-FALCIPARUM SPOROZOITES SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID MALARIA VACCINE TRIALS; CD8+ T-CELLS; CIRCUMSPOROZOITE PROTEIN; SURFACE-ANTIGEN; ANTIBODIES; MICE; EFFICACY; GENE; PROTECTION; INHIBITION AB Volunteers immunized with gamma-irradiated Plasmodium falciparum sporozoites serve as the gold standard for protective immunity against mosquito-borne malaria transmission and provide a relevant model for studying protective immune effector mechanisms. During a 7-12-month period, we immunized four volunteers via the bites of irradiated, infected mosquitoes. Following these exposures to attentuated sporozoites, all four volunteers developed antibodies to sporozoites as measured by an immunofluorescence assay and by an enzyme-linked immunosorbent assay using the circumsporozoite (CS) protein repeat-based molecule R32LR as capture antigen. Three volunteers also developed antibodies against the nonrepeating (flanking) regions of the CS protein; the level of these antibodies paralleled the serum activity to inhibit sporozoite invasion of hepatoma cells in vitro. These three volunteers were protected against malaria transmitted by the bites of five infected mosquitoes. Two of these protected volunteers received additional immunizing doses of irradiated sporozoites and were subsequently protected against challenge with a heterologous P. falciparum clone. No detectable fluctuations were observed in circulating levels of tumor necrosis factor, interferon-gamma, or interleukin-6 during the course of this study. Analysis of the humoral and cellular immune responses of these protected volunteers is expected to yield important clues to additional targets of immunity against the pre-erythrocytic stages of malaria parasites. C1 WALTER REED ARMY INST RES,DEPT IMMUNOL,WASHINGTON,DC 20307. WALTER REED ARMY INST RES,DEPT ENTOMOL,WASHINGTON,DC 20307. USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20814. UNIV GENEVA,CMU,DEPT PATHOL,CH-1211 GENEVA 4,SWITZERLAND. BIOMED RES INST,ROCKVILLE,MD. RI Grau, Georges/D-7690-2014 OI Grau, Georges/0000-0002-0442-0462 NR 43 TC 99 Z9 99 U1 0 U2 2 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD AUG PY 1993 VL 49 IS 2 BP 166 EP 173 PG 8 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA LW871 UT WOS:A1993LW87100003 PM 8357078 ER PT J AU HEFFERNAN, JP MATTHEWS, RD SANDS, JP NOLAN, JF AF HEFFERNAN, JP MATTHEWS, RD SANDS, JP NOLAN, JF TI PERIOPERATIVE SERUM BUPIVACAINE LEVELS AFTER TOPICAL BLADDER ANESTHESIA FOR BLADDER BIOPSY SO ANESTHESIA AND ANALGESIA LA English DT Letter C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP HEFFERNAN, JP (reprint author), USN HOSP,DEPT UROL,SAN DIEGO,CA 92134, USA. NR 4 TC 3 Z9 3 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 AUG PY 1993 VL 77 IS 2 BP 402 EP 403 PG 2 WC Anesthesiology SC Anesthesiology GA LQ342 UT WOS:A1993LQ34200038 PM 8346851 ER PT J AU CAIN, JS AMEND, W AF CAIN, JS AMEND, W TI HERPETIC ESOPHAGITIS CAUSING INTRACTABLE HICCUPS SO ANNALS OF INTERNAL MEDICINE LA English DT Letter C1 UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. RP CAIN, JS (reprint author), USN HOSP,PORTSMOUTH,VA 23708, USA. NR 3 TC 3 Z9 3 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 AUG 1 PY 1993 VL 119 IS 3 BP 249 EP 249 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA LU903 UT WOS:A1993LU90300021 PM 8323098 ER PT J AU DRAKE, JC ALLEGRA, CJ JOHNSON, PG AF DRAKE, JC ALLEGRA, CJ JOHNSON, PG TI IMMUNOLOGICAL QUANTITATION OF THYMIDYLATE SYNTHASE FDUMP-5,10-METHYLENETETRAHYDROFOLATE TERNARY COMPLEX WITH THE MONOCLONAL-ANTIBODY TS-106 SO ANTI-CANCER DRUGS LA English DT Article DE 5-FLUOROURACIL; MONOCLONAL ANTIBODY; THYMIDYLATE SYNTHASE ID SYNTHETASE; 5-FLUORO-2'-DEOXYURIDYLATE; CANCER; 5-FLUOROURACIL AB Thymidylate synthase (TS) is responsible for the conversion of deoxyuridine monophosphate to deoxythymidine monophosphate. One of the principal mechanisms of action of 5-fluorouracil (5-FU) is the inhibition of TS by formation of a ternary covalent complex consisting of TS-5-fluorodeoxyuridylate-5,10-methylenetetrahydrofolate. We have developed a Western immunoblot assay using the monoclonal antibody TS 106 to measure ternary complex and free TS in intact human carcinoma cells following exposure to either 5-FU alone or 5-FU plus leucovorin. Lysates from cells treated with either 5-FU or 5-FU/leucovorin were resolved in 15% polyacrylamide gel, transferred onto nitrocellulose and immunoblotted using TS 106 antibody. Detection of positive bands was by a chromogenic substrate strain. Immunoblotting detected free TS at 36 kDa and TS in ternary complex at 38.5 kDa which were quantitated by densitometric scanning. This assay was able to detect a ternary complex from intact cells treated with 5-FU or 5FU/leucovorin up to 96 h after drug removal. The ratio of complex to free TS was up to 2-fold greater in 5-FU/leucovorin-treated cells compared to those treated with 5-FU alone. This assay may be applied to measuring the formation and stability of ternary complex and free TS in patient tissue samples. RP DRAKE, JC (reprint author), USN,HOSP MED,NCI,MED ONCOL BRANCH,BLDG 8,ROOM 5101,BETHESDA,MD 20889, USA. NR 14 TC 14 Z9 14 U1 0 U2 0 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0959-4973 J9 ANTI-CANCER DRUG JI Anti-Cancer Drugs PD AUG PY 1993 VL 4 IS 4 BP 431 EP 435 DI 10.1097/00001813-199308000-00002 PG 5 WC Oncology; Pharmacology & Pharmacy SC Oncology; Pharmacology & Pharmacy GA LU455 UT WOS:A1993LU45500002 PM 8400344 ER PT J AU ERVIN, AM EWING, KJ LAMONTAGNE, RA AGGARWAL, ID ROWLEY, DA AF ERVIN, AM EWING, KJ LAMONTAGNE, RA AGGARWAL, ID ROWLEY, DA TI DEVELOPMENT OF A FIBEROPTIC SENSOR FOR TRACE-METAL DETECTION IN AQUEOUS ENVIRONMENTS SO APPLIED OPTICS LA English DT Note DE COPPER; FIBEROPTIC ABSORPTION SPECTROSCOPY ID ALUMINUM(III) AB The availability and speciation of a number of metals widely dispersed in the aquatic environment intimately affect the biogeochemistry of the ocean and its inhabitants. Much research has been focused on the development of analytical methodologies to elucidate better the background concentrations, variability, and contaminant effects of metal species. The purpose of this research is to investigate the viability of a fiber-optic sensor that will be a sensitive and selective probe for trace metals in natural waters. C1 USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. RP ERVIN, AM (reprint author), GEORGE WASHINGTON UNIV, DEPT CHEM, WASHINGTON, DC 20052 USA. NR 9 TC 15 Z9 15 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 AUG 1 PY 1993 VL 32 IS 22 BP 4287 EP 4290 PG 4 WC Optics SC Optics GA LP433 UT WOS:A1993LP43300034 PM 20830085 ER PT J AU JAGANATHAN, J AGGARWAL, I AF JAGANATHAN, J AGGARWAL, I TI GRAPHITE-FURNACE ATOMIC-ABSORPTION SPECTROMETRIC DETERMINATION OF IRON, COBALT, NICKEL, AND COPPER AT PARTS-PER-BILLION LEVEL IN HIGH-PURITY LANTHANUM FLUORIDE SO APPLIED SPECTROSCOPY LA English DT Article DE ZBLAN GLASS; OPTICAL FIBERS; INTRINSIC LOSS ID CRYSTALLIZATION; GLASSES AB This paper describes an analytical method for the quantitation of iron, cobalt, nickel, and copper in lanthanum fluoride at trace levels with graphite furnace atomic absorption spectrometry (GFAAS) without using any matrix modifier. These metals were preconcentrated in HNO3 and analyzed directly. The detection limits for iron, cobalt, nickel, and copper were found to be 3, 1, 2, and 2 ppb, respectively. The average precision of measurements (% RSD) for all the elements was < 10%. C1 VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. RP JAGANATHAN, J (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5605,WASHINGTON,DC 20375, USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD AUG PY 1993 VL 47 IS 8 BP 1169 EP 1170 DI 10.1366/0003702934068062 PG 2 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA LU098 UT WOS:A1993LU09800013 ER PT J AU HARRIS, HC AF HARRIS, HC TI THE GLOBULAR-CLUSTER NGC-6366 - ITS BLUE STRAGGLERS AND VARIABLE-STARS SO ASTRONOMICAL JOURNAL LA English DT Article ID ECLIPSING BINARIES; CCD PHOTOMETRY; DWARF CEPHEIDS; NGC-5466; AGE; NGC-5053; SYSTEM AB The nearby, metal-rich, halo globular cluster NGC 6366 has been observed in order to obtain its color-magnitude diagram and to search for variable stars. The color-magnitude diagram indicates that the cluster has a reddening E(B-V) of 0.80 (higher than most previous determinations) and a distance of 3.0 kpc. The cluster has numerous blue straggler stars, and a list of 27 candidate blue stragglers is given. However, no blue stragglers are found to be variable, and the implications of this finding are discussed. The one RR Lyrae star in the cluster is studied, and its period and light curve are determined. The structural parameters of the cluster are determined. RP HARRIS, HC (reprint author), USN OBSERV,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 45 TC 29 Z9 29 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 AUG PY 1993 VL 106 IS 2 BP 604 EP 612 DI 10.1086/116664 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LN790 UT WOS:A1993LN79000014 ER PT J AU KOWALSKI, MP CRUDDACE, RG SNYDER, WA FRITZ, GG ULMER, MP FENIMORE, EE AF KOWALSKI, MP CRUDDACE, RG SNYDER, WA FRITZ, GG ULMER, MP FENIMORE, EE TI SPARTAN-1 X-RAY OBSERVATIONS OF THE PERSEUS CLUSTER .3. THE DISTRIBUTION OF IRON IN THE INTRACLUSTER GAS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ABUNDANCES; GALAXIES, CLUSTERING; INTERGALACTIC MEDIUM; X-RAYS, GALAXIES ID COMA CLUSTER; GALACTIC WINDS; GALAXIES; EINSTEIN; MATTER; ABUNDANCES; EVOLUTION; ELEMENTS; EXOSAT; CORE AB The Spartan 1 instrument has resolved the spatial and spectral distribution of the 1-10 keV X-ray emission from the Perseus cluster in a region extending 50' (1.6 Mpc) from the center. The data were fitted with a spherically symmetric three-dimensional model which included separate components for the cooling flow, the extended cluster emission, and a possible point source located at NGC 1275. A careful study has been made of the abundance distribution of iron as a function of radius. We confirm the existence of a gradient where the best-fit central abundance is 0.77(+0.30/-0.38) times the solar value and the linear gradient is -1.10(+0.89/-2.24) Mpc-1 (90% confidence for a single interesting parameter in both cases). Joint 90% confidence limits to the abundance parameters have been established, and the resulting limits to the abundance distribution have been applied to theoretical models of cluster structure and evolution. We find that our results are consistent with a gas-removal mechanism with enhanced efficiency at the cluster center such as ram-pressure stripping or thermal exaporation. Our results are also in agreement with cluster evolution models in which the initial density of primordial ps in the cluster formation region is high (greater-than-or-equal-to 10(28) g cm-3). The integrated mass of iron out to a radius of 1.6 Mpc is about 3 x 10(10) M., about 5 times smaller than that deduced from X-ray observations under the assumption of a constant abundance. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP KOWALSKI, MP (reprint author), USN,RES LAB,E O HULBURT CTR SPACE RES,CODE 7620,WASHINGTON,DC 20375, USA. NR 70 TC 23 Z9 23 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 1993 VL 412 IS 2 BP 489 EP 503 DI 10.1086/172937 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LN831 UT WOS:A1993LN83100004 ER PT J AU CLARK, JB AF CLARK, JB TI RISK ASSESSMENT AND CLINICAL AEROMEDICAL DECISION-MAKING SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID IN-FLIGHT INCAPACITATION; AVIATION AB This article presents a format of aeromedical decision-making used in neurology cases referred to a U.S. Navy Special Board of Flight Surgeons (SBFS) from 1988 to 1990. The format consists of a series of questions addressing aeromedical concerns, an aeromedical disposition flowchart, and a decision analysis tree. Decision Analysis is a tool used in clinical medicine to assist decision-making under conditions of uncertainty. The Decision Analysis approach may be applied to complex aeromedical disposition questions that face flight surgeons. The concept of risk assessment as it applies to decision-making and aeromedical disposition is discussed. The outcome of 24 neurology cases referred for aeromedical disposition are presented. C1 NAVAL AEROSP & OPERAT MED INST,DEPT NEUROL,NAS PENSACOLA,FL. RP CLARK, JB (reprint author), USN,DEPT AEROMED,MARINE AVIAT WEAP & TACT SQUADRON 1,S-5,BOX 99200,YUMA,AZ 85369, USA. OI Clark, Jonathan/0000-0002-1162-1238 NR 13 TC 5 Z9 6 U1 1 U2 1 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 AUG PY 1993 VL 64 IS 8 BP 741 EP 747 PG 7 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA LP566 UT WOS:A1993LP56600009 PM 8368988 ER PT J AU BECKER, JA ASCHER, DP MENDIOLA, J YODER, B WEISSE, M WAECKER, N HEROMAN, WM DAVIS, C FAJARDO, JE FISCHER, GW AF BECKER, JA ASCHER, DP MENDIOLA, J YODER, B WEISSE, M WAECKER, N HEROMAN, WM DAVIS, C FAJARDO, JE FISCHER, GW TI FALSE-NEGATIVE URINE LATEX PARTICLE AGGLUTINATION TESTING IN NEONATES WITH GROUP-B STREPTOCOCCAL BACTEREMIA - A FUNCTION OF IMPROPER TEST IMPLEMENTATION SO CLINICAL PEDIATRICS LA English DT Article ID RAPID DIAGNOSIS; BODY-FLUIDS; ANTIGEN; INFECTION; ASSAY AB Although blood cultures remain the most specific indicator of Group B streptococcus (GBS) sepsis, a potentially life-threatening infection in neonates, test results may not be available for 24 to 48 hours. Detection of GBS antigen in the urine by latex particle agglutination (LPA) may speed diagnosis. This study analyzed the sensitivity of the GBS urine LPA assay under clinical conditions. The urine of neonates with early-onset GBS bacteremia was analyzed for GBS antigen over a three-year period at six military medical centers. Overall, 53.5% (38/71) of infants with positive blood cultures had a positive urine LPA test. Only one medical center routinely followed manufacturer's recommendations to concentrate urine specimens before testing. These data suggest that the sensitivity for the urine LPA assay, when performed on unconcentrated urine, is lower than previously reported. Clinicians should insist that the laboratory maximize sensitivity by concentrating urine prior to GBS LPA testing. C1 WALTER REED ARMY MED CTR,DEPT PEDIAT,WASHINGTON,DC 20307. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. WILFORD HALL USAF MED CTR,LACKLAND AFB,TX 78236. TRIPLER ARMY MED CTR,OAHU,HI. USN HOSP,SAN DIEGO,CA 92134. USN HOSP,PORTSMOUTH,VA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU WESTMINSTER PUBL INC PI GLEN HEAD PA 708 GLEN COVE AVE, GLEN HEAD, NY 11545 SN 0009-9228 J9 CLIN PEDIATR JI Clin. Pediatr. PD AUG PY 1993 VL 32 IS 8 BP 467 EP 471 DI 10.1177/000992289303200805 PG 5 WC Pediatrics SC Pediatrics GA LT005 UT WOS:A1993LT00500005 PM 8403745 ER PT J AU SAGEMAN, WS AMUNDSON, DE AF SAGEMAN, WS AMUNDSON, DE TI THORACIC ELECTRICAL BIOIMPEDANCE MEASUREMENT OF CARDIAC-OUTPUT IN POSTAORTOCORONARY BYPASS PATIENTS SO CRITICAL CARE MEDICINE LA English DT Article DE AORTOCORONARY BYPASS; CARDIAC OUTPUT; CORONARY ARTERY BYPASS; INTENSIVE CARE UNIT; PULMONARY ARTERY CATHETER; THERMODILUTION; THORACIC SURGERY ID STROKE VOLUME; THERMODILUTION; IMPEDANCE AB Objective: To assess the degree of correlation and agreement between cardiac output by thermodilution and bioimpedance using the BoMed NCCOM3-R7 monitor in postaortocoronary bypass patients. Design: Prospective, randomized sampling. Setting. Military teaching hospital intensive care unit. Patients: Fifty patients undergoing coronary artery bypass surgery with thermodilution pulmonary artery catheters in place. Simultaneous determination of cardiac output by thermodilution and thoracic bioimpedance was performed. Readings were taken between 8 and 24 hrs after surgery. Forty patients were intubated; 19 patients had left-sided tube thoracotomy in addition to two mediastinal tubes, and 19 patients were obese. Interventions: None. Measurements and Main Results: The overall degree of correlation between the two measures was fair (r2 = .24). The bias and precision measurements were inaccurate as well (-0.33 +/- 3.14). Patients with normal body habitus or who were not receiving mechanical ventilation showed the best correlation (r2 = .40 and r2 = .45, respectively). Only 62% (31/50) of all patients had simultaneous measurements fall within 20% of each other, and there were no clinical features that made identification of those patients possible. Conclusions. Use of the BoMed NCCOM3-R7 bioimpedance monitor as a replacement for thermodilution-derived cardiac output cannot be recommended in postaortocoronary bypass patients. The distortions of patients' normal anatomy and physiology, coupled with the presence of endotracheal tubes and mechanical ventilation, mediastinal tubes and chest tubes, result in only fair correlation, significant bias, and poor precision between the two measures of cardiac output. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT CRIT CARE,SAN DIEGO,CA 92134. NR 13 TC 52 Z9 52 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0090-3493 J9 CRIT CARE MED JI Crit. Care Med. PD AUG PY 1993 VL 21 IS 8 BP 1139 EP 1142 DI 10.1097/00003246-199308000-00011 PG 4 WC Critical Care Medicine SC General & Internal Medicine GA LQ651 UT WOS:A1993LQ65100011 PM 8339577 ER PT J AU LANZANO, P AF LANZANO, P TI SOLITARY WAVES OF VORTICES WITHIN A ROTATING, FLUID SHELL SO EARTH MOON AND PLANETS LA English DT Article AB We consider a spherical, solid planet surrounded by a thin layer of an incompressible, inviscid fluid. The planet rotates with constant angular velocity about a fixed axis. The motion imparted by this planetary rotation upon the fluid particles of the ocean has been assumed to be governed by a linear version of the Navier-Stokes equation. We study the vortex motion within this rotating ocean and establish that the propagation of vortices depends on a third-order partial differential equation for the stream function. We prove that, in the most general case, this vorticity equation cannot generate any solitary waves; however, should the vertical component of vorticity satisfy a certain functional relationship, then we have obtained a family of solitary waves of permanent form. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 2 TC 1 Z9 1 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-9295 J9 EARTH MOON PLANETS JI Earth Moon Planets PD AUG PY 1993 VL 62 IS 2 BP 179 EP 189 DI 10.1007/BF00572146 PG 11 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA LZ297 UT WOS:A1993LZ29700008 ER PT J AU WU, C AF WU, C TI MAXIMUM COOLING LOAD OF A HEAT-ENGINE-DRIVEN REFRIGERATOR SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE MAXIMUM COOLING LOAD; REFRIGERATOR; ENDOREVERSIBLE AB An endoreversible heat-engine-driven refrigerator system to carry out the conversion of a high-temperature heat transfer into a cooling effect is modeled thermodynamically in this paper. The endoreversible system couples an external irreversible and internal reversible Carnot heat engine with a work-driven external irreversible and internal reversible Carnot refrigerator. The maximum cooling load of such a combined device is analyzed. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 21 Z9 23 U1 1 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 AUG PY 1993 VL 34 IS 8 BP 691 EP 696 DI 10.1016/0196-8904(93)90104-I PG 6 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA LH369 UT WOS:A1993LH36900011 ER PT J AU LAWMAN, MJP KIRBY, MR LAWMAN, PD KESSLER, S DONAHUE, RE AF LAWMAN, MJP KIRBY, MR LAWMAN, PD KESSLER, S DONAHUE, RE TI STEM-CELL PROLIFERATION FACTOR (SCPF) - A NOVEL CYTOKINE CAPABLE OF PROLIFERATING CD34+ CELLS IN LONG-TERM CULTURE SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 UNIV FLORIDA,COLL MED,GAINESVILLE,FL 32611. NHLBI,CLIN HEMATOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD AUG PY 1993 VL 21 IS 8 BP 1022 EP 1022 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA MW613 UT WOS:A1993MW61300048 ER PT J AU LEVINE, BL JUNE, CH KESSLER, SW SCHWARTZ, GN AF LEVINE, BL JUNE, CH KESSLER, SW SCHWARTZ, GN TI CALCIUM RESPONSES OF NORMAL HUMAN CD34(+)-DERIVED HEMATOPOIETIC-CELLS FOLLOWING STIMULATION BY ALUMINUM FLUORIDE F-MET-LEU-PHE, OR A COMBINATION OF CYTOKINES SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. RI Levine, Bruce/D-1688-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD AUG PY 1993 VL 21 IS 8 BP 1185 EP 1185 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA MW613 UT WOS:A1993MW61300644 ER PT J AU MCCARTHY, DD LUZUM, BJ AF MCCARTHY, DD LUZUM, BJ TI AN ANALYSIS OF TIDAL VARIATIONS IN THE LENGTH OF DAY SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Article DE EARTHS ROTATION; TIDES ID ATMOSPHERIC ANGULAR-MOMENTUM; EARTHS ROTATION; UNIVERSAL TIME; LOVE NUMBER; OCEAN TIDES; ZONAL TIDES; OF-DAY; FLUCTUATIONS; WAVES; UT1 AB Observations of the length of day, corrected for the effects of variations in the angular momentum due to changes in wind velocity and atmospheric pressure, ocean-tide heights and currents, and solid-Earth zonal tides, were analysed. The (1992) IERS Standards model for the effects of zonal tides on the Earth's rotation, which includes ocean-tidal effects, adequately accounts for the observations of the high-frequency (periods between one and 30 days) variations in the length of day at the present level of accuracy. A currently unexplained semi-annual variation in the length of day remains, but this may be due to the unmodelled effects of stratospheric winds. The power spectrum of the remaining variations with periods less than 20 days is essentially that of a white-noise process. The amplitudes of the remaining unexplained variations in length of day are less than 30 microseconds. RP MCCARTHY, DD (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 37 TC 7 Z9 7 U1 0 U2 1 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0956-540X J9 GEOPHYS J INT JI Geophys. J. Int. PD AUG PY 1993 VL 114 IS 2 BP 341 EP 346 DI 10.1111/j.1365-246X.1993.tb03922.x PG 6 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA LR353 UT WOS:A1993LR35300011 ER PT J AU SURETTE, MR GOLDBERG, L MEHUYS, D AF SURETTE, MR GOLDBERG, L MEHUYS, D TI HIGH-POWER RING LASER USING A BROAD-AREA GAALAS AMPLIFIER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID SEMICONDUCTOR AMPLIFIER; CAVITY; ARRAY AB A high-power external-cavity ring laser, incorporating a 600-mum-wide GaAlAs traveling wave amplifier as a gain element, is demonstrated. The laser generated a pulsed (200 ns) output power of 9.3 W with a near-diffraction limited beam quality and unidirectional ring propagation. The power versus output coupling dependence agreed with independently measured gain saturation characteristics of the amplifier. C1 SPECTRA DIODE LAB,SAN JOSE,CA 95134. RP SURETTE, MR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD AUG PY 1993 VL 5 IS 8 BP 919 EP 922 DI 10.1109/68.238254 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MC694 UT WOS:A1993MC69400020 ER PT J AU HALL, DC GOLDBERG, L MEHUYS, D AF HALL, DC GOLDBERG, L MEHUYS, D TI INTERFEROMETRIC MEASUREMENT OF LATERAL PHASE PROFILE AND THERMAL LENSING IN BROAD-AREA DIODE AMPLIFIERS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID SEMICONDUCTOR AMPLIFIER; REFRACTIVE-INDEX; ARRAYS AB A Mach-Zehnder imaging interferometer is used to directly measure the lateral optical phase profile in the near field of broad-area semiconductor optical amplifiers with lambda / 25 phase resolution, or 0.1-degrees-C in temperature. The quadratic thermally induced phase distortion and its equivalent thermal lens focal length is characterized. Anomalous localized phase variations are correlated to thermal bond nonuniformities in devices mounted under nonoptimal conditions. It is also demonstrated in an unbiased 600-mum-wide by 1000-mum-long amplifier device that a phase uniformity across the stripe of better than lambda / 25 can be obtained. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP HALL, DC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD AUG PY 1993 VL 5 IS 8 BP 922 EP 925 DI 10.1109/68.238255 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MC694 UT WOS:A1993MC69400021 ER PT J AU FABINY, L VOHRA, ST BUCHOLTZ, F AF FABINY, L VOHRA, ST BUCHOLTZ, F TI HIGH-RESOLUTION FIBEROPTIC LOW-FREQUENCY VOLTAGE SENSOR-BASED ON THE ELECTROSTRICTIVE EFFECT SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID ELECTRIC-FIELD SENSOR; RELAXOR FERROELECTRICS AB We demonstrate a minimum detectable voltage of 40 nV/square-root Hz at 1 Hz in a fiber-optic interferometric low-frequency voltage sensor. The device maintains good resolution below 1 Hz, providing a minimum detectable voltage of 55 nV/square-root Hz at 0.1 Hz and 129 nV/square-root Hz at 0.03 Hz. High resolution at low frequencies is attainable due to the nonlinear strain response of the electrostrictive transducer to an applied electric field which upconverts low-frequency voltage signals as sidebands of a high-frequency carrier where 1/f noise is not dominant. The measured low-frequency data represents an improvement of > 45 dB over previously reported results. RP FABINY, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 6 Z9 8 U1 1 U2 3 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 AUG PY 1993 VL 5 IS 8 BP 952 EP 953 DI 10.1109/68.238266 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MC694 UT WOS:A1993MC69400032 ER PT J AU ALOUANI, AT XIA, P RICE, TR BLAIR, WD AF ALOUANI, AT XIA, P RICE, TR BLAIR, WD TI ON THE OPTIMALITY OF 2-STAGE STATE ESTIMATION IN THE PRESENCE OF RANDOM BIAS SO IEEE TRANSACTIONS ON AUTOMATIC CONTROL LA English DT Note AB This note provides sufficient conditions for the optimality of a two-stage estimator for state estimation in the presence of random bias. Under an algebraic constraint on the correlation between the state and bias process noises, the optimal estimate of the system state can be obtained as a linear combination of the output of the first stage (a ''bias-free'' filter) and the second stage (a bias filter). Because the algebraic constraint is restrictive in practice, the results of this note indirectly indicate that for most practical systems the proposed solution to the two-stage estimation problem will be suboptimal. C1 USN,CTR SURFACE WARFARE,DEPT SYST RES & TECHNOL,DIV DAHLGREN,DAHLGREN,VA 22448. RP ALOUANI, AT (reprint author), TENNESSEE TECHNOL UNIV,DEPT ELECT ENGN,COOKEVILLE,TN 38505, USA. NR 8 TC 41 Z9 44 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 0018-9286 J9 IEEE T AUTOMAT CONTR JI IEEE Trans. Autom. Control PD AUG PY 1993 VL 38 IS 8 BP 1279 EP 1282 DI 10.1109/9.233168 PG 4 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA LW670 UT WOS:A1993LW67000018 ER PT J AU ALLEN, OE HILL, DA ONDREJKA, AR AF ALLEN, OE HILL, DA ONDREJKA, AR TI TIME-DOMAIN ANTENNA CHARACTERIZATIONS SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Article AB A set of time-domain characterizations that can efficiently describe wide band antennas is proposed in this paper. The experimentally measured responses of transverse electromagnetic horn antennas are used to evaluate the utility of these characterizations. Comparisons are made between the antennas' frequency-domain response and their time-domain characterizations. The comparisons show that the time-domain characterizations can provide significant insight into an antenna's behavior as well as providing a means to accurately compare two or more different antennas. C1 USN,CTR AIR WARFARE,DIV AIRCRAFT,ELECTROMAGNET COMPATIBIL SECT,PATUXENT RIVER,MD 20670. NIST,DIV ELECTROMAGNET FIELDS,BOULDER,CO 80303. UNIV COLORADO,DEPT ELECT & COMP ENGN,BOULDER,CO 80309. NR 9 TC 59 Z9 65 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 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD AUG PY 1993 VL 35 IS 3 BP 339 EP 346 DI 10.1109/15.277308 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA MA764 UT WOS:A1993MA76400003 ER PT J AU SCHMIDT, WAC DAVIS, JP AF SCHMIDT, WAC DAVIS, JP TI PATTERN-RECOGNITION PROPERTIES OF VARIOUS FEATURE SPACES FOR HIGHER-ORDER NEURAL NETWORKS SO IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE LA English DT Article DE FEATURE SPACE; GEOMETRIC INVARIANCE; HIGHER ORDER NEURAL NETWORKS; PATTERN RECOGNITION; TARGET DETECTION; TEMPLATE MATCHING; TEMPLATES AB Higher order neural networks (HONN's) are a form of preprocessing for the standard backpropagation neural networks that use geometrically motivated nonlinear combinations of scene pixels to achieve invariant pattern recognition feature spaces. In standard backpropagation, scene pixel values are presented directly to the neural network input nodes. By proper choice of HONN pixel combinations, it is possible to directly incorporate geometric invariance properties into the HONN. The HONN can be considered to be a particular type of preprocessing that explicitly creates nonlinear decision surfaces. Originally, HONN's had fully interconnected input pixels that caused a severe storage requirement. We explore alternatives that reduce the number of network weights while maintaining geometric invariant properties for recognizing patterns in real-time processing applications. This study is limited to translation and rotation invariance. We are primarily interested in examining the properties of various feature spaces for HONN's, in correlated and uncorrelated noise, such as the effect of various types of input features, feature size and number of feature pixels, and effect of scene size. We also consider the HONN training robustness in terms of target detectability. The experimental setup consists of a 15 x 20 pixel scene possibly containing a 3 x 10 target. Each trial used 500 training scenes plus 500 testing scenes. Results indicate that HONN's yield similar geometric invariant target recognition properties to classical template matching. However, the HONN's require an order of magnitude less computer processing time compared with template matching. For our simple target, HONN's with zero hidden layers yield results equivalent to HONN's with multiple layers. This reduces network training time over the multiple layer networks. Finally HONN's exhibit robust training characteristics. The HONN's that were trained at one input noise level and tested at a different level maintained similar probability of detection and probability of false alarm characteristics than did the HONN's that were trained and tested at the same input noise levels. Results indicate that HONN's could be considered for real-time target recognition applications. RP SCHMIDT, WAC (reprint author), USN,CTR AIR DEV,DEPT MISS & AVION TECHNOL,WARMINSTER,PA 18974, USA. NR 8 TC 21 Z9 21 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 0162-8828 J9 IEEE T PATTERN ANAL JI IEEE Trans. Pattern Anal. Mach. Intell. PD AUG PY 1993 VL 15 IS 8 BP 795 EP 801 DI 10.1109/34.236250 PG 7 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LR948 UT WOS:A1993LR94800004 ER PT J AU GOLD, SH SULLIVAN, CA HAFIZI, B MANHEIMER, WM AF GOLD, SH SULLIVAN, CA HAFIZI, B MANHEIMER, WM TI STUDY OF GAIN IN C-BAND DEFLECTION CAVITIES FOR A FREQUENCY-DOUBLING MAGNICON AMPLIFIER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB We report an experimental study of the gain between two half-wavelength, 5.7 GHz TM110 pillbox cavities, separated by a quarter-wavelength drift space, and powered by a 170A, 500 keV electron beam immersed in an 8.1 kG magnetic field. These cavities constitute the first section of a planned multicavity deflection system, whose purpose is to spin up an electron beam to high transverse momentum (alpha = upsilon(perpendicular-to)/upsilon(z) greater than or similar to 1) for injection into the output cavity of a frequency-doubling magnicon amplifier. We have observed a gain of approximately 15 dB in the preferred circular polarization, at a frequency shift of approximately -0.18%, in the opposite circular polarization, at a frequency shift of approximately +0.06%. These results are in good agreement with theory. C1 ICARUS RES,BETHESDA,MD 20814. USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP GOLD, SH (reprint author), USN,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 8 TC 9 Z9 9 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD AUG PY 1993 VL 21 IS 4 BP 383 EP 387 DI 10.1109/27.234565 PG 5 WC Physics, Fluids & Plasmas SC Physics GA LY545 UT WOS:A1993LY54500006 ER PT J AU NAKAMURA, Y MUKHERJEE, R AF NAKAMURA, Y MUKHERJEE, R TI EXPLOITING NONHOLONOMIC REDUNDANCY OF FREE-FLYING SPACE ROBOTS SO IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION LA English DT Note ID MANIPULATORS AB Nonholonomic redundancy is an intrinsic property of nonholonomic mechanical systems. A free-flying space robot is a nonholonomic mechanical system, and exhibits the presence of nonholonomic redundancy even in the absence of ordinary kinematic redundancy. Like ordinary kinematic redundancy, nonholonomic redundancy can also be utilized while planning trajectories for the system. In the paper, a trajectory planning scheme for a 6-DOF space robot is developed in which nonholonomic redundancy for avoiding joint limits and obstacles are utilized. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP NAKAMURA, Y (reprint author), UNIV TOKYO,DEPT MECH INFORMAT,7-3-1 HONGO,BUNKYO KU,TOKYO 113,JAPAN. RI Mukherjee, Ranjan/A-7518-2009 NR 12 TC 39 Z9 52 U1 0 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1042-296X J9 IEEE T ROBOTIC AUTOM JI IEEE Trans. Robot. Autom. PD AUG PY 1993 VL 9 IS 4 BP 499 EP 506 DI 10.1109/70.246062 PG 8 WC Automation & Control Systems; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Engineering; Robotics GA MK082 UT WOS:A1993MK08200015 ER PT J AU LUCKE, RL STOCKER, AD AF LUCKE, RL STOCKER, AD TI FILTERING INTERPOLATORS FOR FRAME DIFFERENCING SIGNAL PROCESSORS SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Article AB Interpolation error contributes to clutter leakage through a frame differencing signal processor, especially for highly structured scenes. For low sampling rates, interpolation error can be reduced by as much as an order of magnitude by applying a spectral filter to the unshifted frame that matches the filtering effect of applying the interpolator to the frame that is shifted. The signature reduction penalty for point targets is rarely as large as a factor of two, leading to substantial improvements in signal-to-clutter ratios when interpolation error is the dominant source of clutter. Parameterized families of local interpolators (polynomial and trigonometric) that can be adjusted to the particular target/clutter/noise combination of interest are presented. C1 SPACE COMP CORP,SANTA MONICA,CA 90404. RP LUCKE, RL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 2 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 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD AUG PY 1993 VL 41 IS 8 BP 2574 EP 2582 DI 10.1109/78.229889 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA LR595 UT WOS:A1993LR59500004 ER PT J AU RAY, BK AF RAY, BK TI LONG-RANGE FORECASTING OF IBM PRODUCT REVENUES USING A SEASONAL FRACTIONALLY DIFFERENCED ARMA MODEL SO INTERNATIONAL JOURNAL OF FORECASTING LA English DT Article DE FRACTIONAL DIFFERENCING; SEASONALITY; ARIMA MODELS; LONG-RANGE PREDICTION ID TIME-SERIES AB We use a series of monthly IBM product revenues to illustrate the usefulness of seasonal fractionally differenced ARMA models for business forecasting. By allowing two seasonal fractional differencing parameters in the model, one at lag three and the other at lag twelve, we obtain a stationary series without losing information about the process behavior through over-differencing. We apply modified identification and estimation techniques to th IBM revenue data and compare the resulting model with a specific non-fractional seasonal ARIMA model by looking at each model's forecasts. The fractionally differenced seasonal model gives more accurate next-quarter, next-half-year, next-year, and next-two-years forecasts than the non-fractional seasonal model based on criteria that are specifically constructed to reflect the accuracy of long-range periodic forecasts. C1 USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943. NR 23 TC 49 Z9 49 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-2070 J9 INT J FORECASTING JI Int. J. Forecast. PD AUG PY 1993 VL 9 IS 2 BP 255 EP 269 DI 10.1016/0169-2070(93)90009-C PG 15 WC Economics; Management SC Business & Economics GA LW961 UT WOS:A1993LW96100009 ER PT J AU MAGNUS, RH AF MAGNUS, RH TI NAVAL STRATEGY EAST OF SUEZ - THE ROLE OF DJIBOUTI - KOBURGER,CW SO INTERNATIONAL JOURNAL OF MIDDLE EAST STUDIES LA English DT Book Review RP MAGNUS, RH (reprint author), USN,SCH POSTGRAD,DEPT NAT SECUR AFFAIRS,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0020-7438 J9 INT J MIDDLE E STUD JI Int. J. Middle East Stud. PD AUG PY 1993 VL 25 IS 3 BP 532 EP 533 PG 2 WC Area Studies SC Area Studies GA LM509 UT WOS:A1993LM50900028 ER PT J AU SHAW, GJ WALTERS, RJ MESSENGER, SR SUMMERS, GP AF SHAW, GJ WALTERS, RJ MESSENGER, SR SUMMERS, GP TI TIME-DEPENDENCE OF RADIATION-INDUCED GENERATION CURRENTS IN IRRADIATED INGAAS PHOTODIODES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LOW DARK-CURRENT; I-N PHOTODIODE; CAP LAYER; INP AB The annealing behavior of the reverse bias current-voltage curves of 1 MeV electron irradiated In0.53Ga0.47As photodiodes has been measured at 300 K. The observed decay is shown to be correlated with the reduction of the E2 peak height with time, as measured by deep level transient spectroscopy. The reverse current is found to decay with a logarithmic time dependence, which can be explained by a model in which the annealing of the E2 defects is controlled by a distribution of thermal energy barriers. C1 UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. USN,RES LAB,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD 20785. NR 22 TC 10 Z9 11 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 AUG 1 PY 1993 VL 74 IS 3 BP 1629 EP 1635 DI 10.1063/1.354812 PG 7 WC Physics, Applied SC Physics GA LQ127 UT WOS:A1993LQ12700023 ER PT J AU MOORE, WJ AF MOORE, WJ TI IDENTIFICATION AND ACTIVATION-ENERGIES OF SHALLOW DONORS IN CUBIC SIC SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TEMPERATURE-DEPENDENCE; ELECTRICAL-PROPERTIES; BAND; SILICON; FILMS AB Silicon carbide grown by the chemical vapor deposition process on silicon often contains high concentrations of nitrogen donors with a binding energy of 54 meV as determined from photoluminescence studies. In contrast, the conductivity in the same samples is dominated by a heavily compensated shallow donor with a binding energy below 20 meV. The conventional view is that these two donors are the same. The 54 meV donors usually are assumed to be isolated substitutional nitrogen in regions of low concentration while the < 20 meV donors are believed to be nitrogen in regions of high concentration. The most convincing evidence for this identification is the continuum of binding energies from 50 to 15 meV for SiC as a function of donor concentration compiled from published results. Evidence for reassessing the conventional view is given in this article and several experiments supporting the conventional view are reconsidered. As a result of this reconsideration, we propose that the donors below 20 meV which dominate the conductivity are not neutral, substitutional nitrogen in high concentration but some other center. D- centers and donor complexes are possible origins of this donor. The D- center appears to have many of the characteristics required for satisfactory modeling of this material. RP MOORE, WJ (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 22 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1993 VL 74 IS 3 BP 1805 EP 1809 DI 10.1063/1.354785 PG 5 WC Physics, Applied SC Physics GA LQ127 UT WOS:A1993LQ12700051 ER PT J AU OLSEN, EA AF OLSEN, EA TI FROM PUSAN TO PANMUNJOM - YUP,PS SO JOURNAL OF ASIAN STUDIES LA English DT Book Review RP OLSEN, EA (reprint author), USN,GRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ASSN ASIAN STUDIES INC PI ANN ARBOR PA UNIV MICH 1 LANE HALL, ANN ARBOR, MI 48109 SN 0021-9118 J9 J ASIAN STUD JI J. Asian Stud. PD AUG PY 1993 VL 52 IS 3 BP 738 EP 740 DI 10.2307/2058896 PG 3 WC Area Studies; Asian Studies SC Area Studies; Asian Studies GA LW473 UT WOS:A1993LW47300046 ER PT J AU WHITSON, SW FALK, MC RELLER, E WHITSON, MA AF WHITSON, SW FALK, MC RELLER, E WHITSON, MA TI THE ANTIOXIDANT EFFECTS OF 2-OXO-THIAZOLIDINE-4-CARBOXYLATE (OTC) ON BONE-FORMATION IN-VITRO SO JOURNAL OF BONE AND MINERAL RESEARCH LA English DT Meeting Abstract C1 SO ILLINOIS UNIV,SCH DENT MED,ALTON,IL. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0884-0431 J9 J BONE MINER RES JI J. Bone Miner. Res. PD AUG PY 1993 VL 8 SU 1 BP S312 EP S312 PG 1 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA LR205 UT WOS:A1993LR20500781 ER PT J AU HE, JK TAM, AW YARBOUGH, PO REYES, GR CARL, M AF HE, JK TAM, AW YARBOUGH, PO REYES, GR CARL, M TI EXPRESSION AND DIAGNOSTIC UTILITY OF HEPATITIS-E VIRUS PUTATIVE STRUCTURAL PROTEINS EXPRESSED IN INSECT CELLS SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID NON-B HEPATITIS; TRANSMITTED NON-A; LINKED-IMMUNOSORBENT-ASSAY; DEPENDENT RNA-POLYMERASE; EPIDEMIC NON-A; IDENTIFICATION; EPITOPES; ANTIBODIES; CHILDREN; STRAIN AB The full-length putative structural proteins encoded by open reading frame 2 (ORF2) and ORF3 of hepatitis E virus have been cloned and expressed in recombinant baculovirus. Sera obtained from 28 Sudanese pediatric patients with acute hepatitis and 19 pediatric control patients were analyzed for reactivity to hepatitis E virus by using the baculovirus-expressed ORF2 and ORF3 proteins in a Western blot (immunoblot) format. Seventeen of the 18 patients classified as having non-A, non-B hepatitis, without acute antibody markers for hepatitis A, B, or C viruses, Epstein-Barr virus, or cytomegalovirus, were shown to have immunoglobulin M (IgM) antibodies to the recombinant ORF2 protein, as did two patients with chronic hepatitis B, three of seven patients with acute hepatitis A, and one patient with acute hepatitis B. None of the 19 control patients had IgM antibodies against the ORF2 or ORF3 proteins. The Western blot assay using the baculovirus-expressed ORF3 protein did not appear to be as sensitive as the assay based on the ORF2 protein. Only 10 of the patients classified as having non-A, non-B hepatitis had IgM antibodies to the baculovirus-expressed ORF3 protein. We conclude that a Western blot assay which uses a baculovirus-expressed ORF2 protein is both sensitive and specific for diagnosing acute hepatitis E. C1 USN,MED RES INST,ACCELERATED PROD DEV PROGRAM,BETHESDA,MD 20889. GENELABS INC,DEPT MOLEC VIROL,REDWOOD CITY,CA 94063. NR 33 TC 60 Z9 63 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD AUG PY 1993 VL 31 IS 8 BP 2167 EP 2173 PG 7 WC Microbiology SC Microbiology GA LM795 UT WOS:A1993LM79500038 PM 8370746 ER PT J AU KORENSTEIN, R HALLOCK, PH LEE, DL SULLIVAN, E GEDRIDGE, RW HIGA, KT AF KORENSTEIN, R HALLOCK, PH LEE, DL SULLIVAN, E GEDRIDGE, RW HIGA, KT TI INDIUM DOPING OF HGCDTE GROWN BY METALORGANIC CHEMICAL-VAPOR DEPOSITION-DIRECT ALLOY GROWTH USING TRIISOPROPYLINDIUM AND DIISOPROPYLTELLURIUM.TRIISOPROPYLINDIUM ADDUCT SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE DIPTE; HGCDTE; MOCVD-DAG; TIPIN ID PHASE EPITAXY; GAAS AB A new indium source, triisopropylindium, was used to dope HgCdTe layers grown by metalorganic chemical vapor deposition n-type with carrier concentrations, n(H), in the range between low 10(15) and low 10(17) cm-3 at 77K. The reproducibility of carrier concentration was found to be excellent for n(H) < 3 x 10(15) Cm-3. High electron mobilities and minority carrier lifetime comparable to published values indicate that indium doping produces high quality n-type HgCdTe material. State-ofthe-art photodiodes were obtained by growing a p-type HgCdTe layer by liquid phase epitaxy on an indium doped layer. In addition, an adduct compound formed between diisopropyltellurium (DIPTe) and triisopropylindium (TIPIn): DIPTe.InTIP, was also found to be a viable n-type dopant for HgCdTe especially at concentrations in the low 10(15) cm-3 or less. C1 USN,CTR AIR WARFARE,RES DEPT,DIV WEAPONS,CHINA LAKE,CA 93555. RP KORENSTEIN, R (reprint author), RAYTHEON CO,DIV RES,LEXINGTON,MA 02173, USA. NR 13 TC 12 Z9 12 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 AUG PY 1993 VL 22 IS 8 BP 853 EP 857 DI 10.1007/BF02817497 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA LR505 UT WOS:A1993LR50500010 ER PT J AU IRVINE, SJC BAJAJ, J BUBULAC, LO LIN, WP GEDRIDGE, RW HIGA, KT AF IRVINE, SJC BAJAJ, J BUBULAC, LO LIN, WP GEDRIDGE, RW HIGA, KT TI A NEW N-TYPE DOPING PRECURSOR FOR MOCVD-IMP GROWTH OF DETECTOR QUALITY MCT SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE DETECTOR QUALITY; HGCDTE; LPE; MOCVD-IMP GROWTH; N-TYPE DOPING ID ELECTRICAL-PROPERTIES; HGCDTE; MOVPE AB A new indium precursor, triisopropyl indium (TIPIn), has been used for doping MCT at low carrier concentrations. Previous attempts using indium organometallics resulted in a strong memory effect where residual doping would persist for many growth runs. Introducing TIPIn on the tellurium inject line resulted in a similarly strong memory doping but this was not observed when feeding the dopant in on the cadmium injection line. The TIPIn is believed to have been forming a low volatility adduct with diisopropyl tellurium (DIPTe) in the feed line and to have continued to evaporate at a low but significant rate. By keeping the TIPIn and DIPTe precursors separate until they entered the reactor, the desired low 10(15) cm-3 carrier concentration and flat indium profiles could be achieved with good reproducibility. Good electrical characteristics were measured for these layers with Auger limited lifetime >1 mus at 77K. C1 USN,CTR AIR WARFARE,DIV WEAPONS,CHINA LAKE,CA 93555. RP IRVINE, SJC (reprint author), ROCKWELL INT CORP,CTR SCI,1049 CAMINO DOS RIOS,THOUSAND OAKS,CA 91360, USA. NR 13 TC 12 Z9 12 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 AUG PY 1993 VL 22 IS 8 BP 859 EP 864 DI 10.1007/BF02817498 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA LR505 UT WOS:A1993LR50500011 ER PT J AU EDDY, CR HOFFMAN, CA MEYER, JR DOBISZ, EA AF EDDY, CR HOFFMAN, CA MEYER, JR DOBISZ, EA TI NANOMETER FABRICATION IN MERCURY CADMIUM TELLURIDE BY ELECTRON-CYCLOTRON-RESONANCE MICROWAVE PLASMA REACTIVE ION ETCHING SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE E-BEAM LITHOGRAPHY; HGCDTE; PLASMA REACTIVE ION ETCHING ID QUANTUM-WELLS; TRANSPORT; HYDROGEN; METHANE; GAS; HG1-XCDXTE AB It has been recently reported (J.R. Meyer, F.J. Bartoli, C.A. Hoffman, and L.R. Ram-Mohan, Phys. Rev. Lett. 64, 1963 [1990]) that novel electronic and optical effects are anticipated in nanometer scale features of narrow band gap semiconductors such as mercury cadmium telluride (MCT). These efforts could lead to the creation of non-linear optical switches, high efficiency infrared lasers, and unique nanoelectronic devices. This work reports on the first realization of MCT nanostructures through the application of e-beam lithography and reactive ion etching with an electron cyclotron resonance (ECR) microwave plasma source. It is shown that the low energy ions produced by an ECR system can etch MCT with good selectivity over an e-beam resist mask and with high resolution. Using these fabrication methods, 40-70 nm features with aspect ratios of 3-5:1 and sidewall angles greater than 88-degrees have been demonstrated. Qualitative investigations of some of the etch mechanisms of this technique are made, and results suggest a desorption limited process. RP EDDY, CR (reprint author), USN,RES LAB,CODE 6675,WASHINGTON,DC 20375, USA. NR 26 TC 10 Z9 10 U1 0 U2 1 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 AUG PY 1993 VL 22 IS 8 BP 1055 EP 1060 DI 10.1007/BF02817524 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA LR505 UT WOS:A1993LR50500037 ER PT J AU LUO, H RAMMOHAN, LR YANG, GL XUAN, Y FURDYNA, JK AF LUO, H RAMMOHAN, LR YANG, GL XUAN, Y FURDYNA, JK TI STATES CONFINED IN THE BARRIERS OF TYPE-III HGTE/CDTE SUPERLATTICES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE EXCITON FORMATION; HGTE/CDTE SUPERLATTICE; QUASI-LOCALIZED STATES IN CDTE BARRIERS ID QUANTUM WELLS; EXCITONS; ENERGY AB We present a theoretical study of states quasi-localized in CdTe barriers of HgTe/CdTe superlattices. We show that the quasi-localization of both electrons and holes will lead to strong Coulomb interaction, and thus to the formation of excitons. It is further demonstrated that such quasi-localized states, including excitons, exhibit confinement effect similar to those of localized states in quantum wells. C1 WORCESTER POLYTECH INST,DEPT PHYS,WORCESTER,MA 01609. WORCESTER POLYTECH INST,DEPT ELECT & COMP ENGN,WORCESTER,MA 01609. USN,RES LAB,WASHINGTON,DC 20375. RP LUO, H (reprint author), UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556, USA. RI Ram-Mohan, Ramdas/C-5167-2012 NR 11 TC 4 Z9 4 U1 1 U2 1 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 AUG PY 1993 VL 22 IS 8 BP 1103 EP 1106 DI 10.1007/BF02817532 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA LR505 UT WOS:A1993LR50500045 ER PT J AU SARPKAYA, T AF SARPKAYA, T TI COHERENT STRUCTURES IN OSCILLATORY BOUNDARY-LAYERS SO JOURNAL OF FLUID MECHANICS LA English DT Article ID NEAR-WALL TURBULENCE; PIPE-FLOW; STREAK FORMATION; SHEAR-FLOW; TRANSITION; VORTICES; NUMBER; WAVES AB An experimental investigation of the circumstances leading to the creation and subsequent evolution of the low-speed streaks and other quasi-coherent structures on a long cylindrical body immersed in a sinusoidally oscillating flow (Stokes flow) is described. The wall shear stress and the phase lead of the maximum wall shear over the maximum free-stream velocity have been measured to characterize the unsteady boundary layer. The evolution of a sinuous streak, from its inception to its ultimate demise, and the generation of multiple streaks, arches, hairpins, and other vortical structures have been traced through flow visualization. The results have shown that the strong pressure gradients, inflexion points in the velocity profile, and the reversal of the shear stress have profound effects on the stability of the flow. The Reynolds number (Re(delta) = U(max) delta/nu) delineates the boundaries of the laminar stable flow, transitional flow, and turbulent flow at the start of which the phase angle decreases sharply, the friction coefficient increases rapidly, and the turbulent motion prevails over larger fractions of the flow cycle. The transitional and turbulent states are rich with vortical motions which burst themselves into existence most intensely during the later stages of the deceleration phase. The effect of the manipulation of the viscosity of the wall-layer fluid on the creation and bifurcation of the low-speed streaks is discussed in some detail. RP SARPKAYA, T (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 65 TC 37 Z9 38 U1 0 U2 5 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD AUG PY 1993 VL 253 BP 105 EP 140 DI 10.1017/S0022112093001739 PG 36 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA LV212 UT WOS:A1993LV21200005 ER PT J AU BERNARD, PS THOMAS, JM HANDLER, RA AF BERNARD, PS THOMAS, JM HANDLER, RA TI VORTEX DYNAMICS AND THE PRODUCTION OF REYNOLDS STRESS SO JOURNAL OF FLUID MECHANICS LA English DT Article ID TURBULENT BOUNDARY-LAYER; VISCOUS WALL REGION; CHANNEL FLOW; SHEAR-FLOW; SIMULATION; EVOLUTION; VORTICITY; SMOOTH; FIELD AB The physical mechanisms by which the Reynolds shear stress is produced from dynamically evolving vortical structures in the wall region of a direct numerical simulation of turbulent channel flow are explored. The complete set of quasi-streamwise vortices are systematically located and tracked through the flow by the locus of the points of intersection of their centres of rotation with the (y, z) numerical grid planes. This approach assures positive identification of vortices of widely differing strengths, including those whose amplitude changes significantly in time. The process of vortex regeneration, and the means by which vortices grow, distort and interact over time are noted. Ensembles of particle paths arriving on fixed planes in the flow are used to represent the physical processes of displacement and acceleration transport (Bernard & Handler 1990a) from which the Reynolds stress is produced. By interweaving the most dynamically significant of the particle paths with the evolving vortical structures, the dynamical role of the vortices in producing Reynolds stress is exposed. This is found to include ejections of low-speed fluid particles by convecting structures and the acceleration and deceleration of fluid particles in the cores of vortices. Sweep dominated Reynolds stress close to the wall appears to be a manifestation of the regeneration process by which new vortices are created in the flow. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BERNARD, PS (reprint author), UNIV MARYLAND,DEPT MECH ENGN,COLL PK,MD 20742, USA. NR 36 TC 97 Z9 99 U1 2 U2 7 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD AUG PY 1993 VL 253 BP 385 EP 419 DI 10.1017/S0022112093001843 PG 35 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA LV212 UT WOS:A1993LV21200016 ER PT J AU SITZMANN, ME GILARDI, RD AF SITZMANN, ME GILARDI, RD TI POLYNITROALKYL DERIVATIVES OF SF5N=CCL2 - NITRATIONS OF SF5 IMINES SO JOURNAL OF FLUORINE CHEMISTRY LA English DT Article AB Polynitroalkyl SF5, imines have been synthesized from SF5N=CCl2 via nucleophilic substitution and nitration reactions. Only in one instance was the SF5 imino moiety (SF5N=C-) affected by a nitration reagent; the product was the fluorosulfonyl compound; very similar SF5 materials were not affected by the nitration reagent. The SF5N=C- moiety, when compared to the carbonyl group (O=C-), exhibited a strong tendency to lower the melting points of nitro compounds. The crystal structures of three SF5, imines and one fluorosulfonyl imine have been determined. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP SITZMANN, ME (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 13 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-1139 J9 J FLUORINE CHEM JI J. Fluor. Chem. PD AUG PY 1993 VL 63 IS 3 BP 203 EP 215 DI 10.1016/S0022-1139(00)80564-3 PG 13 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA LP188 UT WOS:A1993LP18800003 ER PT J AU KENNEDY, CA PIMENTEL, JA LEWIS, DE ANDERSON, MD WEISS, PJ OLDFIELD, EC AF KENNEDY, CA PIMENTEL, JA LEWIS, DE ANDERSON, MD WEISS, PJ OLDFIELD, EC TI CROSSOVER OF HUMAN IMMUNODEFICIENCY VIRUS-INFECTED PATIENTS FROM AEROSOLIZED PENTAMIDINE TO TRIMETHOPRIM-SULFAMETHOXAZOLE - LACK OF HEMATOLOGIC TOXICITY AND RELATIONSHIP OF SIDE-EFFECTS TO CD4+ LYMPHOCYTE COUNT SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID PNEUMOCYSTIS-CARINII PNEUMONIA; EXTRAPULMONARY PNEUMOCYSTOSIS; PROPHYLAXIS; AIDS; CHEMOPROPHYLAXIS; PNEUMOTHORAX; EFFICACY; COTRIMOXAZOLE; INTERMITTENT; PREVENTION AB Trimethoprim-sulfamethoxazole (TMP/SMZ) was given in a crossover study to 130 human immunodeficiency virus-infected patients who had been receiving aerosolized pentamidine; 86 (66%) successfully crossed over to TMP/SMZ without hypersensitivity reactions or hematologic toxicity. No significant changes occurred in mean hemoglobin concentration, leukocyte count, or platelet count between study enrollment and 12-month follow-up. Predominant side-effects, in 41 patients (33.8%), were fever and maculopapular rashes, which resolved promptly with discontinuation of TMP/SMZ. The mean time to first side effect was 12.3 days, and 86% of side effects developed within 30 days. Three patients experienced toxicity serious enough to warrant hospitalization. Of patients with less-than-or-equal-to 200 CD4+ lymphocytes/mm3 57% developed rashes after the crossover compared with only 27% of patients with higher CD4+ cell counts. Many patients currently receiving aerosolized pentamidine can be safely crossed over without hematologic toxicity or hypersensitivity reactions. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. RP KENNEDY, CA (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 27 TC 26 Z9 26 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD AUG PY 1993 VL 168 IS 2 BP 314 EP 317 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LN813 UT WOS:A1993LN81300008 PM 8101551 ER PT J AU RODIER, G GRAVIER, P SEVRE, JP BINSON, G OMAR, CS AF RODIER, G GRAVIER, P SEVRE, JP BINSON, G OMAR, CS TI MULTIDRUG-RESISTANT TUBERCULOSIS IN THE HORN OF AFRICA SO JOURNAL OF INFECTIOUS DISEASES LA English DT Letter C1 UNIV MARYLAND,SCH MED,INT HLTH PROGRAM,BALTIMORE,MD 21201. DJIBOUTI MINIST HLTH,CTR PAUL FAURE,DJIBOUTI,DJIBOUTI. FRENCH COOPERAT MISSION,DJIBOUTI,DJIBOUTI. RP RODIER, G (reprint author), USN,MED RES UNIT 3,DIV EPIDEMIOL,CAIRO,EGYPT. NR 7 TC 13 Z9 13 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD AUG PY 1993 VL 168 IS 2 BP 523 EP 524 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LN813 UT WOS:A1993LN81300054 PM 8336004 ER PT J AU HARBISON, BB AGGARWAL, ID AF HARBISON, BB AGGARWAL, ID TI HOT ISOSTATIC PRESSING OF FLUORIDE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL SYMP ON HALIDE GLASSES CY SEP 22-24, 1992 CL PERROS GUIREC, FRANCE SP ALCATEL ALSTHOM RECH, FRANCE TELECOM, CTR NATL ETUDES TELECOMMUN, CONSEIL REG BRETAGNE, CONSEIL GEN COTES ARMOR, OPTILAS AB Hot isostatic pressing (HIP) has been used in numerous material systems for the elimination of micro-porosity. This process has been developed for the removal of bubbles which result when casting fluoride glasses. Optimization of HIP parameters of times, temperatures, and pressures has been achieved without inducing crystallization or altering the geometry of the fluoride glass casting. Improvements in fluoride fiber strength and lower losses can result from HIP fluoride glass preforms prior to fiber drawing. RP HARBISON, BB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 3 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD AUG PY 1993 VL 161 BP 7 EP 9 DI 10.1016/0022-3093(93)90658-K PG 3 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA LU323 UT WOS:A1993LU32300003 ER PT J AU GRISCOM, DL AF GRISCOM, DL TI DEFECT CENTERS IN HEAVY-METAL FLUORIDE GLASSES - A REVIEW SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL SYMP ON HALIDE GLASSES CY SEP 22-24, 1992 CL PERROS GUIREC, FRANCE SP ALCATEL ALSTHOM RECH, FRANCE TELECOM, CTR NATL ETUDES TELECOMMUN, CONSEIL REG BRETAGNE, CONSEIL GEN COTES ARMOR, OPTILAS ID ELECTRON-SPIN RESONANCE; ZRF4 BASED GLASSES; ZRF4-BASED GLASSES; RADIATION; ESR AB A variety of paramagnetic defect centers are induced in heavy-metal fluoride glasses by ionizing radiations. The most fundamental of these are the F centers (neutral fluorine vacancies, which tend to associate with Zr4+ or Hf4+ ions) and the H centers (interstitial atomic fluorines, which in pure glasses inevitably combine with normal network F- ions to form F-3(2-) and/or F2- species). The most stable defects are those associated with impurities. The latter include F-type centers associated with Fe3+ and the following H-type centers: (FCl)-, Cl2-, (FBr)-, Br2-, O-(?), and O2-. All of these defects have been well characterized by electron spin resonance. RP GRISCOM, DL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 19 Z9 19 U1 2 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD AUG PY 1993 VL 161 BP 45 EP 51 DI 10.1016/0022-3093(93)90667-M PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA LU323 UT WOS:A1993LU32300012 ER PT J AU SANGHERA, JS NGUYEN, VQ MIKLOS, R AGGARWAL, ID AF SANGHERA, JS NGUYEN, VQ MIKLOS, R AGGARWAL, ID TI MEASUREMENT OF BULK ABSORPTION-COEFFICIENTS OF CHALCOGENIDE AND CHALCOHALIDE GLASSES AT 10.6-MU-M USING CO2-LASER CALORIMETRY SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL SYMP ON HALIDE GLASSES CY SEP 22-24, 1992 CL PERROS GUIREC, FRANCE SP ALCATEL ALSTHOM RECH, FRANCE TELECOM, CTR NATL ETUDES TELECOMMUN, CONSEIL REG BRETAGNE, CONSEIL GEN COTES ARMOR, OPTILAS AB The bulk absorption coefficients of chalcogenide and chalcohalide glasses at 10.6 mum have been measured using CO2 laser calorimetry. The results indicate that processing of as-received chemicals is necessary to lower the impurity oxide content of the glasses and consequently the absorption coefficient at 10.6 mum. C1 VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. SFA INC,LANDOVER,MD 20785. RP SANGHERA, JS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 5 Z9 5 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD AUG PY 1993 VL 161 BP 320 EP 322 DI 10.1016/0022-3093(93)90728-G PG 3 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA LU323 UT WOS:A1993LU32300073 ER PT J AU LAFFERTY, TA GHER, ME GRAY, JL AF LAFFERTY, TA GHER, ME GRAY, JL TI COMPARATIVE SEM STUDY ON THE EFFECT OF ACID ETCHING WITH TETRACYCLINE HCL OR CITRIC-ACID ON INSTRUMENTED PERIODONTALLY-INVOLVED HUMAN ROOT SURFACES SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE ACID ETCHING, DENTAL; TOOTH ROOT; TETRACYCLINE THERAPEUTIC USE; CITRIC ACID; PLANING METHODS; SCALING METHODS ID BIOCHEMICAL APPROACH; DENTIN; ATTACHMENT; REGENERATION; INVITRO; DOGS; HYDROCHLORIDE; REPAIR AB THIS STUDY COMPARED THE SURFACE CHARACTERISTICS of periodontally diseased single-rooted human teeth extracted after treatment with either tetracycline HCl or citric acid solutions. The study group was comprised of 30 teeth from 22 patients with advanced periodontal disease extracted before the start of periodontal therapy. Diseased surfaces were identified, outlined, and root planed by hand curet or finishing bur. The teeth were sectioned and solutions of tetracycline HCl or citric acid (pH 1) were applied to the surfaces with cotton pellets for 5 minutes. Extracted teeth were processed and root surface samples then examined by scanning electron microscope. The surfaces of both acid-treated sets of specimens differed considerably from specimens treated with root planing alone, regardless of root planing method. Acid-treated specimens exhibited dentinal tubules exposed by the removal of the smear layer, surfaces devoid of the debris normally present in root planed-only specimens, and the dense network of collagen fibers that make up the dentin structure. Although differences were seen in surface depressions and fiber-like structures among some specimens, the tetracycline HCl and citric acid solutions produced comparable morphologic characteristics. C1 NATL NAVAL DENT CTR,NAVAL DENT SCH,DEPT PERIODONT,BETHESDA,MD 20889. BRANCH DENT CLIN,ROTA,SPAIN. RP LAFFERTY, TA (reprint author), USN ACAD,BRANCH DENT CLIN,DEPT PERIODONT,101 SANDS RD,ANNAPOLIS,MD 21402, USA. NR 22 TC 28 Z9 30 U1 0 U2 0 PU AMER ACAD PERIODONTOLOGY PI CHICAGO PA 737 NORTH MICHIGAN AVENUE, SUITE 800, CHICAGO, IL 60611-2690 SN 0022-3492 J9 J PERIODONTOL JI J. Periodont. PD AUG PY 1993 VL 64 IS 8 BP 689 EP 693 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LV691 UT WOS:A1993LV69100002 PM 8410605 ER PT J AU SHIN, YS WATSON, SJ KIM, KS AF SHIN, YS WATSON, SJ KIM, KS TI PASSIVE VIBRATION CONTROL SCHEME USING CIRCULAR VISCOELASTIC WAVE-GUIDE ABSORBERS SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB A waveguide absorber is a device mounted on a vibrating structure at the selected points to transfer energy from the structure to the device which dampens the energy. The waveguide absorbers reported here are made of viscoelastic material which absorbs vibration energy and dissipates it in the form of heat. The novelty of this approach to damping is the simplicity of application and the effectiveness in the broadband frequency range with relatively less material. In this study, the impedances of the circular viscoelastic waveguide absorbers were evaluated experimentally at different temperatures and the results were compared with those of prediction. The application of the waveguide absorbers in the most effective manner to maximize damping of the structure is also studied. The impedance matching techniques were studied to minimize the vibration amplitude of the structure. RP SHIN, YS (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA, USA. NR 7 TC 0 Z9 0 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1993 VL 115 IS 3 BP 256 EP 261 DI 10.1115/1.2929525 PG 6 WC Engineering, Mechanical SC Engineering GA LT583 UT WOS:A1993LT58300007 ER PT J AU KWON, YW SERTTUNC, M AF KWON, YW SERTTUNC, M TI STATIC AND DYNAMIC BUCKLING OF A FIBER EMBEDDED IN A MATRIX WITH INTERFACE DEBONDING SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID COMPOSITE AB Analyses were performed for static and dynamic buckling of a continuous fiber embedded in a matrix in order to determine effects of interfacial debonding on the critical buckling load and the domain of instability. A beam on elastic foundation model was used for the study. The study showed that a local interfacial debonding between a fiber and a surrounding matrix resulted in an increase of the wavelength of the buckling mode. An increase of the wavelength yielded a decrease of the static buckling load and lowered the dynamic instability domain. In general, the effect of a partial or complete interfacial debonding on the domain of dynamic instability was more significant than its effect on the static buckling load. For dynamic buckling of a fiber, a local debonding of size 10 to 20 percent of the fiber length had the most important influence on the domains of dynamic instability regardless of the location of debonding and the boundary conditions of the fiber. For static buckling, the location of a local debonding was critical to a free, simply supported fiber, but not to a fiber with both ends simply supported. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 16 TC 0 Z9 0 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1993 VL 115 IS 3 BP 297 EP 301 DI 10.1115/1.2929531 PG 5 WC Engineering, Mechanical SC Engineering GA LT583 UT WOS:A1993LT58300013 ER PT J AU NORDHAM, DJ KALDOR, LM AF NORDHAM, DJ KALDOR, LM TI DESIGN PROCEDURE FOR STRESS INTENSIFICATION FACTORS OF 90-DEGREES CURVED PIPE HAVING VARIOUS TANGENT LENGTHS SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB A simple design procedure, based on 114 finite element analyses, was derived to Predict the stress intensification factor for 90-deg curved pipe with end constraints composed of tangents of any length terminated by rigid flanges and no internal pressure loads. The results of this design procedure were then compared to stress intensification factors obtained from additional finite element analyses and experimental work. Stress intensification factors calculated using the design equations in the Power Piping Code (ANSI/ASME B31.1-1986) were also compared to all the finite element and experimental work. It was found that this design procedure more accurately predicts the stress intensification factors than the Power Piping Code. RP NORDHAM, DJ (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,MACHINERY RES & DEV DIRECTORATE,ANNAPOLIS,MD 21402, USA. NR 24 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1993 VL 115 IS 3 BP 313 EP 318 DI 10.1115/1.2929533 PG 6 WC Engineering, Mechanical SC Engineering GA LT583 UT WOS:A1993LT58300015 ER PT J AU NORDHAM, DJ KALDOR, LM AF NORDHAM, DJ KALDOR, LM TI DESIGN PROCEDURE FOR FLEXIBILITY FACTORS OF 90-DEGREES CURVED PIPE HAVING VARIOUS TANGENT LENGTHS SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB A simple design procedure, based on 175 finite element analyses, was derived to predict the flexibility factor due to an in-plane or out-of-plane moment for a 90-deg curved pipe with end constraints composed of tangents of any length terminated by rigid flanges and no internal pressure loads. The results of this design procedure were then compared to flexibility factors obtained from additional finite element analyses and experimental work. Flexibility factors calculated using the design equations in the Power Piping Code (ANSI/ASME B31.1-1986) were also compared to all finite element and experimental work. It was found that this design procedure more accurately predicts the flexibility factors than the Power Piping Code. RP NORDHAM, DJ (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,MACHINERY RES & DEV DIRECTORATE,ANNAPOLIS,MD 21402, USA. NR 26 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1993 VL 115 IS 3 BP 319 EP 324 DI 10.1115/1.2929534 PG 6 WC Engineering, Mechanical SC Engineering GA LT583 UT WOS:A1993LT58300016 ER PT J AU DECREDICO, MA AF DECREDICO, MA TI THE ROUGH SIDE OF WAR - THE CIVIL-WAR JOURNAL OF MOSMAN,CHESLEY,A., 1ST LIEUTENANT, COMPANY-D, 59TH ILLINOIS VOLUNTEER INFANTRY REGIMENT - GATES,A SO JOURNAL OF SOUTHERN HISTORY 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 SOUTHERN HISTORICAL ASSN PI ATHENS PA UNIV GEORGIA HISTORY DEPT, ATHENS, GA 30602 SN 0022-4642 J9 J SOUTHERN HIST JI J. South. Hist. PD AUG PY 1993 VL 59 IS 3 BP 561 EP 562 DI 10.2307/2210046 PG 2 WC History SC History GA LR448 UT WOS:A1993LR44800046 ER PT J AU WARREN, G MALVAR, LJ AF WARREN, G MALVAR, LJ TI LATERAL DISTRIBUTION OF LOADS IN ONE-WAY CONTINUOUS NAVY PIER DECKS SO JOURNAL OF STRUCTURAL ENGINEERING-ASCE LA English DT Article AB Distribution of wheel loads in concrete bridges has been addressed by AASHTO using the effective-width concept, whereby the load is assumed to be laterally distributed over a width E function of the span and limited to 2.1 m (7 ft). A military handbook addressing flat-slab pier-deck design to distribute truck-crane outrigger loads recommends following these guidelines, although it recognizes that resulting designs are overly conservative. An initial finite element-parameter study is carried out in an attempt to determine more appropriate effective-widths values. Inservice pier tests are conducted to corroborate the numerical predictions. From these analyses and test results, a one-third scale laboratory model using an effective-width value of 3 m (10 ft) is designed, constructed, and tested. Classical plate-theory solutions and finite element analyses using various edge conditions, cracked and uncracked deck properties, as well as point and patch loads are completed. Analyses and tests results confirmed that 'effective-width values for reinforced concrete slabs can often be doubled over current AASHTO allowables. For Navy pier-deck designs where large, truck-mounted cranes dominate load requirements, this will result in higher load capacity, longer spans, and less construction materials. C1 UNIV CALIF DAVIS,DEPT CIVIL ENGN,DAVIS,CA 95616. RP WARREN, G (reprint author), USN,CIVIL ENGN LAB,560 LAB DR,PORT HUENEME,CA 93043, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9445 J9 J STRUCT ENG-ASCE JI J. Struct. Eng.