FN Thomson Reuters Web of Science™ VR 1.0 PT B AU WILLIAMS, SM ELSINGABY, MI KHALIFA, FA AF WILLIAMS, SM ELSINGABY, MI KHALIFA, FA GP IEEE, CIIRCUITS & SYST SOC TI DAMPING OF GENERATOR OSCILLATIONS USING A STATE-FEEDBACK CONTROLLER SO PROCEEDINGS OF THE 36TH MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 36th Midwest symposium on Circuits and systems CY AUG 16-18, 1993 CL DETROIT, MI SP WAYNE STAT UNIV, IEEE, CIRCUITS & SYST SOC, UNIV WINDSOR C1 USN,SCH POSTGRAD,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1760-2 PY 1993 BP 60 EP 63 DI 10.1109/MWSCAS.1993.343108 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA BA79P UT WOS:A1993BA79P00016 ER PT B AU CRISTI, R ELSINGABY, MI AF CRISTI, R ELSINGABY, MI GP IEEE, CIIRCUITS & SYST SOC TI REGULATION OF THE GLUCOSE-CONCENTRATION FOR DIABETIC INDIVIDUALS SO PROCEEDINGS OF THE 36TH MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 36th Midwest symposium on Circuits and systems CY AUG 16-18, 1993 CL DETROIT, MI SP WAYNE STAT UNIV, IEEE, CIRCUITS & SYST SOC, UNIV WINDSOR C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1760-2 PY 1993 BP 442 EP 444 DI 10.1109/MWSCAS.1993.342993 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA BA79P UT WOS:A1993BA79P00110 ER PT B AU FARGUES, MP CRISTI, R VANDERKAMP, M AF FARGUES, MP CRISTI, R VANDERKAMP, M GP IEEE, CIIRCUITS & SYST SOC TI MODELING AND CLASSIFICATION OF BIOLOGICAL SIGNALS USING LEAST-SQUARES PRONY-SVD AR MODELING SO PROCEEDINGS OF THE 36TH MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 36th Midwest symposium on Circuits and systems CY AUG 16-18, 1993 CL DETROIT, MI SP WAYNE STAT UNIV, IEEE, CIRCUITS & SYST SOC, UNIV WINDSOR C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93940. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1760-2 PY 1993 BP 445 EP 448 DI 10.1109/MWSCAS.1993.342992 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA BA79P UT WOS:A1993BA79P00111 ER PT B AU BEY, PP YONCE, DJ NEWCOMB, RW AF BEY, PP YONCE, DJ NEWCOMB, RW GP IEEE, CIIRCUITS & SYST SOC TI INVESTIGATION OF CONTRAST ENHANCEMENT BY NUMERICAL-METHODS FOR AN OPTICAL CELLULAR NEURAL-NETWORK SO PROCEEDINGS OF THE 36TH MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 36th Midwest symposium on Circuits and systems CY AUG 16-18, 1993 CL DETROIT, MI SP WAYNE STAT UNIV, IEEE, CIRCUITS & SYST SOC, UNIV WINDSOR DE CELLULAR NEURAL NETWORK (CNN); SPATIAL FILTERING; LATERAL INHIBITION; EDGE ENHANCEMENT; IMAGE ENHANCEMENT; NEAREST-NEIGHBOR AND AUTONULLING DC BRIDGE (ADCB) C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1760-2 PY 1993 BP 582 EP 583 DI 10.1109/MWSCAS.1993.342979 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA BA79P UT WOS:A1993BA79P00146 ER PT B AU MOHAMED, DA AF MOHAMED, DA GP IEEE, CIIRCUITS & SYST SOC TI A MORE COMPREHENSIVE ANALYSIS OF MICROSTRIP GAP DISCONTINUITY IN THE SPECTRAL-DOMAIN SO PROCEEDINGS OF THE 36TH MIDWEST SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 36th Midwest symposium on Circuits and systems CY AUG 16-18, 1993 CL DETROIT, MI SP WAYNE STAT UNIV, IEEE, CIRCUITS & SYST SOC, UNIV WINDSOR C1 USN,DEPT ELECT & COMP ENGN,MONTEREY,CA 93940. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1760-2 PY 1993 BP 688 EP 689 DI 10.1109/MWSCAS.1993.342953 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA BA79P UT WOS:A1993BA79P00173 ER PT B AU HOOD, AG HILL, AG REEDER, GD POTTER, PS IVERSON, LIG KEATING, RF SPEIR, AM LEFRAK, EA AF HOOD, AG HILL, AG REEDER, GD POTTER, PS IVERSON, LIG KEATING, RF SPEIR, AM LEFRAK, EA BE Kurusz, M TI PERIOPERATIVE AUTOLOGOUS SEQUESTRATION .3. A NEW PHYSIOLOGICAL GLUE WITH WOUND-HEALING PROPERTIES SO PROCEEDINGS OF THE AMERICAN ACADEMY OF CARDIOVASCULAR PERFUSION, VOL 14 JAN, 1993 SE PROCEEDINGS OF THE AMERICAN ACADEMY OF CARDIOVASCULAR PERFUSION LA English DT Proceedings Paper CT 14th Annual Seminar on Cardiovascular Perfusion of the American-Academy-of-Cardiovascular-Perfusion CY JAN 22-25, 1993 CL SAN ANTONIO, TX SP AMER ACAD CARDIOVASC PERFUS C1 USN,REG MED CTR,OAKLAND,CA 94627. NR 0 TC 17 Z9 21 U1 0 U2 0 PU AMER ACAD CARDIOVASCULAR PERFUSION PI BIRMINGHAM PA PO BOX 100546, BIRMINGHAM, AL 35210 J9 P AM AC CAR PY 1993 VL 14 BP 126 EP 129 PG 4 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA BA32H UT WOS:A1993BA32H00023 ER PT J AU ALMINAUSKAS, V AF ALMINAUSKAS, V GP CALIF STATE UNIV, DEPT ELECT ENGN TI CHARGING LEAD ACID BATTERIES WITH UNREGULATED PHOTO VOLTAIC PANELS SO PROCEEDINGS OF THE EIGHTH ANNUAL BATTERY CONFERENCE ON APPLICATIONS AND ADVANCES LA English DT Proceedings Paper CT 8th Annual Battery Conference on Applications and Advances CY JAN 12-14, 1993 CL LONG BEACH, CA SP CALIF STATE UNIV, DEPT ELECT ENGN, CALIF INST TECHNOL, JET PROPULS LAB, ELECTROCHEM SOC INC, SO CALIF NEVADA SECT, AIAA, SAN GABRIEL VALLEY SECT, IEEE, ORANGE CTY SECT, INFOTECHNICS INC, CORDLESS POWER NEWS & POWER TECHNOL NEWS, SO CALIF EDISON CO, DEPT WATER & POWER, LOS ANGELES, LIEBERT CORP, INT BATTERY TECHNOL, BATTERY LINE C1 USN,DIV SURFACE WARFARE CTR CRANE,DEPT ELECTROCHEM POWER SOURCES,CRANE,IN 47522. 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 1993 BP 45 EP 50 PG 6 WC Electrochemistry; Energy & Fuels SC Electrochemistry; Energy & Fuels GA BC66F UT WOS:A1993BC66F00007 ER PT B AU RAMSEY, CL GREFENSTETTE, JJ AF RAMSEY, CL GREFENSTETTE, JJ BE Forrest, S TI CASE-BASED INITIALIZATION OF GENETIC ALGORITHMS SO PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON GENETIC ALGORITHMS LA English DT Proceedings Paper CT 5th International Conference on Genetic Algorithms CY JUL 17-21, 1993 CL UNIV ILLINOIS URBANA CHAMPAIGN, URBANA, IL HO UNIV ILLINOIS URBANA CHAMPAIGN C1 USN,RES LAB,CTR APPL RES AI,WASHINGTON,DC 20375. NR 0 TC 69 Z9 71 U1 0 U2 0 PU MORGAN KAUFMANN PUB INC PI SAN MATEO PA 2929 CAMPUS DRIVE, SAN MATEO, CA 94403 BN 1-558-60299-2 PY 1993 BP 84 EP 91 PG 8 WC Computer Science, Artificial Intelligence; Genetics & Heredity SC Computer Science; Genetics & Heredity GA BZ56M UT WOS:A1993BZ56M00012 ER PT B AU COBB, HG GREFENSTETTE, JJ AF COBB, HG GREFENSTETTE, JJ BE Forrest, S TI GENETIC ALGORITHMS FOR TRACKING CHANGING ENVIRONMENTS SO PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON GENETIC ALGORITHMS LA English DT Proceedings Paper CT 5th International Conference on Genetic Algorithms CY JUL 17-21, 1993 CL UNIV ILLINOIS URBANA CHAMPAIGN, URBANA, IL HO UNIV ILLINOIS URBANA CHAMPAIGN C1 USN,RES LAB,CTR APPL RES AI,WASHINGTON,DC 20375. NR 0 TC 105 Z9 110 U1 0 U2 1 PU MORGAN KAUFMANN PUB INC PI SAN MATEO PA 2929 CAMPUS DRIVE, SAN MATEO, CA 94403 BN 1-558-60299-2 PY 1993 BP 523 EP 530 PG 8 WC Computer Science, Artificial Intelligence; Genetics & Heredity SC Computer Science; Genetics & Heredity GA BZ56M UT WOS:A1993BZ56M00070 ER PT B AU SHING, MT PARKER, GB AF SHING, MT PARKER, GB BE Forrest, S TI GENETIC ALGORITHMS FOR THE DEVELOPMENT OF REAL-TIME MULTI-HEURISTIC SEARCH STRATEGIES SO PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON GENETIC ALGORITHMS LA English DT Proceedings Paper CT 5th International Conference on Genetic Algorithms CY JUL 17-21, 1993 CL UNIV ILLINOIS URBANA CHAMPAIGN, URBANA, IL HO UNIV ILLINOIS URBANA CHAMPAIGN C1 USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. NR 0 TC 6 Z9 6 U1 0 U2 0 PU MORGAN KAUFMANN PUB INC PI SAN MATEO PA 2929 CAMPUS DRIVE, SAN MATEO, CA 94403 BN 1-558-60299-2 PY 1993 BP 565 EP 572 PG 8 WC Computer Science, Artificial Intelligence; Genetics & Heredity SC Computer Science; Genetics & Heredity GA BZ56M UT WOS:A1993BZ56M00076 ER PT B AU TREJO, LJ SHENSA, MJ AF TREJO, LJ SHENSA, MJ GP SOC COMP SIMULAT INT TI LINEAR AND NEURAL-NETWORK MODELS FOR PREDICTING HUMAN SIGNAL-DETECTION PERFORMANCE FROM EVENT-RELATED POTENTIALS - A COMPARISON OF THE WAVELET TRANSFORM WITH OTHER FEATURE-EXTRACTION METHODS SO PROCEEDINGS OF THE FIFTH WORKSHOP ON NEURAL NETWORKS: ACADEMIC/INDUSTRIAL/NASA/DEFENSE: AN INTERNATIONAL CONFERENCE ON COMPUTATIONAL INTELLIGENCE: NEURAL NETWORKS, FUZZY SYSTEMS, EVOLUTIONARY PROGRAMMING AND VIRTUAL REALITY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 5th Workshop on Neural Networks and Fuzzy Logic: Emerging Technology Applications (WNN 93/FNN 93)/3rd Annual International Simulation Technology Conference (SimTec 93) CY NOV 07-10, 1993 CL SAN FRANCISCO, CA SP SOC COMP SIMULAT INT, NASA, SOC PHOTO OPT INSTRUMENTAT ENGINEERS, INT NEURAL NETWORKS SOC, IEEE, NEURAL NETWORKS COUNCIL C1 USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92152. NR 0 TC 3 Z9 3 U1 0 U2 0 PU SOC COMPUTER SIMULATION INT PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 BN 1-565-55059-5 J9 P SOC PHOTO-OPT INS PY 1993 VL 2204 BP 153 EP 161 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA BZ65E UT WOS:A1993BZ65E00023 ER PT B AU ROGERS, GW PRIEBE, CE HAYES, H SOLKA, JL AF ROGERS, GW PRIEBE, CE HAYES, H SOLKA, JL GP SOC COMP SIMULAT INT TI A PARALLEL DISTRIBUTED-PROCESSING ALGORITHM FOR POWER-LAW FEATURES WHICH REQUIRES ONLY NEAREST-NEIGHBOR COMMUNICATION SO PROCEEDINGS OF THE FIFTH WORKSHOP ON NEURAL NETWORKS: ACADEMIC/INDUSTRIAL/NASA/DEFENSE: AN INTERNATIONAL CONFERENCE ON COMPUTATIONAL INTELLIGENCE: NEURAL NETWORKS, FUZZY SYSTEMS, EVOLUTIONARY PROGRAMMING AND VIRTUAL REALITY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 5th Workshop on Neural Networks and Fuzzy Logic: Emerging Technology Applications (WNN 93/FNN 93)/3rd Annual International Simulation Technology Conference (SimTec 93) CY NOV 07-10, 1993 CL SAN FRANCISCO, CA SP SOC COMP SIMULAT INT, NASA, SOC PHOTO OPT INSTRUMENTAT ENGINEERS, INT NEURAL NETWORKS SOC, IEEE, NEURAL NETWORKS COUNCIL C1 USN,CTR SURFACE WARFARE,ADV COMPUTAT TECHNOL GRP,DAHLGREN,VA 22448. RI Priebe, Carey E./A-3305-2010 NR 0 TC 1 Z9 1 U1 0 U2 0 PU SOC COMPUTER SIMULATION INT PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 BN 1-565-55059-5 J9 P SOC PHOTO-OPT INS PY 1993 VL 2204 BP 269 EP 275 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA BZ65E UT WOS:A1993BZ65E00040 ER PT B AU FOX, AG TABBERNOR, MA AF FOX, AG TABBERNOR, MA BE Wayman, CM Perkins, J TI THE STRUCTURE FACTORS, CHARGE DENSITY AND DEBYE-WALLER FACTORS OF MARTENSITIC NI-RICH beta NIAL SO PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON MARTENSITIC TRANSFORMATIONS (ICOMAT-92) LA English DT Proceedings Paper CT International Conference on Martensitic Transformations (ICOMAT-92) CY JUL 20-24, 1992 CL MONTEREY, CA SP MONTEREY INST ADV STUDIES C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI SECT,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MONTEREY INST ADVANCED STUDIES PI CARMEL PA PO BOX 4427, CARMEL, CA 93921 PY 1993 BP 129 EP 134 PG 6 WC Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing; Physics, Condensed Matter SC Metallurgy & Metallurgical Engineering; Materials Science; Physics GA BD05K UT WOS:A1993BD05K00018 ER PT J AU CAMPANILE, J TANJU, B AF CAMPANILE, J TANJU, B GP INST NAVIGAT TI ASSESSMENT OF INTEGRATION OPTIONS FOR GPS EQUIPPED WEAPONS DURING HOST VEHICLE CAPTIVE CARRIAGE SO PROCEEDINGS OF THE NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION: EVOLUTION THROUGH INTEGRATION OF CURRENT AND EMERGING SYSTEMS LA English DT Proceedings Paper CT National Technical Meeting of the Institute-of-Navigation on Evolution Through Integration of Current and Emerging Systems CY JAN 20-22, 1993 CL SAN FRANCISCO, CA SP INST NAVIGAT C1 USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,WASHINGTON,DC 20350. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INST NAVIGATION PI WASHINGTON PA 815 15TH ST NW, STE 832, WASHINGTON, DC 20005 PY 1993 BP 47 EP 54 PG 8 WC Engineering, Aerospace; Transportation SC Engineering; Transportation GA BA73Z UT WOS:A1993BA73Z00005 ER PT J AU NELTHROPP, DA TANJU, B AF NELTHROPP, DA TANJU, B GP INST NAVIGAT TI TEST AND EVALUATION OF EMBEDDED GPS SYSTEMS SO PROCEEDINGS OF THE NATIONAL TECHNICAL MEETING OF THE INSTITUTE OF NAVIGATION: EVOLUTION THROUGH INTEGRATION OF CURRENT AND EMERGING SYSTEMS LA English DT Proceedings Paper CT National Technical Meeting of the Institute-of-Navigation on Evolution Through Integration of Current and Emerging Systems CY JAN 20-22, 1993 CL SAN FRANCISCO, CA SP INST NAVIGAT C1 USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,WASHINGTON,DC 20350. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INST NAVIGATION PI WASHINGTON PA 815 15TH ST NW, STE 832, WASHINGTON, DC 20005 PY 1993 BP 295 EP 303 PG 9 WC Engineering, Aerospace; Transportation SC Engineering; Transportation GA BA73Z UT WOS:A1993BA73Z00031 ER PT J AU MURDOCH, MA AF MURDOCH, MA GP ENVIRONMENT CANADA TI EVALUATING OIL-WATER SEPARATORS SO PROCEEDINGS OF THE SIXTEENTH ARCTIC AND MARINE OIL SPILL PROGRAM ( AMOP ) TECHNICAL SEMINAR, VOLS 1 AND 2 LA English DT Proceedings Paper CT 16th Arctic and Marine Oil Spill Program (AMOP) Technical Seminar CY JUN 07-09, 1993 CL CALGARY, CANADA SP ENVIRONM CANADA, ENVIRONM PROTECT CONSERVAT & PROTECT, TECHNOL DEV BRANCH C1 USN,CIVIL ENGN LAB,PORT HUENEME,CA 93023. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ENVIRONMENT CANADA PI OTTAWA PA OTTAWA ON K1A OH3, CANADA PY 1993 BP 435 EP 449 PG 15 WC Energy & Fuels; Environmental Sciences; Oceanography SC Energy & Fuels; Environmental Sciences & Ecology; Oceanography GA BZ56S UT WOS:A1993BZ56S00032 ER PT B AU GRISCOM, DL AF GRISCOM, DL BE Wright, AC TI ELECTRON-SPIN-RESONANCE STUDIES OF POINT-DEFECTS AND MAGNETIC PRECIPITATES IN SILICATE-GLASSES SO PROCEEDINGS OF THE SYMPOSIUM ON THE STRUCTURAL CHEMISTRY OF SILICATES SE TRANSACTIONS OF THE AMERICAN CRYSTALLOGRAPHIC ASSOCIATION LA English DT Proceedings Paper CT Symposium on the Structural Chemistry of Silicates CY JUL 22-24, 1991 CL UNIV TOLEDO, TOLEDO, OH SP AMER CRYSTALLOG ASSOC HO UNIV TOLEDO C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CRYSTALLOGRAPHIC ASSOC PI BUFFALO PA PO BOX 96, ELLICOTT STATION, BUFFALO, NY 14205-0096 BN 0-937140-36-8 J9 T AM CRYST PY 1993 VL 27 BP 143 EP 162 PG 20 WC Chemistry, Physical; Crystallography; Materials Science, Ceramics SC Chemistry; Crystallography; Materials Science GA BA02S UT WOS:A1993BA02S00014 ER PT B AU BARNHART, CM WIESELTHIER, JE EPHREMIDES, A AF BARNHART, CM WIESELTHIER, JE EPHREMIDES, A GP JOHNS HOPKINS UNIV TI USE OF THE STANDARD CLOCK TO IMPROVE SIMULATION EFFICIENCY - A QUANTITATIVE STUDY BASED ON THE M/M/1/K QUEUE SO PROCEEDINGS OF THE TWENTY-SEVENTH ANNUAL CONFERENCE ON INFORMATION SCIENCES AND SYSTEMS LA English DT Proceedings Paper CT 27th Annual Conference on Information Sciences and Systems CY MAR 24-26, 1993 CL JOHNS HOPKINS UNIV, BALTIMORE, MD SP JOHNS HOPKINS UNIV, DEPT ELECT & COMP ENGN HO JOHNS HOPKINS UNIV C1 USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV DEPT ELECTRICA & COMPUTER ENGINEERING PI BALTIMORE PA BALTIMORE, MD 21218 PY 1993 BP 112 EP 118 PG 7 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Optics SC Computer Science; Engineering; Optics GA BB64Q UT WOS:A1993BB64Q00023 ER PT J AU MODIANO, E WIESELTHIER, J EPHREMIDES, A AF MODIANO, E WIESELTHIER, J EPHREMIDES, A GP JOHNS HOPKINS UNIV TI AN APPROACH FOR THE ANALYSIS OF PACKET DELAY IN AN INTEGRATED MOBILE RADIO NETWORK SO PROCEEDINGS OF THE TWENTY-SEVENTH ANNUAL CONFERENCE ON INFORMATION SCIENCES AND SYSTEMS LA English DT Meeting Abstract CT 27th Annual Conference on Information Sciences and Systems CY MAR 24-26, 1993 CL JOHNS HOPKINS UNIV, BALTIMORE, MD SP JOHNS HOPKINS UNIV, DEPT ELECT & COMP ENGN HO JOHNS HOPKINS UNIV C1 USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375. NR 0 TC 1 Z9 1 U1 0 U2 0 PU JOHNS HOPKINS UNIV DEPT ELECTRICA & COMPUTER ENGINEERING PI BALTIMORE PA BALTIMORE, MD 21218 PY 1993 BP 138 EP 138 PG 1 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Optics SC Computer Science; Engineering; Optics GA BB64Q UT WOS:A1993BB64Q00027 ER PT B AU ABRAHAMS, J AF ABRAHAMS, J GP JOHNS HOPKINS UNIV TI PARALLELIZED HUFFMAN AND HU-TUCKER SEARCHING SO PROCEEDINGS OF THE TWENTY-SEVENTH ANNUAL CONFERENCE ON INFORMATION SCIENCES AND SYSTEMS LA English DT Proceedings Paper CT 27th Annual Conference on Information Sciences and Systems CY MAR 24-26, 1993 CL JOHNS HOPKINS UNIV, BALTIMORE, MD SP JOHNS HOPKINS UNIV, DEPT ELECT & COMP ENGN HO JOHNS HOPKINS UNIV C1 OFF NAVAL RES,DIV MATH SCI,ARLINGTON,VA 22217. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV DEPT ELECTRICA & COMPUTER ENGINEERING PI BALTIMORE PA BALTIMORE, MD 21218 PY 1993 BP 363 EP 368 PG 6 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Optics SC Computer Science; Engineering; Optics GA BB64Q UT WOS:A1993BB64Q00071 ER PT B AU FARGHER, JSW AF FARGHER, JSW BE Sumanth, DJ Edosomwan, JA Poupart, R Sink, DS TI PROCESS IMPROVEMENT VERSUS LAYOFFS SO PRODUCTIVITY & QUALITY MANAGEMENT FRONTIERS IV, VOLS 1 AND 2 LA English DT Proceedings Paper CT 4th International Conference on Productivity and Quality Research CY FEB 09-12, 1993 CL MIAMI, FL SP UNIV MIAMI, DEPT IND ENGN, PROD RES GRP, UNIV MIAMI, SCH CONTINUING STUDIES, OFF CONF & INST, INST IND ENGINEERS C1 USN,AVIAT DEPOT,CHERRY POINT,NC. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INDUSTRIAL ENGINEERING & MANAGEMENT PR PI NORCROSS PA 25 TECHNOLOGY PARK, NORCROSS, GA 30092 BN 0-89806-125-3 PY 1993 BP 147 EP 157 PG 11 WC Management SC Business & Economics GA BA39R UT WOS:A1993BA39R00025 ER PT J AU HANNICK, LI PRASHER, DC SCHULTZ, LW DESCHAMPS, JR WARD, KB AF HANNICK, LI PRASHER, DC SCHULTZ, LW DESCHAMPS, JR WARD, KB TI PREPARATION AND INITIAL CHARACTERIZATION OF CRYSTALS OF THE PHOTOPROTEIN AEQUORIN FROM AEQUOREA-VICTORIA SO PROTEINS-STRUCTURE FUNCTION AND GENETICS LA English DT Article DE AEQUORIN; PHOTOPROTEIN; CRYSTALLIZATION; BIOLUMINESCENCE; X-RAY DIFFRACTION; METAL-BINDING ID CALCIUM-BINDING PROTEIN; SEQUENCE AB Crystals of recombinant aequorin, the photoprotein from the jellyfish Aequorea victoria, have been grown from solutions containing sodium phosphate. The crystals grow as thin plates which diffract to beyond 2.2 angstrom resolution. The crystals are orthorhombic, space group P2(1)2(1)2(1); the axes are a = 89.1(1), b = 88.4(1), and c = 52.7(1) angstrom. The asymmetric unit contains two molecules. Crystals exposed to calcium ion solutions emit a steady glow and slowly deteriorate, confirming that the crystals consist of a charged, competent photoprotein. This represents the first successful preparation of single crystals of a photoprotein suitable for diffraction analysis. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. CORNELL UNIV,DEPT CHEM,ITHACA,NY 14853. RP HANNICK, LI (reprint author), USN,RES LAB,CODE 6030,WASHINGTON,DC 20375, USA. OI Deschamps, Jeffrey/0000-0001-5845-0010 NR 24 TC 12 Z9 12 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 0887-3585 J9 PROTEINS JI Proteins PD JAN PY 1993 VL 15 IS 1 BP 103 EP 107 DI 10.1002/prot.340150113 PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA KC061 UT WOS:A1993KC06100012 PM 8451237 ER PT J AU CONWAY, TL HURTADO, SL WOODRUFF, SI AF CONWAY, TL HURTADO, SL WOODRUFF, SI TI TOBACCO USE PREVENTION AND CESSATION PROGRAMS IN THE UNITED-STATES-NAVY SO PUBLIC HEALTH REPORTS LA English DT Article ID MILITARY PERSONNEL; SMOKING; ALCOHOL AB A representative sample of 406 U.S. Navy commands, including all medical treatment facilities, was surveyed in 1990 about their activities and programs to prevent the use of tobacco and promote smoking cessation during the preceding year. The vast majority of Navy commands (86 percent) provided some type of tobacco cessation educational materials or programs. However, the most common activities typically were rated as only ''somewhat useful'' in helping to curb tobacco use. Almost one-half of all commands offered psychological or behavioral cessation programs. Survey respondents estimated that approximately one-third of those persons who attended such a program stopped their tobacco use and nearly one-half reduced their tobacco use as a result of the program. Over-the-counter smoking cessation aids were not widely available at Navy exchange stores, individual commands, or medical treatment facilities. Furthermore, only 61 percent of all commands reported that they had a written policy or instruction regarding tobacco use. Only about one-third of medical treatment facilities had a routine system for identifying tobacco users by glancing at their medical records. However, it was estimated that 80 percent of medical treatment facility physicians routinely asked their patients about their tobacco use. The authors discuss the need for a more active Navy approach in prevention and cessation efforts and a routine system for identifying tobacco users from their medical records. In addition, inequities in cessation efforts were found among command subgroups. RP CONWAY, TL (reprint author), USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,POB 85122,SAN DIEGO,CA 92186, USA. NR 16 TC 7 Z9 7 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0033-3549 J9 PUBLIC HEALTH REP JI Public Health Rep. PD JAN-FEB PY 1993 VL 108 IS 1 BP 105 EP 115 PG 11 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA KL046 UT WOS:A1993KL04600016 PM 8434085 ER PT J AU BARKYOUMB, JH MANSOUR, AN CHAKRABARTI, K MATHUR, VK AF BARKYOUMB, JH MANSOUR, AN CHAKRABARTI, K MATHUR, VK TI EXAFS STUDY OF THE LOCAL ENVIRONMENT OF THE THULIUM ION IN CASO4TM DOSIMETRIC PHOSPHORS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON SOLID STATE DOSIMETRY CY JUL 13-17, 1992 CL WASHINGTON, DC SP NIH, US DOE, INT SENSOR TECHNOL, LANDAUER, NUCL TECHNOL PUBL, SCI APPL INT, SIEMENS GAMMASON, SOLON TECHNOL, VICTOREEN AB EXAFS (extended X ray absorption fine structure) spectroscopy has been used to study the local structural and chemical environment around the thulium dopant in CaSO4 dosimetric phosphor obtained both commercially and fabricated in this laboratory. In the EXAFS technique, a tunable monochromatic X ray source is used to excite selectively photoelectrons from an inner shell of the atomic species under investigation (in this case, the thulium L edges at 8648 eV). The coherent scattering of the outgoing photoelectron from the neighbouring atoms is then analysed as a function of X ray beam energy to yield information on the site of the central atom. These experiments were performed at the X-11A beamline at the National Synchrotron Light Source. By comparing the EXAFS from standards such as Tm2O3, it can be shown that a diffusion method used for phosphor preparation was not effective for substituting Tm3+ onto Ca2+ sites and an acid distillation method starting from CaSO4:2H2O was more successful. The phosphor samples where the Tm is shown to be well incorporated onto Ca2+ cation sites are also those with the better TL dosimetry characteristics. RP BARKYOUMB, JH (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1993 VL 47 IS 1-4 BP 59 EP 63 PG 5 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LN648 UT WOS:A1993LN64800012 ER PT J AU CHAKRABARTI, K SHARMA, J MATHUR, VK AF CHAKRABARTI, K SHARMA, J MATHUR, VK TI LASER BLEACHING OF DEEP TRAPS AND REDUCTION OF ZERO DOSE PROBLEM IN CAF2MN DOSIMETERS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON SOLID STATE DOSIMETRY CY JUL 13-17, 1992 CL WASHINGTON, DC SP NIH, US DOE, INT SENSOR TECHNOL, LANDAUER, NUCL TECHNOL PUBL, SCI APPL INT, SIEMENS GAMMASON, SOLON TECHNOL, VICTOREEN AB In order to determine the cause of 'background reading' in Mn2+ doped CaF2 dosemeters, its thermoluminescence from room temperature to 600-degrees-C, has been investigated. For this, radiation doses ranging from mGy to MGy have been used and the irradiations have been carried out at various temperatures between room and 500-degrees-C. Just beyond the dosimetry peak at 285-degrees-C another peak at 390-degrees-C has been observed which cannot be properly removed during a readout limited to 400-degrees-C. This peak feeds into the dosimetry peak thus regenerating it in course of time without further exposure to radiation, causing the so called 'zero dose' or 'background reading' problem. 337 nm light from a nitrogen laser readily depletes the trap responsible for the 390-degrees-C peak by phototransfer processes and removes this problem. A model is proposed to explain this phenomenon. RP CHAKRABARTI, K (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1993 VL 47 IS 1-4 BP 155 EP 158 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LN648 UT WOS:A1993LN64800032 ER PT J AU LOWRY, KA LEE, Y GORBICS, SG JOHNSON, TL AF LOWRY, KA LEE, Y GORBICS, SG JOHNSON, TL TI METHODS FOR THE RAPID DECONVOLUTION OF THERMOLUMINESCENCE GLOW CURVES SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON SOLID STATE DOSIMETRY CY JUL 13-17, 1992 CL WASHINGTON, DC SP NIH, US DOE, INT SENSOR TECHNOL, LANDAUER, NUCL TECHNOL PUBL, SCI APPL INT, SIEMENS GAMMASON, SOLON TECHNOL, VICTOREEN AB Methods for the rapid deconvolution of thermoluminescence glow curves are described. By tailoring a least squares fitting routine specifically for glow curve deconvolution, we have achieved an order of magnitude reduction in unfolding time. For routine applications, where many similar glow curves are analysed, another order of magnitude reduction is achieved by fitting the glow curves to a previously determined set of glow peaks, rather than deconvoluting each glow curve into a unique set of glow peaks. For this case, a glow curve consisting of 200 data points can be deconvoluted into 12 glow peaks in less than 0.2 s. RP LOWRY, KA (reprint author), USN,RES LAB,CODE 1240,WASHINGTON,DC 20375, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1993 VL 47 IS 1-4 BP 493 EP 496 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LN648 UT WOS:A1993LN64800103 ER PT J AU HARPER, MJ NELSON, ME AF HARPER, MJ NELSON, ME TI EXPERIMENTAL-VERIFICATION OF A SUPERHEATED LIQUID DROPLET (BUBBLE) NEUTRON DETECTOR THEORETICAL-MODEL SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON SOLID STATE DOSIMETRY CY JUL 13-17, 1992 CL WASHINGTON, DC SP NIH, US DOE, INT SENSOR TECHNOL, LANDAUER, NUCL TECHNOL PUBL, SCI APPL INT, SIEMENS GAMMASON, SOLON TECHNOL, VICTOREEN AB Superheated liquid droplet ('bubble') neutron detectors utilise thousands of microscopic droplets of freon-based compounds suspended in a viscous matrix material. Neutrons can interact with the atoms of the superheated liquid droplets, resulting in the formation of energetic charged recoil ions. These ions transfer their energy to the liquid in the droplets, sometimes resulting in the droplets vaporising and producing visible bubbles. The basis of bubble detector operation is identical to that of bubble chambers, which have been well characterised by researchers such as Wilson, Glaser, Seitz, and others since the 1950s. Each of the microscopic superheated liquid droplets behaves like an independent bubble chamber. This paper presents a theoretical model that considers the three principal aspects of detector operation: nuclear reactions, charged particle energy deposition, and thermodynamic bubble formation. All possible nuclear reactions were examined and those which could reasonably result in recoil ions sufficiently energetic to vaporise a droplet were analysed in detail. Feasible interactions having adequate cross sections include clastic and inelastic scattering, n-proton, and n-alpha reactions. Ziegler's transport of ions in matter (TRIM) code was used to calculate the ions' stopping powers in various compounds based on the ionic energies predicted by standard scattering distributions. If the ions deposit enough energy in a small enough volume then the bubble of vapour that forms will grow to 'critical' size, and spontaneously vaporise the rest of the entire droplet without further energy input. Various theories as to the vaporisation of droplets by ionising radiation were studied and a novel method of predicting the critical (minimum) energy was developed. This method can be used to calculate the minimum required stopping power for the ion, from which the threshold neutron energy is obtainable. Experimental verification of the model was accomplished by measuring the response of two different types of bubble detectors to monoenergetic thermal neutrons, as well as to neutrons from the polyenergetic spectra of bare and moderated californium spontaneous fission sources. The model's predicted response compared favourably with the experimental data. RP HARPER, MJ (reprint author), USN ACAD,DEPT NAOME,590 HOLLOWAY RD,ANNAPOLIS,MD 21402, USA. NR 0 TC 13 Z9 13 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1993 VL 47 IS 1-4 BP 535 EP 542 PG 8 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LN648 UT WOS:A1993LN64800112 ER PT J AU RIEL, G AF RIEL, G TI ROLE OF NEUTRON BUBBLE DOSIMETERS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON SOLID STATE DOSIMETRY CY JUL 13-17, 1992 CL WASHINGTON, DC SP NIH, US DOE, INT SENSOR TECHNOL, LANDAUER, NUCL TECHNOL PUBL, SCI APPL INT, SIEMENS GAMMASON, SOLON TECHNOL, VICTOREEN AB Bubble dosemeters may determine whether routine dosimetry is required, because they are a credible indicator of the presence or absence of neutrons even in strong gamma ray fields. They can be used. as pocket ion chambers are, to complement a primary dosemeter. They are small and need no phantom to measure neutrons from thermal to 25 MeV, so they can map fields varying rapidly with distance. Spectrometers are made from bubble device(s) with various thresholds. Bubble dosemeters with electronic counters may serve as area monitors. Such roles use the bubble device's high sensitivity, immediate results, freedom from interference, and flat energy response while avoiding its weaknesses in dynamic range, lifetime, and variation of response with temperature. RP RIEL, G (reprint author), USN,CTR SURFACE WARFARE,CODE R41,NEW HAMPSHIRE AVE,WHITE OAK,MD 20903, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1993 VL 47 IS 1-4 BP 543 EP 545 PG 3 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LN648 UT WOS:A1993LN64800113 ER PT J AU NELSON, ME GORDON, R AF NELSON, ME GORDON, R TI COMPARISON OF NEUTRON MEASUREMENTS AT LINACS USING BUBBLE DOSIMETERS TO OTHER NEUTRON DETECTORS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON SOLID STATE DOSIMETRY CY JUL 13-17, 1992 CL WASHINGTON, DC SP NIH, US DOE, INT SENSOR TECHNOL, LANDAUER, NUCL TECHNOL PUBL, SCI APPL INT, SIEMENS GAMMASON, SOLON TECHNOL, VICTOREEN AB The responses are presented of bubble dosemeters and several other dosimetry devices when used to measure neutron production at two different electron linear accelerators (linacs), one of which is used in chemotherapy. The accelerators produced maximum beam energies of 20 and 40 MeV respectively. The first linac studied was located in a hospital and used in chemotherapy treatments, while the second was used for industrial irradiations. The devices compared with the bubble dosemeter included etched track devices (CR-39), and thermoluminescent detectors (TLD). Since the detectors were placed at different axial and radial locations, results are given on the neutron spatial distribution around each accelerator. Data is also presented for different linac collimator configurations. The study found relatively large differences in the measured neutron dose between the TLD and other devices. An explanation of these and other results is given in the paper. RP NELSON, ME (reprint author), USN ACAD,NAVAL ARCHITECTURE OCEAN & MARINE ENGN,590 HOLLOWAY RD,ANNAPOLIS,MD 21402, USA. NR 0 TC 4 Z9 4 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1993 VL 47 IS 1-4 BP 547 EP 550 PG 4 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LN648 UT WOS:A1993LN64800114 ER PT J AU SWANDIC, JR AF SWANDIC, JR TI STATISTICS OF BUBBLE FORMATION IN BUBBLE DOSIMETERS SO RADIATION PROTECTION DOSIMETRY LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON SOLID STATE DOSIMETRY CY JUL 13-17, 1992 CL WASHINGTON, DC SP NIH, US DOE, INT SENSOR TECHNOL, LANDAUER, NUCL TECHNOL PUBL, SCI APPL INT, SIEMENS GAMMASON, SOLON TECHNOL, VICTOREEN AB Bubble dosemeters contain a large number of microscopic droplets of superheated liquid suspended in a gel. Individual particles of an incident flux, such as neutrons, can deposit enough energy to produce a critical size vapour bubble, which leads to vaporisation of an entire droplet. Absorption of an incident microwave field can raise the droplet temperature high enough to produce homogeneous nucleation at an observable rate. Both such triggering mechanisms are inherently stochastic. One can obtain expressions for the statistical distribution of the number of bubbles formed upon exposure to a constant external source for a specific time period. The response to a microwave field (a thermal effect) is compared with that of a flux of particles such as neutrons. The temperature dependence is of particular interest. RP SWANDIC, JR (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,CODE R36,SILVER SPRING,MD 20903, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU NUCLEAR TECHNOLOGY PUBL PI ASHFORD PA PO BOX 7, ASHFORD, KENT, ENGLAND TN23 1YW SN 0144-8420 J9 RADIAT PROT DOSIM JI Radiat. Prot. Dosim. PY 1993 VL 47 IS 1-4 BP 559 EP 561 PG 3 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA LN648 UT WOS:A1993LN64800117 ER PT J AU ROSE, RB AF ROSE, RB TI A HIGH-LATITUDE IONOSPHERIC DISTURBANCE IMPACT ASSESSMENT SYSTEM SO RADIO SCIENCE LA English DT Article ID INTERPLANETARY SHOCKS AB The Disturbance Impact Assessment System (DIAS) is a computer software package designed to assess and predict the impact of solar flares on high-latitude HF radio communications. The analysis spans the period between the flare onset (T0 hours) and the expected subsiding of its effects 5 days later (T120 hours). DIAS supports a HF communications system and when integrated into it, its operation will be entirely transparent to the user. A stand-alone PC version was designed for tutorial purposes. Key features combine the capabilities of the algorithmic PROPHET HF signal assessment system with expert system technology. The initial system provides qualitative advice and warnings. The rule sets in DIAS cover the following types of disturbances: (1) sudden ionospheric disturbances, (2) polar cap absorption, (3) ionospheric storm, (4) auroral zone absorption, and (5) auroral sporadic E and auroral E. C1 USN,CTR OCEAN SYST,DIV OCEAN & ATHMOSPHER SCI,SAN DIEGO,CA 92152. NR 20 TC 4 Z9 4 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 1993 VL 28 IS 1 BP 97 EP 104 DI 10.1029/92RS01780 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 KL227 UT WOS:A1993KL22700008 ER PT B AU CLEMENTS, PC HEITMEYER, CL LABAW, BG ROSE, AT AF CLEMENTS, PC HEITMEYER, CL LABAW, BG ROSE, AT GP IEEE COMP SOC TI MT - A TOOLSET FOR SPECIFYING AND ANALYZING REAL-TIME SYSTEMS SO REAL-TIME SYSTEMS SYMPOSIUM: PROCEEDINGS LA English DT Proceedings Paper CT Real-Time Systems Symposium CY DEC 01-03, 1993 CL RALEIGH-DURHAM, NC SP IEEE COMP SOC, TECH COMM REAL TIME SYST C1 USN,CTR HIGH ASSURANCE COMP SYST,WASHINGTON,DC 20375. RI Heitmeyer, Constance/F-6500-2011; OI Heitmeyer, Constance/0000-0001-7942-9309 NR 0 TC 19 Z9 19 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 BN 0-8186-4480-X PY 1993 BP 12 EP 22 PG 11 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BZ93L UT WOS:A1993BZ93L00002 ER PT J AU ANGUS, WJ WITT, MA LAREDO, D NETZER, DW AF ANGUS, WJ WITT, MA LAREDO, D NETZER, DW TI SOLID-FUEL SUPERSONIC COMBUSTION SO RECHERCHE AEROSPATIALE LA English DT Article DE SOLID PROPELLANTS; SUPERSONIC COMBUSTION; PROPELLANT COMBUSTION; COMBUSTION EFFICIENCY ID RAMJETS AB A solid fuel scramjet which utilized a combustor made of Plexiglas has been successfully demonstrated. Hot air entered the Plexiglas combustor with a Mach number of 1.5. A small amount of hydrogen gas was injected into a mixed supersonic-subsonic flame stabilization zone at the head-end of the combustor to help sustain combustion. The combustor consisted of a short, constant area section followed by a diverging section. Combustor exit Mach numbers were typically 1.1-1.4 and combustion efficiencies as high as 87% have been attained with equivalence ratios between 0.49-0.65. Nozzle exit temperature rake measurements indicated that the rough surface generated in the near thermally choked constant diameter region generated enough mixing to provide high centerline temperatures. However, to date the heat addition and wall friction induced losses have resulted in 50-70% losses in stagnation pressure across the combustor. C1 NATL RES COUNCIL,WASHINGTON,DC 20418. RP ANGUS, WJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 10 TC 6 Z9 8 U1 0 U2 0 PU DUNOD PI MONTROUGE CEDEX PA 15 RUE GOSSIN, 92543 MONTROUGE CEDEX, FRANCE SN 0034-1223 J9 RECH AEROSPATIALE JI Rech. Aerosp. PY 1993 IS 6 BP 1 EP 8 PG 8 WC Engineering, Aerospace SC Engineering GA NM660 UT WOS:A1993NM66000001 ER PT J AU BURGER, GA AF BURGER, GA TI 3-IN-1 BLOCKS AND CONTINUOUS 3-IN-1 BLOCKS - REPLY SO REGIONAL ANESTHESIA LA English DT Letter RP BURGER, GA (reprint author), USN HOSP,DEPT ANESTHESIOL,SAN DIEGO,CA 92134, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS PI NEW YORK PA 650 AVENUE OF THE AMERICAS, NEW YORK, NY 10011 SN 0146-521X J9 REGION ANESTH JI Reg. Anesth. PD JAN-FEB PY 1993 VL 18 IS 1 BP 64 EP 64 PG 1 WC Anesthesiology SC Anesthesiology GA KM644 UT WOS:A1993KM64400015 PM 8448104 ER PT B AU DUTTA, I MITRA, S WIEST, AD AF DUTTA, I MITRA, S WIEST, AD BE Barrera, EV Dutta, I TI SOME EFFECTS OF THERMAL RESIDUAL-STRESSES ON THE STRAIN RESPONSE OF GRAPHITE-ALUMINUM COMPOSITES DURING THERMAL CYCLING SO RESIDUAL STRESSES IN COMPOSITES: MEASUREMENT, MODELING & EFFECTS ON THERMO-MECHANICAL BEHAVIOR LA English DT Proceedings Paper CT Symposium on Residual Stresses in Composites CY FEB 21-25, 1993 CL DENVER, CO SP MINERALS MET & MAT SOC, STRUCT MAT DIV C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. NR 0 TC 7 Z9 7 U1 0 U2 1 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-216-7 PY 1993 BP 273 EP 292 PG 20 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA BZ39Y UT WOS:A1993BZ39Y00018 ER PT J AU ELLER, J MCCARRON, W AF ELLER, J MCCARRON, W TI A PLEA FOR INTERDISCIPLINARY STUDY - A SUPPLEMENT TO A 'GRAVITYS RAINBOW COMPANION' SO RESOURCES FOR AMERICAN LITERARY STUDY LA English DT Article C1 E TEXAS STATE UNIV,COMMERCE,TX 75428. RP ELLER, J (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 9 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 1993 VL 19 IS 1 BP 94 EP 106 PG 13 WC Literature, American SC Literature GA LE758 UT WOS:A1993LE75800007 ER PT J AU LOONEY, RE AF LOONEY, RE TI GOVERNMENT EXPENDITURES AND THIRD-WORLD ECONOMIC-GROWTH IN THE 1980S - THE IMPACT OF DEFENSE EXPENDITURES SO REVUE CANADIENNE D ETUDES DU DEVELOPPEMENT-CANADIAN JOURNAL OF DEVELOPMENT STUDIES LA English DT Article AB The purpose of this paper is to examine the possibility of using savings from major reductions in Third World defense spending as stimulus to economic growth. This reorientation of expenditures is particularly significant in light of new World Bank and International Monetary policies directed toward reducing lending to countries with excessive levels of military expenditure. The main findings of the study suggest that reduced military expenditures, unless confined to arms imports, are unlikely in and of themselves to provide much of an impetus for accelerated growth. RP LOONEY, RE (reprint author), USN,POSTGRAD SCH,NATL SECUR AFFAIRS,MONTEREY,CA 93940, USA. NR 45 TC 1 Z9 1 U1 0 U2 0 PU INST INT DEV CO-OP PI OTTAWA PA UNIV OTTAWA 25 UNIVERSITE, OTTAWA ON K1N 6N5, CANADA SN 0225-5189 J9 REV CAN ETUD DEV JI Rev. Can. Etud. Dev.-Can. J. Dev. Stud. PY 1993 VL 14 IS 1 BP 23 EP 42 PG 20 WC Planning & Development SC Public Administration GA LG462 UT WOS:A1993LG46200002 ER PT S AU ESQUIRE, RG PEDERSON, ED COVILL, PJ SMITH, PF AF ESQUIRE, RG PEDERSON, ED COVILL, PJ SMITH, PF BE Malamud, D Tabak, L TI RELATIONSHIP OF PAROTID-SALIVA C-REACTIVE PROTEIN TO CATECHOLAMINE RELEASE SO SALIVA AS A DIAGNOSTIC FLUID SE ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Proceedings Paper CT CONF ON SALIVA AS A DIAGNOSTIC FLUID CY OCT 22-25, 1992 CL PANAMA CITY BEACH, FL SP NEW YORK ACAD SCI, BLOCK DRUG, COLGATE PALMOLIVE, EPITOPE, NASA, NIDR, SALIVA DIAGNOST SYST, ABBOTT LABS, ENZYMATICS, HOFFMANN LA ROCHE RP ESQUIRE, RG (reprint author), USN,DENT RES INST,GREAT LAKES,IL 60088, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA NEW YORK SN 0077-8923 BN 0-89766-787-5 J9 ANN NY ACAD SCI JI Ann.NY Acad.Sci. PY 1993 VL 694 BP 276 EP 279 DI 10.1111/j.1749-6632.1993.tb18363.x PG 4 WC Dentistry, Oral Surgery & Medicine; Endocrinology & Metabolism; Immunology; Physiology SC Dentistry, Oral Surgery & Medicine; Endocrinology & Metabolism; Immunology; Physiology GA BZ06S UT WOS:A1993BZ06S00028 PM 8215065 ER PT J AU VASUDEVAN, AK SADANANDA, K LOUAT, N AF VASUDEVAN, AK SADANANDA, K LOUAT, N TI 2 CRITICAL STRESS INTENSITIES FOR THRESHOLD FATIGUE CRACK-PROPAGATION SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID MECHANISMS C1 FAIRFAX MAT GRP,ALEXANDRIA,VA 22310. USN,RES LAB,WASHINGTON,DC 20375. RP VASUDEVAN, AK (reprint author), OFF NAVAL RES,CODE 1222,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 15 TC 74 Z9 75 U1 2 U2 4 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 1993 VL 28 IS 1 BP 65 EP 70 DI 10.1016/0956-716X(93)90538-4 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KD761 UT WOS:A1993KD76100012 ER PT B AU COSTLEY, RD BERTHELOT, YH AF COSTLEY, RD BERTHELOT, YH BE Vary, A TI A LASER-BASED TECHNIQUE TO RESOLVE MODE PROPAGATION OF LAMB WAVES IN PLATES SO SECOND INTERNATIONAL CONFERENCE ON ACOUSTO-ULTRASONICS: ACOUSTO-ULTRASONIC MATERIALS CHARACTERIZATION LA English DT Proceedings Paper CT 2nd International Conference on Acousto-Ultrasonics: Acousto-Ultrasonic Materials Characterization CY JUN 24-25, 1993 CL ATLANTA, GA SP AMER SOC NONDESTRUCT TESTING INC C1 USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32806. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC NONDESTRUCTIVE TESTING PI COLUMBUS PA 1711 ARLINGATE LANE, PO BOX 28518, COLUMBUS, OH 43228-0518 BN 0-931403-20-0 PY 1993 BP 85 EP 94 PG 10 WC Acoustics; Materials Science, Characterization & Testing SC Acoustics; Materials Science GA BA75R UT WOS:A1993BA75R00010 ER PT J AU GOLDING, TD DURA, JA WANG, H ZBOROWSKI, JT VIGLIANTE, A CHEN, HC MILLER, JH MEYER, JR AF GOLDING, TD DURA, JA WANG, H ZBOROWSKI, JT VIGLIANTE, A CHEN, HC MILLER, JH MEYER, JR TI INVESTIGATION OF SB/GASB MULTILAYER STRUCTURES FOR POTENTIAL APPLICATION AS AN INDIRECT NARROW-BANDGAP MATERIAL SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON NARROW GAP SEMICONDUCTORS CY JUL 19-23, 1992 CL SOUTHAMPTON, ENGLAND SP BRIT ASSOC CRYSTAL GROWTH, USA, EUROPEAN OFF, GEC, MARCONI MAT TECHNOL, GEC, SENSORS, LEICA CAMBRIDGE, MCP, WATER TECHNOL, PHILIPS INFRARED, ROCKWELL INT SCI CTR, SAT, FRANCE ID TRANSPORT-PROPERTIES AB In this paper we provide the rationale, and a preliminary experimental investigation of, the Sb/GaSb system as a potential indirect narrow-gap superlattice, where spatial quantization effects are proposed to induce a positive valence-conduction band energy gap in the Sb semimetal layers. The experimental study has investigated growth of Sb/GaSb single heterojunctions and elementary multilayer structures using molecular beam epitaxy. Although Sb is rhombohedral and GaSb has the cubic zinc blende structure, the biatomic planar structure of Sb mimics the (111) plane in the zinc blende structure, and registry between the zinc blende and rhombohedral lattice can be preserved if epitaxy is achieved along the [111] direction. We show that high-quality Sb layers can be grown epitaxially on GaSb[lll] homoepitaxial films, and that GaSb can be subsequently grown on Sb. The epilayer growth and heterojunction structure have been characterized by in situ reflection high-energy electron diffraction, x-ray diffraction and x-ray photoelectron spectroscopy. Electrical properties of Sb epilayers with thicknesses in the range 150-2500 angstrom have been determined by temperature-dependent Hall measurements. C1 UNIV HOUSTON,CTR SPACE VACUUM EPITAXY,HOUSTON,TX 77204. USN,RES LAB,WASHINGTON,DC 20375. RP GOLDING, TD (reprint author), UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204, USA. RI Dura, Joseph/B-8452-2008 OI Dura, Joseph/0000-0001-6877-959X NR 11 TC 14 Z9 14 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD JAN PY 1993 VL 8 IS 1 SU S BP S117 EP S120 DI 10.1088/0268-1242/8/1S/026 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA KM535 UT WOS:A1993KM53500027 ER PT J AU HOFFMAN, CA MEYER, JR BARTOLI, FJ AF HOFFMAN, CA MEYER, JR BARTOLI, FJ TI NOVEL MAGNETOTRANSPORT AND MAGNETOOPTICAL PROCESSES IN SEMIMETALLIC HGTE-CDTE SUPERLATTICES SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON NARROW GAP SEMICONDUCTORS CY JUL 19-23, 1992 CL SOUTHAMPTON, ENGLAND SP BRIT ASSOC CRYSTAL GROWTH, USA, EUROPEAN OFF, GEC, MARCONI MAT TECHNOL, GEC, SENSORS, LEICA CAMBRIDGE, MCP, WATER TECHNOL, PHILIPS INFRARED, ROCKWELL INT SCI CTR, SAT, FRANCE ID MOLECULAR-BEAM EPITAXY; CYCLOTRON-RESONANCE; BAND-STRUCTURE; GAP; ELECTRON; TRANSPORT; HETEROSTRUCTURES; HETEROJUNCTIONS; MOBILITIES; WELLS AB Recent observations of novel electronic processes in semimetallic HgTe-CdTe superlattices will be reviewed, in the context of distinctive features in the superlattice band structures. It will be demonstrated that many of the observed phenomena are either directly or indirectly related to an anticrossing of the HH1 band, which is nearly dispersionless in the growth direction k(z), and the El band, which has strong dispersion in k(z). For example, it has recently been demonstrated that there is a critical magnetic field above which one can magnetically activate a bipolar plasma whose density increases linearly with B - B(crit). A second example is the observation of broad quantum Hall plateaux in superlattices with strong 3D dispersion, which contradicts the previous theoretical understanding of how dimensionality influences the quantum Hall effect. Other topics include recent technological advances towards more sophisticated structures (e.g. controlled modulation doping, set-back doping and submicron lateral patterning), comprehensive new theoretical descriptions of magnetotransport and magneto-absorption in HgTe CdTe superlattices, and novel processes predicted to occur in HgTe-CdTe quantum wires. RP HOFFMAN, CA (reprint author), USN,RES LAB,CODE 6551,WASHINGTON,DC 20375, USA. NR 44 TC 10 Z9 10 U1 2 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD JAN PY 1993 VL 8 IS 1 SU S BP S48 EP S57 DI 10.1088/0268-1242/8/1S/012 PG 10 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA KM535 UT WOS:A1993KM53500013 ER PT J AU OMAGGIO, JP WAGNER, RJ MEYER, JR HOFFMAN, CA YANG, MJ CHOW, DH MILES, RH AF OMAGGIO, JP WAGNER, RJ MEYER, JR HOFFMAN, CA YANG, MJ CHOW, DH MILES, RH TI MAGNETOOPTIC AND MAGNETOTRANSPORT STUDY OF INAS/GA1-XINXSB SUPERLATTICES SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON NARROW GAP SEMICONDUCTORS CY JUL 19-23, 1992 CL SOUTHAMPTON, ENGLAND SP BRIT ASSOC CRYSTAL GROWTH, USA, EUROPEAN OFF, GEC, MARCONI MAT TECHNOL, GEC, SENSORS, LEICA CAMBRIDGE, MCP, WATER TECHNOL, PHILIPS INFRARED, ROCKWELL INT SCI CTR, SAT, FRANCE ID INFRARED DETECTORS AB InAs/Ga1-xInxSb superlattices have been investigated by magneto-optical and magnetotransport techniques. Bandgaps, determined from interband magneto-optical measurements and from the temperature dependence of the intrinsic carrier concentration, are in the long-wavelength infrared region (8.3 to 12.4 pm) and are in good agreement with gaps calculated from a two-band model. Both electron and hole effective masses were measured by cyclotron resonance and the electron effective mass is found to be a factor of 4-5 times larger than in HgCdTe (the industry-standard IR material). This is necessary for reduced dark currents and good optical absorption coefficients in this material. Finally, the first observation of higher-order electron and hole subbands (by interband magneto-optics) in this material system is reported. C1 HUGHES RES LABS,MALIBU,CA 90265. RP OMAGGIO, JP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 15 Z9 15 U1 2 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD JAN PY 1993 VL 8 IS 1 SU S BP S112 EP S116 DI 10.1088/0268-1242/8/1S/025 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA KM535 UT WOS:A1993KM53500026 ER PT J AU WATERMAN, JR SHANABROOK, BV WAGNER, RJ YANG, MJ DAVIS, JL OMAGGIO, JP AF WATERMAN, JR SHANABROOK, BV WAGNER, RJ YANG, MJ DAVIS, JL OMAGGIO, JP TI THE EFFECT OF INTERFACE BOND TYPE ON THE STRUCTURAL AND OPTICAL-PROPERTIES OF GASB/INAS SUPERLATTICES SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON NARROW GAP SEMICONDUCTORS CY JUL 19-23, 1992 CL SOUTHAMPTON, ENGLAND SP BRIT ASSOC CRYSTAL GROWTH, USA, EUROPEAN OFF, GEC, MARCONI MAT TECHNOL, GEC, SENSORS, LEICA CAMBRIDGE, MCP, WATER TECHNOL, PHILIPS INFRARED, ROCKWELL INT SCI CTR, SAT, FRANCE ID PHONONS AB The effect of interface bond configuration on the structural and optical properties of short-period (almost-equal-to 50 angstrom) GaSb/InAs superlattices has been examined. Structures consisting of eight monolayers of GaSb and seven monolayers of InAs with either 'GaAs-like' or 'InSb-like' interface bonds were grown by MBE. Evidence for differences in the structural properties, vibrational properties and band structure of the two types of material was obtained using x-ray diffraction, Raman scattering, interband magneto-absorption and photoconductivity measurements. RP WATERMAN, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 53 Z9 53 U1 0 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD JAN PY 1993 VL 8 IS 1 SU S BP S106 EP S111 DI 10.1088/0268-1242/8/1S/024 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA KM535 UT WOS:A1993KM53500025 ER PT J AU YANG, MJ LINCHUNG, PJ WAGNER, RJ WATERMAN, JR MOORE, WJ SHANABROOK, BV AF YANG, MJ LINCHUNG, PJ WAGNER, RJ WATERMAN, JR MOORE, WJ SHANABROOK, BV TI FAR-INFRARED SPECTROSCOPY IN STRAINED ALSB/INAS/ALSB QUANTUM-WELLS SO SEMICONDUCTOR SCIENCE AND TECHNOLOGY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON NARROW GAP SEMICONDUCTORS CY JUL 19-23, 1992 CL SOUTHAMPTON, ENGLAND SP BRIT ASSOC CRYSTAL GROWTH, USA, EUROPEAN OFF, GEC, MARCONI MAT TECHNOL, GEC, SENSORS, LEICA CAMBRIDGE, MCP, WATER TECHNOL, PHILIPS INFRARED, ROCKWELL INT SCI CTR, SAT, FRANCE ID SPACE-CHARGE LAYERS; CYCLOTRON-RESONANCE; GAAS; ELECTRONS; HETEROSTRUCTURES; DENSITY AB We have studied the cyclotron resonance (CR) of 2D electrons in strained InAs single quantum wells, which are grown on either a GaSb or an AlSb buffer layer in order to vary the degree of strain in InAs. For samples with a GaSb buffer layer, the measured CR Mass, depending upon the quantum well thickness, varies from 0.0339m0 to 0.0468m0, which is heavier than that of bulk InAs at the conduction band edge, 0.0234m0. This finding is quantitatively explained by the non-parabolicity effect in InAs and the mass renormalization eff ect, originating from the penetration of the electron wavefunction into the barriers. On the other hand, for samples with an AlSb buffer layer, the CR mass, depending upon the carrier concentration, varies from 0.0320m0 to 0.0412m0, and is lighter than that of equal well thickness but with a GaSb buffer. This reduction in mass is accounted for by the stronger misfit strain in InAs when an AlSb buffer layer is used. RP YANG, MJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 15 Z9 15 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0268-1242 J9 SEMICOND SCI TECH JI Semicond. Sci. Technol. PD JAN PY 1993 VL 8 IS 1 SU S BP S129 EP S132 DI 10.1088/0268-1242/8/1S/029 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA KM535 UT WOS:A1993KM53500030 ER PT J AU HYAMS, KC KROGWOLD, RA BROCK, S WIGNALL, FS CROSS, E HAYES, C AF HYAMS, KC KROGWOLD, RA BROCK, S WIGNALL, FS CROSS, E HAYES, C TI HETEROSEXUAL TRANSMISSION OF VIRAL-HEPATITIS AND CYTOMEGALOVIRUS-INFECTION AMONG UNITED-STATES MILITARY PERSONNEL STATIONED IN THE WESTERN PACIFIC SO SEXUALLY TRANSMITTED DISEASES LA English DT Article ID C VIRUS-INFECTION; RISK-FACTORS AB A serosurvey of United States military personnel presenting to a sexually transmitted diseases (STD) clinic or reporting for routine physical examination in the Philippines was conducted to determine the risk factors for hepatitis B (anti-HBc), hepatitis C (anti-HCV), and cytomegalovirus (anti-CMV) infection. Among 470 male study subjects, 74 (15.7%) were positive for anti-HBc, five (1.1%) were positive for anti-HCV, and 232 (49.4%) were positive for anti-CMV. A history of a STD (odds ratio [OR] = 7.7) and contact with a female prostitute (OR = 2.3) were significantly associated with anti-HBc seropositivity after adjusting for age, race/ethnicity, foreign birth, and classification as either a STD or routine examination patient. Anti-CMV seropositivity was significantly associated with a history of a STD (adjusted OR = 2.0). These data suggest that in this military population, heterosexual activity was a risk factor for acquiring hepatitis B and CMV infection. United States military personnel stationed in high-risk areas of the western Pacific, particularly patients presenting to STD clinics, may need to be targeted for hepatitis B vaccination. C1 USN,DEPT EPIDEMIOL,BETHESDA,MD 20814. MED GRP 542D,KIRTLAND AFB,NM. PACAF SGPM,HICKAM,HI. USN,ENVIRONM & PREVENT MED UNIT 6,HONOLULU,HI. NR 26 TC 17 Z9 19 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0148-5717 J9 SEX TRANSM DIS JI Sex. Transm. Dis. PD JAN-FEB PY 1993 VL 20 IS 1 BP 36 EP 40 DI 10.1097/00007435-199301000-00007 PG 5 WC Infectious Diseases SC Infectious Diseases GA KK500 UT WOS:A1993KK50000007 PM 8381561 ER PT J AU HEWER, G AF HEWER, G TI EXISTENCE THEOREMS FOR POSITIVE SEMIDEFINITE AND SIGN INDEFINITE STABILIZING SOLUTIONS OF H-INFINITY RICCATI-EQUATIONS SO SIAM JOURNAL ON CONTROL AND OPTIMIZATION LA English DT Article DE H-INFINITY-OPTIMAL CONTROL; RICCATI EQUATIONS; BOUNDED REAL SYSTEM ID LINEAR-SYSTEMS; SENSITIVITY; TIME AB The existence of both positive semidefinite and sign indefinite stabilizing solutions of H(infinity)-type Riccati equations is determined via joint eigenvalue and Hamiltonian tests. These tests determine the inertia properties of the solutions. They are dependent on a formula-derived in this paper-that shows how the solution of game Riccati equations can be decomposed into a sum of two well-known Riccati equations, namely, the standard filter Riccati equation and the bounded real Riccati equation. Other properties of stabilizing solutions such as solution partial order, spectral radius monotonicity, and rank are also discussed. RP HEWER, G (reprint author), USN,CTR WEAP,CHINA LAKE,CA 93555, USA. NR 27 TC 12 Z9 12 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0363-0129 J9 SIAM J CONTROL OPTIM JI SIAM J. Control Optim. PD JAN PY 1993 VL 31 IS 1 BP 16 EP 29 DI 10.1137/0331002 PG 14 WC Automation & Control Systems; Mathematics, Applied SC Automation & Control Systems; Mathematics GA KK826 UT WOS:A1993KK82600002 ER PT J AU FRENZEN, CL FISCHER, I AF FRENZEN, CL FISCHER, I TI ON A CONJECTURE OF PIERCE FOR PERMANENTS OF SINGULAR CORRELATION-MATRICES SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE PERMANENT; CORRELATION MATRIX; ASYMPTOTIC APPROXIMATION AB Let I(n) be the n-by-n identity matrix, let J(n) be the n-by-n matrix, all of whose entries equal 1, and let Y(n) = n/(n - 1)I(n) - 1/(n - 1)J(n). Y(n) is then a singular correlation matrix, that is, Y(n) is a singular positive semidefinite Hermitian matrix all of whose diagonal elements equal 1. Pierce has conjectured that if A is a singular correlation matrix, the minimum value of the permanent of A occurs exactly when A is similar to Y(n) by a diagonal unitary matrix. If Pierce's conjecture is true, then the permanent of Y(n) (per Y(n)) must be a decreasing function of n. This paper proves that per Y(n) is strictly decreasing for n = 2, 3, 4, . . . . RP FRENZEN, CL (reprint author), USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD JAN PY 1993 VL 14 IS 1 BP 74 EP 81 DI 10.1137/0614006 PG 8 WC Mathematics, Applied SC Mathematics GA KJ695 UT WOS:A1993KJ69500006 ER PT B AU HENSON, VE SHAKER, AW AF HENSON, VE SHAKER, AW BE Melson, ND Manteuffel, TA McCormick, SF TI MULTIGRID METHODS FOR A SEMILINEAR PDE IN THE THEORY OF PSEUDOPLASTIC FLUIDS SO SIXTH COPPER MOUNTAIN CONFERENCE ON MULTIGRID METHODS SE NASA CONFERENCE PUBLICATION LA English DT Proceedings Paper CT 6th Copper Mountain Conference on Multigrid Methods CY APR 04-09, 1993 CL COPPER MT, CO SP NASA, USAF, OFF SCI RES, BOLLING AIR FORCE BASE, US DOE, NATL SCI FDN C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93940. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NASA PI WASHINGTON PA WASHINGTON, DC 20546 J9 NASA CONF P PY 1993 VL 3224 BP 231 EP 242 PN 1-2 PG 12 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA BB85A UT WOS:A1993BB85A00016 ER PT B AU MONET, DG AF MONET, DG BE Soifer, BT TI THE NOFS PMM PROGRAM SO SKY SURVEYS: PROTOSTARS TO PROTOGALAXIES SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Sky Surveys: Protostars to Protogalaxies, in Honor of Gerry Neugebauer CY SEP 16-18, 1992 CL CALIF INST TECHNOL, PASADENA, CA SP CALIF INST TECHNOL HO CALIF INST TECHNOL C1 USN OBSERV,FLAGSTAFF,AZ 86002. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-62-7 J9 ASTR SOC P PY 1993 VL 43 BP 139 EP 143 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94S UT WOS:A1993BZ94S00021 ER PT S AU STRONG, KT TEAM, Y AF STRONG, KT TEAM, Y BE Gabriel, AH TI CORONAL OBSERVATIONS FROM THE SOFT-X-RAY TELESCOPE ON YOHKOH SO SOLAR CORONA SE ADVANCES IN SPACE RESEARCH LA English DT Article; Proceedings Paper CT Symposium E1 of the COSPAR 29th Plenary Meeting CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPACE RES, INT UNION GEODESY & GEOPHYS, INT ASSOC GEOMAGNETISM & AERON ID BRIGHT POINTS; SOLAR-A AB The Yohkoh payload includes a Soft X-ray Telescope (SXT) which is capable of taking high-resolution (2.5 arcsec) images of the Sun through several X-ray and optical filters. A CCD camera provides images with a low background, and large dynamic range and at a rapid cadence (>2 s), which enables the SXT to observe the effects of flares while continuing to observe the fainter quiet-Sun features. We present the observations from the SXT that illustrate how the faint coronal loops that make up the complex structure of the quiet Sun evolve on a variety of timescales from seconds to months. We describe a variety of coronal structures, such as coronal holes, bright points, the large-scale quiet coronal loops, and active regions, to show the wide range of opportunities that Yohkoh presents to further our understanding of the solar corona. C1 UNIV TOKYO,TOKYO,JAPAN. UNIV HAWAII,HONOLULU,HI 96822. STANFORD UNIV,STANFORD,CA 94305. SOLAR PHYS RES CORP,TUCSON,AZ. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. USN,RES LAB,WASHINGTON,DC 20375. RP STRONG, KT (reprint author), LOCKHEED SOLAR & ASTROPHYS LAB,PALO ALTO,CA 94304, USA. NR 23 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042478-3 J9 ADV SPACE RES PY 1993 VL 14 IS 4 BP 3 EP 11 PG 9 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BA32J UT WOS:A1993BA32J00002 ER PT S AU DERE, KP AF DERE, KP BE Gabriel, AH TI EXPLOSIVE EVENTS, MAGNETIC RECONNECTION, AND CORONAL HEATING SO SOLAR CORONA SE ADVANCES IN SPACE RESEARCH LA English DT Article; Proceedings Paper CT Symposium E1 of the COSPAR 29th Plenary Meeting CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPACE RES, INT UNION GEODESY & GEOPHYS, INT ASSOC GEOMAGNETISM & AERON ID SOLAR TRANSITION ZONE; FLARE ENERGY BUILDUP; ACTIVE REGION; QUIET SUN; FLUX; FIELDS; CANCELLATION AB Signatures of explosive events are prominent in transition region spectra where they display exceptionally large velocities (>100 km s(-1)) in small areas (1500 km). Their physical properties, deduced from previous analyses of HRTS spectra and more recent work, are summarized here. It now appears that the explosive events are associated with the process of magnetic cancellation and HRTS data obtained during the most recent rocket night in 1990 provide direct evidence for this assertion. Flux cancellation, which tends to proceed on time-scales of hours, most likely involves magnetic reconnection in a very bursty manner which explains the small, short-lived explosive events. These reconnection events are part of a larger pattern where small flux elements emerge in the supergranule centers and are transported to the boundaries to continually regenerate the network fields on a timescale of about 8 hours. These timescales are also sufficiently short to account for the energetics of the quiet sun. RP DERE, KP (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7663,WASHINGTON,DC 20375, USA. NR 23 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042478-3 J9 ADV SPACE RES PY 1993 VL 14 IS 4 BP 13 EP 22 PG 10 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BA32J UT WOS:A1993BA32J00003 ER PT S AU ANTIOCHOS, SK AF ANTIOCHOS, SK BE Gabriel, AH TI THE PHYSICS OF CORONAL CLOSED-FIELD STRUCTURES SO SOLAR CORONA SE ADVANCES IN SPACE RESEARCH LA English DT Article; Proceedings Paper CT Symposium E1 of the COSPAR 29th Plenary Meeting CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPACE RES, INT UNION GEODESY & GEOPHYS, INT ASSOC GEOMAGNETISM & AERON ID SOLAR TRANSITION REGION; CHROMOSPHERE; TEMPERATURE; ATMOSPHERES; ABUNDANCES; RADIATION; PLASMA; MODELS; LOOPS; SUN AB The properties of closed coronal loops are reviewed. First we discuss the main features of the static, hot loop models. In these models thermal conduction plays the dominant role in determining the temperature and density structure. Next the cool loop models and their implications for solar observations are discussed. Finally, some new theoretical results on coronal abundances are presented. It is argued that chromospheric evaporation, which is a basic feature of the hot model, can account for the observed anomalies in the coronal element abundances. RP ANTIOCHOS, SK (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7675,WASHINGTON,DC 20375, USA. RI Antiochos, Spiro/D-4668-2012 OI Antiochos, Spiro/0000-0003-0176-4312 NR 20 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042478-3 J9 ADV SPACE RES PY 1993 VL 14 IS 4 BP 139 EP 148 PG 10 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BA32J UT WOS:A1993BA32J00022 ER PT B AU KOWALSKI, MP SEELY, JF CRUDDACE, RG RIFE, JC BROWN, CM DOSCHEK, GA FELDMAN, U BARBEE, TW HUNTER, WR HOLLAND, GE BOYER, CN AF KOWALSKI, MP SEELY, JF CRUDDACE, RG RIFE, JC BROWN, CM DOSCHEK, GA FELDMAN, U BARBEE, TW HUNTER, WR HOLLAND, GE BOYER, CN BE Bely, PY Breckinridge, JB TI HIGH-RESOLUTION EUV SPECTROSCOPY - PERFORMANCE OF SPHERICAL MULTILAYER-COATED GRATINGS OPERATED AT NEAR NORMAL INCIDENCE SO SPACE ASTRONOMICAL TELESCOPES AND INSTRUMENTS II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Space Astronomical Telescopes and Instruments II CY APR 13-14, 1993 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NR 0 TC 8 Z9 8 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1181-7 J9 P SOC PHOTO-OPT INS PY 1993 VL 1945 BP 164 EP 175 DI 10.1117/12.158759 PG 12 WC Engineering, Aerospace; Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Engineering; Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BZ81R UT WOS:A1993BZ81R00019 ER PT S AU SILBERBERG, R CAMERON, RA TSAO, CH KASSIM, NE WEILER, KW AF SILBERBERG, R CAMERON, RA TSAO, CH KASSIM, NE WEILER, KW BE Trumper, J Cesarsky, C Palumbo, GGC Bignami, GF TI THE GAMMA-RAY LINE OF TI-44, COMBINED WITH RADIO OBSERVATIONS, AS A PROBE OF SUPERNOVA SO SPACE ASTRONOMY SE ADVANCES IN SPACE RESEARCH LA English DT Article; Proceedings Paper CT Symposium E2, and the Topical Meeting of the COSPAR Interdisciplinary Scientific Commission E of the COSPAR 29th Plenary Meeting CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPACE RES, INT ASTRON UNION, INT ACAD ASTRONAUT ID MODELS AB The decay of Ti-44 can be used to search for young Galactic supernova remnants (SNRs). While these objects may be hidden in obscured regions toward the inner Galaxy not accessible to optical telescopes, observations at both gamma ray and radio wavelengths can be used to discover and explore these objects. The OSSE instrument on the Compton Gamma Ray Observatory can observe the gamma ray Lines accompanying Ti-44-Sc-44-Ca-44 decay, especially the 1.16 MeV line, and detect recent supernovae (SNe) with ages up to several centuries. Centimeter wavelength radio continuum observations can then be used to identify the young SNRs associated with the gamma-ray detections. The radio observations provide information on the interaction of the SN blast wave with the progenitor star's circumstellar environment and local ISM, together with information on the expansion velocity and small scale structure of young SNRs. The determination of the radio morphology of young SNRs, whose SN type can be inferred from the gamma-ray observations, provides valuable insight into the interpretation of existing radio observations of older SNRs. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP SILBERBERG, R (reprint author), UNIV SPACE RES ASSOC,WASHINGTON,DC, USA. NR 11 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042353-1 J9 ADV SPACE RES PY 1993 VL 13 IS 12 BP 747 EP 750 DI 10.1016/0273-1177(93)90192-E PG 4 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BZ58Q UT WOS:A1993BZ58Q00100 ER PT S AU BERNHARDT, PA AF BERNHARDT, PA BE Bernhardt, PA Mohlmann, D Ip, WH TI PROCEEDINGS OF THE TOPICAL MEETING OF THE COSPAR INTERDISCIPLINARY SCIENTIFIC COMMISSION-D (MEETINGS D5 AND D7) OF THE COSPAR 29TH PLENARY MEETING HELD IN WASHINGTON, DC, USA, 28 AUGUST 5 SEPTEMBER, 1992 - PREFACE SO SPACE PLASMA PHYSICS SE ADVANCES IN SPACE RESEARCH LA English DT Editorial Material CT TOPICAL MEETING OF COSPAR-INTERDISCIPLINARY-SCIENTIFIC-COMMISSION : SPACE PLASMA PHYSICS, AT THE COSPAR 29TH PLENARY MEETING CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPAC RES, INT UNION RADIO SCI, INT UNION GEODESY & GEOPHYS, INT ASSOC GEOMAGNETISM & AERON RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA OXFORD SN 0273-1177 BN 0-08-042342-6 J9 ADV SPACE RES PY 1993 VL 13 BP 3 EP 4 PG 2 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Physics, Fluids & Plasmas SC Astronomy & Astrophysics; Geology; Physics GA BZ36Z UT WOS:A1993BZ36Z00001 ER PT S AU HUBA, JD BERNHARDT, PA FEDDER, JA LYON, JG MITCHELL, HG AF HUBA, JD BERNHARDT, PA FEDDER, JA LYON, JG MITCHELL, HG BE Bernhardt, PA Mohlmann, D Ip, WH TI MODELING THE PLASMA DYNAMICS OF THE CRRES G-9 AND G-10 BARIUM RELEASES SO SPACE PLASMA PHYSICS SE ADVANCES IN SPACE RESEARCH LA English DT Proceedings Paper CT TOPICAL MEETING OF COSPAR-INTERDISCIPLINARY-SCIENTIFIC-COMMISSION : SPACE PLASMA PHYSICS, AT THE COSPAR 29TH PLENARY MEETING CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPAC RES, INT UNION RADIO SCI, INT UNION GEODESY & GEOPHYS, INT ASSOC GEOMAGNETISM & AERON RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON PRESS LTD PI OXFORD PA OXFORD SN 0273-1177 BN 0-08-042342-6 J9 ADV SPACE RES PY 1993 VL 13 BP 45 EP 54 PG 10 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Physics, Fluids & Plasmas SC Astronomy & Astrophysics; Geology; Physics GA BZ36Z UT WOS:A1993BZ36Z00006 ER PT J AU DICK, SJ AF DICK, SJ TI THE SEARCH FOR EXTRATERRESTRIAL INTELLIGENCE AND THE NASA HIGH-RESOLUTION MICROWAVE SURVEY (HRMS) - HISTORICAL PERSPECTIVES SO SPACE SCIENCE REVIEWS LA English DT Review ID SETI AB The modern era of the Search for Extraterrestrial Intelligence RP DICK, SJ (reprint author), USN OBSERV,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 153 TC 3 Z9 3 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-6308 J9 SPACE SCI REV JI Space Sci. Rev. PY 1993 VL 64 IS 1-2 BP 93 EP 139 DI 10.1007/BF00819659 PG 47 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MR741 UT WOS:A1993MR74100002 ER PT S AU KAUFMAN, B CAMPION, R BRUEGGE, RWV AF KAUFMAN, B CAMPION, R BRUEGGE, RWV BE Teles, J Samii, MV TI AN OVERVIEW OF THE ASTRODYNAMICS FOR THE DEEP SPACE PROGRAM SCIENCE EXPERIMENT MISSION (DSPSE) SO SPACEFLIGHT DYNAMICS 1993, PTS 1 AND 2 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/NASA International Symposium: Spaceflight Dynamics 1993 CY APR 26-30, 1993 CL GREENBELT, MD SP AMER ASTRONAUT SOC, NASA C1 USN,RES LAB,EO HULBURT CTR SPACE RES,ASTRODYNAM & SPACE APPLICAT OFF,WASHINGTON,DC 20375. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-378-1 J9 ADV ASTRONAUT SCI PY 1993 VL 84 BP 141 EP 155 PN 1-2 PG 15 WC Engineering, Aerospace SC Engineering GA BA20M UT WOS:A1993BA20M00010 ER PT S AU DASENBROCK, RR AF DASENBROCK, RR BE Teles, J Samii, MV TI DSPSE AUTONOMOUS POSITION ESTIMATION EXPERIMENT SO SPACEFLIGHT DYNAMICS 1993, PTS 1 AND 2 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/NASA International Symposium: Spaceflight Dynamics 1993 CY APR 26-30, 1993 CL GREENBELT, MD SP AMER ASTRONAUT SOC, NASA C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 2 Z9 2 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-378-1 J9 ADV ASTRONAUT SCI PY 1993 VL 84 BP 203 EP 217 PN 1-2 PG 15 WC Engineering, Aerospace SC Engineering GA BA20M UT WOS:A1993BA20M00015 ER PT S AU MCLAUGHLIN, SF KAUFMAN, B DASENBROCK, R HOPE, A PICKARD, H MELVIN, P FRANK, M AF MCLAUGHLIN, SF KAUFMAN, B DASENBROCK, R HOPE, A PICKARD, H MELVIN, P FRANK, M BE Melton, RG Wood, LJ Thompson, RC Kerridge, SJ TI PLANNING AND EXECUTION OF THE FIELD-TEST OF A CID STAR TRACKER SO SPACEFLIGHT MECHANICS 1993 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Spaceflight Mechanics Meeting CY FEB 22-24, 1993 CL PASADENA, CA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 USN,RES LAB,BENDIX FIELD ENGN CORP,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-368-4 J9 ADV ASTRONAUT SCI PY 1993 VL 82 BP 3 EP 22 PN 1-2 PG 20 WC Engineering, Aerospace; Mechanics SC Engineering; Mechanics GA BZ64V UT WOS:A1993BZ64V00001 ER PT B AU SADANANDA, K FENG, CR JONES, HN PETROVIC, JJ AF SADANANDA, K FENG, CR JONES, HN PETROVIC, JJ BE Darolia, R Lewandowski, JJ Liu, CT Martin, PL Miracle, DB Nathal, MV TI CREEP OF INTERMETALLIC COMPOSITES - EFFECT OF GRAIN-SIZE VERSUS REINFORCEMENTS SO STRUCTURAL INTERMETALLICS LA English DT Proceedings Paper CT 1st International Symposium on Structural Intermetallics CY SEP 26-30, 1993 CL CHAMPION, PA SP MINERALS MET & MAT SOC, HIGH TEMP ALLOYS COMM, AMER SOC MET INT, AMER SOC MECH ENGINEERS C1 USN,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375. NR 0 TC 7 Z9 7 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-253-1 PY 1993 BP 809 EP 818 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA BZ64C UT WOS:A1993BZ64C00088 ER PT B AU CULBERTSON, JC NEWMAN, HS STROM, U POND, JM CHRISEY, DB HORWITZ, JS WOLF, SA AF CULBERTSON, JC NEWMAN, HS STROM, U POND, JM CHRISEY, DB HORWITZ, JS WOLF, SA BE Koch, H Lubbig, H TI LIGHT DETECTION USING HIGH-T(C) MICROSTRIP LINES SO SUPERCONDUCTING DEVICES AND THEIR APPLICATIONS SE SPRINGER PROCEEDINGS IN PHYSICS LA English DT Proceedings Paper CT 4TH INTERNATIONAL CONFERENCE on Superconducting and Quantum Effect Devices and Their Applications (SQUID 91) CY JUN 18-21, 1991 CL BERLIN, GERMANY SP DR WILHELM HEINRICH HERAEUS & ELSE HERAEUS STIFT, JAPANESE GERMAN CTR BERLIN, PHYS TECH BUNDESANSTALT C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU SPRINGER-VERLAG BERLIN PI BERLIN 33 PA HEIDELBERGER PLATZ 3, W-1000 BERLIN 33, GERMANY BN 3-540-55396-7 J9 SPRINGER PROC PHYS PY 1993 VL 64 BP 180 EP 185 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA BA73R UT WOS:A1993BA73R00030 ER PT B AU CLAASSEN, JH EVETTS, JE SOMEKH, RE BARKER, ZH AF CLAASSEN, JH EVETTS, JE SOMEKH, RE BARKER, ZH BE Koch, H Lubbig, H TI CHARACTERIZATION OF NORMAL SUPERCONDUCTING INTERFACES - A NOVEL TECHNIQUE SO SUPERCONDUCTING DEVICES AND THEIR APPLICATIONS SE SPRINGER PROCEEDINGS IN PHYSICS LA English DT Proceedings Paper CT 4TH INTERNATIONAL CONFERENCE on Superconducting and Quantum Effect Devices and Their Applications (SQUID 91) CY JUN 18-21, 1991 CL BERLIN, GERMANY SP DR WILHELM HEINRICH HERAEUS & ELSE HERAEUS STIFT, JAPANESE GERMAN CTR BERLIN, PHYS TECH BUNDESANSTALT C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER-VERLAG BERLIN PI BERLIN 33 PA HEIDELBERGER PLATZ 3, W-1000 BERLIN 33, GERMANY BN 3-540-55396-7 J9 SPRINGER PROC PHYS PY 1993 VL 64 BP 584 EP 587 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA BA73R UT WOS:A1993BA73R00103 ER PT J AU LINCHUNG, PJ AF LINCHUNG, PJ TI THEORY OF ELECTROMAGNETIC-WAVE PROPAGATION IN SUPERLATTICES WITH OPTICALLY ANISOTROPIC LAYERS SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID PERIODIC DIELECTRIC STRUCTURES; MEDIA; GAP RP LINCHUNG, PJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 0 Z9 0 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 1993 VL 13 IS 1 BP 93 EP 96 DI 10.1006/spmi.1993.1018 PG 4 WC Physics, Condensed Matter SC Physics GA KK137 UT WOS:A1993KK13700018 ER PT J AU RYAN, JC REINECKE, TL AF RYAN, JC REINECKE, TL TI BAND-GAP RENORMALIZATION IN SEMICONDUCTOR QUANTUM-WELLS SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article ID ELECTRON RP RYAN, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 7 Z9 7 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 1993 VL 13 IS 2 BP 177 EP 180 DI 10.1006/spmi.1993.1033 PG 4 WC Physics, Condensed Matter SC Physics GA LA095 UT WOS:A1993LA09500008 ER PT J AU SERMAGE, B DEVEAUD, B SATZKE, K CLEROT, F DUMAS, C ROY, N KATZER, DS MOLLOT, F PLANEL, R BERZ, M OUDAR, JL AF SERMAGE, B DEVEAUD, B SATZKE, K CLEROT, F DUMAS, C ROY, N KATZER, DS MOLLOT, F PLANEL, R BERZ, M OUDAR, JL TI RADIATIVE RECOMBINATION OF FREE-EXCITONS IN GAAS QUANTUM-WELLS SO SUPERLATTICES AND MICROSTRUCTURES LA English DT Article C1 CNET,F-22300 LANNION,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. CNRS,L2M,F-92220 BAGNEUX,FRANCE. RP SERMAGE, B (reprint author), CNET,196 AVE HENRI RAVERA,F-92220 BAGNEUX,FRANCE. RI Oudar, Jean-Louis/G-7130-2012; Deveaud, Benoit/A-4782-2013; Katzer, D. Scott/N-7841-2013; Deveaud, Benoit/N-1947-2014 OI Deveaud, Benoit/0000-0002-9776-6314; Deveaud, Benoit/0000-0002-9776-6314 NR 7 TC 18 Z9 18 U1 0 U2 3 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 1993 VL 13 IS 2 BP 271 EP 273 DI 10.1006/spmi.1993.1054 PG 3 WC Physics, Condensed Matter SC Physics GA LA095 UT WOS:A1993LA09500029 ER PT B AU BLACKBURN, J TIPTON, B TENCH, K AF BLACKBURN, J TIPTON, B TENCH, K BE Berndt, CC Bernecki, TF TI AN INTEGRATED CNC - PLASMA SPRAY WORKCELL FOR MACHINERY COMPONENTS SO THERMAL SPRAY COATINGS: RESEARCH, DESIGN AND APPLICATIONS LA English DT Proceedings Paper CT 5th National Thermal Spray Conference and Exposition on Thermal Spray Technology: Growing to Serve Industry in Surface Protection and Materials Processing (NTSC 93) CY JUN 07-11, 1993 CL ANAHEIM, CA SP ASM INT, AMER WELDING SOC, DEUT VERBAND SCHWEISSTECH E V, JAPAN THERMAL SPRAYING SOC, HIGH TEMP SOC JAPAN, INT THERMAL SPRAY ASSOC C1 USN,CTR SURFACE WARFARE,ANNAPOLIS,MD 21402. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA 9503 KINSMAN RD, MATERIALS PARK, OH 44073 BN 0-87170-470-6 PY 1993 BP 213 EP 224 PG 12 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films SC Materials Science GA BZ93M UT WOS:A1993BZ93M00032 ER PT B AU MORAN, AL MADDEN, CJ REBIS, RE PAYNE, RD MATTESON, MA AF MORAN, AL MADDEN, CJ REBIS, RE PAYNE, RD MATTESON, MA BE Berndt, CC Bernecki, TF TI SPRAY FORMING TECHNOLOGY FOR MILITARY APPLICATIONS SO THERMAL SPRAY COATINGS: RESEARCH, DESIGN AND APPLICATIONS LA English DT Proceedings Paper CT 5th National Thermal Spray Conference and Exposition on Thermal Spray Technology: Growing to Serve Industry in Surface Protection and Materials Processing (NTSC 93) CY JUN 07-11, 1993 CL ANAHEIM, CA SP ASM INT, AMER WELDING SOC, DEUT VERBAND SCHWEISSTECH E V, JAPAN THERMAL SPRAYING SOC, HIGH TEMP SOC JAPAN, INT THERMAL SPRAY ASSOC 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 0-87170-470-6 PY 1993 BP 655 EP 659 PG 5 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films SC Materials Science GA BZ93M UT WOS:A1993BZ93M00102 ER PT B AU IMAM, MA POULOSE, PK RATH, BB AF IMAM, MA POULOSE, PK RATH, BB BE Froes, FH Caplan, IL TI EFFECT OF COLD WORK AND HEAT-TREATMENT IN ALPHA-REGION ON MECHANICAL-PROPERTIES OF TI-15-3 ALLOY SO TITANIUM '92: SCIENCE AND TECHNOLOGY, VOLS 1-3 LA English DT Proceedings Paper CT Symposium on Titanium: Science and technology, at the 7th World Titanium Conference CY JUN 29-JUL 02, 1992 CL SAN DIEGO, CA SP MINERALS MET & MAT SOC, STRUCT MET DIV, TITANIUM COMM C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-222-1 PY 1993 BP 177 EP 184 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA BB20G UT WOS:A1993BB20G00019 ER PT B AU JUDY, RW CAPLAN, IL AF JUDY, RW CAPLAN, IL BE Froes, FH Caplan, IL TI ROLE OF COMPOSITION AND MICROSTRUCTURE IN DYNAMIC AND STATIC FRACTURE OF ALPHA-BETA TITANIUM-ALLOYS SO TITANIUM '92: SCIENCE AND TECHNOLOGY, VOLS 1-3 LA English DT Proceedings Paper CT Symposium on Titanium: Science and technology, at the 7th World Titanium Conference CY JUN 29-JUL 02, 1992 CL SAN DIEGO, CA SP MINERALS MET & MAT SOC, STRUCT MET DIV, TITANIUM COMM C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-222-1 PY 1993 BP 233 EP 240 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA BB20G UT WOS:A1993BB20G00026 ER PT B AU WELLS, ME AF WELLS, ME BE Froes, FH Caplan, IL TI STRENGTHENING MECHANISMS IN UNDERMATCHED TITANIUM WELDS SO TITANIUM '92: SCIENCE AND TECHNOLOGY, VOLS 1-3 LA English DT Proceedings Paper CT Symposium on Titanium: Science and technology, at the 7th World Titanium Conference CY JUN 29-JUL 02, 1992 CL SAN DIEGO, CA SP MINERALS MET & MAT SOC, STRUCT MET DIV, TITANIUM COMM C1 USN,CTR SURFACE WARFARE,DIV CARDEROCK,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-222-1 PY 1993 BP 1787 EP 1794 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA BB20G UT WOS:A1993BB20G00215 ER PT B AU JUDY, RW CAPLAN, IL BOGAR, FD AF JUDY, RW CAPLAN, IL BOGAR, FD BE Froes, FH Caplan, IL TI EFFECTS OF OXYGEN AND IRON ON THE ENVIRONMENTAL AND MECHANICAL-PROPERTIES OF UNALLOYED TITANIUM SO TITANIUM '92: SCIENCE AND TECHNOLOGY, VOLS 1-3 LA English DT Proceedings Paper CT Symposium on Titanium: Science and technology, at the 7th World Titanium Conference CY JUN 29-JUL 02, 1992 CL SAN DIEGO, CA SP MINERALS MET & MAT SOC, STRUCT MET DIV, TITANIUM COMM C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 1 Z9 1 U1 0 U2 1 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-222-1 PY 1993 BP 2073 EP 2080 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA BB20G UT WOS:A1993BB20G00251 ER PT B AU PAO, PS BAYLES, RA GILL, SJ MEYN, DA YODER, GR AF PAO, PS BAYLES, RA GILL, SJ MEYN, DA YODER, GR BE Froes, FH Caplan, IL TI RIPPLE LOAD DEGRADATION IN TITANIUM-ALLOYS SO TITANIUM '92: SCIENCE AND TECHNOLOGY, VOLS 1-3 LA English DT Proceedings Paper CT Symposium on Titanium: Science and technology, at the 7th World Titanium Conference CY JUN 29-JUL 02, 1992 CL SAN DIEGO, CA SP MINERALS MET & MAT SOC, STRUCT MET DIV, TITANIUM COMM C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-222-1 PY 1993 BP 2169 EP 2176 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA BB20G UT WOS:A1993BB20G00264 ER PT B AU OPET, SL PETERS, DF AF OPET, SL PETERS, DF BE Froes, FH Caplan, IL TI BETA-TITANIUM IN THE UNITED-STATES SURFACE NAVY IMPROVED WATER BRAKE SO TITANIUM '92: SCIENCE AND TECHNOLOGY, VOLS 1-3 LA English DT Proceedings Paper CT Symposium on Titanium: Science and technology, at the 7th World Titanium Conference CY JUN 29-JUL 02, 1992 CL SAN DIEGO, CA SP MINERALS MET & MAT SOC, STRUCT MET DIV, TITANIUM COMM C1 USN,CTR AIR WARFARE,DIV AIRCRAFT,LAKEHURST,NJ. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-222-1 PY 1993 BP 2721 EP 2728 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA BB20G UT WOS:A1993BB20G00332 ER PT B AU WELLS, ME SASSE, JA AF WELLS, ME SASSE, JA BE Froes, FH Caplan, IL TI PRODUCTION OF TITANIUM 6AL-4V ELI ELECTRONIC BOTTLES FOR THE CURV-III SUBMERSIBLE SO TITANIUM '92: SCIENCE AND TECHNOLOGY, VOLS 1-3 LA English DT Proceedings Paper CT Symposium on Titanium: Science and technology, at the 7th World Titanium Conference CY JUN 29-JUL 02, 1992 CL SAN DIEGO, CA SP MINERALS MET & MAT SOC, STRUCT MET DIV, TITANIUM COMM C1 USN,CTR SURFACE WARFARE,DIV CARDEROCK,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-222-1 PY 1993 BP 2729 EP 2736 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Materials Science; Metallurgy & Metallurgical Engineering GA BB20G UT WOS:A1993BB20G00333 ER PT J AU KAMMEYER, JW AF KAMMEYER, JW TI A CLASSIFICATION OF THE FINITE EXTENSIONS OF A MULTIDIMENSIONAL BERNOULLI SHIFT SO TRANSACTIONS OF THE AMERICAN MATHEMATICAL SOCIETY LA English DT Article AB The finite extensions of a multidimensional Bernoulli shift are classified completely, up to factor isomorphism, and up to isomorphism. If such an extension is weakly mixing then it must be Bernoulli; otherwise, it has a finite rotation factor, which has a Bernoulli complementary algebra. This result is extended to multidimensional Bernoulli flows and Bernoulli shifts of infinite entropy. RP KAMMEYER, JW (reprint author), USN ACAD,DEPT MATH,572 HOLLOWAY RD,ANNAPOLIS,MD 21402, USA. NR 6 TC 4 Z9 4 U1 0 U2 1 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0002-9947 J9 T AM MATH SOC JI Trans. Am. Math. Soc. PD JAN PY 1993 VL 335 IS 1 BP 443 EP 457 DI 10.2307/2154277 PG 15 WC Mathematics SC Mathematics GA KJ020 UT WOS:A1993KJ02000022 ER PT B AU CERZA, M MEMORY, SB MARTO, PJ AF CERZA, M MEMORY, SB MARTO, PJ BE Lee, JS Chung, SH Kim, KH TI THE INFLUENCE OF POOL CIRCULATION ON NATURAL-CONVECTION AND POOL BOILING OF R113 FROM A VERTICAL ARRAY OF TUBES SO TRANSPORT PHENOMENA IN THERMAL ENGINEERING, VOLS 1 AND 2 LA English DT Proceedings Paper CT 6th International Symposium on Transport Phenomena in Thermal Engineering (ISTP-VI) CY MAY 09-13, 1993 CL SEOUL, SOUTH KOREA SP PACIFIC CTR THERMAL FLUIDS ENGN C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BEGELL HOUSE, INC PI NEW YORK PA 79 MADISON AVE, SUITE 1106, NEW YORK, NY 10016 BN 1-56700-015-0 PY 1993 BP 496 EP 501 PG 6 WC Thermodynamics; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Engineering GA BA70Z UT WOS:A1993BA70Z00080 ER PT B AU ELSBERRY, RL BOHNER, RH AF ELSBERRY, RL BOHNER, RH BE Lighthill, J Holland, G Zheng, ZM Emanuel, K TI 3-COMPONENT DECOMPOSITIONS OF TROPICAL CYCLONE WIND FIELDS - RELATION TO TROPICAL CYCLONE MOTION SO TROPICAL CYCLONE DISASTERS LA English DT Proceedings Paper CT ICSU/WMO International Symposium on Tropical Cyclone Disasters CY OCT 12-16, 1992 CL BEIJING, PEOPLES R CHINA SP INT COUNCIL SCI UNIONS, WORLD METEOROL ORG, WORLD FEDERAT ENGN ORG, UNION ASSOC TECH INT, INT UNION GEODESY & GEOPHYS, SCI COMM OCEANIC RES, INT CTR THEORET PHYS, CHINA ASSOC SCI & TECHNOL, CHINESE SOC THEORET & APPL MECH, CHINESE METEOROL SOC, CHINESE SOC OCEANOG, CHINESE SOC HYDRAUL ENGN, CHINESE ACAD SCI, STATE METEOROL ADM, STATE OCEAN ADM, NATL NAT SCI FDN CHINA, ACAD WATER CONSERVANCY & HYDROELECT POWER, CHINA NATL COMM IDNDR C1 USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PEKING UNIV PRESS PI BEIJING PA HAIDIANQU, BEIJING, PEOPLES R CHINA BN 7-301-02086-4 PY 1993 BP 306 EP 317 PG 12 WC Meteorology & Atmospheric Sciences; Oceanography SC Meteorology & Atmospheric Sciences; Oceanography GA BC86Q UT WOS:A1993BC86Q00028 ER PT B AU MORGAN, MA AF MORGAN, MA BE Bertoni, HL Carin, L Felsen, LB TI ULTRA-WIDE-BAND IMPULSE ELECTROMAGNETIC SCATTERING LABORATORY SO ULTRA-WIDEBAND, SHORT-PULSE ELECTROMAGNETICS LA English DT Proceedings Paper CT 2nd WRI International Conference on Ultra-Wideband Short-Pulse Electromagnetics CY OCT 08-10, 1992 CL POLYTECH UNIV, BROOKLYN, NY SP USAF, OFF SCI RES, USAF, SYST COMMAND, ROME LAB HO POLYTECH UNIV C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 BN 0-306-44530-1 PY 1993 BP 75 EP 82 PG 8 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BZ51H UT WOS:A1993BZ51H00008 ER PT B AU GAUNAURD, GC STRIFORS, HC ABRAHAMSSON, S BRUSMARK, B AF GAUNAURD, GC STRIFORS, HC ABRAHAMSSON, S BRUSMARK, B BE Bertoni, HL Carin, L Felsen, LB TI SCATTERING OF SHORT EM-PULSES BY SIMPLE AND COMPLEX TARGETS USING IMPULSE RADAR SO ULTRA-WIDEBAND, SHORT-PULSE ELECTROMAGNETICS LA English DT Proceedings Paper CT 2nd WRI International Conference on Ultra-Wideband Short-Pulse Electromagnetics CY OCT 08-10, 1992 CL POLYTECH UNIV, BROOKLYN, NY SP USAF, OFF SCI RES, USAF, SYST COMMAND, ROME LAB HO POLYTECH UNIV C1 USN,CTR SURFACE WARFARE,RES DEPT CODE R-42,SILVER SPRING,MD 20903. NR 0 TC 6 Z9 6 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 BN 0-306-44530-1 PY 1993 BP 437 EP 444 PG 8 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA BZ51H UT WOS:A1993BZ51H00049 ER PT B AU MADIGOSKY, WM FIORITO, RB AF MADIGOSKY, WM FIORITO, RB GP ULTRASONICS TI DYNAMIC HARDNESS TESTER AND CURE METER SO ULTRASONICS INTERNATIONAL 93 - CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT Ultrasonics International Conference CY JUL 06-08, 1993 CL VIENNA, AUSTRIA SP ULTRASONICS DE DYNAMIC TESTING; HARDNESS C1 NSWC,WOD,SILVER SPRING,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN PI OXFORD PA LINACRE HOUSE, JORDAN HILL, OXFORD, OXON, ENGLAND OX2 8DP BN 0-750618-77-9 PY 1993 BP 281 EP 285 PG 5 WC Acoustics SC Acoustics GA BA27D UT WOS:A1993BA27D00065 ER PT J AU FLETCHER, BE AF FLETCHER, BE GP MARINE TECHNOLOGY SOC TI CONTINUED EFFORTS ON THE UNDERWATER SECURITY VEHICLE SO UNDERWATER INTERVENTION '93 LA English DT Proceedings Paper CT Underwater Intervention 1993 Conference: Man and Machine Underwater CY JAN 18-21, 1993 CL NEW ORLEANS, LA SP MARINE TECHNOL, ROV COMM, ASSOC DIVING CONTRACTORS C1 USN COMMAND,CONTROL & OCEAN SURVEILLANCE CTR RES,DIV DEV TEST & EVALUAT,SAN DIEGO,CA 92152. 