FN Thomson Reuters Web of Science™ VR 1.0 PT J AU WELCH, DO AF WELCH, DO TI HIGH-TEMPERATURE SUPERCONDUCTIVITY - TUNSTALL,DP, BARFORD,W SO SCIENCE LA English DT Book Review RP WELCH, DO (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV MAT SCI,UPTON,NY 11973, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD DEC 4 PY 1992 VL 258 IS 5088 BP 1672 EP 1673 DI 10.1126/science.258.5088.1672 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KA896 UT WOS:A1992KA89600045 PM 17742540 ER PT J AU DERI, RJ WELTER, R PENNINGS, ECM CANEAU, C JACKEL, JL HAWKINS, RJ JOHNSON, JJ GILCHRIST, H GIBBONS, C AF DERI, RJ WELTER, R PENNINGS, ECM CANEAU, C JACKEL, JL HAWKINS, RJ JOHNSON, JJ GILCHRIST, H GIBBONS, C TI HIGH-SPEED HETERODYNE OPERATION OF MONOLITHICALLY INTEGRATED BALANCED, POLARIZATION DIVERSITY PHOTODETECTORS SO ELECTRONICS LETTERS LA English DT Article DE PHOTODETECTORS; INTEGRATED OPTOELECTRONICS; OPTICAL RECEIVERS ID INP SUBSTRATE; RECEIVER; PHOTODIODES AB The Letter demonstrates that monolithically integrated photodetector chips with optical couplers can provide high speed heterodyne detection (6.3 GHz bandwidth) of optical signals at 1540 nm wavelength. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP DERI, RJ (reprint author), BELLCORE,331 NEWMAN SPRINGS RD,RED BANK,NJ 07701, USA. NR 13 TC 7 Z9 7 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 DEC 3 PY 1992 VL 28 IS 25 BP 2332 EP 2334 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA KD325 UT WOS:A1992KD32500047 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEY, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS 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HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALA, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, W RIND, O RIZVI, HA RODRIGUEZ, FJ ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEY, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCK, R BOHM, A BORGIA, B BOSETI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, M CHEN, WY CHIEFARI, G CHIEN, CY CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DJAMBAZOV, L DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOUGAS, A GOUJON, D GRATTA, G GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HE, JT HEBBEKER, T HEBERT, M HERTEN, G HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGGETT, C LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LEYTENS, X LI, C LI, HT LI, PJ LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASCALA, G PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUS, C PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V POSTEMA, H QI, ZD QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, W RIND, O RIZVI, HA RODRIGUEZ, FJ ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUN, LZ SUTER, H SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, C WANG, CR WANG, GH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, SX WYSLOUCH, B XIE, YY XU, JG XU, ZZ XUE, ZL YAN, DS YANG, BZ YANG, CG YANG, G YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, GJ ZHOU, JF ZHU, RY ZICHICHI, A VANDERZWAAN, BCC TI HIGH MASS PHOTON PAIRS IN L+L-GAMMA-GAMMA EVENTS AT LEP SO PHYSICS LETTERS B LA English DT Article AB From the analysis of the reactions e+e- --> l+l- (ngamma) (l = e,mu, tau) we observe four events, one e+e-gammagamma and three mu +mu - gammagamma, with the invariant mass of the photon pairs close to 60 GeV. These events were selected from a data sample collected in the L3 detector corresponding to 950000 produced Z0's. More data are necessary to ascertain the origin of these events. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. INFN, SEZ NAPOLI, I-80125 NAPLES, ITALY. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. INFN, SEZ PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. ETH ZURICH, CH-8093 ZURICH, SWITZERLAND. NUCL PHYS INST, ST PETERSBURG, USSR. MIT, CAMBRIDGE, MA 02139 USA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. 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LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. UNIV LYON 1, INST PHYS NUCL LYON, IN2P3, CNRS, F-69622 VILLEURBANNE, FRANCE. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. CALTECH, PASADENA, CA 91125 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. RP ADRIANI, O (reprint author), INFN, SEZ FIRENZE, I-50125 FLORENCE, ITALY. RI Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016 OI Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152 NR 14 TC 42 Z9 42 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. 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PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, W RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, L VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDELZWAAN, BCC TI SEARCH FOR ISOSINGLET NEUTRAL HEAVY-LEPTONS IN Z0 DECAYS SO PHYSICS LETTERS B LA English DT Article ID RADIATIVE-CORRECTIONS; PHOTON CORRECTIONS; BHABHA SCATTERING; HIGH-ENERGIES; MONTE-CARLO; LIMITS; MASS AB We search for neutral heavy leptons that are isosinglets under the standard SU(2)L gauge group. Such neutral heavy leptons are expected in many extensions of the standard model. Three types of heavy leptons Ne, N(mu), N(tau) associated with the three neutrino types nu(e), nu(mu), nu(tau) have been directly searched for and no evidence for a signal has been found. We set the limit Br(Z0 --> nu(l)N(l)) < 3 x 10(-5) at the 95% CL for the mass range from 3 GeV up to m(Z). C1 CTR INVEST ENERGETICAS MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. INFN, SEZ NAPOLI, I-80125 NAPLES, ITALY. INFN, SEZ PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. ST PETERSBURG NUCL PHYS INST, ST PETERSBURG, USSR. UNIV FLORENCE, I-50125 FLORENCE, ITALY. BOSTON UNIV, BOSTON, MA 02215 USA. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. UNIV PERUGIA, I-06100 PERUGIA, ITALY. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. MOSCOW THEORET & EXPTL PHYS INST, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. CALTECH, PASADENA, CA 91125 USA. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. INFN, SEZ ROMA, I-00185 ROME, ITALY. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. INFN, SEZ MILANO, I-20133 MILAN, ITALY. IN2P3, LAB ANNECY VIEUX PHYS PARTICULES, CNRS, F-74941 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. UNIV LYON 1, IN2P3, INST PHYS NUCL LYON, CNRS, F-69622 VILLEURBANNE, FRANCE. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CHINESE UNIV SCI & TECHNOL, HEFEI 230029, PEOPLES R CHINA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), INFN, SEZ FIRENZE, I-50125 FLORENCE, ITALY. RI Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Kamyshkov, Yuri/J-7999-2016; Tsaregorodtsev, Andrei/E-3873-2016; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; D'Alessandro, Raffaello/F-5897-2015; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; OI Chmeissani, Mokhtar/0000-0002-2287-4791; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Kamyshkov, Yuri/0000-0002-3789-7152; Longo, Egidio/0000-0001-6238-6787; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; D'Alessandro, Raffaello/0000-0001-7997-0306; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247 NR 32 TC 76 Z9 76 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD DEC 3 PY 1992 VL 295 IS 3-4 BP 371 EP 382 DI 10.1016/0370-2693(92)91579-X PG 12 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB801 UT WOS:A1992KB80100028 ER PT J AU ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, G BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CIUCHINI, M CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSMO, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DELGIUDICE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DIAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOYATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, C HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALKKINEN, J KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETROVYKH, L PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHULZE, B SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, IG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WALDNER, F WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J AF ABREU, P ADAM, W ADYE, T AGASI, E ALEKSEEV, GD ALGERI, A ALLEN, P ALMEHED, S ALVSVAAG, SJ AMALDI, U ANASSONTZIS, EG ANDREAZZA, A ANTILOGUS, P APEL, WD APSIMON, RJ ASMAN, B AUGUSTIN, JE AUGUSTINUS, A BAILLON, P BAMBADE, P BARAO, F BARATE, R BARBIELLINI, G BARDIN, DY BARKER, G BARONCELLI, A BARRING, O BARRIO, JA BARTL, W BATES, MJ BATTAGLIA, M BAUBILLIER, M BECKS, KH BEESTON, CJ BEGALLI, M BEILLIERE, P BELOKOPYTOV, Y BELTRAN, P BENEDIC, D BENVENUTI, AC BERGGREN, M BERTRAND, D BIANCHI, F BILENKY, MS BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORGEAUD, P BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CIUCHINI, M CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COSMO, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DASILVA, W DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DELGIUDICE, P DEMARIA, N DEANGELIS, A DEBEER, M DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DIAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GALEAZZI, G GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOYATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAJDUK, Z HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, C HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALKKINEN, J KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORCYL, K KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KUCEWICZ, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MYATT, G NARAGHI, F NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETROVYKH, L PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHULZE, B SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKAALI, TB SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TAVERNIER, S TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, IG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WALDNER, F WICKENS, JH WIKNE, J WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMALD, D WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI CLASSIFICATION OF THE HADRONIC DECAYS OF THE Z0 INTO B-QUARK AND C-QUARK PAIRS USING A NEURAL NETWORK SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; HEAVY FLAVOR PRODUCTION; JET FRAGMENTATION; PHYSICS; BOSON AB A classifier based on a feed-forward neural network has been used for separating a sample of about 123 500 selected hadronic decays of the Z0, collected by DELPHI during 1991, into three classes according to the flavour of the original quark pair: uuBAR + ddBAR + ssBAR (unresolved), ccBAR and bbBAR. The classification has been used to compute the partial widths of the ZO into b and c quark pairs. This gave GAMMA(ccBAR)/GAMMA(h) = 0.151 +/- 0.008 (stat.) +/- 0.041 (syst.), GAMMA(bbBAR)/GAMMA(h) = 0.232 +/- 0.005 (stat.) +/- 0.017 (syst.). C1 UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. INFN,I-16146 GENOA,ITALY. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV WARSAW,PL-00681 WARSAW,POLAND. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. NATL INST NUCL PHYS & HIGH ENERGY PHYS,1009 DB AMSTERDAM,NETHERLANDS. DUBNA JOINT NUCL RES INST,MOSCOW 101000,USSR. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. UNIV VALENCIA,DFAMN,E-46100 BURJASSOT,SPAIN. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV MILANO,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. UNIV LYON,F-69622 VILLEURBANNE,FRANCE. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. INFN,I-34127 TRIESTE,ITALY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. IST NAZL FIS NUCL,IST SUPER SANITA,I-00161 ROME,ITALY. UNIV COMPLUTENSE MADRID,E-28040 MADRID,SPAIN. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS 05,FRANCE. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. ULP,CTR RECHERCHE NUCL,IN2P3,CNRS,F-67037 STRASBOURG,FRANCE. INFN,I-40126 BOLOGNA,ITALY. VUB,ULB,IIHE,B-1050 BRUSSELS,BELGIUM. INFN,I-00173 ROME,ITALY. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. CTR ETUD SACLAY,DAPNIA,DSM,F-91191 GIF SUR YVETTE,FRANCE. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. INST JOZEF STEFAN,LJUBLJANA,YUGOSLAVIA. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-35131 PADUA,ITALY. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV AIX MARSEILLE 2,F-13288 MARSEILLE 09,FRANCE. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. PROTVINO HIGH ENERGY PHYS INST,PROTVINO 142284,USSR. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. VALENCIA CSIC,IFIC,E-46100 BURJASSOT,SPAIN. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND. INFN,I-20133 MILAN,ITALY. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV PARIS 07,F-75221 PARIS 05,FRANCE. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV PARIS 06,LPNHE,F-75230 PARIS 05,FRANCE. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. CTR BRASILEIRO PESQUISAS,BR-22290 RIO JANEIRO,BRAZIL. RP ABREU, P (reprint author), FOUL,IST,LIP,AV ELIAS GARCIA 14 10,P-1000 LISBON,PORTUGAL. RI Abreu, Pedro/L-2220-2014; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Del Giudice, Paolo/N-4655-2015; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Hallgren, Allan/A-8963-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014; de Groot, Nicolo/A-2675-2009; Katsanevas, Stavros/A-4297-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Andreazza, Attilio/E-5642-2011; Ruiz, Alberto/E-4473-2011; Dracos, Marcos/K-2335-2012; Botner, Olga/A-9110-2013; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Schulze, Bruno/B-7599-2008; Petrolini, Alessandro/H-3782-2011 OI Abreu, Pedro/0000-0002-9973-7314; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Del Giudice, Paolo/0000-0002-5633-8241; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626; Andreazza, Attilio/0000-0001-5161-5759; Ruiz, Alberto/0000-0002-3639-0368; Dracos, Marcos/0000-0003-0514-193X; Shellard, Ronald/0000-0002-2983-1815; Schulze, Bruno/0000-0002-3325-5785; Petrolini, Alessandro/0000-0003-0222-7594 NR 24 TC 35 Z9 35 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD DEC 3 PY 1992 VL 295 IS 3-4 BP 383 EP 395 DI 10.1016/0370-2693(92)91580-3 PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB801 UT WOS:A1992KB80100029 ER PT J AU BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L PACHECO, A PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BURNETT, TH DREVERMANN, H FORTY, RW HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MATTISON, T MEINHARD, H MENARY, S MEYER, T MINTEN, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTH, A ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PIETRZYK, B PRORIOL, J PRULHIERE, F STIMPFL, G FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ALTOON, B BOYLE, O COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM NASH, J PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P QIAN, Z ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BAUER, C BLUM, W BROWN, D COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LEMAIRE, MC LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F REEVES, P THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S GRUPEN, C MIRABITO, L RIVERA, F SCHAFER, U GANIS, G GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH WALSH, AM WEBER, FV WHITNEY, MH WU, SL WU, X ZOBERNIG, G AF BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L PACHECO, A PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W ATWOOD, WB BAUERDICK, LAT BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J BURNETT, TH DREVERMANN, H FORTY, RW HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MATTISON, T MEINHARD, H MENARY, S MEYER, T MINTEN, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTH, A ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PIETRZYK, B PRORIOL, J PRULHIERE, F STIMPFL, G FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ALTOON, B BOYLE, O COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEIGES, R GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM NASH, J PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BERNARD, V BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P QIAN, Z ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BAUER, C BLUM, W BROWN, D COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BERTIN, V BOUCROT, J CALLOT, O CHEN, X CORDIER, A DAVIER, M GRIVAZ, JF HEUSSE, P JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ZOMER, F ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LEMAIRE, MC LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J MOHAND, DS VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F REEVES, P THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S GRUPEN, C MIRABITO, L RIVERA, F SCHAFER, U GANIS, G GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH WALSH, AM WEBER, FV WHITNEY, MH WU, SL WU, X ZOBERNIG, G TI MEASUREMENTS OF MEAN LIFETIME AND BRANCHING FRACTIONS OF B HADRONS DECAYING TO J/PSI SO PHYSICS LETTERS B LA English DT Article ID ANNIHILATION; BOSON; LEP AB From a data sample of 450 000 hadronic events recorded with the ALEPH detector at LEP, 92 +/- 10 events are observed containing a J/psi meson decaying to mu+mu- or e+e-. From these data the measured inclusive branching fraction for a b flavoured hadron to decay to a J/psi is BR(b --> J/psiX) = (1.21 +/- 0.13 (stat.) +/- 0.08 (syst.))%, and the average b hadron lifetime in the events tagged with a J/psi is tau(b) = 1.35(-0.17)+0.19 +/- 0.05 ps. Five events are observed consistent with the exclusive decay B+/- --> J/psiK+/- and from these events the exclusive branching fraction is measured to be BR(B+/- --> J/psiK+/-) = (0.22 +/- 0.10 +/- 0.02)%. Upper limits for other exclusive branching ratios are given. C1 UNIV AUTONOMA BARCELONA,INST FIS ALTES ENERGIES,E-08193 BARCELONA,SPAIN. UNIV BARI,DIPARTIMENTO FIS,I-70126 BARI,ITALY. INFN,SEZ BARI,I-70126 BARI,ITALY. CHINESE ACAD SCI,INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. CERN,EUROPEAN LAB PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. UNIV CLERMONT FERRAND,IN2P3,PHYS CORPUSCULAIRE LAB,CNRS,F-63177 CLERMONT FERRAND,FRANCE. NIELS BOHR INST,DK-2100 COPENHAGEN,DENMARK. DEMOCRITOS NUCL RES CTR,GR-15310 ATHENS,GREECE. ECOLE POLYTECH,IN2P3,PHYS NUCL & HAUTES ENERGIES LAB,F-91128 PALAISEAU,FRANCE. UNIV EDINBURGH,DEPT PHYS,EDINBURGH EH9 3JZ,MIDLOTHIAN,SCOTLAND. UNIV FLORENCE,INFN,SEZ FIRENZE,DIPARTIMENTO FIS,I-50125 FLORENCE,ITALY. FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,DEPT PHYS,TALLAHASSEE,FL 32306. INFN,LNF,NAZL LAB,I-00044 FRASCATI,ITALY. UNIV GLASGOW,DEPT PHYS & ASTRON,GLASGOW G12 8QQ,SCOTLAND. UNIV HEIDELBERG,INST HOCHENERGIEPHYS,W-6900 HEIDELBERG,GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,DEPT PHYS,LONDON SW7 2BZ,ENGLAND. UNIV INNSBRUCK,INST MRC,A-6020 INNSBRUCK,AUSTRIA. UNIV LANCASTER,DEPT PHYS,LANCASTER LA1 4YB,ENGLAND. UNIV MAINZ,INST PHYS,W-6500 MAINZ,GERMANY. FAC SCI LUMINY,CTR PHYS PARTICULES,IN2P3,CNRS,F-13288 MARSEILLE,FRANCE. MAX PLANCK INST PHYS & ASTROPHYS,WERNER HEISENBERG INST PHYS,W-8000 MUNICH 40,GERMANY. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. RUTHERFORD APPLETON LAB,DEPT PARTICLE PHYS,DIDCOT OX11 0QX,OXON,ENGLAND. CE SACLAY,DAPNIA,SERV PHYS PARTICULES,F-91191 GIF SUR YVETTE,FRANCE. UNIV CALIF SANTA CRUZ,INST PARTICLE PHYS,SANTA CRUZ,CA 95064. UNIV SHEFFIELD,DEPT PHYS,SHEFFIELD S3 7RH,S YORKSHIRE,ENGLAND. UNIV PISA,INFN,SEZ PISA,DIPARTIMENTO FIS,I-56100 PISA,ITALY. UNIV SIEGEN,FACHBEREICH PHYS,W-5900 SIEGEN,GERMANY. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,SEZ TRIESTE,I-34127 TRIESTE,ITALY. UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. SLAC,STANFORD,CA 94309. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV NATAL,DIPARTIMENTO SCI FIS,DURBAN,SOUTH AFRICA. CNR,IST COSMO GEOFIS,TURIN,ITALY. CERN,DIV PPE,CH-1211 GENEVA 23,SWITZERLAND. LBL,BERKELEY,CA 94720. UNIV TURIN,IST FIS GEN,I-10124 TURIN,ITALY. RP BUSKULIC, D (reprint author), IN2P3,PHYS PARTICULES LAB,CNRS,F-74019 ANNECY LE VIEUX,FRANCE. RI Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012; Focardi, Ettore/E-7376-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Delfino, Manuel/A-1545-2012; ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; OI Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Delfino, Manuel/0000-0002-9468-4751; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Miquel, Ramon/0000-0002-6610-4836 NR 25 TC 35 Z9 35 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD DEC 3 PY 1992 VL 295 IS 3-4 BP 396 EP 408 DI 10.1016/0370-2693(92)91581-S PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB801 UT WOS:A1992KB80100030 ER PT J AU MEDFORTH, CJ SENGE, MO SMITH, KM SPARKS, LD SHELNUTT, JA AF MEDFORTH, CJ SENGE, MO SMITH, KM SPARKS, LD SHELNUTT, JA TI NONPLANAR DISTORTION MODES FOR HIGHLY SUBSTITUTED PORPHYRINS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID BACTERIUM RHODOPSEUDOMONAS-VIRIDIS; PHOTOSYNTHETIC REACTION CENTER; LIGHT-ABSORPTION PROPERTIES; RESONANCE RAMAN-SPECTRA; NICKEL OCTAETHYLPORPHYRIN; FORCE-FIELD; DODECAPHENYLPORPHYRIN; CHROMOPHORES; FLEXIBILITY; RADICALS AB The syntheses, structures, and spectroscopic properties of some novel dodecaphenyl- and dodecaalkylporphyrins have been investigated with the aim of designing model compounds to aid in evaluating theoretical models of porphyrin nonplanarity. It was found that dodecaphenylporphyrin (3) and the dodecaalkylporphyrins 4a-c could be prepared using standard synthetic procedures and that these porphyrins adopted very distorted nonplanar structures in the crystalline state. In the crystal structure of 3 the pyrrole rings were tilted with respect to the mean plane of the porphyrin to give a saddle conformation, whereas in the crystal structure of the nickel(II) complex of 4c (Ni4c) the pyrrole rings were twisted with respect to the mean plane to give a ruffled conformation. Nonplanar conformations with the same distortion modes were obtained as minimum energy structures for Ni3 and Ni4c using a molecular mechanics force field, which showed that the observed nonplanar conformations were due to steric repulsions between the peripheral substituents. Low-temperature NMR spectra indicated that the solution conformations of 3 and Ni4c were consistent with those found in the crystal structures. Several conformations of Ni4b and Ni4c with different quasi-axial and quasi-equatorial orientations of the alkyl chains were observed in solution, and saddle and ruffled distortion modes were clearly differentiated for the dications and nickel(II) complexes of porphyrins 4b and 4c. Finally, an attempt was made to synthesize the dodecaalkylporphyrin 5 using the same conditions applied to porphyrins 4a-c. This gave only the 5,15-dihydroporphyrin 6, presumably because the more spatially demanding six-membered ring prevented the oxidation of 6 to porphyrin 5 using 2,3-dichloro-5,6-dicyano-1,4-benzoquinone. C1 UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. RI Shelnutt, John/A-9987-2009; Senge, Mathias/F-1504-2011; Medforth, Craig/D-8210-2013; REQUIMTE, FMN/M-5611-2013; REQUIMTE, UCIBIO/N-9846-2013; Smith, Kevin/G-1453-2011 OI Shelnutt, John/0000-0001-7368-582X; Senge, Mathias/0000-0002-7467-1654; Medforth, Craig/0000-0003-3046-4909; Smith, Kevin/0000-0002-6736-4779 NR 50 TC 310 Z9 318 U1 4 U2 31 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 DEC 2 PY 1992 VL 114 IS 25 BP 9859 EP 9869 DI 10.1021/ja00051a019 PG 11 WC Chemistry, Multidisciplinary SC Chemistry GA KA798 UT WOS:A1992KA79800019 ER PT J AU ARNEY, DSJ BURNS, CJ SMITH, DC AF ARNEY, DSJ BURNS, CJ SMITH, DC TI SYNTHESIS AND STRUCTURE OF THE 1ST URANIUM(VI) ORGANOMETALLIC COMPLEX SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Letter ID X-RAY STRUCTURE; C-H ACTIVATION; CHEMISTRY; LIGANDS; AZOBENZENE; INSERTION; REDUCTION; DYNAMICS C1 LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP INC1,LOS ALAMOS,NM 87545. NR 30 TC 99 Z9 99 U1 0 U2 8 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 DEC 2 PY 1992 VL 114 IS 25 BP 10068 EP 10069 DI 10.1021/ja00051a053 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA KA798 UT WOS:A1992KA79800053 ER PT J AU CARLSON, KD WILLIAMS, JM GEISER, U KINI, AM WANG, HH KLEMM, RA KUMAR, SK SCHLUETER, JA FERRARO, JR LYKKE, KR WURZ, P PARKER, DH SUTIN, JDB SCHIRBER, JE VENTURINI, EL STOUT, P AF CARLSON, KD WILLIAMS, JM GEISER, U KINI, AM WANG, HH KLEMM, RA KUMAR, SK SCHLUETER, JA FERRARO, JR LYKKE, KR WURZ, P PARKER, DH SUTIN, JDB SCHIRBER, JE VENTURINI, EL STOUT, P TI THE CENTRAL BOND C-13=C-13 ISOTOPE EFFECT FOR SUPERCONDUCTIVITY IN HIGH-TC-BETA-ASTERISK-(ET)2I3 AND ITS IMPLICATIONS REGARDING THE SUPERCONDUCTING PAIRING MECHANISM SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Letter ID BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE BEDT-TTF; SHEAR-INDUCED SUPERCONDUCTIVITY; AMBIENT-PRESSURE; X-RAY; ORGANIC CONDUCTORS; BETA-(BEDT-TTF)2I3; MODULATION; PHASES C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. BIO RAD,DIGILAB DIV,CAMBRIDGE,MA 02139. UNIV CALIF IRVINE,DEPT CHEM,IRVINE,CA 92717. RP CARLSON, KD (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Kini, Aravinda/F-4467-2012 NR 23 TC 11 Z9 11 U1 0 U2 0 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 DEC 2 PY 1992 VL 114 IS 25 BP 10069 EP 10071 DI 10.1021/ja00051a054 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA KA798 UT WOS:A1992KA79800054 ER PT J AU DONGARRA, JJ GEIST, GA ROMINE, CH AF DONGARRA, JJ GEIST, GA ROMINE, CH TI ALGORITHM-710 - FORTRAN SUBROUTINES FOR COMPUTING THE EIGENVALUES AND EIGENVECTORS OF A GENERAL MATRIX BY REDUCTION TO GENERAL TRIDIAGONAL FORM SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Article DE ALGORITHMS; CONDENSED FORM; EIGENVALUES; NONSYMMETRIC; NUMERICAL ALGORITHMS AB This paper describes programs to reduce a nonsymmetric matrix to tridiagonal form, to compute the eigenvalues of the tridiagonal matrix, to improve the accuracy of an eigenvalue, and to compute the corresponding eigenvector. The intended purpose of the software is to find a few eigenpairs of a dense nonsymmetric matrix faster and more accurately than previous methods. The performance and accuracy of the new routines are compared to two EISPACK paths: RG and HQR-INVIT. The results show that the new routines are more accurate and also faster if less than 20 percent of the eigenpairs are needed. C1 OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. RI Dongarra, Jack/E-3987-2014 NR 11 TC 8 Z9 9 U1 0 U2 0 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0098-3500 J9 ACM T MATH SOFTWARE JI ACM Trans. Math. Softw. PD DEC PY 1992 VL 18 IS 4 BP 392 EP 400 DI 10.1145/138351.138352 PG 9 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA LQ870 UT WOS:A1992LQ87000002 ER PT J AU HONG, SI GRAY, GT AF HONG, SI GRAY, GT TI MICROSTRUCTURE AND MICROCHEMISTRY OF AN AL-ZN-MG-CU ALLOY MATRIX-20 VOL-PERCENT SIC COMPOSITE SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID TRANSMISSION ELECTRON-MICROSCOPY; SILICON-CARBIDE; ALUMINUM; PARTICLES; WHISKERS; 6061-ALUMINUM; INTERFACE; GROWTH; FIBER; T6 AB The microstructure and microchemistry of an underaged and overaged Al-Zn-Mg-Cu alloy matrix composite reinforced with 20 vol. % SiC was examined using analytical electron microscopy. The presence of MgO particles at the Al/SiC interfaces and Mg2Si in the matrix of the composites suggests that Mg could be depleted in the matrix. The precipitates in the unreinforced control alloys were found to be consistently larger than those of the composites following the same heat treatment conditions, suggesting that the aging kinetics of the unreinforced control alloy are faster than those in the composite. Data on the aging acceleration in other Al-alloy matrix composites has been analyzed to study aging kinetics. Aging acceleration was found to be more pronounced with increasing average absolute values of the atomic size misfit parameters of the constituent elements of the major precipitates. This result suggests that the preferential segregation of solute atoms and easier nucleation of precipitates from segregated solutes is responsible for aging acceleration in other composites. On the other hand, the depletion of Mg atoms in the matrix and the lack of interaction between Zn atoms and dislocations seems to be responsible for the aging deceleration in the reinforced Al-Zn-Mg-Cu alloy composites. RP HONG, SI (reprint author), LOS ALAMOS NATL LAB, DIV MAT SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. NR 70 TC 37 Z9 47 U1 4 U2 10 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 DEC PY 1992 VL 40 IS 12 BP 3299 EP 3315 DI 10.1016/0956-7151(92)90043-E PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JZ715 UT WOS:A1992JZ71500011 ER PT J AU ROLLETT, AD SROLOVITZ, DJ ANDERSON, MP DOHERTY, RD AF ROLLETT, AD SROLOVITZ, DJ ANDERSON, MP DOHERTY, RD TI COMPUTER-SIMULATION OF RECRYSTALLIZATION .3. INFLUENCE OF A DISPERSION OF FINE PARTICLES SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID GRAIN-BOUNDARY ENERGIES; 2ND PHASE PARTICLES; GROWTH; NUCLEATION; KINETICS; SIZE AB Two-dimensional Monte Carlo simulations of recrystallization have been carried out in the presence of incoherent and immobile particles for a range of different particle fractions, a range of stored energies and a range of densities of potential nuclei (embryos). For stored energies greater than a critical value (H/J > 1) the recrystallization front can readily pass the particles leading to a random density of particles on the front and a negligible influence of particles on the recrystallization kinetics. At lower stored energies the particles pin the recrystallization front leading to incomplete recrystallization. However at very low particle fractions, when the new grain has grown much larger than the matrix grains, before meeting any particles, the new grains can complete the consumption of the deformed grains giving complete "recrystallization" by a process that appears to be similar to abnormal grain growth. Particles are, as reported previously, very effective at pinning grain boundaries, both of the deformed and recrystallized grains, when boundaries migrate under essentially the driving force of boundary energy alone. Such boundaries show a density of particles that rises rapidly from the random value found at the start of the simulation. As a consequence, particles very strongly inhibit normal grain growth after recrystallization. Such growth can only occur if the as-recrystallized grain size is less than the limiting grain size seen in the absence of recrystallization. Under these circumstances a small increment of grain growth occurs until the grain boundaries once again acquire a higher than random density of particles. C1 UNIV MICHIGAN, DEPT MAT SCI & ENGN, ANN ARBOR, MI 48109 USA. EXXON RES & ENGN CO, ANNANDALE, NJ 08801 USA. DREXEL UNIV, DEPT MAT SCI & ENGN, PHILADELPHIA, PA 19104 USA. RP ROLLETT, AD (reprint author), LOS ALAMOS NATL LAB, DIV MAT SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. RI Rollett, Anthony/A-4096-2012 OI Rollett, Anthony/0000-0003-4445-2191 NR 34 TC 51 Z9 53 U1 2 U2 12 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 DEC PY 1992 VL 40 IS 12 BP 3475 EP 3495 DI 10.1016/0956-7151(92)90062-J PG 21 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JZ715 UT WOS:A1992JZ71500030 ER PT J AU PLOHR, BJ SHARP, DH AF PLOHR, BJ SHARP, DH TI A CONSERVATIVE FORMULATION FOR PLASTICITY SO ADVANCES IN APPLIED MATHEMATICS LA English DT Article ID CONSTITUTIVE MODEL; FINITE STRAIN; DEFORMATION; EQUATIONS; SOLIDS C1 LOS ALAMOS NATL LAB, DIV THEORET, COMPLEX SYST GRP, LOS ALAMOS, NM 87545 USA. RP SUNY STONY BROOK, STONY BROOK, NY 11794 USA. NR 41 TC 31 Z9 31 U1 2 U2 5 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0196-8858 EI 1090-2074 J9 ADV APPL MATH JI Adv. Appl. Math. PD DEC PY 1992 VL 13 IS 4 BP 462 EP 493 DI 10.1016/0196-8858(92)90022-O PG 32 WC Mathematics, Applied SC Mathematics GA JZ702 UT WOS:A1992JZ70200006 ER PT J AU WANG, J KOTLER, DP RUSSELL, M BURASTERO, S MAZARIEGOS, M THORNTON, J DILMANIAN, FA PIERSON, RN AF WANG, J KOTLER, DP RUSSELL, M BURASTERO, S MAZARIEGOS, M THORNTON, J DILMANIAN, FA PIERSON, RN TI BODY-FAT MEASUREMENT IN PATIENTS WITH ACQUIRED-IMMUNODEFICIENCY-SYNDROME - WHICH METHOD SHOULD BE USED SO AMERICAN JOURNAL OF CLINICAL NUTRITION LA English DT Article DE BODY COMPOSITION; BODY FAT; FAT-FREE MASS; AIDS ID DUAL-PHOTON ABSORPTIOMETRY; MASS; DENSITY; INVIVO; WATER AB Malnutrition is common in patients with acquired immunodeficiency syndrome (AIDS), which distorts the chemical contents in the fat-free mass (FFM) and alters the assumptions underlying the traditional methods for calculating body-fat content so that such measurements may not be accurate. In vivo neutron-activation analysis (IVNA) measures FFM independently of the traditional assumptions, thereby providing more accurate measurements of body fat. We compared seven methods for measuring body fat in 18 male patients with AIDS: IVNA, total body water (TBW by (H2O)-H-3 dilution), total body potassium (TBK by K-40 counting), dual-photon absorptiometry (DPA), bioelectrical impedance analysis (BIA), and two well-calibrated anthropometric methods. Fat(TBW) and fat(DPA) were not significantly different from fat(IVNA). Fat(TBW) gave the highest correlation with fat(IVNA) and the smallest SEE of +/-1.8% (1.1 kg). The traditional and widely available TBW and the newer DPA method provide reliable estimates of fat(IVNA) in patients with AIDS. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. COLUMBIA UNIV,COLL KINDERSPITAL,ST LUKES ROOSEVELT HOSP CTR,DEPT MED,DIV GASTROINTESTINAL,NEW YORK,NY 10025. RP WANG, J (reprint author), COLUMBIA UNIV,COLL KINDERSPITAL,ST LUKES ROOSEVELT HOSP CTR,BODY COMPOSIT UNIT,NEW YORK,NY 10025, USA. FU NIAID NIH HHS [AI21414]; NIDDK NIH HHS [DK42618, DK37352] NR 21 TC 30 Z9 31 U1 0 U2 1 PU AMER SOC CLINICAL NUTRITION PI BETHESDA PA 9650 ROCKVILLE PIKE, SUBSCRIPTIONS, RM L-2310, BETHESDA, MD 20814-3998 SN 0002-9165 J9 AM J CLIN NUTR JI Am. J. Clin. Nutr. PD DEC PY 1992 VL 56 IS 6 BP 963 EP 967 PG 5 WC Nutrition & Dietetics SC Nutrition & Dietetics GA JZ774 UT WOS:A1992JZ77400001 PM 1442663 ER PT J AU MCCABE, ERB TOWBIN, JA VANDENENGH, G TRASK, BJ AF MCCABE, ERB TOWBIN, JA VANDENENGH, G TRASK, BJ TI XP21 CONTIGUOUS GENE SYNDROMES - DELETION QUANTITATION WITH BIVARIATE FLOW KARYOTYPING ALLOWS MAPPING OF PATIENT BREAKPOINTS SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID GLYCEROL KINASE-DEFICIENCY; DUCHENNE MUSCULAR-DYSTROPHY; CONGENITAL ADRENAL HYPOPLASIA; ISLAND EYE DISEASE; CHRONIC GRANULOMATOUS-DISEASE; HUMAN X-CHROMOSOME; DNA ANALYSIS; DXS67 B24; LOCUS; RESOLUTION AB Bivariate flow karyotyping was used to estimate the deletion sizes for a series of patients with Xp21 contiguous gene syndromes. The deletion estimates were used to develop an approximate scale for the genomic map in Xp21. The bivariate flow karyotype results were compared with clinical and molecular genetic information on the extent of the patients' deletions, and these various types of data were consistent. The resulting map spans >15 Mb, from the telomeric interval between DXS41 (99-6) and DXS68 (Ll-4) to a position centromeric to the ornithine transcarbamylase locus. The deletion sizing was considered to be accurate to +/- 1 Mb. The map provides information on the relative localization of genes and markers within this region. For example, the map suggests that the adrenal hypoplasia congenita and glycerol kinase genes are physically close to each other, are within 1-2 Mb of the telomeric end of the Duchenne muscular dystrophy (DMD) gene, and are nearer to the DMD locus than to the more distal marker DXS28 (C7). Information of this type is useful in developing genomic strategies for positional cloning in Xp21. These investigations demonstrate that the DNA from patients with Xp21 contiguous gene syndromes can be valuable reagents, not only for ordering loci and markers but also for providing an approximate scale to the map of the Xp21 region surrounding DMD. C1 BAYLOR COLL MED,DEPT PEDIAT,HOUSTON,TX 77030. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. RP MCCABE, ERB (reprint author), BAYLOR COLL MED,INST MOLEC GENET,ROOM S921,1 BAYLOR PLAZA,HOUSTON,TX 77030, USA. FU NHLBI NIH HHS [5 K08 HL02485]; NICHD NIH HHS [5 P30 HD24064, HD22563] NR 44 TC 14 Z9 14 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0002-9297 J9 AM J HUM GENET JI Am. J. Hum. Genet. PD DEC PY 1992 VL 51 IS 6 BP 1277 EP 1285 PG 9 WC Genetics & Heredity SC Genetics & Heredity GA KC995 UT WOS:A1992KC99500010 PM 1463011 ER PT J AU GABRYS, C HULL, JR MULCAHY, TM AF GABRYS, C HULL, JR MULCAHY, TM TI A HIGH-SPEED DEMONSTRATION MOTOR WITH SUPERCONDUCTING BEARINGS SO AMERICAN JOURNAL OF PHYSICS LA English DT Note C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. NR 4 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 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD DEC PY 1992 VL 60 IS 12 BP 1153 EP 1154 DI 10.1119/1.16968 PG 2 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA JZ242 UT WOS:A1992JZ24200019 ER PT J AU WANG, J LU, JM OLSEN, K AF WANG, J LU, JM OLSEN, K TI MEASUREMENT OF ULTRATRACE LEVELS OF CHROMIUM BY ADSORPTIVE CATALYTIC STRIPPING VOLTAMMETRY IN THE PRESENCE OF CUPFERRON SO ANALYST LA English DT Article DE CHROMIUM; STRIPPING VOLTAMMETRY; STRIPPING POTENTIOMETRY; CUPFERRON AB An ultrasensitive adsorptive-catalytic stripping (voltammetric and potentiometric) procedure for determining trace levels of chromium in the presence of cupferron is described. The method offers higher sensitivity than previous adsorptive stripping schemes for chromium. Optimum experimental conditions were found to be a 1 X 10(-3) mol l-1 piperazine-N,N'-bis(ethanesulfonic acid) (PIPES) solution (pH 7.0) containing 1 X 10(-4) mol l-1 cupferron and a preconcentration potential of -0.82 V. A preconcentration time of 1 min results in a detection limit of 1.0 ng l-1. The relative standard deviation at 100 ng l-1 is 2.4% (n = 20, for 20 s preconcentration). The stripping potentiometric scheme allows convenient measurements of chromium in the presence of dissolved oxygen. The identical stripping response for chromium(III) and chromium(VI) solutions makes the method applicable to the measurement of the total chromium content. The simultaneous determination of chromium and uranium is illustrated. The merits of the proposed procedure are demonstrated by the analysis of soil and groundwater samples. C1 PACIFIC NW LAB, DEPT GEOSCI, RICHLAND, WA 99352 USA. RP WANG, J (reprint author), NEW MEXICO STATE UNIV, DEPT CHEM, LAS CRUCES, NM 88003 USA. RI Wang, Joseph/C-6175-2011 NR 8 TC 71 Z9 73 U1 0 U2 5 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0003-2654 J9 ANALYST JI Analyst PD DEC PY 1992 VL 117 IS 12 BP 1913 EP 1917 DI 10.1039/an9921701913 PG 5 WC Chemistry, Analytical SC Chemistry GA KD941 UT WOS:A1992KD94100022 ER PT J AU NG, KC WHITTEN, WB ARNOLD, S RAMSEY, JM AF NG, KC WHITTEN, WB ARNOLD, S RAMSEY, JM TI DIGITAL CHEMICAL-ANALYSIS OF DILUTE MICRODROPLETS SO ANALYTICAL CHEMISTRY LA English DT Article ID LASER-INDUCED FLUORESCENCE; HYDRODYNAMICALLY FOCUSED FLOWS; SINGLE-MOLECULE DETECTION; PHYCOERYTHRIN AB The concept of digital molecular detection, the ability to count individual molecules, is described and the mathematical framework for defining detection limits under various experimental constraints presented. We shoe that with modest signal-to-noise ratio for detection of single molecules, significant advantages accrue when using a digital detection strategy versus a conventional approach. Concentration detection limits decrease inversely with total sample volume for digital detection versus reduction as the inverse square root for conventional measurements. This advantage could yield detection limits that are reduced by orders of magnitude if sample volume is limited. In addition, we present experimental results demonstrating the concept of digital molecular detection using beta-phycoerythrin molecules and levitated microdroplet fluorimetry. Single beta-phycoerythrin molecules are detected with a signal-to-noise ratio greater than 4. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. CALIF STATE UNIV FRESNO,FRESNO,CA 93740. POLYTECH INST NEW YORK,BROOKLYN,NY. NR 17 TC 34 Z9 34 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD DEC 1 PY 1992 VL 64 IS 23 BP 2914 EP 2919 DI 10.1021/ac00047a007 PG 6 WC Chemistry, Analytical SC Chemistry GA KA275 UT WOS:A1992KA27500008 ER PT J AU NOGAR, NS ESTLER, RC CONIA, J JACKSON, PJ AF NOGAR, NS ESTLER, RC CONIA, J JACKSON, PJ TI DETECTION OF COPPER IN ISOLATED PLANT-CELLS BY RESONANCE IONIZATION MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID DATURA-INNOXIA; SPECTROSCOPY; ION; CULTURES; CADMIUM AB Detection of copper in isolated plant cells at the millimolar level and below is demonstrated by resonance ionization mass spectrometry (RIMS). Datura Innoxia Mill. cell suspension cultures were maintained in the presence of 1 mM CuSO4 and converted into protoplasts by enzymatic digestion of the cell wall. Aliquots containing 10-100 protoplasts were subsequently examined by RIMS to detect the minute amounts of copper isotopes that were accumulated by the cells. results suggest opportunities to measure trace metal concentration at the single cell level. Single cell mass spectra should not only provide information about the physiological state of isolated growing cells but also reflect the intracellular content of small cell populations when exposed to chemicals or toxic compounds. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. FT LEWIS COLL,DEPT CHEM,DURANGO,CO 81301. CELL ROBOT,ALBUQUERQUE,NM 87107. RP NOGAR, NS (reprint author), LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,MS J565,LOS ALAMOS,NM 87545, USA. NR 32 TC 9 Z9 9 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 DEC 1 PY 1992 VL 64 IS 23 BP 2972 EP 2976 DI 10.1021/ac00047a016 PG 5 WC Chemistry, Analytical SC Chemistry GA KA275 UT WOS:A1992KA27500017 ER PT J AU MCDOWELL, WJ CASE, GN MCDONOUGH, JA BARTSCH, RA AF MCDOWELL, WJ CASE, GN MCDONOUGH, JA BARTSCH, RA TI SELECTIVE EXTRACTION OF CESIUM FROM ACIDIC NITRATE SOLUTIONS WITH DIDODECYLNAPHTHALENESULFONIC ACID SYNERGIZED WITH BIS(TERT-BUTYLBENSZO)-21-CROWN-7 SO ANALYTICAL CHEMISTRY LA English DT Article ID SOLVENT-EXTRACTION; EQUILIBRIUM AB The behavior of other crown other-synergized sulfonic acid extraction systems suggested that the title system would be selective for cesium. Synthesis of the now lipophilic crown ether, bis[4(5)-tort-butylbenzo]-21-crown-7 (D(tBB)21C7), allowed testing of this hypothesis. Under nonloading conditions, the distribution coefficient for cesium between a toluene solution 0.025 M in didodecyinaphthalenesulfonic acid (HDD-NS) and D(tBB)21C7 and an aqueous phase 0.1 M in nitric acid is 100 with separation factors of 1.2 from rubidium, 5.6 from potassium, and 294 from sodium. Under loading and competitive extraction conditions, the distribution coefficients were lower (5 for cesium), but the separation factors remained in the same order and of useful magnitude, 1.5 from rubidium, 6.4 from potassium, and 192 from sodium. Increasing the concentrations of D(tBB)21C7 and HDDNS in the organic phase gives higher distribution coefficients for cesium as did lower aqueous acid concentrations. C1 TEXAS TECH UNIV,DEPT CHEM & BIOCHEM,LUBBOCK,TX 79409. RP MCDOWELL, WJ (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 23 TC 87 Z9 88 U1 3 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD DEC 1 PY 1992 VL 64 IS 23 BP 3013 EP 3017 DI 10.1021/ac00047a024 PG 5 WC Chemistry, Analytical SC Chemistry GA KA275 UT WOS:A1992KA27500025 ER PT J AU MARSCH, GA JANKOWIAK, R FARHAT, JH SMALL, GJ AF MARSCH, GA JANKOWIAK, R FARHAT, JH SMALL, GJ TI SEPARATION AND IDENTIFICATION OF DNA CARCINOGEN ADDUCT CONFORMERS BY POLYACRYLAMIDE-GEL ELECTROPHORESIS WITH LASER-INDUCED FLUORESCENCE DETECTION SO ANALYTICAL CHEMISTRY LA English DT Article ID ANTI-BENZO(A)PYRENE DIOL EPOXIDE; CHEMICAL CARCINOGENS; DIHYDRODIOL EPOXIDE; OPTICAL ENANTIOMERS; BENZOPYRENE; BINDING; 7,8-DIOL-9,10-EPOXIDES; STEREOISOMERS; CONFORMATIONS; SPECTROSCOPY AB We have developed a separation protocol utilizing high-resolution polyacrylamide gel electrophoresis (PAGE) to isolate stable anti-benzo[a]pyrene diol epoxide adducts of oligodeoxynucleotides. Both enantiomers produced multiple adduct species. The distribution of adduct types could be quantitated by densitometry of autoradiograms or Cerenkov counting of eluted oligomers modified by anti-BPDE isomers. Laser-induced fluorescence (LIF) spectra of eluted adducts at 4.2 K (fluorescence line-narrowing spectroscopy) and 77 K revealed that bands corresponded to pure conformers of pyrene chromophore. Carcinogen-modified oligodeoxynucleotides were single-stranded, but there were often considerable stacking Interactions between the pyrenyl residues and the oligonucleotide bases, indicating that electrophoresed oligomers were single-stranded but in a native, versus random-coil, conformation. The ability to identify and quantitate adducts by PAGE-LIF, coupled with the high resolution and sensitivity of both techniques, makes PAGE and LIF in tandem a potentially powerful tool in the study of chemical carcinogenesis or other ligand-DNA interactions. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 48 TC 14 Z9 14 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 DEC 1 PY 1992 VL 64 IS 23 BP 3038 EP 3044 DI 10.1021/ac00047a028 PG 7 WC Chemistry, Analytical SC Chemistry GA KA275 UT WOS:A1992KA27500029 PM 1463222 ER PT J AU LEE, TT YEUNG, ES AF LEE, TT YEUNG, ES TI QUANTITATIVE-DETERMINATION OF NATIVE PROTEINS IN INDIVIDUAL HUMAN ERYTHROCYTES BY CAPILLARY ZONE ELECTROPHORESIS WITH LASER-INDUCED FLUORESCENCE DETECTION SO ANALYTICAL CHEMISTRY LA English DT Article ID TUBULAR LIQUID-CHROMATOGRAPHY; SNAIL NEURONS AB Intracellular fluid within single human erythrocytes is analyzed by capillary electrophoresis with laser-excited native protein fluorescence. Good signal-to-noise is achieved, allowing even minor components to be quantified. Non-Gaussian distributions were found for total protein, fraction carbonic anhydrase, fraction hemoglobin A0, and an unidentified component Variations among a group of 29 cells for each quantity are as much as 1 order of magnitude, even though erythrocytes are known to be fairly homogeneous in size distribution. Variations in fraction hemoglobin A0 reflect differences in vitro oxidation rates to methemoglobin. A positive correlation was observed between carbonic anhydrase and hemoglobin A0 for individual cells. This is consistent with the presence of erythrocytes of different ages within the population, with the older cells being less capable of maintaining enzyme activity and preventing oxidative damage. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 37 TC 161 Z9 166 U1 1 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD DEC 1 PY 1992 VL 64 IS 23 BP 3045 EP 3051 DI 10.1021/ac00047a029 PG 7 WC Chemistry, Analytical SC Chemistry GA KA275 UT WOS:A1992KA27500030 PM 1463223 ER PT J AU KRIGER, MS COOK, KD SHORT, RT TODD, PJ AF KRIGER, MS COOK, KD SHORT, RT TODD, PJ TI SECONDARY ION EMISSION FROM SOLUTIONS - TIME-DEPENDENCE AND SURFACE PHENOMENA SO ANALYTICAL CHEMISTRY LA English DT Article ID FAST ATOM BOMBARDMENT; MASS-SPECTROMETRY; GLYCEROL SOLUTIONS; MATRIX; CHEMISTRY; BEHAVIOR; SPECTRUM; BEAM AB The temporal behavior of FAB mass spectra from glycerol solutions of tetradecyltrimethylammonium bromide (C14H29N(CH3)3Br, TTAB) and tetraethylammonium iodide (TEAI) was investigated. FAB spectra of the TTAB solution displayed a continuous decrease in TTA+ with time. Spectra obtained from the TEAI solution were initially invariant for several minutes and then displayed a gradual increase in the relative abundance of TEA+ to a maximum, followed by a precipitous drop in ion intensity. Secondary ion images of droplets of TTAB solution showed that emission of both TTA+ and glycerol secondary ion images of droplets of TEAI solution showed heterogeneous and segregated emission of both TEA+ and protonated glycerol. Results from the FAB spectra and the secondary ion images were correlated and rationalized on the basis of surface tension induced mass transport and matrix evaporation. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. OI Cook, Kelsey/0000-0003-2053-3309 FU NIGMS NIH HHS [R01-GM41617] 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 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD DEC 1 PY 1992 VL 64 IS 23 BP 3052 EP 3058 DI 10.1021/ac00047a030 PG 7 WC Chemistry, Analytical SC Chemistry GA KA275 UT WOS:A1992KA27500031 PM 1463224 ER PT J AU BOESE, R GREEN, JR MITTENDORF, J MOHLER, DL VOLLHARDT, KPC AF BOESE, R GREEN, JR MITTENDORF, J MOHLER, DL VOLLHARDT, KPC TI THE 1ST HEXABUTADIYNYLBENZENES - SYNTHESIS AND STRUCTURES SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID CYCLOHEXATRIENE RING; HEXAETHYNYLBENZENE AB An important intermediate en route to antikekulene is the C30H6 hydrocarbon 1d. A precursor for this intermediate is 1a, which can be protodesilylated; but in contrast to 1a-1c, 1d cannot yet be obtained in pure state. An X-ray crystal structure of 1c confirms the high symmetry of the compound. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP BOESE, R (reprint author), UNIV GESAMTHSCH ESSEN,INST ANORGAN CHEM,UNIV STRA 5-7,POSTFACH 103764,W-4300 ESSEN 1,GERMANY. NR 26 TC 83 Z9 83 U1 1 U2 4 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD DEC PY 1992 VL 31 IS 12 BP 1643 EP 1645 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA KK712 UT WOS:A1992KK71200035 ER PT J AU BUNZ, U VOLLHARDT, KPC HO, JS AF BUNZ, U VOLLHARDT, KPC HO, JS TI TETRAALKYNYLMETHANES - SYNTHESIS OF DIETHYNYLDIPROPARGYLMETHANE AND TETRAPROPARGYLMETHANE SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID POLYMERS; CHEMISTRY; MICELLES AB In a few steps the novel monomers 1 and 2, can be synthesized. Despite four C-C triple bonds that lie close together, neither 1 nor 2 are air- and moisture-sensitive. The hydrocarbon 2 was characterized by X-ray crystal analysis. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Bunz, Uwe /L-9232-2013 NR 36 TC 20 Z9 20 U1 0 U2 0 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0570-0833 J9 ANGEW CHEM INT EDIT JI Angew. Chem.-Int. Edit. Engl. PD DEC PY 1992 VL 31 IS 12 BP 1648 EP 1651 DI 10.1002/anie.199216481 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA KK712 UT WOS:A1992KK71200038 ER PT J AU BOWMAN, KO SHENTON, LR AF BOWMAN, KO SHENTON, LR TI SOME EXACT EXPRESSIONS FOR THE MEAN AND HIGHER MOMENTS OF FUNCTIONS OF SAMPLE-MOMENTS SO ANNALS OF THE INSTITUTE OF STATISTICAL MATHEMATICS LA English DT Article DE COEFFICIENT OF VARIATION; FRULLANI INTEGRALS; MOMENT SERIES; SAMPLE VARIANCE; SYMBOLIC CHARACTERISTIC FUNCTION AB Examples of exact expressions for the moments (mainly of the mean) of functions of sample moments are given. These provide checks on alternative developments such as asymptotic series form n --> infinity, and simulation processes. Exact expressions are given for the mean of the square of the sample coefficient of variation, particularly in uniform sampling; Frullani integrals studied by G. H. Hardy arise. It should be kept in mind that exact results for (joint) moment generating functions (mgfs) are of interest as they produce a means of obtaining exact results for (cross) moments-including moments with negative indices. Thus an exact expression for the joint mgf of the 1st two noncentral moments can be used to obtain the mean of the (c.v.) 2 (but not for the mean of the c.v.). A general expression is given for the moment generating function of the sample variance. The limitations of Fisher's symbolic formula for the characteristic function of sample moments (or more general statistics) are noted. C1 OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,MATH SCI SECT,OAK RIDGE,TN 37831. UNIV GEORGIA,COMP SERV ANNEX,ATHENS,GA 30602. NR 12 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 0020-3157 J9 ANN I STAT MATH JI Ann. Inst. Stat. Math. PD DEC PY 1992 VL 44 IS 4 BP 781 EP 798 DI 10.1007/BF00053406 PG 18 WC Statistics & Probability SC Mathematics GA KH464 UT WOS:A1992KH46400015 ER PT J AU TESAR, AA FUCHS, BA HED, PP AF TESAR, AA FUCHS, BA HED, PP TI EXAMINATION OF THE POLISHED SURFACE CHARACTER OF FUSED-SILICA SO APPLIED OPTICS LA English DT Article AB Investigation of the surface character of fused silica polished with various compounds dispersed in water identified pH 4 as the optimum condition for high quality. Analyses support the conclusion that at this pH redeposition of hydrated material onto the surface during polishing is limited. Comparative polishing results for Zerodur are included. Improvement of the laser-damage threshold of a coating on the pH 4 polished fused silica is suggested. RP TESAR, AA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 12 TC 18 Z9 19 U1 1 U2 6 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 7164 EP 7172 PG 9 WC Optics SC Optics GA JZ714 UT WOS:A1992JZ71400001 PM 20802577 ER PT J AU FERRIERI, RA ALEXOFF, DL SCHLYER, DJ WOLF, AP AF FERRIERI, RA ALEXOFF, DL SCHLYER, DJ WOLF, AP TI A UNIVERSAL WATER TARGET LOADING SYSTEM WITH DIRECT IN-TARGET LIQUID-LEVEL SENSING SO APPLIED RADIATION AND ISOTOPES LA English DT Article ID PROTON IRRADIATION; F-18 FLUORIDE; FLUORIDE PRODUCTION; N-13 AMMONIA AB A reliable remote water target loading system has been designed and fabricated around the operation of a single pneumatic syringe dispenser that accesses one of two water reservoirs, filling one or more targets depending on the system configuration. For multiple radionuclide configuration, reservoirs are filled with O-18-enriched water for [F-18]fluoride production, and natural abundance water for [N-13]nitrate and [N-13]nitrite production. When actuated, the system withdraws a calibrated volume of water from a selected reservoir, and automatically dispenses that charge through a short transfer line to the appropriate target. A second actuation then forces the dispenser to purge itself of residual water by dispensing a charge of helium gas through the same line thus completing the transfer of water to the target volume. Direct liquid level sensing inside the target, utilizing the specific resistance response of water, signals the operator that the target is loaded. For single radionuclide configuration, one or both reservoirs can be used with the same type of water, while dispensing is directed to a single target. RP FERRIERI, RA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 20 TC 1 Z9 1 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8043 J9 APPL RADIAT ISOTOPES JI Appl. Radiat. Isot. PD DEC PY 1992 VL 43 IS 12 BP 1485 EP 1491 PG 7 WC Chemistry, Inorganic & Nuclear; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Chemistry; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA KC861 UT WOS:A1992KC86100009 ER PT J AU WOLKIN, A SANFILIPO, M WOLF, AP ANGRIST, B BRODIE, JD ROTROSEN, J AF WOLKIN, A SANFILIPO, M WOLF, AP ANGRIST, B BRODIE, JD ROTROSEN, J TI NEGATIVE SYMPTOMS AND HYPOFRONTALITY IN CHRONIC-SCHIZOPHRENIA SO ARCHIVES OF GENERAL PSYCHIATRY LA English DT Article ID POSITRON EMISSION TOMOGRAPHY; GLUCOSE METABOLIC-RATE; DORSOLATERAL PREFRONTAL CORTEX; PHYSIOLOGIC DYSFUNCTION; AFFECTIVE-DISORDERS; FRONTAL LOBES; BASAL GANGLIA; PET; FLUORODEOXYGLUCOSE; DEOXYGLUCOSE AB Frontal lobe dysfunction is widely suspected to underlie negative symptoms of schizophrenia. This hypothesis is based largely on long-standing observations of the similarities between the effects of frontal lobe lesions and negative symptoms. However, there is little direct evidence specifically for such an association in schizophrenic patients. We measured the relationship between decreased relative pre-frontal cortex glucose metabolism (hypofrontality) using positron emission tomography and evaluated the severity of negative symptoms in 20 chronic schizophrenics who underwent scanning while not receiving neuroleptic drugs. We found a close relationship between negative symptoms and prefrontal hypometabolism, particularly in the right dorsolateral convexity. This association was regionally specific. Furthermore, there was no evidence that this relationship was an artifact of age, cerebral atrophy, or severity of positive symptoms. C1 NYU MED CTR,DEPT PSYCHIAT,NEW YORK,NY 10016. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP WOLKIN, A (reprint author), VET ADM MED CTR,PSYCHIAT SERV,423 E 23RD ST,NEW YORK,NY 10010, USA. FU NINDS NIH HHS [NS-15638] NR 55 TC 290 Z9 292 U1 2 U2 8 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-990X J9 ARCH GEN PSYCHIAT JI Arch. Gen. Psychiatry PD DEC PY 1992 VL 49 IS 12 BP 959 EP 965 PG 7 WC Psychiatry SC Psychiatry GA KB867 UT WOS:A1992KB86700005 PM 1360200 ER PT J AU WILLIAMS, PT VRANIZAN, KM AUSTIN, MA KRAUSS, RM AF WILLIAMS, PT VRANIZAN, KM AUSTIN, MA KRAUSS, RM TI FAMILIAL CORRELATIONS OF HDL SUBCLASSES BASED ON GRADIENT GEL-ELECTROPHORESIS SO ARTERIOSCLEROSIS AND THROMBOSIS LA English DT Article DE GRADIENT GEL ELECTROPHORESIS; HIGH DENSITY LIPOPROTEINS; GENETICS; FAMILY STUDIES; APOLIPOPROTEIN A-I ID HIGH-DENSITY-LIPOPROTEIN; APOLIPOPROTEIN A-I; COMPLEX SEGREGATION ANALYSIS; BIOLOGICAL DETERMINANTS; GENETIC HERITABILITY; UTAH PEDIGREES; RISK-FACTORS; MAJOR GENE; BODY-MASS; CHOLESTEROL AB We used nondenaturing polyacrylamide gradient gel electrophoresis to examine the familial correlations of high density lipoprotein (HDL) subclasses for 150 offspring in 47 nuclear families, 'rhe absorbance of protein stain was used as an index of mass concentrations at intervals of 0.01 nm within five HDL subclasses: HDL3c (7.2-7.8 nm), HDL3b (7.8-8.2 nm), HDL3a (8.2-8.8 nm), HDL2a (8.8-9.7 nm), and HDL2b (9.7-12 nm). Parent-offspring correlations were computed for two different characterizations of the parents: 1) by sex (i.e., mother versus father) and 2) by their relative values (highest versus lowest HDL). Sibling resemblance was assessed by using the intraclass correlations coefficient. Family members were significantly related for the following subclasses: HDL3c (sibling and father-offspring), HDL3b (sibling), HDL3a (sibling and mother-offspring), HDL2a (mother-offspring), and HDL2b (sibling, father-offspring, and mother-offspring). The offsprings' HDL3c and HDL2a, values were more strongly related to their fathers' than to their mothers' values, whereas their HDI2b levels were more strongly related to their mothers' than their fathers' values. In addition, fathers' HDL2b levels were inversely correlated with the offsprings' HDL3b. The parents' HDL subclass levels were more strongly related to subclass levels of their younger (less-than-or-equal-to 20 years) than their older offspring. Among all subclasses, HDL2b showed the strongest parent-offspring relation, with the parents' HDL values accounting for over 30% of the variance in offsprings' HDL2b. Correlating the offspring with the highest- and lowest-valued parent revealed possible differences in the inheritance of apolipoprotein (apo) A-I with apo A-II-containing HDL subclasses (HDL3b and HDL2a) and apo A-I without A-II-containing subclasses (HDL3c, HDL3a, and HDL2b). Specifically, the offsprings' HDL3b and HDL2a values were correlated with the low-valued parent only, whereas the offsprings' HDL2b, and HDL3c levels correlated equally with the high-valued and low-valued parent. The familial correlations for HDL subclasses remained significant when adjusted for the parents' HDL cholesterol and apo A-I values. We conclude that gradient gel electrophoresis reveals correlations among family members for specific HDL subclasses. which are independent of HDL cholesterol and apo A-I. C1 UNIV WASHINGTON,SCH PUBL HLTH & COMMUNITY MED,DEPT EPIDEMIOL,SEATTLE,WA 98195. RP WILLIAMS, PT (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,BLDG 934,BERKELEY,CA 94720, USA. FU NHLBI NIH HHS [HL-02183, HL-24462, HL-18574] NR 55 TC 15 Z9 15 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 1049-8834 J9 ARTERIOSCLER THROMB JI Arterioscler. Thromb. PD DEC PY 1992 VL 12 IS 12 BP 1467 EP 1476 PG 10 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA KB239 UT WOS:A1992KB23900012 PM 1450178 ER PT J AU FEINGOLD, KR GRUNFELD, C PANG, MY DOERRLER, W KRAUSS, RM AF FEINGOLD, KR GRUNFELD, C PANG, MY DOERRLER, W KRAUSS, RM TI LDL SUBCLASS PHENOTYPES AND TRIGLYCERIDE-METABOLISM IN NON-INSULIN-DEPENDENT DIABETES SO ARTERIOSCLEROSIS AND THROMBOSIS LA English DT Article DE NON-INSULIN-DEPENDENT DIABETES-MELLITUS; LOW DENSITY LIPOPROTEIN SUBCLASSES; TRIGLYCERIDE METABOLISM ID LOW-DENSITY-LIPOPROTEIN; ACQUIRED-IMMUNODEFICIENCY-SYNDROME; PLASMA TRIGLYCERIDE; HYPERTRIGLYCERIDEMIA; CHOLESTEROL; MELLITUS; DISEASE; LIPASE; LIPIDS; RISK AB Plasma low density lipoprotein (LDL) comprises multiple discrete subclasses differing in size, density, and chemical composition. A common, heritable phenotype characterized by the predominance of small, dense LDL particles (LDL subclass phenotype B) is associated with relatively increased concentrations of plasma triglycerides, reduced levels of high density lipoprotein, and increased risk of coronary artery disease in comparison with subjects with larger LDL (LDL subclass phenotype A). Population studies have indicated that approximately 20-30% of adult men have phenotype B, and another 15-20% have LDL of intermediate size. The lipid changes in phenotype B are similar to those that have been observed in patients with non-insulin-dependent diabetes mellitus (NIDDM). In the present study, we have assessed LDL subclass phenotypes in normolipidemic men with NIDDM and in age-matched control subjects who had similar lipid levels. There was a greater than twofold increase in the percentage of individuals with the LDL B phenotype in the NIDDM subjects. The LDL B phenotype was associated with higher plasma triglyceride levels and a trend toward lower high density lipoprotein cholesterol levels compared with the LDL A phenotype in the NIDDM subjects, as has been previously observed in control groups. Indices of diabetic control, such as fasting and hemoglobin A1 levels, were similar regardless of LDL phenotype pattern, suggesting that glycemic control was not likely to account for the increase in the LDL B phenotype. In both control and NIDDM subjects, the clearance of triglyceride-rich lipoproteins was slowed in the subjects with the LDL phenotype B compared with those with the A phenotype. Multiple regression analysis demonstrated that the diagnosis of NIDDM is an independent predictor of the LDL B phenotype. In summary, the present study demonstrates that NIDDM is associated with an increased prevalence of the LDL subclass phenotype B, even in the absence of frank hyperlipidemia. Thus, genetic and metabolic factors leading to the predominance of small, dense LDL may contribute to the increased risk of vascular disease in patients with NIDDM. C1 LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,MOLEC MED RES PROGRAM,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DEPT MED,SAN FRANCISCO,CA 94143. UNIV CALIF BERKELEY,DONNER LAB,BERKELEY,CA 94720. RP FEINGOLD, KR (reprint author), DEPT VET AFFAIRS MED CTR,METAB SECT 111F,MED SERV,4150 CLEMENT ST,SAN FRANCISCO,CA 94121, USA. FU NHLBI NIH HHS [HL-18754]; NIDDK NIH HHS [DK-40990] NR 45 TC 279 Z9 281 U1 0 U2 2 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 1049-8834 J9 ARTERIOSCLER THROMB JI Arterioscler. Thromb. PD DEC PY 1992 VL 12 IS 12 BP 1496 EP 1502 PG 7 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA KB239 UT WOS:A1992KB23900015 PM 1450181 ER PT J AU LEONARD, PJT RICHER, HB FAHLMAN, GG AF LEONARD, PJT RICHER, HB FAHLMAN, GG TI THE MASS AND STELLAR CONTENT OF THE GLOBULAR-CLUSTER M13 SO ASTRONOMICAL JOURNAL LA English DT Article ID PHOTOMETRY; RATIOS AB Kinematical information has been used to solve the Jeans equation to provide mass estimates in the globular cluster M13. Since the cluster has been the subject of both proper motion and radial velocity studies, it is possible to compare mass estimates based on velocity dispersion profiles derived from the two types of data. It is found that the proper motions provide a much more constrained mass estimate than do the radial velocities, which is due to the fundamental fact that two independent velocity dispersion profiles are required to solve the spherical Jeans equation. The adopted distance of 7240 pc, obtained from photometric studies, results in only marginal agreement between the cluster dynamics as derived from the proper motions and the radial velocities. Reducing the distance by 10% improves the agreement substantially. The best estimate of the mass inside a spherical shell centered on the cluster with a radius corresponding to 390 arcsec on the sky is congruent-to 6 X 10(5) M .. A comparison of the dynamical mass estimate with a Michie-King model of M13 suggests that much of the cluster mass (perhaps 50%) may be in the form of low-mass stars and brown dwarfs. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP LEONARD, PJT (reprint author), UNIV BRITISH COLUMBIA,DEPT GEOPHYS & ASTRON,VANCOUVER V6T 1Z4,BC,CANADA. NR 26 TC 17 Z9 17 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 2104 EP 2111 DI 10.1086/116386 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JZ639 UT WOS:A1992JZ63900006 ER PT J AU GLENDENNING, NK WEBER, F AF GLENDENNING, NK WEBER, F TI NUCLEAR SOLID CRUST ON ROTATING STRANGE QUARK STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DENSE MATTER; ELEMENTARY PARTICLES; STARS, INTERIORS ID GENERAL RELATIVITY; EARLY UNIVERSE; NEUTRON-STARS; GROUND-STATE; FLUID BODIES; MATTER; PULSAR; STABILITY; EQUATIONS; PHASES AB We calculate in general relativity the thickness, mass, and moment of inertia of the nuclear solid crust that can exist on the surface of a rotating strange quark star suspended out of contact with the quark core by an electric dipole layer on the core surface and the centrifugal force. Aside from the interesting properties of such stars, a particular question of great import to the viability of the strange matter hypothesis is whether strange stars can undergo the observed phenomena of pulsar glitches. We find that the nuclear crust can have a moment of inertia sufficiently large that a fractional change can account for the magnitude of pulsar glitches, even giant glitches. However, before testing a detailed model of the coupling of the crust and quark core, not an easy problem, we are not able to draw the definite conclusion that strange stars can account for all phenomena associated with glitching such as the healing time and recurrence rate. The problem of understanding quakes on compact stars is, afterall, akin to predicting earthquakes. We study the particular sequence of stars, both rotating and stationary, that have the maximum possible crust density, the neutron drip density. The sequence has a minimum mass of about 0.015 M. or about 15 Jupiter masses. Stars near this limit have crusts of thickness tens to hundreds of kilometers and are small and dark and so could be hiding places of baryonic matter. RP GLENDENNING, NK (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,MAILSTOP 70A-3307,BERKELEY,CA 94720, USA. NR 37 TC 121 Z9 121 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 DEC 1 PY 1992 VL 400 IS 2 BP 647 EP 658 DI 10.1086/172026 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JY438 UT WOS:A1992JY43800023 ER PT J AU LI, H LIANG, EP AF LI, H LIANG, EP TI X-RAY FLASHES FROM M31 BASED ON EXTENDED HALO MODELS OF GAMMA-RAY BURSTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (M31); GALAXY, HALO; GAMMA RAYS, BURSTS; STARS, NEUTRON; X-RAYS, BURSTS AB We consider X-ray flashes (XRFs) associated with gamma-ray bursts (GRBs) from M31, using an extended halo model. We find that for XRFs detectable with the ROSAT Position Sensitive Proportional Counter (PSPC), the expected rate is less-than-or-equal-to 1 day-1 for a variety of halo models. Hence we need M31 surveys much longer than a week to seriously confront the extended halo hypothesis. C1 LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550. RP LI, H (reprint author), RICE UNIV,DEPT SPACE PHYS & ASTRON,HOUSTON,TX 77251, USA. NR 12 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 1 PY 1992 VL 400 IS 2 BP L59 EP L62 DI 10.1086/186649 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JY439 UT WOS:A1992JY43900005 ER PT J AU ENGELMANN, RJ PENDERGRASS, WR WHITE, JR HALL, ME AF ENGELMANN, RJ PENDERGRASS, WR WHITE, JR HALL, ME TI THE EFFECTIVENESS OF STATIONARY AUTOMOBILES AS SHELTERS IN ACCIDENTAL RELEASES OF TOXIC MATERIALS SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE SHELTERING; INHALATION; ACCIDENT (NUCLEAR); PLUTONIUM; EMERGENCY PLANNING; DOSE REDUCTION FACTOR AB The protection offered occupants of stationary automobiles against airborne gases and respirable particles such as might result from an accidental release, was measured and found to be substantial. For the four autos tested with the air conditioning (AC) system on and in recirculate position, the equilibrium ratios of inside/outside concentrations (I/O) for 2-mum diameter particles were less than 0.2 and some ratios were as small as 0.014. With both the AC compressor and the system fan off, the I/O for five autos ranged from 0.04 to 0.18. These low ratios are primarily a result of deposition within the autos. However, three of the five autos had substantially higher I/O ratios when the AC fan was on than when off, indicating that for some autos the AC caused significant added intake of outside air. Air exchange rates for the five stationary autos were on the order of 0.5 h-1 with AC off, and 2.5 h-1 with AC on. C1 NOAA,DIV ATMOSPHER TURBULENCE & DIFFUS,OAK RIDGE,TN 37831. OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830. RP ENGELMANN, RJ (reprint author), GLOBAL ATMOSPHER RESPONSE,11701 KAREN DR,POTOMAC,MD 20854, USA. NR 10 TC 9 Z9 9 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD DEC PY 1992 VL 26 IS 17 BP 3119 EP 3125 DI 10.1016/0960-1686(92)90469-2 PG 7 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA KC107 UT WOS:A1992KC10700008 ER PT J AU MASON, AS GIFFORD, FA AF MASON, AS GIFFORD, FA TI ATMOSPHERIC TRACER DISPERSION OVER A 24-H TIME SPAN SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE MODELING OF AEROSOLS; ATMOSPHERIC TRANSPORT; DIFFUSION ID RANDOM FORCE THEORY; DIFFUSION; SCALE AB Dust lofted by a large explosion was tagged with an elemental tracer and sampled by aircraft at times between 42 min and 24.5 h following the detonation. The tracer adhered to the finer particles of dust, and provided a sensitive technique for measuring the dispersion of the cloud. Over the entire time span, the tracer was diluted by factors ranging from 2.4 x 10(-4) to 1.6 x 10(-3). The dilution predicted by a random-force diffusion theory is 4.4 x 10(-4). Particle size analyses show the expected removal of larger dust particles over the time span. RP MASON, AS (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD DEC PY 1992 VL 26 IS 17 BP 3203 EP 3205 DI 10.1016/0960-1686(92)90476-2 PG 3 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA KC107 UT WOS:A1992KC10700015 ER PT J AU HOFFMAN, FO THIESSEN, KM FRANK, ML BLAYLOCK, BG AF HOFFMAN, FO THIESSEN, KM FRANK, ML BLAYLOCK, BG TI QUANTIFICATION OF THE INTERCEPTION AND INITIAL RETENTION OF RADIOACTIVE CONTAMINANTS DEPOSITED ON PASTURE GRASS BY SIMULATED RAIN SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Article DE ATMOSPHERIC DEPOSITION; INTERCEPTION; MODEL VALIDATION; RADIOACTIVITY; RAIN; RETENTION; VEGETATION ID TRANSPORT; ACCIDENT; MILK; AIR AB Simulated rain containing both soluble radionuclides and insoluble particles labeled with radionuclides was applied to pasture-type vegetation under conditions similar to those found during convective storms. The fraction of material in rain intercepted by vegetation and initially retained was determined for three sizes of insoluble polystyrene microspheres (3, 9 and 25 mum), soluble Be-7(2+) and soluble I-131 as periodate or iodide, over a range of rainfall amounts of both moderate- and high-intensity precipitation. Values for the interception and initial retention by vegetation (interception fractions) for soluble forms of I-131 in simulated rain are much less than those for insoluble particles and the reactive cation Be-7(2+). The interception fraction for soluble I-131 is an inverse function of rain amount, varying from about 0.3 at 1 mm rain to 0.006 at 30 mm. The mass interception factor (the interception fraction normalized for biomass) of I-131 is almost solely dependent on the amount of rain, with values from about 2.5 m 2 kg - 1 at 1 mm to less than 0. 1 m 2 kg - 1 at 30 mm; the I-131 vegetation-to-rain concentration ratio is relatively constant at approximately 2.6 l kg-1. For Be-7(2+) and the insoluble particles, the interception fractions range from 0.1 to 0.6 with geometric means of approximately 0.3. For these materials there is a greater dependence on biomass than on rain amount; the geometric means of the mass interception factors for these substances range from 0.99 to 2.4 M2 kg - 1, with no single variable being a major controlling factor. These results indicate that anionic I-131 is essentially removed with the water once the vegetation surface becomes saturated and that the Be-7 cation and the insoluble particles are adsorbed to or settle out on the plant surface. The discrepancy between the behavior of the anionic and the cationic species is consistent with a negative charge on the plant surface. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. NR 25 TC 24 Z9 24 U1 3 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0004-6981 J9 ATMOS ENVIRON A-GEN PD DEC PY 1992 VL 26 IS 18 BP 3313 EP 3321 PG 9 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA KG847 UT WOS:A1992KG84700009 ER PT J AU BENKOVITZ, CM THODE, HC AF BENKOVITZ, CM THODE, HC TI TRENDS ANALYSIS OF VEGETATION EXPOSURE INDEXES IN RURAL-AREAS OF THE UNITED-STATES - REPLY SO ATMOSPHERIC ENVIRONMENT PART A-GENERAL TOPICS LA English DT Discussion RP BENKOVITZ, CM (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 1 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 0004-6981 J9 ATMOS ENVIRON A-GEN PD DEC PY 1992 VL 26 IS 18 BP 3373 EP 3374 DI 10.1016/0960-1686(92)90353-M PG 2 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA KG847 UT WOS:A1992KG84700014 ER PT J AU BRIGGS, GA HUBER, AH SNYDER, WH THOMPSON, RS RAMSDELL, JV AF BRIGGS, GA HUBER, AH SNYDER, WH THOMPSON, RS RAMSDELL, JV TI DIFFUSION IN BUILDING WAKES FOR GROUND-LEVEL RELEASES - DISCUSSION SO ATMOSPHERIC ENVIRONMENT PART B-URBAN ATMOSPHERE LA English DT Discussion ID MODEL CUBE; FLOW C1 US EPA, ATMOSPHER RES & EXPOSURE ASSESSMENT LAB, RES TRIANGLE PK, NC 27711 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP BRIGGS, GA (reprint author), NOAA, AIR RESOURCES LAB, DIV ATMOSPHER SCI MODELLING, RES TRIANGLE PK, NC 27711 USA. NR 10 TC 3 Z9 4 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0957-1272 J9 ATMOS ENVIRON B-URB PD DEC PY 1992 VL 26 IS 4 BP 513 EP 517 DI 10.1016/0957-1272(92)90058-Z PG 5 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA KG848 UT WOS:A1992KG84800010 ER PT J AU VARRICCHIO, F UZIEL, M AF VARRICCHIO, F UZIEL, M TI COMPARISON OF SUPERNATANT-BOUND AND RIBOSOME-BOUND RAT-LIVER TRANSFER-RNA SO BIOCHEMISTRY INTERNATIONAL LA English DT Article ID AMINOACYL-TRANSFER RNA; PROTEIN-SYNTHESIS C1 NOVA UNIV,CTR LIFE SCI,FT LAUDERDALE,FL 33314. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN. NR 11 TC 0 Z9 0 U1 0 U2 0 PU ACADEMIC PRESS AUST PI MARRICKVILLE PA LOCKED BAG 16, MARRICKVILLE NSW 2204, AUSTRALIA SN 0158-5231 J9 BIOCHEM INT PD DEC PY 1992 VL 28 IS 6 BP 1039 EP 1044 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KK828 UT WOS:A1992KK82800009 PM 1290458 ER PT J AU WRIGHT, T AF WRIGHT, T TI A NOTE ON SAMPLING TO LOCATE RARE DEFECTIVES WITH STRONG PRIOR EVIDENCE SO BIOMETRIKA LA English DT Note DE BAYESIAN; PROBABILITY OF UNOBSERVED DEFECTIVES AB Inference about the number of defectives in a finite population is considered. Using a Bayesian model for computing the probability of unobserved defectives given the results of the sample, a criterion for sample size determination is introduced for two cases: (i) when there is a uniform prior, and (ii) when there is strong prior information. Depending on the value of the population size N, the savings in terms of a sampling effort rather than a census can be significant. When there is strong prior information, an explicit decision rule is given for determining whether a sample is needed or if the prior information alone is sufficient. RP WRIGHT, T (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,BLDG 6012,POB 2008,OAK RIDGE,TN 37831, USA. NR 15 TC 4 Z9 4 U1 0 U2 1 PU BIOMETRIKA TRUST PI LONDON PA UNIV COLLEGE LONDON GOWER ST-BIOMETRIKA OFFICE, LONDON, ENGLAND WC1E 6BT SN 0006-3444 J9 BIOMETRIKA JI Biometrika PD DEC PY 1992 VL 79 IS 4 BP 685 EP 691 DI 10.1093/biomet/79.4.685 PG 7 WC Biology; Mathematical & Computational Biology; Statistics & Probability SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology; Mathematics GA KJ239 UT WOS:A1992KJ23900003 ER PT J AU COOPER, DI EICHINGER, WE HOLTKAMP, DB KARL, RR QUICK, CR DUGAS, W HIPPS, L AF COOPER, DI EICHINGER, WE HOLTKAMP, DB KARL, RR QUICK, CR DUGAS, W HIPPS, L TI SPATIAL VARIABILITY OF WATER-VAPOR TURBULENT TRANSFER WITHIN THE BOUNDARY-LAYER SO BOUNDARY-LAYER METEOROLOGY LA English DT Article ID LIDAR AB Although the physics of evaporation within the inner region of the boundary layer is believed to be well understood, observations of mass-energy exchange processes have been hindered by the limitations of point sensors. A combination of point sensors and active remote sensing, namely, water-Raman Lidar measurements, offers new opportunities to study relatively large areas at temporal and spatial scales previously unattainable. Results from experiments over uniform canopies both confirm some traditional theories and challenge some of the underlying assumptions concerning the homogeneity of the surface-atmosphere interface and the use of point sensors to characterize large areas. C1 UTAH STATE UNIV,LOGAN,UT 84322. BLACKLAND RES CTR,TEMPLE,TX 76502. RP COOPER, DI (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. OI Hipps, Lawrence/0000-0002-7658-8571 NR 26 TC 25 Z9 25 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0006-8314 J9 BOUND-LAY METEOROL JI Bound.-Layer Meteor. PD DEC PY 1992 VL 61 IS 4 BP 389 EP 405 DI 10.1007/BF00119099 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KB246 UT WOS:A1992KB24600004 ER PT J AU GATES, WL AF GATES, WL TI AMIP - THE ATMOSPHERIC MODEL INTERCOMPARISON PROJECT SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article ID CLIMATE AB The Atmospheric Model Intercomparison Project (AMIP) is an international effort to determine the systematic climate errors of atmospheric models under realistic conditions, and calls for the simulation of the climate of the decade 1979 1988 using the observed monthly averaged distributions of sea surface temperature and sea ice as boundary conditions. Organized by the Working Group on Numerical Experimentation as a contribution to the World Climate Research Programme, AMIP involves the international atmospheric modeling community in a major test and intercomparison of model performance; in addition to an agreed-to set of monthly averaged output variables, each of the participating models will generate a daily history of state. These data will be stored and made available in standard format by the Program for Climate Model Diagnosis and Intercomparison at the Lawrence Livermore National Laboratory. Following completion of the computational phase of AMIP in 1993, emphasis will shift to a series of diagnostic sub-projects, now being planned, for the detailed examination of model performance and the simulation of specific physical processes and phenomena. AMIP offers an unprecedented opportunity for the comprehensive evaluation and validation of current atmospheric models, and is expected to provide valuable information for model improvement. RP GATES, WL (reprint author), LAWRENCE LIVERMORE NATL LAB,PROGRAM CLIMATE MODEL DIAG & INTERCOMPARISON,LIVERMORE,CA 94550, USA. NR 13 TC 778 Z9 787 U1 0 U2 14 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD DEC PY 1992 VL 73 IS 12 BP 1962 EP 1970 DI 10.1175/1520-0477(1992)073<1962:ATAMIP>2.0.CO;2 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KD665 UT WOS:A1992KD66500003 ER PT J AU PETERSEN, JH DEANGELIS, DL AF PETERSEN, JH DEANGELIS, DL TI FUNCTIONAL-RESPONSE AND CAPTURE TIMING IN AN INDIVIDUAL-BASED MODEL - PREDATION BY NORTHERN SQUAWFISH (PTYCHOCHEILUS-OREGONENSIS) ON JUVENILE SALMONIDS IN THE COLUMBIA RIVER SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID JOHN-DAY-RESERVOIR; STIZOSTEDION-VITREUM-VITREUM; FOOD-CONSUMPTION; LARGEMOUTH BASS; ONCORHYNCHUS-NERKA; SMALLMOUTH BASS; PREY-ENCOUNTER; TIME; FISHES; FREQUENCY AB The behavior of individual northern squawfish (Ptychocheilus oregonensis) preying on juvenile salmonids was modeled to address questions about capture rate and the timing of prey captures (random versus contagious). Prey density, predator weight, prey weight, temperature, and diel feeding pattern were first incorporated into predation equations analogous to Holling Type 2 and Type 3 functional response models. Type 2 and Type 3 equations fit field data from the Columbia River equally well, and both models predicted predation rates on five of seven independent dates. Selecting a functional response type may be complicated by variable predation rates, analytical methods, and assumptions of the model equations. Using the Type 2 functional response, random versus contagious timing of prey capture was tested using two related models. In the simpler model, salmon captures were assumed to be controlled by a Poisson renewal process; in the second model, several salmon captures were assumed to occur during brief ''feeding bouts'', modeled with a compound Poisson process. Salmon captures by individual northern squawfish were clustered through time, rather than random, based on comparison of model simulations and field data. The contagious-feeding result suggests that salmonids may be encountered as patches or schools in the river. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP PETERSEN, JH (reprint author), US FISH & WILDLIFE SERV,NATL FISHERIES RES CTR SEATTLE,COLUMBIA RIVER FIELD STN,COOK,WA 98605, USA. NR 78 TC 32 Z9 32 U1 1 U2 7 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD DEC PY 1992 VL 49 IS 12 BP 2551 EP 2565 DI 10.1139/f92-282 PG 15 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA KL532 UT WOS:A1992KL53200014 ER PT J AU GUCKERT, JB NOLD, SC BOSTON, HL WHITE, DC AF GUCKERT, JB NOLD, SC BOSTON, HL WHITE, DC TI PERIPHYTON RESPONSE IN AN INDUSTRIAL RECEIVING STREAM - LIPID-BASED PHYSIOLOGICAL STRESS-ANALYSIS AND PATTERN-RECOGNITION OF MICROBIAL COMMUNITY STRUCTURE SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID SEDIMENTS; PHOTOSYNTHESIS; METABOLISM; LARVAE; ALGAL AB Periphyton were collected from three physically similar sites on an industrial receiving stream which differed in their distances from the discharge. Previous studies had established that biological effects diminished with distance downstream from the discharges. In this study, a multivariate analysis of periphyton membrane lipid profiles quantitatively verified site-specific differences in time-independent microbial community structure qualitatively suggested by algal taxonomic analyses. There were no differences in periphyton abundance among sites. Periphyton physiology was evaluated using a C-14-labeled bicarbonate and H-3-labeled amino acids dual-label incubation, with subsequent analysis of carbon partitioning into lipid compartments. Total radiolabel uptake was similar for all sites. Physiological stress was shown to be highest at the site closest to the discharges using a membrane to storage lipid synthetic ratio. High values of this ratio indicated that both the phototrophic and heterotrophic constituents were stressed, and this stress declined with distance downstream. The ability to measure algal and bacterial abundance, community structure, activity, and physiological status from a single extraction provides a powerful method to evaluate periphyton which can serve as a useful biomonitoring and toxicity assessment tool for aquatic ecosystems. C1 UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37996. RP GUCKERT, JB (reprint author), PROCTER & GAMBLE CO,IVORYDALE TECH CTR,DEPT ENVIRONM SCI,5299 SPRING GROVE AVE,CINCINNATI,OH 45217, USA. NR 38 TC 30 Z9 30 U1 0 U2 5 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD DEC PY 1992 VL 49 IS 12 BP 2579 EP 2587 DI 10.1139/f92-285 PG 9 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA KL532 UT WOS:A1992KL53200017 ER PT J AU TOMEI, FA BARTON, LL LEMANSKI, CL ZOCCO, TG AF TOMEI, FA BARTON, LL LEMANSKI, CL ZOCCO, TG TI REDUCTION OF SELENATE AND SELENITE TO ELEMENTAL SELENIUM BY WOLINELLA-SUCCINOGENES SO CANADIAN JOURNAL OF MICROBIOLOGY LA English DT Note DE WOLINELLA; SELENIUM; CYTOLOGY; SELENATE ID BACTERIA; GLUTATHIONE; RESPIRATION; SEDIMENTS AB Cultures of Wolinella succinogenes were adapted to grow in the presence of 1 MM SeO32- or 10 mM SeO42-. Both selenium salts were reduced to red, amorphous, elemental selenium but only after the culture reached the stationary growth phase. Bacterial cells taken from a culture actively reducing selenium were examined by transmission electron microscopy and were found to have large, electron-dense granules in the cytoplasm. These granules were verified by energy-dispersive X-ray spectroscopy to consist of selenium. Wolinella succinogenes was unable to grow with SeO32-or SeO42- as the final electron acceptor. C1 UNIV NEW MEXICO,DEPT BIOL,MICROBIAL CHEM LAB,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RI Tomei Torres, Francisco/M-7472-2016 OI Tomei Torres, Francisco/0000-0002-5424-0355 NR 34 TC 60 Z9 64 U1 0 U2 14 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4166 J9 CAN J MICROBIOL JI Can. J. Microbiol. PD DEC PY 1992 VL 38 IS 12 BP 1328 EP 1333 PG 6 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology; Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology; Microbiology GA KJ165 UT WOS:A1992KJ16500018 ER PT J AU ZANGAR, RC SPRINGER, DL MCCRARY, JA NOVAK, RF PRIMIANO, T BUHLER, DR AF ZANGAR, RC SPRINGER, DL MCCRARY, JA NOVAK, RF PRIMIANO, T BUHLER, DR TI CHANGES IN ADULT METABOLISM OF AFLATOXIN-B1 IN RATS NEONATALLY EXPOSED TO DIETHYLSTILBESTROL - ALTERATIONS IN ALPHA-CLASS GLUTATHIONE S-TRANSFERASES SO CARCINOGENESIS LA English DT Article ID DNA-BINDING; MICROSOMAL CYTOCHROME-P-450; CHEMICAL CARCINOGENESIS; SUBUNIT COMPOSITION; LIVER; MOUSE; ACTIVATION; DETOXIFICATION; MODULATION; INHIBITION AB Neonatal exposure of rats to xenobiotics has been shown to produce long-term alterations in hepatic enzyme activities and in levels of DNA adducts following carcinogen exposure. We exposed newborn male rats to diethylstilbestrol (DES), pregnenolone-16alpha-carbonitrile, 7,12-dimethylbenz[a]anthracene or phenobarbital on days 1, 3 and 5 of age. At five months of age, males were injected with 1 mg/kg of [H-3]aflatoxin B1 (AFB1), killed after 2 h and examined for AF-DNA adduction in the liver. Males neonatally exposed to DES showed a 35% decrease in DNA adduction levels. Analysis of the adducted DNA bases failed to show any changes in relative proportions of individual adducts in the DES samples compared to controls. Hepatic glutathione concentrations were unchanged. However, Western blot analysis of alpha-class glutathione S-transferases (alphaGST), enzymes known to inactivate the toxic AFB1-8,9-epoxide, showed a 2-fold increase in subunit levels in the DES-treated males, suggesting that the detoxifying activity of the cytosol may have been increased. To confirm this, in vitro tests were undertaken using butylated hydroxyanisole (BHA) induced mouse microsomes to activate [H-3]AFB1 in the presence of treated cytosol and GSH. Analysis of metabolites by HPLC showed that DES-treated males formed 245% of the AFB-SG conjugate relative to vehicle controls. These results indicate that neonatal DES treatment resulted in long-term changes in basal alphaGST levels and suggest that these changes were responsible for lower levels of DNA adduction following adult exposure to AFB1. C1 OREGON STATE UNIV, TOXICOL PROGRAM, CORVALLIS, OR 97331 USA. PACIFIC NW LAB, DEPT BIOL & CHEM, RICHLAND, WA 99352 USA. FT VALLEY STATE UNIV, DEPT BIOL, FT VALLEY, GA 31030 USA. WAYNE STATE UNIV, INST CHEM TOXICOL, DETROIT, MI 48201 USA. RP BUHLER, DR (reprint author), OREGON STATE UNIV, TOXICOL PROGRAM, CORVALLIS, OR 97331 USA. FU NIEHS NIH HHS [ES-00210] NR 44 TC 13 Z9 15 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0143-3334 J9 CARCINOGENESIS JI Carcinogenesis PD DEC PY 1992 VL 13 IS 12 BP 2375 EP 2379 DI 10.1093/carcin/13.12.2375 PG 5 WC Oncology SC Oncology GA KD322 UT WOS:A1992KD32200029 PM 1473247 ER PT J AU VAUGHAN, GBM HEINEY, PA COX, DE MCGHIE, AR JONES, DR STRONGIN, RM CICHY, MA SMITH, AB AF VAUGHAN, GBM HEINEY, PA COX, DE MCGHIE, AR JONES, DR STRONGIN, RM CICHY, MA SMITH, AB TI THE ORIENTATIONAL PHASE-TRANSITION IN SOLID BUCKMINSTERFULLERENE EPOXIDE (C60O) SO CHEMICAL PHYSICS LA English DT Article ID CRYSTAL-STRUCTURE; FULLERENES; FRAMEWORK; ADDUCTS AB Crystalline C60O, the first fullerene epoxide, has been studied using calorimetry and high resolution powder X-ray diffraction. At room temperature, C60O is orientationally disordered with a face-centered cubic lattice, a = 14.185 angstrom. Upon cooling, an orientational ordering transition at 278 K leads to a low temperature simple cubic phase. At 19 K, this phase is qualitatively similar to the orientationally ordered Pa3BAR phase of C60, with a = 14.062 angstrom, but with additional randomness due to a distribution of orientations of the oxygen bonds. C1 UNIV PENN,DEPT CHEM,PHILADELPHIA,PA 19104. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV PENN,RES STRUCT MATTER LAB,PHILADELPHIA,PA 19104. RI Vaughan, Gavin/B-1479-2010; Strongin, Robert/F-1026-2010 NR 31 TC 59 Z9 59 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD DEC 1 PY 1992 VL 168 IS 1 BP 185 EP 193 DI 10.1016/0301-0104(92)80119-G PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JZ509 UT WOS:A1992JZ50900017 ER PT J AU PHILLIPS, NE FISHER, RA GORDON, JE AF PHILLIPS, NE FISHER, RA GORDON, JE TI THE SPECIFIC-HEAT OF YBA2CU3O7 SO CHINESE JOURNAL OF PHYSICS LA English DT Review ID SUPERCONDUCTIVITY; TRANSITION; ORIGIN; TERM AB We review the experimental evidence suggests that substantial fractions of typical YBa2Cu3O7 samples are non-superconducting; that the non-superconducting, inclusions are of dimensions of a lattice parameter; that the non-superconducting inclusions are associated with Cu2+ magnetic moments; and that the linear term in the specific heat is not an 'intrinsic" property but is associated with the presence of these Cu2+ magnetic moments and impurity phases. A preliminary result on the effect of heat treatment on the volume fraction of superconductivity is also presented. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. AMHERST COLL,DEPT PHYS,AMHERST,MA 01002. RP PHILLIPS, NE (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 15 TC 4 Z9 4 U1 0 U2 0 PU PHYSICAL SOC REPUBLIC CHINA PI TAIPEI PA CHINESE JOURNAL PHYSICS PO BOX 23-30, TAIPEI 10764, TAIWAN SN 0577-9073 J9 CHINESE J PHYS JI Chin. J. Phys. PD DEC PY 1992 VL 30 IS 6 BP 799 EP 807 PG 9 WC Physics, Multidisciplinary SC Physics GA KB793 UT WOS:A1992KB79300001 ER PT J AU MASRI, AR DIBBLE, RW BARLOW, RS AF MASRI, AR DIBBLE, RW BARLOW, RS TI CHEMICAL KINETIC EFFECTS IN NONPREMIXED FLAMES OF H-2/CO-2 FUEL SO COMBUSTION AND FLAME LA English DT Article ID PROBABILITY DENSITY-FUNCTIONS; DIFFUSION FLAMES; JET FLAMES; METHANE; EXTINCTION; COMBUSTION; CO/H-2/N-2 AB Finite rate chemical kinetic effects are investigated in diffusion flames of H-2/CO2 fuel. The CO2 diluent is not totally inert since at high temperature some of it will react to give CO. Calculations of laminar flames and measurements in turbulent flames are presented. The calculations are performed, using a detailed chemical kinetic mechanism with 13 species and 34 chemical reactions. The structure of laminar counterflow diffusion flames with a range of stretch rates are calculated. Using the joint Raman-Rayleigh-LIF technique, simultaneous space- and time-resolved measurements of temperature and the Raman scattering from CO, CO2, H-2, H2O, O2, and N2, as well as laser-induced fluorescence (LIF) from OH have been made in turbulent nonpremixed flames of H2/CO2. As these flames are pilot-stabilized they blow off, at high enough jet velocities, in a region down stream of the pilot where turbulent mixing rates are high and the finite rate chemistry effects are significant. It is found that for laminar flames with low stretch rates, the peak calculated temperatures exceed the equilibrium temperature and the peak temperatures measured in turbulent flames. This is mainly due to differential diffusion effects that are substantial in the laminar flame calculations and cause hydrogen enrichment of lean mixtures. Such effects are not as significant in turbulent flames. The hydrogen radical plays a major role at extinction, where the competition is verv intense between the formation-destruction processes within the reaction zone and diffusive processes towards nonreactive regions. In laminar flames, the radicals OH, H, and O are in superequilibrium concentrations regardless of the stretch rates. Measurements in turbulent flames show that the hydroxyl radical is in superequilibrium concentrations as well. The turbulent's flame approach to global blowoff is monomodal. Local extinction in turbulent flames increases very sharply only in the flame's final approach to blowoff when the jet velocities are greater than approximately 90% of the blowoff velocity. C1 UNIV CALIF BERKELEY,DEPT MECH ENGN,BERKELEY,CA 94720. SANDIA NATL LABS,COMBUST RES FAC,LIVERMORE,CA 94550. RP MASRI, AR (reprint author), UNIV SYDNEY,DEPT MECH ENGN,SYDNEY,NSW 2006,AUSTRALIA. NR 36 TC 56 Z9 56 U1 0 U2 13 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD DEC PY 1992 VL 91 IS 3-4 BP 285 EP 309 DI 10.1016/0010-2180(92)90059-X PG 25 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA JZ309 UT WOS:A1992JZ30900006 ER PT J AU JOHNSON, RW MACKINNON, RJ AF JOHNSON, RW MACKINNON, RJ TI EQUIVALENT VERSIONS OF THE QUICK SCHEME FOR FINITE-DIFFERENCE AND FINITE-VOLUME NUMERICAL-METHODS SO COMMUNICATIONS IN APPLIED NUMERICAL METHODS LA English DT Article ID CONVECTION AB A recent article by Leonard and Mokhtari (1990) discusses the order of accuracy of discrete equations used for numerical simulation. They maintain that discrete operators derived for the finite-volume method should be Taylor-series-analysed using the various points that appear in a finite-volume discrete equation. The current paper argues that any discrete scheme must be analysed from a single point. It is shown that while Leonard's finite-difference QUICK scheme is O(h3)-accurate, his implementation of QUICK for the finite-volume method is only O(h2). An alternative finite-volume formulation is shown to yield a locally third-order-accurate operator in the final discrete equation. Also, third-order-accurate formulae are discussed for various numerical implementations. Numerical examples are included to demonstrate actual rates of convergence for various operators. RP JOHNSON, RW (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 13 TC 12 Z9 13 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0748-8025 J9 COMMUN APPL NUMER M PD DEC PY 1992 VL 8 IS 12 BP 841 EP 847 DI 10.1002/cnm.1630081202 PG 7 WC Engineering, Multidisciplinary; Mathematics, Applied SC Engineering; Mathematics GA KD319 UT WOS:A1992KD31900001 ER PT J AU MACKINNON, RJ JOHNSON, RW LANGERMAN, MA AF MACKINNON, RJ JOHNSON, RW LANGERMAN, MA TI A HIGHER-ORDER ACCURATE PETROV-GALERKIN FINITE-ELEMENT METHOD FOR ELLIPTIC BOUNDARY-VALUE-PROBLEMS SO COMMUNICATIONS IN APPLIED NUMERICAL METHODS LA English DT Article ID EQUATION AB We formulate a higher-order (superconvergent) Petrov-Galerkin method by determining, using a finite-difference approximation, the optimal selection of quadratic and cubic modifications to the standard linear test function for bilinear elements. Application of this method to linear elliptic problems results in improved accuracy and higher rates of convergence for problems with constant coefficients and improved accuracy for problems with variable coefficients. Supporting numerical examples are given. RP MACKINNON, RJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0748-8025 J9 COMMUN APPL NUMER M PD DEC PY 1992 VL 8 IS 12 BP 869 EP 874 DI 10.1002/cnm.1630081205 PG 6 WC Engineering, Multidisciplinary; Mathematics, Applied SC Engineering; Mathematics GA KD319 UT WOS:A1992KD31900004 ER PT J AU OGIEVETSKY, O SCHMIDKE, WB WESS, J ZUMINO, B AF OGIEVETSKY, O SCHMIDKE, WB WESS, J ZUMINO, B TI Q-DEFORMED POINCARE ALGEBRA SO COMMUNICATIONS IN MATHEMATICAL PHYSICS LA English DT Article ID QUANTUM AB The q-differential calculus for the q-Minkowski space is developed. The algebra of the q-derivatives with the q-Lorentz generators is found giving the q-deformation of the, Poincare algebra. The reality structure of the q-Poincare algebra is given. The reality structure of the q-differentials is also found. The real Laplacian is constructed. Finally the comultiplication, counit and antipode for the q-Poincare algebra are obtained making it a Hopf algebra. C1 LAWRENCE BERKELEY LAB,DEPT PHYS,THEORET PHYS GRP,BERKELEY,CA 94720. UNIV MUNICH,PHYS SECT,W-8000 MUNICH 2,GERMANY. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP OGIEVETSKY, O (reprint author), WERNER HEISENBERG INST PHYS,MAX PLANCK INST PHYS & ASTROPHYS,POB 401212,W-8000 MUNICH 40,GERMANY. RI Ogievetsky, Oleg/N-4540-2015 NR 13 TC 163 Z9 163 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0010-3616 J9 COMMUN MATH PHYS JI Commun. Math. Phys. PD DEC PY 1992 VL 150 IS 3 BP 495 EP 518 DI 10.1007/BF02096958 PG 24 WC Physics, Mathematical SC Physics GA KC356 UT WOS:A1992KC35600003 ER PT J AU CARLSON, RE FOLEY, TA AF CARLSON, RE FOLEY, TA TI INTERPOLATION OF TRACK DATA WITH RADIAL BASIS METHODS SO COMPUTERS & MATHEMATICS WITH APPLICATIONS LA English DT Article ID SCATTERED DATA AB The multiquadric and thin plate spline radial basis methods, together with the triangle-based minimum norm network algorithm and the modified quadratic Shepards' method, are applied to various sets of data that are sampled densely along tracks in the plane. The effectiveness of these methods on track data has been questioned in the past. We observe that both radial basis methods and the minimum norm network method performed well on smoothly varying track data sets, while the multiquadric method with a small value for the parameter R2 was the only method that was effective on rapidly varying track data. C1 ARIZONA STATE UNIV,DEPT COMP SCI,TEMPE,AZ 85287. RP CARLSON, RE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 17 TC 23 Z9 23 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0898-1221 J9 COMPUT MATH APPL JI Comput. Math. Appl. PD DEC PY 1992 VL 24 IS 12 BP 27 EP 34 DI 10.1016/0898-1221(92)90169-I PG 8 WC Mathematics, Applied SC Mathematics GA JX539 UT WOS:A1992JX53900007 ER PT J AU KANSA, EJ CARLSON, RE AF KANSA, EJ CARLSON, RE TI IMPROVED ACCURACY OF MULTIQUADRIC INTERPOLATION USING VARIABLE SHAPE-PARAMETERS SO COMPUTERS & MATHEMATICS WITH APPLICATIONS LA English DT Article ID SCATTERED DATA; APPROXIMATION AB Given N scattered data points, we examined the problem of finding N variable Multiquadric (MQ) shape-parameters, or R2 values. Because the problem of funding the optimal R2 values is a nonlinear one, we optimized these parameters numerically by minimizing the root-mean-square (RMS) errors. The resulting R2 values varied over many orders of magnitude. We have tested this approach on a number of univariate and bivariate (Franke's) problems, and found that the RMS error reduction was substantial. RP KANSA, EJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 14 TC 75 Z9 79 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0898-1221 J9 COMPUT MATH APPL JI Comput. Math. Appl. PD DEC PY 1992 VL 24 IS 12 BP 99 EP 120 DI 10.1016/0898-1221(92)90174-G PG 22 WC Mathematics, Applied SC Mathematics GA JX539 UT WOS:A1992JX53900012 ER PT J AU KANSA, EJ AF KANSA, EJ TI ADVANCES IN THE THEORY AND APPLICATIONS OF RADIAL BASIS FUNCTIONS - PREFACE SO COMPUTERS & MATHEMATICS WITH APPLICATIONS LA English DT Editorial Material ID SCATTERED DATA; INTERPOLATION RP KANSA, EJ (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-200,LIVERMORE,CA 94551, USA. NR 4 TC 7 Z9 7 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0898-1221 J9 COMPUT MATH APPL JI Comput. Math. Appl. PD DEC PY 1992 VL 24 IS 12 BP R7 EP R7 DI 10.1016/0898-1221(92)90163-C PG 1 WC Mathematics, Applied SC Mathematics GA JX539 UT WOS:A1992JX53900001 ER PT J AU WEST, HB GARCIA, MO GERLACH, DC ROMANO, J AF WEST, HB GARCIA, MO GERLACH, DC ROMANO, J TI GEOCHEMISTRY OF THOLEIITES FROM LANAI, HAWAII SO CONTRIBUTIONS TO MINERALOGY AND PETROLOGY LA English DT Article ID RARE-EARTH ELEMENTS; LOWER CRUSTAL XENOLITHS; EAST PACIFIC RISE; TRACE-ELEMENT; KILAUEA VOLCANO; OCEANIC BASALTS; PARTITION-COEFFICIENTS; ISOTOPIC CONSTRAINTS; MAGMA GENESIS; UPPER MANTLE AB Lanai is the third smallest of the fifteen principal subaerial shield volcanoes of the Hawaiian hotspot. This volcano apparently became extinct during the shield-building stage of volcanism, as shown by the absence of both alkalic cap and post-erosional lavas. Major and trace element analyses of 22 new samples collected primarily from 3 stratigraphic sections show that Lanai tholeiites span a large range in composition. Some Lanai lavas are unique geochemically among Hawaiian tholeiites in having the lowest abundances of incompatible trace elements of any Hawaiian lavas and well-developed positive Eu anomalies. The geochemical characteristics of these low-abundance Lanai tholeiites are not the result of alteration, differences in mantle source modal mineralogy, the presence of residual accessory mantle phases or fractional crystallization of such phases, assimilation of depleted [MORB] wall-rock, or accumulation/resorption of phenocrysts or xenocrysts. Incompatible trace element ratios (e.g., Nb/La, Nb/Th, La/Th, La/Hf, Ce/Pb) in Lanai tholeiites span considerable ranges and form coherent trends with each other and with absolute abundances of these elements. Large variations in La/Sm, La/Yb, and absolute REE abundances at constant MgO suggest that Lanai tholeiites formed by variable amounts of partial melting. However, large ranges in incompatible element ratios cannot be explained solely by variations in partial melting of a geochemically homogeneous source, but must reflect geochemical heterogeneities in the Lanai source. Partial melting modeling indicates that the mixed Lanai source is probably LREE-enriched [i.e., (La/Yb)CN > 1]. One component in the Lanai source, exemplified by the low-abundance tholeiites, has markedly lower REE/HFSE, Th/HFSE, alkali/HFSE, and Ce/Pb ratios than other Lanai or Hawaiian tholeiites and may indicate the presence of recycled residual subduction zone materials in the Hawaiian plume source. The positive Eu anomalies that characterize the low-abundance Lanai tholeiites are not the result of plagioclase accumulation or assimilation but are a feature of this source component. Progressive temporal geochemical variations in Lanai tholeiites from 2 stratigraphic sections indicate that the source composition of these lavas probably evolved over time. This change could have resulted from a progressive decrease in the extent of partial melting of the Lanai source. The compositional variability of Lanai tholeiites suggests that geochemical heterogeneities in their source are larger than the scale of partial melting. Lanai tholeiites could not have formed by smaller degrees of partial melting of plume material than did the larger-volume Hawaiian shields. Therefore, volume differences between Hawaiian shields must be controlled primarily by differences in the volume of supplied plume material rather than by differences in the degree of partial melting. The premature cessation of eruptive activity at Lanai may be attributed to relatively large degrees of partial melting of a small plume. C1 UNIV HAWAII,DEPT GEOL & GEOPHYS,HONOLULU,HI 96822. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WEST, HB (reprint author), UNIV HAWAII,HAWAII INST GEOPHYS,HONOLULU,HI 96822, USA. NR 133 TC 40 Z9 42 U1 0 U2 4 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0010-7999 J9 CONTRIB MINERAL PETR JI Contrib. Mineral. Petrol. PD DEC PY 1992 VL 112 IS 4 BP 520 EP 542 DI 10.1007/BF00310782 PG 23 WC Geochemistry & Geophysics; Mineralogy SC Geochemistry & Geophysics; Mineralogy GA KA987 UT WOS:A1992KA98700007 ER PT J AU SIMMONS, JW ATTERIDGE, DG BRUEMMER, SM AF SIMMONS, JW ATTERIDGE, DG BRUEMMER, SM TI CONTINUOUS COOLING SENSITIZATION OF TYPE-316 AUSTENITIC STAINLESS-STEEL SO CORROSION LA English DT Article DE CONTINUOUS COOLING SENSITIZATION; PRECIPITATION; RECOVERY; STAINLESS STEEL; STRAIN ID COLD WORK; DEFORMATION AB The continuous cooling sensitization (CCS) behavior of a high-carbon type 316 (UNS S31600) austenitic stainless steel has been quantified as a function of peak cycle temperature, cooling rate, and prior deformation. A critical peak temperature effect was observed such that maximum temperatures either above or below 950-degrees-C generally resulted in lower degree of sensitization (DOS) values. CCS development increased with decreasing cooling rates and occurred primarily in the critical range between 900 and 750-degrees-C. Peak cycle temperatures of 1,000 and 1,050-degrees-C suppressed carbide nucleation and sensitization development during cooling to lower temperatures. Prior deformation in the range of 5 to 20% significantly enhanced sensitization development with the measured DOS generally increasing as prior strain increased. Recovery was initiated in the strained materials when cycle peak temperatures reached or exceeded approximately 900-degrees-C and played an important role in reducing subsequent sensitization development. In certain cases, prior strain values of 20% were only as effective as 10% in enhancing sensitization development because of the effects of recovery. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP SIMMONS, JW (reprint author), OREGON GRAD INST SCI & TECHNOL, 19600 NW VON NEUMANN DR, BEAVERTON, OR 97006 USA. NR 27 TC 6 Z9 6 U1 1 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD DEC PY 1992 VL 48 IS 12 BP 976 EP 982 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KF414 UT WOS:A1992KF41400002 ER PT J AU HOU, PY SHUI, ZR STRINGER, J AF HOU, PY SHUI, ZR STRINGER, J TI OXIDATION BEHAVIOR OF CO-15WT-PERCENT CR ALLOY CONTAINING DISPERSED OXIDES FORMED BY INTERNAL OXIDATION SO CORROSION LA English DT Article DE CHROMIA SCALES; HIGH-TEMPERATURE OXIDATION; INTERNAL OXIDATION; REACTIVE ELEMENT EFFECT; SELECTIVE OXIDATION; SILICON ID HIGH-TEMPERATURE OXIDATION; CHROMIUM-ALLOYS; BASE ALLOYS; SILICON; COBALT AB Internal oxidation pretreatments of Co-15wt%Cr and Co-15wt%Cr-1wt%Ti were carried out using a Rhines pack in quartz, in mullite, and in alumina. A dispersion of titanium oxide particles formed in the Ti-containing alloy as a result of the internal oxidation. However, silicon also diffused into all treated specimens when the pretreatments were carried out in quartz or in mullite. The effect of various pretreatments on the subsequent oxidation of these alloys was studied at 1,000-degrees-C and compared with that of a Co-15wt%Cr-1wt%Si alloy. The main purpose of this study was to determine the relative effectiveness of the dispersed oxide particles and the contaminated silicon on the selective oxidation of chromium. It was found that the oxidation behaviors of both treated alloys were strongly affected by the degree of silicon contamination. Selective oxidation of chromium to form a nearly continuous protective Cr2O3 scale was achieved with greater than 0.4 wt% silicon. The presence of dispersed particles reduced initial oxidation rate but was ineffective in Promoting Cr2O3 scale formation. C1 ELECT POWER RES INST,PALO ALTO,CA 94304. RP HOU, PY (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 23 TC 0 Z9 0 U1 0 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD DEC PY 1992 VL 48 IS 12 BP 990 EP 1000 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KF414 UT WOS:A1992KF41400004 ER PT J AU SPENCE, JW HAYNIE, FH LIPFERT, FW CRAMER, SD MCDONALD, LG AF SPENCE, JW HAYNIE, FH LIPFERT, FW CRAMER, SD MCDONALD, LG TI ATMOSPHERIC CORROSION MODEL FOR GALVANIZED STEEL STRUCTURES SO CORROSION LA English DT Article ID ACID DEPOSITION; PAINTS; PH AB This report develops a model for predicting the corrosion of galvanized steel structures based on two competing mechanisms: the formation and dissolution of the basic zinc-carbonate film that forms on zinc surfaces. The model consists of a diffusivity term that describes film growth and a dissolution term that describes the rate of film removal Dissolution becomes the rate-determining process for predicting the long-term corrosion behavior of galvanized steel structures. Components of the dissolution term were evaluated with data collected from field exposure experiments that were designed to separate the effects of wet and dry acidic deposition from the effects of normal weathering of galvanized steel specimens. The model's dissolution term predicted the long-term corrosion of galvanized steel with reasonable accuracy For further evaluation, the dissolution model was applied to historical, long-term corrosion data of galvanized steel products, taking into account their sizes and shapes. The field data used in this evaluation were consistent with corrosion rates predicted by the model, within the limits of uncertainty of the environmental data. Thus, the model can be used with reasonable confidence to predict corrosion behavior of different structures if environmental conditions can be properly described. C1 BROOKHAVEN NATL LAB, DEPT APPL SCI, UPTON, NY 11973 USA. US DEPT INTERIOR, BUR MINES, ALBANY, OR USA. RP SPENCE, JW (reprint author), US EPA, RES TRIANGLE PK, NC 27711 USA. NR 38 TC 36 Z9 39 U1 1 U2 3 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD DEC PY 1992 VL 48 IS 12 BP 1009 EP 1019 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KF414 UT WOS:A1992KF41400006 ER PT J AU JACK, RF RINGELBERG, DB WHITE, DC AF JACK, RF RINGELBERG, DB WHITE, DC TI DIFFERENTIAL CORROSION RATES OF CARBON-STEEL BY COMBINATIONS OF BACILLUS SP, HAFNIA-ALVEI AND DESULFOVIBRIO-GIGAS ESTABLISHED BY PHOSPHOLIPID ANALYSIS OF ELECTRODE BIOFILM SO CORROSION SCIENCE LA English DT Article ID ANAEROBIC CORROSION; BACTERIA AB The corrosion rates of carbon steel by monocultures and various combinations of aerobic (Bacillus sp.), fermentative (Hafnia alvei) and sulfate-reducing (Desulfovibrio gigas) bacterial biofilms in an aerobic, continuously flowing freshwater reactor containing 0.4 mM sulfate showed marked differences. Biofilm formation and electrode colonization resulted in decreases in the open circuit potential (OCP). The corrosion rate was measured non-destructively as the admittance (1/R(ct)) by electrochemical impedance spectroscopy (EIS) on a four sided working electrode which allowed estimates of the reproducibility. The monocultures each induced greater corrosion initially but with time the rates of corrosion decreased to that of the sterile control. The D. gigas was unable to grow in the bulk phase but formed an apparently non-living biofilm. The admittance (the measure of corrosion) was greatest when the sulfate-reducing bacterium, D. gigas, was present in a consortium. The consortia containing D. gigas + H. alvei showed a significantly higher corrosion rate than the triculture or the other dicultures. The microbial biomass and the bacterial community structure actually on the electrode surfaces were examined by viable counts, most probable number (MPN) estimations and phospholipid fatty acid (PLFA) profiles determined after extraction and gas chromatographic analysis. The rate of corrosion was not directly related to the total microbial biomass or the number of species on the coupon. The rate of corrosion did not depend on the ratio of heterotrophic to sulfate-reducing bacteria (SRB) or absolute number of SRB. The PLFA analysis showed the organisms on the working electrodes were more stressed/starved than when grown in the bulk phase for inocula. This study demonstrates that different combinations of bacteria growing on the same substrata (electrode) in the same bulk phase induce very different corrosion rates. The maximum corrosion rate with the isolate combinations was within 70% of an enrichment with a community composition (determined by PLFA analysis) like that of the native corrosion tubercules. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN. RP JACK, RF (reprint author), UNIV TENNESSEE,DEPT MICROBIOL,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932, USA. NR 13 TC 47 Z9 52 U1 0 U2 12 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0010-938X J9 CORROS SCI JI Corrosion Sci. PD DEC PY 1992 VL 33 IS 12 BP 1843 EP 1853 DI 10.1016/0010-938X(92)90188-9 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JY608 UT WOS:A1992JY60800002 ER PT J AU ADLER, TA WALTERS, RP AF ADLER, TA WALTERS, RP TI CORROSION AND WEAR OF 304-STAINLESS STEEL USING A SCRATCH TEST SO CORROSION SCIENCE LA English DT Article ID 304L STAINLESS-STEEL; REPASSIVATION KINETICS; ABRASIVE WEAR; EROSION CORROSION; ALUMINUM-ALLOYS; PASSIVE FILMS; CAST-IRON; GROWTH; MEDIA; FLOW AB A scratch test developed by the U.S. Bureau of Mines was used to wear the surface of 304 stainless steel. Corrosion of the freshly exposed surface was measured by the charge density consumed in reforming the passive film. Wear was measured by integrating the area between the profile of the scratch and the original surface. Neither scratch hardness (resistance to plastic deformation) nor wear were affected by the presence or absence of the passive film. For rubbing wear, a mode where the surface is plastically deformed and no debris is formed, the passive film remained adherent to the surface. RP ADLER, TA (reprint author), US BUR MINES,ALBANY RES CTR,1450 QUEEN AVE SW,ALBANY,OR 97321, USA. NR 42 TC 38 Z9 38 U1 0 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0010-938X J9 CORROS SCI JI Corrosion Sci. PD DEC PY 1992 VL 33 IS 12 BP 1855 EP 1876 DI 10.1016/0010-938X(92)90189-A PG 22 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JY608 UT WOS:A1992JY60800003 ER PT J AU GAO, DY MAZUR, P KLEINHANS, FW WATSON, PF NOILES, EE CRITSER, JK AF GAO, DY MAZUR, P KLEINHANS, FW WATSON, PF NOILES, EE CRITSER, JK TI GLYCEROL PERMEABILITY OF HUMAN SPERMATOZOA AND ITS ACTIVATION-ENERGY SO CRYOBIOLOGY LA English DT Article ID INSEMINATION; SEMEN; FRESH; DONOR C1 INDIANA UNIV,SCH MED,DEPT PHYSIOL & BIOPHYS,INDIANAPOLIS,IN 46202. INDIANA UNIV,SCH MED,DEPT OBSTET & GYNECOL,INDIANAPOLIS,IN 46202. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. INDIANA UNIV PURDUE UNIV,DEPT PHYS,INDIANAPOLIS,IN 46205. UNIV LONDON ROYAL VET COLL,DEPT VET BASIC SCI,LONDON NW1 0TU,ENGLAND. RP GAO, DY (reprint author), METHODIST HOSP INDIANA,CTR REPROD & TRANSPLANTAT IMMUNOL,INDIANAPOLIS,IN 46202, USA. FU NICHD NIH HHS [HD 25949] NR 27 TC 39 Z9 41 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 0011-2240 J9 CRYOBIOLOGY JI Cryobiology PD DEC PY 1992 VL 29 IS 6 BP 657 EP 667 DI 10.1016/0011-2240(92)90068-D PG 11 WC Biology; Physiology SC Life Sciences & Biomedicine - Other Topics; Physiology GA KA528 UT WOS:A1992KA52800001 PM 1478095 ER PT J AU DENG, YF GLIMM, J SHARP, DH AF DENG, YF GLIMM, J SHARP, DH TI PERSPECTIVES ON PARALLEL COMPUTING SO DAEDALUS LA English DT Article C1 SUNY STONY BROOK,DEPT APPL MATH & STAT,STONY BROOK,NY 11794. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87544. RP DENG, YF (reprint author), SUNY STONY BROOK,DEPT APPL MATH & STAT,STONY BROOK,NY 11794, USA. NR 3 TC 4 Z9 4 U1 1 U2 1 PU DAEDALUS PI CAMBRIDGE PA 136 IRVING ST, STE 100, CAMBRIDGE, MA 02138 SN 0011-5266 J9 DAEDALUS JI Daedalus PD WIN PY 1992 VL 121 IS 1 BP 31 EP 52 PG 22 WC Humanities, Multidisciplinary; Social Sciences, Interdisciplinary SC Arts & Humanities - Other Topics; Social Sciences - Other Topics GA GX489 UT WOS:A1992GX48900004 ER PT J AU HASSLACHER, B AF HASSLACHER, B TI PARALLEL BILLIARDS AND MONSTER SYSTEMS SO DAEDALUS LA English DT Article RP HASSLACHER, B (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87544, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU DAEDALUS PI CAMBRIDGE PA 136 IRVING ST, STE 100, CAMBRIDGE, MA 02138 SN 0011-5266 J9 DAEDALUS JI Daedalus PD WIN PY 1992 VL 121 IS 1 BP 53 EP 65 PG 13 WC Humanities, Multidisciplinary; Social Sciences, Interdisciplinary SC Arts & Humanities - Other Topics; Social Sciences - Other Topics GA GX489 UT WOS:A1992GX48900005 ER PT J AU METROPOLIS, N AF METROPOLIS, N TI THE AGE OF COMPUTING - A PERSONAL MEMOIR SO DAEDALUS LA English DT Article RP METROPOLIS, N (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 0 TC 2 Z9 2 U1 2 U2 3 PU DAEDALUS PI CAMBRIDGE PA 136 IRVING ST, STE 100, CAMBRIDGE, MA 02138 SN 0011-5266 J9 DAEDALUS JI Daedalus PD WIN PY 1992 VL 121 IS 1 BP 119 EP 130 PG 12 WC Humanities, Multidisciplinary; Social Sciences, Interdisciplinary SC Arts & Humanities - Other Topics; Social Sciences - Other Topics GA GX489 UT WOS:A1992GX48900010 ER PT J AU ADAMS, SM CRUMBY, WD GREELEY, MS SHUGART, LR SAYLOR, CF AF ADAMS, SM CRUMBY, WD GREELEY, MS SHUGART, LR SAYLOR, CF TI RESPONSES OF FISH POPULATIONS AND COMMUNITIES TO PULP-MILL EFFLUENTS - A HOLISTIC ASSESSMENT SO ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY LA English DT Article ID SALMON ONCORHYNCHUS-KISUTCH; SEMILUNAR SPAWNING CYCLES; FUNDULUS-GRANDIS BAIRD; BALTIC COASTAL FISH; CARBOHYDRATE-METABOLISM; AQUATIC ECOSYSTEMS; PERCA-FLUVIATILIS; GULF KILLIFISH; ACUTE EXPOSURE; OOCYTE GROWTH C1 TENNESSEE VALLEY AUTHOR,AQUAT BIOL LAB,NORRIS,TN 37828. RP ADAMS, SM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Greeley, Mark/D-2330-2016 OI Greeley, Mark/0000-0002-6088-5942 NR 54 TC 97 Z9 100 U1 0 U2 7 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0147-6513 J9 ECOTOX ENVIRON SAFE JI Ecotox. Environ. Safe. PD DEC PY 1992 VL 24 IS 3 BP 347 EP 360 PG 14 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA KG129 UT WOS:A1992KG12900011 PM 1282880 ER PT J AU PASSALACQUA, E ANTONUCCI, PL VIVALDI, M PATTI, A ANTONUCCI, V GIORDANO, N KINOSHITA, K AF PASSALACQUA, E ANTONUCCI, PL VIVALDI, M PATTI, A ANTONUCCI, V GIORDANO, N KINOSHITA, K TI THE INFLUENCE OF PT ON THE ELECTROOXIDATION BEHAVIOR OF CARBON IN PHOSPHORIC-ACID SO ELECTROCHIMICA ACTA LA English DT Article DE CARBON CORROSION; PT DISSOLUTION; FUEL CELLS; CYCLIC VOLTAMMETRY; PHOSPHORIC ACID ID FUEL-CELL; PLATINUM; GRAPHITE; GASIFICATION; OXIDATION; OXYGEN; REDUCTION; CATALYSTS; OXIDES; STEAM AB The electrooxidation behaviour of Pt/C catalysts for phosphoric acid fuel cells (PAFC) has been investigated by potentiostatic tests in the potential range 0.6 divided-by 1.0 V (rhe). Results indicate that the corrosion rate increases with an increase in Pt content, and is most noticeable at 0.6 V. At higher potentials anodic dissolution of Pt takes place, thus no metal is available to catalyze the corrosion of carbon. It is concluded that a definite influence of the presence of the supported metal on the extent of carbon corrosion under practical conditions does exist, but the understanding of mechanisms involved in the Pt-promoted carbon corrosion requires further studies. C1 UNIV REGGIO CALABRIA,FAC ENGN,I-89100 REGGIO CALABRIA,ITALY. LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720. RP PASSALACQUA, E (reprint author), CNR,INST TAE,VIA SALITA S LUCIA CONTESSE 39,I-98126 ST LUCIA,ITALY. OI PASSALACQUA, ENZA/0000-0002-9094-4333 NR 32 TC 76 Z9 76 U1 0 U2 14 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD DEC PY 1992 VL 37 IS 15 BP 2725 EP 2730 DI 10.1016/0013-4686(92)85199-U PG 6 WC Electrochemistry SC Electrochemistry GA JU271 UT WOS:A1992JU27100007 ER PT J AU MELENDRES, CA PANKUCH, M LI, YS KNIGHT, RL AF MELENDRES, CA PANKUCH, M LI, YS KNIGHT, RL TI SURFACE ENHANCED RAMAN SPECTROELECTROCHEMICAL STUDIES OF THE CORROSION FILMS ON IRON AND CHROMIUM IN AQUEOUS-SOLUTION ENVIRONMENTS SO ELECTROCHIMICA ACTA LA English DT Article DE CORROSION FILMS ON IRON AND CHROMIUM; PASSIVE FILMS; SURFACE ENHANCED RAMAN SPECTROSCOPY ID INSITU FTIR SPECTROSCOPY; HYDROXIDE SOLUTION; ALKALINE-SOLUTIONS; DEGREES C; ELECTRODES; ELECTROCHEMISTRY; PASSIVATION; REDUCTION; SPECTRA; LAYER AB "In situ" laser Raman spectra of the corrosion films on iron have been observed in aerated 5 M KOH and 0.15 M NaCl solutions via surface enhancement by the electrodeposition of a silver overlayer. Essentially the same spectra are observed in thr two solutions as a function of applied potential in spite of a breakdown of passivity on iron in the chloride solution. Fe(OH)2 and Fe3O4 are found in the prepassive potential region while FeOOH is present in the passive region. A film which is very difficult to reduce appears to be always present on the electrode surface even at hydrogen evolution potentials; this film is believed to be alpha-FeOOH. Surface enhanced Raman spectra of the corrosion films on chromium have also been obtained in NaCl solution for the first time. The passive film has a composition that corresponds most closely to an amorphous form of Cr2O3, with some Cr(OH), also present. The film is converted in the transpassive region to a higher oxide form, presumably CrO42-. Reversible reduction of this species to Cr2O3 is indicated. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. MEMPHIS STATE UNIV,DEPT CHEM,MEMPHIS,TN 38152. RP MELENDRES, CA (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 31 TC 69 Z9 74 U1 1 U2 31 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD DEC PY 1992 VL 37 IS 15 BP 2747 EP 2754 DI 10.1016/0013-4686(92)85202-V PG 8 WC Electrochemistry SC Electrochemistry GA JU271 UT WOS:A1992JU27100010 ER PT J AU PAYNE, WH AF PAYNE, WH TI DECODE OVERLAPPED EPROM, RAM AND I/O SO ELECTRONICS WORLD & WIRELESS WORLD LA English DT Note RP PAYNE, WH (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU REED BUSINESS PUBLISHING LTD PI SUTTON PA QUADRANT HOUSE THE QUADRANT, SUTTON, SURREY, ENGLAND SM2 5AS SN 0959-8332 J9 ELECTRON WORLD WIREL JI Electron. World Wire. World PD DEC PY 1992 IS 1681 BP 1045 EP 1046 PG 2 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA KA248 UT WOS:A1992KA24800033 ER PT J AU GIOMETTI, CS TAYLOR, J TOLLAKSEN, SL AF GIOMETTI, CS TAYLOR, J TOLLAKSEN, SL TI MOUSE-LIVER PROTEIN DATABASE - A CATALOG OF PROTEINS DETECTED BY 2-DIMENSIONAL GEL-ELECTROPHORESIS SO ELECTROPHORESIS LA English DT Article ID CELL-FRACTIONS; COMPUTER-ANALYSIS; TISSUE PROTEINS; RAT-LIVER; SERUM; CIPROFIBRATE; EXPRESSION; SEQUENCE AB Alterations in the abundance or structure of mouse liver proteins are being studied using two-dimensional gel electrophoresis (2-DE) to build a database of protein changes correlating with exposure to ionizing radiation or toxic chemicals. Thus far, studies have included the analysis of proteins from the offspring of exposed parents or from the exposed individuals themselves. In order to characterize and identify proteins found altered by such exposures, sex- and strain-related differences in protein patterns have been analyzed, and the subcellular locations of a large portion of the mapped proteins have been determined. As part of these studies, data are collected and stored using a variety of computer hardware and software tools that allow the accumulation of information on the origin of samples, gel identification, experiment description, and protein similarities and differences. This accumulation of information constitutes the mouse liver protein database. Relational database software is used to tie the different facets of the database together so that the results of a variety of experiments can be compared and interrelated. The database optimizes the information obtained from 2-DE gel sets by allowing use of the data for many purposes, including monitoring of gel resolution to ensure the collection of high quality data and correlation of protein effects induced by different agents. This first edition of the Argonne National Laboratory mouse liver protein database lays the foundation for future work and communication that should elucidate the significance of observed protein effects as possible markers of exposure to toxic agents. RP GIOMETTI, CS (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,BLDG 202,RM B117,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 26 TC 41 Z9 43 U1 0 U2 0 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0173-0835 J9 ELECTROPHORESIS JI Electrophoresis PD DEC PY 1992 VL 13 IS 12 BP 970 EP 991 DI 10.1002/elps.11501301200 PG 22 WC Biochemical Research Methods; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA KL355 UT WOS:A1992KL35500004 PM 1286668 ER PT J AU FRYDMAN, J NIMMESGERN, E ERDJUMENTBROMAGE, H WALL, JS TEMPST, P HARTL, FU AF FRYDMAN, J NIMMESGERN, E ERDJUMENTBROMAGE, H WALL, JS TEMPST, P HARTL, FU TI FUNCTION IN PROTEIN FOLDING OF TRIC, A CYTOSOLIC RING COMPLEX CONTAINING TCP-1 AND STRUCTURALLY RELATED SUBUNITS SO EMBO JOURNAL LA English DT Article DE FIREFLY LUCIFERASE; PROTEIN FOLDING; T-COMPLEX POLYPEPTIDE; TUBULIN ID RIBULOSEBISPHOSPHATE-CARBOXYLASE; MOLECULAR CHAPERONES; SEQUENCE-ANALYSIS; ESCHERICHIA-COLI; BINDING-PROTEIN; T-HAPLOTYPES; MITOCHONDRIAL; POLYPEPTIDE-1; CLONING; GROE AB T-complex polypeptide 1 (TCP-1) was analyzed as a potential chaperonin (GroEL/Hsp60) equivalent of the eukaryotic cytosol. We found TCP-1 to be part of a hetero-oligomeric 970 kDa complex containing several structurally related subunits of 52-65 kDa. These members of a new protein family are assembled into a TCP-1 ring complex (TRiC) which resembles the GroEL double ring. The main function of TRiC appears to be in chaperoning monomeric protein folding: TRiC binds unfolded polypeptides, thereby preventing their aggregation, and mediates the ATP-dependent renaturation of unfolded firefly luciferase and tubulin. At least in vitro, TRiC appears to function independently of a small co-chaperonin protein such as GroES. Folding of luciferase is mediated by TRiC but not by GroEL/ES. This suggests that the range of substrate proteins interacting productively with TRiC may differ from that of GroEL. We propose that TRiC mediates the folding of cytosolic proteins by a mechanism distinct from that of the chaperonins in specific aspects. C1 SLOAN KETTERING MEM CANC CTR, PROGRAM CELLULAR BIOCHEM & BIOPHYS, NEW YORK, NY 10021 USA. SLOAN KETTERING MEM CANC CTR, ROCKEFELLER RES LABS, PROGRAM MOLEC BIOL, NEW YORK, NY 10021 USA. BROOKHAVEN NATL LAB, DEPT BIOL, UPTON, NY 11973 USA. RP HARTL, FU (reprint author), SLOAN KETTERING MEM CANC CTR, PROGRAM CELLULAR BIOCHEM & BIOPHYS, NEW YORK, NY 10021 USA. NR 75 TC 317 Z9 320 U1 2 U2 5 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0261-4189 EI 1460-2075 J9 EMBO J JI Embo J. PD DEC PY 1992 VL 11 IS 13 BP 4767 EP 4778 PG 12 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA KC837 UT WOS:A1992KC83700011 PM 1361170 ER PT J AU LEVINE, MD SATHAYE, JA CRAIG, PP PECK, SC AF LEVINE, MD SATHAYE, JA CRAIG, PP PECK, SC TI STRATEGIES FOR ADDRESSING CLIMATE CHANGE - POLICY PERSPECTIVES FROM AROUND THE WORLD SO ENERGY LA English DT Article AB The greenhouse effect is intrinsically global. Accordingly, effective responses require global coordination. While limited policies have been adopted, notably for phasing out chlorofluorocarbons, there is no clear consensus as to what to do about other greenhouse gases. In this paper, we survey attitudes and policy responses among the nations of the world. Public opinion surveys are consistent in showing that considerable sensitivity to environmental issues exists virtually everywhere. On the other hand, there is acute awareness that other issues, especially economic development, can conflict with global climate-change mitigation goals. In such a state of uncertainty there is a strong argument to be made for implementing policies which are good ideas independent of greenhouse-gas considerations. There is also good reason to expand research. What is feasible depends strongly on present and changing attitudes of the citizens of the world, and of their governments. It is thus critical to follow closely the evolution of attitudes. The kind of work summarized in this paper needs to be updated on a continuing basis, and the results made available routinely to the global policy community. We conclude our review with several recommendations for research designed specifically to reduce uncertainty about costs and institutional issues relating to responses to global climate change. C1 UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. ELECT POWER RES INST,PALO ALTO,CA 94303. RP LEVINE, MD (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,ENERGY ANAL PROGRAM,BERKELEY,CA 94720, USA. NR 32 TC 1 Z9 1 U1 0 U2 3 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 1121 EP 1136 DI 10.1016/0360-5442(92)90002-H PG 16 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA JW238 UT WOS:A1992JW23800002 ER PT J AU WADDLE, DB PERLACK, RD AF WADDLE, DB PERLACK, RD TI FINANCING AND DISSEMINATING SMALL ENERGY-SYSTEMS IN RURAL-AREAS SO ENERGY LA English DT Article ID DEVELOPING-COUNTRIES; TECHNOLOGIES AB The viability of small energy systems, primarily photovoltaic systems, is discussed as an alternative for rural electrification via traditional grid extension. A dissemination model that incorporates financing to allow access to a much larger population of users and technology support (e.g., training for sales and service and small business development) is described. The experience of two successful programs is presented to illustrate the keys to effective program development and implementation. RP WADDLE, DB (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831, USA. NR 16 TC 4 Z9 4 U1 1 U2 9 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 1255 EP 1262 DI 10.1016/0360-5442(92)90014-Q PG 8 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA JW238 UT WOS:A1992JW23800014 ER PT J AU WESCHLER, CJ HODGSON, AT WOOLEY, JD AF WESCHLER, CJ HODGSON, AT WOOLEY, JD TI INDOOR CHEMISTRY - OZONE, VOLATILE ORGANIC-COMPOUNDS, AND CARPETS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article AB Volatile organic compounds (VOCs) been measured in a freshly carpeted 20-m3 stainless-steel room in both the absence and presence of ozone (ozone concentrations ranging from 30 to 50 ppb, with one experiment conducted at 400 ppb). Four different types of carpeting were exposed, and in each set of experiments, the room was ventilated at 1 air exchange/h. The gas-phase concentrations of selected carpet emissions (e.g., 4-phenylcyclohexene, 4-vinylcyclohexene, and styrene) significantly decreased in the presence of ozone. Conversely, the concentrations of other compounds (e.g., formaldehyde, acetaldehyde, and aldehydes with between 5 and 10 carbons) significantly increased. Furthermore, the total concentration of VOCs increased markedly in the presence of ozone. The additional VOCs appear to have been generated by reactions between ozone and relatively nonvolatile compounds associated with the carpets. These studies suggest that VOCs measured within a building at elevated ozone levels (>30 ppb) may differ from those measured at lower ozone levels (<10 ppb). C1 LAWRENCE BERKELEY LAB,INDOOR ENVIRONM PROGRAM DIV ENERGY & ENVIRONM,BERKELEY,CA 94720. RP WESCHLER, CJ (reprint author), AT&T BELL LABS,COMMUN RES,331 NEWMAN SPRINGS RD,RED BANK,NJ 07701, USA. RI Weschler, Charles/A-9788-2009 OI Weschler, Charles/0000-0002-9097-5850 NR 12 TC 145 Z9 146 U1 2 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD DEC PY 1992 VL 26 IS 12 BP 2371 EP 2377 DI 10.1021/es00036a006 PG 7 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA KA328 UT WOS:A1992KA32800013 ER PT J AU WU, YL DAVIDSON, CI LINDBERG, SE RUSSELL, AG AF WU, YL DAVIDSON, CI LINDBERG, SE RUSSELL, AG TI RESUSPENSION OF PARTICULATE CHEMICAL-SPECIES AT FORESTED SITES SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID PARTICLE RESUSPENSION; DECIDUOUS FOREST; DRY DEPOSITION; INERT SURFACES; ATMOSPHERE; TURBULENCE; NITROGEN; FOLIAGE; CANOPY; SIZES AB The resuspension rates of particulate chemical species have been estimated using aerodynamic surrogate surfaces (symmetrical airfoils) at a mixed deciduous forest site, and also using throughfall sampling at a loblolly pine forest site. The airfoils were placed above, within, and below the crown of the deciduous canopy to determine the vertical variation of deposition and resuspension. The resuspension rates of SO42-, C2O42-, and Ca from the airfoils are estimated to be on the order of 10(-6)-10(-5) s-1. The resuspension rates within the crown are only slightly less than those above the canopy. This is in contrast to the mean wind speed, which is much smaller within the crown than above the canopy. The smaller differences in the resuspension rate compared with differences in mean wind speed may be due to the effects of wind gusts which penetrate deep within the canopy. Based on the throughfall data, the resuspension rates for Ca, Mg, and Na are also in the range 10(-6)-10(-5) s-1. Overall, these results suggest that resuspension may need to be taken into account when particle deposition to vegetation is estimated. C1 CARNEGIE MELLON UNIV,DEPT MECH ENGN,PITTSBURGH,PA 15213. CARNEGIE MELLON UNIV,DEPT CIVIL ENGN,PITTSBURGH,PA 15213. OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. NR 44 TC 7 Z9 8 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD DEC PY 1992 VL 26 IS 12 BP 2428 EP 2435 DI 10.1021/es00036a014 PG 8 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA KA328 UT WOS:A1992KA32800021 ER PT J AU BARNTHOUSE, LW AF BARNTHOUSE, LW TI THE ROLE OF MODELS IN ECOLOGICAL RISK ASSESSMENT - A 1990S PERSPECTIVE SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE RISK ASSESSMENT; ECOLOGICAL MODELS; POPULATIONS; ECOSYSTEMS; LANDSCAPES ID TIME-VARYING CONCENTRATIONS; INDIVIDUAL-BASED MODEL; OF-THE-ART; PHYSIOLOGICAL ECOLOGY; LEPOMIS-MACROCHIRUS; AQUATIC ORGANISMS; SIMULATION-MODEL; SUBLETHAL COPPER; REGIONAL SCALE; LIFE-HISTORY AB Previously published reviews of mathematical models available for ecological risk assessment have emphasized population and ecosystem modeling approaches originally developed 20 years ago or more. Discussions of applications have focused on quantifying ecological effects of toxic chemicals and pesticides. This review emphasizes (a) modeling approaches developed within the last decade; (b) applications to a broad array of environmental problems on local, regional, and global scales; and (c) the relevance of different types of models to different components of the risk assessment process. RP BARNTHOUSE, LW (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37830, USA. NR 81 TC 41 Z9 53 U1 0 U2 2 PU SETAC PRESS PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3370 SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD DEC PY 1992 VL 11 IS 12 BP 1751 EP 1760 DI 10.1897/1552-8618(1992)11[1751:TROMIE]2.0.CO;2 PG 10 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA JW986 UT WOS:A1992JW98600007 ER PT J AU HOTCHKISS, JA KENNEL, SJ HARKEMA, JR AF HOTCHKISS, JA KENNEL, SJ HARKEMA, JR TI A RAT MONOCLONAL-ANTIBODY SPECIFIC FOR MURINE TYPE-1 PNEUMOCYTES SO EXPERIMENTAL AND MOLECULAR PATHOLOGY LA English DT Article ID GREAT ALVEOLAR CELL; II CELLS; LUNG INJURY; MOUSE LUNG; BUTYLATED HYDROXYTOLUENE; ANTIGEN; LOCALIZATION; EXPOSURE; MICE; SURFACTANT C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. RP HOTCHKISS, JA (reprint author), INHALAT TOXICOL RES INST,POB 5890,ALBUQUERQUE,NM 87185, USA. FU NIGMS NIH HHS [GM7438] NR 40 TC 3 Z9 3 U1 1 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0014-4800 J9 EXP MOL PATHOL JI Exp. Mol. Pathol. PD DEC PY 1992 VL 57 IS 3 BP 235 EP 246 DI 10.1016/0014-4800(92)90014-3 PG 12 WC Pathology SC Pathology GA KK499 UT WOS:A1992KK49900007 PM 1283737 ER PT J AU POIRIER, Y DENNIS, D KLOMPARENS, K NAWRATH, C SOMERVILLE, C AF POIRIER, Y DENNIS, D KLOMPARENS, K NAWRATH, C SOMERVILLE, C TI PERSPECTIVES ON THE PRODUCTION OF POLYHYDROXYALKANOATES IN PLANTS SO FEMS MICROBIOLOGY LETTERS LA English DT Article DE POLYHYDROXYALKANOATE; POLYHYDROXYBUTYRATE; PLANTS; ARABIDOPSIS ID POLY-BETA-HYDROXYBUTYRATE; ALCALIGENES-EUTROPHUS H16; BIOSYNTHESIS; METABOLISM AB Poly-beta-hydroxybutyrate (PHB) was recently shown to be produced in genetically engineered plants which expressed the genes from Alcaligenes eutrophus responsible for the formation of PHB from acetoacetyl-CoA. The transgenic plants accumulated PHB as granules which were similar in size and appearance to the bacterial PHB granules. These observations suggest that large scale production of PHB and other polyhydroxy-alkanoates in genetically altered crop plants may be feasible. C1 MICHIGAN STATE UNIV, DEPT BOT & PLANT PATHOL, E LANSING, MI 48824 USA. JAMES MADISON UNIV, DEPT BIOL, HARRISONBURG, VA 22807 USA. RP POIRIER, Y (reprint author), MICHIGAN STATE UNIV, DOE, PLANT RES LAB, E LANSING, MI 48824 USA. RI Somerville, Christopher/A-4048-2009 OI Somerville, Christopher/0000-0003-4647-0094 NR 30 TC 39 Z9 42 U1 0 U2 2 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0378-1097 J9 FEMS MICROBIOL LETT JI FEMS Microbiol. Lett. PD DEC PY 1992 VL 103 IS 2-4 BP 237 EP 246 DI 10.1111/j.1574-6968.1992.tb05843.x PG 10 WC Microbiology SC Microbiology GA KE777 UT WOS:A1992KE77700019 ER PT J AU ALDIS, DF AF ALDIS, DF TI ATTRITION AND ABRASION MODELS FOR OIL-SHALE PROCESS MODELING SO FUEL LA English DT Article; Proceedings Paper CT EASTERN OIL SHALE SYMP CY NOV 13-15, 1991 CL LEXINGTON, KY DE OIL SHALE; MODELS; FLUIDIZED BEDS ID FLUIDIZED-BED; CARBON ATTRITION; COMBUSTION; COAL; CHAR; PARTICLES; KINETICS; BREAKAGE AB As oil shale is processed, fine particles, much smaller than the original shale, are created. This process is called attrition or, more accurately, abrasion. In this paper, models of abrasion are presented for oil shale processed in several unit operations. Two of these unit operations, a fluidized bed and a lift pipe, are used in the Lawrence Livermore National Laboratory hot recycle solid (HRS) process being developed for the above-ground processing of oil shale. Abrasion occurs so commonly in the handling and processing of particulate materials that numerous studies have been conducted to characterize the phenomenon and to attempt to minimize it. In the review of the literature, materials which have been studied for attrition potential are examined, as are the specific unit operations for which either experimental or modelling studies have been conducted. Several papers are discussed in which attrition in fluidized beds or lift pipes is addressed. In this paper, empirical models are derived for the processes occurring in the HRS process from the experimental studies conducted on oil shale. The derived models are presented, as are comparisons with experimental results. RP ALDIS, DF (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-365,LIVERMORE,CA 94550, USA. NR 28 TC 1 Z9 1 U1 1 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD DEC PY 1992 VL 71 IS 12 BP 1447 EP 1453 DI 10.1016/0016-2361(92)90218-D PG 7 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA JY157 UT WOS:A1992JY15700014 ER PT J AU LOVICH, JE GIBBONS, JW AF LOVICH, JE GIBBONS, JW TI A REVIEW OF TECHNIQUES FOR QUANTIFYING SEXUAL SIZE DIMORPHISM SO GROWTH DEVELOPMENT AND AGING LA English DT Article DE SEXUAL SIZE DIMORPHISM; SIZE DIMORPHISM INDEX ID BODY SIZE; GEOGRAPHIC-VARIATION; ECOLOGICAL CAUSES; FOOD-HABITS; SELECTION; EVOLUTION; FEMALES; PRIMATES; MAMMALS; WEIGHT AB Previous studies of sexual size dimorphism (SSD) use a variety of size dimorphism indices (SDI's) to quantify SSD. We propose that a useful SDI should meet four criteria as follows; 1) it should be properly scaled, 2) it should have high intuitive value, 3) it should produce values with one sign, (positive) when sex A is larger than sex B, and the opposite sign when sex B is larger, and 4) it should produce values that are symmetric around a central value, preferably zero. Many previously published SDI's do not meet any of these criteria, and none meet more than three. We present an alternative SDI based on the mean size of the larger sex divided by the mean size of the smaller sex with the result arbitrarily defined as positive (minus one) when females are larger and negative (plus one) in the converse case. Careful selection of a primary size variable is crucial to meaningful interpretation of sexual size differences. C1 SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802. OI Lovich, Jeffrey/0000-0002-7789-2831 NR 70 TC 306 Z9 318 U1 10 U2 62 PU GROWTH PUBL CO INC PI BAR HARBOR PA PO BOX 42, BAR HARBOR, ME 04609-0042 SN 0017-4793 J9 GROWTH DEVELOP AGING JI Growth Dev. Aging PD WIN PY 1992 VL 56 IS 4 BP 269 EP 281 PG 13 WC Developmental Biology; Geriatrics & Gerontology SC Developmental Biology; Geriatrics & Gerontology GA KG915 UT WOS:A1992KG91500008 PM 1487365 ER PT J AU SANDERS, CL AF SANDERS, CL TI PLEURAL MESOTHELIOMA IN THE RAT FOLLOWING EXPOSURE TO (PUO2)-PU-239 SO HEALTH PHYSICS LA English DT Note DE (PUO2)-PU-239; LUNGS, RODENT; INHALATION; TUMOR ID INHALATION CARCINOGENESIS; AGGREGATION AB Pleural mesothelioma was an infrequent observation following deposition of (PuO2)-Pu-239 in the lung or pleural cavity. Only five tumors were found in 2,105 rats exposed to (PuO2)-Pu-239 aerosols in the present study, while four tumors were found in 527 rats that inhaled (PuO2)-Pu-239 in previously published lifespan studies. Risk of pleural mesothelioma was not significantly increased by intrapleural injection of 30 kBq (PuO2)-Pu-239 In contrast, a much higher incidence of peritoneal mesothelioma was seen following intraperitoneal injection of (PuO2)-Pu-239 due to aggregation of (PuO2)-Pu-239 particles on mesothelial surfaces. It was concluded that the lack of (PuO2)-Pu-239 aggregation on pleural surfaces is responsible for small numbers of pleural mesothelioma observed following deposition of (PuO2)-Pu-239. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP SANDERS, CL (reprint author), WASHINGTON STATE UNIV, RICHLAND, WA 99352 USA. NR 11 TC 6 Z9 7 U1 1 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD DEC PY 1992 VL 63 IS 6 BP 695 EP 697 DI 10.1097/00004032-199212000-00012 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 JY751 UT WOS:A1992JY75100012 PM 1428892 ER PT J AU KNITTLE, CD MAGOTRA, N AF KNITTLE, CD MAGOTRA, N TI IMAGE-ENHANCEMENT USING THE ADAPTIVE CORRELATION ENHANCER SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING LA English DT Note AB Results from using a novel two-dimensional adaptive filtering algorithm to enhance two-dimensional (2-D) signals of small spatial extent in noisy images are presented. The algorithm is called the two-dimensional adaptive correlation enhancer (2DACE). The 2DACE algorithm is a coefficient update scheme that converges to the two-dimensional autocorrelation function of the signal or feature of interest. Results are compared to images processed using the 2-D LMS algorithm. C1 UNIV NEW MEXICO,SCH MED,DEPT ELECT ENGN,ALBUQUERQUE,NM 87131. RP KNITTLE, CD (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 7 TC 3 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1057-7130 J9 IEEE T CIRCUITS-II JI IEEE Trans. Circuits Syst. II-Analog Digit. Signal Process. PD DEC PY 1992 VL 39 IS 12 BP 862 EP 865 DI 10.1109/82.208578 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA KX002 UT WOS:A1992KX00200002 ER PT J AU SOLOMON, OM AF SOLOMON, OM TI THE EFFECTS OF WINDOWING AND QUANTIZATION-ERROR ON THE AMPLITUDE OF FREQUENCY-DOMAIN FUNCTIONS SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article; Proceedings Paper CT 9TH ANNUAL INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONF ( IMTC / 92 ) CY MAY 12-14, 1992 CL MEADOWLANDS, NJ SP IEEE AB The discrete Fourier transform and power spectral density (PSD) are often used in analyzing data from analog-to-digital converters. These analyses normally apply a window to the data to alleviate the effects of leakage. This paper describes how windows modify the magnitude of a discrete Fourier transform and the level of a power spectral density computed by Welch's method. For white noise, the magnitude of the discrete Fourier transform at a fixed frequency has a Rayleigh probability distribution. For sine waves with an integer number of cycles and quantization noise, the theoretical values of the amplitude of the discrete Fourier transform and power spectral density are calculated. We show how the signal-to-noise ratio in a single discrete Fourier transform or power spectral density frequency bin is related to the normal time-domain definition of the signal-to-noise ratio. The answer depends on the discrete Fourier transform length, the window type, and the function averaged. RP SOLOMON, OM (reprint author), SANDIA NATL LABS,PRIMARY STAND LAB,ALBUQUERQUE,NM 87185, USA. NR 13 TC 29 Z9 29 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD DEC PY 1992 VL 41 IS 6 BP 932 EP 937 DI 10.1109/19.199437 PG 6 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA KQ207 UT WOS:A1992KQ20700036 ER PT J AU ERICSON, MN FALTER, KG ROCHELLE, JM AF ERICSON, MN FALTER, KG ROCHELLE, JM TI A WIDE-RANGE LOGARITHMIC ELECTROMETER WITH IMPROVED ACCURACY AND TEMPERATURE STABILITY SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article; Proceedings Paper CT 9TH ANNUAL INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONF ( IMTC / 92 ) CY MAY 12-14, 1992 CL MEADOWLANDS, NJ SP IEEE AB A seven-decade temperature-compensated logarithmic electrometer is presented. The amplifier is designed for a dynamic range of 1 pA to 10 muA. Temperature compensation is accurately achieved by using an array of four matched monolithic bipolar transistors and straightforward postprocessing techniques. Use of this method results in < 1 % error over the temperature range of - 18 to 71-degrees-C for the upper five decades of current. In addition, errors resulting from variable forward current emission coefficients of the logarithmic elements are eliminated. Problems associated with the temperature compensation of logarithmic amplifiers are identified and discussed. Implementation of the new temperature-compensation technique is fully described and compared with conventional methods. Experimental results and data analysis illustrating the performance of the design are presented. C1 UNIV TENNESSEE,DEPT ELECT & COMP ENGN,KNOXVILLE,TN 37996. RP ERICSON, MN (reprint author), OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,MONOLITH SYST DEV GRP,OAK RIDGE,TN 37830, USA. NR 11 TC 9 Z9 10 U1 1 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD DEC PY 1992 VL 41 IS 6 BP 968 EP 973 DI 10.1109/19.199444 PG 6 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA KQ207 UT WOS:A1992KQ20700043 ER PT J AU BRAUDAWAY, DW AF BRAUDAWAY, DW TI A NEW STATE-OF-THE-ART STANDARDS FACILITY SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article; Proceedings Paper CT 9TH ANNUAL INSTRUMENTATION AND MEASUREMENT TECHNOLOGY CONF ( IMTC / 92 ) CY MAY 12-14, 1992 CL MEADOWLANDS, NJ SP IEEE AB A new facility is being constructed for the Primary Standards Laboratory (PSL) at Sandia National Laboratories in Albuquerque, New Mexico. Features of the final design are at the state of the art and were developed over a number of years of study and design effort. Based on experience and evaluation of anticipated needs, a philosophy was established for the design and followed through the effort. Temperature control of +/-0.01-degrees-C is required for some of the dimensional measuring spaces; isolation from vibration and electromagnetic interference (EMI) is required for all measurement spaces. The requirements for the facility and the principal design features are presented. RP BRAUDAWAY, DW (reprint author), SANDIA NATL LABS,DIV MEASUREMENTS STAND 4343,ALBUQUERQUE,NM 87185, USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD DEC PY 1992 VL 41 IS 6 BP 1020 EP 1022 DI 10.1109/19.199385 PG 3 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA KQ207 UT WOS:A1992KQ20700053 ER PT J AU WROBEL, TF BEUTLER, DE AF WROBEL, TF BEUTLER, DE TI SOLUTIONS TO HEAVY-ION INDUCED AVALANCHE BURNOUT IN POWER 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 AB A review of normal breakdown and current induced avalanche breakdown mechanisms in silicon power transistors is presented. We show the applicability of the current induced avalanche model to heavy ion induced burnout and present solutions to current induced avalanche in silicon power semiconductors. RP WROBEL, TF (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 9 TC 24 Z9 24 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 1636 EP 1641 DI 10.1109/23.211346 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500009 ER PT J AU TSVEYBAK, I BUGG, W HARVEY, JA WALTER, J AF TSVEYBAK, I BUGG, W HARVEY, JA WALTER, J TI FAST NEUTRON-INDUCED CHANGES IN NET IMPURITY CONCENTRATION OF HIGH-RESISTIVITY SILICON 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-DAMAGE; IRRADIATED SILICON; DETECTORS AB Resistivity changes produced by 1 Mev neutron irradiation at room temperature have been measured in float-zone grown n and p-type silicon with initial resistivities ranging from 1.8 to 100 kOMEGAcm. Observed changes are discussed in terms of net electrically active impurity concentration. A model is presented which postulates escape of Si self-interstitials and vacancies from damage clusters and their subsequent interaction with impurities and other preexisting defects in the lattice. These interactions lead to transfer of B and P from electrically active substitutional configurations into electrically inactive positions (B(i) , P(i), and E-center), resulting in changes of net electrically active impurity concentration. The changes in spatial distribution of resistivity are discussed, and the experimental data are fit by theoretical curves. Differences in the behavior of n-type and p-type material are explained on the basis of a faster removal of substitutional P and a more nonuniform spatial distribution of the original P concentration. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. INTRASPEC INC,OAK RIDGE,TN. RP TSVEYBAK, I (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 32 TC 17 Z9 17 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1720 EP 1729 DI 10.1109/23.211359 PN 1 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500022 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 SEXTON, FW FLEETWOOD, DM ALDRIDGE, CC GARRETT, G PELLETIER, JC GAONA, JI AF SEXTON, FW FLEETWOOD, DM ALDRIDGE, CC GARRETT, G PELLETIER, JC GAONA, JI TI QUALIFYING COMMERCIAL ICS FOR SPACE TOTAL-DOSE 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 IRRADIATIONS; BUILDUP; DEVICES AB A test protocol based on MIL-STD-883D, Test Method 1019.4, which includes a room-temperature biased anneal following irradiation, is shown to predict device response to low dose-rate irradiations more accurately than the present standard. In this work we measure failure dose with three different test protocols: 1) with method 1019.4, 2) with Method 1019.4 plus a room-temperature anneal, and 3) with 0.2 rad(Si)/s irradiations at static and dynamic bias. In comparing the power-supply current (I(DD)) of two commercial field-programmable gate arrays (FPGAs), we found that the failure dose for devices with a high annealing rate increased by a factor of 10 times when a room-temperature anneal is included, while devices with a slower annealing rate showed almost a 2-times improvement in failure dose. Slower-annealing devices showed a higher failure dose when dynamically biased during low dose-rate irradiations, indicating that radiation-induced charge neutralization accelerated recovery in these devices. Recommendations are provided on methods to characterize the hardness of MOS ICs using a test flow that includes room-temperature in addition to elevated temperature anneals. RP SEXTON, FW (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 27 Z9 27 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 1869 EP 1875 DI 10.1109/23.211380 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500043 ER PT J AU KESHAVARZ, AA FISCHER, TA AF KESHAVARZ, AA FISCHER, TA TI IMPROVING THE RADIATION BURN-OUT SUSCEPTIBILITY OF N-CHANNEL POWER MOSFETS 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 Computer simulation was used to calculate the dose-rate thresholds of several different power MOSFET structures. Computational results indicate that significant improvements in radiation tolerance and burnout of the device are possible by reducing the lateral size of the power MOSFET unit cell, or by using a lower emitter injection efficiency for the bipolar structure. Modification of some other factors, such as the base minority carrier lifetime or the epi/substrate interface shape, shows some minor improvements in device radiation tolerance. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP KESHAVARZ, AA (reprint author), ALLIANCE TECHNOL INC,10510 RES RD SE,ALBUQUERQUE,NM 87123, USA. NR 6 TC 12 Z9 13 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1943 EP 1946 DI 10.1109/23.211389 PN 1 PG 4 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500052 ER PT J AU SCHWANK, JR FLEETWOOD, DM SHANEYFELT, MR WINOKUR, PS AXNESS, CL RIEWE, LC AF SCHWANK, JR FLEETWOOD, DM SHANEYFELT, MR WINOKUR, PS AXNESS, CL RIEWE, LC TI LATENT INTERFACE-TRAP BUILDUP AND ITS IMPLICATIONS FOR HARDNESS ASSURANCE 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 GATE MOS DEVICES; TRANSISTORS; CHARGE; DEPENDENCE; SILICON; IRRADIATION; POLYSILICON; TEMPERATURE; CAPACITORS; HYDROGEN AB Long term anneals at temperatures from 25-degrees-C to 135-degrees-C have been performed on irradiated MOS transistors. Following the ''normal'' saturation of interface-trap density (within 10(2) to 10(5) s after irradiation), large increases in the number of interface traps have been observed for both commercial and radiation-hardened transistors at very long times after irradiation (>10(6) s at 25-degrees-C). This ''latent'' buildup of interface traps can be significant, up to a factor of four times larger than the normal saturation value. The latent buildup is thermally activated with an activation energy of 0.47 +/- 0.08 eV. As a natural consequence of the delay between the normal and the latent buildup, there is a ''window'' in time in which little or no interface-trap buildup occurs. Two possible mechanisms for the latent buildup are explored: 1) the direct conversion of oxide traps into interface traps or ''border traps'' and 2) the diffusion of molecular hydrogen into the gate oxide from adjacent structures. The latent buildup of interface traps can degrade the performance of ICs in space systems and may cause IC failure at long times. Interface-trap windows can present problems in measuring and predicting the number of interface traps at very late times using a typical rebound test, e.g., that of MIL-STD-883D, Test Method 1019.4. Recommendations are provided for characterizing latent interface-trap buildup. RP SCHWANK, JR (reprint author), SANDIA NATL LABS,DEPT 1332,ALBUQUERQUE,NM 87185, USA. NR 32 TC 62 Z9 64 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 1953 EP 1963 DI 10.1109/23.211391 PN 1 PG 11 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500054 ER PT J AU SANFORD, TWL MOCK, RC AF SANFORD, TWL MOCK, RC TI AN INTENSE LARGE-VOLUME UNIFORM SOURCE OF BREMSSTRAHLUNG FOR PULSED GAMMA-RAY SIMULATION 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 DIODE; DYNAMICS AB The intense radiation fields generated with useful uniformity over large volumes, using the novel compound-lens diode on Hermes III, are characterized. The measurements show that by changing the diode parameters, the peak dose, useful area, and useful volume of irradiation can be varied from approximately 100 krad(Si), approximately 600 cm2, and approximately 20x10(3) cm3 to 20 krad(Si), approximately 3400 cm2, and approximately 200x10(3) cm3, in a 19+/-2 ns radiation pulse. This versatility enables radiation fields to be tailored to a specified exposure requirement, significantly enhancing the capability of Hermes III to test radiation effects in systems. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 14 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 2060 EP 2069 DI 10.1109/23.211404 PN 1 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500067 ER PT J AU GRIFFIN, PJ KELLY, JG LUERA, TF VANDENBURG, J AF GRIFFIN, PJ KELLY, JG LUERA, TF VANDENBURG, J TI EFFECT OF NEW CROSS-SECTION EVALUATIONS ON NEUTRON-SPECTRUM DETERMINATION 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 Several new neutron cross section libraries, such as ENDF/B-VI and IRDF-90, have recently been made available to the dosimetry community. Recommendations are made for the source selection of reaction cross sections that vary significantly among the libraries. In general, integral parameters from spectra obtained from unfold/adjustment codes using the new cross sections will not significantly change. A 61-reaction compendium of dosimetry cross sections drawn from existing evaluations has been compiled for use at the Sandia National Laboratories Radiation Metrology Laboratory. This dosimetry library (SNLRML) is recommended for use in spectrum determination with unfold/adjustment methods. C1 SCI & ENGN ASSOCIATES INC,ALBUQUERQUE,NM 87190. RP GRIFFIN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 26 TC 4 Z9 5 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 2078 EP 2085 DI 10.1109/23.211406 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500069 ER PT J AU WUNSCH, TF AXNESS, CL AF WUNSCH, TF AXNESS, CL TI MODELING THE TIME-DEPENDENT TRANSIENT RADIATION RESPONSE OF SEMICONDUCTOR JUNCTIONS 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 Analytic one dimensional time-dependent photocurrent models are developed from new solutions to the ambipolar transport equation. The p-n junction model incorporates the effects of an electric field in the quasi-neutral region, finite diode length, and an arbitrary generation function g=f(x,t). It provides improved accuracy over the Wirth-Rogers and Enlow-Alexander models. An approximate photocurrent solution for p-n-n+, n-p-p+, and p-i-n diode junctions is developed considering high-injection effects. Comparison with experimental data shows that a single set of physical parameters is adequate to characterize the model with respect to dose-rate, pulse-width, and geometry. RP WUNSCH, TF (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 4 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 2158 EP 2169 DI 10.1109/23.211417 PN 1 PG 12 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500080 ER PT J AU FLEETWOOD, DM MILLER, SL REBER, RA MCWHORTER, PJ WINOKUR, PS SHANEYFELT, MR SCHWANK, JR AF FLEETWOOD, DM MILLER, SL REBER, RA MCWHORTER, PJ WINOKUR, PS SHANEYFELT, MR SCHWANK, JR TI NEW INSIGHTS INTO RADIATION-INDUCED OXIDE-TRAP CHARGE THROUGH THERMALLY-STIMULATED-CURRENT MEASUREMENT AND ANALYSIS 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 NONVOLATILE MEMORY TRANSISTORS; MOS DEVICES; SPACE ENVIRONMENTS; HOLE TRAPS; X-RAY; INTERFACE; CMOS; GATE; CAPACITORS; DEPENDENCE AB An analytic model with no free parameters has been developed which accurately describes thermally-stimulated-current (TSC) measurements spanning more than a factor of 50 in average heating rate. The model incorporates Schottky electric-field-induced barrier lowering and a temperature-dependent ''attempt-to-escape frequency'' equal to approximately 10(14) Hz at 300-degrees-C. Applying this model to TSC measurements provides significantly improved estimates of the energy distribution of trapped holes in irradiated SiO2. All devices examined, including soft and (wet and dry) hard oxides from five process technologies, show similar energy distributions, with a minor peak at approximately 1.2 eV and a broad major peak centered approximately 1.7-2.0 eV above the SiO2 valence band. These energies are closer to photoinjection and tunneling estimates of trapped-hole energy in the literature than previous estimates based on TSC or thermal annealing. We also find that the trapped-electron density in irradiated SiO2 is proportional to the trapped-hole density over a wide range of irradiation conditions. Both the trapped-hole and trapped-electron densities scale with the applied oxide electric field (E(ox)) during irradiation as approximately (E(ox))-1/2. These results strongly support the idea that electrons are trapped at sites associated with trapped holes. Wet gate oxides are found to trap significantly fewer electrons per trapped hole (approximately 16%) than dry oxides (approximately 48%), suggesting that, on average, holes may be trapped closer to the Si/SiO2 interface in the dry oxides than in the wet oxides. Possible models of the trapped-hole/trapped-electron complex are described, and implications for device long-term reliability and annealing response are discussed. RP FLEETWOOD, DM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 60 TC 107 Z9 109 U1 1 U2 9 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 2192 EP 2203 DI 10.1109/23.211421 PN 1 PG 12 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500084 ER PT J AU SHANEYFELT, MR SCHWANK, JR FLEETWOOD, DM WINOKUR, PS HUGHES, KL HASH, GL CONNORS, MP AF SHANEYFELT, MR SCHWANK, JR FLEETWOOD, DM WINOKUR, PS HUGHES, KL HASH, GL CONNORS, MP TI INTERFACE-TRAP BUILDUP RATES IN WET AND DRY 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 SEMICONDUCTOR DEVICES; CO-60 IRRADIATIONS; SPACE ENVIRONMENTS; TIME-DEPENDENCE; MOS-TRANSISTORS; HOLE TRANSPORT; X-RAY; RADIATION; CHARGE; STATES AB The time dependent buildup of radiation-induced interface-trap charge was characterized in polysilicon gate MOS transistors with wet and dry gate oxides with thicknesses varying from approximately 20 to approximately 100 nm. The buildup was characterized in terms of the time required to achieve 50% of the saturated density of interface traps. For both types of oxides, an approximate t(ox)0.4 dependence of the interface-trap buildup rate is observed following +1 MV/cm irradiation and anneal, and an approximate t(ox)1.7 dependence is observed following -1 MV/cm irradiation and +1 MV/cm anneal. The fact that these thickness dependence differ from recent literature reports suggests that the manner in which hydrogen is incorporated in the oxide during processing may play a key role in determining whether H+ is released in the bulk of the oxide, or near an interface. At any given oxide thickness and irradiation condition, the buildup rate was found to be faster in the dry gate oxides than the wet gate oxides. It is suggested that the difference in buildup rates between the wet and dry oxides could be due to differences in the mobility of H+ in wet versus dry gate oxides, or to different spatial hole-trap distributions in the wet versus dry gate oxides. RP SHANEYFELT, MR (reprint author), SANDIA NATL LABS,DIV 1332,ALBUQUERQUE,NM 87185, USA. NR 29 TC 26 Z9 27 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 2244 EP 2251 DI 10.1109/23.211427 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM885 UT WOS:A1992KM88500090 ER PT J AU SHAEFFER, DL KIMBROUGH, JR WILBURN, JW DENTON, SM KASCHMITTER, JL COLELLA, NJ COAKLEY, PG CASTENEDA, C AF SHAEFFER, DL KIMBROUGH, JR WILBURN, JW DENTON, SM KASCHMITTER, JL COLELLA, NJ COAKLEY, PG CASTENEDA, C TI PROTON-INDUCED SEU, DOSE EFFECTS, AND LEO PERFORMANCE PREDICTIONS FOR R3000 MICROPROCESSORS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID UPSET AB This paper presents low energy (less-than-or-equal-to 60 MeV) proton exposure test results for commercial unhardened versions of the MIPS Computer Systems R3000 and R3000A microprocessors from four different vendors, and compares these results with previously obtained data at 256 MeV. Proton SEU cross sections and total dose hardness values are presented. Two of the processors functioned to about 1 Mrad. All processors, with one exception, remained functional above 40 krad. SEU cross sections were obtained with the use of specially designed software tests which were executed dynamically during radiation exposure of the chips. Radiation hardness and SEU are investigated for LEO. Results indicate that commercial R3000 and R3000A microprocessors are suitable for multi-year operation at LEO altitudes in space. C1 JAYCOR,SAN DIEGO,CA 92121. UNIV CALIF DAVIS,CROCKER NUCL LAB,DAVIS,CA 95616. RP SHAEFFER, DL (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 25 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1992 VL 39 IS 6 BP 2309 EP 2315 DI 10.1109/23.211441 PN 2 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA KM886 UT WOS:A1992KM88600006 ER PT J AU PERATT, AL FALTHAMMAR, CG RYNN, N AF PERATT, AL FALTHAMMAR, CG RYNN, N TI PLASMA-EXPERIMENTS IN THE LABORATORY AND IN SPACE SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Editorial Material C1 ROYAL INST TECHNOL,DEPT PLASMA PHYS,S-10044 STOCKHOLM 70,SWEDEN. UNIV CALIF IRVINE,DEPT PHYS,IRVINE,CA 92717. RP PERATT, AL (reprint author), LOS ALAMOS NATL LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1992 VL 20 IS 6 BP 573 EP 576 PG 4 WC Physics, Fluids & Plasmas SC Physics GA KN760 UT WOS:A1992KN76000001 ER PT J AU BOROVSKY, JE AF BOROVSKY, JE TI PHYSICS ISSUES ASSOCIATED WITH LOW-BETA PLASMA GENERATORS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID COMPUTER-SIMULATIONS; MAGNETIZED VACUUM; BOUNDARY-LAYER; ION CLOUDS; MAGNETOSPHERE; FIELD; IONOSPHERE; ELECTRONS; PROPAGATION; INSTABILITY AB Kinetic aspects of MHD generators are explored by examining the propagation of dense, low-beta streams of plasma. Three situations are considered: the basic principles of plasma-stream propagation, the propagation of plasma streams into vacuum, and the propagation of plasma streams into ambient plasmas. These three situations are analogous to plasma generators, plasma generators with vacuum loads, and plasma generators with plasma loads. Kinetic (microphysics) aspects include oscillations of the generator plasma, the effects of diocotron instabilities, the accereration of particles, the starvation of current systems, and plasma-wave production. RP BOROVSKY, JE (reprint author), LOS ALAMOS NATL LAB,SPACE PLASMA PHYS GRP,LOS ALAMOS,NM 87545, USA. NR 35 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1992 VL 20 IS 6 BP 644 EP 650 DI 10.1109/27.199506 PG 7 WC Physics, Fluids & Plasmas SC Physics GA KN760 UT WOS:A1992KN76000011 ER PT J AU MEIEROVICH, BE PERATT, AL AF MEIEROVICH, BE PERATT, AL TI EQUILIBRIUM OF INTERGALACTIC CURRENTS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID STABILITY AB The plasma universe approach to the structure of the universe considers space to be filled with a network of currents which can undergo pinch compression. The equilibrium structures of such currents are treated in the same way as the structure in laboratory pinches. The difference, for the galactic case, is that gravitational interaction forces between the particles must be included in the analysis. This paper illustrates a simple and straightforward way of achieving this. C1 LOS ALAMOS NATL LAB,DEPT PHYS,LOS ALAMOS,NM 87545. RP MEIEROVICH, BE (reprint author), RUSSIAN ACAD SCI,INST PHYS PROBLEMS,MOSCOW 117334,RUSSIA. NR 9 TC 1 Z9 1 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 891 EP 892 DI 10.1109/27.199545 PG 2 WC Physics, Fluids & Plasmas SC Physics GA KN760 UT WOS:A1992KN76000043 ER PT J AU GISLER, G AF GISLER, G TI SIMULATIONS OF 2ND-ORDER FERMI ACCELERATION OF ELECTRONS - SOLVING THE INJECTION PROBLEM SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB The boosting of electrons from a Maxwellian distribution into a suprathermal power-law tail has long been recognized as an important bottleneck governing the subsequent acceleration of some of these electrons to relativistic energies. This is the seed or injection problem. I study this boosting process using a test-particle simulation code, following the full equations of motion of tens of thousands of electrons chosen from a thermal population as they move through general time-dependent magnetic fields. In the model, finite swarms of moving current loops produce inhomogeneities in the magnetic field. A swarm is characterized by a Maxwellian velocity distribution and a flat random distribution of loop size and dipole moment strength. I distinguish between bulk heating of the electron population or boosting of selected electrons. Which of these occurs is found to depend on the size of the swarm thermal speed compared with the electron thermal speed. When the swarm thermal speed is comparable to the electron thermal speed, the entire electron population is heated by encounters with the rapidly moving current loops, approximately preserving the Maxwellian character of the electron distribution. On the other hand, at very low swarm thermal speeds there is no bulk heating; instead one percent or fewer of the electrons are boosted into a power-law suprathermal tail with a differential energy spectral index between -1 and -2. Individual boosts of 2000 and more have been observed in samples of 50000 electrons. Most of the strongly boosted electrons have initial energies that are well below the peak of the initial Maxwellian, suggesting that the boosting mainly occurs in multimirror traps. RP GISLER, G (reprint author), LOS ALAMOS NATL LAB,DIV SPACE PLASMA PHYS,LOS ALAMOS,NM 87545, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1992 VL 20 IS 6 BP 917 EP 921 DI 10.1109/27.199550 PG 5 WC Physics, Fluids & Plasmas SC Physics GA KN760 UT WOS:A1992KN76000048 ER PT J AU GISLER, G AHMAD, QR WOLLMAN, ER AF GISLER, G AHMAD, QR WOLLMAN, ER TI 2-STREAM AND GRAVITATIONAL INSTABILITIES IN A GRAIN PLASMA SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID SYSTEM AB If the massive component of a two-component plasma consists of weakly charged solid grains, electrostatic and gravitational instabilities can operate on similar spatial and temporal scales. In particular, when the grain charge-to-mass ratio is of the order of the square root of the gravitational constant, the electrostatic two-stream (or Buneman) instability can seed the Jeans gravitational instability, selecting a scale for the resulting condensation. Using particle-in-cell simulations, we verify the behavior of each of these instabilities acting alone in the appropriate limits, and show that when both act in concert a grand equipartition among all available stores of energy is achieved. C1 BATES COLL,DEPT PHYS & ASTRON,LEWISTON,ME 04240. RP GISLER, G (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 16 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1992 VL 20 IS 6 BP 922 EP 928 DI 10.1109/27.199551 PG 7 WC Physics, Fluids & Plasmas SC Physics GA KN760 UT WOS:A1992KN76000049 ER PT J AU PHAM, H AF PHAM, H TI ON THE OPTIMAL-DESIGN OF K-OUT-OF-N-G SUBSYSTEMS SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Article DE K-OUT-OF-N SYSTEM; MAJORITY SYSTEM; REDUNDANCY; OPTIMIZATION; MINIMIZING COST ID SYSTEMS AB For a k-out-of-n:G subsystem, we are interested in mathematically determining the most economical number of components in the subsystem. This paper gives the optimal values of k (for fixed n) and n (for fixed k), which minimize the mean total cost of k-out-of-n:G subsystems. A numerical example illustrates the results. RP PHAM, H (reprint author), EG&G IDAHO INC,NATL ENGN LAB,MS 2406,POB 1625,IDAHO FALLS,ID 83415, USA. NR 8 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 0018-9529 J9 IEEE T RELIAB JI IEEE Trans. Reliab. PD DEC PY 1992 VL 41 IS 4 BP 572 EP 575 DI 10.1109/24.249588 PG 4 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KJ438 UT WOS:A1992KJ43800019 ER PT J AU PHAM, H AF PHAM, H TI OPTIMAL-DESIGN OF PARALLEL-SERIES SYSTEMS WITH COMPETING FAILURE MODES SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Article DE MEAN SYSTEM PROFIT; COST OPTIMIZATION; COMPETING FAILURE MODE; SHORT MODE; OPEN MODE AB The problem is to achieve optimal subsystem size for parallel-series systems, assuming that components and systems are subject to two types of failure modes: open & short. Components are statistically independent and identically distributed; the costs of the two modes of system failures need not be the same. The objectives of this paper are to optimize the number of subsystems (m), for a given number of components in each subsystem (n), such that: the mean system profit is maximized showing how m depends on system parameters and showing that there does not exist a pair (m,n) maximizing the mean system-profit minimizes the mean system cost. The results are illustrated with several numerical examples. RP PHAM, H (reprint author), IDAHO NATL ENGN LAB,MS 2406,POB 1625,IDAHO FALLS,ID 83415, USA. NR 5 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 583 EP 587 DI 10.1109/24.249590 PG 5 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KJ438 UT WOS:A1992KJ43800023 ER PT J AU BROEKHUIS, RR KOCH, DJ LYNN, S AF BROEKHUIS, RR KOCH, DJ LYNN, S TI A MEDIUM-TEMPERATURE PROCESS FOR REMOVAL OF HYDROGEN-SULFIDE FROM SOUR GAS STREAMS WITH AQUEOUS METAL SULFATE-SOLUTIONS SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID CONCENTRATE; PRESSURE; ACID AB A process is proposed for removing hydrogen sulfide from coal gas at its adiabatic saturation temperature. The coal gas would be contacted with a metal sulfate solution in a Venturi scrubber, leading to the formation of a solid metal sulfide. This metal sulfide would be oxidized with ferric ion, forming sulfur and regenerating the metal sulfate solution. Ferrous ion would be reoxidized with air. Experimental work was done on the absorption of hydrogen sulfide into zinc and copper sulfate solutions. The rate of absorption into zinc sulfate is a strong function of pH and is unsatisfactory at the pH proposed for this process. The rate of absorption into copper sulfate solutions is high over a large range of pH and may be modeled as an instantaneous reaction with liquid- or gas-phase mass transfer controlling. Calculations indicate that a Venturi scrubber can reduce hydrogen sulfide to a concentration below 10 ppm using a copper sulfate solution. The oxidation of zinc and copper sulfide with ferric ion at temperatures 80-150-degrees-C yielded conversions as high as 99%; however, complete conversion of either sulfide to elemental sulfur was not achieved. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP BROEKHUIS, RR (reprint author), UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720, USA. NR 13 TC 7 Z9 7 U1 2 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD DEC PY 1992 VL 31 IS 12 BP 2635 EP 2642 DI 10.1021/ie00012a002 PG 8 WC Engineering, Chemical SC Engineering GA KC092 UT WOS:A1992KC09200002 ER PT J AU SCOTT, TC AF SCOTT, TC TI EFFECTS OF LOW-AMPLITUDE FORCED OSCILLATION ON THE RATE OF MASS-TRANSFER TO CIRCULATING LIQUID DROPLETS SO INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH LA English DT Article ID ELECTRIC-FIELD; HEAT-TRANSFER; DROPS AB Aqueous droplets suspended in upflowing 2-ethyl-1-hexanol have been forced to undergo low-amplitude shape oscillations by imposition of a pulsed dc electric field. The effects of the imposed oscillation on mass transfer from the continuous phase have been experimentally investigated by measuring the rate of accumulation of a fluorescent dye in droplets. The rates of transport to droplets in each of three oscillation conditions (0%, 5% and 10% amplitude) were observed at four continuous-phase concentrations in the range of 50-500 ppb of the fluorescent dye. The effects appear to be more pronounced at the lower concentrations, with the 10% and 5% oscillations producing 44% and 9.5% increases in mass flux, respectively, at a continuous-phase concentration of 50 ppb. All three curves are virtually parallel until the upper limit of the concentration range is approached, at which point the oscillating drop rates appear to be upwardly diverging from the base-case data. RP SCOTT, TC (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,POB 2008,OAK RIDGE,TN 37831, USA. NR 32 TC 3 Z9 3 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0888-5885 J9 IND ENG CHEM RES JI Ind. Eng. Chem. Res. PD DEC PY 1992 VL 31 IS 12 BP 2731 EP 2740 DI 10.1021/ie00012a016 PG 10 WC Engineering, Chemical SC Engineering GA KC092 UT WOS:A1992KC09200016 ER PT J AU TORMA, AE AF TORMA, AE TI BIOENHANCED GOLD EXTRACTION FROM REFRACTORY ORES SO INTERDISCIPLINARY SCIENCE REVIEWS LA English DT Article ID SULFIDE ORES AB The continuing depiction of high grade oxide gold deposits has created a need for new, economically viable and environmentally safe methods to treat refractory sulphidic ores. One of the alternative leaching processes uses micro-organisms, Thiobacillus ferro-oxidans, partially to oxidise pyrite and/or arsenopyrite containing finely disseminated, submicrometre sized native gold particles. During the bioleaching process, the solid sulphide matrix is converted to sulphate, which is soluble in the leach medium. After solid/liquid separation, the leach residue containing liberated gold particles is rendered alkaline by addition of lime and subjected to cyanide leaching, in which gold is dissolved. This technology has already been applied on a commercial scale in Brazil and South Africa, while intensive plant evaluation of the process is in progress in other countries. RP TORMA, AE (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 46 TC 1 Z9 1 U1 1 U2 1 PU INST MATERIALS PI LONDON PA 1 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5DB SN 0308-0188 J9 INTERDISCIPL SCI REV JI Interdiscip. Sci. Rev. PD DEC PY 1992 VL 17 IS 4 BP 366 EP 370 PG 5 WC Multidisciplinary Sciences; Social Sciences, Interdisciplinary SC Science & Technology - Other Topics; Social Sciences - Other Topics GA MK923 UT WOS:A1992MK92300015 ER PT J AU LIN, MC HE, Y MELIUS, CF AF LIN, MC HE, Y MELIUS, CF TI COMMUNICATION - IMPLICATIONS OF THE HCN -] HNC PROCESS TO HIGH-TEMPERATURE NITROGEN-CONTAINING FUEL CHEMISTRY SO INTERNATIONAL JOURNAL OF CHEMICAL KINETICS LA English DT Article ID RATE COEFFICIENT AB We have found in our recent kinetic study of the oxidation of HCN by NO2 in the temperature range 623-773 K that HNCO and CO2 are very important early products. The measured kinetic data cannot be accounted for by a "conventional" mechanism involving HCN reactions with NO2, O, and OH. However, the introduction of the isomerization reaction HCN --> HNC, followed by the rapid oxidation of HNC by NO2, O, and OH, can quantitatively simulate all measured kinetic data. A similar study of the NO2 + HCN reaction in shock waves at temperatures between 1500 and 2400 K also required the inclusion of HNC reactions in order to quantitatively account for measured product distributions. The effects of the HNC molecule on the high temperature HCN chemistry are discussed in terms of the predicted rate constants for HNC reactions with O and OH employing the BAC-MP4 method. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94552. RP LIN, MC (reprint author), EMORY UNIV,DEPT CHEM,ATLANTA,GA 30322, USA. NR 17 TC 30 Z9 30 U1 0 U2 12 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0538-8066 J9 INT J CHEM KINET JI Int. J. Chem. Kinet. PD DEC PY 1992 VL 24 IS 12 BP 1103 EP 1107 DI 10.1002/kin.550241208 PG 5 WC Chemistry, Physical SC Chemistry GA JX874 UT WOS:A1992JX87400007 ER PT J AU AHMED, FE AF AHMED, FE TI THE ETIOLOGY OF SCOMBROTOXICOSIS - RESPONSE SO INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY LA English DT Letter ID HISTAMINE RP AHMED, FE (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0950-5423 J9 INT J FOOD SCI TECH JI Int. J. Food Sci. Technol. PD DEC PY 1992 VL 27 IS 6 BP 725 EP 726 PG 2 WC Food Science & Technology SC Food Science & Technology GA KN964 UT WOS:A1992KN96400016 ER PT J AU WANG, CZ ZHANG, BL XU, CH CHAN, CT HO, KM AF WANG, CZ ZHANG, BL XU, CH CHAN, CT HO, KM TI STRUCTURES AND STABILITIES OF CARBON FULLERENES SO INTERNATIONAL JOURNAL OF MODERN PHYSICS B LA English DT Article; Proceedings Paper CT ADRIATICO RESEARCH CONF ON CLUSTERS AND FULLERENES CY JUN 23-26, 1992 CL INT CTR THEORET PHYS, TRIESTE, ITALY SP FDN IBM ITALIA, SISSA HO INT CTR THEORET PHYS AB The structures and stabilities of carbon fullerenes C(n) (n = 20-94) are studied with tight-binding molecular dynamics in combination with a new scheme for generating energetically favorable fullerene networks. Magic numbers for fullerene formation energy are observed at n=60,70 and 84. The experimental observation of the more abundant fullerenes is related to the fragmentation stabilities and chemical reactivities of the fullerenes obtained from our calculations. RP WANG, CZ (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 0 TC 7 Z9 7 U1 1 U2 2 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-9792 J9 INT J MOD PHYS B JI Int. J. Mod. Phys. B PD DEC PY 1992 VL 6 IS 23-24 BP 3833 EP 3838 DI 10.1142/S0217979292001894 PG 6 WC Physics, Applied; Physics, Condensed Matter; Physics, Mathematical SC Physics GA KN274 UT WOS:A1992KN27400026 ER PT J AU RAMSEY, EW JENSEN, JR MACKEY, H GLADDEN, J AF RAMSEY, EW JENSEN, JR MACKEY, H GLADDEN, J TI REMOTE-SENSING OF WATER-QUALITY IN ACTIVE TO INACTIVE COOLING WATER RESERVOIRS SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID YELLOW SUBSTANCE; SEA; ABSORPTION; PHYTOPLANKTON; LIGHT; LAYER AB Airborne Daedalus DS-1260 MSS data were acquired over three water cooling reservoirs (active to inactive, large (1068 ha) to small (68.6 ha)) concurrent with field data collection to map the distribution of the water quality as related to the trophic state within each reservoir. Water characteristics, including algal pigments, total suspended particles, as well as dissolved and particulate organic matter, were obtained at 31 sites. These water quality measurements were evaluated in terms of their importance in explaining water phenomena observed by using remote sensing reflectance images. Measurements that exhibited unique variances were related to remote sensing data using a statistical methodology to identify relations explaining the greatest amount of variance for each water variable. This approach resulted in predictor equations explaining 91 per cent of the chlorophyll-a variance, 91 per cent of the total suspended particles variance, and 98 per cent of a Trophic State Index variance based on the depth of light penetration. Further, remotely-sensed thermal data explained 88 per cent of the measured surface water temperature variance. These relations were used to produce maps depicting the quantitative distribution of these water quality variables and the bulk near-surface water temperature distribution within the active water cooling reservoir. The two-water cooling reservoirs not affected by thermal inflows were characterized by water containing very low and uniform concentrations of all water property measures. Conversely, the thermally active reservoir was characterized by higher and more variable water property concentrations; there was a spatial covariation between decreases in the bulk near-surface water temperature and increases in almost all water quality indicators. C1 UNIV S CAROLINA,DEPT GEOG,COLUMBIA,SC 29208. WESTINGHOUSE SAVANNAH RIVER SITE,SAVANNAH RIVER LAB,AIKEN,SC 29808. NR 37 TC 5 Z9 6 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD DEC PY 1992 VL 13 IS 18 BP 3465 EP 3488 PG 24 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA KG700 UT WOS:A1992KG70000006 ER PT J AU ROSENFELD, AH AF ROSENFELD, AH TI SAVING ENERGY - PROS AND CONS SO ISSUES IN SCIENCE AND TECHNOLOGY LA English DT Letter C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR BLDG SCI,BERKELEY,CA 94720. RP ROSENFELD, AH (reprint author), UNIV CALIF BERKELEY,PHYS,BERKELEY,CA 94720, 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 17 EP 18 PG 2 WC Engineering, Multidisciplinary; Engineering, Industrial; Multidisciplinary Sciences; Social Issues SC Engineering; Science & Technology - Other Topics; Social Issues GA GZ168 UT WOS:A1992GZ16800021 ER PT J AU FIELD, JB TOPRAKCIOGLU, C DAI, L HADZIIOANNOU, G SMITH, G HAMILTON, W AF FIELD, JB TOPRAKCIOGLU, C DAI, L HADZIIOANNOU, G SMITH, G HAMILTON, W TI NEUTRON REFLECTIVITY STUDY OF END-ADSORBED DIBLOCK COPOLYMERS - CROSS-OVER FROM MUSHROOMS TO BRUSHES SO JOURNAL DE PHYSIQUE II LA English DT Article ID BLOCK COPOLYMERS; ADSORPTION-KINETICS; DENSITY PROFILE; POLYMER BRUSH; GOOD SOLVENT; MONTE-CARLO; SURFACES; CHAINS; INTERFACES AB We report neutron reflectivity data on polystyrene-poly(vinyl-2-pyridine) (PS-PVP) diblock copolymers adsorbed onto quartz from the selective solvent toluene (a good solvent for PS, but a poor one for PVP). The PVP << anchor >> block adsorbs strongly to form a thin layer on the quartz substrate, while the PS chains dangle into the solvent. The grafting density of the non-adsorbing PS chains is varied by varying the size of the PVP block, while the PS molecular weight is kept constant. The PS adsorbance decreases systematically with increasing PVP molecular weight. The form of the polymer density profile normal to the substrate is found to change with the PS grafting density, and a transition from a << brush >> to a << mushroom >> conformation is observed as the PVP molecular weight is increased. For the copolymers with a high PVP content, the dependence of the maximum in the polymer density profile on the mean distance, s, between anchor points obeys the scaling law expected of mushrooms, while s increases with increasing molecular weight of the anchor block also in a manner consistent with a mushroom model. C1 UNIV GRONINGEN,DEPT POLYMER CHEM,9747 AG GRONINGEN,NETHERLANDS. LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545. RP FIELD, JB (reprint author), UNIV CAMBRIDGE,CAVENDISH LAB,MADINGLEY RD,CAMBRIDGE CB3 0HE,ENGLAND. NR 28 TC 63 Z9 63 U1 2 U2 7 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4312 J9 J PHYS II JI J. Phys. II PD DEC PY 1992 VL 2 IS 12 BP 2221 EP 2235 PG 15 WC Mechanics; Physics, Atomic, Molecular & Chemical SC Mechanics; Physics GA KF051 UT WOS:A1992KF05100013 ER PT J AU LEHNERT, BE ORTIZ, JB STEINKAMP, JA TIETJEN, GL SEBRING, RJ OBERDORSTER, G AF LEHNERT, BE ORTIZ, JB STEINKAMP, JA TIETJEN, GL SEBRING, RJ OBERDORSTER, G TI MECHANISMS UNDERLYING THE PARTICLE REDISTRIBUTION PHENOMENON SO JOURNAL OF AEROSOL MEDICINE-DEPOSITION CLEARANCE AND EFFECTS IN THE LUNG LA English DT Article DE PARTICLE REDISTRIBUTION PHENOMENON; ALVEOLAR MACROPHAGES; ALVEOLAR CLEARANCE; MACROPHAGE PROLIFERATION; MACROPHAGE FUSION; MACROPHAGE AUTOLYSIS AB Existing evidence has suggested thal relatively insoluble particles are gradually redistributed among alveolar macrophages (AM) during alveolar clearance. To obtain information about mechanisms that may be operable in the redistribution of particles, lavaged lung free cell analyses and transmission electron microscopic (TEM) analyses of lung tissue were performed after rats were subchronically exposed to aerosolized titanium dioxide. Results from assessments of particulate TiO2-AM relationships during the clearance of the particles were consistent with a gradual redistribution of the TiO2 among the lung's AM. TEM analyses indicated that the in situ autolysis of particle-containing AM is one mechanism involved in the redistribution of particles. Evidence was also obtained that indicated that the engulfment of one particle-containing phagocyte by another also occurs. Based on the observation of mitotic figures of particle-containing AM among lavaged lung free cells after particle deposition in the lung, as well as other lines of evidence that AM can replicate, another prominent mechanism of the particle redistribution phenomenon may be the in situ proliferation of particle-laden AM. In another component of the study, accordingly, we used the macrophage cell line J774A.1 as a surrogate for AM to investigate how different particulate loads in macrophages affect their abilities lo proliferate in vitro, and to examine how particles are allocated from particle-laden parent macrophages to their progeny. The rate of proliferation of macrophages was unaffected by the containment of relatively high particulate burdens, and the allocation of particles to progeny macrophages appeared to be an uneven process. In the last component of our study, results from analyses for multinucleated AM among lavaged lung free cells during the alveolar clearance of three different burdens of polystyrene microspheres suggest that the fusion of particle-containing AM is not an important particle-''accreting'' mechanism, which potentially could operate in opposition to the gradual dispersion of retained particles among the lung's AM population. RP LEHNERT, BE (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,CELL GROWTH DAMAGE & REPAIR GRP,LS-1,MS M888,LOS ALAMOS,NM 87545, USA. NR 0 TC 7 Z9 8 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0894-2684 J9 J AEROSOL MED JI J. Aerosol Med.-Depos. Clear. Eff. Lung PD WIN PY 1992 VL 5 IS 4 BP 261 EP 277 DI 10.1089/jam.1992.5.261 PG 17 WC Public, Environmental & Occupational Health; Respiratory System SC Public, Environmental & Occupational Health; Respiratory System GA KG518 UT WOS:A1992KG51800005 ER PT J AU LEACH, MJ PATRINOS, AAN AF LEACH, MJ PATRINOS, AAN TI COASTAL CIRCULATIONS AND THEIR INFLUENCE ON DEPOSITION PATTERNS IN THE WASHINGTON, DC AREA SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID MESOSCALE AB The existence of coastal fronts and their effects on deposition patterns in the Washington, D.C. area are presented in this paper. The data are from an experiment conducted from October 1986 to March 1987. An earlier paper by Patrinos et al. presented the details of the deposition patterns. The results presented in that paper were not entirely consistent with the experiment's hypothesis; that is, synoptic-scale southeasterly surface flow would produce excess deposition northwest of the city. Instead, excess deposition was found to the southeast of the urban area. This paper examines the meteorology more closely and shows how small-scale meteorological circulations influence the flow fields and deposition patterns. The wind fields in the experiment area were more northerly to northeasterly in response to coastal circulations, rather than southeasterly as expected from the synoptic conditions. The meteorology and deposition patterns from four cases are presented, with evidence of coastal circulations apparent in three of the four cases. C1 US DOE,GERMANTOWN,MD. BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHERE SCI,UPTON,NY 11973. NR 9 TC 1 Z9 1 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD DEC PY 1992 VL 31 IS 12 BP 1439 EP 1456 DI 10.1175/1520-0450(1992)031<1439:CCATIO>2.0.CO;2 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KB863 UT WOS:A1992KB86300007 ER PT J AU SAPPEY, AD GAMBLE, TK AF SAPPEY, AD GAMBLE, TK TI PLANAR LASER-INDUCED FLUORESCENCE IMAGING OF CU ATOM AND CU-2 IN A CONDENSING LASER-ABLATED COPPER PLASMA PLUME SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CLUSTER BEAMS; SPECTROSCOPY; DEPOSITION; TRIMER AB Planar laser-induced- fluorescence (PLIF) is used to monitor Cu atoms and Cu2 produced by excimer laser ablation of a copper target (308 nm, > 10 J/cm2, 1-3 GW/cm2) expanding rapidly into helium background gas at pressures ranging from 10 to 100 Torr. The Cu2 results from gas phase condensation of the copper atoms ablated from the target in the regions of highest Cu atom density as expected, but the maximum Cu2 laser-induced fluorescence (LIF) signal occurs significantly after the maximum of the Cu signal. Rotationally resolved excitation scans of Cu2 utilizing the A-X (0,0) transition indicate that the Cu2 has reached equilibrium with the 300 K background gas. An extensive search for Cu3 via LIF failed, indicating that Cu3 is present only in very low "steady state" number density in the plume. This data is explained qualitatively by a simple kinetic model. In addition to the kinetic information, it is clear from the PLIF images that viscous eddy formation becomes more pronounced as the backing gas pressure increases; however, we see no evidence of turbulence in the plume even at the highest backing gas pressure studied. The PLIF technique allows us to observe the onset of condensation directly as well as to obtain information about the expansion dynamics of the plume not easily obtainable by other means. RP SAPPEY, AD (reprint author), LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 34 TC 37 Z9 38 U1 0 U2 6 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 5095 EP 5107 DI 10.1063/1.352039 PG 13 WC Physics, Applied SC Physics GA KA932 UT WOS:A1992KA93200010 ER PT J AU CHENG, YA SMITH, DJ STEARNS, MB STEARNS, DG AF CHENG, YA SMITH, DJ STEARNS, MB STEARNS, DG TI IMAGING X-RAY MULTILAYER STRUCTURES USING CROSS-SECTIONAL HIGH-RESOLUTION ELECTRON-MICROSCOPY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MIRRORS AB Mo/Si soft x-ray multilayer films have been imaged in cross section by high resolution electron microscopy and the dependence of important multilayer parameters on imaging conditions has been investigated. Multiple measurements of the widths of the Mo crystalline layers were made from images recorded as part of a through-focal series. The layer thicknesses were found to be insensitive to the focus setting near the Scherzer defocus value (+160 angstrom to -800 angstrom). At larger defocus conditions, however, additional Mo fringes were visible so that the Mo crystalline region seemed to become thicker at the expense of the pure Si and interlayer regions. Micrographs recorded with the ML slightly tilted (approximately 1-2-degrees) from the edge-on orientation suggested thicker Mo and thinner Si and interlayer regions but the apparent bilayer periodicity did not change measurably. The possibility of changes in multilayer structure induced during cross-sectional specimen preparation was also shown. Finally, the results of the image analysis are compared with those obtained from small and large angle x-ray scattering experiments from the same C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. ARIZONA STATE UNIV, CTR SOLID STATE PHYS, TEMPE, AZ 85287 USA. RP ARIZONA STATE UNIV, DEPT PHYS & ASTRON, TEMPE, AZ 85287 USA. NR 19 TC 14 Z9 15 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1992 VL 72 IS 11 BP 5165 EP 5171 DI 10.1063/1.351996 PG 7 WC Physics, Applied SC Physics GA KA932 UT WOS:A1992KA93200019 ER PT J AU SCHNEIDER, RP JONES, ED LOTT, JA BRYAN, RP AF SCHNEIDER, RP JONES, ED LOTT, JA BRYAN, RP TI PHOTOLUMINESCENCE LINEWIDTHS IN METALORGANIC VAPOR-PHASE EPITAXIALLY GROWN ORDERED AND DISORDERED INALGAP ALLOYS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BAND-GAP ENERGY; OPTICAL-PROPERTIES; GAINP; GA0.52IN0.48P; MOVPE AB The dependence of the photoluminescent properties of In0.48(AlyGa1-y)0.52P alloys (0 less-than-or-equal-to y less-than-or-equal-to 0.5) on growth temperature and substrate misorientation off GaAs(100) has been studied. Samples were grown using low-pressure metalorganic vapor phase epitaxy. By studying the dependence of ordering behavior in InGaP as a function of substrate misorientation and growth temperature simultaneously, a very large range in low-temperature photoluminescence emission energy-135 meV-has been obtained. The photoluminescence linewidth exhibits a strong, continuous dependence on the extent of atomic ordering (the emission energy) in the alloys. The results indicate that inhomogeneity in the microstructure of the material (i.e., between "ordered" domains and the "disordered" matrix) is the dominant photoluminescence broadening mechanism. This investigation has allowed a significant optimization of the optical properties of these materials, including the narrowest low-temperature photoluminescent linewidths reported for all of the In(AlyGa1-y)P alloys exhibiting direct band gaps (4.2 meV for InGaP). RP SCHNEIDER, RP (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 21 TC 43 Z9 43 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1992 VL 72 IS 11 BP 5397 EP 5400 DI 10.1063/1.352354 PG 4 WC Physics, Applied SC Physics GA KA932 UT WOS:A1992KA93200055 ER PT J AU BOETTGER, JC AF BOETTGER, JC TI NEW MODEL FOR THE SHOCK-INDUCED ALPHA-QUARTZ -]STISHOVITE PHASE-TRANSITION IN SILICA SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TEMPERATURES; DEFORMATION; PRESSURE; SOLIDS AB A new model has been developed to describe the alpha-quartz to stishovite phase transition in silica under shock-loading conditions. During hydrodynamic simulations, individual global equations of state for the alpha-quartz and stishovite phases of silica are mixed in accordance with process-dependent constraints on the Gibbs free energy difference between the phases (DELTAG). For the shock-induced transition, DELTAG is required to equal a simple two parameter function of the mass fraction of stishovite. Unlike previous models, the new constraint equation assumes that the shock induced phase transition begins at the equilibrium phase boundary, but is not completed unless peak stresses on the order of 40 GPa are achieved.On release, the reverse transition is required to satisfy the usual thermodynamic equilibrium condition (DELTAG=0). It is shown that hydrodynamic simulations combining this hysteretic phase transition model with a strength model that assumes partial softening after yielding are capable of reproducing experimental Hugoniot and release data for crystalline silica in the mixed-phase region. RP BOETTGER, JC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 43 TC 12 Z9 12 U1 1 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1992 VL 72 IS 11 BP 5500 EP 5508 DI 10.1063/1.351945 PG 9 WC Physics, Applied SC Physics GA KA932 UT WOS:A1992KA93200074 ER PT J AU SPROCK, M WU, X KING, TS AF SPROCK, M WU, X KING, TS TI N-BUTANE HYDROGENOLYSIS OVER SILICA-SUPPORTED RU-CU CATALYSTS SO JOURNAL OF CATALYSIS LA English DT Article ID SINGLE-CRYSTAL SURFACES; HYDROCARBON REACTIONS; BIMETALLIC CATALYSTS; ETHANE HYDROGENOLYSIS; IRIDIUM CATALYSTS; PARTICLE-SIZE; RUTHENIUM; COPPER; CHEMISORPTION; KINETICS C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP SPROCK, M (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,231 SWEENEY HALL,AMES,IA 50011, USA. NR 51 TC 12 Z9 12 U1 1 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9517 J9 J CATAL JI J. Catal. PD DEC PY 1992 VL 138 IS 2 BP 617 EP 629 DI 10.1016/0021-9517(92)90311-5 PG 13 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA KB668 UT WOS:A1992KB66800017 ER PT J AU HOLMES, DJ AF HOLMES, DJ TI ODORS AS CUES FOR ORIENTATION TO MOTHERS BY WEANLING VIRGINIA OPOSSUMS SO JOURNAL OF CHEMICAL ECOLOGY LA English DT Article DE DIDELPHIS-VIRGINIANA; DIDEPHIDAE; MATERNAL YOUNG RECOGNITION; MATERNAL ODORS; POUCH GLANDS; VIRGINIA OPOSSUM ID MONODELPHIS-DOMESTICA; SOCIAL-BEHAVIOR AB Three experiments were conducted to investigate whether whole-body and pouch odors facilitate social cohesion between young Virginia opossums and their mothers just prior to weaning. In experiment 1, young oriented toward plastic buckets containing their mothers, directing significantly higher levels of investigative behavior and more distress vocalizations toward them than toward buckets containing unrelated lactating females. In experiment 2, young oriented toward and investigated empty buckets containing whole-body odors of their mothers more than empty buckets containing odors of other females. Similarly, more investigative behavior was directed toward plastic bucket lids containing pouch odors from subjects' mothers than toward pouch odors from unrelated females in experiment 3. These results suggest that social odors help young didelphid marsupials maintain contact with their mothers, as in other mammals, and that whole-body and pouch gland odors are important chemical signals in this nongregarious species. C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP HOLMES, DJ (reprint author), HARVARD UNIV,DEPT ORGANISM & EVOLUT BIOL,CAMBRIDGE,MA 02138, USA. NR 31 TC 3 Z9 3 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0098-0331 J9 J CHEM ECOL JI J. Chem. Ecol. PD DEC PY 1992 VL 18 IS 12 BP 2251 EP 2259 DI 10.1007/BF00984948 PG 9 WC Biochemistry & Molecular Biology; Ecology SC Biochemistry & Molecular Biology; Environmental Sciences & Ecology GA KD096 UT WOS:A1992KD09600007 PM 24254869 ER PT J AU DEHMER, JL DEHMER, PM WEST, JB HAYES, MA SIGGEL, MRF PARR, AC AF DEHMER, JL DEHMER, PM WEST, JB HAYES, MA SIGGEL, MRF PARR, AC TI VIBRATIONAL AUTOIONIZATION IN H-2 - VIBRATIONAL BRANCHING RATIOS AND PHOTOELECTRON ANGULAR-DISTRIBUTIONS NEAR THE V+ = 3 THRESHOLD SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID QUANTUM DEFECT THEORY; DYNAMIC COUPLING PHENOMENA; MOLECULAR EXCITED STATES; HIGH-RESOLUTION; H2; PREDISSOCIATION; PREIONIZATION AB Vibrational branching ratios and photoelectron angular distributions are reported for photoionization of normal (the equilibrium ortho/para mixture) hydrogen in the region just above the upsilon+=3 ionization limit. This region contains a number of vibrationally autoionizing Rydberg states, and the goal of the work was to observe experimentally the characteristic behavior associated with the decay of these states that was predicted by Raoult and Jungen V. Chem. Phys. 74, 3388 (1981)] on the basis of an MQDT (multichannel quantum defect theory) calculation on para-H-2 (J"=0). We have indeed observed that vibrational autoionization strongly favors the ionization channel representing the minimum change in the vibrational state of the ion core, as predicted. We also observed a sharp reduction in the photo-electron asymmetry of the upsilon+=3 (and, to a lesser extent, the upsilon+=2) ionization channel for resonant photoionization. Hence, qualitative agreement with theory is observed; however, a quantitative comparison now requires an extended calculation that includes the additional rotational levels that were populated under the present experimental conditions. C1 SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP DEHMER, JL (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 23 TC 23 Z9 23 U1 0 U2 0 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 DEC 1 PY 1992 VL 97 IS 11 BP 7911 EP 7917 DI 10.1063/1.463466 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KA706 UT WOS:A1992KA70600006 ER PT J AU THOMAN, JW GRAY, JA DURANT, JL PAUL, PH AF THOMAN, JW GRAY, JA DURANT, JL PAUL, PH TI COLLISIONAL ELECTRONIC QUENCHING OF NO A 2-SIGMA+ BY N2 FROM 300 TO 4500-K SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NITRIC-OXIDE; VIBRATIONAL-RELAXATION; ENERGY-TRANSFER; RYDBERG STATES; A2-SIGMA+; FLUORESCENCE; MECHANISM; LIFETIMES; NITROGEN; A2SIGMA+ AB We report rate coefficients for electronic quenching of NO A 2SIGMA+ upsilon'=0 by N2 measured at room temperature and at high temperatures behind reproducible shock waves. The quenching cross section increases from 0.007 angstrom2 at 300 K to 7 angstrom2 at 4500 K, and the temperature dependence in the range 300-2300 K is best understood using a charge-transfer (harpoon) collision model. We also record dispersed fluorescence spectra and time-resolved fluorescence from both the directly pumped level (upsilon'=0) and a collisionally populated level (upsilon'=1); from these results we obtain rate coefficients for vibrational energy transfer in NO (A) and electronic quenching of upsilon'=1 at 1900 K. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. RP THOMAN, JW (reprint author), WILLIAMS COLL,DEPT CHEM,WILLIAMSTOWN,MA 01267, USA. NR 31 TC 50 Z9 50 U1 2 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1992 VL 97 IS 11 BP 8156 EP 8163 DI 10.1063/1.463437 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KA706 UT WOS:A1992KA70600029 ER PT J AU ZHAO, W ZHAO, X SOKOLOV, J RAFAILOVICH, MH SANYAL, MK SINHA, SK CAO, BH KIM, MW SAUER, BB AF ZHAO, W ZHAO, X SOKOLOV, J RAFAILOVICH, MH SANYAL, MK SINHA, SK CAO, BH KIM, MW SAUER, BB TI DIFFUSE-X-RAY SCATTERING STUDY OF TOLUENE AND POLYBROMOSTYRENE PBRS/TOLUENE SOLUTIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POLYMER-SOLUTIONS; SURFACE-MODES; WATER; REFLECTIVITY AB We report measurements and calculations of x-ray diffuse scattering from the liquid-vapor interface of toluene and polybromostyrene(PBrS)/toluene solutions for polymer molecular weights 90 K and 1 M at concentrations up to 11.7 volume %, well into the entangled semidilute regime. We have calculated the static structure factor S(k) and equal time height-height correlation function C(R) for surface hydrodynamic modes based on a coupled two-fluid model where the polymer response is taken to be that of a Maxwell viscoelastic material [Harden et al., J. Chem. Phys. 94, 5208 (1991)]. We obtain the leading correction term to the capillary-wave result for C(R) dependent on the solution shear modulus E0, as well as an analytic approximation valid for large E0, including the case of pure polymer melt. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. EXXON RES & ENGN CO,CORP RES LABS,ANNANDALE,NJ 08801. CUNY CITY COLL,DEPT PHYS,NEW YORK,NY 10031. DUPONT CO,EXPTL STN,WILMINGTON,DE 19898. RP ZHAO, W (reprint author), CUNY QUEENS COLL,DEPT PHYS,FLUSHING,NY 11367, USA. RI Kim, Mahn Won/C-1541-2011; sanyal, milan/J-2527-2015 OI sanyal, milan/0000-0002-3847-8793 NR 26 TC 19 Z9 19 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1992 VL 97 IS 11 BP 8536 EP 8542 DI 10.1063/1.463371 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KA706 UT WOS:A1992KA70600069 ER PT J AU SASSI, AP BELTRAN, S HOOPER, HH BLANCH, HW PRAUSNITZ, J SIEGEL, RA AF SASSI, AP BELTRAN, S HOOPER, HH BLANCH, HW PRAUSNITZ, J SIEGEL, RA TI MONTE-CARLO SIMULATIONS OF HYDROPHOBIC WEAK POLYELECTROLYTES - TITRATION PROPERTIES AND PH-INDUCED STRUCTURAL TRANSITIONS FOR POLYMERS CONTAINING WEAK ELECTROLYTES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID IONIZATION; POLYACIDS AB Monte Carlo simulation has been used to study titration and configurational Properties Of an isolated hydrophobic polymer containing weakly-ionizable groups. Using a cubic lattice, simulations were performed in the grand canonical ensemble to include the effect of the local charge environment on the ionization of weak electrolyte segments. Properties were studied as a function of polymer hydrophobicity, fraction of ionizable segments, solution ionic strength, and pH. The polymer segments experienced three types of competing interaction: excluded volume, attractive nearest-neighbor forces which account for the net balance of segment-segment, segment-solvent, and solvent-solvent interactions, and long-range electrostatic forces between ionized segments, calculated with a screened Debye-Huckel potential. Simulations show that the model chain expands with chain ionization, which depends on solution pH. As the chain becomes increasingly charged, the ionization process becomes more difficult because of rising local charge density around the ionizable segments. The effect of rising local charge density increases for larger fractions of ionizable groups, with increased hydrophobicity and with low ionic strength. C1 UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,DEPT PHARM & PHARMACEUT CHEM,SAN FRANCISCO,CA 94143. OI Beltran, Sagrario/0000-0003-2559-3925 NR 26 TC 40 Z9 40 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD DEC 1 PY 1992 VL 97 IS 11 BP 8767 EP 8774 DI 10.1063/1.463346 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KA706 UT WOS:A1992KA70600094 ER PT J AU DANIELS, RC AF DANIELS, RC TI SEA-LEVEL RISE ON THE SOUTH-CAROLINA COAST - 2 CASE-STUDIES FOR 2100 SO JOURNAL OF COASTAL RESEARCH LA English DT Article DE CLIMATE CHANGE; LOCAL VERTICAL MOVEMENT; SEA-LEVEL RISE; STORM SURGE; TROPICAL CYCLONES; WAVE PREDICTION AB Over the next century a "greenhouse"-induced sea-level rise (SLR) of 0.25 m to 2.00 m may occur. This SLR, when combined with local vertical movements along coasts, has the potential to cause significant changes in the South Carolina coastline. These changes may occur through the inundation of low-lying coastal areas, increases in erosion rates from increased wave heights and possible increases in tropical cyclone intensities and frequencies. To explore the potential effects of climate change on the South Carolina coast, four SLR scenarios were applied to two USGS 7.5' quadrangles (Wampee and Hilton Head, South Carolina). The impacts of SLR were measured in terms of the amount of land that would be lost to the sea permanently (from SLR and local vertical movement) and episodically (from tropical cyclone-induced storm surges) if the current coastline was abandoned and the retreat option taken. Based on results from the case studies, the following conclusions were drawn: (1) studies on the regional effects of SLR must consider local vertical movement in order to be valid, (2) as sea level rises the relief of coastal areas will decrease, increasing the percentage of land above mean sea level subject to episodic inundation, and (3) as local sea surface temperature rise, the maximum tropical cyclone-induced surge obtainable along the South Carolina coast will increase, and the probability of a storm occurring may also increase. RP DANIELS, RC (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 12 Z9 14 U1 0 U2 5 PU COASTAL EDUCATION & RESEARCH FOUNDATION PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0749-0208 J9 J COASTAL RES JI J. Coast. Res. PD WIN PY 1992 VL 8 IS 1 BP 56 EP 70 PG 15 WC Environmental Sciences; Geography, Physical; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Physical Geography; Geology GA HB254 UT WOS:A1992HB25400005 ER PT J AU MARTIN, JE ODINEK, J AF MARTIN, JE ODINEK, J TI ON THE TURBIDITY OF SILICA-GELS - AGGREGATION IN THE PRESENCE OF COULOMB INTERACTIONS SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Article ID DYNAMIC SCATTERING; COLLOIDAL SILICA; TRANSITION; VISCOELASTICITY; FLUCTUATIONS; FRACTALS; DECAY RP MARTIN, JE (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 25 TC 8 Z9 8 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 0021-9797 J9 J COLLOID INTERF SCI JI J. Colloid Interface Sci. PD DEC PY 1992 VL 154 IS 2 BP 461 EP 480 DI 10.1016/0021-9797(92)90162-F PG 20 WC Chemistry, Physical SC Chemistry GA KE615 UT WOS:A1992KE61500018 ER PT J AU MOREL, JE DENDY, JE HALL, ML WHITE, SW AF MOREL, JE DENDY, JE HALL, ML WHITE, SW TI A CELL-CENTERED LAGRANGIAN-MESH DIFFUSION DIFFERENCING SCHEME SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID SYSTEMS RP MOREL, JE (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 11 TC 34 Z9 43 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 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD DEC PY 1992 VL 103 IS 2 BP 286 EP 299 DI 10.1016/0021-9991(92)90402-K PG 14 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA KD206 UT WOS:A1992KD20600007 ER PT J AU NELSON, P SETH, DL RAY, AK AF NELSON, P SETH, DL RAY, AK TI A COMPUTATIONAL STUDY OF THE DISCRETIZATION ERROR IN THE SOLUTION OF THE SPENCER-LEWIS EQUATION BY DOUBLING APPLIED TO THE UPWIND FINITE-DIFFERENCE APPROXIMATION SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID ELECTRON-TRANSPORT; OPERATOR; SCATTERING C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. UNIV TEXAS,DEPT PHYS,ARLINGTON,TX 76019. RP NELSON, P (reprint author), TEXAS A&M UNIV SYST,DEPT COMP SCI,COLL STN,TX 77843, USA. NR 26 TC 3 Z9 3 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 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD DEC PY 1992 VL 103 IS 2 BP 370 EP 381 DI 10.1016/0021-9991(92)90408-Q PG 12 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA KD206 UT WOS:A1992KD20600013 ER PT J AU SHARP, JW ERES, D AF SHARP, JW ERES, D TI INSITU OBSERVATION OF SURFACE-LIMITED GE GROWTH-PROCESSES BY TRANSIENT OPTICAL REFLECTOMETRY SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; MOLECULAR-BEAM; REFLECTANCE-DIFFERENCE; HYDROGEN DESORPTION; SILICON 111; KINETICS; SI; ADSORPTION; SI(111); OXYGEN AB Optical surface reflectometry was used to monitor the active layer during the epitaxial growth of Ge from pulsed molecular jets of digermane (Ge2H6) Molecules. The modulation of the digermane delivery facilitates the separation and independent investigation of the elementary reaction steps, digermane chemisorption and reaction by-product desorption. For (100) surfaces of Si and Ge, both the chemisorption and desorption processes were found to be first-order. The digermane chemisorption was not thermally activated, while the desorption rate was strongly temperature-dependent. For Ge(100) substrates and the temperature ranges 410-480 and 480-570-degrees-C, desorption activation energies of 2.2 +/- 0.1 and 1.6 +/- 0.1 eV were determined, respectively, and the corresponding pre-exponential factors were 4.9 x 10(16 +/- 0.7) and 3.5 x 10(12 +/- 0.6) s-1. The lower activation energy is in agreement with the expected value for desorption of H-2 from the monohydride phase. The difference in kinetic parameters between the two temperature ranges is believed to be caused by the presence of oxygen contamination at lower substrate temperatures. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP SHARP, JW (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Eres, Gyula/C-4656-2017 OI Eres, Gyula/0000-0003-2690-5214 NR 36 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD DEC PY 1992 VL 125 IS 3-4 BP 553 EP 567 DI 10.1016/0022-0248(92)90296-U PG 15 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA KF738 UT WOS:A1992KF73800020 ER PT J AU TAKAC, P AF TAKAC, P TI ASYMPTOTIC-BEHAVIOR OF STRONGLY MONOTONE TIME-PERIODIC DYNAMIC PROCESSES WITH SYMMETRY SO JOURNAL OF DIFFERENTIAL EQUATIONS LA English DT Article ID DIFFERENTIAL-EQUATIONS; PARABOLIC-SYSTEMS; BANACH-SPACES; CONVERGENCE; STABILITY; COMPETITION; SEMIGROUPS C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. RP TAKAC, P (reprint author), VANDERBILT UNIV,DEPT MATH,NASHVILLE,TN 37235, USA. NR 27 TC 14 Z9 14 U1 1 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-0396 J9 J DIFFER EQUATIONS JI J. Differ. Equ. PD DEC PY 1992 VL 100 IS 2 BP 355 EP 378 DI 10.1016/0022-0396(92)90119-8 PG 24 WC Mathematics SC Mathematics GA KD968 UT WOS:A1992KD96800008 ER PT J AU JANSEN, JF KRESS, RL BABCOCK, SM AF JANSEN, JF KRESS, RL BABCOCK, SM TI CONTROLLER-DESIGN FOR A FORCE-REFLECTING TELEOPERATOR SYSTEM WITH KINEMATICALLY DISSIMILAR MASTER AND SLAVE SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article AB The purpose of this paper is to develop a controller for a force-reflecting teleoperator system having kinematically dissimilar master and slave. The controller is a stiffness controller for both the master and the slave. A mathematical problem associated with representing orientations using Euler angles is described, and Euler parameters are ProPosed as a solution, The basic properties of Euler parameters are presented, specifically those pertaining to stiffness control. The stiffness controller for both the master and the slave is formulated using Euler parameters to represent orientation and a Liapunov stability Proof is presented for the controller. The master portion of the control scheme is implemented on a six-degree-of-freedom master. RP JANSEN, JF (reprint author), OAK RIDGE NATL LAB,DIV ROBOT & PROC SYST,OAK RIDGE,TN 37831, USA. NR 21 TC 5 Z9 5 U1 0 U2 1 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 641 EP 649 DI 10.1115/1.2897736 PG 9 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA KF823 UT WOS:A1992KF82300017 ER PT J AU BENNETT, GA AF BENNETT, GA TI ANALYTICAL APPROACH TO SELECTING AND DESIGNING A MINIATURE DOWNHOLE REFRIGERATOR SO JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 15TH ANNUAL ENERGY-SOURCES TECHNOLOGY CONF AND EXHIBITION CY JAN 26-30, 1992 CL HOUSTON, TX SP AMER SOC MECH ENGINEERS AB The design approach and results from a series of analyses used to select a miniature high-temperature multi-watt refrigerator for thermally protecting downhole instruments are described. Thirty-one systems from nine physical or chemical processes were investigated and compared against the design criteria and constraints. Preliminary thermodynamic analyses and the results of a search for high-temperature components and refrigerants eliminated all but three processes and seven systems. These seven systems were re-evaluated based on a set of proposed design changes that reflect natural evolution from a prototype to commercial system application. Final selection considered refrigerator interactions with the geothermal logging system to define failure modes, ensure compatibility, and allow adaptability to changing conditions. The selected refrigerator design permits reliable, long- term active cooling of downhole instruments in hot wells. The consistent design, systematic analysis and unbiased selection process represent a new body of research results that provide potential for substantial advances in downhole thermal protection technology. RP BENNETT, GA (reprint author), LOS ALAMOS NATL LAB,ENERGY & ENVIRONM DIRECTORATE,LOS ALAMOS,NM 87544, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0195-0738 J9 J ENERG RESOUR-ASME JI J. Energy Resour. Technol.-Trans. ASME PD DEC PY 1992 VL 114 IS 4 BP 339 EP 344 DI 10.1115/1.2905962 PG 6 WC Energy & Fuels SC Energy & Fuels GA KF260 UT WOS:A1992KF26000012 ER PT J AU WOLDEGABRIEL, G WHITE, T SUWA, G SEMAW, S BEYENE, Y ASFAW, B WALTER, R AF WOLDEGABRIEL, G WHITE, T SUWA, G SEMAW, S BEYENE, Y ASFAW, B WALTER, R TI KESEM-KEBENA - A NEWLY DISCOVERED PALEOANTHROPOLOGICAL RESEARCH AREA IN ETHIOPIA SO JOURNAL OF FIELD ARCHAEOLOGY LA English DT Article ID MIDDLE AWASH VALLEY; RIFT-VALLEY; PLEISTOCENE; CONTEXTS; GEOLOGY; REGION; KENYA; BASIN AB The Paleoanthropological Inventory of Ethiopia is a long-term project designed to assess the paleoanthropological resources of the Ethiopian rift system. Inventory work completed in 1989 has established several new research areas. One of these, the Kesem-Kebena area near the northern terminus of the Main Ethiopian Rift, has now been investigated by the inventory team, and several vertebrate paleontological and archaeological localities have been discovered. The deposits range from >3.7 Ma (millions years of age; Pliocene) to Late Pleistocene. Important stratigraphic units were dated by conventional K/Ar dating on basaltic lavas and Ar-40/Ar-39 on feldspar separates from key tephra horizons. Among the most significant discoveries from the extensive Kesem-Kebena sedimentary succession are Pleistocene Acheulian lithic assemblages and Acheulian fauna dating to ca. 1.0 Ma. C1 UNIV CALIF BERKELEY,DEPT ANTHROPOL,BERKELEY,CA 94720. UNIV TOKYO,FAC SCI,DEPT ANTHROPOL,BUNKYO KU,TOKYO 113,JAPAN. RUTGERS STATE UNIV,DEPT ANTHROPOL,NEW BRUNSWICK,NJ 08903. MINIST CULTURE & SPORTS AFFAIRS,ADDIS ABABA,ETHIOPIA. BERKELEY GEOCHRONOL CTR,INST HUMAN ORIGINS,BERKELEY,CA 94709. RP WOLDEGABRIEL, G (reprint author), LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,EES-1 D462,LOS ALAMOS,NM 87545, USA. NR 58 TC 15 Z9 15 U1 0 U2 4 PU JOURNAL FIELD ARCHAEOLOGY PI BOSTON PA BOSTON UNIV 675 COMMUNWEALTH AVE, BOSTON, MA 02215 SN 0093-4690 J9 J FIELD ARCHAEOL JI J. Field Archaeol. PD WIN PY 1992 VL 19 IS 4 BP 471 EP 493 DI 10.2307/530428 PG 23 WC Archaeology SC Archaeology GA JX774 UT WOS:A1992JX77400003 ER PT J AU SHERMAN, M AF SHERMAN, M TI A POWER-LAW FORMULATION OF LAMINAR-FLOW IN SHORT PIPES SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB In the quantification of airflow through penetrations in buildings, it is necessary to be able to characterize the flow without detailed knowledge of the geometry of the paths. At the conditions typical of buildings, the flow regime is partially developed laminar flow. This report develops a theoretical description of the hydrodynamic relationship based on a power-law representation between the air flow and applied pressure for laminar flow in short pipes. It is found that short pipes can be described with a simple power law dependence on pressure, but that the exponent of the power law is itself a function of pressure. The entry length of the flow is derived based on a formulation for short, sharp-edged pipes. The theoretical formulation is compared to measured data. A dimensionless quantity, S, is defined to account for the power law behavior and maps simply to the flow exponent. The exponent or S number can be used to infer many of the characteristics of the flow and may prove useful in the in verse problem of determining flow geometry from fluid properties and the measured pressure and flow. RP SHERMAN, M (reprint author), LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720, USA. NR 17 TC 12 Z9 12 U1 1 U2 6 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD DEC PY 1992 VL 114 IS 4 BP 601 EP 605 DI 10.1115/1.2910073 PG 5 WC Engineering, Mechanical SC Engineering GA KF653 UT WOS:A1992KF65300017 ER PT J AU LINFORD, RK WEITZNER, H ABDOU, MA BALDWIN, DE BERKNER, KH BERRY, LA CULLER, FL DEAN, SO DEFREECE, DA GAUSTER, WB HOLDREN, JP HORA, RP NESS, NF OVERSKEI, DO PARKER, RR RUTHERFORD, PH SHAFFER, HW SIEMON, RE STEINER, D AF LINFORD, RK WEITZNER, H ABDOU, MA BALDWIN, DE BERKNER, KH BERRY, LA CULLER, FL DEAN, SO DEFREECE, DA GAUSTER, WB HOLDREN, JP HORA, RP NESS, NF OVERSKEI, DO PARKER, RR RUTHERFORD, PH SHAFFER, HW SIEMON, RE STEINER, D TI REPORT OF PANEL-1 - THE APPROPRIATE SCOPE AND MISSION OF ITER SO JOURNAL OF FUSION ENERGY LA English DT Article RP LINFORD, RK (reprint author), LOS ALAMOS NATL LAB,MAIL STOP H-854,LOS ALAMOS,NM 87544, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD DEC PY 1992 VL 11 IS 3-4 BP 139 EP 158 DI 10.1007/BF01059518 PG 20 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LK399 UT WOS:A1992LK39900003 ER PT J AU BALDWIN, DE SHEFFIELD, J CARRERAS, B DREYFUS, D GOLDSTON, R HIROOKA, Y HUTCHINSON, I IOTTI, R MCCRORY, R OVERSKEI, D PAPAY, L RIPIN, B ROSENBLUTH, M STAUDHAMMER, P AF BALDWIN, DE SHEFFIELD, J CARRERAS, B DREYFUS, D GOLDSTON, R HIROOKA, Y HUTCHINSON, I IOTTI, R MCCRORY, R OVERSKEI, D PAPAY, L RIPIN, B ROSENBLUTH, M STAUDHAMMER, P TI REPORT OF PANEL-2 - POST-TFTR INITIATIVES SO JOURNAL OF FUSION ENERGY LA English DT Article RP BALDWIN, DE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD DEC PY 1992 VL 11 IS 3-4 BP 159 EP 162 DI 10.1007/BF01059519 PG 4 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LK399 UT WOS:A1992LK39900004 ER PT J AU BALDWIN, DE WEITZNER, H DEAN, SO HAZELTINE, RD LUHMANN, N PRAGER, S RIPIN, B ROSENBLUTH, M SIEMON, R WOOTTON, A AF BALDWIN, DE WEITZNER, H DEAN, SO HAZELTINE, RD LUHMANN, N PRAGER, S RIPIN, B ROSENBLUTH, M SIEMON, R WOOTTON, A TI REPORT OF PANEL-4 - PRIORITIES IN THE INTERMEDIATE CONFINEMENT EXPERIMENTS SO JOURNAL OF FUSION ENERGY LA English DT Article RP BALDWIN, DE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD DEC PY 1992 VL 11 IS 3-4 BP 171 EP 208 DI 10.1007/BF01059521 PG 38 WC Nuclear Science & Technology SC Nuclear Science & Technology GA LK399 UT WOS:A1992LK39900006 ER PT J AU FARRIS, MH RUSSELL, CT THOMSEN, MF GOSLING, JT AF FARRIS, MH RUSSELL, CT THOMSEN, MF GOSLING, JT TI ISEE-1 AND ISEE-2 OBSERVATIONS OF THE HIGH BETA-SHOCK SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID EARTHS BOW SHOCK; MACH NUMBER; MAGNETIC-FIELD; PLASMA; THERMALIZATION; ANISOTROPY AB Measurements from the ISEE 1 and ISEE 2 spacecraft are used to examine the terrestrial bow shock under high beta conditions. On November 4, 1979, the large separation between the spacecraft, over 2500 km along the shock normal was such to allow simultaneous upstream and downstream measurements of the solar wind plasma for a period of about 8 min. These measurements are compared with and found to be in agreement with the predicted values of the Rankine-Hugoniot relations using the simple adiabatic approximation and a ratio of specific heats, gamma, of 5/3. No additional terms, such as the heat flux, are needed to bring the measured and predicted values into agreement. Large magnetic field and density fluctuations were observed, but average downstream plasma conditions well away from the shock were relatively steady, near the predicted Rankine-Hugoniot values. The magnetic disturbances persisted well downstream and a hot, dense ion beam was detected leaking from the downstream region of the shock. Both of these phenomena can be attributed to the excitation of the Alfven ion cyclotron instability, which acts quickly to isotropize the ions close to the ramp of the shock. Additional shock crossings under high beta conditions having smaller separations allow us to confirm many of these observations. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP FARRIS, MH (reprint author), UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024, USA. NR 19 TC 15 Z9 15 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 DEC 1 PY 1992 VL 97 IS A12 BP 19121 EP 19127 DI 10.1029/92JA01976 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD128 UT WOS:A1992KD12800002 ER PT J AU MOLDWIN, MB HUGHES, WJ AF MOLDWIN, MB HUGHES, WJ TI ON THE FORMATION AND EVOLUTION OF PLASMOIDS - A SURVEY OF ISEE-3 GEOTAIL DATA SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID DEEP GEOMAGNETIC TAIL; ENERGETIC ION BURSTS; DISTANT MAGNETOTAIL; MAGNETIC-FIELD; EARTHS MAGNETOTAIL; AVERAGE CONFIGURATION; SUPRATHERMAL H+; FLUX ROPES; SUBSTORMS; RE AB ISEE 3 magnetometer and electron plasma measurements from the 1983 Geotail Mission were surveyed to determine the magnetic and plasma properties of plasmoids and their evolution with distance downtail. Events were selected on the basis of a bipolar magnetic signature in either the geocentric solar magnetospheric B(z) and/or B(y) component; most had B(z) bipolar signatures. We found 366 events consistent with this signature while ISEE 3 was in the plasma sheet. ISEE 3 observed plasmoids all along its trajectory whenever it was in the plasma sheet. Plasmoids are characterized by high-speed plasma flow. Plasmoid length was determined using both the magnetometer and the electron plasma velocity data. We found the average length of plasmoids is 16.7 +/- 13.0 R(E), significantly smaller than previous estimates. Many plasmoids have a well-defined magnetic core field, characterized by a field strength maximum at the center of the pass through the structure. Plasmoids appear to be relatively stable structures once their formation process is complete. The size, velocity, magnetic core strength, and B(z) field amplitude of plasmoids do not depend on distance beyond 100 R(E) downtail. The average electron temperature inside plasmoids drops by a factor of 2 and the electron density increases by a factor of 2 as plasmoids propagate from near Earth distances (within 100 R(E) of the Earth) to the deep tail. We conclude that the stable size of the plasmoids, the density increase and the temperature decrease are consistent with a flux of cold electrons into the plasmoid. The strong correlation of interplanetary magnetic field B(y) an hour before the event with the strength and direction of B(y) observed inside plasmoids, the existence of events with the bipolar signature in both the B(y) and B(z) components, and the possible mass flux all are consistent with plasmoids being ''open'' magnetic structures. C1 BOSTON UNIV,CTR SPACE PHYS,BOSTON,MA 02215. RP MOLDWIN, MB (reprint author), LOS ALAMOS NATL LAB,SST-8 MS D438,LOS ALAMOS,NM 87545, USA. RI Moldwin, Mark/F-8785-2011 OI Moldwin, Mark/0000-0003-0954-1770 NR 60 TC 124 Z9 125 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1992 VL 97 IS A12 BP 19259 EP 19282 DI 10.1029/92JA01598 PG 24 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD128 UT WOS:A1992KD12800015 ER PT J AU LEMONS, DS WINSKE, D GARY, SP AF LEMONS, DS WINSKE, D GARY, SP TI ELECTROSTATIC ION-CYCLOTRON VELOCITY SHEAR INSTABILITY SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID KELVIN-HELMHOLTZ INSTABILITY; EXTERNAL MAGNETIC-FIELD; ELECTRIC-FIELD; MAGNETOSPHERIC BOUNDARY; TRANSVERSE; SIMULATION; PLASMA; WAVES; MAGNETOPAUSE; FLOWS AB An electrostatic ion cyclotron instability driven by sheared velocity flow perpendicular to a uniform magnetic field is investigated in the local approximation. The dispersion equation, which includes all kinetic effects and involves only one important parameter, is cast in the form of Gordeyev integrals and solved numerically. The instability occurs roughly at multiples of the ion cyclotron frequency (but modified by the shear) with the growth rate of the individual harmonics overlapping in wavenumber. At small values of the shear parameter, the instability exists in two branches, one at long wavelength, k(rhoi) approximately 0.5, and one at short wavelength, k(rhoi) > 1.5 (k(rhoi) is the wavenumber normalized to the ion gyroradius). At larger values of the shear parameter only the longer wavelength branch persists. The growth rate of the long wavelength mode, maximized over wavenumber and frequency, increases monotonically with the shear parameter. Properties of the instability are compared to those of Ganguli et al. (1985b, 1988b) obtained in the nonlocal limit. C1 BETHEL COLL,N NEWTON,KS 67117. RP LEMONS, DS (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 34 TC 7 Z9 7 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1992 VL 97 IS A12 BP 19381 EP 19387 DI 10.1029/92JA01735 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD128 UT WOS:A1992KD12800025 ER PT J AU MCKEAN, ME WINSKE, D GARY, SP AF MCKEAN, ME WINSKE, D GARY, SP TI MIRROR AND ION-CYCLOTRON ANISOTROPY INSTABILITIES IN THE MAGNETOSHEATH SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PERPENDICULAR BOW SHOCK; PLASMA DEPLETION LAYER; COLLISIONLESS SHOCKS; MACH NUMBER; WAVES; SIMULATION; DOWNSTREAM; BETA AB Magnetosheath plasmas are typically characterized by a proton beta > 1 and a proton temperature anisotropy T(perpendicluar-to)/T(parallel-to) > 1. Such a plasma is unstable to both the ion cyclotron anisotropy and mirror instabilities, and evidence for both of these growing modes has been found in the magnetosheath. In this paper, we use one-dimensional hybrid simulations to investigate the kinetic properties of these two instabilities. We find that, for moderate values of ion beta and temperature anisotropy, the two instabilities produce similar levels of turbulence, but that the cyclotron instability apparently produces higher fluctuation levels than the mirror instability for high beta or anisotropy. Although both instabilities saturate by reducing the ion temperature anisotropy, mirror waves accomplish this through the use of the wave magnetic fields, whereas cyclotron waves do so by using the wave electric fields in resonant interactions with the ions. Consequently, mirror waves preferentially affect those ions with large magnetic moment, while cyclotron waves affect a broader range of ions and thereby dominate the isotropization process even when the mirror mode is somewhat stronger. We also investigate the utility of transport ratios as mode identifiers, and find that the Alfven ratio in particular can be useful in distinguishing between the two modes. RP MCKEAN, ME (reprint author), LOS ALAMOS NATL LAB,MAIL STOP D438,LOS ALAMOS,NM 87545, USA. NR 33 TC 67 Z9 68 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD DEC 1 PY 1992 VL 97 IS A12 BP 19421 EP 19432 DI 10.1029/92JA01842 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD128 UT WOS:A1992KD12800029 ER PT J AU SADINSKI, WJ DUNSON, WA AF SADINSKI, WJ DUNSON, WA TI A MULTILEVEL STUDY OF EFFECTS OF LOW PH ON AMPHIBIANS OF TEMPORARY PONDS SO JOURNAL OF HERPETOLOGY LA English DT Article; Proceedings Paper CT SYMP ON AMPHIBIAN DECLINES AND HABITAT ACIDIFICATION, AT THE 1991 ANNUAL MEETING OF THE SOC FOR THE STUDY OF AMPHIBIANS AND REPTILES AND THE HERPETOLOGISTS LEAGUE CY AUG 08, 1991 CL UNIVERSITY PARK, PA SP SOC STUDY AMPHIBIANS & REPTILES, HEPETOLOGISTS LEAGUE ID ACID PRECIPITATION; AMBYSTOMA SALAMANDERS; EMBRYONIC MORTALITY; COMMUNITY ECOLOGY; LARVAL AMBYSTOMA; RANA-SYLVATICA; METAMORPHOSIS; POPULATION; DEPOSITION; MACULATUM AB Most researchers who have studied effects of low pH on amphibians that breed in temporary ponds measured direct lethal effects on single species. We summarize here results of a study conducted over 4 years in central Pennsylvania that illustrate the potential ecological importance of direct and indirect effects of low pH at lethal and sublethal levels. We argue for use of a multilevel approach (field sampling and experimentation in the laboratory, simulated ponds, and natural ponds) to study such effects on embryonic and larval amphibians of temporary ponds. A greater proportion of our study ponds was lower in pH than any reported previously in North America. Ponds were soft and often had high [Al(total)]. Median seasonal pHs of 9 ponds were negatively associated with total amounts of rainfall over 4 years, but were not associated with H+ deposition during that same period. The pHs of many ponds declined as total rainfall increased. Embryonic mortality of the salamander Ambystoma jeffersonianum was high in ponds below pH 4.5. Less pH-associated embryonic mortality was observed among the more tolerant salamander, Ambystoma maculatum, and frog, Rana sylvatica. Laboratory-determined LC50 values for hatching of R. sylvatica, A. maculatum, and A. jeffersonianum were 4.10, 4.31, and 4.51, respectively, and predicted embryonic mortalities in ponds with good accuracy. More larval R. sylvatica survived at pH 4.1 in the laboratory when initially contained with A. jeffersonianum than at pH >6. This was due to reduced survival of, and subsequent reduced predation by, A. jeffersonianum at pH 4.1. In the same experiment, survival of A. maculatum was not different between pHs as they were eaten by A. jeffersonianum at pH >6 and suffered pH-induced mortality at pH 4.1. More larval A. jeffersonianum survived at pH 4.1 over 7 days when larval R. sylvatica and A. maculatum were available as prey, than when no prey were available. Larval A. jeffersonianum did not survive to metamorphosis in pH 4.2, and survived in low numbers in pH >6, in simulated ponds. Ambystoma maculatum metamorphosed less often, took longer to metamorphose, and weighed less at metamorphosis in simulated ponds of pH 4.2 versus those of pH >6. Reproduction of the newt Notophthalmus viridescens in simulated ponds was significantly lower, and adults were trapped more often exiting ponds, in pH 4.2 than in pH >6. Presence of adult N. viridescens in simulated ponds resulted in significantly lower survival of R. sylvatica at metamorphosis; survival was not significantly affected by pH 4.2. Our results in simulated ponds were likely due to a combination of lethal and sublethal effects that impinged either directly on individual larvae, or indirectly via the food web. These results suggest that studies focused only on direct lethal effects of low pH could substantially underestimate total impacts of low pH on amphibians of temporary ponds. Thus, in addition to the pronounced direct lethal effects we observed on A. jeffersonianum, the chronic and intermittent fluctuations in pHs in our study ponds that were associated with total rainfall could conceivably have induced less obvious effects throughout the food webs. C1 PENN STATE UNIV,INTERCOLL GRAD PROGRAM ECOL,UNIV PK,PA 16802. PENN STATE UNIV,DEPT BIOL,UNIV PK,PA 16802. RP SADINSKI, WJ (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,70-193A,BERKELEY,CA 94720, USA. NR 47 TC 64 Z9 68 U1 0 U2 18 PU SOC STUDY AMPHIBIANS REPTILES PI OXFORD PA MIAMI UNIV, DEPT ZOOLOGY, OXFORD, OH 45056 SN 0022-1511 J9 J HERPETOL JI J. Herpetol. PD DEC PY 1992 VL 26 IS 4 BP 413 EP 422 DI 10.2307/1565117 PG 10 WC Zoology SC Zoology GA KD179 UT WOS:A1992KD17900008 ER PT J AU HISKEY, MA COBURN, MD MITCHELL, MA BENICEWICZ, BC AF HISKEY, MA COBURN, MD MITCHELL, MA BENICEWICZ, BC TI SYNTHESIS OF 3,3-DINITROAZETIDINE FROM 1-T-BUTYL-3,3-DINITROAZETIDINE SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article AB Treatment of 1-t-butyl-3,3-dinitroazetidine (1) with benzyl chloroformate resulted in a novel elimination of isobutylene to yield equimolar amounts of 1-(benzyloxycarbonyl)-3,3-dinitroazetidine (3) and 1-t-butyl-3,3-dinitroazetidine hydrochloride. The carbamate 3 was effectively cleaved by trifluoromethanesulfonic acid to yield 3,3-dinitroazetidinium trifluoromethanesulfonate (4). Free 3,3-dinitroazetidine (5) has also been isolated. RP HISKEY, MA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 4 TC 36 Z9 38 U1 1 U2 1 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 1855 EP 1856 PG 2 WC Chemistry, Organic SC Chemistry GA KH409 UT WOS:A1992KH40900030 ER PT J AU PIN, FG CULIOLI, JC AF PIN, FG CULIOLI, JC TI OPTIMAL POSITIONING OF COMBINED MOBILE PLATFORM-MANIPULATOR SYSTEMS FOR MATERIAL HANDLING TASKS SO JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS LA English DT Article DE MOBILE MANIPULATOR; COMBINED MOBILITY-MANIPULATION; REDUNDANCY RESOLUTION; REDUNDANT MANIPULATORS; OPTIMAL POSITIONING; MOBILE ROBOTS; MINIMAX; MATERIAL HANDLING ID OBSTACLE AVOIDANCE; REDUNDANT AB Mobile manipulators are attracting significant interest in the industrial, military, and public service communities because of the potential they provide for increased efficiency in material handling and manipulation tasks. Corresponding interest has arisen in the robotics research community since the combination and coordination of the mobility of an autonomous platform with the robotic motion of a manipulator introduce complex analytical problems. One such problem arises from the particular kinematic redundancy which characterizes practical mobile manipulators. This paper is concerned with a particular aspect of the resolution of this redundancy, which is its utilization to optimize the system's position and configuration during task commutations when changes occur in both task requirements and task constraints. Basic optimization schemes are developed for cases when load and position constraints are applied at the end-effector. Various optimization criteria are investigated for task requirements including obstacle avoidance, maneuverability and several torque functions. The problem of optimally positioning the platform for execution of a manipulation task requiring a given reach is also treated. Emphasis is then placed on the multi-criteria optimization methods which are necessary to calculate the commutation configurations in sequences of tasks with varying requirements. Sample results are presented for a system involving a three-link planar manipulator on a mobile platform. The various optimization schemes are discussed and compared, and several directions (in particular the novel use of minimax optimization pioneered here for redundancy resolution) are outlined for further extensions of the methods to the general problem of motion planning and control of redundant robotic systems with combined mobility and manipulation capabilities. RP PIN, FG (reprint author), OAK RIDGE NATL LAB,CTR ENGN SYST ADV RES,POB 2008,BLDG 6025,OAK RIDGE,TN 37831, USA. NR 29 TC 18 Z9 18 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0921-0296 J9 J INTELL ROBOT SYST JI J. Intell. Robot. Syst. PD DEC PY 1992 VL 6 IS 2-3 BP 165 EP 182 PG 18 WC Computer Science, Artificial Intelligence; Robotics SC Computer Science; Robotics GA KG233 UT WOS:A1992KG23300003 ER PT J AU RAINWATER, DL ANDRES, DW FORD, AL LOWE, WF BLANCHE, PJ KRAUSS, RM AF RAINWATER, DL ANDRES, DW FORD, AL LOWE, WF BLANCHE, PJ KRAUSS, RM TI PRODUCTION OF POLYACRYLAMIDE GRADIENT GELS FOR THE ELECTROPHORETIC RESOLUTION OF LIPOPROTEINS SO JOURNAL OF LIPID RESEARCH LA English DT Note DE GRADIENT GEL ELECTROPHORESIS; BABOON; VLDL; LDL; HDL ID INTERMEDIATE; SERUM AB We describe a protocol to cast nondenaturing polyacrylamide gradient gels (SFBR3/31) for the size resolution of lipoproteins. The protocol yields gels with minimal lot-to-lot variation in length and electrophoretic properties. Absorbance profiles of cholesterol-stained lipoproteins in baboon sera were used to estimate the relative amounts of stain in four lipoprotein size classes (VLDL+LDL, HDL1, HDL2, and HDL3). When compared with gels from a commercial source, the SFBR3/31 gels gave very similar results in terms of precision (coefficients of variation) and of estimated amounts of lipoproteins in the four size classes. In other studies, we estimated peak diameters of protein-stained human lipoproteins after calibrating the gels with size standards. Peak diameters estimated using SFBR3/31 gels were highly correlated (r2 = 0.99, n = 33) with those estimated using gels from a commercial source. We conclude that the protocol reliably produces gradient gels that are suitable for the analysis of lipoprotein phenotypes. C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. RP RAINWATER, DL (reprint author), SW FDN BIOMED RES,DEPT GENET,SAN ANTONIO,TX 78228, USA. FU NHLBI NIH HHS [HL28972, HL18574, HL45522] NR 7 TC 92 Z9 94 U1 0 U2 0 PU LIPID RESEARCH INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0022-2275 J9 J LIPID RES JI J. Lipid Res. PD DEC PY 1992 VL 33 IS 12 BP 1876 EP 1881 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KD199 UT WOS:A1992KD19900016 PM 1479297 ER PT J AU FULLERTON, EE MATTSON, JE LEE, SR SOWERS, CH HUANG, YY FELCHER, G BADER, SD PARKER, FT AF FULLERTON, EE MATTSON, JE LEE, SR SOWERS, CH HUANG, YY FELCHER, G BADER, SD PARKER, FT TI NONOSCILLATORY ANTIFERROMAGNETIC COUPLING IN SPUTTERED FE/SI SUPERLATTICES SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Letter ID MAGNETIC MULTILAYERS; SI MULTILAYERS; EXCHANGE; LAYERS; PERIOD AB A series of sputtered Fe(30 angstrom)/Si(x) superlattices were grown for x = 10-40 angstrom. Magnetization and Kerr hysteresis loops, and neutron-reflectivity measurements identify antiferromagnetic (AF) coupling of the Fe layers at room temperature for x = 15 angstrom nominal thickness, with switching fields of 6 kOe. X-rav structural analyses indicate that the spacer medium is crystalline for k < 20 angstrom, while sputtered Si is amorphous (a). Failure to detect oscillations in the AF coupling for thicker Si layers is due to the formation of a-Si, as opposed to the crystalline silicide responsible for the coupling. C1 UNIV CALIF SAN DIEGO,CTR MAGNET RECORDING RES 0401,LA JOLLA,CA 92093. RP FULLERTON, EE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AVE,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 26 TC 125 Z9 127 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD DEC PY 1992 VL 117 IS 3 BP L301 EP L306 DI 10.1016/0304-8853(92)90084-2 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KE888 UT WOS:A1992KE88800001 ER PT J AU WANG, YL TAN, ZQ ZHU, YM MOODENBAUGH, AR SUENAGA, M AF WANG, YL TAN, ZQ ZHU, YM MOODENBAUGH, AR SUENAGA, M TI SYNTHESIS OF YBA2CU3O7-DELTA WITH CLEAN GRAIN-BOUNDARIES BY A MODIFIED AEROSOL DECOMPOSITION PROCESS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CERAMIC SUPERCONDUCTORS; CRITICAL CURRENTS; WEAK-LINK; POWDER; PHASE; MICROSTRUCTURE; SPECTROSCOPY; PYROLYSIS; REACTOR; OXIDES AB A modified aerosol decomposition method was developed for producing sintered YBa2Cu3O7-delta (1-2-3) pellets having sharp superconducting transition T(c)'s at approximately 90 K, fine grain sizes, and clean grain boundaries. This method used "precursor" powders, which were produced with an aerosol flow reactor at 550-degrees-C, instead of in situ produced 1-2-3 powders commonly processed at 880-1000-degrees-C. As determined by x-ray absorption and powder diffraction studies, the 1-2-3 powders produced by the modified route contain less cation disorders than the in situ produced powders. The disorder is speculated to be the cause of T(c)-suppression and broadening. It cannot be removed unless high sintering temperatures were used (>950-degrees-C), which resulted in large grains and impurities and cracks at grain boundaries. RP WANG, YL (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. OI Moodenbaugh, Arnold/0000-0002-3415-6762 NR 45 TC 10 Z9 10 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 3175 EP 3184 DI 10.1557/JMR.1992.3175 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA KB464 UT WOS:A1992KB46400002 ER PT J AU ZEUCH, DH MONTGOMERY, ST KECK, JD AF ZEUCH, DH MONTGOMERY, ST KECK, JD TI HYDROSTATIC AND TRIAXIAL COMPRESSION EXPERIMENTS ON UNPOLLED PZT 95/5-2NB CERAMIC - THE EFFECTS OF SHEAR-STRESS ON THE FR1-]AO POLYMORPHIC PHASE-TRANSFORMATION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID LEAD ZIRCONATE-TITANATE; SOLID-SOLUTION SYSTEM; THERMODYNAMIC THEORY; TEMPERATURES; TRANSITION AB We conducted a series of hydrostatic and constant shear stress experiments at room temperature on three different sintering runs of unpoled, niobium-doped lead-zirconate-titanate ceramic (PZT 95/5-2Nb) in order to quantify the influence of shear stress on the displacive (possibly martensitic), first-order, rhombohedral --> orthorhombic phase transformation. Inter- and intra-batch variations were detected, but some generalizations can be made. In hydrostatic compression at room temperature, the transformation began at approximately 260 MPa, and was usually incompletely reversed upon return to ambient conditions. Strains associated with the transformation were isotropic, both on the first and subsequent hydrostatic cycles. Results for the constant shear stress tests were very different. First, the confining pressure and mean stress at which the transition begins decreased systematically with increasing shear stress. Second, we observed that the rate of transformation decreased with increasing shear stress and the associated elastic shear strain. This result contrasts with the typical observation that shear stresses increase reaction and transformation kinetics. Third, strain was not isotropic during the transformation: axial strains were greater and lateral strains smaller than for the hydrostatic case, though volumetric strain behavior was comparable for the two types of tests. However, this effect does not appear to be an example of transformational plasticity: no additional unexpected strains accumulated during subsequent cycles through the transition under deviatoric loading. If subsequent hydrostatic cycles were performed on samples previously subjected to shear stress, strain anisotropy was again observed, indicating that the earlier superimposed shear stress produced a permanent mechanical anisotropy in the material. The mechanical anisotropy probably resulted from a crystallographic preferred orientation that developed during the transformation under shear stress. Finally, in a few experiments on specimens from one particular sintering run, volume strain was often completely recovered and sporadic evidence for a shape memory effect was observed. RP ZEUCH, DH (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 45 TC 12 Z9 12 U1 1 U2 4 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 3314 EP 3332 DI 10.1557/JMR.1992.3314 PG 19 WC Materials Science, Multidisciplinary SC Materials Science GA KB464 UT WOS:A1992KB46400018 ER PT J AU KUNG, PJ MCHENRY, M MALEY, M COULTER, Y PETERSON, D AF KUNG, PJ MCHENRY, M MALEY, M COULTER, Y PETERSON, D TI ENHANCED CRITICAL MAGNETIZATION CURRENTS OF HOT-PRESSED YBA2CU3O6+X THROUGH PARTIAL MELTING POST-OXYGENATION SO JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS LA English DT Article ID BA-CU-O; SUPERCONDUCTING PROPERTIES; YBA2CU3O7-DELTA; BA2YCU3OX AB Bulk YBa2Cu3O6+x superconductor was synthesized using the hot-pressing technique combined with various oxygen-annealing cycles. Pressed samples, with their ab-planes perpendicular to the pressing axis, annealed in oxygen at the partial melting point of approximately 1000-degrees-C and slowly cooled at different rates in the temperature ranges 975-935 and 935-450-degrees-C showed enhanced magnetization hysteresis loops with a weak field dependence. Due to oxygen-deficient regions in these materials, anomalous magnetization hysteresis loops with a "butterfly" contour were observed at temperatures above 50 K. This indicates that these regions act as effective flux-pinning centres at high temperatures. The critical magnetization current density (J(c)) calculated using the Bean model and the average grain dimension was of the order of 10(4) A cm-2 at 75 K up to 1 T. Because of a shorter period of oxygenation and a weak field dependence of J(c) s, the synthesis process reported here is very promising and further optimization of the period in various annealing temperature ranges to limit the weak links caused by excessive grain growth becomes necessary. The observations are also correlated with the morphology and the crystal orientation studied by scanning electron microscopy and X-ray diffractometry, respectively. C1 CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213. RP KUNG, PJ (reprint author), LOS ALAMOS NATL LAB,CTR EXPLORATORY RES & DEV,LOS ALAMOS,NM 87545, USA. RI McHenry, Michael/B-8936-2009 NR 13 TC 2 Z9 2 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0957-4522 J9 J MATER SCI-MATER EL JI J. Mater. Sci.-Mater. Electron. PD DEC PY 1992 VL 3 IS 4 BP 244 EP 248 DI 10.1007/BF00703035 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Engineering; Materials Science; Physics GA KD362 UT WOS:A1992KD36200010 ER PT J AU THOMAS, IM PAYNE, SA WILKE, GD AF THOMAS, IM PAYNE, SA WILKE, GD TI OPTICAL-PROPERTIES AND LASER DEMONSTRATION OF ND-DOPED SOL-GEL SILICA GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID STATE; FLUORESCENCE; ALUMINUM; HOSTS; GAIN AB Nd-doped sol-gel silica glasses possessing optical quality that was adequate for a simple demonstration of laser action have been prepared, The highest quantum yield and longest emission lifetime obtained were 55% and 425 mus, respectively, for an Nd doping level of 0.36 x 10(20) cm-3. The optical scattering loss was found to be on the order of 4.5%/cm. The sol-gel samples were prepared using a novel combination of techniques, including, for example, the employment of a particulate silica filler material to ensure crack-free drying, and the addition of propylene oxide to reduce the gelation time. C1 LAWRENCE LIVERMORE NATL LAB,POB 5508,L-490,LIVERMORE,CA 94550. NR 29 TC 123 Z9 125 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1992 VL 151 IS 3 BP 183 EP 194 DI 10.1016/0022-3093(92)90028-I PG 12 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA KG307 UT WOS:A1992KG30700001 ER PT J AU OLSEN, CE ANDREW, JF AF OLSEN, CE ANDREW, JF TI PURE PLUTONIUM BEHAVIOR UNDER NEGATIVE PRESSURES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Dilatometry curves on plutonium show reproducible hysteresis on heating and cooling. Simultaneous electrical resistivity and dilatometric measurements together with the pressure-temperature phase diagram extrapolated to negative pressures provide an understanding for the differences between the heating and cooling curves. Using the extrapolated pressure-temperature phase diagram, this study shows that the internal stresses produced in temperature cycling are much larger than previously thought and that negative pressures (tension) play a significant role in the behavior of plutonium metal. RP OLSEN, CE (reprint author), LOS ALAMOS NATL LAB,NMT-5,MS E506,LOS ALAMOS,NM 87545, USA. NR 19 TC 2 Z9 2 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 199 IS 1 BP 6 EP 11 DI 10.1016/0022-3115(92)90434-M PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KH234 UT WOS:A1992KH23400002 ER PT J AU STRACHAN, JD BELL, M JANOS, A KAYE, S KILPATRICK, S MANOS, D MANSFIELD, D MUELLER, D OWENS, K PITCHER, CS SNIPES, J TIMBERLAKE, J AF STRACHAN, JD BELL, M JANOS, A KAYE, S KILPATRICK, S MANOS, D MANSFIELD, D MUELLER, D OWENS, K PITCHER, CS SNIPES, J TIMBERLAKE, J TI EXPERIMENTS ON TFTR SUPERSHOT PLASMAS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID TOKAMAKS AB Improvements to the TFTR limiter have extended the threshold for carbon blooms (an uncontrolled massive influx of carbon) to greater than 32 MW for 1 s so that blooms seldom occur in present TFTR supershot experiments. As a result of the progression from strong blooms to modest blooms to no blooms, improvements in confinement could be correlated with the occurrence of a carbon bloom in the plasma which immediately preceded the supershot. It is speculated that the carbon influx during a carbon bloom results in a limiter surface which has a slightly reduced self-sputtering yield for the subsequent discharge. The influence on the supershot plasma seems similar to phenomena obtained by conditioning with lithium pellets. C1 CANADIAN FUS FUELS TECHNOL PROJECT,TORONTO,ON,CANADA. MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP STRACHAN, JD (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 20 TC 21 Z9 21 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 28 EP 34 DI 10.1016/S0022-3115(06)80008-5 PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000005 ER PT J AU HILLIS, DL HOGAN, JT FINKEN, KH WEST, WP WEYNANTS, RR WADE, MR AKAISHI, K BAEK, WY BOEDO, J BURRELL, KH CONN, RW DIPPEL, KH DOERNER, R EURINGER, H FINKENTHAL, D GRAY, DS GREENFIELD, CM GOHIL, P GROEBNER, RJ KIM, J KLEPPER, CC MESSIAEN, AM MIODUSZEWSKI, PK MIYAHARA, A MOYER, R VANOOST, G POSPIESZCZYK, A REITER, D RUSBULDT, D SERAYDARIAN, RP VANNIEUWENHOVE, R WOLF, GH AF HILLIS, DL HOGAN, JT FINKEN, KH WEST, WP WEYNANTS, RR WADE, MR AKAISHI, K BAEK, WY BOEDO, J BURRELL, KH CONN, RW DIPPEL, KH DOERNER, R EURINGER, H FINKENTHAL, D GRAY, DS GREENFIELD, CM GOHIL, P GROEBNER, RJ KIM, J KLEPPER, CC MESSIAEN, AM MIODUSZEWSKI, PK MIYAHARA, A MOYER, R VANOOST, G POSPIESZCZYK, A REITER, D RUSBULDT, D SERAYDARIAN, RP VANNIEUWENHOVE, R WOLF, GH TI HELIUM TRANSPORT IN ENHANCED CONFINEMENT REGIMES ON THE TEXTOR AND DIII-D TOKAMAKS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID EXCHANGE RECOMBINATION SPECTROSCOPY; II PUMP LIMITER; EXHAUST AB Comparisons of helium (He) transport and exhaust in L-mode and in an enhanced confinement regime (H-mode), which is induced by a polarizing electrode, have been made for the TEXTOR tokamak. The results show an increased tendency for He accumulation when bulk plasma energy and particle confinement are improved during the polarization-induced H-mode. Since these results imply that a high He pumping efficiency may be necessary for H-mode burning plasmas, we have begun exploring He transport in a divertor H-mode, similar to that proposed for the international thermonuclear experimental reactor (ITER). A collaborative program has been initiated to measure He transport and scaling on DIII-D during L-mode, H-mode, and ELMing H-mode plasma conditions. To simulate the presence of He ash in DIII-D, a 25 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of almost-equal-to 5%. The time dependence of the He-2+ density profiles in the plasma core is measured by charge-exchange recombination spectroscopy at 11 radial locations. C1 FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM JULICH, ASSOC EURATOM, INST PLASMAPHYS, W-5170 JULICH 1, GERMANY. GEN ATOM CO, SAN DIEGO, CA 92138 USA. EURATOM, PLASMAFYS LAB, BRUSSELS, BELGIUM. ECOLE ROYALE MIL, ASSOC EURATOM BELGISCHE STAAT, B-1040 BRUSSELS, BELGIUM. OAK RIDGE ASSOCIATED UNIV, OAK RIDGE, TN 37830 USA. NATL INST FUS SCI, NAGOYA, JAPAN. EURATOM, LAB PLASMAFYS, BRUSSELS, BELGIUM. UNIV CALIF LOS ANGELES, INST PLASMA & FUS RES, LOS ANGELES, CA 90024 USA. KONINKLIJKE MIL SCH, BRUSSELS, BELGIUM. UNIV CALIF BERKELEY, DEPT NUCL ENGN, BERKELEY, CA 94720 USA. RP HILLIS, DL (reprint author), OAK RIDGE NATL LAB, DIV FUS ENERGY, OAK RIDGE, TN 37830 USA. NR 20 TC 19 Z9 19 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 35 EP 44 DI 10.1016/S0022-3115(06)80009-7 PG 10 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000006 ER PT J AU COHEN, SA WERLEY, KA HARRISON, MFA PISTUNOVITCH, V KUKUSHKIN, A KRASHENNINIKOV, S SUGIHARA, M PERKINS, LJ BULMER, R POST, DE WESLEY, J AF COHEN, SA WERLEY, KA HARRISON, MFA PISTUNOVITCH, V KUKUSHKIN, A KRASHENNINIKOV, S SUGIHARA, M PERKINS, LJ BULMER, R POST, DE WESLEY, J TI THE STATUS OF ITER DIVERTOR DESIGN CONCEPTS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PLASMAS; REGION AB The divertor and SOL plasma parameters predicted for the ITER double-null reference configuration are reviewed with emphasis on model uncertainties and peaking factors. Predicted divertor performance is reported for two alternate ITER magnetic configurations, a high-aspect-ratio and a single-null design, both proposed to remedy divertor heat load and erosion problems. Physical processes and fluid-plasma numerical simulations of a divertor plasma operating near the gaseous neutralization phase transition are described. RP COHEN, SA (reprint author), PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Post, Douglass/L-3773-2014 OI Post, Douglass/0000-0001-9271-0023 NR 39 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 50 EP 58 DI 10.1016/S0022-3115(06)80011-5 PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000008 ER PT J AU CUTHBERTSON, JW LANGER, WD MOTLEY, RW AF CUTHBERTSON, JW LANGER, WD MOTLEY, RW TI REFLECTION OF LOW-ENERGY PLASMA IONS FROM METAL-SURFACES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID ANGULAR-DISTRIBUTIONS; HYDROGEN; SCATTERING AB Reflection of low energy (< 100 eV) ions from surfaces plays an important role in areas of plasma technology such as in the edge region of fusion devices. We have developed a beam source based on acceleration and reflection of ions from a magnetically confined coaxial rf plasma source. The beam provides a large enough ion flux (over 4 A) to allow the characteristics of the reflected neutrals to be measured despite the inefficiency of detection. The energy distributions are measured by means of an electrostatic cylindrical mirror analyzer coupled with a quadrupole mass spectrometer. Energy distributions have been measured for oxygen, nitrogen and inert gas ions incident with from 10 to 70 eV reflected from amorphous metal surfaces of several compositions. The characteristics of particle reflection are commonly predicted in plasma modelling by use of simulation codes based on data from much higher incident energies. Measurements on this beam source allow the assumptions and approximations used in such codes to be tested. The predictions of the widely used TRIM code are compared to measured reflected energy distributions at low incident energies; significant differences are observed, particularly for lower target/projectile atomic mass ratios. The adequacy of the sequential binary collision approximation (used by TRIM) for modelling a collision process which at low energies is actually a simultaneous interaction between several atoms is tested by comparison with n-body trajectory calculations. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. NR 23 TC 29 Z9 30 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 113 EP 128 DI 10.1016/S0022-3115(06)80017-6 PG 16 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000014 ER PT J AU BUCHENAUER, D CUTHBERTSON, JW HILL, DN KLEPPER, C PETRIE, TW AF BUCHENAUER, D CUTHBERTSON, JW HILL, DN KLEPPER, C PETRIE, TW TI POWER SCALING OF DIVERTOR PLASMA CONDITIONS DURING H-MODE IN DIII-D SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB An array of fixed Langmuir probes spanning the inner and outer divertor strike points has been used to measure the electron temperature, plasma density, and particle/heat flux profiles of the divertor plasma in DIII-D. We report here on observations made during the steady state phase of high-power neutral-beam heated H-mode plasmas. These data are important for predicting the expected impurity sources and target plate material lifetimes in future high power tokamaks such as ITER. H-mode plasmas formed with a high divertor neutral pressure in the absence of external gas feed in DIII-D were found to have beneficial consequences in reducing the peak values of divertor electron temperature without loss of core energy confinement. We have observed a steady state, high density (n(pl,d) almost-equal-to 10(14) cm-3), moderate temperature (< 50 eV) divertor plasma in DIII-D at divertor power levels of 3 MW/m2. A better understanding of the importance of collisional effects may be needed to interpret these results. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. GEN ATOM,SAN DIEGO,CA 92121. RP BUCHENAUER, D (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 14 TC 15 Z9 15 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 133 EP 138 DI 10.1016/S0022-3115(06)80019-X PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000016 ER PT J AU HIROOKA, Y BOURHAM, M BROOKS, JN CAUSEY, RA CHEVALIER, G CONN, RW EDDY, WH GILLIGAN, J KHANDAGLE, M RA, Y AF HIROOKA, Y BOURHAM, M BROOKS, JN CAUSEY, RA CHEVALIER, G CONN, RW EDDY, WH GILLIGAN, J KHANDAGLE, M RA, Y TI EVALUATION OF TUNGSTEN AS A PLASMA-FACING MATERIAL FOR STEADY-STATE MAGNETIC FUSION DEVICES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID BULK-BORONIZED GRAPHITES; PISCES-B; EROSION; BOMBARDMENT; FACILITY; DIVERTOR; HYDROGEN AB Tungsten in the form of bulk-material, and relatively thick (1 mm) chemically deposited and plasma-sprayed coatings on molybdenum, has been evaluated as a plasma-facing material for near future steady state magnetic fusion devices, focusing on issues related to the divertor plate design. These issues are: (1) thermal outgassing; (2) plasma erosion; (3) deuterium retention; (4) disruption erosion; and (5) surface modifications. Total outgassing quantities from bulk tungsten and chemically deposited coatings are substantially smaller than those from graphites. Effects of redeposition and impurities on the erosion behavior due to deuterium plasma bombardment have been analyzed. Trace amounts of oxygen-containing impurities in the plasma can reduce the threshold energy for physical sputtering, affecting the overall erosion behavior of tungsten at energies below 500 eV. However, it has been found that at electron temperatures around 5 eV or lower, fragmentation of these impurities followed by positive ionization is significantly reduced, whereby plasma erosion data basically agree with sputtering theories and ion beam data. Thermal desorption measurements after plasma bombardment have indicated that the deuterium retention quantity in tungsten materials is of the order of 10(14-15) D atoms/cm2. At simulated disruption with an energy deposition of 6 MJ/m2, the effective heat deposition is found to be reduced to about 1%, due to a combined effect of molten layer protection and vapor shielding. Steady state plasma bombardment removes surface impurities and smooths the surface topography along with surface erosion whereas disruption causes microscopic cracking and surface melting. C1 N CAROLINA STATE UNIV,DEPT NUCL ENGN,RALEIGH,NC 27695. SANDIA NATL LABS,DIV FUS RES,LIVERMORE,CA 94550. ARGONNE NATL LAB,FUS POWER PROGRAM,ARGONNE,IL 60439. RP HIROOKA, Y (reprint author), UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024, USA. NR 34 TC 31 Z9 31 U1 2 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 149 EP 158 DI 10.1016/S0022-3115(06)80022-X PG 10 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000019 ER PT J AU HILL, DN FUTCH, A LEONARD, AW MAHDAVI, MA PETRIE, TW BUCHENAUER, D CAMPBELL, R CUTHBERTSON, JW WATKINS, J MOYER, R AF HILL, DN FUTCH, A LEONARD, AW MAHDAVI, MA PETRIE, TW BUCHENAUER, D CAMPBELL, R CUTHBERTSON, JW WATKINS, J MOYER, R TI THE EFFECT OF ELMS ON EDGE PLASMA SCALING IN DIII-D SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID POLOIDAL DIVERTOR; TOKAMAK REACTOR; JT-60 AB In this paper we report results of scaling studies aimed at determining how the divertor conditions vary with plasma current, toroidal field, and neutral beam heating power in H-mode discharges with ELMs in the DIII-D tokamak. We find that ELMs produce relatively more direct particle losses (50% or more of the total) than energy losses (less-than-or-equal-to 20%). The time-average peak divertor heat flux in these plasmas is found to scale as q(d) is-proportional-to (P(NBI)I(p))(B(p,mp/B(p,div). The linear power dependence suggests that the plasma sheath at the targets is primarily responsible for limiting the parallel energy flow, while the I(p) variation may mean that the radial energy transport in the SOL decreases with increasing plasma current, just as it does in the core. C1 GEN ATOM CO,SAN DIEGO,CA 92138. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,LIVERMORE,CA 94550. UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT MECH AEROSP & NUCL ENGN,LOS ANGELES,CA 90024. RP HILL, DN (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 22 TC 28 Z9 28 U1 1 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 204 EP 209 DI 10.1016/S0022-3115(06)80032-2 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000029 ER PT J AU PITCHER, CS STANGEBY, PC BELL, MG ELDER, JD KILPATRICK, SJ MANOS, DM MEDLEY, SS OWENS, DK RAMSEY, AT ULRICKSON, M AF PITCHER, CS STANGEBY, PC BELL, MG ELDER, JD KILPATRICK, SJ MANOS, DM MEDLEY, SS OWENS, DK RAMSEY, AT ULRICKSON, M TI PLASMA FLUXES TO SURFACES FOR AN OBLIQUE MAGNETIC-FIELD SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID TFTR; TRANSPORT; LIMITER AB The poloidal and toroidal spatial distributions of D(alpha), HeI and CII emission have been obtained in the vicinity of the TFTR bumper limiter and are compared with models of ion flow to the surface. The distributions are found not to agree with a model (the ''cosine'' model) which determines the incident flux density using only the parallel fluxes in the scrape-off layer and the projected area of the surface perpendicular to the field lines. In particular, the cosine model is not able to explain the significant fluxes observed at locations on the surface which are oblique to the magnetic field. It is further shown that these fluxes cannot be explained by the finite Larmor radii of impinging ions. Finally, it is demonstrated, with the use of Monte Carlo codes, that the distributions can be explained by including both parallel and cross-field transport onto the limiter surface. C1 CANADIAN FUS FUELS TECHNOL PROJECT,TORONTO,ON,CANADA. UNIV TORONTO,TORONTO M5S 1A1,ONTARIO,CANADA. RP PITCHER, CS (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. NR 16 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 241 EP 247 DI 10.1016/S0022-3115(06)80039-5 PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000036 ER PT J AU TSUI, HYW MANOS, DM RUDYJ, A RITZ, CP WOOTTON, AJ AF TSUI, HYW MANOS, DM RUDYJ, A RITZ, CP WOOTTON, AJ TI EDGE PLASMA AND FLUCTUATIONS IN TFTR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID TURBULENCE; TRANSPORT; TOKAMAKS AB Edge fluctuations and their associated transport have been measured in TFTR with a fast reciprocating drive shaft fitted with a Langmuir probe array specially designed to withstand high power density and to provide spatial resolution required for fluctuation measurements. Simultaneous measurements of plasma potential, electron temperature and density in the scrape-off layer (SOL) and in the edge region just inside the last-closed flux surface (LCFS) were obtained to characterize the edge fluctuations in ohmic discharges. Significant changes in the properties of the fluctuations in the SOL were observed in both Supershot and H-mode plasmas. C1 UNIV TEXAS,FUS RES CTR,AUSTIN,TX 78712. MAX PLANCK INST PLASMA PHYS,W-8046 GARCHING,GERMANY. RP TSUI, HYW (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 16 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 292 EP 295 DI 10.1016/S0022-3115(06)80048-6 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000045 ER PT J AU UCKAN, T ACETO, SC BAYLOR, LR BELL, JD BIGELOW, TS ENGLAND, AC HARRIS, JH ISLER, RC JERNIGAN, TC LYON, JF MA, CH MIODUSZEWSKI, PK MURAKAMI, M RASMUSSEN, DA WILGEN, JB ZIELINSKI, JJ AF UCKAN, T ACETO, SC BAYLOR, LR BELL, JD BIGELOW, TS ENGLAND, AC HARRIS, JH ISLER, RC JERNIGAN, TC LYON, JF MA, CH MIODUSZEWSKI, PK MURAKAMI, M RASMUSSEN, DA WILGEN, JB ZIELINSKI, JJ TI EFFECTS OF LIMITER BIASING ON THE ATF TORSATRON SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID ADVANCED TOROIDAL FACILITY; PLASMA; TURBULENCE AB Positive limiter biasing on the currentless ATF torsatron produces a significant increase in the particle confinement with no improvement in the energy confinement. Experiments have been carried out in 1-T plasmas with approximately 400 kW of ECH. Two rail limiters located at the last closed flux surface (LCFS), one at the top and one at the bottom of the device, are biased at positive and negative potentials with respect to the vessel. When the limiters are positively biased at up to 300 V, the density increases sharply to the ECH cutoff value. At the same time, the H(alpha) radiation drops, indicating that the particle confinement improves. When the density is kept constant, the H(alpha) radiation is further reduced and there is almost no change of plasma stored energy. Under these conditions, the density profiles become peaked and the electric field becomes outward-pointing outside the LCFS and more negative inside the LCFS. In contrast, negative biasing yields some reduction of the density and stored energy at constant gas feed, and the plasma potential profile remains the same. Biasing has almost no effect on the intrinsic impurity levels in the plasma. C1 RENSSELAER POLYTECH INST,TROY,NY 12181. RP UCKAN, T (reprint author), OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37831, USA. OI Isler, Ralph/0000-0002-5368-7200 NR 13 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 308 EP 311 DI 10.1016/S0022-3115(06)80051-6 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000048 ER PT J AU ROGNLIEN, TD MILOVICH, JL RENSINK, ME PORTER, GD AF ROGNLIEN, TD MILOVICH, JL RENSINK, ME PORTER, GD TI A FULLY IMPLICIT, TIME-DEPENDENT 2-D FLUID CODE FOR MODELING TOKAMAK EDGE PLASMAS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID SCRAPE-OFF PLASMA; LAYER; LIMITER AB A fully implicit, time dependent 2-D fluid code is described that models the edge plasma region of a tokamak with a divertor or limiter. Equations solved are for particle continuity, parallel momentum, electron energy, ion energy, electrostatic potential, and neutral gas diffusion. We include the effects of parallel currents and cross-field drifts so that divertor biasing can be investigated. The core plasma is poloidally periodic, and the inner and outer private flux regions are properly connected. An implicit method-of-lines scheme is used to advance the variables in time utilizing the Krylov technique which does not require explicit formation or solution of the Jacobian matrix. However, for good performance, the problem needs to be preconditioned; a numerically generated Jacobian is used for this stage. The Jacobian can also be used to obtain the steady state solution by standard Newton iteration. Results are presented on the effects of biasing and parallel currents for DIII-D single-null parameters, and showing the time dependent heat flux on the divertor plate. RP ROGNLIEN, TD (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 18 TC 184 Z9 185 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 347 EP 351 DI 10.1016/S0022-3115(06)80058-9 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000055 ER PT J AU KNOLL, DA MCHUGH, PR AF KNOLL, DA MCHUGH, PR TI NEWEDGE - A 2D FULLY IMPLICIT EDGE PLASMA FLUID CODE FOR ADVANCED PHYSICS AND COMPLEX GEOMETRIES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID LINEAR-SYSTEMS; MATRIX AB The solution algorithm of the 2D fully implicit edge plasma fluid code NEWEDGE has been significantly advanced. An efficient numerical Jacobian evaluation has been implemented, and an advanced iterative matrix algorithm has replaced the previously used banded Gaussian elimination. These advancements allow a memory and CPU efficient, robust solution on a fine grid for a single null, multiply connected geometry. The algorithm advancements are discussed and a model problem is used to demonstrate the code's performance. RP KNOLL, DA (reprint author), IDAHO NATL ENGN LAB,COMP FLUID DYNAM UNIT,IDAHO FALLS,ID 83415, USA. NR 12 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 352 EP 356 DI 10.1016/S0022-3115(06)80059-0 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000056 ER PT J AU PROCASSINI, RJ KNOLL, DA AF PROCASSINI, RJ KNOLL, DA TI KINETICALLY MOTIVATED BOUNDARY-CONDITIONS FOR FLUID MODELS OF SCRAPE-OFF LAYER TRANSPORT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PLASMA; SHEATH; COLLISIONLESS AB A kinetic model of scrape-off layer (SOL) transport has been developed which can provide hydrodynamic SOL transport models with suitable values of boundary conditions (BCs) which are applied as plasma-surface interfaces. The model combines standard particle-in-cell and Monte Carlo collisional methods into a single package. This particle code is capable of modeling transport in a self-consistent electrostatic potential in a single spatial dimension, along the open magnetic field lines in the SOL, with velocity components parallel and perpendicular to the field lines. The code has been used to model SOL transport over a wide range charged-neutral collisionality, for a fixed level of Coulomb collisionality. These simulations have produced predictions of the plasma-sheath BCs as a function of SOL collisionality. The effect of varying these BCs on the results obtained from a two-dimensional fluid code is discussed for a simplified diverted SOL geometry. C1 IDAHO NATL ENGN LAB,COMP FLUID DYNAM UNIT,IDAHO FALLS,ID 83415. RP PROCASSINI, RJ (reprint author), LAWRENCE LIVERMORE NATL LAB,INERTIAL CONFINEMENT FUS PROGRAM,LIVERMORE,CA 94550, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 363 EP 368 DI 10.1016/S0022-3115(06)80061-9 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000058 ER PT J AU CAMPBELL, RB PETRIE, TW HILL, DN AF CAMPBELL, RB PETRIE, TW HILL, DN TI SCRAPE-OFF LAYER MODELING OF RADIATIVE DIVERTOR AND HIGH HEAT-FLUX EXPERIMENTS ON DIII-D SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PLASMA; TRANSPORT AB We use a new multispecies 1D fluid code, NEWT-ID, to model DIII-D scrape-off layer (SOL) behavior during radiative divertor and high heat flux experiments. The separatrix location and the width of the SOL are uncertain, and affect the comparison of the data in important ways. The model agrees with many of the experimental measurements for a particular prescription for the separatrix location. The model cannot explain the recent data on the separatrix T(i) with a conventional picture of ion and electron power flows across the separatrix. Radial transport of particles and heat in some form is required to explain the peak heat flux data before and after gas puffing. For argon puffing in the private flux region, entrainment is poor in the steady state. The calculations suggest that strike point argon puffing in a slot divertor geometry results in substantially better entrainment. Self-consistent, steady-state solutions with radiated powers up to 80% of the SOL power input are obtained in 1D. We discuss significant radial effects which warrant the development of a code which can treat strongly radiating impurities in 2D geometries. C1 GEN ATOM CO,SAN DIEGO,CA 92138. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP CAMPBELL, RB (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 426 EP 430 DI 10.1016/S0022-3115(06)80072-3 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000069 ER PT J AU BUDNY, RV COSTER, D STOTLER, D BELL, MG JANOS, AC OWENS, DK AF BUDNY, RV COSTER, D STOTLER, D BELL, MG JANOS, AC OWENS, DK TI PARTICLE BALANCE IN A TFTR SUPERSHOT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PLASMAS; CONFINEMENT; TOKAMAK; LIMITER AB Particle balance has been studied self-consistently for a TFTR supershot during a relatively steady-state phase of the neutral beam injection. The TRANSP analysis code was used to model plasma parameters within the last closed flux surface, deriving time-dependent plasma profiles from measurements. The poloidal flux surfaces were obtained from TRANSP and an equivalent-filament analysis code. The edge plasma and recycling were modeled using the combined B2/DEGAS code with boundary conditions from the TRANSP modeling. The edge and scrape-off modeling results are compared with measurements of the D(alpha) emission and temperature increases in the inner limiter. RP BUDNY, RV (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08543, USA. RI Coster, David/B-4311-2010; Stotler, Daren/J-9494-2015 OI Coster, David/0000-0002-2470-9706; Stotler, Daren/0000-0001-5521-8718 NR 14 TC 13 Z9 13 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 462 EP 465 DI 10.1016/S0022-3115(06)80079-6 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000076 ER PT J AU PAUL, SF FONCK, RJ ISLER, RC SESNIC, S AF PAUL, SF FONCK, RJ ISLER, RC SESNIC, S TI IMPURITY BEHAVIOR IN HIGH-BETA PLASMAS IN PBX-M SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID TOKAMAK; INJECTION AB In PBX, an elongated, indented tokamak, an accumulation of impurities leading to strongly peaked radiation profiles was observed, most frequently during the H-mode. The modified device, PBX-M, features a close-fitting stabilizing metallic shell that covers over 85% of the plasma surface and has the capability to produce highly indented plasmas. Two distinct modes of operation were used to generate high-beta equilibria in neutral beam heated discharges: 1) high current, highly indented high-beta(t) plasmas, where the plasma was in close proximity to the stabilizing plates and 2) low current, lesser indented high-beta(p) discharges where the plasma equilibrium shape was more oblate than the shell and the plasma was farther from the plates. In co-injected high-beta(t) plasmas, radiative losses were typically 15-25% of the input power and impurity accumulation was mild even in discharges lasting up to 650 ms with 250 ms H-modes. In high-beta(p) discharges, both co- and counter-injection was investigated. In discharges with tangential co-injection, total radiated power gradually peaked on axis, ultimately reaching 60% of the heating power. H-modes were frequently present and the high-Z impurity density profile was strongly peaked. In tangentially counter-injected discharges, the current profile modification led to the suppression of sawteeth and the near elimination of MHD activity outside the q = 1 surface. The improved particle confinement led to high electron density, high impurity radiation levels and a thermal collapse; however, the concentration and accumulation of metallic impurities was not as severe as the co-injected case. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP PAUL, SF (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. OI Isler, Ralph/0000-0002-5368-7200 NR 12 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 503 EP 508 DI 10.1016/S0022-3115(06)80088-7 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000085 ER PT J AU RAMSEY, AT MANOS, DM AF RAMSEY, AT MANOS, DM TI NOBLE-GAS PUMPING BY THE TFTR GRAPHITE LIMITER SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID CARBON AB The TFTR limiter is graphite. It is possible to decrease the amount of D trapped in the limiter by making plasma discharges with gas injected only as a prefill. When the limiter is deuterium depleted well enough by this technique for supershots (with R(D) approximately 0.5-0.6) it pumps noble gases. The effective confinement time tau(p)* ranges from less-than-or-equal-to 1 s for He down to 0.08 s for Kr. These noble gases escape from the limiter slowly after the run. The partial pressures of Ar and Ne decay with time constants of several hours, and the data for Ar show evidence of two trapping sites. RP RAMSEY, AT (reprint author), PRINCETON UNIV, PRINCETON PLASMA PHYS LAB, PRINCETON, NJ 08543 USA. NR 17 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 509 EP 513 DI 10.1016/S0022-3115(06)80089-9 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000086 ER PT J AU HUA, TQ BROOKS, JN AF HUA, TQ BROOKS, JN TI ANALYSIS OF EROSION AND TRANSPORT OF CARBON IMPURITY IN THE TFTR INNER BUMPER LIMITER REGION SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID REDEPOSITION AB Carbon sputtering and transport on the TFTR inner graphite bumper limiter is investigated with the impurity transport code REDEP. Analysis is carried out for a series of ohmic discharges in TFTR. Predictions for Z(eff) in the core plasma agree well with in situ experimental measurements. Runaway self-sputtering of carbon is predicted at low densities and high edge plasma temperatures when the limiter surface was purged of deuterium. Surface erosion and deposition is analyzed. In general, redeposition reduces the peak erosion by about a factor of 5. Analysis is also carried out for a typical neutral beam heated discharge with a noncircular plasma. Spatial surface erosion and deposition profiles are compared qualitatively with beta backscattering measurements of metal deposition found on the limiter. RP HUA, TQ (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 13 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 514 EP 519 DI 10.1016/S0022-3115(06)80090-5 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000087 ER PT J AU NYGREN, RE DOYLE, BL WALSH, DS OTTENBERGER, W BROOKS, JN KRAUSS, A AF NYGREN, RE DOYLE, BL WALSH, DS OTTENBERGER, W BROOKS, JN KRAUSS, A TI LOW-ENERGY HELIUM IMPLANTATION IN EVAPORATED NICKEL SURFACES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB This paper reports data on helium (He) implantation at low energy (100-200 eV) in nickel (Ni) that support a concept for He self-pumping in tokamaks, and specifically for an experiment in TEXTOR. These data indicate trapping saturates at about 4 X 10(19) He/m2 areal density for He implanted at 100 eV He in Ni at 500-degrees-C. Neither prior implantation of deuterium (D) nor D bombardment of Ni surfaces already containing implanted He significantly changed the He saturation value. A model for trapping capacity and these data were used to predict He self-pumping in TEXTOR. C1 MAX PLANCK INST PLASMA PHYS,W-8046 GARCHING,GERMANY. ARGONNE NATL LAB,ARGONNE,IL 60439. RP NYGREN, RE (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 6 TC 8 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 558 EP 563 DI 10.1016/S0022-3115(06)80098-X PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000095 ER PT J AU JANOS, A FREDRICKSON, ED MCGUIRE, KM NAGAYAMA, Y OWENS, DK WILFRID, E AF JANOS, A FREDRICKSON, ED MCGUIRE, KM NAGAYAMA, Y OWENS, DK WILFRID, E TI POWER LOADING ON THE 1ST WALL DURING DISRUPTIONS IN TFTR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB Heating of the first wall of TFTR due to disruptions is investigated experimentally using an extensive array of thermocouples. By comparing results from discharges with and without disruptions, we extract effects due to the disruption alone. Disruptions preferentially heat the same areas which are heated during discharges without disruptions. Hot areas are inward protrusions or regions unshielded by neighboring areas. Peaking factors in the toroidal direction, defined as peak temperature divided by average toroidal temperature, as a function of poloidal angle, are calculated. For nondisruptive discharges, the peaking factor varies between 2 and 4. For the disruptive portion of a discharge only, the peaking factor near the midplane, where most of the energy is deposited, ranges from 3 to 5. Further away from the midplane, the peaking factor can reach 28, although the heat load is less in that region. RP JANOS, A (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 8 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 602 EP 606 DI 10.1016/S0022-3115(06)80107-8 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000104 ER PT J AU SAMM, U BOEDO, J BERTSCHINGER, G DIPPEL, KH EURINGER, H FINKEN, KH GRAY, D HILLIS, D POSPIESZCZYK, A REITER, D TOKAR, M UNTERBERG, B AF SAMM, U BOEDO, J BERTSCHINGER, G DIPPEL, KH EURINGER, H FINKEN, KH GRAY, D HILLIS, D POSPIESZCZYK, A REITER, D TOKAR, M UNTERBERG, B TI HELIUM EXHAUST IN PLASMAS WITH STRONG RADIATIVE EDGE COOLING SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID TEXTOR TOKAMAK; PUMP LIMITER; TRANSPORT AB The compatibility of radiative edge cooling by neon injection and He exhaust with the pump limiter ALT-II is studied on TEXTOR. It is demonstrated that in plasmas with strong auxiliary heating (2 MW NBI) and with the highest average electron densities (n(e)BAR = 5.5 X 10(19) m-3) the effective confinement time tau(P)* for He has a minimum. This good pumping performance is maintained even for cases in which up to 90% of the heating power is radiated from the plasma boundary (cold radiative edge). The processes inside the scoops of the pump limiter (neutral particle transport, re-ionization) and the variation of particle confinement in the main plasma dominate this behavior. C1 UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024. OAK RIDGE NATL LAB,OAK RIDGE,TN. RP SAMM, U (reprint author), ASS KFA EURATOM,FORSCHUNGSZENTRUM JULICH,INST PLASMAPHYS,JULICH,GERMANY. OI Tokar, Mikhail/0000-0002-9536-9841; Unterberg, Bernhard/0000-0003-0866-957X NR 13 TC 29 Z9 29 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 633 EP 636 DI 10.1016/S0022-3115(06)80113-3 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000110 ER PT J AU DOYLE, BL WALSH, DS WAMPLER, WR AF DOYLE, BL WALSH, DS WAMPLER, WR TI IMPLANTED HE RETENTION AND RELEASE FROM BORONIZED LAYERS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID THERMAL-DESORPTION; CROSS-SECTION; HELIUM; GRAPHITE; CONFINEMENT; TOKAMAK AB He-3 has been implanted at an energy of 3 keV into amorphous hydrogenated boron-carbon (a-BC) films deposited by rf sputtering onto single crystal Si substrates. The initial composition of the films was analyzed by nuclear-enhanced backscattering spectrometry to be B2C with approximately 20% H and approximately 10% O. The areal density of the implanted and retained He-3 was measured in situ by a new ion beam analysis technique using the He-3(He-3, pp) three-body nuclear reaction. The He trapping or pumping efficiency at room temperature is only 3.4% for low fluence implants and the a-BC layer saturates with He at a fluence of 5 x 10(17) He/cm2. At this saturation fluence, only 3.1 X 10(15) He/cm2 is retained in the film. Isochronal annealing of the implanted samples reveals a distributed release of implanted He at approximately 200-degrees-C, which corresponds to a trap activation energy of 1.65 +/- 0.25 eV. He-3 was trapped less efficiently at 250-degrees-C than at room temperature and exhibited a saturated retention of 8.6 X 10(14) He/cm2. These results indicate that wall pumping should play only a minor role in the interpretation of the Textor He-pump experiment carried out earlier this year. The results also show that the unintentional deposition of a-BC, onto He pumping plates could adversely affect the operation of such devices, and should therefore be avoided. RP DOYLE, BL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 19 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 658 EP 663 DI 10.1016/S0022-3115(06)80118-2 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000115 ER PT J AU BROOKS, JN KRAUSS, A NYGREN, RE DOYLE, BL DIPPEL, KH FINKEN, KH AF BROOKS, JN KRAUSS, A NYGREN, RE DOYLE, BL DIPPEL, KH FINKEN, KH TI SUMMARY OF RESULTS FROM THE TEXTOR HELIUM SELF-PUMPING EXPERIMENT SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID IMPURITY CONTROL; LIMITER AB Helium removal experiments were conducted in TEXTOR with a small helium self-pumping module located in a modified ALT-I limiter head. The module contained two heated nickel alloy trapping plates, a nickel deposition filament array, a Langmuir probe, flux probe, and thermocouples. The experiment examined plasma helium removal via trapping of helium ions in the deposited nickel surfaces. Such helium removal was successfully observed, with about 10% of the helium in a 10% He/D plasma being removed in a approximately 1 s period. The module was found to be compatible with overall tokamak operation with essentially no sputtered nickel entering the core plasma. The temperature rise on the ion-exposed inner trapping plate, during a plasma shot, is consistent with a local sheath potential of approximately 3kT(e). Post-tokamak test examination of the trapping plates shows helium atom concentrations in the deposited nickel consistent with the observed helium removal, and shows very small D concentrations. C1 SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. FORSCHUNGSZENTRUM JULICH, ASSOC EURATOM, FORSCHUNGSZENTRUM JULICH, IPP, W-5170 JULICH 1, GERMANY. RP BROOKS, JN (reprint author), ARGONNE NATL LAB, FUS POWER PROGRAM, ARGONNE, IL 60439 USA. NR 7 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 664 EP 669 DI 10.1016/S0022-3115(06)80119-4 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000116 ER PT J AU HASSANEIN, A EHST, DA AF HASSANEIN, A EHST, DA TI DYNAMIC MODELING OF PLASMA VAPOR INTERACTIONS DURING PLASMA DISRUPTIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB Intense deposition of energy in short times on fusion reactor components during a plasma disruption may cause severe surface erosion due to ablation of these components. The exact amount of the eroded material is very important to the reactor design and its lifetime. During the plasma deposition, the vaporized wall material will interact with the incoming plasma particles and may shield the rest of the wall from further damage. The vapor shielding may then prolong the lifetime of these components and increase the reactor duty cycle. To correctly evaluate the impact of vapor shielding effect a comprehensive model is developed. In this model the dynamic slowing down of the plasma particles, both ions and electrons, in the eroded wall material and the resulting interaction processes are established. The generated photons radiation source and the transport of this radiation through the vapor to the wall are modeled. Recent experimental data on disruptions is analyzed and compared with model predictions. RP HASSANEIN, A (reprint author), ARGONNE NATL LAB,FUS POWER PROGRAM,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 15 TC 21 Z9 21 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 680 EP 685 DI 10.1016/S0022-3115(06)80122-4 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000119 ER PT J AU SNIPES, JA MARMAR, ES TERRY, JL BELL, MG BUDNY, RV HILL, KW JASSBY, DL MANSFIELD, DK MEADE, DM PARK, HK STRACHAN, JD STRATTON, BC SYNAKOWSKI, EJ TAYLOR, G RUZIC, DN SHAHEEN, M AF SNIPES, JA MARMAR, ES TERRY, JL BELL, MG BUDNY, RV HILL, KW JASSBY, DL MANSFIELD, DK MEADE, DM PARK, HK STRACHAN, JD STRATTON, BC SYNAKOWSKI, EJ TAYLOR, G RUZIC, DN SHAHEEN, M TI WALL CONDITIONING WITH IMPURITY PELLET INJECTION ON TFTR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID FUSION AB Solid lithium and boron pellets have been injected into TFTR plasmas to improve plasma performance by coating the graphite inner wall bumper limiter with a small amount of lower Z pellet material, which reduces the influx of carbon from the walls and reduces the edge electron density. This new wall conditioning technique has been applied successfully when continued He conditioning discharges, which are normally used for wall conditioning, no longer significantly reduce the carbon and deuterium influxes. The results show that both Li and B pellets significantly improve wall conditioning and lead to 15-20% improvements in supershot plasma performance when injected greater-than-or-equal-to 1 s prior to neutral beam injection in supershot target plasmas. Neutral beam penetration calculations indicate that the lower edge densities resulting from Li or B pellet wall conditioning lead to improved beam penetration. Sputtering yield calculations confirm that the addition of small amounts of Li on a graphite target can significantly reduce the C sputtering yield. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. UNIV ILLINOIS,DEPT NUCL ENGN,URBANA,IL 61801. RP SNIPES, JA (reprint author), MIT,CTR PLASMA FUS,167 ALBANY ST NW 17-103,CAMBRIDGE,MA 02139, USA. NR 13 TC 57 Z9 58 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 686 EP 691 DI 10.1016/S0022-3115(06)80123-6 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000120 ER PT J AU GAHL, JM MCDONALD, JM CRAWFORD, JF MCGRATH, R ZAKHAROV, A TSEREVITINOV, S BARABASH, V GUSEVA, M AF GAHL, JM MCDONALD, JM CRAWFORD, JF MCGRATH, R ZAKHAROV, A TSEREVITINOV, S BARABASH, V GUSEVA, M TI RESULTS FROM THE UNITED-STATES USSR EXCHANGE FOR HEAT LOAD MATERIAL STUDIES OF SIMULATED DISRUPTIONS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PLASMA AB The motivation behind exchange 1.2 of the USSR/US exchange program of cooperation for magnetic confinement fusion is to more closely simulate tokamak disruptions with a variety of plasma devices within the Soviet Union and the United States and to characterize the effect these simulated disruptions have on candidate PFC materials. Earlier work conducted in the Soviet union by a team of Soviet and American researchers showed ablation of graphites exposed to a disruption like heat flux from a plasma flow was significantly less than that previously expected [J.M. Gahl et al., Proc. ICFRM-5, J. Nucl. Mater. 191-194 (1992) 454]. Work has continued and results from recent work at the University of New Mexico are in general agreement with earlier results from the Soviet Union. New results from work in the United States and the Soviet Union will be presented. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RUSSIAN ACAD SCI,INST PHYS CHEM,MOSCOW,RUSSIA. KURCHATOV ATOM ENERGY INST,TROITSK,RUSSIA. EFREMOV INST,ST PETERSBURG,RUSSIA. KURCHATOV ATOM ENERGY INST,MOSCOW,RUSSIA. RP GAHL, JM (reprint author), UNIV NEW MEXICO,ALBUQUERQUE,NM 87131, USA. NR 9 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 692 EP 695 DI 10.1016/S0022-3115(06)80124-8 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000121 ER PT J AU WERLEY, KA AF WERLEY, KA TI ITER EDGE-PLASMA CONDITIONS VERSUS PUMP CONFIGURATION SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID TRANSPORT AB Two-dimensional fluid simulations of ITER double-null divertor scrape-off layer plasma conditions have been limited to considerations of a single outboard divertor plate with up/down symmetry assumed. The present work evaluates the effect of pumping at only one plate on particle flow patterns and divertor power loads. Pumping only at one plate reduces sheath temperatures at both plates, but increases the heat flux at the pumped plate. The physics assumptions for separatrix density (n(SEP) = [n]/3.5) and for radial particle diffusivity (D = 0.66 m2/s) used in the simulation of ITER edge plasma result in particle throughputs two orders of magnitude greater than that required for acceptable fusion-product ash removal rates. The main-plasma particle confinement time, however, is an order of magnitude shorter than the transport energy confinement time, tau(E). Plasmas (D = 0.04 m2/s) which would have tau(p) is similar to tau(E) are evaluated and are found to have unacceptably high plasma temperatures and heat flux at the plate. Ash removal rates are still acceptable. A plasma recycle coefficient (at the divertor plate) of R = 0.965 reduces the particle throughput by a factor of 2.8 below the case without recycle. RP WERLEY, KA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 765 EP 769 DI 10.1016/S0022-3115(06)80139-X PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000136 ER PT J AU TSUI, HYW WOOTTON, AJ BELL, JD BENGTSON, RD DIEBOLD, D HARRIS, JH HERSHKOWITZ, N HIDALGO, C INGRAHAM, JC LI, GX LIN, H LUCKHARDT, SC MANOS, DM MEIER, MA MILLER, GM MUNSON, CP PEW, J RITZ, CP RUDYJ, A SCHOENBERG, KF SORENSEN, J TANAKA, T UCKAN, T WEBER, PG AF TSUI, HYW WOOTTON, AJ BELL, JD BENGTSON, RD DIEBOLD, D HARRIS, JH HERSHKOWITZ, N HIDALGO, C INGRAHAM, JC LI, GX LIN, H LUCKHARDT, SC MANOS, DM MEIER, MA MILLER, GM MUNSON, CP PEW, J RITZ, CP RUDYJ, A SCHOENBERG, KF SORENSEN, J TANAKA, T UCKAN, T WEBER, PG TI A DATABASE FOR EDGE TURBULENCE AND TRANSPORT STUDIES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID ANOMALOUS TRANSPORT; TOKAMAKS AB A database consisting of edge equilibrium, turbulence and transport related plasma parameters has been compiled. Initial results related to fluctuation phenomena are presented. In particular the electrostatic and electromagnetic nature of the fluctuations, the scaling of various transport related parameters, comparison of fluctuation driven particle fluxes with estimates of the total particle fluxes and the relative importance of conduction to convection energy loss are discussed. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37830. UNIV WISCONSIN,MADISON,WI 53706. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL,MADRID,SPAIN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. MIT,CTR PLASMA FUS,ELECTR RES LAB,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. MAX PLANCK INST PLASMA PHYS,W-8046 GARCHING,GERMANY. RP TSUI, HYW (reprint author), UNIV TEXAS,FUS RES CTR,AUSTIN,TX 78712, USA. NR 15 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 794 EP 799 DI 10.1016/S0022-3115(06)80144-3 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000141 ER PT J AU JONG, RA PORTER, GD HILL, DN BUCHENAUER, DA BRAMSON, G AF JONG, RA PORTER, GD HILL, DN BUCHENAUER, DA BRAMSON, G TI DIII-D EDGE PHYSICS DATA-BASE SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID POLOIDAL DIVERTOR; TOKAMAK; SYSTEM AB We have developed an edge physics data base containing data for the plasma in the divertor region and the scrape-off layer (SOL) for the DIII-D tokamak. The data base provides many of the parameters necessary to model the power flow to the divertor and other plasma processes in the plasma edge. It will also facilitate the analysis of DIII-D data for comparison with other divertor tokamaks. In addition to the core plasma parameters, edge-specific data are included in this data base. Initial results using the data base show good agreement between the pressure profiles measured by the Langmuir probes and those determined from the Thomson data for the inner strike point, but not for the outer strike point region. We also find that the ratio of separatrix density to average core density, as well as the in/out asymmetry in the SOL power at the divertor in DIII-D do not agree with values currently assumed in modeling the international thermonuclear experimental reactor (ITER). C1 GEN ATOM CO,SAN DIEGO,CA 92138. SANDIA NATL LABS,LIVERMORE,CA 94550. RP JONG, RA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 16 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 800 EP 803 DI 10.1016/S0022-3115(06)80145-5 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000142 ER PT J AU ALLEN, SL RENSINK, ME HILL, DN WOOD, R NILSON, D LOGAN, BG STAMBAUGH, R PETRIE, TW STAEBLER, GM MAHDAVI, MA HULSE, R CAMPBELL, RB AF ALLEN, SL RENSINK, ME HILL, DN WOOD, R NILSON, D LOGAN, BG STAMBAUGH, R PETRIE, TW STAEBLER, GM MAHDAVI, MA HULSE, R CAMPBELL, RB TI A DESIGN STUDY FOR AN ADVANCED DIVERTOR FOR DIII-D AND ITER - THE RADIATIVE SLOT DIVERTOR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB Reduction of the divertor heat load is an important issue for future tokamaks, particularly during the technology phase of ITER. We discuss a conceptual design for one type of advanced divertor: the radiative slot divertor. The goal of this divertor configuration is to enhance the radiation in the divertor region and thereby reduce the heat load at the strike points. At the same time, any effects on the core plasma must be minimized. Proof-of-principle experiments to enhance the radiation in the DIII-D divertor have been performed both with deuterium and impurity injection. We compare several computer models with results from these experiments to predict performance and thereby guide designs of radiative divertors for future machines. We have estimated impurity radiation using calculations of the background plasma with a two-dimensional fluid code (B2 or LEDGE) coupled with models of impurity radiation. The DEGAS code has been used to estimate hydrogenic transport, charge exchange, and radiation losses. Estimates of impurity transport are provided by 1 1/2-dimensional models and calculations of impurity frictional-force terms. These model results are in qualitative agreement with the approximately 1 MW reduction of measured divertor power in DIII-D during divertor impurity puffing experiments. Specific designs, including engineering details, for applications to DIII-D and ITER will be discussed. C1 GEN ATOM CO,SAN DIEGO,CA 92138. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ. SANDIA NATL LABS,LIVERMORE,CA 94550. RP ALLEN, SL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 14 TC 27 Z9 27 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 804 EP 809 DI 10.1016/S0022-3115(06)80146-7 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000143 ER PT J AU WATKINS, JG MOYER, RA HILL, DN BUCHENAUER, D CARLSTROM, TN CONN, R CUTHBERTSON, J DOERNER, R LEHMER, R MAHDAVI, MA MCGRATH, RT SCHMITZ, L STAMBAUGH, R AF WATKINS, JG MOYER, RA HILL, DN BUCHENAUER, D CARLSTROM, TN CONN, R CUTHBERTSON, J DOERNER, R LEHMER, R MAHDAVI, MA MCGRATH, RT SCHMITZ, L STAMBAUGH, R TI SCRAPE-OFF LAYER MEASUREMENTS IN DIII-D SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID D DIVERTOR; SCATTERING; TOKAMAKS; BOUNDARY; SYSTEM AB In this paper, scrape-off layer measurements in DIII-D are presented as a function of the main discharge plasma parameters. A systematic study is under way to understand and predict the behavior of the edge and divertor plasma in DIII-D and this scaling behavior will be crucial for the design of ITER. To facilitate the studies, a fast reciprocating Langmuir probe incorporating five graphite tips was installed at the midplane of DIII-D which has the capability of performing multiple plunges 1 cm inside the separatrix during 5 MW of NBI. Density and temperature profiles in the midplane (reciprocating probe), near the top (Thomson scattering) and at the lower divertor plate (fixed Langmuir probe array) are compared by mapping the measurements into magnetic flux coordinates. Local pressure measurements are compared on different parts of a flux surface. The three different local measurements also indicate the spatial evolution of plasma conditions as plasma approaches the divertor plate. Ohmic and L-mode discharges exhibit similar (exponential) density and temperature decay in the scrape-off layer. H-mode discharges, however, display a faster spatial decay reflecting at least a factor of 3 decrease in the perpendicular diffusion coefficient. Consistency of the magnitude and scaling behavior of the edge profile parameters with models of the scrape-off layer is examined. C1 UNIV CALIF LOS ANGELES, IPFR, LOS ANGELES, CA USA. UNIV CALIF LOS ANGELES, DEPT MANE, LOS ANGELES, CA USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. SANDIA NATL LABS, LIVERMORE, CA 94550 USA. GEN ATOM CO, SAN DIEGO, CA 92138 USA. RP WATKINS, JG (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 15 TC 21 Z9 21 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 829 EP 832 DI 10.1016/S0022-3115(06)80151-0 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000148 ER PT J AU PETRIE, TW BUCHENAUER, D HILL, DN KLEPPER, C ALLEN, S CAMPBELL, R FUTCH, A GROEBNER, RJ LEONARD, A LIPPMANN, S MAHDAVI, MA RENSINK, M WEST, P AF PETRIE, TW BUCHENAUER, D HILL, DN KLEPPER, C ALLEN, S CAMPBELL, R FUTCH, A GROEBNER, RJ LEONARD, A LIPPMANN, S MAHDAVI, MA RENSINK, M WEST, P TI DIVERTOR HEAT-FLUX REDUCTION BY D(2) INJECTION IN DIII-D SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PLASMA; TOKAMAKS AB D2 gas injected into ELMing H-mode discharges in DIII-D reduced the total integrated heat flux to the divertor approximately 2X and the peak heat flux approximately 5X, with only modest degradation to plasma stored energy. Steady gas injection without particle pumping results in eventual degradation in stored energy. The initial reduction in peak heat flux at the divertor tiles may be primarily due to the increase in radiated power from the X-point/divertor region. The eventual formation of a high density region near the X-point appears to play a role in momentum (and energy) transfer from the flux surfaces near the outboard strike point to flux surfaces farther out into the scrape-off. This may also contribute to further reduction in peak heat flux. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. SANDIA NATL LABS,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PETRIE, TW (reprint author), GEN ATOM CO,POB 85608,SAN DIEGO,CA 92186, USA. NR 12 TC 102 Z9 102 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 848 EP 853 DI 10.1016/S0022-3115(06)80155-8 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000152 ER PT J AU MOYER, RA WATKINS, JG CONN, RW DOERNER, R HILL, DN LEHMER, R MCGRATH, RT SCHMITZ, L STAMBAUGH, RD TYNAN, G AF MOYER, RA WATKINS, JG CONN, RW DOERNER, R HILL, DN LEHMER, R MCGRATH, RT SCHMITZ, L STAMBAUGH, RD TYNAN, G TI EXB TRANSPORT IN THE DIII-D BOUNDARY PLASMA SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID L-H TRANSITION; POLOIDAL ROTATION; EDGE TURBULENCE; D TOKAMAK; FLUCTUATIONS; ASYMMETRIES; FIELD AB We have measured the electrostatic turbulence and associated particle transport in the DIII-D boundary plasma using a fast reciprocating Langmuir probe array located on the outboard midplane. Both the normalized rms fluctuation levels (density and floating potential) and the fluctuation-driven particle transport are altered by the L-H transition in the SOL. At the separatrix, the density fluctuation level is reduced a factor of 2, consistent with reflectometry results. There is a corresponding decrease in the turbulent particle flux. Deeper in the SOL, the turbulent particle transport in H-mode exceeds the L-mode value. The perpendicular diffusion coefficient D(perpendicular-to) and particle confinement time tau(p) have been estimated, assuming that the transport is purely turbulent and uniform on a flux surface. We find D(perpendicular-to) = 0.7D(B) (L) and 0.04D(B) (ELM-free H), and tau(p) = 54 ms (L) and 480 ms (ELM-free H). C1 GEN ATOM CO,SAN DIEGO,CA 92186. UNIV CALIF LOS ANGELES,DEPT NUCL ENGN,LOS ANGELES,CA 90024. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MOYER, RA (reprint author), UNIV CALIF LOS ANGELES,INST PLASMA & FUS RES,LOS ANGELES,CA 90024, USA. NR 27 TC 24 Z9 24 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 854 EP 859 DI 10.1016/S0022-3115(06)80156-X PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000153 ER PT J AU FUTCH, AH MATTHEWS, GF BUCHENAUER, D HILL, DN JONG, RA PORTER, GD AF FUTCH, AH MATTHEWS, GF BUCHENAUER, D HILL, DN JONG, RA PORTER, GD TI EFFECTS OF NEUTRAL GAS COLLISIONS ON THE POWER TRANSMISSION FACTOR AT THE DIVERTOR SHEATH SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PLASMA AB We show that charge-exchange and other ion-neutral collisions can reduce the power transmission factor of the plasma sheath, thereby lowering the ion impact energy and target plate sputtering. The power transmission factor relates the heat flux reaching the divertor target to the plasma density and temperature just in front of the surface: delta = Q(surf)/J(ew)k T(e). Experimental data from the DIII-D tokamak suggests that delta could be as low as 2-3 near the region of peak divertor particle flux, instead of the 7-8 expected from usual sheath theory. Several effects combine to allow ion-neutral interactions to be important in the divertor plasma sheath. The shallow angle of incidence of the magnetic field (1-3-degrees in DIII-D) leads to the spatial extension of the sheath from approximately rho(i) approximately 1 mm normal to the plate [R. Chodura, Phys. Fluids 25 (1982) 1628] to several centimeters along the field lines. Ionization reduces the sheath potential, and collisions reduce the ion impact energy. RP FUTCH, AH (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5511,LIVERMORE,CA 94551, USA. NR 14 TC 31 Z9 31 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 860 EP 864 DI 10.1016/S0022-3115(06)80157-1 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000154 ER PT J AU WONG, CPC JUNGE, R PHELPS, RD POLITZER, P PUHN, F WEST, WP BASTASZ, R BUCHENAUER, D HSU, W BROOKS, J HUA, T AF WONG, CPC JUNGE, R PHELPS, RD POLITZER, P PUHN, F WEST, WP BASTASZ, R BUCHENAUER, D HSU, W BROOKS, J HUA, T TI DIVERTOR MATERIALS EVALUATION SYSTEM AT DIII-D SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB The divertor material evaluation system (DIMES) at DIII-D is a collaborative program between General Atomics, Sandia National Laboratories (SNL), and Argonne National Laboratory (ANL). This program was initiated in response to the need for understanding the interaction between the plasma and divertor surface materials in tokamaks. Material erosion, tritium retention, disruption effects and material transport are very important topics for the design of ITER. The first phase of the DIMES study is integral material exposure measurements. The second phase of the study is the installation of the DIMES sample changer mechanism. The mechanical design goal for the second phase is to allow the insertion of test materials and instrumented samples into the bottom divertor plate region of DIII-D without venting the tokamak. Various samples can then be exchanged overnight after exposures as short as one plasma shot. This paper presents the results of the integral experiments, the design of the DIMES sample changer mechanism and the planning of material evaluation experiments at DIII-D using the DIMES mechanism. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. ARGONNE NATL LAB,ARGONNE,IL 60439. RP WONG, CPC (reprint author), GEN ATOM CO,POB 85608,SAN DIEGO,CA 92186, USA. NR 3 TC 45 Z9 45 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 871 EP 875 DI 10.1016/S0022-3115(06)80159-5 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000156 ER PT J AU CHIU, GS COHEN, SA AF CHIU, GS COHEN, SA TI INVESTIGATION OF HELIUM PLASMAS NEAR MATERIAL-SURFACES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID SIMULATION; PRESHEATH; FLOW AB Experiments have been performed on a linear, lower-hybrid-wave-heated plasma device in which a low-temperature, magnetized, helium plasma of collisionality approximately 1-10 is produced. The plasmas are directed onto a biasable graphite target. Axial and radial Langmuir probe measurements were taken with 1 mm spatial resolution and 10 ms temporal resolution as a function of target bias. The achieved peak pressure is nT almost-equal-to 1.5 X 10(14) cm-3 eV. In the low recycling mode of operation, the plasma density is found to decrease about a factor of 2 with decreasing distance from the target, while the electron temperature remains constant. These results have been compared with plasma simulations made with the B2 2D fluid code, modified to include radial transport and atomic physics of helium. RP CHIU, GS (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 876 EP 882 DI 10.1016/S0022-3115(06)80160-1 PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000157 ER PT J AU PETRAVIC, M AF PETRAVIC, M TI A CODE FOR STUDYING PLASMAS IN CONTACT WITH SOLIDS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB A new time dependent 2-D code, PLANET-TD, has been developed for plasma edge simulations with a particular emphasis on plasma neutral gas-wall interaction. The code has its own diffusive neutral transport model but can also operate in conjunction with the DEGAS neutral transport code. The high (neutral hydrogen) recycling and substantial low-Z impurity content conditions are of great importance for the magnetic fusion research. The PLANET-TD code has the capability of treating the strongly coupled system of hydrogen plasma, impurity plasma, and neutral gas simultaneously. Consequently, the situations with large energy dissipation from a (tokamak) edge plasma can be studied. An application designed to explore the limits of high recycling is described and the results are discussed. RP PETRAVIC, M (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 10 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 883 EP 887 DI 10.1016/S0022-3115(06)80161-3 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000158 ER PT J AU COHEN, SA ARTUN, O AF COHEN, SA ARTUN, O TI A SCALING RELATION FOR THE ITER SCRAPE-OFF LAYER THERMAL-DIFFUSIVITY SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID ENERGY CONFINEMENT; TURBULENCE; TOKAMAKS; PLASMA AB We have generated an empirically based scaling relation for the thermal diffusivity, (s)chi(perpendicular-to), in the scrape-off layers (SOL) of tokamaks using a database of global energy confinement time versus core plasma parameters from 110 ohmically heated tokamak discharges whose core plasma parameters, viz., T(e), n(e), B, curvature, radial scale length, and Z(eff), are similar to the values expected in the SOL of tokamaks like ITER. These data were interpreted with an all-possible-regressions model/multiple-regressions analysis to obtain the best fit for tau(E) versus n(e), T(e), R, a, Z(eff) and V. A cylindrical-shell thermal transport model was used to extract (s)chi(perpendicular-to) from tau(E). Reasons for ignoring the effects on (s)chi(perpendicular-to) of sheath phenomena and parallel transport on open field lines are discussed. C1 BOGAZICI UNIV,ISTANBUL,TURKEY. RP COHEN, SA (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 26 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 888 EP 893 DI 10.1016/S0022-3115(06)80162-5 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000159 ER PT J AU STOTLER, DP COSTER, DP BRAAMS, BJ EHRHARDT, AB KARNEY, CFF PETRAVIC, M AF STOTLER, DP COSTER, DP BRAAMS, BJ EHRHARDT, AB KARNEY, CFF PETRAVIC, M TI SCRAPE-OFF LAYER MODELING USING COUPLED PLASMA AND NEUTRAL TRANSPORT CODES SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB An effort is made to refine the neutral transport model used in the B2 edge plasma code by coupling it to the DEGAS Monte Carlo code. Results are discussed for a simulation of a high recycling divertor. It appears that on the order of 100 iterations between the two codes are required to achieve a converged solution. However, the amount of computer time used in the DEGAS simulations is large, making complete runs impractical for design purposes. On the other hand, the differences in the resulting plasma parameters when compared to the B2 analytic neutrals model indicate that it would be worthwhile to explore techniques for speeding up the coupled system of codes. RP STOTLER, DP (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. RI Braams, Bastiaan/E-7687-2011; Karney, Charles/C-1371-2013; Coster, David/B-4311-2010; Stotler, Daren/J-9494-2015 OI Braams, Bastiaan/0000-0003-4086-9969; Karney, Charles/0000-0002-5006-5836; Coster, David/0000-0002-2470-9706; Stotler, Daren/0000-0001-5521-8718 NR 12 TC 7 Z9 7 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 894 EP 898 DI 10.1016/S0022-3115(06)80163-7 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000160 ER PT J AU MANOS, DM BENNETT, T HERZER, M SCHWARZMANN, J AF MANOS, DM BENNETT, T HERZER, M SCHWARZMANN, J TI LABORATORY STUDIES OF SPECTROSCOPIC MARKERS FOR THE CHARACTERIZATION OF SURFACE EROSION BY PLASMAS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB The erosion rates in portions of fusion plasma devices like the ITER tokamak are sufficiently high that nearly real-time information on cumulative removal is needed for control and machine safety. We are developing a digitally-encoded scheme to indicate the depth of erosion at numerous poloidal and toroidal locations around ITER. The scheme uses materials embedded in the walls and divertors to present remotely detectable signals. This paper reports laboratory experiments on prototype markers consisting of combinations of up to five elements (Au, Pd, Ag, In, Ga) along with Au, Pt, and Ta pure metals. The markers were bonded to 4-D carbon-carbon composite of the type proposed for use in the ITER first wall, and exposed to He bombardment in the lower-hybrid-driven plasma of the atomic beam facility at PPL. The paper describes this device. Light emission was characterized using a 1 m Czerny-Turner vacuum ultraviolet monochromator. The samples were characterized both before and after plasma exposure by Auger spectroscopy. We report the time-dependent behavior of the spectra of the visible and ultraviolet light emitted by the plasma. When the markers are uncovered by the erosion, emission lines of the marker elements are easily distinguished from the He background plasma lines. The dependence of the light intensity on bias voltage is compared to the known sputtering yields of the elements. The optical detection method allows exploration of the threshold dependence of these multi-element targets. An exponential dependence of yield above threshold was observed for all of the elements studied, in contrast to previous models. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. NR 22 TC 2 Z9 2 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 933 EP 940 DI 10.1016/S0022-3115(06)80171-6 PG 8 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000168 ER PT J AU CAUSEY, RA WAMPLER, WR BUZHINSHIJ, OI AF CAUSEY, RA WAMPLER, WR BUZHINSHIJ, OI TI TRITIUM RETENTION CHARACTERISTICS OF SEVERAL LOW-Z MATERIALS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB The conditions that exist in a fusion reactor often require very specialized materials. In locations where there is interaction with the plasma, it is desirable to have the material composed of low-Z elements to minimize radiative cooling of the plasma. While graphite and beryllium are low-Z and satisfy many of the requirements for plasma-facing components, there are problems associated with their use that leads the fusion designer to search for alternative materials. As part of this search, the tritium retention characteristics of boron doped graphites, boron nitride, and silicon carbide have been measured in laboratory experiments. Experiments performed with USB-15, a boron-doped graphite, show boron-doping to suppress the retention of tritium in graphite. The silicon carbide results reveal a very low apparent solubility for tritium. The behavior of tritium in boron nitride was more like that for a metal than the other two materials tested as the diffusion of the tritium into boron nitride was seen at much lower temperatures. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. IV KURCHATOV INST,TOMSK,RUSSIA. RP CAUSEY, RA (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 6 TC 8 Z9 8 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 977 EP 980 DI 10.1016/S0022-3115(06)80179-0 PG 4 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000176 ER PT J AU WAMPLER, WR AF WAMPLER, WR TI TRAPPING OF DEUTERIUM IN BERYLLIUM SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID HIGH-PURITY BERYLLIUM; ION-BEAM; HYDROGEN AB The thermal release of deuterium (D) implanted into beryllium and the internal redistribution between traps at different depths was studied using ion-beam analysis methods. These methods allow surface effects and trapping to be characterized independently which is difficult from measurements of thermal release alone. At low concentrations D iS trapped at lattice damage and is thermally detrapped around 450-degrees-C. Transport simulations indicate that the energy barrier for detrapping is about 2.3 eV. At high concentrations D precipitates into gas bubbles. Release of D from the bubbles occurs by permeation from high pressure D2 gas inside the bubbles through the Be lattice to the surface. The permeability of D through Be determined from these experiments was about 2 X 10(5) D/(cm s atm1/2) at 600-degrees-C, seven orders of magnitude smaller than the value calculated from published solubility and diffusivity data. The oxidized Be surface did not limit the D release. RP WAMPLER, WR (reprint author), SANDIA NATL LABS,1112,ALBUQUERQUE,NM 87185, USA. NR 27 TC 49 Z9 49 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 981 EP 985 DI 10.1016/S0022-3115(06)80180-7 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000177 ER PT J AU ANDERL, RA HANKINS, MR LONGHURST, GR PAWELKO, RJ MACAULAYNEWCOMBE, RG AF ANDERL, RA HANKINS, MR LONGHURST, GR PAWELKO, RJ MACAULAYNEWCOMBE, RG TI HYDROGEN TRANSPORT BEHAVIOR OF BERYLLIUM SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID HIGH-PURITY BERYLLIUM; DEUTERIUM; PERMEATION; DIFFUSION; RETENTION AB Beryllium is being evaluated for use as a plasma-facing material in the International Thermonuclear Experimental Reactor (ITER). One concern in the evaluation is the retention and permeation of tritium implanted into the plasma-facing surface. We performed laboratory-scale studies to investigate mechanisms that influence hydrogen transport and retention in beryllium foil specimens of rolled powder metallurgy product and rolled ingot cast beryllium. Specimen characterization was accomplished using scanning electron microscopy, Auger electron spectroscopy, and Rutherford backscattering spectrometry (RBS) techniques. Hydrogen transport was investigated using ion-beam permeation experiments and nuclear reaction analysis (NRA). Results indicate that trapping plays a significant role in permeation, re-emission, and retention, and that surface processes at both upstream and downstream surfaces are also important. C1 MCMASTER UNIV,DEPT ENGN PHYS,HAMILTON L8S 4L7,ONTARIO,CANADA. RP ANDERL, RA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 20 TC 28 Z9 28 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 986 EP 991 DI 10.1016/S0022-3115(06)80181-9 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000178 ER PT J AU LOARER, T UCKAN, T CHATELIER, M HORTON, LD MIODUSZEWSKI, PK AF LOARER, T UCKAN, T CHATELIER, M HORTON, LD MIODUSZEWSKI, PK TI EFFECT OF IMPURITIES ON PARTICLE COLLECTION STUDIES WITH A MODULAR PUMP LIMITER ON TORE SUPRA SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS AB Particle collection experiments with a modular pump limiter in Tore Supra, for ohmic and additional power heating, are reported. The essential feature of these experiments is that the pressure buildup in the pump limiter plenum is only driven by the hydrogen influx whereas the total ion influx in the throat is shown to be partly due to impurities. This is consistent with experimental results which show similar evolution of Z(eff) in the plasma and of the ratio GAMMA(T)/p of the total ion influx GAMMA(T) in the throat to the pressure p in the plenum. Particle collection efficiency, in terms of the hydrogen influx GAMMA(D) to the pressure ratio GAMMA(D)/p, is shown to be roughly constant over the density (ohmic) and additional power ranges studied. C1 OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37830. RP LOARER, T (reprint author), CEN CADARACHE,CEA FUS CONTROLEE,ASSOC EURATOM,F-13108 ST PAUL DURANCE,FRANCE. NR 6 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 1078 EP 1082 DI 10.1016/S0022-3115(06)80199-6 PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000196 ER PT J AU HOGAN, J MIODUSZEWSKI, P OWEN, L UCKAN, T KLEPPER, C CHATELIER, M LOARER, T HORTON, L AF HOGAN, J MIODUSZEWSKI, P OWEN, L UCKAN, T KLEPPER, C CHATELIER, M LOARER, T HORTON, L TI MODELING OF CORE-WALL PARTICLE DYNAMICS IN TORE SUPRA PUMPING EXPERIMENTS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PLASMA AB Particle control experiments in Tore Supra have shown that the change in core plasma density with pumping at the outboard pump limiter amounts only to a small fraction of the total number of particles extracted by the outboard pump limiter system. To develop a model for the core-wall particle exchange at the level of individual basic physical processes, the particle exchange between the core plasma and the wall has been modeled in detail for a series of Tore Supra discharges. Core and scrape-off layer particle balance and wall diffusion calculations were performed using a radial transport code and a 1D wall diffusion code. Core-wall particle exchange for the case of the outboard pump limiter is found to be mediated by the localized charge exchange flux in the near limiter region. The wall particle efflux required for detailed balance does not match that calculated to be available from the near limiter wall region unless some local heating of the wall is assumed. C1 CEA CADARACHE,F-13108 ST PAUL DURANCE,FRANCE. JET,JOINT UNDERTAKING,ABINGDON OX14 3EA,OXON,ENGLAND. RP HOGAN, J (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 10 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 1083 EP 1089 DI 10.1016/S0022-3115(06)80200-X PG 7 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000197 ER PT J AU KLEPPER, CC HOGAN, JT MIODUSZEWSKI, PK MAHDAVI, MA MAINGI, R OWEN, LW SCHAFFER, MJ BUCHENAUER, D EVANS, TE GILLIGAN, JG HAAS, G HILL, DN JACKSON, GL PETRIE, TW AF KLEPPER, CC HOGAN, JT MIODUSZEWSKI, PK MAHDAVI, MA MAINGI, R OWEN, LW SCHAFFER, MJ BUCHENAUER, D EVANS, TE GILLIGAN, JG HAAS, G HILL, DN JACKSON, GL PETRIE, TW TI COMPARISON OF TRANSIENT AND STATIONARY NEUTRAL PRESSURE RESPONSE IN THE DIII-D ADVANCED DIVERTOR SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID TOKAMAKS AB The DIII-D divertor baffle system was designed to facilitate density control in long pulse H-mode discharges by removing a particle flux equal to the neutral beam fueling rate (approximately 20 Torrl/s) with a approximately 1 mTorr neutral pressure under the baffle (p0). Initial measurements of the baffle pressure indicated that p0 approximately 10 mTorr (without pumping or biasing), a value much in excess of that required for long pulse density control. Radial sweeps of the X-point position have been employed to determine the maximum p0, as well as to establish the dependence of this pressure on geometry. An estimate of the particle equilibration time for the baffle system has been made by studying the baffle pressure response to ''giant'' ELM effects. ''Steady state'' experiments in which the X-point position was fixed for approximately 2.5 s have also been carried out and steady baffle pressures were observed. The scaling of baffle pressure with plasma parameters has been found to be similar under transient and ''steady state'' conditions. Detailed modeling of these experiments with the B2, DEGAS, and WDIFFUSE (wall model) codes has been performed. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 15 TC 4 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 1090 EP 1095 DI 10.1016/S0022-3115(06)80201-1 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000198 ER PT J AU OWEN, LW CHATELIER, M HOGAN, JT KLEPPER, CC LOARER, T MIODUSZEWSKI, PK UCKAN, T AF OWEN, LW CHATELIER, M HOGAN, JT KLEPPER, CC LOARER, T MIODUSZEWSKI, PK UCKAN, T TI EFFECTS OF IONIZING SCRAPE-OFF LAYERS ON LOCAL RECYCLING IN TORE SUPRA PUMP LIMITER EXPERIMENTS SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES ( PSI-10 ) CY MAR 30-APR 03, 1992 CL MONTEREY, CA SP US DOE, SANDIA NATL LABS ID PARTICLE AB A series of ohmic discharges with active Pumping in the Tore Supra outboard pump limiter has been analyzed with the DEGAS neutrals transport code and an analytic scrape-off layer (SOL) plasma model. Pumping speed and plenum pressure measurements indicated 5-10 Torr l/s throughput with only modest effect on density (dN(core)/dt < 0.5 Torr l/s). A model is developed in which large exhaust fluxes, with little attendant effect on core plasma density, are explained in terms of SOL ionization of recycled and wall-desorbed neutrals. Particle balance with active pumping and constant line density requires that the wall return flux exceed the incident flux by approximately the pump throughput in the absence of external fueling. The radial profile of the H+ source rate from ionization and dissociation of wall-desorbed molecules is seen to peak very near the radial position of the limiter throat. Consequently, a strong recycling vortex is created in the region of the limiter, with the ion flux amplified by factors of almost-equal-to 2 at the outer limiter surfaces and > 3 within the limiter throat. The calculations indicate that less than 30% of the pump throughput is due to first generation ions from the core efflux, with the balance from local recycling in the strongly ionizing SOL. C1 CEN CADARACHE,ASSOC CEA EURATOM,F-13108 ST PAUL DURANCE,FRANCE. RP OWEN, LW (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP 1125 EP 1130 DI 10.1016/S0022-3115(06)80208-4 PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000205 ER PT J AU BAUER, W HSU, WL JACKSON, GL PORTER, GD AF BAUER, W HSU, WL JACKSON, GL PORTER, GD TI PLASMA-SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES - PROCEEDINGS OF THE 10TH INTERNATIONAL-CONFERENCE ON PLASMA SURFACE INTERACTIONS IN CONTROLLED FUSION DEVICES MONTEREY, CA, USA, MARCH 30 APRIL 3, 1992 - PREFACE SO JOURNAL OF NUCLEAR MATERIALS LA English DT Editorial Material C1 GEN ATOM CO,SAN DIEGO,CA 92138. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BAUER, W (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD DEC PY 1992 VL 196 BP R7 EP R8 DI 10.1016/S0022-3115(06)80003-6 PG 2 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA KG250 UT WOS:A1992KG25000001 ER PT J AU VALK, PE MATHIS, CA PRADOS, MD GILBERT, JC BUDINGER, TF AF VALK, PE MATHIS, CA PRADOS, MD GILBERT, JC BUDINGER, TF TI HYPOXIA IN HUMAN GLIOMAS - DEMONSTRATION BY PET WITH FLUORINE-18-FLUOROMISONIDAZOLE SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID RADIOLABELED FLUOROMISONIDAZOLE; OXYGEN; MISONIDAZOLE; BRAIN; RADIOSENSITIZATION; BINDING; MARKERS; TUMORS; AGENT; RB-82 AB Positron emission tomography (PET) with the hypoxic-cell tracer [F-18]fluoromisonidazole presents a possible means of noninvasively demonstrating tumor hypoxia. PET studies using this tracer were performed in three patients with malignant glioma, and in all patients the tumor was clearly seen at 5 min postinjection and initial tumor activity exceeded cortical activity. In one patient, there was no tumor retention of [F-18] fluoromisonidazole and tumor activity fell while cortical activity increased, with the two tissues reaching equality at 40-50 min. The tumor-to-plasma ratio was 0.71 at 3 hr. The other two patients showed variable tumor retention of [F-18]fluoromisonidazole, with tumor-to-plasma ratios of 1. 1 0 and 1.49 at 2 and 3 hr. These results demonstrate the feasibility of using [F-18]fluoromisonidazole PET to detect hypoxia in human gliomas in vivo. Clinical trials are needed to determine whether a relationship exists between [F-18]fluoromisonidazole uptake and tumor radiation response. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF SAN FRANCISCO,SCH MED,SAN FRANCISCO,CA 94143. RI Mathis, Chester/A-8607-2009 NR 24 TC 149 Z9 153 U1 0 U2 1 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD DEC PY 1992 VL 33 IS 12 BP 2133 EP 2137 PG 5 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA KB965 UT WOS:A1992KB96500021 PM 1334136 ER PT J AU AHO, JM MULVEY, M JACOBSON, KC ESCH, GW AF AHO, JM MULVEY, M JACOBSON, KC ESCH, GW TI GENETIC DIFFERENTIATION AMONG CONGENERIC ACANTHOCEPHALANS IN THE YELLOW-BELLIED SLIDER TURTLE SO JOURNAL OF PARASITOLOGY LA English DT Article ID ELECTROPHORETIC DATA; POPULATION-GENETICS; ENTERIC HELMINTHS; HOST; VARIABILITY; COMMUNITIES; SYSTEMATICS; DIVERGENCE; ASCARIDIDA; ATLANTIC AB Allozyme variation in Neoechinorhynchus was used to examine the hypothesis that the occurrence of a single morphologically variable species may account for the observation of overlapping distributional patterns within the intestine of the yellow-bellied slider turtle (Trachemys scripta). Genetic analysis of 6 enzyme loci excluded the single species hypothesis and was consistent with the occurrence of 4 congeneric species within the turtle population. Discriminant analysis of multilocus genotypes, however, indicated that species designation based primarily on female body and egg morphology may not be error free. Individual turtles may harbor worms of a given species that are genetically different. Genetic variation on this scale may cause confusion in studies of helminth population and community structure. Subtle differences in species composition and distribution have the potential to confound community analyses, and further studies are needed to examine patterns in molecular-morphological taxonomic congruence. C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. NR 36 TC 16 Z9 17 U1 0 U2 1 PU AMER SOC PARASITOLOGISTS PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0022-3395 J9 J PARASITOL JI J. Parasitol. PD DEC PY 1992 VL 78 IS 6 BP 974 EP 981 DI 10.2307/3283216 PG 8 WC Parasitology SC Parasitology GA KL322 UT WOS:A1992KL32200004 ER PT J AU EMERY, VJ KIVELSON, SA AF EMERY, VJ KIVELSON, SA TI LOW-ENERGY PHYSICS OF HIGH-TEMPERATURE SUPERCONDUCTORS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE HIGH-TC; PHASE SEPARATION; CHARGE DYNAMICS; SPIN DYNAMICS; KONDO ID PHOTOINDUCED-ABSORPTION SPECTROSCOPY; MUON-SPIN-RELAXATION; PHASE-SEPARATION; SINGLE-CRYSTAL; INFRARED-ABSORPTION; NEUTRON-SCATTERING; NORMAL-STATE; YBA2CU3O6+X; MAGNETISM; MODEL AB It is argued that the low-energy properties of high temperature superconductors are dominated by the interaction between the mobile holes and a particular class of collective modes, corresponding to local large-amplitude low-energy fluctuations in the hole density. The latter are a consequence of the competition between the effects of long-range Coulomb interactions and the tendency of a low concentration of holes in an antiferromagnet to phase separate. The low-energy behavior of the system is governed by the same fixed point as the two-channel Kondo problem, which accounts for the ''universality'' of the properties of the cuprate superconductors. Predictions of the optical properties and the spin dynamics are compared with experiment. The pairing resonance of the two-channel Kondo problem gives a mechanism of high temperature superconductivity with an uncoventional symmetry of the order parameter. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP EMERY, VJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 57 TC 7 Z9 7 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1499 EP 1506 DI 10.1016/0022-3697(92)90135-Z PG 8 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300005 ER PT J AU FREEMAN, AJ MUELLER, FM AF FREEMAN, AJ MUELLER, FM TI ELECTRONIC-STRUCTURE OF NOVEL SUPERCONDUCTORS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP FREEMAN, AJ (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1523 EP 1523 DI 10.1016/0022-3697(92)90138-4 PG 1 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300008 ER PT J AU BANSIL, A LINDROOS, M GOFRON, K CAMPUZANO, JC DING, H LIU, R VEAL, BW AF BANSIL, A LINDROOS, M GOFRON, K CAMPUZANO, JC DING, H LIU, R VEAL, BW TI 1ST PRINCIPLES ANGLE-RESOLVED PHOTOEMISSION INTENSITY CALCULATIONS FOR YBA2CU3O7(001)-SURFACE SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE HIGH TC SUPERCONDUCTOR; ANGLE RESOLVED PHOTOEMISSION; YBA2CU3O7; BAND STRUCTURE ID FERMI-SURFACE; ALLOYS; YBA2CU3O7-DELTA; SUPERCONDUCTOR; YBA2CU3O6.9 AB We discuss first-principles angle-resolved photoemission (ARPES) intensity calculations for the (001)-surface of YBa2Cu3O7, with focus on spectra for k(parallel-to)-values along the GAMMAS symmetry direction. The theoretical spectra show the sensitivity of the spectral shape to the specific surface termination used in the computations. The experimental spectra however appear to be well-described by assuming the first layer to be BaO followed by the CuO2 Plane layer. Effects of the direction of polarization vector of the incident light on the spectra are examined; in particular, we show that the predicted behavior of the spectral feature arising from the CuO2 plane bands is in remarkable accord with experiments. This result gives confidence in the reasonableness of the LDA wave functions implicit in the computations. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. UNIV ILLINOIS,CHICAGO,IL 60680. RP BANSIL, A (reprint author), NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115, USA. RI Campuzano, Juan Carlos/G-4358-2012; OI Ding, Hong/0000-0003-4422-9248 NR 23 TC 6 Z9 6 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1541 EP 1548 DI 10.1016/0022-3697(92)90141-Y PG 8 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300011 ER PT J AU MUELLER, FM AF MUELLER, FM TI DEHAAS-VANALPHEN EFFECT IN SUPERCONDUCTORS BELOW BC2 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE DEHAASVANALPHEN EFFECT; FERMI SURFACE; HIGH-TC SUPERCONDUCTOR AB The de Haas van Alphen effect has been investigated in YBCO recently by Fowler et al. using 100 Tesla fields and temperatures below 4.2 K. It is conclude-d that even at these fields these measurements were taken below the superconducting critical field, Bc2. Similar effects have been seen by Graebner and Robins in NbSe2 in 1976 and more recently by Mueller, Lowndes, and Arko et al. in V3Si. The implication,of such mixed state experiments is discussed. RP MUELLER, FM (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. NR 19 TC 5 Z9 5 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1549 EP 1553 DI 10.1016/0022-3697(92)90142-Z PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300012 ER PT J AU CAMPUZANO, JC GOFRON, K LIU, R DING, H VEAL, BW DABROWSKI, B AF CAMPUZANO, JC GOFRON, K LIU, R DING, H VEAL, BW DABROWSKI, B TI FERMIOLOGY OF YBA2CU4O8 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE HIGH TC SUPERCONDUCTORS; PHOTOEMISSION; FERMI SURFACE; SYMMETRY ID SUPERCONDUCTOR AB We present angle-resolved photoemission results of YBa2Cu4O8 (124). The energy distribution curves are very similar to those observed in the related compound YBa2Cu3O6.9 (123). The structure of the 124 compound is very similar to that of the 123, except that the 124 possesses two chain bands instead of one crossing the Fermi energy: This has an effect of lowering the density of states at E(F) and making the 124 compound more stable. to oxygen content. Otherwise, their observed electronic structures are very similar, including the sharp peaks at E(F) at the X and Y symmetry points, and the very sharp state at 1 eV binding energy at the S point. The states at E(F) along the GAMMA-S line exhibit the same symmetry as those in the 123, i.e. d(x)2-y2, while the states at X and Y exhibit d(xy) symmetry. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. RP CAMPUZANO, JC (reprint author), ARGONNE NATL LAB,DIV MAT SCI,9700 S CASS AV,ARGONNE,IL 60439, USA. RI Campuzano, Juan Carlos/G-4358-2012; OI Ding, Hong/0000-0003-4422-9248 NR 11 TC 10 Z9 10 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1577 EP 1581 DI 10.1016/0022-3697(92)90146-5 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300016 ER PT J AU SHEN, ZX AF SHEN, ZX TI K-DEPENDENT SUPERCONDUCTING GAP ANISOTROPY IN THE A-B-PLANE AND ITS IMPLICATIONS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article ID ANGLE-RESOLVED-PHOTOEMISSION; ELECTRONIC-STRUCTURE; BI2SR2CACU2O8; STATE AB We present angle-resolved photoemission data showing the k-dependent superconducting gap anisotropy of Bi2Sr2CaCu2O8+delta in the a-b plane. Except caveats from experimental uncertainties regarding the Bi-O states, the data is qualitatively inconsistent with the extended s-wave order parameter DELTA(k) is similar to DELTA0(cosk(x)a+cosk(y)a), but is qualitatively consistent with either d-wave order parameter DELTA(k) is similar to DELTA0(cosk(x)a-cosk(y)a) or other order parameters with mixed symmetries such as s+id. C1 STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. RP SHEN, ZX (reprint author), STANFORD UNIV,DEPT APPL PHYS,STANFORD,CA 94305, USA. NR 7 TC 8 Z9 8 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1583 EP 1587 DI 10.1016/0022-3697(92)90147-6 PG 5 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300017 ER PT J AU TANNER, DB GAO, F QUIJADA, M ROMERO, DB RICE, JP GINSBERG, DM TALVACCHIO, J FORRESTER, MG FORRO, L MANDRUS, D MIHALY, L CARR, GL WILLIAMS, GP AF TANNER, DB GAO, F QUIJADA, M ROMERO, DB RICE, JP GINSBERG, DM TALVACCHIO, J FORRESTER, MG FORRO, L MANDRUS, D MIHALY, L CARR, GL WILLIAMS, GP TI OPTICAL CONDUCTIVITY OF THE HIGH-TCS - SEARCH FOR THE ENERGY-GAP SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article ID SINGLE-DOMAIN YBA2CU3O7; CA-CU-O; DYNAMICAL CONDUCTIVITY; INFRARED ABSORPTIVITY; CRYSTALS; STATE; BI2SR2CACU2O8; SUPERCONDUCTOR; REFLECTIVITY; PLANE AB The infrared absorption of oxide superconductors will be discussed. In the normal state, sigma1(omega) consists of a strongly T-dependent part in the far infrared, above which is a weakly-T-dependent midinfrared absorption. In the superconducting state, there is absorption to very low frequencies, well below where the superconducting gap is expected to be. It is argued that this absorption is due to a second (''midinfrared'') component which is only weakly affected by the onset of superconductivity. The free carrier component is in the clean limit and most of its oscillator strength goes into the superfluid condensate zero-frequency delta function response. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. WESTINGHOUSE ELECT CORP,CTR SCI & TECHNOL,PITTSBURGH,PA 15235. SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. GRUMMAN CORP RES CTR,BETHPAGE,NY 11714. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP TANNER, DB (reprint author), UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611, USA. RI Mandrus, David/H-3090-2014 NR 37 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 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1611 EP 1618 DI 10.1016/0022-3697(92)90151-3 PG 8 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300021 ER PT J AU ZASADZINSKI, JF TRALSHAWALA, N ROMANO, P HUANG, Q CHEN, J GRAY, KE AF ZASADZINSKI, JF TRALSHAWALA, N ROMANO, P HUANG, Q CHEN, J GRAY, KE TI TUNNELING DENSITY OF STATES IN CUPRATE AND BISMUTHATE SUPERCONDUCTORS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE TUNNELING; POINT-CONTACT JUNCTIONS; HIGH TC OXIDES; ELECTRON-PHONON INTERACTION AB SIN and SIS tunnel junction characteristics in the energy gap region are reported for several superconducting oxides including Ba1-xBxBiO3 (BKBO), Nd2-xCexCuO4 (NCCO), and the 2212 and 2201 phases of the BiSrCaCuO (BSCCO) system. A pattern has emerged which suggests that the tunneling density of states of cuprates has a broadened BCS shape, but with distinctive features which cannot be explained by the addition of an imaginary term, GAMMA, to the BCS quasiparticle energy. A particular feature is a dip in the density of states at E>DELTA which, in die case of 2212 BSCCO, agrees with the dip found in photoemission data. While such features may be suggestive of a novel pairing state, we also observe structures in the high bias data of NCCO which have the characteristics of conventional phonon effects. The measured alpha2F(omega)) displays peaks and valleys which are in good agreement with F(omega) from neutron scattering. C1 ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. RP ZASADZINSKI, JF (reprint author), IIT,CHICAGO,IL 60616, USA. NR 13 TC 41 Z9 41 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1635 EP 1642 DI 10.1016/0022-3697(92)90154-6 PG 8 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300024 ER PT J AU SMEDSKJAER, LC BANSIL, A AF SMEDSKJAER, LC BANSIL, A TI 2D-ACAR SPECTRA OF INSULATING AND SUPERCONDUCTING Y-123 SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE POSITRON ANNIHILATION SPECTROSCOPY; SUPERCONDUCTIVITY; FERMI SURFACE ID POSITRON MOMENTUM DENSITY; ANGLE-RESOLVED PHOTOEMISSION; FERMI-SURFACE; ELECTRONIC-STRUCTURE; ANNIHILATION; YBA2CU3O7; SPECTROSCOPY AB An overview of the two-dimensional angular correlation (2D-ACAR) positron annilhilation results for the three fundamental phases of YBa2Cu3Ox, namely, the normal metal, the superconductor, and the insulator, is presented: In addition to the c-axis projected momentum density, the recent results for the a-axis projection as well as the insulating Y123 are discussed. The experimental results are compared and contrasted with the corresponding band theory predictions as far as possible in order to gain insight into the electronic structure and Fermiology of this archetypal high-T(c) superconductor. C1 NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115. RP SMEDSKJAER, LC (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 62 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1657 EP 1667 DI 10.1016/0022-3697(92)90157-9 PG 11 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300027 ER PT J AU EMERY, VJ AF EMERY, VJ TI ELECTRONIC-STRUCTURE AND FERMIOLOGY OF HIGH-TEMPERATURE SUPERCONDUCTORS - THEORETICAL SUMMARY SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article AB A summary of theoretical issues raised at the conference on Electronic Structure and Fermiology of High Temperature Superconductors in the context of the more general question of the role of electron correlations. RP EMERY, VJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1992 VL 53 IS 12 BP 1713 EP 1715 DI 10.1016/0022-3697(92)90164-9 PG 3 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA KE863 UT WOS:A1992KE86300034 ER PT J AU RITSCHEL, U WILETS, L REHR, JJ GRABIAK, M AF RITSCHEL, U WILETS, L REHR, JJ GRABIAK, M TI NONLOCAL DIELECTRIC FUNCTIONS IN CLASSICAL ELECTROSTATICS AND QCD MODELS SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Article ID NON-PERTURBATIVE CALCULATION; GAUGE GLUON PROPAGATOR; INFRARED LIMIT; CONFINEMENT AB In order to resolve the problem of infinite forces and renormalizability of the self-energy of point charges in non-uniform local dielectric media, we propose a formalism based on a non-local dielectric function. Implications for both solid-state physics and chromodielectric models of QCD are discussed. The formalism to calculate the energies of systems of charges is developed. The (integral) equation for the Green function is explicitly solved both for a slowly varying dielectric medium and for the planar boundary, and the results are compared with those of the local approach. In agreement with the findings of Baker and Zachariasen, we find that the generic infrared form kappa is-proportional-to k2 (k2 --> 0) causes linear confinement of opposite charges, but does not produce the usual flux-tube field configurations. C1 LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP RITSCHEL, U (reprint author), UNIV WASHINGTON,DEPT PHYS,FM-15,SEATTLE,WA 98195, USA. NR 19 TC 3 Z9 3 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0954-3899 J9 J PHYS G NUCL PARTIC JI J. Phys. G-Nucl. Part. Phys. PD DEC PY 1992 VL 18 IS 12 BP 1889 EP 1900 DI 10.1088/0954-3899/18/12/004 PG 12 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA KA880 UT WOS:A1992KA88000004 ER PT J AU ROSENTHAL, DH NELSON, RH AF ROSENTHAL, DH NELSON, RH TI WHY EXISTENCE VALUE SHOULD NOT BE USED IN COST-BENEFIT-ANALYSIS SO JOURNAL OF POLICY ANALYSIS AND MANAGEMENT LA English DT Note C1 US DEPT INTERIOR,WASHINGTON,DC 20240. RP ROSENTHAL, DH (reprint author), US DOE,WASHINGTON,DC 20585, USA. NR 15 TC 37 Z9 37 U1 1 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0276-8739 J9 J POLICY ANAL MANAG JI J. Policy Anal. Manage. PD WIN PY 1992 VL 11 IS 1 BP 116 EP 122 DI 10.2307/3325135 PG 7 WC Economics; Public Administration SC Business & Economics; Public Administration GA GY147 UT WOS:A1992GY14700007 ER PT J AU HUO, PP CEBE, P CAPEL, M AF HUO, PP CEBE, P CAPEL, M TI REAL-TIME X-RAY-SCATTERING STUDY OF THERMAL-EXPANSION OF POLY(BUTYLENE TEREPHTHALATE) SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE POLY(BUTYLENE TEREPHTHALATE); PBT; THERMAL EXPANSION; REAL-TIME X-RAY ID PARTIALLY CRYSTALLINE POLYMERS; POLY(TETRAMETHYLENE TEREPHTHALATE); POLYBUTYLENE TEREPHTHALATE; BLOCK COPOLYMERS; POLYARYLATE; BLENDS; BEHAVIOR; TRANSITION; EXTRUSION; MIXTURES AB Real-time x-ray scattering at elevated temperatures has been used to investigate the thermal expansion characteristics of poly (butylene terephthalate), PBT. Changes in the six lattice parameters of the alpha-form of PBT were obtained from wide-angle x-ray scattering over the temperature range from 35 to 215-degrees-C. The linear thermal expansion coefficients relating the unit cell parameters at temperature T to their values at 0-degrees-C are found to be a = 4.80(1 + 2.03 X 10(-4)T) alpha = 100.26(1 + 3.96 X l0(-5)T) b = 5.98(1 + 1.22 X 10(-4)T) beta = 114.82(1 + 8.13 X 10(-5)T) c = 11.55(1 + 2.13 X 10(-4)T) gamma = 111.43(1 - 3.92 X 10(-5)T). The temperature dependence of both the long period and the lamellar thickness of semi-crystalline PBT were determined from real-time small-angle x-ray scattering analysis of the one-dimensional electron density correlation function. The long period, lamellar thickness, and degree of crystallinity increase as the temperature increases. We find an average linear thermal expansion coefficient of the bulk material to be alpha(ave) = 5.0 X 10(-4)-degrees-C-1. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. RP HUO, PP (reprint author), MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139, USA. NR 50 TC 9 Z9 9 U1 2 U2 9 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD DEC PY 1992 VL 30 IS 13 BP 1459 EP 1468 DI 10.1002/polb.1992.090301305 PG 10 WC Polymer Science SC Polymer Science GA JX758 UT WOS:A1992JX75800005 ER PT J AU WANG, X BAKER, GA AF WANG, X BAKER, GA TI MONTE-CARLO CALCULATIONS OF THE CONFORMAL CHARGE SO JOURNAL OF STATISTICAL PHYSICS LA English DT Article DE MONTE-CARLO SIMULATIONS; CONFORMAL CHARGE; CENTRAL CHARGE; CONFORMAL INVARIANCE; CONTINUOUS-SPIN ISING MODEL; CRITICAL PHENOMENA; PARALLEL COMPUTERS ID SPIN ISING-MODEL; FIELD-THEORY; RENORMALIZATION-GROUP; 2 DIMENSIONS; UNIVERSALITY; INVARIANCE; SYSTEMS AB The conformal charge is an important quantity which characterizes the nature of the two-dimensional phase transition. We report a first attempt to use a new numerical method to calculate the conformal charge. In this paper, we apply our method to the 2-dimensional, phi4, continuous-spin Ising model. By varying the parameters in the Hamiltonian, one can change continuously from the known Gaussian limit to the Ising limit. It is well known that the critical points for these two systems are not in the same universality class. We study this behavior for the Gaussian model, the single-well phi4 model, the border model, and the double-well phi4 model for a large lattice. Our results, while giving a good general picture, are not so far sufficient to differentiate whether the non-Gaussian cases studied belong to the Ising model universality class or not. Further studies of other lattice sizes should serve to improve greatly our conclusions. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP WANG, X (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 27 TC 4 Z9 4 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4715 J9 J STAT PHYS JI J. Stat. Phys. PD DEC PY 1992 VL 69 IS 5-6 BP 1069 EP 1095 DI 10.1007/BF01058762 PG 27 WC Physics, Mathematical SC Physics GA KA935 UT WOS:A1992KA93500007 ER PT J AU AZMY, YY AF AZMY, YY TI PERFORMANCE AND PERFORMANCE MODELING OF A PARALLEL ALGORITHM FOR SOLVING THE NEUTRON-TRANSPORT EQUATION SO JOURNAL OF SUPERCOMPUTING LA English DT Article DE PERFORMANCE MODELING; NEUTRON TRANSPORT PROBLEM; INTEL IPSC/2; HYPERCUBE AB A parallel algorithm is derived for solving the discrete-ordinates approximation of the neutron transport equation, based on the naturally occurring decoupling between the mesh sweeps in the various discrete directions during each iteration. In addition, the parallel Source Iteration (SI) algorithm, characterized by its coarse granularity and static scheduling, is implemented for the Nodal Integral Method (NIM) into the Parallel Nodal Transport (P-NT) code on Intel's iPSC/2 hypercube. Measured parallel performance for solutions of two test problems is used as evidence of the parallel algorithm's potential for high speedup and efficiency. The measured performance data are also used to develop and validate a parallel performance model for the total, serial, parallel, and global-summation time components per iteration as a function of the spatial mesh size, the problem size (number of mesh cells and angular quadrature order), and the number of utilized processors. The potential for high performance (large speedup at high efficiency) for large problems is explored using the performance model, and it is concluded that present applications in three-dimensional Cartesian geometry will benefit by concurrent execution on parallel computers with up to a few hundred processors. RP AZMY, YY (reprint author), OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,RES STAFF,POB 2008,OAK RIDGE,TN 37831, USA. NR 22 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 0920-8542 J9 J SUPERCOMPUT JI J. Supercomput. PD DEC PY 1992 VL 6 IS 3-4 BP 211 EP 235 DI 10.1007/BF00155800 PG 25 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KU932 UT WOS:A1992KU93200002 ER PT J AU STEEPER, RR RICE, SF BROWN, MS JOHNSTON, SC AF STEEPER, RR RICE, SF BROWN, MS JOHNSTON, SC TI METHANE AND METHANOL DIFFUSION FLAMES IN SUPERCRITICAL WATER SO JOURNAL OF SUPERCRITICAL FLUIDS LA English DT Article DE SUPERCRITICAL WATER; OXIDATION; FLAMES; IGNITION; RAMAN SPECTROSCOPY ID HIGH-PRESSURES; TEMPERATURES AB Our interest in understanding supercritical-water oxidation as a process for the destruction of hazardous wastes has led us to examine hydrothermal diffusion flames that can ignite in supercritical water-fuel-oxygen mixtures. We injected pure oxy-en into water-methane and water-methanol mixtures at 275 bar, varying fuel concentrations from 1 to 50 mol % and temperatures from 380 to 510-degrees-C. Measurements of minimum fuel concentrations required for the spontaneous ignition of diffusion flames in supercritical water are reported. The flames ignite at methane or methanol concentrations as low as 6 mol % at temperatures near 500-degrees-C. The ignition-threshold concentrations rise as temperature is decreased to 400-degrees-C. Visual and shadowgraph video records reveal an insensitivity of flame height to diminishing fuel concentration. In contrast, both luminosity and average flame temperature vary strongly with fuel concentration. Flame structures are detectable long after flame luminosity is no longer visible, with measured average flame temperatures within a few hundred degrees of ambient. RP STEEPER, RR (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 20 TC 35 Z9 37 U1 0 U2 4 PU PRA PRESS PI CINCINNATI PA POLYMER RES ASSOC INC 9200 MONTGOMERY RD, SUITE 23B, CINCINNATI, OH 45242 SN 0896-8446 J9 J SUPERCRIT FLUID JI J. Supercrit. Fluids PD DEC PY 1992 VL 5 IS 4 BP 262 EP 268 DI 10.1016/0896-8446(92)90017-E PG 7 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA KL927 UT WOS:A1992KL92700006 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 DRUMHELLER, DS AF DRUMHELLER, DS TI EXTENSIONAL STRESS WAVES IN ONE-DIMENSIONAL ELASTIC WAVE-GUIDES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Computations of linear, one-dimensional wave propagation problems are often accomplished with integral transform methods. Time-domain approaches that usually involve a infinite-difference or method-of-characteristics approach have usually been reserved for nonlinear problems. However, time-domain algorithms have unique advantages for many problems with complex combinations of geometry, internal energy sources, and boundary conditions. One such algorithm will be examined in this work. It was originally developed for an unusual waveguide problem-acoustical wave transmission through drill strings that are used to drill geothermal and petrochemical wells. The development of this algorithm takes advantage of a unique property of the linear problem. The result is a computational method that is a combination of the finite-difference and characteristics methods. A variety of example problems are treated in this work. They involve linear elastic, ferroelectric, and fading-memory materials. Examples are given of solutions to the coupled mechanical and electrostatic field equations, and to problems with nonhomogeneous material properties. RP DRUMHELLER, DS (reprint author), SANDIA NATL LABS,GEOTHERMAL RES DEPT,ALBUQUERQUE,NM 87185, USA. NR 6 TC 11 Z9 18 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 3389 EP 3402 DI 10.1121/1.404189 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA KB223 UT WOS:A1992KB22300036 ER PT J AU POTTER, GE KNUDSEN, AK TOU, JC CHOUDHURY, A AF POTTER, GE KNUDSEN, AK TOU, JC CHOUDHURY, A TI MEASUREMENT OF THE OXYGEN AND IMPURITY DISTRIBUTION IN POLYCRYSTALLINE ALUMINUM NITRIDE WITH SECONDARY ION MASS-SPECTROMETRY SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID HIGH-THERMAL-CONDUCTIVITY; MICROPROBE ANALYSIS; CRYSTALS; CERAMICS AB The lattice oxygen content in sintered polycrystalline aluminum nitride substrates was measured via secondary ion mass spectrometry (SIMS). This was achieved by quantitative analysis of spatial and depth-resolved ion images of polished. specimens using the solid-state standard addition method. The thermal conductivity of the polycrystalline material, measured with the laser flash technique, was found to be strongly correlated with the oxygen content in the AlN grains. This dependence is similar to that observed in single-crystal studies and is consistent with the phonon scattering model of AlN thermal conductivity. Scanning electron microscopy and SIMS images of a variety of other species (C, F, Cl, Y, Si, and Ca) were also obtained. In general, impurities were localized within second-phase regions although calcium was also found to be distributed uniformly along AlN grain boundaries. Other impurity constituents are also discussed. C1 OAK RIDGE NATL LAB,HIGH TEMP MAT LAB,OAK RIDGE,TN 37831. RP POTTER, GE (reprint author), DOW CHEM CO USA,MIDLAND,MI 48664, USA. NR 22 TC 13 Z9 13 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 DEC PY 1992 VL 75 IS 12 BP 3215 EP 3224 DI 10.1111/j.1151-2916.1992.tb04414.x PG 10 WC Materials Science, Ceramics SC Materials Science GA KC291 UT WOS:A1992KC29100004 ER PT J AU BUTT, DP TRESSLER, RE SPEAR, KE AF BUTT, DP TRESSLER, RE SPEAR, KE TI CORROSION OF SIC MATERIALS IN N2-H2-CO GASEOUS ENVIRONMENTS .1. THERMODYNAMICS AND KINETICS OF REACTIONS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID SILICON; EQUILIBRIA; IRON; GAS AB Two sintered SiC materials and a siliconized SiC material were exposed to two gas compositions in the N2-H2-CO system at 1000-degrees-1350-degrees-C, 133 Pa and 98.7 kPa for 8-1000 h. The two gases were a nitrogen-based gas which contained 98.2% N2,1.2% H-2, and 0.6% CO; and an endothermic gas which contained 37.8% N2, 41.1% H-2, and 21.1% CO by volume. Thermodynamics of reactions were modeled using the program SOLGASMIX. Kinetic studies were based on weight change measurements obtained from vacuum TGA and long-term tube-furnace experiments. In the case of a siliconized SiC, reactions were complex, owing to its two-phase composition and to the presence of impurities. Under many conditions, silicon was rapidly etched from the surface of the siliconized SiC during a short initial period due to the formation of SiO and carbon or SiO and beta-SiC. In the case of sintered materials (and the siliconized material during the later stages of corrosion), etching of SiC was observed under many of the conditions studied, due to the apparent formation of SiO, HCN, and/or carbon. Corrosion in an endothermic gas was typically more severe than in a nitrogen-based gas, due to its higher p(CO). C1 PENN STATE UNIV,CTR ADV MAT,UNIV PK,PA 16802. RP BUTT, DP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. RI Butt, Darryl/B-7480-2008 OI Butt, Darryl/0000-0003-4501-8864 NR 26 TC 17 Z9 17 U1 0 U2 5 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 DEC PY 1992 VL 75 IS 12 BP 3257 EP 3267 DI 10.1111/j.1151-2916.1992.tb04419.x PG 11 WC Materials Science, Ceramics SC Materials Science GA KC291 UT WOS:A1992KC29100009 ER PT J AU BUTT, DP TRESSLER, RE SPEAR, KE AF BUTT, DP TRESSLER, RE SPEAR, KE TI CORROSION OF SIC MATERIALS IN N2-H2-CO GASEOUS ENVIRONMENTS .2. DURABILITY AND MECHANICAL-PROPERTIES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID STRENGTH; GAS AB Three SiC materials were exposed to two gas compositions in the N2-H2-CO system at 1200-degrees and 1300-degrees-C, 133 Pa and 98.7 kPa for 50-1000 h. The durability was evaluated by fracturing bend bars at room temperature and C-rings at room temperature and 1300-degrees-C in argon. Fractography was used to correlate changes in strength with changes in flaw populations. In all three materials, surface pitting was the primary cause of degradation. Under some conditions it was found that flaw healing and new flaw formation occurred simultaneously. C-rings cut from tubes did not lose strength, although pitting occurred; however, machined bend bars lost strength under identical conditions. In the case of bend bars, following an initial loss of strength (approximately 10%-50%) after 50-150 h, there was typically no further loss observed with increased exposure time. Due to its higher P(CO), degradation in an endothermic gas was generally more severe than that in a nitrogen-based gas. C1 PENN STATE UNIV,CTR ADV MAT,UNIV PK,PA 16802. RP BUTT, DP (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. RI Butt, Darryl/B-7480-2008 OI Butt, Darryl/0000-0003-4501-8864 NR 24 TC 13 Z9 13 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 DEC PY 1992 VL 75 IS 12 BP 3268 EP 3277 DI 10.1111/j.1151-2916.1992.tb04420.x PG 10 WC Materials Science, Ceramics SC Materials Science GA KC291 UT WOS:A1992KC29100010 ER PT J AU JOHNSTON, GP MUENCHAUSEN, R SMITH, DM FAHRENHOLTZ, W FOLTYN, S AF JOHNSTON, GP MUENCHAUSEN, R SMITH, DM FAHRENHOLTZ, W FOLTYN, S TI REACTIVE LASER ABLATION SYNTHESIS OF NANOSIZE ALUMINA POWDER SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID CLUSTERS AB An aluminum (Al) target was laser ablated in an oxygen (O2) atmosphere, producing nanosize alumina (Al2O3) powder. The powder surface area decreased (and the particle size increased) with both increasing oxygen pressure and laser fluence. All powders produced had surface areas between 135 and 250 m2/g, corresponding to primary particle sizes ranging from 7 to 3 nm in radius. Phase evolution with temperature was studied via X-ray diffraction. These powders showed a direct transformation from gamma- to alpha-alumina at approximately 1200-degrees-C, bypassing other transition alumina phases, while still maintaining small particle size (< 30 nm). Despite the nanosize particles, green densities equal to 54% of the skeletal density (i.e., true density of the solid phase) were obtained by uniaxial pressing at 40 MPa. C1 LOS ALAMOS NATL LAB, CTR EXPLORATORY RES & DEV, LOS ALAMOS, NM 87545 USA. RP SMITH, DM (reprint author), UNIV NEW MEXICO, NSF, CTR MICROENGINEERED CERAM, ALBUQUERQUE, NM 87131 USA. NR 18 TC 62 Z9 63 U1 1 U2 7 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD DEC PY 1992 VL 75 IS 12 BP 3293 EP 3298 DI 10.1111/j.1151-2916.1992.tb04424.x PG 6 WC Materials Science, Ceramics SC Materials Science GA KC291 UT WOS:A1992KC29100014 ER PT J AU BERGSTROM, L SCHILLING, CH AKSAY, IA AF BERGSTROM, L SCHILLING, CH AKSAY, IA TI CONSOLIDATION BEHAVIOR OF FLOCCULATED ALUMINA SUSPENSIONS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID PARTICLE PACKING; SEDIMENTATION; FILTRATION; FORCES AB The consolidation behavior of flocculated alumina suspensions has been analyzed as a function of the interparticle energy. Consolidation was performed by a centrifugal force field or by gravity, and both the time-dependent and equilibrium density profiles were measured by a gamma-ray absorption technique. The interparticle energy at contact was controlled by adsorbing fatty acids of varying molecular weight at the alumina/decalin interface. We found that strongly attractive interactions result in a particle network which resists consolidation and shows compressible behavior over a large stress range. The most weakly flocculated suspension showed an essentially incompressible, homogeneous density profile after consolidation at different centrifugal speeds. We also found a significant variation in the maximum volume fraction, phi(m), obtained, with phi(m) almost-equal-to 0.54 for the most strongly flocculated suspension to phi(m) almost-equal-to 0.63 for the most weakly flocculated suspension. The compressive yield stresses show a behavior which can be fitted to a modified power law. In this paper, we discuss possible correlations between the fitting parameters and physical properties of the flocculated suspensions. C1 UNIV WASHINGTON, DEPT MAT SCI & ENGN, SEATTLE, WA 98195 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP BERGSTROM, L (reprint author), INST SURFACE CHEM, POB 5607, S-11486 STOCKHOLM, SWEDEN. RI Aksay, Ilhan/B-9281-2008; Bergstrom, Lennart/F-2938-2011 OI Bergstrom, Lennart/0000-0002-5702-0681 NR 44 TC 166 Z9 166 U1 0 U2 19 PU WILEY-BLACKWELL PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD DEC PY 1992 VL 75 IS 12 BP 3305 EP 3314 DI 10.1111/j.1151-2916.1992.tb04426.x PG 10 WC Materials Science, Ceramics SC Materials Science GA KC291 UT WOS:A1992KC29100016 ER PT J AU PLOVNICK, RH KIGGANS, JO AF PLOVNICK, RH KIGGANS, JO TI MICROWAVE THERMAL ETCHING OF STABILIZED ZIRCONIA SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note AB A method is discussed for etching stabilized zirconia using microwave heating. Microstructural features of microwave-sintered stabilized zirconia are revealed by this technique. This approach requires less time at temperature than conventional thermal etching to achieve comparable results. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP PLOVNICK, RH (reprint author), THREE M CO,CTR CERAM TECHNOL,ST PAUL,MN 55144, USA. RI kiggans, james/E-1588-2017 OI kiggans, james/0000-0001-5056-665X NR 11 TC 0 Z9 0 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 DEC PY 1992 VL 75 IS 12 BP 3462 EP 3464 DI 10.1111/j.1151-2916.1992.tb04450.x PG 3 WC Materials Science, Ceramics SC Materials Science GA KC291 UT WOS:A1992KC29100040 ER PT J AU JOHNSTON, GP MUENCHAUSEN, RE SMITH, DM FOLTYN, SR AF JOHNSTON, GP MUENCHAUSEN, RE SMITH, DM FOLTYN, SR TI REACTIVE LASER ABLATION SYNTHESIS OF NANOSIZE ALUMINUM NITRIDE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID POWDER AB An aluminum (Al) target was laser ablated in a nitrogen (N2) atmosphere, producing aluminum nitride (AlN) powder. These powders were calcined at 900-degrees-C for 2 h. Powders were produced at various nitrogen pressures, and the calcined powders were tested for unreacted aluminum content, using differential thermal analysis (DTA). The AlN powder, produced at a laser fluence of 12 J/cm2 and a nitrogen pressure of 10.0 kPa (75 torr), showed no evidence of unreacted aluminum by DTA and was phase-pure AlN by X-ray diffraction (XRD). The surface area of this powder is 82 m2/g, corresponding to a particle size of approximately 11 nm, which is in good agreement with TEM observations. C1 UNIV NEW MEXICO,NSF CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,CTR SUPERCONDUCT TECHNOL,LOS ALAMOS,NM 87545. RP SMITH, DM (reprint author), UNIV NEW MEXICO,NSF CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131, USA. NR 16 TC 27 Z9 28 U1 0 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD DEC PY 1992 VL 75 IS 12 BP 3465 EP 3468 DI 10.1111/j.1151-2916.1992.tb04451.x PG 4 WC Materials Science, Ceramics SC Materials Science GA KC291 UT WOS:A1992KC29100041 ER PT J AU TAI, LW ANDERSON, HU LESSING, PA AF TAI, LW ANDERSON, HU LESSING, PA TI MIXED-CATION OXIDE POWDERS VIA RESIN INTERMEDIATES DERIVED FROM A WATER-SOLUBLE POLYMER SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note AB Submicrometer powders of complex oxides were prepared via resin intermediates based on a starch type of organic precursor. A commercially available water-soluble starch derivative was (for the first time) used as the organic base for solution synthesis of ceramic powders. Calcination of the charred, fluffy, amorphous resins at a temperature below 600-degrees-C for 4 h yielded perovskite powders of Sr-doped LaMnO3 and Sr-doped La(Fe,Co)O3. Sr-doped LaCrO3 needed to be calcined above 750-degrees-C to ensure phase purity and to remove organic residue. Due to the low cost of starch derivatives, the process has the potential of being more economical than the commonly used Pechini's type process, which utilizes citric acid and ethylene glycol. C1 IDAHO NATL ENGN LAB,CERAM SECT,IDAHO FALLS,ID 83415. RP TAI, LW (reprint author), UNIV MISSOURI,DEPT CERAM ENGN,ROLLA,MO 65401, USA. NR 12 TC 20 Z9 21 U1 1 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD DEC PY 1992 VL 75 IS 12 BP 3490 EP 3494 DI 10.1111/j.1151-2916.1992.tb04458.x PG 5 WC Materials Science, Ceramics SC Materials Science GA KC291 UT WOS:A1992KC29100048 ER PT J AU PRADEEP, T SINGH, KK SINHA, APB MORRIS, DE AF PRADEEP, T SINGH, KK SINHA, APB MORRIS, DE TI A STABLE FULLERENE CHARGE-TRANSFER COMPLEX IN THE SOLID-STATE - HMTTEF-C60 SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article AB The first stable complex of C60 with an organic electron donor has been synthesised; the complex, having C60 and HMTTEF (hexamethylenetetratellurafulvalene) in a 1 : 1 ratio, is black, insulating, weakly magnetic, insoluble in most solvents and stable in air, C1 UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720. MORRIS RES INC,BERKELEY,CA 94704. RP PRADEEP, T (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 5 TC 35 Z9 35 U1 0 U2 1 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD DEC 1 PY 1992 IS 23 BP 1747 EP 1748 DI 10.1039/c39920001747 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA KA691 UT WOS:A1992KA69100027 ER PT J AU TOMCZUK, Z ACKERMAN, JP WOLSON, RD MILLER, WE AF TOMCZUK, Z ACKERMAN, JP WOLSON, RD MILLER, WE TI URANIUM TRANSPORT TO SOLID ELECTRODES IN PYROCHEMICAL REPROCESSING OF NUCLEAR-FUEL SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB A unique pyrochemical process is being developed for separation of metallic nuclear fuel from fission products by electrotransport through molten LiCl-KCl eutectic salt to solid and liquid metal cathodes. The process will allow recovery and reuse of essentially all of the actinides in spent fuel from the integral fast reactor (IFR) and disposal of wastes in satisfactory forms. Electrotransport is used to minimize reagent consumption and, consequently, waste volume. In particular, electrotransport to solid cathodes is used for recovery of an essentially pure uranium product in the presence of other actinides; removal of pure uranium is used to adjust the electrolyte composition in preparation for recovery of a plutonium-rich mixture with uranium in liquid cadmium cathodes. This paper presents (i) experiments that delineate the behavior of key actinide and rare-earth elements during electrotransport to a solid electrode over a useful range of PuCl3/UCl3 ratios in the electrolyte, (ii) a thermodynamic basis for that behavior, and (iii) a comparison of the observed behavior with that calculated from a thermodynamic model. This work clearly establishes that recovery of nearly pure uranium can be a key step in the overall pyrochemical-fuel-processing strategy for the IFR. RP TOMCZUK, Z (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 15 TC 40 Z9 42 U1 0 U2 9 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 3523 EP 3528 DI 10.1149/1.2069109 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA KC336 UT WOS:A1992KC33600029 ER PT J AU BERMAN, SM AF BERMAN, SM TI ENERGY EFFICIENCY CONSEQUENCES OF SCOTOPIC SENSITIVITY SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article AB Experiments have demonstrated that rod receptors are important in determining pupil size, and in perceiving the brightness of white light at typical interior light levels. These new findings may explain the confusing results of some previous studies, and suggest that scotopically enriched sources can lead to major energy savings. RP BERMAN, SM (reprint author), LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,LIGHTING SYST RES GRP,BERKELEY,CA 94720, USA. NR 0 TC 39 Z9 39 U1 0 U2 8 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD WIN PY 1992 VL 21 IS 1 BP 3 EP 14 PG 12 WC Optics SC Optics GA KB890 UT WOS:A1992KB89000001 ER PT J AU CLEAR, R BERMAN, SM AF CLEAR, R BERMAN, SM TI POLARIZATION AND GLARE ON VDUS AND OTHER TILTED SPECULAR SURFACES SO JOURNAL OF THE ILLUMINATING ENGINEERING SOCIETY LA English DT Article AB The reflectivity of polarized light depends upon its orientation with respect to the reflecting surface. A formula for computing the reflectivity for an arbitrary surface orientation is derived. This formula is then used to compare the reflected glare of polarized and unpolarized light from tilted surfaces such as VDUs. RP CLEAR, R (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ILLUMINAT ENG SOC NORTH AMER PI NEW YORK PA 120 WALL ST, 17TH FL, NEW YORK, NY 10005-4001 SN 0099-4480 J9 J ILLUM ENG SOC JI J. Illum. Eng. Soc. PD WIN PY 1992 VL 21 IS 1 BP 29 EP 40 PG 12 WC Optics SC Optics GA KB890 UT WOS:A1992KB89000004 ER PT J AU MULHOLLAND, PJ ROSEMOND, AD AF MULHOLLAND, PJ ROSEMOND, AD TI PERIPHYTON RESPONSE TO LONGITUDINAL NUTRIENT DEPLETION IN A WOODLAND STREAM - EVIDENCE OF UPSTREAM DOWNSTREAM LINKAGE SO JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY LA English DT Article DE STREAM PERIPHYTON; NUTRIENTS; PHOSPHORUS; PHOSPHATASE; PRIMARY PRODUCTIVITY; UPSTREAM DOWNSTREAM LINKAGE; LONGITUDINAL GRADIENTS AB Longitudinal gradients in streamwater nutrient concentrations in Walker Branch are generated as a result of instream nutrient uptake and spatially confined groundwater inputs during the period from November to May. The response of the stream periphyton community to these longitudinal nutrient reductions was determined by measuring periphyton biomass, productivity, species composition, and phosphorus (P) cycling indices at four stations along a longitudinal transect in the stream. Phosphorus cycling indices (chlorophyll-specific phosphatase activity, phosphorus content of periphyton) exhibited significant changes along the longitudinal transect during those times of the year when streamwater soluble reactive phosphorus (SRP) concentrations also decreased along the transect. During the period from June to October, however, neither streamwater phosphorus concentrations nor phosphorus cycling characteristics exhibited longitudinal trends. Regressions between phosphatase activity and streamwater SRP concentration and between phosphorus content and streamwater SRP were highly significant for all data combined, with SRP explaining greater-than-or-equal-to 74% of the variation in phosphatase activity and P content. Measures of periphyton biomass (chlorophyll a, total biovolume), and productivity (areal carbon fixation rate, chlorophyll-specific carbon fixation rate) exhibited no consistent longitudinal patterns, even during the period of longitudinal streamwater phosphorus depletion. Regressions between productivity measures and streamwater SRP concentration for all data combined were significant, but SRP explained less-than-or-equal-to 56% of the variation in productivity. Periphyton biomass and productivity at all stations along the longitudinal transect appear to be maintained at low levels by high and longitudinally uniform rates of herbivory throughout the year. Algal species composition exhibited some response to longitudinal nutrient depletion. The biovolume and percentage of the blue-green alga Chamaesiphon investiens increased and the percentage of the chlorophyte Stigeoclonium sp. declined longitudinally when nutrients also declined. Our results demonstrate an upstream-downstream biotic linkage in Walker Branch. We show that instream nutrient uptake can reduce the concentrations of nutrients in stream water and thereby influence the structure and functioning of downstream periphyton communities. However, increases in nutrient cycling in response to lower streamwater concentrations can partially compensate for nutrient depletion by upstream organisms, thereby buffering primary productivity in downstream periphyton communities from changes in nutrient supply. RP MULHOLLAND, PJ (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Mulholland, Patrick/C-3142-2012 NR 0 TC 60 Z9 62 U1 1 U2 9 PU NORTH AMER BENTHOLOGICAL SOC PI LAWRENCE PA 1041 NEW HAMSPHIRE STREET, LAWRENCE, KS 66044 SN 0887-3593 J9 J N AM BENTHOL SOC JI J. N. Am. Benthol. Soc. PD DEC PY 1992 VL 11 IS 4 BP 405 EP 419 DI 10.2307/1467561 PG 15 WC Ecology; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA KE173 UT WOS:A1992KE17300006 ER PT J AU HILL, WR WEBER, SC STEWART, AJ AF HILL, WR WEBER, SC STEWART, AJ TI FOOD LIMITATION OF 2 LOTIC GRAZERS - QUANTITY, QUALITY, AND SIZE-SPECIFICITY SO JOURNAL OF THE NORTH AMERICAN BENTHOLOGICAL SOCIETY LA English DT Article DE FOOD LIMITATION; GRAZERS; SNAILS; ELIMIA; NEOPHYLAX; GROWTH; PERIPHYTON; LEAVES; SIZE; LIPIDS AB A food augmentation experiment demonstrated that growth and lipid accumulation by grazing snails (Elimia clavaeformis) and caddisflies (Neophylax etnieri) from a snail-dominated stream in eastern Tennessee were strongly food limited. Elimia (two size classes) and third-instar Neophylax from White Oak Creek were given one of four diets in laboratory streams: (1) low-biomass periphyton (from White Oak Creek), (2) high-biomass periphyton (from an unshaded, nutrient-enriched stream that lacked effective grazers), (3) low-biomass periphyton and leaves, and (4) high-biomass periphyton and leaves. Small Elimia grew 2x faster and large Elimia grew 5x faster on high-biomass periphyton than on their normal diet of low-biomass periphyton. Neophylax grew 7x faster on the high-biomass periphyton. The high-biomass periphyton also produced significantly higher ratios of lipid to ash-free dry mass for both grazers. Leaf additions did not increase growth or lipid accumulation, even for Elimia, a feeding generalist. Measurements of grazer growth in situ closely matched those obtained on low-biomass periphyton in the laboratory, indicating few laboratory artifacts. The degree of Elimia's food limitation was size-specific: growth stimulation by high-biomass periphyton was much more pronounced for large snails than for small snails, and large snails had lower lipid reserves after feeding on low-biomass periphyton than did small snails. Food limitation appears to be a chronic condition for grazers in streams like White Oak Creek, where grazer biomass is high and primary production is low. RP HILL, WR (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. OI stewart, arthur/0000-0003-1968-5997 NR 0 TC 26 Z9 27 U1 2 U2 5 PU NORTH AMER BENTHOLOGICAL SOC PI LAWRENCE PA 1041 NEW HAMSPHIRE STREET, LAWRENCE, KS 66044 SN 0887-3593 J9 J N AM BENTHOL SOC JI J. N. Am. Benthol. Soc. PD DEC PY 1992 VL 11 IS 4 BP 420 EP 432 DI 10.2307/1467562 PG 13 WC Ecology; Marine & Freshwater Biology SC Environmental Sciences & Ecology; Marine & Freshwater Biology GA KE173 UT WOS:A1992KE17300007 ER PT J AU CHURCH, DA DRUETTA, M DUNFORD, R LIU, CJ FROESEFISCHER, C IDREES, M UMAR, VM AF CHURCH, DA DRUETTA, M DUNFORD, R LIU, CJ FROESEFISCHER, C IDREES, M UMAR, VM TI COLLISION SPECTROSCOPY OF LOW-ENERGY-BEAM U5+ IONS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID ELECTRON-CAPTURE AB The sixth spectrum of uranium (U VI) between 80 and 115 nm is studied by observation of transitions following low-energy electron capture by a U6+-ion beam in a H-2 gas target. Emission cross sections of several identified transitions are obtained, the energy dependence investigated, and the spectra compared with the predictions of single-configuration Dirac-Fock (SCDF) calculations. Based on tentative identifications, a Rydberg-Ritz parameterization yields a predicted ionization potential only 0.3% above the SCDF result. C1 UNIV ST ETIENNE,TRAITEMENT SIGNAL & INSTRUMENTAT LAB,CNRS,UA 842,F-42100 ST ETIENNE,FRANCE. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. VANDERBILT UNIV,DEPT COMP SCI,NASHVILLE,TN 37235. SE LOUISIANA STATE UNIV,DEPT PHYS & CHEM,HAMMOND,LA 70402. RP CHURCH, DA (reprint author), TEXAS A&M UNIV SYST,DEPT PHYS,COLL STN,TX 77843, USA. NR 5 TC 1 Z9 1 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD DEC PY 1992 VL 9 IS 12 BP 2159 EP 2162 DI 10.1364/JOSAB.9.002159 PG 4 WC Optics SC Optics GA KD647 UT WOS:A1992KD64700003 ER PT J AU LINDSAY, RH HILL, JB GAITAN, E COOKSEY, RC JOLLEY, RL AF LINDSAY, RH HILL, JB GAITAN, E COOKSEY, RC JOLLEY, RL TI ANTITHYROID EFFECTS OF COAL-DERIVED POLLUTANTS SO JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH LA English DT Article ID ENVIRONMENTAL GOITROGENS; INVITRO AB Endemic goiter in iodide-sufficient areas of the United States and Colombia has been linked to watersheds rich in coal and shale, which several reports suggest are the source of water-borne goitrogens. In this report the potential antithyroid activities of aqueous coal and shale extracts and of compounds identified in aqueous effluents from coal conversion processes were assayed in thyroid peroxidase (TPO) and thyroid slice systems. Aqueous extracts of coal and black shale were potent inhibitors of TPO or I-125 organification by thyroid slices. The most abundant water-soluble compounds derived from coal are dihydroxyphenols, thiocyanate, disulfides, and hydroxypyridines. The dihydroxyphenols resorcinol, 2-methylresorcinol, and 5-methylresorcinol (orcinol) were 26.7, 22.5, and 7.2 times more potent, respectively, than the antithyroid drug 6-propylthiouracil (PTU). Other dihydroxyphenols and thiocyanate were less potent but comparable in activity to PTU. All dihydroxypyridines and 3-hydroxypyridine produced inhibitory effects comparable to PTU. None of the disulfides inhibited TPO. The antiperoxidase effects of combinations of two dihydroxyphenols or one dihydroxyphenol and SCN were additive, whereas the effects of a combination of four dihydroxyphenols at threshold inhibitory concentrations were synergistic, resulting in net effects equivalent to or greater than the sum of the individual effects. Thus, antithyroid effects may be greatly amplified by exposure to multiple coal-derived goitrogens and could be many times that produced by any one of the contributing pollutants. These results demonstrate that potent water-borne goitrogens are derived from coal and shale and that their contamination of water supplies could pose a serious threat of thyroid disorders. C1 VET AFFAIRS MED CTR,ENDOCRINOL SECT 151,1500 E WOODROW WILSON DR,JACKSON,MS 39216. VET AFFAIRS MED CTR,BIRMINGHAM,AL. UNIV MISSISSIPPI,MED CTR,SCH MED,DEPT MED,JACKSON,MS 39216. OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37830. RP GAITAN, E (reprint author), VET AFFAIRS MED CTR,ENDOCRINOL SECT 151,1500 E WOODROW WILSON DR,JACKSON,MS 39216, USA. RI Ain, Kenneth/A-5179-2012 OI Ain, Kenneth/0000-0002-2668-934X NR 39 TC 9 Z9 10 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0098-4108 J9 J TOXICOL ENV HEALTH JI J. Toxicol. Environ. Health PD DEC PY 1992 VL 37 IS 4 BP 467 EP 481 PG 15 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA KD147 UT WOS:A1992KD14700001 PM 1281508 ER PT J AU THRALL, KD SAUER, RL BULL, RJ AF THRALL, KD SAUER, RL BULL, RJ TI EVIDENCE OF THYROXINE FORMATION FOLLOWING IODINE ADMINISTRATION IN SPRAGUE-DAWLEY RATS SO JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH LA English DT Article AB Iodine (I2) has been proposed to be used as a water disinfectant on the manned space station. Previous work has shown that subchronic administration of I2 to Sprague-Dawley rats in drinking water significantly increases plasma thyroxine/triiodothyronine (T4/T3) levels. This is not observed with iodide (I-) treatment. The present study addresses the possibility that I2 reacts with deiodinated T4 metabolites in the gastrointestinal tract to resynthesize T4. Incubation of diiodothyronine (T2), T3, or reverse T3 with I2 in phosphate-buffered saline resulted in the formation of T4 as measured by radioimmunoassay. Washes from the initial segments of the small intestine of the rat show that substrates are present that react with I2 to produce T4. Single oral doses of I2 to rats produced significant dose-related increases in serum T4 and decreases in T3 concentrations after 2 h. Administration of an equivalent dose of I- did not alter significantly plasma T4 concentrations. Higher concentrations of a radioactive substance that bound a T4-specific antibody are present in plasma of animals treated with I-125(2) compared to I-125-. These data support the hypothesis that I2 reacts with metabolites of thyroid hormone in the gastrointestinal tract to resynthesize T4 and elevate its levels in blood. C1 WASHINGTON STATE UNIV,COLL PHARM,PHARMACOL TOXICOL GRAD PROGRAM,PULLMAN,WA 99164. NASA,LYNDON B JOHNSON SPACE CTR,DIV SPACE & LIFE SCI,HOUSTON,TX 77058. RP THRALL, KD (reprint author), BATTELLE PNL,DEPT HLTH PHYS K354,POB 999,RICHARD,WA 99352, USA. NR 22 TC 9 Z9 9 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0098-4108 J9 J TOXICOL ENV HEALTH JI J. Toxicol. Environ. Health PD DEC PY 1992 VL 37 IS 4 BP 535 EP 548 PG 14 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA KD147 UT WOS:A1992KD14700006 PM 1464908 ER PT J AU HAYTER, JB AF HAYTER, JB TI A SELF-CONSISTENT THEORY OF DRESSED MICELLES SO LANGMUIR LA English DT Article ID ION BINDING; CHARGE AB The dressed micelle model of Evans, Mitchell, and Ninham is recast in self-consistent form and solved analytically. Consideration of the adsorption excess of ions about the micelle leads to a remarkably simple expression for the degree of micellar ionization. Values calculated from this theory, which has no free parameters, generally agree well with experimental values measured by neutron scattering. RP HAYTER, JB (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,POB 2009,OAK RIDGE,TN 37831, USA. NR 11 TC 92 Z9 93 U1 1 U2 10 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 2873 EP 2876 DI 10.1021/la00048a005 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA KE137 UT WOS:A1992KE13700004 ER PT J AU SNOOK, IK HAYTER, JB AF SNOOK, IK HAYTER, JB TI STATIC STRUCTURE OF STRONGLY INTERACTING COLLOIDAL PARTICLES SO LANGMUIR LA English DT Article ID LIGHT-SCATTERING; NEUTRON-SCATTERING; SIMPLE-MODEL; DISPERSIONS; SUSPENSIONS; MICELLES; MSA AB We show that in order to use or even to test the accuracy of rescaled mean spherical approximation (RMSA) model of the structure of colloidal dispersions, one must take into account the penetrating background (PB) inherent in the use of the mean spherical model applied to the one-component macrofluid model (OCM) of colloidal dispersions. This can be done analytically and no major modifications of computer programs nor of analyses of experimental data need be made. All that is needed is a reinterpretation of the parameters obtained from such studies. Furthermore, for typical systems of strongly in colloidal particles we show by comparison with machine-generated values that the RMSA with PB gives extremely accurate results. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP SNOOK, IK (reprint author), ROYAL MELBOURNE INST TECHNOL,DEPT APPL PHYS,MELBOURNE,VIC 3001,AUSTRALIA. RI snook, ian/A-3427-2009 NR 27 TC 22 Z9 22 U1 1 U2 5 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 2880 EP 2884 DI 10.1021/la00048a007 PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA KE137 UT WOS:A1992KE13700006 ER PT J AU BERGERON, V RADKE, CJ AF BERGERON, V RADKE, CJ TI EQUILIBRIUM MEASUREMENTS OF OSCILLATORY DISJOINING PRESSURES IN AQUEOUS FOAM FILMS SO LANGMUIR LA English DT Article ID SODIUM DODECYL-SULFATE; ANIONIC SURFACTANT SOLUTIONS; THIN-FILMS; STRATIFICATION; STABILITY; HYDRATION; FORCES; PHASE; BLACK; MODEL AB Disjoining pressure isotherms are measured for single, isolated foam films stabilized with sodium dodecyl sulfate above the critical micelle concentration (cmc). The measured isotherms exhibit an equilibrium oscillatory component that extends out to film thicknesses as large as 50 nm. The oscillations originate from surfactant structuring within the film and are responsible for the multiple black films extensively studied by Perrin in 1918. We find that as film thickness decreases, the slopes and peak heights Of the oscillations increase for each subsequent black film encountered. The discrete changes in film thickness observed at each black film transition range from 6 to 10 nm and are a function of the ionic strength and surfactant concentration. Pressures required to rupture the multiple black films are several orders of magnitude lower than the final film-rupture pressure. Finally, the oscillatory form of the disjoining pressure permits quantitative interpretation of the stepwise thinning behavior observed in films containing surfactant above the cmc. C1 LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 49 TC 268 Z9 269 U1 1 U2 24 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 3020 EP 3026 DI 10.1021/la00048a028 PG 7 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA KE137 UT WOS:A1992KE13700027 ER PT J AU BERGERON, V JIMENEZLAGUNA, AI RADKE, CJ AF BERGERON, V JIMENEZLAGUNA, AI RADKE, CJ TI HOLE FORMATION AND SHEETING IN THE DRAINAGE OF THIN LIQUID-FILMS SO LANGMUIR LA English DT Article ID FOAM FILMS; SURFACTANT AB Foam, emulsion, and pseudoemulsion films stabilized by surfactants above the critical micelle concentration exhibit pronounced stepwise thinning or stratification. Dynamic removal of a layer is initiated by the formation and subsequent sheeting of a hole (or holes) at each step of the stratified thinning. We outline a nonlinear hydrodynamic stability analysis which successfully models the dynamics of hole formation and sheeting by accounting for an equilibrium oscillatory structural component in the disjoining pressure isotherm. Initiation of a hole is attributed to the nonlinear growth of a hydrodynamic instability during film thinning under the action of a constant capillary pressure and an oscillatory disjoining pressure. Subsequent growth or sheeting of the hole is explained by outward fluid flow within the inhomogeneous thin film as radial pressure gradients develop from curvature variations and viscous resistance to flow. Qualitative comparison is made between the proposed hydrodynamic theory and experimental observations of thinning events and rates. C1 LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 32 TC 60 Z9 60 U1 0 U2 5 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 3027 EP 3032 DI 10.1021/la00048a029 PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA KE137 UT WOS:A1992KE13700028 ER PT J AU HAWLEY, N LESHT, BM AF HAWLEY, N LESHT, BM TI SEDIMENT RESUSPENSION IN LAKE ST-CLAIR SO LIMNOLOGY AND OCEANOGRAPHY LA English DT Article ID SUSPENDED SEDIMENT; CONTINENTAL-SHELF; PARTICLE-SIZE; COMBINED WAVE; SHALLOW LAKE; WIND; TRANSPORT; EROSION; BOTTOM; STORMS AB Time-series measurements of water transparency, wave conditions, and current spee at several different sites in Lake St. Clair during five different 1-month periods in 1985 and 1986. Observed changes in suspended sediment concentration were modeled with a simple zero-dimensional, spatially averaged, mass balance model in which local bottom erosion was expressed as a linear function of the bottom shear stress. Estimates of the three parameters required by the model (particle settling velocity, resuspension concentration, and background suspended material concentration) are reasonably consistent for the various data sets, suggesting that the properties of the lake bottom do not change significantly through either space or time. The modeled settling velocities agree with the observed suspended particle size data and the erosion rates are comparable to laboratory results for freshwater sediments. The results show that a simple mass flux model can be used to model local sediment resuspension events in Lake St. Clair with reasonable accuracy. C1 ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. RP HAWLEY, N (reprint author), NOAA,GREAT LAKES ENVIRONM RES LAB,ANN ARBOR,MI 48105, USA. NR 23 TC 44 Z9 48 U1 0 U2 1 PU AMER SOC LIMNOLOGY OCEANOGRAPH PI LAWRENCE PA 810 EAST 10TH ST, LAWRENCE, KS 66044-8897 SN 0024-3590 J9 LIMNOL OCEANOGR JI Limnol. Oceanogr. PD DEC PY 1992 VL 37 IS 8 BP 1720 EP 1737 PG 18 WC Limnology; Oceanography SC Marine & Freshwater Biology; Oceanography GA KR737 UT WOS:A1992KR73700011 ER PT J AU KAHLON, TS SHORE, VG LINDGREN, FT AF KAHLON, TS SHORE, VG LINDGREN, FT TI HETEROGENEITY OF MOLECULAR-WEIGHT AND APOLIPOPROTEINS IN LOW-DENSITY LIPOPROTEINS OF HEALTHY-HUMAN MALES SO LIPIDS LA English DT Note ID AMINO-ACID SEQUENCE; HUMAN-PLASMA; B GENE; HYPOBETALIPOPROTEINEMIA; ULTRACENTRIFUGATION; SUBFRACTIONS; DOMAINS; BINDING; CDNA AB The molecular weights of five low density lipoprotein (LDL) subfractions from four normal healthy males were determined by analytic ultracentrifuge sedimentation equilibria. Protein content of each subfraction was determined by elemental CHN analysis, and weights of apoprotein peptides were calculated. Molecular weights in subfractions of increasing density were 2.92 +/- 0.26, 2.94 +/- 0.12, 2.68 +/- 0.09, 2.68 +/- 0.28 and 2.23 +/- 0.22 million Da, and protein weight percentages were 21.05, 21.04, 22.05, 23.10 and 29.10, in subfractions 1, 2, 3, 4 and 5, respectively. Total mean apoprotein weights for respective subfractions were 614 +/- 53, 621 +/- 45, 588 +/- 9, 637 +/- 83 and 645 +/- 62 KDa. In addition to a single apoprotein B-100 (apo B-100) peptide with a mean carbohydrate content of 7.1% and a molecular weight of 550 KDa per LDL particle, there may be one or more apoprotein E peptides of 34 KDa and/or apoprotein C-III of 9 KDa. In addition, subfractions 4 and 5 may contain 3-7% apolipoprotein (a). There is considerable heterogeneity among LDL subfractions as well as within the same fraction from different individuals. This heterogeneity may relate to differences in origin, metabolism and/or atherogenicity as a result of their content of apoproteins other than apo B-100. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF BERKELEY,DONNER LAB,BERKELEY,CA 94720. RP KAHLON, TS (reprint author), USDA ARS,WESTERN REG RES CTR,800 BUCHANAN ST,ALBANY,CA 94710, USA. NR 19 TC 4 Z9 4 U1 0 U2 1 PU AMER OIL CHEMISTS SOC PI CHAMPAIGN PA 1608 BROADMOOR DRIVE, CHAMPAIGN, IL 61821-0489 SN 0024-4201 J9 LIPIDS JI Lipids PD DEC PY 1992 VL 27 IS 12 BP 1055 EP 1057 DI 10.1007/BF02535588 PG 3 WC Biochemistry & Molecular Biology; Nutrition & Dietetics SC Biochemistry & Molecular Biology; Nutrition & Dietetics GA KE209 UT WOS:A1992KE20900020 PM 1487953 ER PT J AU NUMAKURA, H KOIWA, M ANDO, T YOO, MH AF NUMAKURA, H KOIWA, M ANDO, T YOO, MH TI EFFECTS OF ELASTIC-ANISOTROPY ON THE PROPERTIES OF A+C DISLOCATIONS IN HCP METALS SO MATERIALS TRANSACTIONS JIM LA English DT Article DE ELASTIC ANISOTROPY; HCP METALS; DISLOCATIONS; MECHANICAL PROPERTIES; PLASTIC DEFORMATION ID CORE STRUCTURE; 1/3(1123)(1011) DISLOCATIONS; COMPUTER-SIMULATION; SCREW DISLOCATION; CRYSTALS; MOTION AB The elastic energy, displacement field, and Peierls stress of a+c dislocations have been calculated on the basis of anisotropic elasticity theory for several h.c.p. metals. The preferences of glide planes predicted from the self-energy of an edge dislocation and the profile of nonuniform displacement distribution around a screw dislocation agree with the experimental observations for the strongly anisotropic metals, Zn and Cd, but not for the others. The Peierls stress of an a+c edge dislocation exhibits little correlation with experiments; the plane of the lowest Peierls stress is not always the observed glide plane. The calculated Peierls stress is primarily governed by the geometry of the slip system, i.e. the magnitude of the Burgers vector and the interplanar spacing, rather than the elastic anisotropy. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP NUMAKURA, H (reprint author), KYOTO UNIV,DEPT MET SCI & TECHNOL,KYOTO 60601,JAPAN. NR 26 TC 10 Z9 10 U1 1 U2 3 PU JAPAN INST METALS PI SENDAI PA AOBA ARAMAKI, SENDAI 980, JAPAN SN 0916-1821 J9 MATER T JIM JI Mater. Trans. JIM PD DEC PY 1992 VL 33 IS 12 BP 1130 EP 1137 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KJ180 UT WOS:A1992KJ18000007 ER PT J AU TURNBULL, A BALLINGER, RG HWANG, IS MORRA, MM PSAILADOMBROWSKI, M GATES, RM AF TURNBULL, A BALLINGER, RG HWANG, IS MORRA, MM PSAILADOMBROWSKI, M GATES, RM TI HYDROGEN TRANSPORT IN NICKEL-BASE ALLOYS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID PERMEATION; DIFFUSION AB The electrochemical permeation technique has been used to characterize hydrogen transport and trapping in pure nickel and in alloys 600, X-750, and 718 at a temperature of 80-degrees-C. The 'effective diffusivity'' of hydrogen atoms in alloy 600 is reduced by a factor of about 5 compared to pure nickel. This is attributed to both compositional changes and the presence of [(Ti, Nb)C] carbides. Aging of alloy 600, with subsequent M23C6 carbide precipitation, does not significantly influence the measured ''effective diffusivity,'' which is explained by the dominant effect of preexisting [(Ti, Nb)C] carbides. The 'effective diffusivity'' of hydrogen atoms in solution-annealed alloy X-750 is reduced by a factor of about 9 compared to that of pure nickel. This is also attributed to compositional changes and [(Ti, Nb)C] carbides. Aging of alloy X-750, which causes precipitation of gamma'[Ni3(Al, Ti)], reduces the 'effective diffusivity'' by an additional factor of 5 or more. Double aging at 885-degrees-C/24 hours, 704-degrees-C/20 hours following hot working yields the greatest reduction in 'effective diffusivity.'' Analysis of permeation transients using a diffusion-trapping model indicates a binding energy associated with trapping due to the gamma' phase of between -31 and -37 kJ/mol. The 'effective diffusivity'' of hydrogen in alloy 718 is about 40 pct greater than for alloy X-750 for the same double and direct aging treatments. The average ''effective diffusivities'' of the double-aged and direct-aged alloy 718 are comparable, but the permeation transients for the double-aged treatment are significantly steeper. The double-aged treatment with predominantly delta phase (orthorhombic Ni3Nb) yields a binding energy of about -30 kJ/mol. Analysis of the direct aged-treated 718, which contains predominantly gamma'' phase (body-centered tetragonal Ni3Nb) gave a binding energy between -23 and -27 kJ/mol. Segregation of hydrogen atoms to the gamma'/matrix interface, combined with a large volume fraction of gamma' at grain boundaries, provides the most likely explanation for the enhanced cracking associated with the double-aging treatment in alloy X-750. C1 B&W MCDERMOTT,ALLIANCE,OH 44601. MIT,CAMBRIDGE,MA 02139. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TURNBULL, A (reprint author), NATL PHYS LAB,TEDDINGTON TW11 0LW,MIDDX,ENGLAND. NR 22 TC 37 Z9 37 U1 1 U2 16 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD DEC PY 1992 VL 23 IS 12 BP 3231 EP 3244 DI 10.1007/BF02663432 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA KJ357 UT WOS:A1992KJ35700005 ER PT J AU STALKER, MK MORRAL, JE ROMIG, AD AF STALKER, MK MORRAL, JE ROMIG, AD TI APPLICATION OF THE SQUARE ROOT DIFFUSIVITY TO DIFFUSION IN NI-CR-AL-MO ALLOYS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID SYSTEM; INTERDIFFUSION; COEFFICIENTS AB The square root diffusivity matrix [r] and diffusivity matrix [D] have been measured for a Ni-4.0 at. pct Cr-6.3 at. pct Al-3.5 at. pct Mo quaternary alloy at 1100-degrees-C. Using a constant diffusivity analysis, the diffusivities were obtained from three diffusion couples having small initial concentration differences of 5 at. pct or less. When elements of [r] were substituted into the error function solution of the diffusion equation, it was found that the predicted concentration profiles were accurate to within +/- 0.1 at. pct of measured values. Also, it was found that Mo tends to reduce the diffusion kinetics of Cr and Al in Ni-base alloys. These results suggest that these methods of analyzing diffusion data and predicting interdiffusion data can be applied to alloys containing more than four components. C1 UNIV CONNECTICUT,DEPT MET,STORRS,CT 06269. UNIV CONNECTICUT,INST MAT SCI,STORRS,CT 06269. SANDIA NATL LABS,MAT & PROC SCI,ALBUQUERQUE,NM 87185. OI Morral, John/0000-0001-9195-8254 NR 18 TC 18 Z9 18 U1 0 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD DEC PY 1992 VL 23 IS 12 BP 3245 EP 3249 DI 10.1007/BF02663433 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA KJ357 UT WOS:A1992KJ35700006 ER PT J AU ANDERSON, IE LAVERNIA, EJ JOHNSON, WA AF ANDERSON, IE LAVERNIA, EJ JOHNSON, WA TI SPRAY PROCESSING FUNDAMENTALS - COATING AND DEPOSITION - FOREWORD SO METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY LA English DT Editorial Material C1 UNIV CALIF IRVINE,IRVINE,CA 92717. MICHIGAN TECHNOL UNIV,HOUGHTON,MI 49931. RP ANDERSON, IE (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2141 J9 METALL TRANS B PD DEC PY 1992 VL 23 IS 6 BP 681 EP 681 DI 10.1007/BF02656447 PG 1 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KH948 UT WOS:A1992KH94800001 ER PT J AU SWANK, WD FINCKE, JR MASON, TA AF SWANK, WD FINCKE, JR MASON, TA TI BEHAVIOR OF LIQUID-METAL DROPLETS IN AN ASPIRATING NOZZLE SO METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY LA English DT Article AB Measurements of particle size, velocity, and relative mass flux were made on a spray field produced by aspirating liquid tin into 350-degrees-C argon flowing through a venturi nozzle via a small orifice in the throat of the nozzle. Details of the aspiration and droplet formation process were observed through windows in the nozzle. The spatial distribution of droplet size, velocity, and relative number density was measured at a location 10 mm from the nozzle exit. Due to the presence of separated flow in the nozzle, changes in nozzle inlet pressure did not significantly effect resulting droplet size and velocity. This suggests that good aerodynamic nozzle design is required if spray characteristics are to be controlled by nozzle flow. C1 YALE UNIV,DEPT MECH ENGN,NEW HAVEN,CT 06520. RP SWANK, WD (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 5 TC 1 Z9 1 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2141 J9 METALL TRANS B PD DEC PY 1992 VL 23 IS 6 BP 695 EP 700 DI 10.1007/BF02656449 PG 6 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KH948 UT WOS:A1992KH94800003 ER PT J AU SPANGLER, BD AF SPANGLER, BD TI STRUCTURE AND FUNCTION OF CHOLERA-TOXIN AND THE RELATED ESCHERICHIA-COLI HEAT-LABILE ENTEROTOXIN SO MICROBIOLOGICAL REVIEWS LA English DT Review ID ADP-RIBOSYLTRANSFERASE ACTIVITY; AERUGINOSA EXOTOXIN-A; AMINO-ACID-SEQUENCE; ADENOSINE DIPHOSPHATE-RIBOSYLATION; INTESTINAL ELECTROLYTE TRANSPORT; ADENYLATE-CYCLASE ACTIVATION; NUCLEOTIDE-BINDING PROTEIN; N-GLYCOSIDASE ACTIVITY; BOTULINUM TYPE-C; B-SUBUNIT AB Cholera and the related Escherichia coli-associated diarrheal disease are important problems confronting Third World nations and any area where water supplies can become contaminated. The disease is extremely debilitating and may be fatal in the absence of treatment. Symptoms are caused by the action of cholera toxin, secreted by the bacterium Vibrio cholerae, or by a closely related heat-labile enterotoxin, produced by Escherichia coli, that causes a milder, more common traveler's diarrhea. Both toxins bind receptors in intestinal epithelial cells and insert an enzymatic subunit that modifies a G protein associated with the adenylate cyclase complex. The consequent stimulated production of cyclic AMP, or other factors such as increased synthesis of prostaglandins by intoxicated cells, initiates a metabolic cascade that results in the excessive secretion of fluid and electrolytes characteristic of the disease. The toxins have a very high degree of structural and functional homology and may be evolutionarily related. Several effective new vaccine formulations have been developed and tested, and a growing family of endogenous cofactors is being discovered in eukaryotic cells. The recent elucidation of the three-dimensional structure of the heat-labile enterotoxin has provided an opportunity to examine and compare the correlations between structure and function of the two toxins. This information may improve our understanding of the disease process itself, as well as illuminate the role of the toxin in studies of signal transduction and G-protein function. C1 ARGONNE NATL LAB, DIV BIOL & MED RES, ARGONNE, IL 60439 USA. OI Spangler, Brenda/0000-0001-6093-7469 NR 297 TC 652 Z9 670 U1 18 U2 77 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0146-0749 J9 MICROBIOL REV JI Microbiol. Rev. PD DEC PY 1992 VL 56 IS 4 BP 622 EP 647 PG 26 WC Microbiology SC Microbiology GA KB375 UT WOS:A1992KB37500007 PM 1480112 ER PT J AU Simmons, AD Longmire, JL Reeder, TW Wichman, HA Baker, RJ AF Simmons, A. D. Longmire, J. L. Reeder, T. W. Wichman, H. A. Baker, R. J. TI Restriction fragment length polymorphisms in satellite DNA distinguish chromosomal races of the white-footed mouse Peromyscus leucopus SO MOLECULAR ECOLOGY LA English DT Article DE DNA polymorphisms; DNA zipcodes; molecular cloning; Peromyscus leucopus; population genetics; satellite DNA AB We describe a polymorphism revealed by a high-copy-number tandem repeat which serves to distinguish most individuals sampled (96%) from two chromosomal races of Peromyscus leucopus. Classical morphology, allozymes, mtDNA, and rDNA have all failed to provide fixed markers which separate these two chromosomal races. Data from P. leucopus further documents the utility of DNA polymorphisms to establish the natal origin (DNA 'zipcodes') of populations or individuals. C1 [Simmons, A. D.; Longmire, J. L.; Baker, R. J.] Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA. [Longmire, J. L.] Univ Calif Los Alamos Natl Lab, Div Life Sci, Los Alamos, NM 87545 USA. [Reeder, T. W.] Univ Texas Austin, Dept Zool, Austin, TX 78712 USA. [Reeder, T. W.] Univ Texas Austin, Texas Mem Museum, Austin, TX 78712 USA. [Wichman, H. A.] Univ Idaho, Dept Biol Sci, Moscow, ID 83843 USA. RP Baker, RJ (reprint author), Texas Tech Univ, Dept Biol Sci, Lubbock, TX 79409 USA. FU NSF; NIH; HAW FX We thank K. L. Bowers, L. L. Janecekand M. S. Powell for reviewing the manuscript. R. D. Bradley, N. C. Brown, M. D. Engstrom, M. J. Hamilton, M. Maltbie, C. A. Porter, R. A. Van Den Bussche, and S. M. Witte assisted in collecting the specimens and in laboratory work. This study was funded by grants from NSF and NIH to RJB and HAW, respectively. NR 15 TC 2 Z9 2 U1 0 U2 0 PU WILEY-BLACKWELL PUBLISHING, INC PI MALDEN PA COMMERCE PLACE, 350 MAIN ST, MALDEN 02148, MA USA SN 0962-1083 J9 MOL ECOL JI Mol. Ecol. PD DEC PY 1992 VL 1 IS 4 BP 251 EP 254 DI 10.1111/j.1365-294X.1992.tb00184.x PG 4 WC Biochemistry & Molecular Biology; Ecology; Evolutionary Biology SC Biochemistry & Molecular Biology; Environmental Sciences & Ecology; Evolutionary Biology GA V00QN UT WOS:000206802600007 ER PT J AU STANKER, LH MCKEOWN, C BALHORN, R LEE, C MAZRIMAS, J GORALKA, M WYROBEK, A AF STANKER, LH MCKEOWN, C BALHORN, R LEE, C MAZRIMAS, J GORALKA, M WYROBEK, A TI IMMUNOLOGICAL EVIDENCE FOR A P2-PROTAMINE PRECURSOR IN MATURE RAT SPERM SO MOLECULAR REPRODUCTION AND DEVELOPMENT LA English DT Article DE ANTIPROTAMINE ANTIBODY; IMMUNOGRAM; PROTAMINE IMMUNOBLOTS ID AMINO-ACID-SEQUENCE; STALLION SPERMATOZOA; NUCLEOTIDE-SEQUENCE; STRUCTURAL EVIDENCE; MOUSE PROTAMINE-1; MAJOR PROTAMINE; 2 FORMS; PROTEINS; PURIFICATION; VARIANTS AB High molecular weight proteins in Rattus norvegicus that are immunoreactive with an anti-protamine 2 specific antibody but not with an anti-protamine 1 specific antibody are described. These proteins were detected by coupling high-performance liquid chromatography (HPLC) with an enzyme-linked immunosorbent assay (ELISA). Briefly, following HPLC separation of rat sperm nuclear proteins, the HPLC fractions were probed with the antibodies. We estimate that the antibody probes are 100-1000 times more sensitive than UV absorbance measurements. Immunoblot analysis following acid-urea electrophoretic separation of rat sperm nuclear proteins, and of the HPLC fractions, also detected putative protamine 2 precursor proteins. The proteins reactive with the anti-protamine 2 antibody are most likely not mature protamine 2, since they were detected in a region of the chromatogram where we would not expect protamine 2 to migrate based on the chromatographic locations of human and mouse protamine 2. Likewise, the immunoblotting experiments demonstrated that the anti-protamine 2 antibody recognized proteins with slower electrophoretic mobilities than would be expected for a mature protamine 2. An anti-protamine 1 monoclonal antibody, Hup1N, that binds rat protamine 1 is also described. Hup1N allowed for identification of the HPLC fractions that contained rat protamine 1. Finally, we demonstrated that Hup1N binds protamine 1 from a large number of species, suggesting a conserved epitope for Hup1N. C1 LOS ALAMOS NATL LAB,DIV BIOMED SCI,LOS ALAMOS,NM 87544. NR 34 TC 18 Z9 18 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 1040-452X J9 MOL REPROD DEV JI Mol. Reprod. Dev. PD DEC PY 1992 VL 33 IS 4 BP 481 EP 488 DI 10.1002/mrd.1080330415 PG 8 WC Biochemistry & Molecular Biology; Cell Biology; Developmental Biology; Reproductive Biology SC Biochemistry & Molecular Biology; Cell Biology; Developmental Biology; Reproductive Biology GA KA308 UT WOS:A1992KA30800014 PM 1472378 ER PT J AU FULLERTON, EE SCHULLER, IK BRUYNSERAEDE, Y AF FULLERTON, EE SCHULLER, IK BRUYNSERAEDE, Y TI QUANTITATIVE X-RAY-DIFFRACTION FROM SUPERLATTICES SO MRS BULLETIN LA English DT Article ID YBA2CU3O7-X/PRBA2CU3O7-X SUPERLATTICES; FILMS; MULTILAYERS; SCATTERING; GROWTH; TRANSITION; DISORDER; LATTICE C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. KATHOLIEKE UNIV LEUVEN,DEPT PHYS,LOUVAIN,BELGIUM. RP FULLERTON, EE (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Fullerton, Eric/H-8445-2013 OI Fullerton, Eric/0000-0002-4725-9509 NR 45 TC 25 Z9 25 U1 1 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD DEC PY 1992 VL 17 IS 12 BP 33 EP 38 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA KD070 UT WOS:A1992KD07000006 ER PT J AU BRANDRIFF, BF GORDON, LA AF BRANDRIFF, BF GORDON, LA TI SPATIAL-DISTRIBUTION OF SPERM-DERIVED CHROMATIN IN ZYGOTES DETERMINED BY FLUORESCENCE INSITU HYBRIDIZATION SO MUTATION RESEARCH LA English DT Article DE ZYGOTE CHROMATIN SPATIAL DISTRIBUTION; FLUORESCENCE INSITU HYBRIDIZATION; SPERM CHROMATIN; CHROMOSOME DOMAINS; HETEROCHROMATIN; FEMALE GENETIC RISK ID MICE FERTILIZED INVITRO; INTERPHASE CELL-NUCLEI; CHROMOSOME-ABERRATIONS; X-IRRADIATION; MOUSE ZYGOTES; DNA-SEQUENCES; HUMAN OOCYTES; DOMAINS; GENOME; ORGANIZATION AB Fluorescence in situ hybridization was used to determine the spatial distribution of chromatin in zygote pronuclei. A hybrid system involving golden hamster eggs and individual human sperm permitted use of DNA probes specific for the entire human chromosome 4, for the heterochromatic region on the long arm of the human Y chromosome and for unique DNA sequences on human chromosome 19. Chromosome 4 occupied a circumscribed domain in the pronuclei, similar to findings in somatic interphases. Unlike the situation in somatic interphases, the Y heterochromatin was extended throughout the first cell cycle. Pronuclear chromatin was extended 3- to 4-fold compared to somatic interphase chromatin. The extended pronuclear chromatin conformation is likely to affect a zygote's susceptibility to environmental hazards. RP BRANDRIFF, BF (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV BIOL SCI,CTR HUMAN GENOME,POB 808,L-452,LIVERMORE,CA 94550, USA. NR 40 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD DEC PY 1992 VL 296 IS 1-2 BP 33 EP 42 DI 10.1016/0165-1110(92)90030-D PG 10 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JZ006 UT WOS:A1992JZ00600004 PM 1279406 ER PT J AU RUSSELL, LB RUSSELL, WL AF RUSSELL, LB RUSSELL, WL TI FREQUENCY AND NATURE OF SPECIFIC-LOCUS MUTATIONS INDUCED IN FEMALE MICE BY RADIATIONS AND CHEMICALS - A REVIEW SO MUTATION RESEARCH LA English DT Review DE SPONTANEOUS MUTATIONS IN FEMALES; OOCYTES, ARRESTED, MUTATIONS IN; OOCYTES, MATURE AND MATURING, MUTATIONS IN; ZYGOTE, MUTATIONS INDUCED IN; MOSAICS, MUTATIONAL; GENETIC LESIONS, NATURE OF; FEMALES, PREADULT, MUTATION RATE IN; RADIATION DOSE PROTRACTION, EFFECT ON MUTATION YIELD OF ID MOUSE IMMATURE OOCYTES; MOSAIC MUTANTS; INDUCTION; ZYGOTES AB The inducibility of heritable mutations in female mammals has been measured in the mouse specific-locus test (SLT). For radiation-induced mutations, a large body of data has been accumulated that includes information about biological and physical factors that influence mutation yields. However, relatively few SLT studies in females have been conducted with chemicals to date. A single estimate of the spontanous mutation rate in oocytes, 6/536,207, has been derived as the most appropriate one to subtract from experimental rates. This rate is highly significantly below the spontaneous mutation rate in males. Mutations recovered from females mutagenized at any time after about the 12th day post-conception are induced in non-dividing cells. In adult females, most oocytes are arrested in small follicles; maturation from this stage to ovulation takes several weeks. High-dose-rate radiations are more mutagenic in mature and maturing oocytes than in spermatogonia of the male; on the other hand, no clearly induced mutations have been recovered from irradiated arrested oocytes. Efficient repair processes have been invoked to explain the latter finding as well as the upward-curving dose-effect relation for acute irradiation, and the fact that dose protraction drastically reduces mutation yield from mature and maturing oocytes. The dose-protraction effect is much greater than that found in spermatogonia. Radiation-induced mutation rates in embryonic, fetal, and newborn females are overall lower than those in the mature and maturing oocytes of adults. A dose-protraction effect has also been demonstrated at an early developmental stage when the nuclear morphology of mouse oocytes most resembles that of the human. Of only 5 chemicals so far explored for their effect in oocytes, 2 (ethylnitrosourea, ENU, and triethylenemelamine, TEM), and possibly a third (procarbazine hydrochloride, PRC), are mutagenic - with at least one of these (ENU) mutagenic in arrested as well as maturing oocytes. However, the mutation rate is, in each case, lower than for treated male germ cells. By contrast, ENU-induced mutation yield for the maternal genome of the zygote is an order of magnitude higher than that for the zygote's paternal genome or for spermatogonia. A high proportion of mutants derived from chemical treatment of oocytes (including the oocyte genome in zygotes) are mosaics, probably owing to lesions affecting only 1 strand of the DNA. A characteristic of specific-locus mutations induced in oocytes is that they include a considerably higher percentage of large (multi-locus) lesions (LLs) than do mutations induced in spermatogonia. For each germ-cell type, the frequency of LLs appears lower for the chemicals so far tested than for radiations. RP RUSSELL, LB (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831, USA. FU NIEHS NIH HHS [22Y01-ES-10067] NR 52 TC 82 Z9 82 U1 1 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD DEC PY 1992 VL 296 IS 1-2 BP 107 EP 127 DI 10.1016/0165-1110(92)90035-8 PG 21 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JZ006 UT WOS:A1992JZ00600009 PM 1279398 ER PT J AU SUDMAN, PD RUTLEDGE, JC BISHOP, JB GENEROSO, WM AF SUDMAN, PD RUTLEDGE, JC BISHOP, JB GENEROSO, WM TI BLEOMYCIN - FEMALE-SPECIFIC DOMINANT LETHAL EFFECTS IN MICE SO MUTATION RESEARCH LA English DT Article DE MOUSE; OOCYTE; CHROMOSOMAL ABERRATION; DOMINANT LETHAL; REPRODUCTIVE EFFECTS; BLEOMYCIN ID FRAGILE SITES; DNA; CHROMOSOME; CANCER AB Limited comparative data in mice indicate that chemical mutagens that induce dominant lethal mutations in males are not necessarily effective in females, but those which are effective in females are generally equally or more effective in males. Recently, however, a few chemicals have been identified that are female-specific with respect to induction of dominant lethal mutations. The antitumor antibiotic adriamycin is among them. Another antitumor antibiotic, bleomycin was examined for its ability to induce dominant lethal mutations in the reproductive cells of male and female mice. No dominant lethal or cytotoxic effects were observed in males treated with bleomycin, even at a maximum tolerated dose. In females, on the other hand, a dose nearly 1/4 of that used in males induced not only a high level of dominant lethal mutations but also killed oocytes in certain stages of follicular development. The effectiveness of bleomycin in inducing dominant lethal mutations in mouse oocytes makes it a valuable tool for investigating whether gonadal transport, inherent differences in the configuration of chromatin in the germ cells of the two sexes or other factors are responsible for the differential susceptibility to bleomycin, which implies potential gender-specific genetic risk in cancer chemotherapy. C1 OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. UNIV WASHINGTON,CHILDRENS HOSP,SCH MED,DEPT LAB MED,SEATTLE,WA 98105. NIEHS,CELLULAR & GENET TOXICOL BRANCH,RES TRIANGLE PK,NC 27709. FU NIEHS NIH HHS [Y01-ES-20085] NR 29 TC 26 Z9 27 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD DEC PY 1992 VL 296 IS 1-2 BP 143 EP 156 DI 10.1016/0165-1110(92)90038-B PG 14 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JZ006 UT WOS:A1992JZ00600012 PM 1279401 ER PT J AU RUTLEDGE, JC GENEROSO, WM SHOURBAJI, A CAIN, KT GANS, M OLIVA, J AF RUTLEDGE, JC GENEROSO, WM SHOURBAJI, A CAIN, KT GANS, M OLIVA, J TI DEVELOPMENTAL ANOMALIES DERIVED FROM EXPOSURE OF ZYGOTES AND 1ST-CLEAVAGE EMBRYOS TO MUTAGENS SO MUTATION RESEARCH LA English DT Article DE MOUSE; ZYGOTE; X-RAYS; GERM CELLS; MALFORMATIONS; BIRTH DEFECTS ID PREIMPLANTATION MOUSE EMBRYOS; N-NITROSOUREA EXPOSURE; ETHYLENE-OXIDE; FEMALE MICE; FETAL ANOMALIES; X-RAYS; INDUCTION; MALFORMATIONS; METHANESULFONATE; PROCARBAZINE AB Results of continuing studies indicate that the mouse zygote and two-cell embryo stages are a window of susceptibility in the experimental induction of congenital anomalies with certain mutagenic agents. The mechanisms by which the mutagens initiate the pathogenesis of these developmental defects are not known. However, in certain cases there is evidence that a nonconventional, perhaps epigenetic, mechanism is involved. Detailed characterization of the spectrum of anomalies induced and comparison of responses at the various stages exposed allowed classification of the mutagens generally into two groups. One group is characterized by being effective only in the early stages of zygote development and capable of producing a relatively high incidence of fetal death and hydrops. The other group affects all of the zygote stages studied as well as the two cell-embryo, but does not increase the incidence of fetal death and hydrops. Except for hydrops, chemicals in the two groups do not differ in terms of the types of anomalies present among malformed live fetuses, which bear a resemblance to a subset of common, sporadic human developmental anomalies that are of unknown etiology. This similarity raises the possibility that certain human developmental defects may have their origins in events that happen in the zygote and early pre-implantation stages. C1 UNIV WASHINGTON,SCH MED,SEATTLE,WA 98105. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV N TEXAS,DEPT BIOL,DENTON,TX 76203. RP RUTLEDGE, JC (reprint author), CHILDRENS HOSP & MED CTR,DEPT LAB MED,POB C-5371,SEATTLE,WA 98105, USA. FU NIEHS NIH HHS [Y01-ES-20085] NR 35 TC 51 Z9 55 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD DEC PY 1992 VL 296 IS 1-2 BP 167 EP 177 DI 10.1016/0165-1110(92)90040-G PG 11 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA JZ006 UT WOS:A1992JZ00600014 PM 1279403 ER PT J AU RUSSELL, MJ WHITE, R PATEL, E MARKESBERY, WR WATSON, CR GEDDES, JW AF RUSSELL, MJ WHITE, R PATEL, E MARKESBERY, WR WATSON, CR GEDDES, JW TI FAMILIAL INFLUENCE ON PLAQUE-FORMATION IN THE BEAGLE BRAIN SO NEUROREPORT LA English DT Article DE ALZHEIMERS DISEASE; DOGS; AMYLOID; SENILE PLAQUES; GENETICS; AGING; CANINE DEMENTIA; ANIMAL MODEL ID NEUROFIBRILLARY CHANGES; ALZHEIMERS-DISEASE; PICK BODIES; AGED DOGS; CONSERVATION; MAMMALS; SENILE AB AGED canines exhibit central neuropathological changes strikingly similar to those seen in patients with Alzheimer's disease. In this study, brain tissue from pure bred beagles raised in a controlled environment were examined for Alzheimer-like pathology. The mean age of the animals was 15.6 years. The incidence of plaques among these 29 dogs was 65.5%. Of the 19 samples that demonstrated Alzheimer-like pathology, 18 were characterized as diffuse and one as neuritic. Plaque density was found to be independent of age. Plaque numbers were highest in the perirhinal cortex and the adjacent temporal cortex. Familial influence on plaque development is supported by congruence within 15 of the 16 litters examined (p < 0.001). In this environmentally controlled group the diffuse plaques were rarely converted to the dense neuritic plaques found in Alzheimer's disease. C1 UNIV KENTUCKY, SANDERS BROWN CTR AGING, LEXINGTON, KY 40536 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. UNIV CALIF DAVIS, INST TOXICOL & ENVIRONM HLTH, DAVIS, CA 95616 USA. RP RUSSELL, MJ (reprint author), UNIV CALIF DAVIS, DEPT ANESTHESIOL, TB170, DAVIS, CA 95616 USA. FU NIA NIH HHS [1RO1-AG10678, 5-P50-AG05144, 1PO1-AG05119] NR 22 TC 29 Z9 30 U1 0 U2 1 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0959-4965 J9 NEUROREPORT JI Neuroreport PD DEC PY 1992 VL 3 IS 12 BP 1093 EP 1096 DI 10.1097/00001756-199212000-00015 PG 4 WC Neurosciences SC Neurosciences & Neurology GA KH030 UT WOS:A1992KH03000015 PM 1493222 ER PT J AU DURBIN, PW AF DURBIN, PW TI DISTRIBUTION OF TRANSURANIC ELEMENTS IN BONE SO NEUROTOXICOLOGY LA English DT Article DE TRANSURANIC ELEMENTS; LEAD; BONE; RETENTION; TRANSPORT; DISTRIBUTION; BLOOD AND TRANSPORT OF TRANSURANIC ELEMENTS ID BEAGLES; AM-241 AB The transport, retention, and excretion of transuranic elements from the body have been widely studied for many years. A summary of the results is given with an emphasis on the distribution of these elements in bone. Implications of these studies for understanding the relationships between lead in blood and lead in bone are presented. The expected distribution of lead at various bone sites is also considered. RP DURBIN, PW (reprint author), LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720, USA. NR 16 TC 5 Z9 5 U1 0 U2 0 PU INTOX PRESS INC PI LITTLE ROCK PA PO BOX 24865, LITTLE ROCK, AR 72221 SN 0161-813X J9 NEUROTOXICOLOGY JI Neurotoxicology PD WIN PY 1992 VL 13 IS 4 BP 821 EP 824 PG 4 WC Neurosciences; Pharmacology & Pharmacy; Toxicology SC Neurosciences & Neurology; Pharmacology & Pharmacy; Toxicology GA KT653 UT WOS:A1992KT65300012 PM 1338802 ER PT J AU JONES, KW BOCKMAN, RS BRONNER, F AF JONES, KW BOCKMAN, RS BRONNER, F TI MICRODISTRIBUTION OF LEAD IN BONE - A NEW APPROACH SO NEUROTOXICOLOGY LA English DT Article DE LEAD; SYNCHROTRON X-RAY MICROSCOPE; GALLIUM; CALCIUM IN BONE; MODELS FO ACUTE AND CHRONIC OF LEAD UPTAKE; DISTRIBUTION AND BONE CONTENT; RICKETS AND VITAMIN-D ID GALLIUM AB A knowledge of the microdistribution of lead in bone is important in order to understand the mechanisms for accumulation and release of lead. The availability of the synchrotron x-ray microscope for sensitive measurements of bone content and distribution of lead provides a valuable tool which, when combined with kinetic, balance, and tissue measurements, can lead to better evaluation of lead toxicity. ft may also provide the basis for the development of a suitable model of how lead behaves in the human body. An outline of an experimental protocol for exploitation of the x-ray microscope is given, along with synchrotron x-ray microscope measurements of the distribution of gallium in rat bone that demonstrate the feasibility of the experimental approach. C1 HOSP SPECIAL SURG,NEW YORK,NY 10021. CORNELL UNIV,MED CTR,COLL MED,NEW YORK,NY 10021. UNIV CONNECTICUT,CTR HLTH,FARMINGTON,CT 06030. RP JONES, KW (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,BLDG 815,UPTON,NY 11973, USA. FU NCRR NIH HHS [P41RR01838] NR 13 TC 8 Z9 8 U1 1 U2 1 PU INTOX PRESS INC PI LITTLE ROCK PA PO BOX 24865, LITTLE ROCK, AR 72221 SN 0161-813X J9 NEUROTOXICOLOGY JI Neurotoxicology PD WIN PY 1992 VL 13 IS 4 BP 835 EP 841 PG 7 WC Neurosciences; Pharmacology & Pharmacy; Toxicology SC Neurosciences & Neurology; Pharmacology & Pharmacy; Toxicology GA KT653 UT WOS:A1992KT65300014 PM 1302309 ER PT J AU EBADIAN, MA YANG, G BIGZADEH, E WALKER, JF ABRAHAM, TJ AF EBADIAN, MA YANG, G BIGZADEH, E WALKER, JF ABRAHAM, TJ TI ANALYSIS OF HEAT AND MASS-TRANSFER TO DETERMINE HEAT-LOSS AND THE RATE OF CONDENSATION OF THE MVSTS OFF-GAS DUCTS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article AB Reduction of the existing nuclear waste in the Melton Valley Storage Tanks (MVSTs) at the Oak Ridge National Laboratory (ORNL) is of utmost concern to the scientists at this facility. This paper provides proof that a combination of vault heating, sparged air heating, and prevention of condensation is the best alternative to achieve this goal. Therefore, in this study a general system of mathematical equations has been developed taking into account all of the parameters affecting evaporation and condensation. This evaporation process has been analyzed by the careful modeling of a bubble chain through the extremely viscous, radioactive liquid contained in the storage tanks. This paper discusses in detail the evaporation procedure using bubble formation, air velocity, and determining the rate at which this liquid waste can be removed from the MVSTs by evaporation under different conditions of the sparging air. An additional objective is to study the heating/cooling of the condensation process of the off-gas piping inside the vault. A laboratory scale model has also been assembled for this purpose at ORNL to verify the accuracy of the mathematical modeling. A comparison of the experimental findings with the mathematical modeling shows excellent agreement. C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. RP EBADIAN, MA (reprint author), FLORIDA INT UNIV,DEPT MECH ENGN,MIAMI,FL 33199, USA. NR 16 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 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD DEC PY 1992 VL 138 IS 3 BP 389 EP 401 DI 10.1016/0029-5493(92)90073-5 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KE439 UT WOS:A1992KE43900011 ER PT J AU BAYLOR, LR SCHMIDT, GL HOULBERG, WA MILORA, SL GOWERS, CW BAILEY, WP GADEBERG, M KUPSCHUS, P TAGLE, JA OWENS, DK MANSFIELD, DK PARK, HK AF BAYLOR, LR SCHMIDT, GL HOULBERG, WA MILORA, SL GOWERS, CW BAILEY, WP GADEBERG, M KUPSCHUS, P TAGLE, JA OWENS, DK MANSFIELD, DK PARK, HK TI PELLET FUELING DEPOSITION MEASUREMENTS ON JET AND TFTR SO NUCLEAR FUSION LA English DT Article ID HYDROGEN PELLET; TOKAMAK PLASMAS; ABLATION RATE; INJECTION; DISCHARGES; SYSTEM; MODEL AB The effective radial deposition profile of deuterium pellets injected into the Joint European Torus (JET) and the Tokamak Fusion Test Reactor (TFTR) has been determined from Thomson scattering diagnostic measurements of electron density taken immediately after pellet injection. The pellet ablation rate deduced from these measurements differs from that predicted by conventional pellet ablation theory. The possibility of enhanced radial transport during the ablation process has been examined to determine whether this can explain the difference between theory and experiment, but no evidence has been found to support such an explanation. The temporal evolution of the Balmer alpha light emitted during pellet ablation is found to be different from the effective pellet ablation rate determined from the density profile measurements. We conclude that the shielding mechanisms of conventional pellet ablation models have to be modified in order to predict and reproduce the observed effective ablation rate and penetration depth. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ. JET JOINT UNDERTAKING,ABINGDON,OXON,ENGLAND. RP BAYLOR, LR (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 23 TC 37 Z9 39 U1 1 U2 6 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1992 VL 32 IS 12 BP 2177 EP 2187 DI 10.1088/0029-5515/32/12/I08 PG 11 WC Physics, Fluids & Plasmas SC Physics GA KH807 UT WOS:A1992KH80700008 ER PT J AU SEKI, T KUMAZAWA, R WATARI, T ONO, M YASAKA, Y SHIMPO, F ANDO, A KANEKO, O OKA, Y ADATI, K AKIYAMA, R HAMADA, Y HIDEKUMA, S HIROKURA, S IDA, K KARITA, A KAWAHATA, K KAWAMOTO, T KAWASUMI, Y KITOH, Y KOJIMA, M MASAI, K MORITA, S NARIHARA, K OGAWA, Y OHKUBO, K OKAJIMA, S OZAKI, T SAKAMOTO, M SASAO, M SATO, K SATO, KN TAKAHASHI, H TANIGUCHI, Y TOI, K TSUZUKI, T AF SEKI, T KUMAZAWA, R WATARI, T ONO, M YASAKA, Y SHIMPO, F ANDO, A KANEKO, O OKA, Y ADATI, K AKIYAMA, R HAMADA, Y HIDEKUMA, S HIROKURA, S IDA, K KARITA, A KAWAHATA, K KAWAMOTO, T KAWASUMI, Y KITOH, Y KOJIMA, M MASAI, K MORITA, S NARIHARA, K OGAWA, Y OHKUBO, K OKAJIMA, S OZAKI, T SAKAMOTO, M SASAO, M SATO, K SATO, KN TAKAHASHI, H TANIGUCHI, Y TOI, K TSUZUKI, T TI HIGH-FREQUENCY ION BERNSTEIN WAVE HEATING EXPERIMENT IN THE JIPP T-IIU TOKAMAK SO NUCLEAR FUSION LA English DT Article ID ALCATOR-C TOKAMAK; PLASMA; ANTENNA; RANGE AB An experiment in a new regime of ion Bernstein wave (IBW) heating was carried out using 130 MHz high power transmitters in the JIPP T-IIU tokamak. The heating regime utilized the IBW branch between the 3rd and 4th harmonics of the hydrogen ion cyclotron frequencies. This harmonic number is the highest one used in IBW experiments conducted previously. The net radiofrequency (RF) power injected into the plasma is around 400 kW and is limited by the transmitter output power. Core heating of ions and electrons was confirmed in the experiment and density profile peaking was found to be a special feature of IBW heating. Peaking of the density profile was also found when IBWs were injected into neutral beam heated discharges. An analysis, using a transport code with these experimental data, indicates thal particle and energy confinement should be improved in the plasma core region upon application of IBW heating. It is also found that the ion energy distribution function observed during IBW heating has a smaller high energy tail than those observed in conventional fast magnetosonic wave ICRF heating regimes. The ion energy distribution function obtained during IBW heating is in reasonable agreement with that calculated using the quasi-linear RF diffusion/Fokker-Planck model. C1 PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. CHUBU UNIV,COLL ENGN,KASUGAI 487,JAPAN. KYOTO UNIV,FAC ENGN,KYOTO 606,JAPAN. UNIV TOKYO,FAC ENGN,TOKYO 113,JAPAN. RP SEKI, T (reprint author), NATL INST FUS SCI,NAGOYA,JAPAN. RI Ida, Katsumi/E-4731-2016 OI Ida, Katsumi/0000-0002-0585-4561 NR 37 TC 27 Z9 27 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1992 VL 32 IS 12 BP 2189 EP 2201 DI 10.1088/0029-5515/32/12/I09 PG 13 WC Physics, Fluids & Plasmas SC Physics GA KH807 UT WOS:A1992KH80700009 ER PT J AU TAKASE, Y GOLDSTON, RJ BELL, MG CAVALLO, A FREDRICKSON, ED GREK, B HILL, KW MCCUNE, DC PARK, HK SCHIVELL, JF AF TAKASE, Y GOLDSTON, RJ BELL, MG CAVALLO, A FREDRICKSON, ED GREK, B HILL, KW MCCUNE, DC PARK, HK SCHIVELL, JF TI SAWTOOTH ACTIVITY AND HEAT PULSE-PROPAGATION IN OHMICALLY HEATED AND CENTER AND EDGE BEAM HEATED TFTR PLASMAS SO NUCLEAR FUSION LA English DT Letter ID TOKAMAK; JET; TRANSPORT AB Propagation of the heat pulse arising from a sawtooth crash was studied in ohmically heated plasmas as a function of density, and in neutral beam heated plasmas with centrally peaked and hollow power deposition profiles at two densities- The sawtooth period became longer with centre heating than with edge heating and with co-injection than with counter-injection. The lengthening of the sawtooth period was consistent with the reduction of the core loop voltage due to heating and non-inductive current drive. In Ohmic plasmas, the electron thermal diffusivity chi(e)HPP determined from a time-to-peak analysis decreased inversely.proportionally to density for n(e)BAR less-than-or-similar-to 2 x 10(19) m-3 where the energy confinement time tau(E) increases linearly with density, but chi(e)HPP became independent of density for n(e)BAR greater-than-or-similar-to 2 x 10(19) m-3 where tau(E) becomes independent of density. The values of chi(e)HPP for both beam heating profiles were nearly the same as for Ohmic plasmas, in contrast to the heat conduction coefficient chi(e)PB determined from power balance analysis which was enhanced for centre heated plasmas. Chi(e)HPP was always larger than chi(e)PB, typically by a factor of five. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP TAKASE, Y (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 16 TC 9 Z9 10 U1 0 U2 0 PU INT ATOMIC ENERGY AGENCY PI VIENNA PA WAGRAMERSTRASSE 5, PO BOX 100, A-1400 VIENNA, AUSTRIA SN 0029-5515 J9 NUCL FUSION JI Nucl. Fusion PD DEC PY 1992 VL 32 IS 12 BP 2246 EP 2252 DI 10.1088/0029-5515/32/12/I15 PG 7 WC Physics, Fluids & Plasmas SC Physics GA KH807 UT WOS:A1992KH80700015 ER PT J AU VAVRA, J AF VAVRA, J TI WIRE CHAMBER GASES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH ID COLLISION CROSS-SECTIONS; TRANSPORT-COEFFICIENTS; DRIFT VELOCITY; WATER-VAPOR; MIXTURES; METHANE; PARTICLE; ARGON; LIGHT; SIMULATION AB In this paper, we describe new developments in gas mixtures which have occurred during the last three to four years. In particular, we discuss new results on the measurement and modeling of electron drift parameters, the modeling of drift chamber resolution, measurements of primary ionization and the choice of gas for applications such as tracking, single electron detection, X-ray detection and visual imaging. In addition, new results are presented on photon feedback, breakdown and wire aging. RP VAVRA, J (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 58 TC 19 Z9 19 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 34 EP 47 DI 10.1016/0168-9002(92)90266-7 PG 14 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600005 ER PT J AU SMITH, GC YU, B FISCHER, J RADEKA, V HARDER, JA AF SMITH, GC YU, B FISCHER, J RADEKA, V HARDER, JA TI HIGH-RATE, HIGH-RESOLUTION, 2-DIMENSIONAL GAS PROPORTIONAL DETECTORS FOR X-RAY SYNCHROTRON RADIATION EXPERIMENTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH ID PROTEIN CRYSTALLOGRAPHY AB Two-dimensional, gas proportional detectors are being developed for use with X-ray synchrotron radiation. Two new types of interpolating cathode structures have been investigated, both of which can operate with a significantly smaller number of readout nodes along each sensing axis than previous cathodes. Lumped parameter delay lines are used as the position encoders. Timing signals from fast, low noise shaping electronics are fed to a new, dual TDC system developed for this purpose. Operating with a clock frequency of 500 MHz, the TDCs have an intrinsic differential nonlinearity of 0.1%. The complete system can handle X-ray fluxes in excess of 10(6)/S without distortion of the position information. A resolution of approximately 100 mum FWHM and differential nonlinearity of +/- 4% have been achieved. Application of a detector with active area 10 cm x 10 cm using synchrotron radiation is described. RP SMITH, GC (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 11 TC 15 Z9 15 U1 0 U2 1 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 78 EP 85 DI 10.1016/0168-9002(92)90272-6 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600011 ER PT J AU ADEVA, B AGUILARBENITEZ, M ALCARAZ, J ALOISIO, A ALVIGGI, MG ANTREASYAN, D BECKER, U BERDUGO, J BOBBINK, GJ BRAMBILLA, E BRANSON, JD BUJAK, A BURGOS, C BURGER, JD CARLINO, G CERRADA, M CHANG, YH CHIEFARI, G COLINO, N DRAGO, E DUINKER, P DURAN, I ERNE, F FABBRETTI, R FABRE, M GAU, SS GETTNER, M GONZALEZ, E VANDERGRAAF, H GUESEWELL, D GUTAY, LG HARTJES, FG HU, G INNOCENTE, V JIN, BN KONIG, AC KUMMAR, KS LANZANO, S LEGOFF, JM LEIJTENS, X LI, L MANA, C MAO, YF MARTINEZLASO, L MASSARO, GGG MCBRIDE, P MCMAHON, T MEROLA, L ONVLEE, H PATERNOSTER, G PATRICELLI, S PENG, Y PICCOLO, D PROKOFIEV, O QIAN, JM RAZIS, P RIEMERS, BC ROMERO, L RUBIO, JA RYKACZEWSKI, H SALICIO, J SARAKINOS, M SCHETKOVSKY, A SCHMITT, P SCHUTTE, J SCIACCA, C SCOTT, II SEILER, PG SUVOROV, V STRAUCH, K TIMMERMANS, C VOLKOV, S WANG, JH WANG, QF WANG, ZM WENAUS, T WHITE, M WILHELM, R WILLMOTT, C WYSLOUCH, B XI, FY YANG, BZ YANG, CG YANG, QY YE, CH ZHANG, ZP AF ADEVA, B AGUILARBENITEZ, M ALCARAZ, J ALOISIO, A ALVIGGI, MG ANTREASYAN, D BECKER, U BERDUGO, J BOBBINK, GJ BRAMBILLA, E BRANSON, JD BUJAK, A BURGOS, C BURGER, JD CARLINO, G CERRADA, M CHANG, YH CHIEFARI, G COLINO, N DRAGO, E DUINKER, P DURAN, I ERNE, F FABBRETTI, R FABRE, M GAU, SS GETTNER, M GONZALEZ, E VANDERGRAAF, H GUESEWELL, D GUTAY, LG HARTJES, FG HU, G INNOCENTE, V JIN, BN KONIG, AC KUMMAR, KS LANZANO, S LEGOFF, JM LEIJTENS, X LI, L MANA, C MAO, YF MARTINEZLASO, L MASSARO, GGG MCBRIDE, P MCMAHON, T MEROLA, L ONVLEE, H PATERNOSTER, G PATRICELLI, S PENG, Y PICCOLO, D PROKOFIEV, O QIAN, JM RAZIS, P RIEMERS, BC ROMERO, L RUBIO, JA RYKACZEWSKI, H SALICIO, J SARAKINOS, M SCHETKOVSKY, A SCHMITT, P SCHUTTE, J SCIACCA, C SCOTT, II SEILER, PG SUVOROV, V STRAUCH, K TIMMERMANS, C VOLKOV, S WANG, JH WANG, QF WANG, ZM WENAUS, T WHITE, M WILHELM, R WILLMOTT, C WYSLOUCH, B XI, FY YANG, BZ YANG, CG YANG, QY YE, CH ZHANG, ZP TI A HIGH-RESOLUTION MUON DETECTOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH ID DRIFT CHAMBERS AB The design and operation of precision drift chambers with multisampling as well as the concepts and methods for reaching an extraordinary degree of precision in mechanics and calibration are described. Specific instruments were developed for this purpose. The concept of reproducible positioning and the implementation to 30 mum accuracy, showing stability over three years, is given. Calibration and analysis with UV-laser and cosmic test measurements are outlined with the critical results. The experience of calibration and reliability of the large system in an actual L3 running experiment is analyzed. The resolution under ''battle conditions'' at LEP resulted in DELTAp/p = (2.50 +/- 0.04)% at 45.6 GeV and will be presented in detail. The concept is well suited for future TeV energies. C1 CIEMAT,CTR INVEST ENERGET MEDIOAMBIENTALES & TECHNOL,E-28040 MADRID,SPAIN. ETH ZURICH,EIDGENOSS TECH HSCH,ZURICH,SWITZERLAND. ST PETERSBURG NUCL PHYS INST,GATCHINA,RUSSIA. NATL INST NUCL PHYS & HIGH ENERGY PHYS,AMSTERDAM,NETHERLANDS. NORTHEASTERN UNIV,BOSTON,MA 01225. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. HIGH ENERGY PHYS GRP,TAIPEI,TAIWAN. HARVARD UNIV,CAMBRIDGE,MA 02138. UNIV SCI & TECHNOL CHINA,HEFEI 230029,PEOPLES R CHINA. WORLD LAB,FBLJA,PROJECT INT CTR SCI CULTURE,GENEVA,SWITZERLAND. INFN,SEZ BOLOGNA,I-40126 BOLOGNA,ITALY. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NATL INST NUCL PHYS & HIGH ENERGY PHYS,6525 ED NIJMEGEN,NETHERLANDS. PAUL SCHERRER INST,WURENLINGEN,SWITZERLAND. UNIV NAPLES,DIPARTIMENTO SCI FIS,I-80138 NAPLES,ITALY. US DOE,WASHINGTON,DC. MIT,NUCL SCI LAB,CAMBRIDGE,MA 02139. UNIV NAPLES,INFN,I-80138 NAPLES,ITALY. UNIV ALABAMA,TUSCALOOSA,AL 35486. UNIV MICHIGAN,ANN ARBOR,MI 48109. INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. PURDUE UNIV,W LAFAYETTE,IN 47907. CATHOLIC UNIV NIJMEGEN,6525 ED NIJMEGEN,NETHERLANDS. ARGONNE NATL LAB,ARGONNE,IL 60439. RP ADEVA, B (reprint author), CERN,EUROPEAN ORG NUCL RES,CH-1211 GENEVA 23,SWITZERLAND. RI Leijtens, Xaveer/F-3302-2010; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Duran, Ignacio/H-7254-2015; Adeva, Bernardo /L-1378-2014 OI Leijtens, Xaveer/0000-0001-7794-8236; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Adeva, Bernardo /0000-0001-9756-3712 NR 24 TC 53 Z9 54 U1 0 U2 4 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 109 EP 124 DI 10.1016/0168-9002(92)90277-B PG 16 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600016 ER PT J AU STANISLAUS, S ARMIJO, V BLACK, JK BOLTON, RD CARIUS, S COOPER, MD ESPINOZA, C HART, G HOGAN, G GONZALES, A MISCHKE, RE PIILONEN, LE SANDOVAL, J SCHILLING, S SENA, J SUAZO, G SZYMANSKI, JJ WHITEHOUSE, DA WILKINSON, CA FISK, R KOETKE, DD MANWEILER, RW JUI, CC AF STANISLAUS, S ARMIJO, V BLACK, JK BOLTON, RD CARIUS, S COOPER, MD ESPINOZA, C HART, G HOGAN, G GONZALES, A MISCHKE, RE PIILONEN, LE SANDOVAL, J SCHILLING, S SENA, J SUAZO, G SZYMANSKI, JJ WHITEHOUSE, DA WILKINSON, CA FISK, R KOETKE, DD MANWEILER, RW JUI, CC TI RESULTS FROM BEAM TESTS OF MEGAS LOW-MASS, HIGH-RATE CYLINDRICAL MWPCS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB One of the leading experimental projects at LAMPF has been the MEGA experiment. This is an experiment to search for the rare decay mu - egamma with a sensitivity of 10(-13). A prime component of this project has been the design and construction of high-rate, low-mass MWPCs for the tracking of positrons from muon decay. With rate capabilities of 2 x 10(4) e+/mm2/s and a thickness of 3 x 10(-4) radiation lengths, these chambers are state-of-the-art cylindrical MWPCs. Cylindrical chambers of this size (0.9 m2) and thinness have never been previously constructed. The MEGA project at LAMPF has recently succeeded in building chambers with these necessary performance characteristics as demonstrated by data taken from muon decays, cosmic rays, and sources. C1 VALPARAISO UNIV, VALPARAISO, IN 46383 USA. STANFORD UNIV, STANFORD, CA 94305 USA. RP STANISLAUS, S (reprint author), LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. NR 4 TC 4 Z9 4 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 198 EP 202 DI 10.1016/0168-9002(92)90288-F PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600027 ER PT J AU VANDIJK, JH AF VANDIJK, JH TI PERFORMANCE OF A MINI-TPC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH AB A mini-TPC has been built and tested with four rows of pads. The active area is 8 cm along the pad rows and 4 cm in the drift direction. Readout consists of preamp-amp-shaper-discriminator and pipeline TDC. The pulse length from the pulse over threshold discriminator is used to reflect the induced charge in the pads. The resolution obtained is 235 mum along the pad row and 75 mum x square-root L(drift)(cm) in the drift direction. The two track resolution is roughly 3 mm in the drift direction and 5 mm along the pad row, so that the active area has effectively 200 cells. RP VANDIJK, JH (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 3 TC 0 Z9 0 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 220 EP 223 DI 10.1016/0168-9002(92)90292-C PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600031 ER PT J AU ETKIN, A EISEMAN, SE FOLEY, KJ HACKENBURG, RW LONGACRE, RS LOVE, WA MORRIS, TW PLATNER, ED SAULYS, AC LINDENBAUM, SJ HALLMAN, TJ CHAN, CS KRAMER, MA ZHAO, KH ZHU, Y MADANSKY, L RAI, G AHMAD, S BONNER, BE BUCHANAN, JA CHIOU, CN CLEMENT, JM MUTCHLER, GS ROBERTS, JB AF ETKIN, A EISEMAN, SE FOLEY, KJ HACKENBURG, RW LONGACRE, RS LOVE, WA MORRIS, TW PLATNER, ED SAULYS, AC LINDENBAUM, SJ HALLMAN, TJ CHAN, CS KRAMER, MA ZHAO, KH ZHU, Y MADANSKY, L RAI, G AHMAD, S BONNER, BE BUCHANAN, JA CHIOU, CN CLEMENT, JM MUTCHLER, GS ROBERTS, JB TI EFFECTS OF HIGH BEAM RATES ON TPCS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH AB The TPCs (time projection chamber) used in E180 at the AGS (alternating gradient synchrotron) were exposed to silicon ion fluxes equivalent to more than 10(7) minimum ionizing particles per second to measure the distortion of the electric field caused by positive ions in the drift region. Results of these tests are presented and the consequences for the TPC based experiment at RHIC (relativistic heavy ion collider) are discussed. C1 CUNY CITY COLL,NEW YORK,NY 10031. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RICE UNIV,BONNER NUCL LAB,HOUSTON,TX 77251. RP ETKIN, A (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 2 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 224 EP 227 DI 10.1016/0168-9002(92)90293-D PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600032 ER PT J AU BOYARSKI, A BRIGGS, D BURCHAT, PR AF BOYARSKI, A BRIGGS, D BURCHAT, PR TI STUDIES OF HELIUM BASED DRIFT CHAMBER GASES FOR HIGH-LUMINOSITY LOW-ENERGY MACHINES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH ID MIXTURE AB Future high luminosity low energy machines will need low mass tracking chambers in order to minimize multiple scattering of the relatively low momentum tracks produced at these facilities. A drift chamber using a helium based gas rather than a conventional argon based gas would greatly reduce the amount of multiple scattering. This paper summarizes measurements of the drift velocity and position resolution for gas mixtures of helium with CO2 and isobutane and helium with DME. Good spatial resolutions are obtained. A design of a drift chamber with only 0.12% of a radiation length (gas plus wire) over a 60 cm tracking distance is presented. C1 UNIV CALIF SANTA CRUZ,SANTA CRUZ INST PARTICLE PHYS,SANTA CRUZ,CA 95064. RP BOYARSKI, A (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 12 TC 4 Z9 4 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 267 EP 272 DI 10.1016/0168-9002(92)90301-J PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600040 ER PT J AU BARR, GD BUCHHOLZ, P CAROSI, R COWARD, D CUNDY, D DOBLE, N GATIGNON, L GONIDEC, A HALLGREN, B KESSELER, G LACOURT, A LAVERRIERE, G LINSER, G MAST, M SCHILLY, P SCHINZEL, D SEIDL, W TAUREG, H WAHL, H WICHT, P BERTANZA, L BIGI, A CALAFIURA, P CASALI, R CERRI, C FANTECHI, R GENNARO, G GORINI, B MANNELLI, I MARZULLI, V PIERAZZINI, G SCHIUMA, D SERGIAMPIETRI, F BEDEREDE, D DEBEER, M DEBU, P PEYAUD, B KREUTZ, A GRIESMAYER, E MARKYTAN, M NEUHOFER, G PERNICKA, M TAUROK, A VIEHHAUSER, G WULZ, CE AF BARR, GD BUCHHOLZ, P CAROSI, R COWARD, D CUNDY, D DOBLE, N GATIGNON, L GONIDEC, A HALLGREN, B KESSELER, G LACOURT, A LAVERRIERE, G LINSER, G MAST, M SCHILLY, P SCHINZEL, D SEIDL, W TAUREG, H WAHL, H WICHT, P BERTANZA, L BIGI, A CALAFIURA, P CASALI, R CERRI, C FANTECHI, R GENNARO, G GORINI, B MANNELLI, I MARZULLI, V PIERAZZINI, G SCHIUMA, D SERGIAMPIETRI, F BEDEREDE, D DEBEER, M DEBU, P PEYAUD, B KREUTZ, A GRIESMAYER, E MARKYTAN, M NEUHOFER, G PERNICKA, M TAUROK, A VIEHHAUSER, G WULZ, CE TI THE NA48 LIQUID KRYPTON PROTOTYPE CALORIMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH AB The NA48 experiment for a precision measurement of the CP violation parameter epsilon'/epsilon in K0 --> 2pi decays will require a fast electromagnetic calorimeter with excellent energy and time resolution. A quasi homogeneous calorimeter using liquid krypton and a fast readout with 40 MHz FADCs is proposed. A prototype with 400 kg of liquid krypton was built and tested in an electron beam. Results for the energy, space and time resolution of this prototype are given. C1 INFN,SCUOLA NORMALE,I-56010 PISA,ITALY. UNIV PISA,I-56010 PISA,ITALY. CE SACLAY,DAPNIA,F-91191 GIF SUR YVETTE,FRANCE. UNIV GESAMTHSCH SIEGEN,W-5900 SIEGEN 21,GERMANY. AUSTRIAN ACAD SCI,INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. SLAC,STANFORD,CA. RP BARR, GD (reprint author), CERN,CH-1211 GENEVA,SWITZERLAND. RI Wulz, Claudia-Elisabeth/H-5657-2011 OI Wulz, Claudia-Elisabeth/0000-0001-9226-5812 NR 10 TC 8 Z9 8 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 393 EP 397 DI 10.1016/0168-9002(92)90320-4 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600059 ER PT J AU YU, B RADEKA, V SMITH, GC OBRIEN, E AF YU, B RADEKA, V SMITH, GC OBRIEN, E TI INTERPOLATING CATHODE PAD READOUT IN GAS PROPORTIONAL DETECTORS FOR HIGH MULTIPLICITY PARTICLE TRACKS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH ID CHAMBERS; RESOLUTION AB Experiments which are planned for the Superconducting Super Collider and the Relativistic Heavy Ion Collider will involve interactions in which detectors Will identify and localize hundreds or even thousands of particle tracks simultaneously. Most types of conventional position sensitive, proportional detectors with projective geometry are not able to unravel the individual tracks in these environments. We have been investigating several forms of subdivided cathode readout to address this problem. We report here on geometric charge division using chevron shaped cathode pads which lie in rows underneath each anode wire. Investigations have quantified the nonlinear effects due to avalanche angular localization, and how these become negligible with proper design of the cathode pad. Differential nonlinearity of +/-5%, and position resolution in the region of 50 mum rms, have been achieved. RP YU, B (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD DEC 1 PY 1992 VL 323 IS 1-2 BP 413 EP 418 DI 10.1016/0168-9002(92)90325-X PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600064 ER PT J AU CRAWFORD, H GARABATOS, C GREINER, L GRUHN, CR AF CRAWFORD, H GARABATOS, C GREINER, L GRUHN, CR TI TEMPORAL STUDIES OF A MWPC AT HIGH-PRESSURES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL WIRE CHAMBER CONF CY FEB 17-21, 1992 CL VIENNA, AUSTRIA SP BUNDESMINIST WISSENSCH & FORSCH, FREMDENVERKEHRSVERBAND WIEN, BUNDESKAMMER GEWERBLICHEN WIRSCH AB We report on results achieved by recording the waveforms produced by a common multiwire proportional chamber (MWPC). Data were taken using a Sr-90 source at pressures between 6 and 43 atm and voltages over a range of gains allowing the current signal to be viewed directly into 50 OMEGA on a Tektronix CSA 803 digital processing oscilloscope. A systematic study was made using an argon-methane (90-10) gas mixture. A fastest rise time per amplitude of 40 ps/mV was observed at 22 atm. Faster signals have been observed by mixing a small fraction of freon 13B1 in an argon-methane (90-10) gas mixture, thus limiting the charge transport efficiency to a region near the anode wires. This yielded a rise time per amplitude of almost-equal-to 5 ps/mV. In this way, average rise times in the raw signals of a few hundred picoseconds have been observed at 20 atm. Time spectra acquired with the use of an external scintillator trigger are also shown. RP CRAWFORD, H (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 3 TC 0 Z9 0 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 DEC 1 PY 1992 VL 323 IS 1-2 BP 424 EP 430 DI 10.1016/0168-9002(92)90327-Z PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KD976 UT WOS:A1992KD97600066 ER PT J AU MACGREGOR, MH REFFO, G AF MACGREGOR, MH REFFO, G TI FAST-NEUTRON-INDUCED REACTIONS ON ZINC ISOTOPES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB A model calculation is presented of neutron-induced reaction cross-sections on Zn isotopes in the energy range 1-30 MeV. The theoretical nuclear models and the codes used are described, together with the method employed to obtain the model parameters. C1 ENEA,BOLOGNA,ITALY. RP MACGREGOR, MH (reprint author), LAWRENCE LIVERMORE NATL LAB,L-298,LIVERMORE,CA 94550, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD DEC PY 1992 VL 72 IS 3-4 BP 302 EP 318 DI 10.1016/0168-583X(92)95124-A PG 17 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KE736 UT WOS:A1992KE73600002 ER PT J AU WHITE, AR AF WHITE, AR TI LIGHT QUARKS AND SMALL X-PHYSICS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1992 ZEUTHEN WORKSHOP ON ELEMENTARY PARTICLE THEORY : DEEP INELASTIC SCATTERING CY APR 06-10, 1992 CL TEUPITZ, GERMANY SP DESY ID HIGH-ENERGY BEHAVIOR; ABELIAN GAUGE-THEORY; SEMIHARD PROCESSES; S APPROXIMATION; QCD; POMERON; MODEL AB The significance of the low k(perpendicular-to) part of the Lipatov equation for the QCD soft Pomeron is discussed. It is then argued that light quarks are essential for the emergence of confinement and a Pomeron with the right physical properties. The implications for small x parton distributions are considered. RP WHITE, AR (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 26 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD DEC PY 1992 SU 29A BP 77 EP 83 DI 10.1016/0920-5632(92)90426-S PG 7 WC Physics, Particles & Fields SC Physics GA KF213 UT WOS:A1992KF21300013 ER PT J AU WARD, BFL AF WARD, BFL TI ON GAUGE-INVARIANCE OF THE RENORMALIZED Z(0) REST MASS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT 1992 ZEUTHEN WORKSHOP ON ELEMENTARY PARTICLE THEORY : DEEP INELASTIC SCATTERING CY APR 06-10, 1992 CL TEUPITZ, GERMANY SP DESY ID SYMMETRIES AB The properly renormalized Z-degrees rest mass is shown to be gauge invariant in the rigorous, complete on-shell renormalization scheme. Thus, the mass measured at LEP/SLC is indeed a physical observable and can be used as a basic parameter of the SU2L X U1 theory, as indeed it has so been. C1 SLAC,STANFORD,CA 94309. CERN,DIV TH,GENEVA 23,SWITZERLAND. INT CTR THEORET PHYS,I-34100 TRIESTE,ITALY. RP WARD, BFL (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD DEC PY 1992 SU 29A BP 253 EP 257 PG 5 WC Physics, Particles & Fields SC Physics GA KF213 UT WOS:A1992KF21300037 ER PT J AU BALLINGER, CT RATHKOPF, JA MARTIN, WR AF BALLINGER, CT RATHKOPF, JA MARTIN, WR TI THE RESPONSE HISTORY MONTE-CARLO METHOD FOR ELECTRON-TRANSPORT SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB A new method, response history Monte Carlo (RHMC), has been developed for solving electron transport problems through homogeneous material, and it is more accurate than the conventional method for energies below a few hundred kilo-electron-volts. Since electrons can suffer thousands of collisions and lose only a fraction of their incident energy, analog Monte Carlo (single scatter) is extremely time-consuming. The conventional electron transport method avoids simulating single scattering events by modeling the effect of multiple collisions. This condensed history method requires assumptions that are invalid at lower energies to analytically determine probability distribution functions (pdf's) representing the electron state after multiple collisions. Like the condensed history method, the RHMC method uses an approximate random walk where each step represents the cumulative effect of many collisions. However, the RHMC method is more accurate than the condensed history method since the multiscattered electron state is sampled from pdf's predetermined by analog Monte Carlo calculations instead of approximate analytic solutions. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV MICHIGAN,ANN ARBOR,MI 48109. NR 18 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD DEC PY 1992 VL 112 IS 4 BP 283 EP 295 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KA325 UT WOS:A1992KA32500001 ER PT J AU BADRUZZAMAN, A AF BADRUZZAMAN, A TI ASYMPTOTIC ANALYSIS OF THE FINITE MOMENTS TRANSPORT METHOD IN OPTICALLY THICK MEDIA SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID MEAN FREE PATHS; DIFFUSIVE REGIMES AB A theoretical analysis is presented that assesses the accuracy of the finite moments transport method in optically thick, scattering-dominated media. Two algorithms of the method, originally developed for neutronics problems, are considered. One algorithm uses a truncated balance relation, and the other uses a nodal integral relation to close the system of generalized balance equations that arise in the method. The analysis utilizes an asymptotic expansion of the flux with respect to a small parameter, epsilon, which is the ratio of the mean free path of the radiation to a typical dimension of the domain. The behavior of the algorithms is analyzed both in the interior, where the correct solution is that of a diffusion equation, and near the boundary, where the flux should decay exponentially at a rate proportional to 1/epsilon. Relations valid for an arbitrary number of moments, and that contain earlier results for low-order neutronics methods as special cases, are derived for slab geometry. Preliminary conclusions are also drawn on the asymptotic and boundary-layer behaviors of the two finite moments algorithms in (x-y) geometry. Similar results are discussed for the finite moments algorithms to solve the time-dependent Boltzmann equation. The finite moments nodal integral scheme appears to be vastly superior to conventional deterministic schemes and higher order truncated balance schemes in optically thick problems. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP BADRUZZAMAN, A (reprint author), CHEVRON OIL FIELD RES CO,POB 446,LA HABRA,CA 90633, USA. NR 26 TC 1 Z9 1 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD DEC PY 1992 VL 112 IS 4 BP 321 EP 335 PG 15 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KA325 UT WOS:A1992KA32500004 ER PT J AU GOLES, RW HOLTON, LK SEVIGNY, GJ AF GOLES, RW HOLTON, LK SEVIGNY, GJ TI BEHAVIOR OF MERCURY IN HIGH-TEMPERATURE VITRIFICATION PROCESSES SO NUCLEAR TECHNOLOGY LA English DT Article DE HIGH-LEVEL WASTE VITRIFICATION; MERCURY BEHAVIOR; OFF-GAS TREATMENT AB The Pacific Northwest Laboratory (PNL) has evaluated the waste processing behavior of mercury in simulated defense waste. A series of tests was performed under various operating conditions using an experimental-scale liquid-fed ceramic melter (LFCM). This solidification technology had no detectable capacity for incorporating mercury into its product, borosilicate glass. Essentially all the mercury fed to the melter was lost to the off-gas system as gaseous effluent. An ejector venturi scrubber condensed and collected 97% of the mercury evolved from the melter. Chemically, the condensed mercury effluent was composed almost entirely of chlorides, and except in a low-temperature test, Hg2Cl2 was the primary chloride formed. As a result, combined mercury accounted for most of the insoluble mass collected by the process quench scrubber. Although macroscopic quantities of elemental mercury were never observed in process secondary waste streams, finely divided and dispersed mercury that blackened all condensed Hg2Cl2 residues was capable of saturating the quenched process exhaust with mercury vapor. The vapor pressure of mercury, however, in the quenched melter exhaust was easily and predictably controlled with the off-gas stream chiller. These tests followed 12 earlier experiments performed at PNL to study the behavior of mercury during vitrification of simulated typical defense waste. The experiments were conducted using an experimental-scale spray calciner/in-can melter (SC/ICM) system plus a very similar off-gas system. Results with both the LFCM and SC/ICM technologies were essentially the same. Just as with the LFCM, the mercury was completely volatilized from the in-can melter system in all experiments. It reacted predominantly with halogens to form a fine particulate solid, most of which was deposited in the off-gas system piping. RP GOLES, RW (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 5 TC 0 Z9 0 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD DEC PY 1992 VL 100 IS 3 BP 310 EP 321 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JY740 UT WOS:A1992JY74000004 ER PT J AU GAT, U ENGEL, JR DODDS, HL AF GAT, U ENGEL, JR DODDS, HL TI MOLTEN-SALT REACTORS FOR BURNING DISMANTLED WEAPONS FUEL SO NUCLEAR TECHNOLOGY LA English DT Note DE MOLTEN SALT REACTOR; DISMANTLED WEAPONS FUELS; ADVANCED REACTOR AB The molten salt reactor (MSR) option for burning fissile fuel from dismantled weapons is examined. It is concluded that MSRs are potentially suitable for beneficial utilization of the dismantled fuel. The MSRs have the flexibility to utilize any fissile fuel in continuous operation with no special modifications, as demonstrated in the Molten Salt Reactor Experiment, while maintaining their economy. The MSRs further require a minimum of special fuel preparation and can tolerate denaturing and dilution of the fuel. Fuel shipments can be arbitrarily small, which may reduce the risk of diversion. The MSRs have inherent safety features that make them acceptable and attractive. They can burn a fuel type completely and convert it to other fuels. The MSRs also have the potential for burning the actinides and delivering the waste in an optimal form, thus contributing to the solution of one of the major remaining problems for deployment of nuclear power. C1 UNIV TENNESSEE,DEPT NUCL ENGN,KNOXVILLE,TN 37996. RP GAT, U (reprint author), OAK RIDGE NATL LAB,POB 2009,BLDG 9108,OAK RIDGE,TN 37831, USA. NR 21 TC 5 Z9 5 U1 0 U2 3 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD DEC PY 1992 VL 100 IS 3 BP 390 EP 394 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JY740 UT WOS:A1992JY74000010 ER PT J AU BURNS, TP AF BURNS, TP TI FITNESS IN CLONAL ORGANISMS - A SPECIAL CASE OF EXTENSIVE FITNESS SO OIKOS LA English DT Editorial Material RP BURNS, TP (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, 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 0030-1299 J9 OIKOS JI Oikos PD DEC PY 1992 VL 65 IS 3 BP 535 EP 537 DI 10.2307/3545572 PG 3 WC Ecology SC Environmental Sciences & Ecology GA KB347 UT WOS:A1992KB34700023 ER PT J AU NICHOLS, TD KYRALA, GA AF NICHOLS, TD KYRALA, GA TI MEASUREMENT OF IRRADIANCE DISTRIBUTION AT THE FOCUS OF A HIGH-IRRADIANCE LASER-BEAM SO OPTICAL ENGINEERING LA English DT Article DE IRRADIANCE DISTRIBUTION; HIGH-IRRADIANCE LASER SYSTEM; PINHOLE; WAIST RADIUS; M2 MODEL; RANDOM MOTION ID MULTIPHOTON IONIZATION; ATOMIC-HYDROGEN; RARE-GASES; 1.06 MUM; PULSE AB Two new analysis techniques used to characterize a non-diffraction-limited pulsed laser system whose focal spot is too intense to record photographically and whose pointing varies in time are described. The data to be analyzed were collected by moving the focal point in three dimensions and recording the fraction of the incident energy that passed through a pinhole. Analyzing the data in two different ways provides two independent estimates of the properties of the laser beam that are in reasonable agreement. One method estimates the average size of the focal volume over the measurement period, whereas the other estimates its minimum size. The difference between the average and the minimum then indicates the range of variation in size. Two different estimates of the random motion of the beam are also obtained. Both analysis methods employ statistics to account for pulse-to-pulse variations in the size, location, and total energy of the pulses. Beam widths at different points along the beam axis can then be fit with the M2 model, which describes beams that are not diffraction limited, to provide a simple expression for the irradiance at any point in the focal volume. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 27 TC 0 Z9 0 U1 2 U2 5 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 2647 EP 2656 DI 10.1117/12.60021 PG 10 WC Optics SC Optics GA KB842 UT WOS:A1992KB84200016 ER PT J AU BRAUN, RL BURNHAM, AK AF BRAUN, RL BURNHAM, AK TI PMOD - A FLEXIBLE MODEL OF OIL AND GAS GENERATION, CRACKING, AND EXPULSION SO ORGANIC GEOCHEMISTRY LA English DT Article; Proceedings Paper CT 15TH INTERNATIONAL MEETING ON ORGANIC GEOCHEMISTRY : ADVANCES IN ORGANIC GEOCHEMISTRY 1991 CY SEP 16-20, 1991 CL UNIV MANCHESTER, MANCHESTER, ENGLAND HO UNIV MANCHESTER DE KEROGEN; PYROLYSIS; EXPULSION; COMPACTION; PETROLEUM; OIL; CRACKING; PRIMARY MIGRATION; COMPUTER MODEL ID SOURCE ROCKS; HYDROUS PYROLYSIS; KEROGEN; DEGRADATION AB A new computer program, PMOD, is used to develop and test a wide variety of global models of varied complexity for the generation and destruction of hydrocarbons from petroleum source rocks. Chemical reaction models are constructed interactively by supplying the empirical formula of the reactants and products, desired reactions, and reaction constraints. PMOD calculates stoichiometric coefficients that conserve elemental balance. The chemical reactions are integrated into two compaction and bulk-flow expulsion models in order to predict the amounts and compositions of products expelled from the source rock under geological conditions. A variety of published and unpublished experiments are used to show when various model types are required and to derive the parameters for the various models. This exercise provides a good means to compare the strengths and weaknesses of the various models and provides guidance on the types of information needed to calibrate them. Chemical properties calculated by PM OD for all models include apparent Rock-Eval parameters and other common geochemical measurements. RP BRAUN, RL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 25 TC 46 Z9 50 U1 1 U2 8 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-6380 J9 ORG GEOCHEM JI Org. Geochem. PD DEC PY 1992 VL 19 IS 1-3 BP 161 EP 172 DI 10.1016/0146-6380(92)90034-U PG 12 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KG704 UT WOS:A1992KG70400014 ER PT J AU TANG, K ALLMAN, SL JONES, RB CHEN, CH AF TANG, K ALLMAN, SL JONES, RB CHEN, CH TI COMPARISON OF RHODAMINE DYES AS MATRICES FOR MATRIX-ASSISTED LASER DESORPTION IONIZATION MASS-SPECTROMETRY SO ORGANIC MASS SPECTROMETRY LA English DT Letter ID LARGE BIOMOLECULES RP TANG, K (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. RI Allman, Steve/A-9121-2011; Tang, Kai/A-2194-2011 OI Allman, Steve/0000-0001-6538-7048; NR 11 TC 34 Z9 34 U1 0 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0030-493X J9 ORG MASS SPECTROM JI Org. Mass Spectrom. PD DEC PY 1992 VL 27 IS 12 BP 1389 EP 1392 DI 10.1002/oms.1210271211 PG 4 WC Chemistry, Organic; Spectroscopy SC Chemistry; Spectroscopy GA KD919 UT WOS:A1992KD91900009 ER PT J AU LEMKE, FR BULLOCK, RM AF LEMKE, FR BULLOCK, RM TI INSERTION AND BETA-HYDRIDE ELIMINATION-REACTIONS OF RUTHENIUM ZIRCONIUM COMPLEXES CONTAINING C-2 BRIDGES WITH BOND ORDERS OF 1, 2, AND 3 SO ORGANOMETALLICS LA English DT Article ID TRANSITION-METAL COMPLEXES; CARBON-DIOXIDE; ORGANIC-SYNTHESIS; HYDROZIRCONATION; CHEMISTRY; REACTIVITY; MONOXIDE; DERIVATIVES; ACTIVATION; REAGENTS AB Carbon dioxide inserts into the Zr-C bond of Cp(PMe3)2RuCH=CHZrClCp2, producing the carboxylate complex Cp(PMe3)2RuCH=CHCO2ZrClCP2. An eta2-iminoacyl insertion product, Cp(PMe3)2Ru-C=C-C(NtBu)ZrClCP2, results from insertion of tBuNC into the Zr-C bond of the dimetalloalkyne complex Cp(PMe3)2Ru-C=C-ZrClCp2. The reaction of Cp(PMe3)2RuCH2CH2ZrClCp2 with high concentrations of tBuNC also produces an eta2-iminoacyl insertion product, Cp(PMe3)2RuCH2CH2C(NtBu)ZrClCp2. At low concentrations of tBuNC, a competing reaction is beta-hydride elimination from Cp(PMe3)2RuCH2CH2ZrClCp2 to give Cp(PMe3)2RuCH=CH2 and CP2Zr(H)Cl, which is trapped by tBuNC under these conditions to give Cp2ZrCl(eta2-tBuN=CH). The reaction of benzophenone with Cp(PMe3)2RuCH2CH2ZrClCp2 gives the insertion product Cp(PMe3)2RuCH2CH2CPh2OZrClCP2. Beta-Hydride elimination is also observed from Cp(PMe3)2RuCH=CHZrClCp2; in the presence of excess nBuC=CH, the products are Cp(PMe3)2Ru-C=C-H and the zirconium vinyl complex CP2Zr(CI)CH=CHnBu. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Bullock, R. Morris/L-6802-2016 OI Bullock, R. Morris/0000-0001-6306-4851 NR 38 TC 16 Z9 16 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD DEC PY 1992 VL 11 IS 12 BP 4261 EP 4267 DI 10.1021/om00060a051 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA KC392 UT WOS:A1992KC39200051 ER PT J AU HOU, PY STRINGER, J AF HOU, PY STRINGER, J TI OXIDE SCALE ADHESION AND IMPURITY SEGREGATION AT THE SCALE METAL INTERFACE SO OXIDATION OF METALS LA English DT Article DE SULFUR SEGREGATION; SCALE ADHESION; AL2O3 SCALE; CR2O3 SCALE; SCALE ALLOY INTERFACE; SCRATCH ADHESION TEST; MICROINDENTATION ID SULFUR; ADHERENCE; GROWTH; ALLOYS; OXIDATION; ALUMINA; SURFACE AB The chemistry at scale/metal interfaces was studied using scanning Auger microscopy after removal of the scale in ultra-high vacuum using an in situ scratching technique. Al2O3 and Cr2O3 scales formed between 900-degrees-C and 1100-degrees-C on Fe-18 wt.% Cr-5 wt.% Al and on Ni-25 wt.% Cr alloys, respectively, were investigated. The adhesion of these scales was determined qualitatively by way of micro-indentation and scratching on the surface oxide. All of the alumna scales fractured to the same degree to expose the metal surface, regardless of the oxidation temperature. The chromia-forming alloy on the other hand, developed more adherent scales at lower oxidation temperatures. About 20 at.% sulfur was found at the metal surface in all cases, and its presence was not only detected on interfacial voids, but also on areas where the scale was in contact with the alloy at temperature. Results from this study clearly demonstrated that sulfur as an alloying impurity does segregate to the scale/alloy interface. However, for alumina scales and chromia scales, the effect of this segregation on oxide adhesion is noticeably different. C1 ELECT POWER RES INST,PALO ALTO,CA 94304. RP HOU, PY (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 26 TC 158 Z9 164 U1 2 U2 21 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0030-770X J9 OXID MET JI Oxid. Met. PD DEC PY 1992 VL 38 IS 5-6 BP 323 EP 345 DI 10.1007/BF00665658 PG 23 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KE908 UT WOS:A1992KE90800001 ER PT J AU Froelich, PN Blanc, V Mortlock, RA Chillrud, SN Dunstan, W Udomkit, A Peng, TH AF Froelich, P. N. Blanc, V. Mortlock, R. A. Chillrud, S. N. Dunstan, W. Udomkit, A. Peng, T. -H. TI RIVER FLUXES OF DISSOLVED SILICA TO THE OCEAN WERE HIGHER DURING GLACIALS: Ge/Si IN DIATOMS, RIVERS, AND OCEANS SO PALEOCEANOGRAPHY LA English DT Article AB Two centric marine diatom species, Thalassiosira oceanica and Thalassiosira antarctica, were grown in batch cultures to determine the incorporation of germanium (Ge) and silicon (Si) into siliceous shells (opal). The results were modeled as Ge/Si isotope fractionation. During exponential growth, diatoms take up and incorporate Ge/Si from solution without major discrimination against Ge. During stationary phase growth near silica limitation, the Antarctic species (T. antarctica) discriminates slightly against Ge but integrated (Ge/Si)opal produced over the latter portion of the growth cycle is indistinguishable from the initial solution ratio. These results confirm experiments using radioactive 68Ge that showed absence of fractionation during diatom silica uptake (Azam and Volcani, 1981), in contrast to two-box ocean models that invoke 50% Ge discrimination by diatoms to explain the observed excess surface ocean germanium concentration (Murnane and Stallard, 1988; Froelich et al., 1989) and late Pleistocene ocean sediment (Ge/Si)opal records (Mortlock et al., 1991). Runs of a 10-box ocean Ge and Si model (PANDORA) with 50% discrimination reproduce the excess surface ocean Ge but introduces curvature into the deep ocean Ge versus Si relationship that is not observed in the oceans. Thus 50% fractionation is not supported by either cultures or models. If diatoms do not fractionate Ge/Si, then late Pleistocene (Ge/Si)(opal) variations in piston cores are caused not by changes in local biosiliceous production and silica utilization (Mortlock et al, 1991) but rather by whole ocean changes in (Ge/Si)(seawater). The marine (Ge/Si)(opal) record of the last 450 kyr can be modeled as transient oceanic responses to instantaneous continental climate transitions consistent with the chemical weathering model of Murnane and Stallard (1990). Glacial periods are characterized by lower continental weathering intensity, lower (Ge/Si)(riv), and two fold higher dissolved silica river fluxes. Marine (Ge/Si)(opal) records thus contain a history of ocean silica chemistry that reflect rapid global changes in continental weathering. C1 [Froelich, P. N.; Blanc, V.; Mortlock, R. A.; Chillrud, S. N.] Columbia Univ, Lamont Doherty Geol Observ, Palisades, NY 10964 USA. [Froelich, P. N.; Mortlock, R. A.; Chillrud, S. N.] Columbia Univ, Dept Geol Sci, Palisades, NY 10964 USA. [Dunstan, W.; Udomkit, A.] Old Dominion Univ, Dept Oceanog, Norfolk, VA 23508 USA. [Peng, T. -H.] Oak Ridge Natl Lab, Div Environm Sci, Oak Ridge, TN 37830 USA. RP Froelich, PN (reprint author), Columbia Univ, Lamont Doherty Geol Observ, Palisades, NY 10964 USA. FU NSF [OCE89-12436] FX his research is supported by the Chemical Oceanography program of NSF [OCE89-12436) and represents a Lamont-Doherty contribution no. 5014. NR 45 TC 126 Z9 133 U1 2 U2 26 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0883-8305 J9 PALEOCEANOGRAPHY JI Paleoceanography PD DEC PY 1992 VL 7 IS 6 BP 739 EP 767 DI 10.1029/92PA02090 PG 29 WC Geosciences, Multidisciplinary; Oceanography; Paleontology SC Geology; Oceanography; Paleontology GA V23KI UT WOS:000208341300004 ER PT J AU ODOWD, NP STOUT, MG SHIH, CF AF ODOWD, NP STOUT, MG SHIH, CF TI FRACTURE-TOUGHNESS OF ALUMINA NIOBIUM INTERFACES - EXPERIMENTS AND ANALYSES SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID MIXED-MODE FRACTURE; BIMATERIAL INTERFACES; SOLIDS AB The mixed-mode interfacial fracture toughness of an alumina/niobium system is investigated. The interface was formed by solid-state bonding bulk Coor's AD-999 fine-grain alumina with a commercial purity niobium. The interface is very sharp; data acquired from high-resolution electron microscopy indicate that the width of the interface is no more than ten atomic planes. Furthermore the thermal expansion coefficients of the two materials differ by less than 5% so that residual stresses produced by the bonding process are minimal. The interfacial fracture toughness of the alumina/niobium system under tension-dominated load states and various combinations of in-plane shear and tension have been measured. For comparison purposes, the toughness of alumina under mixed-mode loading conditions was also measured. The fracture toughness of alumina is relatively insensitive to mode mixity. In contrast, the fracture toughness of the alumina-niobium interface depends strongly on mode mixity. At a phase angle of about 5-degrees, we measured an average interfacial toughness of 4 MPa m1/2 which is comparable with the toughness of homogeneous alumina. The measured toughness increases with increasing phase angle to a value of about 11 MPa m1/2 at a phase angle between 25 and 45-degrees. An explanation for the rapid increase in interface toughness with increasing phase angle, based on a maximum interface hoop-stress fracture criterion, is advanced. C1 BROWN UNIV,DIV ENGN,PROVIDENCE,RI 02912. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP ODOWD, NP (reprint author), CALTECH,GRAD AERONAUT LABS,PASADENA,CA 91125, USA. RI O'Dowd, Noel/B-6588-2008; MA&BE, Department/A-5579-2012; Irish Centre for Composites, Research (ICOMP)/D-4887-2011 OI O'Dowd, Noel/0000-0001-5717-8561; NR 30 TC 71 Z9 75 U1 0 U2 8 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD DEC PY 1992 VL 66 IS 6 BP 1037 EP 1064 PG 28 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA KC547 UT WOS:A1992KC54700010 ER PT J AU BHATTACHARYA, AK AF BHATTACHARYA, AK TI 3-DIMENSIONAL APPROACH FOR THE ANALYSIS OF EQUILIBRIUM SHAPES AND STRESSES IN DISLOCATION LOOP NETWORKS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID RANGE INTERNAL-STRESSES; ANISOTROPIC CRYSTALS; HIGH-TEMPERATURE; CREEP AB A three-dimensional method based on Brown's theorem has been developed to calculate the stress field of a collection of dislocation loops with arbitrary orientations. The method has been applied to a simplified structure composed of a three-dimensional arrangement of square dislocation loops. The results show that this method can be useful in the study of stability of dislocation loops and the development of stresses at any point in the dislocation network space. C1 STANFORD UNIV,DEPT MECH ENGN,STANFORD,CA 94305. LOS ALAMOS NATL LAB,DEPT MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP BHATTACHARYA, AK (reprint author), MAX PLANCK INST MET RES,SEESTR 92,W-7000 STUTTGART 80,GERMANY. NR 30 TC 0 Z9 0 U1 1 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD DEC PY 1992 VL 66 IS 6 BP 1105 EP 1119 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA KC547 UT WOS:A1992KC54700013 ER PT J AU ASELAGE, TL VENTURINI, EL VANDEUSEN, SB HEADLEY, TJ EATOUGH, MO VOIGT, JA AF ASELAGE, TL VENTURINI, EL VANDEUSEN, SB HEADLEY, TJ EATOUGH, MO VOIGT, JA TI PHASE-STABILITY AND PROPERTIES OF NEAR-EQUILIBRIUM TL-CA-BA-CU-O SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; X-RAY-DIFFRACTION; CRYSTAL-STRUCTURE; THALLIUM CUPRATE; TL2BA2CA2CU3O10; OXIDE; TL2CABA2CU2O8-X; TL2BA2CACU2O8; NEUTRON; TC AB High-temperature phase stability limits of Tl-Ca-Ba-Cu-O superconductors were determined as a function of Tl2O partial pressure at constant O2 Partial pressure (almost-equal-to 630 Torr), sample temperature (880-degrees-C), and sample Ca:Ba:Cu ratio (1:2:2, 2:2:3, and 3:2:4). Both phases with double CuO2 sheets in the structure, 2122 and 1122, were stable over wide ranges of P(Tl2O) for stoichiometric (1:2:2) samples. At relatively high P(Tl2O), 2122 was also the stable superconducting phase even for the Ca- and Cu-rich stoichiometries. Energy-dispersive X-rav spectra and c-axis differences suggested variable cation stoichiometry in 1122 and 2122 prepared under such a range of conditions. However, the superconducting transition temperatures and a-axes of both 1122 and 2122 were nearly constant for all conditions of preparation, suggesting a nearly constant carrier density. No range of P(Tl2O) was found where either 1223 or 2223 was stable as a single superconducting phase for the P(O2) and temperature employed. Intergrown mixtures of 1223 and 2223 or Tl-free phases were found when P(Tl2O) was below the 2122 formation boundary. RP ASELAGE, TL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 43 TC 23 Z9 24 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD DEC 1 PY 1992 VL 203 IS 1-2 BP 25 EP 36 DI 10.1016/0921-4534(92)90504-6 PG 12 WC Physics, Applied SC Physics GA KB315 UT WOS:A1992KB31500004 ER PT J AU KRAMER, MJ QIAN, Q FINNEMORE, D SNEAD, L AF KRAMER, MJ QIAN, Q FINNEMORE, D SNEAD, L TI TIME EVOLVED DEFECTS IN PROTON-IRRADIATED SINGLE-CRYSTAL YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article ID VORTEX CONFINEMENT; COLUMNAR DEFECTS; HIGH FIELDS; TEMPERATURES; IONS AB Defects due to 200 MeV proton irradiation of single-crystal YBa2Cu3O7-delta at fluxes from 10(14) to 10(16) protons/cm2 have been examined with transmission electron microscopy (TEM) using both diffraction contrast and lattice imaging. TEM foils were prepared from single-crystals and characterized prior to irradiation for intrinsic defects. The TEM foils were irradiated at 200 MeV with the beam parallel to the c-axis, Defects with anisotropic strain contrast were not observed in foils examined within days of irradiation for fluences up to 10(15) p/cm2. After aging for over 90 days, the same samples which originally showed no defects consistent with irradiation damage, showed defects with anisotropic strain contrast. Lattice imaging showed two types of defects, small clusters (approximately 0.5 nm) with no special orientation and extended defects 2 to 7 nm in length and 0.2 nm thick which concentrate along the {100}[010]. The lattice image, TRIM calculations and DC magnetization data are consistent with these extended defects being Cu-O extrinsic stacking faults. These data imply that protons produce predominantly point defects of Cu and O which cluster over time. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP KRAMER, MJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 14 TC 3 Z9 4 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 DEC 1 PY 1992 VL 203 IS 1-2 BP 83 EP 90 DI 10.1016/0921-4534(92)90511-A PG 8 WC Physics, Applied SC Physics GA KB315 UT WOS:A1992KB31500011 ER PT J AU STAPP, HP AF STAPP, HP TI NOISE-INDUCED REDUCTION OF WAVE-PACKETS AND FASTER-THAN-LIGHT INFLUENCES SO PHYSICAL REVIEW A LA English DT Article ID ENVIRONMENT; COLLAPSE AB A simple proof is given of a recent claim [P. Pearle, Phys. Rev. A 39, 2277 (1989)] that appropriately coupled classical white noise reduces wave packets of macroscopic objects. Three difficulties with the classical mechanism are noted. All three are resolved by passing to the quantum analog. The 2.7-K microwave background is effective in some cases. Quantum noise reduces the density matrix of observables, not the wave function itself. The relative merits and liabilities of these two kinds of reduction, called von Neumann reduction and Heisenberg reduction, respectively, are discussed. In this connection a new type of correlation experiment, devised by Hardy [Phys. Rev. Lett. 68, 2981 (1992)] is used to prove a theorem that says, essentially, that any ontological solution of the quantum measurement problem must admit either parallel worlds of the Everett kind or faster-than-light influences of some kind. RP LAWRENCE BERKELEY LAB, DIV PHYS, THEORET PHYS GRP, 1 CYCLOTRON RD, BERKELEY, CA 94720 USA. NR 31 TC 14 Z9 14 U1 0 U2 1 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 DEC 1 PY 1992 VL 46 IS 11 BP 6860 EP 6868 DI 10.1103/PhysRevA.46.6860 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KB946 UT WOS:A1992KB94600015 ER PT J AU HALKA, M BRYANT, HC JOHNSTONE, C MARCHINI, B MILLER, W MOHAGHEGHI, AH TANG, CY BUTTERFIELD, KB CLARK, DA COHEN, S DONAHUE, JB GRAM, PAM HAMM, RW HSU, A MACARTHUR, DW MACKERROW, EP QUICK, CR TIEE, J ROZSA, K AF HALKA, M BRYANT, HC JOHNSTONE, C MARCHINI, B MILLER, W MOHAGHEGHI, AH TANG, CY BUTTERFIELD, KB CLARK, DA COHEN, S DONAHUE, JB GRAM, PAM HAMM, RW HSU, A MACARTHUR, DW MACKERROW, EP QUICK, CR TIEE, J ROZSA, K TI BRANCHING RATIO OF THE H-(N=2) SHAPE RESONANCE SO PHYSICAL REVIEW A LA English DT Article ID ELECTRIC-FIELDS AB The relative photodetachment cross section for decay into the H(N = 2) channel by the 1P-degrees shape resonance in H- was measured, as well as that for decay into all channels. The branching ratio sigma(N = 2)/sigma(total) was computed for a series of energies between 10.95 and 11.3 eV after normalizing the cross sections to theoretical peak amplitudes. The maximum branching ratio (almost-equal-to 0.8) appears at an energy about 20 meV higher than the central energy of the resonance. Results are compared with recent theoretical calculations. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. HUNGARIAN ACAD SCI,H-1361 BUDAPEST 5,HUNGARY. RP HALKA, M (reprint author), UNIV NEW MEXICO,DEPT PHYS & ASTRON,ALBUQUERQUE,NM 87131, USA. NR 27 TC 35 Z9 35 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 6942 EP 6948 DI 10.1103/PhysRevA.46.6942 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KB946 UT WOS:A1992KB94600026 ER PT J AU SAMSON, JAR BARTLETT, RJ HE, ZX AF SAMSON, JAR BARTLETT, RJ HE, ZX TI PROBABILITY FOR DOUBLE PHOTOIONIZATION OF HE AND NE SO PHYSICAL REVIEW A LA English DT Note ID ELECTRON-IMPACT IONIZATION; RARE-GASES; MULTIPLE PHOTOIONIZATION; CROSS-SECTIONS; 2 ELECTRONS; HELIUM; THRESHOLD; IONS; AR+ AB The proportionality between the probability for producing a doubly charged ion by photon impact on a neutral atom and electron impact on a singly charged ion is discussed. An energy-dependent parameter is introduced that expands the proportionality from threshold to 500 eV for He and to 360 eV for Ne. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SAMSON, JAR (reprint author), UNIV NEBRASKA,LINCOLN,NE 68588, USA. NR 41 TC 48 Z9 48 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 7277 EP 7280 DI 10.1103/PhysRevA.46.7277 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KB946 UT WOS:A1992KB94600062 ER PT J AU MANSON, ST DUBOIS, RD AF MANSON, ST DUBOIS, RD TI MULTIELECTRON TRANSITIONS RESULTING FROM INTERACTIONS BETWEEN TARGET AND PROJECTILE ELECTRONS IN IONIZING COLLISIONS SO PHYSICAL REVIEW A LA English DT Note ID ATOMIC-COLLISIONS AB Interactions between target and projectile electrons leading to ionization of one of the collision partners and simultaneous excitation of the other are investigated for fast clothed-particle-clothed-particle collisions. For H-atom impact, the first Born approximation is used to demonstrate that the low-energy-electron emission is dominated by electron-electron rather than by electron-nucleus interaction processes. For a broad class of structured particle collision systems, the electron-electron interaction is shown to play an important, non-negligible, role. Doubly differential cross sections for energetic H-He collisions illustrate this point. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP MANSON, ST (reprint author), GEORGIA STATE UNIV, DEPT PHYS & ASTRON, ATLANTA, GA 30303 USA. NR 12 TC 6 Z9 6 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD DEC 1 PY 1992 VL 46 IS 11 BP R6773 EP R6776 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KB946 UT WOS:A1992KB94600001 ER PT J AU FORREST, JA BROOKS, RL HUNT, JL STENUM, B SCHOU, J SORENSEN, H GURTLER, P MAGNOTTA, F MAPOLES, ER SOUERS, PC COLLINS, GW AF FORREST, JA BROOKS, RL HUNT, JL STENUM, B SCHOU, J SORENSEN, H GURTLER, P MAGNOTTA, F MAPOLES, ER SOUERS, PC COLLINS, GW TI CONTINUUM EMISSION FROM IRRADIATED SOLID DEUTERIUM SO PHYSICAL REVIEW B LA English DT Article ID INFRARED-ABSORPTION; HYDROGEN; SPECTRA; HOSTS AB A new emission feature from the spectrum of irradiated solid deuterium has been observed in the very near-infrared spectral region. Experiments from three laboratories, using different excitation conditions, have confirmed the observation. Comparison of the timing and temperature dependence of the spectral feature to the information previously available from electron spin resonance studies of solid deuterium, points to atomic association as the underlying cause. We shall show the connection of this emission to the occurrence of thermal spikes and optical flashes, previously observed in solid deuterium. C1 RISO NATL LAB, EURATOM, DEPT PHYS, DK-4000 ROSKILDE, DENMARK. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. DESY, HAMBURGER SYNCHROTRONSTRAHLUNGSLAB, W-2000 HAMBURG 52, GERMANY. RP FORREST, JA (reprint author), UNIV GUELPH, DEPT PHYS, GUELPH N1G 2W1, ONTARIO, CANADA. NR 27 TC 8 Z9 8 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 21 BP 13820 EP 13824 DI 10.1103/PhysRevB.46.13820 PG 5 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400021 ER PT J AU KENKRE, VM KUS, M KATZ, JD AF KENKRE, VM KUS, M KATZ, JD TI EXPLANATION OF THE BARRIER-DEPRESSION EFFECT IN CERAMICS UNDERGOING MICROWAVE-HEATING SO PHYSICAL REVIEW B LA English DT Article AB Thermal runaway observations on a variety of materials including strontium titanate, zinc oxide, iron oxide, and alumina, have been explained successfully in terms of a recent theory, which involves absorbing entities such as vacancies, bivacancies, or interstitials, which have to overcome an energy barrier in order to absorb microwaves to a significant extent. However, there is a tendency, unexplained so far, for the energy-barrier values extracted in this fashion to be slightly smaller than those obtained from diffusion measurements. The source of this systematic discrepancy is discovered through the application of a stochastic analysis of the mobility of the ceramic materials. New barrier values are obtained from the thermal runaway observations and found to be in better agreement with diffusion experiments. C1 UNIV NEW MEXICO,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87475. RP KENKRE, VM (reprint author), UNIV NEW MEXICO,DEPT PHYS,ALBUQUERQUE,NM 87131, USA. RI Kus, Marek/N-3936-2014 OI Kus, Marek/0000-0002-2767-3251 NR 16 TC 9 Z9 9 U1 2 U2 7 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 13825 EP 13831 DI 10.1103/PhysRevB.46.13825 PG 7 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400022 ER PT J AU KEIMER, B BELK, N BIRGENEAU, RJ CASSANHO, A CHEN, CY GREVEN, M KASTNER, MA AHARONY, A ENDOH, Y ERWIN, RW SHIRANE, G AF KEIMER, B BELK, N BIRGENEAU, RJ CASSANHO, A CHEN, CY GREVEN, M KASTNER, MA AHARONY, A ENDOH, Y ERWIN, RW SHIRANE, G TI MAGNETIC EXCITATIONS IN PURE, LIGHTLY DOPED, AND WEAKLY METALLIC LA2CUO4 SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; FERMI-LIQUID THEORY; HIGH-TC OXIDES; LARGE-N LIMIT; NEUTRON-SCATTERING; NORMAL-STATE; SPIN FLUCTUATIONS; HEISENBERG-ANTIFERROMAGNET; CUO2 PLANE; DYNAMICS AB We report a comprehensive neutron-scattering study of the evolution of the magnetic excitations in La2-xSrxCuO4 for 0 less-than-or-equal-to x less-than-or-equal-to 0.04. We first present accurate measurements of the magnetic correlation length and the sublattice magnetization of a carrier-free La2CuO4 crystal and analyze these in the context of recent theoretical predictions. We then systematically investigate the influence of different dopants on the magnetism: Our measurements indicate that static vacancies in the La2Cu1-yZnyO4 system affect the magnetic correlations in a similar manner as electrons in Pr2-xCexCuO4. The magnetic correlation length is much more rapidly suppressed as a function of x in La2-xSrxCuO4, and for x less-than-or-equal-to 0.04 we find that it obeys the empirical relation xi-1(x,T)=xi-1(x,0)+xi-1(0,T), where xi(0,T) is the measured correlation length of the carrier-free sample. We also report an extensive set of measurements of the dynamical magnetic response function of a crystal of composition La1.96Sr0.04CuO4 for excitation energies 0.75 less-than-or-equal-to omega less-than-or-equal-to 45 meV and temperatures 1.5 less-than-or-equal-to T less-than-or-equal-to 500 K. The dc conductivity of this crystal exhibits three different regimes: metallic for T greater-than-or-equal-to 100 K, weakly localized for 100 greater-than-or-equal-to T greater-than-or-equal-to 10 K, and strongly localized below approximately 1 K. Our neutron measurements show that the generalized susceptibility of this sample follows a surprisingly simple scaling function in the variable omega/T. This observation allows us to relate our data to a variety of normal-state properties of the layered copper oxides, in particular the dc and ac conductivities. Finally, at temperatures below approximately 20 K a "central peak" with a characteristic energy scale of less than 0.1 meV becomes prominent. Its relation to the localization of the charge carriers at low temperatures remains speculative. C1 TEL AVIV UNIV,SCH PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. TOHOKU UNIV,DEPT PHYS,SENDAI,MIYAGI 980,JAPAN. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP KEIMER, B (reprint author), MIT,CTR BIOBEHAV SCI,CAMBRIDGE,MA 02139, USA. NR 67 TC 517 Z9 519 U1 11 U2 47 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 14034 EP 14053 DI 10.1103/PhysRevB.46.14034 PG 20 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400051 ER PT J AU CANRIGHT, GS ROJO, AG AF CANRIGHT, GS ROJO, AG TI ELLIPSOMETRY AND BROKEN TIME-REVERSAL SYMMETRY IN THE HIGH-TEMPERATURE SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; CUPRATE SUPERCONDUCTORS; OPTICAL-PROPERTIES; THIN-FILMS; REFLECTION; YBA2CU3O7; BREAKING; PHASES; SEARCH; PLANES AB We discuss ellipsometric experiments seeking evidence of broken time-reversal symmetry in the high-temperature copper oxide superconductors. We use both a generalized symmetry analysis, and a magnetoelectric model suggested by Dzyaloshinskii, to argue that the hypothesis that best fits the various experimental results is the PT-invariance hypothesis-which assumes broken T symmetry in each plane, and antiferromagnetic (alternating) order of the broken symmetry in the c direction. We suggest two experimental tests of the PT-invariant model; one of these is sufficient to rule out any other broken-symmetry state and so has the potential to be extremely useful. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP CANRIGHT, GS (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 46 TC 25 Z9 25 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 21 BP 14078 EP 14088 DI 10.1103/PhysRevB.46.14078 PG 11 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400056 ER PT J AU LIU, LW KOUVEL, JS BRUN, TO AF LIU, LW KOUVEL, JS BRUN, TO TI ANISOTROPIC VORTEX-FLUX ROTATION IN GRAIN-ORIENTED YBA2CU3O7 SO PHYSICAL REVIEW B LA English DT Article ID TC OXIDE SUPERCONDUCTORS; O SINGLE-CRYSTALS; BA-CU-O; POLYCRYSTALLINE YBA2CU3O7 AB Magnetization-vector measurements were made at 4.2 K on a grain-oriented YBa2Cu3O7 sample rotated in the fixed external field H(e) that was initially applied in the a-b plane or along the c axis during cooling from above T(c). The penetrating vortex-flux component of the sample magnetization was determined as a vector (M(p)) over a complete rotational cycle, with diamagnetic shielding and demagnetization effects taken into account. At low H(e), M(p) turns rigidly with the rotating sample, and this simple behavior persists up to H(e) = 1 kOe when applied along c during cooling. However, for H(e) = 1 kOe applied along a-b during cooling, M(p) reverses its direction in the a-b plane periodically, while its magnitude varies roughly as the projection of H(e) on a-b. At higher H(e) (greater-than-or-equal-to 3 kOe), the rotational behavior of M(p) is the same for both field-cooling directions. One part of M(p) continues to show a periodic vortex motion in and out of the a-b plane, while another part stays fixed in direction relative to H(e) and thus turns frictionally relative to the rotating sample. The observed properties testify to a pronounced anisotropy of the vortex pinning forces, but many of their detailed features, including those that reveal a vortex cross-flux effect, are not yet clearly understood. C1 LOS ALAMOS NATL LAB,LANSCE,LOS ALAMOS,NM 87545. RP LIU, LW (reprint author), UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680, USA. NR 17 TC 7 Z9 7 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 21 BP 14113 EP 14118 DI 10.1103/PhysRevB.46.14113 PG 6 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400061 ER PT J AU SUNDAR, G HOYT, JJ SPOONER, S AF SUNDAR, G HOYT, JJ SPOONER, S TI NUCLEATION AND GROWTH IN AL-ZN - A TEST OF THE LANGER-SCHWARTZ MODEL SO PHYSICAL REVIEW B LA English DT Note ID CRITICAL NUCLEUS SHAPES; FCC-FCC NUCLEATION; X-RAY-SCATTERING; TRANSIENT KINETICS; MISCIBILITY GAP; ALUMINUM-ALLOYS; CRYSTALLOGRAPHY AB Small-angle x-ray scattering has been used to monitor the decrease in supersaturation with time in Al-Zn alloys following quenches into the metastable miscibility gap. The results demonstrate that the Langer-Schwartz model of nucleation and growth is accurate provided a time-dependent nucleation rate is included. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP SUNDAR, G (reprint author), WASHINGTON STATE UNIV,DEPT MECH & MAT ENGN,PULLMAN,WA 99164, USA. NR 35 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 21 BP 14266 EP 14269 DI 10.1103/PhysRevB.46.14266 PG 4 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400093 ER PT J AU HAMALAINEN, K KAO, CC HASTINGS, JB SIDDONS, DP BERMAN, LE STOJANOFF, V CRAMER, SP AF HAMALAINEN, K KAO, CC HASTINGS, JB SIDDONS, DP BERMAN, LE STOJANOFF, V CRAMER, SP TI SPIN-DEPENDENT X-RAY ABSORPTION OF MNO AND MNF2 SO PHYSICAL REVIEW B LA English DT Note ID POLARIZED PHOTOELECTRON DIFFRACTION; DICHROISM; IRON AB A method to measure spin-dependent x-ray-absorption spectra that does not require long-range magnetic order is presented. It is based on the spin dependence of the emission spectrum. Using a high-resolution spectrometer to separate and select the different spin-polarized final states in the K beta fluorescence spectrum of MnO and MnF2, spin-dependent absorption spectra in the vicinity of the Mn K edge were measured. Since this method uses the direction of the local magnetic moment as a reference it can be applied to paramagnetic and antiferromagnetic systems as well as to ferromagnetic. C1 UNIV HELSINKI,DEPT PHYS,SF-00170 HELSINKI 17,FINLAND. UNIV SAO PAULO,INST PHYS,BR-01498 SAO PAULO,BRAZIL. RP HAMALAINEN, K (reprint author), BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973, USA. RI Hamalainen, Keijo/A-3986-2010; stojanoff, vivian /I-7290-2012 OI Hamalainen, Keijo/0000-0002-9234-9810; stojanoff, vivian /0000-0002-6650-512X NR 18 TC 108 Z9 109 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 1 PY 1992 VL 46 IS 21 BP 14274 EP 14277 DI 10.1103/PhysRevB.46.14274 PG 4 WC Physics, Condensed Matter SC Physics GA KB634 UT WOS:A1992KB63400095 ER PT J AU MAILHIOT, C YANG, LH MCMAHAN, AK AF MAILHIOT, C YANG, LH MCMAHAN, AK TI POLYMERIC NITROGEN SO PHYSICAL REVIEW B LA English DT Article ID X-RAY-DIFFRACTION; NONLOCAL PSEUDOPOTENTIAL APPROACH; HIGH-PRESSURE; PHASE-TRANSITION; TOTAL-ENERGY; MOLECULAR DISSOCIATION; LIQUID-NITROGEN; LINEAR-RESPONSE; ELECTRON-GAS; CUBIC PHASE AB The equilibrium phase boundary between single-bonded, threefold-coordinated polymeric forms of nitrogen, and the observed, triple-bonded diatomic phases, is predicted to occur at relatively low (50 +/- 15 GPa) pressure. This conclusion is based on extensive local-density-functional total-energy calculations for polymeric structures (including that of black phosphorus, and another with all gauche dihedral angles) and diatomic structures (including that of the observed high-pressure epsilon-N2 phase). We believe the diatomic phase of nitrogen, observed up to 180 GPa and room temperature, to be metastable at these conditions, and that such hysteresis enhances the prospects for the existence of a metastable polymeric form of nitrogen at ambient conditions. In this regard, we show that the black-phosphorus and cubic gauche polymeric forms of nitrogen would encounter significant barriers along high-symmetry paths to dimerization at atmospheric pressure. RP MAILHIOT, C (reprint author), LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 71 TC 211 Z9 215 U1 6 U2 32 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 14419 EP 14435 DI 10.1103/PhysRevB.46.14419 PG 17 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500009 ER PT J AU BERLINER, R SMITH, HG COPLEY, JRD TRIVISONNO, J AF BERLINER, R SMITH, HG COPLEY, JRD TRIVISONNO, J TI STRUCTURES OF SODIUM METAL SO PHYSICAL REVIEW B LA English DT Article ID MARTENSITIC PHASE-TRANSFORMATION; PACKED POLYTYPIC CRYSTALS; SINGLE STACKING-FAULTS; NEUTRON-SCATTERING; LOW-TEMPERATURES; LITHIUM METAL; X-RAYS; DIFFRACTION; TRANSITION; BCC AB The martensitic transformation in sodium metal has been studied using neutron-diffraction and neutron-inelastic-scattering techniques. In two separate experiments the transformation was observed on cooling near 32 K. Measurements of the diffuse scattering, diffraction linewidths, quasielastic scattering, and the temperature dependence of the SIGMA4[hh0] phonon energies above the transformation show no evidence of transformation precursors. The sodium martensite appears as 24 rhombohedral variants, four about each bcc (110), with reflections from their basal planes at (1.0 1 8, 0.92, +/-0.06), (0.92, 1.018, +/-0.06), and equivalent points. The layer stacking order of the variants is fixed by their relationship to the host bcc material. The crystallography of the low-temperature phase is shown to be a complex mixture of stacking-fault-affected rhombohedral polytypes of a particular "almost-hexagonal" structure. These form a ladder of structures connected, one to another, by stacking faults. As the martensite is warmed and before the complete reversion to a bcc structure, the relative fraction of the different martensite phases changes. Near 55 K, the longest-period polytypes are the most stable. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. NIST,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899. RP BERLINER, R (reprint author), UNIV MISSOURI,COLUMBIA,MO 65211, USA. NR 39 TC 25 Z9 25 U1 1 U2 7 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 14436 EP 14447 DI 10.1103/PhysRevB.46.14436 PG 12 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500010 ER PT J AU CLEM, JR COFFEY, MW AF CLEM, JR COFFEY, MW TI VORTEX DYNAMICS IN A TYPE-II SUPERCONDUCTING FILM AND COMPLEX LINEAR-RESPONSE FUNCTIONS SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-FIELD; FLUX LINES; ORDER PARAMETER; ELASTIC ENERGY; TEMPERATURE; DISSIPATION; INDUCTIONS; LATTICE; STATE; MODEL AB The dynamics of interacting vortices in a type-II superconducting film responding to a distribution of currents parallel to the film is investigated. The nonlocality of vortex interactions is taken into account by use of an expansion in normal modes of the flux-line lattice and a wave-vector-dependent dynamical matrix. The theory is applied to obtain linear response functions including the complex mutual inductance and film impedance. For a particular geometry of driving current and pickup coil, the complex mutual inductance is calculated and it is shown that only longitudinal modes contribute to the measurable change in flux when pinning is absent or when it is represented as a linear restoring force acting the same way on each vortex. The configuration so described provides a sensitive means of studying vortex dynamics. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CLEM, JR (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 42 TC 56 Z9 56 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 1 PY 1992 VL 46 IS 22 BP 14662 EP 14674 DI 10.1103/PhysRevB.46.14662 PG 13 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500037 ER PT J AU FEDRO, AJ ZHOU, Y LEUNG, TC HARMON, BN SINHA, SK AF FEDRO, AJ ZHOU, Y LEUNG, TC HARMON, BN SINHA, SK TI EXACT PROJECTION-OPERATOR FORMALISM FOR HIGHLY CORRELATED SYSTEMS - MEAN-FIELD RESULTS FOR THE CUO2 LATTICE SO PHYSICAL REVIEW B LA English DT Article ID 2-DIMENSIONAL HUBBARD-MODEL; QUASI-PARTICLE BANDS; SUPERCONDUCTIVITY; PARAMETERS; DENSITY; STATES AB We present an exact formulation of the single-particle Green's functions for the two-dimensional three-band Hubbard model of the CuO2 lattice based on a projection-operator formalism of Mori. The model is general and incorporates the various known local-density-approximation (LDA) interaction parameters. In this paper we present only the mean-field results. The inclusion of self-energy effects will be presented elsewhere. Already, in the mean-field approximation, we find that properties such as hole occupations and magnetic moments compare remarkably well with those from quantum Monte Carlo (MC) calculations. The densities of states are also calculated for various hole dopings, again using the parameters from the LDA calculations. Finally the detailed effect of hopping between different O p orbitals, are also presented. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. EXXON RES & ENGN CO,CORP RES,ANNANDALE,NJ 08801. RP FEDRO, AJ (reprint author), NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115, USA. NR 24 TC 21 Z9 21 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 22 BP 14785 EP 14793 DI 10.1103/PhysRevB.46.14785 PG 9 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500046 ER PT J AU MONTHOUX, P BALATSKY, AV PINES, D AF MONTHOUX, P BALATSKY, AV PINES, D TI WEAK-COUPLING THEORY OF HIGH-TEMPERATURE SUPERCONDUCTIVITY IN THE ANTIFERROMAGNETICALLY CORRELATED COPPER OXIDES SO PHYSICAL REVIEW B LA English DT Article ID SPIN-LATTICE RELAXATION; PENETRATION DEPTH; TC; YBA2CU3O7-DELTA; STATE; DEPENDENCE; FIELD AB We show that the retarded interaction between quasiparticles on a two dimensional square lattice induced by the exchange of antiferromagnetic paramagnons leads uniquely to a transition to a superconducting state with d(x2-y2) symmetry. We find that the effective quasiparticle interaction responsible for superconductivity possesses considerable structure in both momentum and frequency space, and show, by explicit calculations, that if one wishes to obtain quantitatively meaningful results it is essential to allow for that structure in solving the full integral equations that determine the superconducting transition temperature and the superconducting properties. With a spin-excitation spectrum and a quasiparticle-paramagnon coupling determined by fits to normal-state experiments, we obtain high transition temperatures and energy-gap behaviors comparable to those measured for YBa2CU307, YBa2Cu3O6.63, and La1.85Sr0.15CuO4. C1 LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. LD LANDAU THEORET PHYS INST,MOSCOW,USSR. RP MONTHOUX, P (reprint author), UNIV ILLINOIS,DEPT PHYS,1110 W GREEN ST,URBANA,IL 61801, USA. NR 27 TC 336 Z9 337 U1 1 U2 12 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 14803 EP 14817 DI 10.1103/PhysRevB.46.14803 PG 15 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500048 ER PT J AU KRESIN, VZ AF KRESIN, VZ TI COUPLING STRENGTH IN SUPERCONDUCTING FULLERENES SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-TEMPERATURE; STATE AB The coupling strength lambda and the characteristic phonon frequency [OMEGA2]1/2 in superconducting fullerenes can be determined based on general expressions for T(c) and on the isotope effect and NMR experimental data. An analysis of recent data shows that the superconducting state of doped fullerenes A3C60 is caused by strong electron-vibrational coupling with lambda1 = 2.1 for A = Rb and lambda2 = 1. 5 for A = K, and [OMEGA2)1/2 congruent-to 250 cm-1. RP KRESIN, VZ (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 24 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 22 BP 14883 EP 14885 DI 10.1103/PhysRevB.46.14883 PG 3 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500058 ER PT J AU KATSUMATA, K SHAPIRO, SM MATSUDA, M SHIRANE, G TUCHENDLER, J AF KATSUMATA, K SHAPIRO, SM MATSUDA, M SHIRANE, G TUCHENDLER, J TI SIMULTANEOUS ORDERING OF ORTHOGONAL SPIN COMPONENTS IN A RANDOM MAGNET WITH COMPETING ANISOTROPIES SO PHYSICAL REVIEW B LA English DT Note ID QUENCHED RANDOM ALLOYS; DIFFERENT EASY AXES; ANTI-FERROMAGNETS; RANDOM MIXTURE; PHASE-TRANSITIONS; FE1-XCOXCL2; DIAGRAM; POINTS AB An elastic neutron-scattering experiment on the random magnet with competing spin anisotropies Fe0.75Co0.25Br2 clearly shows that the ordering of the spin component parallel to the crystalline c axis induces an ordering of the spin component perpendicular to it. The origin of this simultaneous ordering of the orthogonal spin components comes from a nondiagonal exchange interaction between spins. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV PARIS VI,DISPOSITIFS INFRAROUGE LAB,F-75252 PARIS,FRANCE. RP KATSUMATA, K (reprint author), INST PHYS & CHEM RES,WAKO,SAITAMA 35101,JAPAN. RI Matsuda, Masaaki/A-6902-2016 OI Matsuda, Masaaki/0000-0003-2209-9526 NR 20 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 22 BP 14906 EP 14908 DI 10.1103/PhysRevB.46.14906 PG 3 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500065 ER PT J AU NAVARRO, R CAMPBELL, LJ AF NAVARRO, R CAMPBELL, LJ TI COMMENT ON MAGNETIC-FLUX PROFILES OF HIGH-TC SUPERCONDUCTING GRANULES - 3-DIMENSIONAL CRITICAL-STATE-MODEL APPROXIMATION - REPLY SO PHYSICAL REVIEW B LA English DT Letter AB The comment by Bhagwat and Chaddah raises concerns about numerically determining field-free regions in type-II superconductors, the use of Bean's model in three dimensions, and asymptotic limits of the saturation magnetization in oblate and prolate spheroids. These concerns are answered. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. NR 2 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 1 PY 1992 VL 46 IS 22 BP 14927 EP 14927 DI 10.1103/PhysRevB.46.14927 PG 1 WC Physics, Condensed Matter SC Physics GA KB635 UT WOS:A1992KB63500072 ER PT J AU SALVISBERG, P BACKENSTOSS, G KRAUSE, H POWERS, RJ STEINACHER, M WEYER, HJ WILDI, M HOFFART, A RZEHORZ, B ULLRICH, H BOSNAR, D FURIC, M PETKOVIC, T SIMICEVIC, N ZMESKAL, H JANETT, A SHERMAN, RH AF SALVISBERG, P BACKENSTOSS, G KRAUSE, H POWERS, RJ STEINACHER, M WEYER, HJ WILDI, M HOFFART, A RZEHORZ, B ULLRICH, H BOSNAR, D FURIC, M PETKOVIC, T SIMICEVIC, N ZMESKAL, H JANETT, A SHERMAN, RH TI PION ABSORPTION IN TRITIUM AT INTERMEDIATE ENERGIES SO PHYSICAL REVIEW C LA English DT Article ID DIFFERENTIAL CROSS-SECTION; ELASTIC-SCATTERING; CHARGE-SYMMETRY; HE-3; PI+; NUCLEI; MECHANISM; FLIGHT AB The angular distribution of nucleons from a kinematically complete measurement of pions absorbed in H-3 on nucleon pairs with isospin T = 0 and T = 1 at incident pion energies of 119, 206, and 300 MeV are presented. The T = 0 data are quite similar to pion absorption data in deuterium. The integrated absorption cross sections scale within errors with the number of isoscaler neutron-proton pairs. The T = 1 cross sections, which correspond to absorption on dineutrons, are an order of magnitude smaller. The angular distributions for isovector absorption show a significant asymmetry, indicating interference effects between amplitudes with or without DELTA isobars in the intermediate states. The existence of a significant three-nucleon absorption component is established. The integrated absorption cross sections for processes involving two and three nucleons were determined. The neutron and proton momentum probability densities in H-3 were determined from the spectator recoil resulting from quasifree two-nucleon pion absorption. C1 UNIV BASEL,INST PHYS,CH-4051 BASEL,SWITZERLAND. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE,GERMANY. UNIV ZAGREB,FAC SCI,YU-41001 ZAGREB,YUGOSLAVIA. UNIV ZAGREB,FAC DERMATOL,YU-41001 ZAGREB,YUGOSLAVIA. AUSTRIAN ACAD SCI,INST MITTELENERGIE PHYS,A-1010 VIENNA,AUSTRIA. PAUL SCHERRER INST,VILLIGEN,SWITZERLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NR 55 TC 13 Z9 13 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2172 EP 2198 DI 10.1103/PhysRevC.46.2172 PG 27 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800009 ER PT J AU RAMAN, S CAMPBELL, JL PRINDLE, A GUNNINK, R PALATHINGAL, JC AF RAMAN, S CAMPBELL, JL PRINDLE, A GUNNINK, R PALATHINGAL, JC TI UNSUITABILITY OF TB-157 FOR LIGHT-NEUTRINO REST-MASS STUDIES SO PHYSICAL REVIEW C LA English DT Article ID FLUORESCENCE YIELDS; COSTER-KRONIG; ELECTRON-CAPTURE; SPECTRA; DECAY AB We have measured accurately the intensity ratio of L and K x rays in the Tb-157 --> Gd-157 electron-capture decay as 0.932+/-0.015. From this ratio, we have deduced a value of 4.0+/-0.2 for the electron-capture ratio P(L)/P(K), leading, in turn, to a decay energy of 60.0+/-0.3 keV. This Q value is 2.9 keV lower than the currently accepted value. This decay energy rules out L capture to the daughter excited state at 54.54 keV; therefore, Th-157 is not a suitable candidate for light-neutrino rest-mass studies based on this L-capture branch. C1 UNIV GUELPH,GUELPH WATERLOO PROGRAM GRAD WORK PHYS,GUELPH N1G 2W1,ONTARIO,CANADA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV PUERTO RICO,DEPT PHYS,MAYAGUEZ,PR 00708. RP RAMAN, S (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 23 TC 6 Z9 6 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2241 EP 2245 DI 10.1103/PhysRevC.46.2241 PG 5 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800014 ER PT J AU AUFDERHEIDE, MB BLOOM, SD RESLER, DA GOODMAN, CD AF AUFDERHEIDE, MB BLOOM, SD RESLER, DA GOODMAN, CD TI GAMOW-TELLER STRENGTH IN A = 37 NUCLEI SO PHYSICAL REVIEW C LA English DT Article ID SD-SHELL NUCLEI; CL-37 AB A comparison is made of the recent beta+-decay measurements of Garcia et al. and the 1981 (Cl(p,n)Ar)-Cl-37-Ar-37 measurements of Rapaport et al. in order to see whether the experiments are consistent. Garcia et al. were not able to determine the amount of Gamow-Teller strength in the isobaric analog state (IAS) or the Coulomb mixing of Fermi strength to a state near the IAS, and were forced to determine the amount of Gamow-Teller strength in the daughter 1371 keV state by making the branching ratios sum to unity. This approach leaves a range of possible values open for these quantities which we investigate. We find that the experiments could be consistent within a theoretically unlikely part of this range. We also examine the effect of this range of allowed values on solar and supernova neutrino cross sections of C-37 and find weak dependence on the uncertainties described here. We discuss how the consistency of the two experiments can be tested more conclusively. C1 INDIANA UNIV,BLOOMINGTON,IN 47401. RP AUFDERHEIDE, MB (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 21 TC 6 Z9 6 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2251 EP 2258 DI 10.1103/PhysRevC.46.2251 PG 8 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800016 ER PT J AU CHOU, WT CASTEN, RF ZAMFIR, NV AF CHOU, WT CASTEN, RF ZAMFIR, NV TI AVERAGE RESONANCE CAPTURE STUDY OF TE-126 SO PHYSICAL REVIEW C LA English DT Article ID INTERACTING-BOSON MODEL; MIXED-SYMMETRY STATES; INTRUDER STATES; TELLURIUM ISOTOPES; NEUTRON-CAPTURE; NUCLEI; TRANSITIONS; EXCITATIONS; CD-114; DECAY AB An average resonance capture study of Te-126 was carried out with 2- and 24-keV neutron beams. The experiments provide a complete set of 0+, 1+, and 2+ levels and are in agreement with previous data. The completeness of these levels of Te-126, along with an earlier study of Te-124, permits a discussion of the structure of the Te isotopes in terms of U(5) and O(6) symmetries, and an investigation of the possible presence of intruder configurations. C1 CLARK UNIV,WORCESTER,MA 01610. INST ATOM PHYS,BUCHAREST,ROMANIA. RP CHOU, WT (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 34 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2283 EP 2288 DI 10.1103/PhysRevC.46.2283 PG 6 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800020 ER PT J AU FRIAR, JL FALLIEROS, S AF FRIAR, JL FALLIEROS, S TI GAUGE-INVARIANCE AND THE NONRELATIVISTIC WARD-TAKAHASHI IDENTITY SO PHYSICAL REVIEW C LA English DT Article ID LOW-ENERGY THEOREMS; PION-PHOTOPRODUCTION; COMPTON AMPLITUDE AB A simple derivation is given of the nonrelativistic Ward-Takahashi identity, which has been used in nearly every derivation of low-energy theorems for electromagnetic processes in nuclei. The low-energy theorem for Compton scattering is derived without assuming that identity. It is shown that gauge invariance alone leads to the correct form for the Compton amplitude, except that the magnetic recoil term does not have its conventional form. Use of Siegert's theorem, however, leads to that form. C1 UNIV MAINZ,INST KERNPHYS,W-6500 MAINZ,GERMANY. BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. RP FRIAR, JL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 11 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2393 EP 2395 DI 10.1103/PhysRevC.46.2393 PG 3 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800035 ER PT J AU KHAYAT, MG CHANT, NS ROOS, PG LEE, TSH AF KHAYAT, MG CHANT, NS ROOS, PG LEE, TSH TI PION ABSORPTION ON POLARIZED NUCLEAR TARGETS SO PHYSICAL REVIEW C LA English DT Article ID ANALYZING POWER IT11; ELASTIC-SCATTERING; RESONANCE; ENERGY; HE-3; DEPENDENCE; REGION; C-13 AB The availability of polarized nuclear targets for nuclear reaction studies offers new research directions. In this paper we present the distorted wave impulse approximation formalism and calculations for two-nucleon pion absorption on polarized nuclear targets. We assume that the pion absorbs on a S-3(1) n-p pair and use phenomenological amplitudes to describe the piNN vertex. The effects of the distortions on the incoming pion and outgoing protons, in contrast to the elementary piNN vertex, are delineated for certain special caws in which the formalism simplifies. Predictions of cross sections and vector and tensor analyzing powers are made for polarized target nuclei Li-6, Li-7, C-13, and N-14 at pion incident energies of 115,165, and 255 MeV. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP KHAYAT, MG (reprint author), UNIV MARYLAND,DEPT PHYS,COLL PK,MD 20742, USA. NR 31 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2415 EP 2429 DI 10.1103/PhysRevC.46.2415 PG 15 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800038 ER PT J AU BOSTED, PE LUNG, A ANDIVAHIS, L STUART, LM ALSTER, J ARNOLD, RG CHANG, CC DIETRICH, FS DODGE, W GEARHART, R GOMEZ, J GRIFFIOEN, KA HICKS, RS HYDEWRIGHT, CE KEPPEL, C KUHN, SE LICHTENSTADT, J MISKIMEN, RA PETERSON, GA PETRATOS, GG ROCK, SE ROKNI, S SAKUMOTO, WK SPENGOS, M SWARTZ, K SZALATA, Z TAO, LH AF BOSTED, PE LUNG, A ANDIVAHIS, L STUART, LM ALSTER, J ARNOLD, RG CHANG, CC DIETRICH, FS DODGE, W GEARHART, R GOMEZ, J GRIFFIOEN, KA HICKS, RS HYDEWRIGHT, CE KEPPEL, C KUHN, SE LICHTENSTADT, J MISKIMEN, RA PETERSON, GA PETRATOS, GG ROCK, SE ROKNI, S SAKUMOTO, WK SPENGOS, M SWARTZ, K SZALATA, Z TAO, LH TI MEASUREMENTS OF NU-W2 AND R=SIGMA-L/SIGMA-T FROM INELASTIC ELECTRON-ALUMINUM SCATTERING NEAR X=1 SO PHYSICAL REVIEW C LA English DT Article ID CROSS-SECTIONS; NUCLEON; DYNAMICS; ENERGIES; NEUTRON AB Cross sections for inclusive electron scattering from aluminum have been measured at both forward and backward angles in the kinematic region near x = 1 and 1.75 < Q2 < 7 (GeV/c)2. The forward-angle data are in good agreement with a recent calculation. Both the data and the calculation show scaling behavior for F2(xi,Q2) = nuW2(xi,Q2) at high Q2 for fixed values of the Nachtmann variable xi. The ratio R = sigma(L)/sigma(T) has been extracted for 1.75 < Q2 < 5 (GeV/c)2 and is found to decrease with Q2 to a value consistent with zero at the highest Q2. C1 UNIV MASSACHUSETTS, AMHERST, MA 01003 USA. NIST, GAITHERSBURG, MD 20899 USA. UNIV PENN, PHILADELPHIA, PA 19104 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. UNIV CALIF DAVIS, DAVIS, CA 95616 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. UNIV MARYLAND, COLL PK, MD 20742 USA. STANFORD UNIV, STANFORD, CA 94305 USA. STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94309 USA. TEL AVIV UNIV, IL-69978 TEL AVIV, ISRAEL. RP AMERICAN UNIV, WASHINGTON, DC 20016 USA. NR 33 TC 16 Z9 16 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9985 EI 2469-9993 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2505 EP 2515 DI 10.1103/PhysRevC.46.2505 PG 11 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800045 ER PT J AU KOETKE, DD FISK, R KOETKE, DS MANWEILER, R BOWLES, TJ BROWN, A BROWN, RE BURMAN, RL CLARK, DA CLEARWATER, S DOMBECK, T KRUSE, H LEE, D AAS, B IGO, G NEWSOM, C BEAVIS, D FUNG, SY GORN, W POE, RT VANDALEN, GJ BASSALLECK, B DIETERLE, B GREGORY, C HILL, RE KANG, JH LEAVITT, C AUERBACH, L DATTA, S HUANG, Y AF KOETKE, DD FISK, R KOETKE, DS MANWEILER, R BOWLES, TJ BROWN, A BROWN, RE BURMAN, RL CLARK, DA CLEARWATER, S DOMBECK, T KRUSE, H LEE, D AAS, B IGO, G NEWSOM, C BEAVIS, D FUNG, SY GORN, W POE, RT VANDALEN, GJ BASSALLECK, B DIETERLE, B GREGORY, C HILL, RE KANG, JH LEAVITT, C AUERBACH, L DATTA, S HUANG, Y TI MUON-NEUTRINO CARBON CHARGED-CURRENT INTERACTION NEAR THE MUON THRESHOLD SO PHYSICAL REVIEW C LA English DT Article ID CROSS-SECTIONS; CAPTURE RATES; SCATTERING; PROTONS; NUCLEI; ENERGY; PIONS; C-12 AB A measurement of the muon-neutrino carbon charged-current cross section, C-12(nu(mu),mu-)X, was performed using the in-flight pion-decay neutrino source at the LAMPF accelerator. At an average interacting neutrino energy of 202 MeV an inclusive cross section of (15.9+/-2.6+/-3.7) X 10(-39) cm2 Was measured. This value is in best agreement with the Fermi-gas model and is in disagreement with a previous experiment and subsequent calculations that yielded substantially lower cross sections. However, the muon energy spectrum shows a marked depletion of events at high energies compared to the Fermigas model. From a small sample of events in which the final-state nucleus was in the ground state of N-12, a cross section for the reaction C-12(nu(mu),mu-)N-12(g.s.) of (1.7+/-0.8+/-0.3) X 10(-39) CM2 or about 11+/-5 % of the total event rate was obtained. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV CALIF RIVERSIDE, RIVERSIDE, CA 92521 USA. UNIV IOWA HOSP & CLIN, IOWA CITY, IA 52242 USA. UNIV NEW MEXICO, ALBUQUERQUE, NM 87131 USA. TEMPLE UNIV, PHILADELPHIA, PA 19122 USA. RP KOETKE, DD (reprint author), VALPARAISO UNIV, VALPARAISO, IN 46383 USA. NR 38 TC 16 Z9 16 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2554 EP 2566 DI 10.1103/PhysRevC.46.2554 PG 13 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800050 ER PT J AU AUERBACH, N BOWMAN, JD AF AUERBACH, N BOWMAN, JD TI DOORWAY STATE APPROXIMATION AND SIGN CORRELATIONS IN PARITY NONCONSERVATION IN COMPOUND NEUTRON RESONANCES SO PHYSICAL REVIEW C LA English DT Article ID ISOVECTOR GIANT-RESONANCES; NUCLEI AB The nonzero average parity-nonconserving longitudinal analyzing powers for p-wave neutron resonances in compound nuclear systems are analyzed within the giant J=0- resonance doorway model. Assuming that the parity-nonconservation interaction can be approximated by a one-body operator of the type sigma.p, we find that the observed fixed sign of the asymmetry arises naturally within the doorway model. The J=0- giant resonance does not enhance the size of the constant asymmetry. The model prediction for the average symmetry is shown to be similar to that obtained in the single-particle model. In particular, if one retains only the first-order contribution to the analyzing power, a very large single-particle matrix element [4p1/2\V(pv)\5s1/2] congruent-to 75+/-50 eV is needed to reproduce the observed average asymmetry. This large value is in contradiction with the value of 2 eV estimated from the experimentally measured spreading width of the parity-violating interaction using the doorway model. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP AUERBACH, N (reprint author), MICHIGAN STATE UNIV,NATL SUPERCOND CYCLOTRON LAB,E LANSING,MI 48824, USA. NR 16 TC 31 Z9 31 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2582 EP 2586 DI 10.1103/PhysRevC.46.2582 PG 5 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800052 ER PT J AU MOODY, KJ LOUGHEED, RW HULET, EK AF MOODY, KJ LOUGHEED, RW HULET, EK TI SEARCH FOR THE DOUBLE BETA-DECAY OF PU-244 SO PHYSICAL REVIEW C LA English DT Article ID MAJORON EMISSION; MO-100; SUPPRESSION; TE-128; RATES; LIMIT; SE-82; 2-NU AB We have searched for the ingrowth of Cm-244 in a 1.45-g sample of Pu-244. We isolated a curium fraction after an ingrowth period of 1.03 yr; during this time the Pu-244 sample produced less-than-or-equal-to 0.24 alpha disintegrations per day of Cm-244 (95% C.L.), corresponding to a half-life for the double beta decay of Pu-244 of greater-than-or-equal-to 1.1 X 10(18) yr. RP MOODY, KJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,DIV NUCL CHEM,LIVERMORE,CA 94551, USA. NR 44 TC 14 Z9 14 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2624 EP 2627 DI 10.1103/PhysRevC.46.2624 PG 4 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800057 ER PT J AU BENESH, CJ AF BENESH, CJ TI QUADRUPOLE CONTRIBUTION TO 2-NEUTRON REMOVAL IN HEAVY-ION COLLISIONS SO PHYSICAL REVIEW C LA English DT Article ID NUCLEUS-NUCLEUS COLLISIONS; ELECTROMAGNETIC DISSOCIATION; AU-197 TARGETS; EMISSION; EXCITATIONS; ENERGIES; CO-59; Y-89 AB In this paper, electric quadrupole corrections to the two-neutron removal cross section measured in heavy ion collisions are estimated for Au-197 and Co-59 targets. The quadrupole process is assumed to proceed primarily through excitation of the giant isovector quadrupole resonance, which then decays by neutron emission. For Co-59, the contribution from E2 radiation is found to be small, While for Au-197 we find the quadrupole contribution resolves the discrepancy between experiment and the simple predictions of the Weissacker-Williams virtual photon method. RP BENESH, CJ (reprint author), LOS ALAMOS NATL LAB,T-5,MS B283,LOS ALAMOS,NM 87545, USA. NR 22 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP 2635 EP 2637 DI 10.1103/PhysRevC.46.2635 PG 3 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800060 ER PT J AU LIANG, Y CARPENTER, MP JANSSENS, RVF AHMAD, I HENRY, RG KHOO, TL LAURITSEN, T SORAMEL, F PILOTTE, S LEWIS, JM RIEDINGER, LL YU, CH GARG, U REVIOL, W BEARDEN, IG AF LIANG, Y CARPENTER, MP JANSSENS, RVF AHMAD, I HENRY, RG KHOO, TL LAURITSEN, T SORAMEL, F PILOTTE, S LEWIS, JM RIEDINGER, LL YU, CH GARG, U REVIOL, W BEARDEN, IG TI DOUBLE BLOCKING IN THE SUPERDEFORMED TL-192 NUCLEUS SO PHYSICAL REVIEW C LA English DT Note ID BANDS; ALIGNMENT; STATES AB Six superdeformed bands have been found in the nucleus Tl-192. For two of the bands, the dynamic moment of inertia J(2) is found to be constant with the rotational frequency homegaBAR. This result can be understood in terms of Pauli blocking of quasiparticle alignments in intruder orbitals, and represents strong experimental evidence that the alignment of these intruders is responsible for the smooth rise in J(2) seen in other superdeformed nuclei of this mass region. C1 UNIV TENNESSEE,KNOXVILLE,TN 37831. UNIV OTTAWA,OTTAWA K1N 6N5,ONTARIO,CANADA. UNIV NOTRE DAME,NOTRE DAME,IN 46556. PURDUE UNIV,W LAFAYETTE,IN 47907. RP LIANG, Y (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Bearden, Ian/M-4504-2014; Carpenter, Michael/E-4287-2015 OI Bearden, Ian/0000-0003-2784-3094; Carpenter, Michael/0000-0002-3237-5734 NR 22 TC 33 Z9 33 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD DEC PY 1992 VL 46 IS 6 BP R2136 EP R2139 PG 4 WC Physics, Nuclear SC Physics GA KE698 UT WOS:A1992KE69800003 ER PT J AU ANTONIAZZI, L ARENTON, M CAO, Z CHEN, T CONETTI, S COX, B DELCHAMPS, S FORTNEY, L GUFFEY, K HAIRE, M IOANNOU, P JENKINS, CM JUDD, DJ KOURKOUMELIS, C MANOUSAKISKATSIKAKIS, A KUZMINSKI, J LECOMPTE, T MARCHIONNI, A HE, M MAZUR, PO MURPHY, CT PRAMANTIOTIS, P RAMEIKA, R RESVANIS, LK ROSATI, M ROSEN, J SHEN, C SHEN, Q SIMARD, A SMITH, RP SPIEGEL, L STAIRS, DG TAN, Y TESAREK, RJ TURKINGTON, T TURNBULL, L TURKOT, F TZAMARIAS, S VOULGARIS, G WAGONER, DE WANG, C YANG, W YAO, N ZHANG, N ZHANG, X ZIOULAS, G ZOU, B AF ANTONIAZZI, L ARENTON, M CAO, Z CHEN, T CONETTI, S COX, B DELCHAMPS, S FORTNEY, L GUFFEY, K HAIRE, M IOANNOU, P JENKINS, CM JUDD, DJ KOURKOUMELIS, C MANOUSAKISKATSIKAKIS, A KUZMINSKI, J LECOMPTE, T MARCHIONNI, A HE, M MAZUR, PO MURPHY, CT PRAMANTIOTIS, P RAMEIKA, R RESVANIS, LK ROSATI, M ROSEN, J SHEN, C SHEN, Q SIMARD, A SMITH, RP SPIEGEL, L STAIRS, DG TAN, Y TESAREK, RJ TURKINGTON, T TURNBULL, L TURKOT, F TZAMARIAS, S VOULGARIS, G WAGONER, DE WANG, C YANG, W YAO, N ZHANG, N ZHANG, X ZIOULAS, G ZOU, B TI MEASUREMENT OF J/PSI AND PSI' PRODUCTION IN 300-GEV/C PROTON, ANTIPROTON, AND PI+/- INTERACTIONS WITH NUCLEI SO PHYSICAL REVIEW D LA English DT Article ID 225-GEV-C P+/-,K+,P+/-BEAMS; 125-GEV/C ANTIPROTON; PI(-) INTERACTIONS; MUON PAIRS; SN TARGETS; 225-GEV/CPI+/; PSI'(3.7); BEAMS AB Hadroproduction of the J/psi and psi' states has been studied in 300-GeV/c proton, antiproton, and pi+-Li interactions. Both total and differential cross sections in x(F) and p(T) have been measured for the J/psi for the pi+-, proton, and antiproton interactions. The ratio of psi' to J/psi production has been determined for the four types of beam particles. C1 NANJING UNIV,NANJING,PEOPLES R CHINA. DUKE UNIV,DURHAM,NC 27706. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. MCGILL UNIV,MONTREAL H3A 2T8,QUEBEC,CANADA. PRAIRIE VIEW A&M UNIV,PRAIRIE VIEW,TX 77445. NORTHWESTERN UNIV,EVANSTON,IL 60208. SHANDONG UNIV,JINAN,PEOPLES R CHINA. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22901. RP ANTONIAZZI, L (reprint author), UNIV ATHENS,ATHENS,GREECE. NR 19 TC 65 Z9 65 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1992 VL 46 IS 11 BP 4828 EP 4835 DI 10.1103/PhysRevD.46.4828 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB320 UT WOS:A1992KB32000008 ER PT J AU AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BALDINI, A BARBARINO, GC BARISH, BC BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, D CAMPANA, P CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CHIERA, C COBIS, A CORMACK, R CORONA, A COUTU, S DECATALDO, G DEKHUSSI, H DEMARZO, C DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FOTI, L FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GIUBELLINO, P GRASSI, M GREEN, P GRILLO, A GUARINO, F GUSTAVINO, C HABIG, A HEINZ, R HONG, JT IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEE, C LEVIN, DS LIPARI, P LIU, G LIU, R LONGO, MJ LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D CHIESA, AM MASERA, M MATTEUZZI, P MICHAEL, DG MILLER, L MONACELLI, P MONTENO, M MUFSON, S MUSSER, J NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAZZI, R PECK, CW PETRAKIS, J PETRERA, S PIGNATANO, ND PISTILLI, P PREDIERI, F RAMELLO, L REYNOLDSON, J RONGA, F ROSA, G SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, JL SULAK, LR SURDO, A TARLE, G TOGO, V VALENTE, V WALTER, CW WEBB, R WORSTELL, W AF AHLEN, S AMBROSIO, M ANTOLINI, R AURIEMMA, G BALDINI, A BARBARINO, GC BARISH, BC BATTISTONI, G BELLOTTI, R BEMPORAD, C BERNARDINI, P BILOKON, H BISI, V BLOISE, C BUSSINO, S CAFAGNA, F CALICCHIO, M CAMPANA, D CAMPANA, P CARBONI, M CECCHINI, S CEI, F CHIARELLA, V CHIERA, C COBIS, A CORMACK, R CORONA, A COUTU, S DECATALDO, G DEKHUSSI, H DEMARZO, C DEVINCENZI, M DICREDICO, A DIEHL, E ERRIQUEZ, O FAVUZZI, C FICENEC, D FORTI, C FOTI, L FUSCO, P GIACOMELLI, G GIANNINI, G GIGLIETTO, N GIUBELLINO, P GRASSI, M GREEN, P GRILLO, A GUARINO, F GUSTAVINO, C HABIG, A HEINZ, R HONG, JT IAROCCI, E KATSAVOUNIDIS, E KEARNS, E KLEIN, S KYRIAZOPOULOU, S LAMANNA, E LANE, C LEE, C LEVIN, DS LIPARI, P LIU, G LIU, R LONGO, MJ LUDLAM, G MANCARELLA, G MANDRIOLI, G MARGIOTTANERI, A MARIN, A MARINI, A MARTELLO, D CHIESA, AM MASERA, M MATTEUZZI, P MICHAEL, DG MILLER, L MONACELLI, P MONTENO, M MUFSON, S MUSSER, J NUTTER, S OKADA, C OSTERIA, G PALAMARA, O PARLATI, S PATERA, V PATRIZII, L PAZZI, R PECK, CW PETRAKIS, J PETRERA, S PIGNATANO, ND PISTILLI, P PREDIERI, F RAMELLO, L REYNOLDSON, J RONGA, F ROSA, G SATRIANO, C SATTA, L SCAPPARONE, E SCHOLBERG, K SCIUBBA, A LUGARESI, PS SEVERI, M SITTA, M SPINELLI, P SPINETTI, M SPURIO, M STEELE, J STEINBERG, R STONE, JL SULAK, LR SURDO, A TARLE, G TOGO, V VALENTE, V WALTER, CW WEBB, R WORSTELL, W TI MEASUREMENT OF THE DECOHERENCE FUNCTION WITH THE MACRO DETECTOR AT GRAN-SASSO SO PHYSICAL REVIEW D LA English DT Article ID MULTIPLICITY DISTRIBUTIONS; MUON BUNDLES; COSMIC-RAYS; ENERGIES AB A measurement of the underground muon decoherence function has been performed using the multiple muon events collected by the MACRO detector at the Gran Sasso National Laboratory. A detector-independent analysis is presented for different zenith regions and rock depths; this allows direct comparison with any model of hadronic interactions. The measured decoherence function is compared with the predictions of a Monte Carlo simulation based on data taken by recent collider experiments. C1 UNIV BARI,DIPARTIMENTO FIS,I-70126 BARI,ITALY. CALTECH,PASADENA,CA 91125. DREXEL UNIV,DEPT PHYS,PHILADELPHIA,PA 19104. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. UNIV LAQUILA,DIPARTIMENTO FIS,I-67100 LAQUILA,ITALY. UNIV LECCE,DIPARTIMENTO FIS,I-73100 LECCE,ITALY. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. NAPLES UNIV,DIPARTIMENTO FIS,I-80125 NAPLES,ITALY. UNIV TURIN,DIPARTIMENTO FIS,I-10125 TURIN,ITALY. UNIV PISA,DIPARTIMENTO FIS,I-56010 PISA,ITALY. IST TESRE,CNR,BOLOGNA,ITALY. TEXAS A&M UNIV SYST,DEPT PHYS,COLL STN,TX 77843. UNIV TRIESTE,I-34127 TRIESTE,ITALY. INFN,I-34100 TRIESTE,ITALY. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. UNIV ROME,DIPARTIMENTO ENERGET,I-00185 ROME,ITALY. UNIV BASILICATA,I-85100 POTENZA,ITALY. IST NAZL FIS NUCL,I-70126 BARI,ITALY. IST NAZL FIS NUCL,I-40126 BOLOGNA,ITALY. INDIANA UNIV,DEPT ASTRON,BLOOMINGTON,IN 47405. IST NAZL FIS NUCL,LAB NAZL FRASCATI,I-00044 ROME,ITALY. IST NAZL FIS NUCL,LAB NAZL GRAN SASSO,I-67010 ASSERGI,ITALY. IST NAZL FIS NUCL,I-67100 LAQUILA,ITALY. IST NAZL FIS NUCL,I-73100 LECCE,ITALY. IST NAZL FIS NUCL,I-80125 NAPLES,ITALY. IST NAZL FIS NUCL,I-00185 ROME,ITALY. IST NAZL FIS NUCL,I-10125 TURIN,ITALY. UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19716. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP AHLEN, S (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. RI gustavino, carlo/K-4355-2015; Lamanna, Ernesto/C-7658-2012; Spurio, Maurizio/G-4170-2012; Barbarino, Giancarlo/L-2559-2015; Martello, Daniele/J-3131-2012; Cei, Fabrizio/M-8891-2016; Guarino, Fausto/I-3166-2012; giglietto, nicola/I-8951-2012; Masera, Massimo/J-4313-2012; Cafagna, Francesco/A-9299-2010; Ramello, Luciano/F-9357-2013 OI Masera, Massimo/0000-0003-1880-5467; Coutu, Stephane/0000-0003-2923-2246; Sciubba, Adalberto/0000-0002-3301-9176; Monteno, Marco/0000-0002-3521-6333; ERRIQUEZ, Onofrio/0000-0002-9784-6568; Bellotti, Roberto/0000-0003-3198-2708; gustavino, carlo/0000-0003-3232-7027; Carboni, Massimo/0000-0003-4296-3799; Petrera, Sergio/0000-0002-6029-1255; Lamanna, Ernesto/0000-0002-7844-8230; Barbarino, Giancarlo/0000-0001-9253-3397; Martello, Daniele/0000-0003-2046-3910; Cei, Fabrizio/0000-0002-8313-3540; Guarino, Fausto/0000-0003-1427-9885; Cormack, Robert/0000-0001-5553-9984; giglietto, nicola/0000-0002-9021-2888; Cafagna, Francesco/0000-0002-7450-4784; NR 19 TC 35 Z9 35 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1992 VL 46 IS 11 BP 4836 EP 4845 DI 10.1103/PhysRevD.46.4836 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB320 UT WOS:A1992KB32000009 ER PT J AU THRON, JL ALLISON, WWM ALNER, GJ AMBATS, I AYRES, DS BALKA, LJ BARR, GD BARRETT, WL BENJAMIN, D BORDER, PM BROOKS, CB COBB, JH COCKERILL, DJA COURANT, H DAWSON, JW DEMUTH, DM EDWARDS, VW EWEN, B FIELDS, TH GARCIAGARCIA, C GILES, RH GILLER, GL GOODMAN, MC GRAY, RN HEILIG, SJ HILL, N HOFTIEZER, JH JANKOWSKI, DJ JOHNS, K KAFKA, T KASAHARA, SMS KOCHOCKI, J LEESON, W LITCHFIELD, PJ LONGLEY, NP LOPEZ, FV LOWE, MJ MANN, WA MARSHAK, ML MAY, EN MAXAM, D MCMASTER, L MILBURN, RH MILLER, WH MINOR, CP NAPIER, A OLIVER, WP PEARCE, GF PERKINS, DH PETERSON, EA PRICE, LE ROBACK, DM ROSEN, DB RUDDICK, K SAITTA, B SCHMID, DJ SCHLERETH, J SCHNEPS, J SHIELD, PD SHUPE, MA SUNDARALINGAM, N THOMSON, MA TUPPER, LM VILLAUME, G WERKEMA, SJ WEST, N WOODS, CA AF THRON, JL ALLISON, WWM ALNER, GJ AMBATS, I AYRES, DS BALKA, LJ BARR, GD BARRETT, WL BENJAMIN, D BORDER, PM BROOKS, CB COBB, JH COCKERILL, DJA COURANT, H DAWSON, JW DEMUTH, DM EDWARDS, VW EWEN, B FIELDS, TH GARCIAGARCIA, C GILES, RH GILLER, GL GOODMAN, MC GRAY, RN HEILIG, SJ HILL, N HOFTIEZER, JH JANKOWSKI, DJ JOHNS, K KAFKA, T KASAHARA, SMS KOCHOCKI, J LEESON, W LITCHFIELD, PJ LONGLEY, NP LOPEZ, FV LOWE, MJ MANN, WA MARSHAK, ML MAY, EN MAXAM, D MCMASTER, L MILBURN, RH MILLER, WH MINOR, CP NAPIER, A OLIVER, WP PEARCE, GF PERKINS, DH PETERSON, EA PRICE, LE ROBACK, DM ROSEN, DB RUDDICK, K SAITTA, B SCHMID, DJ SCHLERETH, J SCHNEPS, J SHIELD, PD SHUPE, MA SUNDARALINGAM, N THOMSON, MA TUPPER, LM VILLAUME, G WERKEMA, SJ WEST, N WOODS, CA TI SEARCH FOR MAGNETIC MONOPOLES WITH THE SOUDAN-2 DETECTOR SO PHYSICAL REVIEW D LA English DT Article ID STOPPING-POWER; FLUX; PROTON; DECAY; COLLIDER; ARRAY; LIMIT AB A search for grand unified theory magnetic monopoles making highly ionizing tracks in argon gas has been conducted using the Soudan 2 nucleon decay detector. This underground detector is a large fine-grained tracking calorimeter comprised of long drift tubes read out by proportional wires. No monopole candidates were observed in data taken over almost three years, yielding an upper flux limit of 8.7 X 10(-15) cm-2s-1sr-1 for monopole velocities of beta > 2 x 10(-3). C1 UNIV MINNESOTA,MINNEAPOLIS,MN 55455. UNIV OXFORD,DEPT PHYS,OXFORD OX1 3RH,ENGLAND. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. TUFTS UNIV,MEDFORD,MA 02155. GRINNELL COLL,GRINNELL,IA 50112. CARLETON COLL,NORTHFIELD,MN 55057. WESTERN WASHINGTON STATE UNIV,BELLINGHAM,WA 98225. RP THRON, JL (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 26 TC 27 Z9 27 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1992 VL 46 IS 11 BP 4846 EP 4851 DI 10.1103/PhysRevD.46.4846 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB320 UT WOS:A1992KB32000010 ER PT J AU BARNES, T SWANSON, ES WEINSTEIN, J AF BARNES, T SWANSON, ES WEINSTEIN, J TI I = 3/2 K-PI SCATTERING IN THE NONRELATIVISTIC QUARK POTENTIAL MODEL SO PHYSICAL REVIEW D LA English DT Article ID SHORT-RANGE PART; BARYON-BARYON INTERACTION; NUCLEAR-PHYSICS; CLUSTER MODEL; 6 QUARKS; CHROMODYNAMICS AB We study I = 3/2 elastic Kpi scattering to Born order using nonrelativstic quark wave functions in a constituent-exchange model. This channel is ideal for the study of nonresonant meson-meson scattering amplitudes since s-channel resonances do not contribute significantly. Standard quark model parameters yield good agreement with the measured S- and P-wave phase shifts and with partial conservation of axial-vector current calculations of the scattering length. The P-wave phase shift is especially interesting because it is nonzero solely due to SU(3) f-symmetry-breaking effects, and is found to be in good agreement with experiment given conventional values for the strange and nonstrange constituent quark masses. C1 OAK RIDGE NATL LAB,CTR COMPUTATIONALLY INTENS PHYS,OAK RIDGE,TN 37831. MIT,CTR THEORET PHYS,NUCL SCI LAB,CAMBRIDGE,MA 02139. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. UNIV MISSISSIPPI,DEPT PHYS & ASTRON,UNIVERSITY,MS 38677. RP BARNES, T (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 40 TC 31 Z9 32 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1992 VL 46 IS 11 BP 4868 EP 4872 DI 10.1103/PhysRevD.46.4868 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB320 UT WOS:A1992KB32000013 ER PT J AU RIZZO, TG AF RIZZO, TG TI PHENOMENOLOGY OF R-PARITY BREAKING IN E6 MODELS SO PHYSICAL REVIEW D LA English DT Article ID SUPERSYMMETRIC THEORIES; QUANTUM BEAMSTRAHLUNG; VIOLATION AB We explore the phenomenology of new R-parity-violating operators that can occur in E6 models. The set of allowed operators is found to depend sensitively on the nature of the extension of the standard-model gauge group. These new interactions lead to additional production processes for the exotic particles in such models and allow the lightest supersymmetric partner (LSP) to decay but with a highly suppressed rate. The implications of these new interactions are examined for the Fermilab Tevatron, Superconducting Super Collider, Large Hadron Collider, the DESY ep collider HERA, and square-root s = 0.5 and 1 TeV e+e-colliders. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS, AMES, IA 50011 USA. RP ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, ARGONNE, IL 60439 USA. NR 30 TC 8 Z9 8 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1992 VL 46 IS 11 BP 5102 EP 5109 DI 10.1103/PhysRevD.46.5102 PG 8 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB320 UT WOS:A1992KB32000039 ER PT J AU CRATER, HW BECKER, RL WONG, CY VANALSTINE, P AF CRATER, HW BECKER, RL WONG, CY VANALSTINE, P TI NONPERTURBATIVE SOLUTION OF 2-BODY DIRAC EQUATIONS FOR QUANTUM ELECTRODYNAMICS AND RELATED FIELD-THEORIES SO PHYSICAL REVIEW D LA English DT Article ID HEAVY-ION COLLISIONS; BETHE-SALPETER-EQUATION; BHABHA-SCATTERING; WAVE-EQUATIONS; PARTICLES; POSITRON; DYNAMICS; SYSTEMS; PEAK; PARAPOSITRONIUM AB In quark-model calculations of the meson spectrum, fully covariant two-body Dirac equations dictated by Dirac's relativistic constraint mechanics gave a good fit to the entire meson mass spectrum (excluding flavor mixing) with constituent world scalar and vector potentials depending on just one or two parameters. In this paper, we investigate the properties of these equations that made them work so well by solving them numerically for quantum electrodynamics (QED) and related field theories. The constraint formalism generates a relativistic quantum mechanics defined by two coupled Dirac equations on a 16-component wave function which contain Lorentz-covariant constituent potentials that are initially undetermined. An exact Pauli reduction leads to a second-order relativistic Schrodinger-like equation for a reduced eight-component wave function determined by an effective interaction-the quasipotential. We first determine perturbatively to lowest order the relativistic quasipotential for the Schrodinger-like equation by comparing that form with one derived from the Bethe-Salpeter equation. Insertion of this perturbative information into the minimal interaction structures of the two-body Dirac equations then completely determines their interaction structures. Then we give a procedure for constructing the full 16-component solution to our coupled first-order Dirac equations from a solution of the second-order equation for the reduced wave function. Next, we show that a perturbative treatment of these equations yields the standard spectral results for QED and related interactions. The relativistic potentials in our exact Schrodinger-like equations incorporate detailed minimal interaction and dynamical recoil effects characteristic of field theory yet, unlike the approximate Fermi-Breit forms, do not lead to singular wave functions for any angular momentum states. Hence, we are able to solve them numerically and compare the resultant nonperturbative energy eigenvalues to their perturbative counterparts and hence to standard field-theoretic results. We find that nonperturbative solution of our equation produces energy levels that agree with the perturbative spectrum through order alpha4. Surprisingly, this agreement depends crucially on inclusion of coupling between upper-upper and lower-lower components of our 16-component Dirac wave functions and on the short-distance behavior of the relativistic quasipotential in the associated Schrodinger-like equation. To examine speculations that the effective potentials (including the angular momentum barrier) for some states in the e+e- system may become attractive for small separations, we study whether our equations predict pure QED resonances in the e+e- system which might correspond to the anomalous positron peaks in the yield of e+e- pairs seen in heavy-ion collisions. For the P-3(0) state we find that, even though the quasipotential becomes attractive at separations near 10 fm and overwhelms the centrifugal barrier, the attraction is not strong enough to hold a resonance. This result contradicts recent predictions of such states by other authors based on numerical solutions of three-dimensional truncations of the Bethe-Salpeter equation for which the QED bound-state wave equation has been treated successfully only by perturbation theory. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP CRATER, HW (reprint author), UNIV TENNESSEE,INST SPACE,TULLAHOMA,TN 37388, USA. NR 71 TC 55 Z9 55 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1992 VL 46 IS 11 BP 5117 EP 5155 DI 10.1103/PhysRevD.46.5117 PG 39 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB320 UT WOS:A1992KB32000041 ER PT J AU DIMOPOULOS, S HALL, LJ RABY, S AF DIMOPOULOS, S HALL, LJ RABY, S TI PREDICTIONS FOR NEUTRAL K-MESON AND B-MESON PHYSICS SO PHYSICAL REVIEW D LA English DT Note ID CP VIOLATION; QUARK MASS; TOP QUARK; SUPERGRAVITY; SUPERSYMMETRY; DECAYS; MODEL AB Using supersymmetric grand unified theories, we have recently invented a framework which allows the prediction of three quark masses, two of the parameters of the Kobayashi-Maskawa matrix, and tanbeta, the ratio of the two electroweak vacuum expectation values. These predictions are used to calculate epsilon and epsilon' in the kaon system, the mass mixing in the B(d)0 and B(s)0 systems, and the size of CP asymmetries in the decays of neutral B mesons to explicit final states of given CP. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,THEORET PHYS GRP,BERKELEY,CA 94720. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. RP DIMOPOULOS, S (reprint author), STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305, USA. NR 24 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD DEC 1 PY 1992 VL 46 IS 11 BP R4793 EP R4798 PG 6 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KB320 UT WOS:A1992KB32000001 ER PT J AU GRATZ, AJ NELLIS, WJ CHRISTIE, JM BROCIOUS, W SWEGLE, J CORDIER, P AF GRATZ, AJ NELLIS, WJ CHRISTIE, JM BROCIOUS, W SWEGLE, J CORDIER, P TI SHOCK METAMORPHISM OF QUARTZ WITH INITIAL TEMPERATURES -170-DEGREES-C TO + 1000-DEGREES-C SO PHYSICS AND CHEMISTRY OF MINERALS LA English DT Article ID HIGH-PRESSURE; ALPHA-QUARTZ; AMORPHOUS TRANSITION; MOLECULAR-DYNAMICS; DEFORMATION; CRYSTAL; GLASS; SIO2; TRANSFORMATIONS; SILICA AB Shock experiments on quartz single crystals with initial temperatures -170 to +1000-degrees-C showed that ambient temperature does not affect the type of defects formed but can lower the pressure of complete amorphization. The amount of glass recovered increases with both pressure and temperature, and the shock-induced phase transformation of quartz is temperature-activated with an apparent activation energy of < 60 kJ/mol. The phase transformation is localized along three types of transformation lamellae (narrow, s-shaped, and wide) which contain fractured and/or high-pressure phases. Transformation lamellae are inferred to form by motion of linear collapse zones propagating near the shock front. Equilibrium phases, such as stishovite, were not recovered and are probably not formed at high shock pressures: the dominant transformation mechanism is inferred to be solid-state collapse to a dense, disordered phase. Melting occurs separately by friction along microfaults, but no high-pressure crystal phases are quenched in these zones. Shock of quartz thus produces two types of disordered material, quenched melt (along microfaults) and diaplectic glass (in transformation lamellae); the quenched melt expands during P - T release, leaving it with a density lower than quartz, while recovered diaplectic glass has a density closer to that of quartz. At low pressures (< 15 GPa), quartz transforms mostly by shear melting, while at higher pressures it converts mostly along transformation lamellae. We find that shock paleopiezometers using microstructures are nominally temperature-invariant, so that features observed at impact craters and the K/T boundary require in excess of 10 GPa to form, regardless of the target temperature. Shock comminution will be much more extensive for impacts on cold surfaces due to lack of cementation of fragments by melt glass; shock on hot surfaces could produce much more glass than estimated from room-temperature experiments. Because of the shock-impedance mismatch between quartz specimen and steel capsule, the incident shock wave reverberates up to a final pressure. The dynamic compression process is quasi-isentropic with high strain rates. Preheating and precooling achieves final shock pressures and temperatures representative of single-shock states of room temperature quartz and of quartz on known planetary surfaces. Stress histories were calculated by detailed 1- and 2-dimensional computer simulations. The stress history throughout the sample is relatively uniform, with minor variations during unloading. Significant differences between impact pressures calculated by the shock-impedance-match method and specimen pressures calculated by computer simulations indicate the importance of modeling shock recovery experiments computationally. C1 UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024. SANDIA NATL LABS,DEPT SOLID DYNAM,ALBUQUERQUE,NM 87185. UNIV LILLE 1,F-59655 VILLENEUVE DASCQ,FRANCE. RP GRATZ, AJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Cordier, Patrick/D-2357-2012 OI Cordier, Patrick/0000-0002-1883-2994 NR 91 TC 76 Z9 76 U1 2 U2 10 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0342-1791 J9 PHYS CHEM MINER JI Phys. Chem. Miner. PD DEC PY 1992 VL 19 IS 5 BP 267 EP 288 PG 22 WC Materials Science, Multidisciplinary; Mineralogy SC Materials Science; Mineralogy GA JZ949 UT WOS:A1992JZ94900001 ER PT J AU HEDRICK, CL LEBOEUF, JN SPONG, DA AF HEDRICK, CL LEBOEUF, JN SPONG, DA TI ALPHA-ALFVEN LOCAL DISPERSION-RELATION AND SOLUTIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID IGNITED TOKAMAK; PARTICLES; MODES; PLASMA; EXCITATION; DESTABILIZATION; INSTABILITY; EIGENMODES; WAVES; IONS AB The local dispersion relation for shear and kinetic Alfven waves is derived for arbitrary alpha particle distribution functions and analyzed for a set of representative distribution functions. Including both the velocity dependence of magnetic drift and temperature gradients is found to have the most striking effect on the partial growth rate associated with alpha particles for shear Alfven waves. Parallel electric field effects are included and found to make significant changes in the damping associated with electrons and ions. The formalism parallels that used in reduced magnetohydrodynamics, so that it can be readily extended to calculations incorporating more detailed and realistic equilibrium geometry RP HEDRICK, CL (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Spong, Donald/C-6887-2012 OI Spong, Donald/0000-0003-2370-1873 NR 33 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1992 VL 4 IS 12 BP 3869 EP 3882 DI 10.1063/1.860344 PG 14 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700007 ER PT J AU BARNES, DC TURNER, L AF BARNES, DC TURNER, L TI NONNEUTRAL PLASMA COMPRESSION TO ULTRAHIGH DENSITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB Oscillations of a cold, homogeneous, non-neutral plasma spheroid are considered. A new class of purely compressional, large-amplitude, nonlinear oscillations is found. With a periodically time-varying external electrostatic quadrupole and a static magnetic field, such oscillations periodically can produce arbitrarily large plasma densities with only a modest swing in the applied quadrupole. In limiting cases, one- to three-dimensional plasma oscillations are true normal modes, requiring no variation of the applied quadrupole. For appropriate parameters, peak density is associated with a very "soft core," so that an extremely high density is associated with a very modest size at minimum density. Further, cold-plasma stability is examined for these eases. For three-dimensional oscillations, all modes are stable. For two-dimensional oscillations, modes with intermediate axial wavelengths are not examined in detail. Long-axial-wavelength modes are found to be unstable only for small oscillation amplitudes. These modes are stable at sufficiently large oscillation amplitude. Those modes with a very short axial wavelength are always stable. Thus, it is very likely that extremely high densities may be produced in a compact system. RP BARNES, DC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 11 TC 10 Z9 10 U1 1 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 3890 EP 3901 DI 10.1063/1.860346 PG 12 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700009 ER PT J AU HEDRICK, CL LEBOEUF, JN AF HEDRICK, CL LEBOEUF, JN TI LANDAU FLUID EQUATIONS FOR ELECTROMAGNETIC AND ELECTROSTATIC FLUCTUATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; TOKAMAKS; SHEAR AB Closure relations are developed to allow approximate treatment of Landau damping and growth using fluid equations for both electrostatic and electromagnetic modes. The coefficients in these closure relations are related to approximations of the plasma dispersion function by ratios of polynomials. Thirteen different numerical sets of coefficients are given and explicitly related to previous tits to the plasma dispersion function. The application of the techniques presented in this paper is illustrated with the specific example of resistive modes. Comparisons of full kinetic and approximate results are made for the solutions to the dispersion relation, radially resolved modes in sheared magnetic geometry, and the plasma dispersion function itself. RP HEDRICK, CL (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 27 TC 22 Z9 22 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1992 VL 4 IS 12 BP 3915 EP 3934 DI 10.1063/1.860348 PG 20 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700011 ER PT J AU MATTOR, N AF MATTOR, N TI CAN LANDAU-FLUID MODELS DESCRIBE NONLINEAR LANDAU DAMPING SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GRADIENT-DRIVEN TURBULENCE; WEAK TURBULENCE; DRIFT MODES; INSTABILITY AB The question of whether the "Landau-fluid" description of wave-particle resonances [e.g., Hammett and Perkins, Phys. Rev. Lett. 64, 3019 (1990)] can describe nonlinear Landau damping is addressed. It is found that this model can provide an adequate description of the Compton scattering of electron drift waves, but fails in the case of ion-temperature-gradient-driven modes near the threshold. The general conclusion is that Landau-fluid models have difficulty describing the dynamics associated with the product of two or more deeply resonant propagators. RP MATTOR, N (reprint author), LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551, USA. NR 15 TC 20 Z9 20 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 3952 EP 3961 DI 10.1063/1.860350 PG 10 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700013 ER PT J AU RAX, JM AF RAX, JM TI COMPTON HARMONIC RESONANCES, STOCHASTIC INSTABILITIES, QUASI-LINEAR DIFFUSION, AND COLLISIONLESS DAMPING WITH ULTRA-HIGH-INTENSITY LASER WAVES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ELECTROMAGNETIC-WAVES; SCATTERING; PLASMAS; PULSES AB The dynamics of an electron in a finite set of linearly or circularly polarized ultra-high-intensity (above 10(18) W/cm2) laser waves is investigated within the framework of a Hamiltonian analysis. The Compton harmonic resonances are identified as the source of various stochastic instabilities. The stochasticity threshold due to resonance overlap is calculated and the structure of the resonances is analyzed. The quasilinear kinetic equation describing the evolution of the electron distribution function is derived, and the associated collisionless damping coefficient is calculated. The implications of these new processes are considered and discussed. C1 CEA,ASSOC EURATOM FUS CONTROLEE,F-13108 ST PAUL DURANCE,FRANCE. RP RAX, JM (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 32 TC 35 Z9 35 U1 2 U2 5 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 3962 EP 3972 DI 10.1063/1.860299 PG 11 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700014 ER PT J AU HSU, CT SHAING, KC GORMLEY, RP SIGMAR, DJ AF HSU, CT SHAING, KC GORMLEY, RP SIGMAR, DJ TI BOOTSTRAP CURRENT INDUCED BY FUSION BORN ALPHA-PARTICLES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID NEOCLASSICAL TRANSPORT; PLASMAS AB The bootstrap current produced by fusion born alpha particles is obtained, retaining effects of slowing down drag, pitch angle scattering, and arbitrary aspect ratio. The result is presented both as a summation of a rapidly converging series and a simple Pade approximation good for arbitrary aspect ratio. Quantitative results are derived using the International Thermonuclear Experimental Reactor (ITER) [Plasma phys. Controlled Nucl. Fusion Res. (International Atomic Energy Agency, Vienna, 1989), Vol. 3, p. 214] parameters C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP HSU, CT (reprint author), MIT,CTR PLASMA FUS,167 ALBANY ST,NW16 260,CAMBRIDGE,MA 02139, USA. NR 10 TC 29 Z9 31 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 4023 EP 4032 DI 10.1063/1.860308 PG 10 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700023 ER PT J AU HAHM, TS AF HAHM, TS TI TRAPPED-PARTICLE DYNAMICS IN TOROIDALLY ROTATING PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID EDGE ELECTRIC-FIELD; H-MODE PLASMAS; DENSITY-FLUCTUATIONS; TOKAMAK; TURBULENCE; TRANSPORT; DRIVEN; INSTABILITY; TFTR; MOMENTUM AB A detailed single particle orbit analysis in toroidally rotating plasma yields new analytical formulas for the second adiabatic invariant, the bounce frequency, and the precession frequency up to the first-order correction in rho(pi) (poloidal ion gyroradius)/L(nu) (scale length of rotation velocity), for toroidal flow values of the order of ion thermal velocity. Toroidal plasma rotation effects on the trapped ion instabilities in tokamaks are investigated in the context of local theory. Toroidal plasma rotation increases both the fraction of trapped particles and their precession drift velocity. Consequently, the growth rate of trapped ion instability increases in both dissipative and collisionless regimes. RP HAHM, TS (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 38 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1992 VL 4 IS 12 BP 4046 EP 4050 DI 10.1063/1.860310 PG 5 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700025 ER PT J AU ROSE, HA DUBOIS, DF AF ROSE, HA DUBOIS, DF TI MODIFICATION OF STIMULATED BRILLOUIN, SATURATED RAMAN-SCATTERING AND STRONG LANGMUIR TURBULENCE BY NONLOCAL HEAT-TRANSPORT - REPLY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note ID PLASMAS RP ROSE, HA (reprint author), LOS ALAMOS NATL LAB,MAIL STOP B262,LOS ALAMOS,NM 87545, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD DEC PY 1992 VL 4 IS 12 BP 4192 EP 4192 DI 10.1063/1.860274 PG 1 WC Physics, Fluids & Plasmas SC Physics GA KA787 UT WOS:A1992KA78700043 ER PT J AU CAMPBELL, CE KROTSCHECK, E PANG, T AF CAMPBELL, CE KROTSCHECK, E PANG, T TI ELECTRON CORRELATIONS IN ATOMIC SYSTEMS SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID INHOMOGENEOUS QUANTUM-SYSTEMS; DENSITY FUNCTIONAL FORMALISM; MONTE-CARLO CALCULATIONS; COUPLED-CLUSTER METHOD; LOW EXCITED-STATES; FULL CCSDT MODEL; GROUND-STATE; WAVE-FUNCTIONS; CORRELATION-ENERGY; LINEAR RESPONSE AB The Feenberg-Jastrow Euler-Lagrange theory for inhomogeneous quantum liquids is developed to study many-electron atomic systems. We describe the ground state of the atoms by the Jastrow-Feenberg ansatz for the wave function. The generalized Born-Green-Yvon and Fermi-hypernetted-chain equations are used to relate the wave function to reduced distribution functions. The variational wave function is optimized by a generalized Hartree-Fock equation for the single-particle orbitals and an Euler-Lagrange equation for the two-body correlations. We calculate the electron correlation energies for various atoms and ions with four and ten electrons. Our theoretical results for the correlation energy of the ten-electron systems are within 93% of the experimental data. We discuss the behavior of the exchange-correlation holes in the atomic systems and analyze the qualitative difference of the correlations between the localized and extended states. The theory does not depend on any input parameters and only involves the Coulomb interaction among electrons and the nuclear charge. The relationship of this theory to density functional theory and configuration interaction theory is discussed. C1 LOS ALAMOS NATL LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA. UNIV MINNESOTA, SCH PHYS & ASTRON, MINNEAPOLIS, MN 55455 USA. UNIV MINNESOTA, INST THEORET PHYS, MINNEAPOLIS, MN 55455 USA. TEXAS A&M UNIV SYST, CTR THEORET PHYS, DEPT PHYS, COLL STN, TX 77843 USA. UNIV NEVADA, DEPT PHYS, LAS VEGAS, NV 89154 USA. RP CAMPBELL, CE (reprint author), LOS ALAMOS NATL LAB, CTR MAT SCI, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 102 TC 15 Z9 15 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 EI 1873-6270 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD DEC PY 1992 VL 223 IS 1 BP 1 EP 42 DI 10.1016/0370-1573(92)90119-K PG 42 WC Physics, Multidisciplinary SC Physics GA KE600 UT WOS:A1992KE60000001 ER PT J AU TREWHELLA, J GLYDE, HR AF TREWHELLA, J GLYDE, HR TI NAYSAYING THE NEUTRON-SCATTERING-SOCIETY - REPLY SO PHYSICS TODAY LA English DT Letter C1 UNIV DELAWARE,NSSA,NEWARK,DE 19716. RP TREWHELLA, J (reprint author), LOS ALAMOS NATL LAB,NSSA,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD DEC PY 1992 VL 45 IS 12 BP 15 EP 15 PG 1 WC Physics, Multidisciplinary SC Physics GA KE695 UT WOS:A1992KE69500007 ER PT J AU SAUTER, M KENDE, H AF SAUTER, M KENDE, H TI LEVELS OF BETA-GLUCAN AND LIGNIN IN ELONGATING INTERNODES OF DEEP-WATER RICE SO PLANT AND CELL PHYSIOLOGY LA English DT Article DE CELL WALL; BETA-GLUCAN; INTERNODAL ELONGATION; LIGNIN; RICE (ORYZA-SATIVA L) ID DEEP-WATER RICE; CELL-WALLS; GROWTH-RESPONSE; GIBBERELLIN; COLEOPTILES; SUBMERGENCE; ETHYLENE; PROTEIN; ENZYMES; SATIVA AB Partial submergence or treatment with either ethylene or gibberellic acid (GA) induces rapid growth in deepwater rice (Oryza sativa L.). We correlated the synthesis of two cell wall components with two phases of internodal elongation, namely (1 --> 3,1 --> 4)-beta-glucan formation with cell elongation and lignification with differentiation of the secondary cell wall and cessation of growth. The content of beta-glucan was highest in the zone of cell elongation in internodes of air-grown plants and plants that were induced to grow rapidly by submergence. In the intercalary meristem and in the differentiation zone of the internode, beta-glucan levels were ca. 70% lower than in the zone of cell elongation. The outer cell layers, enriched in epidermis, contained more beta-glucan in submerged, rapidly growing internodes than in air-grown, control internodes. The beta-glucan content of the inner, parenchymal tissue was unaffected or slightly lowered by submergence. The epidermis appears to be the growth-limiting structure of rapidly growing rice internodes. We hypothesize that elevated levels of beta-glucan contribute to elongation growth by increasing the extensibility of the cell wall. Lignification was monitored by measuring the content of lignin and the activities of two enzymes of the lignin biosynthetic pathway, coniferyl alcohol dehydrogenase (CAD) and phenylalanine ammonia-lyase (PAL), in growing and non-growing regions of the internode. Using submerged whole plants and GA3-treated excised stem segments, we showed that lignin content and CAD activity were up to sixfold lower in newly formed internodal tissue of rapidly growing rice than in slowly growing tissue. No differences were observed in parts of the internode that had been formed prior to induction of growth. PAL activity was reduced throughout the internode of submerged plants. We conclude that lignification is one of the processes that is suppressed to permit rapid growth. RP SAUTER, M (reprint author), MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824, USA. NR 28 TC 32 Z9 35 U1 1 U2 5 PU JAPANESE SOC PLANT PHYSIOLOGISTS PI KYOTO PA SHIMOTACHIURI OGAWA HIGASHI KAMIKYOKU, KYOTO 602, JAPAN SN 0032-0781 J9 PLANT CELL PHYSIOL JI Plant Cell Physiol. PD DEC PY 1992 VL 33 IS 8 BP 1089 EP 1097 PG 9 WC Plant Sciences; Cell Biology SC Plant Sciences; Cell Biology GA KD020 UT WOS:A1992KD02000007 ER PT J AU REBUT, PH ADAMS, JM ALPER, B ALTMANN, H ANDERSEN, A ANDREW, P ALIARSHAD, S BAILEY, W BALET, B BARABASCHI, P BARANOV, Y BARKER, P BARNSLEY, R BARONIAN, M BARTLETT, DV BELL, AC BENALI, G BERTOLI, P BERTOLINI, E BHATNAGAR, V BICKLEY, AJ BOND, D BONICELLI, T BOOTH, SJ BOSIA, G BOTMAN, M BOUCHER, D BOUCQUEY, P BRANDON, M BREGER, P BRELEN, H BREWERTON, WJ BRINKSCHULTE, H BROWN, T BRUSATI, M BUDD, T BURES, M BURTON, P BUSINARO, T BUTCHER, P BUTTGEREIT, H CALDWELLNICHOLS, C CAMPBELL, DJ CAMPLING, D CARD, P CELENTANO, G CHALLIS, CD CHANKIN, AV CHERUBINI, A CHIRON, D CHRISTIANSEN, J CHUILON, P CLAESEN, R CLEMENT, S CLIPSHAM, E COAD, JP COFFEY, IH COLTON, A COMISKEY, M CONROY, S COOKE, M COOPER, S CORDEY, JG CORE, W CORRIGAN, G CORTI, S COSTLEY, AE COTTRELL, G COX, M CRAWLEY, P DACOSTA, O DAVIES, N DAVIES, SJ DEBLANK, H DEESCH, H DEKOCK, L DEKSNIS, E DELIYANAKUS, N DENNEHINNOV, GB DESCHAMPS, G DICKSON, WJ DIETZ, KJ DINES, A DMITRENKO, SL DMITRIEVA, M DOBBING, J DOLGETTA, N DORLING, SE DOYLE, PG DUCHS, DF DUQUENOY, H EDWARDS, A EHRENBERG, J EKEDAHL, A ELEVANT, T ERENTS, SK ERIKSSON, LG FAJEMIROKUN, H FALTER, H FREILING, J FROGER, C FROISSARD, P FULLARD, K GADEBERG, M GALETSAS, A GALBIATI, L GAMBIER, D GARRIBBA, M GAZE, P GIANNELLA, R GIBSON, A GILL, RD GIRARD, A GONDHALEKAR, A GOODALL, D GORMEZANO, C GOTTARDI, NA GOWERS, C GREEN, BJ HAANGE, R HAIGH, A HANCOCK, CJ HARBOUR, PJ HAWKES, NC HAYNES, P HEMMERICH, JL HENDER, T HOEKZEMA, J HORTON, L HOW, J HOWARTH, PJ HUART, M HUGHES, TP HUGUET, M HURD, F IDA, K INGRAM, B IRVING, M JACQUINOT, J JAECKEL, H JAEGER, JF JANESCHITZ, G JANKOWICZ, Z JARVIS, ON JENSEN, F JONES, EM JONES, LPDF JONES, TTC JUNGER, JF JUNIQUE, F KAYE, A KEEN, BE KEILHACKER, M KERNER, W KIDD, NJ KONIG, R KONSTANTELLOS, A KUPSCHUS, P LASSER, R LAST, JR LAUNDY, B LAUROTARONI, L LAWSON, K LENNHOLM, M LINGERTAT, J LITUNOVSKI, RN LOARTE, A LOBEL, R LOMAS, P LOUGHLIN, M LOWRY, C MAAS, AC MACKLIN, B MAGGI, CF MAGYAR, G MARCHESE, V MARCUS, F MART, J MARTIN, D MARTIN, E MARTINSOLIS, R MASSMANN, P MATTHEWS, G MCBRYAN, H MCCRACKEN, G MERIGUET, P MIELE, P MILLS, SF MILLWARD, P MINARDI, E MOHANTI, R MONDINO, PL MONTVAI, A MORGAN, P MORSI, H MURPHY, G NAVE, F NEUDATCHIN, S NEWBERT, G NEWMAN, M NIELSEN, P NOLL, P OBERT, W OBRIEN, D OROURKE, J OSTROM, R OTTAVIANI, M PAPASTERGIOU, S PASINI, D PATEL, B PEACOCK, A PEACOCK, N PEARCE, RJM PEARSON, D PEPEDESILVA, R PERINIC, G PERRY, C PICK, MA PLANCOULAINE, J POFFE, JP POHLCHEN, R PORCELLI, F PORTE, L PRENTICE, R PUPPIN, S PUTVINSKII, S RADFORD, G RAIMONDI, T RAMOSDEANDRADE, MC RAPISARDA, M REBUT, PH REICHLE, R RICHARDS, S RIGHI, E RIMINI, F ROLFE, A ROSS, RT ROSSI, L RUSS, R SACK, HC SADLER, G SAIBENE, G SALANAVE, JL SANAZZARO, G SANTAGIUSTINA, A SARTORI, R SBORCHIA, C SCHILD, P SCHMID, M SCHMIDT, G SCHROEPF, H SCHUNKE, B SCOTT, SM SIBLEY, A SIMONINI, R SIPS, ACC SMEULDERS, P SMITH, R STAMP, M STANGEBY, P START, DF STEED, CA STORK, D STOTT, PE STUBBERFIELD, P SUMMERS, D SUMMERS, H SVENSSON, L TAGLE, JA TANGA, A TARONI, A TERELLA, C TESINI, A THOMAS, PR THOMPSON, E THOMSEN, K TREVALION, P TUBBING, B TIBONE, F VANDERBEKEN, H VLASES, G VONHELLERMANN, M WADE, T WALKER, C WARD, D WATKINS, ML WATSON, MJ WEBER, S WESSON, J WIJNANDS, TJ WILKS, J WILSON, D WINKEL, T WOLF, R WONG, D WOODWARD, C WYKES, M YOUNG, ID ZANNELLI, L ZOLFAGHARI, A ZULLO, G ZWINGMANN, W AF REBUT, PH ADAMS, JM ALPER, B ALTMANN, H ANDERSEN, A ANDREW, P ALIARSHAD, S BAILEY, W BALET, B BARABASCHI, P BARANOV, Y BARKER, P BARNSLEY, R BARONIAN, M BARTLETT, DV BELL, AC BENALI, G BERTOLI, P BERTOLINI, E BHATNAGAR, V BICKLEY, AJ BOND, D BONICELLI, T BOOTH, SJ BOSIA, G BOTMAN, M BOUCHER, D BOUCQUEY, P BRANDON, M BREGER, P BRELEN, H BREWERTON, WJ BRINKSCHULTE, H BROWN, T BRUSATI, M BUDD, T BURES, M BURTON, P BUSINARO, T BUTCHER, P BUTTGEREIT, H CALDWELLNICHOLS, C CAMPBELL, DJ CAMPLING, D CARD, P CELENTANO, G CHALLIS, CD CHANKIN, AV CHERUBINI, A CHIRON, D CHRISTIANSEN, J CHUILON, P CLAESEN, R CLEMENT, S CLIPSHAM, E COAD, JP COFFEY, IH COLTON, A COMISKEY, M CONROY, S COOKE, M COOPER, S CORDEY, JG CORE, W CORRIGAN, G CORTI, S COSTLEY, AE COTTRELL, G COX, M CRAWLEY, P DACOSTA, O DAVIES, N DAVIES, SJ DEBLANK, H DEESCH, H DEKOCK, L DEKSNIS, E DELIYANAKUS, N DENNEHINNOV, GB DESCHAMPS, G DICKSON, WJ DIETZ, KJ DINES, A DMITRENKO, SL DMITRIEVA, M DOBBING, J DOLGETTA, N DORLING, SE DOYLE, PG DUCHS, DF DUQUENOY, H EDWARDS, A EHRENBERG, J EKEDAHL, A ELEVANT, T ERENTS, SK ERIKSSON, LG FAJEMIROKUN, H FALTER, H FREILING, J FROGER, C FROISSARD, P FULLARD, K GADEBERG, M GALETSAS, A GALBIATI, L GAMBIER, D GARRIBBA, M GAZE, P GIANNELLA, R GIBSON, A GILL, RD GIRARD, A GONDHALEKAR, A GOODALL, D GORMEZANO, C GOTTARDI, NA GOWERS, C GREEN, BJ HAANGE, R HAIGH, A HANCOCK, CJ HARBOUR, PJ HAWKES, NC HAYNES, P HEMMERICH, JL HENDER, T HOEKZEMA, J HORTON, L HOW, J HOWARTH, PJ HUART, M HUGHES, TP HUGUET, M HURD, F IDA, K INGRAM, B IRVING, M JACQUINOT, J JAECKEL, H JAEGER, JF JANESCHITZ, G JANKOWICZ, Z JARVIS, ON JENSEN, F JONES, EM JONES, LPDF JONES, TTC JUNGER, JF JUNIQUE, F KAYE, A KEEN, BE KEILHACKER, M KERNER, W KIDD, NJ KONIG, R KONSTANTELLOS, A KUPSCHUS, P LASSER, R LAST, JR LAUNDY, B LAUROTARONI, L LAWSON, K LENNHOLM, M LINGERTAT, J LITUNOVSKI, RN LOARTE, A LOBEL, R LOMAS, P LOUGHLIN, M LOWRY, C MAAS, AC MACKLIN, B MAGGI, CF MAGYAR, G MARCHESE, V MARCUS, F MART, J MARTIN, D MARTIN, E MARTINSOLIS, R MASSMANN, P MATTHEWS, G MCBRYAN, H MCCRACKEN, G MERIGUET, P MIELE, P MILLS, SF MILLWARD, P MINARDI, E MOHANTI, R MONDINO, PL MONTVAI, A MORGAN, P MORSI, H MURPHY, G NAVE, F NEUDATCHIN, S NEWBERT, G NEWMAN, M NIELSEN, P NOLL, P OBERT, W OBRIEN, D OROURKE, J OSTROM, R OTTAVIANI, M PAPASTERGIOU, S PASINI, D PATEL, B PEACOCK, A PEACOCK, N PEARCE, RJM PEARSON, D PEPEDESILVA, R PERINIC, G PERRY, C PICK, MA PLANCOULAINE, J POFFE, JP POHLCHEN, R PORCELLI, F PORTE, L PRENTICE, R PUPPIN, S PUTVINSKII, S RADFORD, G RAIMONDI, T RAMOSDEANDRADE, MC RAPISARDA, M REBUT, PH REICHLE, R RICHARDS, S RIGHI, E RIMINI, F ROLFE, A ROSS, RT ROSSI, L RUSS, R SACK, HC SADLER, G SAIBENE, G SALANAVE, JL SANAZZARO, G SANTAGIUSTINA, A SARTORI, R SBORCHIA, C SCHILD, P SCHMID, M SCHMIDT, G SCHROEPF, H SCHUNKE, B SCOTT, SM SIBLEY, A SIMONINI, R SIPS, ACC SMEULDERS, P SMITH, R STAMP, M STANGEBY, P START, DF STEED, CA STORK, D STOTT, PE STUBBERFIELD, P SUMMERS, D SUMMERS, H SVENSSON, L TAGLE, JA TANGA, A TARONI, A TERELLA, C TESINI, A THOMAS, PR THOMPSON, E THOMSEN, K TREVALION, P TUBBING, B TIBONE, F VANDERBEKEN, H VLASES, G VONHELLERMANN, M WADE, T WALKER, C WARD, D WATKINS, ML WATSON, MJ WEBER, S WESSON, J WIJNANDS, TJ WILKS, J WILSON, D WINKEL, T WOLF, R WONG, D WOODWARD, C WYKES, M YOUNG, ID ZANNELLI, L ZOLFAGHARI, A ZULLO, G ZWINGMANN, W TI THE JET PRELIMINARY TRITIUM EXPERIMENT SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK AB The first tokamak discharges with deuterium-tritium mixtures have been carried out in the Joint European Torus (JET). The main objectives were to produce more than 1MW of fusion power in a controlled way, to determine tritium retention in torus systems and to establish effective means of tritium removal. The experiments were undertaken within limits imposed by restrictions on vessel activation and tritium usage. Deuterium plasmas were heated by high power deuterium neutral beams from fourteen sources and fuelled by two neutral beam sources injecting tritium. In the be D-T discharge, the tritium concentration was about 11 % at peak performance, when total neutron emission rate was 6.0 x 10(17) s-1, with 1.7MW of fusion power. The fusion amplification factor, Q(DT) was 0. 1 5. With optimum tritium concentration, this pulse would have produced a fusion power almost-equal-to 5MW and nominal Q(DT)=0.46. The same extrapolation for the best pure deuterium discharge gives about 11 MW and a nominal Q(DT)=1. 14. Techniques for introducing, tracking, monitoring and recovering tritium were highly effective. C1 UKAEA,HARWELL,OXON,ENGLAND. UNIV LEICESTER,LEICESTER LE1 7RH,ENGLAND. UNIV COMPLUTENSE MADRID,MADRID 3,SPAIN. HUNGARIAN ACAD SCI,CENT RES INST PHYS,H-1525 BUDAPEST,HUNGARY. UNIV OXFORD,INST MATH,OXFORD,ENGLAND. UNIV ESSEX,COLCHESTER CO4 3SQ,ESSEX,ENGLAND. FREE UNIV BERLIN,W-1000 BERLIN 33,GERMANY. UNIV BIRMINGHAM,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. ROYAL INST TECHNOL,S-10044 STOCKHOLM 70,SWEDEN. PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. UNIV LONDON,IMPERIAL COLL,LONDON,ENGLAND. UKAEA,CULHAM LAB,ABINGDON OX14 3DB,OXON,ENGLAND. MAX PLANCK INST PLASMA PHYS,W-8046 GARCHING,GERMANY. INST NUCL STUDIES,OTWOCK,POLAND. FOM,INST PLASMAFYS,NIEUWEGEIN,NETHERLANDS. IV KURCHATOV ATOM ENERGY INST,MOSCOW,USSR. UNIV MILAN,DIPARTIMENTO FIS,I-20122 MILAN,ITALY. QUEENS UNIV BELFAST,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. N CAROLINA STATE UNIV,RALEIGH,NC 27695. NATL INST FUS SCI,NAGOYA,JAPAN. UNIV STRATHCLYDE,GLASGOW G1 1XW,SCOTLAND. CIEMAT,MADRID,SPAIN. UNIV TORONTO,INST AEROSP STUDIES,TORONTO M5S 1A1,ONTARIO,CANADA. MV KELDYSH APPL MATH INST,MOSCOW,USSR. ACAD SINICA,INST PLASMA PHYS,HEFEI,PEOPLES R CHINA. LNETI,SAVACEM,PORTUGAL. MIT,CTR PLASMA FUS,BOSTON,MA. ENEA,FRASCATI,ITALY. RI Nave, Maria/A-5581-2013; Ida, Katsumi/E-4731-2016 OI Nave, Maria/0000-0003-2078-6584; Ida, Katsumi/0000-0002-0585-4561 NR 5 TC 7 Z9 7 U1 2 U2 5 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 1749 EP 1758 DI 10.1088/0741-3335/34/13/002 PG 10 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300002 ER PT J AU CARRERAS, BA AF CARRERAS, BA TI TRANSPORT MECHANISMS ACTING IN TOROIDAL DEVICES - A THEORETICIANS VIEW SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK DE TRANSPORT; FLUCTUATIONS; TOKAMAK; STELLARATOR; TURBULENCE ID GRADIENT-DRIVEN TURBULENCE; POLOIDAL FLOW GENERATION; H-MODE TRANSITION; EDGE TURBULENCE; DRIFT INSTABILITIES; ELECTRIC-FIELD; MAGNETIC-FIELD; TOKAMAK EDGE; PLASMA; ROTATION AB Understanding the basic mechanisms of transport in toroidal confinement devices remains one of the more challenging scientific issues in magnetic confinement. At the same time, it is a critical issue for the magnetic fusion program. Recent progress in understanding fluctuations and transport has been fostered by the development and use of new diagnostics, bringing new perspectives on these studies. This has stimulated new theoretical developments. In this paper, a view of the most recent issues and progress in this area is given. The role of long wavelengths in core transport and the relation between shear flows and turbulence at the plasma edge are the primary topics considered in this paper. RP CARRERAS, BA (reprint author), OAK RIDGE NATL LAB,POB 2009,OAK RIDGE,TN 37831, USA. NR 96 TC 17 Z9 17 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 1825 EP 1836 DI 10.1016/0741-3335(92)90225-U PG 12 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300011 ER PT J AU SIGMAR, DJ GANG, F GORMLEY, R HSU, CT SPONG, D AF SIGMAR, DJ GANG, F GORMLEY, R HSU, CT SPONG, D TI ALPHA-PHYSICS IN TOKAMAKS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK AB After briefly reviewing recent experimental and theoretical alpha-particle physics simulation results self-consistent values of the anomalous radial diffusion coefficient D(alpha) from two related theories and/or numerical simulations of energetic alpha-excited shear Alfven wave turbulence are derived and used in a reduced Drift Kinetic Equation (DKE) for the alpha distribution function F(alpha)(r, E, t) which contains a diffusion term 1/r partial derivative/partial derivative r rD(alpha) partial derivative F(alpha)/partial derivative r. Since D(alpha) depends on partial derivative n(alpha)/partial derivative r through omega(*alpha) the ensuing nonlinear diffusion equation for n(alpha) (r, t) is solved iteratively with the DKE for F(alpha) and the effects of D(alpha) on the alpha-power coupling efficiency eta(alpha) and the ignition margin are analyzed for an ITER-like device (''Ignited Operation'' of the ITER conceptual design activity [CDA]). From a power balance point of view the resulting D(alpha) greater than or similar to 1 m2/s appears tolerable, D(alpha) > 3 m2/s would yield eta(alpha) < 0.95. C1 OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37830. RP SIGMAR, DJ (reprint author), MIT,CTR PLASMA FUS,167 ALBANY ST,NW 16-250,CAMBRIDGE,MA 02139, USA. RI Spong, Donald/C-6887-2012 OI Spong, Donald/0000-0003-2370-1873 NR 25 TC 6 Z9 6 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 1845 EP 1857 DI 10.1016/0741-3335(92)90227-W PG 13 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300013 ER PT J AU BURRELL, KH CARLSTROM, TN DOYLE, EJ FINKENTHAL, D GOHIL, P GROEBNER, RJ HILLIS, DL KIM, J MATSUMOTO, H MOYER, RA OSBORNE, TH RETTIG, CL PEEBLES, WA RHODES, TL STJOHN, H STAMBAUGH, RD WADE, MR WATKINS, JG AF BURRELL, KH CARLSTROM, TN DOYLE, EJ FINKENTHAL, D GOHIL, P GROEBNER, RJ HILLIS, DL KIM, J MATSUMOTO, H MOYER, RA OSBORNE, TH RETTIG, CL PEEBLES, WA RHODES, TL STJOHN, H STAMBAUGH, RD WADE, MR WATKINS, JG TI PHYSICS OF THE L-MODE TO H-MODE TRANSITION IN TOKAMAKS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK DE FUSION; TOKAMAK; CONFINEMENT; DIVERTOR; H-MODE; L-MODE; L TO H TRANSITION; DIII-D ID DIII-D TOKAMAK; EDGE ELECTRIC-FIELD; POLOIDAL ROTATION; ION TEMPERATURE; FLUCTUATION MEASUREMENTS; DENSITY-FLUCTUATIONS; ASDEX TOKAMAK; CONFINEMENT; TURBULENCE; SCATTERING AB Combined theoretical and experimental work has resulted in the creation of a paradigm which has allowed semi-quantitative understanding of the edge confinement improvement that occurs in the H-mode. Shear in the E x B flow of the fluctuations in the plasma edge can lead to decorrelation of the fluctuations, decreased radial correlation lengths and reduced turbulent transport. Changes in the radial electric field, the density fluctuations and the edge transport consistent with shear stabilization of turbulence have been seen in several tokamaks. The purpose of this paper is to discuss the most recent data in the light of the basic paradigm of electric field shear stabilization and to critically compare the experimental results with various theories. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV CALIF BERKELEY,BERKELEY,CA 94720. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. OAK RIDGE NATL LAB,OAK RIDGE,TN. RP BURRELL, KH (reprint author), GEN ATOM CO,SAN DIEGO,CA 92138, USA. NR 83 TC 171 Z9 171 U1 1 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 1859 EP 1869 DI 10.1088/0741-3335/34/13/014 PG 11 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300014 ER PT J AU CHRISTIANSEN, JP BALET, B BOUCHER, D CHALLIS, CD CORDEY, JG GORMEZANO, C GOWERS, C KRAMER, G MUIR, DG NEUDATCHIN, SV OROURKE, J SCHMIDT, G STUBBERFIELD, PM TARONI, A TIBONE, F TUBBING, B AF CHRISTIANSEN, JP BALET, B BOUCHER, D CHALLIS, CD CORDEY, JG GORMEZANO, C GOWERS, C KRAMER, G MUIR, DG NEUDATCHIN, SV OROURKE, J SCHMIDT, G STUBBERFIELD, PM TARONI, A TIBONE, F TUBBING, B TI EVIDENCE FOR A LOCAL DIFFUSIVE MODEL OF TRANSPORT IN A TOKAMAK SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK DE FUSION; TOKAMAK; JET; CONFINEMENT; TRANSPORT ID CONFINEMENT AB Three series of recent experiments on JET have been dedicated to energy transport studies. Experiments with pellet injection followed by off-axis ICRH produce a heat sink on axis resulting in an inward thermal heat flux. A diffusive model for thermal flux with no heat pinch can adequately describe the data. It also describes the data from current ramp experiments in which total current is transiently decorrelated from the current distribution. The effective thermal diffusivity in L-mode confinement is found to scale with normalised Larmor radius according to Bohm in a series of non-dimensional scaling experiments. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. MOSCOW ATOM ENERGY INST,MOSCOW,RUSSIA. RP CHRISTIANSEN, JP (reprint author), JET,JOINT UNDERTAKING,ABINGDON OX14 3EA,ENGLAND. NR 19 TC 20 Z9 20 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 1881 EP 1888 DI 10.1088/0741-3335/34/13/016 PG 8 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300016 ER PT J AU FONCK, RJ BRETZ, N COSBY, G DURST, R MAZZUCATO, E NAZIKIAN, R PAUL, S SCOTT, S TANG, W ZARNSTORFF, M AF FONCK, RJ BRETZ, N COSBY, G DURST, R MAZZUCATO, E NAZIKIAN, R PAUL, S SCOTT, S TANG, W ZARNSTORFF, M TI FLUCTUATION MEASUREMENTS IN THE PLASMA INTERIOR ON TFTR SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK ID TOKAMAKS AB New beam emission spectroscopy and correlation reflectometry density fluctuation diagnostics on TFTR allow examination of the crucial long wavelength (k(perpendicular-to rho i) < 0.1) region, where microwave scattering has indicated the bulk of the power density lies. The turbulent spectrum for low k is broadband and dominated by low frequencies (< 200 KHz), and the exact nature of the spectrum is dominated by Doppler effects. These core diagnostics show n/n rising as tau(E) decreases. Radial and poloidal correlation lengths from BES are comparable and are roughly 2-3 cm near the plasma edge and gradually drop to 1-2 cm in the region of r/a = 0.5-0.7. Values < 1.5 cm are indicated deeper in the com region, but precise values await further analysis which takes into account the effects of finite spatial resolution of the BES measurements. A strong anisotropy in the radial and poloidal wavenumber spectra is indicated from the shape of the correlation functions. The poloidal wavenumber spectrum does not increase indefinitely as k goes to 0 cm-1, but has a peak in the range of 1-2 cm-1. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. RP FONCK, RJ (reprint author), UNIV WISCONSIN,DEPT NUCL ENGN & ENGN PHYS,MADISON,WI 53706, USA. NR 12 TC 35 Z9 37 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 1993 EP 1999 DI 10.1016/0741-3335(92)90245-2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300031 ER PT J AU YOUNG, KM JOHNSON, DW AF YOUNG, KM JOHNSON, DW TI THE STATUS OF ALPHA-PARTICLE DIAGNOSTICS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK DE ALPHA-PARTICLES; FUSION PRODUCT PARTICLES; TOKAMAKS; TFTR; COLLECTIVE THOMSON SCATTERING; NEUTRAL PARTICLE ANALYSIS; CHARGE-EXCHANGE RECOMBINATION SPECTROSCOPY ID FUSION PRODUCTS; TOKAMAK; TFTR; JET; SPECTROSCOPY; TRANSPORT; PLASMAS AB There is a flurry of activity to complete alpha-particle diagnostics so that they can undergo some experimental testing in DT plasmas on JET or TFTR prior to implementation on ITER. Successful measurements of escaping charged fusion products have been made in DD plasmas, and the alpha-particle source can be well characterized by neutron profile measurement. These methods can be extrapolated to DT plasmas. Measurement of the confined alpha-particles requires a new technique. Collective Thomson scattering, methods involving charge-exchange interactions and nuclear reactions with impurities will be discussed . Some assessment is given of the capabilities of these techniques, bearing in mind the potential for their use in the physics phase of the ITER program. RP YOUNG, KM (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,POB 451,PRINCETON,NJ 08544, USA. NR 29 TC 3 Z9 3 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 2001 EP 2006 DI 10.1016/0741-3335(92)90246-3 PG 6 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300032 ER PT J AU KRUER, WL WILKS, SC AF KRUER, WL WILKS, SC TI KINETIC SIMULATIONS OF ULTRA-INTENSE LASER PLASMA INTERACTIONS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK AB Kinetic simulations are used to investigate the interaction of an ultra-intense, small spot-size laser beam with a preformed plasma. The beam is sufficiently intense to drive the electrons relativistically and to impart a pressure in excess of hundreds of Mbars to the plasma. Key features of the interaction include generation of electrons and inward-directed ions with energies in the Mev range and strong hole boring which enhances the absorption. The simulations also show self-generated magnetic fields of order 10(8) Gauss, a Rayleigh-Taylor like instability of the light-plasma interface, as well as self-focusing of the laser beam and strong Raman backscatter. RP KRUER, WL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 14 TC 19 Z9 19 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 2061 EP 2064 DI 10.1016/0741-3335(92)90254-4 PG 4 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300040 ER PT J AU BALDIS, HA MONTGOMERY, DS MOODY, JD LABAUNE, C BATHA, SH ESTABROOK, KG BERGER, RL KRUER, WL AF BALDIS, HA MONTGOMERY, DS MOODY, JD LABAUNE, C BATHA, SH ESTABROOK, KG BERGER, RL KRUER, WL TI PARAMETRIC-INSTABILITIES IN LARGE NONUNIFORM LASER PLASMAS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article; Proceedings Paper CT 9TH KIEV INTERNATIONAL CONF ON PLASMA THEORY / 9TH INTERNATIONAL CONGRESS ON WAVES AND INSTABILITIES IN PLASMAS / 19TH EPS CONF ON CONTROLLED FUSION AND PLASMA PHYSICS CY JUN 29-JUL 03, 1992 CL INNSBRUCK, AUSTRIA SP EUROPEAN PHYS SOC, INT UNION PURE & APPL PHYS, AUSTRIAN MINIST SCI & RES, CTY TYROL, CITY INNSBRUCK, KONGRESSHAUS INNSBRUCK ID INDUCED SPATIAL INCOHERENCE; SUPPRESSION; SCATTERING; LIGHT AB The study of parametric instabilities in laser plasmas is of vital importance for inertial confinement fusion (ICF). The long scale-length plasma encountered in the corona of an ICF target provides ideal conditions for the growth of instabilities such as stimulated Brillouin scattering (SBS), stimulated Raman scattering (SRS), and filamentation /1//2/. These instabilities can have detrimental effects in ICF and their characterization and understanding is of importance. Scattering instabilities are driven through a feedback loop by which the beating between the electromagnetic EM fields of the laser and the scattered light matches the frequency of a local longitudinal mode of the plasma. Any process which interferes with the coherence of this mechanism can substantially alter the behavior of the instability. RP BALDIS, HA (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. OI Montgomery, David/0000-0002-2355-6242 NR 15 TC 7 Z9 7 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD DEC PY 1992 VL 34 IS 13 BP 2077 EP 2081 DI 10.1016/0741-3335(92)90257-7 PG 5 WC Physics, Fluids & Plasmas SC Physics GA KE693 UT WOS:A1992KE69300043 ER PT J AU DING, JM LYCZKOWSKI, RW AF DING, JM LYCZKOWSKI, RW TI 3-DIMENSIONAL KINETIC-THEORY MODELING OF HYDRODYNAMICS AND EROSION IN FLUIDIZED-BEDS SO POWDER TECHNOLOGY LA English DT Article ID GRANULAR FLOW; TUBE WEAR; COMBUSTORS; PARTICLES AB A three-dimensional hydrodynamic kinetic theory granular flow model was developed and used to compute bubble and solids motion in a rectangular fluidized bed. Differences between the computed three-dimensional and two-dimensional bubble and solids motion demonstrate the necessity for three-dimensional hydrodynamic modeling. A kinetic theory model for erosion was derived using Finnie's single-particle ductile erosion model. The erosion rate was found to be proportional to the solids bulk density and to increase with granular temperature near the eroding surfaces. Predicted three-dimensional erosion rates at different operating conditions compare reasonably well with the experimental data taken in a rectangular fluidized bed containing a single tube. Comparisons of two-dimensional and three-dimensional computed erosion rates and patterns clearly show the superiority of three-dimensional modeling. Our theory also confirmed the experimental findings that erosion increases with increasing fluidizing velocity at a fixed particle diameter and with increasing particle size at a fixed fluidizing velocity. C1 ARGONNE NATL LAB,DIV ENERGY SYST,ARGONNE,IL 60439. NR 40 TC 39 Z9 45 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0032-5910 J9 POWDER TECHNOL JI Powder Technol. PD DEC 1 PY 1992 VL 73 IS 2 BP 127 EP 138 DI 10.1016/0032-5910(92)80073-6 PG 12 WC Engineering, Chemical SC Engineering GA KB568 UT WOS:A1992KB56800004 ER PT J AU CAHOON, EB SHANKLIN, J OHLROGGE, JB AF CAHOON, EB SHANKLIN, J OHLROGGE, JB TI EXPRESSION OF A CORIANDER DESATURASE RESULTS IN PETROSELINIC ACID PRODUCTION IN TRANSGENIC TOBACCO SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE FATTY ACID DESATURATION; TRANSGENIC EXPRESSION; UMBELLIFERAE; UNSATURATED FATTY ACID ID CARRIER-PROTEIN DESATURASE; HIGHER-PLANTS; SAFFLOWER; EMBRYOS; FORMS; SEED AB Little is known about the metabolic origin of petroselinic acid (18:1DELTA6cis), the principal fatty acid of the seed oil of most Umbelliferae, Araliaceae, and Garryaceae species. To examine the possibility that petroselinic acid is the product of an acyl-acyl carrier protein (ACP) desaturase, Western blots of coriander and other Umbelliferae seed extracts were probed with antibodies against the DELTA9-stearoyl-ACP desaturase of avocado. In these extracts, proteins of 39 and 36 kDa were detected. Of these, only the 36-kDa peptide was specific to tissues which synthesize petroselinic acid. A cDNA encoding the 36-kDa peptide was isolated from a coriander endosperm cDNA library, placed under control of the cauliflower mosaic virus 35S promoter, and introduced into tobacco by Agrobacterium tumefaciens-mediated transformation. Expression of this cDNA in transgenic tobacco callus was accompanied by the accumulation of petroselinic acid and DELTA4-hexadecenoic acid, both of which were absent from control callus. These results demonstrate the involvement of a 36-kDa putative acyl-ACP desaturase in the biosynthetic pathway of petroselinic acid and the ability to produce fatty acids of unusual structure in transgenic plants by the expression of the gene for this desaturase. C1 MICHIGAN STATE UNIV,DEPT BOT & PLANT PATHOL,E LANSING,MI 48824. MICHIGAN STATE UNIV,DOE-XX,E LANSING,MI 48824. NR 27 TC 138 Z9 142 U1 0 U2 15 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD DEC 1 PY 1992 VL 89 IS 23 BP 11184 EP 11188 DI 10.1073/pnas.89.23.11184 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KA903 UT WOS:A1992KA90300018 PM 1454797 ER PT J AU SCHROEDER, MR RAIKHEL, NV AF SCHROEDER, MR RAIKHEL, NV TI ISOLATION AND CHARACTERIZATION OF PRO-BARLEY LECTIN EXPRESSED IN ESCHERICHIA-COLI SO PROTEIN EXPRESSION AND PURIFICATION LA English DT Article ID CARBOXYL-TERMINAL PROPEPTIDE; INCLUSION-BODIES; PROTEINS; VACUOLES; TOBACCO; PLANTS C1 MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824. NR 20 TC 6 Z9 6 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 1046-5928 J9 PROTEIN EXPRES PURIF JI Protein Expr. Purif. PD DEC PY 1992 VL 3 IS 6 BP 508 EP 511 DI 10.1016/1046-5928(92)90068-8 PG 4 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA KA580 UT WOS:A1992KA58000008 PM 1336690 ER PT J AU RICHTER, M BASRI, G PERLMUTTER, S PENNYPACKER, C AF RICHTER, M BASRI, G PERLMUTTER, S PENNYPACKER, C TI AUTOMATED CCD PHOTOMETRY OF T-TAURI STARS SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC LA English DT Article ID LIGHT VARIABILITY; TIME-SERIES AB T Tauri stars have long been known to undergo irregular variations in brightness. Extended monitoring of these pre-main-sequence, solar-type stars is important to understanding the sources of variations. Using an automated telescope at Leuschner Observatory, we have developed a procedure to acquire differential photometry of classical T Tau stars in Taurus and Auriga. It is almost fully automatic, dramatically reducing the time necessary to process the data. We achieved accuracy of 0.02 mag in eight fields containing target stars down to 13th magnitude. Although most of the T Tau stars did vary, we find possible, but not definitive, periods for several targets. The variations in general are complex, but often are correlated over a few days. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP RICHTER, M (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. RI Perlmutter, Saul/I-3505-2015 OI Perlmutter, Saul/0000-0002-4436-4661 NR 16 TC 10 Z9 10 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 1144 EP 1151 DI 10.1086/133101 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KF116 UT WOS:A1992KF11600003 ER PT J AU AZZIZ, N HAJNAL, F LOWDER, WM MURLEY, P AF AZZIZ, N HAJNAL, F LOWDER, WM MURLEY, P TI STOPPING POWER AND THE CONCEPT OF EFFECTIVE ION CHARGE AT LOW ENERGIES SO RADIATION RESEARCH LA English DT Article ID SLOW IONS; LOSSES C1 IBM CORP, E FISHKILL FACIL, HOPEWELL JCT, NY 12533 USA. RP AZZIZ, N (reprint author), US DOE, ENVIRONM MEASUREMENTS LAB, 376 HUDSON ST, NEW YORK, NY 10014 USA. NR 11 TC 1 Z9 1 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 277 EP 281 DI 10.2307/3578234 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA KF780 UT WOS:A1992KF78000002 PM 1475349 ER PT J AU METTING, NF PALAYOOR, ST MACKLIS, RM ATCHER, RW LIBER, HL LITTLE, JB AF METTING, NF PALAYOOR, ST MACKLIS, RM ATCHER, RW LIBER, HL LITTLE, JB TI INDUCTION OF MUTATIONS BY BISMUTH-212 ALPHA-PARTICLES AT 2 GENETIC-LOCI IN HUMAN B-LYMPHOBLASTS SO RADIATION RESEARCH LA English DT Article ID DIPLOID HUMAN-LYMPHOBLASTS; CULTURED MAMMALIAN-CELLS; THYMIDINE KINASE LOCUS; ACCELERATED HEAVY-IONS; HIGH-LET RADIATIONS; RAY-INDUCED MUTANTS; MOLECULAR CHARACTERIZATION; BIOCHEMICAL ANALYSES; IONIZING-RADIATIONS; ASSAY C1 JOINT CTR RADIAT THERAPY,BOSTON,MA 02115. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP METTING, NF (reprint author), HARVARD UNIV,SCH PUBL HLTH,RADIOBIOL LAB,665 HUNTINGTON AVE,BOSTON,MA 02115, USA. OI Atcher, Robert/0000-0003-4656-2247 FU NCI NIH HHS [CA-09078, CA-47852]; NIEHS NIH HHS [ES-00002] NR 30 TC 29 Z9 29 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 339 EP 345 DI 10.2307/3578242 PG 7 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA KF780 UT WOS:A1992KF78000010 PM 1475356 ER PT J AU NAGASAWA, H LITTLE, JB TSANG, NM SAUNDERS, E TESMER, J STRNISTE, GF AF NAGASAWA, H LITTLE, JB TSANG, NM SAUNDERS, E TESMER, J STRNISTE, GF TI EFFECT OF DOSE-RATE ON THE SURVIVAL OF IRRADIATED HUMAN SKIN FIBROBLASTS SO RADIATION RESEARCH LA English DT Note ID POTENTIALLY LETHAL DAMAGE; CELL-CYCLE PROGRESSION; CHROMOSOMAL-ABERRATIONS; ATAXIA-TELANGIECTASIA; RETINOBLASTOMA; SENSITIVITY; HEREDITARY; RADIATION; STRAINS; REPAIR C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP NAGASAWA, H (reprint author), HARVARD UNIV,SCH PUBL HLTH,RADIOBIOL LAB,665 HUNTINGTON AVE,BOSTON,MA 02115, USA. FU NCI NIH HHS [CA-47542]; NIEHS NIH HHS [ES-00002] NR 12 TC 33 Z9 35 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 375 EP 379 DI 10.2307/3578247 PG 5 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA KF780 UT WOS:A1992KF78000015 PM 1475361 ER PT J AU JONES, DW ONEILL, RV AF JONES, DW ONEILL, RV TI LAND-USE WITH ENDOGENOUS ENVIRONMENTAL DEGRADATION AND CONSERVATION SO RESOURCES AND ENERGY LA English DT Article ID AMAZON BASIN; DEFORESTATION; CAPACITY; BRAZIL AB This paper endogenizes environmental degradation imposed by agriculture in a land-use model by introducing feedbacks between productivity and the application of inputs. Farmers maximize the value of their output by allocating inputs between production and conservation. We study this division of agricultural production resources between cultivation and maintenance with a model of individual agricultural decisions in a small region, possibly the size of a single state or a few states in the United States. We study the model for insights into how degradation-conservation processes modify agricultural production decisions. We give particular attention to how degradation-conservation processes would alter the extensive deforestation occurring in developing countries such as Brazil. The analysis of the model shows a mitigating influence of labor-intensive conservation measures to counteract local environmental degradation. The economic situation of the individual farmer is improved when output prices increase, roads are improved or there is a decrease in the price of purchased inputs. Under these improved conditions, cultivation intensity increases and there is a resultant degradation in the soil, but the degradation is less than would occur without the conservation feedback. In the case of decreased wages, degradation may actually decrease if conservation effects are sensitive to an increase in labor. In all cases, the conservation feedback reduces the environmental impact of increased cultivation. Improving the economic picture for the individual farmer also makes remote sites more profitable and tends to increase the area of deforestation, but this tendency to expand is modified by the increased profitability of cultivation within the existing region. In a number of cases, very effective conservation can actually decrease areal extent of cultivation, leading to more intense cultivation over a smaller region. The analysis also indicates that cultivation should be discouraged on more fragile soils. On the better sites, soil degradation is increased but the soils can withstand more degradation. The total area under cultivation tends to decrease, resulting in less deforestation. RP JONES, DW (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831, USA. NR 44 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-0572 J9 RESOUR ENERG PD DEC PY 1992 VL 14 IS 4 BP 381 EP 400 DI 10.1016/0165-0572(92)90004-Z PG 20 WC Energy & Fuels; Environmental Sciences; Environmental Studies SC Energy & Fuels; Environmental Sciences & Ecology GA KF130 UT WOS:A1992KF13000004 ER PT J AU PORTER, JL SPIELMAN, RB VARGAS, MF MATZEN, MK AF PORTER, JL SPIELMAN, RB VARGAS, MF MATZEN, MK TI DEVELOPMENT OF A SODIUM Z-PINCH LOAD FOR USE ON THE SATURN ACCELERATOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID X-RAY-LASER; IMPLOSIONS; SCHEME; PUMP AB A reliable sodium wire-array z-pinch load has been developed for use on the Saturn accelerator. This load routinely produces implosions with greater-than-or-equal-to 200 GW of power in the heliumlike sodium 1s2-1s2p P-1(1) line at 11 angstrom. Our best shots have used a 12.5-mm-diam, 20-mm-long annular array of 16 75-mum-diam pure sodium wires. This load will allow us to test predictions of gain in the sodium/neon resonant photoexcitation x-ray laser system. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 12 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1992 VL 63 IS 12 BP 5703 EP 5706 DI 10.1063/1.1143352 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA KB362 UT WOS:A1992KB36200029 ER PT J AU REBER, RA FLEETWOOD, DM AF REBER, RA FLEETWOOD, DM TI THERMALLY STIMULATED CURRENT MEASUREMENTS OF SIO2 DEFECT DENSITY AND ENERGY IN IRRADIATED METAL-OXIDE-SEMICONDUCTOR CAPACITORS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID IMPLANTED BURIED OXIDES; GATE MOS CAPACITORS; X-RAY SOURCE; RADIATION HARDNESS; IONIZING-RADIATION; POSTIRRADIATION RESPONSE; CO-60 IRRADIATIONS; ELECTRON INJECTION; DEVICE RESPONSE; SILICON DIOXIDE AB A modular system is described to measure thermally stimulated current (TSC) in irradiated metal-oxide-semiconductor (MOS) capacitors. Custom capacitor mounting allows accurate and convenient measurement of TSC with less than approximately 0.1 pA error at temperatures up to approximately 300-degrees-C. These measurements are used to estimate the densities and energy levels of defects in the SiO2 layer of irradiated MOS capacitors with 45, 98, and 350 nm oxides. For capacitors irradiated under positive bias, TSC measurements provide accurate estimates of radiation-induced trapped-positive-charge density only if performed under negative bias. It is shown that space-charge effects and capacitance changes during TSC measurement can lead to incorrect estimates of the radiation-induced trapped-charge density. We demonstrate that, for n-substrate capacitors, these effects can be minimized if the bias applied during TSC measurement is more negative than the inversion-point voltage on a post-irradiation capacitance-voltage (C-V) curve. This improves prior practice in the literature. Improved estimates are provided for trapped hole energies in SiO2. Further, TSC measurements under proper bias conditions can be combined with conventional high-frequency C-V measurements to estimate hole- and electron-trap densities near the Si/SiO2 interface of irradiated MOS capacitors. To our knowledge, no other method can be used to quantitatively separate the effects of positive and negative oxide-trap charge on the radiation response of MOS devices. Finally, we show that irradiation with approximately 10 keV x rays or approximately 1.25 MeV Co-60 gamma rays leads to similar trapped-hole densities and energies in MOS capacitors with 350 nm nonradiation-hardened oxides. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 95 TC 35 Z9 35 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1992 VL 63 IS 12 BP 5714 EP 5725 DI 10.1063/1.1143354 PG 12 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA KB362 UT WOS:A1992KB36200031 ER PT J AU KOLLIE, TG THACKER, LH AF KOLLIE, TG THACKER, LH TI GAUGE FOR NONDESTRUCTIVE MEASUREMENT OF THE INTERNAL-PRESSURE IN POWDER-FILLED EVACUATED PANEL SUPERINSULATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A gauge that measures the intemal pressure (P) in powder-filled evacuated panels (PEPs) is described. PEPs are superinsulators consisting of high thermal resistivity powders encapsulated in hermetically sealed flexible barriers enclosing a vacuum. To measure P, the gauge supplies a vacuum to the outer surface of the barrier. When the P in the PEP exceeds that supplied by the gauge, the barrier deflects. This deflection is sensed by a bifurcated-fiber-optic light system that converts the motion of the barrier into a voltage proportional to the displacement of the barrier. A pressure transducer mounted in the gauge provides a dc voltage proportional to P at the interface of the barrier and PEP. An X-Y recorder displays the relationship between these two signals. Experiments show that the gauge yields P measurements with uncertainties of +0.27 kPa and reproducibilities of +/-0.16 kPa for PEPs with 0.13-mm-thick flexible polymer barriers. To achieve more accurate measurements, the gauge should first be calibrated on a PEP of known intemal P then used to measure P on similar PEPs with unknown Ps. Besides PEPs, experiments suggest that the gauge can nondestructively and rapidly measure the pressure in a hermetically sealed container having a flexible enclosure, such as vacuum-packaged food. Patent applications for this gauge are on file with the United States Patent Office. RP KOLLIE, TG (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 4 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1992 VL 63 IS 12 BP 5774 EP 5779 DI 10.1063/1.1143362 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA KB362 UT WOS:A1992KB36200040 ER PT J AU NIEVES, LA HIMMELBERGER, JJ RATICK, SJ WHITE, AL AF NIEVES, LA HIMMELBERGER, JJ RATICK, SJ WHITE, AL TI NEGOTIATED COMPENSATION FOR SOLID-WASTE DISPOSAL-FACILITY SITING - AN ANALYSIS OF THE WISCONSIN EXPERIENCE SO RISK ANALYSIS LA English DT Article DE SOLID-WASTE MANAGEMENT; COMPENSATION; PERCEPTIONS; NEGOTIATION ID RISK; NEVADA AB Since enacting a unique facility siting law in 1981, Wisconsin has had unusual success in siting solid-waste management facilities. The law mandates a state-level technical review and licensing process and a local-level negotiation/arbitration process that deals with host community impacts and concerns. Data from the negotiated compensation agreements, a survey of facility proposers, and secondary data for the host communities are analyzed in relation to compensation levels. Concerns with community image and health risks and with facility management and equity issues are found to significantly and substantially increase negotiated compensation levels. In contrast, a focus on logistics and transportation concerns is associated with lower levels of compensation. Compensation increases with facility capacity but at a less than proportional rate. Higher levels of compensation are obtained by communities that accept compensation ''in kind'' in the form of free or reduced fees for host community waste disposal. C1 TELLUS INST,BOSTON,MA. CLARK UNIV,CTR TECHNOL ENVIRNM & DEV,WORCESTER,MA 01610. RP NIEVES, LA (reprint author), ARGONNE NATL LAB EID 900,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 32 TC 11 Z9 11 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1992 VL 12 IS 4 BP 505 EP 511 DI 10.1111/j.1539-6924.1992.tb00707.x PG 7 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA KD447 UT WOS:A1992KD44700006 ER PT J AU MCKONE, TE HOWD, RA AF MCKONE, TE HOWD, RA TI ESTIMATING DERMAL UPTAKE OF NONIONIC ORGANIC-CHEMICALS FROM WATER AND SOIL .1. UNIFIED FUGACITY-BASED MODELS FOR RISK ASSESSMENTS SO RISK ANALYSIS LA English DT Article DE DERMAL UPTAKE CONTAMINATED WATER; CONTAMINATED SOIL; EXPOSURE ASSESSMENT; FUGACITY; SKIN; MASS TRANSFER; PERMEABILITY ID PERCUTANEOUS-ABSORPTION; HUMAN-SKIN; PERMEABILITY; PENETRATION; PERMEATION AB Contamination of water and soil that might eventually contact human skin makes it imperative to include the dermal uptake route in efforts to assess potential environmental health risks. Direct measurements of dermal uptake from either water or soil are only available for a small number of the thousands of chemicals likely to be found in the environment. We propose here a mass-transfer model for estimating skin permeability and dermal uptake for organic chemicals that contaminate soil and water. Statistical relationships between measured permeabilities and chemical properties reveal that permeability varies primarily with the octanol-water partition coefficient (K(ow)) and secondarily with the molecular weight. From these results, we derive a fugacity-based model for skin permeability that addresses the inherent permeability of the skin, the interaction of the skin with the environmental medium on skin (water or soil), and retains a relatively simple algebraic form. Model predictions are compared to measured human skin permeabilities for some 50 compounds in water and four compounds in soil. The model is adjusted to account for dermal uptake during both short-term (10-20 min) and long-term (several hour) exposures. This model is recommended for compounds with molecular weight less than or equal to 280 g. C1 CALIF ENVIRONM PROTECT AGCY,DEPT TOX SUBSTANCES CONTROL,SACRAMENTO,CA 95812. RP MCKONE, TE (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L453,LIVERMORE,CA 94550, USA. NR 41 TC 61 Z9 63 U1 0 U2 6 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1992 VL 12 IS 4 BP 543 EP 557 DI 10.1111/j.1539-6924.1992.tb00711.x PG 15 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA KD447 UT WOS:A1992KD44700010 PM 1480800 ER PT J AU GOLD, LS MANLEY, NB AMES, BN AF GOLD, LS MANLEY, NB AMES, BN TI EXTRAPOLATION OF CARCINOGENICITY BETWEEN SPECIES - QUALITATIVE AND QUANTITATIVE FACTORS SO RISK ANALYSIS LA English DT Article DE INTERSPECIES PREDICTION; HUMAN CARCINOGEN; TARGET SITE; CANCER RISK ASSESSMENT; MITOGENESIS; HERP ID INTERCELLULAR COMMUNICATION; POTENCY DATABASE; ANIMAL BIOASSAYS; RISK ASSESSMENT; RODENT CARCINOGENS; DOSE-RESPONSE; CHRONOLOGICAL SUPPLEMENT; CHEMICAL CARCINOGENESIS; TUMOR PROMOTION; POTENTIAL ROLE AB Prediction of human cancer risk from the results of rodent bioassays requires two types of extrapolation: a qualitative extrapolation from short-lived rodent species to long-lived humans, and a quantitative extrapolation from near-toxic doses in the bioassay to low-level human exposures. Experimental evidence on the accuracy of prediction between closely related species tested under similar experimental conditions (rats, mice, and hamsters) indicates that: (1) if a chemical is positive in one species, it will be positive in the second species about 75% of the time; however, since about 50% of test chemicals are positive in each species, by chance alone one would expect a predictive value between species of about 50%. (2) If a chemical induces tumors in a particular target organ in one species, it will induce tumors in the same organ in the second species about 50% of the time. Similar predictive values are obtained in an analysis of prediction from humans to rats or from humans to mice for known human carcinogens. Limitations of bioassay data for use in quantitative extrapolation are discussed, including constraints on both estimates of carcinogenic potency and of the dose-response in experiments with only two doses and a control. Quantitative extrapolation should be based on an understanding of mechanisms of carcinogenesis, particularly mitogenic effects that are present at high and not low doses. C1 UNIV CALIF BERKELEY,DIV BIOCHEM & MOLEC BIOL,BERKELEY,CA 94720. RP GOLD, LS (reprint author), LAWRENCE BERKELEY LAB,DIV LIFE SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NCI NIH HHS [CA39910]; NIEHS NIH HHS [ESO1896] NR 73 TC 32 Z9 32 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1992 VL 12 IS 4 BP 579 EP 588 DI 10.1111/j.1539-6924.1992.tb00714.x PG 10 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA KD447 UT WOS:A1992KD44700013 PM 1480802 ER PT J AU MOSKOWITZ, PD AF MOSKOWITZ, PD TI PC-GROUP - STATISTICAL SOFTWARE FOR INTERACTIVE DATA-ANALYSIS AND MODEL-BUILDING SO RISK ANALYSIS LA English DT Article RP MOSKOWITZ, PD (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1992 VL 12 IS 4 BP 589 EP 589 DI 10.1111/j.1539-6924.1992.tb00715.x PG 1 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA KD447 UT WOS:A1992KD44700014 ER PT J AU MOSKOWITZ, PD PARDI, R DEPHILLIPS, MP MEINHOLD, AF AF MOSKOWITZ, PD PARDI, R DEPHILLIPS, MP MEINHOLD, AF TI COMPUTER-MODELS USED TO SUPPORT CLEANUP DECISION-MAKING AT HAZARDOUS AND RADIOACTIVE-WASTE SITES SO RISK ANALYSIS LA English DT Review DE COMPUTER MODELS; CLEANUP DECISION-MAKING; HAZARDOUS WASTES; RADIOACTIVE WASTES ID TRANSPORT; FLOW AB Massive efforts are underway to clean up hazardous and radioactive waste sites located throughout the United States. To help determine cleanup priorities, computer models are being used to characterize the source, transport, fate, and effects of hazardous chemicals and radioactive materials found at these sites. Although the U.S. Environmental Protection Agency (EPA), the U.S. Department of Energy (DOE), and the U.S. Nuclear Regulatory Commission (NRC) have provided preliminary guidance to promote the use of computer models for remediation purposes, no agency has produced directed guidance on models that must be used in these efforts. As a result, model selection is currently done on an ad hoc basis. This is administratively ineffective and costly, and can also result in technically inconsistent decision-making. To identify what models are actually being used to support decision-making at hazardous and radioactive waste sites, a project jointly funded by EPA, DOE, and NRC was initiated. The purpose of this project was to: (1) identify models being used for hazardous and radioactive waste site assessment purposes; and (2) describe and classify these models. This report presents the results of this study. A mail survey was conducted to identify models in use. The survey was sent to approximately 550 persons engaged in the cleanup of hazardous and radioactive waste sites; 87 individuals responded. They represented organizations including federal agencies, national laboratories, and contractor organizations. The respondents identified 127 computer models that were being used to help support cleanup decision-making. There were a few models that appeared to be used across a large number of sites (e.g., RESRAD). In contrast, the survey results also suggested that most sites were using models which were not reported in use elsewhere. Information is presented on the types of models being used and the characteristics of the models in use. Also shown is a list of models available, but not identified in the survey itself. RP MOSKOWITZ, PD (reprint author), BROOKHAVEN NATL LAB,BIOMED & ENVIRONM ASSESSMENT GRP,UPTON,NY 11973, USA. NR 211 TC 1 Z9 1 U1 0 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4332 J9 RISK ANAL JI Risk Anal. PD DEC PY 1992 VL 12 IS 4 BP 591 EP 621 DI 10.1111/j.1539-6924.1992.tb00716.x PG 31 WC Public, Environmental & Occupational Health; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Public, Environmental & Occupational Health; Mathematics; Mathematical Methods In Social Sciences GA KD447 UT WOS:A1992KD44700015 ER PT J AU THUNDAT, T ZHENG, XY SHARP, SL ALLISON, DP WARMACK, RJ JOY, DC FERRELL, TL AF THUNDAT, T ZHENG, XY SHARP, SL ALLISON, DP WARMACK, RJ JOY, DC FERRELL, TL TI CALIBRATION OF ATOMIC FORCE MICROSCOPE TIPS USING BIOMOLECULES SO SCANNING MICROSCOPY LA English DT Article DE ATOMIC FORCE MICROSCOPY; VIRUS; TIP; DEOXYRIBONUCLEIC ACID; BACTERIOPHAGE; MATHEMATICAL MODELS AB Atomic force microscope (AFM) images of surfaces and samples mounted on substrates are subject to artifacts such as broadening of structures and ghost images of tips due to the finite size and shape of the contacting probe. Therefore, knowledge of the radius of the AFM probe tip is essential for the interpretation of images. We have deduced the shape of the AFM tip by imaging cylindrical biological molecules of various diameters such as deoxyribonucleic acid (DNA), tobacco mosaic virus (TMV), tobacco etch virus (TEV) and bacteriophage M-13 (M-13). Using a paraboloidal tip model and numerically solving equations of contact, the curvatures of the tip and lithographically sharpened tip were ascertained. C1 OAK RIDGE NATL LAB,HTML,OAK RIDGE,TN 37831. UNIV TENNESSEE,KNOXVILLE,TN 37996. RP THUNDAT, T (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,POB 2008,OAK RIDGE,TN 37831, USA. NR 15 TC 86 Z9 87 U1 3 U2 12 PU SCANNING MICROSCOPY INT PI CHICAGO PA PO BOX 66507, AMF O'HARE, CHICAGO, IL 60666 SN 0891-7035 J9 SCANNING MICROSCOPY JI Scanning Microsc. PD DEC PY 1992 VL 6 IS 4 BP 903 EP 910 PG 8 WC Microscopy SC Microscopy GA KK548 UT WOS:A1992KK54800003 ER PT J AU THUNDAT, T ALLISON, DP WARMACK, RJ BROWN, GM JACOBSON, KB SCHRICK, JJ FERRELL, TL AF THUNDAT, T ALLISON, DP WARMACK, RJ BROWN, GM JACOBSON, KB SCHRICK, JJ FERRELL, TL TI ATOMIC FORCE MICROSCOPY OF DNA ON MICA AND CHEMICALLY MODIFIED MICA SO SCANNING MICROSCOPY LA English DT Article DE ATOMIC FORCE MICROSCOPY; MICA; DEOXYRIBONUCLEIC ACID; CHEMICAL TREATMENT; BIOMOLECULES ID SCANNING TUNNELING MICROSCOPY; NUCLEIC-ACIDS; SURFACE; IMAGES; WATER AB Atomic force microscopy (AFM) was used to image circular DNA adsorbed on freshly cleaved mica and mica chemically modified with Mg(II), Co(II), La(III), and Zr(IV). Images obtained on unmodified mica show coiling of DNA due to forces involved during the drying process. The coiling or super twisting appeared to be right handed and the extent of super twisting could be controlled by the drying conditions. Images of DNA observed on chemically modified surfaces show isolated open circular DNA that is free from super twisting, presumably due to strong binding of DNA on chemically modified surfaces. C1 UNIV TENNESSEE,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,HTML,OAK RIDGE,TN 37831. RP THUNDAT, T (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,POB 2008,OAK RIDGE,TN 37831, USA. NR 27 TC 81 Z9 82 U1 1 U2 16 PU SCANNING MICROSCOPY INT PI CHICAGO PA PO BOX 66507, AMF O'HARE, CHICAGO, IL 60666 SN 0891-7035 J9 SCANNING MICROSCOPY JI Scanning Microsc. PD DEC PY 1992 VL 6 IS 4 BP 911 EP 918 PG 8 WC Microscopy SC Microscopy GA KK548 UT WOS:A1992KK54800004 PM 1295085 ER PT J AU CHEN, SR KOCKS, UF AF CHEN, SR KOCKS, UF TI ON THE STRAIN-RATE DEPENDENCE OF DYNAMIC RECRYSTALLIZATION IN COPPER POLYCRYSTALS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP CHEN, SR (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,MAIL STOP K765,LOS ALAMOS,NM 87545, USA. RI Kocks, Fred/E-1159-2011 NR 9 TC 25 Z9 25 U1 1 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 DEC 1 PY 1992 VL 27 IS 11 BP 1587 EP 1592 DI 10.1016/0956-716X(92)90149-9 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JX702 UT WOS:A1992JX70200026 ER PT J AU MORLET, AC LORENZ, J AF MORLET, AC LORENZ, J TI NUMERICAL-SOLUTION OF A FUNCTIONAL-EQUATION ON A CIRCLE SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE CIRCLE MAP; CUBIC SPLINE; INVARIANT CURVE; POINCARE MAP; VANDERPOL OSCILLATOR AB In this article, two numerical methods are analyzed and applied to compute an invariant closed curve for a particular class of maps: a second-order scheme based on linear interpolation and a scheme based on interpolation by cubic splines. In suitable coordinates, the invariant curve is determined by the solution of a functional equation on a circle. A linearized version of this functional equation is studied in detail. Stability of the schemes is discussed and error estimates are derived depending on the smoothness of the solution. Roughly speaking, the analysis predicts superior behavior of the spline scheme when the solution is sufficiently smooth, but a more reliable behavior of the lower-order scheme in situations when a smooth solution cannot be expected. This is confirmed in numerical examples. The analysis of the linear functional equation does not readily generalize to nonlinear equations, but the algorithms for the linear equation can be used as a building block for a treatment of nonlinear equations. This is demonstrated in the last section where an invariant closed curve of the Poincare map is computed for the periodically forced van der Pol oscillator. The formal Newton iteration in function space is discretized by the spline interpolation scheme. C1 UNIV NEW MEXICO,DEPT MATH & STAT,ALBUQUERQUE,NM 87131. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,DIV COMP & COMMUN,LOS ALAMOS,NM 87545. NR 13 TC 3 Z9 3 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD DEC PY 1992 VL 29 IS 6 BP 1741 EP 1768 DI 10.1137/0729098 PG 28 WC Mathematics, Applied SC Mathematics GA KA967 UT WOS:A1992KA96700012 ER PT J AU PENNISI, A SIMONE, F LAMPERT, CM AF PENNISI, A SIMONE, F LAMPERT, CM TI ELECTROCHROMIC PROPERTIES OF TUNGSTEN MOLYBDENUM OXIDE ELECTRODES SO SOLAR ENERGY MATERIALS AND SOLAR CELLS LA English DT Article ID THIN-FILMS; DEVICES AB Tungsten oxide and molybdenum doped tungsten oxide electrochromic films have been electrochemically prepared from a metal peroxide bath and experimentally tested. They were characterized by electrical and optical methods, using cyclic voltammograms and calculating the charge capacity as a function of the number of deposition cycles. The color of the electroChromic WO3 film is strongly altered by doping it with molybdenum. Electrochromic W-Mo oxide films were fabricated by adding different percentages of molybdenum to tungsten oxide, ranging from 0.5% to 7% weight of deposition solution. Normal optical transmittance was also measured and evidence is given of different behavior of the switching for oxidation and reduction cycle, so that coloration occurs in a shorter time than the bleaching. The time constant of the process tends to increase as a function of the molybdenum oxide doping concentration. C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,BLDG TECHNOL PROGRAM,BERKELEY,CA 94720. RP PENNISI, A (reprint author), UNIV CATANIA,DIPARTIMENTO FIS,CNR,GRP NAZL STRUTTURA MAT,CORSO ITALIA 57,I-95129 CATANIA,ITALY. NR 19 TC 35 Z9 35 U1 0 U2 16 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0927-0248 J9 SOL ENERG MAT SOL C JI Sol. Energy Mater. Sol. Cells PD DEC PY 1992 VL 28 IS 3 BP 233 EP 247 DI 10.1016/0927-0248(92)90032-K PG 15 WC Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied SC Energy & Fuels; Materials Science; Physics GA KG745 UT WOS:A1992KG74500005 ER PT J AU HUANG, XZ SAXENA, A BISHOP, AR WORL, LA LOVE, SP SWANSON, BI AF HUANG, XZ SAXENA, A BISHOP, AR WORL, LA LOVE, SP SWANSON, BI TI SEGMENT LENGTH DEPENDENCE OF RAMAN FREQUENCY AND OPTICAL-PROPERTIES IN MIXED-HALIDE PTCLXBR1-X CHAIN SOLIDS SO SOLID STATE COMMUNICATIONS LA English DT Article ID VALENCE PLATINUM COMPLEXES; SPECTRA; 4; CRYSTALS; DEFECTS AB A systematic spectroscopic study of the mixed-halide MX system PtClxBr1-x reveals a rich and complex resonance Raman spectra dominated by a series of lines which lie between the fundamental symmetric strech (nu1) chain phonon modes of the two constituent pure PtX materials. Each one of these lines comes into resonance at successively different excitation energies. The excitation profiles and observed features (localized phonon modes and fine structure) are accurately predicted to arise from PtBr segments of varying lengths in a PtCl chain within a discrete, 3/4-filled, two-band, tight-binding, extended Peierls-Hubbard model. C1 LOS ALAMOS NATL LAB,SPECT GRP,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES & MAT SCI,LOS ALAMOS,NM 87545. RP HUANG, XZ (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 20 TC 13 Z9 14 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD DEC PY 1992 VL 84 IS 10 BP 957 EP 961 DI 10.1016/0038-1098(92)90801-F PG 5 WC Physics, Condensed Matter SC Physics GA KD156 UT WOS:A1992KD15600008 ER PT J AU ARRINGTON, CA UNKEFER, CJ DONOHOE, RJ HUCKETT, SC KURITA, S SWANSON, BI AF ARRINGTON, CA UNKEFER, CJ DONOHOE, RJ HUCKETT, SC KURITA, S SWANSON, BI TI ON THE ORIGIN OF THE HYPERFINE-STRUCTURE IN THE PHOTOINDUCED EPR-SPECTRUM OF [PT(EN)2][PT(EN)2CL2](CLO4)4 SO SOLID STATE COMMUNICATIONS LA English DT Article ID COMPLEXES; ELECTRON; ASYMMETRY; STATES; ESR AB The nitrogen isotope dependence of the EPR spectrum of the photoinduced paramagnetic defects in the halide-bridged platinum linear chain complex [Pt(en)2][Pt(en)2Cl2](ClO4)4 (en = ethylenediamine) has been studied in order to clarify the origin of the 16G hyperfine structure which is superimposed on the 180 G hyperfine pattern due to two equivalent Pt nuclei. An earlier study attributed the 16 G pattern to the equatorial chelating nitrogens: however, we find that the EPR spectrum obtained for the N-15-substituted species is identical to that obtained for the normal isotopic species, demonstrating that these off-axis nitrogens are not the origin of this splitting. On the basis of this observation and simulations of the EPR spectrum, we attribute the 16G hyperfine pattern to coupling with three or more chlorine nuclei on the chain axis. The origin of the photoinduced paramagnetic defect in PtCl, whether polaronic or neutral kink soliton, is discussed in view of this new data. These results clearly demonstrate the importance of including halide orbitals in many-body models of the quasi-one-dimensional MX chain solids. C1 LOS ALAMOS NATL LAB,INORGAN & STRUCT CHEM GRP,INC 4,MC C345,LOS ALAMOS,NM 87545. NR 23 TC 4 Z9 4 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD DEC PY 1992 VL 84 IS 10 BP 979 EP 984 DI 10.1016/0038-1098(92)90806-K PG 6 WC Physics, Condensed Matter SC Physics GA KD156 UT WOS:A1992KD15600013 ER PT J AU Sun, BQ Baltisberger, JH Wu, Y Samoson, A Pines, A AF Sun, B. Q. Baltisberger, J. H. Wu, Y. Samoson, A. Pines, A. TI Sidebands in dynamic angle spinning (DAS) and double rotation (DOR) NMR SO SOLID STATE NUCLEAR MAGNETIC RESONANCE LA English DT Article DE dynamic-angle spinning; double rotation; spinning sidebands; quadrupolar nuclei; central transition AB A theory of dynamic angle spinning (DAS) and double rotation (DOR) NMR is described using average Hamiltonian and irreducible tensor methods. Sideband intensities in DAS and DOR spectra are analyzed by both the moment and Bessel function methods, and general formulae are derived. Results show that the DAS moments depend on the relative rotor phase between the first and the second evolution periods, whereas the second and third DOR moments are independent of the relative phase between the inner and outer rotors. Sideband intensities in DAS spectra also depend on the relative rotor phases between evolution at the first and second angles, as well as on the ratio of time spent at each angle. Sideband intensities and phases in DOR spectra are related to the relative rotor phases between the inner and outer rotors, and the sideband pattern is determined by the ratio of the inner and outer rotor spinning speeds. An inversion symmetry of the odd numbered DOR sidebands at the relative rotor phase gamma(r) = 0 degrees. 180 degrees permits the elimination of these sidebands. Finally, numerical simulations are implemented and shown to agree with experimental results. Quadrupolar parameters can therefore be recovered either by calculating the second and third moments or by simulating the sideband intensities and phases. C1 [Pines, A.] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. Univ Calif Berkeley, Lawrence Berkeley Natl Lab, Div Mat & Chem Sci, Berkeley, CA 94720 USA. RP Pines, A (reprint author), Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA. OI Samoson, Ago/0000-0001-7757-6356 FU Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division of the U.S. Department of Energy [DE-AC03-76SF00098]; N.S.F. FX This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division of the U.S. Department of Energy, under Contract no. DE-AC03-76SF00098. J.H.B. acknowledges support from the N.S.F. NR 29 TC 63 Z9 63 U1 1 U2 14 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0926-2040 J9 SOLID STATE NUCL MAG JI Solid State Nucl. Magn. Reson. PD DEC PY 1992 VL 1 IS 5 BP 267 EP 295 DI 10.1016/0926-2040(92)90047-D PG 29 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy SC Chemistry; Physics; Spectroscopy GA V26HT UT WOS:000208537400006 PM 1365742 ER PT J AU MAZAIKA, R KRAUSMAN, PR ETCHBERGER, RC AF MAZAIKA, R KRAUSMAN, PR ETCHBERGER, RC TI FORAGE AVAILABILITY FOR MOUNTAIN SHEEP IN PUSCH RIDGE WILDERNESS, ARIZONA SO SOUTHWESTERN NATURALIST LA English DT Article AB We estimated seasonal forage availability and quality for mountain sheep (Ovis canadensis mexicana) in Pusch Ridge Wilderness (PRW), Santa Catalina Mountains, Arizona. We measured available forage in PRW with a double sampling technique and measured consumption of forage by two captive mountain sheep. Mountain sheep were not limited by forage quantity or quality in PRW in 1987 to 1988. Forage availability was greater for April to September than for October to March. Habitat management for mountain sheep in PRW should concentrate on factors other than the availability or quality of forage. RP MAZAIKA, R (reprint author), PACIFIC NW LAB, BATTELLE BLVD, POB 999, RICHLAND, WA 99352 USA. NR 0 TC 10 Z9 10 U1 0 U2 0 PU SOUTHWESTERN ASSN NATURALISTS PI SAN MARCOS PA SOUTHWEST TEXAS STATE UNIV, DEPT BIOLOGY, 601 UNIVERSITY DR, SAN MARCOS, TX 78666 SN 0038-4909 J9 SOUTHWEST NAT JI Southw. Natural. PD DEC PY 1992 VL 37 IS 4 BP 372 EP 378 DI 10.2307/3671788 PG 7 WC Biodiversity Conservation; Ecology SC Biodiversity & Conservation; Environmental Sciences & Ecology GA KJ699 UT WOS:A1992KJ69900006 ER PT J AU FORBES, JG GELLMAN, AJ DUNPHY, JC SALMERON, M AF FORBES, JG GELLMAN, AJ DUNPHY, JC SALMERON, M TI IMAGING OF SULFUR OVERLAYER STRUCTURES ON THE PD(111) SURFACE SO SURFACE SCIENCE LA English DT Article ID CHEMISORPTION; PALLADIUM; GROWTH; LEED; PD AB We have obtained atomic resolution STM images of both the (square-root 3 x square-root 3)R30-degrees and the (square-root 7 x square-root 7)R19-degrees sulfur overlayer lattices formed on the Pd(111) surface. The images of the (square-root 3 x square-root 3)R30-degrees overlayer are very simple and are consistent with the structure previously determined from LEED analysis. The images of the (square-root 7 x square-root 7)R19-degrees structure on the other hand are surprisingly complex. Within the unit cell which contains ten atoms (seven Pd and three S atoms) we are able to resolve seven atomic scale features. We are faced with the problem of determining which are Pd and which are S. On the basis of comparison of the positions of features in the images with positions of atoms in the Pd(111) surface we propose that two of the sulfur atoms have become incorporated into the subsurface exposing four Pd atoms. C1 UNIV ILLINOIS,DEPT CHEM,URBANA,IL 61801. LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RI Gellman, Andrew/M-2487-2014 OI Gellman, Andrew/0000-0001-6618-7427 NR 21 TC 42 Z9 42 U1 0 U2 6 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 68 EP 78 DI 10.1016/0039-6028(92)90742-O PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA KA768 UT WOS:A1992KA76800014 ER PT J AU BADER, SD AF BADER, SD TI MAGNETOOPTICAL STUDIES OF ULTRA-THIN FERROMAGNETIC-FILMS SO ULTRAMICROSCOPY LA English DT Article ID TRANSITION-METAL MONOLAYERS; EPITAXIAL FE FILMS; SURFACE-ANISOTROPY; IRON FILMS; MAGNETOCRYSTALLINE ANISOTROPY; NANOSCALE MULTILAYERS; PHASE-TRANSITION; CU(100); INTERFACE; SUPERLATTICES AB Recent developments are reviewed in the general area of surface magnetic anisotropy of ultra-thin ferromagnetic films of 3d transition metals. The surface magneto-optic Kerr effect (SMOKE) is introduced as a probe of magnetic anisotropy effects in ultra-thin ferromagnetic films. SMOKE results from the author's laboratory are highlighted, including the study of the stabilization of vertical easy axes of magnetization in a variety of epitaxial Fe film systems. RP BADER, SD (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 68 TC 1 Z9 1 U1 0 U2 2 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 355 EP 360 DI 10.1016/0304-3991(92)90165-G PG 6 WC Microscopy SC Microscopy GA KG292 UT WOS:A1992KG29200008 ER PT J AU HUTTEN, A THOMAS, G AF HUTTEN, A THOMAS, G TI MICROSTRUCTURAL PARAMETERS OF MELT-SPUN ND15FE77B8 RIBBONS SO ULTRAMICROSCOPY LA English DT Article ID PERMANENT-MAGNETS; NDFEB-MAGNETS; ND; FE; FIELD AB The combination of electron microscopy and field ion microscopy has been used to evaluate microstructural parameters such as phase relations, phase distributions, grain-size distribution, grain morphology and chemical composition of interfaces in melt-spun ribbons of Nd15Fe77B8. Subsequently, the data obtained has been used to interpret the magnetization behavior in this material. Finally, the role played by microstructural features during magnetization reversal has been discussed in terms of pinning and nucleation. C1 LAWRENCE BERKELEY LAB,NATL CTR ELECTRON MICROSCOPY,BERKELEY,CA 94720. RP HUTTEN, A (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. RI Hutten, Andreas/B-3524-2011 NR 17 TC 5 Z9 5 U1 0 U2 4 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 447 EP 454 DI 10.1016/0304-3991(92)90176-K PG 8 WC Microscopy SC Microscopy GA KG292 UT WOS:A1992KG29200019 ER PT J AU REUBEL, GH GEORGE, JW BARLOUGH, JE HIGGINS, J GRANT, CK PEDERSEN, NC AF REUBEL, GH GEORGE, JW BARLOUGH, JE HIGGINS, J GRANT, CK PEDERSEN, NC TI INTERACTION OF ACUTE FELINE HERPESVIRUS-1 AND CHRONIC FELINE IMMUNODEFICIENCY VIRUS-INFECTIONS IN EXPERIMENTALLY INFECTED SPECIFIC PATHOGEN FREE CATS SO VETERINARY IMMUNOLOGY AND IMMUNOPATHOLOGY LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL CONF OF FELINE IMMUNODEFICIENCY VIRUS RESEARCHERS CY SEP 04-07, 1991 CL UNIV CALIFORNIA DAVIS, DAVIS, CA SP UNIVERSITYWIDE CALIF AIDS RES PROGRAM, IDEXX, SMITHKLINE BEECHAM, ANIM HLTH, RHONE MERIEUX LABS, BURROUGHS WELLCOME HO UNIV CALIFORNIA DAVIS ID T-CELLS; VIRAL RHINOTRACHEITIS; INACTIVATED VACCINE; IMMUNE DYSFUNCTION; HIV-DISEASE; TYPE-1; AIDS; RESPONSES; ABNORMALITIES; HEMOPHILIACS AB Cats with or without chronic feline immunodeficiency virus (FIV) infection were exposed to feline herpesvirus, type 1 (FHV-1). FIV infected cats became sicker than non-FIV infected cats and required more supportive treatment. However, there were no differences in the length of their illness or in the levels and duration of FHV-1 shedding. FHV-1 infection caused a transient neutrophilia at Day 7 with a rapid return to preinfection levels. The neutrophilia coincided with a transient lymphopenia that was accompanied by a decline in both CD4+ and CD8+ T-lymphocytes. A brief decrease in the CD4+/CD8+ T-lymphocyte ratio occurred at Day 14 in both FIV infected and non-infected cats. This decrease was mainly the result of an absolute and transient increase in CD8+ T-lymphocytes. CD4+ and CD8+ T-lymphocyte numbers and CD4+/CD+ T-lymphocyte ratios returned to baseline within 4-8 weeks in both FIV infected and non-infected cats. FIV infected cats produced less FHV-1 neutralizing antibodies during the first 3 weeks of infection than non-FIV infected animals. The IgM FHV-1 antibody response was depressed in FIV infected cats whereas the IgG antibody response was unaffected. FHV-1 infection evoked a comparable transient loss of lymphocyte blastogenic responses to concanavalin A and pokeweed mitogen in both FIV infected and non-infected cats. However, response to pokeweed mitogen took longer to return to normal in FIV infected animals. Lymphocytes from FIV infected cats had a greater and more sustained proliferative response to FHV-1 antigen than non-FIV infected cats. The ongoing IgG antibody response to FIV was not affected by FHV-1 infection. C1 PACIFIC NW LAB, DEPT IMMUNOL & RETROVIRUS RES, RICHLAND, WA 99352 USA. RP REUBEL, GH (reprint author), UNIV CALIF DAVIS, SCH VET MED, DEPT MED, DAVIS, CA 95616 USA. FU NCI NIH HHS [CA-50179-03]; PHS HHS [2RO1 A1-26120-04, A1-25802-05] NR 45 TC 24 Z9 25 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2427 J9 VET IMMUNOL IMMUNOP JI Vet. Immunol. Immunopathol. PD DEC PY 1992 VL 35 IS 1-2 BP 95 EP 119 DI 10.1016/0165-2427(92)90124-9 PG 25 WC Immunology; Veterinary Sciences SC Immunology; Veterinary Sciences GA KC981 UT WOS:A1992KC98100010 PM 1363011 ER PT J AU WANG, BQ GENG, GQ LEVY, AV AF WANG, BQ GENG, GQ LEVY, AV TI THE RELATIONSHIP BETWEEN EROSION-CORROSION METAL WASTAGE AND TEMPERATURE SO WEAR LA English DT Article ID STEELS AB A series of erosion-corrosion (E-C) tests was carried out using 180 mum, angular Al2O3 on 1018, 2.25Cr-1Mo and 2.5Cr-0.55Mo-1.4Si steels (where the compositions are in approximate weight per cent) at different temperatures from 150 to 650-degrees-C at a particle velocity of 2.5 m s-1 which occurs at in-bed locations of bubbling fluidized-bed combustors (BFBCs). Two different relationships between E-C metal wastage and temperature were determined. For the 1018 and 2.25Cr-1Mo steels a peak in the temperature-metal wastage curves occurred at 350-degrees-C. However, for 2.5Cr-0.55-Mo-1.4Si steel below 450-degrees-C the metal wastage was relatively high and constant. Above 450-degrees-C the metal wastage markedly decreased with increasing test temperature. This behavior has been observed on in-bed tubes in BFBCs but has never before been duplicated in laboratory tests. It was found that, in addition to the particle velocity, the corrosion (oxidation) resistance of steels influenced the relationship between metal wastage and test temperature; this is explained in terms of the ductility of the scale that occurred. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WANG, BQ (reprint author), XIAN INST HIGHWAYS,XIAN,SHAANXI,PEOPLES R CHINA. NR 16 TC 16 Z9 18 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD DEC 1 PY 1992 VL 159 IS 2 BP 233 EP 239 DI 10.1016/0043-1648(92)90306-S PG 7 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA KD617 UT WOS:A1992KD61700009 ER PT J AU MAUPIN, HE WILSON, RD HAWK, JA AF MAUPIN, HE WILSON, RD HAWK, JA TI AN ABRASIVE WEAR STUDY OF ORDERED FE3AL SO WEAR LA English DT Article AB Abrasive wear research has been conducted on ordered iron aluminide intermetallics. Pin-on-drum abrasive wear tests were performed on samples of varying long-range order. Wear surfaces were examined with optical microscopy, transmission electron microscopy (TEM), scanning electron microscopy and X-ray diffraction. The wear mechanism consisted of microplowing, micromachining and microfracture. Compositional variation near Fe3Al and the degree of long-range ordering had only minor effects on the abrasive wear rates of iron aluminide samples. TEM analysis of the wear surfaces indicated that significant plastic deformation and recrystallization had occurred. The abrasive wear rates were compared with those of well-known abrasive wear-resistant materials. RP MAUPIN, HE (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 20 TC 24 Z9 31 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD DEC 1 PY 1992 VL 159 IS 2 BP 241 EP 247 DI 10.1016/0043-1648(92)90307-T PG 7 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA KD617 UT WOS:A1992KD61700010 ER PT J AU EBERHARDT, LL PITCHER, KW AF EBERHARDT, LL PITCHER, KW TI A FURTHER ANALYSIS OF THE NELCHINA CARIBOU AND WOLF DATA SO WILDLIFE SOCIETY BULLETIN LA English DT Article ID HERD CASE-HISTORY; PREDATION C1 ALASKA DEPT FISH & GAME, ANCHORAGE, AK 99502 USA. RP EBERHARDT, LL (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 15 TC 14 Z9 14 U1 0 U2 0 PU WILDLIFE SOC PI BETHESDA PA 5410 GROSVENOR LANE, BETHESDA, MD 20814-2197 SN 0091-7648 J9 WILDLIFE SOC B JI Wildl. Soc. Bull. PD WIN PY 1992 VL 20 IS 4 BP 385 EP 395 PG 11 WC Biodiversity Conservation SC Biodiversity & Conservation GA KG580 UT WOS:A1992KG58000005 ER PT J AU RUOSO, G CAMERON, R CANTATORE, G MELISSINOS, AC SEMERTZIDIS, Y HALAMA, HJ LAZARUS, DM PRODELL, AG NEZRICK, F RIZZO, C ZAVATTINI, E AF RUOSO, G CAMERON, R CANTATORE, G MELISSINOS, AC SEMERTZIDIS, Y HALAMA, HJ LAZARUS, DM PRODELL, AG NEZRICK, F RIZZO, C ZAVATTINI, E TI SEARCH FOR PHOTON REGENERATION IN A MAGNETIC-FIELD SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID COSMIC AXIONS; LIGHT PSEUDOSCALARS; SINGLE PHOTONS; GAMMA-DECAY; PARTICLES; LIMITS; CONSTANT AB We have searched for the regeneration of photons propagating in a transverse magnetic field. Such an effect would reveal the existence of light scalar or pseudoscalar particles such as the axion that couple to two photons. We obtain for this coupling the limit g(a gamma gamma) < (1.3 x 10(6) GeV)-1, provided the axion mass m(a) less than or similar to 10(-3) eV. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,I-34127 TRIESTE,ITALY. RP RUOSO, G (reprint author), UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627, USA. RI Semertzidis, Yannis K./N-1002-2013; Ruoso, Giuseppe/G-3075-2015 OI Ruoso, Giuseppe/0000-0001-8140-9382 NR 37 TC 70 Z9 70 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD DEC PY 1992 VL 56 IS 4 BP 505 EP 508 DI 10.1007/BF01474722 PG 4 WC Physics, Particles & Fields SC Physics GA KD071 UT WOS:A1992KD07100001 ER PT J AU ADAMOVICH, MI AGGARWAL, MM ALEXANDROV, YA ANDREEVA, NP ANSON, ZV ARORA, R AVETYAN, FA BADYAL, SK BASOVA, E BHALLA, KB BHASIN, A BHATIA, VS BOGDANOV, VG BUBNOV, VI BURNETT, TH CAI, X CHASNIKOV, IY CHERNOVA, LP CHERNYAVSKY, MM ELIGBAEVA, GZ EREMENKO, LE GAITINOV, AS GANSSAUGE, ER GARPMAN, S GERASSIMOV, SG GROTE, J GULAMOV, KG GUPTA, SK GUPTA, VK HECKMAN, HH HUANG, H JAKOBSSON, B JUDEK, B JUST, L KACHROO, S KALYACHKINA, GS KANYGINA, EK KARABOVA, M KAUL, GL KITROO, S KHARLAMOV, SP KRASNOV, SA KULIKOVA, S KUMAR, V LAL, P LARIONOVA, VG LEPETAN, VN LIU, LS LOKANATHAN, S LORD, J LUKICHEVA, NS LUO, SB MAKSIMKINA, TN MANGOTRA, LK MARUTYAN, NA MASLENNIKOVA, NV MITTRA, IS MOOKERJEE, S NASRULAEVA, H NASYROV, SH NAVOTNY, VS NYSTRAND, J ORLOVA, GI OTTERLUND, I PALSANIA, HS PERESADKO, NG PETROV, NV PLYUSHCHEV, VA QARSHIEV, DA QIAN, WY QIN, YM RANIWALA, R RANIWALA, S RAO, NK RAPPOPORT, VM RHEE, JT SAIDKHANOV, N SALMANOVA, NA SARKISOVA, LG SARKISYAN, VR SHABRATOVA, GS SHAKHOVA, TI SHPILEV, SN SKELDING, D SODERSTROM, K SOLOVJEVA, ZI STENLUND, E SURIN, EL SVECHNIKOVA, LN TOLSTOV, KD TOTHOVA, M TRETYAKOVA, MI TROFIMOVA, TP TULEEVA, U VOKAL, S WANG, HQ WENG, ZQ WILKES, RJ XIA, YL XU, GF ZHANG, DH ZHENG, PY ZHOCHOVA, SI ZHOU, DC AF ADAMOVICH, MI AGGARWAL, MM ALEXANDROV, YA ANDREEVA, NP ANSON, ZV ARORA, R AVETYAN, FA BADYAL, SK BASOVA, E BHALLA, KB BHASIN, A BHATIA, VS BOGDANOV, VG BUBNOV, VI BURNETT, TH CAI, X CHASNIKOV, IY CHERNOVA, LP CHERNYAVSKY, MM ELIGBAEVA, GZ EREMENKO, LE GAITINOV, AS GANSSAUGE, ER GARPMAN, S GERASSIMOV, SG GROTE, J GULAMOV, KG GUPTA, SK GUPTA, VK HECKMAN, HH HUANG, H JAKOBSSON, B JUDEK, B JUST, L KACHROO, S KALYACHKINA, GS KANYGINA, EK KARABOVA, M KAUL, GL KITROO, S KHARLAMOV, SP KRASNOV, SA KULIKOVA, S KUMAR, V LAL, P LARIONOVA, VG LEPETAN, VN LIU, LS LOKANATHAN, S LORD, J LUKICHEVA, NS LUO, SB MAKSIMKINA, TN MANGOTRA, LK MARUTYAN, NA MASLENNIKOVA, NV MITTRA, IS MOOKERJEE, S NASRULAEVA, H NASYROV, SH NAVOTNY, VS NYSTRAND, J ORLOVA, GI OTTERLUND, I PALSANIA, HS PERESADKO, NG PETROV, NV PLYUSHCHEV, VA QARSHIEV, DA QIAN, WY QIN, YM RANIWALA, R RANIWALA, S RAO, NK RAPPOPORT, VM RHEE, JT SAIDKHANOV, N SALMANOVA, NA SARKISOVA, LG SARKISYAN, VR SHABRATOVA, GS SHAKHOVA, TI SHPILEV, SN SKELDING, D SODERSTROM, K SOLOVJEVA, ZI STENLUND, E SURIN, EL SVECHNIKOVA, LN TOLSTOV, KD TOTHOVA, M TRETYAKOVA, MI TROFIMOVA, TP TULEEVA, U VOKAL, S WANG, HQ WENG, ZQ WILKES, RJ XIA, YL XU, GF ZHANG, DH ZHENG, PY ZHOCHOVA, SI ZHOU, DC TI LOCAL PARTICLE DENSITIES AND GLOBAL MULTIPLICITIES IN CENTRAL HEAVY-ION INTERACTIONS AT 3.7, 14.6, 60 AND 200 A-GEV SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID INDUCED EMULSION INTERACTIONS; HIGH-ENERGY COLLISIONS; MULTIPARTICLE PRODUCTION; RAPIDITY DENSITIES; TRANSVERSE ENERGY; DISTRIBUTIONS; FLUCTUATIONS; NUCLEI; FRAGMENTATION; GEV/NUCLEON AB The energy and centrality dependence of local particle pseudorapidity densities as well as validity of various parametrizations of the distributions are examined. The dispersion, sigma, of the rapidity density distribution of produced particles varies slowly with centrality and is 0.80, 0.98, 1.21 and 1.41 for central interactions at 3.7, 14.6, 60 and 200 A GeV incident energy, respectively, sigma is found to be independent of the size of the interacting system at fixed energy. A novel way of representing the window dependence of the multiplicity as normalized variance versus inverse average multiplicity is outlined. C1 ALMA ATA INST HIGH ENERGY PHYS,ALMA ATA,KAZAKHSTAN,USSR. CHINESE ACAD SCI,BEIJING,PEOPLES R CHINA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. PANJAB UNIV,CHANDIGARH 160014,INDIA. HUNAN EDUC INST,CHANGSHA,PEOPLES R CHINA. DUBNA JOINT NUCL RES INST,DUBNA,USSR. UNIV RAJASTHAN,JAIPUR 302004,RAJASTHAN,INDIA. UNIV JAMMU,JAMMU 180001,INDIA. PJ SAFARIKA UNIV,CS-04180 KOSICE,CZECHOSLOVAKIA. SHANXI NORMAL UNIV,LINFEN,PEOPLES R CHINA. UNIV LUND,S-22101 LUND,SWEDEN. UNIV MARBURG,W-3550 MARBURG,GERMANY. NRC,OTTAWA,ONTARIO,CANADA. VG KHLOPIN RADIUM INST,LENINGRAD 197022,USSR. UNIV WASHINGTON,SEATTLE,WA 98195. TASHKENT NUCL PHYS INST,TASHKENT,UZBEKISTAN,USSR. TASHKENT ENGN PHYS INST,TASHKENT,UZBEKISTAN,USSR. WUAZHONG NORMAL UNIV,WUHAN,PEOPLES R CHINA. YEREVAN PHYS INST,YEREVAN,ARMENIA,USSR. RP ADAMOVICH, MI (reprint author), PN LEBEDEV PHYS INST,MOSCOW,USSR. RI Wilkes, R.Jeffrey/E-6011-2013; Gerassimov, Sergei/M-8779-2015; Kharlamov, Sergei/M-9612-2015; Peresadko, Natalia/M-9585-2015; Chernyavsky, Mikhail/H-7909-2014; OI Bhasin, Anju/0000-0002-3687-8179 NR 27 TC 39 Z9 39 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD DEC PY 1992 VL 56 IS 4 BP 509 EP 520 PG 12 WC Physics, Particles & Fields SC Physics GA KD071 UT WOS:A1992KD07100002 ER PT J AU ALBRIGHT, CH AF ALBRIGHT, CH TI NEUTRINO MASSES AND MIXINGS BASED ON A SPECIAL SET OF QUARK MASS MATRICES .2. SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID 17 KEV NEUTRINO; TOP-QUARK; 17-KEV NEUTRINO; INVARIANT FUNCTIONS; WEAK-INTERACTION; LEPTONIC DECAYS; FERMION MASSES; PARTIAL WIDTHS; BETA-SPECTRUM; CP-VIOLATION AB In the framework of a 6 x 6 neutrino mass matrix with the standard seesaw mechanism, simple empirical forms are used for the leptonic Dirac mass submatrices which exhibit hierarchical chiral symmetry-breaking structure with just six parameters, as suggested by our previous work with quark mass matrices. Through a Monte Carlo analysis of Euler angle rotations applied to diagonal forms for the right-handed Majorana mass sub-matrix, we generate scatter plots in the deltam23(2) vs sin2 2theta23 and deltam13(2) vs sin2 2theta13 oscillation planes for a fixed point in the nonadiabatic MSW band. Only a small, statistically insignificant, segment of the 23 mixing plane exists corresponding to depletions of both the solar nu(e) and atmospheric nu(mu) fluxes; however, for such solutions the right-handed Majorana submatrix exhibits a hierarchical chiral symmetry-breaking form remarkably similar to that for the Dirac submatrices. C1 FERMI NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. RP NO ILLINOIS UNIV, DEPT PHYS, DE KALB, IL 60115 USA. NR 72 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD DEC PY 1992 VL 56 IS 4 BP 577 EP 587 DI 10.1007/BF01474731 PG 11 WC Physics, Particles & Fields SC Physics GA KD071 UT WOS:A1992KD07100010 ER PT J AU JAFFKE, T HASHEMI, R CHRISTOPHOROU, LG ILLENBERGER, E AF JAFFKE, T HASHEMI, R CHRISTOPHOROU, LG ILLENBERGER, E TI MECHANISMS OF ANION FORMATION IN O2, O2/AR AND O2/NE CLUSTERS - THE ROLE OF INELASTIC ELECTRON-SCATTERING SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article ID OXYGEN CLUSTERS; ATTACHMENT; ENERGY; EXCITATION; RESONANCES; IMPACT; IONS AB Measurements are reported on the formation of negative ions in O2, O2/Ar and O2/Ne clusters aimed at establishing the mechanisms of anion formation and the role of inelastic electron scattering by the cluster constituents on negative ion formation in clusters. In the case of pure O2 clusters the main anions we detected are of two types: O-(O2)n greater-than-or-equal-to 0 and (O2)n greater-than-or-equal-to 1-. The yields of O-(O2)n showed maxima at 6.3, 8.0 and almost-equal-to 14.0 eV and the data suggest O- as their precursor; the maxima at 8 and almost-equal-to 14 eV are due to the production of O- via symmetry forbidden dissociative attachment processes in O2 at these energies which become allowed in clusters. The yields of (O2)n- showed a strong maximum at near-zero energy (almost-equal-to 0.5 eV) and also at 6.3, 8 and almost-equal-to 14 eV. With the exception of the near-zero energy resonance, the (O2)n- anions at 6.3, 8 and almost-equal-to 14 eV are attributed to nondissociative attachment of near-zero energy "secondary" electrons to O2 clusters. The slow secondary electrons result predominantly from scattering via the O2- negative ion states of incident electrons with energies in their respective regions. Similar results were obtained for the mixed O2/rare gas clusters except that now a feeble and distinctly structured contribution in the yields of O-(O2)n, (O2)n- (and Ar(O2)n-) was observed at energies > 10 eV. These anions are believed to have the lowest negative ion states of Ar*-(Ne*-) as their precursors. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP JAFFKE, T (reprint author), FREE UNIV BERLIN,INST PHYS & THEORET CHEM,W-1000 BERLIN 33,GERMANY. NR 25 TC 18 Z9 18 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 DEC PY 1992 VL 25 IS 1 BP 77 EP 85 PG 9 WC Physics, Atomic, Molecular & Chemical SC Physics GA KB323 UT WOS:A1992KB32300011 ER PT J AU LOVEJOY, ML MELLOCH, MR LUNDSTROM, MS AHRENKIEL, RK AF LOVEJOY, ML MELLOCH, MR LUNDSTROM, MS AHRENKIEL, RK TI MINORITY HOLE MOBILITY IN N+GAAS SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRON; GAAS; SILICON AB The minority hole diffusivity, or equivalently the hole mobility, was measured in n+GaAs with the zero-field time-of-flight technique. The minority hole mobility was measured for the donor doping range of 1.3 X 10(17) cm-3 to 1.8 X 10(18) cm-3 and was found to vary from 235 to 295 cm2/V s. At the lower doping level, the minority hole mobility is comparable to the corresponding majority hole mobility, but at 1.8 X 10(18) cm-3 the minority hole mobility was 30% higher than the majority carrier hole mobility. These results have important implications for the design of devices such as solar cells and pnp-heterojunction bipolar transistors. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. RP LOVEJOY, ML (reprint author), PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907, USA. NR 11 TC 10 Z9 10 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 30 PY 1992 VL 61 IS 22 BP 2683 EP 2684 DI 10.1063/1.108108 PG 2 WC Physics, Applied SC Physics GA JZ892 UT WOS:A1992JZ89200018 ER PT J AU FILIPOVIC, D PAULSEN, MD LOIDA, PJ SLIGAR, SG ORNSTEIN, RL AF FILIPOVIC, D PAULSEN, MD LOIDA, PJ SLIGAR, SG ORNSTEIN, RL TI ETHYLBENZENE HYDROXYLATION BY CYTOCHROME-P450CAM SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID ELECTRON-TRANSFER; CYTOCHROME-P-450CAM; REDUCTION; PUTIDAREDOXIN; OXIDASE; ACID C1 UNIV ILLINOIS, BECKMAN INST, URBANA, IL 61801 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. FU NIGMS NIH HHS [GM31756] NR 23 TC 44 Z9 44 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 30 PY 1992 VL 189 IS 1 BP 488 EP 495 DI 10.1016/0006-291X(92)91584-D PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA KA513 UT WOS:A1992KA51300069 PM 1449498 ER PT J AU WILEY, WR AF WILEY, WR TI INACCURATE DESCRIPTION OF PNL SO CHEMICAL & ENGINEERING NEWS LA English DT Letter C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0009-2347 J9 CHEM ENG NEWS JI Chem. Eng. News PD NOV 30 PY 1992 VL 70 IS 48 BP 5 EP 5 PG 1 WC Chemistry, Multidisciplinary; Engineering, Chemical SC Chemistry; Engineering GA KA128 UT WOS:A1992KA12800003 ER PT J AU BLUME, M AF BLUME, M TI INDUSTRY-GOVERNMENT LABS SO FORTUNE LA English DT Letter RP BLUME, M (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU TIME INC PI NEW YORK PA TIME & LIFE BUILDING ROCKEFELLER CENTER, NEW YORK, NY 10020-1393 SN 0015-8259 J9 FORTUNE JI Fortune PD NOV 30 PY 1992 VL 126 IS 12 BP 38 EP 39 PG 2 WC Business SC Business & Economics GA JX576 UT WOS:A1992JX57600012 ER PT J AU LUTZ, E INGRAFFEA, AR GRAY, LJ AF LUTZ, E INGRAFFEA, AR GRAY, LJ TI USE OF SIMPLE SOLUTIONS FOR BOUNDARY INTEGRAL METHODS IN ELASTICITY AND FRACTURE-ANALYSIS SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article ID ELEMENT METHOD; EQUATIONS AB The 'simple solutions' or 'indirect' method of analysing Cauchy and hypersingular integrands in the gradient (flux or traction) boundary integral equation (BIE) is applied to linear elastic fracture analysis. Because of the geometric singularity of the crack surface, application of the simple solutions formulas on the crack face requires integration over a temporary 'closure surface' rather than the remainder of the body. Closure surface constructions are exhibited for crack surfaces, allowing the gradient BIE to be applied as a constraint equation on a crack surface where the primary BIE is degenerate. Computational results are given for two benchmark fracture problems. C1 CORNELL UNIV,DEPT CIVIL & ENVIRONM ENGN,ITHACA,NY 14850. OAK RIDGE NATL LAB,MATH SCI SECT,OAK RIDGE,TN 37831. NR 31 TC 55 Z9 55 U1 0 U2 4 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD NOV 30 PY 1992 VL 35 IS 9 BP 1737 EP 1751 DI 10.1002/nme.1620350902 PG 15 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA JY518 UT WOS:A1992JY51800001 ER PT J AU MARTHA, LF GRAY, LJ INGRAFFEA, AR AF MARTHA, LF GRAY, LJ INGRAFFEA, AR TI 3-DIMENSIONAL FRACTURE SIMULATION WITH A SINGLE-DOMAIN, DIRECT BOUNDARY ELEMENT FORMULATION SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article ID THIN INTERNAL CAVITIES; INTEGRAL-EQUATIONS; HYPERSINGULAR INTEGRALS; ELASTIC SOLIDS; CRACK PROBLEMS; 3 DIMENSIONS; MECHANICS; REGIONS; FINITE AB An efficient hypersingular boundary integral equation method for three-dimensional fracture mechanics was presented in a previous paper. The details of the numerical implementation of this method are further discussed herein. In particular, an algorithm for achieving the required differentiability of the crack surface displacement function is discussed. To illustrate the utility of the method, computational results for several strongly interacting multiple-crack geometries are presented. The calculated stress intensity factors are in excellent agreement with those obtained by an approximate analytical method due to Kachanov and Laures. RP MARTHA, LF (reprint author), OAK RIDGE NATL LAB,ENGN PHYS & MATH DIV,POB 2008,BLDG 6012,OAK RIDGE,TN 37831, USA. NR 45 TC 23 Z9 23 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD NOV 30 PY 1992 VL 35 IS 9 BP 1907 EP 1921 DI 10.1002/nme.1620350911 PG 15 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA JY518 UT WOS:A1992JY51800010 ER PT J AU DESJARDINS, RL HART, RL MACPHERSON, JI SCHUEPP, PH VERMA, SB AF DESJARDINS, RL HART, RL MACPHERSON, JI SCHUEPP, PH VERMA, SB TI AIRCRAFT-BASED AND TOWER-BASED FLUXES OF CARBON-DIOXIDE, LATENT, AND SENSIBLE HEAT SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID CONVECTIVE BOUNDARY-LAYER; WATER-VAPOR; FIFE AB Fluxes of carbon dioxide, water vapour, and sensible heat obtained over a grassland ecosystem, during the First International Satellite Land Surface Climatology Project (ISLSCP) Field Experiment (FIFE), using an aircraft- and two tower-based systems are compared for several days in 1987 and in 1989. The tower-based cospectral estimates of CO2 (WC), sensible heat (WT), water vapour (Wq), and momentum (WU), expressed as a function of wavenumber K times sampling height z, are relatively similar to the aircraft-based estimates for K x z > 0.1. A measurable contribution to the fluxes is observed by tower-based systems at K x z < 0.01 but not by the aircraft-based system operating at an altitude of approximately 100 m over a 15 x 15 km area. Using all available simultaneous aircraft and tower data, flux estimates by both systems were shown to be highly correlated. As expected from the spatial variations of the greenness index, surface extrapolation of airborne flux estimates tended to lie between those of the two tower sites. The average fluxes obtained, on July 11, 1987, and August 4, 1989, by flying a grid pattern over the FIFE site agreed with the two tower data sets for CO2, but sensible and latent heat were smaller than those obtained by the tower-based systems. However, in general, except for a small underestimation due to the long wavelength contributions and due to flux divergence with height, the differences between the aircraft- and tower-based surface estimates of fluxes appear to be mainly attributable to differences in footprint, that is, differences in the area contributing to the surface flux estimates. C1 ARGONNE NATL LAB, DIV ENVIRONM RES, ARGONNE, IL 60439 USA. NATL RES COUNCIL CANADA, FLIGHT RES LAB, OTTAWA K1A 0R6, ONTARIO, CANADA. MCGILL UNIV, DEPT RENEWABLE RESOURCES, ST ANNE DE BELLEVUE H9X 1C0, QUEBEC, CANADA. UNIV NEBRASKA, DEPT AGR METEOROL, LINCOLN, NE 68508 USA. RP DESJARDINS, RL (reprint author), AGR CANADA, RES BRANCH, CTR LAND & BIOL RESOURCES RES, BLDG 74, OTTAWA K1A 0C6, ONTARIO, CANADA. NR 21 TC 40 Z9 41 U1 1 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 30 PY 1992 VL 97 IS D17 BP 18477 EP 18485 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KC520 UT WOS:A1992KC52000012 ER PT J AU KANEMASU, ET VERMA, SB SMITH, EA FRITSCHEN, LJ WESELY, M FIELD, RT KUSTAS, WP WEAVER, H STEWART, JB GURNEY, R PANIN, G MONCRIEFF, JB AF KANEMASU, ET VERMA, SB SMITH, EA FRITSCHEN, LJ WESELY, M FIELD, RT KUSTAS, WP WEAVER, H STEWART, JB GURNEY, R PANIN, G MONCRIEFF, JB TI SURFACE FLUX MEASUREMENTS IN FIFE - AN OVERVIEW SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ENERGY; RADIATION; BALANCE AB In 1987 the Surface Flux Group of the first ISLSCP Field Experiment (FIFE) operated 22 stations at 20 sites. In 1989, 13 sites were instrumented. A variety of sensors were employed to calculate the fluxes of mass and energy. An effort was made throughout the FIFE campaign to compare sensors. A series of papers in this special issue present these group studies and efforts. These papers principally report the 1987 campaign, although two papers report station intercomparison during 1989. Additional papers examine the time-space variability of heat, moisture, and momentum fluxes, as well as analyses of the properties of the CO2 fluxes and their relationships to water stress. In this overview paper we describe the basic methodologies of the measurements, provide details on the sensor systems used by members of the Surface Flux Group, and provide a summary of the flux articles appearing in this special issue. C1 UNIV NEBRASKA,DEPT AGR METEOROL,LINCOLN,NE 68583. FLORIDA STATE UNIV,DEPT METEOROL,TALLAHASSEE,FL 32307. UNIV WASHINGTON,COLL FOREST RESOURCES,SEATTLE,WA 98195. ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. UNIV DELAWARE,COLL MARINE STUDIES,NEWARK,DE 19717. USDA ARS,BELTSVILLE AGR RES CTR,BELTSVILLE,MD 20705. US GEOL SURVEY,FED CTR,DENVER,CO 80201. UK INST HYDROL,WALLINGFORD,ENGLAND. UNIV READING,READING RG6 2AH,BERKS,ENGLAND. ACAD SCI,INST ATMOSPHER PHYS,MOSCOW,USSR. UNIV EDINBURGH,INST ECOL & RESOURCE MANAGEMENT,EDINBURGH EH8 9YL,MIDLOTHIAN,SCOTLAND. RP KANEMASU, ET (reprint author), UNIV GEORGIA,DEPT AGRON,GRIFFIN,GA 30223, USA. RI Panin, Gennadiy/P-6227-2014 NR 29 TC 84 Z9 86 U1 0 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 30 PY 1992 VL 97 IS D17 BP 18547 EP 18555 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KC520 UT WOS:A1992KC52000018 ER PT J AU SMITH, EA HSU, AY CROSSON, WL FIELD, RT FRITSCHEN, LJ GURNEY, RJ KANEMASU, ET KUSTAS, WP NIE, D SHUTTLEWORTH, WJ STEWART, JB VERMA, SB WEAVER, HL WESELY, ML AF SMITH, EA HSU, AY CROSSON, WL FIELD, RT FRITSCHEN, LJ GURNEY, RJ KANEMASU, ET KUSTAS, WP NIE, D SHUTTLEWORTH, WJ STEWART, JB VERMA, SB WEAVER, HL WESELY, ML TI AREA-AVERAGED SURFACE FLUXES AND THEIR TIME-SPACE VARIABILITY OVER THE FIFE EXPERIMENTAL DOMAIN SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ENERGY BUDGET MICROCLIMATES; DEEP VALLEY RADIATION; BOUNDARY-LAYER; IMPACT; SOIL; EVAPOTRANSPIRATION; CIRCULATIONS; BALANCE; HEAT AB The underlying mean and variance properties of surface net radiation, soil heat flux, and sensible-latent heat fluxes are examined over the densely instrumented grassland region encompassing the First ISLSCP Field Experiment (FIFE). Twenty-two surface flux stations at 20 sites were deployed during the four 1987 intensive field campaigns (IFCs). Flux variability is addressed together with the problem of scaling up to area-averaged fluxes. Successful parameterization of area-averaged fluxes in atmospheric models is based on accounting for internal spatial and temporal scales correctly. Mean and variance properties of fluxes are examined in both daily and diurnally averaged frameworks. Results are compared and contrasted for clear and cloudy situations and checked for the influence of surface-induced biophysical controls (burn and grazing treatments) and topographic controls (slope factors and aspect ratios). Examination of the sensitivity of domain-averaged fluxes to different averaging procedures demonstrates that this may be an important consideration. The results reveal six key features of the 1987 surface fluxes: (1) cloudiness variability and ample rainfall throughout the growing season led to near-consistency in flux magnitudes during the first three IFCs; (2) burn treatment, grazing conditions, and topography have clearly delineated influences on the diurnal cycle flux amplitudes but do not alter the evaporative fraction significantly; (3) cloudiness is the major control on flux variability in terms of both mean and variance properties but has little impact on the Bowen ratio or evaporative fraction; (4) spatial weighting of fluxes based on a biophysical-topographical cross stratification generates a measurable bias with respect to straight arithmetic averaging (up to 20 W m-2 in available heating); (5) structure function analysis demonstrates significant underlying spatial autocorrelation structure in the fluxes, but the observed distance dependence is due to cloudiness controls, not surface controls; (6) Monte Carlo analysis of high resolution vegetation indices obtained from SPOT satellite measurements suggest that the mean domain amplitudes of the diurnal sensible and latent heat flux cycles can be biased up to 30-40 W m-2 by repositioning the 20 site locations within the experimental domain. C1 FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. UNIV DELAWARE, COLL MARINE, NEWARK, DE 19718 USA. UNIV WASHINGTON, COLL FOREST RESOURCES, SEATTLE, WA 98195 USA. UNIV GEORGIA, DEPT AGRON, GRIFFIN, GA 30223 USA. USDA ARS, BELTSVILLE AGR RES CTR, BELTSVILLE, MD 20705 USA. KANSAS STATE UNIV AGR & APPL SCI, EVAPOTRANSPIRAT LAB, MANHATTAN, KS 66506 USA. INST HYDROL, WALLINGFORD OX10 8BB, OXON, ENGLAND. UNIV NEBRASKA, CTR AGR METEOROL & CLIMATOL, LINCOLN, NE 68588 USA. US GEOL SURVEY, DENVER, CO 80225 USA. ARGONNE NATL LAB, DIV ENVIRONM RES, ARGONNE, IL 60439 USA. RP SMITH, EA (reprint author), FLORIDA STATE UNIV, DEPT METEOROL, TALLAHASSEE, FL 32306 USA. NR 45 TC 91 Z9 93 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 30 PY 1992 VL 97 IS D17 BP 18599 EP 18622 PG 24 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KC520 UT WOS:A1992KC52000021 ER PT J AU GAO, W WESELY, ML COOK, DR HART, RL AF GAO, W WESELY, ML COOK, DR HART, RL TI AIR-SURFACE EXCHANGE OF H2O, CO-2, AND O-3 AT A TALLGRASS PRAIRIE IN RELATION TO REMOTELY SENSED VEGETATION INDEXES SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID TEMPERATE GRASSLAND ECOSYSTEM; SPECTRAL REFLECTANCE; STOMATAL CONDUCTANCE; CANOPY REFLECTANCE; PHOTOSYNTHESIS; TRANSPIRATION; DEPOSITION; BALANCE; INDEX; FIELD AB Parameters derived from eddy correlation measurements of the air-surface exchange rates of H2O, CO2, and O3 over a tallgrass prairie are examined in terms of their relationships with spectral reflectance data remotely sensed from aircraft and satellites during the four 1987 intensive field campaigns of the First ISLSCP Field Experiment (FIFE). The surface conductances g(c) were strongly modulated by photosynthetically active radiation received at the surface (K down par) when the grass was green and well watered; mesophyll resistances were large for CO2 but negligible for H2O and O3. Seasonal changes of the surface conductances for a given level of K down par were well correlated with changes in the simple ratio (SR) of canopy reflectances in the red and near-infrared wave bands. A linear relationship in the form of g(c) = G0 + beta(SR - SR0), where SR0 almost-equal-to 2 represents the simple ratio for senescent grass and G0 represents the corresponding nonstomatal conductance, fits the data fairly well and thus supports the results of modeling studies by Sellers (1985, 1987). In this relationship, G0 had values of near zero for H2O and CO2 and about 0.4 cm s-1 for O3. The slope beta for large irradiation was about 0.08 cm s-1 for H2O and O3 and 0.03 cm s-1 for CO2. The inferred nonstomatal conductance had a small seasonal variability in comparison to the total canopy conductance. RP GAO, W (reprint author), ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439, USA. NR 30 TC 20 Z9 20 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 30 PY 1992 VL 97 IS D17 BP 18663 EP 18671 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KC520 UT WOS:A1992KC52000026 ER PT J AU FRITSCHEN, LJ QIAN, P KANEMASU, ET NIE, D SMITH, EA STEWART, JB VERMA, SB WESELY, ML AF FRITSCHEN, LJ QIAN, P KANEMASU, ET NIE, D SMITH, EA STEWART, JB VERMA, SB WESELY, ML TI COMPARISONS OF SURFACE FLUX MEASUREMENT SYSTEMS USED IN FIFE 1989 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article AB Several types of Bowen ratio energy balance and eddy correlation systems were used to estimate sensible and latent heat fluxes during FIFE. To provide information on the ability of these systems to make representative measurements of sensible and latent heat fluxes at individual sites, several systems were compared by operating them side by side. The different Bowen ratio systems produced estimates that were usually in close agreements most of the discrepancies were minor and were due to differing estimates of Rn and G. Comparisons between results of Bowen ratio systems and eddy correlation systems at sites 906 (2133-ECA) and 926 (8739-ECB), however, were less satisfactory. The discrepancies were occasionally large and seemed to vary in complex terrain with local conditions such as wind direction, upwind slope aspect, and solar zenith angle. C1 ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. UNIV GEORGIA,DEPT AGRON,GRIFFIN,GA 30223. KANSAS STATE UNIV AGR & APPL SCI,EVAPOTRANSPIRAT LAB,MANHATTAN,KS 66506. FLORIDA STATE UNIV,DEPT METEOROL,TALLAHASSEE,FL 32306. INST HYDROL,WALLINGFORD OX10 8BB,OXON,ENGLAND. UNIV NEBRASKA,DEPT AGR METEOROL & CLIMATOL,LINCOLN,NE 68588. RP FRITSCHEN, LJ (reprint author), UNIV WASHINGTON,COLL FOREST RESOURCES,SEATTLE,WA 98195, USA. NR 11 TC 44 Z9 45 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-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 30 PY 1992 VL 97 IS D17 BP 18697 EP 18713 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KC520 UT WOS:A1992KC52000029 ER PT J AU MONCRIEFF, JB VERMA, SB COOK, DR AF MONCRIEFF, JB VERMA, SB COOK, DR TI INTERCOMPARISON OF EDDY-CORRELATION CARBON-DIOXIDE SENSORS DURING FIFE 1989 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID SENSIBLE HEAT FLUXES; WATER-VAPOR; CO2 AB An intercomparison was made of the infrared gas analyzers used in the First ISLSCP Field Experiment (FIFE) 1989 to measure surface fluxes of carbon dioxide immediately following intensive field campaign (IFC) 5. Fluxes of CO2 agreed to within 15% when all instruments are compared; when models of the same type of analyzer were compared, the agreement was within 5%. The stability of the calibration coefficients is examined, and it is shown that frequent calibration of the gas analyzers is required. Differences in the physical design of the analyzer models discussed here, such as sampling volume and sensitivity of the electronics to thermal drift, influence the precision of the flux estimates. Spectra and cospectra reveal the degree to which instrumental noise limits the complete sampling of all frequencies of eddies contributing to flux transport. C1 UNIV NEBRASKA,DEPT AGR METEOROL,LINCOLN,NE 68588. ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. RP MONCRIEFF, JB (reprint author), UNIV EDINBURGH,INST ECOL & RESOURCE MANAGEMENT,EDINBURGH EH8 9YL,MIDLOTHIAN,SCOTLAND. NR 15 TC 12 Z9 12 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-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 30 PY 1992 VL 97 IS D17 BP 18725 EP 18730 PG 6 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KC520 UT WOS:A1992KC52000031 ER PT J AU BARGER, V PHILLIPS, RJN WHISNANT, K AF BARGER, V PHILLIPS, RJN WHISNANT, K TI LONG-WAVELENGTH OSCILLATIONS AND THE NEW GALLIUM SOLAR NEUTRINO SIGNALS SO PHYSICAL REVIEW LETTERS LA English DT Article ID MATTER; SPECTROSCOPY AB Long-wavelength vacuum oscillations between neutrinos can explain all the existing results from the chlorine, water-Cherenkov, and new gallium solar neutrino detectors. They predict distinctive energy dependences and seasonal time dependences that can be measured in solar neutrino experiments currently being constructed. C1 RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP BARGER, V (reprint author), UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706, USA. NR 31 TC 70 Z9 70 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 30 PY 1992 VL 69 IS 22 BP 3135 EP 3138 DI 10.1103/PhysRevLett.69.3135 PG 4 WC Physics, Multidisciplinary SC Physics GA JZ676 UT WOS:A1992JZ67600001 ER PT J AU ALVES, GA AMATO, S ANJOS, JC APPEL, JA BRACKER, SB CREMALDI, LM DARLING, CL DIXON, RL ERREDE, D FENKER, HC GAY, C GREEN, DR JEDICKE, R KAPLAN, D KARCHIN, PE KWAN, S LEEDOM, I LUEKING, LH LUSTE, GJ MANTSCH, PM NETO, JRTD METHENY, J MILBURN, RH DEMIRANDA, JM DAMOTTA, H NAPIER, A DOLIVERA, AB RAFATIAN, A DOSREIS, AC REUCROFT, S ROSS, WR SANTORO, AFS SHEAFF, M SOUZA, MHG SPALDING, WJ STOUGHTON, C STREETMAN, ME SUMMERS, DJ TAKACH, SF WU, Z AF ALVES, GA AMATO, S ANJOS, JC APPEL, JA BRACKER, SB CREMALDI, LM DARLING, CL DIXON, RL ERREDE, D FENKER, HC GAY, C GREEN, DR JEDICKE, R KAPLAN, D KARCHIN, PE KWAN, S LEEDOM, I LUEKING, LH LUSTE, GJ MANTSCH, PM NETO, JRTD METHENY, J MILBURN, RH DEMIRANDA, JM DAMOTTA, H NAPIER, A DOLIVERA, AB RAFATIAN, A DOSREIS, AC REUCROFT, S ROSS, WR SANTORO, AFS SHEAFF, M SOUZA, MHG SPALDING, WJ STOUGHTON, C STREETMAN, ME SUMMERS, DJ TAKACH, SF WU, Z TI FEYNMAN-X AND TRANSVERSE-MOMENTUM DEPENDENCE OF D+/- AND D(0),(D)OVER-BAR(0) PRODUCTION IN 250 GEV PI-NUCLEON INTERACTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID D-MESON PRODUCTION; LUND MONTE-CARLO; PP INTERACTIONS; ISR AB We measure the differential cross section with respect to Feynman-x (x(F)) and transverse momentum (P(T)) for charm meson production using targets of Be, Al, Cu, and W. In the range 0.1 < x(F) < 0.7, dsigma/dx(F) is well fit by the form (1 - x(F))n with n = 3.9 +/- 0.3. The difference between n values for D- and D+ is 1.1 +/- 0.7. In the lower P(T) range, < 2 GeV, dsigma/dP(T)2 is well fit by the form exp(-b x P(T)2) with b = 1.03 +/- 0.06 GeV-2, while in the higher PT range, 0.8 to 3.6 GeV, it is well fit by the form exp(-b' x P(T)) with b' = 2.76 +/- 0.08 GeV-1. The shape of the differential cross section has no significant dependence on atomic mass of the target material. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV MISSISSIPPI,OXFORD,MS 38677. NORTHEASTERN UNIV,BOSTON,MA 02115. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06511. RP ALVES, GA (reprint author), CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO JANEIRO,BRAZIL. RI Anjos, Joao/C-8335-2013; Alves, Gilvan/C-4007-2013; de Mello Neto, Joao/C-5822-2013 OI de Mello Neto, Joao/0000-0002-3234-6634 NR 21 TC 37 Z9 37 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 30 PY 1992 VL 69 IS 22 BP 3147 EP 3150 DI 10.1103/PhysRevLett.69.3147 PG 4 WC Physics, Multidisciplinary SC Physics GA JZ676 UT WOS:A1992JZ67600004 ER PT J AU BAKER, GA AF BAKER, GA TI DIMENSIONAL EXPANSIONS FOR THE ISING-MODEL SO PHYSICAL REVIEW LETTERS LA English DT Letter RP BAKER, GA (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 5 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 30 PY 1992 VL 69 IS 22 BP 3264 EP 3264 DI 10.1103/PhysRevLett.69.3264 PG 1 WC Physics, Multidisciplinary SC Physics GA JZ676 UT WOS:A1992JZ67600034 ER PT J AU WHITFIELD, SB CALDWELL, CD HUANG, DX KRAUSE, MO AF WHITFIELD, SB CALDWELL, CD HUANG, DX KRAUSE, MO TI NEAR THRESHOLD 4D PHOTOEXCITATION AND PHOTOIONIZATION OF XE SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID ANGULAR-DISTRIBUTION; ELECTRON-SPECTROSCOPY; CORE RESONANCES; SHAKE PROCESSES; IONIZED XENON; AUGER; DECAY; SHELL; KR; AUTOIONIZATION AB The angular distribution parameter beta of the N5-O2,3O2,3 Auger lines has been measured between the 4d5/2 and the 4d3/2 thresholds of Xe using the cis technique. The radiationless decay parameter alpha2 for each of the N5-O2,3O2,3 Auger lines and the alignment parameter A20 for the intermediate ion were also determined. Comparisons with previous values of beta and alpha2 for the N5-O2,3O2,3 Auger lines have been made. In addition, shakeoff to the various states of the Xe2+ 5p4 ion has been measured following 4d photoexcitation and found to be small. These results support the contention that near-zero kinetic energy electrons observed following similar photoexcitation in the rare gases result primarily from a two-step process rather than the direct process of shakeoff. C1 BEIJING SYNCHROTRON RADIAT LAB,INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA. OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. RP WHITFIELD, SB (reprint author), UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816, USA. NR 35 TC 35 Z9 35 U1 0 U2 5 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD NOV 28 PY 1992 VL 25 IS 22 BP 4755 EP 4771 DI 10.1088/0953-4075/25/22/012 PG 17 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KA750 UT WOS:A1992KA75000012 ER PT J AU TRAJMAR, S REGISTER, DF CARTWRIGHT, DC CSANAK, G AF TRAJMAR, S REGISTER, DF CARTWRIGHT, DC CSANAK, G TI DIFFERENTIAL AND INTEGRAL CROSS-SECTIONS FOR ELECTRON-IMPACT EXCITATION OF THE N(3)S, N(1)S AND N(3)P (N = 2, 3) LEVELS IN HE SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID INTERMEDIATE ENERGIES; INELASTIC-SCATTERING; GROUND-STATE; 23P STATES; HELIUM; ATOMS; THRESHOLD; N=2; POLARIZATION; COLLISION AB Differential and integral electron impact excitation cross sections are reported for the n3S, n1S and n3P (n = 2, 3) levels in He. Differential cross sections were measured at 30, 50 and 100 eV impact energies in the 10-degrees to 135-degrees angular range, extrapolated to 0 and 180-degrees, and then integrated over all angles to obtain integral cross sections at these three incident electron energies. In addition, differential cross sections were measured for excitation of the n3S (n = 2, 3, 4, 5), n1S and n3P (n = 2, 3, 4) levels at 60 eV impact energy and 30-degrees scattering angle. Theoretical cross sections based on first-order many-body theory (FOMBT) are also reported for these three final state symmetries for the 30-500 eV impact energy range. These new experimental and theoretical results are compared with other data. In general, good qualitative agreement is found between the experimental and theoretical results but there are quantitative discrepancies in the absolute values obtained by experiment and various theoretical methods at impact energies less than 100 eV. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP TRAJMAR, S (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 59 TC 51 Z9 51 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD NOV 28 PY 1992 VL 25 IS 22 BP 4889 EP 4910 DI 10.1088/0953-4075/25/22/022 PG 22 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KA750 UT WOS:A1992KA75000022 ER PT J AU DANG, LX AF DANG, LX TI FLUORIDE-FLUORIDE ASSOCIATION IN WATER FROM MOLECULAR-DYNAMICS SIMULATIONS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID INFINITE DILUTION AB The potential of mean force (PMF) for an F--F- ion pair at room temperature was calculated using a rigid simple point charge (SPC/E) water model and molecular dynamics techniques. The PMF displayed a minimum at an ion-ion separation of 4.3 angstrom with a barrier height of approximately 1.5 kcal/mol. The barrier height is a result, in part, of the presence of two water molecules that simultaneously hydrogen bond to both fluoride ions. To investigate the effect of the ionic charge on the hydration properties of an ion pair, we also computed the PMF for the F+-F+ ion pair. Our calculations indicated that the barrier height of this PMF is less significant than the corresponding barrier height observed in the computed PMF of the F--F- ion pair. This result is reasonable because of the absence of the highly favorable hydrogen bonding between water molecules and the ion pair. When comparing the present calculation with those reported in previous works on similar systems using integral equation techniques, our simulated F--F- PMF displays more structure and the minimum well depth is shallower; however, the barrier to dissociation is comparable. RP DANG, LX (reprint author), PACIFIC NW LAB, MOLEC THEORY MODELING & SIMULAT MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 19 TC 59 Z9 59 U1 2 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 EI 1873-4448 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 27 PY 1992 VL 200 IS 1-2 BP 21 EP 25 DI 10.1016/0009-2614(92)87039-R PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JZ554 UT WOS:A1992JZ55400004 ER PT J AU WANG, XQ WANG, CZ ZHANG, BL HO, KM AF WANG, XQ WANG, CZ ZHANG, BL HO, KM TI RELATIVE STABILITY OF C-78 ISOMERS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID HIGHER FULLERENES; C76 AB The structural and electronic properties of the five C78 isolated-pentagon isomers are studied using all-electron local-density functional calculations with complete geometry optimization. The results are compared with available experimental data, and suggest that kinetic factors play an important role in the formation of large fullerenes. C1 CLARK ATLANTA UNIV,CTR THEORET STUDIES PHYS SYST,ATLANTA,GA 30314. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,US DOE,AMES LAB,AMES,IA 50011. RP WANG, XQ (reprint author), UNIV MINNESOTA,INST THEORET PHYS,116 CHURCH ST SE,MINNEAPOLIS,MN 55455, USA. NR 15 TC 33 Z9 34 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 NOV 27 PY 1992 VL 200 IS 1-2 BP 35 EP 38 DI 10.1016/0009-2614(92)87041-M PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JZ554 UT WOS:A1992JZ55400006 ER PT J AU BARSKY, D PUTZ, B SCHULTEN, K AF BARSKY, D PUTZ, B SCHULTEN, K TI DIFFUSIONAL EDGE ENHANCEMENT OBSERVED BY NMR IN THIN GLASS-CAPILLARIES SO CHEMICAL PHYSICS LETTERS LA English DT Article ID MAGNETIC-RESONANCE MICROSCOPY; RESOLUTION AB In NMR microscopy the effect of molecular diffusion is usually to degrade resolution and sensitivity due to destructive interference of signals from the moving spins. In samples there may exist regions that differ markedly in the translational diffusion coefficient of the molecules whose spatial distribution is being imaged, and in particular, samples may contain barriers impermeable to the translating spins. We present an experimental demonstration that, in the presence of a magnetic field gradient, a reduction in the translational mean free path of liquid molecules, due to barriers, results in the enhancement of magnetization near barriers. Monte Carlo simulations are compared with experiments. The observed effects are induced by barriers, not compartmentalization. This edge enhancement may provide a means through NMR microscopy of visualizing small impermeable structures that might otherwise be invisible. C1 UNIV ILLINOIS,DEPT BIOPHYS,405 N MATHEWS AVE,URBANA,IL 61801. UNIV ILLINOIS,BECKMAN INST,URBANA,IL 61801. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. SANDIA NATL LABS,LIVERMORE,CA 94551. JOHNS HOPKINS UNIV,SCH MED,DEPT RADIOL,NMR RES DIV,BALTIMORE,MD 21205. RI Schulten, Klaus/D-5561-2009; Putz, Benno/P-2630-2016 OI Putz, Benno/0000-0002-2208-209X NR 31 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 27 PY 1992 VL 200 IS 1-2 BP 88 EP 96 DI 10.1016/0009-2614(92)87050-Y PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JZ554 UT WOS:A1992JZ55400015 ER PT J AU RENNER, MW FUJITA, E FUJITA, I PROCYK, AD BOCIAN, DF FAJER, J AF RENNER, MW FUJITA, E FUJITA, I PROCYK, AD BOCIAN, DF FAJER, J TI UNUSUAL SPIN-DENSITY LOCALIZATION IN A PORPHYRIN PI-RADICAL - THE PI-ANION RADICAL OF OCTAETHYLISOBACTERIOCHLORIN SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID PHOSPHATE-SULFITE REDUCTASE; PRIMARY CHARGE SEPARATION; CATION RADICALS; FREE BASE; MOLECULAR-STRUCTURE; NITRITE REDUCTASE; PROSTHETIC GROUPS; ELECTRON-TRANSFER; SIROHYDROCHLORIN; SIROHEME AB Isobacteriochlorins (iBCs) are naturally occurring isomers of bacteriochlorins in which two adjacent rather than two opposite pyrrole rings have lost a beta-beta double bond. Like the photosynthetic chromophores, biological iBCs transfer electrons, and their iron complexes, sirohemes, mediate the six-electron reductions of nitrite to ammonia and of sulfite to hydrogen sulfide. Intriguingly, the metal-free derivatives, sirohydrochlorins, have also been found to be active in sulfite reduction. The mechanisms of electron transfer by sirohemes or sirohydrochlorins are not established. We have thus considered the possibility that the sirohydrochlorin might act as an electron acceptor, as do the equivalent metal-free pheophytins and bacteriopheophytins in photosynthesis. We report here optical, EPR, and ENDOR results for the pi anion radical of a synthetic model, 2,3,7,8,12,13,17,18-octaethyl-iBC, that provide spectral signatures for the putative reduced transient in vivo. The calculated spin profile for the pi anion radical that results from one-electron reduction of the iBC macrocycle is highly unusual. Two different computations, iterative extended Huckel (IEH) and self-consistent-field Pariser-Parr-Pople (PPP) calculations, predict that a-single meso carbon atom (C15) would bear from 0.2 (IEH) to 0.4 (PPP) electrons. Experimental EPR and ENDOR results for the anion radical of octaethyl-iBC fall gratifyingly within the two theoretical values: the observed hyperfine coupling constant of 7.7 G for the proton at C15 corresponds to an unpaired spin density of 0.3 electrons for C15, a uniquely high value for a pi anion radical of a porphyrin derivative. (Optical spectra and additional ENDOR results for the radical support the pi anion formulation.) These results suggest the following: (a) If sirohydrochlorin acts as an electron acceptor in vivo, its anion radical should exhibit a diagnostic EPR signal similar to the one reported here for the synthetic iBC. (b) The high spin density localization at a single carbon renders that position in the radical particularly susceptible to electrophilic attack and opens a novel synthetic avenue for regiospecific chemistry of iBCs via their anion radicals. (c) A considerable effort is now devoted to covalently linked donor-acceptor porphyrin complexes as models of photosynthetic and catalytic electron transfer. Because the unpaired spin density in pi radicals extends onto peripheral substituents, the unusually high spin density at C15 in iBC anion radicals should significantly enhance electronic coupling in donor-acceptor pairs incorporating iBCs covalently linked at that position. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. UNIV CALIF RIVERSIDE,DEPT CHEM,RIVERSIDE,CA 92521. RI Fujita, Etsuko/D-8814-2013 NR 45 TC 9 Z9 9 U1 0 U2 6 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 9597 EP 9600 DI 10.1021/j100203a006 PG 4 WC Chemistry, Physical SC Chemistry GA KA298 UT WOS:A1992KA29800006 ER PT J AU KOURI, DJ ZHU, W MA, X PETTITT, BM HOFFMAN, DK AF KOURI, DJ ZHU, W MA, X PETTITT, BM HOFFMAN, DK TI MONTE-CARLO EVALUATION OF REAL-TIME FEYNMAN PATH-INTEGRALS FOR QUANTAL MANY-BODY DYNAMICS - DISTRIBUTED APPROXIMATING FUNCTIONS AND GAUSSIAN SAMPLING SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID DEPENDENT SCHRODINGER-EQUATION; FOURIER METHOD SOLUTION; EVOLUTION OPERATOR; MOLECULAR-DYNAMICS; SYSTEMS; SCATTERING; PROPAGATOR; SIMULATION; SCHEME AB In this paper we report the initial steps in the development of a Monte Carlo method for evaluation of real-time Feynman path integrals for many-particle dynamics. The approach leads to Gaussian importance sampling for real-time dynamics in which the sampling function is short ranged due to the occurrence of Gaussian factors. These Gaussian factors result from the use of a generalization of our new discrete distributed approximating functions (DDAFs) to continuous distributed approximating functions (CDAFs) so as to replace the exact coordinate representation free-particle propagator by a "CDAF-class, free-particle propagator" which is highly banded. The envelope of the CDAF-class free propagator is the product of a "bare Gaussian", exp[-(x'- x)2sigma2(0)/(2sigma4(0) + H2tau2/m2BAR)], with a "shape polynomial" in (x' - x)2, where sigma(0) is a width parameter at zero time (associated with the description of the wavepacket in terms of Hermite functions), tau is the time step (tau = t/N, where t is the total propagation time), and x and x' are any two configurations of the system. The bare Gaussians are used for Monte Carlo integration of a path integral for the survival probability of a Gaussian wavepacket in a Morse potential. The approach appears promising for real-time quantum Monte Carlo studies based on the time-dependent Schrodinger equation, the time-dependent von Neumann equation, and related equations. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP KOURI, DJ (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 57 TC 63 Z9 63 U1 1 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 9622 EP 9630 DI 10.1021/j100203a013 PG 9 WC Chemistry, Physical SC Chemistry GA KA298 UT WOS:A1992KA29800013 ER PT J AU KOURI, DJ HOFFMAN, DK AF KOURI, DJ HOFFMAN, DK TI TOWARD A NEW TIME-DEPENDENT PATH INTEGRAL FORMALISM BASED ON RESTRICTED QUANTUM PROPAGATORS FOR PHYSICALLY REALIZABLE SYSTEMS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CLASSICAL S-MATRIX; REAL-TIME; EVOLUTION OPERATOR; AMPLITUDE DENSITY; SCATTERING; EQUATION; COLLISIONS AB Various mathematical properties of the exact free and full short-real-time propagators in the coordinate representation are discussed. The viewpoint is emphasized that these properties, which prevent the use of the exact path integral formalism as a basis for straightforward computations and result in bizarre behavior wholly at odds with our (macroscopically conditioned) intuition, are never relevant, in connection with any experimentally realizable system. These computationally disasterous mathematical properties of the kinetic energy part of the propagator may be removed by means of restricting the wave packets which will be propagated to L2 functions which can be fitted, sufficiently accurately, by a polynomial of a specific degree within the envelope of the fitting function. This is an example of "prefiltering" oscillations whose frequency increases without bound (i.e., as the distance \x'- x\ travelled in short time tau). The decay in the kinetic energy, which characterizes any physically realizable system, has been achieved using our continuum distributed approximating functions, which limit the class of wave packets which can be propagated. We also discuss the role of the potential energy. Again, difficulties arise which could be addressed by potential energy cutoff procedures. However, the more desireable possibility of developing a smoothly prefiltered full propagator is pointed out. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP KOURI, DJ (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 35 TC 38 Z9 38 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 26 PY 1992 VL 96 IS 24 BP 9631 EP 9636 DI 10.1021/j100203a014 PG 6 WC Chemistry, Physical SC Chemistry GA KA298 UT WOS:A1992KA29800014 ER PT J AU NAYAR, N HOFFMAN, DK MA, X KOURI, DJ AF NAYAR, N HOFFMAN, DK MA, X KOURI, DJ TI A COMPUTATIONAL DEMONSTRATION OF THE DISTRIBUTED APPROXIMATING FUNCTION-APPROACH TO REAL-TIME QUANTUM DYNAMICS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID DEPENDENT SCHRODINGER-EQUATION; FOURIER METHOD SOLUTION; PROPAGATOR AB We report computational applications of the newly developed distributed approximating function (DAF) approach to real time quantal wavepacket propagation for several one-dimensional model problems. The DAF is constructed to fit all wavepackets accurately which can be represented, to the same accuracy, by a polynomial of degree M, or less, within the envelope of the DAF . (This defines the "DAF class" of functions.) By expressing the DAF (and thus the wavepacket to be propagated) in terms of Hermite functions (each a product of a Hermite polynomial and its Gaussian generating function), the DAF approximation to the wavepacket is propagated freely and exactly for a short time tau. The Hermite functions are the natural basis states for describing the free evolution of a localized particle and yield a highly banded representation for the free particle propagator. Combining the DAF class free propagation scheme with any of several short time approximations to the full propagator enables one to propagate the wavepacket through a potential. The DAF results for the propagated wavepacket and various scattering amplitudes are shown to be in good agreement with those obtained by more standard methods. C1 UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT COMP SCI,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. NR 18 TC 12 Z9 12 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 26 PY 1992 VL 96 IS 24 BP 9637 EP 9643 DI 10.1021/j100203a015 PG 7 WC Chemistry, Physical SC Chemistry GA KA298 UT WOS:A1992KA29800015 ER PT J AU FISHER, ER HO, P BREILAND, WG BUSS, RJ AF FISHER, ER HO, P BREILAND, WG BUSS, RJ TI LASER STUDIES OF THE REACTIVITY OF NH(X3-SIGMA-) WITH THE SURFACE OF SILICON-NITRIDE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELEMENTARY REACTIONS; SINXHY DEPOSITION; NH; NH(A1-DELTA); MOLECULES; TRANSITION; MECHANISM; KINETICS; PLASMA; NO AB The reactivity of NH(X3SIGMA-)) with the surface of both a silicon nitride film and a depositing hydrogenated silicon nitride film has been measured to be essentially zero with an upper limit of 0. 1 for substrate temperatures of 300-700 K. The reactivity was directly determined using spatially resolved laser-induced fluorescence of NH in a plasma-generated molecular beam incident on the surface. The NH adsorbs and then desorbs from the surface with a spatial distribution consistent with a cosine angular distribution. No dependence of reactivity on rotational state of the NH was observed. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 32 TC 32 Z9 32 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 9855 EP 9861 DI 10.1021/j100203a051 PG 7 WC Chemistry, Physical SC Chemistry GA KA298 UT WOS:A1992KA29800051 ER PT J AU DOREY, N KURZEPA, PS AF DOREY, N KURZEPA, PS TI VORTEX CONDENSATION IN A MODEL OF RANDOM PHI-4-GRAPHS SO PHYSICS LETTERS B LA English DT Article ID PERTURBATION-THEORY; LARGE ORDER; STRING THEORY AB We consider a soluble model of large phi4-graphs randomly embedded in one compactified dimension; namely the large-order behaviour of finite-temperature perturbation theory for the partition function of the anharmonic oscillator. We solve the model using semi-classical methods and demonstrate the existence of a critical temperature at which the system undergoes a second-order phase transition from D = 1 to D = 0 behaviour. Non-trivial windings of the closed loops in a graph around the compactified time direction are interpreted as vortices. The critical point has a natural interpretation as the temperature at which these vortices condense and disorder the system. We show that the vortex density increases rapidly in the critical region indicating the break-down of the dilute vortex ps approximation at this point. We discuss the relation of this phenomenon to the Berezinskii-Kosterlitz-Thouless transition in the D = 1 matrix model formulated on a circle. RP DOREY, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,T-8 MS B285,LOS ALAMOS,NM 87545, USA. NR 21 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 26 PY 1992 VL 295 IS 1-2 BP 51 EP 58 DI 10.1016/0370-2693(92)90088-L PG 8 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KA349 UT WOS:A1992KA34900011 ER PT J AU GRAHAM, GE BARKER, AR BRIERE, RA GIBBONS, LK MAKOFF, G PAPADIMITRIOU, V PATTERSON, JR SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R YAMAMOTO, H SWALLOW, EC BOCK, GJ COLEMAN, R ENAGONIO, J HSIUNG, YB RAMBERG, E STANFIELD, K TSCHIRHART, R YAMANAKA, T GOLLIN, GD KARLSSON, M DEBU, P PEYAUD, B TURLAY, R VALLAGE, B AF GRAHAM, GE BARKER, AR BRIERE, RA GIBBONS, LK MAKOFF, G PAPADIMITRIOU, V PATTERSON, JR SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R YAMAMOTO, H SWALLOW, EC BOCK, GJ COLEMAN, R ENAGONIO, J HSIUNG, YB RAMBERG, E STANFIELD, K TSCHIRHART, R YAMANAKA, T GOLLIN, GD KARLSSON, M DEBU, P PEYAUD, B TURLAY, R VALLAGE, B TI SEARCH FOR THE DECAY KL-]PI(0)NU-(NU)-OVER-BAR SO PHYSICS LETTERS B LA English DT Article ID CHIRAL PERTURBATION-THEORY; RARE KAON DECAYS; CP VIOLATION; BRANCHING RATIO; STANDARD MODEL; FORM-FACTOR; KL->PI-0-GAMMA-GAMMA; KL->PI-0E+E; KL->E+E-GAMMA; MESONS AB Data collected in Fermilab experiment E731 was used to perform the first search for the decay K(L) --> pi0nunuBAR. This decay is dominated by short distance effects and is almost entirely direct CP violating within the standard model. Cuts were developed to reject the background processes LAMBDA --> npi0 and K(L) --> pi+e-gammanu. No candidate events were seen. We find BR (K(L) --> pi0nunuBAR) < 2.2. X 10(-4) at the 90% confidence level. C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. ELMHURST COLL,DEPT PHYS,ELMHURST,IL 60126. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. CENS,DEPT PHYS PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE. RP GRAHAM, GE (reprint author), UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637, USA. RI Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 42 TC 10 Z9 10 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 26 PY 1992 VL 295 IS 1-2 BP 169 EP 173 DI 10.1016/0370-2693(92)90107-F PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KA349 UT WOS:A1992KA34900030 ER PT J AU BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PIETRZYK, B PRORIOL, J PRULHIERE, F STIMPFL, G FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ALTOON, B BOYLE, O COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM NASH, J PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P QIAN, Z ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BAUER, C BLUM, W BROWN, D CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LEMAIRE, MC LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J SIMOHAND, D VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F REEVES, P THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S GRUPEN, C MIRABITO, L RIVERA, F SCHAFER, U GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH WALSH, AM WEBER, FV WHITNEY, MH WU, SL WU, X ZOBERNIG, G AF BUSKULIC, D DECAMP, D GOY, C LEES, JP MINARD, MN MOURS, B ALEMANY, R ARIZTIZABAL, F COMAS, P CRESPO, JM DELFINO, M FERNANDEZ, E GAITAN, V GARRIDO, L MATTISON, T PACHECO, A PASCUAL, A CREANZA, D DEPALMA, M FARILLA, A IASELLI, G MAGGI, G MAGGI, M NATALI, S NUZZO, S QUATTROMINI, M RANIERI, A RASO, G ROMANO, F RUGGIERI, F SELVAGGI, G SILVESTRIS, L TEMPESTA, P ZITO, G HU, H HUANG, D HUANG, X LIN, J LOU, J QIAO, C WANG, T XIE, Y XU, D XU, R ZHANG, J ZHAO, W BAUERDICK, LAT BLUCHER, E BONVICINI, G BOSSI, F BOUDREAU, J CASPER, D DREVERMANN, H FORTY, RW GANIS, G GAY, C HAGELBERG, R HARVEY, J HAYWOOD, S HILGART, J JACOBSEN, R JOST, B KNOBLOCH, J LANCON, E LEHRAUS, I LOHSE, T LUSIANI, A MARTINEZ, M MATO, P MEINHARD, H MINTEN, A MIQUEL, R MOSER, HG PALAZZI, P PERLAS, JA PUSZTASZERI, JF RANJARD, F REDLINGER, G ROLANDI, L ROTHBERG, J RUAN, T SAICH, M SCHLATTER, D SCHMELLING, M SEFKOW, F TEJESSY, W WACHSMUTH, H WIEDENMANN, W WILDISH, T WITZELING, W WOTSCHACK, J AJALTOUNI, Z BADAUD, F BARDADINOTWINOWSKA, M BENCHEIKH, AM ELFELLOUS, R FALVARD, A GAY, P GUICHENEY, C HENRARD, P JOUSSET, J MICHEL, B MONTRET, JC PALLIN, D PERRET, P PIETRZYK, B PRORIOL, J PRULHIERE, F STIMPFL, G FEARNLEY, T HANSEN, JD HANSEN, JR HANSEN, PH MOLLERUD, R NILSSON, BS EFTHYMIOPOULOS, I KYRIAKIS, A SIMOPOULOU, E VAYAKI, A ZACHARIADOU, K BADIER, J BLONDEL, A BONNEAUD, G BRIENT, JC FOUQUE, G ORTEU, S ROSOWSKY, A ROUGE, A RUMPF, M TANAKA, R VERDERI, M VIDEAU, H CANDLIN, DJ PARSONS, MI VEITCH, E MONETA, L PARRINI, G CORDEN, M GEORGIOPOULOS, C IKEDA, M LANNUTTI, J LEVINTHAL, D MERMIKIDES, M SAWYER, L WASSERBAECH, S ANTONELLI, A BALDINI, R BENCIVENNI, G BOLOGNA, G CAMPANA, P CAPON, G CERUTTI, F CHIARELLA, V DETTORREPIAZZOLI, B FELICI, G LAURELLI, P MANNOCCHI, G MURTAS, F MURTAS, GP PASSALACQUA, L PEPEALTARELLI, M PICCHI, P ALTOON, B BOYLE, O COLRAIN, P TENHAVE, I LYNCH, JG MAITLAND, W MORTON, WT RAINE, C SCARR, JM SMITH, K THOMPSON, AS TURNBULL, RM BRANDL, B BRAUN, O GEWENIGER, C HANKE, P HEPP, V KLUGE, EE MAUMARY, Y PUTZER, A RENSCH, B STAHL, A TITTEL, K WUNSCH, M BELK, AT BEUSELINCK, R BINNIE, DM CAMERON, W CATTANEO, M COLLING, DJ DORNAN, PJ DUGEAY, S GREENE, AM HASSARD, JF LIESKE, NM NASH, J PATTON, SJ PAYNE, DG PHILLIPS, MJ SEDGBEER, JK TOMALIN, IR WRIGHT, AG KNERINGER, E KUHN, D RUDOLPH, G BOWDERY, CK BRODBECK, TJ FINCH, AJ FOSTER, F HUGHES, G JACKSON, D KEEMER, NR NUTTALL, M PATEL, A SLOAN, T SNOW, SW WHELAN, EP KLEINKNECHT, K RAAB, J RENK, B SANDER, HG SCHMIDT, H STEEG, F WALTHER, SM WOLF, B AUBERT, JJ BENCHOUK, C BONISSENT, A CARR, J COYLE, P DRINKARD, J ETIENNE, F PAPALEXIOU, S PAYRE, P QIAN, Z ROOS, L ROUSSEAU, D SCHWEMLING, P TALBY, M ADLUNG, S BAUER, C BLUM, W BROWN, D CATTANEO, P COWAN, G DEHNING, B DIETL, H DYDAK, F FERNANDEZBOSMAN, M FRANK, M HALLEY, AW LAUBER, J LUTJENS, G LUTZ, G MANNER, W RICHTER, R ROTSCHEIDT, H SCHRODER, J SCHWARZ, AS SETTLES, R SEYWERD, H STIERLIN, U STIEGLER, U STDENIS, R TAKASHIMA, M THOMAS, J WOLF, G BOUCROT, J CALLOT, O CORDIER, A DAVIER, M GRIVAZ, JF HEUSSE, P JAFFE, DE JANOT, P KIM, DW LEDIBERDER, F LEFRANCOIS, J LUTZ, AM SCHUNE, MH VEILLET, JJ VIDEAU, I ZHANG, Z ABBANEO, D AMENDOLIA, SR BAGLIESI, G BATIGNANI, G BOSISIO, L BOTTIGLI, U BOZZI, C BRADASCHIA, C CARPINELLI, M CIOCCI, MA DELLORSO, R FERRANTE, I FIDECARO, F FOA, L FOCARDI, E FORTI, F GIASSI, A GIORGI, MA LIGABUE, F MANNELLI, EB MARROCCHESI, PS MESSINEO, A PALLA, F RIZZO, G SANGUINETTI, G SPAGNOLO, P STEINBERGER, J TENCHINI, R TONELLI, G TRIGGIANI, G VANNINI, C VENTURI, A VERDINI, PG WALSH, J CARTER, JM GREEN, MG MARCH, PV MIR, LM MEDCALF, T QUAZI, IS STRONG, JA WEST, LR BOTTERILL, DR CLIFFT, RW EDGECOCK, TR EDWARDS, M FISHER, SM JONES, TJ NORTON, PR SALMON, DP THOMPSON, JC BLOCHDEVAUX, B COLAS, P DUARTE, H KOZANECKI, W LEMAIRE, MC LOCCI, E LOUCATOS, S MONNIER, E PEREZ, P PERRIER, F RANDER, J RENARDY, JF ROUSSARIE, A SCHULLER, JP SCHWINDLING, J SIMOHAND, D VALLAGE, B JOHNSON, RP LITKE, AM TAYLOR, G WEAR, J ASHMAN, JG BABBAGE, W BOOTH, CN BUTTAR, C CARNEY, RE CARTWRIGHT, S COMBLEY, F HATFIELD, F REEVES, P THOMPSON, LF BARBERIO, E BOHRER, A BRANDT, S GRUPEN, C MIRABITO, L RIVERA, F SCHAFER, U GIANNINI, G GOBBO, B RAGUSA, F BELLANTONI, L CHEN, W CINABRO, D CONWAY, JS COWEN, DF FENG, Z FERGUSON, DPS GAO, YS GRAHL, J HARTON, JL JARED, RC LECLAIRE, BW LISHKA, C PAN, YB PATER, JR SAADI, Y SHARMA, V SCHMITT, M SHI, ZH WALSH, AM WEBER, FV WHITNEY, MH WU, SL WU, X ZOBERNIG, G TI UPDATED MEASUREMENT OF THE AVERAGE B-HADRON LIFETIME SO PHYSICS LETTERS B LA English DT Article ID SEMILEPTONIC DECAYS; E+E ANNIHILATION; QUARK-MODEL; MESONS AB An improved measurement of the average lifetime of b hadrons has been performed with the ALEPH detector. From a sample of 260000 hadronic Z0 decays, recorded during the 1991 LEP run with the silicon vertex detector fully operational, a fit to the impact parameter distribution of lepton tracks coming from semileptonic decays yields an average b hadron lifetime of 1.49 +/- 0.03 +/- 0.06 ps. C1 UNIV AUTONOMA BARCELONA, INST FIS DALTES ENERGIES, E-08193 BARCELONA, SPAIN. UNIV BARI, INFN, SEZ BARI, I-70126 BARI, ITALY. UNIV BARI, DEPT PHYS, I-70126 BARI, ITALY. CHINESE ACAD SCI, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CERN, CH-1211 GENEVA 23, SWITZERLAND. UNIV CLERMONT FERRAND, IN2P3, PHYS CORPUSCULAIRE LAB, CNRS, F-63177 CLERMONT FERRAND, FRANCE. NIELS BOHR INST, DK-2100 COPENHAGEN, DENMARK. DEMOKRITOS NATL CTR SCI RES, GR-15310 ATHENS, GREECE. ECOLE POLYTECH, IN2P3, PHYS NUCL HAUTES ENERGIES LAB, CNRS, F-91128 PALAISEAU, FRANCE. UNIV EDINBURGH, DEPT PHYS, EDINBURGH EH9 3JZ, MIDLOTHIAN, SCOTLAND. UNIV FLORENCE, DEPT PHYS, INFN SEZ FIRENZE, I-50125 FLORENCE, ITALY. FLORIDA STATE UNIV, SUPERCOMP COMPUTAT RES INST, TALLAHASSEE, FL 32306 USA. FLORIDA STATE UNIV, DEPT PHYS, TALLAHASSEE, FL 32306 USA. INFN, LAB NAZL, I-00044 FRASCATI, ITALY. UNIV GLASGOW, DEPT PHYS & ASTRON, GLASGOW G12 8QQ, SCOTLAND. UNIV HEIDELBERG, INST HOCHENERGIEPHYS, W-6900 HEIDELBERG, GERMANY. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED, DEPT PHYS, LONDON SW7 2BZ, ENGLAND. UNIV INNSBRUCK, INST EXPTL PHYS, A-6020 INNSBRUCK, AUSTRIA. UNIV LANCASTER, DEPT PHYS, LANCASTER LA1 4YB, ENGLAND. UNIV MAINZ, INST PHYS, W-6500 MAINZ, GERMANY. FAC SCI LUMINY, CTR PHYS PARTICULES, IN2P3, CNRS, F-13288 MARSEILLE, FRANCE. MAX PLANCK INST PHYS & ASTROPHYS, WERNER HEISENBERG INST PHYS, W-8000 MUNICH 40, GERMANY. UNIV PARIS 11, IN2P3, ACCELERATEUR LINEAIRE LAB, CNRS, F-91405 ORSAY, FRANCE. UNIV PISA, INFN SEZ, DIPARTIMENTO FIS, I-56010 PISA, ITALY. UNIV PISA, SCUOLA NORMALE SUPER, I-56010 PISA, ITALY. UNIV LONDON, ROYAL HOLLOWAY & BEDFORD NEW COLL, DEPT PHYS, EGHAM TW20 0EX, SURREY, ENGLAND. CENS, DAPNIA, SERV PHYS PARTICULES, F-91191 GIF SUR YVETTE, FRANCE. UNIV CALIF SANTA CRUZ, INST PARTICLE PHYS, SANTA CRUZ, CA 95064 USA. UNIV SHEFFIELD, DEPT PHYS, SHEFFIELD S3 7RH, S YORKSHIRE, ENGLAND. UNIV SIEGEN, FACHBEREICH PHYS, W-5900 SIEGEN, GERMANY. UNIV TRIESTE, DIPARTIMENTO FIS, I-34127 TRIESTE, ITALY. INFN SEZ TRIESTE, I-34127 TRIESTE, ITALY. UNIV WISCONSIN, DEPT PHYS, MADISON, WI 53706 USA. UNIV WASHINGTON, SEATTLE, WA 98195 USA. UNIV TURIN, IST FIS GEN, I-10124 TURIN, ITALY. UNIV NAPLES, DIPARTIMENTO SCI FIS, I-80138 NAPLES, ITALY. CNR, IST COSMO GEOFIS, TURIN, ITALY. CERN, DIV PPE, CH-1211 GENEVA 23, SWITZERLAND. LBL, BERKELEY, CA 94720 USA. RP BUSKULIC, D (reprint author), IN2P3, LAPP, CNRS, F-74019 ANNECY LE VIEUX, FRANCE. RI Ligabue, Franco/F-3432-2014; Rizzo, Giuliana/A-8516-2015; ANTONELLI, ANTONELLA/C-6238-2011; Buttar, Craig/D-3706-2011; Stahl, Achim/E-8846-2011; Passalacqua, Luca/F-5127-2011; St.Denis, Richard/C-8997-2012; Forti, Francesco/H-3035-2011; Focardi, Ettore/E-7376-2012; Venturi, Andrea/J-1877-2012; Perrier, Frederic/A-5953-2011; Rolandi, Luigi (Gigi)/E-8563-2013; Colas, Paul/F-2876-2013; Delfino, Manuel/A-1545-2012; Bosman, Martine/J-9917-2014; Fernandez, Enrique/L-5387-2014; Mir, Lluisa-Maria/G-7212-2015; ciocci, maria agnese /I-2153-2015; Hansen, John/B-9058-2015; Lusiani, Alberto/N-2976-2015; Marrocchesi, Pier Simone/N-9068-2015; Lusiani, Alberto/A-3329-2016; Murtas, Fabrizio/B-5729-2012; Booth, Christopher/B-5263-2016; Pacheco Pages, Andres/C-5353-2011; Ferrante, Isidoro/F-1017-2012 OI Edgecock, Rob/0000-0002-7896-3312; Miquel, Ramon/0000-0002-6610-4836; Palazzi, Paolo/0000-0002-4861-391X; RASO, Giuseppe/0000-0002-5660-3711; Seywerd, Henry/0000-0003-4876-730X; Bottigli, Ubaldo/0000-0002-0666-3433; Ligabue, Franco/0000-0002-1549-7107; Bloch-Devaux, Brigitte/0000-0002-2463-1232; Rizzo, Giuliana/0000-0003-1788-2866; Martinez Rodriguez, Manel/0000-0002-9763-9155; Murtas, Fabrizio/0000-0002-7041-6541; Garrido Beltran, Lluis/0000-0001-8883-6539; Stahl, Achim/0000-0002-8369-7506; Forti, Francesco/0000-0001-6535-7965; Focardi, Ettore/0000-0002-3763-5267; Rolandi, Luigi (Gigi)/0000-0002-0635-274X; Delfino, Manuel/0000-0002-9468-4751; Bosman, Martine/0000-0002-7290-643X; Fernandez, Enrique/0000-0002-6405-9488; Mir, Lluisa-Maria/0000-0002-4276-715X; ciocci, maria agnese /0000-0003-0002-5462; Hansen, John/0000-0002-8422-5543; Lusiani, Alberto/0000-0002-6876-3288; Marrocchesi, Pier Simone/0000-0003-1966-140X; Lusiani, Alberto/0000-0002-6876-3288; Booth, Christopher/0000-0002-6051-2847; Pacheco Pages, Andres/0000-0001-8210-1734; Ferrante, Isidoro/0000-0002-0083-7228 NR 25 TC 22 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 26 PY 1992 VL 295 IS 1-2 BP 174 EP 186 DI 10.1016/0370-2693(92)90108-G PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KA349 UT WOS:A1992KA34900031 ER PT J AU ANDERKO, A PITZER, KS AF ANDERKO, A PITZER, KS TI EQUATION OF STATE FOR PURE SODIUM-CHLORIDE SO FLUID PHASE EQUILIBRIA LA English DT Article DE EQUATION OF STATE; SODIUM CHLORIDE; PURE IONIC FLUID; RESTRICTED PRIMITIVE MODEL; VAPOR LIQUID EQUILIBRIUM ID RESTRICTED PRIMITIVE MODEL; IONIC FLUIDS; VAPOR; ASSOCIATION; SYSTEMS AB An equation of state for pure sodium chloride has been developed on the basis of experimental data and results of Monte Carlo simulations for the restricted primitive model (RPM). The experimental data base included limited vapor pressure and saturated liquid density data as well as dimerization equilibrium constants. The liquid densities have been extrapolated to the supercooled region using liquid-phase Monte Carlo data. For this purpose, the parameters of the primitive model have been calculated by assuming that sodium chloride and RPM obey the corresponding states principle over a limited range of conditions. In the near-critical region Monte Carlo data as well as results of cluster calculations have been used with parameters scaled to reproduce the critical temperature obtained by extrapolating saturation data. The RPM parameters employed in the calculations are close to those for crystalline NaCl. The experimental and scaled Monte Carlo data have been reproduced within their accuracy using a van der Waals-type equation of state with two temperature-dependent parameters a and b. The functions representing the temperature dependence of the parameters have been designed to ensure reliable extrapolation to lower and higher temperatures. Formation of Na2Cl2 clusters has been allowed for by using a closed-form term representing the effect of association on the compressibility factor. The performance of the equation has been additionally verified by predicting compressibility factors at low reduced temperatures outside the saturation region and comparing them with scaled Monte Carlo data. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP ANDERKO, A (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. OI Anderko, Andrzej/0000-0002-1522-4889 NR 17 TC 12 Z9 12 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD NOV 25 PY 1992 VL 79 BP 103 EP 112 DI 10.1016/0378-3812(92)85123-P PG 10 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA KC395 UT WOS:A1992KC39500009 ER PT J AU PITZER, KS ANDERKO, A STERNER, SM AF PITZER, KS ANDERKO, A STERNER, SM TI VIRIAL-COEFFICIENTS AND EQUATIONS OF STATE FOR MIXED FLUIDS - APPLICATION TO CH4-H2O SO FLUID PHASE EQUILIBRIA LA English DT Article DE EQUATION OF STATE; VIRIAL COEFFICIENTS; SYSTEM CH4-H2O; MIXED FLUIDS ID THERMODYNAMIC PROPERTIES; MIXTURES; DENSITIES AB The statistical mechanics of both pure and mixed fluids yields expressions in terms of virial expansions. The composition dependencies of various virial coefficients are well established, as are the integrals expressing their values in terms of intermolecular potentials. These expressions are simple for the second virial coefficient but increase in complexity so rapidly for higher coefficients that it is not yet feasible to generate a complete equation of state from intermolecular potentials by this method. But it will be shown that these properties for the second, third, and fourth virial coefficients can be combined in a very useful manner with information from the complete equations of state for the component pure fluids to yield a form for the equation for the mixed fluid which maintains consistency with all of the pertinent principles and has a minimum number of parameters to be evaluated empirically. The system CH4-H2O is presented here as an example and other very recent applications are cited. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP PITZER, KS (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 21 TC 3 Z9 3 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD NOV 25 PY 1992 VL 79 BP 125 EP 137 DI 10.1016/0378-3812(92)85125-R PG 13 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA KC395 UT WOS:A1992KC39500011 ER PT J AU BAKAC, A ESPENSON, JH YOUNG, VG AF BAKAC, A ESPENSON, JH YOUNG, VG TI KINETICS OF ACETYL RADICAL FORMATION FROM METHYL RADICALS AND CARBON-MONOXIDE AND CRYSTAL-STRUCTURES OF 2 ACETYLCOBALT COMPLEXES SO INORGANIC CHEMISTRY LA English DT Article ID AQUEOUS-SOLUTION; CARBONYLATION; BONDS; ALKYL AB Methyl radicals react with macrocyclic cobalt complexes (H2O)2LCo2+ (L1 = 1,4,8,11-tetraazacyclotetradecane, L2 = C-meso-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane)in the presence of CO in acidic aqueous solution. The reaction yields a mixture of methyl and acetyl complexes as a result of the competition between CO and (H2O)2CoL2+ for CH3.. Kinetic competition experiments yielded the rate constant for the capture of CH3. by CO, k(CO) = (2.0 +/- 0.3) X 10(6) M-1 s-1. The acetyl complex of CoL1 crystallizes with either H2O or ClO4-coordinated trans to the acetyl group. Both the red [(ClO4)L1CoC(O)CH3](ClO4) (1) and the yellow [(H2O)L1-CoC(O)CH3](ClO4)2.H2O (2) crystallize in the centric space group P2(1)/c with four molecules in a unit cell of dimensions a = 10.539 (1 ) angstrom, b = 12.548 (2) angstrom, c = 1 4.915 (2) angstrom, and beta = 93.74 (3)-degrees for 1 and a = 12.588 (3) angstrom, b = 8.821 (3) angstrom, c = 19.398 (5) angstrom, and beta = 96.34 (2)-degrees for 2. The data refined to final values of the unweighted R factors of 0.037 (1) and 0.054 (2). C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP BAKAC, A (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 24 TC 19 Z9 19 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 25 PY 1992 VL 31 IS 24 BP 4959 EP 4964 DI 10.1021/ic00050a011 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA KA358 UT WOS:A1992KA35800011 ER PT J AU BROWN, DR CLEGG, MJ DOWNS, AJ FOWLER, RC MINIHAN, AR NORRIS, JR STEIN, L AF BROWN, DR CLEGG, MJ DOWNS, AJ FOWLER, RC MINIHAN, AR NORRIS, JR STEIN, L TI THE DIXENON(1+) CATION - FORMATION IN THE CONDENSED PHASES AND CHARACTERIZATION BY ESR, UV-VISIBLE, AND RAMAN-SPECTROSCOPY SO INORGANIC CHEMISTRY LA English DT Review ID POTENTIAL-ENERGY CURVES; ELECTRON-PARAMAGNETIC-RES; RARE-GAS MOLECULES; XENON(II) COMPOUNDS; DIMER IONS; SPECTRA; XE2; ABSORPTION; RESONANCE; ABINITIO AB The redox chemistry of the couple formed bv XeF+ and elemental xenon gives rise to a green intermediate. This is formed, for example, from XeF+Sb2F11- in antimony pentafluoride solution, irreversibly under the action of various reducing agents (e.g. H2O, Pb, Hg, S02, PF3, or SbF3) or reversibly under the action of xenon gas, and while an overpressure of xenon is maintained, it is long-lived at ambient temperatures. The product has been characterized by a combination of ESR, UV-visible, and Raman spectroscopies, enrichment in Xe-136 or Xe-129 playing a crucial role in establishing that the carrier of the green coloration is the dixenon(l+) cation, Xe2+. Quantitative studies of the UV-visible and Raman spectra of antimony pentafluoride solutions imply that the reversible formation of Xe2+ takes place in accordance with the equilibrium 3Xe + XeF+Sb2F11- + 2SbF5 reversible 2Xe2+Sb2F11-, although a secondary equilibrium finds the Xe2+ bound in a complex with an excess of the oxidant: Xe2+Sb2F11- + XeF+Sb2F11-reversible Xe2+Sb2F11-.XeF+Sb2F11-. The spectroscopic properties of Xe2+ are discussed in relation to those of the isoelectronic species I2- and to the results of previous theoretical calculations. Of the media investigated to date antimony pentafluoride seems to be unique in its ability to support the Xe2+ cation in appreciable concentrations at normal temperatures. C1 UNIV OXFORD,INORGAN CHEM LAB,OXFORD OX1 3QR,ENGLAND. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 100 TC 10 Z9 10 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD NOV 25 PY 1992 VL 31 IS 24 BP 5041 EP 5052 DI 10.1021/ic00050a023 PG 12 WC Chemistry, Inorganic & Nuclear SC Chemistry GA KA358 UT WOS:A1992KA35800023 ER PT J AU FAN, JB ROCHET, M GAILLARDIN, C SMITH, CL AF FAN, JB ROCHET, M GAILLARDIN, C SMITH, CL TI DETECTION AND CHARACTERIZATION OF A RING CHROMOSOME IN THE FISSION YEAST SCHIZOSACCHAROMYCES-POMBE SO NUCLEIC ACIDS RESEARCH LA English DT Article ID I RESTRICTION MAP; PHYSICAL MAP; GENOME; TELOMERES AB NotI and SfiI genomic restriction maps were used to detect and characterize a ring chromosome II in a Schizosaccharomyces pombe strain with a meitotic defect on chromosome II. The ring chromosome was formed by an intrachromosomal fusion near, or at, the very ends of chromosome II. C1 LAWRENCE BERKELEY LAB, DIV STRUCT BIOL, BERKELEY, CA 94720 USA. COLUMBIA UNIV, DEPT GENET & DEV, NEW YORK, NY 10032 USA. UNIV CALIF BERKELEY, DEPT MOLEC & CELL BIOL, BERKELEY, CA 94720 USA. INST NATL AGRON PARIS GRIGNON, CTR BIOTECHNOL AGROIND, GENET MICROORGANISMES LAB, F-78850 THIVERVAL GRIGNON, FRANCE. OI Smith, Cassandra/0000-0002-0346-8907 NR 18 TC 9 Z9 9 U1 0 U2 1 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0305-1048 EI 1362-4962 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD NOV 25 PY 1992 VL 20 IS 22 BP 5943 EP 5945 DI 10.1093/nar/20.22.5943 PG 3 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KB049 UT WOS:A1992KB04900008 PM 1461727 ER PT J AU BLECHNER, SL OLAH, GA STRYNADKA, NCJ HODGES, RS TREWHELLA, J AF BLECHNER, SL OLAH, GA STRYNADKA, NCJ HODGES, RS TREWHELLA, J TI 4CA2+.TROPONIN-C FORMS DIMERS IN SOLUTION AT NEUTRAL PH THAT DISSOCIATE UPON BINDING VARIOUS PEPTIDES - SMALL-ANGLE X-RAY-SCATTERING STUDIES OF PEPTIDE-INDUCED STRUCTURAL-CHANGES SO BIOCHEMISTRY LA English DT Article ID LIGHT-CHAIN KINASE; RABBIT SKELETAL-MUSCLE; AMINO-ACID-SEQUENCE; TROPONIN-C; PHOSPHORYLASE-KINASE; BIOLOGICAL-ACTIVITY; COMPLEX-FORMATION; CENTRAL HELIX; CALMODULIN; CALCIUM AB Small-angle X-ray scattering data have been measured for rabbit skeletal muscle troponin C and its complexes with the venom peptides melittin and mastoparan as well as synthetic peptides based on regions of the troponin I sequence implicated in troponin C binding. At the neutral pH used in this study (pH 6.8), troponin C shows a tendency to form dimers in the presence of 4 mol equiv of Ca2+, but is monomeric in solution when 2 or less mol equiv of Ca2+ is present. The 4Ca2+.troponin C dimers dissociate upon binding melittin, mastoparan, and peptides based on residues 96-115, 1-30, and 1-40 in the troponin I sequence. This result suggests that the peptide-binding sites overlap with the regions of contact between troponin C molecules forming a dimer. Like the structurally homologous calcium-binding protein calmodulin, troponin C shows conformational flexibility upon binding different peptides. Upon binding melittin, troponin C contracts in a similar manner to calmodulin when it binds peptides known to form amphiphilic helices (e.g., melittin, mastoparan, or MLCK-I). In contrast, mastoparan binding to troponin C does not result in a contracted structure. The scattering data indicate troponin C also remains in an extended structure upon binding the inhibitory peptides having the same sequence as residues 96-115 in troponin I. C1 LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87544. UNIV ALBERTA,EDMONTON T6G 2H7,ALBERTA,CANADA. OI Trewhella, Jill/0000-0002-8555-6766 FU NIGMS NIH HHS [GM40528] NR 67 TC 37 Z9 37 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD NOV 24 PY 1992 VL 31 IS 46 BP 11326 EP 11334 DI 10.1021/bi00161a010 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JZ523 UT WOS:A1992JZ52300010 PM 1445871 ER PT J AU BIEGON, A MATHIS, CA BUDINGER, TF AF BIEGON, A MATHIS, CA BUDINGER, TF TI QUANTITATIVE INVITRO AND EXVIVO AUTORADIOGRAPHY OF THE ALPHA-2-ADRENOCEPTOR ANTAGONIST [H-3] ATIPAMEZOLE SO EUROPEAN JOURNAL OF PHARMACOLOGY LA English DT Article DE NORADRENALINE; ALPHA(2)-ADRENOCEPTORS; AUTORADIOGRAPHY; BRAIN IMAGING ID BINDING-SITES; RAT-BRAIN; PHARMACOLOGICAL CHARACTERIZATION; SEROTONIN RECEPTORS; ALPHA-ADRENOCEPTORS; SUICIDE VICTIMS; CLONIDINE; POSTMORTEM; DENSITY; AGENTS AB Atipamezole is an alpha-adrenoceptor antagonist with high affinity and selectivity for the alpha2-receptor. In vitro autoradiography of [H-3]atipamezole on rat and human brain sections revealed a pattern virtually identical to the one observed using H-3-labeled antagonists such as idazoxan or methoxyidazoxan or agonists such as p-aminoclonidine and 5-bromo-6-(2-imidazolin-2-yl-aminoquinoxaline (UK-14304). In vivo studies of [H-3]atipamezole demonstrated good penetration into the brain (0.3-1.8% injected dose/g at 5 min, depending upon brain region). In addition, [H-3]atipamezole displayed rapid in vivo clearance of nonspecific binding such that at 1 h following an i.v. injection of the drug (100 muCi/animal, rat tail vein administration) the pattern of radioactivity in the brain correlated very well with the receptor distribution as seen by in vitro autoradiography. Atipamezole binding in vivo was displaceable by idazoxan. These results demonstrate the potential of suitably labeled atipamezole for regional studies of brain alpha2-adrenoceptors in vitro and in vivo, in experimental animals as well as in human positron emission tomography (PET) studies. RP BIEGON, A (reprint author), LAWRENCE BERKELEY LAB,CTR FUNCT IMAGING,MS 55-121,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Mathis, Chester/A-8607-2009 FU NHLBI NIH HHS [HL-25840]; NINDS NIH HHS [NS-22899] NR 34 TC 26 Z9 26 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-2999 J9 EUR J PHARMACOL JI Eur. J. Pharmacol. PD NOV 24 PY 1992 VL 224 IS 1 BP 27 EP 38 DI 10.1016/0014-2999(92)94814-C PG 12 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA KA024 UT WOS:A1992KA02400005 PM 1360406 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 LEON, RP WERNER, P EDER, C WEBER, ER AF LEON, RP WERNER, P EDER, C WEBER, ER TI STRUCTURE AND THERMAL-STABILITY OF CU-IN PRECIPITATES AND THEIR ROLE IN THE SEMIINSULATING BEHAVIOR OF INPCU SO APPLIED PHYSICS LETTERS LA English DT Article AB InP was found to be semi-insulating after Cu diffusion. This conversion of both n-In P and p-InP was ascribed to the presence of Cu-In precipitates that act as buried Schottky barriers. The thermal stability of both the precipitates and the electrical properties of InP:Cu were studied after high temperature annealing treatments. Atomic resolution microscopy was used to determine the structure of these precipitates. Diffraction studies of some of these inclusions show that they have the structure of the metallic hexagonal compound Cu16In9. The concentration of Cu-In precipitates was found to be comparable with what our calculations show would achieve intrinsic behavior due to the effect of the metallic inclusions. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP LEON, RP (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI,BERKELEY,CA 94720, USA. NR 6 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 NOV 23 PY 1992 VL 61 IS 21 BP 2545 EP 2547 DI 10.1063/1.108121 PG 3 WC Physics, Applied SC Physics GA JZ025 UT WOS:A1992JZ02500017 ER PT J AU SOPORI, BL JONES, K DENG, XJ AF SOPORI, BL JONES, K DENG, XJ TI OBSERVATION OF ENHANCED HYDROGEN DIFFUSION IN SOLAR-CELL SILICON SO APPLIED PHYSICS LETTERS LA English DT Article ID CRYSTALLINE SEMICONDUCTORS; GRAIN-BOUNDARIES; PLASMA AB We report the observation of higher diffusivity of hydrogen in some solar cell silicon compared to that in Czochralski and float zone wafers. SIMS profiles of hydrogen/deuterium, implanted at low energies and in a temperature range of 100-300-degrees-C, are compared for a variety of different types of silicon substrates. In addition, a new technique that utilizes hydrogen decoration of dislocations was applied to directly verify long diffusion depths in some solar cell silicon. Higher diffusivity of hydrogen permits backside hydrogenation of solar cells to be carried out in less than 30 min with a significant improvement in the cell performance. RP SOPORI, BL (reprint author), NATL RENEWABLE ENERGY LAB,1617 COLE BLVD,GOLDEN,CO 80401, USA. NR 16 TC 26 Z9 26 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 23 PY 1992 VL 61 IS 21 BP 2560 EP 2562 DI 10.1063/1.108126 PG 3 WC Physics, Applied SC Physics GA JZ025 UT WOS:A1992JZ02500022 ER PT J AU VOLKEL, AR BISHOP, AR MERTENS, FG WYSIN, GM AF VOLKEL, AR BISHOP, AR MERTENS, FG WYSIN, GM TI DYNAMICS OF VORTICES IN QUASI-2-DIMENSIONAL CLASSICAL HEISENBERG MAGNETS WITH WEAK EASY-PLANE ANISOTROPY SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID KOSTERLITZ-THOULESS TRANSITION; ANTIFERROMAGNET BANI2(PO4)2; NEUTRON-SCATTERING; MODEL; FERROMAGNETS; SYSTEMS AB We present a discussion of the dynamical correlation functions for Heisenberg magnets with a weak easy-plane anisotropy for temperatures just above the Kosterlitz-Thouless phase transition. Compared to the XY-model we find here vortices which have in addition to the well known in-plane structure a localized out-of-plane profile around their centre. For the ferromagnetic case this structure produces an effective magnetic field which acts as a gyro force on the other vortices. Assuming a dilute gas of weakly interacting vortices, we find analytic expressions for the vortex contribution to the dynamical correlation functions. These results are compared (i) with numerical Monte Carlo-molecular dynamics simulations on a 100x100 square lattice allowing us to determine values for the vortex correlation length xi and average vortex velocity uBAR and (ii) with experiments performed on different quasi-two-dimensional magnetic materials. We find that our two calculations are in good agreement with the experiments and the Kosterlitz-Thouless theory on two-dimensional XY magnets as far as static properties are concerned. Data obtained by fitting the width of the central peak in appropriate dynamic structure functions, which reflect the dynamics, show a significant deviation from the results of our calculations, suggesting that here the parameters of the free vortex-gas ansatz are renormalized by additional interactions with vortex pairs (clusters) and/or in-plane spin waves at higher q-values. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. KANSAS STATE UNIV AGR & APPL SCI,DEPT PHYS,MANHATTAN,KS 66506. RP VOLKEL, AR (reprint author), UNIV BAYREUTH,INST PHYS,W-8580 BAYREUTH,GERMANY. RI Wysin, Gary/I-8162-2012 OI Wysin, Gary/0000-0001-8422-800X NR 26 TC 15 Z9 15 U1 1 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD NOV 23 PY 1992 VL 4 IS 47 BP 9411 EP 9422 DI 10.1088/0953-8984/4/47/021 PG 12 WC Physics, Condensed Matter SC Physics GA JZ866 UT WOS:A1992JZ86600021 ER PT J AU BAI, JZ BARDON, O BECKERSZENDY, RA BURNETT, TH CAMPBELL, JS CHEN, SJ CHEN, SM CHEN, YQ CHENG, ZD COLLER, JA COWAN, RF CUI, HC CUI, XZ DING, HL DU, ZZ DUNWOODIE, W FANG, C FERO, MJ GAO, ML GAO, SQ GAO, WX GAO, YN GU, JH GU, SD GU, WX GUO, YN GUO, YY HAN, Y HATANAKA, M HE, J HITLIN, DG HU, GY HU, T HUANG, DQ HUANG, YZ IZEN, JM JIA, QP JIANG, CH JIANG, ZJ JOHNSON, AS JONES, LA KELSEY, MH LAI, YF LANG, PF LANKFORD, A LI, F LI, J LI, PQ LI, QM LI, RB LI, W LI, WD LI, WG LI, YS LIN, SZ LIU, HM LIU, Q LIU, RG LIU, Y LOWERY, B LU, JG MA, DH MA, EC MA, JM MANDELKERN, M MARSISKE, H MAO, HS MAO, ZP MENG, XC NI, HL PAN, LJ PANETTA, JH PORTER, FC PRABHAKAR, EN QI, ND QUE, YK QUIGLEY, J RONG, G SCHMID, B SCHULTZ, J SHANK, JT SHAO, YY SHEN, DL SHENG, HY SHI, HZ SMITH, A SODERSTROM, E SONG, XF STOKER, DP SUN, HS SYNODINOS, J TOKI, WH TONG, GL TORRENCE, E WANG, LZ WANG, M WANG, P WANG, PL WANG, TJ WANG, YY WHITAKER, JS WILSON, RJ WISNIEWSKI, WJ WU, XD XI, DM XIA, XM XIE, PP XIE, XX XU, RS XU, ZQ XUE, ST YAMAMOTO, RK YAN, J YAN, WG YANG, CM YANG, CY YAO, HB YE, MH YE, SZ YU, ZQ ZHANG, BY ZHANG, CC ZHANG, DH ZHANG, HL ZHANG, HY ZHANG, JW ZHANG, LS ZHANG, SQ ZHANG, Y ZHAO, DX ZHAO, M ZHAO, PD ZHAO, WR ZHENG, JP ZHENG, LS ZHENG, ZP ZHOU, GP ZHOU, HS ZHOU, L ZHOU, L ZHOU, XF ZHOU, YH ZHU, QM ZHU, YC ZHU, YS ZIOULAS, G AF BAI, JZ BARDON, O BECKERSZENDY, RA BURNETT, TH CAMPBELL, JS CHEN, SJ CHEN, SM CHEN, YQ CHENG, ZD COLLER, JA COWAN, RF CUI, HC CUI, XZ DING, HL DU, ZZ DUNWOODIE, W FANG, C FERO, MJ GAO, ML GAO, SQ GAO, WX GAO, YN GU, JH GU, SD GU, WX GUO, YN GUO, YY HAN, Y HATANAKA, M HE, J HITLIN, DG HU, GY HU, T HUANG, DQ HUANG, YZ IZEN, JM JIA, QP JIANG, CH JIANG, ZJ JOHNSON, AS JONES, LA KELSEY, MH LAI, YF LANG, PF LANKFORD, A LI, F LI, J LI, PQ LI, QM LI, RB LI, W LI, WD LI, WG LI, YS LIN, SZ LIU, HM LIU, Q LIU, RG LIU, Y LOWERY, B LU, JG MA, DH MA, EC MA, JM MANDELKERN, M MARSISKE, H MAO, HS MAO, ZP MENG, XC NI, HL PAN, LJ PANETTA, JH PORTER, FC PRABHAKAR, EN QI, ND QUE, YK QUIGLEY, J RONG, G SCHMID, B SCHULTZ, J SHANK, JT SHAO, YY SHEN, DL SHENG, HY SHI, HZ SMITH, A SODERSTROM, E SONG, XF STOKER, DP SUN, HS SYNODINOS, J TOKI, WH TONG, GL TORRENCE, E WANG, LZ WANG, M WANG, P WANG, PL WANG, TJ WANG, YY WHITAKER, JS WILSON, RJ WISNIEWSKI, WJ WU, XD XI, DM XIA, XM XIE, PP XIE, XX XU, RS XU, ZQ XUE, ST YAMAMOTO, RK YAN, J YAN, WG YANG, CM YANG, CY YAO, HB YE, MH YE, SZ YU, ZQ ZHANG, BY ZHANG, CC ZHANG, DH ZHANG, HL ZHANG, HY ZHANG, JW ZHANG, LS ZHANG, SQ ZHANG, Y ZHAO, DX ZHAO, M ZHAO, PD ZHAO, WR ZHENG, JP ZHENG, LS ZHENG, ZP ZHOU, GP ZHOU, HS ZHOU, L ZHOU, L ZHOU, XF ZHOU, YH ZHU, QM ZHU, YC ZHU, YS ZIOULAS, G TI MEASUREMENT OF THE MASS OF THE TAU-LEPTON SO PHYSICAL REVIEW LETTERS LA English DT Article ID RADIATIVE-CORRECTIONS AB The mass of the tau lepton has been measured at the Beijing Electron-Positron Collider using the Beijing Spectrometer. A search near threshold for e+ e- --> tau+ tau- was performed. Candidate events were identified by requiring that one tau decay via tau --> enunuBAR, and the other via tau --> mununuBAR. The mass value, obtained from a fit to the energy dependence of the tau+ tau- cross section, is m(tau) = 1776.9(-0.5)+0.4 +/- 0.2 MeV. C1 BOSTON UNIV,BOSTON,MA 02215. CALTECH,PASADENA,CA 91125. UNIV CALIF IRVINE,IRVINE,CA 92717. COLORADO STATE UNIV,FT COLLINS,CO 80523. MIT,CAMBRIDGE,MA 02139. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. UNIV TEXAS,RICHARDSON,TX 75083. UNIV WASHINGTON,SEATTLE,WA 98195. RP BAI, JZ (reprint author), INST HIGH ENERGY PHYS,BEIJING 100039,PEOPLES R CHINA. OI Wilson, Robert/0000-0002-8184-4103 NR 7 TC 84 Z9 89 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 23 PY 1992 VL 69 IS 21 BP 3021 EP 3024 DI 10.1103/PhysRevLett.69.3021 PG 4 WC Physics, Multidisciplinary SC Physics GA JY879 UT WOS:A1992JY87900006 ER PT J AU SCHUMM, BA DOKSHITZER, YL KHOZE, VA KOETKE, DS AF SCHUMM, BA DOKSHITZER, YL KHOZE, VA KOETKE, DS TI AVERAGE CHARGED MULTIPLICITY OF EVENTS CONTAINING HEAVY QUARKS IN E+E- ANNIHILATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID TOTAL CROSS-SECTION; QCD PARTON JETS; HADRON-PRODUCTION; PERTURBATIVE QCD; SPECTRA; DISTRIBUTIONS AB We present the perturbative QCD results for heavy quark event multiplicities in e+ e- annihilation, which provide that the difference delta(Ql) between heavy and light quark event multiplicities at the same c.m.-system (c.m.s.) energy should be a calculable constant, independent of c.m.s. energy, Published data on heavy quark event multiplicities are presented in this light, and are consistent with the energy independence of the multiplicity difference. Averaging over c.m.s. energy, we find that delta(bl) = 4.3 +/- 0.9 and delta(cl) = 2.3 +/- 1.0 tracks, while the perturbative QCD expectations are 5.5 +/- 0.8 and 1.7 +/- 0.5 tracks, respectively. C1 UNIV LUND,DEPT THEORET PHYS,S-22362 LUND,SWEDEN. UNIV DURHAM,CTR PARTICLE THEORY,DURHAM DH1 3LE,ENGLAND. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. CERN,EUROPEAN ORG PARTICLE PHYS,CH-1211 GENEVA 23,SWITZERLAND. RP SCHUMM, BA (reprint author), LAWRENCE BERKELEY LAB,DIV PHYS,BERKELEY,CA 94720, USA. NR 28 TC 47 Z9 47 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 23 PY 1992 VL 69 IS 21 BP 3025 EP 3028 DI 10.1103/PhysRevLett.69.3025 PG 4 WC Physics, Multidisciplinary SC Physics GA JY879 UT WOS:A1992JY87900007 ER PT J AU DENAVIT, J AF DENAVIT, J TI ABSORPTION OF HIGH-INTENSITY SUBPICOSECOND LASERS ON SOLID DENSITY TARGETS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PULSES; PLASMAS AB The absorption of subpicosecond (almost-equal-to 100 fs) high-intensity (I almost-equal-to 10(20)-10(21) W/cm2) laser pulses normally incident on solid density targets is examined by particle simulations, which include electron scattering. For targets which are overdense by factors exceeding 100, electrons accelerated by the ponderomotive force of the laser couple their energy electrostatically to the ions and the absorption efficiency into the ions scales as I1/2. For example, absorption in a carbon target is only a few percent, but a large fraction of the absorbed energy is transferred to the ions. RP DENAVIT, J (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 13 TC 254 Z9 256 U1 1 U2 20 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 23 PY 1992 VL 69 IS 21 BP 3052 EP 3055 DI 10.1103/PhysRevLett.69.3052 PG 4 WC Physics, Multidisciplinary SC Physics GA JY879 UT WOS:A1992JY87900014 ER PT J AU ALOUANI, M ALBERS, RC WILLS, JM SPRINGBORG, M AF ALOUANI, M ALBERS, RC WILLS, JM SPRINGBORG, M TI ABINITIO CALCULATION OF THE DIMERIZATION IN THE HALOGEN-BRIDGED TRANSITION-METAL LINEAR-CHAIN COMPOUND PT2BR6(NH3)4 SO PHYSICAL REVIEW LETTERS LA English DT Article ID HELICAL POLYMERS; POLYACETYLENE AB All-electron local-density-approximation electronic-structure calculations show how the ligand structure of a neutral halogen-bridged transition-metal linear-chain compound, Pt2Br6(NH3)4, Modifies the electronic structure to reduce it to an effective one-dimensional system. The dimerization and opening of the band gap is then understood on the basis of a conventional two-band Su-Schrieffer-Heeger model for isolated chains. Despite the strong pdsigma coupling between the Pt d3z2-r2 and Br p(z) orbitals along the chains, the system will not dimerize in the absence of the ligand structure. C1 OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. UNIV CONSTANCE,FAK CHEM,W-7750 CONSTANCE,GERMANY. RP ALOUANI, M (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Alouani, Mebarek/A-9101-2011 OI Alouani, Mebarek/0000-0002-7985-5276 NR 20 TC 20 Z9 20 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 23 PY 1992 VL 69 IS 21 BP 3104 EP 3107 DI 10.1103/PhysRevLett.69.3104 PG 4 WC Physics, Multidisciplinary SC Physics GA JY879 UT WOS:A1992JY87900027 ER PT J AU CANRIGHT, GS ROJO, AG AF CANRIGHT, GS ROJO, AG TI SOME CONSEQUENCES OF PT SYMMETRY FOR OPTICAL-ROTATION EXPERIMENTS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Note ID TIME C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. RP CANRIGHT, GS (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 9 TC 2 Z9 2 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 23 PY 1992 VL 69 IS 21 BP 3133 EP 3133 DI 10.1103/PhysRevLett.69.3133 PG 1 WC Physics, Multidisciplinary SC Physics GA JY879 UT WOS:A1992JY87900038 ER PT J AU ALEXANDER, WB HOLLOWAY, PH HEATHERLY, L CLAUSING, RE AF ALEXANDER, WB HOLLOWAY, PH HEATHERLY, L CLAUSING, RE TI CRYSTALLITE GEOMETRY OF HOT FILAMENT CHEMICAL VAPOR-DEPOSITED DIAMOND 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 ID METASTABLE GROWTH; CVD; FILMS; MECHANISM; PRESSURE; PHASES; PLASMA AB Diamond crystallites and thin films were grown on (100) Si using CH4, CO and H-2 gases flowing over a heated tungsten filament. The relative sizes of the {100} and {111} facets were used to characterize the growth rate ratio along these two crystal directions. The ratio depended upon the composition of the feed gases as well as the filament temperature. These results were discussed in terms of developing a specific texture in polycrystalline diamond and in terms of adsorption mechanisms which could explain the dependence. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP ALEXANDER, WB (reprint author), UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611, USA. NR 22 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 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV 23 PY 1992 VL 55 IS 1-3 BP 387 EP 391 DI 10.1016/S0257-8972(07)80053-3 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA639 UT WOS:A1992KA63900007 ER PT J AU ERDEMIR, A AF ERDEMIR, A TI ROLLING-CONTACT FATIGUE AND WEAR-RESISTANCE OF HARD COATINGS ON BEARING-STEEL SUBSTRATES 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 ID ION-IMPLANTATION; SURFACE MODIFICATION; CORROSION; IMPROVEMENT; COMPONENTS AB The ever-increasing need for high-performance ball- and roller-bearing components that endure extreme applications has led to a growing interest in hard coatings for improved fatigue life and wear resistance. In particular, hard TiN and TiC coatings and, quite recently, diamond-like carbon films have attracted much attention from manufacturers that produce bearing systems for both rolling and sliding contact applications. This paper presents an overview that highlights recent incremental progress in achieving improved fatigue and wear resistance in bearing-steels through the use of hard coatings. In general, previous research has shown that hard coatings can effectively prolong the fatigue lives of bearing-steel substrates. In particular, thinner hard coatings, 0.2 to 1 mum thick, were found to provide the best overall performance in rolling-contact fatigue (RCF) tests, whereas, thicker hard coatings, > 2 mum, underwent severe delamination and/or fracture and, in most cases, reduced the RCF life of the bearing steels. It was concluded that for these coatings to have any beneficial effect on the RCF life of a bearing steel substrate, it is important that they remain intact on the rolling contact surfaces. Specific references are made to a few mechanistic models that correlate coating thickness and adhesion to improved fatigue life and wear resistance. RP ERDEMIR, A (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,TRIBOL SECT,ARGONNE,IL 60439, USA. NR 60 TC 36 Z9 36 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV 23 PY 1992 VL 55 IS 1-3 BP 482 EP 489 DI 10.1016/S0257-8972(07)80070-3 PG 8 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA639 UT WOS:A1992KA63900024 ER PT J AU AJAYI, OO ERDEMIR, A FENSKE, GR NICHOLS, FA SPROUL, WD GRAHAM, M RUDNIK, PJ AF AJAYI, OO ERDEMIR, A FENSKE, GR NICHOLS, FA SPROUL, WD GRAHAM, M RUDNIK, PJ TI TRIBOLOGICAL BEHAVIOR OF OIL-LUBRICATED TIN-COATED STEEL 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 ID SPUTTERED TIN; COATINGS; WEAR AB The effects of titanium nitride (TiN) coatings on the tribological behavior of M50 and 52100 steels under both dry and oil-lubricated conditions were evaluated with a reciprocating sliding-pin-on-flat test machine. Under dry conditions, the TiN coating reduced wear, which occurred by abrasion and by oxidation of the sliding surface. It also reduced the amount of wear-debris accumulation at the contact interface. During oil lubrication, wear and roughening of the contact area (usually associated with the boundary lubrication regime) was eliminated by the TiN coating. The formation of a boundary film by chemical interaction between the oil additives and the wearing surface was also prevented by the TiN coating. C1 NORTHWESTERN UNIV,BIRL,EVANSTON,IL 60201. RP AJAYI, OO (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. RI Graham, Michael/B-7518-2009 NR 14 TC 14 Z9 14 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV 23 PY 1992 VL 55 IS 1-3 BP 496 EP 501 DI 10.1016/S0257-8972(07)80072-7 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA639 UT WOS:A1992KA63900026 ER PT J AU WANG, BQ GENG, GQ LEVY, AV AF WANG, BQ GENG, GQ LEVY, AV TI EROSION AND EROSION CORROSION BEHAVIOR OF CHROMIZED SILICONIZED STEEL 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 AB The erosion and erosion-corrosion resistances of chromized-siliconized coatings on 1018 carbon steel and 2.25 Cr-1Mo steel (where the composition is in approximate weight per cent) were investigated at test conditions which simulated those in the convection pass zone of circulating fluidized-bed combustors. The erosion and erosion-corrosion behaviors of the chromized-siliconized coatings were compared with those of chromized and chromized-aluminized coatings as well as with that of a plasma-sprayed nickel alloy-chromium carbide composite. It was found that the erosion and erosion-corrosion resistances of chromized-siliconized coatings were much better than those of bare metal, chromized or chromized-aluminized coatings. Their behavior compared favorably with the plasma-sprayed nickel alloy-chromium carbide material. The erosion-corrosion behavior is related to the composition and microstructure of the coatings, and especially to their compactness and porosity. The more compact and less porous the coating, the higher is the erosion-corrosion resistance. Chromium and silicon simultaneously diffused into 1018 and 2.25 Cr-1Mo steels by a single-step pack cementation process resulted in a single-phase ferrite coating which was more compact than straight chromized and chromized-aluminized coatings on steels. Moreover, the chromized-siliconized single-phase coating had a higher oxidation resistance than the other two coatings which have two-phase or multiphase structures. This is the reason why the chromized-siliconized coating exhibited the best erosion-corrosion behavior of the three diffusion-type coatings compared. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WANG, BQ (reprint author), XIAN INST HIGHWAY,XIAN,PEOPLES R CHINA. NR 13 TC 8 Z9 8 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV 23 PY 1992 VL 55 IS 1-3 BP 529 EP 535 DI 10.1016/S0257-8972(07)80077-6 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA639 UT WOS:A1992KA63900031 ER PT J AU WANG, J AF WANG, J TI FREE-VIBRATION OF STEPPED CIRCULAR PLATES ON ELASTIC FOUNDATIONS SO JOURNAL OF SOUND AND VIBRATION LA English DT Letter C1 ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. NR 7 TC 11 Z9 11 U1 0 U2 2 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 NOV 22 PY 1992 VL 159 IS 1 BP 175 EP 181 DI 10.1016/0022-460X(92)90457-9 PG 7 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA KB449 UT WOS:A1992KB44900011 ER PT J AU CAMPISI, J AF CAMPISI, J TI GENE-EXPRESSION IN QUIESCENT AND SENESCENT FIBROBLASTS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID HUMAN-DIPLOID FIBROBLASTS; LARGE T-ANTIGEN; SV40 LARGE-T; CELLULAR SENESCENCE; PRODUCT; GROWTH RP CAMPISI, J (reprint author), LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720, USA. NR 21 TC 25 Z9 25 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD NOV 21 PY 1992 VL 663 BP 195 EP 201 DI 10.1111/j.1749-6632.1992.tb38663.x PG 7 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KJ581 UT WOS:A1992KJ58100022 PM 1482053 ER PT J AU DUARTE, FJ PAISNER, JA PENZKOFER, A AF DUARTE, FJ PAISNER, JA PENZKOFER, A TI DYE-LASERS - INTRODUCTION SO APPLIED OPTICS LA English DT Editorial Material ID STABILIZATION; PULSES; PHASE AB This special issue of Applied Optics provides a perspective on recent trends in dye laser research. C1 UNIV REGENSBURG,FAK PHYS 2,W-8400 REGENSBURG,GERMANY. LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,INERTIAL CONFINEMENT FUS PROGRAM,LIVERMORE,CA 94551. RP DUARTE, FJ (reprint author), EASTMAN KODAK CO,IMAGING RES LABS,ROCHESTER,NY 14650, USA. NR 21 TC 6 Z9 6 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 20 PY 1992 VL 31 IS 33 BP 6977 EP 6978 PG 2 WC Optics SC Optics GA JY577 UT WOS:A1992JY57700008 PM 20802555 ER PT J AU BASS, IL BONANNO, RE HACKEL, RP HAMMOND, PR AF BASS, IL BONANNO, RE HACKEL, RP HAMMOND, PR TI HIGH-AVERAGE-POWER DYE-LASER AT LAWRENCE-LIVERMORE-NATIONAL-LABORATORY SO APPLIED OPTICS LA English DT Article AB The copper-laser-pumped dye laser system developed at the Lawrence Livermore National Laboratory (LLNL) is now capable of sustained, efficient, and reliable operation at total powers exceeding 2500 W and single amplifier chain powers exceeding 1300 W. Wavelength center frequency stability is maintainable to < 50 MHz. Laser dyes developed at LLNL permit tunability from 550 to 650 nm. Wave-front quality is < lambda/4 peak to valley. The system is operated remotely with the aid of a comprehensive set of diagnostics. Besides supporting its primary atomic-vapor-laser-isotope-separation mission, the system is being used in alternate applications such as materials processing and the generation of artificial guide stars. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 44 TC 58 Z9 60 U1 1 U2 4 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 6993 EP 7006 PG 14 WC Optics SC Optics GA JY577 UT WOS:A1992JY57700012 PM 20802559 ER PT J AU JENSEN, CC SCHRODER, H AF JENSEN, CC SCHRODER, H TI COMPLETE OPTICAL ANALYSIS OF AN UV LASER-DYE USING SATURATION TECHNIQUES SO APPLIED OPTICS LA English DT Article ID SINGLET-STATE ABSORPTION AB The saturation properties of an UV laser dye, 3,5,3,5-tetra-t-butyl-p-sexiphenyl (TBS), pumped by a XeCl laser were studied. The experimental data included measurements of the optical saturation of transmission and amplifier gain. The data were fit directly to photon propagation differential equations to obtain the saturation intensities for absorption and emission. From the measured saturation parameters a complete determination was made of the optical constants of the singlet states in TBS. The results presented include the absorption spectrum, fluorescence spectrum, fluorescence lifetime, excited-state absorption cross sections at the pump laser and dye laser wavelengths, quantum yield, wavelength dependence of the stimulated emission cross section, and an upper bound for the intersystem crossing rate. The saturation analysis method provides a rapid experimental evaluation of a laser dye with high accuracy. A two-photon excited transition at the long wavelengths of the laser oscillator tuning range of TBS produces photochemical degradation. The photochemical degradation rate increases with increasing wavelength. C1 MAX PLANCK INST QUANTUM OPT,W-8046 GARCHING,GERMANY. RP JENSEN, CC (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 8 TC 4 Z9 4 U1 0 U2 3 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 7012 EP 7021 PG 10 WC Optics SC Optics GA JY577 UT WOS:A1992JY57700014 PM 20802561 ER PT J AU HAMMOND, P COOKE, D AF HAMMOND, P COOKE, D TI CONTINUOUS-WAVE DYE-LASERS IN THE DCM REGION SO APPLIED OPTICS LA English DT Article DE JET-STREAM DYE LASERS; DCM DYES; SOLUBILITY; STRUCTURE; PERFORMANCE; MUTAGENICITY; GLYCOLS; HYGROSCOPICITY ID ISOMERIZATION; PERFORMANCE AB Laser dye DCM in an ethylene glycol solution is a favored medium for converting the argon-ion 488- and 514-nm pump lines to tunable radiation in the 600-730-nm region. However, the dye precipitates from solution, is a powerful mutagen, and the glycol solvent is hygroscopic. Replacement dyes in 3-phenyl-1-propanol or 2-phenoxyethanol, particularly the latter, are proposed. RP HAMMOND, P (reprint author), LAWRENCE LIVERMORE NATL LAB,L-463,POB 808,LIVERMORE,CA 94550, USA. NR 15 TC 2 Z9 2 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 NOV 20 PY 1992 VL 31 IS 33 BP 7095 EP 7099 PG 5 WC Optics SC Optics GA JY577 UT WOS:A1992JY57700024 PM 20802571 ER PT J AU SONG, P RUSSELL, CT THOMSEN, MF AF SONG, P RUSSELL, CT THOMSEN, MF TI WAVES IN THE INNER MAGNETOSHEATH - A CASE-STUDY SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID DAYSIDE MAGNETOSHEATH; MIRROR INSTABILITY AB We study the waves within, and upstream of, the density enhancements in front of the magnetopause using magnetic field and plasma measurements from ISEE 1 and 2. The waves upstream of the density enhancements are most likely to be mirror modes and are convected with the magnetosheath flow. Within the density enhancements there is additional wave power at lower frequencies. These low frequency waves appear to be slow modes propagating sunward and quasi-standing in the flow. These observations lend support to the contention that the outer edge of the density enhancement is a slow mode wave front which marks the greatest distance that slow modes can propagate upstream into the solar wind. C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SONG, P (reprint author), NATL CTR ATMOSPHER RES,HIGH ALTITUDE OBSERV,POB 3000,BOULDER,CO 80307, USA. OI Russell, Christopher/0000-0003-1639-8298 NR 13 TC 45 Z9 45 U1 0 U2 2 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 2191 EP 2194 DI 10.1029/92GL02499 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KA015 UT WOS:A1992KA01500002 ER PT J AU KOYAMA, T JOHNSON, TR FISCHER, DF AF KOYAMA, T JOHNSON, TR FISCHER, DF TI DISTRIBUTION OF ACTINIDES IN MOLTEN CHLORIDE SALT CADMIUM METAL SYSTEMS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article AB The equilibrium concentrations of uranium, neptunium, plutonium, americium and curium between molten chloride salts and cadmium at 773 K have been measured by several researchers who are developing fuel recovery processes for the Integral Fast Reactor. The data were statistically analyzed based on a thermodynamic relationship between the distribution coefficient of any transuranic (TRU) element and the uranium coefficient. The TRU coefficients were found to be directly proportional to the uranium coefficient over wide ranges of actinide concentrations in the salt and metal phases. For salts containing large fractions of LiCl and KCl, the proportionality factors, or separation factors relative to uranium, at 773 K were: neptunium, 2.1; plutonium, 1.9; americium, 3.1; curium, 3.5. C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. NR 21 TC 54 Z9 54 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD NOV 20 PY 1992 VL 189 IS 1 BP 37 EP 44 DI 10.1016/0925-8388(92)90043-9 PG 8 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA JW879 UT WOS:A1992JW87900016 ER PT J AU FRITZ, JS JUNK, GA AF FRITZ, JS JUNK, GA TI CHROMATOGRAPHIC CLASSIC - USE OF MACRORETICULAR RESINS IN THE ANALYSIS OF WATER FOR TRACE ORGANIC CONTAMINANTS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP FRITZ, JS (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 10 TC 3 Z9 3 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD NOV 20 PY 1992 VL 625 IS 2 BP 87 EP 90 DI 10.1016/0021-9673(92)85189-Z PG 4 WC Chemistry, Analytical SC Chemistry GA KA517 UT WOS:A1992KA51700001 PM 1474129 ER PT J AU SLINGO, JM SPERBER, KR MORCRETTE, JJ POTTER, GL AF SLINGO, JM SPERBER, KR MORCRETTE, JJ POTTER, GL TI ANALYSIS OF THE TEMPORAL BEHAVIOR OF CONVECTION IN THE TROPICS OF THE EUROPEAN-CENTER-FOR-MEDIUM-RANGE-WEATHER-FORECASTS-MODEL SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID OUTGOING LONGWAVE RADIATION; SYNOPTIC-SCALE DISTURBANCES; WAVENUMBER-FREQUENCY DOMAIN; UPPER TROPOSPHERIC WAVES; 30-60 DAY OSCILLATION; 40-50 DAY OSCILLATION; WESTERN PACIFIC; EASTERLY WAVES; DIURNAL-VARIATION; NORTHERN SUMMER AB Extended (180-day) high resolution (T106) perpetual January and July integrations of the European Centre for Medium-Range Weather Forecasts (ECMWF) model have been analyzed in terms of the spatial and temporal characteristics of the model's convective activity in the tropics. The model's outgoing longwave radiation (OLR) is used as a surrogate for convective activity, consistent with similar studies based on satellite observations. The 3 hourly temporal sampling is sufficient to allow diagnosis of intradiurnal and interdiurnal variability; the length of the integrations is adequate for identifying lower-frequency, intraseasonal phenomena. Wherever possible, use is made of results from surface or satellite observations of the temporal characteristics of convection to verify the model results. At intradiurnal time scales the model captures the amplitude and phase of the diurnal harmonic over both land and sea. The largest amplitudes occur over the summer continents, with contrasting phases of maximum OLR depending on the presence of convective activity. Over the oceans the model shows a coherent structure to the diurnal cycle associated with regions of convection. Analysis of synoptic (2 to 10 days) and low-frequency (greater than 10 days) variability shows that in many instances the model agrees well with observations. For both seasons the model simulates westward moving phenomena over the oceans, whose phase speed is reasonable. In July these easterly waves display well-defined periodicities, in agreement with observations, while in January they are more episodic. Low-frequency variability is more prevalent in January, particularly over the convectively active regions of the eastern hemisphere. In general, this variability has a larger spatial scale than the synoptic variability; its periodicities, some in excess of 30 days, are typical of intraseasonal time scales. C1 EUROPEAN CTR MEDIUM RANGE WEATHER FORECASTS, READING, ENGLAND. LAWRENCE LIVERMORE NATL LAB, PROGRAM CLIMATE MODEL DIAGN & INTERCOMPAISON, LIVERMORE, CA 94551 USA. RP UNIV READING, DEPT METEOROL, READING RG6 2AU, ENGLAND. RI Sperber, Kenneth/H-2333-2012 NR 56 TC 19 Z9 19 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X EI 2169-8996 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 20 PY 1992 VL 97 IS D16 BP 18119 EP 18135 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JZ602 UT WOS:A1992JZ60200009 ER PT J AU ARONDEL, V LEMIEUX, B HWANG, I GIBSON, S GOODMAN, HM SOMERVILLE, CR AF ARONDEL, V LEMIEUX, B HWANG, I GIBSON, S GOODMAN, HM SOMERVILLE, CR TI MAP-BASED CLONING OF A GENE CONTROLLING OMEGA-3-FATTY-ACID DESATURATION IN ARABIDOPSIS SO SCIENCE LA English DT Article ID POLYMORPHISM LINKAGE MAP; THALIANA; DNA; METABOLISM; MUTANTS; PLASMID; PLANTS AB A gene from the flowering plant Arabidopsis thaliana that encodes an omega-3 desaturase was cloned on the basis of the genetic map position of a mutation affecting membrane and storage lipid fatty acid composition. Yeast artificial chromosomes covering the genetic locus were identified and used to probe a seed complementary DNA library. A complementary DNA clone for the desaturase was identified and introduced into roots of both wild-type and mutant plants by Ti plasmid-mediated transformation. Transgenic tissues of both mutant and wild-type plants had significantly increased amounts of the fatty acid produced by this desaturase. C1 MICHIGAN STATE UNIV, US DOE, PLANT RES LAB, E LANSING, MI 48824 USA. YORK UNIV, DEPT BIOL, N YORK M3J 1P3, ONTARIO, CANADA. HARVARD UNIV, SCH MED, DEPT GENET, BOSTON, MA 02115 USA. MASSACHUSETTS GEN HOSP, DEPT MOLEC BIOL, BOSTON, MA 02114 USA. RI Somerville, Christopher/A-4048-2009 OI Somerville, Christopher/0000-0003-4647-0094 NR 24 TC 325 Z9 355 U1 2 U2 22 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD NOV 20 PY 1992 VL 258 IS 5086 BP 1353 EP 1355 DI 10.1126/science.1455229 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JY958 UT WOS:A1992JY95800037 PM 1455229 ER PT J AU PANDIT, J BOHM, A JANCARIK, J HALENBECK, R KOTHS, K KIM, SH AF PANDIT, J BOHM, A JANCARIK, J HALENBECK, R KOTHS, K KIM, SH TI 3-DIMENSIONAL STRUCTURE OF DIMERIC HUMAN RECOMBINANT MACROPHAGE COLONY-STIMULATING FACTOR SO SCIENCE LA English DT Article ID GROWTH-FACTOR; MACROMOLECULAR CRYSTALLOGRAPHY; WEISSENBERG CAMERA; MOLECULAR-CLONING; FACTOR CSF-1; RECEPTOR; PROTEIN AB Macrophage colony-stimulating factor (M-CSF) triggers the development of cells of the monocyte-macrophage lineage and has a variety of stimulatory effects on mature cells of this class. The biologically active form of M-CSF is a disulfide-linked dimer that activates an intrinsic tyrosine kinase activity on the M-CSF receptor by inducing dimerization of the receptor molecules. The structure of a recombinant human M-CSF dimer, determined at 2.5 angstroms by x-ray crystallography, contains two bundles of four alpha helices laid end-to-end, with an interchain disulfide bond. Individual monomers of M-CSF show a close structural similarity to the cytokines granulocyte-macrophage colony-stimulating factor and human growth hormone. Both of these cytokines are monomeric in their active form, and their specific receptors lack intrinsic tyrosine kinase activity. The similarity of these structures suggests that the receptor binding determinants for all three cytokines may be similar. C1 LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,BIOPHYS GRAD GRP,BERKELEY,CA 94720. CHIRON CORP,DEPT BIOL THERAPEUT,EMERYVILLE,CA 94608. NR 31 TC 157 Z9 159 U1 0 U2 2 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 20 PY 1992 VL 258 IS 5086 BP 1358 EP 1362 DI 10.1126/science.1455231 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JY958 UT WOS:A1992JY95800039 PM 1455231 ER PT J AU GEOHEGAN, DB AF GEOHEGAN, DB TI PHYSICS AND DIAGNOSTICS OF LASER ABLATION PLUME PROPAGATION FOR HIGH-TC SUPERCONDUCTOR FILM GROWTH SO THIN SOLID FILMS LA English DT Article ID OXYGEN ENVIRONMENT; DEPOSITION; DYNAMICS AB The formation, composition and propagation of laser-produced plasmas used for pulsed laser deposition (PLD) of Y1Ba2Cu3O7-x have been studied under film growth conditions. Four complementary spatially and temporally resolved in situ diagnostic techniques are applied to characterize the expansion of the laser plume into both vacuum and ambient gases: optical emission and absorption spectroscopy, fast ion probe measurements, and fast photography with a gated, image-intensified charge-coupled detector-array (ICCD) camera system. Transient optical absorption spectroscopy reveals large densities of ground state atoms, ions, and molecules in the plume as well as a slower component to the plume transport than is indicated by the plasma fluorescence and ion current. Ablation into background gases results in scattering and attenuation of the laser plume. The exponential attenuation of the positive ion flux transmitted through 50-300 mTorr background oxygen is measured and used to define an overall ion-oxygen reaction cross-section sigma(i-O2) = 2.3 x 10(-16) cm2 under the described film growth conditions. The slowing of the laser plasma and formation of shock structures due to collisions with the ambient gas are described using ion probe measurements and ICCD photographic comparisons of expansion into vacuum and background oxygen. At the pressures used for PLD, distance-time R-t plots derived from the photographs and ion probe waveforms indicate that the higher pressure plume initially expands through the ambient gas in accordance with a drag model (where R = x(f)[1 - exp( - betat)]), experiencing little slowing until a visible shock structure forms. Following a transition period, in which the plume appears to have two components, a single-component shock structure propagates in better agreement with a shock, or blast wave (R = xi0(E/rho0)1/5t2/5) model. RP GEOHEGAN, DB (reprint author), OAK RIDGE NATL LAB, DIV SOLID STATE, POB 2008, OAK RIDGE, TN 37831 USA. RI Geohegan, David/D-3599-2013 OI Geohegan, David/0000-0003-0273-3139 NR 18 TC 129 Z9 131 U1 2 U2 19 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 20 PY 1992 VL 220 IS 1-2 BP 138 EP 145 DI 10.1016/0040-6090(92)90562-P PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA KA735 UT WOS:A1992KA73500024 ER PT J AU JANKOWSKI, AF AF JANKOWSKI, AF TI ON ELIMINATING DEPOSITION-INDUCED AMORPHIZATION OF INTERFACES IN REFRACTORY-METAL MULTILAYER SYSTEMS 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 ELECTRON-MICROSCOPY; MIRRORS; GROWTH AB Multilayer thin films with refractory metal components are susceptible to solid state amorphization. It is an objective to minimize this interfacial reaction in order to ensure smooth layering and compositionally abrupt interfaces. These features are desirable for maximum reflectivity in X-ray optic applications such as projection lithography as well as neutron supermirror applications. This goal is achievable when the deposition process is optimized to thermalize the sputtered neutrals. Low working gas pressures (below 5 m Torr) and large source-to-substrate distances (more than 12 cm) typically provide the proper conditions to form dense sputter deposits without adatom-induced, interfacial amorphization. The interfaces of Mo/Si and Ni/Ti multilayers are examined with high resolution electron microscopy for samples sputter deposited under thermalized conditions. It is shown to be possible to produce crystalline, refractory metal layers in the as-deposited structure without amorphous interfacial regions. RP JANKOWSKI, AF (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 19 TC 13 Z9 13 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD NOV 20 PY 1992 VL 220 IS 1-2 BP 166 EP 171 DI 10.1016/0040-6090(92)90567-U PG 6 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA KA735 UT WOS:A1992KA73500029 ER PT J AU EXARHOS, GJ HESS, NJ AF EXARHOS, GJ HESS, NJ TI SPECTROSCOPIC MEASUREMENTS OF STRESS-RELAXATION DURING THERMALLY INDUCED CRYSTALLIZATION OF AMORPHOUS TITANIA FILMS 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 RAMAN MICROPROBE; SCATTERING; KINETICS; GAAS AB Amorphous TiO2 optical films transform irreversibly to a crystalline phase when subjected to temperatures in excess of 573 K. The transformation is accompanied by film densification and a marked change in the intrinsic film stress. Work reported here involves the application of real-time Raman spectroscopy to follow the transformation dynamics and to evaluate transient stresses which evolve during thermally induced crystallization of amorphous sol-gel deposited films. Relative changes in vibrational mode intensities characteristic of the crystalline phase correlate with the degree of crystallinity in the film while mode frequency shifts also acquired in real time are used to estimate the film temperature and the magnitude of internal stress. A contour analysis method is presented whereby knowledge of two vibrational mode frequencies is sufficient to determine these quantities uniquely. Results suggest that both deposition temperature and crystallization temperature affect the intrinsic film stress. Advantages and limitations of this method for the evaluation of stress in dielectric films are discussed. RP EXARHOS, GJ (reprint author), PACIFIC NW LAB, MS K2-44,POB 999, RICHLAND, WA 99352 USA. OI Hess, Nancy/0000-0002-8930-9500 NR 16 TC 46 Z9 47 U1 2 U2 10 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 254 EP 260 DI 10.1016/0040-6090(92)90581-U PG 7 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA KA735 UT WOS:A1992KA73500043 ER PT J AU COLLINS, JC TKACHOV, FV AF COLLINS, JC TKACHOV, FV TI BREAKDOWN OF DIMENSIONAL REGULARIZATION IN THE SUDAKOV PROBLEM SO PHYSICS LETTERS B LA English DT Article ID HADRON-HADRON SCATTERING; APPROXIMATION; QCD AB An explicit example is presented (a one-loop triangle graph) where dimensional regularization fails to regulate the infra-red singularities that emerge at intermediate steps of studying large-Q2 Sudakov factorization. The mathematical nature of the phenomenon is explained within the framework of the theory of the As-operation. C1 FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510. RP COLLINS, JC (reprint author), PENN STATE UNIV,DEPT PHYS,104 DAVEY LAB,UNIV PK,PA 16802, USA. OI Collins, John/0000-0001-6399-9251 NR 24 TC 16 Z9 16 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 19 PY 1992 VL 294 IS 3-4 BP 403 EP 411 DI 10.1016/0370-2693(92)91541-G PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JZ672 UT WOS:A1992JZ67200017 ER PT J AU AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C AF AMSLER, C AUGUSTIN, I BAKER, CA BARNETT, BM BATTY, CJ BEUCHERT, K BIRIEN, P BISTIRLICH, J BLUM, P BOSSINGHAM, R BOSSY, H BRAUNE, K BUGG, DV BURCHELL, M CASE, T CHUNG, SU COOPER, A CROWE, KM DIETZ, HP VONDOMBROWSKI, S DOSER, M DUNNWEBER, W ENGELHARDT, D ENGLERT, M FAESSLER, MA FELIX, C FOLGER, G HACKMANN, R HADDOCK, RP HEINSIUS, FH HESSEY, NP HIDAS, P ILLINGER, P JAMNIK, D KALINOWSKY, H KAMMLE, B KIEL, T KISIEL, J KLEMPT, E KOBEL, M KOCH, H KOLO, C KONIGSMANN, K KUNZE, M LANDUA, R LUDEMANN, J MATTHAEY, H MERKEL, M MERLO, JP MEYER, CA MEYERBERKHOUT, U MONTANET, L NOBLE, A PETERS, K PINTER, G RAVNDAL, S SANJARI, AH SCHAFER, E SCHMID, B SCHMIDT, P SPANIER, S STRASSBURGER, C STROHBUSCH, U SUFFERT, M URNER, D VOLCKER, C WALTHER, D WIEDNER, U WINTER, N ZOLL, J ZUPANCIC, C TI THE PSEUDOSCALAR MIXING ANGLE THETA(PS) FROM ETA AND ETA' PRODUCTION IN (P)OVER-BAR-P ANNIHILATION AT REST SO PHYSICS LETTERS B LA English DT Article ID PROTON-ANTIPROTON ANNIHILATION; QUARK-LINE RULE; NEUTRAL MESONS; J/PSI-DECAYS; 2 MESONS; VECTOR; STATE AB We have determined ratios of branching ratios for ppBAR annihilations at rest into pi0eta and pi0eta', into etaeta and etaeta', and into omegaeta and omegaeta'. All reactions are observed in two different all-neutral final states. The ratios permit a determination of the pseudoscalar mixing angle. We find THETA(PS) = -(17.3 +/- 1.8)-degrees. C1 UNIV KARLSRUHE,W-7500 KARLSRUHE,GERMANY. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV MAINZ,W-6500 MAINZ,GERMANY. RUHR UNIV BOCHUM,W-4630 BOCHUM,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV MUNICH,W-8000 MUNICH 2,GERMANY. QUEEN MARY & WESTFIELD COLL,LONDON E1 4NS,ENGLAND. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. ACAD SCI BUDAPEST,H-1525 BUDAPEST,HUNGARY. CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. RP AMSLER, C (reprint author), UNIV ZURICH,CH-8001 ZURICH,SWITZERLAND. RI Meyer, Curtis/L-3488-2014 OI Meyer, Curtis/0000-0001-7599-3973 NR 23 TC 70 Z9 70 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 J9 PHYS LETT B JI Phys. Lett. B PD NOV 19 PY 1992 VL 294 IS 3-4 BP 451 EP 456 DI 10.1016/0370-2693(92)91547-M PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JZ672 UT WOS:A1992JZ67200023 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOSETI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP 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SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC TI SEARCHES FOR NONMINIMAL HIGGS BOSONS IN Z0 DECAYS SO PHYSICS LETTERS B LA English DT Article AB We report on a general search for neutral and charged Higgs bosons with no assumption that the Higgs sector consists of a single doublet as in the minimal standard model. No signal inconsistent with background is observed in any of the decay channels analysed. From the results of direct searches, model independent limits on Higgs bremsstrahlung and on Higgs pair production from the Z0 are presented. We interpret the bremsstrahlung limits in the general two-doublet model. Z0 lineshape measurements further restrict the parameter space available in the two-doublet model. Finally, the results are interpreted in the framework of the minimal supersymmetric extension of the standard model. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. NAPLES UNIV, I-80125 NAPLES, ITALY. INFN, SEZ NAPOLI, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. INFN, SEZ PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. SWISS FED INST TECHNOL, EIDGENOSS TECH HSCH, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. NUCL PHYS INST, ST PETERSBURG, USSR. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. INST THEORET & EXPTL PHYS, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. INFN, SEZ ROMA, I-00185 ROME, ITALY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. INFN, SEZ MILANO, I-20133 MILAN, ITALY. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. LAPP, CNRS, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. UNIV CALIF, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST PHYS NUCL LYON, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CHINESE UNIV SCI & TECHNOL, ANHUI 230029, PEOPLES R CHINA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. RP ADRIANI, O (reprint author), INFN, SEZ FIRENZE, I-50125 FLORENCE, ITALY. RI van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Kamyshkov, Yuri/J-7999-2016; Tsaregorodtsev, Andrei/E-3873-2016; Lista, Luca/C-5719-2008; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015 OI van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Chmeissani, Mokhtar/0000-0002-2287-4791; Rancoita, Pier Giorgio/0000-0002-1990-4283; Kamyshkov, Yuri/0000-0002-3789-7152; Longo, Egidio/0000-0001-6238-6787; Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530; Bertucci, Bruna/0000-0001-7584-293X; Filthaut, Frank/0000-0003-3338-2247; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532 NR 23 TC 31 Z9 31 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 19 PY 1992 VL 294 IS 3-4 BP 457 EP 465 DI 10.1016/0370-2693(92)91548-N PG 9 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JZ672 UT WOS:A1992JZ67200024 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOSETI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARMINATI, F CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUGAS, A GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, R RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, W RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S AKBARI, H ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BLUMENFELD, B BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOSETI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BURQ, JP BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARMINATI, F CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUGAS, A GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, G HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MEINHOLZ, T MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, R RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, W RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SAJAN, E SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMIEMANN, K SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOPPER, H SCHOTANUS, DJ SHOTKIN, S SCHREIBER, HJ SHUKLA, J SCHULTE, R SCHULTE, S SCHULTZE, K SCHUTTE, J SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHUMILOV, E SHOUTKO, V SODERSTROM, E SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, QF WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC TI A MEASUREMENT OF TAU POLARIZATION IN Z0 DECAYS SO PHYSICS LETTERS B LA English DT Article ID OBSERVABLES; MODE AB The polarization of tau leptons produced in e+e- --> tau+tau- (gamma) is measured using a sample of 8977 tau+tau- pairs collected near the peak of the Z0 resonance. A polarization of -0.132 +/- 0.026 (stat.) +/- 0.021 (syst.) is determined. This corresponds to a ratio of the vector to the axial-vector coupling constants of the tau lepton to the weak neutral current of g(V)tau/g(Aeff)tau = 0.069 +/- 0.017. This leads to a value of the effective sin2theta(w) at the Z0 resonance of sin2theta(eff) = 0.2326 +/- 0.0043. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECHNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. INFN, SEZ NAPOLI, I-80125 NAPLES, ITALY. NAPLES UNIV, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. INFN, SEZ PERUGIA, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. WORLD LAB, FBLJA PROJECT, CH-1211 GENEVA 23, SWITZERLAND. SWISS FED INST TECHNOL, EIDGENOSS TECH HSCH, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. NUCL PHYS INST, ST PETERSBURG, USSR. BULGARIAN ACAD SCI, INST MECHATRON, BU-1113 SOFIA, BULGARIA. INFN, SEZ BOLOGNA, I-40126 BOLOGNA, ITALY. ITEP, MOSCOW 117259, USSR. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 3, W-5100 AACHEN, GERMANY. INFN, SEZ ROMA, I-00185 ROME, ITALY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. INFN, SEZ MILANO, I-20133 MILAN, ITALY. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. LAPP, CNRS, IN2P3, F-74941 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. NIKHEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. CATHOLIC UNIV NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. NIKHEF NIJMEGEN, 6525 ED NIJMEGEN, NETHERLANDS. UNIV CALIF, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, CNRS, IN2P3, F-69622 VILLEURBANNE, FRANCE. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. IHEP, BEIJING, PEOPLES R CHINA. USTC, ANHUI 230029, PEOPLES R CHINA. KOREA ADV INST SCI & TECHNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SIC, SHANGHAI, PEOPLES R CHINA. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), INFN, SEZ FIRGENZE, I-50125 FLORENCE, ITALY. RI Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Kamyshkov, Yuri/J-7999-2016; OI Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Chmeissani, Mokhtar/0000-0002-2287-4791; Rancoita, Pier Giorgio/0000-0002-1990-4283; Kamyshkov, Yuri/0000-0002-3789-7152; Filthaut, Frank/0000-0003-3338-2247 NR 34 TC 33 Z9 33 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. Lett. B PD NOV 19 PY 1992 VL 294 IS 3-4 BP 466 EP 478 DI 10.1016/0370-2693(92)91549-O PG 13 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JZ672 UT WOS:A1992JZ67200025 ER PT J AU HUSTON, P ESPENSON, JH BAKAC, A AF HUSTON, P ESPENSON, JH BAKAC, A TI REACTIONS OF THIYL RADICALS WITH TRANSITION-METAL COMPLEXES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ELECTRON-TRANSFER-REACTIONS; ABSOLUTE RATE CONSTANTS; PULSE-RADIOLYSIS; AQUEOUS-SOLUTION; ALKYL RADICALS; COBALT(II) MACROCYCLES; HYDROGEN-PEROXIDE; METHYL TRANSFER; OXIDATION; KINETICS AB Reactions of thiyl radicals (RS.) were studied in aqueous solution by laser flash photolysis. Alkyl radicals, which were used to generate the thiyl radicals, were produced by the photohomolysis of the cobalt-carbon bond of RCo([14]-aneN4)(H2O)2+ complexes (R = CH3, C2H5). These carbon-centered radicals abstract hydrogen atoms from thiols (C2H5SH, CysSH, or GSH), generating thiyl radicals. Thiyl radicals readily oxidize a variety of reduced transition-metal complexes. Kinetic and product studies were carried out, particularly for the ethylthiyl radical, to elucidate the mechanisms involved. Reactions of ethylthiyl radicals with inner-sphere reagents lead to metal-sulfur bond formation, and reactions with outer-sphere reagents produce thiolate ions and oxidized metal complexes. Ethylthiyl radicals also react with RML5(2+) complexes (M = Co or Cr; L = H2O or tetraazamacrocycles). When R = C2H5, the thiyl radicals abstract a beta-hydrogen atom, generating ethylene as a product. However, when R = CH3, the reaction is an S(H)2 substitution at carbon and C2H5SCH3 is formed. C1 IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. IOWA STATE UNIV SCI & TECHNOL, DEPT CHEM, AMES, IA 50011 USA. NR 90 TC 40 Z9 40 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 18 PY 1992 VL 114 IS 24 BP 9510 EP 9516 DI 10.1021/ja00050a033 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA JZ236 UT WOS:A1992JZ23600033 ER PT J AU FERNANDEZ, VL REIMER, JA DENN, MM AF FERNANDEZ, VL REIMER, JA DENN, MM TI MAGNETIC-RESONANCE STUDIES OF POLYPEPTIDES ADSORBED ON SILICA AND HYDROXYAPATITE SURFACES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID C-13 CHEMICAL-SHIFTS; ANGLE-SPINNING METHOD; POLY-L-LYSINE; SOLID-STATE; CONFORMATIONAL CHARACTERIZATION; GLASSY-POLYMERS; AMINO-ACIDS; NMR; ADSORPTION; MOTION AB Solid-state C-13 and H-2 nuclear magnetic resonance were used to reveal differences in conformation and local mobility between polypeptides in the bulk-solid and surface-adsorbed states. Carbon-13 chemical shifts show that the alpha-helical structures of longer chain solid poly-L-lysine and poly-L-glutamic acid are largely replaced by a more extended conformation upon adsorption. These shifts also identify specific side-chain functional group interactions with surface sites. Restriction of side-chain amino group rotation, revealed in H-2 NMR experiments, demonstrates the strength of these adsorbate-surface interactions. Measurements of C-13 rotating-frame spin-lock relaxation and cross-polarization dynamics indicate that, in general, both side-chain and backbone motions of adsorbed poly-L-lysine and poly-L-glutamic acid are diminished relative to the bulk-solid state. Taken together, these results suggest that the polypeptides adsorb in a flat, relatively extended conformation through strong electrostatic interactions of side-chain functional groups with the surface. This work demonstrates the effective use of conventional solid-state NMR analysis for studying conformational and motional behaviors of surface-adsorbed polymers. C1 LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 45 TC 41 Z9 41 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 18 PY 1992 VL 114 IS 24 BP 9634 EP 9642 DI 10.1021/ja00050a051 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA JZ236 UT WOS:A1992JZ23600051 ER PT J AU SCHMIDTRADDE, RH VOLLHARDT, KPC AF SCHMIDTRADDE, RH VOLLHARDT, KPC TI TOTAL SYNTHESIS OF ANGULAR [4]PHENYLENE AND [5]PHENYLENE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID COBALT-CATALYZED COCYCLIZATION; CYCLOHEXATRIENE RING; <3>PHENYLENE; HYDROCARBONS; CONJUGATION C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 29 TC 61 Z9 61 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD NOV 18 PY 1992 VL 114 IS 24 BP 9713 EP 9715 DI 10.1021/ja00050a091 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA JZ236 UT WOS:A1992JZ23600091 ER PT J AU FRIEDMANN, TA MCCARTY, KF KLAUS, EJ BOEHME, D CLIFT, WM JOHNSEN, HA MILLS, MJ OTTESEN, DK AF FRIEDMANN, TA MCCARTY, KF KLAUS, EJ BOEHME, D CLIFT, WM JOHNSEN, HA MILLS, MJ OTTESEN, DK TI CUBIC BORON-NITRIDE FORMATION ON SI (100) SUBSTRATES AT ROOM-TEMPERATURE BY PULSED LASER DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID FILMS; PLASMA AB We are studying the boron nitride system by using a pulsed excimer laser to ablate from hexagonal BN(hBN) targets to form BN films. We have deposited BN films on heated (600-degrees-C) and room-temperature silicon (100) surface in an ambient background gas of N2. Fourier transform infrared (FTIR) reflection spectroscopy indicates that the films grown at high temperature have short-range sp2 (hexagonal-like) order, whereas films grown at room temperature are a mixture of sp3-bonded BN and sp2 -bonded BN. Electron diffraction confirms the presence of cubic BN (cBN) material in the films grown at low temperature and the corresponding TEM lattice images show a grain size of approximately 200 angstrom. The presence of cBN in the films correlates with laser energy density, with cubic material appearing around 2.4 mJ/cm2. Auger electron spectroscopy (AES) indicates that the films are nitrogen deficient. RP FRIEDMANN, TA (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. RI McCarty, Kevin/F-9368-2012 OI McCarty, Kevin/0000-0002-8601-079X NR 12 TC 37 Z9 37 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 16 PY 1992 VL 61 IS 20 BP 2406 EP 2408 DI 10.1063/1.108179 PG 3 WC Physics, Applied SC Physics GA JY227 UT WOS:A1992JY22700010 ER PT J AU LUSH, GB MELLOCH, MR LUNDSTROM, MS LEVI, DH AHRENKIEL, RK MACMILLAN, HF AF LUSH, GB MELLOCH, MR LUNDSTROM, MS LEVI, DH AHRENKIEL, RK MACMILLAN, HF TI MICROSECOND LIFETIMES AND LOW INTERFACE RECOMBINATION VELOCITIES IN MODERATELY DOPED N-GAAS THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID MINORITY-CARRIER LIFETIME; INTERNAL QUANTUM EFFICIENCY; SURFACE-FREE GAAS; HETEROSTRUCTURES AB We have observed lifetimes greater than 1 mus in moderately doped, thin film, n-GaAs/Al0.3Ga0.7As double heterostructure membranes formed by etching away the substrate. We attribute these ultralong lifetimes to enhanced photon recycling caused by the removal of the substrate. Nonradiative recombination in the bulk and at the interfaces is very low; the upper limit of the interface recombination velocity is 25 cm/s. Such long lifetimes in GaAs doped at N(D) = 1.3 X 10(17) cm-3 suggest that thin-film solar cells offer a potential option for achieving very high efficiencies. C1 NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401. VARIAN RES CTR,PALO ALTO,CA 94303. RP LUSH, GB (reprint author), PURDUE UNIV,SCH ELECT ENGN,W LAFAYETTE,IN 47907, USA. NR 20 TC 20 Z9 20 U1 0 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 16 PY 1992 VL 61 IS 20 BP 2440 EP 2442 DI 10.1063/1.108190 PG 3 WC Physics, Applied SC Physics GA JY227 UT WOS:A1992JY22700022 ER PT J AU VITTUR, F TUNIZ, C PAOLETTI, S RIZZO, R JONES, KW AF VITTUR, F TUNIZ, C PAOLETTI, S RIZZO, R JONES, KW TI ELEMENTAL ANALYSIS OF GROWTH PLATE CARTILAGE BY SYNCHROTRON-RADIATION-INDUCED X-RAY-EMISSION (SRIXE) SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID EPIPHYSEAL CARTILAGE; ALKALINE-PHOSPHATASE; CHICK; CALCIFICATION; MATRIX C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP VITTUR, F (reprint author), UNIV TRIESTE,DIPARTIMENTO BIOCHIM,VIA A VALERIO 38,I-34127 TRIESTE,ITALY. FU NCRR NIH HHS [P41RR01838] NR 18 TC 7 Z9 7 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 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD NOV 16 PY 1992 VL 188 IS 3 BP 1010 EP 1017 DI 10.1016/0006-291X(92)91332-K PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JY446 UT WOS:A1992JY44600008 PM 1445337 ER PT J AU LIN, S VANAMERONGEN, H STRUVE, WS AF LIN, S VANAMERONGEN, H STRUVE, WS TI ULTRAFAST PUMP-PROBE SPECTROSCOPY OF THE P700-CONTAINING AND FX-CONTAINING PHOTOSYSTEM-I CORE PROTEIN FROM SYNECHOCOCCUS SP PCC-6301 (ANACYSTIS-NIDULANS) SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE ANTENNA; CHLOROPHYLL-A; CYANOBACTERIUM; PHOTOSYSTEM-I; PUMP-PROBE SPECTROSCOPY; ULTRAFAST SPECTROSCOPY; (SYNECHOCOCCUS) ID TIME-RESOLVED FLUORESCENCE; ABSORPTION-SPECTROSCOPY; SPINACH-CHLOROPLASTS; EXCITATION TRANSPORT; A-PROTEIN; PARTICLES; ANTENNA; P-700; COMPLEX; GREEN AB Time-resolved absorption difference profiles were obtained using one-color and two-color pump-probe techniques on the P700-containing core protein from the blue-green bacterium Synechococcus sp. PCC 6301, which contains approx. 100 chlorophyll (Chl) a antenna pigments per reaction center. Excitation wavelengths in the two-color studies were 665 and 680 nm; probe wavelengths ranged from 650 to 676 nm. The isotropic absorption difference spectra show evidence for rapid equilibration among Chl a spectral forms in the core antenna. In addition, they exhibit a dynamic blue shift with lifetime approximately 9-14 ps, which occurs irrespective of excitation wavelength. Analyses of isotropic profiles for different combinations of pump and probe wavelengths yield four families of lifetime components: < 5 ps, which is attributed to spectral equilibration; 9-14 ps; several tens of ps (observed at wavelengths longer than 665 nm); and at least several hundred ps (observed at probe wavelengths 650 and 657 nm under 665 nm excitation). Anisotropic decays observed with identical pump and probe wavelengths exhibit large-amplitude components with easily resolved lifetimes (approximately 15 ps and approximately 7 ps at 665 and 670 nm, respectively). The initial anisotropies are < 0.4, indicating that much faster depolarization processes also occur in these one-color experiments. The two-color anisotropy functions tend to be dominated by unresolvably fast decay, suggesting that mainstream energy transfer steps in the core antenna occur on a subpicosecond time scale. C1 IOWA STATE UNIV SCI & TECHNOL,USDOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RI van Amerongen, Herbert/J-9483-2016 OI van Amerongen, Herbert/0000-0002-9783-2895 NR 28 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD NOV 16 PY 1992 VL 1140 IS 1 BP 6 EP 14 DI 10.1016/0005-2728(92)90013-R PG 9 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JY602 UT WOS:A1992JY60200002 ER PT J AU BRITT, RD LORIGAN, GA SAUER, K KLEIN, MP ZIMMERMANN, JL AF BRITT, RD LORIGAN, GA SAUER, K KLEIN, MP ZIMMERMANN, JL TI THE G = 2 MULTILINE EPR SIGNAL OF THE S2 STATE OF THE PHOTOSYNTHETIC OXYGEN-EVOLVING COMPLEX ORIGINATES FROM A GROUND SPIN STATE SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Note DE PHOTOSYSTEM-II; OXYGEN-EVOLVING COMPLEX; MANGANESE; EPR; PULSED; ELECTRON SPIN ECHO ID ELECTRON-PARAMAGNETIC-RES; PHOTOSYSTEM-II; O-2-EVOLVING COMPLEX; MAGNETIC-PROPERTIES; MANGANESE; SATURATION; EVOLUTION; ENZYME; ECHO; MN AB The amplitude of the g = 2 Mn 'multiline' EPR signal of the S2 state of the photosynthetic oxygen-evolving complex varies inversely with temperature, indicating that this signal arises from a ground spin state. Electron spin echo experiments at temperatures of 4.2 K and 1.4 K show such Curie-law behavior of the g = 2 multiline EPR signal, as do continuous-wave EPR experiments performed at a non-saturating microwave power in the range from 15.0 K to 4.2 K. C1 LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. CENS,DEPT BIOL CELLULAIRE & MOLEC,BIOENERGET SECT,CNRS,URA 1290,F-91190 GIF SUR YVETTE,FRANCE. RP BRITT, RD (reprint author), UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616, USA. FU NIGMS NIH HHS [BMT 1 R29 GM48242-01] NR 26 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD NOV 16 PY 1992 VL 1140 IS 1 BP 95 EP 101 DI 10.1016/0005-2728(92)90024-V PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JY602 UT WOS:A1992JY60200013 PM 1329981 ER PT J AU DOREY, N MAVROMATOS, NE AF DOREY, N MAVROMATOS, NE TI QED3 AND 2-DIMENSIONAL SUPERCONDUCTIVITY WITHOUT PARITY VIOLATION SO NUCLEAR PHYSICS B LA English DT Article ID CHIRAL-SYMMETRY-BREAKING; HIGH-TC SUPERCONDUCTORS; CHERN-SIMONS TERM; HIGH-TEMPERATURE SUPERCONDUCTIVITY; DOPED PLANAR ANTIFERROMAGNET; NONLINEAR SIGMA-MODEL; GAUGE-FIELD-THEORIES; FINITE TEMPERATURE; CU-O; 2+1 DIMENSIONS AB We investigate a recently proposed parity-invariant model of two-dimensional superconductivity. The model consists of two-species of fermions coupled with opposite sign to an abelian gauge field and is closely related to QED3. The first part of the paper is devoted to a detailed analysis of the relevant properties of QED3. In particular we study the dynamical generation of a parity-conserving fermion mass and the finite-temperature symmetry restoration transition. We show how the parity-invariant model arises as an effective long-wavelength theory of the dynamics of holes in a two-dimensional quantum antiferromagnet. The model exhibits type-II superconductivity without parity or time-reversal symmetry violation, a high value of 2DELTA/k(B)T(c), flux quantization with quantum hc/2e and a two-dimensional Meissner effect. We discuss the possible relevance of this model to the high-T(c) superconductors. C1 CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. RP DOREY, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,MS B285,LOS ALAMOS,NM 87545, USA. NR 95 TC 199 Z9 200 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD NOV 16 PY 1992 VL 386 IS 3 BP 614 EP 680 DI 10.1016/0550-3213(92)90632-L PG 67 WC Physics, Particles & Fields SC Physics GA KD065 UT WOS:A1992KD06500005 ER PT J AU CEREZO, A HYDE, JM MILLER, MK PETTS, SC SETNA, RP SMITH, GDW AF CEREZO, A HYDE, JM MILLER, MK PETTS, SC SETNA, RP SMITH, GDW TI ATOMISTIC MODELING OF DIFFUSIONAL PHASE-TRANSFORMATIONS SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article AB A simple Monte Carlo model has been used to simulate diffusional phase transformations occurring in binary alloys during thermal ageing. The results of the simulation are compared directly with atomic-scale chemical information obtained from position-sensitive atom probe microanalysis. A simple pair potential model is found to give a good match with the ageing behaviour of spindodally decomposing iron-chromium alloys. Initial results on the modelling of nucleation and growth are presented, and compared with phase separation of copper-cobalt alloys. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP CEREZO, A (reprint author), UNIV OXFORD,DEPT MAT,PARKS RD,OXFORD OX1 3PH,ENGLAND. NR 10 TC 16 Z9 16 U1 0 U2 2 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 0962-8428 J9 PHILOS T ROY SOC A JI Philos. Trans. R. Soc. Lond. Ser. A-Math. Phys. Eng. Sci. PD NOV 16 PY 1992 VL 341 IS 1661 BP 313 EP 326 DI 10.1098/rsta.1992.0104 PG 14 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JY844 UT WOS:A1992JY84400019 ER PT J AU ANJOS, JC APPEL, JA BEAN, A BEDIAGA, I BRACKER, SB BROWDER, TE CREMALDI, LM DUBOSCQ, JE ELLIOT, JR ESCOBAR, CO GIBNEY, MC HARTNER, GF KARCHIN, PE KUMAR, BR LIMA, JGR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T PINFOLD, J PUNKAR, G PUROHIT, MV ROSS, WR SANTORO, AFS SHOUP, AL SLIWA, K SOKOLOFF, MD SOUZA, MHG SPALDING, WJ STREETMAN, ME STUNDZIA, AB WITHERELL, MS AF ANJOS, JC APPEL, JA BEAN, A BEDIAGA, I BRACKER, SB BROWDER, TE CREMALDI, LM DUBOSCQ, JE ELLIOT, JR ESCOBAR, CO GIBNEY, MC HARTNER, GF KARCHIN, PE KUMAR, BR LIMA, JGR LOSTY, MJ LUSTE, GJ MANTSCH, PM MARTIN, JF MCHUGH, S MENARY, SR MORRISON, RJ NASH, T PINFOLD, J PUNKAR, G PUROHIT, MV ROSS, WR SANTORO, AFS SHOUP, AL SLIWA, K SOKOLOFF, MD SOUZA, MHG SPALDING, WJ STREETMAN, ME STUNDZIA, AB WITHERELL, MS TI STUDY OF THE DOUBLY CABIBBO-SUPPRESSED DECAY D+ -]PHI-K+ AND THE SINGLY CABIBBO-SUPPRESSED DECAY D(S)+ -]PHI-K+ SO PHYSICAL REVIEW LETTERS LA English DT Article AB We have searched for the doubly Cabibbo-suppressed decay D+/- --> phiK+/- and the singly Cabibbo-suppressed decay D(s)+/- --> phiK+/- in data from the Fermilab photoproduction experiment E691. The D+/-decay mode is of particular interest because it cannot result from simple spectator decay. We observe a D+/- signal corresponding to a branching ratio of B(D+/- --> phiK+/-) = (3.3(-1.5)+1.8 +/- 0.8) x 10(-4). In the D(s)+/-mode we measure an upper limit B(D(s)+/- --> phiK+/-) < 0.2%. C1 UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. CARLETON UNIV,OTTAWA K1S 5B6,ONTARIO,CANADA. UNIV COLORADO,BOULDER,CO 80309. FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. UNIV SAO PAULO,SAO PAULO,BRAZIL. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. YALE UNIV,NEW HAVEN,CT 06511. UNIV MISSISSIPPI,OXFORD,MS 38677. PRINCETON UNIV,PRINCETON,NJ 08544. UNIV CINCINNATI,CINCINNATI,OH 45221. RP ANJOS, JC (reprint author), CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. RI Anjos, Joao/C-8335-2013 NR 8 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 16 PY 1992 VL 69 IS 20 BP 2892 EP 2895 DI 10.1103/PhysRevLett.69.2892 PG 4 WC Physics, Multidisciplinary SC Physics GA JY164 UT WOS:A1992JY16400004 ER PT J AU ABE, F AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SPIES, A SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSENG, J TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WU, D WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZUCCHELLI, S AF ABE, F AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BIERY, K BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, GM GRINDLEY, R GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KORDAS, K KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SGANOS, G SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SPIES, A SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TSENG, J TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WU, D WYSS, J YAGIL, A YASUOKA, K YE, Y YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZUCCHELLI, S TI DIJET ANGULAR-DISTRIBUTION IN P(P)OVER-BAR COLLISIONS AT ROOT-S=1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID INCLUSIVE CROSS-SECTION; PPBAR COLLIDER; JET; QUARKS; GLUONS AB The dijet angular distribution is measured in the Collider Detector at Fermilab. This measurement covers higher mass ranges and larger scattering angles than previously possible. Good agreement is observed between the data and both leading order [O(alpha(s)2)] and next-to-leading order [O(alpha(s)3)] QCD calculations. A limit on quark compositeness of LAMBDA(c) > 1.0 TeV is obtained. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. BRANDEIS UNIV, WALTHAM, MA 02254 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. DUKE UNIV, DURHAM, NC 27706 USA. FERMI NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, FRASCATI, ITALY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV ILLINOIS, URBANA, IL 61801 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. MIT, CAMBRIDGE, MA 02139 USA. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. UNIV PADUA, IST NAZL FIS NUCL, SEZ PADOVA, I-35131 PADUA, ITALY. UNIV PENN, PHILADELPHIA, PA 19104 USA. UNIV PISA, IST NAZL FIS NUCL, I-56100 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. ROCKEFELLER UNIV, NEW YORK, NY 10021 USA. RUTGERS STATE UNIV, PISCATAWAY, NJ 08854 USA. TEXAS A&M UNIV SYST, COLLEGE STN, TX 77843 USA. UNIV TSUKUBA, TSUKUBA, IBARAKI 305, JAPAN. TUFTS UNIV, MEDFORD, MA 02155 USA. UNIV WISCONSIN, MADISON, WI 53706 USA. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS, TSUKUBA, IBARAKI 305, JAPAN. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052; NR 15 TC 26 Z9 26 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 16 PY 1992 VL 69 IS 20 BP 2896 EP 2900 DI 10.1103/PhysRevLett.69.2896 PG 5 WC Physics, Multidisciplinary SC Physics GA JY164 UT WOS:A1992JY16400005 ER PT J AU WANG, F WU, GH TENG, LJ GOLDMAN, T AF WANG, F WU, GH TENG, LJ GOLDMAN, T TI QUARK DELOCALIZATION, COLOR SCREENING, AND NUCLEAR INTERMEDIATE RANGE ATTRACTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID MODEL AB We consider the effect on baryon-baryon potentials and phase shifts of including quark delocalization and color screening in the nonrelativistic quark cluster model. We find that the inclusion of these additional effects allows a good qualitative description of both. C1 CHINESE CTR ADV SCI & TECHNOL,WORLD LAB,BEIJING,PEOPLES R CHINA. SICHUAN UNIV,INST NUCL SCI & TECHNOL,CHENGDU 610064,PEOPLES R CHINA. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP WANG, F (reprint author), NANJING UNIV,CTR THEORET PHYS,NANJING 210008,PEOPLES R CHINA. NR 13 TC 116 Z9 131 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 16 PY 1992 VL 69 IS 20 BP 2901 EP 2904 DI 10.1103/PhysRevLett.69.2901 PG 4 WC Physics, Multidisciplinary SC Physics GA JY164 UT WOS:A1992JY16400006 ER PT J AU OTTAVIANI, M KROMMES, JA AF OTTAVIANI, M KROMMES, JA TI WEAK-TURBULENCE AND STRONG-TURBULENCE REGIMES OF THE FORCED HASEGAWA-MIMA EQUATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID DRIFT-WAVE TURBULENCE; SPECTRA; BEHAVIOR; PLASMA AB A Kolmogorov-type analysis of the energy- and enstrophy-cascading ranges of a forced Hasegawa-Mima equation allows one to derive a criterion for the threshold of the transition between the weak-turbulence and the strong-turbulence regimes. Contrary to general belief, it is found that due to the inverse energy cascade the large-scale portion of the inertial range is in the strong-turbulence regime in the limit of infinite Reynolds-like numbers for any finite amount of forcing. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. NR 20 TC 31 Z9 31 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 16 PY 1992 VL 69 IS 20 BP 2923 EP 2926 DI 10.1103/PhysRevLett.69.2923 PG 4 WC Physics, Multidisciplinary SC Physics GA JY164 UT WOS:A1992JY16400012 ER PT J AU CHOW, PC JIANG, X REITER, G WOCHNER, P MOSS, SC AXE, JD HANSON, JC MCMULLAN, RK MENG, RL CHU, CW AF CHOW, PC JIANG, X REITER, G WOCHNER, P MOSS, SC AXE, JD HANSON, JC MCMULLAN, RK MENG, RL CHU, CW TI SYNCHROTRON X-RAY STUDY OF ORIENTATIONAL ORDER IN SINGLE-CRYSTAL C-60 AT ROOM-TEMPERATURE SO PHYSICAL REVIEW LETTERS LA English DT Article ID TRANSITION AB Synchrotron x-ray Bragg intensities from a C60 single crystal were used to evaluate the nonuniform atomic density distribution on a C60 sphere at 300 K. Coefficients of the symmetry-adapted spherical harmonics up to l = 18 are required with a resulting density deficiency of approximately 16% in [111] directions and four lobes of approximately 10% excess about [110]. The results are discussed in terms of an effective potential which a single C60 sees in the cubic field of its neighbors. Initial calculations give a maximum rotational potential barrier height of about 2kT or approximately 600 K. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77204. RP CHOW, PC (reprint author), UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204, USA. RI Hanson, jonathan/E-3517-2010 NR 24 TC 124 Z9 124 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 16 PY 1992 VL 69 IS 20 BP 2943 EP 2946 DI 10.1103/PhysRevLett.69.2943 PG 4 WC Physics, Multidisciplinary SC Physics GA JY164 UT WOS:A1992JY16400017 ER PT J AU SHIRLEY, EL ZHU, XJ LOUIE, SG AF SHIRLEY, EL ZHU, XJ LOUIE, SG TI CORE POLARIZATION IN SEMICONDUCTORS - EFFECTS ON QUASI-PARTICLE ENERGIES SO PHYSICAL REVIEW LETTERS LA English DT Article ID NORM-CONSERVING PSEUDOPOTENTIALS; BAND-GAPS; EXCHANGE; INSULATORS; POTENTIALS; ELECTRON; SILICON; POINTS AB We study core-valence interactions in several technologically important semiconductors. We compute band structures treating many-body effects in Hedin's GW approximation. The core-valence correlation and core polarization are treated using a core-polarization-potential formulation instead of standard, less reliable, mean-field approaches. This is critical for materials with shallow cores (Ge, GaAs), where mean-field treatments of core-valence interactions bias certain band gaps by up to 0.4 eV. The core-polarization potential formulation may be used in either frozen-core all-electron or pseudopotential calculations, since it deals only with core-valence many-body effects. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. NR 33 TC 34 Z9 34 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 16 PY 1992 VL 69 IS 20 BP 2955 EP 2958 DI 10.1103/PhysRevLett.69.2955 PG 4 WC Physics, Multidisciplinary SC Physics GA JY164 UT WOS:A1992JY16400020 ER PT J AU LINK, B BAYM, G AF LINK, B BAYM, G TI HYDRODYNAMIC TRANSPORT OF EXCITONS IN SEMICONDUCTORS AND BOSE-EINSTEIN CONDENSATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID CU2O; PARAEXCITONS; GAS AB We study the expansion of an exciton gas against lattice drag, describe the transition between the diffusive and low-drag hydrodynamic regimes, and compare with experimental data obtained at exciton densities and temperatures near the Bose-Einstein phase boundary. As we show through numerical simulation, the rapid expansion of the exciton cloud seen experimentally at high exciton densities can be explained as drag-free hydrodynamic flow. Such a reduction in drag strongly suggests that Bose-Einstein condensation has occurred and that excitonic superfluidity is being observed. C1 UNIV ILLINOIS,LOOMIS LAB PHYS,URBANA,IL 61801. RP LINK, B (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 29 Z9 29 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD NOV 16 PY 1992 VL 69 IS 20 BP 2959 EP 2962 DI 10.1103/PhysRevLett.69.2959 PG 4 WC Physics, Multidisciplinary SC Physics GA JY164 UT WOS:A1992JY16400021 ER PT J AU VARACALLE, DJ HERMAN, H BANCKE, GA RIGGS, WL AF VARACALLE, DJ HERMAN, H BANCKE, GA RIGGS, WL TI VACUUM PLASMA SPRAYED ALUMINA TITANIA COATINGS 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 AB Vacuum plasma spraying is gaining acceptance as a source of high quality coatings for many materials on a wide range of substrates. The process produces coatings that exhibit excellent wear, corrosion resistance and high-temperature behavior. In this study, alumina-titania powder was deposited on graphite using controlled vacuum spraying to minimize the porosity of the sprayed ceramic. Experiments were conducted using a statistical, fractional factorial design parametric study. Operating parameters were varied around the typical spray parameters in a Taguchi design of experiments to display the range of plasma processing conditions and their effect on the measured coating characteristics. The Taguchi design evaluated the effect of three plasma processing variables on the measured response: current, primary gas flow and secondary gas flow. The coating qualities evaluated were thickness, porosity, surface roughness and microhardness. This paper discusses the influence of processing parameters on as-sprayed coating qualities. The best coatings were produced with a high power setting and a high ratio of secondary gas flow to the total gas flow. The paper also discusses the effect of thermal cycling on ceramic samples in an inert atmosphere (i.e. helium). Results indicated no degradation of the coating. A vacuum plasma sprayed ceramic coating was applied to graphite to demonstrate the feasibility of using the coating to protect graphite from oxidation. C1 SUNY STONY BROOK,DEPT MAT SCI,STONY BROOK,NY 11794. TUBALCAIN CO,LOVELAND,OH 45140. RP VARACALLE, DJ (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN,IDAHO FALLS,ID 83415, USA. NR 8 TC 9 Z9 9 U1 1 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV 16 PY 1992 VL 54 IS 1-3 BP 19 EP 24 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA585 UT WOS:A1992KA58500005 ER PT J AU HSIEH, JH HOCHMAN, RF AF HSIEH, JH HOCHMAN, RF TI IMPURITIES IN ION PLATED CHROMIUM FILMS 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 DEPOSITION; BOMBARDMENT; BEAMS AB Oxygen, carbon and argon concentrations in chromium films produced by triode ion plating were studied as a function of substrate bias and cathode current density (or ion flux). The results reveal the following. (1) Ion plating with low bias and high ion flux can produce films with low oxygen and carbon concentrations. (2) At high bias, the effect of energetic particle bombardment on decreasing oxygen and carbon concentrations is not as effective as in low bias ion plating. (3) The amount of argon entrapped in the films increases with the increase in bias voltage and bombarding particle flux. A qualitative model based on the theory of energetic particle bombardment is used to explain the results. C1 GEORGIA INST TECHNOL,SCH MAT ENGN,ATLANTA,GA 30332. RP HSIEH, JH (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 14 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD NOV 16 PY 1992 VL 54 IS 1-3 BP 315 EP 319 DI 10.1016/0257-8972(92)90180-I PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA585 UT WOS:A1992KA58500051 ER PT J AU JANKOWSKI, AF SCHRAWYER, LR AF JANKOWSKI, AF SCHRAWYER, LR TI WORKING GAS-PRESSURE AND FLOW EFFECTS ON REACTIVELY SPUTTERED MOLYBDENUM OXIDE THIN-FILMS 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 AB The microstructure and composition of reactively sputtered, molybdenum oxide thin films are found to be especially sensitive to the working gas pressure and flow conditions. The variations in composition and crystallographic texture of nominal Mo2O3 films are studied, as formed at low pressure (less than 5 mTorr) and flow (less than 25 cm3 min-1) conditions, using Auger electron spectroscopy and X-ray diffraction. The structure and composition of the Mo2O3 films are categorized as part of a continuous series of molybdenum oxide compounds based on a body centered tetragonal unit cell. RP JANKOWSKI, AF (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 11 TC 6 Z9 6 U1 0 U2 5 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 349 EP 354 DI 10.1016/0257-8972(92)90187-F PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA KA585 UT WOS:A1992KA58500058 ER PT J AU LYKKE, KR PARKER, DH WURZ, P HUNT, JE PELLIN, MJ GRUEN, DM HEMMINGER, JC LATTIMER, RP AF LYKKE, KR PARKER, DH WURZ, P HUNT, JE PELLIN, MJ GRUEN, DM HEMMINGER, JC LATTIMER, RP TI MASS-SPECTROMETRIC ANALYSIS OF RUBBER VULCANIZATES BY LASER DESORPTION LASER IONIZATION SO ANALYTICAL CHEMISTRY LA English DT Article ID SINGLE-PHOTON IONIZATION; MULTIPHOTON IONIZATION; ULTRAVIOLET-LASER; POLYMER ADDITIVES; ORGANIC POLYMERS; PHOTOABLATION; SPECTROSCOPY; MECHANISMS; ABLATION; SURFACES AB Three different vulcanized rubbers have been studied by laser desorption/laser ionization man spectrometry. Analysis of these vulcanizates by various conventional mass spectrometric methods has been difficult because of the complexity of their mass spectra. The major thrust of the present work is to show that different wavelengths for the postionization step allow selectivity which provides important additional information about the chemical makeup of these complex materials. Near-UV wavelengths selectivity ionize aromatic additives, far-UV wavelengths photoionize other nonaromatic species, and VUV wavelengths access all of the desorbed species. The ability to vary these different parameters allows a specificity that rivals other techniques for surface and bulk analysis of polymers and their additives. C1 UNIV CALIF IRVINE,DEPT CHEM,IRVINE,CA 92717. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. BF GOODRICH CO,CTR RES & DEV,BRECKSVILLE,OH 44141. RP LYKKE, KR (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 32 TC 20 Z9 20 U1 0 U2 2 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 2797 EP 2803 DI 10.1021/ac00046a024 PG 7 WC Chemistry, Analytical SC Chemistry GA JY171 UT WOS:A1992JY17100024 ER PT J AU HOGAN, BL YEUNG, ES AF HOGAN, BL YEUNG, ES TI DETERMINATION OF INTRACELLULAR SPECIES AT THE LEVEL OF A SINGLE ERYTHROCYTE VIA CAPILLARY ELECTROPHORESIS WITH DIRECT AND INDIRECT FLUORESCENCE DETECTION SO ANALYTICAL CHEMISTRY LA English DT Article ID TUBULAR LIQUID-CHROMATOGRAPHY; ZONE ELECTROPHORESIS; DIAMETER COLUMNS; CELLS; GLUTATHIONE; SEPARATIONS; NEURONS AB Intracellular contents reflect the specific history of a cell including innate physiological heterogeneity as well as differing levels of exposure to environmental influences. A method capable of analyzing a variety of species from within a single human erythrocyte is demonstrated. Guided by a microscope, individual cells can be drawn into open capillaries of 10-mum i.d. On contact with a low ionic strength buffer solution, the cell lyses and releases its intracellular fluid. The ionic components are then separated by capillary electrophoresis. For glutathione, microderivatization with a fluorescent reagent can be accomplished in vitro with monobromobimane. The effects of extracellular oxidizing and reducing agents on the glutathione levels can thus be followed. For sodium and potassium or any other ionic species, charge displacement of a fluorescent cation results in indirect fluorescence detection. The two detection modes are suitable for intracellular components present at low-attomole and sub-femtomole levels, respectively. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 40 TC 218 Z9 224 U1 1 U2 15 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 2841 EP 2845 DI 10.1021/ac00046a031 PG 5 WC Chemistry, Analytical SC Chemistry GA JY171 UT WOS:A1992JY17100031 PM 1294009 ER PT J AU LAINTZ, KE WAI, CM YONKER, CR SMITH, RD AF LAINTZ, KE WAI, CM YONKER, CR SMITH, RD TI EXTRACTION OF METAL-IONS FROM LIQUID AND SOLID MATERIALS BY SUPERCRITICAL CARBON-DIOXIDE SO ANALYTICAL CHEMISTRY LA English DT Note C1 UNIV IDAHO, DEPT CHEM, MOSCOW, ID 83843 USA. PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 6 TC 232 Z9 244 U1 1 U2 13 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 2875 EP 2878 DI 10.1021/ac00046a039 PG 4 WC Chemistry, Analytical SC Chemistry GA JY171 UT WOS:A1992JY17100039 ER PT J AU MOORE, KL MORONNE, MM MEHLHORN, RJ AF MOORE, KL MORONNE, MM MEHLHORN, RJ TI ELECTRON-SPIN-RESONANCE STUDY OF PEROXIDASE-ACTIVITY AND KINETICS SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID HYDROGEN-PEROXIDE; HORSERADISH-PEROXIDASE; THYROID PEROXIDASE; FREE-RADICALS; COMPOUND-III; LACTOPEROXIDASE; SUPEROXIDE; ENZYME; INACTIVATION; NITROXIDES C1 LAWRENCE BERKELEY LAB,DIV ENERGY & ENVIRONM,M-S 70-193A,1 CYCLOTRON RD,BERKELEY,CA 94720. FU NIA NIH HHS [AG 04818] NR 26 TC 23 Z9 23 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 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD NOV 15 PY 1992 VL 299 IS 1 BP 47 EP 56 DI 10.1016/0003-9861(92)90242-O PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JV613 UT WOS:A1992JV61300007 PM 1332617 ER PT J AU SUGIHARA, K SUGIHARA, T MOHANDAS, N HEBBEL, RP AF SUGIHARA, K SUGIHARA, T MOHANDAS, N HEBBEL, RP TI THROMBOSPONDIN MEDIATES ADHERENCE OF CD36+ SICKLE RETICULOCYTES TO ENDOTHELIAL-CELLS SO BLOOD LA English DT Article ID ARG-GLY-ASP; VASCULAR ENDOTHELIUM; ERYTHROCYTE ADHERENCE; VONWILLEBRAND-FACTOR; PARASITIZED ERYTHROCYTES; VITRONECTIN RECEPTOR; PLASMA-PROTEINS; CONTROLLED FLOW; ADHESION; MEMBRANE C1 UNIV MINNESOTA,SCH MED,DEPT MED,BOX 480 UMHC,HARVARD ST & E RIVER RD,MINNEAPOLIS,MN 55455. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. FU NHLBI NIH HHS [HL30160, HL31579] NR 42 TC 156 Z9 156 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1992 VL 80 IS 10 BP 2634 EP 2642 PG 9 WC Hematology SC Hematology GA JY677 UT WOS:A1992JY67700026 PM 1384794 ER PT J AU LYNCH, AM KNIZE, MG BOOBIS, AR GOODERHAM, NJ DAVIES, DS MURRAY, S AF LYNCH, AM KNIZE, MG BOOBIS, AR GOODERHAM, NJ DAVIES, DS MURRAY, S TI INTRAINDIVIDUAL AND INTERINDIVIDUAL VARIABILITY IN SYSTEMIC EXPOSURE IN HUMANS TO 2-AMINO-3,8-DIMETHYLIMIDAZO[4,5-F]QUINOXALINE AND 2-AMINO-1-METHYL-6-PHENYLIMIDAZO[4,5-B]PYRIDINE, CARCINOGENS PRESENT IN COOKED BEEF SO CANCER RESEARCH LA English DT Article ID FOOD MUTAGEN 2-AMINO-1-METHYL-6-PHENYLIMIDAZO<4,5-B>PYRIDINE; METABOLIC-ACTIVATION; LIVER-MICROSOMES; RAT-LIVER; HAMSTER HEPATOCYTES; HETEROCYCLIC AMINES; MASS-SPECTROMETRY; PYRIDINE PHIP; MEIQX; INDUCTION AB During the cooking of beef, the genotoxic heterocyclic aromatic amines 2-amino-3,8-dimethylimidazo[4,5-f]quinoxaline (MeIQx), 2-amino-3,4,8-trimethylimidazo[4,5-f]quinoxaline (DiMeIQx), and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) are formed. Little is known about the fate of these compounds in humans or the factors affecting it. We have developed assays based on capillary column gas chromatography-negative ion mass spectrometry capable of the simultaneous measurement of MeIQx, DiMeIQx, and PhIP in cooked meat and in human urine using stable isotope labeled analogues. Ten normal, healthy male volunteers were invited to consume a standard cooked meat meal (400-450 g lean beef, cooked as patties on a griddle hotplate) on four separate occasions over a period of 14 months. Following consumption of the test meals, urine was collected from 0 to 8 h, during which time all free amines were excreted and analyzed for MeIQx, DiMeIQx, and PhIP. Subjects ingested 240 +/- 9 (SEM) g cooked meat, which contained 2.2 +/- 0.2 ng MeIQx/g meat, 0.7 +/- 0.1 ng DiMeIQx/g meat, and 16.4 +/- 2.1 ng PhIP/g meat. The variability in relative systemic bioavailability was assessed from the percentage of ingested amine excreted unchanged in the urine. Subjects excreted 2.1 +/- 1.1% of MeIQx and 1.1 +/- 0.5% of PhIP ingested as unchanged amine in the urine. Levels of DiMeIQx in urine, if present, were below the sensitivity of our assay (20 pg/ml) and could not be detected in any of the samples analyzed. Irrespective of dose, urinary excretion of unchanged MeIQx or PhIP (expressed as a percentage of the ingested dose) remained constant for each individual subject. The intraindividual coefficients of variation for MeIQx (28.4%) and PhIP (23.7%) were low and the pooled interday (intrasubject) coefficients of variation for both compounds were only 19 and 3.4%, respectively. In contrast, intersubject (intraday) variation was greater, with pooled coefficients of variation of 145% for MeIQx and 71% for PhIP. Based on these studies, it should be possible to use the percentage excretion of MeIQx and PhIP to assess the relative bioavailability of these compounds in humans. C1 LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. LAWRENCE LIVERMORE NATL LAB,DIV ENVIRONM SCI,LIVERMORE,CA 94550. RP LYNCH, AM (reprint author), ROYAL POSTGRAD MED SCH,DEPT CLIN PHARMACOL,DUCANE RD,LONDON W12 0NN,ENGLAND. FU NCI NIH HHS [R01-CA40811, CA40895-02]; NIEHS NIH HHS [22YO1-ES-10063] NR 52 TC 128 Z9 129 U1 2 U2 4 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA 615 CHESTNUT ST, 17TH FLOOR, PHILADELPHIA, PA 19106-4404 USA SN 0008-5472 J9 CANCER RES JI Cancer Res. PD NOV 15 PY 1992 VL 52 IS 22 BP 6216 EP 6223 PG 8 WC Oncology SC Oncology GA JX754 UT WOS:A1992JX75400013 PM 1423264 ER PT J AU BOEHM, RC BANERJEE, A AF BOEHM, RC BANERJEE, A TI ABINITIO STUDY OF THE OXIDES OF RHENIUM AND THEIR ANIONS SO CHEMICAL PHYSICS LA English DT Article ID EFFECTIVE CORE POTENTIALS; MOLECULAR CALCULATIONS; OXYGEN; ATOMS AB Ab initio molecular orbital calculations were used to study the properties of gas phase rhenium oxides in order to gain a better understanding of some of the issues related to the surface ionization of perrhenate anions (ReO4-) from a hot Ba (ReO4)/Nd2O3 surface. The ground state of the anion was found to be tetrahedral, with a bond length of 1.885 angstrom, at the UHF/LANL1DZ* level. Several geometric linkages of its corresponding neutral were considered, including some fragments. At the UHF/LANL1DZ* level, it was determined that ReO4 neutral could be viewed as an adduct of two oxygen atoms onto a linear ReO2 backbone. The energy of ReO4-, ReO4, ReO2, O2, and O equilibrium structures were then determined at the MP4SDTQ/LANL1DZ* level. It was found that ReO4 neutral is stable by 3 eV with respect to ReO2 + 2O, and its electron affinity was determined to be between 2.4 and 5.0 eV, which is in acceptable agreement with the results of Gould and Miller who approximated this quantity from thermochemical data to be 4.5 eV. C1 EG&G IDAHO INC,IDAHO NATL ENGN LAB,THEORY PROJECT,POB 1625,IDAHO FALLS,ID 83415. NR 19 TC 3 Z9 3 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD NOV 15 PY 1992 VL 167 IS 3 BP 291 EP 297 DI 10.1016/0301-0104(92)80203-8 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KD850 UT WOS:A1992KD85000006 ER PT J AU WIESINGER, HP SAUERZOPF, FM WEBER, HW GERSTENBERG, H CRABTREE, GW AF WIESINGER, HP SAUERZOPF, FM WEBER, HW GERSTENBERG, H CRABTREE, GW TI FLUX PINNING BY COLLISION CASCADES AND LARGE DEFECT CLUSTERS IN SINGLE-CRYSTAL YBA2CU3O7-DELTA SO EUROPHYSICS LETTERS LA English DT Article ID FAST-NEUTRON IRRADIATION; BEAN MODEL; DIFFUSION; CURRENTS AB Fast-neutron irradiation at low temperature was employed to introduce stable collision cascades, produced by high-energy recoil atoms, into an YBa2Cu3O7-delta single crystal. The critical current densities were inferred from magnetization measurements before and after warming-up to room temperature. The results show large J(c) enhancements in the <> state and only small reductions of these J(c) values upon annealing. At the same time, some recovery of the radiation-induced T(c) depression is observed, which is attributed to oxygen reordering. Both of these observations provide evidence for the overwhelming contribution of collision cascades and large-defect clusters to the improved flux pinning capability of neutron-irradiated YBCO. C1 TECH UNIV MUNICH,DEPT PHYS E21,W-8046 GARCHING,GERMANY. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WIESINGER, HP (reprint author), UNIV VIENNA,INST ATOM,A-1020 VIENNA,AUSTRIA. NR 25 TC 9 Z9 9 U1 1 U2 1 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD NOV 15 PY 1992 VL 20 IS 6 BP 541 EP 546 DI 10.1209/0295-5075/20/6/012 PG 6 WC Physics, Multidisciplinary SC Physics GA KA697 UT WOS:A1992KA69700012 ER PT J AU ONISHI, Y TRENT, DS AF ONISHI, Y TRENT, DS TI TURBULENCE MODELING FOR DEEP OCEAN RADIONUCLIDE DISPOSAL SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON COMPUTING IN CIVIL AND BUILDING ENGINEERING CY JUL 31-AUG 01, 1991 CL TOKYO, JAPAN DE TURBULENCE MODEL; DEEP OCEAN; RADIONUCLIDE; 3-DIMENSIONAL MODELING; EDDY VISCOSITY AB In this study the adequacy of the k-epsilon, turbulence model and the feasibility of the three-dimensional hydrodynamic-transport models TEMPEST and FLESCOT for deep ocean radionuclide disposal assessment were evaluated qualitatively. TEMPEST and FLESCOT were. applied to a hypothetical, two-dimensional, deep ocean case with and without stratifications. TEMPEST with the k-epsilon model was applied to obtain quasi-steady state eddy viscosity distributions. With calculated eddy viscosity distributions as part of the input, FLESCOT then calculated distributions of velocity, water temperature, sediment and the disssolved and sediment-sorbed radionuclide, assuming that the radionuclide was disposed on the ocean bottom. Results revealed that the computed eddy viscosity increased almost linearly with vertical distance near the ocean bottom, then rapidly decreased towards a molecular viscosity value when the vertical gradient of the velocity distribution became very small. The results also demonstrate the importance of the density gradient to suppress the turbulent kinetic energy production, resulting in reduced eddy viscosity, producing the maximum computed eddy viscosity of 0.2 Pa s, which compares well with the reported value of 0.07 Pa s in the deep ocean. Thus the k-epsilon turbulence model appears to be qualitatively applicable to the deep ocean environment. RP ONISHI, Y (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 10 TC 3 Z9 3 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD NOV 15 PY 1992 VL 15 IS 9 BP 1059 EP 1071 DI 10.1002/fld.1650150910 PG 13 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA JX943 UT WOS:A1992JX94300009 ER PT J AU HEALD, SM NIELSEN, B AF HEALD, SM NIELSEN, B TI DENSITY AND DEFECTS IN THIN METAL-FILMS USING X-RAY REFLECTIVITY AND VARIABLE-ENERGY POSITRONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ANOMALOUS-SCATTERING FACTORS; INTERFACES AB X-ray reflectivity has been used to determine the absolute metal density for both metals in bilayers of Al on top of Co, Cr, Cu, Mn, Ni, and Pd. A large variation in density is found with an observed range of 0.87-1.0 of bulk values. The results can be correlated with changes in the defect character as determined by variable-energy positron measurements. The size of the open volume defects systematically increases as the metal density decreases. A distinct densification of the Co layer was observed after annealing, and was accompanied by a corresponding reduction in the average size of the defects. There seems to be at least a partial correlation of the density with the melting point of the metals, although other factors such as the crystal structure are likely important. These results also demonstrate the application of x-ray reflectivity and variable-energy positrons to studies of thin metal films, and a discussion of their potential utility is included. RP HEALD, SM (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Nielsen, Bent/B-7353-2009 OI Nielsen, Bent/0000-0001-7016-0040 NR 13 TC 13 Z9 13 U1 0 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 15 PY 1992 VL 72 IS 10 BP 4669 EP 4673 DI 10.1063/1.352071 PG 5 WC Physics, Applied SC Physics GA JX766 UT WOS:A1992JX76600023 ER PT J AU JOSHI, RP KENNEDY, MK SCHOENBACH, KH HOFER, WW AF JOSHI, RP KENNEDY, MK SCHOENBACH, KH HOFER, WW TI STUDIES OF HIGH-FIELD CONDUCTION IN DIAMOND FOR ELECTRON-BEAM CONTROLLED SWITCHING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; GAAS; FILMS AB Experimental studies on a vertical metal-diamond-silicon switch structure have been conducted for potential pulsed power applications. Both the dc current-voltage characteristics and the transient switching response have been measured for a range of voltages. With a 1 mum diamond film, the switch has been seen to withstand electric fields up to 1.8 MV/cm. Our results show a polarity dependence which can be associated with current injection at the asymmetric contacts. Polarity effects were also observed in the presence of e-beam excitation, and arise due to nonuniform carrier generation near the diamond-silicon interface. Our switching transients were seen to follow the shape of the e-beam for a negative bias at the silicon substrate. For positive voltage values exceeding about 80 V however, the switch is seen to go into a persistent-photocurrent mode. This effect is a result of free carrier trapping within diamond and is enhanced by the double injection process. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP JOSHI, RP (reprint author), OLD DOMINION UNIV,DEPT ELECT & COMP ENGN,NORFOLK,VA 23529, USA. NR 31 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1992 VL 72 IS 10 BP 4781 EP 4787 DI 10.1063/1.352090 PG 7 WC Physics, Applied SC Physics GA JX766 UT WOS:A1992JX76600043 ER PT J AU WILLIAMS, S ZHENG, JQ SHIH, MC WANG, XK LEE, SJ RIPPERT, ED MAGLIC, S KAJIYAMA, H SEGEL, D DUTTA, P CHANG, RPH KETTERSON, JB ROBERTS, T LIN, Y KAMPWIRTH, RT GRAY, K AF WILLIAMS, S ZHENG, JQ SHIH, MC WANG, XK LEE, SJ RIPPERT, ED MAGLIC, S KAJIYAMA, H SEGEL, D DUTTA, P CHANG, RPH KETTERSON, JB ROBERTS, T LIN, Y KAMPWIRTH, RT GRAY, K TI INSITU X-RAY-DIFFRACTION STUDIES OF YBA2CU3OX SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID YBCO THIN-FILMS; GROWTH; MICROSTRUCTURE AB Using a specially designed off-axis faced magnetron sputtering chamber we have performed in situ x-ray diffraction studies of the growth of YBa2Cu3Ox films using a synchrotron light source. The orientation and rocking curve width were studied as a function of substrate temperature, O2/Ar partial pressures, and deposition rate. Growth rate was studied on SrTiO3, LaAlO3, and MgO. C1 NORTHWESTERN UNIV,MAT RES CTR,EVANSTON,IL 60208. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WILLIAMS, S (reprint author), NORTHWESTERN UNIV,NATL SCI FDN,SCI & TECHNOL CTR SUPERCONDUCTIV,EVANSTON,IL 60208, USA. RI Ketterson, John/B-7234-2009; Chang, R.P.H/B-7505-2009 NR 11 TC 11 Z9 11 U1 0 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 15 PY 1992 VL 72 IS 10 BP 4798 EP 4804 DI 10.1063/1.352093 PG 7 WC Physics, Applied SC Physics GA JX766 UT WOS:A1992JX76600046 ER PT J AU SANFORD, TWL HALBLEIB, JA POUKEY, JW WELCH, DR MCATEE, WH MOCK, RC AF SANFORD, TWL HALBLEIB, JA POUKEY, JW WELCH, DR MCATEE, WH MOCK, RC TI VERY INTENSE SOURCE OF FLASH X-RAYS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FIELD AB This article describes the design of a very intense source of flash x rays using the HERMES III electron accelerator that delivers a measured peak dose and peak dose rate of (370 +/- 58) krad(CaF2) and (3.5 +/- 0.7) X 10(13) rad(CaF2)/s, respectively, over a useful area of 80 cm2, without target destruction. Measured electron and photon source distributions agree with those generated from a numerical model. The quality of the agreement gives credibility to both and validates the main assumptions of the model. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1992 VL 72 IS 10 BP 4934 EP 4939 DI 10.1063/1.352061 PG 6 WC Physics, Applied SC Physics GA JX766 UT WOS:A1992JX76600067 ER PT J AU WANG, ZY TANG, J NORRIS, JR AF WANG, ZY TANG, J NORRIS, JR TI THE GENERAL TREATMENT OF DYNAMIC SOLVENT EFFECTS IN ELECTRON-TRANSFER AT HIGH-TEMPERATURE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID POLAR-SOLVENTS; BIOLOGICAL MOLECULES; SOLVATION DYNAMICS; FRICTION; RELAXATION AB A general treatment of dynamic solvent effects for outer-sphere electron transfer reactions based on the interactions between the electron transfer system and the solvent bath is presented. The electron transfer rate constant as a function of the solvent longitudinal relaxation time is categorized into the three solvent relaxation regions of adiabatic, normal, and fast. New nonadiabatic effects in the very fast solvent relaxation region are identified. A unified picture for adiabatic and nonadiabatic reactions, as well as a criterion for adiabaticity is given. C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RP WANG, ZY (reprint author), UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637, USA. RI Tang, Jau/D-8382-2012 OI Tang, Jau/0000-0003-2078-1513 NR 43 TC 18 Z9 18 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1992 VL 97 IS 10 BP 7251 EP 7256 DI 10.1063/1.463978 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JY567 UT WOS:A1992JY56700022 ER PT J AU MCRAE, RP SCHENTER, GK GARRETT, BC HAYNES, GR VOTH, GA SCHATZ, GC AF MCRAE, RP SCHENTER, GK GARRETT, BC HAYNES, GR VOTH, GA SCHATZ, GC TI CRITICAL COMPARISON OF APPROXIMATE AND ACCURATE QUANTUM-MECHANICAL CALCULATIONS OF RATE CONSTANTS FOR A MODEL ACTIVATED REACTION IN SOLUTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Review ID TRANSITION-STATE-THEORY; ELECTRON-TRANSFER REACTIONS; FLUX AUTOCORRELATION FUNCTION; THERMAL RATE COEFFICIENTS; PATH INTEGRAL APPROACH; MOLECULAR-DYNAMICS; SEMICLASSICAL MODEL; CHEMICAL-REACTIONS; TRANSMISSION COEFFICIENT; BENCHMARK CALCULATIONS AB Accurate quantum-mechanical calculations of rate constants for a model of reaction in solution are used as benchmarks for two approximate methods: variational transition-state theory with semiclassical corrections for reaction coordinate motion, and the path-integral centroid density method. The reaction model corresponds to a single solute coordinate coupled to a harmonic bath mode. When the harmonic frequency of the bath oscillator is sufficiently high, the results of the approximate methods agree well with the accurate quantum-mechanical ones. For the lowest-frequency bath oscillator considered, the agreement is not as good, but still satisfactory; the worst discrepancies are a factor of 2.0 for the centroid density methods and a factor of 3.3 for variational transition-state theory with semiclassical tunneling corrections. Applications of the approximate methods to models including up to ten bath oscillators indicate that a single bath oscillator provides a reasonable model of a converged harmonic bath. C1 UNIV PENN, DEPT CHEM, PHILADELPHIA, PA 19104 USA. NORTHWESTERN UNIV, DEPT CHEM, EVANSTON, IL 60208 USA. RP MCRAE, RP (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. RI Garrett, Bruce/F-8516-2011; Schenter, Gregory/I-7655-2014 OI Schenter, Gregory/0000-0001-5444-5484 NR 96 TC 51 Z9 51 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1992 VL 97 IS 10 BP 7392 EP 7404 DI 10.1063/1.463511 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JY567 UT WOS:A1992JY56700036 ER PT J AU BARNES, MD WHITTEN, WB ARNOLD, S RAMSEY, JM AF BARNES, MD WHITTEN, WB ARNOLD, S RAMSEY, JM TI HOMOGENEOUS LINEWIDTHS OF RHODAMINE-6G AT ROOM-TEMPERATURE FROM CAVITY-ENHANCED SPONTANEOUS EMISSION RATES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID INHIBITED SPONTANEOUS EMISSION; ENERGY-TRANSFER; DIELECTRIC PARTICLES; AEROSOL-PARTICLE; RESONANCES; MICRODROPLETS; MICROPARTICLE; SCATTERING RP OAK RIDGE NATL LAB, DIV ANALYT CHEM, OAK RIDGE, TN 37831 USA. NR 30 TC 55 Z9 56 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 15 PY 1992 VL 97 IS 10 BP 7842 EP 7845 DI 10.1063/1.463457 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JY567 UT WOS:A1992JY56700088 ER PT J AU JONG, BW SLAVENS, GJ TRAUT, DE AF JONG, BW SLAVENS, GJ TRAUT, DE TI SYNTHESIS OF SILICON AND SILICON-NITRIDE POWDERS BY VAPOR-PHASE REACTIONS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID CERAMICS AB The Bureau of Mines is investigating vapour-phase reactions for syntheses of high-purity, nanometre-sized silicon and Si3N4 powders suitable for industrial applications. In this study, submicrometre-sized silicon powder was formed by a vapour-phase reaction of SiCl4, NH3, and magnesium vapor at temperatures ranging from 950-1050-degrees-C. The silicon was subsequently nitrided to form Si3N4 at 1150-degrees-C. RP JONG, BW (reprint author), US DEPT INTERIOR,BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 18 TC 8 Z9 9 U1 0 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD NOV 15 PY 1992 VL 27 IS 22 BP 6086 EP 6090 DI 10.1007/BF01133754 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA JZ837 UT WOS:A1992JZ83700016 ER PT J AU SIMMONS, JW ATTERIDGE, DG RAWERS, J AF SIMMONS, JW ATTERIDGE, DG RAWERS, J TI MICROSTRUCTURAL CHARACTERIZATION OF AS-CAST HIGH-NITROGEN FE-15CR-15NI ALLOYS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID STAINLESS-STEEL; PRECIPITATION AB A base composition of Fe-15Cr-15Ni was melted in a hot-isostatic-pressure furnace under nitrogen pressures from 0.1-150 MPa (1-1500 atm) to produce materials with nitrogen concentrations from 0.04-3.6 wt%. Microstructural characterization of the as-cast materials was completed using optical microscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy techniques, The phases present in the materials were austenite, nitrides (Cr2N and CrN), and martensite. All of the materials solidified with primary austenite dendrites. Dendritic solidification of CrN occurred in interdendritic regions of the austenite in alloys containing between 0.6 and 1.9 wt% N. Cellular precipitation of Cr2N occurred in alloys with intermediate nitrogen concentrations (0.6 and 1.0 wt%). The orientation relationship between the Cr2N and austenite, expressed as {111}gamma//{0001}Cr2N and [110]gamma//[- 1100]Cr2N, was confirmed. Precipitates of CrN with both lamellar and disc morphologies formed in the austenite. Both had a cube-cube orientation relationship with the austenite. Only about 10% of the 3.6 wt% N material solidified as primary austenite. The remainder of the material solidified as a eutectic according to the reaction L --> gamma + CrN. All of the austenite in the eutectic region subsequently transformed to martensite. Increasing volume fractions of martensite formed with increasing bulk nitrogen concentrations in the materials due to alloy depletion of austenite caused by nitride formation. C1 US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321. RP SIMMONS, JW (reprint author), OREGON GRAD INST SCI & TECHNOL,19600 NW VONNEUMANN DR,BEAVERTON,OR 97006, USA. NR 29 TC 15 Z9 15 U1 2 U2 5 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD NOV 15 PY 1992 VL 27 IS 22 BP 6105 EP 6115 DI 10.1007/BF01133757 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA JZ837 UT WOS:A1992JZ83700019 ER PT J AU SCHLESINGER, TE BAO, XJ JAMES, RB CHENG, AY ORTALE, C VANDENBERG, L AF SCHLESINGER, TE BAO, XJ JAMES, RB CHENG, AY ORTALE, C VANDENBERG, L TI CARRIER TRAPS AND TRANSPORT IN MERCURIC IODIDE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL WORKSHOP ON ROOM TEMPERATURE SEMICONDUCTOR X-RAY AND GAMMA-RAY DETECTORS AND ASSOCIATED ELECTRONICS ( 7TH RTSDE ) CY SEP 23-28, 1991 CL RAVELLO, ITALY SP INT UNION MAT RES SOC ID STIMULATED CURRENT MEASUREMENTS; CRYSTALS; HGI2; DETECTORS; HGL2 AB Thermally stimulated current spectroscopy (TSC) was performed on a variety of mercuric iodide samples and detectors to determine the nature and origin of deep traps in this material. It is shown that the trap type and concentration is a function of the metal overlayer employed as a contact material. The energy barrier height as well as the type (electron or hole) of barrier at the metal/semiconductor interface has also been determined by internal photoemission measurements. When polarization effects are not present, as is the case in most Pd contacted samples, the barrier height can be accurately determined by this technique. A value of 1.05 eV was measured for a hole barrier at the Pd/HgI2 interface. C1 SANDIA NATL LABS,DIV ADV MAT RES,LIVERMORE,CA 94550. EG&G ENERGY MEASUREMENTS INC,GOLETA,CA 93116. RP SCHLESINGER, TE (reprint author), CARNEGIE MELLON UNIV,DEPT ELECT & COMP ENGN,PITTSBURGH,PA 15243, USA. NR 28 TC 14 Z9 14 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 NOV 15 PY 1992 VL 322 IS 3 BP 414 EP 420 DI 10.1016/0168-9002(92)91206-O PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JZ930 UT WOS:A1992JZ93000017 ER PT J AU JAMES, RB BAO, XJ SCHLESINGER, TE CHENG, AY ORTALE, C VANDENBERG, L AF JAMES, RB BAO, XJ SCHLESINGER, TE CHENG, AY ORTALE, C VANDENBERG, L TI PHOTOLUMINESCENCE INVESTIGATIONS OF DEFECTS INTRODUCED DURING PROCESSING OF MERCURIC IODIDE NUCLEAR-DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL WORKSHOP ON ROOM TEMPERATURE SEMICONDUCTOR X-RAY AND GAMMA-RAY DETECTORS AND ASSOCIATED ELECTRONICS ( 7TH RTSDE ) CY SEP 23-28, 1991 CL RAVELLO, ITALY SP INT UNION MAT RES SOC ID LUMINESCENCE; HGI2; SPECTRUM AB Low-temperature photoluminescence (PL) spectroscopy was performed on a variety of HgI2 samples to determine the effects of chemical etching with KI and HNO3 solutions and the modifications in the PL spectra due to the presence of carbon, chromium and parylene films. These investigations reveal that the processing steps used to manufacture HgI2 nuclear detectors can lead to the incorporation of new defects into the near-surface region of the crystals. Moreover, correlations between the photoluminescence spectra and detector performance show that some of these defects are undesirable for producing high-quality devices. C1 CARNEGIE MELLON UNIV,DEPT ELECT & COMP ENGN,PITTSBURGH,PA 15213. EG&G ENERGY MEASUREMENTS INC,GOLETA,CA 93116. RP JAMES, RB (reprint author), SANDIA NATL LABS,DIV ADV MAT RES,LIVERMORE,CA 94550, USA. NR 30 TC 12 Z9 12 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 NOV 15 PY 1992 VL 322 IS 3 BP 435 EP 441 DI 10.1016/0168-9002(92)91210-Z PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JZ930 UT WOS:A1992JZ93000021 ER PT J AU MCGREGOR, DS KNOLL, GF EISEN, Y BRAKE, R AF MCGREGOR, DS KNOLL, GF EISEN, Y BRAKE, R TI BULK GAAS ROOM-TEMPERATURE RADIATION DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL WORKSHOP ON ROOM TEMPERATURE SEMICONDUCTOR X-RAY AND GAMMA-RAY DETECTORS AND ASSOCIATED ELECTRONICS ( 7TH RTSDE ) CY SEP 23-28, 1991 CL RAVELLO, ITALY SP INT UNION MAT RES SOC AB Bulk GaAs, a wide band gap semiconductor, shows potential as a room temperature radiation detector. Schottky diode detectors were fabricated from LEC bulk GaAs crystals. The basic construction of these diodes employed the use of a Ti/Au Schottky contact and a Au/Ge/Ni alloyed ohmic contact. Pulse height characteristics of these diodes indicate active regions of more than 100 mum. Pulse height spectra were recorded from alpha particle irradiation of the Schottky contact surface resulting in a best energy resolution of 2.5% at 5.5 MeV. Low energy gamma rays measured under room temperature operating conditions resulted in photopeaks with 37% FWHM at 60 keV. C1 SOREQ NUCL RES CTR,ISRAEL ATOM ENERGY COMM,IL-70600 YAVNE,ISRAEL. LOS ALAMOS NATL LAB,RADIAT PROTECT GRP,LOS ALAMOS,NM 87545. RP MCGREGOR, DS (reprint author), UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109, USA. NR 12 TC 27 Z9 27 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 NOV 15 PY 1992 VL 322 IS 3 BP 487 EP 492 DI 10.1016/0168-9002(92)91219-Y PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JZ930 UT WOS:A1992JZ93000030 ER PT J AU CONTI, M DELGUERRA, A MAZZEI, D RUSSO, P BENCIVELLI, W BERTOLUCCI, E MESSINEO, A ROSSO, V STEFANINI, A BOTTIGLI, U RANDACCIO, P NELSON, WR AF CONTI, M DELGUERRA, A MAZZEI, D RUSSO, P BENCIVELLI, W BERTOLUCCI, E MESSINEO, A ROSSO, V STEFANINI, A BOTTIGLI, U RANDACCIO, P NELSON, WR TI USE OF THE EGS4 MONTE-CARLO CODE TO EVALUATE THE RESPONSE OF HGI2 AND CDTE DETECTORS FOR PHOTONS IN THE DIAGNOSTIC ENERGY-RANGE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL WORKSHOP ON ROOM TEMPERATURE SEMICONDUCTOR X-RAY AND GAMMA-RAY DETECTORS AND ASSOCIATED ELECTRONICS ( 7TH RTSDE ) CY SEP 23-28, 1991 CL RAVELLO, ITALY SP INT UNION MAT RES SOC ID RAY DIGITAL RADIOGRAPHY AB We present the results of the detailed simulation of the response of a HgI2 crystal in terms of efficiency, energy and space resolutions versus photon energy in the diagnostic energy range 20-100 keV. Some configurations of CdTe crystals for positron emission tomography are also evaluated. C1 INFN,SEZ NAPOLI,NAPLES,ITALY. UNIV PISA,DIPARTIMENTO FIS,I-56010 SAN PIERO A GRADO,ITALY. INFN,SEZ PISA,PISA,ITALY. UNIV CAGLIARI,IST FIS MED,I-09100 CAGLIARI,ITALY. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. INFN,SEZ CAGLIARI,CAGLIARI,ITALY. RP CONTI, M (reprint author), NAPLES UNIV,DIPARTIMENTO SCI FIS,PAD 20 MOSTRA OLTREMARE,I-80125 NAPLES,ITALY. RI bencivelli, walter/H-1898-2012; OI Bottigli, Ubaldo/0000-0002-0666-3433; Russo, Paolo/0000-0001-9409-0008 NR 14 TC 7 Z9 7 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 NOV 15 PY 1992 VL 322 IS 3 BP 591 EP 595 DI 10.1016/0168-9002(92)91237-4 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JZ930 UT WOS:A1992JZ93000048 ER PT J AU DABROWSKI, B ZHANG, K PLUTH, JJ WAGNER, JL HINKS, DG AF DABROWSKI, B ZHANG, K PLUTH, JJ WAGNER, JL HINKS, DG TI SINGLE-CRYSTAL GROWTH AND CHARACTERIZATION OF YBA2CU4O8 WITH T(C)SIMILAR-TO-80-K SO PHYSICA C LA English DT Article ID SUPERCONDUCTOR YBA2CU4O8; PRESSURE; DIFFRACTION; BA2YCU3O7; 80-K AB Single-crystals of YBa2Cu4O8 with T(c) approximately 80 K have been grown from a BaO-CuO flux at 1100-degrees-C under 600 bar of O2. Unlike earlier crystals of this material that were grown in Al2O3 Crucibles, crystals grown in ZrO2 crucibles show sharp superconducting single-transitions (DELTAT(c) approximately 0.5 K) with T(c)s as high as the best polycrystalline material. The high crystal quality was confirmed by crystal X-ray diffraction. The incorporation of a small amount of aluminium in the lattice (confirmed by electron microprobe measurements) is the probable cause for the degradation of superconducting properties of crystals grown in Al2O3 crucibles. C1 UNIV CHICAGO,JAMES FRANCK INST,MAT RES LAB,CHICAGO,IL 60637. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP DABROWSKI, B (reprint author), NO ILLINOIS UNIV,DEPT PHYS,DE KALB,IL 60115, USA. NR 17 TC 36 Z9 37 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 NOV 15 PY 1992 VL 202 IS 3-4 BP 271 EP 276 DI 10.1016/0921-4534(92)90171-8 PG 6 WC Physics, Applied SC Physics GA JZ668 UT WOS:A1992JZ66800010 ER PT J AU DRESSLER, U FARMER, JD AF DRESSLER, U FARMER, JD TI GENERALIZED LYAPUNOV EXPONENTS CORRESPONDING TO HIGHER DERIVATIVES SO PHYSICA D LA English DT Article AB We generalize the notion of Lyapunov exponents to higher order derivatives. For fixed points and periodic orbits we derive a relationship for the higher order Lyapunov spectrum in terms of the usual first order Lyapunov spectrum. Based on numerical experiments as well as general arguments, we conjecture that this relationship also holds for chaotic orbits. This work is relevant to a priori error estimates for time series forecasting. C1 DAIMLER BENZ AG,W-6000 FRANKFURT 71,GERMANY. PREDICT CO,SANTA FE,NM 87501. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP DRESSLER, U (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 7 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD NOV 15 PY 1992 VL 59 IS 4 BP 365 EP 377 DI 10.1016/0167-2789(92)90076-Y PG 13 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA KB803 UT WOS:A1992KB80300006 ER PT J AU ERPENBECK, JJ AF ERPENBECK, JJ TI MOLECULAR-DYNAMICS OF DETONATION .1. EQUATION OF STATE AND HUGONIOT CURVE FOR A SIMPLE REACTIVE FLUID SO PHYSICAL REVIEW A LA English DT Article ID SHOCK-INDUCED DETONATIONS; MONTE-CARLO SIMULATION; ENERGETIC SOLIDS; PROPAGATION; EQUILIBRIA; MIXTURES; ENSEMBLE; MODEL AB A simple microscopic model of chemical reactions is explored for diatomic exchange reactions 2AB half arrow right over half arrow left A2 + B2. A pair of atoms bind chemically when they lie within a "square" attractive well. The presence of a bond, however, leaves the bound atoms in a state in which they have only hard-sphere repulsion for other atoms. A calculation combining the canonical-ensemble Monte Carlo technique with molecular dynamics is used to determine the equilibrium composition and thermodynamic properties of equimolar binary mixtures of A and B atoms, subject to this square-well, hard-sphere interaction potential for temperatures and densities accessible to detonation waves in a fluid consisting of metastable AB molecules at an initial temperature epsilon(AB)/20k(B) (in which epsilon(ab) is the well depth of the ab interaction and k(B) is the Boltzmann constant), with epsilon(AA) = 3epsilon(AB) and epsilon(BB) = epsilon(AB). The calculations for systems of both 216 and 1728 atoms include the pressure, the internal energy, and the mean free times for various types of collisions. The Hugoniot curve for states behind detonation waves is determined for six values of the density for the smaller systems and one value for the larger; finite-system effects are found to be small. The Hugoniot curve is shown to have a concave shape in the pressure-volume plane, typical of exothermic materials, and the Chapman-Jouguet state is determined. RP ERPENBECK, JJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 23 TC 33 Z9 33 U1 0 U2 5 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 6406 EP 6416 DI 10.1103/PhysRevA.46.6406 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JZ678 UT WOS:A1992JZ67800042 ER PT J AU MIKAELIAN, KO AF MIKAELIAN, KO TI SIMPLE-MODEL FOR ABLATIVE STABILIZATION SO PHYSICAL REVIEW A LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; STRATIFIED FLUIDS; GROWTH-RATES; LASER-FUSION; DRIVEN; STABILITY; SIMULATION AB We present a simple analytic model for ablative stablization of the Rayleigh-Taylor instability. In this model the effect of ablation is to move the peak of the perturbations to the location of peak pressure. This mechanism enhances the density-gradient stabilization, which is effective at short wavelengths, and it also enhances the stabilization of long-wavelength perturbations due to finite shell thickness. We consider the following density profile: exponential blowoff plasma with a density gradient beta, followed by a constant-density shell of thickness deltat. For perturbations of arbitrary wave number k, we present an explicit expression for the growth rate gamma as a function of k,beta, and deltat. We find that "thick" shells defined by betadeltat greater-than-or-equal-to 1 have gamma2 greater-than-or-equal-to 0 for any k, while "thin" shells defined by betadeltat < 1 can have gamma2 < 0 for small k, reflecting stability by proximity to the back side of the shell. We also present LASNEX simulations that are in good agreement with our analytic formulas. RP MIKAELIAN, KO (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 35 TC 17 Z9 18 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV 15 PY 1992 VL 46 IS 10 BP 6621 EP 6627 DI 10.1103/PhysRevA.46.6621 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JZ678 UT WOS:A1992JZ67800061 ER EF