-ASCE PD AUG PY 1993 VL 119 IS 8 BP 2332 EP 2348 DI 10.1061/(ASCE)0733-9445(1993)119:8(2332) PG 17 WC Construction & Building Technology; Engineering, Civil SC Construction & Building Technology; Engineering GA LM927 UT WOS:A1993LM92700004 ER PT J AU MITCHELL, DL GUBSER, DU AF MITCHELL, DL GUBSER, DU TI INDUCTION-DRIVE MAGNETOHYDRODYNAMIC PROPULSION SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE MARINE PROPULSION; MHD PROPULSION; MAGNETOHYDRODYNAMIC PUMPS; INDUCTION-DRIVE PROPULSION; RIPPLE MOTOR; HIGH-TEMPERATURE SUPERCONDUCTORS; ELECTROMAGNETS AB The use of magnetohydrodynamic propulsion for marine applications is reviewed with emphasis on induction-drive systems such as the ''ripple'' motor. Comparisons are made with direct-drive MHD propulsion systems. Application to pumps for hazardous fluids and liquid-metal coolants are also discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MITCHELL, DL (reprint author), MITCHELL ASSOCIATES,POB 2337,RESTON,VA 22090, USA. NR 12 TC 1 Z9 1 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD AUG PY 1993 VL 6 IS 4 BP 227 EP 235 DI 10.1007/BF00626262 PG 9 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MC608 UT WOS:A1993MC60800003 ER PT J AU FLETCHER, MA MCKENNA, TM QUANCE, JL WAINWRIGHT, NR WILLIAMS, TJ AF FLETCHER, MA MCKENNA, TM QUANCE, JL WAINWRIGHT, NR WILLIAMS, TJ TI LIPOPOLYSACCHARIDE DETOXIFICATION BY ENDOTOXIN NEUTRALIZING PROTEIN SO JOURNAL OF SURGICAL RESEARCH LA English DT Article ID GRAM-NEGATIVE BACTEREMIA; HORSESHOE-CRAB; ANTILIPOPOLYSACCHARIDE FACTOR; ESCHERICHIA-COLI; SHOCK; NOREPINEPHRINE; MECHANISMS; RABBITS; CELLS; RAT C1 ASSOCIATES CAPE COD INC,WOODS HOLE,MA 02543. RP FLETCHER, MA (reprint author), USN,MED RES INST,SEPT SHOCK RES PROGRAM,MS 42,BETHESDA,MD 20889, USA. NR 31 TC 17 Z9 19 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4804 J9 J SURG RES JI J. Surg. Res. PD AUG PY 1993 VL 55 IS 2 BP 147 EP 154 DI 10.1006/jsre.1993.1122 PG 8 WC Surgery SC Surgery GA MC024 UT WOS:A1993MC02400006 PM 8412093 ER PT J AU ZAIN, SJ THOMPSON, W KAHN, M AF ZAIN, SJ THOMPSON, W KAHN, M TI CONSTRUCTION AND EVALUATION OF A NOISE-SUPPRESSING HYDROPHONE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The construction and evaluation of an acoustic sensor is described which consists of two small pieces of piezoceramic bonded together with their poling axes collinear, one piece containing ordered microvoids, the other solid. Electrical leads attached to each piece allow their outputs to be separately processed. The solid piece has a small hydrostatic voltage coefficient while the voided has a significantly larger voltage coefficient. Both have appreciable responses to vibration excitation along their poling axes. Hence, if the two electrical outputs are appropriately weighted, phase reversed, and then combined, the net response to vibration excitation should be negligible while the net response to an incident pressure wave should be essentially that of the voided piece alone. Hence, the assembly should function simultaneously as a poor accelerometer but a good hydrophone. The data show that at least 10 dB of vibration response cancellation and a large, nearly uniform, free-field voltage sensitivity are achieved over the frequency range from 5 to 20 kHz. C1 PENN STATE UNIV,DEPT ENGN SCI & MECH,UNIV PK,PA 16802. PENN STATE UNIV,APPL RES LAB,UNIV PK,PA 16802. USN,RES LAB,WASHINGTON,DC 20375. RP ZAIN, SJ (reprint author), PENN STATE UNIV,GRAD PROGRAM ACOUST,UNIV PK,PA 16802, USA. NR 6 TC 0 Z9 0 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1993 VL 94 IS 2 BP 642 EP 645 DI 10.1121/1.406880 PN 1 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400003 ER PT J AU PIQUETTE, JC AF PIQUETTE, JC TI APPLICATIONS OF THE METHOD FOR TRANSDUCER TRANSIENT SUPPRESSION TO VARIOUS TRANSDUCER TYPES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Recently, a new method for suppressing the transient pressure radiation ordinarily produced by a projector in response to drive turnon and turnoff has been described [J. C. Piquette, ''Method for transducer transient suppression I. Theory '' J. Acoust. Soc. Am. 92, 1203-1213 (1992) and ''II Experiment,'' J. Acoust. Soc. Am. 92,1214-1221 (1992)]. The experiments described in the earlier reports involved application of the method primarily to piezoelectric spherical transducers, although one preliminary application to an array of piezoelectric tubes was also considered. The present work involved the application of the method to a variety of transducer types to which the method had not been applied previously. These types are (i) flexural disk, (ii) Helmholtz resonator, (iii) moving coil, (iv) inductor-tuned Tonpilz, and (v) a dual transducer array of piezoelectric squares and disks. A high degree of transient suppression was observed in all units that were tested. Equivalent circuits useful for designing the transient-suppressing drive are also provided. RP PIQUETTE, JC (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 8 TC 4 Z9 5 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 AUG PY 1993 VL 94 IS 2 BP 646 EP 651 DI 10.1121/1.406881 PN 1 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400004 ER PT J AU SWIFT, GW KEOLIAN, RM AF SWIFT, GW KEOLIAN, RM TI THERMOACOUSTICS IN PIN-ARRAY STACKS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB A new thermoacoustic stack geometry, the pin array, is described. Analytical expressions for velocity and temperature in the pin array are derived, and potential advantages of the pin stack are demonstrated. C1 USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. RP SWIFT, GW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 11 TC 38 Z9 44 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 AUG PY 1993 VL 94 IS 2 BP 941 EP 943 DI 10.1121/1.408196 PN 1 PG 3 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400037 ER PT J AU MILLER, JH LYNCH, JF CHIU, CS WESTREICH, EL GERBER, JS HIPPENSTIEL, R CHAULK, E AF MILLER, JH LYNCH, JF CHIU, CS WESTREICH, EL GERBER, JS HIPPENSTIEL, R CHAULK, E TI ACOUSTIC MEASUREMENTS OF SURFACE GRAVITY-WAVE SPECTRA IN MONTEREY BAY USING MODE TRAVEL-TIME FLUCTUATIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SEA-SURFACE; OCEAN; TOMOGRAPHY; SCATTERING; FLORIDA; STRAITS; BUOY AB Earlier work by Miller et al. [J. Acoust. Soc. Am. 86, 326-345 (1989)] suggested that the surface gravity wave frequency-direction spectrum could be measured using acoustic tomography signals. An experiment was performed in Monterey Bay, California, from 12-16 December 1988 to validate this earlier work. During that period, an acoustic tomography source with a center frequency of 224 Hz and bandwidth of 16 Hz was deployed, continuously repeating its coded transmissions every 1.9375 s. The transmissions were received on a number of modified sonobuoys placed on the continental shelf at a range of approximately 55 km. Although the acoustic propagation was complicated by the presence of the Monterey Submarine Canyon, a hybrid ray and mode interpretation explains the observations. The main effect of the surface waves on the acoustic signals is determined to occur in the shallow continental shelf portion of the path. On the shelf, it is shown that the resolved acoustic normal modes exhibit the fluctuations in travel time described in our earlier work. The acoustic measurements of the surface wave spectrum compared well with measurements made by a pitch-roll wave buoy maintained in the area by the National Data Buoy Center (NDBC). The acoustic and buoy spectra agreed well on the location of the peak swell frequency; the root-mean-square (rms) wave amplitudes from the two measures agreed to within 7%. C1 WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. RP MILLER, JH (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC MR,MONTEREY,CA 93943, USA. OI Miller, James H./0000-0001-7156-3589 NR 35 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1993 VL 94 IS 2 BP 954 EP 974 DI 10.1121/1.408198 PN 1 PG 21 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400039 ER PT J AU COLLINS, MD AF COLLINS, MD TI AN ENERGY-CONSERVING PARABOLIC EQUATION FOR ELASTIC MEDIA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID PENETRABLE BOTTOM; WAVE-PROPAGATION; OCEAN; ACOUSTICS; DEPTH AB The accuracy of the parabolic equation (PE) method is improved for range-dependent elastic media. The energy-conserving elastic PE is a generalization of the energy-conserving acoustic PE. A range-dependent waveguide is approximated by a sequence of range-independent regions. A linear approximation is derived for the nonlinear condition corresponding to conservation of compressional energy flux at the vertical interfaces between range-independent regions. The rotated elastic PE is applied to generate reference solutions for demonstrating accuracy. The energy-conserving elastic PE is applied to solve problems involving the propagation of an interface wave along a sloping ocean bottom and a problem involving mode cutoff and coupling into shear wave beams in the ocean bottom. The latter problem is analogous to a cutoff problem that was first solved with the acoustic PE [F. B. Jensen and W. A. Kuperman, J. Acoust. Soc. Am. 67, 1564-1566 (1980)]. RP COLLINS, MD (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 19 TC 55 Z9 59 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1993 VL 94 IS 2 BP 975 EP 982 DI 10.1121/1.408199 PN 1 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400040 ER PT J AU MAKRIS, NC AF MAKRIS, NC TI IMAGING OCEAN-BASIN REVERBERATION VIA INVERSION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB A technique for imaging large areas of the ocean floor by inverting reverberation data is presented. Acoustic returns measured on a horizontally towed line array have right-left ambiguity about the array's axis and decreasing cross-range resolution for off-broadside beams and more distant scattering sites. By optimal use of data taken with differing array locations and orientations, right-left ambiguity is eliminated and resolution is maximized. This is accomplished via a global inversion using the array's known resolving properties. The output of the inversion can be optimally resolved reverberation, scattering coefficient, or physical properties of the seafloor, depending upon the formulation. Simulations are presented to show the general superiority of this approach to data averaging. RP MAKRIS, NC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 15 Z9 16 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 AUG PY 1993 VL 94 IS 2 BP 983 EP 993 DI 10.1121/1.408200 PN 1 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400041 ER PT J AU BROADHEAD, MK FIELD, RL LECLERE, JH AF BROADHEAD, MK FIELD, RL LECLERE, JH TI SENSITIVITY OF THE DECONVOLUTION OF ACOUSTIC TRANSIENTS TO GREEN-FUNCTION MISMATCH SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID TIME-DOMAIN SOLUTION AB In this paper various measurements of acoustic tine series recorded in the Atlantic over source-to-receiver ranges of 600 to 12 900 m are analyzed. The transmitted source signature with a monitor hydrophone mounted on the source array was also recorded. The signature distortion introduced by propagation effects was treated by the use of single-channel deconvolution. In situations where the Green's function structure is simple (e.g., direct arrival and surface reflection), single-channel deconvolution gave satisfactory results. When multipath effects (due to interaction with layered bottom sediments) were present, it was difficult to get a good source estimate. A way was developed of perturbing the Green's functions such that the source estimates were guaranteed to improve. In most cases it was found that very small changes could produce significant improvement in the source estimates. This sensitivity was quantified by using the correlation coefficient. This sensitivity is not to be confused with the well-known fact that the single-channel deconvolution problem is ill-posed. That issue was treated separately. RP BROADHEAD, MK (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 14 TC 8 Z9 8 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 AUG PY 1993 VL 94 IS 2 BP 994 EP 1002 DI 10.1121/1.408201 PN 1 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400042 ER PT J AU YANG, TC HAYWARD, TJ AF YANG, TC HAYWARD, TJ TI LOW-FREQUENCY ARCTIC REVERBERATION .3. MEASUREMENT OF ICE AND BOTTOM BACKSCATTERING STRENGTHS FROM MEDIUM-RANGE BOTTOM-BOUNCE RETURNS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SHALLOW AB Backscattering strength measurements are usually extracted from short-range reverberation data using direct-path returns or from long-range reverberation data for which the dominant source of reverberation (e.g., a bottom seamount) is known. The small area ensonified by short-range direct paths provides only a relatively small data sample for backscattering strength estimates. While long-range data cover a much larger area, the returns from the surface and bottom are not always easily identified in the data. In the Arctic both the surface (ice) and bottom contribute significantly to the reverberation at low frequencies. The contributions of ice and bottom must be separated by signal processing means before their backscattering strengths can be measured separately. In this paper a method to separately measure the surface and bottom backscattering strengths using medium-range (5- to 20-km) reverberation data is investigated. The method of separation is based on the time versus vertical arrival angle contours associated with bottom-bounce propagation paths. Separation of surface and the bottom backscattering returns is most straightforward for a vertical array. It is noted that a (low tilt) vertical array has been shown to be a practical tool for collecting reverberation data in the Arctic. By extending analysis to medium-range reverberation data, backscattering data samples can be significantly increased. The ice backscattering strengths are estimated at 23 Hz from the CEAREX 89 reverberation data and the results are compared with the Burke-Twersky model, in which surface roughness is modeled by elliptic half-cylindrical protuberances on a pressure-release surface. Bottom backscattering strengths are also obtained at 23 Hz, and are found to be consistent with Lambert's law within the experimental errors. RP YANG, TC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 2 Z9 2 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1993 VL 94 IS 2 BP 1003 EP 1014 DI 10.1121/1.406948 PN 1 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400043 ER PT J AU RUMERMAN, ML AF RUMERMAN, ML TI INCREASED ACCURACY IN THE APPLICATION OF THE SOMMERFELD-WATSON TRANSFORMATION TO SCATTERING OF ACOUSTIC-WAVES FROM SPHERICAL-SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID CYLINDRICAL-SHELLS; BACKSCATTERING AB The Sommerfeld-Watson transformation (SWT) is applied to the normal mode series for scattering of an incident plane acoustic wave from a spherical elastic shell to express the scattered field in terms of its wave components. The ''geometric'' part of the scattered field is extracted and expressed as a line integral which is evaluated by shifting to a path of steepest descent (SDP). When deforming the path, one or more poles of the integrand may be crossed and their residues must be accounted for, resulting in discontinuities in the computed field unless the effects of these poles are also included in the evaluation of the SDP integral. Although the asymptotic form of the Legendre function used in the evaluation of the SDP integral is singular and invalid near the direction of backscatter, it is found that its use yields a finite and correct result for the pole correction, as well as for the saddle point approximation. This approach is applied to a thin steel shell in water using thin shell theory, and good agreement is obtained for scattering into the backward half-space between the results of the normal mode series, using shell theory, and the modified SWT calculation for ka > 3. RP RUMERMAN, ML (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,BETHESDA,MD 20084, USA. NR 19 TC 8 Z9 8 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 AUG PY 1993 VL 94 IS 2 BP 1110 EP 1120 DI 10.1121/1.406958 PN 1 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400053 ER PT J AU SHIRRON, JJ AF SHIRRON, JJ TI AN ITERATIVE SOLUTION SCHEME FOR THE EXTERIOR NEUMANN PROBLEM FOR DELTA+KAPPA-2 USING FINITE-ELEMENTS IN A BOUNDED DOMAIN SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID RADIATION AB A scheme is given for approximating the solution of the exterior Neumann problem for the Helmholtz equation that employs the finite element method in an artificially truncated domain. A sequence of approximate solutions is produced by iteration. The current iterate is used to compute a boundary condition on the truncating surface for the next iterate. While precise conditions under which the proposed method is convergent are not yet known, numerical experiments indicate its robustness. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 13 TC 3 Z9 3 U1 0 U2 0 PU ACOUSTICAL SOC AMER AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0001-4966 EI 1520-8524 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1993 VL 94 IS 2 BP 1121 EP 1125 DI 10.1121/1.406959 PN 1 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA LT174 UT WOS:A1993LT17400054 ER PT J AU HAYES, JL WILLIAMS, RT RENNICK, MA AF HAYES, JL WILLIAMS, RT RENNICK, MA TI LEE CYCLOGENESIS .2. NUMERICAL-STUDIES SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID EQUATIONS; WAVES AB The effect of topography on the evolution of a disturbance in a baroclinically unstable mean flow is studied using a three-dimensional primitive equation model. A procedure is developed to compare control integrations with no topography with integrations that contain topography. It is found that lee cyclogenesis is caused primarily by the superposition of a growing baroclinic wave with a steady, orographically forced wave of the same scale. Some additional lee growth is found that may be orographically enhanced, or it may be related to certain small problems in the experimental set up. As the disturbances move over the ridge, they are deflected to the north on the upwind side before returning to their original latitudes on the lee side. The numerical results in this paper are in general agreement with the authors' previous analytic study. C1 NAVAL POSTGRAD SCH,DEPT METEOROL 63WU,MONTEREY,CA 93943. NR 22 TC 7 Z9 7 U1 0 U2 0 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 AUG 1 PY 1993 VL 50 IS 15 BP 2354 EP 2368 DI 10.1175/1520-0469(1993)050<2354:LCPINS>2.0.CO;2 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LQ761 UT WOS:A1993LQ76100003 ER PT J AU PROKES, SM GLEMBOCKI, OJ AF PROKES, SM GLEMBOCKI, OJ TI LIGHT-EMISSION PROPERTIES OF POROUS SILICON SO MATERIALS CHEMISTRY AND PHYSICS LA English DT Review ID HYDROGENATED AMORPHOUS-SILICON; VISIBLE LUMINESCENCE; PHOTOLUMINESCENCE; SI; FILMS; DIFFRACTION; MECHANISM; RAMAN; ELECTROLUMINESCENCE; MICROSTRUCTURE AB Visible light emission in porous silicon is of current interest both scientifically and technologically. Since this system can exhibit a wide variety of structures and particle sizes, however, a large volume of data exists, which at times can be quite contradictory. In this paper, a review of the general properties of porous silicon that have been reported thus far will be given, along with a discussion of the possible mechanisms for the luminescence process. The model of quantum confinement, amorphous silicon luminescence, a polysilane mechanism and the siloxene model will be discussed, along with the support for and drawbacks of each particular model. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 73 TC 26 Z9 27 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0254-0584 J9 MATER CHEM PHYS JI Mater. Chem. Phys. PD AUG PY 1993 VL 35 IS 1 BP 1 EP 10 DI 10.1016/0254-0584(93)90167-K PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA LP402 UT WOS:A1993LP40200001 ER PT J AU SAKS, NS KLEIN, RB AF SAKS, NS KLEIN, RB TI EFFECTS OF HYDROGEN ANNEALING AFTER CHANNEL HOT-CARRIER STRESS SO MICROELECTRONIC ENGINEERING LA English DT Article; Proceedings Paper CT 8TH BIENNIAL CONF ON INSULATING FILMS ON SEMICONDUCTORS CY JUN 02-05, 1993 CL DELFT, NETHERLANDS SP ELSEVIER, DELFT UNIV TECHNOL, FDN FUNDAMENTAL STUDIES MATTER, PHILIPS RES, COMMISS EUROPEAN COMMUNITIES RP SAKS, NS (reprint author), USN,RES LAB,CODE 6813,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9317 J9 MICROELECTRON ENG JI Microelectron. Eng. PD AUG PY 1993 VL 22 IS 1-4 BP 265 EP 268 DI 10.1016/0167-9317(93)90170-A PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Optics; Physics, Applied SC Engineering; Science & Technology - Other Topics; Optics; Physics GA LV299 UT WOS:A1993LV29900051 ER PT J AU COLLINS, SP POPE, RK SCHEETZ, RW RAY, RI WAGNER, PA LITTLE, BJ AF COLLINS, SP POPE, RK SCHEETZ, RW RAY, RI WAGNER, PA LITTLE, BJ TI ADVANTAGES OF ENVIRONMENTAL SCANNING ELECTRON-MICROSCOPY IN STUDIES OF MICROORGANISMS SO MICROSCOPY RESEARCH AND TECHNIQUE LA English DT Article DE ENVIRONMENTAL SCANNING ELECTRON MICROSCOPY; ALGAE; FUNGI ID SEM AB Microorganisms, including bacteria, fungi, protozoa, and microalgae, are composed predominantly of water which prohibits direct observation in a traditional scanning electron microscope (SEM). Preparation for SEM requires that microorganisms be fixed, frozen or dehydrated, and coated with a conductive film before observation in a high vacuum environment. Sample preparation may mechanically disturb delicate samples, compromise morphological information, and introduce other artifacts. The environmental scanning electron microscope (ESEM) provides a technology for imaging hydrated or dehydrated biological samples with minimal manipulation and without the need for conductive coatings. Sporulating cultures of three fungi, Aspergillus sp., Cunninghamella sp., and Mucor sp., were imaged in the ESEM to assess usefulness of the instrument in the direct observation of delicate, uncoated, biological specimens. Asexual sporophores showed no evidence of conidial displacement or disruption of sporangia. Uncoated algal cells of Euglena gracilis and Spirogyra sp. were examined using the backscatter electron detector (BSE) and the environmental secondary electron detector (ESD) of the ESEM. BSE images had more clearly defined intracellular structures, whereas ESD gave a clearer view of the surface. E. gracilis cells fixed with potassium permanganate, Spirogyra sp. stained with Lugol's solution, and Saprolegnia sp. fixed with osmium tetroxide were compared using BSE and ESD to demonstrate that cellular details could be enhanced by the introduction of heavy metals. The effect of cellular water on signal quality was evaluated by comparing hydrated to critical point dried specimens. (C) 1993 Wiley-Liss, Inc. C1 UNIV SO MISSISSIPPI,DEPT BIOL SCI,HATTIESBURG,MS 39406. USN,RES LAB DETACHMENT,BAY ST LOUIS,MS 39529. NR 10 TC 46 Z9 53 U1 2 U2 27 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 1059-910X J9 MICROSC RES TECHNIQ JI Microsc. Res. Tech. PD AUG PY 1993 VL 25 IS 5-6 BP 398 EP 405 DI 10.1002/jemt.1070250508 PG 8 WC Anatomy & Morphology; Biology; Microscopy SC Anatomy & Morphology; Life Sciences & Biomedicine - Other Topics; Microscopy GA LN846 UT WOS:A1993LN84600007 PM 8400431 ER PT J AU LEEDHAM, CS BLOOD, CG NEWLAND, C AF LEEDHAM, CS BLOOD, CG NEWLAND, C TI A DESCRIPTIVE ANALYSIS OF WOUNDS AMONG UNITED-STATES MARINES TREATED AT 2ND-ECHELON FACILITIES IN THE KUWAITI THEATER OF OPERATIONS SO MILITARY MEDICINE LA English DT Article AB Medical data from 120 U.S. Marine Corps trauma admissions to second-echelon facilities during Operation Desert Shield/Storm were examined. Sixty-five percent of the admissions occurred between February 22 and February 28, the time frame corresponding to the ground war and the preliminary mobilization period. Penetrating wounds were the most prevalent types of injury, followed by lacerations, open fractures, and closed fractures. The most frequent anatomical regions sustaining injuries were the leg, head, hand, and arm. Fragments were the causative agent of 63% of the admissions that had this variable recorded, while gunfire was the cause in 20% of the cases. The median injury-to-admission interval increased from 0.67 hours in the non-ground war period to 4.41 during the ground war. C1 USN,HLTH RES CTR,MED INFORMAT SYST & OPERAT RES DEPT,POB 85122,SAN DIEGO,CA 92186. NR 0 TC 25 Z9 26 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 AUG PY 1993 VL 158 IS 8 BP 508 EP 512 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA LT492 UT WOS:A1993LT49200012 PM 8414070 ER PT J AU SASHEGYI, KD HARMS, DE MADALA, RV RAMAN, S AF SASHEGYI, KD HARMS, DE MADALA, RV RAMAN, S TI APPLICATION OF THE BRATSETH SCHEME FOR THE ANALYSIS OF GALE DATA USING A MESOSCALE MODEL SO MONTHLY WEATHER REVIEW LA English DT Article ID ATLANTIC LOWS EXPERIMENT; DATA ASSIMILATION; ANALYSIS SYSTEM; GENESIS AB The successive correction scheme of Bratseth, which converges to optimum interpolation, is applied for the numerical analysis of data collected during the Genesis of Atlantic Lows Experiment. A first guess for the analysis is provided by a 12-h forecast produced by integrating a limited-area model from a prior coarse operational analysis. Initially, univariate analyses of the mass and wind fields are produced. To achieve the coupling of the mass and wind fields, additional iterations on the geopotential are performed by extrapolating the geopotential to grid points, using improving estimates of the geostrophic wind. This improved geostrophic wind is then used to update the geostrophic component of the initial univariate wind analysis. Use of a background forecast produces much improved mesoscale structures in the analysis. Enhanced gradients of the geopotential and larger wind shears are the result of the coupling of the mass and wind fields, particularly in regions of lower data density. Application of the vertical mode initialization scheme of Bourke and McGregor is used to diagnose the divergent component of the mesoscale circulations produced with the analysis scheme. C1 SCI APPLICAT INT CORP,MCLEAN,VA. N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI,RALEIGH,NC 27695. USN,RES LAB,WASHINGTON,DC 20375. NR 35 TC 10 Z9 11 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 AUG PY 1993 VL 121 IS 8 BP 2331 EP 2350 DI 10.1175/1520-0493(1993)121<2331:AOTBSF>2.0.CO;2 PG 20 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LP877 UT WOS:A1993LP87700010 ER PT J AU HOGAN, TF BRODY, LR AF HOGAN, TF BRODY, LR TI SENSITIVITY STUDIES OF THE NAVY GLOBAL FORECAST MODEL PARAMETERIZATIONS AND EVALUATION OF IMPROVEMENTS TO NOGAPS SO MONTHLY WEATHER REVIEW LA English DT Article ID EARTH RADIATION BUDGET; HORIZONTAL RESOLUTION; SYSTEMATIC-ERRORS; GENERAL-CIRCULATION; CLIMATE; ECMWF; PARAMETRIZATION AB The purpose of this paper is to discuss the major systematic errors of the U.S. Navy Operational Global Atmospheric Prediction System (NOGAPS), version 3.2, and to describe several tuning experiments of NOGAPS parameterizations. It is found that despite its overall good performance, major systematic errors exist in the forecast model. These errors lead to a war-mer atmosphere with less precipitation and eddy kinetic energy than is observed. Some of the errors may be attributed to the lack of horizontal and vertical resolution, but most of the errors are due to inadequacies and incorrect assumptions in the physical parameterizations. We present a list of the systematic errors of the operational 5-day forecasts and results of a 1-yr integration with climatological sea surface temperatures. One of the prominent features of NOGAPS integrations is a large diurnal oscillation in the global mean averages. This oscillation is traced to large differences in total albedo over the land and sea areas. We present results of 31-day integrations for December 1989, December 1990, and December 1991, where we varied the value of the single-scattering albedo, limited the vertical region of the gravity-wave drag, and varied the magnitude of the vertical mixing coefficient. In January 1992 a new version of the forecast model was implemented, which was designated as NOGAPS 3.3 and which incorporated changes to the cloud single-scattering albedo, the gravity-wave drag, and the vertical mixing parameterizations. We compare a 1-yr simulation of different versions of NOGAPS, and we show statistical results of forecasts using the two model versions. We believe that synoptically 3.3 is superior to 3.2, but the statistical skill, as measured by the anomaly correlation of the Northern Hemisphere's 500-mb height field, of the different versions is the same. RP HOGAN, TF (reprint author), NAVAL RES LAB,DIV MARINE METEOROL,MONTEREY,CA 93943, USA. NR 45 TC 67 Z9 67 U1 0 U2 3 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 AUG PY 1993 VL 121 IS 8 BP 2373 EP 2395 DI 10.1175/1520-0493(1993)121<2373:SSOTNG>2.0.CO;2 PG 23 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LP877 UT WOS:A1993LP87700013 ER PT J AU ALI, AI KENNINGTON, JL LIANG, TT AF ALI, AI KENNINGTON, JL LIANG, TT TI ASSIGNMENT WITH EN-ROUTE TRAINING OF NAVY PERSONNEL SO NAVAL RESEARCH LOGISTICS LA English DT Article ID ALGORITHMS AB Each year over 200000 Navy enlisted personnel are assigned new jobs at a cost of over 250 million dollars in moving expenses. The task of selecting assignments is complicated by the fact that an individual can be sent to a technical school (which has a limited capacity) to obtain additional training which makes him eligible for additional jobs. The optimal assignment of Navy personnel with en route training is addressed via an assignment problem with specially structured side constraints. This article presents a new algorithm to solve the integer network problem which is based on resource-directive decomposition in conjunction with Lagrangian relaxation. The new solution procedure is very fast compared to alternate methods. (C) 1993 John Wiley & Sons, Inc. C1 SO METHODIST UNIV,DALLAS,TX 75275. USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92132. RP ALI, AI (reprint author), UNIV MASSACHUSETTS,AMHERST,MA 01003, USA. NR 9 TC 11 Z9 11 U1 2 U2 3 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD AUG PY 1993 VL 40 IS 5 BP 581 EP 592 PG 12 WC Operations Research & Management Science SC Operations Research & Management Science GA LM305 UT WOS:A1993LM30500001 ER PT J AU VANDENNOUWELAND, A BORM, P OWEN, G TIJS, S AF VANDENNOUWELAND, A BORM, P OWEN, G TIJS, S TI COST ALLOCATION AND COMMUNICATION SO NAVAL RESEARCH LOGISTICS LA English DT Article ID GAMES AB This article considers a special class of cost allocation problems, where the communication possibilities among the agents are restricted. Integral formulas are derived for two allocation rules: the Myerson value and the position value. (C) 1993 John Wiley & Sons, Inc. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. RP VANDENNOUWELAND, A (reprint author), TILBURG UNIV,DEPT ECONOMETR,POB 90153,5000 LE TILBURG,NETHERLANDS. RI van den Nouweland, Anne/I-5038-2012 OI van den Nouweland, Anne/0000-0002-8057-2329 NR 7 TC 0 Z9 0 U1 0 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD AUG PY 1993 VL 40 IS 5 BP 733 EP 744 PG 12 WC Operations Research & Management Science SC Operations Research & Management Science GA LM305 UT WOS:A1993LM30500011 ER PT J AU JOHNSON, DL BRAUN, D BRUCE, DA FRIENDLY, D RAFFEL, C AF JOHNSON, DL BRAUN, D BRUCE, DA FRIENDLY, D RAFFEL, C TI ACCIDENTAL HEAD TRAUMA AND RETINAL HEMORRHAGE SO NEUROSURGERY LA English DT Article DE ACCIDENTS; CHILD ABUSE; HEAD INJURIES; RETINAL HEMORRHAGE; SUBDURAL HEMATOMA ID CARDIOPULMONARY RESUSCITATION; CHILD-ABUSE; SHAKING; INJURY; INFANT AB RETINAL HEMORRHAGE AND intracranial hemorrhage in a child with little external evidence of trauma and with a poorly documented history are considered pathognomonic child abuse. The mechanism and magnitude of force required to produce the injuries are seldom witnessed or known. This study was designed to determine the incidence of retinal hemorrhage in pediatric head injuries under known accidental circumstances, in association with forces sufficient to cause skull fracture and/or intracranial hemorrhage. Of 525 consecutive hospital admissions for head injuries, 200 children filled these criteria. Thirty children were excluded because of suspected child abuse or gunshot wounds. Of the remaining 170, 140 were evaluated by an ophthalmologist for retinal hemorrhage. Two children, who were both involved in side-impact car accidents, had retinal hemorrhages in associated with severe head injury. Retinal hemorrhage occurs rarely in accidental head injury and is associated with extraordinary force. C1 GEORGE WASHINGTON UNIV,CHILDRENS NATL MED CTR,SCH MED & HLTH SCI,DEPT PEDIAT,WASHINGTON,DC 20052. BALBOA NAVAL HOSP,DEPT NEUROSURG,SAN DIEGO,CA. GEORGE WASHINGTON UNIV,CHILDRENS NATL MED CTR,SCH MED & HLTH SCI,DEPT OPHTHAL,WASHINGTON,DC 20052. RP JOHNSON, DL (reprint author), PENN STATE UNIV,MILTON S HERSHEY MED CTR,CHILDRENS HOSP,MILTON S HERSHEY MED CTR,COLL MED,HERSHEY,PA 17033, USA. NR 45 TC 61 Z9 65 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0148-396X J9 NEUROSURGERY JI Neurosurgery PD AUG PY 1993 VL 33 IS 2 BP 231 EP 235 PG 5 WC Clinical Neurology; Surgery SC Neurosciences & Neurology; Surgery GA LP279 UT WOS:A1993LP27900008 PM 8367044 ER PT J AU ATHALE, RA YANG, XY SZU, H AF ATHALE, RA YANG, XY SZU, H TI OPTICAL IMPLEMENTATION OF WEBER-LAW NEURONS BASED ON THE DYNAMIC BEHAVIOR OF ELECTRON TRAPPING MATERIALS SO OPTICS COMMUNICATIONS LA English DT Article ID NEURAL NETWORKS; MEMORY AB A unique approach is presented to implement the neuron transfer function of Weber-law neurons by exploiting the dynamic behavior of electron trapping (ET) materials. The proposed scheme realizes the complex dynamic behavior of such neurons with a single ET thin film in a spatially continuous manner. Theoretical analyses are supported by preliminary experimental results. C1 QUANTEX CORP,ROCKVILLE,MD 20850. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP ATHALE, RA (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 20 TC 1 Z9 1 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 AUG 1 PY 1993 VL 101 IS 1-2 BP 10 EP 16 DI 10.1016/0030-4018(93)90314-U PG 7 WC Optics SC Optics GA LN447 UT WOS:A1993LN44700003 ER PT J AU GROSHENS, TJ HIGA, KT NISSAN, R BUTCHER, RJ FREYER, AJ AF GROSHENS, TJ HIGA, KT NISSAN, R BUTCHER, RJ FREYER, AJ TI DIETHYL(DI-TERT-BUTYLPHOSPHINO)BORANE AND RELATED-COMPOUNDS - THE 1ST STABLE MONOMERIC TETRAALKYL PHOSPHINOBORANE SO ORGANOMETALLICS LA English DT Article ID BORON-PHOSPHORUS; HYDROBORATION; PHOSPHIDE AB Four new phosphinoborane compounds were prepared and characterized by H-1, C-13, P-31, and B-11 NMR spectroscopy and elemental analysis. Monomeric Et2BP(t-Bu)2 Was isolated as a volatile yellow liquid and [Me2BP(t-Bu)2]2 as a colorless solid using salt elimination reactions. The colorless dimeric solids [Me2BP(SiMe3)2]2 and [Et2BP(SiMe3)2]2 were prepared via trimethylsilyl halide elimination reactions. The dimeric compounds dissociate in benzene or toluene at ambient temperature, and an equilibrium with the monomeric species is established. Variable-temperature H-1 NMR spectroscopy showed that DELTAH = -93 kJ/mol and DELTAS = -285 J/(mol.K) for the dimerization of Me2BP(t-Bu)2 and DELTAH = -55 +/- 12 kJ/mol and DELTAS = -166 +/- 42 J/(mol.K) for the dimerization of Me2BP(SiMe3)2. Inverse 2D H-1/C-13 correlation studies were applied to monomer-dimer solutions and were vital to assignment of C-13 resonances. Solid-state P-31 NMR confirmed that [Me2BP(t-BU)2]2 and [Me2BP(SiMe3)2]2 are dimeric solids. The structure of [Me2BP(t-BU)2]2 was determined by single-crystal X-ray diffraction. Crystal data: triclinic, space group P1BAR, a = 8.366(3) angstrom, b = 8.0808(2) angstrom, c = 9.311(2) angstrom, alpha = 74.98(2)-degrees, beta = 78.87(2)-degrees, gamma = 64.32(2)-degrees, Z = 1, and R = 0.0628. C1 HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059. SMITHKLINE BEECHAM PHARMACEUT,KING OF PRUSSIA,PA 19406. RP GROSHENS, TJ (reprint author), USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,DIV WEAP,CHINA LAKE,CA 93555, USA. NR 15 TC 14 Z9 14 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD AUG PY 1993 VL 12 IS 8 BP 2904 EP 2910 DI 10.1021/om00032a011 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA LU683 UT WOS:A1993LU68300011 ER PT J AU FOX, AG AF FOX, AG TI ELECTRON CHARGE-DISTRIBUTION OF CHROMIUM SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID ATOMIC SCATTERING FACTORS; DENSITY; COPPER AB A critical review of all the X-ray crystal structure factors of chromium has been performed. This showed that the low-angle X-ray atomic scattering (form) factors have been most accurately measured by electron diffraction and that, with correct choice of Debye temperature and analysis procedure, these are in excellent agreement with the best theoretical calculations. These accurate form factors were found to be considerably less than those obtained from free atom calculations and the implications of these differences for bonding in chromium was investigated by generating a (110) deformation electron density distribution. This showed that bonding in chromium is achieved by the close-to-spherical depletion of electrons from atomic sites with redistribution such that there is a build-up of electrons in [100] and [110] between second and third nearest neighbour atoms with apparently very little charge density between nearest neighbour atoms in [111]. These observations are consistent with the fact that the directional component of bonding in chromium is dominated by the 3d electrons which can arrange themselves so that the Cr atoms achieve closer packing in the b.c.c. structure than if they were spherical. RP FOX, AG (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI SECT,MONTEREY,CA 93943, USA. NR 32 TC 0 Z9 0 U1 1 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD AUG PY 1993 VL 68 IS 2 BP 275 EP 283 DI 10.1080/01418639308226406 PG 9 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA LT075 UT WOS:A1993LT07500010 ER PT J AU KHAZENIE, N RICHARDSON, KA AF KHAZENIE, N RICHARDSON, KA TI DETECTION OF OIL FIRE SMOKE OVER WATER IN THE PERSIAN-GULF REGION SO PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING LA English DT Article; Proceedings Paper CT 9TH THEMATIC CONF ON GEOLOGIC REMOTE SENSING CY FEB 08-11, 1993 CL PASADENA, CA ID KUWAIT AB Smoke from the recent Kuwait oil fires and the regional dust storms, collectively referred to as aerosol features, attracted enormous attention among a wide variety of scientists and environmentalists. Yet many real-time interpreters of NOAA Advanced Very High Resolution Radiometer (AVHRR) images have difficulties in consistently detecting and distinguishing these features. To identify aerosol features, automated statistical and non-statistical texture measures have been investigated. The appropriate measures were extended and successfully applied to this problem. The difficulty in detecting aerosol features arises from two different phenomena. First, aerosol features such as dust, smoke, and fog have very similar signatures in the spectral dimension of AVHRR data. Second, these features vary widely in spectral signature over water versus land, during daytime versus night, and during summer versus winter. The newly developed algorithms take these highly dynamic parameters into account. Texture measures under study include (1) co-occurrence matrix, (2) normalized difference histogram, and (3) two-dimensional (2D) Gabor functions. All of these texture measures are highly parametrized. An extensive sensitivity analysis was performed in order to select the optimum parameter set. For final testing, a statistical unsupervised clustering algorithm was selected for comparison. Preliminary results have been encouraging. A summary of the results is presented. C1 UNIV CORP ATMOSPHER RES,BOULDER,CO 80301. USN,RES LAB,MONTEREY,CA 93943. NR 15 TC 6 Z9 6 U1 0 U2 1 PU AMER SOC PHOTOGRAMMETRY PI BETHESDA PA 5410 GROSVENOR LANE SUITE 210, BETHESDA, MD 20814-2160 SN 0099-1112 J9 PHOTOGRAMM ENG REM S JI Photogramm. Eng. Remote Sens. PD AUG PY 1993 VL 59 IS 8 BP 1271 EP 1276 PG 6 WC Geography, Physical; Geosciences, Multidisciplinary; Remote Sensing; Imaging Science & Photographic Technology SC Physical Geography; Geology; Remote Sensing; Imaging Science & Photographic Technology GA LX366 UT WOS:A1993LX36600007 ER PT J AU SINGH, DJ AF SINGH, DJ TI ELECTRONIC-STRUCTURE OF HGBA2CA2CU3O8 - THE ROLE OF MERCURY SO PHYSICAL REVIEW B LA English DT Note ID BRILLOUIN-ZONE; BAND PROPERTIES; SPECIAL POINTS AB Local-density-approximation calculations are used to elucidate the electronic structure of HgBa2Ca2Cu3O8. Unlike the case in the corresponding single-CuO2-layer material, there is a Hg-derived band that dips below the Fermi energy, and this hole dopes the cuprate planes. This difference is related to apparent electronegativity differences of one-, two-, and three-layer stacks of CuO2 planes. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RI Singh, David/I-2416-2012 NR 20 TC 28 Z9 28 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 AUG 1 PY 1993 VL 48 IS 5 BP 3571 EP 3574 DI 10.1103/PhysRevB.48.3571 PG 4 WC Physics, Condensed Matter SC Physics GA LQ989 UT WOS:A1993LQ98900098 ER PT J AU IDZERDA, YU TJENG, LH LIN, HJ GUTIERREZ, CJ MEIGS, G CHEN, CT AF IDZERDA, YU TJENG, LH LIN, HJ GUTIERREZ, CJ MEIGS, G CHEN, CT TI MAGNETIC-STRUCTURE OF FE/CR/FE TRILAYERS SO PHYSICAL REVIEW B LA English DT Note ID X-RAY DICHROISM; FE LAYERS; ELECTRONIC-STRUCTURE; INTERLAYER EXCHANGE; CIRCULAR-DICHROISM; CR; MAGNETORESISTANCE; SUPERLATTICES; MULTILAYERS; SPECTRUM AB Soft x-ray magnetic circular dichroism (SXMCD) is used to determine independently the magnetic behavior of each layer of Fe/Cr/Fe trilayers deposited on GaAs(001). Submonolayer coverages of Cr on Fe(001) films are found to be ferromagnetic and antialigned to the Fe moment. Subsequent Cr deposition shows a monotonically decreasing total moment, consistent with island growth of ferromagnetic Cr sheets antialigned with adjoining Cr layers. For thin Cr interlayers, the second Fe film is antialigned with the first Fe film, but a second Fe film of less than 2-ML thickness shows no SXMCD signal. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. SW TEXAS STATE UNIV,DEPT PHYS,SAN MARCOS,TX 78666. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 39 TC 79 Z9 80 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 AUG 1 PY 1993 VL 48 IS 6 BP 4144 EP 4147 DI 10.1103/PhysRevB.48.4144 PG 4 WC Physics, Condensed Matter SC Physics GA LT229 UT WOS:A1993LT22900068 ER PT J AU TRIANDAF, I SCHWARTZ, IB AF TRIANDAF, I SCHWARTZ, IB TI STOCHASTIC TRACKING IN NONLINEAR DYNAMICAL-SYSTEMS SO PHYSICAL REVIEW E LA English DT Article ID ATTRACTORS; CHAOS AB In a previous paper [Phys. Rev. A 46, 7439 (1992)] we have introduced an alternative continuation method which does not require an analytical model, but only an experimental time series. Using a predictor-corrector technique, the method tracks a given unstable orbit through different bifurcation regimes by varying an accessible system parameter. In this method, the continuation parameter was varied deterministically. That is, the location of the parameter is chosen by the experimenter. In this paper we introduce a similar algorithm, but now the parameter is varied randomly. A correction procedure is introduced so that control of an unstable orbit is not lost as the parameter changes. Moreover, we show that the small-amplitude feedback-control technique used for correction allows large-amplitude bursts in the parameter. These features are useful to experimentalists for canceling drift in experiments, which is inevitable at some level. RP TRIANDAF, I (reprint author), USN,RES LAB,DIV PLASMA PHYS,CODE 67003,WASHINGTON,DC 20375, USA. RI Schwartz, Ira/A-8073-2009 NR 12 TC 24 Z9 24 U1 1 U2 3 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 AUG PY 1993 VL 48 IS 2 BP 718 EP 722 DI 10.1103/PhysRevE.48.718 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300018 ER PT J AU SZU, HH YANG, XY TELFER, BA SHENG, YL AF SZU, HH YANG, XY TELFER, BA SHENG, YL TI NEURAL-NETWORK AND WAVELET TRANSFORM FOR SCALE-INVARIANT DATA CLASSIFICATION SO PHYSICAL REVIEW E LA English DT Article ID TURBULENCE AB Given an astrophysical observation with an arbitrary carrier frequency and an unknown scale under an additive white noise, s'(t)=-s(at)+n (t), its wavelet transform is W'(a,b) - (s'(t),h(ab)(t)), as computed by the inner product with a daughter wavelet h(ab)(t)=h((t -b)/a)/a. W'(a b) equals the original transform W(a,b)=(s(t),h(ab)(t)) displaced along the radial direction W'(a,b)=W(aa,ab) plus noise in the time-scale joint-representation plane. A bank of wedge-shaped detectors collects those displaced transforms W'(a,b) to create a set of invariant features. These features are fed into a two-layer feed-forward artificial neural network, to interpolate discrete sampling, as demonstrated successfully for real-time-signal automatic classification. Useful wavelet applications in turbulence onset, spectrum analyses, fractal aggregates, and bubble-chamber particle-track pattern-recognition problems are indicated but are modeled, in the interest of simplicity, in a one-dimensional example. C1 QUANTEX CORP,ROCKVILLE,MD 20805. UNIV LAVAL,DEPT PHYS,ST FOY G1K 7P4,PQ,CANADA. RP SZU, HH (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,CODE R44,SILVER SPRING,MD 20903, USA. NR 13 TC 30 Z9 34 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 AUG PY 1993 VL 48 IS 2 BP 1497 EP 1501 DI 10.1103/PhysRevE.48.1497 PG 5 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA LV383 UT WOS:A1993LV38300107 ER PT J AU COCHRAN, FL ROBSON, AE AF COCHRAN, FL ROBSON, AE TI VISCORESISTIVE STABILIZATION OF THE Z PINCH SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RESISTIVE Z-PINCH; DEUTERIUM-FIBER; STABILITY AB A two-dimensional magnetohydrodynamic code that includes resistivity and viscosity has been used to study the growth of m = 0 perturbations of a Z pinch in which the current increases with time. Stability for all wave numbers was found when the product SR was less than about 1000, where S is the Lundquist number and R is the Alfven-Reynolds number. Since SR depends only on the line density N, the stability criterion translates as N < 2 X 10(16) ions cm-1 (deuterium). This is two to three orders of magnitude smaller than the line density of fiber pinch experiments that have shown anomalous stability, and it is concluded that viscoresistive effects are inadequate to account for these observations. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP COCHRAN, FL (reprint author), BERKELEY RES ASSOCIATES INC,POB 852,SPRINGFIELD,VA 22150, USA. NR 20 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 2905 EP 2908 DI 10.1063/1.860678 PG 4 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200020 ER PT J AU HAFIZI, B GOLD, SH MANHEIMER, WM SPRANGLE, P AF HAFIZI, B GOLD, SH MANHEIMER, WM SPRANGLE, P TI NONLINEAR-ANALYSIS OF A MAGNICON OUTPUT CAVITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GYROTRONS AB A nonlinear analysis of the wave-particle interaction in the output cavity of a frequency-doubling magnicon amplifier is presented. The cavity is immersed in an axial magnetic field, wherein electrons interact with a rotating TM210 mode via a gyroresonant mechanism. The electron equations of motion and the wave equation for the radio-frequency (rf) field are derived and expressed in terms of scaled variables in order to study the general scaling of the output cavity. Single-electron, time-dependent simulation of the interaction in the cavity is performed to assess the accessibility and stability of high-efficiency states for an X-band magnicon. Results from multielectron, steady-state simulation are presented to show the effect of spreads in electron-beam radius, energy, and transverse momentum on the efficiency. C1 USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. USN,RES LAB,DIV PLASMA PHYS,CODE 6707,WASHINGTON,DC 20375. RP HAFIZI, B (reprint author), ICARUS RES,7113 EXFAIR RD,BETHESDA,MD 20814, USA. NR 12 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 3045 EP 3055 DI 10.1063/1.860691 PG 11 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200034 ER PT J AU UHM, HS AF UHM, HS TI A THEORY OF THE 2-BEAM KLYSTRON SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RELATIVISTIC ELECTRON-BEAMS; GENERATION; POWER AB A theoretical model is developed for the two-beam klystron, where two concentric annular electron beams propagate through a grounded conducting tube. The beams premodulated at the first cavity enter the second cavity, exciting it. The induced voltage at the second cavity returns a part of the inner beam toward the first cavity, establishing a mutual communication between two cavities. The in-phase condition of the return current is obtained in terms of the intercavity distance. The maximum current-modulation condition at the second cavity is also obtained. These two conditions determine an optimum intercavity distance. The oscillation behavior of the first cavity is investigated, including influence of the intercavity distance on the induced pp voltage appearing on the cavity opening. The relationship between the induced voltage and the modulated return current in the opening is found from an equivalent circuit representation of the cavity impedance. The boundary between the oscillator and amplifier regions is described in the parameter space defined by the normalized return-current strength h and intercavity distance represented by the phase angle alpha. In the amplifier region (h sin alpha < 1), the amplification occurs only for a narrow range of the phase angle alpha. The induced voltage grows exponentially in the oscillator region satisfying h sin alpha > 1. Introducing a nonlinear saturation term into the return current, the induced voltage is bounded in the oscillator operation. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1993 VL 5 IS 8 BP 3056 EP 3068 DI 10.1063/1.860638 PG 13 WC Physics, Fluids & Plasmas SC Physics GA LR032 UT WOS:A1993LR03200035 ER PT J AU JOHNSON, WB WILSON, K AF JOHNSON, WB WILSON, K TI THE MILITARY INTERNSHIP - A RETROSPECTIVE ANALYSIS SO PROFESSIONAL PSYCHOLOGY-RESEARCH AND PRACTICE LA English DT Article ID PROFESSIONAL PSYCHOLOGY; ISSUES; IMPAIRMENT; SELECTION; DISTRESS; STUDENTS; PROGRAMS AB American Psychological Association-accredited predoctoral internships have been a long tradition in several military medical centers. A review of the training literature revealed little information pertaining explicitly to military internships. It is suggested that this paucity of information is one of the reasons for the mystery and misconception often associated with these sites. This article explains the process of selection and military indoctrination, the strengths and stressors common in military settings, the intern experience in time of war, unique supervisory and ethical issues, and the implications of failing a military internship. The authors provide a description of their experience as interns at Bethesda Naval Hospital. This article is intended to assist students and advisors in careful consideration of military internships. C1 ORLANDO NAVAL HOSP,DEPT MENTAL HLTH,ORLANDO,FL. RP JOHNSON, WB (reprint author), USN,MED CLIN,DEPT MENTAL HLTH,BOX 121,HONOLULU,HI 96860, USA. NR 36 TC 11 Z9 11 U1 1 U2 1 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0735-7028 J9 PROF PSYCHOL-RES PR JI Prof. Psychol.-Res. Pract. PD AUG PY 1993 VL 24 IS 3 BP 312 EP 318 DI 10.1037/0735-7028.24.3.312 PG 7 WC Psychology, Multidisciplinary SC Psychology GA LP073 UT WOS:A1993LP07300013 ER PT J AU CALLAHAN, JH SOMOGYI, A WYSOCKI, VH AF CALLAHAN, JH SOMOGYI, A WYSOCKI, VH TI COLLISIONS OF C-60(+.) AND C-60(2+) AT FLUORINATED AND NON-FLUORINATED SELF-ASSEMBLED MONOLAYER FILMS SO RAPID COMMUNICATIONS IN MASS SPECTROMETRY LA English DT Article ID SURFACE-INDUCED DISSOCIATION; TRANSFORM MASS-SPECTROMETRY; POLYATOMIC IONS; STRUCTURAL CHARACTERIZATION; PROTONATED PEPTIDES; ORGANIC MONOLAYERS; ENERGY COLLISIONS; THIOL MONOLAYERS; GOLD ELECTRODES; SOLID-SURFACES AB We report here the spectra that result when singly and doubly charged buckminsterfullerene ions, C60+. and C602+, collide with self-assembled monolayer films at collison energies ranging from 125 to 320 eV. The surfaces were prepared by the spontaneous assembly of octadecanethiol (CH3(CH2)17SH), perdeuteroeicosanethiol (CD3(CD2)19SH), and 2-(perfluorooctyl)-ethanethiol (CF3(CF2)7CH2CH2SH) on vapor-deposited gold. The fluorinated surface causes the greatest conversion of kinetic energy into internal energy; more extensive fragmentation of doubly charged buckminsterfullerene C602+ is detected in collisions with this surface than in collisions with the alkanethiolate surfaces. C1 VIRGINIA COMMONWEALTH UNIV, DEPT CHEM, RICHMOND, VA 23284 USA. USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 77 TC 36 Z9 36 U1 0 U2 1 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0951-4198 EI 1097-0231 J9 RAPID COMMUN MASS SP JI Rapid Commun. Mass Spectrom. PD AUG PY 1993 VL 7 IS 8 BP 693 EP 699 DI 10.1002/rcm.1290070802 PG 7 WC Biochemical Research Methods; Chemistry, Analytical; Spectroscopy SC Biochemistry & Molecular Biology; Chemistry; Spectroscopy GA LT073 UT WOS:A1993LT07300001 ER PT J AU KALMYKOV, AI VELICHKO, SA TSYMBAL, VN KULESHOV, YA WEINMAN, JA JURKEVICH, I AF KALMYKOV, AI VELICHKO, SA TSYMBAL, VN KULESHOV, YA WEINMAN, JA JURKEVICH, I TI OBSERVATIONS OF THE MARINE-ENVIRONMENT FROM SPACEBORNE SIDE-LOOKING REAL APERTURE RADARS SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID SENSOR MICROWAVE IMAGER; KOSMOS-1500 SATELLITE; SURFACE WINDS; SEA ICE; WAVES; OCEAN; PROGRAM AB Real aperture, side looking X-band radars have been operated from the Soviet Cosmos-1500, -1602, -1766 and Ocean satellites since 1984. These radar systems observe a 475 km wide swath with 1-2 km horizontal spatial resolution. Wind velocities were inferred from sea surface radar scattering for speeds ranging from approximately 2 m/s to those of hurricane proportions. The wind speeds were within 10-20% of the measured in situ values, and the direction of the wind velocity inferred from the radar measurements agreed with in situ direction measurements within 20-50-degrees. Various atmospheric mesoscale eddies and tropical cyclones were thus located, and their strengths were inferred from sea surface reflectivity measurements. Rain cells were observed over both land and sea with these spaceborne radars. Algorithms to retrieve rainfall rates from spaceborne radar measurements were also developed. Spaceborne radars have been used to monitor various marine hazards. For example, information derived from those radars was used to plan rescue operations of distressed ships trapped in sea ice. Icebergs have also been monitored. Because oil films reduce the sea surface roughness and thereby alter the radar reflectivity, oil spills were also mapped. Tsunamis produced by underwater earthquakes were also observed from space by the radars on the Cosmos-1500 series of satellites. The Cosmos-1500 satellite series have provided all weather radar imagery of the earth's surface to a user community in, real time by means of a 137.4 MHz Automatic Picture Transmission (APT) channel. This feature enabled the radar information to be used in direct support of Soviet polar maritime activities. C1 NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP UKRAINIAN ACAD SCI, INST RADIOPHYS & ELECTR, KHARKOV, UKRAINE. NR 54 TC 2 Z9 2 U1 0 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0034-4257 EI 1879-0704 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD AUG PY 1993 VL 45 IS 2 BP 193 EP 208 DI 10.1016/0034-4257(93)90042-V PG 16 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA LM850 UT WOS:A1993LM85000007 ER PT J AU REPACE, JL LOWREY, AH AF REPACE, JL LOWREY, AH TI AN ENFORCEABLE INDOOR AIR-QUALITY STANDARD FOR ENVIRONMENTAL TOBACCO-SMOKE IN THE WORKPLACE SO RISK ANALYSIS LA English DT Article DE ENVIRONMENTAL TOBACCO SMOKE; INDOOR AIR QUALITY STANDARD; NICOTINE; COTININE; PHARMACOKINETIC MODELING; RISK ASSESSMENT ID LUNG-CANCER RISK; PASSIVE SMOKING; SERUM COTININE; 7TH-DAY ADVENTISTS; NONSMOKING WOMEN; EXPOSURE; NICOTINE; MORTALITY; DISEASE; MARKERS AB Environmental tobacco smoke (ETS) has recently been determined by U.S. environmental and occupational health authorities to be a human carcinogen. We develop a model which permits using atmospheric nicotine measurements to estimate nonsmokers' ETS lung cancer risks in individual workplaces for the first time. We estimate that during the 1980s, the U.S. nonsmoking adult population's median nicotine lung exposure (homes and workplaces combined) was 143 micrograms (mug) of nicotine daily, and that most-exposed adult nonsmokers inhaled 1430 mg/day. These exposure estimates are validated by pharmacokinetic modeling which yields the corresponding steady-state dose of the nicotine metabolite, cotinine. For U.S. adult nonsmokers of working age, we estimate median cotinine values of about 1.0 nanogram per milliliter (ng/ml) in plasma, and 6.2 ng/ml in urine; for most-exposed nonsmokers, we estimate cotinine concentrations of about 10 ng/ml in plasma and 62 ng/ml in urine. These values are consistent to within 15% of the cotinine values observed in contemporaneous clinical epidemiological studies. Corresponding median risk from ETS exposure in U.S. nonsmokers during the 1980s is estimated at about two lung cancer deaths (LCDs) per 1000 at risk, and for most-exposed nonsmokers, about two LCDs per 100. Risks abroad appear similar. Modeling of the lung cancer mortality risk from passive smoking suggests that de minimis [i.e., ''acceptable'' (10(-6)], risk occurs at an 8-hr time-weighted-average exposure concentration of 7.5 nanograms of ETS nicotine per cubic meter of workplace air for a working lifetime of 40 years. This model is based upon a linear exposure-response relationship validated by physical, clinical, and epidemiological data. From available data, it appears that workplaces without effective smoking policies considerably exceed this de minimis risk standard. For a substantial fraction of the 59 million nonsmoking workers in the U.S., current workplace exposure to ETS also appears to pose risks exceeding the de manifestis risk level above which carcinogens are strictly regulated by the federal government. C1 USN,RES LAB,WASHINGTON,DC 20375. RP REPACE, JL (reprint author), US EPA,WASHINGTON,DC 20460, USA. NR 70 TC 76 Z9 80 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD AUG PY 1993 VL 13 IS 4 BP 463 EP 475 DI 10.1111/j.1539-6924.1993.tb00747.x PG 13 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA LX892 UT WOS:A1993LX89200012 PM 8234955 ER PT J AU DITTO, WL PECORA, LM AF DITTO, WL PECORA, LM TI MASTERING CHAOS SO SCIENTIFIC AMERICAN LA English DT Article C1 USN,RES LAB,PROGRAM NONLINEAR DYNAM,WASHINGTON,DC 20375. RP DITTO, WL (reprint author), GEORGIA INST TECHNOL,ATLANTA,GA 30332, USA. NR 5 TC 73 Z9 73 U1 0 U2 1 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 SN 0036-8733 J9 SCI AM JI Sci.Am. PD AUG PY 1993 VL 269 IS 2 BP 78 EP 84 PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM920 UT WOS:A1993LM92000012 ER PT J AU NEFF, J CARROLL, TL AF NEFF, J CARROLL, TL TI CIRCUITS THAT GET CHAOS IN SYNC SO SCIENTIFIC AMERICAN LA English DT Article C1 COLL WOOSTER,WOOSTER,OH 44691. USN,RES LAB,WASHINGTON,DC 20375. RP NEFF, J (reprint author), GEORGIA INST TECHNOL,ATLANTA,GA 30332, USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 SN 0036-8733 J9 SCI AM JI Sci.Am. PD AUG PY 1993 VL 269 IS 2 BP 120 EP 122 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM920 UT WOS:A1993LM92000017 ER PT J AU TILTON, T AF TILTON, T TI SHIP MODELS SO SMITHSONIAN LA English DT Letter RP TILTON, T (reprint author), USN,SAN DIEGO,CA 92132, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SMITHSONIAN ASSOCIATES PI WASHINGTON PA 900 JEFFERSON DRIVE, WASHINGTON, DC 20560 SN 0037-7333 J9 SMITHSONIAN JI Smithsonian PD AUG PY 1993 VL 24 IS 5 BP 10 EP 10 PG 1 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA LQ392 UT WOS:A1993LQ39200018 ER PT J AU QUONG, AA PEDERSON, MR FELDMAN, JL AF QUONG, AA PEDERSON, MR FELDMAN, JL TI 1ST PRINCIPLES DETERMINATION OF THE INTERATOMIC FORCE-CONSTANT TENSOR OF THE FULLERENE MOLECULE SO SOLID STATE COMMUNICATIONS LA English DT Article ID INELASTIC NEUTRON-SCATTERING; LOCAL-DENSITY-APPROXIMATION; VIBRATIONAL-MODES; C-60; C60; SIMULATIONS; BUCKMINSTERFULLERENE; POLARIZABILITIES; SPECTROSCOPY; SPECTRUM AB We have determined the full force constant tensor (Hessian) of the fullerene molecule, C60 from first principles. From our all-electron density functional code, the forces on all of the atoms are calculated for different displacements of a single atom. Using finite differences and the symmetry operations of the molecule, the full matrix is determined. Diagonalization of the dynamical matrix yields the vibrational modes, which are in excellent agreement with experiment, The range and nature of the force constant tensor will be presented. RP USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. NR 31 TC 95 Z9 95 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 EI 1879-2766 J9 SOLID STATE COMMUN JI Solid State Commun. PD AUG PY 1993 VL 87 IS 6 BP 535 EP 539 DI 10.1016/0038-1098(93)90591-A PG 5 WC Physics, Condensed Matter SC Physics GA LU135 UT WOS:A1993LU13500009 ER PT J AU METZBOWER, EA AF METZBOWER, EA TI PENETRATION DEPTH IN LASER-BEAM WELDING SO WELDING JOURNAL LA English DT Article DE PENETRATION DEPTH; LASER BEAM WELDING; FACTORIAL EXPERIMENT; INDEPENDENT VARIABLE; REGRESSION ANALYSIS; DIMENSIONAL ANALYSIS; MULTIVARIABLE ANALYSIS; THERMOPHYSICAL DATA; DATA BASE DEVELOPMENT; CALC VS EXP VALUE AB The depth of penetration in laser beam welding of steels has been determined by two different techniques. A 23 factorial experiment was used to calculate the depth of penetration as a function of laser power, welding speed, and focal distance. Using Yates's algorithm, the main effects, the two-factor and three-factor interactions, were determined. A generalized multivariable least squares analysis of the data resulted in an equation that expressed the depth of penetration as a function of power, speed, focal distance and all combinations of the those variables. A dimensional analysis of laser beam welding resulted in a functional relationship that expressed the depth of welding as a function of laser power, welding speed, beam diameter and thermal properties of the steel. Both of these techniques were then used to compare the calculations with sets of experimental data. RP METZBOWER, EA (reprint author), USN,RES LAB,WASHINGTON,DC 20350, USA. NR 8 TC 3 Z9 3 U1 2 U2 4 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD AUG PY 1993 VL 72 IS 8 BP S403 EP S407 PG 5 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA LQ246 UT WOS:A1993LQ24600023 ER PT J AU CAMPBELL, ML MCCLEAN, RE AF CAMPBELL, ML MCCLEAN, RE TI KINETICS OF NEUTRAL TRANSITION-METAL ATOMS IN THE GAS-PHASE - OXIDATION REACTIONS OF TI(A(3)F) FROM 300-K TO 600-K SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-AFFINITIES; TEMPERATURE-DEPENDENCE; N2O; STATE; COMPLEXES; AL+CO2; O-2; CO2; SCO; NO AB Gas-phase kinetics are reported for the reactions of Ti(a3F) with O2, N2O, NO, CO2, SO2, and NO2 from 300 to 600 K. Titanium atoms were produced by the photolysis of TiCl4 at 248 nm and were detected by laser-induced fluorescence. Arrhenius expressions obtained for these reactions at a buffer gas pressure of 20 Torr are k(O2) = (1.69 +/- 0.41) x 10(-10) exp(-(11.6 +/- 0.8 kJ/mol)/RT) cm3 s-1, k(N2O) = (1.74 +/- 0.44) X 10(-10) exp(-(14.3 +/- 0.9 kJ/mol)/RT cm3 s-1, k(NO) = 3.28 +/- 0.69) x 10(-11) exp(-(3.62 +/- 0.71 kJ/mol)/RT) cm3 s-1, k(CO2) = (7.0 +/- 1.6) x 10(-11) exp(-(14.9 +/- 0.8 kJ/mol)/RT) cm3 s-1, and k(SO2) = (1.70 +/- 0.33) X 10(-10) exp(-(2.66 +/- 0.64 kJ/mol)/RT) cm3 s-1. The rate constant of Ti with NO2 was found to be temperature independent from 300 to 500 K with a value of (9 +/- 4) x 10(-11) cm3 s-1. Quoted uncertainities are +/- 2sigma. With the exception of Ti + O2, all reactions were investigated as a function of pressure. Only the reactions of Ti with NO and CO2 were found to depend on the argon buffer gas pressure. Termolecular rate constants at 300 K were determined to be (5.8 +/- 2.6) x 10(-31) cm6 s-1 and (3.5 +/- 1.0) X 10(-32) cm6 s-1 for NO and CO2, respectively. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP CAMPBELL, ML (reprint author), USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402, USA. NR 26 TC 65 Z9 66 U1 0 U2 1 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 JUL 29 PY 1993 VL 97 IS 30 BP 7942 EP 7946 DI 10.1021/j100132a024 PG 5 WC Chemistry, Physical SC Chemistry GA LW330 UT WOS:A1993LW33000024 ER PT J AU QI, J YEGANEH, MS KOLTOVER, I YODH, AG THEIS, WM AF QI, J YEGANEH, MS KOLTOVER, I YODH, AG THEIS, WM TI DEPLETION-ELECTRIC-FIELD-INDUCED CHANGES IN 2ND-HARMONIC GENERATION FROM GAAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SEMICONDUCTOR SURFACES AB Experiments reveal that the near surface second-order nonlinear optical susceptibility, chi(2)(2omega,omega,omega), is significantly affected by band-bending induced-electric fields in the depletion region of GaAs(001). Both n- and p-type GaAs samples exhibit a reduction of the bulk second-order susceptibility chi(yxz)(2) independent of electric field direction. A three band theoretical model was used to qualitatively explain these observations. C1 USN,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555. RP QI, J (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. NR 21 TC 55 Z9 56 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 26 PY 1993 VL 71 IS 4 BP 633 EP 636 DI 10.1103/PhysRevLett.71.633 PG 4 WC Physics, Multidisciplinary SC Physics GA LP045 UT WOS:A1993LP04500041 ER PT J AU RONEN, B TRIETSCH, D AF RONEN, B TRIETSCH, D TI OPTIMAL SCHEDULING OF PURCHASING ORDERS FOR LARGE PROJECTS SO EUROPEAN JOURNAL OF OPERATIONAL RESEARCH LA English DT Article DE PROJECT MANAGEMENT; PERT; PURCHASING; NEWSBOY PROBLEM; LEAD TIME; BPERT AB In this paper we generalize the newsboy model to optimize the scheduling of purchasing orders for large projects. The timely completion of a typical project hinges upon receiving all the purchased components by the time they are scheduled to be used. We show how to minimize the total expected cost of the project, including lateness penalty cost and holding costs. The main contribution of the paper is in solving the problem for more than one component while considering the interdependencies that exist among them. We outline an analytic solution and present fast heuristics. C1 USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943. RP RONEN, B (reprint author), TEL AVIV UNIV,FAC MANAGEMENT,IL-69978 TEL AVIV,ISRAEL. NR 6 TC 1 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-2217 J9 EUR J OPER RES JI Eur. J. Oper. Res. PD JUL 23 PY 1993 VL 68 IS 2 BP 185 EP 195 DI 10.1016/0377-2217(93)90302-4 PG 11 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA LL788 UT WOS:A1993LL78800004 ER PT J AU BASHKANSKY, M REINTJES, J AF BASHKANSKY, M REINTJES, J TI NONLINEAR-OPTICAL FIELD CROSS-CORRELATION TECHNIQUES FOR MEDICAL IMAGING WITH LASERS SO APPLIED OPTICS LA English DT Article ID STIMULATED RAMAN AMPLIFICATION AB We show that certain resonant nonlinear-optical processes are capable of producing a cross-correlation function of the incident fields. This property can be used for time-gating purposes. Using a coherent anti-Stokes Raman scattering process as a time gate, we reproduce an image of an object obscured by a scattering medium. RP BASHKANSKY, M (reprint author), USN, RES LAB, DIV OPT SCI, LASER PHYS BRANCH, CODE 5640, WASHINGTON, DC 20375 USA. NR 17 TC 3 Z9 3 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 JUL 20 PY 1993 VL 32 IS 21 BP 3842 EP 3845 PG 4 WC Optics SC Optics GA LN837 UT WOS:A1993LN83700006 PM 20830015 ER PT J AU GUGGENHEIMER, SC BOYER, JH THANGARAJ, K SHAH, M SOONG, ML PAVLOPOULOS, TG AF GUGGENHEIMER, SC BOYER, JH THANGARAJ, K SHAH, M SOONG, ML PAVLOPOULOS, TG TI EFFICIENT LASER ACTION FROM 2 CW LASER-PUMPED PYRROMETHENE-BF(2) COMPLEXES SO APPLIED OPTICS LA English DT Note AB Two new pyrromethene-BF2 dyes, P-556 and P-567, are tested for cw laser operation. P-556 demonstrates a significant advance in the 530-620-nm region over commercially currently available dyes, where the best cw dyes in any range have peak efficiencies of the order of 35% and dyes in this range typically have less then 25%. The P-556 has a cw efficiency of 45% at the peak. C1 USN COMMAND, CTR CONTROL & OCEAN SURVEILLANCE, SAN DIEGO, CA 92152 USA. UNIV NEW ORLEANS, DEPT CHEM, NEW ORLEANS, LA 70148 USA. RP GUGGENHEIMER, SC (reprint author), SPECTRA PHYS LASERS, APPLICAT LAB, MT VIEW, CA 94042 USA. NR 5 TC 66 Z9 66 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 JUL 20 PY 1993 VL 32 IS 21 BP 3942 EP 3943 PG 2 WC Optics SC Optics GA LN837 UT WOS:A1993LN83700021 PM 20830030 ER PT J AU CATELLA, GC SHIOZAWA, LR HIETANEN, JR ECKARDT, RC ROUTE, RK FEIGELSON, RS COOPER, DG MARQUARDT, CL AF CATELLA, GC SHIOZAWA, LR HIETANEN, JR ECKARDT, RC ROUTE, RK FEIGELSON, RS COOPER, DG MARQUARDT, CL TI MID-IR ABSORPTION IN AGGASE2 OPTICAL PARAMETRIC OSCILLATOR CRYSTALS SO APPLIED OPTICS LA English DT Note DE SILVER GALLIUM SELENIDE (AGGASE2); OPTICAL ABSORPTION; OPTICAL PARAMETRIC OSCILLATOR (OPO) AB We report new experimental results on the spectral, thermal, and orientational characteristics of stoichiometry-dependent mid-IR absorption in AgGaSe2 crystals. In currently available material, this absorption poses an obstacle to the power scaling of the 2-mum-pumped AgGaSe2 optical parametric oscillator (OPO). Preliminary experiments have indicated that this absorption could be substantially reduced by optimization of the process parameters during crystal growth and annealing. OPO output powers approaching 10 W may be achievable by using optimized material. C1 STANFORD UNIV, STANFORD, CA 94305 USA. JAYCOR, VIENNA, VA 22180 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP CATELLA, GC (reprint author), CLEVELAND CRYSTALS INC, CLEVELAND, OH 44110 USA. NR 11 TC 31 Z9 31 U1 1 U2 5 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 JUL 20 PY 1993 VL 32 IS 21 BP 3948 EP 3951 PG 4 WC Optics SC Optics GA LN837 UT WOS:A1993LN83700023 PM 20830032 ER PT J AU HOOPER, WP AF HOOPER, WP TI AUREOLE LIDAR - INSTRUMENT DESIGN, DATA-ANALYSIS, AND COMPARISON WITH AIRCRAFT SPECTROMETER MEASUREMENTS SO APPLIED OPTICS LA English DT Article ID EXTINCTION; LIGHT AB A lidar system is developed to map extinction under the flight path of a P-3 aircraft. With a modified Cassegrainian telescope, signals from both wide and narrow fields of view are detected. The wide field-of-view detector senses the aureole signal generated by sea surface reflection and aerosol forward scattering. The narrow field-of-view detector senses the backscattering profile and the direct reflection off the sea surface. Optical depth and extinction profiles are derived from these signals. In comparisons made between in situ aerosol-size spectrometer and lidar measurements, lidar profiles are smaller in magnitude but similar in shape to the spectrometer profiles. RP HOOPER, WP (reprint author), USN, RES LAB, DIV REMOTE SENSING, CODE 7228, 4555 OVERLOOK AVE, WASHINGTON, DC 20375 USA. NR 11 TC 1 Z9 1 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 JUL 20 PY 1993 VL 32 IS 21 BP 4019 EP 4027 PG 9 WC Optics SC Optics GA LN837 UT WOS:A1993LN83700034 PM 20830043 ER PT J AU KRAUSEPOLSTORFF, J MURPHY, EA WALTERS, DL AF KRAUSEPOLSTORFF, J MURPHY, EA WALTERS, DL TI INSTRUMENT COMPARISON - CORRECTED STELLAR SCINTILLOMETER VERSUS ISOPLANOMETER SO APPLIED OPTICS LA English DT Article ID TURBULENCE; SCINTILLATIONS AB The scintillation pattern from a single star can be utilized to provide information on the refractive turbulence along the line of sight. Instruments that provide refractive turbulence parameters are the isoplanometer and the stellar scintillometer. Attention is drawn to the fact that the National Oceanic and Atmospheric Administration theoretical treatment and implementation of the stellar scintillometer is incomplete. The theory is corrected for spectral effects and finite aperture. A comparison is made of simultaneously obtained isoplanometer values and stellar scintillometer-derived values for isoplanatic angle. The measurements are obtained from an electro-optical/meteorological experiment conducted at Pennsylvania State University in April and May 1986. An atmospheric drop-off model is used to extrapolate the scintillometer measurements beyond the heights probed. Agreement between the two instruments is significantly improved after the appropriate corrections are applied to the scintillometer data. These data were obtained during widely varying meteorological conditions that provided the opportunity for comparisons over a wide range of isoplanatic angles (3 to 14 murad). Over the 5 days that data were obtained, relative percent departures of mean isoplanatic angles derived from the corrected stellar scintillometer are within 10% of the mean isoplanometer isoplanatic angle values. The uncorrected departures range from 16% to 24%. C1 USN, POSTGRAD SCH, MONTEREY, CA 93943 USA. RP KRAUSEPOLSTORFF, J (reprint author), PHILLIPS LAB, AFSC, BEDFORD, MA 01731 USA. NR 22 TC 15 Z9 15 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 JUL 20 PY 1993 VL 32 IS 21 BP 4051 EP 4057 PG 7 WC Optics SC Optics GA LN837 UT WOS:A1993LN83700037 PM 20830046 ER PT J AU WEIDMAN, DJ RHEE, MJ SCHNEIDER, RF NGUYEN, KT STARK, RA AF WEIDMAN, DJ RHEE, MJ SCHNEIDER, RF NGUYEN, KT STARK, RA TI RADIUS TAILORING OF AN INTENSE RELATIVISTIC ELECTRON-BEAM USING A FAST RISE-TIME FOCUSING COIL SO APPLIED PHYSICS LETTERS LA English DT Article ID HOSE INSTABILITY; REGIME AB A ''radius-tailored'' electron beam, which is tapered with a larger head and a smaller tail, has been generated. This has been accomplished by injecting the electron beam into a fast rise-time magnetic focusing coil, so that the beam head expands while the beam body and tail are confined by the axial magnetic field. Time-resolved beam radius measurements indicate that a beam radius tailoring on the order of 3 to 1 has been achieved. This result is also in agreement with computer simulations. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 25 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 19 PY 1993 VL 63 IS 3 BP 311 EP 313 DI 10.1063/1.110766 PG 3 WC Physics, Applied SC Physics GA LN238 UT WOS:A1993LN23800013 ER PT J AU TWIGG, ME FATEMI, M TADAYON, B AF TWIGG, ME FATEMI, M TADAYON, B TI SOLID-PHASE REGROWTH OF AMORPHOUS GAAS GROWN BY LOW-TEMPERATURE MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID LAYERS AB We have shown that solid-phase recrystallization of an amorphous GaAs film can form a single-crystal film. We observed the phenomenon in GaAs, deposited by molecular-beam epitaxy at a growth temperature (T(g)) of 190-degrees-C and annealed at 775 or 850-degrees-C. Observations in the transmission electron microscope indicate that annealing brings about a lower degree of As precipitation in the as-grown amorphous films (T(g) < 215 -degrees-C) than in the as-grown single-crystal films (340-degrees-C > T(g) > 215-degrees-C). The lower degree of As precipitation in the initially amorphous material appears to insure a high concentration of As donors rather than a high concentration of resistivity increasing As precipitates. Electrical measurements show that the low-range (T(g) < 215 -degrees-C) annealed sample has an extremely high n-type carrier concentration (10(18) cm-3) and mobility (800 cm2 V-1 s-1). RP TWIGG, ME (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 9 TC 3 Z9 3 U1 2 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 JUL 19 PY 1993 VL 63 IS 3 BP 320 EP 321 DI 10.1063/1.110057 PG 2 WC Physics, Applied SC Physics GA LN238 UT WOS:A1993LN23800016 ER PT J AU WALTON, JH MILLER, JB ROLAND, CM NAGODE, JB AF WALTON, JH MILLER, JB ROLAND, CM NAGODE, JB TI PHASE-TRANSITIONS IN POLYMER BLENDS VIA XE-129 NMR-SPECTROSCOPY SO MACROMOLECULES LA English DT Note ID INTERDIFFUSION; MISCIBILITY; SCATTERING; DIFFUSION; BEHAVIOR C1 USN,RES LAB,DEPT CHEM,CODE 6120,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 24 TC 23 Z9 23 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUL 19 PY 1993 VL 26 IS 15 BP 4052 EP 4054 DI 10.1021/ma00067a051 PG 3 WC Polymer Science SC Polymer Science GA LN821 UT WOS:A1993LN82100051 ER PT J AU TANG, H WELLER, D WALKER, TG SCOTT, JC CHAPPERT, C HOPSTER, H PANG, AW DESSAU, DS PAPPAS, DP AF TANG, H WELLER, D WALKER, TG SCOTT, JC CHAPPERT, C HOPSTER, H PANG, AW DESSAU, DS PAPPAS, DP TI MAGNETIC RECONSTRUCTION OF THE GD(0001) SURFACE SO PHYSICAL REVIEW LETTERS LA English DT Article ID ORDERING TEMPERATURE; PHOTOEMISSION; ANISOTROPY; GADOLINIUM; TRANSITION; GD AB The surface magnetism of Gd(0001) films is studied using spin resolved electron spectroscopies. Both a canted surface magnetization vector out of the plane of the film and an enhanced surface magnetic ordering temperature 60 +/- 2 K higher than the bulk Curie temperature are observed. Our results show that the surface magnetic layer behaves as a separate entity from the bulk. The in-plane component of surface magnetization aligns ferromagnetically to the bulk. Spin resolved photoemission from the Gd 4f core levels shows almost-equal-to 65% spin polarization at 150 K, which extrapolates to almost-equal-to 91% at 0 K. C1 UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717. UNIV CALIF IRVINE,INST SURFACE & INTERFACE SCI,IRVINE,CA 92717. IBM CORP,ALMADEN RES CTR,DIV RES,SAN JOSE,CA 95120. STANFORD UNIV,STANFORD ELECTR LAB,STANFORD,CA 94309. USN,RES LAB,WASHINGTON,DC 20375. NR 34 TC 136 Z9 136 U1 0 U2 7 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 JUL 19 PY 1993 VL 71 IS 3 BP 444 EP 447 DI 10.1103/PhysRevLett.71.444 PG 4 WC Physics, Multidisciplinary SC Physics GA LN185 UT WOS:A1993LN18500035 ER PT J AU GRATE, JW ROSEPEHRSSON, SL VENEZKY, DL KLUSTY, M WOHLTJEN, H AF GRATE, JW ROSEPEHRSSON, SL VENEZKY, DL KLUSTY, M WOHLTJEN, H TI SMART SENSOR SYSTEM FOR TRACE ORGANOPHOSPHORUS AND ORGANOSULFUR VAPOR DETECTION EMPLOYING A TEMPERATURE-CONTROLLED ARRAY OF SURFACE-ACOUSTIC-WAVE SENSORS, AUTOMATED SAMPLE PRECONCENTRATION, AND PATTERN-RECOGNITION SO ANALYTICAL CHEMISTRY LA English DT Article ID SEMICONDUCTOR GAS SENSORS; CHEMICAL-ANALYSIS; DEVICES; RESPONSES; MICROINSTRUMENTATION; MICROSENSORS; SELECTION; COATINGS; PROBES; DESIGN AB A smart sensor system for the detection of toxic organophosphorus and toxic organosulfur vapors at trace concentrations has been designed, fabricated, and tested against a wide variety of vapor challenges. The key features of the system are an array of four surface acoustic wave (SAW) vapor sensors, temperature control of the vapor sensors, the use of pattern recognition to analyze the sensor data, and an automated sampling system including thermally desorbed preconcentrator tubes (PCTs). All the electronics necessary to control and operate the various subsystems and to collect and process the data are included in the system. Organophosphorus analytes were detected at concentrations as low as 0.01 mg/m3 in 2 min, and the organosulfur analyte was detected at 0.5 mg/m3 in 2 min. Pattern recognition algorithms correctly classified these analytes at these concentrations and discriminated them for a variety of other organic vapors. C1 USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. MICROSENSOR SYST INC, BOWLING GREEN, KY 42103 USA. NR 44 TC 143 Z9 150 U1 3 U2 21 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 JUL 15 PY 1993 VL 65 IS 14 BP 1868 EP 1881 DI 10.1021/ac00062a011 PG 14 WC Chemistry, Analytical SC Chemistry GA LM748 UT WOS:A1993LM74800011 ER PT J AU XIE, H WANG, WI MEYER, JR HOFFMAN, CA BARTOLI, FJ AF XIE, H WANG, WI MEYER, JR HOFFMAN, CA BARTOLI, FJ TI ENHANCEMENT OF INTERSUBBAND STARK EFFECTS IN L-VALLEY STEP QUANTUM-WELLS FOR INFRARED MODULATION AND VOLTAGE TUNABLE DETECTION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ORIENTATION DEPENDENCE; ELECTRIC-FIELD; ABSORPTION; SUPERLATTICES; TRANSITIONS; BAND; SWITCH AB We propose a new type of optical modulator employing two-step Ga1-xAlxSb/Ga1-yAlySb/Ga1-zAlzSb L-valley quantum wells to enhance the Stark shifts of the intersubband transition energy and therefore to achieve large absorption spectral changes with applied bias. Due to the effective-mass anisotropy of electrons in the L-valleys and the tilted growth direction with respect to the valleys, this novel structure can intrinsically absorb normal incidence light. Under an electric field of 50 kV/cm, a blue shift of the absorption peak from 10.9 to 9.8 mum was found from our calculations in a Ga0.7Al0.3Sb/Ga0.5Al0.5Sb/Ga0.4Al0.6Sb structure with a Ga0.7Al0.3Sb well width of 25 angstrom and a Ga0.5Al0.5Sb step width of 25 angstrom. The ability to absorb normally incident light and to achieve significant Stark effects with bias makes this structure an attractive choice for such high-speed optoelectronic devices as vertical infrared light modulators and voltage tunable photodetectors. 