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 PY 1993 BP 8 EP 14 PG 7 WC Engineering, Marine SC Engineering GA BA12P UT WOS:A1993BA12P00002 ER PT J AU OSBORNE, PD AF OSBORNE, PD GP MARINE TECHNOLOGY SOC TI PASSIVE AND INVERTED LONG-BASE-LINE TRACKING TECHNIQUES FOR FREE SWIMMING VEHICLES SO UNDERWATER INTERVENTION '93 LA English DT Proceedings Paper CT Underwater Intervention 1993 Conference: Man and Machine Underwater CY JAN 18-21, 1993 CL NEW ORLEANS, LA SP MARINE TECHNOL, ROV COMM, ASSOC DIVING CONTRACTORS C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,SAN DIEGO,CA 92152. 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 PY 1993 BP 15 EP 15 PG 1 WC Engineering, Marine SC Engineering GA BA12P UT WOS:A1993BA12P00003 ER PT J AU NUCKOLS, ML AF NUCKOLS, ML GP MARINE TECHNOLOGY SOC TI PROJECT SEA-GOAT 360 AN EXERCISE IN ROV DESIGN SO UNDERWATER INTERVENTION '93 LA English DT Proceedings Paper CT Underwater Intervention 1993 Conference: Man and Machine Underwater CY JAN 18-21, 1993 CL NEW ORLEANS, LA SP MARINE TECHNOL, ROV COMM, ASSOC DIVING CONTRACTORS 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 PY 1993 BP 79 EP 84 PG 6 WC Engineering, Marine SC Engineering GA BA12P UT WOS:A1993BA12P00019 ER PT J AU CLARKE, JR AF CLARKE, JR GP MARINE TECHNOLOGY SOC TI DESIGN GOALS FOR UNDERWATER BREATHING APPARATUS SO UNDERWATER INTERVENTION '93 LA English DT Proceedings Paper CT Underwater Intervention 1993 Conference: Man and Machine Underwater CY JAN 18-21, 1993 CL NEW ORLEANS, LA SP MARINE TECHNOL, ROV COMM, ASSOC DIVING CONTRACTORS C1 USN,EXPTL DIVING UNIT,PANAMA CITY,FL 32407. 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 PY 1993 BP 109 EP 109 PG 1 WC Engineering, Marine SC Engineering GA BA12P UT WOS:A1993BA12P00024 ER PT J AU WALTON, J COOKE, M UHRICH, R AF WALTON, J COOKE, M UHRICH, R GP MARINE TECHNOLOGY SOC TI ADVANCED UNMANNED SEARCH SYSTEM SO UNDERWATER INTERVENTION '93 LA English DT Proceedings Paper CT Underwater Intervention 1993 Conference: Man and Machine Underwater CY JAN 18-21, 1993 CL NEW ORLEANS, LA SP MARINE TECHNOL, ROV COMM, ASSOC DIVING CONTRACTORS C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,RDT&E DIV,NRAD,SAN DIEGO,CA 92152. 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 PY 1993 BP 243 EP 250 PG 8 WC Engineering, Marine SC Engineering GA BA12P UT WOS:A1993BA12P00044 ER PT S AU MAURO, JM GOLDEN, JP ANDERSON, GP OGERT, RA WIJESURIYA, D SHRIVERLAKE, LC LIGLER, FS AF MAURO, JM GOLDEN, JP ANDERSON, GP OGERT, RA WIJESURIYA, D SHRIVERLAKE, LC LIGLER, FS BE Guilbault, GG Mascini, M TI PROGRESS IN FIBEROPTIC BASED BIOSENSORS AT THE UNITED-STATES-NAVAL-RESEARCH-LABORATORY SO USES OF IMMOBILIZED BIOLOGICAL COMPOUNDS SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Uses of Immobilized Biological Compounds CY MAY 09-14, 1993 CL BRIXEN, ITALY SP NATO 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 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-2529-X J9 NATO ADV SCI INST SE PY 1993 VL 252 BP 351 EP 357 PG 7 WC Biochemistry & Molecular Biology; Biophysics; Chemistry, Multidisciplinary SC Biochemistry & Molecular Biology; Biophysics; Chemistry GA BA36D UT WOS:A1993BA36D00033 ER PT B AU SZU, HH TELFER, BA KIANG, RK AF SZU, HH TELFER, BA KIANG, RK GP INT NEURAL NETWORK SOC TI NEURAL-NETWORK CLASSIFICATION OF MULTISPECTRAL DATA WITH CONTEXTUAL INFORMATION SO WCNN'93 - PORTLAND, WORLD CONGRESS ON NEURAL NETWORKS, VOL I LA English DT Proceedings Paper CT World Congress on Neural Networks (WCNN 93, Portland) CY JUL 11-15, 1993 CL PORTLAND, OR SP INT NEURAL NETWORK SOC C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 1 U2 1 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1497-3 PY 1993 BP 117 EP 121 PG 5 WC Computer Science, Artificial Intelligence; Neurosciences SC Computer Science; Neurosciences & Neurology GA BA45U UT WOS:A1993BA45U00029 ER PT B AU KIM, MW AF KIM, MW GP INT NEURAL NETWORK SOC TI HANDWRITTEN DIGIT RECOGNITION USING GRAM-CHARLIER AND GENERALIZED PROBABILISTIC NEURAL NETWORKS SO WCNN'93 - PORTLAND, WORLD CONGRESS ON NEURAL NETWORKS, VOL II LA English DT Proceedings Paper CT World Congress on Neural Networks (WCNN 93, Portland) CY JUL 11-15, 1993 CL PORTLAND, OR SP INT NEURAL NETWORK SOC C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1497-3 PY 1993 BP 305 EP 308 PG 4 WC Computer Science, Artificial Intelligence; Neurosciences SC Computer Science; Neurosciences & Neurology GA BA45V UT WOS:A1993BA45V00067 ER PT B AU COLLINS, DJ AF COLLINS, DJ GP INT NEURAL NETWORK SOC TI IDENTIFICATION AND CONTROL OF NONLINEAR TIME-VARYING DYNAMICAL-SYSTEMS USING ARTIFICIAL NEURAL NETWORKS SO WCNN'93 - PORTLAND, WORLD CONGRESS ON NEURAL NETWORKS, VOL III LA English DT Proceedings Paper CT World Congress on Neural Networks (WCNN 93, Portland) CY JUL 11-15, 1993 CL PORTLAND, OR SP INT NEURAL NETWORK SOC C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1497-3 PY 1993 BP 245 EP 248 PG 4 WC Computer Science, Artificial Intelligence; Neurosciences SC Computer Science; Neurosciences & Neurology GA BA45W UT WOS:A1993BA45W00055 ER PT B AU TELFER, BA SZU, HH AF TELFER, BA SZU, HH GP INT NEURAL NETWORK SOC TI MINIMIZING NEURAL-NETWORK COMPLEXITY FOR PATTERN-RECOGNITION WITH MINIMUM-MISCLASSIFICATION-ERROR ENERGY FUNCTIONS SO WCNN'93 - PORTLAND, WORLD CONGRESS ON NEURAL NETWORKS, VOL IV LA English DT Proceedings Paper CT World Congress on Neural Networks (WCNN 93, Portland) CY JUL 11-15, 1993 CL PORTLAND, OR SP INT NEURAL NETWORK SOC C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1497-3 PY 1993 BP 14 EP 19 PG 6 WC Computer Science, Artificial Intelligence; Neurosciences; Physics, Mathematical SC Computer Science; Neurosciences & Neurology; Physics GA BA45X UT WOS:A1993BA45X00004 ER PT B AU KAMGARPARSI, B KAMGAPARSI, B AF KAMGARPARSI, B KAMGAPARSI, B GP INT NEURAL NETWORK SOC TI A REVISED CLUSTERING TECHNIQUE USING A HOPFIELD NETWORK SO WCNN'93 - PORTLAND, WORLD CONGRESS ON NEURAL NETWORKS, VOL IV LA English DT Proceedings Paper CT World Congress on Neural Networks (WCNN 93, Portland) CY JUL 11-15, 1993 CL PORTLAND, OR SP INT NEURAL NETWORK SOC C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1497-3 PY 1993 BP 24 EP 27 PG 4 WC Computer Science, Artificial Intelligence; Neurosciences; Physics, Mathematical SC Computer Science; Neurosciences & Neurology; Physics GA BA45X UT WOS:A1993BA45X00006 ER PT B AU BACHMANN, CM LUONG, D AF BACHMANN, CM LUONG, D GP INT NEURAL NETWORK SOC TI EXTENSIONS OF UNSUPERVISED BCM PROJECTION PURSUIT - RECURRENT AND DIFFERENTIAL MODELS FOR TIME-DEPENDENT CLASSIFICATION SO WCNN'93 - PORTLAND, WORLD CONGRESS ON NEURAL NETWORKS, VOL IV LA English DT Proceedings Paper CT World Congress on Neural Networks (WCNN 93, Portland) CY JUL 11-15, 1993 CL PORTLAND, OR SP INT NEURAL NETWORK SOC C1 USN,RES LAB,DIV RADAR,AIRBORNE RADAR BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1497-3 PY 1993 BP 633 EP 638 PG 6 WC Computer Science, Artificial Intelligence; Neurosciences; Physics, Mathematical SC Computer Science; Neurosciences & Neurology; Physics GA BA45X UT WOS:A1993BA45X00137 ER PT B AU SZU, HH LU, F LANDA, JS AF SZU, HH LU, F LANDA, JS GP INT NEURAL NETWORK SOC TI ARTIFICIAL NEURAL NETWORKS APPROACH FOR BISTABLE REVERSIBLE FIGURES SO WCNN'93 - PORTLAND, WORLD CONGRESS ON NEURAL NETWORKS, VOL IV LA English DT Proceedings Paper CT World Congress on Neural Networks (WCNN 93, Portland) CY JUL 11-15, 1993 CL PORTLAND, OR SP INT NEURAL NETWORK SOC DE REVERSIBLE FIGURES; BISTABLE; NEURAL NETWORKS; PHASE TRANSITION C1 USN,CTR SURFACE,DAHLGREN DIV,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1497-3 PY 1993 BP 812 EP 816 PG 5 WC Computer Science, Artificial Intelligence; Neurosciences; Physics, Mathematical SC Computer Science; Neurosciences & Neurology; Physics GA BA45X UT WOS:A1993BA45X00173 ER PT J AU SEMPLE, SJ PATTERSON, TL TEMOSHOK, LR MCCUTCHAN, JA STRAITSTROSTER, KA CHANDLER, JL GRANT, I GRANT, I ATKINSON, JH VELIN, RA OLDFIELD, EC CHANDLER, JL WALLACE, MR MALONE, J MCCUTCHAN, JA SPECTOR, SA THAL, L HEATON, RK HESSELINK, J JERNIGAN, T WILEY, CA OLSHEN, R ABRAMSON, I BUTTERS, N DUPONT, R ZISOOK, S JESTE, D SIEBURG, H WEINRICH, JD AF SEMPLE, SJ PATTERSON, TL TEMOSHOK, LR MCCUTCHAN, JA STRAITSTROSTER, KA CHANDLER, JL GRANT, I GRANT, I ATKINSON, JH VELIN, RA OLDFIELD, EC CHANDLER, JL WALLACE, MR MALONE, J MCCUTCHAN, JA SPECTOR, SA THAL, L HEATON, RK HESSELINK, J JERNIGAN, T WILEY, CA OLSHEN, R ABRAMSON, I BUTTERS, N DUPONT, R ZISOOK, S JESTE, D SIEBURG, H WEINRICH, JD TI IDENTIFICATION OF PSYCHOBIOLOGICAL STRESSORS AMONG HIV-POSITIVE WOMEN SO WOMEN & HEALTH LA English DT Article ID HUMAN-IMMUNODEFICIENCY-VIRUS; IMMUNE-DEFICIENCY SYNDROME; NATURAL-HISTORY; HUMAN PAPILLOMAVIRUS; AIDS; INFECTION; ISSUES; CHILDREN; CARE AB This research describes major stressors in the lives of women who have been infected with the human immunodeficiency virus (HIV). Thirty-one HIV antibody positive (HIV+) women infected primarily through heterosexual contact participated in a two hour semi-structured interview detailing the circumstances, context, and consequences of all stressful life events and difficulties experienced within the preceding six months. Qualitative methods of data analyses were utilized (Miles & Huberman, 1984). HIV-related life events and difficulties were classified into primary and secondary stressors based on the stress process model (Pearlin et al., 1981). Problems arising directly from one's seropositivity were defined as primary stressors. Stressful life events and difficulties occurring in other role areas were defined as secondary stressors. Six categories of HIV-related stressors were identified and quantified. Primary stressors were health-related, and included both gynecological problems (eg., amenorrhea) and general symptoms of HIV infection (eg., fatigue). Secondary stressors related to child and family (e.g., future guardianship of children), marital/partner relations (e.g., disclosure of HIV+ status), occupation (e.g., arranging time-off for medical appointments), economic problems (e.g., insurance ''hassles''), and social network events (e.g., death of friends from AIDS). This research indicates that HIV-positive women are exposed to multiple stressors; some may be viewed as unique to women, whereas others may be considered common to both sexes. Identification of stressors has implications for the design of medical and psychiatric interventions for women. C1 HENRY M JACKSON FDN ADVANCEMENT MIL MED,ROCKVILLE,MD. MIL MED CONSORTIUM APPL RETROVIRAL RES,ROCKVILLE,MD. SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182. VET ADM MED CTR,SAN DIEGO,CA 92161. NAVAL HOSP,SAN DIEGO,CA. RP SEMPLE, SJ (reprint author), UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92103, USA. FU NIMH NIH HHS [5 R01 MH43298, 5 R29 MH45688, NIMH 5 P50 MH45294] NR 33 TC 68 Z9 68 U1 0 U2 1 PU HAWORTH PRESS INC PI BINGHAMTON PA 10 ALICE ST, BINGHAMTON, NY 13904-1580 SN 0363-0242 J9 WOMEN HEALTH JI Women Health PY 1993 VL 20 IS 4 BP 15 EP 36 DI 10.1300/J013v20n04_02 PG 22 WC Public, Environmental & Occupational Health; Women's Studies SC Public, Environmental & Occupational Health; Women's Studies GA NJ246 UT WOS:A1993NJ24600002 PM 8171874 ER PT J AU COLLINS, DM AF COLLINS, DM TI ENTROPY MAXIMIZATIONS ON ELECTRON-DENSITY SO ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES LA English DT Article DE CHARGE DENSITY; CORRELATION ENERGY; DENSITY MATRIX; ENTROPY MAXIMIZATION; HOHENBERG-KOHN THEOREM ID ABINITIO PHASE DETERMINATION; MAXIMUM-ENTROPY; MULTISOLUTION METHOD; LIKELIHOOD; PROTEIN AB Incomplete and imperfect data characterize the problem of constructing electron density representations from experimental information. One fundamental concern is identification of the proper protocol for including new information at any stage of a density reconstruction. An axiomatic approach developed in other fields specifies entropy maximization as the desired protocol. In particular, if new data are used to modify a prior charge density distribution without adding extraneous prejudice, the new distribution must both agree with all the data, new and old, and be a function of maximum relative entropy. The functional form of relative entropy is sigma = -rho ln (rho/tau), where Q and tau respectively refer to new and prior distributions normalized to a common scale. Entropy maximization has been used to deal with certain aspects of the phase problem of X-ray diffraction. Varying degrees of success have marked the work which may be roughly assigned to categories as direct methods, data reduction and analysis, and image enhancement. Much of the work has been expressed in probabilistic language, although image enhancement has been somewhat more physical or geometric in description. Whatever the language, entropy maximization is a specific and deterministic functional manipulation. A recent advance has been the description of an algorithm which, quite deterministically, adjusts a prior positive charge density distribution to agree exactly with a specified subset of structure-factor moduli by a constrained entropy maximization. Entropy on an N-representable one-particle density matrix is well defined. The entropy is the expected form, and it is a simple function of the one-matrix eigenvalues which all must be non-negative. Relationships between the entropy functional and certain properties of a one-matrix are discussed, as well as a conjecture concerning the physical interpretation of entropy. Throughout this work reference is made to informational entropy, not the entropy of thermodynamics. C1 GEOCENTERS INC, FT WASHINGTON, MD 20744 USA. RP USN RES LAB 6030, WASHINGTON, DC 20375 USA. NR 31 TC 54 Z9 54 U1 0 U2 3 PU WALTER DE GRUYTER GMBH PI BERLIN PA GENTHINER STRASSE 13, D-10785 BERLIN, GERMANY SN 0932-0784 EI 1865-7109 J9 Z NATURFORSCH A JI Z. Naturfors. Sect. A-J. Phys. Sci. PD JAN-FEB PY 1993 VL 48 IS 1-2 BP 68 EP 74 PG 7 WC Chemistry, Physical; Physics, Multidisciplinary SC Chemistry; Physics GA KW966 UT WOS:A1993KW96600015 ER PT J AU TWIGG, ME ZVANUT, ME STAHLBUSH, R GODBEY, DJ JENKINS, WC AF TWIGG, ME ZVANUT, ME STAHLBUSH, R GODBEY, DJ JENKINS, WC TI DISTRIBUTION OF GE IN 0+ IMPLANTED SILICON SO APPLIED PHYSICS LETTERS LA English DT Article ID BURIED SIO2 LAYER; BIPOLAR-TRANSISTORS; OXIDATION; KINETICS; SIGE AB We have studied 50 nm Si0.8Ge0.2 buried layers and 800 nm Si0.9Ge0.1 layers, grown by molecular beam epitaxy, which were implanted with 200 keV oxygen O+ ions to a dose of 1.8 X 10(18)/cm2. This implantation procedure is similar to that used in the formation of SIMOX (separation by implantation of oxygen), although it was not followed by the usual high temperature anneal. Because the initial implantation profile extends as far as 600 nm below the Si surface, the 50 nm Si0.8Ge0.2 layers were embedded in Si at depths of 600, 500, 400, and 300 nm from the Si surface. The effects of Ge incorporation could then be studied as a function of distance from the surface and position within the implantation profile. Using a scanning transmission electron microscope equipped with energy dispersive x-ray spectroscopy, we examined cross-sectional specimens for the distribution of the Ge in and around the implanted oxide layer. We found that the Ge tended to be excluded from the oxide in all the samples with the 50 nm buried layer. For the case where the oxide was implanted into the midst of an 800 nm layer, the Ge remained in the oxide. RP TWIGG, ME (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 21 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 28 PY 1992 VL 61 IS 26 BP 3142 EP 3144 DI 10.1063/1.107987 PG 3 WC Physics, Applied SC Physics GA KD924 UT WOS:A1992KD92400023 ER PT J AU JUSTUS, BL TONUCCI, RJ BERRY, AD AF JUSTUS, BL TONUCCI, RJ BERRY, AD TI NONLINEAR OPTICAL-PROPERTIES OF QUANTUM-CONFINED GAAS NANOCRYSTALS IN VYCOR GLASS SO APPLIED PHYSICS LETTERS LA English DT Article ID SIZED SEMICONDUCTOR CLUSTERS; MICROCRYSTALLITES; DOTS AB Quantum-confined nanocrystallites of GaAs are fabricated in porous Vycor glass and the bound electronic nonlinear refractive index, the two-photon absorption coefficient, and the refraction from carriers generated by two-photon absorption are simultaneously determined using the Z-scan method and compared to those of bulk GaAs. The measured nonlinear refractive index is an order of magnitude larger than that of bulk GaAs at 1060 nm. RP JUSTUS, BL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 76 Z9 78 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 28 PY 1992 VL 61 IS 26 BP 3151 EP 3153 DI 10.1063/1.107991 PG 3 WC Physics, Applied SC Physics GA KD924 UT WOS:A1992KD92400026 ER PT J AU RAJAGOPAL, AK GUPTA, V AF RAJAGOPAL, AK GUPTA, V TI UNCERTAINTY PRINCIPLE, SQUEEZING, AND QUANTUM GROUPS SO MODERN PHYSICS LETTERS A LA English DT Article AB It is shown that the complete form of the Heisenberg Uncertainty Relation (HUR) must be employed in introducing the concepts of squeezing and coherent state in q-quantum mechanics. An important feature of this form of the HUR is that it is invariant under unitary transformation of the operators appearing in it and consequences of this are pointed out. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-7323 J9 MOD PHYS LETT A JI Mod. Phys. Lett. A PD DEC 28 PY 1992 VL 7 IS 40 BP 3759 EP 3764 DI 10.1142/S0217732392003177 PG 6 WC Physics, Nuclear; Physics, Particles & Fields; Physics, Mathematical SC Physics GA KK251 UT WOS:A1992KK25100005 ER PT J AU KRATZKE, RA OTTERSON, GA LIN, AY SHIMIZU, E ALEXANDROVA, N ZAJAC-KAYE, M HOROWITZ, JM KAYE, FJ AF KRATZKE, RA OTTERSON, GA LIN, AY SHIMIZU, E ALEXANDROVA, N ZAJAC-KAYE, M HOROWITZ, JM KAYE, FJ TI FUNCTIONAL-ANALYSIS AT THE CYS(706) RESIDUE OF THE RETINOBLASTOMA PROTEIN SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID LARGE-T-ANTIGEN; TUMOR SUPPRESSOR GENES; CARCINOMA CELL-LINES; SUSCEPTIBILITY GENE; TRANSCRIPTION FACTOR; LEUCINE REPEATS; RB PROTEIN; PRODUCT; BINDING; EXPRESSION AB A missense mutation at cysteine 706, resulting in a retinoblastoma (RB) protein defective in phosphorylation and oncoprotein binding, has been isolated from a human tumor cell line. Since this residue is conserved in murine RB and in the related p107 protein, we studied the activity of in vitro mutants flanking this position. These experiments demonstrated that the thiol atom at codon 706 does not possess intrinsic functional activity as small polar or nonpolar residues could substitute at either codons 706 or 707, while bulkier R-group changes in these positions interfered with in vitro oncoprotein binding or in vivo protein phosphorylation. A series of missense mutants in an adjacent leucine repeat domain also demonstrated a loss of oncoprotein binding that was proportional to the magnitude of amino acid substitutions. To determine whether the cysteine 706 --> phenylalanine RB mutant retained any protein binding activity, we examined its ability to precipitate MYC, which was recently identified as a potential RB-associated protein. These experiments demonstrated that the mutant RB product is capable of binding in vitro to c-myc and L-myc proteins with comparable affinity as wild-type RB. These findings raise questions about the functional role of the RB:MYC interactions and emphasize important differences in the binding patterns between MYC and the other RB-associated proteins. C1 NCI, NAVY ONCOL BRANCH, BETHESDA, MD 20889 USA. NCI, MED BRANCH, BETHESDA, MD 20889 USA. DUKE UNIV, MED CTR, CELL GROWTH REGULAT & ONCOGENESIS SECT, DURHAM, NC 27710 USA. DUKE UNIV, MED CTR, DEPT MICROBIOL & IMMUNOL, DURHAM, NC 27710 USA. RP KAYE, FJ (reprint author), USN HOSP, NCI, NAVY MED ONCOL BRANCH, BLDG 8, RM 5101, BETHESDA, MD 20889 USA. RI kaye, frederic/E-2437-2011 FU NCI NIH HHS [CA53248] NR 50 TC 35 Z9 35 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD DEC 25 PY 1992 VL 267 IS 36 BP 25998 EP 26003 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KD073 UT WOS:A1992KD07300062 PM 1334491 ER PT J AU GAUNAURD, GC AF GAUNAURD, GC TI TRANSIENT AND STEADY-STATE SCATTERING OF ACOUSTIC-WAVES FROM ELASTIC OBJECTS IN FLUIDS AND OF ELASTIC-WAVES FROM INCLUSIONS IN SOLID MEDIA - DIRECT AND INVERSE SCATTERING ASPECTS SO JOURNAL OF SOUND AND VIBRATION LA English DT Article; Proceedings Paper CT SPECIAL SESSION ON WAVE PROPAGATION IN ELASTIC MEDIA, AT THE 121ST MEETING OF THE ACOUSTICAL SOC OF AMERICA CY APR 29-MAY 03, 1991 CL BALTIMORE, MD SP ACOUST SOC AMER ID SPHERICAL-SHELLS; SOUND SCATTERING; RESONANCE THEORY; CREEPING WAVES; LAMB; UNDERWATER RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,RES DEPT,CODE R-14,WHITE OAK,SILVER SPRING,MD 20903, USA. NR 28 TC 2 Z9 2 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-460X J9 J SOUND VIB JI J. Sound Vibr. PD DEC 22 PY 1992 VL 159 IS 3 BP 421 EP 440 DI 10.1016/0022-460X(92)90751-I PG 20 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA KE314 UT WOS:A1992KE31400003 ER PT J AU KO, SH AF KO, SH TI APPLICATION OF ELASTOMERIC MATERIAL TO THE REDUCTION OF TURBULENT BOUNDARY-LAYER PRESSURE-FLUCTUATIONS 3-DIMENSIONAL ANALYSIS SO JOURNAL OF SOUND AND VIBRATION LA English DT Article; Proceedings Paper CT SPECIAL SESSION ON WAVE PROPAGATION IN ELASTIC MEDIA, AT THE 121ST MEETING OF THE ACOUSTICAL SOC OF AMERICA CY APR 29-MAY 03, 1991 CL BALTIMORE, MD SP ACOUST SOC AMER RP KO, SH (reprint author), USN,UNDERSEA WARFARE CTR DETACHMENT,NEW LONDON,CT 06320, USA. NR 9 TC 1 Z9 3 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-460X J9 J SOUND VIB JI J. Sound Vibr. PD DEC 22 PY 1992 VL 159 IS 3 BP 469 EP 481 DI 10.1016/0022-460X(92)90753-K PG 13 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA KE314 UT WOS:A1992KE31400005 ER PT J AU SAKS, NS RENDELL, RW AF SAKS, NS RENDELL, RW TI TIME-DEPENDENCE OF THE INTERFACE TRAP BUILDUP IN DEUTERIUM-ANNEALED OXIDES AFTER IRRADIATION SO APPLIED PHYSICS LETTERS LA English DT Article ID MOS DEVICES; HYDROGEN; ELECTRONS; SIO2; INJECTION; STATES; HOLES AB The rate of interface trap N(it) build-up after irradiation has been studied in metal-oxide semiconductor oxides which were annealed in either deuterium or hydrogen. The build-up rate is found to be substantially retarded in the deuterium-annealed oxide. This result demonstrates conclusively that the N(it) build-up rate is determined by the rate of H+ (D+) drift through the oxide to the Si-SiO2 interface. RP SAKS, NS (reprint author), USN,RES LAB,CODE 6813,WASHINGTON,DC 20375, USA. NR 27 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 21 PY 1992 VL 61 IS 25 BP 3014 EP 3016 DI 10.1063/1.108479 PG 3 WC Physics, Applied SC Physics GA KC860 UT WOS:A1992KC86000022 ER PT J AU STARKWEATHER, HW AVAKIAN, P FONTANELLA, JJ WINTERSGILL, MC AF STARKWEATHER, HW AVAKIAN, P FONTANELLA, JJ WINTERSGILL, MC TI EFFECT OF PRESSURE ON THE DIELECTRIC GAMMA-RELAXATION IN POLY(TETRAFLUOROETHYLENE) AND FEP SO MACROMOLECULES LA English DT Article AB Dielectric measurements have been made on PTFE at temperatures from 188 to 237 K and pressures up to 3000 atm. With increasing pressure, internal motions are restricted due to decreases in volume, and the gamma-relaxation shifts to higher temperatures and lower frequencies with an increasing Arrhenius activation energy. The activation volume decreases with increasing temperature but is larger than for the analogous relaxation in polyethylene. The distribution of Helmholtz activation free energies is independent of pressure. In FEP, the copolymer of tetrafluoroethylene and hexafluoropropylene, the loss peak is thought to be a composite of the gamma- and beta-relaxations. C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP STARKWEATHER, HW (reprint author), DUPONT CO,CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880, USA. NR 14 TC 11 Z9 11 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD DEC 21 PY 1992 VL 25 IS 26 BP 7145 EP 7149 DI 10.1021/ma00052a011 PG 5 WC Polymer Science SC Polymer Science GA KE277 UT WOS:A1992KE27700011 ER PT J AU GRACIK, TD LONG, GL AF GRACIK, TD LONG, GL TI PREDICTION OF THERMOPLASTIC FLAMMABILITY BY THERMOGRAVIMETRY SO THERMOCHIMICA ACTA LA English DT Article; Proceedings Paper CT 20TH CONF OF THE NORTH AMERICAN THERMAL ANALYSIS SOC : NEW DIRECTIONS IN MATERIAL CHARACTERIZATION BY THERMAL ANALYSIS CY SEP 20-26, 1991 CL MINNEAPOLIS, MN SP N AMER THERMAL ANAL SOC AB The novel aspect of this work is that it examines relationship between the amount of thermogravimetry (TG) char measured at various sample degradation temperatures and the limiting oxygen index (LOI) at elevated sample temperatures. Analysis of experimental results indicates the amount of TG char is directly proportional to the LOI value of most thermoplastics evaluated. The higher the amount of TG char of a thermoplastic material, the higher will be its LOI value, i.e. lower flammability. The LOI value decreases, however, with higher sample temperatures. Statistical relationships for predicting LOI values of thermoplastics at various temperatures are provided. RP GRACIK, TD (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,SURVIVAB & FIRE RES LAB,POB 418,ARNOLD,MD 21012, USA. NR 8 TC 16 Z9 16 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 21 PY 1992 VL 212 BP 163 EP 170 DI 10.1016/0040-6031(92)80231-K PG 8 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA KJ946 UT WOS:A1992KJ94600019 ER PT J AU SCHULTZ, KI FISHER, S AF SCHULTZ, KI FISHER, S TI GROUND-BASED LASER-RADAR MEASUREMENTS OF SATELLITE VIBRATIONS SO APPLIED OPTICS LA English DT Article DE LASER RADAR; LADAR; INFRARED LADAR; DOPPLER VIBRATION SIGNATURES; LADAR SATELLITE SIGNATURES AB Vibration signatures from the low-power atmospheric compensation (LACE) satellite are obtained by using the MIT Lincoln Laboratory Firepond coherent CO2 laser radar facility located in Westford, Mass. The LACE satellite is equipped with IR germanium retroreflectors on deployable/retractable booms to enhance ground-based IR laser radar measurements of on-orbit boom vibrations. Analysis of pulsed cw laser radar measurements of the satellite during and subsequent to boom retraction indicates the presence of a complex time-varying model structure. The observed vibration spectra include vibration modes not previously predicted. These data represent the first observations of satellite vibration modes from a ground-based laser radar. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP SCHULTZ, KI (reprint author), MIT, LINCOLN LAB, LEXINGTON, MA 02173 USA. NR 5 TC 22 Z9 24 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD DEC 20 PY 1992 VL 31 IS 36 BP 7690 EP 7695 PG 6 WC Optics SC Optics GA KF520 UT WOS:A1992KF52000025 PM 20802650 ER PT J AU MARISKA, JT DOWDY, JF AF MARISKA, JT DOWDY, JF TI SOLAR DOPPLER-SHIFT MEASUREMENTS IN THE NE-VII 465-ANGSTROM EMISSION-LINE SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, TRANSITION REGION; SUN, UV RADIATION ID TRANSITION REGION; QUIET SUN AB Using a Dopplergram obtained with the Naval Research Laboratory extreme ultraviolet spectrograph on Skylab, we have searched for Doppler shifts in the Ne VII 465 angstrom emission line, which is formed at a temperature of approximately 5 x 10(5) K. In the quiet Sun we find no measurable average Doppler shift to a measurement accuracy of +/- 18 km s-1. Small regions of the quite Sun do, however, display measurable Doppler shifts. In active regions, we measure Doppler shifts indicating downflow velocities of up to 70 km s-1. C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. RP MARISKA, JT (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7671,WASHINGTON,DC 20375, USA. NR 11 TC 14 Z9 14 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 1992 VL 401 IS 2 BP 754 EP 758 DI 10.1086/172102 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD149 UT WOS:A1992KD14900029 ER PT J AU OLSON, PE KENNEDY, CA MORTE, PD AF OLSON, PE KENNEDY, CA MORTE, PD TI PARESTHESIAS AND MEFLOQUINE PROPHYLAXIS SO ANNALS OF INTERNAL MEDICINE LA English DT Letter RP OLSON, PE (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 5 TC 5 Z9 5 U1 0 U2 0 PU AMER COLL PHYSICIANS PI PHILADELPHIA PA INDEPENDENCE MALL WEST 6TH AND RACE ST, PHILADELPHIA, PA 19106-1572 SN 0003-4819 J9 ANN INTERN MED JI Ann. Intern. Med. PD DEC 15 PY 1992 VL 117 IS 12 BP 1058 EP 1059 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA KB980 UT WOS:A1992KB98000019 PM 1443980 ER PT J AU JOHNSTON, PG RONDINONE, CM VOELLER, D ALLEGRA, CJ AF JOHNSTON, PG RONDINONE, CM VOELLER, D ALLEGRA, CJ TI IDENTIFICATION OF A PROTEIN FACTOR SECRETED BY 3T3-L1 PREADIPOCYTES INHIBITORY FOR THE HUMAN MCF-7 BREAST-CANCER CELL-LINE SO CANCER RESEARCH LA English DT Article ID MAMMARY EPITHELIAL-CELLS; TRANSFORMING GROWTH-FACTOR; FACTOR-BETA; MOUSE; CULTURE; FIBROBLASTS; EXPRESSION; CARCINOMA; GLAND; MORPHOGENESIS AB The 3T3-L1 cell line is a preadipocyte cell line derived from the Swiss 3T3 mouse fibroblast cell line. We have compared the effect of 3T3-L1 conditioned medium (3T3-L1 CM) and Swiss 3T3 conditioned medium (3T3 CM) on the growth of normal mouse mammary cells (NMMG) and the human MCF-7 breast carcinoma cell line. 3T3 CM increased the growth of both NMMG and MCF-7 cells by 19 +/- 2% (SD) and 24 +/- 3%, respectively, and increased thymidine incorporation by 74 +/- 4% and 104 +/- 8%, respectively. Conditioned medium from 3T3-L1 cells stimulated the growth of NMMG cells by 64 +/- 2%; in contrast, 3T3-L1 CM inhibited the growth of MCF-7 cells by 36 +/- 1%. In parallel with these growth studies, thymidine incorporation increased by 20 +/- 4% in NMMG cells and decreased by 72 +/- 5% in the MCF-7 cells. Moreover, a similar effect was also noted in NCI H630 colon cancer cells, where 3T3-L1 CM produced a 58 +/- 4% decrease in growth and a 82 +/- 6% decrease in thymidine incorporation. Heating the 3T3-L1 CM at 100-degrees-C for 30 min destroyed all inhibitory activity. Several known inhibitory growth factors (fibroblast growth factor, 20 ng/ml; interleukin 6, 1000 units/ml; tumor necrosis factor alpha, 15 ng/ml; transforming growth factor beta, 1 ng/ml) were tested for activity in the MCF-7 cells. Tumor necrosis factor alpha and transforming growth factor beta produced a 97% and 67% inhibition of thymidine uptake, respectively, whereas interleukin 6 and fibroblast growth factor had no effect. Neither transforming growth factor beta nor tumor necrosis factor alpha activity was detectable in 3T3-L1 CM using an enzyme-linked immunosorbent assay. High-performance liquid chromatography fractionation of the 3T3-L1 CM revealed that the inhibitory activity eluted at a molecular weight of 67,000; moreover, silver staining of these eluates on a denaturing polyacrylamide gel revealed that M(r) 69,000 peptide was the predominant protein band in the inhibitory fractions. Thus 3T3-L1 CM stimulates the growth of normal breast epithelial cells and inhibits the growth of MCF-7 breast cancer cells. This inhibitory activity appears to be due to a protein secreted by 3T3-L1 preadipocytes. C1 NICHHD,THEORET & PHYS BIOL LAB,BETHESDA,MD 20892. RP JOHNSTON, PG (reprint author), USN HOSP,NCI,DIV CANC TREATMENT,MED ONCOL BRANCH,BLDG 8,ROOM 5101,BETHESDA,MD 20892, USA. NR 34 TC 23 Z9 24 U1 0 U2 2 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD DEC 15 PY 1992 VL 52 IS 24 BP 6860 EP 6865 PG 6 WC Oncology SC Oncology GA KB979 UT WOS:A1992KB97900020 PM 1458474 ER PT J AU SALVINO, RE BUOT, FA AF SALVINO, RE BUOT, FA TI SELF-CONSISTENT MONTE-CARLO PARTICLE-TRANSPORT WITH MODEL QUANTUM TUNNELING DYNAMICS - APPLICATION TO THE INTRINSIC BISTABILITY OF A SYMMETRICAL DOUBLE-BARRIER STRUCTURE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GALLIUM ARSENIDE; SIMULATION; TIMES; TRAJECTORIES; DEVICES AB The intrinsic bistability in a symmetric resonant tunneling device (RTD) is simulated by the ensemble particle Monte Carlo technique, coupled with a simple model of the space- and time-dependent particle quantum dynamics inside the double-barrier region of the RTD. This model particle quantum dynamics is based upon the phase-time delay, which is obtained from a piecewise-linear-potential Airy function approach to the calculation of the transmission amplitude. An unambiguous hysteresis in the negative differential resistance (NDR) region of the current-voltage (I-V) characteristic is observed for a symmetric AlGaAs/GaAs double-barrier structure. The dynamical accumulation of carriers in the well is seen to be the cause of this marked bistability/hysteresis. However, the plateau-like features of the I-V curve are not resolved, although oscillations in the quantum well carrier density in the NDR are prominent. This article strongly suggests that a more accurate treatment of the space- and time-dependent particle quantum dynamics across the RTD is of paramount importance. RP SALVINO, RE (reprint author), USN,RES LAB,CODE 6864,WASHINGTON,DC 20375, USA. NR 30 TC 13 Z9 13 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 15 PY 1992 VL 72 IS 12 BP 5975 EP 5981 DI 10.1063/1.351907 PG 7 WC Physics, Applied SC Physics GA KC850 UT WOS:A1992KC85000064 ER PT J AU SHAY, LK BLACK, PG MARIANO, AJ HAWKINS, JD ELSBERRY, RL AF SHAY, LK BLACK, PG MARIANO, AJ HAWKINS, JD ELSBERRY, RL TI UPPER OCEAN RESPONSE TO HURRICANE GILBERT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID FLUX MEASUREMENTS; INTERNAL WAVES; WINDS; GULF; WAKE AB The evolving upper ocean response excited by the passage of hurricane Gilbert (September 14-19, 1988) was investigated using current and temperature observations acquired from the deployment of 79 airborne expendable current profilers (AXCPs) and 51 airborne expendable bathythermographs from the National Oceanic and Atmospheric Administration WP-3D aircraft in the western Gulf of Mexico. The sea surface temperatures (SSTs), mixed layer depths, and bulk Richardson numbers were objectively analyzed to examine the spatial variability of the upper ocean response to Gilbert. Net decreases of the SSTs of 3-degrees-4-degrees-C were observed by the profilers as well as by the airborne infrared thermometer (AIRT) along the flight tracks and advanced very high resolution radiometer (AVHRR) imagery. The AXCPs indicated a marked cooling from 29-degrees-C to about 25.5-degrees-C on September 17, 1988, which was about 1.2 inertial periods (IP) following storm passage. This pool of cooler water (3.5-degrees) was located further downstream in the hurricane wake by September 19 (2.7 IP following the storm) as a result of the near-inertial currents in the mixed layer. While there was a bias of about 0.6-degrees-C and 1.7-degrees-C between the in situ and AVHRR-derived SSTs, respectively, both the AVHRR images and the objectively analyzed fields indicated a rightward bias in the upper ocean cooling that extended from the storm track to about 4R(max) (where R(max), the radius of maximum winds, is equal to 50 km). The larger SST offset of 1.7-degrees-C was due to the difference between the time of the AVHRR image and the time of the aircraft experiment on September 19. The SSTs derived from the AVHRR images and the AIRT also indicated large gradients between the cold wake and the warm eddy in the central Gulf of Mexico. The mixed layer deepened by about 30-35 m on the right side of the track during the storm and 1.2 IP later, with little evidence of continued deepening afterward. The mixed layer current vectors demonstrate that a strong, near-inertially rotating current was excited by the passage of Gilbert, with maxima of about 1-1.4 m s-1. The currents, observed during and subsequent to (1.2 IP) the storm, diverged from the storm track, whereas the mixed layer current vectors 2.7 IP after storm passage converged toward the track, with relative maxima of 0.8-1 m s-1. This alternating pattern of convergence and divergence of the mixed layer current was associated with the upwelling and downwelling cycles of the baroclinic response. Considerable current shear existed between the mixed layer and the thermocline currents in the cool wake between the storm track and the 4R(max). Estimates of the bulk Richardson numbers ranged between 0.2 and 1.0 during Gilbert and at 1.2 IP, which suggests that enhanced current shears were responsible for some of the mixed layer deepening. C1 USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA. NOAA,ATLANTIC OCEANOG & METEOROL LAB,DIV HURRICANE RES,MIAMI,FL 33149. USN,RES LAB,REMOTE SENSING BRANCH,BAY ST LOUIS,MS 39529. RP SHAY, LK (reprint author), UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,DIV METEOROL & PHYS OCEANOG,MIAMI,FL 33149, USA. NR 47 TC 107 Z9 115 U1 0 U2 11 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 1992 VL 97 IS C12 BP 20227 EP 20248 DI 10.1029/92JC01586 PG 22 WC Oceanography SC Oceanography GA KE656 UT WOS:A1992KE65600010 ER PT J AU FREEMAN, GJ LOMBARD, DB GIMMI, CD BROD, SA LEE, K LANING, JC HAFLER, DA DORF, ME GRAY, GS REISER, H JUNE, CH THOMPSON, CB NADLER, LM AF FREEMAN, GJ LOMBARD, DB GIMMI, CD BROD, SA LEE, K LANING, JC HAFLER, DA DORF, ME GRAY, GS REISER, H JUNE, CH THOMPSON, CB NADLER, LM TI CTLA-4 AND CD28 MESSENGER-RNA ARE COEXPRESSED IN MOST T-CELLS AFTER ACTIVATION - EXPRESSION OF CTLA-4 AND CD28 MESSENGER-RNA DOES NOT CORRELATE WITH THE PATTERN OF LYMPHOKINE PRODUCTION SO JOURNAL OF IMMUNOLOGY LA English DT Article ID I-ASSOCIATED MYELOPATHY; NEOPLASTIC-B-CELLS; COSTIMULATORY SIGNAL; LYMPHOCYTES-T; MOLECULAR-CLONING; ANTIGEN RECEPTOR; IL-2 PRODUCTION; GENE; INTERLEUKIN-2; SUPERFAMILY AB Ag-presenting cells provide at least two distinct signals for T cell activation. T cell receptor-dependent stimulation is provided by presentation of a specific peptide Ag in association with MHC molecules. In addition, APC also supply costimulatory signals required for T cell activation that are neither Ag- nor MHC restricted. One such costimulatory signal is mediated via the interaction of B7 on APC with the CD28 receptor on T cells. Recently, CTLA-4 has been shown to be a second B7 receptor on T cells. In the present report, we have examined the expression of CD28 and CTLA-4 on a panel of resting and activated normal T cell subsets and T cell clones by RNA blot analysis in an attempt to determine whether their expression defines reciprocal or overlapping subsets. CD28 was detected in resting T cells, whereas CTLA-4 was not. After stimulation with PHA and PMA for 24 h, CTLA-4 mRNA was expressed in both the CD4+ and CD8+ subsets as well as in CD28+ T cells. We examined 37 human and six murine T cell clones that had been previously characterized for their cytokine production. After activation, CTLA-4 and CD28 mRNA were coexpressed in 36 of 37 human T cell clones and all six murine T cell clones. These included T cells of CD4+8-, CD4-8+, and CD4-8- phenotypes as well as clones with Th1 and Th2 cytokine profiles. In contrast, CD28 but not CTLA-4 mRNA was detected in leukemic T cell lines and myelomas. CTLA-4 and B7 mRNA but not CD28 mRNA was detected in two long term HTLV-I-transformed T cell lines. These data demonstrate that CD28 and CTLA-4 mRNA are coexpressed in most activated T cells and T cell clones, providing evidence that they do not define reciprocal subsets. Moreover, they are consistent with the hypothesis that B7 transmits its signal through a single receptor, CD28, on resting T cells, and multiple receptors, CD28 and CTLA-4, on activated T cells. C1 HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DEPT MED,DIV LYMPHOCYTE BIOL,BOSTON,MA 02115. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DEPT PATHOL,BOSTON,MA 02115. HARVARD UNIV,SCH MED,DEPT PATHOL,BOSTON,MA 02115. HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,CTR NEUROL DIS,BOSTON,MA 02115. UNIV MICHIGAN,DEPT MED MICROBIOL & IMMUNOL,ANN ARBOR,MI 48109. REPLIGEN CORP,CAMBRIDGE,MA 02139. USN,RES LAB,IMMUNE CELL BIOL PROGRAM,WASHINGTON,DC 20375. RP FREEMAN, GJ (reprint author), HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DEPT MED,DIV TUMOR IMMUNOL,MAYER 726,44 BINNEY ST,BOSTON,MA 02115, USA. FU NCI NIH HHS [CA-40216]; NINDS NIH HHS [R01NS24247] NR 52 TC 139 Z9 141 U1 0 U2 1 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD DEC 15 PY 1992 VL 149 IS 12 BP 3795 EP 3801 PG 7 WC Immunology SC Immunology GA KB982 UT WOS:A1992KB98200004 PM 1281186 ER PT J AU VANSEVENTER, GA BONVINI, E YAMADA, H CONTI, A STRINGFELLOW, S JUNE, CH SHAW, S AF VANSEVENTER, GA BONVINI, E YAMADA, H CONTI, A STRINGFELLOW, S JUNE, CH SHAW, S TI COSTIMULATION OF T-CELL RECEPTOR CD3-MEDIATED ACTIVATION OF RESTING HUMAN CD4+ T-CELLS BY LEUKOCYTE FUNCTION-ASSOCIATED ANTIGEN-1 LIGAND INTERCELLULAR CELL-ADHESION MOLECULE-1 INVOLVES PROLONGED INOSITOL PHOSPHOLIPID HYDROLYSIS AND SUSTAINED INCREASE OF INTRACELLULAR CA2+ LEVELS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID TYROSINE PHOSPHORYLATION; SIGNAL TRANSDUCTION; MONOCLONAL-ANTIBODY; MEDIATED ACTIVATION; CYTOPLASMIC DOMAIN; GROWTH-FACTOR; BETA-SUBUNIT; B-CELLS; ICAM-1; LFA-1 AB Activation of resting human CD4+ T cells mediated by mAb ligation of the TCR/CD3 complex requires costimulatory signals to result in proliferation; these can be provided by intercellular cell adhesion molecule-1 (ICAM-1, CD54) a natural ligand of leukocyte function-associated Ag-1 (LFA-1, CD11a/CD18). We analyzed early signaling events involved in T cell activation to determine the contribution by the LFA-1/ICAM-1 interaction. We studied in detail the hydrolysis of phosphatidylinositol(4,5)bisphosphate and intracellular levels of free Ca2+ during stimulation with beads coated with the CD3 mAb OKT3 alone or in combination with purified ICAM-1 protein. Our investigations show no response to LFA-1/ICAM-1 alone, but that costimulation by LFA-1/ICAM-1 interaction induces prolonged inositol phospholipid hydrolysis (up to 4 h), resulting in generation of both inositol(1,4,5)phosphate3 and inositol(1,3,4,5)phosphate4 and their derivatives. Based on studies with cycloheximide, this costimulatory effect of prolonged inositol phospholipid hydrolysis appears dependent in part on de novo protein synthesis. A sustained increase in intracellular levels of free Ca2+ level is also observed after LFA-1/ICAM-1 costimulation, which is at least partly dependent on extracellular sources of Ca2+. Kinetic studies indicate that costimulation requires a minimal period of 4 h of LFA-1/ICAM-1 interaction to provide maximal costimulation for OKT3-mediated T cell proliferation. Thus, the necessary costimulation required for OKT3-mediated proliferation in this model system may be provided by an extended LFA-1/ICAM-1 interaction that in combination with OKT3 mAb leads to signal-transducing events, resulting in prolonged phospholipase C activation and phosphatidylinositol(4,5)bisphosphate hydrolysis, and a sustained increase in intracellular levels of free Ca2+. C1 NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. US FDA,CTR BIOL EVALUAT & RES,BETHESDA,MD 20892. NIAID,CELLULAR & MOLEC IMMUNOL LAB,BETHESDA,MD 20892. NR 53 TC 114 Z9 114 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 15 PY 1992 VL 149 IS 12 BP 3872 EP 3880 PG 9 WC Immunology SC Immunology GA KB982 UT WOS:A1992KB98200014 PM 1360995 ER PT J AU ADLER, CL RABINOVICH, WS CLEMENT, AE GILBREATH, GC FELDMAN, BJ AF ADLER, CL RABINOVICH, WS CLEMENT, AE GILBREATH, GC FELDMAN, BJ TI COMPARISON OF PHOTOREFRACTIVE BEAM FANNING USING MONOCHROMATIC AND ACHROMATIC 2-WAVE MIXING IN SBN SO OPTICS COMMUNICATIONS LA English DT Article ID SUPPRESSION AB Beam fanning is examined as a noise source in monochromatic and achromatic two-wave mixing. We show that fanning acts mainly as a parasitic loss for low beam ratios, whereas it contributes a background noise floor for high beam ratios. In the first regime, fanning loss is much smaller in achromatic two-wave mixing than in the monochromatic case. C1 USN,RES LAB,COMMUN SYST BRANCH,WASHINGTON,DC 20375. RP ADLER, CL (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD DEC 15 PY 1992 VL 94 IS 6 BP 609 EP 618 DI 10.1016/0030-4018(92)90610-4 PG 10 WC Optics SC Optics GA KB794 UT WOS:A1992KB79400020 ER PT J AU NGAI, KL PENG, SL TSANG, KY AF NGAI, KL PENG, SL TSANG, KY TI FRACTAL PHASE-SPACE TRANSPORT DYNAMICS AND RELAXATIONS IN COMPLEX CORRELATED SYSTEMS SO PHYSICA A LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON FRACTALS AND DISORDERED SYSTEMS CY JUL 29-31, 1992 CL UNIV HAMBURG, HAMBURG, GERMANY SP DEUT FORSCHUNGSGEMEINSCH, DEUT AKADEM AUSTAUSCHDIENST, HOCHSCHULAMT HAMBURG, IBM, SIEMENS NIXDORF, DIGITAL EQUIPMENT HO UNIV HAMBURG ID MARKOV-TREE MODEL; HAMILTONIAN-SYSTEMS; IONIC CONDUCTORS; POLYMER; DIFFUSION; LIQUIDS; ENERGY; FLOW AB ''Stickiness'' of transport in fractal-like phase space with a mixture of regular an chaotic regions and an infinite hierarchy of small islands interspersed in the chaotic region of chaotic Hamiltonian systems is used to build a theoretical basis of the coupling model for relaxations in complex correlated systems. C1 GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 38 TC 69 Z9 69 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD DEC 15 PY 1992 VL 191 IS 1-4 BP 523 EP 531 DI 10.1016/0378-4371(92)90576-C PG 9 WC Physics, Multidisciplinary SC Physics GA KF666 UT WOS:A1992KF66600081 ER PT J AU SCHWARTZ, IB TRIANDAF, I AF SCHWARTZ, IB TRIANDAF, I TI TRACKING UNSTABLE ORBITS IN EXPERIMENTS SO PHYSICAL REVIEW A LA English DT Article ID CONTROLLING CHAOS AB We present an alternative continuation method for tracking unstable periodic orbits by slowly varying an available system parameter. This is a predictor-corrector method for which we assume that initially the orbit is on a chaotic attractor. As we vary the parameter, the method can be used to track the orbit through regimes not necessarily chaotic. The method is designed for experimental situations in which we have no analytical knowledge of the system dynamics and only an experimental time series of the variables involved is available. We present numerical results of the method using the Henon map. RP SCHWARTZ, IB (reprint author), USN,RES LAB,SPECIAL PROJECT NONLINEAR SCI,DIV PLASMA PHYS,CODE 67003,WASHINGTON,DC 20375, USA. RI Schwartz, Ira/A-8073-2009 NR 10 TC 73 Z9 74 U1 0 U2 3 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 15 PY 1992 VL 46 IS 12 BP 7439 EP 7444 DI 10.1103/PhysRevA.46.7439 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KE871 UT WOS:A1992KE87100017 ER PT J AU KANIA, DR KORNBLUM, H HAMMEL, BA SEELY, J BROWN, C FELDMAN, U GLENDINNING, G YOUNG, P HSIEH, E HENNESIAN, M DASILVA, L MACGOWAN, BJ MONTGOMERY, DS BACK, CA DOYAS, R EDWARDS, J LEE, RW AF KANIA, DR KORNBLUM, H HAMMEL, BA SEELY, J BROWN, C FELDMAN, U GLENDINNING, G YOUNG, P HSIEH, E HENNESIAN, M DASILVA, L MACGOWAN, BJ MONTGOMERY, DS BACK, CA DOYAS, R EDWARDS, J LEE, RW TI CHARACTERIZATION OF AN X-RAY-FLUX SOURCE FOR THE PRODUCTION OF HIGH-ENERGY-DENSITY PLASMAS SO PHYSICAL REVIEW A LA English DT Article ID LASER IRRADIATION; DISK TARGETS; SPECTROGRAPH; RADIATION; TRANSPORT; EMISSION; SPECTRA; HOT AB The results from a series of experiments that characterize the x-ray flux transmitted through a laser-irradiated Au foil are presented. The purpose of the experiments was to develop a working model for an x-ray source that will create hot, dense plasmas with controllable gradients. These plasmas will be used as a test bed for the study of the complex radiative processes that are intrinsic to the evolution of moderate- and high-Z matter. The experiments quantitatively measured the time- and frequency-dependent energy transferred to the back of the foil. Angular information and the characterization of the flux as a function of foil thickness are also presented. Tables of the time-dependent flux are given. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. ECOLE POLYTECH, PHYS MILIEUX IONISES LAB, F-91128 PALAISEAU, FRANCE. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, BLACKETT LAB, LONDON SW7 2BZ, ENGLAND. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP KANIA, DR (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94550 USA. OI Montgomery, David/0000-0002-2355-6242 NR 25 TC 43 Z9 43 U1 1 U2 8 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 EI 1094-1622 J9 PHYS REV A JI Phys. Rev. A PD DEC 15 PY 1992 VL 46 IS 12 BP 7853 EP 7868 DI 10.1103/PhysRevA.46.7853 PG 16 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KE871 UT WOS:A1992KE87100060 ER PT J AU SINGH, DJ KLEIN, BM AF SINGH, DJ KLEIN, BM TI ELECTRONIC-STRUCTURE, LATTICE STABILITY, AND SUPERCONDUCTIVITY OF CRC SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL CARBIDES; PALLADIUM-HYDROGEN SYSTEM; BRILLOUIN-ZONE; BAND-STRUCTURE; SPECIAL POINTS; TOTAL-ENERGY; NITRIDES; TITANIUM; INTERPOLATION; VANADIUM AB Electronic-structure and total-energy calculations are used to elucidate the properties of the recently synthesized NaCl-structure CrC phase. The lattice parameter, elastic constants, GAMMA-point optic-phonon frequency, and formation energy are determined using total-energy methods. No sign of lattice instabilities is found, indicating that NaCl-structure CrC is a true metastable phase. In fact, the elastic constants and optic-phonon frequency have values comparable to those in other known NaCl-structure transition-metal carbides. On the other hand, and in contrast to VC and NbC, CrC is found to be unstable with respect to phase separation into C and Cr, explaining the difficulty of its synthesis. The electronic structure is qualitatively similar to that of TiC and VC except for the placement of the Fermi level E(F). A relatively high density of states at E(F), which is derived from weakly hybridized Cr d states, is found. However, fixed-spin-moment calculations show that this does not lead to a ferromagnetic instability. Rigid muffin-tin approximation electron-phonon-interaction calculations lead to a prediction that CrC is a superconductor with a transition temperature in the range 5-10 K. RP SINGH, DJ (reprint author), USN,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 35 TC 19 Z9 19 U1 1 U2 11 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 15 PY 1992 VL 46 IS 23 BP 14969 EP 14974 DI 10.1103/PhysRevB.46.14969 PG 6 WC Physics, Condensed Matter SC Physics GA KG306 UT WOS:A1992KG30600001 ER PT J AU FLOM, SR PONG, RGS BARTOLI, FJ KAFAFI, ZH AF FLOM, SR PONG, RGS BARTOLI, FJ KAFAFI, ZH TI RESONANT NONLINEAR OPTICAL-RESPONSE OF THE FULLERENES C-60 AND C-70 SO PHYSICAL REVIEW B LA English DT Note ID EXCITED-STATE PROPERTIES; EMPTY ELECTRONIC STATES; PHOTOPHYSICAL PROPERTIES; TRANSIENT ABSORPTION; TRIPLET-STATE; SOLID C60; SPECTRA; C70; FILMS; BUCKMINSTERFULLERENE AB Time-resolved degenerate four-wave mixing experiments were conducted on films of pure C60 and C70 using a picosecond tunable dye laser. The fullerenes exhibit a large third-order optical response, and their dynamics show wavelength and fluence dependence. The temporal response is characterized by a long-lived component attributed to the triplet excited state and an early decay associated with population of the singlet excited state. This fast response is considerably shortened at higher laser fluences and an excitonic singlet-singlet annihilation mechanism is proposed. RP FLOM, SR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 49 TC 75 Z9 76 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1992 VL 46 IS 23 BP 15598 EP 15601 DI 10.1103/PhysRevB.46.15598 PG 4 WC Physics, Condensed Matter SC Physics GA KG306 UT WOS:A1992KG30600093 ER PT J AU FOX, AG STONER, TA CADE, SC AF FOX, AG STONER, TA CADE, SC TI TOWARDS EXTINCTION-FREE METALLURGICAL POWDERS FOR X-RAY-DIFFRACTION - AN APPLICATION TO GAMMA-TIAL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ALLOYS; SOLIDIFICATION RP FOX, AG (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI SECT,MONTEREY,CA 93943, USA. NR 21 TC 3 Z9 3 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 15 PY 1992 VL 27 IS 12 BP 1765 EP 1770 DI 10.1016/0956-716X(92)90016-8 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KA975 UT WOS:A1992KA97500016 ER PT J AU ROMERO, H GANGULI, G LEE, YC AF ROMERO, H GANGULI, G LEE, YC TI ION-ACCELERATION AND COHERENT STRUCTURES GENERATED BY LOWER HYBRID SHEAR-DRIVEN INSTABILITIES SO PHYSICAL REVIEW LETTERS LA English DT Article ID SHEET BOUNDARY-LAYER; DRIFT INSTABILITY; PLASMA; SIMULATION; PARTICLE; FIELD; WAVES AB It is shown that if kappa = omega(S)/omega(LH) > 1 (omega(S) and omega(LH) are the shear and lower hybrid frequencies), a sheared electron cross-field flow excites the electron-ion-hybrid mode, causing significant perpendicular ion acceleration. The electric potential develops coherent structures (vortexlike) longer than the electron Larmor radius, rho(e). For kappa < 1, a smooth transition occurs where the wavelength becomes of the order of rho(e), the lower hybrid drift instability dominates, and the formation of vortexlike structures is no longer observed. The results are relevant to laboratory, laser-produced. and space plasmas. C1 UNIV MARYLAND,DEPT PHYS & ASTRON,COLL PK,MD 20742. RP ROMERO, H (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 19 TC 26 Z9 26 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD DEC 14 PY 1992 VL 69 IS 24 BP 3503 EP 3506 DI 10.1103/PhysRevLett.69.3503 PG 4 WC Physics, Multidisciplinary SC Physics GA KB857 UT WOS:A1992KB85700022 ER PT J AU AMMAN, M BENJACOB, E COHN, JL AF AMMAN, M BENJACOB, E COHN, JL TI THERMOELECTRIC AND THERMO-COULOMB EFFECTS IN TUNNEL-JUNCTIONS SO PHYSICS LETTERS A LA English DT Article ID MICROSCOPE AB We present a study of the thermoelectric effects in tunnel junctions. In particular we calculate the thermoelectric power coefficient S and the Peltier coefficient PI. For macroscopic junctions we demonstrate the sensitivity of S and PI to the structure of the density of states. For mesoscopic junctions we show that Coulomb effects modify the ordinary Onsager picture and the relation PI = - TS. The coefficients S and PI are found to be very sensitive to the coupling of the junctions to the external world. We comment on the relevance of these effects to scanning tunneling microscope measurements. C1 USN,RES LAB,WASHINGTON,DC 20375. TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. RP AMMAN, M (reprint author), UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109, USA. NR 19 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD DEC 14 PY 1992 VL 171 IS 5-6 BP 389 EP 396 DI 10.1016/0375-9601(92)90663-7 PG 8 WC Physics, Multidisciplinary SC Physics GA KD204 UT WOS:A1992KD20400029 ER PT J AU HABERLEN, OD ROSCH, N DUNLAP, BI AF HABERLEN, OD ROSCH, N DUNLAP, BI TI ARE ENDOHEDRAL METAL (IV)C28 COMPOUNDS HYPERVALENT SO CHEMICAL PHYSICS LETTERS LA English DT Article ID LINEAR COMBINATION; X-ALPHA; C-60; FULLERENES; CEROCENE AB Nonrelativistic and, where appropriate, scalar-relativistic linear combination of Gaussian-type orbital (LCGTO) local density functional (LDF) calculations on Ti@C28, Ce@C28, Ti@C28H4, Ce@C28H4, the corresponding empty fullerene C28, and the corresponding hydrogenated fullerene C28H4 are compared. The empty fullerene is tetravalent and strongly binds four hydrogen atoms on its exterior or a tetravalent atom inside. Combining a tetravalent endohedral atom with four exterior hydrogen atoms significantly weakens the two different sets of bounds and leads to an open-shell electronic structure. C1 TECH UNIV MUNICH,LEHRSTUHL THEORET CHEM,W-8046 GARCHING,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. RI Roesch, Notker/C-1182-2010; OI Dunlap, Brett/0000-0003-1356-6559 NR 32 TC 36 Z9 36 U1 0 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 11 PY 1992 VL 200 IS 4 BP 418 EP 423 DI 10.1016/0009-2614(92)87014-G PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KB488 UT WOS:A1992KB48800014 ER PT J AU DECOSTA, BR MATTSON, MV GEORGE, C LINDERS, JTM AF DECOSTA, BR MATTSON, MV GEORGE, C LINDERS, JTM TI SYNTHESIS, CONFIGURATION, AND ACTIVITY OF ISOMERIC 2-PHENYL-2-(N-PIPERIDINYL)BICYCLO[3.1.0]HEXANES AT PHENCYCLIDINE AND SIGMA-BINDING SITES SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID D-ASPARTATE RECEPTOR; ANTICONVULSANT MK-801; RAT-BRAIN; ABSOLUTE-CONFIGURATION; POTENT; ANTAGONIST; MEMBRANES; COMPLEX; ANALOGS; INVIVO AB The novel semirigid derivatives (+)-cis-1-[2-phenyl-2-bicyclo[3.1.0]hexyl]piperidine [(+)-8], its enantiomer (-)-8, and (+/-)-trans-1-[2-phenyl-2-bicyclo[3.1.0]hexyl]piperidine [(+/-)-9] were synthesized as probes to investigate the mode of interaction of phencyclidine (PCP) with its binding site on the N-methyl-D-aspartate receptor complex. Each target compound was obtained in five steps starting from cyclopent-2-enone. (+)- and (-)-8 were obtained in greater than 98% optical purity through three recrystallizations from ethanol of the (S)-(+)- and (R)-(-)-mandelate salts of intermediate (+/-)-cis-2-phenyl-2-bicyclo[3.1.0]hexylamine([+/-)-16]. Crystallization of the (R)-(-)mandelate salt afforded (1R,2R,5S)-(-)-16, whereas the (S)-(+)-mandelate salt afforded (1S,2S,5R)-(+)-16; the absolute configuration was determined by single-crystal X-ray analysis of (-)-16.(R)-(-)-mandelate. Single-crystal X-ray analysis of (+/-)-9-picrate confirmed its trans configuration and provided conformational data. (+)- and (-)-8 and (+/-)-9 were examined for their ability to interact with PCP and sigma binding sites in vitro using [H-3]TCP and [H-3]pentazocine as radioligands. The binding was compared with that of PCP and contrasted with the rigid symmetrical phencyclidine derivatives cis- and trans-1-[3-phenyl-3-bicyclo[3.1.0]hexyl]piperidines (6 and 7). The results of the study indicated that the conformations of PCP represented by 6-9 are not optimal for potent interaction at either of these sites. Affinities ranged from 582 nM [(+/-)-9] to 29 000 nM [(+)-8] at PCP binding sites and from 1130 nM [(-)-8] to 16 300 nM (7) at sigma sites. In this assay, PCP exhibited affinities of 64.5 nM at PCP and 1090 nM at sigma sites. Qualitative correlation between the sigma and PCP binding data suggests some similarities between these binding sites. An axial phenyl and equatorial piperidine ring with the nitrogen lone pair of electrons antiperiplanar to the phenyl ring has been postulated as the receptor-active conformation of PCP-like ligands at the PCP binding site. Comparison of the binding data of 7-9 with that of the previously described methylcyclohexyl-PCP derivatives allowed its rationalization in terms of this model. It is likely that the lowered affinity in this bicyclo[3.1.0]hexane series is a consequence of nonoptimal geometry (pseudoequatorial phenyl or pseudoboat) for binding as opposed to the presence of steric bulk which proved deleterious in the methylcyclohexyl-PCP derivatives. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP DECOSTA, BR (reprint author), NIDDKD,MEDICINAL CHEM LAB,9000 ROCKVILLE PIKE,BETHESDA,MD 20892, USA. NR 57 TC 10 Z9 10 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD DEC 11 PY 1992 VL 35 IS 25 BP 4704 EP 4712 DI 10.1021/jm00103a008 PG 9 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA KD458 UT WOS:A1992KD45800008 PM 1469699 ER PT J AU SHEELEY, NR WANG, YM NASH, AG AF SHEELEY, NR WANG, YM NASH, AG TI A NEW DETERMINATION OF THE SOLAR ROTATION RATE SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, MAGNETIC FIELDS; SUN, ROTATION ID PHOTOSPHERIC MAGNETIC-FIELD; SUNSPOT CYCLE-21; PATTERNS; SUN AB We use "stackplot" displays to compare observations of the photospheric magnetic field during sunspot cycle 21 with simulations based on the flux-transport model. Adopting nominal rates of diffusion, differential rotation, and meridional flow, we obtain slanted patterns similar to those of the observed field, even when the sources of flux are assigned random longitudes in the model. At low latitudes, the slopes of the nearly vertical patterns of simulated field are sensitive to the rotation rate used in the calculation, and insensitive to the rates of diffusion and flow during much of the sunspot cycle. Good agreement between the observed and simulated patterns requires a synodic equatorial rotation period of 26.75 +/- 0.05 days, which is within the limits obtained by Komm et al., but significantly less than the traditional 26.90 day value of Snodgrass and Newton & Nunn. Below 55-degrees latitude, we obtain the synodic rotation rate omega(theta) = 13.46 - 2.7 cos2 theta + 1.2 cos4 theta - 3.2 cos6 theta deg day-1, where theta is colatitude. RP SHEELEY, NR (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4172,WASHINGTON,DC 20375, USA. NR 23 TC 17 Z9 17 U1 1 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD DEC 10 PY 1992 VL 401 IS 1 BP 378 EP 385 DI 10.1086/172069 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KB243 UT WOS:A1992KB24300037 ER PT J AU KEENAN, FP CONLON, ES FOSTER, VJ AGGARWAL, KM WIDING, KG AF KEENAN, FP CONLON, ES FOSTER, VJ AGGARWAL, KM WIDING, KG TI EXTREME ULTRAVIOLET LINE RATIOS FOR CA XV APPLICABLE TO SOLAR-FLARE SPECTRA SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; ATOMIC PROCESSES; SUN, FLARES; SUN, UV RADIATION ID FINE-STRUCTURE LEVELS; EFFECTIVE COLLISION STRENGTHS; ELECTRON-IMPACT EXCITATION; 7 2-RIBBON FLARE; NE-V; STRUCTURE TRANSITIONS; XUV OBSERVATIONS; COMPACT FLARE; GROUND-STATE; MG-VII AB New R-matrix calculations of electron impact excitation rates in Ca xv are used to derive theoretical electron density diagnostic emission-line ratios involving 2s(2)2p(2)-2s2p3 transitions in the wavelength range approximately 180-215 angstrom. A comparison of these with observational data for solar flares obtained with the Naval Research Laboratory's S082A spectrograph on board Skylab reveals excellent agreement between theory and observation, as does a comparison with line ratio measurements from the TEXT tokamak plasma, for which the electron temperature and density have been independently determined. This provides experimental support for the accuracy of the atomic data, and hence line ratio calculations, employed in the present analysis. C1 UNIV DELHI,DEPT PHYS & ASTRON,DELHI 110007,INDIA. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 37 TC 10 Z9 10 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 1992 VL 401 IS 1 BP 411 EP 415 DI 10.1086/172072 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KB243 UT WOS:A1992KB24300040 ER PT J AU WEMHOFF, GA RABBANY, SY KUSTERBECK, AW OGERT, RA BREDEHORST, R LIGLER, FS AF WEMHOFF, GA RABBANY, SY KUSTERBECK, AW OGERT, RA BREDEHORST, R LIGLER, FS TI KINETICS OF ANTIBODY-BINDING AT SOLID-LIQUID INTERFACES IN FLOW SO JOURNAL OF IMMUNOLOGICAL METHODS LA English DT Article DE DISPLACEMENT; IMMUNOASSAY; BIOSENSOR ID IMMOBILIZED ANTIGEN; IMMUNOASSAY; SURFACE AB We have developed the theoretical framework for a displacement immunoassay conducted in flow under nonequilibrium conditions. Using a repetitive displacement technique, we determined the displacement rate and apparent dissociation rate constant at different flow rates. Our data suggest that the kinetics are best described by a first-order function. The displacement efficiency, the displacement rate, and therefore the apparent dissociation rate constant were calculated and demonstrated to be flow rate dependent. The theoretical framework developed in this study was successful in predicting the behavior of antigen displacement in flow. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. UNIV HAMBURG,DEPT BIOCHEM & MOLEC BIOL,W-2000 HAMBURG 13,GERMANY. HOFSTRA UNIV,DEPT ENGN,BIOENGN PROGRAM,HEMPSTEAD,NY 11550. NR 14 TC 37 Z9 37 U1 2 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-1759 J9 J IMMUNOL METHODS JI J. Immunol. Methods PD DEC 8 PY 1992 VL 156 IS 2 BP 223 EP 230 DI 10.1016/0022-1759(92)90029-S PG 8 WC Biochemical Research Methods; Immunology SC Biochemistry & Molecular Biology; Immunology GA KH668 UT WOS:A1992KH66800010 PM 1474258 ER PT J AU YU, HY SANDAY, SC AF YU, HY SANDAY, SC TI ELASTIC INHOMOGENEOUS INCLUSION AND INHOMOGENEITY IN BIMATERIALS SO PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Note ID ELLIPTIC INHOMOGENEITY; STRAIN; FIELD AB A method is presented for obtaining the elastic field due to an inhomogeneous inclusion or an inhomogeneity of any shape in two joined semi-infinite isotropic solids (bimaterials) which axe either perfectly bonded or in frictionless contact at the planar interface. Eshelby's equivalent inclusion method and the Galerkin vectors for double forces and double forces with moment in bimaterials are used to obtain the solution. The expression for the equivalent eigenstrains for an inhomogeneous inclusion or an inhomogeneity of arbitrary shape is obtained in terms of a system of singular integral equations which can then be solved numerically. The elastic fields for inhomogeneous inclusions and inhomogeneities are then obtained by treating the problem as a homogeneous inclusion. RP YU, HY (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 24 TC 13 Z9 13 U1 0 U2 2 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 1364-5021 J9 P ROY SOC LOND A MAT JI Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci. PD DEC 8 PY 1992 VL 439 IS 1907 BP 659 EP 667 DI 10.1098/rspa.1992.0175 PG 9 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KC460 UT WOS:A1992KC46000015 ER PT J AU STARKWEATHER, HW AVAKIAN, P MATHESON, RR FONTANELLA, JJ WINTERSGILL, MC AF STARKWEATHER, HW AVAKIAN, P MATHESON, RR FONTANELLA, JJ WINTERSGILL, MC TI ULTRALOW TEMPERATURE DIELECTRIC RELAXATIONS IN POLYOLEFINS SO MACROMOLECULES LA English DT Article ID NONCOOPERATIVE RELAXATIONS; ABSORPTION; POLYMERS; ALKANES AB Dielectric measurements were made on polyethylene, polypropylene, and a stabilizer, Irganox 1010, down to and below the temperature of liquid helium. All three materials exhibited a relaxation in which the frequency is proportional to the absolute temperature with f/T congruent-to 1 kHz/K. This phenomenon is indicative of quantum mechanical tunneling with an activation enthalpy close to zero and a negative activation entropy. Alternatively, the relationship may be expressed in terms of a transmission coefficient of about 3 X 10(-7). There is evidence that the presence of a stabilizer such as Irganox 1010 may be responsible for the ultralow temperature relaxation in the polymer samples. C1 USN ACAD, DEPT PHYS, ANNAPOLIS, MD 21402 USA. RP STARKWEATHER, HW (reprint author), DUPONT CO, CENT RES & DEV, EXPTL STN, WILMINGTON, DE 19880 USA. NR 23 TC 21 Z9 21 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 EI 1520-5835 J9 MACROMOLECULES JI Macromolecules PD DEC 7 PY 1992 VL 25 IS 25 BP 6871 EP 6875 DI 10.1021/ma00051a023 PG 5 WC Polymer Science SC Polymer Science GA KB785 UT WOS:A1992KB78500023 ER PT J AU ROLAND, CM AF ROLAND, CM TI TERMINAL AND SEGMENTAL RELAXATIONS IN EPOXIDIZED POLYISOPRENE SO MACROMOLECULES LA English DT Article ID TIME-CORRELATION FUNCTIONS; CONFORMATIONAL TRANSITIONS; THETA-SOLVENTS; POLYMERS; CHAIN; MODEL; ENTANGLEMENTS; DYNAMICS; DIAMETER; LIQUIDS AB The terminal and segmental dispersions in the dynamic mechanical spectra were measured for 1,4-polyisoprene (PIP) epoxidized to various levels. A systematic increase in the plateau modulus, arising from the transient entanglement network, is observed upon epoxidation. This increase is at odds with published correlations of the effect of chemical structure on chain entanglements. The segmental relaxation dispersion in the epoxidized polymers is broader and more sensitive to temperature than in the unmodified PIP, indicating enhanced intermolecular coupling of the segmental dynamics. The greater intermolecular cooperativity may reflect steric interactions promoted by the oxirane group. RP ROLAND, CM (reprint author), USN, RES LAB, DEPT CHEM, CODE 6120, WASHINGTON, DC 20375 USA. NR 55 TC 65 Z9 66 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 EI 1520-5835 J9 MACROMOLECULES JI Macromolecules PD DEC 7 PY 1992 VL 25 IS 25 BP 7031 EP 7036 DI 10.1021/ma00051a047 PG 6 WC Polymer Science SC Polymer Science GA KB785 UT WOS:A1992KB78500047 ER PT J AU KWOK, WK FLESHLER, S WELP, U VINOKUR, VM DOWNEY, J CRABTREE, GW MILLER, MM AF KWOK, WK FLESHLER, S WELP, U VINOKUR, VM DOWNEY, J CRABTREE, GW MILLER, MM TI VORTEX LATTICE MELTING IN UNTWINNED AND TWINNED SINGLE-CRYSTALS OF YBA2CU3O7-DELTA SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; THERMAL FLUCTUATIONS; PHASE-TRANSITIONS; FLUX; CREEP AB The melting transition in twinned and in twinned single crystals is measured resistively in fields up to 8 T as a function of the angle between the c axis and the a-b plane. The angular dependence follows the Lindemann criterion with c(L) = 0.15. The suppression of melting by strong pinning by twin boundaries is demonstrated. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. USN,RES LAB,WASHINGTON,DC 20375. RP KWOK, WK (reprint author), ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439, USA. NR 20 TC 372 Z9 372 U1 1 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 DEC 7 PY 1992 VL 69 IS 23 BP 3370 EP 3373 DI 10.1103/PhysRevLett.69.3370 PG 4 WC Physics, Multidisciplinary SC Physics GA KB203 UT WOS:A1992KB20300026 ER PT J AU ABRAMOFF, B COVINO, J AF ABRAMOFF, B COVINO, J TI TRANSMITTANCE AND MECHANICAL-PROPERTIES OF PMMA-FUMED SILICA COMPOSITES SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID VISCOELASTIC PROPERTIES; BEHAVIOR AB The transmittance, flexure strength, Young's modulus, and Vickers hardness of poly(methyl methacrylate) (PMMA), filled with fumed silica, was measured. Transmittance decreased with increasing content of filler. At 2 vol % filler content, composites had a higher transmittance with a lower surface area of fumed silica (larger primary particle size) because the lower surface area filler was better dispersed. At 4 vol % filler content, composites had a higher transmittance with a higher surface area fumed silica (smaller primary particle size). Flexure strength and Young's modulus of the composites was measured using three point bending. Addition of fumed silica led to a decrease of strength. Also, addition of fumed silica led to an increase of Young's modulus and Vickers hardness. RP ABRAMOFF, B (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. NR 24 TC 22 Z9 22 U1 1 U2 7 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD DEC 5 PY 1992 VL 46 IS 10 BP 1785 EP 1791 DI 10.1002/app.1992.070461009 PG 7 WC Polymer Science SC Polymer Science GA JX762 UT WOS:A1992JX76200009 ER PT J AU NIELSEN, AT NISSAN, RA CHAFIN, AP GILARDI, RD GEORGE, CF AF NIELSEN, AT NISSAN, RA CHAFIN, AP GILARDI, RD GEORGE, CF TI POLYAZAPOLYCYCLICS BY CONDENSATION OF ALDEHYDES WITH AMINES .3. FORMATION OF 2,4,6,8-TETRABENZYL-2,4,6,8-TETRAAZABICYCLO[3.3.0]OCTANES FROM FORMALDEHYDE, GLYOXAL, AND BENZYLAMINES SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID DERIVATIVES AB The condensation of formaldehyde, glyoxal, and benzylamine, in a stoichiometric ratio, leads to 2,4,6,8-tetrabenzyl-2,4,6,8-tetraazabicyclo[3.3.0]octane (1d) in methanol solvent with formic acid catalyst. Six phenyl-substituted derivatives of Id, as well as 2,4,6,8-tetraisopropyl-2,4,6,8-tetraazabicyclo[3.3.0]octane (1c), have been prepared in high yields by this synthetic method. Some of the chemical behavior of the new compounds is discussed. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP NIELSEN, AT (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 12 TC 36 Z9 37 U1 3 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD DEC 4 PY 1992 VL 57 IS 25 BP 6756 EP 6759 DI 10.1021/jo00051a016 PG 4 WC Chemistry, Organic SC Chemistry GA KB224 UT WOS:A1992KB22400016 ER PT J AU MCNAMARA, KM GLEASON, KK VESTYCK, DJ BUTLER, JE AF MCNAMARA, KM GLEASON, KK VESTYCK, DJ BUTLER, JE TI EVALUATION OF DIAMOND FILMS BY NUCLEAR-MAGNETIC-RESONANCE AND RAMAN-SPECTROSCOPY SO DIAMOND AND RELATED MATERIALS LA English DT Article ID C-13 NMR; DEPOSITION; SCATTERING; OXYGEN; TEMPERATURES; DEPENDENCE; SPECTRUM; GRAPHITE; ELEMENTS; PRESSURE AB The quality of chemically vapor deposited diamond films was assessed in terms of sp2/sp3 content as determined by solid-state nuclear magnetic resonance (NMR) and Raman spectroscopy. While the results of the two techniques are in qualitative agreement, only the NMR spectra yield quantitative values for the sp2/sp3 ratio. Only sp3 carbon was observed in the NMR spectra of very high quality hot-filament, microwave plasma, and d.c. arc-jet chemically vapor deposited films. As expected, Raman spectroscopy is extremely sensitive to sp2 bonded carbon, identifying small amounts below the detection limit of the NMR spectrometer. Comparison of the two techniques, however, indicates that Raman spectroscopy may be so sensitive to sp2 bonded carbon that sp3 bonded carbon in films containing as much as 90% sp3 bonded material may remain undetected. NMR linewidths indicate that the sp3 carbon in such material shows more disorder than that found in high-quality polycrystalline films. C1 MIT, DEPT CHEM ENGN, CAMBRIDGE, MA 02139 USA. GEOCENTERS INC, FT WASHINGTON, MD 20744 USA. USN, RES LAB, GAS SURFACE DYNAM SECT, WASHINGTON, DC 20375 USA. RI Gleason, Karen/G-1471-2013 OI Gleason, Karen/0000-0001-6127-1056 NR 44 TC 32 Z9 33 U1 0 U2 9 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD DEC 3 PY 1992 VL 1 IS 12 BP 1145 EP 1155 DI 10.1016/0925-9635(92)90088-6 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA KF856 UT WOS:A1992KF85600002 ER PT J AU BRENNER, DW HARRISON, JA AF BRENNER, DW HARRISON, JA TI ATOMISTIC SIMULATIONS OF DIAMOND FILMS SO AMERICAN CERAMIC SOCIETY BULLETIN LA English DT Article ID SURFACE; DEPOSITION; DYNAMICS; MODEL AB Molecular dynamics simulations with a theoretical model are being used to explore several aspects of the atomic-scale properties of diamond films. In particular, research has been directed at understanding both the static structure and the dynamic reactivity of diamond films and how these relate to growth and atomistic mechanical properties. RP BRENNER, DW (reprint author), USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 22 TC 20 Z9 20 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7812 J9 AM CERAM SOC BULL JI Am. Ceram. Soc. Bull. PD DEC PY 1992 VL 71 IS 12 BP 1821 EP 1828 PG 8 WC Materials Science, Ceramics SC Materials Science GA KB777 UT WOS:A1992KB77700012 ER PT J AU LEWIS, DW AF LEWIS, DW TI WHAT WAS WRONG WITH TINY-TIM SO AMERICAN JOURNAL OF DISEASES OF CHILDREN LA English DT Article ID RENAL TUBULAR-ACIDOSIS AB One of the most endearing characters in English literature is Tiny Tim, the crippled son of Ebenezer Scrooge's clerk, Bob Cratchit. Yet the nature of Tiny Tim's multifaceted and implicitly reversible illness is a mystery and open to debate and speculation. From details of the original manuscript and the eight film versions, it is possible to construct a differential diagnosis for Tim's short stature, asymmetric crippling disorder, and curious intermittent weakness that would lead to his death, if untreated, within a period of 1 year. Following the ghostly visitations, Scrooge vows to assist the struggling Cratchit family financially, thereby making available the best medical care money could buy. From review of pediatrics texts from 1830 to 1850, a recommended treatment plan would have included (1) general measures such as country air and exercise, and fish oils such as cod and halibut (vitamin D), and (2) specific treatments of tonics (containing combinations of belladonna, opium, sodium bicarbonate, sodium citrate, and potassium chloride) emphasizing alkalis, and splinting and bracing the limbs. Such treatments with vitamin D and alkalinization with sodium bicarbonate and sodium citrate suggest the plausible speculation that Tiny Tim had renal tubular acidosis (type I), a disorder that is characterized by growth failure and, if left untreated, complicated by osteomalacia with pathologic fractures, hypokalemic muscle weakness and periodic paralysis, nephrocalcinosis leading to renal failure, and death. I propose that Tiny Tim had distal renal tubular acidosis (type I). C1 USN HOSP,DEPT PEDIAT NEUROL,PORTSMOUTH,VA. MED COLL HAMPTON ROADS,DEPT PEDIAT,NORFOLK,VA. MED COLL HAMPTON ROADS,DEPT NEUROL,NORFOLK,VA. NR 27 TC 14 Z9 14 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0002-922X J9 AM J DIS CHILD JI Am. J. Dis. Child. PD DEC PY 1992 VL 146 IS 12 BP 1403 EP 1407 PG 5 WC Pediatrics SC Pediatrics GA KC118 UT WOS:A1992KC11800001 PM 1340779 ER PT J AU ENGLEBERG, NC LOMBARDI, DP AF ENGLEBERG, NC LOMBARDI, DP TI LOW-FREQUENCY OF ANAEROBIC BACTEREMIA - REPLY SO AMERICAN JOURNAL OF MEDICINE LA English DT Letter C1 USN HOSP,BETHESDA,MD 20814. RP ENGLEBERG, NC (reprint author), UNIV MICHIGAN,SCH MED,ANN ARBOR,MI 48104, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0002-9343 J9 AM J MED JI Am. J. Med. PD DEC PY 1992 VL 93 IS 6 BP 707 EP 707 DI 10.1016/0002-9343(92)90215-W PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA KB774 UT WOS:A1992KB77400027 ER PT J AU ROBSON, AE SETHIAN, JD AF ROBSON, AE SETHIAN, JD TI RAILGUN RECOIL, AMPERE TENSION, AND THE LAWS OF ELECTRODYNAMICS SO AMERICAN JOURNAL OF PHYSICS LA English DT Article ID ELECTRIC CONDUCTORS; LORENTZ FORCES; BIOT-SAVART; EQUIVALENCE; EXPLOSIONS; RELATIVITY; CURRENTS AB There has recently been a revival of an old controversy over whether Ampere's original law of force between current elements is to be preferred over the more familiar and universally used Biot-Savart-Lorentz law. Although it is agreed that the two laws give identical results when used to calculate the force between two circuits, it has been claimed that if Ampere's law is applied to the action of a circuit upon part of itself it predicts internal longitudinal forces that are excluded by Biot-Savart-Lorentz. The existence of longitudinal forces has been inferred from observations of the buckling of the rails in a railgun, attributed to compressive stress, and the fracture of long wires subjected to pulsed currents, attributed to "Ampere tension." An experiment has been performed that should provide an unambiguous demonstration of this longitudinal force, if it exists. The apparatus consisted of a rigid coaxial circuit in which an unsymmetrical section of the center conductor was free to move in the axial direction under the influence of the longitudinal force. Pulsed currents of up to 100 kA were passed through the circuit but no evidence of a longitudinal force was found. It is shown that this result is consistent with Ampere's force law, and that claims that the law predicts longitudinal forces are based on the incomplete application of the law. RP ROBSON, AE (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 32 TC 14 Z9 14 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD DEC PY 1992 VL 60 IS 12 BP 1111 EP 1117 DI 10.1119/1.16956 PG 7 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA JZ242 UT WOS:A1992JZ24200007 ER PT J AU MANGOLD, BL DEAN, DA AF MANGOLD, BL DEAN, DA TI THE ROLE OF IGG ANTIBODIES FROM IRRADIATED CERCARIA-IMMUNIZED RABBITS IN THE PASSIVE TRANSFER OF IMMUNITY TO SCHISTOSOMA MANSONI-INFECTED MICE SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID PROTECTIVE MONOCLONAL-ANTIBODIES; P-STRAIN MICE; INDUCED RESISTANCE; RESPONSES; ELIMINATION; MIGRATION; INVIVO; SERUM; RATS; MECHANISMS AB Antibodies of the IgG subclass isolated from the sera of rabbits immunized with cercariae subjected to 50 kilorads of gamma irradiation passively provided partial immunity against Schistosoma mansoni challenge in C57B1/6J mice. These mice exhibited reductions in adult worm burdens of 43-61 % compared with recipients of normal rabbit antibodies. Passively transferred IgG antibodies were most effective when given 4-7-days postchallenge; they were less effective when given just before challenge, and were totally ineffective when given 15 days postchallenge. It was also shown that the Fc portion of the IgG molecule was important for passive transfer of immunity. Finally, we observed that although some antibodies from irradiated cercaria-immunized rabbits recognized keyhole limpet hemocyanin (KLH), these KLH cross-reacting antibodies were not necessary for successful passive transfer of immunity. Antibodies from a KLH-immunized rabbit also failed to passively protect mice. RP MANGOLD, BL (reprint author), USN,MED RES UNIT 3,PSC 452 BOX 5000,FPO AE 09835-0007,CAIRO,EGYPT. NR 32 TC 20 Z9 21 U1 1 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 1992 VL 47 IS 6 BP 821 EP 829 PG 9 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA KF920 UT WOS:A1992KF92000015 PM 1471741 ER PT J AU JONES, TR YUAN, LF MARWOTO, HA GORDON, DM WIRTZ, RA HOFFMAN, SL AF JONES, TR YUAN, LF MARWOTO, HA GORDON, DM WIRTZ, RA HOFFMAN, SL TI LOW IMMUNOGENICITY OF A PLASMODIUM-VIVAX CIRCUMSPOROZOITE PROTEIN EPITOPE BOUND BY A PROTECTIVE MONOCLONAL-ANTIBODY SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID IMMUNODOMINANT EPITOPE; SPOROZOITE VACCINE; MALARIA VACCINE; FALCIPARUM; SEQUENCE; SAFETY AB The repeat region of the Plasmodium vivax circumsporozoite (CS) protein contains 20 copies of the nine-amino acid sequence DRA A/D GQPAG. A monoclonal antibody that passively protects monkeys against sporozoite challenge recognizes a four-amino acid linear sequence AGDR included within this nonamer, but when monkeys were immunized with a vaccine, NS1(81)V20, which contains 20 copies of the nonamer, they failed to produce antibodies to AGDR. To determine if natural exposure to sporozoites induces antibodies to AGDR, we tested sera from 176 individuals from a malaria-endemic area in Flores, Indonesia. Seventy-one percent of the adults had antibodies to the P. vivax repeat region; only 18% had detectable antibodies to AGDR. None of the subjects had antibodies to the P. vivax variant repeat ANGAGNQPG. We next tested sera from six human volunteers immunized with NS1(81)V20 and found that the vaccine, despite inducing antibodies against the nonamer, as it did in the monkeys, did not induce antibodies against AGDR. To further test our ability to raise anti-AGDR antibodies using synthetic peptides, we immunized Aotus monkeys and BALB/c mice with AGDR. Sera from the mice reacted strongly with both AGDR and a recombinant protein containing the 20 copies of the nonamer. Sera from the monkeys reacted only minimally with a protein (VIVAX-1) that contains monomeric AGDR within its sequence. Sera from the mice also bound air-dried P. vivax sporozoites, while sera from the monkeys did not. These data indicate that natural exposure induces very low levels of antibodies to the CS protein epitope AGDR, and that polyclonal antibodies that recognize native CS protein can be induced experimentally with a synthetic AGDR peptide. C1 NATL INST HLTH RES & DEV,JAKARTA,INDONESIA. WALTER REED ARMY INST RES,WASHINGTON,DC 20307. RP JONES, TR (reprint author), USN,MED RES INST,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. NR 15 TC 11 Z9 11 U1 0 U2 1 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD DEC PY 1992 VL 47 IS 6 BP 837 EP 843 PG 7 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA KF920 UT WOS:A1992KF92000017 PM 1471743 ER PT J AU TURNER, PR AF TURNER, PR TI A HISTORY OF THE LORDS OF NUMBER-CRUNCHING SO AMERICAN MATHEMATICAL MONTHLY LA English DT Article ID INDEX RP TURNER, PR (reprint author), USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU MATHEMATICAL ASSOC AMER PI WASHINGTON PA 1529 18TH STREET NW, WASHINGTON, DC 20036 SN 0002-9890 J9 AM MATH MON JI Am. Math. Mon. PD DEC PY 1992 VL 99 IS 10 BP 907 EP 916 DI 10.2307/2324482 PG 10 WC Mathematics SC Mathematics GA JZ705 UT WOS:A1992JZ70500001 ER PT J AU HULLANDER, RM BOGARD, TD LEIVERS, D MORAN, D DEWAN, DM AF HULLANDER, RM BOGARD, TD LEIVERS, D MORAN, D DEWAN, DM TI CHIARI-I MALFORMATION PRESENTING AS RECURRENT SPINAL HEADACHE SO ANESTHESIA AND ANALGESIA LA English DT Note ID CORTICAL VEIN-THROMBOSIS; SYRINGOMYELIA C1 USN HOSP,DEPT ANAESTHESIOL,SAN DIEGO,CA 92134. WAKE FOREST UNIV,BOWMAN GRAY SCH MED,DEPT ANESTHESIOL,WINSTON SALEM,NC 27103. RP HULLANDER, RM (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 12 TC 18 Z9 20 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD DEC PY 1992 VL 75 IS 6 BP 1025 EP 1026 PG 2 WC Anesthesiology SC Anesthesiology GA LW647 UT WOS:A1992LW64700026 PM 1443683 ER PT J AU MARCHYWKA, M SOCKER, DG AF MARCHYWKA, M SOCKER, DG TI MODULATION TRANSFER-FUNCTION MEASUREMENT TECHNIQUE FOR SMALL-PIXEL DETECTORS SO APPLIED OPTICS LA English DT Article DE MODULATION TRANSFER FUNCTION; SPATIAL RESOLUTION; CHARGE COUPLED DEVICE ID ELECTROOPTICAL HARDWARE CONSIDERATIONS; CHARGE-COUPLED-DEVICES; IMAGING CAPABILITY; IMAGERS AB A modulation transfer function (MTF) measurement technique suitable for large-format, small-pixel detector characterization has been investigated. A volume interference grating is used as a test image instead of the bar or sine wave target images normally used. This technique permits a high-contrast, large-area, sinusoidal intensity distribution to illuminate the device being tested, avoiding the need to deconvolve raw data with imaging system characteristics. A high-confidence MTF result at spatial frequencies near 200 cycles/mm is obtained. We present results at several visible light wavelengths with a 6.8-mum-pixel CCD. Pixel response functions are derived from the MTF results. RP MARCHYWKA, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 26 TC 36 Z9 37 U1 0 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 DEC 1 PY 1992 VL 31 IS 34 BP 7198 EP 7213 PG 16 WC Optics SC Optics GA JZ714 UT WOS:A1992JZ71400008 PM 20802584 ER PT J AU SEELY, JF HUNTER, WR RIFE, JC KOWALSKI, MP AF SEELY, JF HUNTER, WR RIFE, JC KOWALSKI, MP TI OPTICAL-CONSTANTS OF THIN SILICON FILMS NEAR THE SILICON L2,3 ABSORPTION-EDGE SO APPLIED OPTICS LA English DT Article ID GRATING-CRYSTAL MONOCHROMATOR; PERFORMANCE AB Using synchrotron radiation, we determined the optical constants of thin silicon films in the wavelength region near the silicon L2,3 absorption edge. The extinction coefficient was determined from the transmittance of a thin, unbacked silicon film. The refractive index was determined from the reflectance of a sample consisting of an evaporated silicon film on gold. The thickness of the evaporated silicon film was chosen so that an interference feature appeared in the wavelength region above the edge where the silicon is transmissive. The shape of the interference feature is sensitive to the optical constants of silicon near the edge. C1 SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785. RP SEELY, JF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD DEC 1 PY 1992 VL 31 IS 34 BP 7367 EP 7370 PG 4 WC Optics SC Optics GA JZ714 UT WOS:A1992JZ71400032 PM 20802608 ER PT J AU GULEVICH, SJ KALMIJN, JA THAL, LJ IRAGUIMADOZ, V MCCUTCHAN, JA KENNEDY, C GRANT, I AF GULEVICH, SJ KALMIJN, JA THAL, LJ IRAGUIMADOZ, V MCCUTCHAN, JA KENNEDY, C GRANT, I TI SENSORY TESTING IN HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 INFECTED MEN SO ARCHIVES OF NEUROLOGY LA English DT Article ID HIV INFECTION; NEUROPATHY; AIDS; SPECTRUM AB Patients with acquired immunodeficiency syndrome frequently suffer peripheral neuropathy. We investigated its prevalence and relationship to clinical stage of human immunodeficiency virus (HIV) infection using quantitative sensory testing and nerve conduction testing. Vibratory threshold was determined in the right great toe and index finger of 179 men seropositive for HIV (28 with acquired immunodeficiency syndrome [AIDS] or AIDS-related complex [ARC], 151 asymptomatic) and 32 HIV-seronegative controls. None had clinical peripheral neuropathy. Abnormal threshold was control mean plus 2.5 SDs. In the toe, 10 (36%) of 28 subjects with AIDS or ARC had abnormal vibratory thresholds, compared with seven (5%) of 151 asymptomatic seropositive subjects and none of 32 controls. A subgroup of 168 seropositive subjects underwent nerve conduction testing. Abnormality rates were similar, but abnormalities of nerve conduction coincided with quantitative sensory testing abnormalities in only half the cases. Mean (+/-SD) vibratory threshold was significantly greater in subjects with AIDS or ARC (3.00+/-0.51 vibratory units) than in asymptomatic subjects (1.56+/-0.27 vibratory units) and controls (1.63+/-0.54 vibratory units). Finger abnormality rates did not differ, although subjects with AIDS or ARC had greater mean vibratory threshold. Subclinical peripheral neuropathy is thus related to stage of HIV infection and is present by quantitative sensory testing in 36% of patients with AIDS or ARC. C1 UNIV CALIF SAN DIEGO,SCH MED,DEPT NEUROSCI,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,SCH MED,DEPT MED,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,SCH MED,DEPT PSYCHIAT,LA JOLLA,CA 92093. VET ADM MED CTR,SAN DIEGO,CA. USN HOSP,SAN DIEGO,CA 92134. FU NIMH NIH HHS [R01 MH45688, 5 P50 MH45294, 5 R01 MH43298] NR 17 TC 16 Z9 16 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-9942 J9 ARCH NEUROL-CHICAGO JI Arch. Neurol. PD DEC PY 1992 VL 49 IS 12 BP 1281 EP 1284 PG 4 WC Clinical Neurology SC Neurosciences & Neurology GA KA933 UT WOS:A1992KA93300014 PM 1360202 ER PT J AU WEINRICH, JD GRANT, I JACOBSON, DL ROBINSON, SR MCCUTCHAN, JA GRANT, I ATKINSON, JH WEINRICH, JD CHANDLER, JL MALONE, JL KENNEDY, CA MCCUTCHAN, JA SPECTOR, SA THAL, L HEATON, RK HESSELINK, J JERNIGAN, T WILEY, CA OLSHEN, R ABRAMSON, I BUTTERS, N DUPONT, R PATTERSON, T ZISOOK, S JESTE, D SIEBURG, H AF WEINRICH, JD GRANT, I JACOBSON, DL ROBINSON, SR MCCUTCHAN, JA GRANT, I ATKINSON, JH WEINRICH, JD CHANDLER, JL MALONE, JL KENNEDY, CA MCCUTCHAN, JA SPECTOR, SA THAL, L HEATON, RK HESSELINK, J JERNIGAN, T WILEY, CA OLSHEN, R ABRAMSON, I BUTTERS, N DUPONT, R PATTERSON, T ZISOOK, S JESTE, D SIEBURG, H TI EFFECTS OF RECALLED CHILDHOOD GENDER NONCONFORMITY ON ADULT GENITOEROTIC ROLE AND AIDS EXPOSURE SO ARCHIVES OF SEXUAL BEHAVIOR LA English DT Article AB The connections between childhood gender nonconformity (assessed by the Freund Feminine Gender Identity Scale, or FGI) and adult genitoerotic role (assessed by a sex history) were examined. The core sample was a group of 106 men who had sex with other men before 1980 and who are currently enrolled in two longitudinal studies of AIDS. Although other workers have cautioned against assuming a priori that childhood gender role is inherently related to adult preferences for particular sexual acts, our data suggest that there is at least a statistical association between these two concepts. In particular, the FGI (and many of its factors and items) are significantly associated with preferences for receptive anal intercourse and, less clearly, with oral-anal contact - but not with oral-genital intercourse or insertive anal intercourse. Suggestions for AIDS prevention and safe-sex awareness are made on the basis of these findings. The data also suggest that in sex research involving homosexual men, the correct genitoerotic role distinction is not insertive vs. receptive behaviors, or even insertive vs. receptive anal intercourse, but receptive anal intercourse vs. all other behaviors. C1 USN HOSP,HIV NEUROBEHAV RES CTR GRP,SAN DIEGO,CA 92134. VET ADM MED CTR,HIV NEUROBEHAV RES CTR GRP,SAN DIEGO,CA 92161. RP WEINRICH, JD (reprint author), UNIV CALIF SAN DIEGO,HIV NEUROBEHAV RES CTR GRP,2760 5TH AVE 200,SAN DIEGO,CA 92103, USA. FU NIMH NIH HHS [5 R01 MH 43298, 5 P50 MH45294, 5 R29 MH45688] NR 16 TC 23 Z9 24 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0004-0002 J9 ARCH SEX BEHAV JI Arch. Sex. Behav. PD DEC PY 1992 VL 21 IS 6 BP 559 EP 585 DI 10.1007/BF01542256 PG 27 WC Psychology, Clinical; Social Sciences, Interdisciplinary SC Psychology; Social Sciences - Other Topics GA KB226 UT WOS:A1992KB22600004 PM 1482281 ER PT J AU KEARL, CE NELSON, A AF KEARL, CE NELSON, A TI THE ARMY DELAYED ENTRY PROGRAM SO ARMED FORCES & SOCIETY LA English DT Article AB The Delayed Entry Program, which allows individuals to delay reporting for active duty up to 12 months after signing enlistment contracts, is a valuable management tool used by the U.S. Army Recruiting Command and other U.S. military recruiting organizations. Attrition from this program increases recruiting costs and reduces training efficiency. DEP attrition is analyzed here using microdata for individuals who signed Army enlistment contracts during fiscal years 1986 and 1987. The findings indicate that the strongest predictors of DEP attrition are related to personal characteristics. Being younger, male, black, a high school graduate, and having dependents reduces the likelihood a recruit will be a DEP loss. Economic factors also influence DEP loss. The results suggest that as the economy becomes stronger, DEP loss is more prevalent. Increasing recruiting incentives result in small, but significant, reductions in the probability of DEP loss. The findings also indicate longer DEP terms increase DEP attrition. C1 USA,RES INST,5001 EISENHOWER AVE,ALEXANDRIA,VA 22333. USN,RECRUITING COMMAND,WASHINGTON,DC 20350. UNIV MARYLAND,COLLEGE PK,MD 20742. NR 11 TC 1 Z9 1 U1 1 U2 1 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD WIN PY 1992 VL 18 IS 2 BP 253 EP 268 DI 10.1177/0095327X9201800206 PG 16 WC Political Science; Sociology SC Government & Law; Sociology GA HG163 UT WOS:A1992HG16300006 ER PT J AU GARRETT, SL HOFLER, TJ AF GARRETT, SL HOFLER, TJ TI THERMOACOUSTIC REFRIGERATION SO ASHRAE JOURNAL-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR-CONDITIONING ENGINEERS LA English DT Article RP GARRETT, SL (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 0 TC 5 Z9 7 U1 1 U2 2 PU AMER SOC HEAT REFRIG AIR- CONDITIONING ENG INC PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 SN 0001-2491 J9 ASHRAE J JI ASHRAE J.