FN Thomson Reuters Web of Science™ VR 1.0 PT J AU NITHIANANDAM, J RIFE, JC WINDISCHMANN, H AF NITHIANANDAM, J RIFE, JC WINDISCHMANN, H TI CARBON-K EDGE SPECTROSCOPY OF INTERNAL INTERFACE AND DEFECT STATES OF CHEMICAL VAPOR-DEPOSITED DIAMOND FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID C 1S EXCITATION; FINE-STRUCTURE; CORE EXCITON; SURFACE AB We have made carbon K edge reflectivity and absorption measurements using synchrotron radiation on diamond crystals and chemical vapor deposited diamond films to determine their electronic structures. Our spectra of diamond films show that both sp2 and sp3 bonded carbon atoms are formed during initial nucleation and growth. Transmission spectra of a diamond film with 30 nm diameter crystallites show striking features below the carbon sp3 K edge due to internal interface states and/or defects. We compare these absorption features to x-ray absorption spectra of clean diamond (111) surface, graphite, and hydrocarbon gases to understand surface chemistry involved in the deposition process. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. BP AMER, RES & DEV, CLEVELAND, OH 44128 USA. NR 18 TC 44 Z9 44 U1 0 U2 3 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 JAN 6 PY 1992 VL 60 IS 1 BP 135 EP 137 DI 10.1063/1.107349 PG 3 WC Physics, Applied SC Physics GA GY794 UT WOS:A1992GY79400047 ER PT J AU MCGRATH, KJ ROLAND, CM AF MCGRATH, KJ ROLAND, CM TI MISCIBILITY IN POLY(VINYLETHYLENE) ISOTOPIC MIXTURES BY C-13 NMR SO MACROMOLECULES LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; F-19-C-13 CPMAS NMR; PHASE-SEPARATION; POLYMER BLENDS; NEUTRON-SCATTERING; PMMA/PVF2 BLENDS; MAGIC-ANGLE; THERMODYNAMICS; POLYBUTADIENE; POLYSTYRENE AB A solid-state NMR dipolar dephasing experiment is constructed to probe the phase morphology of isotopic blends of poly(vinylethylene). The strong dependence on the relevant spin separation distances of both the H-1-C-13 cross-polarization intensity and the extent of dipolar dephasing enables carbons from the components to be distinguished from one another. Using this method we demonstrate that the blend is segmentally mixed for component molecular weights at which the critical value of the interaction parameter, as calculated using the Flory-Huggins lattice model, is less than the actual interaction parameter of the blend. RP MCGRATH, KJ (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 39 TC 5 Z9 5 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 JAN 6 PY 1992 VL 25 IS 1 BP 166 EP 169 DI 10.1021/ma00027a028 PG 4 WC Polymer Science SC Polymer Science GA GZ539 UT WOS:A1992GZ53900028 ER PT J AU ROLAND, CM NGAI, KL AF ROLAND, CM NGAI, KL TI SEGMENTAL RELAXATION AND THE CORRELATION OF TIME AND TEMPERATURE DEPENDENCIES IN POLY(VINYL METHYL-ETHER) POLYSTYRENE MIXTURES SO MACROMOLECULES LA English DT Article ID MISCIBLE POLYMER BLENDS; AMORPHOUS POLYMERS; SUPERPOSITION; MISCIBILITY; BREAKDOWN; BEHAVIOR; REGION AB An analysis is presented of the glass transition dispersion in the dielectric spectrum of poly-(vinyl methyl ether) (PVME) mixed with polystyrene (PS). The spectrum is dominated by the response of the PVME, enabling its molecular motions to be studied as a function of both local composition and temperature. It is shown that through their effect on the degree of intermolecular cooperativity of the segmental dynamics concentration fluctuations effect a marked asymmetry in the band shape. PVME chain units in a PS-rich environment contribute to the dielectric loss primarily at lower frequencies and are characterized by more cooperative segmental relaxation. The dielectric response of these segments is more sensitive to temperature than PVME segments relaxing in a PVME-rich environment. This results in a failure of time-temperature superpositioning. The correlation observed for the time and temperature dependencies of PVME relaxation near its glass transition temperature is a consequence of intersegmental cooperativity. RP ROLAND, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 37 TC 152 Z9 152 U1 0 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JAN 6 PY 1992 VL 25 IS 1 BP 363 EP 367 DI 10.1021/ma00027a056 PG 5 WC Polymer Science SC Polymer Science GA GZ539 UT WOS:A1992GZ53900056 ER PT J AU BAUM, K BIGELOW, SS NGUYEN, NV ARCHIBALD, TG GILARDI, R FLIPPENANDERSON, JL GEORGE, C AF BAUM, K BIGELOW, SS NGUYEN, NV ARCHIBALD, TG GILARDI, R FLIPPENANDERSON, JL GEORGE, C TI SYNTHESIS AND REACTIONS OF 1,1-DIIODODINITROETHYLENE SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID PUSH-PULL; POLARIZED ETHYLENES; DOUBLE-BONDS; STEREOCHEMISTRY; BARRIERS; CRYSTAL; STATE AB The nitration of tetraiodoethylene gave 1,1-diiododinitroethylene (1). X-ray crystallography showed that one of the two nitro groups is perpendicular to the ethylene plane. Simple amines (dimethylamine, propylamine, aniline) reacted with 1 to give 1,1-diamino-2,2-dinitroethylene derivatives; diamines (o-phenylenediamine, ethylenediamine, 1,3-diaminopropane, 1,4-diaminobutane) gave the corresponding cyclic products, and a tetramine [(tetrakis(aminomethyl)methane] gave the analogous spiro derivative. Ammonia gave only ammonium cyanodinitromethide, whereas phenol gave 1,1-dinitro-2,2,2-triphenoxyethane. The reaction of 1 with potassium nitrite gave the dipotassium salt of tetranitroethane. X-ray crystallography of the 1,1-diamino-2,2-dinitroethylenes showed twisted olefins, some with twist angles greater than any previously reported for twisted ethylenes, with concomitant bond-distance distortions. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP BAUM, K (reprint author), FLUOROCHEM INC,AZUSA,CA 91702, USA. NR 45 TC 56 Z9 57 U1 0 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD JAN 3 PY 1992 VL 57 IS 1 BP 235 EP 241 DI 10.1021/jo00027a042 PG 7 WC Chemistry, Organic SC Chemistry GA GY184 UT WOS:A1992GY18400042 ER PT J AU PICKETT, WE KRAKAUER, H COHEN, RE SINGH, DJ AF PICKETT, WE KRAKAUER, H COHEN, RE SINGH, DJ TI FERMI SURFACES, FERMI LIQUIDS, AND HIGH-TEMPERATURE SUPERCONDUCTORS SO SCIENCE LA English DT Article ID HIGH-TC SUPERCONDUCTORS; DENSITY-FUNCTIONAL FORMALISM; ANGLE-RESOLVED-PHOTOEMISSION; TIME-REVERSAL SYMMETRY; ELECTRONIC-STRUCTURE; NORMAL-STATE; HUBBARD-MODEL; TRANSPORT-PROPERTIES; MOMENTUM DENSITY; SINGLE-CRYSTALS AB Recent experimental results are beginning to limit seriously the theories that can be considered to explain high-temperature superconductivity. The unmistakable observations of a Fermi surface, by several groups and methods, make it the focus of realistic theories of the metallic phases. Data from angle-resolved photoemission, positron annihilation, and de Haas-van Alphen experiments are in agreement with band theory predictions, implying that the metallic phases cannot be pictured as doped insulators. The character of the low energy excitations ("quasiparticles"), which interact strongly with atomic motions, with magnetic fluctuations, and possibly with charge fluctuations, must be sorted out before the superconducting pairing mechanism can be given a microscopic basis. C1 COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23187. CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20015. RP PICKETT, WE (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Cohen, Ronald/B-3784-2010; Singh, David/I-2416-2012; OI Cohen, Ronald/0000-0001-5871-2359; Krakauer, Henry/0000-0003-2517-0957 NR 79 TC 161 Z9 162 U1 2 U2 19 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JAN 3 PY 1992 VL 255 IS 5040 BP 46 EP 54 DI 10.1126/science.255.5040.46 PG 9 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GX791 UT WOS:A1992GX79100033 PM 17739913 ER PT J AU BUMGARNER, RL AF BUMGARNER, RL TI RADIUM EXPOSE IN UNITED-STATES MILITARY PERSONNEL - REPLY SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter RP BUMGARNER, RL (reprint author), USN,BUR MED & SURG,WASHINGTON,DC 20372, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD JAN 2 PY 1992 VL 326 IS 1 BP 71 EP 72 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA GX315 UT WOS:A1992GX31500029 ER PT B AU BROWN, LM DENALE, R AF BROWN, LM DENALE, R GP ASM INT TI REAL-TIME EVALUATION OF ULTRASONIC WELD INSPECTIONS SO 11TH INTERNATIONAL CONFERENCE AND EXHIBITS ON NDE IN THE NUCLEAR AND PRESSURE VESSEL INDUSTRIES LA English DT Proceedings Paper CT 11th International Conference and Exhibits on NDE in the Nuclear and Pressure Vessel Industries CY APR 30-MAY 02, 1992 CL ALBUQUERQUE, NM SP ASM INT, MAT TESTING & QUAL CONTROL DIV, NONDESTRUCT TESTING COMM, AMER SOC NONDESTRUCT TESTING, AMER WELDING SOC, ATOMIC ENERGY SOC JAPAN, BRIT INST NONDESTRUCT TESTING, DEUT GESELL ZERSTORUNGSFREIE PRUFUNG E V, EDISON WELDING INST, ELECT POWER RES INST, ASM INT, ENERGY DIV, JAPAN INST MET, LOS ALAMOS NATL LAB, SOC FRANCAISE MET & MAT, SOC FRANCAISE ENERGIE NUCL, MINERALS MET & MAT SOC C1 USN,CTR SURFACE WARFARE,ANNAPOLIS,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA 9503 KINSMAN RD, MATERIALS PARK, OH 44073 BN 0-87170-446-3 PY 1992 BP 333 EP 336 PG 4 WC Materials Science, Characterization & Testing; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA BA08L UT WOS:A1992BA08L00051 ER PT B AU GARRETT, SL HOFLER, TJ GARDNER, DL AF GARRETT, SL HOFLER, TJ GARDNER, DL BE Liizi, PZ TI THERMOACOUSTIC REFRIGERATION RESEARCH AT NPS SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 95 EP 96 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00027 ER PT J AU HARTMANN, B LEE, GF LEE, JD AF HARTMANN, B LEE, GF LEE, JD BE Liizi, PZ TI RELAXATION TIME RELATED TO MOLECULAR STRUCTURE IN POLYURETHANES SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN,CTR SURFACE WARFARE,POLYMER PHYS GRP,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 155 EP 156 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00057 ER PT J AU AU, WWL AF AU, WWL BE Liizi, PZ TI COMPARISON OF SONAR DISCRIMINATION BY AN ECHOLOCATING DOLPHIN AND A COUNTERPROPAGATION NEURAL NETWORK SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN,CTR OCEAN SYST,KAILUA,HI 96734. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 241 EP 242 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00100 ER PT J AU KORMAN, MS ROY, RA CRUM, LA AF KORMAN, MS ROY, RA CRUM, LA BE Liizi, PZ TI ENHANCEMENT OF HYDRODYNAMIC FLOW NOISE RADIATION BY THE REGULATION OF AIR BUBBLES IN A TURBULENT WATER JET SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 287 EP 288 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00123 ER PT J AU KATZ, RA MAXEY, M AF KATZ, RA MAXEY, M BE Liizi, PZ TI MECHANISMS UNDERLYING TRANSITIONAL AND TURBULENT BOUNDARY LAYER (TBL) FLOW-INDUCED NOISE IN UNDERWATER ACOUSTICS SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02840. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 301 EP 302 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00130 ER PT J AU SCHENCK, HA AF SCHENCK, HA BE Liizi, PZ TI THE EFFICIENT CALCULATION AND DISPLAY OF DISPERSION CURVES FOR A THIN CYLINDRICAL SHELL IMMERSED IN A FLUID SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RDT & E,SAN DIEGO,CA 92152. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 311 EP 312 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00135 ER PT J AU AU, WWL AF AU, WWL BE Liizi, PZ TI APPLICATION OF THE SONAR EQUATION TO DOLPHIN ECHOLOCATION SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN,CTR OCEAN SYST,KAILUA,HI 96734. NR 0 TC 0 Z9 0 U1 1 U2 1 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 1329 EP 1330 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00644 ER PT J AU YEN, NC AF YEN, NC BE Liizi, PZ TI DECOMPOSITION OF TIME-VARYING SIGNAL SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 1479 EP 1480 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00719 ER PT B AU GARDNER, DL BROWN, DA GARRETT, SL AF GARDNER, DL BROWN, DA GARRETT, SL BE Liizi, PZ TI FIBER-OPTIC PUSH-PULL ACOUSTIC SENSOR SYSTEMS RESEARCH AT NPS SO 14TH INTERNATIONAL CONGRESS ON ACOUSTICS, PROCEEDINGS, VOLS 1-4 LA English DT Proceedings Paper CT 14th International Congress on Acoustics (ICA 14) CY SEP 03-10, 1992 CL BEIJING, PEOPLES R CHINA SP INT UNION PURE & APPL PHYS, ACOUST SOC CHINA, ACADEMIA SINICA, INST ACOUST C1 USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIA SINICA INST ACOUSTICS PI BEIJING 100080 PA PROFESSOR WU WEI-FANG, BEIJING 100080, PEOPLES R CHINA PY 1992 BP 1623 EP 1624 PG 2 WC Acoustics; Architecture; Language & Linguistics; Mechanics; Music SC Acoustics; Architecture; Linguistics; Mechanics; Music GA BC62T UT WOS:A1992BC62T00790 ER PT J AU PRATER, DL STEVENS, MG LACKEY, JB AF PRATER, DL STEVENS, MG LACKEY, JB GP SOC EXPTL TEST PILOTS TI F/A-18 CONTROLS RELEASES DEPARTURE RECOVERY - FLIGHT TEST EVALUATION SO 1992 REPORT TO THE AEROSPACE PROFESSION, SETP 36TH SYMPOSIUM SE SYMPOSIUM PROCEEDINGS - SOCIETY OF EXPERIMENTAL TEST PILOTS LA English DT Proceedings Paper CT 36th Symposium of the Society-of-Experimental-Test-Pilots CY SEP, 1992 CL BEVERLY HILLS, CA SP SOC EXPTL TEST PILOTS C1 USN,CTR AIR WARFARE,DIV AIRCRAFT,STRIKE AIRCRAFT TEST DIRECTORATE,PATUXENT RIVER,MD 20670. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC EXPERIMENTAL TEST PILOTS PI LANCASTER PA PO BOX 986, LANCASTER, CA 93534 SN 0742-3705 J9 SYMP P SOC EXP T PIL PY 1992 BP 77 EP 96 PG 20 WC Engineering, Aerospace SC Engineering GA BA57A UT WOS:A1992BA57A00005 ER PT J AU HUFF, RW KESSLER, GK MUSSER, DE HONORS, OP AF HUFF, RW KESSLER, GK MUSSER, DE HONORS, OP GP SOC EXPTL TEST PILOTS TI F-14D FLIGHT DIRECTOR DEVELOPMENT, TEST, AND EVALUATION SO 1992 REPORT TO THE AEROSPACE PROFESSION, SETP 36TH SYMPOSIUM SE SYMPOSIUM PROCEEDINGS - SOCIETY OF EXPERIMENTAL TEST PILOTS LA English DT Proceedings Paper CT 36th Symposium of the Society-of-Experimental-Test-Pilots CY SEP, 1992 CL BEVERLY HILLS, CA SP SOC EXPTL TEST PILOTS C1 USN,CTR AIR WARFARE,DIV AIRCRAFT,FLIGHT TEST ENGN GRP,DEPT CARRIER SUITABIL,PATUXENT RIVER,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC EXPERIMENTAL TEST PILOTS PI LANCASTER PA PO BOX 986, LANCASTER, CA 93534 SN 0742-3705 J9 SYMP P SOC EXP T PIL PY 1992 BP 100 EP 110 PG 11 WC Engineering, Aerospace SC Engineering GA BA57A UT WOS:A1992BA57A00006 ER PT J AU STUCKY, M MEIER, M AF STUCKY, M MEIER, M GP SOC EXPTL TEST PILOTS TI DEVELOPMENTAL FLIGHT TEST OF AN ADVANCED FLEX-WING HANG GLIDER SO 1992 REPORT TO THE AEROSPACE PROFESSION, SETP 36TH SYMPOSIUM SE SYMPOSIUM PROCEEDINGS - SOCIETY OF EXPERIMENTAL TEST PILOTS LA English DT Proceedings Paper CT 36th Symposium of the Society-of-Experimental-Test-Pilots CY SEP, 1992 CL BEVERLY HILLS, CA SP SOC EXPTL TEST PILOTS C1 NAWS,CHINA LAKE,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC EXPERIMENTAL TEST PILOTS PI LANCASTER PA PO BOX 986, LANCASTER, CA 93534 SN 0742-3705 J9 SYMP P SOC EXP T PIL PY 1992 BP 232 EP 246 PG 15 WC Engineering, Aerospace SC Engineering GA BA57A UT WOS:A1992BA57A00015 ER PT B AU DELL, RF KEMPLE, WG TOVEY, CA AF DELL, RF KEMPLE, WG TOVEY, CA BE Klutke, GA Mitta, DA Nnaji, BO Seiford, LM TI HEURISTICALLY SOLVING THE STRATIGRAPHIC CORRELATION PROBLEM SO 1ST INDUSTRIAL ENGINEERING RESEARCH CONFERENCE PROCEEDINGS, 1992 LA English DT Proceedings Paper CT 1st Industrial Engineering Research Conference CY MAY 20-21, 1992 CL CHICAGO, IL C1 USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943. NR 0 TC 1 Z9 1 U1 0 U2 0 PU INST INDUSTRIAL ENGINEERS PI NORCROSS PA 25 TECHNOLOGY PARK/ATLANTA, NORCROSS, GA 30092 BN 0-89806-124-5 PY 1992 BP 293 EP 297 PG 5 WC Engineering, Industrial SC Engineering GA BB79J UT WOS:A1992BB79J00055 ER PT J AU LIGLER, FS KUSTERBECK, AW OGERT, RA WEMHOFF, GA AF LIGLER, FS KUSTERBECK, AW OGERT, RA WEMHOFF, GA TI DRUG DETECTION USING THE FLOW IMMUNOSENSOR SO ACS SYMPOSIUM SERIES LA English DT Review AB A detection system for small molecules has been developed which relies on the ability of antigen to displace fluorescent labelled antigen from antibody under flow conditions. The immunosensor responds in under a minute and is sensitive to pmoles of antigens. Antibodies to cocaine are incorporated into this system to exemplify its operational features. RP LIGLER, FS (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,SER 60901-255,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 3 TC 5 Z9 5 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0097-6156 J9 ACS SYM SER PY 1992 VL 511 BP 73 EP 80 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA KG218 UT WOS:A1992KG21800007 ER PT J AU STROEVE, P KOREN, R COLEMAN, LB STENGERSMITH, JD AF STROEVE, P KOREN, R COLEMAN, LB STENGERSMITH, JD TI FLUORINATED, MAIN-CHAIN CHROMOPHORIC POLYMER - LANGMUIR LAYER AND FOURIER-TRANSFORM INFRARED SPECTROSCOPIC STUDIES SO ACS SYMPOSIUM SERIES LA English DT Review ID HYDROPHILIC SPACER GROUPS; 2ND HARMONIC-GENERATION; THIN-FILM BEHAVIOR; BLODGETT-FILMS; POLY(METHYL METHACRYLATES); SIDE-CHAINS; MULTILAYERS; DYE AB A nonlinear optical polymer, which belongs to a new class of fluorinated, main-chain chromophoric polymers has been investigated by equilibrium isotherm studies of the Langmuir layer and FTIR studies of Langmuir-Blodgett films. The polymer arranges in an accordion-like manner on the air/water interface, when compressed to moderate surface pressures (12 mN m-1), and can be transferred in this configuration as Y-type LB multilayers. At higher surface pressures (> 12 mN m-1) the Langmuir layer forms either bilayers or rearranges structurally. The monolayer collapses irreversibly at 20-25 mN m-1. Analysis of FTIR studies confirm a accordion-like structure. A chemical change occurs in the polymer after aging for one day at the air/water interface. C1 UNIV CALIF DAVIS, ORGANIZED RES PROGRAM POLYMER ULTRATHIN FILM SYST, DAVIS, CA 95616 USA. UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA. USN, CTR WEAP, DEPT RES, CHINA LAKE, CA 93555 USA. RP UNIV CALIF DAVIS, DEPT CHEM ENGN, DAVIS, CA 95616 USA. NR 13 TC 1 Z9 1 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0097-6156 J9 ACS SYM SER JI ACS Symp. Ser. PY 1992 VL 493 BP 83 EP 93 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA JC228 UT WOS:A1992JC22800008 ER PT J AU HOOVER, JM HENRY, RA LINDSAY, GA NADLER, MP NEE, SF SELTZER, MD STENGERSMITH, JD AF HOOVER, JM HENRY, RA LINDSAY, GA NADLER, MP NEE, SF SELTZER, MD STENGERSMITH, JD TI LANGMUIR-BLODGETT MULTILAYERS OF FLUORINATED, MAIN-CHAIN CHROMOPHORIC, OPTICALLY NONLINEAR POLYMERS SO ACS SYMPOSIUM SERIES LA English DT Review ID 2ND-HARMONIC GENERATION; FILMS; HEMICYANINE AB Alternating copolymers of syndioregic (head-to-head), bis(alpha-cyanocinnamate) monomers and fluorinated diols have been synthesized, characterized and fabricated into Langmuir-Blodgett multilayer films that exhibit second-order nonlinear optical behavior. The regiospecific configuration of these novel polymers is intended to permit the polymer chains to fold in an accordion-like architecture at the air-water interface, thereby promoting the organization of the chromophores into a noncentrosymmetric monolayer assembly. Pressure-area isotherms for one of the samples gave an area per chromophore of less than 36 angstrom2 at a surface pressure of 10 mN/m. Multilayer films of up to 100 Y-type or 100 Z-type layers have been prepared, and both types of deposition yielded noncentrosymmetric films as indicated by second harmonic generation experiments at 1064 nm. RP HOOVER, JM (reprint author), USN,CTR WEAP,DEPT RES,CHINA LAKE,CA 93555, USA. NR 19 TC 2 Z9 2 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0097-6156 J9 ACS SYM SER PY 1992 VL 493 BP 94 EP 103 PG 10 WC Chemistry, Multidisciplinary SC Chemistry GA JC228 UT WOS:A1992JC22800009 ER PT J AU SAPERSTEIN, DD RABOLT, JF HOOVER, JM STROEVE, P AF SAPERSTEIN, DD RABOLT, JF HOOVER, JM STROEVE, P TI LANGMUIR-BLODGETT-FILMS OF STILBAZOLIUM CHLORIDE POLYETHERS - STRUCTURAL STUDIES SO ACS SYMPOSIUM SERIES LA English DT Review ID 2ND HARMONIC-GENERATION; 2ND-HARMONIC GENERATION; HEMICYANINE DYE; MULTILAYERS AB The orientation and order of Langmuir-Blodgett films of stilbazolium-epichlorohydrin polymer (PECH) interleaved with deuterated arachidic acid are studied with infrared radiation. Infrared absorption bands characteristics of the head and tail groups in both the dye and spacer are identified. Preliminary heating and aging studies show that the assembly undergoes a slow structural rearrangement at room temperature which is accelerated by heat. The observed rearrangement is consistent with previously measured SHG (second harmonic generation) signal loss in aged assemblies compared with freshly prepared samples. C1 IBM CORP,ALMADEN RES CTR,DIV RES,SAN JOSE,CA 95120. USN,CTR WEAP,DIV CHEM,CHINA LAKE,CA 93555. UNIV CALIF DAVIS,DEPT CHEM ENGN,DAVIS,CA 95616. UNIV CALIF DAVIS,ORGANIZED RES PROGRAM POLYMER ULTRATHIN FILM SYST,DAVIS,CA 95616. RP SAPERSTEIN, DD (reprint author), IBM CORP,DIV STORAGE SYST PROD,SAN JOSE,CA 95193, USA. NR 17 TC 3 Z9 3 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0097-6156 J9 ACS SYM SER PY 1992 VL 493 BP 104 EP 112 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA JC228 UT WOS:A1992JC22800010 ER PT J AU ELSAYED, SZ STEPHENS, FC AF ELSAYED, SZ STEPHENS, FC TI POTENTIAL EFFECTS OF INCREASED ULTRAVIOLET-RADIATION ON THE PRODUCTIVITY OF THE SOUTHERN-OCEAN SO ACS SYMPOSIUM SERIES LA English DT Review ID UV-B RADIATION; PHYTOPLANKTON; PHOTOINHIBITION; IMPACT; OZONE; PHOTOSYNTHESIS; ANTARCTICA; ORGANISMS AB A month-long study of the effects of ultraviolet radiation (UV) on phytoplankton and ice-algae collected from Arthur Harbor, Anvers Island, Antarctica, was carried out during November-December 1987. The parameters studied included: primary production rates, photosynthetic pigments and the photosynthesis-irradiance (P vs I) relation-ship. The results showed an enhancement of the photosynthetic rates when UV was excluded; conversely, production rates were lower under enhanced UV conditions. Significant changes in phytoplankton pigmentation also occurred as a result of changes in the UV levels. The implications of these findings to our understanding of the trophodynamics of the Southern Ocean and the bearing these have on global marine productivity are discussed. C1 USN, OCEANOG & ATMOSPHERE RES LAB, STENNIS SPACE CTR, BAY ST LOUIS, MS 39529 USA. RP ELSAYED, SZ (reprint author), TEXAS A&M UNIV SYST, DEPT OCEANOG, COLLEGE STN, TX 77843 USA. NR 45 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0097-6156 J9 ACS SYM SER JI ACS Symp. Ser. PY 1992 VL 483 BP 188 EP 206 PG 19 WC Chemistry, Multidisciplinary SC Chemistry GA HG426 UT WOS:A1992HG42600013 ER PT J AU PHIBBS, RH SHANNON, KM MENTZER, WC AF PHIBBS, RH SHANNON, KM MENTZER, WC TI POTENTIAL FOR TREATMENT OF ANEMIA OF PREMATURITY WITH RECOMBINANT-HUMAN-ERYTHROPOIETIN - PRELIMINARY-RESULTS SO ACTA HAEMATOLOGICA LA English DT Article; Proceedings Paper CT SATELLITE SYMP ON CURRENT AND POTENTIAL APPLICATIONS OF ERYTHROPOIETIN AT THE 11TH MEETING OF THE EUROPEAN AND AFRICAN DIVISION OF THE INTERNATIONAL SOC OF HAEMATOLOGY CY SEP 01, 1991 CL BASEL, SWITZERLAND SP INT SOC HAEMATOL, EUROPEAN & AFRICAN DIV, CILAG ORTHO BIOTECH DE ANEMIA OF PREMATURITY; ERYTHROPOIETIN, HUMAN RECOMBINANT ID ERYTHROID PROGENITORS; POSTNATAL CHANGES; ANEMIA; INFANTS; OXYGEN; LIVER AB There is a high level of erythropoiesis in the growing fetus. In utero relative hypoxia results in a relatively high haematocrit and predominant synthesis of haemoglobin F, with erythropoietin (EPO) produced in the liver regulating erythropoiesis. At birth after full-term pregnancy, fetal EPO concentrations are high, but decline progressively thereafter. In pre-term infants the expected postnatal decline in haemoglobin is more prolonged than in full-term infants and the premature infants may become anaemic. It has been shown in a randomized. double-blinded, placebo-controlled trial that recombinant human erythropoietin (r-HuEPO) at a dose of 100 U/kg given intravenously twice weekly for 6 weeks to infants with anaemia of prematurity produced an earlier increase in reticulocyte counts compared with placebo; however, the difference between treatments was not significant. r-HuEPO therapy did not suppress subsequent release of endogenous EPO. It is concluded that a higher dose of r-HuEPO may be required to treat anaemic premature infants. C1 USN HOSP,DEPT PEDIAT,OAKLAND,CA. RP PHIBBS, RH (reprint author), UNIV CALIF SAN FRANCISCO,CARDIOVASC RES INST,DEPT PEDIAT,BOX 0734,SAN FRANCISCO,CA 94143, USA. NR 24 TC 10 Z9 10 U1 0 U2 0 PU KARGER PI BASEL PA ALLSCHWILERSTRASSE 10, CH-4009 BASEL, SWITZERLAND SN 0001-5792 J9 ACTA HAEMATOL-BASEL JI Acta Haematol. PY 1992 VL 87 SU 1 BP 28 EP 33 PG 6 WC Hematology SC Hematology GA HU099 UT WOS:A1992HU09900008 PM 1574965 ER PT J AU BROCK, LM THOMAS, JP AF BROCK, LM THOMAS, JP TI THERMAL EFFECTS IN RUDIMENTARY CRACK EDGE INELASTIC ZONE GROWTH UNDER STRESS WAVE LOADING SO ACTA MECHANICA LA English DT Article ID TEMPERATURE RISE; RUNNING CRACK; TIP AB Inelastic zone growth at the edges of a pre-stressed crack due to stress-wave loading by diffraction is considered. The Dugdale zone model is used, and the surrounding material is a weakly-coupled thermoelastic solid. The growing zone acts as a heat flux site for the solid. A transient analysis for the brief period after zone growth initiation is performed and, for generality, the crack itself is allowed to extend. Expressions for the heat flux and the inelastic zone edge temperature rise are obtained, and show dependence on several important parameters. In particular, the temperature rise is enhanced by the presence of a pre-existing zone, yet varies inversely with the zone growth rate. This rise increases rapidly upon stress wave diffraction, but levels off at values on the order of those found in stress-state analyses. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BROCK, LM (reprint author), UNIV KENTUCKY,LEXINGTON,KY 40502, USA. NR 33 TC 7 Z9 7 U1 0 U2 0 PU SPRINGER-VERLAG WIEN PI VIENNA PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 VIENNA, AUSTRIA SN 0001-5970 J9 ACTA MECH JI Acta Mech. PY 1992 VL 93 IS 1-4 BP 223 EP 239 DI 10.1007/BF01182586 PG 17 WC Mechanics SC Mechanics GA HV282 UT WOS:A1992HV28200018 ER PT J AU DUESBERY, MS LOUAT, NP SADANANDA, K AF DUESBERY, MS LOUAT, NP SADANANDA, K TI THE MECHANICS AND ENERGETICS OF CROSS-SLIP SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID DISLOCATION SELF-INTERACTION; OROWAN STRESS; CRYSTALS AB Dislocation cross-slip plays an important part in many deformation processes, such as recovery, recrystallisation, creep and fatigue, but has never been treated theoretically except by approximate methods and within the line tension model. An accurate, numerical treatment of cross-slip, using the full self-stress dislocation model applied to face-centred cubic materials within a mesoscale, linear elastic framework is presented. Results are compared with experiment and with existing analytic approximations. The Friedel-Escaig model of cross-slip is found to be preferred over that due to Schoek and Seeger. It is shown further that the line tension model of cross-slip is inadequate, due to neglect of self-stress dipole forces. Good agreement is found with experimentally determined values of the critical stress and activation volume for cross-slip. It is argued that significant discrepancies between the theoretical and experimental orientation dependence of the cross-slip stress cast doubt on prevailing mechanistic theories. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP DUESBERY, MS (reprint author), FAIRFAX MAT RES INC, 5613 MARBLE ARCH WAY, ALEXANDRIA, VA 22310 USA. NR 34 TC 34 Z9 34 U1 3 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JAN PY 1992 VL 40 IS 1 BP 149 EP 158 DI 10.1016/0956-7151(92)90208-V PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GV804 UT WOS:A1992GV80400014 ER PT J AU RATH, BB AF RATH, BB TI CLATHRATES - UNTAPPED ENERGY BONANZA SO ADVANCED MATERIALS & PROCESSES LA English DT Article RP RATH, BB (reprint author), USN,RES LAB,MAT SCI & COMPONENT TECHNOL DIRECTORATE,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 0026-0665 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD JAN PY 1992 VL 141 IS 1 BP 15 EP 15 PG 1 WC Materials Science, Multidisciplinary SC Materials Science GA GY448 UT WOS:A1992GY44800003 ER PT J AU PRABHAKARA, MK AF PRABHAKARA, MK TI BUCKLING OF LAMINATED COMPOSITE PLATES AND SHELL PANELS WITH SOME FREE EDGES UNDER COMPRESSION AND SHEAR SO AERONAUTICAL JOURNAL LA English DT Article AB A general analytical solution for the buckling of laminated composite plates and shell panels for all combinations of free, simply supported and clamped edge conditions is presented. The solution is formulated in terms of stress function and transverse deflection. All the boundary conditions for the stress function are exactly satisfied. For the transverse deflection the prescribed boundary conditions are satisfied by including them in the expression for the energy integral. Several types of boundary conditions in which at least a pair of opposite edges of the panel are free and subjected to axial compression are considered. The Galerkin method, with beam vibration functions used as shape functions, is utilised to determine the buckling loads. The results obtained are used to examine the effect of bending-extensional coupling, aspect ratio and the curvature parameter on the buckling load. RP PRABHAKARA, MK (reprint author), USN,RES LAB,MECH MAT BRANCH,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ROYAL AERONAUTICAL SOC PI LONDON PA 4 HAMILTON PL, LONDON, ENGLAND W1V OBQ SN 0001-9240 J9 AERONAUT J JI Aeronaut. J. PD JAN PY 1992 VL 96 IS 951 BP 20 EP 26 PG 7 WC Engineering, Aerospace SC Engineering GA HC745 UT WOS:A1992HC74500004 ER PT J AU LOTH, E BAUM, J LOHNER, R AF LOTH, E BAUM, J LOHNER, R TI FORMATION OF SHOCKS WITHIN AXISYMMETRICAL NOZZLES SO AIAA JOURNAL LA English DT Note ID ELEMENT C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. RI Loth, Eric/C-5805-2008 NR 11 TC 6 Z9 6 U1 0 U2 1 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 JAN PY 1992 VL 30 IS 1 BP 268 EP 270 DI 10.2514/3.10909 PG 3 WC Engineering, Aerospace SC Engineering GA GZ915 UT WOS:A1992GZ91500035 ER PT B AU LEE, EW WALDMAN, JA WITTERS, JJ RIOJA, RJ DIVECHA, AP AF LEE, EW WALDMAN, JA WITTERS, JJ RIOJA, RJ DIVECHA, AP BE Peters, M Winkler, PJ TI DEVELOPMENT OF 2090 AND 8090 AL-LI ALLOYS FOR UNITED-STATES-NAVY AIRCRAFT SO ALUMINIUM-LITHIUM, VOLS 1 AND 2 LA English DT Proceedings Paper CT 6TH INTERNATIONAL ALUMINIUM-LITHIUM CONF CY OCT 07-11, 1991 CL GARMISCH PARTENKIRCHEN, GERMANY C1 USN, CTR AIR DEV, WARMINSTER, PA 18974 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU DGM METALLURGY INFORMATION PI NEW YORK PA 150 E 27TH ST, #1A, NEW YORK, NY 10016-9049 USA BN 3-88355-180-5 PY 1992 BP 1317 EP 1322 PG 6 WC Engineering, Multidisciplinary; Materials Science, Multidisciplinary SC Engineering; Materials Science GA BY20C UT WOS:A1992BY20C00206 ER PT J AU GULYA, AJ STEVENS, DM DUTKA, AJ CHRISTMAN, CL AF GULYA, AJ STEVENS, DM DUTKA, AJ CHRISTMAN, CL TI MORPHOLOGICAL AND ELECTROPHYSIOLOGIC EFFECTS OF COCHLEAR IMPLANTATION AND ELECTRICAL-STIMULATION SO AMERICAN JOURNAL OF OTOLOGY LA English DT Article ID GUINEA-PIG COCHLEA; ROUND WINDOW; RESPONSE AUDIOMETRY; PERILYMPH FISTULA; AUDITORY-NERVE; INDUCED DAMAGE; LONG-TERM; PERFORATION; EXPERIENCE AB The nondeafened guinea pig model was utilized in this study to assess the functional and morphologic effects of cochlear implantation and electrical stimulation. Auditory brainstem responses (ABRs) were recorded prior to and following intrascalar implantation of a 3M-House cochlear electrode (n = 41 ears), as well as after electrical stimulation (n = 23 ears). The experimental population was divided into the following groups according to implantation and stimulation parameters: 200-mu-A for 3 hours (group I); 200-mu-A for 24 hours (group II); 400-mu-A for 3 hours (group III); implanted, but not stimulated (group IV); and nonimplanted, not stimulated ears (group V). Of those cochleae that sustained the trauma of implantation, 32 percent had no detectable ABR to 110 dB SPL clicks, while only 7 percent additionally failed to respond to 130 dB SPL clicks. No significant difference (one-way ANOVA with repeated measures at the 95 percent confidence limit) could be detected when comparing those ears that retained ABRs according to experimental grouping. Morphologic analysis was performed on 29 cochleae. Spiral ganglion "packing densities" were not found to be significantly different among the groups (ANOVA). The status of the organ of Corti was significantly better in groups II and V in comparison to the other groups (Kruskal-Wallis test with pairwise comparisons, p < 0.05); there was no discernible dose-response relationship. Morphologic and electrophysiologic changes correlated with insertion trauma and infection rather than with electrical stimulation at the levels tested in this study. Future research will attempt to develop a computer algorithm that can quantify cochlear morphologic changes in response to implantation and electrical stimulation to improve the analysis of these effects. C1 USN,MED RES INST,BETHESDA,MD 20814. US FDA,CTR DEVICES & RADIOL HLTH,ROCKVILLE,MD. RP GULYA, AJ (reprint author), GEORGETOWN UNIV,MED CTR,3800 RESERVOIR RD NW,WASHINGTON,DC 20007, USA. NR 35 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0192-9763 J9 AM J OTOL JI Am. J. Otol. PD JAN PY 1992 VL 13 IS 1 BP 68 EP 73 PG 6 WC Otorhinolaryngology SC Otorhinolaryngology GA GY787 UT WOS:A1992GY78700014 PM 1598989 ER PT J AU SCOTT, DA CONSTANTINE, NT CALLAHAN, J BURANS, JP OLSON, JG ALFADEEL, M ALOZIEB, H AKUNKUMER, H HYAMS, KC AF SCOTT, DA CONSTANTINE, NT CALLAHAN, J BURANS, JP OLSON, JG ALFADEEL, M ALOZIEB, H AKUNKUMER, H HYAMS, KC TI THE EPIDEMIOLOGY OF HEPATITIS-C VIRUS-ANTIBODY IN YEMEN SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID NON-B-HEPATITIS; NON-A-HEPATITIS; HEPATOCELLULAR-CARCINOMA; VIRAL-HEPATITIS; BLOOD-DONORS; PREVALENCE; HEMOPHILIA; ETIOLOGY; ADULTS; EGYPT AB A cross-sectional survey of 348 subjects without evidence of liver disease was conducted to investigate the prevalence and risk factors for hepatitis C virus antibody (anti-HCV) seropositivity in the Yemen Arab Republic. The mean age of study subjects was 28.7 years (range 3-80), and 61% were males. Using commercial enzyme-linked immunosorbent assays (ELISA), 6.0% (95% confidence interval [CI] 3.8-9. 1) of subjects were anti-HCV-positive, 13.5% were hepatitis B surface antigen-positive (HBsAg-positive), and 51.4% were positive for at least one serologic marker of prior hepatitis B infection. Nine (2.6%; 95% CI 1.2-4.9) of the 21 ELISA-positive sera were confirmed to be anti-HCV positive by a recombinant immunoblot assay. Anti-HCV seropositivity was significantly associated with age (odds ratio [OR] 2.0 for each 10-year increase in age) and prior surgery (OR 10.1), but was not associated with a history of prior blood transfusion or markers of hepatitis B infection. These preliminary data suggest that hepatitis C may pose a substantial health threat in Yemen. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. MINIST HLTH,SANAA,YEMEN ARAB REP. USN,MED RES INST,BETHESDA,MD 20814. NR 32 TC 34 Z9 34 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 JAN PY 1992 VL 46 IS 1 BP 63 EP 68 PG 6 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA HF362 UT WOS:A1992HF36200011 PM 1311155 ER PT B AU GREFENSTETTE, JJ AF GREFENSTETTE, JJ BE Jantke, KP TI LEARNING DECISION STRATEGIES WITH GENETIC ALGORITHMS SO ANALOGICAL AND INDUCTIVE INFERENCE SE LECTURE NOTES IN ARTIFICIAL INTELLIGENCE LA English DT Proceedings Paper CT INTERNATIONAL WORKSHOP ON ANALOGICAL AND INDUCTIVE INFERENCE ( AII 92 ) CY OCT 05-09, 1992 CL DAGSTUHL CASTLE, GERMANY HO DAGSTUHL CASTLE RP GREFENSTETTE, JJ (reprint author), USN,RES LAB,NAVY CTR APPL RES ARTIFICIAL INTELLIGENCE,WASHINGTON,DC 20375, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER-VERLAG BERLIN PI BERLIN PA BERLIN BN 3-540-56004-1 J9 LECT NOTES ARTIF INT PY 1992 VL 642 BP 35 EP 50 PG 16 GA BX77P UT WOS:A1992BX77P00003 ER PT J AU SHRIVERLAKE, LC ANDERSON, GP GOLDEN, JP LIGLER, FS AF SHRIVERLAKE, LC ANDERSON, GP GOLDEN, JP LIGLER, FS TI THE EFFECT OF TAPERING THE OPTICAL FIBER ON EVANESCENT WAVE MEASUREMENTS SO ANALYTICAL LETTERS LA English DT Article DE EVANESCENT WAVE; FIBEROPTIC BIOSENSOR; FLUOROIMMUNOASSAY AB Optical biosensors are analytical tools employed in environmental, biotechnology and clinical fields. For remote evanescent wave detection with optical fibers, the majority of the fiber remains cladded while only a small portion of the core is exposed to perform the analysis. To improve the sensitivity of this type of fiber optic biosensor, tapering the sensing region of the fiber was investigated. Silica fibers were tapered into two geometries: step and continuous tapers. To determine the effect of tapering on detection levels, a fluoroimmunoassay was performed on fibers with nontapered, step-tapered and continuously tapered geometries. Solutions containing a fluorescent analyte were circulated over an antibody-coated fiber and the fluoresence signal measured. The minimum detection limit for fibers with 10 cm sensing region was 1.56 nM, 0.31 nM and 0. 16 nM for nontapered, step-tapered and continuously tapered fibers, respectively. Continuous tapering of the sensing region of an optical fiber offered a 10-fold increase in the sensitivity of the optical biosensor. RP SHRIVERLAKE, LC (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. RI Anderson, George/D-2461-2011 OI Anderson, George/0000-0001-7545-9893 NR 12 TC 31 Z9 33 U1 0 U2 5 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0003-2719 J9 ANAL LETT JI Anal. Lett. PY 1992 VL 25 IS 7 BP 1183 EP 1199 PG 17 WC Chemistry, Analytical SC Chemistry GA JA520 UT WOS:A1992JA52000002 ER PT J AU HONEYCHUCK, RV CRUGER, TW AF HONEYCHUCK, RV CRUGER, TW TI BEHAVIOR OF BUCKMINSTERFULLERENE (C60) IN CHLOROBENZENE WITH REGARD TO BEER LAW IN THE VISIBLE AND ULTRAVIOLET REGIONS SO ANALYTICAL LETTERS LA English DT Article DE ULTRAVIOLET VISIBLE; BUCKMINSTERFULLERENE; BEER LAW ID CARBON; FULLERENES; C-60; C70; SPECTRA; FORM AB The ultraviolet and visible absorption spectra of buckminsterfullerene have been recorded in chlorobenzene, from 288 nm to 820 nm, using a large concentration range (4.0 X 10(-6) to 2.5 X 10(-3) mol L-1). The molar absorptivity epsilon of the 334 nm peak, determined in a range which excludes the point of highest absorbance, is higher than values reported in hexane; it is 6.0 X 10(4) L mol-1 cm-1. Beer's Law plots of the data at 334 and 406 nm are very linear, falling off only at the highest concentration at 334 nm. The implications of these findings with reference to the possible aggregation of buckminsterfullerene are presented. C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. RP HONEYCHUCK, RV (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 12 TC 3 Z9 3 U1 1 U2 11 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0003-2719 J9 ANAL LETT JI Anal. Lett. PY 1992 VL 25 IS 9 BP 1755 EP 1763 PG 9 WC Chemistry, Analytical SC Chemistry GA JP213 UT WOS:A1992JP21300012 ER PT J AU OGERT, RA KUSTERBECK, AW WEMHOFF, GA BURKE, R LIGLER, FS AF OGERT, RA KUSTERBECK, AW WEMHOFF, GA BURKE, R LIGLER, FS TI DETECTION OF COCAINE USING THE FLOW IMMUNOSENSOR SO ANALYTICAL LETTERS LA English DT Article DE COCAINE DETECTION; IMMUNOSENSOR ID METABOLITE ASSAY; URINE; IMMUNOASSAY AB A continuous flow immunosensor has been designed for the detection of cocaine in aqueous samples. The continuous flow immunosensor relies on the displacement of fluorophore-labeled antigen from immobilized monoclonal antibody. The sensitivity and accuracy of the flow immunosensor were investigated while varying the parameters of immobilized antibody density, flow rate, amount of antibody-coated Sepharose used in each column, and the saturation of antibody binding sites with fluorophore-labeled antigen. Using a low density of immobilized anti-benzoylecgonine antibody, as little as 5 ng/ml cocaine could be detected. Small amounts of antibody-coated Sepharose could be used repeatedly and the lifetime of the column was proportional to the amount of Sepharose used. Results were obtained in less than a minute and cross-reactivity against various other drugs was negligible. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. NR 8 TC 34 Z9 34 U1 0 U2 0 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0003-2719 J9 ANAL LETT JI Anal. Lett. PY 1992 VL 25 IS 11 BP 1999 EP 2019 PG 21 WC Chemistry, Analytical SC Chemistry GA JW641 UT WOS:A1992JW64100002 ER PT J AU HULLANDER, M LEIVERS, D AF HULLANDER, M LEIVERS, D TI SPINAL CUTANEOUS FISTULA FOLLOWING CONTINUOUS SPINAL-ANESTHESIA SO ANESTHESIOLOGY LA English DT Article DE ANESTHESIA TECHNIQUE, SPINAL; CONTINUOUS; COMPLICATIONS, SPINAL CUTANEOUS FISTULA ID CEREBROSPINAL-FLUID LEAKAGE; LUMBAR PUNCTURE C1 USN HOSP,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. RP HULLANDER, M (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 15 TC 12 Z9 12 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 JAN PY 1992 VL 76 IS 1 BP 139 EP 140 DI 10.1097/00000542-199201000-00020 PG 2 WC Anesthesiology SC Anesthesiology GA GY980 UT WOS:A1992GY98000020 PM 1729918 ER PT J AU CROWLEY, JP VALERI, CR METZGER, JB PONO, L CHAZAN, J AF CROWLEY, JP VALERI, CR METZGER, JB PONO, L CHAZAN, J TI HEMOGLOBIN AND 2,3-DIPHOSPHOGLYCERATE LEVELS IN TRANSFUSED DIALYSIS PATIENTS WITH MYOCARDIAL-INFARCTION SO ANNALS OF CLINICAL AND LABORATORY SCIENCE LA English DT Article ID LEFT-VENTRICULAR FUNCTION; RENAL-DISEASE; ANEMIA; ABNORMALITIES; HEMODIALYSIS; FAILURE AB Thirty frequently transfused patients on long term hemodialysis were studied and a similar number of age and sex-matched patients who were infrequently transfused were used as a control group to ascertain the influence of a previous myocardial infarction (MI) on transfusion requirements. The freqency of previous MI on electrocardiogram (ECG) in the transfused and control groups was similar (40 percent and 37 percent, respectively). In frequently transfused dialysis patients with MI, the hemoglobin level (transfusion trigger) at which these patients were transfused was higher than that of frequently transfused patients without MI (8.3 +/- 1.5 g per dl vs. 6.9 +/- 1 g per dl, p < 0.01) which indicated that patients without MI tolerated a greater degree of anemia than those with MI. The 2,3-diphosphoglycerate (2,3-DPG) levels were significantly elevated in all transfused patients when compared to matched controls. However, levels of 2,3-DPG were significantly higher in MI patients receiving frequent transfusions than in other transfused patients, suggesting oxygen demands may not have been fully met despite the frequent transfusions. The results suggest levels of 2,3-DPG deserve further study in relation to the adequacy of tissue oxygenation in anemic dialysis patients. C1 RHODE ISL HOSP,DIV NEPHROL,PROVIDENCE,RI 02903. BROWN UNIV,DEPT MED,PROVIDENCE,RI 02903. ARTIFICIAL KIDNEY CTR RHODE ISL,PROVIDENCE,RI 02903. BOSTON UNIV,SCH MED,USN,BLOOD RES LAB,BOSTON,MA 02118. RP CROWLEY, JP (reprint author), RHODE ISL HOSP,DIV CLIN HEMATOL,593 EDDY ST,PROVIDENCE,RI 02903, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU INST CLINICAL SCIENCE INC PI PHILADELPHIA PA 1833 DELANCEY PLACE, PHILADELPHIA, PA 19103 SN 0091-7370 J9 ANN CLIN LAB SCI JI Ann. Clin. Lab. Sci. PD JAN-FEB PY 1992 VL 22 IS 1 BP 11 EP 17 PG 7 WC Medical Laboratory Technology SC Medical Laboratory Technology GA GY986 UT WOS:A1992GY98600002 PM 1739269 ER PT J AU PAPOULIAS, FA AF PAPOULIAS, FA TI GUIDANCE AND CONTROL LAWS FOR VEHICLE PATHKEEPING ALONG CURVED TRAJECTORIES SO APPLIED OCEAN RESEARCH LA English DT Article AB The problem of dynamic interactions between guidance and control schemes for autonomous ocean vehicles is studied. Emphasis is placed on the dynamic loss of stability of circular reference paths. The controller time constant and the guidance preview distance serve as the main bifurcation parameters. Hopf bifurcation theory techniques are used in order to establish stability of the fundamental harmonic response. Comparisons between line of sight and cross track error schemes are made and guidelines for more accurate vehicle operations are provided. RP PAPOULIAS, FA (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0141-1187 J9 APPL OCEAN RES JI Appl. Ocean Res. PY 1992 VL 14 IS 5 BP 291 EP 302 DI 10.1016/0141-1187(92)90033-G PG 12 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA KE305 UT WOS:A1992KE30500002 ER PT J AU SICA, L AF SICA, L TI IMAGE SPECKLE CONTRAST REDUCTION RESULTING FROM INTEGRATIVE SYNTHETIC APERTURE IMAGING SO APPLIED OPTICS LA English DT Article DE IMAGE SPECKLE; SPECKLE REDUCTION; SYNTHETIC APERTURE IMAGING AB Reduction of image speckle noise with the use of an integrative synthetic aperture imaging technique is studied. It is found that the Fourier inversion of the mutual intensity estimate (Appl. Opt. 30, 206-213 (1991)] yields an image intensity that corresponds exactly to the illumination of the object with partially coherent light from source optics imaging a delta-function incoherent source. An expression for the signal-to-noise ratio at an image point is derived for a large rough object with delta-function correlated amplitude reflection. A synthetic aperture system receiver of sufficiently small diameter yields image speckle with a signal-to-noise ratio (SNR) equal to 1. When the receiver and the transmitter diameters are equal, the SNR is 2 for linearly polarized speckle. The SNR continues to increase with receiver size and is linear in the diameter for large receiver-to-transmitter diameter ratios. RP SICA, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 6 Z9 6 U1 1 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JAN 1 PY 1992 VL 31 IS 1 BP 120 EP 125 PG 6 WC Optics SC Optics GA HA509 UT WOS:A1992HA50900018 PM 20717381 ER PT J AU ASCHER, H AF ASCHER, H TI COMPARISON OF NONPARAMETRIC ESTIMATORS FOR THE RENEWAL FUNCTION SO APPLIED STATISTICS-JOURNAL OF THE ROYAL STATISTICAL SOCIETY SERIES C LA English DT Letter RP ASCHER, H (reprint author), USN,RES LAB,CODE 5326-1,WASHINGTON,DC 20375, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL PUBL LTD PI OXFORD PA 108 COWLEY RD, OXFORD, OXON, ENGLAND OX4 1JF SN 0035-9254 J9 APPL STAT-J ROY ST C JI Appl. Stat.-J. R. Stat. Soc. PY 1992 VL 41 IS 3 BP 598 EP 600 PG 3 WC Statistics & Probability SC Mathematics GA HZ874 UT WOS:A1992HZ87400009 ER PT J AU GUETTER, HH AF GUETTER, HH TI PHOTOMETRIC STUDIES OF STARS IN THE YOUNG OPEN CLUSTER NGC-6823 SO ASTRONOMICAL JOURNAL LA English DT Article ID MASSIVE STARS; EVOLUTION AB CCD and photoelectric UBV photometry are presented for 32 stars in the nuclear and coronal regions of NGC 6823 and for 13 stars in its central trapezium system. The stars in the inner and outer regions of the cluster exhibit a wide range in their derived color excesses, while the computed reddenings for the trapezium stars are found to be very similar. Photometric data for 36 field stars towards the cluster indicates that about 0.6 mag of absorption is due to foreground interstellar material. From near-IR photometry, the reddening law is found to be uniform across the cluster and is characterized by R(v) = 3.2. Using the ZAMS fitting procedure and by assuming a distance of the Hyades of 3.3 mag, a mean reddening corrected distance to NGC 6823 of 2.1 +/- 0.1 kpc is obtained. An age range between 2 and 11 x 10(6) yr is found for the cluster stars. The trapezium stars are the youngest, the nuclear objects have intermediate ages, and the stars in the corona are the oldest. RP GUETTER, HH (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 30 TC 19 Z9 19 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 JAN PY 1992 VL 103 IS 1 BP 197 EP 203 DI 10.1086/116052 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GX221 UT WOS:A1992GX22100017 ER PT J AU FEY, AL CLAUSSEN, MJ GAUME, RA NEDOLUHA, GE JOHNSTON, KJ AF FEY, AL CLAUSSEN, MJ GAUME, RA NEDOLUHA, GE JOHNSTON, KJ TI THE RADIO APPEARANCE OF COMPACT H II REGIONS - VLA OBSERVATIONS OF G31.28+0.06, G33.92+0.11, AND G34.25+0.14 SO ASTRONOMICAL JOURNAL LA English DT Article ID AMMONIA; MASERS; EMISSION; PHASE; LINE; H2O; OH AB We present multifrequency VLA continuum and spectral line observations of the three H II regions G31.28 + 0.06, G33.92 + 0.11, and G34.25 + 0.14. Our observations emphasize the importance of resolution effects in any scheme of classifying H II regions on the basis of observed morphology. The continuum images of G31.28 + 0.06 at 20 and 3.6 cm show a cometary morphology, whereas the combination of resolution and sensitivity of the 6 cm image shows that G31.28 + 0.06 is actually a shell source with the continuum emission from one part of the shell dominating the emission from the rest of the shell. Hydroxyl and water masers are projected off the edge of the brightest part of the shell. The high resolution (5".5) 20 cm continuum emission from G33.92 + 0.11 presented here shows a shell source whose continuum emission is dominated by one side of the shell. This H II region was originally classified as a core-halo source by Wood & Churchwell [ApJS, 69, 831 (1989)] and appears to have cometary morphology in our 6 and 3.6 cm images. Our 20 cm image of the G34.3 + 0.2 region details the continuum emission from two H II regions, G34.25 + 0.14, and the well studied "cometary" H II region G34.26 + 0.15. Our image of G34.25 + 0.14 shows a ring of emission of diameter approximately 1'. This structure appears to be a shell which is 75% complete. While the source is too large to be considered an ultracompact H II region, the morphology of the emission has important ramifications for models of the nearby cometary H II region. Both G34.25 + 0.14 and G34.26 + 0.15 are embedded in a 1'-2' NH3 core whose temperature and density peak at a point between the two H II regions. The brightest parts of both G34.25 + 0.14 and G34.26 + 0.15 are in the direction of the ultracompact molecular core. This argues against a bow shock interpretation for the H II regions since the bow shock model, applied to these H II regions, would require the unlikely circumstance that both regions are moving into a preexisting ultracompact molecular core. We suggest that the observed properties of both regions can be explained by expansion in an anisotropic medium. Density gradients in the ambient molecular cloud would slow the expansion of the H II regions in the direction of highest density. RP FEY, AL (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4210,WASHINGTON,DC 20375, USA. NR 27 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 JAN PY 1992 VL 103 IS 1 BP 234 EP 242 DI 10.1086/116056 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GX221 UT WOS:A1992GX22100021 ER PT J AU NEDOLUHA, GE WATSON, WD AF NEDOLUHA, GE WATSON, WD TI THE ZEEMAN EFFECT IN ASTROPHYSICAL WATER MASERS AND THE OBSERVATION OF STRONG MAGNETIC-FIELDS IN REGIONS OF STAR FORMATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; ISM, MAGNETIC FIELDS; MASERS; POLARIZATION; STARS, FORMATION ID LINEARLY POLARIZED RADIATION; ASTRONOMICAL MASERS AB The transfer equations for the polarized radiation of astrophysical, 22 GHz water masers are solved in the presence of a magnetic field which causes a Zeeman splitting that is much smaller than the spectral line breadth. We focus upon the relationship between the recently detected circular polarization in this maser radiation and the strength of the magnetic field. In initial assessments, others have found that the observed polarization is indicative of the strongest magnetic fields yet detected in regions of star formation (congruent-to 50 mG). In these estimates for the magnetic field, important ways in which the transfer of the 22 GHz maser radiation differs from the transfer of nonmaser radiation due to a single transition have not been considered. These include the narrowing and rebroadening of the spectral line with increasing optical depth, the merging of hyperfine components, deviations of the molecular velocities from a Maxwellian distribution, unequal populations of the magnetic substates, the influence of cross-relaxation, and the generation of circularly polarized radiation due to changes in direction of the linear polarization. Major uncertainties in the inferred strengths of the magnetic fields due to these considerations tend to occur mostly when the flux of maser radiation is high and the maser is saturated. The observed spectral line breadths are found to be good indicators of whether the radiative flux is high enough that such effects are significant. For example, when the breadth is smaller than about 0.8 km s-1 (FWHM), we calculate that the uncertainty is less than a factor of about 2. The accuracy is improved significantly when the angle between the line of sight and the direction of the magnetic field does not exceed approximately 45-degrees. Our "best values" for the strengths of the inferred magnetic fields are about 2/3 of those obtained previously. For the maser fluxes and for the magnetic field strengths believed to be relevant, the Zeeman frequency is much greater than the rate for stimulated emission. The calculations here are performed with approximations appropriate for this regime. Uncertainty in the strength of the magnetic field due to lack of knowledge about which hyperfine transition is the source of the 22 GHz masers is removed. The 22 GHz maser feature is found to be the result of a merger of the three strongest hyperfine components. The merger itself introduces little uncertainty. This over-lapping of the hyperfine components, by itself, causes the profile for the net circular polarization (i.e., the Stokes V parameter) to be quite asymmetric. One sense of the circular polarization tends to dominate. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. UNIV ILLINOIS,DEPT ASTRON,URBANA,IL 61801. RP NEDOLUHA, GE (reprint author), USN,RES LAB,NATL RES COUNCIL,CODE 4210,WASHINGTON,DC 20375, USA. NR 22 TC 52 Z9 52 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 JAN 1 PY 1992 VL 384 IS 1 BP 185 EP 196 DI 10.1086/170862 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GW612 UT WOS:A1992GW61200018 ER PT J AU SEAVER, M PEELE, JR RUBEL, GO AF SEAVER, M PEELE, JR RUBEL, GO TI GAS SCAVENGING OF INSOLUBLE VAPORS - CONDENSATION OF METHYL SALICYLATE VAPOR ONTO EVAPORATING DROPS OF WATER SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE WATER DROP EVAPORATION; HENRY LAW; INSOLUBLE ORGANIC VAPOR; GAS SCAVENGING ID WIND-TUNNEL AB We have observed the evaporation of acoustically levitated water drops at 0 and 32% relative humidity in a moving gas stream which is nearly saturated with methyl salicylate vapor. The initial evaporation rate is characteristic of a pure water drop and gradually slows until the evaporation rate becomes that of pure methyl salicylate. The quantity of condensed methyl salicylate exceeds its Henry's law solubility in water by factors of more than 30-50. This apparent violation of Henry's law agrees with the concentration enhancements in the liquid phase found by Glotfelty et al. (1987, Nature 235,602-605) during their field measurements of organophorus pesticides in fog water. Under our conditions, visual evidence demonstrates the presence of two liquid phases, thus invalidating the use of Henry's law. A continuum evaporation-condensation model for an immiscible two-component system which accounts for evaporative self-cooling of the drop correctly predicts the amount of methyl salicylate condensed onto the water drops. C1 USA,ARMAMENT MUNIT & CHEM COMMAND,CTR CHEM RES DEV & ENGN,ABERDEEN PROVING GROUND,MD 21010. RP SEAVER, M (reprint author), USN,RES LAB,CODE 6540,WASHINGTON,DC 20375, USA. NR 8 TC 2 Z9 2 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PY 1992 VL 26 IS 2 BP 205 EP 209 DI 10.1016/0960-1686(92)90301-Z PG 5 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA GR453 UT WOS:A1992GR45300001 ER PT J AU FLIPPENANDERSON, JL GILARDI, RD PITT, AM WILSON, WS AF FLIPPENANDERSON, JL GILARDI, RD PITT, AM WILSON, WS TI SYNTHESIS AND EXPLOSIVE PROPERTIES OF BENZOTRIAZOLES SO AUSTRALIAN JOURNAL OF CHEMISTRY LA English DT Article ID POLYNITRO COMPOUNDS; OXIDATION AB Treatment of nitro-substituted 2-aminodiphenylamines in acetic acid with either nitric acid or nitrous acid yielded nitro-substituted 1-phenylbenzotriazoles, which may be further nitrated with nitric or mixed acid. These materials have been examined as potential energetic materials, with particular reference to their densities, calculated explosive properties and sensitiveness, especially impact sensitivity. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. PHYS CHEM DIV,MAT RES LABS,ASCOT,VIC 3032,AUSTRALIA. NR 20 TC 9 Z9 9 U1 1 U2 3 PU C S I R O PUBLICATIONS PI COLLINGWOOD PA 150 OXFORD ST, PO BOX 1139, COLLINGWOOD VICTORIA 3066, AUSTRALIA SN 0004-9425 J9 AUST J CHEM JI Aust. J. Chem. PY 1992 VL 45 IS 3 BP 513 EP 524 PG 12 WC Chemistry, Multidisciplinary SC Chemistry GA HF977 UT WOS:A1992HF97700002 ER PT J AU FREYER, AJ LOWEMA, CK NISSAN, RA WILSON, WS AF FREYER, AJ LOWEMA, CK NISSAN, RA WILSON, WS TI SYNTHESIS AND EXPLOSIVE PROPERTIES OF DINITROPICRYLBENZIMIDAZOLES, AND THE TRIGGER LINKAGE IN DINITROPICRYLBENZOTRIAZOLES SO AUSTRALIAN JOURNAL OF CHEMISTRY LA English DT Article AB The synthesis of certain dinitropicrylbenzimidazoles and their structural elucidation are described. The explosive properties axe discussed, and compared with those of the corresponding benzotriazoles. These comparisons allow the identification of the Pic-N-N = N moiety as containing the 'trigger linkage' for impact initiation of picrylbenzotriazoles. C1 USN,CTR WEAP,DIV CHEM,CHINA LAKE,CA 93555. PENN STATE UNIV,DEPT CHEM,UNIVERSITY PK,PA 16802. DEPT DEF,MAT RES LABS,ASCOT,VIC 3032,AUSTRALIA. NR 16 TC 10 Z9 10 U1 0 U2 0 PU C S I R O PUBLICATIONS PI COLLINGWOOD PA 150 OXFORD ST, PO BOX 1139, COLLINGWOOD VICTORIA 3066, AUSTRALIA SN 0004-9425 J9 AUST J CHEM JI Aust. J. Chem. PY 1992 VL 45 IS 3 BP 525 EP 539 PG 15 WC Chemistry, Multidisciplinary SC Chemistry GA HF977 UT WOS:A1992HF97700003 ER PT J AU MAWN, SV LAMBERT, JJ CATYB, JL AF MAWN, SV LAMBERT, JJ CATYB, JL TI THE RELATIONSHIP BETWEEN HEAD AND NECK ANTHROPOMETRY AND KINEMATIC RESPONSE DURING IMPACT-ACCELERATION SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID SPINE AB Research on the effects of impact acceleration on the body, primarily the head and neck, has been conducted at the U.S. Naval Biodynamics Laboratory for nearly two decades. Over 150 Navy enlisted men have been subjected to impact acceleration on a sled propelled by a nitrogen-powered horizontal accelerator. Their head and neck kinematic responses during the experimental impact were measured and stored in automated data bases. Similarly, anthropometric measurements were recorded for these subjects. To investigate the relation between head and neck anthropometry and response to impact acceleration, tests involving 15 subjects were selected. A strong relation was found between head and neck anthropometry and linear acceleration of the head along the Z axis. Lesser correlations were determined between the anthropometric measurements and linear acceleration along the X axis and angular acceleration about the Y axis. These findings are potentially applicable to areas such as aircrew selection, physical training and protective equipment development. C1 USN,BIODYNAM LAB,NEW ORLEANS,LA. NR 18 TC 3 Z9 3 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD JAN PY 1992 VL 63 IS 1 BP 32 EP 36 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GY245 UT WOS:A1992GY24500006 PM 1550531 ER PT J AU YACAVONE, DW BOROWSKY, MS BASON, R ALKOV, RA AF YACAVONE, DW BOROWSKY, MS BASON, R ALKOV, RA TI FLIGHT EXPERIENCE AND THE LIKELIHOOD OF UNITED-STATES-NAVY AIRCRAFT MISHAPS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note AB Although the flight experience level of U.S. Navy pilots has not declined in recent years, current budget constraints will eventually lead to reductions in flight hours per pilot. This implies an eventual shifting of the distribution of flight hours. Analyses show that the rate of aircrew factor and pilot error mishaps tends to decrease as pilots' flight experience in model increases. Aviation loss rates are higher during a pilot's first 500 hours in model. This seems to be true no matter if the pilot is simply inexperienced overall or a highly experienced aviator transitioning to a different aircraft. These data suggest, therefore, that if the in-model experience levels of naval aviators decline sufficiently, the mishap rate will increase. RP YACAVONE, DW (reprint author), USN,CTR SAFETY,DIV AEROMED,NAVAL AIR STN,NORFOLK,VA 23511, USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD JAN PY 1992 VL 63 IS 1 BP 72 EP 74 PG 3 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GY245 UT WOS:A1992GY24500013 PM 1550538 ER PT B AU BERGER, AE AF BERGER, AE BE Miller, JJH TI A BOUNDARY-LAYER IN A SINGULAR DIFFUSION PROBLEM ARISING FROM A MODEL FOR CALCULATING MAGNETICALLY INDUCED ELECTRON CURRENTS IN A MOLECULE SO BAIL VI: PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON BOUNDARY AND INTERIOR LAYERS - COMPUTATIONAL AND ASYMPTOTIC METHODS LA English DT Proceedings Paper CT 6th International Conference on Boundary and Interior Layers - Computational and Asymptotic Methods CY AUG 18-20, 1992 CL COPPER MT, CO C1 USN,SURFACE WARFARE,DAHLGREN DIV,INFORMAT & MATH SCI BRANCH,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FRONT RANGE PRESS INC PI COPPER MT PA PO BOX 3162, COPPER MT, CO 80443-3162 BN 0-9631678-1-2 PY 1992 BP 94 EP 94 PG 1 WC Mathematics, Applied; Mechanics SC Mathematics; Mechanics GA BA43G UT WOS:A1992BA43G00036 ER PT J AU Alberte, RS Snyder, S Zahuranec, BJ Whetstone, M AF Alberte, Randall S. Snyder, Stephen Zahuranec, Bernard J. Whetstone, Marc TI BIOFOULING RESEARCH NEEDS FOR THE UNITED STATES NAVY: PROGRAM HISTORY AND GOALS SO BIOFOULING LA English DT Editorial Material DE biofouling; biofilms; vinyl resin-based AF; SPC AF; TBT-based AF; ablative copper AF C1 [Alberte, Randall S.; Snyder, Stephen] Off Naval Res, Program Mol Biol, Arlington, VA 22217 USA. [Zahuranec, Bernard J.] Off Naval Res, Ocean Biol Program, Arlington, VA 22217 USA. [Whetstone, Marc] Off Naval Res, Publ Affairs Off, Arlington, VA 22217 USA. RP Alberte, RS (reprint author), Off Naval Res, Program Mol Biol, 800 N Quincy St, Arlington, VA 22217 USA. NR 0 TC 59 Z9 66 U1 2 U2 13 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0892-7014 J9 BIOFOULING JI Biofouling PY 1992 VL 6 IS 2 SI SI BP 91 EP 95 DI 10.1080/08927019209386214 PG 5 WC Biotechnology & Applied Microbiology; Marine & Freshwater Biology SC Biotechnology & Applied Microbiology; Marine & Freshwater Biology GA V22AT UT WOS:000208248800001 ER PT J AU Swain, GW Griffith, JR Bultman, JD Vincent, HL AF Swain, G. W. Griffith, J. R. Bultman, J. D. Vincent, H. L. TI THE USE OF BARNACLE ADHESION MEASUREMENTS FOR THE FIELD EVALUATION OF NON-TOXIC FOUL RELEASE SURFACES SO BIOFOULING LA English DT Article DE barnacle; barnacle adhesion measurements; factors influencing barnacle adhesion; biofouling release surfaces; antifouling testing AB Barnacle adhesion measurements provide an excellent method of assessing the foul release characteristics of non-toxic surfaces. This paper describes both tensile and shear force methods that have been developed for field applications. Selected data are presented and the results discussed with respect to the variables that affect the observed adhesion values. C1 [Swain, G. W.] Florida Inst Technol, Dept Oceanog & Ocean Engn, Melbourne, FL 32901 USA. [Griffith, J. R.; Bultman, J. D.] USN, Res Lab, Washington, DC 20375 USA. [Vincent, H. L.] Dow Corning Corp, Midland, MI 48686 USA. RP Swain, GW (reprint author), Florida Inst Technol, Dept Oceanog & Ocean Engn, 150 W Univ Blvd, Melbourne, FL 32901 USA. FU Office of Naval Research; Dow Corning Corporation FX The authors would like to acknowledge the Office of Naval Research and Dow Corning Corporation for their support in the development of adhesion testing methodologies. They would also like to thank Dr Ira Rubinoff, Smithsonian Tropical Research Institute, Panama for making facilities available for static immersion testing of the surfaces; Dr William A Newman (Scripps Institution of Oceanography) and Jorge Laguna (Florida Department of Natural Resources) for barnacle identification; and Mike Schultz of the Florida Institute of Technology for helping to develop the shear test method. NR 16 TC 50 Z9 51 U1 1 U2 13 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0892-7014 J9 BIOFOULING JI Biofouling PY 1992 VL 6 IS 2 SI SI BP 105 EP 114 DI 10.1080/08927019209386216 PG 10 WC Biotechnology & Applied Microbiology; Marine & Freshwater Biology SC Biotechnology & Applied Microbiology; Marine & Freshwater Biology GA V22AT UT WOS:000208248800003 ER PT J AU Price, RR Patchan, M Clare, A Rittschof, D Bonaventura, J AF Price, Ronald R. Patchan, Marcia Clare, Anthony Rittschof, Dan Bonaventura, Joe TI PERFORMANCE ENHANCEMENT OF NATURAL ANTIFOULING COMPOUNDS AND THEIR ANALOGS THROUGH MICROENCAPSULATION AND CONTROLLED RELEASE SO BIOFOULING LA English DT Article DE antifouling; controlled release; microencapsulation; natural products AB Microencapsulation of natural antifouling compounds and their subsequent inclusion in polymeric coatings is a viable alternative to self-polishing polymeric paint or rosin-based ablative coatings. However, as naturally occurring compounds, the crude extracts of Octocorals (Renilla reniformis) or Pukalides, while found to be effective agents, are subject to both photolysis and chemical degradation in the marine environment. For these compounds to provide a viable alternative to persistent metallic toxicants such as organotins, they must be stabilized in the coating and released at their minimum effective dosages to provide for long term biofouling control. Enhanced activity of these biocides is reported, as demonstrated by their ability to repel the settlement of marine fouling organisms in short term testing at Beaufort, NC, Pearl Harbor and Coconut Island Hawaii. These assays, conducted over periods of 30 to 160 d, indicate that natural extracts are capable of repelling settlement to a greater degree when entrapped in cylindrical microstructures than when free associated into a polymeric film, or physically immobilized in a self-polishing co-polymeric paint. C1 [Price, Ronald R.; Patchan, Marcia] USN, Res Lab, Ctr Bio Mol Engn, Washington, DC 20375 USA. [Clare, Anthony; Rittschof, Dan; Bonaventura, Joe] Duke Univ, Marine Lab, Beaufort, NC 28516 USA. RP Price, RR (reprint author), USN, Res Lab, Ctr Bio Mol Engn, Washington, DC 20375 USA. OI Clare, Anthony/0000-0002-7692-9583 FU Office of Naval Research; Office of Naval Technology FX This work has been supported by the Office of Naval Research and the Office of Naval Technology. We are grateful for the assistance of Diedrie Roberts of Duke University for advice on renillafoulin (extract) as well as proprietary analogs, and for environmental settlement testing. Data collection for Pearl Harbor were provided by Treena Michaels and Dr Linda Walters and analysis by Dr Celia Smith of the University of Hawaii. We are also grateful for the editorial support of Kathy Price, Smithsonian Institution. NR 17 TC 33 Z9 33 U1 3 U2 12 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 4 PARK SQUARE, MILTON PARK, ABINGDON OX14 4RN, OXON, ENGLAND SN 0892-7014 J9 BIOFOULING JI Biofouling PY 1992 VL 6 IS 2 SI SI BP 207 EP 216 DI 10.1080/08927019209386223 PG 10 WC Biotechnology & Applied Microbiology; Marine & Freshwater Biology SC Biotechnology & Applied Microbiology; Marine & Freshwater Biology GA V22AT UT WOS:000208248800010 ER PT B AU OLSEN, RG AF OLSEN, RG BE MAGIN, RL LIBURDY, RP PERSSON, B TI DEVELOPMENT OF DOSIMETRY MONITORS FOR MRI STAFF AND PATIENTS SO BIOLOGICAL EFFECTS AND SAFETY ASPECTS OF NUCLEAR MAGNETIC RESONANCE IMAGING AND SPECTROSCOPY SE ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Proceedings Paper CT CONF ON BIOLOGICAL EFFECTS AND SAFETY ASPECTS OF NUCLEAR MAGNETIC RESONANCE IMAGING AND SPECTROSCOPY CY MAY 15-17, 1991 CL BETHESDA, MD SP NEW YORK ACAD SCI, NCI, FDA, BERLEX LABS, BRISTOL MYERS SQUIBB PHARM RES INST, SOC MAGNET RESONANCE IMAGING RP OLSEN, RG (reprint author), USN,AEROSP MED RES LAB,DIV BIOENGN,PENSACOLA,FL 32508, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA NEW YORK BN 0-89766-698-4 J9 ANN NY ACAD SCI JI Ann.NY Acad.Sci. PY 1992 VL 649 BP 237 EP 241 DI 10.1111/j.1749-6632.1992.tb49612.x PG 5 WC Radiology, Nuclear Medicine & Medical Imaging; Spectroscopy SC Radiology, Nuclear Medicine & Medical Imaging; Spectroscopy GA BW41Q UT WOS:A1992BW41Q00018 PM 1580496 ER PT J AU RUDOLPH, AS STILWELL, G CLIFF, RO KAHN, B SPARGO, BJ ROLLWAGEN, F MONROY, RL AF RUDOLPH, AS STILWELL, G CLIFF, RO KAHN, B SPARGO, BJ ROLLWAGEN, F MONROY, RL TI BIOCOMPATIBILITY OF LIPID MICROCYLINDERS - EFFECT ON CELL-GROWTH AND ANTIGEN PRESENTATION IN CULTURE SO BIOMATERIALS LA English DT Article DE LIPID MICROCYLINDERS; T-CELL RESPONSE; MACROPHAGES ID ENCAPSULATED HEMOGLOBIN; SUSTAINED-RELEASE; LIPOSOMES; PHOSPHATIDYLCHOLINE; VESICLES; MICROSTRUCTURES; BEHAVIOR; INVIVO; BLOOD AB The authors are developing a lipid-based microcylinder for the controlled release of biological response modifiers and as templates for cellular migration and differentiation. These structures are comprised of a photopolymerizable phosphatidylcholine (1,2-ditricosa-10,12-diynoyl-sn-glycero-3-phosphocholine) and form spontaneously as a result of a thermotropic phase transition in aqueous solution or in a cosolvent solution of 70:30 ethanol:water. The hollow cylinders are helically wrapped lipid bilayers, variable in length (50-25 mum, depending on conditions of formation) and are 0.5-1.0 mum in diameter. The interaction has been examined of three types of lipid microcylinders: (1) monomeric, (2) photopolymerized by exposure to 254 nm light, and (3) surface-modified by incorporation of 6 mol% gangliosides, with different human cell lines and peripheral blood leucocytes to evaluate the biocompatibility of these structures. The proliferative status of U937 (a histiocytic monocyte), K562 (an erythroleukaemic cell), and Jurkat's derivative (a T-lymphoblast) as measured by pulsed tritiated thymidine was unaffected by the presence of up to 100 mug/ml of lipid microcylinders after 3 d in culture. Adherent human peripheral blood monocytes were shown to form adhesive contacts with the lipid microcylinders. An 'association' index from this interaction shows that after 3 d in culture, the association was much lower for those microcylinders that had incorporated ganglioside compared with monomeric or polymerized structures. The lipid microcylinders do not activate T-cells isolated from human peripheral blood, nor do they inhibit the activation of T-cells by phorbol esters or other mitogens. Moderate concentration-dependent inhibition of the specific antigenic T-cell response to tetanus toxoid by the lipid microcylinders was observed. This result suggests that the interference may be at the level of the antigen-presenting cell. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. USN,MED RES INST,BETHESDA,MD 20889. RP RUDOLPH, AS (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 26 TC 14 Z9 14 U1 1 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0142-9612 J9 BIOMATERIALS JI Biomaterials PY 1992 VL 13 IS 15 BP 1085 EP 1092 DI 10.1016/0142-9612(92)90141-A PG 8 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA KD007 UT WOS:A1992KD00700005 PM 1493192 ER PT J AU CLIFF, RO LIGLER, F GOINS, B HOFFMANN, PM SPIELBERG, H RUDOLPH, AS AF CLIFF, RO LIGLER, F GOINS, B HOFFMANN, PM SPIELBERG, H RUDOLPH, AS TI LIPOSOME ENCAPSULATED HEMOGLOBIN - LONG-TERM STORAGE STABILITY AND INVIVO CHARACTERIZATION SO BIOMATERIALS ARTIFICIAL CELLS AND IMMOBILIZATION BIOTECHNOLOGY LA English DT Article ID FREEZE-DRIED LIPOSOMES; BLOOD SUBSTITUTE; PRESERVATION; TREHALOSE; RESPONSES; SYSTEM; RAT AB Liposome Encapsulated Hemoglobin (LEH) has been the focus of research and development at the Naval Research Laboratory in an effort to find a viable oxygen-carrying resuscitative fluid. Previous reports from our laboratory have shown that LEH binds and releases oxygen in a manner similar to red blood cells, and that it can sustain life when red cell hematocrits are decreased to critical levels. We have also reported on LEH with regards to preparative methods, scale-up feasibility, toxicity, hemodynamics, hemoglobin P50 modification by coencapsulation of organic phosphates, liposomal surface modification, and storage strategies. In this report, the issue of LEH efficacy following long-term storage in the dry state will be addressed. We have shown that hemoglobin, liposomes, and LEH may be successfully lyophilized and rehydrated to viable states. The modification of the LEH formulation by addition of the carbohydrate trehalose results in the successful lyophilization and storage of LEH. In vitro characterization of LEH stored in the dry state for up to six months includes measurement of oxygen-carrying capacity, liposome size retention, methemoglobin production, and the intraliposomal hemoglobin concentration. The in vivo studies report on physiological parameters such as circulation persistence, blood chemistry, and pathological examination in mice. C1 GEORGETOWN UNIV,DEPT BIOCHEM,WASHINGTON,DC 20057. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP CLIFF, RO (reprint author), GEOCENTERS INC,FT WASHINGTON,MD, USA. RI Goins, Beth/F-1311-2010 NR 22 TC 14 Z9 14 U1 0 U2 1 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 1055-7172 J9 BIOMAT ARTIF CELL IM JI Biomater. Artif. Cells Immobil. Biotechnol. PY 1992 VL 20 IS 2-4 BP 619 EP 626 PG 8 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA JM745 UT WOS:A1992JM74500058 PM 1391485 ER PT J AU PHILLIPS, WT RUDOLPH, AS GOINS, B KLIPPER, R AF PHILLIPS, WT RUDOLPH, AS GOINS, B KLIPPER, R TI BIODISTRIBUTION STUDIES OF LIPOSOME ENCAPSULATED HEMOGLOBIN (LEH) STUDIED WITH A NEWLY DEVELOPED 99M-TECHNETIUM LIPOSOME LABEL SO BIOMATERIALS ARTIFICIAL CELLS AND IMMOBILIZATION BIOTECHNOLOGY LA English DT Article AB A new method has been developed to label preformed liposomes with 99m-Technetium (Tc-99m) using hexamethylpropylenamine oxime (HMPAO). Tc-99m is an ideal isotope for performing non-invasive dynamic biodistribution studies. This labeling method results in a high labeling efficiency (>95%) and is stable as determined by both in vitro and in vivo studies. In vitro studies indicated that glutathione encapsulated in the LEH is important in the labeling process with Tc-99m-HMPAO. In vivo studies with LEH were performed on 7 rabbits with dynamic scintigraphic 1 minute images performed from 1-120 minutes. Delayed images were performed at 20 hours followed by sacrifice and organ counting. Dynamic images reveal a gradual deposition of the LEH in the liver and spleen. Twenty hour biodistributions revealed 50% of the LEH remaining in the blood, 15% in the liver, 14% in the spleen, 3% in lungs, 3% in muscle with trace amounts in the brain, kidneys, and heart. Doses per gram were highest in the spleen with 12.5% of the injected dose per gram of spleen vs. 0.2% per gram of liver. This labeling technique is an effective method for non-invasively monitoring dynamic changes in liposome biodistribution and can be used to study the effects of various liposome modifications on biodistribution. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP PHILLIPS, WT (reprint author), UNIV TEXAS,HLTH SCI CTR,DEPT RADIOL,SAN ANTONIO,TX 78284, USA. RI Goins, Beth/F-1311-2010; Phillips, William/E-8427-2010 OI Phillips, William/0000-0001-8248-7817 NR 3 TC 11 Z9 11 U1 0 U2 1 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 1055-7172 J9 BIOMAT ARTIF CELL IM JI Biomater. Artif. Cells Immobil. Biotechnol. PY 1992 VL 20 IS 2-4 BP 757 EP 760 PG 4 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA JM745 UT WOS:A1992JM74500082 PM 1391508 ER PT S AU LIGLER, FS KUSTERBECK, AW OGERT, RA WEMHOFF, GA AF LIGLER, FS KUSTERBECK, AW OGERT, RA WEMHOFF, GA BE Mathewson, PR Finley, JW TI DRUG DETECTION USING THE FLOW IMMUNOSENSOR SO BIOSENSOR DESIGN AND APPLICATION SE ACS SYMPOSIUM SERIES LA English DT Review CT SYMP ON BIOSENSOR DESIGN AND APPLICATION, AT THE 201ST NATIONAL MEETING OF THE AMERICAN CHEMICAL SOC CY APR 14-19, 1991 CL ATLANTA, GA SP AMER CHEM SOC, DIV AGR & FOOD CHEM, AMER CHEM SOC, DIV AGROCHEM BIOCHEM TECHNOL, AMER CHEM SOC, DIV SMALL CHEM BUSINESS RP LIGLER, FS (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,SER 60901-255,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 0 TC 5 Z9 5 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA WASHINGTON SN 0097-6156 BN 0-8412-2494-3 J9 ACS SYM SER PY 1992 VL 511 BP 73 EP 80 PG 8 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Food Science & Technology; Toxicology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Food Science & Technology; Toxicology GA BX24H UT WOS:A1992BX24H00007 ER PT J AU STENGER, DA FARE, TL CRIBBS, DH RUSIN, KM AF STENGER, DA FARE, TL CRIBBS, DH RUSIN, KM TI VOLTAGE MODULATION OF A GATED ION CHANNEL ADMITTANCE IN PLATINUM-SUPPORTED LIPID BILAYERS SO BIOSENSORS & BIOELECTRONICS LA English DT Article DE BIOSENSOR; ION CHANNEL; AC (OR IMPEDANCE) MEASUREMENT; LIPID BILAYER ID PURIFIED ACETYLCHOLINE-RECEPTORS; AIR-WATER-INTERFACE; MEMBRANES; SURFACES; VDAC AB Platinum-supported phospholipid bilayers containing voltage-dependent anion channels (VDAC) were used to model physically a chemically sensitive amperometric biosensor which would use gated transmembrane channel proteins. An a.c. electrical technique was used to measure admittance changes caused by channel gating. The magnitude of the responses differed from those observed in bilayer lipid membranes (BLM). However, the bilayers were mechanically stable, and permitted reproducible gating of the VDAC conductance in response to d.c. bias voltages in the range of 0 to -60 mV. The technique may be generally suitable for fabrication of durable biosensors using chemically sensitive protein channels. C1 ST MARYS COLL,ST MARYS CITY,MD 20686. GEOCENTERS INC,FT WASHINGTON,MD 20744. RP STENGER, DA (reprint author), USN,RES LAB,CTR BIO MOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 18 TC 16 Z9 16 U1 0 U2 1 PU ELSEVIER ADVANCED TECHNOLOGY PI OXFORD PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0956-5663 J9 BIOSENS BIOELECTRON JI Biosens. Bioelectron. PY 1992 VL 7 IS 1 BP 11 EP 20 DI 10.1016/0956-5663(92)90026-J PG 10 WC Biophysics; Biotechnology & Applied Microbiology; Chemistry, Analytical; Electrochemistry; Nanoscience & Nanotechnology SC Biophysics; Biotechnology & Applied Microbiology; Chemistry; Electrochemistry; Science & Technology - Other Topics GA HA623 UT WOS:A1992HA62300004 ER PT J AU RUSIN, KM FARE, TL STEMPLE, JZ AF RUSIN, KM FARE, TL STEMPLE, JZ TI IMMOBILIZATION OF FLAVOPROTEINS ON SILICON - EFFECT OF CROSS-LINKER CHAIN-LENGTH ON ENZYME-ACTIVITY SO BIOSENSORS & BIOELECTRONICS LA English DT Article DE CHOLINE OXIDASE; GLUCOSE OXIDASE; COVALENT IMMOBILIZATION; SILICON DIOXIDE; FLUORESCENCE ASSAY; HETEROBIFUNCTIONAL CROSS-LINKER ID CHOLINE-OXIDASE; ACETYLCHOLINE; ANTIBODIES; SURFACES AB The effect of cross-linker chain length on the activities of choline oxidase (ChO) and glucose oxidase (GOx) immobilized on oxidized silicon wafers has been investigated for the cross-linkers N-succinimidyl 4-maleimidobutyrate (GMBS) and N-succinimidyl 6-maleimidocaproate (EMCS). Enzyme activities were determined with an indirect fluorometric assay based on the production of hydrogen peroxide. Immobilization of ChO or GOx onto oxidized silicon with either cross-linker resulted in an 86-99% loss in enzymatic activity relative to the soluble form of the flavoprotein. However, the different cross-linkers had distinctly different effects on enzyme activity: EMCS-immobilized GOx was four times more active than GMBS-immobilized GOx; EMCS-immobilized ChO had a sevenfold higher activity than GMBS-immobilized ChO. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 29 TC 13 Z9 13 U1 1 U2 6 PU ELSEVIER ADVANCED TECHNOLOGY PI OXFORD PA OXFORD FULFILLMENT CENTRE THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0956-5663 J9 BIOSENS BIOELECTRON JI Biosens. Bioelectron. PY 1992 VL 7 IS 5 BP 367 EP 373 DI 10.1016/0956-5663(92)85033-7 PG 7 WC Biophysics; Biotechnology & Applied Microbiology; Chemistry, Analytical; Electrochemistry; Nanoscience & Nanotechnology SC Biophysics; Biotechnology & Applied Microbiology; Chemistry; Electrochemistry; Science & Technology - Other Topics GA HW247 UT WOS:A1992HW24700009 PM 1632951 ER PT J AU SZU, H TATE, A CULLIN, D WALCH, M DEMSKE, D GARCIA, J PHUVAN, S CAVIRIS, N AF SZU, H TATE, A CULLIN, D WALCH, M DEMSKE, D GARCIA, J PHUVAN, S CAVIRIS, N TI MOLECULAR COMPUTING FOR EDGE-ENHANCED LASER IMAGING SO BIOSYSTEMS LA English DT Article; Proceedings Paper CT WORKSHOP AND INITIAL MEETING OF THE INTERNATIONAL SOC FOR MOLECULAR ELECTRONICS AND BIOCOMPUTING CY MAY 26-29, 1992 CL BALATONSZEPLAK, HUNGARY SP INT SOC MOLEC ELECTR & BIOCOMP DE MOLECULAR COMPUTING; LYAPUNOV CONVERGENCE; NONUNIFORM SAMPLING; BACTERIORHODOPSIN; SPATIAL LIGHT MODULATOR AB In order to illustrate the self-assembly capability, we consider a laser imaging experiment on a wet film that is made of bacteriorhodopsin (BR) molecules suspended in a diffusion-limited viscous medium. BR wet film is similar to a wet photograph film but having a finer resolution and adaptive pixel locations due to laser-induced thermal diffusion. The synergism between thermal diffusion of BR molecules (induced externally by a write-laser) and molecular photochromism (generated internally by a read-laser) is exploited naturally for edge-enhanced image applications. C1 USN,CTR SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20903. RP SZU, H (reprint author), USN,CTR SURFACE WARFARE,N35,DAHLGREN,VA 22448, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0303-2647 J9 BIOSYSTEMS JI Biosystems PY 1992 VL 27 IS 4 BP 179 EP 188 DI 10.1016/0303-2647(92)90053-2 PG 10 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA KH406 UT WOS:A1992KH40600002 PM 1493203 ER PT J AU HOROWITZ, B RYWKIN, S MARGOLISNUNNO, H WILLIAMS, B GEACINTOV, N PRINCE, AM PASCUAL, D RAGNO, G VALERI, CR HUIMABYRON, T AF HOROWITZ, B RYWKIN, S MARGOLISNUNNO, H WILLIAMS, B GEACINTOV, N PRINCE, AM PASCUAL, D RAGNO, G VALERI, CR HUIMABYRON, T TI INACTIVATION OF VIRUSES IN RED-CELL AND PLATELET CONCENTRATES WITH ALUMINUM PHTHALOCYANINE (ALPC) SULFONATES SO BLOOD CELLS LA English DT Article DE PHTHALOCYANINE; HIV; AIDS; VIRUS INACTIVATION; RED BLOOD CELLS; PLATELETS; BABOONS ID VIRAL INACTIVATION; BLOOD AB Aluminum phthalocyanine tetrasulfonates (AIPcS) are photoactive compounds with absorption maxima at 665-675 nm. The inactivation of viruses (vesicular stomatitis virus, VSV; human immunodeficiency virus, HIV) added to either whole blood or red blood cell concentrates (RBCC) and platelet concentrates (PC) on treatment with tetrasulfonated AIPc (AIPcS4) was evaluated. Treatment of RBCC with 10-mu-M AIPcS4 and 44 J/cm2 visible light resulted in the inactivation of greater-than-or-equal-to 10(5.5) infectious doses (TCID50) of cell-free VSV, greater-than-or-equal-to 10(5.6) TCID50 of cell-associated VSV, and greater-than-or-equal-to 10(4.7) TCID50 of cell-free sindbis virus. Both greater-than-or-equal-to 10(4.2) TCID50 of cell-free and greater-than-or-equal-to 10(3.6) TCID50 of cell-associated forms of HIV were also shown to be inactivated. Encephalomyocarditis virus, used as a model for nonenveloped viruses, was not inactivated. Equivalent virus kill with Photofrin II required a substantially higher concentration of dye and longer exposure to visible light. Following AIPcS4 treatment, red cell integrity was well maintained as judged by the low level (< 2%) of hemoglobin release immediately following treatment and on subsequent storage, by measurements of erythrocyte osmotic fragility, and by the normal recovery and circulatory survival on infusion of treated, autologous red blood cells in baboons. Treatment of PC with 10-mu-M AlPcS4 and 44 J/cm2 visible light also resulted in effective virus kill (greater-than-or-equal-to 10(5.5) TCID50) of VSV; however, both the rate and extent of platelet aggregation in response to collagen addition declined by at least 50%. Based on these results, further characterization of AlPcS4-treated RBCC is justified. C1 NYU,NEW YORK,NY 10003. BOSTON UNIV,SCH MED,USN,BLOOD RES LAB,BOSTON,MA 02118. RP HOROWITZ, B (reprint author), NEW YORK BLOOD CTR,310 E 67TH ST,NEW YORK,NY 10021, USA. FU NHLBI NIH HHS [HL41221] NR 16 TC 43 Z9 43 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-4684 J9 BLOOD CELLS JI Blood Cells PY 1992 VL 18 IS 1 BP 141 EP 150 PG 10 WC Hematology SC Hematology GA HD602 UT WOS:A1992HD60200011 PM 1617188 ER PT B AU HODGDON, JA AF HODGDON, JA BE Marriott, BM Grumstrupscott, J TI BODY-COMPOSITION IN THE MILITARY SERVICES - STANDARDS AND METHODS SO BODY COMPOSITION AND PHYSICAL PERFORMANCE: APPLICATIONS FOR THE MILITARY SERVICES LA English DT Proceedings Paper CT Workshop on Body Composition and Physical Performance: Applications for the Military Services CY FEB 06, 1990 CL WASHINGTON, DC SP NATL ACAD SCI, INST MED, FOOD & NUTR BOARD, COMM MILITARY NUTR RES C1 USN,HLTH RES CTR,SAN DIEGO,CA 92132. NR 0 TC 13 Z9 13 U1 0 U2 2 PU NATL ACADEMY PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, PO BOX 285, WASHINGTON, DC 20055 BN 0-309-04586-X PY 1992 BP 57 EP 70 PG 14 WC Nutrition & Dietetics; Physiology; Sport Sciences SC Nutrition & Dietetics; Physiology; Sport Sciences GA BZ40F UT WOS:A1992BZ40F00004 ER PT J AU BRAND, S AF BRAND, S TI APPLYING WEATHER ANALYSES AND FORECASTS IN THE NAVY DECISION-MAKING PROCESS SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article AB The meteorologist in the navy is rarely the decision maker. The meteorological information that is produced by model output or remotely sensed data has to be presented in a more tactically relevant form before being applied by military decision makers. Because of the increasing sensitivity to atmospheric parameters of new, sophisticated navy platforms, sensors, and weapon systems, knowledge of the environments in which they operate is also growing in importance. This article briefly discusses how the present-day meteorologist assists the navy decision makers. RP BRAND, S (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,ATMOSPHER DIRECTORATE,MONTEREY,CA 93940, 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 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD JAN PY 1992 VL 73 IS 1 BP 31 EP 33 DI 10.1175/1520-0477(1992)073<0031:AWAAFI>2.0.CO;2 PG 3 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HA688 UT WOS:A1992HA68800003 ER PT J AU JOHNSON, BE AF JOHNSON, BE TI BEST PAPERS ON LUNG-CANCER SO CANCER INVESTIGATION LA English DT Bibliography RP JOHNSON, BE (reprint author), USN HOSP,NCI,BETHESDA,MD 20814, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0735-7907 J9 CANCER INVEST JI Cancer Invest. PY 1992 VL 10 IS 5 BP 491 EP 492 DI 10.3109/07357909209024809 PG 2 WC Oncology SC Oncology GA JQ734 UT WOS:A1992JQ73400018 PM 1393696 ER PT B AU SEIDELMANN, PK AF SEIDELMANN, PK BE FERRAZMELLO, S TI SECULAR VARIATIONS IN OPTICAL OBSERVATIONS OF PLANETS - SUMMARY SO CHAOS, RESONANCE AND COLLECTIVE DYNAMICAL PHENOMENA IN THE SOLAR SYSTEM SE IAU SYMPOSIA LA English DT Proceedings Paper CT 152ND SYMP OF THE INTERNATIONAL ASTRONOMICAL UNION : CHAOS, RESONANCE AND COLLECTIVE DYNAMICAL PHENOMENA IN THE SOLAR SYSTEM CY JUL 15-19, 1991 CL ANGRA DOS REIS, BRAZIL SP INT ASTRON UNION, COMMISS CELESTIAL MECH, INT ASTRON UNION, COMMISS PHYS STUDY PLANET & SATELLITES, INT ASTRON UNION, COMMISS POSIT & MOT MINOR PLANETS COMETS & SATELLITES, NATL COUNCIL SCI DEV BRAZIL, STATE SAO PAULO, RES FDN, UNIV SAO PAULO, OBSERV NACL RP SEIDELMANN, PK (reprint author), USN OBSERV,WASHINGTON,DC 20390, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA DORDRECHT BN 0-7923-1782-3 J9 IAU SYMP PY 1992 VL 152 BP 49 EP 51 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BW26V UT WOS:A1992BW26V00008 ER PT B AU LEVISON, HF AF LEVISON, HF BE FERRAZMELLO, S TI THE LONG-TERM DYNAMIC BEHAVIOR OF SMALL BODIES IN THE KUIPER BELT SO CHAOS, RESONANCE AND COLLECTIVE DYNAMICAL PHENOMENA IN THE SOLAR SYSTEM SE IAU SYMPOSIA LA English DT Proceedings Paper CT 152ND SYMP OF THE INTERNATIONAL ASTRONOMICAL UNION : CHAOS, RESONANCE AND COLLECTIVE DYNAMICAL PHENOMENA IN THE SOLAR SYSTEM CY JUL 15-19, 1991 CL ANGRA DOS REIS, BRAZIL SP INT ASTRON UNION, COMMISS CELESTIAL MECH, INT ASTRON UNION, COMMISS PHYS STUDY PLANET & SATELLITES, INT ASTRON UNION, COMMISS POSIT & MOT MINOR PLANETS COMETS & SATELLITES, NATL COUNCIL SCI DEV BRAZIL, STATE SAO PAULO, RES FDN, UNIV SAO PAULO, OBSERV NACL RP LEVISON, HF (reprint author), USN OBSERV,DEPT ORBITAL MECH,WASHINGTON,DC 20392, USA. RI Levison, Harold/C-6061-2013 OI Levison, Harold/0000-0001-5847-8099 NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA DORDRECHT BN 0-7923-1782-3 J9 IAU SYMP PY 1992 VL 152 BP 275 EP 279 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BW26V UT WOS:A1992BW26V00041 ER PT J AU HONG, SS ROMSTEDT, KJ FELLER, DR HSU, FL GEORGE, C CUPPS, TL LYON, RA MILLER, DD AF HONG, SS ROMSTEDT, KJ FELLER, DR HSU, FL GEORGE, C CUPPS, TL LYON, RA MILLER, DD TI RESOLUTION AND ADRENERGIC ACTIVITIES OF THE OPTICAL ISOMERS OF 4-[1-(1-NAPHTHYL)ETHYL]-1H-IMIDAZOLE SO CHIRALITY LA English DT Article DE ALPHA-ADRENERGIC; IMIDAYOLE ANALOGS; METETOMIDINE; ENANTIOMERS ID SELECTIVE ALPHA-2-ADRENOCEPTOR AGONIST; HEALTHY-VOLUNTEERS; MEDETOMIDINE; DEXMEDETOMIDINE AB Recently we synthesized a naphthalene analog of medetomidine, 4-[1-(1-naphthyl)ethyl]-1H-imidazole hydrochloride (1), and found it to be highly potent in adrenergic systems. The separation of optical isomers of this naphthalene analog was achieved by using the isomers of tartaric acid. The optical purities of the isomers were determined by HPLC using a chiral column. Using X-ray analysis the (+)-isomer was determined to have the S absolute configuration. It has been reported that the (+)-isomer of medetomidine (2) is the most potent enantiomer on alpha2-adrenergic receptors. There were both qualitative and quantitative differences in biological activities of the optical isomers of 1 in alpha1- and alpha2-adrenergic receptor systems of guinea pig ileum and human platelets. (+)-(S)-1, but not (-)-(R)-1 was a selective agonist of alpha2-mediated responses in ileum whereas (-)-(R)-1 was more potent than (+)-(S)-1 as an inhibitor of alpha2-mediated platelet aggregation. C1 OHIO STATE UNIV,COLL PHARM,DIV PHARMACOL,COLUMBUS,OH 43210. USA,CHEM RES,ABERDEEN PROVING GROUND,MD 21010. USN,RES LAB,WASHINGTON,DC 20375. PROCTER & GAMBLE CO,CINCINNATI,OH 45239. RP HONG, SS (reprint author), OHIO STATE UNIV,COLL PHARM,DIV MED CHEM & PHARMACOGNOSY,COLUMBUS,OH 43210, USA. NR 17 TC 7 Z9 7 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0899-0042 J9 CHIRALITY JI Chirality PY 1992 VL 4 IS 7 BP 432 EP 438 DI 10.1002/chir.530040706 PG 7 WC Chemistry, Medicinal; Chemistry, Analytical; Chemistry, Organic; Pharmacology & Pharmacy SC Pharmacology & Pharmacy; Chemistry GA JW318 UT WOS:A1992JW31800005 PM 1361151 ER PT J AU CROWLEY, JP METZGER, J PIVACEK, L VALERI, CR AF CROWLEY, JP METZGER, J PIVACEK, L VALERI, CR TI THE EFFECT OF VIABLE AND NONVIABLE AUTOLOGOUS RED-BLOOD-CELL TRANSFUSIONS ON EXPERIMENTAL BACTEREMIA SO CIRCULATORY SHOCK LA English DT Article DE TRANSFUSION; IMMUNODEFICIENCY; BACTEREMIA; SHOCK; THROMBOSIS ID INFECTION; SUSCEPTIBILITY; SEPSIS; IRON AB Nonviable red blood cells are rapidly cleared from the peripheral blood by the reticuloendothelial system. Since bacteria present in the blood stream are also cleared by the reticuloendothelial system, the possibility that nonviable red blood cells would interfere with the clearance of bacteria has been raised. Groups of dogs were studied in whom an experimental bacteremia was produced by the injection of E. coli (1 x 10(10)/kg). Bacterial clearance, endotoxin clearance, changes in mean arterial pressure, changes in oncotic pressure, and coagulation responses were monitored before and following autologous transfusion of approximately 10 cc/kg of packed red blood cells (PRBC) preserved with acid citrate dextrose or heparinized PRBC stored without preservative. In the latter blood product the majority of the red blood cells were nonviable. Clearance of E coli over a 4-hr period was similar in the two transfused groups and in a control group without blood transfusion. Mean arterial pressure and blood pH fell significantly in all groups, but was again not significantly different among the groups studied. Endotoxin clearance, changes in oncotic pressure, blood oncotic proteins, and parameters of the blood coagulation system were also similar in all three groups. The results of this study indicate that in normal dogs made acutely bacteremic with E. coli, there were no significant differences over a 4-hr period in their hemodynamic or hematologic responses following transfusion of viable or nonviable autologous red blood cells. C1 BROWN UNIV,DEPT MED,PROVIDENCE,RI 02912. USN,BLOOD RES LAB,BOSTON,MA. BOSTON UNIV,SCH MED,BOSTON,MA 02118. RP CROWLEY, JP (reprint author), RHODE ISL HOSP,DIV CLIN HEMATOL,593 EDDY ST,PROVIDENCE,RI 02903, USA. FU NHLBI NIH HHS [KO7HLO125901A1] NR 18 TC 2 Z9 2 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 0092-6213 J9 CIRC SHOCK JI Circ. Shock PD JAN PY 1992 VL 36 IS 1 BP 31 EP 37 PG 7 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA GY275 UT WOS:A1992GY27500004 PM 1551184 ER PT J AU FLETCHER, MA MCKENNA, TM OWENS, EH NADKARNI, VM AF FLETCHER, MA MCKENNA, TM OWENS, EH NADKARNI, VM TI EFFECTS OF INVIVO PENTOXIFYLLINE TREATMENT ON SURVIVAL AND EXVIVO VASCULAR CONTRACTILITY IN A RAT LIPOPOLYSACCHARIDE SHOCK MODEL SO CIRCULATORY SHOCK LA English DT Article DE DOSE; DOSING; METHYLXANTHINE; AORTA; NOREPINEPHRINE; HALOTHANE; VASODILATION ID SEPTIC SHOCK; ORAL PENTOXIFYLLINE; HEALTHY-VOLUNTEERS; SMOOTH-MUSCLE; ENDOTOXIN; TISSUE; PHARMACOKINETICS; AMINOPHYLLINE; VASOPRESSIN; RESISTANCE AB Depending on the dose and dosing, pentoxifylline (PTX) treatment can improve or worsen survival from lipopolysaccharide (LPS) shock in rats. Intraperitoneal (i.p.) PTX, 20 mg/kg, administered once 15 min after intravenous (i.v.) LPS (17 mg/kg), significantly improved survival in unanesthetized LPS-shocked rats. Multiple 20 mg/kg PTX injections (five total, spaced at 45 min intervals starting 15 min after LPS) significantly worsened survival. A lower dose, 12 mg/kg, given as a single or multiple injections, did not alter survival. We tested the ex vivo contractile response to norepinephrine (NE) of aortic rings isolated 3.75 hr after i.v. injection of PBS or LPS. Both untreated LPS-shocked and multiple 12 mg/kg PTX treated normal rats (i.v. PBS) had significantly diminished maximum contractility. The ex vivo vascular hypocontractility found in untreated LPS-shocked rats was not aggravated nor ameliorated by multiple 12 mg/kg PTX injections. The ex vivo effects on contractility of multiple 20 mg/kg PTX treatment of LPS shock could not be studied because survival times were shorter than 3.5 hr. In using PTX to treat LPS shock, potentially harmful vasodilation must be considered. C1 MED CTR DELAWARE,WILMINGTON,DE. RP FLETCHER, MA (reprint author), USN,MED RES INST,SEPT SHOCK RES PROGRAM,BETHESDA,MD 20889, USA. NR 38 TC 24 Z9 24 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0092-6213 J9 CIRC SHOCK JI Circ. Shock PD JAN PY 1992 VL 36 IS 1 BP 74 EP 80 PG 7 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA GY275 UT WOS:A1992GY27500010 PM 1551188 ER PT J AU BURTON, KA LADOUCEUR, HD FLEMING, JW AF BURTON, KA LADOUCEUR, HD FLEMING, JW TI AN IMPROVED NONCATALYTIC COATING FOR THERMOCOUPLES SO COMBUSTION SCIENCE AND TECHNOLOGY LA English DT Note DE THERMOCOUPLE COATING; TEMPERATURE MEASUREMENT; LOW PRESSURE FLAME C1 USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375. NR 11 TC 27 Z9 28 U1 0 U2 2 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0010-2202 J9 COMBUST SCI TECHNOL JI Combust. Sci. Technol. PY 1992 VL 81 IS 1-3 BP 141 EP 145 DI 10.1080/00102209208951798 PG 5 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Energy & Fuels; Engineering GA HM179 UT WOS:A1992HM17900008 ER PT J AU SCHADOW, KC GUTMARK, E WILSON, KJ AF SCHADOW, KC GUTMARK, E WILSON, KJ TI ACTIVE COMBUSTION CONTROL IN A COAXIAL DUMP COMBUSTOR SO COMBUSTION SCIENCE AND TECHNOLOGY LA English DT Article DE COMBUSTION CONTROL; DUMP COMBUSTOR ID INSTABILITIES; EXCITATION RP SCHADOW, KC (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. NR 18 TC 30 Z9 30 U1 1 U2 7 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0010-2202 J9 COMBUST SCI TECHNOL JI Combust. Sci. Technol. PY 1992 VL 81 IS 4-6 BP 285 EP 300 DI 10.1080/00102209208951807 PG 16 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Energy & Fuels; Engineering GA HN198 UT WOS:A1992HN19800009 ER PT J AU JAMES, BR ASCHMANN, SG AF JAMES, BR ASCHMANN, SG TI SOLUBLE PHOSPHORUS IN A FOREST SOIL AP HORIZON AMENDED WITH MUNICIPAL WASTE-WATER SLUDGE OR COMPOST SO COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS LA English DT Article AB Soluble P in forest soils amended with municipal wastewater sludges may exist as orthophosphate or organic P, and microbial or chemical reactions controlling the distribution between the two forms will affect its availability to plants and concentration in soil solution at the C-rich, forest floor-mineral horizon boundary. A laboratory leaching study identified time-dependent changes in soluble orthophosphate and organic P (operationally-defined as labile and nonlabile soluble P; LSP and NLSP, respectively) in samples of Chester soil A horizon (fine-loamy, mixed, mesic, Typic Hapludult) amended with municipal wastewater sludge or sludge compost. The soil was sampled from a hardwood forest typical of the Piedmont physiographic region of Maryland. The sludge materials were added to the soil with or without leaf litter that was also sampled from the site. Concentrations of total soluble P (TSP) in leachates decreased over 51 d of the incubation, and the percentage of TSP as LSP increased to nearly 100%, while NLSP was preferentially adsorbed by the soil or immobilized by microbial uptake. The only increases measured during the incubation were in LSP in the compost treatments, and LSP and NLSP decreased with time in all other treatments. Leaf litter additions decreased quantities of P released or enhanced P removal in all treatments over time. The results suggested that compost may be a better source of plant-available P than municipal wastewater sludge, even though compost principally contains insoluble, organic P and sludge contains higher levels of soluble orthophosphate. C1 USN,FACIL ENGN COMMAND,PACIFIC DIV,HONOLULU,HI 96860. RP JAMES, BR (reprint author), UNIV MARYLAND,DEPT AGRON,COLLEGE PK,MD 20742, USA. NR 16 TC 9 Z9 9 U1 0 U2 1 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0010-3624 J9 COMMUN SOIL SCI PLAN JI Commun. Soil Sci. Plant Anal. PY 1992 VL 23 IS 7-8 BP 861 EP 875 DI 10.1080/00103629209368635 PG 15 WC Agronomy; Plant Sciences; Chemistry, Analytical; Soil Science SC Agriculture; Plant Sciences; Chemistry GA HT114 UT WOS:A1992HT11400020 ER PT J AU ARAS, G WHITAKER, LR AF ARAS, G WHITAKER, LR TI A SEQUENTIAL SCHEME TO ESTIMATE THE OPTIMAL AGE REPLACEMENT POLICY SO COMMUNICATIONS IN STATISTICS-THEORY AND METHODS LA English DT Article DE AGE REPLACEMENT POLICIES; HAZARD RATE; NELSON-AALEN ESTIMATOR AB Consider a system which is subject to failure and must be replaced when this occurs. If it costs less to replace the system in advance before failure, it may be advantageous to use an age replacement policy. However, the optimal age to replace the system is unknown if the underlying failure distribution is unknown. This paper develops a scheme to update the current estimate of the optimal age replacement policy in an on-line fashion and simultaneously controlling costs by reducing system failures. C1 UNIV CALIF SANTA BARBARA, DEPT STAT & APPL PROBABIL, SANTA BARBARA, CA 93106 USA. NAVAL POST GRAD SCH, DEPT OPERAT RES, MONTEREY, CA 93943 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS INC PI PHILADELPHIA PA 530 WALNUT STREET, STE 850, PHILADELPHIA, PA 19106 USA SN 0361-0926 EI 1532-415X J9 COMMUN STAT-THEOR M JI Commun. Stat.-Theory Methods PY 1992 VL 21 IS 8 BP 2325 EP 2338 DI 10.1080/03610929208830915 PG 14 WC Statistics & Probability SC Mathematics GA JF876 UT WOS:A1992JF87600015 ER PT J AU HARMON, CC AF HARMON, CC TI ILLUSTRATIONS OF LEARNING IN COUNTERINSURGENCY SO COMPARATIVE STRATEGY LA English DT Article AB Makers of strategy are not only responsible for prewar assessments, but must be responsive during war and capable of reassessing their enemy and their approach to the enemy. The record of French, British, and American counterinsurgency campaigns shows that this learning process can be aided by attention to lessons of past "small wars" and even to general principles of insurgency. Such distilled wisdom is difficult to apply to new situations, but the price for inattention to experience may be failure. RP HARMON, CC (reprint author), USN,COLL WAR,DEPT STRATEGY,NEWPORT,RI 02840, USA. NR 26 TC 4 Z9 4 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0149-5933 J9 COMP STRATEGY PD JAN-MAR PY 1992 VL 11 IS 1 BP 29 EP 48 DI 10.1080/01495939208402861 PG 20 WC International Relations; Political Science SC International Relations; Government & Law GA GW565 UT WOS:A1992GW56500003 ER PT J AU RAOUF, RA PALAZOTTO, AN AF RAOUF, RA PALAZOTTO, AN TI NONLINEAR FREE-VIBRATIONS OF SYMMETRICALLY LAMINATED, SLIGHTLY COMPRESSIBLE CYLINDRICAL-SHELL PANELS SO COMPOSITE STRUCTURES LA English DT Article AB A geometrically non-linear dynamic shell theory presented by the authors in an earlier work is used to study the non-linear free vibrations of symmetrically laminated cylindrical shell panels. The theory accounts for arbitrary lamination constructions, anisotropy, and slight compression across the thickness. In this paper, this theory is used to derive the equation of motion of the panel with quadratic and cubic non-linearities and symmetric lamination schemes. The symbolic manipulator Mathematica(TM) is used to perform the Rayleigh-Ritz procedure and derive a single-mode approximation to the vibration of the panel. The Lindstedt-Poincare perturbation technique is used to analyze the resulting non-linear differential equation of motion and study the effects of non-linearities on the dynamics of free vibrations of the panel. A numerical example of a symmetrically laminated graphite/epoxy shell panel is used to demonstrate the procedure. The numerical example shows that non-linearities are of the hardening type and are more pronounced for smaller opening angles. Moreover, it shows that the larger-amplitude motions are dominated by the lower modes. C1 USAF,INST TECHNOL,DEPT AERONAUT & ASTRONAUT,WRIGHT PATTERSON AFB,OH 45433. RP RAOUF, RA (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 4 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0263-8223 J9 COMPOS STRUCT JI Compos. Struct. PY 1992 VL 20 IS 4 BP 249 EP 257 DI 10.1016/0263-8223(92)90030-G PG 9 WC Materials Science, Composites SC Materials Science GA HP142 UT WOS:A1992HP14200005 ER PT J AU SOTTOS, NR MCCULLOUGH, RL SCOTT, WR AF SOTTOS, NR MCCULLOUGH, RL SCOTT, WR TI THE INFLUENCE OF INTERPHASE REGIONS ON LOCAL THERMAL DISPLACEMENTS IN COMPOSITES SO COMPOSITES SCIENCE AND TECHNOLOGY LA English DT Article DE INTERPHASE; THERMAL; DISPLACEMENTS; FIBER MATRIX INTERFACE; LOCAL PROPERTIES ID FIBER REINFORCED THERMOPLASTICS; BOUNDARY INTERPHASE; STRESSES; CARBON; EPOXY AB Although the exact physical and chemical mechanisms are not clearly understood, it is widely believed that an interphase region with properties that differ from those of the plain matrix is developed near fiber surfaces in polymer matrix composites. The current study involves experimental investigation and theoretical modeling of the influence of the interphase on local thermal displacements. Experimental studies have centered on the development of a scanning microinterferometer for in-situ measurements of thermal displacements in the interphase. Thermal displacement measurements have been successfully made for specimens containing a single carbon fiber embedded in an epoxy matrix. A three-phase composite cylinder model is adopted to predict the thermal displacements of the single fiber specimen. Comparison of the theoretical displacement predictions with the experimental profiles measured by the interferometer indicate that the value of the matrix properties near the fiber surface differs from the value in the bulk resin. The data provide evidence of the existence of a lower glass transition temperature in the interphase. C1 UNIV DELAWARE,DEPT MECH ENGN,NEWARK,DE 19716. UNIV DELAWARE,CTR COMPOSITE MAT,NEWARK,DE 19716. USN,CTR AIR DEV,WARMINSTER,PA 18974. NR 39 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0266-3538 J9 COMPOS SCI TECHNOL JI Compos. Sci. Technol. PY 1992 VL 44 IS 4 BP 319 EP 332 DI 10.1016/0266-3538(92)90069-F PG 14 WC Materials Science, Composites SC Materials Science GA HX099 UT WOS:A1992HX09900004 ER PT J AU LARSON, HJ AF LARSON, HJ TI LEAST-SQUARES ESTIMATION OF LINEAR SPLINES WITH UNKNOWN KNOT LOCATIONS SO COMPUTATIONAL STATISTICS & DATA ANALYSIS LA English DT Article DE LEAST SQUARES ESTIMATION OF SPLINES; SPLINES WITH UNKNOWN KNOT LOCATIONS; BEST KNOT LOCATIONS FOR SPLINES ID REGRESSION AB Many papers have appeared in the literature over the past 30 years concerning the least squares estimation of spline functions. All of these previously published procedures rely on numerical search techniques when faced with splines which have knots at unknown locations. In the special case of linear splines with unknown knot locations, such numerical searches are unnecessary. as shown in this paper. If one specifies a desired (known) number of knots using linear splines, the least squares solution(s) for the minimizing location(s) can be explicitly located. Some data generated by a computer simulation of a war game is used to illustrate the procedure. C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. NR 6 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9473 J9 COMPUT STAT DATA AN JI Comput. Stat. Data Anal. PD JAN PY 1992 VL 13 IS 1 BP 1 EP 8 DI 10.1016/0167-9473(92)90149-A PG 8 WC Computer Science, Interdisciplinary Applications; Statistics & Probability SC Computer Science; Mathematics GA GW946 UT WOS:A1992GW94600001 ER PT J AU FEDERICO, PA AF FEDERICO, PA TI ASSESSING SEMANTIC KNOWLEDGE USING COMPUTER-BASED AND PAPER-BASED MEDIA SO COMPUTERS IN HUMAN BEHAVIOR LA English DT Article ID PERFORMANCE; ALCOHOL; TESTS AB Using a within-subjects design, 75 naval pilots and flight officers were administered computer-based and paper-based tests to assess semantic knowledge in order to determine the relative reliabilities and validities of these two measurement modes. Estimates of internal consistencies, equivalences, and discriminative validities were computed for multiple performance measures. It was revealed that the relative reliabilities derived for these two assessment schemes using multivariate measurement criteria were not significantly different, and the discriminant validity of computer-based measures was superior to paper-based measures. RP FEDERICO, PA (reprint author), USN,CTR PERSONNEL RES & DEV,CODE 13,SAN DIEGO,CA 92152, USA. NR 47 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 0747-5632 J9 COMPUT HUM BEHAV JI Comput. Hum. Behav. PY 1992 VL 8 IS 2-3 BP 169 EP 181 DI 10.1016/0747-5632(92)90002-V PG 13 WC Psychology, Multidisciplinary; Psychology, Experimental SC Psychology GA HV921 UT WOS:A1992HV92100002 ER PT J AU LOZIER, DW TURNER, PR AF LOZIER, DW TURNER, PR TI ROBUST PARALLEL COMPUTATION IN FLOATING-POINT AND SLI ARITHMETIC SO COMPUTING LA English DT Article DE PARALLEL COMPUTATION; VECTOR NORMS; SYMMETRICAL LEVEL-INDEX ARITHMETIC; FLOATING-POINT ARITHMETIC; ERROR ANALYSIS; VECTORIZED ALGORITHMS ID INDEX AB In this paper we consider the parallel computation of vector norms and inner products in floating-point and a proposed new form of computer arithmetic, the symmetric level-index system. The vector norms provide an illuminating example of the contrast between the two arithmetic systems under discussion in terms of the ability-to program for (complete) robustness and parallelizability. The conflict between robustness of the computation-in the sense of the dual requirements of accuracy and freedom from overflow and underflow-and easy parallelization of the algorithms within a floating-point environment is made plain. It is seen that this conflict disappears if the symmetric level-index system of arithmetic is used. The freedom from overflow and underflow offered by this system allows the programming of the straightforward definitions in a way which is simple, robust and immediately parallelizable. Numerical results are given to illustrate the fact that the symmetric level-index system yields results of comparable accuracy to those of floating-point in cases where the latter-system works and still yields results of high accuracy when the floating-point system fails altogether. C1 USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. RP LOZIER, DW (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 25 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER-VERLAG WIEN PI VIENNA PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 VIENNA, AUSTRIA SN 0010-485X J9 COMPUTING JI Computing PY 1992 VL 48 IS 3-4 BP 239 EP 257 DI 10.1007/BF02238636 PG 19 WC Computer Science, Theory & Methods SC Computer Science GA JJ833 UT WOS:A1992JJ83300002 ER PT B AU PIERCE, JT AF PIERCE, JT BE Clewell, HJ TI CHEMICAL RISK ASSESSMENT - THE NAVY OCCUPATIONAL APPROACH SO CONFERENCE ON CHEMICAL RISK ASSESSMENT IN THE DEPARTMENT OF DEFENSE (DOD): SCIENCE, POLICY, AND PRACTICE LA English DT Proceedings Paper CT Conference on Chemical Risk Assessment in the Department of Defense (DoD) - Science, Policy, and Practice CY APR 09-11, 1991 CL DAYTON, OH SP ARMSTRONG LAB, OCCUPAT & ENVIRONM HLTH DIRECTORATE, TOXICOL DIV, NAVAL MED RES INST, TOXICOL DETACHMENT, ARMY BIOMED RES & DEV LAB, NATL RES COUNCIL COMM TOXICOL C1 USN RESERVE,RAYMORE,MO 64083. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CONFERENCE GOVERNMENTAL INDUSTRIAL HYGIENISTS PI CINCINNATI PA 6500 GLENWAY AVE, BLDG D-7, CINCINNATI, OH 45211 BN 0-936712-90-2 PY 1992 BP 3 EP 7 PG 5 WC Public, Environmental & Occupational Health; Toxicology SC Public, Environmental & Occupational Health; Toxicology GA BC41F UT WOS:A1992BC41F00001 ER PT B AU RIEGEL, KW AF RIEGEL, KW BE Clewell, HJ TI PCBS ON NAVAL VESSELS SO CONFERENCE ON CHEMICAL RISK ASSESSMENT IN THE DEPARTMENT OF DEFENSE (DOD): SCIENCE, POLICY, AND PRACTICE LA English DT Meeting Abstract CT Conference on Chemical Risk Assessment in the Department of Defense (DoD) - Science, Policy, and Practice CY APR 09-11, 1991 CL DAYTON, OH SP ARMSTRONG LAB, OCCUPAT & ENVIRONM HLTH DIRECTORATE, TOXICOL DIV, NAVAL MED RES INST, TOXICOL DETACHMENT, ARMY BIOMED RES & DEV LAB, NATL RES COUNCIL COMM TOXICOL C1 USN,NAVAL SEA SYSTEMS COMMAND,ENVIRONM PROTECT OFF,WASHINGTON,DC 20362. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CONFERENCE GOVERNMENTAL INDUSTRIAL HYGIENISTS PI CINCINNATI PA 6500 GLENWAY AVE, BLDG D-7, CINCINNATI, OH 45211 BN 0-936712-90-2 PY 1992 BP 87 EP 87 PG 1 WC Public, Environmental & Occupational Health; Toxicology SC Public, Environmental & Occupational Health; Toxicology GA BC41F UT WOS:A1992BC41F00015 ER PT J AU DIXON, DS AF DIXON, DS TI THE EFFECT OF CORROSION ON THE SHIPBOARD PERFORMANCE OF EMI/EMP GROUND ADAPTERS - ORIGINAL AND IMPROVED DESIGN CONCEPTS SO CORROSION LA English DT Article DE ANTENNA PERFORMANCE; ELECTROMAGNETIC INTERFERENCE; ELECTROMAGNETIC PULSE; ENVIRONMENT GROUND ADAPTERS; SHIELD GROUND ADAPTERS AB Utilizing existing shipboard waterproof transition fittings (kickpipes) and existing ground adapters to protect cables routed between topside and below-deck or intercompartmental spaces have created performance degradation of over 120 dB. These electromagnetic interference and electromagnetic pulse (EMI/EMP) protection devices are called ground adapters since they attempt to protect below-deck systems from various high-level electromagnetic (EM) threatS by Shunting high-level currents into the ground plane. Specifically, these shield and conduit ground adapters (SGAs/CGAs) are devices designed to establish a 360-degree, low-impedance, wide-band, long-term electrical connection between either a cable's shield or a shield conduit and the ground structure through which the cable or conduit passes. This low-impedance connection is designed to reduce and/or eliminate EMI and/or EMP Problems by shunting undesired high-level electromagnetic (EM) currents into the system's ground plane before reaching below deck spaces. Several years ago, two SGAs were installed on the deck of a U.S. Naval ship for evaluation. AC and DC performance measurements were conducted on the SGAs prior to the installation, five months after installation, and then one year later after being exposed to 12 months of harsh marine environment. This paper will discuss: (1) the shipboard measured DC values of ground adapter degradation, (2) the laboratory-measured DC and AC values of ground adapter degradation, (3) the corrosion-related factors causing this degradation, (4) near- and long-term solutions to eliminate this degradation, and (5) the need for corrosion analysis and EM modeling in the development process. RP DIXON, DS (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD JAN PY 1992 VL 48 IS 1 BP 68 EP 78 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HV958 UT WOS:A1992HV95800010 ER PT J AU CHRISTEN, DK DYNES, RC EMERY, VJ FALCO, CM GUBSER, DU JIN, S KROGER, H SHAW, DT AF CHRISTEN, DK DYNES, RC EMERY, VJ FALCO, CM GUBSER, DU JIN, S KROGER, H SHAW, DT TI NEW RESEARCH OPPORTUNITIES IN SUPERCONDUCTIVITY .3. COPPER MOUNTAIN, COLORADO, USA, 19-20 AUGUST 1991 SO CRYOGENICS LA English DT Article C1 UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92103. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV ARIZONA,TUCSON,AZ 85721. OFF NAVAL RES,ARLINGTON,VA 22217. AT&T BELL LABS,MURRAY HILL,NJ 07974. SUNY BUFFALO,BUFFALO,NY 14260. RP CHRISTEN, DK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. NR 0 TC 3 Z9 3 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PY 1992 VL 32 IS 4 BP 338 EP 352 DI 10.1016/0011-2275(92)90052-C PG 15 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA HJ741 UT WOS:A1992HJ74100001 ER PT J AU KING, SE VANVECHTEN, D AF KING, SE VANVECHTEN, D TI 4TH INTERNATIONAL WORKSHOP ON LOW-TEMPERATURE DETECTORS - OXFORD, UK, 4-7 SEPTEMBER 1991 SO CRYOGENICS LA English DT Editorial Material RP KING, SE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PY 1992 VL 32 IS 7 BP 685 EP 686 DI 10.1016/0011-2275(92)90306-U PG 2 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA JB723 UT WOS:A1992JB72300016 ER PT J AU LIEBENBERG, DH MCINTYRE, PC CIMA, MJ FRANCAVILLA, TL AF LIEBENBERG, DH MCINTYRE, PC CIMA, MJ FRANCAVILLA, TL TI ANGULAR-DEPENDENCE OF CRITICAL CURRENTS OF HIGH-TEMPERATURE SUPERCONDUCTING FILMS IN HIGH MAGNETIC-FIELDS PREPARED BY METALORGANIC DEPOSITION SO CRYOGENICS LA English DT Article; Proceedings Paper CT CONF ON CRITICAL CURRENTS IN HIGH T(C) SUPERCONDUCTORS CY APR 22-24, 1992 CL VIENNA, AUSTRIA DE CRITICAL CURRENTS; ANGULAR DEPENDENCE; MAGNETIC FIELDS ID CRITICAL CURRENT-DENSITY; MIXED-STATE; FLUX; YBA2CU3O7; TRANSPORT AB Critical current measurements have been obtained as a function of angle of the magnetic field to the plane of the thin film metalorganic deposited YBa2Cu3O7-x (YBCO). In the present measurements the current flowed in the a,b plane and was always perpendicular to the applied field. In contrast to the usual observations that show a maximum critical current for H parallel-to a,b and a minimum with H parallel-to c these new measurements of films with a high critical current density show a secondary maximum with this latter field orientation. Adaptation of a model for angular torque dependence gives a qualitative understanding of the results. C1 MIT,CERAM PROC RES LAB,CAMBRIDGE,MA 02139. USN,RES LAB,WASHINGTON,DC 20375. RP LIEBENBERG, DH (reprint author), USN,OFF RES,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 13 TC 5 Z9 5 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PY 1992 VL 32 IS 11 BP 1066 EP 1070 DI 10.1016/0011-2275(92)90029-A PG 5 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA JW017 UT WOS:A1992JW01700029 ER PT J AU NISENOFF, M AF NISENOFF, M TI 2ND SYMPOSIUM ON HIGH-TEMPERATURE SUPERCONDUCTORS IN HIGH-FREQUENCY FIELDS - SANTA-FE, NM, USA, 1-3 APRIL 1992 SO CRYOGENICS LA English DT Editorial Material RP NISENOFF, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PY 1992 VL 32 IS 12 BP 1169 EP 1170 DI 10.1016/0011-2275(92)90333-6 PG 2 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA KA230 UT WOS:A1992KA23000010 ER PT S AU MEADOWS, CL AF MEADOWS, CL BE Landwehr, CE Jajodia, S TI DISCUSSION SUMMARY - 5TH IFIP WG 11.3 WORKING CONFERENCE AND MEETING SO DATABASE SECURITY, V: STATUS AND PROSPECTS SE IFIP TRANSACTIONS A-COMPUTER SCIENCE AND TECHNOLOGY LA English DT Proceedings Paper CT IFIP WG11.3 5th Workshop on Database Security CY NOV 04-07, 1991 CL SHEPHERDSTOWN, WV SP IFIP C1 USN,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE PUBL B V PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-5473 BN 0-444-89518-3 J9 IFIP TRANS A PY 1992 VL 6 BP 387 EP 397 PG 11 WC Computer Science, Information Systems; Computer Science, Theory & Methods SC Computer Science GA BZ90L UT WOS:A1992BZ90L00020 ER PT S AU LANDWEHR, CE AF LANDWEHR, CE BE Landwehr, CE Jajodia, S TI IFIP WG11.3 DATABASE-SECURITY - RESEARCH QUESTIONS OF CURRENT SIGNIFICANCE REVISION OF FEBRUARY 1991 SO DATABASE SECURITY, V: STATUS AND PROSPECTS SE IFIP TRANSACTIONS A-COMPUTER SCIENCE AND TECHNOLOGY LA English DT Proceedings Paper CT IFIP WG11.3 5th Workshop on Database Security CY NOV 04-07, 1991 CL SHEPHERDSTOWN, WV SP IFIP C1 USN,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE PUBL B V PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0926-5473 BN 0-444-89518-3 J9 IFIP TRANS A PY 1992 VL 6 BP 399 EP 400 PG 2 WC Computer Science, Information Systems; Computer Science, Theory & Methods SC Computer Science GA BZ90L UT WOS:A1992BZ90L00021 ER PT J AU MELESE, F BLANDIN, J FANCHON, P AF MELESE, F BLANDIN, J FANCHON, P TI BENEFITS AND PAY - THE ECONOMICS OF MILITARY COMPENSATION SO DEFENCE ECONOMICS LA English DT Article DE EMPLOYEE COMPENSATION; IN-KIND BENEFITS; BONUSES; PRICE SUBSIDIES; RECRUITMENT; RETENTION AB This paper develops a simple analytical framework which captures the economic impact of benefits on both employer and employee decision-making. It is within this framework that the role of benefits in the military compensation equation is explored. It is demonstrated that employer and employee decisions concerning an appropriate wage-benefit mix can have significant and predictable impacts on hiring, retention, labor costs and the characteristics of individuals that make up the armed forces. C1 CALIF POLYTECH STATE UNIV SAN LUIS OBISPO,DEPT ACOUST,SAN LUIS OBISPO,CA 93407. RP MELESE, F (reprint author), USN,POSTGRAD SCH,DRMI,MONTEREY,CA 93943, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU HARWOOD ACAD PUBL GMBH PI READING PA C/O STBS LTD, PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 1043-0717 J9 DEFENC ECON PY 1992 VL 3 IS 3 BP 243 EP 253 DI 10.1080/10430719208404732 PG 11 WC Economics SC Business & Economics GA MC522 UT WOS:A1992MC52200005 ER PT J AU RUSZ, JE ANTONUCCI, JM EICHMILLER, F ANDERSON, MH AF RUSZ, JE ANTONUCCI, JM EICHMILLER, F ANDERSON, MH TI ADHESIVE PROPERTIES OF MODIFIED GLASS-IONOMER CEMENTS SO DENTAL MATERIALS LA English DT Article ID COMPOSITE RESINS; STRENGTH; BOND AB The incorporation of water-soluble polymers and/or vinyl monomers into glass-ionomer cements can yield toughened "hybrid cement-composites". This study compared a commercial water-hardening glass-ionomer cement and seven experimental hybrids in their bonding to both dentin and Silar composite. The cements were sanded and phosphoric-acid-etched or left with an unaltered matrix-formed surface when adhesion to composite was tested. The seven hybrids included: 15% 2-hydroxyethyl methacrylate (HEMA) with appropriate initiators/activators, 29% HEMA, 27% HEMA + 0.5% polyacrylic acid (PAA), 0.5% PAA, 1.5% PAA, 2.5% polyvinyl alcohol, and 2.5% gelatin. Acceptable bond strengths to applied composite and to dentin were observed for most of the modified hybrid cements. There were higher bond strengths with composite when the hybrids were left unetched. Bonding of some unetched, HEMA-containing cements achieved bond strengths (29% HEMA, 10.09 MPa) significantly higher than those of the unmodified cement (4.92 MPa). Resin-modified cements may promote better bonding by improved interaction and compatibility with the resin component of the composite. C1 USN,SCH DENT,DEPT OPERAT DENT,BETHESDA,MD 20814. USN,SCH DENT,BETHESDA,MD 20814. NATL INST STAND & TECHNOL,DIV POLYMERS,DENT & MAT GRP,GAITHERSBURG,MD. AMER DENT ASSOC,HLTH FDN PRC,GAITHERSBURG,MD. FU NIDCD NIH HHS [NMRDC M0095-06-3014]; NIDCR NIH HHS [NIDRIA #Y01 DE30001] NR 27 TC 30 Z9 30 U1 1 U2 2 PU ACAD DENTAL MATERIALS PI DALLAS PA BAYLOR COLLEGE DENTISTRY, 3302 GASTON AVE, DALLAS, TX 75266-0677 SN 0109-5641 J9 DENT MATER JI Dent. Mater. PD JAN PY 1992 VL 8 IS 1 BP 31 EP 36 DI 10.1016/0109-5641(92)90050-M PG 6 WC Dentistry, Oral Surgery & Medicine; Materials Science, Biomaterials SC Dentistry, Oral Surgery & Medicine; Materials Science GA HL975 UT WOS:A1992HL97500007 PM 1387853 ER PT J AU GIRGIS, NI FARID, Z KILPATRICK, ME PODGORE, JK SULTAN, Y AF GIRGIS, NI FARID, Z KILPATRICK, ME PODGORE, JK SULTAN, Y TI AZTREONAM COMPARED TO CHLORAMPHENICOL IN THE TREATMENT OF ENTERIC FEVERS SO DRUGS UNDER EXPERIMENTAL AND CLINICAL RESEARCH LA English DT Article ID MULTIRESISTANT SALMONELLA-TYPHI AB Fifty-seven patients, twenty-six males and thirty-one females, aged 6 to 50 years (mean 12.6 years) with proven Salmonella typhi or S. paratyphi A septicaemia, were treated in an open randomized parallel study with either aztreonam or chloramphenicol. Aztreonam was given intramuscularly at a level of 50 to 80 mg/kg body weight per dose every 8 h for 7 days to thirty patients. Chloramphenicol was given orally in a dose of 50 to 70 mg/kg body weight every 6 h for 12 days to twenty-seven patients. All patients responded rapidly to treatment, becoming afebrile and asymptomatic within 5.5 to 6.4 days. Only one patient on aztreonam relapsed following treatment, whereas three patients relapsed after chloramphenicol treatment. There were no serious side effects with either drug. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. MINIST HLTH CAIRO,ABBASSIA FEVER HOSP,CAIRO,EGYPT. NR 11 TC 4 Z9 4 U1 0 U2 0 PU BIOSCIENCE EDIPRINT INC PI CAROUGE PA RUE ALEXANDRE-GAVARD 16, 1227 CAROUGE, SWITZERLAND SN 0378-6501 J9 DRUG EXP CLIN RES JI Drug Exp. Clin. Res PY 1992 VL 18 IS 5 BP 197 EP 199 PG 3 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA JY767 UT WOS:A1992JY76700006 PM 1490435 ER PT J AU LANZANO, P AF LANZANO, P TI THE MOTION 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. Within the constraints of the geostrophic approximation of hydrodynamics, we determine the equation that governs the motion of a vortex tube within this rotating ocean. This vorticity equation turns out to be a nonlinear partial differential equation of the third order for the stream function of the motion. We next examine the existence of particular solutions to the vorticity equation that represent travelling waves of permanent form but decaying at infinity. A particular solution is obtained in terms of I1 and K1, the modified Bessel functions of order one. The question whether these localized vortices that move like solitary waves could even be solitons depends on their behavior during and after collision with each other and has not yet been resolved. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 12 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 JAN PY 1992 VL 56 IS 1 BP 75 EP 82 DI 10.1007/BF00054603 PG 8 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA HM637 UT WOS:A1992HM63700008 ER PT J AU KANG, YH LEE, CH MONROY, RL DWIVEDI, RS ODEYALE, C NEWBALL, HH AF KANG, YH LEE, CH MONROY, RL DWIVEDI, RS ODEYALE, C NEWBALL, HH TI UPTAKE, DISTRIBUTION AND FATE OF BACTERIAL LIPOPOLYSACCHARIDES IN MONOCYTES AND MACROPHAGES - AN ULTRASTRUCTURAL AND FUNCTIONAL CORRELATION SO ELECTRON MICROSCOPY REVIEWS LA English DT Review ID TUMOR-NECROSIS-FACTOR; ACUTE-PHASE REACTANT; RAT KUPFFER CELLS; ESCHERICHIA-COLI LIPOPOLYSACCHARIDE; HUMAN POLYMORPHONUCLEAR LEUKOCYTES; THURINGIENSIS DELTA-ENDOTOXINS; BRUSH-BORDER MEMBRANE; NATURAL-KILLER-CELLS; A-BINDING-SITES; BACILLUS-THURINGIENSIS AB Bacterial lipopolysaccharides (LPS), which are important components of the cell wall of gram-negative bacteria, induce a number of host responses both beneficial and harmful. The present review elucidates the uptake, distribution and functions of LPS in mononuclear phagocytes in an attempt to gain an insight into the mechanisms which control the pathogenesis of LPS mediated septic shock, The unique feature of LPS bilayer structure, the tagged LPS and antibodies to LPS provide means for studying binding, uptake, fate and subcellular distribution of LPS in tissues and cells. LPS bind to monocytes and macrophages by specific interaction via receptors such as scavenger receptors, CD14 and CD18 and by non-specific interactions, and enter the cells via receptor-mediated endocytosis, absorptive pinocytosis, phagocytosis, and diffusion. The ingested LPS are localized in pinocytic vesicles, phagocytic vacuoles, cytoplasm, mitochondria, rough endoplasmic reticulum, Golgi apparatus, and nucleus. The interactions of LPS with monocytes and macrophages trigger a broad spectrum of cellular responses. including production of important bioactive factors or mediators, such as IL-1, TNF, interferons, prostaglandins. and macrophage-derived growth factor. which are implicated in the pathogenesis of septic shock and wound healing. However, there is no conclusive evidence indicating that production of the mediators can only be induced through specific interactions. C1 HOWARD UNIV,DEPT BOT,WASHINGTON,DC 20059. RP KANG, YH (reprint author), USN,MED RES INST,BETHESDA,MD 20889, USA. NR 209 TC 31 Z9 31 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0892-0354 J9 ELECTRON MICROSC REV PY 1992 VL 5 IS 2 BP 381 EP 419 DI 10.1016/0892-0354(92)90016-J PG 39 WC Microbiology; Microscopy SC Microbiology; Microscopy GA HP204 UT WOS:A1992HP20400007 PM 1581555 ER PT J AU WRIGHT, DG LUCAS, DL KNIGHT, RD LARUSSA, VF KESSLER, SW CUTTING, MA BEDNAREK, JM AF WRIGHT, DG LUCAS, DL KNIGHT, RD LARUSSA, VF KESSLER, SW CUTTING, MA BEDNAREK, JM TI METABOLIC EVENTS THAT PROMOTE THE TERMINAL MATURATION OF HEMATOPOIETIC PROGENITOR CELLS SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract ID INOSINE MONOPHOSPHATE DEHYDROGENASE; ERYTHROID-DIFFERENTIATION; LEUKEMIA-CELLS; INHIBITORS; INDUCTION; HL-60; LINE C1 WALTER REED ARMY MED CTR,DEPT HEMATOL,WASHINGTON,DC 20307. USN,MED RES INST,BETHESDA,MD. NR 11 TC 2 Z9 2 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 JAN PY 1992 VL 20 IS 1 BP 141 EP 142 PG 2 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA GX273 UT WOS:A1992GX27300100 ER PT J AU GOODMAN, IR NGUYEN, HT AF GOODMAN, IR NGUYEN, HT TI UNCERTAINTY MODELS FOR KNOWLEDGE-BASED SYSTEM SO EXPERT SYSTEMS WITH APPLICATIONS LA English DT Software Review RP GOODMAN, IR (reprint author), USN,OCEAN SYST CTR,SAN DIEGO,CA, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0957-4174 J9 EXPERT SYST APPL JI Expert Syst. Appl. PY 1992 VL 4 IS 2 BP 268 EP 268 PG 1 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic; Operations Research & Management Science SC Computer Science; Engineering; Operations Research & Management Science GA HG384 UT WOS:A1992HG38400016 ER PT J AU KRUGER, J LILLARD, RS STREINZ, CC MORAN, PJ AF KRUGER, J LILLARD, RS STREINZ, CC MORAN, PJ TI EFFECT OF MICROSTRUCTURE ON PASSIVE FILM FORMATION AND BREAKDOWN OF AL-TA ALLOYS SO FARADAY DISCUSSIONS LA English DT Article; Proceedings Paper CT GENERAL DISCUSSION ON THE LIQUID/SOLID INTERFACE AT HIGH RESOLUTION CY SEP 07-09, 1992 CL UNIV NEWCASTLE UPON TYNE, NEWCASTLE UPON TYNE, ENGLAND HO UNIV NEWCASTLE UPON TYNE ID DYNAMIC IMAGING MICROELLIPSOMETRY; ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; SPUTTERED ALUMINUM; THIN-FILMS; CORROSION AB Two in situ techniques dynamic imaging microellipsometry (DIM) and local electrochemical impedance spectroscopy (LEIS), have been applied to a study of the effect of microstructure on passive film formation and breakdown on Al-Ta alloys. DIM acquires ellipsometric data (thickness and optical constants of the films on surfaces) at a spatial resolution of ca. 20 mum using a radiometric full-field imaging approach. LEIS is an electrochemical impedance technique that generates local a.c. impedance data by measuring a.c. solution current densities very near the microstructural features of an electrode surface. The DIM technique was used to look at passive film formation at (a) the Al3Ta precipitate, (b) the dealloyed zone adjacent to the precipitate and (c) the solid solution phase that is present in Al-Ta alloys. The DIM technique observed different film thicknesses and optical constants for the films that form on these phases at potentials in the passive regions. The LEIS technique was used to study the precipitate and the region surrounding it under conditions where passive film breakdown occurs. Using these techniques, insight was obtained into the passive film formation and breakdown processes that control localized corrosion. C1 USN ACAD, ANNAPOLIS, MD 21402 USA. RP KRUGER, J (reprint author), JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. NR 21 TC 6 Z9 6 U1 0 U2 1 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0301-7249 J9 FARADAY DISCUSS JI Faraday Discuss. PY 1992 VL 94 BP 127 EP 136 DI 10.1039/fd9929400127 PG 10 WC Chemistry, Physical SC Chemistry GA MA449 UT WOS:A1992MA44900009 ER PT J AU ANDERSON, GP GOLDEN, JP SHRIVERLAKE, LC LIGLER, FS AF ANDERSON, GP GOLDEN, JP SHRIVERLAKE, LC LIGLER, FS TI OPTIMIZATION OF SENSOR PROBE TAPER ANGLE FOR A FIBER OPTIC BIOSENSOR SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RI Anderson, George/D-2461-2011 OI Anderson, George/0000-0001-7545-9893 NR 0 TC 3 Z9 3 U1 0 U2 2 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A169 EP A169 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44000965 ER PT J AU BEZRUKOV, SM VODYANOY, I AF BEZRUKOV, SM VODYANOY, I TI POLYMER-INDUCED ELECTRICAL NOISE IN THE OPEN ION CHANNEL SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV MARYLAND,COLLEGE PK,MD 20742. USN,OFF RES,ARLINGTON,VA 22217. UNIV CALIF IRVINE,IRVINE,CA 92717. NR 0 TC 0 Z9 0 U1 1 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A114 EP A114 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44000660 ER PT J AU CHANG, EL AF CHANG, EL TI FOURIER-TRANSFORM INFRARED-SPECTROSCOPY ANALYSIS OF VALINOMYCIN IN SOLVENTS AND LIPID-MEMBRANES SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A87 EP A87 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44000500 ER PT J AU CHING, WM PAN, CJ DASCH, GA AF CHING, WM PAN, CJ DASCH, GA TI LIMITED PROTEOLYTIC CLEAVAGE OF THE MAJOR SURFACE PROTEIN ANTIGENS OF RICKETTSIA-TYPHI AND R-PROWAZEKII - KINETICS AND SEQUENCE SPECIFICITY SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,RICKETTSIAC DIS PROGRAM,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A183 EP A183 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44001044 ER PT J AU DAMODARAN, KV MERZ, KM GABER, BP AF DAMODARAN, KV MERZ, KM GABER, BP TI MOLECULAR-DYNAMICS SIMULATION OF THE DILAUROYL-PHOSPHATIDYLETHANOLAMINE (DLPE) BILAYER SO FASEB JOURNAL LA English DT Meeting Abstract C1 PENN STATE UNIV,DEPT CHEM,UNIV PK,PA 16802. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 2 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A271 EP A271 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44001560 ER PT J AU GABER, BP HYBL, A SINGH, A HANNICK, L WARD, K AF GABER, BP HYBL, A SINGH, A HANNICK, L WARD, K TI SINGLE-CRYSTALS OF A POLYMERIZABLE LIPID - PREPARATION AND INITIAL CHARACTERIZATION SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A502 EP A502 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44002886 ER PT J AU KELLER, SL BEZRUKOV, SM GRUNER, SM VODYANOY, I PARSEGIAN, VA AF KELLER, SL BEZRUKOV, SM GRUNER, SM VODYANOY, I PARSEGIAN, VA TI RELATIVE PROBABILITY OF ALAMETHICIN CONDUCTANCE STATES VARIES WITH LIPID SPONTANEOUS CURVATURE SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV MARYLAND,COLLEGE PK,MD 20742. PRINCETON UNIV,PRINCETON,NJ 08544. USN,OFF RES,ARLINGTON,VA 22217. NIH,BETHESDA,MD 20892. RI Gruner, Sol/G-2924-2010 OI Gruner, Sol/0000-0002-1171-4426 NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A115 EP A115 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44000663 ER PT J AU PEEK, BM NAMBOODIRI, K SINGH, A GABER, BP AF PEEK, BM NAMBOODIRI, K SINGH, A GABER, BP TI CHARACTERIZATION OF THE POLYMER OF A POLYMERIZABLE DIACETYLENIC LIPID SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A502 EP A502 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44002887 ER PT J AU RATNA, BR RUDOLPH, AS KAHN, B AF RATNA, BR RUDOLPH, AS KAHN, B TI SELF-ASSEMBLING PHOSPHOLIPID FILAMENTS SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM,WASHINGTON,DC 20007. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 0 TC 0 Z9 0 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A129 EP A129 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44000744 ER PT J AU RATNA, BR BARALTOSH, S KAHN, B SCHNUR, JM RUDOLPH, AS AF RATNA, BR BARALTOSH, S KAHN, B SCHNUR, JM RUDOLPH, AS TI EFFECT OF ALCOHOL CHAIN-LENGTH ON TUBULE FORMATION IN 1,2 - BIS (10,12-TRICOSADIYNOYL)-SN-GLYCERO-3-PHOSPHOCHOLINE SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 2 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A502 EP A502 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44002883 ER PT J AU SCHOEN, PE BEHROOZI, F HYBL, A SINGH, A GABER, BP AF SCHOEN, PE BEHROOZI, F HYBL, A SINGH, A GABER, BP TI CRYSTALLIZED P-TOLUENE SULFONATE DIACETYLENIC LIPID - A RAMAN-SPECTROSCOPIC STUDY SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. UNIV WISCONSIN PARKSIDE,DEPT PHYS,KENOSHA,WI 53140. UNIV MARYLAND,SCH MED,DEPT BIOPHYS,BALTIMORE,MD 21201. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A502 EP A502 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44002884 ER PT J AU SINGH, A TSAO, LI GABER, BP AF SINGH, A TSAO, LI GABER, BP TI METAL-ION INDUCED PHASE-CHANGES IN LIPID VESICLES - BUILDING A MEMBRANE ASSISTED RECEPTOR/TRANSDUCER SYSTEM SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. GEORGETOWN UNIV,DEPT BIOCHEM & MOLEC BIOL,WASHINGTON,DC 20007. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A242 EP A242 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44001390 ER PT J AU TURNER, DC GABER, BP AF TURNER, DC GABER, BP TI THE EFFECT OF THE FUSION INHIBITING PEPTIDE Z-(D)-PHE-PHE-GLY ON THE MONOLAYER CURVATURE OF PHOSPHOLIPID-MEMBRANES SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 3 TC 0 Z9 0 U1 1 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A86 EP A86 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44000496 ER PT J AU VODYANOY, I BEZRUKOV, SM COLOMBINI, M AF VODYANOY, I BEZRUKOV, SM COLOMBINI, M TI MEASUREMENT OF ION CHANNEL ACCESS RESISTANCE SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV MARYLAND,COLLEGE PK,MD 20742. USN,OFF RES,ARLINGTON,VA 22217. RI Colombini, Marco/A-1540-2014 NR 0 TC 2 Z9 2 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD JAN 1 PY 1992 VL 6 IS 1 BP A114 EP A114 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA GY440 UT WOS:A1992GY44000658 ER PT J AU SINGH, DJ BOYER, LL AF SINGH, DJ BOYER, LL TI 1ST PRINCIPLES ANALYSIS OF VIBRATIONAL-MODES IN KNBO3 SO FERROELECTRICS LA English DT Article; Proceedings Paper CT 2ND WILLIAMSBURG WORKSHOP ON FIRST PRINCIPLES CALCULATIONS FOR FERROELECTRICS CY FEB 02-04, 1992 CL WILLIAMSBURG, VA SP CARNEGIE INST WASHINGTON, GORDON & BREACH SCI PUBL, USN, OFF NAVAL RES DE KNBO3; PHONONS; LOCAL DENSITY APPROXIMATION; FERROELECTRICS; LATTICE DYNAMICS ID ELECTRONIC-STRUCTURE; PHASE-TRANSITIONS; TOTAL-ENERGY; APPROXIMATION; PRESSURE AB The vibrational modes in KNbO3 are analyzed using first principles total-energy calculations based on local density functional theory. Normal mode frequencies and eigenvectors are determined for the cubic perovskite structure with wave vectors at the center (GAMMA) and corner (R) of the Brillouin zone using the frozen-phonon technique. The frequencies are in good agreement with available experimental results with the possible exception of the lowest-frequency zone-center (ferroelectric) mode. Our calculations give a ferroelectric mode which becomes unstable with increasing volume. However, at the equilibrium volume it is stable with a frequency of approximately 100 cm-1. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 15 TC 107 Z9 107 U1 0 U2 8 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0015-0193 J9 FERROELECTRICS PY 1992 VL 136 IS 1-4 BP 95 EP 103 DI 10.1080/00150199208016069 PG 9 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KN563 UT WOS:A1992KN56300010 ER PT J AU KRAKAUER, H YU, R ZHANG, Q HAAS, C SINGH, D LIU, A AF KRAKAUER, H YU, R ZHANG, Q HAAS, C SINGH, D LIU, A TI LINEAR RESPONSE CALCULATIONS USING LAPW AND MIXED BASIS METHODS SO FERROELECTRICS LA English DT Article; Proceedings Paper CT 2ND WILLIAMSBURG WORKSHOP ON FIRST PRINCIPLES CALCULATIONS FOR FERROELECTRICS CY FEB 02-04, 1992 CL WILLIAMSBURG, VA SP CARNEGIE INST WASHINGTON, GORDON & BREACH SCI PUBL, USN, OFF NAVAL RES DE LINEAR RESPONSE; LAPW; MIXED BASIS; ELECTRONIC STRUCTURE ID TOTAL-ENERGY CALCULATIONS; PLANE-WAVE METHOD; ELECTRONIC-STRUCTURE; MOLECULAR-DYNAMICS; CONSTANTS; SOLIDS; COPPER AB We discuss the use of two alternative basis sets to carry out practical linear response calculations for systems containing transition metal and first row atoms, which exhibit poor convergence in plane-wave based methods. The first approach uses augmented plane-waves as in the LAPW method, and the second uses a new mixed basis method. The relative merits and disadvantages of these are considered. We also discuss the newly introduced projector basis technique that permits Car-Parrinello scaling for the computational workload for both of these methods. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP KRAKAUER, H (reprint author), COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23187, USA. RI Singh, David/I-2416-2012; Liu, Amy/E-2266-2015 OI Liu, Amy/0000-0002-2011-1854 NR 27 TC 2 Z9 2 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0015-0193 J9 FERROELECTRICS PY 1992 VL 136 IS 1-4 BP 105 EP 112 DI 10.1080/00150199208016070 PG 8 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KN563 UT WOS:A1992KN56300011 ER PT J AU FLOCKEN, JW GUENTHER, RA HARDY, JR BOYER, LL AF FLOCKEN, JW GUENTHER, RA HARDY, JR BOYER, LL TI A DOUBLE WELL OSCILLATOR MODEL FOR THE FERROELECTRIC PHASE-TRANSITION IN SBSI SO FERROELECTRICS LA English DT Article AB The dielectric response spectrum for antimony sulfoiodide has been computed using a model in which the material is simulated by a damped double well oscillator. It is found that with the use of simple damping and relaxation terms and realistic well parameters the experimental dielectric response, including the central peak, can be reproduced quite closely. The choice of well depth, in particular, plays a major role in determining the frequency of the first peak above the soft mode. C1 UNIV NEBRASKA,DEPT PHYS,LINCOLN,NE 68588. USN,RES LAB,WASHINGTON,DC 20375. RP FLOCKEN, JW (reprint author), UNIV NEBRASKA,DEPT PHYS,OMAHA,NE 68182, USA. NR 14 TC 9 Z9 9 U1 0 U2 1 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0015-0193 J9 FERROELECTRICS PY 1992 VL 135 IS 1-4 BP 309 EP 318 DI 10.1080/00150199208230035 PG 10 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KK684 UT WOS:A1992KK68400035 ER PT J AU SMITH, WA AF SMITH, WA TI MAXIMAL ELECTROMECHANICAL COUPLING IN PIEZOELECTRIC CERAMICS - ITS EFFECTIVE EXPLOITATION IN ACOUSTIC TRANSDUCERS SO FERROELECTRICS LA English DT Article; Proceedings Paper CT 2ND EUROPEAN CONF ON THE APPLICATION OF POLAR DIELECTRICS / 1ST INTERNATIONAL WORKSHOP ON INTEGRATED FERROELECTRICS CY APR 12-15, 1992 CL LONDON, ENGLAND SP DEF ADV RES PROJECTS AGCY, GORDON & BREACH SCI PUBL, DIELECT SOC, COOKSONS, GEC MARCONI MAT TECHNOL GRP AB The stress patterns-two shears and one direct stress-that are maximally coupled to the electric field in piezoelectric ceramics are identified. This is achieved by a simplifying initial choice of coordinate axes in the ceramic's thermodynamic phase space and by a subsequent sequence of elementary coordinate changes-rotations and scale changes; simple physical arguments lead to the new coordinates. The utility of this perspective is pointed out in two important applications of piezoceramics in acoustic transducers: naval hydrophone sensors and pulse-echo ultrasonic transducers used in medical diagnostic imaging. C1 USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32856. RP SMITH, WA (reprint author), OFF NAVAL RES,DIV MAT,ARLINGTON,VA 22217, USA. NR 10 TC 1 Z9 1 U1 1 U2 2 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0015-0193 J9 FERROELECTRICS PY 1992 VL 134 IS 1-4 BP 145 EP 150 DI 10.1080/00150199208015579 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KG158 UT WOS:A1992KG15800025 ER PT J AU TING, RY SHAULOV, AA SMITH, WA AF TING, RY SHAULOV, AA SMITH, WA TI EVALUATION OF THE PROPERTIES OF 1-3 PIEZOCOMPOSITES OF A NEW LEAD TITANATE IN EPOXY-RESINS SO FERROELECTRICS LA English DT Article ID COMPOSITES AB By using a new calcium-modified lead titanate ceramic with a near-zero planar coupling coefficient, a series of 1-3 piezocomposite samples was fabricated with a dice-and-fill technique. The ceramic rods were approximately 0.10 mm in size, and the percent of ceramic loading varied from 10 to 30%. Two epoxy resins with different glass transition temperatures and moduli were used. The dielectric properties and the piezoelectric d(h) and g(h) coefficients of the composites were measured as a function of pressure and temperature and were found to exhibit little variation, but 10-25% lower than theoretical predictions. A prototype hydrophone made from one of the piezocomposite samples was tested to show a constant free-field voltage sensitivity of -201 dB re V/muPa from 100 Hz to 6 kHz. C1 OFF NAVAL RES,ARLINGTON,VA 22217. PHILIPS LABS,BRIARCLIFF MANOR,NY 10510. RP TING, RY (reprint author), USN,RES LAB,POB 568337,ORLANDO,FL 32856, USA. NR 12 TC 3 Z9 3 U1 0 U2 1 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0015-0193 J9 FERROELECTRICS PY 1992 VL 132 IS 1-4 BP 69 EP 77 DI 10.1080/00150199208009073 PG 9 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KF210 UT WOS:A1992KF21000008 ER PT B AU BERKOFF, TA KERSEY, AD AF BERKOFF, TA KERSEY, AD BE Claus, RO TI LOW-COHERENCE INTERFEROMETRIC-BASED TECHNIQUES FOR HIGH-RESOLUTION REMOTE DETECTION OF STRAIN USING 2-MODE AND BRAGG GRATING FIBER SENSORS SO FIBER OPTIC SENSOR-BASED SMART MATERIALS AND STRUCTURES SE SMART MATERIALS AND STRUCTURES SERIES LA English DT Proceedings Paper CT 5th Annual Smart Materials and Structures Workshop CY APR 15-16, 1992 CL VIRGINIA TECH, FIBER & ELECTRO OPT RES CTR, BLACKSBURG, VA HO VIRGINIA TECH, FIBER & ELECTRO OPT RES CTR C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. 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 BN 0-7503-0248-8 J9 SMAR MAT ST PY 1992 BP 39 EP 44 PG 6 WC Computer Science, Artificial Intelligence; Materials Science, Characterization & Testing; Optics SC Computer Science; Materials Science; Optics GA BA62T UT WOS:A1992BA62T00007 ER PT B AU ASKINS, CG TSAI, TE WILLIAMS, GM PUTNAM, MA BASHKANSKY, M FRIEBELE, EJ AF ASKINS, CG TSAI, TE WILLIAMS, GM PUTNAM, MA BASHKANSKY, M FRIEBELE, EJ BE Claus, RO TI SINGLE-PULSE FORMATION OF FIBER BRAGG GRATINGS SO FIBER OPTIC SENSOR-BASED SMART MATERIALS AND STRUCTURES SE SMART MATERIALS AND STRUCTURES SERIES LA English DT Proceedings Paper CT 5th Annual Smart Materials and Structures Workshop CY APR 15-16, 1992 CL VIRGINIA TECH, FIBER & ELECTRO OPT RES CTR, BLACKSBURG, VA HO VIRGINIA TECH, FIBER & ELECTRO OPT RES CTR C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX BN 0-7503-0248-8 J9 SMAR MAT ST PY 1992 BP 85 EP 88 PG 4 WC Computer Science, Artificial Intelligence; Materials Science, Characterization & Testing; Optics SC Computer Science; Materials Science; Optics GA BA62T UT WOS:A1992BA62T00015 ER PT S AU KURFESS, JD AF KURFESS, JD BE Mendell, RB Mincer, AI TI GAMMA-RAY ASTROPHYSICS - DEVELOPMENT AND FUTURE-PROSPECTS SO FRONTIERS IN COSMIC PHYSICS: SYMPOSIUM IN MEMORY OF SERGE ALEXANDER KORFF SE ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Proceedings Paper CT SYMP ON FRONTIERS IN COSMIC PHYSICS, IN MEMORY OF SERGE ALEXANDER KORFF CY SEP 13, 1990 CL NEW YORK, NY SP NYU, PHYS DEPT RP KURFESS, JD (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA NEW YORK SN 0077-8923 BN 0-89766-721-2 J9 ANN NY ACAD SCI JI Ann.NY Acad.Sci. PY 1992 VL 655 BP 292 EP 308 DI 10.1111/j.1749-6632.1992.tb17078.x PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BW52W UT WOS:A1992BW52W00027 ER PT J AU UHM, HS LEE, WM AF UHM, HS LEE, WM TI HIGH-CONCENTRATION OF DEUTERIUM IN PALLADIUM SO FUSION TECHNOLOGY LA English DT Note DE DEUTERIUM CONCENTRATION IN PALLADIUM; PLASMA ION IMPLANTATION; TEMPERATURE GRADIENT ID COLD FUSION; HYDROGEN AB Based on theoretical calculations, new schemes to increase the deuterium density in palladium over its initial value are presented. A high deuterium concentration in palladium is needed for application to solid-state fusion. The first deuterium enrichment scheme makes use of plasma ion implantation, which consists of a cylindrical palladium rod (target) preloaded with deuterium atoms, coated with diffusion barrier material, and immersed in a deuterium plasma. The palladium rod is connected to a high-power modulator, which provides a series of negative voltage pulses. During these negative pulses, deuterium ions fall on the target, penetrate the diffusion barrier, and are implanted inside the palladium. For reasonable system parameters allowed by current technology, theoretical calculations indicate that the saturation deuterium density after prolonged ion implantation can be several times the palladium atomic number density. The second deuterium enrichment scheme makes use of temperature gradient effects on the deuterium solubility in palladium. A heat source at temperature T2 and a heat sink at temperature T1 (where T2 > T1) are in contact with two different parts of a palladium sample, which has been presoaked with deuterium atoms and has been coated with diffusion barrier material or has been securely locked in a metal case. The temperature gradient created in the sample from such an arrangement forces the deuterium atoms in the hot region to migrate into the cold region, resulting in higher deuterium density in the cold region. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK,SILVER SPRING,MD 20903, USA. NR 15 TC 1 Z9 1 U1 1 U2 2 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD JAN PY 1992 VL 21 IS 1 BP 75 EP 81 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GW874 UT WOS:A1992GW87400008 ER PT B AU NORDQUIST, PER HENRY, RL BLAKEMORE, JS GORMAN, RJ SABAN, SB AF NORDQUIST, PER HENRY, RL BLAKEMORE, JS GORMAN, RJ SABAN, SB BE STRINGFELLOW, GB TI DEFECTS IN VERTICAL ZONE MELT (VZM) GAAS SO GALLIUM ARSENIDE AND RELATED COMPOUNDS 1991 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 18TH INTERNATIONAL SYMP ON GALLIUM ARSENIDE AND RELATED COMPOUNDS CY SEP 09-12, 1991 CL SEATTLE, WA SP AIR FORCE OFF SCI RES, BANDGAP TECHNOL, BOEING SCI & TECHNOL CTR, FISONS INSTRUMENTS, IEEE, SIEMENS ID SEMI-INSULATING GAAS; CRYSTALS RP NORDQUIST, PER (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 BRISTOL BN 0-85498-410-0 J9 INST PHYS CONF SER PY 1992 VL 120 BP 61 EP 66 PG 6 WC Physics, Condensed Matter SC Physics GA BV60K UT WOS:A1992BV60K00011 ER PT B AU GASKILL, DK BOTTKA, N STAUF, G BERRY, AK AF GASKILL, DK BOTTKA, N STAUF, G BERRY, AK BE STRINGFELLOW, GB TI SEMIINSULATING INP CHARACTERIZED BY PHOTOREFLECTANCE SO GALLIUM ARSENIDE AND RELATED COMPOUNDS 1991 SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 18TH INTERNATIONAL SYMP ON GALLIUM ARSENIDE AND RELATED COMPOUNDS CY SEP 09-12, 1991 CL SEATTLE, WA SP AIR FORCE OFF SCI RES, BANDGAP TECHNOL, BOEING SCI & TECHNOL CTR, FISONS INSTRUMENTS, IEEE, SIEMENS ID MODULATION SPECTROSCOPY RP GASKILL, DK (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 BRISTOL BN 0-85498-410-0 J9 INST PHYS CONF SER PY 1992 VL 120 BP 259 EP 262 PG 4 WC Physics, Condensed Matter SC Physics GA BV60K UT WOS:A1992BV60K00051 ER PT J AU WILDERMUTH, RE AF WILDERMUTH, RE TI THE MILITARY AND THE MEDIA - THEY CAN BOTH WIN SO GOVERNMENT INFORMATION QUARTERLY LA English DT Article AB This article addresses concerns raised by both the media and the military public affairs officers charged to support them, during Desert Shield: Storm. Public affairs acted as a catalyst between two verv diverse organizations with differing goals and methods. The military was concerned about operational security, while the media wanted complete freedom. Since neither position, in the extreme, represents a just or workable solution, a compromise must be introducted. This article attempts to offer solutions to the concerns raised and to bring both sides closer together. RP WILDERMUTH, RE (reprint author), USN,HQ,US CENT COMMAND,CCPA,MACDILL AFB,FL 33608, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU JAI PRESS INC PI GREENWICH PA 55 OLD POST RD-#2, PO BOX 1678, GREENWICH, CT 06836-1678 SN 0740-624X J9 GOV INFORM Q JI Gov. Inf. Q. PY 1992 VL 9 IS 4 BP 409 EP 417 DI 10.1016/0740-624X(92)90065-T PG 9 WC Information Science & Library Science SC Information Science & Library Science GA KB813 UT WOS:A1992KB81300002 ER PT J AU SEIDELMANN, PK AF SEIDELMANN, PK TI SECULAR VARIATIONS IN OPTICAL OBSERVATIONS OF PLANETS - SUMMARY SO IAU SYMPOSIA LA English DT Article RP SEIDELMANN, PK (reprint author), USN OBSERV,WASHINGTON,DC 20390, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0074-1809 J9 IAU SYMP PY 1992 IS 152 BP 49 EP 51 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ252 UT WOS:A1992JJ25200008 ER PT J AU LEVISON, HF AF LEVISON, HF TI THE LONG-TERM DYNAMIC BEHAVIOR OF SMALL BODIES IN THE KUIPER BELT SO IAU SYMPOSIA LA English DT Article ID SHORT-PERIOD COMETS; ORIGIN RP LEVISON, HF (reprint author), USN OBSERV,DEPT ORBITAL MECH,WASHINGTON,DC 20392, USA. RI Levison, Harold/C-6061-2013 OI Levison, Harold/0000-0001-5847-8099 NR 4 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0074-1809 J9 IAU SYMP PY 1992 IS 152 BP 275 EP 279 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ252 UT WOS:A1992JJ25200041 ER PT B AU SCHADOW, KC HENDRICKS, EW HANSEN, RJ AF SCHADOW, KC HENDRICKS, EW HANSEN, RJ GP INT COUNCIL AERONAUT SCI TI RECENT PROGRESS IN THE IMPLEMENTATION OF ACTIVE COMBUSTION CONTROL SO ICAS PROCEEDINGS 1992, VOLS 1 AND 2: 18TH CONGRESS OF THE INTERNATIONAL COUNCIL OF THE AERONAUTICAL SCIENCES LA English DT Proceedings Paper CT 18th Congress of the International-Council-of-the-Aeronautical-Sciences CY SEP 20-25, 1992 CL BEIJING, PEOPLES R CHINA SP INT COUNCIL AERONAUT SCI C1 USN,DIV AIR WARFARE CTR WEAPONS,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-046-2 PY 1992 BP 942 EP 952 PG 11 WC Engineering, Aerospace SC Engineering GA BA84L UT WOS:A1992BA84L00124 ER PT J AU TUTTLE, JO AF TUTTLE, JO TI C4I FOR THE 21ST-CENTURY - A COMPLEX NEW-WORLD ORDER DEMANDS NEW TECHNOLOGY, NEW DOCTRINE, AND NEW APPROACHES TO GLOBAL SECURITY SO IEEE COMMUNICATIONS MAGAZINE LA English DT Article C1 USN,NAVAL OPER,OP 094,WASHINGTON,DC 20350. RP TUTTLE, JO (reprint author), USN,SPACE & ELECTR WARFARE OFF CHIEF NAVAL OPERAT,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 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 0163-6804 J9 IEEE COMMUN MAG JI IEEE Commun. Mag. PD JAN PY 1992 VL 30 IS 1 BP 48 EP 50 DI 10.1109/35.166649 PG 3 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GZ849 UT WOS:A1992GZ84900009 ER PT J AU SULLIVAN, EJ CAREY, WM STERGIOPOULOS, S AF SULLIVAN, EJ CAREY, WM STERGIOPOULOS, S TI SPECIAL ISSUE ON ACOUSTIC SYNTHETIC APERTURE PROCESSING SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Editorial Material ID TOWED ARRAY RP SULLIVAN, EJ (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 25 TC 10 Z9 10 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 JAN PY 1992 VL 17 IS 1 BP 1 EP 7 PG 7 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA GX350 UT WOS:A1992GX35000001 ER PT J AU NUTTALL, AH AF NUTTALL, AH TI THE MAXIMUM-LIKELIHOOD ESTIMATOR FOR ACOUSTIC SYNTHETIC APERTURE PROCESSING SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article AB The maximum likelihood estimator of source amplitude, bearing, and frequency for a moving towed line array of equispaced elements is addressed. A two-dimensional search in equivalent phase and frequency variables is found to yeild the best estimates of the unknown parameters. Application to a physical experiment and comparison with the Cramer-Rao bound verify the unity of the approach. RP NUTTALL, AH (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 3 TC 8 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JAN PY 1992 VL 17 IS 1 BP 26 EP 29 DI 10.1109/48.126951 PG 4 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA GX350 UT WOS:A1992GX35000004 ER PT J AU EDELSON, GS SULLIVAN, EJ AF EDELSON, GS SULLIVAN, EJ TI LIMITATIONS ON THE OVERLAP-CORRELATOR METHOD IMPOSED BY NOISE AND SIGNAL CHARACTERISTICS SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID TOWED-ARRAY; SYNTHETIC-APERTURE AB Limitations on the performance of the overlap-correlator method of forming a passive synthetic aperture are derived. This technique makes use of the overlap of the array in sequential positions to estimate a series of phase correction factors that compensate for the motion of the array over time. Therefore, it is of primary interest to optimize this overlap with respect to the effects of random noise. By minimizing the variance of the estimates of the set of phase correction factors, it is found that the optimal overlap is one-half the length of the physical array. Using this optimal overlap, the bounds on the unseable spatial response are then determined as a function of signal-to-noise ratio and the number of hydrophones in the physical array. Finally, the ability of the overlap-correlator algorithm to synthesize a coherent aperture is investigated for the case of multiple sources in the absence of noise. C1 USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. RP EDELSON, GS (reprint author), UNIV RHODE ISL,DEPT ELECT ENGN,KINGSTON,RI 02881, USA. NR 16 TC 11 Z9 11 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 JAN PY 1992 VL 17 IS 1 BP 30 EP 39 DI 10.1109/48.126952 PG 10 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA GX350 UT WOS:A1992GX35000005 ER PT J AU YEN, NC AF YEN, NC TI A CIRCULAR PASSIVE SYNTHETIC ARRAY - AN INVERSE PROBLEM APPROACH SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article AB The determination of the directions and/or locations for radiated sound (noise) sources in the open ocean is often a challenging problem in ocean engineering, particularly with the constraints in the available resources and the difficulties in the implementation for ocean deployment. Based on the general concept of the inverse acoustic radiation problem, the temporal scanning of a stationary acoustic field along a closed contour has been used to simplify the measurement approach for obtaining the necessary information on source directionality. The mathematical formulation is derived from a model of the two-dimensional acoustic field. A single moving sensor circling a fixed reference point forms a virtual circular aperture array. The sensor response is synthesized to provide directional analysis of acoustic pressure field due to the distance radiation sound sources. The fundamental relationship of the response of a single sensor moving a stationary acoustic field with a given distant source distribution is exploited to associated with the traditional beamforming approach. The formulation of the inverse problem is also investigated to establish a methodology for improving the angular resolution for the array processing. The fundamental relationship between the sound sources and the circular passive synthetic array is explored for utilizing existing mathematical methods and for developing the processing algorithm. This study further addresses other subjects of practical interest, such as directionality ambiguity, effect of Doppler frequency, interference noise, and processing gain. The concluding results can be used to establish the guideline for engineering design and deployment of this type of synthetic array, and to further exploit the new array signal processing technique. RP YEN, NC (reprint author), USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375, USA. NR 17 TC 5 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JAN PY 1992 VL 17 IS 1 BP 40 EP 47 DI 10.1109/48.126953 PG 8 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA GX350 UT WOS:A1992GX35000006 ER PT J AU EDELSON, GS TUFTS, DW AF EDELSON, GS TUFTS, DW TI ON THE ABILITY TO ESTIMATE NARROW-BAND SIGNAL PARAMETERS USING TOWED ARRAYS SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID PASSIVE SYNTHETIC ARRAYS; APERTURE AB Using the Cramer-Rao lower bound (CRLB) as an indicator of potential performance, we examine the limits on the estimation and resolution capabilities of a towed line array of uniformly spaced hydrophones to provide frequency and bearing information about narrow-band signals. It is assumed that a monochromatic plane wave arrives at the array from each source. Several versions of the bounds are computed using different assumptions about which parameters have known values and about the way in which samples are taken in space and in time. The CRLB values for different situations can be compared to provide information about the effective use of a moving aperture for estimation of the parameters of narrow-band signals arriving at the array. It is shown that adding at least one hydrophone occupying a fixed position in space can improve the bearing estimates of a towed array by supplying additional frequency information if both the bearings and frequencies of the sources are unknown. C1 USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. RP EDELSON, GS (reprint author), UNIV RHODE ISL,DEPT ELECT ENGN,KINGSTON,RI 02881, USA. NR 32 TC 23 Z9 26 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 JAN PY 1992 VL 17 IS 1 BP 48 EP 61 DI 10.1109/48.126954 PG 14 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA GX350 UT WOS:A1992GX35000007 ER PT J AU KUO, EYT AF KUO, EYT TI ACOUSTIC-WAVE SCATTERING FROM 2 SOLID BOUNDARIES AT THE OCEAN BOTTOM - REFLECTION LOSS SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID SURFACE SCATTERING; MODEL AB An acoustic wave scattering model is formulated and solved for three homogeneous layers consisting of a thin solid sediment layer sandwiched by semi-infinite water and solid basalt media. The model is then applied to two cases to analyze both the physical parameters affecting reflection loss and the effects of interface roughness scattering. The effects of attenuation in the sediment layer, especially of S waves, combine with conversion and scattering processes at the basalt interface to constitute the dominant mechanism of reflection loss, especially in the small grazing angle directions. The scattering process is found not only to produce the well-known acoustic energy loss from specular to nonspecular directions, but also to alter the conversion efficiency between P and S waves with a resulting loss or gain. RP KUO, EYT (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 16 TC 8 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JAN PY 1992 VL 17 IS 1 BP 159 EP 170 DI 10.1109/48.126964 PG 12 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA GX350 UT WOS:A1992GX35000017 ER PT J AU SCHEPS, R MYERS, JF AF SCHEPS, R MYERS, JF TI DOUBLY RESONANT TI-SAPPHIRE LASER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB A CW Ti:sapphire laser is described that operates simultaneously at two frequencies. This mode of operation was obtained with an intracavity dispersive prism and two separate feedback paths. An alternative means of achieving dual frequency operation was demonstrated using a birefringent filter. Repetitive Q-switching produced an increase in the range of wavelengths over which dual frequency operation was obtained. RP SCHEPS, R (reprint author), USN,CTR OCEAN SYST,CODE 754,SAN DIEGO,CA 92152, USA. NR 6 TC 19 Z9 19 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD JAN PY 1992 VL 4 IS 1 BP 1 EP 3 DI 10.1109/68.124855 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GY848 UT WOS:A1992GY84800001 ER PT J AU LUQI AF LUQI TI COMPUTER-AIDED PROTOTYPING FOR A COMMAND-AND-CONTROL SYSTEM USING CAPS SO IEEE SOFTWARE LA English DT Article RP LUQI (reprint author), USN,NAVAL POSTGRAD SCH,NPS 052,MONTEREY,CA 93943, USA. NR 10 TC 7 Z9 7 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 JAN PY 1992 VL 9 IS 1 BP 56 EP 67 DI 10.1109/52.108781 PG 12 WC Computer Science, Software Engineering SC Computer Science GA GY398 UT WOS:A1992GY39800013 ER PT J AU GERLACH, K KRETSCHMER, FF AF GERLACH, K KRETSCHMER, FF TI GENERAL FORMS AND PROPERTIES OF ZERO CROSS-CORRELATION RADAR WAVE-FORMS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article ID COMPLEMENTARY AB General forms for both the complementary and noncomplementary zero cross-correlation waveform sets are developed. Various properties of these codes and their relationship to zero sidelobe periodic codes are stated and proved. Also, some radar applications and practical considerations of using these codes are briefly discussed. RP GERLACH, K (reprint author), USN,RES LAB,DIV RADAR,CODE 5341,WASHINGTON,DC 20375, USA. NR 9 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JAN PY 1992 VL 28 IS 1 BP 98 EP 104 DI 10.1109/7.135436 PG 7 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HP654 UT WOS:A1992HP65400009 ER PT J AU BARNETT, J KEDEM, B AF BARNETT, J KEDEM, B TI ZERO-CROSSING RATES OF FUNCTIONS OF GAUSSIAN-PROCESSES - REPLY SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Note C1 UNIV MARYLAND,DEPT MATH,COLLEGE PK,MD 20742. UNIV MARYLAND,SYST RES CTR,COLLEGE PK,MD 20742. RP BARNETT, J (reprint author), NAVAL SURFACE WARFARE CTR,INFORMAT & MATH SCI BRANCH,SILVER SPRING,MD 20903, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD JAN PY 1992 VL 38 IS 1 BP 213 EP 213 PG 1 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA GV096 UT WOS:A1992GV09600036 ER PT J AU MERMELSTEIN, MD AF MERMELSTEIN, MD TI A MAGNETOELASTIC METALLIC-GLASS LOW-FREQUENCY MAGNETOMETER SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article ID MAGNETIC-FIELD; RIBBON; SENSITIVITY; ANISOTROPY AB A complete theoretical analysis is presented of the operation of a magnetoelastic amorphous metal low-frequency magnetic field sensor. This directional magnetometer is a hybrid device consisting of a piezoelectric plate, a field-annealed amorphous metal ribbon, and a viscous fluid, and it exhibits a low-frequency magnetic field detection level of 8.0 pT/square-root Hz at 1.0 Hz. The sensor may also be configured as a first- and second-order gradiometer. The device analysis focuses on the influence of the constituent materials on the magnetometer performance, identifying potential noise sources and optimal design parameters. This analysis may be applied to a variety of magnetoelastic amorphous metal sensors, e.g., stress, strain, and torque sensors, and is also useful in research concerning fundamental aspects of magnetoelasticity. Experimental data are presented demonstrating the performance of magnetometers constructed with amorphous metal ribbons exhibiting striped and closure domain structures. A comparison to existing magnetometer technologies is presented. RP MERMELSTEIN, MD (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 25 TC 21 Z9 21 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD JAN PY 1992 VL 28 IS 1 BP 36 EP 56 DI 10.1109/20.119814 PG 21 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HG220 UT WOS:A1992HG22000005 ER PT J AU HOW, H LIU, Y ZHANG, S VITTORIA, C CAROSELLA, C FOLEN, V AF HOW, H LIU, Y ZHANG, S VITTORIA, C CAROSELLA, C FOLEN, V TI EXPERIMENTAL WIDE-STOPBAND FILTERS UTILIZING ASYMMETRIC FERRITE JUNCTIONS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Note AB Filters incorporating asymmetric stripline Y-junction circulators have been fabricated and tested over the frequency range of 0.05 to 18 GHz. The passband frequency was near 2 GHz. The insertion loss was approximately 2 dB and the stopband extended from 4.5 to 18 GHz with transmission less-than-or-equal-to -30 dB. The filter includes ferrite discs in which high order modes have been eliminated as calculated in an earlier paper [2]. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HOW, H (reprint author), NORTHEASTERN UNIV,DEPT ELECT & COMP ENGN,BOSTON,MA 02115, USA. NR 4 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 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JAN PY 1992 VL 40 IS 1 BP 161 EP 164 DI 10.1109/22.108337 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA GZ387 UT WOS:A1992GZ38700021 ER PT J AU FREY, PR ROUSE, WB GARRIS, RD AF FREY, PR ROUSE, WB GARRIS, RD TI BIG GRAPHICS AND LITTLE SCREENS - DESIGNING GRAPHICAL DISPLAYS FOR MAINTENANCE TASKS SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article ID SYSTEMS AB The design of computer-based graphical displays for maintenance tasks is addressed. Traditional maintenance information includes large graphical drawings that are difficult to portray on the small screens of computer-based maintenance information systems. This research investigates the design of graphical displays using display abstraction and aggregation as design parameters. A display's aggregation level reflects the field of view of a display, such as component, assembly, or system level diagrams. A display's abstraction level reflects the representation contained in a diagram, such as a component's form, function, or purpose in an assembly. The results from two experiments with experienced maintenance personnel are presented. Usage of the display abstraction levels was found to vary with both the nature of the maintenance task and the experience level of the maintenance personnel. Usage of the display aggregation levels was found to change as task performance proceeded. Results of this investigation show promise for the application of these concepts to the development of computer-based maintenance information systems. C1 USN,CTR TRAINING SYST,ORLANDO,FL 32826. RP FREY, PR (reprint author), SEARCH TECHNOL INC,DESIGN SUPPORT SYST,ATLANTA,GA 30092, USA. NR 21 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD JAN-FEB PY 1992 VL 22 IS 1 BP 10 EP 20 DI 10.1109/21.141307 PG 11 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HX437 UT WOS:A1992HX43700002 ER PT B AU ROUSH, PE AF ROUSH, PE BE Clark, KE Clark, MB Campbell, DP TI THE MYERS-BRIGGS TYPE INDICATOR, SUBORDINATE FEEDBACK, AND PERCEPTIONS OF LEADERSHIP EFFECTIVENESS SO IMPACT OF LEADERSHIP LA English DT Proceedings Paper CT Conference on the Impact of Leadership CY JUL, 1991 CL COLORADO SPRINGS, CO SP CTR CREAT LEADERSHIP C1 USN,ANNAPOLIS,MD 21402. NR 0 TC 8 Z9 8 U1 2 U2 3 PU CENTER CREATIVE LEADERSHIP PI GREENSBORO PA PO BOX 26300, GREENSBORO, NC 27438-6300 BN 0-912879-95-5 PY 1992 BP 529 EP 542 PG 14 WC Psychology, Applied; Management SC Psychology; Business & Economics GA BA46J UT WOS:A1992BA46J00044 ER PT J AU ZANG, JX RUSTGI, ML AF ZANG, JX RUSTGI, ML TI ELECTRIC-FIELD DEPENDENCE OF THE ENERGY-LEVELS OF A WELL WITH AN ARBITRARY INTERNAL CONFIGURATION OF SQUARE POTENTIALS SO INFRARED PHYSICS LA English DT Article ID QUANTUM WELLS; SUPERLATTICES; LOCALIZATION; STATES; BAND AB Normalized analytical equations for eigenstates of a one-dimensional well containing an arbitrary internal configuration of square potentials subjected to a uniform electric field have been derived. The general formulation is used to calculate the electric field dependence of the energy levels of a deep well with five internal barriers. Typical results are shown in graphical forms as functions of the barrier height, barrier width, barrier effective mass, and the field strength. The formation of Stark ladders and surface states from the eigenstates of a single deep well in an electric field, the localization process of wavefunctions with changing barrier height, width, and field strength and their anticrossing behaviors are seen. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ZANG, JX (reprint author), SUNY BUFFALO,DEPT PHYS,BUFFALO,NY 14260, USA. NR 19 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 0020-0891 J9 INFRARED PHYS PY 1992 VL 33 IS 3 BP 175 EP 186 DI 10.1016/0020-0891(92)90011-H PG 12 WC Optics; Physics, Applied SC Optics; Physics GA HW199 UT WOS:A1992HW19900004 ER PT J AU CARRUTHERS, GR SEELEY, TD DYMOND, KF AF CARRUTHERS, GR SEELEY, TD DYMOND, KF TI ELECTRON-BOMBARDED CCD SENSORS FOR FAR-ULTRAVIOLET MEASUREMENTS OF THE UPPER-ATMOSPHERE SO INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Article AB We are currently developing two instruments based on electron-bombarded CCD (EBCCD) sensors with opaque alkali halide photocathodes, for far-ultraviolet measurements of the upper atmosphere from near-Earth orbit. The Global Imaging Monitor of the Ionosphere (GIMI) is based on two EBCCD Schmidt cameras with (1024)2-pixel CCDs, and images in the 75-104 and 131-160 nm wavelength ranges. The High Resolution Airglow and Aurora Spectrograph (HIRAAS) uses a windowless oblique magnetic focus EBCCD sensor with a 400 x 1200-pixel CCD. It covers the 54-170 nm wavelength range with 0.03 nm resolution. RP CARRUTHERS, GR (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0951-3248 J9 INST PHYS CONF SER JI Inst. Phys. Conf. Ser. PY 1992 IS 121 BP 1 EP 8 PG 8 WC Physics, Multidisciplinary SC Physics GA HV057 UT WOS:A1992HV05700001 ER PT J AU SEELEY, TD CONWAY, RR CARRUTHERS, GR AF SEELEY, TD CONWAY, RR CARRUTHERS, GR TI THE MIDDLE ATMOSPHERE HIGH-RESOLUTION SPECTROGRAPH INVESTIGATION SO INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Article AB The Middle Atmosphere High Resolution Spectrograph Investigation (MAHRSI) will obtain very high resolution spectra in the middle-UV wavelength range (198-310 nm with 0.01 nm resolution), in the mesosphere from near-Earth orbit. Its primary objective is to measure hydroxyl (OH) and nitric oxide (NO) in this region of the atmosphere. MAHRSI uses a Czerny-Turner spectrograph with an image-intensified CCD (ICCD) detector. The combination of a magnetically-focused image tube with Cs2Te photocathode and a large-format CCD provides high resolution, broad instantaneous spectral coverage, and a very wide dynamic range. RP SEELEY, TD (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 6 TC 0 Z9 0 U1 1 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0951-3248 J9 INST PHYS CONF SER JI Inst. Phys. Conf. Ser. PY 1992 IS 121 BP 41 EP 48 PG 8 WC Physics, Multidisciplinary SC Physics GA HV057 UT WOS:A1992HV05700006 ER PT J AU NORDQUIST, PER HENRY, RL BLAKEMORE, JS GORMAN, RJ SABAN, SB AF NORDQUIST, PER HENRY, RL BLAKEMORE, JS GORMAN, RJ SABAN, SB TI DEFECTS IN VERTICAL ZONE MELT (VZM) GAAS SO INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Article ID SEMI-INSULATING GAAS; CRYSTALS AB VZM growth of GaAs yields semi-insulating (SI) material with a low etch pit density (EPD ca. 2-4 x 10(-3)). We have used the NaOH-KOH eutectic mixture and the Abrahams-Buiocchi (AB) etch to explore the relationship between defects in GaAs (including precipitates) and crystal growth variables. The correlation of cooling regimes and arsenic overpressure during growth with the nature and distribution of etch-revealed defects and with electrical properties is discussed. C1 WESTERN WASHINGTON STATE UNIV, BELLINGHAM, WA 98225 USA. RP NORDQUIST, PER (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0951-3248 J9 INST PHYS CONF SER JI Inst. Phys. Conf. Ser. PY 1992 IS 120 BP 61 EP 66 PG 6 WC Physics, Multidisciplinary SC Physics GA HT793 UT WOS:A1992HT79300011 ER PT J AU GASKILL, DK BOTTKA, N STAUF, G BERRY, AK AF GASKILL, DK BOTTKA, N STAUF, G BERRY, AK TI SEMIINSULATING INP CHARACTERIZED BY PHOTOREFLECTANCE SO INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Article ID MODULATION SPECTROSCOPY AB Photoreflectance (PR) has been employed to characterize semi-insulating InP substrates from various vendors. The PR spectra taken at 82 K near the band gap were found to be explainable by the exciton ionization model. The spectra were used to estimate the surface electric field and the surface Fermi level of the substrates at room temperature. The phase of the PR line shape was found to depend on the bulk resistivity of the substrate. A simple physical model is used to explain this dependence, and a method for quantitatively determining resistivity was used to determine resistivity homogeneity throughout a boule and on a substrate. The PR line shape exhibited sensitivity to surface polishing damage and the damage depth was quantified. C1 ADV TECHNOL MAT, DANBURY, CT 06810 USA. GEORGE MASON UNIV, FAIRFAX, VA 22030 USA. RP GASKILL, DK (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0951-3248 J9 INST PHYS CONF SER JI Inst. Phys. Conf. Ser. PY 1992 IS 120 BP 259 EP 262 PG 4 WC Physics, Multidisciplinary SC Physics GA HT793 UT WOS:A1992HT79300051 ER PT J AU BADAKHSHAN, A DURBIN, C GLOSSER, R ALAVI, K SILLMON, RS THOMPSON, PE AF BADAKHSHAN, A DURBIN, C GLOSSER, R ALAVI, K SILLMON, RS THOMPSON, PE TI OPTICAL DETERMINATION OF ELECTRIC-FIELD AND CARRIER CONCENTRATION IN NANOMETRIC EPITAXIAL GAAS BY PHOTOREFLECTANCE SO INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Article ID MODULATION SPECTROSCOPY; ELECTROREFLECTANCE AB In this paper, we describe the application of photoreflectance (PR) to obtain the surface electric field and carrier concentration in moderately and heavily doped nanoscale epilayers of GaAs in a contactless manner. The technique exploits the PR line width of the E1 response (approximately 2.9eV). This is described by the empirical broadening parameter GAMMA-1, which we find increases linearly with the logarithm of the carrier concentration and the surface electric field beyond almost-equal-to 10(17) cm-3. The slope of the linear relation for n-Ga.As is nearly twice of that of p-GaAs. We explain the observed effect by the Schottky relation and Fermi level pinning and show that this effect is a function of the field intensity near the surface. We also show that the PR line shape at E1 is applicable in determining the field intensity and the carrier concentration of a nanometric GaAs layer in the vicinity of the surface. C1 VARO IMO INC, GARLAND, TX USA. EMCORE CORP, SOMERSET, NJ USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP BADAKHSHAN, A (reprint author), UNIV TEXAS, CTR APPL OPT & PHYS PROGRAMS, RICHARDSON, TX 75083 USA. NR 20 TC 0 Z9 0 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0951-3248 J9 INST PHYS CONF SER JI Inst. Phys. Conf. Ser. PY 1992 IS 120 BP 635 EP 638 PG 4 WC Physics, Multidisciplinary SC Physics GA HT793 UT WOS:A1992HT79300116 ER PT J AU MONTAGUE, WE ELLIS, JA AF MONTAGUE, WE ELLIS, JA TI UNITED-STATES MILITARY DEVELOPMENTS IN INSTRUCTIONAL-TECHNOLOGY SO INSTRUCTIONAL SCIENCE LA English DT Editorial Material RP MONTAGUE, WE (reprint author), USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92152, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0020-4277 J9 INSTR SCI JI Instr. Sci. PY 1992 VL 21 IS 4 BP 223 EP 224 PG 2 WC Education & Educational Research; Psychology, Educational SC Education & Educational Research; Psychology GA LA620 UT WOS:A1992LA62000001 ER PT J AU WULFECK, WH DICKIESON, JL APPLE, J VOGT, JL AF WULFECK, WH DICKIESON, JL APPLE, J VOGT, JL TI THE AUTOMATION OF CURRICULUM-DEVELOPMENT USING THE AUTHORING INSTRUCTIONAL-MATERIALS (AIM) SYSTEM SO INSTRUCTIONAL SCIENCE LA English DT Article AB The Authoring Instructional Materials (AIM) program is a set of software tools for curriculum design and maintenance for use in the Navy. Several Navy test sites are conducting cooperative development and testing of the AIM software. This paper describes the rationale for the AIM system, the development process and products, and some possibilities for further development. C1 ST NORBERT COLL,DE PERE,WI 54115. RP WULFECK, WH (reprint author), USN,CTR PERSONNEL RES & DEV,CODE 13,53335 RYNE RD,SAN DIEGO,CA 92152, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0020-4277 J9 INSTR SCI JI Instr. Sci. PY 1992 VL 21 IS 4 BP 255 EP 267 PG 13 WC Education & Educational Research; Psychology, Educational SC Education & Educational Research; Psychology GA LA620 UT WOS:A1992LA62000004 ER PT J AU WETZEL, CD AF WETZEL, CD TI GENERATIVE ASPECTS OF THE COMPUTER-BASED EDUCATIONAL SOFTWARE SYSTEM (CBESS) SO INSTRUCTIONAL SCIENCE LA English DT Article AB A system of computer-based instruction (CBI) authoring and delivery tools was developed in which generative CBI techniques were used to dynamically create instructional presentations from content databases during program execution. Three applications using these techniques are examined with regard to trade-offs between ease of development and limitations imposed by program specificity: 1) A semantic network was used to represent large bodies of terse facts to be memorized. The need for authors to create large numbers of question screens was avoided by a feature enabling questions and foils to be generated on-the-fly from database assertions as the student programs ran. 2) Technical vocabulary training was accomplished with a generative approach in which an array of student learning activities were automatically generated from a database minimally consisting of technical terms and their definitions. 3) A more difficult program allowed greater interface and lesson control flexibility for creating more sophisticated practice lessons in which new instances were dynamically inserted into templates for questions, anticipated answers and feedback. A common application theme emerging from field-testing the programs was their use in learning resource centers to address specific learning objectives from larger courses. RP WETZEL, CD (reprint author), USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92152, USA. NR 27 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0020-4277 J9 INSTR SCI JI Instr. Sci. PY 1992 VL 21 IS 4 BP 269 EP 293 PG 25 WC Education & Educational Research; Psychology, Educational SC Education & Educational Research; Psychology GA LA620 UT WOS:A1992LA62000005 ER PT J AU VANMATRE, N ELLIS, J MONTAGUE, W WULFECK, W AF VANMATRE, N ELLIS, J MONTAGUE, W WULFECK, W TI COMPUTER-MANAGED INSTRUCTION IN NAVAL TECHNICAL TRAINING SO INSTRUCTIONAL SCIENCE LA English DT Article AB Based on the success reported by the behaviorally oriented programmed instruction movement in the 1960s, the Navy in the late 1960s and early 1970s began to individualize and self-pace a number of their high student throughput apprentice training courses. To facilitate self-pacing the Navy set up a centralized computer-managed instruction (CMI) system to manage self-paced courses. This paper describes the evolution of that CMI system, reviews a number of studies done on the system over 10 years (many of which were published as internal technical reports with restricted distribution), describes the demise of the system, and discusses future directions of self-paced and individualized instruction. RP VANMATRE, N (reprint author), USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92152, USA. NR 30 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0020-4277 J9 INSTR SCI JI Instr. Sci. PY 1992 VL 21 IS 4 BP 295 EP 311 PG 17 WC Education & Educational Research; Psychology, Educational SC Education & Educational Research; Psychology GA LA620 UT WOS:A1992LA62000006 ER PT J AU ELLIS, JA KNIRK, FG TAYLOR, BE MCDONALD, BA AF ELLIS, JA KNIRK, FG TAYLOR, BE MCDONALD, BA TI THE COURSE-EVALUATION SYSTEM SO INSTRUCTIONAL SCIENCE LA English DT Article AB Improving military and industrial classroom training is extremely important because of the critical nature and high costs of this activity. This article describes the Course Evaluation System (CES) which is a diagnostic and prescriptive methodology for evaluating the quality of classroom training and suggesting remedial measures. The CES provides course managers, instructional developers and classroom instructors with the capability to pinpoint training problems and to make corrective revisions. The use of this system is intended to result in more efficient and effective training. The CES is based on the principles of systematic instructional development and on empirical work demonstrating effective instructional strategies. This methodology has been validated in several hundred applications. It consists of two major sections, the objective-test item evaluation and the instructional presentation evaluation. C1 UNIV SO CALIF,LOS ANGELES,CA 90089. RP ELLIS, JA (reprint author), USN,CTR PERSONNEL RES DEV,SAN DIEGO,CA 92152, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0020-4277 J9 INSTR SCI JI Instr. Sci. PY 1992 VL 21 IS 4 BP 313 EP 334 PG 22 WC Education & Educational Research; Psychology, Educational SC Education & Educational Research; Psychology GA LA620 UT WOS:A1992LA62000007 ER PT J AU NAKOS, G GLINOS, N AF NAKOS, G GLINOS, N TI COMPUTER ALGEBRA AND DESUSPENSIONS OF STUNTED REAL PROJECTIVE SPACES SO INTERNATIONAL JOURNAL OF COMPUTER MATHEMATICS LA English DT Article DE ALGORITHMS; FORMAL POWER SERIES; ALGEBRAIC TOPOLOGY; SYMBOLIC COMPUTATIONS C1 USN ACAD,DEPT COMP SCI,ANNAPOLIS,MD 21402. RP NAKOS, G (reprint author), USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0020-7160 J9 INT J COMPUT MATH JI Int. J. Comput. Math. PY 1992 VL 43 IS 1-2 BP 11 EP 20 DI 10.1080/00207169208804069 PG 10 WC Mathematics, Applied SC Mathematics GA JB138 UT WOS:A1992JB13800002 ER PT J AU GILLES, RP OWEN, G VANDENBRINK, R AF GILLES, RP OWEN, G VANDENBRINK, R TI GAMES WITH PERMISSION STRUCTURES - THE CONJUNCTIVE APPROACH SO INTERNATIONAL JOURNAL OF GAME THEORY LA English DT Article AB This paper is devoted to the game theoretic analysis of decision situations, in which the players have veto power over the actions undertaken by certain other players. We give a full characterization of the dividends in these games with a permission structure. We find that the collection of these games forms a subspace of the vector space of all games with side payments on a specified player set. Two applications of these results are provided. The first one deals with the projection of additive games on a permission structure. It is shown that the Shapley value of these projected games can be interpreted as an index that measures the power of the players in the permission structure. The second application applies the derived results on games, where the organization structure can be analysed separately from the production capacities of the participating players. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93940. TILBURG UNIV,DEPT ECON,5000 LE TILBURG,NETHERLANDS. RP GILLES, RP (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT ECON,BLACKSBURG,VA 24061, USA. NR 12 TC 79 Z9 84 U1 0 U2 0 PU PHYSICA VERLAG GMBH PI HEIDELBERG PA TIERGARTENSTRASSE 17, W-6900 HEIDELBERG, GERMANY SN 0020-7276 J9 INT J GAME THEORY JI Int. J. Game Theory PY 1992 VL 20 IS 3 BP 277 EP 293 DI 10.1007/BF01253782 PG 17 WC Economics; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods; Statistics & Probability SC Business & Economics; Mathematics; Mathematical Methods In Social Sciences GA HM495 UT WOS:A1992HM49500008 ER PT J AU LEBRETON, M OWEN, G WEBER, S AF LEBRETON, M OWEN, G WEBER, S TI STRONGLY BALANCED COOPERATIVE GAMES SO INTERNATIONAL JOURNAL OF GAME THEORY LA English DT Article AB Kaneko/Wooders (1982) derived a list of necessary and sufficient conditions for a partitioning game to have a nonempty core regardless of the payoff functions of its effective coalitions. The main purpose of our paper is to provide a graph-theoretical characterization of this family of games whose associated hypergraphs we call strongly balanced: we show that the strong balancedness condition is equivalent to the normality of the hypergraph, which is a type of coloring property (Lovasz (1972)). We also study interesting economic examples of communication and assignment games and provide direct proofs that their associated hypergraphs are strongly balanced. C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. YORK UNIV,N YORK M3J 1P3,ONTARIO,CANADA. UNIV BONN,DEPT ECON,W-5300 BONN,GERMANY. RP LEBRETON, M (reprint author), GREQE,HOSPICE VIEILLE CHARITE,2 RUE CHARITE,F-13002 MARSEILLE,FRANCE. NR 15 TC 32 Z9 32 U1 0 U2 3 PU PHYSICA VERLAG GMBH PI HEIDELBERG PA TIERGARTENSTRASSE 17, W-6900 HEIDELBERG, GERMANY SN 0020-7276 J9 INT J GAME THEORY JI Int. J. Game Theory PY 1992 VL 20 IS 4 BP 419 EP 427 PG 9 WC Economics; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods; Statistics & Probability SC Business & Economics; Mathematics; Mathematical Methods In Social Sciences GA JG608 UT WOS:A1992JG60800008 ER PT J AU NEMES, JA EFTIS, J AF NEMES, JA EFTIS, J TI PRESSURE-SHEAR WAVES AND SPALL FRACTURE DESCRIBED BY A VISCOPLASTIC-DAMAGE CONSTITUTIVE MODEL SO INTERNATIONAL JOURNAL OF PLASTICITY LA English DT Article ID DYNAMIC FRACTURE; DUCTILE; METALS AB A model to predict material damage and spall fracture is applied to low-angle oblique plate-impact experiments. In this configuration, impact of parallel plates occurs along a direction inclined relative to the flyer velocity direction, resulting in normal and transverse deformations in both plates. The model uses the Perzyna viscoplastic constitutive theory that contains a scalar field variable description of the material damage, which is taken as the void volume fraction of the polycrystalline material. Incorporation of the damage parameter permits description of rate-dependent, compressible, inelastic deformation and ductile fracture. The model for microvoid growth is based upon a random distribution of microvoids idealized as spherical holes of arbitrary size, which, as an approximation, are assumed to remain spherical under the high mean stresses and moderate shear stresses that occur when the angle of inclination of the impact is small. A local spall fracture criterion based on critical microvoid volume is utilized. The constitutive equations are specialized for deformation associated with propagating plane waves of combined pressure and shear. Normal and transverse rear surface velocities are computed for oblique impact of 6061-T6 aluminum and compared to measured velocity histories. Numerical predictions are extended to conditions resulting in spallation under combined pressure-shear waves, using OFHC copper as the plate material. The void volume distribution resulting from the tensile mean stress in the target plate is computed to predict material damage. Computations are performed to illustrate the effect of damage on both the normal and transverse rear surface velocities. C1 GEORGE WASHINGTON UNIV,DEPT CIVIL MECH & ENVIRONM ENGN,WASHINGTON,DC 20052. RP NEMES, JA (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,MECH MAT BRANCH,WASHINGTON,DC 20375, USA. NR 26 TC 8 Z9 8 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0749-6419 J9 INT J PLASTICITY JI Int. J. Plast. PY 1992 VL 8 IS 2 BP 185 EP 207 DI 10.1016/0749-6419(92)90013-3 PG 23 WC Engineering, Mechanical; Materials Science, Multidisciplinary; Mechanics SC Engineering; Materials Science; Mechanics GA HR062 UT WOS:A1992HR06200004 ER PT J AU ACKERMANN, L ROSCH, N DUNLAP, BI PACCHIONI, G AF ACKERMANN, L ROSCH, N DUNLAP, BI PACCHIONI, G TI ELECTRONIC AND MAGNETIC-PROPERTIES OF ORGANOMETALLIC CLUSTERS - FROM THE MOLECULAR TO THE METALLIC STATE SO INTERNATIONAL JOURNAL OF QUANTUM CHEMISTRY LA English DT Article ID DENSITY-FUNCTIONAL CALCULATIONS; NEAR-THRESHOLD PHOTOIONIZATION; NICKEL CARBONYL CLUSTERS; STRUCTURAL CHARACTERIZATION; PHYSICAL-PROPERTIES; IONIZATION-POTENTIALS; MODEL CLUSTERS; ATOM CLUSTERS; SURFACES; SPECTROSCOPY AB We have performed a linear combination of Gaussian-type orbitals, LCGTO, local density functional, LDF, calculations on a series of low- and high-nuclearity carbonylated Ni clusters and on their naked counterparts. We have found that while the bare Ni clusters do exhibit several features in common with the bulk metal, the low-nuclearity carbonylated clusters do not show any metallic behavior. Signs of a developing metallic character are found for high-nuclearity Ni cluster carbonyls where it is possible to distinguish between "surface" atoms, which are directly interacting with the ligand sphere, and "bulk" atoms, which are only interacting with other metal atoms. Through the analysis of the magnetic properties of these systems it is possible to formulate a general model which rationalizes both the metallic behavior of the free Ni clusters and the nonmetallic behavior in certain carbonylated Ni clusters. This model is based on the perturbations induced by the ligands on the electronic structure of the metal atoms i n the cluster. C1 USN, RES LAB, THEORET CHEM SECT, WASHINGTON, DC 20375 USA. UNIV MILAN, DIPARTIMENTO CHIM INORGAN & METALLORGAN, CNR, VIA VENEZIAN 21, I-20133 MILAN, ITALY. TECH UNIV MUNICH, LEHRSTUHL THEORET CHEM, W-8046 GARCHING, GERMANY. RI Roesch, Notker/C-1182-2010; Pacchioni, Gianfranco/C-8529-2011; OI Pacchioni, Gianfranco/0000-0002-4749-0751; Dunlap, Brett/0000-0003-1356-6559 NR 57 TC 8 Z9 8 U1 0 U2 1 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0020-7608 EI 1097-461X J9 INT J QUANTUM CHEM JI Int. J. Quantum Chem. PY 1992 SU 26 BP 605 EP 619 PG 15 WC Chemistry, Physical; Mathematics, Interdisciplinary Applications; Physics, Atomic, Molecular & Chemical SC Chemistry; Mathematics; Physics GA JZ004 UT WOS:A1992JZ00400052 ER PT J AU LOONEY, RE AF LOONEY, RE TI FACTORS AFFECTING EMPLOYMENT IN THE ARABIAN GULF REGION, 1975-85 SO INTERNATIONAL JOURNAL OF SOCIAL ECONOMICS LA English DT Article DE EDUCATION; EMPLOYMENT; EXPATRIATES; GULF STATES; MANPOWER; OIL INDUSTRY; PRODUCTIVITY AB Assesses the main factors affecting employment in the Arab Gulf region. In particular: What are the main determinants of employment in the region? How do these determinants vary between national and foreign workforces? Have these determinants changed over time? The results, particularly for the 1980-85 period, suggest that labour market mismatches may be increasing in the Arab World. This is essentially the problem of too many PhDs and too few mechanics. The symptom of this would be relatively high levels of disguised unemployment among the highly educated, coupled with a shortage of artisans. The damage arising from these skill mismatches lies in the way the various economic sectors are likely to expand while faced by labour constraints. These findings suggest that reforms of both the educational system and the hiring practices of Government agencies will be critical to restoring increases in productivity and ultimately expanded rates of non-oil income. RP LOONEY, RE (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU MCB UNIV PRESS LTD PI BRADFORD PA 60/62 TOLLER LANE, BRADFORD, W YORKSHIRE, ENGLAND BD8 9BY SN 0306-8293 J9 INT J SOC ECON PY 1992 VL 19 IS 2 BP 43 EP 59 DI 10.1108/EUM0000000000481 PG 17 WC Economics SC Business & Economics GA HR144 UT WOS:A1992HR14400005 ER PT J AU STRIFORS, HC GAUNAURD, GC AF STRIFORS, HC GAUNAURD, GC TI MULTIPOLE CHARACTER OF THE LARGE-AMPLITUDE, LOW-FREQUENCY RESONANCES IN THE SONAR ECHOES OF SUBMERGED SPHERICAL-SHELLS SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article ID WAVES; SCATTERING; LAMB AB We analyze the large-amplitude resonance features, which are present at low frequencies in the backscattering cross-sections (BSCS) of air-filled, spherical, elastic shells submerged in water. By means of partial-wave expansions we demonstrate the multipole character of those features. For the materials and thicknesses investigated, it is confirmed that about half-a-dozen modes contribute to their formation. As the shell thickness decreases we note that: (i) fewer modes are seen to contribute to the BSCS. Ultimately, as the shell thickness approaches zero, only the monopole, n = 0, mode bas an effect, just as for an air-bubble in water. (ii) In the bubble case, the large amplitude becomes giant, the various peaks coalesce into one, and its spectral location shifts down to k1a approximately 10(-2). (iii) The narrow, low-amplitude set of overtones caused by the internal air remains present at all thicknesses, as the shell thickness decreases. Finally, we give a physical interpretation for these large features. They seem to be caused by a pseudo-Lamb wave denoted here by a0J, investigated earlier by Junger (1967), by means of Donnell's shell theory. This wave is slower than the generalized zeroth-order antisymmetric a0, Lamb wave for a shell. Its dispersion plot-which we display-exists only in the same narrow, low-frequency spectral band where the large echo features in question also occur. We investigate here its cause and effect by means of an exact, three-dimensional elasticity description of the shell motions, which was derived earlier by Ayres et al. (1987). We emphasize that what we have called, here and in the referenced paper, the a0-wave, is really a "generalized" antisymmetric zeroth-order Lamb wave for a shell, fluid-loaded on both sides by dissimilar fluids (and not for a plate in vacuum, as is often done). The a0J-wave is a companion type of generalized a0-wave for shells that emerges from the roots of the same characteristic equation, and which has no counterpart for flat plates. C1 USN,CTR SURFACE WARFARE,DEPT RES,SILVER SPRING,MD 20903. RP STRIFORS, HC (reprint author), NATL DEF RES ESTAB,FOA 2,S-17290 SUNDBYBERG,SWEDEN. NR 13 TC 18 Z9 19 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PY 1992 VL 29 IS 1 BP 121 EP 130 DI 10.1016/0020-7683(92)90100-8 PG 10 WC Mechanics SC Mechanics GA GN090 UT WOS:A1992GN09000009 ER PT J AU BROCK, LM MATIC, P DEGIORGI, VG AF BROCK, LM MATIC, P DEGIORGI, VG TI EARLY TRANSIENT-RESPONSE DURING CRACK-PROPAGATION IN A WEAKLY-COUPLED THERMOELASTIC SOLID SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article ID TEMPERATURE RISE; RUNNING CRACK; TIP AB A semi-infinite crack grows due to stress wave diffraction in a weakly-coupled thermoelastic solid. A rudimentary inelastic zone at the crack edge acts both as a heat flux site and as a crack-blunting mechanism. The transient analysis is first-step in the sense that constant crack/zone extension speeds are considered, and the material properties do not themselves vary with temperature. The a priori unknown heat flux in the zone, the temperature response at the zone edge, the crack opening displacement and the rate of energy production in the zone are studied in the period right after fracture/zone initiation. These expressions show that the applied (incident wave) stress should exceed the value necessary for zone formation predicted by a non-thermal analysis. The zone edge temperature increases rapidly at first, but then begins to level off in the same range of values noted for steady-state analyses at the time limit of the model's validity. The temperature rise varies inversely with zone growth rate, while the crack opening and energy production rate vary directly. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BROCK, LM (reprint author), UNIV KENTUCKY,LEXINGTON,KY 40506, USA. NR 22 TC 7 Z9 7 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PY 1992 VL 29 IS 8 BP 973 EP 989 DI 10.1016/0020-7683(92)90069-6 PG 17 WC Mechanics SC Mechanics GA HB691 UT WOS:A1992HB69100003 ER PT J AU HUANG, NN TAUCHERT, TR AF HUANG, NN TAUCHERT, TR TI THERMAL-STRESSES IN DOUBLY-CURVED CROSS-PLY LAMINATES SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article AB The elastic response of a doubly-curved cross-ply laminated panel subject to mechanical loading and temperature variation is investigated. The three-dimensional equilibrium equations, expressed in terms of displacements, are reduced to a system of coupled ordinary differential equations, which are then solved using the power series method. Numerical results are presented for a traction loaded saddle-shape shell and for a heated spherical panel. C1 USN, RES LAB, DEPT ENGN MECH, WASHINGTON, DC 20375 USA. RP NATL TAIWAN OCEAN UNIV, DEPT MARINE ENGN, CHILUNG, TAIWAN. NR 8 TC 44 Z9 50 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0020-7683 EI 1879-2146 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PY 1992 VL 29 IS 8 BP 991 EP 1000 DI 10.1016/0020-7683(92)90070-A PG 10 WC Mechanics SC Mechanics GA HB691 UT WOS:A1992HB69100004 ER PT J AU MADDOCKS, JH MALEKMADANI, R AF MADDOCKS, JH MALEKMADANI, R TI STEADY-STATE SHEAR-BANDS IN THERMO-PLASTICITY .1. VANISHING YIELD STRESS SO INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES LA English DT Article ID STABILITY; LOCALIZATION; STRAIN; INSTABILITY AB This paper concerns the construction and stability properties of steady-state solutions of a system of partial differential equations that model simple shearing of a slab of thermo-plastic material. The class of constitutive laws that give rise to a variational formulation of the steady-state problem is identified. and a phase-plane argument is used to construct time-independent solutions that may be interpreted as stead-state shear-bands. Our variational framework captures several commonly adopted constitutive laws. Techniques from bifurcation theory for variational problems are applied to classify stable and unstable solutions merely in terms of the shape of the solution branch in the distinguished bifurcation diagram that arises when average strain-rate is plotted against shearing force. There are two novel features to our approach. First, the two problems in which loading is imposed by either stress boundary conditions or velocity boundary conditions are treated by one analysis, and the differing stability properties of solutions are explained naturally. Second, the stability analysis is based upon a symmetric eigenvalue problem arising from the appropriate second variation. The link with dynamic behavior is made through a Lyapunov functional, and the linearized dynamics are not considered directly. Provided the proper existence theorems for the time-dependent problem can be proven or are assumed, our Lyapunov approach yields the appropriate nonlinear dynamic stability properties of steady-state solutions. In this paper we shall consider the case in which vanishing strain-rate implies zero stress, i.e. there is no residual or yield stress present in our model. but our analysis can be extended to encompass constitutive laws modelling nonzero yield stress. C1 UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLLEGE PK,MD 20742. USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. RP MADDOCKS, JH (reprint author), UNIV MARYLAND,DEPT MATH,COLLEGE PK,MD 20742, USA. NR 35 TC 9 Z9 9 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-7683 J9 INT J SOLIDS STRUCT JI Int. J. Solids Struct. PY 1992 VL 29 IS 16 BP 2039 EP 2061 DI 10.1016/0020-7683(92)90193-W PG 23 WC Mechanics SC Mechanics GA HV155 UT WOS:A1992HV15500003 ER PT J AU LAVERNIA, EJ AYERS, JD SRIVATSAN, TS AF LAVERNIA, EJ AYERS, JD SRIVATSAN, TS TI RAPID SOLIDIFICATION PROCESSING WITH SPECIFIC APPLICATION TO ALUMINUM-ALLOYS SO INTERNATIONAL MATERIALS REVIEWS LA English DT Review ID LIQUID DYNAMIC COMPACTION; FATIGUE CRACK-PROPAGATION; ULTRASONIC GAS ATOMIZATION; SPRAY DEPOSITION PROCESS; DENDRITE ARM SPACINGS; AL-CR ALLOYS; TRANSLATIONAL SYMMETRY; MATHEMATICAL-MODEL; TENSILE PROPERTIES; POWDER-METALLURGY AB The critical need for high strength, high performance, and cost effective materials has resulted in the use of novel processing techniques for the development of new aluminium alloys for structural applications. The highly attractive combinations of microstructure and mechanical properties achievable through rapid solidification technology (RST) have prompted the study and application of rapid solidification as a means of improving the behaviour of existing alloy systems and also developing novel alloying compositions. The rapid extraction of thermal energy associated with RST permits large deviations from equilibrium, as evidenced by the extension in solid solubility limits, sharp reductions in grain size, and a reduction in the size and number of segregated phases with concomitant development of non-equilibrium phases. In the present paper, the fundamental scientific principles underlying RST are discussed and particular emphasis is given to published studies of composition-processing-microstructure relationships in rapidly solidified aluminium alloys. The scope of the present work encompasses the development of consolidated RST aluminium alloys, including both dispersion and precipitation strengthened materials. The various processing techniques used to achieve rapid quenching are reviewed, with specific application to aluminium alloys. Microstructure-property relationships in powder processed, precipitation hardened, and dispersion strengthened aluminium alloys are critically examined with specific reference to matrix microstructural features, dislocation-microstructure interactions, and matrix slip characteristics. The deleterious effects of surface oxides on mechanical behaviour is also highlighted. C1 UNIV AKRON, DEPT MECH ENGN, AKRON, OH 44325 USA. USN, RES LAB, PHYS MET LAB, WASHINGTON, DC 20375 USA. RP UNIV CALIF IRVINE, DEPT MECH & AEROSP ENGN, MAT SCI & ENGN SECT, IRVINE, CA 92717 USA. NR 234 TC 232 Z9 248 U1 6 U2 54 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND SN 0950-6608 EI 1743-2804 J9 INT MATER REV JI Int. Mater. Rev. PY 1992 VL 37 IS 1 BP 1 EP 44 PG 44 WC Materials Science, Multidisciplinary SC Materials Science GA HJ378 UT WOS:A1992HJ37800001 ER PT J AU RUBIN, SH AF RUBIN, SH TI ARTIFICIAL-INTELLIGENCE FOR ENGINEERING, DESIGN, AND MANUFACTURING SO ISA TRANSACTIONS LA English DT Editorial Material RP RUBIN, SH (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, 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 0019-0578 J9 ISA T JI ISA Trans. PY 1992 VL 31 IS 2 BP 5 EP 8 DI 10.1016/0019-0578(92)90023-C PG 4 WC Automation & Control Systems; Engineering, Multidisciplinary; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA HQ437 UT WOS:A1992HQ43700002 ER PT J AU RUBIN, SH DILWORTH, DS AF RUBIN, SH DILWORTH, DS TI ON AUTOMATING GOAL-TO-TASK TRANSLATION IN A FUTURISTIC ROBOTIC FACTORY SO ISA TRANSACTIONS LA English DT Article AB A major technological impediment to increasing productivity in the manufacturing sector is the relative absence of automation at most stages of the product design process. One such stage involves the translation of non procedural goal files - describing the desired result of some aspect of the manufacturing process - into procedural task files. The task files detail the exact sequence of required steps as typified by an assembly operation. These steps can be effected by cooperating industrial robots. Therefore, it is important that the task files provide for coordination among the robots and minimize costly downtime. This paper advances a technique for automating the labor-intensive translation of goal-to-task files. The process entails the development and modification of an expert translator. Modification is part of a user-interactive on-line feedback loop or learning system. The system bas been implemented at NOSC in C and is supported by the Sun 3/50 platform. It is currently undergoing modification for application at CMU's futuristic robotic factory. RP RUBIN, SH (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, 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 0019-0578 J9 ISA T JI ISA Trans. PY 1992 VL 31 IS 2 BP 135 EP 150 DI 10.1016/0019-0578(92)90034-G PG 16 WC Automation & Control Systems; Engineering, Multidisciplinary; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA HQ437 UT WOS:A1992HQ43700013 ER PT J AU RUBIN, SH AF RUBIN, SH TI CASE-BASED LEARNING - A NEW PARADIGM FOR AUTOMATED KNOWLEDGE ACQUISITION SO ISA TRANSACTIONS LA English DT Article AB Case-Based Learning (CBL) is a new paradigm for solving problems by generalizing and transforming solutions of similar previously encountered ones. Cases serve as actual problem-solution instances in CBL. Here, cases differ from those in the Case-Based Reasoning (CBR) paradigm in that they are immutable. Expert(n) systems define a network of interacting domain-specific subsystems for bootstrapping CBL methods. The primitive subsystems are called next-generation expert systems. All subsystems constrain random generalization spaces. Generalizations can be augmented with a CBL method called Random Seeded Crystal Learning (RSCL). RSCL methods generate a population of similar hypotheses using a transformational paradigm. The cases serve to delimit this space while simultaneously refining the process for generating the hypotheses. RSCL, methods provide for the shifting of the knowledge engineer's focus from the design of rules to the design and bootstrapping of domain-specific languages for their capture. A prototype CBL system called LS bas been realized at NOSC LS efficiently induces novel rules that are open under deduction. Results indicate that more knowledge can be generated than is supplied. LS is implemented on a DAP-610 platform in approximately 10,000 lines of FORTRAN-Plus. Its utility especially as applied to intelligent manufacturing systems - is expected to mirror advances in parallel hardware. RP RUBIN, SH (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0019-0578 J9 ISA T JI ISA Trans. PY 1992 VL 31 IS 2 BP 181 EP 209 DI 10.1016/0019-0578(92)90038-K PG 29 WC Automation & Control Systems; Engineering, Multidisciplinary; Instruments & Instrumentation SC Automation & Control Systems; Engineering; Instruments & Instrumentation GA HQ437 UT WOS:A1992HQ43700017 ER PT J AU SANDERS, JT AF SANDERS, JT TI CURATORS OF THE PAST - THE PERIODICAL 'BYLOE', ITS HISTORY, EDITORS, PUBLISHERS - RUSSIAN - LURE,FM SO JAHRBUCHER FUR GESCHICHTE OSTEUROPAS LA English DT Book Review RP SANDERS, JT (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU FRANZ STEINER VERLAG GMBH PI STUTTGART 10 PA BIRKENWALDSTRABE 44, D-7000 STUTTGART 10, GERMANY SN 0021-4019 J9 JAHRB GESCH OSTEUR JI Jahrb. Gesch. Osteur. PY 1992 VL 40 IS 4 BP 578 EP 580 PG 3 WC History SC History GA KW683 UT WOS:A1992KW68300024 ER PT J AU SCHRAMM, W SMITH, RH CRAIG, PA KIDWELL, DA AF SCHRAMM, W SMITH, RH CRAIG, PA KIDWELL, DA TI DRUGS OF ABUSE IN SALIVA - A REVIEW SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Review ID FREE SERUM; PHENCYCLIDINE DISPOSITION; PHENYTOIN CONCENTRATIONS; GAS-CHROMATOGRAPHY; HEALTHY-VOLUNTEERS; MASS-SPECTROMETRY; COCAINE; PLASMA; DIAZEPAM; URINE C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP SCHRAMM, W (reprint author), BIOQUANT INC,1919 GREEN RD,ANN ARBOR,MI 48105, USA. NR 101 TC 122 Z9 126 U1 2 U2 16 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 JAN-FEB PY 1992 VL 16 IS 1 BP 1 EP 9 PG 9 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA HA113 UT WOS:A1992HA11300001 PM 1640691 ER PT J AU CASSADY, CJ WEIL, DA MCELVANY, SW AF CASSADY, CJ WEIL, DA MCELVANY, SW TI PRODUCTION AND FRAGMENTATION OF MOLYBDENUM OXIDE IONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID METAL CLUSTER IONS; COLLISION-INDUCED DISSOCIATION; MASS-SPECTROMETRY SIMS; GAS-PHASE REACTIONS; CYCLOTRON RESONANCE; OXYGEN; OXIDATION; HYDROCARBONS; CHEMISTRY; SURFACES AB The production and fragmentation of molybdenum oxide cluster ions MoxOy+/- have been studied by Fourier transform mass spectrometry. The cluster ions were generated by direct laser vaporization (DLV) and fast-atom bombardment (FAB) of molybdenum trioxide and molybdenum dioxide. The ionization method has a dramatic effect on ion formation with DLV producing primarily MoxOy+ with high oxygen-to-metal ratios, while FAB yields Mo(x+) and MoxOy+ with low oxygen-to-metal ratios. Direct emission appears to be an important mechanism in laser vaporization of molybdenum oxides, while the FAB results are consistent with ion formation by recombination reactions. For molybdenum dioxide, a comparison is made between DLV with pulsed CO2 and Nd:YAG lasers. The spectra obtained are similar; however, differences in (MoO3)n+, n = 1-3, production with the two lasers may be related to sample absorption at the CO2 wavelength of 10.6-mu-m. The low-energy collision-induced dissociation of MoxOy+ is dominated by loss of (MoO3)n. In addition, (MoO3)n- are the major anionic species produced by FAB and DLV. The prominence of the MoO3 unit in both ion production and fragmentation suggests that it may be significant in MoxOy+/- structures. C1 EXTRE FTMS,MADISON,WI 53711. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP CASSADY, CJ (reprint author), MIAMI UNIV,DEPT CHEM,OXFORD,OH 45056, USA. RI Cassady, Carolyn/C-7865-2009 NR 53 TC 26 Z9 26 U1 1 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 JAN 1 PY 1992 VL 96 IS 1 BP 691 EP 699 DI 10.1063/1.462454 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GY249 UT WOS:A1992GY24900074 ER PT J AU AU, WWL PAWLOSKI, DA AF AU, WWL PAWLOSKI, DA TI CYLINDER WALL THICKNESS DIFFERENCE DISCRIMINATION BY AN ECHOLOCATING ATLANTIC BOTTLE-NOSED-DOLPHIN SO JOURNAL OF COMPARATIVE PHYSIOLOGY A-SENSORY NEURAL AND BEHAVIORAL PHYSIOLOGY LA English DT Article DE THICKNESS DIFFERENCE DISCRIMINATION; ECHOLOCATION; BOTTLE-NOSED DOLPHIN AB The capability of an Atlantic bottlenose dolphin Tursiops truncatus to discriminate wall thickness differences of hollow cylinders by echolocation was studied. A standard cylinder of 6.35 mm wall thickness was compared with cylinders having wall thicknesses that differed from the standard by +/- 0.2, + 0.3, +/- 0.4, and +/- 0.8 mm. All cylinders had an O.D. of 37.85 mm, and a length of 12.7 cm. The dolphin was required to station in a hoop while the standard and comparison targets, separated by an angle of +/- 11-degrees from a center line, were simultaneously presented at a range of 8 m. The dolphin was required to echolocate and indicate the side of the standard target. Target location on each trial was randomized. Interpolation of the dolphin performance data indicated a wall thickness discrimination threshold (at the 75% correct response level) of -0.23 mm and + 0.27 mm. Backscatter measurements suggest that if the dolphin used time domain echo cues, it may be able to detect time differences between two echo highlights to within approximately +/- 500 ns. If frequency domain cues were used, the dolphin may be able to detect frequency shifts as small as 3 kHz in a broadband echo having a center frequency of approximately 110 kHz. Finally, if the dolphin used time-separation pitch (TSP) cues, it may be able to detect TSP differences of approximately 450 Hz. Discrimination tests with the thinner comparison targets were also conducted in the presence of broadband masking noise. For an echo energy-to-noise ratio of 19 dB the dolphin's performance was comparable to its noise-free performance. At an energy-to-noise ratio of 14 dB the dolphin was unable to achieve the 75% correct threshold with any of the comparison targets. C1 SAIC KAILUA,DIV SEACO,KAILUA,HI 96734. RP AU, WWL (reprint author), USN,CTR OCEAN SYST,KAILUA,HI 96734, USA. NR 18 TC 16 Z9 17 U1 1 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-7594 J9 J COMP PHYSIOL A JI J. Comp. Physiol. A-Sens. Neural Behav. Physiol. PD JAN PY 1992 VL 170 IS 1 BP 41 EP 47 PG 7 WC Behavioral Sciences; Neurosciences; Physiology; Zoology SC Behavioral Sciences; Neurosciences & Neurology; Physiology; Zoology GA HC895 UT WOS:A1992HC89500004 PM 1573570 ER PT J AU NEMES, JA SIMMONDS, KE AF NEMES, JA SIMMONDS, KE TI LOW-VELOCITY IMPACT RESPONSE OF FOAM-CORE SANDWICH COMPOSITES SO JOURNAL OF COMPOSITE MATERIALS LA English DT Article ID ELASTIC IMPACT; PLATES; PREDICTION; SPHERES; STRAIN AB The low-velocity impact response of foam-core sandwich composites with fiberglass/epoxy face sheets is treated by a combination of computational and experimental methods. Linear elastic constitutive models are used for the face sheets and epoxy bond layer in conjunction with a foam constitutive model that includes nonlinear hardening plasticity and coupling between volumetric and deviatoric deformation. A transient finite-element code, utilizing four-noded uniform strain quadrilaterals, is used to explicitly solve the equations for balance of mass and momentum. The resulting deformation histories are compared to the experimental results and show qualitative agreement. The computed transverse shear stresses are used to correlate ultrasonic measurement of damage in the core/epoxy interface. Comparison of the plate stiffness prior to and after impact illustrates the effect of damage on subsequent behavior. RP NEMES, JA (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,MECH MAT BRANCH,WASHINGTON,DC 20375, USA. NR 18 TC 63 Z9 64 U1 1 U2 6 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 0021-9983 J9 J COMPOS MATER JI J. Compos Mater. PY 1992 VL 26 IS 4 BP 500 EP 519 DI 10.1177/002199839202600403 PG 20 WC Materials Science, Composites SC Materials Science GA HJ024 UT WOS:A1992HJ02400003 ER PT J AU PROSSER, WH DORIGHI, J GORMAN, MR AF PROSSER, WH DORIGHI, J GORMAN, MR TI EXTENSIONAL AND FLEXURAL WAVES IN A THIN-WALLED GRAPHITE EPOXY TUBE SO JOURNAL OF COMPOSITE MATERIALS LA English DT Article DE ACOUSTIC EMISSION; COMPOSITE CYLINDER; PLATE WAVES; LAMINATED PLATE THEORY ID PROPAGATION; COMPOSITE; PLATES AB Simulated acoustic emission signals were induced in a thin-walled graphite/epoxy tube by means of lead breaks (Hsu-Neilsen source). The tube is of similar material and layup to be used by NASA in fabricating the struts of Space Station Freedom. The resulting waveforms were detected by broad band ultrasonic transducers and digitized. Measurements of the velocities of the extensional and flexural modes were made for propagation directions along the tube axis (0 degrees), around the tube circumference (90 degrees) and at an angle of 45 degrees. These velocities were found to be in agreement with classical plate theory. C1 USN,SCH POSTGRAD,MONTEREY,CA 93940. RP PROSSER, WH (reprint author), NASA,LANGLEY RES CTR,HAMPTON,VA 23665, USA. NR 16 TC 11 Z9 11 U1 0 U2 1 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 0021-9983 J9 J COMPOS MATER JI J. Compos Mater. PY 1992 VL 26 IS 14 BP 2016 EP 2027 DI 10.1177/002199839202601401 PG 12 WC Materials Science, Composites SC Materials Science GA JR989 UT WOS:A1992JR98900001 ER PT J AU RALSTON, ME CHOPLIN, NT HOLLENBACH, KA APPLEGATE, BJ HENN, TW AF RALSTON, ME CHOPLIN, NT HOLLENBACH, KA APPLEGATE, BJ HENN, TW TI GLAUCOMA SCREENING IN PRIMARY CARE - THE ROLE OF NONCONTACT TONOMETRY SO JOURNAL OF FAMILY PRACTICE LA English DT Article DE GLAUCOMA; TONOMETRY; OPHTHALMOLOGY ID OPEN-ANGLE GLAUCOMA; COLLABORATIVE GLAUCOMA AB Background. Guidelines for glaucoma screening by the primary care physician have not been firmly established. Despite its limitations as a screening test, intraocular pressure measurement, by tonometry remains the mainstay of glaucoma monitoring but is not widely used in the primary care setting. The purpose of this study was to compare the effectiveness of noncontact tonometry using the Pulsair instrument with that of conventional tonometry using the Goldmann applanation tonometer as a screening tool for glaucoma. Methods. Intraocular pressure was measured by noncontact and Goldmann applanation tonometry in both eyes of 50 volunteers who enrolled in a glaucoma screening program at a primary care clinic. Results. Noncontact tonometry correctly identified over 90% of the patients with intraocular pressures greater than 22 mm Hg. Conclusions. Noncontact tonometry is an easy, practical, and well-tolerated method of intraocular pressure measurement. When combined with direct ophthalmoscopy, noncontact tonometry can easily be used in routine primary care health examinations to detect glaucoma. C1 USN,MED CLIN,DEPT FAMILY PRACTICE,SEATTLE,WA. USN HOSP,DEPT OPHTHALMOL,SAN DIEGO,CA 92134. UNIV CALIF SAN DIEGO,DEPT COMMUNITY & FAMILY MED,LA JOLLA,CA 92093. RP RALSTON, ME (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 32 TC 2 Z9 3 U1 1 U2 4 PU APPLETON & LANGE PI E NORWALK PA 25 VAN ZANT ST, E NORWALK, CT 06855 SN 0094-3509 J9 J FAM PRACTICE JI J. Fam. Pract. PD JAN PY 1992 VL 34 IS 1 BP 73 EP 77 PG 5 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA GZ447 UT WOS:A1992GZ44700017 PM 1728657 ER PT J AU BARRACLOUGH, DR WILLIAMS, LD QUINN, JM AF BARRACLOUGH, DR WILLIAMS, LD QUINN, JM TI US UK CANDIDATES FOR THE DEFINITIVE GEOMAGNETIC REFERENCE FIELD MODEL DGRF-85 AND THE PREDICTIVE INTERNATIONAL GEOMAGNETIC REFERENCE FIELD MODEL IGRF-90 SO JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY LA English DT Article; Proceedings Paper CT 1991 ( 5TH ) REVISION OF THE INTERNATIONAL GEOMAGNETIC REFERENCE FIELD, AT THE 20TH GENERAL ASSEMBLY OF THE INTERNATIONAL UNION OF GEODESY AND GEOPHYSICS CY AUG, 1991 CL VIENNA, AUSTRIA SP INT UNION GEODESY & GEOPHYS ID INTENSITY; MAGSAT AB Candidate models for the Definitive Geomagnetic Reference Field 1985 (DGRF-85) and the 1990 International Geomagnetic Reference Field (IGRF-90) have been produced jointly by the British Geological Survey and the United States Naval oceanographic Office as part of their respective World Magnetic Modeling and Charting programs which are sponsored by the British Hydrographic Office and by the United States Defense Mapping Agency. These models are based on spherical harmonic expansions of the geomagnetic field to degree 10 (120 coefficients) for the main field and degree 8 (80 coefficients) for the secular variation. They are presented here along with a discussion of the data and modeling techniques that were used to produce them. C1 USN,OCEANOG OFF,BAY ST LOUIS,MS. RP BARRACLOUGH, DR (reprint author), BRITISH GEOL SURVEY,EDINBURGH,SCOTLAND. NR 10 TC 8 Z9 8 U1 0 U2 0 PU TERRA SCIENTIFIC PUBL CO PI TOKYO PA 2003 SANSEI JIYUGAOKA HAIMU, 5-27-19 OKUSAWA, SETAGAYA-KU, TOKYO 158, JAPAN SN 0022-1392 J9 J GEOMAGN GEOELECTR JI J. Geomagn. Geoelectr. PY 1992 VL 44 IS 9 BP 719 EP 734 PG 16 WC Geosciences, Multidisciplinary SC Geology GA KD182 UT WOS:A1992KD18200004 ER PT J AU QUINN, JM SHIEL, DL FABER, S CONRAD, JA AF QUINN, JM SHIEL, DL FABER, S CONRAD, JA TI A COMPARATIVE-ANALYSIS AND EVALUATION OF THE DGRF-85 AND IGRF-90 CANDIDATE MODELS SO JOURNAL OF GEOMAGNETISM AND GEOELECTRICITY LA English DT Article; Proceedings Paper CT 1991 ( 5TH ) REVISION OF THE INTERNATIONAL GEOMAGNETIC REFERENCE FIELD, AT THE 20TH GENERAL ASSEMBLY OF THE INTERNATIONAL UNION OF GEODESY AND GEOPHYSICS CY AUG, 1991 CL VIENNA, AUSTRIA SP INT UNION GEODESY & GEOPHYS AB Candidate models for the Definitive Geomagnetic Reference Field (DGRF) main field model at the 1985.0 epoch, as well as candidate models for the international Geomagnetic Reference Field (IGRF) main field model at the 1990.0 epoch along with the corresponding secular variation models at the 1992.5 epoch were evaluated against each other, and against data observations from both Project MAGNET aeromagnetic data and recently obtained Polar Orbiting Geomagnetic Survey (POGS) satellite data. Models for the 1985.0 epoch show some regional differences in model by model comparisons but, in general, are quite similar. All models agree well with the observed Project MAGNET data, which in this study involved 29,535 globally distributed observations collected between 1985.0 and 1989.9. Models for the 1990.0 epoch showed greater differences that were still regional rather than global in nature. The same was true for the corresponding 1992.5 secular variation models. The main field and secular variation models, in addition to direct comparisons against each other, were also compared against POGS total intensity data at the epoch 1991.1386. The US/UK models have problems in the south central Pacific, while the IZMIRAN models have problems in the south Atlantic. Recommendations based on the results of the model evaluations are summarized in Table 4. RP QUINN, JM (reprint author), USN,OCEANOG OFF,DIV GEOPOTENTIAL,BAY ST LOUIS,MS 39522, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU TERRA SCIENTIFIC PUBL CO PI TOKYO PA 2003 SANSEI JIYUGAOKA HAIMU, 5-27-19 OKUSAWA, SETAGAYA-KU, TOKYO 158, JAPAN SN 0022-1392 J9 J GEOMAGN GEOELECTR JI J. Geomagn. Geoelectr. PY 1992 VL 44 IS 9 BP 769 EP 792 PG 24 WC Geosciences, Multidisciplinary SC Geology GA KD182 UT WOS:A1992KD18200007 ER PT J AU HUBA, JD BERNHARDT, PA LYON, JG AF HUBA, JD BERNHARDT, PA LYON, JG TI PRELIMINARY-STUDY OF THE CRRES MAGNETOSPHERIC BARIUM RELEASES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; EXPANDING PLASMA CLOUDS; LARGE-LARMOR-RADIUS; LIMIT; MODES AB Preliminary theoretical and computational analyses of the Combined Release and Radiation Effects Satellite (CRRES) magnetospheric barium releases are presented. The focus of the studies is on the evolution of the diamagnetic cavity which is formed by the barium ions as they expand outward, and on the structuring of the density and magnetic field during the expansion phase of the releases. Two sets of simulation studies are discussed. The first set is based upon a two-dimensional ideal MHD code and provides estimates of the time and length scales associated with the formation and collapse of the diamagnetic cavity. The second set uses a nonideal MHD code; specifically, the Hall term is included. This additional term is critical to the dynamics of sub-Alfvenic plasma expansions, such as the CRRES barium releases, because it leads to instability of the expanding plasma. We performed detailed simulations of the G4 and G10 releases. In both cases the expanding plasma rapidly structured: the G4 release structured at time t less than or similar to 3 s and developed scale sizes approximately 1-2 km, while the G10 release structured at time t less than or similar to 22 s and developed scale sizes approximately 10-15 km. We also find that the diamagnetic cavity size is reduced from those obtained from the ideal MHD results because of the structure. On the other hand, the structuring allows the formation of plasma blobs which appear to free stream across the magnetic field; thus, the barium plasma can propagate to larger distances transverse to the magnetic field than the case where no structuring occurs. Finally, we also discovered a new normal mode of the system which may be excited at the leading edge of the expanding barium plasma. This mode is a magnetic drift wave which propagates azimuthally around the barium cloud in the frequency range OMEGA(i) << omega << OMEGA(e). C1 UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 16 TC 53 Z9 54 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JAN 1 PY 1992 VL 97 IS A1 BP 11 EP 24 DI 10.1029/91JA02144 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GY568 UT WOS:A1992GY56800002 ER PT J AU HUBA, JD AF HUBA, JD TI THEORY OF SMALL-SCALE DENSITY AND ELECTRIC-FIELD FLUCTUATIONS IN THE NIGHTSIDE VENUS IONOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID HYBRID-DRIFT INSTABILITY; MAGNETIC-FIELD; PLASMA; HOLES; BETA; WAKE AB Recently, it has been reported that small-scale (lambda approximately 0.1-2 km) density irregularities occur during 100-Hz electric field bursts in the nightside ionosphere of Venus. The correlation of field and plasma fluctuations suggests that a local plasma instability may be responsible for the turbulence. In this paper we provide a detailed analysis of the lower-hybrid-drift instability as a mechanism to generate the observed irregularities. We develop a fully electromagnetic theory that is relevant to the finite beta-plasma in Venus' ionosphere and include collisional effects (e.g., electron-ion, electron-neutral, and ion-neutral collisions). The key features of the analysis that favor this instability are (1) it is a flute mode and propagates orthogonal to the ambient magnetic field, (2) it is a relatively short wavelength mode and the Doppler-shifted frequency can be greater than or similar to 100 Hz, (3) it can produce both electric field and density fluctuations, as well as magnetic field fluctuations in a finite beta-plasma, and (4) it is most unstable in low-beta-plasmas (i.e., beta less than or similar to 1) so that it is likely to occur in the low-density, high-magnetic-field ionospheric holes. These features are consistent with observational results. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,CODE 4780IH,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 25 TC 19 Z9 19 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JAN 1 PY 1992 VL 97 IS A1 BP 43 EP 50 DI 10.1029/91JA02404 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GY568 UT WOS:A1992GY56800004 ER PT J AU STEWART, AIF ALEXANDER, MJ MEIER, RR PAXTON, LJ BOUGHER, SW FESEN, CG AF STEWART, AIF ALEXANDER, MJ MEIER, RR PAXTON, LJ BOUGHER, SW FESEN, CG TI ATOMIC OXYGEN IN THE MARTIAN THERMOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ELECTRON-IMPACT EXCITATION; ULTRAVIOLET SPECTROMETER EXPERIMENT; GENERAL-CIRCULATION MODEL; CROSS-SECTIONS; COUPLED DYNAMICS; OI 1304-A; DAYGLOW; MARS; ATMOSPHERE AB Modern models of thermospheric composition and temperature and of excitation and radiative transfer processes are used to simulate the O I 130-nm emission from Mars measured by the Mariner 9 ultraviolet spectrometer. We use the Mars thermospheric general circulation model calculations (MTGCM) of Bougher et al. (1988a) and the Monte Carlo partial frequency redistribution multiple scattering code of Meier and Lee (1982). We find that the decline in atomic oxygen through the daylight hours predicted by the MTGCM cannot be reconciled with the excess afternoon brightness seen in the data. Oxygen concentrations inferred from the data show a positive gradient through the day, in agreement with the original analysis by Strickland et al. (1973), although the absolute amounts are somewhat less because we use a larger photoelectron impact excitation and a somewhat larger solar flux in the 130-nm triplet. In addition, the data suggest that the oxygen abundance increases toward high southerly latitudes, in contrast with the MTGCM prediction of high values in the northern (winter) hemisphere. It appears that solar forcing alone cannot account for the observed characteristics of the Martian thermosphere and that wave and tidal effects may profoundly affect the structure, winds, and composition. C1 UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721. DARTMOUTH COLL,THAYER SCH ENGN,HANOVER,NH 03755. JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP STEWART, AIF (reprint author), UNIV COLORADO,ATMOSPHER & SPACE PHYS LAB,BOULDER,CO 80309, USA. RI Bougher, Stephen/C-1913-2013; Meier, Robert/G-4749-2014; Paxton, Larry/D-1934-2015 OI Bougher, Stephen/0000-0002-4178-2729; Meier, Robert/0000-0001-8497-7115; Paxton, Larry/0000-0002-2597-347X NR 30 TC 47 Z9 46 U1 1 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JAN 1 PY 1992 VL 97 IS A1 BP 91 EP 102 DI 10.1029/91JA02489 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GY568 UT WOS:A1992GY56800008 ER PT J AU MALONE, JL OLDFIELD, EC WAGNER, KF SIMMS, TE DALY, R OBRIAN, J BURKE, DS AF MALONE, JL OLDFIELD, EC WAGNER, KF SIMMS, TE DALY, R OBRIAN, J BURKE, DS TI ABNORMALITIES OF MORNING SERUM CORTISOL-LEVELS AND CIRCADIAN-RHYTHMS OF CD4+ LYMPHOCYTE COUNTS IN HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1-INFECTED ADULT PATIENTS SO JOURNAL OF INFECTIOUS DISEASES LA English DT Letter ID ENDOCRINE ABNORMALITIES; INFECTION; HIV; SUBSETS C1 USN HOSP, DEPT INTERNAL MED, SAN DIEGO, CA 92134 USA. NATL NAVAL MED CTR, DEPT INTERNAL MED, BETHESDA, MD 20814 USA. WALTER REED ARMY MED CTR, WASHINGTON, DC 20307 USA. RP MALONE, JL (reprint author), USN HOSP, DEPT CLIN INVEST, SAN DIEGO, CA 92134 USA. OI /0000-0002-5704-8094 NR 10 TC 13 Z9 14 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 JAN PY 1992 VL 165 IS 1 BP 185 EP 186 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA GW582 UT WOS:A1992GW58200036 PM 1345795 ER PT J AU BRADY, RF AF BRADY, RF TI VOLUME CHANGE IN THE POLYMERIZATION OF SPIROCYCLIC MONOMERS - CAUSES, EFFECTS, AND APPLICATIONS SO JOURNAL OF MACROMOLECULAR SCIENCE-REVIEWS IN MACROMOLECULAR CHEMISTRY AND PHYSICS LA English DT Review ID RING-OPENING POLYMERIZATION; GLASS-TRANSITION TEMPERATURE; AMINE EPOXY SYSTEM; SPIRO ORTHO-ESTERS; CONTROLLED SHRINKAGE POLYMERS; CONTROLLED REACTION-KINETICS; CONTROLLED MATRIX SHRINKAGE; DIAMINE NETWORK POLYMERS; BICYCLIC ORTHO ESTERS; INTERNAL-STRESS RP BRADY, RF (reprint author), USN,RES LAB,DIV CHEM,MAT CHEM BRANCH,WASHINGTON,DC 20375, USA. NR 161 TC 38 Z9 38 U1 0 U2 1 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0736-6574 J9 J MACROMOL SCI R M C JI J. Macromol. Sci.-Rev. Macromol. Chem. Phys. PY 1992 VL C32 IS 2 BP 135 EP 181 PG 47 WC Polymer Science SC Polymer Science GA HX811 UT WOS:A1992HX81100001 ER PT J AU BRIZZOLARA, RA COLTON, RJ AF BRIZZOLARA, RA COLTON, RJ TI THE MAGNETOSTRICTION OF COFENIMO METALLIC GLASSES MEASURED WITH A TUNNELING TRANSDUCER SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID ALLOYS AB The longitudinal magnetostriction as a function of the Co/Fe content of the metallic glass series Co(72-x)Fe(x)Ni3 Mo1Si12B12, for 0 less-than-or-equal-to x less-than-or-equal-to 10, is reported. The measurement is performed using a novel technique, based on electron tunneling, which provides a highly sensitive, noncontact, quasi-dc and direct measurement of magnetostrictive strains. The minimum value of the longitudinal magnetostriction measured is (-1.65 +/- 0.24) ppm for 0% Fe, and the maximum (in this composition range) is (2.51 +/- 0.15) ppm for 10% Fe, with a zero-magnetostriction composition of 5.25% Fe. These data are compared to those previously reported for a similar metallic glass series, but with higher Mo content. Increasing the Mo content in these glasses is shown to decrease the Fe content at the zero-magnetostriction composition point. C1 USN,RES LAB,DIV CHEM,CODE 6177,WASHINGTON,DC 20375. NR 15 TC 3 Z9 4 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 JAN PY 1992 VL 103 IS 1-2 BP 111 EP 116 DI 10.1016/0304-8853(92)90243-H PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA GZ481 UT WOS:A1992GZ48100018 ER PT J AU RHODES, JC JENSEN, HE NILIUS, AM CHITAMBAR, CR FARMER, SG WASHBURN, RG STEELE, PE AMLUNG, TW AF RHODES, JC JENSEN, HE NILIUS, AM CHITAMBAR, CR FARMER, SG WASHBURN, RG STEELE, PE AMLUNG, TW TI ASPERGILLUS AND ASPERGILLOSIS SO JOURNAL OF MEDICAL AND VETERINARY MYCOLOGY LA English DT Article; Proceedings Paper CT 11TH CONGRESS OF THE INTERNATIONAL SOC FOR HUMAN AND ANIMAL MYCOLOGY CY JUN 24-28, 1991 CL MONTREAL, CANADA SP INT SOC HUMAN & ANIM MYCOL ID ELASTASE PRODUCTION; FUMIGATUS CONIDIA; COMPLEMENT; HYPHAE; ACTIVATION; CATTLE; IRON; PROTEINASE; INVITRO; DEFENSE C1 MED COLL WISCONSIN,WAUWATOSA,WI. ROYAL VET & AGR UNIV,DK-1870 COPENHAGEN,DENMARK. USN,RES INST,GREAT LAKES,IL 60088. WAKE FOREST UNIV,MED CTR,WINSTON SALEM,NC 27109. RP RHODES, JC (reprint author), UNIV CINCINNATI,CINCINNATI,OH 45267, USA. NR 42 TC 10 Z9 11 U1 2 U2 2 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0268-1218 J9 J MED VET MYCOL JI J. Med. Vet. Mycol. PY 1992 VL 30 SU 1 BP 51 EP 57 PG 7 WC Mycology SC Mycology GA KC681 UT WOS:A1992KC68100007 PM 1474459 ER PT J AU SANGHERA, JS HARBISON, BB AGGARWAL, ID AF SANGHERA, JS HARBISON, BB AGGARWAL, ID TI CHALLENGES IN OBTAINING LOW-LOSS FLUORIDE GLASS-FIBERS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL SYMP ON HALIDE GLASSES CY MAR 17-21, 1991 CL LORNE, AUSTRALIA SP MONASH UNIV, CTR ADV MAT TECHNOL, TELECOMMUN AUSTR RES LABS MONTECH ID OPTICAL FIBERS; FLUOROZIRCONATE; SCATTERING AB The contribution from the different mechanisms to the total loss at 2.55-mu-m is reviewed. The observations suggest that extrinsic scattering induced by the different fiberizing techniques is the biggest limitation to achieving low loss in fluoride fibers. Extrinsic scattering is mainly due to microcrystals which grow on heterogeneities which can be subsequently eliminated and bubbles which are frequently present in all fiberizing techniques. A new fiberizing technique called the core injection technique (CIT) is discussed which potentially eliminates the presence of bubbles. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. RP SANGHERA, JS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 4 Z9 4 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 JAN PY 1992 VL 140 IS 1-3 BP 146 EP 149 DI 10.1016/S0022-3093(05)80758-6 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA HD807 UT WOS:A1992HD80700029 ER PT J AU FREITAS, JA SANGHERA, JS STROM, U PUREZA, PC AGGARWAL, ID AF FREITAS, JA SANGHERA, JS STROM, U PUREZA, PC AGGARWAL, ID TI RAMAN-SCATTERING STUDIES OF MICROCRYSTALLINE INCLUSIONS IN FLUORIDE GLASSES AND FIBERS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL SYMP ON HALIDE GLASSES CY MAR 17-21, 1991 CL LORNE, AUSTRALIA SP MONASH UNIV, CTR ADV MAT TECHNOL, TELECOMMUN AUSTR RES LABS MONTECH ID SPECTRA AB Micro-Raman spectroscopy has been successfully used to identify crystalline inclusions in bulk fluoride glasses and optical fibers. The crystalline phases NaF.(2ZrF4.BaF2) and NaF.(HfF4.ZrF4.BaF2) were identified in ZBLAN and HZBLAN glasses, respectively. Also, LaF3 micro-crystallite inclusions were unambiguously identified in the core of a particular optical fiber. C1 GEOCENTER,FT WASHINGTON,MD 20744. USN,RES LAB,WASHINGTON,DC 20375. RP FREITAS, JA (reprint author), SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785, USA. NR 14 TC 7 Z9 7 U1 0 U2 6 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 JAN PY 1992 VL 140 IS 1-3 BP 166 EP 171 DI 10.1016/S0022-3093(05)80762-8 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA HD807 UT WOS:A1992HD80700033 ER PT J AU DODD, N OLTMANSHAY, J THORNTON, EB AF DODD, N OLTMANSHAY, J THORNTON, EB TI SHEAR INSTABILITIES IN THE LONGSHORE-CURRENT - A COMPARISON OF OBSERVATION AND THEORY SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Article ID EDGE WAVE OBSERVATIONS; 2 CALIFORNIA BEACHES AB Low-frequency (< 0.01 Hz) oscillations in the surf zone longshore current with wavelengths too small (< 300 m) to be surface gravity waves were observed during the 1986 SUPERDUCK experiment at Duck, North Carolina. The observations suggest that these oscillations are dynamically linked to the mean longshore current in the surf zone, leading Bowen and Holman to propose that the observed oscillations are manifestations of a shear instability in the longshore current. In this paper, field data from both the SUPERDUCK experiment (a barred beach) and the 1980 NSTS experiment, at Leadbetter Beach, Santa Barbara, California (a plane beach), are used to compare quantitatively the model of Bowen and Holman (which is extended to include the effects of dissipation due to bottom friction) with observation. Observed frequency-cyclic wavenumber (f-K) spectra (constructed from along shore arrays of velocity measurements made in about 1.5-2 m of water in the trough of the bar at SUPERDUCK, and in about 1 m at NSTS) are compared with theoretical predictions. Quantitative agreement is found between observation and theory at SUPERDUCK, where these motions dominate the observed f-K spectra, theoretical growth rates of the temporal instability tend to be large, and the mean longshore current varied between 0.35 and 1.0 m s-1. This comparison supports the shear instability hypothesis. Results from Leadbetter Beach (where the mean longshore current was always less than 0.5 m s-1) are less conclusive because of scatter in the observed f-K spectra; however, observation and theory agree on the f-K quadrant and on the general area within it. Finally, stability properties at the two beaches are compared. It is shown that longshore current profiles over a plane and a barred beach may give rise to different stability properties, suggesting that shear instabilities may be a more common feature on barred beaches. C1 USN,RES CTR,DEPT OCEANOG,MONTEREY,CA 93940. NR 19 TC 47 Z9 47 U1 0 U2 6 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-3670 J9 J PHYS OCEANOGR JI J. Phys. Oceanogr. PD JAN PY 1992 VL 22 IS 1 BP 62 EP 82 DI 10.1175/1520-0485(1992)022<0062:SIITLC>2.0.CO;2 PG 21 WC Oceanography SC Oceanography GA HD574 UT WOS:A1992HD57400005 ER PT J AU JOYCE, JA SMUDZ, R AF JOYCE, JA SMUDZ, R TI EVALUATION OF ELASTIC STRESS INTENSITY USING J-INTEGRAL SPECIMEN GEOMETRIES SO JOURNAL OF TESTING AND EVALUATION LA English DT Article DE FRACTURE; STRESS INTENSITY FACTOR; DUCTILE FRACTURE; FRACTURE TOUGHNESS; ELASTIC FRACTURE; SIDE GROOVES; EFFECTIVE THICKNESS AB The development of a "Common Test Method" for fracture mechanics toughness evaluations requires changes in the test specimens used for evaluation of the elastic critical stress intensity factor K(Ic). The present method, ASTM E 399, does not allow the use of side grooves and load-line crack opening displacement measurements as is common and necessary for J-integral and CTOD elastic-plastic fracture methods like ASTM E 813, E 1152, and E 1290. This paper presents experimental data on two materials that demonstrate that the J-integral type specimen can be used to evaluate K(Ic) in an accurate fashion and that hence a true "Common Method" is possible. The basic conclusions are that if the secant offset slope is varied to correspond to 2% crack growth, the K(Q) values measured from specimens with a/W ratios between 0.55 and 0.7 are indistinguishable from standard results. Side grooves do not affect the results as long as an effective specimen thickness is used for the K(Q) evaluation, and the J-type load-line cutouts appear to have no effect on the measured K(Q) results. C1 USN,SAN DIEGO,CA 92122. USN ACAD,ANNAPOLIS,MD 21402. NR 6 TC 3 Z9 3 U1 0 U2 0 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0090-3973 J9 J TEST EVAL JI J. Test. Eval. PD JAN PY 1992 VL 20 IS 1 BP 1 EP 5 PG 5 WC Materials Science, Characterization & Testing SC Materials Science GA JY510 UT WOS:A1992JY51000001 ER PT J AU RUFFA, AA AF RUFFA, AA TI ACOUSTIC-WAVE PROPAGATION THROUGH PERIODIC BUBBLY LIQUIDS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID OSCILLATIONS AB A three-dimensional finite-element analysis is used to determine the acoustic behavior of plane waves propagating through bubbly liquids having periodic bubble distributions. The results obtained from the model include the effective phase speed and attenuation of the medium, the acoustic field in the region of each bubble, and the virtual mass for both the monopole and dipole modes of bubble oscillation. The results are in agreement with both experimental data and previous analytical results. RP RUFFA, AA (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON LAB,NEW LONDON,CT 06320, USA. NR 16 TC 26 Z9 26 U1 1 U2 6 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 JAN PY 1992 VL 91 IS 1 BP 1 EP 11 DI 10.1121/1.402755 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HE385 UT WOS:A1992HE38500001 ER PT J AU RUDGERS, AJ AF RUDGERS, AJ TI EQUIVALENT NETWORKS FOR REPRESENTING THE 2-DIMENSIONAL PROPAGATION OF DILATATIONAL AND SHEAR-WAVES IN INFINITE ELASTIC PLATES AND IN STRATIFIED ELASTIC MEDIA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB An elastic plate (lamina) of infinite lateral extent, in which there exists a plane-wave elastic field owing to propagating dilatational and shear waves, is represented by a four-port equivalent network. The equations describing this equivalent network are mathematically identical to those equations taken from the theory of linear elasticity that describe the mechanical behavior of a plate with arbitrary plane-wave excitation of its surfaces. The equivalent network comprises two coupled transmission lines, one line representing dilatational-wave propagation and the other shear-wave propagation within the plate. A pair of ports at each plate surface transmit the normal and the transverse stresses acting at the surfaces to the input and output ports of the two transmission lines. The surface ports are coupled to the transmission-line ports by an arrangement that includes both multiwinding ideal transformers and gyrators. Gyrators are required in the network that is the topological equivalent of an elastic plate in order to make the network equations identical to the equations resulting from the theory of linear elasticity. Consequently, the network demonstrates that mode conversion at the boundaries of an elastic plate (i.e., the conversion of dilatational-wave motion into shear-wave motion and vice versa) is a nonreciprocal phenomenon. By cascade interconnection of appropriate equivalent networks of the kind reported, a network model can be constructed that fully and exactly describes two-dimensional elastic-wave propagation in an arbitrarily stratified medium. RP RUDGERS, AJ (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 29 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JAN PY 1992 VL 91 IS 1 BP 28 EP 38 DI 10.1121/1.402771 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HE385 UT WOS:A1992HE38500003 ER PT J AU GARRETT, SL AF GARRETT, SL TI THERMOACOUSTIC REFRIGERATORS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Note ID ENGINES RP GARRETT, SL (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 11 TC 0 Z9 0 U1 0 U2 3 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 JAN PY 1992 VL 91 IS 1 BP 517 EP 518 DI 10.1121/1.402742 PG 2 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HE385 UT WOS:A1992HE38500053 ER PT J AU BUTLER, LG CORY, DG DOOLEY, KM MILLER, JB GARROWAY, AN AF BUTLER, LG CORY, DG DOOLEY, KM MILLER, JB GARROWAY, AN TI NMR IMAGING OF ANISOTROPIC SOLID-STATE CHEMICAL-REACTIONS USING MULTIPLE-PULSE LINE-NARROWING TECHNIQUES AND H-1 T1-WEIGHTING SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID SWOLLEN PMMA RODS; AMMONIA GAS; MOLECULAR-CRYSTALS; FICKIAN DIFFUSION; RUBBERY POLYMERS; CARBOXYLIC-ACIDS; SOLVENT INGRESS; RESOLUTION; IMAGES AB The reactions of substituted benzoic acid crystals and powders with ammonia gas have been monitored using solid-state H-1 NMR imaging techniques. The reactions are inherently (crystal) or by design (powder) spatially anisotropic: For a crystal of 4-bromobenzoic acid, the expected reaction anisotropy was not seen, either optically or with H-1 NMR imaging, most likely due to poor crystal quality or an unexpected crystal morphology. Nevertheless, some anisotropy in the reaction was observed and the extent of reaction was obtained from the NMR images. For a deep bed of powdered toluic acid, an anisotropic reaction profile is found. The reaction of the more exposed top layers of the bed is rapid whereas there is a delay in the reaction of the bottom layers associated with the rate of diffusion of ammonia into the bed. The apparent reaction rate constant, k = 5 (2) X 10(-4) mol-1 m3 s-1, and the effective diffusivity, D(e) = 1.0 (4) X 10(-5) m2 s-1, were obtained from a fit to a simultaneous diffusion with reaction model for a slab. This work is the first application of H-1 NMR imaging, using multiple-pulse line-narrowing techniques, for monitoring a chemical reaction. For this work, the special advantage of line narrowing is that the images are weighted not by the H-1 T2 but rather by the T1 relaxation time. Thus, for the materials studied herein, selection of an appropriate relaxation time in the NMR experiment enables observation of either the reaction product or the total sample. C1 LOUISIANA STATE UNIV,DEPT CHEM,BATON ROUGE,LA 70803. LOUISIANA STATE UNIV,DEPT CHEM ENGN,BATON ROUGE,LA 70803. RP BUTLER, LG (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. RI Butler, Leslie/D-1636-2016 OI Butler, Leslie/0000-0003-1547-608X NR 50 TC 27 Z9 27 U1 2 U2 4 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 JAN 1 PY 1992 VL 114 IS 1 BP 125 EP 135 DI 10.1021/ja00027a018 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA GY631 UT WOS:A1992GY63100018 ER PT J AU WYSOCKI, VH DING, JM JONES, JL CALLAHAN, JH KING, FL AF WYSOCKI, VH DING, JM JONES, JL CALLAHAN, JH KING, FL TI SURFACE-INDUCED DISSOCIATION IN TANDEM QUADRUPOLE MASS SPECTROMETERS - A COMPARISON OF 3 DESIGNS SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Article ID POLYATOMIC IONS; COLLISIONS AB Three different devices that can be used for surface-induced dissociation (SID) in tandem quadrupole instruments are compared here. The designs were compared by examining the fragmentation of several compounds including benzene, W(CO)6, and (CH3)4N+. These studies show that SID can be readily implemented on a variety of tandem quadrupole instruments and that the spectra obtained with the in-line and 90-degrees instruments are similar. Evidence is presented that confirms that high average internal energies and narrow distributions of internal energy are available by this technique. Efficiencies for fragmentation of odd-electron ions are on the order of those previously reported by others. The overall SID efficiency for even-electron ions is higher than that for odd-electron ions of similar structure. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP WYSOCKI, VH (reprint author), VIRGINIA COMMONWEALTH UNIV,DEPT CHEM,RICHMOND,VA 23284, USA. NR 16 TC 93 Z9 93 U1 0 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD JAN PY 1992 VL 3 IS 1 BP 27 EP 32 DI 10.1016/1044-0305(92)85015-C PG 6 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA GZ121 UT WOS:A1992GZ12100004 PM 24242834 ER PT J AU SHIFLER, DA MORAN, PJ KRUGER, J AF SHIFLER, DA MORAN, PJ KRUGER, J TI THE PASSIVITY OF 304-STAINLESS STEEL IN PROPYLENE CARBONATE SOLUTIONS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ELECTROLYTES; WATER AB The passivation behavior of 304 stainless steel in anhydrous propylene carbonate (PC) containing 0.5M LiAsF6 or 0.5M LiClO4 was studied. The air-formed film on 304SS is stable up to the oxidation potential of PC (PC(ox)). Scratch tests show that the bared 304SS surface repassivates in the anhydrous PC solutions of either electrolyte by chemisorption of PC molecules below PC(ox). In PC/0.5M LiAsF6 solutions, the 304SS is not passivated at potentials above PC(ox). In PC/0.5M LiClO4 solutions the 304SS is passive at potentials 400-500 mV above PC(ox). This is attributed to the formation of a thin metastable perchlorate salt film or an adsorbed layer of perchlorate anions. When the perchlorate anions oxidize, the passivation becomes unstable and pitting occurs. Small (3-8 volume percent) additions of PC/0.5M LiClO4 to PC/0.5M LiAsF6 solutions raises the passive range to the perchlorate oxidation potential. Small quantities of water, propylene glycol, and propylene oxide added to PC slightly improve the passive range of the 304 stainless steel. C1 USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. RP SHIFLER, DA (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,CORROS & ELECTROCHEM RES LAB,BALTIMORE,MD 21218, USA. NR 24 TC 18 Z9 18 U1 1 U2 2 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD JAN PY 1992 VL 139 IS 1 BP 54 EP 60 DI 10.1149/1.2069198 PG 7 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA GY556 UT WOS:A1992GY55600019 ER PT J AU SAMADDAR, SN AF SAMADDAR, SN TI EQUAL PATH-LENGTH DESIGN FOR A PHASED-ARRAY ANTENNA SYSTEM SO JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS LA English DT Article AB A procedure is presented for positioning the various elements of a phased array antenna system preserving the "equal path length" characteristic. This antenna system consists of one horn illuminating a planar array (which is space-fed), each element of which is connected through an amplifier to the corresponding element of a radiating planar array. The objective is to make the total path length from the horn to any element of the radiating array via the respective points just described the same for all such elements. This is a desirable feature for making the system broad-band. An example is given and a corresponding model having the equal path length characteristic is built. RP SAMADDAR, SN (reprint author), USN,RES LAB,DIV RADAR,RADAR ANAL BRANCH,WASHINGTON,DC 20375, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-0032 J9 J FRANKLIN I JI J. Frankl. Inst.