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 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 JUL 15 PY 1993 VL 74 IS 2 BP 1195 EP 1198 DI 10.1063/1.354920 PG 4 WC Physics, Applied SC Physics GA LM782 UT WOS:A1993LM78200066 ER PT J AU MAY, DA HOLYER, RJ AF MAY, DA HOLYER, RJ TI SENSITIVITY OF SATELLITE MULTICHANNEL SEA-SURFACE TEMPERATURE RETRIEVALS TO THE AIR-SEA TEMPERATURE DIFFERENCE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID INFRARED MEASUREMENTS; ALGORITHMS; OCEAN; SPACE; OPTIMIZATION; VALIDATION AB The advanced very high resolution radiometer multichannel sea surface temperature (MCSST) retrieval technique provides global algorithm accuracy statistics generally showing a bias of less than 0.1-degrees-C and an rms error of less than 0.7-degrees-C when compared to colocated drifting buoy in situ data in the absence of aerosols. This remaining error is not always random but is shown to be correlated to the air-sea temperature difference. The MCSST technique is modeled and then compared to in situ data to show this dependency. Atmospheric radiative transfer calculations are used to provide a simulation of satellite retrieval sensitivity to air-sea temperature differences. Buoy sea surface temperature (SST) and air temperature observations are then presented as experimental verification of the simulation results. Retrieval errors depend both on the mean air-sea temperature difference conditions present in the data set used to empirically derive the algorithm and on the changes in air-sea temperature difference conditions relative to the derivation data set mean conditions. Retrieval error is found to respond linearly with air-sea temperature difference changes. MCSST retrieval errors of 1.0-degrees-C can occur for air-sea temperature difference changes of 7-degrees-10-degrees-C from mean conditions when the dual-window (channels 3 and 4) or triple-window (channels 3, 4, and 5) algorithms are used. The split-window (channels 4 and 5) MCSST algorithm is shown to be less sensitive to air-sea temperature differences. Cross-product SST (CPSST) and nonlinear SST (NLSST) algorithms are also examined. These algorithms generate results similar to the MCSST algorithm for the dual- and triple-window equations. However, the CPSST and NLSST split-window algorithms demonstrate greater sensitivity to air-sea temperature difference changes than do the MCSST split-window algorithm. Retrieval errors of 1-degrees-C can occur for air-sea temperature difference changes of 10-degrees-12-degrees-C from mean conditions. Users of satellite SST retrievals in regions that experience large fluctuations in air-sea temperature difference should be aware of this possible error source. RP MAY, DA (reprint author), USN,RES LAB,REMOTE SENSING APPLICAT BRANCH,BAY ST LOUIS,MS 39529, USA. NR 26 TC 13 Z9 13 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD JUL 15 PY 1993 VL 98 IS C7 BP 12567 EP 12577 DI 10.1029/93JC00913 PG 11 WC Oceanography SC Oceanography GA LN310 UT WOS:A1993LN31000022 ER PT J AU MCNELLEY, TR CROOKS, R KALU, PN ROGERS, SA AF MCNELLEY, TR CROOKS, R KALU, PN ROGERS, SA TI PRECIPITATION AND RECRYSTALLIZATION DURING PROCESSING OF A SUPERPLASTIC AL-10MG-0.1ZR ALLOY SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT WORKSHOP ON GRAIN BOUNDARY AND INTERFACE PHENOMENA IN THE HIGH TEMPERATURE PLASTICITY OF SOLIDS CY OCT 12-16, 1992 CL OAKLAND, CA SP US DOE, OFF BASIC ENERGY SCI, DIV MAT SCI ID 2ND PHASE PARTICLES; ALUMINUM AB Microstructural evolution during thermomechanical processing (TMP) of a superplastic Al-10Mg-0.1Zr (weight per cent) alloy was studied. The TMP was carried out at 300-degrees-C and consisted of 12 rolling passes corresponding to a total strain of 2.5. Superplastic elongations at 300-degrees-C exceeded 1 000% for an optimum processing schedule involving a 30 min interpass anneal (IPA) time. Precipitation of the intermetallic beta-phase (Al8Mg5) was complete at an accumulated strain of 1.5 and the precipitate particle size and size distribution were found to be nearly constant for the remainder of the TMP. Particle stimulated nucleation (PSN) of recrystallization associated with prolonged IPA times accounted for the grain refinement necessary to support superplastic deformation. A model for PSN is applied to the data. RP MCNELLEY, TR (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MAT ENGN PROGRAM,MONTEREY,CA 93943, USA. NR 24 TC 5 Z9 5 U1 2 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 JUL 15 PY 1993 VL 166 IS 1-2 BP 135 EP 143 DI 10.1016/0921-5093(93)90317-8 PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA LR199 UT WOS:A1993LR19900014 ER PT J AU YILDIRIM, T HARRIS, AB ERWIN, SC PEDERSON, MR AF YILDIRIM, T HARRIS, AB ERWIN, SC PEDERSON, MR TI MULTIPOLE APPROACH TO ORIENTATIONAL INTERACTIONS IN SOLID C(60) SO PHYSICAL REVIEW B LA English DT Article ID LOCAL-DENSITY-APPROXIMATION; ORDERING TRANSITION; PHASE-TRANSITIONS; GROUND-STATE; C-60; C60; SIMULATIONS; BUCKMINSTERFULLERENE; TEMPERATURE; MOLECULES AB We calculate electrostatic multipole moments of C60 up to 1 = 18 using the quantum-mechanical charge distribution with icosahedral symmetry obtained from ab initio calculations. it is found that the second nonzero moment (l = 10) is comparable to the first nonzero moment (l = 6). The values of several low-order multipole moments axe almost ten times smaller than those found from the charge distribution of recently proposed potential models and thus the actual Coulomb interaction between C60 is much smaller than previously predicted. Much better agreement with calculated multipoles is obtained from a model which introduces point charges at the center of hexagonal and pentagonal plaquettes, following the physical arguments of David et al. [Nature 353, 147 (1991)]. We show that a multipole expansion including only l = 6 and 10 moments can predict the potential due to a molecule at distances R greater-than-or-equal-to 2R0 within an error of about 5%, where Ro is the radius of the C60 molecule. At distances less than R < 3/2R0 the multipole expansion is qualitatively incorrect even if one includes the terms up to l = 18, indicating the importance of short-range quantum effects at these distances. The Coulomb interaction we obtain predicts two nearly degenerate, locally stable configurations for solid C60: (1) a metastable structure with Pa3 symmetry and setting angle phi = 23.3-degrees, close to experimentally observed value, and (2) a global minimum with the Pa3 structure but a setting angle phi = 93.6-degrees. We give physical arguments for expecting two such configurations and give a qualitative explanation for their near degeneracy. We conclude that a satisfactory intermolecular potential requires a first-principles calculation of the quantum-mechanical short-range repulsive interactions. C1 USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP UNIV PENN, DEPT PHYS, PHILADELPHIA, PA 19104 USA. RI yildirim, taner/A-1290-2009; Erwin, Steven/B-1850-2009; harris, A Brooks/C-8640-2013 NR 37 TC 33 Z9 34 U1 0 U2 1 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 15 PY 1993 VL 48 IS 3 BP 1888 EP 1898 DI 10.1103/PhysRevB.48.1888 PG 11 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000064 ER PT J AU HOFFMAN, CA MEYER, JR BARTOLI, FJ WANG, WI AF HOFFMAN, CA MEYER, JR BARTOLI, FJ WANG, WI TI SHUBNIKOV-DEHAAS AND HALL OSCILLATIONS IN INAS-GA1-XINXSB SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Note ID INTERFACE ROUGHNESS SCATTERING; STRAINED-LAYER SUPERLATTICES; HGTE-CDTE SUPERLATTICES; QUANTUM-WELLS; INAS/GA1-XINXSB SUPERLATTICES; BAND-STRUCTURE; GAP; SEMICONDUCTORS; GASB/INAS; SYSTEM AB We report a quantum transport investigation of n-type InAs-Ga1-xInxSb superlattices. Our data display Shubnikov-de Haas oscillations in the diagonal conductivity accompanied by plateaulike inflections in the Hall conductivity. Correlation of the oscillation periods with carrier densities obtained from mixed-conduction analyses of the nonoscillating conductivity components implies that the electron effective mass is nearly isotropic. Because of the large miniband width (> 150 meV), one can rule out the conventional quantum Hall effect as the source of the structure in the Hall conductivity. It is instead attributed to a high density of localized states at the bottom of each Landau level, resulting from interface-roughness-induced potential fluctuations. C1 COLUMBIA UNIV,DEPT ELECT ENGN,NEW YORK,NY 10027. RP HOFFMAN, CA (reprint author), USN,WASHINGTON,DC 20375, USA. NR 26 TC 11 Z9 11 U1 2 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 3 BP 1959 EP 1962 DI 10.1103/PhysRevB.48.1959 PG 4 WC Physics, Condensed Matter SC Physics GA LP050 UT WOS:A1993LP05000080 ER PT J AU RUDIN, S REINECKE, TL AF RUDIN, S REINECKE, TL TI PLASMONS LOCALIZED AT POINT CHARGES IN SEMICONDUCTOR QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON PHONON INTERACTION; COLLECTIVE EXCITATIONS; HETEROSTRUCTURES AB The plasmon excitations of inhomogeneous carrier gases in semiconductor quantum wells in the presence of charged impurities are investigated. The random phase approximation for the carrier gas yields an integral equation which expresses the condition that plasmons may be self-consistently localized in the vicinity of the impurity. The localized plasmon is a density wave trapped at the impurity site and exists in the electron (hole) gas only for negative (positive) impurity charge. Bound states of the intersubband plasmon are found for all densities of the carrier gas in a quantum well, a result which differs qualitatively from the bulk case. Numerical results for the binding energies are given for a range of parameters. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP USA, RES LAB, FT MONMOUTH, NJ 07703 USA. NR 9 TC 5 Z9 5 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1993 VL 48 IS 4 BP 2223 EP 2235 DI 10.1103/PhysRevB.48.2223 PG 13 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000024 ER PT J AU BERMUDEZ, VM KAPLAN, R KHAN, MA KUZNIA, JN AF BERMUDEZ, VM KAPLAN, R KHAN, MA KUZNIA, JN TI GROWTH OF THIN NI FILMS ON GAN(0001)-(1X1) SO PHYSICAL REVIEW B LA English DT Article ID LEAST-SQUARES ANALYSIS; MEAN FREE PATHS; PHOTOEMISSION DATA; INITIAL OXIDATION; 50-2000-EV RANGE; GAN; SPECTROSCOPY; GAAS(110); INTERFACE; SURFACES AB The growth and structure of Ni films, formed by in situ deposition on atomically clean GaN(0001)-(1 X 1) surfaces, have been studied using Auger, electron-energy-loss, and ultraviolet-photoemission spectroscopies, and low-energy electron diffraction. Near room temperature, a disordered film grows in a continuous, layer-by-layer mode. Annealing a thin layer at approximately 700-800-degrees-C forms ordered Ni islands in registry with the GaN. The resulting Ni(111)-(1 X 1) surface then induces ordering during subsequent deposition of thicker Ni layers near room temperature. Chemical reaction at the interface occurs even near room temperature. The N released appears near the Ni surface, while the free Ga remains near the interface. Annealing at T greater-than-or-equal-to 600-degrees-C leads to the loss of N by desorption and to extensive intermixing of Ga and Ni. Depending on annealing temperature, Ga-induced (square-root 3 X square-root 3)R 30-degrees or (2 X 2) superstructures are observed on the Ni(111) surface. A Ga metal film deposited on the Ni layer is able to combine with some of the N, escaping during high-temperature annealing, to reform a poorly ordered GaN phase. C1 APA OPT INC,BLAINE,MN 55434. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 44 TC 78 Z9 78 U1 3 U2 9 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2436 EP 2444 DI 10.1103/PhysRevB.48.2436 PG 9 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000044 ER PT J AU HAFTEL, MI AF HAFTEL, MI TI SURFACE RECONSTRUCTION OF PLATINUM AND GOLD AND THE EMBEDDED-ATOM MODEL SO PHYSICAL REVIEW B LA English DT Article ID CORRECTED EFFECTIVE-MEDIUM; 100 CRYSTAL FACES; MOLECULAR-DYNAMICS; METALS; FCC; AG; RELAXATIONS; DERIVATION; ENERGETICS; PT(110) AB We investigate the surface reconstructions of various faces of gold and platinum theoretically with a number of embedded-atom potentials. The potentials examined include conventional models plus a sequence of models where the shape of the embedding function has been varied for electron densities typical of the surface. We find that whereas all models predict virtually equivalent bulk properties, only potentials with a sufficient curvature in the embedding function predict the experimentally observed buckled quasihexagonal reconstruction for the (100) faces. Furthermore, the models that predict this reconstruction also give surface energies in close agreement with experiment, unlike most of the conventional models. Almost all embedded-atom potentials considered predict the observed missing-row structure for the (110) faces, and some the observed missing-row structure for the (311) face of platinum. We take the best combination of Au and Pt potentials and calculate the structure of a Pt(100) substrate in the presence of Au adatoms. In good agreement with experiment, the quasihexagonal reconstruction is lost for coverage greater than 0.4 monolayers. RP HAFTEL, MI (reprint author), USN,RES LAB,CODE 6651,WASHINGTON,DC 20375, USA. NR 30 TC 80 Z9 81 U1 0 U2 9 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2611 EP 2622 DI 10.1103/PhysRevB.48.2611 PG 12 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000066 ER PT J AU PEDERSON, MR LAOUINI, N AF PEDERSON, MR LAOUINI, N TI COVALENT CONTAINER COMPOUND - EMPTY, ENDOHEDRAL, AND EXOHEDRAL C-28 COMPLEXES SO PHYSICAL REVIEW B LA English DT Article ID LOCAL-DENSITY-APPROXIMATION; C-60; SUPERCONDUCTIVITY; SIMULATIONS; STABILIZATION; FULLERENE; CLUSTERS; DIAMOND AB Results from quasidynamical local-density simulations on a small fullerene complex (C28), three endohedral complexes (C28@C, C28@Zr, and C28@Ti), a C atom bound to the comer of the C28 molecule, and C28H4 are presented. This molecule forms spontaneously from a 29-atom diamond crystallite and, under proper circumstances, is a covalent container compound. Upon encapsulation of a Zr atom, 12.6 eV of energy is liberated leading to an unreactive closed-shell C28@Zr molecule. The open-shell structure of the empty molecule leads to a reactive yet relatively stable building block which might be useful for synthesis of new metastable forms of carbon-based materials. Electronic structures, ionization energies, electron affinities, equilibrium geometries, and bare Hubbard U parameters are presented. C1 MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART 1,GERMANY. RP PEDERSON, MR (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 28 TC 47 Z9 48 U1 0 U2 1 PU AMERICAN 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 JUL 15 PY 1993 VL 48 IS 4 BP 2733 EP 2737 DI 10.1103/PhysRevB.48.2733 PG 5 WC Physics, Condensed Matter SC Physics GA LP540 UT WOS:A1993LP54000081 ER PT J AU OELSCHLAEGER, TA GUERRY, P KOPECKO, DJ AF OELSCHLAEGER, TA GUERRY, P KOPECKO, DJ TI UNUSUAL MICROTUBULE-DEPENDENT ENDOCYTOSIS MECHANISMS TRIGGERED BY CAMPYLOBACTER-JEJUNI AND CITROBACTER-FREUNDII SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE COATED-PITS; CYTOSKELETON; ENDOSOME ACIDIFICATION; MICROFILAMENTS; PROTEIN SYNTHESIS ID RECEPTOR-MEDIATED ENDOCYTOSIS; INTESTINAL EPITHELIAL-CELLS; COATED PIT FORMATION; SHIGELLA-FLEXNERI; ESCHERICHIA-COLI; HELA-CELLS; INVASION; PENETRATION; SALMONELLA; INFECTION AB Bacterial invasion of six different human epithelial cell lines showed that some strains of the intestinal pathogen Campylobacter jejuni invaded intestinal cell lines at a level 10(2)-10(4) times higher than reported previously for other Campylobacter strains. Separately, urinary tract isolates of Citrobacter freundii triggered a high-efficiency invasion of bladder cells. Use of multiple inhibitors with known effects on eukaryotic cell structures/processes allowed us to define in these genetically distinct bacterial genera unusual bacterial invasion mechanisms that uniquely require microtubules but not microfilaments. Campylobacter jejuni strain 81-176 uptake into 407 intestinal cells and Citrobacter entry into T24 bladder cells was blocked by microtubule depolymerization and inhibitors of coated-pit formation but not by microfilament depolymerization. Inhibitors of endosome acidification had no significant impact on intracellular survival of Campylobacter jejuni or Citrobacter freundii, but monensin markedly reduced Citrobacter uptake. Epithelial cell invasion by both of these bacterial genera was dependent upon de novo bacterial protein synthesis but not upon de novo eukaryotic cell protein synthesis. In contrast to the T24 cell line-specific, strict microtubule-dependent uptake, Citrobacter entry into other cell lines was inhibited by both microtubule and microfilament-depolymerization, suggesting that these bacteria encode two separate pathways for uptake (i, microtubule-dependent; ii, microfilament-dependent) that are cell line-specific and are recognized perhaps depending on the presence and abundance of appropriate eukaryotic receptors. C1 USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD 20814. RP OELSCHLAEGER, TA (reprint author), WALTER REED ARMY INST RES,DEPT BACTERIAL IMMUNOL,WASHINGTON,DC 20307, USA. RI Oelschlaeger, Tobias/B-5624-2015 NR 30 TC 226 Z9 232 U1 1 U2 9 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 JUL 15 PY 1993 VL 90 IS 14 BP 6884 EP 6888 DI 10.1073/pnas.90.14.6884 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA LM681 UT WOS:A1993LM68100104 PM 8341714 ER PT J AU AYERS, JD JONES, HN VOLD, CL AF AYERS, JD JONES, HN VOLD, CL TI STABILIZATION OF ALUMINUM AND MAGNESIUM BASE METALLIC GLASSES BY THE ADDITION OF CALCIUM SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID AMORPHOUS-ALLOYS; GOOD DUCTILITY; NI RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 10 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUL 15 PY 1993 VL 29 IS 2 BP 205 EP 209 DI 10.1016/0956-716X(93)90309-G PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA LF820 UT WOS:A1993LF82000011 ER PT J AU HSU, DSY GRAY, HF AF HSU, DSY GRAY, HF TI CONFORMAL CHEMICAL BEAM DEPOSITION OF THIN METAL-FILM FOR FABRICATING HIGH-DENSITY TRENCH CAPACITOR CELLS SO APPLIED PHYSICS LETTERS LA English DT Article ID PLATINUM AB The difficult aspect of conformal metal film deposition in narrow, high aspect ratio trenches such as those used in the fabrication of high density metal-oxide-semiconductor trench capacitor cells for computer memory technology is addressed. This work demonstrates the proof of principle of highly conformal deposition of a 40 nm Pt film on the surfaces of a 0.5-mum-wide, 1.5-mum-deep, and 2-mm-long array of oxidized silicon trenches, using the thermal decomposition of a molecular precursor under chemical beam conditions. In addition, scanning electron, x-ray photoelectron, and scanning Auger electron microscopy analyses reveal highly uniform and complete coverage on all surfaces, small metal grain size, and the absence of detectable impurities. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. RP HSU, DSY (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. NR 8 TC 7 Z9 7 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 JUL 12 PY 1993 VL 63 IS 2 BP 159 EP 161 DI 10.1063/1.110385 PG 3 WC Physics, Applied SC Physics GA LL831 UT WOS:A1993LL83100013 ER PT J AU WEAVER, BD REEVES, ME SUMMERS, GP SOULEN, RJ AF WEAVER, BD REEVES, ME SUMMERS, GP SOULEN, RJ TI CONTROLLABLE ALTERATION OF THE PINNING ENERGY IN TL2CA2BACU2O8 FILMS BY PROTON IRRADIATION SO APPLIED PHYSICS LETTERS LA English DT Article ID CRITICAL CURRENT-DENSITY; FLUX CREEP; YBA2CU3O7-DELTA; CRYSTAL AB Irradiation with 2 MeV protons increases the vortex pinning energy in Tl2Ca2BaCu2O8 films. The maximum pinning energy occurs at a defect density that depends on (1) the density of flux pinning centers in the unirradiated film, (2) the ratio of pinning energies of the pre- and post-irradiation defects, and (3) the effectiveness of the incident particle in creating pinning centers. An explicit formula for the pinning energy as a function of fluence is proposed. RP WEAVER, BD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 12 PY 1993 VL 63 IS 2 BP 252 EP 254 DI 10.1063/1.110357 PG 3 WC Physics, Applied SC Physics GA LL831 UT WOS:A1993LL83100045 ER PT J AU NICKOLS, FW AF NICKOLS, FW TI WORKING SMALLER BUT LARGER SO FORTUNE LA English DT Letter RP NICKOLS, FW (reprint author), USN,WINDSOR,NJ, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU TIME INC PI NEW YORK PA TIME & LIFE BUILDING ROCKEFELLER CENTER, NEW YORK, NY 10020-1393 SN 0015-8259 J9 FORTUNE JI Fortune PD JUL 12 PY 1993 VL 128 IS 1 BP 30 EP 30 PG 1 WC Business SC Business & Economics GA LH979 UT WOS:A1993LH97900012 ER PT J AU FELDMAN, U AF FELDMAN, U TI IS IT JUSTIFIED TO ASSUME THAT EVERYWHERE IN THE SUNS PHOTOSPHERE-CORONA DOMAIN THE ELECTRIC-CONDUCTIVITY IS HIGH - OR, WHAT DRIVES THE SOLAR UPPER-ATMOSPHERE SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD; SUN, ATMOSPHERE; SUN, CORONA ID THERMAL BIFURCATION; ABUNDANCES; FLARE; MODEL; TEMPERATURE; EMISSION; SPECTRUM; CARBON; OXYGEN; QUIET AB For many years, solar scientists have recognized the extreme complexity of the upper solar atmosphere. However, in order to construct a valid theoretical model they have formulated a set of simplified assumptions governing the makeup of the Sun's upper atmosphere. In previous papers (Feldman 1983; Feldman 1993) a number of assumptions used to construct the models were shown not to be valid. In this Paper I bring evidence to question the validity of the last and most important of the assumptions, the assertion that ''Everywhere in the photosphere-corona domain the electric conductivity is HIGH.'' The consequences of the finding are briefly discussed. A laboratory measurement of the electrical conductivity versus temperature in a gas with photospheric composition would resolve this important issue and seem to be feasible. RP USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 57 TC 25 Z9 25 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD JUL 10 PY 1993 VL 411 IS 2 BP 896 EP 908 DI 10.1086/172894 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ884 UT WOS:A1993LJ88400049 ER PT J AU BROPHY, TJ BOBB, LC SHANKAR, PM AF BROPHY, TJ BOBB, LC SHANKAR, PM TI IN-LINE SINGLEMODE FIBER INTERFEROMETER VIA CONCATENATED BICONICAL TAPERS SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL FIBERS; OPTICAL COUPLERS; LIGHT INTERFEROMETRY AB Tapers in singlemode optical fibre cause the light to be redistributed among sustainable core and cladding modes. Changes in transmission by interference between these modes when recombined in a second taper occur when the fibre is heated between the tapers. C1 DREXEL UNIV,DEPT ELECT & COMP ENGN,PHILADELPHIA,PA 19104. RP BROPHY, TJ (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,ST & JACKSONVILLE RD,WARMINSTER,PA 18974, USA. OI shankar, P/0000-0002-9719-9700 NR 5 TC 4 Z9 4 U1 1 U2 2 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 JUL 8 PY 1993 VL 29 IS 14 BP 1276 EP 1277 DI 10.1049/el:19930852 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA LW317 UT WOS:A1993LW31700029 ER PT J AU MCQUEEN, PG HESS, DW SERENE, JW AF MCQUEEN, PG HESS, DW SERENE, JW TI FORMATION OF A COHERENT HEAVY-ELECTRON STATE IN THE ANDERSON LATTICE MODEL SO PHYSICAL REVIEW LETTERS LA English DT Article ID PERTURBATION-THEORY; HUBBARD-MODEL; SYSTEMS; METALS AB We present self-consistent calculations for the self-energy, thermodynamic potential, and magnetic susceptibility of the 2D asymmetric Anderson lattice Hamiltonian, in the fluctuation exchange approximation. For parameters that yield a large local moment, a narrow peak at the Fermi energy grows out of an otherwise smooth density of states as the system is cooled. The height of the peak reaches a maximum and then decreases, signaling the onset of coherence. The susceptibility shows a similar temperature dependence. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD. RP MCQUEEN, PG (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 22 TC 11 Z9 11 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 JUL 5 PY 1993 VL 71 IS 1 BP 129 EP 132 DI 10.1103/PhysRevLett.71.129 PG 4 WC Physics, Multidisciplinary SC Physics GA LK368 UT WOS:A1993LK36800034 ER PT J AU UHM, HS AF UHM, HS TI THE PLASMA KLYSTRON AMPLIFIER SO PHYSICS LETTERS A LA English DT Article ID RELATIVISTIC ELECTRON-BEAMS; GENERATION; INSTABILITY; POWER AB A novel plasma klystron amplifier is presented in which current modulation of a relativistic electron beam is achieved by the unstable two-stream interaction between the electron beam and a plasma column. A model to describe current modulation is developed. Due to a relatively large growth rate of the instability, the required interaction length of the beam and plasma column is short for most applications. A full current modulation can be achieved in the plasma klystron amplifiers. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,WHITE OAK,SILVER SPRING,MD 20903, USA. NR 10 TC 0 Z9 0 U1 1 U2 1 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 JUL 5 PY 1993 VL 178 IS 1-2 BP 160 EP 164 DI 10.1016/0375-9601(93)90744-K PG 5 WC Physics, Multidisciplinary SC Physics GA LL593 UT WOS:A1993LL59300028 ER PT J AU KENNEY, WL HYDE, DE BERNARD, TE AF KENNEY, WL HYDE, DE BERNARD, TE TI PHYSIOLOGICAL EVALUATION OF LIQUID-BARRIER, VAPOR-PERMEABLE PROTECTIVE CLOTHING ENSEMBLES FOR WORK IN HOT ENVIRONMENTS SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article AB Work clothes using fabrics with vapor-transmitting characteristics are in limited use in various industrial applications, and there is a growing interest in their purported ability to help reduce heat stress. This study was performed to compare two vapor-transmitting ensembles with other clothing ensembles previously tested. The evaluation was based on an established experimental protocol that determines the critical values of air temperature and water-vapor pressure so that an individual maintains thermal balance, while controlling other factors that contribute to worker heat stress (e.g., air motion and metabolism). There were no differences between the two vapor-transmitting garments in their effects on worker heat stress. When compared to the results of other studies, the two vapor-transmitting garments had critical environmental characteristics similar to two layers of cotton coveralls and they performed better from a heat stress stand-point than a disposable vapor-barrier suit worn over cloth coveralls. C1 UNIV S FLORIDA, COLL PUBL HLTH, TAMPA, FL 33612 USA. PENN STATE UNIV, HUMAN PERFORMANCE RES LAB, UNIV PK, PA 16802 USA. USN, RES INST, HYPERBAR ENVIRONM ADAPTAT PROGRAM, BETHESDA, MD 20889 USA. NR 15 TC 1 Z9 1 U1 0 U2 1 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 USA SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD JUL PY 1993 VL 54 IS 7 BP 397 EP 402 DI 10.1202/0002-8894(1993)054<0397:PEOLVP>2.0.CO;2 PG 6 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA LX340 UT WOS:A1993LX34000010 ER PT J AU LAMMERT, GR KLINGELBERGER, C AF LAMMERT, GR KLINGELBERGER, C TI RED LABELS FOR INDUSTRIAL-STRENGTH MAGNESIUM SO AMERICAN JOURNAL OF EMERGENCY MEDICINE LA English DT Letter RP LAMMERT, GR (reprint author), USN HOSP,SAN DIEGO,CA 92134, 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 JUL PY 1993 VL 11 IS 4 BP 431 EP 431 DI 10.1016/0735-6757(93)90182-B PG 1 WC Emergency Medicine SC Emergency Medicine GA LP441 UT WOS:A1993LP44100023 PM 8216532 ER PT J AU NEWTON, JA WEISS, PJ LITYNSKI, JJ AF NEWTON, JA WEISS, PJ LITYNSKI, JJ TI DIARRHEA IN PNEUMOCYSTIS-CARINII PNEUMONIA SO AMERICAN JOURNAL OF GASTROENTEROLOGY LA English DT Letter ID IMMUNODEFICIENCY C1 USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134. USN HOSP,DEPT INFECT DIS,SAN DIEGO,CA 92134. USN HOSP,DEPT GASTROENTEROL DIV,SAN DIEGO,CA 92134. RP NEWTON, JA (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0002-9270 J9 AM J GASTROENTEROL JI Am. J. Gastroenterol. PD JUL PY 1993 VL 88 IS 7 BP 1138 EP 1139 PG 2 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA LL286 UT WOS:A1993LL28600042 PM 8317427 ER PT J AU NESBIT, GM AF NESBIT, GM TI OVERSIGHT BY AUTHORS SO AMERICAN JOURNAL OF NEURORADIOLOGY LA English DT Letter RP NESBIT, GM (reprint author), USN,DEPT RADIOL,SAN DIEGO,CA 92134, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NEURORADIOLOGY PI OAK BROOK PA 2210 MIDWEST RD, OAK BROOK, IL 60521 SN 0195-6108 J9 AM J NEURORADIOL JI Am. J. Neuroradiol. PD JUL-AUG PY 1993 VL 14 IS 4 BP 1023 EP 1024 PG 2 WC Clinical Neurology; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging SC Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA LM070 UT WOS:A1993LM07000043 PM 8352142 ER PT J AU GILLESPIE, DT AF GILLESPIE, DT TI AN EXACT MARKOVIAN ANALYSIS OF EFFUSION SO AMERICAN JOURNAL OF PHYSICS LA English DT Article ID DILUTE GAS AB Effusion in an ideal gas is analyzed stochastically, without imposing any approximations on the governing master equation. The exercise affords a physically motivated survey, at a fairly elementary level, of some key concepts, techniques and results of Markov process theory. RP GILLESPIE, DT (reprint author), USN,CTR AIR WARFARE,RES DEPT,CHINA LAKE,CA 93555, USA. NR 4 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 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD JUL PY 1993 VL 61 IS 7 BP 595 EP 600 DI 10.1119/1.17219 PG 6 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA LJ662 UT WOS:A1993LJ66200003 ER PT J AU CUSACK, JR AF CUSACK, JR TI THE WOUNDS OF WAR SO AMERICAN JOURNAL OF PSYCHIATRY LA English DT Editorial Material RP CUSACK, JR (reprint author), USN HOSP,DEPT PSYCHIAT,BOX 134,CHARLESTON,SC 29408, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER PSYCHIATRIC ASSOCIATION PI WASHINGTON PA 1400 K ST NW, WASHINGTON, DC 20005 SN 0002-953X J9 AM J PSYCHIAT JI Am. J. Psychiat. PD JUL PY 1993 VL 150 IS 7 BP 997 EP 999 PG 3 WC Psychiatry SC Psychiatry GA LL398 UT WOS:A1993LL39800001 PM 8317606 ER PT J AU MASTERSON, DM AF MASTERSON, DM TI THE TIME OF THE GENERALS, LATIN-AMERICAN PROFESSIONAL MILITARISM IN WORLD PERSPECTIVE - NUNN,FM SO AMERICAS LA English DT Book Review RP MASTERSON, DM (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ACAD AMER FRANCISCAN HIST PI WEST BETHESDA PA BOX 34440, WEST BETHESDA, MD 20817 SN 0003-1615 J9 AMERICAS JI Americas PD JUL PY 1993 VL 50 IS 1 BP 137 EP 139 DI 10.2307/1007279 PG 3 WC History SC History GA LN032 UT WOS:A1993LN03200017 ER PT J AU BROOK, I GILMORE, JD AF BROOK, I GILMORE, JD TI EVALUATION OF BACTERIAL INTERFERENCE AND BETA-LACTAMASE PRODUCTION IN MANAGEMENT OF EXPERIMENTAL-INFECTION WITH GROUP A BETA-HEMOLYTIC STREPTOCOCCI SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID RECURRENT TONSILLITIS; BACTEROIDES-FRAGILIS; THROAT FLORA; PENICILLIN; PHARYNGITIS; PROTECTION; CHILDREN; OUTBREAK; FAILURE AB The in vivo effects of penicillin and cefprozil therapy on the interaction between organisms commonly recovered from inflamed tonsils were studied by using a subcutaneous abscess model in mice. These organisms were group A beta-hemolytic streptococci (GABHS), Streptococcus salivarius (which is capable of interfering with GABHS), and Staphylococcus aureus. In mice infected with GABHS and S. salivarius alone or in combination, penicillin eliminated both organisms and cefprozil eliminated GABHS and S. aureus but not S. salivarius. Penicillin did not, however, reduce the number of GABHS or S. salivarius in the presence of S. aureus. The present study demonstrated the ability of beta-lactamase-producing S. aureus to protect GABHS from penicillin. However, no such protection was present following the administration of cefprozil. Furthermore, the preservation of S. salivarius that interferes with GABHS growth may provide protection from reinfection with GABHS. This study supports and provides an explanation for the increased efficacies of cephalosporins administered orally over that of penicillin when treating patients with acute GABHS pharyngitis or tonsillitis. RP BROOK, I (reprint author), USN,MED RES INST,BETHESDA,MD 20814, USA. NR 23 TC 31 Z9 31 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD JUL PY 1993 VL 37 IS 7 BP 1452 EP 1455 PG 4 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA LL214 UT WOS:A1993LL21400013 PM 8363375 ER PT J AU BROOK, I AF BROOK, I TI USE OF CEPHALOSPORINS FOR PROPHYLAXIS AND THERAPY OF POLYMICROBIAL INFECTION IN MICE SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID BACTEROIDES-FRAGILIS; INVITRO SUSCEPTIBILITY; ABSCESSES; CEFMETAZOLE; BACTERIA AB Cefoxitin, cefotetan, and cefmetazole were compared in 10-day therapy of intra-abdominal and subcutaneous infections caused by three organisms: Bacteroides-fragilis and Bacteroides thetaiotaomicron combined with either Escherichia coli or Staphylococcus aureus. Intra-abdominal infection was caused by B. fragilis plus B. thetaiotaomicron plus E. coli. Therapy was initiated immediately before inoculation or was delayed for 8 h. Mortality was 14 of 30 (47%) for saline-treated mice, and all survivors developed abscesses. Immediate therapy reduced mortality and the percentage of mice with abscesses (in survivors), respectively, to 17 and 20% with cefoxitin, 0 and 13% with cefotetan, and 0 and 17% with cefmetazole, and the numbers of all bacteria were reduced by all the cephalosporins. Delayed therapy reduced mortality and abscess formation, respectively, to 20 and 8% of mice with cefoxitin, 10 and 93% with cefotetan, and 7 and 96% with cefmetazole. B. thetaiotaomicron survived in all abscesses treated with cefotetan and cefmetazole. Subcutaneous abscesses were caused by each organism alone or in combinations of one aerobe (S. aureus or E. coli) and one or two Bacteroides species. Early therapy reduced the numbers of all bacteria independent of their in vitro susceptibility. All agents reduced the number of each Bacteroides species with either E. coli or S. aureus. However, when therapy was delayed, cefotetan and cefmetazole were less effective than cefoxitin against B. thetaiotaomicron. Cefotetan was the most active agent against E. coli, and cefmetazole was the most effective against S. aureus. These data illustrate the efficacy of all tested cephalosporins in the prophylaxis of polymicrobial infections. RP BROOK, I (reprint author), USN,MED RES INST,BETHESDA,MD 20814, USA. NR 24 TC 2 Z9 2 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD JUL PY 1993 VL 37 IS 7 BP 1531 EP 1535 PG 5 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA LL214 UT WOS:A1993LL21400027 PM 8363386 ER PT J AU BENNETT, JM TAKACS, PZ AF BENNETT, JM TAKACS, PZ TI SURFACE-ROUGHNESS AND SCATTERING - PAPERS FROM THE 1ST TOPICAL MEETING SO APPLIED OPTICS LA English DT Article C1 BROOKHAVEN NATL LAB, DIV INSTRUMENTAT, UPTON, NY 11973 USA. RP BENNETT, JM (reprint author), USN, CTR AIR WARFARE, MICHELSON LAB, RES DEPT, DIV WEAPONS, CHINA LAKE, CA 93555 USA. NR 3 TC 3 Z9 3 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 JUL 1 PY 1993 VL 32 IS 19 BP 3333 EP 3334 PG 2 WC Optics SC Optics GA LK405 UT WOS:A1993LK40500001 PM 20829951 ER PT J AU ELSON, JM BENNETT, JM STOVER, JC AF ELSON, JM BENNETT, JM STOVER, JC TI WAVELENGTH AND ANGULAR-DEPENDENCE OF LIGHT-SCATTERING FROM BERYLLIUM - COMPARISON OF THEORY AND EXPERIMENT SO APPLIED OPTICS LA English DT Article ID STATISTICAL PROPERTIES; OPTICAL-SURFACES AB The purpose of this study was (1) to measure angle-resolved scattering (ARS) and the wavelength dependence of scattering from polished and sputtered beryllium, (2) to measure surface-roughness parameters by profilometry, (3) to calculate the power spectral density (PSD) of the surface roughness and use it with ARS theory to compare with ARS measurements, and (4) to investigate a dual-source scattering theory and compare calculations from the theory with measured ARS. The wavelengths considered here were 0. 