FN Thomson Reuters Web of Science™ VR 1.0 PT J AU PALMER, DA HYDE, KE AF PALMER, DA HYDE, KE TI THE FORMATION OF AQUEOUS METAL CHLORIDE COMPLEXES TO HIGH-TEMPERATURES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. SUNY COLL OSWEGO,OSWEGO,NY 13126. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 8 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000377 ER PT J AU BURGIO, GF CHOMAZ, P RANDRUP, J AF BURGIO, GF CHOMAZ, P RANDRUP, J TI FLUCTUATIONS OF THE SINGLE-PARTICLE DENSITY IN NUCLEAR-DYNAMICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 9 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100009 ER PT J AU HINKS, DG JORGENSEN, JD DABROWSKI, B PEI, SY RADAELLI, P RICHARDS, D AF HINKS, DG JORGENSEN, JD DABROWSKI, B PEI, SY RADAELLI, P RICHARDS, D TI SYNTHESIS AND TC IN SIMPLE SUPERCONDUCTING OXIDE SYSTEMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,SCI & TECHNOL CTR SUPERCONDUCT,ARGONNE,IL 60439. RI Radaelli, Paolo/C-2952-2011 OI Radaelli, Paolo/0000-0002-6717-035X NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 9 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100549 ER PT J AU WOODRUFF, RD AF WOODRUFF, RD TI FREEDOM OF SPEECH - THE DELICATE BALANCE - DEFENSE RESEARCH IN A DEMOCRATIC-SOCIETY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 9 EP PROF PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101461 ER PT J AU CRAWFORD, MK FARNETH, WE MCCARRON, EM HARLOW, RL KUNCHUR, M POON, SJ AF CRAWFORD, MK FARNETH, WE MCCARRON, EM HARLOW, RL KUNCHUR, M POON, SJ TI OXYGEN ISOTOPE EFFECT AND STRUCTURAL PHASE-TRANSITIONS IN LA2CUO4 BASED SUPERCONDUCTORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 DUPONT CO,EXPTL STN,WILMINGTON,DE 19880. BROOKHAVEN NATL LAB,UPTON,NY 11794. CEA SACLAY,LAB LEON BILLOUIN,CNRS,F-91191 GIF SUR YVETTE,FRANCE. UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 10 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100550 ER PT J AU KNAPP, DA WILKERSON, JF BOWLES, TJ FRIAR, JL ROBERTSON, RGH STEPHENSON, GJ WARK, DL AF KNAPP, DA WILKERSON, JF BOWLES, TJ FRIAR, JL ROBERTSON, RGH STEPHENSON, GJ WARK, DL TI LIMIT ON THE ELECTRON ANTINEUTRINO MASS FROM MEASUREMENT OF THE BETA-DECAY OF MOLECULAR TRITIUM SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 10 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100010 ER PT J AU FUHRMANN, M PIETRZAK, R HEISER, JH COLOMBO, P AF FUHRMANN, M PIETRZAK, R HEISER, JH COLOMBO, P TI DETERMINING IF DIFFUSION IS THE LEACHING MECHANISM OF PORTLAND-CEMENT BASED WASTE FORMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 11 EP ENVR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001685 ER PT J AU STOEFFL, W DECMAN, DJ AF STOEFFL, W DECMAN, DJ TI THE TRITIUM BETA-DECAY SPECTRUM FROM END-TO-END AND THE NEUTRINO MASS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 11 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100011 ER PT J AU AVIGNONE, FT COLLAR, JI GUERARD, CK BRODZINSKI, RL MILEY, HS REEVES, JH AF AVIGNONE, FT COLLAR, JI GUERARD, CK BRODZINSKI, RL MILEY, HS REEVES, JH TI A REPORT OF SOME RECENT DOUBLE-BETA DECAY EXPERIMENTS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV S CAROLINA, DEPT PHYS & ASTRON, COLUMBIA, SC 29208 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 13 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100013 ER PT J AU LENGSFIELD, BH AF LENGSFIELD, BH TI CONFIGURATION-INTERACTION STUDIES OF SYMMETRY-BREAKING IN SMALL MOLECULES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,THEORET ATOM & MOLEC PHYS GRP,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 14 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100554 ER PT J AU GHIORSO, A AF GHIORSO, A TI THE FUSION OF CO AND BI TO MAKE ELEMENT-110 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 15 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100015 ER PT J AU HOFFMAN, DC HOFFMAN, MM LEYBA, JD AF HOFFMAN, DC HOFFMAN, MM LEYBA, JD TI PRODUCTION OF ACTINIDE ISOTOPES VIA TRANSFER-REACTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 16 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100016 ER PT J AU TEVAULT, CV GREENBAUM, E AF TEVAULT, CV GREENBAUM, E TI PHOTOSYNTHETIC WATER SPLITTING BY PLATINIZED CHLOROPLASTS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 16 EP ASCS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101525 ER PT J AU TRUMBORE, SE ANDERSON, RF AF TRUMBORE, SE ANDERSON, RF TI CARBON AND C-14 BUDGET FOR UPPER SLOPE SEDIMENTS OF THE MIDDLE ATLANTIC BIGHT SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,CTR AMS,LIVERMORE,CA 94550. COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 16 EP GEOC PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001940 ER PT J AU ANTHONY, RG GONZALEZ, EF DOSCH, RG AF ANTHONY, RG GONZALEZ, EF DOSCH, RG TI SYNTHESIS AND CATALYTIC ACTIVITY WHEN USING A TYPE-2 TITANATE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 TEXAS A&M UNIV SYST,COLLEGE STN,TX 77843. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 17 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100408 ER PT J AU PEDEN, CHF AF PEDEN, CHF TI THE PREPARATION AND CHARACTERIZATION OF NOVEL CATALYST SUPPORT MATERIALS - THE HYDROUS METAL-OXIDE ION-EXCHANGERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 18 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100409 ER PT J AU SMALL, GJ AF SMALL, GJ TI EXCITED-STATE STRUCTURE AND TRANSPORT DYNAMICS OF PHOTOSYNTHETIC UNITS - SPECTRAL HOLE BURNING STUDIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. 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 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 18 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100558 ER PT J AU HAHN, RL AF HAHN, RL TI NEUTRINOS AND CHEMISTRY - A BRIEF TUTORIAL SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 19 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100019 ER PT J AU BARON, S AF BARON, S TI IS THERE A FUTURE FOR NUCLEAR-POWER SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 22 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001805 ER PT J AU SCHROEDER, NC WOLFSBERG, K ROKOP, DJ AF SCHROEDER, NC WOLFSBERG, K ROKOP, DJ TI THE MOLYBDENUM-TECHNETIUM SOLAR NEUTRINO EXPERIMENT SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 22 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100022 ER PT J AU POWELL, JR AF POWELL, JR TI NEW GENERATION OF INHERENTLY SAFE AND ADVANCED NUCLEAR-POWER REACTORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 23 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001806 ER PT J AU ALEKLETT, K LILJENZIN, JO LOVELAND, W SIHVER, L SEABORG, GT YANEZ, R AF ALEKLETT, K LILJENZIN, JO LOVELAND, W SIHVER, L SEABORG, GT YANEZ, R TI HEAVY RESIDUE PROPERTIES IN INTERMEDIATE ENERGY NUCLEAR COLLISIONS WITH GOLD SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV UPPSALA,S-75105 UPPSALA,SWEDEN. CHALMERS UNIV TECHNOL,S-41296 GOTHENBURG,SWEDEN. OREGON STATE UNIV,CORVALLIS,OR 97331. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 24 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100024 ER PT J AU STEINBERG, M AF STEINBERG, M TI NUCLEAR-FUEL CYCLE AND SPECIAL PROBLEMS IN NUCLEAR-ENERGY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 24 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001807 ER PT J AU WANG, HH CARLSON, KD GEISER, U KINI, AM WILLIAMS, JM SCHIRBER, JE AF WANG, HH CARLSON, KD GEISER, U KINI, AM WILLIAMS, JM SCHIRBER, JE TI OVERVIEW OF ORGANIC SUPERCONDUCTORS - SYNTHESES, STRUCTURES AND PHYSICAL-PROPERTIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 24 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100564 ER PT J AU SCHIRBER, JE AF SCHIRBER, JE TI THE IMPORTANCE OF PRESSURE IN THE CREATION AND STUDY OF SUPERCONDUCTIVITY IN ORGANIC MATERIALS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 25 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100565 ER PT J AU HURT, RH MITCHELL, RE AF HURT, RH MITCHELL, RE TI ON THE COMBUSTION KINETICS OF HETEROGENEOUS CHAR PARTICLE-POPULATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. NR 0 TC 0 Z9 0 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 26 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001809 ER PT J AU BARRETO, J CHARITY, R SOBOTKA, LG SARANTITES, DG STRACENER, DW CHBIHI, A NICOLIS, NG AUBLE, R BAKTASH, C BEENE, JR BERTRAND, F HALBERT, M HENSLEY, DC HOREN, D LUDERMANN, C THOENNESSEN, M VARNER, R AF BARRETO, J CHARITY, R SOBOTKA, LG SARANTITES, DG STRACENER, DW CHBIHI, A NICOLIS, NG AUBLE, R BAKTASH, C BEENE, JR BERTRAND, F HALBERT, M HENSLEY, DC HOREN, D LUDERMANN, C THOENNESSEN, M VARNER, R TI PROJECTILE BREAKUP IN 25-MEV/A REACTIONS, PROMPT OR SEQUENTIAL SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 WASHINGTON UNIV,DEPT CHEM,ST LOUIS,MO 63130. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 27 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100027 ER PT J AU KWEI, GH AF KWEI, GH TI CATION-DOPANT SITE SELECTIVITY, OXYGEN STOICHIOMETRY, AND CU VALENCE IN THE HIGH-TC SUPERCONDUCTORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 27 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100567 ER PT J AU MCCARLEY, RE AF MCCARLEY, RE TI NEW STRUCTURES WITH METAL-CLUSTERS AND EXTENDED METAL-METAL BONDING SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 29 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001072 ER PT J AU HARDCASTLE, FD PEDEN, CHF OMSTEAD, TR FARKAS, J HAMPDENSMITH, M KODAS, T AF HARDCASTLE, FD PEDEN, CHF OMSTEAD, TR FARKAS, J HAMPDENSMITH, M KODAS, T TI THE DEPOSITION CHARACTERISTICS OF COPPER(I) COMPOUNDS FOR CVD BY FT-IR AND RAMAN-SPECTROSCOPY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,DEPT CHEM ENGN,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 31 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001430 ER PT J AU KOETZLE, TF ABOLA, EE BERNSTEIN, FC CALLAWAY, JA CHRISTIAN, JJ DEROSKI, BR ESPOSITO, PA FORMAN, A MCCARTHY, JE SKORA, JG AF KOETZLE, TF ABOLA, EE BERNSTEIN, FC CALLAWAY, JA CHRISTIAN, JJ DEROSKI, BR ESPOSITO, PA FORMAN, A MCCARTHY, JE SKORA, JG TI THE PROTEIN DATA-BANK - PRESENT STATUS AND FUTURE-PLANS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 31 EP CINF PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001339 ER PT J AU BELL, AT SHUSTOROVICH, E AF BELL, AT SHUSTOROVICH, E TI APPLICATION OF THE BOC-MP METHOD FOR EVALUATION OF REACTION PATHWAY CONTROL ON METALS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,DEPT CHEM ENGN,BERKELEY,CA 94720. EASTMAN KODAK CO,ROCHESTER,NY 14650. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 32 EP CATL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001015 ER PT J AU WILHELMY, JB AF WILHELMY, JB TI SUDBURY NEUTRINO OBSERVATORY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 32 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100032 ER PT J AU NAGY, JO BEDNARSKI, MD AF NAGY, JO BEDNARSKI, MD TI THE CHEMICAL-ENZYMATIC SYNTHESIS OF A CARBON GLYCOSIDE OF N-ACETYL NEURAMINIC ACID SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 34 EP CARB PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000951 ER PT J AU NIMLOS, MR MILNE, TA AF NIMLOS, MR MILNE, TA TI GAS-PHASE SOLAR DETOXIFICATION OF HAZARDOUS WASTES - LABORATORY STUDIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 35 EP ENVR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001709 ER PT J AU FUJITA, E MILDER, S BRUNSCHWIG, BS AF FUJITA, E MILDER, S BRUNSCHWIG, BS TI PHOTOCHEMICAL PROPERTIES OF COVALENTLY ATTACHED SENSITIZER MEDIATOR OR DONOR-ACCEPTOR COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Brunschwig, Bruce/G-4249-2011; Fujita, Etsuko/D-8814-2013 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 38 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002091 ER PT J AU WERTZ, DL WHITE, C AF WERTZ, DL WHITE, C TI SHORT-RANGE STRUCTURING IN A META-ANTHRACITE COAL SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236. UNIV SO MISSISSIPPI,DEPT CHEM & BIOCHEM,HATTIESBURG,MS 39406. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 40 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001823 ER PT J AU PRUSKI, M KELZENBERG, JC SPROCK, M HWANG, SJ GERSTEIN, BC KING, TS AF PRUSKI, M KELZENBERG, JC SPROCK, M HWANG, SJ GERSTEIN, BC KING, TS TI SELECTIVITY OF SUPPORTED BIMETALLIC CATALYSTS TOWARD CATALYTIC REFORMING - THE REACTION OF ETHYLENE WITH M-RU-SIO2 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 42 EP CATL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001025 ER PT J AU BARTRAM, ME AF BARTRAM, ME TI CHEMISORPTION OF ALUMINUM ALKYLS AND AMMONIA ON SILICA - MECHANISMS FOR THE FORMATION OF AL-N BONDS ON THE SURFACE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 45 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001444 ER PT J AU PELLIN, MJ LYKKE, KR WURZ, P PARKER, DH HEMMINGER, JC GRUEN, DM AF PELLIN, MJ LYKKE, KR WURZ, P PARKER, DH HEMMINGER, JC GRUEN, DM TI MOLECULAR-IDENTIFICATION IN SURFACE-ANALYSIS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DEPT CHEM,ARGONNE,IL 60439. UNIV CALIF IRVINE,IRVINE,CA 92717. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 45 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100044 ER PT J AU FARCASIU, M SMITH, CM LADNER, EP AF FARCASIU, M SMITH, CM LADNER, EP TI CARBON MATERIALS AS CATALYSTS - ACTIVITY AND SELECTIVITY IN HYDROCRACKING REACTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE,PITTSBURGH ENERGY TECHNOL CTR,PITTSBURGH,PA 15236. SANDIA NATL LABS,DIV FUEL SCI,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 46 EP CATL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001029 ER PT J AU KING, GP AF KING, GP TI MANAGING OUR NATIONS NUCLEAR WASTE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE,WASHINGTON,DC 20585. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 46 EP CHAS PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001303 ER PT J AU LEE, K BELL, AT REIMER, JA AF LEE, K BELL, AT REIMER, JA TI HYDRODENITROGENATION OF QUINOLINE OVER HIGH-SURFACE AREA GAMMA-MO2N SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 47 EP CATL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001030 ER PT J AU STEINBERG, M GROHSE, EW AF STEINBERG, M GROHSE, EW TI CARBON-BLACK FROM COAL BY THE HYDROCARB PROCESS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 47 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001830 ER PT J AU HILL, JC WOHN, FK SMITH, AR AF HILL, JC WOHN, FK SMITH, AR TI ELECTROMAGNETIC DISSOCIATION WITH RELATIVISTIC HEAVY-IONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV CALIF BERKELEY,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 49 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100048 ER PT J AU GREENBAUM, E TEVAULT, CV AF GREENBAUM, E TEVAULT, CV TI PHOTOSYNTHETIC MOLECULAR ELECTRONICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 50 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000559 ER PT J AU RUPERT, DR AF RUPERT, DR TI SCIENCE-EDUCATION PROGRAM AT THE OAK-RIDGE-NATIONAL-LABORATORY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 50 EP CHAS PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001307 ER PT J AU ALVISO, CT PEKALA, RW AF ALVISO, CT PEKALA, RW TI MELAMINE-FORMALDEHYDE AEROGELS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. NR 0 TC 0 Z9 1 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 51 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100953 ER PT J AU CUMMING, JB AF CUMMING, JB TI FORWARD AND TRANSVERSE ENERGIES IN RELATIVISTIC HEAVY-ION COLLISIONS AT 14.6 GEV/C PER NUCLEON SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RI Cumming, James/I-3358-2013 OI Cumming, James/0000-0001-6930-0958 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 51 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100050 ER PT J AU SCHLESINGER, Z COLLINS, RT ROTTER, LD HOLTZBERG, F FEILD, C WELP, U CRABTREE, GW LIU, JZ FANG, Y AF SCHLESINGER, Z COLLINS, RT ROTTER, LD HOLTZBERG, F FEILD, C WELP, U CRABTREE, GW LIU, JZ FANG, Y TI EXPERIMENTAL CONSTRAINTS ON THE THEORY OF HIGH-TEMPERATURE SUPERCONDUCTIVITY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,STCS,ARGONNE,IL 60439. IBM CORP,RES,YORKTOWN HTS,NY 10598. RI Collins, Reuben/O-2545-2014 OI Collins, Reuben/0000-0001-7910-3819 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 51 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100587 ER PT J AU MCCARTY, KF SHELTON, RN LIU, JZ RADOUSKY, HB AF MCCARTY, KF SHELTON, RN LIU, JZ RADOUSKY, HB TI INVESTIGATION OF SUPERCONDUCTING YBA2CU3O7 USING RAMAN-SPECTROSCOPY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,LIVERMORE,CA 94551. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RI McCarty, Kevin/F-9368-2012 OI McCarty, Kevin/0000-0002-8601-079X NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 52 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100588 ER PT J AU STECHEL, EB HYBERTSEN, MS FOULKES, MC SCHLUTTER, M AF STECHEL, EB HYBERTSEN, MS FOULKES, MC SCHLUTTER, M TI MODEL FOR THE ELECTRONIC STATES OF HIGH-TC CUPRATES AS PROBED BY X-RAY ABSORPTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,DIV 1151,ALBUQUERQUE,NM 87185. AT&T BELL LABS,MURRAY HILL,NJ 07974. RI Stechel, Ellen/B-1253-2012 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 53 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100589 ER PT J AU AILEYTRENT, KS MCGOWAN, CW LACHOWICZ, E MARKUSZEWSKI, R AF AILEYTRENT, KS MCGOWAN, CW LACHOWICZ, E MARKUSZEWSKI, R TI A STANDARD ADDITIONS METHOD FOR THE MEASUREMENT OF SULFATE PRODUCED DURING THE DETERMINATION OF SULFUR FORMS IN COAL USING PERCHLORIC-ACID SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. TENNESSEE TECHNOL UNIV,DEPT CHEM,COOKEVILLE,TN 38505. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 55 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001838 ER PT J AU SIDLE, WC AF SIDLE, WC TI KRIGING ESTIMATION OF DIFFERENTIAL THERMAL SIGNATURES OF TOTAL MERCURY IN CRYSTALLINE ROCK - CASE-STUDY - WALDOBORO-PLUTON-COMPLEX, MAINE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 US DOE,DIV ENVIRONM PROTECT,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 55 EP ENVR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001729 ER PT J AU DELMORE, JE APPELHANS, AD AF DELMORE, JE APPELHANS, AD TI MOLECULAR ANIONS AS SURFACE PROBES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 EG&G IDAHO INC,IDAHO FALLS,ID 83415. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 56 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100055 ER PT J AU ITON, LE TROUW, F BRUN, TO EPPERSON, JE WHITE, JW HENDERSON, SJ AF ITON, LE TROUW, F BRUN, TO EPPERSON, JE WHITE, JW HENDERSON, SJ TI SMALL-ANGLE NEUTRON-SCATTERING STUDIES OF THE TEMPLATE-MEDIATED CRYSTALLIZATION OF ZSM-5 TYPE ZEOLITE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV PULSED NEUTRON SOURCE,ARGONNE,IL 60439. AUSTRALIAN NATL UNIV,CANBERRA,ACT 2600,AUSTRALIA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 58 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100449 ER PT J AU STEINBERG, EP AF STEINBERG, EP TI NUCLEAR CHEMISTRY, THE MET LAB, AND NATHAN SUGARMAN - A RETROSPECTIVE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 58 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100057 ER PT J AU CUMMING, JB AF CUMMING, JB TI RECOIL STUDIES AND HIGH-ENERGY REACTION MODELS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RI Cumming, James/I-3358-2013 OI Cumming, James/0000-0001-6930-0958 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 59 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100058 ER PT J AU HOLT, BD ABRAJANO, TA AF HOLT, BD ABRAJANO, TA TI CHEMICAL AND ISOTOPIC ALTERATION OF ORGANIC-MATTER DURING STEPPED COMBUSTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 61 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000430 ER PT J AU TURKEVICH, AL ECONOMOU, T COWAN, GA AF TURKEVICH, AL ECONOMOU, T COWAN, GA TI THE DOUBLE BETA-DECAY OF U-238 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. SANTA FE INST,SANTA FE,NM 87501. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 61 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100060 ER PT J AU FIGG, DJ SMITH, BF WANGEN, LE AF FIGG, DJ SMITH, BF WANGEN, LE TI LUMINESCENCE SPECTROSCOPY OF F-METAL COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,ANALYT CHEM GRP,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 62 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002115 ER PT J AU LOAR, JM AF LOAR, JM TI ECOLOGICAL RISK OF AQUATIC HABITAT DEGRADATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 62 EP ENVR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001736 ER PT J AU DAI, S BEGUN, G YOUNG, JP COFFIELD, JE MAMANTOV, G AF DAI, S BEGUN, G YOUNG, JP COFFIELD, JE MAMANTOV, G TI CHARACTERIZATION OF CHLOROMAGNESIUM SPECIES IN SEVERAL MOLTEN-SALT SYSTEMS BY RAMAN-SPECTROSCOPY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 64 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002117 ER PT J AU BARBOUR, JC KNAPP, JA DOYLE, BL AF BARBOUR, JC KNAPP, JA DOYLE, BL TI HIGH-ENERGY ION-SCATTERING FOR MATERIALS ANALYSIS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,DIV 1111,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 65 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100064 ER PT J AU COFFIELD, JE MAMANTOV, G DAI, S BEGUN, G YOUNG, JP AF COFFIELD, JE MAMANTOV, G DAI, S BEGUN, G YOUNG, JP TI DEVELOPMENT OF RAMAN FIBER OPTIC PROBES FOR HOSTILE ENVIRONMENTS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Dai, Sheng/K-8411-2015 OI Dai, Sheng/0000-0002-8046-3931 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 65 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000434 ER PT J AU ZHU, XY WHITE, JM CREIGHTON, JR AF ZHU, XY WHITE, JM CREIGHTON, JR TI HREELS STUDY OF TRIMETHYLGALLIUM AND ARSINE ON GAAS(100) SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 65 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001464 ER PT J AU COLTRIN, ME KEE, RJ AF COLTRIN, ME KEE, RJ TI NUMERICAL MODELING OF GAAS MOCVD SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. SANDIA NATL LABS,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 66 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001465 ER PT J AU MAGGIORE, CJ AF MAGGIORE, CJ TI CRYSTALLOGRAPHIC INFORMATION FROM ION CHANNELING SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 66 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100065 ER PT J AU MORSS, LR APPELMAN, EH GERZ, RR MARTINROVET, D AF MORSS, LR APPELMAN, EH GERZ, RR MARTINROVET, D TI STRUCTURAL STUDIES OF LI4NPO5 AND LI5NPO6 BY NEUTRON AND X-RAY-POWDER DIFFRACTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 68 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100067 ER PT J AU SMITH, DM DESHPANDE, R MAJORS, PD BRINKER, CJ EARL, WL DAVIS, PJ AF SMITH, DM DESHPANDE, R MAJORS, PD BRINKER, CJ EARL, WL DAVIS, PJ TI INSITU PORE STRUCTURE CHARACTERIZATION DURING SOL-GEL SYNTHESIS OF CONTROLLED POROSITY MATERIALS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV NEW MEXICO,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,DIV 1846,ALBUQUERQUE,NM 87185. UNIV CALIF LOS ALAMOS SCI LAB,CLS-1,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 68 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100459 ER PT J AU CREIGHTON, JR BANSE, BA AF CREIGHTON, JR BANSE, BA TI THE SURFACE-CHEMISTRY OF GAAS ATOMIC LAYER EPITAXY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,DIV 1126,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 69 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001468 ER PT J AU PETERSON, ES STONE, ML MCCAFFREY, RR CUMMINGS, DG AF PETERSON, ES STONE, ML MCCAFFREY, RR CUMMINGS, DG TI POLYPHOSPHAZENE MEMBRANES FOR CHEMICAL SEPARATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 EG&G IDAHO INC,IDAHO FALLS,ID 83401. CIBA CORNING DIAGNOST CORP,E WALPOLE,MA. RI Peterson, Eric/B-9127-2017 OI Peterson, Eric/0000-0002-2292-4939 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 70 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002123 ER PT J AU HANNINK, NJ HOFFMAN, DC SMITH, BF AF HANNINK, NJ HOFFMAN, DC SMITH, BF TI SEPARATION STUDIES OF SELECTED ACTINIDE IONS WITH 4-BENZOYL-5-METHYL-2-PHENYL-PYRAZOL-3-THIONE AND TRI-N-OCTYLPHOSPHINE OXIDE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. UNIV CALIF LOS ALAMOS SCI LAB,ANALYT CHEM GRP,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 73 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100072 ER PT J AU CZERWINSKI, KR GREGORICH, K HAMILTON, T HANNINK, NJ KACHER, CD KADKHODAYAN, BA KREEK, SA LEE, D NURMIA, M TURLER, A HOFFMAN, DC AF CZERWINSKI, KR GREGORICH, K HAMILTON, T HANNINK, NJ KACHER, CD KADKHODAYAN, BA KREEK, SA LEE, D NURMIA, M TURLER, A HOFFMAN, DC TI EXTRACTION OF RF (ELEMENT 104) AND ITS HOMOLOGS WITH TBP SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RI Turler, Andreas/D-3913-2014 OI Turler, Andreas/0000-0002-4274-1056 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 74 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100073 ER PT J AU FRENCH, DC DIECKMAN, SL GOPALSAMI, N BOTTO, RE AF FRENCH, DC DIECKMAN, SL GOPALSAMI, N BOTTO, RE TI NMR IMAGING - A CHEMICAL MICROSCOPE FOR COAL ANALYSIS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 75 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001858 ER PT J AU HAGAMAN, EW AF HAGAMAN, EW TI THE DETERMINATION OF LOCAL-STRUCTURE IN ORGANOFLUORIDES USING F-19 C-13 COUPLING SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 77 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001860 ER PT J AU MILLER, JR AF MILLER, JR TI INTRAMOLECULAR ELECTRON-TRANSFER AT FIXED DISTANCES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 77 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100613 ER PT J AU ENAS, JD GERDES, JM MATHIS, CA AF ENAS, JD GERDES, JM MATHIS, CA TI SYNTHETIC STUDIES OF ATIPAMEZOLE ANALOGS - FLUORINATION OF 5-SUBSTITUTED INDANONES AND INDANDIONES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720. RI Mathis, Chester/A-8607-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 78 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100171 ER PT J AU MILLER, JA MELIUS, CF AF MILLER, JA MELIUS, CF TI THE FORMATION OF BENZENE IN FLAMES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,LIVERMORE,CA 94551. NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 78 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001861 ER PT J AU ROHLFING, CM RAGHAVACHARI, K AF ROHLFING, CM RAGHAVACHARI, K TI THEORETICAL-STUDY OF SILICON CLUSTER ELECTRON-AFFINITIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,LIVERMORE,CA 94551. AT&T BELL LABS,MURRAY HILL,NJ 07974. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 79 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100615 ER PT J AU NIMLOS, MR BLAKE, D JACOBY, B NOBLE, RD AF NIMLOS, MR BLAKE, D JACOBY, B NOBLE, RD TI THE PHOTOINITIATED OXIDATION OF TRICHLOROETHYLENE OVER TIO2 - A POTENTIAL TECHNIQUE FOR THE SOLAR DETOXIFICATION OF GAS-PHASE WASTES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SOLAR ENERGY RES INST,DEPT CHEM,GOLDEN,CO 80401. UNIV COLORADO,BOULDER,CO 80309. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 82 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001481 ER PT J AU SUN, JJ FRITZ, JS AF SUN, JJ FRITZ, JS TI SELECTIVE ABSTRACTION OF MERCAPTAN COMPOUNDS BY CHEMICALLY MODIFIED POLYMERIC-MERCURIC RESIN IN CAPILLARY GAS-CHROMATOGRAPHY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 83 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000452 ER PT J AU KWINI, M COWIN, JP IEDEMA, M GILTON, TL AF KWINI, M COWIN, JP IEDEMA, M GILTON, TL TI FEMTOSECOND SOLVATION DYNAMICS OF CH3CL- AND CL- AT MULTILAYER SURFACES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 MICRON TECHNOL, BOISE, ID 83706 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 84 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100620 ER PT J AU HUNT, JE LYKKE, KR WINANS, RE AF HUNT, JE LYKKE, KR WINANS, RE TI CHARACTERIZATION OF COAL MACERALS BY LASER DESORPTION MASS-SPECTROMETRY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 88 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001871 ER PT J AU BUCHANAN, MV HETTICH, RL WISE, MB AF BUCHANAN, MV HETTICH, RL WISE, MB TI RAPID ANALYSIS USING DIRECT SAMPLING MASS-SPECTROMETRY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. RI Hettich, Robert/N-1458-2016 OI Hettich, Robert/0000-0001-7708-786X NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 89 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001872 ER PT J AU HARPEL, MR HARTMAN, FC AF HARPEL, MR HARTMAN, FC TI CHEMICAL RESCUE OF A CATALYTICALLY-DEFICIENT MUTANT OF R-RUBRUM RIBULOSE BISPHOSPHATE (RUBP) CARBOXYLASE OXYGENASE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 89 EP BIOL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000846 ER PT J AU HWANG, SJ KING, TS GERSTEIN, BC AF HWANG, SJ KING, TS GERSTEIN, BC TI USE AND LIMITATIONS OF N-QUANTUM COHERENCE IN PROBING INTERMEDIATES IN HETEROGENEOUS CATALYSIS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,INST PHYS RES & TECHNOL,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 89 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001488 ER PT J AU PRUSKI, M SANDERS, DK KING, TS GERSTEIN, BC AF PRUSKI, M SANDERS, DK KING, TS GERSTEIN, BC TI C-13 CP/MAS NMR-STUDIES OF CATALYTIC REACTIONS AT TEMPERATURES BETWEEN 90 AND 450-K SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 90 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001489 ER PT J AU BARKIGIA, KM FURENLID, LR MEDFORTH, CJ RENNER, MW SMITH, KM FAJER, J AF BARKIGIA, KM FURENLID, LR MEDFORTH, CJ RENNER, MW SMITH, KM FAJER, J TI CRYSTALLOGRAPHIC AND EXAFS STUDIES OF STERICALLY CROWDED PORPHYRINS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 91 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002144 ER PT J AU DELARUBIA, TD GUINAN, MW AF DELARUBIA, TD GUINAN, MW TI MOLECULAR-DYNAMICS COMPUTER-SIMULATION STUDIES OF COLLISION CASCADES IN SOLIDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 91 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100090 ER PT J AU FOO, C OKAMOTO, Y SKOTHEIM, T AF FOO, C OKAMOTO, Y SKOTHEIM, T TI IONIC-CONDUCTIVITY OF POLY(ETHYLENE OXIDE) BOUND WITH A STERICALLY HINDERED PHENOLATE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 POLYTECH INST NEW YORK,DEPT CHEM,BROOKLYN,NY 11201. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 91 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100993 ER PT J AU OKAMOTO, PR AF OKAMOTO, PR TI THERMODYNAMIC PARALLELS BETWEEN SOLID-STATE AMORPHIZATION AND MELTING SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 92 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100091 ER PT J AU RAMSEY, RS VANBERKEL, GJ AF RAMSEY, RS VANBERKEL, GJ TI DETERMINING PYRIMIDINE PHOTOPRODUCTS IN UV-IRRADIATED DNA SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 92 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000461 ER PT J AU NASTASI, M AF NASTASI, M TI TRIBOLOGICAL PROPERTIES OF STRUCTURES FORMED BY ION IRRADIATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 93 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100092 ER PT J AU GALUSKA, AA AF GALUSKA, AA TI ION-BEAM INDUCED INTERFACIAL CHEMICAL-COMPLEXES AND ADHESION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,DIV 1823,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 94 EP NUCL PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100093 ER PT J AU WATERS, LC SHAW, BJ CHANG, LY AF WATERS, LC SHAW, BJ CHANG, LY TI REGULATION OF DROSOPHILA-P450 GENES INVOLVED IN INSECTICIDE RESISTANCE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 97 EP AGRO PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000311 ER PT J AU BUTENHOFF, TJ ROHLFING, EA AF BUTENHOFF, TJ ROHLFING, EA TI MOLECULAR-BEAM STUDIES OF CARBONACEOUS CLUSTERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 110 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001892 ER PT J AU BOWMAN, MK AF BOWMAN, MK TI NEW APPLICATIONS OF COHERENT PULSED ELECTRON-PARAMAGNETIC RESONANCE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Bowman, Michael/F-4265-2011 OI Bowman, Michael/0000-0003-3464-9409 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 116 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100652 ER PT J AU BROCKMAN, FJ AF BROCKMAN, FJ TI EXPRESSION OF CLONED BIODEGRADATIVE GENES IN ISOLATES FROM DEEP SUBSURFACE ENVIRONMENTS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 117 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000626 ER PT J AU ORNSTEIN, RL PAULSEN, MD BASS, MB AF ORNSTEIN, RL PAULSEN, MD BASS, MB TI BIODEGRADATION OF HALOGENATED HYDROCARBONS BY RATIONAL REDESIGN OF CYTOCHROME-P450CAM SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 118 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000627 ER PT J AU CLAUSING, RE HEATHERLY, L HORTON, LL MORE, KL SPECHT, ED WANG, ZL AF CLAUSING, RE HEATHERLY, L HORTON, LL MORE, KL SPECHT, ED WANG, ZL TI STRUCTURAL CHARACTERIZATION OF CVD DIAMOND SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI Specht, Eliot/A-5654-2009; More, Karren/A-8097-2016 OI Specht, Eliot/0000-0002-3191-2163; More, Karren/0000-0001-5223-9097 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 119 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100655 ER PT J AU STEINBERG, M GROHSE, EW AF STEINBERG, M GROHSE, EW TI TREATMENT OF MSW BY HYDROCARB PROCESS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 121 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001903 ER PT J AU HO, P AF HO, P TI DECIPHERING A CHEMICAL VAPOR-DEPOSITION PROCESS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,DIV 1126,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 122 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002175 ER PT J AU MICHAEL, JV AF MICHAEL, JV TI THERMAL RATE-CONSTANT MEASUREMENTS BY THE FLASH OR LASER PHOTOLYSIS-SHOCK TUBE METHOD - RESULTS FOR THE OXIDATIONS OF H-2 AND D2 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Michael, Joe/E-3907-2010 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 123 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001905 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI PHOTOIONIZATION MASS-SPECTROMETRIC STUDIES OF THE COMBUSTION INTERMEDIATES CH2OH AND CH3O SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 124 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001906 ER PT J AU SALMERON, M AF SALMERON, M TI 2-DIMENSIONAL PHASES OF SULFUR FORMED BY COALESCENCE OF ATOMS ON RE(0001) SURFACES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 124 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100660 ER PT J AU SERPONE, N LAWLESS, D TERZIAN, R MEISEL, D AF SERPONE, N LAWLESS, D TERZIAN, R MEISEL, D TI HETEROGENOUS PHOTOCATALYSIS WITH TIO2 SEMICONDUCTOR PARTICLES IN AQUEOUS-MEDIA - A LOOK AT 2 RECENT CONTROVERSIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 CONCORDIA UNIV,DEPT CHEM,MONTREAL H3G 1M8,QUEBEC,CANADA. ARGONNE NATL LAB,DEPT CHEM,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 131 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001528 ER PT J AU SHIN, HK CHI, KM HAMPDENSMITH, MJ KODAS, TT FARKAS, J PAFFETT, MF FARR, JD AF SHIN, HK CHI, KM HAMPDENSMITH, MJ KODAS, TT FARKAS, J PAFFETT, MF FARR, JD TI SELECTIVE, LOW-TEMPERATURE CHEMICAL VAPOR-DEPOSITION OF COPPER FROM NEW COPPER(I) COMPOUNDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,DEPT CHEM ENGN,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 144 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002197 ER PT J AU HSU, WL AF HSU, WL TI MOLE FRACTION MEASUREMENTS OF H, CH3 AND OTHER SPECIES BY MOLECULAR-BEAM-MASS-SPECTROMETRY DURING HOT-FILAMENT ASSISTED DIAMOND FILM GROWTH SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 145 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100681 ER PT J AU GALLAGHER, KP ZHANG, XF RUNT, JP GIA, HB LIN, JS AF GALLAGHER, KP ZHANG, XF RUNT, JP GIA, HB LIN, JS TI COCRYSTALLIZATION IN BLENDS OF POLY(BUTYLENE TEREPHTHALATE) AND POLY(ESTER-ETHER) SEGMENTED BLOCK COPOLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 DUPONT CO,WILMINGTON,DE 19880. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 148 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101416 ER PT J AU SHAW, RW WHITTEN, WB RAMSEY, JM AF SHAW, RW WHITTEN, WB RAMSEY, JM TI LASER SPECTROSCOPIC DIAGNOSTICS FOR CHEMICAL VAPOR-DEPOSITION OF DIAMOND FILMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 151 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100687 ER PT J AU MEISEL, D GRIESER, F MULVANEY, P AF MEISEL, D GRIESER, F MULVANEY, P TI KINETIC EFFECTS OF ZETA-POTENTIAL ON INTERFACIAL ELECTRON-TRANSFER SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. UNIV MELBOURNE,DEPT PHYS CHEM,PARKVILLE,VIC 3052,AUSTRALIA. NR 0 TC 1 Z9 1 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 152 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001548 ER PT J AU BALKO, BA CROMWELL, EF STOLOW, A ZHANG, J VRAKKING, MJJ LEE, YT AF BALKO, BA CROMWELL, EF STOLOW, A ZHANG, J VRAKKING, MJJ LEE, YT TI DYNAMICS OF H2 ELIMINATION IN THE PHOTODISSOCIATION OF ETHYLENE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 163 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100698 ER PT J AU CHOI, YS KIM, SK LOVEJOY, N MOORE, CB AF CHOI, YS KIM, SK LOVEJOY, N MOORE, CB TI UNIMOLECULAR REACTION DYNAMICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 164 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100699 ER PT J AU BERGMAN, RG KYLE, KR MOORE, CB PIMENTEL, GC SPONSLER, MB WASSERMAN, EP WEILLER, BH AF BERGMAN, RG KYLE, KR MOORE, CB PIMENTEL, GC SPONSLER, MB WASSERMAN, EP WEILLER, BH TI PHOTOINDUCED C-H ACTIVATION IN METAL ORGANIC-SYSTEMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 167 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002220 ER PT J AU LEWIS, D SUMMERS, EA MERCERSMITH, JA COLE, DA STEPLEWSKI, Z THUNINGROBERSON, CA LAVALLEE, DK AF LEWIS, D SUMMERS, EA MERCERSMITH, JA COLE, DA STEPLEWSKI, Z THUNINGROBERSON, CA LAVALLEE, DK TI THE CYTOTOXICITY OF CU-67 PORPHYRIN-ANTIBODY CONJUGATES TO A COLON-CARCINOMA CELL-LINE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 WISTAR INST,PHILADELPHIA,PA 19104. CUNY HUNTER COLL,NEW YORK,NY 10021. UNIV CALIF LOS ALAMOS SCI LAB,NUCL & RADIOCHEM GRP INC11,LOS ALAMOS,NM 87545. GOODWIN INST,PLANTATION,FL 33136. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 168 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000674 ER PT J AU DANDY, DS COLTRIN, ME KEE, RJ AF DANDY, DS COLTRIN, ME KEE, RJ TI MODELING DIAMOND GROWTH IN PEDESTAL CVD REACTORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RI Dandy, David/G-6984-2012 OI Dandy, David/0000-0003-3254-0717 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 179 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100714 ER PT J AU BAKER, JO HIMMEL, ME AF BAKER, JO HIMMEL, ME TI THERMAL AND PH STRESS IN DENATURATION OF CELLOBIOHYDROLASE-I - PREDENATURATIONAL STRUCTURAL-CHANGES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SOLAR ENERGY RES INST,BIOTECHNOL RES BRANCH,GOLDEN,CO 80401. SOLAR ENERGY RES INST,DIV FUELS CHEM RES & ENGN,GOLDEN,CO 80401. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 191 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000698 ER PT J AU BRAUNSTEIN, M HAY, PJ PACK, RT MARTIN, RL AF BRAUNSTEIN, M HAY, PJ PACK, RT MARTIN, RL TI ABINITIO STUDIES OF THE 1A2 AND 1B1 STATES OF OZONE - A CONICAL INTERSECTION AND ITS EFFECT ON PHOTOABSORPTION AND DYNAMICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 191 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100726 ER PT J AU COTTS, PM AF COTTS, PM TI DYNAMIC LIGHT-SCATTERING-STUDIES OF RESORCINOL FORMALDEHYDE GELS AS PRECURSORS OF ORGANIC AEROGELS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95193. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 199 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101101 ER PT J AU KUBIAK, GD SCHULBERG, MT STULEN, RH AF KUBIAK, GD SCHULBERG, MT STULEN, RH TI STRUCTURE AND CHEMISTRY OF NATURAL DIAMOND SURFACES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,LIVERMORE,CA 94551. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 202 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100737 ER PT J AU ANEX, D LEWIN, M GOSALVEZ, D SMOLIAR, L LEE, YT AF ANEX, D LEWIN, M GOSALVEZ, D SMOLIAR, L LEE, YT TI MOLECULAR-BEAM STUDIES ON DIAMOND FILM SYNTHESIS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 203 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100738 ER PT J AU RYE, RR AF RYE, RR TI HOT FILAMENT ACTIVATED CVD OF BORON-NITRIDE AND CARBON SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 205 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100740 ER PT J AU BELL, AT WENT, GT AF BELL, AT WENT, GT TI EFFECTS OF CATALYST STRUCTURE ON THE PERFORMANCE OF V2O5/TIO2 CATALYSTS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 206 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001601 ER PT J AU FERRELL, TL AF FERRELL, TL TI PHOTON SCANNING TUNNELING MICROSCOPY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 210 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100745 ER PT J AU WENT, GT WENT, MS REIMER, J BELL, AT AF WENT, GT WENT, MS REIMER, J BELL, AT TI ACTIVATION OF AMMONIA ON V2O5/TIO2 CATALYSTS USED FOR THE SELECTIVE CATALYTIC REDUCTION OF NO SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 211 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001606 ER PT J AU FISHER, ER HO, P BUSS, RJ AF FISHER, ER HO, P BUSS, RJ TI LASER STUDIES OF THE REACTIVITY OF NH WITH THE SURFACE OF DEPOSITING FILMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 218 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001613 ER PT J AU BUTENHOFF, TJ ROHLFING, EA AF BUTENHOFF, TJ ROHLFING, EA TI SPECTROSCOPIC STUDIES OF FLOPPY MOLECULES - C-3 AND SIC2 SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 235 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100768 ER PT J AU NGUYEN, SN WEED, HC AF NGUYEN, SN WEED, HC TI DISSOLUTION KINETICS OF UO2.00 PELLETS AS A FUNCTION OF TIME, PH, CARBONATE BICARBONATE AND OXYGEN ACTIVITIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94551. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 236 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002289 ER PT J AU DESAI, SR FEIGERLE, CS AF DESAI, SR FEIGERLE, CS TI 2-PHOTON IONIZATION OF (NO)NARM CLUSTERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,CHEM PHYS SECT,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 251 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100784 ER PT J AU ASSINK, RA KAY, BD AF ASSINK, RA KAY, BD TI SOL-GEL KINETICS BY NMR SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 0 TC 0 Z9 0 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 256 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101155 ER PT J AU HAMPDENSMITH, MJ WARK, TA JONES, LC BRINKER, CJ RHEINGOLD, AL AF HAMPDENSMITH, MJ WARK, TA JONES, LC BRINKER, CJ RHEINGOLD, AL TI SOL-GEL CONDENSATION OF TIN(IV) ALKOXIDE COMPOUNDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,CTR MICROENGINEERED CERAM,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV DELAWARE,DEPT CHEM,NEWARK,DE 19711. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 258 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101157 ER PT J AU HUANG, JR VALENTINI, JJ MUCKERMAN, JT AF HUANG, JR VALENTINI, JJ MUCKERMAN, JT TI QUASI-CLASSICAL TRAJECTORY STUDIES OF THE H+CH4-]H2+CH3 REACTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 COLUMBIA UNIV,DEPT CHEM,NEW YORK,NY 10027. BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Muckerman, James/D-8752-2013 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 263 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100796 ER PT J AU JELINEK, R OZIN, GA PINES, A AF JELINEK, R OZIN, GA PINES, A TI ADSORBENT INTERACTIONS AND SPIN-LATTICE RELAXATION OF SODIUM-CATIONS IN ZEOLITE-Y PROBED BY DOUBLE-ROTATION NMR SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV TORONTO,LASH MILLER CHEM LABS,TORONTO M5S 1A1,ONTARIO,CANADA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 267 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100800 ER PT J AU JONES, AC CONAWAY, W STEVENS, C AF JONES, AC CONAWAY, W STEVENS, C TI LASER GENERATED HYDROCARBON PLASMAS - DETERMINATION OF TEMPERATURES BY C2 EMISSION-SPECTROSCOPY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 268 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100801 ER PT J AU MA, R ESPENSON, JH BAKAC, A AF MA, R ESPENSON, JH BAKAC, A TI KINETICS STUDIES OF THE REACTION OF ALKYL HYDROPEROXIDES WITH VANADIUM(IV) IN ACIDIC AQUEOUS-SOLUTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 276 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002329 ER PT J AU KIDD, KB PEDEN, CHF HARDCASTLE, FD HAMPDENSMITH, MJ AF KIDD, KB PEDEN, CHF HARDCASTLE, FD HAMPDENSMITH, MJ TI HYDROUS TITANATE CERAMIC POWDERS FROM MIXED ALKALI TITANIUM ALKOXIDE PRECURSORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 278 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002331 ER PT J AU NOVOA, JJ TARRON, B WHANGBO, MH WILLIAMS, JM AF NOVOA, JJ TARRON, B WHANGBO, MH WILLIAMS, JM TI C-H...O CONTACT INTERACTIONS IN MOLECULAR-SOLIDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV BARCELONA,DEPT QUIM FIS,BARCELONA 7,SPAIN. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RI Novoa, Juan/B-3525-2013 OI Novoa, Juan/0000-0003-3577-1182 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 295 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100828 ER PT J AU WOO, LK HAYS, JA JACOBSON, RA DAY, CL AF WOO, LK HAYS, JA JACOBSON, RA DAY, CL TI SYNTHESIS, REACTIVITY, AND STRUCTURAL CHARACTERIZATION OF THE 1ST TI(II) METALLOPORPHYRIN COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 298 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002351 ER PT J AU MAYA, L AF MAYA, L TI NITROGEN AND OR BORON-CONTAINING POLYMERS AS PRECURSORS OF CERAMIC MATERIALS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 315 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101214 ER PT J AU DAVIS, HF SUITS, AG HOU, H LEE, YT AF DAVIS, HF SUITS, AG HOU, H LEE, YT TI REACTIONS OF GROUND-STATE AND ELECTRONICALLY EXCITED BARIUM ATOMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 349 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100882 ER PT J AU VALONE, SM AF VALONE, SM TI SEMIEMPIRICAL MOLECULAR-ORBITAL AND TIGHT-BINDING METHODS IN DIAMOND SURFACE REACTIVITY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 356 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100889 ER PT J AU COLTRIN, ME DANDY, DS MEEKS, E KEE, RJ AF COLTRIN, ME DANDY, DS MEEKS, E KEE, RJ TI MODELING DIAMOND GROWTH - FROM ELEMENTARY MECHANISMS TO REACTOR MODELS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SANDIA NATL LABS,LIVERMORE,CA 94551. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RI Dandy, David/G-6984-2012 OI Dandy, David/0000-0003-3254-0717 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 357 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100890 ER PT J AU IJADIMAGHSOODI, S ZHANG, XP PANG, Y MEYER, M AKINC, M BARTON, TJ AF IJADIMAGHSOODI, S ZHANG, XP PANG, Y MEYER, M AKINC, M BARTON, TJ TI SILICON-ACETYLENE AND SILICON-OLEFIN POLYMERS AS PRECURSORS TO SIC SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 357 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101256 ER PT J AU MUELLER, KT AF MUELLER, KT TI SAMPLE REORIENTATION FOR HIGH-RESOLUTION NMR OF SOLIDS - DAS AND DOR SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 370 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100902 ER PT J AU TYCKO, R DABBAGH, G AF TYCKO, R DABBAGH, G TI NMR MEASUREMENTS OF ATOMIC CLUSTER DISTRIBUTIONS IN PSEUDOBINARY SEMICONDUCTOR ALLOYS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. SOLAR ENERGY RES INST,GOLDEN,CO 80401. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 375 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100907 ER PT J AU SHARMA, VK BIELSKI, BHJ AF SHARMA, VK BIELSKI, BHJ TI REACTIVITY OF FERRATE(VI) AND FERRATE(V) WITH AMINO-ACIDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 393 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002446 ER PT J AU HUSTON, P ESPENSON, JH BAKAC, A AF HUSTON, P ESPENSON, JH BAKAC, A TI KINETICS OF THIYL RADICAL FORMATION AND ELECTRON-TRANSFER REACTIONS BY FLASH-PHOTOLYSIS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 396 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002449 ER PT J AU CHAKRAVARTI, D IBEANU, GC TANO, K MITRA, S AF CHAKRAVARTI, D IBEANU, GC TANO, K MITRA, S TI CLONING AND EXPRESSION IN ESCHERICHIA-COLI OF A HUMAN CDNA-ENCODING THE DNA-REPAIR PROTEIN N-METHYLPURINE-DNA GLYCOSYLASE SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID MONOFUNCTIONAL ALKYLATING-AGENTS; 3-METHYLADENINE-DNA GLYCOSYLASE; ADAPTIVE RESPONSE; ALKA GENE; PURIFICATION; CELLS; RESISTANT; FRAGMENTS; INDUCTION; ACID AB A 871-base pair cDNA encoding the human N-methylpurine-DNA glycosylase (MPG) was cloned from a HeLa S3 cDNA expression library in a pUC vector by phenotypic screening of MPG-negative (tag- alkA-) Escherichia coli cells exposed to methylmethane sulfonate. The active MPG is expressed as a 31-kDa fusion protein. The human cDNA-encoded MPG releases 3-methyladenine, 7-methylguanine, and 3-methyl-guanine from DNA and thus has a substrate range similar to that of the indigenous enzyme and the E. coli AlkA protein. The cDNA hybridizes with distinct restriction fragments of mammalian DNAs but not with E. coli or yeast DNA. A search in the GenBank data bank failed to show any other cloned DNA with a similar sequence. Although the human protein has 62% sequence homology with the corresponding rat enzyme, only a few amino acid residues are conserved between the human protein and the E. coli and yeast MPGs. However, a conserved glutamine residue in all MPGs that release 3-alkyladenine and an arginine residue in eukaryotic MPGs and E. coli AlkA that act additionally on N-alkylguanines suggest that these residues are involved in recognition of adenine and guanine adducts in DNA, respectively. Although the 1.1-kilobase mRNAs of MPG from human and rodents are similar in size, liver and cultured cells of rat have much lower levels of MPG mRNA than do human and mouse cells. A hamster cell line variant isolated as being resistant to methylmethane sulfonate does not have a higher level of MPG mRNA than the parent cell line. C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. FU NCI NIH HHS [CA31721] NR 39 TC 124 Z9 128 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD AUG 25 PY 1991 VL 266 IS 24 BP 15710 EP 15715 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GB977 UT WOS:A1991GB97700032 PM 1874728 ER PT J AU FELDMAN, WC JAKOSKY, BM AF FELDMAN, WC JAKOSKY, BM TI DETECTABILITY OF MARTIAN CARBONATES FROM ORBIT USING THERMAL-NEUTRONS SO JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS LA English DT Article ID MARS; EVOLUTION; SPECTRA; CLIMATE; SYSTEM; WATER; CO2 AB Numerical simulations of Martian neutron leakage flux spectra are made in order to explore the detectability of magnesium and calcium carbonate deposits using neutron spectroscopic techniques from orbit. The primary signature of such deposits is found to be an enhanced thermal amplitude. Although this enhancement is weakened by (1) partial burial beneath an aeolian regolith blanket, (2) admixture with regolith on a microscopic (centimeter) or macroscopic (tens of centimeters) scale, and (3) reduction in the areal size of the deposit, near-surface stratigraphies of carbonates hypothesized by some authors as possible on Mars are still detectable by simple neutron sensors from orbit. However, the large variations in the magnitude of the thermal neutron enhancements caused by different carbonate deposit configurations found in this study require a combined gamma ray and neutron analysis for their unique specification. C1 UNIV COLORADO,ATMOSPHER & SPACE PHYS LAB,BOULDER,CO 80309. UNIV COLORADO,DEPT GEOL SCI,BOULDER,CO 80309. RP FELDMAN, WC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MS D438,LOS ALAMOS,NM 87545, USA. NR 25 TC 5 Z9 5 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-PLANET JI J. Geophys. Res.-Planets PD AUG 25 PY 1991 VL 96 IS E1 BP 15589 EP 15598 DI 10.1029/91JE00971 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GH507 UT WOS:A1991GH50700004 ER PT J AU CESS, RD POTTER, GL ZHANG, MH BLANCHET, JP CHALITA, S COLMAN, R DAZLICH, DA DELGENIO, AD DYMNIKOV, V GALIN, V JERRETT, D KEUP, E LACIS, AA LETREUT, H LIANG, XZ MAHFOUF, JF MCAVANEY, BJ MELESHKO, VP MITCHELL, JFB MORCRETTE, JJ NORRIS, PM RANDALL, DA RIKUS, L ROECKNER, E ROYER, JF SCHLESE, U SHEININ, DA SLINGO, JM SOKOLOV, AP TAYLOR, KE WASHINGTON, WM WETHERALD, RT YAGAI, I AF CESS, RD POTTER, GL ZHANG, MH BLANCHET, JP CHALITA, S COLMAN, R DAZLICH, DA DELGENIO, AD DYMNIKOV, V GALIN, V JERRETT, D KEUP, E LACIS, AA LETREUT, H LIANG, XZ MAHFOUF, JF MCAVANEY, BJ MELESHKO, VP MITCHELL, JFB MORCRETTE, JJ NORRIS, PM RANDALL, DA RIKUS, L ROECKNER, E ROYER, JF SCHLESE, U SHEININ, DA SLINGO, JM SOKOLOV, AP TAYLOR, KE WASHINGTON, WM WETHERALD, RT YAGAI, I TI INTERPRETATION OF SNOW-CLIMATE FEEDBACK AS PRODUCED BY 17 GENERAL-CIRCULATION MODELS SO SCIENCE LA English DT Article AB Snow feedback is expected to amplify global warming caused by increasing concentrations of atmospheric greenhouse gases. The conventional explanation is that a warmer Earth will have less snow cover, resulting in a darker planet that absorbs more solar radiation. An intercomparison of 17 general circulation models, for which perturbations of sea surface temperature were used as a surrogate climate change, suggests that this explanation is overly simplistic. The results instead indicate that additional amplification or moderation may be caused both by cloud interactions and longwave radiation. One measure of this net effect of snow feedback was found to differ markedly among the 17 climate models, ranging from weak negative feedback in some models to strong positive feedback in others. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. CANADIAN CLIMATE CTR,TORONTO M3H 574,ONTARIO,CANADA. LAB METEOROL DYNAM,F-75231 PARIS 05,FRANCE. BUR METEOROL RES CTR,MELBOURNE,VIC 3001,AUSTRALIA. COLORADO STATE UNIV,FT COLLINS,CO 80523. NASA,GODDARD INST SPACE STUDIES,NEW YORK,NY 10025. ACAD SCI USSR,DEPT NUMERICAL MATH,MOSCOW 119034,USSR. HADLEY CTR CLIMATE PREDICT & RES,METEOROL OFF,BRACKNELL RG12 2SZ,BERKS,ENGLAND. MAX PLANCK INST METEOROL,W-2000 HAMBURG 13,GERMANY. SUNY ALBANY,ALBANY,NY 12222. CTR NATL RECH MET,DIRECT METEOROL NAT,F-31057 TOULOUSE,FRANCE. LENINGRAD MAIN GEOPHYS OBSERV,LENINGRAD 194018,USSR. EUROPEAN CTR MEDIUM RANGE WEATHER FORECASTS,READING RG2 92X,BERKS,ENGLAND. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. UNIV READING,READING RG6 2AU,ENGLAND. NATL CTR ATMOSPHER RES,BOULDER,CO 80307. PRINCETON UNIV,NOAA,GEOPHYS FLUID DYNAM LAB,PRINCETON,NJ 08544. METEOROL RES INST,TSUKUBA,IBARAKI 305,JAPAN. RP CESS, RD (reprint author), SUNY STONY BROOK,INST TERR & PLANETARY ATMOSPHERES,STONY BROOK,NY 11794, USA. RI Taylor, Karl/F-7290-2011; Del Genio, Anthony/D-4663-2012; Lacis, Andrew/D-4658-2012; Randall, David/E-6113-2011; Norris, Peter/H-2008-2012 OI Taylor, Karl/0000-0002-6491-2135; Del Genio, Anthony/0000-0001-7450-1359; Randall, David/0000-0001-6935-4112; Norris, Peter/0000-0001-6807-9884 NR 7 TC 121 Z9 126 U1 4 U2 19 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD AUG 23 PY 1991 VL 253 IS 5022 BP 888 EP 892 DI 10.1126/science.253.5022.888 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GC152 UT WOS:A1991GC15200040 PM 17751825 ER PT J AU PECHMANN, JHK SCOTT, DE SEMLITSCH, RD CALDWELL, JP VITT, LJ GIBBONS, JW AF PECHMANN, JHK SCOTT, DE SEMLITSCH, RD CALDWELL, JP VITT, LJ GIBBONS, JW TI DECLINING AMPHIBIAN POPULATIONS - THE PROBLEM OF SEPARATING HUMAN IMPACTS FROM NATURAL FLUCTUATIONS SO SCIENCE LA English DT Article ID SALAMANDER AMBYSTOMA-TALPOIDEUM; DENSITY-DEPENDENT GROWTH; SUMMER HOME RANGE; TERRESTRIAL ACTIVITY; TIGER SALAMANDER; COMPETITION; LARVAL; PREDATION; METAMORPHOSIS; COMMUNITIES AB Reports of declining amphibian populations in many parts of the world are numerous, but supporting long-term census data are generally unavailable. Census data from 1979 to 1990 for three salamander species and one frog species at a breeding pond in South Carolina showed fluctuations of substantial magnitude in both the size of breeding populations and in recruitment of juveniles. Breeding population sizes exhibited no overall trend in three species and increased in the fourth. Recent droughts account satisfactorily for an increase in recruitment failures. These data illustrate that to distinguish between natural population fluctuations and declines with anthropogenic causes may require long-term studies. C1 UNIV OKLAHOMA,OKLAHOMA MUSEUM NAT HIST,NORMAN,OK 73019. UNIV OKLAHOMA,DEPT ZOOL,NORMAN,OK 73019. DUKE UNIV,DEPT ZOOL,DURHAM,NC 27706. UNIV ZURICH,INST ZOOL,CH-8057 ZURICH,SWITZERLAND. RP PECHMANN, JHK (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,PO DRAWER E,AIKEN,SC 29802, USA. OI Semlitsch, Raymond/0000-0002-7999-5762 NR 46 TC 474 Z9 493 U1 6 U2 78 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD AUG 23 PY 1991 VL 253 IS 5022 BP 892 EP 895 DI 10.1126/science.253.5022.892 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GC152 UT WOS:A1991GC15200041 PM 17751826 ER PT J AU STOUTLAND, PO LAMBRY, JC MARTIN, JL WOODRUFF, WH AF STOUTLAND, PO LAMBRY, JC MARTIN, JL WOODRUFF, WH TI FEMTOSECOND DYNAMICS OF REDUCED CYTOCHROME-OXIDASE AND ITS CO DERIVATIVE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID HEME-PROTEINS; HISTIDINE LIGANDS; HEMOGLOBIN; PHOTOPHYSICS; REACTIVITY; ABSORPTION; MYOGLOBIN; PROTOHEME; IDENTIFICATION; BINDING AB The photodissociation dynamics of reduced CO-ligated and reduced unligated cytochrome c oxidase (ferrocytochrome c:O2 oxidoreductase, cytochrome aa3, or CcO) and subsequent thermal reactivity have been studied with femtosecond UV-visible absorption spectroscopy. In both the unligated and the CO-ligated derivatives, we observe transients due to excited-state formation/decay and ligand photodissociation/rebinding reactions which occur at both of the heme centers (cytochromes a and a3) in this enzyme. For cytochrome a, transients are observed that decay biexponentially with time constants of 3-5 and 20 ps. These are assigned to fast excited-state decay with loss of axial histidine imidazole and subsequent axial ligand rebinding. In the case of CO-ligated CcO additional transients due to cytochrome a3 are observed. After the initial loss of CO (< 100 fs), a transient is observed that decays with a 6-ps time constant. This is assigned to a relaxation occurring at the cytochrome a3 site, perhaps caused by a ligand transfer to the cytochrome a3 site as has been suggested or to a local protein conformational change. Additional photophysics and the implications of the observed thermal reactions for the function of the enzyme are discussed. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV INORGAN & NUCL CHEM,MAIL STOP C-345,LOS ALAMOS,NM 87545. ECOLE POLYTECH,ECOLE NATL SUPER TECH AVANCEES,INSERM,U275,OPT APPL LAB,F-91128 PALAISEAU,FRANCE. NR 13 TC 27 Z9 27 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 22 PY 1991 VL 95 IS 17 BP 6406 EP 6408 DI 10.1021/j100170a004 PG 3 WC Chemistry, Physical SC Chemistry GA GC370 UT WOS:A1991GC37000004 ER PT J AU LOO, RRO UDSETH, HR SMITH, RD AF LOO, RRO UDSETH, HR SMITH, RD TI EVIDENCE OF CHARGE INVERSION IN THE REACTION OF SINGLY CHARGED ANIONS WITH MULTIPLY CHARGED MACROIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ION-ION RECOMBINATION; ELECTROSPRAY IONIZATION INTERFACE; CAPILLARY ZONE ELECTROPHORESIS; TANDEM MASS-SPECTROMETRY; TOTAL CROSS-SECTIONS; GAS-PHASE; CYTOCHROME-C; FLUORESCEIN; BIOMOLECULES; DISSOCIATION AB Novel gas-phase reactions were studied by mass spectrometry using merged gas streams containing oppositely charged species at near atmospheric pressure. Protonated adenosine 5'-monophosphate (AMP) and fluorescein molecules (M + H)+ are observed as products in the reaction of multiply charged macroions (M' + nH)n+ with species generated in the negative electrospray ionization of AMP or fluorescein. The (M + H)+ products most likely arise from charge inversion of (M - H)- anions in an ion-ion reaction. Protonated fluorescein and AMP were observed as a product of reaction with multiply protonated myoglobin, cytochrome c, and melittin but not with the less highly charged serine and bradykinin ions or other positively charged species of lower proton affinity from an air discharge. These observations suggest that the (M + H)+ products arise from charge inversion of (M - H)- anions in a single-step encounter of the negative ion with a multiply charged cation. C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 NR 46 TC 41 Z9 42 U1 2 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 22 PY 1991 VL 95 IS 17 BP 6412 EP 6415 DI 10.1021/j100170a006 PG 4 WC Chemistry, Physical SC Chemistry GA GC370 UT WOS:A1991GC37000006 ER PT J AU QIN, XZ TRIFUNAC, AD AF QIN, XZ TRIFUNAC, AD TI MEDIUM EFFECT ON THE JAHN-TELLER DISTORTIONS OF THE TETRAMETHYLALLENE RADICAL CATION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID DETECTED MAGNETIC-RESONANCE; ELECTRON-SPIN-RESONANCE; CYCLOHEXANE CATION; ABINITIO; LIQUID; ALLENE; MATRIX AB The Jahn-Teller distortion of the delocalized pi-radical cation tetramethylallene.+ (TMA.+) was found to be medium dependent. TMA.+ was studied in liquid hydrocarbons (195-295 K) by time-resolved fluorescence-detected magnetic resonance (FDMR) spectroscopy and in freon matrices (80-160 K) and zeolite Na-Y (80-298 K) by EPR spectroscopy. The observed coupling constants for the twelve protons of the four methyl groups of the radical cation are 11.3, 8.1, and 14.4 G, respectively. AM1 and INDO calculations suggest that different coupling constants can be explained by different twist angles in TMA.+. It is suggested that interaction between TMA.+ and the chlorine or fluorine atoms of freon matrices or between TMA.+ and the sodium atoms of the zeolite can influence the charge and spin distribution in the radical cation so that the structures that differ from that found in hydrocarbon solution can be stabilized. This is the first example of a Jahn-Teller-active radical cation that has been studied in several media. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 30 TC 13 Z9 13 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 22 PY 1991 VL 95 IS 17 BP 6466 EP 6469 DI 10.1021/j100170a016 PG 4 WC Chemistry, Physical SC Chemistry GA GC370 UT WOS:A1991GC37000016 ER PT J AU GROVER, JR HERRON, WJ COOLBAUGH, MT PEIFER, WR GARVEY, JF AF GROVER, JR HERRON, WJ COOLBAUGH, MT PEIFER, WR GARVEY, JF TI CLUSTER BEAM ANALYSIS VIA PHOTOIONIZATION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-BOMBARDMENT FRAGMENTATION; RESONANT 2-PHOTON IONIZATION; HYDROGEN-BONDED DIMERS; SUPERSONIC NOZZLE BEAM; FREE-JET EXPANSIONS; PHOTO-IONIZATION; VANDERWAALS COMPLEX; SCATTERING ANALYSIS; NUCLEOPHILIC-SUBSTITUTION; DISSOCIATION-ENERGIES AB A photoionization method for quantitatively analyzing the neutral products of free jet expansions is described. The basic principle is to measure the yield of an ion characteristic of each component cluster at a photon energy just below that at which production of the same ion from larger clusters can be detected. Since there is then no problem with fragmentation, the beam density of each neutral cluster can be measured in the presence of larger clusters. Although these measurements must be done in the test ions' onset regions where their yields are often quite small, the technique is made highly practicable by the large intensities of widely tunable vacuum-ultraviolet synchrotron light now available at electron storage rings. As an example, the method is applied to the analysis of cluster beams collimated from the free jet expansion of a 200:1 ammonia-chlorobenzene mixture. C1 SUNY BUFFALO, DEPT CHEM, BUFFALO, NY 14214 USA. RP GROVER, JR (reprint author), BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. NR 56 TC 12 Z9 12 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 22 PY 1991 VL 95 IS 17 BP 6473 EP 6481 DI 10.1021/j100170a018 PG 9 WC Chemistry, Physical SC Chemistry GA GC370 UT WOS:A1991GC37000018 ER PT J AU SCHWARZ, HA AF SCHWARZ, HA TI ENTHALPY AND ENTROPY OF FORMATION OF THE HYDRATED ELECTRON SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID WATER AB Pulse radiolysis was used to study the equilibrium of the reaction e(aq)- + NH4+ reversible H. + NH3 in aqueous solution between 4 and 87-degrees-C. The rate of equilibration was much larger than the subsequent radical decay. The equilibrium constant (corrected to zero ionic strength) is 2.2 at 25-degrees-C, DELTA-H-degrees is -2.0 kcal/mol, and DELTA-S-degrees is -5.1 cal/(deg mol). When combined with thermodynamic data for NH4+aq, NH3,aq, and H.aq, these values give DELTA-G-degrees f(e(aq-)) = 66.2 kcal/mol, DELTA-H-degrees f(e(aq-)) = 66.3 kcal/mol, and S-degrees(e(aq-)) = 16 cal/(deg mol). The enthalpy is 1-3.7 kcal/mol lower than recently published values based on kinetic studies. The forward and reverse rate constants of the reaction with ammonium ion are 1.0 x 10(6) and 0.67 x 10(6) M-1 s-1 at 0.05 M ionic strength and 25-degrees-C. The activation energy of the forward reaction is 7.2 kcal/mol. RP SCHWARZ, HA (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 22 TC 26 Z9 26 U1 2 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 22 PY 1991 VL 95 IS 17 BP 6697 EP 6701 DI 10.1021/j100170a058 PG 5 WC Chemistry, Physical SC Chemistry GA GC370 UT WOS:A1991GC37000058 ER PT J AU KANG, KS WHITE, AR AF KANG, KS WHITE, AR TI THE ODDERON VERSUS A NEW THRESHOLD - IMPLICATIONS FOR EXPERIMENTS AND FROM CONFINEMENT IN QCD SO PHYSICS LETTERS B LA English DT Article ID SCATTERING AB It is shown that a "new threshold" model, with a threshold at square-root S approximately 500 GeV, is compatible with all elastic scattering data. This implies that an odderon is not necessarily required by current experimental results. It is also argued that there is no forward odderon in QCD when confinement is taken into account. There is an odderon in SU (N) gauge theory for N greater-than-or-equal-to 4. C1 ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439. RP KANG, KS (reprint author), BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912, USA. NR 22 TC 2 Z9 2 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 AUG 22 PY 1991 VL 266 IS 1-2 BP 147 EP 152 DI 10.1016/0370-2693(91)90758-I PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GF212 UT WOS:A1991GF21200025 ER PT J AU SHAHAM, J TAVANI, M AF SHAHAM, J TAVANI, M TI ON THE NATURE AND EVOLUTION OF THE WINDY BINARY PULSAR PSR-1744-24A SO ASTROPHYSICAL JOURNAL LA English DT Article DE PULSARS; STARS, ECLIPSING BINARIES; STARS, INDIVIDUAL (PSR-1744-24A); X-RAYS, BINARIES ID X-RAY BINARIES; MILLISECOND PULSAR; MAGNETIC BRAKING; RADIATION AB We suggest that the companion of the pulsar PSR 1744-24A is a approximately 0.1 M. main-sequence star that slightly underfills its Roche lobe and is sending off a cool wind due to excitation by radiation from the pulsar. Unlike in the similarly excited system of pulsar PSR 1957 + 20, pulsar radiation pressure here almost balances wind pressure at the companion distance, leading to vastly fluctuating eclipse patterns and to occasional attempted accretion episodes that are aborted by the propeller effect and result in X-ray bursts. If this picture is correct, multiwavelength continuous observations of PSR 1744-24A will give valuable information about the accretion process onto neutron stars rotating with millisecond periods. C1 COLUMBIA UNIV,ASTROPHYS LAB,NEW YORK,NY 10027. UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. RP SHAHAM, J (reprint author), COLUMBIA UNIV,DEPT PHYS,538 W 120TH ST,NEW YORK,NY 10027, USA. OI Tavani, Marco/0000-0003-2893-1459 NR 19 TC 16 Z9 16 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 20 PY 1991 VL 377 IS 2 BP 588 EP 592 DI 10.1086/170387 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GA594 UT WOS:A1991GA59400023 ER PT J AU OSTRIKER, EC MCKEE, CF KLEIN, RI AF OSTRIKER, EC MCKEE, CF KLEIN, RI TI ISOTHERMAL, COMPTON-HEATED CORONAE ABOVE ACCRETION DISKS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION; GALAXIES, NUCLEI; RADIATION MECHANISMS; STARS, ACCRETION; STARS, CORONAE ID ACTIVE GALACTIC NUCLEI; WINDS; OUTBURSTS; EMISSION; EVOLUTION; QUASARS; MODELS AB We examine the structure of Compton-heated coronae above accretion disks by the development of both approximate analytic solutions and self-consistent numerical solutions to determine the direct and scattered radiation reaching the base of the corona for a range of central source luminosities. We generalize previous work by treating the case of a central X-ray source at a finite distance above the disk midplane, while allowing for both flat and flaring disks. The corona is assumed vertically isothermal, with temperature set to half of the local Compton temperature. Our solutions are self-consistent in that the attenuation of the radiation from the central source depends on the density distribution of the corona, which itself depends upon the attenuated central flux. Analytic solutions for the optical depth from source to disk in both optically thin and optically thick cases show excellent agreement with detailed numerical results. We treat only singly scattered radiation and evaluate the range of radii for which multiple scattering is not important, for a given luminosity. We find that the outer region of the corona is unaffected by multiple scattering in the interior, provided that the luminosity of the central source is sufficiently below the Eddington limit. For these luminosities, modification of the spectrum produced by the underlying disk due to the overlying corona is unimportant; for higher luminosities the effect may become significant. We determine how attenuation and scattering by the corona will affect the strength of chromospheric emission lines. We determine the condition for which the irradiation due to the central source exceeds the locally generated flux from the disk. Finally, we show that the stability analysis for irradiated accretion disks of Tuchman and coworkers is not substantially altered by the corona. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS & ASTRON,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 29 TC 29 Z9 29 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 AUG 20 PY 1991 VL 377 IS 2 BP 593 EP 611 DI 10.1086/170388 PN 1 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GA594 UT WOS:A1991GA59400024 ER PT J AU GAVRA, Z JOHNSON, JR REILLY, JJ AF GAVRA, Z JOHNSON, JR REILLY, JJ TI DECOMPOSITION KINETICS OF PALLADIUM NICKEL HYDRIDE SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS AB The kinetics of the decomposition of beta-Pd0.85Ni0.15Hx were determined under isothermal conditions. The experiments were carried out with a suspension of alloy particles in liquid undecane. The rate-limiting process is the solid state transformation taking place at the interface between the hydride and the hydrogen solid solution phase. The activation energy was 78 kJ mol-1; the pre-exponential in the Arrhenius expression is 4.38 x 10(9) s-1. The results are discussed in terms of the Polanyi-Wigner expression and the activated complex theory. It is proposed that the decomposition proceeds by the conversion of a group of approximately ten whole beta-phase unit cells to a corresponding group of whole alpha-phase unit cells. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. NR 9 TC 8 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 107 EP 115 PN A PG 9 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100014 ER PT J AU POWELL, GL HARPER, WL KIRKPATRICK, JR AF POWELL, GL HARPER, WL KIRKPATRICK, JR TI THE KINETICS OF THE HYDRIDING OF URANIUM METAL SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS ID HYDROGEN AB The reaction of massive uranium metal with hydrogen gas was studied using ultra-high vacuum, automated gas buret techniques, and linear rate data for this reaction are reported over a wide range of temperature (-10-250-degrees-C) and pressure (10 mPa- 1 MPa). The rate followed a half-power pressure dependence in the mid-range of pressures studied and was truncated at the limits of high and low pressures, and high temperatures. The hydriding rates are compared with data and calculations based on various models. One model, which qualitatively describes all the features of these data, is discussed in terms of how components contributing to the model can be adjusted to achieve a complete description of the data. At 21-degrees-C, reversible hydrogen sorption on the UH3 reaction product was detected from kinetic effects associated with restarting the hydriding process in the presence of the UH3 reaction product, and was shown to occur on pure UH3 in monolayer quantities. The relative yields of the alpha and beta-phases of UH3 were shown to be a function of the hydriding rate, with slower rates favoring beta-UH3 formation. C1 MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE GASEOUS DIFFUS PLANT,OAK RIDGE,TN 37831. RP POWELL, GL (reprint author), MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE Y12 PLANT,OAK RIDGE,TN 37831, USA. NR 9 TC 28 Z9 29 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 116 EP 123 PN A PG 8 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100015 ER PT J AU CANTRELL, JS BEITER, TA SOUERS, PC BARRY, P AF CANTRELL, JS BEITER, TA SOUERS, PC BARRY, P TI CRYSTALLOGRAPHIC STUDIES OF COMPOUNDS FROM THE LIH+BEH2 SYSTEM SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS ID LITHIUM BERYLLIUM HYDRIDE; ELECTRONIC-STRUCTURE; CRYSTAL-STRUCTURE; LIBEH3 AB Structural and phase studies were made of LiBeH3, Li2BeH4 and LiBeH5. Structural studies were carried out on powder X-ray diffraction data using a newly developed structure determination method based on a restricted minimization of the R factor. The atomic coordinates of the last two compounds are given, although those of the third structure, Li3BeH5, are still not complete. The structure types are given for the first two compounds (phases), LiBeH3 is an ilmenite (FeTiO3) and Li2BeH4 is essentially a phenacite (Be2SiO4) which is close in structure to the spinel, olivine (Mg2SiO4). C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550. RP CANTRELL, JS (reprint author), MIAMI UNIV,DEPT CHEM,OXFORD,OH 45056, USA. NR 16 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 213 EP 219 PN A PG 7 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100026 ER PT J AU HEMPELMANN, R RICHTER, D PRICE, DL AF HEMPELMANN, R RICHTER, D PRICE, DL TI KINETIC-ENERGY OF HYDROGEN IN BETA-V2H STUDIED BY NEUTRON COMPTON-SCATTERING SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS AB By means of the new technique of neutron Compton scattering we have determined the kinetic energy of hydrogen in beta-V2H. The resulting value agrees with that calculated from the vibrational ground state wavefunction which was derived from previously measured vibrational excitation energies. C1 ARGONNE NATL LAB,DIV PHYS & ELECT ENGN,ARGONNE,IL 60439. RP HEMPELMANN, R (reprint author), FORSCHUNGSZENTRUM JULICH GMBH,INST FESTKORPERFORSCH,W-5170 JULICH,GERMANY. RI Price, David Long/A-8468-2013; Richter, Dieter/H-3701-2013 OI Richter, Dieter/0000-0003-0719-8470 NR 7 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 301 EP 306 PN A PG 6 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100036 ER PT J AU RICHARDS, PM KAY, BD WAMPLER, WR AF RICHARDS, PM KAY, BD WAMPLER, WR TI UPTAKE AND RELEASE OF HYDROGEN IN PALLADIUM BY WEAKLY BOUND SITES SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS ID METAL INTERACTIONS; SURFACE; DESORPTION; PD(111); H-2; DISSOCIATION; KINETICS; D2 AB Evidence is reviewed for the role played in uptake and release by weakly bound sites, especially when the normal strong chemisorption sites are saturated. These weak sites seem to be much more effective in release than in uptake. It is not clear in all cases whether the sites are distinct subsurface sites or alternate sites on the surface, or whether there is a strong reduction in binding at high coverage which weakens the normal sites. RP RICHARDS, PM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 26 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 326 EP 332 PN A PG 7 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100039 ER PT J AU BELHOUL, M SCHOENBERGER, RJ TORGESON, DR BARNES, RG AF BELHOUL, M SCHOENBERGER, RJ TORGESON, DR BARNES, RG TI PROTON NUCLEAR-MAGNETIC-RESONANCE STUDY OF CRYSTAL-FIELD LEVELS IN PRASEODYMIUM HYDRIDES SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS ID ELECTRONIC-STRUCTURE; HYDROGEN DIFFUSION; METAL-HYDRIDES; RELAXATION; CERIUM; YH2 AB We report proton (H-1) T1 measurements in the temperature range 8 K less-than-or-equal-to T less-than-or-equal-to 300 K for PrH2.0 and PrH2.5, as well as for praseodymium-doped YH (double-similar 2). The measured temperature dependence of T1 in PrH2.0 and PrH2.5 is entirely accounted for by the proton spin interaction with fluctuating Pr3+ electronic moments, and its behavior in PrH2.0 differs markedly from that in PrH2.5. The non-zero magnetic moment of the crystalline electric field (CEF) ground state GAMMA-5 triplet in PrH2.0 causes the rate R1 = T1(-1) to increase with decreasing temperature, yielding very short T1 values ranging from 100-mu-s at 300 K to only 30-mu-s at 8 K. In PrH2.5 the orthorhombic CEF results in nine singlet levels, with the result that the H-1 T1 is roughly 1000 times longer than in PrH2.0, and its temperature dependence behaves in the opposite fashion, decreasing with increasing temperature from 250 ms at 8 K to 1 ms at 280 K to 1 ms at 280 K. In praseodymium-doped YH (double-similar 2) the magnitude and temperature dependence of R1p show the ground state CEF level to be a non-magnetic singlet. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP BELHOUL, M (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 366 EP 372 PN A PG 7 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100044 ER PT J AU BAKER, DB CONRADI, MS NORBERG, RE TORGESON, DR BARNES, RG AF BAKER, DB CONRADI, MS NORBERG, RE TORGESON, DR BARNES, RG TI NOVEL MEASUREMENTS OF NUCLEAR-SPIN CROSS-RELAXATION IN METAL-HYDRIDES SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS ID HYDROGEN DIFFUSION AB Recent NMR measurements of proton relaxation have shown an unexpected frequency dependence in several metal-hydrogen systems at low temperatures. An explanation proposed by the Ames group involves cross-relaxation of protons to quadrupolar metal nuclei. We test this hypothesis with relaxation experiments involving large amplitude field modulation. The field modulation sweeps the proton resonance through the distribution of metal frequencies. Thus the protons come into contact with more metal nuclei, increasing the proton relaxation rate. Relaxation measurements have been performed on several samples and the proton resonance frequency, the modulation frequency and the modulation amplitude have been varied. Also, proton relaxation rates T1(-1) have been measured on slowly spinning samples where the rotation produces periodic variations of the metal quadrupolar frequencies. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP BAKER, DB (reprint author), WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130, USA. NR 16 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 379 EP 386 PN A PG 8 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100046 ER PT J AU BARNES, RG CHANG, CT BELHOUL, M TORGESON, DR SCHOENBERGER, RJ BEAUDRY, BJ SEYMOUR, EFW AF BARNES, RG CHANG, CT BELHOUL, M TORGESON, DR SCHOENBERGER, RJ BEAUDRY, BJ SEYMOUR, EFW TI MAGNETIC-RESONANCE DETERMINATION OF THE ELECTRONIC DENSITY OF STATES AND THE METAL NONMETAL TRANSITION IN THE LAH2-LAH3 SYSTEM SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS ID HYDROGEN DIFFUSION; HYDRIDES; RELAXATION; LANTHANUM; YH2 AB Proton spin-lattice relaxation rate R1 and La-139 Knight shift measurements have been utilized to study the electronic density of states N(E(F)) at the Fermi level and the metal-non-metal (MNM) transition in the lanthanum hydrides, LaH(x)(2 less-than-or-equal-to x less-than-or-equal-to 3), in samples prepared from highest purity Ames Laboratory lanthanum as well as from lanthanum containing controlled low levels (less than 300 ppm) of gadolinium. In the pure samples, free-electron-like metallic behavior is found for all compositions up to x almost-equal-to 2.8 at temperatures T less-than-or-equal-to 200 K. In the gadolinium-doped samples the Gd3+ ion spin fluctuations, characterized by the ion spin-lattice relaxation time tau-i, contribute an additional proton spin relaxation rate. Measurements of this rate for x < 2.8 show that tau-i is-proportional-to T-1 at all temperatures, indicating metallic behavior. However, for x greater-than-or-equal-to 2.8 and T > 250 K, tau-i is-proportional-to T-5, showing that Gd3+ spin relaxation is then governed by the two-phonon process typical of insulating solids. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. RP BARNES, RG (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 13 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 411 EP 418 PN A PG 8 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100050 ER PT J AU JOHNSON, JR REILLY, JJ GAVRA, Z YANG, XQ AF JOHNSON, JR REILLY, JJ GAVRA, Z YANG, XQ TI PREPARATION AND PROPERTIES OF COMPOUNDS OF THE COMPLEX METAL-OXIDES Y2BAMO5 (M = CU, ZN) WITH ADDED HYDROGEN SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS ID HXYBA2CU3O7 AB The complex metal oxides Y2BaMO5(M = Cu, Zn) have been found to react directly with H-2 gas to form crystalline hydrogen addition compounds. X-ray diffraction data for HxY2BaCuO5 indicate that the reaction sequence for this oxide consists of the formation of a solid solution phase up to x almost-equal-to 2.1, in which the partial molar volume of H, V(H)BAR, is nearly zero, followed by the precipitation of a hydrogen-rich phase. The maximum H-2 uptake achieved to date corresponds to H3.9Y2BaCuO5. Similar diffraction studies of the HxY2BaZnO5 system indicate the presence of a solid solution phase to x = 2.0, which is the maximum hydrogen content so far achieved for this oxide; here V(H)BAR is also approximately zero. Neither hydriding reaction is reversible and attempts to remove hydrogen at elevated temperatures lead to the evolution of water and a partial reduction of the compound. IR absorption experiments for the Hx(D(x))Y2BaCuO5 system in the solid solution region indicate that hydrogen (deuterium) is most likely bound to both oxygen and copper. IR studies of H0.3Y2BaZnO5 show the presence of OH (hydroxyl) type bonding only. C1 NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. RP JOHNSON, JR (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 433 EP 439 PN A PG 7 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100053 ER PT J AU MIKLICH, AH KINGSTON, JJ WELLSTOOD, FC CLARKE, J COLCLOUGH, MS CHAR, K ZAHARCHUK, G AF MIKLICH, AH KINGSTON, JJ WELLSTOOD, FC CLARKE, J COLCLOUGH, MS CHAR, K ZAHARCHUK, G TI SENSITIVE YBA2CU3O7-X THIN-FILM MAGNETOMETER SO APPLIED PHYSICS LETTERS LA English DT Article ID DC SQUIDS; NOISE AB Our YBa2Cu3O7-x thin-film magnetometer consists of a dc superconducting quantum interference device with bi-epitaxial Josephson junctions, fabricated on one chip, and a flux transformer with a multiturn input coil, fabricated on a second chip. Photolithographic processing is used to pattern all layers. The magnetometer operates in a flux-locked loop at temperatures up to 81 K, with the flux transformer improving the magnetic field sensitivity by a factor of 83 +/- 3. The low-frequency rms magnetic field noise scales approximately as 1/f1/2, where f is the frequency, with a magnitude of 0.6 pT Hz-1/2 at 10 Hz and 0.09 pT Hz-1/2 at 1 kHz with the magnetometer immersed in liquid N2. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. CONDUCTUS INC,SUNNYVALE,CA 94086. RP MIKLICH, AH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Joint Quantum Institute, NIST/UMD/H-4494-2011 NR 13 TC 61 Z9 61 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 19 PY 1991 VL 59 IS 8 BP 988 EP 990 DI 10.1063/1.106323 PG 3 WC Physics, Applied SC Physics GA GB296 UT WOS:A1991GB29600036 ER PT J AU REYNOLDS, JG AF REYNOLDS, JG TI MODELING HYDRODESULFURIZATION, HYDRODENITRIFICATION AND HYDRODEMETALATION SO CHEMISTRY & INDUSTRY LA English DT Article ID THIOPHENE HYDRODESULFURIZATION; CATALYTIC HYDRODESULFURIZATION; CLUSTER COMPOUNDS; MECHANISM; 2,3-DIHYDROTHIOPHENE; DESULFURIZATION; DEMETALLIZATION; COMPLEXES; NITROGEN; LIGANDS RP REYNOLDS, JG (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 42 TC 24 Z9 24 U1 1 U2 3 PU SOC CHEMICAL INDUSTRY PI LONDON PA 14 BELGRAVE SQUARE, LONDON, ENGLAND SW1X 8PS SN 0009-3068 J9 CHEM IND-LONDON JI Chem. Ind. PD AUG 19 PY 1991 IS 16 BP 570 EP 574 PG 5 WC Chemistry, Applied SC Chemistry GA GB803 UT WOS:A1991GB80300005 ER PT J AU WEINBERG, AM AF WEINBERG, AM TI ORIGINS OF CRITERIA FOR SCIENTIFIC CHOICE - A CITATION-CLASSIC COMMENTARY ON CRITERIA FOR SCIENTIFIC CHOICE BY WEINBERG,A.M. SO CURRENT CONTENTS/ARTS & HUMANITIES LA English DT Article RP WEINBERG, AM (reprint author), OAK RIDGE ASSOCIATED UNIV,POB 117,OAK RIDGE,TN 37831, USA. NR 7 TC 2 Z9 2 U1 0 U2 2 PU INST SCI INFORM INC PI PHILADELPHIA PA 3501 MARKET ST, PHILADELPHIA, PA 19104 SN 0163-3155 J9 CC/ART HUMAN PD AUG 19 PY 1991 IS 17 BP 18 EP 18 PG 1 WC Humanities, Multidisciplinary; Multidisciplinary Sciences SC Arts & Humanities - Other Topics; Science & Technology - Other Topics GA FZ228 UT WOS:A1991FZ22800001 ER PT J AU ROBERGE, M ONEILL, TE BRADBURY, EM AF ROBERGE, M ONEILL, TE BRADBURY, EM TI INHIBITION OF 5S RNA-TRANSCRIPTION INVITRO BY NUCLEOSOME CORES WITH LOW OR HIGH-LEVELS OF HISTONE ACETYLATION SO FEBS LETTERS LA English DT Article DE HISTONE ACETYLATION; 5S RNA; INVITRO TRANSCRIPTION; GENE ACTIVATION; NUCLEOSOME ID XENOPUS-LAEVIS OOCYTES; POSITIONED NUCLEOSOMES; CHROMATIN STRUCTURE; STRUCTURE ACCOMPANY; 5S-RNA GENES; DNA; CONFORMATION; ACTIVATION; SEQUENCES; PROMOTER AB Nucleosomes exert strong inhibitory effects of gene transcription in vitro and in vivo. Since most DNA is packaged in nucleosomes, there must exist mechanisms to alleviate this inhibition during gene activation. Nucleosomes could be destabilized by histone acetylation which is strongly correlated with gene expression. We have compared the effects of nucleosomes cores with low or high levels of histone acetylation on 5S RNA transcription with Xenopus nuclear extracts in vitro. Little or no difference was observed over a range of 1 to 15 nucleosome cores per plasmid template. This result suggests that nucleosomal DNA is not more accessible to transcription factors and to the transcription machinery in acetylated nucleosomes. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. RP ROBERGE, M (reprint author), UNIV CALIF DAVIS,FAC MED,DEPT BIOL CHEM,DAVIS,CA 95616, USA. FU NIGMS NIH HHS [GM 26901] NR 37 TC 14 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0014-5793 J9 FEBS LETT JI FEBS Lett. PD AUG 19 PY 1991 VL 288 IS 1-2 BP 215 EP 218 DI 10.1016/0014-5793(91)81037-9 PG 4 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA GD736 UT WOS:A1991GD73600050 PM 1879554 ER PT J AU APFELDORF, KM AF APFELDORF, KM TI MULTIMATRIX MODELS FROM JET COEFFICIENTS SO NUCLEAR PHYSICS B LA English DT Article ID 2-DIMENSIONAL QUANTUM-GRAVITY; ONE DIMENSION; FIELD THEORY; STRINGS; SYMMETRIES; LESS AB We present a very natural framework in which to discuss multi-matrix models of two-dimensional quantum gravity. Multi-matrix model actions, string equations, and other quantities can be compactly expressed in terms of the jets of the resolvents of the relevant differential operators. This allows one to write down equations describing minimal matter coupled to two-dimensional quantum gravity directly in terms of known functionals. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP APFELDORF, KM (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 22 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 AUG 19 PY 1991 VL 360 IS 2-3 BP 480 EP 506 DI 10.1016/0550-3213(91)90412-Q PG 27 WC Physics, Particles & Fields SC Physics GA GA227 UT WOS:A1991GA22700012 ER PT J AU CHANG, D KEUNG, WY LIPOVACA, S SENJANOVIC, G AF CHANG, D KEUNG, WY LIPOVACA, S SENJANOVIC, G TI NEUTRINO MAGNETIC-MOMENT AND THE DICYCLIC GROUP SO PHYSICAL REVIEW LETTERS LA English DT Article ID NATURALLY SMALL MASS; RESONANT AMPLIFICATION; TRANSITION-MOMENT; GAUGE THEORIES; OKUN SOLUTION; SOLAR; MODEL; MATTER; NUMBER; OSCILLATIONS AB We show a mechanism using a discrete symmetry, the dicyclic group Q6, which naturally gives rise to a small mass but a large transitional magnetic moment for the neutrino such that the anticorrelation between the solar neutrino intensity and the sunspot activity can be explained. The process of muonium-antimuonium oscillation provides the most interesting constraint to the model besides neutrino physics. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. UNIV ZAGREB,DEPT THEORET PHYS,YU-41001 ZAGREB,YUGOSLAVIA. CERN,DIV THEORY,CH-1211 GENEVA 23,SWITZERLAND. RP CHANG, D (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 50 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 19 PY 1991 VL 67 IS 8 BP 953 EP 956 DI 10.1103/PhysRevLett.67.953 PG 4 WC Physics, Multidisciplinary SC Physics GA GB699 UT WOS:A1991GB69900006 ER PT J AU ROBERTSON, RGH BOWLES, TJ STEPHENSON, GJ WARK, DL WILKERSON, JF KNAPP, DA AF ROBERTSON, RGH BOWLES, TJ STEPHENSON, GJ WARK, DL WILKERSON, JF KNAPP, DA TI LIMIT ON VBARE MASS FROM OBSERVATION OF THE BETA-DECAY OF MOLECULAR TRITIUM SO PHYSICAL REVIEW LETTERS LA English DT Article ID FAST CHARGED-PARTICLES; NEUTRINO MASS; UPSILON-E; SPECTRUM; COLLISIONS; ENERGY AB We report the most sensitive direct upper limit set on the mass m(v) of the electron antineutrino. Our measurements of the shape of the beta-decay spectrum of free molecular tritium yield, under the assumption of no new physics other than that of mass, a central value for m(v)2 of -147 +/- 68 +/- 41 eV2, which corresponds to an upper limit or 9.3 eV (95% confidence level) on m(v). The result is in clear disagreement with a reported value of 26(5) eV. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV PHYS,LIVERMORE,CA 94550. RP ROBERTSON, RGH (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. NR 25 TC 126 Z9 126 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 AUG 19 PY 1991 VL 67 IS 8 BP 957 EP 960 DI 10.1103/PhysRevLett.67.957 PG 4 WC Physics, Multidisciplinary SC Physics GA GB699 UT WOS:A1991GB69900007 ER PT J AU LEVIN, JC LINDLE, DW KELLER, N MILLER, RD AZUMA, Y MANSOUR, NB BERRY, HG SELLIN, IA AF LEVIN, JC LINDLE, DW KELLER, N MILLER, RD AZUMA, Y MANSOUR, NB BERRY, HG SELLIN, IA TI MEASUREMENT OF THE RATIO OF DOUBLE-TO-SINGLE PHOTOIONIZATION OF HELIUM AT 2.8 KEV USING SYNCHROTRON RADIATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID DOUBLE IONIZATION; RARE-GASES; THRESHOLD; IMPACT AB We report the first measurement of the ratio of double-to-single photoionization of helium well above the double-ionization threshold. Using a time-of-flight technique, we find He++/He+ = 1.6% +/- 0.3% at hv = 2.8 keV. This value lies between calculations by Amusia (2.3%) and by Samson, who predicts 1.2% by analogy with electron-impact ionization cross sections of singly charged ions. Good agreement is obtained with older shake calculations of Byron and Joachain, and of Aberg, who predict 1.7%. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP LEVIN, JC (reprint author), UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996, USA. NR 26 TC 86 Z9 86 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 19 PY 1991 VL 67 IS 8 BP 968 EP 971 DI 10.1103/PhysRevLett.67.968 PG 4 WC Physics, Multidisciplinary SC Physics GA GB699 UT WOS:A1991GB69900010 ER PT J AU WHITTUM, DH SHARP, WM YU, SS LAMPE, M JOYCE, G AF WHITTUM, DH SHARP, WM YU, SS LAMPE, M JOYCE, G TI ELECTRON-HOSE INSTABILITY IN THE ION-FOCUSED REGIME SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHANNEL LASER; PLASMA; BEAM AB A relativistic electron beam propagating through an unmagnetized, underdense plasma exhibits a transverse instability due to the coupling of the beam centroid to plasma electrons at the "ion-channel" edge. The transverse wake field corresponding to this "electron-hose" effect is calculated in the "frozen-field" approximation for a low-current, cylindrical beam in a radially infinite plasma. The asymptotic growth of beam-centroid oscillations is computed, and the growth length is found to be very rapid, indeed much less than the betatron period of the beam. Results for a radially finite plasma and for a slab beam are noted. Damping and saturation mechanisms are discussed. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. USN,RES LAB,WASHINGTON,DC 20375. NR 33 TC 70 Z9 70 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 AUG 19 PY 1991 VL 67 IS 8 BP 991 EP 994 DI 10.1103/PhysRevLett.67.991 PG 4 WC Physics, Multidisciplinary SC Physics GA GB699 UT WOS:A1991GB69900016 ER PT J AU GOLDMAN, T NIETO, MM HOLZSCHEITER, MH DARLING, TM SCHAUER, M SCHECKER, J AF GOLDMAN, T NIETO, MM HOLZSCHEITER, MH DARLING, TM SCHAUER, M SCHECKER, J TI DOES ANTIMATTER FALL WITH THE SAME ACCELERATION AS ORDINARY MATTER - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Letter ID CONSTRAINTS RP GOLDMAN, T (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 13 TC 7 Z9 7 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 19 PY 1991 VL 67 IS 8 BP 1048 EP 1048 DI 10.1103/PhysRevLett.67.1048 PG 1 WC Physics, Multidisciplinary SC Physics GA GB699 UT WOS:A1991GB69900031 ER PT J AU RECHESTER, AB WHITE, RB AF RECHESTER, AB WHITE, RB TI SYMBOLIC KINETIC-ANALYSIS OF 2-DIMENSIONAL MAPS SO PHYSICS LETTERS A LA English DT Article ID CHIRIKOV-TAYLOR MODEL; DIFFUSION AB Symbolic dynamics is used to partition phase space for the Henon attractor and the Chirikov-Taylor map. The method used for constructing the generating partitions appears to be applicable to many dynamical systems. The discretized time evolution equation is used to calculate statistical properties such as the correlation function. C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 16 TC 22 Z9 23 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD AUG 19 PY 1991 VL 158 IS 1-2 BP 51 EP 56 DI 10.1016/0375-9601(91)90339-A PG 6 WC Physics, Multidisciplinary SC Physics GA GE326 UT WOS:A1991GE32600010 ER PT J AU VOHRA, Y AKELLA, J WEIR, S SMITH, GS AF VOHRA, Y AKELLA, J WEIR, S SMITH, GS TI A NEW ULTRA-HIGH PRESSURE PHASE IN SAMARIUM SO PHYSICS LETTERS A LA English DT Article ID CRYSTAL-STRUCTURE; METAL; GPA AB Structural changes in samarium under pressure were studied in a diamond-anvil cell (DAC) to 189 GPa. A number of phase transformations were observed between room pressure and 75GPa. At about 91 GPa samarium transforms to a body-centered tetragonal structure, and the unit cell parameters at 189 GPa are a = 2.402(4) angstrom and c = 4.231(17) angstrom, V = 24.40(12) angstrom3 and Z = 2. Identification of a body-centered tetragonal phase in Sm at about 90 GPa, which is similar to that reported in Ce, suggests that this phase could appear in other rare-earth elements too. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP VOHRA, Y (reprint author), CORNELL UNIV,DEPT MAT SCI,BARD HALL,ITHACA,NY 14853, USA. RI Weir, Samuel/H-5046-2012 NR 10 TC 18 Z9 18 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD AUG 19 PY 1991 VL 158 IS 1-2 BP 89 EP 92 DI 10.1016/0375-9601(91)90346-A PG 4 WC Physics, Multidisciplinary SC Physics GA GE326 UT WOS:A1991GE32600017 ER PT J AU MONCTON, DE AF MONCTON, DE TI A NOTE OF EXPLANATION SO SCIENTIST LA English DT Letter RP MONCTON, DE (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD AUG 19 PY 1991 VL 5 IS 16 BP 12 EP 12 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA GB066 UT WOS:A1991GB06600012 ER PT J AU CATTOLICA, RJ MATAGA, TG AF CATTOLICA, RJ MATAGA, TG TI ROTATIONAL-LEVEL-DEPENDENT QUENCHING OF OH A2-SIGMA(UPSILON'=1) BY COLLISIONS WITH H2O IN A LOW-PRESSURE FLAME SO CHEMICAL PHYSICS LETTERS LA English DT Article ID LASER-EXCITED FLUORESCENCE; RELAXATION COEFFICIENTS; VIBRATIONAL-RELAXATION; ATMOSPHERIC-PRESSURE; TEMPERATURES AB The collisional quenching of OH A 2-SIGMA-(upsilon' = 1) by H2O was determined from laser-induced fluorescence measurements in the burned-gas region of stoichiometric H-2/O2/Ar flames at low pressure (19 and 38 Torr). The collisional quenching was measured as a function of the initial laser-populated rotational level for N' = 4, 5, 8, 9, 10 and 11. The quenching cross section after laser excitation to N' = 4 is 32 +/- 2.5 angstrom 2 at a temperature of 1048 K, approximately 40% of its value at room temperature. The quenching cross section decreases by 17% as the initial laser-excited rotational level is increases from N' = 4 to N' = 11. This variation in quenching rate has a significant effect on the determination of OH rotational temperature from laser-excitation spectra. Accounting for the variation of quenching with rotational level reduces the rotational temperature by 10% at 1100 K. The collisional quenching cross section of OH A 2-SIGMA-(upsilon' = 1) by H atoms was calculated to be 10 +/- 3 angstrom 2 for N' = 5 at a temperature of 1048 K. RP CATTOLICA, RJ (reprint author), SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551, USA. NR 18 TC 25 Z9 25 U1 1 U2 6 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 AUG 16 PY 1991 VL 182 IS 6 BP 623 EP 631 DI 10.1016/0009-2614(91)90136-W PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GD674 UT WOS:A1991GD67400018 ER PT J AU GOUGEON, P GALL, P MCCARLEY, RE AF GOUGEON, P GALL, P MCCARLEY, RE TI STRUCTURE OF HO4MO4O11 SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID TERNARY MOLYBDENUM OXIDES; OCTAHEDRAL CLUSTER UNITS; INFINITE CHAINS; REDUCED TERNARY AB Ho4Mo4O11, M(r) = 1219.47, orthorhombic, Pbam, a = 10.683 (3), b = 15.848 (4), c = 5.6592 (1) angstrom, V = 958.1 (3) angstrom 3, Z = 4, D(x) = 8.453 g cm-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 380.3 cm-1, F(000) = 2096, T = 295 K, R = 0.018 for 1534 observed reflections. The title compound constitutes a new structure type containing infinite chains of trans-edge-shared Mo6 octahedra clusters. The latter show a pairwise distortion and are well separated from each other by the Ho3+ cations which are coordinated by seven O atoms forming a monocapped trigonal prism. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. US DOE,AMES LAB,AMES,IA 50011. RP GOUGEON, P (reprint author), UNIV RENNES 1,CHIM MINERALE LAB B,CNRS,URA 254,AVE GEN LECLERC,F-35042 RENNES,FRANCE. NR 22 TC 17 Z9 17 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD AUG 15 PY 1991 VL 47 BP 1585 EP 1588 DI 10.1107/S0108270191002342 PN 8 PG 4 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA GC569 UT WOS:A1991GC56900005 ER PT J AU GRDINA, DJ CARNES, BA GRAHN, D SIGDESTAD, CP AF GRDINA, DJ CARNES, BA GRAHN, D SIGDESTAD, CP TI PROTECTION AGAINST LATE EFFECTS OF RADIATION BY S-2-(3-AMINOPROPYLAMINO)-ETHYLPHOSPHOROTHIOIC ACID SO CANCER RESEARCH LA English DT Article ID WHOLE-BODY EXPOSURE; CO-60 GAMMA-RAY; V79 CELLS; HODGKINS-DISEASE; 2-<(AMINOPROPYL)AMINO> ETHANETHIOL; CHEMICAL PROTECTION; IONIZING-RADIATION; INDUCED MUTATIONS; ESCHERICHIA-COLI; WR-2721 AB We have demonstrated that S-2-(3-aminopropylamino)ethylphosphorothioic acid (WR2721) administered to mice 30 min prior to a relatively low dose of ionizing radiation is effective in protecting against radiation-induced carcinogenesis and subsequent life shortening. Female C57BL/6JANL x BALB/cJANL F1 mice, 200 per group, were exposed to gamma radiation at a dose of 206 cGy. Additional groups of 200 animals were sham treated, given injections of 400 mg/kg of WR2721, or administered WR2721 and the irradiated with Co-60 photons at doses of 206 cGy or 417 cGy. Mice were treated at 110 days of age. They were housed five to a cage and were checked daily throughout life. All deceased animals were necropsied, and tissues were removed and fixed for histopathological analysis. Over 90% of the animal deaths were due to tumor involvement. WR2721 afforded significant protection (P = 0.0016) against radiation-induced malignancies (i.e., a total of 164 tumor codes were used) following a dose of 206 cGy. Protection against lymphoreticular tumors in particular was significant (P = 0.0165). Subsequent survival time in WR2721-protected animals (compared with matched irradiated controls) was extended by 65 days. Mice irradiated with 417 cGy following administration of WR2721 exhibited a response similar to those irradiated without the protector at a dose of 206 cGy (P = 0.26). Cumulative survival curves for unirradiated mice were unaffected by a single dose of WR2721. These data indicate a potential novel benefit for radioprotectors in cancer therapy. WR2721 and similar aminothiols may be effective adjuvants for reducing the risk of therapy-induced secondary cancers in patients who have an excellent prognosis for cure and long-term survival. C1 UNIV CHICAGO,DEPT RADIAT & CELLULAR ONCOL,CHICAGO,IL 60637. UNIV LOUISVILLE,DEPT RADIAT ONCOL,LOUISVILLE,KY 40202. RP GRDINA, DJ (reprint author), ARGONNE NATL LAB,DIV BIOL & MED RES,ARGONNE,IL 60439, USA. FU NCI NIH HHS [CA-37435] NR 36 TC 51 Z9 51 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD AUG 15 PY 1991 VL 51 IS 16 BP 4125 EP 4130 PG 6 WC Oncology SC Oncology GA GA543 UT WOS:A1991GA54300001 PM 1651155 ER PT J AU PENNINGS, ECM DERI, RJ HAWKINS, RJ AF PENNINGS, ECM DERI, RJ HAWKINS, RJ TI SIMPLE METHOD FOR ESTIMATING USABLE BEND RADII OF DEEPLY ETCHED OPTICAL RIB WAVE-GUIDES SO ELECTRONICS LETTERS LA English DT Article DE WAVE-GUIDES; LOSSES ID WAVE-GUIDES AB An easy to use and extremely fast computational technique is presented for estimating the minimum usable radius of deeply etched, curved rib waveguides. This method is based on the effective index method and estimates the radius of curvature at which the bend becomes cut off due to substrate leakage. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP PENNINGS, ECM (reprint author), BELL COMMUN RES INC,331 NEWMAN SPRINGS RD,RED BANK,NJ 07701, USA. NR 7 TC 14 Z9 14 U1 0 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD AUG 15 PY 1991 VL 27 IS 17 BP 1532 EP 1534 DI 10.1049/el:19910962 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA GC497 UT WOS:A1991GC49700023 ER PT J AU RODRIGUEZ, AE MORGAN, WL TOURYAN, KJ MOENY, WM MARTIN, TH AF RODRIGUEZ, AE MORGAN, WL TOURYAN, KJ MOENY, WM MARTIN, TH TI AN AIR BREAKDOWN KINETIC-MODEL SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID NITROGEN; IONIZATION; COLLISIONS; DISCHARGE; MOLECULES; OXYGEN AB A kinetic model is developed for the glow phase of a spark gap in air. The model includes heavy-particle collisions leading to thermal ionization and electron-collision processes. Rates for the latter are calculated by a computer program that solves the electron Boltzmann equation, verified using empirical measurements. These rates include attachment and ionization, excitation followed by ionization of the excited species, and dissociation followed by ionization of the atomic species; molecular-impact detachment was found to be necessary to match experimental closing times. With those processes, the model predicts closing times well, over a wide range of voltages above and below the dc breakdown voltage. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP RODRIGUEZ, AE (reprint author), TETRA TECH INC,3701 HAWKINS ST NE,ALBUQUERQUE,NM 87109, USA. NR 23 TC 28 Z9 28 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 AUG 15 PY 1991 VL 70 IS 4 BP 2015 EP 2022 PG 8 WC Physics, Applied SC Physics GA GC098 UT WOS:A1991GC09800017 ER PT J AU WENK, HR LARSON, AC VERGAMINI, PJ SCHULTZ, AJ AF WENK, HR LARSON, AC VERGAMINI, PJ SCHULTZ, AJ TI TIME-OF-FLIGHT MEASUREMENTS OF PULSED NEUTRONS AND 2D DETECTORS FOR TEXTURE ANALYSIS OF DEFORMED POLYCRYSTALS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DIFFRACTION AB A method is described to measure deformation textures in polycrystals by time-of-flight of thermal neutrons with a 2d position sensitive detector. The procedure is illustrated for a standard sample of deformed calcite limestone and results from the Los Alamos Neutron Scattering Center and the Intense Pulsed Neutron Source at Argonne National Laboratory are compared with those from more conventional neutron diffraction experiments. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NEUTRON SCATTERING,LOS ALAMOS,NM 87545. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP WENK, HR (reprint author), UNIV CALIF BERKELEY,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720, USA. NR 17 TC 6 Z9 6 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 15 PY 1991 VL 70 IS 4 BP 2035 EP 2040 DI 10.1063/1.349462 PG 6 WC Physics, Applied SC Physics GA GC098 UT WOS:A1991GC09800020 ER PT J AU WARREN, WL LENAHAN, PM KANICKI, J AF WARREN, WL LENAHAN, PM KANICKI, J TI ELECTRICALLY NEUTRAL NITROGEN DANGLING-BOND DEFECTS IN AMORPHOUS HYDROGENATED SILICON-NITRIDE THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRON-SPIN-RESONANCE; PARAMAGNETIC DEFECTS; CORRELATION-ENERGY; 1ST OBSERVATION; MEMORY TRAPS; CENTERS; CHARGE; CONFIGURATIONS; ILLUMINATION; TRANSISTORS AB We have investigated the effects of different post-deposition temperature anneals and N-H concentrations, on the generation of ultraviolet (UV)-induced two-coordinated nitrogen dangling bonds in plasma-enhanced chemical vapor deposited (PECVD) silicon nitride films using electron spin resonance (ESR). It is shown that the nitrogen dangling bond is activated by post-deposition anneals with temperatures as low as 500-degrees-C in N-rich PECVD nitride films followed by subsequent UV broadband illumination. It also appears that there is a possible correlation between the initial N-H concentration in the films and the concentration of generated nitrogen dangling bonds following the anneal/UV sequence. We also report the charge state associated with the nitrogen dangling bond using a combination of ESR and capacitance versus voltage measurements; these measurements suggest that this two-coordinated defect is electrically neutral when paramagnetic. C1 PENN STATE UNIV,UNIVERSITY PK,PA 16802. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP WARREN, WL (reprint author), SANDIA NATL LABS,DIV ELECTR PROPERTIES MAT,ALBUQUERQUE,NM 87185, USA. RI Kanicki, Jerzy/E-2753-2016 OI Kanicki, Jerzy/0000-0002-3649-8360 NR 47 TC 42 Z9 42 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 AUG 15 PY 1991 VL 70 IS 4 BP 2220 EP 2225 DI 10.1063/1.349433 PG 6 WC Physics, Applied SC Physics GA GC098 UT WOS:A1991GC09800047 ER PT J AU BUTLER, MA BUSS, RJ GALUSKA, A AF BUTLER, MA BUSS, RJ GALUSKA, A TI PROPERTIES OF MICROMETER-THICK PLASMA-POLYMERIZED TETRAFLUOROETHYLENE FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Several physical properties of thin plasma-polymerized films have been measured using a new fiber-optic-based technique. Films of plasma-polymerized tetrafluoroethylene (PPTFE) deposited on the end of an optical fiber form an optical cavity, the reflectivity of which is very sensitive to the film thickness. The fiber is used as an in situ monitor of the deposition rate in the plasma and, after removal from the plasma, the mechanical properties of the film can be measured. With this measurement technique the thermal expansion of the film normal to its surface as well as the swelling of the film when exposed to an array of organic solvents have been determined. A significantly smaller thermal-expansion coefficient and larger degree of swelling are observed relative to bulk PTFE. X-ray photoelectron spectroscopy measurements show that the fluorocarbon chains are highly branched and have a fluorine-to-carbon ratio of 1.45. These results suggest that the plasma-polymerized films are not crystalline and are heavily cross linked. RP BUTLER, MA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 13 TC 26 Z9 26 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 15 PY 1991 VL 70 IS 4 BP 2326 EP 2332 DI 10.1063/1.349428 PG 7 WC Physics, Applied SC Physics GA GC098 UT WOS:A1991GC09800064 ER PT J AU SPICER, AP PARRY, G PATTON, S GENDLER, SJ AF SPICER, AP PARRY, G PATTON, S GENDLER, SJ TI MOLECULAR-CLONING AND ANALYSIS OF THE MOUSE HOMOLOG OF THE TUMOR-ASSOCIATED MUCIN, MUC1, REVEALS CONSERVATION OF POTENTIAL O-GLYCOSYLATION SITES, TRANSMEMBRANE, AND CYTOPLASMIC DOMAINS AND A LOSS OF MINISATELLITE-LIKE POLYMORPHISM SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID CARCINOMA-ASSOCIATED ANTIGEN; EPITHELIAL-CELL LINE; XENOPUS-LAEVIS; MONOCLONAL-ANTIBODIES; INTEGUMENTARY MUCIN; SEQUENCE-ANALYSIS; GENE; EXPRESSION; PROTEIN; CDNA AB We present here the full-length cDNA sequence and genomic structure of the mouse homologue of the tumor-associated mucin, MUC1. This mucin (previously called polymorphic epithelial mucin) is present at the apical surface of most glandular epithelial cells. The mouse gene, Muc-1, encodes an integral membrane protein with 40% of its coding capacity made up of serine, threonine, and proline, a composition typical of a highly O-glycosylated protein. The mucin core protein consists of an amino-terminal signal sequence, a tandem repeat domain encoding 16 repeats of 20-21 amino acids, and unique sequence containing transmembrane and cytoplasmic domains. Homology with the human protein is only 34% in the tandem repeat domain, mainly showing conservation of serines and threonines, presumed sites of O-linked carbohydrate attachment. Homology rises to 87% in the transmembrane and cytoplasmic domains, suggesting that these regions may be functionally important. The pattern of expression of the mouse mucin is very similar to that of its human counterpart and accordingly the two promoter regions share high homology, 74%, although previously identified potential hormone-responsive elements are not conserved. Interestingly, the mouse homologue, unlike its human counterpart does not exhibit a variable number tandem repeat polymorphism. We present evidence that suggests that the mouse gene was at one time polymorphic but has mutated away from this state. C1 IMPERIAL CANC RES FUND,MOLEC EPITHELIAL CELL BIOL LAB,POB 123,LINCOLNS INN FIELDS,LONDON WC2A 3PX,ENGLAND. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. CTR MOLEC GENET,SCH MED,DEPT NEUROSCI,LA JOLLA,CA 92093. NR 48 TC 193 Z9 198 U1 0 U2 1 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD AUG 15 PY 1991 VL 266 IS 23 BP 15099 EP 15109 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GB097 UT WOS:A1991GB09700048 PM 1714452 ER PT J AU LYKKE, KR KAY, BD AF LYKKE, KR KAY, BD TI 2-PHOTON SPECTROSCOPY OF N2 - MULTIPHOTON IONIZATION, LASER-INDUCED FLUORESCENCE, AND DIRECT ABSORPTION VIA THE A''1-SIGMA-G+ STATE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DIRECT INELASTIC-SCATTERING; ROTATIONAL DISTRIBUTIONS; MOLECULAR-HYDROGEN; DIATOMIC-MOLECULES; SIGMA-G+; N-2; AG(111); EXCITATION; NITROGEN; H-2 AB A new (2 + 1) resonantly enhanced multiphoton ionization (REMPI) process via the a" 1-SIGMA-g+ state of N2 with a quantum specific detection sensitivity of approximately 10(5) molecule cm-3 is reported. The resulting spectra are easily analyzed and yield directly the relative rotational and vibrational populations in the ground electronic state of N2. Additionally, both two-photon direct absorption (TPDA) to, and laser-induced fluorescence (LIF) from two-photon excitation of, the a" state of N2 are observed. These spectroscopies are compared with (2 + 1) REMPI and TPDA via the E,F state of H-2. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 38 TC 45 Z9 45 U1 0 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 1991 VL 95 IS 4 BP 2252 EP 2258 DI 10.1063/1.460981 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA108 UT WOS:A1991GA10800003 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI PHOTOIONIZATION MASS-SPECTROMETRIC STUDY OF SI2H6 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SEQUENTIAL CLUSTERING REACTIONS; HYDROGENATED SILICON PARTICLES; MOLECULAR-PROPERTIES; PROTONATED DISILYNE; LOWEST SINGLET; TRIPLET-STATES; DISILENE; STABILITY; SILANE; SIH3+ AB The adiabatic I.P. of Si2H6 obtained by a photoionization mass spectrometric study at two temperatures is 9.74 +/- 0.02 eV. The first fragment, Si2H4+, initially appears with a shallow slope at less-than-or-equal-to 10.04 +/- 0.02 eV, and with a much steeper slope at less-than-or-equal-to 10.81 + 0.02 eV. It is argued that the initial onset corresponds to formation of H2SiSiH2+, while the steeper onset is attributed to formation of H3SiSiH+. The second fragment, Si2H5, has an appearance potential of less-than-or-equal-to 11.59 +/- 0.02 eV (11.41 +/- 0.03 is a probable value). Successive decomposition leads to Si2H2+ (from Si2H4+) and Si2H3+ (from Si2H5+). The photoion yield curve for Si2H3+ also displays shallow and steep onsets. Upper limits for the appearance potentials can be readily extracted, but the true thermochemical onsets are less well defined. Heats of formation (or upper limits) are presented for each of these species. For Si2H6+, Si2H5+, and Si2H4+, the experimental values are in good agreement with recent ab initio calculations. For the daughter species, the experimental values exceed the calculated ones, as expected. RP RUSCIC, B (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 47 TC 27 Z9 27 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 AUG 15 PY 1991 VL 95 IS 4 BP 2407 EP 2415 DI 10.1063/1.460946 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA108 UT WOS:A1991GA10800020 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI PHOTOIONIZATION MASS-SPECTROMETRIC STUDIES OF THE TRANSIENT SPECIES SI2HN (N = 2-5) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CLUSTERING REACTIONS; PROTONATED DISILYNE; LOWEST SINGLET; GROUND-STATE; DISILENE; SILANE; RADICALS; BOND; THERMOCHEMISTRY; STABILITY AB The transient species Si2H5, Si2H4, Si2H3, and Si2H2 have been prepared for the first time, by reactions of F atoms with Si2H6. The species are generated in situ and studied by photoionization mass spectrometry. The adiabatic ionization potentials are (in eV) Si2H5, 7.60 +/- 0.05; Si2H4, 8.09 +/- 0.03; Si2H3, < 7.59; and Si2H2, 8.20(-0.02)+0.01. In addition, two fragment appearance potential curves were measured, Si2H3+ (Si2H5) and Si2H2+ (Si2H4). By combining these ionization potentials with appearance potentials obtained here and from Si2H6, the following heats of formation (kcal/mol at 0 K) have been inferred: Si2H5, < 63.3 (59.2); Si2H4, 67.9 +/- 0.9; Si2H3 (approximately 96); Si2H2, < 100.7 (90.2-95.6). The quantities in parentheses are probable values, but less well defined. Structures and structural changes resulting from photoionization are discussed. In particular, Si2H2 and its cation are very likely cyclic (doubly bridged). Heats of formation of cations are also obtained, from which the proton affinities of Si2H2 (199 +/- 3 kcal/mol) and Si2H4 (199.9 kcal/mol) are deduced. The structural and energetic differences between corresponding silicon and carbon hydrides are discussed in detail. RP RUSCIC, B (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Ruscic, Branko/A-8716-2008 OI Ruscic, Branko/0000-0002-4372-6990 NR 67 TC 68 Z9 68 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 AUG 15 PY 1991 VL 95 IS 4 BP 2416 EP 2432 DI 10.1063/1.460947 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA108 UT WOS:A1991GA10800021 ER PT J AU CURTISS, LA RAGHAVACHARI, K DEUTSCH, PW POPLE, JA AF CURTISS, LA RAGHAVACHARI, K DEUTSCH, PW POPLE, JA TI THEORETICAL-STUDY OF SI2HN (N=0-6) AND SI2HN+ (N=0-7) - APPEARANCE POTENTIALS, IONIZATION-POTENTIALS, AND ENTHALPIES OF FORMATION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SEQUENTIAL CLUSTERING REACTIONS; SMALL SILICON CLUSTERS; PROTONATED DISILYNE; MOLECULAR-ENERGIES; ELECTRONIC STATES; GAUSSIAN-1 THEORY; SILANE; PHOTOIONIZATION; DISILENE; HEATS AB The Gaussian-2 (G2) theoretical procedure, based on ab initio molecular-orbital theory, is used to calculate the energies of Si2H(n) (n = 0-6) and Si2H(n)+ (n = 0-7). The resulting G2 energies are used to calculate appearance potentials and ionization potentials. The results are in general agreement with the recent photoionization studies of Ruscic and Berkowitz [J. Chem. Phys. 95, 2407 (1991); 95, 2416 (1991)], supporting their observation of the species Si2H2, Si2H3, Si2H4, and Si2H5 for the first time. Atomization energies of the neutrals are calculated and used to derive enthalpies of formation. In most cases the results are in good agreement with previous theoretical values. In addition, new results for the structures of Si2H6+, Si2H3, and Si2H+, the enthalpies of formation of the cations, and proton affinities are presented. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. AT&T BELL LABS,MURRAY HILL,NJ 07974. PENN STATE UNIV,DEPT PHYS,MONACA,PA 15061. CARNEGIE MELLON UNIV,DEPT CHEM,PITTSBURGH,PA 15213. RP CURTISS, LA (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 46 TC 133 Z9 133 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 1991 VL 95 IS 4 BP 2433 EP 2444 DI 10.1063/1.460948 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA108 UT WOS:A1991GA10800022 ER PT J AU DARAKJIAN, Z HAYES, EF PARKER, GA BUTCHER, EA KRESS, JD AF DARAKJIAN, Z HAYES, EF PARKER, GA BUTCHER, EA KRESS, JD TI DIRECT CALCULATION OF COLLISIONAL PROPERTIES THAT REQUIRE ENERGY DERIVATIVES OF THE S-MATRIX - RESULTS FOR THE REACTION HE+H2+-REVERSIBLEHEH++H SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID REACTION PROBABILITIES; QUANTUM SCATTERING; CROSS-SECTIONS; RESONANCES; VERSION AB The Darakjian-Hayes direct method for determining quantum lifetimes for three atoms scattering in three physical dimensions is used to determine accurate state-to-state time delays for the reaction of helium with H2+ for total angular momentum J = 0. These results are compared with the time delays obtained by numerical differentiation of the S-matrix elements generated using the APH (adiabatically adjusting principal-axis hyperspherical) formulation of Pack and Parker. The direct method was found to be accurate and efficient for calculating the energy derivatives of the S matrix. The calculated eigenvalues of Smith's collision lifetime matrix (eigen lifetimes) for this reaction predict numerous long-lived metastable states, many with lifetimes over 0.5 ps. The extent of the coupling of metastable states to specific scattering states provides an indication of the nature and magnitude of the time delays associated with particular state-to-state scattering processes. The direct method for calculating the energy derivatives of the S matrix is also found to be accurate and efficient for determining the energy derivative of the cumulative reaction probability. C1 UNIV OKLAHOMA,DEPT PHYS & ASTRON,NORMAN,OK 73019. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP DARAKJIAN, Z (reprint author), RICE UNIV,DEPT CHEM,HOUSTON,TX 77251, USA. RI Parker, Gregory/A-4327-2009 OI Parker, Gregory/0000-0002-0225-8887 NR 20 TC 49 Z9 49 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 1991 VL 95 IS 4 BP 2516 EP 2522 DI 10.1063/1.460956 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA108 UT WOS:A1991GA10800031 ER PT J AU MACKAS, DL WASHBURN, L SMITH, SL AF MACKAS, DL WASHBURN, L SMITH, SL TI ZOOPLANKTON COMMUNITY PATTERN ASSOCIATED WITH A CALIFORNIA CURRENT COLD FILAMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID NORTHERN CALIFORNIA; VARIABILITY AB In July 1988 we sampled upper layer zooplankton distributions in and around a major cold filament located off Point Arena, California. Average zooplankton biomass levels declined inshore to offshore, but relatively high levels extended seaward along the cool side of the filament jet. A series of transverse station lines shows strong shifts in community composition across the axis of the filament. The cross-filament compositional sequence was recognizably similar along each line, giving an impression (supported by cluster analysis and along-flow versus cross-flow spatial autocorrelation) of banding parallel to the filament axis. The "standard" sequence was characterized by local maxima of Dolioletta gegenbauri in nonfilament waters to the south and east, Euphausia pacifica along the southeast margin of the filament, Eucalanus californicus and euphausiid larvae within the cool core of the filament and extending partway across the strong seaward jet on the north and west margin of the filament, and heteropod larvae, chaetognaths, Dolioletta, and a mixture of small copepods (including several with southern and offshore faunal affinities) along the warm side of the jet and extending into nonfilament waters to the north and west. A "core" group of samples characterized by high abundance of Eucalanus matched the trajectories of drifters released at the upstream end of the filament. Both crossed geopotential anomaly contours (to larger phi) as they moved out the filament, suggesting a cross-jet component of motion. C1 FISHERIES & OCEANS CANADA INST OCEAN SCI, SIDNEY V8L 4B2, BC, CANADA. UNIV SO CALIF, DEPT GEOL SCI, LOS ANGELES, CA 90089 USA. BROOKHAVEN NATL LAB, DIV OCEANOG & ATMOSPHER SCI, UPTON, NY 11973 USA. NR 23 TC 59 Z9 59 U1 1 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9275 EI 2169-9291 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD AUG 15 PY 1991 VL 96 IS C8 BP 14781 EP 14797 DI 10.1029/91JC01037 PG 17 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700009 ER PT J AU SMITH, SL LANE, PVZ AF SMITH, SL LANE, PVZ TI THE JET OFF POINT ARENA, CALIFORNIA - ITS ROLE IN ASPECTS OF SECONDARY PRODUCTION IN THE COPEPOD EUCALANUS-CALIFORNICUS JOHNSON SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID CALANUS-PACIFICUS; EGG-PRODUCTION; PHYTOPLANKTON; PERU AB The most abundant large herbivorous copepod in the jet off Point Arena, California, was Eucalanus californicus. In July 1988, females were actively laying eggs and also had a sac of stored lipid. If egg production is a function of present food supply, food concentrations within the jet become the primary factor governing egg laying. However, if stored lipid is the nutritive source for egg production, the critical food supply governing egg laying can be quite distant in space and time from the actual egg laying. In this jet, present food concentration was the factor governing egg production. The size of the lipid sac was also positively correlated with egg production, suggesting that lipid was not being used for oogenesis. Such a life history strategy, in which egg laying and lipid storage are proceeding concurrently in females, has not been described before. Reproductive females were found primarily nearshore and along the southern edge of the jet; highest rates of egg laying and largest lipid reserves were also in these areas. We speculate that temperature affinities of Eucalanus californicus result in maximized abundance, egg production, and lipid sequestration at temperatures below approximately 13-degrees-C. In the Point Arena region, this results in a nearshore portion of the population inhabiting surface layers and showing potential for very high rates of secondary production. The jet acts to transport E. californicus from the nearshore zone into its offshore habitat on a regular basis. Eddies in the region may be the mechanism by which E. californicus is returned to the nearshore zone. RP SMITH, SL (reprint author), BROOKHAVEN NATL LAB,DIV OCEANOG & ATMOSPHER SCI,UPTON,NY 11973, USA. NR 26 TC 38 Z9 38 U1 0 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD AUG 15 PY 1991 VL 96 IS C8 BP 14849 EP 14858 DI 10.1029/91JC00906 PG 10 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700013 ER PT J AU FLETCHER, TD PETROVIC, JJ HACK, JE AF FLETCHER, TD PETROVIC, JJ HACK, JE TI QUANTITATIVE FRACTOGRAPHY OF SIC WHISKER-SI3N4 MATRIX COMPOSITES SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID SI3N4 AB An SEM quantitative stereophotogrammetry technique was developed and employed to analyse the fracture surfaces of VLS SiC whisker-Si3N4 matrix composites. This technique has quantitatively established that increased surface roughness is associated with increased fracture toughness for these composites. Matrix grain morphology and whisker/matrix interfacial characteristics are contributing factors to composite surface roughness. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. YALE UNIV,NEW HAVEN,CT 06520. RP FLETCHER, TD (reprint author), CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106, USA. NR 10 TC 7 Z9 7 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD AUG 15 PY 1991 VL 26 IS 16 BP 4491 EP 4498 DI 10.1007/BF00543672 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA GB979 UT WOS:A1991GB97900039 ER PT J AU SUTTON, M MOCHRIE, SGJ GREYTAK, T NAGLER, SE BERMAN, LE HELD, GA STEPHENSON, GB AF SUTTON, M MOCHRIE, SGJ GREYTAK, T NAGLER, SE BERMAN, LE HELD, GA STEPHENSON, GB TI OBSERVATION OF SPECKLE BY DIFFRACTION WITH COHERENT X-RAYS SO NATURE LA English DT Article AB REFLECTED light from a coherent light source such as a laser shows a graininess known as speckle. In general, a speckle pattern is produced whenever randomly distributed regions of a material introduce different phase shifts into the scattering of coherent incident light. If the arrangement of the regions evolves with time, the speckle pattern will also change. Observation of the intensity fluctuations at a single point in the speckle pattern provides a direct measure of the time correlation function of the inhomogeneity. This leads to a technique 1,2, alternatively called light-beating spectroscopy, dynamic light scattering or intensity fluctuation spectroscopy, which has been widely used with visible light to study processes such as critical fluctuations near phase transitions in fluids and the diffusion of particles in liquids. But it is not possible to study processes involving length scales less than about 200 nm, or those in opaque materials, using visible light. If intensity fluctuation spectroscopy could be carried out using coherent X-rays, however, one could probe the dynamics of processes involving atomic length scales in a wide range of materials. Here we show that by using a high-brilliance X-ray source it should be possible to perform this type of measurement using radiation of wavelength approximately 0.15 nm. Specifically, we have observed a speckle pattern in the diffraction of coherent X-rays from randomly arranged antiphase domains in a single crystal of the binary alloy Cu3Au. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP SUTTON, M (reprint author), MCGILL UNIV,CTR PHYS MAT,DEPT PHYS,MONTREAL H3A 2T8,QUEBEC,CANADA. RI Nagler, Stephen/B-9403-2010; Nagler, Stephen/E-4908-2010 OI Nagler, Stephen/0000-0002-7234-2339 NR 10 TC 237 Z9 238 U1 1 U2 51 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD AUG 15 PY 1991 VL 352 IS 6336 BP 608 EP 610 DI 10.1038/352608a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GB211 UT WOS:A1991GB21100050 ER PT J AU MANE, SR WENG, WT AF MANE, SR WENG, WT TI PARTICLE AMPLITUDE GROWTH DUE TO SINGLE OR REPETITIVE RESONANCE CROSSING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The problem of the amplitude growth of a particle executing a betatron oscillation, caused by crossing a resonance line either once or several times (repetitive resonance crossing), is analyzed from a unified formulation. We assume that the particles in a beam are independent and the motion has one degree of freedom, i.e. it is described by one coordinate-momentum or action-angle pair. Both amplitude-independent tune and amplitude-dependent tune cases are studied for easy comparison and the effects of detuning on amplitude growth have been explicitly presented. Explicit analytic expressions and computer tracking results demonstrating the dependence of the amplitude growth on the parameters governing the motion are presented and the connection with the results of analyses by other authors are discussed. RP MANE, SR (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 7 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 9 EP 20 DI 10.1016/0168-9002(91)90296-3 PG 12 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700002 ER PT J AU LEE, SY RATNER, LG AF LEE, SY RATNER, LG TI FEASIBILITY OF A POLARIZED DEUTERON BEAM IN THE AGS AND RHIC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID SPIN AB The possibility of accelerating polarized deuterons in the AGS and RHIC is discussed. In the AGS, the polarized deuteron can be accelerated up to 15 GeV/c/u without depolarization. In RHIC, the snakes designed for use in accelerating polarized protons are applicable as partial snakes in inducing spin flip to overcome the imperfection resonances. Gradient error resonances in RHIC are found to be negligible. Difficulties arise from intrinsic resonances in RHIC, which limit the polarized deuteron collision energy to gamma less-than-or-equal-to 29 or to an energy less than 27.2 GeV/u, if corrections are not made. A type 3 snake is found to be impractical for a spin tune jump. Betatron tune jump by using quadrupoles or induced betatron oscillations may be used to jump through intrinsic resonances. The achievable luminosity is found to about 2 x 10(30) cm-2 s-1 at gamma almost-equal-to 30. If intrinsic resonances can be overcome, one expects to obtain higher energy and higher luminosity. C1 BROOKHAVEN NATL LAB,DEPT AGS,UPTON,NY 11973. RP LEE, SY (reprint author), INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 15 PY 1991 VL 306 IS 1-2 BP 51 EP 55 DI 10.1016/0168-9002(91)90300-F PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700006 ER PT J AU RAUBENHEIMER, TO AF RAUBENHEIMER, TO TI A NEW TECHNIQUE OF CORRECTING EMITTANCE DILUTIONS IN LINEAR COLLIDERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB This article describes a new method of reducing the transverse emittance dilution in linear colliders due to both transverse wakefields and dispersive errors. The technique is a generalization of the dispersion-free [1] correction algorithm; the dilutions are corrected locally by varying the beam trajectory. This technique will complement the BNS damping [2] method which primarily corrects the dilutions resulting from coherent betatron oscillations. Finally, the results of simulations are presented demonstrating the viability of the technique. RP RAUBENHEIMER, TO (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 9 TC 3 Z9 3 U1 1 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 61 EP 64 DI 10.1016/0168-9002(91)90302-7 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700008 ER PT J AU BUON, J COUCHOT, F JEANJEAN, J LEDIBERDER, F LEPELTIER, V NGOC, HN PEREZYJORBA, J PUZO, P CHEN, P AF BUON, J COUCHOT, F JEANJEAN, J LEDIBERDER, F LEPELTIER, V NGOC, HN PEREZYJORBA, J PUZO, P CHEN, P TI A BEAM SIZE MONITOR FOR THE FINAL FOCUS TEST BEAM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID BREMSSTRAHLUNG AB The beam size monitor, proposed here to be installed at the focus of the FFTB, will be made of a pulsed gas target and an ion detector. The gas is ionized by the beam and the ions are kicked by its space charge field. The time of flight of Ar+ ions up to the detector and the angular distribution of He+ ions will allow one to obtain the two beam transverse dimensions in the range of the FFTB design. C1 UNIV PARIS 11,F-91405 ORSAY,FRANCE. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA. RP BUON, J (reprint author), CNRS,INST NATL PHYS NUCL & PHYS PARTICLES,ACCELERATEUR LINEAIRE LAB,F-91405 ORSAY,FRANCE. NR 26 TC 10 Z9 10 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 93 EP 111 DI 10.1016/0168-9002(91)90307-C PG 19 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700013 ER PT J AU CHAN, CF COOPER, WS KWAN, JW STEELE, WF AF CHAN, CF COOPER, WS KWAN, JW STEELE, WF TI DYNAMICS OF SKEW BEAMS AND THE PROJECTIONAL EMITTANCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Study of the projectional emittance is an efficient way of probing the quality of a particle beam. In this work we deal with some computational aspects of the problem. We present the argument that in a beam optic code for the design or evaluation of the performance of electrostatic extractors/accelerators which produce such (round) beams, one must include in the calculation beamlets with skew angles. This is necessary if one wants to compare calculations with emittance measurements for a beam with transverse temperature. We have developed new steps and modified an existing code for such a purpose and produced calculated results of emittance plots that can be compared with experimental observations. RP CHAN, CF (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 14 TC 5 Z9 5 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 112 EP 122 PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700014 ER PT J AU ADAMS, T DIGIACOMO, NJ EASOM, B GORDON, H GUENTERBERG, G KILLIAN, K KROON, P LAJCZOK, M MARX, M MASON, L POHLEN, J WATT, R WRIGHT, T AF ADAMS, T DIGIACOMO, NJ EASOM, B GORDON, H GUENTERBERG, G KILLIAN, K KROON, P LAJCZOK, M MARX, M MASON, L POHLEN, J WATT, R WRIGHT, T TI AN ENGINEERING DESIGN STUDY OF A HERMETIC LIQUID ARGON CALORIMETER FOR THE SSC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The goal of our study is to evaluate the physics performance of a large liquid argon calorimeter for the SSC engineered to include a realistic support system, cryogenic vessels, signals, and services. The physics performance is dependent on the effect of the dead material on the hermeticity. An integrated design, modeling analysis, and simulation approach is used to allow rapid iteration of the three-dimensional model as well as to provide the ability to trace rays through the design. The results show that a liquid argon calorimeter for the SSC can be designed from a mechanical engineering standpoint and that such a device would achieve excellent physics performance. C1 MARTIN MARIETTA ASTRONAUT,DENVER,CO 80201. SUNY STONY BROOK,STONY BROOK,NY 11794. SUPERCONDUCTING SUPER COLLIDER LAB,DALLAS,TX 75237. RP ADAMS, T (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 15 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 128 EP 138 DI 10.1016/0168-9002(91)90310-M PG 11 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700016 ER PT J AU VACCHI, A CASTOLDI, A CHINNICI, S GATTI, E LONGONI, A PALMA, F SAMPIETRO, M REHAK, P KEMMER, J AF VACCHI, A CASTOLDI, A CHINNICI, S GATTI, E LONGONI, A PALMA, F SAMPIETRO, M REHAK, P KEMMER, J TI PERFORMANCE OF THE UA6 LARGE-AREA SILICON DRIFT CHAMBER PROTOTYPE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID DETECTORS AB This report presents results on the performance of a large-area silicon drift detector (approximately 4 x 4 cm2), which has been designed for use as a high-resolution tracking device in the experiment UA6 at the CERN p-pBAR collider. We give here the basic characteristics of the design, and report the first experimental results. The influence, on the detector's performance, of the adopted design criteria and of the quality of the semiconductors has been experimentally determined and is discussed. Results of the first drift-time calibration using an on-board device for charge injection are also given. C1 POLITECN MILAN,DIPARTIMENTO ELETTRON,I-20133 MILAN,ITALY. BROOKHAVEN NATL LAB,UPTON,NY 11973. TECH UNIV MUNICH,FAC PHYS,W-8000 MUNICH 2,GERMANY. RP VACCHI, A (reprint author), ROCKEFELLER UNIV,NEW YORK,NY 10021, USA. RI Vacchi, Andrea/C-1291-2010; Sampietro, Marco/A-3732-2016 OI Vacchi, Andrea/0000-0003-3855-5856; Sampietro, Marco/0000-0003-4825-9612 NR 13 TC 53 Z9 53 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 187 EP 193 DI 10.1016/0168-9002(91)90318-K PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700024 ER PT J AU GABUTTI, A GRAY, KE PUGH, GM TIBERIO, RC AF GABUTTI, A GRAY, KE PUGH, GM TIBERIO, RC TI IMPROVED BETA DETECTION EFFICIENCY WITH GRANULAR ALUMINUM SUPERCONDUCTING STRIPS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Irradiation of granular aluminum (g-Al) superconducting strips by betas with energies in the minimum-ionizing range has demonstrated a high detection efficiency. An efficiency of almost 70% was found for 0.5-mu-m wide g-Al strips operating at a temperature of 1.4-1.7 K. This is a very encouraging result for this new concept of a high-resolution tracking detector, which could be used in future colliding-beam accelerators such as the proposed Superconducting Super Collider or other large hadron colliders. As was found earlier with X-ray irradiation, the experiments are accurately described by our thermal-propagation model. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. CORNELL UNIV,NATL NANOFABRICAT FACIL,ITHACA,NY 14853. NR 11 TC 5 Z9 5 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 220 EP 224 DI 10.1016/0168-9002(91)90324-J PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700030 ER PT J AU RICHARDSON, JM CHUPP, TE ROBERTSON, RGH WILKERSON, JF AF RICHARDSON, JM CHUPP, TE ROBERTSON, RGH WILKERSON, JF TI A CALORIMETER FOR NEUTRON-FLUX MEASUREMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID LIFETIME AB A calorimeter for absolute neutron flux measurement has been built and tested. The calorimeter measures the heat produced when neutrons are captured via the Li-6(n, H-3)He-4 reaction. The sensitivity achieved was 1.3 X 10(6) n/s for a 1 h measurement. Comparisons with a U-235 fission chamber are in agreement. An improved calorimeter is proposed which is designed to be sensitive to 10(5) n/s for a 1 h measurement. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP RICHARDSON, JM (reprint author), HARVARD UNIV,PHYS LABS,CAMBRIDGE,MA 02138, USA. OI Wilkerson, John/0000-0002-0342-0217 NR 14 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 291 EP 299 DI 10.1016/0168-9002(91)90335-N PG 9 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700041 ER PT J AU FELDMAN, WC AUCHAMPAUGH, GF BYRD, RC AF FELDMAN, WC AUCHAMPAUGH, GF BYRD, RC TI A NOVEL FAST-NEUTRON DETECTOR FOR SPACE APPLICATIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID DEPENDENCE; FLUX AB Laboratory and space tests of a fast-neutron spectrometer that uses a new borated plastic scintillator are described. The sensor is composed of four close-packed rods Of plastic scintillator loaded with 5 mass% of natural boron. Each rod is 7.6 cm in diameter and 20.3 cm long; the total package has a maximum sensitive area of 380 cm2, Weighs 18.2 kg, and draws 10 W. Special features that qualify the detector for many new space and field applications are an inherently rugged design and the capability for: 1) positive neutron identification, 2) high detection efficiency per unit sensor weight; 3) directional resolution; 4) an energy range spanning 0.5 to 20 MeV, 5) moderate energy resolution; 6) long-term operation; and 7) operation under microprocessor control. RP FELDMAN, WC (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MAIL STOP D438,LOS ALAMOS,NM 87545, USA. NR 12 TC 34 Z9 34 U1 1 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 350 EP 365 DI 10.1016/0168-9002(91)90342-N PG 16 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700048 ER PT J AU DELGUERRA, A NELSON, WR RUSSO, P AF DELGUERRA, A NELSON, WR RUSSO, P TI A SIMPLE METHOD TO INTRODUCE K-EDGE SAMPLING FOR COMPOUNDS IN THE CODE EGS4 FOR X-RAY ELEMENT ANALYSIS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB In the standard version of the EGS4 code system, the equivalent K-edge of a compound is assumed to be the weighted average of the K-edge of each element in the compound. This implies that the energy of both the fluorescent photon and the photoelectron is not correct, hence inaccurate EGS4 simulations of energy scoring in the compound material may be produced in the low-energy range (10-100 keV). In this report we show a technique that we used to overcome this problem. The same technique can also be used to introduce L-edge sampling in EGS4. An application of this sampling method to HgI2 compound is shown. C1 STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. IST NAZL FIS NUCL,NAPLES,ITALY. RP DELGUERRA, A (reprint author), UNIV NAPOLI FEDERICO 2,DIPARTIMENTO SCI FIS,PAD 20 MOSTRA DOLTREMARE,I-80125 NAPLES,ITALY. OI Russo, Paolo/0000-0001-9409-0008 NR 7 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 378 EP 385 DI 10.1016/0168-9002(91)90344-P PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700050 ER PT J AU CARR, R AF CARR, R TI ADJUSTABLE PHASE INSERTION DEVICES AS X-RAY SOURCES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID MAGNETS; WIGGLER AB This is a presentation of the design principles for electron storage ring insertion devices whose gap is fixed but in which the rows of magnets move longitudinally with respect to each other. These devices are shown to perform in similar ways to adjustable gap insertion devices presently in use at synchrotron radiation laboratories, but to have significant advantages for new designs. The magnetic field, trajectories of electrons, and spectra of X-rays are calculated, and design considerations are discussed. C1 STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94309. RP CARR, R (reprint author), CEN,DEPT RECH FONDAMENTALE,F-38041 GRENOBLE,FRANCE. NR 16 TC 35 Z9 35 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 AUG 15 PY 1991 VL 306 IS 1-2 BP 391 EP 396 DI 10.1016/0168-9002(91)90346-R PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA GC017 UT WOS:A1991GC01700052 ER PT J AU ZIGLER, A BURKHALTER, PG NAGEL, DJ ROSEN, MD BOYER, K LUK, TS MCPHERSON, A RHODES, CK AF ZIGLER, A BURKHALTER, PG NAGEL, DJ ROSEN, MD BOYER, K LUK, TS MCPHERSON, A RHODES, CK TI PLASMA PRODUCTION FROM ULTRAVIOLET-TRANSMITTING TARGETS USING SUBPICOSECOND ULTRAVIOLET-RADIATION SO OPTICS LETTERS LA English DT Article ID KRF-STAR LASER; WINDOW MATERIALS; ABSORPTION; TEMPERATURE; CALIBRATION; GRADIENTS; CRYSTAL; PULSES AB Plasma produced from ultraviolet-transmitting solid targets undergoing intense (> 10(16) W/cm2) subpicosecond (approximately 600 fs) ultraviolet (248 nm) irradiation have been studied under conditions for which no interfering prepulse plasma is generated. Time and spatially integrated measurements of the x-ray emission for H-like and He-like Mg and Si were found to be consistent with LASNEX calculations that model the laser-target interaction. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV ILLINOIS,CHICAGO,IL 60680. RP ZIGLER, A (reprint author), FM TECHNOL,FAIRFAX,VA 22032, USA. NR 14 TC 18 Z9 18 U1 2 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 1991 VL 16 IS 16 BP 1261 EP 1263 DI 10.1364/OL.16.001261 PG 3 WC Optics SC Optics GA GC117 UT WOS:A1991GC11700015 PM 19776938 ER PT J AU SKINNER, CH AF SKINNER, CH TI HIGH-SENSITIVITY STIMULATED-EMISSION DETECTOR FOR SOFT-X-RAY LASER RESEARCH SO OPTICS LETTERS LA English DT Article ID ND-GLASS LASER; RECOMBINING-PLASMA; GAIN MEASUREMENTS; 18.22 NM; AMPLIFICATION; COLUMN AB A novel, extremely sensitive system for the detection of stimulated emission is proposed. The principle of the detection method relies on the major difference between stimulated and spontaneous emission, its directionality. A unique feature of the system is the use of a separate spontaneous-emission source. The system is predicted to be sensitive to gain-length products, down to 0.1 and below, a capability that would be useful in media in which stimulated emission is weak compared with spontaneous emission. This will have important applications to the development of soft-x-ray lasing in novel systems. RP SKINNER, CH (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 1991 VL 16 IS 16 BP 1266 EP 1268 DI 10.1364/OL.16.001266 PG 3 WC Optics SC Optics GA GC117 UT WOS:A1991GC11700017 PM 19776940 ER PT J AU STEARNS, DG ROSEN, RS VERNON, SP AF STEARNS, DG ROSEN, RS VERNON, SP TI NORMAL-INCIDENCE X-RAY MIRROR FOR 7-NM SO OPTICS LETTERS LA English DT Article ID MULTILAYER STRUCTURES AB Multilayer (ML) structures composed of alternating, ultrathin layers of Ru and B4C have been grown by dc magnetron sputtering. The ML microstructure has been characterized using x-ray diffraction and high-resolution transmission electron microscopy, and the normal-incidence reflectivity has been measured using synchrotron radiation. It is found that, under optimum deposition conditions, the ML structures exhibit smooth and compositionally abrupt interfaces, with a normal-incidence reflectivity as high as 20% at 7.2 nm. The reflectivity decreases when the ML structures are annealed at 500-degrees-C owing to interdiffusion and compound formation at the interfaces. C1 VERNON APPL PHYS,TORRANCE,CA 90505. RP STEARNS, DG (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 10 TC 31 Z9 38 U1 1 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 1991 VL 16 IS 16 BP 1283 EP 1285 DI 10.1364/OL.16.001283 PG 3 WC Optics SC Optics GA GC117 UT WOS:A1991GC11700023 PM 19776946 ER PT J AU KRITSCHA, W SAUERZOPF, FM WEBER, HW CRABTREE, GW CHANG, YC JIANG, PZ AF KRITSCHA, W SAUERZOPF, FM WEBER, HW CRABTREE, GW CHANG, YC JIANG, PZ TI MAGNETIZATION OF BI2SR2CACU2O8 SINGLE-CRYSTALS - FIELD-INDUCED DIAMAGNETISM ABOVE TC, ANISOTROPIC IRREVERSIBILITY LINES, AND REVERSIBLE MIXED STATE PROPERTIES SO PHYSICA C LA English DT Article ID BEAN MODEL; YBA2CU3O7-DELTA; OXIDE; FLOW AB We report on magnetization measurements made on Bi2Sr2CaCu2O8 single crystals with an 8T-SQUID magnetometer. The results confirm the existence of a broad field range with completely reversible characteristics for all temperatures above approximately 15 K and for both field orientations. This is used to determine the penetration depths (lambda-ab(0) = 860 nm, lambda-c(0) = 390 nm) as well as the thermodynamic critical field (mu-0H(c)(0) = 231 mT). Detailed experiments near T(c) showed a large rounding of the transitions, which increased with increasing field and led to the observation of field-induced diamagnetism above T(c). Attempts to evaluate H(c2) in the sense of a mean field theory fail. The irreversibility lines are found to be anisotropic and occur at higher fields and temperatures for H parallel-to a, b. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP KRITSCHA, W (reprint author), UNIV VIENNA,ATOMINST,A-1020 VIENNA,AUSTRIA. NR 27 TC 41 Z9 41 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD AUG 15 PY 1991 VL 179 IS 1-3 BP 59 EP 68 DI 10.1016/0921-4534(91)90011-M PG 10 WC Physics, Applied SC Physics GA GC863 UT WOS:A1991GC86300009 ER PT J AU BAKER, GA JOHNSON, JD AF BAKER, GA JOHNSON, JD TI GENERAL STRUCTURE OF THE THOMAS-FERMI EQUATION OF STATE SO PHYSICAL REVIEW A LA English DT Article AB We derive the behavior of the Thomas-Fermi equation of state near both the "hot-curve" (the limit as T --> infinity for a fixed de Broglie length) and the "cold-curve" (the zero-temperature isotherm) by using perturbation methods. We derive efficient computational formulas for the coefficients in these expansions using Pade methods. We are able to meld all of these results into a structurally correct representation of the Thomas-Fermi fluid pressure. We indicate how this representational structure can be used to construct the equation of state for realistic materials over large ranges of temperature and pressure. We also discuss the computation of the degree of ionization with and without the exchange correction. RP BAKER, GA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 13 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG 15 PY 1991 VL 44 IS 4 BP 2271 EP 2283 DI 10.1103/PhysRevA.44.2271 PG 13 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GC350 UT WOS:A1991GC35000011 ER PT J AU KANG, HC EVANS, JW AF KANG, HC EVANS, JW TI SCALING BEHAVIOR OF DEPOSITION MODELS WITH LIMITED DOWNWARD MOBILITY SO PHYSICAL REVIEW A LA English DT Article ID INTERFACE GROWTH; CONTINUUM EQUATION; EPITAXIAL-GROWTH; 2+1 DIMENSIONS; SURFACE-GROWTH; TRANSITIONS AB We have studied the interface-width scaling behavior of deposition models in which limited downward mobility is introduced. In all the models studied here, there is a maximum allowed slope for the interface at which the growth velocity is zero. The Kardar-Parisi-Zhang equation is resummed in order to show explicitly this slope constraint, but still incorporates parameters lambda-measuring the slope dependence of the growth velocity, nu measuring the surface tension, and D measuring the noise amplitude. Increasing mobility naturally smooths the interface, and is associated with a decrease in the magnitude of lambda-eff = lambda-D1/2/nu-3/2. A detailed study of a bridge-site deposition model, with one hop of probability p, shows that \lambda\ increases with p. From an independent assessment of noise-amplitude behavior, we can conclude that nu must also increase with p to ensure the required lambda-eff behavior. Direct determination of nu via the Wolf-Tang procedure of imposing inhomogeneity on some length scale L supports this conclusion. (However nu depends on the inhomogeneity strength, which should be chosen small, and on L.) We comment on anticipated behavior of similar limited-mobility models in d greater-than-or-equal-to 2 dimensions, and compare with behavior of limited-mobility ballistic deposition and noise-reduced deposition models. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP KANG, HC (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. RI Kang, Hway Chuan/A-3401-2012 NR 29 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG 15 PY 1991 VL 44 IS 4 BP 2335 EP 2344 DI 10.1103/PhysRevA.44.2335 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GC350 UT WOS:A1991GC35000016 ER PT J AU MENDEZMORENO, RM MORENO, M ORTIZ, MA AF MENDEZMORENO, RM MORENO, M ORTIZ, MA TI STABLE CORRUGATED STATE OF THE 2-DIMENSIONAL ELECTRON-GAS SO PHYSICAL REVIEW A LA English DT Article ID ONE-COMPONENT PLASMA; GROUND-STATE; DEFORMABLE JELLIUM; QUANTUM-WELL; 2 DIMENSIONS; SUPERCONDUCTIVITY; APPROXIMATION AB A corrugated and stable ground state is found for the two-dimensional electron gas in both the normal paramagnetic and the fully polarized phases. The self-consistent Hartree-Fock method is used with a modulated set of trial wave functions within the deformable jellium model. The results for high metallic densities reproduce the usual noncorrugated ferromagnetic electron-gas behavior. A transition to a paramagnetic corrugated state for values of r(s) almost-equal-to 6.5 is predicted. At lower densities r(s) almost-equal-to 30, a second transition to a corrugated ferromagnetic phase is suggested. C1 NATL AUTONOMOUS UNIV MEXICO,FAC CIENCIAS,DEPT FIS,MEXICO CITY 04510,DF,MEXICO. UNIV NACL AUTONOMA MEXICO,INST FIS,MEXICO CITY 01000,DF,MEXICO. RP MENDEZMORENO, RM (reprint author), FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 29 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG 15 PY 1991 VL 44 IS 4 BP 2370 EP 2373 DI 10.1103/PhysRevA.44.2370 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GC350 UT WOS:A1991GC35000019 ER PT J AU ONEILL, DM LEWIS, CLS NEELY, D DAVIDSON, SJ ROSE, SJ LEE, RW AF ONEILL, DM LEWIS, CLS NEELY, D DAVIDSON, SJ ROSE, SJ LEE, RW TI CHARACTERIZATION OF A LASER-PRODUCED PLASMA USING THE TECHNIQUE OF POINT-PROJECTION ABSORPTION-SPECTROSCOPY SO PHYSICAL REVIEW A LA English DT Article AB The technique of point-projection spectroscopy has been shown to be applicable to the study of expanding aluminum plasmas generated by approximately 80 ps laser pulses incident on massive, aluminum stripe targets of approximately 125-mu-m width. Targets were irradiated at an intensity of 2.5 +/- 0.5 x 10(13) W/cm2 in a line focus geometry and under conditions similar to those of interest in x-ray laser schemes. Hydrogenic and heliumlike aluminum resonance lines were observed in absorption using a quasicontinuous uranium back-lighter plasma. Using a pentaerythrital Bragg crystal as the dispersive element, a resolving power of approximately 3500 was achieved with spatial resolution at the 5-mu-m level in frame times of the order of 100 ps. Reduction of the data for times up to 150 ps after the peak of the incident laser pulse produced estimates of the temperature and ion densities present, as a function of space and time. The one-dimensional Lagrangian hydrodynamic code MEDUSA coupled to the atomic physics non-local-thermodynamic-equilibrium ionized material package was used to simulate the experiment in planar geometry and has been shown to be consistent with the measurements. C1 RUTHERFORD APPLETON LAB,DIV LASER,DIDCOT OX11 0QX,OXON,ENGLAND. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP ONEILL, DM (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 15 TC 28 Z9 29 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 AUG 15 PY 1991 VL 44 IS 4 BP 2641 EP 2648 DI 10.1103/PhysRevA.44.2641 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GC350 UT WOS:A1991GC35000047 ER PT J AU SAXENA, A BISHOP, AR AF SAXENA, A BISHOP, AR TI MULTIPOLARON SOLUTIONS OF THE GROSS-NEVEU FIELD-THEORY - TODA POTENTIAL AND DOPED POLYMERS SO PHYSICAL REVIEW A LA English DT Note ID CONJUGATED DIATOMIC POLYMER; SEMICLASSICAL BOUND-STATES; INFINITE POLYYNE CHAIN; PERIODIC-SOLUTIONS; CONTINUUM MODEL; POLYACETYLENE; SOLITONS; EXCITATIONS; SYMMETRY; SYSTEMS AB Exact, periodic multipolaron solutions are constructed for the Gross-Neveu (GN) field theory in one dimension for particles with N flavors. First we connect the appropriate GN equations with continuum models of Peierls distorted polymer chains. Then we utilize a relationship between the cnoidal wave solutions of the Toda lattice and the potential of a polaron lattice in polymers. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP SAXENA, A (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 33 TC 18 Z9 18 U1 0 U2 2 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 AUG 15 PY 1991 VL 44 IS 4 BP R2251 EP R2254 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GC350 UT WOS:A1991GC35000007 ER PT J AU CHEN, AL YU, PY PASTERNAK, MP AF CHEN, AL YU, PY PASTERNAK, MP TI METALLIZATION AND AMORPHIZATION OF THE MOLECULAR-CRYSTALS SNI4 AND GEI4 UNDER PRESSURE SO PHYSICAL REVIEW B LA English DT Article ID AMORPHOUS STATE; TRANSITION; SCATTERING AB The insulator-to-metal transition in SnI4 and GeI4 was studied as a function of pressure up to 25 GPA by measuring the temperature dependence of the sample resistance inside a diamond-anvil cell. Both materials were found to metallize at well-defined pressures. A model proposed by Pasternak and Taylor in which the tetrahedral iodide molecules are linked to form conducting chains was found to explain both the metallization and amorphization of these molecular crystals. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CHEN, AL (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 16 TC 27 Z9 28 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 2883 EP 2886 DI 10.1103/PhysRevB.44.2883 PG 4 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600001 ER PT J AU FREERICKS, JK FALICOV, LM AF FREERICKS, JK FALICOV, LM TI HIDDEN SYMMETRIES OF FINITE-SIZE CLUSTERS WITH PERIODIC BOUNDARY-CONDITIONS SO PHYSICAL REVIEW B LA English DT Article ID HEAVY-FERMION SYSTEM; HUBBARD-MODEL; HEISENBERG-MODEL AB Finite-size clusters with periodic boundary conditions resemble isolated clusters for a small number of sites, and infinite lattices for a large number of sites. The transition from a self-contained system to an infinite lattice passes through an intermediate region with increased (hidden) symmetry. In this high-symmetry region irreducible representations of the space group may stick together to form higher-dimensional representations of the complete symmetry group. This transition is examined for a class of simple-, body-centered-, and face-centered-cubic lattice clusters and the two-dimensional square lattice cluster. The implications of an enlarged symmetry group are also studied for a model of strongly correlated electrons interacting on eight-site clusters. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP FREERICKS, JK (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Freericks, James/D-7502-2011; OI Freericks, James/0000-0002-6232-9165 NR 22 TC 5 Z9 5 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 2895 EP 2904 DI 10.1103/PhysRevB.44.2895 PG 10 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600003 ER PT J AU LEUNG, TC CHAN, CT HARMON, BN AF LEUNG, TC CHAN, CT HARMON, BN TI GROUND-STATE PROPERTIES OF FE, CO, NI, AND THEIR MONOXIDES - RESULTS OF THE GENERALIZED GRADIENT APPROXIMATION SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL MONOXIDES; DENSITY-FUNCTIONAL FORMALISM; ELECTRONIC-STRUCTURE; CORRELATION-ENERGY; EXCHANGE-ENERGY; BAND; SUPERCONDUCTORS; GAS AB The lattice parameter, bulk modulus, cohesive energy, and magnetization of Fe, Co, and Ni are calculated using the generalized gradient approximation (GGA) of Perdew and co-workers. The GGA results agree better with experimental data than the corresponding results calculated with the local-spin-density approximation (LSDA). In particular, the overestimation of the cohesive energies are reduced and the GGA correctly predicts the bcc ferromagnetic phase to be the ground state of Fe, while the LSDA fails to do so. We have also studied the electronic and magnetic properties of the insulating antiferromagnetic transition-metal compounds FeO, CoO, and NiO with the GGA. For these oxides it is found that the results are very similar to the results calculated with use of the LSDA. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP LEUNG, TC (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 34 TC 173 Z9 175 U1 1 U2 19 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 2923 EP 2927 DI 10.1103/PhysRevB.44.2923 PG 5 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600007 ER PT J AU OLBRIGHT, GR FU, WS KLEM, JF GIBBS, HM KHITROVA, G PON, R FLUEGEL, B MEISSNER, K PEYGHAMBARIAN, N BINDER, R GALBRAITH, I KOCH, SW AF OLBRIGHT, GR FU, WS KLEM, JF GIBBS, HM KHITROVA, G PON, R FLUEGEL, B MEISSNER, K PEYGHAMBARIAN, N BINDER, R GALBRAITH, I KOCH, SW TI NONLINEAR OPTICAL-PROPERTIES OF TYPE-II QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID GAAS-ALAS SUPERLATTICES; GAAS/ALAS SUPERLATTICES; ELECTRIC-FIELD; SEMICONDUCTORS; THICKNESS AB Experimental and theoretical investigations of the near-band-gap optical nonlinearities in type-II GaAs/AlAs quantum wells are reported. The temporal evolution of the optical nonlinearities of different samples grown at our two different laboratories is analyzed by comparing femtosecond results at different pump-probe time delays with nanosecond measurements at different sample temperatures. The quasi-cw measurements at low temperatures show exciton bleaching and a pronounced heavy-hole exciton blueshift, which is absent at elevated plasma temperatures (congruent-to 100 K). Femtosecond spectra show a delayed onset of the exciton blueshift consistent with hole-plasma cooling in the absence of electrons. The results are analyzed using many-body theory assuming complete electron-hole charge separation. We show that the presence of a one-component plasma modifies the nonlinear optical behavior of the GaAs layer and results in dramatically different properties compared to type-I quantum-well structures. C1 STANFORD UNIV,SOLID STATE ELECTR LAB,STANFORD,CA 94305. UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. RP OLBRIGHT, GR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. OI Galbraith, Ian/0000-0002-0547-7567 NR 29 TC 22 Z9 22 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 3043 EP 3053 DI 10.1103/PhysRevB.44.3043 PG 11 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600022 ER PT J AU MAHAN, GD OLIVEIRA, LE AF MAHAN, GD OLIVEIRA, LE TI QUASI-FERMI-LEVELS IN QUANTUM-WELL PHOTOLUMINESCENCE SO PHYSICAL REVIEW B LA English DT Article ID EXTRINSIC PHOTO-LUMINESCENCE; HYDROGENIC IMPURITY STATES; OPTICAL-ABSORPTION; ENERGY-SPECTRA; GAAS; ACCEPTORS; DONORS; RECOMBINATION; INTERFACE AB The nonequilibrium quasi-Fermi-levels of electrons and holes in quantum wells are calculated during photoluminescence. It is assumed the electrons and holes are created by continuous laser excitation. Various recombination processes are included: electron radiative recombination with holes bound at neutral acceptors, electron radiative recombination with free holes, hole trapping at ionized acceptors, and Auger decay. A numerical example is presented for acceptors in GaAs/Ga(1-x)Al(x)As quantum wells. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV ESTADUAL CAMPINAS,INST FIS,BR-13081 CAMPINAS,SP,BRAZIL. RP MAHAN, GD (reprint author), UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996, USA. RI Inst. of Physics, Gleb Wataghin/A-9780-2017 NR 28 TC 15 Z9 15 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 3150 EP 3156 DI 10.1103/PhysRevB.44.3150 PG 7 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600035 ER PT J AU MOUDDEN, AH ELMIGER, M SHAPIRO, SM COLLINS, BT GREENBLATT, M AF MOUDDEN, AH ELMIGER, M SHAPIRO, SM COLLINS, BT GREENBLATT, M TI NEUTRON-SCATTERING INVESTIGATION OF THE CHARGE-DENSITY WAVE IN TL0.3MOO3 SO PHYSICAL REVIEW B LA English DT Note ID BLUE BRONZE; MOLYBDENUM BRONZES; PEIERLS TRANSITION; X-RAY; K0.3MOO3; K0.30MOO3; GROWTH AB Elastic-neutron-scattering experiments, performed on a single crystal of Tl0.3MoO3, show the formation of a periodic distortion below the metal-semiconductor transition at about 170 K. Similar to the isostructural blue bronzes K0.3MoO3 and Rb0.3MoO3, this periodic distortion is characterized by a temperature-dependent wave vector q = (0,q(b)(T),0.5) referring to the high-temperature space group C2/m. The incommensurate component q(b)(T) decreases continuously from 0.267 at the transition temperature to 0.253 at about 100 K, below which it remains constant down to 10 K. Unlike the K and Rb analogs for which there is still some debate on whether there is a commensurate-incommensurate transition at 100 K, the Tl blue bronze is clearly incommensurate down to low temperatures. While the magnetic susceptibility shows a substantial anomaly around 50 K, detailed neutron-scattering studies in this temperature region reveal no significant effect on the charge-density wave. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RUTGERS STATE UNIV,DEPT CHEM,NEW BRUNSWICK,NJ 08903. RP MOUDDEN, AH (reprint author), CENS,LAB LEON BRILLOUIN,F-91191 GIF SUR YVETTE,FRANCE. NR 19 TC 6 Z9 6 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 3324 EP 3327 DI 10.1103/PhysRevB.44.3324 PG 4 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600058 ER PT J AU LU, ZW WEI, SH ZUNGER, A AF LU, ZW WEI, SH ZUNGER, A TI LARGE LATTICE-RELAXATION-INDUCED ELECTRONIC LEVEL SHIFTS IN RANDOM CU1-XPDX ALLOYS SO PHYSICAL REVIEW B LA English DT Note ID SPECIAL QUASIRANDOM STRUCTURES; METAL-ALLOYS; CU; STATES; PD; DENSITY; IMPURITIES; BAND; APPROXIMATION; SPECTRA AB Mean-field theories of unrelaxed Cu0.75Pd0.25 alloys exhibit a deep (epsilon-F - 5.5 eV) Pd bonding state at the bottom of the Cu d band that does not show up in photoemission experiments. We have applied the "special quasirandom structures" construct to Cu(1-x)Pd(x) alloys in the context of local-density total-energy minimization, finding a distribution of Cu-Cu, Cu-Pd, and Pd-Pd bonds whose lengths deviate significantly from the single, unrelaxed value assumed in mean-field models. Such lattice distortions are found to induce a approximately 1-eV shift in the Pd bonding state to lower binding energies, thus removing much of the discrepancy with experiment. RP LU, ZW (reprint author), SOLAR ENERGY RES INST,GOLDEN,CO 80401, USA. NR 32 TC 48 Z9 48 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 3387 EP 3390 DI 10.1103/PhysRevB.44.3387 PG 4 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600075 ER PT J AU BISWAS, R KWON, I SOUKOULIS, CM AF BISWAS, R KWON, I SOUKOULIS, CM TI MECHANISM FOR THE STAEBLER-WRONSKI EFFECT IN A-SI-H SO PHYSICAL REVIEW B LA English DT Note ID HYDROGENATED AMORPHOUS-SILICON; METASTABLE DEFECTS; GENERATION; DYNAMICS AB A mechanism is proposed for the Staebler-Wronski effect in a-Si:H. A bridge-bonded H interstitial defect is identified as the annealed state that can form a higher-energy metastable dangling-bond state in the light-soaked state. This defect can account for various features of light-induced degradation. The calculations are based on an a-Si:H model containing 10% hydrogen, bonded as the monohydride species. A Si-H two- and three-body interatomic potential has also been developed for the simulations. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP BISWAS, R (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,MICROELECTR RES CTR,AMES,IA 50011, USA. RI Soukoulis, Costas/A-5295-2008 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 3403 EP 3406 DI 10.1103/PhysRevB.44.3403 PG 4 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600079 ER PT J AU WOICIK, JC KENDELEWICZ, T MIYANO, KE COWAN, PL BOULDIN, CE KARLIN, BA PIANETTA, P SPICER, WE AF WOICIK, JC KENDELEWICZ, T MIYANO, KE COWAN, PL BOULDIN, CE KARLIN, BA PIANETTA, P SPICER, WE TI DETERMINATION OF THE SB/SI(111) INTERFACIAL STRUCTURE BY BACK-REFLECTION X-RAY STANDING WAVES AND SURFACE EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE SO PHYSICAL REVIEW B LA English DT Note AB Based on the surface extended x-ray-absorption fine-structure (SEXAFS) absolute surface coordination numbers, Woicik el al. [Phys. Rev. B 43, 4331 (1991)] argued that Sb trimers adsorb on the Si(111) surface in a modified "bridge" configuration rotated by 60-degrees relative to the atop "milk stool" geometry proposed by Abukawa, Park, and Kono (Surf. Sci. Lett. 201, 513 (1988)). Using the accurate near-neighbor bond lengths as determined from SEXAFS, these models predict perpendicular distances of 1.76 and 2.60 angstrom between the top Si atoms and the Sb layer, respectively. New back-reflection x-ray standing-wave data find the Sb atoms to reside 2.53 +/- 0.1 angstrom above the Si surface, in clear support of the milk stool geometry. Polarization-dependent SEXAFS relative coordination numbers support the milk stool model as well. C1 STANFORD UNIV,STANFORD ELECTR LAB,STANFORD,CA 94305. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP WOICIK, JC (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 13 TC 35 Z9 35 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 3475 EP 3478 DI 10.1103/PhysRevB.44.3475 PG 4 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600098 ER PT J AU CREAGER, WN RICHARDS, PL ZETTL, A AF CREAGER, WN RICHARDS, PL ZETTL, A TI FAR-INFRARED CONDUCTIVITY OF TAS3 - THE INTRINSIC CHARGE-DENSITY-WAVE EXCITATION MODES SO PHYSICAL REVIEW B LA English DT Article ID LATTICE-VIBRATIONS; INERTIAL DYNAMICS; PHASE-TRANSITIONS; (TASE4)2I; RELAXATION; (NBSE4)2I; GAP AB The far-infrared (FIR) reflectance of the charge-density-wave (CDW) conductor TaS3 has been measured from 3 to 700 cm-1, over the temperature range from 15 to 300 K. For incident radiation polarized parallel to the long axis of the crystals, a strong reflection edge correlated with the formation of the CDW appears near 80 cm-1. The associated conductivity shows the pinned acoustic phason near 0.5 cm-1 dominating-epsilon(omega) and an additional small mode near 9 cm-1. The size of the latter mode is in sharp contrast to that observed in the related CDW materials (TaSe4)2I and K0.3MoO3. These results rule out current models of a "generic FIR mode" in CDW excitations. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP CREAGER, WN (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 18 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 8 BP 3505 EP 3508 DI 10.1103/PhysRevB.44.3505 PG 4 WC Physics, Condensed Matter SC Physics GA GC995 UT WOS:A1991GC99500001 ER PT J AU SHEN, ZX LIST, RS DESSAU, DS WELLS, BO JEPSEN, O ARKO, AJ BARTTLET, R SHIH, CK PARMIGIANI, F HUANG, JC LINDBERG, PAP AF SHEN, ZX LIST, RS DESSAU, DS WELLS, BO JEPSEN, O ARKO, AJ BARTTLET, R SHIH, CK PARMIGIANI, F HUANG, JC LINDBERG, PAP TI ELECTRONIC-STRUCTURE OF NIO - CORRELATION AND BAND EFFECTS SO PHYSICAL REVIEW B LA English DT Article ID ANGLE-RESOLVED PHOTOEMISSION; TRANSITION-METAL MONOXIDES; MOTT INSULATORS; AUGER-SPECTRA; X-RAY; COO; SUPERCONDUCTORS; COPPER; MNO; PHOTOELECTRON AB We have performed angle-resolved-photoemission experiments and local-density-functional (LDA) band calculations on NiO to study correlation and band effects of this conceptually important compound. Our experimental result suggests a dual nature of the electronic structure of NiO. On the one hand, the LDA band calculation has some relevance to the electronic structure of NiO, and the inclusion of the antiferromagnetic order is essential. For the lower O 2p bands, the LDA calculation agrees almost perfectly with experimental energy positions and dispersion relations. On the other hand, discrepancies between the experiment and the LDA calculation do exist, especially for the Ni 3d bands and the O 2p bands that are heavily mixed with the Ni 3d bands. It appears that the main discrepancies between the experimental results and the LDA calculation are concentrated in the regions of the insulating gap and the valence-band satellite. In addition to these results, we also report the interesting angle and photon-energy dependence of the satellite emission. The above results show that the angle-resolved-photoemission studies can provide much additional information about the electronic structure of correlated materials like NiO. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. MAX PLANCK INST SOLID STATE RES,W-7000 STUTTGART 80,GERMANY. UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712. IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120. RP SHEN, ZX (reprint author), STANFORD UNIV,STANFORD ELECTR LABS,STANFORD,CA 94305, USA. OI Parmigiani, Fulvio/0000-0001-9529-7406 NR 65 TC 117 Z9 118 U1 2 U2 22 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 8 BP 3604 EP 3626 DI 10.1103/PhysRevB.44.3604 PG 23 WC Physics, Condensed Matter SC Physics GA GC995 UT WOS:A1991GC99500011 ER PT J AU GLAZMAN, LI JONSON, M AF GLAZMAN, LI JONSON, M TI BREAKDOWN OF CONDUCTANCE QUANTIZATION AND MESOSCOPIC FLUCTUATIONS IN THE QUASI-BALLISTIC REGIME SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONAL ELECTRON-GAS; BALLISTIC-RESISTANCE; POINT CONTACTS; SCATTERING; SUPPRESSION; QUANTUM; CONSTRICTIONS; OSCILLATIONS; TRANSPORT; WIRE AB We present an analytical theory of corrections to the quantum ballistic conductance of a channel formed in a two-dimensional electron gas (2D EG). Backscattering that causes the corrections occurs inside the channel and is due to a random potential produced by charged donors. The spatial separation of the donors from the 2D EG implies that the scattering potential is smooth and hence gives a natural scale for the width of the channel. We derive the necessary conditions for conductance quantization in both cases of narrow and wide channels. These conditions determine how many quantized steps of the conductance can be observed at a given channel length. An analysis based on our results shows that in existing experiments breakdown of the conductance quantization and a crossover to mesoscopic fluctuations occurs in the narrow-channel limit. The dominating mechanism of breakdown is backscattering within the propagating mode with the largest mode number. This conclusion is validated by a comparison with experimental data. We determine the amplitude of mesoscopic conductance fluctuations in the ballistic regime and derive the minimum temperature for which they are smeared out. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. CHALMERS UNIV TECHNOL,INST PHYS,S-41296 GOTHENBURG,SWEDEN. RP GLAZMAN, LI (reprint author), UNIV MINNESOTA,SCH PHYS & ASTRON,INST THEORET PHYS,116 CHURCH ST SE,MINNEAPOLIS,MN 55455, USA. RI Jonson, Mats/D-6545-2011 NR 21 TC 29 Z9 29 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 AUG 15 PY 1991 VL 44 IS 8 BP 3810 EP 3820 DI 10.1103/PhysRevB.44.3810 PG 11 WC Physics, Condensed Matter SC Physics GA GC995 UT WOS:A1991GC99500031 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI PULAY-TYPE FORMULA FOR SURFACE STRESS IN A LOCAL-DENSITY-FUNCTIONAL, LINEAR COMBINATION OF ATOMIC ORBITALS, ELECTRONIC-STRUCTURE CALCULATION SO PHYSICAL REVIEW B LA English DT Article ID TOTAL-ENERGY; ADSORBATE; DIFFUSION; METAL; FORCE AB A formula for surface stress is derived, for self-consistent linear combination of atomic orbitals calculations of surface electronic structure. The formula yields the exact strain derivative of the energy for any choice of localized-orbital basis. RP SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 23 TC 23 Z9 23 U1 0 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 8 BP 3916 EP 3925 DI 10.1103/PhysRevB.44.3916 PG 10 WC Physics, Condensed Matter SC Physics GA GC995 UT WOS:A1991GC99500044 ER PT J AU GUMBSCH, P DAW, MS AF GUMBSCH, P DAW, MS TI INTERFACE STRESSES AND THEIR EFFECTS ON THE ELASTIC-MODULI OF METALLIC MULTILAYERS SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; SURFACE STRESS; NOBLE-METALS; THIN-FILMS; FOILS; NICKEL; ALLOYS; GOLD; SUPERLATTICES; PALLADIUM AB The embedded-atom method is used to calculate the surface stresses and the interface stresses for several fcc metals and interfaces between them. While the surface stresses are all positive (i.e., they tend to put the underlying crystal in compression), in several instances (e.g., in the Pt/Ni system) negative interface stresses are found. The effects of the interface stresses on the elastic moduli of metallic multilayers are discussed. C1 SANDIA NATL LABS,LIVERMORE,CA 94551. RP GUMBSCH, P (reprint author), MAX PLANCK INST MET RES,INST WERKSTOFFWISSENSCH,W-7000 STUTTGART,GERMANY. RI Gumbsch, Peter/E-5879-2012 OI Gumbsch, Peter/0000-0001-7995-228X NR 20 TC 114 Z9 115 U1 0 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 AUG 15 PY 1991 VL 44 IS 8 BP 3934 EP 3938 DI 10.1103/PhysRevB.44.3934 PG 5 WC Physics, Condensed Matter SC Physics GA GC995 UT WOS:A1991GC99500046 ER PT J AU SASAKI, M YOKOYAMA, J AF SASAKI, M YOKOYAMA, J TI INITIAL CONDITION FOR THE MINIMAL ISOCURVATURE SCENARIO SO PHYSICAL REVIEW D LA English DT Article ID COLD DARK MATTER; LARGE-SCALE STRUCTURE; POWER-LAW INFLATION; PRIMORDIAL NUCLEOSYNTHESIS; PHASE-TRANSITION; UNIVERSE; FLUCTUATIONS; PERTURBATIONS; COSMOLOGY; DENSITY AB We derive a proper expression for the power spectrum of baryon-number fluctuations arising from decay of a heavy Majorana lepton with space-dependent CP violation due to a spatially varying Majoron field. The spectrum is explicitly calculated in a power-law inflation model and found to be almost scale invariant on small scales and white noise on large scales. Under reasonable assumptions, we present a natural particle-physics model which provides an appropriate initial condition for the minimal isocurvature scenario of large-scale structure formation. C1 UNIV TOKYO,FAC SCI,DEPT PHYS,TOKYO 113,JAPAN. FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. RP SASAKI, M (reprint author), KYOTO UNIV,UJI RES CTR,YUKAWA INST THEORET PHYS,UJI,KYOTO 611,JAPAN. OI Sasaki, Misao/0000-0001-5924-0664 NR 57 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 15 PY 1991 VL 44 IS 4 BP 970 EP 979 DI 10.1103/PhysRevD.44.970 PG 10 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GB377 UT WOS:A1991GB37700007 ER PT J AU BURKARDT, M LANGNAU, A AF BURKARDT, M LANGNAU, A TI HAMILTONIAN-FORMULATION OF (2 + 1)-DIMENSIONAL QED ON THE LIGHT-CONE SO PHYSICAL REVIEW D LA English DT Article ID INFINITE-MOMENTUM FRAME; NULL-PLANE; QUANTIZATION AB It is shown that an improper regularization in the light-cone quantization of field theories can introduce a violation of rotational invariance as well as spurious divergences. Several methods are developed to avoid or cure these problems, as required for a consistent renormalization procedure of gauge theories. Based on these methods, the light-cone Hamiltonian for (2 + 1)-dimensional QED is constructed. Extension to gauge theories in 3 + 1 physical dimensions is also discussed. RP BURKARDT, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305, USA. NR 22 TC 39 Z9 41 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 AUG 15 PY 1991 VL 44 IS 4 BP 1187 EP 1197 DI 10.1103/PhysRevD.44.1187 PG 11 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GB377 UT WOS:A1991GB37700028 ER PT J AU BRAATEN, E THOMA, MH AF BRAATEN, E THOMA, MH TI ENERGY-LOSS OF A HEAVY FERMION IN A HOT QED PLASMA SO PHYSICAL REVIEW D LA English DT Article ID HARD THERMAL LOOPS; QUARK-GLUON PLASMA; FINITE-TEMPERATURE; WARD IDENTITIES; GAUGE-THEORIES; DAMPING RATE; QCD; SCATTERING; AMPLITUDES; TRANSPORT AB The energy loss dE/dx for a heavy lepton propagating through a high-temperature QED plasma is calculated to leading order in the QED coupling constant. The screening effects of the plasma are computed consistently using a resummation of perturbation theory in the small-momentum-transfer region. At large momentum transfer, recoil effects are properly taken into account. Our complete leading-order calculation differs significantly from previous calculations. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP BRAATEN, E (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 25 TC 189 Z9 188 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 AUG 15 PY 1991 VL 44 IS 4 BP 1298 EP 1310 DI 10.1103/PhysRevD.44.1298 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GB377 UT WOS:A1991GB37700041 ER PT J AU ROULET, E AF ROULET, E TI MIKHEYEV-SMIRNOV-WOLFENSTEIN EFFECT WITH FLAVOR-CHANGING NEUTRINO INTERACTIONS SO PHYSICAL REVIEW D LA English DT Note ID R-PARITY; STANDARD MODEL; OSCILLATIONS; SUPERSYMMETRY; MATTER; ENHANCEMENT; PHYSICS AB We consider the effect that flavor-nondiagonal neutrino interactions with matter have on the resonant v oscillations. It is shown that, even in the absence of v mixing in a vacuum, an efficient conversion of the electron neutrinos from the Sun to another v flavor can result if the strength of this interaction is approximately 10(-2)G(F). We show how this can be implemented in the minimal supersymmetric standard model with R-parity breaking. Here, the L-violating couplings induce neutrino masses, mixings, and the flavor-nondiagonal neutrino interactions that can provide a Mikheyev-Smirnov-Wolfenstein-like solution to the solar-neutrino problem even for negligible vacuum mixings. RP ROULET, E (reprint author), FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,POB 500,BATAVIA,IL 60510, USA. NR 25 TC 101 Z9 101 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 AUG 15 PY 1991 VL 44 IS 4 BP R935 EP R938 DI 10.1103/PhysRevD.44.R935 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GB377 UT WOS:A1991GB37700001 ER PT J AU OLIVE, KA SCHRAMM, DN THOMAS, D WALKER, TP AF OLIVE, KA SCHRAMM, DN THOMAS, D WALKER, TP TI NEUTRINO DEGENERACY AND COSMOLOGICAL NUCLEOSYNTHESIS, REVISITED SO PHYSICS LETTERS B LA English DT Article ID BIG-BANG NUCLEOSYNTHESIS; PRIMORDIAL NUCLEOSYNTHESIS; LEPTON; ASYMMETRY; UNIVERSE; RATES AB A reexamination of the effects of non-zero neutrino degeneracies on big bang nucleosynthesis is made. As previously noted, non-trivial alterations of the standard model conclusions can only be induced if excess lepton numbers L(i), comparable to photon number densities n-gamma, are assumed (where n-gamma approximately 3 x 10(9)n(b)). Furthermore, the required lepton number densities (L(i)n-gamma) must be different for nu-e than for nu-mu and nu-tau. It is shown that this loophole in the standard model of nucleosynthesis is robust and will not vanish as abundance and reaction rate determinations improve. However, it is also argued that theoretically \L(e)\ approximately \L-mu\ approximately \L-tau\ approximately n(b) << n-gamma which would preclude this loophole in standard unified models. C1 UNIV CHICAGO,CHICAGO,IL 60637. NASA,FERMI NATL ACCELERATOR LAB,FERMILAB ASTROPHYS GRP,BATAVIA,IL 60510. OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210. RP OLIVE, KA (reprint author), UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455, USA. NR 24 TC 50 Z9 50 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 AUG 15 PY 1991 VL 265 IS 3-4 BP 239 EP 244 DI 10.1016/0370-2693(91)90048-U PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GD837 UT WOS:A1991GD83700008 ER PT J AU LHUILLIER, A SCHAFER, KJ KULANDER, KC AF LHUILLIER, A SCHAFER, KJ KULANDER, KC TI THEORETICAL ASPECTS OF INTENSE FIELD HARMONIC-GENERATION SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Review ID RARE-GASES; 3RD-HARMONIC GENERATION; MULTIPHOTON IONIZATION; LASER-RADIATION; FREQUENCY-CONVERSION; COHERENT RADIATION; ULTRAVIOLET-RADIATION; PERTURBATION-THEORY; VACUUM ULTRAVIOLET; 1064-NM RADIATION AB We present theoretical studies of high-order harmonic generation in a rare-gas medium. The experimental results obtained at Saclay with a 1064 nm Nd-YAG laser in the 10(13) W cm-2 intensity range are summarized. The harmonic emission strengths first decrease rather steeply for the first orders, then form a long plateau up to the 21st harmonic in xenon, or up to the 33rd harmonic in argon, before decreasing again rather abruptly. The theoretical description of these experiments consists first in the calculation of the photo-emission spectra emitted by a single atom. The spectra are obtained by numerically integrating a time-dependent Schrodinger equation for the laser-excited rare-gas atom. Second, one must account for collective effects in the medium, described by Maxwell's equations. A theoretical framework for describing the generation and propagation of harmonics in strong laser fields is developed. A numerical solution of the propagation equations for the harmonic fields in xenon at 1064 nm provides results which agree well with experimental data. We discuss the role of phase matching in the high-order harmonic generation experiments. The main conclusion is that phase matching is determined not only by the variation of the phases of the interfering fields in the non-linear medium, but also by the variation of the amplitudes throughout the medium. We find orders of magnitude improvement in phase matching in a strong-field regime compared with the perturbative limit. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, LIVERMORE, CA 94550 USA. RP LHUILLIER, A (reprint author), CENS, DRECAM, SERV PHOTONS ATOMES & MOLECULES, BATIMENT 522, F-91191 GIF SUR YVETTE, FRANCE. RI L'Huillier, Anne/P-4379-2015 OI L'Huillier, Anne/0000-0002-1335-4022 NR 72 TC 261 Z9 262 U1 2 U2 46 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD AUG 14 PY 1991 VL 24 IS 15 BP 3315 EP 3341 DI 10.1088/0953-4075/24/15/004 PG 27 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GB596 UT WOS:A1991GB59600004 ER PT J AU HARTWIG, JF ANDERSEN, RA BERGMAN, RG AF HARTWIG, JF ANDERSEN, RA BERGMAN, RG TI INTERMOLECULAR AND INTRAMOLECULAR C-H BOND FORMING AND CLEAVAGE REACTIVITY OF 2 DIFFERENT TYPES OF POLY(TRIMETHYLPHOSPHINE)RUTHENIUM INTERMEDIATES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID CARBON-HYDROGEN-BONDS; REDUCTIVE-ELIMINATION REACTION; METAL-COMPLEXES; SATURATED-HYDROCARBONS; TETRAKIS(TRIMETHYLPHOSPHINE)OSMIUM(II) SYSTEM; PHOTOCHEMICAL CARBONYLATION; ORGANOMETALLIC CHEMISTRY; OXIDATIVE ADDITION; RHODIUM COMPLEX; ACTIVATION AB The products and mechanisms of the thermal reactions of several complexes of the general structure (PMe3)4Ru(X)(H), where X is an aryl or benzyl group, have been investigated. The mechanism of decomposition depends critically on the structure of the complex and the medium in which the thermolysis is carried out. For example, thermolysis of the benzyl hydride complex (PMe3)4Ru(CH2Ph)(H) (1) leads to reductive elimination of toluene directly from the 18-electron complex and yields the intermediate (PMe3)4Ru which undergoes intramolecular oxidative addition of a phosphine C-H bond. Heating the phenyl hydride complex (PMe3)4Ru(Ph)(H) (5) in cyclohexane also leads to reductive elimination to form (PMe3)4Ru. In contrast, allowing 5 to decompose in arene solvents leads to exchange of the arene ring by an intermolecular C-H activation mechanism involving the intermediate (PMe3)3Ru(Ph)(H) formed by rapid, reversible phosphine dissociation. Thermolysis of (PMe3)4Ru(H)2 does not result in the formation of H-2 and (PMe3)4Ru, but instead it undergoes only H/D exchange with C6D6 solvent via the intermediate (PMe3)3Ru(H)2. Thus, the intermediate (PMe3)4Ru gives rise to products resulting from intramolecular C-H activation, whereas (PMe3)3Ru(Ph)(H) and (PMe3)3Ru(H)2 lead only to products resulting from intermolecular C-H activation. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 66 TC 37 Z9 37 U1 0 U2 9 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 AUG 14 PY 1991 VL 113 IS 17 BP 6492 EP 6498 DI 10.1021/ja00017a021 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA GB298 UT WOS:A1991GB29800021 ER PT J AU FRITZ, IJ KLEM, JF WENDT, JR AF FRITZ, IJ KLEM, JF WENDT, JR TI REFLECTANCE MODULATOR BASED ON TANDEM FABRY-PEROT RESONATORS SO APPLIED PHYSICS LETTERS LA English DT Article ID GAAS; ALAS AB We present calculations and data on a novel, electrically tunable reflector structure consisting of tandem Fabry-Perot resonators grown as a single epitaxial device. The device consists of three mirrors (quarter-wave stacks of AlGaAs and AlAs) separated by two cavities (one an AlGaAs alloy and the other a GaAs/AlGaAs superlattice) on a GaAs substrate. The tandem cavities produce a characteristic double-dipped reflectance spectrum which can be modulated by tunable electro-optic effects in the superlattice cavity. Our demonstration device has a modulation depth of > 10% over a 20 nm bandwidth with < 4 V of bias swing. RP FRITZ, IJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 11 Z9 11 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 AUG 12 PY 1991 VL 59 IS 7 BP 753 EP 755 DI 10.1063/1.105332 PG 3 WC Physics, Applied SC Physics GA GA596 UT WOS:A1991GA59600001 ER PT J AU MCKEE, RA WALKER, FJ CONNER, JR SPECHT, ED ZELMON, DE AF MCKEE, RA WALKER, FJ CONNER, JR SPECHT, ED ZELMON, DE TI MOLECULAR-BEAM EPITAXY GROWTH OF EPITAXIAL BARIUM SILICIDE, BARIUM OXIDE, AND BARIUM-TITANATE ON SILICON SO APPLIED PHYSICS LETTERS LA English DT Article AB Thin-film epitaxial structures of BaSi2, BaO, and BaTiO3, have been grown on the (001) face of silicon using ultrahigh vacuum, molecular beam epitaxy (MBE) methods. Source shuttering for the metal species coordinated with a pulsed, or cyclic, oxygen arrival at the growing oxide surfaces significantly improves film quality. The epitaxial growth of BaO is accomplished without silica formation at the BaO/Si interface by stabilizing BaSi2 as a submonolayer template structure. In situ ellipsometric measurements of the indices of refraction for BaO and for BaTiO3 in a BaTiO3/BaO/Si multilayer gave n = 1.96 for BaO and n = 2.2 for the BaTiO3, within 10% of their bulk values. These values suggest that this structure can be developed as an optical waveguide. BaO is impermeable to silicon for films as thin as 10 nm at temperatures as high as 800-degrees-C, and good epitaxy can be obtained from room temperature to 800-degrees-C. The epitaxy is such that BaTiO3(001) parallel-to BaO(001) parallel-to Si(001) and BaTiO 3<110> parallel-to BaO<100> parallel-to Si<100>. C1 WRIGHT RES & DEV CTR,WRIGHT PATTERSON AFB,OH 45533. UNIV TENNESSEE,KNOXVILLE,TN 37996. OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830. RP MCKEE, RA (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37830, USA. RI Specht, Eliot/A-5654-2009; OI Specht, Eliot/0000-0002-3191-2163; Walker, Frederick/0000-0002-8094-249X NR 11 TC 137 Z9 138 U1 4 U2 24 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 12 PY 1991 VL 59 IS 7 BP 782 EP 784 DI 10.1063/1.105341 PG 3 WC Physics, Applied SC Physics GA GA596 UT WOS:A1991GA59600011 ER PT J AU CARSON, RF HUGHES, RC WEAVER, HT KESHAVAREZ, AA AF CARSON, RF HUGHES, RC WEAVER, HT KESHAVAREZ, AA TI LONG SWITCHING DELAY MECHANISMS FOR OPTICALLY TRIGGERED GAAS THYRISTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID HETEROSTRUCTURE OPTOELECTRONIC SWITCH; RADIATION RESPONSE; MEMORY AB Long switching delays following optical triggering of GaAs thyristors are shown to result from near cancellation of carrier lifetime and current regeneration effects. Numerical simulations and analytical models account for the long delays, which are measured to be more than an order of magnitude larger than any lifetime or transit time in the device. Since the thyristor is in a low current state during the delay, this switching phenomena represents a form of dynamic information storage. C1 UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131. RP CARSON, RF (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 9 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 12 PY 1991 VL 59 IS 7 BP 834 EP 836 DI 10.1063/1.105251 PG 3 WC Physics, Applied SC Physics GA GA596 UT WOS:A1991GA59600029 ER PT J AU CAMPBELL, IH SELA, I LAURICH, BK SMITH, DL BOLOGNESI, CR SAMOSKA, LA GOSSARD, AC KROEMER, H AF CAMPBELL, IH SELA, I LAURICH, BK SMITH, DL BOLOGNESI, CR SAMOSKA, LA GOSSARD, AC KROEMER, H TI FAR-INFRARED PHOTORESPONSE OF THE INAS/GAINSB SUPERLATTICE SO APPLIED PHYSICS LETTERS LA English DT Article ID K-P THEORY; ELECTRONIC-STRUCTURE; DETECTORS AB We describe the growth and characterization of the InAs/GaInSb superlattice on GaSb substrates. We present far-infrared (lambda approximately 10-mu-m) photoabsorption and photoconductivity spectra which are in good agreement with theoretical predictions for the photoresponse of this spatially indirect superlattice. We report time-resolved photoconductivity measurements in which two response times are observed. We interpret the fast, 2 ns decay as resulting from electron-hole recombination via deep defect levels and the slow, 2-mu-s decay as resulting from recombination of a small fraction of the photogenerated minority carriers which become trapped at a defect site. C1 UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106. UNIV CALIF SANTA BARBARA,DEPT ENGN MAT,SANTA BARBARA,CA 93106. RP CAMPBELL, IH (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 9 TC 46 Z9 46 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 12 PY 1991 VL 59 IS 7 BP 846 EP 848 DI 10.1063/1.105255 PG 3 WC Physics, Applied SC Physics GA GA596 UT WOS:A1991GA59600033 ER PT J AU RUCKMAN, MW CAO, JM PARK, KT GAO, YL WICKS, GW AF RUCKMAN, MW CAO, JM PARK, KT GAO, YL WICKS, GW TI PHOTON-ASSISTED NITRIDATION OF GAAS(100) AT LIQUID-NITROGEN TEMPERATURE SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; GAAS 001; SURFACES; SILICON; PASSIVATION; HYDROGEN; PLASMAS; AMMONIA; NH3 AB We show that nonmonochromatic synchrotron radiation promotes reactions at liquid-nitrogen temperature (approximately 80 K) between NH3 and molecular beam epitaxy grown GaAs(100) which produces a thin nitride film. The photon-assisted reaction causes changes in the valence band and core level photoemission spectra from GaAs(100) which are similar to those reported for nitridation by a nitrogen plasma. C1 UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627. UNIV ROCHESTER,INST OPT,ROCHESTER,NY 14627. RP RUCKMAN, MW (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Schaff, William/B-5839-2009; Gao, Yongli/N-8392-2015 OI Gao, Yongli/0000-0001-9765-5246 NR 26 TC 15 Z9 15 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 12 PY 1991 VL 59 IS 7 BP 849 EP 851 DI 10.1063/1.105256 PG 3 WC Physics, Applied SC Physics GA GA596 UT WOS:A1991GA59600034 ER PT J AU PINES, A AF PINES, A TI C-13 NMR IN SOLIDS - A CITATION-CLASSIC COMMENTARY ON PROTON-ENHANCED NMR OF DILUTE SPINS IN SOLIDS BY PINES,A., GIBBY,M. AND WAUGH,J.S. SO CURRENT CONTENTS/ENGINEERING TECHNOLOGY & APPLIED SCIENCES LA English DT Article C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP PINES, A (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU INST SCI INFORM INC PI PHILADELPHIA PA 3501 MARKET ST, PHILADELPHIA, PA 19104 SN 0011-3395 J9 CC/ENG TECH APPL SCI PD AUG 12 PY 1991 IS 32 BP 10 EP 10 PG 1 WC Multidisciplinary Sciences; Social Sciences, Interdisciplinary SC Science & Technology - Other Topics; Social Sciences - Other Topics GA FY135 UT WOS:A1991FY13500001 ER PT J AU PINES, A AF PINES, A TI C-13 NMR IN SOLIDS - A CITATION-CLASSIC COMMENTARY ON PROTON-ENHANCED NMR OF DILUTE SPINS IN SOLIDS BY PINES,A., GIBBY,M.G., AND WAUGH,J.S. SO CURRENT CONTENTS/PHYSICAL CHEMICAL & EARTH SCIENCES LA English DT Article C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP PINES, A (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. NR 2 TC 0 Z9 0 U1 1 U2 1 PU INST SCI INFORM INC PI PHILADELPHIA PA 3501 MARKET ST, PHILADELPHIA, PA 19104 SN 0163-2574 J9 CC/PHYS CHEM EARTH PD AUG 12 PY 1991 IS 32 BP 10 EP 10 PG 1 WC Multidisciplinary Sciences; Social Sciences, Interdisciplinary SC Science & Technology - Other Topics; Social Sciences - Other Topics GA FY134 UT WOS:A1991FY13400001 ER PT J AU WEINBERG, AM AF WEINBERG, AM TI ORIGINS OF CRITERIA FOR SCIENTIFIC CHOICE - A CITATION-CLASSIC COMMENTARY ON CRITERIA FOR SCIENTIFIC CHOICE BY WEINBERG,A.M. SO CURRENT CONTENTS/SOCIAL & BEHAVIORAL SCIENCES LA English DT Article RP WEINBERG, AM (reprint author), OAK RIDGE ASSOCIATED UNIV,POB 117,OAK RIDGE,TN 37831, USA. NR 7 TC 0 Z9 0 U1 0 U2 2 PU INST SCI INFORM INC PI PHILADELPHIA PA 3501 MARKET ST, PHILADELPHIA, PA 19104 SN 0092-6361 J9 CC/SOC BEHAV SCI PD AUG 12 PY 1991 IS 32 BP 10 EP 10 PG 1 WC Multidisciplinary Sciences; Social Sciences, Interdisciplinary SC Science & Technology - Other Topics; Social Sciences - Other Topics GA FY131 UT WOS:A1991FY13100001 ER PT J AU LEE, TSH PEARCE, BC AF LEE, TSH PEARCE, BC TI MESON-EXCHANGE CALCULATION OF THE GAMMA-N-]PI-N REACTION SO NUCLEAR PHYSICS A LA English DT Article ID NEUTRAL PION-PHOTOPRODUCTION; QUARK-MODEL; THRESHOLD AB Within the hamiltonian model of Nozawa, Blankleider and Lee, the meson exchange pi-N model developed by Pearce and Jennings is used to calculate the effects of the pi-N final-state interaction on the gamma-N --> pi-N reaction. It is found that the results for charged pion production processes are comparable to that of earlier calculations using separable pi-N models. The main improvement is a much better description of the neutral pion production process from threshold to about 400 MeV incident photon energy. C1 TRIUMF, VANCOUVER V6T 2A3, BC, CANADA. FORSCHUNGSZENTRUM JULICH, INST KERNPHYS, W-5170 JULICH 1, GERMANY. RP LEE, TSH (reprint author), ARGONNE NATL LAB, DIV PHYS, ARGONNE, IL 60439 USA. NR 14 TC 18 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 12 PY 1991 VL 530 IS 3-4 BP 532 EP 538 DI 10.1016/0375-9474(91)90767-Z PG 7 WC Physics, Nuclear SC Physics GA GD495 UT WOS:A1991GD49500002 ER PT J AU MALTMAN, K GOLDMAN, T STEPHENSON, GJ AF MALTMAN, K GOLDMAN, T STEPHENSON, GJ TI CHARGE SYMMETRY-BREAKING IN THE A=3 SYSTEM AND ELECTROMAGNETIC PENGUINS (OF THE 2ND KIND) SO NUCLEAR PHYSICS A LA English DT Article ID CHIRAL PERTURBATION-THEORY; QUARK-MODEL; GROUND-STATE; HYPERFINE INTERACTIONS; STRANGE QUARK; MASS RATIOS; ASYMMETRY; BARYONS; CHROMODYNAMICS; EXPANSIONS AB We discuss difficulties with the traditional understanding of the origins of the non-coulombic portion of the H-3-He-3 binding energy difference (DELTA-BE) and analyze the contribution to DELTA-BE arising from certain mixed QED x QCD effects which are known to be important to the generation of isomultiplet splittings in the hadron spectrum. This contribution is shown, on general grounds, to be of O(100 keV) and, in the context of the quark cluster model, dominated by a single quark magnetic term, barring unnatural cancellations. More accurate data on SIGMA, SIGMA* and SIGMA-c isomultiplet splittings would help to pin down the model estimate more precisely. Despite the uncertainties, the A = 3 binding energy difference is noteworthy as an example of a nuclear observable for which quark level effects do not appear well represented by effective operators at the nucleon level. C1 UNIV CALIF LOS ALAMOS SCI LAB,DEPT PHYS,LOS ALAMOS,NM 87545. UNIV TORONTO,DEPT PHYS,TORONTO M5S 1A7,ONTARIO,CANADA. RP MALTMAN, K (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 43 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 12 PY 1991 VL 530 IS 3-4 BP 539 EP 554 DI 10.1016/0375-9474(91)90768-2 PG 16 WC Physics, Nuclear SC Physics GA GD495 UT WOS:A1991GD49500003 ER PT J AU COLLINS, JC ELLIS, RK AF COLLINS, JC ELLIS, RK TI HEAVY-QUARK PRODUCTION IN VERY-HIGH-ENERGY HADRON-COLLISIONS SO NUCLEAR PHYSICS B LA English DT Article ID SEMIHARD PROCESSES; QCD AB The hadroproduction of heavy quarks is studied in the kinematic regime in which square-root s is very much greater than the mass of the produced heavy quark. We introduce a modification of the normal Lipatov equation which allows a factorization between the short-distance and long-distance physics. Numerical results are provided using the cross section for b-quark production as an example. C1 FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. RP COLLINS, JC (reprint author), PENN STATE UNIV,DEPT PHYS,UNIVERSITY PK,PA 16802, USA. OI Collins, John/0000-0001-6399-9251 NR 24 TC 500 Z9 507 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 AUG 12 PY 1991 VL 360 IS 1 BP 3 EP 30 DI 10.1016/0550-3213(91)90288-9 PG 28 WC Physics, Particles & Fields SC Physics GA FX129 UT WOS:A1991FX12900001 ER PT J AU VOGT, R BRODSKY, SJ HOYER, P AF VOGT, R BRODSKY, SJ HOYER, P TI SYSTEMATICS OF J/PSI PRODUCTION IN NUCLEAR COLLISIONS SO NUCLEAR PHYSICS B LA English DT Article ID TRANSVERSE-MOMENTUM DEPENDENCE; HEAVY-ION COLLISIONS; TOTAL CROSS-SECTIONS; J-PSI SUPPRESSION; DISTRIBUTIONS; PROTON; OXYGEN; HADROPRODUCTION; SCATTERING; CHARM AB We present a comprehensive QCD-based model for the x(f) and nuclear dependences of heavy quarkonium production in photon-, hadron-, and nuclear-induced collisions. The calculated x(f) dependence reflects both leading-twist QCD fusion subprocesses and higher-twist intrinsic heavy-quark components of the hadron wavefunction. A-dependent effects due to final-state absorption, interactions with comovers, shadowing of parton distributions, and intrinsic heavy-quark components are identified. The model is compared with data for J/psi, psi', and UPSILON-production in pion-, proton-, and nucleus-nucleus collisions. C1 STANFORD UNIV, STANFORD LINEAR ACCELERATOR CTR, STANFORD, CA 94305 USA. RP UNIV CALIF LAWRENCE LIVERMORE NATL LAB, POB 808, LIVERMORE, CA 94550 USA. NR 51 TC 105 Z9 105 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD AUG 12 PY 1991 VL 360 IS 1 BP 67 EP 96 DI 10.1016/0550-3213(91)90435-Z PG 30 WC Physics, Particles & Fields SC Physics GA FX129 UT WOS:A1991FX12900003 ER PT J AU ANDERSSON, B AF ANDERSSON, B TI ON THE PROPERTIES OF THE COLOR DIPOLES IN QCD SO NUCLEAR PHYSICS B LA English DT Article ID MULTIPLICITY DISTRIBUTIONS; JETS; COHERENCE; CASCADES AB In this paper I will undertake a detailed investigation of the local properties of the color diPoles, i.e. two color connected neighbours, in a QCD cascade. It is known that it is a good approximation (which incorporates in particular "the strong angular ordering conditions" corresponding to coherence) to treat the cascade as proceeding through repeated emission of gluons from such dipoles. The dipole motion reflects basically the motion of a Lund String, in which the gluons are treated as internal kink excitations on the string. Therefore a description of the local properties of the dipoles is basically a description of the behaviour of the String before fragmentation. My major findings are that the dipoles have a (logarithmic) size distribution which settles into a gaussian-like shape, that they show short-range correlations and that they have a multiplicity distribution similar to the blackbody radiation in QED. The dipoles in this description are not color neutral objects. The size of a dipole as used in this paper does, however, reflect the phase space region (at the given virtuality) inside which a color produced in the cascade is neutralised. It is interesting to note that the dipoles in a nonabelian field theory like QCD, which are close to "neutrality", also behave very similar to the (neutral) photon field quanta in the abelian QED. The relative simplicity to describe the rather complex QCD cascades indicates that it may be worthwhile to try to quantise the theory in terms of such objects. I will use classical gain-loss considerations leading to first-order partial differential equations with simple solutions. I show the close relationship to the corresponding renormalisation group treatment in terms of Callan-Symanzik equations. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP ANDERSSON, B (reprint author), SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794, USA. NR 16 TC 7 Z9 7 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 AUG 12 PY 1991 VL 360 IS 1 BP 109 EP 141 DI 10.1016/0550-3213(91)90437-3 PG 33 WC Physics, Particles & Fields SC Physics GA FX129 UT WOS:A1991FX12900005 ER PT J AU DIEHL, HT TEIGE, S THOMSON, GB ZOU, Y JAMES, C LUK, KB RAMEIKA, R HO, PM LONGO, MJ NGUYEN, A DURYEA, J GUGLIELMO, G JOHNS, K HELLER, K THORNE, K AF DIEHL, HT TEIGE, S THOMSON, GB ZOU, Y JAMES, C LUK, KB RAMEIKA, R HO, PM LONGO, MJ NGUYEN, A DURYEA, J GUGLIELMO, G JOHNS, K HELLER, K THORNE, K TI MEASUREMENT OF THE OMEGA-MAGNETIC MOMENT SO PHYSICAL REVIEW LETTERS LA English DT Article ID PRECISE MEASUREMENT; PRODUCTION POLARIZATION; HYPERON; PROTONS; DECAYS; MODEL AB A sample of 24700 OMEGA- hyperons was produced by a polarized neutral beam in a spin-transfer reaction. The OMEGA- polarizations are found to be -0.054 +/- 0.019 and -0.149 +/- 0.055 at mean OMEGA- momenta of 322 and 398 GeV/c, respectively. The directions of these polarizations give an OMEGA- magnetic moment of -1.94 +/- 0.17 +/- 0.14 nuclear magnetrons. C1 RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. RP DIEHL, HT (reprint author), FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 31 TC 43 Z9 43 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 12 PY 1991 VL 67 IS 7 BP 804 EP 807 DI 10.1103/PhysRevLett.67.804 PG 4 WC Physics, Multidisciplinary SC Physics GA GB697 UT WOS:A1991GB69700008 ER PT J AU VINOKUR, VM FEIGELMAN, MV GESHKENBEIN, VB AF VINOKUR, VM FEIGELMAN, MV GESHKENBEIN, VB TI EXACT SOLUTION FOR FLUX CREEP WITH LOGARITHMIC U(J) DEPENDENCE - SELF-ORGANIZED CRITICAL STATE IN HIGH-TC SUPERCONDUCTORS SO PHYSICAL REVIEW LETTERS LA English DT Article AB An exact solution describing flux creep in high-T(c) superconductors is found, assuming the creep activation barrier U grows logarithmically with decreasing current j: U = U0ln(j0/j). For incomplete flux penetration, the flux density B is a function of the single variable-xi = x/t1/(sigma + 2), sigma = U0/T, and the system considered exhibits self-organized criticality. In a fully penetrated sample, B depends separately upon x and t. A sharp transition between these regimes occurs when the flux fronts from opposite sides of the sample meet, resulting in a kink in the magnetization relaxation curve. C1 LD LANDAU THEORET PHYS INST,MOSCOW,USSR. CHERNOGOLOVKA SOLID STATE PHYS INST,CHERNOGOLOVKA,USSR. RP VINOKUR, VM (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Feigelman, Mikhail/M-4113-2013 NR 19 TC 199 Z9 200 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 12 PY 1991 VL 67 IS 7 BP 915 EP 918 DI 10.1103/PhysRevLett.67.915 PG 4 WC Physics, Multidisciplinary SC Physics GA GB697 UT WOS:A1991GB69700036 ER PT J AU JELLISON, GE AF JELLISON, GE TI USE OF THE BIASED ESTIMATOR IN THE INTERPRETATION OF SPECTROSCOPIC ELLIPSOMETRY DATA SO APPLIED OPTICS LA English DT Article ID THERMALLY GROWN OXIDE; ELEVATED-TEMPERATURES; SILICON; SI; INTERFACE AB The use of the biased estimator in the fitting of spectroscopic ellipsometry data is examined and applied to data from two-channel polarization modulation ellipsometry experiments. It is pointed out that the use of the biased estimator, as opposed to the unbiased estimator that is usually found in the literature, allows the experimentalist to weight properly the more accurate parts of the spectrum, to switch among different representations of the data, and to calculate a goodness of fit. The fit to data taken on a 59-nm SiO2 film on Si is examined with both the biased and the unbiased estimators. RP JELLISON, GE (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. NR 23 TC 81 Z9 83 U1 0 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD AUG 10 PY 1991 VL 30 IS 23 BP 3354 EP 3360 PG 7 WC Optics SC Optics GA FZ850 UT WOS:A1991FZ85000015 PM 20706400 ER PT J AU CONTINETTI, RE BALKO, BA LEE, YT AF CONTINETTI, RE BALKO, BA LEE, YT TI PHOTODISSOCIATION OF H2S AND THE HS RADICAL AT 193.3 NM SO CHEMICAL PHYSICS LETTERS LA English DT Article ID 1ST ABSORPTION-BAND; EMISSION-SPECTROSCOPY; DYNAMICS; PHOTOFRAGMENTATION; DISSOCIATION; CH3I AB Photodissociation of H2S has been studied at 193.3 nm using H atom photofragment-translational spectroscopy with mass-spectrometric detection. H + HS(nu) product branching ratios are reported which are not in quantitative agreement with other recent experimental results. Secondary photodissociation of HS radicals has also been observed, showing that both S(3P) and S(1D) are produced via perpendicular transitions. The HS bond energy was found to be 3.62 +/- 0.03 eV. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP CONTINETTI, RE (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012; OI Continetti, Robert/0000-0002-0685-4459 NR 26 TC 89 Z9 91 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD AUG 9 PY 1991 VL 182 IS 5 BP 400 EP 405 DI 10.1016/0009-2614(91)90097-S PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GB805 UT WOS:A1991GB80500003 ER PT J AU CONTINETTI, RE CYR, DR METZ, RB NEUMARK, DM AF CONTINETTI, RE CYR, DR METZ, RB NEUMARK, DM TI FAST BEAM STUDIES OF N3 PHOTODISSOCIATION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID FLIGHT MASS-SPECTROMETER; NEGATIVE-IONS; DISSOCIATION-ENERGY; LASER SPECTROSCOPY; N-3; BAND; TIME; PHOTODETACHMENT; NU-3 AB A new fast radical beam apparatus has been used to study the photodissociation cross section of N3 as a function of wavelength. Neutralization of a fast negative ion beam by photodetachment is used to create a beam of cold. mass-selected radicals, with subsequent photodissociation and efficient detection of the neutral fragments. N3 was observed to predissociate throughout the first electronic absorption near 270 nm. High-resolution predissociation spectra were obtained which show rotationally resolved structure. Time-of-flight measurements of the kinetic energy release confirm that the lowest energy dissociation pathway which occurs is the first spin-allowed channel producing N(2D) + N2(1-SIGMA-g+). The photoelectron spectrum of N3- was also obtained, yielding an electron affinity of 2.68 +/- 0.01 eV for N3. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. RP CONTINETTI, RE (reprint author), UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI Metz, Ricardo/E-8856-2010; Neumark, Daniel/B-9551-2009; OI Neumark, Daniel/0000-0002-3762-9473; Metz, Ricardo/0000-0003-1933-058X; Continetti, Robert/0000-0002-0685-4459 NR 30 TC 68 Z9 68 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD AUG 9 PY 1991 VL 182 IS 5 BP 406 EP 411 DI 10.1016/0009-2614(91)90098-T PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GB805 UT WOS:A1991GB80500004 ER PT J AU WILLIAMS, LR ANDERSON, RJM BANET, MJ AF WILLIAMS, LR ANDERSON, RJM BANET, MJ TI TIME-RESOLVED ULTRAFAST SPECTROSCOPY OF COHERENT OPTICAL PHONONS AND CHARGE-CARRIERS IN TETRAGONAL MERCURIC IODIDE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID PICOSECOND; DYNAMICS; PHOTOLUMINESCENCE; DISPERSION; ABSORPTION; RELAXATION; HGI2; GAP AB Subpicosecond time-resolved transient grating experiments were performed in mercuric iodide, a wide band gap semiconductor. Hot carriers created by two-photon absorption cooled within a few picoseconds to form the free exciton. The free exciton lifetime was 1.8 +/- 0.2 ns. Coherent Raman excitation of the 114 cm-1 A1g lattice mode was observed. RP WILLIAMS, LR (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 26 TC 7 Z9 7 U1 0 U2 1 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 AUG 9 PY 1991 VL 182 IS 5 BP 422 EP 428 DI 10.1016/0009-2614(91)90101-E PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GB805 UT WOS:A1991GB80500007 ER PT J AU TERMINELLO, LJ SHUH, DK HIMPSEL, FJ LAPIANOSMITH, DA STOHR, J BETHUNE, DS MEIJER, G AF TERMINELLO, LJ SHUH, DK HIMPSEL, FJ LAPIANOSMITH, DA STOHR, J BETHUNE, DS MEIJER, G TI UNFILLED ORBITALS OF C-60 AND C-70 FROM CARBON K-SHELL X-RAY ABSORPTION FINE-STRUCTURE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ELECTRON BINDING-ENERGIES; ICOSAHEDRAL C-60; GASEOUS ATOMS; MOLECULES; C60; BUCKMINSTERFULLERENE; PREDICTION; CLUSTER; SPECTRA AB The K-shell near-edge X-ray absorption fine structure spectra of solid C60 and C70 have been recorded with high spectral resolution. The spectra exhibit sharp resonances associated with transitions to unfilled pi*-molecular orbitals and, at higher energy, broader resonances associated with sigma*-like orbitals. The observed energy splitting of the pi* resonances can be accounted for by published extended Huckel calculations. Our data clearly reveal that the fullerene films resemble molecular solids with considerably stronger intra-molecular than inter-molecular interactions. C1 UNIV CALIF RIVERSIDE,DEPT PHYS,RIVERSIDE,CA 92521. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. IBM CORP,ALMADEN RES CTR,DIV RES,SAN JOSE,CA 95120. CATHOLIC UNIV NIJMEGEN,DEPT MOLEC & LASER PHYS,6525 ED NIJMEGEN,NETHERLANDS. RP TERMINELLO, LJ (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Meijer, Gerard/D-2141-2009 NR 36 TC 108 Z9 108 U1 1 U2 10 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 AUG 9 PY 1991 VL 182 IS 5 BP 491 EP 496 DI 10.1016/0009-2614(91)90113-N PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GB805 UT WOS:A1991GB80500019 ER PT J AU JIE, Z KATTI, AM GUIOCHON, G AF JIE, Z KATTI, AM GUIOCHON, G TI COMPARISON OF VARIOUS ISOTHERM MODELS FOR PREDICTING COMPETITIVE ADSORPTION DATA SO JOURNAL OF CHROMATOGRAPHY LA English DT Article; Proceedings Paper CT 18TH INTERNATIONAL SYMP ON CHROMATOGRAPHY CY SEP 23-28, 1990 CL AMSTERDAM, NETHERLANDS SP ROYAL NETHERLANDS CHEM SOC, CHROMATOG SOC ID NONLINEAR LIQUID-CHROMATOGRAPHY; THEORETICAL BAND PROFILES; IDEAL MODEL; COMPUTER-SIMULATION; MOBILE PHASE; BINARY; PROPAGATION; LANGMUIR AB Competitive adsorption isotherms were determined for 2-phenylethanol and 3-phenylpropanol on ODS-silica with methanol-water as the mobile phase. The experimental data were fitted to the Langmuir competitive isotherm, the second-order ideal adsorbed solution isotherm of LeVan and Vermeulen, the seven-parameter quadratic isotherm (ratio of two second-degree polynomials) and the competitive Fowler isotherm. The best results were obtained by adjusting the five parameters of the competitive Fowler isotherm by a non-linear regression. Unfortunately, this isotherm gives the mobile phase concentration as a function of the surface coverage and the equation cannot be inverted in closed form. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. UNIV TENNESSEE,DEPT CHEM ENGN,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37830. NR 29 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD AUG 9 PY 1991 VL 552 IS 1-2 BP 71 EP 89 PG 19 WC Chemistry, Analytical SC Chemistry GA GE762 UT WOS:A1991GE76200009 ER PT J AU LIPFERT, FW MORRIS, SC AF LIPFERT, FW MORRIS, SC TI AIR-POLLUTION BENEFIT-COST ASSESSMENT SO SCIENCE LA English DT Letter ID LOS-ANGELES; AEROSOLS; ACID RP LIPFERT, FW (reprint author), ASSOC UNIV INC,BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 18 TC 4 Z9 4 U1 1 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 AUG 9 PY 1991 VL 253 IS 5020 BP 606 EP 606 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GA304 UT WOS:A1991GA30400002 ER PT J AU HUBBARD, WB NELLIS, WJ MITCHELL, AC HOLMES, NC LIMAYE, SS MCCANDLESS, PC AF HUBBARD, WB NELLIS, WJ MITCHELL, AC HOLMES, NC LIMAYE, SS MCCANDLESS, PC TI INTERIOR STRUCTURE OF NEPTUNE - COMPARISON WITH URANUS SO SCIENCE LA English DT Article ID PLANETARY ICES; JUPITER; TEMPERATURE; PRESSURE; ROTATION; SATURN AB Measurements of rotation rates and gravitational harmonics of Neptune made with the Voyager 2 spacecraft allow tighter constraints on models of the planet's interior. Shock measurements of material that may match the composition of Neptune, the so-called planetary "ice," have been carried out to pressures exceeding 200 gigapascals (2 megabars). Comparison of shock data with inferred pressure-density profiles for both Uranus and Neptune shows substantial similarity through most of the mass of both planets. Analysis of the effect of Neptune's strong differential rotation on its gravitational harmonics indicates that differential rotation involves only the outermost few percent of Neptune's mass. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV WISCONSIN,CTR SPACE SCI & ENGN,MADISON,WI 53706. RP HUBBARD, WB (reprint author), UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721, USA. NR 28 TC 93 Z9 94 U1 0 U2 10 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD AUG 9 PY 1991 VL 253 IS 5020 BP 648 EP 651 DI 10.1126/science.253.5020.648 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GA304 UT WOS:A1991GA30400034 PM 17772369 ER PT J AU GOLSHANSHIRAZI, S GUIOCHON, G AF GOLSHANSHIRAZI, S GUIOCHON, G TI COMBINED EFFECTS OF FINITE AXIAL-DISPERSION AND SLOW ADSORPTION DESORPTION-KINETICS ON BAND PROFILES IN NONLINEAR CHROMATOGRAPHY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MASS-TRANSFER KINETICS; LIQUID-CHROMATOGRAPHY; AFFINITY-CHROMATOGRAPHY; COMPUTER-SIMULATIONS; SCALE SEPARATIONS; BINARY MIXTURE; ELUTION AB The analytical solutions of the Thomas model derived by Goldstein and Wade et al. are compared to numerical solutions of the Thomas and the reaction-diffusive models. The latter model includes the axial dispersion, neglected in the Thomas model, as well as the kinetics of the reaction mechanism. The solutions of the two models converge when the contribution of the axial dispersion becomes small compared to that of the reaction kinetics. However, when the mass-transfer kinetics is the rate-determining step or when the rates of the mass transfer and the reaction kinetics are of the same order, important differences between the solutions of the two models are observed. If the kinetics of the retention mechanism is very slow and the split peak phenomenon takes place, numerical solutions of either model predict the entire band profile while the analytical solutions of the Thomas model remain unable to predict the profile of the unretained part of the split peak. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 27 TC 8 Z9 8 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 8 PY 1991 VL 95 IS 16 BP 6390 EP 6395 DI 10.1021/j100169a057 PG 6 WC Chemistry, Physical SC Chemistry GA GA417 UT WOS:A1991GA41700057 ER PT J AU WOLPERT, D AF WOLPERT, D TI ANIMAL RIGHTS SO NATURE LA English DT Letter C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP WOLPERT, D (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 1 TC 2 Z9 2 U1 0 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD AUG 8 PY 1991 VL 352 IS 6335 BP 466 EP 466 DI 10.1038/352466b0 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GA226 UT WOS:A1991GA22600021 PM 1865899 ER PT J AU MIKLICH, AH WELLSTOOD, FC KINGSTON, JJ CLARKE, J COLCLOUGH, MS CHAR, K ZAHARCHUK, G AF MIKLICH, AH WELLSTOOD, FC KINGSTON, JJ CLARKE, J COLCLOUGH, MS CHAR, K ZAHARCHUK, G TI THIN-FILM YBCO MAGNETOMETER SO NATURE LA English DT Letter C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. CONDUCTUS INC,SUNNYVALE,CA 94086. RP MIKLICH, AH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Joint Quantum Institute, NIST/UMD/H-4494-2011 NR 5 TC 7 Z9 7 U1 0 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD AUG 8 PY 1991 VL 352 IS 6335 BP 482 EP 483 DI 10.1038/352482c0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GA226 UT WOS:A1991GA22600043 ER PT J AU GINOCCHIO, JN AF GINOCCHIO, JN TI A SUM-RULE FOR B(M1) STRENGTH SO PHYSICS LETTERS B LA English DT Article ID PROTON; NUCLEI; SYMMETRY; MODEL AB A sum rule for B(M1) strength is derived within the interacting boson model. This sum rule is used to extract the average number of quadrupole bosons in the ground states of collective nuclei. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP GINOCCHIO, JN (reprint author), MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. NR 14 TC 49 Z9 49 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 AUG 8 PY 1991 VL 265 IS 1-2 BP 6 EP 8 DI 10.1016/0370-2693(91)90003-9 PG 3 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GD328 UT WOS:A1991GD32800002 ER PT J AU CASTEN, RF ZAMFIR, NV VONBRENTANO, P SEIFFERT, F LIEBERZ, W AF CASTEN, RF ZAMFIR, NV VONBRENTANO, P SEIFFERT, F LIEBERZ, W TI EVIDENCE FOR AN F-BOSON O(6) COUPLING SCHEME FROM SIGNATURE SPLITTING EFFECTS SO PHYSICS LETTERS B LA English DT Article ID OCTUPOLE STATES; DEFORMED-NUCLEI; MODEL; DEFORMATION AB Striking experimental differences in the signature splitting in gamma-bands and negative-parity bands in the axially asymmetric A = 130 region are interpreted as manifesting the coupling of an f-boson (l = 3) to an O(6) IBM core. C1 UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE,GERMANY. INST ATOM PHYS,R-76900 BUCHAREST,ROMANIA. RP CASTEN, RF (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Zamfir, Nicolae Victor/F-2544-2011 NR 27 TC 16 Z9 17 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 AUG 8 PY 1991 VL 265 IS 1-2 BP 9 EP 13 DI 10.1016/0370-2693(91)90004-A PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA GD328 UT WOS:A1991GD32800003 ER PT J AU BRESHEARS, WD FRY, HA SHEA, RF WILSON, CW AF BRESHEARS, WD FRY, HA SHEA, RF WILSON, CW TI ROOM-TEMPERATURE RATE CONSTANTS FOR THE REACTION D + O2 + M-]DO2 + M - M = AR, D2, CO2 AND F2 SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article ID HIGHLY EXCITED DIATOMICS; VIBRATIONAL-RELAXATION; CO2; HF; DEPENDENCE; KINETICS; N2O; H-2; HO2 AB Reaction in mixtures of D2-F2-O2-CO2 dilute in Ar has been initiated by pulsed irradiation with a XeCl laser, and the resulting time-dependent infrared emission from the nu-3 vibrational band of CO2 has been monitored. Experimental conditions were chosen such that the rate of DF formation and the decay of the emission were controlled by the rate of the reaction D + O2 + M --> DO2 + M. Rate constants (10(-32) cm6 s-1) at room temperature, determined from the measured emission decay, for M = Ar, CO2, D2 and F2 are 1.7 +/- 0.1, 15.9 +/- 1.0, 7.1 +/- 0.5 and 31.1 +/- 3.9, respectively. RP BRESHEARS, WD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 24 TC 1 Z9 1 U1 2 U2 3 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0956-5000 J9 J CHEM SOC FARADAY T JI J. Chem. Soc.-Faraday Trans. PD AUG 7 PY 1991 VL 87 IS 15 BP 2337 EP 2344 DI 10.1039/ft9918702337 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FZ695 UT WOS:A1991FZ69500009 ER PT J AU KAR, S PANKOVE, JI TSUO, YS AF KAR, S PANKOVE, JI TSUO, YS TI REMOTE PLASMA HYDROGENATION OF ION-BEAM AMORPHIZED SILICON SO APPLIED PHYSICS LETTERS LA English DT Article ID A-SI; CRYSTALLINE SILICON; POST-HYDROGENATION; AMORPHOUS-SILICON AB In this investigation, the efficacy of remote plasma hydrogenation, in the passivation of bonding and other electronic defects in amorphous silicon, has been compared with those of ion beam and radio-frequency plasma hydrogenations. The amorphous silicon film was obtained by amorphization of the subsurface of ultrapure crystalline silicon by a Si ion beam. Electrical measurements indicated remote plasma hydrogenation to be a promising low-temperature defect removal technique, without the damaging effect of a plasma or the etching effects of low-energy hydrogen ions. C1 SOLAR ENERGY RES INST,GOLDEN,CO 80401. UNIV COLORADO,DEPT ELECT & COMP ENGN,BOULDER,CO 80309. RP KAR, S (reprint author), INDIAN INST TECHNOL,DEPT ELECT ENGN,KANPUR 208016,UTTAR PRADESH,INDIA. RI Kar, Samares/B-1657-2008 OI Kar, Samares/0000-0003-3935-1871 NR 12 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 5 PY 1991 VL 59 IS 6 BP 718 EP 720 DI 10.1063/1.105375 PG 3 WC Physics, Applied SC Physics GA FZ350 UT WOS:A1991FZ35000034 ER PT J AU TELSCHOW, KL OBRIEN, TK AF TELSCHOW, KL OBRIEN, TK TI NONCONTACTING ALTERNATING-CURRENT SURFACE PROBE MEASUREMENTS OF TRANSPORT CRITICAL CURRENTS IN A SLAB GEOMETRY SO APPLIED PHYSICS LETTERS LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; CRITICAL-STATE MODEL AB Determination of the critical state full penetration field of a slab of YBa2Cu3O7-x by induced screening currents is described. This geometry allows spatial measurements to be made by scanning with the probe coil even though nonuniform demagnetization effects are present. The onset of transport current dissipation was observed by the reduction of diamagnetism and appearance of dissipation in the probe coil induced current. The results are compared to contact four-point probe direct current measurements and to the critical state model. RP TELSCHOW, KL (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 9 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 AUG 5 PY 1991 VL 59 IS 6 BP 730 EP 732 DI 10.1063/1.105354 PG 3 WC Physics, Applied SC Physics GA FZ350 UT WOS:A1991FZ35000038 ER PT J AU READE, RP MAO, XL RUSSO, RE AF READE, RP MAO, XL RUSSO, RE TI CHARACTERIZATION OF Y-BA-CU-O THIN-FILMS AND YTTRIA-STABILIZED ZIRCONIA INTERMEDIATE LAYERS ON METAL-ALLOYS GROWN BY PULSED LASER DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID BUFFER LAYERS; YBA2CU3O7-DELTA; SUBSTRATE; OXIDE; SI AB The use of an intermediate layer is necessary for the growth of YBaCuO thin films on polycrystalline metallic alloys for tape conductor applications. A pulsed laser deposition process to grow controlled-orientation yttria-stabilized zirconia (YSZ) films as intermediate layers on Haynes Alloy No. 230 was developed and characterized. YBaCuO films deposited on these YSZ-coated substrates are primarily c-axis oriented and superconducting as deposited. The best YBaCuO films grow on (001) oriented YSZ intermediate layers and have T(c) (R = 0) = 86.0 K and J(c) approximately 3 X 10(3) A/cm 2 at 77 K. RP READE, RP (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV APPL SCI,BERKELEY,CA 94720, USA. NR 14 TC 51 Z9 52 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 AUG 5 PY 1991 VL 59 IS 6 BP 739 EP 741 DI 10.1063/1.105329 PG 3 WC Physics, Applied SC Physics GA FZ350 UT WOS:A1991FZ35000041 ER PT J AU PARK, S HANNA, ML TAYLOR, RT DROEGE, MW AF PARK, S HANNA, ML TAYLOR, RT DROEGE, MW TI BATCH CULTIVATION OF METHYLOSINUS-TRICHOSPORIUM OB3B .1. PRODUCTION OF SOLUBLE METHANE MONOOXYGENASE SO BIOTECHNOLOGY AND BIOENGINEERING LA English DT Article ID METHYLOCOCCUS-CAPSULATUS BATH; GAS-SOLID BIOREACTOR; MONO-OXYGENASE; INTRACELLULAR LOCATION; OBLIGATE METHANOTROPHS; GASEOUS HYDROCARBONS; OXIDIZING BACTERIUM; MICROBIAL OXIDATION; ALKENE OXIDATION; BIODEGRADATION AB Methanotrophs have promising applications in bioremediation and in the production of fuel-related chemicals due to their nonspecific enzyme, methane monooxygenase (MMO). The optimal conditions for cell growth and production of the soluble form of MMO (sMMO) were determined from batch cultivations of an obligatory methanotroph, Methylosinus trichosporium OB3b, in shake flasks and a 5-L bioreactor. It was confirmed that a copper deficiency is essential for the formation of the cytoplasmic sMMO. Optimum cell growth without added copper was observed at pH 6.0-70, temperature of 30-34-degrees-C, and phosphate concentration of 10-40 mM. In the bioreactor experiments, external CO2 addition eliminated the long lag period observed in the absence of added CuSO4, i.e., prior to the exponential cell growth phase. When methane was continuously supplied, the profile of the cell growth showed two different phases depending on the availability of nitrate, an initial fast exponential growth phase (specific growth rate, mu = 0.08 h-1) and a later slow growth phase (mu = 0.008 h-1). The cell density at the transition from a fast to a slow growth rate was proportional to the initial medium nitrate concentration in the range 5-20 mM and cell yield was estimated to be 7.14 g dry cell wt/g N. Whole-cell sMMO activity remained essentially constant regardless of the growth rate until cell growth stopped. With an initial medium iron concentration below 40 mM, an abrupt decrease in sMMO activity was observed. The lowered sMMO activity could be restored by supplying additional iron to the bioreactor culture. Cell yield on iron was estimated to be 1.3 x 10(3) g dry cell wt/g Fe. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. NR 33 TC 62 Z9 72 U1 3 U2 14 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0006-3592 J9 BIOTECHNOL BIOENG JI Biotechnol. Bioeng. PD AUG 5 PY 1991 VL 38 IS 4 BP 423 EP 433 DI 10.1002/bit.260380412 PG 11 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA FZ117 UT WOS:A1991FZ11700011 PM 18600778 ER PT J AU HROMAS, R COLLINS, SJ HICKSTEIN, D RASKIND, W DEAVEN, LL OHARA, P HAGEN, FS KAUSHANSKY, K AF HROMAS, R COLLINS, SJ HICKSTEIN, D RASKIND, W DEAVEN, LL OHARA, P HAGEN, FS KAUSHANSKY, K TI A RETINOIC ACID-RESPONSIVE HUMAN ZINC FINGER GENE, MZF-1, PREFERENTIALLY EXPRESSED IN MYELOID CELLS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID TRANSCRIPTION FACTOR-IIIA; SECONDARY-STRUCTURE; HUMAN-CHROMOSOMES; MULTIGENE FAMILY; BINDING DOMAINS; KRUPPEL FAMILY; PROTEIN; MOUSE; LOCALIZATION; SEQUENCE AB Zinc finger genes encode metal-binding proteins that can act as transcriptional regulators of other genes. In an effort to identify activators of the genetic cascade in hemopoietic differentiation, we used degenerate synthetic oligonucleotides to the conserved zinc finger histidine-cysteine link to probe a human myeloid lambda-gt11 cDNA library. One of the cDNA clones obtained hybridized preferentially to mRNA from myeloid cells. This cDNA was used to isolate clones encompassing the coding region for this gene. Sequence analysis found 13 zinc finger regions and a glycine-proline-rich region between the fourth and fifth zinc finger domain. The gene was localized to chromosome 19q13.2-4, a chromosome that has a large cluster of zinc finger genes. The gene was preferentially expressed in myeloid leukemia cell lines with the highest mRNA levels noted in HL-60 cells induced to differentiate with retinoic acid. Thus, this new zinc finger gene (designated MZF-1) may be one regulator of transcriptional events during hemopoietic development. C1 FRED HUTCHINSON CANC RES CTR,DEPT MOLEC MED,SEATTLE,WA 98104. UNIV WASHINGTON,SCH MED,DEPT MED,SEATTLE,WA 98195. UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. ZYMOGENET,SEATTLE,WA 98105. RP HROMAS, R (reprint author), INDIANA UNIV,MED CTR,DIV HEMATOL ONCOL,INDIANAPOLIS,IN 46202, USA. FU NCI NIH HHS [CA 16448, CA 31615] NR 44 TC 164 Z9 165 U1 0 U2 2 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD AUG 5 PY 1991 VL 266 IS 22 BP 14183 EP 14187 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FZ351 UT WOS:A1991FZ35100012 PM 1860835 ER PT J AU FICHANT, GA BURKS, C AF FICHANT, GA BURKS, C TI IDENTIFYING POTENTIAL TRANSFER-RNA GENES IN GENOMIC DNA-SEQUENCES SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE DNA SEQUENCE DATABASES; GENE STRUCTURE; PATTERN RECOGNITION; MACHINE LEARNING; TRANSFER RNA ID PROTEIN CODING REGIONS; SUPPRESSOR TRANSFER-RNA; NUCLEIC-ACID SEQUENCES; ESCHERICHIA-COLI; SACCHAROMYCES-CEREVISIAE; COMPUTER METHODS; RECOGNITION; IDENTIFICATION; INTEGRATION; PROGRAM RP FICHANT, GA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,THEORET BIOL & BIOPHYS GRP,T-10,MS K710,LOS ALAMOS,NM 87545, USA. FU NIGMS NIH HHS [GM-37812] NR 48 TC 98 Z9 98 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-2836 J9 J MOL BIOL JI J. Mol. Biol. PD AUG 5 PY 1991 VL 220 IS 3 BP 659 EP 671 DI 10.1016/0022-2836(91)90108-I PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GA302 UT WOS:A1991GA30200013 PM 1870126 ER PT J AU GRIFFIN, JC BRAGA, RA FINK, RW WOOD, JL CARTER, HK MLEKODAJ, RL BINGHAM, CR COENEN, E HUYSE, M VANDUPPEN, P AF GRIFFIN, JC BRAGA, RA FINK, RW WOOD, JL CARTER, HK MLEKODAJ, RL BINGHAM, CR COENEN, E HUYSE, M VANDUPPEN, P TI DECAY OF MASS-SEPARATED 3.0 MIN BI-195 TO LEVELS IN PB-195 AND SHAPE COEXISTENCE IN THE NEUTRON-DEFICIENT ODD-MASS PB ISOTOPES SO NUCLEAR PHYSICS A LA English DT Article DE BI-195[FROM TA-181(NE-20, 6N), E = 190 MEV; RE-185(O-16, 6N), E = 140, 210 MEV]; MEASURED E-GAMMA, I-GAMMA, I(CE), I(X-RAY), GAMMA-GAMMA(T),; (CE)GAMMA(T)GAMMA(X-RAY)(T),E(X-RAY)(T); PB-195 DEDUCED LEVELS, J, PI, ICC, GAMMA-MULTIPOLARITY; PO-199 [FROMIR-191(N-14, 6N), E = 127 MEV]; MEASURED E-GAMMA, I-GAMMA, E-ALPHA, I-ALPHA; DEDUCED Q-ALPHA, GAMMA-ALPHA; PB-195 DEDUCED LEVELS, J, PI; GE(LI), GE(HP), SI(LI), SI(AU) DETECTORS; MASS-SEPARATED SOURCES ID INTRUDER STATES; NUCLEAR MOMENTS; CHARGE-RADII; ALPHA-DECAY; 0+ STATES; TABLE AB The radioactive decay of mass-separated 3.0 m 195gBi to 195Pb has been studied with the UNISOR and LISOL facilities. Time-sequenced spectra of gamma-rays, X-rays, and conversion electrons have been obtained, together with gamma-gamma-t, gamma-Xt, e-gamma-t, and eXt coincidence data. From this information, a decay scheme has been constructed consisting of 23 excited states and 34 transitions in 195Pb. Transitions with E0 multipole admixtures, indicative of shape coexistence, have been found to de-excite positive-parity levels at 1093, 1329, and 1380 keV. The beta-decay energy of the 195Bi ground state is deduced to be Q(EC) = 4800(-550)+600 keV based on the measurement of gamma-ray-gated K/beta+-ratios. The excitation energy of the i13/2 isomer in 195Pb has been determined to be 203 +/- 4 keV from the alpha-decays of Po-199m,g. C1 KATHOLIEKE UNIV LEUVEN,IKS,LISOL,B-3001 LOUVAIN,BELGIUM. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. GEORGIA INST TECHNOL,SCH CHEM & BIOCHEM,ATLANTA,GA 30332. GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332. OAK RIDGE ASSOCIATED UNIV,UNISOR,OAK RIDGE,TN 37830. NR 47 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 5 PY 1991 VL 530 IS 2 BP 401 EP 419 DI 10.1016/0375-9474(91)90810-S PG 19 WC Physics, Nuclear SC Physics GA GB114 UT WOS:A1991GB11400009 ER PT J AU DRIGERT, MW CARPENTER, MP JANSSENS, RVF MOORE, EF AHMAD, I FERNANDEZ, PB KHOO, TL WOLFS, FLH BEARDEN, IG BENET, P DALY, PJ GARG, U REVIOL, W YE, D WYSS, R AF DRIGERT, MW CARPENTER, MP JANSSENS, RVF MOORE, EF AHMAD, I FERNANDEZ, PB KHOO, TL WOLFS, FLH BEARDEN, IG BENET, P DALY, PJ GARG, U REVIOL, W YE, D WYSS, R TI SUPERDEFORMED BANDS IN HG-189, HG-190 SO NUCLEAR PHYSICS A LA English DT Article DE GD-160(S-34, XN), E = 159,162 MEV; MEASURED E-GAMMA,I-GAMMA,GAMMA-GAMMA-COIN, DSA; HG-189, HG-190 DEDUCED LEVELS, J, PI, T1/2, ROTATIONAL BAND CHARACTERISTICS; ENRICHED TARGETS, GE DETECTORS, ARRAY OF ANTI-COMPTON SPECTROMETERS,; 4-PI BISMUTH GERMANATE BALL; CRANKED WOODS-SAXON MODEL CALCULATIONS ID HIGH-SPIN; ROTATIONAL BANDS; SHAPE ISOMERISM; NUCLEI; EXCITATIONS; ALIGNMENT; A=190 AB Experiments using the (Gd(S,xn))-Gd-160-S-34 reaction at 159 and 160 MeV have revealed two gamma-ray cascades which have properties similar to those of the previously reported superdeformed bands in the heavier Hg isotopes. These sequences have been identified as superdeformed structures in 189Hg and 190Hg. For the band in 190Hg, an average quadrupole moment Q0 = 18 +/- 3 e . b was obtained from a DSAM measurement. The data are interpreted within the cranked Woods-Saxon formalism and the rise in the dynamical moment of inertia for both bands is linked to the presence of pair correlations and quasiparticle alignments. For the 189-194Hg superdeformed bands, thevariations in the observed population intensity and in the rotational frequencies at which decay out of the bands occur are found to be consistent with the calculated change in the well depth of the superdeformed minimum with mass. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV NOTRE DAME,NOTRE DAME,IN 46556. JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. RP DRIGERT, MW (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, 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 44 TC 59 Z9 59 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 5 PY 1991 VL 530 IS 2 BP 452 EP 474 DI 10.1016/0375-9474(91)90813-L PG 23 WC Physics, Nuclear SC Physics GA GB114 UT WOS:A1991GB11400012 ER PT J AU MCGOWAN, FK JOHNSON, NR LEE, IY BAKTASH, C MCCONNELL, JW RAO, MN OSHIMA, M WELLS, JC LARABEE, A RIEDINGER, LL BENGTSSON, R XING, Z AF MCGOWAN, FK JOHNSON, NR LEE, IY BAKTASH, C MCCONNELL, JW RAO, MN OSHIMA, M WELLS, JC LARABEE, A RIEDINGER, LL BENGTSSON, R XING, Z TI TRANSITION QUADRUPOLE-MOMENTS OF HIGH-SPIN STATES IN W-172 AND THEIR IMPLICATIONS FOR THE INTERPRETATION OF BAND CROSSINGS IN THE LIGHT ISOTOPES OF W TO PT SO NUCLEAR PHYSICS A LA English DT Article DE SN-124(CR-52, 4N), W-172, E = 225 MEV; MEASURED GAMMA-GAMMA COIN, GAMMA-SPECTRA, MEASURED LIFETIMES; OF STATES BY DOPPLER-SHIFT RECOIL-DISTANCE METHOD; W-172 DEDUCED QT VALUES, IN YRAST AND NEGATIVE-PARITY BANDS, B(E1); W-172; TOTAL ROUTHIAN SURFACE CALCULATIONS, CRANKED-HFB CALCULATIONS,; DEFORMATION PARAMETERS BETA-2-BETA-4, GAMMA ID SHAPE COEXISTENCE; ALIGNMENT PROCESSES; NEUTRON-DEFICIENT; NUCLEI; YRAST; COLLECTIVITY; YB-160; OS-174 AB Lifetimes of states in W-172 have been measured by the Doppler-shift recoil-distance method using the reaction (Sn(Cr, 4n))-Sn-124-Cr-52-W-172 at a bombarding energy of 225 MeV. The data were collected in the gamma-gamma-coincidence mode rather than the customary singles mode in order to reduce the complexities of the gamma-ray spectra and to avoid some of the problems associated with side feeding to excited states. At low spin (I less-than-or-equal-to 8h) the experimental transition quadrupole moments, Q(t), are all near a constant value of 7.0 e . b. For states in the yrast band with I greater-than-or-equal-to 10 h, the experimental Q(t) values are all near a constant value of 6.8 e . b. This is the trend predicted by cranked Hartree-Fock-Bogoliubov (HFB) calculations and by the calculated systematics of triaxial shape-driving forces which originate from the aligned i13/2 neutron orbitals around N = 98. From the extensive total routhian surface (TRS) calculations in this mass region, it now seems clear that the low-lying band crossings in the light W to Pt isotopes are due to the alignment of various neutron i13/2 quasiparticle pairs and not proton h9/2 pairs. The Q(t) values of several states in the negative-parity bands are significantly smaller than those in the yrast band. Finally, a number of interband reduced E1 transition probabilities are extracted from the data. C1 TENNESSEE TECHNOL UNIV,COOKEVILLE,TN 38505. UNIV TENNESSEE,KNOXVILLE,TN 37916. LANZHOU UNIV,LANZHOU,PEOPLES R CHINA. LUND INST TECHNOL,DEPT MATH PHYS,S-22007 LUND,SWEDEN. RP MCGOWAN, FK (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 48 TC 18 Z9 18 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD AUG 5 PY 1991 VL 530 IS 2 BP 490 EP 506 DI 10.1016/0375-9474(91)90815-N PG 17 WC Physics, Nuclear SC Physics GA GB114 UT WOS:A1991GB11400014 ER PT J AU DAWSON, S AF DAWSON, S TI RADIATIVE-CORRECTIONS TO HIGGS BOSON PRODUCTION SO NUCLEAR PHYSICS B LA English DT Article ID LARGE PERTURBATIVE CORRECTIONS; GAUGE-INVARIANT OPERATORS; EFFECTIVE W APPROXIMATION; BACKGROUND-FIELD GAUGE; LOW-ENERGY THEOREMS; DRELL-YAN PROCESS; QUANTUM CHROMODYNAMICS; SUPER COLLIDER; QCD; RENORMALIZATION AB We calculate the O(alpha-s3) radiative corrections to Higgs boson production in hadronic colliders in the infinite top-quark mass limit. Our calculation is valid for energy scales and Higgs boson masses which are much less than the top-quark mass. The contributions from the gg --> HX, qqBAR --> H, qg --> qH and qgBAR --> qHBAR subprocesses are included. RP DAWSON, S (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 41 TC 530 Z9 530 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 AUG 5 PY 1991 VL 359 IS 2-3 BP 283 EP 300 DI 10.1016/0550-3213(91)90061-2 PG 18 WC Physics, Particles & Fields SC Physics GA FX020 UT WOS:A1991FX02000003 ER PT J AU ZOLOTARYUK, AV PNEVMATIKOS, S SAVIN, AV AF ZOLOTARYUK, AV PNEVMATIKOS, S SAVIN, AV TI CHARGE TRANSPORT BY SOLITONS IN HYDROGEN-BONDED MATERIALS SO PHYSICAL REVIEW LETTERS LA English DT Article ID PROTON CONDUCTION; ICE; CHAIN; BACTERIORHODOPSIN; INJECTION; INTERFACE; MECHANISM AB We discuss a possible mechanism of charge transport in hydrogen-bonded chains by protonic defects which can trap one excess electron or electron hole. C1 UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093. RES CTR CRETE,GR-71110 HERAKLION,GREECE. UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. INST PHYSICOTECH PROBLEMS,MOSCOW 119034,USSR. RP ZOLOTARYUK, AV (reprint author), ACAD SCI UKSSR,INST THEORET PHYS,KIEV 252130,UKRAINE,USSR. NR 22 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 5 PY 1991 VL 67 IS 6 BP 707 EP 710 DI 10.1103/PhysRevLett.67.707 PG 4 WC Physics, Multidisciplinary SC Physics GA FZ348 UT WOS:A1991FZ34800013 ER PT J AU MEYER, FW OVERBURY, SH HAVENER, CC VANEMMICHOVEN, PAZ ZEHNER, DM AF MEYER, FW OVERBURY, SH HAVENER, CC VANEMMICHOVEN, PAZ ZEHNER, DM TI EVIDENCE FOR ABOVE-SURFACE AND SUBSURFACE NEUTRALIZATION DURING INTERACTIONS OF HIGHLY CHARGED IONS WITH A METAL TARGET SO PHYSICAL REVIEW LETTERS LA English DT Article ID SOLIDS; ELECTRONS; ATOMS AB The projectile K Auger electron emission observed during grazing collisions of 60-keV N6+ ions with Au(110) is characterized by two components with strikingly different dependences on perpendicular velocity. A "fast" component dominates and is ascribed to "subsurface" emission. This component was satisfactorily modeled using a Monte Carlo simulation of the projectile trajectories after surface penetration. A "slow" component appears at very small angles and has a time dependence characteristic of the neutralization-deexcitation cascade predicted to occur above the surface prior to bulk penetration. RP MEYER, FW (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. RI Overbury, Steven/C-5108-2016 OI Overbury, Steven/0000-0002-5137-3961 NR 18 TC 125 Z9 127 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 5 PY 1991 VL 67 IS 6 BP 723 EP 726 DI 10.1103/PhysRevLett.67.723 PG 4 WC Physics, Multidisciplinary SC Physics GA FZ348 UT WOS:A1991FZ34800017 ER PT J AU JIA, JJ OBRIEN, WL CALLCOTT, TA DONG, QY RUBENSSON, JE MUELLER, DR EDERER, DL AF JIA, JJ OBRIEN, WL CALLCOTT, TA DONG, QY RUBENSSON, JE MUELLER, DR EDERER, DL TI SOFT-X-RAY-EMISSION SPECTRA OF SOLID KR AND XE SO PHYSICAL REVIEW LETTERS LA English DT Article ID RARE-GASES; XENON; PHOTOEMISSION; KRYPTON; BANDS; ELECTRON; VALENCE AB We present the first soft-x-ray-emission spectra for solid Kr (4p-3d) and Xe (5p-4d) that are free of complicating satellite spectra. Monochromatic synchrotron-radiation excitation is used to suppress the satellites. The data are analyzed to determine the P3/2 bandwidth for both elements; these results are compared with both photoemission data and available theoretical calculations. Bandwidths are found to be larger than those predicted by most electronic structure calculations. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. RP JIA, JJ (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 23 TC 7 Z9 7 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 5 PY 1991 VL 67 IS 6 BP 731 EP 734 DI 10.1103/PhysRevLett.67.731 PG 4 WC Physics, Multidisciplinary SC Physics GA FZ348 UT WOS:A1991FZ34800019 ER PT J AU PENNYCOOK, SJ CHISHOLM, MF JESSON, DE NORTON, DP LOWNDES, DH FEENSTRA, R KERCHNER, HR THOMSON, JO AF PENNYCOOK, SJ CHISHOLM, MF JESSON, DE NORTON, DP LOWNDES, DH FEENSTRA, R KERCHNER, HR THOMSON, JO TI INTERDIFFUSION, GROWTH MECHANISMS, AND CRITICAL CURRENTS IN YBA2CU3O7-X/PRBA2CU3O7-X SUPERLATTICES SO PHYSICAL REVIEW LETTERS LA English DT Article ID THIN-FILMS; SUPERCONDUCTORS AB Z-contrast electron microscopy demonstrates that interdiffusion is not affecting the resistive transitions observed in M x N YBa2Cu3O7-x/PrBa2Cu3O7-x superlattices. At moderate supersaturations, island growth is observed, the islands comprising one Ba-Y-Ba structural unit in height terminated at the Cu-chain plane, having sides 20-30 nm long along [100] and [010]. The associated gradual roughening of the growing surface has no apparent effect on critical currents for M greater-than-or-equal-to 2, the temperature and field dependence being comparable to that of a film. C1 UNIV TENNESSEE,DEPT PHYS & ASTRON,KNOXVILLE,TN 37996. RP PENNYCOOK, SJ (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. OI Jesson, David/0000-0003-0897-1445 NR 20 TC 76 Z9 76 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 AUG 5 PY 1991 VL 67 IS 6 BP 765 EP 768 DI 10.1103/PhysRevLett.67.765 PG 4 WC Physics, Multidisciplinary SC Physics GA FZ348 UT WOS:A1991FZ34800028 ER PT J AU MANE, SR AF MANE, SR TI AHARONOV-ANANDAN QUANTUM PHASE FOR RELATIVISTIC SPIN-POLARIZED PROTONS SO PHYSICS LETTERS A LA English DT Article ID DEPOLARIZING RESONANCES; SIBERIAN SNAKE AB Experiments at the Indiana University Cyclotron Facility have revealed an unexpected shift in the precession frequency of spin polarized protons in their cooler ring. It is considered to be a systematic error, but I suggest that it is an Aharonov-Anandan phase, and is worth investigating in more detail. RP MANE, SR (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 12 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD AUG 5 PY 1991 VL 157 IS 6-7 BP 320 EP 324 DI 10.1016/0375-9601(91)90863-4 PG 5 WC Physics, Multidisciplinary SC Physics GA GC019 UT WOS:A1991GC01900002 ER PT J AU NAGY, JO BEDNARSKI, MD AF NAGY, JO BEDNARSKI, MD TI THE CHEMICAL-ENZYMATIC SYNTHESIS OF A CARBON GLYCOSIDE OF N-ACETYL NEURAMINIC ACID SO TETRAHEDRON LETTERS LA English DT Article DE CARBON GLYCOSIDE; NEURAMINIC ACID; RADICAL COUPLING; ENZYMATIC; VIRAL INHIBITORS ID INFLUENZA-VIRUS; SIALIC-ACID; C-GLYCOSIDES; DERIVATIVES; RADICALS; GLYCOPYRANOSIDES; CHEMISTRY; BOND AB A C-glycoside of neuraminic acid (NeuAc) has been synthesized by a combined use of an enzyme catalyzed aldol reaction and a tin mediated radical coupling reaction. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. NR 32 TC 46 Z9 47 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0040-4039 J9 TETRAHEDRON LETT JI Tetrahedron Lett. PD AUG 5 PY 1991 VL 32 IS 32 BP 3953 EP 3956 DI 10.1016/0040-4039(91)80598-Z PG 4 WC Chemistry, Organic SC Chemistry GA FY855 UT WOS:A1991FY85500013 ER PT J AU ZHANG, JZH MILLER, WH WEAVER, A NEUMARK, DM AF ZHANG, JZH MILLER, WH WEAVER, A NEUMARK, DM TI QUANTUM REACTIVE SCATTERING CALCULATIONS OF FRANCK-CONDON FACTORS FOR THE PHOTODETACHMENT OF H2F- AND D2F- AND COMPARISONS WITH EXPERIMENT SO CHEMICAL PHYSICS LETTERS LA English DT Article ID POTENTIAL-ENERGY SURFACE; 3-DIMENSIONAL F+D2 REACTION; KOHN VARIATIONAL PRINCIPLE; TRANSITION-STATE REGION; INTEGRAL CROSS-SECTIONS; S-MATRIX VERSION; F+H2 REACTION; SPECTRUM; SPECTROSCOPY; F+H2->HF+H AB The nuclear Franck-Condon factor for the photodetachment processes H(D)2F- + hv --> H(D)2 + F + e-, H(D)F + H(D) + e- for J = 0 has been calculated using the S-matrix Kohn variational method for reactive scattering on the T5a potential energy surface. The positions of peaks in the spectra of our theoretical calculations are in excellent agreement with those found in the recent experiment of Weaver and Neumark. The width of the main peak in the spectrum of H2F- matches perfectly with the experimental one, but the width of the main peak for the D2F- is narrower than the experiment. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. RP ZHANG, JZH (reprint author), NYU, DEPT CHEM, NEW YORK, NY 10003 USA. RI Zhang, John/A-3372-2013 NR 35 TC 31 Z9 31 U1 0 U2 8 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 AUG 2 PY 1991 VL 182 IS 3-4 BP 283 EP 289 DI 10.1016/0009-2614(91)80216-K PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA529 UT WOS:A1991GA52900014 ER PT J AU MROZ, TH SCHULLER, WA AF MROZ, TH SCHULLER, WA TI APPLICATION OF 3-D GEOLOGICAL MAPPING TO SITE HORIZONTAL WELLS SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 US DOE,METC,MORGANTOWN,WV. EG&G,WASC,MORGANTOWN,WV. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN PETROL GEOLOGISTS PI TULSA PA 1444 S BOULDER AVE PO BOX 979, TULSA, OK 74101 SN 0149-1423 J9 AAPG BULL JI AAPG Bull.-Am. Assoc. Petr. Geol. PD AUG PY 1991 VL 75 IS 8 BP 1388 EP 1388 PG 1 WC Energy & Fuels; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA GA885 UT WOS:A1991GA88500050 ER PT J AU NEQUSDEWYS, J KIMMELL, CE HART, GF PLUM, MM AF NEQUSDEWYS, J KIMMELL, CE HART, GF PLUM, MM TI THE FEASIBILITY OF RECOVERING MEDIUM TO HEAVY OIL USING GEOPRESSURED-GEOTHERMAL FLUIDS SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 EG&G IDAHO INC,IDAHO FALLS,ID 83401. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. FANION PROD CO,SAN ANTONIO,TX. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN PETROL GEOLOGISTS PI TULSA PA 1444 S BOULDER AVE PO BOX 979, TULSA, OK 74101 SN 0149-1423 J9 AAPG BULL JI AAPG Bull.-Am. Assoc. Petr. Geol. PD AUG PY 1991 VL 75 IS 8 BP 1417 EP 1418 PG 2 WC Energy & Fuels; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA GA885 UT WOS:A1991GA88500172 ER PT J AU PRICE, CW AF PRICE, CW TI ANALYSIS OF MODELS FOR GRAIN-IMPINGEMENT COMPENSATION AND THEIR EFFECT ON RECRYSTALLIZATION KINETICS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID COMPUTER-SIMULATION; NUCLEATION; METALS; GROWTH AB Compensation for grain impingement is essential in kinetic relations for recrystallization, but impingement geometry is sufficiently complex that impingement compensation can only be approximated. Impingement compensation has been treated in two different models: the Kolmogorov-Johnson-Mehl-Avrami extended-volume concept and the empirical Speich-Fisher parabolic relation between the area of the interface that separates recrystallized and unrecrystallized material and the volume fraction of recrystallized material. Although much uncertainty has existed on the efficacy of these models, their accuracy and limitations can now be analyzed in computer simulations. The simulations reveal that both models provide reasonable impingement compensation, but their limitations must be carefully defined. In the past, deviations from predicted kinetic behavior often were attributed to approximations introduced by the impingement models, but computer simulations now reveal that limitations imposed by the time dependence used to model growth are often ignored and can be a major source of confusion. RP PRICE, CW (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB, CHEM & MAT SCI LAB, LIVERMORE, CA 94550 USA. NR 34 TC 22 Z9 24 U1 0 U2 1 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 AUG PY 1991 VL 39 IS 8 BP 1807 EP 1816 DI 10.1016/0956-7151(91)90149-U PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FY829 UT WOS:A1991FY82900009 ER PT J AU HEMKER, KJ MILLS, MJ NIX, WD AF HEMKER, KJ MILLS, MJ NIX, WD TI AN INVESTIGATION OF THE MECHANISMS THAT CONTROL INTERMEDIATE TEMPERATURE CREEP OF NI3AL SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID STEADY-STATE CREEP; SINGLE-CRYSTALS; ORDERED ALLOYS; WEAK-BEAM; DISLOCATIONS; ORIENTATION; STRESS AB In this study, constant stress creep tests were combined with detailed transmission electron microscopy in order to characterize and explain the intermediate temperature creep properties of Ni3Al. It was observed that octahedral glide, the mechanism associated with the anomalous yielding behavior of this alloy, is exhausted during primary creep. Primary creep does not lead to steady state creep but is instead followed by inverse creep. TEM observations indicate that the Kear-Wilsdorf locks that are formed during primary creep do lead to the exhaustion of octahedral glide, but that given sufficient time and temperature these cross-slipped segments are able to bow out and glide on the cube cross-slip plane. This dislocation generation, and subsequent glide, on the (010) plane is the basis for the observation of inverse creep in this alloy. Dislocation motion on the cube plane is a thermally activated process and as such is able to explain the strong temperature dependence that was observed for the intermediate temperature creep strength of Ni3Al. C1 SANDIA NATL LABS, DEPT MAT, LIVERMORE, CA 94551 USA. RP HEMKER, KJ (reprint author), STANFORD UNIV, DEPT MAT SCI & ENGN, STANFORD, CA 94305 USA. RI Hemker, Kevin/A-3315-2010 NR 35 TC 57 Z9 60 U1 1 U2 8 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 AUG PY 1991 VL 39 IS 8 BP 1901 EP 1913 DI 10.1016/0956-7151(91)90159-X PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FY829 UT WOS:A1991FY82900019 ER PT J AU KATZ, JD BLAKE, RD AF KATZ, JD BLAKE, RD TI MICROWAVE SINTERING OF MULTIPLE ALUMINA AND COMPOSITE COMPONENTS SO AMERICAN CERAMIC SOCIETY BULLETIN LA English DT Article ID CERAMICS; ENERGY RP KATZ, JD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 15 TC 50 Z9 51 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7812 J9 AM CERAM SOC BULL JI Am. Ceram. Soc. Bull. PD AUG PY 1991 VL 70 IS 8 BP 1304 EP 1308 PG 5 WC Materials Science, Ceramics SC Materials Science GA FZ698 UT WOS:A1991FZ69800009 ER PT J AU CRAIG, DK LAPIN, CA BUTTERFIELD, GE AF CRAIG, DK LAPIN, CA BUTTERFIELD, GE TI THE GENERATION AND CHARACTERIZATION OF SILICON-CARBIDE WHISKERS (FIBERS) FOR INHALATION TOXICOLOGY STUDIES SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article AB Atmospheres of silicon carbide whiskers (wh) were required for a repeated dose lung deposition study and a subchronic inhalation toxicity study, each involving exposure to three concentrations of whiskers for 6 hr/day, 5 days/week for 1 or 13 weeks. Target concentrations were 0, 500, 1500, and 7500 wh/cc. By using the mean fiber length (10 mum), diameter (0.555 mum), and density (3.2 g/cc) of the bulk material, target mass concentrations were approximately 0, 4, 12, and 60 mg/m3. The Pitt III generator, developed for cotton fiber dispersion at the University of Pittsburgh, was selected. This instrument consists of a vertical 18-in. long cylinder, which is closed at each end with rubber dams and coupled at the base to a loudspeaker. The sonic energy from the loudspeaker fluidizes the test material and the whiskers in the air column are carried out with the exhaust air. The output of the Pitt III generator was altered by changing the sound energy input, the rate of introduction of the test material into the fluidizing cylinder, or the airflow through the cylinder. Separate generation systems were used for each inhalation chamber. Chamber atmospheres were characterized gravimetrically and samples were analyzed by scanning electron microscopy. Mean mass and number concentrations for the subchronic study were 0.09, 3.93, 10.7, and 60.5 mg/m3 and 0, 630, 1746, and 7276 wh/cc, respectively. Weighted mean values for whisker diameters, lengths, and aspect ratios were 0.560 mum, 4.53 mum, and 8.62, respectively. Although whisker lengths were less than half those of the bulk material, nearly 30% of the whiskers were greater than 5 mum long. C1 ARCO,LOS ANGELES,CA 90071. SAVANNAH RIVER LABS,AIKEN,SC 29802. STATE MICHIGAN DEPT NAT RESOURCES,LANSING,MI 48909. NR 12 TC 2 Z9 2 U1 0 U2 0 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD AUG PY 1991 VL 52 IS 8 BP 315 EP 319 PG 5 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA KC588 UT WOS:A1991KC58800004 PM 1927908 ER PT J AU MILONNI, PW SHIH, ML AF MILONNI, PW SHIH, ML TI ZERO-POINT ENERGY IN EARLY QUANTUM-THEORY SO AMERICAN JOURNAL OF PHYSICS LA English DT Article ID EMISSION AB In modern physics the vacuum is not a tranquil void but a quantum state with fluctuations having observable consequences. The present concept of the vacuum has its roots in the zero-point energy of harmonic oscillators and the electromagnetic field, and arose before the development of the formalism of quantum mechanics. This article discusses these roots in the blackbody research of Planck and Einstein in 1912-1913, and the relation to Bose-Einstein statistics and the first indication of wave-particle duality uncovered by Einstein's fluctuation formula. Also considered are the Einstein-Stern theory of specific heats, which invoked zero-point energy in a way which turned out to be incorrect, and the experimental implications of zero-point energy recognized by Mulliken and Debye in vibrational spectroscopy and x-ray diffraction. RP MILONNI, PW (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,MAIL STOP B-212,LOS ALAMOS,NM 87545, USA. NR 27 TC 18 Z9 18 U1 3 U2 6 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 AUG PY 1991 VL 59 IS 8 BP 684 EP 698 DI 10.1119/1.16772 PG 15 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA FY836 UT WOS:A1991FY83600006 ER PT J AU HEYMSFIELD, SB WAKI, M KEHAYIAS, J LICHTMAN, S DILMANIAN, FA KAMEN, Y WANG, J PIERSON, RN AF HEYMSFIELD, SB WAKI, M KEHAYIAS, J LICHTMAN, S DILMANIAN, FA KAMEN, Y WANG, J PIERSON, RN TI CHEMICAL AND ELEMENTAL ANALYSIS OF HUMANS INVIVO USING IMPROVED BODY-COMPOSITION MODELS SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Article DE NEUTRON-ACTIVATION ANALYSIS; NUTRITIONAL ASSESSMENT ID NEUTRON-ACTIVATION; FAT AB Six chemical compartments [water, protein, mineral (osseus and cellular), glycogen, and fat] consisting of 11 elements (N, C, Ca, Na, Cl, K, H, P, O, S, and Mg) comprise greater-than-or-equal-to 99% of body weight in living humans. The combination of three neutron-activation systems, whole body K-40 counting, and (H2O)-H-3 dilution at Brookhaven National Laboratory now potentially makes it possible to quantify greater-than-or-equal-to 96% of the chemical and elemental determinants of body weight in vivo. The aims of the present study were 1) to develop 6- and 11-compartment chemical and elemental models, respectively, and 2) to evaluate these models in a group of 20 healthy adults. Results demonstrated that body weight estimated from either chemical or elemental components was highly correlated with (both r = 0.97, P < 0.001) and on average differed by < 4% from actual body weight. The compartmental results obtained using the chemical model were also evaluated by comparing calculated and actual body density (D(b)) estimated by under-water weighing. Calculated D(b) [1.041 +/- 0.017 (SD) g/ml] agreed closely and was highly correlated with actual D(b) (1.039 +/- 0.018 g/ml; r = 0.82; P < 0.001). Hence a near-complete chemical and elemental analysis of living human subjects is now possible and, with potential future refinements, represents an important opportunity to quantify the effects of gender, aging, and ethnic status on body composition. C1 BROOKHAVEN NATL LAB,MED PHYS GRP,UPTON,NY 11973. TUFTS UNIV,USDA,HUMAN NUTR RES CTR AGING,BOSTON,MA 02111. RP HEYMSFIELD, SB (reprint author), COLUMBIA UNIV,ST LUKES ROOSEVELT HOSP,COLL PHYS & SURG,OBES RES CTR,DEPT MED,NEW YORK,NY 10025, USA. FU NIDDK NIH HHS [P01-DK-42818] NR 36 TC 46 Z9 46 U1 0 U2 6 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD AUG PY 1991 VL 261 IS 2 BP E190 EP E198 PN 1 PG 9 WC Physiology SC Physiology GA GC251 UT WOS:A1991GC25100029 PM 1872381 ER PT J AU NEWCOMB, WA AF NEWCOMB, WA TI INSCRIPTIBLE POLYGONS SO AMERICAN MATHEMATICAL MONTHLY LA English DT Letter RP NEWCOMB, WA (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MATHEMATICAL ASSOC AMER PI WASHINGTON PA 1529 18TH STREET NW, WASHINGTON, DC 20036 SN 0002-9890 J9 AM MATH MON JI Am. Math. Mon. PD AUG-SEP PY 1991 VL 98 IS 7 BP 656 EP 659 PG 4 WC Mathematics SC Mathematics GA GC241 UT WOS:A1991GC24100018 ER PT J AU PIEPEL, G AF PIEPEL, G TI ON REGRESSION PROCEDURES IN SAS - REPLY SO AMERICAN STATISTICIAN LA English DT Letter RP PIEPEL, G (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER STATIST ASSN PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0003-1305 J9 AM STAT JI Am. Stat. PD AUG PY 1991 VL 45 IS 3 BP 261 EP 262 PG 2 WC Statistics & Probability SC Mathematics GA FY393 UT WOS:A1991FY39300035 ER PT J AU WIEDERIN, DR SMYCZEK, RE HOUK, RS AF WIEDERIN, DR SMYCZEK, RE HOUK, RS TI ONLINE STANDARD ADDITIONS WITH DIRECT INJECTION NEBULIZATION FOR INDUCTIVELY COUPLED PLASMA MASS-SPECTROMETRY SO ANALYTICAL CHEMISTRY LA English DT Article ID ISOTOPE-DILUTION ANALYSIS; FLOW-INJECTION; MARINE-SEDIMENTS; SAMPLES; METALS AB A flow injection method for on-line standard additions is described. A 500-mu-L sample solution is injected into a flowing stream via a metal-free flow injection valve. Standard solutions (50-mu-L) are sequentially introduced through a second valve. The two streams mix in a PEEK tee before they are nebulized into the ICP. The advantages of the method of standard additions for matrix correction are retained, but the time-consuming solution preparation steps for conventional standard additions are eliminated by using flow injection techniques and a direct injection nebulizer. Nine toxic elements in undiluted urine were determined in less than 5 min. Possible effects of sample viscosity on accuracy are investigated. Evidence for a change in the background when seawater is nebulized is also presented. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 28 TC 52 Z9 52 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 AUG 1 PY 1991 VL 63 IS 15 BP 1626 EP 1631 DI 10.1021/ac00015a024 PG 6 WC Chemistry, Analytical SC Chemistry GA FY568 UT WOS:A1991FY56800026 ER PT J AU BOESE, R RODRIGUEZ, J VOLLHARDT, KPC AF BOESE, R RODRIGUEZ, J VOLLHARDT, KPC TI CHEMOSELECTIVE AND STEREOSELECTIVE COBALT-MEDIATED [2+2+2]CYCLOADDITION OF ALKYNES WITH URACIL DERIVATIVES - A NOVEL SYNTHETIC ENTRY TO MODIFIED NUCLEOSIDES SO ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; PYRIMIDINE NUCLEOSIDES; CONFORMATIONS; PROTON; SYN AB The incorporation of the 5,6 double bond of uracil derivatives in the [2+2+2] cyclization with triple bonds-whether those of alkyne substituents on a heterocycle or those of free alkynes-was accomplished by the proven CpCo route, even though the analogous reaction with other heterocycles had failed earlier. Reaction of 1 with 2 to give 3 reveals interesting possibilities, especially with respect to the synthesis of new active substances (R1 = H, CH3; R2 = CH3; sugar moiety, n = 1-3). C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP BOESE, R (reprint author), UNIV ESSEN GESAMTHSCH,INST ANORGAN CHEM,W-4300 ESSEN 1,GERMANY. NR 25 TC 19 Z9 19 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 AUG PY 1991 VL 30 IS 8 BP 993 EP 994 DI 10.1002/anie.199109931 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA GC847 UT WOS:A1991GC84700024 ER PT J AU JACOBSON, AR MASSEY, RS ERICKSON, WC AF JACOBSON, AR MASSEY, RS ERICKSON, WC TI A STUDY OF TRANSIONOSPHERIC REFRACTION OF RADIO-WAVES USING THE CLARK LAKE RADIO OBSERVATORY SO ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES LA English DT Article ID ATMOSPHERIC GRAVITY-WAVES; IONOSPHERE; INTERFEROMETRY AB The Clark Lake Radio Observatory, viewing four exceptionally strong, quasi-point celestial sources at 50 MHz, has been used to perform systematic, around-the-clock observations of transionospheric radio refraction during a 17-day campaign in February/March 1987. These data complement those gathered elsewhere, by concentrating on raypaths near and poleward of zenith. We observe average (rms fluctuating) transverse slant total electron content gradients which are weaker, by factors of 2 to > 10, than those observed at other facilities sited further poleward and viewing sources located further equatorward. The frequently observed quasiperiodic oscillations are clustered in the frequency range f less-than-or-equal-to 2 mHz. We do not see the expected suppression of refractive activity in this band during the night, despite the nocturnal reduction of ionospheric density. C1 UNIV MARYLAND,ASTRON PROGRAM,COLLEGE PK,MD 20742. RP JACOBSON, AR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV SPACE SCI & TECHNOL,ATMOSPHER SCI GRP,MAIL STOP D466,LOS ALAMOS,NM 87545, USA. NR 14 TC 8 Z9 8 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0992-7689 J9 ANN GEOPHYS JI Ann. Geophys.-Atmos. Hydrospheres Space Sci. PD AUG PY 1991 VL 9 IS 8 BP 546 EP 552 PG 7 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA GC452 UT WOS:A1991GC45200006 ER PT J AU WANG, SJ LI, BA BAUER, W RANDRUP, J AF WANG, SJ LI, BA BAUER, W RANDRUP, J TI RELATIVISTIC TRANSPORT-THEORY FOR HADRONIC MATTER SO ANNALS OF PHYSICS LA English DT Article ID HEAVY-ION COLLISIONS; NUCLEUS-NUCLEUS COLLISIONS; DENSITY-MATRIX FORMALISM; PION-PRODUCTION; VLASOV EQUATION; STATE; EQUILIBRATION; MODES C1 LANZHOU UNIV,DEPT MODERN PHYS,LANZHOU 730001,PEOPLES R CHINA. CHINESE CTR AD SCI & TECHNOL,WORLD LAB,CTR THEORET PHYS,BEIJING,PEOPLES R CHINA. MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. RP WANG, SJ (reprint author), MICHIGAN STATE UNIV,NATL SUPERCOND CYCLOTRON LAB,E LANSING,MI 48824, USA. NR 56 TC 47 Z9 52 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD AUG 1 PY 1991 VL 209 IS 2 BP 251 EP 305 DI 10.1016/0003-4916(91)90031-3 PG 55 WC Physics, Multidisciplinary SC Physics GA FX076 UT WOS:A1991FX07600001 ER PT J AU BERTSCH, GF ESBENSEN, H AF BERTSCH, GF ESBENSEN, H TI PAIR CORRELATIONS NEAR THE NEUTRON DRIP LINE SO ANNALS OF PHYSICS LA English DT Article ID LIGHT-NUCLEI; ENERGY-LEVELS; LI-11; COULOMB; MODEL C1 ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP BERTSCH, GF (reprint author), MICHIGAN STATE UNIV,CYCLOTRON LAB,E LANSING,MI 48824, USA. NR 23 TC 374 Z9 382 U1 0 U2 6 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD AUG 1 PY 1991 VL 209 IS 2 BP 327 EP 363 DI 10.1016/0003-4916(91)90033-5 PG 37 WC Physics, Multidisciplinary SC Physics GA FX076 UT WOS:A1991FX07600003 ER PT J AU ADNEY, WS RIVARD, CJ SHIANG, M HIMMEL, ME AF ADNEY, WS RIVARD, CJ SHIANG, M HIMMEL, ME TI ANAEROBIC-DIGESTION OF LIGNOCELLULOSIC BIOMASS AND WASTES - CELLULASES AND RELATED ENZYMES SO APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY LA English DT Review DE ANAEROBIC DIGESTION; CELLULASE; BIOMASS CONVERSION; METHANE PRODUCTION ID FLUORESCENS VAR. CELLULOSA; MUNICIPAL SOLID-WASTE; PLANT-CELL WALLS; CLOSTRIDIUM-THERMOCELLUM; ACETIVIBRIO-CELLULOLYTICUS; RUMINOCOCCUS-ALBUS; BACTEROIDES-SUCCINOGENES; SP-NOV; MICROCRYSTALLINE CELLULOSE; 3-PHENYLPROPANOIC ACID AB Anaerobic digestion represents one of several commercially viable processes to convert woody biomass, agricultural wastes, and municipal solid wastes to methane gas, a useful energy source. This process occurs in the absence of oxygen, and is substantially less energy intensive than aerobic biological processes designed for disposal purposes. The anaerobic conversion process is a result of the synergistic effects of various microorganisms, which serve as a consortium. The rate-limiting step of this conversion process has been identified as the hydrolysis of cellulose, the major polymeric component of most biomass and waste feedstocks. Improvements in process economics therefore rely on improving the kinetic and physicochemical characteristics of cellulose degrading enzymes. The most thoroughly studied cellulase enzymes are produced by aerobic fungi, namely Trichoderma reesei. However, the pH and temperature optima of fungal cellulases make them incompatible for use in anaerobic digestion systems, and the major populations of microorganisms involved in cellulase enzyme production under anaerobic digestion conditions are various bacterial producers. The current state of understanding of the major groups of bacterial cellulase producers is reviewed in this paper. Also addressed in this review are recently developed methods for the assessment of actual cellulase activity levels, reflective of the digester "hydrolytic potential," using a series of detergent extractive procedures. C1 SOLAR ENERGY RES INST,DIV SOLAR FUELS RES,BIOTECHNOL RES BRANCH,APPL BIOL SCI SECT,GOLDEN,CO 80401. NR 122 TC 33 Z9 33 U1 4 U2 40 PU HUMANA PRESS INC PI TOTOWA PA 999 RIVERVIEW DRIVE SUITE 208, TOTOWA, NJ 07512 SN 0273-2289 J9 APPL BIOCHEM BIOTECH JI Appl. Biochem. Biotechnol. PD AUG PY 1991 VL 30 IS 2 BP 165 EP 183 DI 10.1007/BF02921684 PG 19 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA GD778 UT WOS:A1991GD77800006 PM 1952931 ER PT J AU LILIENTALWEBER, Z CLAVERIE, A WASHBURN, J SMITH, F CALAWA, R AF LILIENTALWEBER, Z CLAVERIE, A WASHBURN, J SMITH, F CALAWA, R TI MICROSTRUCTURE OF ANNEALED LOW-TEMPERATURE-GROWN GAAS-LAYERS SO APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING LA English DT Article ID MOLECULAR-BEAM EPITAXY AB The crystal structure and orientation of As precipitates in annealed low-temperature GaAs (LT-GaAs) layers have been investigated by transmission electron microscopy. Three types of As precipitates were identified in layers grown by molecular beam epitaxy at substrate temperatures from 180-degrees to 210-degrees-C. In the monocrystalline LT-GaAs layers small "pseudocubic" As precipitates (2-3 nm diameter) coherent with the GaAs lattice were observed. These precipitates lose their coherency when a certain critical size is exceeded. Precipitates of similar sizes are occasionally found for which a TEM lattice image cannot be obtained. These precipitates are believed to be amorphous. Larger As precipitates with a hexagonal structure (> 4 nm diameter) were also found in the layers. These hexagonal As precipitates were observed to be largest near structural defects. The effect of these precipitates on the structure and on the electronic properties of the host GaAs is discussed. C1 MIT,LINCOLN LAB,LEXINGTON,MA 02173. CNRS,CEMES,F-31055 TOULOUSE,FRANCE. RP LILIENTALWEBER, Z (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Schaff, William/B-5839-2009; Liliental-Weber, Zuzanna/H-8006-2012 NR 15 TC 49 Z9 49 U1 0 U2 5 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0947-8396 J9 APPL PHYS A-MATER JI Appl. Phys. A-Mater. Sci. Process. PD AUG PY 1991 VL 53 IS 2 BP 141 EP 146 DI 10.1007/BF00323874 PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA FW288 UT WOS:A1991FW28800009 ER PT J AU WEEKS, SJ GILLES, SM DSILVA, AP AF WEEKS, SJ GILLES, SM DSILVA, AP TI DETECTION OF BENZO[A]PYRENE METABOLITES BY LASER-EXCITED SHPOLSKII SPECTROMETRY SO APPLIED SPECTROSCOPY LA English DT Article DE POLYCYCLIC AROMATIC HYDROCARBONS; MOLECULAR FLUORESCENCE; SHPOLSKII SPECTROMETRY ID POLYCYCLIC AROMATIC-HYDROCARBONS; DERIVATIZATION AB Chemical carcinogenesis studies mandate isomer-selective detection at ultratrace levels of the metabolites of polycyclic aromatic compounds (PACs). The formation of hydroxy PACs is a key step in the metabolic process, particularly detoxification, for PACs in mammals. The infamous carcinogen benzo[a]pyrene (B[a]P) and its metabolites are often used as marker compounds to assess human exposure to total PACs and to study the development of cancer. In this work, isomers related to two alternative metabolic pathways for B[a]P have been selectively detected from urine and blood sera samples by laser-excited Shpol'skii spectrometry (LESS). The polar metabolites are derivatized and extracted into the n-alkane Shpol'skii solvent for direct, trace-level, isomer-selective detection. An absolute detection limit for 9-methoxy B[a]P was 50 attomole for a 20-mu-L sample. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 15 TC 12 Z9 12 U1 0 U2 2 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD AUG PY 1991 VL 45 IS 7 BP 1093 EP 1100 DI 10.1366/0003702914336066 PG 8 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA GD163 UT WOS:A1991GD16300006 ER PT J AU XI, XB YEUNG, ES AF XI, XB YEUNG, ES TI AXIAL-BEAM ABSORPTION DETECTION FOR CAPILLARY ELECTROPHORESIS WITH A CONVENTIONAL LIGHT-SOURCE SO APPLIED SPECTROSCOPY LA English DT Article DE INSTRUMENTATION; LASERS; OPTICS; SPECTROSCOPIC TECHNIQUES ID HIGH-PERFORMANCE ELECTROPHORESIS; ZONE ELECTROPHORESIS; LIQUID-CHROMATOGRAPHY; MASS-SPECTROMETRY; FLUORESCENCE AB A commercial absorption detector was modified to provide axial-beam absorption detection for capillary electrophoresis. The increased path-length led to improved detection limits. By the use of a nonaqueous solvent, the column is made into an optical waveguide for highly efficient light transmission. The electropherogram integrates the absorbance produced by all components in the sample, but provides information identical to that from normal electropherograms. The mechanical modifications make it possible to switch readily between the cross-beam and the axial-beam geometries. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. NR 30 TC 33 Z9 36 U1 0 U2 0 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD AUG PY 1991 VL 45 IS 7 BP 1199 EP 1203 DI 10.1366/0003702914335931 PG 5 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA GD163 UT WOS:A1991GD16300023 ER PT J AU LEE, TC BLANK, ML FITZGERALD, V SNYDER, F AF LEE, TC BLANK, ML FITZGERALD, V SNYDER, F TI ACYLATION OF ALKYLLYSOPHOSPHOLIPIDS BY FISCHER SARCOMA MICROSOMES SO ARCHIVES OF BIOCHEMISTRY AND BIOPHYSICS LA English DT Article ID PLATELET-ACTIVATING FACTOR; RAT-BRAIN MICROSOMES; GUINEA-PIG HEART; ARACHIDONIC-ACID; MACROPHAGE MICROSOMES; DOCOSAHEXAENOIC ACID; INDEPENDENT TRANSFER; ACYL TRANSFER; TRANSACYLATION; PHOSPHOLIPIDS RP LEE, TC (reprint author), OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,POB 117,OAK RIDGE,TN 37831, USA. FU NCI NIH HHS [CA-41642-05] NR 34 TC 4 Z9 4 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-9861 J9 ARCH BIOCHEM BIOPHYS JI Arch. Biochem. Biophys. PD AUG 1 PY 1991 VL 288 IS 2 BP 600 EP 608 DI 10.1016/0003-9861(91)90242-B PG 9 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FV096 UT WOS:A1991FV09600043 PM 1898052 ER PT J AU GLASS, LR EASTERLY, CE JONES, TD WALSH, PJ AF GLASS, LR EASTERLY, CE JONES, TD WALSH, PJ TI RANKING OF CARCINOGENIC POTENCY USING A RELATIVE POTENCY APPROACH SO ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY LA English DT Article ID RISK AB Protocols for long-term carcinogen bioassays have become highly refined. The ability to interpret these bioassay results beyond the experimental setting, however, has not improved commensurately. As a consequence, society is still faced with the fact that data derived in these bioassays reflect highly specific experimental conditions which are vastly different from environmental exposures of the freely roaming, outbred human. The scientific community has responded with a "collective wisdom" approach by using expert committees to interpret bioassay evidence. This committee approach is believed to be successful in protecting human health, but the list of suspected carcinogens is growing faster than the expert committees can respond. We have developed a relative potency framework for ranking the hazards represented by potential human carcinogens. The results demonstrate a rank ordering of a variety of compounds which is independent of the reference compound used to standardize the information. The philosophic basis of the approach may facilitate expert risk assessment systems development because it: (1) complements and supports "expert committee" data selection; (2) has a simple set of rules and does not require mathematical modeling; (3) requires no special situation judgments; and (4) is suitable for use with electronic data bases. C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,POB 2008,OAK RIDGE,TN 37831. NR 33 TC 10 Z9 10 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0090-4341 J9 ARCH ENVIRON CON TOX JI Arch. Environ. Contam. Toxicol. PD AUG PY 1991 VL 21 IS 2 BP 169 EP 176 PG 8 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA FW794 UT WOS:A1991FW79400002 PM 1958072 ER PT J AU MCCARTHY, PJ VANBREUGEL, W KAPAHI, VK SUBRAHMANYA, CR AF MCCARTHY, PJ VANBREUGEL, W KAPAHI, VK SUBRAHMANYA, CR TI HIGH REDSHIFT RADIO GALAXIES FROM THE MOLONGLO CATALOG .2. SO ASTRONOMICAL JOURNAL LA English DT Article ID OPTICAL IDENTIFICATIONS; SAMPLE; 1-JY; MAPS AB We report further results from our ongoing study of radio galaxies from the Molonglo Reference Catalogue. The sources were selected to have 408 MHz flux densities greater than 0.95 Jy and low frequency spectral indices steeper than -0.9. VLA 6 cm maps, optical identifications and redshifts for 18 sources are presented. Most of these sources are identified with faint galaxies, many of which have extended optical structures with morphologies characteristic of high redshift (z > 1) radio galaxies. Long slit spectroscopic observations have yielded redshifts for all of the galaxies, three of which have z > 2. Spectrophotometry of 1 Jy and the 3CR samples are used to distinguish between an L (emission line) versus L (radio) correlation as opposed to an L (emission line) versus redshift correlation. Our results strongly support an intrinsic L (emission line) versus L (radio) correlation. The structure of the sources in this, and other 1 Jy samples, are substantially different from the 3C sources, the 1 Jy galaxies having stronger cores and jets. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,INST GEOPHYS & PLANETARY PHYS,LIVERMORE,CA 94550. UNIV POONA,TATA INST FUNDAMENTAL RES,NATL CTR RADIO ASTRON,POONA 411007,MAHARASHTRA,INDIA. RP MCCARTHY, PJ (reprint author), CARNEGIE INST WASHINGTON,OBSERV,813 SANTA BARBARA ST,PASADENA,CA 91101, USA. RI Subramanya, C/D-4898-2012; Astronomy & Astrophysics Group, Raman Res Institute/D-4046-2012 NR 25 TC 56 Z9 56 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 1991 VL 102 IS 2 BP 522 EP 536 DI 10.1086/115891 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY255 UT WOS:A1991FY25500008 ER PT J AU VELUSAMY, T BECKER, RH SEWARD, FD AF VELUSAMY, T BECKER, RH SEWARD, FD TI G33.6+0.1 - A SHELL TYPE SUPERNOVA REMNANT WITH UNUSUAL STRUCTURE SO ASTRONOMICAL JOURNAL LA English DT Article ID X-RAY OBSERVATIONS; NOVA REMNANTS; RADIO AB The morphology of Supernova Remnant G33.6 + 0.1 (Kes 79) has been studied in the x rays with Einstein and in the radio wavelengths using the VLA. Multifrequency high resolution observations of the VLA at 327, 1500, and 5000 MHz are used to study the radio spectrum and polarization. The radio emission shows well formed outer shell structure and very bright central emission. Although the overall distribution of spectral index (approximately -0.6 to -0.75) is consistent with that of shell type remnants, the bright filamentary emission along the "inner ring" has relatively flatter spectrum (alpha approximately -0.4). Both radio and x rays show strong central emission; existence of a plerion near the center cannot be ruled out. The x-ray image does not show the characteristic limb brightening for shell type SNRs. The x ray and radio morphology may be understood in terms of very thick shell and the bright central emission as due to reverse shock. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,IGPP,LIVERMORE,CA 94550. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP VELUSAMY, T (reprint author), TIFR,CTR RADIO ASTRON,POST BOX 8,UDHAGAMANDALAM 643001,INDIA. NR 20 TC 19 Z9 19 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 1991 VL 102 IS 2 BP 676 EP 682 DI 10.1086/115901 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY255 UT WOS:A1991FY25500018 ER PT J AU HILLS, JG AF HILLS, JG TI COMPUTER-SIMULATIONS OF ENCOUNTERS BETWEEN MASSIVE BLACK-HOLES AND BINARIES SO ASTRONOMICAL JOURNAL LA English DT Article ID HARD BINARIES; STARS AB We simulated over 8 x 10(5) encounters of binaries with black holes having masses that range from 10 to 10(4) times that of the binary components. We made the calculations at many collision velocities and impact parameters, which allowed us to find the velocity-dependent cross sections for exchange collisions, for binary dissociation, and for changing the orbital energy and eccentricity. We also found the distribution of closest approaches of the stars to the black hole. We determined the probability of the black hole tidally disrupting a star in the close encounters that produce exchange collisions. Exchange collisions dominate over tidal dissociation if the sum of the radii of the stars is less than the binary semimajor axis. Even encounters of black holes with soft binaries can lead to exchange collisions in which the black hole captures one binary component and ejects the other at high speed. RP HILLS, JG (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 11 TC 47 Z9 48 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 1991 VL 102 IS 2 BP 704 EP 715 DI 10.1086/115905 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY255 UT WOS:A1991FY25500022 ER PT J AU MALINIE, G HARTMANN, DH MATHEWS, GJ AF MALINIE, G HARTMANN, DH MATHEWS, GJ TI INHOMOGENEOUS HALO COLLAPSE AND EARLY GALACTIC CHEMICAL EVOLUTION - GLOBULAR-CLUSTER METALLICITIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE CLUSTERS, GLOBULAR; GALAXIES, EVOLUTION; NUCLEOSYNTHESIS; STARS, ABUNDANCES ID MAIN-SEQUENCE; DARK MATTER; STARS; GALAXIES; DISK; ABUNDANCE; ORIGIN; OXYGEN; GIANTS; SYSTEM AB We propose a new solution to the observed Galactic globular cluster metallicity distribution by considering inhomogeneous collapse of a centrally condensed proto-Galaxy. In contrast to the standard one-zone model, we show that for inhomogeneous models the metallicity distribution can be reproduced without the need to decrease the nucleosynthetic yield for metal-poor stars. Chemical evolution in free fall is calculated analytically, and we have developed a hybrid hydro-particle code to study the effect of supernova induced pressure. RP MALINIE, G (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94551, USA. NR 59 TC 11 Z9 11 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 1991 VL 376 IS 2 BP 520 EP 530 DI 10.1086/170301 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY359 UT WOS:A1991FY35900014 ER PT J AU FULLER, GM MEYER, BS AF FULLER, GM MEYER, BS TI HIGH-TEMPERATURE NEUTRINO-NUCLEUS PROCESSES IN STELLAR COLLAPSE SO ASTROPHYSICAL JOURNAL LA English DT Article DE NEUTRINOS; NUCLEAR REACTIONS; STARS, COLLAPSED; STARS, SUPERNOVAE ID GRAVITATIONAL COLLAPSE; SUPERNOVA AB We investigate neutral current neutrino-nucleus interactions of interest in the supernova problem: endothermic and exothermic inelastic neutrino scattering processes; de-excitation of hot nuclei into neutrino pairs; and neutrino-antineutrino annihilation processes involving nuclei. We employ a shell model based treatment including allowed and forbidden transitions to compute the relevant weak strength distributions in nuclei. We discuss Fermi gas fitting formulae for the differential cross sections of all four processes for use in numerical stellar collapse calculations. Since target nuclei in stellar collapse are expected to be in highly excited states we explicitly include thermal effects in our calculations. We find that low-energy neutrino-pair production from hot nuclei and exothermic neutrino-nucleus scattering may have an important role in determining the evolution of the lepton distribution functions in the infalling presupernova core. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB, INST GEOPHYS & PLANETARY PHYS, LIVERMORE, CA 94550 USA. UNIV WASHINGTON, INST NUCL THEORY, SEATTLE, WA 98195 USA. NR 22 TC 41 Z9 41 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 1991 VL 376 IS 2 BP 701 EP 716 DI 10.1086/170317 PN 1 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY359 UT WOS:A1991FY35900030 ER PT J AU SIMON, NR COX, AN AF SIMON, NR COX, AN TI THE RRD MASSES REVISITED SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, INTERIORS; STARS, PULSATION; STARS, RR LYRAE ID LYRAE STARS; OPACITIES AB We reexamine the RRd mass determination using both new and previously existing linear pulsation models. Our conclusion is that the weight of evidence remains strongly with the "canonical" values (0.55 M. for Oosterhoff I clusters and 0.65 M. for Oosterhoff II clusters), unless the Population II metal opacities turn out to be very high. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP SIMON, NR (reprint author), UNIV NEBRASKA,DEPT PHYS & ASTRON,LINCOLN,NE 68588, USA. NR 18 TC 9 Z9 9 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 1991 VL 376 IS 2 BP 717 EP 720 DI 10.1086/170318 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY359 UT WOS:A1991FY35900031 ER PT J AU LIANG, EP WANDEL, A AF LIANG, EP WANDEL, A TI LUMINOSITY LIMIT FOR ALPHA-VISCOSITY ACCRETION DISKS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION; BLACK HOLES; HYDRODYNAMICS ID BLACK-HOLES; BINARY-SYSTEMS; CYGNUS X-1; INSTABILITY; VARIABILITY; SPECTRUM AB We report the existence of a luminosity limit for alpha-viscosity physically thin accretion disks around black holes, using a new formulation of the radiation equation bridging optically thick and thin regimes. For alpha-close to unity this limit can be lower than the Eddington limit. Physically this limit is due to the combined effects of gas and radiation pressure which become too large to satisfy vertical hydrostatic balance at intermediate optical depths for sufficiently high luminosities. This effect was overlooked in previous treatment using only the optically thin or thick limits of the radiative equation. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. STANFORD UNIV,STANFORD,CA 94305. WEIZMANN INST SCI,IL-76100 REHOVOT,ISRAEL. NR 20 TC 17 Z9 17 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD AUG 1 PY 1991 VL 376 IS 2 BP 746 EP 749 DI 10.1086/170321 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY359 UT WOS:A1991FY35900034 ER PT J AU MILDER, SJ AF MILDER, SJ TI CORRELATION BETWEEN ABSORPTION MAXIMA AND THERMAL-ISOMERIZATION RATES IN BACTERIORHODOPSIN SO BIOPHYSICAL JOURNAL LA English DT Article ID ADAPTED PURPLE MEMBRANE; DRIVEN PROTON PUMP; SCHIFF-BASE; RESONANCE RAMAN; HALOBACTERIUM-HALOBIUM; CHROMOPHORE STRUCTURE; ASPARTIC ACID-96; SPECTROSCOPY; MECHANISM; MODEL AB The reported rates of thermal 13-cis to all-trans isomerization of the protonated Schiff base of retinal (PSBR) in solution and in bacteriorhodopsin (BR) are shown to be correlated with the red shift in the absorption maximum of the chromophore, though the linear fit is different for BR and for a model PSBR in solution. Because the red shift in the absorption has been previously shown to be correlated with pi-electron delocalization in the chromophore, this suggests that the thermal isomerization rate is largely regulated by the amount of double bond character in the chromophore. Because the linear fit of isomerization rates with absorption maxima is different for BR and the model PSBR, specific interactions of the protein with the chromophore must also be a factor in determining thermal isomerization rates in BR. A model of the later steps in the photocycle of BR is presented in which the 13-cis to all-trans thermal isomerization occurs during the O intermediate. RP MILDER, SJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 43 TC 14 Z9 14 U1 0 U2 1 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD AUG PY 1991 VL 60 IS 2 BP 440 EP 446 PG 7 WC Biophysics SC Biophysics GA FY762 UT WOS:A1991FY76200017 PM 19431800 ER PT J AU SHIANG, M LINDEN, JC MOHAGHEGHI, A TUCKER, MP GROHMANN, K HIMMEL, ME AF SHIANG, M LINDEN, JC MOHAGHEGHI, A TUCKER, MP GROHMANN, K HIMMEL, ME TI CELLULASE PRODUCTION BY ACIDOTHERMUS-CELLULOLYTICUS - GROWTH ON SOLKA FLOC CELLULOSE AND SIMPLE SUGAR MIXTURES SO BIOTECHNOLOGY AND APPLIED BIOCHEMISTRY LA English DT Article ID THERMOSTABLE CELLULASES; THERMOPHILIC BACTERIA; THERMOMONOSPORA-FUSCA; CATABOLITE REPRESSION; INDUCTION C1 SOLAR ENERGY RES INST,DIV SOLAR FUELS RES,BIOTECHNOL RES BRANCH,APPL BIOL SCI SECT,GOLDEN,CO 80401. COLORADO STATE UNIV,DEPT MICROBIOL,FT COLLINS,CO 80523. COLORADO STATE UNIV,DEPT AGR & CHEM ENGN,FT COLLINS,CO 80523. NR 27 TC 1 Z9 1 U1 0 U2 3 PU PORTLAND PRESS PI LONDON PA 59 PORTLAND PLACE, LONDON, ENGLAND W1N 3AJ SN 0885-4513 J9 BIOTECHNOL APPL BIOC JI Biotechnol. Appl. Biochem. PD AUG PY 1991 VL 14 IS 1 BP 30 EP 40 PG 11 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology GA FY585 UT WOS:A1991FY58500004 ER PT J AU SLATKIN, DN AF SLATKIN, DN TI A HISTORY OF BORON NEUTRON-CAPTURE THERAPY OF BRAIN-TUMORS - POSTULATION OF A BRAIN RADIATION-DOSE TOLERANCE LIMIT SO BRAIN LA English DT Article ID B-10(N,ALPHA)LI-7 REACTION; MICE; MELANOMA; CANCER; TUMORS AB Boron neutron capture therapy (BNCT) is a form of radiation therapy mediated by the short-range (less than 10-mu-m) energetic alpha (He-4) and lithium-7 (Li-7) ionizing particles that result from the prompt disintegration by slow neutrons of the stable (nonradioactive) nucleus boron-10 (B-10). Recent advances in radiobiological and toxicological evaluation of tumour-affinitive boron-containing drugs and in optimization of the energies of neutrons in the incident beam have spurred interest in BNCT. This article presents a history of BNCT that emphasizes studies in the USA. A new dosimetric analysis of the 1959-1961 clinical trials of BNCT at Brookhaven National Laboratory is also presented. This analysis yields an acute radiation dose tolerance limit estimate of approximately 10 Gy-Eq to the capillary endothelium of human basal ganglia from BNCT. (Gy-Eq: Gray-equivalent, or relative biological effectiveness of a radiation component multiplied by the physical dose of the component (Gy), summed over the component kinds of radiation.) RP SLATKIN, DN (reprint author), BROOKHAVEN NATL LAB,MED RES CTR,UPTON,NY 11973, USA. NR 101 TC 123 Z9 123 U1 0 U2 6 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0006-8950 J9 BRAIN JI Brain PD AUG PY 1991 VL 114 BP 1609 EP 1629 DI 10.1093/brain/114.4.1609 PN 4 PG 21 WC Clinical Neurology; Neurosciences SC Neurosciences & Neurology GA GQ808 UT WOS:A1991GQ80800006 PM 1884169 ER PT J AU CARTER, JA BARSTOW, N POMEROY, PW CHAEL, EP LEAHY, PJ AF CARTER, JA BARSTOW, N POMEROY, PW CHAEL, EP LEAHY, PJ TI HIGH-FREQUENCY SEISMIC NOISE AS A FUNCTION OF DEPTH SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID EARTH MOTION AB Evidence is presented supporting the view that high-frequency seismic noise decreases with increased depth. Noise amplitudes are higher near the free surface where surface-wave noise, cultural noise, and natural (wind-induced) noise predominate. Data were gathered at a hard-rock site in the northwestern Adirondack lowlands of northern New York. Between 15- and 40-Hz noise levels at this site are more than 10 dB less at 945-m depth than they are at the surface, and from 40 to 100 Hz the difference is more than 20 dB. In addition, time variability of the spectra is shown to be greater at the surface than at either 335- or 945-m depths. Part of the difference between the surface and subsurface noise variability may be related to wind-induced noise. Coherency measurements between orthogonal components of motion show high-frequency seismic noise is more highly organized at the surface than it is at depth. Coherency measurements between the same component of motion at different vertical offsets show a strong low-frequency coherence at least up to 945-m vertical offsets. As the vertical offset decreases, the frequency band of high coherence increases. C1 ROUNDOUT ASSOCIATES INC,STONE RIDGE,NY 12484. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. NR 23 TC 22 Z9 23 U1 0 U2 3 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD AUG PY 1991 VL 81 IS 4 BP 1101 EP 1114 PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FZ501 UT WOS:A1991FZ50100003 ER PT J AU TAYLOR, SR DOWLA, FU AF TAYLOR, SR DOWLA, FU TI SPECTRAL YIELD ESTIMATION OF NTS EXPLOSIONS SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID UNDERGROUND NUCLEAR-EXPLOSIONS AB The yields of 299 NTS explosions have been estimated from Pn, Pg and Lg spectra (between 0.1 and 10 Hz) at four regional seismic stations. A spectral template matching technique is used where the spectra from an explosion of unknown yield are compared with the spectra of explosions of known yield. A matching function is defined that is a scaled inverse of the difference between the spectra from the known and unknown explosions. The yields from the seven closest matching explosions are then averaged to estimate the yield of the unknown event. The spectral matching technique appears to perform as well as standard regression techniques utilizing m(b)(Pn) and m(b)(Lg) measurements except that no geologic information (such as gas-filled porosity) is required. However, the spectral matching technique is only applicable to very well-calibrated test sites. The key to spectral matching is that the spectral shape is sensitive to the near-source geology. In addition to affecting the absolute spectral levels (i.e., coupling), the dynamic response of the near source material to the radiated shock wave is a major factor controlling the shape of the radiated spectra. The spectral shape can therefore be used as an indicator for predicting the coupling of an explosion, which can be subsequently used to predict its yield. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550. NR 13 TC 3 Z9 3 U1 0 U2 2 PU SEISMOLOGICAL SOC AMER PI EL CERRITO PA PLAZA PROFESSIONAL BLDG, SUITE 201, EL CERRITO, CA 94530 SN 0037-1106 J9 B SEISMOL SOC AM JI Bull. Seismol. Soc. Amer. PD AUG PY 1991 VL 81 IS 4 BP 1292 EP 1308 PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FZ501 UT WOS:A1991FZ50100014 ER PT J AU MCLAUGHLIN, SB ANDERSEN, CP HANSON, PJ TJOELKER, MG ROY, WK AF MCLAUGHLIN, SB ANDERSEN, CP HANSON, PJ TJOELKER, MG ROY, WK TI INCREASED DARK RESPIRATION AND CALCIUM DEFICIENCY OF RED SPRUCE IN RELATION TO ACIDIC DEPOSITION AT HIGH-ELEVATION SOUTHERN APPALACHIAN MOUNTAIN SITES SO CANADIAN JOURNAL OF FOREST RESEARCH-REVUE CANADIENNE DE RECHERCHE FORESTIERE LA English DT Article ID EASTERN-UNITED-STATES; SEEDLINGS; ALUMINUM; FORESTS; DECLINE; FOLIAGE; PLANTS; STANDS; FIR AB Rates of net photosynthesis and dark respiration of red spruce (Picea rubens Sarg.) foliage were examined in relationship to soil and foliar nutrient status at three elevations across each of three mountains in the southern Appalachians. These studies tested our previously stated hypothesis that increased dark respiration and reduced growth were associated with natural or induced nutrient deficiency at higher elevation sites. A consistent and highly significant reduction in the ratio of net photosynthesis to dark respiration was found at the highest sites on each mountain compared with lower sites, as had been previously reported for the initial two test sites. This response was produced by significant increases in dark respiration that were associated with low foliar calcium levels and high foliar aluminum levels found at the higher elevation sites in this region. Net photosynthesis was generally comparable between sites. A consistently inverse relationship between dark respiration and foliar calcium was found across highest and lowest elevation sites, while the midelevation sites, where calcium:aluminum ratios were highest, showed less evidence of respiratory response to calcium. Calcium in shoots was significantly reduced in association with increasing levels of soil aluminum in the rooting zone across all sites. Collectively, these studies suggest that reduced calcium supply, occurring in association with competitive inhibition of calcium uptake by high concentrations of aluminum found in soil, may have reduced the availability of carbon for red spruce growth at higher elevation sites. Inferential evidence examined, including atmospheric deposition levels, soil solution chemistry, and historical tree-ring chemistry, suggests that acidic deposition would have been a contributing factor in inducing or amplifying calcium deficiency. C1 US EPA,CORVALLIS,OR 97333. UNIV WISCONSIN,DEPT FORESTRY,MADISON,WI 53706. RP MCLAUGHLIN, SB (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Hanson, Paul J./D-8069-2011; Tjoelker, Mark/M-2413-2016 OI Hanson, Paul J./0000-0001-7293-3561; Tjoelker, Mark/0000-0003-4607-5238 NR 45 TC 70 Z9 74 U1 0 U2 5 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0045-5067 J9 CAN J FOREST RES JI Can. J. For. Res.-Rev. Can. Rech. For. PD AUG PY 1991 VL 21 IS 8 BP 1234 EP 1244 DI 10.1139/x91-172 PG 11 WC Forestry SC Forestry GA GB814 UT WOS:A1991GB81400010 ER PT J AU FREYER, JP SCHOR, PL JARRETT, KA NEEMAN, M SILLERUD, LO AF FREYER, JP SCHOR, PL JARRETT, KA NEEMAN, M SILLERUD, LO TI CELLULAR ENERGETICS MEASURED BY PHOSPHORUS NUCLEAR-MAGNETIC-RESONANCE SPECTROSCOPY ARE NOT CORRELATED WITH CHRONIC NUTRIENT DEFICIENCY IN MULTICELLULAR TUMOR SPHEROIDS .1. SO CANCER RESEARCH LA English DT Article ID P-31 NMR-SPECTROSCOPY; BREAST-CANCER SPHEROIDS; INVIVO P-31; PHOTODYNAMIC THERAPY; ENERGY-METABOLISM; GROWTH SATURATION; BLOOD-FLOW; GLUCOSE; CELLS; CHEMOTHERAPY AB We have measured the P-31 nuclear magnetic resonance spectra of EMT6/Ro multicellular tumor spheroids over a wide range of sizes under constant nutrient conditions which matched those used for culturing the spheroids. The amount of nucleotide triphosphate per cell decreased with spheroid growth, roughly in proportion to the decrease in cell volume. There was no correlation between the intracellular pH, the nucleotide triphosphate:P(i) ratio, or the phosphocreatine:P(i) ratio and either the spheroid cellularity, the mean cell volume, the S-phase fraction, the clonogenic capacity, or the amount of central necrosis. The phosphoryethanolamine:phosphorylcholine ratio also increased with increasing spheroid size. There was a negative correlation between the phosphoryethanolamine:phosphorylcholine ratio and the S-phase cell fraction or the mean cell volume; this ratio was positively correlated with the extent of central necrosis. The membrane degradation components glycerophosphorylcholine and glycerophosphorylethanolamine showed no significant changes with increasing spheroid size. These results imply that spheroid necrotic areas induced by chronic nutrient deficiencies are "invisible" to P-31 nuclear magnetic resonance and that the development of cellular quiescence in spheroids is not caused by a decrease in the steady-state level of high-energy phosphates or a reduced intracellular pH. Together, these data support a model in which cells maintain normal steady-state levels of high energy phosphates until they are very close to necrotic cell death. This implies that the deterioration of P-31 nuclear magnetic resonance spectra of tumors with increasing size is not caused by chronic nutrient deficiencies resulting from cells outgrowing the capillary supply, but rather is more related to transient nutrient deprivation phenomena. C1 UNIV CALIF LOS ALAMOS SCI LAB,BIOMED NMR FACIL,LOS ALAMOS,NM 87545. RP FREYER, JP (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CELLULAR & MOLEC BIOL GRP,LOS ALAMOS,NM 87545, USA. RI Neeman, Michal/A-8264-2008 OI Neeman, Michal/0000-0002-6296-816X FU NCI NIH HHS [CA-22585, CA-36535]; NCRR NIH HHS [RR-01315] NR 57 TC 49 Z9 49 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD AUG 1 PY 1991 VL 51 IS 15 BP 3831 EP 3837 PG 7 WC Oncology SC Oncology GA FY287 UT WOS:A1991FY28700001 PM 1855200 ER PT J AU VAUGHAN, ATM MILNER, AM GORDON, DG SCHWARTZ, JL AF VAUGHAN, ATM MILNER, AM GORDON, DG SCHWARTZ, JL TI INTERACTION BETWEEN IONIZING-RADIATION AND SUPERCOILED DNA WITHIN HUMAN TUMOR-CELLS SO CANCER RESEARCH LA English DT Article ID DOUBLE-STRAND BREAKS; TOPOISOMERASE-II; REPAIR; RADIOSENSITIVITY; SENSITIVITY; RADIOTHERAPY; L5178Y-S; MUTANTS; DOMAINS; CANCER AB We have analyzed DNA supercoiling within histone-free nuclei (nucleoids) using four human squamous cell carcinoma cell lines that express varying degrees of radiosensitivity. The entire DNA, arranged as negative supercoiled loops attached to the nuclear matrix, was extracted from single cells, stained with ethidium bromide, and passed through a flow cytometer recording both light scatter and red (DNA) fluorescence. Supercoiled loops of DNA from all cells were unwound with a low concentration of ethidium bromide, as seen by increased light scatter. Nucleoids from radiosensitive but not radioresistant cells resisted the transition from zero to positive supercoiling at higher concentrations of ethidium bromide. The profile of red DNA fluorescence from ethidium bromide-stained nucleoids showed that the radiosensitive cells expressed a greater variation in the total amount of ethidium bromide bound. After 12 Gy of gamma-radiation, radiosensitive cell lines produced nucleoids that contained a greater proportion of relaxed supercoiled DNA, making them larger than those from radioresistant cell lines. We suggest these observations are secondary effects resulting from an altered affinity between supercoiled looped DNA and the nuclear matrix. Combined with radiation damage, these structural alterations may lead to a more complex type of damage to repair within the radiosensitive cell lines. C1 UNIV BIRMINGHAM,DEPT IMMUNOL,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. ARGONNE NATL LAB,DIV BIOL & MED,ARGONNE,IL 60439. NR 35 TC 29 Z9 31 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD AUG 1 PY 1991 VL 51 IS 15 BP 3857 EP 3861 PG 5 WC Oncology SC Oncology GA FY287 UT WOS:A1991FY28700005 PM 1855203 ER PT J AU NEEMAN, M JARRETT, KA SILLERUD, LO FREYER, JP AF NEEMAN, M JARRETT, KA SILLERUD, LO FREYER, JP TI SELF-DIFFUSION OF WATER IN MULTICELLULAR SPHEROIDS MEASURED BY MAGNETIC-RESONANCE MICROIMAGING SO CANCER RESEARCH LA English DT Article ID INTRAVOXEL INCOHERENT MOTIONS; MOLECULAR-DIFFUSION; APPARENT DIFFUSION; SELECTIVE PULSES; SLICE SELECTION; TUMOR SPHEROIDS; MULTIECHO MRI; FROG-MUSCLE; NMR; MICROSCOPY AB Nuclear magnetic resonance microimaging measurements of the self-diffusion coefficient of water in large (> 2 mm) EMT-6 multicellular spheroids were performed in order to elucidate diffusion mechanisms in tumors. Pulsed gradient spin echo-imaging methods were developed for measuring diffusion in an intravoxel multicompartment system. The self-diffusion coefficient (at 22-degrees-C) for water in the medium (D(m)) consisted of only a single diffusion compartment [D(m) = 1.99 +/- 0.03 (SE) x 10(-5) cm2/s]. Similarly, the spheroid necrotic center showed a single water diffusion compartment with a self-diffusion coefficient (D(c)) significantly lower than that of the medium (D(c) = 1.54 +/- 0.05 X 10(-5) cm2/s). The spheroid viable rim region showed two distinct compartments of approximately equal volume, one with a large diffusion coefficient (1.70 +/- 0.12 x 10(-5) cm2/s) and a second with a significantly smaller diffusion coefficient (0.25 +/-0.01 x 10(-5) cm2/s). We propose that these two experimentally distinguishable compartments correspond to the extra- and intracellular regions, respectively, of the viable rim of the spheroid. Although the diffusion coefficients were significantly different in the medium, the necrotic center, and the viable rim, the activation energy for diffusion was the same in the three regions (0.20 eV). Studies of perfused spheroids at 37-degrees-C show the same dependence of the diffusion coefficients on the diffusion filter as observed for unperfused spheroids at 22-degrees-C. These results demonstrate the ability of nuclear magnetic resonance microimaging to investigate diffusion at the cellular level, which will lead to a better understanding of microenvironmental regulation in tumors. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,BIOMED NMR FACIL,LOS ALAMOS,NM 87545. RP NEEMAN, M (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV LIFE SCI,CELLULAR & MOLEC BIOL GRP,MAIL STOP M888,LOS ALAMOS,NM 87545, USA. RI Neeman, Michal/A-8264-2008 OI Neeman, Michal/0000-0002-6296-816X NR 48 TC 46 Z9 46 U1 3 U2 8 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD AUG 1 PY 1991 VL 51 IS 15 BP 4072 EP 4079 PG 8 WC Oncology SC Oncology GA FY287 UT WOS:A1991FY28700037 PM 1855222 ER PT J AU AINSWORTH, CC MCVEETY, BD SMITH, SC ZACHARA, JM AF AINSWORTH, CC MCVEETY, BD SMITH, SC ZACHARA, JM TI TRANSFORMATION OF 1-AMINOAPTHTHALENE AT THE SURFACE OF SMECTITE CLAYS SO CLAYS AND CLAY MINERALS LA English DT Article DE POLYMERIZATION; SMECTITE; SORPTION; SURFACE CATALYSIS ID RESONANCE RAMAN-SPECTROSCOPY; AROMATIC-MOLECULES; MONTMORILLONITE; ANILINE; SOIL; ADSORPTION; INTERLAYER; OXIDATION; HECTORITE; BENZIDINE AB One-aminonaphthalene is sorbed onto the Na-saturated smectite clays, montmorillonite and hectorite, by cation exchange. In the presence of Fe3+, either in the clay structure or on the clay surface, sorption is followed by the formation of a blue-colored complex, with the continuous disappearance of aminonaphthalene from solution and the clay surface. The rate of aminonaphthalene disappearance decreases as pH increases. With time, four major products that appear to be structural isomers of N(4-aminonaphthyl)-1-naphthylamine are produced. A simplified model of this transformation is suggested to be the oxidation by Fe3+ of sorbed aminonaphthalene forming a radical cation-clay complex. A subsequent reaction between the radical-cation and a neutral aminonaphthalene molecule takes place, with the products being strongly sorbed to the clay surface. RP AINSWORTH, CC (reprint author), PACIFIC NW LAB, MSN K3-61, POB 999, RICHLAND, WA 99352 USA. NR 36 TC 11 Z9 11 U1 0 U2 5 PU CLAY MINERALS SOCIETY PI BOULDER PA PO BOX 4416, BOULDER, CO 80306 SN 0009-8604 J9 CLAY CLAY MINER JI Clay Clay Min. PD AUG PY 1991 VL 39 IS 4 BP 416 EP 427 DI 10.1346/CCMN.1991.0390411 PG 12 WC Chemistry, Physical; Geosciences, Multidisciplinary; Mineralogy; Soil Science SC Chemistry; Geology; Mineralogy; Agriculture GA GG365 UT WOS:A1991GG36500011 ER PT J AU BISH, DL CHIPERA, SJ AF BISH, DL CHIPERA, SJ TI DETECTION OF TRACE AMOUNTS OF ERIONITE USING X-RAY-POWDER DIFFRACTION - ERIONITE IN TUFFS OF YUCCA MOUNTAIN, NEVADA, AND CENTRAL TURKEY SO CLAYS AND CLAY MINERALS LA English DT Article DE CLINOPTILOLITE; DETECTION LIMITS; ERIONITE; PROFILE REFINEMENT; X-RAY POWDER DIFFRACTION; ZEOLITIC TUFFS ID EXPOSURE; FIBERS AB Recent data in the biological literature suggest that the natural zeolite erionite may be more tumorigenic than asbestos minerals. Because of its potential biological importance, a technique has been developed to facilitate detection of erionite in tuffaceous rocks to a lower limit of detection (LLD) between 100 and 500 ppm. The method involves the use of automated X-ray powder diffraction instrumentation with long count times, as much as 360 s/step. The presence of interfering phases, such as smectite or clinoptilolite, raises the LLD. Ethylene glycol solvation of smectite improves the LLD, and profile fitting with clinoptilolite-bearing mixtures improves quantification. Application of these methods to tuffs from central Turkey allowed improved detection and more accurate quantification compared with previous scanning electron microscope examinations. Use of these methods with tuffs from Yucca Mountain, Nevada, the potential site for the nation's first high-level radioactive waste repository, showed that erionite occurs sporadically. Erionite is found only in the altered zone directly above the lower vitrophyre of the Topopah Spring Member. This altered zone is anomalous in that is contains a variety of zeolites that are either rare or absent in other Yucca Mountain tuffs. It appears that erionite is restricted to fractures and must have formed under unusual and variable conditions in the altered zone. RP BISH, DL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87544, USA. NR 26 TC 22 Z9 23 U1 0 U2 1 PU CLAY MINERALS SOCIETY PI BOULDER PA PO BOX 4416, BOULDER, CO 80306 SN 0009-8604 J9 CLAY CLAY MINER JI Clay Clay Min. PD AUG PY 1991 VL 39 IS 4 BP 437 EP 445 DI 10.1346/CCMN.1991.0390413 PG 9 WC Chemistry, Physical; Geosciences, Multidisciplinary; Mineralogy; Soil Science SC Chemistry; Geology; Mineralogy; Agriculture GA GG365 UT WOS:A1991GG36500013 ER PT J AU STOSS, FW AF STOSS, FW TI ENVIRONMENT ONLINE - THE GREENING OF DATABASES .1. GENERAL INTEREST DATABASES SO DATABASE LA English DT Article ID FULL-TEXT C1 UNIV TENNESSEE,CTR ENERGY ENVIRONM & RESOURCES,KNOXVILLE,TN 37996. RP STOSS, FW (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,CTR CARBON DIOXIDE INFORMAT,OAK RIDGE,TN, USA. NR 10 TC 7 Z9 7 U1 0 U2 0 PU ONLINE INC PI WILTON PA 462 DANBURY RD, WILTON, CT 06897-2126 SN 0162-4105 J9 DATABASE JI Database PD AUG PY 1991 VL 14 IS 4 BP 13 EP 27 PG 15 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA FU964 UT WOS:A1991FU96400006 ER PT J AU STEINMAN, AD MULHOLLAND, PJ PALUMBO, AV FLUM, TF DEANGELIS, DL AF STEINMAN, AD MULHOLLAND, PJ PALUMBO, AV FLUM, TF DEANGELIS, DL TI RESILIENCE OF LOTIC ECOSYSTEMS TO A LIGHT-ELIMINATION DISTURBANCE SO ECOLOGY LA English DT Article DE ALGAE; DISTURBANCE; HERBIVORY; NUTRIENT CYCLING; PERIPHYTON; RESILIENCE; SNAILS; STABILITY; STREAMS ID STREAM ECOSYSTEM; AMMONIUM ASSIMILATION; DESERT STREAM; PERIPHYTON; COMMUNITIES; RECOVERY; ALGAE; PHOSPHORUS; RESPONSES; STABILITY AB Resilience of eight laboratory stream ecosystems was evaluated following a 92-d light elimination disturbance. Prior to the disturbance, four treatments (snails/once-through flow, snails/recirculated flow, no snails/once-through flow, no snails/recirculated flow) were imposed on the streams, resulting in systems with different biomass levels, nutrient concentrations, and recycling indices. Based on results from models of ecosystem response to disturbance, we hypothesized a priori that once-through streams would recover more quickly than recirculated streams within each grazing regime and that grazed streams would recover more quickly than ungrazed streams within each flow regime. Our results indicated that once-through streams did have a higher resilience than recirculated streams when snails were absent, but not when snails were present. Indeed, most parameters recovered faster in streams without snails than those with them, irrespective of flow regime, in contrast to our prediction. Despite the faster initial recovery rates in once-through than recirculated streams without snails, final biomass levels were similar between these streams. Measurements of phosphorus recycling indices suggested that higher rates of nutrient recycling near the end of the experiment in recirculated streams compensated for the lower inputs of new nutrients in the incoming water, allowing biomass to reach levels similar to those in once-through streams. Results from this empirical work are consistent with the theory that resilience is positively associated with the rate of nutrient input to a nutrient-limited system, but are inconsistent with the idea that resilience is positively associated with the addition of a herbivore trophic level to the system. Grazing intensity (i.e., density), as well as behavioral (e.g., vagility) and life history characteristics may need to be considered in future models. RP STEINMAN, AD (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,BLDG 1504,OAK RIDGE,TN 37831, USA. RI Palumbo, Anthony/A-4764-2011; Mulholland, Patrick/C-3142-2012; OI Palumbo, Anthony/0000-0002-1102-3975; Steinman, Alan/0000-0002-4886-4305 NR 76 TC 37 Z9 38 U1 2 U2 7 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 0012-9658 J9 ECOLOGY JI Ecology PD AUG PY 1991 VL 72 IS 4 BP 1299 EP 1313 DI 10.2307/1941103 PG 15 WC Ecology SC Environmental Sciences & Ecology GA GB185 UT WOS:A1991GB18500014 ER PT J AU BLACKWOOD, LG AF BLACKWOOD, LG TI ASSURANCE LEVELS OF STANDARD SAMPLE-SIZE FORMULAS - IMPLICATIONS FOR DATA QUALITY PLANNING SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article RP BLACKWOOD, LG (reprint author), IDAHO NATL ENGN LAB,MEASUREMENT SYST ENGN UNIT,IDAHO FALLS,ID, USA. NR 0 TC 3 Z9 3 U1 0 U2 2 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 AUG PY 1991 VL 25 IS 8 BP 1366 EP 1367 PG 2 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FY998 UT WOS:A1991FY99800007 ER PT J AU PHELPS, TJ NIEDZIELSKI, JJ MALACHOWSKY, KJ SCHRAM, RM HERBES, SE WHITE, DC AF PHELPS, TJ NIEDZIELSKI, JJ MALACHOWSKY, KJ SCHRAM, RM HERBES, SE WHITE, DC TI BIODEGRADATION OF MIXED-ORGANIC WASTES BY MICROBIAL CONSORTIA IN CONTINUOUS-RECYCLE EXPANDED-BED BIOREACTORS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID ALIPHATIC-COMPOUNDS; TRICHLOROETHYLENE; BIOTRANSFORMATION; DEGRADATION; SOIL AB Microbial consortia enriched from subsurface sediments contaminated with chlorinated hydrocarbons proved capable of degrading mixed-organic wastes. Methane and/or propane as foodstock enabled aerobic mineralization of greater than 20 mg L-1 trichloroethylene (TCE) plus 1 mg L-1 vinyl chloride, benzene, and toluene in cell suspension or bioreactor experiments. The microbial consortia degraded 80-95% of TCE at 20 mg L-1 within 5 days in continuous-recycle expanded-bed bioreactors requiring 50-100 mol of food stock/mol of TCE degraded. When the bioreactors were challenged with groundwaters contaminated with mixed-organic wastes, the microbial consortia degraded greater than 99% of the benzene, toluene, xylene, vinyl chloride, and nine chlorinated hydrocarbons, 85% of the TCE, and 60% of the tetrachloroethylene within 21 days, while requiring 80-mu-mol of methane plus propane per micromole of mixed-organic waste degraded. The potential for bioremediation of groundwater contaminated with mixed-organic wastes was demonstrated in laboratory reactors. C1 UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP PHELPS, TJ (reprint author), UNIV TENNESSEE,INST APPL MICROBIOL,10515 RES DR,SUITE 300,KNOXVILLE,TN 37932, USA. RI phelps, tommy/A-5244-2011 NR 18 TC 25 Z9 25 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 AUG PY 1991 VL 25 IS 8 BP 1461 EP 1465 DI 10.1021/es00020a015 PG 5 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FY998 UT WOS:A1991FY99800021 ER PT J AU RITCHIE, B AF RITCHIE, B TI RADIATION REACTION SO FOUNDATIONS OF PHYSICS LETTERS LA English DT Article DE RADIATION; REACTION; LAMB SHIFT; SPONTANEOUS DECAY AB I solve Maxwell's equation for a current produced by a classical, point electron. My solution, which represents the self electromagnetic field of the electron, can be found along the electron trajectory, where the conventional retarded-time solution is singular. The solution is in the form of an integral over all spectral frequencies of the field and has an Ehrenfest correspondence with the operator field of quantum electrodynamics (QED). Use of the field in the equation of motion for a harmonically-bound electron leads to an equation having the same form as the Schrodinger equation for a two-level atom interacting with the QED vacuum field. RP RITCHIE, B (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0894-9875 J9 FOUND PHYS LETT JI Found. Phys. Lett. PD AUG PY 1991 VL 4 IS 4 BP 375 EP 384 DI 10.1007/BF00665896 PG 10 WC Physics, Multidisciplinary SC Physics GA GF785 UT WOS:A1991GF78500005 ER PT J AU LAUF, RJ HOFFHEINS, BS AF LAUF, RJ HOFFHEINS, BS TI ANALYSIS OF LIQUID FUELS USING A GAS SENSOR ARRAY SO FUEL LA English DT Article DE LIQUID FUELS; ANALYSIS; GAS SENSOR ARRAY AB We describe a sensor array technique for the qualitative analysis of motor and turbine fuels. A selected array of chemical sensors produces unique signatures for many chemical species. In testing some aviation fuels we have found that their signatures are unique and sufficiently reproducible to be readily identified by visual inspection and also by a PC-based neural network simulator. With automotive fuels we have tested, gasohol mixtures have strikingly different signatures from pure gasoline. The differences among fuels with different octane ratings are subtle but perceptible. The sensor array and the signature identification system make up the components of a testbed from which parameters can be determined for a specific application. All testbed components can ultimately be miniaturized in application-specific hardware for use in battery-operated, on-site inspection instruments. RP LAUF, RJ (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 11 TC 13 Z9 13 U1 0 U2 0 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 AUG PY 1991 VL 70 IS 8 BP 935 EP 940 DI 10.1016/0016-2361(91)90047-E PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FZ589 UT WOS:A1991FZ58900005 ER PT J AU APEL, WA DUGAN, PR WIEBE, MR AF APEL, WA DUGAN, PR WIEBE, MR TI USE OF METHANOTROPHIC BACTERIA IN GAS-PHASE BIOREACTORS TO ABATE METHANE IN COAL-MINE ATMOSPHERES SO FUEL LA English DT Article DE COAL; BIOREACTORS; METHANE ID METHYLOSINUS-TRICHOSPORIUM AB The potential of using the methanotrophic bacterium Methylomonas methanica to remove methane from coal mine atmospheres was investigated using a bench scale, gas phase bioreactor. The bioreactor was constructed from a cylindrical glass column packed with bio-rings to support bacterial growth. M. methanica grew readily on the bio-rings with a total of 133.4 g (wet weight) of the bacterium being contained in the bioreactor. Methane in air mixtures ranging from 0 to 50.9% were recirculated through the 4.5 1 (void volume) bioreactor at a rate of 200 ml min-1, and significant levels of methane removal were noted. With a 35% methane/air mixture, 90.4% of the methane was removed in 24 h. This equated to a removal rate of approximately 38 mg methane h-1. Using a 12% methane/air mixture the removal rate was approximately 23 mg methane h-1. From these results, it was concluded that methanotrophic bacteria grown in gas phase bioreactors are capable of removing significant amounts of methane from methane/air mixtures and may be of practical use in removing methane from coal mine atmospheres. RP APEL, WA (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 10 TC 18 Z9 21 U1 1 U2 12 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 AUG PY 1991 VL 70 IS 8 BP 1001 EP 1003 DI 10.1016/0016-2361(91)90058-I PG 3 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FZ589 UT WOS:A1991FZ58900016 ER PT J AU STOTLER, DP GOLDSTON, RJ AF STOTLER, DP GOLDSTON, RJ TI IGNITION PROBABILITIES FOR COMPACT IGNITION TOKAMAK DESIGN POINTS SO FUSION TECHNOLOGY LA English DT Article DE TOKAMAK; IGNITION; GLOBAL TRANSPORT ID ENERGY CONFINEMENT; TRANSPORT SIMULATIONS; PLASMA-CONFINEMENT; SCALING LAWS; REACTOR; TFTR; PERFORMANCE; DISCHARGES; MODELS; LIMITS AB A global reactor performance code employing Monte Carlo techniques has been developed to study the "probability of ignition" and has been applied to several configurations of a compact, high-field ignition tokamak to determine the relative benefits of raising the plasma current and peaking the density profile. Probability distributions for the critical physics parameters in the code are estimated using existing experimental data. An energy confinement scaling representing a 1 to 2.5 times improvement over the L mode is assumed; the range of this multiplier was chosen to reflect the uncertainty in extrapolating the energy confinement time to the high-field ignition regime. Even with fairly broad input probability distributions, the probability of ignition improves significantly with increasing plasma current and density profile peaking. Raising the plasma current by 2 MA has about the same impact as raising the peak-to-average density ratio from approximately 1 to approximately 3. With either this density peaking or a plasma current greater-than-or-equal-to 11 MA, the probability of ignition is computed to be greater-than-or-equal-to 40%. In other cases, values of Q (the ratio of the fusion power to the sum of the ohmic and auxiliary input powers) of the order of 10 are generally obtained. Comparisons of our empirically based confinement assumptions with two theory-based transport models yield conflicting results. RP STOTLER, DP (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. RI Stotler, Daren/J-9494-2015 OI Stotler, Daren/0000-0001-5521-8718 NR 56 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 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD AUG PY 1991 VL 20 IS 1 BP 7 EP 25 PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FY465 UT WOS:A1991FY46500001 ER PT J AU REDI, MH COHEN, SA AF REDI, MH COHEN, SA TI EFFECTS OF PARTICLE-TRANSPORT ON HELIUM ASH ACCUMULATION AND SUSTAINED IGNITION IN THE INTERNATIONAL THERMONUCLEAR EXPERIMENTAL REACTOR SO FUSION TECHNOLOGY LA English DT Article DE HELIUM ASH; COMPUTER SIMULATION; ALPHA-PARTICLE HEATING ID CONFINEMENT; EXHAUST; PLASMA; BALDUR; CODE AB The buildup of helium ash has been studied in a series of simulations with the BALDUR transport code in the proposed International Thermonuclear Experimental Reactor (ITER) experiment at low density n(e)BAR = 8.3 x 10(19)/m-3. Sustained ignition is found to be possible only for R(He) < 0.5 --> 0.9, with lower values required at lower edge densities. Using radially dependent thermal diffusivities that were scaled from Joint European Torus (JET) values, the effects of particle transport coefficients and edge recycling on helium poisoning of ignition are studied. A sustained ignition is obtained when the exhaust of helium from the edge plasma is allowed to exceed 10% of the helium flux into the edge plasma from the core plasma, and the ratio of particle (helium ion) to thermal diffusivities, D/chi, is > 1/4. The simulations include the effects of sawtooth oscillations, radiative as well as conductive energy loss channels, and density profile variations. RP REDI, MH (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 37 TC 7 Z9 7 U1 1 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD AUG PY 1991 VL 20 IS 1 BP 48 EP 57 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FY465 UT WOS:A1991FY46500004 ER PT J AU KWIATKOWSKI, TJ BEAUDET, AL TRASK, BJ ZOGHBI, HY AF KWIATKOWSKI, TJ BEAUDET, AL TRASK, BJ ZOGHBI, HY TI LINKAGE MAPPING AND FLUORESCENCE INSITU HYBRIDIZATION OF TCTE1 ON HUMAN-CHROMOSOME 6P - ANALYSIS OF DINUCLEOTIDE POLYMORPHISMS ON NATIVE GELS SO GENOMICS LA English DT Article ID POLYMERASE CHAIN-REACTION; SPINOCEREBELLAR ATAXIA; SHORT ARM; HLA; MARKERS; LOCUS; GENE C1 BAYLOR UNIV,DEPT PEDIAT,HOUSTON,TX 77030. HOWARD HUGHES MED INST,HOUSTON,TX 77030. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,LIVERMORE,CA 94550. RP KWIATKOWSKI, TJ (reprint author), BAYLOR UNIV,INST MOLEC GENET,HOUSTON,TX 77030, USA. FU NICHD NIH HHS [HD00684, HD-17665]; NINDS NIH HHS [NS27699] NR 20 TC 22 Z9 22 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 0888-7543 J9 GENOMICS JI Genomics PD AUG PY 1991 VL 10 IS 4 BP 921 EP 926 DI 10.1016/0888-7543(91)90180-M PG 6 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA FW380 UT WOS:A1991FW38000009 PM 1916824 ER PT J AU WANG, K ORTH, CJ ATTREP, M CHATTERTON, BDE HOU, HG GELDSETZER, HHJ AF WANG, K ORTH, CJ ATTREP, M CHATTERTON, BDE HOU, HG GELDSETZER, HHJ TI GEOCHEMICAL EVIDENCE FOR A CATASTROPHIC BIOTIC EVENT AT THE FRASNIAN FAMENNIAN BOUNDARY IN SOUTH CHINA SO GEOLOGY LA English DT Article ID CRETACEOUS-TERTIARY BOUNDARY; MASS-EXTINCTION HORIZON; IMPACT AB A strong delta-C-13 anomaly coincides with a weak Ir anomaly at the Frasnian/Famennian (F/F) boundary exposed at Xiangtian, Guangxi, south China. The maximum whole-rock Ir abundance is 0.23 ppb (0.35 ppb on a carbonate-free basis) compared with averages of 0.016 and 0.044 ppb above and below the boundary interval. The delta-C-13 in carbonate abruptly shifts from a late Frasnian level of about +1 parts per thousand to -2.49 parts per thousand in the boundary interval and then abruptly returns to pre-boundary levels, suggesting a temporary reduction of surface-water biomass. A widely distributed (over at least several hundred kilometres) limestone breccia unit of possible wave-deposit origin is present directly below the boundary in south China. Enrichments of Al, V, Cr, As, and U, and a dip in the Mn abundance in the boundary interval indicate that reducing conditions might have been associated with the element enrichment. However, an alternative hypothesis is that oceanic impact(s) at the F/F boundary near south China provided the excess Ir and caused the biotic crisis and the formation of breccia deposits observed in the Late Devonian South China Sea. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. CHINESE ACAD GEOL SCI,INST GEOL,BEIJING,PEOPLES R CHINA. GEOL SURVEY CANADA,CALGARY T2L 2A7,ALBERTA,CANADA. RP WANG, K (reprint author), UNIV ALBERTA,DEPT GEOL,EDMONTON T6G 2E3,ALBERTA,CANADA. NR 20 TC 75 Z9 89 U1 3 U2 5 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD AUG PY 1991 VL 19 IS 8 BP 776 EP 779 DI 10.1130/0091-7613(1991)019<0776:GEFACB>2.3.CO;2 PG 4 WC Geology SC Geology GA GA306 UT WOS:A1991GA30600002 ER PT J AU LINN, AM DEPAOLO, DJ INGERSOLL, RV AF LINN, AM DEPAOLO, DJ INGERSOLL, RV TI ND-SR ISOTOPIC PROVENANCE ANALYSIS OF UPPER CRETACEOUS GREAT VALLEY FORE-ARC SANDSTONES SO GEOLOGY LA English DT Article ID CENTRAL SIERRA-NEVADA; CENTRAL CALIFORNIA; NORTHERN; EVOLUTION; SEDIMENTS; BASIN; SYSTEMATICS; PETROFACIES; BATHOLITHS; NEODYMIUM AB The provenance of fore-arc sandstones of the Upper Cretaceous Great Valley Group was investigated by using measurements of Sm-Nd and Rb-Sr isotope ratios and major and trace element concentrations. The objective was to elucidate the erosional history of the adjacent Sierra Nevada arc and its relation to magmatism and fore-arc sedimentation. Relatively detailed provenance information is obtainable because the currently exposed plutonic rocks of the arc (and, by inference, the Cretaceous volcanic rocks) have large geographic gradients in isotopic composition, mainly from west to east across the arc. The relation of epsilon-Nd to epsilon-Sr and to major and trace elements in Great Valley sandstones is the same as in the plutonic rocks of the Sierra Nevada; this observation confirms that the arc was the primary source of sediment and that the chemistry of the detritus was not significantly disturbed by sedimentary processes. With decreasing epsilon-Nd, there is an increase in K2O, Rb, Pb, Ba, La, and U, and MgO, Ni, and Cr decrease. The epsilon-Nd of sandstones decreases with decreasing depositional age from -0.7 to -5.0 in 97 to 73 Ma strata. The epsilon-Nd and age of the sandstones closely match those of the plutonic rocks of the Sierra Nevada. This observation indicates that the location of the mean sandstone source and the active volcanic front were nearly coincident in time and space; thus, the isotopic compositions of the sandstones directly record the temporal and geographic variations in arc magmatism. The volcanic "roof" of the Sierra Nevada arc was evidently chemically and isotopically equivalent to its plutonic roots. Prearc metasedimentary rocks did not significantly contribute to the isotopic or geochemical composition of the fore-arc sandstones. C1 UNIV CALIF BERKELEY,BERKELEY CTR ISOTOPE GEOCHEM,DEPT GEOL & GEOPHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV EARTH SCI,BERKELEY,CA 94720. RP LINN, AM (reprint author), UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024, USA. NR 32 TC 28 Z9 30 U1 1 U2 2 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD AUG PY 1991 VL 19 IS 8 BP 803 EP 806 DI 10.1130/0091-7613(1991)019<0803:NSIPAO>2.3.CO;2 PG 4 WC Geology SC Geology GA GA306 UT WOS:A1991GA30600009 ER PT J AU LAY, T YOUNG, CJ AF LAY, T YOUNG, CJ TI ANALYSIS OF SEISMIC SV WAVES IN THE CORES PENUMBRA SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID BOUNDARY; MANTLE AB Vertically-polarized S-waves (SV) attenuate rapidly as they diffract around the Earth's core, whereas horizontally-polarized S-waves (SH) propagate to large distances in the core shadow zone. The amplitude decay of diffracted SV signals is so strong that few studies have been made of these phases, despite their acute sensitivity to velocity structure just above the core-mantle boundary. We analyze SV signals in the penumbra of the core's shadow, finding systematic waveform complexities indicative of local stratification and apparent anisotropy at the base of the mantle, with implications for the dynamic processes in this internal boundary layer. C1 SANDIA NATL LABS,DIV 6231,ALBUQUERQUE,NM 87185. RP LAY, T (reprint author), UNIV CALIF SANTA CRUZ,INST TECTON,SEISMOL LAB,SANTA CRUZ,CA 95064, USA. NR 12 TC 58 Z9 58 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 AUG PY 1991 VL 18 IS 8 BP 1373 EP 1376 DI 10.1029/91GL01691 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000001 ER PT J AU TRAVIS, BJ JANECKY, DR ROSENBERG, ND AF TRAVIS, BJ JANECKY, DR ROSENBERG, ND TI 3-DIMENSIONAL SIMULATION OF HYDROTHERMAL CIRCULATION AT MIDOCEAN RIDGES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID GALAPAGOS-SPREADING-CENTER; EAST PACIFIC RISE; MAGMA CHAMBER; CONVECTION; FIELD AB Results of numerical simulations of three dimensional hydrothermal convection in a layered medium representative of mid-ocean ridge environments are presented. Regional-scale three dimensional flow patterns naturally arise from reasonable assumptions about permeability distributions and magnitude of base heating. These flow patterns are characterized by broad downwelling but restricted regions of upwelling. Magmatic intrusions along the ridge axis induce vigorous convection restricted to the vicinity of the ridge-axis, whose character changes during the intrusion cooling phase. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. UNIV CALIF SANTA BARBARA,SANTA BARBARA,CA 93106. RP TRAVIS, BJ (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545, USA. RI Wright, Dawn/A-4518-2011 OI Wright, Dawn/0000-0002-2997-7611 NR 13 TC 42 Z9 43 U1 2 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG PY 1991 VL 18 IS 8 BP 1441 EP 1444 DI 10.1029/91GL01776 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000018 ER PT J AU NOVAKOV, T RIVERACARPIO, C SCHMIDT, RC ROGERS, CF AF NOVAKOV, T RIVERACARPIO, C SCHMIDT, RC ROGERS, CF TI MEASUREMENT OF CLOUD INTEGRATED BACKSCATTERING COEFFICIENT WITH A NEPHELOMETER SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID CLIMATE AB We describe the application of a nephelometer to in-situ, real-time measurement of the integrated backscattering coefficient sigma-bs of cloud drops. For thin and moderately thick clouds, this quantity is related to the cloud albedo A, for 0-degrees zenith solar radiation, through the relation A = sigma-bs(L), where L is the geometric cloud thickness. The instrument was used in a field experiment on El Yunque peak in Puerto Rico. The measured sigma-bs values are in agreement with results of Mie theory calculations, using independently measured cloud drop concentration and size distribution. C1 DESERT RES INST,RENO,NV 89506. RP NOVAKOV, T (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV APPL SCI,BLDG 73,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG PY 1991 VL 18 IS 8 BP 1453 EP 1456 DI 10.1029/91GL01721 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000021 ER PT J AU BERTMAN, SB ROBERTS, JM AF BERTMAN, SB ROBERTS, JM TI A PAN ANALOG FROM ISOPRENE PHOTOOXIDATION SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID GAS-PHASE REACTION; METHYL VINYL KETONE; ORGANIC NITRATES; BIOGENIC HYDROCARBONS; ALKYL NITRATES; NIWOT RIDGE; NOX; NITROGEN; TROPOSPHERE; PRODUCT AB Peroxymethacrylic nitric anhydride (MPAN), a potential atmospheric photoproduct, was synthesized and characterized in the laboratory for the first time. The compound was identified by FT-IR, GC-MS, GC/ECD, and decomposition studies. Purification of synthetic mixtures provided a sample suitable for calibration of instruments for ambient atmospheric sampling. Possible field identification of MPAN is reported, and the role of MPAN in the chemistry of the rural troposphere is discussed. C1 BROOKHAVEN NATL LAB,DIV CRYPTOGAMIE,UPTON,NY 11973. RI Roberts, James/A-1082-2009 OI Roberts, James/0000-0002-8485-8172 NR 29 TC 37 Z9 37 U1 0 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG PY 1991 VL 18 IS 8 BP 1461 EP 1464 DI 10.1029/91GL01852 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000023 ER PT J AU EICHELBERGER, JC HILDRETH, W PAPIKE, JJ AF EICHELBERGER, JC HILDRETH, W PAPIKE, JJ TI THE KATMAI SCIENTIFIC DRILLING PROJECT, SURFACE PHASE - INVESTIGATION OF AN EXCEPTIONAL IGNEOUS SYSTEM SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID NATIONAL-PARK; VALLEY; SMOKES; ALASKA AB Explosive volcanism is the response of magma to rapid decompression. Inherent complexity of volcanoes and lack of observations at depth in young systems are impediments to proper understanding of this important phenomenon. The Katmai Scientific Drilling Project is an interdisciplinary surface and drilling investigation of an exceptionally large and relatively simple explosive volcanic event that occurred in Alaska's Aleutian Range in 1912. The surface phase of the project is now largely complete, and results are presented in the papers that follow. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. US GEOL SURVEY,MENLO PK,CA 94025. UNIV NEW MEXICO,INST METEORIT,ALBUQUERQUE,NM 87131. RI Eichelberger, John/H-6199-2016 NR 22 TC 4 Z9 4 U1 1 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 AUG PY 1991 VL 18 IS 8 BP 1513 EP 1516 DI 10.1029/91GL01472 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000036 ER PT J AU GOODLIFFE, AM STONE, DB KIENLE, J KASAMEYER, P AF GOODLIFFE, AM STONE, DB KIENLE, J KASAMEYER, P TI THE VENT OF THE 1912 KATMAI ERUPTION - GRAVITY AND MAGNETIC MEASUREMENTS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID THOUSAND-SMOKES; NATIONAL-PARK; VALLEY; ALASKA AB This study is aimed at defining the boundary and internal structure of the Novarupta vent area, the source of the 1912 Katmai eruption. A geodetic grid consisting of 145 stations was occupied for gravity and magnetic measurements and an aeromagnetic survey was flown at 1100 m above sea level. The combined gravity and magnetic data indicate that there are probably two intrusive bodies within the vent, not just one at Novarupta, as was previously thought. The outline of the overall vent at the surface is well defined by the aeromagnetic survey, and the vent appears to dip inwards indicating that it flares from depth. This is in contrast to the piston-like collapse thought to have taken place at Mt. Katmai in 1912. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP GOODLIFFE, AM (reprint author), UNIV ALASKA,INST GEOPHYS,FAIRBANKS,AK 99775, USA. NR 11 TC 3 Z9 3 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG PY 1991 VL 18 IS 8 BP 1521 EP 1524 DI 10.1029/91GL01760 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000038 ER PT J AU KASAMEYER, P WILT, M DAILY, W FELSKE, D AF KASAMEYER, P WILT, M DAILY, W FELSKE, D TI TIME-DOMAIN ELECTROMAGNETIC SOUNDINGS IN THE VICINITY OF NOVARUPTA, KATMAI NATIONAL-PARK, ALASKA SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB A time-domain electromagnetic survey was conducted near the rhyolite dome Novarupta. We found a continuous (60 to 100 m thick) high-resistivity surface layer, which represents the unsaturated or unaltered tephra and whose base is probably the water table. This layer is thinnest near fumaroles; the largest thin areas lie under the tephra ring surrounding Novarupta, where the altered zones extend to a depth of more than 100 m. A deeper conductive layer is associated with the top of the underlying sedimentary rocks and is inferred to indicate the depth to the pre-eruptive surface. RP KASAMEYER, P (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 10 TC 1 Z9 1 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG PY 1991 VL 18 IS 8 BP 1525 EP 1528 DI 10.1029/91GL01759 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000039 ER PT J AU BALLARD, S CARRIGAN, CR MCCONNELL, VS AF BALLARD, S CARRIGAN, CR MCCONNELL, VS TI SHALLOW CONDUCTIVE-COMPONENT OF HEAT-FLOW NEAR NOVARUPTA DOME, KATMAI, ALASKA SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB An investigation of the shallow conductive heat flow from one of the half dozen thermal areas in the vicinity of Novarupta Dome suggests that convective heat transport by hydrothermal fluids is the dominant mode of heat transfer in the shallow subsurface within the thermal areas. The thermal observations are used to qualitatively characterize the state of the hydrothermal system at depth. We conclude that there is no shallow (100-200 m), laterally extensive heat source beneath the vent region but rather that the source of the heat emanating from the thermal areas is the cooling conduit that supplied magma to the surface during the 1912 eruption. This heat is transported to the surface by vapor flow along high permeability pathways associated with the margins of the 1912 vent. The thermal observations are also used to place a lower bound on the characteristic diameter of the conduit of 50 meters. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV EARTH SCI,L-206,LIVERMORE,CA 94550. RP BALLARD, S (reprint author), SANDIA NATL LABS,DEPT 6230,ALBUQUERQUE,NM 87185, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG PY 1991 VL 18 IS 8 BP 1529 EP 1532 DI 10.1029/91GL01666 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000040 ER PT J AU WESTRICH, HR EICHELBERGER, JC HERVIG, RL AF WESTRICH, HR EICHELBERGER, JC HERVIG, RL TI DEGASSING OF THE 1912 KATMAI MAGMAS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB Pre- and post-eruptive H2O, F, Cl, and S contents of the three 1912 Katmai magmas were inferred from analyses of melt inclusions and matrix glasses in tephra samples. With increasing silica content (andesite --> rhyolite), pre-eruptive melt H2O increases from greater-than-or-equal-to 1.0 to 3.8 wt.%, Cl increases slightly from 1700 to 1900 ppm, S decreases from 170 to less-than-or-equal-to 65 ppm, and F remains constant at 550 ppm. These variations are not consistent with a simple crystal fractionation relationship. For plausible chamber depths, the magmas were vapor undersaturated during storage and fragmented during the last few hundred meters of ascent, consistent with geologic evidence for excavation of the vent funnel within the upper 1 km. Vitrophyres of welded intravent fallback tephra ejected late in the eruption show that extensive degassing and complete welding could take place in less than the 60-hour eruptive period. Release of HCl was twice that of the 1980 eruption of Mount St. Helens while H2SO4 output was comparable to that of the 3.5 ka Santorini eruption. Significant retention of Cl and F, which would be released along with residual H2O during high-temperature devitrification, may explain the important vapor transport that occurred in the Valley of Ten Thousand Smokes fumaroles following emplacement of the ignimbrite. C1 ARIZONA STATE UNIV, TEMPE, AZ 85297 USA. RP WESTRICH, HR (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RI Eichelberger, John/H-6199-2016 NR 17 TC 41 Z9 41 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD AUG PY 1991 VL 18 IS 8 BP 1561 EP 1564 DI 10.1029/91GL01667 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000048 ER PT J AU DAILY, W OWEN, E AF DAILY, W OWEN, E TI CROSS-BOREHOLE RESISTIVITY TOMOGRAPHY SO GEOPHYSICS LA English DT Article ID IMPEDANCE-COMPUTED-TOMOGRAPHY; GEOPHYSICAL TOMOGRAPHY AB Electrical resistivity tomography (ERT) is a method for determining the electrical resistivity distribution in a volume from discrete measurements of current and voltage made within the volume or on its surface. We have developed an ERT algorithm that is an iterative, modified least squares inversion, based on a finite element forward solution of Laplace's equation. We report the results of tests on this algorithm designed to determine how resistance measurements made from two boreholes may be used to image the resistivity distribution between them. A number of simple but geophysically significant structures are modeled. These include a single isolated block anomaly, two layers, a thin isolated continuous layer, and a vertical band. The main features of most resistivity models were identifiable in the reconstructions. Limited data accuracy and noise were simulated and found to cause a deterioration of the image. However, even with measurements of only one significant figure accuracy, the algorithm converged toward the desired solution for at least the first iteration and the targets were identifiable in the reconstructions. Imprecision in the data influences convergence as well as image quality; more iterations eventually lead to divergence. Spatial resolution depends on such factors as data errors and the specific target geometry. RP DAILY, W (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 19 TC 87 Z9 95 U1 1 U2 11 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD AUG PY 1991 VL 56 IS 8 BP 1228 EP 1235 DI 10.1190/1.1443142 PG 8 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FZ996 UT WOS:A1991FZ99600010 ER PT J AU VOELZ, GL LAWRENCE, JNP AF VOELZ, GL LAWRENCE, JNP TI A 42-Y MEDICAL FOLLOW-UP OF MANHATTAN PROJECT PLUTONIUM WORKERS SO HEALTH PHYSICS LA English DT Article ID MORTALITY; CANCER AB Twenty-six white male subjects, who worked with plutonium (Pu-239) during World War II at Los Alamos, have been given medical examinations periodically over a period of 42 y to identify potential health effects. Inhalation was the primary mode of Pu exposures. The latest examinations, including urine bioassay and in-vivo measurements for radioactivity, were performed in late 1986 and 1987. The average age of the 22 living subjects in 1986 was 66 y. The diseases and physical changes noted in these persons are characteristic of a male population in their 60s. Estimates of individual Pu depositions, including lung burdens, as of 1987 or at time of death range from 52 to 3180 Bq (1.4 to 86 nCi) with a median value of 500 Bq (13.5 nCi). Four persons from the original group had died as of 1987. The causes of death were lung cancer, myocardial infarction, accidental injury, and respiratory failure due to pneumonia/congestive heart failure. Expected deaths based on U.S. death rates of white males, adjusted for age and calendar year, are 9.2 based on U.S. rates (standardized mortality ratio = 0.41). Subsequent to 1987, three additional deaths occurred from atherosclerotic heart disease, lung cancer, and osteogenic sarcoma. The bone sarcoma case is discussed in terms of Pu exposure, the natural incidence of this disease, anatomical location of the tumor, and bone tumors observed in Pu-exposed dogs. Plutonium deposition in this man is estimated to have been below current radiation protection guidelines. RP VOELZ, GL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, MAIL STOP K404, LOS ALAMOS, NM 87545 USA. NR 26 TC 32 Z9 32 U1 1 U2 3 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 AUG PY 1991 VL 61 IS 2 BP 181 EP 190 DI 10.1097/00004032-199108000-00001 PG 10 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 FZ841 UT WOS:A1991FZ84100002 PM 1856080 ER PT J AU LAZO, EN ROESSLER, GS BERVEN, BA AF LAZO, EN ROESSLER, GS BERVEN, BA TI DETERMINATION OF URANIUM AND THORIUM CONCENTRATIONS IN UNPROCESSED SOIL SAMPLES SO HEALTH PHYSICS LA English DT Article ID SPECTRA AB An assay technique that directly determines the amount of U-238 and Th-232 in unprocessed, bulk soil samples has been developed. In this technique, a sample consisting of a 125-mL plastic bottle full of contaminated, moist, unprocessed soil is irradiated with gamma-rays from Co-57. Induced U and Th K-alpha fluorescent x rays are detected using a high-purity intrinsic germanium planar detector. Because of sample irradiation geometry, the fluorescent x-ray peaks lie on top of a large Compton backscatter peak. Spectral data are first fit to a combination polynomial and ERFc-step-function background that is subtracted from the peak data. The remaining peak data are fit to a Voigt Profile to properly determine peak area. The Voigt Profile, which is the convolution of the Gaussian response of the detector system and the Lorentzian energy distribution of x rays, describes the spectral peak better than a simple Gaussian distribution. A mathematical point-node model of the source-target-detector system, which includes fluorescent x-ray production by singly scattered Compton gamma-s, calculates the predicted x-ray peak area per Bq cm-3 of target contamination. Soil attenuation coefficients, which are measured for each sample, are used by the model to properly transport gamma-s and x rays through the soil sample. The sample U-238 and Th-232 concentrations are then calculated by dividing the measured peak areas by the model-predicted peak areas per Bq cm-3. No "soil standards," no assumptions about progeny equilibrium, and no sample preparation are required for this technique. C1 UNIV FLORIDA, CTR NUCL SCI 202, GAINESVILLE, FL 32611 USA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. NR 13 TC 2 Z9 2 U1 0 U2 0 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 AUG PY 1991 VL 61 IS 2 BP 231 EP 243 DI 10.1097/00004032-199108000-00007 PG 13 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 FZ841 UT WOS:A1991FZ84100008 PM 1856084 ER PT J AU WEIER, HUG KLEINE, HD GRAY, JW AF WEIER, HUG KLEINE, HD GRAY, JW TI LABELING OF THE CENTROMERIC REGION ON HUMAN CHROMOSOME-8 BY INSITU HYBRIDIZATION SO HUMAN GENETICS LA English DT Article ID CHRONIC MYELOID-LEUKEMIA; ALPHOID REPETITIVE DNA; SEQUENCE HETEROGENEITY; POLYCYTHEMIA-VERA; SATELLITE DNA; ABERRATIONS; PROBES; AMPLIFICATION; ORGANIZATION; NUCLEI AB Probe DNA that binds preferentially to the centromeric region of human chromosomes 8 was synthesized. Alpha satellite probe DNA molecules were selectively amplified from sorter-purified human chromosomes 8 by in vitro DNA amplification using the polymerase chain reaction (PCR). Probe labeling was performed during PCR by incorporation of biotinylated deoxyuridine. In situ hybridization of unpurified probe DNA comprised of alpha satellite monomer and higher molecular weight DNA fragments with metaphase chromosome spreads showed binding to the centromeric regions of numerous chromosomes. However, blocking with unlabeled total human alphoid DNA dramatically reduced crosshybridization to chromosomes other than 8. Under these conditions, the degenerate probe DNA allowed unambiguous visualization of domains occupied by centromeric DNA of chromosome 8 in metaphase spreads and interphase cell nuclei, thus greatly facilitating the detection of numerical chromosome aberrations in tumor cells. In situ hybridization of size-fractionated alpha satellite DNA identified the monomeric fraction as the major cause of crosshybridization. Alpha satellite dimers and higher molecular weight DNA fragments showed relatively high specificity for human chromosomes 8. C1 HANOVER MED SCH,HEMATOL & ONKOL ABT,W-3000 HANNOVER 61,GERMANY. RP WEIER, HUG (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,L-452,POB 5507,LIVERMORE,CA 94550, USA. FU NICHD NIH HHS [HD17665] NR 30 TC 44 Z9 45 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-6717 J9 HUM GENET JI Hum. Genet. PD AUG PY 1991 VL 87 IS 4 BP 489 EP 494 PG 6 WC Genetics & Heredity SC Genetics & Heredity GA GC432 UT WOS:A1991GC43200023 PM 1879835 ER PT J AU ANDERSON, F CHRISTENSEN, W FULLERTON, L KORTEGAARD, B AF ANDERSON, F CHRISTENSEN, W FULLERTON, L KORTEGAARD, B TI ULTRA-WIDE-BAND BEAMFORMING IN SPARSE ARRAYS SO IEE PROCEEDINGS-H MICROWAVES ANTENNAS AND PROPAGATION LA English DT Article DE ANTENNA (ARRAYS); RADAR; ANTENNAS (TIME DOMAIN) ID PULSES AB Transient radiated fields caused by impulsively excited apertures and aperture response caused by incident impulsive waves has been the subject of considerable research in acoustics. This research is also of importance to wide-band radar. Medical ultrasound steered phased arrays use transmitted pulses consisting of from one to three cycles of a damped sinusoid, which is similar to certain ultra-wideband radar systems. Related studies applied to wide-band radar transmitting a single cycle of a sine wave indicate that it may be possible to construct a steered phased array radar with ultra high resolution using very sparse array apertures. In narrowband phased arrays, grating lobe considerations require that the array elements be placed close together. In contrast, very sparse, ultra high resolution wide band arrays may be constructed without incurring grating lobe problems. C1 TIME DOMAIN SYST,HUNTSVILLE,AL 35810. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP ANDERSON, F (reprint author), IMPULSE IMAGING CORP,POB 1400,BERNALILLO,NM 87004, USA. NR 12 TC 26 Z9 27 U1 0 U2 3 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0950-107X J9 IEE PROC-H PD AUG PY 1991 VL 138 IS 4 BP 342 EP 346 PG 5 WC Optics SC Optics GA FZ756 UT WOS:A1991FZ75600014 ER PT J AU FAIDAS, H CHRISTOPHOROU, LG MCCORKLE, DL AF FAIDAS, H CHRISTOPHOROU, LG MCCORKLE, DL TI ELECTRON-TRANSPORT IN FAST DIELECTRIC LIQUIDS AT HIGH APPLIED ELECTRIC-FIELDS SO IEEE TRANSACTIONS ON ELECTRICAL INSULATION LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL CONF ON CONDUCTION AND BREAKDOWN IN DIELECTRIC LIQUIDS CY SEP 10-14, 1990 CL GRENOBLE, FRANCE SP IEEE, DIELECT & ELECT INSULAT SOC, CNRS, UNIV JOSEPH FOURIER, FRENCH ELECT BOARD, MAIRIE GRENOBLE, COUNSEIL GEN ISERE, LAB PHYS & MECH FLUIDS POITIERS ID TRANSIT-TIME DISPERSION; DRIFT VELOCITIES; EXCESS ELECTRONS; MOBILITIES; TETRAMETHYLSILANE; RANGES AB The drift velocity w of excess electrons as a function of the applied electric field E in liquid 2,2-dimethylpropane, tetramethylsilane (TMS), tetramethylgermanium, tetramethyltin, 2,2,4,4-tetramethylpentane (TMP) and in mixtures of TMS with TMP (mole ratio M = 1.31/1) and n-pentane (M = 102/1, 17/1 and 5.6/1) has been measured for E-values to approximately 1.4 x l0(5) V/cm. The thermal electron mobilities, the maximum measured w, and the corresponding (maximum) E values for these liquids and mixtures were, respectively, 71.5, 119.3, 114.7, 85.7, 31.8, 39.1, 118, 85, and 47.6 cm2/SV; 3.3, 7.2, 7.4, 6.0, 2.6, 3.2, 6.8, 6.8 and 4.9 x l0(6) cm/s; and 116, 125, 109, 75, 115, 105, 105, 145, and 145 kV/cm. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP FAIDAS, H (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37830, USA. NR 17 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 0018-9367 J9 IEEE T ELECTR INSUL PD AUG PY 1991 VL 26 IS 4 BP 568 EP 573 DI 10.1109/14.83671 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA GE339 UT WOS:A1991GE33900004 ER PT J AU HAWORTH, M ANDERSON, B CHRISTOFFERSON, J CREMER, D DOSS, K PLATT, R SIDLER, JD THODE, L AF HAWORTH, M ANDERSON, B CHRISTOFFERSON, J CREMER, D DOSS, K PLATT, R SIDLER, JD THODE, L TI OPERATION OF REPETITIVELY PULSED VIRTUAL CATHODE OSCILLATORS ON THE TEMPO PULSER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID RESONANT CAVITY; MICROWAVE AB The design and results for two repetitively pulsed virtual cathode oscillators operated in 1-Hz bursts using the 1-MV, 20-OMEGA-TEMPO pulser are presented. Performance characteristics include 300 MW/pulse of radiated microwave power in the TM02 mode for a 2.4-GHz device, while a 2:1 scale-up of the hardware was used to generate 70 MW/pulse of radiated power in the TM01 mode at 840 MHz. C1 DEF NUCL AGCY,ALBUQUERQUE,NM 87115. ROCKWELL POWER SERV,ALBUQUERQUE,NM 87106. SCI & ENGN ASSOC,ALBUQUERQUE,NM 87110. BALL SYST ENGN DIV,ALBUQUERQUE,NM 87112. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP HAWORTH, M (reprint author), SCI APPLICAT INT CORP,ALBUQUERQUE,NM 87106, USA. NR 16 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 AUG PY 1991 VL 19 IS 4 BP 655 EP 659 DI 10.1109/27.90312 PG 5 WC Physics, Fluids & Plasmas SC Physics GA GE845 UT WOS:A1991GE84500015 ER PT J AU PHAM, H AF PHAM, H TI OPTIMAL-DESIGN FOR A CLASS OF NONCOHERENT SYSTEMS SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Article DE NONCOHERENT SYSTEM; K-TO-L-OUT-OF-N SYSTEM; OPTIMAL DESIGN; OPTIMIZATION AB A (k-to-l)-out-of-n:G system is a noncoherent system in which "no fewer than k and no more than l" out of n units may function for the successful operation of the system. Examples of noncoherent systems are found in communication, multiprocessor and transportation systems. This class of noncoherent systems is very general and includes coherent systems, eg, parallel, series, and N-Modular Redundancy, as special cases. There is an optimal system-size which maximizes the mean system-profit. 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 6 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9529 J9 IEEE T RELIAB JI IEEE Trans. Reliab. PD AUG PY 1991 VL 40 IS 3 BP 361 EP 363 DI 10.1109/24.85457 PG 3 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA FZ972 UT WOS:A1991FZ97200021 ER PT J AU PHAM, H UPADHYAYA, SJ AF PHAM, H UPADHYAYA, SJ TI OPTIMAL-DESIGN OF FAULT-TOLERANT DISTRIBUTED SYSTEMS BASED ON A RECURSIVE ALGORITHM SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Article DE DISTRIBUTED SYSTEM; FAULT TOLERANCE; OPTIMIZATION; SYSTEM RELIABILITY AB This paper addresses the issue of optimal design (in terms of the number of processors) of a distributed system and is based on a recursive algorithm for fault tolerance (RAFT). The reliability and performance of the system using RAFT are determined as a function of reliability of individual processors and the number of fault modes in a processor. Also discussed are how to determine the design policies when the objective is to minimize the average system cost given the cost of each processor and the cost of the system failure. Several numerical examples illustrate the results. C1 SUNY BUFFALO,DEPT ELECT & COMP ENGN,BUFFALO,NY 14260. RP PHAM, H (reprint author), EG&G IDAHO INC,NATL ENGN LAB,POB 1625,MS-2406,IDAHO FALLS,ID 83415, USA. NR 4 TC 4 Z9 4 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9529 J9 IEEE T RELIAB JI IEEE Trans. Reliab. PD AUG PY 1991 VL 40 IS 3 BP 375 EP 379 DI 10.1109/24.85460 PG 5 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA FZ972 UT WOS:A1991FZ97200024 ER PT J AU SIMOS, N SADEGH, AM AF SIMOS, N SADEGH, AM TI AN INDIRECT BIM FOR STATIC ANALYSIS OF SPHERICAL-SHELLS USING AUXILIARY BOUNDARIES SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article ID SHALLOW SHELLS AB Boundary integral approaches, which are known for their mathematical sophistication and elegance as well as their ability to reduce the problem dimensions by one, suffer from drawbacks associated with their performance in the vicinity of the boundaries. Such behaviour is the result of the unavoidable, in most cases, discretization of the boundary on one hand, which consequently results in the reduction of the integral problem to an algebraic one, and of the tedious evaluation of singularities that are present in most kernels on the other. The sensitivity of solutions of shell problems using a special form of boundary integral method is studied. Such an approach hopes to achieve a better representation of the solution near the boundaries by utilizing fictitious surface lines of perform the kernel integrations. Lastly, the performance of the integral formulation is examined through some representative examples. C1 CUNY CITY COLL,NEW YORK,NY 10031. RP SIMOS, N (reprint author), BROOKHAVEN NATL LAB,DIV STRUCT ANAL,UPTON,NY 11973, USA. NR 14 TC 6 Z9 6 U1 0 U2 2 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 AUG PY 1991 VL 32 IS 2 BP 313 EP 325 DI 10.1002/nme.1620320206 PG 13 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA FY863 UT WOS:A1991FY86300005 ER PT J AU EVANS, G GREIF, R AF EVANS, G GREIF, R TI UNSTEADY 3-DIMENSIONAL MIXED CONVECTION IN A HEATED HORIZONTAL CHANNEL WITH APPLICATIONS TO CHEMICAL VAPOR-DEPOSITION SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article ID FLUID-MECHANICS; MATHEMATICAL-MODEL; MOCVD REACTORS; ROTATING-DISK; FLOW; GROWTH; PLATES; CVD AB The flow and heat transfer of a gas in a horizontal channel with a heated bottom surface, a cooled top surface, and adiabatic side walls is studied. Numerical solutions of the transient, three-dimensional Navier-Stokes and energy equations reveal that the fluid is unstable thermally for conditions of interest in chemical vapor deposition (CVD). The instability appears as a combination of transverse, traveling waves and longitudinal rolls. The unsteady nature of the flow and the heat transfer is shown for two Reynolds numbers, Re = uHBAR/nu-0 (5 and 10), Grashof number, Gr = g-epsilon-H-3/nu-0(2) = 5000, Prandtl number, Pr = nu-0/alpha-0 = 2/3, aspect ratios, L/H = 8 and W/H = 2, for the temperature ratio epsilon = (T(s) - T0)/T0 = 0.01, corresponding to constant property flow. The instability results in an increase in the average heat transfer from 15% to more than 40% above the fully developed condition in the absence of the instability. C1 UNIV CALIF BERKELEY, DEPT MECH ENGN, BERKELEY, CA 94720 USA. RP SANDIA NATL LABS, DIV COMPUTAT MECH, LIVERMORE, CA 94550 USA. NR 27 TC 29 Z9 30 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0017-9310 EI 1879-2189 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD AUG PY 1991 VL 34 IS 8 BP 2039 EP 2051 DI 10.1016/0017-9310(91)90215-Z PG 13 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA GB171 UT WOS:A1991GB17100014 ER PT J AU STANSFIELD, SA AF STANSFIELD, SA TI ROBOTIC GRASPING OF UNKNOWN OBJECTS - A KNOWLEDGE-BASED APPROACH SO INTERNATIONAL JOURNAL OF ROBOTICS RESEARCH LA English DT Article ID HANDS AB In this article we describe a general-purpose robotic grasping system for use in unstructured environments. Using computer vision and a compact set of heuristics, the system automatically generates the robot arm and hand motions required for grasping an unmodeled object. The utility of such a system is most evident in environments where the robot will have to grasp and manipulate a variety of unknown objects, but many of these manipulation tasks may be relatively simple. Examples of such domains are planetary exploration and astronaut assistance, undersea salvage and rescue, and nuclear waste clean-up. This work implements a two-stage model of grasping: stage one is an orientation of the hand and wrist and a ballistic reach toward the object; stage two is hand preshaping and adjustment. Visual features are first extracted from the unmodeled object. These features and their relations are used by an expert system to generate a set of valid reach/grasps for the object. These grasps are then used in driving the robot hand and arm to bring the fingers into contact with the object in the desired configuration. Experimental results are presented to illustrate the functioning of the system. RP STANSFIELD, SA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 25 TC 41 Z9 45 U1 0 U2 4 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD ST JOURNALS DEPT, CAMBRIDGE, MA 02142 SN 0278-3649 J9 INT J ROBOT RES JI Int. J. Robot. Res. PD AUG PY 1991 VL 10 IS 4 BP 314 EP 326 DI 10.1177/027836499101000402 PG 13 WC Robotics SC Robotics GA GA433 UT WOS:A1991GA43300002 ER PT J AU JANCARIK, J KIM, SH AF JANCARIK, J KIM, SH TI SPARSE-MATRIX SAMPLING - A SCREENING METHOD FOR CRYSTALLIZATION OF PROTEINS SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Note AB A set of screening conditions for initial experiments in protein crystallization has been developed, tested, and is herein presented. These solution and precipitant conditions are empirically derived based on known or published crystallization conditions of various proteins in the past, so as to sample as large a range of buffer, pH, additive and precipitant variables as possible, using small amounts of proteins. The 50 crystallization conditions have been tested on 15 previously crystallized proteins, all of which were also crystallized in at least one form by this screen. This method is also shown to be highly successful in the crystallization of proteins which had not previously been crystallized. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP JANCARIK, J (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 3 TC 1968 Z9 1987 U1 9 U2 83 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD AUG 1 PY 1991 VL 24 BP 409 EP 411 DI 10.1107/S0021889891004430 PN 4 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA GA083 UT WOS:A1991GA08300020 ER PT J AU WEBER, AH KURZEJA, RJ AF WEBER, AH KURZEJA, RJ TI NOCTURNAL PLANETARY BOUNDARY-LAYER STRUCTURE AND TURBULENCE EPISODES DURING THE PROJECT STABLE FIELD PROGRAM SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID DIFFUSION AB This paper summarizes the results of meteorological and dispersion measurements during Savannah River Laboratory's Project STABLE (Stable Boundary Layer Experiment) field program. The field program took place at the Savannah River site on three nights during 12-17 April 1988. Meteorological data were collected from a 304-m tower, an array of eight 60-m towers, two sodars, a tethersonde, and a sonic anemometer. Based on the classification scheme of Kurzeja et al. (1991) the first and third nights were classified as unsteady type IV nights because of the passage of microfronts on each night. The second night exhibited a continuous level of high turbulence with a weak surface-based inversion and was classified as a steady type III night. The third night was especially interesting because of the considerable directional wind shear with height and the occurrence of two turbulent episodes. The directional shear may have been related to the passage of a high pressure center during the night. The turbulent episodes lasted from 5 to 30 min and had a horizontal extent of at least 30 km. They were preceded by cooling near the surface and a shift to lower frequencies of the Brunt-Vaisala frequency N(BV). It is suggested that a decrease with time of N(BV) or an increase in the standard deviation of the vertical component of velocity (sigma-w) or sigma-w/N(BV) might be used to forecast the onset of turbulent episodes reaching the surface. Sulfur hexafluoride (SF6) tracer was released continuously during the experiments and measured 10-20 km downwind by a mobile continuous analyzer. The tracer transport was shown to be consistent with low-level winds on the 304-m tower, except on the third night. It was hypothesized that on the third night the spatial variability of the wind field was much more extreme than on the other nights and, hence, the winds from the 304-m tower did not reflect the true plume movement. A spatially averaged mean wind was more successful in explaining the observed horizontal plume movement. The wider-than-expected across-arc concentration distribution on the third night was attributed to continuously varying shear; whereas the occasional secondary maxima in the tracer pattern were due to discontinuities in the vertical wind shear. RP WEBER, AH (reprint author), WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER LAB,BLDG 773-A,ROOM A-1012,AIKEN,SC 29802, USA. NR 11 TC 17 Z9 18 U1 0 U2 2 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 AUG PY 1991 VL 30 IS 8 BP 1117 EP 1133 DI 10.1175/1520-0450(1991)030<1117:NPBLSA>2.0.CO;2 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GB987 UT WOS:A1991GB98700007 ER PT J AU GALLARDO, JC AF GALLARDO, JC TI RANDOM ERRORS IN IRON-DOMINATED MICROUNDULATORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FREE-ELECTRON LASERS; FIELD ERRORS; MICROWIGGLER; UNDULATORS AB We describe a mathematical model of errors in iron-dominated microundulators introduced by manufacturing (machining) tolerances of the pole pieces. Explicit expressions for the perturbation fields are derived. We use these fields in a simulation, to calculate the first, second, and phase integrals describing the effects on the electron trajectory in the wiggler. RP GALLARDO, JC (reprint author), BROOKHAVEN NATL LAB,CTR ACCELERATOR PHYS,UPTON,NY 11973, USA. OI Gallardo, Juan C/0000-0002-5191-3067 NR 17 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1991 VL 70 IS 3 BP 1115 EP 1120 DI 10.1063/1.349616 PG 6 WC Physics, Applied SC Physics GA GA100 UT WOS:A1991GA10000003 ER PT J AU ALEXANDER, DE WAS, GS REHN, LE AF ALEXANDER, DE WAS, GS REHN, LE TI THE HEAT-OF-MIXING EFFECT ON ION-INDUCED GRAIN-GROWTH SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID THIN-FILMS; METALLIC BILAYERS; 3D METALS; NI-AL; ALLOYS; ENTHALPIES; SYSTEMS; LIQUID; AU AB Irradiation experiments were conducted on multilayer (ML) and coevaporated (CO) thin films in order to examine the role that the heat-of-mixing (DELTA-H(mix) has in ion-induced grain growth. Room-temperature irradiations using 1.7-MeV Xe ions were performed in the High Voltage Electron Microscope at Argonne National Laboratory. The ML films (Pt-Ti, Pt-V, Pt-Ni, Au-Co, and Ni-Al) spanned a large range of calculated DELTA-H(mix) values. Comparison of grain growth rates between ML and CO films of a given alloy confirmed a heat-of-mixing effect. With the exception of the Pt-V system, differences in grain growth rates between ML and CO films varied according to the sign of the calculated DELTA-H(mix) of the system. Substantial variations in growth rates among CO alloy films experiencing similar displacement damage demonstrated that a purely collisional approach is inadequate for describing ion-induced grain growth. Therefore consideration must also be given to material-specific properties, such as cohesive energy. C1 UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109. RP ALEXANDER, DE (reprint author), ARGONNE NATL LAB,MSD-212,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 40 TC 21 Z9 21 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1991 VL 70 IS 3 BP 1252 EP 1260 DI 10.1063/1.349580 PG 9 WC Physics, Applied SC Physics GA GA100 UT WOS:A1991GA10000020 ER PT J AU HSUEH, CH BECHER, PF LACKEY, WJ AF HSUEH, CH BECHER, PF LACKEY, WJ TI THERMAL AND MECHANICAL INDUCED STRESSES IN SUPERCONDUCTING YBA2CU3OX COATINGS ON FIBERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; FILMS AB Thermal stresses induced during cooling from the fabrication temperature of a fiber with a noncubic superconducting ceramic coating are analyzed theoretically. The coating considered has a preferred crystallographic orientation such that the c axis of the coating material is perpendicular to the fiber surface which, in turn, results in different thermal expansion coefficients in the radial and the tangential directions in the coating. The thermal stresses are shown to result both from the mismatch between the fiber and the coating, and from the thermal expansion anisotropy of the coating. Stresses due to bending of the fiber/coating to form a superconducting component are also addressed. A critical radius of curvature of bending is obtained below which segmentation of the coating is predicted. C1 GEORGIA INST TECHNOL,ATLANTA,GA 30332. RP HSUEH, CH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Hsueh, Chun-Hway/G-1345-2011 NR 21 TC 11 Z9 11 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1991 VL 70 IS 3 BP 1337 EP 1344 DI 10.1063/1.349590 PG 8 WC Physics, Applied SC Physics GA GA100 UT WOS:A1991GA10000032 ER PT J AU SANFORD, TWL HALBLEIB, JA MCATEE, WH MIKKELSON, KA MOCK, RC POUKEY, JW WELCH, DR AF SANFORD, TWL HALBLEIB, JA MCATEE, WH MIKKELSON, KA MOCK, RC POUKEY, JW WELCH, DR TI TRANSPORT DYNAMICS OF A 19-MEV, 700-KA ELECTRON-BEAM IN A 10.8-M GAS CELL SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DIODE; FLOW AB Measurements and modeling show that the 19-MeV, 700-kA HERMES III electron beam can be stably transported over 10.8 m in a 65-cm diam drift cell filled with low-pressure air or N2. A pressure of 100 +/- 20 Torr maximizes the energy transport efficiency at 71 +/- 2.4%. At 100 Torr, the pressure is high enough to generate a net current sufficient to produce magnetic pinch forces that contain the radial oscillations of the beam, but low enough to prevent significant loss from inelastic collisions and beam instabilities. Comparison of the model results with the measurements show that the modeling be used to predict qualitatively beam behavior in the cell. C1 MISSION RES CORP,ALBUQUERQUE,NM 87106. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 31 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1991 VL 70 IS 3 BP 1778 EP 1792 DI 10.1063/1.349493 PG 15 WC Physics, Applied SC Physics GA GA100 UT WOS:A1991GA10000099 ER PT J AU GOLANSKI, A PARK, JL PENNYCOOK, SJ WHITE, CW AF GOLANSKI, A PARK, JL PENNYCOOK, SJ WHITE, CW TI LOW-TEMPERATURE MESOTAXY OF ION-BEAM SYNTHESIZED ERSI2 SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID RARE-EARTH SILICIDES; SCHOTTKY-BARRIER; 111 SI; METALS; GROWTH; FILMS AB High doses (7 x 10(16)-1.3 x 10(17)/cm2) of 170-keV Er+ ions were implanted into single-crystal Si at an implantation temperature of T(i) = 520-degrees-C. During Er implantation ErSi2 crystallizes as coherent precipitates within a crystalline Si matrix. During the subsequent annealing at 800-degrees-C a discontinuous buried layer of the single crystalline ErSi2 is formed. Implanted and annealed samples were subsequently reimplanted with 170-keV Er+ ions at 250 < T(i) < 520-degrees-C. The second implantation results in a mesotaxial growth of the previously formed buried single-crystal ErSi2 layer for implantation temperatures T(i) > 300-degrees-C where ion beam induced, defect mediated diffusion of Er atoms in the Si matrix occurs during the implantation process. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP GOLANSKI, A (reprint author), CTR NATL ETUD TELECOMMUN,BP 98,F-38240 MEYLAN,FRANCE. NR 12 TC 1 Z9 1 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1991 VL 70 IS 3 BP 1853 EP 1855 DI 10.1063/1.349504 PG 3 WC Physics, Applied SC Physics GA GA100 UT WOS:A1991GA10000111 ER PT J AU LEE, IS BUCHANAN, RA WILLIAMS, JM AF LEE, IS BUCHANAN, RA WILLIAMS, JM TI CHARGE-INJECTION DENSITIES OF IRIDIUM AND IRIDIUM-ION-IMPLANTED TI-6A1-4V WITH RELEVANCY TO NEURAL STIMULATION SO JOURNAL OF BIOMEDICAL MATERIALS RESEARCH LA English DT Note ID OXIDE-FILMS; ELECTROCHROMISM; MECHANISM; SURFACE C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP LEE, IS (reprint author), UNIV TENNESSEE,DEPT MAT SCI & ENGN,434 DAUGHERTY ENGN BLDG,KNOXVILLE,TN 37996, USA. NR 11 TC 12 Z9 12 U1 0 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-9304 J9 J BIOMED MATER RES JI J. Biomed. Mater. Res. PD AUG PY 1991 VL 25 IS 8 BP 1039 EP 1043 DI 10.1002/jbm.820250810 PG 5 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA FY245 UT WOS:A1991FY24500009 PM 1918107 ER PT J AU SONG, L MAESTRE, MF AF SONG, L MAESTRE, MF TI UNHOOKING DYNAMICS OF U-SHAPED DNA MOLECULE UNDERGOING GEL-ELECTROPHORESIS SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID ELECTRIC-FIELD; SEPARATION; INVERSION; REPTATION; MOBILITY; LENGTH; HIPS; UNIX AB It has been found that DNA molecules are often hooked around obstacles in a U-shaped configuration in gel electrophoresis. To understand the dynamics of the unhooking of U-shaped DNA molecules undergoing gel electrophoresis, we have examined the length changes of the longer and shorter arms of the U-shape as a function of time. Two types of unhooking have been found. In one type, the length changes of both arms are exponential in time but with different time constants. In another type, the length changes of the shorter arm is exponential and that of the longer one is linear with time. The interpretation is that the extent of stretch of the spring-like DNA chain decreases as the length difference between the two arms increases during the unhooking processes, and that the frictions at the pivot point can be relatively large depending upon the local structure of the gel. The friction coefficient at the pivot point is estimated to be nu-0 = (2.98 +/- 1.42) x 10(-5) g/sec. RP SONG, L (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,3307,70A,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NIAID NIH HHS [AI-08421] NR 20 TC 27 Z9 27 U1 0 U2 4 PU ADENINE PRESS INC PI GUILDERLAND PA PO BOX 355/340, GUILDERLAND, NY 12084 SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD AUG PY 1991 VL 9 IS 1 BP 87 EP 99 PG 13 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA GB881 UT WOS:A1991GB88100006 PM 1781950 ER PT J AU KRISHNA, KR BELL, AT AF KRISHNA, KR BELL, AT TI AN ISOTOPIC TRACER STUDY OF THE DEACTIVATION OF RU/TIO2 CATALYSTS DURING FISCHER-TROPSCH SYNTHESIS SO JOURNAL OF CATALYSIS LA English DT Article ID SUPPORTED RUTHENIUM CATALYSTS; CARBON-MONOXIDE HYDROGENATION; TRANSIENT-RESPONSE TECHNIQUES; CO HYDROGENATION; RU; SURFACE; SILICA; METALS; H-2; SELECTIVITY C1 UNIV CALIF BERKELEY, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. RP UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB, CTR ADV MAT, BERKELEY, CA 94720 USA. NR 42 TC 24 Z9 24 U1 1 U2 4 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9517 EI 1090-2694 J9 J CATAL JI J. Catal. PD AUG PY 1991 VL 130 IS 2 BP 597 EP 610 DI 10.1016/0021-9517(91)90139-U PG 14 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA FX304 UT WOS:A1991FX30400024 ER PT J AU IACHELLO, F LEVIATAN, A MENGONI, A AF IACHELLO, F LEVIATAN, A MENGONI, A TI ALGEBRAIC APPROACH TO MOLECULAR ROTATION VIBRATION-SPECTRA .3. INFRARED INTENSITIES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EIKONAL APPROACH; TRIATOMIC-MOLECULES; DIATOMIC-MOLECULES; DIPOLE-MOMENT; VIBRON MODEL; SCATTERING AB We suggest a form of the dipole operator to be used in the analysis of intensities of infrared transitions within the framework of the vibron model. We give the corresponding matrix elements in explicit form and discuss their qualitative features. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. ENTE NAZL ENERGIE ALTERNAT,I-40100 BOLOGNA,ITALY. RP IACHELLO, F (reprint author), YALE UNIV,CTR THEORET PHYS,NEW HAVEN,CT 06511, USA. RI Mengoni, Alberto/I-1497-2012 OI Mengoni, Alberto/0000-0002-2537-0038 NR 16 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 AUG 1 PY 1991 VL 95 IS 3 BP 1449 EP 1455 DI 10.1063/1.461058 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA106 UT WOS:A1991GA10600003 ER PT J AU SCHERER, NF CARLSON, RJ MATRO, A DU, M RUGGIERO, AJ ROMEROROCHIN, V CINA, JA FLEMING, GR RICE, SA AF SCHERER, NF CARLSON, RJ MATRO, A DU, M RUGGIERO, AJ ROMEROROCHIN, V CINA, JA FLEMING, GR RICE, SA TI FLUORESCENCE-DETECTED WAVE PACKET INTERFEROMETRY - TIME RESOLVED MOLECULAR-SPECTROSCOPY WITH SEQUENCES OF FEMTOSECOND PHASE-LOCKED PULSES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID OPTICAL RAMSEY FRINGES; SELECTIVE VIBRATIONAL-EXCITATION; UNIMOLECULAR REACTIONS; 2-PHOTON SPECTROSCOPY; SHAPE SYNTHESIS; NEON DISCHARGE; PICOSECOND; COHERENT; DYNAMICS; SYSTEMS AB We introduce a novel spectroscopic technique which utilizes a two-pulse sequence of femtosecond duration phase-locked optical laser pulses to resonantly excite vibronic transitions of a molecule. In contrast with other ultrafast pump-probe methods, in this experiment a definite optical phase angle between the pulses is maintained while varying the interpulse delay with interferometric precision. For the cases of in-phase, in-quadrature, and out-of-phase pulse pairs, respectively, the optical delay is controlled to positions that are integer, integer plus one quarter, and integer plus one half multiples of the wavelength of a selected Fourier component. In analogy with a double slit optical interference experiment, the two pulse experiments reported herein involve the preparation and quantum interference of two nuclear wave packet amplitudes in an excited electronic state of a molecule. These experiments are designed to be sensitive to the total phase evolution of the wave packet prepared by the initial pulse. The direct determination of wave packet phase evolution is possible because phase locking effectively transforms the interferogram to a frame which is referenced to the optical carrier frequency, thereby eliminating the high (optical) frequency modulations. This has the effect of isolating the rovibrational molecular dynamics. The phase locking scheme is demonstrated for molecular iodine. The excited state population following the passage of both pulses is detected as the resultant two-beam dependent fluorescence emission from the B state. The observed signals have periodically recurring features that result from the vibrational dynamics of the molecule on the electronically excited potential energy surface. In addition, coherent interference effects cause the magnitude and sign of the periodic features to be strongly modulated. The two-pulse phase-locked interferograms are interpreted herein by use of a simple analytic model, by first order perturbation theory and by quantum mechanical wave packet calculations. We find the form of the interferogram to be determined by the ground state level from which the amplitude originates, the deviation from impulsive preparation of the wave packet due to nonzero pulse duration, the frequency and anharmonicity of the target vibrational levels in the B state, and the detuning of the phase-locked frequency from resonance. The dependence of the interferogram on the phase-locked frequency and phase angle is investigated in detail. C1 UNIV CHICAGO,JAMES FRANCK INST,CHICAGO,IL 60637. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV NACL AUTONOMA MEXICO,INST FIS,MEXICO CITY 01000,DF,MEXICO. RP SCHERER, NF (reprint author), UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637, USA. NR 66 TC 482 Z9 485 U1 13 U2 82 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 1 PY 1991 VL 95 IS 3 BP 1487 EP 1511 DI 10.1063/1.461064 PG 25 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA106 UT WOS:A1991GA10600009 ER PT J AU KUDLA, K SCHATZ, GC WAGNER, AF AF KUDLA, K SCHATZ, GC WAGNER, AF TI A QUASI-CLASSICAL TRAJECTORY STUDY OF THE OH+CO REACTION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NEGATIVE ACTIVATION-ENERGIES; CURVED ARRHENIUS PLOTS; CHEMICAL-KINETICS; RATE CONSTANTS; OH; CO; TEMPERATURE; EIGENVALUES; DEPENDENCE; MOLECULES AB We present a quasiclassical trajectory study of the OH + CO reaction using a potential surface that has been derived from ab initio calculations. Among quantities that have been studied are cross sections for reaction and for HOCO complex formation, cross sections associated with reaction from excited vibrational and rotational states, product energy partitioning and CO2 vibrational-state distributions, HOCO lifetime distributions, and thermal and state-resolved rate constants. We also present the results of Rice-Ramsberger-Kassel-Marcus (RRKM) calculations, using the same potential-energy surface, of HOCO lifetimes and of reactive and complex formation rate constants. The trajectory results indicate that the dominant mechanism for reaction involves complex formation at low energies. However, a direct reaction mechanism is responsible for half the reactive cross section at higher energies. This leads to a rate constant that is weakly temperature dependent at low temperatures, and becomes strongly temperature dependent at high temperature. Our trajectory results agree with measured rates over a wide range of temperatures, but the trajectory results at low temperatures are dominated by classical "leak" through zero-point barriers, so this agreement may be somewhat fortuitous. Rate constants for nonreactive processes such as OH(v = 1) deactivation by CO that are controlled by the HOCO formation step are well above experiment (factor of 6), while rate constants for processes such as CO(v = 1) reaction with OH that are controlled by decay of HOCO into H + CO2 are much closer (factor of 2). This suggests that the entrance channel barrier on our surface is too loose while the exit barrier is accurate. The error in the entrance channel barrier is studied using RRKM, and it is found to be due to an incorrect out-of-plane bend potential in the analytical surface used. Modifying the potential so that it is more consistent with ab initio calculations leads to greatly improved HOCO formation rates. The RRKM rate constant for HOCO formation is in good agreement with trajectories, but the RRKM reactive rate constant is well below either the trajectory value or experiment. This reactive rate is found to be very sensitive to tunneling through the exit channel barrier, so that by changing the barrier frequency from the fitted surface value to one which is more consistent with ab initio calculations, overall rates in agreement with experiment are obtained. Our trajectory cross section for highly translationally and rotationally excited OH is over an order of magnitude smaller than a value reported by Wolfrum. HOCO lifetimes are in the 0.4-2.0 ps range, about equal to RRKM theory near threshold but dropping more slowly with energy. Both trajectory and RRKM lifetimes are below the values measured by picosecond methods. Product energy partitioning is dominated by conversion of the exit channel barrier energy into product translation. Product rotational excitation is strongly controlled by angular momentum constraints. Product vibrational distributions are colder than statistical, with a propensity towards simultaneous bend-stretch excitation and not pure stretch excitation. C1 ARGONNE NATL LAB,DIV CHEM,THEORET CHEM GRP,ARGONNE,IL 60439. RP KUDLA, K (reprint author), NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208, USA. NR 41 TC 129 Z9 129 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 1 PY 1991 VL 95 IS 3 BP 1635 EP 1647 DI 10.1063/1.461076 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA106 UT WOS:A1991GA10600022 ER PT J AU SEIDEMAN, T MILLER, WH AF SEIDEMAN, T MILLER, WH TI TRANSITION-STATE THEORY, SIEGERT EIGENSTATES, AND QUANTUM-MECHANICAL REACTION-RATES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RATE CONSTANTS; MOLECULAR VIBRATIONS; SYSTEMS; SCATTERING; KRAMERS AB The "good" action variables associated with a transition state (i.e., the saddle point of a potential energy surface), on which a general semiclassical transition state theory is based, are shown to be the semiclassical couterpart of the Siegert eigenvalues of the system. (Siegert eigenvalues are the complex eigenvalues of the Schrodinger equation with outgoing wave boundary conditions.) By using flux correlation functions, it is then shown how the exact quantum mechanical reaction rate can be expressed in terms of the Siegert eigenvalues (and eigenfunctions). Applications to some test problems show these Siegert-based rate expressions to be rapidly convergent with respect to the sum over Siegert states. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP SEIDEMAN, T (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 55 TC 115 Z9 115 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 1 PY 1991 VL 95 IS 3 BP 1768 EP 1780 DI 10.1063/1.461025 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA106 UT WOS:A1991GA10600034 ER PT J AU ATCHITY, GJ XANTHEAS, SS RUEDENBERG, K AF ATCHITY, GJ XANTHEAS, SS RUEDENBERG, K TI POTENTIAL-ENERGY SURFACES NEAR INTERSECTIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RULE AB The topographies of two potential energy surfaces are examined in the vicinity of their intersection. A brief account of the basic theory is given and the possible surface types are discussed explicitly. Two main patterns are found. One of these ("peaked") has the character of a tilted double cone in that the lower (upper) surface decreases (increases) in all directions from the intersection which is a point where an infinite number, in fact, all orthogonal trajectories emanate. The other pattern ("sloped") results when both surfaces are monotonically sloped and touch each other along the slope, with most orthogonal trajectories bypassing the intersection. When the latter pattern prevails, the intersection can lie on a steepest descent line which originates at a transition state and hence may qualify as a reaction path model. An intermediate pattern, involving a horizontal slope on both surfaces, is also possible. The topographical patterns also differ markedly with respect to the bunching on the steepest descent lines. In general, the latter tend to veer away from the intersection on the lower surface favoring bifurcations, but are funneled towards the intersection on the upper surface, making the vicinity of the intersection a region favoring radiationless transitions. The various cases are classified and illustrated through quantitative graphs of contours and orthogonal trajectories. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RP ATCHITY, GJ (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. RI Xantheas, Sotiris/L-1239-2015; OI Xantheas, Sotiris/0000-0002-6303-1037 NR 13 TC 353 Z9 353 U1 3 U2 40 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 1 PY 1991 VL 95 IS 3 BP 1862 EP 1876 DI 10.1063/1.461036 PG 15 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA106 UT WOS:A1991GA10600045 ER PT J AU GRUBER, JB BURRIEL, R WESTRUM, EF PLAUTZ, W METZ, G MA, XX BEAUDRY, BJ PALMER, PE AF GRUBER, JB BURRIEL, R WESTRUM, EF PLAUTZ, W METZ, G MA, XX BEAUDRY, BJ PALMER, PE TI THERMOPHYSICAL PROPERTIES OF THE LANTHANIDE SESQUISULFIDES .2. SCHOTTKY CONTRIBUTIONS AND MAGNETIC AND ELECTRONIC-PROPERTIES OF GAMMA-PHASE PR2S3, TB2S3, AND DY2S3 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TEMPERATURE HEAT-CAPACITIES; LATTICE; TRIHYDROXIDES; 350-K; GAMMA-ND2S3; SPECTRA AB Heat-capacity measurements by adiabatic equilibrium calorimetry are reported for gamma-phase Pr2S3, Tb2S3, and Dy2S3 between 5 and 350 K. Highly purified samples were prepared and their composition verified by chemical analysis. Precision lattice parameters were determined for each compound and are compared with literature values. The total heat capacity has been resolved into lattice, magnetic, and Schottky components by a volumetric approach. The experimental Schottky contributions accord with the calculated curves based on the crystal-field splitting of the 2S+1L(J) ground state of the lanthanide ions occupying sites of S4 symmetry in the Th3P4 lattice. The individual crystal-field electronic energy levels have been obtained in part from an analysis of the hot-band data observed in the absorption spectra of Pr2S3, Tb2S3, and Dy2S3, and from a calculated splitting in which the crystal-field parameters B(km), were determined from a lattice-sum calculation. Molar thermodynamic properties are reported for all three compounds. The entropy at 298.15 K {S0 - S0 (7 K)}, is 22.78R, 22.93R, and 23.36R, for gamma-phase Pr2S3, Tb2S3, and Dy2S3, respectively. C1 UNIV MICHIGAN,DEPT CHEM,ANN ARBOR,MI 48109. UNIV ZARAGOZA,CSIC,INST CIENCIA MAT ARAGON,E-50009 ZARAGOZA,SPAIN. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP GRUBER, JB (reprint author), SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192, USA. NR 38 TC 10 Z9 10 U1 2 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 1 PY 1991 VL 95 IS 3 BP 1964 EP 1972 DI 10.1063/1.460993 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA106 UT WOS:A1991GA10600055 ER PT J AU LEUNG, LY NORTH, GR AF LEUNG, LY NORTH, GR TI ATMOSPHERIC VARIABILITY ON A ZONALLY SYMMETRICAL LAND PLANET SO JOURNAL OF CLIMATE LA English DT Article AB Atmospheric variability on a zonally symmetric planet in the absence of external forcing anomalies is studied. With idealized boundary conditions such as the absence of ocean and topography, and by using perpetual equinox solar forcing, a 15-year long stationary time series of the atmosphere is simulated with the NCAR Community Climate Model (CCM0). This provides sufficient time samples for realistic study of the properties of the atmosphere. Zonally averaged and space-time statistics for the surface air temperature field on this planet are presented. Such statistics can serve as noise climatologies for climate sensitivity experiments, allowing the effects of changes of external forcing on the atmosphere to be assessed. In search of a simple statistical model for atmospheric variability, the space-time spectra obtained from the CCM simulation are fitted statistically with a stochastic energy balance model. The space-time spectra for three zonal wavenumbers are found to be fitted satisfactorily by the stochastic model with only five parameters (a heat diffusion coefficient, a constant zonal advection speed, a radiative damping constant, and two parameters for blue spatial noise amplitudes). The estimated parameters agree with previously obtained values. This suggests that useful statistics for large-scale atmospheric variability may be obtained from simple statistical models. With the method of analysis provided in this study, the ability of the stochastic model for describing atmospheric variability on a more realistic planet (including geography and seasonal cycle) can be tested. This may involve comparing space-time statistics from the stochastic model with observed quantities and by using empirical orthogonal functions as a basis set for expansion. RP LEUNG, LY (reprint author), PACIFIC NW LAB, DEPT ATMOSPHER SCI, K6-11,POB 999, RICHLAND, WA 99352 USA. RI North, Gerald/G-1019-2011 NR 0 TC 13 Z9 13 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8755 J9 J CLIMATE JI J. Clim. PD AUG PY 1991 VL 4 IS 8 BP 753 EP 765 DI 10.1175/1520-0442(1991)004<0753:AVOAZS>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GG462 UT WOS:A1991GG46200001 ER PT J AU CHAU, LK PORTER, MD AF CHAU, LK PORTER, MD TI SURFACE ISOELECTRIC POINT OF EVAPORATED SILVER FILMS - DETERMINATION BY CONTACT-ANGLE TITRATION SO JOURNAL OF COLLOID AND INTERFACE SCIENCE LA English DT Note ID ORGANIZED MOLECULAR ASSEMBLIES; OXIDIZED ALUMINUM SURFACE; NORMAL-ALKANOIC ACIDS; SOLID-SURFACES; BASE BEHAVIOR; MONOLAYERS C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. NR 23 TC 31 Z9 31 U1 1 U2 3 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 AUG PY 1991 VL 145 IS 1 BP 283 EP 286 DI 10.1016/0021-9797(91)90121-N PG 4 WC Chemistry, Physical SC Chemistry GA FX296 UT WOS:A1991FX29600027 ER PT J AU BEASON, JD KERSHAW, DS PRASAD, MK AF BEASON, JD KERSHAW, DS PRASAD, MK TI USING PHYSICAL INSIGHT - THE RELATIVISTIC COMPTON-SCATTERING KERNEL FOR RADIATIVE-TRANSFER SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Note C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BEASON, JD (reprint author), PHILLIPS LAB,DIV HIGH ENERGY PLASMA,KIRTLAND AFB,NM 87117, USA. NR 11 TC 2 Z9 2 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 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD AUG PY 1991 VL 95 IS 2 BP 497 EP 504 DI 10.1016/0021-9991(91)90287-U PG 8 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA FX297 UT WOS:A1991FX29700012 ER PT J AU MEI, Z MORRIS, JW SHINE, MC SUMMERS, TSE AF MEI, Z MORRIS, JW SHINE, MC SUMMERS, TSE TI EFFECTS OF COOLING RATE ON MECHANICAL-PROPERTIES OF NEAR-EUTECTIC TIN-LEAD SOLDER JOINTS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE TIN-LEAD SOLDER JOINTS; CREEP; FATIGUE LIFE; RELIABILITY; SUPERPLASTICITY AB This paper reports the results of a study on the effect of the cooling rate during solidification on the shear creep and low cycle shear fatigue behavior of 60 Sn/40 Pb solder joints, and on bulk solder tensile properties. Solder joints were made with three different initial microstructures by quenching, air-cooling and furnace-cooling. They have similar steady-state strain rates under creep at relatively high shear stresses (i.e. in the matrix creep region) but creep at quite different strain rates at lower shear stresses (i.e. in the grain boundary creep region). These results are ascribed to the refined grain size and less lamellar phase morphology that results on increasing the cooling rate. Tensile tests on bulk solders that were cold-worked, quenched and furnace-cooled show that a faster cooling rate decreases the ultimate strength and increases the ductility at low strain rates. The fatigue life of quenched solder joints is shown to be longer than that of the furnace-cooled joints. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. DIGITAL EQUIPMENT CORP,CUPERTINO,CA 95014. RP MEI, Z (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 22 TC 57 Z9 58 U1 0 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD AUG PY 1991 VL 20 IS 8 BP 599 EP 608 DI 10.1007/BF02669524 PG 10 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA GA266 UT WOS:A1991GA26600004 ER PT J AU GULWADI, SM NADELLA, RK HOLLAND, OW RAO, MV AF GULWADI, SM NADELLA, RK HOLLAND, OW RAO, MV TI RUTHERFORD BACKSCATTERING STUDIES ON HIGH-ENERGY SI-IMPLANTED INP SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE IMPLANTATION; RUTHERFORD BACKSCATTERING; INP ID TRANSFERRED-ELECTRON OSCILLATORS; TEMPERATURE; FE; DAMAGE AB High-energy Si-implantations into InP:Fe were examined using Rutherford backscattering (RBS) via channeling measurements. Variable-fluence implantations at 3 MeV and variable-energy implantations for a fluence of 3 x 10(14) cm-2 were done. A damage-study on the 3 MeV Si-implanted samples by RBS indicated formation of a continuous, buried amorphous layer for a fluence of almost-equal-to 5 x 10(14) cm-2. The quality of the crystal in the region of the amorphous layer was poor after annealing at any temperature (less-than-or-equal-to 900-degrees-C), indicating that the crystallization during annealing resulted in either a highly defective material or a polycrystal. For samples with damage below the continuous amorphous level, damage recovery is essentially independent of damage concentration. In the variable-energy-implanted samples, the region of damage moved deeper below the sample surface with increasing energy. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP GULWADI, SM (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 22 TC 14 Z9 14 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD AUG PY 1991 VL 20 IS 8 BP 615 EP 619 DI 10.1007/BF02669526 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA GA266 UT WOS:A1991GA26600006 ER PT J AU REEVES, GD BELIAN, RD FRITZ, TA AF REEVES, GD BELIAN, RD FRITZ, TA TI NUMERICAL TRACING OF ENERGETIC PARTICLE DRIFTS IN A MODEL MAGNETOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID INJECTION; 6.6-RE; ATS-5 AB We present results from a model developed to study the motion of impulsively injected energetic particles which become trapped in the Earth's magnetic field at geosynchronous orbit. The model is based on numerically solving the analytic expressions for the bounce average gradient and curvature drift in a model magnetic field. The predicted motion of trapped geosynchronous particles in the Tsyganenko and Usmanov (1982) model (TU-82) has characteristics which are not predicted by less sophisticated models. We investigate the motion of drifting particles predicted by the model under various conditions such as: Kp level, pitch angle, orientation of the magnetic field, and location of the origin of the drift shell. As a test of the predictions of the model, we apply it to observations of a substorm injection event which took place on October 16, 1983, and was observed by three geosynchronous satellites. The injection region for this event is found to span approximately 45-degrees from near midnight to near 2100 LT. We also report the existence of a "periphery" outside the central injection where either injected ions or electrons, but not both, are observed with dispersionless signitures. The internal consistency of the predictions of the structure of the injection region using remote observations from the three geostationary satellites and the TU-82 field model is found to be quite good. RP REEVES, GD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. RI Reeves, Geoffrey/E-8101-2011 OI Reeves, Geoffrey/0000-0002-7985-8098 NR 24 TC 79 Z9 80 U1 1 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD AUG 1 PY 1991 VL 96 IS A8 BP 13997 EP 14008 DI 10.1029/91JA01161 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FZ834 UT WOS:A1991FZ83400024 ER PT J AU GOSLING, JT THOMSEN, MF BAME, SJ ELPHIC, RC RUSSELL, CT AF GOSLING, JT THOMSEN, MF BAME, SJ ELPHIC, RC RUSSELL, CT TI OBSERVATIONS OF RECONNECTION OF INTERPLANETARY AND LOBE MAGNETIC-FIELD LINES AT THE HIGH-LATITUDE MAGNETOPAUSE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID POLAR-CAP CONVECTION; EARTHS MAGNETOSPHERE; DAYSIDE MAGNETOPAUSE; BOUNDARY-LAYER; PLASMA-FLOW; NORTHWARD; EVENTS; SHEAR; TAIL; RAIN AB Measurements made with the Fast Plasma Experiment on ISEE 2 in the vicinity of the high-latitude, dusk magnetopause near the terminator plane, at a time when the local magnetosheath and tail lobe magnetic fields were nearly oppositely directed, provide direct evidence for the reconnection of the open field lines of the tail lobes with the interplanetary magnetic field (IMF). The evidence consists primarily of observations of accelerated magnetosheath plasma flowing both tailward and sunward within the high-latitude magnetopause current layer. Observed speed changes at the magnetopause were of the order of twice the magnetosheath Alfven speed and were quantitatively consistent with the predictions of reconnection models. At times when the newly entering magnetosheath plasma observed at ISEE 2 was accelerated sunward a secondary beam of ions, presumably mirrored at low altitudes, was occasionally present. At times when the newly entering magnetosheath plasma observed by ISEE 2 was accelerated tailward a secondary beam of largely unaccelerated mantle plasma was occasionally present. Small plasma accelerations observed on reconnected field lines in the magnetosheath were associated with the presence of ions reflected at the magnetopause and moving at a speed of approximately twice the Alfven speed relative to the reminder of the magnetosheath plasma. Although previous work has anticipated that the re-reconnection of the open field lines of the tail lobes with the IMF would be associated with northward IMF in the magnetosheath, the present reconnection event was associated with a local magnetosheath IMF which had a small southward component. C1 UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. RP GOSLING, JT (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 32 TC 208 Z9 209 U1 1 U2 10 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 AUG 1 PY 1991 VL 96 IS A8 BP 14097 EP 14106 DI 10.1029/91JA01139 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FZ834 UT WOS:A1991FZ83400032 ER PT J AU AGGARWAL, PK MEANS, JL DOWNEY, DC HINCHEE, RE AF AGGARWAL, PK MEANS, JL DOWNEY, DC HINCHEE, RE TI USE OF HYDROGEN-PEROXIDE AS AN OXYGEN SOURCE FOR INSITU BIODEGRADATION .2. LABORATORY STUDIES SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article AB A review of the literature on hydrogen peroxide decomposition and stabilization identified several inorganic and organic compounds that are known to decrease the rate of decomposition of peroxide in simple systems. Phosphate, a commonly used stabilizer in groundwater applications, does not stabilize peroxide in the presence of enzymatic catalysts, primarily catalase, which are the most important catalysts of peroxide decomposition. In laboratory experiments, a variety of other peroxide stabilizers identified in the literature review also did not sufficiently stabilize peroxide. It is concluded that hydrogen peroxide may not be an efficient source of oxygen for in situ bioreclamation processes, at the Eglin Air Force Base, Florida site. RP AGGARWAL, PK (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI aggarwal, pradeep/C-8367-2016 OI aggarwal, pradeep/0000-0001-5970-1408 NR 0 TC 8 Z9 8 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD AUG PY 1991 VL 27 IS 3 BP 301 EP 314 DI 10.1016/0304-3894(91)80056-T PG 14 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FY509 UT WOS:A1991FY50900004 ER PT J AU CHIDAMBARIAH, V TRAVIS, CC TRABALKA, JR THOMAS, JK AF CHIDAMBARIAH, V TRAVIS, CC TRABALKA, JR THOMAS, JK TI A RELATIVE RISK INDEX FOR PRIORITIZATION OF INACTIVE UNDERGROUND-STORAGE TANKS SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article AB A relative risk index (RRI) is proposed for ranking the relative health risk potential of mixed liquid wastes in underground storage tanks (USTs) that are scheduled for remedial action. The RRI is defined as the number of reference volumes in the liquid volume of a tank. A reference volume is the amount of liquid a person must ingest over a lifetime to incur either a 10(-6) lifetime cancer risk or a noncarcinogenic reference dose level exceeding one. The RRI accounts for contaminant concentration, contaminant toxicity, and the tank's liquid volume. The higher the number of reference volumes in a tank, the higher the relative risk potential of the tank. The RRI may be incorporated into any of the existing hazard ranking systems used for UST remediation. C1 OAK RIDGE NATL LAB,DIV HLTH & SAFETY,OFF RISK ANAL,POB 2008,OAK RIDGE,TN 37831. 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 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD AUG PY 1991 VL 27 IS 3 BP 327 EP 337 DI 10.1016/0304-3894(91)80058-V PG 11 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FY509 UT WOS:A1991FY50900006 ER PT J AU ASFAW, B BEYENE, Y SEMAW, S SUWA, G WHITE, T WOLDEGABRIEL, G AF ASFAW, B BEYENE, Y SEMAW, S SUWA, G WHITE, T WOLDEGABRIEL, G TI FEJEJ - A NEW PALEOANTHROPOLOGICAL RESEARCH AREA IN ETHIOPIA SO JOURNAL OF HUMAN EVOLUTION LA English DT Article ID KOOBI FORA; TURKANA; KENYA C1 FAC MED SECTEUR NORD MARSEILLE,ANTHROPOL LAB,BLVD PIERRE DRAMARD,F-13326 MARSEILLE,FRANCE. RUTGERS STATE UNIV,DEPT ANTHROPOL,NEW BRUNSWICK,NJ 08903. KYOTO UNIV,PRIMATE RES INST,DEPT MORPHOL,KANRIN INUYAMA,AICHI 484,JAPAN. UNIV CALIF BERKELEY,DEPT ANTHROPOL,BERKELEY,CA 94720. UNIV CALIF LOS ALAMOS SCI LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. RP ASFAW, B (reprint author), NATL MUSEUMS ETHIOPIA,MINIST CULTURE & SPORTS AFFAIRS,POB 5717,ADDIS ABABA,ETHIOPIA. NR 20 TC 37 Z9 38 U1 1 U2 4 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0047-2484 J9 J HUM EVOL JI J. Hum. Evol. PD AUG PY 1991 VL 21 IS 2 BP 137 EP 143 DI 10.1016/0047-2484(91)90004-F PG 7 WC Anthropology; Evolutionary Biology SC Anthropology; Evolutionary Biology GA GA621 UT WOS:A1991GA62100004 ER PT J AU FONTAINE, TA AF FONTAINE, TA TI ESTIMATING PROBABILITIES OF EXTREME RAINFALLS - CLOSURE SO JOURNAL OF HYDRAULIC ENGINEERING-ASCE LA English DT Discussion C1 UNIV WISCONSIN,DEPT CIVIL & ENVIRONM ENGN,MADISON,WI 53706. RP FONTAINE, TA (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,POB 2008,OAK RIDGE,TN 37831, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASCE-AMER SOC CIVIL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9429 J9 J HYDRAUL ENG-ASCE JI J. Hydraul. Eng.-ASCE PD AUG PY 1991 VL 117 IS 8 BP 1094 EP 1094 DI 10.1061/(ASCE)0733-9429(1991)117:8(1094.2) PG 1 WC Engineering, Civil; Engineering, Mechanical; Water Resources SC Engineering; Water Resources GA FY167 UT WOS:A1991FY16700019 ER PT J AU UEHARA, Y NUMABE, A HIRAWA, N KAWABATA, Y IWAI, J ONO, H MATSUOKA, H TAKABATAKE, Y YAGI, S SUGIMOTO, T AF UEHARA, Y NUMABE, A HIRAWA, N KAWABATA, Y IWAI, J ONO, H MATSUOKA, H TAKABATAKE, Y YAGI, S SUGIMOTO, T TI ANTIHYPERTENSIVE EFFECTS OF CICLETANINE AND RENAL PROTECTION IN DAHL SALT-SENSITIVE RATS SO JOURNAL OF HYPERTENSION LA English DT Article DE CICLETANINE; DAHL RATS; PROSTAGLANDIN; KIDNEY; SALT-INDUCED HYPERTENSION; THROMBOXANE ID SMOOTH-MUSCLE CELLS; SPONTANEOUSLY HYPERTENSIVE RATS; VASCULAR PROSTACYCLIN; PROSTAGLANDINS; PLASMA; INJURY AB We designed experiments to reveal the antihypertensive properties of cicletanine, a novel antihypertensive drug, in Dahl salt-sensitive (Dahl-S) rats. Cicletanine (39 mg/kg body weight per day for 6 weeks) ameliorated the development of hypertension in Dahl-S rats fed a high-salt (4% NaCl) diet. This blood pressure reduction was associated with a decrease in heart weight and vascular wall thickness. Moreover, urinary prostacyclin (PGI2) excretion was increased with cicletanine treatment, being inversely related to systolic blood pressure. Proteinuria and urinary excretion of n-acetyl-beta-D-glucosaminidase were decreased and glomerular filtration rate was increased with this treatment. Morphological investigation revealed an improvement in glomerulosclerosis, renal tubular damage and intrarenal arterial injury in the salt-induced hypertensive rats. In contrast, trichloromethiazide, which decreased blood pressure to the same extent as cicletanine, lowered urinary PGI2 excretion and generally did not ameliorate the deteriorated renal functions and morphological abnormalities. Thus, these data indicate that cicletanine ameliorates the development of hypertension in Dahl-S rats and protects the cardiovascular and renal systems against the injuries seen in the hypertension. The enhanced vasodepressor PGI2 synthesis probably participates, to some extent, in these beneficial properties of long-term cicletanine treatment. C1 DOKKYO UNIV,KOSHIGAYA HOSP,SCH MED,DEPT MED,DIV HYPERTENS & CARDIORENAL DIS,MIBU,TOCHIGI 32102,JAPAN. DOKKYO UNIV,KOSHIGAYA HOSP,SCH MED,DEPT MED,DIV CARDIOL,MIBU,TOCHIGI 32102,JAPAN. YOKOHAMA CITY UNIV,DEPT MED 2,MINAMI KU,YOKOHAMA,KANAGAWA 232,JAPAN. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP UEHARA, Y (reprint author), UNIV TOKYO,DEPT MED 2,7-3-1 HONGO,BUNKYO KU,TOKYO 113,JAPAN. NR 29 TC 41 Z9 41 U1 0 U2 0 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0263-6352 J9 J HYPERTENS JI J. Hypertens. PD AUG PY 1991 VL 9 IS 8 BP 719 EP 728 DI 10.1097/00004872-199108000-00005 PG 10 WC Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA GB154 UT WOS:A1991GB15400005 PM 1655882 ER PT J AU BEHNIA, K TAILLEFER, L FLOUQUET, J JACCARD, D MAKI, K FISK, Z AF BEHNIA, K TAILLEFER, L FLOUQUET, J JACCARD, D MAKI, K FISK, Z TI THERMAL-CONDUCTIVITY OF SUPERCONDUCTING UPT3 SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID UPPER CRITICAL-FIELD; PHASE-DIAGRAM; ANISOTROPIC SUPERCONDUCTORS; ULTRASONIC-ATTENUATION; TEMPERATURE-DEPENDENCE; TRANSPORT-PROPERTIES; MAGNETIC-FIELD; RELAXATION; TRANSITION AB The thermal conductivity-kappa of the heavy-fermion superconductor UPt3 has been measured on two single crystals of different quality as a function of temperature and applied magnetic field for different orientations of the heat current relative to both the field and the crystalline axes. The temperature dependence of kappa is far from exponential and nearly the same for both crystals, in which the heat current is, respectively, parallel and perpendicular to the hexagonal c axis, suggesting a gap structure with nodes in the basal plane and normal to it. The field dependence of kappa is strongly anisotropic. In the best sample at low fields, where the scattering of heat carriers by vortices is thought to be important, kappa(H) depends on the relative orientation of field and current. On the other hand, at high fields near H(c2) (in both samples), kappa(H) depends on the relative orientation of field and crystalline axes, reflecting an anisotropy in the gap structure and in the Fermi velocities. C1 CNRS,CTR RECH TRES BASSES TEMP,F-38042 GRENOBLE,FRANCE. UNIV SO CALIF,DEPT PHYS,LOS ANGELES,CA 90089. UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. RP BEHNIA, K (reprint author), UNIV GENEVA,DEPT PHYS MAT CONDENSEE,24 QUAI ERNEST ANSERMENT,CH-1211 GENEVA 4,SWITZERLAND. NR 28 TC 38 Z9 38 U1 0 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD AUG PY 1991 VL 84 IS 3-4 BP 261 EP 278 DI 10.1007/BF00683610 PG 18 WC Physics, Applied; Physics, Condensed Matter SC Physics GA GJ523 UT WOS:A1991GJ52300005 ER PT J AU SCHNEIBEL, JH GEORGE, EP MCKAMEY, CG OHRINER, EK SANTELLA, ML CARMICHAEL, CA AF SCHNEIBEL, JH GEORGE, EP MCKAMEY, CG OHRINER, EK SANTELLA, ML CARMICHAEL, CA TI FABRICATION AND TENSILE PROPERTIES OF CONTINUOUS-FIBER REINFORCED NI3AL-AL2O3 COMPOSITES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID NI3AL AB Continuous-fiber reinforced metal-matrix composites consisting of Ni3Al alloys and Saphikon Al2O3 single crystal fibers were fabricated by hot-pressing of fiber-foil lay-ups. Two matrix compositions were employed, namely, IC50 (Ni-22.5Al-0.5Zr-0.1B, at.%) and IC396M (Ni-15.9Al-8.0Cr-0.5Zr-1.7Mo-0.02B, at.%). Etching of the foils in aqueous FeCl3 solution prior to lay-up and hot-pressing tended to improve fiber-matrix bonding and the density-normalized room temperature yield stress. Whereas strength improvements for the IC50 matrix were only moderate, significant improvements were found for an IC396M composite reinforced with 10 vol. % of Saphikon fibers. RP SCHNEIBEL, JH (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI George, Easo/L-5434-2014 NR 9 TC 19 Z9 19 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 AUG PY 1991 VL 6 IS 8 BP 1673 EP 1679 DI 10.1557/JMR.1991.1673 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA GA521 UT WOS:A1991GA52100010 ER PT J AU MCKAMEY, CG DEVAN, JH TORTORELLI, PF SIKKA, VK AF MCKAMEY, CG DEVAN, JH TORTORELLI, PF SIKKA, VK TI A REVIEW OF RECENT DEVELOPMENTS IN FE3AL-BASED ALLOYS SO JOURNAL OF MATERIALS RESEARCH LA English DT Review ID FE-AL ALLOYS; IRON-ALUMINUM-ALLOYS; ROOM-TEMPERATURE DUCTILITY; DO3 ORDER PARAMETERS; HYDROGEN EMBRITTLEMENT; ENVIRONMENTAL EMBRITTLEMENT; SULFIDATION PROPERTIES; TENSILE PROPERTIES; FRACTURE-BEHAVIOR; YTTRIUM ADDITIONS AB Fe3Al-based iron aluminides have been of interest for many years because of their excellent oxidation and sulfidation resistance. However, limited room temperature ductility (< 5%) and a sharp drop in strength above 600-degrees-C have limited their consideration for use as structural materials. Recent improvements in tensile properties, especially improvements in ductility produced through control of composition and microstructure, and advances in the understanding of environmental embrittlement in intermetallics, including iron aluminides, have resulted in renewed interest in this system for structural applications. The purpose of this paper is to summarize recent developments concerning Fe3Al-based aluminides, including alloy development efforts and environmental embrittlement studies. This report will concentrate on literature published since about 1980, and will review studies of fabrication, mechanical properties, and corrosion resistance that have been conducted since that time. RP MCKAMEY, CG (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. RI Tortorelli, Peter/E-2433-2011 NR 173 TC 579 Z9 615 U1 6 U2 49 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 AUG PY 1991 VL 6 IS 8 BP 1779 EP 1805 DI 10.1557/JMR.1991.1779 PG 27 WC Materials Science, Multidisciplinary SC Materials Science GA GA521 UT WOS:A1991GA52100025 ER PT J AU MOORHEAD, AJ KIM, HE AF MOORHEAD, AJ KIM, HE TI OXIDATION BEHAVIOR OF TITANIUM-CONTAINING BRAZING FILLER METALS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID COPPER; CERAMICS; ALUMINA AB Brazements on alumina or partially stabilized zirconia (PSZ) of four silver- or copper-based brazing filler metals that contain titanium to promote wetting of and adherence to structural ceramics, were exposed in a thermogravimetric analyser at temperatures up to 700-degrees-C to atmospheres of 100% O2, Ar-20% O2 and Ar-3 p.p.m. O2. The alloys included Cu-41.1Ag-3.6Sn-7.2Ti, Ag-44.4Cu-8.4Sn-0.9Ti, Ag-41.6Cu-9.7Sn-5.0Ti and Ag-37.4Cu-10.8In-1.4Ti, at %. All formed external oxides that were more or less protective under all of the test conditions studied. The growth of the oxides followed a parabolic time law. The gains in weight due to oxidation observed were small, ranging (for 45 h exposure at 400-degrees-C to Ar-20% O2) from 0.20 mg cm-2 for the Ag-37.4Cu-10.8In-1.4Ti alloy to 0.46 mg cm-2 for Cu-41.1Ag-3.6Sn-7.2Ti. As expected, weight gain increased with increasing temperature or P(O2). Unexpectedly, the titanium played a minor role in the scale formed on any of the filler metals with a titanium oxide, TiO2, being found on only one alloy - Ag-41.6Cu-9.7Sn-5.0Ti. The brazements on PSZ gained weight at a higher rate than comparative brazements on alumina. We attribute this behaviour to oxygen transport through the zirconia resulting in the growth of an interfacial layer of titanium oxide. RP MOORHEAD, AJ (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 23 TC 9 Z9 9 U1 1 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD AUG 1 PY 1991 VL 26 IS 15 BP 4067 EP 4075 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA GB162 UT WOS:A1991GB16200013 ER PT J AU BONSE, U NUSHARDT, R BUSCH, F PAHL, R KINNEY, JH JOHNSON, QC SAROYAN, RA NICHOLS, MC AF BONSE, U NUSHARDT, R BUSCH, F PAHL, R KINNEY, JH JOHNSON, QC SAROYAN, RA NICHOLS, MC TI X-RAY TOMOGRAPHIC MICROSCOPY OF FIBER-REINFORCED MATERIALS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID MICROTOMOGRAPHY AB Aluminium composites containing Al2O3 fibres and precipitates of various intermetallic phases are investigated by high-resolution computerized microtomography. Individual fibres 15-mu-m in diameter and intermetallic phases forming a network with about 15-mu-m mesh size have been imaged. The capabilities of the method and its further development down 1-mu-m and less spatial resolution are discussed. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. SANDIA NATL LABS,LIVERMORE,CA 94550. RP BONSE, U (reprint author), UNIV DORTMUND,INST PHYS,W-4600 DORTMUND,GERMANY. NR 16 TC 42 Z9 42 U1 1 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD AUG 1 PY 1991 VL 26 IS 15 BP 4076 EP 4085 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA GB162 UT WOS:A1991GB16200014 ER PT J AU TRATNIK, MV AF TRATNIK, MV TI SOME MULTIVARIABLE ORTHOGONAL POLYNOMIALS OF THE ASKEY TABLEAU - CONTINUOUS FAMILIES SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID HAHN POLYNOMIALS AB A multivariable generalization is presented for all the continuous families of the Askey tableau. This significantly extends some previously known multivariable Jacobi polynomials. The latter are recovered as a limit case from a family of multivariable continuous Hahn polynomials which in turn are obtained as a limit of some multivariable Wilson polynomials. A continuous analog of the single variable Charlier polynomials is also introduced. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP TRATNIK, MV (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 16 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD AUG PY 1991 VL 32 IS 8 BP 2065 EP 2073 DI 10.1063/1.529228 PG 9 WC Physics, Mathematical SC Physics GA FY181 UT WOS:A1991FY18100014 ER PT J AU WELLER, RE BUSCHBOM, RL MARTELL, SL BAER, JF MALAGA, CA RAGAN, HA AF WELLER, RE BUSCHBOM, RL MARTELL, SL BAER, JF MALAGA, CA RAGAN, HA TI TOTAL SERUM CREATINE-KINASE AND ISOZYME CONCENTRATIONS IN THE OWL MONKEY SO JOURNAL OF MEDICAL PRIMATOLOGY LA English DT Article DE OWL MONKEY; CREATINE KINASE; ISOZYME ID CHEMISTRY; VALUES; AOTUS AB Serum samples from 62 owl monkeys were analyzed to determine concentrations of creatine kinase activity and isozymes. Fifty monkeys were determined to be clinically normal, while twelve had cardiac disease. Findings showed that the data had a non-normal distribution. Based on nonparametric tests, significant differences were not observed between sexes or animals with and without cardiac disease, indicating that CK activity and isozymes are not reliable indicators of myocardial disease in the owl monkey. Reference values presented are only intended as a guide. Each laboratory should determine its own reference values. RP WELLER, RE (reprint author), PACIFIC NW LAB, DEV TOXICOL SECT, P7-50, POB 999, RICHLAND, WA 99352 USA. NR 27 TC 1 Z9 1 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0047-2565 J9 J MED PRIMATOL JI J. Med. Primatol. PD AUG PY 1991 VL 20 IS 6 BP 290 EP 294 PG 5 WC Veterinary Sciences; Zoology SC Veterinary Sciences; Zoology GA GN899 UT WOS:A1991GN89900003 PM 1757971 ER PT J AU GOLDBERG, P MILONNI, PW SUNDARAM, B AF GOLDBERG, P MILONNI, PW SUNDARAM, B TI LASER LINEWIDTH - AMPLIFICATION OF VACUUM FLUCTUATIONS AND EFFECTS OF SPATIAL HOLE BURNING SO JOURNAL OF MODERN OPTICS LA English DT Letter ID EXCESS SPONTANEOUS EMISSION; HERMITIAN OPTICAL-SYSTEMS; LONGITUDINAL EIGENMODES; AMPLIFIERS; NONORTHOGONALITY; OUTPUT; NOISE AB The theory of the fundamental laser linewidth as expressed by the Schawlow-Townes formula is extended to include the amplification of vacuum field fluctuations as well as spatial hole burning. We give a physical interpretation of the Petermann K factor and a simple derivation that does not invoke non-orthogonality of cavity modes. Spatial hole burning introduces directional gain and reduces the output intensity, leading to an increase in the laser linewidth and a modified K factor for asymmetric cavities. C1 UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. CUNY COLL STATEN ISL, STATEN ISL, NY 10301 USA. RP UNIV CALIF LOS ALAMOS SCI LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA. RI Sundaram, Bala/A-6532-2010 OI Sundaram, Bala/0000-0002-1728-704X NR 17 TC 17 Z9 17 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND SN 0950-0340 EI 1362-3044 J9 J MOD OPTIC JI J. Mod. Opt. PD AUG PY 1991 VL 38 IS 8 BP 1421 EP 1427 DI 10.1080/09500349114551591 PG 7 WC Optics SC Optics GA GA804 UT WOS:A1991GA80400002 ER PT J AU LARSON, EM ELLISON, AJG LYTLE, FW NAVROTSKY, A GREEGOR, RB WONG, J AF LARSON, EM ELLISON, AJG LYTLE, FW NAVROTSKY, A GREEGOR, RB WONG, J TI XAS STUDY OF LANTHANUM COORDINATION ENVIRONMENTS IN GLASSES OF THE SYSTEM K2O-SIO2-LA2O3 SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID EARTH ELEMENTS; EXAFS; GD AB The La L1 and L3 XANES and L3 EXAFS have been investigated for the series of glasses 10K2O-50SiO2-xLa2O3 (x = 1, 5, 10) and (10 - x)K2O-40SiO2-(x/3)La2O3 (x = 7.5, 5, 2.5) and model compounds La2O3, LaAlO3, LaPO4, La2NiO4, La2CuO4 and La(OH)3. An edge resonance at approximately 25 eV above the L1 edge in the glass spectra is concentration-dependent, decreasing in intensity with increasing lanthanum concentration. The 2s --> nd forbidden transition increases with La2O3 concentration, indicating a reduction in the 'average' site symmetry of the first coordination shell of La. Mapping chi(k) space, which is a new and promising technique, was employed to extract bond distance, coordination number and thermal parameters from the EXAFS. By this method, one calculates the complete chi(k) space as a function of all physically reasonable values of the adjusted parameters in all possible combinations. The advantage in this method is the assurance of a global minimum. Bond lengths were comparable to those obtained by Fourier transforming the phase corrected EXAFS. The values are 2.42 angstrom (+/- 0.03 angstrom) for La-O. The coordination numbers (N less-than-or-equal-to 7 +/- 1.5) were derived by mapping and comparison to the published structures for other La compounds. Chi(k) mapping is compared with least-squares fitting the data, and the correlation between the Debye-Waller factor and coordination number is also discussed. C1 PRINCETON UNIV,DEPT GEOL & GEOPHYS SCI,PRINCETON,NJ 08544. BOEING CO,SEATTLE,WA 98124. RP LARSON, EM (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 27 TC 27 Z9 27 U1 1 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD AUG PY 1991 VL 130 IS 3 BP 260 EP 272 DI 10.1016/0022-3093(91)90363-B PG 13 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FZ508 UT WOS:A1991FZ50800007 ER PT J AU HAGLUND, RF MOGUL, HC WEEKS, RA ZUHR, RA AF HAGLUND, RF MOGUL, HC WEEKS, RA ZUHR, RA TI CHANGES IN THE REFRACTIVE-INDEX OF FUSED-SILICA DUE TO IMPLANTATION OF TRANSITION-METAL IONS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Letter AB The changes in the refractive index of high purity silica glass produced by implantation of Ti+, Cr+, Mn+, Fe+ and Cu+ ions at 160 keV were measured using ellipsometry at a wavelength of 633 nm. Implantation doses ranged from 10(15) to 6 X 10(16) ions cm-2. At the highest doses, a relative increase in refractive index of approximately 15% for implanted Cu ions and an increase of about half that for implanted Cr, Mn and Fe ions are observed. These variations in index probably result from colloid formation. For implanted Ti, virtually no change in the measured index of refraction was observed even at the highest doses. C1 VANDERBILT UNIV,DEPT MAT SCI & ENGN,NASHVILLE,TN 37235. OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP HAGLUND, RF (reprint author), VANDERBILT UNIV,DEPT PHYS & ASTRON,NASHVILLE,TN 37235, USA. NR 21 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD AUG PY 1991 VL 130 IS 3 BP 326 EP 331 DI 10.1016/0022-3093(91)90371-C PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FZ508 UT WOS:A1991FZ50800015 ER PT J AU WEBER, WJ MANSUR, LK CLINARD, FW PARKIN, DM AF WEBER, WJ MANSUR, LK CLINARD, FW PARKIN, DM TI RADIATION EFFECTS ON MATERIALS IN HIGH-RADIATION ENVIRONMENTS - A WORKSHOP SUMMARY SO JOURNAL OF NUCLEAR MATERIALS LA English DT Editorial Material ID PU-SUBSTITUTED ZIRCONOLITE; ENHANCED MATERIALS SCIENCE; NUCLEAR-POWER TECHNOLOGY; DISPLACEMENT CASCADES; IRRADIATED MATERIALS; RADIOACTIVE-WASTE; AMORPHIZATION; DEFECTS; DAMAGE; SPECTRUM AB A workshop on Radiation Effects on Materials in High-Radiation Environments was held in Salt Lake City, Utah (USA) from August 13 to 15, 1990 under the auspices of the Division of Material Sciences, Office of Basic Energy Sciences. US Department of Energy. The workshop focused on ceramics, alloys, and intermetallics and covered research needs and capabilities, recent experimental data, theory, and computer simulations. It was concluded that there is clearly a continuing scientific and technological need for fundamental knowledge on the underlying causes of radiation-induced property changes in materials. Furthermore, the success of many current and emerging nuclear-related technologies critically depend on renewed support for basic radiation-effects research, irradiation facilities, and training or scientists. The highlights of the workshop are reviewed and specific recommendations are made regarding research needs. C1 OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV CALIF LOS ALAMOS SCI LAB, LOS ALAMOS, NM 87545 USA. RP WEBER, WJ (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. RI Weber, William/A-4177-2008 OI Weber, William/0000-0002-9017-7365 NR 95 TC 29 Z9 29 U1 1 U2 8 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 AUG PY 1991 VL 184 IS 1 BP 1 EP 21 DI 10.1016/0022-3115(91)90527-E PG 21 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA FY202 UT WOS:A1991FY20200001 ER PT J AU LEIBOWITZ, L BLOMQUIST, RA AF LEIBOWITZ, L BLOMQUIST, RA TI THERMODYNAMICS AND PHASE-EQUILIBRIA OF THE IRON URANIUM SYSTEM SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Interest in metallic fuel for nuclear reactors has prompted studies of the thermodynamics and phase equilibria of several binary and ternary fuel alloys. Of particular interest are systems involving uranium-plutonium-zirconium alloy fuel and components of the stainless steel cladding. An experimental study and phase diagram calculation of the iron-uranium alloy system were performed. Thermodynamic functions for the existing phases were derived and a phase diagram was calculated that agrees reasonably with published diagrams. RP LEIBOWITZ, L (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 12 TC 15 Z9 15 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 AUG PY 1991 VL 184 IS 1 BP 47 EP 52 DI 10.1016/0022-3115(91)90531-B PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA FY202 UT WOS:A1991FY20200005 ER PT J AU LEIBOWITZ, L BLOMQUIST, RA PELTON, AD AF LEIBOWITZ, L BLOMQUIST, RA PELTON, AD TI THERMODYNAMIC MODELING OF THE PHASE-EQUILIBRIA OF THE PLUTONIUM URANIUM SYSTEM SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article ID ZIRCONIUM SYSTEM AB Interest in metallic fuel for nuclear reactors has prompted studies of the thermodynamics and phase equilibria of binary alloys containing uranium, plutonium, and zirconium. An analysis and phase diagram calculation of the plutonium-uranium alloy system were performed. Thermodynamic functions for all existing phases were derived and a phase diagram was calculated. The results generally agreed with the accepted phase diagram. Regions of disagreement are discussed. C1 ECOLE POLYTECH,MONTREAL H3C 3A7,QUEBEC,CANADA. RP LEIBOWITZ, L (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 10 TC 19 Z9 19 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 AUG PY 1991 VL 184 IS 1 BP 59 EP 64 DI 10.1016/0022-3115(91)90533-D PG 6 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA FY202 UT WOS:A1991FY20200007 ER PT J AU KENIK, EA INAZUMI, T BELL, GEC AF KENIK, EA INAZUMI, T BELL, GEC TI RADIATION-INDUCED GRAIN-BOUNDARY SEGREGATION AND SENSITIZATION OF A NEUTRON-IRRADIATED AUSTENITIC STAINLESS-STEEL SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article AB Analytical electron microscopy and electrochemical potentiokinetic reactivation (EPR) testing were applied to the radiation-induced segregation (RIS) and sensitization of a titanium-modified austenitic stainless steel neutron-irradiated to 9 dpa. The EPR testing of both solution annealed (SA) and 25% cold-worked (CW) materials indicated a significant increase in the reactivation charge (P(a)). Both optical and scanning electron microscopy of the specimen surface after EPR testing showed preferential attack at grain boundaries, indicative of sensitization. In addition, localized attack of the matrix was observed. Though precipitates were occasionally present on grain boundaries, they were not chromium-rich M23C6, but nickel- and silicon-enriched G phase. Faulted dislocation loops, small gamma'-precipitates, and isolated cavities were observed in the matrix. X-ray microanalysis showed significant RIS at high-angle boundaries in both materials. Depletion of chromium to apparent levels of 10 at% was observed in the irradiated SA material. The boundaries were enriched in nickel, silicon, and titanium to 28, 6, and 1 at%, respectively) and depleted of iron and molybdenum (as low as 54 and 0.7 at%, respectively). The width of the segregation zone was very narrow ( < 6 nm). Similar grain boundary RIS was observed in the cold-worked material. There was also evidence for boundary migration in the cold-worked material (boundary facetting and asymmetric composition profiles). Voids and faulted dislocation loops in the SA material also exhibited similar RIS. C1 JAPAN ATOM ENERGY RES INST,DEPT FUELS & MAT RES,TOKAI,IBARAKI 31911,JAPAN. RP KENIK, EA (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. NR 21 TC 23 Z9 23 U1 0 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 AUG PY 1991 VL 183 IS 3 BP 145 EP 153 DI 10.1016/0022-3115(91)90482-M PG 9 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA FX643 UT WOS:A1991FX64300003 ER PT J AU OSTER, ZH SOM, P WANG, GJ WEBER, DA AF OSTER, ZH SOM, P WANG, GJ WEBER, DA TI IMAGING OF COCAINE-INDUCED GLOBAL AND REGIONAL MYOCARDIAL-ISCHEMIA SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID NORMAL CORONARY-ARTERIES; INFARCTION; ABUSE; SPASM AB Severe and often fatal cardiac complications have been reported in cocaine users with narrowed coronary arteries caused by atherosclerosis as well as in young adults with normal coronaries. We have found that in normal dogs cocaine induces severe temporary hypoperfusion of the left ventricle as indicated by a significantly lower Tl-201 concentration compared to the baseline state. The most significant decrease in uptake occurred 5 min after injection and was more pronounced in the septal and apical segments. Following intravenous administration of cocaine, instead of gradual disappearance of Tl-201 from the left ventricle, there was continuous increase in Tl-201 concentration in the left ventricle. These imaging experiments indicate that the deleterious effects of cocaine on the heart are probably due to spasm of the coronaries and decreased myocardial perfusion. Since spasm of the large subpericardial vessels does not seem to explain the magnitude of the increased coronary resistance and decreased coronary flow after cocaine as described in the literature, it is suggested that microvascular spasm of smaller vessels plays a major role in the temporary decrease in perfusion. The data may also suggest that severe temporary myocardial ischemia is probably the initiating factor for the cardiac complications induced by cocaine. C1 SUNY STONY BROOK,SCH MED,STONY BROOK,NY 11794. RP OSTER, ZH (reprint author), BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973, USA. NR 20 TC 12 Z9 12 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 22090-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD AUG PY 1991 VL 32 IS 8 BP 1569 EP 1572 PG 4 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA GB157 UT WOS:A1991GB15700023 PM 1869981 ER PT J AU GUSTAFSON, J ROVER, D ELBERT, S CARTER, M AF GUSTAFSON, J ROVER, D ELBERT, S CARTER, M TI THE DESIGN OF A SCALABLE, FIXED-TIME COMPUTER BENCHMARK SO JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING LA English DT Article RP GUSTAFSON, J (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. RI Elbert, Stephen/F-9019-2016 OI Elbert, Stephen/0000-0003-2258-8901 NR 17 TC 15 Z9 15 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0743-7315 J9 J PARALLEL DISTR COM JI J. Parallel Distrib. Comput. PD AUG PY 1991 VL 12 IS 4 BP 388 EP 401 DI 10.1016/0743-7315(91)90008-W PG 14 WC Computer Science, Theory & Methods SC Computer Science GA GA408 UT WOS:A1991GA40800008 ER PT J AU WARREN, BF CLAPP, NK AF WARREN, BF CLAPP, NK TI THE SPECTRUM OF LIVER-DISEASE IN COTTON TOP TAMARIN COLITIS SO JOURNAL OF PATHOLOGY LA English DT Meeting Abstract C1 UNIV BRISTOL,SCH MED SCI,DEPT PATHOL,BRISTOL BS8 1TH,AVON,ENGLAND. OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN 37830. NR 0 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 0022-3417 J9 J PATHOL JI J. Pathol. PD AUG PY 1991 VL 164 IS 4 BP A362 EP A362 PG 1 WC Oncology; Pathology SC Oncology; Pathology GA GD275 UT WOS:A1991GD27500174 ER PT J AU DUDA, JR SALAMY, SP AMINIAN, K AMERI, S AF DUDA, JR SALAMY, SP AMINIAN, K AMERI, S TI PRESSURE ANALYSIS OF AN UNSTIMULATED HORIZONTAL WELL WITH TYPE CURVES SO JOURNAL OF PETROLEUM TECHNOLOGY LA English DT Article AB Horizontal wells are effective alternatives to fractured vertical wells in several reservoir types, including low-permeability sandstones and shales. An understanding of fluid flow relationships is a prerequisite for efficient use of horizontal technology. The pressure-buildup data analyzed here were recorded in a horizontal completion in a low-permeability gas-bearing shale. The well was drilled and tested to verify laboratory and computer modeling research. After the general solutions were developed, the data were analyzed to describe reservoir properties and the effectiveness of the completion. Results of the type-curve analysis indicate that the contributing well length was shorter than the actual drilled length and that the contributing reservoir thickness was less than the typical net pay. Numerical modeling was used to verify the calculated parameters. Results fully support the well length and reservoir thickness determined through type-curve analysis, indicating that an unstimulated horizontal well completed in a heterogeneous formation may be insufficient to link the full vertical extent of the reservoir to the wellbore. C1 BDM ENGN SERV CO,MORGANTOWN,WV. W VIRGINIA UNIV,DEPT PETR & NAT GAS ENGN,MORGANTOWN,WV 26506. RP DUDA, JR (reprint author), US DOE,MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV, USA. NR 49 TC 0 Z9 0 U1 0 U2 0 PU SOC PETROLEUM ENG PI RICHARDSON PA 222 PALISADES CREEK DR, RICHARDSON, TX 75080 SN 0149-2136 J9 J PETROL TECHNOL JI J. Pet. Technol. PD AUG PY 1991 VL 43 IS 8 BP 988 EP 993 PG 6 WC Energy & Fuels; Engineering, Chemical; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA GA029 UT WOS:A1991GA02900011 ER PT J AU MAHIOU, B CLAPP, GE GLEICHER, GJ FREEMAN, PK CAMAIONI, DM AF MAHIOU, B CLAPP, GE GLEICHER, GJ FREEMAN, PK CAMAIONI, DM TI THEORETICAL-MODELS FOR THE REDUCTION OF ARYLMETHYL HALIDES BY TRIORGANOTIN HYDRIDES SO JOURNAL OF PHYSICAL ORGANIC CHEMISTRY LA English DT Article ID ATOM ABSTRACTION; RADICALS AB Two mechanistic pathways have been proposed for halogen atom transfer from the benzylic positions of halomethylarenes to triorganotin radicals. These are direct atom abstraction, which might involve an extremely polar transition state, and single electron transfer followed by bond cleavage. AM1 semi-empirical calculations have been utilized to model the rate-determining step of these processes. A wide range of related families of compounds have been studied, including substituted halomethylbenzenes, selected halomethyl-substituted polycyclic aromatic hydrocarbons and oxygen- and nitrogen-containing chloromethyl-substituted heteroaromatic systems. Although these calculations are relatively simple, the present results corroborate the view that chlorine and bromine atom transfer from the benzylic position to triorganotin radicals involves a direct atom abstraction in the rate-determining step whereas reduction of the corresponding iodides proceeds via an electron-transfer mechanism. C1 BATTELLE NW RES LABS,RICHLAND,WA 99352. OREGON STATE UNIV,DEPT CHEM,CORVALLIS,OR 97331. RP MAHIOU, B (reprint author), OREGON STATE UNIV,DEPT AGR CHEM,CORVALLIS,OR 97331, USA. NR 24 TC 1 Z9 1 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0894-3230 J9 J PHYS ORG CHEM JI J. Phys. Org. Chem. PD AUG PY 1991 VL 4 IS 8 BP 485 EP 491 DI 10.1002/poc.610040804 PG 7 WC Chemistry, Organic; Chemistry, Physical SC Chemistry GA GC986 UT WOS:A1991GC98600003 ER PT J AU LEE, CC YANG, SN LEE, TSH AF LEE, CC YANG, SN LEE, TSH TI MESON EXCHANGE PI-N MODEL AND NEUTRAL PION-PHOTOPRODUCTION FROM PROTONS NEAR THRESHOLD SO JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS LA English DT Letter ID NUCLEON; DEUTERON AB Starting from a three-dimensional reduction of the Bethe-Salpeter equation, a meson exchange pi-N model is constructed. The resulting pi-N potential includes the direct and exchange nucleon terms, sigma and rho exchanges terms, and direct and exchange DELTA terms. Reasonable fits to the pi-N low-energy phaseshifts are obtained. The constructed meson exchange potential is then used to evaluate rescattering effects in the dipole amplitude E0 + of pi-0 photoproduction from protons near threshold. The results are close to the most recent Mainz data. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP LEE, CC (reprint author), NATL TAIWAN UNIV,DEPT PHYS,TAIPEI 10764,TAIWAN. NR 21 TC 41 Z9 41 U1 0 U2 1 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 AUG PY 1991 VL 17 IS 8 BP L131 EP L137 DI 10.1088/0954-3899/17/8/003 PG 7 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA FZ732 UT WOS:A1991FZ73200003 ER PT J AU VARMANAIR, M PAN, R WUNDERLICH, B AF VARMANAIR, M PAN, R WUNDERLICH, B TI HEAT-CAPACITIES AND ENTROPIES OF LINEAR, ALIPHATIC POLYESTERS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article ID RIGID-AMORPHOUS CONTENT; HIGH MELTING POLYMERS; THERMODYNAMIC PROPERTIES; POLY(BUTYLENE TEREPHTHALATE); TRANSITION BEHAVIOR; PHENYLENE GROUPS; THERMAL-ANALYSIS; MACROMOLECULES; POLYETHYLENE; LIQUID AB New measurements of the heat capacity in the melt of poly(trimethylene succinate) (PTMS), poly(trimethylene adipate) (PTMA), and poly(hexamethylene sebacate) (PHMS) from 310 to 400 K are presented. Based on these data and literature data on eight other molten polylactones and poly(ethylene sebacate) (PES), an addition scheme is developed for linear, aliphatic polyesters that leads to the equation: C(p)(linear aliphatic polyesters) = N(CH2) (13.7711 + 0.04871 T) + N(COO) (57.7678 + 0.04810 T) which represents the ATHAS-recommended melt heat capacities for all linear polyesters. Combining previously discussed solid heat capacities, derived from an approximate frequency spectrum, with the new liquid heat capacities, the various thermodynamic functions (enthalpy, entropy, and Gibbs function) could be derived using the ATHAS computation scheme. The average value of residual entropy at zero kelvin of 5.3 +/- 1.8 J/(K mol) per mobile bead for glassy linear polyesters was found to be somewhat higher than for many other polymers in the data bank, but closer to that observed for linear, aliphatic polyamides. The phase transitions of PTMS, PTMA, and PHMS are also analyzed using the quantitative baselines available from the heat capacity study. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. RP VARMANAIR, M (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 32 TC 14 Z9 14 U1 1 U2 14 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 AUG PY 1991 VL 29 IS 9 BP 1107 EP 1115 DI 10.1002/polb.1991.090290909 PG 9 WC Polymer Science SC Polymer Science GA FX286 UT WOS:A1991FX28600009 ER PT J AU RUGGLES, MB KREMPL, E AF RUGGLES, MB KREMPL, E TI RATE SENSITIVITY AND SHORT-TERM RELAXATION BEHAVIOR OF AISI TYPE-304 STAINLESS-STEEL AT ROOM-TEMPERATURE AND AT 650-DEGREES-C - INFLUENCE OF PRIOR AGING SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID STRAIN; DEPENDENCE; ALLOYS; CREEP AB The strain rate sensitivity and short-term relaxation behavior of Type 304 stainless steel were investigated in the uniaxial strain rate jump tests with intermittent periods of relaxation at room temperature and at 650-degrees-C. At room temperature material exhibited conventional strain rate sensitivity and no strain rate history effect. The high-temperature experimental results revealed a complex and dramatically different material behavior. At 650-degrees-C the pattern of strain rate sensitivity was not set as soon as the plastic flow was fully established, but continued to evolve with the further straining in the plastic range. Test results indicate that at 650-degrees-C the material may exhibit a strain rate history effect. Both at room temperature and at 650-degrees-C the relaxation behavior was independent of the stress and/or strain level at the beginning of the relaxation, but depended nonlinearly on the strain rate preceding the relaxation test. Prior aging had no significant influence on the rate-dependent material response. The irregular material behavior at 650-degrees-C is attributed to dynamic strain aging as indicated by serrated stress-strain curves (the Portevin-LeChatelier effect). C1 RENSSELAER POLYTECH INST,MECH MAT LAB,TROY,NY 12180. OAK RIDGE NATL LAB,DIV ENGN TECHNOL,OAK RIDGE,TN 37831. RI Ruggles-Wrenn, Marina/J-6103-2014 NR 20 TC 5 Z9 5 U1 0 U2 3 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1991 VL 113 IS 3 BP 385 EP 391 DI 10.1115/1.2928771 PG 7 WC Engineering, Mechanical SC Engineering GA HP755 UT WOS:A1991HP75500006 ER PT J AU URAS, RA LIU, WK AF URAS, RA LIU, WK TI BUCKLING OF FORCE-EXCITED LIQUID-FILLED SHELLS SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID TANK AB The matrix equation of motion for liquid-filled shells with a particular reference to the influence of ground excitation are derived through a Galerkin/finite element discretization procedure. The modal coupling among the various combinations of axial and circumferential modes are identified. The equations for the dynamic buckling analysis of liquid-filled shells are presented. The buckling criteria of liquid-filled shells subjected to horizontal ground excitation are established. A comparison to available experimental results gives strikingly good agreement. The importance of modal interaction in the axial as well as circumferential directions is also demonstrated. This provides guidelines for a better understanding of dynamic buckling of liquid-filled shells. C1 ARGONNE NATL LAB,DIV REACTOR ENGN,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT MECH ENGN,EVANSTON,IL 60208. RI Liu, Wing/B-7599-2009 NR 11 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1991 VL 113 IS 3 BP 418 EP 422 DI 10.1115/1.2928776 PG 5 WC Engineering, Mechanical SC Engineering GA HP755 UT WOS:A1991HP75500011 ER PT J AU SNYDER, SC REYNOLDS, LD SHAW, CB KEARNEY, RJ AF SNYDER, SC REYNOLDS, LD SHAW, CB KEARNEY, RJ TI GAS TEMPERATURES IN AN ATMOSPHERIC THERMAL PLASMA-JET AT LARGE RADII FROM RAYLEIGH LINESHAPE MEASUREMENTS SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article ID NON-LTE; SCATTERING AB Gas temperatures were determined at four radial positions in the fringe of an atmospheric pressure argon plasma jet. The gas temperature was calculated from lineshapes obtained by analyzing the Rayleigh-Brillouin scattered laser light with a scanning tandem Fabry-Perot interferometer. Gas temperatures determined with this technique are markedly different from those determined by using emission spectroscopy and show departure from LTE conditions in the plasma-jet fringe. C1 UNIV IDAHO,DEPT PHYS,MOSCOW,ID 83843. RP SNYDER, SC (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 13 TC 6 Z9 6 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD AUG PY 1991 VL 46 IS 2 BP 119 EP 124 DI 10.1016/0022-4073(91)90087-7 PG 6 WC Optics; Spectroscopy SC Optics; Spectroscopy GA FP824 UT WOS:A1991FP82400006 ER PT J AU MENDOZA, PG JACKSON, DD NIEMCZYK, TM AF MENDOZA, PG JACKSON, DD NIEMCZYK, TM TI PRECISION OF A PLUTONIUM ANALYTICAL METHOD USING SOLVENT-EXTRACTION AND SPECTROPHOTOMETRY SO JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY-ARTICLES LA English DT Article AB We investigated the plutonium assay method that uses the plutonyl trinitrate tetrapropyl-ammonium ion-pair solvent extraction with spectrophotometry of the extract as a candidate method capable of providing robustness and precision. To identify and assess the effect of factors on the precision, we looked at sampling techniques, silver oxide oxidation conditions extraction time, extract stability, and temperature dependence of the extract analytical peak height and position. We obtained a precision of 0.12%. C1 UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. RP MENDOZA, PG (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU AKADEMIAI KIADO PI BUDAPEST PA PO BOX 245, H-1519 BUDAPEST, HUNGARY SN 0236-5731 J9 J RADIOAN NUCL CH AR JI J. Radioanal. Nucl. Chem.