-Am. Soc. Heat Refrig. Air-Cond. Eng. PD DEC PY 1992 VL 34 IS 12 BP 28 EP & PG 0 WC Thermodynamics; Construction & Building Technology; Engineering, Mechanical SC Thermodynamics; Construction & Building Technology; Engineering GA KC161 UT WOS:A1992KC16100009 ER PT J AU ARMSTRONG, JT HUMMEL, CA QUIRRENBACH, A BUSCHER, DF MOZURKEWICH, D VIVEKANAND, M SIMON, RS DENISON, CS JOHNSTON, KJ PAN, XP SHAO, M COLAVITA, MM AF ARMSTRONG, JT HUMMEL, CA QUIRRENBACH, A BUSCHER, DF MOZURKEWICH, D VIVEKANAND, M SIMON, RS DENISON, CS JOHNSTON, KJ PAN, XP SHAO, M COLAVITA, MM TI THE ORBIT OF PHI-CYGNI MEASURED WITH LONG-BASE-LINE OPTICAL INTERFEROMETRY - COMPONENT MASSES AND ABSOLUTE MAGNITUDES SO ASTRONOMICAL JOURNAL LA English DT Article ID STARS AB We present the orbit of the double-lined spectroscopic binary phi Cygni, the distance to the system, and the masses and absolute magnitudes of its components. The apparent orbit is based on our observations with the Mark III Optical Interferometer, the distance (80.8+/-1.8 pc) and component masses (2.54 +/-0.09 M. and 2.44+/-0.08 M., in agreement with the previous determination by McAlister [AJ, 101, 2207 (1982)]) are based on the Mark III data combined with a reinterpretation of the spectroscopic data of Rach & Herbig [ApJ, 133, 143 (1961)], and the absolute V magnitudes (0.77m+/-0.1m and 1.07m+/-0.1m) are derived from the distance, the cataloged integrated magnitude, and the magnitude difference from spectroscopic data. From a comparison of M(V) and (B-V) with the isochrones of Maeder & Meynet [A&AS 89, 451 (1991)], both components have undergone He ignition. C1 CALTECH,DEPT ASTRON,PASADENA,CA 91125. JET PROP LAB,PASADENA,CA 91109. USRA,WASHINGTON OFF CTR,WASHINGTON,DC 20024. RP ARMSTRONG, JT (reprint author), USNO,NRL,OPT INTERFEROMETER PROJECT,3450 & MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 20 TC 27 Z9 27 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 DEC PY 1992 VL 104 IS 6 BP 2217 EP 2223 DI 10.1086/116396 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JZ639 UT WOS:A1992JZ63900016 ER PT J AU HILTON, JL SEIDELMANN, PK LIU, CY AF HILTON, JL SEIDELMANN, PK LIU, CY TI AN EXAMINATION OF THE CHANGE IN THE EARTHS ROTATION RATE FROM ANCIENT CHINESE OBSERVATIONS OF LUNAR OCCULTATIONS OF THE PLANETS SO ASTRONOMICAL JOURNAL LA English DT Article AB A study is made of fifty-eight records of naked eye observations of occultations of the planets by the Moon chosen from the Chinese dynastic histories. These records cover the period from 68 B.C. to 575 A.D. Fifty-three of these records fall in the time period between 100 A.D. and 575 A.D., a period with no other known observations useful for Earth rotation studies. The observations are compared to topocentric ephemerides computed using Bretagnon's planetary theories VSOP82 and the Chapront-Touze lunar theory ELP2000-85. The area of the Earth from which an individual lunar occultation is observable is too large to produce a useful value of the acceleration parameter, C (Ct2=ET-UT), from untimed occultation records. However, the entire series of observation records produces a weak estimate for the value of C (12.6 s cy-2 to 35.7 s cy-2). The uncertainty in C is difficult to estimate. Overall, the check on the change in the rotation rate is very weak, but it represents the limit of what can be done with known, untimed occultation records. C1 SHAANXI ASTRON OBSERV,SHAANXI,PEOPLES R CHINA. RP HILTON, JL (reprint author), USN OBSERV,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 7 TC 3 Z9 4 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 DEC PY 1992 VL 104 IS 6 BP 2250 EP 2252 DI 10.1086/116401 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JZ639 UT WOS:A1992JZ63900021 ER PT J AU HUMMEL, CA MUXLOW, TWB KRICHBAUM, TP QUIRRENBACH, A SCHALINSKI, CJ WITZEL, A JOHNSTON, KJ AF HUMMEL, CA MUXLOW, TWB KRICHBAUM, TP QUIRRENBACH, A SCHALINSKI, CJ WITZEL, A JOHNSTON, KJ TI MERLIN AND VLBI OBSERVATIONS OF THE QUASAR 0836+710 - MORPHOLOGY OF A PARSEC KILOPARSEC SCALE JET SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE QUASARS, INDIVIDUAL, 0836+710; TECHNIQUES; INTERFEROMETRIC ID EXTRAGALACTIC RADIO-SOURCES; SHOCKS; 3C-120 AB The quasar 0836 + 710 (4C 71.07, z = 2.16, S1.7 GHz = 3.6 Jy) was observed at 1.7 GHz for 19 h simultaneously with a 16-station VLBI array and the 7-station MERLIN array. The bright and pronounced one-sided jet emerging from the core, which has been reported by Krichbaum et al. A&A 230, 271 (1990) to contain stationary and superluminally moving components, has been mapped with 3 milliarcsecond (mas) resolution over its total visible length of 130 mas at a dynamic range of 1000 to 1. On these scales, the jet displays smooth bending, as well as a regular kink pattern, possibly due to magneto-hydrodynamic instabilities. On larger scales, 0836 + 710 displays a diffuse secondary component aligned with the jet component located 1.3 arcseconds from the core. However, no emission could be found between the pc-scale structure and the diffuse component at a level of 1 mJy per beam, with a beam of 0.22 arcseconds. The secondary component has been mapped with 50 mas resolution using the combined VLBI and MERLIN data. The emission appears to be very diffuse, displaying no dominant hot spot. Here the jet pressure may have declined to match the ambient pressure, thus leading to a loss of confinement of the jet and the subsequent formation of diffuse emission. C1 JODRELL BANK, NUFFIELD RADIO ASTRON LABS, MACCLESFIELD SK11 9DL, CHESHIRE, ENGLAND. USN OBSERV, NRL USNO OPT INTERFEROMETER PROJECT, WASHINGTON, DC 20392 USA. USN OBSERV, UNIV SPACE RES ASSOC, WASHINGTON, DC 20392 USA. USN, RES LAB, CTR ADV SPACE SENSING, WASHINGTON, DC 20375 USA. RP HUMMEL, CA (reprint author), MAX PLANCK INST RADIOASTRON, AUF HUGEL 69, W-5300 BONN 1, GERMANY. NR 23 TC 34 Z9 34 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD DEC PY 1992 VL 266 IS 1 BP 93 EP 100 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KA695 UT WOS:A1992KA69500014 ER PT J AU HOLMAN, GD BENKA, SG AF HOLMAN, GD BENKA, SG TI A HYBRID THERMAL NONTHERMAL MODEL FOR THE ENERGETIC EMISSIONS FROM SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCELERATION OF PARTICLES; PLASMAS; SUN, FLARES; SUN, X-RAYS ID RUNAWAY ELECTRONS; X-RAY; ACCELERATION AB We present an alternative interpretation of the high-resolution solar flare spectra obtained in 1981 by Lin et al. In our interpretation electron heating and acceleration are simultaneous and physically linked, rather than heating being a secondary effect of particle acceleration. We show that the observed properties of solar flare X-ray emission can in general be explained through the Joule heating and electric field acceleration of runaway electrons in current channels. We have fitted a hybrid thermal/nonthermal electron distribution, consisting of hot isothermal electrons with a nonthermal tail of runaway electrons, to representative spectra obtained by Lin et al. The hybrid model relaxes the electron number and energy flux requirements for the hard X-ray emission over those of a purely nonthermal model. The low-energy "cutoff" to the nonthermal part of the X-ray spectrum is determined by the critical velocity in the electron distribution above which runaway acceleration occurs. We relate the fit parameters to the physical properties (such as the electric field strength in the current channels of the acceleration region. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP NASA, GODDARD SPACE FLIGHT CTR, ASTRON & SOLAR PHYS LAB, GREENBELT, MD 20771 USA. RI Holman, Gordon/C-9548-2012 NR 25 TC 50 Z9 53 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD DEC 1 PY 1992 VL 400 IS 2 BP L79 EP L82 DI 10.1086/186654 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JY439 UT WOS:A1992JY43900010 ER PT J AU ANDERSON, GP AF ANDERSON, GP TI PATHOPHYSIOLOGY OF HEPARIN-INDUCED THROMBOCYTOPENIA - REPLY SO BRITISH JOURNAL OF HAEMATOLOGY LA English DT Letter RP ANDERSON, GP (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. RI Anderson, George/D-2461-2011 OI Anderson, George/0000-0001-7545-9893 NR 0 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0007-1048 J9 BRIT J HAEMATOL JI Br. J. Haematol. PD DEC PY 1992 VL 82 IS 4 BP 779 EP 779 DI 10.1111/j.1365-2141.1992.tb06964.x PG 1 WC Hematology SC Hematology GA KD005 UT WOS:A1992KD00500028 ER PT J AU Davies, ME Abalakin, VK Brahic, A Bursa, M Chovitz, BH Lieske, JH Seidelmann, RK Sinclair, AT Tjuflin, YS AF Davies, M. E. Abalakin, V. K. Brahic, A. Bursa, M. Chovitz, B. H. Lieske, J. H. Seidelmann, R. K. Sinclair, A. T. Tjuflin, Y. S. TI REPORT OF THE IAU/IAG/COSPAR WORKING GROUP ON CARTOGRAPHIC COORDINATES AND ROTATIONAL ELEMENTS OF THE PLANETS AND SATELLITES: 1991 SO CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY LA English DT Article DE Cartographic coordinates; rotation axes; rotation periods; sizes and shapes AB Every three years the IAU/IAG/COSPAR Working Group on Cartographic Coordinates and Rotational Elements of the Planets and Satellites revises tables giving the directions of the north poles of rotation and the prime meridians of the planets and satellites. Also presented are revised tables giving their sizes and shapes. C1 [Davies, M. E.] RAND Corp, Santa Monica, CA USA. [Abalakin, V. K.] Inst Theoret Astron, St Petersburg, Russia. [Brahic, A.] Observ Paris, Meudon, France. [Bursa, M.] Astron Inst, Prague, Czech Republic. [Chovitz, B. H.] STX, Lanham, MD USA. [Lieske, J. H.] CALTECH, Jet Prop Lab, Pasadena, CA USA. [Seidelmann, R. K.] USN Observ, Washington, DC 20392 USA. [Sinclair, A. T.] Royal Greenwich Observ, Cambridge CB3 0EZ, England. [Tjuflin, Y. S.] Cent Res Inst Geodesy Air Survey & Mapping TsNIIG, Moscow, Russia. RP Davies, ME (reprint author), RAND Corp, Santa Monica, CA USA. NR 14 TC 71 Z9 71 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0923-2958 J9 CELEST MECH DYN ASTR JI Celest. Mech. Dyn. Astron. PD DEC PY 1992 VL 53 IS 4 BP 377 EP 397 PG 21 WC Astronomy & Astrophysics; Mathematics, Interdisciplinary Applications SC Astronomy & Astrophysics; Mathematics GA V05NA UT WOS:000207131500006 ER PT J AU MICHIDA, T KYUHARA, M NISHIYAMA, M YOSHIMI, Y FITZGERALD, JP SAYO, H AF MICHIDA, T KYUHARA, M NISHIYAMA, M YOSHIMI, Y FITZGERALD, JP SAYO, H TI SYNTHESIS AND CHARACTERIZATION OF PICNIC-BASKET PORPHYRINS WITH A SUBSTITUENT IN THE INTERIOR OF THE POCKET SO CHEMICAL & PHARMACEUTICAL BULLETIN LA English DT Article DE PORPHYRIN; COBALT PORPHYRIN; DIOXYGEN CARRIER; ESR; SYNTHESIS; HYDROGEN-BONDING; BASE-BINDING ID COBALT(II) CAPPED PORPHYRINS; OXYGEN; DIOXYGEN; BINDING; IRON(II); MODELS AB ''Picnic-basket'' porphyrins of a new type, that have a substituent in the interior of the pocket, were synthesized to study stabilization of the bound oxygen in hemoprotein models. Though these Co(II) porphyrins have enormous equilibrium constants for the formation of base adducts, hydrogen-bonding interaction with coordinated dioxygen is not as effective for stabilization of the metal-dioxygen bond as we had expected. The results suggest that doming of the porphyrin plane plays an important role in the binding of dioxygen. C1 USN ACAD, DEPT CHEM, ANNAPOLIS, MD 21402 USA. RP MICHIDA, T (reprint author), KOBE GAKUIN UNIV, FAC PHARMACEUT SCI, IKAWADANI CHO, NISHI KU, KOBE 65121, JAPAN. NR 16 TC 3 Z9 3 U1 0 U2 0 PU PHARMACEUTICAL SOC JAPAN PI TOKYO PA 2-12-15 SHIBUYA, SHIBUYA-KU, TOKYO, 150-0002, JAPAN SN 0009-2363 J9 CHEM PHARM BULL JI Chem. Pharm. Bull. PD DEC PY 1992 VL 40 IS 12 BP 3157 EP 3162 PG 6 WC Chemistry, Medicinal; Chemistry, Multidisciplinary; Pharmacology & Pharmacy SC Pharmacology & Pharmacy; Chemistry GA KH957 UT WOS:A1992KH95700006 ER PT J AU SINGH, A MARKOWITZ, MA TSAO, LI AF SINGH, A MARKOWITZ, MA TSAO, LI TI MODULATION OF BILAYER STRUCTURES DERIVED FROM DIACETYLENIC PHOSPHOCHOLINES CONTAINING OXYGEN LINKER -BETA TO DIACETYLENE SO CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Article DE DIACETYLENIC PHOSPHOLIPIDS; LIPOSOMES; TUBULES; BILAYER MODULATION; BETA-OXYDIACETYLENIC ACID; LANGMUIR FILM; CALORIMETRY; COOPERATIVE UNIT; OPTICAL MICROSCOPY; ELECTRON MICROSCOPY ID TUBULAR MICROSTRUCTURES; LIPID BILAYERS; PHOSPHATIDYLCHOLINES; TRANSITION; VESICLES; MODEL AB Phospholipids with diacetylenes present in the acyl chains form tubules and helices in aqueous dispersions. In order to modulate the morphology of bilayer structures and to understand the role of diacetylene in lipid-bilayer assembly, two diacetylenic phosphocholines, 1,2-bis(9,16-dioxa-hexacosa-11,13-diynoyl)-sn-3-phosphocholine and 1,2-bis(15-oxa-pentacosa-10,12-diynoyl)-sn-3-phosphocholine, in which the diacetylene is linked to the acyl chain by an oxygen spacer have been synthesized. Lipid dispersions were characterized by calorimetric, film balance and microscopic techniques. Placement of oxygen spacer influences the morphology of the bilayer assemblies formed in aqueous solution. When both ends of the diacetylene were linked to the acyl chain by oxygen atoms, liposomes (diameters ranging from 0.3-3.4 mum) were observed by optical microscopy. Linking only the terminal portion of the acyl chain to the diacetylene with an oxygen atom resulted in a lipid which formed tubular microstructures as well as vesicles. Diameter of the tubular structures ranged from 0.4-4.7 mum. Transmission electron microscopic (TEM) analysis of replicas of a freeze fractured sample of the dispersion revealed that the tubular structures were hollow cylinders consisting of an aqueous core surrounded by a wall of lipid. RP SINGH, A (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 32 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-3084 J9 CHEM PHYS LIPIDS JI Chem. Phys. Lipids PD DEC PY 1992 VL 63 IS 3 BP 191 EP 201 DI 10.1016/0009-3084(92)90035-N PG 11 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA KH439 UT WOS:A1992KH43900004 PM 1493614 ER PT J AU BROOK, I FRAZIER, EH THOMPSON, DH AF BROOK, I FRAZIER, EH THOMPSON, DH TI AEROBIC AND ANAEROBIC MICROBIOLOGY OF EXTERNAL OTITIS SO CLINICAL INFECTIOUS DISEASES LA English DT Article ID BACTERIOLOGY; BACTEROIDES; MEDIA AB Microbiological and clinical data from 46 patients with external otitis were retrospectively evaluated. Specimens were processed for isolation of aerobic and anaerobic bacteria. A total of 42 aerobic bacteria, 22 anaerobic bacteria, and 3 Candida albicans organisms were recovered. Aerobic bacteria only were isolated from 31 patients (67%), anaerobic bacteria only were isolated from 8 (17%), and mixed aerobic and anaerobic bacteria were isolated from 4 (9%). C albicans alone was recovered from two patients (4%), and the organism was mixed with aerobic bacteria in one case (2%). The most common isolates were Pseudomonas aeruginosa (19 instances), Peptostreptococcus species (11), Staphylococcus aureus (7), and Bacteroides species (5). One isolate was recovered from 30 patients (65%), 2 isolates were recovered from 11 (24%), and 3 isolates were recovered from 5 (11%). Beta-Lactamase activity was detected in 32 isolates recovered from 27 specimens (59%). These data illustrate the polymicrobial nature of external otitis in one-third of the patients and the role of anaerobic bacteria in one-quarter of them. Further prospective studies are warranted for evaluating the role of anaerobic bacteria in this infection and the therapeutic implications of these findings. C1 USN,MED CTR,DEPT PEDIAT,BETHESDA,MD 20814. USN,MED CTR,DEPT PATHOL,BETHESDA,MD 20814. USN,MED CTR,DEPT OTOLARYNGOL,BETHESDA,MD 20814. NR 20 TC 25 Z9 25 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD DEC PY 1992 VL 15 IS 6 BP 955 EP 958 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA JZ600 UT WOS:A1992JZ60000008 PM 1457667 ER PT J AU JENSEN, KL GANGULY, AK AF JENSEN, KL GANGULY, AK TI A COMPARISON OF THE TRANSMISSION COEFFICIENT AND THE WIGNER FUNCTION APPROACHES TO FIELD-EMISSION SO COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING LA English DT Article ID RESONANT TUNNELING STRUCTURES; QUANTUM-TRANSPORT; SIMULATION; DEVICES AB Standard treatments of the field emission problem typically rely on approximations to the evaluation of the Transmission Coefficient (TC). Recently, the Wigner Distribution Function (WDF) has been applied to this problem. In this paper, fast, accurate, and efficient numerical algorithms for each are presented and compared to each other and to traditional WKB and Fowler Nordheim approaches for silicon field emission. As each approach admits a trajectory interpretation, the methods for incorporating each into a larger Ensemble Particle Monte Carlo (EPMC) simulation of quantum transport are briefly discussed. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RI Jensen, Kevin/I-1269-2015 OI Jensen, Kevin/0000-0001-8644-1680 NR 26 TC 3 Z9 3 U1 0 U2 0 PU EMERALD GROUP PUBLISHING LTD PI BINGLEY PA HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND SN 0332-1649 J9 COMPEL JI Compel-Int. J. Comp. Math. Electr. Electron. Eng. PD DEC PY 1992 VL 11 IS 4 BP 457 EP 470 DI 10.1108/eb010106 PG 14 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic; Mathematics, Applied SC Computer Science; Engineering; Mathematics GA KL621 UT WOS:A1992KL62100008 ER PT J AU BUTLER, JT AF BUTLER, JT TI LOGGING OFF SO COMPUTER LA English DT Editorial Material RP BUTLER, JT (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD DEC PY 1992 VL 25 IS 12 BP 9 EP 9 PG 1 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA KB936 UT WOS:A1992KB93600002 ER PT J AU COOVERT, MD SALAS, E RAMAKRISHNA, K AF COOVERT, MD SALAS, E RAMAKRISHNA, K TI THE ROLE OF INDIVIDUAL AND SYSTEM CHARACTERISTICS IN COMPUTERIZED TRAINING SYSTEMS SO COMPUTERS IN HUMAN BEHAVIOR LA English DT Article ID GOODNESS; MODELS; TESTS; FIT AB Two studies examined the role of characteristics that are important to consider in the development of computerized training systems. The first study employed covariance structure modeling and tested a hypothesized model regarding the relationship among three latent variables and a set of measured variables serving as indicators for the latent variables. The overall model fit quite well according to both statistical and practical assessments. Results indicate that, for naive users, a latent variable reflecting an individual's attitude toward computers has a significant influence on the other two latent variables, one being how the computerized task is perceived, and the second being the choice of interacting with a computer in the future. A structural path representing the influence of the current experience with the computer has a small directional influence on future interaction preference with a person rather than a computer A second study examined system characteristics and focused specifically on preferences for how much power an expert system should be given. Scenarios were developed depicting three different types of expert systems, each with three different levels of power Results indicate that individuals prefer those systems with either low or moderate power, those which do not initiate action without human intervention. Systems that initiate action on their own are not viewed positively. The discussion focuses on implications for future training systems. C1 USN,CTR TRAINING SYST,WASHINGTON,DC 20350. OHIO STATE UNIV,COLUMBUS,OH 43210. RP COOVERT, MD (reprint author), UNIV S FLORIDA,TAMPA,FL 33620, USA. NR 51 TC 2 Z9 2 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0747-5632 J9 COMPUT HUM BEHAV JI Comput. Hum. Behav. PD WIN PY 1992 VL 8 IS 4 BP 335 EP 352 DI 10.1016/0747-5632(92)90028-D PG 18 WC Psychology, Multidisciplinary; Psychology, Experimental SC Psychology GA JK888 UT WOS:A1992JK88800004 ER PT J AU WEISS, PJ FRUM, DK KENNEDY, CA AF WEISS, PJ FRUM, DK KENNEDY, CA TI LARGE ERYTHEMATOUS PATCH AS THE PRESENTING MANIFESTATION OF MENINGOCOCCEMIA SO CUTIS LA English DT Article AB Meningococcemia commonly presents with a petechial rash and a transient macular or papular rash is sometimes present. This report describes a patient with meningococcemia who presented with an atypical erythematous patch over the right hemithorax, petechial rash, and a normal platelet count. The patient was treated with broad-spectrum antibiotics and his condition rapidly improved. He was discharged showing complete resolution of his rash with no neurologic sequelae. C1 USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134. USN HOSP,DEPT DERMATOL,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. NR 6 TC 0 Z9 0 U1 0 U2 0 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0011-4162 J9 CUTIS JI Cutis PD DEC PY 1992 VL 50 IS 6 BP 417 EP 418 PG 2 WC Dermatology SC Dermatology GA LB048 UT WOS:A1992LB04800007 PM 1486792 ER PT J AU WU, C KIANG, RL AF WU, C KIANG, RL TI FINITE-TIME THERMODYNAMIC ANALYSIS OF A CARNOT ENGINE WITH INTERNAL IRREVERSIBILITY SO ENERGY LA English DT Article ID EFFICIENCY; POWER AB This paper extends Curzon and Ahlborn's result which gives a thermodynamic efficiency of an endoreversible Carnot engine. It is shown that the internal irreversibilities of a Carnot engine can be characterized by a single parameter representing, the ratio of two entropy differences. Named the cycle irreversibility parameter, the presence of this parameter in the equations for maximum power and efficiency clearly shows that an engine with internal irreversibilities delivers less power and has a lower efficiency than an endoreversible engine. C1 USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS DETACHMENT,ANNAPOLIS,MD 21402. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 5 TC 110 Z9 122 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD DEC PY 1992 VL 17 IS 12 BP 1173 EP 1178 DI 10.1016/0360-5442(92)90006-L PG 6 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA JW238 UT WOS:A1992JW23800006 ER PT J AU BORIS, JP GRINSTEIN, FF ORAN, ES KOLBE, RL AF BORIS, JP GRINSTEIN, FF ORAN, ES KOLBE, RL TI NEW INSIGHTS INTO LARGE EDDY SIMULATION SO FLUID DYNAMICS RESEARCH LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON SUPERCOMPUTING AND EXPERIMENTS IN FLUID DYNAMICS CY SEP 03-05, 1991 CL NOBEYAMA, JAPAN AB Fluid dynamic turbulence is one of the most challenging computational physics problems because of the extremely wide range of time and space scales involved, the strong nonlinearity of the governing equations, and the many practical and important applications. While most linear fluid instabilities are well understood, the nonlinear interactions among them makes even the relatively simple limit of homogeneous isotropic turbulence difficult to treat physically, mathematically, and computationally. Turbulence is modeled computationally by a two-stage bootstrap process. The first stage, direct numerical simulation, attempts to resolve the relevant physical time and space scales but its application is limited to diffusive flows with a relatively small Reynolds number (Re). Using direct numerical simulation to provide a database, in turn, allows calibration of phenomenologic-al turbulence models for engineering applications. Large eddy simulation incorporates a form of turbulence modeling applicable when the large-scale flows of interest are intrinsically time dependent, thus throwing common statistical models into question. A promising approach to large eddy simulation involves the use of high-resolution monotone computational fluid dynamics algorithms such as flux-corrected transport or the piecewise parabolic method which have intrinsic subgrid turbulence models coupled naturally to the resolved scales in the computed flow. The physical considerations underlying and evidence supporting this monotone integrated large eddy simulation approach are discussed. RP BORIS, JP (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,CODE 6400,WASHINGTON,DC 20375, USA. NR 0 TC 396 Z9 406 U1 1 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-5983 J9 FLUID DYN RES JI Fluid Dyn. Res. PD DEC PY 1992 VL 10 IS 4-6 BP 199 EP 228 DI 10.1016/0169-5983(92)90023-P PG 30 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA KE062 UT WOS:A1992KE06200002 ER PT J AU ORAN, ES BORIS, JP DEVORE, CR AF ORAN, ES BORIS, JP DEVORE, CR TI REACTIVE-FLOW COMPUTATIONS ON A MASSIVELY PARALLEL COMPUTER SO FLUID DYNAMICS RESEARCH LA English DT Article; Proceedings Paper CT INTERNATIONAL WORKSHOP ON SUPERCOMPUTING AND EXPERIMENTS IN FLUID DYNAMICS CY SEP 03-05, 1991 CL NOBEYAMA, JAPAN AB Results are described of recent research and model developments for performing large-scale multidimensional compressible reacting-flow computations on the Connection Machine, a very fine-grained, parallel computer capable of multigigaflop performance. We are interested both in having general-purpose computer programs for routine production computations and in evaluating the architecture of the computer for a wide range of computational fluid dynamics and reacting-flow applications. We describe the hurdles involved in rethinking the structure and the algorithms to best suit this kind of computer, provide some relative timings for different programs, and describe ways of dealing with special constraints (such as periodic boundary conditions) imposed by the architecture. Finally, representative results are presented for several reacting and nonreacting computations, including the development and propagation of a spark in a hydrogen-oxygen mixture, an imploding detonation, and the generation of beam-channel turbulence. RP ORAN, ES (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,CODE 6400,WASHINGTON,DC 20375, USA. RI DeVore, C/A-6067-2015 OI DeVore, C/0000-0002-4668-591X NR 0 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-5983 J9 FLUID DYN RES JI Fluid Dyn. Res. PD DEC PY 1992 VL 10 IS 4-6 BP 251 EP 271 DI 10.1016/0169-5983(92)90025-R PG 21 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA KE062 UT WOS:A1992KE06200004 ER PT J AU ELLINGS, RJ OLSEN, EA AF ELLINGS, RJ OLSEN, EA TI A NEW PACIFIC PROFILE SO FOREIGN POLICY LA English DT Article C1 USN,POSTGRAD SCH,WASHINGTON,DC 20350. NR 0 TC 4 Z9 4 U1 0 U2 0 PU CARNEGIE ENDOWMENT INTL PEACE PI WASHINGTON PA 2400 N STREET NW, WASHINGTON, DC 20037 SN 0015-7228 J9 FOREIGN POLICY JI Foreign Policy PD WIN PY 1992 IS 89 BP 116 EP 136 DI 10.2307/1149077 PG 21 WC International Relations SC International Relations GA KB072 UT WOS:A1992KB07200008 ER PT J AU CORREDOR, EL AF CORREDOR, EL TI DISEMBODIMENTS OF THE FATHER IN MAGHREBIAN FICTION SO FRENCH REVIEW LA English DT Article C1 USN ACAD,ANNAPOLIS,MD 21402. NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN TEACH FRENCH PI CHAMPAIGN PA 57 EAST ARMORY AVE, CHAMPAIGN, IL 61820 SN 0016-111X J9 FR REV JI Fr. Rev. PD DEC PY 1992 VL 66 IS 2 BP 295 EP 304 PG 10 WC Literature, Romance SC Literature GA JW806 UT WOS:A1992JW80600010 ER PT J AU STROBEL, DF SUMMERS, ME ZHU, X AF STROBEL, DF SUMMERS, ME ZHU, X TI TITANS UPPER-ATMOSPHERE - STRUCTURE AND ULTRAVIOLET EMISSIONS SO ICARUS LA English DT Article ID EXTREME ULTRAVIOLET; ELECTRON-IMPACT; GRAVITY-WAVE; VOYAGER-1 ENCOUNTER; RADIO-OCCULTATION; MEDIUM-RESOLUTION; EDDY DIFFUSION; CROSS-SECTION; EUV EMISSION; MODEL C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. RP STROBEL, DF (reprint author), JOHNS HOPKINS UNIV,DEPT EARTH & PLANETARY SCI,BALTIMORE,MD 21218, USA. RI Zhu, Xun/C-2097-2016 OI Zhu, Xun/0000-0001-7860-6430 NR 37 TC 97 Z9 97 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 0019-1035 J9 ICARUS JI Icarus PD DEC PY 1992 VL 100 IS 2 BP 512 EP 526 DI 10.1016/0019-1035(92)90114-M PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KF814 UT WOS:A1992KF81400016 ER PT J AU CRISTOLOVEANU, S GULWADI, SM IOANNOU, DE CAMPISI, GJ HUGHES, HL AF CRISTOLOVEANU, S GULWADI, SM IOANNOU, DE CAMPISI, GJ HUGHES, HL TI HOT-ELECTRON-INDUCED DEGRADATION OF FRONT AND BACK CHANNELS IN PARTIALLY AND FULLY DEPLETED SIMOX MOSFETS SO IEEE ELECTRON DEVICE LETTERS LA English DT Article ID INSULATOR AB The characteristics of the front and back channels of 1-mum-long SIMOX MOSFET's are measured before and after various types and periods of hot-electron stress, and a comparison between the induced degradations is made. The back channel degrades much more severely than the front channel for both partially depleted and fully depleted devices. Fully depleted MOSFET's (140 nm thick) are favorably contrasted with partially depleted ones (300 nm thick) as to their vulnerability to hot-carrier-induced damage. Although defects are always located at and / or near the interface of the stressed channel, they may influence the properties of the opposite channel (via interface coupling) in fully depleted MOSFET's. C1 GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030. USN,RES LAB,WASHINGTON,DC 20375. ENSERG,INPG,PHYS COMPOSANTS SEMICOND LAB,F-38016 GRENOBLE,FRANCE. RP CRISTOLOVEANU, S (reprint author), ENSERG,PHYS COMPOSANTS SEMICOND LAB,CNRS,UA,F-38016 GRENOBLE,FRANCE. NR 9 TC 29 Z9 31 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD DEC PY 1992 VL 13 IS 12 BP 603 EP 605 DI 10.1109/55.192858 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JZ437 UT WOS:A1992JZ43700003 ER PT J AU DILLARD, RA AF DILLARD, RA TI USING DATA QUALITY MEASURES IN DECISION-MAKING ALGORITHMS SO IEEE EXPERT-INTELLIGENT SYSTEMS & THEIR APPLICATIONS LA English DT Article C1 USN,CTR OCEAN SYST,CTR OCEAN SYST,SAN DIEGO,CA 92152. RP DILLARD, RA (reprint author), NRAD,DECIS SUPPORT & AI SYST BRANCH,CODE 444,SAN DIEGO,CA 92152, USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0885-9000 J9 IEEE EXPERT JI IEEE Expert-Intell. Syst. Appl. PD DEC PY 1992 VL 7 IS 6 BP 63 EP 72 DI 10.1109/64.180410 PG 10 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KE051 UT WOS:A1992KE05100009 ER PT J AU KAHANER, DK AF KAHANER, DK TI TRANSPUTERS AND DATABASES SO IEEE MICRO LA English DT Article RP KAHANER, DK (reprint author), USN,OFF RES,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0272-1732 J9 IEEE MICRO JI IEEE Micro PD DEC PY 1992 VL 12 IS 6 BP 88 EP 89 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA KE114 UT WOS:A1992KE11400012 ER PT J AU JONES, GW SUNE, CT GRAY, HF AF JONES, GW SUNE, CT GRAY, HF TI SILICON FIELD-EMISSION TRANSISTORS AND DIODES SO IEEE TRANSACTIONS ON COMPONENTS HYBRIDS AND MANUFACTURING TECHNOLOGY LA English DT Article; Proceedings Paper CT 42ND ELECTRONIC COMPONENTS AND TECHNOLOGY CONF ( ECTC ) CY MAY 18-20, 1992 CL SAN DIEGO, CA AB Uniform, sharp point, and wedge type field emitter arrays (FEA's) have been fabricated by using orientation dependent etching (ODE) and reoxidation sharpening techniques. This fabrication process results in very sharp and reproducible silicon field emitters which have yielded electron emission currents exceeding 20 muA per tip for the point-like structures with under 90-V turn-on extraction voltages. Collected currents of 5 muA were obtained on wedge arrays at 300 V. Arrays of up to 30 000 pyramidal point type emitters have been fabricated. A process has also been developed for sealing these microtriodes in a vacuum. In this configuration, these devices may be handled like a transistor in air. These devices possess potential applicability to high temperature, transistors, and diodes with high kilowatt power at high frequencies (> 1 GHz), and for high brightness-high resolution displays. C1 USN,RES LAB,WASHINGTON,DC 20375. RP JONES, GW (reprint author), MCNC,CTR MICROELECTR,RES TRIANGLE PK,NC 27709, USA. NR 8 TC 7 Z9 7 U1 0 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0148-6411 J9 IEEE T COMPON HYBR PD DEC PY 1992 VL 15 IS 6 BP 1051 EP 1055 DI 10.1109/33.206930 PG 5 WC Engineering, Manufacturing; Engineering, Electrical & Electronic; Materials Science, Multidisciplinary SC Engineering; Materials Science GA KU432 UT WOS:A1992KU43200019 ER PT J AU SHWEHDI, MH HUGHES, CM QUASEM, MA AF SHWEHDI, MH HUGHES, CM QUASEM, MA TI BASE LOAD FUEL CONSUMPTION WITH RADIANT BOILER SIMULATION SO IEEE TRANSACTIONS ON ENERGY CONVERSION LA English DT Article; Proceedings Paper CT 1992 WINTER MEETING OF THE POWER ENGINEERING SOC OF IEEE CY JAN 26-30, 1992 CL NEW YORK, NY SP IEEE, POWER ENGN SOC AB The operating point of an oil fired radiant boiler, 580 Megawatt capacity, is critical in maximizing the availability, performance, reliability, and maintainability of a power producing system. operating the unit above the design operating point causes outages to occur sooner than scheduled. When the boiler is operated below the design operating point, fuel is wasted because the quantity of fuel required to operate a radiant boiler is the same, whether the design setpoint is maintained or not. This paper demonstrates by means of simulation software that the boiler design setpoint is critical to fuel consumption and optimum output megawatts. A boiler with this capacity is used to provide a portion of the base load of an electric utility in order to sustain revenues and maintain reliable generation. C1 NAVAL AIR STN,NAVAL AVIAT DEPOT,JACKSONVILLE,FL 32212. HOWARD UNIV,SCH BUSINESS,WASHINGTON,DC 20007. RP SHWEHDI, MH (reprint author), PENN STATE UNIV,LEHMAN,PA 18627, USA. NR 4 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 0885-8969 J9 IEEE T ENERGY CONVER JI IEEE Trans. Energy Convers. PD DEC PY 1992 VL 7 IS 4 BP 677 EP 683 DI 10.1109/60.182650 PG 7 WC Energy & Fuels; Engineering, Electrical & Electronic SC Energy & Fuels; Engineering GA JY076 UT WOS:A1992JY07600009 ER PT J AU PETERSEN, EL PICKEL, JC ADAMS, JH SMITH, EC AF PETERSEN, EL PICKEL, JC ADAMS, JH SMITH, EC TI RATE PREDICTION FOR SINGLE EVENT EFFECTS - A CRITIQUE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID RAY-INDUCED ERRORS; ON-ORBIT OBSERVATIONS; CMOS SRAMS; SEU CHARACTERIZATION; MEMORY CELLS; COSMIC-RAYS; UPSET RATE; RAMS; DEVICES; SENSITIVITY AB The prediction of single event rates depends upon the proper interpretation of ground test data and upon the way the data is used in the rate calculations. This work performs a critical review of various methods used for heavy ion predictions and recommends a standard approach. C1 MAXWELL LABS INC,DIV S-CUBED,SAN DIEGO,CA 92121. RP PETERSEN, EL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 63 TC 131 Z9 137 U1 1 U2 13 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 1992 VL 39 IS 6 BP 1577 EP 1599 DI 10.1109/23.211340 PN 1 PG 23 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500003 ER PT J AU PETERSEN, EL AF PETERSEN, EL TI THE RELATIONSHIP OF PROTON AND HEAVY-ION UPSET THRESHOLDS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID NUCLEAR-REACTIONS; STATIC RAMS; SEU; SILICON; ORBIT; MODEL AB This paper presents a method of obtaining proton upset thresholds from heavy ion upset thresholds, and vice versa. This approach allows upset rates in either environment to be estimated using data from either environment. Devices with LET thresholds above 10 MeV/mg/cm2 may have unnaceptable proton induced upset rates in the proton radiation belt. RP PETERSEN, EL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 39 Z9 41 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 1992 VL 39 IS 6 BP 1600 EP 1604 DI 10.1109/23.211341 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500004 ER PT J AU XAPSOS, MA AF XAPSOS, MA TI APPLICABILITY OF LET TO SINGLE EVENTS IN MICROELECTRONIC STRUCTURES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM AB LET is often used as a single parameter to determine the energy deposited in a microelectronic structure by a single event. The accuracy of this assumption is examined for ranges of ion energies and volumes of silicon appropriate for modem microelectronics. It is shown to be accurate only under very restricted conditions. Significant differences arise because (1) LET is related to energy lost by the ion, not energy deposited in the volume, and (2) LET is an average value and does not account for statistical variations in energy deposition. Criteria are suggested for determining when factors other than LET should be considered, and new analytical approaches are presented to account for them. One implication of these results is that improvements can be made in space upset rate predictions by incorporating the new methods into currently used codes such as CREME and CRUP. This necessitates implementing the calculations with a cosmic ray intensity spectrum that is a function of cosmic ray energy per unit mass rather than the currently used intensity vs. LET spectrum. Another implication is that an improved understanding of the information contained in measured heavy ion upset cross section curves can be gained through use of the new methods. This can be accomplished by, first of all, measuring and analyzing the curves as a function of energy deposited in the sensitive volume, not energy lost by the ion as is currently the practice. In some situations, improved values of SEU thresholds and critical charges will result. Selection of ions at test facilities can also be important when using different ions to test the same chip. A choice should be made such that the energy deposited by the two ions overlaps. This is not necessarily the same as choosing ions with overlapping effective LETs. Making the latter choice and plotting the experimental results as a function of effective LET can cause a discontinuity in the cross section curve at the point of the ion beam change. Finally, consideration of statistical fluctuations in energy deposition may lead to a better understanding of the origin of the width of the quickly rising portion of the cross section curve. All of the above considerations increase in significance for devices with smaller dimensions and for ions with higher incident energies. Therefore, they will continue to grow in importance for future generation devices. RP XAPSOS, MA (reprint author), USN,RES LAB,RADIAT EFFECTS BRANCH,WASHINGTON,DC 20375, USA. NR 18 TC 55 Z9 57 U1 1 U2 12 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 1992 VL 39 IS 6 BP 1613 EP 1621 DI 10.1109/23.211343 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500006 ER PT J AU BUCHNER, S KANG, K STAPOR, WJ RIVET, S AF BUCHNER, S KANG, K STAPOR, WJ RIVET, S TI SPATIAL AND TEMPORAL DEPENDENCE OF SEU IN A 64K SRAM SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID CIRCUITS AB A pulsed picosecond laser was used to measure the spatial and temporal dependence of single event upsets (SEUs) in a 64K SRAM (HM65642C) that was not hardened to SEU. Consistent and repeatable upset thresholds and latchup were measured when the light was focussed on the drains of the sensitive transistors. The SRAM's sensitivity to SEU was found to depend on the arrival time of the laser pulse relative to the time when the cell was addressed. Striking results were found when the light was focussed outside the sensitive drains. Whether an upset occurred depended on both the position of the laser spot and the information stored in the cell. Under certain conditions an ''upset window'' was observed. A single pulse of light incident on a particular cell produced upsets in surrounding cells depending on the data stored in those cells. C1 USN,RES LAB,WASHINGTON,DC 20375. HARRIS SEMICOND INC,MELBOURNE,FL 32902. RP BUCHNER, S (reprint author), MARTIN MARIETTA CORP LABS,1450 S ROLLING RD,BALTIMORE,MD 21227, USA. NR 7 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1630 EP 1635 DI 10.1109/23.211345 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500008 ER PT J AU MCMORROW, D MELINGER, JS KNUDSON, AR CAMPBELL, AB WEATHERFORD, T TRAN, LH CURTICE, WR AF MCMORROW, D MELINGER, JS KNUDSON, AR CAMPBELL, AB WEATHERFORD, T TRAN, LH CURTICE, WR TI PICOSECOND CHARGE-COLLECTION DYNAMICS IN GAAS-MESFETS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID TEMPERATURE MODEL; SILICON AB Ion- and picoseconnd-laser induced charge-collection measurements performed as a function of temperature and device bias conditions reveal the significant changes that occur in the charge collection transients as a function of these parameters. The temperature-dependent results provide new evidence that above-band-gap picosecond laser excitation can reproduce the primary features of the ion-induced charge-collection transients measured for GaAs MESFETs. Bias dependence results reveal clearly the sensitive role of the device operating point in determining both the shape and total integrated intensity of the measured charge-collection transients. Preliminary two dimensional computer simulation results are presented; these results suggest carrier-induced channel modulation as the primary mechanism for enhanced charge collection in GaAs MESFETs. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. WR CURTICE CONSULTING,PRINCETON JCT,NJ 08550. RP MCMORROW, D (reprint author), USN,RES LAB,CODE 4613,WASHINGTON,DC 20375, USA. NR 18 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 1992 VL 39 IS 6 BP 1657 EP 1664 DI 10.1109/23.211350 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500013 ER PT J AU LI, Z KRANER, HW VERBITSKAYA, E EREMIN, V IVANOV, A RATTAGGI, M RANCOITA, PG RUBINELLI, FA FONASH, SJ DALE, C MARSHALL, P AF LI, Z KRANER, HW VERBITSKAYA, E EREMIN, V IVANOV, A RATTAGGI, M RANCOITA, PG RUBINELLI, FA FONASH, SJ DALE, C MARSHALL, P TI INVESTIGATION OF THE OXYGEN-VACANCY (A-CENTER) DEFECT COMPLEX PROFILE IN NEUTRON-IRRADIATED HIGH-RESISTIVITY SILICON JUNCTION PARTICLE DETECTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID LEVEL TRANSIENT SPECTROSCOPY; N-TYPE SILICON; RADIATION-DAMAGE; ELECTRON AB The distribution of the A-center (oxygen-vacancy) in neutron damaged silicon detectors has been studied using Deep Level Transient Spectroscopy. A-centers have been found to be nearly uniformly distributed in the silicon wafer depth for medium resistivity (0.1 to 0.2 kOMEGA-cm) silicon detectors and high resistivity (> 4 kOMEGA-cm) high temperature (1200-degrees-C) oxidized detectors. A positive filling pulse was needed to detect the A-centers in high resistivity silicon detectors, and this effect was found to be dependent on the oxidation temperature. A discussion of this effect is presented. The A-center was not observed in a sample from a high temperature oxidation with TCA having a very high carbon content. C1 AF IOFFE PHYS TECH INST,ST PETERSBURG,RUSSIA. INFN,MILAN,ITALY. PENN STATE UNIV,CTR ELECTR MAT & PROC,UNIV PK,PA 16802. USN,RES LAB,WASHINGTON,DC 20375. RP LI, Z (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Verbitskaya, Elena/D-1521-2014; Ivanov, Alexander/E-3993-2014; Rancoita, Pier Giorgio/J-9896-2015 OI Rancoita, Pier Giorgio/0000-0002-1990-4283 NR 23 TC 50 Z9 50 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1730 EP 1738 DI 10.1109/23.211360 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500023 ER PT J AU CAMPBELL, A MCDONALD, P RAY, K AF CAMPBELL, A MCDONALD, P RAY, K TI SINGLE EVENT UPSET RATES IN SPACE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM AB SEUs in the CRRES MEP showed a dramatic increase during a solar flare, the influence of the flare varied widely among device types, and a GaAs RAM showed a different response to the proton belts than some Si RAMs. Corrections to the SEU rate to account for orbital dwell time emphasize the dramatic difference between the rate in the proton belts and the rate due to cosmic ray ions above the belts. In the case of one device, apparent total dose damage resulted in a large increase in upsets due to unreliable device operation. C1 SFA INC,LANDOVER,MD. PHILLIPS LAB,BEDFORD,MA. RP CAMPBELL, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 22 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 1992 VL 39 IS 6 BP 1828 EP 1835 DI 10.1109/23.211373 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500036 ER PT J AU PETERSEN, EL ADAMS, JH AF PETERSEN, EL ADAMS, JH TI COMPARISON OF SEU RATE PREDICTION TECHNIQUES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID ERRORS AB A variety of methods are in use for predicting upset rates. The predictions of several of these methods are compared with flight data from the microelectronics package on the CRRES satellite. The implications of current cosmic ray research relative to these results is discussed. C1 USN,RES LAB,GAMMA & COSM RAY ASTRON BRANCH,WASHINGTON,DC 20375. RP PETERSEN, EL (reprint author), USN,RES LAB,RADIAT EFFECTS BRANCH,WASHINGTON,DC 20375, USA. NR 18 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1836 EP 1839 DI 10.1109/23.211374 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500037 ER PT J AU RAY, KP MULLEN, EG STAPOR, WJ CIRCLE, RR MCDONALD, PT AF RAY, KP MULLEN, EG STAPOR, WJ CIRCLE, RR MCDONALD, PT TI CRRES DOSIMETRY RESULTS AND COMPARISONS USING THE SPACE RADIATION DOSIMETER AND P-CHANNEL MOS DOSIMETERS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM AB The total dose response from two types of dosimeters onboard the Combined Release and Radiation Effects Satellite (CRRES) are compared. Results from P-channel Metal Oxide Semiconductor (PMOS) dosimeters [1] were found to be in good agreement with those from the more conventional Space Radiation Dosimeter. The MOS type dosimeters offer cost and weight advantages over more sophisticated dosimeters designed to gather science quality data. Total dose results from the CRRES mission are presented for various shielding levels and conditions. C1 USN,RES LAB,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD 20875. RP RAY, KP (reprint author), PHILLIPS LAB,GPSP,BEDFORD,MA 01731, USA. NR 9 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1846 EP 1850 DI 10.1109/23.211376 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500039 ER PT J AU JACKSON, EM WEAVER, BD MAISCH, WG SUMMERS, GP AF JACKSON, EM WEAVER, BD MAISCH, WG SUMMERS, GP TI SURVIVABILITY OF HIGH-TC MICROWAVE DEVICES IN SPACE RADIATION ENVIRONMENTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID TEMPERATURE; YBA2CU3O7-DELTA; ELECTRON AB A low temperature radiation damage study of first-generation passive microwave devices fabricated from high temperature cuprate superconductors has been performed in order to examine the effects of nonionizing radiation damage. Changes in performance due to radiation-induced shifts in the transition temperature and to film erosion are discussed. The results show that if these relatively simple passive devices are reasonably well shielded, they should survive in typical five-year space applications. C1 UNIV MARYLAND,CATONSVILLE,MD 21228. RP JACKSON, EM (reprint author), USN,RES LAB,CODE 4615,WASHINGTON,DC 20375, USA. NR 13 TC 5 Z9 5 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 1992 VL 39 IS 6 BP 1865 EP 1868 DI 10.1109/23.211379 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500042 ER PT J AU STAPOR, WJ MEYERS, JP KINNISON, JD CARKHUFF, BG AF STAPOR, WJ MEYERS, JP KINNISON, JD CARKHUFF, BG TI LOW-DOSE RATE SPACE ESTIMATES FOR INTEGRATED-CIRCUITS USING REAL-TIME MEASUREMENTS AND LINEAR-SYSTEM THEORY SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID DEVICES AB Proton measurements of the low dose rate response for the ADSP2100 digital signal processor and a SEEQ EEPROM have indicated increased survivability. Real time measurements and linear system theory analysis combine to give reasonable estimates for the ''space like'' dose rate extrapolations. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. RP STAPOR, WJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1876 EP 1882 DI 10.1109/23.211381 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500044 ER PT J AU JENKINS, WC AF JENKINS, WC TI DOSE-RATE-INDEPENDENT TOTAL DOSE FAILURE IN 54F10 BIPOLAR LOGIC-CIRCUITS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM AB The Co-60 gamma ray total dose performance of unhardened bipolar 54F10 TTL integrated circuits was measured over dose rates from 0.0088 rad(SiO2)/s to 28 rads(SiO2)/s. Contrary to what others have reported on the 54F logic family, failure was independent of dose rate. RP JENKINS, WC (reprint author), USN,RES LAB,CODE 6816,WASHINGTON,DC 20375, USA. NR 7 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1899 EP 1902 DI 10.1109/23.211384 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500047 ER PT J AU JACUNSKI, MD PECKERAR, MC AF JACUNSKI, MD PECKERAR, MC TI A MODEL FOR RADIATION-INDUCED EDGE LEAKAGE IN BULK SILICON NMOS TRANSISTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID DEVICES AB A model for radiation induced edge leakage in bulk silicon NMOS transistors is presented. The model predictions agree well with data from devices fabricated with moat, LOCOS, and recessed field oxides. It is useful in selecting process parameters to optimize radiation hardness, analyzing the effects of device scaling, and evaluating new isolation techniques. C1 USN,RES LAB,WASHINGTON,DC 20375. RP JACUNSKI, MD (reprint author), WESTINGHOUSE ELECT CORP,DIV ADV TECHNOL,BALTIMORE,MD 21203, USA. NR 10 TC 13 Z9 14 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1947 EP 1952 DI 10.1109/23.211390 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500053 ER PT J AU MARSHALL, PW DALE, CJ BURKE, EA AF MARSHALL, PW DALE, CJ BURKE, EA TI SPACE RADIATION EFFECTS ON OPTOELECTRONIC MATERIALS AND COMPONENTS FOR A 1300 NM FIBER OPTIC DATA BUS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID INDUCED DISPLACEMENT DAMAGE; ENERGY-DEPENDENCE; PROTON; ELECTRON; SILICON; DIODES AB We report energy-dependent proton and Co-60 test results and analysis assessing performance of In0.53Ga0.47As Photodetectors and In0.71Ga0.29As0.61P0.39 laser diodes for satellite applications. Displacement damage degradation in the InGaAs photodetector is interpreted using DLTS. New calculations of the nonionizing energy loss (NIEL) for protons in InGaAs allow damage assessment using a general technique for evaluating displacement damage in orbit. For the first time, data are presented confirming the proton energy dependence of NIEL in a III-V material over the energy range of interest for spacecraft. We also discuss effects in optoelectronic devices due to total dose and ionization transients. C1 SPIRE CORP,BEDFORD,MA 01730. RP MARSHALL, PW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI shao, chongyun/M-6620-2013 NR 30 TC 25 Z9 25 U1 1 U2 6 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 1992 VL 39 IS 6 BP 1982 EP 1989 DI 10.1109/23.211394 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500057 ER PT J AU NOWLIN, RN ENLOW, EW SCHRIMPF, RD COMBS, WE AF NOWLIN, RN ENLOW, EW SCHRIMPF, RD COMBS, WE TI TRENDS IN THE TOTAL-DOSE RESPONSE OF MODERN BIPOLAR-TRANSISTORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID CIRCUITS AB The primary degradation in modern bipolar transistors that are subjected to ionizing radiation is a reduction in current gain. There are many factors that influence the total-dose response of bipolar transistors, including emitter bias, transistor polarity, emitter technology, emitter geometry, base design, and dose rate. The effects of each of these factors are investigated. Physical mechanisms consistent with the observed effects are described. C1 MISSION RES CORP,ALBUQUERQUE,NM 87106. USN,CTR SURFACE WARFARE,CRANE,IN 47522. RP NOWLIN, RN (reprint author), UNIV ARIZONA,1230 E SPEEDWAY,TUCSON,AZ 85721, USA. RI Schrimpf, Ronald/L-5549-2013 OI Schrimpf, Ronald/0000-0001-7419-2701 NR 18 TC 93 Z9 103 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 1992 VL 39 IS 6 BP 2026 EP 2035 DI 10.1109/23.211400 PN 1 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500063 ER PT J AU STAHLBUSH, RE CAMPISI, GJ MCKITTERICK, JB MASZARA, WP ROITMAN, P BROWN, GA AF STAHLBUSH, RE CAMPISI, GJ MCKITTERICK, JB MASZARA, WP ROITMAN, P BROWN, GA TI ELECTRON AND HOLE TRAPPING IN IRRADIATED SIMOX, ZMR AND BESOI BURIED OXIDES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID X-RAY; OXYGEN VACANCY; MOS DEVICES; SIO2; TRAPS; 77-DEGREES-K; INSULATOR; CO-60 AB Shallow electron and deep hole trapping in the buried oxides of SIMOX, ZMR and BESOI material are examined. By irradiating the oxides with x-rays at cryogenic temperatures, 40 - 50 K, hole motion is frozen and electrons are trapped. The oxide charge is determined by C-V measurements. Following the cryogenic irradiation, the electrons are detrapped by field stressing (tunneling) or by annealing (thermal excitation). Hole trapping is examined by annealing after the trapped electrons are removed by field stressing. Substantial shallow electron and deep hole trapping distributed uniformly through the oxide is observed for all buried oxides that are. processed above about 1100-degrees-C. A comparison to thermal oxides grown at 850-degrees-C and annealed at 1300-degrees-C with and without a polysilicon capping layer shows that the top silicon layer significantly increases trap formation. These results indicate that the oxide defects responsible for the electron and hole trapping are produced by chemically reducing the oxide and producing defects such as Si-Si pairs. The energy distribution of the electron trap depths is determined for SIMOX and BESOI annealed at 1300-degrees-C. These two materials have the same energy distributions. C1 ALLIED SIGNAL AEROSP, COLUMBIA, MD 21045 USA. NATL INST SCI & TECHNOL, GAITHERSBURG, MD 20899 USA. TEXAS INSTRUMENTS INC, DALLAS, TX 75265 USA. RP STAHLBUSH, RE (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 27 TC 63 Z9 63 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 2086 EP 2097 DI 10.1109/23.211407 PN 1 PG 12 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500070 ER PT J AU SAKS, NS RENDELL, RW AF SAKS, NS RENDELL, RW TI THE TIME-DEPENDENCE OF POSTIRRADIATION INTERFACE TRAP BUILDUP IN DEUTERIUM-ANNEALED OXIDES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID MOS DEVICES; SI-SIO2 INTERFACE; HYDROGEN; CAPACITORS; GENERATION; TRANSPORT; ELECTRONS; CENTERS; DEFECTS; STATES AB The time-dependent creation of interface traps N(it) in irradiated MOS devices has been studied in oxides which were annealed in either deuterium or hydrogen. We find that the rate of N(it) build-up is significantly retarded in the deuterium-annealed oxides. This result demonstrates conclusively that hydrogen must be involved in the N(it) creation process. RP SAKS, NS (reprint author), USN,RES LAB,CODE 6813,WASHINGTON,DC 20375, USA. NR 39 TC 37 Z9 37 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 1992 VL 39 IS 6 BP 2220 EP 2229 DI 10.1109/23.211424 PN 1 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500087 ER PT J AU BROWN, DB SAKS, NS AF BROWN, DB SAKS, NS TI INITIAL HYDROGEN-ION PROFILES DURING INTERFACE TRAP FORMATION IN MOS DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID RADIATION IMMUNITY; TIME-DEPENDENCE; HOT CARRIER; STATES; FIELD AB Detailed predictions based on the H+ transport model for interface trap creation require knowledge of the initial (post-irradiation) spatial distribution of H+ ions through the oxide. Proposed H+ distributions from the literature are evaluated by comparison of experimental data with calculations based on the model. We find that the experimental data are consistent with creation of radiation-induced H+ ions both within the bulk of the oxide and preferentially in the vicinity of the SiO2-Si interface (but not preferentially in the vicinity of the SiO2-gate interface). The balance between bulk and near-interface H+ generation appears dependent on the device fabrication process. RP BROWN, DB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 7 Z9 7 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 1992 VL 39 IS 6 BP 2236 EP 2243 DI 10.1109/23.211426 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500089 ER PT J AU WALTERS, RJ SHAW, GJ SUMMERS, GP BURKE, EA MESSENGER, SR AF WALTERS, RJ SHAW, GJ SUMMERS, GP BURKE, EA MESSENGER, SR TI RADIATION EFFECTS IN GA0.47IN0.53AS DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 29TH IEEE ANNUAL INTERNATIONAL NUCLEAR AND SPACE RADIATION EFFECTS CONF AND SHORT COURSE CY JUL 13-17, 1992 CL NEW ORLEANS, LA SP IEEE, RADIAT EFFECTS COMM ID INDUCED DISPLACEMENT DAMAGE; ENERGY-DEPENDENCE; SILICON; YBA2CU3O7-DELTA; IN0.53GA0.47AS; TEMPERATURE; ELECTRON AB The effects of irradiating Ga0.47In0.53As solar cells and p-i-n photodiodes with 1 MeV electrons have been measured using Deep Level Transient Spectroscopy (DLTS) and both dark and illuminated (1 sun, air mass zero (AM0)) current-voltage (I-V) measurements. The I-V measurements were made over the range 100K < T < 450K. Fits of the dark I-V data to the two term diode equation before irradiation were satisfactory, yielding an estimated band-gap energy of 0.79 eV. The recombination component of the dark current was found to increase linearly with fluence. The DLTS detected two radiation-induced defect levels, one shallow (E(c)-0.10 eV) and one near mid-gap (E(c)-0.29 eV). Temperature coefficients of the Ga0.47In0.53As photovoltaic parameters are presented which follow the same general behavior as other solar cell materials (e.g. Si and GaAs). However, a sharp decrease in the short circuit current is observed above almost-equal-to 375 K. This temperature is reduced by irradiation. The radiation-induced degradation of the open circuit voltage is shown to be accurately predicted from the dark I-V measurements. Isochronal thermal annealing induced recovery in the photovoltaic parameters at almost-equal-to 400 K, coinciding with an annealing stage of the near mid-gap defect level. The energy dependence of the nonionizing energy loss (NIEL), which has been shown to be useful in correlating displacement damage in other materials, is calculated here for Ga0.47In0.53As. C1 SPIRE CORP,BEDFORD,MA 01730. SFA INC,LANDOVER,MD 20785. RP WALTERS, RJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 16 Z9 17 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 2257 EP 2264 DI 10.1109/23.211429 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500092 ER PT J AU ROBSON, AE MORGAN, RL MEGER, RA AF ROBSON, AE MORGAN, RL MEGER, RA TI DEMONSTRATION OF A PLASMA MIRROR FOR MICROWAVES SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB A plane sheet of partially ionized plasma produced by a pulsed, hollow-cathode glow discharge in an axial magnetic field has been shown to reflect X-band microwaves as well as an equivalent sheet of metal. The plasma mirror can be established and extinguished on a time scale of about 20 mus and could form the basis of an extremely agile radar system. RP ROBSON, AE (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 3 TC 32 Z9 35 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1992 VL 20 IS 6 BP 1036 EP 1040 DI 10.1109/27.199569 PG 5 WC Physics, Fluids & Plasmas SC Physics GA KN760 UT WOS:A1992KN76000065 ER PT J AU ASCHER, HE LIN, TTY SIEWIOREK, DP AF ASCHER, HE LIN, TTY SIEWIOREK, DP TI MODIFICATION OF - ERROR LOG ANALYSIS - STATISTICAL MODELING AND HEURISTIC TREND ANALYSIS SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Article DE ERROR LOG; HARD FAILURE; INTERMITTENT FAULT; TRANSIENT FAULT; POWER-LAW NONHOMOGENEOUS POISSON PROCESS; WEIBULL DISTRIBUTION; DISPERSION-FRAME TECHNIQUE; FAILURE PREDICTION ID REPAIRABLE SYSTEMS; RELIABILITY AB The original paper used ''traditional statistical analysis'' to demonstrate the superiority of the proposed dispersion frame technique. The purpose was to distinguish between transient and intermittent errors and predict the occurrence of intermittent errors. This note shows that those traditional statistical methods were too ''traditional'' since they involved fitting a distribution to data which were not identically distributed. Appropriate statistical techniques for fitting models to such nonstationary data are briefly discussed, and reasons are proffered for the persistence of ''too traditional'' statistical methods in the reliability literature. C1 UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093. CARNEGIE MELLON UNIV,DEPT ELECT & COMP ENGN,PITTSBURGH,PA 15213. USN,RES LAB,WASHINGTON,DC 20375. OI Siewiorek, Daniel/0000-0001-6644-3929 NR 14 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 0018-9529 J9 IEEE T RELIAB JI IEEE Trans. Reliab. PD DEC PY 1992 VL 41 IS 4 BP 599 EP & DI 10.1109/24.249595 PG 0 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KJ438 UT WOS:A1992KJ43800026 ER PT J AU DUECK, GW BUTLER, JT AF DUECK, GW BUTLER, JT TI MINIMIZATION ALGORITHM FOR NONCONCURRENT PLAS SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article AB In the design of certain self-checking programmable logic arrays (PLAs), at most one line is activated in the AND plane, such PLAs are termed non-concurrent. A heuristic algorithm for the minimization of non-concurrent PLAs is presented. It operates on two adjacent cubes, replacing them by one, two, and sometimes more than two cubes. The algorithm produces the best solutions known so far. C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. RP DUECK, GW (reprint author), ST FRANCIS XAVIER UNIV,DEPT MATH & COMP SCI,ANTIGONISH B2G 1C0,NS,CANADA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7217 J9 INT J ELECTRON JI Int. J. Electron. PD DEC PY 1992 VL 73 IS 6 BP 1113 EP 1119 DI 10.1080/00207219208925781 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA KH979 UT WOS:A1992KH97900002 ER PT J AU CAMPBELL, JF ROHSENOW, WM AF CAMPBELL, JF ROHSENOW, WM TI GAS-TURBINE REGENERATORS - A METHOD FOR SELECTING THE OPTIMUM PLATE-FINNED SURFACE PAIR FOR MINIMUM CORE VOLUME SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article AB A power law approximation for the Kays-London heat exchanger data as modified by Soland is used to derive a closed form solution for sizing counterflow regenerators. This solution is used to develop criteria for obtaining the minimum volume heat exchanger. These criteria are: (1) select a surface with minimum plate spacing for use on the cold side; (2) list other available surfaces with plate spacings approximately equal to the cold side plate spacing; (3) select from this list the surface with the minimum hydraulic diameter for use on the hot side. C1 MIT,DEPT MECH ENGN,CAMBRIDGE,MA 02139. RP CAMPBELL, JF (reprint author), USN,COMMANDER SUBMARINE FORCE,US ATLANTIC FLEET,NORFOLK,VA 23511, USA. NR 5 TC 4 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD DEC PY 1992 VL 35 IS 12 BP 3441 EP 3450 DI 10.1016/0017-9310(92)90230-P PG 10 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA KD421 UT WOS:A1992KD42100021 ER PT J AU PIRIE, RB AF PIRIE, RB TI BEYOND THE THAW - A NEW NATIONAL STRATEGY - DEITCHMAN,SJ SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Book Review RP PIRIE, RB (reprint author), USN,COLL WAR,NAVAL OPERAT STRATEG STUDIES GRP,NEWPORT,RI 02840, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0748-5492 J9 ISSUES SCI TECHNOL JI Issues Sci. Technol. PD WIN PY 1992 VL 8 IS 2 BP 91 EP 93 PG 3 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA GZ168 UT WOS:A1992GZ16800045 ER PT J AU YU, ZQ COLLINS, G HARBISON, B AGGAWAL, I REICHER, D MCNEIL, J AF YU, ZQ COLLINS, G HARBISON, B AGGAWAL, I REICHER, D MCNEIL, J TI HERMETIC COATINGS ON FLUORIDE GLASS-FIBERS USING CYLINDRICAL MAGNETRON REACTIVE SPUTTERING SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS LA English DT Article DE HERMETIC COATING; HEAVY METAL FLUORIDE FIBERS; CYLINDRICAL MAGNETRON; REACTIVE SPUTTERING; HOLLOW CATHODE AB The hollow cathode cylindrical magnetron is demonstrated to be capable of depositing uniform coatings on heavy metal fluoride fibers while maintaining the fiber temperature below 150-degrees-C. Pure metal coatings were deposited at typically 3000 angstrom/min, while oxynitride coatings were deposited at roughly 300 angstrom/min. We also demonstrated the hermeticity of AlN coatings for periods of several hundred hours even when immersed in water. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV NEW MEXICO,DEPT ELECT ENGN,ALBUQUERQUE,NM 87131. RP YU, ZQ (reprint author), COLORADO STATE UNIV,DEPT ELECT ENGN,FT COLLINS,CO 80523, USA. OI Reicher, David/0000-0002-3512-1975 NR 9 TC 5 Z9 5 U1 0 U2 0 PU JAPAN J APPLIED PHYSICS PI MINATO-KU TOKYO PA DAINI TOYOKAIJI BLDG 24-8 SHINBASHI 4-CHOME, MINATO-KU TOKYO 105, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Short Notes Rev. Pap. PD DEC PY 1992 VL 31 IS 12A BP 3969 EP 3971 DI 10.1143/JJAP.31.3969 PG 3 WC Physics, Applied SC Physics GA KJ151 UT WOS:A1992KJ15100039 ER PT J AU YU, ZQ LI, LM SHI, BX COLLINS, G MEYER, J HARBISON, B AGGARWAL, I AF YU, ZQ LI, LM SHI, BX COLLINS, G MEYER, J HARBISON, B AGGARWAL, I TI MAGNETIC-FIELD SWITCHING OF CYLINDRICAL MAGNETRON SPUTTERING RATES FOR COATING GLASS-FIBERS AND RODS SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS LA English DT Article DE CYLINDRICAL MAGNETRON; SPUTTERING DEPOSITION; MAGNETIC FIELD; COAXIAL ANODE GRIDS AB Abrupt switching of the sputtering rate in a cylindrical magnetron via changes in the longitudinal magnetic field has been investigated. The hollow cylindrical magnetron, equipped with an internal array of cylindrical-shaped coaxial anode grids, was employed to achieve a controllable modulation of the sputtering deposition rate via external variation of the longitudinal magnetic field though a critical field value. The rapid change of sputtering rate versus magnetic field allows for abrupt control of the sputter deposition rate of films on cylindrical rod or fiber substrate placed within the coaxial geometry. C1 QUANTUM RES CORP,FT COLLINS,CO 80525. USN,RES LAB,WASHINGTON,DC 20375. RP YU, ZQ (reprint author), COLORADO STATE UNIV,FT COLLINS,CO 80523, USA. NR 5 TC 0 Z9 0 U1 1 U2 1 PU JAPAN J APPLIED PHYSICS PI MINATO-KU TOKYO PA DAINI TOYOKAIJI BLDG 24-8 SHINBASHI 4-CHOME, MINATO-KU TOKYO 105, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Short Notes Rev. Pap. PD DEC PY 1992 VL 31 IS 12A BP 4048 EP 4050 DI 10.1143/JJAP.31.4048 PG 3 WC Physics, Applied SC Physics GA KJ151 UT WOS:A1992KJ15100054 ER PT J AU JAGANATHAN, J EWING, KJ AGGARWAL, I AF JAGANATHAN, J EWING, KJ AGGARWAL, I TI DETERMINATION OF IRON, COBALT, NICKEL AND COPPER IN A ZIRCONIUM-BASED GLASS BY ELECTROTHERMAL ATOMIC-ABSORPTION SPECTROMETRY SO JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY LA English DT Article DE ZIRCONIUM-BASED FLUORIDE GLASS; ZIRCONIUM OXYCHLORIDE; ELECTROTHERMAL ATOMIC ABSORPTION SPECTROMETRY; CHEMICAL MODIFIER; METHODOLOGICAL DETECTION LIMIT ID FLUORIDE GLASSES; FIBERS; CRYSTALLIZATION; METAL AB By dissolving a zirconium-based fluoride glass in a solution of zirconium oxychloride, ZrOCl2.8H2O, the direct determination of Fe, Co, Ni and Cu was achieved by electrothermal atomic absorption spectrometry. The accuracy of results obtained from solution analysis was confirmed using a preconcentration method carried out independently. The average precision of measurements (relative standard deviation) for all the elements was <10% and the methodological detection limits for Fe, Co, Ni and Cu, based on the preconcentration technique, were 0.05, 0.04, 0.1 and 0.04 ng g-1, respectively. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. RP JAGANATHAN, J (reprint author), GEOCENTERS INC,FT WASHINGTON,MD 20744, USA. NR 11 TC 3 Z9 4 U1 0 U2 0 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0267-9477 J9 J ANAL ATOM SPECTROM JI J. Anal. At. Spectrom. PD DEC PY 1992 VL 7 IS 8 BP 1287 EP 1290 DI 10.1039/ja9920701287 PG 4 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA KX715 UT WOS:A1992KX71500022 ER PT J AU SPRANGLE, P TING, A ESAREY, E FISHER, A AF SPRANGLE, P TING, A ESAREY, E FISHER, A TI TUNABLE, SHORT PULSE HARD X-RAYS FROM A COMPACT LASER SYNCHROTRON SOURCE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FREE-ELECTRON LASER; AMPLIFICATION; GENERATION; SCATTERING; RADIATION; BETATRON; POWER; BEAMS; GAIN AB A compact laser synchrotron source (LSS) is proposed as a means of generating tunable, narrow bandwidth, ultra-short pulses of hard x rays. The LSS is based on the Thomson backscattering of intense laser radiation from a counterstreaming electron beam. Advances in both compact ultra-intense solid-state lasers and high brightness electron accelerators make the LSS an attractive compact source of high brightness pulsed x rays, particularly at photon energies beyond approximately 30 keV. The x-ray wavelength is lambda[angstrom] = 650 lambda0[mum]/E(b)2[MeV], where lambda0 is the laser wavelength and E(b) is the electron beam energy. For E(b) = 72 MeV and lambda0 = 1 mum, x rays at lambda = 0.12 angstrom (100 keV) are generated. The spectral flux, brightness, bandwidth, and pulse structure are analyzed. In the absence of filtering, the spectral bandwidth in the LSS is typically less than or similar to 1% and is limited by electron beam emittance and energy spread. Two configuration of the LSS are discussed, one providing high peak power and the other moderate average power x rays. Using present day technology, the LSS can generate picosecond pulses of x rays consisting of > 10(9) photons/pulse with a peak brightness of greater than or similar to 10(20) photons/s mm2 mrad2 (0.1% BW) and photon energies ranging from 50 to 1200 keV. RP SPRANGLE, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 37 TC 138 Z9 146 U1 0 U2 14 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 1992 VL 72 IS 11 BP 5032 EP 5038 DI 10.1063/1.352031 PG 7 WC Physics, Applied SC Physics GA KA932 UT WOS:A1992KA93200002 ER PT J AU GRUBER, JB HILLS, ME SELTZER, MD STEVENS, SB MORRISON, CA AF GRUBER, JB HILLS, ME SELTZER, MD STEVENS, SB MORRISON, CA TI ANALYSIS OF THE OPTICAL-SPECTRA OF TRIVALENT HOLMIUM IN YTTRIUM SCANDIUM GALLIUM GARNET SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CRYSTAL-FIELD PARAMETERS; ENERGY-LEVELS; ROOM-TEMPERATURE; LANTHANIDE IONS; GROWTH; THULIUM; LASER; ND-3+ AB The absorption spectrum of Ho3+ ions in yttrium scandium gallium garnet (Ho3+:YSGG) is reported at 4 K between 1.93 and 0.28 mum. Laser excitation spectra and laser-excited fluorescence spectra from Ho3+(4f10)2S+1L(J) multiplet manifolds F-5(4), S-5(2), and F-5(3) to the ground-state manifold I-5(8) were obtained at 4, 8, and 70 K. Unresolved emission is observed from Ho3+ ions in slightly disturbed cation (Y3+) Sites along with emission coming from Ho3+ ions occupying the regular cation (Y3+) sites having D2 symmetry. Temperature-dependent transitions (hot bands) observed in absorption at 8 and 70 K establish experimental crystal-field split (Stark) levels in 24 excited manifolds and the seven lowest energy Stark levels in I-5(8) (Z1 = 0, Z2 = 6, Z3 = 17, Z4 = 29, Z5 = 87, Z6 = 95, and Z7 = 102, all in cm-1). An algorithm is used to establish D2 symmetry labels GAMMA1, GAMMA2, GAMMA3, or GAMMA4 of individual experimental Stark levels. These levels are compared with results obtained from a calculation in which a parameterized Hamiltonian was diagonalized within the 50 lowest multiplet manifolds of Ho3+ (4f10). Comparisons between 157 experimental Stark levels and the corresponding predicted levels out of a total of 486 calculated levels yields a root-mean-square deviation of 5 cm-1. C1 USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,GREAT LAKES,IL 60088. UNIV ILLINOIS,URBANA,IL 61801. USA,ADELPHI LAB COMMAND,HARRY DIAMOND LABS,ADELPHI,MD 20783. RP GRUBER, JB (reprint author), SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192, USA. NR 27 TC 10 Z9 10 U1 1 U2 4 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 1992 VL 72 IS 11 BP 5253 EP 5264 DI 10.1063/1.352008 PG 12 WC Physics, Applied SC Physics GA KA932 UT WOS:A1992KA93200032 ER PT J AU MAGNO, R SPENCER, MG AF MAGNO, R SPENCER, MG TI ELECTRON-TUNNELING SPECTROSCOPY AND DEFECTS IN GAAS/ALGAAS/GAAS HETEROSTRUCTURES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ALXGA1-XAS AB Electron tunneling spectroscopy has been used to study the phonon modes of the GaAs electrode and the AlGaAs barrier of single barrier GaAs/AlGaAs/GaAs heterostructures. The barriers were spiked doped with Si or Be to determine whether defects or impurities in the barrier have an effect on the measured line shapes. The phonon line shapes and intensities have been observed to change after shining light on the devices to photoionize defects in the barrier. The results demonstrate that the charge state of defects in a heterostructure barrier can affect the interaction between a tunneling electron and the phonon modes of a tunnel barrier. C1 HOWARD UNIV,DEPT ELECT ENGN,WASHINGTON,DC 20059. RP MAGNO, R (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 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 DEC 1 PY 1992 VL 72 IS 11 BP 5333 EP 5336 DI 10.1063/1.351968 PG 4 WC Physics, Applied SC Physics GA KA932 UT WOS:A1992KA93200044 ER PT J AU FOSS, FM IHDE, DC BRENEMAN, DL PHELPS, RM FISCHMANN, AB SCHECHTER, GP LINNOILA, I BRENEMAN, JC COTELINGAM, JD GHOSH, BC STEINBERG, SM LYNCH, JW PHARES, JC STOCKER, JL BASTIAN, A SAUSVILLE, EA AF FOSS, FM IHDE, DC BRENEMAN, DL PHELPS, RM FISCHMANN, AB SCHECHTER, GP LINNOILA, I BRENEMAN, JC COTELINGAM, JD GHOSH, BC STEINBERG, SM LYNCH, JW PHARES, JC STOCKER, JL BASTIAN, A SAUSVILLE, EA TI PHASE-II STUDY OF PENTOSTATIN AND INTERMITTENT HIGH-DOSE RECOMBINANT INTERFERON ALFA-2A IN ADVANCED MYCOSIS-FUNGOIDES SEZARY-SYNDROME SO JOURNAL OF CLINICAL ONCOLOGY LA English DT Article ID T-CELL LYMPHOMA; CHRONIC LYMPHOCYTIC-LEUKEMIA; ELECTRON-BEAM RADIATION; LEUKOCYTE-A-INTERFERON; THERAPY; 2'-DEOXYCOFORMYCIN; TRIAL; PHOTOCHEMOTHERAPY; DEOXYCOFORMYCIN; DISSEMINATION C1 USN HOSP,NCI,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. VET AFFAIRS MED CTR,WASHINGTON,DC. GEORGE WASHINGTON UNIV,WASHINGTON,DC 20052. UNIV CINCINNATI,MED CTR,CINCINNATI,OH 45267. NR 45 TC 63 Z9 63 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0732-183X J9 J CLIN ONCOL JI J. Clin. Oncol. PD DEC PY 1992 VL 10 IS 12 BP 1907 EP 1913 PG 7 WC Oncology SC Oncology GA KA722 UT WOS:A1992KA72200012 PM 1453206 ER PT J AU RASLEAR, TG SHURTLEFF, D SIMMONS, L AF RASLEAR, TG SHURTLEFF, D SIMMONS, L TI LOUDNESS BISECTION AND MASKING IN THE RAT (RATTUS-NORVEGICUS) SO JOURNAL OF COMPARATIVE PSYCHOLOGY LA English DT Article ID BIAS AB The bisection method of animal psychophysical scaling was examined as a measurement procedure. The critical assumptions of bisection scaling, as described by Pfanzagl (1968), were tested to determine if a valid equal-interval scale could be derived. A valid scale was derived in which loudness for the rat (Rattus norvegicus; n = 13) was a power function of sound pressure for 4-kHz tones. Masking noise reduced the discriminability of tonal stimuli but did not affect the bisection point. This result is consistent with an interval scale representation of loudness and demonstrates scale meaningfulness. Loudness bisection data that have been reported in the literature for 3 species (humans, rats, and pigeons) are in substantial agreement with our results. C1 WALTER REED ARMY INST RES,DEPT MED NEUROSCI,WASHINGTON,DC 20307. USN,RES INST,THERMAL STRESS ADAPT PROGRAM,BETHESDA,MD 20814. RP RASLEAR, TG (reprint author), WALTER REED ARMY INST RES,DEPT MICROWAVE RES,WASHINGTON,DC 20307, USA. NR 23 TC 3 Z9 3 U1 0 U2 1 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0735-7036 J9 J COMP PSYCHOL JI J. Comp. Psychol. PD DEC PY 1992 VL 106 IS 4 BP 374 EP 382 DI 10.1037/0735-7036.106.4.374 PG 9 WC Behavioral Sciences; Psychology; Psychology, Multidisciplinary; Zoology SC Behavioral Sciences; Psychology; Zoology GA JY565 UT WOS:A1992JY56500007 PM 1451420 ER PT J AU HEALEY, AJ AF HEALEY, AJ TI MODEL-BASED MANEUVERING CONTROLS FOR AUTONOMOUS UNDERWATER VEHICLES SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article AB This paper proposes the development of a model following autopilot system for an Autonomous Underwater Vehicle (A UV) depth changing control. The parameters to command a maneuver are generated off-line and selected as appropriate by the vehicle's autonomous control system. A series of such preprogrammed maneuvers can be stored in an on-board computer, and used as command generation systems for the autopilot. The paper presents a linear model following control (LMFC) design based on the open-loop linearized vehicle model as the reference model, a robustness analysis of the scheme and simulation results of response in the dive-plane using the full nonlinear vehicle system equations. LMFC has been proposed for aircraft where certain desirable handling characteristics based on an arbitrary model are required or where decoupled control for Control Configured Vehicle (CCV) performance is needed. It is shown here that this model-based LMFC autopilot for underwater vehicles exhibits relatively robust behavior under conditions of parameter uncertainty and non-linearity which is not worse than the equivalent LQR/LTR for linear output feedback systems. Also, a tailored transient response is provided, conducive to near time optimal response. RP HEALEY, AJ (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 31 TC 8 Z9 8 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD DEC PY 1992 VL 114 IS 4 BP 614 EP 622 DI 10.1115/1.2897733 PG 9 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA KF823 UT WOS:A1992KF82300014 ER PT J AU WINCHELL, CS TURMAN, JW AF WINCHELL, CS TURMAN, JW TI A NEW TRAPPING TECHNIQUE FOR BURROWING OWLS - THE NOOSE ROD SO JOURNAL OF FIELD ORNITHOLOGY LA English DT Article AB A technique to trap ground dwelling owls, using monofilament nooses and wooden dowel rods, was developed. Setting noose rods does not require modification or disturbance to the burrow and the trap can easily be customized to fit different physical configurations of a burrow or mound. Using this technique permitted capture of 100% of Burrowing Owls (Athene cunicularia) during the fledgling season, a time when owls were extremely wary of any change near their burrows or roosts. Other capture techniques either required modification to the burrow entrance, had a lower capture rate, or caused adults to abandon the burrow temporally. C1 USDA,ANIM DAMAGE CONTROL,EL CAJON,CA 92021. RP WINCHELL, CS (reprint author), USN,NAT RESOURCES OFF,NAVAL AIR STN N ISL,BLDG 3,SAN DIEGO,CA 92135, USA. NR 7 TC 4 Z9 4 U1 0 U2 2 PU ASSOC FIELD ORNITHOLOGISTS PI BELOIT PA BELOIT COLLEGE, DEPT BIOLOGY, 700 COLLEGE ST, BELOIT, WI 53511 SN 0273-8570 J9 J FIELD ORNITHOL JI J. Field Ornithol. PD WIN PY 1992 VL 63 IS 1 BP 66 EP 70 PG 5 WC Ornithology SC Zoology GA HE684 UT WOS:A1992HE68400010 ER PT J AU HINSHAW, JC EDWARDS, WW GEORGE, C GILARDI, R AF HINSHAW, JC EDWARDS, WW GEORGE, C GILARDI, R TI SYNTHESIS OF 2,3,4,5-TETRANITROPYRROLE SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article ID POLYNITRO COMPOUNDS; OXIDATION AB Dealkylation of 1-tert-butyl-2,3,4-trinitropyrrole in boiling trifluroacetic acid gave 2,3,4-trinitropyrrole, the structure of which was confirmed by X-ray crystallography. Treatment of this trinitropyrrole with nitric acid/oleum briefly at 60-degrees gave 2,3,4,5-tetranitropyrrole. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP HINSHAW, JC (reprint author), THIOKOL CORP,RES & DEV LABS,BRIGHAM CITY,UT 84302, USA. NR 10 TC 13 Z9 13 U1 1 U2 5 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD DEC PY 1992 VL 29 IS 7 BP 1721 EP 1724 PG 4 WC Chemistry, Organic SC Chemistry GA KH409 UT WOS:A1992KH40900008 ER PT J AU WILLER, RL DAY, RS GILARDI, R GEORGE, C AF WILLER, RL DAY, RS GILARDI, R GEORGE, C TI SYNTHESIS AND PROPERTIES OF METHYLENE-BIS-(NITRAMINOFURAZANS) SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article ID CHEMISTRY AB Methylene-bis-(3-aminofurazans) and methylene-bis-3-(nitraminofurazans) with methyl and nitro substituents at the 4- and 4'-positions have been synthesized. The thermal properties and crystal structures of the compounds have been determined. As expected, the methyl-substituted nitramino compound bas better thermal stability than the nitro-substituted compound. The densities predicted for the compounds by the Holden method and those determined by X-ray crystallography are in close agreement. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP WILLER, RL (reprint author), THIOKOL CORP,TACT OPERAT,ELKTON DIV,ELKTON,MD 21922, USA. NR 14 TC 20 Z9 21 U1 0 U2 0 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD DEC PY 1992 VL 29 IS 7 BP 1835 EP 1839 PG 5 WC Chemistry, Organic SC Chemistry GA KH409 UT WOS:A1992KH40900026 ER PT J AU ABE, R FOOPHILLIPS, M GRANGER, LG KANAGAWA, O AF ABE, R FOOPHILLIPS, M GRANGER, LG KANAGAWA, O TI CHARACTERIZATION OF THE MLS(F) SYSTEM .1. A NOVEL POLYMORPHISM OF ENDOGENOUS SUPERANTIGENS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID T-CELL RECEPTOR; MAMMARY-TUMOR VIRUS; MAJOR HISTOCOMPATIBILITY COMPLEX; MHC GENE-PRODUCTS; CLONAL DELETION; I-E; MONOCLONAL-ANTIBODIES; SELF-ANTIGENS; TOLERANCE; EXPRESSION AB In addition to Mls(a) (Mls-1a) and Mls(c) (Mls-2a, Mls-3a), we and others have recently described a third set of stimulatory minor lymphocyte stimulating (Mls) determinants, which are ligands for "I-E related" Vbeta, Vbeta5, Vbeta11, and Vbeta12. Although all Vbeta associated with the recognition of the conventional Mls determinants are, in general, uniformly deleted in those animals expressing relevant Mls, expression of Mls(f)-related Vbeta reveals various deletion patterns among different strains. Here we describe extensive genetic studies to evaluate the relationship among the self-Ag responsible for clonal deletion of T cells bearing Mls(f)-related Vbeta by using antibodies specific for TCR Vbeta chain. In addition, a panel of T cell clones specific for the Mls(f) determinant were generated and employed to analyze the determinant specificity, which is recognized by Mls(f)-reactive T cells in vitro as well as the role of class II molecules in T cell recognition of the Mls(f) determinants. The results of these two independent approaches provide evidence that the Mls(f) system is composed of a set of gene products that reveal a unique polymorphism in the induction of clonal deletion in vivo and in T cell activation in vitro. One of these gene products causes almost complete deletion of the self-Mls(f) reactive T cell repertoire in vivo and elicits a strong proliferative response to Mls(f)-specific T cell clones. Expression of the other gene products results in the clonal deletion of only part of the Mls(f)-reactive T cell repertoire. Furthermore, the response pattern of Mls(f)-specific clones to intra-MHC recombinant inbred strains and the inhibition pattern of these clones by anti-class II antibody suggested that although expression of the I-E molecule is essential for T cell recognition of Mls(f) determinants, the Abeta gene may also contribute to the efficient presentation of Mls(f) determinants by forming unique class II EalphaAbeta molecules. C1 WASHINGTON UNIV,SCH MED,DEPT PATHOL,ST LOUIS,MO 63110. NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. RP ABE, R (reprint author), USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,MAIL STOP 44,BETHESDA,MD 20889, USA. FU NIAID NIH HHS [AI30803] NR 42 TC 18 Z9 18 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 1992 VL 149 IS 11 BP 3429 EP 3439 PG 11 WC Immunology SC Immunology GA JY875 UT WOS:A1992JY87500001 PM 1331235 ER PT J AU FOOPHILLIPS, M KOZAK, CA PRINCIPATO, MAC ABE, R AF FOOPHILLIPS, M KOZAK, CA PRINCIPATO, MAC ABE, R TI CHARACTERIZATION OF THE MLS(F) SYSTEM .2. IDENTIFICATION OF MOUSE MAMMARY-TUMOR VIRUS PROVIRUSES INVOLVED IN THE CLONAL DELETION OF SELF-MLS(F)-REACTIVE T-CELLS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID SUPERANTIGEN; ANTIGENS; GENES; EXPRESSION; V-BETA-11; TOLERANCE; PRODUCTS; MICE AB The genetic linkage of loci encoding stimulatory Mls(s) and Mls(c) determinants with proviruses of mouse mammary tumour viruses (MMTV) has been shown. We previously have reported that the ligand(s) for Vbeta5, Vbeta11, and Vbeta12 behaves as a novel minor lymphocyte-stimulating (Mls) determinant(s), Mls(f), to induce the strong proliferation of unprimed T cells, and that this ligand(s) also functions as a self-Ag for the clonal deletion of self-reactive T cells. In the accompanying paper (Part I), a unique polymorphism characteristic of the Mls(f) gene product is presented. In order to determine the genetic basis for this novel Mls system, we examined the progeny of multiple genetic crosses to identify the MMTV proviral loci involved in the clonal deletion of self-Mls(f)-reactive T cells. Results from these investigations indicated that at least three known MMTV proviruses, Mtv-8, Mtv-9, and Mtv-11 are involved in the expression of Mls(f) gene products. Presence of Mtv-9 results in the complete deletion of Vbeta5, Vbeta11, and Vbeta12; Mtv-8 is associated with the complete deletion of Vbeta12, but only a partial deletion of Vbeta11 (primarily CD4-positive T cell subset) with little or no deletion of Vbeta5; and Mtv-11 induces the complete deletion of Vbeta11 and Vbeta12, but no deletion of Vbeta5. Given the significant sequence homology in the C-terminal portion of the open reading frame (ORF) region among these three MMTV and the almost equivalent effect of these three MMTV provirus upon the Vbeta12 repertoire, their apparent hierarchic effect upon the Vbeta5 and Vbeta11 repertoires suggests that affinity differences in recognition of the same determinant by different TCR Vbeta may play a significant role in the clonal deletion of self-reactive T cells. C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,MAIL STOP 44,BETHESDA,MD 20889. NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. US FDA,DIV MICROBIOL,VIRULENCE ASSESSMENT BRANCH,LAUREL,MD 20708. NIAID,MOLEC MICROBIOL LAB,BETHESDA,MD 20892. NR 27 TC 15 Z9 15 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 1992 VL 149 IS 11 BP 3440 EP 3447 PG 8 WC Immunology SC Immunology GA JY875 UT WOS:A1992JY87500002 PM 1331236 ER PT J AU KIMURATAKEUCHI, M MAJDE, JA TOTH, LA KRUEGER, JM AF KIMURATAKEUCHI, M MAJDE, JA TOTH, LA KRUEGER, JM TI THE ROLE OF DOUBLE-STRANDED-RNA IN INDUCTION OF THE ACUTE-PHASE RESPONSE IN AN ABORTIVE INFLUENZA-VIRUS INFECTION MODEL SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID TUMOR NECROSIS FACTOR; INTERFERON-BETA; FACTOR-ALPHA; INTERLEUKIN-1; RABBITS; LIPOPOLYSACCHARIDES; PROSTAGLANDIN-E2; MONOCYTES; ENDOTOXIN; CYTOKINES AB The inducer of the acute-phase response in "flu-like" viral infections is not defined. The hypothesis that virus-associated double-stranded (ds) RNA serves this function was investigated by comparison of several acute-phase responses (fever and sleep patterns, white and nucleated red blood cell levels, serum antiviral activity and ceruloplasmin) induced by the synthetic dsRNA polyriboinosinic:polyribocytidylic acid (poly[rI:rC]) with those induced by influenza virus in rabbits. The capacity of either dsRNA or influenza virus to induce hyporesponsiveness with respect to these acute-phase parameters upon rechallenge with the same agent or cross-challenge 24 h later was also examined. Poly(rI:rC) induced only minimal hyporesponsiveness to itself but was a potent inducer of hyporesponsiveness to virus with respect to fever, sleep, leukograms, and antiviral activity. Therefore, poly(rI:rC) can substitute for virus in terms of induction of acute-phase hyporesponsiveness, suggesting that dsRNA of viral origin triggers the acute-phase response in this model of influenza. C1 UNIV TENNESSEE CTR HLTH SCI,DEPT PHYSIOL & BIOPHYS,894 UNION AVE,MEMPHIS,TN 38163. UNIV TENNESSEE CTR HLTH SCI,DEPT COMPARAT MED,MEMPHIS,TN 38163. OFF NAVAL RES,ARLINGTON,VA 22217. TOKYO MED & DENT UNIV,INST MED & DENT ENGN,TOKYO 113,JAPAN. FU NINDS NIH HHS [NS-26429, NS-25378] NR 43 TC 50 Z9 51 U1 1 U2 6 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 1992 VL 166 IS 6 BP 1266 EP 1275 PG 10 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA JZ581 UT WOS:A1992JZ58100009 PM 1431245 ER PT J AU EDDY, CR YOUCHISON, DL SARTWELL, BD GRABOWSKI, KS AF EDDY, CR YOUCHISON, DL SARTWELL, BD GRABOWSKI, KS TI DEPOSITION OF DIAMOND ONTO ALUMINUM BY ELECTRON-CYCLOTRON RESONANCE MICROWAVE PLASMA-ASSISTED CVD SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; RAMAN-SPECTROSCOPY; LOW-PRESSURE; FILMS; TEMPERATURE; GROWTH; SCATTERING; GRAPHITE; CARBON AB Diamond crystallites and thin films have been deposited onto polycrystalline aluminum substrates utilizing an electron cyclotron resonance microwave plasma-assisted chemical vapor deposition (ECR-PACVD) method. For all depositions, the substrates were biased to +40 V dc with respect to ground and their temperature was maintained at 500-degrees-C. Similar deposits were obtained from two different feedgas systems at a total pressure of 1.33 Pa (10 mTorr). The first system consisted of a carbon monoxide (CO) and hydrogen (H-2) mixture (CO:H-2 = 20:80), and the second was a methane (CH4), oxygen (O2), and hydrogen (H-2) Mixture (CH4:O2:H-2 = 21:10:69). The deposits were subsequently characterized by scanning electron microscopy, micro-Raman spectroscopy, and x-ray diffraction. The results of these analyses indicate that polycrystalline diamond was deposited onto aluminum substrates, as both individual crystallites and continuous films. RP EDDY, CR (reprint author), USN,RES LAB,CODE 4670,WASHINGTON,DC 20375, USA. OI Youchison, Dennis/0000-0002-7366-1710; Grabowski, Kenneth/0000-0003-0816-001X NR 29 TC 17 Z9 18 U1 0 U2 0 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD DEC PY 1992 VL 7 IS 12 BP 3255 EP 3259 DI 10.1557/JMR.1992.3255 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA KB464 UT WOS:A1992KB46400011 ER PT J AU BEARD, BC SANDUSKY, HW GLANCY, BC AF BEARD, BC SANDUSKY, HW GLANCY, BC TI DEFECT DENSITY-MEASUREMENTS IN SHOCKED SINGLE-CRYSTAL AMMONIUM-PERCHLORATE BY X-RAY PHOTOELECTRON-SPECTROSCOPY SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID XPS; SIO2 AB The linewidths of x-ray photoelectron spectra have been correlated with dislocation densities in a shock-damaged crystal of ammonium perchlorate (AP). A centimeter-size AP crystal was loaded at several sites with a diamond pyramid (Vickers) indenter, creating localized strain centers. The crystal was nonuniformly damaged by a rapidly decaying shock (peak pressure of 24.4 kbar at the entry surface), recovered intact, and cleaved through the indentations. The cleaved planes permitted interior analysis of the crystal by x-ray photoelectron spectroscopy (XPS) over a pattern of 1 mm by 1 mm areas. The linewidth of the Cl(2p3/2) spectra ranged from 1.70 eV for the region of greatest visible damage to 1.22 eV for the region of no visible damage, the same linewidth as that obtained for unshocked AP (control). The observed damage was compared to photographs in the literature of gamma-ray irradiated AP crystals, for which dislocation densities were reported. This provided an approximate correlation of dislocation density versus XPS linewidth. The correlation was refined by chemically etching and determining densities on another cleaved plane in the recovered crystal. By this technique, a approximately 100X increase in dislocation density was determined for the region of greatest shock damage relative to an unshocked crystal. The strain fields associated with the impressions were found to enhance perchlorate decomposition when driven by shock. Distortion of the molecular lattice in the vicinity of a dislocation is the physical mechanism responsible for the broadening of the photoelectron lines. Ab initio calculations of the Cl(2p) energy level in the perchlorate anion predicted variations of 0.1 to 0.46 eV. Variations of this magnitude are sufficient to produce the observed linewidth broadening. C1 LOYOLA COLL,DEPT ELECTR ENGN & ENGN SCI,BALTIMORE,MD 21210. RP BEARD, BC (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 15 TC 2 Z9 2 U1 0 U2 1 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD DEC PY 1992 VL 7 IS 12 BP 3266 EP 3274 DI 10.1557/JMR.1992.3266 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA KB464 UT WOS:A1992KB46400013 ER PT J AU COOPER, KP AYERS, JD VOLD, CL AF COOPER, KP AYERS, JD VOLD, CL TI REMOVAL OF SURFACE CARBIDES FROM SPARK-MACHINED MOLYBDENUM AND TUNGSTEN SO JOURNAL OF MATERIALS SCIENCE LA English DT Article AB When reactive metals such as molybdenum and tungsten are shaped by electrical discharge machining in the kerosene-based electrolytes generally employed for the process, they become covered with a thin, multiply-melted surface layer which contains carbide phases of variable composition. This surface layer is sometimes undesirable because its chemical and mechanical properties are different from the base metals. It has been demonstrated that the carbide can be removed by a high-temperature anneal in a reducing atmosphere. The anneal also removes surface cracks on molybdenum introduced by the machining, but the heat treatments employed here did not remove surface cracks on tungsten. The high-temperature anneal had the unfortunate side effect of inducing a significant degree of grain coarsening in the metals. RP COOPER, KP (reprint author), USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375, USA. NR 4 TC 0 Z9 0 U1 1 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD DEC 1 PY 1992 VL 27 IS 23 BP 6417 EP 6425 DI 10.1007/BF00576293 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA KB748 UT WOS:A1992KB74800023 ER PT J AU IMAM, MA FENG, CR SADANANDA, K AF IMAM, MA FENG, CR SADANANDA, K TI TWINS AND LAMELLAR STRUCTURES IN THE TI-AL SYSTEM WITH MANGANESE ADDITION SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID INTERMETALLIC COMPOUND; TITANIUM ALUMINIDE; DEFORMATION RP IMAM, MA (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD DEC 1 PY 1992 VL 11 IS 23 BP 1636 EP 1638 DI 10.1007/BF00740857 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA KB749 UT WOS:A1992KB74900029 ER PT J AU SUBRAHMANYAM, MB AF SUBRAHMANYAM, MB TI WORST-CASE OPTIMAL-CONTROL OVER A FINITE-HORIZON SO JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS LA English DT Article ID INTEGRAL-INEQUALITIES; INFINITY RP SUBRAHMANYAM, MB (reprint author), USN,CTR AIR DEV,FLIGHT CONTROL,CODE 6012,WARMINSTER,PA 18974, USA. NR 16 TC 4 Z9 4 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-247X J9 J MATH ANAL APPL JI J. Math. Anal. Appl. PD DEC PY 1992 VL 171 IS 2 BP 448 EP 460 DI 10.1016/0022-247X(92)90357-J PG 13 WC Mathematics, Applied; Mathematics SC Mathematics GA KD868 UT WOS:A1992KD86800013 ER PT J AU HYBL, A GABER, BP AF HYBL, A GABER, BP TI USING A RIBBON PROGRAM TO ILLUSTRATE LIPID BILAYER PACKING SO JOURNAL OF MOLECULAR GRAPHICS LA English DT Article DE HYDROCARBON GRAPHICAL REPRESENTATIONS; LIPID RIBBON MODELS; ILLUSTRATING POLYMETHYLENE CHAINS; DRAWINGS OF BILAYERS ID PROTEIN AB We describe the use of the Priestle RIBBON program suite for the illustration of lipid bilayer packing. The hydrocarbon chains of lecithin-like molecules are representable by beta-sheet arrows. The lateral packing, packing across the bilayer midline and any twisting, bowing, or curling of the polymethylene chain are readily detectable. C1 USN,RES LAB,BIOMOLEC ENGN BRANCH,WASHINGTON,DC 20375. RP HYBL, A (reprint author), UNIV MARYLAND,SCH MED,DEPT BIOPHYS,BALTIMORE,MD 21201, USA. NR 13 TC 0 Z9 0 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0263-7855 J9 J MOL GRAPHICS JI J. Mol. Graph. PD DEC PY 1992 VL 10 IS 4 BP 253 EP 256 DI 10.1016/0263-7855(92)80078-R PG 4 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Computer Science, Interdisciplinary Applications; Crystallography; Mathematical & Computational Biology SC Biochemistry & Molecular Biology; Computer Science; Crystallography; Mathematical & Computational Biology GA KC862 UT WOS:A1992KC86200010 PM 1477000 ER PT J AU BATTEEN, ML RUTHERFORD, MJ BAYLER, EJ AF BATTEEN, ML RUTHERFORD, MJ BAYLER, EJ TI A NUMERICAL STUDY OF WIND-FORCING AND THERMAL-FORCING EFFECTS ON THE OCEAN CIRCULATION OFF WESTERN AUSTRALIA SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Article ID LEEUWIN CURRENT; INDIAN-OCEAN; EDDIES; MODELS; SHELF; SIMULATION; DYNAMICS; SOUTH AB A high-resolution, multilevel, primitive equation model is initialized with climatological data to investigate the combined effects of wind and thermal forcing on the ocean circulation off Western Australia during the austral fall and winter, corresponding to the period of strongest flow for the anomalous Leeuwin Current. This process-oriented study builds on previous modeling studies, which have elucidated the role of thermal forcing in the generation of the Leeuwin Current and eddies, by including the additional effects of wind forcing for the eastern boundary current region off Western Australia. The ocean circulation is generated by the model using a combination of density forcing from the climatological Indian Ocean thermal structure, the influx of warm low-salinity waters from the North West (NW) Shelf, and the climatological wind stress. In the first experiment (case 1), forcing by the Indian Ocean and wind stress are imposed, while in the second experiment (case 2), the additional effects of the North West (NW) Shelf waters are considered. In the absence of the NW Shelf waters (case 1), geostrophic flow, driven by the Indian Ocean thermal gradient, dominates the wind forcing at the poleward end of the domain and establishes an equatorward undercurrent and a poleward surface current (the Leeuwin Current), which accelerates poleward into the prevailing wind. Wind-forcing effects are discernible only offshore at the equatorward end of the region. The inclusion of NW Shelf waters (case 2) completely dominates the wind forcing at the equatorward end of the model. The effects of the NW Shelf waters weaken away from the source region but they continue to augment the Indian Ocean forcing, resulting in a stronger flow along the entire coastal boundary. The ocean circulation also has significant mesoscale variability. In the first experiment, both the Indian Ocean thermal structure and wind forcing lead to the dominance of barotropic (horizontal shear) instability over baroclinic (vertical shear) instability. In the second experiment, the NW Shelf waters add baroclinicity, which weakens poleward, to the Leeuwin Current and locally increase the barotropic instability near their source. Away from the source waters, where there is a mixed instability. the combined effect of the Indian Ocean thermal structure and wind forcing is stronger than the NW Shelf waters and leads to a dominance of barotropic over baroclinic instability. Several scales of eddies are found to be dominant. The forcing by the Indian Ocean and wind stress (case 1) leads to an eddy wavelength of approximately 330 km. With the inclusion of the NW Shelf waters (case 2), the wavelengths associated with mesoscale variability are approximately 150 and 330 km, consistent with observed eddy length scales. RP USN, POSTGRAD SCH, DEPT OCEANOG, MONTEREY, CA 93943 USA. RI Bayler, Eric/F-5575-2010 OI Bayler, Eric/0000-0002-9492-3310 NR 41 TC 16 Z9 16 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0022-3670 EI 1520-0485 J9 J PHYS OCEANOGR JI J. Phys. Oceanogr. PD DEC PY 1992 VL 22 IS 12 BP 1406 EP 1433 DI 10.1175/1520-0485(1992)022<1406:ANSOWA>2.0.CO;2 PG 28 WC Oceanography SC Oceanography GA KE738 UT WOS:A1992KE73800002 ER PT J AU MIED, RP KIRWAN, AD LINDEMANN, GJ AF MIED, RP KIRWAN, AD LINDEMANN, GJ TI ROTATING MODONS OVER ISOLATED TOPOGRAPHIC FEATURES SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Article ID BAROTROPIC MODONS; ATMOSPHERIC BLOCKING; ISOLATED VORTICES; DYNAMICS; EDDIES AB In this paper steadily rotating modons that are trapped over topographic features with finite horizontal length scales are described. The quasigeostrophic equation over topography is transformed to a frame rotating with angular frequency omega, and steady solutions are sought that decay monotonically outside of a circle of radius, r = r(a). These conditions are imposed upon an isolated seamount or depression of the form eta = h0[1 - (r/r(b))m] (and eta = 0 for r greater-than-or-equal-to r(b)) with primary focus on the m = 2 case. Two different scenarios result from this choice of topography and correspond to r(a)/r(b) = alpha1/2 greater-than-or-equal-to 1 or alpha1/2 less-than-or-equal-to 1. There are three solution regions compared with the usual two for rectilinear modons. Both scenarios result in a countable infinity of both radial and azimuthal modes. In addition, it is found that an axisymmetric flow with a particular form but arbitrary amplitude can be added to the basic modon multipole solutions. The angular frequency is then found as a function of alpha and this axisymmetric flow amplitude. Topographically trapped rotating modons can spin clockwise or anticlockwise. C1 OLD DOMINION UNIV, CTR COASTAL PHYS OCEANOG, NORFOLK, VA 23508 USA. RP USN, RES LAB, CTR ADV SPACE SENSING, CODE 4220, WASHINGTON, DC 20375 USA. NR 27 TC 9 Z9 9 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0022-3670 EI 1520-0485 J9 J PHYS OCEANOGR JI J. Phys. Oceanogr. PD DEC PY 1992 VL 22 IS 12 BP 1569 EP 1582 DI 10.1175/1520-0485(1992)022<1569:RMOITF>2.0.CO;2 PG 14 WC Oceanography SC Oceanography GA KE738 UT WOS:A1992KE73800010 ER PT J AU PICKETT, WE AF PICKETT, WE TI STRUCTURAL COHERENCE, FERMI SURFACES, AND ELECTRON-LATTICE COUPLING IN HIGH-TC SUPERCONDUCTORS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE SUPERCONDUCTIVITY; FERMI SURFACE; COHERENCE; PHONONS; PHASE DIAGRAM ID NORMAL STATE PROPERTIES; TRANSPORT; YBA2CU3O7; TEMPERATURE; TRANSITION; SYSTEMS; METAL AB The theoretical basis of the Eliashberg formalism of conventional superconductors is reviewed to survey it applicability (or lack of) to high T(c) compounds. Implications for the theoretical framework of several recent experimental results related to electronic and structural coherence are discussed. The emphasis is on adopting a consistent interpretation of experimental data and identifying important questions that should be addressed in the near future. A synopsis of calculations of electron-phonon coupling strength is provided. RP PICKETT, WE (reprint author), USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. NR 41 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0022-3697 EI 1879-2553 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1533 EP 1540 DI 10.1016/0022-3697(92)90140-9 PG 8 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300010 ER PT J AU MAROLDA, EJ AF MAROLDA, EJ TI THROUGH A LONG GLASS - UNITED-STATES NAVAL LEADERS AND THE CHINESE CIVIL-WAR, 1945-1950 SO JOURNAL OF STRATEGIC STUDIES LA English DT Article RP MAROLDA, EJ (reprint author), USN,CTR HIST,CONTEMPORARY HIST BRANCH,WASHINGTON,DC 20350, USA. NR 60 TC 0 Z9 0 U1 0 U2 0 PU FRANK CASS CO LTD PI LONDON PA 11 GAINSBOROUGH ROAD, LONDON, ENGLAND E11 1RS SN 0140-2390 J9 J STRATEGIC STUD JI J. Strateg. Stud. PD DEC PY 1992 VL 15 IS 4 BP 528 EP 547 DI 10.1080/01402399208437497 PG 20 WC International Relations; Political Science SC International Relations; Government & Law GA KT282 UT WOS:A1992KT28200003 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI OCEAN ACOUSTIC-SIGNAL PROCESSING - A MODEL-BASED APPROACH SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOURCE LOCALIZATION; DYNAMIC-SYSTEMS; VERTICAL ARRAY; SHALLOW-WATER AB A model-based approach is proposed to solve the ocean acoustic signal processing problem that is based on a state-space representation of the normal-mode propagation model. It is shown that this representation can be utilized to spatially propagate both modal (depth) and range functions given the basic parameters (wave numbers, etc.) developed from the solution of the associated boundary value problem. This model is then generalized to the stochastic case where an approximate Gauss-Markov model evolves. The Gauss-Markov representation, in principle, allows the inclusion of stochastic phenomena such as noise and modeling errors in a consistent manner. Based on this framework, investigations are made of model-based solutions to the signal enhancement, detection and related parameter estimation problems. In particular, a modal/pressure field processor is designed that allows in situ recursive estimation of the sound velocity profile. Finally, it is shown that the associated residual or so-called innovation sequence that ensues from the recursive nature of this formulation can be employed to monitor the model's fit to the data and also form the basis of a sequential detector. C1 USN,CTR UNDERSEAS WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5504,L-495,LIVERMORE,CA 94550, USA. NR 29 TC 33 Z9 37 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 1992 VL 92 IS 6 BP 3185 EP 3201 DI 10.1121/1.404168 PG 17 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA KB223 UT WOS:A1992KB22300015 ER PT J AU KO, SH SCHLOEMER, HH AF KO, SH SCHLOEMER, HH TI FLOW NOISE-REDUCTION TECHNIQUES FOR A PLANAR ARRAY OF HYDROPHONES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID BOUNDARY-LAYER; WALL PRESSURE; SPECTRUM; FLUCTUATIONS AB This paper presents techniques for reducing turbulent boundary layer pressure fluctuations using wave-number filters. Reduction of flow noise can be achieved by filtering wave numbers using a finite hydrophone or an array of hydrophones, or by filtering wave numbers using a layer of elastomer. The baseline turbulent wall pressure spectrum that represents the flow excitation function is based on the Corcos model modified to fit a realistic estimate at the low wave-number region. The occurrence of the convective ridge wave number is estimated by using a convective flow speed that is a function of frequency. Major results presented are numerically calculated noise reductions compared to the calculated noise level for a flush-mounted point hydrophone. RP KO, SH (reprint author), USN,CTR UNDERSEA WARFARE,NEW LONDON DETACHMENT,NEW LONDON,CT 06320, USA. NR 26 TC 14 Z9 15 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 DEC PY 1992 VL 92 IS 6 BP 3409 EP 3424 DI 10.1121/1.404191 PG 16 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA KB223 UT WOS:A1992KB22300038 ER PT J AU LICHT, S MARSH, C AF LICHT, S MARSH, C TI A NOVEL AQUEOUS ALUMINUM FERRICYANIDE BATTERY SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID ELECTROLYTES AB Aluminum ferricyanide batteries based on aqueous solution-phase alkaline ferricyanide cathodes and solid aluminum anodes are introduced and investigated. The battery is expressed by aluminum oxidation and ferricyanide reduction for an overall battery discharge consisting of Al + 3 OH- + 3Fe(CN)63- --> Al(OH)3 + 3Fe(CN)64- E(cell) = 2.8 V First generation aluminum potassium ferricyanide batteries are demonstrated with an open-circuit voltage of 2.2 V. This system produces current densities approaching 2000 MA/cm2 with polarization losses of 0.6 MV CM2 mA-1, resulting in a high power density of over 2 W/cm2, moderate energy densities of 96 Wh/kg, and coulombic efficiencies of aluminum and ferricyanide discharge in excess of 80%. C1 USN,CTR UNDERSEA WARFARE,ELECT PROPULS,NEWPORT,RI 02841. RP LICHT, S (reprint author), CLARK UNIV,DEPT CHEM,WORCESTER,MA 01610, USA. NR 13 TC 20 Z9 20 U1 1 U2 4 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD DEC PY 1992 VL 139 IS 12 BP L109 EP L111 DI 10.1149/1.2069146 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA KC336 UT WOS:A1992KC33600001 ER PT J AU FARE, TL PALMER, CA SILVESTRE, CG CRIBBS, DH TURNER, DC BRANDOW, SL GABER, BP AF FARE, TL PALMER, CA SILVESTRE, CG CRIBBS, DH TURNER, DC BRANDOW, SL GABER, BP TI LANGMUIR-BLODGETT STUDIES AND ATOMIC FORCE MICROSCOPE IMAGES OF NICOTINIC ACETYLCHOLINE-RECEPTOR FILMS SO LANGMUIR LA English DT Article ID MEMBRANES; PROTEIN; MONOLAYERS; RESOLUTION; PLATINUM; BILAYERS AB Lipid membrane composition, subphase ionic strength, and pH affect the functionality of transmembrane proteins in reconstituted systems. We present the surface pressure-area and surface potential-area curves for nicotinic acetylcholine receptor (nAChR) films and nAChR-lipid films with various lipid compositions and subphase preparations. Addition of unsaturated lipid and cholesterol caused the protein-lipid films to exhibit a more fluid phase under compression than the nAchR film itself. The choice of buffer, as well as pH, also affected film isotherms. Lipid-protein films were transferred onto silicon substrates and atomic force microscope (AFM) images were obtained. Images of the transferred protein and lipid films show the presence of protein aggregates and regular structure in the lipid layer. The sizes of the observed features are consistent with the molecular dimensions of the lipids and nAChR. C1 UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. ST MARYS COLL MARYLAND,DIV NAT SCI & MATH,ST MARYS CITY,MD 20686. RP FARE, TL (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 20 TC 18 Z9 18 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD DEC PY 1992 VL 8 IS 12 BP 3116 EP 3121 DI 10.1021/la00048a043 PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA KE137 UT WOS:A1992KE13700042 ER PT J AU NICKEL, JA AF NICKEL, JA TI PASSIVE DETECTION OF MOVING TARGETS SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article AB This provides the conditions and equations for predicting the position and velocity of a moving aircraft as detected from a second moving aircraft. C1 USN,CTR AIR DEV,WARMINSTER,PA 18974. RP NICKEL, JA (reprint author), UNIV TEXAS PERMAIN BASIN,4100 PKWY DR,ODESSA,TX 79762, USA. NR 0 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 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD DEC PY 1992 VL 16 IS 12 BP 37 EP 39 DI 10.1016/0895-7177(92)90017-F PG 3 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA KB017 UT WOS:A1992KB01700004 ER PT J AU FLIPPEN, LD AF FLIPPEN, LD TI POLYNOMIAL-BASIS MODEL-REDUCTION SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article AB A preceding companion paper [1] provides an abstract setting for the process of mathematically reducing a complicated mathematical model of a physical system to a more manageable model while preserving, in the reduced model, the appropriate fundamental laws of the original model. The polynomial-basis method of model reduction is developed in this paper using the formalism of the preceding paper as the framework for its construction. The method utilizes projection operators whose range is the span of ordinary polynomials, which serve as basis functions. As a demonstration, the method is applied to the problem of steady heat conduction in an isotropic, heterogeneous material. The method does not make explicit use of either Floquet theory or the assumption of a periodic material microstructure. Upon specialization to periodic media, however, (along with the usually accompanying assumptions) the results reduce to that known for the multiple scales perturbation method, at least to lowest (bulk property) order. In this sense, the method generalizes the multiple scales method of homogenization, since periodicity and Floquet theory are part of the underlying assumptions and implementation of multiple scales. As a special case, an explicit polynomial-basis-method solution for the alternating-layer laminate case is also obtained. RP FLIPPEN, LD (reprint author), USN, RES LAB, CODE 6380, 4555 OVERLOOK AVE SW, WASHINGTON, DC 20375 USA. NR 4 TC 0 Z9 0 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD DEC PY 1992 VL 16 IS 12 BP 121 EP 132 PG 12 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA KB017 UT WOS:A1992KB01700012 ER PT J AU LEE, D SCHULTZ, MH SIEGMANN, WL STMARY, DF AF LEE, D SCHULTZ, MH SIEGMANN, WL STMARY, DF TI A NUMERICAL MARCHING SCHEME TO COMPUTE SCATTERING IN THE OCEAN SO MATHEMATICS AND COMPUTERS IN SIMULATION LA English DT Article ID PROPAGATION AB In the study of underwater propagation of sound in an ocean environment, much effort has been expended in considering energy propagating in a designated direction. In a range-dependent ocean environment, scattering in all directions will occur, but in some ocean environments the all-direction scattering is weak and often can be ignored. For long-range propagation, keeping the cumulative weak scattering can be important. Numerical treatment of this type of scattering in a very long range presents two computational problems: (1) the required memory storage, and (2) the required computation time. In this paper, a marching technique is developed to handle the cumulative scattering, thus alleviating the memory storage problem, and an efficient numerical solution is introduced which reduces the computation time. When using a marching technique to solve this problem, one usually encounters the problem of well-posedness. In the context of the development of the numerical scheme, an approximation is made which suppresses the instability associated with the well-posedness question. Additionally, in the scheme, at large distances from the source a continuation process is employed (essentially a PE) to continue the solution, thereby modeling an actual physical environment without scattering. The theoretical formulation of a representative scattering equation and the development of the scheme for solving this equation will be discussed. Moreover, a realistic problem with weak scattering is presented to demonstrate the validity of this treatment. C1 USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. YALE UNIV,DEPT COMP SCI,NEW HAVEN,CT 06520. RENSSELAER POLYTECH INST,TROY,NY 12181. UNIV MASSACHUSETTS,DEPT MATH,AMHERST,MA 01003. NR 17 TC 3 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4754 J9 MATH COMPUT SIMULAT JI Math. Comput. Simul. PD DEC PY 1992 VL 34 IS 6 BP 525 EP 540 DI 10.1016/0378-4754(92)90039-J PG 16 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA KB592 UT WOS:A1992KB59200002 ER PT J AU BENNETT, JM AF BENNETT, JM TI RECENT DEVELOPMENTS IN SURFACE-ROUGHNESS CHARACTERIZATION SO MEASUREMENT SCIENCE AND TECHNOLOGY LA English DT Review ID SCRATCH STANDARDS; OPTICAL-SURFACES; SCATTERING; INTERFEROMETRY; MICROSCOPES; TOPOGRAPHY; REFLECTION; INSTRUMENT; LIGHT AB The paper contains an overview of evaluation techniques that are appropriate for characterizing the surface roughness of optical thin films and surfaces. These include microscopes ranging from low power optical microscopes to scanning probe microscopes that can measure the topography of individual atoms or groups of atoms, optical non-contact and mechanical contact profilers, some of which can give topographic maps of surface areas, and total integrated scattering and angle-resolved scattering that yield statistical properties of surfaces. Theories are needed to relate scattering to surface roughness; these are valid only for certain types of roughness. Examples are given showing how various surface evaluation techniques can be used for characterizing selected surfaces. RP USN, CTR AIR WARFARE, DIV WEAP, RES DEPT, MICHELSON LAB, CHINA LAKE, CA 93555 USA. NR 45 TC 72 Z9 75 U1 0 U2 22 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0957-0233 EI 1361-6501 J9 MEAS SCI TECHNOL JI Meas. Sci. Technol. PD DEC PY 1992 VL 3 IS 12 BP 1119 EP 1127 DI 10.1088/0957-0233/3/12/001 PG 9 WC Engineering, Multidisciplinary; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA KB155 UT WOS:A1992KB15500001 ER PT J AU BLOOD, CG GAUKER, ED PUGH, WM PEARSALL, DM AF BLOOD, CG GAUKER, ED PUGH, WM PEARSALL, DM TI COMPARISONS OF WARTIME AND PEACETIME DISEASE AND NONBATTLE INJURY RATES ABOARD SHIPS OF THE BRITISH-ROYAL-NAVY SO MILITARY MEDICINE LA English DT Article AB Disease and non-battle injury rates were computed for ships of the British Royal Navy which were deployed during wartime and peacetime operations. The wartime sick list admission rates were lower aboard carriers, battleships, and cruisers when compared with their counterparts deployed in peacetime; rate differences for battleships and cruisers were statistically significant (p < 0.05). Several categories of disease also yielded significant differences in the wartime/peacetime contrasts. Infections and parasitic disorders aboard carriers, skin diseases aboard battleships, and skin diseases, injuries, and generative system disorders occurring on cruisers were all lower during wartime than on peacetime deployments. Illness rates also varied by ship type, with the lowest rates evidenced aboard carriers. RP BLOOD, CG (reprint author), USN,HLTH RES CTR,OPERAT RES DEPT,MED INFORMAT SYST,POB 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 6 Z9 6 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 1992 VL 157 IS 12 BP 641 EP 644 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA KB925 UT WOS:A1992KB92500015 PM 1470374 ER PT J AU CROSS, ER WHITE, MR HERMANSEN, LA HAYES, C PUGH, WM HYAMS, KC AF CROSS, ER WHITE, MR HERMANSEN, LA HAYES, C PUGH, WM HYAMS, KC TI UPPER RESPIRATORY-DISEASE IN DEPLOYED UNITED-STATES NAVY SHIPBOARD PERSONNEL SO MILITARY MEDICINE LA English DT Article AB A study was conducted to determine the risk of upper respiratory disease among deployed U.S. Navy shipboard personnel. Between January and June 1989, a Patient Encounter Form was used to collect disease information from 10 U.S. Navy ships. Patients with a diagnosis of upper respiratory infection (URI) on initial sick-call visit were used in this study. Information on time spent in various ports and time at sea for each of the 10 ships was also collected. A classification scheme was developed to permit daily estimates of URI rates and to indicate whether the ship was in port or at sea. Of 967 cases of URI, 64.4% occurred while at sea, with an average daily rate of 0.5/1,000 crew members; 35.4% of the cases occurred while in port, with an average daily rate of 0.4/1,000 crew members. There was an increase in URI rates after 9 days at sea or in port. These data suggest that there are defined periods of increased transmission of upper respiratory infections aboard ships, both at sea and in port. RP CROSS, ER (reprint author), USN,MED RES INST,DIV EPIDEMIOL,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. NR 0 TC 7 Z9 8 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD DEC PY 1992 VL 157 IS 12 BP 649 EP 651 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA KB925 UT WOS:A1992KB92500017 PM 1470376 ER PT J AU HACKMAN, RJ HOLTZMAN, GL WALTER, PE AF HACKMAN, RJ HOLTZMAN, GL WALTER, PE TI COLOR-VISION TESTING FOR THE UNITED-STATES-NAVAL-ACADEMY SO MILITARY MEDICINE LA English DT Article AB Normal color vision is a prerequisite for admission to the United States Naval Academy. The Farnsworth Lantern (FALANT) is the Navy's definitive test for color vision. A FALANT is not available at many locations where candidates are examined, so satisfactory performance on pseudoisochromatic plates has been considered an acceptable alternative. Until recently, the Farnsworth Dichotomous Test Panel D-15 had also been used as an alternative test, but is now considered unacceptable. In the summer of 1991, a large number of candidates reported for induction who were unable to pass the FALANT. Since their screening physical examinations had been reported to show normal color vision. a shadow of doubt was cast upon the ability of the alternative tests to predict performance on the FALANT. Four hundred subjects were then tested on several color vision tests to determine if these tests could predict FALANT success. The results of this study and recommendations are presented. RP HACKMAN, RJ (reprint author), USN,MED CLIN,250 WOOD RD,ANNAPOLIS,MD 21402, USA. NR 0 TC 3 Z9 3 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 1992 VL 157 IS 12 BP 651 EP 657 PG 7 WC Medicine, General & Internal SC General & Internal Medicine GA KB925 UT WOS:A1992KB92500018 PM 1470377 ER PT J AU SMITH, S BARDWIL, MF CULP, R AF SMITH, S BARDWIL, MF CULP, R TI SUCCESSFUL TREATMENT OF MULTIPLE ORGAN SYSTEM FAILURE IN A WARTIME ENVIRONMENT - A CASE-REPORT FROM OPERATION DESERT STORM SO MILITARY MEDICINE LA English DT Article AB Military weapons produce massive traumatic injuries. Multiple organ system failure can be expected to occur frequently as a result of such injuries. This case report from the recent conflict with Iraq is representative of wartime injuries and complications and the positive impact of modern intensive care capability on such injuries. Availability of critical care in future conflicts is essential. C1 UNIV CALIF DAVIS,OAKLAND,CA. RP SMITH, S (reprint author), USN HOSP,DEPT SURG,OAKLAND,CA 94627, 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 1992 VL 157 IS 12 BP 674 EP 676 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA KB925 UT WOS:A1992KB92500025 ER PT J AU AMUNDSON, DE SUMMA, RA AF AMUNDSON, DE SUMMA, RA TI EXERTIONAL HEATSTROKE SO MILITARY MEDICINE LA English DT Letter RP AMUNDSON, DE (reprint author), USN HOSP,DEPT CRIT CARE,SAN DIEGO,CA 92134, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD DEC PY 1992 VL 157 IS 12 BP A6 EP A6 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA KB925 UT WOS:A1992KB92500002 PM 1470365 ER PT J AU AMUNDSON, DE AF AMUNDSON, DE TI EXERTIONAL COMPARTMENT SYNDROME SO MILITARY MEDICINE LA English DT Letter RP AMUNDSON, DE (reprint author), USN HOSP,DEPT CRIT CARE MED,SAN DIEGO,CA 92134, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD DEC PY 1992 VL 157 IS 12 BP A6 EP A7 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA KB925 UT WOS:A1992KB92500003 PM 1470365 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI UNCERTAIN PERCEPTIONS - UNITED-STATES COLD-WAR CRISIS DECISION-MAKING - MCCALLA,RB SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,GRAD 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 1992 VL 21 IS 3 BP 533 EP 536 PG 4 WC International Relations SC International Relations GA KK680 UT WOS:A1992KK68000027 ER PT J AU ARTIGIANI, R AF ARTIGIANI, R TI IMAGE, MUSIC, PINBALL + 'FOUCAULTS PENDULUM' BY ECO,UMBERTO SO MLN-MODERN LANGUAGE NOTES LA English DT Article; Proceedings Paper CT CONF ON FOUCAULTS PENDULUM CY APR 01, 1991 CL HAMILTON COLL, CLINTON, NY SP HAMILTON COLL, AMER ITALIAN HERITAGE ASSOC, IST ITALIANO CULTURA HO HAMILTON COLL RP ARTIGIANI, R (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 46 TC 3 Z9 3 U1 0 U2 0 PU JOHNS HOPKINS UNIV PRESS PI BALTIMORE PA JOURNALS PUBLISHING DIVISION, 2715 NORTH CHARLES ST, BALTIMORE, MD 21218-4319 SN 0026-7910 J9 MLN-MOD LANG NOTES JI MLN-Mod. Lang. Notes PD DEC PY 1992 VL 107 IS 5 BP 855 EP 876 DI 10.2307/2904821 PG 22 WC Literary Theory & Criticism SC Literature GA KM238 UT WOS:A1992KM23800005 ER PT J AU OBRIEN, TD AF OBRIEN, TD TI TROUBLING WATERS, THE FEMININE AND THE WIFE OF BATH PERFORMANCE SO MODERN LANGUAGE QUARTERLY LA English DT Article RP OBRIEN, TD (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 37 TC 0 Z9 0 U1 0 U2 0 PU DUKE UNIV PRESS PI DURHAM PA BOX 90660, DURHAM, NC 27708-0660 SN 0026-7929 J9 MOD LANG QUART JI Mod. Lang. Q. PD DEC PY 1992 VL 53 IS 4 BP 377 EP 391 PG 15 WC Literature SC Literature GA LA480 UT WOS:A1992LA48000001 ER PT J AU ALLISS, RJ RAMAN, S CHANG, SW AF ALLISS, RJ RAMAN, S CHANG, SW TI SPECIAL SENSOR MICROWAVE IMAGER (SSM/I) OBSERVATIONS OF HURRICANE HUGO (1989) SO MONTHLY WEATHER REVIEW LA English DT Article ID TROPICAL CYCLONES; RAINFALL AB Data from the Special Sensor Microwave/Imager (SSM/I) on board a Defense Meteorological Satellite Program (DMSP) spacecraft have been used to study the precipitation patterns associated with Hurricane Hugo (1989). Results indicate the intensification of Hugo was associated with increases in SSM/I-derived total latent heat release and increases in heavier rainfall rates near the storm center. This study also shows that SSM/I rainfall rates prior to the landfall of Hugo at Charleston, South Carolina, compared favorably with raingage observations. Additionally, data from the 85-GHz channel was used to monitor the extent of convection near the storm's center. As Hugo intensified, the areal coverage of deep convection increased. Furthermore, the 85-GHz brightness-temperature imagery was useful in determining the location of Hugo's low-level center. These results indicate the potential of using SSM/I data in the analysis and prediction of tropical cyclones in an operational environment. C1 N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI,BOX 8208,RALEIGH,NC 27695. USN,RES LAB,WASHINGTON,DC 20375. NR 27 TC 18 Z9 19 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 DEC PY 1992 VL 120 IS 12 BP 2723 EP 2737 DI 10.1175/1520-0493(1992)120<2723:SSMOOH>2.0.CO;2 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KD045 UT WOS:A1992KD04500002 ER PT J AU GELARO, R AF GELARO, R TI A NORMAL-MODE ANALYSIS OF RAPID TELECONNECTIONS IN A NUMERICAL WEATHER PREDICTION MODEL .1. GLOBAL ASPECTS SO MONTHLY WEATHER REVIEW LA English DT Article ID SEA-SURFACE TEMPERATURE; GENERAL-CIRCULATION MODEL; LARGE-SCALE ENVIRONMENT; CUMULUS CLOUD ENSEMBLE; SOUTHERN OSCILLATION; EQUATORIAL PACIFIC; ATMOSPHERIC RESPONSE; JANUARY CLIMATE; EL-NINO; PRIMITIVE EQUATIONS AB Global-scale interactions between the tropics and extratropics are investigated using a version of the U.S. Navy's global operational numerical weather prediction model. The primary goals of this study are 1) to demonstrate the importance of atmospheric teleconnections for medium-range numerical weather prediction and 2) to analyze the evolution and dynamic structure of the response in a sophisticated numerical forecast model. The model normal modes are used as the principal diagnostic tool for analyzing the response to sea surface temperature anomalies in the tropical Pacific. By monitoring the energy growth in the dominant horizontal and vertical modes and comparing these with conventional difference-field diagnostics, it is shown that the character of the long-term response is well established within one to two weeks after the heating anomaly is introduced. The growth rates and structures of these modes provide insights into the dynamic processes that control the model response. In the tropics, enhanced convection is clearly the dominant forcing mechanism for these modes. In the extratropics, a more complicated picture arises in which both meridionally propagating energy and in situ instabilities in the ambient flow appear to be important mechanisms for producing the observed wave patterns. The results clearly demonstrate that tropical forcing can have a significant global impact on time scales relevant to medium-range numerical weather prediction. In Part II of this study, the normal-mode diagnostic approach is extended by developing a technique for partitioning the modes according to their latitudinal variances in order to examine the tropical and extratropical responses in further detail. It is shown that the modes are a powerful and flexible tool for diagnosing the behavior of a complicated model. RP GELARO, R (reprint author), USN, RES LAB, ATMOSPHER DIRECTORIATE, MONTEREY, CA 93943 USA. NR 39 TC 1 Z9 1 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0027-0644 EI 1520-0493 J9 MON WEATHER REV JI Mon. Weather Rev. PD DEC PY 1992 VL 120 IS 12 BP 2897 EP 2913 DI 10.1175/1520-0493(1992)120<2897:ANMAOR>2.0.CO;2 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KD045 UT WOS:A1992KD04500013 ER PT J AU GELARO, R AF GELARO, R TI A NORMAL-MODE ANALYSIS OF RAPID TELECONNECTIONS IN A NUMERICAL WEATHER PREDICTION MODEL .2. TROPICAL AND EXTRATROPICAL ASPECTS SO MONTHLY WEATHER REVIEW LA English DT Article ID GENERAL-CIRCULATION MODEL AB A unique analysis is applied to the normal modes of the U.S. Navy's global operational numerical weather prediction model to investigate time-varying responses in the tropics and extratropics to tropical Pacific sea surface temperature anomalies. With this new analysis, the modes are partitioned according to their latitudinal variances. This allows the response energy to be separated into tropical and extratropical contributions. The partitioned responses are derived by grouping those modes whose fractional variance within a prescribed latitudinal band deltamu exceeds some threshold value beta. Since the parameters deltamu and beta may be chosen arbitrarily, this technique greatly increases the flexibility of the normal-mode diagnostic approach. The partitioned responses reveal distinct differences between the evolution and vertical scales of the dominant modes in the tropics and extratropics. In the tropics, the structure is dominated by the external mode and a medium-depth internal mode. The internal mode is determined by the profile of the large-scale divergence and subsequent rotational wind (Walker circulation) response driven by enhanced convection, In the extratropics, the dominant structure is equivalent barotropic. The external rotational modes grow rapidly within the extratropics in a manner that suggests that meridional propagation alone does not fully explain the growth of the extratropical response. RP GELARO, R (reprint author), USN,RES LAB,ATMOSPHER DIRECTORIATE,MONTEREY,CA 93943, USA. NR 12 TC 1 Z9 1 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 DEC PY 1992 VL 120 IS 12 BP 2914 EP 2927 DI 10.1175/1520-0493(1992)120<2914:ANMAOR>2.0.CO;2 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KD045 UT WOS:A1992KD04500014 ER PT J AU KUO, HC WILLIAMS, RT AF KUO, HC WILLIAMS, RT TI BOUNDARY EFFECTS IN REGIONAL SPECTRAL MODELS SO MONTHLY WEATHER REVIEW LA English DT Article ID LIMITED-AREA MODELS; EQUATION AB The choice of an appropriate spectral spatial discretization is governed by considerations of accuracy and efficiency. The purpose of this article is to discuss the boundary effects on regional spectral methods. In particular, we consider the Chebyshev tau and sinusoidal- or polynomial-subtracted sine-cosine expansion methods. The Fourier and Chebyshev series are used because of the orthogonality and completeness properties and the existence of fast transforms. The rate of convergence of expansions based on Chebyshev series depends only on the smoothness of the function being expanded, and not on its behavior at the boundaries. The sinusoidal- or polynomial-subtracted sine-cosine expansion Tatsumi-type methods do not, in general, possess the exponential-convergence property. This is due to the fact that the higher derivatives of the polynomial- or sinusoidal-subtracted function are not periodic in a model with time-dependent boundary conditions. The discontinuity in derivatives causes the slow convergence of the expanded series (Gibbs phenomenon). When a large disturbance is near the boundary so that derivative discontinuities in the expanded function are large, the Tatsumi-type method causes not only erroneous numerical values in the outgoing boundary, but also spurious oscillations in the incoming boundary region. When the wave is away from the boundary, low resolution in the Tatsumi-type method converges exponentially, just as with the Chebyshev tau method. High-resolution solutions of the Tatsumi-type method do not, however, yield high accuracy due to the discontinuity in higher derivatives of the expanded function. C1 USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943. NATL TAIWAN UNIV,DEPT ATMOSPHER SCI,TAIPEI,TAIWAN. OI KUO, HUNG-CHI/0000-0001-9102-5104 NR 7 TC 9 Z9 9 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 DEC PY 1992 VL 120 IS 12 BP 2986 EP 2992 DI 10.1175/1520-0493(1992)120<2986:BEIRSM>2.0.CO;2 PG 7 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KD045 UT WOS:A1992KD04500019 ER PT J AU BAILEY, MP BARTROLI, MC KANG, K CALLAHAN, AJ AF BAILEY, MP BARTROLI, MC KANG, K CALLAHAN, AJ TI ESTABLISHING RELIABILITY GOALS FOR NAVAL MAJOR-CALIBER AMMUNITION SO NAVAL RESEARCH LOGISTICS LA English DT Article AB We describe a decision process for establishing the threshold reliabilities for components of naval major-caliber ammunition. We present a measure of reliability performance, called ef*, which relates directly to the weapons system's performance in a naval gunfire support environment. We use a simulation model to establish this relationship, a regression metamodel to estimate its parameters, and a simple decision process to specify component reliability thresholds which ensure that the ammunition is mission effective. We present this article as an example of the integration of discrete event dynamic system analysis within a decision process. RP BAILEY, MP (reprint author), NAVAL POST GRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93940, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD DEC PY 1992 VL 39 IS 7 BP 877 EP 892 DI 10.1002/1520-6750(199212)39:7<877::AID-NAV3220390702>3.0.CO;2-D PG 16 WC Operations Research & Management Science SC Operations Research & Management Science GA JY888 UT WOS:A1992JY88800001 ER PT J AU REITER, RC GAMBONE, JC LENCH, JB AF REITER, RC GAMBONE, JC LENCH, JB TI APPROPRIATENESS OF HYSTERECTOMIES PERFORMED FOR MULTIPLE PREOPERATIVE INDICATIONS SO OBSTETRICS AND GYNECOLOGY LA English DT Article ID QUALITY ASSURANCE PROCESS AB Objective: To correlate the listing of multiple preoperative indications for hysterectomy with the risk of non-confirmation of the preoperative diagnosis. Methods: Records of 171 women undergoing consecutive hysterectomies for all indications at a large teaching hospital were reviewed for preoperative indication(s), compliance with published preoperative validation criteria for cases in which tissue pathology was not expected, and histologic verification of the preoperative diagnosis for cases in which tissue pathology was expected. Rates of confirmation (histologic verification plus successful compliance with validation criteria) of the preoperative diagnosis were compared between subgroups of cases in which single indications were listed (N = 124) or multiple indications were listed (N = 47) preoperatively. Results: The rate of confirmation of single indications (115 of 124 cases, 93%) was significantly higher than the rate of confirmation of even one indication in cases in which multiple indications were listed (28 of 47 cases, 60%, P < .0001; relative risk for non-confirmation of multiple indications = 1.55). Multiple indications were more likely to be listed when tissue pathology was not expected, representing 49% of validatable indications as compared with only 18% of histologically verifiable indications (P < .0001). Overall, the rate of compliance with validation criteria (70%) was significantly lower than the rate of histologic verification (90%) (P < .01). Conclusion: These data suggest that listing of multiple preoperative indications for hysterectomy is associated with both decreased appropriateness, as reflected in decreased compliance with generally accepted preoperative validation criteria, and decreased diagnostic accuracy, as reflected in lower rates of histologic verification. C1 UNIV IOWA,COLL MED,DEPT OBSTET & GYNECOL,IOWA CITY,IA 52242. UNIV CALIF LOS ANGELES,SCH MED,DEPT OBSTET & GYNECOL,LOS ANGELES,CA 90024. USN HOSP,SAN DIEGO,CA 92134. NR 9 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0029-7844 J9 OBSTET GYNECOL JI Obstet. Gynecol. PD DEC PY 1992 VL 80 IS 6 BP 902 EP 905 PG 4 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA KA566 UT WOS:A1992KA56600002 PM 1448256 ER PT J AU GAUNAURD, GC AF GAUNAURD, GC TI ACTIVE ACOUSTIC CLASSIFICATION VIA TRANSIENT RESONANCE SCATTERING SO OPTICAL ENGINEERING LA English DT Article DE AUTOMATIC TARGET RECOGNITION; ACOUSTIC TARGET RECOGNITION; RESONANCE SCATTERING; ACTIVE OBJECT CLASSIFICATION; INVERSE SCATTERING; UNDERWATER TARGET RECOGNITION ID COMPLEX-FREQUENCY POLES; SOUND SCATTERING; SPHERICAL-SHELLS; CREEPING WAVES; ELASTIC SPHERE; EXCITATION; LAMB AB The echoes reflected by a sound ping emerging from an active sonar when it interacts with a target in its path can be remotely sensed by a receiver. The presented approach capitalizes on an inverse scattering method that exploits the presence of certain resonance features in the echoes returned by targets to classify them. Classifying underwater objects is important to naval programs such as mine countermeasures (MCM) and anti-submarine warfare (ASW) to preclude wasting of ordnance on false targets. Although the classification of complex shapes is still a formidable task, considerable progress has been made in classifying simple shapes such as spheroidal or cylindrical shells. This methodology has emphasized the extraction, isolation, and labeling of resonance features hidden within the echo, but little has been said yet about how these could be used to classify a target. A couple of simple examples illustrate exactly how these resonances can be linked to the physical characteristics of the target, allowing for its unambiguous characterization. The procedure, although illustrated with active acoustics (i.e., sonar), can be extended to any active return from any sensor, including radar. C1 USN,CTR SURFACE WARFARE,RES DEPT,DAHLGREN DIV,WHITE OAK DETACHMENT,SILVER SPRING,MD 20903. NR 31 TC 2 Z9 2 U1 1 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD DEC PY 1992 VL 31 IS 12 BP 2553 EP 2561 DI 10.1117/12.60012 PG 9 WC Optics SC Optics GA KB842 UT WOS:A1992KB84200005 ER PT J AU WERBY, MF GAUNAURD, GC AF WERBY, MF GAUNAURD, GC TI STRONG RESONANCE FEATURES PRESENT IN THE ACOUSTIC SIGNATURES OF SUBMERGED ELASTIC STRUCTURES SO OPTICAL ENGINEERING LA English DT Article DE AUTOMATIC TARGET RECOGNITION; ACOUSTIC SCATTERING; ECHO-SIGNATURES; SUBMERGED SHELLS; RESONANCE SCATTERING; THICKNESS RESONANCES ID SPHERICAL-SHELLS; T-MATRIX; SCATTERING; FLUID; SPHEROIDS; WAVES AB Acoustic signals scattered from submerged elastic targets have produced interesting backscattered signals in the appropriate frequency region particularly because of the presence of resonances. Considerable work has been done for spherically and cylindrically shaped objects out to moderate frequencies for both solids and shells. Only recently, however, have researchers reported results for elongated objects such as spheroidal solids and shells. Further, the higher-frequency region for spheres has not been investigated extensively. A series of calculations that are characteristic of elongated targets or of spherical shells in the higher-frequency region are reported. Some of the discussed results involve bending resonances caused by obliquely incident plane waves on elongated objects and their relation to flexural resonances of beams; classes of resonances that are related to waves creeping along the longest and shortest meridians of a spheroid; flexural resonances (A0 resonances) for shells in the time domain near the coincidence frequency; and high-frequency thickness effects when scattering from shells, and their prediction based on flat plate theory. Several numerical examples are shown. C1 USN,CTR SURFACE WARFARE,RES DEPT,DAHLGREN DIV,WHITE OAK DETACHMENT,SILVER SPRING,MD 20903. RP WERBY, MF (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,CODE 221,BAY ST LOUIS,MS 39529, USA. NR 27 TC 1 Z9 1 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD DEC PY 1992 VL 31 IS 12 BP 2562 EP 2571 DI 10.1117/12.60011 PG 10 WC Optics SC Optics GA KB842 UT WOS:A1992KB84200006 ER PT J AU LU, XJ KATZ, A KANTERAKIS, EG CAVIRIS, NP AF LU, XJ KATZ, A KANTERAKIS, EG CAVIRIS, NP TI JOINT TRANSFORM CORRELATOR THAT USES WAVELET TRANSFORMS SO OPTICS LETTERS LA English DT Article ID TIME AB A joint transform correlation system based on wavelet transforms is introduced. The selection of wavelets and the optical wavelet transform of images enables this optical correlator to identify the specific features and distinguish similar characters. Preliminary experimental results are given. C1 SCS TELECOM INC,PORT WASHINGTON,NY 11050. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP LU, XJ (reprint author), ABN HOLOGRAPH INC,ELMSFORD,NY 10523, USA. NR 8 TC 53 Z9 53 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 DEC 1 PY 1992 VL 17 IS 23 BP 1700 EP 1702 DI 10.1364/OL.17.001700 PG 3 WC Optics SC Optics GA JZ935 UT WOS:A1992JZ93500019 PM 19798289 ER PT J AU SINGH, DJ PICKETT, WE AF SINGH, DJ PICKETT, WE TI ELECTRONIC CHARACTERISTICS OF TL2BA2CUO6 - FERMI-SURFACE, POSITRON WAVE-FUNCTION, ELECTRIC-FIELD GRADIENTS, AND TRANSPORT PARAMETERS SO PHYSICA C LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; COPPER-OXIDE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; BRILLOUIN-ZONE; MOMENTUM DISTRIBUTION; SPECIAL POINTS; ANNIHILATION; YBA2CU3O7-X; DENSITY; TL2BA2CACU2O8 AB A number of properties identifiable from the electronic bands and one-electron wavefunctions have been obtained from a well converged self-consistent calculation of the electronic structure of Tl2Ba2CuO6. The Fermi surface is found to consist of two sheets: a two-dimensional barrel surface arising from the CuO2 layer, and a three-dimensional spheroid arising from states with strong Tl-O character but actually extending throughout all layers of the structure. This feature has important implications for the transport properties, and especially for the degree of anisotropy. We compare with transport data on single crystals of Tl2Ba2CuO6. The calculated Fermi surface of the spheroid is found to be in substantial agreement with the measured period of magnetization oscillations in the de Haas-van Alphen effect by Kido et al. The positron wavefunction engulfs the CuO2 layers, making this material a promising case for mapping out with positron 2D-ACAR the layer-derived Fermi surface that is believed to be central to high-temperature superconductivity. The electric field gradients are predicted and compared with calculations for other cuprates. The Hall coefficient R(xyz)H (carrier motion on the a-b plane) is found to be positive and within a factor of 1.5 of that measured on ceramic samples, while the other non-vanishing component of the Hall tensor is predicted to be negative. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 45 TC 57 Z9 57 U1 0 U2 5 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 1992 VL 203 IS 1-2 BP 193 EP 202 DI 10.1016/0921-4534(92)90526-I PG 10 WC Physics, Applied SC Physics GA KB315 UT WOS:A1992KB31500026 ER PT J AU KRIVEC, R HAFTEL, MI MANDELZWEIG, VB AF KRIVEC, R HAFTEL, MI MANDELZWEIG, VB TI CORRELATION-FUNCTION HYPERSPHERICAL-HARMONIC CALCULATION OF THE MU-DT MOLECULAR ION SO PHYSICAL REVIEW A LA English DT Article ID PRECISE NONVARIATIONAL CALCULATION; STICKING-FRACTION CALCULATIONS; MUONIC MOLECULES; BINDING-ENERGIES; EXCITED-STATES; VARIATIONAL CALCULATIONS; CATALYZED FUSION; 3-BODY PROBLEM; GROUND-STATE; HELIUM AB Direct solution of the Schrodinger equation for the ground and excited S states of the mudt molecular ion is obtained with the help of the correlation-function hyperspherical-harmonic method. Given the proper correlation function, chosen from physical considerations, the method generates wave functions, accurate in the whole range of interparticle distances, which lead in turn to precise estimates of the expectation values of the Hamiltonian and of different functions of interparticle distances. Our results are compared with those obtained in other precision calculations. C1 J STEFAN INST,YU-61111 LJUBLJANA,YUGOSLAVIA. USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,DEPT PHYS & ASTRON,COLL PK,MD 20742. RP KRIVEC, R (reprint author), HEBREW UNIV JERUSALEM,DEPT PHYS,IL-91904 JERUSALEM,ISRAEL. NR 35 TC 12 Z9 12 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 1992 VL 46 IS 11 BP 6903 EP 6907 DI 10.1103/PhysRevA.46.6903 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KB946 UT WOS:A1992KB94600020 ER PT J AU ERICKSON, RP AF ERICKSON, RP TI LONG-RANGE DIPOLE-DIPOLE INTERACTIONS IN A 2-DIMENSIONAL HEISENBERG-FERROMAGNET SO PHYSICAL REVIEW B LA English DT Article AB It has previously been suggested by Yafet, Kwo, and Gyorgy that dipole-dipole interactions can induce long-range ferromagnetic order in the infinitely extended, isotropic two-dimensional Heisenberg ferromagnet. A crucial, though problematic, step employed in this previous investigation is the long-wavelength expansion of certain dipole sums, which are treated in a continuum approximation by replacing the sums over atomic sites by integrals. Without appealing to a continuum approximation, we are able to derive the exact leading terms of the long-wavelength expansion of the dipole sums of a square lattice. We show that the earlier approximations of Yafet, Kwo, and Gyorgy are correct, apart from terms characteristic of the symmetry of the square lattice, which are unimportant to a spin-wave theoretic discussion of ferromagnetic order, such as considered by these earlier authors. Our result supports recent studies of the effect of dipole interactions in two-dimensional spin systems which have utilized the dipole sum approximations of Yafet and co-workers. RP ERICKSON, RP (reprint author), USN,RES LAB,BRANCH CODE 6345,WASHINGTON,DC 20375, USA. NR 6 TC 13 Z9 13 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 DEC 1 PY 1992 VL 46 IS 21 BP 14194 EP 14197 DI 10.1103/PhysRevB.46.14194 PG 4 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400072 ER PT J AU ERWIN, SC PICKETT, WE AF ERWIN, SC PICKETT, WE TI THEORETICAL NORMAL-STATE TRANSPORT-PROPERTIES OF K3C60 SO PHYSICAL REVIEW B LA English DT Note ID SUPERCONDUCTING K3C60; ELECTRONIC STATES; SPECTROSCOPY; FULLERENES; METALS; KXC60 AB Lowest-order variational solutions to Bloch-Boltzmann scattering theory are used in conjunction with first-principles band-structure results to predict the normal-state resistivity, Hall coefficient, and thermopower for K3C60. These properties, their pressure coefficients, and other Fermi-liquid-related parameters are compared with the available experimental data, with the goal of evaluating the extent to which these novel superconducting materials can be understood within the Fermi-liquid picture without strong correlations. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP ERWIN, SC (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. RI Erwin, Steven/B-1850-2009 NR 30 TC 27 Z9 27 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 21 BP 14257 EP 14260 DI 10.1103/PhysRevB.46.14257 PG 4 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400089 ER PT J AU SINGH, DJ AF SINGH, DJ TI ELECTRONIC-STRUCTURE, MAGNETISM, AND STABILITY OF CO-DOPED NIAL SO PHYSICAL REVIEW B LA English DT Article ID BRILLOUIN-ZONE; MARTENSITIC-TRANSFORMATION; INTERMETALLIC COMPOUNDS; SPECIAL POINTS; TOTAL-ENERGY; AL ALLOY; SYSTEMS; STATES; PHASE AB Total-energy and electronic-structure calculations for Co-doped NiAl are reported. The energy of a substitutional Co in NiAl is found to be approximately 11 mRy. For the doping levels considered (0-25 % substitution on the transition-metal site) no evidence of structural instabilities or anomalies in elastic behavior is found. However, magnetic behavior is predicted for large Co concentrations. Strong nonrigid-band behavior is found for the doped system, and a high electronic density of states is associated with the Co atoms. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 34 TC 19 Z9 19 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 DEC 1 PY 1992 VL 46 IS 22 BP 14392 EP 14397 DI 10.1103/PhysRevB.46.14392 PG 6 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500006 ER PT J AU MERZBACHER, CI AF MERZBACHER, CI TI INFRARED REFLECTANCE OF BARIUM GALLOGERMANATE GLASSES SO PHYSICS AND CHEMISTRY OF GLASSES LA English DT Article ID SILICATE-GLASSES; ALUMINOSILICATE GLASSES; VIBRATIONAL-SPECTRA; RAMAN-SPECTRA; REFLECTIVITY; SPECTROSCOPY AB The structure of a range of glass compositions in the BaO-Ga2O3-GeO2 system has been investigated by infrared reflectance spectroscopy. Kramers-Kronig analysis was performed on the reflectance spectra in order to extract the longitudinal and transverse optic mode frequencies. Shifts in the energy of these modes are comparable to the trends previously observed in analogous aluminosilicate spectra, suggesting that the structure is also similar. No direct evidence of octahedral Ge or Ga was observed. RP MERZBACHER, CI (reprint author), USN,RES LAB,DIV OPT,WASHINGTON,DC 20375, USA. NR 32 TC 21 Z9 21 U1 0 U2 2 PU SOC GLASS TECHNOLOGY PI SHEFFIELD PA THORNTON 20 HALLAM GATE ROAD, SHEFFIELD, S YORKSHIRE, ENGLAND S10 5BT SN 0031-9090 J9 PHYS CHEM GLASSES JI Phys. Chem. Glasses PD DEC PY 1992 VL 33 IS 6 BP 233 EP 238 PG 6 WC Chemistry, Physical; Materials Science, Ceramics SC Chemistry; Materials Science GA KC462 UT WOS:A1992KC46200006 ER PT J AU ROWLAND, HL AF ROWLAND, HL TI ANOMALOUS ABSORPTION OF ELECTROMAGNETIC-RADIATION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MAGNETOTAIL BARIUM RELEASES; STRONG LANGMUIR TURBULENCE; LASER-LIGHT ABSORPTION; LARGE-LARMOR-RADIUS; INSTABILITY; SIMULATION AB Transverse structure in a plasma at the critical layer can increase the coupling between electromagnetic and electrostatic waves and lead to enhanced absorption of the radiation. Simulations show cases of nearly 90% absorption of the incident energy. A ripple across the density gradient acts to focus the incoming electromagnetic radiation in the lower density regions coupling it to electrostatic modes through the transverse density gradients. A simple model of the absorption shows good agreement with the scalings observed in the computer simulations. Part of the reflected radiation is side scattered at +/- nk(t), where k(t) is the wave number of the transverse structure. This can reduce the directly backscattered radiation to 0.6% of the incident energy. Nonlinear coupling of the electrostatic waves leads to radiation at twice the incident frequency. RP ROWLAND, HL (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1992 VL 4 IS 12 BP 3883 EP 3889 DI 10.1063/1.860345 PG 7 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700008 ER PT J AU DAHLBURG, RB ANTIOCHOS, SK ZANG, TA AF DAHLBURG, RB ANTIOCHOS, SK ZANG, TA TI SECONDARY INSTABILITY IN 3-DIMENSIONAL MAGNETIC RECONNECTION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID COHERENT NONLINEAR DESTABILIZATION; TANG VORTEX SYSTEM; TEARING MODE; COMPRESSIBLE MEDIUM; SHEET PINCH; FLOW; TURBULENCE; TRANSITION; EVOLUTION; COALESCENCE AB The transition to turbulence in three-dimensional reconnection of a magnetic neutral sheet is investigated. The transition can occur via a three-step process. First, the sheet undergoes the usual tearing instability. Second, the tearing mode saturates to form a two-dimensional quasisteady state. Third, this secondary equilibrium is itself ideally unstable when it is perturbed by three-dimensional disturbances. Most of this paper is devoted to the analysis and simulation of the three-dimensional linear stability properties of the two-dimensional saturated tearing layer. The numerical simulations are performed with a semi-implicit, pseudospectral-Fourier collocation algorithm. A three-dimensional secondary linear instability that grows on the ideal time scale is identified. An examination of the modal energetics reveals that the largest energy transfer is from the mean field to the three-dimensional field, with the two-dimensional field acting as a catalyst. Results of some high-resolution, fully nonlinear calculations that provide insight into the complete evolution of the system are then presented. During the nonlinear phase, the modes with structure in the third dimension are, in general, more energetic than the purely two-dimensional modes. The evolution is interpreted as being due to a kinking of flux tubes formed during the initial two-dimensional tearing stage. The system reorganizes itself turbulently into a new three-dimensional quasisteady state, which, however, dissipates much more energy than the two-dimensional saturated state. The present work has important implications for a wide range of astrophysical processes that are believed to involve rapid magnetic energy release. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NASA,LANGLEY RES CTR,THEORET FLOW PHYS BRANCH,HAMPTON,VA 23665. RP DAHLBURG, RB (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. RI Antiochos, Spiro/D-4668-2012 OI Antiochos, Spiro/0000-0003-0176-4312 NR 48 TC 58 Z9 58 U1 0 U2 2 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 1992 VL 4 IS 12 BP 3902 EP 3914 DI 10.1063/1.860347 PG 13 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700010 ER PT J AU MILLER, JD SCHNEIDER, RF WEIDMAN, DJ NGUYEN, KT AF MILLER, JD SCHNEIDER, RF WEIDMAN, DJ NGUYEN, KT TI PLASMA WAKE-FIELD EFFECTS ON HIGH-CURRENT RELATIVISTIC ELECTRON-BEAM TRANSPORT IN THE ION-FOCUSED REGIME SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ULTRAVIOLET-LASERS; ORGANIC-MOLECULES; ACCELERATION; IONIZATION; CHANNEL AB Modulation of the beam current has recently been observed during ion-focused regime (IFR) transport of a high-power relativistic electron beam propagating through a low-density background plasma. Injecting a high-current, high-energy electron beam into an IFR channel immersed in a background plasma induces plasma oscillations. These background plasma oscillations, induced by the rise-time portion of the beam ejecting plasma electrons from the vicinity of the beam into the background plasma, give rise to a modulated axial electric field. This field travels with the beam leading to beam energy and current oscillations. In the experiment, a 1.7 MeV, 1 kA, rise-time-sharpened electron beam is propagated on a KrF excimer laser-produced IFR channel in trimethylamine (TMA) gas, which is immersed in a low-density plasma-filled transport tube. Experimental measurements, analytical theory, and detailed computer simulations are presented demonstrating modulation of this high-current relativistic electron beam near the low-density background plasma frequency. C1 MISSION RES CORP,NEWINGTON,VA 22122. RP MILLER, JD (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 26 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1992 VL 4 IS 12 BP 4121 EP 4130 DI 10.1063/1.860319 PG 10 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700035 ER PT J AU FERNSLER, RF HUBBARD, RF SLINKER, SP AF FERNSLER, RF HUBBARD, RF SLINKER, SP TI CONDITIONING ELECTRON-BEAMS IN THE ION-FOCUSED REGIME SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LASER-IONIZED CHANNEL; HOSE INSTABILITY; PROPAGATION; ACCELERATOR; TRANSPORT AB Relativistic electron beams propagating through dense gas are subject to the resistive hose instability, a virulent kink instability that restricts the effective range of high-current beams. Previous studies have shown that the instability can be suppressed by centering the beam and tailoring its emittance prior to injection into the gas. One means of centering and tailoring a beam is to use short "conditioning" cells that operate in the low-pressure, ion-focused regime. In this paper, analytic models are developed to understand and assess the performance of such cells. RP FERNSLER, RF (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 63 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1992 VL 4 IS 12 BP 4153 EP 4165 DI 10.1063/1.860322 PG 13 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700038 ER PT J AU MANNHEIMER, W AF MANNHEIMER, W TI MORE DOLLAR FOR EQUIPMENT, LESS FOR GRAD STUDENTS SO PHYSICS TODAY LA English DT Letter RP MANNHEIMER, W (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD DEC PY 1992 VL 45 IS 12 BP 114 EP 114 DI 10.1063/1.2809936 PG 1 WC Physics, Multidisciplinary SC Physics GA KE695 UT WOS:A1992KE69500012 ER PT J AU JHA, SS RAJAGOPAL, AK AF JHA, SS RAJAGOPAL, AK TI MAGNETIC-FIELD DEPENDENCE OF TC AND TEMPERATURE-DEPENDENCE OF HC2 IN LAYERED SUPERCONDUCTORS WITH OPEN NORMAL STATE FERMI-SURFACE SO PRAMANA-JOURNAL OF PHYSICS LA English DT Article DE UPPER CRITICAL MAGNETIC FIELD; LAYERED SUPERCONDUCTORS, OPEN FERMI SURFACE ID SCATTERING; CRYSTALS AB A theoretical framework for treating the effects of magnetic field H on the pairing theory of superconductivity is considered, where the field is taken in an arbitrary direction with respect to crystal axes. This is applicable to closed, as well as open normal state Fermi surface (FS), including simple layered metals. The orbital effects of the magnetic field are treated semiclassically while retaining the full anisotropic paramagnetic contribution. Explicit calculations are presented in the limits \H\ --> \H(c2)(T)\, T approximately 0 and T --> T(c)(\H\ ), \ H \ approximately 0. Effects of weak nonmagnetic impurity scattering, without vertex corrections, have also been taken into account in a phenomenological way. The final results for the case of open FS and layered materials are found to differ considerably from those of the closed FS. For example, an important parameter, h*(T = 0) = \H(c2) (0)\/[-Tdelta\ H(c2) (T)\/deltaT]T(c0) for the case of a FS open in k(z)-direction with the k(z)-bandwidth, 4t3, very small compared to the Fermi energy, E(F), is close to 0.5906, compared to 0.7273 for the closed FS, in the clean limit. Analytical results are given for the magnetic field dependence of T(c) and the temperature dependence of H(c2) for a model of layered superconductors with widely open FS. For a set of band structure parameters for YBa2CU3O7 used elsewhere, we find reasonable values for the upper critical field H(c2)(0), the slope (dH(c2)/dT)T(c0), anisotropic coherence lengths xi(i)(T = 0), i = x, y, z, and (dT(c)/d\H\)\H\-->0. C1 USN,RES LAB,WASHINGTON,DC 20375. RP JHA, SS (reprint author), TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. NR 25 TC 1 Z9 1 U1 0 U2 1 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0304-4289 J9 PRAMANA-J PHYS JI Pramana-J. Phys. PD DEC PY 1992 VL 39 IS 6 BP 615 EP 631 DI 10.1007/BF02847280 PG 17 WC Physics, Multidisciplinary SC Physics GA KF687 UT WOS:A1992KF68700003 ER PT J AU WHITE, OR SKUMANICH, A LEAN, J LIVINGSTON, WC KEIL, SL AF WHITE, OR SKUMANICH, A LEAN, J LIVINGSTON, WC KEIL, SL TI THE SUN IN A NONCYCLING STATE SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC LA English DT Article ID CALCIUM K-LINE; MINIMUM AB Using the Baliunas and Jastrow (1990) study of cyclic variability in solar-type stars, we transform existing solar data to the stellar HK irradiance scale and examine the state of the solar chromosphere when a solar-type star shows little cyclic variability and surface magnetism. To reduce the chromospheric emission to levels for G-type stars showing no chromospheric activity cycles, not only must the Sun be free of plages and network; the brightness of the quiet chromosphere in the K line must be reduced to levels seen only in 15% of the quiet Sun area today. In contrast, the present-day level of K emission from the Sun places it in the cl ass of most active solar-type stars, far removed from a noncycling state. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NATL SOLAR OBSERV,TUCSON,AZ 85726. USAF,PHILLIPS LAB,SUNSPOT,NM 88347. RP WHITE, OR (reprint author), NATL CTR ATMOSPHER RES,HIGH ALTITUDE OBSERV,POB 3000,BOULDER,CO 80307, USA. NR 16 TC 51 Z9 51 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 SN 0004-6280 J9 PUBL ASTRON SOC PAC JI Publ. Astron. Soc. Pac. PD DEC PY 1992 VL 104 IS 682 BP 1139 EP 1143 DI 10.1086/133100 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KF116 UT WOS:A1992KF11600002 ER PT J AU BOTHUN, GD HARRIS, HC HESSER, JE AF BOTHUN, GD HARRIS, HC HESSER, JE TI DETECTION OF THE GLOBULAR-CLUSTER POPULATION AROUND NGC-7814 SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC LA English DT Article ID ON SPIRAL GALAXIES; LOCAL GROUP; VIRGO CLUSTER; SURFACE PHOTOMETRY; DISTANCE; NGC-4594; ELLIPTICALS; DISKS AB We report the statistical detection of 120 +/- 225 globular clusters in fields surrounding the edge-on S03 galaxy NGC 7814. Counts of objects are made to V = 24.5 and reach at least the peak of the globular-cluster luminosity function (GCLF). The bulge of NGC 7814 is of moderate luminosity and is highly flattened with an axial ratio of b/a = 0.48. Counts made from 0'.5-5'.0 radius in concentric rings of width 0'.5 show a clear detection of excess objects relative to the background in each annulus. Correcting for incompleteness in both magnitude and areal coverage yields a total cluster population of 498 +/- 164 within this region. We are thus confident that we have a strong detection of the globular-cluster system (GCS) of NGC 7814. Accounting for the presence of clusters that we could not detect in the inner few kpc and those that might lie outside our survey area would likely increase the total population by a factor of 2. At our assumed distance of (m - M) = 30.48, the specific frequency (S) of globulars is 7.6 +/- 3.2. The intrinsic GCLF for NGC 7814 is very poorly determined from these data but may indicate a distance 1 mag further away, in which case S would be 5.2 +/- 2.2. These values of S are typical for elliptical galaxies but are rather high compared to those of spirals. The radial distribution of globular-cluster candidates does not fall off as fast as the halo light. Excess counts in a field not centered on the minor axis can only be reconciled with the rest of the data if the GCS of NGC 7814 is highly flattened. C1 USN,OBSERV,FLAGSTAFF,AZ 86002. NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS,DOMINION ASTROPHYS OBSERV,VICTORIA V8X 4M6,BC,CANADA. RP BOTHUN, GD (reprint author), UNIV OREGON,DEPT PHYS,EUGENE,OR 97403, USA. NR 36 TC 7 Z9 7 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 SN 0004-6280 J9 PUBL ASTRON SOC PAC JI Publ. Astron. Soc. Pac. PD DEC PY 1992 VL 104 IS 682 BP 1220 EP 1229 DI 10.1086/133111 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KF116 UT WOS:A1992KF11600013 ER PT J AU XAPSOS, MA AF XAPSOS, MA TI A SPATIALLY RESTRICTED LINEAR ENERGY-TRANSFER EQUATION SO RADIATION RESEARCH LA English DT Article RP XAPSOS, MA (reprint author), USN,RES LAB,RADIAT EFFECTS BRANCH,WASHINGTON,DC 20375, USA. NR 13 TC 15 Z9 15 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 820 JORIE BOULEVARD, OAK BROOK, IL 60523 USA SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD DEC PY 1992 VL 132 IS 3 BP 282 EP 287 DI 10.2307/3578235 PG 6 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA KF780 UT WOS:A1992KF78000003 PM 1475350 ER PT J AU HULL, JE HUNTER, CS LUIKEN, GA AF HULL, JE HUNTER, CS LUIKEN, GA TI THE GROSHONG CATHETER - INITIAL EXPERIENCE AND EARLY RESULTS OF IMAGING-GUIDED PLACEMENT SO RADIOLOGY LA English DT Article DE CATHETERS AND CATHETERIZATION; CATHETERS AND CATHETERIZATION, COMPLICATIONS; CATHETERS AND CATHETERIZATION, TECHNOLOGY; ULTRASOUND (US) GUIDANCE ID CENTRAL VENOUS CATHETERS; HICKMAN CATHETERS; ACCESS; COMPLICATIONS; THROMBOSIS AB Fifty Groshong catheters were placed in 50 patients with use of ultrasound (US) and fluoroscopic guidance in the radiology suite: 49 were placed via the subclavian vein and one was placed via the left internal jugular vein. All (100%) attempts at catheter placement were successful. Imaging guidance affected the placement of catheters in 12 cases (24%), including four patients (8%) in whom vascular access would not have been possible with blinded percutaneous venipuncture or surgical cutdown. After a four-case learning curve period, during which one pneumothorax (2%) and two arterial punctures (4%) occurred, there were no further venipuncture-related complications. One catheter was removed because of infection (2%) and one because of allergic reaction (2%) to the antimicrobial cuff. Four patients with cutaneous infections and one with catheter-related sepsis were successfully treated with antibiotics. Results demonstrate the initial promise of imaging-guided placement of central venous access catheters when performed in the radiology-suite. C1 US NAVAL HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. US NAVAL HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134. RP HULL, JE (reprint author), US NAVAL HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. RI HULL, JEFFREY/N-3100-2013 OI HULL, JEFFREY/0000-0003-4094-5810 NR 19 TC 39 Z9 40 U1 0 U2 0 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 SN 0033-8419 J9 RADIOLOGY JI Radiology PD DEC PY 1992 VL 185 IS 3 BP 803 EP 807 PG 5 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JZ347 UT WOS:A1992JZ34700040 PM 1438766 ER PT J AU WORKMAN, TL BURKHARD, TK RESNICK, D GOFF, WB BALSARA, ZN DAVIS, DJ LAPOINT, JM AF WORKMAN, TL BURKHARD, TK RESNICK, D GOFF, WB BALSARA, ZN DAVIS, DJ LAPOINT, JM TI HILL-SACHS LESION - COMPARISON OF DETECTION WITH MR IMAGING, RADIOGRAPHY, AND ARTHROSCOPY SO RADIOLOGY LA English DT Article DE SHOULDER, ARTHROSCOPY; SHOULDER, INJURIES; SHOULDER, MR; SHOULDER, RADIOGRAPHY ID SHOULDER AB Magnetic resonance (MR) imaging has proved to be a valuable method for documenting Hill-Sachs lesions. The authors retrospectively analyzed the diagnostic interpretations at plain film radiography, arthroscopy, and MR imaging in 76 patients. The analysis revealed that neither radiography nor arthroscopy displayed the lesion with sufficient accuracy to represent a true standard of reference for the evaluation of MR imaging in the diagnosis of the Hill-Sachs lesion. The data from the diagnostic interpretations were analyzed in three ways, each of which revealed that findings at MR imaging were more helpful than findings at radiography and/or arthroscopy in the diagnosis of the Hill-Sachs lesion. When the agreement of findings in two or three methods was used to assign a final diagnosis, MR imaging resulted in sensitivity of 97%, specificity of 91%, and accuracy of 94% in the detection of Hill-Sachs lesions. C1 USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT ORTHOPED,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. VET ADM MED CTR,DEPT RADIOL,LA JOLLA,CA. NR 14 TC 57 Z9 58 U1 0 U2 0 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 SN 0033-8419 J9 RADIOLOGY JI Radiology PD DEC PY 1992 VL 185 IS 3 BP 847 EP 852 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JZ347 UT WOS:A1992JZ34700049 PM 1438774 ER PT J AU ROBINSON, G AF ROBINSON, G TI MUSLIM-CHRISTIAN ENCOUNTERS - PERCEPTIONS AND MISPERCEPTIONS - WATT,WM SO REVIEW OF RELIGIOUS RESEARCH LA English DT Book Review RP ROBINSON, G (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU RELIGIOUS RESEARCH ASSOC INC PI WASHINGTON PA 108 MARIST HALL, CATHOLIC UNIV AMERICA, WASHINGTON, DC 20064 SN 0034-673X J9 REV RELIG RES JI Rev. Relig. Res. PD DEC PY 1992 VL 34 IS 2 BP 189 EP 190 DI 10.2307/3511143 PG 2 WC Sociology; Religion SC Sociology; Religion GA KC065 UT WOS:A1992KC06500016 ER PT J AU VANDERMEER, RA AF VANDERMEER, RA TI MODELING MICROSTRUCTURAL EVOLUTION DURING RECRYSTALLIZATION SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID GRAIN-IMPINGEMENT; KINETICS; TRANSFORMATIONS; NUCLEATION; RECOVERY; METALS RP VANDERMEER, RA (reprint author), USN,RES LAB,CODE 63201,WASHINGTON,DC 20375, USA. NR 36 TC 14 Z9 14 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 1 PY 1992 VL 27 IS 11 BP 1563 EP 1568 DI 10.1016/0956-716X(92)90145-5 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JX702 UT WOS:A1992JX70200022 ER PT J AU VASUDEVAN, AK SADANANDA, K LOUAT, N AF VASUDEVAN, AK SADANANDA, K LOUAT, N TI RECONSIDERATION OF FATIGUE CRACK CLOSURE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 USN,RES LAB,WASHINGTON,DC 20375. FAIRFAX MAT GRP,ALEXANDRIA,VA 22310. RP VASUDEVAN, AK (reprint author), OFF NAVAL RES,CODE 1222,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 12 TC 43 Z9 43 U1 2 U2 3 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 DEC 1 PY 1992 VL 27 IS 11 BP 1673 EP 1678 DI 10.1016/0956-716X(92)90164-A PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JX702 UT WOS:A1992JX70200041 ER PT J AU PRUNER, LZ AF PRUNER, LZ TI THE NEW WAVE IN KAZAKH CINEMA SO SLAVIC REVIEW LA English DT Article RP PRUNER, LZ (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SLAVIC STUDIES PI STANFORD PA JORDAN QUAD/ACACIA, STANFORD UNIV, 125 PANAMA ST, STANFORD, CA 94305-4130 SN 0037-6779 J9 SLAVIC REV JI Slavic Rev. PD WIN PY 1992 VL 51 IS 4 BP 791 EP 801 DI 10.2307/2500140 PG 11 WC Area Studies; Humanities, Multidisciplinary SC Area Studies; Arts & Humanities - Other Topics GA KP890 UT WOS:A1992KP89000012 ER PT J AU PATENAUDE, BM AF PATENAUDE, BM TI REFORM AND REVOLUTION - THE LIFE AND TIMES OF ROBINS,RAYMOND - SALZMAN,NV SO SLAVIC REVIEW LA English DT Book Review RP PATENAUDE, BM (reprint author), US NAVAL POSTGRAD SCH,MONTEREY,CA, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SLAVIC STUDIES PI STANFORD PA JORDAN QUAD/ACACIA, STANFORD UNIV, 125 PANAMA ST, STANFORD, CA 94305-4130 SN 0037-6779 J9 SLAVIC REV JI Slavic Rev. PD WIN PY 1992 VL 51 IS 4 BP 817 EP 818 DI 10.2307/2500153 PG 2 WC Area Studies; Humanities, Multidisciplinary SC Area Studies; Arts & Humanities - Other Topics GA KP890 UT WOS:A1992KP89000025 ER PT J AU ALTMAN, EI COLTON, RJ AF ALTMAN, EI COLTON, RJ TI NUCLEATION, GROWTH, AND STRUCTURE OF FULLERENE FILMS ON AU(111) SO SURFACE SCIENCE LA English DT Article ID SCANNING TUNNELING MICROSCOPY; SOLID C60; GOLD; SURFACES; CARBON; MICA; DISLOCATIONS; BENZENE; FACES; C-60 AB The growth of fullerene films by vapor deposition on Au(111) was studied using UHV-STM, LEED, AES, and TOF-SIMS. The fullerenes were found to grow in a layer-by-layer manner. The molecules initially adsorb at intersections of multiple steps and edges of monatomic steps on narrow terraces. As the coverage is increased, periodic arrays of short chains form at steps separating wider terraces with the periodicity determined by the (23 x square-root 3)-Au(111) reconstruction. At higher coverages, hexagonal layers with a lattice constant of 1.0 nm grow out from the steps on both the upper and lower terraces. The adsorption of the fullerenes lifts the reconstruction indicating a strong interaction between the fullerenes and Au(111). STM indicates that two ordered commensurate structures predominate on the Au(111) surface: (1) a layer with a periodicity of approximately 38 Au spacings; and (2) a layer with a (2 square-root 3 x 2 square-root 3)R30-degrees unit cell. Second layer molecules were found to display no affinity for step edges. On Au(111), the second layer desorbs at 300-degrees-C, while the first layer is strongly bound and does not begin to desorb until 500-degrees-C. After annealing to 500-degrees-C the remaining C60 is largely disordered. Intramolecular structure was observed within molecules at the step edges and in the hexagonal arrays. RP ALTMAN, EI (reprint author), USN,RES LAB,DIV CHEM,CODE 6177,WASHINGTON,DC 20375, USA. NR 48 TC 256 Z9 256 U1 5 U2 84 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD DEC 1 PY 1992 VL 279 IS 1-2 BP 49 EP 67 DI 10.1016/0039-6028(92)90741-N PG 19 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA KA768 UT WOS:A1992KA76800013 ER PT J AU BROOK, I FRAZIER, EH AF BROOK, I FRAZIER, EH TI MICROBIOLOGIC FACTORS OF STUMP WOUND-INFECTION SO SURGERY GYNECOLOGY & OBSTETRICS LA English DT Article ID BACTEROIDES; BACTERIA; GROWTH; ULCERS AB Specimens from 52 patients with stump wound infection (SWI) were studied for aerobic and anaerobic bacteria. Bacterial growth was present in 44 specimens. Only aerobic or facultative bacteria were recovered in 19 specimens, only aerobic bacteria in 12 and mixed aerobic, facultative and anaerobic bacteria in 13. One hundred and three isolates were recovered (2.3 per specimen)-58 aerobic or facultative (1.3 per specimen) and 45 anaerobic (1.0 per specimen). The predominant isolates were anaerobic cocci (17), Bacteroides species (13 isolates), Staphylococcus aureus (12) and Escherichia coli (11). Polymicrobial infection occurred in 36 instances. S. aureus was more commonly isolated and anaerobic bacteria were less commonly isolated in SWI of the arms, compared with legs. These data highlight the polymicrobial aerobic-anaerobic cause of SWI. C1 USN HOSP,DEPT PEDIAT,BETHESDA,MD 20814. USN HOSP,DEPT INFECT DIS,BETHESDA,MD 20814. NR 15 TC 1 Z9 1 U1 0 U2 0 PU FRANKLIN H MARTIN FOUNDATION PI CHICAGO PA 55 E ERIE ST, CHICAGO, IL 60611 SN 0039-6087 J9 SURG GYNECOL OBSTET JI Surg. Gynecol. Obstet. PD DEC PY 1992 VL 175 IS 6 BP 548 EP 550 PG 3 WC Obstetrics & Gynecology; Surgery SC Obstetrics & Gynecology; Surgery GA KA771 UT WOS:A1992KA77100010 PM 1448736 ER PT J AU PRINZ, GA AF PRINZ, GA TI MAGNETIC-ANISOTROPY IN EPITAXIAL METAL-FILMS SO ULTRAMICROSCOPY LA English DT Article ID MOLECULAR-BEAM EPITAXY AB A pictorial tutorial is presented which illustrates how details of the metal/substrate interface affect the magnetic anisotropy of 3d transition metal films which are epitaxially grown on closely lattice-matched substrates. RP PRINZ, GA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD DEC PY 1992 VL 47 IS 4 BP 346 EP 354 DI 10.1016/0304-3991(92)90164-F PG 9 WC Microscopy SC Microscopy GA KG292 UT WOS:A1992KG29200007 ER PT J AU CHIARAMONTE, RM RICH, MA BROCK, WA AF CHIARAMONTE, RM RICH, MA BROCK, WA TI PROLAPSING CONGENITAL POLYP OF POSTERIOR URETHRA AND URETHRAL DUPLICATION ASSOCIATED WITH IMPERFORATE ANUS SO UROLOGY LA English DT Article ID BLADDER AB We report the first case of a boy with a prolapsing congenital polyp of the posterior urethra associated with urethral duplication and imperforate anus. C1 SCHNEIDER CHILDRENS HOSP,LONG ISL JEWISH MED CTR,DEPT PEDIAT UROL,NEW HYDE PK,NY 11042. USN,REG MED CTR,DEPT UROL,SAN DIEGO,CA 92134. NR 25 TC 3 Z9 3 U1 0 U2 1 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD DEC PY 1992 VL 40 IS 6 BP 522 EP 524 DI 10.1016/0090-4295(92)90407-N PG 3 WC Urology & Nephrology SC Urology & Nephrology GA KX685 UT WOS:A1992KX68500008 PM 1466105 ER PT J AU GILLS, Z IWATA, C ROY, R SCHWARTZ, IB TRIANDAF, I AF GILLS, Z IWATA, C ROY, R SCHWARTZ, IB TRIANDAF, I TI TRACKING UNSTABLE STEADY-STATES - EXTENDING THE STABILITY REGIME OF A MULTIMODE LASER SYSTEM SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHAOTIC SYSTEM AB It is shown that the unstable steady state of a multimode laser system may be stabilized by the occasional proportional feedback technique for dynamical control of chaotic systems. The range of pump excitations over which stabilization can be maintained is extended by more than an order of magnitude through application of a procedure for tracking the unstable steady state as the pump excitation is slowly varied. C1 USN,RES LAB,SPECIAL PROJECT NONLINEAR SCI,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP GILLS, Z (reprint author), GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332, USA. RI Schwartz, Ira/A-8073-2009 NR 12 TC 177 Z9 178 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 30 PY 1992 VL 69 IS 22 BP 3169 EP 3172 DI 10.1103/PhysRevLett.69.3169 PG 4 WC Physics, Multidisciplinary SC Physics GA JZ676 UT WOS:A1992JZ67600010 ER PT J AU DUNLAP, BI BALLESTER, JL SCHMIDT, PP AF DUNLAP, BI BALLESTER, JL SCHMIDT, PP TI INTERACTIONS BETWEEN C-60 AND ENDOHEDRAL ALKALI ATOMS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID GRAPHITE-INTERCALATION COMPOUNDS; SPHEROIDAL CARBON SHELLS; ELECTRONIC-STRUCTURE; ICOSAHEDRAL C-60; COMPLEXES; CLUSTERS; METAL; BUCKMINSTERFULLERENE; POTENTIALS; MOLECULES AB All-electron local-density-functional (LDF) total-energy calculations are used to study the interaction between icosahedral C60 and endohedral lithium, sodium, and potassium ions and atoms. LDF potential energies as a function of radial displacement from the center along the 5-fold and 3-fold axes of C60 suggest that the carbon shell-alkali interaction is spherically symmetric to a good approximation. At equilibrium Li+, Na+, and K+ are displaced radially outward 1.4, 0.7, and 0.0 angstrom, respectively, from the center of the ball in the ground states of both the neutral and positively-charged complexes. Excited intramolecular charge-transfer states of the neutral molecules exist in which the endohedral alkali ion is neutralized. For these electronically excited neutral molecules the equilibrium position of the alkali atom is at or very near the center of the C60 shell. A minimum in the spacing between totally-symmetric endohedral vibrational energy levels indicates a potential energy maximum at the center of the shell. The height of the potential energy maximum lies between the two corresponding vibrational energies. C1 EMPORIA STATE UNIV,DEPT PHYS,EMPORIA,KS 66801. OFF NAVAL RES,DIV CHEM & MAT,ARLINGTON,VA 22217. 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 69 TC 89 Z9 89 U1 1 U2 7 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 26 PY 1992 VL 96 IS 24 BP 9781 EP 9787 DI 10.1021/j100203a038 PG 7 WC Chemistry, Physical SC Chemistry GA KA298 UT WOS:A1992KA29800038 ER PT J AU MCCLEAN, RE PASTERNACK, L AF MCCLEAN, RE PASTERNACK, L TI KINETICS OF THE REACTIONS V(A4F3/2,A6D3/2) + OX (X = O, N, AND CO) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID TRANSITION-METAL ATOMS; GAS-PHASE; ELECTRON-AFFINITIES; OXIDATION; N2O; O2; NO; CHEMILUMINESCENCE; TITANIUM; TI(A3F) AB The gas-phase kinetics are reported for the reactions V(a4F3/2) + OX, Where X = 0, N, and CO, in the temperature range 297-643 K. V atoms were produced by the multiphoton dissociation of VCl4(g) at 193 nm and were detected by laser-induced fluorescence. Arrhenius rate expressions obtained for these reactions are k(02) = (1.20 +/- 0.26) x 10(-10) exp[-(2.16 +/- 0.19 kcal/mol)/RT] CM3 s-1, k(NO) = (2.20 +/- 0.26) x 10(-11) exp[-(0.40 +/- 0.19 kcal/mol)/RT] cm3 s-1, and k(CO2) = (4.38 +/- 0.62) x 10(-11) exp[-(2.90 +/- 0.14 kcal/mol)/RT]cm3 s-1, Also, room temperature rate constants were measured for the disappearance of the excited state V(a6D3/2) due to collisions with OX, Ar, and N2; the V* disappearance rates induced by collisions with the oxidants are found to be considerably faster than those of the ground-state atom, with rate constants (in units of CM3 s-1) k(02) = (1.34 +/- 0.21) x 10(-10), k(NO) = (1.00 +/-0.16) x 10(-10), k(CO2) = (2.17 +/- 0.35) X 10(-11), k(Ar) = (2.06 +/- 0.32) x 10(-13), and k(N2) = (5.62 +/- 0.83) x 10(-13). Quoted uncertainities are +/-2sigma. The rates of corrisional quenching are compared to the reaction rates of ground-state vanadium, and quenching mechanisms are discussed. C1 USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375. NR 27 TC 37 Z9 37 U1 0 U2 2 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 26 PY 1992 VL 96 IS 24 BP 9828 EP 9831 DI 10.1021/j100203a046 PG 4 WC Chemistry, Physical SC Chemistry GA KA298 UT WOS:A1992KA29800046 ER PT J AU WARREN, WL SEAGER, CH DIMOS, D FRIEBELE, EJ AF WARREN, WL SEAGER, CH DIMOS, D FRIEBELE, EJ TI OPTICALLY INDUCED ABSORPTION AND PARAMAGNETISM IN LEAD LANTHANUM ZIRCONATE TITANATE CERAMICS SO APPLIED PHYSICS LETTERS LA English DT Article AB Electron paramagnetic resonance (EPR) and photothermal deflection spectroscopy measurements have been performed to identify the nature of the centers responsible for the subgap absorption in both unilluminated and ultraviolet (UV) illuminated lead lanthanum zirconate titanate (PLZT) ceramics. In the PLZT ceramics we find that the absorption near 2.6 eV is correlated with the presence of Ti+3 centers. UV exposure of these ceramics leads to the generation of two charged paramagnetic defects, Pb+3 and Ti+3, as well as an increased subgap absorption. These observations demonstrate strong correlations between the UV-induced EPR and optical responses, suggesting that both are due to the same trapping centers. C1 USN,RES LAB,WASHINGTON,DC 20375. RP WARREN, WL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 21 Z9 21 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 23 PY 1992 VL 61 IS 21 BP 2530 EP 2532 DI 10.1063/1.108171 PG 3 WC Physics, Applied SC Physics GA JZ025 UT WOS:A1992JZ02500012 ER PT J AU NGAI, KL COLMENERO, J ALEGRIA, A ARBE, A AF NGAI, KL COLMENERO, J ALEGRIA, A ARBE, A TI INTERPRETATION OF ANOMALOUS MOMENTUM-TRANSFER DEPENDENCES OF LOCAL CHAIN MOTION OF POLYMERS OBSERVED BY QUASI-ELASTIC INCOHERENT NEUTRON-SCATTERING EXPERIMENTS SO MACROMOLECULES LA English DT Note ID CORRELATED SYSTEMS; RELAXATION; DYNAMICS; MODEL; NMR C1 UNIV BASQUE COUNTRY, FAC QUIM, DEPT FIS MAT, APARTADO 1072, E-20080 SAN SEBASTIAN, SPAIN. USN, RES LAB, WASHINGTON, DC 20375 USA. RI Arbe, Arantxa/G-8178-2015; Colmenero, Juan/G-8725-2015; ALEGRIA, ANGEL/H-1035-2015 OI Arbe, Arantxa/0000-0002-5137-4649; Colmenero, Juan/0000-0002-2440-4953; ALEGRIA, ANGEL/0000-0001-6125-8214 NR 29 TC 52 Z9 52 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 23 PY 1992 VL 25 IS 24 BP 6727 EP 6729 DI 10.1021/ma00050a056 PG 3 WC Polymer Science SC Polymer Science GA JZ615 UT WOS:A1992JZ61500056 ER PT J AU PAVLOPOULOS, TG BOYER, JH THANGARAJ, K SATHYAMOORTHI, G SHAH, MP SOONG, ML AF PAVLOPOULOS, TG BOYER, JH THANGARAJ, K SATHYAMOORTHI, G SHAH, MP SOONG, ML TI LASER-DYE SPECTROSCOPY OF SOME PYRROMETHENE-BF2 COMPLEXES SO APPLIED OPTICS LA English DT Article AB To improve the laser action properties of the pyrromethene-BF2 (P-BF2) complexes, we studied substitution effects at different positions of the dye molecule on the electronic spectra of several derivatives. Specifically, we used laser photoselection spectroscopy to measure the triplet-triplet (T-T) absorption and polarization spectra as well as the fluorescence and visible absorption singlet-singlet (S-S) spectra of the following compounds: 1,2,3,5,6,7,8-heptamethyl; 8-acetoxymethyl-1,3,5,7-tetramethyl-2,6-diethyl; 1,3,5,7-tetramethyl-8-p-methoxyphenyl; 3,5-dimethyl-1,7-diphenyl; and 1,3,5,7,8-pentamethyl-2,6-diphenyl P-BF2 complexes. The 1,3,5,7-tetramethyl P-BF2 complex itself exhibits weak T-T absorption, which stretches from the green to the near-IR spectral region. This band consists of two overlapping (differently polarized) T-T transitions. Short molecular axis (i.e., 8 and 1,7 positions) substitution causes the positively polarized T-T transition to gain considerably in intensity. Significantly, the negatively, long-axis-polarized T-T transition was unaffected by the long-axis 2,6-position disubstitution. Therefore, only the 2,6-position disubstitution is expected to produce superior new P-BF2 complex laser dyes. Substitution effects from strongly interacting groups with chromophores on S-S as well as T-T absorption spectra, together with cw laser photoselection spectroscopy, are briefly reviewed. C1 UNIV NEW ORLEANS,DEPT CHEM,NEW ORLEANS,LA 70148. RP PAVLOPOULOS, TG (reprint author), USN COMMAND CONTROL & OCEAN SURVEILLANCE CTR,DIV RES DEV TEST & EVALUAT,SAN DIEGO,CA 92152, USA. NR 19 TC 60 Z9 59 U1 1 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 20 PY 1992 VL 31 IS 33 BP 7089 EP 7094 PG 6 WC Optics SC Optics GA JY577 UT WOS:A1992JY57700023 ER PT J AU BERGERON, P RUIZ, MT LEGGETT, SK AF BERGERON, P RUIZ, MT LEGGETT, SK TI DISCOVERY OF 2 COOL MAGNETIC WHITE-DWARFS SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, INDIVIDUAL (LHS 1044, LHS 1734); STARS, MAGNETIC FIELDS; STARS, WHITE DWARFS ID STANDARD STARS; NOISE RATIO; HIGH SIGNAL; SPECTROPHOTOMETRY; SPECTRA AB We report the discovery of magnetism in two cool white dwarfs, LHS 1044 and LHS 1734. Optical and infrared photometry, as well as high signal-to-noise spectroscopy, are presented for both objects. The observed energy distributions along with the measured trigonometric parallaxes are used to derive the effective temperatures and surface gravities. LHS 1734, with a temperature of T(eff) = 5230 K, becomes the coolest observed magnetic white dwarf. The strength of each magnetic field is estimated from a detailed line profile analysis. Offset dipole models with dipole strengths of 16.7 and 7.3 MG, for LHS 1044 and LHS 1734, respectively, are shown to reproduce sucessfully the observed line profiles. In both objects, the dipole needs to be offset away from the observer by an amount equal to nearly one-fifth of the stellar radius. C1 USN OBSERV,FLAGSTAFF,AZ 86002. UNIV SPACE RES ASSOC,COLUMBIA,MD. UNIV CHILE,DEPT ASTRON,SANTIAGO,CHILE. RP BERGERON, P (reprint author), UNIV MONTREAL,DEPT PHYS,CP 6128,SUCC A,MONTREAL H3C 3J7,QUEBEC,CANADA. RI Ruiz, Maria Teresa/I-5770-2016; OI Ruiz, Maria Teresa/0000-0002-6799-1537; Leggett, Sandy/0000-0002-3681-2989 NR 31 TC 26 Z9 26 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 1992 VL 400 IS 1 BP 315 EP 320 DI 10.1086/171997 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JX147 UT WOS:A1992JX14700030 ER PT J AU MARR, JM RUDOLPH, AL PAULS, TA WRIGHT, MCH BACKER, DC AF MARR, JM RUDOLPH, AL PAULS, TA WRIGHT, MCH BACKER, DC TI FINE-SCALE STRUCTURE IN THE -185 KILOMETERS-PER-SECOND ABSORPTION BY HCO+ IN THE GALACTIC-CENTER SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, NUCLEI; GALAXY, CENTER ID NE-II OBSERVATIONS; SGR-A; GAS; CO; PHOTODISSOCIATION; PARSECS; GALAXY; DISK AB We present a high-resolution (8.5" x 4") study of the HCO+ (J = 1 --> 0) absorption by the " high-velocity gas" (Gusten & Downes 1981) at velocities between -170 and -200 km s-1 in Sgr A West. The absorption against the continuum radiation from the ionized gas features in Sgr A West (in particular the "bar") is stronger than it is against Sgr A* which is separated from the ionized gas by a few arcseconds. The positions of peak HCO+ opacity coincide with the positions of [Ne II] emission at these velocities (Serabyn et al. 1988). These observations suggest that, even though emission is detected from gas at these high velocities over several arcminutes, some of the absorbing molecular gas may be mixed in with the ionized ps close to Sgr A*. Simple calculations show that sufficient shielding can exist in the ionized features to allow molecules to survive very close to the ionizing source. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. UNIV CALIF BERKELEY,RADIO ASTRON LAB,BERKELEY,CA 94720. UNIV MARYLAND,DEPT ASTRON,COLL PK,MD 20742. RP MARR, JM (reprint author), HAVERFORD COLL,DEPT ASTRON,HAVERFORD,PA 19041, 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 NOV 20 PY 1992 VL 400 IS 1 BP L29 EP L32 DI 10.1086/186641 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JX148 UT WOS:A1992JX14800008 ER PT J AU KESKINEN, MJ CHATURVEDI, PK OSSAKOW, SL AF KESKINEN, MJ CHATURVEDI, PK OSSAKOW, SL TI A LOW-ALTITUDE MECHANISM FOR MESOSCALE DYNAMICS, STRUCTURE, AND CURRENT FILAMENTATION IN THE DISCRETE AURORA SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID BIRKELAND CURRENTS; ARC MODEL; INSTABILITY; OVAL; IONIZATION; IONOSPHERE; EVOLUTION; TRANSPORT; PARTICLE; PLASMA AB The two-dimensional nonlinear evolution of the ionization-driven adiabatic auroral arc instability has been studied for the first time. We find: (1) the adiabatic auroral arc instability can fully develop on time scales of tens to hundreds of seconds and on spatial scales of tens to hundreds of kilometers, (2) the evolution of this instability leads to nonlinear "hook-shaped" conductivity structures, (3) this instability can lead to parallel current filamentation over a wide range of scale sizes from kLAMBDA0 < 1 to kLAMBDA0 > 1 where k is the wavenumber and LAMBDA0 the initial arc width perpendicular to the geomagnetic field, and (4) the k-spectra of the density, electric field, and parallel current develop into inverse power laws in agreement with satellite observations. Comparison with mesoscale auroral phenomenology and current filamentation structures is made. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP KESKINEN, MJ (reprint author), USN,RES LAB,SPACE PLASMA BRANCH,CODE 6781,WASHINGTON,DC 20375, USA. NR 28 TC 2 Z9 2 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD NOV 20 PY 1992 VL 19 IS 22 BP 2199 EP 2202 DI 10.1029/92GL02491 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KA015 UT WOS:A1992KA01500004 ER PT J AU LEAN, J VANHOOSIER, M BRUECKNER, G PRINZ, D FLOYD, L EDLOW, K AF LEAN, J VANHOOSIER, M BRUECKNER, G PRINZ, D FLOYD, L EDLOW, K TI SUSIM/UARS OBSERVATIONS OF THE 120 TO 300 NM FLUX VARIATIONS DURING THE MAXIMUM OF THE SOLAR-CYCLE - INFERENCES FOR THE 11-YEAR CYCLE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID ULTRAVIOLET IRRADIANCE VARIATIONS; UV FLUX AB Since October 1991, the Solar Ultraviolet Spectral Irradiance Monitor (SUSIM) on board the upper Atmosphere Research Satellite (UARS) has been measuring the solar spectral irradiance from 120 to 400 nm with low (5 nm) and moderate (1.1 nm) resolution on a daily basis. By scaling the modulation measured over four solar rotations to proxy indicators of solar activity, we estimate the amplitude of the solar ultraviolet irradiance variation during the 11-year activity cycle, extending the wavelength coverage of existing empirical variability models to 120 nm and distinguishing the variability of the emission lines from that of the underlying solar continuum. These estimates are compared with results from another empirical variability model and from direct measurements. C1 INTERFEROMETR INC,VIENNA,VA 22181. RP LEAN, J (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7660,WASHINGTON,DC 20375, USA. NR 14 TC 28 Z9 28 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD NOV 20 PY 1992 VL 19 IS 22 BP 2203 EP 2206 DI 10.1029/92GL02656 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KA015 UT WOS:A1992KA01500005 ER PT J AU PELLEGRINO, J QADRI, SB AMIRTHARAJ, PM NGUYEN, NV COMAS, J AF PELLEGRINO, J QADRI, SB AMIRTHARAJ, PM NGUYEN, NV COMAS, J TI INTERFACE SHARPNESS IN LOW-ORDER III-V SUPERLATTICES SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 19TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 06-10, 1992 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM MET & THIN FILM ID X-RAY-DIFFRACTION; MBE; OSCILLATIONS; GAAS AB Superlattices composed of aluminum, gallium and indium are currently employed in a variety of device-related applications. Among these are edge-emitting GRINSCH lasers and vertical cavity surface emitting laser diodes. As the individual layer thickness is reduced, the role of interface sharpness becomes more critical in ensuring good two-dimensional growth. This work addresses the relationship between interface roughness and superlattice crystallinity for short-period AlAs/GaAs superlattices. Thin short-period superlattices with active layer thicknesses of 30 nm or less were also investigated to help determine the interface sharpness in the initial stages of growth. X-ray diffraction was used to assess interface roughness and to calculate superlattice periodicity. These results are compared with those obtained by reflection high energy electron diffraction (RHEED), Raman spectroscopy, and spectroscopic ellipsometry. The results indicate that interface roughness is promoted by a reduced arsenic flux growth condition at normal growth temperatures for short-period superlattices. The results also suggest that, for thin superlattices, a 10 nm buffer layer enhances interface roughness in the initial stages of growth and compromises the subsequent epilayer crystallinity. An analysis of these results in the light of structural, dynamical, and optical data is presented. C1 USN,RES LAB,DIV CONDENSED MATTER,WASHINGTON,DC 20375. RP PELLEGRINO, J (reprint author), NATL INST STAND & TECHNOL,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899, USA. NR 15 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 NOV 20 PY 1992 VL 220 IS 1-2 BP 176 EP 183 DI 10.1016/0040-6090(92)90569-W PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA KA735 UT WOS:A1992KA73500031 ER PT J AU BENNETT, JM AF BENNETT, JM TI PRECISION METROLOGY FOR STUDYING THIN-FILMS AND SURFACES SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 19TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 06-10, 1992 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM MET & THIN FILM ID SCRATCH STANDARDS; MICROSCOPES; ROUGHNESS AB Evaluation techniques that are appropriate for characterizing the surface topography of optical thin films and surfaces are briefly described. These include microscopes ranging from low power optical microscopes to scanning probe microscopes that can measure topography of individual atoms or groups of atoms, optical non-contact and mechanical contact profilers, some of which can give topographic maps of surface areas, and total integrated scattering and angle-resolved scattering that yield statistical properties of surfaces. Theories are needed to relate scattering to surface topography; these are valid only for certain types of topographies. Examples are given showing how various surface evaluation techniques can be applied to selected surfaces. RP BENNETT, JM (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,MICHELSON LAB,RES DEPT,CODE 38103,CHINA LAKE,CA 93555, USA. NR 33 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 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 20 PY 1992 VL 220 IS 1-2 BP 227 EP 233 DI 10.1016/0040-6090(92)90577-X PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA KA735 UT WOS:A1992KA73500039 ER PT J AU BINASCHI, M GIACCONE, G GAZDAR, AF DEISABELLA, P RICOTTI, GCBA CAPRANICO, G ZUNINO, F AF BINASCHI, M GIACCONE, G GAZDAR, AF DEISABELLA, P RICOTTI, GCBA CAPRANICO, G ZUNINO, F TI CHARACTERIZATION OF A TOPOISOMERASE-II GENE REARRANGEMENT IN A HUMAN SMALL-CELL LUNG-CANCER CELL-LINE SO JOURNAL OF THE NATIONAL CANCER INSTITUTE LA English DT Article ID HUMAN-LEUKEMIA-CELLS; DNA CLEAVAGE; MULTIDRUG RESISTANCE; DRUG-RESISTANCE; ETOPOSIDE; INHIBITORS; EXPRESSION; ADRIAMYCIN; AMSACRINE; IDENTIFICATION AB Background: Small-cell lung cancer (SCLC) is a highly chemosensitive tumor, but the recurrent disease that is common after initial response is often unresponsive to further chemotherapy. Although the mechanisms of drug resistance in SCLC have not been established, studies suggest that alterations of the nuclear enzyme DNA topoisomerase II may reduce the sensitivity of the cell to drug action. This enzyme is recognized as a primary target for cytotoxic activity of important antitumor agents. Purpose: In this study, we attempted to determine if altered forms of DNA topoisomerase II are responsible for reduced drug sensitivity. Methods: We characterized a rearrangement of the topoisomerase II p170 gene (also known as TOP2) in a relatively chemoresistant SCLC cell line, NCI-H69, and compared topoisomerase II expression and activity in this line with those in the chemosensitive NCI-H187 cell line. Fragments of complementary DNA from the topoisomerase II gene were generated by polymerase chain reaction. Immunodetection was accomplished by using the monoclonal antibody 7E6 against the human topoisomerase II p170 isoform. Using DNA probes corresponding to different complementary DNA regions, we showed that the rearrangement was localized at the 3'-terminus of one allele of the topoisomerase II gene. Results: In addition to the normal 6.2-kilobase (kb) topoisomerase II messenger RNA (mRNA), the NCI-H69 line expressed a 7.4-kb topoisomerase II transcript, presumably encoded by the rearranged allele. Moreover, this transcript, although longer than the normal mRNA, lacked a substantial portion of the 3'-terminal p170 gene coding sequence. Topoisomerase II activity in nuclear extracts, as determined by the P4 phage DNA-unknotting assay, was more easily detected and measured at lower NaCl concentrations in NCI-H69 than in NCI-H187 cells. Conclusion: These results are consistent with the hypothesis that the chemoresistant NCI-H69 cell line may express. in addition to the normal enzyme, an altered topoisomerase II enzyme possibly encoded by the 7.4-kb mRNA, which in turn may be transcribed from the rearranged gene allele. Implication: These observations emphasize the role of topoisomerase II in determining drug sensitivity and suggest that such gene rearrangements may contribute to resistance of SCLC cells to topoisomerase II inhibitors. C1 IST NAZL STUDIO & CURA TUMORI,DIV EXPTL ONCOL B,I-20133 MILAN,ITALY. CNR,IST GENET BIOCHIM & EVOLUZ,I-27100 PAVIA,ITALY. NCI,DIV CANC TREATMENT,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. RI Capranico, Giovanni/K-1678-2014; Giaccone, Giuseppe/E-8297-2017 OI Capranico, Giovanni/0000-0002-8708-6454; Giaccone, Giuseppe/0000-0002-5023-7562 NR 41 TC 22 Z9 22 U1 0 U2 1 PU NATL CANCER INSTITUTE PI BETHESDA PA 9030 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0027-8874 J9 J NATL CANCER I JI J. Natl. Cancer Inst. PD NOV 18 PY 1992 VL 84 IS 22 BP 1710 EP 1716 DI 10.1093/jnci/84.22.1710 PG 7 WC Oncology SC Oncology GA JY177 UT WOS:A1992JY17700011 PM 1331483 ER PT J AU GUTIERREZ, CJ KREBS, JJ PRINZ, GA AF GUTIERREZ, CJ KREBS, JJ PRINZ, GA TI EPITAXIAL BCC FEXCO1-X ALLOY-FILMS ON ZNSE(001) SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; MAGNETIC-PROPERTIES; ELECTRONIC-STRUCTURE; CO AB Molecular beam epitaxy has been used to fabricate high-quality bcc FexCo1-x(001) ferromagnetic alloy films on ZnSe-epilayered GaAs substrates spanning both the thermodynamically allowed bcc regime (0.25 < x less-than-or-equal-to 1) and the epitaxy-extended metastable bcc regime (0 less-than-or-equal-to x less-than-or-equal-to 0.25). Film growth was monitored by reflection high energy electron diffraction (RHEED) and Auger electron spectroscopy, and the concentration-dependent magnetic properties of these alloy films were characterized by ferromagnetic resonance and vibrating sample magnetometry. It was observed that the RHEED characteristics of the alloy films generally are superior to those of similarly grown pure Fe(001) films. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 17 TC 33 Z9 33 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 16 PY 1992 VL 61 IS 20 BP 2476 EP 2478 DI 10.1063/1.108157 PG 3 WC Physics, Applied SC Physics GA JY227 UT WOS:A1992JY22700034 ER PT J AU KAO, YL CHANG, EL CHONG, PLG AF KAO, YL CHANG, EL CHONG, PLG TI UNUSUAL PRESSURE-DEPENDENCE OF THE LATERAL MOTION OF PYRENE-LABELED PHOSPHATIDYLCHOLINE IN BIPOLAR LIPID VESICLES SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID EXCIMER FLUORESCENCE; FOURIER-TRANSFORMS; BILAYER-MEMBRANE; PHASE; MODEL; PHOSPHOLIPIDS; LIPOSOMES; BACTERIA C1 MEHARRY MED COLL,DEPT BIOCHEM,NASHVILLE,TN 37208. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 25 TC 24 Z9 25 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 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD NOV 16 PY 1992 VL 188 IS 3 BP 1241 EP 1246 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JY446 UT WOS:A1992JY44600040 PM 1445356 ER PT J AU PERRY, AJ VALVODA, V RAFAJA, D WILLIAMSON, DL SARTWELL, BD AF PERRY, AJ VALVODA, V RAFAJA, D WILLIAMSON, DL SARTWELL, BD TI ON THE RESIDUAL-STRESS AND PICOSTRUCTURE OF TITANIUM NITRIDE FILMS .1. IMPLANTATION WITH ARGON OR KRYPTON SO SURFACE & COATINGS TECHNOLOGY LA English DT Article ID X-RAY-DIFFRACTION; INERT-GAS BUBBLES; ION-BOMBARDMENT; LATTICE IMAGES; XENON BUBBLES; THIN-FILMS; TIN FILMS; ALUMINUM; DEPOSITION; MICROSTRUCTURE AB Titanium nitride films, dual energy ion implanted with argon or krypton, have been studied with a Seemann-Bohlin fine focus goniometer at grazing angles in the range 2-10-degrees. The implantation of 1 % of either gas has little effect on the lattice parameters or the residual stress. It is thought that the gas atoms are on substitutional lattice sites and are associated with vacancies created during the implantation process. At 4 % of implanted gas, it precipitates out in the form of bubbles; in the case of argon these are crystalline and their lattice parameter is close to that for solid argon as recorded in the literature. The lattice parameters and the residual stresses are affected slightly by the implantation: argon reduces the former and makes the latter more tensile, whereas the krypton has the opposite effects. It is thought that the difference in behavior is due to a difference in size of the bubbles or to the greater compressibility of argon. C1 VAC TEC SYST INC, BOULDER, CO 80301 USA. CHARLES UNIV, CS-12116 PRAGUE 6, CZECHOSLOVAKIA. COLORADO SCH MINES, DEPT PHYS, GOLDEN, CO 80401 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. OI Rafaja, David/0000-0003-2411-7425 NR 46 TC 33 Z9 33 U1 1 U2 6 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 NOV 16 PY 1992 VL 54 IS 1-3 BP 180 EP 185 DI 10.1016/0257-8972(92)90159-8 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA585 UT WOS:A1992KA58500030 ER PT J AU QADRI, SB KIM, C TWIGG, M MOON, D AF QADRI, SB KIM, C TWIGG, M MOON, D TI ION-BEAM DEPOSITION OF ZR-AL MULTILAYERS AND THEIR STRUCTURAL-PROPERTIES SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 19TH INTERNATIONAL CONF ON METALLURGICAL COATINGS AND THIN FILMS CY APR 06-10, 1992 CL SAN DIEGO, CA SP AMER VACUUM SOC, DIV VACUUM MET & THIN FILM ID SUPER-LATTICES; FILMS; ANOMALIES; DYNAMICS AB Multilayers of Zr-Al have been deposited using a dual ion-beam deposition technique. Low angle X-rav diffraction shows the compositional modulation of these multilayers. The period obtained from the X-ray diffraction peaks was in agreement with the period obtained from X-ray fluorescence and electron microscopy measurements. The as-deposited Al film was crystalline, whereas both the as-deposited Zr film and Zr-Al multilayer film were amorphous. RP QADRI, SB (reprint author), USN,RES LAB,CODE 4683,WASHINGTON,DC 20375, USA. NR 14 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV 16 PY 1992 VL 54 IS 1-3 BP 335 EP 337 DI 10.1016/0257-8972(92)90184-C PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA585 UT WOS:A1992KA58500055 ER PT J AU SARTWELL, BD MCGUIRE, GE HOFMANN, S AF SARTWELL, BD MCGUIRE, GE HOFMANN, S TI 19TH INTERNATIONAL-CONFERENCE ON METALLURGICAL COATINGS AND THIN-FILMS, SAN-DIEGO, CA, USA, APRIL 6-10, 1992 .1. SO SURFACE & COATINGS TECHNOLOGY LA English DT Editorial Material C1 MICROELECTR CTR,RES TRIANGLE PK,NC 27709. MAX PLANCK INST MET RES,INST WERKSTOFFWISSENSCH,W-7000 STUTTGART 80,GERMANY. RP SARTWELL, BD (reprint author), USN,RES LAB,CODE 4675,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV 16 PY 1992 VL 54 IS 1-3 BP R5 EP R5 PG 1 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA585 UT WOS:A1992KA58500001 ER PT J AU KARLE, JM KARLE, IL AF KARLE, JM KARLE, IL TI STRUCTURE OF 9-EPIQUININE HYDROCHLORIDE DIHYDRATE VERSUS ANTIMALARIAL ACTIVITY SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID MALARIA; MONOHYDRATE; MEFLOQUINE; QUININE AB 9-Epiquinine hydrochloride dihydrate [(9S)-6'-methoxycinchonan-9-ol hydrochloride dihydrate], C20H25N2O2+.Cl-.2H2O, M(r) = 396.9, orthorhombic, P2(1)2(1)2(1), a = 8.059 (2), b = 11.537 (3), c = 22.311 (6) angstrom, V = 2074.1 (9) angstrom3, Z = 4, D(x) = 1.271 g cm-3, Cu Kalpha, lambda = 1.54178 angstrom, mu = 18.58 cm-1, F(000) = 848, room temperature, final R = 6.56% for 1344 reflections with \F(o)\ > 3sigma(F). Epiquinine crystallized as a hydrated tertiary amine 9-hydrochloride salt. The intramolecular N(1)+...O distance is 2.816 angstrom. All H atoms attached to O or N atoms form intermolecular hydrogen bonds. The Cl ion is involved in four hydrogen bonds including one with the hydroxyl group of 9-epiquinine. The N(l)+-H moiety hydrogen bonds to a water molecule. The O(12)-C(9)...N(1)+-H(1) torsion angle was equal to - 0.2 (3.8)-degrees in comparison to 97.0-degrees for quinidine sulfate [Karle & Karle (1981). Proc. Natl Acad. Sci. USA, 78, 5938-5941]. Two theories have been proposed in the literature to explain the low antimalarial activity of 9-epiquinine. The crystal structure of 9-epiquinine hydrochloride is not consistent with the hypothesis that 9-epiquinine prefers to form intramolecular rather than intermolecular hydrogen bonds, but is consistent with the hypothesis that N(1) and the hydroxyl group of 9-epiquinine are in an orientation which is unfavorable towards exerting antimalarial activity. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP KARLE, JM (reprint author), WALTER REED ARMY INST RES,DEPT PHARMACOL,DIV EXPTL THERAPEUT,WASHINGTON,DC 20307, USA. NR 17 TC 9 Z9 9 U1 1 U2 2 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 1992 VL 48 BP 1975 EP 1980 DI 10.1107/S0108270192002373 PN 11 PG 6 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA KA452 UT WOS:A1992KA45200021 PM 1457075 ER PT J AU LUDWIG, M HARTZMAN, RJ AF LUDWIG, M HARTZMAN, RJ TI VIDEO ANALYSIS OF DNA-SEQUENCE HOMOLOGIES SO ANALYTICAL CHEMISTRY LA English DT Article ID HYBRIDIZATION AB A method for the rapid quantitative analysis of dot blot assays is presented. A video camera, an NTSC compatible frame grabber board, and an AT personal computer are used to read photographic exposures of the assay plate. Image processing and image analysis techniques are used to calculate the orientation of the dot raster and then to compensate for the effect of variations in field illumination on measurements of local contrast. Local contrast (between dots and background) is an exponential function of the amount of hybridization between blotted DNA and complimentary oligonucleotide probes. The amount of hybridization between blotted DNA and oligonucleotide probes of known sequence is the criteria used to establish HLA-DR tissue types. Although the assay described here utilizes a chemiluminescent reaction, this algorithm may bo used to read any assay that produces a rectangular raster of dots. C1 USN,MED RES INST,CW BILL YOUNG MARROW DONOR RECRUITMENT & RES PROGRAM,BETHESDA,MD 20889. RP LUDWIG, M (reprint author), GEORGETOWN UNIV,SCH MED,DEPT PEDIAT,WASHINGTON,DC 20007, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD NOV 15 PY 1992 VL 64 IS 22 BP 2678 EP 2681 DI 10.1021/ac00046a005 PG 4 WC Chemistry, Analytical SC Chemistry GA JY171 UT WOS:A1992JY17100005 PM 1294004 ER PT J AU HINSHELWOOD, D AF HINSHELWOOD, D TI DEVELOPMENT OF WALL-STABILIZED Z DISCHARGES FOR INTENSE ION-BEAM TRANSPORT IN INERTIAL CONFINEMENT FUSION FACILITIES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID Z-PINCH PLASMA; PARTICLES; CHANNELS; LENS AB The wall-stabilized z discharge has been scaled successfully to the parameters required for a light-ion-beam-driven inertial confinement fusion facility. The electrical behavior of discharges with various gas species, pressures, lengths, and currents has been investigated. These investigations identify the required dielectric strength of the discharge channel wall. A low-mass, low-Z wall construction with sufficient dielectric strength is demonstrated. The discharge internal dynamics have been studied using temporal and imaging interferometry, framing photography, magnetic-field measurement, and spectroscopy. The discharge current radial profile, and its dependence on discharge parameters, has been diagnosed. The discharge consists of a magnetohydrodynamically stable, imploding thick annulus. The observed radial profile explains data from previous transport experiments. Contamination of the discharge by wall material is found to be negligible during the times of interest. These observations motivate a zero-dimensional model of discharge behavior. This model reproduces approximately both the discharge dynamics and the electrical characteristics over a range of parameters. Calculations indicate that the beam ions will lose only 10% of their energy during transport through the discharge in a fusion facility. A conceptual design for a z-discharge transport system is presented. The results of this work confirm that wall-stabilized z-discharge transport is a viable, backup approach to transport in a light-ion-beam-driven inertial confinement fusion facility. C1 JAYCOR,VIENNA,VA 22182. RP HINSHELWOOD, D (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 39 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1992 VL 72 IS 10 BP 4581 EP 4596 DI 10.1063/1.352112 PG 16 WC Physics, Applied SC Physics GA JX766 UT WOS:A1992JX76600011 ER PT J AU PAPANICOLAOU, NA JONES, SH JONES, JR ANDERSON, WT SILLMON, RS AF PAPANICOLAOU, NA JONES, SH JONES, JR ANDERSON, WT SILLMON, RS TI HIGH-TEMPERATURE CHARACTERISTICS OF AMORPHOUS TIWSIX NONALLOYED OHMIC CONTACTS TO GAAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID N-GAAS AB This article reports on amorphous (alpha) nonalloyed TiWSix ohmic contacts on n-GaAs using an intervening graded-band-gap layer of InxGa1-xAs grown by the low pressure organometallic chemical vapor deposition method. The metal silicide contacts consisted of extremely thin alternating layers of TiW and Si sequentially deposited by rf magnetron sputtering to a total thickness of 500 angstrom. The as-deposited contacts exhibited ohmic behavior without requiring post-deposition heat treatment, and yielded specific contact resistivity values as low as 9 X 10(-7) OMEGA cm2. These contacts were shown to be stable and retained excellent surface morphology after 600-degrees-C thermal annealing. Rutherford backscattering and Auger electron spectroscopy investigations revealed no apparent interdiffusion at the metal/semiconductor interface under the above annealing conditions. C1 UNIV VIRGINIA, DEPT ELECT ENGN, CHARLOTTESVILLE, VA 22903 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 11 TC 3 Z9 3 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1992 VL 72 IS 10 BP 4954 EP 4957 DI 10.1063/1.352064 PG 4 WC Physics, Applied SC Physics GA JX766 UT WOS:A1992JX76600070 ER PT J AU SOTO, MR PAGE, M AF SOTO, MR PAGE, M TI ABINITIO VARIATIONAL TRANSITION-STATE-THEORY REACTION-RATE CALCULATIONS FOR THE GAS-PHASE REACTION H+HNO-]H2+NO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ELECTRONIC-STRUCTURE METHODS; HIGHER ENERGY DERIVATIVES; DESCENT REACTION PATHS; COMBUSTION; CHEMISTRY AB We report ab initio calculations of the potential-energy surface and variational transition-state-theory calculations of the temperature dependence of the reaction rate for the chemical reaction H + HNO --> H-2 + NO- This reaction is very exothermic and proceeds nearly without activation. Steepest-descent reaction pathways on the potential-energy surface for the abstraction reaction are presented both at the five-electron, five-orbital complete-active-space self-consistent-field level, and at the single- and double-substitution configuration-interaction level. Multireference configuration-interaction calculations are reported for several points along each of the reaction pathways. All electronic structure calculations employ a correlation consistent polarized valence double-zeta basis set. Canonical variational transition-state-theory calculations using the calculated potential-energy surface information predict a rate constant for this reaction that is an order of magnitude greater than that predicted previously by flame experiments. Our calculated rate constant is well represented by the three-parameter expression, k (T) = 7.406 X 10(-13) T0.720 exp(-0.655/0.001 99 T) cm3 molecules-1 s-1 over the range 200-3000 K. RP SOTO, MR (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 30 TC 45 Z9 45 U1 2 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 NOV 15 PY 1992 VL 97 IS 10 BP 7287 EP 7296 DI 10.1063/1.463501 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JY567 UT WOS:A1992JY56700026 ER PT J AU BOURKE, RH MCLAREN, AS AF BOURKE, RH MCLAREN, AS TI CONTOUR MAPPING OF ARCTIC BASIN ICE DRAFT AND ROUGHNESS PARAMETERS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SEA-ICE; THICKNESS DISTRIBUTION; SEASONAL-VARIATIONS; SUBMARINE SONAR; CANADA BASIN; PROFILES; TOPOGRAPHY; STRAIT; MOTION; OCEAN AB A data base of ice draft and roughness parameters has been constructed for selected portions of the Arctic Ocean based upon analysis of under-ice draft distribution data acquired by inverted echo sounder systems on submarines. From the voyages of 12 submarines which traversed the Alaskan, Canadian, and central Arctic regions of the Arctic Ocean during the summer and winter seasons, a series of mean ice draft and deep-draft keel statistics was calculated for 50-km segments along each submarine track. Contour maps of the mean ice draft, its standard deviation, the mean keel draft, and the spatial frequency of ice keels were constructed. They show that the greatest ice drafts, the roughest ice, and the greatest number of deep-draft keels are found off the north coasts of the Canadian Archipelago and Greenland due to ice convergence on these land barriers. C1 UNIV COLORADO,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309. RP BOURKE, RH (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 31 TC 51 Z9 52 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD NOV 15 PY 1992 VL 97 IS C11 BP 17715 EP 17728 DI 10.1029/92JC01857 PG 14 WC Oceanography SC Oceanography GA JZ339 UT WOS:A1992JZ33900001 ER PT J AU CARROLL, TL TRIANDAF, I SCHWARTZ, I PECORA, L AF CARROLL, TL TRIANDAF, I SCHWARTZ, I PECORA, L TI TRACKING UNSTABLE ORBITS IN AN EXPERIMENT SO PHYSICAL REVIEW A LA English DT Article AB We present a continuation method for experimentally tracking unstable periodic orbits by slowly varying an available system parameter in a dynamical system. The method does not depend on an explicit model, but on the signal analysis of a measured time series. Unstable periodic orbits can be tracked through various bifurcations. We apply this to a Duffing-like circuit and compare the results to an approximate model of the circuit. RP CARROLL, TL (reprint author), USN,RES LAB,CODE 6341,WASHINGTON,DC 20375, USA. RI Schwartz, Ira/A-8073-2009; OI Carroll, Thomas/0000-0002-2371-2049 NR 15 TC 83 Z9 86 U1 0 U2 6 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 1992 VL 46 IS 10 BP 6189 EP 6192 DI 10.1103/PhysRevA.46.6189 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JZ678 UT WOS:A1992JZ67800019 ER PT J AU COUCHMAN, L OTT, E ANTONSEN, TM AF COUCHMAN, L OTT, E ANTONSEN, TM TI QUANTUM CHAOS IN SYSTEMS WITH RAY SPLITTING SO PHYSICAL REVIEW A LA English DT Article AB We consider wave systems in which rays split on reflection from sharp boundaries. Examples include the Schrodinger equation with the potential changing discontinuously across a surface, electromagnetic waves in a region with a discontinuous dielectric constant, elastic media with a clamped or free boundary, etc. By introducing a Monte Carlo treatment of the rays, it is possible to define chaotic rays via the standard Lyapunov number criterion. Numerical implementation of the Monte Carlo ray technique is carried out for the example of elastic media, and is utilized to investigate the extent to which these systems are globally ergodic. It is suggested that results from previous extensive work on quantum chaos without ray splitting can be extended to these ray splitting problems. In particular, we indicate a generalization of the Gutzwiller trace formula to cover ray splitting. C1 UNIV MARYLAND,DEPT ELECT ENGN,PLASMA RES LAB,COLL PK,MD 20742. UNIV MARYLAND,DEPT PHYS,COLL PK,MD 20742. RP COUCHMAN, L (reprint author), USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375, USA. RI O, E/F-1630-2015; Antonsen, Thomas/D-8791-2017 OI Antonsen, Thomas/0000-0002-2362-2430 NR 13 TC 65 Z9 67 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 1992 VL 46 IS 10 BP 6193 EP 6210 DI 10.1103/PhysRevA.46.6193 PG 18 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JZ678 UT WOS:A1992JZ67800020 ER PT J AU WHITTUM, DH LAMPE, M JOYCE, G SLINKER, SP YU, SS SHARP, WM AF WHITTUM, DH LAMPE, M JOYCE, G SLINKER, SP YU, SS SHARP, WM TI FLUTE INSTABILITY OF AN ION-FOCUSED SLAB ELECTRON-BEAM IN A BROAD PLASMA SO PHYSICAL REVIEW A LA English DT Article ID LASER-IONIZED CHANNEL; HOSE INSTABILITY; TRANSVERSE OSCILLATIONS; REGIME; PROPAGATION; ACCELERATOR; TRANSPORT AB An intense relativistic electron beam with an elongated cross section, propagating in the ion-focused regime through a broad, uniform, unmagnetized plasma, is shown to suffer a transverse flute instability. This instability arises from the electrostatic coupling between the beam and the plasma electrons at the ion-channel edge. The instability is found to be absolute and the asymptotic growth of the flute amplitude is computed in the "frozen-field" approximation and the large skin-depth limit. The minimum growth length is shown to be much less than the betatron period, with the consequence that focusing is rendered ineffective. It is further shown that growth is much reduced when the beam propagates through a narrow channel where the ion density greatly exceeds that of the surrounding plasma. In this limit, a modest spread in betatron frequency produces rapid saturation. The effect of plasma electron collisions is also considered. Results of beam breakup simulations are noted. C1 USN,RES LAB,WASHINGTON,DC 20375. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WHITTUM, DH (reprint author), NATL LAB HIGH ENERGY PHYS,1-1 OHO,OHO,IBARAKI 305,JAPAN. NR 47 TC 12 Z9 12 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 1992 VL 46 IS 10 BP 6684 EP 6699 DI 10.1103/PhysRevA.46.6684 PG 16 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JZ678 UT WOS:A1992JZ67800067 ER PT J AU KRALL, J TANG, CM SWYDEN, T AF KRALL, J TANG, CM SWYDEN, T TI NUMERICAL-SIMULATION OF THE ELECTROMAGNETIC-INSTABILITY OF AN INTENSE BEAM IN A QUADRUPOLE FOCUSING SYSTEM SO PHYSICAL REVIEW A LA English DT Note ID ACCELERATOR AB Discrete quadrupole focusing systems are subject to an electromagnetic instability wherein the growing transverse motion of the beam interacts with the quadrupole field and the TE11 waveguide mode, We study this via three-dimensional particle simulation. We find evidence of the instability, with growth rates and frequencies in reasonable agreement with theory. The instability is found to saturate at a low amplitude, however, and has no discernable effect on the macroscopic properties of the beam. RP KRALL, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV 15 PY 1992 VL 46 IS 10 BP 6750 EP 6753 DI 10.1103/PhysRevA.46.6750 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JZ678 UT WOS:A1992JZ67800078 ER PT J AU PFEIFFER, S HEPPKE, G RAO, DSS SHASHIDHAR, R AF PFEIFFER, S HEPPKE, G RAO, DSS SHASHIDHAR, R TI CONTINUOUS THERMODYNAMIC PATH BETWEEN 3 SMECTIC-A PHASES OF THE SAME SYMMETRY SO PHYSICAL REVIEW A LA English DT Note ID CRITICAL-POINT; LIQUID-CRYSTALS AB Observation of a continuous thermodynamic path between smectic-A1 and smectic-A2 phases is reported. This path follows a continuous evolution from smectic-A1 to smectic-A(d) in the vicinity of a closed-loop nematic domain and then from smectic-A(d) to smectic-A2 in the neighborhood of a smectic-A(d)-smectic-A2 critical point. C1 TECH UNIV BERLIN, IWAN N STRANSKI INST, W-1000 BERLIN 12, GERMANY. RAMAN RES INST, BANGALORE 560080, KARNATAKA, INDIA. USN, RES LAB, CTR BIOMOLEC SCI & ENGN, WASHINGTON, DC 20375 USA. GEOCENTERS INC, FT WASHINGTON, MD 20744 USA. RP UNIV FLORIDA, DEPT CHEM, GAINESVILLE, FL 32611 USA. RI Rao, Shankar/B-1203-2009 NR 21 TC 3 Z9 3 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD NOV 15 PY 1992 VL 46 IS 10 BP R6166 EP R6169 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JZ678 UT WOS:A1992JZ67800013 ER PT J AU FELDMAN, JL BROUGHTON, JQ BOYER, LL REICH, DE KLUGE, MD AF FELDMAN, JL BROUGHTON, JQ BOYER, LL REICH, DE KLUGE, MD TI INTRAMOLECULAR-FORCE-CONSTANT MODEL FOR C-60 SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; VIBRATIONAL-MODES; LATTICE-DYNAMICS; BUCKMINSTERFULLERENE; SPECTROSCOPY; CLUSTERS; CRYSTALS; SPECTRA; DIAMOND; RAMAN AB A least-squares fit of a short-range-force-constant model to the 14 Raman and infrared active normal-mode frequencies of C60 has been obtained. The fit is better than 3.8% (in frequency) for any of these modes. The model, which has seven adjustable parameters, consists of two- and three-body valence-force-field terms and a four-body potential-energy term taken to be proportional to the square of the deviation in the volume of a tetrahedron formed by an atom and its three nearest neighbors. In its effect on the atomic vibrations, the latter term is closely related to the out-of-plane, or puckering, force-constant term proposed several years ago for graphite. The resulting parameters of the model are also quantitatively similar to those for that model of graphite. The full frequency spectrum based on the model compares reasonably well with recent inelastic neutron-scattering measurements. In addition, first-principles (local-density-approximation) calculations of the A(u)-mode frequency have recently become available; the model yields 1012 cm-1 for this mode, which is 16+/-3% higher than the first-principles result. RP FELDMAN, JL (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 35 TC 38 Z9 38 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1992 VL 46 IS 19 BP 12731 EP 12736 DI 10.1103/PhysRevB.46.12731 PG 6 WC Physics, Condensed Matter SC Physics GA JZ039 UT WOS:A1992JZ03900072 ER PT J AU QUONG, AA PEDERSON, MR AF QUONG, AA PEDERSON, MR TI DENSITY-FUNCTIONAL-BASED LINEAR AND NONLINEAR POLARIZABILITIES OF FULLERENE AND BENZENE MOLECULES SO PHYSICAL REVIEW B LA English DT Note ID 2ND-HARMONIC GENERATION; OPTICAL-RESPONSE; APPROXIMATION; SIMULATIONS; SUSCEPTIBILITY; DEPOSITION; SYSTEMS; C60 AB To address recent experiments showing a relatively large off-resonant nonlinear optical response of the fullerene molecule, we have calculated the static electronic response of fullerene molecules. While our linear polarizability is in good agreement with experimental measurements, we find that the third-order contribution is approximately one or two orders of magnitude lower than the experimental measurements. Using the same theoretical method, we have calculated the first- and third-order polarizabilities of benzene and find good agreement between our results and other experimental and theoretical results. RP QUONG, AA (reprint author), USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. NR 34 TC 70 Z9 70 U1 0 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1992 VL 46 IS 19 BP 12906 EP 12909 DI 10.1103/PhysRevB.46.12906 PG 4 WC Physics, Condensed Matter SC Physics GA JZ039 UT WOS:A1992JZ03900119 ER PT J AU SINGH, DJ KRAKAUER, H HAAS, C LIU, AY AF SINGH, DJ KRAKAUER, H HAAS, C LIU, AY TI PROJECTOR-BASIS TECHNIQUE AND CAR-PARRINELLO SCALING IN MIXED-BASIS, LINEARIZED-AUGMENTED-PLANE-WAVE, AND EXTENDED LINEARIZED-AUGMENTED-PLANE-WAVE ELECTRONIC-STRUCTURE METHODS SO PHYSICAL REVIEW B LA English DT Article ID SEMICONDUCTOR CHARGE-DENSITIES; SOFT-CORE PSEUDOPOTENTIALS; TOTAL-ENERGY CALCULATIONS; EFFICIENT PSEUDOPOTENTIALS; MOLECULAR-DYNAMICS; HARD-CORE; DIAGONALIZATION; 1ST-PRINCIPLES; INTERPOLATION; POTENTIALS AB It is shown that by exploiting auxiliary or projector-basis functions as a local representation of plane waves, highly efficient implementations of several band-structure techniques can be obtained. Examples are nonlocal pseudopotential methods with (1) plane-wave and (2) mixed (plane waves plus local orbitals) basis sets, and the all-electron (3) linearized-augmented-plane-wave and (4) extended linearized-augmented-plane-wave methods. The computation in all of the proposed techniques scales as N2ln(N), where N is the number of atoms in the unit cell. Early calculations are presented for the plane-wave and mixed-basis approaches. C1 COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012; Liu, Amy/E-2266-2015; OI Liu, Amy/0000-0002-2011-1854; Krakauer, Henry/0000-0003-2517-0957 NR 35 TC 14 Z9 14 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1992 VL 46 IS 20 BP 13065 EP 13072 DI 10.1103/PhysRevB.46.13065 PG 8 WC Physics, Condensed Matter SC Physics GA KA577 UT WOS:A1992KA57700014 ER PT J AU PEDERSON, MR QUONG, AA AF PEDERSON, MR QUONG, AA TI POLARIZABILITIES, CHARGE STATES, AND VIBRATIONAL-MODES OF ISOLATED FULLERENE MOLECULES SO PHYSICAL REVIEW B LA English DT Article ID C60; BUCKMINSTERFULLERENE; APPROXIMATION; SIMULATIONS; SYSTEMS; DEPOSITION; CLUSTERS; LATTICE; ENERGY; K3C60 AB We have used our local-orbital cluster codes to perform detailed density-functional-based calculations on isolated C60 molecules. We present first- and second-electron affinities, which include all effects due to spin polarization and charge-induced geometrical relaxation. The effects due to the generalized gradient approximation are reported as well. The two A(g) and single A(u) vibrational modes are presented and frequency shifts due to charging are estimated. By placing the fullerene molecules in a static electric field of variable strength, the molecular static polarizabilities are obtained. In comparison to isolated carbon atoms, we find enhancements in the linear polarizabilities due to the delocalized electrons at the Fermi level, but do not observe any large nonlinear static contributions. By including effects due to charge transfer, on-site geometric relaxation, and fullerene polarization, we introduce a simple potential that accounts for long-range interactions and predict Hubbard parameters as a function of alkali-dopant concentration. RP PEDERSON, MR (reprint author), USN, RES LAB, COMPLEX SYST THEORY BRANCH 4692, WASHINGTON, DC 20375 USA. NR 38 TC 138 Z9 138 U1 1 U2 13 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1992 VL 46 IS 20 BP 13584 EP 13591 DI 10.1103/PhysRevB.46.13584 PG 8 WC Physics, Condensed Matter SC Physics GA KA577 UT WOS:A1992KA57700076 ER PT J AU DUNLAP, BI HABERLEN, OD ROSCH, N AF DUNLAP, BI HABERLEN, OD ROSCH, N TI ASYMMETRIC LOCALIZATION OF TITANIUM IN C-28 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID SPHEROIDAL CARBON SHELLS; X-ALPHA; COMPLEXES; CLUSTERS; ATOMS; C-60; GAS AB Linear combination of Gaussian-type orbital (LCGTO) local density functional (LDF) calculations on the Ti@C28 endohedral fullerene complex suggest that the titanium atom is too small to fill completely the interior volume of the tetrahedral C28 fullerene and the titanium atom is attracted a significant distance, 0.5 angstrom, toward one of the four corners of the tetrahedron. This may be one reason why Ti@C28 is experimentally less abundant and stable than U@C28, which has a larger endohedral atom. C1 TECH UNIV MUNICH,LEHRSTUHL THEORET CHEM,W-8046 GARCHING,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. RI Roesch, Notker/C-1182-2010; OI Dunlap, Brett/0000-0003-1356-6559 NR 32 TC 48 Z9 49 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 12 PY 1992 VL 96 IS 23 BP 9095 EP 9097 DI 10.1021/j100202a003 PG 3 WC Chemistry, Physical SC Chemistry GA JX921 UT WOS:A1992JX92100003 ER PT J AU PHILLIPS, JA CLEGG, AW AF PHILLIPS, JA CLEGG, AW TI ELECTRON-DENSITY FLUCTUATIONS IN THE LOCAL INTERSTELLAR BUBBLE SO NATURE LA English DT Article ID SCINTILLATIONS; TURBULENCE AB THE interstellar medium in our vicinity forms an elongated cavity of X-ray-emitting gas, extending up to 200 pc from the Sun1,2. The gas inside this local bubble is very hot (approximately 10(6) K) and tenuous (electron density n(e) almost-equal-to 0.005 cm-3), and is typical of material in the coronal phase of the interstellar medium, thought to occur when hot stars or supernovae blow out holes in cooler and denser interstellar gas. Little is known about turbulent density fluctuations in the coronal gas, but its physical state is important in understanding cosmic ray confinement and the energy balance of interstellar material, as well as the scattering of radio emission from compact sources3,4. To probe turbulence in the local interstellar medium, we have made scintillation measurements at 50 MHz (6 m wavelength) of emission from the nearby pulsar 0950+08, which happens to lie near the edge of the local bubble. From the scintillation bandwidth we deduce the amplitude of the electron-density fluctuation spectrum in the coronal gas alone, and find it to be an order of magnitude lower than for any previously measured interstellar line of sight. We conclude that the interior of the bubble is relatively quiescent and that high levels of plasma turbulence-if they exist-must be localized to the cavity boundary. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PHILLIPS, JA (reprint author), CALTECH,OWENS VALLEY RADIO OBSERV,105-24,PASADENA,CA 91125, USA. NR 21 TC 39 Z9 40 U1 0 U2 3 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD NOV 12 PY 1992 VL 360 IS 6400 BP 137 EP 139 DI 10.1038/360137a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JX752 UT WOS:A1992JX75200051 ER PT J AU KIM, J KAYE, FJ HENSLEE, JG SHIVELY, JE PARK, JG LAI, SL LINNOILA, RI MULSHINE, JL GAZDAR, AF AF KIM, J KAYE, FJ HENSLEE, JG SHIVELY, JE PARK, JG LAI, SL LINNOILA, RI MULSHINE, JL GAZDAR, AF TI EXPRESSION OF CARCINOEMBRYONIC ANTIGEN AND RELATED GENES IN LUNG AND GASTROINTESTINAL CANCERS SO INTERNATIONAL JOURNAL OF CANCER LA English DT Article ID CROSS-REACTING ANTIGEN; IMMUNOGLOBULIN SUPERGENE FAMILY; NEURON-SPECIFIC ENOLASE; BILIARY GLYCOPROTEIN-I; CELL-LINES; MONOCLONAL-ANTIBODY; ADHESION MOLECULE; CEA; LOCALIZATION; IDENTIFICATION AB Carcinoembryonic antigen (CEA), a tumor marker for lung cancers of small cell (SCLC) and non-small cell (NSCLC) types, belongs in a multigene family which includes non-specific cross-reacting antigen (NCA) and biliary glycoprotein I (BGP). We used specific cDNA probes and a CEA immunoassay to determine the pattern of expression in normal and malignant lung and gastrointestinal (GI) tissues. Normal lung contained high amounts of NCA and a low concentration of CEA. All 3 genes were expressed discordantly in lung tumors and cell lines. In contrast, all three genes were expressed in most GI tumor cell lines. In both lung and colorectal cell lines expression of NCA RNA was relatively high, while BGP RNA was relatively low, and the median concentrations of CEA were greater than in corresponding non-malignant tissues. While CEA protein concentrations in lung cell lines were similar to those present in GI cell lines, the ratio of NCA:CEA RNA was significantly higher in lung cancer lines than in colorectal lines. Thus, NCA constitutes most of the "CEA-like" immunoreactivity previously described in lung cancers. There was excellent concordance between expression of CEA RNA and CEA protein, as well as between concentrations of CEA protein in cell line pellets and supernatant fluids. Of interest, significantly higher rates of CEA expression were present in lung cancers expressing neuroendocrine (NE) markers. The association between CEA expression and NE cell properties is intriguing and may prove to be of clinical interest. C1 UNIV TEXAS,SW MED CTR,SIMMONS CANC CTR,DALLAS,TX 75235. UNIV TEXAS,SW MED CTR,DEPT PATHOL,DALLAS,TX 75235. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. USN HOSP,BETHESDA,MD 20814. CITY HOPE NATL MED CTR,BECKMAN RES INT,BECKMAN RES INST,DIV IMMUNOL,DUARTE,CA 91010. SEOUL NATL UNIV & HOSP,COLL MED,DEPT SURG,SEOUL 110,SOUTH KOREA. RI kaye, frederic/E-2437-2011; Park, Jae-Gahb/J-5494-2012 NR 30 TC 40 Z9 41 U1 0 U2 2 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7136 J9 INT J CANCER JI Int. J. Cancer PD NOV 11 PY 1992 VL 52 IS 5 BP 718 EP 725 DI 10.1002/ijc.2910520509 PG 8 WC Oncology SC Oncology GA JX961 UT WOS:A1992JX96100008 PM 1330929 ER PT J AU WEILER, KW VANDYK, SD PRINGLE, JE PANAGIA, N AF WEILER, KW VANDYK, SD PRINGLE, JE PANAGIA, N TI EVIDENCE FOR PERIODIC MODULATION OF PRESUPERNOVA MASS-LOSS FROM THE PROGENITOR OF SN 1979C SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; STARS, MASS LOSS; SUPERNOVAE, INDIVIDUAL (SN 1979C) ID RADIO-EMISSION; SUPER-NOVAE; TIME-SERIES; EVOLUTION; STARS; MODELS; WIND AB Examination of the short-term deviations from the best-fit model light curves for 10 years of measurements on the radio supernova SN 1979C at 20 and 6 cm shows periodic behavior. With an observed period of approximately 1575 days, model interpretations imply an approximately 8% modulation of the presupernova stellar wind density on a time scale of approximately 4000 yr. These observations therefore provide the first direct evidence for the periodic modulation of stellar winds on long time scales. Although any interpretations remain tentative at this point, the mechanism may involve modulation of the mass loss in a stellar wind from the presupernova red supergiant either as a result of pulsational instability or, more likely, by interaction with a massive companion star in a highly eccentric binary orbit, similar to the conditions in the VV Cephei star systems. C1 SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. UNIV CATANIA,I-95124 CATANIA,ITALY. RP WEILER, KW (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4215,WASHINGTON,DC 20375, USA. NR 25 TC 49 Z9 49 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 10 PY 1992 VL 399 IS 2 BP 672 EP 679 DI 10.1086/171959 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JV806 UT WOS:A1992JV80600030 ER PT J AU EMSLIE, AG LI, P MARISKA, JT AF EMSLIE, AG LI, P MARISKA, JT TI DIAGNOSTICS OF ELECTRON-HEATED SOLAR-FLARE MODELS .3. EFFECTS OF TAPERED LOOP GEOMETRY AND PREHEATING SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD; METHODS, NUMERICAL; SUN, CORONA; SUN, FLARES ID IMPULSIVE PHASE; NONTHERMAL ELECTRONS; TRANSITION REGION; LINE AB We present a series of hydrodynamic numerical simulations of nonthermal electron-heated solar flare atmospheres and their corresponding soft X-ray Ca xix emission-line profiles, under the conditions of tapered flare loop geometry and/or a preheated atmosphere. The degree of tapering is parameterized by the magnetic mirror ratio, while the preheated atmosphere is parameterized by the initial upper chromospheric pressure. In a tapered flare loop, it is found that the upward motion of evaporated material is faster compared with the case where the flare loop is uniform. This is due to the diverging nozzle seen by the upflowing material. Under the condition of low initial upper chromosphere pressure and large magnetic mirror ratio, supersonic hydrodynamic flows may be formed in the corona at the flare peak. The centroids of the Ca XIX line profiles produced by the flare atmosphere in such a scenario are significantly blueshifted (by approximately 4 mangstrom), and are therefore not consistent with the published Bent Crystal Spectrometer (BCS) observations. In the case where the flare atmosphere is preheated and the flare geometry is uniform, the response of the atmosphere to the electron collisional heating is slow. The upward velocity of the hydrodynamic gas is reduced due not only to the large coronal column depth (which reduces the amount of energy reaching the chromosphere), but also to the increased inertia of the overlying material (which reduces its hydrodynamic effects). When the preflare atmosphere is heated such that the initial coronal atmospheric density is in excess of 6 x 10(10) cm-3, the upward velocity throughout the entire loop is less than 100 km s-1. The resulting Ca XIX line profile has a blueshift less than 1 mA and therefore is consistent with the BCS observations. We conclude that the only possible electron-heated scenario in which the predicted Ca XIX line profiles agree with the BCS observations is when the impulsive flare starts in a preheated dense corona. C1 UNIV ALABAMA,DEPT PHYS,HUNTSVILLE,AL 35899. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NR 16 TC 46 Z9 48 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 10 PY 1992 VL 399 IS 2 BP 714 EP 723 DI 10.1086/171964 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JV806 UT WOS:A1992JV80600035 ER PT J AU CLAYTON, DD LEISING, MD THE, LS JOHNSON, WN KURFESS, JD AF CLAYTON, DD LEISING, MD THE, LS JOHNSON, WN KURFESS, JD TI THE CO-57 ABUNDANCE IN SN-1987A SO ASTROPHYSICAL JOURNAL LA English DT Article DE ABUNDANCES; NUCLEOSYNTHESIS; SUPERNOVAE, INDIVIDUAL (SN-1987A) ID EXPLOSIVE NUCLEOSYNTHESIS; LIGHT-CURVE; SN 1987A; SUPERNOVAE; RAY AB We discuss several astrophysical consequences of the detection by OSSE (Kurfess et al. 1992) of Co-57 gamma radiation from supernova 1987A. Models with low photoelectric absorption cannot account for both OSSE data and the bolometric luminosity. By burying the alpha-rich-freezeout portion at deeper gamma depths than in published models, we show that it remains barely possible that the bolometric luminosity during days 1200-1800 could derive from Co-57 power without requiring 57/56 production ratios greater than twice solar. We illustrate this by slowing the expansion within the inner four solar masses of ejecta in model 10HMM. A successful fit to both total radiated power and to OSSE Co-57 flux can be attained. However, that "slow core" model may then be too opaque near day 500-700 to allow for the suggested decline of the bolometric light curve below exponential during that earlier period. We also propose alternative mechanisms which may contribute to the bolometric power at late times: (1) stored power owing to delayed emission of thermalized gamma-ray energy. Mechanisms include (a) delayed release of chemical power owing to decreasing ionization, for which we present a simple analytic theory; or, (b) increasing time delay for suprathermal electrons to strike dust grains; (2) dissipation at rate 10(-13) s-1 of mechanical energy owing to collisions within the ejecta. Because of the importance of Fe isotopic ratios to chemical evolution of the Galaxy, we outline the resulting chemical evolution problem for the solar Fe-57 abundance. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP CLAYTON, DD (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634, USA. RI Johnson, Neil/G-3309-2014 NR 27 TC 45 Z9 45 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 10 PY 1992 VL 399 IS 2 BP L141 EP L144 DI 10.1086/186627 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JV811 UT WOS:A1992JV81100009 ER PT J AU KURFESS, JD JOHNSON, WN KINZER, RL KROEGER, RA STRICKMAN, MS GROVE, JE LEISING, MD CLAYTON, DD GRABELSKY, DA PURCELL, WR ULMER, MP CAMERON, RA JUNG, GV AF KURFESS, JD JOHNSON, WN KINZER, RL KROEGER, RA STRICKMAN, MS GROVE, JE LEISING, MD CLAYTON, DD GRABELSKY, DA PURCELL, WR ULMER, MP CAMERON, RA JUNG, GV TI ORIENTED SCINTILLATION SPECTROMETER EXPERIMENT OBSERVATIONS OF CO-57 IN SN-1987A SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, OBSERVATIONS; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; SUPERNOVAE, INDIVIDUAL (SN-1987A); X-RAYS, GENERAL ID 1987A AB The Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma Ray Observatory has observed SN 1987A for two 2 week periods during the first 9 months of the mission. Evidence for gamma-ray line and continuum emission from Co-57 is observed with an intensity of about 10(-4) gamma cm-2 s-1. This photon flux between 50 and 136 keV is demonstrated by Monte Carlo calculations to be independent of the radial distribution of Co-57 for models of low optical depth, viz., models having photoelectric absorption losses of 122 keV photons no greater than several percent. For such models the observed Co-57 flux indicates that the ratio Ni-57/Ni-56 produced in the explosion was about 1.5 times the solar system ratio of Fe-57/Fe-56. When compared with nearly contemporaneous bolometric estimates of the luminosity for SN 1987A, our observations imply that Co-57 radioactivity does not account for most of the current luminosity of the supernova remnant in low optical depth models. We suggest alternatives, including a large optical depth model that is able to provide the SN 1987A luminosity and is consistent with the OSSE flux. It requires a 57/56 production ratio about twice solar. C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60201. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. RP KURFESS, JD (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. RI Johnson, Neil/G-3309-2014 NR 20 TC 92 Z9 92 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 10 PY 1992 VL 399 IS 2 BP L137 EP L140 DI 10.1086/186626 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JV811 UT WOS:A1992JV81100008 ER PT J AU MCLEOD, MG AF MCLEOD, MG TI SIGNALS AND NOISE IN MAGNETIC OBSERVATORY ANNUAL MEANS - MANTLE CONDUCTIVITY AND JERKS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID 1970 GEOMAGNETIC JERK; SECULAR VARIATION; FIELD; COMPONENTS; INVERSION; IMPULSES AB Geomagnetic temporal variations can yield valuable information on the electrical conductivity of Earth's mantle and on motion of core fluid. The external-source signal in first differences of magnetic observatory annual means is primarily due to a degree-one spherical harmonic closely aligned with Earth's magnetic dipole axis. The transfer function between the electromagnetically induced degree-one internal Gauss coefficient (Schmidt seminormalized) and the inducing degree-one external Gauss coefficient is 0.089 +/- 0.020 with a phase shift of 0-degrees +/- 45-degrees for a 2-year period. This transfer function is consistent with a nearly insulating mantle and a highly conducting core for which the theoretical transfer function is 0.082 with no phase shift. The temporal power spectrum for noise in first differences of magnetic observatory annual means is approximately white. Third differences of annual means are primarily noise and degree-one external-source signal; thus, when the degree-one external-source signal is removed from annual means third differences, the root-mean-square residuals for a given field component and time interval at a given observatory are a good indicator of noise for the relevant component, observatory, and time interval. These rms residuals were used as weights for construction of spherical harmonic models of geomagnetic secular variation. European secular variation graphs for the 1962-1983 time interval exhibit prominent changes of slope (geomagnetic jerks) in the geomagnetic east component at approximately 1970 and 1978. The jerk of 1970 (but not 1978) is evident on the geomagnetic north and vertical components. The vertical component exhibits additional slope changes at approximately 1966 and 1975. RP MCLEOD, MG (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 30 TC 23 Z9 23 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-SOL EA JI J. Geophys. Res.-Solid Earth PD NOV 10 PY 1992 VL 97 IS B12 BP 17261 EP 17290 DI 10.1029/92JB01847 PG 30 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA JY189 UT WOS:A1992JY18900004 ER PT J AU PARK, K SALAMANCARIBA, L JONKER, BT AF PARK, K SALAMANCARIBA, L JONKER, BT TI CHEMICAL ORDERING IN ZN1-XFEXSE ALLOYS SO APPLIED PHYSICS LETTERS LA English DT Article ID LONG-RANGE ORDER; EPITAXIAL-GROWTH; PHASE EPITAXY AB We have observed chemical ordering in Zn1-xFexSe (x almost-equal-to 0.5) epilayers as well as in nominal (ZnSe/FeSe) superlattices along the [001] growth direction and the [110] direction using transmission electron microscopy. The ordered structure consists of alternating ZnSe and FeSe layers along the [001] and [110] directions. In nominal (ZnSe/FeSe) superlattices grown on (001) GaAs substrates, strain-induced interdiffusion between the layers takes place followed by ordering of the resultant Zn1-xFexSe alloys. Computer simulated images for a Zn0.5Fe0.5Se compound were obtained and compared with experimental images. To our knowledge, this is the first observation of ordering in a II-VI alloy. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PARK, K (reprint author), UNIV MARYLAND,DEPT MAT & NUCL ENGN,COLL PK,MD 20742, USA. RI Salamanca-Riba, Lourdes/B-3785-2009 OI Salamanca-Riba, Lourdes/0000-0001-8155-6403 NR 19 TC 25 Z9 25 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 9 PY 1992 VL 61 IS 19 BP 2302 EP 2304 DI 10.1063/1.108271 PG 3 WC Physics, Applied SC Physics GA JW880 UT WOS:A1992JW88000016 ER PT J AU SHANABROOK, BV WATERMAN, JR DAVIS, JL WAGNER, RJ AF SHANABROOK, BV WATERMAN, JR DAVIS, JL WAGNER, RJ TI LARGE TEMPERATURE-CHANGES INDUCED BY MOLECULAR-BEAM EPITAXIAL-GROWTH ON RADIATIVELY HEATED SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article AB We have performed optical transmission measurements on radiatively heated GaAs substrates as a function of molecular beam epitaxial growth of InAs, GaSb, AlSb, and GaAs films. The energy gap of the GaAs substrate is observed to decrease strongly in energy when materials with band gaps smaller than GaAs are deposited. This decrease in energy gap is a consequence of a substantial increase in growth temperature induced by the deposition of the film. We have observed increases in temperature of over 150-degrees-C from the temperature measured before film growth. Because the thermocouple is weakly coupled to the radiatively heated substrate, conventional temperature controllers are ineffective at measuring or accounting for this change in temperature. RP SHANABROOK, BV (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 44 Z9 44 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 9 PY 1992 VL 61 IS 19 BP 2338 EP 2340 DI 10.1063/1.108236 PG 3 WC Physics, Applied SC Physics GA JW880 UT WOS:A1992JW88000028 ER PT J AU SAAVEDRA, JE DUNAMS, TM FLIPPENANDERSON, JL KEEFER, LK AF SAAVEDRA, JE DUNAMS, TM FLIPPENANDERSON, JL KEEFER, LK TI SECONDARY AMINE NITRIC-OXIDE COMPLEX-IONS, R2N[N(O)NO]- - O-FUNCTIONALIZATION CHEMISTRY SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article AB Alkylation of the R2N[N(O)NO]- anion has been studied with the aim of extending the reaction's scope, probing its stereochemistry, and exploring the reactivity of its variously functionalized products. Using the sodium salt of the R = Et ion (1) as the standard starting material, numerous novel products having the structure Et2N[N2O2]R]' (2) were isolated from its reaction with alkyl halides, sulfate esters, and oxiranes. In addition to previously described examples in which R' is a simple straight-chain alkyl or benzyl group, new compound types in which R' is hydroxylated, halide-containing, alpha-methoxylated, and olefinic were prepared. The 2-bromoethyl derivative could be dehydrohalogenated to the O-vinyl compound or further reacted with other nucleophiles such as amines, water, or a second mole of 1 to produce additional new compound types. Ethylation of 1 appeared to occur exclusively at the terminal oxygen to give Et2NN(O)=NOEt as the only isomer detected; this conclusion regarding the regiochemistry of the reaction conflicts with that found in the previous literature, but its generality was supported by X-ray crystallographic analysis of the Et2NN(O)=NOCH2CH2(NC5H5)+Br- analogue. Hydrolytic decomposition of 2 was slow, even for the O-vinyl and -methoxymethyl derivatives, as reflected in the sluggish loss of the intense chromophore these compounds characteristically show at 225-245 nm (epsilon (6.5-9) x 10(3) M-1 cm-1); half-lives at 37-degrees-C for the latter two compounds were 12 h in 0.1 M HCl and 9 h in 1 M HCl respectively. N-Nitrosodiethylamine was a frequent byproduct of both the synthesis and hydrolysis of 2. The results should aid the effort to design prodrug derivatives of 1, a compound type which has recently been shown to exhibit useful pharmacological effects. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP SAAVEDRA, JE (reprint author), NCI,FREDERICK CANC RES & DEV CTR,CHEM SECT,COMPARAT CARCINOGENESIS LAB,FREDERICK,MD 21702, USA. RI Keefer, Larry/N-3247-2014 OI Keefer, Larry/0000-0001-7489-9555 NR 20 TC 83 Z9 84 U1 2 U2 7 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 NOV 6 PY 1992 VL 57 IS 23 BP 6134 EP 6138 DI 10.1021/jo00049a017 PG 5 WC Chemistry, Organic SC Chemistry GA JX822 UT WOS:A1992JX82200017 ER PT J AU PACE, PE RAMAMOORTHY, PA STYER, D AF PACE, PE RAMAMOORTHY, PA STYER, D TI HIGH-RESOLUTION TECHNIQUE FOR GUIDED-WAVE ANALOG-DIGITAL CONVERTERS SO ELECTRONICS LETTERS LA English DT Article DE INTEGRATED OPTICS; HIGH-RESOLUTION ANALOG-DIGITAL CONVERSION; ELECTROOPTICS AB A technique is described for extending the resolution of multi-interferometer, guided-wave A/D convertors. Impressing a symmetrical number system (SNS) on the architecture, the optical output waveform for each interferometer is symmetrically folded at a proper modulus. A small comparator ladder mid-level quantises each interferometer output to encode the analogue signal in an SNS format providing resolution greater than 1 bit/interferometer. C1 UNIV CINCINNATI,ECE DEPT,CINCINNATI,OH 45221. UNIV CINCINNATI,DEPT MATH,CINCINNATI,OH 45221. RP PACE, PE (reprint author), USN,POSTGRAD SCH,ECE DEPT,MONTEREY,CA 93943, USA. NR 3 TC 1 Z9 1 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 5 PY 1992 VL 28 IS 23 BP 2174 EP 2175 DI 10.1049/el:19921395 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA JY823 UT WOS:A1992JY82300041 ER PT J AU GUARD, HE COLEMAN, WM ROSS, MM AF GUARD, HE COLEMAN, WM ROSS, MM TI ON THE CHARACTERIZATION OF THE REACTION OF ORGANOTIN COMPOUNDS WITH D-GLUCURONIC ACID SO CARBOHYDRATE RESEARCH LA English DT Article ID URONIC-ACIDS; METAL-IONS; C-13 NMR; RESONANCE; CATIONS AB C-13 NMR spectroscopy and mass spectrometry show that D-glucuronic acid forms trialkyltin glucuronate complexes upon reaction with bis(tributyltin) oxide but not with tributyltin or trimethyltin chlorides in Me2SO or the trimethyltin chloride in water. Analysis of the C-13 NMR chemical shifts of the tributyltin D-glucuronate formed indicates that appreciable interaction of the d-orbitals on tin occurs with primarily the O-4 hydroxyl group and to a lesser extent with ring oxygen at C-1. Previous incorrect assignments of the C-13 NMR signals for D-glucuronic acid are discussed. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP GUARD, HE (reprint author), OFF NAVAL RES,DIV CHEM,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 17 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0008-6215 J9 CARBOHYD RES JI Carbohydr. Res. PD NOV 4 PY 1992 VL 235 BP 41 EP 51 DI 10.1016/0008-6215(92)80077-E PG 11 WC Biochemistry & Molecular Biology; Chemistry, Applied; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA KA067 UT WOS:A1992KA06700005 ER PT J AU GODBEY, DJ ANCONA, MG AF GODBEY, DJ ANCONA, MG TI GE PROFILE FROM THE GROWTH OF SIGE BURIED LAYERS BY MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID SURFACE SEGREGATION; SI1-XGEX ALLOYS; ETCH STOP; PHOTOLUMINESCENCE; SILICON AB X-ray photoelectron spectroscopy measurements were obtained and interpreted by a kinetic simulation to determine the germanium concentration profile of thin Si/SiGe heterostructures grown at 500-degrees-C using elemental source molecular beam epitaxy. The primary finding is that there are significant segregation effects in these commonly grown structures which affect both the "leading" and "trailing" interfaces. Upon opening of the germanium shutter, the surface monolayer must be built up to a germanium composition of greater than 96% before the composition of the deposited alloy layer is equal to the flux composition for a Ge ratio of 0.3. This buildup causes the germanium depletion at the leading interface. Upon termination of the germanium flux, the incorporation of the germanium rich monolayer into the growing silicon cap layer causes a corresponding degradation of the trailing interface. RP GODBEY, DJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 41 Z9 41 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 2 PY 1992 VL 61 IS 18 BP 2217 EP 2219 DI 10.1063/1.108272 PG 3 WC Physics, Applied SC Physics GA JW461 UT WOS:A1992JW46100031 ER PT J AU TOVEY, CA AF TOVEY, CA TI A POLYNOMIAL-TIME ALGORITHM FOR COMPUTING THE YOLK IN FIXED DIMENSION SO MATHEMATICAL PROGRAMMING LA English DT Article ID SPATIAL VOTING GAMES; MAJORITY-RULE; POWER; SET; TOURNAMENTS; MODELS; SIZE AB The yolk, developed in Ferejohn, McKelvey and Packel (1984) and McKelvey (1986), is a key solution concept in the Euclidean spatial model as the region of policies where a dynamic voting game will tend to reside. However, determining the yolk is NP-hard for arbitrary dimension. This paper derives an algorithm to compute the yolk in polynomial time for any fixed dimension. C1 USN,POSTGRAD SCH,COLL COMP,DEPT OPERAT RES,MONTEREY,CA 93940. RP TOVEY, CA (reprint author), GEORGIA INST TECHNOL,ATLANTA,GA 30332, USA. NR 39 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0025-5610 J9 MATH PROGRAM JI Math. Program. PD NOV 2 PY 1992 VL 57 IS 2 BP 259 EP 277 DI 10.1007/BF01581084 PG 19 WC Computer Science, Software Engineering; Operations Research & Management Science; Mathematics, Applied SC Computer Science; Operations Research & Management Science; Mathematics GA KE278 UT WOS:A1992KE27800008 ER PT J AU PEDERSON, MR BROUGHTON, JQ AF PEDERSON, MR BROUGHTON, JQ TI NANOCAPILLARITY IN FULLERENE TUBULES SO PHYSICAL REVIEW LETTERS LA English DT Article ID APPROXIMATION; SIMULATIONS; ACCURATE AB Fullerene tubules are shown to be highly polarizable "molecular straws" capable of ingesting dipolar molecules. Local-density-functional calculations on HF molecules within a finite-length tubule, of size 144 atoms, demonstrate this effect. The energy of incarceration is several times the thermal ambient at room temperature. These calculations, now feasible on desktop workstations, open the way to the study of nanoscale capillarity and to, perhaps, precise control over shielding of specific "guest" compounds from external electric and magnetic fields. RP PEDERSON, MR (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 17 TC 283 Z9 298 U1 1 U2 36 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 2 PY 1992 VL 69 IS 18 BP 2689 EP 2692 DI 10.1103/PhysRevLett.69.2689 PG 4 WC Physics, Multidisciplinary SC Physics GA JV897 UT WOS:A1992JV89700023 ER PT J AU HOBSON, GV LAKSHMINARAYANA, B AF HOBSON, GV LAKSHMINARAYANA, B TI FULLY ELLIPTIC INCOMPRESSIBLE-FLOW CALCULATIONS ON REGULAR GRID SO AIAA JOURNAL LA English DT Note C1 PENN STATE UNIV,DEPT AEROSP ENGN,UNIV PK,PA 16802. RP HOBSON, GV (reprint author), NAVAL POST GRAD SCH,MONTEREY,CA 93943, USA. NR 6 TC 0 Z9 0 U1 1 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 NOV PY 1992 VL 30 IS 11 BP 2783 EP 2785 DI 10.2514/3.11301 PG 3 WC Engineering, Aerospace SC Engineering GA JV780 UT WOS:A1992JV78000031 ER PT J AU MCCURDY, CM MAGANN, EF MCCURDY, CJ SALTZMAN, AK AF MCCURDY, CM MAGANN, EF MCCURDY, CJ SALTZMAN, AK TI THE EFFECT OF PLACENTAL MANAGEMENT AT CESAREAN DELIVERY ON OPERATIVE BLOOD-LOSS SO AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY LA English DT Article DE CESAREAN DELIVERY; PLACENTA; BLOOD LOSS ID ANTIBIOTIC-THERAPY; ENDOMYOMETRITIS AB OBJECTIVES: The effect of alternative methods of placental delivery at cesarean section on blood loss has not been reported. The hypothesis of this study was that spontaneous expulsion of the placenta would reduce operative blood loss, compared with that of manual extraction during cesarean delivery. STUDY DESIGN: We prospectively randomized and compared outcomes of 62 gravid women with manual (n = 31) or spontaneous (n = 31) placental delivery at cesarean section. Operative blood loss was measured directly. RESULTS: Blood loss measured at cesarean delivery was greater in the manually delivered group (967 +/- 248 ml) than in the spontaneously delivered group (666 +/- 271 ml, p < 0.0001). The incidence of postpartum endometritis was sevenfold greater in the manual than the spontaneous group (23% vs 3%, respectively; p < 0.05). CONCLUSIONS: We conclude that spontaneous expulsion of the placenta at cesarean delivery results in less operative blood loss and a lower incidence of postoperative endometritis. C1 USN HOSP,DEPT OBSTET & GYNECOL,CAMP LEJEUNE,NC. NR 14 TC 37 Z9 37 U1 0 U2 1 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0002-9378 J9 AM J OBSTET GYNECOL JI Am. J. Obstet. Gynecol. PD NOV PY 1992 VL 167 IS 5 BP 1363 EP 1367 PG 5 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA JZ241 UT WOS:A1992JZ24100029 PM 1442991 ER PT J AU MCKENNA, TM AF MCKENNA, TM TI RECOVERY OF VASCULAR TISSUE CONTRACTILE FUNCTION DURING SUSTAINED ENDOTOXIN EXPOSURE SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Note DE LIPOPOLYSACCHARIDE; SEPSIS; ENDOTOXEMIA; RAT ID SMOOTH-MUSCLE; CELLS; NOREPINEPHRINE AB Rat aortic rings incubated in vitro with endotoxin (10 ng/ml, 24 h) exhibited marked suppressions of sensitivity and maximum contraction to norepinephrine as well as a significant increase in guanosine 3',5'-cyclic monophosphate (cGMP) levels. Increasing the incubation time to 42 h did not result in greater suppression; instead, these rings showed improved contractile performance and control-level cGMP. Rings incubated with endotoxin for 18 h and then allowed to recuperate in control medium for another 24 h exhibited normal maximal contractions and cGMP levels; however, these rings remained less sensitive to norepinephrine. An endotoxin-neutralizing protein (50 ng/ml) shielded rings from endotoxin-induced contractile suppression if present during incubation but was unable to restore tissue sensitivity to normal levels if present during the 24-h recuperation. These findings show that vascular tissue exposed to endotoxin has a varied and time-dependent ability to counter the effects of endotoxin on contractile function and intracellular cGMP. RP MCKENNA, TM (reprint author), USN,MED RES INST,SEPT SHOCK RES PROGRAM,M242,BETHESDA,MD 20889, USA. NR 16 TC 12 Z9 12 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD NOV PY 1992 VL 263 IS 5 BP H1628 EP H1631 PN 2 PG 4 WC Physiology SC Physiology GA JZ779 UT WOS:A1992JZ77900040 ER PT J AU KIMURATAKEUCHI, M MAJDE, JA TOTH, LA KRUEGER, JM AF KIMURATAKEUCHI, M MAJDE, JA TOTH, LA KRUEGER, JM TI INFLUENZA VIRUS-INDUCED CHANGES IN RABBIT SLEEP AND ACUTE PHASE RESPONSES SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Article DE FEVER; INTERFERON; TOLERANCE; CERULOPLASMIN ID TUMOR-NECROSIS-FACTOR; SLOW-WAVE SLEEP; HOST DEFENSE; INTERFERON; INTERLEUKIN-1; FEVER; NEURAMINIDASE; INFECTION; ANIMALS; RATS AB Systematic investigations of sleep after viral inoculation have not previously been described. In the present study, rabbits were inoculated intravenously (iv) with control allantoic fluid followed by two sequential inoculations of influenza virus at intervals of 24 h. After each iv inoculation, sleep and brain temperature (T(br)), as well as leukocyte distributions and serum levels of antiviral activity and ceruloplasmin, were monitored. The first viral inoculation elicited several acute phase responses, including increased non-rapid-eye-movement sleep (NREMS), T(br), serum antiviral activity, and serum ceruloplasmin levels, as well as neutrophilia and lymphopenia. In contrast to the effects of the first inoculation, after the second inoculation of virus, all these acute phase parameters were diminished or absent (the hyporesponsive state). Inoculation of naive rabbits with heat-inactivated virus was similarly ineffective; however, inoculation of this group of rabbits with viable virus 24 h later did induce full-scale acute phase responses. The possible role of cytokines in mediating the acute phase response after influenza viral challenge is discussed. Results support the hypothesis that sleep is a facet of the acute phase response involved in host defense mechanisms. C1 UNIV TENNESSEE CTR HLTH SCI,DEPT PHYSIOL & BIOPHYS,894 UNION AVE,MEMPHIS,TN 38163. UNIV TENNESSEE CTR HLTH SCI,DEPT COMPARAT MED,MEMPHIS,TN 38163. TOKYO MED & DENT UNIV,INST MED & DENT ENGN,TOKYO 101,JAPAN. USN,OFF RES,ARLINGTON,VA 22217. NR 39 TC 33 Z9 34 U1 0 U2 2 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD NOV PY 1992 VL 263 IS 5 BP R1115 EP R1121 PN 2 PG 7 WC Physiology SC Physiology GA JZ779 UT WOS:A1992JZ77900062 ER PT J AU SHOEMAKER, PA HUTCHENS, CG PATIL, SB AF SHOEMAKER, PA HUTCHENS, CG PATIL, SB TI A HIERARCHICAL-CLUSTERING NETWORK BASED ON A MODEL OF OLFACTORY PROCESSING SO ANALOG INTEGRATED CIRCUITS AND SIGNAL PROCESSING LA English DT Article ID NEURAL NETWORKS; SYNAPSES; SYSTEMS; MEMORY AB We describe a direct analog implementation of a neural network model of olfactory processing [44-48]. This model has been shown capable of performing hierarchical clustering as a result of a coactivity-based unsupervised learning rule which is modeled after long-term synaptic potentiation. Network function is statistically based and does not require highly precise weights or other components. We present current-mode circuit designs to implement the required functions in CMOS integrated circuitry, and propose the use of floating-gate MOS transistors for modifiable, nonvolatile interconnection weights. Methods for arrangement of these weights into a sparse pseudo-random interconnection matrix, and for parallel implementation of the learning rule, are described. Test results from functional blocks on first silicon are presented. It is estimated that a network with upwards of 50K weights and with submicrosecond settling times could be built with a conventional CMOS double-poly process and die size. C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,RDT&E DIV,SAN DIEGO,CA 92152. OKLAHOMA STATE UNIV,DEPT ELECT & COMP ENGN,STILLWATER,OK 74078. RI Hutchens, Chriswell/F-1472-2016 NR 52 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 0925-1030 J9 ANALOG INTEGR CIRC S JI Analog Integr. Circuits Process. PD NOV PY 1992 VL 2 IS 4 BP 297 EP 311 PG 15 WC Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JY415 UT WOS:A1992JY41500005 ER PT J AU BOWLER, WA WEISS, PJ HILL, HE HOFFMEISTER, KA FLECK, RP BLACKY, AR OLDFIELD, EC AF BOWLER, WA WEISS, PJ HILL, HE HOFFMEISTER, KA FLECK, RP BLACKY, AR OLDFIELD, EC TI RISK OF VENTRICULAR DYSRHYTHMIAS DURING 1-HOUR INFUSIONS OF AMPHOTERICIN-B IN PATIENTS WITH PRESERVED RENAL-FUNCTION SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Note AB In order to assess the safety of 1-h infusions of amphotericin B (AMB), we prospectively monitored 213 1-h infusions of AMB (dose range, 0.27 to 0.89 mg/kg of body weight) in 27 patients with creatinine clearances of >25 ml/min. Holter monitor tracings during 1-h infusions were compared with those during a 4-h baseline period of monitoring. There were no ventricular dysrhythmias during 1-h infusions of AMB that were not present during baseline monitoring. Nausea and/or rigors were noted for 32 (15%) infusions in six (22%) patients. No patient exhibited a temperature rise of > 1-degrees-C. We conclude that, in doses of up to 0.9 mg/kg, AMB does not appear to induce asymptomatic ventricular dysrhythmias when administered over 1 h to patients with creatinine clearances of >25 ml/min. C1 USN HOSP,DEPT INTERNAL MED,DIV CARDIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. NR 9 TC 11 Z9 11 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD NOV PY 1992 VL 36 IS 11 BP 2542 EP 2543 PG 2 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA JW463 UT WOS:A1992JW46300038 PM 1489202 ER PT J AU DAVIS, SF AF DAVIS, SF TI AN INTERFACE TRACKING METHOD FOR HYPERBOLIC SYSTEMS OF CONSERVATION-LAWS SO APPLIED NUMERICAL MATHEMATICS LA English DT Article ID ENO SCHEMES; ALGORITHMS; RESOLUTION AB This paper describes a method for tracking contact discontinuities and material interfaces that arise in the solution of hyperbolic systems of conservation laws. Numerical results arc presented to show that the fronts are resolved to within a mesh interval and smooth portions of the solution are computed to within the accuracy of the underlying numerical scheme. RP DAVIS, SF (reprint author), USN, CTR SURFACE WARFARE, CODE R44, WHITE OAK, MD 20903 USA. NR 36 TC 26 Z9 26 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9274 EI 1873-5460 J9 APPL NUMER MATH JI Appl. Numer. Math. PD NOV PY 1992 VL 10 IS 6 BP 447 EP 472 DI 10.1016/S0168-9274(06)80001-2 PG 26 WC Mathematics, Applied SC Mathematics GA JZ223 UT WOS:A1992JZ22300001 ER PT J AU ROSS, V ROMAN, L RUSHIN, JM COBB, MW FRIEDMAN, KJ AF ROSS, V ROMAN, L RUSHIN, JM COBB, MW FRIEDMAN, KJ TI XANTHOMATIZED ATYPICAL T-CELLS IN A PATIENT WITH MYCOSIS-FUNGOIDES AND HYPERLIPIDEMIA SO ARCHIVES OF DERMATOLOGY LA English DT Article ID HEMOPHAGOCYTIC SYNDROME; SUBCUTANEOUS TISSUE; LYMPHOCYTES-T; ATHEROGENESIS AB Background.-Lipoprotein-T-cell interactions are being reported with increasing frequency, and there is evidence that lipoproteins play a role in immunoregulation. We describe a patient with mycosis fungoides and hyperlipidemia who developed xanthomatization in one preexisting plaque. The case is unique in that some of the lipidized cells were atypical T cells. In previously reported cases of mycosis fungoides with dystrophic xanthomatosis, the lipid-containing cells have been identified only as histiocytes. Observations.-Immunopathologic feautures, electron microscopy, and lipid stains of the xanthomatized plaque demonstrated that some of the lipid-laden cells were atypical T cells. Conclusions.-In mycosis fungoides, malignant T cells may be intimately involved in processing of tissue lipids. We suggest that low-density lipoprotein receptors on activated T cells facilitated the cytoplasmic lipidization in this case. C1 USN, NATL MED CTR, DEPT LAB MED, BETHESDA, MD 20814 USA. NIH, HEMATOPATHOL SECT, PATHOL LAB, BETHESDA, MD 20892 USA. UNIFORMED SERV UNIV HLTH SCI, DEPT DERMATOL, BETHESDA, MD 20814 USA. RP ROSS, V (reprint author), USN, NATL MED CTR, DEPT DERMATOL, BETHESDA, MD 20814 USA. NR 18 TC 6 Z9 6 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 330 N WABASH AVE, STE 39300, CHICAGO, IL 60611-5885 USA SN 0003-987X EI 1538-3652 J9 ARCH DERMATOL JI Arch. Dermatol. PD NOV PY 1992 VL 128 IS 11 BP 1499 EP 1502 PG 4 WC Dermatology SC Dermatology GA JX149 UT WOS:A1992JX14900009 ER PT J AU AUGUSTEIJN, T KARATASOS, K PAPADAKIS, M PATERAKIS, G KIKUCHI, S BROSCH, N LEIBOWITZ, E HERTZ, P MITSUDA, K DOTANI, T LEWIN, WHG VANDERKLIS, M VANPARADIJS, J AF AUGUSTEIJN, T KARATASOS, K PAPADAKIS, M PATERAKIS, G KIKUCHI, S BROSCH, N LEIBOWITZ, E HERTZ, P MITSUDA, K DOTANI, T LEWIN, WHG VANDERKLIS, M VANPARADIJS, J TI COORDINATED X-RAY AND OPTICAL OBSERVATIONS OF SCORPIUS X-1 SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE ACCRETION, ACCRETION DISKS; STARS, SCO X-1; X-RAYS, BINARIES; PHOTOMETRY ID QUASI-PERIODIC OSCILLATIONS; CYGNUS X-2; MULTIWAVELENGTH CAMPAIGN; SPECTRAL BEHAVIOR; ULTRAVIOLET; BINARIES; GINGA; IUE AB We present the results of coordinated, partly simultaneous, optical and X-ray (Ginga) observations of the low-mass X-ray binary Sco X-1. We find that the division between the optically bright and faint state, at a blue magnitude B = 12.8, corresponds to the change from the normal to the flaring branch in the X-ray colour-colour diagram as proposed by Priedhorsky et al. (1986). From archival Walraven data we find that in both optical states the orbital light curve is approximately sinusoidal, and have a similar amplitudes. C1 CTR HIGH ENERGY ASTROPHYS, 1098 SJ AMSTERDAM, NETHERLANDS. NATL ASTRON OBSERV, DODAIRA OBSERV, MITAKA, TOKYO 181, JAPAN. MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. TEL AVIV UNIV, WISE OBSERV, IL-69978 TEL AVIV, ISRAEL. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. MIT, CTR SPACE RES, CAMBRIDGE, MA 02139 USA. INST SPACE & ASTRONAUT SCI, SAGAMIHARA, KANAGAWA 229, JAPAN. RP AUGUSTEIJN, T (reprint author), UNIV AMSTERDAM, ASTRON INST ANTON PANNEKOEK, KRUISLAAN 403, 1098 SJ AMSTERDAM, NETHERLANDS. RI Brosch, Noah/C-7889-2009; Mitsuda, Kazuhisa/C-2649-2008; Karatasos, Konstantinos /D-1525-2013 NR 34 TC 24 Z9 24 U1 0 U2 1 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD NOV PY 1992 VL 265 IS 1 BP 177 EP 182 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JX135 UT WOS:A1992JX13500024 ER PT J AU SEIDELMANN, PK FUKUSHIMA, T AF SEIDELMANN, PK FUKUSHIMA, T TI WHY NEW TIME SCALES SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE TIME SPACE; TIME COORDINATE SYSTEMS; ASTRONOMICAL CONSTANTS; GENERAL THEORY OF RELATIVITY AB At the International Astronomical Union (IAU) General Assembly in Buenos Aires, Argentina in 1991, the name Terrestrial Time (TT) was introduced to replace Terrestrial Dynamical Time (TDT) and the terminologies Geocentric Coordinate Time (TCG) and Barycentric Coordinate Time (TCB) were introduced (IAU 1992). The reasons for these time-like arguments and their applications will be presented. The relationships between the different time-like arguments will be discussed along with their applications and relationships to the astronomical constants. C1 NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. RP SEIDELMANN, PK (reprint author), USN OBSERV, WASHINGTON, DC 20392 USA. NR 15 TC 32 Z9 34 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD NOV PY 1992 VL 265 IS 2 BP 833 EP 838 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JY167 UT WOS:A1992JY16700057 ER PT J AU WALLIN, JF STUART, BV AF WALLIN, JF STUART, BV TI MASS-TRANSFER AND LOSS IN INTERACTING DISK GALAXIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INTERACTIONS; METHODS, NUMERICAL ID SHELL GALAXIES; POTENTIALS; RIPPLES; MODEL AB Simulations to measure the total amount of mass lost and transferred from disks in interacting galaxy systems were conducted using a massively parallel restricted three-body dynamics code. With the extremely high speed of this code, we conducted over 1000 simulated galaxy encounters each with 8192 test particles in the disk of the main galaxy. Based on these simulations, we present the relationships between the total amount of mass lost and transferred and the mass ratios, impact parameters, inclination, argument of periapse, and halo size for parabolic encounters involving a disk galaxy. RP WALLIN, JF (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4129,WASHINGTON,DC 20375, USA. NR 25 TC 17 Z9 17 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 1 PY 1992 VL 399 IS 1 BP 29 EP 37 DI 10.1086/171899 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JV047 UT WOS:A1992JV04700004 ER PT J AU HILAND, DA JENKINS, FH ARTHUR, DC MILLER, KP AF HILAND, DA JENKINS, FH ARTHUR, DC MILLER, KP TI SUCCESS RATE ANALYSIS OF NAVY SERGRAD FLIGHT TRAINING SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB SERGRADS are selectively retained graduates of Naval Flight Training who become flight instructors during their first tour as Naval Aviators. A perception exists that SERGRADS have more difficulties than newly designated pilots during subsequent training in the Fleet Replacement Squadrons (FRS). A preliminary inquiry at the F/A-18 FRS revealed that former SERGRADS appear to experience a higher rate of failure on their initial carrier qualification attempt during FRS training. This study examined the SERGRAD experience and compared their performance to trainees from other sources. Although significant differences were found between groups for Fleet Replacement Squadron flight grades and Training Command composite grades, no significant differences were found between the groups for Training Command carrier qualification grades or Fleet Replacement Squadron carrier qualification. Thus, the data do not support the hypothesis that SERGRADS have more problems or are poorer aviators than F/A-18 students from other sources. RP HILAND, DA (reprint author), USN,INST AEROSP MED,CODE 32R,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 9 TC 0 Z9 0 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 NOV PY 1992 VL 63 IS 11 BP 957 EP 960 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA JV794 UT WOS:A1992JV79400002 PM 1445158 ER PT J AU BOWERS, C SALAS, E PRINCE, C BRANNICK, M AF BOWERS, C SALAS, E PRINCE, C BRANNICK, M TI GAMES TEAMS PLAY - A METHOD FOR INVESTIGATING TEAM COORDINATION AND PERFORMANCE SO BEHAVIOR RESEARCH METHODS INSTRUMENTS & COMPUTERS LA English DT Article AB Teams are playing an increasingly important role in the workplace. However, reviews of the team performance literature have suggested that there are serious deficiencies in our understanding of team processes and performance (e.g., Dyer, 1984). These difficulties may be attributable, in part, to the lack of laboratory methodologies to investigate team performance. This paper describes the use of low-fidelity simulations as a potentially useful paradigm for researching team coordination and performance. This paradigm is advantageous in that it offers relatively high levels of experimental control and task representation at a low cost. C1 USN,CTR TRAINING SYST,CODE 262,12350 RES PKWY,ORLANDO,FL 32826. UNIV CENT FLORIDA,ORLANDO,FL 32816. UNIV S FLORIDA,TAMPA,FL 33620. NR 22 TC 23 Z9 23 U1 0 U2 6 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0743-3808 J9 BEHAV RES METH INSTR JI Behav. Res. Methods Instr. Comput. PD NOV PY 1992 VL 24 IS 4 BP 503 EP 506 DI 10.3758/BF03203594 PG 4 WC Psychology, Mathematical; Psychology, Experimental SC Psychology GA JZ049 UT WOS:A1992JZ04900001 ER PT J AU AHLERS, ST SALANDER, MK SHURTLEFF, D THOMAS, JR AF AHLERS, ST SALANDER, MK SHURTLEFF, D THOMAS, JR TI TYROSINE PRETREATMENT ALLEVIATES SUPPRESSION OF SCHEDULE-CONTROLLED RESPONDING PRODUCED BY CORTICOTROPIN RELEASING-FACTOR (CRF) IN RATS SO BRAIN RESEARCH BULLETIN LA English DT Article DE CORTICOTROPIN RELEASING FACTOR; TYROSINE; NOREPINEPHRINE; DOPAMINE; STRESS; SCHEDULE-CONTROLLED BEHAVIOR; PRECURSOR ID LOCUS COERULEUS; STRESS; DEPRESSION; AMPHETAMINE; ACTIVATION; PRECURSOR; BEHAVIOR; DOPAMINE; SYSTEM; BRAIN AB Disruption of performance observed when animals are exposed to physical stressors which deplete brain catecholamines can be alleviated by pretreatment with the catecholamine precursor tyrosine. Central administration of the stress hormone corticotropin releasing factor (CRF) has been shown to affect a variety of behaviors and also to potently increase the release of central catecholamines. Since CRF-induced disruption of behavior may involve CRF-induced depletion of brain catecholamines, the present study examined whether tyrosine would alleviate suppression of schedule-controlled responding in rats resulting from ICV administration of CRF. Administration of CRF (1.0 mug-10 mug) produced dose-dependent suppression of response rate and total number of earned reinforcers in rats responding on a multiple fixed-interval 60 s/fixed-ratio 20 schedule for food reinforcement. Pretreatment with 200 mg/kg tyrosine (IP) administered with ICV saline decreased response rate but did not lower total reinforcers, whereas 400 mg/kg of tyrosine decreased both. Injection of 400 mg/kg tyrosine reduced, but did not completely restore, induced suppression of behavior. The 200 mg/kg tyrosine dose was less effective in alleviating CRF-induced suppression of performance. These data indicate that pretreatment with the catecholamine precursor tyrosine can partially ameliorate performance decrements resulting from CRF administration. RP AHLERS, ST (reprint author), USN,MED RES INST,THERMAL STRESS ADAPT PROGRAM,BETHESDA,MD 20889, USA. NR 39 TC 7 Z9 7 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0361-9230 J9 BRAIN RES BULL JI Brain Res. Bull. PD NOV PY 1992 VL 29 IS 5 BP 567 EP 571 DI 10.1016/0361-9230(92)90124-G PG 5 WC Neurosciences SC Neurosciences & Neurology GA JU250 UT WOS:A1992JU25000005 PM 1422854 ER PT J AU DOANE, SM PELLEGRINO, JW ALDERTON, DL LIU, AH AF DOANE, SM PELLEGRINO, JW ALDERTON, DL LIU, AH TI TRANSFER OF VISUAL COMPARISON SKILLS - THE ROLE OF STRATEGIES AND RESPONSE CRITERIA SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Meeting Abstract C1 UNIV ILLINOIS,URBANA,IL 61801. VANDERBILT UNIV,NASHVILLE,TN 37240. USN,CTR PERSONNEL RES & DEV,WASHINGTON,DC 20350. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD NOV PY 1992 VL 30 IS 6 BP 462 EP 463 PG 2 WC Psychology, Mathematical SC Psychology GA JV167 UT WOS:A1992JV16700274 ER PT J AU WILLIAMS, D AF WILLIAMS, D TI IS A SUFFIXED AUDITORY LIST EQUIVALENT TO A VISUAL LIST SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Meeting Abstract C1 USN,HLTH RES CTR,SAN DIEGO,CA 92152. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD NOV PY 1992 VL 30 IS 6 BP 480 EP 480 PG 1 WC Psychology, Mathematical SC Psychology GA JV167 UT WOS:A1992JV16700455 ER PT J AU GREEN, JM TURKA, LA JUNE, CH THOMPSON, CB AF GREEN, JM TURKA, LA JUNE, CH THOMPSON, CB TI CD28 AND STAPHYLOCOCCAL ENTEROTOXINS SYNERGIZE TO INDUCE MHC-INDEPENDENT T-CELL PROLIFERATION SO CELLULAR IMMUNOLOGY LA English DT Article ID CLASS-II MOLECULES; HLA-DR; LYMPHOCYTES-T; TARGET-CELLS; ACTIVATION; BINDING; IDENTIFICATION; SUPERANTIGEN; STIMULATION; REQUIREMENT C1 UNIV MICHIGAN,MED CTR,DEPT INTERNAL MED,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT MICROBIOL IMMUNOL,ANN ARBOR,MI 48109. USN,MED RES CTR,BETHESDA,MD 20814. RP GREEN, JM (reprint author), UNIV MICHIGAN,MED CTR,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109, USA. NR 28 TC 36 Z9 36 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0008-8749 J9 CELL IMMUNOL JI Cell. Immunol. PD NOV PY 1992 VL 145 IS 1 BP 11 EP 20 DI 10.1016/0008-8749(92)90308-C PG 10 WC Cell Biology; Immunology SC Cell Biology; Immunology GA JX878 UT WOS:A1992JX87800002 PM 1330329 ER PT J AU PARENT, DC ANDERSON, SL AF PARENT, DC ANDERSON, SL TI CHEMISTRY OF METAL AND SEMIMETAL CLUSTER IONS SO CHEMICAL REVIEWS LA English DT Review ID COLLISION-INDUCED DISSOCIATION; RESONANCE MASS-SPECTROMETRY; GAS-PHASE REACTIONS; BARE ALUMINUM CLUSTERS; SMALL CARBON CLUSTERS; CYCLOTRON RESONANCE; IRON CLUSTERS; ELECTRONIC-STRUCTURE; LASER VAPORIZATION; IONIZATION-POTENTIALS C1 SUNY STONY BROOK, DEPT CHEM, STONY BROOK, NY 11794 USA. RP USN, RES LAB, DIV CHEM, CODE 6113, WASHINGTON, DC 20375 USA. NR 137 TC 141 Z9 142 U1 1 U2 15 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0009-2665 EI 1520-6890 J9 CHEM REV JI Chem. Rev. PD NOV PY 1992 VL 92 IS 7 BP 1541 EP 1565 DI 10.1021/cr00015a004 PG 25 WC Chemistry, Multidisciplinary SC Chemistry GA JZ547 UT WOS:A1992JZ54700005 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 CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Article DE POLYMERIZABLE LIPID; PHOSPHOCHOLINE; LIPID MICROSTRUCTURES; PHASE PROPERTIES; LIGHT SCATTERING ID CHIRAL LIPID BILAYERS; MICROSTRUCTURES; PHOSPHATIDYLCHOLINES; MEMBRANES AB Aqueous dispersions of 1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine, on cooling below the chain melting temperature, form hollow cylindrical structures known as 'tubules'. We have studied the formation of tubules in methanol/water, ethanol/water and n-propanol/water. For each alcohol, them is a defined window of alcohol/water ratios in which the lipid precipitates with the tubule morphology. As the chain length of alcohol is increased, the window shifts towards lower alcohol fraction. Light scattering studies show that at very low lipid concentrations the tubules self-assemble directly from the isotropic phase where as for lipid concentrations greater than 4 mg/ml an intermediate L(alpha) phase is observed. These results indicate that the mechanism of tubule formation may be dependent on lipid concentration. C1 GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM,WASHINGTON,DC 20007. UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. RP RATNA, BR (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 26 TC 49 Z9 50 U1 0 U2 11 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-3084 J9 CHEM PHYS LIPIDS JI Chem. Phys. Lipids PD NOV PY 1992 VL 63 IS 1-2 BP 47 EP 53 DI 10.1016/0009-3084(92)90021-G PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA KE939 UT WOS:A1992KE93900007 PM 1486660 ER PT J AU LEWIS, R KUPKE, T AF LEWIS, R KUPKE, T TI INTERMANUAL DIFFERENCES ON SKILLED AND UNSKILLED MOTOR-TASKS IN NONLATERALIZED BRAIN-DYSFUNCTION SO CLINICAL NEUROPSYCHOLOGIST LA English DT Article ID PERFORMANCE; HEMISPHERE; DEFICITS AB Intermanual (right-left) comparison of motor and perceptual performances is an essential method of interpretation in clinical neuropsychology. Relatively deficient performance with one hand suggests contralateral hemispheric dysfunction. There could, however, be another reason for comparatively poor performance of the nonpreferred hand. If one assumes a greater adaptive component for performance with the nonpreferred (less practiced) hand on certain motor tasks, nonlateralized brain dysfunction could result in greater decrement for the nonpreferred hand. It was hypothesized that for Finger Tapping, Grooved Pegboard, and Television Writing Time (but not for Hand Dynamometer) intermanual differences favoring the preferred hand would be greater for epileptic patients with nonlateralized brain dysfunction than for controls. The hypothesis was supported, and the clinical implications are discussed. C1 LAFAYETTE CLIN,DETROIT,MI 48207. USN HOSP,PORTSMOUTH,VA. NR 23 TC 5 Z9 5 U1 0 U2 0 PU SWETS ZEITLINGER PUBLISHERS PI LISSE PA P O BOX 825, 2160 SZ LISSE, NETHERLANDS SN 0920-1637 J9 CLIN NEUROPSYCHOL JI Clin. Neuropsychol. PD NOV PY 1992 VL 6 IS 4 BP 374 EP 382 DI 10.1080/13854049208401865 PG 9 WC Psychology, Clinical; Clinical Neurology; Psychology SC Psychology; Neurosciences & Neurology GA KC737 UT WOS:A1992KC73700002 ER PT J AU PISTEK, P JOHNSON, DR AF PISTEK, P JOHNSON, DR TI A STUDY OF THE ICELAND-FAEROE FRONT USING GEOSAT ALTIMETRY AND CURRENT-FOLLOWING DRIFTERS SO DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID OCEAN APPLICATIONS PROGRAM; ATLANTIC; TIDES; AREA AB In this study we investigate the utility of GEOSAT altimetry for monitoring the Iceland-Faeroe frontal zone. Since an expected dynamic topography relief of 10-20 cm over the Iceland-Faeroe Front (IFF) was not much above the 10 cm uncertainty in GEOSAT observations, validation by AVHRR imagery and satellite-tracked drifters constituted an important part of the experiment. Sea Surface Height (SSH) relief of greater than 20 cm occurred along the western side of the IFF and along the eastern side, north of the Shetland Islands. However, with SSH relief of only 10-15 cm in the central region of the IFF, substantial difficulties were encountered in the ability to unambiguously monitor the location of the front. In contrast, frontal meanders with 20-30 cm SSH relief, current speeds up to 50 cm s-1 and radii of curvature of 25 km, were clearly observed on three occasions during the 2 year study. These meanders first appeared north of the Faeroe Islands, in the region from 6 to 8-degrees-W, and propagated southeastward at speeds of about 3.3 km day-1, being lost from view in the Faeroe-Shetland Channel. Their strong signals and lifetimes of 2-3 months would appear to make them important constituents of IFF dynamics. RP PISTEK, P (reprint author), USN,OCEANOG & ATMOSPHER RES LABS,REMOTE SENSING BRANCH,BAY ST LOUIS,MS 39529, USA. NR 29 TC 10 Z9 10 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0198-0149 J9 DEEP-SEA RES PD NOV-DEC PY 1992 VL 39 IS 11-12A BP 2029 EP 2051 DI 10.1016/0198-0149(92)90012-I PG 23 WC Oceanography SC Oceanography GA JY326 UT WOS:A1992JY32600012 ER PT J AU LUQI ROYCE, W AF LUQI ROYCE, W TI STATUS-REPORT - COMPUTER-AIDED PROTOTYPING SO IEEE SOFTWARE LA English DT Article C1 TRW CO INC,FAIRFAX,VA 22030. RP LUQI (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, 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 NOV PY 1992 VL 9 IS 6 BP 77 EP 81 DI 10.1109/52.168861 PG 5 WC Computer Science, Software Engineering SC Computer Science GA JX941 UT WOS:A1992JX94100010 ER PT J AU JANASWAMY, R AF JANASWAMY, R TI A FREDHOLM INTEGRAL-EQUATION METHOD FOR PROPAGATION PREDICTIONS OVER SMALL TERRAIN IRREGULARITIES SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article AB Two-dimensional propagation of vertical line source fields over lossy, irregular terrain is considered using the magnetic field integral equation. The terrain is characterized by its elevation profile and the local surface impedance, both of which may vary with distance. For treatment via the Fredholm integral equation, the domain under consideration is made finite by enclosing the terrain irregularity and the source within an arbitrary outer boundary. Absorbing boundary conditions are imposed on the outer boundary to reduce unwanted reflections from it. The integral equation is solved by the boundary element method with quadratic elements. Substantial comparison is made with specific canonical problems, with previously published results of other workers, and with measurements to validate the method. RP JANASWAMY, R (reprint author), USN, POSTGRAD SCH, DEPT ELECT & COMP ENGN, CODE EC-JS, MONTEREY, CA 93943 USA. NR 16 TC 6 Z9 6 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-926X EI 1558-2221 J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD NOV PY 1992 VL 40 IS 11 BP 1416 EP 1422 DI 10.1109/8.202719 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA KQ613 UT WOS:A1992KQ61300016 ER PT J AU ROSER, M CLAYTON, SR DELAHOUSSAYE, PR GARCIA, GA AF ROSER, M CLAYTON, SR DELAHOUSSAYE, PR GARCIA, GA TI HIGH-MOBILITY FULLY DEPLETED THIN-FILM SOS MOSFET SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Meeting Abstract C1 USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152. NR 4 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD NOV PY 1992 VL 39 IS 11 BP 2665 EP 2666 DI 10.1109/16.163534 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JU737 UT WOS:A1992JU73700087 ER PT J AU FUNK, KH LIND, JH AF FUNK, KH LIND, JH TI AGENT-BASED PILOT VEHICLE INTERFACES - CONCEPT AND PROTOTYPE SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article AB The task support system (TSS) is an integrative pilot-vehicle interface that consists of a collection of active software units called agents. System agents represent aircraft and environment systems and subsystems, providing databases and control interfaces to support the activities of task agents. Task agents represent tasks the pilot must accomplish in the mission. They assist the pilot by recognizing when the tasks should be started, configuring the cockpit for the tasks, alerting the pilot to potential errors, making recommendations on how to complete tasks, and automating tasks in certain cases. The TSS was evaluated in a simulation experiment as part of a prototype avionics system. Results of the experiment indicate that the TSS is effective in improving pilot performance and also was well liked by the pilots who tested it. C1 USN,CTR AIR WARFARE,DIV WEAP,POSTGRAD SCH DETACHMENT,MONTEREY,CA 93943. RP FUNK, KH (reprint author), OREGON STATE UNIV,DEPT IND & MFG ENGN,CORVALLIS,OR 97331, USA. NR 30 TC 3 Z9 4 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD NOV-DEC PY 1992 VL 22 IS 6 BP 1309 EP 1322 DI 10.1109/21.199458 PG 14 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KN763 UT WOS:A1992KN76300005 ER PT J AU GRABER, M JUNE, CH SAMELSON, LE WEISS, A AF GRABER, M JUNE, CH SAMELSON, LE WEISS, A TI THE PROTEIN TYROSINE KINASE INHIBITOR HERBIMYCIN-A, BUT NOT GENISTEIN, SPECIFICALLY INHIBITS SIGNAL TRANSDUCTION BY THE T-CELL ANTIGEN RECEPTOR SO INTERNATIONAL IMMUNOLOGY LA English DT Article DE GENISTEIN; HERBIMYCIN-A; T-CELL ANTIGEN RECEPTOR ID MUSCARINIC ACETYLCHOLINE-RECEPTOR; PHOSPHATIDYL-INOSITOL PATHWAY; PHOSPHOLIPASE-C; V-SRC; BIOCHEMICAL-CHARACTERIZATION; TOPOISOMERASE-II; RABBIT PLATELETS; IL-2 SECRETION; ALPHA-SUBUNITS; NIH-3T3 CELLS AB Several lines of evidence implicate a regulatory tyrosine phosphorylation in the activation of phospholipase C (PLC) by the T cell antigen receptor (TCR). These include studies using inhibitors of protein tyrosine kinases (PTKs). In Jurkat T cells expressing the heterologous human muscarinic receptor (HM1), PLC activity can be induced by either the TCR or HM1. HM1 activates PLC via a guanine nucleotide binding protein. We have studied the selectivity of the effects of the PTK inhibitors, herbimycin A and genistein, in this system. The results indicate that these inhibitors have different mechanisms of action, and suggest that herbimycin A, but not genistein, is a specific inhibitor of PTKs in T cells. Herbimycin A markedly inhibited both the resting and induced levels of phosphotyrosine-containing proteins, including the gamma1 isozyme of PLC and the zeta chain of the TCR, and prevented activation of PLC by anti-TCR mAb. Herbimycin A did not inhibit activation of PLC by HM1. Genistein had a much less pronounced effect than herbimycin A on the appearance of tyrosine phosphoproteins. Moreover, genistein inhibited activation of PLC by both the TCR and HM1, and inhibition was only partial. Genistein was cytotoxic and markedly inhibited protein synthesis in both Jurkat cells and human peripheral lymphocytes. Herbimycin A was not cytotoxic. These findings confirm the role of a regulatory tyrosine phosphorylation in activation of PLC by the TCR. Herbimycin A was a selective inhibitor of a subclass of PTKs in Jurkat cells. In contrast, inhibition of signal transduction and later events in T cells by genistein may be due to effects other than direct inhibition of PTK activity. C1 UNIV CALIF SAN FRANCISCO,DEPT MICROBIOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT IMMUNOL,SAN FRANCISCO,CA 94143. USN,MED RES CTR,BETHESDA,MD 20814. NICHHD,CELL BIOL & METAB BRANCH,BETHESDA,MD 20892. RP GRABER, M (reprint author), UNIV CALIF SAN FRANCISCO,DEPT MED,SAN FRANCISCO,CA 94143, USA. FU NIDDK NIH HHS [K 11 DK01945-01] NR 64 TC 59 Z9 59 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0953-8178 J9 INT IMMUNOL JI Int. Immunol. PD NOV PY 1992 VL 4 IS 11 BP 1201 EP 1210 DI 10.1093/intimm/4.11.1201 PG 10 WC Immunology SC Immunology GA JZ112 UT WOS:A1992JZ11200001 PM 1472473 ER PT J AU BOURELL, DL FRAZIER, WE AF BOURELL, DL FRAZIER, WE TI IN THE AEROSPACE MATERIALS PROCESSING FIELD, EVERYTHING OLD IS NEW AGAIN SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article C1 USN,AIR WARFARE CTR,WARMINSTER,PA 18974. RP BOURELL, DL (reprint author), UNIV TEXAS,COLL ENGN,AUSTIN,TX 78712, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD NOV PY 1992 VL 44 IS 11 BP 44 EP 44 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JY343 UT WOS:A1992JY34300008 ER PT J AU FRAZIER, WE CHEN, JSJ AF FRAZIER, WE CHEN, JSJ TI THE MELT SPINNING OF GAMMA-TITANIUM ALUMINIDES SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article ID PLANAR AB Rapid solidification shows great promise for the production of gamma titanium aluminides, and one of the most interesting rapid solidification techniques is melt spinning. In this work, melt-spun Ti-55Al and Ti-48Al-2Cr-2Ta (atomic percent) were produced; the resulting alloys had uniform mi crostructure and composition. In addition, the investigation showed the utility of a model developed to describe heat transfer and fluid flow in melt spinning. C1 TEMPLE UNIV,DEPT MECH ENGN,GRAD PROGRAM CHAIR,PHILADELPHIA,PA 19122. RP FRAZIER, WE (reprint author), USN,CTR AIR WARFARE,MET & CERAM PROC TEAM,WARMINSTER,PA 18974, USA. NR 14 TC 5 Z9 5 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD NOV PY 1992 VL 44 IS 11 BP 52 EP 55 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JY343 UT WOS:A1992JY34300010 ER PT J AU SMITH, RA GUTMARK, E SCHADOW, KC AF SMITH, RA GUTMARK, E SCHADOW, KC TI MITIGATION OF PRESSURE OSCILLATIONS INDUCED BY SUPERSONIC-FLOW OVER SLENDER CAVITIES SO JOURNAL OF AIRCRAFT LA English DT Article AB Supersonic flow over a slender cavity excited high-frequency and high-g vibrational forces inside the cavity. The excitation of the whistle is caused by vortex shedding at the upstream end of the cavity and vortex interaction with the downstream end of the cavity associated with sound generation. The sound is fed back upstream and drives the vortex-shedding process. To suppress the acoustic whistle, an experimental test program was undertaken to characterize the acoustic cavity oscillations in a deep and narrow cavity, using microphones and flow visualization, and reduce the coherence of the vortices by geometric changes of the upstream end of the cavity. The changes that included multisteps and pins extending into the supersonic approach now were selected to break up the orderly development of coherent vortices under acoustic excitation. With these passive shear-flow control devices, acoustic amplitude reductions by a maximum factor of 5 were obtained, essentially eliminating acoustic pressure oscillation in the cavity over the entire range of Mach numbers tested. In this article, the detailed geometric and flow parameter variation and its effect on the cavity pressure oscillations are described. RP SMITH, RA (reprint author), USN,CTR AIR WARFARE,RES DEPT,CHINA LAKE,CA 93555, USA. OI Gutmark, Ephraim/0000-0001-7816-4257 NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD NOV-DEC PY 1992 VL 29 IS 6 BP 999 EP 1004 DI 10.2514/3.46276 PG 6 WC Engineering, Aerospace SC Engineering GA KB465 UT WOS:A1992KB46500005 ER PT J AU HEBBAR, SK LEEDY, DH AF HEBBAR, SK LEEDY, DH TI WIND-TUNNEL INVESTIGATION OF A FIGHTER MODEL AT HIGH ANGLES OF ATTACK SO JOURNAL OF AIRCRAFT LA English DT Article AB A low-speed wind-tunnel investigation was conducted to examine the aerodynamic characteristics of the flowfield around a 3% scale model of YF-17 lightweight fighter prototype at high angles of attack using laser sheet flow visualization and force and moment measurements. The data indicate a good correlation between the observed flow phenomena and force and moment measurements at various orientations of the model, thus establishing the credibility of such experimental investigations for high-angle-of-attack aerodynamic research. The asymmetric shedding of vortices generated by the slender nose and leading-edge extensions (strakes) of the model dominate the aerodynamic phenomenon between 45- and 65-deg angle of attack. The roll and yaw angles have considerable influence on vortex development and consequently on flow behavior al high angles of attack. RP HEBBAR, SK (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 0 TC 3 Z9 3 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD NOV-DEC PY 1992 VL 29 IS 6 BP 1091 EP 1097 DI 10.2514/3.46290 PG 7 WC Engineering, Aerospace SC Engineering GA KB465 UT WOS:A1992KB46500019 ER PT J AU COLOMBANT, DG LAU, YY AF COLOMBANT, DG LAU, YY TI MODEL OF CAVITY COUPLING FOR BEAM BREAKUP CONTROL SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The coupling of the accelerating cavities to dummy cavities was recently found to reduce beam breakup growth. This article analyzes a more sophisticated model that includes the time delay between coupled cavities and covers the possibilities of wave cutoff and resonance in the coupling path. A dispersion relation is obtained. We show that the peak spatial exponentiation rate of the dominant beam breakup mode is reduced by as much as a factor of 2, and this reduction is insensitive to the coupling path length. Other modes are destabilized, however, but they have lower growth rates, in general. RP COLOMBANT, DG (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 9 TC 2 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 1 PY 1992 VL 72 IS 9 BP 3874 EP 3877 DI 10.1063/1.352263 PG 4 WC Physics, Applied SC Physics GA JW937 UT WOS:A1992JW93700004 ER PT J AU RAI, AK PROKES, SM AF RAI, AK PROKES, SM TI WET OXIDATION OF AMORPHOUS SI-GE LAYER DEPOSITED ON SI(001) AT 800-DEGREES-C AND 900-DEGREES-C SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FILMS; SI(100); ALLOYS AB Amorphous Si0.56G0.44 films were deposited on (001)Si by electron beam evaporation in a vacuum having a base pressure of 10(-7) Torr. They were then wet oxidized at 800 and 900-degrees-C in an open tube furnace for various times. Cross (x)-sectional and plan view transmission electron microscope techniques were employed to characterize the samples. At 800-degrees-C, 30 min of wet oxidation produced a continuous polycrystalline Si-Ge layer, whereas 60 min of wet oxidation produced a discontinuous polycrystalline layer. After 100 min of wet oxidation at 800-degrees-C, the Si-Ge layer was almost completely oxidized and no observable evidence of the epitaxial Si-Ge layer was found. Wet oxidation at 900-degrees-C for 10 min produced a bilayer structure; one epitaxial and one polycrystalline layer separated by a contamination layer initially present on the substrate prior to deposition. A mostly epitaxial Si-Ge layer was obtained after 30 min of wet oxidation at 900-degrees-C. These results will be discussed in terms of a previously suggested epitaxial growth model. The failure to obtain an observable epitaxial Si-Ge layer by wet oxidation at 800-degrees-C will be discussed by consideration of changes in the kinetics and the stability of both SiO2 and GeO2 at this temperature. C1 USN,RES LAB,WASHINGTON,DC 20375. RP RAI, AK (reprint author), UES INC,4401 DAYTON XENIA RD,DAYTON,OH 45432, USA. NR 14 TC 15 Z9 16 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 1 PY 1992 VL 72 IS 9 BP 4020 EP 4025 DI 10.1063/1.352255 PG 6 WC Physics, Applied SC Physics GA JW937 UT WOS:A1992JW93700023 ER PT J AU MERKLE, LD GRUBER, JB SELTZER, MD STEVENS, SB ALLIK, TH AF MERKLE, LD GRUBER, JB SELTZER, MD STEVENS, SB ALLIK, TH TI SPECTROSCOPIC ANALYSIS OF TM3+-NALA(MOO4)2 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ENERGY-LEVELS; ND-3+; GARNET AB Absorption spectra of trivalent thulium (Tm3+, 4f12) doped double molybdate NaLa(MoO4)2 (NLM) are reported between 370 and 2000 nm at approximately 16 K. Laser-excited fluorescence spectra obtained at 4.2 K from multiplet manifolds G-1(4) and H-3(4) to manifolds F-3(4) and the ground state H-3(6) are also reported. The observed spectra are broad in this disordered host as compared with the spectra observed for Tm3+:YAG (yttrium aluminum garnet). The observed crystal field splitting of the multiplet manifolds in Tm3+:NLM is in reasonable agreement with the calculated splitting based on smoothed crystal field parameters obtained from an analysis of Nd3+:NLM and Er3+:NLM. The smaller crystal field splitting in Tm3+:NLM as compared with Tm3+:YAG may discourage cross-relaxation from the H-3(4) to the F-3(4) manifold in this host. This in tum may favor laser operation on the H-3(4) --> F-3(4) transitions over the F-3(4) --> H-3(6) transitions. C1 SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192. USN,CTR AIR WARFARE,RES DEPT,CHINA LAKE,CA 93555. SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP MERKLE, LD (reprint author), NIGHT VIS & ELECTROOPT DIRECTORATE,DIV LASERS & PHOTON,FT BELVOIR,VA 22060, USA. NR 22 TC 23 Z9 23 U1 1 U2 4 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 1 PY 1992 VL 72 IS 9 BP 4269 EP 4274 DI 10.1063/1.352215 PG 6 WC Physics, Applied SC Physics GA JW937 UT WOS:A1992JW93700062 ER PT J AU WALDRON, A AF WALDRON, A TI ASIAN FRONTIER NATIONALISM - LATTIMORE,OWEN AND THE AMERICAN POLICY DEBATE - COTTON,J SO JOURNAL OF ASIAN STUDIES LA English DT Book Review RP WALDRON, A (reprint author), USN WAR COLL,NEWPORT,RI, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU ASSN ASIAN STUDIES INC PI ANN ARBOR PA UNIV MICH 1 LANE HALL, ANN ARBOR, MI 48109 SN 0021-9118 J9 J ASIAN STUD JI J. Asian Stud. PD NOV PY 1992 VL 51 IS 4 BP 889 EP 890 DI 10.2307/2059059 PG 2 WC Area Studies; Asian Studies SC Area Studies; Asian Studies GA KB985 UT WOS:A1992KB98500024 ER PT J AU CHEN, CH CHIU, CT STRINGFELLOW, GB GEDRIDGE, RW AF CHEN, CH CHIU, CT STRINGFELLOW, GB GEDRIDGE, RW TI TRIISOPROPYLINDIUM FOR OMVPE GROWTH SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON METALORGANIC VAPOR PHASE EPITAXY ( ICMOVPE-VI ) CY JUN 08-11, 1992 CL CAMBRIDGE, MA ID VAPOR-PHASE EPITAXY; INP; INAS AB The organometallic vapor phase epitaxial (OMVPE) growth of In-containing III-V semiconductors typically uses trimethylindium (TMIn). However, TMIn suffers from several problems. This work reports the first decomposition and OMVPE growth studies for a newly developed indium source, triisopropylindium (TTPIn). The decomposition study shows that te temperature for 50% decomposition is approximately 110-degrees-C for TIPIn in a He ambient, much lower than for TMIn. InAs epilayers with good surface morphologies were obtained at temperatures as low as 300-degrees-C. The necessary V/III ratio increases as the growth temperature is decreased, due to the incomplete decomposition of AsH3 at low temperatures. Since TIPIn contains C3H7 radicals which are far less reactive than the CH3 radicals in TMIn, the InAs grown using TIPIn has carbon concentrations several orders of magnitude lower than when TMIn is used. C1 USN,CTR AIR WARFARE,DIV CHEM,CHINA LAKE,CA 93555. RP CHEN, CH (reprint author), UNIV UTAH,DEPT MAT SCI & ENGN,SALT LAKE CITY,UT 84112, USA. NR 16 TC 7 Z9 7 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD NOV PY 1992 VL 124 IS 1-4 BP 88 EP 92 DI 10.1016/0022-0248(92)90442-L PG 5 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA KB905 UT WOS:A1992KB90500015 ER PT J AU BIEFELD, RM GEDRIDGE, RW AF BIEFELD, RM GEDRIDGE, RW TI THE GROWTH OF INSB USING TRIISOPROPYLANTIMONY OR TERTIARYBUTYLDIMETHYLANTIMONY AND TRIMETHYLINDIUM SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON METALORGANIC VAPOR PHASE EPITAXY ( ICMOVPE-VI ) CY JUN 08-11, 1992 CL CAMBRIDGE, MA ID VAPOR-PHASE EPITAXY; MOCVD; GAAS AB The growth of InSb using triisopropylantimony (TIPSb) or tertiarybutyldimethylantimony (TBDMSb) and TMIn was investigated over a temperature range of 350 to 475-degrees-C. The growth rates of InSb using TMIn and either TIPSb or TBDMSb at temperatures less-than-or-equal-to 425-degrees-C were proportional to both the TMIn flow rate and the temperature. The surface morphology of InSb grown using either TIPSb or TBDMSb was very rough for growth temperatures less-than-or-equal-to 425-degrees-C. The InSb with the highest mobility was grown at 400-degrees-C and a 5/3 ratio of 3 using TIPSb. It was n-type with a carrier concentration of 2.5 X 10(15) cm-3 and a mobility of 78,160 cm2/V. s at 77 K. Both n- and p-type InSb were grown using TBDMSb with mobilities up to 67,530 and 7773 cm2/V.s, respectively at 77 K. The mobility for InSb using either TIPSb or TBDMSb was optimized by going to lower temperatures, pressures and 5/3 ratios. The opposite was true for surface morphology which improved with higher temperature, pressure, and 513 ratio. The growth of high mobility InSb with smooth surfacestat T less-than-or-equal-to 425-degrees-C was not achievable with TIPSb or TBDMSb and TMIn. C1 USN,CTR AIR WARFARE,CHINA LAKE,CA 93555. RP BIEFELD, RM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 18 TC 15 Z9 15 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD NOV PY 1992 VL 124 IS 1-4 BP 150 EP 157 DI 10.1016/0022-0248(92)90452-O PG 8 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA KB905 UT WOS:A1992KB90500025 ER PT J AU GRAHAM, RM MASON, NJ WALKER, PJ FRIGO, DM GEDRIDGE, RW AF GRAHAM, RM MASON, NJ WALKER, PJ FRIGO, DM GEDRIDGE, RW TI MOVPE GROWTH OF INSB ON GAAS SUBSTRATES SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON METALORGANIC VAPOR PHASE EPITAXY ( ICMOVPE-VI ) CY JUN 08-11, 1992 CL CAMBRIDGE, MA ID MOLECULAR-BEAM EPITAXY; CHEMICAL VAPOR-DEPOSITION; HETEROEPITAXIAL INSB; PHASE EPITAXY; FILMS; TEMPERATURE; INAS1-XSBX; GASB; TRIISOPROPYLANTIMONY; REACTORS AB The growth by MOVPE of InSb epilayers on GaAs substrates has been studied. There are a number of well established problems in the growth of this material by MOVPE including the high lattice mismatch of 14.5%, the low melting point of InSb, and the poor thermal cracking of the commonly used antimony precursor, trimethylantimony. In addition, there is the problem with the stability of the "pick-up" from trimethylindium bubblers, leading to poor compositional control. We have investigated the use of a number of techniques including the application of low temperature buffer layers of InSb and GaSb, the use of a novel internally heated resistance heater with two independent zones to allow pre-cracking of the alkyls, and the use of alternative sources for both indium and antimony. Indium precursors used have been TMIn, EDMIn, a mixture of TMIn/TEIn and a saturated solution of TMIn in an involatile solvent. As well as TMSb, a new antimony source, tertiarybutyldimethylantimony (TBDMSb), has been assessed. The growth temperature was between 400 and 480-degrees-C, depending on the precursors used. A wide range of III/V ratios were investigated for the various combinations of precursors and combinations of pre-cracking and no pre-cracking. Epilayers were analysed for thickness, surface quality and electrical quality at room temperature and 77 K. In addition to the growth experiments, two analytical techniques have been used to monitor the InSb growth. The first involves the use of quasi-elastic light scattering of a He/Ne laser beam from the growing surface. The scattered light is very sensitive to the degree of surface roughness, so the transition from 2D to 3D growth can be easily seen by monitoring the scattered light from the surface with a silicon photodiode and an optical filter to allow only the laser light to be collected. Some modifications to the growth cell were necessary to keep the top area clean for access by the laser beam. The relative effectiveness of various growth regimes and buffer layers can be investigated by this method and the results correlated with optical and SEM micrographs. The second technique involves the application of ultra-violet spectroscopy to study the effective pick-up rates from a variety of alkyl sources. Metalorganic sources such as TMIn absorb conveniently in the 300-180 nm range, so a simple UV set up incorporating a single pass cell with a 10 cm path length has been used to record the spectra of the various alkyls used in this study, and to compare the pick-up rates from different sources and different designs of bubbler, concentrating on various indium sources. This technique also allows "in-situ" monitoring of the concentrations of alkyls present in the reactor, but this has not been pursued in this case. C1 BILLITON RES BV,ARNHEM,NETHERLANDS. USN,CTR AIR WARFARE,CHINA LAKE,CA 93555. RP GRAHAM, RM (reprint author), UNIV OXFORD,CLARENDON LAB,DEPT PHYS,OXFORD,ENGLAND. NR 37 TC 12 Z9 12 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD NOV PY 1992 VL 124 IS 1-4 BP 363 EP 370 DI 10.1016/0022-0248(92)90485-2 PG 8 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA KB905 UT WOS:A1992KB90500058 ER PT J AU CLAWSON, AR VU, TT PAPPERT, SA HANSON, CM AF CLAWSON, AR VU, TT PAPPERT, SA HANSON, CM TI EFFECTS OF HYDROGEN-ONLY INTERRUPTS ON INGAAS/INP SUPERLATTICES GROWN BY OMVPE SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON METALORGANIC VAPOR PHASE EPITAXY ( ICMOVPE-VI ) CY JUN 08-11, 1992 CL CAMBRIDGE, MA ID QUANTUM-WELLS; GAINAS/INP; MOVPE; INP AB Superlattices of InGaAs/InP have been grown by OMVPE using short interval H-2-only growth interrupts to eliminate intermixing of hydride gases at the heterojunction interfaces. Changes in lattice strain resulting from interlayer alloying were measured by X-ray diffraction. The changes in strain are small and consistent with decomposition of the surfaces when exposed to the nonequilibrium H-2 vapor. Possible interface smoothing is seen with H-2 interrupt at the InGaAs to InP transition. A large compressive strain contribution is unaffected by the interrupts and is attributed to As carryover into the InP from surrounding solid deposits rather than the transport gases. C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,NRAD DIV,DIV ELECTR MAT SCI,SAN DIEGO,CA 92152. RP CLAWSON, AR (reprint author), UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093, USA. NR 15 TC 19 Z9 19 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD NOV PY 1992 VL 124 IS 1-4 BP 536 EP 540 DI 10.1016/0022-0248(92)90513-I PG 5 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA KB905 UT WOS:A1992KB90500086 ER PT J AU ARCHER, R READER, A NIST, R BECK, M MEYERS, WJ AF ARCHER, R READER, A NIST, R BECK, M MEYERS, WJ TI AN INVIVO EVALUATION OF THE EFFICACY OF ULTRASOUND AFTER STEP-BACK PREPARATION IN MANDIBULAR MOLARS SO JOURNAL OF ENDODONTICS LA English DT Article ID CURVED ROOT CANALS; HISTOLOGICAL-EVALUATION; DEBRIDEMENT; INVITRO; INSTRUMENTATION AB This study histologically compared the in vivo debridement efficacy of the step-back preparation versus a step-back/ultrasound preparation in the mesial root canals of vital mandibular molars. Group 1 consisted of 17 teeth prepared with a step-back technique using intermittent irrigation with 5.25% sodium hypochlorite. Group 2 consisted of 17 teeth prepared with a step-back technique as in group 1 followed by 3 min of ultrasonic instrumentation per canal utilizing a #15 Endosonic file in an Enac unit set at 3.5. An additional 6 ml/canal of 5.25% sodium hypochlorite was used during the ultrasonic preparation. Eight uninstrumented mandibular molars served as histological controls. Following extraction and histological preparation, 0.2-mum cross-sections from the 1- to 3-mm apical levels of the canal and isthmus were evaluated for percentage of tissue removal using an Olympus CUE-2 Image Analysis System. Factorial analysis of variance indicated canal and isthmus cleanliness values were significantly higher, at all 11 apical levels, with the ultrasonic technique. Sample values at the 1-, 2-, and 3-mm levels for the step-back and step-back/ultrasonic techniques, respectively, were: canal, 64% versus 92%, 81% versus 97%, and 90% versus 99.9%; isthmus, 2% versus 46%, 15% versus 60%, and 16% versus 83%. C1 OHIO STATE UNIV,COLL DENT,DEPT ENDODONT,305 W 12TH AVE,COLUMBUS,OH 43210. USN HOSP,PORTSMOUTH,VA. OHIO STATE UNIV,DEPT DIAGNOST SERV,COLUMBUS,OH 43210. NR 20 TC 26 Z9 27 U1 1 U2 2 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0099-2399 J9 J ENDODONT JI J. Endod. PD NOV PY 1992 VL 18 IS 11 BP 549 EP 552 DI 10.1016/S0099-2399(06)81212-4 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA KG639 UT WOS:A1992KG63900006 PM 1298792 ER PT J AU CROUCH, JD AF CROUCH, JD TI NONLOCALIZED RECEPTIVITY OF BOUNDARY-LAYERS SO JOURNAL OF FLUID MECHANICS LA English DT Article ID TOLLMIEN-SCHLICHTING WAVES; STABILITY; TRANSITION AB A perturbation scheme is developed to analyse the disturbance field produced by acoustic forcing over a flat plate with non-localized surface irregularities. Both the amplitude of the forcing and the height of the irregularity are assumed to be small. At first order, two modes are calculated: a Stokes mode resulting from the acoustic forcing, and a wall mode resulting from the surface irregularity. These modes interact at second order to produce a forced travelling wave with the frequency of the acoustic wave and a wavenumber associated with the surface irregularity. Streamwise variations in the mean flow mediate a distributed energy transfer between the forced mode and the eigenmode. Sufficiently far downstream, the forced-mode amplitude becomes small and the total disturbance is dominated by the resulting eigenmode. Receptivity amplitudes, expressed in terms of effective branch I values, are O(10) for a broad range of surface wavenumbers. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 21 TC 28 Z9 28 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD NOV PY 1992 VL 244 BP 567 EP 581 DI 10.1017/S0022112092003197 PG 15 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA JZ760 UT WOS:A1992JZ76000026 ER PT J AU ENGLE, IM AF ENGLE, IM TI DIURNAL-VARIATION IN JOVIAN SUBSOLAR MAGNETOPAUSE POSITION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Note ID MAGNETOSPHERE; PIONEER-10; JUPITER; FIELD AB The calculation of the idealized Jovian magnetosphere surface and magnetic fields arising from surface currents has been published (Engle, 1991). That calculation assumed the axis of all the interior sources of magnetic field to be perpendicular to the planet's orbital plane and hence to the incident solar wind. The rotation axis of Jupiter makes a small angle (3.13-degrees) with its orbital plane; the magnetic axis is aligned approximately 10-degrees with respect to the planet's rotation axis. The consequences are that the magnetic axis will precess about the planetary rotation axis during each diurnal rotation of period 9 hours and 55 min. The goal of the present work was to calculate the primary effects of this diurnal motion. In this paper are presented the results of calculations which have yielded global magnetopause models with the interior sources' axis tilted +/-10-degrees (in the noon-midnight plane) with respect to the normal to the "plane" of the incident solar wind (which is here approximated to be coincident with the planet's equatorial plane). The consequential diurnally cyclical range in predicted dynamically stable magnetopause positions in the neighborhood of the subsolar point is reported. The magnetic fields arising from the magnetohydrodynamically stable currents on the magnetopause have been calculated. Convenient expressions for those fields' total contributions for points in the inner magnetosphere are included. RP ENGLE, IM (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 9 TC 8 Z9 8 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD NOV 1 PY 1992 VL 97 IS A11 BP 17169 EP 17172 DI 10.1029/92JA02036 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JX753 UT WOS:A1992JX75300034 ER PT J AU LAPINSKY, AS MACK, GR AF LAPINSKY, AS MACK, GR TI AVASCULAR NECROSIS OF THE CAPITATE - A CASE-REPORT SO JOURNAL OF HAND SURGERY-AMERICAN VOLUME LA English DT Article C1 USN,DEPT CLIN INVEST,SAN DIEGO,CA 92134. NR 0 TC 11 Z9 11 U1 0 U2 0 PU CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS PI NEW YORK PA 650 AVENUE OF THE AMERICAS, NEW YORK, NY 10011 SN 0363-5023 J9 J HAND SURG-AM JI J. Hand Surg.-Am. Vol. PD NOV PY 1992 VL 17A IS 6 BP 1090 EP 1092 PG 3 WC Orthopedics; Surgery SC Orthopedics; Surgery GA JX315 UT WOS:A1992JX31500028 PM 1430946 ER PT J AU BROOK, I MYHAL, LA DORSEY, CH AF BROOK, I MYHAL, LA DORSEY, CH TI ENCAPSULATION AND PILUS FORMATION OF BACTEROIDES SPP IN NORMAL FLORA ABSCESSES AND BLOOD SO JOURNAL OF INFECTION LA English DT Article ID EPITHELIAL-CELLS; FRAGILIS; MELANINOGENICUS; CAPSULATE; ASACCHAROLYTICUS; PATHOGENICITY; STRAINS; SURFACE C1 USN,MED RES INST,BETHESDA,MD 20814. NR 22 TC 13 Z9 13 U1 0 U2 0 PU W B SAUNDERS CO LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0163-4453 J9 J INFECTION JI J. Infect. PD NOV PY 1992 VL 25 IS 3 BP 251 EP 257 DI 10.1016/0163-4453(92)91479-U PG 7 WC Infectious Diseases SC Infectious Diseases GA JY723 UT WOS:A1992JY72300002 PM 1361937 ER PT J AU HEGGIE, AD JACOBS, MR LINZ, PE HAN, DP KAPLAN, EL BOXERBAUM, B AF HEGGIE, AD JACOBS, MR LINZ, PE HAN, DP KAPLAN, EL BOXERBAUM, B TI PREVALENCE AND CHARACTERISTICS OF PHARYNGEAL GROUP-A BETA-HEMOLYTIC STREPTOCOCCI IN UNITED-STATES NAVY RECRUITS RECEIVING BENZATHINE PENICILLIN PROPHYLAXIS SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID ACUTE RHEUMATIC-FEVER; ERYTHROMYCIN RESISTANCE; WESTERN PENNSYLVANIA; RESURGENCE; OUTBREAK; PYOGENES; DISEASE; INFECTIONS; YOUNG; AREA AB US military recruits receive benzathine penicillin prophylaxis because of endemicity of group A beta-hemolytic streptococcal (GABHS) infections. GABHS prevalence in Navy recruits receiving single-dose benzathine penicillin prophylaxis was assessed during spring and fall 1989 by culturing throat specimens from randomly selected groups of approximately 230 men before and 2, 4, and 7 weeks after prophylaxis and from men with pharyngitis diagnosed at sick call. Of 60 GABHS isolates, 75% were serotype M-3. The pharyngitis rate increased from 0.18% in the spring to 1.55% in the fall with a concurrent increase in serotype M-3 prevalence from 35% to 91%. The GABHS prevalence rate was three- to fourfold lower after prophylaxis. There were no cases of acute rheumatic fever (ARF) despite predominance of M-3, a rheumatogenic serotype. It was concluded that penicillin prophylaxis continues to be effective for control of GABHS infections and prevention of ARF in Navy recruits. C1 UNIV MINNESOTA,MINNEAPOLIS,MN 55455. CASE WESTERN RESERVE UNIV,DEPT PEDIAT & PATHOL,CLEVELAND,OH 44106. USN HOSP,BRANCH CLIN 1017,GREAT LAKES,IL. WHO,COLLABORATING CTR REFERENCE & RES STREPTOCOCCI,CH-1211 GENEVA 27,SWITZERLAND. RP HEGGIE, AD (reprint author), UNIV HOSP CLEVELAND,DEPT PEDIAT,2074 ABINGTON RD,CLEVELAND,OH 44106, USA. NR 45 TC 9 Z9 9 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 NOV PY 1992 VL 166 IS 5 BP 1006 EP 1013 PG 8 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA JV015 UT WOS:A1992JV01500008 PM 1402011 ER PT J AU WEISS, PJ BRODINE, SK GOFORTH, RR KENNEDY, CA WALLACE, MR OLSON, PE GARLAND, FC HALL, FW ITO, SI OLDFIELD, EC AF WEISS, PJ BRODINE, SK GOFORTH, RR KENNEDY, CA WALLACE, MR OLSON, PE GARLAND, FC HALL, FW ITO, SI OLDFIELD, EC TI INITIAL LOW CD4 LYMPHOCYTE COUNTS IN RECENT HUMAN-IMMUNODEFICIENCY-VIRUS INFECTION AND LACK OF ASSOCIATION WITH IDENTIFIED COINFECTIONS SO JOURNAL OF INFECTIOUS DISEASES LA English DT Note ID T-CELL COUNTS; HOMOSEXUAL MEN; HIV-INFECTION; AIDS; SEROCONVERSION; PEOPLE AB Initial CD4 lymphocyte counts were studied in 244 patients with human immunodeficiency virus (HIV) seroconversion. The CD4 cell counts at initial presentation after seroconversion were normally distributed (mean, 579/mm3; SD, 252). The mean percentage of CD4 cells was 26.1% (SD, 5.6). CD4 cell counts were <500/mm3 in 41% and <200/mm3 in 4%. The mean calculated duration of HIV infection was 7.7 months, which was not significantly different between the highest and lowest CD4 count quartiles (8.1 vs. 7.9). Age, sex, race, and serologic evidence of toxoplasmosis, cytomegalovirus, hepatitis B, syphilis, and varicella-zoster virus were not associated with initial low CD4 cell counts; however, never-married men were significantly overrepresented in the lowest quartile. These findings suggest that extensive CD4 lymphocyte depletion is common in early HIV infection and that frequent screening is necessary to identify newly infected patients who would benefit from antiretroviral therapy. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. USN HOSP,DEPT LAB,SAN DIEGO,CA 92134. USN,HLTH RES CTR,DEPT HLTH SCI,SAN DIEGO,CA 92152. USN,HLTH RES CTR,DEPT EPIDEMIOL,DIV EPIDEMIOL,SAN DIEGO,CA 92152. UNIV ARKANSAS,DEPT COMP SYST ENGN,FAYETTEVILLE,AR 72701. RP WEISS, PJ (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. OI Goforth, Reuben/0000-0001-6891-3146 NR 15 TC 21 Z9 21 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 NOV PY 1992 VL 166 IS 5 BP 1149 EP 1153 PG 5 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA JV015 UT WOS:A1992JV01500028 PM 1402028 ER PT J AU PARKS, AD AF PARKS, AD TI THE FERMI AND BOSE CONGRUENCES FOR FREE SEMIGROUPS ON 2 GENERATORS SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article AB Using a free semigroup and a free monoid generated by two symbols, two congruences are introduced. These congruences provide natural equivalence classifications of all finite composite creation and annihilation operators for fermions and bosons such that equivalent operators act identically (to within a nonnegative integer multiple) upon the associated basis states. The resulting quotient structures are shown to be isomorphic to two elementary inverse semigroups and their algebras are used to construct generalized commutation forms. These provide for the easy evaluation of any fermion anticommutator and any reduced word boson commutator. RP PARKS, AD (reprint author), USN,CTR SURFACE WARFARE,DEPT STRATEG SYST,SPACE SCI BRANCH,DAHLGREN,VA 22448, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD NOV PY 1992 VL 33 IS 11 BP 3649 EP 3652 DI 10.1063/1.529911 PG 4 WC Physics, Mathematical SC Physics GA JV628 UT WOS:A1992JV62800003 ER PT J AU NEUPERT, EA LEE, JW PHILPUT, CB GORDON, JR AF NEUPERT, EA LEE, JW PHILPUT, CB GORDON, JR TI EVALUATION OF DEXAMETHASONE FOR REDUCTION OF POSTSURGICAL SEQUELAE OF 3RD MOLAR REMOVAL SO JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY LA English DT Article ID CONTROLLED TRIAL; DOUBLE-BLIND; METHYLPREDNISOLONE; FLURBIPROFEN; PAIN; SUPPRESSION; TRISMUS; PLACEBO; SURGERY; THERAPY C1 USN HOSP,DEPT ORAL & MAXILLOFACIAL SURG,PORTSMOUTH,VA. USN HOSP,DEPT CLIN INVEST,PORTSMOUTH,VA. NR 22 TC 35 Z9 39 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 NOV PY 1992 VL 50 IS 11 BP 1177 EP 1182 DI 10.1016/0278-2391(92)90149-T PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA JW878 UT WOS:A1992JW87800006 PM 1403273 ER PT J AU ROLAND, CM NGAI, KL AF ROLAND, CM NGAI, KL TI SEGMENTAL RELAXATION IN MISCIBLE POLYMER BLENDS SO JOURNAL OF RHEOLOGY LA English DT Article ID CONFORMATIONAL TRANSITIONS; POLYISOPRENE; MISCIBILITY; CHAIN AB Usually the shape of the glass transition dispersion in the mechanical or dielectric spectra of pure polymers is skewed toward higher frequencies. In miscible polymer blends not only is this peak broader than in pure polymers, the broadening is often asymmetric towards lower frequencies. Concentration fluctuations are the obvious source of the broadening; however, a simple distribution of relaxation times, corresponding to a distribution in local compositions, would not account for the reversal in the asymmetry of the dispersion. Miscible blends are also thermorheological complex, with the temperature dependence of segmental relaxation exhibiting idiosyncratic composition dependencies. A model to describe the composition dependence and shape of the relaxation spectra of miscible polymer blends in the glass transition zone is described. The fluctuations in local composition inherent to a miscible blend give rise to a distribution in both the relaxation time and degree of cooperativity of segmental relaxation. Generally, the intermolecular cooperativity will be amplified by a high relative abundance of the component of the blend with the higher glass transition temperature; at least for the blends studied herein, higher T(G) is associated with a stronger capacity for intermolecular coupling of the segments. At fixed blend composition this effect governs the shape of the dispersion, as well as being manifested in the composition dependence of the segmental relaxation time. Since the response at lower frequency reflects the contribution of segments residing in regions richer in the high T(G) component, it is anticipated that the glass transition dispersion in miscible blends will be asymmetrically broadened towards lower frequencies. Application of the model to some miscible blends, including poly(vinylethylene)/polyisoprene, polyvinylmethylether/polystyrene, and tetramethyl polycarbonate/polystyrene), is demonstrated to successfully describe their most prominent features. RP ROLAND, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 52 Z9 52 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0148-6055 J9 J RHEOL JI J. Rheol. PD NOV PY 1992 VL 36 IS 8 BP 1691 EP 1706 DI 10.1122/1.550280 PG 16 WC Mechanics SC Mechanics GA JY213 UT WOS:A1992JY21300015 ER PT J AU DECREDICO, MA AF DECREDICO, MA TI THE CONFEDERATE REGULAR ARMY - WEINERT,RP SO JOURNAL OF SOUTHERN HISTORY LA English DT Book Review RP DECREDICO, MA (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SOUTHERN HISTORICAL ASSN PI ATHENS PA UNIV GEORGIA HISTORY DEPT, ATHENS, GA 30602 SN 0022-4642 J9 J SOUTHERN HIST JI J. South. Hist. PD NOV PY 1992 VL 58 IS 4 BP 727 EP 728 DI 10.2307/2210820 PG 2 WC History SC History GA KA956 UT WOS:A1992KA95600035 ER PT J AU JONES, HN AF JONES, HN TI AN EVALUATION OF THE IMPRESSION TEST FOR ESTIMATING THE TENSILE PROPERTIES OF METALLIC MATERIALS SO JOURNAL OF TESTING AND EVALUATION LA English DT Article DE IMPRESSION TEST; HARDNESS TEST; TENSION TEST; TENSILE INSTABILITY; TENSILE DUCTILITY; TENSILE YIELD; TRUE TENSILE STRENGTH AB The load versus displacement response of a flat-ended cylindrical indenter when pushed into a material at a constant displacement rate, termed the "impression test," and originally used as a measure of the compressive flow curve of metals, has also been used for estimating the tensile properties of metallic materials. The validity of this test method for determining tensile properties has been studied for five different materials of widely differing tensile flow behaviors. It is demonstrated that the impression test, like all indentation or hardness tests, can be used for the estimation of tensile properties of metallic materials only under very restrictive circumstances. In particular, the test cannot be relied upon alone without calibration and verification by actual tension tests, as it is insensitive to variations in tensile ductility. It was possible, with empirically defined relationships, to obtain reasonable estimates of the tensile yield stress for most of the materials studied. For true tensile strengths of metallic materials the method was less successful. In the case of heterogeneous materials of limited tensile ductility, such as gray cast iron or some particulate reinforced metal matrix composites, the test failed to give a valid characterization of tensile properties. Additionally, it was found to be insensitive to the upper and lower yield point associated with the initiation and propagation of a Luders band which is commonly observed in annealed low-carbon steels. RP JONES, HN (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 9 TC 2 Z9 2 U1 1 U2 2 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 NOV PY 1992 VL 20 IS 6 BP 403 EP 407 PG 5 WC Materials Science, Characterization & Testing SC Materials Science GA JZ535 UT WOS:A1992JZ53500003 ER PT J AU COLLINS, MD KUPERMAN, WA SCHMIDT, H AF COLLINS, MD KUPERMAN, WA SCHMIDT, H TI NONLINEAR INVERSION FOR OCEAN-BOTTOM PROPERTIES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ABSORBING BOUNDARY-CONDITIONS; SHALLOW-WATER; ACOUSTIC PROPAGATION; SOURCE LOCALIZATION; WAVEGUIDE; MIGRATION; NOISE AB High-resolution methods based on simulated annealing and full-wave sound propagation models are developed for nonlinear inversion for ocean-bottom properties. Simulated annealing is used to search the high-dimensional parameter space of ocean bottoms for the parameter set corresponding to the best replica field. The parabolic equation method is used to solve range-dependent inversion problems. For data taken by Lynch et al. from a range-dependent region of the Gulf of Mexico [J. Acoust. Soc. Am. 89, 648-665 (1991)], this approach achieves excellent agreement between the theoretical and measured acoustic pressures. The recovered sediment parameters suggest that a sound-speed boundary layer exists in the upper part of the sediment and that the depth of an interface in the sediment is range dependent. For locally range-independent problems, inversion is performed in wave-number space. Large efficiency gains are possible with this approach because the number of wave-number samples required for inversion is much smaller than the number of wave-number samples required for computing replica fields. C1 MIT,CAMBRIDGE,MA 02139. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 31 TC 156 Z9 163 U1 1 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 NOV PY 1992 VL 92 IS 5 BP 2770 EP 2783 DI 10.1121/1.404394 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JX919 UT WOS:A1992JX91900029 ER PT J AU LUDECKE, FG AF LUDECKE, FG TI DE-DOPPLERIZATION OF UNDERWATER ACOUSTIC DATA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SIGNALS; NOISE AB This paper describes both an approximate and an exact method to remove the Doppler shift from underwater acoustic data. The approximate method can, be applied to Doppler shifts of arbitrary time dependence. Calculational constraints currently limit the exact method to Doppler shifts that have either a constant or a linear time dependence. The accuracy of the results produced by both methods differ only minimally. The technique used by the methods to achieve de-Dopplerization involves working with the phase of the received signal. The implementation of these methods in a signal processing system that de-Dopplerizes using a variable sampling frequency is described; both a hardware and a software implementation of the methods are discussed. Results of tests conducted with both simulated and actual field data show that the methods correct for Doppler effectively. RP LUDECKE, FG (reprint author), USN,CTR UNDERSEA WARFARE,DIV NEWPORT,CODE 3823,NEWPORT,RI 02841, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1992 VL 92 IS 5 BP 2813 EP 2822 DI 10.1121/1.404397 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JX919 UT WOS:A1992JX91900033 ER PT J AU ATCHLEY, AA AF ATCHLEY, AA TI STANDING WAVE ANALYSIS OF A THERMOACOUSTIC PRIME MOVER BELOW ONSET OF SELF-OSCILLATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB A standing wave analysis of a thermoacoustic prime mover is presented. The analysis, motivated by Swift [ G. W. Swift, "Thermoacoustic engines," J. Acoust. Soc. Am. 84, 1145-1180 (1988) ], assumes that the acoustic pressure and velocity can be described in terms of a standing wave throughout the prime mover. Because the analysis is not limited by either the small boundary layer or short stack approximations, it is more general than Swift's short stack, boundary layer approach. However, it is not as general as a fully numerical approach. The results of the analysis compare well to measurements of the quality factor of the first three longitudinal modes of a helium-filled prime mover below onset of self-oscillation. An analysis is presented of the sensitivity of the calculations to experimental errors and to various assumptions regarding the temperature distribution in the prime mover stack. It is concluded that, in most cases, using reasonable, simplifying assumptions regarding the temperature distribution produces acceptable results. RP ATCHLEY, AA (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 5 TC 29 Z9 30 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 NOV PY 1992 VL 92 IS 5 BP 2907 EP 2914 DI 10.1121/1.404355 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JX919 UT WOS:A1992JX91900043 ER PT J AU VASUDEVAN, N SHAKER, AW AF VASUDEVAN, N SHAKER, AW TI ACOUSTIC-EMISSION FROM A NUCLEATING POINT FRACTURE IN A COMPOSITE PLATE .1. THEORY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB A symmetric cross-ply laminated sheet in a state of plane stress is considered. The mathematical equations that describe this can be interpreted as the elastodynamic equations for a homogeneous anisotropic thin plate. The source of acoustic emission is taken in the first instance to be a point force and in the second instance to be a point explosion with a given pressure-time relationship. In the third example an infinitesimal shear dislocation with a prescribed slip direction and time dependence is considered. Expressions are developed for the in-plane displacement field in the frequency domain. These expressions for the frequency spectra appear as proper finite integrals. Starting from these asymptotic estimates for both the near and far fields are also developed. The normal displacement is seen as a Poisson effect resulting from the in-plane deformations. Numerical results are presented to show the variation of the P and S wave numbers with respect to direction. Furthermore the location of stationary points for the purposes of asymptotic evaluation is graphically displayed. An interesting result is the occurrence of second-order stationary points in the propagation of S waves. In Part II of this two part paper we will present numerical results for the displacement field due to the various source types discussed here. It is hoped that these results will assist in the ultrasonic nondestructive evaluation of composite plates to monitor the occurrence of quasistatic crack growth. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. RP VASUDEVAN, N (reprint author), RUTGERS STATE UNIV,DEPT MECH & AEROSP ENGN,PISCATAWAY,NJ 08855, USA. NR 10 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 NOV PY 1992 VL 92 IS 5 BP 2964 EP 2976 DI 10.1121/1.404361 PG 13 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JX919 UT WOS:A1992JX91900050 ER PT J AU MILLER, JH CHIU, CS AF MILLER, JH CHIU, CS TI LOCALIZATION OF THE SOURCES OF SHORT DURATION ACOUSTIC-SIGNALS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB A time-domain method to localize the source of a short duration acoustic signal in a realistic, range-dependent ocean environment is presented. The method involves the use of a time domain propagation model and a correlation procedure. The viability of the technique is demonstrated in a computer experiment. The experiment simulated localization performance in a coastal environment. The results from the experiment suggest the promise of the technique. RP MILLER, JH (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. OI Miller, James H./0000-0001-7156-3589 NR 5 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1992 VL 92 IS 5 BP 2997 EP 2999 DI 10.1121/1.404369 PG 3 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JX919 UT WOS:A1992JX91900058 ER PT J AU DUTTA, I MITRA, S RABENBERG, L AF DUTTA, I MITRA, S RABENBERG, L TI OXIDATION OF SINTERED ALUMINUM NITRIDE AT NEAR-AMBIENT TEMPERATURES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID AIN AB Oxidation of sintered aluminum nitride at low temperatures (20-degrees-200-degrees-C) was studied using transmission electron microscopy (TEM). Particles of alpha-Al2O3, about 20-30 angstrom in size, were found to form within minutes on freshly cleaned surfaces of AlN at room temperature. The oxide was found to grow nearly epitaxially on AlN when the {0001}AlN planes were exposed to the surface. Limited nonepitaxial oxidation was also observed when the basal planes were inclined to the TEM foil surface. After 10 h in air at 75-degrees-C, the particles coarsened to about 50 angstrom while after 150 h at 200-degrees-C, an oxide film, about 500 angstrom thick, was observed on some grains. C1 UNIV TEXAS,CTR MAT SCI & ENGN,AUSTIN,TX 78712. RP DUTTA, I (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 16 TC 18 Z9 18 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD NOV PY 1992 VL 75 IS 11 BP 3149 EP 3153 DI 10.1111/j.1151-2916.1992.tb04403.x PG 5 WC Materials Science, Ceramics SC Materials Science GA JX136 UT WOS:A1992JX13600040 ER PT J AU WILLOUGHBY, HE AF WILLOUGHBY, HE TI LINEAR MOTION OF A SHALLOW-WATER BAROTROPIC VORTEX AS AN INITIAL-VALUE PROBLEM SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID TROPICAL-CYCLONE MOTION; BETA-PLANE; MODEL; ASYMMETRIES AB This paper revisits calculation of motion for a shallow-water barotropic vortex with fixed mean axisymmetric structure. The algorithm marches the linear primitive equations for the wavenumber 1 asymmetry forward in time using a vortex motion extrapolated from previous calculations. Periodically, it examines the calculated asymmetry for the apparent asymmetry due to mispositioning of the vortex center, repositions the vortex to remove the apparent asymmetry, and passes the corrected vortex motion on to the next cycle. This approach differs from the author's earlier variational determination of the steady-state motion after initial transients had died away. The steady-state approach demonstrated that the vortex had normal modes at zero frequency and, when an annulus of weak anticyclonic flow encircled the cyclonic inner vortex, at the most anticyclonic rotation frequency of the mean flow. Forcing of the former model led to too rapid steady-state poleward motion on a beta plane. At least for the linear problem, the key to more realistic simulation of motion and structure is the normal modes' transient response to diverse forcing: environmental potential vorticity gradients, embedded sources and sinks of mass, and initial asymmetries. The beta effect and other environmental potential vorticity gradients excite the normal modes to induce an acceleration of the vortex center toward and to the left of the direction to maximum environmental vorticity. Times approximately 100 days would be required to reach the too fast motions predicted in the earlier work. A rotating mass source-sink pair drives the vortex along a cycloidal track, but does not force the normal modes. A nonrotating source-sink forces a motion from the source toward the sink and excites the normal modes, leading to motion that persists after the forcing has ceased. Similarly, initial asymmetries that project onto the normal modes maintain themselves for times greater-than-or-equal-to 10 days, leading to persistent vortex propagation that evolves as the complex normal-mode frequencies dictate. Understanding of these normal modes can contribute to better tropical cyclone motion forecasts through better initialization of numerical track prediction models. C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. RP WILLOUGHBY, HE (reprint author), NOAA,ATLANTIC OCEANOG & METEOROL,DIV HURRICANE RES,CORAL GABLES,FL 33146, USA. NR 30 TC 51 Z9 53 U1 0 U2 1 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 NOV 1 PY 1992 VL 49 IS 21 BP 2015 EP 2031 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JV903 UT WOS:A1992JV90300005 ER PT J AU SEARSON, PC MACAULAY, JM PROKES, SM AF SEARSON, PC MACAULAY, JM PROKES, SM TI THE FORMATION, MORPHOLOGY, AND OPTICAL-PROPERTIES OF POROUS SILICON STRUCTURES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Review ID TRANSMISSION ELECTRON-MICROSCOPY; CONTROLLED CLUSTER FORMATION; ANODIC-DISSOLUTION; HF SOLUTION; FORMATION MECHANISM; LIGHT-EMISSION; LAYERS; PHOTOLUMINESCENCE; MICROSTRUCTURE; DIFFRACTION AB The recent demonstrations of visible light emission from porous silicon, both photoluminescence and electroluminescence, have caught the attention of the semiconductor research community. Such silicon-based light emitting devices have considerable potential in the opto-electronics industry. This article reviews the present understanding of the electrochemistry of pore formation, the structure, and the light emitting properties of porous silicon. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. USN,RES LAB,WASHINGTON,DC 20375. RP SEARSON, PC (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. RI Searson, Peter /A-3311-2010; OI Searson, Peter/0000-0002-5417-0828 NR 79 TC 110 Z9 111 U1 1 U2 10 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 NOV PY 1992 VL 139 IS 11 BP 3373 EP 3378 DI 10.1149/1.2069080 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JX172 UT WOS:A1992JX17200061 ER PT J AU RASLEAR, TG SHURTLEFF, D SIMMONS, L AF RASLEAR, TG SHURTLEFF, D SIMMONS, L TI INTERTRIAL-INTERVAL EFFECTS ON SENSITIVITY (A') AND RESPONSE BIAS (B'') IN A TEMPORAL DISCRIMINATION BY RATS SO JOURNAL OF THE EXPERIMENTAL ANALYSIS OF BEHAVIOR LA English DT Article DE TIME DISCRIMINATION; INTERTRIAL INTERVAL; SIGNAL DETECTION; RESPONSE BIAS; LEVER PRESSING; RATS ID BISECTION AB Killeen and Fetterman's (1988) behavioral theory of animal timing predicts that decreases in the rate of reinforcement should produce decreases in the sensitivity (A') of temporal discriminations and a decrease in miss and correct rejection rates (decrease in bias toward "long" responses). Eight rats were trained on a 10- versus 0.1-s temporal discrimination with an intertrial interval of 5 s and were subsequently tested on probe days on the same discrimination with intertrial intervals of 1, 2.5, 5, 10, or 20 s. The rate of reinforcement declined for all animals as intertrial interval increased. Although sensitivity (A') decreased with increasing intertrial interval, all rats showed an increase in bias to make long responses. C1 USN,MED RES INST,WASHINGTON,DC 20350. RP RASLEAR, TG (reprint author), WALTER REED ARMY INST RES,DEPT MICROWAVE RES,WASHINGTON,DC 20307, USA. NR 11 TC 18 Z9 18 U1 0 U2 0 PU SOC EXP ANALYSIS BEHAVIOR INC PI BLOOMINGTON PA INDIANA UNIV DEPT PSYCHOLOGY, BLOOMINGTON, IN 47405 SN 0022-5002 J9 J EXP ANAL BEHAV JI J. Exp. Anal. Behav. PD NOV PY 1992 VL 58 IS 3 BP 527 EP 535 DI 10.1901/jeab.1992.58-527 PG 9 WC Psychology, Biological; Behavioral Sciences; Psychology, Experimental SC Psychology; Behavioral Sciences GA JY196 UT WOS:A1992JY19600010 PM 1447544 ER PT J AU LAPOTA, D YOUNG, DK BERNSTEIN, SA GEIGER, ML HUDDELL, HD CASE, JF AF LAPOTA, D YOUNG, DK BERNSTEIN, SA GEIGER, ML HUDDELL, HD CASE, JF TI DIEL BIOLUMINESCENCE IN HETEROTROPHIC AND PHOTOSYNTHETIC MARINE DINOFLAGELLATES IN AN ARCTIC FJORD SO JOURNAL OF THE MARINE BIOLOGICAL ASSOCIATION OF THE UNITED KINGDOM LA English DT Article ID PLANKTONIC BIOLUMINESCENCE; SEA AB Oceanic and coastal bioluminescence in surface waters, in many instances, is produced by microscopic dinoflagellates. Their light emission is usually observed at a maximum during the night hours and markedly inhibited during the day. This diel periodicity has never been observed in situ for identified species and never before in heterotrophic Protoperidinium dinoflagellates. Pronounced differences in stimulable bioluminescence measured with bathyphotometers in Vestfjord, Norway in September 1990 correlated with simultaneous ship-board laboratory experiments. Cells of both the photosynthetic Ceratium fusus and heterotrophic Protoperidinium curtipes showed a pronounced inhibition of bioluminescence during the day and maximum bioluminescence at night. C1 USN,DIV OCEANOG,OCEANOG & ATMOSPHER RES LAB,BAY ST LOUIS,MS 39529. UNIV CALIF SANTA BARBARA,INST MARINE SCI,SANTA BARBARA,CA 93106. USN,OCEANOG OFF,BAY ST LOUIS,MS 39529. RP LAPOTA, D (reprint author), USN,CTR OCEAN SYST,MARINE ENVIRONM BRANCH,SAN DIEGO,CA 92152, USA. NR 30 TC 13 Z9 13 U1 0 U2 6 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0025-3154 J9 J MAR BIOL ASSOC UK JI J. Mar. Biol. Assoc. U.K. PD NOV PY 1992 VL 72 IS 4 BP 733 EP 744 PG 12 WC Marine & Freshwater Biology SC Marine & Freshwater Biology GA JZ465 UT WOS:A1992JZ46500001 ER PT J AU DUNCAN, MD MAHON, R TANKERSLEY, LL REINTJES, J AF DUNCAN, MD MAHON, R TANKERSLEY, LL REINTJES, J TI LOW-LIGHT-LEVEL, QUANTUM-NOISE-LIMITED AMPLIFICATION IN A STIMULATED RAMAN AMPLIFIER SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID IMAGE AMPLIFICATION; SCATTERING AB We have investigated the noise characteristics and the low-light-level imaging capabilities of a stimulated Raman amplifier. Diffraction-limited Stokes beams as well as Stokes beams carrying spatial structure have been amplified with a collimated pump with a Fresnel number in the range 3-17. Both direct imaging and Fourier-transform imaging of the Stokes signal through the Raman amplifier were used. Results indicate that approximately 1-4 photons per spatial mode are needed to produce images with a signal-to-noise ratio of 1. Amplification of the Fourier transform of the object effectively provides spatial filtering of the noise and gives the best signal-to-noise ratio at the lowest input levels for our experiments. 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 13 TC 12 Z9 12 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 NOV PY 1992 VL 9 IS 11 BP 2107 EP 2121 DI 10.1364/JOSAB.9.002107 PG 15 WC Optics SC Optics GA JW724 UT WOS:A1992JW72400024 ER PT J AU MATTHEWS, RD NOLAN, JF LIBBYSTRAW, JA SANDS, JP AF MATTHEWS, RD NOLAN, JF LIBBYSTRAW, JA SANDS, JP TI TRANSURETHRAL SURGERY USING INTRAVESICAL BUPIVACAINE AND INTRAVENOUS SEDATION SO JOURNAL OF UROLOGY LA English DT Article DE ANESTHESIA; ANESTHESIA ADJUVANTS; BUPIVACAINE; FENTANYL; SURGERY AB We report our experience using intravesical 0.5% bupivacaine as a topical anesthetic along with intravenous fentanyl and midazolam sedation to perform a variety of transurethral procedures in 78 patients. We achieved adequate pain control in all patients and observed no anesthetic complications. Use of this combination of intravesical topical anesthesia and intravenous sedation provided safe, adequate anesthesia to our patients undergoing various transurethral procedures in an outpatient clinic setting. C1 USN HOSP,DEPT UROL,SAN DIEGO,CA 92134. RP MATTHEWS, RD (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 2 TC 10 Z9 10 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD NOV PY 1992 VL 148 IS 5 BP 1475 EP 1476 PG 2 WC Urology & Nephrology SC Urology & Nephrology GA JW460 UT WOS:A1992JW46000034 PM 1433550 ER PT J AU MALAFSKY, GP FU, SS HSU, DSY AF MALAFSKY, GP FU, SS HSU, DSY TI PHOTOEMISSION OF ADSORBED XENON STUDY OF SURFACE-DEFECTS GENERATED BY ION-BOMBARDMENT OF NI(111) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID METAL-SURFACES; INVERSE PHOTOEMISSION; ADSORPTION; PT(111); MULTILAYERS; ATOMS; LAYERS AB The surface defect density generated by 1.0 keV Ar+ ion bombardment of a Ni(111) crystal at 88 K is studied with photoemission of adsorbed xenon. (PAX). The defect sites are distinguished by the position of the Xe 3d5/2 peak. The peak position reflects the local electrostatic potential at the Xe adsorption site that is modified at a defect site from the terrace sites by the electron-density smoothing process. The PAX spectra of the ion bombarded surfaces have peaks at 669.3 eV from Xe adsorbed at terrace sites, 670.0 eV from Xe at step sites, and 671.0 eV. We ascribe the latter peak to Xe adsorbed at small vacancy islands or kink sites where the Xe atom can experience a larger electrostatic potential perturbation compared to Xe adsorbed at a step site producing the additional 1 eV shift to higher binding energy. The PAX spectra are acquired with two ambient Xe pressures, 7 X 10(-10) and 5 X 10(-6) Torr. At low Xe pressure, the total Xe coverage and step peak intensity rapidly increase with low ion fluence with initial rates of 3 Xe atoms/ion for the total Xe coverage and 1. 5 Xe atoms/ion for the step sites in the first 2.9 X 10(13) ions/cm2 fluence. In contrast, at high Xe pressure, the total Xe coverage, and the terrace peak intensity decrease rapidly in the same region of ion fluence with initial rates of - 3 Xe atoms/ion for the total Xe coverage and - 5 Xe atoms/ion for the terrace peak. The rate of decrease of the terrace peak intensity corresponds to 15 Ni terrace atoms uncovered per incident ion since the large Xe atom covers three terrace atoms. The loss of Xe coverage on terrace sites likely results from the destruction of the long-range order in the Xe two-dimensional solid on the ion bombardment roughened surface. RP MALAFSKY, GP (reprint author), USN,RES LAB,DIV CHEM,CODE 6114,WASHINGTON,DC 20375, USA. NR 40 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 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD NOV-DEC PY 1992 VL 10 IS 6 BP 3472 EP 3477 DI 10.1116/1.577805 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JX920 UT WOS:A1992JX92000016 ER PT J AU BERMUDEZ, VM AF BERMUDEZ, VM TI STUDY OF FLUORINE (XEF2) ADSORPTION AND OF OXYGEN FLUORINE COADSORPTION ON SILICON USING INFRARED REFLECTION ABSORPTION-SPECTROSCOPY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID PHOTON-STIMULATED DESORPTION; INITIAL-STAGES; CHEMI-LUMINESCENCE; MOLECULAR FLUORINE; F-ATOMS; SI-F; SURFACES; PRODUCTS; SPECTRA; SI(100) AB Infrared reflection absorption spectroscopy has been used to study the chemisorption of fluorine (by exposure to XeF2) on polycrystalline Si surfaces in ultrahigh vacuum and under low-pressure steady-state conditions. Adsorption at 300 K leads to the sequential formation of mono-, di-, and trifluoride SiFx groups. Annealing at successively higher temperature forms more =SiF by decomposition of =SiF2 and -SiF3. After a 770 K anneal, only the 890 cm-1 =SiF band remains and is removed by F desorption at approximately 820 K. Similar results are obtained in a continuous XeF2 flux With, in addition, the appearance near 300 K of a weak feature possibly due to adsorbed SiF4. Based in par-t on these results, an estimate can be made of the rate-limiting step in the reaction. In the high-temperature limit (T > 650 K) it appears to be the conversion of =SiF to =SiF2; whereas, near 300 K, it is the formation of SiF4 from -SiF3. The effects on fluorination of pre- and postexposure to O2 have also been observed. Preadsorbed O stabilizes F, shifting the F desorption temperature higher by at least 100 K. In the presence of coadsorbed F, the Si-O-Si antisymmetric stretch appears at 1150 cm-1, significantly higher than on a similar, F-free surface. Preadsorbed F impedes subsequent chemisorption of O2, and the O that is adsorbed has no apparent effect on SiFx bonding as reflected in the Si-F stretching vibrations. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 66 TC 41 Z9 41 U1 0 U2 3 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 NOV-DEC PY 1992 VL 10 IS 6 BP 3478 EP 3485 DI 10.1116/1.577806 PG 8 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JX920 UT WOS:A1992JX92000017 ER PT J AU MARRIAN, CRK DOBISZ, EA DAGATA, JA AF MARRIAN, CRK DOBISZ, EA DAGATA, JA TI ELECTRON-BEAM LITHOGRAPHY WITH THE SCANNING TUNNELING MICROSCOPE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 36TH ANNUAL INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 26-29, 1992 CL ORLANDO, FL SP AMER VACCUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER, HUGHES RES LABS ID RESIST AB The scanning tunneling microscope (STM), operated in vacuum in the field emission mode, has been used in lithographic studies of the resist SAL-601 from Shipley. Patterns have been written by raising the tip-sample voltage above -12 V while operating the STM in the constant current mode. Resist films, 50 nm thick, have been patterned and the pattern transferred into the GaAs substrate by reactive ion etching. The variation of feature size with applied dose and tip-sample bias voltage has been studied. Comparisons have been made to lithography with a 10 nm, 50 kV electron e-beam in a JEOL JBX-5DII in the same resist thickness films. In all cases the resist films were processed in the standard fashion before and after exposure. The STM can write smaller minimum features sizes and has a greater process latitude. Proximity effects are absent due to the reduced scattering range of the low energy primary electrons. However, the writing speed is slower, being limited by the response of the piezoelectric scanner. Advances have been made recently in the construction of fast STMs which scan at video rates making the STM comparable in speed to the JEOL for nanolithography. The development of ultralow voltage e-beam lithography based on STM technology is discussed. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP MARRIAN, CRK (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6864,WASHINGTON,DC 20375, USA. NR 14 TC 67 Z9 67 U1 0 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1992 VL 10 IS 6 BP 2877 EP 2881 DI 10.1116/1.585978 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA KM500 UT WOS:A1992KM50000102 ER PT J AU GHANBARI, RA BURKHARDT, M ANTONIADIS, DA SMITH, HI MELLOCH, MR RHEE, KW PECKERAR, MC AF GHANBARI, RA BURKHARDT, M ANTONIADIS, DA SMITH, HI MELLOCH, MR RHEE, KW PECKERAR, MC TI COMPARATIVE MOBILITY DEGRADATION IN MODULATION-DOPED GAAS DEVICES AFTER E-BEAM AND X-RAY-IRRADIATION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 36TH ANNUAL INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 26-29, 1992 CL ORLANDO, FL SP AMER VACCUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER, HUGHES RES LABS ID MAGNETOTRANSPORT CHARACTERIZATION; ALGAAS HETEROSTRUCTURES; ELECTRON-IRRADIATION; INDUCED DAMAGE; SUBTHRESHOLD; DEFECTS AB We report on measured Hall mobility versus temperature for high-quality modulation-doped AlGaAs/GaAs samples after exposure by electrons and x rays at doses and energies typically used in lithography. We find that bare samples exposed by 50 keV electrons suffered significant mobility degradation over the temperature range of 4.2-300 K (as much as a factor of 30). X-ray-exposed samples did not show any mobility degradation. Two-dimensional electron densities were not dramatically affected by either exposure technique, although e-beam exposed samples did show a slight decrease in carrier density. Our results are consistent with previous reports of mobility degradation in some e-beam evaporators. C1 PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907. USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. RP GHANBARI, RA (reprint author), MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139, USA. NR 14 TC 5 Z9 5 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1992 VL 10 IS 6 BP 2890 EP 2892 DI 10.1116/1.585981 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA KM500 UT WOS:A1992KM50000105 ER PT J AU DELAHOUSSAYE, PR OFFORD, BW MINTER, JP IMTHURN, GP GARCIA, GA AF DELAHOUSSAYE, PR OFFORD, BW MINTER, JP IMTHURN, GP GARCIA, GA TI FABRICATION OF N-CHANNEL METAL-OXIDE SEMICONDUCTOR FIELD-EFFECT TRANSISTORS WITH 0.2 MU-M GATE LENGTHS IN 500 ANGSTROM THIN-FILM SILICON ON SAPPHIRE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 36TH ANNUAL INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 26-29, 1992 CL ORLANDO, FL SP AMER VACCUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER, HUGHES RES LABS ID 100 NM; MOSFETS; SOS AB n-Channel metal-oxide-semiconductor field-effect transistors with gate lengths ranging from 10-0.2 mum were fabricated for the first time on device quality 300-500 angstrom ultrathin silicon on sapphire (SOS) wafers using electron-beam exposure for the gate level patterning step. Working devices were found over a large area on a group of six 4 in. wafers, including two wafers with approximately 1000 angstrom thick silicon films used for comparison, each with slightly different fabrication conditions. An arsenic implant was used to dope the source-drain regions of the devices. Threshold voltages were measured across each wafer for a variety of gate lengths, from which both an average value and spread was obtained. Both the average value and spread were seen to correlate with the silicon film thickness and thickness variations measured directly. Similar measurements were obtained for subthreshold slopes. Extrinsic transconductance was measured to be as high as 42 mS/mm for the smaller devices, heavily reduced due to source and contact resistance from the doped thin silicon (at about 250 OMEGA/square for the 500 angstrom films) leading up to the channel. Some of the special difficulties of electron-beam patterning on thin-film SOS are addressed. RP DELAHOUSSAYE, PR (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RDT & E,CODE 553,SAN DIEGO,CA 92152, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1992 VL 10 IS 6 BP 2954 EP 2957 DI 10.1116/1.585950 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA KM500 UT WOS:A1992KM50000120 ER PT J AU CHU, W EUGSTER, CC MOEL, A MOON, EE DELALAMO, JA SCHATTENBURG, ML RHEE, KW PECKERAR, MC MELLOCH, MR AF CHU, W EUGSTER, CC MOEL, A MOON, EE DELALAMO, JA SCHATTENBURG, ML RHEE, KW PECKERAR, MC MELLOCH, MR TI CONDUCTANCE QUANTIZATION IN A GAAS ELECTRON WAVE-GUIDE DEVICE FABRICATED BY X-RAY-LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 36TH ANNUAL INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 26-29, 1992 CL ORLANDO, FL SP AMER VACCUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER, HUGHES RES LABS ID ONE-DIMENSIONAL TRANSPORT; QUANTUM WIRES; MASKS AB We report on the fabrication of AlGaAs/GaAs split-gate electron waveguide devices of lengths between 0.1 and 2 mum using x-ray lithography, and the measurements of these devices at liquid-helium temperatures and up to 15 K. An x-ray mask (parent mask) was fabricated using e-beam lithography and replicated using proximity x-ray lithography (lambda=1.32 nm) to generate a replica (daughter) mask. The daughter mask was then aligned to patterns on a high-mobility AlGaAs/GaAs sample and x ray exposed using a conformable mask fixture. The conductance of the electron waveguides was measured as a function of the split-gate bias. Sharp 2e2/h conductance steps were observed in devices up to 0.75 mum long at T=2 K. The features in the conductance remain visible up to 15 K. C1 MIT,CTR SPACE RES,CAMBRIDGE,MA 02139. USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907. RP CHU, W (reprint author), MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139, USA. NR 15 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1992 VL 10 IS 6 BP 2966 EP 2969 DI 10.1116/1.585953 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA KM500 UT WOS:A1992KM50000123 ER PT J AU RHEE, KW MA, DI PECKERAR, MC GHANBARI, RA SMITH, HI AF RHEE, KW MA, DI PECKERAR, MC GHANBARI, RA SMITH, HI TI PROXIMITY EFFECT REDUCTION IN X-RAY MASK MAKING USING THIN SILICON DIOXIDE LAYERS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 36TH ANNUAL INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 26-29, 1992 CL ORLANDO, FL SP AMER VACCUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER, HUGHES RES LABS ID MONTE-CARLO SIMULATION; ELECTRON-BEAM; ENERGY DISSIPATION AB A novel method is reported for reducing the proximity effect in high-resolution electron beam patterning of high atomic number materials such as tungsten. The method involves interposing a thin (50-400 nm) layer of SiO2 between the resist and the underlying high-Z substrate. Examples are shown in which gratings of 0.2 mum lines with a 0.5 mum period were written without proximity effect compensation. Optimal intermediate layer thickness for the best resolution of the gratings is determined to be 200 nm. A Monte Carlo model of electron scattering including inelastic processes has been implemented to interpret our experimental results. The model presented shows that having the low atomic number SiO2 layer between the resist and the tungsten prevents the fast secondary electrons being generated at the surface of the tungsten from propagating back into the resist, suggesting a mechanism for proximity effect reduction. The results presented here have important practical applications for x-ray mask making. C1 SACH FREEMAN ASSOCIATE INC,LANDOVER,MD 20785. MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. RP RHEE, KW (reprint author), USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375, USA. NR 12 TC 9 Z9 9 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1992 VL 10 IS 6 BP 3062 EP 3066 DI 10.1116/1.585929 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA KM500 UT WOS:A1992KM50000141 ER PT J AU DOBISZ, EA MARRIAN, CRK SHIREY, LM ANCONA, M AF DOBISZ, EA MARRIAN, CRK SHIREY, LM ANCONA, M TI THIN SILICON-NITRIDE FILMS FOR REDUCTION OF LINEWIDTH AND PROXIMITY EFFECTS IN ELECTRON-BEAM LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 36TH ANNUAL INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 26-29, 1992 CL ORLANDO, FL SP AMER VACCUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER, HUGHES RES LABS AB A thin silicon nitride layer (50-300 nm), deposited on a semicoductor substrate, prior to resist deposition, greatly enhances the resist resolution during electron beam lithography. The resolution enhancement was manifested by smaller feature sizes, for a given dose and full resolution of individual array elements at higher doses than on a bare semiconductor substrate. The effect has been observed in 50-100 nm of both SAL-601 and PMMA spun onto silicon nitride coated Si and GaAs substrates. The samples were patterned with a 50 keV, 15 nm diam probe generated by a JEOL JBX-5DII system. Improved resolution was found on two types of silicon nitride film grown by chemical vapor deposition: one deposited at 800-degrees-C on Si and the other deposited at 200-degrees-C on GaAs. Linewidth reductions in SAL-601 of 40% at low doses and an order of magnitude at high doses were observed on silicon nitride coatings of 50-300 nm thickness. In PMMA, the resolution enhancement was less than in SAL-601, with only a 15% linewidth reduction observed at high doses (greater-than-or-equal-to 10 nC/cm). A reduction in proximity effects due to the presence of the nitride layer, is apparent in SAL-601, for array periods of 1 mum and less. Analysis of the results, combined with Monte Carlo simulations and electron microscopy suggests that fast secondary electrons, generated by the substrate are prevented by the silicon nitride layer from exposing the resist. RP DOBISZ, EA (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. RI Shirey, Loretta/B-3164-2013 OI Shirey, Loretta/0000-0003-2600-3405 NR 12 TC 18 Z9 18 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1992 VL 10 IS 6 BP 3067 EP 3071 DI 10.1116/1.585930 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA KM500 UT WOS:A1992KM50000142 ER PT J AU GHANBARI, RA CHU, W MOON, EE BURKHARDT, M YEE, K ANTONIADIS, DA SMITH, HI SCHATTENBURG, ML RHEE, KW BASS, R PECKERAR, MC MELLOCH, MR AF GHANBARI, RA CHU, W MOON, EE BURKHARDT, M YEE, K ANTONIADIS, DA SMITH, HI SCHATTENBURG, ML RHEE, KW BASS, R PECKERAR, MC MELLOCH, MR TI FABRICATION OF PARALLEL QUASI-ONE-DIMENSIONAL WIRES USING A NOVEL CONFORMABLE X-RAY MASK TECHNOLOGY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 36TH ANNUAL INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 26-29, 1992 CL ORLANDO, FL SP AMER VACCUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER, HUGHES RES LABS ID QUANTUM AB We report on the fabrication of quasi-one-dimensional wires on modulation-doped GaAs/AlGaAs using a novel conformable x-ray mask technology which allows us to expose arbitrary sized samples, including samples much smaller than the membrane area, using our laboratory's standard 31 mm-diam silicon-nitride x-ray mask. After optical alignment, the sample and mask are brought into contact electrically, and then loaded into a specially designed cartridge which allows a vacuum to be pulled between mask and substrate. The vacuum causes the x-ray mask to conform around the sample. We find that a vacuum hold down is necessary to allow easy separation of the sample from the mask with minimal risk to both. C1 MIT,CTR SPACE RES,CAMBRIDGE,MA 02139. USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907. RP GHANBARI, RA (reprint author), MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1992 VL 10 IS 6 BP 3196 EP 3199 DI 10.1116/1.585911 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA KM500 UT WOS:A1992KM50000168 ER PT J AU FREEMAN, SB MARKWELL, JK AF FREEMAN, SB MARKWELL, JK TI SUCRALFATE IN ALLEVIATING POST-TONSILLECTOMY PAIN SO LARYNGOSCOPE LA English DT Article AB Tonsillectomy results in severe throat pain, ear pain, and trismus until the exposed and inflamed muscle becomes covered with regenerated mucosa. Sucralfate binds with the fibrinous exudate of duodenal ulcers, forming a protective barrier that promotes healing. If a similar buffer could be created in the tonsillar bed, morbidity may be diminished. A double-blind, randomized study was completed in 34 adult patients to determine whether sucralfate, given four times daily for 10 days as a swish and swallow, would significantly reduce postoperative pain and promote healing and recovery. Sucralfate significantly lowered postoperative throat pain, otalgia, and trismus. Sucralfate is a safe and well-tolerated topical agent that offers significant pain reduction and may promote healing in tonsillectomy patients. C1 USN,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23708. NR 5 TC 39 Z9 39 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 NOV PY 1992 VL 102 IS 11 BP 1242 EP 1246 DI 10.1288/00005537-199211000-00007 PG 5 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA JW251 UT WOS:A1992JW25100007 PM 1405984 ER PT J AU FLIPPEN, LD AF FLIPPEN, LD TI FUNDAMENTAL LAW PRESERVATION IN MODEL-REDUCTION SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article AB A preceding paper [1] provides an abstract setting for the process of mathematically reducing, or simplifying, a complicated mathematical model of a physical system to a more manageable, intelligible model. A model reduction framework is developed in this paper which modifies the formalism of the preceding paper so as to allow, in the model synthesis process, the direct preservation of part of the original, complex model in the reduced model. This revised formalism encompasses the previous formalism as a special case. The revised formalism can be used to guide the development of more specific model reduction methods for those cases for which the preservation, in the reduced model, of the appropriate fundamental laws found in the original model is vital. As a common example, any reduced model in a continuum physics setting should include the universal, material-independent version of the appropriate conservation laws found in the original model if it is to predict responses such that one can still associate a physical intepretation with each response. The revised formalism is given entirely in terms of mappings and the required algebraic properties of these mappings. Since these properties are expressed exclusively in terms of mapping composition, this formalism establishes a very general mathematical foundation for the subject. It is used to outline a possible approach to implementing the model reduction process, based upon trial mappings and norm minimization, for nonlinear problems. The formalism is extended so as to allow a model reduction method developed for systems described in one space (such as physical space), to be utilized for model reduction of systems described in other spaces (such as wave number space). RP FLIPPEN, LD (reprint author), USN,CODE 6380,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 10 TC 3 Z9 3 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD NOV PY 1992 VL 16 IS 11 BP 171 EP 182 DI 10.1016/0895-7177(92)90113-Y PG 12 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA JX529 UT WOS:A1992JX52900014 ER PT J AU HOFFMAN, SL AF HOFFMAN, SL TI DIAGNOSIS, TREATMENT, AND PREVENTION OF MALARIA SO MEDICAL CLINICS OF NORTH AMERICA LA English DT Article ID SEVERE FALCIPARUM-MALARIA; CEREBRAL MALARIA; PLASMODIUM-VIVAX; EXCHANGE-TRANSFUSION; QUININE; CHLOROQUINE; MEFLOQUINE; CHILDREN; PROPHYLAXIS; RESISTANCE RP HOFFMAN, SL (reprint author), USN,MALARIA PROGRAM,BETHESDA,MD 20889, USA. NR 39 TC 35 Z9 35 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0025-7125 J9 MED CLIN N AM JI Med. Clin. N. Am. PD NOV PY 1992 VL 76 IS 6 BP 1327 EP 1355 PG 29 WC Medicine, General & Internal SC General & Internal Medicine GA JT387 UT WOS:A1992JT38700006 PM 1405822 ER PT J AU KORN, DS AF KORN, DS TI EFFECTS OF PHASE NOISE ON ELECTROOPTICAL AND ELECTRONIC SYSTEMS SO MICROWAVE JOURNAL LA English DT Article AB Laser phase noise has a deleterious effect on the bit-error-rate in coherent optical communications. This paper reviews optical communications and includes a comparison between incoherent (direct) defection and coherent (heterodyne) defection. Various aspects of phase noise in coherent optical communications are covered and the sources of phase noise in semiconductor lasers are reviewed. RP KORN, DS (reprint author), USN,RES LAB,DEPT SPACE SYST DEV,SPECIAL PROJECTS OFF,WASHINGTON,DC 20375, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU HORIZON HOUSE-MICROWAVE PI NORWOOD PA 685 CANTON ST, NORWOOD, MA 02062 SN 0192-6225 J9 MICROWAVE J JI Microw. J. PD NOV PY 1992 VL 35 IS 11 BP 67 EP & PG 0 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JZ920 UT WOS:A1992JZ92000002 ER PT J AU HYAMS, KC STRUEWING, JP GRAY, GC AF HYAMS, KC STRUEWING, JP GRAY, GC TI SEROPREVALENCE OF HEPATITIS-A, HEPATITIS-B, AND HEPATITIS-C IN A UNITED-STATES MILITARY RECRUIT POPULATION SO MILITARY MEDICINE LA English DT Article AB One thousand five hundred thirty-eight U.S. Navy and Marine Corps enlisted recruits were tested for hepatitis A, B, and C serologic markers. The recruit population [mean age, 19 years] was 91% male, 69% white, 17% black, 9% Hispanic, 2% Filipino, and 2% "other" racial/ethnic group. Anti-HAV was found in 129 [8.4%] recruits, anti-HBc in 35 [2.3%], HBsAg in 5 [0.3%], and anti-HCV in 4 [0.3%]. For recruits born in the U.S., the prevalence of anti-HAV and anti-HBc was 5.5% and 1.3%, respectively; for the 7% of recruits born outside the U.S., the prevalence was 44.9% and 14.0%, respectively. By logistic regression analysis, seropositivity for hepatitis A and B was independently associated with age, nonwhite racial/ethnic groups, and birth outside of the U.S. This study indicates that there is a relatively low risk of hepatitis A, B, and C infection among Navy and Marine Corps recruits. RP HYAMS, KC (reprint author), USN,MED RES INST,DIV EPIDEMIOL,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. RI Struewing, Jeffery/C-3221-2008; Struewing, Jeffery/I-7502-2013 OI Struewing, Jeffery/0000-0002-4848-3334 NR 0 TC 19 Z9 20 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD NOV PY 1992 VL 157 IS 11 BP 579 EP 582 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA JY325 UT WOS:A1992JY32500012 PM 1470350 ER PT J AU RILEY, T AF RILEY, T TI LAWS OF WAR SO MILITARY MEDICINE LA English DT Letter RP RILEY, T (reprint author), USN,CHEVY CHASE,MD, 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 NOV PY 1992 VL 157 IS 11 BP A5 EP A5 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA JY325 UT WOS:A1992JY32500007 PM 1470344 ER PT J AU DREW, AM AF DREW, AM TI LETTER TO MARIUS,RICHARD IN PRAISE OF HIS BOOK 'THOMAS MORE' SO MOREANA LA English DT Letter RP DREW, AM (reprint author), USN ACAD,DEPT THEORET CHEM,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MOREANA PUBLICATIONS PI ANGERS PA 29, RUE VOLNEY B.P. 808, 49008 ANGERS, FRANCE SN 0047-8105 J9 MOREANA JI Moreana PD NOV PY 1992 VL 29 IS 111-12 BP 166 EP 166 PG 1 WC Medieval & Renaissance Studies SC Arts & Humanities - Other Topics GA KL425 UT WOS:A1992KL42500021 ER PT J AU SCHMIDT, LV AF SCHMIDT, LV TI AN ADAPTIVE FILTER STUDY FOR APPLICATION TO SHIP STEERING MACHINERY SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Recent studies on roll stabilization of ships using a digitally controlled rudder provided an introduction to the wide discrepancy possible in the nonlinear behavior of ship steering machinery. The full potential for use of rudder roll stabilization was not achievable during actual sea trials under these circumstances. An adaptive filter system using a reference model was developed and configured for application to digitally controlled ship steering machinery. Guidelines for establishing the desired performance are described and results of the numerical investigations are presented in this paper. Currently, verification by dockside testing remains to be done. RP SCHMIDT, LV (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT,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 NOV PY 1992 VL 104 IS 6 BP 31 EP 38 PG 8 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA KY944 UT WOS:A1992KY94400001 ER PT J AU HUNDLEY, LL TSAI, SJ AF HUNDLEY, LL TSAI, SJ TI THE USE OF PROPULSION SHAFT TORQUE AND SPEED MEASUREMENTS TO IMPROVE THE LIFE-CYCLE PERFORMANCE OF UNITED-STATES NAVAL SHIPS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper describes the benefits of having permanent torsionmeters installed on the main propulsion shafting of U. S. naval ships. Propulsion shaft torque and speed measurements provide ship operators with accurate knowledge of the ship's powering condition at any given time. This information can be compared with baseline data to reveal degradation in the ship's powering performance. Performance trends produced by observations over an extended period of time can be utilized to forecast the point at which corrective action should be taken. The timely implementation of necessary corrective action can significantly decrease the ship's operating cost by reducing fuel consumption while minimizing excessive wear on the ship's machinery and, in all probability, extend the ship's service life. The value of accurate powering measurements is discussed in conjunction with (1) the accumulation and removal of hull and propeller marine growth, (2) single shaft operation, and (3) ships equipped with controllable pitch propellers. An overview of modern torsionmeters is presented based on literally hundreds of sea trials involving personnel from the Carderock Division. Naval Surface Warfare Center. Development of an overall program is suggested to ensure that (1) only accurate and reliable torsionmeters are installed on U. S. naval ships, (2) the meters are properly maintained and monitored, and (3) full utilization is made of the data obtained and of the baseline data currently available. RP HUNDLEY, LL (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,DEPT HYDROMECH,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 1 U2 2 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD NOV PY 1992 VL 104 IS 6 BP 43 EP 57 PG 15 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA KY944 UT WOS:A1992KY94400003 ER PT J AU WHITE, LC AF WHITE, LC TI ELECTRONIC WARFARE TESTING UTILIZING AN IMPROVED AN/ULM-4 TEST RANGE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Electronic warfare (EW) systems aboard surface ships have become increasingly complex and currently face multiple simultaneous threats. The primary shipboard EW system in the United States Navy is the AN/SLQ-32 system, which is designed to provide detection and active jamming against incoming missile threats. The AN/ULM-4 test range has been utilized to conduct operational readiness testing of this system for many years. Numerous deficiencies of the AN/ULM-4 have been identified and documented. The complexity of current EW systems has demanded that the capabilities of the AN/ULM-4 test range be significantly improved. The redesign of the AN/ULM-4 to correct these deficiencies is presented. This redesign represents a significant increase in test range capability which has been debated and discussed for over ten years. Particular attention is paid to effects certain design constraints had on the decision making process during the course of the redesign. RP WHITE, LC (reprint author), USN,CTR SURFACE WARFARE,CRANE DIV,DEPT SURFACE ELECTR WARFARE SYST,CRANE,IN 47522, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD NOV PY 1992 VL 104 IS 6 BP 58 EP 60 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA KY944 UT WOS:A1992KY94400004 ER PT J AU FERREIRO, LD AF FERREIRO, LD TI THE EFFECTS OF CONFINED WATER OPERATIONS ON SHIP PERFORMANCE - A GUIDE FOR THE PERPLEXED SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Operations in confined waters (both shallow and width-restricted) are quite different from those in the open ocean, and in some ways are more dangerous. This paper acts as a guide to some of these differences, pointing out where the dangers lie, and provides some guidelines for designers and operators to consider. The paper covers the following topics: definition of confined waters; effect on resistance and powering; considerations for ship maneuvering; sinkage and trim effects; ship motions; and other effects. Most of the topics are dealt with in a qualitative manner, but some methods of predicting confined water resistance are presented. RP FERREIRO, LD (reprint author), USN,SEA SYST COMMAND,DIV PRELIMINARY DESIGN SEA501,WASHINGTON,DC 20350, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD NOV PY 1992 VL 104 IS 6 BP 69 EP 83 PG 15 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA KY944 UT WOS:A1992KY94400006 ER PT J AU MOLNAR, DL AF MOLNAR, DL TI WHY ENGINEERS DONT UNDERSTAND LOGISTICS SO NAVAL ENGINEERS JOURNAL LA English DT Note RP MOLNAR, DL (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD NOV PY 1992 VL 104 IS 6 BP 84 EP 85 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA KY944 UT WOS:A1992KY94400007 ER PT J AU PHILLIPS, TE LASHER, ME TRIAS, JA ROBINSON, WR POIRIER, PM DAHLKE, WJ AF PHILLIPS, TE LASHER, ME TRIAS, JA ROBINSON, WR POIRIER, PM DAHLKE, WJ TI 1280X1024 VIDEO RATE LASER-ADDRESSED LIQUID-CRYSTAL LIGHT VALVE COLOR PROJECTION DISPLAY SO OPTICAL ENGINEERING LA English DT Article DE LARGE-SCREEN DISPLAY SYSTEMS; LIQUID CRYSTAL LIGHT VALVES; ACOUSTOOPTIC SCANNERS AB An ali solid-state 1280 x 1024 laser raster scanner (LRS) system conforming to the EIA RS-343 television standard with a limiting resolution of 1300 TV lines has been developed. The laser scanner incorporates acousto-optic devices to perform video modulation and X-Y deflection and is used in a time-multiplexed mode to photoactivate three liquid crystal light valves to project full-color, video-rate, large-screen images. Analysis of the LRS optical system, projection optics, electronics, and light valve characteristics is presented. RP PHILLIPS, TE (reprint author), USN,CTR OCEAN SYST,CODE 414,SAN DIEGO,CA 92152, USA. NR 14 TC 0 Z9 0 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD NOV PY 1992 VL 31 IS 11 BP 2300 EP 2311 DI 10.1117/12.59954 PG 12 WC Optics SC Optics GA JY024 UT WOS:A1992JY02400005 ER PT J AU HISER, SC TRUSTY, GL BLODGETT, JA WELCH, JA ROE, MG COSDEN, TH BENEDICTHALL, G GINAVEN, RO KHAZRA, M ODEEN, E PAGE, JE SWANBERG, NE FEIOCK, FD AF HISER, SC TRUSTY, GL BLODGETT, JA WELCH, JA ROE, MG COSDEN, TH BENEDICTHALL, G GINAVEN, RO KHAZRA, M ODEEN, E PAGE, JE SWANBERG, NE FEIOCK, FD TI SHORT-WAVELENGTH IMAGING LASER-RADAR USING A DIGICON DETECTOR SO OPTICAL ENGINEERING LA English DT Article DE LIDAR; LASER RADAR; LADAR; IMAGING; DIGICON AB A 532-nm direct-detection imaging laser radar using a prototype digicon receiver was constructed and has demonstrated rapid multiple retargeting over a wide field of regard, obtaining single-shot images with intensity and three-dimensional position data for each target. Such laser radar capability is important for discrimination and targeting. The digicon receiver system obtains 8 x 8 pixel images of multiple targets at a rate of 15 Hz. Each image provides both intensity and range-to-target at each pixel. Results of experiments involving seven targets located at various distances along a 60-m light tunnel are presented. Future directions discussed are acquisition and hand-off, tracking, long-range outdoor experiments (approximately 1 km), and a 16 x 16 array digicon tube with magnification. C1 UNIV MARYLAND,RES FDN,GREENBELT,MD 20770. SCI APPLICAT INT CORP,SAN DIEGO,CA 92121. RP HISER, SC (reprint author), USN,RES LAB,CODE 6532,WASHINGTON,DC 20375, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD NOV PY 1992 VL 31 IS 11 BP 2355 EP 2365 DI 10.1117/12.59882 PG 11 WC Optics SC Optics GA JY024 UT WOS:A1992JY02400011 ER PT J AU CARTER, WH AF CARTER, WH TI ON UNWRAPPING 2-DIMENSIONAL PHASE DATA IN CONTOUR MAPS SO OPTICS COMMUNICATIONS LA English DT Article ID FIELD AB A computer algorithm has been discovered for unwrapping two-dimensional phase data and producing perfect contour maps without holes or dark bands of erroneous contour lines. The method employs local, temporary unwrapping within single grid squares of rectangularly sampled data, and the addition of extra contour levels outside of the 0 to 2pi range. RP CARTER, WH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 TC 7 Z9 7 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 1 PY 1992 VL 94 IS 1-3 BP 1 EP 7 DI 10.1016/0030-4018(92)90395-8 PG 7 WC Optics SC Optics GA JT748 UT WOS:A1992JT74800001 ER PT J AU DASGUPTA, A WHITNEY, KG BLAHA, M BUIE, M AF DASGUPTA, A WHITNEY, KG BLAHA, M BUIE, M TI ANALYSIS OF PUMPING MECHANISMS AFFECTING THE GAIN OF THE J=0-1 AND J=2-1 LINES IN NEON-LIKE SELENIUM SO PHYSICAL REVIEW A LA English DT Article ID ELECTRON-IMPACT-EXCITATION; X-RAY LASER; HIGHLY CHARGED IONS; DISTORTED-WAVE APPROXIMATION; F-LIKE SELENIUM; NE-LIKE IONS; DIELECTRONIC-RECOMBINATION; CROSS-SECTIONS; INCIDENT ENERGIES; SE-XXV AB We present collisional-radiative-equilibrium (CRE) gain calculations for the important J = 2-1 and J = 0-1 3p-3s transitions of neonlike selenium using an extensive set of accurate excited-state couplings and self-consistently calculated ionization and excited-state abundances. An atomic model was put together ontaining all the most significant processes impacting the gain calculation of these transitions in order to determine the sensitivity of the gain ratio of the J = 0-1 to the J = 2-1 lines to the monopole excitation cross sections in CRE. It is seen that variations of a factor of 2 or 3 of these cross sections are all that are needed to reverse the calculated J = 0-1 to J = 0-2 pin ratios. For example, a decrease in the direct excitation rate from the ground to the (1/2,1/2)0, 3p level by a factor of 3 is sufficient to reverse the gain ratio for the J = 0-1 line at 182 angstrom to the J = 2-1 line at 210 angstrom and move it into agreement with the experimentally observed ratio for these transitions. Experimental observations would suggest that for low-Z elements (Cu, Zn) this ratio is larger than 1, while for high-Z elements (Mo, Sr) it is less than 1. At issue is where the crossover occurs. We draw attention to another instance where the discrepancy between theoretically calculated behavior and experimental behavior can be attributed to the large size of the calculated monopole excitation rate. We also present the calculated temperature and density behavior of the J = 0-1 and J = 2-1 gains and discuss how this behavior might be used to determine the adequacy of present atomic models to explain experimental neonlike x-ray-laser observations. C1 BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22151. UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109. RP DASGUPTA, A (reprint author), USN,RES LAB,RADIAT HYDRODYNAM BRANCH,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 34 TC 31 Z9 31 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 1 PY 1992 VL 46 IS 9 BP 5973 EP 5984 DI 10.1103/PhysRevA.46.5973 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JX834 UT WOS:A1992JX83400087 ER PT J AU QUONG, AA KLEIN, BM AF QUONG, AA KLEIN, BM TI SELF-CONSISTENT-SCREENING CALCULATION OF INTERATOMIC FORCE-CONSTANTS AND PHONON-DISPERSION CURVES FROM 1ST PRINCIPLES - APPLICATION TO ALUMINUM SO PHYSICAL REVIEW B LA English DT Article ID ABINITIO CALCULATION; ELECTRONIC-STRUCTURE; TOTAL-ENERGY; PSEUDOPOTENTIALS; APPROXIMATION; SOLIDS AB We have developed a method for the calculation of phonon dispersion curves for crystals. The method is based upon linear response theory and makes rio assumptions about the form of the ion-electron interaction or the representation of the wave functions used in the determination of the electronic structure. To demonstrate the accuracy of our method, we present a calculation of the interatomic force constants and the phonon dispersion curves of aluminum from first principles. In this calculation, the bare ion-electron interaction is taken as a nonlocal ab initio pseudopotential. We compare the results of the present method with total-energy frozen phonon results, and with experiment, where the agreement is excellent. RP QUONG, AA (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 33 TC 41 Z9 42 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 1 PY 1992 VL 46 IS 17 BP 10734 EP 10737 DI 10.1103/PhysRevB.46.10734 PG 4 WC Physics, Condensed Matter SC Physics GA JW976 UT WOS:A1992JW97600028 ER PT J AU LIU, AY SINGH, DJ AF LIU, AY SINGH, DJ TI GENERAL-POTENTIAL STUDY OF THE ELECTRONIC AND MAGNETIC-STRUCTURE OF FECO SO PHYSICAL REVIEW B LA English DT Note ID METASTABLE COBALT FILMS; BRILLOUIN-ZONE; SPECIAL POINTS; TOTAL-ENERGY; ALLOYS; IRON; DENSITY; CO; GAAS AB Full-potential calculations of the structural, electronic, and magnetic properties of B2 iron-cobalt are presented. The calculated spin- and charge-density anisotropies are compared to results from neutron-scattering experiments as well as to results from an earlier calculation employing spherical approximations. It is found that the elimination of shape approximations improves agreement with measured anisotropies, but significant discrepancies remain. These discrepancies are attributed to the local-spin-density approximation (LSDA). No significant improvement in the anisotropies is found when the LSDA is replaced by a generalized-gradient-approximation density functional. RP LIU, AY (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012; Liu, Amy/E-2266-2015 OI Liu, Amy/0000-0002-2011-1854 NR 33 TC 28 Z9 28 U1 2 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1992 VL 46 IS 17 BP 11145 EP 11148 DI 10.1103/PhysRevB.46.11145 PG 4 WC Physics, Condensed Matter SC Physics GA JW976 UT WOS:A1992JW97600083 ER PT J AU SINGH, DJ ASHKENAZI, J AF SINGH, DJ ASHKENAZI, J TI MAGNETISM WITH GENERALIZED-GRADIENT-APPROXIMATION DENSITY FUNCTIONALS SO PHYSICAL REVIEW B LA English DT Article ID GROUND-STATE PROPERTIES; ANTI-FERROMAGNETIC CHROMIUM; PLANE-WAVE CALCULATION; 3D TRANSITION-METALS; ELECTRONIC-STRUCTURE; EXCHANGE-ENERGY; BRILLOUIN-ZONE; SPECIAL POINTS; IRON; BCC AB We report generalized-gradient-approximation (GGA) density-functional studies of Cr, V, and Pd, using an all-electron, general-potential linearized-augmented-plane-wave technique. These calculations were undertaken in order to assess the utility of the GGA as an improvement over the local-density approximation in describing transition-metal magnetism. It is found that although the tendency towards magnetism is enhanced, both V and Pd are correctly predicted to be nonmagnetic with the recent GGA functional of Perdew (PW GGA-II) as with the Langreth-Mehl-Hu (LM) functional. Calculations for commensurate antiferromagnetic Cr show that the PW GGA-II predicts an overly large moment of 1.4 mu(B) while the LM functional yields a moment of 0.88 mu(B), which is also larger than experiment. Furthermore the PW GGA-II yields a large magnetic energy for Cr which is difficult to reconcile with the observed spin-density-wave ground state. C1 UNIV MIAMI,DEPT PHYS,CORAL GABLES,FL 33124. RP SINGH, DJ (reprint author), USN,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 63 TC 76 Z9 76 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 NOV 1 PY 1992 VL 46 IS 18 BP 11570 EP 11577 DI 10.1103/PhysRevB.46.11570 PG 8 WC Physics, Condensed Matter SC Physics GA JX929 UT WOS:A1992JX92900031 ER PT J AU MOZURKEWICH, G SALAMON, MB INDERHEES, SE AF MOZURKEWICH, G SALAMON, MB INDERHEES, SE TI CROSSOVER ANALYSIS OF THE HEAT-CAPACITY OF YBA2CU3O7-X NEAR TC - EVIDENCE FOR XY-LIKE CRITICAL-BEHAVIOR SO PHYSICAL REVIEW B LA English DT Article ID DEFICIENT PEROVSKITE BA2YCU3O9-DELTA; CLASSICAL THERMODYNAMIC BEHAVIOR; INCOMMENSURATE PHASE-TRANSITION; SUPERCONDUCTING YBA2CU3O7-X; INPLANE PARACONDUCTIVITY; BULK SUPERCONDUCTIVITY; THERMAL FLUCTUATIONS; II SUPERCONDUCTORS; QUENCHED DISORDER; SINGLE-CRYSTALS AB The heat-capacity anomaly of a largely untwinned single crystal of YBa2Cu307-x is reanalyzed by means of a crossover model. The conventional Gaussian-corrected BCS shape is shown to be inadequate to fit the data within +/-4 K of T(c), a range much larger than estimated from the Ginzburg criterion. Improved fits in the vicinity of T(c) were obtained using the approach of Chen, Albright, and Sengers, who introduced a crossover function to interpolate smoothly between critical and mean-field behavior. The best fit was obtained for the three-dimensional XY model, the expected "intermediate" critical behavior of a superconductor. From the crossover analysis, we estimate the zero-temperture coherence length to be xi0 congruent-to 12 angstrom. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. USN,RES LAB,WASHINGTON,DC 20375. RP MOZURKEWICH, G (reprint author), FORD MOTOR CO,DEARBORN,MI 48121, USA. NR 21 TC 40 Z9 40 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1992 VL 46 IS 18 BP 11914 EP 11918 DI 10.1103/PhysRevB.46.11914 PG 5 WC Physics, Condensed Matter SC Physics GA JX929 UT WOS:A1992JX92900075 ER PT J AU COHN, JL OSOFSKY, MS PENG, JL LI, ZY GREENE, RL AF COHN, JL OSOFSKY, MS PENG, JL LI, ZY GREENE, RL TI INPLANE THERMAL-CONDUCTIVITY OF ND2-XCEXCUO4-Y SO PHYSICAL REVIEW B LA English DT Note ID YBA2CU3O7-DELTA SINGLE-CRYSTALS; CUPRATE AB We present measurements of ab-plane thermal conductivity (kappa) for a series of Nd2-xCexCuO4-y single crystals (x=0.025,0.15,0.22) at T less-than-or-equal-to 300 K. For all specimens kappa increases with decreasing temperature, rises sharply for T < 100 K, and reaches a maximum at T=20-30 K. Near room temperature kappa almost-equal-to 12 W/mK for the insulator (x=0.025) and K almost-equal-to 14-16 W/mK in superconducting (x=0.15) and metallic (x=0.22) specimens. These differences are attributed to differing electronic contributions to heat conduction. No anomaly in kappa(T) was observed at the superconducting transition of the x=0.15 sample. For T < T(c), kappa is suppressed slightly by the application of a strong magnetic field, consistent with an increase in phonon-electron scattering. The kappa data are compared to previous results for the other cuprates. C1 UNIV MARYLAND,CTR SUPERCONDUCT RES,DEPT PHYS,COLL PK,MD 20742. RP COHN, JL (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 20 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1992 VL 46 IS 18 BP 12053 EP 12056 DI 10.1103/PhysRevB.46.12053 PG 4 WC Physics, Condensed Matter SC Physics GA JX929 UT WOS:A1992JX92900100 ER PT J AU LILL, JV BROUGHTON, JQ AF LILL, JV BROUGHTON, JQ TI NONLINEAR MOLECULAR-DYNAMICS AND MONTE-CARLO ALGORITHMS SO PHYSICAL REVIEW B LA English DT Note ID STATISTICAL ENSEMBLES; ANISOTROPIC SOLIDS; SIMULATIONS; TEMPERATURE; TRANSITIONS AB Equations of motion for the molecular dynamics simulation of crystals are presented; the atomic degrees of freedom are coupled to a thermal reservoir to control temperature and to an elastic reservoir to control the deformation of the lattice, while satisfying a nonlinear stress-strain relation. The exact treatment of finite deformations of the lattice leads to a formulation of the tensorial virial theorem that accounts for the elastic response of the crystal to an inclusion of a new structural phase. A Metropolis Monte Carlo algorithm is presented that is completely consistent with the molecular dynamics method; this is achieved by extending the Monte Carlo procedure to include trials of both atomic positions and momenta. Computational results demonstrating the equivalence of the methods in satisfying the virial theorem in the nonlinear regime are presented. RP LILL, JV (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 22 Z9 22 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1992 VL 46 IS 18 BP 12068 EP 12071 DI 10.1103/PhysRevB.46.12068 PG 4 WC Physics, Condensed Matter SC Physics GA JX929 UT WOS:A1992JX92900104 ER PT J AU BOITANO, MA AF BOITANO, MA TI SUBTALAR DISLOCATIONS IN BASKETBALL PLAYERS - POSSIBLE CONTRIBUTING FACTORS SO PHYSICIAN AND SPORTSMEDICINE LA English DT Article AB A US Marine sustained a medial subtalar dislocation while playing basketball in mid-cut tennis shoes. Though such dislocations generally involve high-impact mechanisms, this case supports previous indications of a sports-related mechanism. Generally, conservative treatment involving closed reduction under general anesthesia is adequate, as it was with this patient. Some cases may require surgery. An MRI obtained 8 weeks postinjury revealed possible damage to the articular cartilage of the talus. Preventive strategies may include appropriate shoes, suspended wood floors, and conditioning. RP BOITANO, MA (reprint author), USN ACAD,NAVAL MED CLIN,ANNAPOLIS,MD 21402, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU MCGRAW HILL HEALTHCARE PUBLICATIONS PI MINNEAPOLIS PA 4530 WEST 77TH ST, MINNEAPOLIS, MN 55435-5000 SN 0091-3847 J9 PHYSICIAN SPORTSMED JI Physician Sportsmed. PD NOV PY 1992 VL 20 IS 11 BP 59 EP & PG 0 WC Primary Health Care; Orthopedics; Sport Sciences SC General & Internal Medicine; Orthopedics; Sport Sciences GA JX821 UT WOS:A1992JX82100010 ER PT J AU LAU, YY CHERNIN, D AF LAU, YY CHERNIN, D TI A REVIEW OF THE AC SPACE-CHARGE EFFECT IN ELECTRON CIRCUIT INTERACTIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Review ID TRAVELING-WAVE-TUBE; CYCLOTRON MASER INSTABILITY; AXIAL GUIDE FIELD; STOCHASTIC PARTICLE INSTABILITY; PENIOTRON-LIKE INSTABILITIES; LASER STABILITY PROPERTIES; SIMPLE MACROSCOPIC THEORY; HELICAL MAGNETIC WIGGLER; SELF-CONSISTENT THEORY; GALLERY MODE GYROTRON AB This paper provides a critical examination of traditional theoretical treatments of alternating current (ac) space-charge effects in vacuum electronic devices. By treating several simple examples, it is found that the commonly made decomposition of the first-order field into a "circuit part" and a "space-charge part" is ambiguous and misleading. In at least one case, this terminology has led to a formulation that double counts the effect of space charge in the beam-circuit interaction. In other cases, the "space-charge term" in the dispersion relation-equivalently Pierce's space-charge parameter (QC)-has been improperly or incompletely evaluated. The implications for gyrotrons, peniotrons, free-electron lasers, Smith-Purcell-type generators, and crossed-field devices are addressed. The space-charge effects are briefly discussed in nonlinear theories and in particle simulations. For the models examined, it is found that the most useful and convenient representation for the ac fields is one based on an eigenfunction expansion of the ac magnetic field, even when that field is not itself important to the electron dynamics. C1 USN, RES LAB, DIV PLASMA PHYS, BEAM PHYS BRANCH, WASHINGTON, DC 20375 USA. SCI APPLICAT INT CORP, MCLEAN, VA 22102 USA. NR 239 TC 32 Z9 35 U1 1 U2 9 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1992 VL 4 IS 11 BP 3473 EP 3497 DI 10.1063/1.860356 PG 25 WC Physics, Fluids & Plasmas SC Physics GA JW336 UT WOS:A1992JW33600002 ER PT J AU SWANEKAMP, SB GROSSMANN, JM OTTINGER, PF GEARY, JL AF SWANEKAMP, SB GROSSMANN, JM OTTINGER, PF GEARY, JL TI ONE-DIMENSIONAL SIMULATIONS OF CURRENT-DRIVEN PLASMA SHEATHS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID OPENING SWITCH; DIODE AB A one-dimensional model that treats both electron and ion dynamics with the particle-in-cell method is used to study nonequilibrium electron effects in current-driven plasma sheaths. These simulations show two distinct phases of operation: a low impedance phase, where the diode voltage is small, followed by a phase of rapidly increasing diode voltage and impedance. Early in the low impedance phase, the initial plasma electrons are accelerated toward the anode to conduct the discharge current. Emitted electrons are drawn into the anode-cathode gap by the uncovered positive space charge, leading to the formation of virtual cathodes in the diode. Trapping and heating of the emitted electrons occur as a result of nonequilibrium dynamics in the time-varying virtual cathode potential structure associated with the rising circuit current. The virtual cathode potential structure is characterized by a large potential hill with a large potential drop occurring in the anode sheath. The potential drop in the anode sheath is comparable to the potential rise in the cathode sheath and is responsible for keeping the net diode voltage low during the low impedance phase. The virtual cathode electric field structure accelerates ions toward both electrodes, resulting in a significant depletion of ion charge by the end of the low impedance phase. During the transition to high impedance rapid growth of the cathode sheath is observed. This growth occurs to provide the ions necessary to shield the electric field of the cathode sheath from the bulk plasma. The substantial loss of ions at the anode during the low impedance phase causes the cathode sheath and voltage to grow faster than predicted by quasistatic models. This effect is more pronounced in the higher density simulation, where the loss of ions during the low impedance phase is more significant. C1 BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22151. RP SWANEKAMP, SB (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 17 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1992 VL 4 IS 11 BP 3608 EP 3620 DI 10.1063/1.860369 PG 13 WC Physics, Fluids & Plasmas SC Physics GA JW336 UT WOS:A1992JW33600015 ER PT J AU GANGULY, AK LAU, YY AHN, S AF GANGULY, AK LAU, YY AHN, S TI ABSOLUTE INSTABILITIES IN GYROPENIOTRON AMPLIFIERS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MICROWAVE GENERATION; WAVE; MILLIMETER; TUBE AB The critical current, oscillation frequency, and characteristic wave number for the excitation of absolute instability in gyropeniotron amplifiers are calculated from the linear dispersion relation by following the Briggs-Bers criterion. Numerical results are presented for some cases of interest. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 15 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1992 VL 4 IS 11 BP 3800 EP 3805 DI 10.1063/1.860334 PG 6 WC Physics, Fluids & Plasmas SC Physics GA JW336 UT WOS:A1992JW33600033 ER PT J AU CONWAY, TL CRONAN, TA AF CONWAY, TL CRONAN, TA TI SMOKING, EXERCISE, AND PHYSICAL-FITNESS SO PREVENTIVE MEDICINE LA English DT Article ID ALL-CAUSE MORTALITY; CIGARETTE-SMOKING; BODY-WEIGHT; PERSONNEL; WOMEN C1 SAN DIEGO STATE UNIV,DEPT PSYCHOL,SAN DIEGO,CA 92182. RP CONWAY, TL (reprint author), USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,POB 85122,SAN DIEGO,CA 92186, USA. NR 25 TC 74 Z9 77 U1 1 U2 10 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0091-7435 J9 PREV MED JI Prev. Med. PD NOV PY 1992 VL 21 IS 6 BP 723 EP 734 DI 10.1016/0091-7435(92)90079-W PG 12 WC Public, Environmental & Occupational Health; Medicine, General & Internal SC Public, Environmental & Occupational Health; General & Internal Medicine GA JW800 UT WOS:A1992JW80000005 PM 1438118 ER PT J AU HITNEY, HV AF HITNEY, HV TI WHISPERING GALLERY EFFECTS IN THE TROPOSPHERE SO RADIO SCIENCE LA English DT Article ID PROPAGATION AB Experimental data that recorded higher-than-expected signals at 3087.7 MHz far beyond the horizon in the presence of an elevated duct are examined and compared to results from the radio physical optics (RPO) propagation model. RPO is a range-dependent hybrid model that combines ray optics and parabolic equation methods. Previous modeling of this same case study using waveguide methods for both the measured elevated duct and hypothetical evaporation ducts has been disappointing. However, when the elevated duct is allowed to rise slowly with increasing range, the RPO results closely match the observed signal levels, indicating that weakly attenuated Earth-detached, or whispering gallery, modes were the dominant propagation mechanism. RP HITNEY, HV (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST,SAN DIEGO,CA 92152, USA. NR 11 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 NOV-DEC PY 1992 VL 27 IS 6 BP 893 EP 898 DI 10.1029/92RS01783 PG 6 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA KB002 UT WOS:A1992KB00200011 ER PT J AU GORMAN, JD CHAMPAIGN, JL SUMIDA, FK CANAVAN, L AF GORMAN, JD CHAMPAIGN, JL SUMIDA, FK CANAVAN, L TI SCHISTOSOMIASIS INVOLVING THE BREAST SO RADIOLOGY LA English DT Article DE BREAST, CALCIFICATION; PARASITES; SCHISTOSOMIASIS AB A case of ectopic granulomatous schistosomiasis involving the breast is reported. Although schistosomiasis can involve almost any organ, involvement of the breast is very rare; to the authors' knowledge, there have been only three previously reported cases of breast involvement in the literature. This case was discovered at routine screening mammography. Innumerable, segmentally distributed, fine calcifications and mild architectural distortion were seen at mammography, and a biopsy was performed to exclude malignancy. There appears to be no way to accurately discriminate this disease from breast cancer before biopsy. C1 USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT PATHOL,SAN DIEGO,CA 92134. NR 7 TC 10 Z9 11 U1 0 U2 0 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 SN 0033-8419 J9 RADIOLOGY JI Radiology PD NOV PY 1992 VL 185 IS 2 BP 423 EP 424 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JV360 UT WOS:A1992JV36000021 PM 1410348 ER PT J AU SANTANGELO, PG ROLAND, CM AF SANTANGELO, PG ROLAND, CM TI CHAIN ENDS AND THE MULLINS EFFECT IN RUBBER SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article ID DOUBLE-STEP STRAIN; UNIAXIAL EXTENSION; STRESS-RELAXATION; NETWORK RECOVERY AB It has been suggested that ''Mullins softening'', which is the anomalously low stress found in crosslinked rubbers that have been subjected to a reversing deformation history, might be caused by retraction of the chain ends along their primitive paths. Using natural rubber networks made from precursors of varying molecular weight, and an end-linked polytetrahydrofuran rubber, the fraction of chain ends was varied. From stress-strain relationships measured on these rubbers, it is concluded that Mullins softening is unrelated to the presence of chain ends, or to polydispersity in the lengths of network strands. RP SANTANGELO, PG (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 22 TC 15 Z9 15 U1 0 U2 3 PU AMER CHEMICAL SOC INC PI AKRON PA RUBBER DIV UNIV AKRON PO BOX 499, AKRON, OH 44309-0499 SN 0035-9475 J9 RUBBER CHEM TECHNOL JI Rubber Chem. Technol. PD NOV-DEC PY 1992 VL 65 IS 5 BP 965 EP 972 DI 10.5254/1.3538654 PG 8 WC Polymer Science SC Polymer Science GA KC996 UT WOS:A1992KC99600008 ER PT J AU HARRIS, MJ SHARE, GH BEALL, JH MURPHY, RJ AF HARRIS, MJ SHARE, GH BEALL, JH MURPHY, RJ TI UPPER LIMIT ON THE STEADY EMISSION OF THE 2.223 MEV NEUTRON-CAPTURE GAMMA-RAY LINE FROM THE SUN SO SOLAR PHYSICS LA English DT Article ID GALACTIC-CENTER; SOLAR-FLARES; MICROFLARES AB Data accumulated by the Solar Maximum Mission Gamma Ray Spectrometer (GRS) have been searched for evidence of the 2.223 MeV neutron capture line from the Sun, outside the times of gamma-ray-emitting solar flares. Background-corrected spectra accumulated over 3-day intervals between 1980 and 1989 show no evidence of the line. Upper limits are reported separately for periods of high and low solar activity. A conservative 3sigma upper limit of 5.7 x 10(-5) gamma (cm2 s)-1 is placed on the steady flux in the 2.223 MeV line during inactive periods, which is nearly two orders of magnitude lower than previously published results. After correction for limb darkening of the line emission from off-center positions, this upper limit becomes 7.1 x 10(-5) gamma (cm2 s)-1. Our 3sigma upper limit on the steady flux in the fine during periods of high solar activity is 6.9 x 10(-5) gamma (cm2 s)-1, or 8.6 x 10(-5) gamma (cm2 s)-1 after correction for limb darkening. Our results imply that the quiescent solar corona cannot be heated by ions accelerated above 1 MeV in microflares (or a continuous acceleration process), so long as the ion energy spectrum is similar to that measured in large flares. We also use our results to derive the rate of tritium production at the solar surface; our upper limit of 9 nuclei (cm2 s)-1 is about a factor of 9 below the upper limit from searches for H-3 in the solar wind. We place upper limits of the order 10(33) on the number of energetic (> 30 MeV) protons which can be stored in active regions prior to being released in solar flares, which imply that the strongest observed flares cannot be produced by such a mechanism. C1 USN,RES LAB,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD. ST JOHNS COLL,ANNAPOLIS,MD 21404. RP HARRIS, MJ (reprint author), UNIV SPACE RES ASSOC,WASHINGTON,DC 20024, USA. NR 32 TC 12 Z9 12 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD NOV PY 1992 VL 142 IS 1 BP 171 EP 185 DI 10.1007/BF00156640 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JX667 UT WOS:A1992JX66700012 ER PT J AU WATT, G JOGSAKUL, K LONG, GW AF WATT, G JOGSAKUL, K LONG, GW TI RNA PROBE DETECTION OF PLASMODIUM-FALCIPARUM PARASITEMIA SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Note ID RIBOSOMAL-RNA; MALARIA; DIAGNOSIS C1 USN,MED RES INST,BETHESDA,MD 20814. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,BALTIMORE,MD 21218. RP WATT, G (reprint author), AFRIMS,DEPT MED,APO AP96546,BANGKOK 10400,THAILAND. NR 4 TC 6 Z9 6 U1 0 U2 0 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD NOV-DEC PY 1992 VL 86 IS 6 BP 612 EP 613 DI 10.1016/0035-9203(92)90148-6 PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA KF358 UT WOS:A1992KF35800012 PM 1287913 ER PT J AU CORWIN, A HABIB, M OLSON, J SCOTT, D KSIAZEK, T WATTS, DM AF CORWIN, A HABIB, M OLSON, J SCOTT, D KSIAZEK, T WATTS, DM TI THE PREVALENCE OF ARBOVIRAL, RICKETTSIAL, AND HANTAAN-LIKE VIRAL ANTIBODY AMONG SCHOOLCHILDREN IN THE NILE RIVER DELTA OF EGYPT SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID FEVER; INFECTION; SEROPREVALENCE; POPULATIONS AB A serosurvey was conducted during October and November 1989 to estimate the prevalence of selected arboviral, rickettsial, and Hantaan viral antibody among a sample of schoolchildren from 4 villages in the Bilbeis area of the Nile river delta, Egypt. Blood specimens were obtained from subjects aged 8 to 14 years. Enzyme immunoassay testing of the sera indicated that the prevalence of antibody was 9% (21/223) for Sicilian sandfly fever, 4% (8/223) for Rift Valley fever, 3% (15/437) for West Nile virus and 9% (28/315) for Hantaan (HTN) virus. Antibody was demonstrated among 22% (93/418) of the same study subjects against Coxiella burnetii, 53% (199/373) against Rickettsia typhi, and 37% (137/371) against R. conorii. C1 MINIST HLTH CAIRO,CTR FIELD & APPL RES,CAIRO,EGYPT. USA,MED RES INST INFECT DIS,FREDERICK,MD 21701. RP CORWIN, A (reprint author), USN,MED RES UNIT 3,RES PUBLICAT BRANCH,PSC 452 BOX 5000,FPO AE 09835-0007,CAIRO,EGYPT. NR 23 TC 18 Z9 18 U1 0 U2 1 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD NOV-DEC PY 1992 VL 86 IS 6 BP 677 EP 679 DI 10.1016/0035-9203(92)90189-J PG 3 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA KF358 UT WOS:A1992KF35800046 PM 1363163 ER PT J AU KONNERT, J DANTONIO, P AF KONNERT, J DANTONIO, P TI SIMULATION AND INTERPRETATION OF STEM SIDE-BAND HOLOGRAMS SO ULTRAMICROSCOPY LA English DT Article ID ELECTRON HOLOGRAMS; RESOLUTION AB Simulations of side-band holograms produced with a STEM equipped with a coherent, point electron source and a beam splitter are presented and interpreted. Holograms are calculated for various electron voltages, beam separations and thicknesses of GaAs [110]. The results illustrate features in a hologram associated with a stable, well-adjusted microscope. The simulations also provide data on the dynamic range and resolution necessary for recording the patterns and indicate techniques for removing from the reconstructed images interferences from unscattered beams. RP KONNERT, J (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 9 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD NOV PY 1992 VL 45 IS 3-4 BP 281 EP 290 DI 10.1016/0304-3991(92)90139-B PG 10 WC Microscopy SC Microscopy GA KB675 UT WOS:A1992KB67500002 ER PT J AU MCDERMOTT, JJ DUTKA, AJ KOLLER, WA FLYNN, ET AF MCDERMOTT, JJ DUTKA, AJ KOLLER, WA FLYNN, ET TI EFFECTS OF AN INCREASED PO2 DURING RECOMPRESSION THERAPY FOR THE TREATMENT OF EXPERIMENTAL CEREBRAL ARTERIAL GAS EMBOLISM SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article DE HYPERBARIC OXYGEN; CEREBRAL ISCHEMIA; SOMATOSENSORY EVOKED POTENTIAL; AIR EMBOLISM ID AIR-EMBOLISM; HYPERBARIC-OXYGEN; BLOOD-FLOW; DECOMPRESSION; OCCLUSION; PRESSURE AB In this study we investigated the efficacy of an initial compression to 6 atm abs on a 53% nitrogen:47% oxygen mixture (PO2 = 2.8 atm abs) before breathing oxygen at 2.8 and 1.9 atm abs for the treatment of feline cerebral arterial gas embolism. Neurophysiologic function was determined by measuring the cortical somatosensory evoked potential (SEP) amplitude in anesthetized ventilated cats. Air was infused into the carotid artery until the SEP amplitude was reduced to less than 10% of baseline values. The animals were randomly separated into 3 groups. The first group (CONTROL) (n = 7) served as control and remained at the surface, breathing air. The second group (NITROX) (n = 10) was compressed to 6 atm abs breathing a 53:47% nitrox mixture for 30 min followed by breathing 100% oxygen at 2.8 and 1.9 atm abs. The third group (HBO) (n = 10) was compressed to 2.8 and 1.9 atm abs breathing 100% oxygen. Air infusion suppressed the SEP amplitude to the same level in all groups. The CONTROL group recovered 27.6 +/- 31.2% (mean +/- standard deviation) of the baseline SEP amplitude, whereas the NITROX group recovered 63.2 +/- 28.2%, and the HBO group recovered 66.0 +/- 19.3%. An analysis of variance with repeated measures revealed that both treatment profiles promote significant (P = 0.03) recovery of the SEP amplitude compared to no treatment. We find no additional benefit, however, by initiating treatment at 6 atm abs, even when additional oxygen is provided. C1 NATL NAVAL MED CTR, MED RES & DEV COMMAND, DEPT NEUROL, BETHESDA, MD 20889 USA. RP MCDERMOTT, JJ (reprint author), USN, MED RES INST, DIVING BIOMED TECHNOL FUNCT AREA, BETHESDA, MD 20889 USA. NR 29 TC 24 Z9 24 U1 0 U2 1 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 0093-5387 J9 UNDERSEA BIOMED RES PD NOV PY 1992 VL 19 IS 6 BP 403 EP 412 PG 10 WC Oceanography SC Oceanography GA JY930 UT WOS:A1992JY93000001 PM 1304668 ER PT J AU JENKINS, R GILFRICH, JV AF JENKINS, R GILFRICH, JV TI FIGURES-OF-MERIT, THEIR PHILOSOPHY, DESIGN AND USE SO X-RAY SPECTROMETRY LA English DT Article ID DIFFRACTION AB Figures-of-merit (FOMs) is a term which is used to define the quantitative measure of performance based on parameters which can be determined by the experimentalist. The FOM may be intuitive, based on previous experience of the analyst or his personal assessment of the importance of certain parameters, or derived, based on measurable parameters or on mathematically deduced data, mostly involving statistics. The FOM may also be a combination of intuitive and derived factors. In this review, a number of commonly used FOMs, due to several authors, are considered. They are categorized by their originators, their type (intuitive, derived or a combination thereof), their primary application and the factors on which they are based. The applications discussed include both x-ray spectrometry and x-ray diffraction, but many of the principles apply equally to both. C1 USN,RES LAB,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD 20785. RP JENKINS, R (reprint author), INT CTR DIFFRACT DATA,SWARTHMORE,PA 19081, USA. NR 18 TC 9 Z9 9 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0049-8246 J9 X-RAY SPECTROM JI X-Ray Spectrom. PD NOV-DEC PY 1992 VL 21 IS 6 BP 263 EP 269 DI 10.1002/xrs.1300210603 PG 7 WC Spectroscopy SC Spectroscopy GA KD846 UT WOS:A1992KD84600001 ER PT J AU HAFTEL, MI AF HAFTEL, MI TI MOLECULAR-DYNAMICS OF 300 KEV (D2O)100 CLUSTERS ON TI-D SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article ID IMPACT FUSION; SIMULATION; TRANSPORT; SURFACES; TARGETS; IONS AB We use the molecular dynamics code DAMSEL to predict the velocity distributions for beam and lattice atoms after bombardment of Ti-D "foils" of thickness 20.86 angstrom by 300 keV (D2O)100 Cluster ions. From these distributions we estimate the D-D nuclear fusion yield. We find that cluster bombardment reduces the overall energy deposition of the beam in the lattice compared to that of the individual beam atoms of the same velocity. However, a small portion of lattice atoms (< 1%), and a larger percentage of beam atoms (approximately 30%), have energies above the maximum present in the case of bombardment by individual D or O atoms. The folding of the standard D-D fusion cross sections over the relative velocity distributions produced by beam and lattice deuterons produce a fusion yield estimate of approximately 1 x 10(-21) fusions per cluster, with the high-energy distributions of beam deuterons playing the most important role. This is nine orders of magnitude lower that the data of Beuhler et al. While transient (approximately 10 fs) atom densities 50% higher than that of the initial lattice are recorded in the course of the simulation, the average energy transferred per lattice atom - 23 eV - is insufficient to support any "collision spike" explanation of the observed fusion yield. RP HAFTEL, MI (reprint author), USN,RES LAB,CODE 4651,WASHINGTON,DC 20375, USA. NR 25 TC 2 Z9 2 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD NOV PY 1992 VL 24 IS 4 BP 385 EP 394 PG 10 WC Physics, Atomic, Molecular & Chemical SC Physics GA JX903 UT WOS:A1992JX90300012 ER PT J AU TONUCCI, RJ JUSTUS, BL CAMPILLO, AJ FORD, CE AF TONUCCI, RJ JUSTUS, BL CAMPILLO, AJ FORD, CE TI NANOCHANNEL ARRAY GLASS SO SCIENCE LA English DT Article ID SIZED SEMICONDUCTOR CLUSTERS; OPTICS AB The fabrication and characterization of a glass containing a regular parallel array of submicrometer channels or capillaries are described. The capillaries are arranged in a two-dimensional hexagonal close packing configuration with channel diameters as small as 33 nanometers and packing densities as high as 3 x 10(10) channels per square centimeter. The high-temperature stability of the nanochannel glass array is well suited as a host or template for the formation of quantum confined semiconductor structures or as a mask for massively parallel patterned lithographic applications. C1 VARO INC,NI TEC DIV,GARLAND,TX 75041. RP TONUCCI, RJ (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 20 TC 292 Z9 300 U1 6 U2 55 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD OCT 30 PY 1992 VL 258 IS 5083 BP 783 EP 785 DI 10.1126/science.258.5083.783 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JV692 UT WOS:A1992JV69200031 PM 17777030 ER PT J AU PECKERAR, M REBBERT, M GOPALAKRISHNAN, G AF PECKERAR, M REBBERT, M GOPALAKRISHNAN, G TI APPARENT SUPER RESOLUTION IN HIGH-CONTRAST PHOTORESISTS SO APPLIED PHYSICS LETTERS LA English DT Article ID MODULATORS AB Optoelectronic modulators and couplers frequently require high-aspect ratio feature definition in thick (greater-than-or-equal-to 10 mum) gold. The common process used involves up plating with a photoresist guide. Theory argues that feature boundaries would be degraded due to both diffractive spreading and scattering of the incident light in the resist. This is not observed and near-90-degrees sidewalls appear obtainable. This letter demonstrates this effect and proposes an explanation for it. C1 MARYLAND ADV DEV LAB,GREENBELT,MD 20770. RP PECKERAR, M (reprint author), USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375, USA. NR 7 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 26 PY 1992 VL 61 IS 17 BP 2036 EP 2038 DI 10.1063/1.108351 PG 3 WC Physics, Applied SC Physics GA JV041 UT WOS:A1992JV04100013 ER PT J AU AGARWAL, PK SHING, MT AF AGARWAL, PK SHING, MT TI ORIENTED ALIGNED RECTANGLE PACKING PROBLEM SO EUROPEAN JOURNAL OF OPERATIONAL RESEARCH LA English DT Article DE DYNAMIC PROGRAMMING; 2-DIMENSIONAL BIN-PACKING; MODULE PLACEMENT ID TWO-DIMENSIONAL PACKING; ALGORITHMS AB Given a collection R of n (= M X N) rectangles, we wish to pack it into M rows and N columns as the elements of an M X N matrix. The height of a row is defined to be the height of the tallest rectangle in that row, and the width of a column is defined to be the width of the widest rectangle in that column. The cost of a packing is the sum of the heights of the M rows plus the sum of the widths of the N columns. The oriented aligned rectangle packing problem is to find a packing with the minimum cost. In this paper we present an O(n) time algorithm and an O(n2) time algorithm for two non-trivial special cases. We also show how to extend the algorithms to handle other cost functions. C1 NYU,COURANT INST MATH SCI,NEW YORK,NY 10012. USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. RP AGARWAL, PK (reprint author), DUKE UNIV,DEPT COMP SCI,DURHAM,NC 27706, USA. NR 14 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-2217 J9 EUR J OPER RES JI Eur. J. Oper. Res. PD OCT 26 PY 1992 VL 62 IS 2 BP 210 EP 220 DI 10.1016/0377-2217(92)90249-9 PG 11 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA JV089 UT WOS:A1992JV08900008 ER PT J AU LINDSAY, GA STENGERSMITH, JD HENRY, RA HOOVER, JM NISSAN, RA WYNNE, KJ AF LINDSAY, GA STENGERSMITH, JD HENRY, RA HOOVER, JM NISSAN, RA WYNNE, KJ TI MAIN-CHAIN ACCORDION POLYMERS FOR NONLINEAR OPTICS SO MACROMOLECULES LA English DT Letter ID 2ND HARMONIC-GENERATION; 2ND-HARMONIC GENERATION; CROSS-LINKING; FILMS; DIPOLAR C1 OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. RP LINDSAY, GA (reprint author), USN,DIV AIR WARFARE CTR WEAPONS,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 21 TC 69 Z9 69 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD OCT 26 PY 1992 VL 25 IS 22 BP 6075 EP 6077 DI 10.1021/ma00048a037 PG 3 WC Polymer Science SC Polymer Science GA JV821 UT WOS:A1992JV82100037 ER PT J AU SWARTZLANDER, GA LAW, CT AF SWARTZLANDER, GA LAW, CT TI OPTICAL VORTEX SOLITONS OBSERVED IN KERR NONLINEAR MEDIA SO PHYSICAL REVIEW LETTERS LA English DT Article ID DISLOCATIONS AB Optical vortex-soliton filaments are observed in a bulk self-defocusing Kerr nonlinear refractive medium. The dark cylindrical core, located at the axis of a 2pi helical phase ramp, is stationary and stable, with a size that depends inversely on the field strength. Wave guiding of a weak probe beam within the core is reported. A single optical vortex soliton was experimentally created using a quasihelical phase mask. Pairs having opposite topological charge were experimentally and numerically investigated using a convective Kelvin-Helmholtz instability of dark soliton stripes. C1 JOHNS HOPKINS UNIV,DEPT ELECT & COMP ENGN,BALTIMORE,MD 21218. RP SWARTZLANDER, GA (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 6546,WASHINGTON,DC 20375, USA. RI liu, ze/A-2322-2010; OI Swartzlander, Grover/0000-0003-3513-2225 NR 22 TC 342 Z9 347 U1 3 U2 19 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 26 PY 1992 VL 69 IS 17 BP 2503 EP 2506 DI 10.1103/PhysRevLett.69.2503 PG 4 WC Physics, Multidisciplinary SC Physics GA JV013 UT WOS:A1992JV01300013 ER PT J AU ACTON, L TSUNETA, S OGAWARA, Y BENTLEY, R BRUNER, M CANFIELD, R CULHANE, L DOSCHEK, G HIEI, E HIRAYAMA, T HUDSON, H KOSUGI, T LANG, J LEMEN, J NISHIMURA, J MAKISHIMA, K UCHIDA, Y WATANABE, T AF ACTON, L TSUNETA, S OGAWARA, Y BENTLEY, R BRUNER, M CANFIELD, R CULHANE, L DOSCHEK, G HIEI, E HIRAYAMA, T HUDSON, H KOSUGI, T LANG, J LEMEN, J NISHIMURA, J MAKISHIMA, K UCHIDA, Y WATANABE, T TI THE YOHKOH MISSION FOR HIGH-ENERGY SOLAR PHYSICS SO SCIENCE LA English DT Article ID X-RAY TELESCOPE; A MISSION; FLARES; SPECTROMETER; SOFT AB The Japanese Yohkoh satellite is now in orbit observing the sun with a set of x-ray imagers and x-ray and gamma-ray spectrometers. The data from this successful mission provide new information on solar flares and the sun's corona. This paper discusses the Yohkoh observations and presents a sample of the first scientific results from the mission. C1 UNIV TOKYO, INST ASTRO, MITAKA, TOKYO 181, JAPAN. INST SPACE & ASTRONAUT SCI, SAGAMIHARA, KANAGAWA 229, JAPAN. UCL, MULLARD SPACE SCI LAB, HOLMBURY, ENGLAND. NATL ASTRON OBSERV JAPAN, MITAKA, TOKYO 181, JAPAN. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. UNIV TOKYO, FAC SCI, DEPT ASTRON, BUNKYO KU, TOKYO 113, JAPAN. UNIV TOKYO, FAC SCI, DEPT PHYS, BUNKYO KU, TOKYO 113, JAPAN. UNIV HAWAII, INST ASTRON, HONOLULU, HI 96822 USA. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP LOCKHEED PALO ALTO RES LABS, PALO ALTO, CA 94304 USA. NR 32 TC 122 Z9 122 U1 0 U2 2 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD OCT 23 PY 1992 VL 258 IS 5082 BP 618 EP 625 DI 10.1126/science.258.5082.618 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JU745 UT WOS:A1992JU74500050 PM 17748896 ER PT J AU GRAY, JE AF GRAY, JE TI ELECTROMAGNETIC-WAVES WITH E-PARALLEL-TO-B SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Article AB In this paper, two explanations of how to obtain electromagnetic waves with E parallel-to B are presented. The nature of these solutions is discussed, with a caveat on what constitutes a general solution. Finally, an example of an electromagnetic wave with the electric field parallel to magnetic field is presented. RP GRAY, JE (reprint author), USN,CTR SURFACE WARFARE,CODE G-71,DAHLGREN,VA 22448, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0305-4470 J9 J PHYS A-MATH GEN JI J. Phys. A-Math. Gen. PD OCT 21 PY 1992 VL 25 IS 20 BP 5373 EP 5376 DI 10.1088/0305-4470/25/20/017 PG 4 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA JV718 UT WOS:A1992JV71800017 ER PT J AU STENGER, DA GEORGER, JH DULCEY, CS HICKMAN, JJ RUDOLPH, AS NIELSEN, TB MCCORT, SM CALVERT, JM AF STENGER, DA GEORGER, JH DULCEY, CS HICKMAN, JJ RUDOLPH, AS NIELSEN, TB MCCORT, SM CALVERT, JM TI COPLANAR MOLECULAR ASSEMBLIES OF AMINOALKYLSILANE AND PERFLUORINATED ALKYLSILANE - CHARACTERIZATION AND GEOMETRIC DEFINITION OF MAMMALIAN-CELL ADHESION AND GROWTH SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID HIPPOCAMPAL-NEURONS; MONOLAYERS; SURFACES; GOLD; SILICON; ALKANETHIOLS; SPECTROSCOPY; ELECTRODES; ADSORPTION; PROTEINS AB The photochemistry of organosilanes was used to (1) create mixed monolayers having continuously adjustable surface free energies and (2) affect high resolution adhesion and spatial orientation of biological cells on silica substrates. Monolayers were formed from two materials, an aminoalkylsilane, NH2(CH2)2NH(CH2)3Si(OCH3)3 (EDA), and a perfluorinated alkylsilane, CF3(CF2)5(CH2)2Si(CH3)2Cl (13F), and were characterized by ellipsometry and water contact angle measurements. Deep UV (193 nm) radiation was used to induce photochemical changes in the cell-adhesive EDA monolayers. X-ray photoelectron spectroscopy indicated that the amine groups of EDA were removed by the exposure, leaving only Si-OH or alkyl fragments having less-than-or-equal-to 3 carbons. The exposed substrates were then reacted with 13F to form mixed monolayers or hydrophobic monolayers that inhibited cell adhesion in the irradiated regions. The degree of 13F reactivity with EDA in the unirradiated regions was observed to be solvent-dependent, suggesting that conformational states of the surface amine groups lead to a reduction in their accessibility. The selective photochemistry was exploited to produce high resolution molecular patterns, defined using patterned irradiation, that were mapped with scanning Auger electron spectroscopy. The patterns were used to spatially control the adhesion and direct the outgrowth of rat hippocampal neurons and porcine aortic endothelial cells in vitro. Patterns of controlled geometry may provide new approaches to the study of surface-directed growth, intercellular communication, and organogenesis or be used to control the alignment of individual cells with transducer elements in biosensors and implants. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. SCI APPLICAT INT CORP,MCLEAN,VA 22102. NIAAA,ROCKVILLE,MD 20852. USN,MED RES INST,BETHESDA,MD 20889. RP STENGER, DA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 40 TC 281 Z9 283 U1 0 U2 26 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 OCT 21 PY 1992 VL 114 IS 22 BP 8435 EP 8442 DI 10.1021/ja00048a013 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA JV028 UT WOS:A1992JV02800013 ER PT J AU ROSENBLATT, M WAHLEN, BE AF ROSENBLATT, M WAHLEN, BE TI A NONPARAMETRIC MEASURE OF INDEPENDENCE UNDER A HYPOTHESIS OF INDEPENDENT COMPONENTS SO STATISTICS & PROBABILITY LETTERS LA English DT Article DE NONPARAMETRIC; TEST OF INDEPENDENCE; DENSITY FUNCTION ESTIMATE; KERNEL ID DENSITY AB Asymptotic normality is derived for a nonparametric measure of independence of the components of random two-vectors. This result is obtained without the restrictive assumptions previously made on the rate of convergence of the bandwidth sequence of the density estimates used. C1 UNIV CALIF SAN DIEGO,DEPT MATH,LA JOLLA,CA 92093. USN,COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,SAN DIEGO,CA 92132. NR 8 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-7152 J9 STAT PROBABIL LETT JI Stat. Probab. Lett. PD OCT 21 PY 1992 VL 15 IS 3 BP 245 EP 252 DI 10.1016/0167-7152(92)90197-D PG 8 WC Statistics & Probability SC Mathematics GA JU929 UT WOS:A1992JU92900014 ER PT J AU BULMER, CH MOELLER, RP BURNS, WK AF BULMER, CH MOELLER, RP BURNS, WK TI EFFECT OF PHASE NOISE IN LINEAR MODULATOR SYSTEMS SO APPLIED OPTICS LA English DT Article ID INTERFEROMETERS AB Measurements of noise levels with semiconductor lasers and long lengths of polarization-preserving fiber, as used in typical linear modulator systems, show noise levels that are approximately 10 dB above thermal noise because of laser phase-to-intensity noise conversion. Data are presented for several launching angles into both polarization-preserving and polarizing fiber. There is good agreement with theory for the variation in noise with an output analyzer angle. To reduce the noise either a single frequency source must be used or the polarization-preserving fiber must be replaced by a conventional single-mode fiber. RP BULMER, CH (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6571,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 8 TC 1 Z9 1 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD OCT 20 PY 1992 VL 31 IS 30 BP 6437 EP 6440 PG 4 WC Optics SC Optics GA JR914 UT WOS:A1992JR91400009 PM 20733858 ER PT J AU WOOD, KS IMAMURA, JN WOLFF, MT AF WOOD, KS IMAMURA, JN WOLFF, MT TI NOISE-DRIVEN RADIATIVE SHOCKS .2. FURTHER IMPLICATIONS FOR THE QUASI-PERIODIC OSCILLATIONS OF THE AM HERCULIS OBJECTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIATION MECHANISMS, BREMSSTRAHLUNG; SHOCK WAVES; STARS, OSCILLATIONS; WHITE DWARFS ID TIME-DEPENDENT ACCRETION; X-RAY; DEGENERATE DWARFS; WHITE-DWARFS; UV-RADIATION; VARIABILITY; STABILITY; INSTABILITY; E1405-451; EMISSION AB Several AM Her objects exhibit low-amplitude, approximately 1 Hz quasi-periodic oscillations (QPOs) in their optical emission. Wolff, Wood, & Imamura have recently shown that accretion noise can drive oscillations in the shocks of these systems and thereby produce QPOs. In this paper we show that (1) bremsstrahlung-dominated shocks produced by accretion onto white dwarfs can produce QPO-like features in the optical and X-ray for a wide range of properties, a range which includes the AM Her QPO sources. (2) The response of these bremsstrahlung-dominated shocks is linear for the conditions typically found in the QPO sources. The luminosities of the QPO sources can thus be represented by L(t) = M(t) * R(L)(t), Where the asterisk represents convolution, M(t) is the mass accretion rate, and R(L)(t) is the response function of a shock to an impulsive disturbance in M. Since the R(L)(t) are functions only of the average M, M*, and B*, a powerful tool for the analysis of the time series data of the AM Her QPO objects may be developed based on the driven shock model. C1 UNIV OREGON,INST THEORET SCI,EUGENE,OR 97403. UNIV OREGON,DEPT PHYS,EUGENE,OR 97403. RP WOOD, KS (reprint author), USN,RES LAB,CODE 4121,WASHINGTON,DC 20375, USA. NR 24 TC 21 Z9 21 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1992 VL 398 IS 2 BP 593 EP 601 DI 10.1086/171884 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JR890 UT WOS:A1992JR89000020 ER PT J AU FELDMAN, U LAMING, JM MANDELBAUM, P GOLDSTEIN, WH OSTERHELD, A AF FELDMAN, U LAMING, JM MANDELBAUM, P GOLDSTEIN, WH OSTERHELD, A TI A BURST MODEL FOR LINE EMISSION IN THE SOLAR ATMOSPHERE .2. CORONAL EXTREME ULTRAVIOLET LINES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; ATOMIC PROCESSES; PLASMAS; SUN, CORONA ID CA-XVII; IONS; EXCITATION; IONIZATION AB We review the spectroscopic evidence for explosive events, hereafter referred to as bursts, occurring in solar coronal plasmas. Problems in the interpretation of extreme ultraviolet spectra from Mg-like ions, particularly Fe XV in solar flares can be obviated to certain extent if these ions are produced in an ionizing plasma, with the 3s3 p 3P levels being excited directly by inner shell ionization of the Al-like ion. We believe that a similar mechanism should apply to Be-like ions. The excitation following inner shell ionization can become important compared to electron impact excitation at a temperature corresponding to approximately twice the ionization potential of the ion concerned, but to be properly effective, it requires some deviation of the electron distribution function from a Maxwellian. In a burst of such a temperature, however, electron impact excitation during the decay phase, assuming radiative cooling of the plasma, will normally make the inner shell contribution insignificant, and so some other means of " switching off " the burst has to be postulated. The model we present produces a coronal heating rate from these bursts that is somewhat larger than current estimates. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 22 TC 31 Z9 31 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1992 VL 398 IS 2 BP 692 EP 697 DI 10.1086/171893 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JR890 UT WOS:A1992JR89000029 ER PT J AU SMITH, HA FISCHER, J AF SMITH, HA FISCHER, J TI MULTIPLE JETS FROM THE YOUNG STAR IRAS-21334+5039 SO ASTROPHYSICAL JOURNAL LA English DT Article DE CIRCUMSTELLAR MATTER; INFRARED, STARS; ISM, JETS AND OUTFLOWS; STARS, IMAGING; STARS, INDIVIDUAL (IRAS-21334+5039) ID CIRCUMSTELLAR ENVELOPE; INFRARED-EMISSION; IRAS 16293-2422; SOLAR CIRCLE; L1551 IRS-5; OUTFLOW; REGIONS AB The source IRAS 21334 + 5039, a young stellar object (YSO) with broad CO outflow velocity profiles, was imaged in the 1-2 mum region with broad-band J, H, and K filters, and with a Fabry-Perot set to the molecular hydrogen upsilon = 1-0 S(1) line, the hydrogen Brgamma recombination line, and the neighboring continua. At 2 mum the source has an elongated continuum emission structure centered on the star. The structure has very blue tips, with a weak VLA 6 cm continuum source coincident with one of them. Strong molecular hydrogen emission appears as bow-shaped arcs oriented along an axis perpendicular to the continuum emission, and as a weaker structure aligned with it. Both the continuum and the molecular hydrogen emission are most likely produced by jets, possibly emanating in multiple directions from the central source at large angles to each other. While jets are a common feature of young stars, this source provides solid evidence for multiple jet structures. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP SMITH, HA (reprint author), SMITHSONIAN INST,NATL AIR & SPACE MUSEUM,ASTROPHYS LAB,MS-321,WASHINGTON,DC 20560, USA. NR 34 TC 8 Z9 8 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1992 VL 398 IS 2 BP L99 EP & DI 10.1086/186586 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JR892 UT WOS:A1992JR89200006 ER PT J AU LOWEMA, CK VANDERAH, TA AF LOWEMA, CK VANDERAH, TA TI IN SEARCH OF CHEMICAL CLUES - SINGLE-CRYSTAL STRUCTURAL STUDIES OF PRBA2CU3O6 AND PRBA2CU3O7 SO PHYSICA C LA English DT Article ID NEUTRON-POWDER-DIFFRACTION; BOND-VALENCE SUMS; SUPERCONDUCTING TRANSITION-TEMPERATURE; COPPER-OXIDE SUPERCONDUCTORS; X-RAY-DIFFRACTION; HIGH-TC; CUPRATE SUPERCONDUCTORS; MAGNETIC-SUSCEPTIBILITY; COMPOUND SYSTEM; INTERNAL STRAIN AB Complete refinements of single-crystal X-ray diffraction intensity data for two tetragonal PrBa2Cu3O6 crystals and for two detwinned orthorhombic PrBa2Cu3O7 crystals, along with a more precise refinement for YBa2Cu3O6, have confirmed that the praseodymium compounds are strictly isostructural with the yttrium congeners. Crystallographic data available for the superconducting orthorhombic RBa2Cu3O7 analogs (R = Y, rare earth) were used to establish overall structural trends as a function of lanthanide size. In comparison with these trends, the present results obtained for orthorhombic PrBa2Cu3O7 indicate no markedly unusual structural features; the crystallographic behavior of Pr corresponds to that of the trivalent ion. However, subtle structural anomalies in the PrBa2Cu3Ox system were revealed by detailed comparisons of structural trends in RBa2Cu3Ox systems as a function of oxygen content. The axial Cu-O bond distance is unusually short in both PrBa2Cu3O6 and PrBa2Cu3O7, indicating stronger chemical linkage of the chains and planes as compared to the superconducting systems. Trends in the bond-valence sums and polyhedral volumes about R3+ suggest that in PrBa2Cu3O7 the increased spatial extension of the 4f-orbitals (as compared to neighboring Nd3+) mediates strong interactions with the Cu-O manifold that are capable of inhibiting superconductivity. The retention of superconductivity in Pr1.85Ce0.15CuO4 may arise from significant crystal-chemical differences between the T'- and the YBa2Cu3O7-type structures: the T' structure features (1) oxygen layers that are bonded only to Pr, not Cu, and (2) a larger R3+ polyhedral volume that results in greater isolation of the 4f-orbitals. RP LOWEMA, CK (reprint author), USN,CTR AIR WARFARE,DIV WEAP,DIV CHEM,RES DEPT,CHINA LAKE,CA 93555, USA. NR 83 TC 47 Z9 47 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD OCT 20 PY 1992 VL 201 IS 3-4 BP 233 EP 248 DI 10.1016/0921-4534(92)90469-S PG 16 WC Physics, Applied SC Physics GA JW509 UT WOS:A1992JW50900001 ER PT J AU JONES, TE MCGINNIS, WC JACOBS, EW BOSS, RD THIBADO, PM BRIGGS, JS GLAD, WE AF JONES, TE MCGINNIS, WC JACOBS, EW BOSS, RD THIBADO, PM BRIGGS, JS GLAD, WE TI EFFECT OF SILVER ADDITIONS ON SINTERED BI2SR2CACU2O8 SO PHYSICA C LA English DT Article ID CRITICAL CURRENT DENSITIES; CU-O SUPERCONDUCTOR; AG AB Up to 30 weight-percent silver has been added, in the form of silver peroxide, prior to the final sintering step in the preparation of the high-T(c) superconductor Bi2Sr2CaCu2O8. The sintered samples were characterized by optical microscopy and image analysis, energy-dispersive X-ray analysis, and X-ray diffraction. Intergranular and intragranular critical current densities were measured by transport and magnetization techniques, respectively. Under the sintering conditions used, there is no evidence of silver inclusion in the lattice, nor of any effect on the stoichiometry due to the silver additions. The silver does have a large effect, though, on the sample morphology, and, therefore, on the intergranular critical current density. However, only a modest variation of the intragranular critical current density is observed with added silver. RP JONES, TE (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,MAT RES BRANCH,SAN DIEGO,CA 92152, USA. NR 19 TC 13 Z9 13 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 OCT 20 PY 1992 VL 201 IS 3-4 BP 279 EP 288 DI 10.1016/0921-4534(92)90474-Q PG 10 WC Physics, Applied SC Physics GA JW509 UT WOS:A1992JW50900006 ER PT J AU FLIPPEN, RB ASKEW, TR OSOFSKY, MS AF FLIPPEN, RB ASKEW, TR OSOFSKY, MS TI CHI'' PEAK MEASUREMENTS IN HTSC SINGLE-CRYSTALS SO PHYSICA C LA English DT Article ID LOWER CRITICAL FIELDS; CU-O CRYSTALS; FREQUENCY-DEPENDENCE; SUPERCONDUCTORS; PENETRATION AB The use of AC inductance techniques to measure AC absorption (chi") in high-temperature superconducting materials is discussed. A single sharp peak in chi" versus temperature is typically seen for good crystals of YBa2Cu3O7-x. However, some crystals of this material show multiple chi" peaks which have different magnetic field and frequency dependences. Crystals of Bi2Sr2Ca1Cu2O8+y and Tl2Ba2Ca1Cu2O8+y show only single chi" peaks. Magnetic field, temperature, and measurement frequency dependences of chi" of these materials are presented. A critical state model is used to interpret these results. Multiple peak behavior is explained as the presence of different superconducting domains in the crystals. Attempts to alter these domains by modifying the oxygen content and distribution in crystals of YBa2Cu3O7-x by oxygen annealing were unsuccessful. Etching experiments did not show any surface contribution to the magnetic properties of these samples. C1 KALAMAZOO COLL,DEPT PHYS,KALAMAZOO,MI 49007. USN,RES LAB,WASHINGTON,DC 20375. RP FLIPPEN, RB (reprint author), DUPONT CO,CENT RES & DEV,POB 80228,WILMINGTON,DE 19880, USA. RI Osofsky, Michael/A-1050-2010 NR 19 TC 18 Z9 18 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 OCT 20 PY 1992 VL 201 IS 3-4 BP 391 EP 396 DI 10.1016/0921-4534(92)90488-X PG 6 WC Physics, Applied SC Physics GA JW509 UT WOS:A1992JW50900020 ER PT J AU MCCAULEY, SW BARONAVSKI, AP RICE, JK GHIRARDI, ML MATTOO, AK AF MCCAULEY, SW BARONAVSKI, AP RICE, JK GHIRARDI, ML MATTOO, AK TI A SEARCH FOR SUBPICOSECOND ABSORPTION COMPONENTS IN PHOTOSYSTEM-II REACTION CENTERS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PHOTOSYNTHETIC REACTION CENTERS; PRIMARY ELECTRON-TRANSFER; CHARGE SEPARATION RATE; RHODOPSEUDOMONAS-VIRIDIS; FEMTOSECOND SPECTROSCOPY; RHODOBACTER-SPHAEROIDES; MEMBRANE-PROTEIN; ENERGY-TRANSFER; COMPLEX; RESOLUTION AB The transient absorption kinetics of spinach photosystem II reaction centers were measured at 672 nm (detection bandwidth almost-equal-to 11 nm) following excitation at 310 nm. A temporal resolution of almost-equal-to 50 fs was used which is three times higher resolution than the current literature value. We observed a very fast absorption decrease with a rise time of 150 +/- 15 fs followed by a 13 +/- 4 ps recovery. The kinetics of the recovery step did not reveal a 3 ps component, however, a slight break in the data suggests a more complicated fit may explain the data as well or better. Based on a comparison of the rise time reported here and those reported by Durrant et al., the relaxation from S(n) to S(l) occurs very rapidly, within the 150 fs initial absorption decrease. C1 USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375. USDA ARS,BELTSVILLE AGR RES CTR,BELTSVILLE AGR RES CTR W,PLANT MOLEC BIOL LAB,BELTSVILLE,MD 20705. RI Mattoo, Autar/G-9863-2011 NR 26 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD OCT 16 PY 1992 VL 198 IS 5 BP 437 EP 442 DI 10.1016/0009-2614(92)80024-6 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JT385 UT WOS:A1992JT38500002 ER PT J AU KARLE, IL FLIPPENANDERSON, JL SUKUMAR, M BALARAM, P AF KARLE, IL FLIPPENANDERSON, JL SUKUMAR, M BALARAM, P TI DIFFERENCES IN HYDRATION AND ASSOCIATION OF HELICAL BOC-VAL-ALA-LEU-AIB-VAL-ALA-LEU-(VAL-ALA-LEU-AIB)2-OME.XH2O IN 2 CRYSTALLINE POLYMORPHS SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID ALPHA-AMINOISOBUTYRIC-ACID; SYNTHETIC PROTEIN MIMICS; MODULAR DESIGN; AMINO-ACIDS; AIB-OME; PEPTIDE; APOLAR; ALAMETHICIN; PARALLEL; CHANNEL AB The 15-residue apolar peptide, Boc-Val-Ala-Leu-Aib-Val-Ala-Leu-(Val-Ala-Leu-Aib)2-OMe has been crystallized from 2-propanol-water (form I). The crystal parameters for I are as follows: C74H133N15O18.2H2O, Space group P2(1), a = 9.185 (6) angstrom, b = 47.410 (3) angstrom, c = 10.325 (9) angstrom, beta = 91.47 (2)-degrees, Z = 2, R = 6.3% for 4532 reflections observed > 3sigma(F), resolution 0.94 angstrom. The structure is almost completely alpha-helical with eleven 5 --> 1 hydrogen bonds and one 4 --> 1 hydrogen bond near the N-terminus. The structure has been compared with a polymorph (form II) obtained from methanol-water (Karle, I. L.; Flippen-Anderson, J. L.; Uma, K.; Sukumar, M.; Balaram, P., J. Am. Chem. Soc. 1990,112,9350-9356). The two forms differ in the extent of hydration; form I contains two water molecules in the head-to-tail region of helical columns, while form II is more extensively solvated, with the equivalent of 7.5 water molecules. The three-dimensional packing of helices is completely parallel in I and antiparallel in II. C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM30902] NR 38 TC 12 Z9 12 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD OCT 16 PY 1992 VL 35 IS 21 BP 3885 EP 3889 DI 10.1021/jm00099a016 PG 5 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA JU801 UT WOS:A1992JU80100017 PM 1433198 ER PT J AU FLIPPENANDERSON, JL GEORGE, C AF FLIPPENANDERSON, JL GEORGE, C TI ABSOLUTE-CONFIGURATION OF (-)-ALPHA-ACETYLMETHADOL HYDROCHLORIDE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB Beta-[2-(Dimethylamino)propyl]-alpha-ethyl-beta-phenylbenzeneethanol acetate ester hydrochloride, C23H32NO2+.Cl-H2O, M(r) = 407.9, monoclinic, P2(1), a = 15.608 (4), b = 8.637 (2), c = 17.273 (5) angstrom, beta = 97.71 (2)-degrees, V = 2307.4 (1) angstrom3, Z = 4 (two methadol hydrochlorides and two water molecules per asymmetric unit), D(x) = 1.17 Mg M-3, lambda(Cu Kalpha) = 1.54184 angstrom, mu = 1.64 mm-1, F(000) = 880, T = 295 K, final R = 0.069, wR = 0.064 for 2559 independent observed reflections. Both asymmetric C atoms in the two independent methadol molecules are 'S'. Of the two N-H moieties one acts as a hydrogen-bond donor to a Cl atom (N-H = 1.21, H...Cl = 1.85, N...Cl = 3.03 angstrom, N-H...Cl = 162.3-degrees) and the other is a donor to a water molecule (N-H = 0.90, H...O = 2.06, N...O = 2.80 angstrom, N-H...O = 138.2-degrees). In addition, both water molecules hydrogen bond to both Cl atoms with O...Cl distances in the range 3.06-3.36 angstrom. A comparison of torsion angles for the two independent methadol molecules indicates that there is very little stereochemical similarity between them. RP FLIPPENANDERSON, JL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 7 TC 0 Z9 0 U1 0 U2 1 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 OCT 15 PY 1992 VL 48 BP 1855 EP 1857 DI 10.1107/S0108270192001409 PN 10 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JW261 UT WOS:A1992JW26100045 PM 1445673 ER PT J AU GILARDI, R FLIPPENANDERSON, JL GEORGE, CF AF GILARDI, R FLIPPENANDERSON, JL GEORGE, CF TI STRUCTURE OF 8,10-DIACETYL-2,4,6-TRINITRO-2,4,6,8,10-PENTAAZABICYCLO[5.3.0]DECANE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB 2,4,6-Trinitro-2,4,6,8,10-pentaazabicyclo-[5.3.0]decane-8,10-diyl dimethyl diketone, C9H14-NgO8, M(r)=362.3, orthorhombic, P2(1)2(1)2(1), a = 8.145 (2), b = 12.238 (2), c = 14.186 (3) angstrom, V = 1413.9 (4) angstrom3, Z = 4, D(x) = 1.702 Mg M-3, lambda(Cu Kalpha) = 1.54184 angstrom, mu = 1.31 mm-1, F(000) = 752, T = 295 K, final R = 0.046, wR = 0.053 for 1302 independent observed reflections. The two rings in this polyamine are fused cis to one another, imparting a folded shape to the bicyclic system. The parameters of the five-membered ring fit a flattened envelope conformation, with one N atom lying 0.25 angstrom from the (+/- 0.01 angstrom) plane of the other four atoms. The torsion angles of the seven-membered ring are intermediate between those of the ideal chair and twist-chair forms of cycloheptane, but are closer to a chair form. Of the five tri-substituted amine atoms, one is essentially flat, and the other four are slightly pyramidal (the angles between the exocyclic amine bonds and the adjacent CNC planes range from 16.2 to 24.0-degrees). RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 4 TC 2 Z9 2 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 OCT 15 PY 1992 VL 48 BP 1872 EP 1873 DI 10.1107/S0108270192001707 PN 10 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JW261 UT WOS:A1992JW26100053 ER PT J AU HAMMEL, BA KANIA, DR ROGERS, F IGLESIAS, CA LEE, RW SEELY, JF BROWN, CM EDWARDS, JM AF HAMMEL, BA KANIA, DR ROGERS, F IGLESIAS, CA LEE, RW SEELY, JF BROWN, CM EDWARDS, JM TI HIGH-RESOLUTION XUV ABSORPTION-SPECTRA OF RADIATIVELY HEATED CH FOILS SO EUROPHYSICS LETTERS LA English DT Article ID LASER; SPECTROSCOPY; OPACITIES; PLASMAS AB We have performed measurements of the absorption spectra of X-ray heated thin (1 mum) CH foils in the spectral region of the carbon K-edge (200-500 eV). One arm of the Nova laser is incident on a 025 mum thick Au foil, producing a soft X-ray source that radiatively heats the CH sample, placed in close proximity to the foil. Absorption spectra are obtained by viewing the soft X-rays from the Au foil, passing through the sample, with a 3 m grazing-incidence spectrometer. We observe strong absorption from bound-bound transitions, in qualitative agreement with calculations (OPAL). These measurements resolve questions raised in earlier work (EDWARDS J. et al., Europhys. Lett., 11 (1990) 631) where thicker samples (5 mum) led to absorption saturation and the formation of an <> structure near the position of the cold-carbon edge. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,LONDON SW7 2AZ,ENGLAND. RP HAMMEL, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,7000 E AVE,LIVERMORE,CA 94550, USA. NR 15 TC 11 Z9 11 U1 3 U2 3 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD OCT 15 PY 1992 VL 20 IS 4 BP 319 EP 324 DI 10.1209/0295-5075/20/4/006 PG 6 WC Physics, Multidisciplinary SC Physics GA JX287 UT WOS:A1992JX28700006 ER PT J AU LIPKOWITZ, S GOBEL, V VARTERASIAN, ML NAKAHARA, K TCHORZ, K KIRSCH, IR AF LIPKOWITZ, S GOBEL, V VARTERASIAN, ML NAKAHARA, K TCHORZ, K KIRSCH, IR TI A COMPARATIVE STRUCTURAL CHARACTERIZATION OF THE HUMAN NSCL-1 AND NSCL-2 GENES - 2 BASIC HELIX-LOOP-HELIX GENES EXPRESSED IN THE DEVELOPING NERVOUS-SYSTEM SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID DNA-BINDING PROTEINS; MESSENGER-RNA; DROSOPHILA-MELANOGASTER; NEGATIVE REGULATOR; ENHANCER-BINDING; POINT MUTATIONS; N-MYC; SEQUENCE; ACHAETE; COMPLEX AB Human cDNA clones for NSCL-1 and NSCL-2, two basic domain helix-loop-helix (bHLH) genes expressed predominantly in the developing nervous system, were obtained from a fetal brain cDNA library. The full-length transcripts and the genomic structures were determined. The cDNAs for the two genes encode predicted proteins of similar size (133 and 135 amino acids for NSCL-1 and NSCL-2, respectively) and structure. The carboxyl-terminal 75 amino acids of the two proteins contain the bHLH motif and differ from each other by only three conservative amino acid changes, while the amino-terminal portions are markedly divergent from each other. In addition to the similar protein structure, the genes have a similar genomic organization, suggesting a close evolutionary relationship. The 5'-regulatory regions of the two genes share some features (i.e. potential TATA, CCAAT, and GATA binding sites) but also differ significantly in their G+C content. NSCL-1 is relatively G+C-rich (63%) in the sequences upstream of transcription initiation and has multiple potential binding sites for transcription factors that bind to G+C-rich sequences (e.g. AP-2). NSCL-2 is relatively A+T-rich (63%) in this region and has a potential binding site for AP1. Studies of expression in normal tissues demonstrated expression of NSCL-1 and NSCL-2 in the developing central and peripheral nervous system, most likely in developing neurons. Additional Northern analysis studies in cell lines revealed expression of these genes in some cell lines derived from tumors with neural or neuroendocrine features such as neuroblastoma, PNET, and small cell lung cancer. NSCL-1 is expressed in a larger number of these cell lines. The differences in expression may parallel differences in developmental regulation. RP LIPKOWITZ, S (reprint author), NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892, USA. NR 50 TC 51 Z9 54 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD OCT 15 PY 1992 VL 267 IS 29 BP 21065 EP 21071 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JT978 UT WOS:A1992JT97800087 PM 1328219 ER PT J AU ABREU, M LARRAZA, A THORNTON, E AF ABREU, M LARRAZA, A THORNTON, E TI NONLINEAR TRANSFORMATION OF DIRECTIONAL WAVE SPECTRA IN SHALLOW-WATER SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID GRAVITY-WAVES; MODEL AB A shallow water, nonlinear spectral wave transformation model is developed for conditions of a mild sloping bottom (mu = DELTAh/kh much less than 1) and small amplitude effects (epsilon = zeta/h much less than 1). Nonlinearities and combined shoaling and refraction effects act on the same time and length scales. The evolution equation of the wave action is prescribed by the wave Boltzmann equation, whereby resonant collinear triad interactions transfer energy among Fourier components. Combined shoaling and refraction effects are taken into account through the geometrical optics approximation. A numerical solution of the three-wave collision integral is presented, and the steady state wave Boltzmann equation is integrated using a piecewise ray method. The model is tested using the high-resolution frequency-directional wave spectra of Freilich, Guza, and Elgar (1990) that show nonlinear transfers of energy between both harmonic and nonharmonic frequencies. A digitized version of the measured frequency-directional spectrum at 10-m depth is evolved 246 m shoreward over a bathymetry of straight and parallel bottom contours to 4-m depth. The model predicts the prominent spectral features in the measured wave field. The model results are in general superior to estimates using linear, finite depth wave theory, and they compare well with the observations in the region of the spectrum dominated by nonlinear effects. C1 USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. NR 16 TC 17 Z9 20 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD OCT 15 PY 1992 VL 97 IS C10 BP 15579 EP 15589 DI 10.1029/92JC01826 PG 11 WC Oceanography SC Oceanography GA JT996 UT WOS:A1992JT99600010 ER PT J AU GARLAND, NL DOUGLASS, CH NELSON, HH AF GARLAND, NL DOUGLASS, CH NELSON, HH TI PRESSURE AND TEMPERATURE-DEPENDENCE OF THE KINETICS OF THE REACTION AL+CO2 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HTFFR KINETICS; CO; COMPLEXES; ALO; ALCL; HCL AB We measured the pressure and temperature dependence of the rate constants of the reaction of Al + CO2 between 10 and 600 Torr total pressure and 298 and 1215 K in our high-temperature reactor. The Al atoms were generated by the 248-nm photolysis of Al(CH3)3 and probed by laser-induced fluorescence. Below 700 K, the rate constants show a strong pressure dependence suggesting that the reaction is proceeding through a complex formation mechanism with some decomposition of the complex to the products AlO and CO. Above 700 K, the observed rate constants are pressure independent, indicating that a direct abstraction channel becomes dominant. An Arrhenius fit to the rate constants measured in this high-temperature regime results in a preexponential factor of (2.9 +/- 0.7) X 10(-10) cm3 s-1 and an activation energy of 6.4 +/- 0.4 kcal mol-1. RP GARLAND, NL (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. NR 24 TC 14 Z9 14 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 15 PY 1992 VL 96 IS 21 BP 8390 EP 8394 DI 10.1021/j100200a034 PG 5 WC Chemistry, Physical SC Chemistry GA JU555 UT WOS:A1992JU55500034 ER PT J AU CHOW, GM STOCKTON, WB PRICE, R BARAL, S TING, AC RATNA, BR SHOEN, PE SCHNUR, JM BERGERON, GL CZARNASKI, MA HICKMAN, JJ KIRKPATRICK, DA AF CHOW, GM STOCKTON, WB PRICE, R BARAL, S TING, AC RATNA, BR SHOEN, PE SCHNUR, JM BERGERON, GL CZARNASKI, MA HICKMAN, JJ KIRKPATRICK, DA TI FABRICATION OF BIOLOGICALLY BASED MICROSTRUCTURE COMPOSITES FOR VACUUM FIELD-EMISSION SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID TUBULES AB A multidisciplinary approach to the fabrication of biologically based microstructure composites for vacuum field emission is described. Diacetylenic lipid 1,2-bis(10, 12-tricosadiynoyl)-sn-glycero-3-phosphocholine (DC, PC) was self-assembled to form hollow cylindrical tubules approximately 0.5 mum in average diameter and 50-80 mum long. Following the deposition of nickel on the inner and outer tubule sur-faces by an electroless plating method, the nickel-plated tubules were magnetically aligned in an epoxy matrix to form a composite material. Subsequent selective removal of the matrix provided a composite base template of oriented exposed tubules. The tubule template was coated with a thin sputtered gold film to provide the surface electrical contact. The resultant microstructures demonstrated vacuum field emission of current I > 10 muA at relatively low applied macroscopic electric fields (about 60-150 kV cm-1). C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. GEOCENTERS INC,FT WASHINGTON,MD 20744. GEORGETOWN UNIV,SCH MED,WASHINGTON,DC 20007. RP CHOW, GM (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 4790,WASHINGTON,DC 20375, USA. NR 21 TC 26 Z9 28 U1 3 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD OCT 15 PY 1992 VL 158 IS 1 BP 1 EP 6 DI 10.1016/0921-5093(92)90128-N PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JX651 UT WOS:A1992JX65100001 ER PT J AU HARIHAR, P STAPOR, WJ CAMPBELL, AB KNUDSON, AR CUTCHIN, J BLATCHLEY, CC AF HARIHAR, P STAPOR, WJ CAMPBELL, AB KNUDSON, AR CUTCHIN, J BLATCHLEY, CC TI NUCLEAR SPECTROSCOPY USING RISETIMES IN CERUSSITE SCINTILLATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID RISE TIME SPECTROSCOPY AB The pulse shape discriminating properties of a fast inorganic cerussite scintillator are investigated for energetic charged particles. Results show that the risetime increases with the stopping power, dE/dr, and varies with both the particle type and energy. C1 USN,RES LAB,WASHINGTON,DC 20375. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. SPIRE CORP,BEDFORD,MA 01730. RP HARIHAR, P (reprint author), UNIV MASSACHUSETTS,DEPT PHYS,LOWELL,MA 01854, USA. NR 6 TC 1 Z9 1 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 OCT 15 PY 1992 VL 322 IS 1 BP 40 EP 42 DI 10.1016/0168-9002(92)90355-8 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JV512 UT WOS:A1992JV51200006 ER PT J AU SPANO, ML WUNFOGLE, M DITTO, WL AF SPANO, ML WUNFOGLE, M DITTO, WL TI EXPERIMENTAL-OBSERVATION OF STOCHASTIC RESONANCE IN A MAGNETOELASTIC RIBBON SO PHYSICAL REVIEW A LA English DT Note ID CRISIS-INDUCED INTERMITTENCY; EXTERNAL PERIODIC FORCES; BISTABLE SYSTEMS; AMORPHOUS RIBBON; CLIMATIC-CHANGE; NOISE AB We report the observation of stochastic resonance in a parametrically driven bistable magnetoelastic buckling-ribbon experiment. We have found that the parametric addition of white noise increases the signal-to-noise ratio of the response of the ribbon by 10 to 12 dB relative to that of the ribbon with no externally added noise. We have also observed a characteristic spectrum for the probability of residence times for this weakly bistable system. C1 COLL WOOSTER,DEPT PHYS,WOOSTER,OH 44691. RP SPANO, ML (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. RI Spano, Mark/B-6883-2011; OI Ditto, William/0000-0002-7416-8012 NR 25 TC 40 Z9 40 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 OCT 15 PY 1992 VL 46 IS 8 BP 5253 EP 5256 DI 10.1103/PhysRevA.46.5253 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JW974 UT WOS:A1992JW97400102 ER PT J AU SINGH, DJ AF SINGH, DJ TI ELECTRONIC-STRUCTURE OF THE LAYERED NITRIDE LIMON2 SO PHYSICAL REVIEW B LA English DT Article ID BRILLOUIN-ZONE; SPECIAL POINTS; INTERPOLATION AB Electronic-structure calculations are reported for the layered ternary nitride LiMoN2. It is found that the material is best described as a three-dimensional metal consisting of strongly covalent MoN2 sheets and Li ions between them. Highly unusual strong direct bonding between N atoms in opposing layers is found. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 12 TC 15 Z9 15 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9332 EP 9335 DI 10.1103/PhysRevB.46.9332 PG 4 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200005 ER PT J AU FONG, CY NELSON, JS HEMSTREET, LA GALLUP, RF CHANG, LL ESAKI, L AF FONG, CY NELSON, JS HEMSTREET, LA GALLUP, RF CHANG, LL ESAKI, L TI RESONANT TUNNELING IN COUPLED QUANTUM DOTS SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-FIELD; STATES; SPECTROSCOPY; SPECTRA AB We have applied a scaled version of the Kohn-Sham equations of density-functional theory to study the charge distribution at the condition of resonant tunneling in coupled quantum dots. We find that the tunneling process is governed by the symmetry properties of the resonantly coupled quantum-dot states. At resonance, the coupled atomiclike quantum-dot states form bonding and antibonding molecular resonant-tunneling states. The charge distribution of the bonding-type state is given. In addition, we find asymmetries of the charge in the barrier vs voltage (analogous to I-V curves) as a result of electron-electron interactions between electrons in the excited tunneling and ground states. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. USN,RES LAB,WASHINGTON,DC 20375. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP FONG, CY (reprint author), UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616, USA. RI Esaki, Leo/B-2776-2011 NR 25 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9538 EP 9543 DI 10.1103/PhysRevB.46.9538 PG 6 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200031 ER PT J AU HARRISON, JA WHITE, CT COLTON, RJ BRENNER, DW AF HARRISON, JA WHITE, CT COLTON, RJ BRENNER, DW TI MOLECULAR-DYNAMICS SIMULATIONS OF ATOMIC-SCALE FRICTION OF DIAMOND SURFACES SO PHYSICAL REVIEW B LA English DT Article ID MUSCOVITE MICA; TUNGSTEN TIP; ANISOTROPY AB The friction which occurs when two diamond (111) hydrogen-terminated surfaces are placed in sliding contact is investigated for sliding in different crystallographic directions, as a function of applied load, temperature, and sliding velocity. We find a directional dependence to the friction coefficient, mu; that for certain crystallographic sliding directions mu increases with increasing load and as the temperature decreases; and that for the sliding speeds investigated here, mu is approximately independent of sliding velocity. We also found that the sliding velocity may become a factor for very slow, experimentally achievable sliding velocities when sliding in the [112BAR] direction but not for sliding in the [110BAR] direction. RP HARRISON, JA (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 29 TC 209 Z9 213 U1 4 U2 37 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 15 BP 9700 EP 9708 DI 10.1103/PhysRevB.46.9700 PG 9 WC Physics, Condensed Matter SC Physics GA JV112 UT WOS:A1992JV11200051 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI CLASSICAL INTERFACE MODES OF QUANTUM DOTS SO PHYSICAL REVIEW B LA English DT Article ID UNIFORM EXTERNAL-FIELD; SURFACE-MODES; 2 SPHERES; OPTICAL-ABSORPTION; RAMAN-SCATTERING; THIN-FILMS; LAPLACE EQUATION; PHONONS; SUPERLATTICES; CRYSTALS AB The classical surface and interface modes of dotlike microstructures and the optical absorption corresponding to them are studied within a dielectric continuum approach. Explicit results axe given mainly for the interface phonons of ionic materials, and it is noted that the same formalism applies to the surface plasmons of conducting materials. Analytical results for the modes are given for dots having the shapes of spheres and ellipsoids of revolution. An integral-equation approach is introduced to treat dots having arbitrary shapes. The dependence of the mode frequencies and eigenmodes on the dot shape and the dependence of the optical absorption on its shape and on the light polarization are discussed. An interesting feature that emerges is that the number of optically active modes increases as the dot shape becomes less symmetric. Dots with sharp tips axe found to support interface modes which are strongly enhanced in the vicinity of the tip, a fact relevant to phenomena involving electric fields near the tip of a scanning microscope probe. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 50 TC 70 Z9 73 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1992 VL 46 IS 16 BP 10310 EP 10320 DI 10.1103/PhysRevB.46.10310 PG 11 WC Physics, Condensed Matter SC Physics GA JW513 UT WOS:A1992JW51300047 ER PT J AU CHOU, SY LIU, Y CARRUTHERS, TF AF CHOU, SY LIU, Y CARRUTHERS, TF TI 32 GHZ METAL-SEMICONDUCTOR-METAL PHOTODETECTORS ON CRYSTALLINE SILICON SO APPLIED PHYSICS LETTERS LA English DT Article ID PHOTODIODE AB Interdigitated metal-semiconductor-metal (MSM) photodetectors with 1.2 mum finger spacing and 0.8 mum finger width were fabricated on crystalline Si substrate. The devices are transit time limited, exhibiting a measured full width at half maximum response time of 14 ps and a 3-dB bandwidth of 32 GHz. Monte Carlo simulations of Si MSM photodetector response time and bandwidth agree with experiments and predict that if the finger spacing of the Si MSM photodetectors is reduced to 25 nm, the response time can decrease to approximately 1 ps and the bandwidth can increase to 440 GHz. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CHOU, SY (reprint author), UNIV MINNESOTA,DEPT ELECT ENGN,MINNEAPOLIS,MN 55455, 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 12 PY 1992 VL 61 IS 15 BP 1760 EP 1762 DI 10.1063/1.108418 PG 3 WC Physics, Applied SC Physics GA JR733 UT WOS:A1992JR73300006 ER PT J AU MYERS, TH MEYER, JR HOFFMAN, CA RAMMOHAN, LR AF MYERS, TH MEYER, JR HOFFMAN, CA RAMMOHAN, LR TI HGTE-CDTE SUPERLATTICES FOR INFRARED DETECTION REVISITED SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; II-VI COMPOUNDS; SUPER-LATTICE; GAP; ELECTRON AB Selected properties of HgTe-CdTe superlattices are re-examined in light of the new consensus that the valence-band offset is large. We conclude that while the cutoff wavelength for infrared detectors remains easier to control in superlattices than in the corresponding Hg1-xCdxTe alloy, the advantage is less than was predicted earlier assuming a small offset. The reduction of tunneling noise and minority carrier collection efficiency are discussed on the basis of revised electron and hole masses in the growth direction. C1 USN,RES LAB,WASHINGTON,DC 20375. WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP MYERS, TH (reprint author), W VIRGINIA UNIV,DEPT PHYS,MORGANTOWN,WV 26506, USA. RI Ram-Mohan, Ramdas/C-5167-2012; Myers, Thomas/C-3769-2013 NR 20 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 12 PY 1992 VL 61 IS 15 BP 1814 EP 1816 DI 10.1063/1.108383 PG 3 WC Physics, Applied SC Physics GA JR733 UT WOS:A1992JR73300024 ER PT J AU ROLAND, CM NGAI, KL AF ROLAND, CM NGAI, KL TI NORMALIZATION OF THE TEMPERATURE-DEPENDENCE OF SEGMENTAL RELAXATION-TIMES SO MACROMOLECULES LA English DT Article ID GLASS-TRANSITION; SPECTROSCOPY; DYNAMICS; POLYMER; LIQUIDS; CHAIN; HEAT AB The validity of T(G)-scaled Arrhenius plots of segmental relaxation times for glass-forming liquids is assessed by comparing the results on polymers differing only in molecular weight. The differences result in identical segmental relaxation dispersions which occur, however, at different times and temperatures. It is verified herein that the T(G)-normalization scheme is a self-consistent means to classify and distinguish segmental relaxation behavior of polymers. Contrarily, changes in glass transition temperature effected by hydrostatic pressure alter the segmental dynamics in a manner such that the fragility of the polymer is altered. RP ROLAND, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 84 Z9 85 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD OCT 12 PY 1992 VL 25 IS 21 BP 5765 EP 5768 DI 10.1021/ma00047a030 PG 4 WC Polymer Science SC Polymer Science GA JT846 UT WOS:A1992JT84600030 ER PT J AU SPRANGLE, P ESAREY, E KRALL, J JOYCE, G AF SPRANGLE, P ESAREY, E KRALL, J JOYCE, G TI PROPAGATION AND GUIDING OF INTENSE LASER-PULSES IN PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID BEAT-WAVE ACCELERATOR; ELECTROMAGNETIC-WAVES; HARMONIC-GENERATION; IONIZATION; AMPLIFICATION AB A two-dimensional, axisymmetric, relativistic fluid model describing the propagation of intense laser pulses in plasmas is formulated and numerically evaluated. Relativistic guiding is ineffective in preventing the diffractive spreading of short laser pulses and long pulses become modulated due to relativistic and wake-field effects. Laser pulses can be propagated over many Rayleigh lengths by use of a preformed plasma density channel or by tailoring the pulse profile. Ultrahigh axial electric fields can be generated behind the laser pulse. RP SPRANGLE, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 29 TC 409 Z9 410 U1 6 U2 26 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 12 PY 1992 VL 69 IS 15 BP 2200 EP 2203 DI 10.1103/PhysRevLett.69.2200 PG 4 WC Physics, Multidisciplinary SC Physics GA JR648 UT WOS:A1992JR64800013 ER PT J AU WEILER, KW VANDYK, SD PANAGIA, N SRAMEK, RA AF WEILER, KW VANDYK, SD PANAGIA, N SRAMEK, RA TI FULL EVOLUTION OF THE 6 AND 20 CENTIMETER RADIO-EMISSION FROM SN-1980K SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIO CONTINUUM, STARS; SUPERNOVAE, INDIVIDUAL (SN-1980K) ID LARGE ARRAY; SUPER-NOVAE; CIRCUMSTELLAR; REMNANTS; MODELS AB First detected at 6 cm in 1980 November, only 1 month after optical maximum, and several months later at 20 cm in 1981 March, SN 1980K has now dropped below reasonable monitoring limits of the VLA at these two frequencies. It thus represents the first Type II radio supernova to have been well-studied at centimeter wavelengths from " turn-on " to " turn-off." It also represents one of the few radio supernovae to have such an extensive, decade-long, multiple-frequency data set. We present new observations of SN 1980K made with the VLA at 20 and 6 cm from 1984 November through 1990 December. Unless the radio emission strengthens again in the future, this completes our monitoring of the supernova at these wavelengths. The study of these "complete" light curves shows that the "minishell" model of Chevalier still provides the best representation of the data at both wavelengths. The similarities between the behavior of the radio emission from SN 1980K and SN 1979C argue that these two objects represent a distinct class of radio supernovae which is distinguishable from the radio emission from Type Ib supernovae, such as SN 1983N and SN 1984L, or the radio emission from the presumed Type II supernova SN 1986J. The implication is that there exist several classes of radio-emitting supernovae whose differing radio properties probably arise from different mass-loss rates and therefore different zero-age main-sequence masses of progenitor stars. C1 SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. UNIV CATANIA,I-95124 CATANIA,ITALY. RP WEILER, KW (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4215,WASHINGTON,DC 20375, USA. NR 22 TC 50 Z9 50 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 10 PY 1992 VL 398 IS 1 BP 248 EP 253 DI 10.1086/171852 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JQ397 UT WOS:A1992JQ39700023 ER PT J AU SZPAK, S MOSIERBOSS, PA SCHARBER, SR SMITH, JJ AF SZPAK, S MOSIERBOSS, PA SCHARBER, SR SMITH, JJ TI CHARGING OF THE PD/NH SYSTEM - ROLE OF THE INTERPHASE SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID GALVANOSTATIC DESORPTION; HYDROGEN; PALLADIUM; DEUTERIUM; PD; ABSORPTION; ELECTRODES; LAYERS; ACID AB The dynamics of transport of electrochemically generated deuterium across the electrode/electrolyte interphase was examined by slow scan (10 mV s-1) voltammetry. The investigation covers the potential range -1.2 to +0.4 V measured vs. an Ag/AgCl reference. It was found that a coupled, two-layer model of the interphase describes the observed behavior as a function of scan rate and electrolyte composition. The effect of chemisorbing species, e.g. CN- ions, as well as reactive species, e.g. SC(NH2)2, on the transport across the interphase is also discussed. Results are contrasted with those obtained for light water. C1 US DOE,WASHINGTON,DC 20585. RP SZPAK, S (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 23 TC 27 Z9 27 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD OCT 10 PY 1992 VL 337 IS 1-2 BP 147 EP 163 DI 10.1016/0022-0728(92)80534-B PG 17 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA JT128 UT WOS:A1992JT12800007 ER PT J AU MEHUYS, D WELCH, DF GOLDBERG, L AF MEHUYS, D WELCH, DF GOLDBERG, L TI 2.0W CW, DIFFRACTION-LIMITED TAPERED AMPLIFIER WITH DIODE INJECTION SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL AMPLIFIERS; LASERS; SEMICONDUCTOR LASERS ID HIGH-POWER; LASER; OPERATION; LOCKING; ARRAYS AB A tapered amplifier 1.5 mm in length and with a taper angle of 5.7-degrees emitted 2.0 W CW into a diffraction-limited pattern when injected with 25 mW incident power from a singlemode laser diode. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MEHUYS, D (reprint author), SPECTRA DIODE LABS,80 ROSE ORCHARD WAY,SAN JOSE,CA 95134, USA. NR 11 TC 54 Z9 54 U1 2 U2 4 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD OCT 8 PY 1992 VL 28 IS 21 BP 1944 EP 1946 DI 10.1049/el:19921246 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JU189 UT WOS:A1992JU18900003 ER PT J AU GEORGE, RD SNOW, AW MCMILLAN, PF BURROWS, VA AF GEORGE, RD SNOW, AW MCMILLAN, PF BURROWS, VA TI SYNTHESIS AND CHARACTERIZATION OF AN OLIGOMERIC MERCURY-BRIDGED PHTHALOCYANINE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note C1 ARIZONA STATE UNIV,DEPT CHEM & BIOCHEM,TEMPE,AZ 85287. ARIZONA STATE UNIV,DEPT CHEM BIO & MAT ENGN,TEMPE,AZ 85287. RP GEORGE, RD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 15 Z9 16 U1 1 U2 3 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 OCT 7 PY 1992 VL 114 IS 21 BP 8286 EP 8287 DI 10.1021/ja00047a047 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA JR863 UT WOS:A1992JR86300047 ER PT J AU COOPER, SA AF COOPER, SA TI PUNCTILIOUS COURTESY SO NEW REPUBLIC LA English DT Letter C1 USN,WASHINGTON,DC 20350. NR 0 TC 0 Z9 0 U1 0 U2 0 PU NEW REPUBLIC INC PI WASHINGTON PA 1220 19TH ST NW SUITE 600, WASHINGTON, DC 20036 SN 0028-6583 J9 NEW REPUBLIC JI New Repub. PD OCT 5 PY 1992 VL 207 IS 15 BP 4 EP 4 PG 1 WC Political Science SC Government & Law GA JP974 UT WOS:A1992JP97400002 ER PT J AU THEBAUD, CM AF THEBAUD, CM TI PUNCTILIOUS COURTESY SO NEW REPUBLIC LA English DT Letter C1 USN,WASHINGTON,DC 20350. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NEW REPUBLIC INC PI WASHINGTON PA 1220 19TH ST NW SUITE 600, WASHINGTON, DC 20036 SN 0028-6583 J9 NEW REPUBLIC JI New Repub. PD OCT 5 PY 1992 VL 207 IS 15 BP 4 EP 4 PG 1 WC Political Science SC Government & Law GA JP974 UT WOS:A1992JP97400001 ER PT J AU ABBOTT, DH STEIN, CA DIACHOK, O AF ABBOTT, DH STEIN, CA DIACHOK, O TI TOPOGRAPHIC RELIEF AND SEDIMENT THICKNESS - THEIR EFFECTS ON THE THERMAL EVOLUTION OF THE OCEANIC-CRUST SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID HEAT-FLOW; HYDROTHERMAL CIRCULATION; INDIAN-OCEAN; RIDGE; CONVECTION; ATLANTIC; AGE AB We compiled a suite of 490 heat flow measurements from the Pacific Ocean in areas with less than 85 m of sediment. Heat flow patterns at different basement ages vary with topographic relief. Areas with reliefs < 300 meters are conductively blanketed at 40-60 m.y. and may stop convecting at 70-90 m.y. Areas with reliefs > 300 meters are conductively blanketed at 70-90 m.y. and convect out to greater-than-or-equal-to 90-110 m.y. C1 UNIV ILLINOIS,DEPT GEOL SCI,CHICAGO,IL 60680. USN,RES LAB,WASHINGTON,DC 20375. RP ABBOTT, DH (reprint author), COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964, USA. OI Abbott, Dallas/0000-0003-4713-6098 NR 25 TC 6 Z9 6 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD OCT 2 PY 1992 VL 19 IS 19 BP 1975 EP 1978 DI 10.1029/92GL01996 PG 4 WC Geosciences, Multidisciplinary SC Geology GA JR219 UT WOS:A1992JR21900020 ER PT J AU LOUAT, N SADANANDA, K AF LOUAT, N SADANANDA, K TI ON THE DISLOCATION-FREE ZONE AND THE MODIFICATION OF G BY WORK-HARDENING SO ACTA METALLURGICA ET MATERIALIA LA English DT Article AB On the basis that a crack may be represented by a dislocation continuum it is shown that a crack extension force (G) cannot occur in the absence of a dislocation-free zone (D.F.Z.). Given such a zone it is shown that G is apt to be sensitive to the variation of flow stress in the plastic zone and hence to work hardening. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP LOUAT, N (reprint author), GEOCENTERS INC, FT WASHINGTON, MD USA. NR 11 TC 3 Z9 3 U1 0 U2 0 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 OCT PY 1992 VL 40 IS 10 BP 2677 EP 2682 DI 10.1016/0956-7151(92)90337-E PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JM229 UT WOS:A1992JM22900022 ER PT J AU FURGOL, EM AF FURGOL, EM TI SHIPS, MONEY AND POLITICS - SEAFARING AND NAVAL ENTERPRISE IN THE REIGN OF CHARLES-I - ANDREWS,KR SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP FURGOL, EM (reprint author), USN MUSEUM,WASHINGTON,DC, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER HISTORICAL REVIEW PI WASHINGTON PA 400 A ST SE, WASHINGTON, DC 20003 SN 0002-8762 J9 AM HIST REV JI Am. Hist. Rev. PD OCT PY 1992 VL 97 IS 4 BP 1213 EP 1214 DI 10.2307/2165566 PG 2 WC History SC History GA JV069 UT WOS:A1992JV06900062 ER PT J AU SAYERS, ME MAZANEC, DJ AF SAYERS, ME MAZANEC, DJ TI USE OF ANTIMALARIAL-DRUGS FOR THE TREATMENT OF PSORIATIC-ARTHRITIS SO AMERICAN JOURNAL OF MEDICINE LA English DT Note ID HYDROXYCHLOROQUINE C1 CLEVELAND CLIN EDUC FDN,CLEVELAND,OH 44106. RP SAYERS, ME (reprint author), USN HOSP,PORTSMOUTH,VA 23708, USA. NR 7 TC 17 Z9 17 U1 0 U2 0 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0002-9343 J9 AM J MED JI Am. J. Med. PD OCT PY 1992 VL 93 IS 4 BP 474 EP 475 DI 10.1016/0002-9343(92)90183-C PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA JT161 UT WOS:A1992JT16100021 PM 1415314 ER PT J AU PERDUE, PW JOHNSON, HW STAFFORD, PW AF PERDUE, PW JOHNSON, HW STAFFORD, PW TI INTESTINAL-OBSTRUCTION COMPLICATING PREGNANCY SO AMERICAN JOURNAL OF SURGERY LA English DT Article ID MIDGUT VOLVULUS; SURGERY AB Intestinal obstruction is a rare but serious complication of pregnancy with significant maternal and fetal mortality. The reported incidence of intestinal obstruction complicating pregnancy varies widely, from 1 in 66,431 to 1 in 1,500 deliveries. A retrospective review of 66 cases of intestinal obstruction complicating pregnancy and the puerperium, including 2 cases from our institution, revealed that the most common causes of mechanical obstruction were adhesions (58%), volvulus (24%), and intussusception (5%). Seventy-seven percent of the patients with obstruction due to adhesions had undergone previous abdominal or pelvic surgery. Presenting symptoms and signs were similar to those of the nonpregnant patient; abdominal pain was present in 98% of patients, vomiting in 82%, and tenderness to palpation in 71%. In 82% of patients, obstruction was evident on radiographic evaluation. Prompt management of obstruction is esssential; the median length of time from admission to laparotomy in the 66 patients was 48 hours. Bowel strangulation requiring resection was present in 23% of patients. Thirty-eight percent of patients completed term pregnancies after operative resolution of obstruction; total maternal mortality was 6%, and total fetal mortality 26%. Thus, both mother and fetus are at risk when intestinal obstruction complicates pregnancy. Clinical suspicion of the presence of obstruction and aggressive intervention are required to decrease the morbidity and mortality of this rare complication of pregnancy. C1 USN,MED CTR,DEPT GEN SURG,BETHESDA,MD 20889. USN,MED CTR,DEPT OBSTET & GYNECOL,BETHESDA,MD 20889. NR 43 TC 79 Z9 89 U1 0 U2 2 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0002-9610 J9 AM J SURG JI Am. J. Surg. PD OCT PY 1992 VL 164 IS 4 BP 384 EP 388 DI 10.1016/S0002-9610(05)80910-9 PG 5 WC Surgery SC Surgery GA JQ532 UT WOS:A1992JQ53200017 PM 1415949 ER PT J AU VANLIESHOUT, L DEJONGE, N ELMASRY, NA MANSOUR, MM KRIJGER, FW DEELDER, AM AF VANLIESHOUT, L DEJONGE, N ELMASRY, NA MANSOUR, MM KRIJGER, FW DEELDER, AM TI IMPROVED DIAGNOSTIC PERFORMANCE OF THE CIRCULATING ANTIGEN-ASSAY IN HUMAN SCHISTOSOMIASIS BY PARALLEL TESTING FOR CIRCULATING ANDODIC AND CATHODIC ANTIGENS IN SERUM AND URINE SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID ANODIC ANTIGEN; MONOCLONAL-ANTIBODIES; MANSONI; GUT; PURIFICATION; LOCALIZATION; PROTEOGLYCAN; IMMUNOASSAY; INFECTIONS; CAA AB Serum and urine levels of two Schistosoma circulating antigens, the circulating anodic antigen (CAA) and the circulating cathodic antigen (CCA), were determined by monoclonal antibody-based enzyme-linked immunosorbent assays in 56 Egyptian patients infected with S. mansoni and in 12 patients infected with both S. mansoni and S. haematobium. Both CAA and CCA could be specifically demonstrated in 82% and 88% of the serum samples and in 88% and 87% of the urine samples, respectively. While complete specificity was maintained, sensitivity was increased to a range of 91-98% by parallel use of the two circulating antigen assays, i.e., an individual with a positive titer for at least one of the assays was considered to be infected. A combination of CAA and CCA determinations in urine samples only resulted in a sensitivity of 94%. However, the highest sensitivity was achieved when the serum-CCA assay was combined with the urine-CCA assay (98%) or with the urine-CAA assay (97%). Sensitivity could not be increased further by combining more than two tests. A significant correlation was demonstrated between the level of circulating antigen and the number of parasite eggs in feces in each of the four assays. In addition, the levels of CAA and CCA in serum and urine were significantly correlated with each other. Our results indicate that diagnosis of schistosome infections by detection of circulating antigens can be significantly improved by parallel testing for multiple antigens. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. RP VANLIESHOUT, L (reprint author), LEIDEN UNIV,PARASITOL LAB,POB 9605,2300 RC LEIDEN,NETHERLANDS. RI de Jonge, Niels/A-1786-2012 NR 25 TC 53 Z9 55 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 OCT PY 1992 VL 47 IS 4 BP 463 EP 469 PG 7 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA JY570 UT WOS:A1992JY57000015 PM 1443344 ER PT J AU MORCOS, SH MANSOUR, MM KHAYYAL, MT SALEH, S ISHAK, EA GIRGIS, NI AF MORCOS, SH MANSOUR, MM KHAYYAL, MT SALEH, S ISHAK, EA GIRGIS, NI TI EVALUATION OF HEPATIC-FIBROSIS AFTER OXAMNIQUINE THERAPY OF MURINE SCHISTOSOMIASIS SO ANNALS OF TROPICAL MEDICINE AND PARASITOLOGY LA English DT Article ID PRAZIQUANTEL; MANSONI; REVERSAL C1 UNIV CAIRO,FAC PHARM,DEPT PHARMACOL,CAIRO,EGYPT. RP MORCOS, SH (reprint author), USN,MED RES UNIT 3,CODE 302,PSC 452,BOX 5000,FPO,CAIRO,EGYPT. NR 19 TC 3 Z9 3 U1 0 U2 0 PU CARFAX PUBL CO PI ABINGDON PA PO BOX 25, ABINGDON, OXFORDSHIRE, ENGLAND OX14 3UE SN 0003-4983 J9 ANN TROP MED PARASIT JI Ann. Trop. Med. Parasitol. PD OCT PY 1992 VL 86 IS 5 BP 511 EP 516 PG 6 WC Public, Environmental & Occupational Health; Parasitology; Tropical Medicine SC Public, Environmental & Occupational Health; Parasitology; Tropical Medicine GA KE887 UT WOS:A1992KE88700008 PM 1288432 ER PT J AU BLIGH, ME BHAGWAT, S THOMAS, J CASTONGUAY, TW AF BLIGH, ME BHAGWAT, S THOMAS, J CASTONGUAY, TW TI COLD-EXPOSURE, STARVATION AND THEIR COMBINED EFFECTS ON CIRCULATING ALDOSTERONE AND CORTICOSTERONE CONCENTRATIONS IN SELF-SELECTING SPRAGUE-DAWLEY RATS SO APPETITE LA English DT Meeting Abstract C1 UNIV MARYLAND,DEPT HUMAN NUTR & FOOD SYST,COLL PK,MD 20742. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0195-6663 J9 APPETITE JI Appetite PD OCT PY 1992 VL 19 IS 2 BP 169 EP 169 DI 10.1016/0195-6663(92)90039-9 PG 1 WC Behavioral Sciences; Nutrition & Dietetics SC Behavioral Sciences; Nutrition & Dietetics GA JX156 UT WOS:A1992JX15600027 ER PT J AU ULMER, MP WIRTH, GD KOWALSKI, MP AF ULMER, MP WIRTH, GD KOWALSKI, MP TI CLUSTERS IN COLLISION SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, CLUSTERING; X-RAYS, GALAXIES ID X-RAY; BOUND POPULATIONS; CD GALAXIES; PERSEUS CLUSTER; RICH CLUSTERS; SUBSTRUCTURE; SATELLITE; RADIUS; RATIO; FLUX AB We have determined the positions of the optical and X-ray centers in 13 rich galaxy clusters studied by Dressler. We tested the accuracy and precision of four methods for determining cluster centers: nearest-neighbor density, mean, median, and density-weighted mean; the last two proved superior. With the use of bootstrap resampling to obtain accurate confidence intervals on the positions of the centers, we have quantified the significance of the X-ray/optical offsets. Insignificant offsets were found in Abell 119, 154, 376, 400, 539, 1656, 1991, 2063, and 2634. The offset previously found by Snyder et al. in the Perseus cluster (Abell 426) was reproduced in our study but found to be only marginally significant, as were the offsets in Abell 754 and 2256. Abell 168 exhibits an apparently real discrepancy between its visible and X-ray centers, which we interpret as evidence that this cluster (and by implication other clusters) resulted from the collision of two approximately equal sized clusters. C1 UNIV CALIF SANTA CRUZ,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP ULMER, MP (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,2145 SHERIDAN RD,EVANSTON,IL 60208, USA. NR 36 TC 21 Z9 21 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 1 PY 1992 VL 397 IS 2 BP 430 EP 437 DI 10.1086/171798 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JQ075 UT WOS:A1992JQ07500007 ER PT J AU HILLENBRAND, LA STROM, SE VRBA, FJ KEENE, J AF HILLENBRAND, LA STROM, SE VRBA, FJ KEENE, J TI HERBIG AE/BE STARS - INTERMEDIATE-MASS STARS SURROUNDED BY MASSIVE CIRCUMSTELLAR ACCRETION DISKS SO ASTROPHYSICAL JOURNAL LA English DT Review ID T-TAURI STARS; MAIN-SEQUENCE STARS; AE-BE STARS; YOUNG STELLAR OBJECTS; DARK-CLOUD COMPLEXES; FU-ORIONIS STARS; INFRARED OBSERVATIONS; ROTATIONAL VELOCITIES; INTRINSIC COLORS; FORBIDDEN LINES AB The hypothesis that Herbig Ae/Be stars are young stars of intermediate mass (1.5 < M*/M. < 10) surrounded by circumstellar accretion disks is examined. Analysis of the spectral energy distributions for 47 cataloged Herbig Ae/Be stars leads to their classification into three groups. Group I includes 30 stars with large infrared (IR) excesses characterized by spectral slopes lambdaF(lambda) approximately lambda-4/3. Infrared spectral energy distributions (lambda greater-than-or-similar-to 2.2 mum) for these objects can be well fitted by assuming that excess emission above photospheric levels arises in a geometrically flat, optically thick circumstellar accretion disk. The inner regions of these accretion disks (from the stellar surface to a distance of several stellar radii) must be optically thin in order to account for distinctive inflections in their observed near-infrared (1.2 mum less-than-or-similar-to lambda less-than-or-similar-to 2.2 mum) spectral energy distributions. Group II includes 11 objects with flat or rising infrared spectra. These objects appear best interpreted as young, intermediate-mass stars or star/disk systems surrounded by gas and dust which is not confined to a disk. Indirect arguments suggest that most of these systems may be viewed through remnant infalling envelopes and, if so, might be regarded as the evolutionary precursors of the group I objects. Group III consists of six stars with small infrared excesses, whose infrared spectral energy distributions appear similar to those of classical Be stars in which modest excesses above photospheric levels seem to arise from free-free emission in a gaseous circumstellar disk or envelope. Nevertheless, their association with star-forming molecular clouds and their proximity to other young stars suggests that they are young, intermediate-mass stars which lack disks and which may be analogs of diskless T Tauri stars. Basic disk parameters for the group I objects are derived from extant optical and infrared photometry and from newly measured millimeter continuum flux densities: masses for the disks (along with any remnant envelope material contained within the millimeter-antenna beam) are in the range 0.01 < M(disk)/M. < 6; lower limits to outer disk radii are in the range 15 < R(disk)/AU < 175; inner optically thin disk regions have radii 3 < R(hole)/R* < 25; disk accretion luminosities are in the range 12 < L(acc)/L. < 1800, while the deduced disk mass accretion rates are in the range 6 x 10(-7) < M(acc) < 8 x 10(-5) M. yr-1. Derived Balmer line luminosities for the group I objects correlate well with our accretion luminosities and extend the relationships between these quantities derived for T Tauri stars. The group I Herbig Ae/Be stars thus appear to be the intermediate-mass analogs of T Tauri stars, whose unusual photometric and spectroscopic properties are believed to derive from a variety of physical processes (e.g., winds, boundary-layer emission) linked to the presence of a circumstellar accretion disk. If disk material arrives on the stellar surface at the derived rates (M(acc)) throughout the pre-main-sequence lifetime of an intermediate-mass star, then a significant fraction of the mass comprising the star must pass through a disk. Moreover, because the disk accretion luminosity can be comparable to or greater than the stellar luminosity, the energy input to the star by accreting disk material may be sufficient in many cases to alter the pre-main-sequence evolutionary paths followed by these intermediate-mass stars. Finally, it is noteworthy that among the Herbig Ae/Be stars, disk accretion rates and possibly envelope infall rates appear to be higher for stars of higher mass. This result may represent an important step toward understanding the protostellar core initial conditions which determine infall and accretion rates, and ultimately the stellar mass formed from collapsing core material. C1 USN OBSERV,FLAGSTAFF STN,FLAGSTAFF,AZ 86002. CALTECH,DEPT PHYS,PASADENA,CA 91125. RP HILLENBRAND, LA (reprint author), UNIV MASSACHUSETTS,FIVE COLL ASTRON DEPT,DEPT PHYS & ASTRON,LGRC517G,AMHERST,MA 01002, USA. NR 127 TC 633 Z9 634 U1 1 U2 10 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 1 PY 1992 VL 397 IS 2 BP 613 EP 643 DI 10.1086/171819 PN 1 PG 31 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JQ075 UT WOS:A1992JQ07500028 ER PT J AU BANTA, GR BRAUN, DE AF BANTA, GR BRAUN, DE TI HEAT STRAIN DURING AT-SEA HELICOPTER OPERATIONS AND THE EFFECT OF PASSIVE MICROCLIMATE COOLING SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID COCKPIT AB Twelve Navy H-3 helicopter aircrew members were monitored (heart rate, skin and rectal temperatures) in both microclimate cooling (ice) vest and non-vest conditions during at-sea operations in the high heat environment of the Persian Gulf. During all flights and f light phases, ambient dry bulb temperatures ranged from 31.0-degrees-C (in-flight) to 48.6-degrees-C (hover). Heart rate was greatest during hover and on-deck (range: 89.9 to 145.0 beats/min) without an ice vest, yet was significantly reduced with ice (range: 79.7 to 86.0 beats/min) (p < 0.05). Rectal temperature was not found to be different between vest and non-vest conditions; however, change across flight phases in both conditions was significant (p < 0.05). Analysis of variance demonstrated significantly lower mean weighted skin temperatures (p < 0.05) when wearing the ice vest. These data suggest that wearing a protective cooling vest can reduce the heat strain associated with helicopter flight in high heat environments. RP BANTA, GR (reprint author), USN,HLTH RES CTR,DEPT PHYSIOL PERFORMANCE & OPERAT MED,MED SERV CORPS,POB 85122,SAN DIEGO,CA 92186, USA. NR 23 TC 16 Z9 16 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 OCT PY 1992 VL 63 IS 10 BP 881 EP 885 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA JQ395 UT WOS:A1992JQ39500005 PM 1417650 ER PT J AU CLARK, JB RUPERT, AH AF CLARK, JB RUPERT, AH TI SPATIAL DISORIENTATION AND DYSFUNCTION OF ORIENTATION EQUILIBRIUM REFLEXES - AEROMEDICAL EVALUATION AND CONSIDERATIONS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID VESTIBULO-OCULAR REFLEX; OSCILLOPSIA AB Loss of spatial awareness has been implicated as a direct causal factor in 4-10% of serious aircraft mishaps and 10-20% of fatal aircraft mishaps (7). Spatial disorientation in flight usually results from misperception of visual, vestibular, or proprioceptive cues. Pathologic causes have rarely been implicated. A student naval aviator with recurrent loss of spatial awareness due to a defective vestibulo-ocular reflex (VOR), presumably from vestibular neuronitis in adolescence, is reported. His chief complaint, an inability to focus an the instrument panel during turbulent instrument meteorological conditions (IMC), resulted in spatial disorientation and adverse flight attitude. A simple test of visual-vestibular interaction, the dynamic visual acuity test, could identify a defective vestibulo-ocular reflex in aviation personnel. An absent or defective vestibulo-ocular reflex has potential for disorientation in instrument flight. A comprehensive vestibular function test battery is indicated in individuals with recurrent or overwhelming spatial disorientation who fail a screening dynamic visual acuity test. The aeromedical disposition of vertigo and dysequilibrium is discussed. C1 USN,AEROSPACE MED INST,DEPT NEUROL,PENSACOLA,FL. USN,AEROSPACE MED RES LAB,PENSACOLA,FL. OI Clark, Jonathan/0000-0002-1162-1238 NR 21 TC 13 Z9 13 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 OCT PY 1992 VL 63 IS 10 BP 914 EP 918 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA JQ395 UT WOS:A1992JQ39500011 PM 1417656 ER PT J AU DAVIES, MA HUBNER, W BLUME, A MENDELSOHN, R AF DAVIES, MA HUBNER, W BLUME, A MENDELSOHN, R TI ACYL CHAIN CONFORMATIONAL ORDERING IN 1,2 DIPALMITOYLPHOSPHATIDYLETHANOLAMINE - INTEGRATION OF FT-IR AND H-2 NMR RESULTS SO BIOPHYSICAL JOURNAL LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; PHOSPHOLIPID-MEMBRANES; PHASE-BEHAVIOR; BILAYERS; DISORDER; PHOSPHATIDYLETHANOLAMINE; SPECTROSCOPY; CHOLESTEROL; MIXTURES; DYNAMICS AB The extent of trans-gauche isomerization at the 4 and 4' positions of the acyl chains of fully hydrated 4,4,4',4'-d4 1,2-dipalmitoylphosphatidylethanolamine (4-d4 DPPE) bilayers was quantitatively evaluated from the infrared (IR) intensity of the CD2 rocking modes. About 20% gauche conformers were observed at 72-degrees-C (above T(m)), while at 23-degrees-C, well below T(m), about 4% were noted. The order parameter S(C-D) was determined from H-2 nuclear magnetic resonance (NMR) quadrupolar splittings. S(C-D)) is the product of a segmental order parameter (S(gamma)), which depends on conformational order, and a chain order parameter (S(alpha)) which depends on slower motions such as chain wobble. The IR-determined percentage of gauche forms was converted into a segmental order parameter and factored out of the measured value for S(C-D) to yield an estimate of S(alpha) = 0.59 for L(alpha) phase DPPE. A comparison with S(alpha) for 1,2 dipalmitoylphosphatidylcholine (DPPC) suggests that increased wobble is responsible for enhanced motional averaging of the quadrupolar splittings in the latter at a similar reduced temperature. The extent of conformational disordering [at the 4(4') position] is essentially unchanged between the two molecules. The current study demonstrates the advantage of integrating quantitative IR with H-2 NMR data, for elucidation of the contributions of the individual motions that average the NMR quadrupolar splittings. C1 RUTGERS STATE UNIV,NEWARK COLL ARTS & SCI,DEPT CHEM,NEWARK,NJ 07102. GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM & MOLEC BIOL,WASHINGTON,DC 20007. USN,RES LAB,DEPT BIOMOLEC ENGN,WASHINGTON,DC 20375. UNIV FREIBURG,INST PHYS CHEM,W-7800 FREIBURG,GERMANY. UNIV KAISERSLAUTERN,FACHBEREICH CHEM,W-6750 KAISERSLAUTERN,GERMANY. FU NIGMS NIH HHS [GM 29864] NR 20 TC 22 Z9 22 U1 0 U2 6 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD OCT PY 1992 VL 63 IS 4 BP 1059 EP 1062 PG 4 WC Biophysics SC Biophysics GA JU251 UT WOS:A1992JU25100020 PM 1420924 ER PT J AU HUNT, BR SAUER, T YORKE, JA AF HUNT, BR SAUER, T YORKE, JA TI PREVALENCE - A TRANSLATION-INVARIANT ALMOST EVERY ON INFINITE-DIMENSIONAL SPACES SO BULLETIN OF THE AMERICAN MATHEMATICAL SOCIETY LA English DT Article ID SINKS AB We present a measure-theoretic condition for a property to hold "almost everywhere" on an infinite-dimensional vector space, with particular emphasis on function spaces such as C(k) and L(p) . Like the concept of "Lebesgue almost every" on finite-dimensional spaces, our notion of "prevalence" is translation invariant. Instead of using a specific measure on the entire space, we define prevalence in terms of the class of all probability measures with compact support. Prevalence is a more appropriate condition than the topological concepts of "open and dense" or "generic" when one desires a probabilistic result on the likelihood of a given property on a function space. We give several examples of properties which hold "almost everywhere" in the sense of prevalence. For instance, we prove that almost every C1 map on R(n) has the property that all of its periodic orbits are hyperbolic. C1 USN,CTR SURFACE WARFARE,INFORMAT & MATH SCI BRANCH,SILVER SPRING,MD 20903. GEORGE MASON UNIV,DEPT MATH SCI,FAIRFAX,VA 22030. RI Sauer, Timothy/H-8272-2012; Hunt, Brian/J-6895-2012 OI Sauer, Timothy/0000-0002-8501-8722; NR 35 TC 169 Z9 173 U1 0 U2 0 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0273-0979 J9 B AM MATH SOC JI Bull. Amer. Math. Soc. PD OCT PY 1992 VL 27 IS 2 BP 217 EP 238 DI 10.1090/S0273-0979-1992-00328-2 PG 22 WC Mathematics SC Mathematics GA JP536 UT WOS:A1992JP53600002 ER PT J AU JARRETT, T AF JARRETT, T TI THE INTERNATIONAL STATION METEOROLOGICAL CLIMATE SUMMARY CD-ROM SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article AB The International Station Meteorological Climate Summary (ISMCS) is a Compact Disc-Read Only Memory (CD-ROM) containing climatic records for 640 primary weather-observation sites and over 5800 secondary sites around the world. When used with a personal computer (PC) equipped with a CD-ROM drive, the ISMCS provides convenient access to the equivalent of 250 000 pages of climatic tables. The ISMCS was developed at the Federal Climate Complex in Asheville, North Carolina, as part of an ongoing effort to distribute the massive climatic database maintained there. Although the access software included on the ISMCS is written for a DOS PC, methods to access the ISMCS data files from UNIX computers are being developed. RP JARRETT, T (reprint author), USN,RES LAB,DIV MARINE METEOROL,MONTEREY,CA, USA. NR 2 TC 0 Z9 0 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 OCT PY 1992 VL 73 IS 10 BP 1578 EP 1580 DI 10.1175/1520-0477(1992)073<1578:TISMCS>2.0.CO;2 PG 3 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JV506 UT WOS:A1992JV50600005 ER PT J AU BROWN, JA ROBERTS, CS AF BROWN, JA ROBERTS, CS TI ELEVATED SERUM ALPHA-FETOPROTEIN LEVELS IN PRIMARY GALLBLADDER CARCINOMA WITHOUT HEPATIC INVOLVEMENT SO CANCER LA English DT Article DE GALLBLADDER; CARCINOMA; ALPHA-FETOPROTEIN; TUMOR MARKERS AB Background. Elevated serum alpha-fetoprotein (AFP) levels, although frequently associated with hepatocellular carcinoma, have also been reported in cases of primary gallbladder carcinoma. Methods. The case of a 56-year-old man with a markedly elevated serum AFP level and primary gallbladder carcinoma without detectable hepatic involvement is reported. Results. The patient had right upper quadrant abdominal pain and a palpable right upper quadrant mass. Computerized tomography scan of the abdomen showed a large, subhepatic mass consistent with the gallbladder, and normal liver parenchyma. Liver enzyme levels were normal. Management included cholecystectomy followed by postoperative radiation therapy to the gallbladder bed and portal areas and systemic chemotherapy. At the end of therapy, the AFP level had returned to normal. Conclusions. Gallbladder carcinoma is rarely diagnosed before surgery, which sometimes inhibits operative planning. AFP may be a useful preoperative tumor marker in differentiating the patient with primary gallbladder carcinoma from the patient with gallbladder hydrops. C1 MED UNIV S CAROLINA,DEPT SURG,CHARLESTON,SC 29425. RP BROWN, JA (reprint author), USN HOSP,DEPT SURG,CHARLESTON,SC 29408, USA. NR 5 TC 14 Z9 14 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 0008-543X J9 CANCER JI Cancer PD OCT 1 PY 1992 VL 70 IS 7 BP 1838 EP 1840 DI 10.1002/1097-0142(19921001)70:7<1838::AID-CNCR2820700705>3.0.CO;2-G PG 3 WC Oncology SC Oncology GA JP692 UT WOS:A1992JP69200004 PM 1381989 ER PT J AU GARFINKEL, A DITTO, WL SPANO, ML WEISS, JN AF GARFINKEL, A DITTO, WL SPANO, ML WEISS, JN TI CONTROL OF CARDIAC CHAOS SO CIRCULATION LA English DT Meeting Abstract C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. COLL WOOSTER,WOOSTER,OH 44691. COLL WOOSTER,WOOSTER,OH 44691. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910. RI Spano, Mark/B-6883-2011 NR 0 TC 3 Z9 3 U1 0 U2 2 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 217 EP 217 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66000888 ER PT J AU BUCHBINDER, M REISMAN, M FENNER, J GIBB, MD AF BUCHBINDER, M REISMAN, M FENNER, J GIBB, MD TI HIGH-SPEED ROTATIONAL ABLATION IN COMPLEX CALCIFIED LESIONS SO CIRCULATION LA English DT Meeting Abstract C1 UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92103. USN HOSP,SAN DIEGO,CA 92134. NR 0 TC 6 Z9 6 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1992 VL 86 IS 4 SU S BP 513 EP 513 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA JT660 UT WOS:A1992JT66002059 ER PT J AU JORDAN, SA AF JORDAN, SA TI AN ITERATIVE SCHEME FOR NUMERICAL-SOLUTION OF STEADY INCOMPRESSIBLE VISCOUS FLOWS SO COMPUTERS & FLUIDS LA English DT Article ID EQUATIONS AB An iterative solution scheme is proposed for application to steady incompressible viscous flows in simple and complex geometries. The iterative scheme solves the vorticity-stream function form of the Navier-Stokes equations in generalized curvilinear coordinates. The flow system of equations are cast into a Newton's iterative form which are solved using the modified strongly implicit procedure. The solution scheme is benchmarked using two test cases, namely: a shear-driven steady laminar flow in a square cavity; and a simple laminar flow in a complex expanding channel. The iterative process to steady-state convergence in both test cases is highly stable and the convergence rate is without spurious oscillations. At convergence, the flow solutions are second-order accurate. RP JORDAN, SA (reprint author), USN,UNDERSEA WARFARE CTR,CODE 8322,BLDG 1246,NEWPORT,RI 02841, USA. NR 24 TC 6 Z9 6 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7930 J9 COMPUT FLUIDS JI Comput. Fluids PD OCT PY 1992 VL 21 IS 4 BP 503 EP 517 DI 10.1016/0045-7930(92)90003-E PG 15 WC Computer Science, Interdisciplinary Applications; Mechanics SC Computer Science; Mechanics GA JN554 UT WOS:A1992JN55400003 ER PT J AU GIBB, MD BUCHBINDER, M AF GIBB, MD BUCHBINDER, M TI HIGH-SPEED CORONARY ROTATIONAL ABLATION SO CORONARY ARTERY DISEASE LA English DT Review DE ATHERECTOMY; ROTATIONAL ABLATION; ANGIOPLASTY ID ANGIOPLASTY; ATHERECTOMY; RESTENOSIS C1 UNIV CALIF SAN DIEGO,USN HOSP,MED CTR,DIV CARDIOL,225 DICKINSON ST,SAN DIEGO,CA 92103. NR 18 TC 1 Z9 1 U1 0 U2 0 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0954-6928 J9 CORONARY ARTERY DIS JI Coronary Artery Dis. PD OCT PY 1992 VL 3 IS 10 BP 908 EP 913 PG 6 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA JT715 UT WOS:A1992JT71500006 ER PT J AU BOWLING, LS AMUNDSON, DE AF BOWLING, LS AMUNDSON, DE TI ARE EJECTION FRACTIONS BASED ON REGRESSION EQUATIONS FOR SYSTOLIC-TIME RATIOS RELIABLE SO CRITICAL CARE MEDICINE LA English DT Article DE SYSTOLIC TIME INTERVAL; VENTRICULAR EJECTION FRACTION; LEFT VENTRICULAR FUNCTION; CARDIOGRAPHY, IMPEDANCE; STROKE VOLUME; CARDIAC OUTPUT; CARDIOLOGY ID INTERVALS; DISEASE C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134. USN HOSP,DEPT CRIT CARE MED,SAN DIEGO,CA 92134. NR 6 TC 1 Z9 1 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0090-3493 J9 CRIT CARE MED JI Crit. Care Med. PD OCT PY 1992 VL 20 IS 10 BP 1459 EP 1460 DI 10.1097/00003246-199210000-00016 PG 2 WC Critical Care Medicine SC General & Internal Medicine GA JT937 UT WOS:A1992JT93700016 PM 1395669 ER PT J AU SILBERNAGEL, M KUEPPER, T AF SILBERNAGEL, M KUEPPER, T TI EVALUATION OF A PRESSURE BOOSTING PUMP TURBINE DEVICE FOR REVERSE-OSMOSIS ENERGY RECOVERY - EXTENDED TESTING ON A SEAWATER DESALINATION SYSTEM SO DESALINATION LA English DT Article; Proceedings Paper CT 1992 BIENNIAL CONF OF THE NATIONAL WATER SUPPLY IMPROVEMENT ASSOC - DESALTING AND RECYCLING : MEETING TODAYS WATER CHALLENGES CY AUG 23-27, 1992 CL NEWPORT BEACH, CA SP NATL WATER SUPPLY IMPROVEMENT ASSOC AB The energy recovery device tested is a freely running turbine driven centrifugal pump used to recover the brine stream hydraulic energy in reverse osmosis (RO) systems and to transfer that energy in the form of a pressure boost to the feed stream. Features of the energy recovery (ER) device include extremely compact size, simple installation, and ease of operation. The Naval Civil Engineering Laboratory (NCEL) operates the Seawater Desalination Test Facility located at Port Hueneme, California, where various energy recovery devices have undergone extensive performance testing relative to a military 600 gallon per hour (gph) Reverse Osmosis Water Purification Unit (ROWPU). One particular device tested has a brine-driven single stage turbine, and feed pressure boosting single stage centrifugal pump joined together by a common shaft. To date, this ER. device has operated over 3,000 hours with periodic measurements of performance parameters and internal inspections of the unit to characterize rates of wear. C1 PUMP ENGN INC,MONROE,MI. RP SILBERNAGEL, M (reprint author), USN,CIVIL ENGN LAB,PORT HUENEME,CA, USA. NR 2 TC 2 Z9 2 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0011-9164 J9 DESALINATION JI Desalination PD OCT PY 1992 VL 88 IS 1-3 BP 311 EP 319 DI 10.1016/0011-9164(92)80123-Q PG 9 WC Engineering, Chemical; Water Resources SC Engineering; Water Resources GA KB656 UT WOS:A1992KB65600021 ER PT J AU ROHR, JJ ANDERSEN, GW REIDY, LW HENDRICKS, EW AF ROHR, JJ ANDERSEN, GW REIDY, LW HENDRICKS, EW TI A COMPARISON OF THE DRAG-REDUCING BENEFITS OF RIBLETS IN INTERNAL AND EXTERNAL FLOWS SO EXPERIMENTS IN FLUIDS LA English DT Article ID TURBULENT BOUNDARY-LAYERS; REDUCTION; TRANSITION; PIPES AB Equivalent drag-reducing performance is observed with 3 M riblets in fully developed internal (pipe) and developing external (flat plate) flows. Drag reduction begins around h+ = 3, peaks between 6 and 9% at about h+ = 12, and becomes zero for a value of h+ between 20 and 30. In laminar pipe flow no significant change in drag is observed with the 3 M riblets present. At high Reynolds numbers, after exhibiting fully rough behaviour, friction factors for the 3 M riblets are observed to monotonically decrease with increasing Reynolds number. RP ROHR, JJ (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 37 TC 23 Z9 24 U1 0 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD OCT PY 1992 VL 13 IS 6 BP 361 EP 368 PG 8 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA JV719 UT WOS:A1992JV71900001 ER PT J AU MILLER, WG AF MILLER, WG TI AN INVESTIGATION OF BOTTLE-NOSED-DOLPHIN TURSIOPS-TRUNCATUS DEATHS IN EAST MATAGORDA BAY, TEXAS, JANUARY 1990 SO FISHERY BULLETIN LA English DT Note RP MILLER, WG (reprint author), USN,CTR OCEAN SYST,CODE 514,SAN DIEGO,CA 92152, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU NATL MARINE FISHERIES SERVICE SCIENTIFIC PUBL OFFICE PI SEATTLE PA 7600 SAND POINT WAY NE BIN C15700, SEATTLE, WA 98115 SN 0090-0656 J9 FISH B-NOAA JI Fish. Bull. PD OCT PY 1992 VL 90 IS 4 BP 791 EP 797 PG 7 WC Fisheries SC Fisheries GA KQ944 UT WOS:A1992KQ94400017 ER PT J AU OWEN, G WINTER, E AF OWEN, G WINTER, E TI THE MULTILINEAR EXTENSION AND THE COALITION STRUCTURE VALUE SO GAMES AND ECONOMIC BEHAVIOR LA English DT Article C1 UNIV BONN,DEPT ECON,W-5300 BONN,GERMANY. UNIV PITTSBURGH,DEPT ECON,PITTSBURGH,PA 15260. RP OWEN, G (reprint author), USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93940, USA. NR 7 TC 20 Z9 20 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 0899-8256 J9 GAME ECON BEHAV JI Games Econ. Behav. PD OCT PY 1992 VL 4 IS 4 BP 582 EP 587 DI 10.1016/0899-8256(92)90038-T PG 6 WC Economics SC Business & Economics GA JV077 UT WOS:A1992JV07700006 ER PT J AU CARBONE, D AF CARBONE, D TI THE P53 KNOCKOUT - GONE BUT NOT FORGOTTEN SO HEPATOLOGY LA English DT Note RP CARBONE, D (reprint author), USN,MED ONCOL BRANCH,NCI,BETHESDA,MD 20899, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0270-9139 J9 HEPATOLOGY JI Hepatology PD OCT PY 1992 VL 16 IS 4 BP 1094 EP 1096 DI 10.1002/hep.1840160439 PG 3 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA JR883 UT WOS:A1992JR88300038 PM 1398492 ER PT J AU MILLER, W MCKENNA, T LAU, C AF MILLER, W MCKENNA, T LAU, C TI OFFICE OF NAVAL RESEARCH CONTRIBUTIONS TO NEURAL NETWORKS AND SIGNAL-PROCESSING IN OCEANIC ENGINEERING SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article AB Research supported by the Office of Naval Research (ONR) has produced many of the key neural network and signal processing tools being applied to real world engineering problems today. The Navy is vitally interested in applications of neural nets. This is reflected by the fact that six different Navy laboratories, numerous universities, and many commercial companies are currently pursuing naval applications of neural networks as diverse as acoustic signal detection, active acoustic signal detection and classification, real-time, on-line machinery fault detection and analysis, image processing and identification, intelligent control for autonomous underwater vehicles, and automatic target recognition. This paper summarizes many of the highlights and accomplishments of ONR's neural network basic research programs and shares a bit of the historical perspective that serves as a source of pride in the world of Navy science and technology-the long term support and resulting payoff of Navy sponsored research in the broad field of neural networks. In addition, we will survey the significant challenges that must be overcome before neural network applications will become widely available to the Navy community. C1 USN,OFF NAVAL RES,DIV ELECTR,ARLINGTON,VA 22217. RP MILLER, W (reprint author), USN,OFF NAVAL RES,DIV COGNIT & NEURAL SCI,COMPUTAT NEUROSCI PROGRAM,ARLINGTON,VA 22217, USA. NR 33 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1992 VL 17 IS 4 BP 299 EP 307 DI 10.1109/48.180298 PG 9 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA JW838 UT WOS:A1992JW83800002 ER PT J AU SPEIDEL, SL AF SPEIDEL, SL TI NEURAL ADAPTIVE SENSORY PROCESSING FOR UNDERSEA SONAR SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article AB Neural adaptive beamformers (NABF's) utilize neural paradigms to accomplish desired adaptions that are associated with sensory-field-responsive partitioning and selection processes. Kohonen-type organization and Hopfield-type optimization have been formulated as NABF mechanisms and have been applied to test data. Formulations and results are included. NABF's are also used in conjunction with a learning network for interpretation of weight sets as population codings of direction. An example is included. Finally, desirable qualities of human auditory response are being interpreted in the context of neural adaptive beamforming for the purpose of creating an integrated processing structure that incorporates NABF's, a cochlear model, and an associative memory as part of a total spatio-temporal processing scheme for selective attention. RP SPEIDEL, SL (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152, USA. NR 19 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1992 VL 17 IS 4 BP 341 EP 350 DI 10.1109/48.180303 PG 10 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA JW838 UT WOS:A1992JW83800007 ER EF