633, 1.06, and 10.6 mum, the angle of incidence was 60-degrees, and s and p polarization of the incident and scattered radiation were taken into account both in the theory and in the experiments. Two types of theoretical comparison were attempted. First, two-dimensional PSD functions were calculated from one-dimensional, mechanical-stylus-profile data, and these data were used in first-order roughness ARS theory to compare with ARS measurements. The calculated ARS curves were much too low at some wavelengths and showed incorrect wavelength scaling. Second, a dual-source (surface-roughness and dielectric inhomogeneity) ARS theory was used. In this model the surface-roughness PSD functions calculated from surface-profile data were used, and reasonable values for parameters characterizing the dielectric inhomogeneities were used in an analytic PSD function. This dual-source ARS theory can predict a significantly different angle and wavelength dependence of ARS than that predicted by roughness-only ARS theory. In contrast to ARS predicted by surface roughness alone, it was found that the dual-source theory was able to provide good agreement with measured ARS in angular and wavelength dependence. It is concluded that, for the two beryllium samples studied here, scattering caused by spatial variations in the near-surface dielectric response (variations in reflectance) is a significant and sometimes dominant source of scattering, especially at a 10.6-mum wavelength. C1 TMA TECHNOL INC, BOZEMAN, MT 59715 USA. RP ELSON, JM (reprint author), USN, CTR AIR WARFARE, DIV WEAPONS, RES DEPT, DIV PHYS, CHINA LAKE, CA 93555 USA. NR 17 TC 32 Z9 32 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 JUL 1 PY 1993 VL 32 IS 19 BP 3362 EP 3376 PG 15 WC Optics SC Optics GA LK405 UT WOS:A1993LK40500005 PM 20829955 ER PT J AU BENNETT, JM ELINGS, V KJOLLER, K AF BENNETT, JM ELINGS, V KJOLLER, K TI RECENT DEVELOPMENTS IN PROFILING OPTICAL-SURFACES SO APPLIED OPTICS LA English DT Article ID SCANNING TUNNELING MICROSCOPY; STATISTICAL PROPERTIES; INSTRUMENT AB To understand better the fabrication of optical surfaces and to be able to produce smoother, lower-scatter surfaces, we need to extend characterization techniques to shorter and longer surface spatial wavelengths beyond the conventional 1-mum to 1-mm region. Scanning probe microscopes are now available for profiling optical surfaces with height and lateral resolutions of a few atomic spacings. In this paper we report on measurements made with a Nanoscope II atomic force microscope on a variety of supersmooth optical surfaces and compare these results with measurements made with a conventional stylus profiling instrument. Consistent results have been obtained. To cover the long-spatial-wavelength region, long-scan profilers can be used to measure surface waviness in the range from a few millimeters to a few centimeters with height sensitivities approximately 10 times better than conventional interferometers. The characterization of a Nanostep long-scan mechanical profiler is described, and examples of surface profiles taken on selected flat samples are given. C1 DIGITAL INSTRUMENTS INC, SANTA BARBARA, CA 93103 USA. RP BENNETT, JM (reprint author), USN, CTR AIR WARFARE, MICHELSON LAB, DIV WEAPONS, RES DEPT, CHINA LAKE, CA 93555 USA. NR 21 TC 15 Z9 15 U1 1 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 JUL 1 PY 1993 VL 32 IS 19 BP 3442 EP 3447 PG 6 WC Optics SC Optics GA LK405 UT WOS:A1993LK40500013 PM 20829963 ER PT J AU KULP, TJ GARVIS, D KENNEDY, R SALMON, T COOPER, K AF KULP, TJ GARVIS, D KENNEDY, R SALMON, T COOPER, K TI DEVELOPMENT AND TESTING OF A SYNCHRONOUS-SCANNING UNDERWATER IMAGING-SYSTEM CAPABLE OF RAPID 2-DIMENSIONAL FRAME IMAGING SO APPLIED OPTICS LA English DT Article AB The design and construction of a synchronous-scanning underwater imaging system capable of rapid two-dimensional scanning are described. The imager employs a 7-W, all-lines, argon-ion laser in conjunction with a galvanometrically driven raster scanner and an image-dissector tube receiver. The imager is capable of directly generating real-time RS-170 video imagery. The results of an in-water test of the imaging system, in which a high-contrast imaging test pattern was imaged, demonstrate opereting ranges of up to 4 attenuation lengths (AL) when the test was run at real-time frame rates, ranges of 5. 1-5.5 AL when the system operated with an eight-frame running average, and ranges of 6.3 AL when a 128-frame running average was used. The system performance was compared with that of floodlight/silicon-intensified-target TV camera configurations, which produced a maximum imaging range of approximately 2.6 AL. Also, an imaging configuration that used the raster-scanned beam of the laser as an illumination source for the silicon-intensified-target camera was tested. That system had an ultimate range of approximately 4 AL. C1 USN, OFF SALVAGE & DIVING, SEA SYST COMMAND, WASHINGTON, DC 20362 USA. RP KULP, TJ (reprint author), LAWRENCE LIVERMORE NATL LAB, DIV ENVIRONM SCI, MS L-524, POB 5507, LIVERMORE, CA 94551 USA. NR 18 TC 14 Z9 16 U1 0 U2 5 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 JUL 1 PY 1993 VL 32 IS 19 BP 3520 EP 3530 PG 11 WC Optics SC Optics GA LK405 UT WOS:A1993LK40500026 PM 20829976 ER PT J AU SEELY, JF GUTMAN, G WOOD, J HERMAN, GS KOWALSKI, MP RIFE, JC HUNTER, WR AF SEELY, JF GUTMAN, G WOOD, J HERMAN, GS KOWALSKI, MP RIFE, JC HUNTER, WR TI NORMAL-INCIDENCE REFLECTANCE OF W/B4C MULTILAYER MIRRORS IN THE 34-50-ANGSTROM WAVELENGTH REGION SO APPLIED OPTICS LA English DT Note DE MULTILAYER MIRRORS; EXTREME ULTRAVIOLET ID GRATING CRYSTAL MONOCHROMATOR AB The measured normal-incidence reflectances of W/B4C multilayers mirrors are 2% in the 34-50-angstrom wavelength region and are consistent with interfacial roughness in the range of 3-4 angstrom. C1 OVON SYNTHET MAT CO, TROY, MI 48084 USA. SFA INC, LANDOVER, MD 20785 USA. RP SEELY, JF (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 9 TC 18 Z9 23 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 JUL 1 PY 1993 VL 32 IS 19 BP 3541 EP 3543 PG 3 WC Optics SC Optics GA LK405 UT WOS:A1993LK40500028 PM 20829978 ER PT J AU LICHTENBERG, CL MEYERS, WJ KAWECKI, TG PELTZER, AR JOHNSON, MS NISENOFF, M PRICE, GE AF LICHTENBERG, CL MEYERS, WJ KAWECKI, TG PELTZER, AR JOHNSON, MS NISENOFF, M PRICE, GE TI THE HIGH-TEMPERATURE SUPERCONDUCTIVITY SPACE EXPERIMENT (HTSSE) SO APPLIED SUPERCONDUCTIVITY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF AND EXHIBITION ON WORLD CONGRESS ON SUPERCONDUCTIVITY CY SEP 15-18, 1992 CL MUNICH, GERMANY AB The High Temperature Superconductivity Space Experiment (HTSSE) program, initiated by the Naval Research Laboratory (NRL) in 1988, is described. The HTSSE program focuses high temperature superconductor (HTS) technology applications on space systems. The program phases, goals and objectives are discussed. The devices developed for this program and their suppliers are enumerated. For HTSSE-I, 15 space-qualified, passive microwave devices were integrated onto a cryogenic cold bus as an experimental payload on a DoD spacecraft. The experiment payload and scientific data measurement systems, designed, developed, and built by NRL, are described. C1 BENDIX FIELD ENGN CORP,COLUMBIA,MD. RP LICHTENBERG, CL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0964-1807 J9 APPL SUPERCOND JI Appl. Supercond. PD JUL-SEP PY 1993 VL 1 IS 7-9 BP 1313 EP 1331 DI 10.1016/0964-1807(93)90439-9 PG 19 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA LG392 UT WOS:A1993LG39200047 ER PT J AU STASHOWER, ME YEAGER, JK SMITH, KJ SKELTON, HG WAGNER, KF AF STASHOWER, ME YEAGER, JK SMITH, KJ SKELTON, HG WAGNER, KF TI CIMETIDINE AS THERAPY FOR TREATMENT-RESISTANT PSORIASIS IN A PATIENT WITH ACQUIRED-IMMUNODEFICIENCY-SYNDROME SO ARCHIVES OF DERMATOLOGY LA English DT Article ID EPIDERMAL LANGERHANS CELLS; HISTAMINE; CYCLOSPORIN; IMMUNE C1 USA,WALTER REED ARMY INST RES,WASHINGTON,DC 20310. USN,ARMED FORCES INST PATHOL,WASHINGTON,DC 20350. HENRY M JACKSON FDN,ROCKVILLE,MD. RP STASHOWER, ME (reprint author), USN,NATL NAVAL MED CTR,BETHESDA,MD 20814, USA. NR 24 TC 5 Z9 5 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-987X J9 ARCH DERMATOL JI Arch. Dermatol. PD JUL PY 1993 VL 129 IS 7 BP 848 EP 850 PG 3 WC Dermatology SC Dermatology GA LM091 UT WOS:A1993LM09100003 PM 8323304 ER PT J AU COHEN, ME MEYER, DM AF COHEN, ME MEYER, DM TI EFFECT OF DIETARY VITAMIN-E SUPPLEMENTATION AND ROTATIONAL STRESS ON ALVEOLAR BONE LOSS IN RICE RATS SO ARCHIVES OF ORAL BIOLOGY LA English DT Article DE ALVEOLAR BONE LOSS; VITAMIN-E; STRESS; PSYCHOLOGICAL ID IMMUNE; DISEASE AB The effect of this supplementation on bone loss (distance from the cementum-enamel junction to the alveolar crest measured at the midline of the lingual aspect of each of the mandibular molar roots) was studied in rats that were either not stressed or stressed on a rotational device for 90 days. In the first study, neither vitamin E nor stress condition had statistically significant effects but there was substantial bone loss and bone-loss variability in all groups. Before the start of the second study, to reduce differences in bone loss that might otherwise exist before introduction of the treatments, rats received an antibiotic in their drinking water. In addition, rotational stress was introduced more abruptly than in the first study to reduce the likelihood of adaptation. Bone loss and bone-loss variability were substantially reduced in the second study. Analysis of these data indicated that vitamin E supplementation had a statistically significant protective effect, which was most pronounced at sites most susceptible to loss. Stressed subjects tended to lose more bone, but this effect was not significant. These findings suggest some role for vitamin E supplementation in the maintenance of periodontal health but also a sensitivity in this effect to initial periodontal status. RP COHEN, ME (reprint author), USN,DENT RES INST,BLDG 1-H,GREAT LAKES,IL 60088, USA. NR 45 TC 29 Z9 30 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0003-9969 J9 ARCH ORAL BIOL JI Arch. Oral Biol. PD JUL PY 1993 VL 38 IS 7 BP 601 EP 606 DI 10.1016/0003-9969(93)90126-7 PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LN336 UT WOS:A1993LN33600009 PM 8368957 ER PT J AU GUETTER, HH AF GUETTER, HH TI PHOTOMETRIC-STUDY OF THE OLD GALACTIC CLUSTER BE-31 SO ASTRONOMICAL JOURNAL LA English DT Article ID DEEP CCD PHOTOMETRY; GLOBULAR-CLUSTERS; STARS AB CCD photometry on the Johnson UBV and on the Kron-Cousins VI systems are presented for 732 stars in and near Be 31, an open cluster located-towards the galactic anticenter. The resultant color-magnitude diagrams indicate that the cluster is an old object. From the color-color diagram, the reddening and metallicity parameters are determined to be E(B-V) = 0.13 mag and [Fe/H]= -0.4. By comparing the cluster C-M diagrams with the VandenBerg isochrones, and by assuming a normal reddening law, distance of 5.2+/-0.5 kpc and an age of 8 Gyr are derived. RP GUETTER, HH (reprint author), USN OBSERV,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 23 TC 9 Z9 9 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 1993 VL 106 IS 1 BP 220 EP & DI 10.1086/116629 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ882 UT WOS:A1993LJ88200016 ER PT J AU ELIAS, NM GUDEL, M AF ELIAS, NM GUDEL, M TI RADIO OBSERVATIONS OF PECULIAR EMISSION-LINE ALGOL BINARY STARS SO ASTRONOMICAL JOURNAL LA English DT Article ID BETA-LYRAE AB Twelve peculiar emission-line Algol (PELA) binaries were observed at cm wavelengths. Six of these objects, WW And (tentative), KX And, AM Aur, V644 Mon, DN Ori, and AY Per were detected at the approximately 100 to 400 muJy level, corresponding to luminosity densities of order 10(17) erg s - 1 Hz - 1. These luminosity densities, combined with nearly flat cm spectra and high brightness temperatures (greater than or similar to 10(6) K, assuming emission region radii less than or similar 1 AU), are consistent with the nonthermal gyrosynchrotron radiation model proposed as the result of observations from the previous PELA survey. Also, the star V367 Cyg (a PELA from the previous survey) was reobserved at thirteen different orbital phases; no variability was found within the errors. V367 Cyg's lack of variability and well-determined average spectral index (almost-equal-to +0.6), however, imply the possibility of a different emission mechanism, thermal bremsstrahlung, although the nonthermal model cannot be entirely ruled out. The characteristic brightness temperature of thermal bremsstrahlung is only approximately 10(4) K, which means that the radius of the emission region would have to be much larger than previously assumed, approximately 10 AU. Suggestions for further observations of all previously observed PELAS are presented in order to determine the correct emission mechanism. C1 UNIV COLORADO,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309. RP ELIAS, NM (reprint author), USN OBSERV,DEPT ASTROMETRY,DIV INTERFEROMETRY,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. RI Guedel, Manuel/C-8486-2015 OI Guedel, Manuel/0000-0001-9818-0588 NR 27 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 0004-6256 J9 ASTRON J JI Astron. J. PD JUL PY 1993 VL 106 IS 1 BP 337 EP 341 DI 10.1086/116641 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ882 UT WOS:A1993LJ88200028 ER PT J AU JONES, TJ HUMPHREYS, RM GEHRZ, RD LAWRENCE, GF ZICKGRAF, FJ MOSELEY, H CASEY, S GLACCUM, WJ KOCH, CJ PINA, R JONES, B VENN, K STAHL, O STARRFIELD, SG AF JONES, TJ HUMPHREYS, RM GEHRZ, RD LAWRENCE, GF ZICKGRAF, FJ MOSELEY, H CASEY, S GLACCUM, WJ KOCH, CJ PINA, R JONES, B VENN, K STAHL, O STARRFIELD, SG TI IRC +10420 - A COOL HYPERGIANT NEAR THE TOP OF THE H-R DIAGRAM SO ASTROPHYSICAL JOURNAL LA English DT Article DE POLARIZATION; STARS, EVOLUTION; STARS, INDIVIDUAL (IRC + 10420); STARS, SUPERGIANTS ID INFRARED SPECKLE INTERFEROMETRY; MASS-LOSS RATES; WAVELENGTH DEPENDENCE; EVOLVED STARS; OH/IR STARS; DUST SHELLS; OH MASERS; M-GIANTS; POLARIMETRY; MICRONS AB New data are reported for the OH/IR star IRC + 10420, including optical/infrared imaging, spectroscopy, polarimetry, and photometry. We conclude the following: 1. The optical spectrum is that of a very luminous F supergiant (F Ia+) with a very strong O I blend at 7774 angstrom. Halpha is strongly in emission and shows a double-peaked profile similar to the emission seen in stars with rotating equatorial disks. 2. The optical image taken through polarizing filters is elongated, and shows that the star must be intrinsically polarized at a position angle near 90-degrees. The 8.7 mum image is also elongated, but at a position angle near 150-degrees. 3. The optical/infrared polarization is composed of a strong interstellar component and a complex intrinsic component. The intrinsic position angle in the optical is about 100-degrees, but rotates to about 140-degrees in the infrared. 4. Analysis of the infrared polarization, the reddening of the optical energy distribution, and the stellar radial velocity determined from the optical spectrum indicates that IRC +10420 is at a distance of 4-6 kpc. The resulting luminosity of the star is M(bol) = -9.6 +/- 0.5 mag (5 kpc), near the top of the H-R diagram at or just below the Humphreys-Davidson limit. 5. There has been a decline in the flux from the 1-7 mum continuum from the mid-1970s to the mid-1980s, whereas the optical energy distribution and the 10 mum silicate feature have remained largely unchanged over the same time period. We propose a model for IRC +10420 in which a true core-burning supergiant is surrounded by a rotating equatorial disk of gas and dust that is viewed from about midway above the plane. Dissipation of dust near the star is responsible for the drop in the infrared continuum. The polarization and OH emission are caused by a complex distribution of gas and dust that surrounds the star and its disk from an earlier phase of evolution. IRC +10420 may be evolving from a red supergiant to the blue side of the H-R diagram, perhaps to become a Wolf-Rayet star. We argue that it is now in a phase of evolution that is analogous to that of degenerate core giants evolving through the proto-planetary nebula phase, but at a much higher luminosity. C1 LANDESSTERNWARTE KONIGSTUHL,W-6900 HEIDELBERG 1,GERMANY. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & ASTROPHYS LAB,GREENBELT,MD 20771. USN,RES LAB,DIV SPACE SCI,WASHINGTON,DC 20375. UNIV CALIF SAN DIEGO,CTR ASTROPHYS & SPACE SCI,LA JOLLA,CA 92093. ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287. RP JONES, TJ (reprint author), UNIV MINNESOTA,DEPT ASTRON,116 CHURCH ST,MINNEAPOLIS,MN 55455, USA. NR 73 TC 95 Z9 97 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 JUL 1 PY 1993 VL 411 IS 1 BP 323 EP 335 DI 10.1086/172832 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LH604 UT WOS:A1993LH60400031 ER PT J AU DOSCHEK, GA FEIBELMAN, WA AF DOSCHEK, GA FEIBELMAN, WA TI AN IMPROVED ULTRAVIOLET SPECTRAL-LINE LIST FOR THE SYMBIOTIC STAR RR-TELESCOPII SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE BINARIES, SYMBIOTIC; LINE, IDENTIFICATIONS; STARS, INDIVIDUAL (RR-TEL); ULTRAVIOLET, STARS ID TEL AB We have remeasured wavelengths and intensities of International Ultraviolet Explorer (IUE) spectra of the symbiotic star, RR Tel. The main work is centered on the long 820 minute exposure high-resolution spectrum obtained on 1983 June 18. The list is intended to serve as a source of improved intensities and wavelengths for the ultraviolet spectrum of this star. A complete line list with intensities based on this exposure has not been published previously. The strongest spectral lines are saturated in the 820 minute exposure, and intensities for these lines are mostly obtained from a 20 minute exposure obtained on the same day. A few intensities are obtained from other exposures if neither the 820 nor the 20 minute exposure is satisfactory. There are 111 lines in our list between 1168 and 1980 angstrom. Some of the very weakest lines may not be real. These are indicated by question marks. We also discuss some of the plasma diagnostics available using spectral tines of O V and O IV. C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. RP DOSCHEK, GA (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 8 TC 26 Z9 26 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 1993 VL 87 IS 1 BP 331 EP 336 DI 10.1086/191806 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LJ017 UT WOS:A1993LJ01700010 ER PT J AU KELLER, SL BEZRUKOV, SM GRUNER, SM TATE, MW VODYANOY, I PARSEGIAN, VA AF KELLER, SL BEZRUKOV, SM GRUNER, SM TATE, MW VODYANOY, I PARSEGIAN, VA TI PROBABILITY OF ALAMETHICIN CONDUCTANCE STATES VARIES WITH NONLAMELLAR TENDENCY OF BILAYER PHOSPHOLIPIDS SO BIOPHYSICAL JOURNAL LA English DT Note ID BLACK LIPID-MEMBRANES; INTRINSIC CURVATURE; PHASE; CHANNELS; TRANSITIONS; BEHAVIOR; PACKING AB With few exceptions, membrane lipids are usually regarded as a kind of filler or passive solvent for membrane proteins. Yet, cells exquisitely control membrane composition. Many phospholipids found in plasma membrane bilayers favor packing into inverted hexagonal bulk phases. It was suggested that the strain of forcing such lipids into a bilayer may affect membrane protein function, such as the operation of transmembrane channels. To investigate this, we have inserted the peptide alamethicin into bilayer membranes composed of lipids of empirically determined inverted hexagonal phase ''spontaneous radii'' Ro, which will have expectably different degrees of strain when forced into bilayer form. We observe a correlation between measured Ro and the relative probabilities of different conductance states. States of higher conductance are more probable in dioleoylphosphatidylethanolamine, the lipid of highest curvature, 1/Ro, than in dioleoylphosphatidylcholine, the lipid of lowest curvature. C1 NIH,BLDG 10,ROOM 9B-07,BETHESDA,MD 20892. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. RUSSIAN ACAD SCI,ST PETERSBURG NUCL PHYS INST,MOSCOW 188350,RUSSIA. OFF NAVAL RES,ARLINGTON,VA 22217. RI Gruner, Sol/G-2924-2010 OI Gruner, Sol/0000-0002-1171-4426 FU NIGMS NIH HHS [GM32614] NR 33 TC 214 Z9 217 U1 1 U2 7 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD JUL PY 1993 VL 65 IS 1 BP 23 EP 27 PG 5 WC Biophysics SC Biophysics GA LL137 UT WOS:A1993LL13700011 PM 8369434 ER PT J AU BLECK, R BLUESTEIN, H BOSART, L BRACKEN, WE CARLSON, T CHAPMAN, J DICKINSON, M GYAKUM, JR HAKIM, G HOFFMAN, E ISKENDERIAN, H KEYSER, D LACKMANN, G NUSS, W ROEBBER, P SANDERS, F SCHULTZ, D TYLE, K ZWACK, P AF BLECK, R BLUESTEIN, H BOSART, L BRACKEN, WE CARLSON, T CHAPMAN, J DICKINSON, M GYAKUM, JR HAKIM, G HOFFMAN, E ISKENDERIAN, H KEYSER, D LACKMANN, G NUSS, W ROEBBER, P SANDERS, F SCHULTZ, D TYLE, K ZWACK, P TI 8TH CYCLONE WORKSHOP SCIENTIFIC SUMMARY, VAL-MORIN, QUEBEC, CANADA, 12-16 OCTOBER 1992 SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Editorial Material AB The Eighth Cyclone Workshop was held at the Far Hills Inn and Conference Center in Val Morin, Quebec, Canada, 12-16 October 1992. The workshop was arranged around several scientific themes of current research interest. The most widely debated theme was the applicability of ''potential vorticity thinking'' to theoretical, observational, and numerical studies of the life cycle of cyclones and the interaction of these cyclones with their environment on ail spatial and temporal scales. A combination of invited and contributed talks, with preference given to younger scientists, made up the workshop. C1 SUNY Albany, DEPT ATMOSPHER SCI, ALBANY, NY 12222 USA. PENN STATE UNIV, DEPT METEOROL, UNIV PK, PA 16802 USA. MCGILL UNIV, DEPT ATMOSPHER & OCEAN SCI, MONTREAL H3A 2T5, QUEBEC, CANADA. UNIV QUEBEC, DEPT PHYS, MONTREAL H3C 3P8, QUEBEC, CANADA. UNIV OKLAHOMA, SCH METEOROL, NORMAN, OK 73019 USA. USN, POSTGRAD SCH, DEPT METEOROL, MONTEREY, CA 93940 USA. RP BLECK, R (reprint author), UNIV MIAMI, ROSENSTIEL SCH MARINE & ATMOSPHER SCI, MIAMI, FL 33149 USA. RI Schultz, David M./A-3091-2010 OI Schultz, David M./0000-0003-1558-6975 NR 7 TC 0 Z9 0 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD JUL PY 1993 VL 74 IS 7 BP 1361 EP 1373 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LP292 UT WOS:A1993LP29200007 ER PT J AU DEVIETTI, TL DANDREA, JA HATCHER, DJ REDDIX, MD AF DEVIETTI, TL DANDREA, JA HATCHER, DJ REDDIX, MD TI A TRAINING PROCEDURE FOR OBTAINING CONTRAST-SENSITIVITY FUNCTIONS WITHIN A SINGLE SESSION IN MONKEYS SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Article AB The present paper describes a training procedure that can be used to obtain contrast-sensitivity functions in a single session with monkeys (Macaca mulatta). Examples of these functions, obtained early in the testing phase of the procedure, are presented. For comparison, the functions obtained from several human volunteers performing the same procedure are also shown. The resulting methodology is versatile enough to use in a variety of sensory systems with only minor modifications. C1 USN,AEROSP MED RES LAB,41 HOVEY RD,PENSACOLA,FL 32508. CENT WASHINGTON UNIV,ELLENSBURG,WA 98926. NR 20 TC 1 Z9 1 U1 0 U2 0 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD JUL PY 1993 VL 31 IS 4 BP 245 EP 248 PG 4 WC Psychology, Mathematical SC Psychology GA LM855 UT WOS:A1993LM85500002 ER PT J AU OHSAKI, Y YANG, HK LE, PT JENSEN, RT JOHNSON, BE AF OHSAKI, Y YANG, HK LE, PT JENSEN, RT JOHNSON, BE TI HUMAN SMALL-CELL LUNG-CANCER CELL-LINES EXPRESS FUNCTIONAL ATRIAL-NATRIURETIC-PEPTIDE RECEPTORS SO CANCER RESEARCH LA English DT Article ID BOMBESIN-LIKE PEPTIDES; SMOOTH-MUSCLE CELLS; SWISS 3T3 CELLS; GROWTH FACTOR-I; GUANYLATE-CYCLASE; CLEARANCE RECEPTOR; DNA-SYNTHESIS; TUMOR-CELLS; HELA-CELLS; STIMULATION AB Small cell lung cancer cell (SCLC) lines, NCI-H82, NCI-H660, and NCI-H1284, and HeLa cells were analyzed for the presence of atrial natriuretic peptide (ANP) receptors. In these SCLC cell lines and HeLa cells, ANP A receptor mRNA was identified by Southern blot analyses or polymerase chain reaction products and RNase protection assays using poly(A)+-selected RNA. Saturable binding assays revealed that HeLa cells had 2000 to 5000 high affinity atrial natriuretic peptide receptors per cell with a dissociation constant of 140 pM. In the SCLC cell lines, the binding was saturable but too low to accurately estimate the number of binding sites. After addition of human ANP, radioimmunoassays revealed accumulation of cyclic GMP in SCLC cells as well as HeLa cells in a dose-dependent fashion. The half-maximal stimulation concentration of cyclic GMP accumulation in HeLa and these SCLC cell lines was approximately 2 nM. Tetrazolyl blue assays and tritiated thymidine incorporation did not show any remarkable growth inhibition or growth stimulation of SCLC cell lines after addition of human ANP up to 3.3 muM, more than 1000-fold greater than the half-maximal stimulation concentration of cyclic GMP accumulation. Our results indicate that human SCLC cells express functional ANP receptors but ANP addition produced no detectable change in their growth pattern. C1 NCI,NATL NAVAL MED CTR,NCI USN,MED ONCOL BRANCH,BETHESDA,MD 20889. NIDDKD,DIGEST DIS BRANCH,BETHESDA,MD 20889. RI Yang, Han-Kwang/J-2767-2012 NR 53 TC 13 Z9 13 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD JUL 1 PY 1993 VL 53 IS 13 BP 3165 EP 3171 PG 7 WC Oncology SC Oncology GA LL131 UT WOS:A1993LL13100042 PM 8391389 ER PT J AU GEDRIDGE, RW LEE, KE LOWEMA, C AF GEDRIDGE, RW LEE, KE LOWEMA, C TI LOW-TEMPERATURE CHEMICAL-VAPOR-DEPOSITION OF SB FILMS USING (I-PR)2SBH SO CHEMISTRY OF MATERIALS LA English DT Article ID PHASE EPITAXY; DECOMPOSITION MECHANISMS; INSB; TRIISOPROPYLANTIMONY; GROWTH; TERTIARYBUTYLDIMETHYLANTIMONY; TRIMETHYLINDIUM; INAS1-XSBX; PRECURSOR; MOCVD AB The new precursor diisopropylantimony hydride, (i-Pr)2SbH, was prepared by reaction of (i-Pr)2SbBr with LiAlH4 in diethyl ether and subsequently evaluated for use as a volatile Sb-source compound in the low-temperature organometallic vapor-phase epitaxial film growth of Sb-containing semiconductor materials. (i-Pr)2SbH, an extremely photosensitive volatile liquid, was used in an atmospheric pressure chemical vapor deposition reactor to grow polycrystalline Sb films on Si(100) and Si(111) substrates at temperatures as low as 200-degrees-C. X-ray diffraction data indicated that the resulting Sb films were oriented in the [000L] direction. H-2 and Ar were used as carrier gases and the pyrolysis products were monitored by a residual gas analyzer. The Sb films were characterized by Auger electron spectroscopy and X-ray diffraction. RP GEDRIDGE, RW (reprint author), USN,CTR AIR WARFARE,DEPT RES,DIV CHEM,DIV WEAPONS,CHINA LAKE,CA 93555, USA. NR 28 TC 3 Z9 3 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD JUL PY 1993 VL 5 IS 7 BP 979 EP 982 DI 10.1021/cm00031a017 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA LN594 UT WOS:A1993LN59400017 ER PT J AU SPRITZER, CE NORCONK, JJ SOSTMAN, HD COLEMAN, RE AF SPRITZER, CE NORCONK, JJ SOSTMAN, HD COLEMAN, RE TI DETECTION OF DEEP VENOUS THROMBOSIS BY MAGNETIC-RESONANCE-IMAGING SO CHEST LA English DT Article ID VEIN THROMBOSIS; IMPEDANCE PLETHYSMOGRAPHY; CONTRAST VENOGRAPHY; RADIONUCLIDE VENOGRAPHY; PERFUSION SCINTIGRAMS; CLINICAL OUTCOMES; COMPRESSION US; DIAGNOSIS; LEG; THROMBOPHLEBITIS AB Objective: To determine the accuracy of gradient recalled echo magnetic resonance imaging in assessing deep venous thrombosis. Design: This is a retrospective review of a prospective clinical experience in 216 consecutive patients studied using gradient recalled echo magnetic resonance imaging. Sixteen patients were unavailable for follow-up and 1 study was technically suboptimal, leaving 199 studies as the basis of this report. Results: In 79 cases with confirmatory venography (n = 54), ultrasound (n = 16, thigh veins only), or computed tomography (n = 9, pelvic veins only), magnetic resonance imaging was 97 percent sensitive, 95 percent specific, and 96 percent accurate. Including cases that were normal by magnetic resonance imaging, not anticoagulated, and with uneventful follow-up as true normal cases, the corresponding sensitivity, specificity, and accuracy of magnetic resonance imaging were as follows: 97 percent, 98 percent, and 97 percent. Conclusion: Magnetic resonance imaging, using gradient recalled echo acquisitions, is capable of accurately diagnosing acute deep venous thrombosis. C1 USN HOSP,DEPT RADIOL,PORTSMOUTH,VA. RP SPRITZER, CE (reprint author), DUKE UNIV,MED CTR,DEPT RADIOL,DURHAM,NC 27710, USA. NR 49 TC 74 Z9 77 U1 0 U2 0 PU AMER COLL CHEST PHYSICIANS PI NORTHBROOK PA 3300 DUNDEE ROAD, NORTHBROOK, IL 60062-2348 SN 0012-3692 J9 CHEST JI Chest PD JUL PY 1993 VL 104 IS 1 BP 54 EP 60 DI 10.1378/chest.104.1.54 PG 7 WC Critical Care Medicine; Respiratory System SC General & Internal Medicine; Respiratory System GA LL901 UT WOS:A1993LL90100013 PM 8325117 ER PT J AU WAECKER, NJ ASCHER, DP ROBB, ML MORIARTY, R KORBER, M RICKMAN, WJ BUTZIN, CA FISCHER, GW KUSKIE, M VINCENT, J GOLDBERG, D OTTOLINI, M CIESLAK, T HEMMING, V AF WAECKER, NJ ASCHER, DP ROBB, ML MORIARTY, R KORBER, M RICKMAN, WJ BUTZIN, CA FISCHER, GW KUSKIE, M VINCENT, J GOLDBERG, D OTTOLINI, M CIESLAK, T HEMMING, V TI AGE-ADJUSTED CD4+ LYMPHOCYTE PARAMETERS IN HEALTHY-CHILDREN AT RISK FOR INFECTION WITH THE HUMAN-IMMUNODEFICIENCY-VIRUS SO CLINICAL INFECTIOUS DISEASES LA English DT Note AB Values for CD4+ lymphocytes are reported to vary by age. We evaluated an ethnically diverse population of healthy children at risk for human immunodeficiency virus infection to establish normal ranges for age-adjusted CD4+ lymphocyte parameters. We identified a threshold of approximately 30% CD4+ lymphocytes which corresponded to a 5th percentile for all ages. It is important that no significant differences in absolute CD4+ lymphocyte counts on the basis of ethnic group were found. C1 USN HOSP, DEPT PEDIAT, SAN DIEGO, CA 92134 USA. WILFORD HALL USAF MED CTR, SAN ANTONIO, TX USA. NATL NAVAL MED CTR, BETHESDA, MD 20814 USA. MADIGAN ARMY MED CTR, TACOMA, WA 98431 USA. UNIFORMED SERV UNIV HLTH SCI, BETHESDA, MD 20814 USA. RP WAECKER, NJ (reprint author), USN HOSP, DEPT CLIN INVEST, SAN DIEGO, CA 92134 USA. NR 9 TC 18 Z9 18 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD JUL PY 1993 VL 17 IS 1 BP 123 EP 125 PG 3 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LJ749 UT WOS:A1993LJ74900022 PM 8102556 ER PT J AU CHURCH, JC THORNTON, EB AF CHURCH, JC THORNTON, EB TI EFFECTS OF BREAKING WAVE-INDUCED TURBULENCE WITHIN A LONGSHORE-CURRENT MODEL SO COASTAL ENGINEERING LA English DT Article ID INCIDENT SEA WAVES; SURF ZONE; FIELD DATA AB A longshore current model which includes a modification of the bottom stress term due to the effects of breaking-wave induced turbulence is developed and applied to field data from both barred and planar beaches. This turbulence is postulated as producing a vertical mixing which alters the near-bottom vertical profile of the longshore current. As a result, the bottom fiction coefficient, c(f), used to relate the free stream current velocity to the bottom stress is modeled as consisting of two components, c(fl), a spatially constant value which is assumed to be related to bottom characteristics and c(fr), which is dependent upon breaking-wave induced near-bottom turbulence levels. Employing a one-dimensional turbulent kinetic energy equation to model this breaking-wave induced turbulence, a spatially varying bottom friction coefficient is obtained. The spatially constant c(fl) is estimated based on data taken seaward of the surf zone, where the wind stress is assumed to be balanced by the bottom stress. The concept is demonstrated without the inclusion of horizontal mixing in the longshore current model formulation. The model predicted cross-shore profiles of longshore current show improved agreement with observations compared with treatments using constant c(f) values. C1 USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. NR 32 TC 86 Z9 89 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3839 J9 COAST ENG JI Coast. Eng. PD JUL PY 1993 VL 20 IS 1-2 BP 1 EP 28 DI 10.1016/0378-3839(93)90053-B PG 28 WC Engineering, Civil; Engineering, Ocean SC Engineering GA LU142 UT WOS:A1993LU14200001 ER PT J AU JACOB, RJK AF JACOB, RJK TI WHAT YOU LOOK AT IS WHAT YOU GET SO COMPUTER LA English DT Article RP JACOB, RJK (reprint author), USN,RES LAB,HUMAN COMP INTERACT LAB,CODE 5530,WASHINGTON,DC 20375, USA. NR 6 TC 30 Z9 31 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 JUL PY 1993 VL 26 IS 7 BP 65 EP 66 DI 10.1109/MC.1993.274943 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA LL904 UT WOS:A1993LL90400007 ER PT J AU ZYDA, MJ WILSON, KP PRATT, DR MONAHAN, JG FALBY, JS AF ZYDA, MJ WILSON, KP PRATT, DR MONAHAN, JG FALBY, JS TI NPSOFF - AN OBJECT DESCRIPTION LANGUAGE FOR SUPPORTING VIRTUAL WORLD CONSTRUCTION SO COMPUTERS & GRAPHICS LA English DT Article AB The development of interesting virtual world systems requires the modeling of many different, usually complex, graphical objects. How these objects are represented in the system plays a major part in determining the capabilities of the system. We present an efficient, flexible, and extensible object description language used in virtual world system development at the Naval Postgraduate School. RP ZYDA, MJ (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0097-8493 J9 COMPUT GRAPH JI Comput. Graph. PD JUL-AUG PY 1993 VL 17 IS 4 BP 457 EP 464 DI 10.1016/0097-8493(93)90035-8 PG 8 WC Computer Science, Software Engineering SC Computer Science GA LV341 UT WOS:A1993LV34100015 ER PT J AU PRUSACZYK, WK JACOBS, I BOWDEN, T MCLELLAN, TM AF PRUSACZYK, WK JACOBS, I BOWDEN, T MCLELLAN, TM TI A COMPUTATIONAL METHOD FOR DETERMINATION OF THE INDIVIDUAL ANAEROBIC THRESHOLD SO COMPUTERS IN BIOLOGY AND MEDICINE LA English DT Article DE ANAEROBIC THRESHOLD; EXERCISE; INDIVIDUAL ANAEROBIC THRESHOLD; IAT; LACTATE ID LACTATE; RECOVERY AB The individual anaerobic threshold (IAT) has received attention recently in the field of exercise physiology. The IAT is defined as the point during progressive exercise when lactate elimination from the blood is both maximal and equal to the diffusion from the working muscles. It has been theorized that an individual can maintain exercise for relatively long periods when working at the IAT. A common method for determination of the IAT is to perform a visual determination from plots of lactate concentration versus power output. This paper briefly describes the theoretical basis for determination of the IAT and presents an algorithm for its accurate calculation. C1 DEF & CIVIL INST ENVIRONM MED,N YORK M3M 3B9,ON,CANADA. USN,HLTH RES CTR,DIV SPECIAL OPERAT,SAN DIEGO,CA 92186. RP PRUSACZYK, WK (reprint author), GEOCENTERS INC,FT WASHINGTON,MD 20744, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0010-4825 J9 COMPUT BIOL MED JI Comput. Biol. Med. PD JUL PY 1993 VL 23 IS 4 BP 327 EP 331 DI 10.1016/0010-4825(93)90087-H PG 5 WC Biology; Computer Science, Interdisciplinary Applications; Engineering, Biomedical; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Computer Science; Engineering; Mathematical & Computational Biology GA LQ045 UT WOS:A1993LQ04500007 PM 8375156 ER PT J AU KAMEL, NN SONG, T KAMEL, M AF KAMEL, NN SONG, T KAMEL, M TI AN APPROACH FOR BUILDING AN INTEGRATED ENVIRONMENT FOR MOLECULAR-BIOLOGY DATABASES SO DISTRIBUTED AND PARALLEL DATABASES LA English DT Article DE MOLECULAR BIOLOGY; DATABASE INTEGRATION; FEDERATED DATABASES; GRAPHICAL USER INTERFACES AB The requirements of a traditional integration of databases include hiding the heterogeneity among its member databases, preserving their autonomy, supporting controlled data sharing, and providing a user-friendly interface, with a performance comparable to that of a homogeneous distributed database system. In this paper, we describe a variation of the loosely coupled federated database approach that satisfies these requirements and is specifically oriented toward the special characteristics and needs of molecular biology databases. The approach differs from the traditional federated database approach in that it also integrates software tools together with the databases. In addition, the system gives the graphical user interface a more central role in the integration. Thus, the system has all the advantages provided by a visual user environment and is thus more user-friendly than traditional linguistic approaches. The paper also includes a description of XBio, a system which constructs such an integration. The design of XBio ensures robustness and can be customized to the needs of different classes of users. C1 USN, SCH POSTGRAD, DEPT INFORMAT SYST, MONTEREY, CA 93943 USA. RP UNIV FLORIDA, CTR DATABASE SYST RES & DEV, GAINESVILLE, FL 32611 USA. NR 14 TC 2 Z9 2 U1 0 U2 1 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0926-8782 EI 1573-7578 J9 DISTRIB PARALLEL DAT JI Distrib. Parallel Databases PD JUL PY 1993 VL 1 IS 3 BP 303 EP 327 DI 10.1007/BF01263335 PG 25 WC Computer Science, Information Systems; Computer Science, Theory & Methods SC Computer Science GA MN926 UT WOS:A1993MN92600004 ER PT J AU RODIER, GR MORAND, JJ OLSON, JS WATTS, DM SAIDSALAH AF RODIER, GR MORAND, JJ OLSON, JS WATTS, DM SAIDSALAH TI HIV-INFECTION AMONG SECONDARY-SCHOOL STUDENTS IN DJIBOUTI, HORN-OF-AFRICA - KNOWLEDGE, EXPOSURE AND PREVALENCE SO EAST AFRICAN MEDICAL JOURNAL LA English DT Article ID EDUCATION AB A study of HIV infection among secondary school students was conducted in Djibouti in February 1990 during a national hepatitis survey. Serology was negative for HIV and syphilis among 294 students (ages 14 to 20 years) in spite of a dramatic increase of HIV seropositivity (as high as 41%), and a high; level of syphilis positive serology (up to 46%) among adult high-risk groups such as street prostitutes. Results of a face-to-face interview of these pupils indicated that 64% had a basic knowledge of AIDS. As expected, a much better knowledge of AIDS was found among those who recently received AIDS education. However, 80% of secondary school teenagers did not consider themselves at risk for acquiring HIV. Transmission of HIV among school-children would be possible through sexual activity (22% stated to be sexually active) or parenteral therapy (75% had received at least one intramuscular injection), and not likely through blood transfusion or intravenous drug abuse. Results, close to those of a similar study in Zimbabwe, suggest that AIDS education programme should be given to all secondary school pupils and include public health lectures on syphilis, tuberculosis, and HIV infection. C1 UNIV MARYLAND,SCH MED,INT HLTH PROGRAMMES,BALTIMORE,MD. USN,MED RES UNIT 3,VIROL BRANCH,AE 09835 0007,FPO,CAIRO,EGYPT. DJIBOUTI MINIST HLTH,SERV MED SCOLAIRE,DJIBOUTI,DJIBOUTI. RP RODIER, GR (reprint author), USN,MED RES UNIT 3,EPIDEMIOL BRANCH,AE 09835 0007,FPO,CAIRO,EGYPT. NR 10 TC 11 Z9 11 U1 0 U2 2 PU EAST AFRICAN MEDICAL JOURNAL PI NAIROBI PA CHYULU ROAD PO BOX 41632, NAIROBI, KENYA SN 0012-835X J9 E AFR MED J JI East Afr. Med. J. PD JUL PY 1993 VL 70 IS 7 BP 414 EP 417 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA MG695 UT WOS:A1993MG69500005 PM 8293699 ER PT J AU KWON, YW AF KWON, YW TI STUDY OF CRACK CLOSURE IN LAMINATED COMPOSITE SHELLS SO ENGINEERING FRACTURE MECHANICS LA English DT Article ID FINITE-ELEMENT ANALYSIS; PLATE AB Fibrous composite shells containing through-wall-thickness cracks and subjected to bending loads have crack closure at the crack faces under compression. A study was undertaken to determine the effect of crack closure on the displacement and stress fields of a composite shell using the finite element method. Open cylindrical composite shells containing longitudinal center cracks were studied. The shells had unidirectional layers or cross-ply layers. Numerical analyses showed that crack closure could increase or decrease the crack opening displacement and bending stress around the crack tip at the tensile surface of a composite shell compared to those obtained without considering crack closure. Whether crack closure at the compression side increased or decreased the displacement and stress fields at the tension side depended on material properties of composite shells and crack orientation. A large transverse shear flexibility of the crack face caused an increase of crack opening displacement and bending stress at the tensile surface. The effect of crack closure was more significant for a unidirectional composite shell than for a cross-ply composite shell. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 14 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 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD JUL PY 1993 VL 45 IS 5 BP 663 EP 669 DI 10.1016/0013-7944(93)90272-T PG 7 WC Mechanics SC Mechanics GA LP894 UT WOS:A1993LP89400011 ER PT J AU STEIN, LS STEIN, DWJ ECHOLS, J BURGHARDT, RC AF STEIN, LS STEIN, DWJ ECHOLS, J BURGHARDT, RC TI CONCOMITANT ALTERATIONS OF DESMOSOMES, ADHESIVENESS, AND DIFFUSION THROUGH GAP JUNCTION CHANNELS IN A RAT OVARIAN TRANSFORMATION MODEL SYSTEM SO EXPERIMENTAL CELL RESEARCH LA English DT Article ID FLUORESCENCE PHOTOBLEACHING ASSAY; CELL-CELL COMMUNICATION; EPITHELIAL-CELLS; INTERCELLULAR COMMUNICATION; CARCINOMA-CELLS; CANCER; DESMOPLAKIN; EXPRESSION; INHIBITION; FILAMENTS C1 TEXAS A&M UNIV SYST,DEPT VET ANAT & PUBL HLTH,COLL STN,TX 77843. USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152. RP STEIN, LS (reprint author), UNIV CALIF SAN DIEGO,DEPT PEDIAT,M-609A,9500 GILMAN DR,LA JOLLA,CA 92093, USA. OI Burghardt, Robert/0000-0003-1021-8444 FU NICHD NIH HHS [HD26182]; NIDDK NIH HHS [DK07318] NR 40 TC 25 Z9 27 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 0014-4827 J9 EXP CELL RES JI Exp. Cell Res. PD JUL PY 1993 VL 207 IS 1 BP 19 EP 32 DI 10.1006/excr.1993.1158 PG 14 WC Oncology; Cell Biology SC Oncology; Cell Biology GA LK309 UT WOS:A1993LK30900003 PM 8319770 ER PT J AU HEIM, RC WILLINGHAM, G FREED, WJ AF HEIM, RC WILLINGHAM, G FREED, WJ TI A COMPARISON OF SOLID INTRAVENTRICULAR AND DISSOCIATED INTRAPARENCHYMAL FETAL SUBSTANTIA-NIGRA GRAFTS IN A RAT MODEL OF PARKINSONS-DISEASE - IMPAIRED GRAFT-SURVIVAL IS ASSOCIATED WITH HIGH BASE-LINE ROTATIONAL BEHAVIOR SO EXPERIMENTAL NEUROLOGY LA English DT Article ID NIGROSTRIATAL DOPAMINE PATHWAY; DENERVATED STRIATUM; 6-OHDA LESIONS; ADULT-RAT; 6-HYDROXYDOPAMINE LESIONS; MESENCEPHALIC XENOGRAFTS; INTRACEREBRAL DIALYSIS; SYNAPTIC CONNECTIONS; ADRENAL-MEDULLA; CAUDATE-NUCLEUS C1 USN HOSP,DEPT NEUROSURG,BETHESDA,MD 20814. ST ELIZABETH HOSP,NIMH,CTR NEUROSCI,NEUROPSYCHIAT BRANCH,PRECLIN NEUROSCI SECT,WASHINGTON,DC 20032. NR 58 TC 14 Z9 15 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 0014-4886 J9 EXP NEUROL JI Exp. Neurol. PD JUL PY 1993 VL 122 IS 1 BP 5 EP 15 DI 10.1006/exnr.1993.1102 PG 11 WC Neurosciences SC Neurosciences & Neurology GA LR102 UT WOS:A1993LR10200002 PM 8101821 ER PT J AU DOOLITTLE, RD TOLSTOY, A SULLIVAN, EJ AF DOOLITTLE, RD TOLSTOY, A SULLIVAN, EJ TI SPECIAL ISSUE ON DETECTION AND ESTIMATION IN MATCHED-FIELD PROCESSING - GUEST EDITORIAL SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Editorial Material ID LOCALIZATION C1 USN,CTR UNDERSEA WARFARE BASIC RES,WASHINGTON,DC 20350. USN,RES LAB,MATCHED FIELD INVERS SECT,WASHINGTON,DC 20375. RP DOOLITTLE, RD (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 4 TC 4 Z9 5 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1993 VL 18 IS 3 BP 153 EP 155 PG 3 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA LZ422 UT WOS:A1993LZ42200001 ER PT J AU SULLIVAN, EJ MIDDLETON, D AF SULLIVAN, EJ MIDDLETON, D TI ESTIMATION AND DETECTION ISSUES IN MATCHED-FIELD PROCESSING SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID SHALLOW-WATER; SOURCE LOCALIZATION; DEPTH ESTIMATION; SOUND-SPEED; MODE; ENVIRONMENT; RANGE; WAVE; MISMATCH; SIGNALS AB The primary purpose of this paper is to establish a conceptual framework in which the model-based, space-time acoustic signal processing procedure known as matched. field processing (MFP) can be handled in a consistent manner. After a discussion of the history and background of the subject, a framework for strong-signal MFP is developed, based on standard statistical estimation therapy. The point of view is taken that MFP is, at its core, an estimation problem in the strong-signal regime. In the weak-signal cases, the necessary requirement of detection dictates that MFP then be considered a joint detection-estimation task. It is demonstrated that, generally, MFP is essentially a space-time processing problem rather than simply an array processing (spatial processing only) procedure. Following this framework, an overview of the processing schemes used to date in MFP is given in which it is shown how these methods relate to the optimal space-time structure. Weak-signal detection and estimation scenarios relevant to MFP are then noted. A discussion of present methods for dealing with the inherent instability of MFP algorithms (mismatch) is also presented. The final section contains a concise critical summary of the current status of MFP, with some general recommendations for future research. C1 UNIV RHODE ISL,KINGSTON,RI 02881. RP SULLIVAN, EJ (reprint author), USN,CTR UNDERWATER SYST,NEWPORT,RI 02841, USA. NR 64 TC 29 Z9 33 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1993 VL 18 IS 3 BP 156 EP 167 DI 10.1109/JOE.1993.236354 PG 12 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA LZ422 UT WOS:A1993LZ42200002 ER PT J AU CHEN, GC HODGKISS, WS AF CHEN, GC HODGKISS, WS TI VLF SOURCE LOCALIZATION WITH A FREELY DRIFTING ACOUSTIC SENSOR ARRAY SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article DE MATCHED-FIELD PROCESSING; SOURCE LOCALIZATION; FREELY DRIFTING SENSOR ARRAY; ENVIRONMENT ADAPTATION; SIMULATED ANNEALING ID SHALLOW-WATER; RANGE; ENVIRONMENT; DEPTH; NOISE; OCEAN; WAVE AB Source localization and tracking capability of the freely drifting Swallow float volumetric array is demonstrated with matched-field processing (MFP) technique using the 14-Hz cw data collected during the 1989 Swallow float experiment conducted in the northeast Pacific by Marine Physical Laboratory. Initial MFP of the experimental data revealed difficulties in estimating the source depth and-range while the source azimuth estimate was quite successful. The main cause of the MFP performance degradation was incomplete knowledge of the environment. An environment adaptation technique using a global optimization algorithm was developed to alleviate the environmental mismatch problem. With limited knowledge of the environment and a known location of the 14-Hz source during a selected time interval according to the source log, the ocean-acoustic environment can be adapted to the acoustic data in a matched-field sense. Using the adapted environment, the 14-Hz source was successfully localized and tracked in azimuth and range within a region of interest using the MFP technique at a later time interval. Two types of environmental parameters were considered, i.e., sound speed and modal wave number. While both approaches yield similar results, the modal wave number adaptation implementation is more computationally efficient. C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,MARINE PHYS LAB,GRAD DEPT,LA JOLLA,CA 92093. RP CHEN, GC (reprint author), USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,SAN DIEGO,CA 92152, USA. NR 35 TC 10 Z9 10 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1993 VL 18 IS 3 BP 209 EP 223 DI 10.1109/JOE.1993.236359 PG 15 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA LZ422 UT WOS:A1993LZ42200007 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI SOUND-VELOCITY PROFILE ESTIMATION - A SYSTEM-THEORETIC APPROACH SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID SOURCE LOCALIZATION; VERTICAL ARRAY; SHALLOW-WATER AB A system-theoretic approach is proposed to investigate the feasibility of reconstructing a sound velocity profile (SVP) from acoustical hydrophone measurements. This problem is based on a state-space representation of the normal-mode propagation model. It is shown' that this representation can be utilized to investigate the so-called observability of the SVP from noisy measurement data. A model-based processor is developed to extract the required information and it is shown that even in cases where limited SVP information is available, the SVP can be estimated using this approach. Based on this framework, investigations are made, of model-based solutions to the sound velocity profile and related parameter estimation problems. In particular, a processor is designed that allows in situ recursive estimation of the sound velocity profile from simulated data. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,CTR ADV SIGNAL & IMAGE SCI,LIVERMORE,CA 94550, USA. NR 28 TC 21 Z9 23 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1993 VL 18 IS 3 BP 240 EP 252 DI 10.1109/JOE.1993.236362 PG 13 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA LZ422 UT WOS:A1993LZ42200010 ER PT J AU HEALEY, AJ LIENARD, D AF HEALEY, AJ LIENARD, D TI MULTIVARIABLE SLIDING MODE CONTROL FOR AUTONOMOUS DIVING AND STEERING OF UNMANNED UNDERWATER VEHICLES SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID SYSTEMS AB A six degree of freedom model for the maneuvering of an underwater vehicle is used and a sliding mode autopilot is designed for the combined steering, diving, and speed control functions. In flight control applications of this kind, difficulties arise because the system to be controlled is highly nonlinear, coupled, and there is a good deal of parameter uncertainty and variation with operational conditions. The development of variable structure control in the form of sliding modes has been shown to provide robustness that is expected to be quite remarkable for AUV autopilot design. This paper shows that a multivariable sliding mode autopilot based on state feedback, designed assuming decoupled modeling, is quite satisfactory for the combined speed, steering, and diving response of a slow speed AUV. The influence of speed, modeling nonlinearity, uncertainty, and disturbances, can be effectively compensated, even for complex maneuvering. Waypoint acquisition based on line of sight guidance is used to achieve path tracking. RP HEALEY, AJ (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,AUTONOMOUS UNDERWATER VEHICLE PROJECT,MONTEREY,CA 93943, USA. NR 32 TC 365 Z9 388 U1 12 U2 61 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1993 VL 18 IS 3 BP 327 EP 339 DI 10.1109/JOE.1993.236372 PG 13 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA LZ422 UT WOS:A1993LZ42200020 ER PT J AU RUGG, D AF RUGG, D TI USING A CAPABILITY EVALUATION TO SELECT A CONTRACTOR SO IEEE SOFTWARE LA English DT Article RP RUGG, D (reprint author), USN,CTR AIR WARFARE,DIV WEAP,CODE C2146,CHINA LAKE,CA 93555, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0740-7459 J9 IEEE SOFTWARE JI IEEE Softw. PD JUL PY 1993 VL 10 IS 4 BP 36 EP 45 DI 10.1109/52.219632 PG 10 WC Computer Science, Software Engineering SC Computer Science GA LK670 UT WOS:A1993LK67000011 ER PT J AU MOKOLE, EL KNEPP, DL AF MOKOLE, EL KNEPP, DL TI IONOSPHERIC SCINTILLATION-INDUCED INTEGRATION LOSSES FOR SPACE-BASED RADAR SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article ID MUTUAL COHERENCE FUNCTION; ANALYTIC SOLUTION; PROPAGATION; VHF AB An estimate of the impact of very severe ionospheric conditions on the coherent and noncoherent integration process from a two-way, transionospheric, propagation path is obtained for a specific type of frequency-diverse waveform. A bound on the total integration loss that would result from using this waveform during such ionospheric conditions is obtained through the analysis of data from the Wideband satellite experiment. C1 MISSION RES CORP,MONTEREY,CA 93940. RP MOKOLE, EL (reprint author), USN,RES LAB,TARGET CHARACTERIST BRANCH,CODE 5341,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 23 TC 1 Z9 1 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1993 VL 29 IS 3 BP 636 EP 650 DI 10.1109/7.220916 PG 15 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LM176 UT WOS:A1993LM17600003 ER PT J AU GRAY, RL AF GRAY, RL TI A PURE-CARTESIAN FORMULATION FOR TRACKING FILTERS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB A pure-Cartesian formulation is presented for angle-only and angle-plus-range tracking filters. Unlike conventional angle-only filters, which use target elevation and bearing as measurements, the filter expresses the sensor measurements in Cartesian coordinates. Consequently, the filter performs equally well for any line-of-sight geometry, even when target elevation approaches or is equal to +/-90 deg. RP GRAY, RL (reprint author), USN,CTR SURFACE WARFARE,CODE L13U,DAHLGREN,VA 22448, USA. NR 7 TC 6 Z9 8 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 1993 VL 29 IS 3 BP 749 EP 754 DI 10.1109/7.220925 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LM176 UT WOS:A1993LM17600014 ER PT J AU BLAIR, WD AF BLAIR, WD TI FIXED-GAIN 2-STAGE ESTIMATORS FOR TRACKING MANEUVERING TARGETS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB The two-stage alpha-beta-gamma estimator is proposed as an alternative to adaptive gain versions of the alpha, beta and alpha, beta, gamma filters for tracking maneuvering targets. The purpose of this work is to accomplish fixed-gain, variable dimension filtering with a two-stage alpha-beta-gamma estimator. The two-stage alpha-beta-gamma estimator is derived from the two-stage Kalman estimator, and the noise variance reduction matrix and steady-state error covariance matrix are given as a function of the steady-state gains. A procedure for filter parameter selection is also given along with a technique for maneuver response and a gain scheduling technique for initialization. The kinematic constraint for constant speed targets is also incorporated into the two-stage estimator to form the two-stage alpha-beta-gamma-lambda estimator. Simulation results are given for a comparison of the performances of estimators with that of the alpha-beta-gamma filter. RP BLAIR, WD (reprint author), USN,CTR SURFACE WARFARE,CODE B32,DAHLGREN,VA 22448, USA. NR 12 TC 17 Z9 17 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1993 VL 29 IS 3 BP 1004 EP 1014 DI 10.1109/7.220947 PG 11 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LM176 UT WOS:A1993LM17600035 ER PT J AU LERRO, D BARSHALOM, Y AF LERRO, D BARSHALOM, Y TI TRACKING WITH DEBIASED CONSISTENT CONVERTED MEASUREMENTS VERSUS EKF SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB In tracking applications target motion is usually best modeled in a simple fashion using Cartesian coordinates. Unfortunately, in most systems the target position measurements are provided in terms of range and azimuth (bearing) with respect to the sensor location. This situation requires either converting the measurements to a Cartesian frame of reference and working directly on converted measurements or using an extended Kalman filter (EKF) in mixed coordinates. An accurate means of tracking with debiased consistent converted measurements is presented which accurately accounts for the sensor inaccuracies over all practical geometries and accuracies. This method is compared with the mixed coordinates EKF approach as well as a converted measurement approach discussed in [1, 3] which is an acceptable approximation only for moderate cross-range errors. This new approach is shown to be more accurate in terms of position and velocity errors and provides consistent estimates (i.e., compatible with the filter calculated covariances) for all practical situations. The combination of parameters (range, range accuracy, and azimuth accuracy) for which debiasing is needed is presented in explicit form. C1 UNIV CONNECTICUT,ELECT & SYST ENGN,STORRS,CT 06269. RP LERRO, D (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 6 TC 185 Z9 240 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1993 VL 29 IS 3 BP 1015 EP 1022 DI 10.1109/7.220948 PG 8 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LM176 UT WOS:A1993LM17600036 ER PT J AU GRAY, JE MURRAY, W AF GRAY, JE MURRAY, W TI A DERIVATION OF AN ANALYTIC-EXPRESSION FOR THE TRACKING INDEX FOR THE ALPHA-BETA-GAMMA FILTER SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter AB We present a derivation of an analytic expression for the alpha of an alpha-beta-gamma filter in terms of the tracking index. The result permits a direct calculation of alpha from a simple analytic expression instead of using numerical techniques to determine alpha. RP GRAY, JE (reprint author), USN,CTR SURFACE WARFARE,CODE B32,DAHLGREN,VA 22448, USA. NR 6 TC 13 Z9 13 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1993 VL 29 IS 3 BP 1064 EP 1065 DI 10.1109/7.220956 PG 2 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LM176 UT WOS:A1993LM17600045 ER PT J AU HITNEY, HV AF HITNEY, HV TI A PRACTICAL TROPOSPHERIC SCATTER MODEL USING THE PARABOLIC EQUATION SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID WAVE-PROPAGATION AB A simple method is described that accounts for tropospheric scatter using the parabolic equation portion of the radio physical optics (RPO) model. RPO is a hybrid propagation model that combines ray-optics and parabolic-equation methods to assess realistic range-dependent tropospheric effects at frequencies from 100 MHz to 20 GHz. A semiempirical scatter model adds a random refractive-index fluctuation to the mean refractive-index value at each height considered by the parabolic equation method. The results of this scatter model are compared with another scatter model and with a few sample radio measurements. RP HITNEY, HV (reprint author), USN,CTR CONTROL & OCEAN SURVEILLANCE,NAVAL COMMAND,SAN DIEGO,CA 92152, USA. NR 16 TC 14 Z9 20 U1 1 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 JUL PY 1993 VL 41 IS 7 BP 905 EP 909 DI 10.1109/8.237621 PG 5 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LY048 UT WOS:A1993LY04800009 ER PT J AU JENN, DC FLETCHER, JE PRATA, A AF JENN, DC FLETCHER, JE PRATA, A TI RADAR CROSS-SECTION OF SYMMETRICAL PARABOLIC REFLECTORS WITH CAVITY-BACKED DIPOLE FEEDS SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note AB The monostatic radar cross section (RCS) of a symmetric parabolic reflector antenna with a cavity-backed dipole feed is computed using the method of moments. At frequencies below the operating frequency band of the antenna the dipole contribution is not significant; in the operating band the dipole terminal load condition only affects the RCS near boresight. The f/D ratio of the antenna is shown to have a significant effect on the RCS. By adjusting the focal length, the cavity and paraboloid scattering contributions can be made to partially cancel, yielding a reduction in RCS near boresight. C1 USN,ACAD,ANNAPOLIS,MD. UNIV SO CALIF,LOS ANGELES,CA 90089. RP JENN, DC (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD JUL PY 1993 VL 41 IS 7 BP 992 EP 994 DI 10.1109/8.237635 PG 3 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LY048 UT WOS:A1993LY04800023 ER PT J AU ALOUANI, AT BLAIR, WD AF ALOUANI, AT BLAIR, WD TI USE OF A KINEMATIC CONSTRAINT IN TRACKING CONSTANT-SPEED, MANEUVERING TARGETS SO IEEE TRANSACTIONS ON AUTOMATIC CONTROL LA English DT Note AB The use of a kinematic constraint as a pseudomeasurement in the tracking of constant speed, maneuvering targets is considered in this note. The kinematic constraint provides additional information about the target motion that can be processed to improve tracking performance. A new formulation of the constraint equation is presented, and the rationale for the new formulation is discussed. The filter using the kinematic constraint as a pseudomeasurement is shown to be unbiased and sufficient conditions for stochastic stability of the filter are given. Simulated tracking results are given to demonstrate the potential that the new formulation provides for improving tracking performance. C1 USN,CTR SURFACE WARFARE,DEPT SYST RES & TECHNOL,DAHLGREN,VA 22448. RP ALOUANI, AT (reprint author), TENNESSEE TECHNOL UNIV,DEPT ELECT ENGN,COOKEVILLE,TN 38505, USA. NR 11 TC 56 Z9 64 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9286 J9 IEEE T AUTOMAT CONTR JI IEEE Trans. Autom. Control PD JUL PY 1993 VL 38 IS 7 BP 1107 EP 1111 DI 10.1109/9.231465 PG 5 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA LU270 UT WOS:A1993LU27000010 ER PT J AU TEDESCO, C ZANONI, E CANALI, C BIGLIARDI, S MANFREDI, M STREIT, DC ANDERSON, WT AF TEDESCO, C ZANONI, E CANALI, C BIGLIARDI, S MANFREDI, M STREIT, DC ANDERSON, WT TI IMPACT IONIZATION AND LIGHT-EMISSION IN HIGH-POWER PSEUDOMORPHIC ALGAAS/INGAAS HEMTS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID GAAS-MESFETS AB Impact ionization and light emission have been studied in pseudomorphic AlGaAs/InGaAs HEMT's characterized by a delta doping inserted in the undoped AlGaAs layer and by an additional planar doping within the InGaAs channel, suitable for high-power applications. Impact ionization has been demonstrated to be the limiting effect for high V(ds) applications. Emission spectra in the 1.1-2.6 eV range have been analyzed showing peaks at low energy due to recombination mechanisms and a long tail due to hot electrons. C1 UNIV MODENA,FAC INGN,I-41100 MODENA,ITALY. UNIV PARMA,DIPARTIMENTO FIS,I-43100 PARMA,ITALY. TRW CO INC,DIV ELECTR TECHNOL,REDONDO BEACH,CA 90278. USN,RES LAB,WASHINGTON,DC 20375. RP TEDESCO, C (reprint author), UNIV PADUA,DIPARTIMENTO ELETTRON & INFORMAT,I-35131 PADUA,ITALY. NR 12 TC 50 Z9 50 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD JUL PY 1993 VL 40 IS 7 BP 1211 EP 1214 DI 10.1109/16.216423 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA LH050 UT WOS:A1993LH05000003 ER PT J AU Burl, JB AF Burl, Jeff B. TI A reduced order extended Kalman filter for sequential images containing a moving object SO IEEE TRANSACTIONS ON IMAGE PROCESSING LA English DT Article AB The extended Kalman filter (EKF) is applied to the reduction of noise in sequential images containing a moving object and to the estimation of the object's velocity. A computationally tractable approximation of the EKF, called the parallel extended Kalman filter (PEKF), is generated. The PEKF consists of a parallel bank of third order EKF's, operating on the Fourier coefficients of the image, followed by a finite impulse response filter. The PEKF is shown to converge to the optimal (in the mean square sense) algorithm in the limit as the velocity estimation errors approach zero. The performance of the PEKF is demonstrated for very low signal-to-noise ratio (SNR) images. The PEKF also provides a natural setting for tracking slow changes in the object (real or apparent) and its velocity, since these variations are included in the model. The relation of the PEKF to another frequency domain algorithm for velocity estimation is discussed. The algorithm is illustrated by application to an example and the performance demonstrated in the presence of velocity estimation errors. C1 Naval Postgrad Sch, Dept Elect & Comp Engn, Monterey, CA 93943 USA. RP Burl, JB (reprint author), Naval Postgrad Sch, Dept Elect & Comp Engn, Monterey, CA 93943 USA. NR 32 TC 18 Z9 19 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 1057-7149 J9 IEEE T IMAGE PROCESS JI IEEE Trans. Image Process. PD JUL PY 1993 VL 2 IS 3 BP 285 EP 295 DI 10.1109/83.236537 PG 11 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA V43UW UT WOS:000202961000001 PM 18296218 ER PT J AU Soni, T Zeidler, JR Ku, WH AF Soni, Tarun Zeidler, James R. Ku, Walter H. TI Performance evaluation of 2-D adaptive prediction filters for detection of small objects in image data SO IEEE TRANSACTIONS ON IMAGE PROCESSING LA English DT Article AB This paper studies the performance of two dimensional least mean square (TDLMS) adaptive filters as prewhitening filters for the detection of small objects in image data. The object of interest is assumed to have a very small spatial spread and is obscured by correlated clutter of much larger spatial extent. The correlated clutter is predicted and subtracted from the input signal, leaving components of the spatially small signal in the residual output. The receiver operating characteristics of a detection system augmented by a TDLMS prewhitening filter are plotted using Monte-Carlo techniques. It is shown that such a detector has better operating characteristics than a conventional matched filter in the presence of correlated clutter. For very low signal-to-background ratios, TDLMS-based detection systems show a considerable reduction in the number of false alarms. The output energy in both the residual and prediction channels of such filters is shown to be dependent on the correlation length of the various components in the input signal. False alarm reduction and detection gains obtained by using this detection scheme on thermal infrared sensor data with known object positions is presented. C1 Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA. USN, Command,Control & Ocean Surveillance Ctr, RDT&E Div, San Diego, CA 92152 USA. RP Soni, T (reprint author), Univ Calif San Diego, Dept Elect & Comp Engn, La Jolla, CA 92093 USA. NR 31 TC 94 Z9 109 U1 2 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855 USA SN 1057-7149 J9 IEEE T IMAGE PROCESS JI IEEE Trans. Image Process. PD JUL PY 1993 VL 2 IS 3 BP 327 EP 340 DI 10.1109/83.236534 PG 14 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA V43UW UT WOS:000202961000004 PM 18296221 ER PT J AU SCHULTZ, A AF SCHULTZ, A TI COLLECTIVE RECALL VIA THE BRAIN-STATE-IN-A-BOX NETWORK SO IEEE TRANSACTIONS ON NEURAL NETWORKS LA English DT Article AB A number of approaches to pattern recognition employ variants of nearest neighbor recall. This procedure can be described as using a number of prototypes of known class and identifying an unknown pattern vector according to the prototype it is nearest to. A recall criterion of this type that depends on the relation of the unknown to a single prototype is a non-smooth function and leads to a decision boundary that is a jagged, piecewise linear hypersurface. Decision boundaries generated by k-nearest neighbors also have this property. This paper develops a pattern recognition method based on a smooth nearness measure of the unknown to all the prototypes and is called ''collective recall.'' The prototypes are represented as cells in a brain-state-in-a-box (BSB) network. Cells that represent the same pattern class are linked by positive weights and cells representing different pattern classes are linked by negative weights. The initial state of the network is a vector whose components are measures of nearness of the unknown pattern vector to each of the prototypes. Competing coalitions of cells drive the network to a vertex point of the BSB. This final state of the network classifies the unknown and is one in which all the prototypes associated with a class are ''turned on'' and with all other cells ''turned off.'' A new version of the BSB is introduced that has an attractor at the origin. Pattern vectors that lie near the boundary of two pattern classes tend to converge to this attractor and by deleting these ''undecided cases'' one can get a significant improvement in performance for a relatively small fraction of undecided cases. Analytic solutions to the BSB eigenvalue problem are obtained and allows one to select weights that generate flows that are hyperbolic. Computer simulations of collective recall used in conjunction with learning vector quantization (LVQ) shows significant improvement in performance relative to nearest neighbor recall for pattern classes defined by nonspherically symmetric Gaussians. RP SCHULTZ, A (reprint author), USN,RES LAB,DIV RADAR,WASHINGTON,DC 20375, USA. NR 9 TC 17 Z9 17 U1 2 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1045-9227 J9 IEEE T NEURAL NETWOR JI IEEE Trans. Neural Netw. PD JUL PY 1993 VL 4 IS 4 BP 580 EP 587 DI 10.1109/72.238313 PG 8 WC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LZ807 UT WOS:A1993LZ80700004 PM 18267759 ER PT J AU METERSKY, ML AF METERSKY, ML TI A DECISION-ORIENTED APPROACH TO SYSTEM-DESIGN AND DEVELOPMENT SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article ID COMPUTER AB Design and development of major systems has become an institutionalized, regulated process. Systems, in one form or another, are built to provide input to a decision maker. The decision maker, a major system component, is often neglected in current system design practice. As a result, the systems do not meet pivotal requirements of typical users, and full performance potential is rarely attained when they are deployed into the operational environment. This paper describes a two-phase, decision-oriented process that overcomes many of the system usability problems and unfavorable cost/effectiveness consequences resulting from current design and development processes. The system design and development approach presented combines the use of a unique version of prototyping, a decision-oriented prototype, detailed requirements analysis, strong user involvement and extensive user operational testing throughout design and development. The first phase ends with a user-tested and user-endorsed prototype. This prototype becomes the source of a preliminary system specification that launches the second phase, which includes formal specification development, hardware and software implementation, and predeployment formal usability testing. The intent of this approach is to provide a seamless match between user-centered design and overall system design. RP METERSKY, ML (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,CODE 1033,BOX 5152,WARMINSTER,PA 18974, USA. NR 29 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 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD JUL-AUG PY 1993 VL 23 IS 4 BP 1024 EP 1037 DI 10.1109/21.247886 PG 14 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA MK215 UT WOS:A1993MK21500007 ER PT J AU GAUNAURD, GC STRIFORS, HC AF GAUNAURD, GC STRIFORS, HC TI FREQUENCY-DOMAIN AND TIME-DOMAIN ANALYSIS OF THE TRANSIENT RESONANCE SCATTERING RESULTING FROM THE INTERACTION OF A SOUND PULSE WITH SUBMERGED ELASTIC SHELLS SO IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL LA English DT Article ID SONAR CROSS-SECTIONS; SPHERICAL-SHELLS; ECHOES; UNDERWATER; WAVES; LAMB AB We present a resonance scattering analysis of the echoes returned by a submerged, air-filled, elastic spherical shell, and also from a rigid sphere, when they are insonified by sound pulses. We consider arbitrary pulsed incidences of any duration, carrier frequency, envelope and shape. Our approach is equally effective in the frequency and the time domains. We compare backscattered echoes returned by the structures under study in various instances, which we predict by exact modal approaches, and by the approximate Kirchhoff method. We examine the effects of pulse duration, and in particular, we examine the various kinds of resonances that develop when a shell is insonified by extremely narrow-banded pulses. We also examine the concept of an ''impulse sonar,'' for incident pulses that are short and broad-banded. We conclude with an inverse scattering analysis that shows an example of how and how well physical target characteristics extracted in situ from the remotely sensed echoes can be used for target identification. We construct various sample cases, and then solve them and interpret results. C1 NATL DEF RES ESTAB,S-17290 SUNDBYBERG,SWEDEN. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,RES DEPT,DAHLGREN DIV,SILVER SPRING,MD 20903, USA. NR 34 TC 15 Z9 15 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 0885-3010 J9 IEEE T ULTRASON FERR JI IEEE Trans. Ultrason. Ferroelectr. Freq. Control PD JUL PY 1993 VL 40 IS 4 BP 313 EP 324 DI 10.1109/58.251279 PG 12 WC Acoustics; Engineering, Electrical & Electronic SC Acoustics; Engineering GA LR851 UT WOS:A1993LR85100006 PM 18263186 ER PT J AU ROWE, NC GUGLIELMO, EJ AF ROWE, NC GUGLIELMO, EJ TI EXPLOITING CAPTIONS IN RETRIEVAL OF MULTIMEDIA DATA SO INFORMATION PROCESSING & MANAGEMENT LA English DT Article ID SYSTEM AB Descriptive natural-language captions can help organize multimedia data. We describe our MARIE system, which interprets English queries directing the retrieval of media objects. It is novel in the extent to which it exploits previously interpreted and indexed English captions for the media objects. Our routine filtering of queries through descriptively complex captions (as opposed to keyword lists) before retrieving data can actually improve retrieval speed, as media data are often bulky and time-consuming to retrieve and difficult upon which to perform content analysis, and even small improvements to query precision can often pay off. Handling the English of captions and queries about them is not as difficult as it might seem, as the matching does not require deep understanding, just a comprehensive type hierarchy for caption concepts. An important innovation of MARIE is ''supercaptions'' describing sets of captions, which can minimize caption redundancy. RP ROWE, NC (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,CODE CSRP,MONTEREY,CA 93943, USA. NR 21 TC 10 Z9 10 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 JUL-AUG PY 1993 VL 29 IS 4 BP 453 EP 461 DI 10.1016/0306-4573(93)90041-B PG 9 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA LN321 UT WOS:A1993LN32100005 ER PT J AU KANBOURSHAKIR, A SAWADY, J KANBOUR, AI KUNSCHNER, A STOCK, RJ AF KANBOURSHAKIR, A SAWADY, J KANBOUR, AI KUNSCHNER, A STOCK, RJ TI PRIMITIVE NEUROECTODERMAL TUMOR ARISING IN AN OVARIAN MATURE CYSTIC TERATOMA - IMMUNOHISTOCHEMICAL AND ELECTRON-MICROSCOPIC STUDIES SO INTERNATIONAL JOURNAL OF GYNECOLOGICAL PATHOLOGY LA English DT Note DE NEUROECTODERMAL TUMOR; OVARIAN CYSTIC TERATOMA; NEUROEPITHELIOMA; HISTOGENESIS ID SMALL-CELL-CARCINOMA; NEURO-BLASTOMA; NEUROEPITHELIOMA; ORIGIN; YOUNG AB The occurrence of a malignant neuroectodermal tumor in a mature cystic teratoma is extremely rare. Five cases of ovarian primitive neuroectodermal tumors (PNET) or neuroepitheliomas have been reported. In two, the tumor was adjacent to foci of a mature teratomatous element. We present the immunohistochemical profile and electron microscopic study of an ovarian mature cystic teratoma with PNET or malignant neuroepithelioma. The transition between the mature neural elements and the malignant PNET presents a model for monodermic neuroepithelial differentiation and explains the histogenesis of this unusual tumor. C1 UNIV PITTSBURGH,MAGEE WOMENS HOSP,SCH MED,DEPT OBSTET & GYNECOL,PITTSBURGH,PA 15213. USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA. USN HOSP,DEPT PATHOL,PORTSMOUTH,VA. RP KANBOURSHAKIR, A (reprint author), UNIV PITTSBURGH,MAGEE WOMENS HOSP,SCH MED,DEPT PATHOL,300 HALKET ST,PITTSBURGH,PA 15213, USA. NR 25 TC 18 Z9 18 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0277-1691 J9 INT J GYNECOL PATHOL JI Int. J. Gynecol. Pathol. PD JUL PY 1993 VL 12 IS 3 BP 270 EP 275 DI 10.1097/00004347-199307000-00012 PG 6 WC Obstetrics & Gynecology; Pathology SC Obstetrics & Gynecology; Pathology GA LJ341 UT WOS:A1993LJ34100012 PM 8344764 ER PT J AU COOPER, KP AYERS, JD AF COOPER, KP AYERS, JD TI COUNTER-ROTATING FLUID ATOMIZATION SO INTERNATIONAL JOURNAL OF POWDER METALLURGY LA English DT Article ID METAL AB Studies were conducted of the atomization of molten streams of tin injected into rapidly moving oil contained within the rim of a spinning cup. The method consisted of forcing the melt by centrifugal force through fine orifices on the perimeter of a rotating cup centered within the oil-containing cup. Efforts were directed towards determining the effects of the processing parameters on powder characteristics. Under optimum processing conditions, mean particle sizes < 10 mum were obtained in runs where >90% of the powder collected was < 30 mum. From the observations made in this study, an attempt was made to formulate a basic understanding of the interactions between the melt stream and the atomizing fluid in such processes. RP COOPER, KP (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,CODE 6321,WASHINGTON,DC 20375, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU AMER POWDER METALLURGY INST PI PRINCETON PA 105 COLLEGE ROAD EAST, PRINCETON, NJ 08540 SN 0888-7462 J9 INT J POWDER METALL JI Int. J. Powder Metall. PD JUL PY 1993 VL 29 IS 3 BP 215 EP 228 PG 14 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA LM532 UT WOS:A1993LM53200001 ER PT J AU KOLTYN, KF SHAKE, CL MORGAN, WP AF KOLTYN, KF SHAKE, CL MORGAN, WP TI INTERACTION OF EXERCISE, WATER TEMPERATURE AND PROTECTIVE APPAREL ON BODY AWARENESS AND ANXIETY SO INTERNATIONAL JOURNAL OF SPORT PSYCHOLOGY LA English DT Article DE ANXIETY; BODY AWARENESS; CORE TEMPERATURE; PROTECTIVE APPAREL; SCUBA; WATER TEMPERATURE AB The purpose of this investigation was to examine the anxiety responses of divers in warm (29) and cold (180) water with and without a wet suit. Ten certified male scuba divers served as subjects. The exercise session consisted of 30-min of submerged finning at a power output equivalent to 35% of each subjects underwater VO2 Max. Each subject completed four swimming trials. Results revealed that state anxiety increased significantly (P < 0.03) under the cold condition without a wet suit and the warm condition with 4 wet suit. There was also a significant increase (P < 0.02) in body awareness in the cold condition without a suit and the warm condition with a wet suit. Results suggest that the customary anxiolytic effect associated with aerobic exercise on land may not occur following underwater finnig for 30-min at a power output of 35% VO2 max. C1 UNIV WISCONSIN,SPORT PSYCHOL LAB,UNIT GYMNASIUM 2,2000 OBSERV DR,MADISON,WI 53706. USN,SUBMARINE MED RES LAB,GROTON,CT 06340. NR 14 TC 8 Z9 8 U1 0 U2 0 PU EDIZIONI LUIGI POZZI PI ROME PA VIA PANAMA 68, 00198 ROME, ITALY SN 0047-0767 J9 INT J SPORT PSYCHOL JI Int. J. Sport Psychol. PD JUL-SEP PY 1993 VL 24 IS 3 BP 297 EP 305 PG 9 WC Hospitality, Leisure, Sport & Tourism; Psychology; Psychology, Multidisciplinary; Sport Sciences SC Social Sciences - Other Topics; Psychology; Sport Sciences GA LX236 UT WOS:A1993LX23600004 ER PT J AU BOBROVSKAYA, VV GRIGOROV, NL ZHURAVLEV, DA KONDRATEVA, MA PANASIUK, MI PANINA, LP TRETYAKOVA, CA ADAMS, J TULKA, A AF BOBROVSKAYA, VV GRIGOROV, NL ZHURAVLEV, DA KONDRATEVA, MA PANASIUK, MI PANINA, LP TRETYAKOVA, CA ADAMS, J TULKA, A TI A NEW METHOD OF COSMIC-RAY ANOMALOUS COMPONENT INVESTIGATIONS SO IZVESTIYA AKADEMII NAUK SERIYA FIZICHESKAYA LA Russian DT Article ID CHARGE STATE; OXYGEN C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP BOBROVSKAYA, VV (reprint author), MOSCOW MV LOMONOSOV STATE UNIV, NUCL PHYS RES INST, MOSCOW, RUSSIA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU MEZHDUNARODNAYA KNIGA PI MOSCOW PA 39 DIMITROVA UL., MOSCOW, 113095, RUSSIA SN 1026-3489 J9 IZV AKAD NAUK FIZ+ JI Izv. Akad. Nauk Ser. Fiz. PD JUL PY 1993 VL 57 IS 7 BP 62 EP 65 PG 4 WC Physics, Multidisciplinary SC Physics GA LT596 UT WOS:A1993LT59600018 ER PT J AU SWANDIC, JR AF SWANDIC, JR TI THEORY OF MICROWAVE EFFECTS ON BUBBLE DOSIMETERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HOMOGENEOUS NUCLEATION; ABSORPTION; DETECTOR; PHASE AB Bubble dosimeters measure a neutron flux by its effect upon microscopic droplets of superheated liquid encased in a polymer gel. It has been observed that a microwave field can also induce bubble formation in some of the droplets. This article considers the theory of this phenomenon as an effect of a microwave-induced temperature increase. Although the droplets are superheated, their confinement by a smooth gel surface and lack of impurities such as dust particles allow only homogeneous nucleation to occur. At room temperature the thermal fluctuations that give rise to critical size bubbles are very rare; the dosimeter thus has a long shelf life and a low spontaneous noise level. In the presence of a microwave field, the gel and droplets absorb energy and can be heated by 1-2 K for moderate powers; a high-power microwave field is needed to produce an observable nucleation rate. The electromagnetic properties of the dosimeter determine the internal field and the microwave absorption. Then the microwave heating and thermal properties of the dosimeter lead to an elevated steady-state temperature for the droplets. Finally, the nucleation rate is obtained from classical homogeneous nucleation theory, while the number of bubbles formed in an ensemble of droplets is found by a simple statistical argument. Although a special case is considered and several approximations are invoked, the qualitative results show this effect could lead to spurious neutron readings only for intense microwave fields or for an ambient temperature close to the nucleation temperature. For microwave bubble dosimetry, some nonthermal mechanism would be much more useful. RP SWANDIC, JR (reprint author), USN,CTR SURFACE WARFARE,CODE R36,SILVER SPRING,MD 20903, USA. NR 40 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 JUL 1 PY 1993 VL 74 IS 1 BP 10 EP 14 DI 10.1063/1.354141 PG 5 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900002 ER PT J AU MEHLMAN, G CHRISEY, DB BURKHALTER, PG HORWITZ, JS NEWMAN, DA AF MEHLMAN, G CHRISEY, DB BURKHALTER, PG HORWITZ, JS NEWMAN, DA TI VACUUM-ULTRAVIOLET SPECTROSCOPY STUDY OF EXCIMER-LASER-GENERATED PLASMAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SUPERCONDUCTING THIN-FILMS; HIGH-TC; DEPOSITION AB The dispersed emission in the vacuum ultraviolet (VUV) (1200-3000 angstrom) from the plasma generated by the interaction of a KrF excimer laser with an Al and a YBa2Cu3O7 target has been measured. Emission spectra were collected as a function of distance above the target surface and as a function of laser fluence. The qualitative features of the plasmas from the two different targets were similar. The character of the emission spectra changed from a pseudocontinuous emission at the target surface to discrete emission from singly, doubly ionized species as well as neutrals at distances greater than approximately 1.5 mm. The spatial variation indicated two regions: a high-density sheath along the target where the core emission is close to blackbody; and beyond, a plasma with large opacity emitting a UV spectrum of intensity decreasing fast with distance. Estimates of the plasma temperature and density were between 2 and 4 eV and approximately 10(18)/cm(3), respectively. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MEHLMAN, G (reprint author), SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 17 TC 23 Z9 23 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 JUL 1 PY 1993 VL 74 IS 1 BP 53 EP 61 DI 10.1063/1.355267 PG 9 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900009 ER PT J AU YU, KM WALUKIEWICZ, W CHAN, LY LEON, R HALLER, EE JAKLEVIC, JM HANSON, CM AF YU, KM WALUKIEWICZ, W CHAN, LY LEON, R HALLER, EE JAKLEVIC, JM HANSON, CM TI EFFECTS OF RAPID QUENCHING ON THE IMPURITY SITE LOCATION IN ZN-DIFFUSED INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID P-TYPE ZNSE; LATTICE LOCATION; GALLIUM-ARSENIDE; ZINC; SEMICONDUCTORS; CRYSTALS; ACCEPTOR; LI AB The lattice locations of Zn atoms in heavily Zn-doped InP single crystal have been investigated by ion channeling techniques. The InP samples were rapidly quenched in diffusion pump oil after high-temperature Zn diffusion. Ion channeling experiments performed along various major crystal axes suggest that a large fraction (20%-30%) of the Zn atoms are in the tetrahedral interstitial position in the InP lattice. It has been found that although the maximum hole concentration is not significantly affected by the cooling rate, there is a substantial increase in the incorporation of Zn on substitutional and tetrahedral interstitial lattice locations in the rapidly cooled samples as compared to the slowly cooled samples. The consequences of these results for understanding the mechanisms leading to the saturation of the free-hole concentration in compound semiconductors are discussed. C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152. RP YU, KM (reprint author), LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. RI Yu, Kin Man/J-1399-2012 OI Yu, Kin Man/0000-0003-1350-9642 NR 26 TC 26 Z9 26 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 JUL 1 PY 1993 VL 74 IS 1 BP 86 EP 90 DI 10.1063/1.355202 PG 5 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900014 ER PT J AU BROUSSARD, PR ALLEN, LH CESTONE, VC WOLF, SA AF BROUSSARD, PR ALLEN, LH CESTONE, VC WOLF, SA TI YBA2CU3O7-Y/Y2BACUO5 COMPOSITES - GROWTH AND CHARACTERIZATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CRITICAL CURRENTS; OXIDES; FILMS AB We have prepared thin film composites of Y1Ba2Cu3O7-y (''123'') and Y2Ba1Cu1O5 (''211'') by off-axis sputtering from separate targets of the 123 and 211 material. X-ray diffraction on the films shows the presence of c-axis oriented 123, and (00 L) ordered Y2O3, but no indication of 211 lines. The c-axis lattice constant does not show any change compared to our pure 123 films. As the volume percentage of 211 material increases, we see a reduction in T(c) and J(c), and an increase in the resistivity. The temperature and field dependence of the critical current are different for our composites compared to our pure 123 films. RP BROUSSARD, PR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 13 TC 12 Z9 12 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 JUL 1 PY 1993 VL 74 IS 1 BP 446 EP 450 DI 10.1063/1.355278 PG 5 WC Physics, Applied SC Physics GA LK469 UT WOS:A1993LK46900068 ER PT J AU YOUNG, AJ SAWKA, MN QUIGLEY, MD CADARETTE, BS NEUFER, PD DENNIS, RC VALERI, CR AF YOUNG, AJ SAWKA, MN QUIGLEY, MD CADARETTE, BS NEUFER, PD DENNIS, RC VALERI, CR TI ROLE OF THERMAL FACTORS ON AEROBIC CAPACITY IMPROVEMENTS WITH ENDURANCE TRAINING SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE AEROBIC EXERCISE ADAPTATIONS; PHYSICAL FITNESS; BODY TEMPERATURE REGULATION; MAXIMAL OXYGEN UPTAKE; ERYTHROCYTE VOLUME; CITRATE SYNTHASE ID BLOOD-VOLUME; EXERCISE; WATER; MEN; PLASMA AB This investigation studied the importance of the rise in body temperature during exercise for aerobic capacity adaptations produced by endurance training. The approach used was to compare training effects produced by subjects exercising in hot (35-degrees-C) water vs. cold (20-degrees-C) water. Hot water was used to potentiate, and cold water to blunt, the rise in body temperature during exercise. Eighteen young men trained by cycle-ergometer exercise at 60% of maximal oxygen uptake (VO2max) while immersed to the neck in either hot (HWT, n = 9) or cold (CWT, n = 9) water for 60 min, 5 days/wk, for 8 wk. Before and after training, Vo2max, erythrocyte volume, plasma volume, and vastus lateralis citrate synthase activity were measured. Training increased (P < 0.01) Vo2max by 13%, with no difference between HWT and CWT in the magnitude of the effect. Erythrocyte volume increased 4% (P < 0.01) with training, with no difference between HWT and CWT in the magnitude of the effect. Plasma volume remained unchanged by training in both the HWT and CWT groups. Last, vastus lateralis citrate synthase activity increased by 38% with training, but there was no difference between HWT and CWT in the training effect. Thus, exercise-induced body temperature elevations are not an important stimulus for the aerobic adaptations to moderate-intensity endurance training. C1 BOSTON UNIV,MED CTR,USN,BLOOD RES LAB,BOSTON,MA 02118. RP YOUNG, AJ (reprint author), USA,ENVIRONM MED RES INST,DIV THERMAL PHYSIOL & MED,NATICK,MA 01760, USA. NR 27 TC 14 Z9 14 U1 1 U2 2 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD JUL PY 1993 VL 75 IS 1 BP 49 EP 54 PG 6 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA LN649 UT WOS:A1993LN64900007 PM 8376300 ER PT J AU COOPER, JR LEE, LH MACYS, DA AF COOPER, JR LEE, LH MACYS, DA TI DEVELOPMENTAL TOXICITY OF OTTO FUEL-II IN THE RAT AND RABBIT SO JOURNAL OF APPLIED TOXICOLOGY LA English DT Article DE OTTO FUEL-II; TERATOLOGY; RAT; RABBIT; PROPYLENE GLYCOL DINITRATE (PGDN) AB OTTO Fuel II (OFII) is a propellent used by the United States Navy in its Mk 46 and Mk 48 torpedoes. Owing to the possibility of human exposure during fueling and defueling operations, studies were initiated to determine if OFII was a developmental toxin. Phase I of the investigation involved dosing four groups of time-mated Fischer-344 rats with OFII. The fuel was administered dermally at the rate of 0, 400, 2000 and 4000 mg kg-1 day-1. A significant reduction in body weight was seen at necropsy in dams receiving 2000 and 4000 mg kg-1 day-1 of OFII. Fetuses from these dams also weighed significantly less than control fetuses. Phase II of the investigation involved dosing of artificially inseminated rabbits with OFII. The fuel was administered to the skin of the animal's back at the rate of 0, 100, 316 and 1000 mg kg-1 day-1. Maternal toxicity was evidenced by a significant reduction in body weight of the dams in the 1000 mg kg-1 day-1 dose group on days 20 and 25 of gestation. There were no significant differences observed in maternal weight or fetal weight at necropsy. Morphological examination of both rat and rabbit fetuses failed to reveal significant evidence of fetal malformations. C1 USN,MED RES INST,WRIGHT PATTERSON AFB,OH 45433. RP COOPER, JR (reprint author), ARMSTRONG LAB,COMPARAT MED BRANCH,WRIGHT PATTERSON AFB,OH 45433, USA. NR 16 TC 0 Z9 1 U1 1 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0260-437X J9 J APPL TOXICOL JI J. Appl. Toxicol. PD JUL-AUG PY 1993 VL 13 IS 4 BP 235 EP 239 DI 10.1002/jat.2550130405 PG 5 WC Toxicology SC Toxicology GA LP823 UT WOS:A1993LP82300003 PM 8376723 ER PT J AU ALM, RA GUERRY, P TRUST, TJ AF ALM, RA GUERRY, P TRUST, TJ TI THE CAMPYLOBACTER SIGMA(54) FLAB FLAGELLIN PROMOTER IS SUBJECT TO ENVIRONMENTAL-REGULATION SO JOURNAL OF BACTERIOLOGY LA English DT Article ID SALMONELLA-TYPHIMURIUM; SEQUENCE-ANALYSIS; NUCLEOTIDE-SEQUENCE; NITROGEN REGULATION; RHIZOBIUM-MELILOTI; RNA-POLYMERASE; DNA-SEQUENCE; CELL-CYCLE; GENE HAG; JEJUNI AB The complex flagellum of Campylobacter coli VC167 is encoded by two tandemly oriented flagellin genes which are transcribed as two discrete transcriptional units from two different classes of promoters. The flaB gene, which encodes the minor FlaB filament protein, is controlled by a sigma54 promoter. A transcriptional fusion between a promoterless chloramphenicol acetyltransferase (CAT) reporter gene cartridge and C. coli VC167 DNA carrying flaB transcription and translation signals, including the typical position -13-to--26flaB sigma54 consensus promoter sequence, was constructed. When carried on plasmid pRIC1013, the sigma54-CAT fusion expressed chloramphenicol resistance in Escherichia coli, and CAT production was affected by the pH of the growth medium, the composition of the growth atmosphere, and the growth temperature, with production being significantly higher at 42-degrees-C. A conjugative suicide vector, pRIC1028, containing the sigma54-CAT fusion was constructed and used to recombine the flaB-CAT fusion back into the C. coli chromosome in the correct position with respect to the flaA gene and its transcription terminator. CAT production from the flaB sigma54 promoter in the C. coli transconjugant VC167-T2/28-1 was shown to peak at mid-log phase and to be modulated by growth medium pH, growth temperature, and the concentration of certain inorganic salts and divalent cations in the growth medium. Under growth conditions which promoted elevated flaB sigma54 promoter activity, a flaA flaB+ mutant of C. coli VC167 produced increased amounts of FlaB flagellar protein and displayed increased motility. C1 UNIV VICTORIA,DEPT BIOCHEM & MICROBIOL,VICTORIA V8W 3P6,BC,CANADA. USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD 20814. NR 47 TC 57 Z9 58 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD JUL PY 1993 VL 175 IS 14 BP 4448 EP 4455 PG 8 WC Microbiology SC Microbiology GA LM260 UT WOS:A1993LM26000021 PM 8331072 ER PT J AU COVEY, DC ALBRIGHT, JA AF COVEY, DC ALBRIGHT, JA TI BRACHIAL-PLEXUS BIRTH PALSIES - REPLY SO JOURNAL OF BONE AND JOINT SURGERY-BRITISH VOLUME LA English DT Letter C1 LSU,SCH MED,SHREVEPORT,LA. RP COVEY, DC (reprint author), USN HOSP,BREMERTON,WA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BRITISH EDITORIAL SOC BONE JOINT SURGERY PI LONDON PA 22 BUCKINGHAM STREET, LONDON, ENGLAND WC2N 6ET SN 0301-620X J9 J BONE JOINT SURG BR JI J. Bone Joint Surg.-Br. Vol. PD JUL PY 1993 VL 75 IS 4 BP 666 EP 666 PG 1 WC Orthopedics; Surgery SC Orthopedics; Surgery GA LM943 UT WOS:A1993LM94300035 ER PT J AU BOWEN, HF KOURI, DJ MOWREY, RC YINNON, AT GERBER, RB AF BOWEN, HF KOURI, DJ MOWREY, RC YINNON, AT GERBER, RB TI MOLECULE-CORRUGATED SURFACE COLLISIONS - CONVERGED CLOSE-COUPLING WAVE-PACKET AND QUASI-CLASSICAL TRAJECTORY CALCULATIONS FOR N2 SCATTERING FROM CORRUGATED LATTICES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEPENDENT SCHRODINGER-EQUATION; MEDIATED SELECTIVE ADSORPTION; DIRECT INELASTIC-SCATTERING; ROTATIONAL ENERGY-TRANSFER; FOURIER METHOD SOLUTION; ATOM-DIATOM COLLISIONS; WAVEPACKET CALCULATIONS; PHOTO-DISSOCIATION; CRYSTAL COLLISIONS; RAMAN-SCATTERING AB The close coupling wave packet (CCWP) and quasiclassical trajectory methods are used to study rotationally inelastic scattering of N2 from static, corrugated surfaces. The collision energy in these calculations ranges from 10 to 100 meV; 18 711 quantum states are included in the highest energy calculations to ensure convergence. The scattered molecules are analyzed with respect to the polarization of the final angular momentum vector and the amount of energy transferred into rotational motion and translational motion parallel to the surface. Comparisons of quantum and quasiclassical results show that quantum effects are important even with the relatively large mass of N2 and the high scattering energies used and can be seen even after summing over many final quantum states. A test of a factorization relation derived from the coordinate-representation sudden (CRS) approximation gives qualitative agreement with the exact quantum results. C1 UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. HEBREW UNIV JERUSALEM,DEPT PHYS CHEM,JERUSALEM,ISRAEL. HEBREW UNIV JERUSALEM,FRITZ HABER RES CTR MOLEC DYNAM,JERUSALEM,ISRAEL. NR 97 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUL 1 PY 1993 VL 99 IS 1 BP 704 EP 720 DI 10.1063/1.465743 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LJ308 UT WOS:A1993LJ30800076 ER PT J AU HEGEDUS, CR KAMEL, IL AF HEGEDUS, CR KAMEL, IL TI POLYMER-FILLER INTERACTION EFFECTS ON COATING PROPERTIES SO JOURNAL OF COATINGS TECHNOLOGY LA English DT Article AB Previous studies were performed to analyze the surface properties of titanium dioxide (TiO2) pigments surfaces, the thermodynamics of poly(methyl methacrylate) (PMMA) and methyl methacrylate (MMA) adsorption onto these surfaces from solution, and the resulting adsorbed polymer layer (adlayer) thickness. In the current study, these pigments and PMMA were formulated into coatings. Coating properties were characterized and analyzed with respect to the thermodynamic and physical adsorption results. TiO2 pigments which had more favorable adsorption free energies and enthalpies with PMMA and MMA resulted in coatings with better dispersion quality and stability, greater resistance to salt spray, and better barrier properties. In contrast, these fillers had detrimental effects on adhesion and flexibility. These results were attributed to extensive interactions between filler and polymer which improved the dispersion, decreased the permeability, and increased the rigidity of the polymer matrix. These extensive interactions are also suspected to create internal strain within the coatings, causing them to fail prematurely as external forces are applied during the adhesion and flexibility tests. It has been demonstrated that a prior knowledge of filler surfaces and filler-polymer affinity can be used to formulate coatings with tailored properties. C1 DREXEL UNIV,DEPT MAT ENGN,PHILADELPHIA,PA 19104. RP HEGEDUS, CR (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,WARMINSTER,PA 18974, USA. NR 15 TC 13 Z9 17 U1 0 U2 3 PU FEDERATION SOC COATING TECH PI BLUE BELL PA 492 NORRISTOWN ROAD, BLUE BELL, PA 19422 SN 0361-8773 J9 J COATING TECHNOL JI J. Coat. Technol. PD JUL PY 1993 VL 65 IS 822 BP 37 EP 43 PG 7 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA LN797 UT WOS:A1993LN79700003 ER PT J AU BRENNAN, FJ GOFF, WB AF BRENNAN, FJ GOFF, WB TI SEAT-BELT INJURY TO A PELVIC KIDNEY AS DEMONSTRATED BY CT SO JOURNAL OF COMPUTER ASSISTED TOMOGRAPHY LA English DT Article C1 USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. RP BRENNAN, FJ (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0363-8715 J9 J COMPUT ASSIST TOMO JI J. Comput. Assist. Tomogr. PD JUL-AUG PY 1993 VL 17 IS 4 BP 664 EP 665 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA LM749 UT WOS:A1993LM74900032 PM 8331245 ER PT J AU STICKLES, RW DODDS, WJ KOBLISH, TR SAGER, J CLOUSER, S AF STICKLES, RW DODDS, WJ KOBLISH, TR SAGER, J CLOUSER, S TI INNOVATIVE HIGH-TEMPERATURE AIRCRAFT ENGINE FUEL NOZZLE DESIGN SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 37TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 01-04, 1992 CL COLOGNE, GERMANY AB The objective of the Innovative High-Temperature Aircraft Engine Fuel Nozzle Program was to design and evaluate a nozzle capable of operating at a combustor inlet air temperature of 1600-degrees-F (1144 K) and a fuel temperature of 350-degrees-F (450 K). The nozzle was designed to meet the same performance requirements and fit within the size envelope of a current production F404 dual orifice fuel nozzle. The design approach was to use improved thermal protection and fuel passage geometry in combination with fuel passage surface treatment to minimize coking at these extreme fuel and air temperatures. Heat transfer models of several fuel injector concepts were used to optimize the thermal protection, while a series of sample tube coking tests were run to evaluate the effect of surface finish, coatings, and tube material on the coking rate. Based on heat transfer analysis, additional air gaps, reduced fuel passage flow area, and ceramic tip components reduced local fuel wetted wall temperatures by more than 200-degrees-F (110 K) when compared to a current production F404 fuel nozzle. Sample tube coking test results showed the importance of surface finish on the fuel coking rate. Therefore, a 1 mum. (0.025 mum) roughness was specified for all fuel passage surfaces. A novel flow divider valve in the tip was also employed to reduce weight, allow room for additional thermal protection, and provide back pressure to reduce the risk of fuel vaporization. Phase II of this program will evaluate the fuel nozzle with a series of contaminated fuel and coking tests. C1 FUEL SYST TEXTRON,NEW PROD DEV,ZEELAND,MI 49464. USN,CTR AIR PROPULS,TRENTON,NJ 08628. RP STICKLES, RW (reprint author), GE AIRCRAFT ENGINES,ADV ENGINE COMBUSTOR AERO DESIGN,CINCINNATI,OH 45215, USA. NR 7 TC 4 Z9 6 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD JUL PY 1993 VL 115 IS 3 BP 439 EP 446 DI 10.1115/1.2906728 PG 8 WC Engineering, Mechanical SC Engineering GA LP656 UT WOS:A1993LP65600002 ER PT J AU AGRAWAL, BN AF AGRAWAL, BN TI DYNAMIC CHARACTERISTICS OF LIQUID MOTION IN PARTIALLY FILLED TANKS OF A SPINNING SPACECRAFT SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article ID FLUID AB This paper presents a boundary-layer model to predict dynamic characteristics of liquid motion in partially filled tanks of a spinning spacecraft. The solution is obtained by solving three boundary-value problems: an inviscid fluid problem, a boundary-layer problem, and a viscous correction problem. The boundary-layer solution is obtained analytically, and the solutions to inviscid and viscous correction problems are obtained by using finite element methods. The model has been used to predict liquid natural frequencies, mode shapes, damping ratios, and nutation time constants for a spinning spacecraft. The results show that liquid motion in general will contain significant circulatory motion due to Coriolis forces except in the first azimuth and first elevation modes. Therefore, only these two modes can be represented accurately by equivalent pendulum models. The analytical results predict a sharp drop in nutation time constants for certain spacecraft inertia ratios and tank fill fractions. This phenomenon was also present during on-orbit liquid slosh tests and ground air-bearing tests. RP AGRAWAL, BN (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 12 TC 18 Z9 18 U1 0 U2 2 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD JUL-AUG PY 1993 VL 16 IS 4 BP 636 EP 640 DI 10.2514/3.21061 PG 5 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA LM739 UT WOS:A1993LM73900005 ER PT J AU ROSS, IM AF ROSS, IM TI NUTATIONAL STABILITY AND CORE ENERGY OF A QUASI-RIGID GYROSTAT SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article ID SPACECRAFT AB The asymptotic nutational stability of a quasirigid gyrostat is analyzed. The primary purpose of this analysis is to resolve a debate concerning the use of the energy-sink method of analysis for systems containing driven rotors. It is shown that when the work done by the motor torque is not taken into account, the analysis leads to a contradiction even when the total energy is dissipative. A proper application of Landon's original idea yields a relationship between the time rate of change of Hubert's ''core energy'' and the energy dissipation rate of the damping mechanisms in the spacecraft. The analysis shows that the core energy might increase during a rotor despin condition; hence, the minimality of core energy-a previous criterion-is not always guaranteed. A criterion for the design of the damper to insure dissipation of the core energy is presented; this condition is always satisfied for the case of a constant relative rotor spin speed that facilitates a ''closed-form'' solution to the nutation angle time history of an axisymmetric gyrostat. The stability condition resulting from this analysis is consistent with the Landon-Iorillo stability criterion. RP ROSS, IM (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MAIL CODE AA-RD,MONTEREY,CA 93943, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD JUL-AUG PY 1993 VL 16 IS 4 BP 641 EP 647 DI 10.2514/3.21062 PG 7 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA LM739 UT WOS:A1993LM73900006 ER PT J AU SPECTOR, SA HSIA, K PRATT, D LATHEY, J MCCUTCHAN, JA ALCARAZ, JE ATKINSON, JH GULEVICH, S WALLACE, M GRANT, I AF SPECTOR, SA HSIA, K PRATT, D LATHEY, J MCCUTCHAN, JA ALCARAZ, JE ATKINSON, JH GULEVICH, S WALLACE, M GRANT, I TI VIROLOGICAL MARKERS OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 IN CEREBROSPINAL-FLUID SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID IMMUNE-DEFICIENCY SYNDROME; SUBACUTE ENCEPHALITIS; SYNDROME AIDS; BRAIN-TISSUE; INFECTION; HIV-1; ABNORMALITIES; ZIDOVUDINE; DISEASE; IDENTIFICATION AB As part of a longitudinal study, 265 cerebrospinal fluid (CSF) specimens from 204 human immunodeficiency virus type 1 (HIV-1)-seropositive subjects and 43 seronegative controls were evaluated. Of the 204 seropositive persons, 78 (38%) had greater-than-or-equal-to 1 CSF culture positive for HIV-1; the probability of being culture positive increased as the number of CSF samples obtained increased (P = .0018). Significantly correlated with culture positivity were elevations in CSF protein level (P = .014) and CSF white blood cell count (P = .001). Virus was more readily cultured from clarified CSF (89%, 42/47) than from the cellular fraction (30%, 14/47; P < .00001). Amplification of HIV-1 DNA by polymerase chain reaction (PCR) from 25 seropositive persons was positive in 9 (82%) of 11 culture-positive and in 4 (29%) of 14 culture-negative specimens, while amplification of viral RNA detected all 11 culture-positive and 9 (64%) of the 14 culture-negative CSF specimens. These data support the hypothesis that the development of HIV-1-associated neurocognitive disorders are not dependent solely on the presence of HIV-1 within the central nervous system. C1 UNIV CALIF SAN DIEGO,DEPT MED,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,DEPT MATH & STAT,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,DEPT PSYCHIAT,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,DEPT NEUROSCI,LA JOLLA,CA 92093. USN HOSP,CTR MOLEC GENET,SAN DIEGO,CA 92134. VET ADM MED CTR,SAN DIEGO,CA 92161. RP SPECTOR, SA (reprint author), UNIV CALIF SAN DIEGO,DEPT PEDIAT,9500 GILMAN DR,LA JOLLA,CA 92093, USA. FU NIMH NIH HHS [MH-43298, MH-45294] NR 39 TC 45 Z9 47 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD JUL PY 1993 VL 168 IS 1 BP 68 EP 74 PG 7 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LH880 UT WOS:A1993LH88000011 PM 8515134 ER PT J AU HASSAN, NF KOTKAT, A AF HASSAN, NF KOTKAT, A TI PREVALENCE OF ANTIBODIES TO HEPATITIS-C VIRUS IN PREGNANT-WOMEN IN EGYPT SO JOURNAL OF INFECTIOUS DISEASES LA English DT Letter ID BLOOD-DONORS C1 UNIV ALEXANDRIA,HIGH INST PUBL HLTH,DEPT TROP MED & HYG,ALEXANDRIA,EGYPT. RP HASSAN, NF (reprint author), USN,MED RES UNIT 3,DIV VIROL,HEPATITIS & HIV RES BRANCH,CAIRO,EGYPT. NR 8 TC 16 Z9 15 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD JUL PY 1993 VL 168 IS 1 BP 248 EP 249 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LH880 UT WOS:A1993LH88000045 PM 8390542 ER PT J AU OLSON, PE RICHARDS, AL DASCH, GA KENNEDY, CA AF OLSON, PE RICHARDS, AL DASCH, GA KENNEDY, CA TI FAILURE TO IDENTIFY BORRELIA-BURGDORFERI IN SOUTHERN CALIFORNIA TICKS BY DNA AMPLIFICATION SO JOURNAL OF INFECTIOUS DISEASES LA English DT Letter ID LYME-DISEASE C1 NAVAL MED RES UNIT 2,DEPT IMMUNOL,JAKARTA,INDONESIA. USN,MED RES INST INFECT DIS,BETHESDA,MD 20814. RP OLSON, PE (reprint author), USN HOSP,DEPT INTERNAL MED INFECT DIS,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD JUL PY 1993 VL 168 IS 1 BP 257 EP 258 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LH880 UT WOS:A1993LH88000053 PM 8515128 ER PT J AU CHAIKEN, A GUTIERREZ, CJ KREBS, JJ PRINZ, GA AF CHAIKEN, A GUTIERREZ, CJ KREBS, JJ PRINZ, GA TI COMPOSITION DEPENDENCE OF GIANT MAGNETORESISTANCE IN FE/AG/COXFE1-X SANDWICHES SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID MOLECULAR-BEAM EPITAXY; FE THIN-FILMS; ANISOTROPIC MAGNETORESISTANCE; MAGNETIC SUPERLATTICES; FE/CR SUPERLATTICES; MULTILAYERS; TEMPERATURE; EXCHANGE; ZNSE AB The magnitude of the giant or spin-valve magnetoresistance in ferromagnet/paramagnet/ferromagnet sandwiches depends on the choice of ferromagnet. In this study, the dependence of the giant magnetoresistance on the composition of the alloy layer in a series of Fe/Ag/CoxFe1-x sandwiches has been varied in order to get some insight into the fundamental origin of the effect. The CoxFe1-x alloy layers can be grown in the bcc phase throughout the range 0 less-than-or-equal-to x less-than-or-equal-to 1 using molecular beam epitaxy. The anisotropic magnetoresistance of these sandwiches shows a simple linear dependence on x, the Co fraction, but the giant magnetoresistance has a non-monotonic composition dependence. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 31 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD JUL PY 1993 VL 125 IS 1-2 BP 228 EP 238 DI 10.1016/0304-8853(93)90841-O PG 11 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA LQ747 UT WOS:A1993LQ74700033 ER PT J AU OVERFELT, PL AF OVERFELT, PL TI RINGS, QUADRATIC-FORMS, AND COMPLETE DEGENERACY FOR A SUBCLASS OF HIGHLY OVERMODED RECTANGULAR WAVE-GUIDES SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID EQUILATERAL TRIANGLE; SCHRODINGER-EQUATION; EIGENVALUES; PARTICLE AB In this article eigenvalue degeneracy formulas for a subclass of highly overmoded rectangular waveguides are determined. This subclass consists of those rectangular geometries with side length ratio, a/b, equal to the square root of a rational integer, square-root sigma, sigma is-an-element-of Z, and contains an unusual amount of degeneracy even when the side length ratio is irrational. The complete degeneracy for members of this subclass (sigma < 10) is determined by interpreting its normalized eigenvalue formula as (a) the norm of an associated ring of algebraic integers and (b) a special case of a positive definite binary integral quadratic form. RP OVERFELT, PL (reprint author), USN,CTR AIR WARFARE,RES DEPT,DIV PHYS,DIV WEAPONS,CHINA LAKE,CA 93555, USA. NR 23 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 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD JUL PY 1993 VL 34 IS 7 BP 2975 EP 2989 DI 10.1063/1.530110 PG 15 WC Physics, Mathematical SC Physics GA LK510 UT WOS:A1993LK51000023 ER PT J AU MORAN, D AF MORAN, D TI THE DEVELOPMENT OF MILITARY THOUGHT - THE 19TH-CENTURY - GAT,A SO JOURNAL OF MILITARY HISTORY LA English DT Book Review RP MORAN, D (reprint author), USN,COLL WAR,NEWPORT,RI 02840, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU VIRGINIA MILITARY INST PI LEXINGTON PA LEXINGTON, VA 24450 SN 0899-3718 J9 J MILITARY HIST JI J. Mil. Hist. PD JUL PY 1993 VL 57 IS 3 BP 547 EP 548 DI 10.2307/2943998 PG 2 WC History SC History GA LM044 UT WOS:A1993LM04400013 ER PT J AU NGAI, KL RENDELL, RW AF NGAI, KL RENDELL, RW TI COOPERATIVE DYNAMICS IN RELAXATION - A COUPLING MODEL PERSPECTIVE SO JOURNAL OF MOLECULAR LIQUIDS LA English DT Article ID DISPERSIVE DIFFUSION TRANSPORT; LITHIUM BORATE GLASSES; STRUCTURAL RELAXATION; TEMPERATURE DEPENDENCES; DIELECTRIC-RELAXATION; COMPUTER-SIMULATIONS; CORRELATED SYSTEMS; AMORPHOUS POLYMERS; ENTHALPY RECOVERY; MOLECULAR-WEIGHT AB Relaxation of identical constituents in complex systems, such as molecules in glass-forming viscous liquids, ions in vitreous ionic conductors or polymer chains in fully entangled polymer melts, is determined by cooperative processes of motions coupled together by interactions. Both experimental data and computer simulations of model complex systems support the physical picture and quantitative predictions provided by the coupling model. In this paper, the coupling model is summarized and examples of its accomplishments are given. The cooperativity arises mainly through coupling of the individual constituents and cannot be represented by a static distribution of relaxation times. The effect of the interactions, when averaged over the heterogeneous motions of all the relaxing constituents, produces a time-dependent rate for relaxation in linear response. The situation of nonequilibrium structural relaxation, such as enthalpy and volume recovery, is also discussed where the required averaging is then more complicated due to the interplay between the changing structure and the heterogeneous nature of the relaxing constituents. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 60 TC 19 Z9 19 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-7322 J9 J MOL LIQ JI J. Mol. Liq. PD JUL PY 1993 VL 56 BP 199 EP 214 DI 10.1016/0167-7322(93)80027-S PG 16 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LW564 UT WOS:A1993LW56400016 ER PT J AU ATKINSON, JLD AF ATKINSON, JLD TI TO FUSE OR NOT TO FUSE SO JOURNAL OF NEUROSURGERY LA English DT Letter RP ATKINSON, JLD (reprint author), USN HOSP,OAKLAND,CA 94627, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC NEUROLOGICAL SURGEONS PI CHARLOTTESVILLE PA UNIV VIRGINIA, 1224 WEST MAIN ST, STE 450, CHARLOTTESVILLE, VA 22903 SN 0022-3085 J9 J NEUROSURG JI J. Neurosurg. PD JUL PY 1993 VL 79 IS 1 BP 153 EP 153 PG 1 WC Clinical Neurology; Surgery SC Neurosciences & Neurology; Surgery GA LJ012 UT WOS:A1993LJ01200030 PM 8315459 ER PT J AU WU, CT AF WU, CT TI 3-STAGE, INCREMENTAL APPROACH IN TEACHING OOP SO JOURNAL OF OBJECT-ORIENTED PROGRAMMING LA English DT Article C1 USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SIGS PUBLICATIONS INC PI NEW YORK PA 588 BROADWAY SUITE 604, NEW YORK, NY 10012-5408 SN 0896-8438 J9 J OBJECT-ORIENT PROG JI J. Object-Oriented Program. PD JUL-AUG PY 1993 VL 6 IS 4 BP 86 EP 89 PG 4 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA LM470 UT WOS:A1993LM47000013 ER PT J AU KRATOCHVIL, FJ BRANNON, RB AF KRATOCHVIL, FJ BRANNON, RB TI CARTILAGE IN THE WALLS OF ODONTOGENIC KERATOCYSTS SO JOURNAL OF ORAL PATHOLOGY & MEDICINE LA English DT Note DE CARTILAGE; KERATOCYST; ODONTOGENIC CYST AB Only one histologically documented case of cartilage in the wall of an odontogenic keratocyst has been reported in the English language literature. Four new cases are presented with the clinical, radiographic and histopathologic features described. To our knowledge this finding has not been reported in association with any other type of odontogenic cyst. C1 USN,SCH DENT,DEPT ORAL PATHOL,BETHESDA,MD 20814. RP KRATOCHVIL, FJ (reprint author), ARMED FORCES INST PATHOL,DEPT ORAL PATHOL,WASHINGTON,DC 20306, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0904-2512 J9 J ORAL PATHOL MED JI J. Oral Pathol. Med. PD JUL PY 1993 VL 22 IS 6 BP 282 EP 285 DI 10.1111/j.1600-0714.1993.tb01072.x PG 4 WC Dentistry, Oral Surgery & Medicine; Pathology SC Dentistry, Oral Surgery & Medicine; Pathology GA LM900 UT WOS:A1993LM90000008 PM 8355225 ER EF