-Eng. Appl. Math. PD JAN PY 1992 VL 329 IS 1 BP 37 EP 44 DI 10.1016/0016-0032(92)90094-W PG 8 WC Automation & Control Systems; Engineering, Multidisciplinary; Engineering, Electrical & Electronic; Mathematics, Interdisciplinary Applications SC Automation & Control Systems; Engineering; Mathematics GA GV343 UT WOS:A1992GV34300004 ER PT J AU MILLER, AR SRIVASTAVA, HM AF MILLER, AR SRIVASTAVA, HM TI REDUCTION FORMULAS FOR KAMPE-DE-FERIET FUNCTIONS ASSOCIATED WITH CERTAIN CLASSES OF INCOMPLETE LIPSCHITZ-HANKEL TYPE INTEGRALS OF CYLINDRICAL-FUNCTIONS SO JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS LA English DT Article AB Reduction formulas and integral representations for Kampe de Feriet functions F(q:1;0)p:2;1 which are associated with certain classes of incomplete integrals of Bessel or cylindrical functions (including, for example, incomplete Lipschitz-Hankel integrals) are obtained. In addition, more general series identities related to these Kampe de Feriet functions are derived and a new derivation of Lerch's theorem for the partial sums of the coefficients of a special case of Gauss's hypergeometric function is provided. C1 UNIV VICTORIA,DEPT MATH & STAT,VICTORIA V8W 3P4,BC,CANADA. RP MILLER, AR (reprint author), USN,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375, USA. RI Srivastava, Hari /N-9532-2013 OI Srivastava, Hari /0000-0002-9277-8092 NR 15 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-0032 J9 J FRANKLIN I JI J. Frankl. Inst.-Eng. Appl. Math. PD JAN PY 1992 VL 329 IS 1 BP 155 EP 170 DI 10.1016/0016-0032(92)90105-P PG 16 WC Automation & Control Systems; Engineering, Multidisciplinary; Engineering, Electrical & Electronic; Mathematics, Interdisciplinary Applications SC Automation & Control Systems; Engineering; Mathematics GA GV343 UT WOS:A1992GV34300015 ER PT J AU LIN, HB EVERSOLE, JD CAMPILLO, AJ AF LIN, HB EVERSOLE, JD CAMPILLO, AJ TI SPECTRAL PROPERTIES OF LASING MICRODROPLETS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID MORPHOLOGY-DEPENDENT RESONANCES; STIMULATED RAMAN-SCATTERING; ENHANCED ENERGY-TRANSFER; LASER-EMISSION; DIELECTRIC MICROSPHERES; OPTICAL CAVITIES; AEROSOL-PARTICLE; PHOTON LIFETIME; DROPLET; DISTORTION AB The spectral behavior of 15.3-mu-m-diameter Rhodamine 6G in water solution droplets was studied. Micro-droplet lasing is known to occur simultaneously at many discrete wavelengths, each corresponding to one of many possible spherical cavity resonances. We show that lasing takes place on several mode orders at once. Modes of a given order were found to form a bell-shaped spectral cluster of typically 4-6 resonance lines having consecutive principal mode numbers. Clusters of different mode orders appear somewhat displaced spectrally from one another, with lowest-order clusters shifted to the red. This multiplicity of lasing modes is accounted for by spatial hole-burning effects. The relative lasing intensities of the differing mode orders are explained by an output coupling theory that considers the gain enhancement that is due to cavity quantum electrodynamic effects. An upper limit of 10(8) for the Q of a nondegenerate cavity mode was estimated from the data. C1 POTOMAC PHOTON INC,LANHAM,MD 20706. RP LIN, HB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 86 Z9 88 U1 4 U2 16 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD JAN PY 1992 VL 9 IS 1 BP 43 EP 50 DI 10.1364/JOSAB.9.000043 PG 8 WC Optics SC Optics GA GY191 UT WOS:A1992GY19100006 ER PT J AU SCHINDEL, L DRIFTMYER, R AF SCHINDEL, L DRIFTMYER, R TI SURFACE COOLING BY TRANSPIRATION OF A FREEZING LIQUID SO JOURNAL OF THERMOPHYSICS AND HEAT TRANSFER LA English DT Note C1 USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20910 USA. NR 4 TC 1 Z9 2 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA SN 0887-8722 J9 J THERMOPHYS HEAT TR JI J. Thermophys. Heat Transf. PD JAN-MAR PY 1992 VL 6 IS 1 BP 158 EP 160 DI 10.2514/3.332 PG 3 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA HX492 UT WOS:A1992HX49200023 ER PT J AU BERMUDEZ, VM AF BERMUDEZ, VM TI INFRARED OPTICAL-PROPERTIES OF DIELECTRIC METAL LAYER STRUCTURES OF RELEVANCE TO REFLECTION ABSORPTION-SPECTROSCOPY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID EXTERNAL REFLECTION; IR ABSORPTION; SUPERLATTICES; CONSTANTS; SPECTRUM; SURFACE; WATER AB The reflection of mid-infrared (IR) radiation from a non-absorbing (dielectric) layer of varying thickness on a semiinfinite metallic substrate is modeled using the classical Fresnel relations. Reflectance, phase shift, and field intensity are calculated as functions of polarization and angle of incidence. An ultrathin layer of an IR-absorbing molecule is then included in the model and the magnitude of the reflection absorption band calculated. The results provide insight into the design of experiments in which a metal layer buried beneath the surface of a dielectric material is used to enhance sensitivity to adsorbates in external-reflection IR reflection absorption spectroscopy. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 59 Z9 59 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JAN-FEB PY 1992 VL 10 IS 1 BP 152 EP 157 DI 10.1116/1.578128 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GZ443 UT WOS:A1992GZ44300022 ER PT J AU BAILARD, JA DEVRIES, JW KIRBY, JT AF BAILARD, JA DEVRIES, JW KIRBY, JT TI CONSIDERATIONS IN USING BRAGG REFLECTION FOR STORM EROSION PROTECTION SO JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE LA English DT Article ID WATER-WAVES AB It has been suggested that Bragg reflection, the combined coherent wave reflection from a few low-lying shore-parallel bars, might be used to protect a beach against storm-wave attack. Numerical models are used to examine two issues relating to the feasibility of this concept: the degree of erosion protection provided by reflecting a portion of the incident wave energy, and the degree of wave reflection that can be generated by a bar field of varying geometry. The results show that a Bragg-reflection bar field must reflect about one-quarter of the incident wave energy to provide a significant measure of storm erosion protection. Bar fields with uniform spacing are capable of producing the required magnitude of wave reflection, but lack sufficient bandwidth. Bandwidth can be increased by staggering the spacings between bars, however, this produces a concurrent decrease in wave-reflection magnitude. Bragg-reflection bar fields appear capable of providing a limited measure of storm erosion protection along U.S. Gulf Coast and Atlantic Coast beaches, but their bandwidth may be too limited for use along Pacific Coast beaches. C1 USN,CIV ENGN LAB,PORT HUENEME,CA 93043. UNIV DELAWARE,NEWARK,DE 19716. RP BAILARD, JA (reprint author), JAMES BAILARD & ASSOC,1150 BAILARD AVE,CARPINTERIA,CA 93013, USA. NR 22 TC 20 Z9 21 U1 0 U2 0 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-950X J9 J WATERW PORT C-ASCE JI J. Waterw. Port Coast. Ocean Eng.-ASCE PD JAN-FEB PY 1992 VL 118 IS 1 BP 62 EP 74 DI 10.1061/(ASCE)0733-950X(1992)118:1(62) PG 13 WC Engineering, Civil; Engineering, Ocean; Water Resources SC Engineering; Water Resources GA GW546 UT WOS:A1992GW54600005 ER PT J AU MCCORMICK, ME SHEEHAN, WE AF MCCORMICK, ME SHEEHAN, WE TI POSITIVE DRIFT OF BACKWARD-BENT DUCT BARGE SO JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE LA English DT Article C1 JOHNS HOPKINS UNIV,CIVIL ENGN,BALTIMORE,MD 21218. RP MCCORMICK, ME (reprint author), USN ACAD,OCEAN ENGN,ANNAPOLIS,MD 21402, USA. NR 4 TC 14 Z9 14 U1 1 U2 1 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-950X J9 J WATERW PORT C-ASCE JI J. Waterw. Port Coast. Ocean Eng.-ASCE PD JAN-FEB PY 1992 VL 118 IS 1 BP 106 EP 111 DI 10.1061/(ASCE)0733-950X(1992)118:1(106) PG 6 WC Engineering, Civil; Engineering, Ocean; Water Resources SC Engineering; Water Resources GA GW546 UT WOS:A1992GW54600008 ER PT J AU BODNER, S KOSS, M AF BODNER, S KOSS, M TI P53 MUTATIONS IN EWINGS-SARCOMA SO LABORATORY INVESTIGATION LA English DT Meeting Abstract C1 USN,MED ONCOL BRANCH,NCI,BETHESDA,MD 20814. ARMED FORCES INST PATHOL,DIV PULM,WASHINGTON,DC 20306. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0023-6837 J9 LAB INVEST JI Lab. Invest. PD JAN PY 1992 VL 66 IS 1 BP P2 EP P2 PG 1 WC Medicine, Research & Experimental; Pathology SC Research & Experimental Medicine; Pathology GA HA276 UT WOS:A1992HA27600752 ER PT J AU BROOK, I JACKSON, WE AF BROOK, I JACKSON, WE TI CHANGES IN THE MICROBIAL-FLORA OF AIRLINE HEADSET DEVICES AFTER THEIR USE SO LARYNGOSCOPE LA English DT Article ID BACTERIAL-FLORA AB The bacterial flora of 20 headset devices were evaluated before and after they were worn for 1 hour. Bacteria were recovered from all headsets, and their number increased from a mean (+/- standard deviation) of 60 +/- 5 organisms per device to 650 +/- 51 organisms per device (P < .001). The predominant organisms recovered were Staphylococcus spp, Streptococcus spp, Propionibacterium spp, and Peptostreptococcus spp. This study demonstrates the presence of potential pathogens in headset devices, as well as the increase in the number of these pathogens after the headsets have been worn for 1 hour. C1 USN,MED RES INST,BETHESDA,MD 20814. NR 10 TC 2 Z9 2 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0023-852X J9 LARYNGOSCOPE JI Laryngoscope PD JAN PY 1992 VL 102 IS 1 BP 88 EP 89 PG 2 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA HA475 UT WOS:A1992HA47500017 PM 1731163 ER PT J AU GREFENSTETTE, JJ AF GREFENSTETTE, JJ TI LEARNING DECISION STRATEGIES WITH GENETIC ALGORITHMS SO LECTURE NOTES IN ARTIFICIAL INTELLIGENCE LA English DT Article AB Machine learning offers the possibility of designing intelligent systems that refine and improve their initial knowledge through their own experience. This article focuses on the problem of learning sequential decision rules for multi-agent environments. We describe the SAMUEL learning system that uses genetic algorithms and other competition based techniques to learn decision strategies for autonomous agents. One of the main themes in this research is that the learning system should be able to take advantage of existing knowledge where available. This article describes some of the mechanisms for expressing existing knowledge in SAMUEL, and explores some of the issues in selecting constraints for the learning system. RP GREFENSTETTE, JJ (reprint author), USN,RES LAB,NAVY CTR APPL RES ARTIFICIAL INTELLIGENCE,WASHINGTON,DC 20375, USA. NR 24 TC 2 Z9 2 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 J9 LECT NOTES ARTIF INT JI Lect. Notes Artif. Intell. PY 1992 VL 642 BP 35 EP 50 PG 16 WC Computer Science, Artificial Intelligence SC Computer Science GA KV220 UT WOS:A1992KV22000003 ER PT J AU GOVER, RE ABED, EH GOLDBERG, AJ AF GOVER, RE ABED, EH GOLDBERG, AJ TI STOCHASTIC STABILITY ANALYSIS OF NONLINEAR GATED RADAR RANGE TRACKERS SO LECTURE NOTES IN CONTROL AND INFORMATION SCIENCES LA English DT Article; Proceedings Paper CT WORKSHOP ON STOCHASTIC THEORY AND ADAPTIVE CONTROL CY SEP 26-28, 1991 CL UNIV KANSAS, LAWRENCE, KS SP NATL SCI FDN, UNIV KANSAS, KANSAS CTR EXCELLENCE COMP AIDED SYST ENGN HO UNIV KANSAS AB This study addresses a nonlinear system of differential equations with colored noise parameters which models the behavior of a gated radar range tracking system in the presence of two competing targets. Recently [1], the authors introduced nonlinear dynamic models for a class of gated radar range trackers with automatic gain control (AGC). The set-up of [1] is general in that the number and nature of the targets, as well as the weighting patterns of the electronic tracking system gates, are not prespecified. These models were employed to study track point stability in a multi-target environment. The ability of a gated range tracker to resolve closely spaced targets was also studied using these models. In this paper, the basic model developed in [1] is applied to the study of target resolution assuming randomly fluctuating targets. Here we consider the case in which two randomly fluctuating targets are present in the range gate, one fast and one slow (relative to the tracker bandwidth). We obtain a Markovian model by augmenting the state space to include the colored noise. Numerical computation of the evolution of the probability density is employed to study sensitivity to certain model parameters, especially noise correlation time, intensity of the random fluctuations, target separation and separation rate and the AGC bandwidth. These numerical results are used to motivate several challenging analytical problems for this nonlinear stochastic system, for which we present some preliminary results. C1 USN,RES LAB,DIV TACT ELECTR WARFARE,ADV TECH BRANCH,WASHINGTON,DC 20375. UNIV MARYLAND,SYST RES CTR,COLL PK,MD 20742. UNIV MARYLAND,DEPT ELECT ENGN,COLL PK,MD 20742. NR 6 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-8643 J9 LECT NOTES CONTR INF JI Lect. Notes Control Inf. Sci. PY 1992 VL 184 BP 225 EP 239 PG 15 WC Automation & Control Systems; Computer Science, Information Systems SC Automation & Control Systems; Computer Science GA LF418 UT WOS:A1992LF41800018 ER PT J AU RICHTER, RB WARDLAW, WP AF RICHTER, RB WARDLAW, WP TI THE SMALLEST MATRIX OF GIVEN PERIOD AND PRIMITIVE ROOTS OF UNITY SO LINEAR ALGEBRA AND ITS APPLICATIONS LA English DT Article AB A nonsingular matrix A has period n if A(n) = I but A(k) not-equal I for 0 < k < n. We investigate the number r(K)(n), which is the smallest r such that there is an r x r matrix, with entries in the field K, that has period n. We compute this number as a function of the common degree theta-K(j) of the irreducible factors of the cyclotomic polynomial c(j)(x). Thus, we are led to an investigation of roots of unity in order to better understand the function theta. C1 USN,DEPT MATH,ANNAPOLIS,MD 21402. RP RICHTER, RB (reprint author), CARLETON UNIV,DEPT MATH & STAT,OTTAWA K1S 5B6,ONTARIO,CANADA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0024-3795 J9 LINEAR ALGEBRA APPL JI Linear Alg. Appl. PD JAN 1 PY 1992 VL 160 BP 87 EP 97 DI 10.1016/0024-3795(92)90440-L PG 11 WC Mathematics, Applied; Mathematics SC Mathematics GA GU714 UT WOS:A1992GU71400004 ER PT J AU FLEMING, BE AF FLEMING, BE TI THOUGHTS AND THEIR DISCONTENTS + THE SCHLONDORFF FILM AND MUSIL NOVEL - 'TORLESS', BOOK TO FILM SO LITERATURE-FILM QUARTERLY LA English DT Article RP FLEMING, BE (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU SALISBURY STATE UNIV PI SALISBURY PA LITERATURE-FILM QUARTERLY BOX 960, SALISBURY, MD 21801 SN 0090-4260 J9 LIT-FILM QUART JI Lit.-Film Q. PY 1992 VL 20 IS 2 BP 109 EP 114 PG 6 WC Film, Radio, Television; Literature SC Film, Radio & Television; Literature GA JN656 UT WOS:A1992JN65600002 ER PT B AU VANVECHTEN, D WOOD, KS LOVELLETTE, MN ARNOLD, G AF VANVECHTEN, D WOOD, KS LOVELLETTE, MN ARNOLD, G BE Booth, NE Salmon, GL TI EXPECTED CONSEQUENCES OF MAGNETIC-FIELD BIAS ON QUASI-PARTICLE LOSS RATES IN X-RAY TUNNEL JUNCTION DETECTORS AND OTHER RESOLUTION DEGRADING EFFECTS SO LOW TEMPERATURE DETECTORS FOR NEUTRINOS AND DARK MATTER IV LA English DT Proceedings Paper CT IVth International Workshop on Low Temperature Detectors for Neutrinos and Dark Matter (LTD-4) CY SEP 04-07, 1991 CL OXFORD, ENGLAND SP UNIV OXFORD, DEPT PHYS, INST PHYS, NUCL & PARTICLE PHYS DIV, INST PHYS, HIGH ENERGY PARTICLE PHYS GRP, LECROY LTD, OXFORD INSTRUMENTS LTD C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 1 Z9 1 U1 0 U2 0 PU EDITIONS FRONTIERES PI DREUX PA 7 AVENUE KENNEDY, 28100 DREUX, FRANCE BN 2-86332-113-7 PY 1992 BP 347 EP 364 PG 18 WC Physics, Applied; Physics, Condensed Matter; Physics, Particles & Fields SC Physics GA BB01T UT WOS:A1992BB01T00037 ER PT B AU HOOVER, JM HENRY, RA LINDSAY, GA NADLER, MP NEE, SF SELTZER, MD STENGERSMITH, JD AF HOOVER, JM HENRY, RA LINDSAY, GA NADLER, MP NEE, SF SELTZER, MD STENGERSMITH, JD BE STROEVE, P BALAZS, AC TI LANGMUIR-BLODGETT MULTILAYERS OF FLUORINATED, MAIN-CHAIN CHROMOPHORIC, OPTICALLY NONLINEAR POLYMERS SO MACROMOLECULAR ASSEMBLIES IN POLYMERIC SYSTEMS SE ACS SYMPOSIUM SERIES LA English DT Proceedings Paper CT SYMP ON MACROMOLECULAR ASSEMBLIES IN POLYMERIC SYSTEMS, AT THE 201ST NATIONAL MEETING OF THE AMERICAN CHEMICAL SOC CY APR 14-19, 1991 CL ATLANTA, GA SP AMER CHEM SOC, DIV POLYM CHEM RP HOOVER, JM (reprint author), USN,CTR WEAP,DEPT RES,CHINA LAKE,CA 93555, USA. NR 0 TC 2 Z9 2 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA WASHINGTON BN 0-8412-2427-7 J9 ACS SYM SER PY 1992 VL 493 BP 94 EP 103 PG 10 WC Polymer Science SC Polymer Science GA BW05N UT WOS:A1992BW05N00009 ER PT J AU MILLER, JB CORY, DG BUTLER, LG GARROWAY, AN AF MILLER, JB CORY, DG BUTLER, LG GARROWAY, AN TI MULTIPLE PULSE NMR IMAGING OF POLYMERS AND CHEMISTRY SO MAGNETIC RESONANCE IMAGING LA English DT Article; Proceedings Paper CT 1ST FORUM AMPERE - MAGNETIC RESONANCE NEW METHODOLOGIES : IMPACT ON INDUSTRIAL RESEARCH CY NOV 21-23, 1991 CL ROME, ITALY SP CNR, UNIV ROME LA SAPIENZA, DIPT FIS, BRACCO IND CHIM, ESAOTE BIOMED, ENIRICERCHE, BRUKER ANAL MESSTECH, ENTE PROV TURISMO DE NMR IMAGING; MULTIPLE PULSE; SOLIDS; CHEMICAL REACTIONS AB Multiple pulse line narrowing techniques can be used to improve resolution and sensitivity in solid state NMR imaging. For example, pulse sequences which remove homonuclear dipolar broadening have been used to image proton-containing materials. Further enhancements in resolution and sensitivity are obtained by removing inhomogeneous interactions such as chemical shift, susceptibility, and heteronuclear dipolar broadening. Pulse sequences have been designed which provide efficient line narrowing over large spectral widths by taking into account the experimenter's control over the amplitude and time dependence of the gradient-induced resonance offset. These methods have been applied to centimeter sized samples to obtain images of polymers, composite materials, and gas-solid chemical reactions. T1 and T2 contrast allows differentiation between materials. RP MILLER, JB (reprint author), USN,RES LAB,DIV CHEM,CODE 6122,WASHINGTON,DC 20375, USA. NR 0 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0730-725X J9 MAGN RESON IMAGING JI Magn. Reson. Imaging PY 1992 VL 10 IS 5 BP 789 EP 791 DI 10.1016/0730-725X(92)90413-T PG 3 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JQ278 UT WOS:A1992JQ27800013 PM 1461073 ER PT J AU CHERKIS, NZ CHAVES, DA COSTA, LC AF CHERKIS, NZ CHAVES, DA COSTA, LC TI THE BATHYMETRY AND DISTRIBUTION OF THE BAHIA SEAMOUNTS, BRAZIL BASIN SO MARINE GEOLOGY LA English DT Article ID PLATE AB Geophysical measurements taken aboard R.V. Conrad in March 1988 and February-March 1989 revealed the subtle morphology and structure of the Bahia Seamount group. Three distinct seamount chains comprise the seamount group, two of which are remarkably parallel and linear. Radiometric dates were obtained from the analysis of dredge samples from two of the seamounts, and display dates of origin of approximately 78 m.y. B.P. (late Cretaceous), which is only slightly younger than the underlying crust, i.e., middle to late Cretaceous. The chains are completely separated by thickly sedimented, only slightly disturbed sedimentary basins, indicating a long period of stable existence. The peaks appear to fall into three distinct classes: (a) round, steep-peaked volcanoes; (b) flat-topped, small-to-medium sized guyots, and (c) elongated peaks. Most of the peaks appear to have been eroded or altered, either by mass-wasting or by later episodes of volcanism. Samples from all of the seamounts that have been dredged contain complex mineral crusts indicating low temperature hydrothermal activity. Pernambuco Channel flows through the region and is a fully incised, bottom-meandering river-like channel, whose generally northerly course is partly controlled by the positions of the seamounts. It is believed that the channel reflects erosion by northward-flowing Antarctic bottom water, which traverses the Argentine and Brazil Basins and is funnelled through existing topographic gaps, causing increased flow and transport of marine sediments prior to terminating in the open parts of the northern Brazil Basin. C1 DIRETORIA HIDROGRAFIA & NAVEGACAO,DEPT GEOFIS,BR-24040 RIO DE JANEIRO,BRAZIL. RP CHERKIS, NZ (reprint author), USN,RES LAB,WASHINGTON,DC, USA. NR 30 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0025-3227 J9 MAR GEOL JI Mar. Geol. PD JAN PY 1992 VL 103 IS 1-3 BP 335 EP 347 DI 10.1016/0025-3227(92)90024-C PG 13 WC Geosciences, Multidisciplinary; Oceanography SC Geology; Oceanography GA HG308 UT WOS:A1992HG30800019 ER PT J AU JURAS, J CEBULSKI, D AF JURAS, J CEBULSKI, D TI SHIP TOPSIDE INTEGRATION AND ELECTROMAGNETIC-INTERFERENCE CONTROL SO MARINE TECHNOLOGY AND SNAME NEWS LA English DT Article AB Electromagnetic interference (EMI) is rapidly becoming one of the major contributors to mission degradation in the U.S. Fleet today. Topside design and integration efforts have been used to reduce EMI, but this is not the total solution to the problem. A program of total ship and system EMI control must be implemented that will span battle groups and be effective during joint operations before optimum combat system effectiveness can be realized. This paper gives examples of some of the major EMI problems in the fleet today. It discusses both intraship and intership EMI problems, how these problems arose, and how they might have been prevented through the use of techniques such as frequency management, equipment design, better element placement and improved cable shielding. It describes the current topside design process, electromagnetic compatibility (EMC) improvements being made and traces the history of EMC requirements and their application to date. It also describes a developing program for managing ship topside arrangement configuration. The authors project where the challenges lie for future topside and EM engineering designers and describe how the equipment acquisition process must improve in order to meet the challenge of effective EMI control. RP JURAS, J (reprint author), USN,SEA SYST COMMAND,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 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 JAN PY 1992 VL 29 IS 1 BP 36 EP 49 PG 14 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA HB423 UT WOS:A1992HB42300006 ER PT J AU VERNON, SN LIU, JM AF VERNON, SN LIU, JM TI EDDY-CURRENT PROBE DESIGN FOR ANISOTROPIC COMPOSITES SO MATERIALS EVALUATION LA English DT Article RP VERNON, SN (reprint author), USN,CTR SURFACE WARFARE,MAT EVALUAT BRANCH,CODE R34,SILVER SPRING,MD 20903, USA. NR 0 TC 3 Z9 3 U1 1 U2 1 PU AMER SOC NON-DESTRUCTIVE TEST PI COLUMBUS PA 1711 ARLINGATE LANE PO BOX 28518, COLUMBUS, OH 43228-0518 SN 0025-5327 J9 MATER EVAL JI Mater. Eval. PD JAN PY 1992 VL 50 IS 1 BP 36 EP & PG 0 WC Materials Science, Characterization & Testing SC Materials Science GA GY805 UT WOS:A1992GY80500003 ER PT J AU PICKETT, D AF PICKETT, D TI SCATTERING-THEORY FOR HYPERBOLIC-EQUATIONS OF ORDER-2M SO MATHEMATICAL METHODS IN THE APPLIED SCIENCES LA English DT Article AB Given self-adjoint operators H(j) on Hilbert spaces H(j), j = 0, 1, and J is-an-element-of H(H0, H1) (where H (H0 H1) denotes the set of bounded linear operators from H0 to H1), define the wave operators W+(H1, H0, J)f = [GRAPHICS] e(irH) Je( h0) P0f, f is-an-element-of H0, where P0 is the projection onto the subspace for absolute continuity for H0. We use (i) to study the scattering problem associated with a pair of equations each of the form [GRAPHICS] (d2/dt2 + alpha(j)L)u(t) = 0, t is-an-element-of R, where L is a positive, self-adjoint operator on a Hilbert space X, m is a positive integer and the alpha(j) are distinct positive constants. Methods patterned after those of Kato are used to study two equations (that is for L - L0 and L = L1) each of the form (ii). We show that they are equivalent to equations of the form d/dt upsilon(k)(t) = -iH(k)upsilon(k)(t), t is-an-element-of R, k = 0, 1, where each H(k) is a self-adjoint operator on an associated Hilbert space H(k). Now suppose the wave operators W+(L1, L0) exist and are complete. Then we can find a J is-an-element-of H(H1, H0) such that W+(H1, H0, J) exists. In the case where L0 and L1 have the same domain, H1 and H0 are equal as vector spaces, and under certain conditions (on L(j), i = 0, 1)H0 and H1 have equivalent norms. Assuming these conditions, let J' is-an-element-of H(H1, H0) be the identify map. We show that (with an additional assumption on L0 and L1) W+(H1, H0, J') exists and is equal to W+(H1, H0, J). RP PICKETT, D (reprint author), USN,CTR AIR DEV,WARMINSTER,PA 18974, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0170-4214 J9 MATH METHOD APPL SCI JI Math. Meth. Appl. Sci. PD JAN PY 1992 VL 15 IS 1 BP 57 EP 71 DI 10.1002/mma.1670150106 PG 15 WC Mathematics, Applied SC Mathematics GA HB945 UT WOS:A1992HB94500005 ER PT J AU SPANOS, G AF SPANOS, G TI THE MORPHOLOGY, CRYSTALLOGRAPHY, AND MECHANISM OF CARBIDE PRECIPITATION IN AN FE-0.12 PCT C-3.28 PCT NI-ALLOY SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID LAMELLAR EUTECTOID REACTIONS; FUNDAMENTAL DISTINCTION; BOUNDARIES; AUSTENITE; FERRITE; BAINITE; DECOMPOSITION; STEEL AB Carbide precipitation during the eutectoid decomposition of austenite has been studied in an Fc-0.12 pct C-3.28 pct Ni alloy by transmission electron microscopy (TEM) supplemented by optical microscopy. Nodular bainite which forms during the latter stages of austenite decomposition at 550-degrees-C exhibits two types of carbide arrangement: (a) banded interphase boundary carbides with particle diameters of about 20 to 90 nm and mean band spacings between 180 and 390 nm and (b) more randomly distributed ("nonbanded") elongated particles exhibiting a wide range of lengths between 33 and 2500 nm, thicknesses of approximately 11 to 50 nm, and mean intercarbide spacings of approximately 140 to 275 nm. Electron diffraction analysis indicated that in both cases, the carbides are cementite, obeying the Pitsch orientation relationship with respect to the bainitic ferrite. The intercarbide spacings of both morphologies are significantly larger than those previously reported for similar microstructures in steels containing alloy carbides other than cementite (e.g., VC, TiC). Both curved and straight cementite bands were observed; in the latter case, the average plane of the interphase boundary precipitate sheets was near {110}alpha parallel-to {011}c, consistent with cementite precipitation on low-energy {110}alpha parallel-to {III}gamma ledge terrace planes (where alpha, gamma, and c refer to ferrite, austenite, and cementite, respectively). The results also suggest that the first stage in the formation of the nonbanded form of nodular bainite is often the precipitation of cementite rods, or laths, in austenite at the alpha:gamma interfaces of proeutectoid ferrite secondary sideplates formed earlier. Although these cementite rods frequently resemble the "fibrous" microstructures observed by previous investigators in carbide-forming alloy steels, they are typically much shorter than fibrous alloy carbides. The bainitic microstructures observed here are analyzed in terms of a previously developed model centered about the roles of the relative nucleation and growth rates of the product phases in controlling the evolution of eutectoid microstructures. RP SPANOS, G (reprint author), USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375, USA. NR 43 TC 7 Z9 8 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD JAN PY 1992 VL 23 IS 1 BP 171 EP 181 DI 10.1007/BF02660863 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA HB948 UT WOS:A1992HB94800020 ER PT J AU WOODRUFF, SI CONWAY, TL LINENGER, JM AF WOODRUFF, SI CONWAY, TL LINENGER, JM TI AN ASSESSMENT OF PRE-FITNESS AND POST-FITNESS MEASURES IN 2 REMEDIAL CONDITIONING PROGRAMS SO MILITARY MEDICINE LA English DT Article AB The purpose of this study was to determine if taking part in a command-organized remedial physical condition program based on the OPNAVINST 6110.1 Basic Exercise Program (BEP) is effective in reducing body fat, improving failure-specific performance on components of the Physical Readiness Test (PRT), and improving overall physical fitness level. Pre- and post-program PRT results collected for participants in two BEP-based remedial programs showed trends toward improvement in performance on the curl-ups, push-ups, and run/walk tests as well as a positive change in overall classification scores and percent of participants passing the follow-up PRT. A substantive impact on body fat reduction was not demonstrated. RP WOODRUFF, SI (reprint author), NAVAL HLTH RES CTR,HLTH SERV RES DEPT,POB 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 3 Z9 3 U1 0 U2 1 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 JAN PY 1992 VL 157 IS 1 BP 25 EP 30 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA GZ717 UT WOS:A1992GZ71700013 PM 1603373 ER PT J AU PACE, MD AF PACE, MD TI FREE-RADICAL MECHANISMS IN HIGH-DENSITY NITROCOMPOUNDS - HEXANITROISOWURTZITANE, A NEW HIGH-ENERGY NITRAMINE SO MOLECULAR CRYSTALS AND LIQUID CRYSTALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON THE CHEMISTRY OF THE ORGANIC SOLID STATE ( ICCOSS 10 ) CY JUL 07-12, 1991 CL UNIV BRITISH COLUMBIA, VANCOUVER, CANADA SP CHEM INST CANADA, NAT SCI & ENGN RES COUNCIL CANADA, PETR RES FUND, UNIV BRIT COLUMBIA, BRUKER SPECTROSPIN CANADA, CHEMAGNETICS, DOTY SCI, GORDON & BREACH SCI PUBL HO UNIV BRITISH COLUMBIA DE ENERGETIC MATERIALS; ELECTRON PARAMAGNETIC RESONANCE; ELECTRON-NUCLEAR DOUBLE RESONANCE; FREE RADICALS; HEXANITROISOWURTZITANE; NITROXYL RADICAL RP PACE, MD (reprint author), USN,RES LAB,CODE 6122,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0140-6566 J9 MOL CRYST LIQ CRYST PY 1992 VL 219 BP 139 EP 148 DI 10.1080/10587259208032126 PG 10 WC Crystallography SC Crystallography GA JD451 UT WOS:A1992JD45100015 ER PT J AU PACE, MD WEBER, R AF PACE, MD WEBER, R TI ENDOR AND EPR OF A NITROXYL RADICAL FORMED FROM N,2,4,6-TETRANITRO-N-METHYLANILINE SO MOLECULAR CRYSTALS AND LIQUID CRYSTALS LA English DT Article ID IMPACT C1 BRUKER INSTRUMENTS INC,BILLERICA,MA 01821. RP PACE, MD (reprint author), USN,RES LAB,CODE 6122,WASHINGTON,DC 20375, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0140-6566 J9 MOL CRYST LIQ CRYST PY 1992 VL 214 BP 189 EP 202 DI 10.1080/10587259208037293 PG 14 WC Crystallography SC Crystallography GA JD126 UT WOS:A1992JD12600017 ER PT J AU CHING, WM CARL, M DASCH, GA AF CHING, WM CARL, M DASCH, GA TI MAPPING OF MONOCLONAL-ANTIBODY BINDING-SITES ON CNBR FRAGMENTS OF THE S-LAYER PROTEIN ANTIGENS OF RICKETTSIA-TYPHI AND RICKETTSIA-PROWAZEKII SO MOLECULAR IMMUNOLOGY LA English DT Article ID CRYSTALLINE SURFACE-LAYERS; ARRAY PROTEINS; T-CELL; BACTERIA; PURIFICATION; EXPRESSION; SEQUENCE; ASSAY; ACID AB The 120 kDa surface protein antigens (SPAs) of typhus rickettsiae lie external to the outer membrane in regular arrays and chemically resemble the S-layer proteins of other bacteria. These proteins elicit protective immune responses against the rickettsiae. In order to study the immunochemistry of these proteins, purified SPAs from Rickettsia typhi and Rickettsia prowazekii were fragmented with CNBr. The fragments were separated by SDS-PAGE and were recovered on PVDF membrane following electroblotting. The origin of eight major fragments from R. prowazekii and seven major fragments from R. typhi was determined by automated N-terminal amino acid sequencing and by comparison with the DNA sequence encoding R. prowazekii SPA. The cleavage patterns and protein sequences of the two proteins differed significantly. CNBr fragments corresponding to the C-terminus (amino acid 1372-1612 of the deduced sequence from encoding gene spaP) were not present in both SPAs. This suggests that the corresponding C-terminal region was not synthesized or was removed during SPA translocation to the cell surface. Modified amino acids were detected in each protein. Eighteen monoclonal antibodies selected for varied reactivity with both native and denatured SPA proteins could be classified into eight different types based on western blot analysis of the CNBr fragments. Six of the monoclonal antibody types reacted predominantly with a single region of the SPAs. Two types of antibodies bound to several CNBr fragments which contained both limited sequence similarity and modified amino acids either of which might account for the multisite binding of these antibodies. RP CHING, WM (reprint author), USN,MED RES INST,DEPT INFECT DIS,DIV RICKETTSIAL DIS,BETHESDA,MD 20889, USA. NR 38 TC 21 Z9 27 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0161-5890 J9 MOL IMMUNOL JI Mol. Immunol. PD JAN PY 1992 VL 29 IS 1 BP 95 EP 105 PG 11 WC Biochemistry & Molecular Biology; Immunology SC Biochemistry & Molecular Biology; Immunology GA HG033 UT WOS:A1992HG03300012 PM 1370573 ER PT J AU HOLT, TR RAMAN, S AF HOLT, TR RAMAN, S TI 3-DIMENSIONAL MEAN AND TURBULENCE STRUCTURE OF A COASTAL FRONT INFLUENCED BY THE GULF-STREAM SO MONTHLY WEATHER REVIEW LA English DT Article ID ATMOSPHERIC BOUNDARY-LAYER; OCEANIC FRONT; FRONTOGENESIS; AIRCRAFT; VICINITY; GALE AB The interaction of oceanic fronts in the vicinity of the Gulf Stream with an atmospheric coastal front during the Genesis of Atlantic Lows Experiment (GALE) is examined using aircraft, satellite, and ship data. The nearshore, midshelf, and Gulf Stream oceanic fronts are readily discernible from low-level aircraft radiometer and satellite imagery data. The three-dimensional (3D) structure of the coastal front is extensively mapped by low-level aircraft transects through the frontal boundary. Results confirm the existence of the coastal front as a very shallow (depth less than 200 m), spatially inhomogeneous, undulating material surface. Aircraft observations from 2000 to 2200 UTC (late afternoon local time) show a surface location of the coastal front that is aligned over the Gulf Stream oceanic front under conditions of very weak (2 m s-1) onshore flow, but is observed to migrate shoreward for stronger onshore flow. Ahead of the front in the warm air, the marine atmospheric boundary layer is characterized as well mixed with broken cumulus and stratocumulus cloud bases observed near 500 m, and tops varying from 1300 to 1900 m. The dominant scale of turbulent eddies is observed to be on the order of the boundary-layer depth. Conditional sampling statistics point to a strong direct circulation ahead of the front dominated by intense, narrow, warm updrafts, and broader, less intense, cool downdrafts. Behind the coastal front in the cold air, visibility is much reduced by low-level fractus and layered stratocumulus clouds. The shallow subcloud layer is observed to be generally moister and more statically stable than ahead of the front. It is also characterized by an indirect circulation with more prevalent cool updrafts and warm downdrafts, particularly for the near-cloud-base region. However, behind the front there exists a strong thermodynamic coupling of atmosphere and ocean as evidenced by the distinctly different atmospheric regimes present over the oceanic nearshore and midshelf front regions. Over the nearshore region, the horizontal wind structure is dominated by 100-m waves imbedded in a weaker 1-2-km circulation. Warm updrafts are observed over the nearshore waters, but the smaller air-sea temperature difference effectively limits large temperature perturbations. Hence, much smaller sensible heat flux is evident over the nearshore region as compared to the oceanic midshelf region. Over the midshelf region, turbulent eddies on the scale of 1. 5 times the depth of the front ( 120 m) are solely responsible for the larger positive heat flux. The transition zone of the coastal front aloft near 150 m is remarkably confined to just the oceanic nearshore shelf, located between the nearshore waters and the midshelf region. The frontal surface itself is observed to play an important role in the 3D atmospheric circulation in the vicinity of the front. The front causes a decoupling of the region just above the frontal surface by inhibiting the vertical transfer of fluxes from the surface. Cospectra for regions just above the front show no contributions from smaller waves generated by near-surface processes (on the order of 100-500 m) that are evident just ahead of the front. This suggests a decoupling due to the frontal boundary. Associated with this decoupling and the subsequent stabilization of the region above the front is the occurrence of buoyancy waves. These waves of wavelength approximately 840 m are believed to be a result of penetrating thermals and/or instabilities present along the frontal surface. C1 N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI,RALEIGH,NC 27695. RP HOLT, TR (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 30 TC 15 Z9 16 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 JAN PY 1992 VL 120 IS 1 BP 17 EP 39 DI 10.1175/1520-0493(1992)120<0017:TDMATS>2.0.CO;2 PG 23 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HB424 UT WOS:A1992HB42400002 ER PT J AU WASH, CH HALE, RA DOBOS, PH WRIGHT, EJ AF WASH, CH HALE, RA DOBOS, PH WRIGHT, EJ TI STUDY OF EXPLOSIVE AND NONEXPLOSIVE CYCLOGENESIS DURING FGGE SO MONTHLY WEATHER REVIEW LA English DT Article ID DATA ASSIMILATION; ECMWF; CLIMATOLOGY; CYCLONES AB Explosive cyclogenesis during the winter of the First Global GARP Experiment (January-February 1979) is analyzed using the revised European Centre for Medium Range Weather Forecasts (ECMWF) analyses. Explosive cyclogenesis is defined as a decrease in the sea level pressure at the rate of 1 mb h-1 for at least 12 h. Diagnostics for 23 explosively developing cases and 16 nonexplosive cases are evaluated. Parameters compared include the dry static stability, low-level relative vorticity, vorticity advection, upper-level divergence, kinematic vertical velocities, and the strength of the low-level baroclinity. These parameters are compared statistically at the initial, 12-, and 24-h time periods. Parameters for which the explosive and nonexplosive cyclone ensembles were statistically separable are the kinematic vertical velocity and the upper-level divergence and vorticity advection. The strong upper-level processes for the explosive cases at the initial time indicate the importance of upper-tropospheric features in producing the stronger vertical motions and more rapid cyclogenesis. RP WASH, CH (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 24 TC 10 Z9 12 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 JAN PY 1992 VL 120 IS 1 BP 40 EP 51 DI 10.1175/1520-0493(1992)120<0040:SOEANC>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HB424 UT WOS:A1992HB42400003 ER PT B AU MAYER, RH MCCORMICK, ME AF MAYER, RH MCCORMICK, ME GP MAROME TECHNOL SOC TI A COST-EFFECTIVE DESIGN STUDY OF A NEAR-SHORE PNEUMATIC WAVE ENERGY CONVERSION SYSTEM SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN ACAD,DEPT NAVAL ARCHITECTURE OCEAN & MARINE ENGN,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 81 EP 86 PG 6 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00013 ER PT B AU HAWKINS, S AF HAWKINS, S GP MAROME TECHNOL SOC TI CROSS-INDUSTRY TECHNOLOGY TRANSFER MECHANISMS SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN,CTR SURFACE WARFARE,DAVID TAYLOR MODEL BASIN,PROGRAM DEV OFF,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 133 EP 139 PG 7 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00020 ER PT B AU ROSEMAN, DP SIRKAR, J COJEEN, HP AF ROSEMAN, DP SIRKAR, J COJEEN, HP GP MAROME TECHNOL SOC TI TANKER DESIGN REQUIREMENTS IN THE AFTERMATH OF OPA-90 SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN,CTR SURFACE WARFARE,CARDEROCK DIV,BETHESDA,MD 20084. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 175 EP 182 PG 8 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00026 ER PT B AU WOHL, GM BERTOIA, CA AF WOHL, GM BERTOIA, CA GP MAROME TECHNOL SOC TI OPERATIONAL DEMONSTRATION OF ERS-1 SAR IMAGERY AT THE JOINT ICE CENTER SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN,NOAA,JOINT ICE CTR,NATL WEATHER SERV,WASHINGTON,DC 20395. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 429 EP 433 PG 5 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00068 ER PT B AU BENNER, DA AF BENNER, DA GP MAROME TECHNOL SOC TI ARCTIC METEOROLOGICAL MEASUREMENTS FOR GLOBAL CLIMATE CHANGE SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN,NOAA,JOINT ICE CTR,WASHINGTON,DC 20395. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 493 EP 497 PG 5 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00077 ER PT B AU FELL, P AF FELL, P GP MAROME TECHNOL SOC TI EXTENDING GEODETIC CONTROL ONTO THE SEAFLOOR SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN,CTR SURFACE WARFARE,DEPT STRATEG SYST,DAHLGREN,VA 22448. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 623 EP 627 PG 5 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00096 ER PT B AU BROZENA, JM PETERS, MF FORSBERG, R AF BROZENA, JM PETERS, MF FORSBERG, R GP MAROME TECHNOL SOC TI DIRECT MEASUREMENT OF ABSOLUTE SEA-SURFACE HEIGHT FROM AN AIRCRAFT SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 628 EP 634 PG 7 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00097 ER PT B AU COOPER, KR AF COOPER, KR GP MAROME TECHNOL SOC TI SEARCH AND SALVAGE OPERATIONS IN 17,251 FEET OF WATER SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 NAVAL SEA SYST COMMAND,OFF DIRECTOR OCEAN ENGN,WASHINGTON,DC 20362. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 744 EP 750 PG 7 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00117 ER PT B AU HONEY, RM AF HONEY, RM GP MAROME TECHNOL SOC TI UNITED-STATES-NAVY DIVING MANUAL VOLUME-I REVISION SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 NAVAL SEA SYST COMMAND,WASHINGTON,DC 20362. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 751 EP 753 PG 3 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00118 ER PT B AU FORREST, JB AF FORREST, JB GP MAROME TECHNOL SOC TI DRIVEN PLATE ANCHORS FOR NAVY MOORINGS SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN,NAVAL CIVIL ENGN LAB,PORT HUENEME,CA 93043. NR 0 TC 0 Z9 0 U1 0 U2 1 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 816 EP 822 PG 7 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00127 ER PT B AU FAGOT, MG SWENSON, RC AF FAGOT, MG SWENSON, RC GP MAROME TECHNOL SOC TI A LARGE MOORED TRIPOD STRUCTURE FOR THE DEEP OCEAN SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 USN,RES LAB DETACHMENT,OCEAN SYST ANAL SECT,BAY ST LOUIS,MS 39529. NR 0 TC 0 Z9 0 U1 0 U2 1 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 913 EP 923 PG 11 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00140 ER PT B AU WAGNER, P LITTLE, B BORENSTEIN, S AF WAGNER, P LITTLE, B BORENSTEIN, S GP MAROME TECHNOL SOC TI THE INFLUENCE OF METALLURGY ON MICROBIOLOGICALLY INFLUENCED CORROSION SO MTS '92 - GLOBAL OCEAN PARTNERSHIP, PROCEEDINGS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 1992 Marine-Technology-Society Conference on Global Ocean Partnership CY OCT 19-21, 1992 CL WASHINGTON, DC SP MARINE TECHNOL SOC C1 NAVAL RES LAB,BAY ST LOUIS,MS 39529. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC PI WASHINGTON PA 1828 L ST NW, 9TH FL, WASHINGTON, DC 20036 BN 0-933957-11-4 PY 1992 BP 1044 EP 1052 PG 9 WC Engineering, Environmental; Engineering, Marine; Environmental Sciences; Oceanography SC Engineering; Environmental Sciences & Ecology; Oceanography GA BC83X UT WOS:A1992BC83X00158 ER PT B AU JENSEN, KL GANGULY, AK AF JENSEN, KL GANGULY, AK BE Miller, JJH TI SIMULATION OF QUANTUM TUNNELING - TRANSMISSION COEFFICIENT VS WIGNER FUNCTION APPROACHES SO NASECODE VIII LA English DT Proceedings Paper CT 8th International Conference on the Numerical Analysis of Semiconductor Devices and Integrated Circuits (NASECODE VIII) CY MAY 19-22, 1992 CL VIENNA, AUSTRIA C1 USN,RES LAB,WASHINGTON,DC 20375. RI Jensen, Kevin/I-1269-2015 OI Jensen, Kevin/0000-0001-8644-1680 NR 0 TC 0 Z9 0 U1 0 U2 0 PU BOOLE PRESS LTD PI DUBLIN PA PO BOX NO 5, 51 SANDYCOVE ROAD, DUBLIN, IRELAND BN 1-85748-000-7 PY 1992 BP 44 EP 45 PG 2 WC Engineering, Electrical & Electronic; Mathematics, Applied SC Engineering; Mathematics GA BA21Z UT WOS:A1992BA21Z00021 ER PT J AU MEINIG, G AF MEINIG, G TI ENGINEERING FOR ELECTRONICS DESIGN AND PRODUCTION SYMPOSIUM SO NAVAL ENGINEERS JOURNAL LA English DT Article RP MEINIG, G (reprint author), USN,CTR SURFACE WARFARE,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JAN PY 1992 VL 104 IS 1 BP 26 EP 27 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HA284 UT WOS:A1992HA28400001 ER PT J AU HERMAN, S LOESER, CT AF HERMAN, S LOESER, CT TI DAMAGE CONTROL - THE LAST LINE OF SHIPBOARD DEFENSE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper addresses the ship, system and equipment design features, operational doctrine and training that has been developed to provide effective shipboard damage control. Both the ship and the sailor are addressed, since both are integral and interdependent components of the damage control "system." Also, the enhancements afforded to protection of personnel from the effects of conventional and nonconventional weapons are discussed. Finally, a brief look into the future is presented. With the shrinking defense budget and corresponding reduction in fleet size and ship manning, novel system designs and automated decision aids will be required to do the job. RP HERMAN, S (reprint author), USN,SEA SYST COMMAND,SHIP SURVIVABIL SUBGRP SEA 55X,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JAN PY 1992 VL 104 IS 1 BP 63 EP 79 PG 17 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HA284 UT WOS:A1992HA28400005 ER PT J AU NUSSBAUM, ES SEBRING, LA WOLF, AL MIRVIS, SE GOTTLIEB, R AF NUSSBAUM, ES SEBRING, LA WOLF, AL MIRVIS, SE GOTTLIEB, R TI MYELOGRAPHIC AND ENHANCED COMPUTED TOMOGRAPHIC APPEARANCE OF ACUTE TRAUMATIC SPINAL-CORD AVULSION SO NEUROSURGERY LA English DT Article DE COMPUTED TOMOGRAPHY; SPINAL CORD; SPINAL CORD AVULSION; SPINE ID BREECH PRESENTATION; MR; INJURY; HYPEREXTENSION; TRANSECTION; METRIZAMIDE AB The neuroradiological findings that revealed spinal cord transection/laceration in 6 patients with acute, blunt spinal trauma are described. Four patients suffered cervical spine injuries, and two had thoracic injuries. Initially, all patients had complete neurological deficit at the level of injury. The deficit improved in only 1 patient. On the basis of clinical history and spinal radiographs, spinal hyperflexion with distraction was the predominant mechanism of injury in our patients. Computed tomography with intrathecal contrast was performed on all patients and was always diagnostic. Visualization of intrathecal contrast material accumulating within the cord or the absence of cord shadow within the contrast column established the diagnosis in all cases. A dural tear was noted in 3 patients. Thoracic myelography was performed in 2 patients and, in both, demonstrated contrast pooling within the spinal cord at the level of the laceration. Magnetic resonance imaging was obtained in 1 patient and revealed an irregular, low-signal-intensity, intramedullary region extending to the cord surface on T1-weighted axial images. The myelographic and enhanced computed tomographic appearances of acute, traumatic spinal cord avulsion/laceration, which have been infrequently reported in the literature, are described. C1 UNIV MARYLAND,MED SYST,DIV NEUROL SURG,22 S GREENE ST,BALTIMORE,MD 21201. UNIV MARYLAND,MED SYST,DEPT DIAGNOST RADIOL,BALTIMORE,MD 21201. USN HOSP,DEPT RADIOL,BETHESDA,MD 20814. NR 27 TC 3 Z9 3 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 JAN PY 1992 VL 30 IS 1 BP 43 EP 48 PG 6 WC Clinical Neurology; Surgery SC Neurosciences & Neurology; Surgery GA GW138 UT WOS:A1992GW13800008 PM 1738454 ER PT J AU COLOMBANT, D LAU, YY AF COLOMBANT, D LAU, YY TI FURTHER-STUDIES ON BEAM BREAKUP GROWTH REDUCTION BY CAVITY CROSS-COUPLINGS IN RECIRCULATING ACCELERATORS - EFFECTS OF LONG PULSE LENGTH AND MULTITURN RECIRCULATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Cavity cross-coupling was recently found to reduce beam breakup (BBU) growth in a recirculating accelerator known as the Spiral Line Induction Accelerator (SLIA). Here, we extend the analyses in two respects: long beam pulse lengths and a SLIA upgrade geometry which accelerates a 10 kA, 35 ns beam to 25 MeV via a 70 cavity, 7 turn recirculation. We found that when the beam pulse length-tau exceeds the beam's transit time-tau' between cross-coupled cavities, BBU growth may be worsened as a result of the cross-couplings among cavities. This situation is not unlike other long pulse recirculating accelerators where beam recirculation leads to beam breakup of a regenerative type. Thus, the advantage of BBU reduction by cavity cross-coupling is restricted primarily to beams with tau < tau', a condition envisioned for all SLIA geometries. For the 70 gap, 7 turn SLIA upgrade, we found that cavity cross-coupling may reduce BBU growth up to factors of a thousand when the quality factor Q of the deflecting modes are relatively high (like 100). In these high Q cases. the amount of growth reduction depends on the arrangement and sequence of beam recirculation. For Q less-than-or-approximately 20, BBU growth reduction by factors of hundreds is observed, but this reduction is insensitive to the sequence of beam recirculation. The above conclusions were based on simple models of cavity coupling that have been used in conventional microwave literature. Not addressed is the detail design consideration that leads to the desired degree of cavity coupling. RP COLOMBANT, D (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JAN 1 PY 1992 VL 311 IS 1-2 BP 1 EP 9 DI 10.1016/0168-9002(92)90843-S PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GZ504 UT WOS:A1992GZ50400001 ER PT J AU EBBELING, WL BAHNA, SL AF EBBELING, WL BAHNA, SL TI FOOD ALLERGY DIAGNOSIS SO NUTRITION RESEARCH LA English DT Article DE FOOD ALLERGY; FOOD HYPERSENSITIVITY; SKIN TESTING; IGE ANTIBODIES; FOOD CHALLENGE ID SUB-CLASS ANTIBODIES; DOUBLE-BLIND; SENSITIVITY; IMMEDIATE; CHALLENGE; HYPERSENSITIVITY; CHILDREN; TESTS; ADULT; IGG AB While food hypersensitivity can be a life-threatening problem, its scope is yet to be fully developed. More work is needed to further define its parameters but basic food hypersensitivity has been significantly clarified in the decade of the 80's to become standard practice for most updated allergists. Studies related to inhalation of food antigens remains within the purview of research centers as does other immunologic processes. The diagnosis of food hypersensitivity remains dependent on the medical history with tests like elimination diets, skin testing, and RAST. Double-blind, placebo-controlled, food challenges (DBPCFC) provide the most definitive support for the association between certain symptoms and a specific food. C1 E TENNESSEE STATE UNIV, PEDIAT & MED, JOHNSON CITY, TN 37614 USA. E TENNESSEE STATE UNIV, PEDIAT ALLERGY & IMMUNOL, JOHNSON CITY, TN 37614 USA. RP EBBELING, WL (reprint author), NATL NAVAL MED CTR, DEPT INTERNAL MED, DIV ALLERGY IMMUNOL, BETHESDA, MD 20889 USA. NR 23 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 0271-5317 J9 NUTR RES JI Nutr. Res. PD JAN PY 1992 VL 12 IS 1 BP 137 EP 144 DI 10.1016/S0271-5317(05)80417-8 PG 8 WC Nutrition & Dietetics SC Nutrition & Dietetics GA HL924 UT WOS:A1992HL92400013 ER PT J AU SCHACHTE, WL AF SCHACHTE, WL TI THE VALUE OF THE 1982 UN CONVENTION ON THE LAW OF THE SEA - PRESERVING OUR FREEDOMS AND PROTECTING THE ENVIRONMENT SO OCEAN DEVELOPMENT AND INTERNATIONAL LAW LA English DT Editorial Material AB As exhibited in ongoing environmental fora, world attention is being focused on the marine environment with particular attention to the sustainable development of ocean resources. In this context it is equally important to ensure that emerging principles of environmental protection continue to reflect the deliberate balance between the preservation of navigational freedoms and protection of the marine environment as reflected in the 1982 United Nations Law of the Sea Convention. This article reviews how Part XII of the Convention provides a modern framework for environmental norms that are appropriate in light of the competing interests affecting ocean uses. The author concludes that strict adherence to the Part XII framework is in the best interests of the security, economic, and environmental interests of all nations. RP SCHACHTE, WL (reprint author), USN,OCEAN POLICY AFFAIRS,WASHINGTON,DC 20350, USA. NR 16 TC 2 Z9 2 U1 0 U2 1 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0090-8320 J9 OCEAN DEV INT LAW JI Ocean Dev. Int. Law PD JAN-MAR PY 1992 VL 23 IS 1 BP 55 EP 69 PG 15 WC International Relations; Law SC International Relations; Government & Law GA JC212 UT WOS:A1992JC21200004 ER PT J AU KRIEBEL, DL AF KRIEBEL, DL TI NONLINEAR-WAVE INTERACTION WITH A VERTICAL CIRCULAR-CYLINDER .2. WAVE RUN-UP SO OCEAN ENGINEERING LA English DT Article AB Theoretical results for second-order wave run-up around a large diameter vertical circular cylinder are compared to results of 22 laboratory experiments conducted in regular nonlinear waves. In general, the second-order theory explains a significant portion of the nonlinear wave run-up distribution measured at all angles around the cylinder. At the front of the cylinder, for example, measured maximum run-up exceeds linear theory by 44% on average but exceeds the nonlinear theory by only 11% on average. In some cases, both measured run-up and the second-order theory exceed the linear prediction by more than 50%. Similar results are found at the rear of the cylinder where the second-order theory predicts a large increase in wave amplitude for cases where the linear diffraction theory predicts little or no increase. Overall, the nonlinear diffraction theory is found to be valid for the same relative depth and wave steepness conditions applicable to Stokes second-order plane-wave theory. In the last section of the paper, design curves are presented for estimating the maximum second-order wave run-up for a wide range of conditions in terms of the relative depth, relative cylinder size, and wave steepness. RP KRIEBEL, DL (reprint author), USN ACAD,OCEAN ENGN PROGRAM,ANNAPOLIS,MD 21402, USA. NR 18 TC 54 Z9 58 U1 1 U2 5 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 JAN PY 1992 VL 19 IS 1 BP 75 EP 99 DI 10.1016/0029-8018(92)90048-9 PG 25 WC Engineering, Marine; Engineering, Civil; Engineering, Ocean; Oceanography SC Engineering; Oceanography GA HH562 UT WOS:A1992HH56200005 ER PT J AU MEDCALF, EA TAKAHASHI, T CHIBA, I MINNA, J MILNER, J AF MEDCALF, EA TAKAHASHI, T CHIBA, I MINNA, J MILNER, J TI TEMPERATURE-SENSITIVE MUTANTS OF P53 ASSOCIATED WITH HUMAN CARCINOMA OF THE LUNG SO ONCOGENE LA English DT Article ID TUMOR SUPPRESSOR PROTEIN; MONOCLONAL-ANTIBODIES; SIMIAN VIRUS-40; IMMUNOLOGICAL VARIANTS; GENE; TRANSFORMATION; ANTIGEN; CANCER; EXPRESSION; ONCOGENE AB We have compared the effects of specific point mutations on the tertiary and quaternary structure of the human p53 protein. Eight mutants, each derived from primary resected tissues of lung carcinomas, were expressed in vitro under strictly defined conditions, such that the only known variant was the point mutation present in each p53 mRNA. All the mutations were located in highly conserved domains. The tertiary structure of each mutant protein was investigated by reactivity with anti-p53 monoclonal antibodies directed against conformation-dependent epitopes. Quaternary structure was examined by gel filtration. Although all the mutant proteins exhibited abnormal tertiary structures, their quaternary structures appeared similar to wild type, the one exception being p53-tyr135, which contains tyrosine in place of cysteine at residue 135. The conformational phenotype of mutant human p53 was found to be dependent upon (i) the locus of the mutation and (ii) the nature of the amino acid substitution: two different substitutions at residue 273 yielded two mutants with differing structural properties. We have discovered three mutants of human p53 that are temperature sensitive for conformation; one is mutated at codon 273, a 'hotspot' for p53 mutation in human cancer. C1 UNIV CAMBRIDGE,DEPT PATHOL,DIV VIROL,TENNIS COURT RD,CAMBRIDGE CB2 1QP,ENGLAND. USN HOSP,NCI,MED ONCOL BRANCH,BETHESDA,MD 20814. RI Takahashi, Takashi/I-7262-2014 NR 32 TC 37 Z9 37 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD JAN PY 1992 VL 7 IS 1 BP 71 EP 76 PG 6 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA HC227 UT WOS:A1992HC22700010 PM 1741167 ER PT J AU MITSUDOMI, T STEINBERG, SM NAU, MM CARBONE, D DAMICO, D BODNER, S OIE, HK LINNOILA, RI MULSHINE, JL MINNA, JD GAZDAR, AF AF MITSUDOMI, T STEINBERG, SM NAU, MM CARBONE, D DAMICO, D BODNER, S OIE, HK LINNOILA, RI MULSHINE, JL MINNA, JD GAZDAR, AF TI P53 GENE-MUTATIONS IN NON-SMALL-CELL LUNG-CANCER CELL-LINES AND THEIR CORRELATION WITH THE PRESENCE OF RAS MUTATIONS AND CLINICAL-FEATURES SO ONCOGENE LA English DT Article ID POLYMERASE CHAIN-REACTION; TUMOR SUPPRESSOR GENE; SV40-TRANSFORMED CELLS; POINT MUTATIONS; BREAST-CANCER; MUTANT P53; WILD-TYPE; CARCINOMA; ONCOGENE; TRANSFORMATION AB We screened 77 non-small-cell lung cancer (NSCLC) cell lines for mutations of the p53 gene using a single-strand conformation polymorphism (SSCP) assay. We found that 57 cell lines (74%) had mutations of the p53 gene. Three cell lines had a deletion of the p53 gene. Of the remaining 54 cell lines, 49 cell lines were sequenced and 52 mutations were confirmed. In contrast to previously published p53 mutations in other human tumors, the p53 gene mutations in NSCLC were diverse with regard to the location and nature of the mutations. The region corresponding to codons 144-166, which is outside the evolutionarily conserved regions, was a frequent site of p53 gene mutations in NSCLC. The presence of a p53 gene mutation was not associated with age, sex, histological types, culture site, treatment intent, presence of prior cytotoxic treatment, neuroendocrine differentiation, median culture time or patient survival. The prevalence of p53 mutations in cell lines with ras mutations did not differ from that in cell lines without ras mutations. However, p53 gene mutations in NSCLC cell lines with ras mutations tended to cluster in exon 8, suggesting the presence of a functional domain of the p53 gene relating to interaction with the ras gene. We conclude that p53 and ras mutations are frequent and apparently independent genetic alterations which play different roles in the pathogenesis, progression and prognosis of NSCLC. C1 USN,NCI,MED ONCOL BRANCH,BETHESDA,MD 20889. NCI,BIOSTAT & DATA MANAGEMENT SECT,BETHESDA,MD 20889. UNIV TEXAS,SW MED CTR,SIMMONS CANC CTR,DALLAS,TX 75235. OI Mitsudomi, Tetsuya/0000-0001-9860-8505 NR 65 TC 468 Z9 469 U1 4 U2 12 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD JAN PY 1992 VL 7 IS 1 BP 171 EP 180 PG 10 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA HC227 UT WOS:A1992HC22700023 PM 1311061 ER PT J AU BERKOFF, TA KERSEY, AD AF BERKOFF, TA KERSEY, AD TI SIGNAL-PROCESSING TECHNIQUES FOR ABSOLUTE DISPLACEMENT STRAIN SENSING USING A FIBER INTERFEROMETER SO OPTICS AND LASERS IN ENGINEERING LA English DT Article AB We present two displacement sensing techniques which rely on amplitude variations of Bessel frequency components contained in the photodetected output of a phase modulated two-beam interferometer. Experimental results demonstrate demodulated output signals that correspond to the absolute optical path difference between the two arms of an interferometer. Optical displacements over a 50 mm range have been recorded with a resolution of 25 microns. Both approaches are suitable for passive remote sensing applications. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 7 TC 6 Z9 6 U1 1 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0143-8166 J9 OPT LASER ENG JI Opt. Lasers Eng. PY 1992 VL 16 IS 2-3 BP 153 EP 161 DI 10.1016/0143-8166(92)90006-S PG 9 WC Optics SC Optics GA HF604 UT WOS:A1992HF60400006 ER PT J AU MERMELSTEIN, MD BLODGETT, JA AF MERMELSTEIN, MD BLODGETT, JA TI SINGLE-MODE OPTICAL FIBER GONIOMETER SO OPTICS LETTERS LA English DT Article ID SCATTERING AB A two-element single-mode optical fiber goniometer that uses graded-index microlens receivers is presented that measures the angular orientation of a remote laser. The goniometer exhibits a sensitivity of 1.0 V/mrad and a calculated shot-noise-limited angular resolution of 1.0 nrad/square-root Hz. RP MERMELSTEIN, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 2 Z9 2 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 JAN 1 PY 1992 VL 17 IS 1 BP 85 EP 87 DI 10.1364/OL.17.000085 PG 3 WC Optics SC Optics GA GZ037 UT WOS:A1992GZ03700029 PM 19784238 ER PT J AU GEDRIDGE, RW BRANDSMA, L NISSAN, RA VERKRUIJSSE, HD HARDER, S DEJONG, RLP OCONNOR, CJ AF GEDRIDGE, RW BRANDSMA, L NISSAN, RA VERKRUIJSSE, HD HARDER, S DEJONG, RLP OCONNOR, CJ TI PREPARATION OF SYMMETRICAL DI-1-ALKYNYL TELLURIDES AND DIYNES BY REDUCTION OF TECL4 WITH 1-ALKYNYLLITHIUM REAGENTS SO ORGANOMETALLICS LA English DT Article ID SYNTHETIC APPLICATIONS; DIALKYL TELLURIDE AB Di-1-alkynyl tellurides ((RC = C)2Te, where R = Me, Et, n-Pr, t-Bu, Me3Si, Ph) have been prepared in 42-69% yields by the reaction of TeCl4 with 4 equiv of the corresponding 1-alkynyllithium reagents (RC = CLi). Diynes (RC = CC = CR, where R = t-Bu, Me3Si, Ph) were isolated as major byproducts from these reactions. While tetra-1-alkynyltellurium(IV) or other possible organotellurium(IV) intermediates were not isolated, it is proposed that these intermediates decompose by a reductive-elimination pathway to afford (RC = C)2Te and RC = CC = CR. These organotellurium compounds have been characterized by IR and H-1, C-13, and Te-125 NMR spectroscopies. C1 UNIV UTRECHT,DEBYE RES INST,DEPT SYNTHET ORGAN CHEM,3584 CH UTRECHT,NETHERLANDS. RP GEDRIDGE, RW (reprint author), USN,CTR WEAPONS,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. RI Institute (DINS), Debye/G-7730-2014 NR 28 TC 14 Z9 14 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JAN PY 1992 VL 11 IS 1 BP 418 EP 422 DI 10.1021/om00037a067 PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA GZ040 UT WOS:A1992GZ04000067 ER PT J AU LURIA, SM NEWACHECK, JS AF LURIA, SM NEWACHECK, JS TI THE EFFECT OF DEFOCUSING THE IMAGE ON THE PERCEPTION OF THE TEMPORAL-ORDER OF FLASHING LIGHTS SO PERCEPTION LA English DT Article ID ACUITY AB The temporal interval between flashing lights that is required to perceive nonsimultaneity decreases as the refractive error increases from 0 to +2 diopters. The interval then remains constant with further increases to 3 and 4 diopters. The results are discussed in terms of the relative increase of transient to sustained visual channels and of the increase in apparent movement. RP LURIA, SM (reprint author), USN,SUBMARINE MED RES LAB,NAVAL SUBMARINE BASE NEW LONDON,GROTON,CT 06340, USA. NR 26 TC 2 Z9 2 U1 0 U2 0 PU PION LTD PI LONDON PA 207 BRONDESBURY PARK, LONDON, ENGLAND NW2 5JN SN 0301-0066 J9 PERCEPTION JI Perception PY 1992 VL 21 IS 3 BP 359 EP 363 DI 10.1068/p210359 PG 5 WC Ophthalmology; Psychology; Psychology, Experimental SC Ophthalmology; Psychology GA JL975 UT WOS:A1992JL97500009 PM 1437455 ER PT B AU CARRUTHERS, GR SEELEY, TD DYMOND, KF AF CARRUTHERS, GR SEELEY, TD DYMOND, KF BE MORGAN, BL TI ELECTRON-BOMBARDED CCD SENSORS FOR FAR-ULTRAVIOLET MEASUREMENTS OF THE UPPER-ATMOSPHERE SO PHOTOELECTRONIC IMAGE DEVICES 1991: THE MCGEE SYMPOSIUM SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 10TH SYMP ON PHOTOELECTRONIC IMAGE DEVICES CY SEP 02-06, 1991 CL IMPERIAL COLL SCI TECHNOL & MED, LONDON, ENGLAND HO IMPERIAL COLL SCI TECHNOL & MED RP CARRUTHERS, GR (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL BN 0-85498-411-9 J9 INST PHYS CONF SER PY 1992 VL 121 BP 1 EP 8 PG 8 WC Astronomy & Astrophysics; Optics; Imaging Science & Photographic Technology SC Astronomy & Astrophysics; Optics; Imaging Science & Photographic Technology GA BV64S UT WOS:A1992BV64S00001 ER PT B AU SEELEY, TD CONWAY, RR CARRUTHERS, GR AF SEELEY, TD CONWAY, RR CARRUTHERS, GR BE MORGAN, BL TI THE MIDDLE ATMOSPHERE HIGH-RESOLUTION SPECTROGRAPH INVESTIGATION SO PHOTOELECTRONIC IMAGE DEVICES 1991: THE MCGEE SYMPOSIUM SE INSTITUTE OF PHYSICS CONFERENCE SERIES LA English DT Proceedings Paper CT 10TH SYMP ON PHOTOELECTRONIC IMAGE DEVICES CY SEP 02-06, 1991 CL IMPERIAL COLL SCI TECHNOL & MED, LONDON, ENGLAND HO IMPERIAL COLL SCI TECHNOL & MED RP SEELEY, TD (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA BRISTOL BN 0-85498-411-9 J9 INST PHYS CONF SER PY 1992 VL 121 BP 41 EP 48 PG 8 WC Astronomy & Astrophysics; Optics; Imaging Science & Photographic Technology SC Astronomy & Astrophysics; Optics; Imaging Science & Photographic Technology GA BV64S UT WOS:A1992BV64S00006 ER PT J AU NUMRICH, SK UBERALL, H AF NUMRICH, SK UBERALL, H TI SCATTERING OF SOUND PULSES AND THE RINGING OF TARGET RESONANCES SO PHYSICAL ACOUSTICS LA English DT Review ID FREQUENCY SIGNAL ANALYSIS; THIN CYLINDRICAL-SHELLS; TRANSIENT ACOUSTIC SCATTERING; SINGULARITY EXPANSION METHOD; SURFACE-WAVE INTERPRETATION; WIGNER DISTRIBUTION; SPECTRAL-ANALYSIS; FLUID CYLINDER; ELASTIC CYLINDERS; GUIDED-WAVES C1 USN,RES LAB,WASHINGTON,DC 20375. CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. NR 188 TC 17 Z9 17 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0893-388X J9 PHYS ACOUSTICS JI Phys. Acoust. PY 1992 VL 21 BP 235 EP 318 PG 84 WC Acoustics SC Acoustics GA MG658 UT WOS:A1992MG65800002 ER PT J AU DUNLAP, BI ANDZELM, J AF DUNLAP, BI ANDZELM, J TI 2ND DERIVATIVES OF THE LOCAL-DENSITY-FUNCTIONAL TOTAL ENERGY WHEN THE LOCAL POTENTIAL IS FITTED SO PHYSICAL REVIEW A LA English DT Article ID X-ALPHA METHOD; LINEAR COMBINATION; ORBITALS; CHEMISORPTION; OPTIMIZATION; GEOMETRIES; AL(111); FORCES AB Second derivatives of the total energy with respect to nuclear coordinates and self-consistent-field parameters within the linear-combination-of-atomic-orbitals approach to local-density-functional theory are discussed. We explicitly include the effects of the fitting procedures for both the electrostatic and the exchange-correlation energies of the electrons in the evaluation of derivative expressions by solving for the fitting coefficients in the appropriate Lagrangian before any differentiation. The advantages and disadvantages of fitting vis-a-vis accurate three-dimensional numerical integration are discussed. C1 CRAY RES INC,EAGAN,MN 55121. RP DUNLAP, BI (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6179,WASHINGTON,DC 20375, USA. OI Dunlap, Brett/0000-0003-1356-6559 NR 34 TC 37 Z9 37 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JAN 1 PY 1992 VL 45 IS 1 BP 81 EP 87 DI 10.1103/PhysRevA.45.81 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GY518 UT WOS:A1992GY51800015 ER PT J AU REIMANN, CT BROWN, WL GROSJEAN, DE NOWAKOWSKI, MJ AF REIMANN, CT BROWN, WL GROSJEAN, DE NOWAKOWSKI, MJ TI DIMER DESORPTION FROM SOLID ARGON FILMS ELECTRONICALLY EXCITED BY MEV HE IONS SO PHYSICAL REVIEW B LA English DT Article ID RARE-GAS SOLIDS; SURFACE-SENSITIVE LUMINESCENCE; ULTRAVIOLET-LASER SPECTROSCOPY; RADIATIVE LIFETIMES; STIMULATED DESORPTION; VACUUM ULTRAVIOLET; INTERNUCLEAR DISTANCE; ROVIBRONIC SPECTRA; ENERGY TRANSFER; ATOMIC EXCITON AB Electronic excitation of solid Ar films by MeV He+ ions gives rise to broad luminescence bands centered at 1110 and 1265 angstrom. We have examined the spatial and temporal characteristics of these dimer luminescence bands. Observing all the luminescence, we measure a spectrum that is dominated by the 1265-angstrom band. This band is from decay of vibrationally relaxed Ar2*(1,3-SIGMA(u)+) trapped in the bulk of the Ar film. Observing only the luminescence from a plume of desorbed particles in front of the excited Ar film, we observe a long-lived 1110-angstrom luminescence band with a long-wavelength tail extending down to the region around 1265 angstrom. This band is from decay of gas-phase Ar2*(3-SIGMA(u)+; 1u, 0u-) in various degrees of vibrational relaxation. The Ar2* ejection kinetic energy (KE), as well as the degree of vibrational relaxation, are important clues to the mechanisms of dimer formation and desorption. We observe a delayed onset of the luminescence under pulsed excitation if the base of the luminescent plume is hidden from view. The average delayed onset time is a time of flight, the value of which indicates that the average KE of the desorbed Ar2* is 0.1 eV but ranges as low as 0.06 eV for dimers in highly vibrationally excited states. The temporal width of the delayed onset is consistent with a hemispherical plume shape. We have fitted the observed 1110-angstrom luminescence band with a linear combination of quantum mechanically calculated luminescence spectra of the vibrational levels of Ar2*(3-SIGMA(u)+; 1u, 0u-). The resulting vibrational-state distribution is non-Boltzmann and increases sharply with decreasing vibrational quantum number, indicating a considerable degree of vibrational relaxation. These results are discussed in terms of simple models of the Ar2*-desorption process. We hypothesize that Ar2* is ejected with a KE around 0.1 eV after dissociative recombination of an electron with a near-surface self-trapped hole, Ar2+, and subsequent dimerization of the energetic Ar*. Many-body collisions occurring during dimerization effectively relax the vibrational state of the dimer. C1 USN,RES LAB,WASHINGTON,DC 20375. AT&T BELL LABS,MURRAY HILL,NJ 07901. UNIV VIRGINIA,DEPT NUCL ENGN & ENGN PHYS,CHARLOTTESVILLE,VA 22901. NR 50 TC 33 Z9 33 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 JAN 1 PY 1992 VL 45 IS 1 BP 43 EP 55 DI 10.1103/PhysRevB.45.43 PG 13 WC Physics, Condensed Matter SC Physics GA GY516 UT WOS:A1992GY51600006 ER PT J AU FUSINA, R KIMBALL, JC AF FUSINA, R KIMBALL, JC TI RESONANT EXCITATIONS OF IONS CHANNELED IN QUASI-CRYSTAL STRUCTURES SO PHYSICAL REVIEW B LA English DT Note AB The resonant excitation of channeling ions is proposed as a method to measure the periodicity and structure of quasicrystals. In principle, such an experiment could provide information about quasicrystal lattice structures because the channeling ion probes only special parts of the crystal. C1 SUNY ALBANY,DEPT PHYS,ALBANY,NY 12222. RP FUSINA, R (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,CODE 4694,WASHINGTON,DC 20375, USA. NR 8 TC 0 Z9 0 U1 0 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 JAN 1 PY 1992 VL 45 IS 1 BP 448 EP 450 DI 10.1103/PhysRevB.45.448 PG 3 WC Physics, Condensed Matter SC Physics GA GY516 UT WOS:A1992GY51600053 ER PT J AU COHN, JL WOLF, SA VANDERAH, TA AF COHN, JL WOLF, SA VANDERAH, TA TI EVIDENCE FOR STRONG ELECTRON-PHONON COUPLING IN THE THERMAL-CONDUCTIVITY OF YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS AB We have measured the ab-plane thermal conductivity (kappa) on single-crystal YBa2Cu3O7-delta (delta almost-equal-to 0.08) in the temperature range 10 less-than-or-equal-to T less-than-or-equal-to 300 K. Our main focus is an analysis of the slope change in kappa(T), which occurs just below the superconducting transition. The reduced-temperature (t = T/T(c)) derivative of the normalized thermal conductivity, -d(kappa(s)/kappa(n))/dt\t = 1, as determined from the data, is rather small, less-than-or-equal-to 1.1. From measurements of the electrical conductivity on the same specimens and application of the Wiedemann-Franz law, we determine the relative contributions to the heat conduction from the carriers and the lattice, and discuss the normal-state phonon-scattering mechanisms. Employing these results we calculate the slope of the lattice thermal conductivity at T(c) and infer that the slope of the carrier conductivity must by very large, greater-than-or-equal-to 6. This result implies strong coupling for some of the carriers. C1 USN,CTR WEAP,CHINA LAKE,CA 90124. RP COHN, JL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 28 TC 38 Z9 38 U1 1 U2 8 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 JAN 1 PY 1992 VL 45 IS 1 BP 511 EP 514 DI 10.1103/PhysRevB.45.511 PG 4 WC Physics, Condensed Matter SC Physics GA GY516 UT WOS:A1992GY51600073 ER PT J AU SWANDIC, JR AF SWANDIC, JR TI STOCHASTIC APPROACH TO RECOMBINATION LUMINESCENCE WITH RETRAPPING IN THE STEADY-STATE SO PHYSICAL REVIEW B LA English DT Article AB Due to the discrete nature of electrons and holes, fluctuations will occur in various particle densities associated with thermally stimulated luminescence. The master equation for a simple stochastic model with one trapping level and one recombination level is derived. An expansion of this equation by van Kampen's OMEGA-expansion method allows one to recover the usual deterministic macroscopic kinetic equations as well as to obtain the Fokker-Planck equation governing the fluctuations of the various particle numbers. A set of evolution equations for the two lowest moments of the fluctuations is then found; since the solution of the Fokker-Planck equation is a multivariate Gaussian distribution, this completely determines the statistics of the fluctuations to this order of the OMEGA-expansion. In the steady state, one can obtain expressions for the macroscopic particle densities that are of fairly simple form in the weak-source limit. Similarly, one can find and solve in this limit the algebraic equations for the second moments and the kinetic equations for the first moments of the fluctuations. From these, one derives explicit forms for the correlation functions, in particular, for the luminescence autocorrelation function, which is a sum of exponential decays. From measurements of the autocorrelation function of a luminescent material, one can deduce the model parameters. RP USN, CTR SURFACE WARFARE, CODE R41, SILVER SPRING, MD 20903 USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD JAN 1 PY 1992 VL 45 IS 2 BP 622 EP 634 DI 10.1103/PhysRevB.45.622 PG 13 WC Physics, Condensed Matter SC Physics GA HA074 UT WOS:A1992HA07400009 ER PT J AU ZANG, TA DAHLBURG, RB DAHLBURG, JP AF ZANG, TA DAHLBURG, RB DAHLBURG, JP TI DIRECT AND LARGE-EDDY SIMULATIONS OF 3-DIMENSIONAL COMPRESSIBLE NAVIER-STOKES TURBULENCE SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID NUMERICAL-SIMULATION; SHEAR FLOWS AB This paper reports results from the numerical implementation and testing of the compressible large-eddy simulation (LES) model described by Speziale et al. [Phys. Fluids 31, 940 (1988)] and Erlebacher et al. (to appear in J. Fluid Mech.). Relevant quantities from 32(3) "coarse grid" LES solutions are compared with results generated from 96(3) direct numerical simulations (DNS) of three-dimensional compressible turbulence. It is found that the 32(3) LES results overall agree well with their 96(3) DNS counterparts. Moreover, the new DNS results confirm several recent conclusions about compressible turbulence that have been based primarily on two-dimensional simulations. C1 USN, RES LAB, COMPUTAT PHYS & FLUID DYNAM LAB, WASHINGTON, DC 20375 USA. RP ZANG, TA (reprint author), NASA, LANGLEY RES CTR, THEORET FLOW PHYS BRANCH, HAMPTON, VA 23665 USA. NR 28 TC 53 Z9 56 U1 2 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD JAN PY 1992 VL 4 IS 1 BP 127 EP 140 DI 10.1063/1.858491 PG 14 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA GX510 UT WOS:A1992GX51000014 ER PT J AU GROSSMANN, JM SWANEKAMP, SB OTTINGER, PF AF GROSSMANN, JM SWANEKAMP, SB OTTINGER, PF TI MODELING OF DYNAMIC BIPOLAR PLASMA SHEATHS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EROSION OPENING SWITCH; DIODE AB The behavior of a one-dimensional plasma sheath is described in regimes where the sheath is not in equilibrium because it carries current densities that are either time dependent, or larger than the bipolar Child-Langmuir level determined from the injected ion flux. Earlier models of dynamic bipolar sheaths assumed that ions and electrons evolve in a series of quasiequilibria. In addition, sheath growth was described by the equation Zen0x(s) = \j(i)\ - Zen0u0, where x(s) is the velocity of the sheath edge, j(i) is the ion current density, n0u0 is the injected ion flux density, and Ze is the ion charge. In this paper, a generalization of the bipolar electron-to-ion current density ratio formula is derived to study regimes where ions are not in equilibrium. A generalization of the above sheath growth equation is also developed, which is consistent with the ion continuity equation and which reveals new physics of sheath behavior associated with the emitted electrons and their evolution. Based on these findings, two new models of dynamic bipolar sheaths are developed. Larger sheath sizes and potentials than those of earlier models are found. In certain regimes, explosive sheath growth is predicted. RP GROSSMANN, JM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 16 Z9 16 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JAN PY 1992 VL 4 IS 1 BP 44 EP 55 DI 10.1063/1.860454 PG 12 WC Physics, Fluids & Plasmas SC Physics GA GX513 UT WOS:A1992GX51300008 ER PT J AU DOYLE, R AF DOYLE, R TI RECONCILABLE DIFFERENCES - CONGRESS, THE BUDGET PROCESS, AND THE DEFICIT - GILMOUR,J SO POLICY STUDIES JOURNAL LA English DT Book Review RP DOYLE, R (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU POLICY STUDIES ORGANIZATION PI URBANA PA UNIV ILLINOIS 361 LINCOLN HALL, URBANA, IL 61801 SN 0190-292X J9 POLICY STUD J JI Policy Stud. J. PY 1992 VL 20 IS 3 BP 489 EP 498 DI 10.1111/j.1541-0072.1992.tb00175.x PG 10 WC Political Science; Public Administration SC Government & Law; Public Administration GA JG417 UT WOS:A1992JG41700015 ER PT J AU BALIZER, E DUFFY, JV AF BALIZER, E DUFFY, JV TI THE EFFECT OF STERIC HINDRANCE ON SUB-GLASS TRANSITIONS IN EPOXY POLYMERS SO POLYMER LA English DT Article DE DIGLYCIDYL ETHER OF BISPHENOL-A; STERIC HINDRANCE; DIAMINES; SUB-GLASS TRANSITION; HAVRILIAK-NEGAMI DISPERSION; HYSTERESIS DISPERSION ID MECHANICAL RELAXATION; RESINS; CURE AB Pairs of sterically hindered and unhindered linear aliphatic and aromatic diamines were synthesized and used as curatives for the diglycidyl ether of bisphenol A (DGEBA). The steric hindrance was caused by methyl group substitution of a hydrogen atom adjacent to the amine. For each pair, the hindered diamine cure had a lower density and a higher glass transition. Another pair of diamines was synthesized for which the methyl group was replaced by ethyl and butyl side chains; for these resins, both the density and glass transition decreased. Torsional pendulum results show that the sub-glass transition for the hindered cures shifts to lower temperatures and has a greater activation energy. Analysis by the Havriliak-Negami dispersion equation shows that the hindered resins have broader and more symmetrical relaxations. The background hysteresis loss outside of the relaxation region was analysed by the Nutting equation and was found to decrease with steric hindrance. RP BALIZER, E (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 25 TC 1 Z9 1 U1 2 U2 4 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0032-3861 J9 POLYMER JI Polymer PY 1992 VL 33 IS 10 BP 2114 EP 2122 DI 10.1016/0032-3861(92)90877-Y PG 9 WC Polymer Science SC Polymer Science GA HW559 UT WOS:A1992HW55900012 ER PT J AU ZEMEL, IS ROLAND, CM AF ZEMEL, IS ROLAND, CM TI ANOMALIES IN THE CRYSTALLIZATION OF CIS-1,4-POLYISOPRENE IN BLENDS WITH POLY(VINYLETHYLENE) SO POLYMER LA English DT Article DE CRYSTALLIZATION; BLENDS; POLYISOPRENE; POLY(VINYLETHYLENE); DIFFERENTIAL SCANNING CALORIMETRY; FOURIER-TRANSFORM INFRARED SPECTROSCOPY ID DIFFERENTIAL SCANNING CALORIMETRY; CRYSTAL AMORPHOUS INTERPHASE; POLY(VINYLIDENE FLUORIDE); POLY(METHYL METHACRYLATE); CIS-POLYISOPRENE; POLYMERS; TRANSITIONS; KINETICS; NETWORKS; POLYCARBONATE AB The crystallization of cis- 1,4-polyisoprene (PIP) in miscible blends with atactic poly (vinylethylene) (PVE) was investigated. Normalized to the PIP content, the extent of crystallization and the crystallization-rate were suppressed in the mixtures. A reduction in the degree of crystallinity is contrary to the behaviour usually exhibited by blends in the absence of crosslinking. More anomalous was the observation that the magnitude of the crystallization suppression in the uncrosslinked PIP was independent of PVE concentration over a range from 5 to 50% PVE. Furthermore, whereas alpha-lamellae predominate for pure PIP crystallization, blending with high-molecular-weight PVE caused preferential development of the beta-lamellar form. This bias may be a reflection of the known ability of the beta-lamellae to incorporate non-crystallizing entities more readily into the fold plane at the crystal surface. Changes in heat capacity at T(g) measured before and after melting were consistent with the notion that PVE chains are trapped between the lamellae of the crystallizing PIP, with the extent of entrapment substantially greater for higher-molecular-weight PVE. The degree of crystallinity in the blends also varied with the molecular weight of the PVE, suggesting that suppression of the crystallization was a consequence of the entrapment of the PVE. In networks the suppression of crystallization significantly exceeded that observed in uncrosslinked blends and pure PIP networks. For free-radical crosslinking the presence of PVE increases the crosslink density of the PIP segments, contributing to the lower crystallinity in the crosslinked mixtures. C1 USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375. NR 53 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0032-3861 J9 POLYMER JI Polymer PY 1992 VL 33 IS 16 BP 3427 EP 3432 DI 10.1016/0032-3861(92)91100-G PG 6 WC Polymer Science SC Polymer Science GA JJ081 UT WOS:A1992JJ08100012 ER PT J AU ZEMEL, IS ROLAND, CM AF ZEMEL, IS ROLAND, CM TI ORIENTATIONAL CORRELATIONS IN POLYISOPRENE POLY(VINYLETHYLENE) MIXTURES SO POLYMER LA English DT Article DE ORIENTATION; CIS-1,4-POLYISOPRENE; POLY(VINYLETHYLENE); NETWORKS ID MISCIBLE POLYMER BLEND; TIME TEMPERATURE SUPERPOSITION; RUBBER ELASTICITY; MAGNETIC-RESONANCE; INFRARED DICHROISM; MOLECULAR THEORY; NETWORKS; RELAXATION; CHAINS; ANISOTROPY AB I.r. dichroism measurements were used to study the orientation in stretched networks of cis-1,4-polyisoprene (PIP) containing atactic poly(vinylethylene) (PVE). When both components are part of a network, their relaxation behaviour and equilibrium orientation are essentially identical. In blends of crosslinked PIP with linear PVE, the orientation of the latter is reduced relative to that of the former; however, the PVE retains an equilibrium orientation by virtue of its presence in the strained network. Consistent with earlier results on isotropic crystallization of PIP in this blend, strain induced crystallization evidently entraps some of the amorphous PVE when it is high in molecular weight, thus enhancing the extent of orientational coupling. In amorphous networks, the coupling is dependent on the degree to which the PVE chains can be accommodated within the network mesh; hence, coupling is enhanced for lower molecular weight PVE in less crosslinked PIP. The addition of diluent weakens the coupling in a manner consistent with the excluded volume origin of the interchain interactions. C1 USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375. NR 46 TC 7 Z9 7 U1 1 U2 3 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0032-3861 J9 POLYMER JI Polymer PY 1992 VL 33 IS 21 BP 4522 EP 4526 DI 10.1016/0032-3861(92)90408-O PG 5 WC Polymer Science SC Polymer Science GA JX127 UT WOS:A1992JX12700011 ER PT S AU KLEIN, PB MOORE, FG DIETRICH, HB AF KLEIN, PB MOORE, FG DIETRICH, HB BE Davies, G Deleo, GG Stavola, M TI SPECTROSCOPIC INVESTIGATION OF THE ER SITE IN GAASER SO PROCEEDINGS OF THE 16TH INTERNATIONAL CONFERENCE ON DEFECTS IN SEMICONDUCTORS, PTS 1-3 SE Materials Science Forum LA English DT Proceedings Paper CT 16TH INTERNATIONAL CONF ON DEFECTS IN SEMICONDUCTORS ( ICDS-16 ) CY JUL 22-26, 1991 CL LEHIGH UNIV, BETHLEHEM, PA SP USAF, OFF SCI RES, BANDGAP TECHNOL, DEF ADV RES PROJECTS AGCY, EASTMAN KODAK, FORD MOTOR, FUJITSU LABS, IBM, KAWASAKI STEEL, LEHIGH UNIV, MOBIL SOLAR ENERGY HO LEHIGH UNIV C1 USN, RES LAB, WASHINGTON, DC 20375 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU TRANS TECH PUBLICATIONS LTD PI STAFA-ZURICH PA LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND SN 0255-5476 BN 0-87849-628-9 J9 MATER SCI FORUM PY 1992 VL 83 BP 665 EP 670 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA BW69F UT WOS:A1992BW69F00104 ER PT S AU GLASER, ER KENNEDY, TA AF GLASER, ER KENNEDY, TA BE Davies, G Deleo, GG Stavola, M TI OPTICALLY-DETECTED MAGNETIC-RESONANCE OF DONOR STATES IN ALXGA1-XAS(X-GREATER-THAN-OR-EQUAL-TO-0.35) DOPED WITH GROUP-IV AND GROUP-VI IMPURITIES SO PROCEEDINGS OF THE 16TH INTERNATIONAL CONFERENCE ON DEFECTS IN SEMICONDUCTORS, PTS 1-3 SE Materials Science Forum LA English DT Proceedings Paper CT 16TH INTERNATIONAL CONF ON DEFECTS IN SEMICONDUCTORS ( ICDS-16 ) CY JUL 22-26, 1991 CL LEHIGH UNIV, BETHLEHEM, PA SP USAF, OFF SCI RES, BANDGAP TECHNOL, DEF ADV RES PROJECTS AGCY, EASTMAN KODAK, FORD MOTOR, FUJITSU LABS, IBM, KAWASAKI STEEL, LEHIGH UNIV, MOBIL SOLAR ENERGY HO LEHIGH UNIV C1 USN, RES LAB, WASHINGTON, DC 20375 USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU TRANS TECH PUBLICATIONS LTD PI STAFA-ZURICH PA LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND SN 0255-5476 BN 0-87849-628-9 J9 MATER SCI FORUM PY 1992 VL 83 BP 775 EP 786 PG 12 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA BW69F UT WOS:A1992BW69F00121 ER PT S AU ZVANUT, ME CARLOS, WE TWIGG, ME STAHLBUSH, RE GODBEY, DJ AF ZVANUT, ME CARLOS, WE TWIGG, ME STAHLBUSH, RE GODBEY, DJ BE Davies, G Deleo, GG Stavola, M TI OBSERVATION OF A TRIVALENT GE DEFECT IN OXYGEN IMPLANTED SIGE ALLOYS SO PROCEEDINGS OF THE 16TH INTERNATIONAL CONFERENCE ON DEFECTS IN SEMICONDUCTORS, PTS 1-3 SE Materials Science Forum LA English DT Proceedings Paper CT 16TH INTERNATIONAL CONF ON DEFECTS IN SEMICONDUCTORS ( ICDS-16 ) CY JUL 22-26, 1991 CL LEHIGH UNIV, BETHLEHEM, PA SP USAF, OFF SCI RES, BANDGAP TECHNOL, DEF ADV RES PROJECTS AGCY, EASTMAN KODAK, FORD MOTOR, FUJITSU LABS, IBM, KAWASAKI STEEL, LEHIGH UNIV, MOBIL SOLAR ENERGY HO LEHIGH UNIV C1 USN, RES LAB, WASHINGTON, DC 20375 USA. NR 0 TC 8 Z9 8 U1 0 U2 0 PU TRANS TECH PUBLICATIONS LTD PI STAFA-ZURICH PA LAUBLSRUTISTR 24, CH-8717 STAFA-ZURICH, SWITZERLAND SN 0255-5476 BN 0-87849-628-9 J9 MATER SCI FORUM PY 1992 VL 83 BP 1493 EP 1498 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA BW69F UT WOS:A1992BW69F00230 ER PT S AU SHUKLA, S LITTLE, B ZAKY, A AF SHUKLA, S LITTLE, B ZAKY, A BE Shin, KG TI A COMPILE-TIME TECHNIQUE FOR CONTROLLING REAL-TIME EXECUTION OF TASK-LEVEL DATA-FLOW GRAPHS SO PROCEEDINGS OF THE 1992 INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING, VOL II - SOFTWARE SE PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PARALLEL PROCESSING LA English DT Proceedings Paper CT 1992 International Conference on Parallel Processing CY AUG 17-21, 1992 CL UNIV MICHIGAN, ANN ARBOR, MI SP PENN STATE UNIV HO UNIV MICHIGAN C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CRC PRESS INC PI BOCA RATON PA 2000 CORPORATE BLVD NW, BOCA RATON, FL 33431 SN 0190-3918 BN 0-8493-0782-1 J9 PROC INT CONF PARAL PY 1992 BP 49 EP 56 PG 8 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA51S UT WOS:A1992BA51S00008 ER PT J AU AZAD, AF SACCI, JB NELSON, WM DASCH, GA SCHMIDTMANN, ET CARL, M AF AZAD, AF SACCI, JB NELSON, WM DASCH, GA SCHMIDTMANN, ET CARL, M TI GENETIC-CHARACTERIZATION AND TRANSOVARIAL TRANSMISSION OF A TYPHUS-LIKE RICKETTSIA FOUND IN CAT FLEAS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID POLYMERASE CHAIN-REACTION; MURINE TYPHUS; INFECTION; DNA; IDENTIFICATION AB The identification of apparently fastidious microorganisms is often problematic. DNA from a rickettsia-like agent (called the ELB agent) present in cat fleas could be amplified by PCR with conserved primers derived from rickettsial 17-kDa common protein antigen and citrate synthase genes but not spotted fever group 190-kDa antigen gene. Alu I sites in both the 17-kDa and citrate synthase PCR products obtained with the rickettsia-like agent and Rickettsia typhi were different even though both agents reacted with monoclonal antibodies previously thought specific for R. typhi. The DNA sequence of a portion of the 17-kDa PCR product of the rickettsia-like agent differed significantly from all known rickettsial sequences and resembled the 17-kDa sequences of typhus more than spotted fever group rickettsiae. The rare stable transovarial maintenance of this rickettsia in cat fleas has important implications for the disease potential of cat fleas. C1 USN,DEPT IMMUNOL TRANSPLANTAT,BETHESDA,MD 20889. USN,MED RES INST,RICKETTSIAL DIS PROGRAM,BETHESDA,MD 20889. USDA ARS,BELTSVILLE AGR RES CTR,BELTSVILLE,MD 20705. RP AZAD, AF (reprint author), UNIV MARYLAND,SCH MED,DEPT MICROBIOL & IMMUNOL,BALTIMORE,MD 21201, USA. FU NIAID NIH HHS [AI 17828] NR 25 TC 105 Z9 109 U1 0 U2 5 PU NATL ACAD PRESS 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 JAN 1 PY 1992 VL 89 IS 1 BP 43 EP 46 DI 10.1073/pnas.89.1.43 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GY047 UT WOS:A1992GY04700010 PM 1729713 ER PT J AU WINCHESTER, CS BARNES, JA DAVIS, PB FREEMAN, WA SUTULA, RA AF WINCHESTER, CS BARNES, JA DAVIS, PB FREEMAN, WA SUTULA, RA GP CALIF STATE UNIV TI PROSPECTS FOR THE USE OF LITHIUM BATTERIES BY THE NAVY SO PROCEEDINGS OF THE SEVENTH ANNUAL BATTERY CONFERENCE ON APPLICATIONS AND ADVANCES LA English DT Proceedings Paper CT 7th Annual Battery Conference on Applications and Advances CY JAN 21-23, 1992 CL LONG BEACH, CA SP CALIF STATE UNIV LONG BEACH, DEPT ELECT ENGN C1 USN,CTR SURFACE WARFARE,ELECTROCHEM BRANCH,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CALIFORNIA STATE UNIV CONSORTIUM PI LONG BEACH PA 1250 BELLFLOWER BLVD, LONG BEACH, CA 90840 PY 1992 BP 9 EP 16 PG 8 WC Electrochemistry; Engineering, Electrical & Electronic SC Electrochemistry; Engineering GA BZ58H UT WOS:A1992BZ58H00002 ER PT J AU LEWIS, HL HAMMERSLEY, LH AF LEWIS, HL HAMMERSLEY, LH GP CALIF STATE UNIV TI MATERIALS SCIENCES CHARACTERIZATION OF A THERMAL BATTERY SO PROCEEDINGS OF THE SEVENTH ANNUAL BATTERY CONFERENCE ON APPLICATIONS AND ADVANCES LA English DT Proceedings Paper CT 7th Annual Battery Conference on Applications and Advances CY JAN 21-23, 1992 CL LONG BEACH, CA SP CALIF STATE UNIV LONG BEACH, DEPT ELECT ENGN C1 USN,WEAP SUPPORT CTR CRANE,WASHINGTON,DC 20350. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CALIFORNIA STATE UNIV CONSORTIUM PI LONG BEACH PA 1250 BELLFLOWER BLVD, LONG BEACH, CA 90840 PY 1992 BP 161 EP 169 PG 9 WC Electrochemistry; Engineering, Electrical & Electronic SC Electrochemistry; Engineering GA BZ58H UT WOS:A1992BZ58H00016 ER PT J AU SCHADOW, KC GUTMARK, E AF SCHADOW, KC GUTMARK, E TI COMBUSTION INSTABILITY RELATED TO VORTEX SHEDDING IN DUMP COMBUSTORS AND THEIR PASSIVE CONTROL SO PROGRESS IN ENERGY AND COMBUSTION SCIENCE LA English DT Review ID DYNAMICS; JET; LAYERS; FLOW AB This review summarizes recent research program related to the driving mechanism of dump combustor instability. Its scope includes experimental research in dump combustors using gaseous fuel. The emphasis here is on vortex shedding as a driving mechanism of combustion instabilities. It is shown that the development of coherent flow structures and their breakdown into fine-scale turbulence can lead to periodic heat release, which, when in phase with the pressure oscillation, can drive the oscillations as stated by the Rayleigh criterion. The physical processes associated with the vortex breakdown are described. This understanding is used to passively control and reduce the pressure oscillations, as demonstrated for dump and bluff body stabilized combustion flows. RP SCHADOW, KC (reprint author), USN,CTR WEAPONS,CHINA LAKE,CA 93555, USA. OI Gutmark, Ephraim/0000-0001-7816-4257 NR 44 TC 160 Z9 163 U1 8 U2 24 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-1285 J9 PROG ENERG COMBUST JI Prog. Energy Combust. Sci. PY 1992 VL 18 IS 2 BP 117 EP 132 DI 10.1016/0360-1285(92)90020-2 PG 16 WC Thermodynamics; Energy & Fuels; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA HG360 UT WOS:A1992HG36000002 ER PT J AU SESTERHENN, IA MOSTOFI, FK MATTREY, RR SANDS, JP DAVIS, CJ MCCARTHY, WF AF SESTERHENN, IA MOSTOFI, FK MATTREY, RR SANDS, JP DAVIS, CJ MCCARTHY, WF TI PRELIMINARY-RESULTS OF 3-DIMENSIONAL RECONSTRUCTION OF PREVIOUSLY IMAGED PROSTATES SO PROSTATE LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL CONGRESS OF THE DUTCH UROLOGICAL ASSOC : PROSTATE CANCER - IMAGING, MANAGEMENT, AND SCREENING CY OCT 09-13, 1991 CL ROTTERDAM, NETHERLANDS SP DUTCH UROLOG ASSOC, ICI PHARM ID CANCER AB In patients with biopsy proven prostate cancer, preoperative transrectal magnetic resonance imaging (MRI) and ultrasound were performed, followed by total prostatectomy. Generally, the findings with MRI correlated well with the histopathologic findings, including infiltration of and extension through the capsule into periprostatic tissue and the seminal vesicles. False negative results with MRI included centrally located tumors and small tumors. False positive results with MRI included lobular atrophy, cystic hyperplasia, cystic atrophy, florid glandular hyperplasia and scars with chronic inflammation. C1 USAF,INST PATHOL,DEPT BIOSTAT,WASHINGTON,DC 20306. USAF,INST PATHOL,DEPT EPIDEMIOL,WASHINGTON,DC 20306. UNIV SO CALIF,DEPT RADIOL,SAN DIEGO,CA. USN HOSP,DEPT UROL,SAN DIEGO,CA 92134. RP SESTERHENN, IA (reprint author), USAF,INST PATHOL,DEPT GENITOURINARY PATHOL,WASHINGTON,DC 20306, USA. NR 15 TC 2 Z9 2 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 0270-4137 J9 PROSTATE JI Prostate PY 1992 SU 4 BP 33 EP 41 PG 9 WC Endocrinology & Metabolism; Urology & Nephrology SC Endocrinology & Metabolism; Urology & Nephrology GA HU822 UT WOS:A1992HU82200005 ER PT J AU ACTON, LW FELDMAN, U BRUNER, ME DOSCHEK, GA HIRAYAMA, T HUDSON, HS LEMEN, JR OGAWARA, Y STRONG, KT TSUNETA, S AF ACTON, LW FELDMAN, U BRUNER, ME DOSCHEK, GA HIRAYAMA, T HUDSON, HS LEMEN, JR OGAWARA, Y STRONG, KT TSUNETA, S TI THE MORPHOLOGY OF 20X10(6) K PLASMA IN LARGE NONIMPULSIVE SOLAR-FLARES SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN LA English DT Letter DE SUN-FLARES; SUN-X-RAYS; MAGNETOHYDRODYNAMICS ID JUNE 15 AB We have examined images of 10 flares observed by the Soft X-ray Telescope on-board the Yohkoh spacecraft. These images show that the hottest portion of the soft X-ray flare is located in compact regions that appear to be situated at the tops of loops. These compact regions form at, or shortly after, flare onset, and persist well into the decay phase of the flares. In some cases, the compact regions are only a few thousand kilometers in size and are small compared to the lengths of flaring loops. This is inconsistent with the smoother intensity distribution along the loops expected from models of chromospheric evaporation. C1 USN,RES LAB,WASHINGTON,DC 20375. NATL ASTRON OBSERV,MITAKA,TOKYO 181,JAPAN. UNIV HAWAII,INST ASTRON,HONOLULU,HI 96822. INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN. UNIV TOKYO,INST ASTRON,MITAKA,TOKYO 181,JAPAN. RP ACTON, LW (reprint author), LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304, USA. NR 19 TC 81 Z9 81 U1 0 U2 0 PU ASTRONOMICAL SOC JAPAN PI TOKYO PA C/O NATIONAL ASTRONOM OBSERV MITAKA-SHI, TOKYO 181, JAPAN SN 0004-6264 J9 PUBL ASTRON SOC JPN JI Publ. Astron. Soc. Jpn. PY 1992 VL 44 IS 5 BP L71 EP L75 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KB945 UT WOS:A1992KB94500006 ER PT J AU CULHANE, JL FLUDRA, A BENTLEY, RD DOSCHEK, GA WATANABE, T HIEI, E LANG, J CARTER, MK MARISKA, JT PHILLIPS, AT PHILLIPS, KJH PIKE, CD STERLING, AC AF CULHANE, JL FLUDRA, A BENTLEY, RD DOSCHEK, GA WATANABE, T HIEI, E LANG, J CARTER, MK MARISKA, JT PHILLIPS, AT PHILLIPS, KJH PIKE, CD STERLING, AC TI OBSERVATIONS OF SEVERAL SMALL FLARES WITH THE BRAGG CRYSTAL SPECTROMETER ON YOHKOH SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN LA English DT Letter DE PLASMA MOTIONS; SUN-FLARES; SUN-X-RAYS; X-RAYS-SPECTRA ID DIELECTRONIC SATELLITE SPECTRA; HELIUM-LIKE IONS; X-RAY-SPECTRA; SOLAR-FLARES; SMM OBSERVATIONS; FLARING LOOPS; INNER-SHELL; CALCIUM; RATIOS; IRON AB We have analysed data from two flares of GOES class C7.1 and C8.5 observed by the Yohkoh Bragg Crystal Spectrometer. The high sensitivity of the Yohkoh instrument allows us to observe the very early stages of flare development and to study small events with a high signal-to-noise ratio. Spectral fitting programs have been used to derive plasma temperatures, emission measures and velocities from spectra of S XV, Ca XIX and Fe XXV. Large plasma motions indicative of chromospheric evaporation have been found. A more detailed analysis of a flare which occurred on 1991 October 30 is presented. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. COMPUTAT PHYS INC, FAIRFAX, VA 22031 USA. RP CULHANE, JL (reprint author), UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, ENGLAND. NR 14 TC 18 Z9 18 U1 0 U2 0 PU ASTRONOMICAL SOC JAPAN PI TOKYO PA C/O NATIONAL ASTRONOMICAL OBSERVATORY, 2-21-1 OSAWA, MITAKA-SHI, TOKYO, 181-8588, JAPAN SN 0004-6264 J9 PUBL ASTRON SOC JPN JI Publ. Astron. Soc. Jpn. PY 1992 VL 44 IS 5 BP L101 EP L106 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KB945 UT WOS:A1992KB94500011 ER PT J AU DOSCHEK, GA MARISKA, JT WATANABE, T HIEI, E LANG, J CULHANE, JL BENTLEY, RD BROWN, CM FELDMAN, U PHILLIPS, AT PHILLIPS, KJH STERLING, AC AF DOSCHEK, GA MARISKA, JT WATANABE, T HIEI, E LANG, J CULHANE, JL BENTLEY, RD BROWN, CM FELDMAN, U PHILLIPS, AT PHILLIPS, KJH STERLING, AC TI YOHKOH BRAGG CRYSTAL SPECTROMETER OBSERVATIONS OF THE DYNAMICS AND TEMPERATURE BEHAVIOR OF A SOFT-X-RAY FLARE SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN LA English DT Letter DE SUN-FLARES; SUN-X-RAYS; X-RAY SPECTROSCOPY ID DIELECTRONIC SATELLITE SPECTRA; HEATED SOLAR-FLARES; HELIUM-LIKE IONS; IMPULSIVE PHASE; INNER-SHELL; EMISSION; CALCIUM; IRON AB We describe X-ray spectra of an M1.5 flare that occurred on 1991 November 9, starting at about 0313 UT. This flare is unusual in that very intense blueshifted components are observed in the resonance lines of Fe XXV, Ca XIX, and S XV. During the onset of the flare, the resonance lines of Ca XIX and Fe XXV are primarily due to this blueshifted component, which from the Doppler effect indicates line-of-sight speeds and turbulent motions that in combination extend up to 800 km s-1. C1 NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, ENGLAND. COMPUTAT PHYS INC, FAIRFAX, VA 22031 USA. RP DOSCHEK, GA (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 19 TC 20 Z9 20 U1 0 U2 0 PU ASTRONOMICAL SOC JAPAN PI TOKYO PA C/O NATIONAL ASTRONOMICAL OBSERVATORY, 2-21-1 OSAWA, MITAKA-SHI, TOKYO, 181-8588, JAPAN SN 0004-6264 J9 PUBL ASTRON SOC JPN JI Publ. Astron. Soc. Jpn. PY 1992 VL 44 IS 5 BP L95 EP L99 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KB945 UT WOS:A1992KB94500010 ER PT J AU KLIMCHUK, JA LEMEN, JR FELDMAN, U TSUNETA, S UCHIDA, Y AF KLIMCHUK, JA LEMEN, JR FELDMAN, U TSUNETA, S UCHIDA, Y TI THICKNESS VARIATIONS ALONG CORONAL LOOPS OBSERVED BY THE SOFT-X-RAY TELESCOPE ON YOHKOH SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN LA English DT Letter DE MAGNETOHYDRODYNAMICS; SUN-CORONA; SUN-MAGNETIC FIELDS; SUN-X-RAYS ID MAGNETIC-FIELDS; SOLAR CORONA AB It has been suggested that observed coronal loops have constant thicknesses. However, if plasma loops coincide with magnetic loops, then we might expect many loops to be significantly broader at their tops than at their footpoints (since, on average, magnetic fields must diverge with height in the solar corona). It is important to understand how the thicknesses of loops vary along their lengths, since such a variation is related to the distribution of electric currents in the corona and is therefore relevant to solar flares and coronal heating. We here present preliminary results of our investigation of thickness variations along coronal loops observed with the Soft X-ray Telescope (SXT) on board the Yohkoh satellite. C1 LOCKHEED PALO ALTO RES LABS, PALO ALTO, CA 94304 USA. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. UNIV TOKYO, INST ASTRON, MITAKA, TOKYO 181, JAPAN. UNIV TOKYO, FAC SCI, DEPT ASTRON, TOKYO 113, JAPAN. RP STANFORD UNIV, CTR SPACE SCI & ASTROPHYS, STANFORD, CA 94305 USA. RI Klimchuk, James/D-1041-2012 OI Klimchuk, James/0000-0003-2255-0305 NR 11 TC 60 Z9 61 U1 0 U2 0 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0004-6264 EI 2053-051X J9 PUBL ASTRON SOC JPN JI Publ. Astron. Soc. Jpn. PY 1992 VL 44 IS 5 BP L181 EP L185 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KB945 UT WOS:A1992KB94500024 ER PT J AU LANG, J BENTLEY, RD BROWN, CM CULHANE, JL DOSCHEK, GA WATANABE, T HIEI, E DESLATTES, RD FLUDRA, A GUTTRIDGE, PR MAGRAW, JE PAYNE, J PIKE, CD TROW, MW AF LANG, J BENTLEY, RD BROWN, CM CULHANE, JL DOSCHEK, GA WATANABE, T HIEI, E DESLATTES, RD FLUDRA, A GUTTRIDGE, PR MAGRAW, JE PAYNE, J PIKE, CD TROW, MW TI THE PERFORMANCE OF THE YOHKOH BRAGG CRYSTAL SPECTROMETER SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN LA English DT Letter DE INSTRUMENTS; DATA PROCESSING; SUN-FLARES; SUN-SPECTRA; SUN-X-RAYS ID SOLAR AB An overview of the Yohkoh Bragg Crystal Spectrometer is given, complemented by details of the laboratory testing prior to launch. The in-orbit performance of the instrument is described. C1 UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, ENGLAND. USN, RES LAB, WASHINGTON, DC 20375 USA. NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. NATL INST STAND & TECHNOL, WASHINGTON, DC 20234 USA. RP LANG, J (reprint author), RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. NR 9 TC 25 Z9 25 U1 0 U2 1 PU ASTRONOMICAL SOC JAPAN PI TOKYO PA C/O NATIONAL ASTRONOMICAL OBSERVATORY, 2-21-1 OSAWA, MITAKA-SHI, TOKYO, 181-8588, JAPAN SN 0004-6264 J9 PUBL ASTRON SOC JPN JI Publ. Astron. Soc. Jpn. PY 1992 VL 44 IS 5 BP L55 EP L61 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KB945 UT WOS:A1992KB94500004 ER PT J AU WATANABE, T HIEI, E LANG, J CULHANE, JL BENTLEY, RD DOSCHEK, GA BROMAGE, BJI BROWN, CM FELDMAN, U FLUDRA, A KATO, T PAYNE, J AF WATANABE, T HIEI, E LANG, J CULHANE, JL BENTLEY, RD DOSCHEK, GA BROMAGE, BJI BROWN, CM FELDMAN, U FLUDRA, A KATO, T PAYNE, J TI HELIUM-LIKE SULFUR EMISSION-LINES IN SOLAR ACTIVE REGIONS AND THEIR SUB-C CLASS VARIABILITY SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN LA English DT Letter DE HELIUM-LIKE SULFUR LINES; SUN-ACTIVITY; SUN-CORONA; SUN-SPECTRA; SUN-X-RAYS ID PLASMA MOTIONS; SPECTRA; FLARE AB Helium-like sulphur spectra (formation temperature, T(m) approximately 18 x 10(6) K) from coronal active regions are being obtained by the Bragg Crystal Spectrometer onboard the Yohkoh mission. The average electron temperatures of the quiescent active regions deduced from the full-disk integrated sulphur spectra are 3.5-4 x 10(6) K. The temporal behavior of the emission lines in the sub-C level events shows that hot plasmas (T > 10(7) K) can be produced in these weak events. C1 RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, ENGLAND. NATL INST FUS SCI, CHIKUSA KU, NAGOYA 464, JAPAN. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP WATANABE, T (reprint author), NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. NR 17 TC 8 Z9 8 U1 0 U2 0 PU ASTRONOMICAL SOC JAPAN PI TOKYO PA C/O NATIONAL ASTRONOMICAL OBSERVATORY, 2-21-1 OSAWA, MITAKA-SHI, TOKYO, 181-8588, JAPAN SN 0004-6264 J9 PUBL ASTRON SOC JPN JI Publ. Astron. Soc. Jpn. PY 1992 VL 44 IS 5 BP L141 EP L145 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KB945 UT WOS:A1992KB94500018 ER PT J AU KNEPP, DL MOKOLE, EL AF KNEPP, DL MOKOLE, EL TI SPACE-BASED RADAR COHERENT PROCESSING DURING SCINTILLATION - VHF THROUGH L BAND SO RADIO SCIENCE LA English DT Article ID ANALYTIC SOLUTION; IONOSPHERIC SCINTILLATION; PULSE-PROPAGATION; EQUATORIAL; TURBULENCE AB Data taken during the Defense Nuclear Agency's Wideband Satellite experiment are analyzed to determine the impact of ionospheric scintillation on coherent integration performance of a space-based radar (SBR). These analyses use a subset of the experimental data base from Kwajalein and Ancon in 1977 and from Kwajalein in 1979. The 1977 measurements are compared to those of 1979, which were closer to the peak of the solar cycle. Under assumptions that are appropriate for strong scintillation the one-way propagation data from the experiment are transformed into data appropriate to a two-way, SBR geometry; measured values of the coherent integration loss are calculated; and an analytical expression for the coherent integration loss is obtained. The analytical result is shown to provide a good fit to the experimentally generated, two-way measurements for strong scintillation. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KNEPP, DL (reprint author), MISSION RES CORP,MONTEREY,CA, USA. NR 28 TC 4 Z9 4 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JAN-FEB PY 1992 VL 27 IS 1 BP 47 EP 61 DI 10.1029/91RS02456 PG 15 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA HF796 UT WOS:A1992HF79600005 ER PT J AU FERGUSON, JA AF FERGUSON, JA TI THE EFFECT OF VARIABILITY OF GROUND CONDUCTIVITY ON THE CALCULATION OF ATMOSPHERIC NOISE USING THUNDERSTORM-BASED MODELS SO RADIO SCIENCE LA English DT Article AB Radio emissions from lightning discharges in thunderstorms are the primary source of atmospheric radio noise at very low and low frequencies (10-60 kHz). Attenuation of the lightning-induced signal between a source in a thunderstorm and a receiver occurs mainly by absorption in the ionosphere and in poorly conducting ground. The attenuation in poorly conducting ground depends primarily on the conductivity so uncertainty in this conductivity contributes directly to uncertainty in calculating the level of atmospheric noise. A thunderstorm-based computer model of atmospheric noise is used to evaluate the effect of this uncertainty in ground conductivity on calculation of atmospheric noise. It is found that this model produces only small variations in the level of atmospheric noise when the conductivity of the ground is varied. This result occurs because it employs large numbers of sources which tend to mask variations in the signal level on paths which cross low-conductivity ground. RP FERGUSON, JA (reprint author), USN,CTR OCEAN SYST,DIV OCEAN & ATMOSPHER SCI,SAN DIEGO,CA 92152, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JAN-FEB PY 1992 VL 27 IS 1 BP 63 EP 70 DI 10.1029/91RS02636 PG 8 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA HF796 UT WOS:A1992HF79600006 ER PT J AU ARBUTHNOT, NP AF ARBUTHNOT, NP TI THE REAL WEST MARGINAL WAY - A POETS AUTOBIOGRAPHY - HUGO,R SO RESOURCES FOR AMERICAN LITERARY STUDY LA English DT Book Review RP ARBUTHNOT, NP (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PENN STATE UNIV PRESS PI UNIVERSITY PK PA SUITE C, BARBARA BLDG. 820 NORTH UNIVERSITY DRIVE, UNIVERSITY PK, PA 16802-1003 SN 0048-7384 J9 RESOUR AM LIT STUD JI Resour. Am. Lit. Study PY 1992 VL 18 IS 2 BP 292 EP 295 PG 4 WC Literature, American SC Literature GA JT882 UT WOS:A1992JT88200061 ER PT J AU BASSILY, S HYAMS, KC ELMASRY, NA HASSAN, NF WATTS, DM AF BASSILY, S HYAMS, KC ELMASRY, NA HASSAN, NF WATTS, DM TI HEPATITIS-C VIRUS-INFECTION AND HEPATOSPLENIC SCHISTOSOMIASIS SO SCANDINAVIAN JOURNAL OF INFECTIOUS DISEASES LA English DT Letter ID ANTIBODIES C1 USN,MED RES INST,BETHESDA,MD 20814. RP BASSILY, S (reprint author), USN,MED RES UNIT 3,CAIRO,EGYPT. NR 6 TC 15 Z9 16 U1 0 U2 0 PU SCANDINAVIAN UNIVERSITY PRESS PI OSLO PA PO BOX 2959 TOYEN, JOURNAL DIVISION CUSTOMER SERVICE, N-0608 OSLO, NORWAY SN 0036-5548 J9 SCAND J INFECT DIS JI Scand. J. Infect. Dis. PY 1992 VL 24 IS 5 BP 687 EP 688 DI 10.3109/00365549209054660 PG 2 WC Infectious Diseases SC Infectious Diseases GA JZ704 UT WOS:A1992JZ70400021 PM 1465592 ER PT J AU CROOKS, R KALU, PN MCNELLEY, TR AF CROOKS, R KALU, PN MCNELLEY, TR TI A MODEL FOR SUBGRAIN SUPERPLASTICITY - COMMENT SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Note RP CROOKS, R (reprint author), USN,SCH POSTGRAD,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 4 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 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JAN 1 PY 1992 VL 26 IS 1 BP 145 EP 149 DI 10.1016/0956-716X(92)90386-S PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GW665 UT WOS:A1992GW66500029 ER PT B AU GUEDRY, FE AF GUEDRY, FE BE COHEN, B TOMKO, DL GUEDRY, F TI PERCEPTION OF MOTION AND POSITION RELATIVE TO THE EARTH - AN OVERVIEW SO SENSING AND CONTROLLING MOTION: VESTIBULAR AND SENSORIMOTOR FUNCTION SE ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Proceedings Paper CT CONF ON SENSING AND CONTROLLING MOTION : VESTIBULAR AND SENSORIMOTOR FUNCTION CY JUL 07-11, 1991 CL PALO ALTO, CA SP NEW YORK ACAD SCI, NASA, NIDOCD, USN, OFF NAVAL RES RP GUEDRY, FE (reprint author), USN,AEROSP MED RES LAB,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 0 TC 21 Z9 21 U1 1 U2 4 PU NEW YORK ACAD SCIENCES PI NEW YORK PA NEW YORK BN 0-89766-734-4 J9 ANN NY ACAD SCI JI Ann.NY Acad.Sci. PY 1992 VL 656 BP 315 EP 328 DI 10.1111/j.1749-6632.1992.tb25218.x PG 14 WC Neurosciences; Physiology SC Neurosciences & Neurology; Physiology GA BW41U UT WOS:A1992BW41U00023 PM 1599152 ER PT J AU STONE, RE TOVEY, CA AF STONE, RE TOVEY, CA TI LIMITING MEDIAN LINES DO NOT SUFFICE TO DETERMINE THE YOLK SO SOCIAL CHOICE AND WELFARE LA English DT Article AB The yolk, an important concept in the spatial model of voting, is defined in two dimensions as the smallest circle intersecting all median lines. In the literature one finds the assumption that the limiting median lines, i.e., those that pass through two voter ideal points, suffice to determine the yolk. Counterexamples are given here which invalidate this assumption. C1 GEORGIA INST TECHNOL,SCH IND & SYST ENGN,ATLANTA,GA 30332. GEORGIA INST TECHNOL,COLL COMP,ATLANTA,GA 30332. USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943. RP STONE, RE (reprint author), AT&T BELL LABS,HOLMDEL,NJ 07733, USA. NR 5 TC 9 Z9 9 U1 1 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0176-1714 J9 SOC CHOICE WELFARE JI Soc Choice Welf. PD JAN PY 1992 VL 9 IS 1 BP 33 EP 35 PG 3 WC Economics; Social Sciences, Mathematical Methods SC Business & Economics; Mathematical Methods In Social Sciences GA HC841 UT WOS:A1992HC84100003 ER PT J AU WALTMAN, J MACHADO, PH AF WALTMAN, J MACHADO, PH TI POSTINDUSTRIALISM AND THE CHANGING FACE OF ADMINISTRATIVE LITIGATION IN ENGLAND, 1960-1985 SO SOCIAL SCIENCE JOURNAL LA English DT Article ID POLITICS C1 USN ACAD,ANNAPOLIS,MD 21402. RP WALTMAN, J (reprint author), UNIV SO MISSISSIPPI,DEPT POLIT SCI,HATTIESBURG,MS 39406, USA. NR 38 TC 0 Z9 0 U1 0 U2 0 PU JAI PRESS INC PI GREENWICH PA 55 OLD POST RD-#2, PO BOX 1678, GREENWICH, CT 06836-1678 SN 0362-3319 J9 SOC SCI J JI Soc. Sci. J. PY 1992 VL 29 IS 2 BP 185 EP 198 DI 10.1016/0362-3319(92)90032-D PG 14 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA HP174 UT WOS:A1992HP17400005 ER PT J AU GLEMBOCKI, OJ SHANABROOK, BV AF GLEMBOCKI, OJ SHANABROOK, BV TI PHOTOREFLECTANCE SPECTROSCOPY OF MICROSTRUCTURES SO SPECTROSCOPY OF SEMICONDUCTORS SE SEMICONDUCTORS AND SEMIMETALS LA English DT Review ID MULTIPLE QUANTUM WELLS; GAAS DOPING SUPERLATTICES; GASB-ALSB SUPERLATTICES; ELECTRIC-FIELD; OPTICAL-PROPERTIES; TEMPERATURE-DEPENDENCE; LINE-SHAPES; HEAVY-HOLE; LIGHT-HOLE; ELECTROREFLECTANCE SPECTROSCOPY RP GLEMBOCKI, OJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 114 TC 104 Z9 104 U1 3 U2 16 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0080-8784 J9 SEMICONDUCT SEMIMET PY 1992 VL 36 BP 221 EP 292 DI 10.1016/S0080-8784(08)62901-4 PG 72 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA BZ72V UT WOS:A1992BZ72V00004 ER PT J AU BROZAK, G SHANABROOK, BV GAMMON, D KATZER, DS AF BROZAK, G SHANABROOK, BV GAMMON, D KATZER, DS TI COLLECTIVE INTERSUBBAND EXCITATIONS IN A MAGNETIC-FIELD SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID RESONANCES; GAAS RP BROZAK, G (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 6 TC 3 Z9 3 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0749-6036 J9 SUPERLATTICE MICROST JI Superlattices Microstruct. PY 1992 VL 12 IS 2 BP 251 EP 255 DI 10.1016/0749-6036(92)90347-8 PG 5 WC Physics, Condensed Matter SC Physics GA JX517 UT WOS:A1992JX51700024 ER PT J AU LIMA, ICD TROPER, A REINECKE, TL AF LIMA, ICD TROPER, A REINECKE, TL TI PHONON ASSISTED CYCLOTRON-RESONANCE IN QUANTUM-WELLS SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID GAAS-ALAS SUPERLATTICES; INTERFACE VIBRATIONAL-MODES; RAMAN-SCATTERING; LO C1 CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. USN,RES LAB,WASHINGTON,DC 20375. RP LIMA, ICD (reprint author), INST NACL PESQUISAS ESPACIAIS,BR-12225 S JOSE CAMPO,BRAZIL. NR 14 TC 6 Z9 6 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0749-6036 J9 SUPERLATTICE MICROST JI Superlattices Microstruct. PY 1992 VL 12 IS 3 BP 331 EP 332 DI 10.1016/0749-6036(92)90275-A PG 2 WC Physics, Condensed Matter SC Physics GA KA760 UT WOS:A1992KA76000012 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI OPTICAL-ABSORPTION DUE TO INTERFACE PHONONS AND INTERFACE PLASMONS OF QUANTUM DOTS SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID RAMAN-SCATTERING; THIN-FILMS; CRYSTALS; SURFACE 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 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0749-6036 J9 SUPERLATTICE MICROST JI Superlattices Microstruct. PY 1992 VL 12 IS 4 BP 553 EP 556 DI 10.1016/0749-6036(92)90320-5 PG 4 WC Physics, Condensed Matter SC Physics GA KC947 UT WOS:A1992KC94700027 ER PT J AU BOUT, FA AF BOUT, FA TI REAL-SPACE TIGHT-BINDING AND DISCRETE PHASE-SPACE MANY-BODY QUANTUM TRANSPORT IN GRANULAR NANOELECTRONICS SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID ELECTRONS RP BOUT, FA (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 15 TC 8 Z9 8 U1 0 U2 0 PU ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD PI LONDON PA 24-28 OVAL RD, LONDON NW1 7DX, ENGLAND SN 0749-6036 J9 SUPERLATTICE MICROST JI Superlattices Microstruct. PY 1992 VL 11 IS 1 BP 103 EP 111 DI 10.1016/0749-6036(92)90370-K PG 9 WC Physics, Condensed Matter SC Physics GA HA672 UT WOS:A1992HA67200018 ER PT J AU SNOW, ES CAMPBELL, PM AF SNOW, ES CAMPBELL, PM TI LIGHT-ACTIVATED RESISTANCE SWITCHING IN GAAS/ALGAAS NATURALLY-OCCURRING NANOSTRUCTURES SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID STATES; DIODES; NOISE RP SNOW, ES (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0749-6036 J9 SUPERLATTICE MICROST JI Superlattices Microstruct. PY 1992 VL 11 IS 3 BP 293 EP 296 DI 10.1016/0749-6036(92)90384-H PG 4 WC Physics, Condensed Matter SC Physics GA HN107 UT WOS:A1992HN10700011 ER PT J AU TURNER, NH AF TURNER, NH TI ESTIMATES OF PEAK AREAS AND RELATIVE ATOMIC AMOUNTS FROM WIDE-SCAN XPS SPECTRA SO SURFACE AND INTERFACE ANALYSIS LA English DT Article AB In an earlier investigation a polynomial method to estimate area and peak positions in wide-scan XPS spectra was demonstrated with digital data (see N. H. Turner and A. M. Single, Surf. Interface Anal. 15, 215 (1990)). This method uses a density of points of about one per electron-volt. It was found that in most of the cases studied the procedure gave area estimates that agreed reasonably well with determinations made from narrow-region scans (which had a density of six to eight points per electron-volt) with non-linear least-squares (NLLS) calculations. In addition, ratios between the areas of the various peaks were in reasonable accord with the NLLS determinations. However, these estimates were made with fairly intense peaks. In this study, area estimates were made by the polynomial procedure that included peaks with low intensity (i.e. surface contaminants or elements present in relatively small amounts). Also, approximations of the relative atomic amounts were made. These estimates then were compared to those from narrow-region scan determinations that used the NLLS approach. Samples used included an insulator and conductors. In most instances the area ratios and the estimates of the relative atomic amounts from the polynomial procedure agreed to within a few per cent of values from the NLLS determinations. Poorer agreement was found in the estimates of adventitious carbon. This was due to both the comparatively small peak area and low relative intensity cross-section for carbon. Also, the polynomial method did not work well when the adventitious carbon signal was comprised of several species. Much better agreement was obtained between the polynomial procedure and the NLLS approach with elements that have a relatively high photoelectron cross-section. RP TURNER, NH (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375, USA. NR 10 TC 3 Z9 3 U1 0 U2 6 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD JAN PY 1992 VL 18 IS 1 BP 47 EP 51 DI 10.1002/sia.740180108 PG 5 WC Chemistry, Physical SC Chemistry GA HE589 UT WOS:A1992HE58900007 ER PT J AU GOLDMAN, G WELBOURN, R KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB AF GOLDMAN, G WELBOURN, R KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB TI SYNERGISM BETWEEN LEUKOTRIENE-B4 AND THROMBOXANE-A2 IN MEDIATING ACID-ASPIRATION INJURY SO SURGERY LA English DT Note ID LEUKOCYTE ADHESION; LIMB ISCHEMIA; NEUTROPHILS; DEPENDENCE; MECHANISMS; PULMONARY AB Acid aspiration leads to thromboxane-dependent lung neutrophil sequestration associated with microvascular permeability increase. Leukotriene B4 (LTB4) is postulated to be a cofactor in the thromboxane-induced inflammatory response. This study tests the interaction between LTB4 and thromboxane, focusing on LTB4 induction of thromboxane-dependent lung neutrophil sequestration after acid aspiration. Anesthetized rats underwent tracheostomy and insertion of a cannula in a left lung segment. This was followed by instillation of either 0.1 ml 0.1N hydrochloric acid (n = 18) or 0.1 ml saline in control rats (n = 18). When assayed at 3 hours, acid aspiration led to increased plasma levels of LTB4 and thromboxane B2 (TxB2), higher than control values (p < 0.05). The rise in plasma LTB4 was correlated (p < 0.05; r = 0.83) with sequestration of neutrophils in the nonaspirated lung. The entrapment of thromboxane-dependent lung neutrophil was associated with an increase in protein concentration in bronchoalveolar lavage of the aspirated and nonaspirated sides and an increase in lung wet to dry weight ratio. Pretreatment of other rats (n = 18) with the lipoxygenase inhibitor diethylcarbamazine IV prevented an aspiration-induced rise in plasma LTB4 and TxB2. Further, there was an attenuation of lung leukosequestration and protein leak in bronchoalveolar lavage and lung edema (all p < 0.05). Pretreatment of other rats (n = 12) with the leukotriene receptor antagonist FPL 55712 IV did not prevent the aspiration-induced rise in LTB4 or TxB2, but otherwise was as effective as diethylcarbamazine in preventing injury. Finally, other hydrochloric acid-aspirated rats (n = 8) were pretreated intravenously with the thromboxane synthetase inhibitor OKY 046 or the thromboxane receptor antagonist SQ 29548. Both agents limited the aspiration-induced rise in plasma LTB4 (p < 0.05). The data indicate that localized acid aspiration induces synthesis of LTB4 and thromboxane A2. Inhibition of either leukotriene or thromboxane will limit PMN adhesion and increased lung permeability. C1 BRIGHAM & WOMENS HOSP,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. BRIGHAM & WOMENS HOSP,DEPT PATHOL,BOSTON,MA 02115. HARVARD UNIV,SCH MED,BOSTON,MA 02115. USN,BLOOD RES LAB,WASHINGTON,DC 20350. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02215. FU NHLBI NIH HHS [HL 16714-13]; NIGMS NIH HHS [GM 35141-03, GM 24891-11] NR 19 TC 52 Z9 52 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0039-6060 J9 SURGERY JI Surgery PD JAN PY 1992 VL 111 IS 1 BP 55 EP 61 PG 7 WC Surgery SC Surgery GA GY465 UT WOS:A1992GY46500008 PM 1309402 ER PT J AU SINGH, A MARKOWITZ, M TSAO, LI AF SINGH, A MARKOWITZ, M TSAO, LI TI PHOSPHATIDYLHYDROXYALKANOLS AS VERSATILE INTERMEDIATES IN THE SYNTHESIS OF HEADGROUP MODIFIED DIACETYLENIC PHOSPHOLIPIDS SO SYNTHETIC COMMUNICATIONS LA English DT Article ID PHOSPHATIDYLCHOLINES; MICROSTRUCTURES; ANALOGS AB Phospholipase D extract (from savoy cabbage) mediates exchange of omega hydroxyalkanols (n= 2-4) with the choline moiety of phosphatidylcholines to produce corresponding phosphatidylhydroxyalkanols in >70% yield. The phosphatidyl hydroxyalkanol and its chloro analogue-were further reacted with molecules containing carboxylic and amine functionality respectively, providing an easy and efficient method to produce headgroup modified phospholipids. RP SINGH, A (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 20 TC 13 Z9 14 U1 0 U2 0 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0039-7911 J9 SYNTHETIC COMMUN JI Synth. Commun. PY 1992 VL 22 IS 16 BP 2293 EP 2304 DI 10.1080/00397919208019084 PG 12 WC Chemistry, Organic SC Chemistry GA JL902 UT WOS:A1992JL90200001 ER PT J AU NEMEROFF, NH MCDONNELL, ME AXTEN, JM BUCKLEY, LJ AF NEMEROFF, NH MCDONNELL, ME AXTEN, JM BUCKLEY, LJ TI SYNTHESIS AND CHARACTERIZATION OF NOVEL FERROCENYL-SUBSTITUTED PYRROLES SO SYNTHETIC COMMUNICATIONS LA English DT Article AB The syntheses of new ferrocene substituted pyrroles has been carried out by the reaction of TosMIC with an alpha, beta-unsaturated ferrocene derivative. C1 USN,POLYMER PHYS GRP,WARMINSTER,PA 18974. RP NEMEROFF, NH (reprint author), PHILADELPHIA COLL TEXT & SCI,DEPT CHEM,SCHOOLHOUSE LANE & HENRY AVE,PHILADELPHIA,PA 19144, USA. NR 6 TC 7 Z9 7 U1 0 U2 3 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0039-7911 J9 SYNTHETIC COMMUN JI Synth. Commun. PY 1992 VL 22 IS 22 BP 3271 EP 3275 DI 10.1080/00397919208021142 PG 5 WC Chemistry, Organic SC Chemistry GA KD686 UT WOS:A1992KD68600014 ER PT J AU BAIRD, JK PURNOMO JONES, TR AF BAIRD, JK PURNOMO JONES, TR TI DIAGNOSIS OF MALARIA IN THE FIELD BY FLUORESCENCE MICROSCOPY OF QBC CAPILLARY TUBES SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article AB The diagnostic performance of commercial capillary tubes containing acridine orange dye (QBC(R)) was compared with the standard diagnosis of malaria by microscopical examination of Giemsa-stained thick blood films (GTS) in remote field conditions. The comparison was conducted among 165 volunteers living in north-eastern Irian Jaya, Indonesia, an area having hyperendemic malaria transmission. By GTS, 65 volunteers were positive for malaria, but only 49 were judged positive by QBC(R). Among the 100 blood films found negative by GTS, 5 were considered positive by QBC(R). Thus, relative to a GTS standard, the sensitivity and specificity of the QBC(R) was 75% and 95%, respectively. The mean limit of detection for the QBC(R) was approximately 60 parasites per mu-l blood, whereas the limit of detection for GTS was 20 parasites per mu-l blood. Also, a number of practical difficulties were encountered using the QBC(R) at the field site. The QBC(R) approach to diagnosis of malaria was less sensitive and more inconvenient than GTS under the conditions in remote Irian Jaya. C1 USN,MED RES UNIT 2,JAKARTA DETACHMENT,APO,SAN FRANCISCO,CA 96356. NR 9 TC 30 Z9 32 U1 0 U2 0 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD JAN-FEB PY 1992 VL 86 IS 1 BP 3 EP 5 DI 10.1016/0035-9203(92)90412-6 PG 3 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA HH642 UT WOS:A1992HH64200002 PM 1566296 ER PT J AU SAHAY, SK KLINE, RA MIGNOGNA, R AF SAHAY, SK KLINE, RA MIGNOGNA, R TI PHASE AND GROUP-VELOCITY CONSIDERATIONS FOR DYNAMIC MODULUS MEASUREMENT IN ANISOTROPIC MEDIA SO ULTRASONICS LA English DT Article DE PHASE VELOCITY; GROUP VELOCITY; ANISOTROPIC MEDIA; ELASTIC PROPERTY RECONSTRUCTION ID ELASTIC-CONSTANTS; COMPOSITE-MATERIALS AB In anisotropic media, the direction of energy propagation does not necessarily coincide with the wave normal, i.e. the energy flux vector does not coincide with the wave normal. Since, experimentally, one measures group velocity not phase velocity, one must therefore be careful in interpreting ultrasonic wave speed measurements in anisotropic media. This is of particular importance in elastic property reconstruction where acoustic velocity measurements are used as the basis for determining anisotropic material properties. In this work, the consequences of energy flux deviation from the wave normal are considered for typical experimental geometries. Particular attention is devoted to developing appropriate relationships between the phase velocity and ultrasonic transit time measurements, as these relations are most useful for elastic property reconstruction. In all the cases considered, it is shown that the phase velocity can be directly calculated from appropriate time delay measurements. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SAHAY, SK (reprint author), UNIV OKLAHOMA,SCH AEROSP & MECH ENGN,NORMAN,OK 73019, USA. NR 19 TC 11 Z9 12 U1 2 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0041-624X J9 ULTRASONICS JI Ultrasonics PY 1992 VL 30 IS 6 BP 373 EP 382 DI 10.1016/0041-624X(92)90093-2 PG 10 WC Acoustics; Radiology, Nuclear Medicine & Medical Imaging SC Acoustics; Radiology, Nuclear Medicine & Medical Imaging GA JX045 UT WOS:A1992JX04500005 ER PT J AU IMBERT, G COLTON, JS LONG, W GROSSMAN, Y MOORE, HJ AF IMBERT, G COLTON, JS LONG, W GROSSMAN, Y MOORE, HJ TI A SYSTEM FOR SATURATING INVITRO PREPARATIONS WITH HIGH-PRESSURE O2, HE, H2, AND MIXTURES SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article AB Saturation of a liquid with gas before perfusing a tissue or cellular preparation under pressure can be achieved by bubbling the gas through the liquid. A container for this purpose that is housed in the pressure chamber with the preparation allows saturation of the liquid under hyperbaric conditions. Sealing the container allows saturation with a gas different from the gas used to compress the pressure chamber. If the pressure within the sealed container is maintained at a slightly higher level, the bubbling gas can also provide the driving force for the liquid to flow to the preparation. Based on this concept, an apparatus was built and tested to pressures of 6.8 MPa. This paper describes the saturator and the associated circuitry used to control bubbling gas pressure relative to the pressure vessel, gas flow through the saturator, and liquid flow to the preparation. A special application in the case of hydrogen gas is described, where this system has added safety advantages. C1 USN,MED RES INST,DIVING BIOMED TECHNOL FUNCT AREA,BETHESDA,MD 20889. NR 1 TC 1 Z9 1 U1 0 U2 2 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 0093-5387 J9 UNDERSEA BIOMED RES PD JAN PY 1992 VL 19 IS 1 BP 49 EP 53 PG 5 WC Oceanography SC Oceanography GA HE892 UT WOS:A1992HE89200007 PM 1536063 ER PT J AU SEDEGAH, M CHIANG, CH WEISS, WR MELLOUK, S COCHRAN, MD HOUGHTEN, RA BEAUDOIN, RL SMITH, D HOFFMAN, SL AF SEDEGAH, M CHIANG, CH WEISS, WR MELLOUK, S COCHRAN, MD HOUGHTEN, RA BEAUDOIN, RL SMITH, D HOFFMAN, SL TI RECOMBINANT PSEUDORABIES VIRUS CARRYING A PLASMODIUM GENE - HERPESVIRUS AS A NEW LIVE VIRAL VECTOR FOR INDUCING T-CELL AND B-CELL IMMUNITY SO VACCINE LA English DT Article DE MALARIA; PLASMODIUM-YOELII; CIRCUMSPOROZOITE PROTEIN; RECOMBINANT PSEUDORABIES VIRUS; CYTOTOXIC LYMPHOCYTES-T; ANTIBODIES ID CIRCUMSPOROZOITE PROTEIN; MALARIA SPOROZOITES; YOELII; EXPRESSION; ANTIGENS; SIMPLEX; FALCIPARUM; TYPE-1; GLYCOPROTEIN; HEPATOCYTES AB In Balb/c mice, the sterile protective immunity induced by immunization with radiation-attenuated Plasmodium yoelii sporozoites is eliminated by in vivo depletion of CD8 + T lymphocytes, suggesting that cytotoxic T lymphocytes (CTL) against malaria antigens expressed on infected hepatocytes are required for mediating this protective immunity. To produce a vaccine that would induce CTL against the P. yoelii circumsporozoite protein (CS), we constructed an attenuated pseudorabies virus (PR V) containing a gene encoding this protein. Balb/c mice that received three doses of 10(7) plaque-forming units (p.f.u.) of this vaccine intravenously at 3 week intervals developed high levels of antibodies to sporozoites (indirect fluorescent antibody titre = 4096) and CTL against a 16 amino acid epitope (SYVPSAEQILEFVKQI, amino acids 281-296) from the P. yoelii CS protein designated PYCTL1. The cytotoxic activity of the CTL was antigen-specific, MHC-restricted, and dependent on CD8+ T cells. Furthermore, these CTL eliminated P. yoelii-infected hepatocytes from in vitro culture, indicating that they recognize this peptide on the surface of infected hepatocytes. However, all nine mice that were challenged with 200 sporozoites developed a blood-stage malaria infection. We attribute this lack of protection to the great difficulty of inducing sterile immunity against this highly infectious parasite P. yoelii. We conclude that recombinant pseudorabies virus (PRV) worked successfully as a live vaccine vector to induce both antibodies and CTL, albeit non-protective in vivo, and the herpesviruses should be considered as carriers for subunit vaccines where T- and B-cell immunity is required. C1 PAN AMER HLTH ORG,WASHINGTON,DC 20037. SYNTRO CORP,SAN DIEGO,CA 92121. TORREY PINES INST MOLEC STUDIES,SAN DIEGO,CA 92121. UNIV MARYLAND,SCH MED,DEPT MED,DIV GEOG MED,CTR VACCINE DEV,BALTIMORE,MD 21201. RP SEDEGAH, M (reprint author), USN,MED RES INST,MALARIA PROGRAM,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. NR 37 TC 33 Z9 36 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0264-410X J9 VACCINE JI Vaccine PY 1992 VL 10 IS 9 BP 578 EP 584 DI 10.1016/0264-410X(92)90436-N PG 7 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA JB961 UT WOS:A1992JB96100003 PM 1323900 ER PT J AU HERRINGTON, DA LOSONSKY, GA SMITH, G VOLVOVITZ, F COCHRAN, M JACKSON, K HOFFMAN, SL GORDON, DM LEVINE, MM EDELMAN, R AF HERRINGTON, DA LOSONSKY, GA SMITH, G VOLVOVITZ, F COCHRAN, M JACKSON, K HOFFMAN, SL GORDON, DM LEVINE, MM EDELMAN, R TI SAFETY AND IMMUNOGENICITY IN VOLUNTEERS OF A RECOMBINANT PLASMODIUM-FALCIPARUM CIRCUMSPOROZOITE PROTEIN MALARIA VACCINE PRODUCED IN LEPIDOPTERAN CELLS SO VACCINE LA English DT Article DE PLASMODIUM-FALCIPARUM MALARIA VACCINE; RECOMBINANT VACCINE; SPOROZOITE ID VIVAX SPOROZOITE VACCINE; CD8+ T-CELLS; EPITOPE; PROTECTION; IMMUNITY; PARASITE; MAP AB A recombinant Plasmodium falciparum circumsporozoite (CS) antigen (rPfCSA) was produced in insect cells using a baculovirus expression vector containing the entire CS gene. This near full-length CS antigen was adsorbed onto aluminium phosphate for use as a malaria vaccine. In a study of safety and immunogenicity, 20 volunteers were divided into four groups of five each and inoculated intramuscularly with 10, 100, 500 or 1000-mu-g of vaccine. Primary vaccinations were followed by two booster immunizations at 2 and 6 months. Three volunteers developed prominent local reactions manifested as tenderness, redness and swelling at the injection site following the second or third vaccination. All symptoms resolved spontaneously within 72 h. Postimmunization sera from six of 20 volunteers showed seroconversions as measured by Western blot, using rPfCSA as antigen. However, specific anti-CS protein antibody could not be detected by indirect immunoflourescence against intact sporozoites or by ELISA using rPfCSA or peptide to the repeat region. In addition, 18 of 20 volunteers developed antibody to baculovirus proteins as determined by ELISA and/or Western blot. Antigen-driven replication studies using peripheral blood mononuclear cells from vaccinees failed to detect proliferative responses specific to CS protein. This recombinant CS protein vaccine, as formulated, was minimally immunogenic in humans. C1 UNIV MARYLAND,DEPT MED,DIV GEOG MED,CTR VACCINE DEV,BALTIMORE,MD 21201. USN,MED RES INST,BETHESDA,MD 20814. WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. MICROGENESYS INC,MERIDEN,CT 06450. FU NIAID NIH HHS [N01-AI-62528] NR 24 TC 26 Z9 28 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0264-410X J9 VACCINE JI Vaccine PY 1992 VL 10 IS 12 BP 841 EP 846 DI 10.1016/0264-410X(92)90047-N PG 6 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA JN775 UT WOS:A1992JN77500007 PM 1455910 ER PT J AU VIEIRA, MEC SUBRAMANIAN, A BOKUNIEWICZ, HJ AF VIEIRA, MEC SUBRAMANIAN, A BOKUNIEWICZ, HJ TI PLUME DISPERSION OF DILUTE SUSPENSIONS - A MODEL OF BARGE OVERFLOW ADAPTED FOR USE IN A PERSONAL-COMPUTER SO WATER SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT SPECIALIZED CONF ON MARINE DISPOSAL SYSTEMS CY NOV 20-22, 1991 CL LISBON, PORTUGAL SP INT ASSOC WATER POLLUT RES & CONTROL DE PLUME DISPERSION; BARGE OVERFLOW; HORIZONTAL DIFFUSION; DREDGING AB A practical method was developed to estimate the areal extent of the plume associated with the overflow of dredged material during barge filling operations in shallow waters. The predictive model is based on the Okubo-Pritchard relationship for horizontal diffusion; it solves the transport equation which governs the distribution of total suspended solids or dissolved species. The model runs in a Personal Computer and provides the spatial distribution of particulate concentrations in the plume from minimum information on local hydrography, the intensity of advective and dispersive processes and the characteristics and discharge rate of the dredged material. The extent of the plume is defined as the isoline of acceptable concentration of a specified material. The rate of decay of the plume once the overflow terminates is also computed. C1 SUNY STONY BROOK,MARINE SCI RES CTR,STONY BROOK,NY 11794. RP VIEIRA, MEC (reprint author), USN ACAD,DEPT OCEANOG,ANNAPOLIS,MD 21402, USA. NR 11 TC 0 Z9 0 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1223 J9 WATER SCI TECHNOL JI Water Sci. Technol. PY 1992 VL 25 IS 9 BP 173 EP 179 PG 7 WC Engineering, Environmental; Environmental Sciences; Water Resources SC Engineering; Environmental Sciences & Ecology; Water Resources GA KA789 UT WOS:A1992KA78900019 ER PT J AU OLSON, PE AF OLSON, PE TI NERVOUS ABOUT TICKS - ASSESSING LYME-DISEASE RISK IN SAN-DIEGO COUNTY SO WESTERN JOURNAL OF MEDICINE LA English DT Letter RP OLSON, PE (reprint author), USN HOSP,DEPT PREVENT MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 1 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 0093-0415 J9 WESTERN J MED JI West. J. Med. PD JAN PY 1992 VL 156 IS 1 BP 87 EP 87 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA GZ532 UT WOS:A1992GZ53200027 PM 1734618 ER PT S AU PICKETT, WE PEDERSON, MR JACKSON, KA ERWIN, SC AF PICKETT, WE PEDERSON, MR JACKSON, KA ERWIN, SC BE Moustakas, TD Pankove, JI Hamakawa, Y TI THEORETICAL-STUDIES OF DIAMOND SURFACE-CHEMISTRY AND DIAMOND METAL INTERFACES SO WIDE BAND GAP SEMICONDUCTORS SE Materials Research Society Symposium Proceedings LA English DT Proceedings Paper CT SYMP ON WIDE BAND GAP SEMICONDUCTORS, AT THE 1991 FALL MEETING OF THE MATERIALS RESEARCH SOC CY DEC 02-06, 1991 CL BOSTON, MA SP MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, NATL RENEWABLE ENERGY LAB, BANDGAP TECHNOL, KENNAMETAL, NIPPONDENSO, SANYO ELECT C1 USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RI Erwin, Steven/B-1850-2009 NR 0 TC 0 Z9 0 U1 0 U2 2 PU MATERIALS RESEARCH SOC PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-136-0 J9 MATER RES SOC SYMP P PY 1992 VL 242 BP 3 EP 12 DI 10.1557/PROC-242-3 PG 10 WC Materials Science, Ceramics; Physics, Condensed Matter SC Materials Science; Physics GA BW28F UT WOS:A1992BW28F00001 ER PT S AU DOVERSPIKE, K BUTLER, JE FREITAS, JA AF DOVERSPIKE, K BUTLER, JE FREITAS, JA BE Moustakas, TD Pankove, JI Hamakawa, Y TI DEPOSITION OF FLAME GROWN DIAMOND FILMS IN A CONTROLLED-ATMOSPHERE SO WIDE BAND GAP SEMICONDUCTORS SE Materials Research Society Symposium Proceedings LA English DT Proceedings Paper CT SYMP ON WIDE BAND GAP SEMICONDUCTORS, AT THE 1991 FALL MEETING OF THE MATERIALS RESEARCH SOC CY DEC 02-06, 1991 CL BOSTON, MA SP MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, NATL RENEWABLE ENERGY LAB, BANDGAP TECHNOL, KENNAMETAL, NIPPONDENSO, SANYO ELECT C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 0 TC 3 Z9 3 U1 0 U2 0 PU MATERIALS RESEARCH SOC PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-136-0 J9 MATER RES SOC SYMP P PY 1992 VL 242 BP 37 EP 42 DI 10.1557/PROC-242-37 PG 6 WC Materials Science, Ceramics; Physics, Condensed Matter SC Materials Science; Physics GA BW28F UT WOS:A1992BW28F00005 ER PT S AU PEHRSSON, PE GLESENER, J MORRISH, AA AF PEHRSSON, PE GLESENER, J MORRISH, AA BE Moustakas, TD Pankove, JI Hamakawa, Y TI THE CVD DIAMOND NUCLEATION MECHANISM ON SI OVERLAID WITH SP2 CARBON SO WIDE BAND GAP SEMICONDUCTORS SE Materials Research Society Symposium Proceedings LA English DT Proceedings Paper CT SYMP ON WIDE BAND GAP SEMICONDUCTORS, AT THE 1991 FALL MEETING OF THE MATERIALS RESEARCH SOC CY DEC 02-06, 1991 CL BOSTON, MA SP MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, NATL RENEWABLE ENERGY LAB, BANDGAP TECHNOL, KENNAMETAL, NIPPONDENSO, SANYO ELECT C1 USN, DIV CHEM, WASHINGTON, DC 20350 USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MATERIALS RESEARCH SOC PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-136-0 J9 MATER RES SOC SYMP P PY 1992 VL 242 BP 57 EP 62 DI 10.1557/PROC-242-57 PG 6 WC Materials Science, Ceramics; Physics, Condensed Matter SC Materials Science; Physics GA BW28F UT WOS:A1992BW28F00008 ER PT S AU FREITAS, JA STROM, U DOVERSPIKE, K MARKS, CM SNAIL, KA AF FREITAS, JA STROM, U DOVERSPIKE, K MARKS, CM SNAIL, KA BE Moustakas, TD Pankove, JI Hamakawa, Y TI OPTICAL EVIDENCE OF REDUCTION OF RADIATIVE DEFECTS IN DIAMOND FILMS GROWN BY ACETYLENE-OXYGEN FLAMES SO WIDE BAND GAP SEMICONDUCTORS SE Materials Research Society Symposium Proceedings LA English DT Proceedings Paper CT SYMP ON WIDE BAND GAP SEMICONDUCTORS, AT THE 1991 FALL MEETING OF THE MATERIALS RESEARCH SOC CY DEC 02-06, 1991 CL BOSTON, MA SP MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, NATL RENEWABLE ENERGY LAB, BANDGAP TECHNOL, KENNAMETAL, NIPPONDENSO, SANYO ELECT C1 USN, RES LAB, WASHINGTON, DC 20375 USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU MATERIALS RESEARCH SOC PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-136-0 J9 MATER RES SOC SYMP P PY 1992 VL 242 BP 139 EP 144 DI 10.1557/PROC-242-139 PG 6 WC Materials Science, Ceramics; Physics, Condensed Matter SC Materials Science; Physics GA BW28F UT WOS:A1992BW28F00019 ER PT S AU GLESENER, JW MORRISH, AA SNAIL, KA AF GLESENER, JW MORRISH, AA SNAIL, KA BE Moustakas, TD Pankove, JI Hamakawa, Y TI ELECTRICAL-PROPERTIES OF SCHOTTKY JUNCTIONS ON HOMOEPITAXIAL FLAME GROWN DIAMOND SO WIDE BAND GAP SEMICONDUCTORS SE Materials Research Society Symposium Proceedings LA English DT Proceedings Paper CT SYMP ON WIDE BAND GAP SEMICONDUCTORS, AT THE 1991 FALL MEETING OF THE MATERIALS RESEARCH SOC CY DEC 02-06, 1991 CL BOSTON, MA SP MAT RES SOC, USAF, OFF SCI RES, USN, OFF NAVAL RES, NATL RENEWABLE ENERGY LAB, BANDGAP TECHNOL, KENNAMETAL, NIPPONDENSO, SANYO ELECT C1 USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATERIALS RESEARCH SOC PI WARRENDALE PA 506 KEYSTONE DRIVE, WARRENDALE, PA 15088-7563 USA SN 0272-9172 BN 1-55899-136-0 J9 MATER RES SOC SYMP P PY 1992 VL 242 BP 161 EP 164 DI 10.1557/PROC-242-161 PG 4 WC Materials Science, Ceramics; Physics, Condensed Matter SC Materials Science; Physics GA BW28F UT WOS:A1992BW28F00022 ER PT J AU CHOU, WC PETROU, A WARNOCK, J JONKER, BT AF CHOU, WC PETROU, A WARNOCK, J JONKER, BT TI SPIN SUPERLATTICE BEHAVIOR IN ZNSE ZN0.99FE0.01SE QUANTUM-WELLS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENERGY AB Spin superlattices with alternating nonmagnetic and magnetic layers, in which a tunable spin-dependent potential exists, have been fabricated. We show that the ZnSe/Zn0.99Fe0.01Se system, in which field-induced spin splitting in both valence and conduction bands can become much larger than the residual zero-field potentials, exhibits spin superlattice behavior. Low-temperature magnetoreflectance experiments have been used to investigate the nature of these structures, verifying through field-dependent spin splittings and transition strengths that they are in fact true spin superlattices. C1 SUNY BUFFALO,CTR ELECTR & ELECTROOPT MAT,BUFFALO,NY 14260. IBM CORP,DIV RES,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. USN,RES LAB,WASHINGTON,DC 20375. RP CHOU, WC (reprint author), SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260, USA. NR 9 TC 93 Z9 95 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 DEC 30 PY 1991 VL 67 IS 27 BP 3820 EP 3823 DI 10.1103/PhysRevLett.67.3820 PG 4 WC Physics, Multidisciplinary SC Physics GA GX161 UT WOS:A1991GX16100023 ER PT J AU ABRAHAM, MH WHITING, GS ANDONIANHAFTVAN, J STEED, JW GRATE, JW AF ABRAHAM, MH WHITING, GS ANDONIANHAFTVAN, J STEED, JW GRATE, JW TI HYDROGEN-BONDING .19. THE CHARACTERIZATION OF 2 POLY(METHYLPHENYLSILOXANE)S SO JOURNAL OF CHROMATOGRAPHY LA English DT Note ID RETENTION VOLUMES; SOLVENTS; INDEXES; SOLUTES; PHASES; OV-101 AB Two commercial samples of poly(methylphenylsiloxane) were characterised using our solvation equation, log L = c + rR2 + s-pi(H)(2) + a-alpha(H)(2) + b-beta(H)(2) + l log L16 where L is the gas-liquid partition coefficient for a series of solutes on a given stationary phase, and the explanatory variables are R2 an excess molar refraction, pi(H)(2) the solute dipolarity/polarisability, alpha(H)(2) and beta(H)(2) the solute hydrogen-bond acidity and basicity, and log L16 where L16 is the solute gas-liquid partition coefficient on hexadecane at 25-degrees-C. For both samples, a substantial b-constant was found, viz. 1.22 +/- 0.07 and 0.49 +/- 0.08 at 25-degrees-C, suggesting that they can act as hydrogen-bond acid (contrary to their chemical formulation). Examination of the bulk liquid stationary phases by IR showed the presence of OH groups and confirmed our analysis by the solvation equation. It is suggested that workers using the OV or SE series of siloxanes routinely check the bulk stationary phases by IR in order to assess the presence or absence of OH groups. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP ABRAHAM, MH (reprint author), UNIV LONDON UNIV COLL,DEPT CHEM,20 GORDON ST,LONDON WC1H 0AJ,ENGLAND. RI Steed, Jonathan/A-7916-2008 OI Steed, Jonathan/0000-0002-7466-7794 NR 10 TC 40 Z9 40 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD DEC 27 PY 1991 VL 588 IS 1-2 BP 361 EP 364 DI 10.1016/0021-9673(91)85048-K PG 4 WC Chemistry, Analytical SC Chemistry GA GZ704 UT WOS:A1991GZ70400048 ER PT J AU SCHMIDT, PP DUNLAP, BI WHITE, CT AF SCHMIDT, PP DUNLAP, BI WHITE, CT TI ENDOHEDRAL VIBRATIONS OF NA+ IN C-60 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID ALKALI-METAL CATIONS; SPECTRUM AB We report the results of a theoretical investigation of the possible vibrations of a single sodium cation trapped inside C60. To begin, all-electron local density functional (LDF) calculations provided the total energy of the C60Na+ species with respect to the displacement of the ion along the internal C3-upsilon and C5-upsilon symmetry axes. Consistent with other calculations, we found the positions of equilibrium displaced from the center; thus, tunneling is possible between positions of equilibrium. To analyze this situation, a pair potential for the interaction between the ion and the individual carbon atoms was fit to the LDF-determined energies. A completely anharmonic variational analysis that accounts for the delocalization via tunneling of the ion inside the sphere was used to determine the fundamental frequencies. Clusters of infrared (dipole) active transitions over a wide range of frequencies were found. C1 USN,RES LAB,DIV CHEM,THEORET CHEM SECT,CODE 6179,WASHINGTON,DC 20375. RP SCHMIDT, PP (reprint author), OFF NAVAL RES,DIV CHEM & MAT,ARLINGTON,VA 22217, USA. OI Dunlap, Brett/0000-0003-1356-6559 NR 23 TC 50 Z9 50 U1 0 U2 3 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 DEC 26 PY 1991 VL 95 IS 26 BP 10537 EP 10541 DI 10.1021/j100179a005 PG 5 WC Chemistry, Physical SC Chemistry GA GY164 UT WOS:A1991GY16400005 ER PT J AU CERIO, FM WEIMER, WA AF CERIO, FM WEIMER, WA TI ELECTROSTATIC-PROBE MEASUREMENTS FOR MICROWAVE PLASMA-ASSISTED CHEMICAL VAPOR-DEPOSITION OF DIAMOND SO APPLIED PHYSICS LETTERS LA English DT Article ID CROSS-SECTIONS AB The electron energy and density in a diamond microwave plasma-assisted chemical vapor deposition reactor are determined using a double-electrostatic-probe technique. For a reactor feed gas composition of 2% CH4, 1% O2 in H-2, electron temperatures of 6 eV and electron densities of approximately 1.0 X 10(11) cm-3 were measured. These values are consistent with optical emission spectroscopic results. The electron temperature is not strongly dependent on the amount of O2 added to the reactor feed mixture, indicating that the plasma essentially retains the energetic parameters of a hydrogen plasma. C1 USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 19 TC 19 Z9 19 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 DEC 23 PY 1991 VL 59 IS 26 BP 3387 EP 3389 DI 10.1063/1.105683 PG 3 WC Physics, Applied SC Physics GA GW018 UT WOS:A1991GW01800013 ER PT J AU ZEPF, SE WHITMORE, BC LEVISON, HF AF ZEPF, SE WHITMORE, BC LEVISON, HF TI OPTICAL COLORS OF EARLY-TYPE GALAXIES IN COMPACT-GROUPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, CLUSTERING; GALAXIES, PHOTOMETRY ID CCD SURFACE PHOTOMETRY; ELLIPTICAL GALAXIES; STANDARD STARS; ISOPHOTE SHAPES; DISK GALAXIES; S0 GALAXIES; CATALOG; VIRGO AB We present UBVRI colors of a sample of 55 elliptical galaxies as well as 21 S0 galaxies in Hickson compact groups. Four of the elliptical galaxies and one of the S0 galaxies in the compact groups are significantly bluer than normal for early-type galaxies of their luminosity. A population of elliptical galaxies with blue optical colors is predicted by standard models of the evolution of galaxies in compact groups because of the favorable conditions for interactions and mergers in these regions. The brightest of the blue elliptical galaxies has an extensive shell system; however, the other two blue elliptical galaxies for which we have sufficient spatial resolution show no unusual morphological features such as tails or shells. In addition to their color, the primary distinguishing feature of the blue elliptical galaxies is their color gradient, as they tend to be bluer in the center than at large radii, which is contrary to the usual trend in elliptical galaxies. C1 SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. USN OBSERV,DEPT ORBITAL MECH,WASHINGTON,DC 20392. RP ZEPF, SE (reprint author), JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,3700 SAN MARTIN DR,BALTIMORE,MD 21218, USA. NR 51 TC 69 Z9 69 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 DEC 20 PY 1991 VL 383 IS 2 BP 524 EP & DI 10.1086/170810 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GW194 UT WOS:A1991GW19400005 ER PT J AU GEORGE, C GILARDI, R FLIPPENANDERSON, JL AF GEORGE, C GILARDI, R FLIPPENANDERSON, JL TI STRUCTURES OF 1,2-ETHANEDIAMMONIUM DINITRATE (1) AND 1,3-PROPANEDIAMMONIUM DINITRATE (2) SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB (1): C2H10N22+.2NO3-, M(r) = 186.1, triclinic, P1BAR, a = 5.068 (1), b = 5.514 (4), c = 7.185 (3) angstrom, alpha = 105.03 (3), beta = 90.16 (3), gamma = 93.58 (4)-degrees, V = 193.5 (2) angstrom 3, Z = 1, D(x) = 1.597 Mg m-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 0.15 mm-1, F(000) = 98, T = 295 K, final R = 0.057, wR = 0.057 for 379 independent observed reflections. (2): C3H12N22+.2NO3-, M(r) = 200.2, monoclinic, Cc, a = 8.161 (1), b = 8.724 (2), c = 13.048 (2) angstrom, beta = 95.86 (1)-degrees, V = 924.2 (2) angstrom 3, Z = 4, D(x) = 1.439 Mg m-3, lambda(Cu K-alpha) = 1.54178 angstrom, mu = 0.12 mm-1, F(000) 424, T = 295 K, final R = 0.041, wR = 0.053 for 649 independent observed reflections. In (1) there is an inversion center midway between the two C atoms, and only half of the dication and one nitrate are crystallographically unique. In both (1) and (2) the dications are in a trans configuration and there is extensive intermolecular hydrogen bonding present, with each of the diammonium H atoms participating in moderate to weak hydrogen bonds. RP GEORGE, C (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 3 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 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD DEC 15 PY 1991 VL 47 BP 2713 EP 2715 DI 10.1107/S0108270191007977 PN 12 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA GY020 UT WOS:A1991GY02000083 ER PT J AU COHN, ML CAHILL, RA DEEG, HJ AF COHN, ML CAHILL, RA DEEG, HJ TI HEMATOPOIETIC RECONSTITUTION AND PREVENTION OF GRAFT-VERSUS-HOST DISEASE WITH UVB-IRRADIATED HAPLOIDENTICAL MURINE SPLEEN AND MARROW-CELLS SO BLOOD LA English DT Article ID BONE-MARROW; ULTRAVIOLET-IRRADIATION; HISTOCOMPATIBILITY BARRIERS; T-CELLS; TRANSPLANTATION; LYMPHOCYTES; ANTIBODY; ANTIGEN; MICE; ELIMINATION C1 FRED HUTCHINSON CANC RES CTR,DIV CLIN RES,TRANSPLANTAT BIOL PROGRAM,1124 COLUMBIA ST,SEATTLE,WA 98104. GEORGETOWN UNIV,DEPT PEDIAT,PROGRAM IMMUNOGENET,WASHINGTON,DC 20007. GEORGETOWN UNIV,DEPT PEDIAT,PROGRAM BONE MARROW TRANSPLANT,WASHINGTON,DC 20007. USN,MED RES INST,BETHESDA,MD 20814. RP DEEG, HJ (reprint author), FRED HUTCHINSON CANC RES CTR,DIV CLIN RES,TRANSPLANTAT BIOL PROGRAM,1124 COLUMBIA ST,SEATTLE,WA 98104, USA. FU NCI NIH HHS [CA31787, CA18221]; NHLBI NIH HHS [HL36444] NR 35 TC 24 Z9 24 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD DEC 15 PY 1991 VL 78 IS 12 BP 3317 EP 3322 PG 6 WC Hematology SC Hematology GA GV584 UT WOS:A1991GV58400031 PM 1683799 ER PT J AU SAKS, NS KLEIN, RB YOON, S GRISCOM, DL AF SAKS, NS KLEIN, RB YOON, S GRISCOM, DL TI FORMATION OF INTERFACE TRAPS IN METAL-OXIDE-SEMICONDUCTOR DEVICES DURING ISOCHRONAL ANNEALING AFTER IRRADIATION AT 78-K SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RADIOLYTIC MOLECULAR-HYDROGEN; SILICON DIOXIDE; MOS CAPACITORS; STATE GENERATION; TRAPPING CENTERS; POSITIVE CHARGE; TRANSISTORS; SIO2; TEMPERATURE; DEPENDENCE AB We have studied the mechanisms of interface trap (N(it)) formation in metal-oxide-semiconductor devices during isochronal annealing after irradiation at 78 K. Two distinct N(it) formation processes are observed at 120 and 250 K. After irradiation but before annealing, some samples were injected with electrons to remove all the radiation-induced positive oxide charges. In these samples, the N(it) formation process at 250 K is nearly eliminated, in agreement with previous reports, but the lower-temperature 120 K process increases substantially. Results are explained using a hydrogen model. We also discuss the use of substrate hot-electron injection, which is used to annihilate the radiation-induced positive charge, in some detail. RP SAKS, NS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 42 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 15 PY 1991 VL 70 IS 12 BP 7434 EP 7442 DI 10.1063/1.349739 PG 9 WC Physics, Applied SC Physics GA GW586 UT WOS:A1991GW58600032 ER PT J AU CAVALIERI, DJ CRAWFORD, JP DRINKWATER, MR EPPLER, DT FARMER, LD JENTZ, RR WACKERMAN, CC AF CAVALIERI, DJ CRAWFORD, JP DRINKWATER, MR EPPLER, DT FARMER, LD JENTZ, RR WACKERMAN, CC TI AIRCRAFT ACTIVE AND PASSIVE MICROWAVE VALIDATION OF SEA ICE CONCENTRATION FROM THE DEFENSE METEOROLOGICAL SATELLITE PROGRAM SPECIAL SENSOR MICROWAVE IMAGER SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID VARIABILITY; MODEL; ZONE; SNOW AB During March 1988 a series of coordinated special sensor microwave imager (SSM/I) underflights were carried out with NASA and Navy aircraft over portions of the Bering, Beaufort, and Chukchi seas as part of the NASA Defense Meteorological Satellite Program SSM/I Sea Ice Validation Program. The two Navy research aircraft, a Naval Research Laboratory P-3 with the NOARL K(a) band radiometric mapping system operating at 33.6 GHz and a Naval Air Development Center (NADC) P-3 with the NADC-Environmental Research Institute of Michigan (ERIM) C band synthetic aperture radar (SAR), provided wide-swath, high-resolution microwave imagery for direct comparison with sea ice concentrations calculated from SSM/I radiances using the NASA sea ice algorithm. Coincident measurements made with the Jet Propulsion Laboratory (JPL) C band SAR and the Goddard Space Flight Center (GSFC) aircraft multifrequency microwave radiometers (AMMR) on the NASA DC-8 airborne laboratory provided additional verification of the algorithm. NASA DC-8 AMMR data from Bering Sea ice edge crossings were used to verify that the ice edge location, defined as the position of the initial ice bands encountered by the aircraft, corresponds to an SSM/I ice concentration of 15%. Direct comparison of SSM/I and aircraft ice concentrations for regions having at least 80% aircraft coverage reveals that the SSM/I total ice concentration is lower on average by 2.4% +/- 2.4%. For multiyear ice, NASA and Navy flights across the Beaufort and Chukchi seas show that the SSM/I algorithm correctly maps the large-scale distribution of multiyear ice: the zone of first-year ice off the Alaskan coast, the large areas of mixed first-year and multiyear ice, and the region of predominantly multiyear ice north of the Canadian archipelago. Quantitative comparisons show that the SSM/I algorithm overestimates multiyear ice concentration by 12% +/- 11% on average in the Chukchi and Beaufort seas. Excluding data for a day which gave anomalously large positive biases, the multiyear ice concentration difference reduces to 5% +/- 4%, also indicating a positive SSM/I bias. Anomalously low SSM/I concentrations were found in the coastal zone north of Ellesmere Island. Differences between multiyear ice concentrations estimated from the JPL C band SAR imagery and from the GSFC AMMR radiances using an SSM/I type algorithm show that the AMMR concentrations are smaller on average by 6% +/- 14%. Sea ice conditions are described, and possible causes of the observed differences are discussed. C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. USN,OCEANOG & ATMOSPHER RES LAB,HANOVER,NH 03755. ENVIRONM RES INST MICHIGAN,RADAR SCI LAB,ANN ARBOR,MI 48107. RP CAVALIERI, DJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HYDROSHER PROC LAB,GREENBELT,MD 20771, USA. RI Drinkwater, Mark/C-2478-2011 OI Drinkwater, Mark/0000-0002-9250-3806 NR 32 TC 117 Z9 123 U1 1 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD DEC 15 PY 1991 VL 96 IS C12 BP 21989 EP 22008 DI 10.1029/91JC02335 PG 20 WC Oceanography SC Oceanography GA GW576 UT WOS:A1991GW57600003 ER PT J AU MAROM, M SHEMER, L THORNTON, EB AF MAROM, M SHEMER, L THORNTON, EB TI ENERGY DENSITY DIRECTIONAL SPECTRA OF A NEARSHORE WAVE FIELD MEASURED BY INTERFEROMETRIC SYNTHETIC APERTURE RADAR SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID OCEAN SURFACE; SAR IMAGERY; CURRENTS AB The nearshore wave field within Monterey Bay, California, is studied using remote sensing imaging by an interferometric synthetic aperture radar (INSAR) and simultaneous ground-based measurements. It is shown that INSAR imagery of the ocean surface offers some advantages over conventional synthetic aperture radar. Because of the direct imaging mechanism of INSAR, quantitative information about the complicated wave field can be obtained. The INSAR-derived directional energy density spectra and the corresponding ground-based spectra compare well. C1 TEL AVIV UNIV,DEPT FLUID MECH,IL-69978 TEL AVIV,ISRAEL. RP MAROM, M (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. RI Shemer, Lev/B-1143-2008 NR 21 TC 39 Z9 41 U1 3 U2 5 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 DEC 15 PY 1991 VL 96 IS C12 BP 22125 EP 22134 DI 10.1029/91JC02222 PG 10 WC Oceanography SC Oceanography GA GW576 UT WOS:A1991GW57600014 ER PT J AU JONES, BH MOOERS, CNK RIENECKER, MM STANTON, T WASHBURN, L AF JONES, BH MOOERS, CNK RIENECKER, MM STANTON, T WASHBURN, L TI CHEMICAL AND BIOLOGICAL STRUCTURE AND TRANSPORT OF A COOL FILAMENT ASSOCIATED WITH A JET-EDDY SYSTEM OFF NORTHERN CALIFORNIA IN JULY 1986 (OPTOMA21) SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID COASTAL SURFACE CURRENTS; SATELLITE-OBSERVATIONS; DRIFTER OBSERVATIONS; UPWELLING CENTER; PHYTOPLANKTON; VARIABILITY; FRONTS; EDDIES; CODE AB During the OPTOMA21 cruise, from July 7 to 19, 1986, the distributions of nutrient, pigment, bio-optical, and physical variables were mapped in a jet-eddy system located off Point Reyes and Point Arena, California. The goals of this mapping were to describe the three-dimensional variability of the filament and its relation to the nutrient and phytoplankton distributions offshore, to examine the interaction between the filament and coastal water, and to estimate the transport of nutrients and phytoplankton by the jet system. Several cool filaments were distinguishable at distances of more than 35-50 km from the coast in satellite imagery during this period. The juxtaposition of these features as well as the presence of an offshore anticyclone and a cyclone south of the filament anchored to the coast at Point Arena led to complex patterns in all variables, aided by the apparent alongshore variability in the source of upwelled water. The seaward jet associated with the filament entrained coastal upwelled water, with low temperatures and high nutrient and pigment concentrations, so that the filament maintained its characteristic low temperature and high chlorophyll in the offshore zone. The filament extended approximately 250 km offshore, where it made a cyclonic bend southeastward toward the coast. Salinity and nutrient concentrations generally increased across the filament into the cyclonic eddy circumscribed by the filament, although their fronts were not always coincident with temperature fronts. Chlorophyll fluorescence maxima were associated with the cool filament core, but elevated levels were also associated with the low-salinity, slightly warmer water on the outer edge of the filament along its entire track. Subduction within the filament resulted in elevated chlorophyll concentrations extending to approximately 100 m depth, nearly twice the estimated euphotic zone depth. Phytoplankton taxa within the filament were characteristic of those found within coastal upwelling regions. As was expected, the cyclonic eddy contained high salinity and high nutrient concentrations, but temperature at the surface was higher than was expected for the salinity, suggesting that there was little horizontal exchange between the cyclone and the cool filament and that the high-salinity water may have originated from local (open ocean) upwelling or it may have been displaced seaward from a near-coast origin several weeks earlier. The seaward jet associated with the filament resulted in a large transport of nutrients and phytoplankton biomass offshore, but the shoreward flow, downstream from the cyclonic bend, reduced the net transport to the offshore region. Shoreward nitrate transport was 85 to 90% of seaward transport, similar in proportion to the shoreward volume transport (approximately 90%) relative to the seaward volume transport. In contrast, shoreward chlorophyll transport was about 40% of seaward transport, indicating that the meandering jet may supply significant phytoplankton biomass to the offshore region. The meandering jet and filament system had a clear imprint on the chemical and biological structure of the region. This structure has implications to the fluxes of organic material in the region and it is probably significant in organizing the interactions among different trophic levels within the system. C1 UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,MIAMI,FL 33149. NASA,GODDARD SPACE FLIGHT CTR,OCEANS & ICE BRANCH,GREENBELT,MD 20771. USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. UNIV CALIF SANTA BARBARA,DEPT GEOG,SANTA BARBARA,CA 93106. RP JONES, BH (reprint author), UNIV SO CALIF,DEPT BIOL SCI,ALLAN HANCOCK FDN,ROOM 107,LOS ANGELES,CA 90089, USA. NR 36 TC 25 Z9 25 U1 0 U2 6 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 DEC 15 PY 1991 VL 96 IS C12 BP 22207 EP 22225 DI 10.1029/91JC02146 PG 19 WC Oceanography SC Oceanography GA GW576 UT WOS:A1991GW57600019 ER PT J AU MITRA, S STARK, JP AF MITRA, S STARK, JP TI ROLE OF VACANCIES AND IMPLANTATION DEFECTS IN GAAS/ALAS SUPERLATTICE INTERMIXING SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID GAAS SUPER-LATTICE; ALAS/GAAS SUPERLATTICE; ALAS; DIFFUSION; SI; INTERDIFFUSION; DISORDER AB Ga/Al intermixing in GaAs/AlAs superlattice (SL) structures is studied in the presence of an epitaxially grown dopant (Si) with and without the aid of vacancies. Rapid thermal annealing (900-degrees-C/20 min) after growth is insufficient to induce intermixing without the presence of excess vacancies as observed by Auger electron spectroscopy in conjunction with Ar ion sputtering. Vacancies themselves also enhance the intermixing process, and their role is explained with the recently proposed two-atom ring mechanism of diffusion. The effect of medium dose medium energy Be implantation into the SL is also studied using cross sectional transmission electron microscopy (XTEM). Two types of damage are observed, twins when liquid nitrogen (LN2) is used to cool the sample holder chamber, and high dislocation densities at room temperature conditions. Rapid thermal annealing effectively removes the twins but gives heavy intermixing in the case of the dislocation networks. C1 UNIV TEXAS,CTR MAT SCI & ENGN,AUSTIN,TX 78712. RP MITRA, S (reprint author), USN,POSTGRAD SCH,MAT SCI GRP,MONTEREY,CA 93943, USA. NR 21 TC 1 Z9 1 U1 1 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD DEC 15 PY 1991 VL 26 IS 24 BP 6650 EP 6654 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA GX648 UT WOS:A1991GX64800017 ER PT J AU GERBER, H AF GERBER, H TI SUPERSATURATION AND DROPLET SPECTRAL EVOLUTION IN FOG SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID RADIATION-FOG; CUMULUS CLOUDS; SCATTERING COEFFICIENTS; CONDENSATION THEORY; SIMPLE-MODEL; MICROPHYSICS; TURBULENCE; GROWTH; ENTRAINMENT; MICROSTRUCTURE AB Droplet sizes, larger than expected, and transient water vapor supersaturations were measured in radiation fog. Nongradient turbulent mixing of saturated air parcels at different temperatures and the release of excess vapor by molecular diffusion at the interface between the mixing parcels are suggested as the mechanisms causing the large supersaturations. Approximate agreement is found between calculated rates of change of supersaturation during nongradient mixing and the supersaturation measurements. A stochastic mixing model, based on the supersaturation and other measurements in the fogs, is used to estimate if nongradient mixing and transient supersaturations cause the appearance of large droplets. The model predicts a broadening of the droplet spectra to include no larger than midsized droplets. This study concludes that a form of nonlocal turbulence closure may be required in models to accurately describe microphysics in fogs and clouds when nongradient mixing is important. This mixing causes droplet broadening and activation of cloud condensation nuclei within fogs and clouds; the effect is both proportional to the temperature difference of mixing saturated air parcels and inversely proportional to the droplet integral radius. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 58 TC 39 Z9 42 U1 2 U2 11 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 DEC 15 PY 1991 VL 48 IS 24 BP 2569 EP 2588 DI 10.1175/1520-0469(1991)048<2569:SADSEI>2.0.CO;2 PG 20 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HA299 UT WOS:A1991HA29900003 ER PT J AU DUNCAN, MD MAHON, R TANKERSLEY, LL REINTJES, J AF DUNCAN, MD MAHON, R TANKERSLEY, LL REINTJES, J TI 2ND STOKES GENERATION IN DEUTERIUM AND HYDROGEN SO OPTICS COMMUNICATIONS LA English DT Article ID STIMULATED RAMAN-SCATTERING AB We have investigated the transient generation of second Stokes radiation in deuterium and hydrogen as a function of gas pressure and pump energy. We have measured the threshold energies for the first and second Stokes as a function of pressure and have found different behaviors for the second Stokes threshold in the high and low pressure regimes. We postulate that the different threshold behaviors are caused by the relative importance of four-wave mixing to the total second Stokes signal in the two regimes. Further data, based on the pulse energy statistics of the first and second Stokes, is presented that supports our postulate that the second Stokes seeding is dominated by four-wave mixing at low pressures and by amplified quantum noise at high gas pressures. Measurements of the spatial profiles of the second Stokes were also made and are consistent with this interpretation. C1 JAYCOR,VIENNA,VA 22180. USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP DUNCAN, MD (reprint author), USN,RES LAB,DIV OPT SCI,LASER PHYS BRANCH,CODE 6540,WASHINGTON,DC 20375, USA. NR 10 TC 7 Z9 7 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 DEC 15 PY 1991 VL 86 IS 6 BP 538 EP 546 DI 10.1016/0030-4018(91)90158-A PG 9 WC Optics SC Optics GA GY124 UT WOS:A1991GY12400018 ER PT J AU DULING, IN AF DULING, IN TI DISPERSION IN RARE-EARTH-DOPED FIBERS SO OPTICS LETTERS LA English DT Article ID INTERFEROMETRIC MEASUREMENTS; GROUP DELAY AB Rare-earth dopants in optical fibers have in general been ignored as a source of dispersion. The host material dispersion has been assumed to be an adequate description of the dispersion properties. Resonant dispersion features owing to absorption by the rare-earth ions were observed that were comparable in magnitude with the host material dispersion. These observations have consequences in the design of fiber lasers, nonlinear fiber transmission systems, and analog information systems. RP DULING, IN (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 3 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 DEC 15 PY 1991 VL 16 IS 24 BP 1947 EP 1948 DI 10.1364/OL.16.001947 PG 2 WC Optics SC Optics GA GY731 UT WOS:A1991GY73100012 PM 19784190 ER PT J AU BULSARA, AR SCHIEVE, WC AF BULSARA, AR SCHIEVE, WC TI SINGLE EFFECTIVE NEURON - MACROSCOPIC POTENTIAL AND NOISE-INDUCED BIFURCATIONS SO PHYSICAL REVIEW A LA English DT Article ID POSTPONED BIFURCATIONS; SWEPT PARAMETER; NETWORKS; BEHAVIOR; SYSTEMS; MODEL AB We consider a network of N symmetrically interconnected neutrons subject to additive as well as multiplicative (in the synaptic connections) noise. In a previous paper, the dynamics of a single neuron, in the presence of additive and multiplicative noise, was obtained through the procedure of adiabatic elimination. We analyze the macroscopic potential that describes the steady-state properties of this effective neuron, considering the effects of additive as well as multiplicative noise (in the synaptic connections). C1 UNIV TEXAS, DEPT PHYS, AUSTIN, TX 78712 USA. UNIV TEXAS, CTR STAT MECH, AUSTIN, TX 78712 USA. RP BULSARA, AR (reprint author), USN, CTR OCEAN SYST, MAT RES BRANCH, SAN DIEGO, CA 92152 USA. NR 22 TC 5 Z9 5 U1 1 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 15 PY 1991 VL 44 IS 12 BP 7913 EP 7922 DI 10.1103/PhysRevA.44.7913 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GW604 UT WOS:A1991GW60400013 ER PT J AU SOTO, MR PAGE, M MCKEE, ML AF SOTO, MR PAGE, M MCKEE, ML TI CONFIGURATION-INTERACTION CALCULATIONS OF STRUCTURES, VIBRATIONAL FREQUENCIES, AND HEATS OF FORMATION FOR HHNO SPECIES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID RADICALS; CHEMISTRY; NITROXIDE; MOLECULE; BARRIERS; SPECTRUM; NO AB We have used ab initio Hartree-Fock (HF) and configuration interaction (CI) methods to determine the structures, harmonic vibrational frequencies, and heats of formation for several stationary points on the potential energy surface of HHNO. All structures were fully optimized and vibrational frequencies determined at the frozen-core singles and doubles CI level (CISD) using a correlation consistent basis set with polarization functions. Using isogyric energy comparisons and single-point CISD energy calculations incorporating contracted Gaussian basis sets as large as (5s4p2d1f) on nitrogen and oxygen and (4s2p1d) on hydrogen, we predict the following: DELTA-H(f)298 (H2NO(2A')) = 16.2 kcal/mol, DELTA-H(f)298 (H2NO(2A")) = 47.1 kcal/mol, DELTA-H(f)298 (cis-HNOH) = 27.3 kcal/mol, DELTA-H(f)298 (trans-HNOH) = 22.0 kcal/mol. C1 AUBURN UNIV,DEPT CHEM,AUBURN,AL 36849. RP SOTO, MR (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,CODE 4410,WASHINGTON,DC 20375, USA. NR 31 TC 28 Z9 28 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD DEC 13 PY 1991 VL 187 IS 4 BP 335 EP 344 DI 10.1016/0009-2614(91)80263-W PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GX460 UT WOS:A1991GX46000001 ER PT J AU KHAN, HR FRANCAVILLA, T AF KHAN, HR FRANCAVILLA, T TI STRUCTURAL AND SUPERCONDUCTING PROPERTIES OF YBA2CU3-XALXO6+DELTA (0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.20) SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID ALUMINUM SUBSTITUTION; BA2YCU3O7 AB A series of YBa2Cu3-xAlxO6+delta (0 less-than-or-equal-to x less-than-or-equal-to 0.20) samples are prepared and their morphology and structural properties are investigated by scanning electron microscopy energy-dispersive X-ray analysis and X-ray diffraction techniques. Superconducting parameters are obtained from the a.c. magnetic susceptibility and critical current density measurements. Transformation to a tetragonal phase occurs for x greater-than-or-equal-to 0.2 and T(c) decreases strongly relative to the orthorhombic phase. A few degrees decrease of T(c) upon tetragonal phase transformation is consistent with the importance of Cu(2) planes for the superconductivity in these oxides. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. USN,RES LAB,WASHINGTON,DC 20375. RP KHAN, HR (reprint author), FORSCHUNGSINST EDELMETALLE & METALLCHEM,W-7070 SCHWABISCH GMUND,GERMANY. NR 9 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD DEC 13 PY 1991 VL 177 IS 2 BP 279 EP 284 DI 10.1016/0925-8388(91)90082-7 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA GX407 UT WOS:A1991GX40700014 ER PT J AU MCMORROW, D LOTSHAW, WT AF MCMORROW, D LOTSHAW, WT TI INTERMOLECULAR DYNAMICS IN ACETONITRILE PROBED WITH FEMTOSECOND FOURIER-TRANSFORM RAMAN-SPECTROSCOPY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID IMPULSIVE STIMULATED SCATTERING; TIME-RESOLVED FLUORESCENCE; OPTICAL KERR DYNAMICS; COMPUTER-SIMULATION; REORIENTATIONAL MOTION; LIQUID ACETONITRILE; RAYLEIGH-SCATTERING; SOLVATION DYNAMICS; MOLECULAR MOTIONS; PROTON-TRANSFER AB We present femtosecond optical heterodyne detected optical Kerr effect measurements of the transient birefringence of neat acetonitrile liquid. Using a recently developed Fourier transform analysis, the transient data are presented in both the time- and frequency-domain representations. The nuclear contributions to the transients, free from any distortions introduced by the electronic response, are generated from the frequency-domain data. The focus of this work is on the high-frequency dynamics associated with intermolecular vibrational degrees of freedom. We observe markedly nonexponential dynamics at short times, with the long-time relaxation characterized by an approximately 1.4-ps exponential time constant. The femtosecond dynamics exhibit characteristics of rapid inhomogeneous dephasing, which accounts for approximately 80% of the signal decay, as well as evidence for contributions from lower frequency, overdamped oscillators. The NLO intermolecular vibrational spectrum of acetonitrile exhibits a broad resonance with a band maximum of approximately 55 cm-1 and a bandwidth of approximately 100 cm-1. The femtosecond transients emphasize the role of the (microscopic) intermolecular potential energy surfaces in shaping the short-time vibrational aspects of the intermolecular dynamics in this liquid. The possible role of similar considerations in the short-time aspects of dynamic solvation phenomena is discussed. The manifestations of intermolecular vibrational motion in solvation transients have not yet been observed experimentally but are revealed clearly in recent molecular dynamics simulations. The correspondence between certain aspects of the two experiments is noted, and experimental questions associated with the observation of intermolecular vibrational modulation of solvation transients are discussed. C1 GE,RES & DEV,SCHENECTADY,NY 12301. RP MCMORROW, D (reprint author), USN,RES LAB,CODE 4613,WASHINGTON,DC 20375, USA. NR 93 TC 309 Z9 310 U1 1 U2 39 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 DEC 12 PY 1991 VL 95 IS 25 BP 10395 EP 10406 DI 10.1021/j100178a029 PG 12 WC Chemistry, Physical SC Chemistry GA GU911 UT WOS:A1991GU91100029 ER PT J AU DALLEK, S KABACOFF, L NORR, M AF DALLEK, S KABACOFF, L NORR, M TI OXIDATION-KINETICS OF TYPE-2A NATURAL DIAMOND [100] AND [111] SURFACES BY TG SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 19TH CONF OF THE NORTH AMERICAN THERMAL ANALYSIS SOC : INTERNATIONAL THERMAL ANALYSIS AND RESEARCH TRENDS CY SEP 23-26, 1990 CL BOSTON, MA SP N AMER THERMAL ANAL SOC AB The recent advances in the synthesis of deposited diamond films have resulted in renewed interest in the kinetics of oxidation of natural diamond on the various crystallographic faces. Data on [111] faces can be obtained only at small percentage conversions because the etched surfaces convert to [100] as the reaction proceeds. Oxidation of [100] faces is initiated at the site of defects and proceeds laterally along the surface rather than into the bulk. Flynn and Wall kinetics may be carried out on [100] faces, but allowances must be made for the fact that the initial density of defects will depend on sample preparation, particularly on the angle between the actual surface and the true [100] direction. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 3 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD DEC 12 PY 1991 VL 192 BP 321 EP 326 DI 10.1016/0040-6031(91)87171-R PG 6 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA GX538 UT WOS:A1991GX53800031 ER PT J AU KAHANER, DK AF KAHANER, DK TI INFORMATION-PROCESSING TECHNOLOGY IN JAPAN .2. SO APPLIED OPTICS LA English DT Editorial Material RP KAHANER, DK (reprint author), USN,RES ASIAN OFF,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD DEC 10 PY 1991 VL 30 IS 35 BP 5106 EP 5110 PG 5 WC Optics SC Optics GA GX773 UT WOS:A1991GX77300001 ER PT J AU BECK, SC FISCHER, J SMITH, HA AF BECK, SC FISCHER, J SMITH, HA TI INFRARED RECOMBINATION LINES OF HYDROGEN FROM YOUNG OBJECTS IN THE SOUTHERN GALACTIC PLANE SO ASTROPHYSICAL JOURNAL LA English DT Article DE INFRARED, SOURCES; INFRARED SPECTRA; STARS, PRE-MAIN-SEQUENCE; STARS, WINDS ID HERBIG-HARO OBJECTS; RADIO-CONTINUUM EMISSION; STELLAR OBJECTS; MILKY-WAY; REGIONS; STARS AB We have observed near infrared recombination lines of hydrogen in twelve young objects in the southern Galactic plane. The sample includes Herbig-Haro objects and IRAS dark cloud point sources from the 1987 catalog of Persson and Campbell. In four of the IRAS sources we have measured two or three infrared lines, and their intensity ratios are consistent with models of optically thick ionized winds. The intrinsic line shapes, which we retrieve from maximum entropy deconvolutions, indicate gas velocities of 100 km s-1 or more as expected from ionized winds. These sources are apparently embedded pre-main-sequence objects with outflows. They include some of the brightest known YSOs. C1 TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. TEL AVIV UNIV,WISE OBSERV,IL-69978 TEL AVIV,ISRAEL. USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP BECK, SC (reprint author), SMITHSONIAN INST,NATL AIR & SPACE MUSEUM,ASTROPHYS LAB,3726,WASHINGTON,DC 20560, USA. NR 32 TC 19 Z9 19 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 DEC 10 PY 1991 VL 383 IS 1 BP 336 EP 343 DI 10.1086/170791 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GT975 UT WOS:A1991GT97500034 ER PT J AU DAHLBURG, RB ANTIOCHOS, SK ZANG, TA AF DAHLBURG, RB ANTIOCHOS, SK ZANG, TA TI DYNAMICS OF SOLAR CORONAL MAGNETIC-FIELDS SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDROMAGNETICS; SUN, CORONA; SUN, MAGNETIC FIELDS ID MAGNETOHYDRODYNAMIC TURBULENCE; CURRENT SHEETS; PROMINENCES; MODEL; RECONNECTION; EVOLUTION; ERUPTION; REGIONS; ENERGY; FLARES AB Many aspects of solar activity are believed to be due to the stressing of the coronal magnetic field by footpoint motions at the photosphere. We present the results of a numerical simulation which, to our knowledge, is the first three-dimensional time-dependent simulation of footpoint stressing in a geometry appropriate for the corona. The numerical code generalizes to dissipative, incompressible MHD, a time-split method previously used for Navier-Stokes flows in channel geometry by Zang and Hussaini. We discretize space by a Fourier-Chebyshev collocation method, with a staggered grid used to avoid imposition of pressure boundary conditions. The velocity-vector potential intermediate step is performed with a low-storage third-order Runge-Kutta-Crank-Nicolson scheme. We consider an arcade that is initially current-free and impose a smooth footpoint motion that produces a twist in the field of approximately 2-pi. We then stop the photospheric motion and follow the evolution until the field relaxes, primarily by resistive diffusion, to another current-free state. We see no evidence for any instability, either ideal or resistive, during the complete simulation, and no evidence for current-sheet formation. The most striking feature of the evolution is that, in response to photospheric motions, the field expands rapidly upward to minimize the stress. We conclude that the expansion has two important effects. First, it suppresses the development of "dips" in the field that would be capable of supporting dense, cool material. At least for the motions that we assume, the magnetic field does not develop a geometry suitable for explaining prominence formation. Second, the expansion inhibits ideal instabilities such as kinking. Our results indicate that simple shearing of a single arcade is unlikely to lead to any significant manifestation of solar activity such as flares or prominences. We discuss effects that have not been included in the simulation and may possibly lead to such activity. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. RP DAHLBURG, RB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Antiochos, Spiro/D-4668-2012 OI Antiochos, Spiro/0000-0003-0176-4312 NR 36 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 DEC 10 PY 1991 VL 383 IS 1 BP 420 EP 430 DI 10.1086/170799 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GT975 UT WOS:A1991GT97500042 ER PT J AU WANG, YM SHEELEY, NR NASH, AG AF WANG, YM SHEELEY, NR NASH, AG TI A NEW SOLAR-CYCLE MODEL INCLUDING MERIDIONAL CIRCULATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDROMAGNETICS; SUN, ACTIVITY; SUN, INTERIOR; SUN, MAGNETIC FIELDS; SUN, ROTATION ID EPHEMERAL ACTIVE REGIONS; SUNS POLAR FIELDS; MAGNETIC-FIELDS; ROTATION; FLUX AB We present a kinematic model for the solar cycle which includes not only the transport of magnetic flux by supergranular diffusion and a poleward bulk flow at the Sun's surface, but also the effects of turbulent diffusion and an equatorward "return flow" beneath the surface. As in the earlier models of Babcock and Leighton, the rotational shearing of a subsurface poloidal field generates toroidal flux that erupts at the surface in the form of bipolar magnetic regions (BMRs). However, such eruptions do not result in any net loss of toroidal flux from the Sun (as assumed by Babcock and Leighton); instead, the large-scale toroidal field is destroyed both by "unwinding" as the local poloidal field reverses its polarity, and by diffusion as the toroidal flux is transported equatorward by the subsurface flow and merged with its opposite hemisphere counterpart. The inclusion of meridional circulation allows stable oscillations of the magnetic field, accompanied by the equatorward progression of flux eruptions, to be achieved even in the absence of a radial gradient in the angular velocity. We describe an illustrative case in which a subsurface flow speed of order 1 m s-1 and subsurface diffusion rate of order 10 km2 s-1 yield 22 yr oscillations in qualitative agreement with observations. RP WANG, YM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4172,WASHINGTON,DC 20375, USA. NR 21 TC 167 Z9 170 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 DEC 10 PY 1991 VL 383 IS 1 BP 431 EP 442 DI 10.1086/170800 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GT975 UT WOS:A1991GT97500043 ER PT J AU QADRI, SB SKELTON, EF KIM, C HARFORD, MZ LUBITZ, P AF QADRI, SB SKELTON, EF KIM, C HARFORD, MZ LUBITZ, P TI ELECTRON-BEAM DEPOSITION OF ZIRCONIA FILMS STABILIZED IN HIGH-TEMPERATURE PHASES BY DIFFERENT OXIDES SO SURFACE & COATINGS TECHNOLOGY LA English DT Article ID SOLID-SOLUTIONS; THIN-FILMS; SYSTEM AB Films of ZrO2-X2O3 where X = Al, In, and Sc and of ZrO2-SnO2 were deposited by simultaneous electron-beam evaporation of the respective metal oxides. Films deposited onto substrates at room temperature were initially amorphous, but were transformed and stabilized in either the tetragonal or cubic phases of ZrO2 by annealing at appropriate temperatures over certain ranges of compositions. In the case of the ZrO2-In2O3 system, for example, the substrate was heated to 300-degrees-C during deposition and the ZrO2 was recovered in the cubic phase for indium compositions varying between 3.5 and 11 at.%. However, in the ZrO2-SnO2 system, the as-deposited film remained amorphous (even though the substrate was held at 300-degrees-C). Results of the effect of composition on lattice parameters and phase stability are reviewed and discussed. C1 SACHS FREEMAN ASSOCIATES INC, LANDOVER, MD 20785 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 15 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 67 EP 70 DI 10.1016/0257-8972(91)90033-S PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100013 ER PT J AU QADRI, SB KIM, C TWIGG, M HARFORD, M LUBITZ, P AF QADRI, SB KIM, C TWIGG, M HARFORD, M LUBITZ, P TI STRUCTURAL AND MAGNETIC-PROPERTIES OF A1/FE MULTILAYERS DEPOSITED BY ION-BEAM SPUTTERING SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS ID FILMS AB Al/Fe multilayers were deposited using an ion-assisted ion-beam sputtering technique. X-ray diffraction at high angles showed peaks corresponding to the aluminum f.c.c. phase with a lattice parameter equal to that of bulk aluminum. Peaks from the iron b.c.c. phase were observed and the lattice parameter based on these peaks was calculated to be 2.94 angstrom. The absence of satellite peaks is attributed to the small grain size. The low angle diffraction pattern showed three orders of peaks. Investigation of the magnetic properties using a vibrating sample magnetometer and ferromagnetic resonance showed a moderately reduced moment for iron when compared with bulk iron. RP QADRI, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 U1 2 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 139 EP 142 DI 10.1016/0257-8972(91)90045-X PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100025 ER PT J AU KIM, C QADRI, SB TRITT, TM EHRLICH, AC HUES, SM JACOBSEN, RL KUMAR, S GRIMSDITCH, M AF KIM, C QADRI, SB TRITT, TM EHRLICH, AC HUES, SM JACOBSEN, RL KUMAR, S GRIMSDITCH, M TI STRUCTURAL, ELASTIC AND TRANSPORT-PROPERTIES OF AG/AL MULTILAYER THIN-FILMS PREPARED BY ION-BEAM SPUTTERING SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS ID SURFACE ACOUSTIC-WAVES; METALLIC SUPERLATTICES; MECHANICAL-PROPERTIES; FOILS; PALLADIUM; MODULUS; NICKEL AB Multilayers of Ag/Al with composition modulation wavelengths lambda between 13.5 and 210 angstrom were deposited onto silicon substrates using ion-beam sputtering. X-ray diffraction scans showed well defined small angle peaks and satellite peaks at high angles indicating coherent multilayers. The average lattice parameter showed a 1.1% reduction with decreasing modulation wavelengths from 90 to 25 angstrom. Brillouin-scattering measurements showed a moderate 5% enhancement of surface velocity (elastic constant) with decreasing wavelengths. This elastic hardening and interplanar structural contraction may be partially attributed to the observed formation of Ag2Al at the multilayer interfaces. Although deposited only 10 from a normal incidence, the electrical resistivities, measured between 77 and 300 K in a van der Pauw configuration, showed a temperature independent in-plane anisotropy of up to 90% and the room temperature resistivity was an order of magnitude greater than expected from the bulk average. The temperature coefficient of resistivity showed a "U" shaped dependence with lambda and the lower up turn occurred at lambda almost-equal-to 50 angstrom. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP KIM, C (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 32 TC 8 Z9 8 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 143 EP 149 DI 10.1016/0257-8972(91)90046-Y PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100026 ER PT J AU SINGER, IL AF SINGER, IL TI A THERMOCHEMICAL MODEL FOR ANALYZING LOW WEAR-RATE MATERIALS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM TECHNOL, AMER VACUUM SOC, DIV THIN FILMS ID THIN-FILM; FRICTION BEHAVIOR; SURFACE-CHEMISTRY; OXIDATIONAL WEAR; 52100 STEEL; IMPLANTATION AB Thermochemical analysis was used to describe chemical reactions that take place during the wear in air of several low wear surface treatments. The reactions effect oxidation of surfaces and transfer layers, adhesion of transfer layers, and debris formation. Surface treatments studied include MoS2 films, TiN and TiC coatings, and steel implanted with Ti+ and (Ti+ + C+). Surface chemical and structural techniques were used to analyze the interfacial films and wear debris produced during dry sliding wear tests at or near room temperature. Ternary and quaternary phase diagrams calculated (for the most part) from thermochemical data are shown to be in agreement with compositions and phases determined experimentally. Speculations are given on why thermochemistry applies to wear behavior and how this modeling approach may be used to design beneficial surface treatments. RP SINGER, IL (reprint author), USN,RES LAB,CODE 6170,WASHINGTON,DC 20375, USA. NR 46 TC 44 Z9 44 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 10 PY 1991 VL 49 IS 1-3 BP 474 EP 481 DI 10.1016/0257-8972(91)90103-4 PG 8 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GX591 UT WOS:A1991GX59100083 ER PT J AU MA, DI QADRI, SB PECKERAR, MC MCCARTHY, D AF MA, DI QADRI, SB PECKERAR, MC MCCARTHY, D TI DOUBLE-CRYSTAL X-RAY TOPOGRAPHY CHARACTERIZATION OF AN ELECTRICAL-BIAS-INDUCED STRESS VARIATION IN METAL-OXIDE SEMICONDUCTOR FIELD-EFFECT TRANSISTORS SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID SILICON; DISLOCATIONS AB n-channel metal-oxide-semiconductor (MOS) field effect transistors were biased under different operating conditions. Superficial silicon strain patterns were recorded by reflection mode double-crystal topography. Stress redistributions caused by various applied electrical field E biases were observed. A comparison of the electrical-field-induced stress and mechanically induced stress was made. On the basis of this result, the amount of bias-induced stress was measured. X-ray peak reflection intensity, the diffraction angle of this peak, and the full width at half-maximum of the X-ray double-crystal rocking curves under various biases were also analyzed. All of these measurements indicate that a weak piezoelectric effect exists in the superficial layers of MOS devices. C1 UNIV MARYLAND,COLLEGE PK,MD 20742. RP MA, DI (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 28 TC 1 Z9 1 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 10 PY 1991 VL 206 IS 1-2 BP 18 EP 26 DI 10.1016/0040-6090(91)90387-D PG 9 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200004 ER PT J AU MA, DI CAMPISI, GJ QADRI, SB PECKERAR, MC AF MA, DI CAMPISI, GJ QADRI, SB PECKERAR, MC TI CHARACTERIZATION OF SILICON ON INSULATOR SUBSTRATES USING REFLECTION MODE DOUBLE-CRYSTAL X-RAY TOPOGRAPHY SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID ZONE-MELTING-RECRYSTALLIZATION; OXYGEN IMPLANTATION; POROUS SILICON; FILMS; SI AB The strain distributions of various silicon-on-insulator (SOI) wafers were studied using Bragg reflection mode double-crystal topography analysis. These SOI samples included the separation by implanted oxygen (SIMOX), the zone melt recrystallization (ZMR), and the bond and etch-back silicon-on-insulator (BESOI). The inherent warpage of each SOI sample was revealed by X-ray double-crystal topography (DCT). Dislocation loops and surface-terminating defects were also observed on the ZMR sample. The defect density was evaluated by double-crystal rocking curve (DCRC) analysis using a symmetric (004) set-up. The relative peak intensities and full width at half maxima (FWHM) were measured. The quality of superficial silicon layers of most SOI wafers was similar to the quality of a single-crystal silicon, except the ZMR sample. According to these analyses, SIMOX wafers provide the best single-crystal quality and consistent lattice characteristics under various fabrication processes. C1 UNIV MARYLAND,COLLEGE PK,MD 20742. RP MA, DI (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 29 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 10 PY 1991 VL 206 IS 1-2 BP 27 EP 33 DI 10.1016/0040-6090(91)90388-E PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200005 ER PT J AU PELLEGRINO, J QADRI, S TSENG, W COMAS, J AF PELLEGRINO, J QADRI, S TSENG, W COMAS, J TI PERIODICITIES ASSOCIATED WITH LOW-ORDER ALAS/GAAS SUPERLATTICES SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID X-RAY-DIFFRACTION AB The use of molecular beam epitaxy to produce heterostructures has made it possible to better study superlattices with monolayer and submonolayer period spacings. In this work we examine the physical properties for the superlattice system (GaAs)n1(AlAs)n2/GaAs(001) for low values of n1 and n2, i.e. n1 = n2 = 3.6,12. Normal, interrupted growth, and migration-enhanced epitaxy growth techniques were used to grow the superlattice structures and the X-ray diffraction spectra were obtained and the major and satellite peak positions analyzed. An analysis of the major diffraction peaks and their associated satellites exhibited superlattice periodicity in good agreement with theory. Diffraction peaks were also observed in regions adjacent to the primary diffraction peaks which did not occur in the expected satellite positions. An analysis of these peaks relative to the primary peaks indicates periodicities which are greater than the intended period. One possible cause for these periodicities is variations in growth conditions which occur while the superlattice is being grown. An understanding of low-order superlattices is important for structures which are dependent on interface sharpness. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PELLEGRINO, J (reprint author), NATL INST STAND & TECHNOL,BLDG 225,RM A-305,GAITHERSBURG,MD 20899, USA. NR 8 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 10 PY 1991 VL 206 IS 1-2 BP 40 EP 46 DI 10.1016/0040-6090(91)90390-J PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200007 ER PT J AU CHRISEY, DB HORWITZ, JS LEUCHTNER, RE AF CHRISEY, DB HORWITZ, JS LEUCHTNER, RE TI EXCIMER LASER ABLATION OF A YBA2CU3O7-DELTA TARGET IN A VACUUM - CHARACTERIZATION OF THE MASS AND ENERGY OF EJECTED MATERIAL SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID SUPERCONDUCTING THIN-FILMS; DEPOSITION; SPECTROSCOPY; PRESSURE; SPECTRA; SYSTEM AB A quadrupole mass spectrometer has been used to measure the mass and energy distributions of neutral material ejected in the laser vaporization of a YBa2CU3O7-delta target in vacuum under geometry and laser conditions relevant to the pulsed laser deposition for film growth. All metal atoms as well as common metal oxides were observed. The time-of-flight (TOF) energy distributions showed large populations of species having energies between 10 and 100 eV. The shapes of the TOF energy spectra did not lend themselves to the application of simple models for the event. RP CHRISEY, DB (reprint author), USN,RES LAB,CODE 4670,WASHINGTON,DC 20375, USA. NR 18 TC 25 Z9 25 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 10 PY 1991 VL 206 IS 1-2 BP 111 EP 115 DI 10.1016/0040-6090(91)90402-J PG 5 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200019 ER PT J AU DESISTO, WJ HENRY, RL OSOFSKY, M MARZIK, JV AF DESISTO, WJ HENRY, RL OSOFSKY, M MARZIK, JV TI YBA2CU3O7-DELTA THIN-FILMS DEPOSITED BY AN ULTRASONIC NEBULIZATION AND PYROLYSIS METHOD SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID CHEMICAL VAPOR-DEPOSITION; TC SUPERCONDUCTING FILMS; SPRAY PYROLYSIS; TARGET; GROWTH AB High T(c) superconducting Films of YBa2Cu3O7-delta were deposited by a novel chemical vapor deposition procedure. 1-butanol solutions of the volatile yttrium, barium and copper derivatives of 2,2,6,6-tetramethyl-3,5-heptanedione were ultrasonically nebulized and pyrolyzed onto MgO substrates at 430-degrees-C. The solutions were nebulized with "soft spray" ultrasonic nozzles operating at 60 and 120 kHz giving median droplet sizes of 19 and 10-mu-m respectively. Experimental parameters affecting film composition are discussed. The as-deposited films were poorly crystalline. Annealing the films in flowing argon at 830-degrees-C, was followed by a short anneal in O2 at 880-degrees-C and slow cooling in O2. The films were metallic with T(c) values as high as 80-81 K (R = 0). Films were characterized by X-ray diffraction, optical and scanning electron microscopy, elastic backscattering and transport measurements. C1 USA,MAT TECHNOL LAB,WATERTOWN,MA 02172. RP DESISTO, WJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 7 Z9 7 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 10 PY 1991 VL 206 IS 1-2 BP 128 EP 131 DI 10.1016/0040-6090(91)90406-N PG 4 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200023 ER PT J AU HARRISON, JA BRENNER, DW WHITE, CT COLTON, RJ AF HARRISON, JA BRENNER, DW WHITE, CT COLTON, RJ TI ATOMISTIC MECHANISMS OF ADHESION AND COMPRESSION OF DIAMOND SURFACES SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID FORCE MICROSCOPE; MOLECULAR-DYNAMICS; SCALE FRICTION; TUNGSTEN TIP; FILMS AB The interactions which occur when two diamond {111} surfaces come into contact for short times have been examined via molecular dynamics. When both surfaces are hydrogen terminated these surfaces can be brought into contact, compressed, and separated with no damage to either surface. After compression and subsequent separation the surfaces and the bulk lattice regain their original geometry. The same is true if the hydrogen surface layer is totally removed from one of the lattices. In contrast, when both surfaces are partially hydrogen terminated, contact followed by compression and retraction results in the transfer of hydrogen atoms and the formation of a connective link of carbon atoms between surfaces. The formation of this connective neck of atoms and its subsequent fracture lead to significant damage to the surface and subsurface layers of the lattices. RP HARRISON, JA (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 17 TC 45 Z9 45 U1 1 U2 7 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 10 PY 1991 VL 206 IS 1-2 BP 213 EP 219 DI 10.1016/0040-6090(91)90424-V PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200041 ER PT J AU BRENNER, DW HARRISON, JA WHITE, CT COLTON, RJ AF BRENNER, DW HARRISON, JA WHITE, CT COLTON, RJ TI MOLECULAR-DYNAMICS SIMULATIONS OF THE NANOMETER-SCALE MECHANICAL-PROPERTIES OF COMPRESSED BUCKMINSTERFULLERENE SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 22-26, 1991 CL SAN DIEGO, CA ID VIBRATIONAL RAMAN-SPECTRA; PURIFIED SOLID FILMS; ICOSAHEDRAL SYMMETRY; FULLERENES C-60; 3RD FORM; CARBON; C-70; SEPARATION; C60 AB Molecular dynamics simulation techniques and an analytic many-body potential function have been used to study a spherical C60 cluster ("Buckminsterfullerene") compressed between graphite planes. We find that the Cluster can reversibly deform under anisotropic compression to a radius (in the direction of compression) that is 1/3 that of the uncompressed cluster. On compression the restoring pressure first rises and then exhibits a distinct drop beginning at a pressure of about 3 GPa. This drop in pressure is a result of a reversible change which occurs when the cluster transforms to a disc-like structure. Further compression results in a rise in pressure with a slope different from the initial compression. RP BRENNER, DW (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 19 TC 156 Z9 160 U1 0 U2 14 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 10 PY 1991 VL 206 IS 1-2 BP 220 EP 223 DI 10.1016/0040-6090(91)90425-W PG 4 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GZ322 UT WOS:A1991GZ32200042 ER PT J AU HAGAN, KJ AF HAGAN, KJ TI THE PACIFIC-CAMPAIGN, WORLD-WAR-II - THE UNITED-STATES-JAPANESE NAVAL WAR, 1941-1945 - VANDERVAT,D SO NEW YORK TIMES BOOK REVIEW LA English DT Book Review RP HAGAN, KJ (reprint author), USN ACAD,MUSEUM,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK TIMES PI NEW YORK PA 229 W 43RD ST, NEW YORK, NY 10036-3959 SN 0028-7806 J9 NEW YORK TIMES BK R JI N. Y. Times Book Rev. PD DEC 8 PY 1991 BP 15 EP 16 PG 2 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA GR768 UT WOS:A1991GR76800016 ER PT J AU MRSTIK, BJ RENDELL, RW AF MRSTIK, BJ RENDELL, RW TI MODEL FOR SI-SIO2 INTERFACE STATE FORMATION DURING IRRADIATION AND DURING POSTIRRADIATION EXPOSURE TO HYDROGEN ENVIRONMENT SO APPLIED PHYSICS LETTERS LA English DT Article ID SILICON DIOXIDE; TRAPPED HOLES; CAPACITORS; ELECTRONS; DEVICES; CHARGE AB When the oxide of a previously x-ray irradiated metal-oxide-semiconductor field-effect transistor is exposed to a hydrogen environment at room temperature the number of inter-face traps is observed to double, and the number of fixed oxide traps to decrease by a similar amount. From an analysis of this post-irradiation behavior we derive a model for the formation of interface states during and immediately after irradiation. In this model holes formed in the oxide during the irradiation split = SiH bonds in the oxide to form atomic hydrogen and = Si+. At room temperature the atomic hydrogen quickly dimerize to form H-2. The H-2 is then cracked by the = Si+ to form H+. Each H+ is transported to the interface, where it forms an interface state. This model also explains the results of a recent experiment which had seemed to indicate that no H+ was formed in the oxide as a result of irradiation. RP MRSTIK, BJ (reprint author), USN,RES LAB,CODE 6810,WASHINGTON,DC 20375, USA. NR 21 TC 14 Z9 18 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 2 PY 1991 VL 59 IS 23 BP 3012 EP 3014 DI 10.1063/1.105801 PG 3 WC Physics, Applied SC Physics GA GT017 UT WOS:A1991GT01700031 ER PT J AU POND, JM CARROLL, KR HORWITZ, JS CHRISEY, DB OSOFSKY, MS CESTONE, VC AF POND, JM CARROLL, KR HORWITZ, JS CHRISEY, DB OSOFSKY, MS CESTONE, VC TI PENETRATION DEPTH AND MICROWAVE LOSS MEASUREMENTS WITH A YBA2CU3O7-DELTA/LAALO3/YBA2CU3O7-DELTA TRILAYER TRANSMISSION-LINE SO APPLIED PHYSICS LETTERS LA English DT Article ID YBA2CU3O7-DELTA; FILMS AB A trilayer YBa2Cu3O7-delta/LaAlO3/YBa2Cu3O7-delta transmission line was fabricated to measure the penetration depth of the high-temperature superconducting layers, to determine the microwave losses, and to demonstrate the potential for practical high-temperature superconductor multilayer microwave circuits. All layers were deposited onto a (100) MgO substrate by pulsed laser deposition. The superconducting films are c-axis oriented with critical temperatures of 89 K. From the phase velocity measurements, the penetration depth was found to be consistent with weak-coupled BCS theory in the local limit with a zero-temperature value of 135 nm. A simple phenomenological temperature dependence for the penetration depth is also presented. This successful trilayer fabrication process, besides allowing the determination of the penetration depth and microwave loss, also expands the possible applications of the high-temperature superconductors. RP POND, JM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 20 TC 99 Z9 100 U1 2 U2 8 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 2 PY 1991 VL 59 IS 23 BP 3033 EP 3035 DI 10.1063/1.105784 PG 3 WC Physics, Applied SC Physics GA GT017 UT WOS:A1991GT01700038 ER PT J AU PATNAIK, G KAILASANATH, K ORAN, ES AF PATNAIK, G KAILASANATH, K ORAN, ES TI EFFECT OF GRAVITY ON FLAME INSTABILITIES IN PREMIXED GASES SO AIAA JOURNAL LA English DT Article ID CELLULAR FLAMES; EXTINCTION; LAMINAR AB The effects of gravity on instabilities in laminar, premixed names in dilute H2-O2-N2 mixtures is investigated using detailed, time-dependent, two-dimensional numerical simulations. The physical processes included in the model are fluid convection, detailed hydrogen-oxygen chemistry, multispecies diffusion, thermal conduction, viscosity, and gravity. The results from the simulations show that the effects of gravity become more important as the burning velocity of a mixture is decreased by either decreasing the amount of fuel or increasing the amount of diluent. In a 1.5:1:10 hydrogen-oxygen-nitrogen mixture with a burning velocity of 9.9 cm/s, gravity plays only a secondary role in determining the multidimensional structure of the name, and the stability and structure of the flame is controlled primarily by the thermodiffusive instability mechanism. However, in a 1:1:10 hydrogen-oxygen-nitrogen mixture, in which the burning velocity is 2.0 cm/s, gravity is more important. Here the upward-propagating name is highly curved and evolves into a bubble rising upward in the tube; the zero-gravity flame shows a cellular structure; and the downward-propagating flame oscillates between structures with concave and convex curvatures toward the unburned mixture. These observations are explained on the basis of an interaction between the processes leading to buoyancy-induced Rayleigh-Taylor instability and the thermodiffusive instability. Flames in a 1:1:6.3 mixture, which has essentially the same burning velocity as the 1.5:1:10 mixture, show some effects of gravity, indicating that burning velocity is not the only parameter determining the sensitivity of a mixture to the effects of gravity. C1 BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22151. USN,COMP PHYS & FLUID DYNAM LAB,CTR REACT FLOW & DYNAM SYST,WASHINGTON,DC 20375. NR 36 TC 8 Z9 9 U1 2 U2 4 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 DEC PY 1991 VL 29 IS 12 BP 2141 EP 2148 DI 10.2514/3.10851 PG 8 WC Engineering, Aerospace SC Engineering GA GX692 UT WOS:A1991GX69200017 ER PT J AU GUTMARK, E PARR, TP HANSONPARR, DM SCHADOW, KC AF GUTMARK, E PARR, TP HANSONPARR, DM SCHADOW, KC TI CLOSED-LOOP AMPLITUDE-MODULATION CONTROL OF REACTING PREMIXED TURBULENT JET SO AIAA JOURNAL LA English DT Article ID ACTIVE CONTROL; COMBUSTION AB A closed-loop control system was constructed to control the initiation of reaction in a turbulent fuel/air jet at the lean flammability limit. Control authority was obtained by forcing the initial shear layer of the fuel/air mixture, thus generating small-scale vortices which improved the flame stability. The optimal forcing frequency was determined in open-loop control tests, which defined the effective range and related it to the Kelvin-Helmholtz instability of the shear layer. An amplitude modulation (AM) controller was developed using the open-loop frequency as a carrier signal. Bode and Nyquist analyses showed that the reaction is stable only in a limited range due to time lag related to the convection time of the vortices. In spite of the high noise level of this turbulent combustion system, it was possible to use linear control theory to analyze the time-averaged transfer functions. The application of lead and lag compensations was studied to extend the stability margins. The control system response to changes in operating conditions such as set-point and flow rates were compared to the open-loop control operation and found to be superior. RP GUTMARK, E (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. OI Gutmark, Ephraim/0000-0001-7816-4257 NR 17 TC 18 Z9 18 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 DEC PY 1991 VL 29 IS 12 BP 2155 EP 2162 DI 10.2514/3.10853 PG 8 WC Engineering, Aerospace SC Engineering GA GX692 UT WOS:A1991GX69200019 ER PT J AU CHIPMAN, SF MARSHALL, SP SCOTT, PA AF CHIPMAN, SF MARSHALL, SP SCOTT, PA TI CONTENT EFFECTS ON WORD PROBLEM PERFORMANCE - A POSSIBLE SOURCE OF TEST BIAS SO AMERICAN EDUCATIONAL RESEARCH JOURNAL LA English DT Article ID GENDER DIFFERENCES; MATHEMATICS; METAANALYSIS; ACHIEVEMENT AB Gender differences in mathematics test performance that favor males are rarely found on tests of computation or other mathematical symbol manipulations. These differences appear primarily in tests that are labeled as tests of "mathematical reasoning" and consist largely of word problems. The content of the word problems' cover stories is a possible source of gender bias. Some have suggested that students are discouraged from solving problems for affective reasons when the content of the problem is sex-typed for the opposite sex; cognitive science research on problem-solving processes suggests that familiarity of content would be likely to affect problem-solving performance. To test these hypotheses, an experiment was conducted in which underlying mathematics problems were clothed in four different cover stories: masculine, feminine, neutral familiar, and neutral unfamiliar. No effect of sex-typing was found; there was a highly significant but small effect of familiarity. Ratings of problem characteristics were also collected, primarily to guide and confirm the realization of the design intentions. C1 SAN DIEGO STATE UNIV,CTR RES MATH & SCI EDUC,SAN DIEGO,CA 92120. SAN DIEGO STATE UNIV,DEPT PSYCHOL,SAN DIEGO,CA 92182. RP CHIPMAN, SF (reprint author), USN,OFF RES,PROGRAM COGNIT SCI,CODE 1142CS,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 32 TC 7 Z9 7 U1 0 U2 1 PU AMER EDUCATIONAL RESEARCH ASSOC PI WASHINGTON PA 1230 17TH ST NW, WASHINGTON, DC 20036-3078 SN 0002-8312 J9 AM EDUC RES J JI Am. Educ. Res. J. PD WIN PY 1991 VL 28 IS 4 BP 897 EP 915 DI 10.3102/00028312028004897 PG 19 WC Education & Educational Research SC Education & Educational Research GA GW892 UT WOS:A1991GW89200009 ER PT J AU SCOTT, DA CORWIN, AL CONSTANTINE, NT OMAR, MA GULED, A YUSEF, M ROBERTS, CR WATTS, DM AF SCOTT, DA CORWIN, AL CONSTANTINE, NT OMAR, MA GULED, A YUSEF, M ROBERTS, CR WATTS, DM TI LOW PREVALENCE OF HUMAN IMMUNODEFICIENCY VIRUS-1 (HIV-1), HIV-2, AND HUMAN T-CELL LYMPHOTROPIC VIRUS-1 INFECTION IN SOMALIA SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID HTLV-I ANTIBODIES; LEUKEMIA-VIRUS; AFRICA; AIDS; MEN; POPULATIONS; DJIBOUTI; TYPE-1; RISK AB A seroepidemiologic survey was conducted to determine the prevalence of human immunodeficiency virus type 1 (HIV-1), HIV-2, human T cell lymphotropic virus type I (HTLV-I), and Treponema pallidum infection among southern Somalis. Sera were collected from 1, 269 study subjects in the urban area of the capital city, Mogadishu, and in the rural towns of Merka, Qoryoley, and Kismayo. The subjects included 57 prostitutes, 79 sexually transmitted disease (STD) patients, and 1, 133 others, including outpatient and hospitalized patients with leprosy, tuberculosis, other infectious diseases, individuals from rehabilitation camps and secondary schools, and Ethiopian immigrants. Results indicated that none of the sera were positive for HIV-1 and HIV-2 by Western blot, but one was positive for HTLV-1. The prostitutes had a significantly higher prevalence of treponemal antibody (50.8%; P < 0.0001) than either the STD patients (12.6%) or the other subjects (5.2%). Epidemiologic data indicated that 94% of the males and females were circumcised and only 2.6% of the males used condoms. Overall, the results of this study suggested a very low prevalence of HIV-1, HIV-2, and HTLV-I infections, especially among prostitutes and STD patients, who were considered at greatest risk of contracting these retroviral infections. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. MINIST HLTH,STD PROJECT,MUQDISHO,SOMALIA. WALTER REED ARMY MED CTR,DIV RETROVIROL,WASHINGTON,DC 20307. NR 25 TC 18 Z9 18 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 DEC PY 1991 VL 45 IS 6 BP 653 EP 659 PG 7 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA HA015 UT WOS:A1991HA01500001 PM 1763791 ER PT J AU SIPPEL, JE GIRGIS, NI AF SIPPEL, JE GIRGIS, NI TI DETECTION OF IGM ANTIBODIES TO NEISSERIA-MENINGITIDIS GROUP A POLYSACCHARIDE IN MENINGITIS PATIENTS BY DIRECT AND ANTIBODY CAPTURE ENZYME-LINKED IMMUNOSORBENT ASSAYS SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID CAPSULAR POLYSACCHARIDE; MENINGOCOCCAL DISEASE; IMMUNOGLOBULIN-G; GROUP-A; INFECTION; ANTIGENS; ELISA AB Serum specimens obtained from culture-positive group A meningococcal meningitis patients in Cairo, Egypt were tested for immunoglobulin M (IgM) antibodies to Neisseria meningitidis group A polysaccharide by direct and IgM capture enzyme-linked immunosorbent assays (ELISAs). Sera from patients with meningitis caused by other bacteria were used as negative control specimens. The IgM antibodies to this antigen were detected by direct ELISA in 93% of 58 specimens obtained from patients with group A meningococcal disease three or more days after hospital admission, and by IgM capture ELISA in 83% of 60 such specimens. Sixteen percent of 25 specimens obtained three or more days after admission from negative control patients were positive by direct ELISA, and 4% were positive by IgM capture ELISA. The correlation coefficient of the results with the two assays was 0.85. C1 USN,MED RES INST,BETHESDA,MD 20814. USN,MED RES UNIT 3,CAIRO,EGYPT. RP SIPPEL, JE (reprint author), MERCER UNIV,SCH MED,MACON,GA 31207, USA. NR 21 TC 2 Z9 2 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 DEC PY 1991 VL 45 IS 6 BP 676 EP 682 PG 7 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA HA015 UT WOS:A1991HA01500005 PM 1763793 ER PT J AU WALKER, WA MAGUIRE, FE AF WALKER, WA MAGUIRE, FE TI VAGAL SCHWANNOMA SO ANNALS OF THORACIC SURGERY LA English DT Letter C1 USN HOSP,SAN DIEGO,CA 92134. RP WALKER, WA (reprint author), UNIV TENNESSEE CTR HLTH SCI,DEPT SURG,956 COURT AVE,MEMPHIS,TN 38163, USA. NR 1 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0003-4975 J9 ANN THORAC SURG JI Ann. Thorac. Surg. PD DEC PY 1991 VL 52 IS 6 BP 1370 EP 1371 PG 2 WC Cardiac & Cardiovascular Systems; Respiratory System; Surgery SC Cardiovascular System & Cardiology; Respiratory System; Surgery GA GY251 UT WOS:A1991GY25100041 PM 1755701 ER PT J AU DELOACHBANTA, LJ BARBER, FA AF DELOACHBANTA, LJ BARBER, FA TI NONHEALING MASSES OF THE RIGHT CHEEK AND SUBMANDIBULAR AREAS - DIAGNOSIS - CERVICOFACIAL ACTINOMYCOSIS SO ARCHIVES OF DERMATOLOGY LA English DT Note RP DELOACHBANTA, LJ (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 10 TC 3 Z9 3 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 DEC PY 1991 VL 127 IS 12 BP 1831 EP & PG 0 WC Dermatology SC Dermatology GA HB975 UT WOS:A1991HB97500013 PM 1845284 ER PT J AU OLSEN, EA AF OLSEN, EA TI A NEW AMERICAN STRATEGY IN ASIA SO ASIAN SURVEY LA English DT Article RP OLSEN, EA (reprint author), USN,POSTGRAD SCH,DEPT NATL SECUR AFFAIRS,MONTEREY,CA 93940, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU UNIV CALIF PRESS PI BERKELEY PA JOURNALS DEPT 2120 BERKELEY WAY, BERKELEY, CA 94720 SN 0004-4687 J9 ASIAN SURV JI Asian Surv. PD DEC PY 1991 VL 31 IS 12 BP 1139 EP 1154 DI 10.1525/as.1991.31.12.00p0114e PG 16 WC Area Studies SC Area Studies GA HA011 UT WOS:A1991HA01100002 ER PT J AU DEAKINS, DE BAGGETT, JC BOHNKER, BK AF DEAKINS, DE BAGGETT, JC BOHNKER, BK TI BRIEF REACTIVE PSYCHOSIS IN NAVAL AVIATION SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID DIFFERENTIAL-DIAGNOSIS; 3RD PSYCHOSIS; STATES; DEFINE; GUIDE AB Five naval aviation personnel diagnosed with brief reactive psychosis (BRP) have appeared before the Special Board of Flight Surgeons (SBFS) at the Naval Aerospace Medical Institute (NAMI). These cases demonstrate the challenges in diagnosis and disposition that face the clinical aeromedical specialist in evaluating the aviator who develops psychiatric symptoms. We discuss the aeromedical factors that must be considered when contemplating returning aviators with psychiatric diagnoses to flying duties. Sudden behavioral changes in aviation personnel require a systematic assessment, thorough documentation, and continuing reevaluation. The differentiation between organic and functional etiologies may be difficult. Final disposition may require consultation with experienced physicians skilled in both aviation psychiatry and neurology. RP BAGGETT, JC (reprint author), USN,INST AEROSP MED,DEPT AVIAT PSYCHIAT,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 22 TC 1 Z9 1 U1 0 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 DEC PY 1991 VL 62 IS 12 BP 1166 EP 1170 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GR868 UT WOS:A1991GR86800008 PM 1755798 ER PT J AU BASON, R YACAVONE, D AF BASON, R YACAVONE, D TI DECOMPRESSION-SICKNESS UNITED-STATES NAVY ALTITUDE CHAMBER EXPERIENCE 1 OCTOBER 1981 TO 30 SEPTEMBER 1988 SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID HYPOXIA; FLIGHT AB This study reports the incidence of decompression sickness (DCS) occurring in U.S. Navy altitude chambers in association with physiological training of aircrews for the 7-year period from 1 October 1981 to 30 September 1988. There were 140 total cases of DCS in 136,696 chamber exposures, an incidence of 0.10%. Among trainees, there were 78 cases in 111,674 exposures, and incidence of 0.07%. Among inside observers, there were 62 cases in 25,022 exposures and incidence of 0.25%. The incidence of DCS among inside observers was reduced almost two-fold over the last Navy report and is the lowest reported since 1973. Reasons for the reduction are discussed. In addition, analysis of the data includes types of DCS, symptoms, frequency of joint involvement, predisposing factors, altitude and time of onset of DCS, and treatment tables employed. RP BASON, R (reprint author), USN,CTR SAFETY,AVIAT PHYSIOL TRAINING SERV,NAVAL AIR STN,NORFOLK,VA 23511, USA. NR 12 TC 20 Z9 23 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD DEC PY 1991 VL 62 IS 12 BP 1180 EP 1184 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GR868 UT WOS:A1991GR86800011 PM 1755801 ER PT J AU HAMILTON, RJ AF HAMILTON, RJ TI AN OPERATIONALLY ORIENTED APPROACH TO MEDICAL-CARE IN SPACE SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID HEALTH AB As plans to bring the United States into the realm of continuously manned space operations are written, questions concerning the medical support of those operations have been raised. A review of the simple, time-tested principles that guide military operational medicine can be applied to medical care in space. Based on this operational approach, I conclude that a successful medical team must understand the mission, identify medical resources, define medical evacuation capabilities, anticipate medical issues and plan solutions, and develop facility requirements. Once all this has been accomplished, appropriate selection and training of medical personnel completes the preparation. C1 USN,CTR AIR DEV,WARMINSTER,PA 18974. NR 17 TC 5 Z9 5 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD DEC PY 1991 VL 62 IS 12 BP 1196 EP 1199 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GR868 UT WOS:A1991GR86800015 PM 1755805 ER PT J AU EISMAN, MP LANDONARNOLD, S SWINDOLL, CM AF EISMAN, MP LANDONARNOLD, S SWINDOLL, CM TI DETERMINATION OF PETROLEUM HYDROCARBON TOXICITY WITH MICROTOX SO BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY LA English DT Article RP EISMAN, MP (reprint author), USN,CIVIL ENGN LAB,DIV ENVIRONM RESTORAT,CODE L71,PORT HUENEME,CA 93043, USA. NR 11 TC 9 Z9 9 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0007-4861 J9 B ENVIRON CONTAM TOX JI Bull. Environ. Contam. Toxicol. PD DEC PY 1991 VL 47 IS 6 BP 811 EP 816 PG 6 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA GR666 UT WOS:A1991GR66600003 PM 1786452 ER PT J AU LOONEY, RE AF LOONEY, RE TI THE ECONOMICS OF MIDDLE-EAST MILITARY EXPENDITURES - IMPLICATIONS FOR ARMS REDUCTION IN THE REGION SO BULLETIN OF PEACE PROPOSALS LA English DT Article RP LOONEY, RE (reprint author), NAVAL POST GRAD SCH,NATL SECUR,MONTEREY,CA, USA. NR 25 TC 1 Z9 1 U1 0 U2 0 PU SAGE PUBLICATIONS LTD PI LONDON PA 6 BONHILL STREET, LONDON, ENGLAND EC2A 4PU SN 0007-5035 J9 B PEACE PROPOSALS PD DEC PY 1991 VL 22 IS 4 BP 407 EP 417 PG 11 WC International Relations SC International Relations GA GU347 UT WOS:A1991GU34700006 ER PT J AU GRAY, WM NEUMANN, C TSUI, TL AF GRAY, WM NEUMANN, C TSUI, TL TI ASSESSMENT OF THE ROLE OF AIRCRAFT RECONNAISSANCE ON TROPICAL CYCLONE ANALYSIS AND FORECASTING SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article ID HURRICANE AB The impact of aircraft reconnaissance on tropical cyclone (TC) observation and forecasting is assessed. The motivation for this assessment is the termination of Department of Defense (DOD) aircraft reconnaissance in the northwest Pacific in 1987 and the suggestion by some DOD officials that it may also be technically feasible to greatly reduce or similarly discontinue DOD aircraft reconnaissance in the Atlantic. In response thereto, the American Meteorological Society (AMS) Committee on Tropical Meteorology and Tropical Cyclones recommended that a specialized ad hoc group be formed to study the technical aspects of this issue. The resulting study presented here focuses on the issue of the extent to which reliable TC warnings can be continued along the United States hurricane-vulnerable coastline without observations from aerial reconnaissance and summarizes relevant information contained in recent studies prompted by the termination of reconnaissance in the western North Pacific. Primary attention is given to the technical and meteorological aspects of this question and economic and societal aspects receive only brief attention. Although it is recognized that weather satellites are absolutely essential for tropical cyclone observation on a global scale, it is found that independent satellite measurements of position, intensity, outer wind distribution, and ambient steering current of tropical cyclones are sometimes degraded from what can be provided by aircraft over a limited but operationally significant area. Such degraded observational data can significantly impact forecasts of these quantities. C1 USN,OCEANOG & ATMOSPHER RES LAB,ATMOSPHER DIRECTORATE,MONTEREY,CA 93943. SCI APPLICAT INT CORP,MIAMI,FL 33156. RP GRAY, WM (reprint author), COLORADO STATE UNIV,DEPT ATMOSPHER SCI,FT COLLINS,CO 80523, USA. NR 35 TC 12 Z9 13 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 DEC PY 1991 VL 72 IS 12 BP 1867 EP 1883 DI 10.1175/1520-0477(1991)072<1867:AOTROA>2.0.CO;2 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GX180 UT WOS:A1991GX18000003 ER PT J AU QUINN, KA TRESTON, AM SCOTT, FM KASPRZYK, PG AVIS, I SIEGFRIED, JM MULSHINE, JL CUTTITTA, F AF QUINN, KA TRESTON, AM SCOTT, FM KASPRZYK, PG AVIS, I SIEGFRIED, JM MULSHINE, JL CUTTITTA, F TI ALPHA-AMIDATION OF PEPTIDE-HORMONES IN LUNG-CANCER SO CANCER CELLS-A MONTHLY REVIEW LA English DT Review ID GASTRIN-RELEASING PEPTIDE; GROWTH FACTOR-I; GENE-RELATED PEPTIDE; BOMBESIN-LIKE PEPTIDES; SMALL-CELL; PRO-OPIOMELANOCORTIN; PRECURSOR PEPTIDES; SEQUENCE-ANALYSIS; MESSENGER-RNA; EXPRESSION AB Small-cell lung cancer (SCLC), the most common neuroendocrine tumor in humans, provides an excellent model system for analyzing the role of growth factors in lung cancer. SCLCs secrete a wide range of peptide hormones, including some that stimulate tumor cell growth, such as gastrin-releasing peptide and insulin-like growth factor I. Many of these peptides are synthesized as prohormones that acquire biological activity only after specific post-translational modifications. Here, we review our current understanding of the biological role of neuroendocrine peptides in lung carcinogenesis and consider how a mechanistic knowledge of one particular modification, carboxy-terminal alpha-amidation, may permit identification of novel growth factors for lung cancer cells. We also describe potential applications of this knowledge as a basis for prevention-oriented approaches to the disease. C1 USN,NATL MED CTR,DIV CANC PREVENT & CONTROL,BIOMARKERS & PREVENT RES BRANCH,BETHESDA,MD 20889. NR 58 TC 9 Z9 9 U1 1 U2 3 PU COLD SPRING HARBOR LAB PRESS PI PLAINVIEW PA 1 BUNGTOWN RD, PLAINVIEW, NY 11724 SN 1042-2196 J9 CANCER CELL-MON REV PD DEC PY 1991 VL 3 IS 12 BP 504 EP 510 PG 7 WC Oncology; Medicine, Research & Experimental SC Oncology; Research & Experimental Medicine GA HC628 UT WOS:A1991HC62800006 PM 1668141 ER PT J AU BUOT, FA JENSEN, KL AF BUOT, FA JENSEN, KL TI INTRINSIC HIGH-FREQUENCY OSCILLATIONS AND EQUIVALENT-CIRCUIT MODEL IN THE NEGATIVE DIFFERENTIAL RESISTANCE REGION OF RESONANT TUNNELING DEVICES SO COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON THE NUMERICAL ANALYSIS OF SEMICONDUCTOR DEVICES AND INTEGRATED CIRCUITS ( NASECODE 7 ) CY APR, 1991 CL COPPER MOUNTAIN, CO ID CURRENT-VOLTAGE CHARACTERISTICS; PARTICLE TRAJECTORIES; BARRIER STRUCTURES; BISTABILITY; SIMULATION; DIODES; TIMES C1 USN,RES LAB,WASHINGTON,DC 20375. RI Jensen, Kevin/I-1269-2015 OI Jensen, Kevin/0000-0001-8644-1680 NR 20 TC 12 Z9 12 U1 0 U2 1 PU MCB UNIV PRESS LTD PI BRADFORD PA 60/62 TOLLER LANE, BRADFORD, W YORKSHIRE, ENGLAND BD8 9BY SN 0332-1649 J9 COMPEL JI Compel-Int. J. Comp. Math. Electr. Electron. Eng. PD DEC PY 1991 VL 10 IS 4 BP 241 EP 253 DI 10.1108/eb051702 PG 13 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic; Mathematics, Applied SC Computer Science; Engineering; Mathematics GA HA249 UT WOS:A1991HA24900005 ER PT J AU BUOT, FA JENSEN, KL AF BUOT, FA JENSEN, KL TI QUANTUM TRANSPORT - NOVEL APPROACHES IN THE FORMULATION AND APPLICATIONS TO QUANTUM-BASED SOLID-STATE DEVICES SO COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON THE NUMERICAL ANALYSIS OF SEMICONDUCTOR DEVICES AND INTEGRATED CIRCUITS ( NASECODE 7 ) CY APR, 1991 CL COPPER MOUNTAIN, CO ID RESONANT-TUNNELING STRUCTURES; INTRINSIC BISTABILITY; BARRIER STRUCTURES; SIMULATION; EQUATION; DIODES; TIMES AB A novel approach to many-body quantum transport theory which emphasize the role of localized orbitals, and their lattice Fourier transforms, as dynamical basis states is given. The formalism allows for the calculations of particle quantum trajectories, describing individual elementary space and time-dependent events in quantum processes. It is demonstrated that the particle quantum trajectories exhibit behavior quite identical to that of classical particles acted upon by a new "effective quantum force". The present technique for calculating the quantum force can be applied to a procedure for incorporating space and time-dependent quantum tunneling in Selfconsistent Ensembe Particle Monte Carlo (SEPMC) technique for multidimensional device analysis. C1 USN,RES LAB,WASHINGTON,DC 20375. RI Jensen, Kevin/I-1269-2015 OI Jensen, Kevin/0000-0001-8644-1680 NR 31 TC 2 Z9 2 U1 0 U2 0 PU MCB UNIV PRESS LTD PI BRADFORD PA 60/62 TOLLER LANE, BRADFORD, W YORKSHIRE, ENGLAND BD8 9BY SN 0332-1649 J9 COMPEL JI Compel-Int. J. Comp. Math. Electr. Electron. Eng. PD DEC PY 1991 VL 10 IS 4 BP 509 EP 524 DI 10.1108/eb051725 PG 16 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic; Mathematics, Applied SC Computer Science; Engineering; Mathematics GA HA249 UT WOS:A1991HA24900028 ER PT J AU BRYAN, JP AF BRYAN, JP TI NEW MACROLIDES SO CURRENT OPINION IN INFECTIOUS DISEASES LA English DT Article AB Interest has increased recently in newer macrolides and azalides such as clarithromycin and azithromycin. These newer macrolides have much longer plasma half-lives than erythromycin, are concentrated intracellularly, and may be better tolerated than erythromycin. Clinical studies of azithromycin administered once daily and clarithromycin twice daily indicate they are effective therapy of streptococcal pharyngitis, sinusitis, and acute exacerbations of chronic bronchitis and community-acquired pneumonia. They have in vitro activity against Chlamydia pneumoniae, Chlamydia psittaci, and Mycoplasma pneumoniae, but little experience in treatment of pneumonia caused by these organisms with clarithromycin has been reported to date. Azithromycin is effective therapy as a single dose for Chlamydia trachomatis genital infections, but a single dose may not be effective against Neisseria gonorrhoeae. Preliminary information indicates that clarithromycin and azithromycin may be useful against opportunistic infections caused by Mycobacterium avium-intracellulare and other Mycobacteria, as well as Toxoplasma gondii and Cryptosporidium organisms. RP BRYAN, JP (reprint author), UNIFORMED SERV UNIV HLTH SCI,USN,DEPT PREVENT MED,DIV TROP PUBL HLTH,4301 JONES BRIDGE RD,BETHESDA,MD 20814, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0951-7375 J9 CURR OPIN INFECT DIS JI Curr. Opin. Infect. Dis. PD DEC PY 1991 VL 4 IS 6 BP 722 EP 726 DI 10.1097/00001432-199112000-00003 PG 5 WC Infectious Diseases SC Infectious Diseases GA GV644 UT WOS:A1991GV64400003 ER PT J AU BRYAN, JP AF BRYAN, JP TI CEPHALOSPORINS AND CARBAPENEMS SO CURRENT OPINION IN INFECTIOUS DISEASES LA English DT Review AB Several new cephalosporins have recently been marketed or are under development. Cefmetazole is a new second-generation cephalosporin with good activity against many anaerobic bacteria, a half-life almost twice that of cefoxitin, and 10 years of favorable clinical experience in Japan. Third-generation cephalosporins such as cefotaxime and ceftriaxone have been useful in the therapy of gram-negative bacillary meningitis, Lyme neuroborreliosis, gonorrhea, and chancroid. Ceftazidime has been useful in settings with documented or suspected Pseudomonas aeruginosa infections, including meningitis. Newer cephalosporins with in vitro activity against P aeruginosa include cefquinome, cefpirome, cefpiramide, and cefepime. New orally administered cephalosporins such as cefixime, ceftibuten, cefetamet pivoxil, and cefpodoxime proxetil have good activity against gram-negative bacilli (not Serratia marcescens or P aeruginosa), but are less active against Staphylococcus aureus than first-generation oral cephalosporins. Loracarbef is a new carbacephem with in vitro activity similar to cefaclor. Meropenem is a new carbapenem with pharmacokinetics similar to those of imipenem. Since it is stable against dehydropeptidase, coadministration with cilastatin is not required. Compared with imipenem, meropenem has better in vitro activity against gram-negative bacilli but less activity against gram-positive bacteria. RP BRYAN, JP (reprint author), UNIFORMED SERV UNIV HLTH SCI,USN,DEPT PREVENT MED,DIV TROP PUBL HLTH,4301 JONES BRIDGE RD,BETHESDA,MD 20814, USA. NR 0 TC 4 Z9 4 U1 0 U2 3 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0951-7375 J9 CURR OPIN INFECT DIS JI Curr. Opin. Infect. Dis. PD DEC PY 1991 VL 4 IS 6 BP 727 EP 741 DI 10.1097/00001432-199112000-00004 PG 15 WC Infectious Diseases SC Infectious Diseases GA GV644 UT WOS:A1991GV64400004 ER PT J AU WAYNE, RK GEORGE, SB GILBERT, D COLLINS, PW KOVACH, SD GIRMAN, D LEHMAN, N AF WAYNE, RK GEORGE, SB GILBERT, D COLLINS, PW KOVACH, SD GIRMAN, D LEHMAN, N TI A MORPHOLOGICAL AND GENETIC-STUDY OF THE ISLAND FOX, UROCYON-LITTORALIS SO EVOLUTION LA English DT Article DE ELECTROPHORESIS; FOX; GENETIC VARIATION; MORPHOLOGY; UROCYON-LITTORALIS ID DNA SEQUENCE RELATEDNESS; MITOCHONDRIAL-DNA; NATURAL-POPULATIONS; RESTRICTION ENDONUCLEASES; ALLOZYME DIVERGENCE; F-STATISTICS; DEER MICE; DIFFERENTIATION; HETEROZYGOSITY; EVOLUTION AB The Island Fox, Urocyon littoralis, is a dwarf form found on six of the Channel Islands located 30-98 km off the coast of southern California. The island populations differ in two variables that affect genetic variation: effective population size and duration of isolation. We estimate that the effective population size of foxes on the islands varies from approximately 150 to 1,000 individuals. Archeological and geological evidence suggests that foxes likely arrived on the three northern islands minimally 10,400-16,000 years ago and dispersed to the three southern islands 2,200-4,300 years ago. We use morphometrics, allozyme electrophoresis, mitochondrial DNA (mtDNA) restriction-site analysis, and analysis of hypervariable minisatellite DNA to measure variability within and distances among island fox populations. The amount of within-population variation is lowest for the smallest island populations and highest for the mainland population. However, the larger populations are sometimes less variable, with respect to some genetic measures, than expected. No distinct trends of variability with founding time are observed. Genetic distances among the island populations, as estimated by the four techniques, are not well correlated. The apparent lack of correspondence among techniques may reflect the effects of mutation rate and colonization history on the values of each genetic measure. C1 NAT HIST MUSEUM LOS ANGELES,MAMMAL SECT,LOS ANGELES,CA 90007. NCI,FREDERICK CANC RES FACIL,BIOL CARCINOGENESIS & DEV PROGRAM,FREDERICK,MD 21207. SANTA BARBARA MUSEUM NAT HIST,SANTA BARBARA,CA 93105. USN,FACIL ENGN COMMAND,NAT RESOURCES MANAGEMENT BRANCH,SAN BRUNO,CA 94006. RP WAYNE, RK (reprint author), UNIV CALIF LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90024, USA. RI Lehman, Niles/A-3434-2008 NR 82 TC 93 Z9 97 U1 3 U2 17 PU SOC STUDY EVOLUTION PI LAWRENCE PA 810 E 10TH STREET, LAWRENCE, KS 66044 SN 0014-3820 J9 EVOLUTION JI Evolution PD DEC PY 1991 VL 45 IS 8 BP 1849 EP 1868 DI 10.2307/2409836 PG 20 WC Ecology; Evolutionary Biology; Genetics & Heredity SC Environmental Sciences & Ecology; Evolutionary Biology; Genetics & Heredity GA GY460 UT WOS:A1991GY46000009 ER PT J AU BERG, E HOOD, JA FRYER, GJ AF BERG, E HOOD, JA FRYER, GJ TI REDUCTION OF THE GENERAL FRACTURE COMPLIANCE MATRIX-Z TO ONLY 5 INDEPENDENT ELEMENTS SO GEOPHYSICAL JOURNAL INTERNATIONAL LA English DT Note CT 4TH INTERNATIONAL WORKSHOP ON SEISMIC ANISOTROPY ( 4 IWSA ) CY JUL 02-06, 1990 CL HERIOT WATTT UNIV, EDINBURGH, SCOTLAND SP AMOCO PROD RES, ARCO OIL & GAS, BRIT GEOL SURVEY, COMPAGNIE GEN GEOPHYS, CONOCO, EDINBURGH ANISOTROPY PROJECT, EXXON PROD RES, PETR SCI & TECHNOL INST, SCHLUMBERGER DOLL RES, W ATLAS GEOPHYS RES HO HERIOT WATTT UNIV DE ANISOTROPY; FRACTURE COMPLIANCE; FRACTURES ID MEDIA; SLIP AB In a system of plane parallel fractures, it is often assumed that resistance to slip on the fractures is independent of the direction of that slip. The fracture system then is transversely isotropic in its elastic properties and can be characterized by just two numbers: the compliances normal and tangential to the fractures, for example. But any relief on the fracture surfaces will destroy the symmetry and demand additional elastic constants. In general, a system of plane parallel fractures has a 3 x 3 matrix Z of fracture compliances which contributes to the overall 6 x 6 compliance matrix S of the fractured solid. For transversely isotropic fractures Z has only two independent elements, but for general fractures all that is known is that Z must be symmetric. This implies that six parameters are needed to describe a fracture system with triclinic behaviour. We find, however, that there is always a coordinate rotation which sets a symmetric pair of the off-diagonal terms of Z to zero, so Z has, in fact, only five independent elements. The zeros of the rotated Z show that particle displacements tangential to the fractures and parallel to the new coordinate axes are decoupled from each other. Despite this decoupling, the medium is still fully triclinic because displacement normal to the fractures still couples with all the other displacements. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BERG, E (reprint author), UNIV HAWAII MANOA,SCH OCEAN & EARTH SCI & TECHNOL,HONOLULU,HI 96822, USA. NR 9 TC 7 Z9 7 U1 0 U2 0 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 DEC PY 1991 VL 107 IS 3 BP 703 EP 707 DI 10.1111/j.1365-246X.1991.tb01429.x PG 5 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GT928 UT WOS:A1991GT92800030 ER PT J AU RONA, PA PALMER, DR JONES, C CHAYES, DA CZARNECKI, M CAREY, EW GUERRERO, JC AF RONA, PA PALMER, DR JONES, C CHAYES, DA CZARNECKI, M CAREY, EW GUERRERO, JC TI ACOUSTIC IMAGING OF HYDROTHERMAL PLUMES, EAST PACIFIC RISE, 21-DEGREES-N, 109-DEGREES-W SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID CURRENT PROFILER OBSERVATIONS; MID-ATLANTIC RIDGE; DE-FUCA RIDGE; MASSIVE SULFIDE; HOT SPRINGS; OCEAN; VENTS; FLOW; DEPOSITS; CREST AB We report the first observations based on acoustic imaging of large-scale structure and time variability of buoyant plumes emanating from black smoker-type seafloor hot springs. Three-dimensional plume reconstructions were made from a digital data set of acoustic backscattering information recorded on a prototype submersible-mounted sonar system. The acoustic images of two adjacent black smokers depict volume and show zones of flow organization (meters to tens of meters) in the lower 40 m of the buoyant plumes. The two plumes coalesce, bend in the prevailing current, exhibit short-term (minutes) variation in cross section, and rapid (seconds) turbulent eddy variations at small scales (< 1 m). The plume imaging system is being developed for determination of plume dynamics, flux determinations when combined with chemical and thermal measurements, and long-term monitoring of the activity of seafloor hydrothermal fields. C1 USN,RES LAB,WASHINGTON,DC 20375. NATL AUTONOMOUS UNIV MEXICO,INST GEOL,MEXICO CITY 04510,DF,MEXICO. RP RONA, PA (reprint author), NOAA,ATLANTIC OCEANOG & METEOROL LAB,4301 RICKENBACKER CAUSEWAY,MIAMI,FL 33149, USA. RI Wright, Dawn/A-4518-2011 OI Wright, Dawn/0000-0002-2997-7611 NR 25 TC 21 Z9 21 U1 0 U2 5 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 DEC PY 1991 VL 18 IS 12 BP 2233 EP 2236 DI 10.1029/91GL02897 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GY093 UT WOS:A1991GY09300015 ER PT J AU SUMMERS, ME STROBEL, DF AF SUMMERS, ME STROBEL, DF TI TRITON ATMOSPHERE - A SOURCE OF N AND H FOR NEPTUNE MAGNETOSPHERE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID IONOSPHERE; PHOTOCHEMISTRY AB Mass loading of the Neptunian magnetosphere occurs primarily by thermal escape of H, H-2, and N from Triton's upper atmosphere. The global escape rate of hydrogen is approximately 7 x 10(25)s-1, determined by the global average methane photolysis rate, whereas the escape rate of nitrogen for our preferred model is approximately 3.4 x 10(25)s-1, and is controlled by the global and orbital average energy deposition rate due to precipitating magnetospheric electrons. The escape rate of H+ and N+ is < 4% of the neutral escape rate and implies that mass loading of the Neptunian magnetosphere is not localized to Triton's corona. The ratio of hydrogen to nitrogen escape rates for our preferred model is approximately 2:1, comparable to the [H+]/[N+] abundance ratio inferred for Neptune's magnetosphere. C1 JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. JOHNS HOPKINS UNIV,DEPT EARTH & PLANETARY SCI,BALTIMORE,MD 21218. RP SUMMERS, ME (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 8 TC 19 Z9 19 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD DEC PY 1991 VL 18 IS 12 BP 2309 EP 2312 DI 10.1029/91GL01334 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GY093 UT WOS:A1991GY09300034 ER PT J AU CASHELL, AW COHEN, ML AF CASHELL, AW COHEN, ML TI MASCULINIZING SCLEROSING STROMAL TUMOR OF THE OVARY DURING PREGNANCY SO GYNECOLOGIC ONCOLOGY LA English DT Article C1 USN HOSP,DEPT LAB MED,JACKSONVILLE,FL 32214. RP CASHELL, AW (reprint author), WAKE FOREST UNIV,BOWMAN GRAY SCH MED,DEPT PATHOL,300 S HAWTHORNE RD,WINSTON SALEM,NC 27103, USA. NR 16 TC 19 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 0090-8258 J9 GYNECOL ONCOL JI Gynecol. Oncol. PD DEC PY 1991 VL 43 IS 3 BP 281 EP 285 DI 10.1016/0090-8258(91)90036-5 PG 5 WC Oncology; Obstetrics & Gynecology SC Oncology; Obstetrics & Gynecology GA GW432 UT WOS:A1991GW43200019 PM 1752500 ER PT J AU ROBERSON, CW HAFIZI, B AF ROBERSON, CW HAFIZI, B TI WAVELENGTH AND EMITTANCE REQUIREMENTS IN FREE-ELECTRON LASERS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID BEAM QUALITY; GAIN AB Improvements in electron beam quality are required for operation of free-electron lasers at short wavelengths and low voltages. We have investigated this scaling for an amplifier in the small-signal gain-focused regime of operation subject to the requirements of 1) good geometrical overlap between the radiation beam and the matched electron beam and 2) cold-electron-beam interaction. The scaling is given by simple analytical formulas. C1 USN,RES LAB,BEAM PHYS BRANCH,WASHINGTON,DC 20375. RP ROBERSON, CW (reprint author), OFF NAVAL RES,DIV PHYS,ARLINGTON,VA 22217, USA. NR 20 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2508 EP 2511 DI 10.1109/3.104126 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700002 ER PT J AU TING, A HAFIZI, B SPRANGLE, P TANG, CM AF TING, A HAFIZI, B SPRANGLE, P TANG, CM TI EVOLUTION OF A FINITE PULSE OF RADIATION IN A HIGH-POWER FREE-ELECTRON LASER SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID NON-LINEAR THEORY; EFFICIENCY ENHANCEMENT; HIGH-GAIN; AMPLIFIERS; WAVE; INSTABILITY; OSCILLATOR; WIGGLERS; REGIME; PHASE AB The development of an optical pulse of finite axial extent is studied by means of an axisymmetric time-dependent particle simulation code for different rates of tapering of the wiggler field. The results illustrate a number of the physical phenomena underlying the free-electron laser mechanism. These include: suppression of the sideband instability; the role of gain focusing versus that of refractive guiding; efficiency enhancement; and pulse slippage. It is found that a significant reduction in the sideband modulation of the optical field can be achieved with a faster tapering of the wiggler parameters. Increasing the tapering rate also reduces refractive guiding, causing the optical wavefronts to become more convex, thus spreading the optical field into a larger cross section. The corresponding enhancement of the peak output power is associated with an increased lateral extent of the optical field rather than an increase in the field amplitude. RP TING, A (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 37 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2529 EP 2538 DI 10.1109/3.104129 PG 10 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700005 ER PT J AU ESAREY, E TANG, CM MARABLE, WP AF ESAREY, E TANG, CM MARABLE, WP TI THE EFFECTS OF FIELD ERRORS ON LOW-GAIN FREE-ELECTRON LASERS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID TRAJECTORY STRAIGHTENER ISSUES; PERMANENT-MAGNET UNDULATORS; FEL PERFORMANCE; WIGGLER; REDUCTION AB The effects of random wiggler magnetic field errors on low-gain free-electron lasers are examined analytically and numerically through the use of ensemble averaging techniques. Wiggler field errors perturb the electron beam as it propagates and lead to a random walk of the beam centroid delta-x, variations in the axial beam energy delta-gamma-z and deviations in the relative phase of the electrons in the ponderomotive wave delta-psi. In principle, the random walk may be kept as small as desired through the use of transverse focusing and beam steering. Transverse focusing of the electron beam is shown to be ineffective in reducing the phase deviation. Furthermore, it is shown that beam steering at the wiggler entrance reduces the average phase deviation at the end of the wiggler by 1/3. The effect of the field errors (via the phase deviation) on the gain in the low-gain regime is calculated. To avoid significant reduction in gain it is necessary for the phase deviation to be small compared to 2-pi. The detrimental effects of wiggler errors on low-gain free-electron lasers may be reduced by arranging the magnet poles in an optimal ordering such that the magnitude of the phase deviation is minimized. C1 HAMPTON UNIV,DEPT MATH,HAMPTON,VA 23668. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 23 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2682 EP 2692 DI 10.1109/3.104149 PG 11 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700025 ER PT J AU MARABLE, WP TANG, CM ESAREY, E AF MARABLE, WP TANG, CM ESAREY, E TI SIMULATION OF FREE-ELECTRON LASERS IN THE PRESENCE OF CORRELATED MAGNETIC-FIELD ERRORS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID WIGGLER AB The inevitable errors of acutal magnetic wigglers yield a degraded performance of the free-electron laser (FEL) with respect to the performance obtained from ideally modeled magnetic wigglers. The impact of these errors have been theoretically and computationally investigated for simple error modes, in which the field errors have uniform or sinusoidal spatial extent and amplitudes that are statistically independent for each magnet pole piece. These simple models have been recently extended to include more complicated spatial structures and statistically correlated field errors in the analysis of FEL performance. In the present work numerical simulations of the FEL are presented, for field errors with statistical correlations, that verify the analytic predictions of the recently extended model. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP MARABLE, WP (reprint author), HAMPTON UNIV,DEPT MATH,HAMPTON,VA 23668, USA. NR 11 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 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD DEC PY 1991 VL 27 IS 12 BP 2693 EP 2696 DI 10.1109/3.104150 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GR217 UT WOS:A1991GR21700026 ER PT J AU HSIAO, DK AF HSIAO, DK TI A PARALLEL, SCALABLE, MICROPROCESSOR-BASED DATABASE COMPUTER FOR PERFORMANCE GAINS AND CAPACITY GROWTH SO IEEE MICRO LA English DT Article AB The multiback-end database supercomputer, or MDBS, consists of the architecture and performance of an experimental database computer and a number of database processors and their corresponding database stores. The author relates two studies: one on the design goals and architectural considerations of the microprocessor-based MDBS and the other on the performance expectations and benchmark results in various loads and configurations. RP HSIAO, DK (reprint author), NAVAL POST GRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0272-1732 J9 IEEE MICRO JI IEEE Micro PD DEC PY 1991 VL 11 IS 6 BP 44 EP 60 DI 10.1109/40.108572 PG 17 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA GV107 UT WOS:A1991GV10700007 ER PT J AU TRIZNA, DB AF TRIZNA, DB TI STATISTICS OF LOW GRAZING ANGLE RADAR SEA SCATTER FOR MODERATE AND FULLY-DEVELOPED OCEAN WAVES SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID MODEL; BACKSCATTER; SURFACE AB Results are reported of two deep ocean radar sea scatter experiments using calibrated marine navigation radars. The first experiment featured a continuous wind direction over a four-day period, satisfying time and fetch requirements for a fully developed sea. The second experiment experienced changing winds, which was expected to produce random seas. Radar cross section (RCS) samples from a 60-degrees sector centered about the maximum clutter direction were assembled into cumulative distributions for several range bins, corresponding to different grazing angles between 1-degrees and 8-degrees. These distributions are bimodal for moderate to strong winds and were fitted by two Weibull distributions. The Weibull fit to the highest amplitudes was associated with discrete scatters, while that fitting the lower amplitudes was identified with distributed roughness. For the fully developed seas, the percentage occurrence of the higher amplitude Weibull fitted region, identified with sea spikes, varied with the third power of wind friction velocity, similar to the percentage occurrence of white cap coverage found by others. Results are summarized by plots of the wind speed dependencies of the Weibull parameters of the two distributions. Models for scattering mechanisms inferred from these results are suggested. RP TRIZNA, DB (reprint author), USN,RES LAB,DIV RADAR,WASHINGTON,DC 20375, USA. NR 22 TC 42 Z9 43 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD DEC PY 1991 VL 39 IS 12 BP 1681 EP 1690 DI 10.1109/8.121588 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HC518 UT WOS:A1991HC51800008 ER PT J AU MRSTIK, BJ RENDELL, RW AF MRSTIK, BJ RENDELL, RW TI SI-SIO2 INTERFACE STATE GENERATION DURING X-RAY-IRRADIATION AND DURING POSTIRRADIATION EXPOSURE TO A HYDROGEN AMBIENT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID SILICON DIOXIDE FILMS; TRAPPED HOLES; FIELD-DEPENDENCE; MOS DEVICES; OXIDE; RADIATION; CAPACITORS; CHARGE; POLYSILICON; ELECTRONS AB We have measured the changes in the number of interface traps and oxide traps which result when a previously x-ray irradiated MOSFET is exposed to a hydrogen ambient. At room temperature we observe a doubling in the number of interface states during the hydrogen exposure and a simultaneous decrease in the number of positively charged oxide traps. The increase in the number of interface states is approximately the same as the decrease in the number of oxide traps. These changes can be explained as resulting from the cracking of H-2 by positively charged radiation induced defects in the oxide. This cracking reaction produces H+ ions which are then transported to the interface (under positive gate bias), where they react to form interface states. The necessity of positively charged radiation induced defects in the oxide to explain the post-irradiation buildup of interface states leads us to propose a model for the buildup of interface states during and immediately after irradiation. This model supports recent models of interface state formation as resulting from H+ transport, and clarifies the origin of the H+. We also point out a possible problem with the commonly accepted belief that P(b) centers are passivated by hydrogen. RP MRSTIK, BJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 37 TC 50 Z9 51 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1101 EP 1110 DI 10.1109/23.124081 PN 1 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300008 ER PT J AU SAKS, NS BROWN, DB RENDELL, RW AF SAKS, NS BROWN, DB RENDELL, RW TI EFFECTS OF SWITCHED GATE BIAS ON RADIATION-INDUCED INTERFACE TRAP FORMATION SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID MOS STRUCTURES; DEPENDENCE; GENERATION; TRANSPORT; BUILDUP; DEVICES; STATES; SOLIDS AB Switched gate bias experiments have been used to test the hydrogen model for the time-dependent buildup of interface traps N(it) after a radiation pulse. In the hydrogen model, slow transport of radiation-induced H+ ions through the oxide to the Si/SiO2 interface is the rate-limiting step in the N(it) formation process. A model based on dispersive transport theory has been used to numerically simulate the time-dependent H+ drift through the oxide towards the gate under negative bias, then back towards the Si/SiO2 interface under positive bias. First, good agreement between the simulations and experiment is obtained for the final magnitude of DELTA-N(it), both for positive and negative bias during irradiation. Second, the good agreement for the magnitude of DELTA-N(it) required a refined assumption for the initial (immediately following irradiation) distribution of the H+. It was assumed that the H+ is created by the radiation throughout the oxide but with an enhanced probability for creation near the Si/SiO2 interface. Previously treatments have assumed that the H+ is created either only in the oxide bulk or only at the oxide interfaces. Third, simulations of the time dependence of the interface trap growth during the second (positive bias) transport phase overestimate the speed of H+ transport. This is to be contrasted with simulations of a single H+ transport phase where predictions of the rate of H+ transport have previously been shown to be adequate. We conclude that the procedure used for the numerical simulations provides only a lower bound on the transport time when the direction of the gate bias is switched during the N(it) buildup. This behavior is due to a "memory" effect in the dispersive H+ transport. RP SAKS, NS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 24 TC 21 Z9 22 U1 1 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1130 EP 1139 DI 10.1109/23.124085 PN 1 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300012 ER PT J AU WALTERS, RJ MESSENGER, SR SUMMERS, GP BURKE, EA KEAVNEY, CJ AF WALTERS, RJ MESSENGER, SR SUMMERS, GP BURKE, EA KEAVNEY, CJ TI SPACE RADIATION EFFECTS IN INP SOLAR-CELLS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID INDUCED DISPLACEMENT DAMAGE; ENERGY-DEPENDENCE; SILICON; TEMPERATURE; RESISTANCE AB InP solar cells and mesa diodes grown by metalorganic chemical vapor deposition (MOCVD) have been irradiated with electrons and protons at room temperature. The radiation induced defects (RID's) were characterized by Deep Level Transient Spectroscopy (DLTS), and the degradation of the solar cell performance was determined through I-V measurements. The nonionizing energy loss (NIEL) of electrons and protons in InP was calculated as a function of energy from 1-200 MeV and compared to the measured defect introduction rates. A linear dependence was evident. InP solar cells showed significantly more radiation resistance than c-Si or GaAs/Ge cells under 1 MeV electron irradiation. Using the calculated InP damage rates and measured damage factors, the performance of InP solar cells as a function of orbital altitude and time in orbit was predicted and compared with the performance of c-Si solar cells in the same environment. In all cases, the InP cells showed highly superior radiation resistance. C1 SFA INC,LANDOVER,MD 20785. UNIV MARYLAND,CATONSVILLE,MD 21228. SPIRE CORP,BEDFORD,MA 01730. RP WALTERS, RJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 28 TC 16 Z9 16 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1153 EP 1158 DI 10.1109/23.124088 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300015 ER PT J AU BEUTLER, DE LORENCE, LJ BROWN, DB AF BEUTLER, DE LORENCE, LJ BROWN, DB TI DOSIMETRY IN LINAC ELECTRON-BEAM ENVIRONMENTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB The relationship between dose in TLDs to dose in packaged microelectronic devices as a function electron beam energy is calculated using the CEPXS/ONELD radiation transport code. The effects of adjacent materials, including TLDs, upon the energy deposition in the device are also discussed. Our calculations indicate that dosimetry errors for linac electron beam environments (electron energies > 12 MeV) can be made less than 5% if appropriate materials and geometries are used. The CEPXS/ONELD code provides a very powerful tool for dosimetry analysis in electron-beam environments. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BEUTLER, DE (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1171 EP 1179 DI 10.1109/23.124090 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300017 ER PT J AU ZVANUT, ME STAHLBUSH, RE CARLOS, WE HUGHES, HL LAWRENCE, RK HEVEY, R BROWN, GA AF ZVANUT, ME STAHLBUSH, RE CARLOS, WE HUGHES, HL LAWRENCE, RK HEVEY, R BROWN, GA TI SIMOX WITH EPITAXIAL SILICON - POINT-DEFECTS AND POSITIVE CHARGE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID RECHARGEABLE E' CENTERS; DIOXIDE FILMS; ON-INSULATOR; HOLE; IMPLANTATION; RADIATION; OXIDES; MODEL; SIO2 AB We use Electron Paramagnetic Resonance (EPR), capacitance-voltage (CV) and point contact transistor measurements to investigate the radiation response of the SIMOX substrate emphasizing the difference between those samples with and without an epitaxial Si layer. We will show that the hydrogen present during epitaxial deposition is responsible for a ten-fold increase in radiation induced defects. Furthermore, our measurements indicate that the density of positive charge and oxygen vacancy related defects (E' centers) typically associated with this charge are not correlated in the case of hydrogen treated buried oxides. A model for E' generation in epitaxial SIMOX will be developed based on the known influence of hydrogen and lack of positive charge creation. Results of etch back measurements will be briefly addressed. C1 ARACOR,WASHINGTON,DC. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD. TEXAS INSTRUMENTS INC,DALLAS,TX 75265. RP ZVANUT, ME (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 24 TC 26 Z9 26 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1253 EP 1258 DI 10.1109/23.124101 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300028 ER PT J AU RIOS, R SMELTZER, RK AF RIOS, R SMELTZER, RK TI MODELING OF RADIATION-INDUCED LEAKAGE CURRENTS IN CMOS SOI DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB A new approach to model the effect of radiation-induced interface charges on silicon-on-insulator (SOI) devices has been implemented in a three-dimensional device simulation code. The model is validated by comparison of simulated and measured post-radiation device characteristics. The applicability of the model is illustrated by analysis of standard and fully-depleted silicon-on-sapphire (SOS) devices. The results demonstrate and clarify the role of various bias conditions on parasitics in SOI structures and offer an explanation of the observed absence of back-channel conduction in fully-depleted nMOS-SOS transistors. C1 USN,CTR OCEAN SYST,SAN DIEGO,CA 92151. RP RIOS, R (reprint author), DAVID SARNOFF RES CTR,PRINCETON,NJ 08540, USA. NR 7 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1276 EP 1281 DI 10.1109/23.124105 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300032 ER PT J AU WEAVER, BD JACKSON, EM SUMMERS, GP CHRISEY, DB HORWITZ, JS POND, JM NEWMAN, HS BURKE, EA AF WEAVER, BD JACKSON, EM SUMMERS, GP CHRISEY, DB HORWITZ, JS POND, JM NEWMAN, HS BURKE, EA TI RADIATION EFFECTS IN HIGH-TEMPERATURE SUPERCONDUCTING FILMS AND DEVICES FOR THE NRL HIGH-TEMPERATURE SUPERCONDUCTIVITY SPACE EXPERIMENT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID YBA2CU3O7-DELTA AB The effects of proton irradiation on the performance of films and microwave devices made from the high temperature superconductors YBa2Cu3O7-delta and Tl2Ca2BaCu2O8 have been measured and can be explained in terms of radiation-induced changes in material parameters such as surface impedance, critical current and transition temperature. Changes in material parameters can in turn be linked to atomic displacement effects. C1 SPIRE CORP,BEDFORD,MA 01730. UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. RP WEAVER, BD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1284 EP 1288 DI 10.1109/23.124106 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300033 ER PT J AU BABCOCK, JA TITUS, JL SCHRIMPF, RD GALLOWAY, KF AF BABCOCK, JA TITUS, JL SCHRIMPF, RD GALLOWAY, KF TI EFFECTS OF IONIZING-RADIATION ON THE NOISE PROPERTIES OF DMOS POWER TRANSISTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID OXIDE-SEMICONDUCTOR TRANSISTORS; 1/F NOISE; MOS-TRANSISTORS; MOSFETS; CHARGE AB The 1/f noise properties of DMOS (double-diffused MOS) power transistors were examined as a function of total ionizing dose. The results indicate that radiation causes significant changes in the frequency dependence of the noise of the power MOSFETs studied. Before exposure to radiation, the noise power spectral density indicated a 1/f(lambda) relationship where lambda-ranged from approximately 0.5 to 1.0. As the total dose level increased, lambda-approached unity, while the magnitude of the noise increased proportionally with the radiation-induced charge density. In addition, noise measurements were performed after irradiation, while the devices were annealing under a +/- 12 V bias. It was found that, under the +12 V bias, lambda-increased and under the -12 V bias, lambda-decreased. Finally, no correlation was found between the pre-irradiation 1/f noise magnitude and the radiation hardness of these DMOS power transistors. C1 UNIV ARIZONA,DEPT ELECT & COMP ENGN,TUCSON,AZ 85721. USN,CTR NAVAL WEAP SUPPORT,CRANE,IN 47522. RI Schrimpf, Ronald/L-5549-2013 OI Schrimpf, Ronald/0000-0001-7419-2701 NR 21 TC 16 Z9 16 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1304 EP 1309 DI 10.1109/23.124109 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300036 ER PT J AU TITUS, JL JOHNSON, GH SCHRIMPF, RD GALLOWAY, KF AF TITUS, JL JOHNSON, GH SCHRIMPF, RD GALLOWAY, KF TI SINGLE-EVENT BURNOUT OF POWER BIPOLAR JUNCTION TRANSISTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID MOSFETS AB Experimental evidence of single-event burnout of power bipolar junction transistors (BJTs) is reported for the first time. Several commercial power BJTs were characterized in a simulated cosmic ray environment using mono-energetic ions at the tandem Van de Graaff accelerator facility at Brookhaven National Laboratory. Most of the device types exposed to this simulated environment exhibited burnout behavior. The experimental technique, data, and results are presented, while a qualitative model is used to help explain those results and trends observed in this experiment. C1 UNIV ARIZONA,DEPT ELECT & COMP ENGN,TUCSON,AZ 85721. RP TITUS, JL (reprint author), USN,CTR WEAP SUPPORT,CRANE,IN 47522, USA. RI Schrimpf, Ronald/L-5549-2013 OI Schrimpf, Ronald/0000-0001-7419-2701 NR 13 TC 20 Z9 21 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1315 EP 1322 DI 10.1109/23.124111 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300038 ER PT J AU STAPOR, WJ HINES, JH WILSON, DH AF STAPOR, WJ HINES, JH WILSON, DH TI IONIZING SPACE RADIATION EFFECTS ON SURFACE ACOUSTIC-WAVE RESONATORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB We have investigated ionizing radiation total dose effects on SAW resonators. Sensitivity to radiation is substrate material dependent, with pure substrates showing less radiation degradation in performance. An unexpected reduction in sensitivity was found for devices coated with a 400 angstrom layer of SiOx. RP STAPOR, WJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1329 EP 1335 DI 10.1109/23.124113 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300040 ER PT J AU ENLOW, EW PEASE, RL COMBS, W SCHRIMPF, RD NOWLIN, RN AF ENLOW, EW PEASE, RL COMBS, W SCHRIMPF, RD NOWLIN, RN TI RESPONSE OF ADVANCED BIPOLAR PROCESSES TO IONIZING-RADIATION SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID INTERFACE STATE GENERATION; HARDNESS ASSURANCE; FIELD OXIDES; TRANSISTORS; CIRCUITS; EMITTER AB Ionizing radiation induced gain degradation in microcircuit bipolar polysilicon and crystalline emitter transistors is investigated. In this work, C-60 irradiation testing was performed on bipolar test structures. The effects of collector bias, dose rate, and anneal temperature are discussed. Major differences in the radiation response of polysilicon emitter transistors are demonstrated as a function of dose rate. The worst-case gain degradation occurs at the lowest dose rate complicating hardness assurance testing procedures. The dose rate and anneal data suggest that MIL-STD-883B Test Method 1019.4 is non-conservative for polysilicon emitter transistors, which show enhanced radiation hardness over the crystalline emitter transistors. C1 USN,CTR WEAP SUPPORT,CRANE,IN 47522. UNIV ARIZONA,DEPT ELECT & COMP ENGN,TUCSON,AZ 85721. RP ENLOW, EW (reprint author), MISSION RES CORP,1720 RANDOLPH RD SE,ALBUQUERQUE,NM 87106, USA. RI Schrimpf, Ronald/L-5549-2013 OI Schrimpf, Ronald/0000-0001-7419-2701 NR 22 TC 178 Z9 212 U1 2 U2 8 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1342 EP 1351 DI 10.1109/23.124115 PN 1 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300042 ER PT J AU KING, SE MAGNO, R MAISCH, WG AF KING, SE MAGNO, R MAISCH, WG TI RADIATION-DAMAGE ASSESSMENT OF NB TUNNEL JUNCTION DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID JOSEPHSON AB The radiation hardness of a new technology using Josephson junctions was explored by an irradiation using a fluence of 7.6 x 10(14) protons/cm2 at an energy of 63 MeV from the U.C. Davis cyclotron. In what we believe is the first radiation assessment of Nb/Al2O3/Nb devices, the permanent damage in these devices was investigated. No permanent changes in the I-V characteristics of the junctions were observed indicating no significant level of material defects have occurred at this level of irradiation. RP KING, SE (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 13 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1359 EP 1364 DI 10.1109/23.124117 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300044 ER PT J AU BUCHNER, S KANG, K TU, DW KNUDSON, AR CAMPBELL, AB MCMORROW, D SRINIVAS, V CHEN, YJ AF BUCHNER, S KANG, K TU, DW KNUDSON, AR CAMPBELL, AB MCMORROW, D SRINIVAS, V CHEN, YJ TI CHARGE COLLECTION IN GAAS-MESFETS AND MODFETS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID TRANSIENT RADIATION RESPONSE; FETS; CHANNEL AB A comparison of the amount of charge collected at the drains of GaAs MESFETs irradiated with pulsed laser light and ions and having different gate lengths shows orders of magnitude more charge collected for 0.1-mu-m MESFETs than for 1.2-mu-m MESFETs manufactured using different processes. Analyses of the dependence of the photocurrent pulses on gate and drain voltages, temperature, and light intensity suggest that the enhanced charge collection is primarily due to modulation of the channel width by positive charge trapped in the vicinity of the channel. Enhanced charge collection via channel modulation also occurs in pseudomorphic MODFETs. Pulses with characteristics similar to those produced by laser light, i.e., large amplitudes and long decay times, were obtained when 0.1-mu-m MESFETs were irradiated with He and Si ions. These results reveal the important role played by traps in determining SEU sensitivity in GaAs MESFETs with short gate lengths. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,CATONSVILLE,MD 21228. RP BUCHNER, S (reprint author), MARTIN MARIETTA CORP LABS,BALTIMORE,MD 21227, USA. NR 17 TC 15 Z9 15 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1370 EP 1376 DI 10.1109/23.124119 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300046 ER PT J AU CLEMENT, RE BOISVERT, JC SULLIVAN, PJ AF CLEMENT, RE BOISVERT, JC SULLIVAN, PJ TI CHARACTERIZATION AND MODELING OF NEUTRON-INDUCED TRANSIENT-RESPONSE CHANGES IN SI-AS IBC DETECTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB We have conducted an analysis of the temporal response of an IBC detector in the presence of neutron generated compensating acceptor states under typical operating conditions. A model is presented which describes the observed transient response changes in the regime dominated by dielectric relaxation. C1 MAXWELL LABS INC,S CUBED,SAN DIEGO,CA 92121. NICHOLS RES CORP,SAN DIEGO,CA 92121. RP CLEMENT, RE (reprint author), USN,CTR OCEAN SYST,271 CATALINA BLVD,SAN DIEGO,CA 92152, USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1377 EP 1382 DI 10.1109/23.124120 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300047 ER PT J AU KINNISON, JD MAURER, RH CARKHUFF, BG CONDE, RF BUCHNER, SP KANG, K STAPOR, WJ CAMPBELL, AB HERLICH, GA MOORE, HC AF KINNISON, JD MAURER, RH CARKHUFF, BG CONDE, RF BUCHNER, SP KANG, K STAPOR, WJ CAMPBELL, AB HERLICH, GA MOORE, HC TI RADIATION CHARACTERIZATION OF THE ADSP2100A DIGITAL SIGNAL PROCESSOR SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB A comprehensive radiation effects characterization of the Analog Devices ADSP2100A digital signal processor for the space environment has been completed using Californium fission fragments, laser light, heavy ions and protons. Results of these investigations led to the design of a latchup immune device that has been characterized with respect to SEU and total dose effects, as well as a thoroughly tested latchup protection and fault tolerant circuit. C1 MARTIN MARIETTA CORP LABS,BALTIMORE,MD 21227. USN,RES LAB,WASHINGTON,DC 20375. RP KINNISON, JD (reprint author), JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20707, USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1398 EP 1402 DI 10.1109/23.124123 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300050 ER PT J AU WEATHERFORD, TR TRAN, L STAPOR, WJ PETERSEN, EL LANGWORTHY, JB MCMORROW, D ABDELKADER, WG MCNULTY, PJ AF WEATHERFORD, TR TRAN, L STAPOR, WJ PETERSEN, EL LANGWORTHY, JB MCMORROW, D ABDELKADER, WG MCNULTY, PJ TI PROTON AND HEAVY-ION UPSETS IN GAAS-MESFET DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB Proton and heavy SEU data has been obtained for devices made by several GaAs MESFET manufacturers. Proton energy dependence and proton and heavy ion upset cross sections are reported. Measurements of charge collection from latches designed with various gate widths show that charge collection depths appear deeper than the 1-mu-m depth expected. Critical charge does not scale linearly with area. Proton upset cross sections are reduced with increased device width. C1 USN,RES LAB,WASHINGTON,DC 20375. CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. RP WEATHERFORD, TR (reprint author), SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 20 TC 23 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1450 EP 1456 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300058 ER PT J AU KNUDSON, AR CAMPBELL, AB AF KNUDSON, AR CAMPBELL, AB TI COMPARISON OF EXPERIMENTAL CHARGE COLLECTION WAVE-FORMS WITH PISCES CALCULATIONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID SILICON; SEU AB Calculations of the charge collection transient, performed using PISCES v5. On (Aerospace modified), are compared with previous experimental measurements [1] for energetic He, B, Si, and Fe ions incident on 1, 3, and 10 ohm-cm silicon diodes. Lumped circuit elements are used to represent resistances, capacitance, and inductance attached to the charge collection region. PISCES does not satisfactorily reproduce the changes in the charge collection waveform that occur when bias voltage, ion, or resistivity is changed. RP KNUDSON, AR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 14 Z9 14 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1540 EP 1545 DI 10.1109/23.124143 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300070 ER PT J AU JENKINS, WC MARTIN, RL AF JENKINS, WC MARTIN, RL TI A COMPARISON OF METHODS FOR SIMULATING LOW DOSE-RATE GAMMA-RAY TESTING OF MOS DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID SPACE ENVIRONMENTS; CMOS; ICS AB A radiation testing procedure is presented and experimentally verified in which a series of high dose-rate irradiations, with 100-degrees-C annealing under bias between irradiations, is used to simulate a continuous low dose-rate irradiation. This approach can reduce low dose-rate testing time by as much as a factor of 100 with respect to actual low dose-rate irradiations. The procedure also provides detailed information on the behavior of CMOS parts at low dose-rates which are of interest to many satellite systems. C1 USN ACAD,DEPT EE,MS 14B,ANNAPOLIS,MD 21402. RP JENKINS, WC (reprint author), USN,RES LAB,CODE 6816,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 12 TC 11 Z9 11 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1560 EP 1566 DI 10.1109/23.124146 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300073 ER PT J AU NAMENSON, A AF NAMENSON, A TI ESTIMATING PARAMETER END-POINTS FOR COMBINED ENVIRONMENTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB AB This paper solves the previously unanswered question in Hardness Assurance of estimating electrical parameter and points in a combined environment (e.g. neutrons and total ionizing dose) using data in each environment separately. RP NAMENSON, A (reprint author), USN,RES LAB,WASHINGTON,DC 20037, USA. NR 5 TC 0 Z9 0 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1578 EP 1583 DI 10.1109/23.124148 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300075 ER PT J AU CAMPBELL, AB AF CAMPBELL, AB TI SEU FLIGHT DATA FROM THE CRRES MEP SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 28TH INTERNATIONAL CONF ON NUCLEAR AND SPACE RADIATION EFFECTS CY JUL 15-19, 1991 CL SAN DIEGO, CA SP IEEE, DEFENSE NUCL AGCY, SANDIA NATL LABS, JET PROPULS LAB ID UPSETS; SPACE AB Analysis of single event upset data from the CRRES MEP from 27 July 1990 through 26 March 1991 has shown that upsets are being observed each orbit, the 93422 and 93L422 bipolar RAMs are the most sensitive devices, proton upsets in the radiation belts predominate over cosmic ray upsets, and many devices exhibit multiple bit upsets. RP CAMPBELL, AB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1991 VL 38 IS 6 BP 1647 EP 1654 DI 10.1109/23.124158 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA GZ173 UT WOS:A1991GZ17300085 ER PT J AU MANHEIMER, WM AF MANHEIMER, WM TI PLASMA REFLECTORS FOR ELECTRONIC BEAM STEERING IN RADAR SYSTEMS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB This paper describes investigations into methods of generating a planar plasma for use as a reflector for radar waves. The application is a reflector for radar waves. The use of the plasma reflector could allow electronic beam steering at frequencies above what is generally viable for phased arrays. Three aspects of the planar plasma production are investigated: localization of the plasma, main plasma production, and longterm viability of the system. Possible applications include ship-based antennae at X-band, airborne antennae at 94 GHz, and space-based antennae at 60 GHz. RP MANHEIMER, WM (reprint author), USN,RES LAB,HIGH POWER ELECTROMAGNET RADIAT BRANCH,WASHINGTON,DC 20375, USA. NR 11 TC 51 Z9 55 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1991 VL 19 IS 6 BP 1228 EP 1234 DI 10.1109/27.125044 PG 7 WC Physics, Fluids & Plasmas SC Physics GA HD295 UT WOS:A1991HD29500020 ER PT J AU BIBLARZ, O AF BIBLARZ, O TI APPROXIMATE SHEATH SOLUTIONS FOR A PLANAR PLASMA ANODE SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB Solutions to the anode sheath problem have been studied for the case where the electron and plasma temperature is constant and equal. The planar geometry description of steady, low-temperature collisional plasmas permits certain simplifications to the species continuity equations whereby a single, highly nonlinear equation is obtained for the entire region disturbed by the electrode. This equation is given in terms of the electric field and a variable representing the currents. Our formulation includes charged-particle production with a net current flow. Solutions are generated with a nontrivial analytic expression for the electric field of the form: E(y) = E infinity exp{A/(y + a)2}, where a, A, and E infinity are shape factors. Defects in the approximation can be minimized by identifying the coefficients for the net production of charges a posteriori, thereby yielding largely non-numerical solutions of some validity. Generically, this approach is not restricted to the form of the electric field utilized and other more exact approaches, while expected to refine the numerical values given here, should retain the relationships between parameters basically intact. Meaningful results have been found for nitrogen at moderately high densities [N almost-equal-to 10(24) m-3], which at sufficiently low currents [J almost-equal-to 100 mA/cm2] are realistic for electron-impact ionization and two-body recombination. This case is completely described by two nondimensional groupings (eta and z), which are sufficient to define the sheath and ambipolar regions. The constants A and a are evaluated using information for nitrogen at 6000 K, a case with well documented values, corresponding to degrees of ionization above 10(-6). Other practical discharge gases are also represented in the example. Scaling laws result from our formulation, which allow for relatively quick answers to many single-temperature collisional plasmas at positive probes and anodes. RP BIBLARZ, O (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 32 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1991 VL 19 IS 6 BP 1235 EP 1243 DI 10.1109/27.125045 PG 9 WC Physics, Fluids & Plasmas SC Physics GA HD295 UT WOS:A1991HD29500021 ER PT J AU Papoulias, FA AF Papoulias, Fotis A. TI BIFURCATION ANALYSIS OF LINE OF SIGHT VEHICLE GUIDANCE USING SLIDING MODES SO INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS LA English DT Article AB The problem of dynamic loss of stability during line-of-sight pursuit navigation of a vehicle under automatic control of a heading sliding mode autopilot is considered. The linear and nonlinear controller gains and the lookahead distance of the guidance law are the main bifurcation parameters. Hopf bifurcation theory techniques are used in order to establish stability of the resulting periodic solutions after the initial loss of stability of straightline motion. The analytical results are confirmed by numerical integrations. It is shown that both linear and nonlinear methods are required in order to evaluate the dynamic response of the system. C1 [Papoulias, Fotis A.] Naval Postgrad Sch, Dept Mech Engn, Monterey, CA 93943 USA. RP Papoulias, FA (reprint author), Naval Postgrad Sch, Dept Mech Engn, Monterey, CA 93943 USA. FU Naval Postgraduate School Direct Research Fund FX This work has been supported by the Naval Postgraduate School Direct Research Fund. The author would like to thank the reviewers for careful reading of the manuscript and a number of useful suggestions. NR 21 TC 15 Z9 17 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-1274 EI 1793-6551 J9 INT J BIFURCAT CHAOS JI Int. J. Bifurcation Chaos PD DEC PY 1991 VL 1 IS 4 BP 849 EP 865 DI 10.1142/S0218127491000622 PG 17 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA V44LO UT WOS:000209750700009 ER PT J AU PIRIE, RB AF PIRIE, RB TI MILITARY MISFORTUNES - THE ANATOMY OF FAILURE IN WAR - COHEN,EA, GOOCH,J SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Book Review RP PIRIE, RB (reprint author), USN,WAR COLL,STRATEG STUDIES GRP,NEWPORT,RI, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD WIN PY 1991 VL 7 IS 2 BP 107 EP 109 PG 3 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA ER714 UT WOS:A1991ER71400062 ER PT J AU HOWARD, RM TANNER, JC LYONS, DF AF HOWARD, RM TANNER, JC LYONS, DF TI FLIGHT TEST OF A HALF-SCALE UNMANNED AIR VEHICLE SO JOURNAL OF AIRCRAFT LA English DT Article AB A half-scale unmanned air vehicle was flight tested to provide lift and drag data for correlation with the full-scale vehicle. Additional work was carried out to determine if wing drag could be reduced with an improved surface finish and a trailing-edge modification. Ground tests for power and thrust using a torque stand and a low-speed wind tunnel supported the flight tests for the determination of engine and propeller parameters. A panel method was used to predict the induced drag behavior of the tested air vehicle. Parasite drag was predicted by build-up methods. The predicted parasite drag for the half-scale fell short of flight-tested values by about 25%, but that predicted for the full-scale vehicle correlated well with the flight data. Within the scatter of data, the induced drag correlated satisfactorily. A comparison was made to lift and drag data extracted from full-scale, idle-power glide tests, and correlation was poor. Implications are that residual thrust prevents these glide-test data from accurately representing the full-scale drag polar. RP HOWARD, RM (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD DEC PY 1991 VL 28 IS 12 BP 843 EP 848 DI 10.2514/3.46107 PG 6 WC Engineering, Aerospace SC Engineering GA GZ901 UT WOS:A1991GZ90100008 ER PT J AU MUSHRUSH, GW BEAL, EJ MOSE, DG MCCLELLAND, DB AF MUSHRUSH, GW BEAL, EJ MOSE, DG MCCLELLAND, DB TI THE PYROLYSIS REACTIONS AND JET FUEL POTENTIAL OF A GREEN RIVER SHALE OIL SO JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS LA English DT Article DE GAS CHROMATOGRAPHY; JET FUEL; MIDDLE DISTILLATE FUELS; PYROLYSIS; SHALE OIL ID ORGANIC-COMPOUNDS AB Oil shale deposits constitute a possible large reserve of oil stocks. The immense Green River shale deposits can potentially be used as a source of middle distillate fuels, such as jet fuel. A major requirement for the jet fuel distillation cut is a high (37%) n-alkane content. Quantities of n-alkanes in the Green River shale oil are insufficient to explain the observed amounts of n-alkanes in jet fuels made from this oil. To study the thermal chemistry of the Green River shale oil, it was separated into three fractions; a saturate, an aromatic, and a polar fraction by distillation and silica-gel desorption. The fractions were pyrolyzed for 15-120 min reaction time periods at temperature and pressure conditions similar to the refining process known as delayed coking. Each fraction was assayed by combined capillary column GC/MS for n-alkane and 1-alkene content. All fractions attained similar n-alkane + 1-alkene yields, with the saturate fraction giving the highest yield of aliphatic compounds. C1 GEORGE MASON UNIV,CTR BASIC & APPL SCI,FAIRFAX,VA 22030. RP MUSHRUSH, GW (reprint author), USN,RES LAB,FUELS SECT,CODE 6180,WASHINGTON,DC 20375, USA. NR 16 TC 2 Z9 2 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2370 J9 J ANAL APPL PYROL JI J. Anal. Appl. Pyrolysis PD DEC PY 1991 VL 22 IS 1-2 BP 73 EP 82 DI 10.1016/0165-2370(91)85007-T PG 10 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA GW899 UT WOS:A1991GW89900007 ER PT J AU MITTAL, KC KALANTAR, DH QI, N HAMMER, DA GERBER, KA SETHIAN, JD AF MITTAL, KC KALANTAR, DH QI, N HAMMER, DA GERBER, KA SETHIAN, JD TI NEUTRON-PRODUCTION IN DENSE X-PINCH PLASMAS PRODUCED FROM DEUTERATED POLYETHYLENE FIBERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB A novel intense source of 2.45 MeV neutrons is described. Exploratory experiments with deuterated polyethylene fibers in an x-pinch configuration have been performed using 370-KA, 80-ns current pulses. Up to 4.5 x 10(8) neutrons per pulse have been produced. Compared to a z pinch, an x pinch produced about the same number of neutrons for the same current, but the x-pinch neutron source may be 1 mm or less in diameter. C1 USN, RES LAB, DIV PLASMA PHYS, WASHINGTON, DC 20375 USA. RP MITTAL, KC (reprint author), CORNELL UNIV, PLASMA STUDIES LAB, ITHACA, NY 14853 USA. NR 20 TC 5 Z9 5 U1 1 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1991 VL 70 IS 11 BP 6712 EP 6717 DI 10.1063/1.349845 PG 6 WC Physics, Applied SC Physics GA GU049 UT WOS:A1991GU04900011 ER PT J AU NADELLA, RK RAO, MV SIMONS, DS CHI, PH DIETRICH, HB AF NADELLA, RK RAO, MV SIMONS, DS CHI, PH DIETRICH, HB TI 10-20 MEV ENERGY-RANGE SI IMPLANTATIONS INTO INP-FE SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID GAAS; PROFILES; DIODES AB Si implantations in the energy range 10-20 MeV were performed into InP:Fe with a dose of 4 x 10(14) cm-2. The secondary-ion mass spectrometry profiles for the as-implanted samples were used to calculate the first four statistical moments of the Si implant distribution. Either 875-degrees-C/10 s rapid thermal annealing or 735-degrees-C/10 min furnace annealing was used to activate the Si implants. No redistribution of Si was observed after annealing. Electrochemical capacitance-voltage profiling was performed on the annealed samples to obtain the carrier concentration depth profiles. Activations of 90%-100% and peak carrier concentrations of 3-4 x 10(18) cm-3 were measured for 10-20 MeV Si implants after 875-degrees-C/10 s rapid thermal annealing. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. USN,RES LAB,WASHINGTON,DC 20375. RP NADELLA, RK (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 15 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1991 VL 70 IS 11 BP 7188 EP 7190 DI 10.1063/1.349762 PG 3 WC Physics, Applied SC Physics GA GU049 UT WOS:A1991GU04900088 ER PT J AU TANNENBAUM, SI MATHIEU, JE SALAS, E CANNONBOWERS, JA AF TANNENBAUM, SI MATHIEU, JE SALAS, E CANNONBOWERS, JA TI MEETING TRAINEES EXPECTATIONS - THE INFLUENCE OF TRAINING FULFILLMENT ON THE DEVELOPMENT OF COMMITMENT, SELF-EFFICACY, AND MOTIVATION SO JOURNAL OF APPLIED PSYCHOLOGY LA English DT Article ID ORGANIZATIONAL COMMITMENT; WORK ORGANIZATIONS; SOCIALIZATION; ATTITUDES; ANTECEDENTS; MANAGEMENT; BEHAVIOR; OUTCOMES; ENTRY C1 PENN STATE UNIV,UNIV PK,PA 16802. USN,CTR TRAINING SYST,ORLANDO,FL. RP TANNENBAUM, SI (reprint author), SUNY ALBANY,SCH BUSINESS,DEPT MANAGEMENT,ALBANY,NY 12222, USA. OI Cannon-Bowers, Janis/0000-0003-2154-4456 NR 50 TC 180 Z9 187 U1 8 U2 45 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0021-9010 J9 J APPL PSYCHOL JI J. Appl. Psychol. PD DEC PY 1991 VL 76 IS 6 BP 759 EP 769 DI 10.1037/0021-9010.76.6.759 PG 11 WC Psychology, Applied; Management SC Psychology; Business & Economics GA GT803 UT WOS:A1991GT80300001 ER PT J AU GAUNTT, DL CLARK, KG HIRST, DJ HEGEDUS, CR AF GAUNTT, DL CLARK, KG HIRST, DJ HEGEDUS, CR TI A SOIL RESISTANT TREATMENT FOR LOW GLOSS COATINGS SO JOURNAL OF COATINGS TECHNOLOGY LA English DT Article AB A treatment has been developed for low gloss paint surfaces, which retards soil adhesion and improves paint cleanability. The treatment consists of an aqueous solution containing colloidal silica. It is believed that the physical presence of the silica on the paint surface and its permanent charge prevent strong adhesion between particulate soils and the paint. Laboratory tests have illustrated the durability of the treatment after exposure to salt spray, fuel, hydraulic fluid, coolant, and nonabrasive cleaners. Accelerated weathering tests have produced slight degradation of the treatment and some cations can produce minor color changes. However, the actual effect of the weathering and water quality on a treated surface are insignificant compared to the extensive color changes of untreated paint surfaces which have been soiled. Preliminary field tests on fleet aircraft have yielded promising results. RP GAUNTT, DL (reprint author), USN,CTR AIR DEV,DEPT AIR VEHICLE & CREW SYST TECHNOL,WARMINSTER,PA 18974, USA. NR 8 TC 4 Z9 4 U1 0 U2 2 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 DEC PY 1991 VL 63 IS 803 BP 25 EP 32 PG 8 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA GW887 UT WOS:A1991GW88700002 ER PT J AU GRIFFIN, OM HALL, MS AF GRIFFIN, OM HALL, MS TI VORTEX SHEDDING LOCK-ON AND FLOW-CONTROL IN BLUFF BODY WAKES - REVIEW SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Review ID CIRCULAR-CYLINDER; OSCILLATING CYLINDER; UNIFORM-FLOW; INSTABILITIES; VIBRATIONS; SOUND AB The results of recent experiments demonstrate that the phenomenon of vortex shedding resonance or lock-on is observed also when a bluff body is placed in an incident mean flow with a periodic component superimposed upon it. This form of vortex shedding and lock-on exhibits a particularly strong resonance between the flow perturbations and the vortices, and provides one of several promising means for modification and control of the basic formation and stability mechanisms in the near-wake of a bluff body. Examples are given of recent direct numerical simulations of the vortex lock-on in the periodic flow. These agree well with the results of experiments. A discussion also is given of vortex lock-on due to body oscillations both normal to and in-line with the incident mean flow, rotational oscillations of the body, and of the effect of sound on lock-on. The lock-on phenomenon is discussed in the overall context of active and passive wake control, on the basis of these and other recent and related results, with particular emphasis placed on active control of the circular cylinder wake. C1 USN,RES LAB,WASHINGTON,DC 20375. SCI APPLICAT INT CORP,MCLEAN,VA 22102. NR 62 TC 48 Z9 51 U1 0 U2 14 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 DEC PY 1991 VL 113 IS 4 BP 526 EP 537 DI 10.1115/1.2926511 PG 12 WC Engineering, Mechanical SC Engineering GA HP712 UT WOS:A1991HP71200002 ER PT J AU OLSEN, RC AF OLSEN, RC TI THEORY AND OBSERVATION OF TRIPLE-ROOT JUMP IN SPACECRAFT CHARGING - COMMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article RP OLSEN, RC (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. RI Olsen, Richard/O-2699-2015 OI Olsen, Richard/0000-0002-8344-9297 NR 2 TC 0 Z9 0 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1991 VL 96 IS A12 BP 21411 EP 21412 DI 10.1029/91JA02429 PG 2 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU768 UT WOS:A1991GU76800041 ER PT J AU LINDSBERG, ML BRUNSWICK, M YAMADA, H LEES, A INMAN, J JUNE, CH MOND, JJ AF LINDSBERG, ML BRUNSWICK, M YAMADA, H LEES, A INMAN, J JUNE, CH MOND, JJ TI BIOCHEMICAL-ANALYSIS OF THE IMMUNE B-CELL DEFECT IN XID MICE SO JOURNAL OF IMMUNOLOGY LA English DT Article ID PHORBOL-MYRISTATE ACETATE; PROTEIN TYROSINE PHOSPHORYLATION; CBA-N MICE; LYMPHOCYTES-B; SURFACE-IMMUNOGLOBULIN; ANTI-IMMUNOGLOBULIN; MOUSE LYMPHOCYTES; ACTIVATION; PROLIFERATION; CALCIUM AB Previous studies have shown that B cells from xid immune defective CBA/N mice that are unresponsive do not proliferate after stimulation with unconjugated anti-Ig. The experiments in this manuscript demonstrate that dextran-anti-Ig conjugates, which induce extensive and prolonged sIg cross-linking, are able to stimulate proliferation of xid B cells. The ability of these conjugates to stimulate proliferation of xid B cells is not related to their ability to stimulate higher levels Of PIP2 breakdown. Thus, high concentrations of unconjugated anti-Ig antibody, which are nonmitogenic for xid B cells, stimulate higher levels Of PIP2 breakdown and of calcium transients than lower concentrations of dextran-conjugated anti-Ig, which are mitogenic. Although unconjugated anti-Ig does not provide a fully competent signal to stimulate proliferation of xid B cells, it induces a sufficiently stimulatory signal to enable them to enter DNA synthesis in the presence of the protein kinase C activator, indolactam. This suggests that the extent or duration of activation of protein kinase C by anti-Ig may be limiting in xid B cells. To examine whether another recently described pathway of B cell activation is defective in these mice, we studied the induction of early anti-Ig-mediated tyrosine kinase activity in xid B cells. Both unconjugated and dextran-conjugated anti-Ig antibody stimulated comparable but not identical patterns of tyrosine phosphorylation. These data taken together with other findings that the combination of phorbol ester and calcium ionophore stimulates high levels of proliferation in xid B cells suggests that the immune defect of xid B cells may be distal to surface Ig-mediated activation of tyrosine kinase and Of PIP2 breakdown but proximal to PKC activation. Alternatively, the xid immune defect may not result from abnormalities in the early signal transduction pathways, but rather from more distal and/or as yet undefined pathways leading to B cell activation. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT MED,ROOM A3060,4301 JONES BRIDGE RD,BETHESDA,MD 20814. NIH,IMMUNOL LAB,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20814. FU NIAID NIH HHS [R01-AI24273, R01-AI27465] NR 36 TC 33 Z9 33 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 DEC 1 PY 1991 VL 147 IS 11 BP 3774 EP 3779 PG 6 WC Immunology SC Immunology GA GQ837 UT WOS:A1991GQ83700015 PM 1719087 ER PT J AU WALLACE, MR MASCOLA, JR OLDFIELD, EC AF WALLACE, MR MASCOLA, JR OLDFIELD, EC TI RED MAN SYNDROME - INCIDENCE, ETIOLOGY, AND PROPHYLAXIS SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID INDUCED HISTAMINE-RELEASE; BACTERICIDAL ACTIVITY; ADVERSE REACTIONS; CARDIAC-ARREST; SLOW INFUSION; VANCOMYCIN; TEICOPLANIN; PHARMACOKINETICS; INFECTIONS; HYPOTENSION AB The red man syndrome (RMS) is the most common toxicity of vancomycin therapy. A prospective trial to investigate the frequency, causation, and possible prophylaxis of this syndrome was conducted. Thirty-three patients were observed during their first two doses (1 g/60 min) of vancomycin. Before dose 1, they were randomized to double-blinded pretreatment with either diphenhydramine (50 mg) or placebo. Patients were examined frequently, and histamine levels were obtained at 0, 30, and 60 min during dose 1. Those with first-dose reactions were rerandomized for pretreatment and had histamine levels drawn during a second infusion. Of 17 patients with placebo pretreatment, 8 (47%) had RMS. None of the 16 pretreated with diphenhydramine had a first-dose reaction (P = .003). Three of the eight first-dose reactors had a second-dose RMS reaction; in one of these three, it was more severe than the dose 1 RMS despite diphenhydramine pretreatment. RMS events were associated with elevated plasma histamine; this was especially true of severe reactions. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. RP WALLACE, MR (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 34 TC 76 Z9 81 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 DEC PY 1991 VL 164 IS 6 BP 1180 EP 1185 PG 6 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA GR660 UT WOS:A1991GR66000020 PM 1955716 ER PT J AU LEE, JN HUSAIN, A CROW, J AF LEE, JN HUSAIN, A CROW, J TI SPECIAL ISSUE OF THE JOURNAL-OF-LIGHTWAVE-TECHNOLOGY ON OPTICAL INTERCONNECTIONS FOR INFORMATION-PROCESSING - FOREWORD SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Editorial Material RP LEE, JN (reprint author), USN,RES LAB,OPT INFORMAT PROC SECT,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 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 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD DEC PY 1991 VL 9 IS 12 BP 1633 EP 1634 PG 2 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA GU025 UT WOS:A1991GU02500001 ER PT J AU MCKINNEY, KR BENDER, BA RICE, RW WU, CC AF MCKINNEY, KR BENDER, BA RICE, RW WU, CC TI SLOW CRACK-GROWTH IN SI3N4 AT ROOM-TEMPERATURE SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB Tests of Si3N4 hot pressed with various types and levels of oxide additives show evidence of room temperature slow crack growth in delayed failure tests (using natural flaws), but not in fracture mechanics (e.g. DCB or DT) tests consistent with more limited literature data for these two types of tests. Neither type of test showed slow crack growth in either CVD Si3N4 or RSSN. Further the fracture mode in the latter two materials was essentially all transgranular, while it was predominantly (e.g. 80%) intergranular in the hot-pressed materials. It was thus postulated that (1 ) the oxide grain boundary phase is responsible for slow crack growth and; (2) varying distribution of the oxide boundary phase and grain boundary character result in sufficient boundaries not susceptible to slow crack growth to pin cracks with macroscopic crack lengths (i.e. as in DCB and DT tests). Both the much smaller crack front lengths and the large number of small (natural, e.g. machining) flaws allows some of these small flaws to grow to critical size, thus leading to delayed failure in the hot-pressed materials. RP MCKINNEY, KR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 7 Z9 7 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD DEC 1 PY 1991 VL 26 IS 23 BP 6467 EP 6472 DI 10.1007/BF02387831 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA GU350 UT WOS:A1991GU35000031 ER PT J AU LAL, RB BRODINE, SK COLIGAN, JE ROBERTS, CR AF LAL, RB BRODINE, SK COLIGAN, JE ROBERTS, CR TI DIFFERENTIAL ANTIBODY RESPONSIVENESS TO P19 GAG RESULTS IN SEROLOGICAL DISCRIMINATION BETWEEN HUMAN T-LYMPHOTROPIC VIRUS TYPE-I AND TYPE-II SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE HTLV-I/II; GAG ANTIBODY; LINEAR EPITOPES ID CELL LEUKEMIA-VIRUS; COMPLETE NUCLEOTIDE-SEQUENCE; HTLV-II; INFECTION; ANTIGENS; LYMPHOMA; GENE AB A new algorithm based upon the differential antibody responses to two gag gene products (p19 and p24) of human T lymphotropic virus (HTLV) has been suggested for serologic discrimination of HTLV type I (HTLV-I) and type II (HTLV-II) [Lillihoj et al., 1990]. To evaluate the practical usefulness of this algorithm, serum specimens from HTLV-seropositive individuals whose infection was confirmed by PCR analysis to be HTLV-I (n = 60) or HTLV-II (n = 61) were analyzed by western blot. The intensities of the antibody response to p24gag and p19gag were scored by one individual without prior knowledge of PCR results. According to the algorithm, specimens with p19 greater-than-or-equal-to p24 were classified as HTLV-I, whereas specimens with p19 < p24 were classified as HTLV-II. Of 60 PCR confirmed HTLV-I specimens, 56 had p19 greater-than-or-equal-to p24 (93%) while 4 had p19 < p24. Of 61 PCR confirmed HTLV-II specimens, 56 had p19 < p24 (92%) and 5 had p19 greater-than-or-equal-to p24. The overall accuracy of serologic differentiation when using this algorithm was 92%, as 4 of 60 HTLV-I (7%) and 5 of 61 HTLV-II (8%) could have been wrongly classified. Although the differential antibody response to p19gag and p24gag provides a simple means of serologically distinguishing between HTLV-I and HTLV-II infection in population-based epidemiological studies, in a clinical context more accurate means of confirmation are required. The dominant p19gag responses were mapped to the C-terminus of p19 (p19(102-117)). Competitive inhibition of p19gag response by peptide p19(102-107), however, did not abrogate the binding of serum specimens from HTLV-I-infected individuals. C1 USN HOSP,DIV INFECT DIS,SAN DIEGO,CA 92134. NIAID,BIOL RESOURCES BRANCH,BETHESDA,MD 20892. WALTER REED ARMY MED CTR,DEPT DIAGNOST RETROVIROL,WASHINGTON,DC 20307. RP LAL, RB (reprint author), CTR DIS CONTROL,DIV VIRAL & RICKETTSIAL DIS,RETROVIRUS DIS BRANCH,ATLANTA,GA 30333, USA. NR 21 TC 22 Z9 22 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 DEC PY 1991 VL 35 IS 4 BP 232 EP 236 DI 10.1002/jmv.1890350404 PG 5 WC Virology SC Virology GA GR591 UT WOS:A1991GR59100003 PM 1687064 ER PT J AU RULLER, JA FRIEBELE, EJ AF RULLER, JA FRIEBELE, EJ TI THE EFFECT OF GAMMA-IRRADIATION ON THE DENSITY OF VARIOUS TYPES OF SILICA SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID VITREOUS SILICA; FUSED SILICA; RADIATION; HYDROGEN; GLASSES; SIO2; MECHANISM AB The radiation-induced changes in density of 11 different silicas, both natural and synthetic, exposed to gamma-irradiation from 10(4)-10(9) rad were measured using a linear density gradient column. It was determined that, in general, the 'dry' silicas that contain less than 150 ppm OH compact monotonically with dose; however, the silicas containing more than 150 ppm OH tend to expand initially and then compact at higher doses. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. NR 33 TC 46 Z9 47 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 DEC PY 1991 VL 136 IS 1-2 BP 163 EP 172 DI 10.1016/0022-3093(91)90131-O PG 10 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GX004 UT WOS:A1991GX00400019 ER PT J AU MERZBACHER, CI MCGRATH, KJ HIGBY, PL AF MERZBACHER, CI MCGRATH, KJ HIGBY, PL TI SI-29 NMR AND INFRARED REFLECTANCE SPECTROSCOPY OF LOW-SILICA CALCIUM ALUMINOSILICATE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; HIGH-RESOLUTION SI-29; CHEMICAL-SHIFTS; ANIONIC STRUCTURE; MINERAL GLASSES; LAYER SILICATES; MELTS; AL-27; ALUMINATE; ALKALI AB Selected calcium aluminosilicate glass compositions have been investigated using nuclear magnetic resonance (NMR) and infrared reflectance spectroscopy, with emphasis on compositions in the silica-poor portion of the system. In particular, a structural explanation for a maximum observed in the glass transition temperature at roughly 15 Mol% SiO2 was sought. Si-29 chemical shifts from magic-angle spinning NMR data are nearly constant in the low-silica glasses and are consistent with depolymerized Q2 species, or fully polymerized Q4 tetrahedra with 4 Al next-nearest neighbors. Static Si-29 NMR spectra bear no evidence of asymmetric Q2 or Q3 sites; however, the asymmetric component could be hidden by extreme broadening due to structural disorder. The functions epsilon" and -Imag(1/epislon) have been calculated from infrared reflectance spectra by a Kramers-Kronig transformation. A change in lineshape which parallels the maximum in T(g) is attributed to variation in the distribution of tetrahedral aluminate species. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP MERZBACHER, CI (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 59 TC 33 Z9 33 U1 0 U2 6 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 DEC PY 1991 VL 136 IS 3 BP 249 EP 259 DI 10.1016/0022-3093(91)90496-S PG 11 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GW562 UT WOS:A1991GW56200008 ER PT J AU LUTCAVAGE, GJ SCHABERG, SJ ARENDT, DA MALMQUIST, JP AF LUTCAVAGE, GJ SCHABERG, SJ ARENDT, DA MALMQUIST, JP TI GINGIVAL MASS WITH MASSIVE SOFT-TISSUE NECROSIS SO JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY LA English DT Article ID WEGENERS GRANULOMATOSIS; STRAWBERRY GUMS; LESIONS C1 OREGON HLTH SCI UNIV,DEPT PATHOL,PORTLAND,OR. WAYNE MEM HOSP,GOLDSBORO,NC. OREGON HLTH SCI UNIV,DEPT ORAL & MAXILLOFACIAL SURG,PORTLAND,OR. USN HOSP,SAN DIEGO,CA 92134. NR 27 TC 5 Z9 5 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0278-2391 J9 J ORAL MAXIL SURG JI J. Oral Maxillofac. Surg. PD DEC PY 1991 VL 49 IS 12 BP 1332 EP 1338 DI 10.1016/0278-2391(91)90314-C PG 7 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA GR606 UT WOS:A1991GR60600015 PM 1955925 ER PT J AU PAPOULIAS, FA AF PAPOULIAS, FA TI ANALYSIS OF STRAIGHT-LINE MOTION OF TOWED SHIPS SO JOURNAL OF SHIP RESEARCH LA English DT Article AB The problem of dynamic loss of stability in steady towing of a surface ship is considered. The two coordinates of the towing point and the towline length are the main bifurcation parameters. Bifurcation theory techniques are used in order to compute equilibrium and periodic solutions. The results are confirmed by numerical integrations. It is shown that both linear and nonlinear analyses are required to thoroughly understand, predict, and evaluate the system dynamic response. RP PAPOULIAS, FA (reprint author), NAVAL POST GRAD SCH,DEPT MECH ENGN,MONTEREY,CA, 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 0022-4502 J9 J SHIP RES JI J. Ship Res. PD DEC PY 1991 VL 35 IS 4 BP 304 EP 313 PG 10 WC Engineering, Marine; Engineering, Civil SC Engineering GA HD011 UT WOS:A1991HD01100004 ER PT J AU LEBLANC, LR SALISBURY, JI AF LEBLANC, LR SALISBURY, JI TI HIGH-RESOLUTION WAVE-NUMBER-FREQUENCY METHODS FOR TOWED ARRAYS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB In passive narrow-band or broadband target detection sonars, line arrays are used to enhance performance. In large towed arrays, wave-number-frequency (k-omega) data analysis methods have been used on an experimental basis to detect and identify the presence of noise generators. The noise sources are composed of acoustically radiating sources located in the ocean, vibrational energy within the array, and pressure disturbances along the array. In this paper, a hybrid autoregressive (AR) technique is presented that will generate k-omega) solutions having better spatial resolution than is currently possible with methods that make use of a two-dimensional fast Fourier transform (FFT). The hybrid AR method is implemented by applying a one-dimensional FFT on the sampled time series data and using this result to obtain an averaged array cross-spectral density matrix. The AR method is now applied to the spatial cross spectral density matrix to obtain a wave-number-frequency spectrum. For the hybrid AR method, equations are presented for calculating the spatial wave-number resolution as a function of signal-to-noise ratio (SNR), array size, and time-bandwidth product (T-BW). The equations for resolution and array gain are useful for determining when to apply the hybrid AR method. In addition to the hybrid AR development, a modification of the FFT-FFT method is introduced that provides efficient and rapid computation of a standard wave-number-frequency spectrum. Comparisons for various SNR, AR order, and T-BW conditions using computer simulated, and actual at-sea data are made between the k-omega solutions obtained using this modified FFT method and our proposed hybrid AR technique. C1 USN,CTR UNDERWATER SYST,NEWPORT,RI 02840. RP LEBLANC, LR (reprint author), FLORIDA ATLANTIC UNIV,BOCA RATON,FL 33431, 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD DEC PY 1991 VL 90 IS 6 BP 3155 EP 3160 DI 10.1121/1.401424 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GT704 UT WOS:A1991GT70400029 ER PT J AU MAZE, G LECROQ, F DECULTOT, D RIPOCHE, J NUMRICH, SK UBERALL, H AF MAZE, G LECROQ, F DECULTOT, D RIPOCHE, J NUMRICH, SK UBERALL, H TI ACOUSTIC SCATTERING FROM FINITE CYLINDRICAL ELASTIC OBJECTS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID IDENTIFICATION METHOD; RESONANCE SCATTERING; SURFACE-WAVES; CYLINDER; SPHEROIDS; SHELLS; WATER; EIGENFREQUENCIES; SPECTROSCOPY; VIBRATION AB The acoustic scattering from infinite elastic cylinders or spheres is well known. It is possible to characterize these targets by their resonance spectra. The resonances are established by the generation of surface waves that propagate around the circumference of the targets. The resonances originate from the phase matching of repeatedly circumnavigating surface waves. Experimentally, it is possible to characterize a target with a complicated shape, but it is not easy to explain the spectra theoretically because the geometry is not separable and the usual analytical methods to calculate the far-field pressure cannot be used. In this paper, resonance spectra and angular diagrams obtained from a target consisting of a finite cylinder with hemispherical endcaps are obtained experimentally. To explain the resonance spectra, an integral phase matching condition is used. Upon incidence normal to the cylinder axis, resonances due to the phase matching of surface waves traveling along a circumference or along a meridian have been observed simultaneously. C1 USN,RES LAB,WASHINGTON,DC 20375. CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. RP MAZE, G (reprint author), UNIV LE HAVRE,ACOUST ULTRASONORE & ELECTR LAB,CNRS,URA 1373,PL ROBERT SCHUMAN,F-76610 LE HAVRE,FRANCE. NR 40 TC 18 Z9 18 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 DEC PY 1991 VL 90 IS 6 BP 3271 EP 3278 DI 10.1121/1.401437 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GT704 UT WOS:A1991GT70400042 ER PT J AU ANNIS, B AF ANNIS, B TI COMPARISON OF THE EFFECTIVENESS OF 2 DEET FORMULATIONS AGAINST AEDES-ALBOPICTUS IN THE PHILIPPINES SO JOURNAL OF THE AMERICAN MOSQUITO CONTROL ASSOCIATION LA English DT Article ID PERSONAL PROTECTION; FIELD; REPELLENTS; MOSQUITOS AB The effectiveness of 2 formulations of deet was tested in the Philippines against Aedes albopictus. A new military issue extended duration repellent formulation (EDRF) was compared with the older standard liquid formulation. Consistently fewer mosquitoes landed on subjects treated with the EDRF than on those treated with the liquid formulation for up to 12 h post-application. However, the difference between the 2 formulations was not statistically significant. Both treatments were significantly different from untreated control subjects. The same was true when other day-biting mosquitoes including Armigeres subalbatus, Ar. flavus and Ae. vexans were analyzed as a group. RP ANNIS, B (reprint author), USN,MED RES UNIT 2,PUBLICAT OFF,APO,SAN FRANCISCO,CA 96528, USA. NR 13 TC 9 Z9 11 U1 0 U2 0 PU AMER MOSQUITO CONTROL ASSN INC PI LAKE CHARLES PA 707-A EAST PRIEN LAKE ROAD, PO BOX 5416, LAKE CHARLES, LA 70606-5416 SN 8756-971X J9 J AM MOSQUITO CONTR JI J. Am. Mosq. Control Assoc. PD DEC PY 1991 VL 7 IS 4 BP 543 EP 546 PG 4 WC Entomology SC Entomology GA GZ479 UT WOS:A1991GZ47900003 PM 1686272 ER PT J AU LEWIS, PAW STEVENS, JG AF LEWIS, PAW STEVENS, JG TI NONLINEAR MODELING OF TIME-SERIES USING MULTIVARIATE ADAPTIVE REGRESSION SPLINES (MARS) SO JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION LA English DT Article DE ASTAR MODELS; LIMIT CYCLES; NONLINEAR TIME SERIES MODELS; RECURSIVE PARTITIONING; THRESHOLD MODELS; WOLF SUNSPOT NUMBERS AB Multivariate Adaptive Regression Splines (MARS) is a new methodology, due to Friedman, for nonlinear regression modeling. MARS can be conceptualized as a generalization of recursive partitioning that uses spline fitting in lieu of other simple fitting functions. Given a set of predictor variables, MARS fits a model in the form of an expansion in product spline basis functions of predictors chosen during a forward and backward recursive partitioning strategy. MARS produces continuous models for high-dimensional data that can have multiple partitions and predictor variable interactions. Predictor variable contributions and interactions in a MARS model may be analyzed using an ANOVA style decomposition. By letting the predictor variables in MARS be lagged values of a time series, one obtains a new method for nonlinear autoregressive threshold modeling of time series. A significant feature of this extension of MARS is its ability to produce models with limit cycles when modeling time series data that exhibit periodic behavior. In a physical context, limit cycles represent a stationary state of sustained oscillations, a satisfying behavior for any model of a time series with periodic behavior. Analysis of the yearly Wolf sunspot numbers with MARS appears to give an improvement over existing nonlinear threshold and bilinear models. A graphical representation for the models is given. C1 USA,WASHINGTON,DC 20310. RP LEWIS, PAW (reprint author), NAVAL POST GRAD SCH,STAT & OPERAT RES,MONTEREY,CA 93943, USA. NR 19 TC 77 Z9 78 U1 0 U2 6 PU AMER STATIST ASSN PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0162-1459 J9 J AM STAT ASSOC JI J. Am. Stat. Assoc. PD DEC PY 1991 VL 86 IS 416 BP 864 EP 877 DI 10.2307/2290499 PG 14 WC Statistics & Probability SC Mathematics GA GU050 UT WOS:A1991GU05000005 ER PT J AU STOFFER, DS WALL, KD AF STOFFER, DS WALL, KD TI BOOTSTRAPPING STATE-SPACE MODELS - GAUSSIAN MAXIMUM-LIKELIHOOD-ESTIMATION AND THE KALMAN FILTER SO JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION LA English DT Article DE ARMA MODELS; EMPIRICAL SAMPLING DISTRIBUTIONS; MONTE-CARLO SIMULATION; STOCHASTIC REGRESSION ID TIME-SERIES; REGRESSION-MODELS; MISSING OBSERVATIONS AB The bootstrap is proposed as a method for assessing the precision of Gaussian maximum likelihood estimates of the parameters of linear state-space models. Our results also apply to autoregressive moving average models, since they are a special case of state-space models. It is shown that for a time-invariant, stable system, the bootstrap applied to the innovations yields asymptotically consistent standard errors. To investigate the performance of the bootstrap for finite sample lengths, simulation results are presented for a two-state model with 50 and 100 observations; two cases are investigated, one with real characteristic roots and one with complex characteristic roots. The bootstrap is then applied to two real data sets, one used in a test for efficient capital markets and one used to develop an autoregressive integrated moving average model for quarterly earnings data. We find the bootstrap to be of definite value over the conventional asymptotics. C1 NAVAL POST GRAD SCH,CTR DEF RESOURCES MANAGEMENT EDUC,MONTEREY,CA 93943. RP STOFFER, DS (reprint author), UNIV PITTSBURGH,DEPT MATH & STAT,PITTSBURGH,PA 15260, USA. NR 30 TC 68 Z9 69 U1 1 U2 7 PU AMER STATIST ASSN PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0162-1459 J9 J AM STAT ASSOC JI J. Am. Stat. Assoc. PD DEC PY 1991 VL 86 IS 416 BP 1024 EP 1033 DI 10.2307/2290521 PG 10 WC Statistics & Probability SC Mathematics GA GU050 UT WOS:A1991GU05000027 ER PT J AU ASHRAFI, S SAENZ, AW UBERALL, H FUSINA, R AF ASHRAFI, S SAENZ, AW UBERALL, H FUSINA, R TI SPLITTING OF CHANNELING-RADIATION PEAKS IN STRAINED-LAYER SUPERLATTICES SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID ELECTRONS; SILICON; PARTICLES; EPITAXY AB The peaks in the spectrum of channeling radiation from 10(6)-10(9)-eV electrons traversing crystalline targets are split into two families if the target is a strained-layer superlattice (SLS). We have studied one example of this effect, including the spectral shifts and, especially, the intensity variations that occur when the crystal is rocked. Because of their strong dependence on beam orientation relative to a channel axis, these phenomena should provide a sensitive measure of the strains in the SLS layers as well as of the population of the bound states. Because of the natural widths of the photon peaks in thin layers, good observability will be ensured for superlattice layers with a thickness of several hundred angstroms or more, although in practice this restriction may quite possibly be considerably relaxed, narrow widths not being essential to the observability of the effect. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP ASHRAFI, S (reprint author), CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064, USA. NR 30 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD DEC PY 1991 VL 8 IS 12 BP 2513 EP 2518 DI 10.1364/JOSAB.8.002513 PG 6 WC Optics SC Optics GA GX214 UT WOS:A1991GX21400017 ER PT J AU MICHELSON, RP VINCENT, WR AF MICHELSON, RP VINCENT, WR TI MAGNETIC-FIELD CHANGES ASSOCIATED WITH CALORIC STIMULATION OF THE HUMAN VESTIBULAR ORGAN SO LARYNGOSCOPE LA English DT Article AB Caloric stimulation of the ear produces a shift of the vestibular resting potential. The current produced by the change in this potential produces a corresponding change in the associated magnetic field. A sensitive magnetic detector (second-derivative gradiometer) was used to detect a large shift in the magnetic field close to the ears of two normal subjects who underwent cold thermic ear stimulation. The shift in the magnetic field tracked the reflex responses in both individuals. This technique could offer a noninvasive direct measure of end-organ function. C1 USN,POSTGRAD SCH,DEPT ENGN,MONTEREY,CA 93940. RP MICHELSON, RP (reprint author), CARE OF HODGES DENISE,UNIV CALIF SAN FRANCISCO,MED CTR,DEPT OTOLARYNGOL HEAD & NECK SURG,SAN FRANCISCO,CA 94143, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0023-852X J9 LARYNGOSCOPE JI Laryngoscope PD DEC PY 1991 VL 101 IS 12 BP 1303 EP 1306 PN 1 PG 4 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA HC472 UT WOS:A1991HC47200008 PM 1766300 ER PT J AU OLEARY, MJ MILLMAN, RP AF OLEARY, MJ MILLMAN, RP TI TECHNICAL MODIFICATIONS OF UVULOPALATOPHARYNGOPLASTY - THE ROLE OF THE PALATOPHARYNGEUS SO LARYNGOSCOPE LA English DT Article ID OBSTRUCTIVE SLEEP-APNEA; EXPERIENCE; MORTALITY; AIRWAY C1 RHODE ISL HOSP,DIV PULM,PROVIDENCE,RI 02902. USN HOSP,DEPT OTOLARYNGOL,SAN DIEGO,CA 92134. RP OLEARY, MJ (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 10 TC 12 Z9 12 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0023-852X J9 LARYNGOSCOPE JI Laryngoscope PD DEC PY 1991 VL 101 IS 12 BP 1332 EP 1335 PN 1 PG 4 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA HC472 UT WOS:A1991HC47200013 PM 1766304 ER PT J AU CULHAM, P AF CULHAM, P TI DOCUMENTS AND DOMUS IN REPUBLICAN ROME SO LIBRARIES & CULTURE LA English DT Article; Proceedings Paper CT SEMINAR ON LIBRARY HISTORY 8 : READING AND LIBRARIES CY MAY 09-11, 1990 CL INDIANA UNIV BLOOMINGTON, BLOOMINGTON, IN SP AMER LIB ASSOC, LIB HIST ROUND TABLE, INDIANA UNIV, SCH LIB & INFORMAT SCI, INDIANA UNIV, CONF BUR, UNIV TEXAS AUSTIN, GRAD SCH LIB & INFORMAT SCI, LIB CONGRESS, CTR BOOK HO INDIANA UNIV BLOOMINGTON RP CULHAM, P (reprint author), USN ACAD,HIST,ANNAPOLIS,MD 21402, USA. NR 22 TC 2 Z9 2 U1 0 U2 0 PU UNIV TEXAS PRESS PI AUSTIN PA BOX 7819, AUSTIN, TX 78713-7819 SN 0894-8631 J9 LIBR CULTURE PD WIN PY 1991 VL 26 IS 1 BP 119 EP 134 PG 16 WC History & Philosophy Of Science SC History & Philosophy of Science GA FK326 UT WOS:A1991FK32600011 ER PT J AU FISH, FE HUI, CA AF FISH, FE HUI, CA TI DOLPHIN SWIMMING - A REVIEW SO MAMMAL REVIEW LA English DT Review ID AXIAL MUSCULATURE; ENERGY-COST; PROPULSION; HYDROMECHANICS; EXPENDITURE; KINEMATICS; LOCOMOTION; PORPOISE; WHALE; SPEED AB Research into dolphin swimming has historically been guided by false assumptions of 'effortless', 'high-speed' swimming. These assumptions have instigated the development of drag-reduction hypotheses but tests of these hypotheses have generally had little success. The autecological approach has dominated recent efforts and has been more successful. In this review we summarize results of decades of research efforts to study these creatures. (1) Drag is minimized primarily by the streamlined shape of the body and appendages, with no known contributions from compliant dampening, dermal ridges, secretions, boundary layer heating, or skin folds. All indications are that the boundary layer is turbulent. (2) Muscles for the upstroke and downstroke of swimming dolphins provide approximately equal power. (3) Output force is enhanced by insertions occurring on the long processes of the vertebrae and on the subdermal connective tissue sheath. (4) Measured swimming speeds are lower than previously believed, with maximum reported routine speeds being approximately 3 m/s. (5) Porpoising behaviour appears to be the most energetically conservative manner in which to breathe when swimming at high speed. (6) Riding surf and wind waves involves the balance between the wave slope and the weight of the animal whereas riding the bow wave involves the interaction of the pressure wave in front of a ship and the drag of the dolphin. C1 USN,CTR OCEAN SYST,CHEM & BIOCHEM BRANCH,SAN DIEGO,CA 92152. RP FISH, FE (reprint author), W CHESTER UNIV,DEPT BIOL,W CHESTER,PA 19383, USA. NR 104 TC 107 Z9 109 U1 2 U2 33 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0305-1838 J9 MAMMAL REV JI Mammal Rev. PD DEC PY 1991 VL 21 IS 4 BP 181 EP 195 DI 10.1111/j.1365-2907.1991.tb00292.x PG 15 WC Zoology SC Zoology GA GY084 UT WOS:A1991GY08400002 ER PT J AU SNAIL, KA MARKS, CM LU, ZP HEBERLEIN, J PFENDER, E AF SNAIL, KA MARKS, CM LU, ZP HEBERLEIN, J PFENDER, E TI HIGH-TEMPERATURE, HIGH-RATE HOMOEPITAXIAL SYNTHESIS OF DIAMOND IN A THERMAL PLASMA REACTOR SO MATERIALS LETTERS LA English DT Article ID GROWTH; DEPOSITION; MECHANISM; CRYSTALS AB Millimeter sized, facetted diamond crystals have been grown epitaxially at temperatures of 1200-1400-degrees-C (+/- 100-degrees-C) in a thermal plasma reactor, using millimeter sized, cylindrical seed crystals. Growth rates of 100-220-mu-m/h were measured; these are the highest ever reported for the epitaxial synthesis of diamond at low pressures. C1 UNIV MINNESOTA,DEPT MECH ENGN,MINNEAPOLIS,MN 55455. RP SNAIL, KA (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6522,WASHINGTON,DC 20375, USA. NR 19 TC 6 Z9 7 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD DEC PY 1991 VL 12 IS 5 BP 301 EP 305 DI 10.1016/0167-577X(91)90105-F PG 5 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HD211 UT WOS:A1991HD21100002 ER PT J AU CLARK, JB GARRETT, RK JUNGLING, TL ASFAHANI, RI AF CLARK, JB GARRETT, RK JUNGLING, TL ASFAHANI, RI TI INFLUENCE OF INITIAL INGOT BREAKDOWN ON THE MICROSTRUCTURAL AND TEXTURAL DEVELOPMENT OF HIGH-PURITY TANTALUM SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID DEEP DRAWING STEELS; ODF-ANALYSIS AB The influence of initial ingot breakdown on the rolling and recrystallization textures of high-purity tantalum plate was investigated using optical microscopy and X-ray diffraction. The four ingot breakdown processes investigated include two commercial processes and two processes new to tantalum. Correlations among the four ingot breakdown processes, the recrystallized grain size, and the final texture were established. Of the four breakdown processes investigated, the plate from the completely upset-forged ingot had the strongest {111} < 110 > and {111} < 112 > texture components, while the plate from the side-forged ingot recrystallized with a mixed texture. Increased upset forging along the ingot centerline strengthened the {111} < uvw > orientations and weakened the {100} < uvw > orientations in the annealed plates. Recrystallization studies were conducted on the rolled plates to develop an optimum texture with both {111} < 110 > and {111} < 112 > texture components in the final recrystallized plate. C1 USS TECH CTR,MONROEVILLE,PA 15146. RP CLARK, JB (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK,MD 20903, USA. NR 10 TC 40 Z9 42 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD DEC PY 1991 VL 22 IS 12 BP 2959 EP 2968 DI 10.1007/BF02650255 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA GU035 UT WOS:A1991GU03500012 ER PT J AU BLACHARSKI, CS HAGSTROM, C STRATTON, M AF BLACHARSKI, CS HAGSTROM, C STRATTON, M TI QUALITY IMPROVEMENT IN NURSING - IMPLEMENTATION OF A COMPREHENSIVE PROGRAM USING COST-EFFECTIVE AUTOMATION SO MILITARY MEDICINE LA English DT Article RP BLACHARSKI, CS (reprint author), USN HOSP,NURSING SERV,SAN DIEGO,CA 92134, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD DEC PY 1991 VL 156 IS 12 BP 666 EP 670 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA GV758 UT WOS:A1991GV75800015 PM 1780067 ER PT J AU MCCAUGHEY, BG AF MCCAUGHEY, BG TI OBSERVATIONS ABOUT BATTLE FATIGUE - ITS OCCURRENCE AND ABSENCE SO MILITARY MEDICINE LA English DT Editorial Material RP MCCAUGHEY, BG (reprint author), USN,HLTH SCI EDUC & TRAINING COMMAND,BETHESDA,MD 20889, USA. NR 0 TC 1 Z9 1 U1 1 U2 2 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 DEC PY 1991 VL 156 IS 12 BP 694 EP 695 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA GV758 UT WOS:A1991GV75800024 PM 1780076 ER PT J AU YOWELL, SK AF YOWELL, SK TI OBESITY AND THE UNITED-STATES-NAVY SO MILITARY MEDICINE LA English DT Letter RP YOWELL, SK (reprint author), USN HOSP,CAMP PENDLETON,CA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD DEC PY 1991 VL 156 IS 12 BP A10 EP A10 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA GV758 UT WOS:A1991GV75800003 PM 1780060 ER PT J AU WIRTZ, JW AF WIRTZ, JW TI COMMAND, CONTROL, AND THE COMMON DEFENSE - ALLARD,CK SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP WIRTZ, JW (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MILLENNIUM-J INT STUD PI LONDON PA LONDON SCHOOL ECONOMICS HOUGHTON ST, LONDON, ENGLAND WC2A 2AE SN 0305-8298 J9 MILLENNIUM-J INT ST JI Millennium-J. Int. Stud. PD WIN PY 1991 VL 20 IS 3 BP 545 EP 546 DI 10.1177/03058298910200030701 PG 2 WC International Relations SC International Relations GA HA981 UT WOS:A1991HA98100020 ER PT J AU MADISON, RD AF MADISON, RD TI THE VICTORIAN FOL-SAGE - COMPARATIVE READINGS ON CARLYLE, EMERSON, MELVILLE, AND CONRAD - LABOSSIERE,CR SO NINETEENTH CENTURY PROSE LA English DT Book Review RP MADISON, RD (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIVERSITY PRESS COLORADO PI NIWOT PA PO BOX 849, NIWOT, CO 80544 SN 0160-4848 J9 NINETEENTH CENTURY P JI Ninet. Century Prose PD WIN PY 1991 VL 18 IS 1 BP 45 EP 47 PG 3 WC Literature SC Literature GA FC655 UT WOS:A1991FC65500008 ER PT J AU DUNCAN, MD MAHON, R TANKERSLEY, LL REINTJES, J AF DUNCAN, MD MAHON, R TANKERSLEY, LL REINTJES, J TI TIME-GATED IMAGING THROUGH SCATTERING MEDIA USING STIMULATED RAMAN AMPLIFICATION SO OPTICS LETTERS LA English DT Article AB We propose the use of stimulated Raman scattering for time-gated image amplification and demonstrate its use for the detection of images through a strongly scattering material. Using 30-ps pulses from a frequency-doubled Nd:YAG laser, we have amplified and detected images through a suspension of nondairy creamer with a spatial resolution of less than 300-mu-m and at concentrations such that the nonscattered extinction ratio was e-33. Our time-gated image amplifier can produce images under conditions in which the scattering medium is sufficiently dense that an image cannot be seen by using multiple exposures on a streak camera or time-integrated exposures on a sensitive, low-noise CCD camera. RP DUNCAN, MD (reprint author), USN,RES LAB,DIV OPT SCI,LASER PHYS BRANCH,CODE 6540,WASHINGTON,DC 20375, USA. NR 9 TC 83 Z9 83 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 DEC 1 PY 1991 VL 16 IS 23 BP 1868 EP 1870 DI 10.1364/OL.16.001868 PG 3 WC Optics SC Optics GA GT347 UT WOS:A1991GT34700020 PM 19784165 ER PT J AU MOELLER, RP BURNS, WK AF MOELLER, RP BURNS, WK TI 1.06-MU-M ALL-FIBER GYROSCOPE WITH NOISE SUBTRACTION SO OPTICS LETTERS LA English DT Article AB An all-fiber gyroscope that uses a 1.06-mu-m multicore Nd-doped fiber source pumped by a laser-diode array is demonstrated. Intensity noise subtraction is used to reduce the excess noise that arises from a source band-width limitation. The random walk coefficient is improved by a factor of 3, to 2.5 X 10(-4) deg square-root h (1-km fiber, 16-cm radius). RP MOELLER, RP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 20 Z9 22 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 DEC 1 PY 1991 VL 16 IS 23 BP 1902 EP 1904 DI 10.1364/OL.16.001902 PG 3 WC Optics SC Optics GA GT347 UT WOS:A1991GT34700032 PM 19784177 ER PT J AU BAIRD, RE DALY, P SAWYER, MH AF BAIRD, RE DALY, P SAWYER, MH TI VARICELLA ARTHRITIS DIAGNOSED BY POLYMERASE CHAIN-REACTION SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Note DE INFECTIOUS ARTHRITIS; VIRAL ARTHRITIS; VARICELLA COMPLICATIONS; VARICELLA ARTHRITIS; POLYMERASE CHAIN REACTION ID COMPLICATING CHICKENPOX; PERICARDITIS C1 UNIV CALIF SAN DIEGO,DEPT PEDIAT,0672 9500 GILMAN DR,LA JOLLA,CA 92093. USN HOSP,DEPT FAMILY PRACTICE,CAMP PENDLETON,CA. RP SAWYER, MH (reprint author), UNIV CALIF SAN DIEGO,DEPT PEDIAT,0672 9500 GILMAN DR,LA JOLLA,CA 92093, USA. NR 26 TC 9 Z9 9 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 DEC PY 1991 VL 10 IS 12 BP 950 EP 952 PG 3 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA GU156 UT WOS:A1991GU15600014 PM 1662797 ER PT J AU YU, HY SANDAY, SC AF YU, HY SANDAY, SC TI DISLOCATIONS IN BIMATERIALS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article AB The solution of the elastic field in a bimaterial due to an infinitestimal dislocation loop of arbitrary orientation is presented. The bimaterial is idealized as two semi-infinite, isotropic, elastic solids either perfectly bonded or in frictionless contact with each other at the planar interface. The solution is simply the linear superposition of the solutions for the nuclei of strain in a bimaterial. The elastic field of a dislocation line, or a dislocation loop of arbitrary shape, orientation and Burgers vector can be obtained by integrating these results over the surface of the cut formally used to generate the dislocation. The elastic fields due to screw and edge dislocations with line vectors parallel to the planar interface are also presented. It is shown that existing solutions are special cases of the present general solution. RP YU, HY (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 10 Z9 10 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD DEC PY 1991 VL 64 IS 6 BP 1225 EP 1237 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA GU162 UT WOS:A1991GU16200003 ER PT J AU GUHA, S PEEBLES, D WIETING, T GILARDI, R NORTON, M AF GUHA, S PEEBLES, D WIETING, T GILARDI, R NORTON, M TI METAL-INSULATOR-TRANSITION IN BA1-XKXBIO3 SO PHYSICA C LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY : HIGH TEMPERATURE SUPERCONDUCTORS CY JUL 22-26, 1991 CL KANAZAWA, JAPAN SP CITY KANAZAWA, ISHIKAWA PREFECTURE ID BAPB1-XBIXO3 AB Raman and infrared measurements were conducted on Ba1-xKxBiO3 single crystals as a function of potassium concentration x. The sample with x = 0.5 was found to superconduct below 32 K, while the other two samples with x = 0.2 and 1.0 were semiconducting and insulating, respectively. The observed peaks in these samples are tentatively assigned to lattice phonons. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 5 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 991 EP 992 DI 10.1016/0921-4534(91)91719-K PN 2 PG 2 WC Physics, Applied SC Physics GA GW830 UT WOS:A1991GW83000130 ER PT J AU RAJAGOPAL, AK JHA, SS AF RAJAGOPAL, AK JHA, SS TI PAIRING IN LAYERED SUPERCONDUCTORS IN THE PRESENCE OF A MAGNETIC-FIELD SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB Within the framework of the recently developed formalism for describing superconductivity in layered crystals, the intralayer pairing in the presence of a homogeneous magnetic field is examined. With phenomenological interlayer and intralayer couplings introduced by us earlier for different classes of high-T(c) materials, the effect of the magnetic field on T(c) and the variation of the upper critical field H(c2) as a function of temperature are discussed. Explicit results are presented for the case of the magnetic field perpendicular to the layers, in the clean limit. C1 TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 1543 EP 1544 DI 10.1016/0921-4534(91)90898-9 PN 3 PG 2 WC Physics, Applied SC Physics GA GX308 UT WOS:A1991GX30800064 ER PT J AU MILLER, MM OSOFSKY, MS SOULEN, RJ WOLF, SA COHN, JL SKELTON, EF VANDERAH, TA AF MILLER, MM OSOFSKY, MS SOULEN, RJ WOLF, SA COHN, JL SKELTON, EF VANDERAH, TA TI CHARACTERISTIC H-T BOUNDARIES AND DISSIPATION IN YBA2CU3O7-DELTA CRYSTALS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB Characteristic H-T boundaries of a YBa2Cu3O7-delta crystal were determined from V(I) measurements for 0 less-than-or-equal-to H less-than-or-equal-to 6T with H parallel-to ab and H parallel-to c. These boundaries have the form H approximately (T(c)-T)x where x can be consistent with predictions of the vortex-glass model. However, such a temperature dependence is also consistent with an alternate, granular superconductor model. Furthermore, magnetization and resistivity measurements suggest that a granular, percolating superconductor model is more appropriate than the vortex-glass model. C1 USN,CTR WEAP,CHINA LAKE,CA 93555. RP MILLER, MM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009; Osofsky, Michael/A-1050-2010 NR 9 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 2229 EP 2230 DI 10.1016/0921-4534(91)91239-Z PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900048 ER PT J AU HOR, PH BECHTOLD, J XUE, YY CHU, CW HUNGERFORD, EV MARUYAMA, XK BACKE, H BUSKIRK, FR CONNORS, SM JEAN, YC FARMER, JW AF HOR, PH BECHTOLD, J XUE, YY CHU, CW HUNGERFORD, EV MARUYAMA, XK BACKE, H BUSKIRK, FR CONNORS, SM JEAN, YC FARMER, JW TI IRRADIATION EFFECTS ON FLUX PINNING AND JC IN HIGH-TEMPERATURE SUPERCONDUCTORS SO PHYSICA C LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MATERIALS AND MECHANISMS OF SUPERCONDUCTIVITY HIGH TEMPERATURE SUPERCONDUCTORS 3 CY JUL 22-26, 1991 CL KANAZAWA, JAPAN AB We have introduced neutron and electron irradiation defects in bulk YBCO melt-textured materials. The defects and their effect on the critical current density (J(c)) have been examined. The enhancement of J(c) is found to be heavily dependent on the type and energy of the beam as well as on the direction of the beam with respect to the crystal. Two types of defects have been identified in neutron irradiated YBCO by positron annihilation experments. The large defects (approximately 20 angstrom) correlate with the enhancement of J(c) and are 10(3) times more effective in flux pinning than point defects. C1 UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77204. USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. UNIV MISSOURI,DEPT CHEM,KANSAS CITY,MO 64110. UNIV MISSOURI,COLUMBIA,MO 65211. RP HOR, PH (reprint author), UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204, USA. NR 4 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1991 VL 185 BP 2311 EP 2312 DI 10.1016/0921-4534(91)91280-H PN 4 PG 2 WC Physics, Applied SC Physics GA GX309 UT WOS:A1991GX30900089 ER PT J AU ALBANO, AM PASSAMANTE, A FARRELL, ME AF ALBANO, AM PASSAMANTE, A FARRELL, ME TI USING HIGHER-ORDER CORRELATIONS TO DEFINE AN EMBEDDING WINDOW SO PHYSICA D LA English DT Article ID SINGULAR-VALUE DECOMPOSITION; FRACTAL DIMENSION; STRANGE ATTRACTORS; TIME-SERIES AB Correlation functions of up to fourth order are investigated numerically in search of a reliable window for embedding or reconstructing chaotic flows by the method of time delays. A number of these higher-order correlations display coincident extrema. The time at which this coincidence occurs is shown to be a reasonable embedding window for calculating the correlation dimension of a number of well-known chaotic attractors. C1 USN,CTR AIR DEV,WARMINSTER,PA 18974. RP ALBANO, AM (reprint author), BRYN MAWR COLL,DEPT PHYS,BRYN MAWR,PA 19010, USA. NR 27 TC 50 Z9 57 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD DEC PY 1991 VL 54 IS 1-2 BP 85 EP 97 DI 10.1016/0167-2789(91)90110-U PG 13 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA HC267 UT WOS:A1991HC26700009 ER PT J AU EKBERG, JO REDFORS, A BROWN, CM FELDMAN, U SEELY, JF AF EKBERG, JO REDFORS, A BROWN, CM FELDMAN, U SEELY, JF TI TRANSITIONS AND ENERGY-LEVELS IN AL-LIKE GE-XX, SE-XXII, SR-XXVI, Y-XXVII AND ZR-XXVIII SO PHYSICA SCRIPTA LA English DT Article ID ISOELECTRONIC SEQUENCE; N=2 CONFIGURATIONS; MG-LIKE; SPECTRA; VALUES; FOIL; IONS; COMPLEX; PLASMAS AB Transitions in Ge XX, Se XXII, Sr XXVI, Y XXVII and Zr XXVIII were identified in the extreme-ultraviolet spectra emitted from linear plasmas that were produced using line-focused laser beams. A grazing-incidence spectrograph viewed the plasma in the axial direction. Transitions between levels of the three odd configurations 3s(2)3p, 3p3 and 3s3p3d and the even 3s3p2 and 3s(2)3d were identified and the wavelengths in the range 90-220 angstrom were measured with an uncertainty of about 0.010 angstrom. Energy values, determined from the observed combinations were compared with values obtained from multi-configuration Dirac-Fock calculations. Fitted energy levels of 3p3 and 3s3p3d are also presented for elements between Cu and Rb. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP EKBERG, JO (reprint author), UNIV LUND,DEPT PHYS,S-22362 LUND,SWEDEN. RI Redfors, Andreas/G-8461-2014 OI Redfors, Andreas/0000-0003-4792-8749 NR 23 TC 17 Z9 17 U1 0 U2 1 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PD DEC PY 1991 VL 44 IS 6 BP 539 EP 547 DI 10.1088/0031-8949/44/6/005 PG 9 WC Physics, Multidisciplinary SC Physics GA GW689 UT WOS:A1991GW68900005 ER PT J AU DELARIPELLE, MF HAFTEL, MI LARSEN, SY AF DELARIPELLE, MF HAFTEL, MI LARSEN, SY TI POTENTIAL-HARMONIC EXPANSION FOR ATOMIC WAVE-FUNCTIONS SO PHYSICAL REVIEW A LA English DT Article ID INTEGRO-DIFFERENTIAL EQUATION; VARIATIONAL CALCULATIONS; EXPECTATION VALUES; BODY SYSTEMS; FEW-BODY; CONVERGENCE; HELIUM; STATE; RATES AB One way to reduce the large degeneracy of the hyperspherical-harmonic basis for solving few- and many-body bound-state problems is to introduce an optimal basis truncation called the potential-harmonic (PH) basis. In this paper we introduce various potential-harmonic truncation schemes and assess their accuracies in predicting the energies of the helium and H- ground states and the excited 2(1)S level of the helium atom. We first find that the part of the PH basis that accounts for one-body correlations gives a better ground-state energy for He than Hartree-Fock (2.8790 a.u. versus 2.8617 for Hartree-Fock and 2.9037 exact). When an orthogonal complement is introduced to the basis to account for e-e correlations, we find that the error in the binding energy is 0.000 25 a.u., and 0.000 15 a.u. for ground-state and excited helium, and 0.000 35 a.u. for H-. Furthermore, the PH truncation is about 99.9% accurate in accounting for contributions coming from large values of the global angular momentum. This PH scheme is also much more accurate than previous versions based on the Faddeev equations. The present results indicate that the PH truncation can render the hyperspherical-harmonic method useful for systems with N > 3. C1 USN,RES LAB,WASHINGTON,DC 20375. TEMPLE UNIV,DEPT PHYS,PHILADELPHIA,PA 19122. RP DELARIPELLE, MF (reprint author), INST PHYS NUCL,DIV PHYS NUCL,F-91406 ORSAY,FRANCE. NR 29 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7084 EP 7091 DI 10.1103/PhysRevA.44.7084 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200017 ER PT J AU KRIVEC, R HAFTEL, MI MANDELZWEIG, VB AF KRIVEC, R HAFTEL, MI MANDELZWEIG, VB TI PRECISE NONVARIATIONAL CALCULATION OF EXCITED-STATES OF HELIUM WITH THE CORRELATION-FUNCTION HYPERSPHERICAL-HARMONIC METHOD SO PHYSICAL REVIEW A LA English DT Article ID MATRIX-ELEMENTS; VARIATIONAL CALCULATIONS; ISOELECTRONIC SEQUENCE; COUPLED EQUATIONS; WAVE-FUNCTIONS; POTENTIALS; EXPANSION; IONS AB A direct solution of the Schrodinger equation for the 2(1)S, 3(1)S, 4(1)S, and 5(1)S states of the helium atom is obtained with the correlation-function hyperspherical-harmonic (CFHH) method. Given the proper correlation function chosen from physical considerations, the method generates wave functions accurate in the whole range of interparticle distances that lead, in turn, to precise estimates of the expectation values of the Hamiltonian and of different functions of interparticle distances. Our results show that even with the simplest correlation function, the accuracy of the CFHH method (which contains no adjustable parameters) for excited states is comparable to that of the ground state. The accuracy is also comparable to that of the most sophisticated variational calculations involving hundreds of variational parameters. C1 J STEFAN INST,YU-61111 LJUBLJANA,YUGOSLAVIA. USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. RP KRIVEC, R (reprint author), MAX PLANCK INST NUCL PHYS,POSTFACH 103980,W-6900 HEIDELBERG 1,GERMANY. NR 35 TC 20 Z9 20 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1991 VL 44 IS 11 BP 7158 EP 7164 DI 10.1103/PhysRevA.44.7158 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GU882 UT WOS:A1991GU88200022 ER PT J AU MOULTON, NE WOLF, SA SKELTON, EF LIEBENBERG, DH VANDERAH, TA HERMANN, AM DUAN, HM AF MOULTON, NE WOLF, SA SKELTON, EF LIEBENBERG, DH VANDERAH, TA HERMANN, AM DUAN, HM TI PRESSURE-DEPENDENCE OF TC IN TL2BA2CACU2O8 AT HYDROSTATIC PRESSURES TO 6 GPA SO PHYSICAL REVIEW B LA English DT Note ID SUPERCONDUCTOR YBA2CU4O8; TRANSITION-TEMPERATURE; CARRIER CONCENTRATION AB We report the results of experiments carried out on single crystals of Tl2Ba2CaCu2O8 under nearly hydrostatic pressure conditions to 6 GPa. The critical temperature, T(c), is observed to possess a non-linear pressure dependence. While the increase of T(c) with increasing oxygen concentration in YBa2Ca3O7-delta is consistent with the observation of increasing T(c) with increasing pressure, the Tl2Ba2CaCu2O8 system demonstrates an increasing T(c) with decreasing oxygen content, but has a positive dT(c)/dP at low pressures. This behavior is clearly inconsistent with the picture applied to the Y-BaCuO system. In all the present measurements the curvature is downward and, in fact, for one sample it actually decreases. A theoretical explanation based upon the strong-coupling Eliashberg form of the BCS theory is put forth to ex lain this effect. C1 OFF NAVAL RES,ARLINGTON,VA 22217. USN,CTR WEAP,CHINA LAKE,CA 93555. UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. RP MOULTON, NE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 21 TC 18 Z9 18 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 DEC 1 PY 1991 VL 44 IS 22 BP 12632 EP 12634 DI 10.1103/PhysRevB.44.12632 PG 3 WC Physics, Condensed Matter SC Physics GA GT902 UT WOS:A1991GT90200070 ER PT J AU HUBA, JD AF HUBA, JD TI THEORY AND SIMULATION OF A HIGH-FREQUENCY MAGNETIC DRIFT WAVE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MAGNETOTAIL BARIUM RELEASES; RAYLEIGH-TAYLOR INSTABILITY; LARGE-LARMOR-RADIUS; INTERCHANGE INSTABILITY; ABSORPTION; LIMIT AB A theoretical and computational study of a high-frequency magnetic drift mode are presented. A fluid theory based upon the resistive magnetohydrodynamic (MHD) equations, which include the Hall term, as well as a kinetic theory based upon the Vlasov equation, are developed. The fluid theory is valid in the regime omega < omega-lh (where omega-lh is the lower hybrid frequency), and yields an approximate dispersion equation omega congruent-to k(y) V(A)2/L(n)OMEGA(i)-i-eta-k(y)2, where k(y) is the wave number transverse to B0 and the density gradient, V(A) is the Alfven velocity, L(n) is the density gradient scale length, and eta is the resistivity. This dispersion equation is valid in the limit L(n) much less than V(A)/OMEGA(i). Using kinetic theory it is shown that the drift mode transitions to the lower hybrid mode in the limit omega greater-than-or-similar-to omega-lh. The simulation study is based upon the modified MHD equations and the nonlocal nature of the mode is investigated. Applications to sub-Alfvenic plasma expansions, electromagnetic waves in the Earth's magnetosphere, and plasma switches are discussed. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 30 TC 36 Z9 36 U1 3 U2 4 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 DEC PY 1991 VL 3 IS 12 BP 3217 EP 3225 DI 10.1063/1.859752 PG 9 WC Physics, Fluids & Plasmas SC Physics GA GT586 UT WOS:A1991GT58600001 ER PT J AU DAHLBURG, JP GARDNER, JH EMERY, MH AF DAHLBURG, JP GARDNER, JH EMERY, MH TI SIMULATION OF THE RAYLEIGH-TAYLOR INSTABILITY IN COLLIDING, ABLATIVELY DRIVEN LASER FOILS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID STRATIFIED FLUIDS; GROWTH; TARGETS; FUSION; STABILITY; PLASMAS AB This paper reports results from a series of numerical simulations of a pair of independently accelerated rectilinear foils in the presence of the ablative Rayleigh-Taylor (RT) instability on the laser-side surfaces. The foil thickness and laser intensity are chosen to be in the range relevant to high-gain inertial fusion pellets, with 80-mu-m thick plastic (CH) foils accelerated toward each other from a separation distance of 650-mu-m by a 1/4-mu-m laser beam with an intensity of 3 X 10(14) W/cm2. At early times the foils are physically well separated from one another, and evolve independently in a way that is fully consistent with the previously studied evolution of ablatively RT unstable planar targets [Gardner et al., Phys. Fluids B 3, 1070 (1991)]. Subsequently, pressure builds up in the region between the foils, causing them to decelerate. This stabilizes the RT growth on the laser sides, while driving the RT instability on the inner sides. For thin foils, laser-side RT bubbles become rapidly growing inner surface RT spikes which mix and coalesce as the foils are pressed together. RP DAHLBURG, JP (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 30 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1991 VL 3 IS 12 BP 3485 EP 3493 DI 10.1063/1.859726 PG 9 WC Physics, Fluids & Plasmas SC Physics GA GT586 UT WOS:A1991GT58600027 ER PT J AU OGDEN, TR AF OGDEN, TR TI ANODIZED AL COATINGS - THERMAL CONDUCTORS OR BARRIERS SO PLATING AND SURFACE FINISHING LA English DT Letter RP OGDEN, TR (reprint author), USN,CTR OCEAN SYST,PROP & HYDROMECH BRANCH,SAN DIEGO,CA 92152, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD DEC PY 1991 VL 78 IS 12 BP 34 EP 34 PG 1 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA GU474 UT WOS:A1991GU47400004 ER PT J AU RUDOLPH, AS KLIPPER, RW GOINS, B PHILLIPS, WT AF RUDOLPH, AS KLIPPER, RW GOINS, B PHILLIPS, WT TI INVIVO BIODISTRIBUTION OF A RADIOLABELED BLOOD SUBSTITUTE - TC-99M-LABELED LIPOSOME-ENCAPSULATED HEMOGLOBIN IN AN ANESTHETIZED RABBIT SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID INDUCED CARDIOTOXICITY; DELIVERY; MICE; ADRIAMYCIN; BINDING; SYSTEM; DRUGS AB Liposome-encapsulated hemoglobin (LEH) is an erythrocyte substitute that is a potential resuscitative fluid for the in vivo delivery of oxygen. We have noninvasively imaged radiolabeled LEH in vivo with technetium-99m (Tc-99m) to study the biodistribution in an anesthetized rabbit. Rabbits (2.5 kg, n = 8) were infused with 30 ml of LEH (200 mg of phospholipid, 2.5 g of hemoglobin per kg of body weight) and imaged with a gamma-camera continuously for 2 hr. At 20 hr postinfusion, the animals were imaged again and sacrificed; the organs were weighed and their radioactivity was determined for autopsy organ distribution. Organ uptake from the images was corrected for organ-associated blood pool, which was determined by infusion of Tc-99m-labeled rabbit erythrocytes. Blood pool and decay-corrected biodistribution data reveal the kinetics of LEH distribution, with an initial rapid uptake by the liver, 8% at 30 min and 15% at 2 hr. The spleen accumulates less LEH initially, 3% at 30 min and 7% at 2 hr, with an apparent linear uptake of LEH over this time period. Image biodistribution data was also validated at 20 hr by tissue sampling. At 20 hr postinfusion, autopsy biodistribution data reveals approximately 42.6% of the total counts remaining in the blood, 15.4% in the liver, 18.1% in spleen, 3.2% in the lungs, 2.4% in muscle, 1.6% in urine, and trace levels in the kidney, brain, and heart (< 1%). There is no evidence of hemoglobin release from LEH or kidney dysfunction (normal creatinine and blood urea nitrogen) at any time over the course of the study. C1 UNIV TEXAS,HLTH SCI CTR,DEPT RADIOL,SAN ANTONIO,TX 78284. RP RUDOLPH, AS (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. RI Goins, Beth/F-1311-2010; Phillips, William/E-8427-2010 OI Phillips, William/0000-0001-8248-7817 NR 35 TC 82 Z9 82 U1 0 U2 2 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 DEC PY 1991 VL 88 IS 23 BP 10976 EP 10980 DI 10.1073/pnas.88.23.10976 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GT480 UT WOS:A1991GT48000125 PM 1961766 ER PT J AU COLETTA, PE AF COLETTA, PE TI PRELUDE TO WAR - JAPAN, THE UNITED-STATES, AND THE AIRCRAFT-CARRIER, 1919-1945 SO PROLOGUE-QUARTERLY OF THE NATIONAL ARCHIVES LA English DT Article RP COLETTA, PE (reprint author), USN ACAD,HIST,ANNAPOLIS,MD 21402, USA. NR 35 TC 1 Z9 1 U1 0 U2 0 PU NATL ARCHIVES TRUST FUND BOARD PI WASHINGTON PA WASHINGTON, DC 20408 SN 0033-1031 J9 PROLOGUE JI Prologue-Q. Natl. Archives PD WIN PY 1991 VL 23 IS 4 BP 343 EP 359 PG 17 WC History SC History GA GU470 UT WOS:A1991GU47000002 ER PT J AU MCCLINTOCK, WR AF MCCLINTOCK, WR TI CLIO MOBILIZES - NAVAL RESERVE HISTORIANS DURING THE WORLD-WAR-2 SO PUBLIC HISTORIAN LA English DT Article RP MCCLINTOCK, WR (reprint author), USN RESERVE,SUPPLY CORPS,WASHINGTON,DC, USA. NR 113 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALIF PRESS PI BERKELEY PA JOURNALS DEPT 2120 BERKELEY WAY, BERKELEY, CA 94720 SN 0272-3433 J9 PUBL HISTORIAN JI Public Hist. PD WIN PY 1991 VL 13 IS 1 BP 25 EP 46 PG 22 WC History SC History GA FG517 UT WOS:A1991FG51700002 ER PT J AU PEYSER, TA ANTONIADES, JA MYERS, MC LAMPE, M PECHACEK, RE MURPHY, DP MEGER, RA AF PEYSER, TA ANTONIADES, JA MYERS, MC LAMPE, M PECHACEK, RE MURPHY, DP MEGER, RA TI A SEGMENTED CONCENTRIC FARADAY CUP FOR MEASUREMENT OF TIME-DEPENDENT RELATIVISTIC ELECTRON-BEAM PROFILES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID PULSES AB A multi-element segmented concentric Faraday collector has been developed for measuring the time evolution of the beam half-current radius (a 1/2) of an intense relativistic electron beam. Each collector segment measures the total current within its radius. The data analysis procedure fits the data from all five segments at a given time to a prescribed beam profile and calculates a1/2 from the parameters of the fitted curves. The effect of beam centroid offsets on the data analysis was investigated numerically. Beam centroid offsets as large as half the beam radius produce only a 10% error in the experimental measurement of a1/2. The use of a thin graphite overlayer followed by range-thick stainless steel reduces scattering from one collector element to the next. The instrument has been used extensively on the SuperIBEX relativistic electron beam accelerator for measurement of the half-current radius as a function of time. Radius variations in excess of 4:1 have been measured over the duration of the beam pulse for beams with 5-MeV energy, 20-kA peak current and 1-cm final half-current radii. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD. RP PEYSER, TA (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 25 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1991 VL 62 IS 12 BP 2895 EP 2903 DI 10.1063/1.1142178 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GV901 UT WOS:A1991GV90100007 ER PT J AU MILLER, JD NGUYEN, KT SCHNEIDER, RF STRUVE, KW WEIDMAN, DJ AF MILLER, JD NGUYEN, KT SCHNEIDER, RF STRUVE, KW WEIDMAN, DJ TI PULSE SHAPING A HIGH-CURRENT RELATIVISTIC ELECTRON-BEAM IN VACUUM SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A simple method for shaping the output current pulse of a relativistic electron beam in vacuum is presented. This method has been employed to sharpen the rise time of a high-current relativistic electron beam produced by a 2-MV, 7-kA, 20-ns pulser. The beam has a pulse shape that is approximately triangular both in voltage and current, with a negligible instantaneous energy spread. The desired pulse shape is nominally rectangular in current. The technique utilizes a magnetic lens with a magnitude of approximately 1.5 kG to focus the beam. Passing beam electrons through the magnetic lens causes them to focus at different axial locations downstream from the lens depending upon their energy. The focal point of the beam current peak (corresponding to maximum energy) is then located furthest downstream. An aperture is used near the focus to select a portion of the beam having the desired parameters. C1 MISSION RES CORP,NEWINGTON,VA 22122. ADV TECHNOL & RES,LAUREL,MD 20707. RP MILLER, JD (reprint author), USN,CTR SURFACE WEAP,SILVER SPRING,MD 20910, USA. NR 17 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1991 VL 62 IS 12 BP 2910 EP 2915 DI 10.1063/1.1142180 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GV901 UT WOS:A1991GV90100009 ER PT J AU BEY, PP LEVINE, MD YONCE, DJ FARE, TL AF BEY, PP LEVINE, MD YONCE, DJ FARE, TL TI AUTONULLING AC BRIDGE FOR ACCURATE MEASUREMENT OF SMALL IMPEDANCE VARIATIONS USING MOS COMPONENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SILICON AB A self-contained prototype of an autonulling ac bridge based on phase-sensitive detection is discussed. The bridge nulling circuit uses an analog feedback network to establish a stable null for a wide range of resistive and capacitive values and requires minimal supporting hardware. Changes in resistance and capacitance in one arm of the bridge are compensated independently using a discrete voltage-variable resistor and capacitor in the alternate arm for nulling. The feedback voltage to the discrete control elements can be used to transduce signals from pressure, temperature, or chemical sensors. This bridge is especially well suited for microfabrication and is readily compatible with silicon-based sensors. It offers high noise rejection due to the phase-sensitive measurement taken differentially across the bridge nodes. State-space analysis is used to demonstrate the stability of this feedback network design. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. RP BEY, PP (reprint author), GEOCENTERS INC,10903 INDIAN HEAD HIGHWAY,FT WASHINGTON,MD 20744, USA. NR 19 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1991 VL 62 IS 12 BP 3082 EP 3088 DI 10.1063/1.1142157 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GV901 UT WOS:A1991GV90100040 ER PT J AU VANDEMARK, B AF VANDEMARK, B TI GENERAL OF THE ARMY - MARSHALL,GEORGE,C., SOLDIER AND STATESMAN - CRAY,E SO REVIEWS IN AMERICAN HISTORY LA English DT Book Review RP VANDEMARK, B (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV PRESS PI BALTIMORE PA JOURNALS PUBLISHING DIVISION, 2715 NORTH CHARLES ST, BALTIMORE, MD 21218-4319 SN 0048-7511 J9 REV AM HIST JI Rev. Am. Hist. PD DEC PY 1991 VL 19 IS 4 BP 576 EP 580 DI 10.2307/2703300 PG 5 WC History SC History GA GV184 UT WOS:A1991GV18400024 ER PT J AU WERKING, RH AF WERKING, RH TI A CRITICAL-LOOK AT POSSIBILITIES FOR AND OBSTACLES TO LIBRARY USE SO RQ LA English DT Article; Proceedings Paper CT 1987 ANNUAL CONVENTION OF THE ORGANIZATION OF AMERICAN HISTORIANS CY APR, 1987 CL PHILADELPHIA, PA SP ORG AMER HISTORIANS RP WERKING, RH (reprint author), USN ACAD,LIB,ANNAPOLIS,MD 21402, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU AMER LIBRARY ASSN PI CHICAGO PA 50 E HURON ST, CHICAGO, IL 60611 SN 0033-7072 J9 RQ JI RQ PD WIN PY 1991 VL 31 IS 2 BP 162 EP 166 PG 5 WC Information Science & Library Science SC Information Science & Library Science GA GX757 UT WOS:A1991GX75700003 ER PT J AU BABKOFF, H CASPY, T MIKULINCER, M AF BABKOFF, H CASPY, T MIKULINCER, M TI SUBJECTIVE SLEEPINESS RATINGS - THE EFFECTS OF SLEEP-DEPRIVATION, CIRCADIAN RHYTHMICITY AND COGNITIVE PERFORMANCE SO SLEEP LA English DT Article DE SLEEPINESS; SLEEP DEPRIVATION; CIRCADIAN RHYTHMICITY; COGNITIVE PERFORMANCE ID SCALE; TASK AB Computerized self-report sleepiness scales were administered before and after cognitive testing in a 72-hour sleep deprivation study. The cognitive test battery was administered every 2 hours and took approximately 1-1.25 hours. Two computerized measures of subjective sleepiness were used, one a visual analog scale, the other a Hebrew version of the Stanford sleepiness scale. The results indicated that both accumulated sleep loss, circadian and ultradian (2 cycles/day) factors were significant in determining subjective estimates of sleepiness. The extent of the differences between subjective sleepiness ratings before cognitive testing and after testing was dependent upon the phase of the circadian cycle. These differences were greatest at approximately 0200-0600 hours and least around 1000 hours. A second low point occurred at 1800-2000 hours. Analysis by complex demodulation of the individual subjects' sleepiness rating curves indicated that the amount of variance accounted for by the circadian component increased significantly after cognitive testing. C1 USN,HLTH RES CTR,SAN DIEGO,CA 92138. RP BABKOFF, H (reprint author), BAR ILAN UNIV,DEPT PSYCHOL,RAMAT GAN,ISRAEL. NR 24 TC 73 Z9 82 U1 3 U2 9 PU AMER SLEEP DISORDERS ASSOC PI ROCHESTER PA 1610 14TH STREET NW SUITE 300, ROCHESTER, MN 55806 SN 0161-8105 J9 SLEEP JI Sleep PD DEC PY 1991 VL 14 IS 6 BP 534 EP 539 PG 6 WC Clinical Neurology; Neurosciences SC Neurosciences & Neurology GA HB606 UT WOS:A1991HB60600010 PM 1798887 ER PT J AU RYAN, RL MALL, S AF RYAN, RL MALL, S TI INTERACTION OF A CRACK WITH A PAIR OF THIN, ELASTIC INCLUSIONS SO THEORETICAL AND APPLIED FRACTURE MECHANICS LA English DT Article AB The influence of a pair of thin, elastic inclusions on the stress intensity at a crack tip is considered. The interaction problem is formulated as a set of coupled singular integral equations and the solution is obtained by the Gauss-Chebyshev numerical technique. The stress intensity is computed as a function of certain geometric and elastic parameters of the inclusions, and the toughening effect of these parameters is evaluated. C1 WRIGHT PATTERSON AFB,DAYTON,OH. RP RYAN, RL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8442 J9 THEOR APPL FRACT MEC JI Theor. Appl. Fract. Mech. PD DEC PY 1991 VL 16 IS 3 BP 255 EP 261 DI 10.1016/0167-8442(91)90049-P PG 7 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA GX295 UT WOS:A1991GX29500006 ER PT J AU LONDONO, JA SEDEGAH, M CHAROENVIT, Y BEAUDOIN, RL DRUILHE, P AF LONDONO, JA SEDEGAH, M CHAROENVIT, Y BEAUDOIN, RL DRUILHE, P TI ANTIGENIC ANALYSIS OF PLASMODIUM-YOELII LIVER STAGES BY FLUORESCENCE ANTIBODY-ASSAYS SO TROPICAL MEDICINE AND PARASITOLOGY LA English DT Article ID BERGHEI; IMMUNOFLUORESCENT; SPOROZOITES AB Little is known about the immune response against liver stage antigens which were first described for Plasmodium falciparum. in order to provide a basis for experimental studies, we analysed antigenically the liver stages of Plasmodium yoelii using sera of restricted specificity. Several distinct fluorescence patterns could be described in maturing liver forms. One pattern was identified as corresponding to antigens specific to the liver phase which are also species specific. Another pattern corresponds to sporozoite surface antigens which were predominant in liver trophozoites. Trophozoite-like liver forms were detected at least 7 days after the injection of irradiated sporozoites suggesting that parasites may persist and contribute to the immunity induced by this procedure. C1 INST PASTEUR,28 RUE DOCTEUR ROUX,F-75724 PARIS 15,FRANCE. USN,DIV MALARIA,BETHESDA,MD. NR 11 TC 6 Z9 6 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 DEC PY 1991 VL 42 IS 4 BP 381 EP 385 PG 5 WC Parasitology; Tropical Medicine SC Parasitology; Tropical Medicine GA GY767 UT WOS:A1991GY76700014 PM 1724570 ER PT J AU VASUDEVAN, N AF VASUDEVAN, N TI THE LOW-FREQUENCY SCATTER OF SH-WAVES BY A ROUGH INTERFACE IN AN ELASTIC PLATE SO WAVE MOTION LA English DT Article ID REFLECTION AB The study of the reflection and transmission of low frequency SH waves incident upon a rough interface in an elastic plate is undertaken by employing a theory of acoustic wave scattering from rough surfaces originally due to Biot and subsequently generalised to the case of elastic media. In this theory the interface is replaced by a distribution of voids/asperities whose individual size is small compared to the excitation wavelength. We plot the absolute values of the reflection and transmission coefficients versus frequency when a single symmetric SH plate mode is used as the input excitation. The different types of inclusions are used to simulate the rough surface are the hollow, fluid filled and aluminum spheres. Lastly, the loss of energy due to scattering is also estimated for the different inclusion distributions considered. RP VASUDEVAN, N (reprint author), USN,POSTGRAD SCH,DEPT MATH,CODE 53VA,MONTEREY,CA 93943, USA. NR 22 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2125 J9 WAVE MOTION JI Wave Motion PD DEC PY 1991 VL 14 IS 4 BP 333 EP 345 DI 10.1016/0165-2125(91)90029-N PG 13 WC Acoustics; Mechanics; Physics, Multidisciplinary SC Acoustics; Mechanics; Physics GA GT906 UT WOS:A1991GT90600003 ER PT J AU UHLMANN, JK AF UHLMANN, JK TI SATISFYING GENERAL PROXIMITY SIMILARITY QUERIES WITH METRIC TREES SO INFORMATION PROCESSING LETTERS LA English DT Article DE COMPUTATIONAL GEOMETRY; SEARCH TREES; PATTERN RECOGNITION; METRIC SPACES AB Divide-and-conquer search strategies are described for satisfying proximity queries involving arbitrary distance metrics. RP UHLMANN, JK (reprint author), USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375, USA. NR 9 TC 233 Z9 240 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0020-0190 J9 INFORM PROCESS LETT JI Inf. Process. Lett. PD NOV 25 PY 1991 VL 40 IS 4 BP 175 EP 179 DI 10.1016/0020-0190(91)90074-R PG 5 WC Computer Science, Information Systems SC Computer Science GA GW212 UT WOS:A1991GW21200001 ER PT J AU ROBERTSON, DH BRENNER, DW WHITE, CT AF ROBERTSON, DH BRENNER, DW WHITE, CT TI SPLIT SHOCK-WAVES FROM MOLECULAR-DYNAMICS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHASE-TRANSFORMATIONS; DISSOCIATION; EQUILIBRIUM; SIMULATIONS; PRESSURE; NITROGEN AB We show that the generation and evolution of split shock waves resulting from a dissociative polymorphic phase transition can be modeled using molecular-dynamics (MD) simulations. A model 2D semi-infinite molecular solid, driven with a piston, exhibits both single and split shock waves depending on the piston velocity. The results obtained from these MD simulations are in excellent agreement with continuum theory. These results-explicitly treating fewer than 5000 atoms-demonstrate that MD simulations provide a promising tool for studying the interplay between shock waves and polymorphic phase transitions. RP ROBERTSON, DH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 21 TC 66 Z9 67 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 25 PY 1991 VL 67 IS 22 BP 3132 EP 3135 DI 10.1103/PhysRevLett.67.3132 PG 4 WC Physics, Multidisciplinary SC Physics GA GR170 UT WOS:A1991GR17000023 ER PT J AU RAO, MV KRUPPA, W DIETRICH, HB BINARI, SC BOOS, JB AF RAO, MV KRUPPA, W DIETRICH, HB BINARI, SC BOOS, JB TI GAAS VERTICAL PIN DIODE USING MEV IMPLANTATION SO ELECTRONICS LETTERS LA English DT Article DE DIODES; SEMICONDUCTOR DEVICES AND MATERIALS AB Vertical pin diodes were fabricated using MeV Si/S coimplantation and keV Be/P coimplantation into undoped semiinsulating GaAs to obtain buried n+ and surface p+ regions, respectively. An exploratory device with a 500 x 500-mu-m2 junction area and a 3-mu-m thick intrinsic region had a breakdown voltage of 70 V, reverse leakage current density of 40-mu-A/cm2 at 20 V, an off-state capacitance of 3.9 nF/cm2 and a DC forward resistance of 2.4-OMEGA at 100 mA. C1 SFA INC,LANDOVER,MD 20789. USN,RES LAB,WASHINGTON,DC 20375. RP RAO, MV (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD NOV 21 PY 1991 VL 27 IS 24 BP 2265 EP 2267 DI 10.1049/el:19911401 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA GU370 UT WOS:A1991GU37000041 ER PT J AU KARPEN, JT ANTIOCHOS, SK DEVORE, CR AF KARPEN, JT ANTIOCHOS, SK DEVORE, CR TI CORONAL CURRENT-SHEET FORMATION - THE EFFECT OF ASYMMETRIC AND SYMMETRICAL SHEARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDROMAGNETICS; SUN, CORONA ID ELECTRIC-CURRENT SHEETS; MAGNETIC-FIELD AB A major issue in coronal-heating research is whether or not current sheets can occur without a null point being present in the initial potential magnetic field. Several analytic studies contend that current sheets form along separatrices between magnetic flux systems whenever the footpoints of the configuration are moved continuously. Both symmetric and asymmetric systems have been investigated, all with the assumption that the magnetic field is line tied at the discontinuous photospheric boundary. On the Sun, however, the interface between the photosphere and chromosphere has finite width, and hence line tying might not be appropriate there. The present work extends our earlier theoretical and numerical studies of the antisymmetric case to systems with asymmetric and symmetric shears. Using a 2.5 dimensional numerical code, we have investigated the results of an asymmetric shear imposed on a potential, quadrupolar magnetic field under two sets of atmospheric and boundary conditions: (1) a low-beta plasma with line tying at the base, similar to the line-tied analytic model; and (2) a hydrostatic-equilibrium atmosphere with solar gravity, typical of the observed photosphere-chromosphere interface. The low-beta simulation confirms the crucial role of the line-tying assumption in producing current sheets. We also examine the effects of a symmetric shear on the same hydrostatic-equilibrium atmosphere, using more grid points to improve the resolution of the current structures which form along the flux surfaces. Again we find that true current sheets do not form in the corona when a more realistic atmospheric model is considered. The amount of Ohmic dissipation in the thick currents is estimated to be two to four orders of magnitude below that required to heat the corona. We conclude, therefore, that magnetic topologies of the type examined here do not contribute significantly to coronal heating. RP KARPEN, JT (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4170,WASHINGTON,DC 20375, USA. RI Karpen, Judith/E-1484-2012; Antiochos, Spiro/D-4668-2012; DeVore, C/A-6067-2015 OI Antiochos, Spiro/0000-0003-0176-4312; DeVore, C/0000-0002-4668-591X NR 14 TC 33 Z9 33 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1991 VL 382 IS 1 BP 327 EP 337 DI 10.1086/170720 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GP641 UT WOS:A1991GP64100034 ER PT J AU SPADARO, D ANTIOCHOS, SK MARISKA, JT AF SPADARO, D ANTIOCHOS, SK MARISKA, JT TI NONEQUILIBRIUM IONIZATION EFFECTS IN ASYMMETRICALLY HEATED LOOPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIATIVE TRANSFER; SUN, CORONA; SUN, TRANSITION REGION ID SOLAR TRANSITION REGION; EMISSION-LINES; CORONAL LOOPS; FLOWS; CHROMOSPHERE; TEMPERATURE; REDSHIFTS AB We have investigated the effects of nonequilibrium ionization on magnetic loop models with a steady siphon flow that is driven by a nonuniform heating rate. In particular, we have considered the model developed by Mariska to explain the observed redshifts of transition region emission lines, and we have computed the number densities of the ions of carbon and oxygen along the loop, with and without the approximation of ionization equilibrium. Considerable deviations from equilibrium have been found. In order to determine the consequences of these nonequilibrium effects on the characteristics of the EUV emission from the loop plasma, we calculated the profiles and wavelength positions of all the important emission lines due to carbon and oxygen. Our calculations are in broad agreement with the conclusions reached by Mariska, although they show a significant diminution of the Doppler shifts, as well as modifications to the line widths. We conclude that the inclusion of nonequilibrium effects makes it more difficult to reproduce the observed characteristics of the solar transition region by means of the asymmetric-heating models. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP SPADARO, D (reprint author), UNIV CATANIA,OSSERVATORIO ASTROFIS CATANIA,VLE A DORIA 6,I-95125 CATANIA,ITALY. RI Antiochos, Spiro/D-4668-2012 OI Antiochos, Spiro/0000-0003-0176-4312 NR 26 TC 28 Z9 28 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1991 VL 382 IS 1 BP 338 EP 343 DI 10.1086/170721 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GP641 UT WOS:A1991GP64100035 ER PT J AU KEENAN, FP DUFTON, PL HARRA, LK CONLON, ES BERRINGTON, KA KINGSTON, AE WIDING, KG AF KEENAN, FP DUFTON, PL HARRA, LK CONLON, ES BERRINGTON, KA KINGSTON, AE WIDING, KG TI IMPROVED LINE RATIO CALCULATIONS INVOLVING DELTA-N = 1 (2-3) TRANSITIONS IN O-V AND A REANALYSIS OF SKYLAB OBSERVATIONS OF SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN, FLARES; SUN, SPECTRA; ULTRAVIOLET, SPECTRA ID ELECTRON COLLISIONAL EXCITATION; BE-LIKE IONS; C-III; INTENSITY RATIOS; IMPACT-EXCITATION; RATE COEFFICIENTS; F-VI; SUN; STRENGTHS; SPECTRUM AB New R-matrix calculations of electron impact excitation rates in O v are used to rederive theoretical electron density diagnostic emission-line ratios involving transitions between the n = 2 and 3 levels, which includes lines at 192.80, 192.90, 215.10, 215.25, 220.35, and 248.46 angstrom. A comparison of these diagnostics with observational data for two solar flares obtained with the Naval Research Laboratory's S-082A spectrograph on board Skylab reveals better agreement between theory and observation than was found previously. This provides experimental support for the improved accuracy of the atomic data employed in the present analysis. C1 QUEENS UNIV BELFAST,DEPT APPL MATH & THEORET PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4174W,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 32 TC 6 Z9 6 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1991 VL 382 IS 1 BP 349 EP 352 DI 10.1086/170723 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GP641 UT WOS:A1991GP64100037 ER PT J AU MORIARTY, RM HIRATAKE, J LIU, KM WENDLER, A AWASTHI, AK GILARDI, R AF MORIARTY, RM HIRATAKE, J LIU, KM WENDLER, A AWASTHI, AK GILARDI, R TI ISOLATION AND CHARACTERIZATION OF STEREOISOMERS OF PENTACOORDINATED PHOSPHORUS - HYDROLYSIS OF UNSYMMETRICALLY SUBSTITUTED CHIRAL MONOCYCLIC OXYPHOSPHORANES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note C1 STEROIDS LTD,CHICAGO,IL 60612. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP MORIARTY, RM (reprint author), UNIV ILLINOIS,DEPT CHEM,POB 4348,CHICAGO,IL 60680, USA. NR 14 TC 14 Z9 14 U1 0 U2 1 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 NOV 20 PY 1991 VL 113 IS 24 BP 9374 EP 9376 DI 10.1021/ja00024a056 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA GQ931 UT WOS:A1991GQ93100056 ER PT J AU BROUGHTON, J AF BROUGHTON, J TI CAN CLUSTERS BE SUPERHEATED SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACE; CRYSTAL; FILMS; TRANSITION; INTERFACE; ALUMINUM; DYNAMICS; LAYER; MELT; ICE AB We show that clusters coated with higher-melting-point material can be superheated above their thermodynamic melting point even when the effects of increased internal pressure are included. The work involves molecular-dynamics simulations of Lennard-Jones systems with coatings of differing strength of interaction. Reference is made to full thermodynamic analyses of the one- and two-component phase diagrams. Mechanisms responsible for this enhanced stability are determined. RP BROUGHTON, J (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 31 TC 21 Z9 21 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 18 PY 1991 VL 67 IS 21 BP 2990 EP 2993 DI 10.1103/PhysRevLett.67.2990 PG 4 WC Physics, Multidisciplinary SC Physics GA GQ408 UT WOS:A1991GQ40800018 ER PT J AU KARLE, JM KARLE, IL AF KARLE, JM KARLE, IL TI STRUCTURE OF THE ANTIMALARIAL (+/-)-MEFLOQUINE HYDROCHLORIDE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID MOLECULAR-STRUCTURE; QUINIDINE; CRYSTAL; RESISTANCE; QUININE; MALARIA AB (11R*,12S*)-(+/-)-alpha-2-Piperidinyl-2,8-bis-(trifluoromethyl)-4-quinolinemethanol monohydrochloride, C17H17F6N2O+.Cl-.0.5CH3OH, M(r) = 430.8, tetragonal, P4(2)/n (origin at center of symmetry), a = b = 24.595 (4), c = 6.398 (2) angstrom, V = 3870.0 angstrom 3, Z = 8, D(x) = 1.48 g cm-3, Cu K-alpha, lambda = 1.54178 angstrom, mu = 24.28 cm-1, F(000) = 1768, room temperature, final R = 7.5% for 2067 reflections with \F(o)\ > 3-sigma(F). Mefloquine hydrochloride crystallized as a secondary amine salt with channels of disordered methanol solvent. The trifluoromethyl group on the C adjacent to the quinoline N atom exhibited rotational disorder. Each chloride ion accepts three hydrogen bonds, one each from the hydroxyl group and the two H atoms of the amine group of mefloquine from three separate molecules. The angle between the average plane of the quinoline ring and the average plane of the piperidine ring is 110.5-degrees. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP KARLE, JM (reprint author), WALTER REED ARMY MED CTR,DIV EXPTL THERAPEUT,DEPT PHARMACOL,WASHINGTON,DC 20307, USA. NR 19 TC 19 Z9 19 U1 0 U2 5 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD NOV 15 PY 1991 VL 47 BP 2391 EP 2395 DI 10.1107/S0108270191005796 PN 11 PG 5 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA GR136 UT WOS:A1991GR13600042 ER PT J AU CARBONE, DP KOROS, AMC LINNOILA, RI JEWETT, P GAZDAR, AF AF CARBONE, DP KOROS, AMC LINNOILA, RI JEWETT, P GAZDAR, AF TI NEURAL CELL-ADHESION MOLECULE EXPRESSION AND MESSENGER-RNA SPLICING PATTERNS IN LUNG-CANCER CELL-LINES ARE CORRELATED WITH NEUROENDOCRINE PHENOTYPE AND GROWTH-MORPHOLOGY SO CANCER RESEARCH LA English DT Article ID MONOCLONAL-ANTIBODY HNK-1; NATURAL-KILLER CELLS; L-DOPA DECARBOXYLASE; N-CAM; ENDOCRINE DIFFERENTIATION; NCAM; ANTIGEN; IDENTIFICATION; INVITRO; BINDING AB Diverse histological types of lung cancer express neuroendocrine (NE) markers. We studied the expression and alternative splicing forms of the neural cell adhesion molecule (NCAM) NKH-1, a member of the immunoglobulin superfamily, in 56 lung cancer cell lines representing all histological types. We found a strong correlation between expression of NCAM with both NE phenotype and lack of substrate adhesion in culture. Several cell lines expressed high levels of the leukocyte antigen Leu-7 (HNK-1) but were negative for NCAM antigen and mRNA, indicating that the Leu-7 antigen is distinct from NCAM. All of the NCAM-positive cell lines demonstrate a single 6.2-kilobase mRNA, and analysis of the known 3' alternative splices shows predominant expression of only the membrane form with the small intracytoplasmic domain. We conclude that (a) expression of NCAM is associated with NE phenotype regardless of the histological type of lung cancer; (b) these cell lines share a single form of NCAM; (c) with few exceptions, NCAM expression is associated with cell to cell adhesion and lack of substrate adhesion (growing as floating clusters); and (d) Leu-7 antigen is distinct from NCAM. This form of NCAM may play a functional role in NE differentiation or may be a part of the NE program expressed by these cells. C1 UNIV PITTSBURGH,GRAD SCH PUBL HLTH,PITTSBURGH,PA 15261. USN,NCI,MED ONCOL BRANCH,BETHESDA,MD 20889. NR 47 TC 60 Z9 60 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 NOV 15 PY 1991 VL 51 IS 22 BP 6142 EP 6149 PG 8 WC Oncology SC Oncology GA GP271 UT WOS:A1991GP27100021 PM 1718595 ER PT J AU OSBORNE, RJ MERLO, GR MITSUDOMI, T VENESIO, T LISCIA, DS CAPPA, APM CHIBA, I TAKAHASHI, T NAU, MM CALLAHAN, R MINNA, JD AF OSBORNE, RJ MERLO, GR MITSUDOMI, T VENESIO, T LISCIA, DS CAPPA, APM CHIBA, I TAKAHASHI, T NAU, MM CALLAHAN, R MINNA, JD TI MUTATIONS IN THE P53 GENE IN PRIMARY HUMAN BREAST CANCERS SO CANCER RESEARCH LA English DT Note ID TUMOR SUPPRESSOR; POINT MUTATIONS; LUNG-CANCER; ALLELE LOSS; EXPRESSION; HETEROZYGOSITY; CHROMOSOME-17P; CARCINOMA; REGIONS AB Twenty-six primary breast tumors were examined for mutations in the p53 tumor suppressor gene by an RNase protection assay and nucleotide sequence analysis of PCR-amplified p53 complementary DNAs. Each method detected p53 mutations in the same three tumors (12%). One tumor contained two mutations in the same allele. Single strand conformation polymorphism analysis of genomic DNA and complementary DNA proved more sensitive in the detection of mutations. Combining this technique with the other two a total of 1 2 mutations in the p53 gene were demonstrated in 11 tumors (46%), and a polymorphism at codon 213 was detected in another tumor. Loss of heterozygosity on chromosome 17p was detected by Southern blot analysis in 30% of the tumor DNAs. Not all of the tumors containing a point mutation in p53 also had loss of heterozygosity of the remaining allele, suggesting that loss of heterozygosity may represent a later event. C1 USN,NCI,MED ONCOL BRANCH,BETHESDA,MD 20892. NCI,ONCOGENET SECT,BETHESDA,MD 20892. OSPED S GIOVANNI VECCHIO,TURIN,ITALY. RI Takahashi, Takashi/I-7262-2014; OI Mitsudomi, Tetsuya/0000-0001-9860-8505 NR 27 TC 179 Z9 180 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 NOV 15 PY 1991 VL 51 IS 22 BP 6194 EP 6198 PG 5 WC Oncology SC Oncology GA GP271 UT WOS:A1991GP27100030 PM 1682043 ER PT J AU OTTINGER, PF ROSE, DV MOSHER, D NERI, JM AF OTTINGER, PF ROSE, DV MOSHER, D NERI, JM TI Z-DISCHARGE TRANSPORT OF INTENSE ION-BEAMS FOR INERTIAL CONFINEMENT FUSION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PLASMA CHANNELS; PROPAGATION; DESIGN; DIODE AB Ion inertial confinement fusion requires beam transport over distances of a few meters for isolation of the diode hardware from the target explosion and for power compression by time-of-flight bunching. This paper evaluates light ion beam transport in a wall-stabilized z-discharge channel, where the discharge azimuthal magnetic field radially confines the ion beam. The ion beam is focused onto the entrance aperture of the transport channel by shaping the diode to achieve beam convergence in a field-free drift region separating the diode from the transport section. Ion orbits are studied to determine the injection efficiency (i.e., the fraction of the beam emitted from the diode which is transported) under various conditions. Ions that are focused onto the channel entrance at too large of an angle for confinement hit the wall and are lost. For a multimodular scheme (10-30 beams), individual transport channels are packed around the target with the exit apertures at some standoff distance from it. The fraction of the beam that is lost in this field-free standoff region is also evaluated under various conditions. The standoff efficiency is then combined with the injection efficiency to give the dependence of the total transport efficiency eta-t on diode, focusing, transport and standoff parameters. It is found that eta-t can be in the range of 75%-100% for parameter values that appear to be achievable. C1 JAYCOR,VIENNA,VA 22182. RP OTTINGER, PF (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 28 TC 15 Z9 15 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5292 EP 5305 DI 10.1063/1.350239 PN 1 PG 14 WC Physics, Applied SC Physics GA GQ943 UT WOS:A1991GQ94300017 ER PT J AU EHRLICH, AC GILLESPIE, DJ TRITT, TM KIM, C EDELSTEIN, AS QADRI, SB AF EHRLICH, AC GILLESPIE, DJ TRITT, TM KIM, C EDELSTEIN, AS QADRI, SB TI TEMPERATURE-DEPENDENT MAGNETORESISTANCE OF FE-NI MULTILAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB Temperature-dependent longitudinal and transverse magnetoresistance measurements have been carried out on a series of five Fe-Ni multilayer thin films. The samples were prepared by sputtering onto glass substrates that were nominally at room temperature and proved to be highly textured with the (111) direction perpendicular to the substrate. The multilayer wavelength ranged from 21 to 155 angstrom with each sublayer composed of an equal number of monolayers of Fe and Ni. For the larger-wavelength films the magnetoresistance data shows a preferred direction of in-plane magnetization associated with the film growth parameters. With the field perpendicular to the plane the data shows the characteristic break at the applied magnetic field required for saturation. This saturation field is not temperature dependent and does not vary much or in any systematic manner with wavelength. Above the saturation field the magnetoresistance varies linearly with applied field with a slope, dR/dH, that varies systematically with temperature but very little with wavelength. For the smaller-wavelength samples where both the Fe and Ni are in the fcc crystal structure there is evidence in both the magnetization and dR/dH for a more complicated magnetic structure than either the long-wavelength films or bulk materials. In particular there is evidence for atomic scale magnetic anisotropy that differs from the film average. RP EHRLICH, AC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 2 Z9 2 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5819 EP 5821 DI 10.1063/1.350121 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500030 ER PT J AU OLIVER, SA HARRIS, VG VITTORIA, C ELAM, WT KIM, KH HAMDEH, HH ALHABASH, M AF OLIVER, SA HARRIS, VG VITTORIA, C ELAM, WT KIM, KH HAMDEH, HH ALHABASH, M TI MAGNETIC-PROPERTIES AND LOCAL ORDERING DURING THERMAL ANNEALING OF AMORPHOUS FE75NI5B15SI5 FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID MOSSBAUER-SPECTRA; ALLOYS AB The evolution of magnetic properties and local atomic ordering during thermal annealing has been studied for amorphous Fe75Ni5B15Si5 thin films. Resistivity, vibrating sample magnetometer (VSM), ferromagnetic resonance (FMR), extended x-ray absorption fine structure (EXAFS), and Mossbauer effect (ME) measurements were taken on samples annealed at various temperatures ranging to film crystallization. The as-deposited samples are in a close-packed structure with little short-range order. Samples annealed above 200-degrees-C show ordering of the boron shell, but no indication of long-range ordering. With the exception of the anisotropy and coercive fields, no change in the magnetic or microwave magnetic parameters is observed for these samples prior to crystallization. Samples annealed above 400-degrees-C show indications of crystallization for all measurements. C1 NORTHEASTERN UNIV,DEPT ELECT & COMP ENGN,BOSTON,MA 02115. USN,RES LAB,WASHINGTON,DC 20375. WICHITA STATE UNIV,DEPT PHYS,WICHITA,KS 67208. RP OLIVER, SA (reprint author), NORTHEASTERN UNIV,CTR ELECTROMAGNET RES,BOSTON,MA 02115, USA. NR 10 TC 2 Z9 2 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5852 EP 5854 DI 10.1063/1.350134 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500043 ER PT J AU CHAIKEN, A LUBITZ, P KREBS, JJ PRINZ, GA HARFORD, MZ AF CHAIKEN, A LUBITZ, P KREBS, JJ PRINZ, GA HARFORD, MZ TI SPIN-VALVE MAGNETORESISTANCE OF UNCOUPLED FE-CU-CO SANDWICHES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID LAYERED MAGNETIC-STRUCTURES; SUPERLATTICES AB The coercive field of thin Co films is strongly dependent on substrate temperature and film thickness, but the magnetic properties of Fe films are only weakly affected by growth conditions. Fe-Cu-Co sandwiches deposited on glass and silicon substrates via electron-beam evaporation exhibit plateaus in their magnetization curves when the coercive field of the Co is made larger than that of the Fe. These plateaus correspond to an applied field region in which the Co and Fe moments are antialigned and the resistance is enhanced. The isotropic or spin-valve part of the magnetoresistance is as large as 3.3% in some sandwiches. The spin-valve magnetoresistance has a broad peak centered at a ferromagnetic layer thickness of 60 angstrom. RP CHAIKEN, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 11 Z9 11 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 NOV 15 PY 1991 VL 70 IS 10 BP 5864 EP 5866 DI 10.1063/1.350138 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500047 ER PT J AU CULLEN, JR HATHAWAY, KB AF CULLEN, JR HATHAWAY, KB TI A PHENOMENOLOGICAL THEORY FOR THE TEMPERATURE-DEPENDENCE OF THE ANTIFERROMAGNETIC COUPLING IN THIN-FILM SANDWICHES AND MULTILAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC RP CULLEN, JR (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 2 TC 7 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 NOV 15 PY 1991 VL 70 IS 10 BP 5879 EP 5879 DI 10.1063/1.350117 PN 2 PG 1 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500054 ER PT J AU LIOU, SH MALHOTRA, S SHAN, ZS SELLMYER, DJ NAFIS, S WOOLLAM, JA REED, CP DEANGELIS, RJ CHOW, GM AF LIOU, SH MALHOTRA, S SHAN, ZS SELLMYER, DJ NAFIS, S WOOLLAM, JA REED, CP DEANGELIS, RJ CHOW, GM TI THE PROCESS-CONTROLLED MAGNETIC-PROPERTIES OF NANOSTRUCTURED CO/AG COMPOSITE FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB Nanostructured Co/Ag composite films were prepared by magnetron sputtering using a single target. The average crystallite sizes of Co and Ag in the films depend on the deposition conditions. As the substrate temperature increases from 100-degrees-C to 600-degrees-C, the average Ag crystallite size increases from 39 to 452 angstrom, and the average Co crystallite size increases from < 30 to 297 angstrom in the film with 39 vol. % of Co. The films with 39 vol. % of Co and prepared at 400-degrees-C substrate temperature showed a maximum magnetic coercivity of 565 Oe at 6 K. We have studied the correlation between the structure and magnetic properties of these films. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. UNIV NEBRASKA,DEPT PHYS & ASTRON,LINCOLN,NE 68588. UNIV NEBRASKA,DEPT ELECT ENGN,LINCOLN,NE 68588. UNIV NEBRASKA,CTR MICROELECTR & MAT RES,LINCOLN,NE 68588. UNIV NEBRASKA,DEPT MECH ENGN,LINCOLN,NE 68588. GEOCENTERS INC,FT WASHINGTON,MD. RP LIOU, SH (reprint author), UNIV NEBRASKA,CTR MAT RES & ANAL,LINCOLN,NE 68588, USA. NR 10 TC 42 Z9 42 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5882 EP 5884 DI 10.1063/1.350094 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500057 ER PT J AU TJENG, LH IDZERDA, YU RUDOLF, P SETTE, F CHEN, CT AF TJENG, LH IDZERDA, YU RUDOLF, P SETTE, F CHEN, CT TI MAGNETIC-PROPERTIES OF ULTRATHIN FILMS OF NI/CU(001) PROBED BY SOFT-X-RAY MAGNETIC CIRCULAR-DICHROISM SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC C1 USN,RES LAB,WASHINGTON,DC 20375. RP TJENG, LH (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Rudolf, Petra/E-6434-2014 OI Rudolf, Petra/0000-0002-4418-1769 NR 2 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 5939 EP 5939 DI 10.1063/1.350112 PN 2 PG 1 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500075 ER PT J AU AYLESWORTH, KD HARFORD, MZ LUBITZ, P KOON, NC AF AYLESWORTH, KD HARFORD, MZ LUBITZ, P KOON, NC TI MAGNETIC-PROPERTIES OF FERRIMAGNETIC EXCHANGE-COUPLED RARE EARTH-IRON MULTILAYERED FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB We report the results of magnetic and structural studies of sputtered and evaporated multilayers of Gd0.15Fe0.85 and Gd0.40Fe0.60 alloys. Using these alloy compositions, the net moment in each layer is antiferromagnetically aligned with the adjacent layers. The magnetic measurements were made at 300 K in a SQUID magnetometer with a maximum field of 55 kOe. The structures of the films were studied by large-angle x-ray diffraction and the compositions were checked with energy-dispersive x-ray fluorescence and Auger depth profiling. To first order, the magnetic behavior of these films can be described by a semiclassical model that treats the magnetization of each layer as uniform with an antiferromagnetic coupling to the adjacent layers. The necessity of using different parameters to fit the in-plane and perpendicular data indicates the existence of an anisotropy that is not included in this simple model. Spin-flop transitions, similar to those reported for multilayers of pure Gd and Fe are observed and are attributed to the antiferromagnetic exchange coupling at the interfaces. These films also display novel magnetic behavior that can be explained by enhancement of magnetostatic effects. RP AYLESWORTH, KD (reprint author), USN,RES LAB,CODE 6340,WASHINGTON,DC 20375, USA. NR 2 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6197 EP 6199 DI 10.1063/1.349993 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500161 ER PT J AU HARRIS, VG AYLESWORTH, KD KIM, KH ELAM, WT KOON, NC AF HARRIS, VG AYLESWORTH, KD KIM, KH ELAM, WT KOON, NC TI EXTENDED X-RAY ABSORPTION FINE-STRUCTURE STUDIES OF IBS FE-TB ALLOY-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB We have employed extended x-ray absorption fine structure (EXAFS) analysis to study the compositional dependence of the atomic structure in Fe-Tb alloy films. Fourier transforms of EXAFS data, relative to both the Fe K and the Tb L(III) absorption edges, provide information about the local atomic environments relative to each atom. Results indicate the Fe EXAFS data to be dominated by Fe-Fe correlations, and consists of contributions from two Fe atomic shells at radial distances near 2.47 and 2.66 angstrom and a Tb shell near 2.91 angstrom. The coordination number of the Fe shells are measured to increase, while radial distances decrease, with increased Fe content. The Tb EXAFS data was found to have an atomic shells of Fe and Tb at 2.91 and 3.47 angstrom, respectively. Analysis suggests that the Fe shell is very disordered and is comprised of approximately 9.5 atoms while the Tb shell has almost-equal-to 3 atoms. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 6 Z9 6 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 NOV 15 PY 1991 VL 70 IS 10 BP 6311 EP 6314 DI 10.1063/1.349978 PN 2 PG 4 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500201 ER PT J AU KREBS, JJ RUBINSTEIN, M LUBITZ, P HARFORD, MZ BARAL, S SHASHIDHAR, R HO, YS CHOW, GM QADRI, S AF KREBS, JJ RUBINSTEIN, M LUBITZ, P HARFORD, MZ BARAL, S SHASHIDHAR, R HO, YS CHOW, GM QADRI, S TI MAGNETIC-PROPERTIES OF PERMALLOY-COATED ORGANIC TUBULES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID MICROSTRUCTURES AB We present an initial investigation of the ferromagnetic properties of a novel type of magnetic composite, viz., permalloy-coated submicron diameter hollow cylinders or tubules. The tubules form spontaneously from an organic material, a diacetylenic phosopholipid, and were used as templates on which the ferromagnetic material was deposited by electroless deposition. The permalloy-coated tubules were dispersed in an epoxy matrix to measure the magnetization and ferromagnetic resonance (FMR) properties of individual tubules. The nature of the magnetic anistropy and the FMR spectra observed confirmed that the tubules are well aligned by a magnetic field during the epoxy curing. The FMR spectra are interpreted in terms of a powder pattern distribution of thin-film spectra consistent with the large diameter-to-thickness ratio. RP KREBS, JJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 25 Z9 26 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 NOV 15 PY 1991 VL 70 IS 10 BP 6404 EP 6406 DI 10.1063/1.349936 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500232 ER PT J AU JONKER, BT CHOU, WC PETROU, A WARNOCK, J PRINZ, GA AF JONKER, BT CHOU, WC PETROU, A WARNOCK, J PRINZ, GA TI SPIN-POLARIZED CARRIER POPULATIONS IN DILUTED MAGNETIC SEMICONDUCTOR QUANTUM-WELL STRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC C1 SUNY BUFFALO,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6413 EP 6413 DI 10.1063/1.349912 PN 2 PG 1 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500235 ER PT J AU LUBITZ, P AYERS, JD DAVIS, A AF LUBITZ, P AYERS, JD DAVIS, A TI MAGNETIC-PROPERTIES OF PERMALLOY WIRES IN VYCOR CAPILLARIES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID AMORPHOUS WIRES AB Thin wires of NiFe alloys with compositions near 80% Ni were prepared by melting the alloy in vycor tubes and drawing fibers from the softened glass. The resulting fibers consist of relatively thick-walled vycor capillaries containing permalloy wires filling a few percent of the volume. The wires are continuous over considerable lengths, uniform in circular cross section, nearly free of contact with the walls and can be drawn to have diameters less than 1-mu-m. Their magnetic properties are generally similar to bulk permalloy, but show a variety of magnetic switching behaviors for fields along the wire axis, depending on composition, wire diameter, and thermal history. As pulled, the wires can show sharp switching, reversible rotation or mixed behavior. This method can produce NiFe alloy wires suitable for use in applications as sensor, memory or inductive elements; other alloys, such as supermalloy and sendust, also can be fabricated as fine wires by this method. RP LUBITZ, P (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1991 VL 70 IS 10 BP 6436 EP 6438 DI 10.1063/1.349921 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500244 ER PT J AU WUNFOGLE, M RESTORFF, JB CLARK, AE SAVAGE, HT AF WUNFOGLE, M RESTORFF, JB CLARK, AE SAVAGE, HT TI SUPPRESSION OF LARGE BARKHAUSEN JUMPS IN ANNEALED AMORPHOUS WIRES WITH AN IMPOSED TWIST AS A FUNCTION OF CURRENT, EXTERNAL AXIAL STRESS, AND AXIAL FIELD SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID MAGNETIZATION AB The magnetization and small signal alternating-current permeabilities of transverse-field-annealed amorphous magnetostrictive wires (Fe77.5B15Si7.5) with a fixed twist of 400 deg/m were examined as a function of applied axial tensile stress and axial direct-current (dc) currents. We observe multiple-featured magnetization curves which we attribute to the inverse Wiedemann effect, as well as a near total suppression of the large Barkhausen jumps when a dc current is flowing through the wire. Several properties of the wire depend on stress and would be useful for sensor applications; figures of merit of 1700-2600 for torque sensors were obtained. C1 SALVADOR VELAYOS LAB,E-28230 MADRID,SPAIN. RP WUNFOGLE, M (reprint author), USN,CTR SURFACE WEAP,SILVER SPRING,MD 20903, USA. NR 9 TC 10 Z9 10 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 NOV 15 PY 1991 VL 70 IS 10 BP 6519 EP 6521 DI 10.1063/1.349893 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500273 ER PT J AU VELAZQUEZ, J VAZQUEZ, M HERNANDO, A SAVAGE, HT WUNFOGLE, M AF VELAZQUEZ, J VAZQUEZ, M HERNANDO, A SAVAGE, HT WUNFOGLE, M TI MAGNETOELASTIC ANISOTROPY IN AMORPHOUS WIRES DUE TO QUENCHING SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC AB Amorphous wires are prepared by the in-water quenching technique. This procedure gives rise to local magnetoelastic anisotropies arising from the coupling between frozen-in internal stresses and magnetostriction. Azimuthal and axial components of internal stresses have been experimentally confirmed by the asymmetry of the Matteucci effect at different applied torques for the Fe77.5Si7.5B15 amorphous wire. According to classical theory of elasticity, internal stresses produced by the thermal gradient inside the wire during the quenching have been calculated. The nonzero values of azimuthal and axial stresses have been derived in addition to the well accepted radial stresses. This explains the present experimental results. Remanence and its dependence on tensile and torsional stresses has been also calculated. C1 INST CIENCIA MAT,E-28006 MADRID,SPAIN. USN,CTR SURFACE WEAP,SILVER SPRING,MD 20903. RP VELAZQUEZ, J (reprint author), UNIV COMPLUTENSE MADRID,RENFE,SALVADOR VELAYOS LAB,INST MAGNET APL,APDO 155,E-28230 LAS ROZAS MADRID,SPAIN. RI Vazquez, Manuel/A-6370-2011; Velazquez Cano, Julian /K-8689-2014; Hernando, Antonio/E-2105-2015 OI Velazquez Cano, Julian /0000-0002-2762-0141; NR 7 TC 36 Z9 36 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 NOV 15 PY 1991 VL 70 IS 10 BP 6525 EP 6527 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500275 ER PT J AU IDO, H YAMAUCHI, H CHENG, SF SANKAR, SG WALLACE, WE AF IDO, H YAMAUCHI, H CHENG, SF SANKAR, SG WALLACE, WE TI MAGNETIC-PROPERTIES OF THE Y1-XGDXCO3B2 SYSTEM SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 5TH JOINT MAGNETISM AND MAGNETIC MATERIALS - INTERM CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AMER INST PHYS, IEEE, MAGNET SOC ID RCO4B COMPOUNDS; GD; ER AB Magnetic properties of Y1-xGdxCo3B2 with x = 0, 0.2, 0.4, 0.6, 0.8, and 1.0 have been studied in a wide temperature range from 4.2 to 1250 K. All compounds studied here have the CeCo3B2-type structure which is a derivative of the RCo5 type one. In this system, the Co atom is nonmagnetic down to 4.2 K and the Curie temperature decreases almost linearly with increasing composition x and is expected to vanish at around x = 0 (YCo3B2). For the sample with x = 0.2, a spin-glass freezing point has been found in addition to the usual ferromagnetic Curie temperature. Gd magnetic moments obtained from the saturation magnetizations at T = 4.2 K are generally smaller than those obtained from the Curie-Weiss constants in the high-temperature paramagnetic region, which suggests a slight polarization of the Co atoms antiparallel to the Gd moment in the ferromagnetic region. C1 TOHOKU UNIV,MAT RES INST,SENDAI,MIYAGI 980,JAPAN. USN,CTR SURFACE WEAP,SILVER SPRING,MD 20903. CARNEGIE MELLON UNIV,DEPT MEMS,PITTSBURGH,PA 15213. RP IDO, H (reprint author), TOHOKU GAKUIN UNIV,DEPT APPL PHYS,TAGAJO 985,JAPAN. NR 14 TC 11 Z9 11 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 NOV 15 PY 1991 VL 70 IS 10 BP 6540 EP 6542 DI 10.1063/1.349900 PN 2 PG 3 WC Physics, Applied SC Physics GA GQ945 UT WOS:A1991GQ94500280 ER PT J AU JESSUP, AT MELVILLE, WK KELLER, WC AF JESSUP, AT MELVILLE, WK KELLER, WC TI BREAKING WAVES AFFECTING MICROWAVE BACKSCATTER .1. DETECTION AND VERIFICATION SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SEA-SURFACE; OCEAN SURFACE; CROSS-SECTION; WATER-WAVES; WIND-SPEED; RADAR; SCATTERING; FLUX; DEPENDENCE; MODERATE AB This paper is the first of a two-part series concerning detection and characterization of wave breaking when using microwave techniques. The importance of wave breaking in both microwave remote sensing and air-sea interaction has led to this investigation utilizing a K(u) band continuous wave Doppler scatterometer. Simultaneous microwave, video, and environmental measurements were made during the SAXON-CLT experiment off Chesapeake Bay in the fall of 1988. The scatterometer was pointed upwind at an incidence angle of 45-degrees and had an illuminated area that was small compared with the wavelength of the dominant surface waves. This first paper presents the schemes developed to detect individual breaking waves and verification of the method using video recordings. The most successful scheme is based on thresholds in both the radar cross section and the Doppler bandwidth. Microwave events consisting of a sea spike in the radar cross section accompanied by a large bandwidth were found to be associated with the steep forward face of waves in the process of breaking. The location of the illuminated area with respect to the phase of the breaking wave and the stage of breaking were found to influence the detectability of individual breaking waves. Approximately 70% of the sea spikes associated with waves that produced whitecaps were identified by the most successful detection scheme. The second paper examines how the degree of wave breaking, as measured by the microwave technique developed in this paper, depends on wind and wave conditions. C1 USN,RES LAB,WASHINGTON,DC 20375. MIT,RM PARSONS LAB,CAMBRIDGE,MA 02139. RI Jessup, Andrew/E-5625-2017 NR 32 TC 57 Z9 59 U1 1 U2 5 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 NOV 15 PY 1991 VL 96 IS C11 BP 20547 EP 20559 DI 10.1029/91JC01993 PG 13 WC Oceanography SC Oceanography GA GQ693 UT WOS:A1991GQ69300012 ER PT J AU JESSUP, AT MELVILLE, WK KELLER, WC AF JESSUP, AT MELVILLE, WK KELLER, WC TI BREAKING WAVES AFFECTING MICROWAVE BACKSCATTER .2. DEPENDENCE ON WIND AND WAVE CONDITIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WHITECAP COVERAGE; WATER TEMPERATURE; SEA; SURFACE; SCATTERING; STRESS AB This paper is the second of a two-pan series on using microwave techniques for detection and characterization of wave breaking. The statistics of sea spikes detected using the method described in Pan 1 are investigated as functions of friction velocity u* and of a Reynolds number Re* based on u* and the dominant surface wavelength. For vertical (VV) and horizontal (HH) polarization, the frequency of sea spikes and their contribution to the mean radar cross section show a roughly cubic dependence on u*. The percentage of wave crests producing sea spikes, P(ss), is consistent with the Re* exponent of 1.5 reported by other investigators. At high friction velocities (u* between 40 and 50 cm s-1), sea spikes contribute between 10% and 15% to the mean radar cross section for VV polarization and between 15% and 25% for HH polarization. The data suggest that the average radar cross section of an individual sea spike does not depend on u*. Measurements of Doppler frequency and bandwidth are used to investigate the kinematics of the breaking process. C1 USN,RES LAB,WASHINGTON,DC 20375. MIT,RM PARSONS LAB,CAMBRIDGE,MA 02139. RI Jessup, Andrew/E-5625-2017 NR 25 TC 25 Z9 26 U1 1 U2 3 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 NOV 15 PY 1991 VL 96 IS C11 BP 20561 EP 20569 DI 10.1029/91JC01994 PG 9 WC Oceanography SC Oceanography GA GQ693 UT WOS:A1991GQ69300013 ER PT J AU MITRA, S DUTTA, I HANSEN, RC AF MITRA, S DUTTA, I HANSEN, RC TI THERMAL CYCLING STUDIES OF A CROSS-PLIED-P100 GRAPHITE FIBER-REINFORCED 6061-ALUMINUM COMPOSITE LAMINATE SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID DEFORMATION; STRESS AB Response to thermal cycling of a 0/90 cross-plied P100 Gr-6061 aluminium composite laminate was studied between a minimum temperature (T(min)) of 25-degrees-C and maximum temperatures (T(max)) of 100 and 540-degrees-C. Strain hysteresis was observed between the heating and cooling half-cycles and was attributed to anelastic strains induced by matrix residual stresses. A residual plastic strain was also observed after the first cycle, and was seen to disappear after subsequent cycles. Alteration of the thermal residual stress state of the matrix via heat treatments was found to change significantly the magnitude of the plastic strain. These results were compared with those of studies on unidirectionally reinforced P100 Gr-6061 aluminium composites, and the differences were explained on the basis of the residual stresses resident in the matrix. Optical and electron microscopy were also utilized to observe thermal damage, which occurred predominantly along improperly bonded fibre-matrix interfaces. RP MITRA, S (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI GRP,MONTEREY,CA 93943, USA. NR 31 TC 25 Z9 25 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD NOV 15 PY 1991 VL 26 IS 22 BP 6223 EP 6230 DI 10.1007/BF01113908 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA GR018 UT WOS:A1991GR01800037 ER PT J AU AFZAL, RS LAWANDY, NM AF AFZAL, RS LAWANDY, NM TI TRANSVERSE BEAM RESHAPING AND BEAM ENCODING BY 2-BEAM COUPLING IN RUBY SO OPTICS COMMUNICATIONS LA English DT Article ID 4-WAVE-MIXING MEASUREMENTS; ALEXANDRITE CRYSTALS; LASER; PHASE; SOLIDS AB We have observed ring structure formation on a dye laser beam (5850 angstrom) propagating through ruby. We also present, to our knowledge, the first observation of transverse beam encoding by two-beam coupling where spatial rings form on a probe beam copropagating with an argon laser beam in ruby. C1 BROWN UNIV,DIV ENGN,PROVIDENCE,RI 02912. BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. RP AFZAL, RS (reprint author), USN,RES LAB,CODE 6551,WASHINGTON,DC 20375, USA. NR 25 TC 2 Z9 2 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 NOV 15 PY 1991 VL 86 IS 3-4 BP 307 EP 310 DI 10.1016/0030-4018(91)90010-B PG 4 WC Optics SC Optics GA GT570 UT WOS:A1991GT57000010 ER PT J AU CHYLEK, P LIN, HB EVERSOLE, JD CAMPILLO, AJ AF CHYLEK, P LIN, HB EVERSOLE, JD CAMPILLO, AJ TI ABSORPTION EFFECTS ON MICRODROPLET RESONANT EMISSION STRUCTURE SO OPTICS LETTERS LA English DT Article ID MORPHOLOGY-DEPENDENT RESONANCES; PARTIAL-WAVE RESONANCES; DIELECTRIC MICROSPHERES; OPTICAL CAVITIES; LASER-EMISSION; DROPLETS; SCATTERING AB The effect of absorption on microdroplet resonance emission line intensities was studied in 15-mu-m-diameter Rhodamine 6G/ethanol solution droplets. Absorption was controlled by varying the concentration of the additive nigrosin. Spectrally integrated intensities of resonant features are found to be proportional to a droplet cavity mode efficiency Q(a)/(Q(a) + Q(o)) expressed in terms of cavity output coupling and absorption factors Q(o) and Q(a), respectively. These Q's are determined from linewidths calculated from Lorenz-Mie theory by using combinations of the real and complex indices of refraction. An experimental upper limit of Q for first-order modes was determined to be 10(8) from the data. C1 USN,RES LAB,WASHINGTON,DC 20375. SUNY ALBANY,ATMOSPHER SCI RES CTR,ALBANY,NY 12222. POTOMAC PHOTON INC,LANHAM,MD 20706. RP CHYLEK, P (reprint author), DALHOUSIE UNIV,DEPT PHYS & OCEANOG,HALIFAX B3H 3J5,NS,CANADA. NR 18 TC 73 Z9 74 U1 2 U2 12 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD NOV 15 PY 1991 VL 16 IS 22 BP 1723 EP 1725 DI 10.1364/OL.16.001723 PG 3 WC Optics SC Optics GA GP404 UT WOS:A1991GP40400003 PM 19784119 ER PT J AU MERMELSTEIN, MD BLODGETT, JA AF MERMELSTEIN, MD BLODGETT, JA TI 1X2 FIBEROPTIC HETERODYNE ARRAY FOR LASER DOPPLER VELOCIMETRY AND ANGULAR ORIENTATION MEASUREMENTS SO OPTICS LETTERS LA English DT Article ID COHERENT AB A 1 x 2 single-mode fiber-optic heterodyne array is presented that simultaneously measures the radial and angular Doppler velocities of a target. This heterodyne array also provides an amplitude-dependent error signal suitable for angular tracking. C1 UNIV RES FDN,GREENBELT,MD. RP MERMELSTEIN, MD (reprint author), USN,RES LAB,CODE 6530,WASHINGTON,DC 20375, USA. NR 4 TC 1 Z9 1 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 NOV 15 PY 1991 VL 16 IS 22 BP 1788 EP 1790 DI 10.1364/OL.16.001788 PG 3 WC Optics SC Optics GA GP404 UT WOS:A1991GP40400025 PM 19784141 ER PT J AU DEENEY, C NASH, T PRASAD, RR WARREN, L WHITNEY, KG THORNHILL, JW COULTER, MC AF DEENEY, C NASH, T PRASAD, RR WARREN, L WHITNEY, KG THORNHILL, JW COULTER, MC TI ROLE OF THE IMPLOSION KINETIC-ENERGY IN DETERMINING THE KILOVOLT X-RAY-EMISSION FROM ALUMINUM-WIRE-ARRAY IMPLOSIONS SO PHYSICAL REVIEW A LA English DT Article ID PLASMAS; TEMPERATURE; DENSITY AB Aluminium wire arrays have been imploded on the 6-TW, 4-MA Double-EAGLE generator. An initial diameter of 12.5 mm and mass loading of 164-mu-g/cm have been identified as the optimum parameters to maximize the aluminum kilovolt K-shell yield. The implosion ime of 90 ns and the initial radius of 0.625 cm correspond to an implosion kinetic energy of 19.2 +/- 3.6 keV/ion. Larger-diameter arrays have higher kinetic energies per ion but lower masses, and they produce lower kilovolt K-shell x-ray yields. Smaller-diameter arrays have kinetic energies per ion less than the minimum 12 keV required to ionize aluminum to its K shell; so these arrays produce lower K-shell yields. Time-resolved x-ray pinhole photography and time-resolved spectroscopy are utilized to determine the K-shell emitting plasmas' sizes, temperatures, and densities as functions of time during the pinched phase. It is found that both the percentage of the mass radiating K-shell x rays and the electron temperature increase during the first 20 ns of emission. For the optimum implosion parameters, it is found that only a small percentage of the mass is radiating in the K shell and, furthermore, that the conversion of kinetic energy to kilovolt emissions alone does not account for the measured x-ray yields. The data analysis suggests that the problem of maximizing aluminum K-shell emission breaks down into two parts. On the one hand, K-shell emission is enhanced when, during the implosion phase, sufficient kinetic energy is generated to drive the aluminum plasma into the K shell on thermalization. This is in agreement with pure-kinetic-energy calculations. On the other hand, there appears to be an additional anomalous heating mechanism that scales with mass and adds to the K-shell emission during the current confinement on axis. As a result, the optimum x-ray production occurs in these experiments by maximizing the mass on axis while both achieving enough kinetic energy per ion and imploding at peak current. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DEENEY, C (reprint author), PHYS INT CO,2700 MERCED ST,SAN LEANDRO,CA 94577, USA. NR 22 TC 56 Z9 56 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV 15 PY 1991 VL 44 IS 10 BP 6762 EP 6775 DI 10.1103/PhysRevA.44.6762 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GR738 UT WOS:A1991GR73800063 ER PT J AU KRALL, J JOYCE, G ESAREY, E AF KRALL, J JOYCE, G ESAREY, E TI VLASOV SIMULATIONS OF VERY-LARGE-AMPLITUDE-WAVE GENERATION IN THE PLASMA WAKE-FIELD ACCELERATOR SO PHYSICAL REVIEW A LA English DT Article ID INTENSE LASER-PULSES; BREAKING; OSCILLATIONS; DYNAMICS AB Simulations of the plasma wake-field accelerator are carried out by following the time evolution of the plasma distribution function in one dimension via the Vlasov-Maxwell equations. Simulation results are compared to numerical solutions of the nonlinear relativistic cold plasma equations and to previous theoretical estimations of trapping and thermal effects on plasma waves. It is found that highly non-linear wakes are obtainable in the vicinity of the driving beam, where the thermal velocity spread of the plasma is reduced. In this region, wake amplitudes can significantly exceed the expectations of relativistic warm plasma models and agree closely with cold fluid theory. In all cases, however, particle trapping and thermalization due to particle scattering from the large-amplitude plasma wave reduce the wake to below the nonrelativistic wave-breaking limit after the initial accelerating peak. RP KRALL, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 28 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV 15 PY 1991 VL 44 IS 10 BP 6854 EP 6861 DI 10.1103/PhysRevA.44.6854 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GR738 UT WOS:A1991GR73800072 ER PT J AU MAKOUS, JL HUES, SM AF MAKOUS, JL HUES, SM TI STRUCTURE AND ELASTIC PROPERTIES OF AL-DOPED MO/NI SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID PHASE FORMATION; SUPER-LATTICES; NI/AL; ANOMALIES; CONSTANTS; BILAYERS; SYSTEM; WAVES; NI3AL AB Undoped Mo/Ni superlattices have previously been shown to exhibit a softening of the c44 shear elastic constant with decreasing bilayer thickness. Using ion-beam sputtering, we deposited a series of Mo/Ni superlattice films doped with Al at various concentrations up to 25 at. %. We used Auger electron spectroscopy, x-ray photoelectron spectroscopy, and x-ray diffraction to characterize the chemical and structural properties of the films. The elastic properties of the films were characterized using an improved surface-acoustic-wave (SAW) technique for measuring SAW velocities. We also demonstrate that linear perturbation theory can be used to determine information about the elastic properties of thin films from SAW measurements. We find that the effect of the Al doping on the structural, chemical, and elastic properties of Mo/Ni is small at Al concentrations up to approximately 15 at. %. From Auger bevel-map profiles we find that the Al is segregating to the Ni layers. The ability of the Mo/Ni system to tolerate this high concentration of Al is postulated to result from the formation of Ni3Al, whose structural constants closely match those of Ni. At higher Al concentrations a breakdown of the superlattice structure is accompanied by a rehardening of the c44 stiffness constant. RP MAKOUS, JL (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375, USA. NR 34 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1991 VL 44 IS 19 BP 10848 EP 10856 DI 10.1103/PhysRevB.44.10848 PG 9 WC Physics, Condensed Matter SC Physics GA GP689 UT WOS:A1991GP68900048 ER PT J AU CUI, LJ VENKATESWARAN, UD WEINSTEIN, BA JONKER, BT AF CUI, LJ VENKATESWARAN, UD WEINSTEIN, BA JONKER, BT TI MISMATCH-TUNING BY APPLIED PRESSURE IN ZNSE EPILAYERS - POSSIBILITY FOR MECHANICAL BUFFERING SO PHYSICAL REVIEW B LA English DT Note ID UNIAXIAL STRESS; GAAS; SPECTRUM; DEFECTS; GROWTH; MISFIT AB The effect of applied hydrostatic pressure on mismatch-generated strain in semiconductor epilayers is measured for ZnSe films on [001]-oriented GaAs and calculated for several common systems. We observe that pseudomorphic behavior persists in a 775-angstrom ZnSe epilayer until at least 60 kbar. In agreement with theory, the biaxial strain changes from compressive to tensile at 21 +/- 2 kbar, where exact lattice matching occurs. Our work suggests a "mechanical buffering" method for enhancing coherent growth of thick mismatched heterostructures. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CUI, LJ (reprint author), SUNY BUFFALO,DEPT PHYS,239 FRONCZAK HALL,BUFFALO,NY 14260, USA. NR 21 TC 20 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1991 VL 44 IS 19 BP 10949 EP 10952 DI 10.1103/PhysRevB.44.10949 PG 4 WC Physics, Condensed Matter SC Physics GA GP689 UT WOS:A1991GP68900069 ER PT J AU BERMUDEZ, VM KAPLAN, R AF BERMUDEZ, VM KAPLAN, R TI PREPARATION AND CHARACTERIZATION OF CARBON-TERMINATED BETA-SIC(001) SURFACES SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-ENERGY-LOSS; SILICON-CARBIDE SURFACES; AUGER LINE-SHAPES; C 1S EXCITATION; STIMULATED DESORPTION; LOSS SPECTROSCOPY; AMORPHOUS-CARBON; DIAMOND; FILMS; SI AB Carbon-terminated surfaces have been formed on the initially Si-terminated beta-SiC(001)-(2 X 1) surface by exposure to C2H4 at 800-degrees-C-1100-degrees-C. The structure of these surfaces (both as formed and after atomic-H adsorption) has been investigated using Auger and electron-energy-loss spectroscopies, low-energy electron diffraction, and electron-stimulated desorption of H+. A model is proposed for the c(2 X 2) ordered C monolayer consisting of sp3 single-bonded C-C units with each C bridging two nearest-neighbor Si atoms. These species exhibit a high degree of thermal stability, and the single dangling bond remaining on each C is an active site for the thermally reversible adsorption of atomic H. This c(2 X 2) surface is shown to be essentially the same as that formed by thermal desorption of Si from the (2 X 1) surface but is more uniform and well ordered. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 45 TC 57 Z9 57 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1991 VL 44 IS 20 BP 11149 EP 11158 DI 10.1103/PhysRevB.44.11149 PG 10 WC Physics, Condensed Matter SC Physics GA GR559 UT WOS:A1991GR55900017 ER PT J AU JOHNSTON, RF COOPER, JC AF JOHNSTON, RF COOPER, JC TI SUBSTITUENT EFFECTS ON THE FRONTIER MOLECULAR-ORBITALS OF ARYL ISONITRILES SO THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE LA English DT Article ID COMPLEXES; ISOCYANIDE; TUNGSTEN; DERIVATIVES; SERIES; NMR AB An investigation of the frontier molecular orbitals of o- and p-RC6H4NC (R = H, CH3,NO2,F, Cl, CF3, OCH3) was carried out so that a thorough understanding of the intricacies of sigma-donation and pi-acceptance could be developed and used to modify subtly the electron density on metal centers. The results of this study indicate that the substituent position (ortho vs. para) does alter the electron density in the ligand appreciably and that substitution of the phenyl ring with the groups indicated has a smaller effect on the sigma-donating ability than it does on the pi-accepting ability of the isonitrile ligand. The pi-accepting abilities of the isonitrile ligands increase in the order o-, p-CH3OC6H4NC, o-, p-CH3C6H4NC, o-, p-C6H5NC, o-, p-FC6H4NC, o-, p-CF3C6H4NC, o-, p-ClC6H4NC, o-, p-NO2C6H4NC while the sigma-donating ability decreases in this order. The energies of the sigma-donor and pi-acceptor orbitals are shown to correlate well with observed E1/2 values of Cr(RC6H4NC)6 and Mn (RC6H4NC)6(+1) complexes. This demonstrates how the theoretical results can be useful in understanding the observed physical properties of isonitrile-metal complexes. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP JOHNSTON, RF (reprint author), MEMPHIS STATE UNIV,DEPT CHEM,MEMPHIS,TN 38152, USA. NR 25 TC 0 Z9 0 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 THEOCHEM-J MOL STRUC JI Theochem-J. Mol. Struct. PD NOV 15 PY 1991 VL 82 IS 3-4 BP 297 EP 307 PG 11 WC Chemistry, Physical SC Chemistry GA GT778 UT WOS:A1991GT77800009 ER PT J AU BACH, SBH MCELVANY, SW AF BACH, SBH MCELVANY, SW TI DETERMINATION OF THE IONIZATION-POTENTIALS OF ALUMINUM-OXIDES VIA CHARGE-TRANSFER SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID COLLISION-INDUCED DISSOCIATION; CLUSTER IONS; OXYGEN AB The ionization potentials of aluminum oxides (AlxOy) with x = 2, y = 1-4; x = 3, y = 2-4; and x = 4, y = 4 were determined to within 0.2 eV by charge-transfer bracketing measurements in a Fourier transform ion cyclotron resonance (ICR) mass spectrometer (FTMS). The method of determining the ionization potentials (IPs) of molecules by charge-transfer bracketing is extended from species produced by direct laser vaporization to species formed by reactions within the ICR cell. The IPs of aluminum oxides containing two aluminum atoms (Al2Oy) increase from 8.35 to 8.9 eV for y = 1-3. Upon addition of a fourth oxygen the IP decreases by approximately 2 eV, indicating a possible structural change from linear to cyclic. Aluminum oxides containing three aluminum atoms (Al3Oy) have IPs of 6.85 eV for y = 2 and 3. A dramatic increase in IP of 1.5 eV is observed upon addition of a fourth oxygen atom. The changes in IP are related to the oxidation state of the aluminum in the oxide species. C1 USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375. RI Bach, Stephan/B-7496-2009 NR 21 TC 12 Z9 12 U1 0 U2 4 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 NOV 14 PY 1991 VL 95 IS 23 BP 9091 EP 9094 DI 10.1021/j100176a015 PG 4 WC Chemistry, Physical SC Chemistry GA GQ457 UT WOS:A1991GQ45700015 ER PT J AU HYAMS, KC BOURGEOIS, AL MERRELL, BR ROZMAJZL, P ESCAMILLA, J THORNTON, SA WASSERMAN, GM BURKE, A ECHEVERRIA, P GREEN, KY KAPIKIAN, AZ WOODY, JN AF HYAMS, KC BOURGEOIS, AL MERRELL, BR ROZMAJZL, P ESCAMILLA, J THORNTON, SA WASSERMAN, GM BURKE, A ECHEVERRIA, P GREEN, KY KAPIKIAN, AZ WOODY, JN TI DIARRHEAL DISEASE DURING OPERATION-DESERT-SHIELD SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Article ID TOXIGENIC ESCHERICHIA-COLI; TRAVELERS DIARRHEA; NORWALK VIRUS; SOUTH-KOREA; TRIMETHOPRIM; SHIGELLA; ANTIGEN; SULFAMETHOXAZOLE; GASTROENTERITIS; CHILDREN AB Background. Under combat conditions infectious disease can become a major threat to military forces. During Operation Desert Shield, there were numerous outbreaks of diarrhea among the U.S. forces. To evaluate the causes of and risk factors for diarrheal disease, we collected clinical and epidemiologic data from U.S. troops stationed in northeastern Saudi Arabia. Methods. Between September and December 1990, stool cultures for enteric pathogens were obtained from 432 military personnel who presented with diarrhea, cramps, vomiting, or hematochezia. In addition, a questionnaire was administered to 2022 soldiers in U.S. military units located in various regions of Saudi Arabia. Results. A bacterial enteric pathogen was identified in 49.5 percent of the troops with gastroenteritis. Enterotoxigenic Escherichia coli and Shigella sonnei were the most common bacterial pathogens. Of 125 E. coli infections, 39 percent were resistant to trimethoprim-sulfamethoxazole, 63 percent to tetracycline, and 48 percent to ampicillin. Of 113 shigella infections, 85 percent were resistant to trimethoprim-sulfamethoxazole, 68 percent to tetracycline, and 21 percent to ampicillin. All bacterial isolates were sensitive to norfloxacin and ciprofloxacin. After an average of two months in Saudi Arabia, 57 percent of the surveyed troops had at least one episode of diarrhea, and 20 percent reported that they were temporarily unable to carry out their duties because of diarrheal symptoms. Vomiting was infrequently reported as a primary symptom, but of 11 military personnel in whom vomiting was a major symptom, 9 (82 percent) had serologic evidence of infection with the Norwalk virus. Conclusions. Gastroenteritis caused by enterotoxigenic E coli and shigella resistant to a number of drugs was a major problem that frequently interfered with the duties of U.S. troops during Operation Desert Shield. C1 ARMED FORCES RES INST MED SCI,BANGKOK,THAILAND. NIH,INFECT DIS LAB,BETHESDA,MD 20892. USN,MED RES & DEV COMMAND,BETHESDA,MD 20814. USN,MED RES INST DETACHMENT,LIMA,PERU. USN,ENVIRONM & PREVENT MED UNIT 7,NAPLES,ITALY. USA,MED DEPT ACT,PREVENT MED SERV,FT CAMPBELL,KY. USN,MED RES UNIT 3,DIV EPIDEMIOL,CAIRO,EGYPT. WILLIAM BEAUMONT ARMY MED CTR,DEPT PEDIAT,EL PASO,TX 79920. RP HYAMS, KC (reprint author), USN,MED RES INST,DIV EPIDEMIOL,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. NR 47 TC 193 Z9 201 U1 0 U2 1 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD NOV 14 PY 1991 VL 325 IS 20 BP 1423 EP 1428 DI 10.1056/NEJM199111143252006 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA GP524 UT WOS:A1991GP52400006 PM 1656260 ER EF