-Artic. PD AUG PY 1991 VL 150 IS 2 BP 435 EP 444 DI 10.1007/BF02035330 PG 10 WC Chemistry, Analytical; Chemistry, Inorganic & Nuclear; Nuclear Science & Technology SC Chemistry; Nuclear Science & Technology GA FW187 UT WOS:A1991FW18700024 ER PT J AU KRAYNIK, AM REINELT, DA PRINCEN, HM AF KRAYNIK, AM REINELT, DA PRINCEN, HM TI THE NONLINEAR ELASTIC BEHAVIOR OF POLYDISPERSE HEXAGONAL FOAMS AND CONCENTRATED EMULSIONS SO JOURNAL OF RHEOLOGY LA English DT Article ID RHEOLOGY; FRACTION; FROTH; DEFORMATIONS; MODEL AB A complete constitutive theory that describes the nonlinear elastic behavior of foams and concentrated emulsions with two-dimensional, polydisperse hexagonal structure is derived. The individual bubbles are irregular hexagons that can vary widely in size and shape. The straight thin films and threefold symmetric Plateau borders exhibited by perfectly ordered monodisperse systems are retained by polydisperse hexagonal structures. The constitutive theory is expressed as explicit relations between the Cauchy stress and the Cauchy-Green strain tensors, or in terms of a strain energy function. The important material characteristics are surface tension, number density of bubbles, and, if the dispersed phase is gas, an equation of state. The specific spatial arrangement and size distribution of the bubbles does not affect the elastic response. The volume fraction of the phases only influences the stress through the dispersed phase pressure. Weaire, Kermode, and Fu have conjectured that the elastic response associated with monodisperse structure provides an upper bound for all two-dimensional fluid-fluid networks; we extend this conjecture to polydisperse hexagonal structure, not just monodisperse structure. C1 SO METHODIST UNIV,DEPT MATH,DALLAS,TX 75275. MOBIL RES & DEV CORP,PRINCETON,NJ 08543. RP KRAYNIK, AM (reprint author), SANDIA NATL LABS,DEPT FLUID THERMAL & STRUCT SCI,DIV 1511,ALBUQUERQUE,NM 87185, USA. NR 16 TC 32 Z9 34 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0148-6055 J9 J RHEOL JI J. Rheol. PD AUG PY 1991 VL 35 IS 6 BP 1235 EP 1253 DI 10.1122/1.550173 PG 19 WC Mechanics SC Mechanics GA GA082 UT WOS:A1991GA08200013 ER PT J AU MANCINI, TR AF MANCINI, TR TI ANALYSIS AND DESIGN OF 2 STRETCHED-MEMBRANE PARABOLIC DISH CONCENTRATORS SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB The state-of-the-art of parabolic dish solar concentrators is the faceted, glass-metal dish. The mass production costs of glass-metal dishes may be high because they do not incorporate the innovations of design and materials developed over the last eight years. Therefore, Sandia National Laboratories has undertaken to develop two stretched-membrane parabolic dish concentrators for the Department of Energy's Solar Thermal Program. These solar concentrators are being designed for integration with an advanced solar receiver and a Stirling engine/generator in a 25-kW(e) power production unit. The first dish, which builds on the successful design of the stretched-membrane heliostats, is to be a low risk, near-term commercial solar concentrator. This solar concentrator comprises 12 large, 3.6-m diameter, stretched-membrane facets that are formed into parabolic shapes either with a large vacuum or by performing the thin membranes plastically. The focal length-to-diameter ratios (f/Ds) for the facets are about 3.0, relatively large for a dish but much lower than heliostats where they typically range from 50 to 100. Two contractors are currently fabricating facets for this dish, and a third contractor is designing the facet support structure and pedestal for the dish. The second stretched-membrane concentrator is a single-element monolithic dish with an f/D of 0.6. The dish is shaped into a parabola by plastically yielding the membrane using a combination of uniform and nonuniform loading. Initial measurements of the dish indicate that it has a slope error of 2.6 milliradians (one standard deviation) relative to a perfect parabola. In this paper, the designs of the two stretched-membrane dishes are analyzed using the computer code CIRCE to model the optical performance of the concentrators and a thermal model, which includes conduction, convection, and radiation heat transfer, to calculate the thermal losses from the cavity solar receivers. The solar collector efficiency, defined as the product of the optical efficiency of the collector and the thermal efficiency of the receiver, is optimized for comparing the performance of several solar concentrator configurations. Ten facet arrangements for the faceted stretched-membrane dish and the single-element stretched-membrane dish are modeled and their performances compared with that of a state-of-the-art glass-metal dish. Last, the initial designs of these two stretched-membrane dishes are described along with the results of preliminary performance measurements on their respective optical elements. C1 SANDIA NATL LABS,DIV 6216,ALBUQUERQUE,NM 87185. NR 20 TC 5 Z9 6 U1 1 U2 5 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD AUG PY 1991 VL 113 IS 3 BP 180 EP 187 DI 10.1115/1.2930490 PG 8 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA HP746 UT WOS:A1991HP74600007 ER PT J AU GOSWAMI, DY HINGORANI, S MINES, G AF GOSWAMI, DY HINGORANI, S MINES, G TI A LASER-BASED TECHNIQUE FOR PARTICLE SIZING TO STUDY 2-PHASE EXPANSION IN TURBINES SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB Efficiency of binary power cycles can be improved by expanding the hydrocarbon working fluids through two-phase region in a turbine and exiting at saturated or superheated condition. This improvement can be achieved if there is no condensation during the expansion or if there is condensation, the droplet size is extremely small. In order to verify this, a particle sizing technique for extremely small particles in flow is needed. In this study, a laser-based technique is developed by which it is possible to detect particles as small at ten angstroms in size. The basis of the technique is that particles of size less than one third of the wavelength of the incident radiation will scatter according to Rayleigh scattering theory. According to this theory, the intensity of the scattered light will be the same in the forward as well as in the backward directions. Therefore, measurement of the scattered intensity at two or three different angles will confirm the presence of Rayleigh scattering. The size of the particles can, then, be calculated from the measured scattered intensity according to the Rayleigh scattering equation. C1 UNIV FLORIDA,DEPT MECH ENGN,SOLAR ENERGY & ENERGY CONVERS RES LABS,GAINESVILLE,FL 32611. AUBURN UNIV,DEPT MECH ENGN,AUBURN,AL 36849. EG&G IDAHO INC,IDAHO FALLS,ID 83401. NR 13 TC 4 Z9 4 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD AUG PY 1991 VL 113 IS 3 BP 211 EP 218 DI 10.1115/1.2930495 PG 8 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA HP746 UT WOS:A1991HP74600012 ER PT J AU HAINFELD, JF SPRINZL, M MANDIYAN, V TUMMINIA, SJ BOUBLIK, M AF HAINFELD, JF SPRINZL, M MANDIYAN, V TUMMINIA, SJ BOUBLIK, M TI LOCALIZATION OF A SPECIFIC NUCLEOTIDE IN YEAST TRANSFER-RNA BY SCANNING-TRANSMISSION ELECTRON-MICROSCOPY USING AN UNDECAGOLD CLUSTER SO JOURNAL OF STRUCTURAL BIOLOGY LA English DT Article ID PHENYLALANINE TRANSFER-RNA; SITE C1 ROCHE INST MOLEC BIOL,ROCHE RES CTR,NUTLEY,NJ 07110. BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. UNIV BAYREUTH,BIOCHEM LAB,W-8580 BAYREUTH,GERMANY. NR 16 TC 17 Z9 17 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 1047-8477 J9 J STRUCT BIOL JI J. Struct. Biol. PD AUG PY 1991 VL 107 IS 1 BP 1 EP 5 DI 10.1016/1047-8477(91)90024-Q PG 5 WC Biochemistry & Molecular Biology; Biophysics; Cell Biology SC Biochemistry & Molecular Biology; Biophysics; Cell Biology GA GC975 UT WOS:A1991GC97500001 PM 1817605 ER PT J AU JACOBS, KR MILLER, TA GOLDMAN, AI FINNEMORE, DK GLEIXNER, RA RIGHI, J ZEIGLER, D AF JACOBS, KR MILLER, TA GOLDMAN, AI FINNEMORE, DK GLEIXNER, RA RIGHI, J ZEIGLER, D TI ENVIRONMENTAL CONTAMINATION OF AMORPHOUS BI-SR-CA-CU-O FIBERS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE SUPERCONDUCTIVITY; ENVIRONMENTAL CONTAMINATION; AMORPHOUS; BI2SR2CA1CU2O8-DELTA AB A study of the environmental contamination of amorphous Bi2Sr2Ca1Cu2O8-delta fibers has been undertaken in order to determine the best method to handle these materials during the fabrication of superconducting wire. The fibers often need to be handled in organic solvents as part of the cleaning and manipulating process. In organics that are free of water, the fibers retain their mechanical strength with little carbon contamination or other ill effects. Water, however, causes premature crystallization and destroys the mechanical strength of the fibers. RP JACOBS, KR (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT PHYS & ASTRON,AMES,IA 50011, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD AUG PY 1991 VL 4 IS 4 BP 311 EP 313 DI 10.1007/BF00618153 PG 3 WC Physics, Applied; Physics, Condensed Matter SC Physics GA GJ541 UT WOS:A1991GJ54100009 ER PT J AU LIN, HT BECHER, PF AF LIN, HT BECHER, PF TI HIGH-TEMPERATURE CREEP DEFORMATION OF ALUMINA SIC-WHISKER COMPOSITES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article; Proceedings Paper CT SYMP AT THE 92ND ANNUAL MEETING OF THE AMERICAN CERAMIC SOC : CERAMIC MATRIX COMPOSITES CY APR 26, 1990 CL DALLAS, TX SP AMER CERAM SOC DE CREEP; ALUMINA; SILICON CARBIDE; WHISKERS; HIGH TEMPERATURE ID SILICONIZED SILICON-CARBIDE; DAMAGE-ENHANCED CREEP; REINFORCED ALUMINA; TOUGHENING BEHAVIOR; AL2O3; DEPENDENCE; FRACTURE; AIR; MGO AB The creep resistance at temperatures between 1200-degrees and 1300-degrees-C in air of alumina-SiC-whisker composites was investigated via four-point flexure to examine (1) the effect of whisker content and (2) the influence of densification additives (i.e., Y2O3 (plus MgO)). The creep resistance of polycrystalline alumina is greatly improved with the addition of less-than-or-equal-to 20 vol% SiC whiskers. The interlocking/pinning of grains by whiskers which limits grain-boundary sliding contributes to the improvement in creep resistance. However, the creep rates of alumina composites in air increase at whisker contents greater-than-or-equal-to 30 vol%. Electron microscopy observations suggested that the degradation in creep resistance for whisker content greater-than-or-equal-to 30 vol% originated from (1) the promotion of creep cavitation and subsequent microcrack generation from the higher number density of nucleation sites and (2) more extensive formation of grain-boundary amorphous phase(s) associated with an observed increased oxidation rate. Along this one, the excellent creep resistance of alumina composites containing 20 vol% SiC whiskers was significantly degraded by the presence of the intergranular amorphous phases introduced by the addition of the Y2O3 densification additive. RP LIN, HT (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 38 TC 44 Z9 46 U1 1 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 AUG PY 1991 VL 74 IS 8 BP 1886 EP 1893 DI 10.1111/j.1151-2916.1991.tb07804.x PG 8 WC Materials Science, Ceramics SC Materials Science GA GC006 UT WOS:A1991GC00600017 ER PT J AU KIM, KYK JANG, KY UPADHYE, RS AF KIM, KYK JANG, KY UPADHYE, RS TI HOLLOW SILICA SPHERES OF CONTROLLED SIZE AND POROSITY BY SOL-GEL PROCESSING SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE SPHERES; SILICA; SOL-GEL; NUCLEAR MATERIALS; AEROGEL ID LASER-FUSION TARGETS; AEROGEL SPHERES; FABRICATION AB A new technique particularly suitable for fabricating uniform, hollow silica spheres of controlled size and porosity is described. The technique, which combines sol-gel processing with a hollow-drop generation technique, consists of producing a continuous stream of uniform, hollow drops of a tetraethyl orthosilicate solution and then converting the drops into a rigid form by exposing them to an ammoniated vapor gelation medium. The parameters controlling the properties of the resulting silica spheres are the detailed chemical makeup of the reactant solution and the gelation medium, and the dimensions and relative positions of the nozzles used for drop generation. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP KIM, KYK (reprint author), UNIV ILLINOIS,FUS TECHNOL & CHARGED PARTICLE RES LAB,URBANA,IL 61801, USA. NR 19 TC 45 Z9 46 U1 0 U2 14 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 AUG PY 1991 VL 74 IS 8 BP 1987 EP 1992 DI 10.1111/j.1151-2916.1991.tb07819.x PG 6 WC Materials Science, Ceramics SC Materials Science GA GC006 UT WOS:A1991GC00600032 ER PT J AU MICHALSKE, TA SMITH, WL BUNKER, BC AF MICHALSKE, TA SMITH, WL BUNKER, BC TI FATIGUE MECHANISMS IN HIGH-STRENGTH SILICA-GLASS FIBERS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note DE FIBERS; GLASS; FATIGUE; MECHANISMS; MODELS ID OPTICAL FIBERS; STATIC FATIGUE AB We use experimentally determined crack growth data for silica glass and a fracture mechanics model for delayed failure to predict the fatigue behavior for high-strength silica-glass fibers. The results of this model indicate that fracture mechanics methods can be used to adequately describe the fatigue behavior observed for high-strength silica-glass fibers at room temperature in humid conditions. The key feature to properly interpreting the fatigue of high-strength fibers is the use of a fracture-rate law in which the crack extension rate increases exponentially with applied stress. We show that a fracture mechanics approach to high-strength fiber fatigue can provide the basis for identifying additional fatigue mechanisms that may control failure in more aggressive fatigue environments. RP MICHALSKE, TA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 21 TC 34 Z9 34 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 AUG PY 1991 VL 74 IS 8 BP 1993 EP 1996 DI 10.1111/j.1151-2916.1991.tb07820.x PG 4 WC Materials Science, Ceramics SC Materials Science GA GC006 UT WOS:A1991GC00600033 ER PT J AU SHAPIRO, MJ MORE, KL LACKEY, WJ HANIGOFSKY, JA HILL, DN CARTER, WB BAREFIELD, EK JUDSON, EA OBRIEN, DF PATRICK, R CHUNG, YS MOSS, TS AF SHAPIRO, MJ MORE, KL LACKEY, WJ HANIGOFSKY, JA HILL, DN CARTER, WB BAREFIELD, EK JUDSON, EA OBRIEN, DF PATRICK, R CHUNG, YS MOSS, TS TI INTERACTION OF CHEMICALLY VAPOR-DEPOSITED YBA2CU3OX WITH YTTRIA-STABILIZED ZIRCONIA SUBSTRATES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note DE SUPERCONDUCTORS; TRANSMISSION ELECTRON MICROSCOPY; FILMS; ZIRCONIA; CHEMICAL VAPOR DEPOSITION ID SUPERCONDUCTING THIN-FILMS; SRTIO3; PHASE AB High-resolution transmission electron microscopy and optical diffractograms have revealed that chemically vapor deposited films of superconducting YBa2Cu3O(x) react to form an interaction layer with single-crystal yttria-stabilized zirconia. The approximately 5 nm thick interlayer was identified as BaZrO3. Zirconium was also found to diffuse through the entire YBa2Cu3O(x) film. C1 GEORGIA TECH RES INST,ATLANTA,GA 30332. GEORGIA INST TECHNOL,ATLANTA,GA 30332. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI More, Karren/A-8097-2016 OI More, Karren/0000-0001-5223-9097 NR 29 TC 9 Z9 9 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 AUG PY 1991 VL 74 IS 8 BP 2021 EP 2024 DI 10.1111/j.1151-2916.1991.tb07828.x PG 4 WC Materials Science, Ceramics SC Materials Science GA GC006 UT WOS:A1991GC00600041 ER PT J AU YEUNG, ES AF YEUNG, ES TI NEW APPROACHES TO ABSORPTION DETECTION IN CAPILLARY CHROMATOGRAPHY AND CAPILLARY ELECTROPHORESIS SO JOURNAL OF THE CHINESE CHEMICAL SOCIETY LA English DT Article ID LIQUID-CHROMATOGRAPHY; ZONE ELECTROPHORESIS; FLUORESCENCE AB Two new approaches for absorption detection in capillary columns are presented. They are applicable to columns as narrow as 10-mu-m i.d. Both provide good sensitivity despite the very short optical pathlengths that are commonly available in commercial systems. The first involves irradiating the column along its axis rather than across the axis. The entire analyte zone can then participate in absorption. Gains up to 1000 fold can be expected. The second is a modification of laser-excited fluorescence. The absorbing analytes, even though they do not fluoresce efficiently, can transfer their energy to a fluorophore added to the mobile phase. The secondary emission can be used to detect absorption in the nanomolar range. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES,IA 50011. RP YEUNG, ES (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 19 TC 6 Z9 6 U1 0 U2 0 PU CHINESE CHEM SOC PI TAIPEI PA PO BOX 609, TAIPEI 10099, TAIWAN SN 0009-4536 J9 J CHIN CHEM SOC-TAIP JI J. Chin. Chem. Soc. PD AUG PY 1991 VL 38 IS 4 BP 307 EP 312 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA GB577 UT WOS:A1991GB57700002 ER PT J AU SCULLY, JR CIESLAK, WR BOVARD, FS AF SCULLY, JR CIESLAK, WR BOVARD, FS TI ENVIRONMENTALLY ASSISTED CRACKING OF CATHODICALLY POLARIZED NICKEL IN LIALCL4/SOCL2 ELECTROLYTE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID SOCL2 REDUCTION; LI-SOCL2 CELLS; EMBRITTLEMENT; SURFACE; MECHANISMS; DIFFUSION AB The susceptibility of nickel to environmentally assisted cracking was investigated at potentials that are relevant to primary Li/SOCl2 batteries which utilize a 1.5M LiAlCl4/SOCl2 electrolyte. Slow strain rate tests were performed on Ni under conditions which simulate exposure of Ni grid supporting the Li anode, Ni grid supporting the cathode, and exposure to the vapor phase above a LiAlCl4/SOCl2 electrolyte. A mixture of transgranular and intergranular cracking is observed only when polycrystalline Ni is galvanically coupled to Li or polarized to potentials equal to or below 0.0 V vs. a Li/LiCl reference electrode. Under both of these circumstances, zero valent Li is produced from the cathodic reduction of a LiCl film which forms on exposed Ni surfaces. A Li-induced embrittlement mechanism is proposed whereby (i) LiCl is precipitated from solution at fresh crack tips, (ii) solid Li metal is formed from cathodic reduction of LiCl, (iii) Li promotes initiation of cracks at the Ni surface, and (iv) crack advance occurs at sufficiently high rates to preclude Li diffusion into the Ni ahead of the crack tip, implying a surface-induced cracking process. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP SCULLY, JR (reprint author), UNIV VIRGINIA,CTR ELECTROCHEM SCI & ENGN,CHARLOTTESVILLE,VA 22903, USA. NR 41 TC 3 Z9 3 U1 0 U2 1 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 AUG PY 1991 VL 138 IS 8 BP 2229 EP 2237 DI 10.1149/1.2085955 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FZ323 UT WOS:A1991FZ32300013 ER PT J AU ARMSTRONG, MJ MULLER, RH AF ARMSTRONG, MJ MULLER, RH TI INSITU SCANNING TUNNELING MICROSCOPY OF COPPER DEPOSITION WITH BENZOTRIAZOLE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB The submicron topography of Cu deposits has been studied with scanning tunneling microscopy to investigate the effect of benzotriazole in the initial stages of deposition. The presence of benzotriazole results in a marked increase in over-potential for the deposition. It is found to eliminate the preferential growth of specific crystallographic planes and the formation of crystal facets. The number density of nuclei, determined from Fourier transforms of the surface profiles of 7 nm thick films, is found to increase with increasing overpotential of the deposition but is independent of the presence of the inhibitor. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. NR 11 TC 59 Z9 60 U1 1 U2 2 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD AUG PY 1991 VL 138 IS 8 BP 2303 EP 2307 DI 10.1149/1.2085965 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FZ323 UT WOS:A1991FZ32300023 ER PT J AU SPRINGER, TE ZAWODZINSKI, TA GOTTESFELD, S AF SPRINGER, TE ZAWODZINSKI, TA GOTTESFELD, S TI POLYMER ELECTROLYTE FUEL-CELL MODEL SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID DIFFUSION AB We present here an isothermal, one-dimensional, steady-state model for a complete polymer electrolyte fuel cell (PEFC) with a 117 Nafion(R) membrane. In this model we employ water diffusion coefficients electro-osmotic drag coefficients, water sorption isotherms, and membrane conductivities, all measured in our laboratory as functions of membrane water content. The model predicts a net-water-per-proton flux ratio of 0.2 H2O/H+ under typical operating conditions, which is much less than the measured electro-osmotic drag coefficient for a fully hydrated membrane. It also predicts an increase in membrane resistance with increased current density and demonstrates the great advantage of a thinner membrane in alleviating this resistance problem. Both of these predictions were verified experimentally under certain conditions. RP SPRINGER, TE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 17 TC 1872 Z9 1933 U1 32 U2 374 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 AUG PY 1991 VL 138 IS 8 BP 2334 EP 2342 DI 10.1149/1.2085971 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FZ323 UT WOS:A1991FZ32300029 ER PT J AU GUILINGER, TR KELLY, MJ KNAPP, JA WALSH, DS DOYLE, BL AF GUILINGER, TR KELLY, MJ KNAPP, JA WALSH, DS DOYLE, BL TI ION-BEAM MEASUREMENT OF DEUTERIUM IN PALLADIUM AND CALCULATION OF HYDROGEN ISOTOPE-SEPARATION FACTORS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter AB We demonstrate a new technique for measuring hydrogen isotope separation factors in hydrogen-absorbing metals. Using external ion beam nuclear reaction analysis of metal electrodes in an operating electrochemical cell, we monitor in situ the deuterium content of the electrode. Changing the deuterium/hydrogen ratio in the electrolyte changes the observed deuterium content of the metal electrode, and, assuming identical ultimate total metal loading for deuterium, hydrogen, and any mixture of deuterium and hydrogen, a simple calculation yields the separation factor. RP GUILINGER, TR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 7 TC 1 Z9 1 U1 0 U2 2 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD AUG PY 1991 VL 138 IS 8 BP L26 EP L27 DI 10.1149/1.2086001 PG 2 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FZ323 UT WOS:A1991FZ32300003 ER PT J AU BISSON, SE WORDEN, EF CONWAY, JG COMASKEY, B STOCKDALE, JAD NEHRING, F AF BISSON, SE WORDEN, EF CONWAY, JG COMASKEY, B STOCKDALE, JAD NEHRING, F TI DETERMINATION OF ABSOLUTE TRANSITION-PROBABILITIES IN NEUTRAL CERIUM FROM BRANCHING RATIO AND LIFETIME MEASUREMENTS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article AB We have used the 1-m Fourier-transform spectrometer at the National Solar Observatory, Kitt Peak, Arizona, to record the emission spectrum of Ce-140 from an electrodeless discharge lamp in the 4000-27 600-cm-1 range. Branching ratios are determined from the intensity data for transitions originating from common upper levels. These measurements are combined with lifetimes determined by a delayed photoionization technique to yield transition probabilities or gA values for 30 transitions. A plot of the logarithm of intensity divided by gA versus upper energy was constructed; the excitation temperature of the source was determined from this plot. Also from this plot, absolute gA values were derived for 228 of the most intense observed lines of Ce I between 10 706 and 22 184 cm-1. To our knowledge, the gA values obtained here are the first reported for neutral cerium. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP BISSON, SE (reprint author), UNIV CALIF DAVIS,DEPT APPL SCI,POB 808,LIVERMORE,CA 94550, USA. NR 17 TC 21 Z9 21 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 AUG PY 1991 VL 8 IS 8 BP 1545 EP 1558 DI 10.1364/JOSAB.8.001545 PG 14 WC Optics SC Optics GA GA281 UT WOS:A1991GA28100001 ER PT J AU TARRIO, C HUSK, DE SCHNATTERLY, SE AF TARRIO, C HUSK, DE SCHNATTERLY, SE TI OPTICAL-ABSORPTION MEASUREMENTS IN THE SOFT-X-RAY RANGE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID INELASTIC ELECTRON-SCATTERING AB We report measurements of optical-absorption coefficients obtained by techniques not requiring free-standing films. The results of these methods are compared with data obtained by inelastic electron scattering. We find that, as expected, absorption data obtained with smoother substrates yield results with more detail in the regions with rich structure. The spectra resulting from samples evaporated onto a Si diode vacuum-UV detector with a KCl buffer layer yield results that are quite similar to the results for inelastic electron scattering. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RP TARRIO, C (reprint author), UNIV VIRGINIA,JESSE BEAMS LAB PHYS,CHARLOTTESVILLE,VA 22901, USA. NR 13 TC 5 Z9 5 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD AUG PY 1991 VL 8 IS 8 BP 1588 EP 1591 DI 10.1364/JOSAB.8.001588 PG 4 WC Optics SC Optics GA GA281 UT WOS:A1991GA28100006 ER PT J AU CORVO, A AF CORVO, A TI DENSITY BEHAVIOR AND WAVE-FRONT ERROR FOR A NUCLEAR-REACTOR-PUMPED GAS-LASER SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID MOTION AB Taylor-series expansion coefficients are derived to fourth order for the density field of a gas undergoing fission-fragment pumping from a nuclear reactor. The density solutions are used to calculate the gain cell's index of refraction, internal ray paths, optical path differences, and focal lengths. The ray paths are shown to exhibit nearly random behavior near the gain cell's exit aperture, and the cell's focal lengths are shown to oscillate from + infinity to - infinity with astigmatic- and spherical-type aberrations present in the calculated output intensity. RP CORVO, A (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD AUG PY 1991 VL 8 IS 8 BP 1692 EP 1703 DI 10.1364/JOSAB.8.001692 PG 12 WC Optics SC Optics GA GA281 UT WOS:A1991GA28100021 ER PT J AU SMITH, DH COVATCH, GL LIM, KH AF SMITH, DH COVATCH, GL LIM, KH TI MORPHOLOGIES AND INVERSIONS OF EMULSIONS OF CONJUGATE MICROEMULSION AND OLEIC PHASES IN AN AMPHIPHILE OIL-WATER SYSTEM BETWEEN ITS CRITICAL END-POINT TEMPERATURES SO LANGMUIR LA English DT Article AB A study has been made of emulsions formed within the two-phase miscibility gap that borders the middle phase-top phase side of the tietriangle in an amphiphile/oil/water system (2-butoxyethanol/n-decane/aqueous 10 mM NaCl system at 35.0-degrees-C). The study includes emulsions formed by six different conjugate oleic-microemulsion phase-pairs, ranging from the top phase-bottom phase tieline to a tieline very close to the plait point. Electrical conductivity measurements were used to infer emulsion morphologies and to detect morphology changes (emulsion inversions). The results are compared to the dispersion morphology diagram previously postulated for amphiphile/oil/water systems. C1 UNIV OKLAHOMA,INST APPL SURFACTANT RES,NORMAN,OK 73019. US DOE,MORGANTOWN ENERGY TECHNOL CTR,MORGANTOWN,WV 26507. NR 23 TC 19 Z9 19 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD AUG PY 1991 VL 7 IS 8 BP 1585 EP 1589 DI 10.1021/la00056a008 PG 5 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA GC040 UT WOS:A1991GC04000008 ER PT J AU SKLAR, LA AF SKLAR, LA TI NATIONAL LABORATORY PROVIDES LASER RESOURCE IN CYTOMETRY SO LASER FOCUS WORLD LA English DT Article C1 UNIV NEW MEXICO, SCH MED, PATHOL, ALBUQUERQUE, NM 87131 USA. RP SKLAR, LA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB, NATL FLOW CYTOMETRY RESOURCE, LOS ALAMOS, NM 87545 USA. NR 3 TC 2 Z9 2 U1 0 U2 0 PU PENNWELL PUBL CO PI NASHUA PA 98 SPIT BROOK RD, NASHUA, NH 03062-2801 USA SN 1043-8092 J9 LASER FOCUS WORLD JI Laser Focus World PD AUG PY 1991 VL 27 IS 8 BP 61 EP + PG 1 WC Optics SC Optics GA GB040 UT WOS:A1991GB04000011 ER PT J AU ERLANDSON, AC POWELL, HT AF ERLANDSON, AC POWELL, HT TI 10,000 FLASHLAMPS WILL DRIVE MOST-POWERFUL LASER SO LASER FOCUS WORLD LA English DT Article C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,ICF PROGRAM,LIVERMORE,CA 94550. RP ERLANDSON, AC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,POB 5508,L-493,LIVERMORE,CA 94550, USA. NR 10 TC 0 Z9 1 U1 1 U2 4 PU PENNWELL PUBL CO PI NASHUA PA 5TH FLOOR TEN TARA BOULEVARD, NASHUA, NH 03062-2801 SN 0740-2511 J9 LASER FOCUS WORLD JI Laser Focus World PD AUG PY 1991 VL 27 IS 8 BP 95 EP 100 PG 6 WC Optics SC Optics GA GB040 UT WOS:A1991GB04000013 ER PT J AU FREERICKS, JK FALICOV, LM AF FREERICKS, JK FALICOV, LM TI ENLARGED SYMMETRY GROUPS OF FINITE-SIZE CLUSTERS WITH PERIODIC BOUNDARY-CONDITIONS SO LETTERS IN MATHEMATICAL PHYSICS LA English DT Article ID HEAVY-FERMION SYSTEM; MANY-BODY SOLUTION; HUBBARD-MODEL; HEISENBERG-MODEL; DIAMOND AB Any system that approximates an infinite lattice by a family of finite clusters (with periodic boundary conditions) passes through an intermediate region with enlarged (hidden) symmetry as the system size is increased. The hidden symmetry allows for extra degeneracies and level crossings and has application to exact-diagonalization studies, Monte Carlo simulations, lattice gauge theories, and renormalization group calculations. C1 UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. RP FREERICKS, JK (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Freericks, James/D-7502-2011; OI Freericks, James/0000-0002-6232-9165 NR 28 TC 0 Z9 0 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0377-9017 J9 LETT MATH PHYS JI Lett. Math. Phys. PD AUG PY 1991 VL 22 IS 4 BP 277 EP 285 DI 10.1007/BF00405602 PG 9 WC Physics, Mathematical SC Physics GA GM136 UT WOS:A1991GM13600003 ER PT J AU KESTI, J AF KESTI, J TI MLA WORKS SMARTER SO LIBRARY JOURNAL LA English DT Editorial Material RP KESTI, J (reprint author), US DOE,CENT TRAINING ACAD,ALBUQUERQUE,NM 87115, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BOWKER MAGAZINE GROUP CAHNERS MAGAZINE DIVISION PI NEW YORK PA 249 W 17TH ST, NEW YORK, NY 10011 SN 0363-0277 J9 LIBR J JI Libr. J. PD AUG PY 1991 VL 116 IS 13 BP 59 EP 60 PG 2 WC Information Science & Library Science SC Information Science & Library Science GA GB038 UT WOS:A1991GB03800021 ER PT J AU ERCK, RA FENSKE, GR AF ERCK, RA FENSKE, GR TI ADHESION OF SILVER FILMS TO ION-BOMBARDED ZIRCONIA SO LUBRICATION ENGINEERING LA English DT Article AB The effects of ion-bombardment on thin film adhesion are not well understood for many metal-ceramic systems. Electron-beam-evaporated silver films were deposited on zirconia substrates either directly on the sputter-cleaned substrate or with the use of a bonding interlayer, and film adhesion was measured with a pull-type tester. Argon- and argon/oxygen-ion presputtering produced large increases in adhesion strength, the greatest occurring for the oxygen-ion assist. Deposition of a reactive Cr or Ti intermediate layer also produced large adhesion increases, with Cr the most effective. RP ERCK, RA (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,TRIBOL GRP,ARGONNE,IL 60439, USA. NR 0 TC 7 Z9 7 U1 0 U2 1 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 838 BUSSE HIGHWAY, PARK RIDGE, IL 60068 SN 0024-7154 J9 LUBR ENG JI Lubric. Eng. PD AUG PY 1991 VL 47 IS 8 BP 640 EP 644 PG 5 WC Engineering, Mechanical SC Engineering GA GB868 UT WOS:A1991GB86800005 ER PT J AU SENOR, DJ PEDDICORD, KL AF SENOR, DJ PEDDICORD, KL TI EFFECTS OF HYDROGEN ON THE FRACTURE MORPHOLOGY OF INCONEL 718 SO MATERIALS LETTERS LA English DT Article ID EMBRITTLEMENT AB Many materials display a tendency to embrittle when subjected to a hydrogen environment. This behavior is extremely material specific and there is no reliable method for the prediction of embrittlement in previously untested materials. It is therefore necessary to experimentally determine the effects of hydrogen on materials which may experience such an environment during their service life. Inconel 718 has many applications in the aerospace industry and as a result may encounter a high partial pressure hydrogen environment. In this study, fractured Inconcel 718 tensile samples were examined in a scanning electron microscope to determine the effects of atmosphere on their fracture surfaces. Two base metal and two weld specimens were examined, one of each tested in 6.9 MPa helium or hydrogen atmospheres at room temperature. No evidence of embrittlement was noted for the base metal samples, while the weld samples were slightly embrittled. The effect was minor, however, and the fracture mode in all four cases was ductile microvoid coalescence. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP SENOR, DJ (reprint author), TEXAS A&M UNIV SYST,DEPT NUCL ENGN,ADV NUCL FUELS LAB,COLLEGE STN,TX 77843, USA. NR 6 TC 1 Z9 1 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD AUG PY 1991 VL 11 IS 10-12 BP 373 EP 378 DI 10.1016/0167-577X(91)90137-U PG 6 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA GD711 UT WOS:A1991GD71100014 ER PT J AU BHADESHIA, HKDH DAVID, SA VITEK, JM REED, RW AF BHADESHIA, HKDH DAVID, SA VITEK, JM REED, RW TI STRESS-INDUCED TRANSFORMATION TO BAINITE IN FE-CR-MO-C PRESSURE-VESSEL STEEL SO MATERIALS SCIENCE AND TECHNOLOGY LA English DT Article ID MECHANICAL-PROPERTIES; MICROSTRUCTURE AB The kinetics of the bainitic transformation in a polycrystalline Fe-Cr-Mo-C alloy designed for applications in energy generation systems has been studied, with particular attention to the influence of mild tensile stresses on transformation behaviour. The steel was found to exhibit the incomplete reaction phenomenon, in which transformation to bainite stops well before the residual austenite acquires its paraequilibrium carbon concentration. It was found that even in the absence of an applied stress, the growth of bainitic ferrite caused anisotropic changes in specimen dimensions, consistent with the existence of crystallographic texture in its austenitic condition and, significantly, with the nature of the invariant-plane strain shape change that accompanies the growth of bainitic ferrite. Thus, transformation induced plasticity could be detected in fine grained polycrystalline samples, even in the absence of applied stress. The application of an external stress was found to alter radically the transformation behaviour, with clear evidence that the stress tends to favour the development of certain crystallographic variants of bainite, even though the stress may be well below the single phase yield strength. It is concluded that the transformation is influenced significantly by stresses as low as 45 MN m-2, even though the effect may not be obvious in metallographic studies. The results are analysed and discussed in terms of the mechanism of the bainite transformation. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN. NR 53 TC 122 Z9 123 U1 2 U2 17 PU INST MATERIALS PI LONDON PA 1 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5DB SN 0267-0836 J9 MATER SCI TECH SER JI Mater. Sci. Technol. PD AUG PY 1991 VL 7 IS 8 BP 686 EP 698 PG 13 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GG407 UT WOS:A1991GG40700002 ER PT J AU MAYERKRESS, G AF MAYERKRESS, G TI NONLINEAR DYNAMICS, CHAOS, COMPUTER GAMES, AND SCIENTIFIC VISUALIZATION IN THE BEHAVIORAL-SCIENCES SO MATHEMATICAL SOCIAL SCIENCES LA English DT Meeting Abstract C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544. UNIV CALIF SANTA CRUZ,DEPT MATH,SANTA CRUZ,CA 95064. 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 0165-4896 J9 MATH SOC SCI JI Math. Soc. Sci. PD AUG PY 1991 VL 22 IS 1 BP 97 EP 97 DI 10.1016/0165-4896(91)90070-8 PG 1 WC Economics; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Business & Economics; Mathematics; Mathematical Methods In Social Sciences GA GR730 UT WOS:A1991GR73000007 ER PT J AU ZIMMERMAN, RW AF ZIMMERMAN, RW TI ELASTIC-MODULI OF A SOLID CONTAINING SPHERICAL INCLUSIONS SO MECHANICS OF MATERIALS LA English DT Article AB The differential method is used to calculate the elastic moduli of a solid that contains a random distribution of spherical inclusions. Closed-form solutions are obtained for the two limiting cases of rigid inclusions and vacuous pores. These solutions obey the Hashin-Shtrikman bounds, and reduce to the correct values as the inclusion concentration approaches 0 or 1. The predictions are compared with data from the literature, and are shown to be very accurate over wide ranges of the inclusion concentration. RP ZIMMERMAN, RW (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. OI Zimmerman, Robert/0000-0001-6674-3403 NR 0 TC 133 Z9 139 U1 0 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6636 J9 MECH MATER JI Mech. Mater. PD AUG PY 1991 VL 12 IS 1 BP 17 EP 24 DI 10.1016/0167-6636(91)90049-6 PG 8 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA GH638 UT WOS:A1991GH63800002 ER PT J AU LAIRD, G NIELSEN, RL MACMILLAN, NH AF LAIRD, G NIELSEN, RL MACMILLAN, NH TI ON THE NATURE OF EUTECTIC CARBIDES IN CR-NI WHITE CAST IRONS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID EQUILIBRIA; ALLOYS AB The mechanical and tribological properties of white cast irons are strongly dependent on whether they contain M7C3 or M3C carbides (M = Fe, Cr, etc.). In an effort to improve the wear resistance of such materials, the United States Bureau of Mines has studied the effects of adding 0.3 to 2.3 wt pct (throughout) Si to hypoeutectic irons containing approximately 8.5 pct Cr and 6.0 pct Ni. The eutectic carbides formed were identified by electron microprobe analysis, X-ray diffraction, and scanning electron (SEM) and optical microscopies. In addition, differential thermal analysis (DTA) was used to study the process of solidification. At Si contents of 0.3 and 1.2 pct, the eutectic carbides exhibited a duplex structure, consisting of cores of M7C3 surrounded by shells of M3C. Additionally, the microstructure contained ledeburite (M3C + gamma-Fe (austenite)). At the higher Si content of 1.6 pct, the eutectic carbides consisted entirely of M7C3, and some ledeburite remained. Last, when the Si content was raised to 2.3 pct, the eutectic carbides again consisted entirely of M7C3, but ledeburite was no longer formed. These observations can be explained in terms of the effects of Si and, to a lesser extent, of Ni on the shape of the liquidus surface of the metastable Fe-Cr-C phase diagram. The addition of Si reduces the roles played by the four-phase class IIp reaction L + M7C3 --> M3C + gamma-Fe and the ledeburitic eutectic reaction L --> M3C + gamma-Fe in the overall process of solidification. C1 ALFRED UNIV, NEW YORK STATE COLL CERAM, ALFRED, NY 14802 USA. OREGON STATE UNIV, COLL OCEANOG, CORVALLIS, OR 97331 USA. RP US BUR MINES, ALBANY RES CTR, ALBANY, OR 97321 USA. NR 26 TC 13 Z9 14 U1 2 U2 7 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 0360-2133 J9 METALL TRANS A PD AUG PY 1991 VL 22 IS 8 BP 1709 EP 1720 DI 10.1007/BF02646494 PG 12 WC Materials Science, Multidisciplinary SC Materials Science GA GA563 UT WOS:A1991GA56300002 ER PT J AU CHU, D MORRIS, JW AF CHU, D MORRIS, JW TI THE EFFECT OF THROUGH-THICKNESS ANISOTROPY ON THE CRYOGENIC MECHANICAL-PROPERTIES OF AN AL-CU-LI-ZR ALLOY (VINTAGE-III 2090-T81) SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID ALUMINUM-LITHIUM ALLOYS; TOUGHNESS AB The cryogenic mechanical properties of a 12.7-mm (0.5-in.) Vintage III 2090-T81 (Al-3.05Cu-2.16Li-0.11Zr by weight) plate material were studied. The results indicate that the through-thickness anisotropy in the yield strength of Vintage I 2090-T81 is reduced in the Vintage III material by utilizing a partial recrystallization step during the thermomechanical processing but at some cost to the elongation and cryogenic fracture toughness. Sharp discontinuities in the microstructure resulting from this thermomechanical treatment give rise to distinct differences in the variation of the work hardening behavior with temperature between those regions which undergo recrystallization and those which do not. The lower elongations observed in Vintage III 2090-T81 result from a decrease in work hardenability that appears to be associated with increased slip heterogeneity. The reduced cryogenic toughness is due, in part, to the disruption of the monolithic unrecrystallized grain structure previously observed in Vintage I 2090-T81. The results suggest that a fully unrecrystallized structure is beneficial for cryogenic toughness in the longitudinal orientation. C1 UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP CHU, D (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720, USA. NR 25 TC 4 Z9 6 U1 1 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD AUG PY 1991 VL 22 IS 8 BP 1789 EP 1799 DI 10.1007/BF02646503 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA GA563 UT WOS:A1991GA56300011 ER PT J AU LARSON, RS AF LARSON, RS TI ON THE KINETICS OF DIFFUSION-LIMITED LAYER GROWTH IN SOLID-SOLID SYSTEMS SO METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY LA English DT Article AB The diffusion-limited growth of an intermediate layer between two saturated solid solutions is investigated theoretically. It is shown that conventional approaches based on Fick's law alone can give rise to significant errors if the partial molar volumes of the diffusing species are not constant, because the contribution of bulk flow to the species fluxes is not accounted for. New expressions for layer growth rates in spherical and planar geometries are derived, subject to the condition that the mass or molar density of the new phase is uniform. These results are seen to reduce formally to the standard expressions under appropriate limiting conditions. It is concluded that the old and new approaches are complementary, each being valid under a particular set of circumstances. RP LARSON, RS (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 10 TC 2 Z9 2 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 AUG PY 1991 VL 22 IS 4 BP 523 EP 527 DI 10.1007/BF02654291 PG 5 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA GA233 UT WOS:A1991GA23300014 ER PT J AU KNIZE, MG HOPMANS, E HAPPE, JA AF KNIZE, MG HOPMANS, E HAPPE, JA TI THE IDENTIFICATION OF A NEW HETEROCYCLIC AMINE MUTAGEN FROM A HEATED MIXTURE OF CREATINE, GLUTAMIC-ACID AND GLUCOSE SO MUTATION RESEARCH LA English DT Article DE HETEROCYCLIC AMINE MUTAGEN; AIA, AMINO-IMIDAZO-AZA-ARENE ID BEEF; MEAT AB A new heterocyclic amine mutagen was isolated from a dry-heated reaction of the natural meat components creatine, glutamic acid and glucose. Heating creatine and glutamic acid alone had only one seventh of the Ames/Salmonella mutagenic activity of the glucose, creatine and glutamic acid mixture. The major mutagenic compound was purified by HPLC using the Ames/Salmonella test to guide the purification. The mutagen has a molecular weight of 244 and a composition of C12H12N4O2 as determined by high-resolution mass spectrometry. NMR and IR spectral data suggest the structure is a 2,6-diamino-3,4-dimethyl-7-oxo-pyrano[4,3-g]benzimidazole. Mutagenic activity in strains TA1538, TA98 and TA100, was approximately 7000, 5200, and 550 revertants per microgram, respectively. The formation of this mutagen from natural meat components suggests that it may be present in cooked food. The preferential formation of this mutagen with glucose shows that glucose can be important in dry-heated mutagen-forming reactions. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV CONDENSED MATTER & ANALYT SCI,LIVERMORE,CA 94550. AGR UNIV WAGENINGEN,DEPT TOXICOL,6703 HD WAGENINGEN,NETHERLANDS. RP KNIZE, MG (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,DIV BIOMED SCI,POB 5507,LIVERMORE,CA 94550, USA. FU NCPDCID CDC HHS [NCI RO140811]; NIEHS NIH HHS [222YO1-ES-70158] NR 17 TC 18 Z9 18 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-8262 J9 MUTAT RES PD AUG PY 1991 VL 260 IS 4 BP 313 EP 319 DI 10.1016/0165-1218(91)90016-F PG 7 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA GB570 UT WOS:A1991GB57000004 PM 1678491 ER PT J AU MCFEE, AF ROBERTSON, SD ABBOTT, MG AF MCFEE, AF ROBERTSON, SD ABBOTT, MG TI RECOVERY OF POLYCHROMATIC ERYTHROCYTES AND MICRONUCLEI FOLLOWING CELLULOSE COLUMN SEPARATION OF MOUSE BONE-MARROW SAMPLES SO MUTATION RESEARCH LA English DT Article DE MICRONUCLEI; POLYCHROMATIC ERYTHROCYTES; COLUMN SEPARATION; MOUSE MARROW; ERYTHROCYTES, ANUCLEAR POLYCHROMATIC ID ASSAY RP MCFEE, AF (reprint author), OAK RIDGE ASSOCIATED UNIV,DIV MED SCI,POB 117,OAK RIDGE,TN 37831, USA. FU NIEHS NIH HHS [Y01-ES-20100] NR 13 TC 8 Z9 8 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 AUG PY 1991 VL 260 IS 4 BP 387 EP 391 DI 10.1016/0165-1218(91)90024-G PG 5 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA GB570 UT WOS:A1991GB57000012 PM 1870627 ER PT J AU GENEROSO, WM CAIN, KT CORNETT, CV FROME, EL AF GENEROSO, WM CAIN, KT CORNETT, CV FROME, EL TI COMPARISON OF 2 STOCKS OF MICE IN SPERMATOGONIAL RESPONSE TO DIFFERENT CONDITIONS OF RADIATION EXPOSURE SO MUTATION RESEARCH LA English DT Article DE MOUSE; SPERMATOGONIA; RECIPROCAL TRANSLOCATIONS; EMBRYO LETHALS; RADIATION EXPOSURE ID RAY-INDUCED TRANSLOCATIONS; STEM-CELL SPERMATOGONIA; FRACTIONATION RESPONSES; HYBRID STOCKS; MOUSE AB In a previous report (Generoso et al., 1985) it was shown that the two hybrid stocks of mice, (C3H/R1 x 101/R1)F1 and (SEC/R1 x C57BL/6)F1, differed in their responses to induction of chromosomal aberrations following exposure of the stem-cell spermatogonia to 500 R x 4 (4-week intervals) acute X-rays. The levels of response in the two stocks were paralleled by the effects on the length of the sterile period, which presumably results from stem-cell killing and repopulation. The present study was conducted in order to determine whether the differences between the two stocks in these parameters hold true also for other conditions of radiation exposure. Thus, comparative experiments were conducted using the following acute exposure regimens: 500 R single dose, 500 R + 500 R (24-h interval), 100 R + 900 R (24-h interval), and 500 R x 4 (8-week intervals). The endpoints measured were chromosome rearrangements in diakinesis/ metaphase-I meiocytes, embryonic lethality in conceptuses, length of sterile period and testis weight. Trend analysis indicated that higher frequencies of chromosome rearrangements and embryonic lethality were recovered from (C3H/R1 x 101/R1)F1 than from (SEC/R1 x C57BL/6)F1 males, that there were no significant differences between stocks in testis weight reductions, and that there was no consistency in the direction of the significant differences that occurred in the length of the sterile period. A definitive conclusion regarding the possible association between induction of chromosomal aberrations and induction of cell killing awaits direct histological analysis of the stem-cell population. C1 OAK RIDGE NATL LAB,DIV ENGN PHYS & MATH,OAK RIDGE,TN 37731. RP GENEROSO, WM (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37731, USA. NR 21 TC 2 Z9 2 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 AUG PY 1991 VL 249 IS 2 BP 301 EP 310 DI 10.1016/0027-5107(91)90004-8 PG 10 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA FZ987 UT WOS:A1991FZ98700004 PM 2072973 ER PT J AU SEGA, GA BRIMER, PA GENEROSO, EE AF SEGA, GA BRIMER, PA GENEROSO, EE TI ETHYLENE-OXIDE INHALATION AT DIFFERENT EXPOSURE-RATES AFFECTS BINDING LEVELS IN MOUSE GERM-CELLS AND HEMOGLOBIN - POSSIBLE EXPLANATION FOR THE EFFECT SO MUTATION RESEARCH LA English DT Article DE ETHYLENE OXIDE; EXPOSURE RATE; INHALATION EXPOSURE; GERM CELLS; MOLECULAR DOSIMETRY ID UNSCHEDULED DNA-SYNTHESIS; MALE-MICE; METHANESULFONATE; ETHYLATION; INDUCTION; PROTAMINE; DOSIMETRY AB Male mice were exposed to [H-3]EtO by inhalation at different exposure rates (300 parts per million (ppm) of EtO for 1 h; 150 ppm for 2 h; 75 ppm for 4 h). The total exposure was fixed at 300 ppm-h. The amount of EtO binding to developing spermatogenic stages, to sperm DNA, to testis DNA and to hemoglobin was then measured as a function of the EtO exposure rate. Generally, as the exposure rate increased there was an increase in the amount of EtO binding to the targets. For example, alkylation of sperm from the caudal epididymides 6 d posttreatment, of DNA from the vas sperm (averaged over 4 time points), of testis DNA (90 min posttreatment), and of hemoglobin (averaged over 4 time points), was 2.0 +/- 0.2 (SD), 1.8 +/- 0.4, 2.9 +/- 0.3, and 1.5 +/- 0.1 times greater, respectively, after an exposure to 300 ppm for 1 h than after an exposure to 75 ppm for 4 h. The testicular DNA from animals exposed to 300 ppm of [H-3]EtO for 1 h was also analyzed for the presence of N7-hydroxyethylguanine (N7HEG) and O6-hydroxyethylguanine (O6HEG). The half-life (T1/2) of the N7HEG in the testis DNA was calculated to be 2.8 d. This lesion was removed relatively rapidly from the testis DNA and was probably excised by enzymatic repair. No formation of O6HEG was detected in any of the testis DNA samples analyzed. Additional experiments showed that the exposure rate effect was the result of less total EtO being taken in by the mice over long exposure times compared to that taken in during shorter exposure times at higher concentrations. This result argues against the idea that the exposure rate effect is the result of physiological/enzymological changes affecting transport or metabolism of the chemical within the animals under different exposure rate conditions. RP SEGA, GA (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831, USA. NR 11 TC 14 Z9 15 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 AUG PY 1991 VL 249 IS 2 BP 339 EP 349 DI 10.1016/0027-5107(91)90009-D PG 11 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA FZ987 UT WOS:A1991FZ98700009 PM 2072977 ER PT J AU SELBY, PB LEE, SS KELLY, EM BANGHAM, JW RAYMER, GD HUNSICKER, PR AF SELBY, PB LEE, SS KELLY, EM BANGHAM, JW RAYMER, GD HUNSICKER, PR TI SPECIFIC-LOCUS EXPERIMENTS SHOW THAT FEMALE MICE EXPOSED NEAR THE TIME OF BIRTH TO LOW-LET IONIZING-RADIATION EXHIBIT BOTH A LOW MUTATIONAL RESPONSE AND A DOSE-RATE EFFECT SO MUTATION RESEARCH LA English DT Article DE SPECIFIC-LOCUS MUTATIONS; OOCYTES; (RADIATION); NEWBORN; FETUSES ID GENETIC HAZARDS; OOCYTES; FREQUENCIES AB Female mice were exposed to 300 R of 73-93 R/min X-radiation either as fetuses at 18.5 d post conception (p.c.) or within 9 h after birth. Combining the similar results from these two groups yielded a specific-locus mutation frequency of 9.4 x 10(-8) mutation/locus/R, which is statistically significantly higher than the historical-control mutation frequency, but much lower than the rate obtained by irradiating mature and maturing oocytes in adults. Other females, exposed at 18.5 days p.c. to 300 R of 0.79 R/min gamma-radiation, yielded a mutation frequency that was statistically significantly lower than the frequency at high dose rates. The low-dose-rate group also had markedly higher fertility. It appears that the dose-rate effect for mutations induced near the time of birth may be more pronounced than that reported for mature and maturing oocytes of adults. A hypothesis sometimes advanced to explain low mutation frequencies recovered from cell populations that experience considerable radiation-induced cell killing is that there is selection against mutant cells. The reason for the relatively low mutational response following acute irradiation in our experiments is unknown; however, the finding of a dose-rate effect in these oocytes in the presence of only minor radiation-induced cell killing (as judged from fertility) makes it seem unlikely that selection was responsible for the low mutational response following acute exposure. Had selection been an important factor, the mutation frequency should have increased when oocyte killing was markedly reduced. RP SELBY, PB (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,MS 8077,OAK RIDGE,TN 37831, USA. NR 33 TC 7 Z9 7 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 AUG PY 1991 VL 249 IS 2 BP 351 EP 367 DI 10.1016/0027-5107(91)90010-L PG 17 WC Genetics & Heredity; Toxicology SC Genetics & Heredity; Toxicology GA FZ987 UT WOS:A1991FZ98700010 PM 2072978 ER PT J AU HALL, JN AF HALL, JN TI COMPARISON OF FUEL CONSUMPTION BETWEEN HIGH-INTENSITY AND MODERATE INTENSITY FIRES IN LOGGING SLASH SO NORTHWEST SCIENCE LA English DT Article; Proceedings Paper CT GEORGE FAHNESTOCK MEMORIAL FIRE SCIENCE SYMP AT THE 1990 ANNUAL MEETING OF THE NORTHWEST SCIENTIFIC ASSOC CY MAY, 1990 CL CORVALLIS, OR SP NW SCI ASSOC AB Slash burning is an integral tool of forest management in the Pacific Northwest. The purpose of this study was to determine if mass-ignited, high intensity fires had less fuel consumption than moderate intensity fires. There was 23 percent less woody fuel consumption in high intensity burns than in moderate intensity burns. A hypothetical maximum consumption rate model was derived for high intensity fires. High intensity fires could be used to reduce emissions from slash burning, thereby diminishing one of its adverse effects. RP HALL, JN (reprint author), PACIFIC NW LAB, RES STN, FORESTRY SCI LAB, 4043 ROOSEVELT WAY NE, SEATTLE, WA 98105 USA. NR 0 TC 8 Z9 8 U1 0 U2 2 PU WASHINGTON STATE UNIV PI PULLMAN PA PO BOX 645910, PULLMAN, WA 99164-5910 SN 0029-344X J9 NORTHWEST SCI JI Northwest Sci. PD AUG PY 1991 VL 65 IS 4 BP 158 EP 165 PG 8 WC Ecology SC Environmental Sciences & Ecology GA GH267 UT WOS:A1991GH26700004 ER PT J AU WANG, GJ SOM, P OSTER, ZH VOLKOW, ND AF WANG, GJ SOM, P OSTER, ZH VOLKOW, ND TI EVALUATION OF COCAINE-INDUCED HEPATOTOXICITY SO NUC COMPACT-EUROPEAN-AMERICAN COMMUNICATIONS IN NUCLEAR MEDICINE LA English DT Article DE COCAINE, HEPATOTOXICITY; TC-99M DISIDA; TC-99M SC; RADIONUCLIDES AB The effect of repeated administrations (1.5 weeks) of cocaine on the liver was studied using two radiopharmaceuticals, Tc-99m sulfur colloid (SC) and Tc-99m DISIDA. Uptake and clearance kinetics as well as liver enzyme determinations and histopathology were compared. In cocaine-treated animals hepatomegaly was noted (36% increase in liver weight over non-treated animals), and SGPT levels were 5 times higher than in non-treated animals. Periportal necrosis, fatty infiltration, and inflammation were noted on histological sections. The total uptake of Tc-99m SC in cocaine-treated mice was 8% higher, but the concentration (%ID/gm) was 18% lower, than in non-treated animals. Decreased uptake and concentration of Tc-99m SC was seen in the spleen. In contrast, the uptake and clearance of Tc-99m DISIDA were not affected by cocaine treatment. It is concluded that in this model Tc-99m DISIDA was not a sensitive agent for evaluation of cocaine-induced hepatotoxicity, and that Tc-99m SC was a more sensitive agent for the determination of hepatic and splenic toxicity due to cocaine. Cocaine-mediated hepato-splenic toxicity warrants further clinical investigations. C1 BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. NR 0 TC 3 Z9 3 U1 0 U2 0 PU G-I-T VERLAG ERNST GIEBELER PI 6100 DARMSTADT 11 PA ROBLERSTRABE 90 POSTFACH 11 05 64, W-6100 6100 DARMSTADT 11, GERMANY SN 0344-3752 J9 NUC COMPACT PD AUG PY 1991 VL 22 IS 2 BP 72 EP 75 PG 4 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA GY127 UT WOS:A1991GY12700008 ER PT J AU FARMER, JC GDOWSKI, GE MCCRIGHT, RD AHLUWAHLIA, HS AF FARMER, JC GDOWSKI, GE MCCRIGHT, RD AHLUWAHLIA, HS TI CORROSION MODELS FOR PERFORMANCE ASSESSMENT OF HIGH-LEVEL RADIOACTIVE-WASTE CONTAINERS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT CONF SEMINAR ON STRUCTURAL MECHANICS AND MATERIAL PROPERTIES IN RADIOACTIVE WASTE REPOSITORY TECHNOLOGY CY AUG 21-22, 1989 CL ANAHEIM, CA ID AUSTENITIC STAINLESS-STEELS; STRESS-CORROSION; ALPHA-BRASS; AMMONIACAL SOLUTIONS; LOCALIZED CORROSION; PIT INITIATION; CRACKING; COPPER; MECHANISM; NUCLEATION AB The present plan for disposal of high-level radioactive waste in the USA is to seal the waste in containers before emplacement in a geologic repository. A proposed site at Yucca Mountain, Nevada, is presently being evaluated for its suitability as a geologic repository. The containers will probably be made of either an austenitic or a copper-based alloy. Models of alloy degradation are being used to predict the long-term performance of the containers under repository conditions. The models are of uniform oxidation and corrosion, localized corrosion, and stress corrosion cracking, and are applicable to worst-case scenarios of container degradation. This paper reviews several of the models. C1 KMI ENERGY,LIVERMORE,CA. SCI & ENGN ASSOCIATES INC,LIVERMORE,CA. RP FARMER, JC (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 128 TC 6 Z9 6 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 AUG PY 1991 VL 129 IS 1 BP 57 EP 88 DI 10.1016/0029-5493(91)90329-G PG 32 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GE181 UT WOS:A1991GE18100007 ER PT J AU SANDERS, TL EWING, RI AF SANDERS, TL EWING, RI TI MAKING USE OF BURNUP CREDIT IN CASK DESIGN SO NUCLEAR ENGINEERING INTERNATIONAL LA English DT Article RP SANDERS, TL (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 0029-5507 J9 NUCL ENG INT JI Nucl. Eng. Int. PD AUG PY 1991 VL 36 IS 445 BP 34 EP 36 PG 3 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GD500 UT WOS:A1991GD50000009 ER PT J AU HIDALGO, C HARRIS, JH UCKAN, T BELL, JD CARRERAS, BA DUNLAP, JL DYER, GR RITZ, CP WOOTTON, AJ MEIER, MA RHODES, TL CARTER, K AF HIDALGO, C HARRIS, JH UCKAN, T BELL, JD CARRERAS, BA DUNLAP, JL DYER, GR RITZ, CP WOOTTON, AJ MEIER, MA RHODES, TL CARTER, K TI PLASMA FLUCTUATIONS NEAR THE SHEAR-LAYER IN THE ATF TORSATRON SO NUCLEAR FUSION LA English DT Article ID EDGE TURBULENCE; TOKAMAK EDGE; LANGMUIR PROBES; TRANSPORT; TEXT AB Electrostatic turbulence has been investigated in the edge region of the Advanced Toroidal Facility (ATF). A reversal in the poloidal phase velocity of the fluctuations has been observed (velocity shear) which determines a characteristic plasma radius. The location of this shear layer depends on the magnetic configuration, the limiter radius and the plasma conditions. Using the shear position as a reference point, the density fluctuation levels in ATF (currentless stellarator) are very similar to those previously reported in TEXT (ohmically heated tokamak), suggesting that the plasma current is not an important drive for the edge turbulence. The drives for the turbulence appear to be different inside and outside the shear location (a(shear)), with T(e) approximately/T(e) < n approximately/n in the scrape-off layer (r/a(shear) > 1) and possibly larger T(e) approximately/T(e) in the plasma edge (r/a(shear) < 1). There is a spatial decorrelation in the fluctuation at the shear location; this suggests that the poloidal shear flow has an important influence on the edge turbulence. The poloidal correlation length depends on local plasma parameters (e.g. velocity and temperature). When neutral beam injection is added, the high frequency components of n approximately increase. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN. UNIV TEXAS,FUS RES CTR,AUSTIN,TX 78712. RP HIDALGO, C (reprint author), ASOCIAC EURATOM,CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL,MADRID,SPAIN. NR 32 TC 52 Z9 52 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 AUG PY 1991 VL 31 IS 8 BP 1471 EP 1478 DI 10.1088/0029-5515/31/8/004 PG 8 WC Physics, Fluids & Plasmas SC Physics GA GH662 UT WOS:A1991GH66200004 ER PT J AU PHILLIPS, JA BAKER, DA GRIBBLE, RF MUNSON, CP AF PHILLIPS, JA BAKER, DA GRIBBLE, RF MUNSON, CP TI EXPERIMENTAL-OBSERVATIONS ON PLASMA CIRCUIT INTERACTIONS AND THEIR EFFECT ON LOW-FREQUENCY FLUCTUATIONS IN THE REVERSED FIELD PINCH ZT-40M SO NUCLEAR FUSION LA English DT Letter AB Experimental observations of the amplitude and frequency of low frequency magnetic field and soft X-ray fluctuations in the reversed field pinch (RFP) ZT-40M, which has toroidal and poloidal gaps in its stabilizing shell, have shown that for high values of the pinch parameter these fluctuations can be strongly affected by the configuration of the toroidal field circuit. Parallel connection of coil sections improves the toroidal flux uniformity, which results in a reduction of the fluctuation level, the toroidal loop voltage and the implied energy losses compared with those of coils connected in a series or series-parallel configuration. These results indicate that the operation of RFP experiments with shell gaps and field coils well removed from the plasma can be further improved by the addition of close fitting, parallel connected, low current coils. RP PHILLIPS, JA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87544, USA. NR 24 TC 2 Z9 2 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 AUG PY 1991 VL 31 IS 8 BP 1556 EP 1562 DI 10.1088/0029-5515/31/8/016 PG 7 WC Physics, Fluids & Plasmas SC Physics GA GH662 UT WOS:A1991GH66200016 ER PT J AU FESSENDEN, TJ FRIEDMAN, A AF FESSENDEN, TJ FRIEDMAN, A TI HEAVY-ION INERTIAL FUSION - REPORT ON THE INTERNATIONAL-SYMPOSIUM HELD AT MONTEREY, CALIFORNIA, UNITED-STATES-OF-AMERICA, 3-6 DECEMBER 1990 SO NUCLEAR FUSION LA English DT Editorial Material C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP FESSENDEN, TJ (reprint author), UNIV CALIF BERKELEY,BERKELEY,CA 94720, USA. NR 0 TC 6 Z9 6 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 AUG PY 1991 VL 31 IS 8 BP 1567 EP 1578 DI 10.1088/0029-5515/31/8/019 PG 12 WC Physics, Fluids & Plasmas SC Physics GA GH662 UT WOS:A1991GH66200019 ER PT J AU BENCIVELLI, W BERTOLUCCI, E BOTTIGLI, U DELGUERRA, A MAZZEI, D MESSINEO, A NELSON, WR RANDACCIO, P ROSSO, V RUSSO, P STEFANINI, A AF BENCIVELLI, W BERTOLUCCI, E BOTTIGLI, U DELGUERRA, A MAZZEI, D MESSINEO, A NELSON, WR RANDACCIO, P ROSSO, V RUSSO, P STEFANINI, A TI USE OF EGS4 FOR THE EVALUATION OF THE PERFORMANCE OF A SILICON DETECTOR FOR X-RAY DIGITAL RADIOGRAPHY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL WORKSHOP ON SILICON PIXEL DETECTORS FOR PARTICLES AND X-RAYS CY JUN 19-21, 1990 CL LEUVEN, BELGIUM SP INTERNUNIV MICRO ELECTR CTR LEUVEN AB The general-purpose EGS4 code has been used to evaluate the efficiency, the energy and the spatial resolution of a silicon crystal with double-side microstrips readout to detect X-rays in the diagnostic energy range (10-100 keV). A single crystal configuration, a sandwich arrangement with a high-Z converter foil in between two crystals and a multicrystal configuration have been investigated. The simulation with a low energy spectrum X-ray beam and a breast phantom has shown that this type of detector would be of valuable use in mammography applications: breast calcification with a diameter smaller than 500-mu-m can be easily identified. C1 UNIV PISA,DIPARTMENTO FIS,I-56100 PISA,ITALY. IST NAZL FIS NUCL,I-56010 SAN PIERO A GRADO,ITALY. IST NAZL FIS NUCL,I-09127 CAGLIARI,ITALY. IST NAZL FIS NUCL,I-80125 NAPLES,ITALY. UNIV CAGLIARI,INST FIS,I-09100 CAGLIARI,ITALY. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. NAPLES UNIV,DIPARTIMENTO SCI FIS,I-80125 NAPLES,ITALY. RP BENCIVELLI, W (reprint author), IST PATOL MED,V ROMA 1,I-56100 PISA,ITALY. RI bencivelli, walter/H-1898-2012; OI Bottigli, Ubaldo/0000-0002-0666-3433; Russo, Paolo/0000-0001-9409-0008 NR 9 TC 11 Z9 11 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 AUG 1 PY 1991 VL 305 IS 3 BP 574 EP 580 DI 10.1016/0168-9002(91)90159-N PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FY991 UT WOS:A1991FY99100013 ER PT J AU DEBUSSCHERE, I HEIJNE, EHM KRANER, HW AF DEBUSSCHERE, I HEIJNE, EHM KRANER, HW TI SILICON PIXEL DETECTORS - PROCEEDINGS OF THE 2ND INTERNATIONAL WORKSHOP ON SILICON PIXEL DETECTORS FOR PARTICLES AND X-RAYS LEUVEN, BELGIUM, JUNE 19-21, 1990 - PREFACE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Editorial Material C1 CERN,CH-1211 GENEVA 23,SWITZERLAND. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP DEBUSSCHERE, I (reprint author), INTERUNIV MICROELECT CTR,LOUVAIN,BELGIUM. 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD AUG 1 PY 1991 VL 305 IS 3 BP R3 EP R3 DI 10.1016/0168-9002(91)90145-G PG 1 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FY991 UT WOS:A1991FY99100001 ER PT J AU MIRKOVIC, D DIAMOND, DJ AF MIRKOVIC, D DIAMOND, DJ TI EFFECT OF FLUSHING BORON DURING A BOILING WATER-REACTOR ANTICIPATED TRANSIENT WITHOUT SCRAM SO NUCLEAR TECHNOLOGY LA English DT Article DE REACTIVITY ACCIDENT; BORON DILUTION; RELAP5 CODE AB An accident sequence in a boiling water reactor is studied in which there is a large reactivity insertion caused by the flushing of borated water from the core. This sequence can occur during an anticipated transient without scram after the injection of borated water from the standby liquid control system. The boron shuts down the power, but if there is a rapid depressurization of the vessel (e.g., because of the inadvertent actuation of the automatic depressurization system), large amounts of low-pressure, relatively cold, unborated water enters the vessel causing a rapid dilution and cooling. This study determines whether the reactivity addition caused by this flushing could lead to a power excursion that is sufficient to cause catastrophic fuel damage. Calculations are carried out using the RELAP5/MOD2 computer code under different assumptions regarding timing and availability of low-pressure pumps and with different reactivity coefficients. The results show that the fuel enthalpy rise is insufficient to cause catastrophic fuel damage, although less severe fuel damage might still be possible from overheating of the fuel cladding. C1 BROOKHAVEN NATL LAB,DEPT NUCL ENERGY,UPTON,NY 11973. BROOKHAVEN NATL LAB,DIV RISK EVALUAT,UPTON,NY 11973. NR 14 TC 0 Z9 0 U1 0 U2 0 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 AUG PY 1991 VL 95 IS 2 BP 162 EP 174 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FV810 UT WOS:A1991FV81000004 ER PT J AU FLETCHER, CD GHAN, LS AF FLETCHER, CD GHAN, LS TI THERMAL-HYDRAULIC SYSTEMS SAFETY ANALYSIS TO SUPPORT THE DESIGN PROCESS FOR THE ADVANCED NEUTRON SOURCE REACTOR SO NUCLEAR TECHNOLOGY LA English DT Article DE ADVANCED NEUTRON SOURCE; THERMAL-HYDRAULIC ANALYSIS; REACTOR DESIGN ANALYSIS AB Large thermal-hydraulic systems computer codes are most often applied to investigate safety issues in existing nuclear facilities. One such code is applied to aid the design process for a proposed state-of-the-art research reactor. The RELAP5 computer code is used to simulate system response to hypothetical loss-of-coolant accidents (LOCAs) in an early design of the Advanced Neutron Source (ANS). Among accident scenarios, a LOCA event is expected to be one of the most challenging to the ANS reactor core; similar analyses for other accident types are in progress. This is the first detailed study of ANS transient system response during accidents, and the outcome of the analysis is used to benefit the design process. The ANS model used is based on an early (preconceptual) cooling system design layout. This early design has since been superseded by an improved design that is partly based on the results of these studies. The calculated responses of the early design to representative LOCA events are described; the simulations indicate that fuel melting and damage would be experienced for medium and large breaks. The effectiveness of employing a gascharged accumulator on the primary coolant system for preventing fuel damage following medium- and large-break LOCAs is evaluated. As a result of this evaluation, the new ANS design incorporates such accumulators. Analysis uncertainties are addressed, and the findings from this study that were used for the next phase of ANS design are highlighted. RP FLETCHER, CD (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,ADV REACTOR DESIGN UNIT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 13 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 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD AUG PY 1991 VL 95 IS 2 BP 228 EP 246 PG 19 WC Nuclear Science & Technology SC Nuclear Science & Technology GA FV810 UT WOS:A1991FV81000009 ER PT J AU BARBEE, TW WEED, JW HOOVER, RB ALLEN, MJ LINDBLOM, JF ONEAL, RH KANKELBORG, CC DEFOREST, CE PARIS, ES WALKER, ABC WILLIS, TD GLUSKIN, E PIANETTA, P BAKER, PC AF BARBEE, TW WEED, JW HOOVER, RB ALLEN, MJ LINDBLOM, JF ONEAL, RH KANKELBORG, CC DEFOREST, CE PARIS, ES WALKER, ABC WILLIS, TD GLUSKIN, E PIANETTA, P BAKER, PC TI MULTISPECTRAL SOLAR TELESCOPE ARRAY .2. SOFT-X-RAY EUV REFLECTIVITY OF THE MULTILAYER MIRRORS SO OPTICAL ENGINEERING LA English DT Article DE X-RAY EUV OPTICS; MULTILAYER MIRRORS; X-RAY TELESCOPES; NORMAL INCIDENCE X-RAY OPTICS; TELESCOPE CALIBRATION ID PERFORMANCE; RAY/EUV; OPTICS AB We have developed seven compact soft x-ray/EUV (XUV) multilayer-coated and two compact FUV interference-film-coated Cassegrain and Ritchey-Chretien telescopes for a rocket-borne observatory, the Multi-Spectral Solar Telescope Array. We report here on extensive measurements of the efficiency and spectral bandpass of the XUV telescopes carried out at the Stanford Synchrotron Radiation Laboratory. C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,CTR SPACE SCI,HUNTSVILLE,AL 35812. STANFORD UNIV,CTR SPACE SCI & ASTROPHYS,STANFORD,CA 94305. ARGONNE NATL LAB,ARGONNE,IL 60439. STANFORD UNIV,STANFORD SYNCHROTRON RADIAT LAB,STANFORD,CA 94305. BAKER CONSULTING,WALNUT CREEK,CA 94596. RP BARBEE, TW (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 28 TC 13 Z9 14 U1 1 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1067 EP 1075 PG 9 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200004 ER PT J AU HOOVER, RB SHEALY, DL BRINKLEY, BR BAKER, PC BARBEE, TW WALKER, ABC AF HOOVER, RB SHEALY, DL BRINKLEY, BR BAKER, PC BARBEE, TW WALKER, ABC TI DEVELOPMENT OF THE WATER WINDOW IMAGING X-RAY MICROSCOPE UTILIZING NORMAL-INCIDENCE MULTILAYER OPTICS SO OPTICAL ENGINEERING LA English DT Article DE X-RAY EUV OPTICS; WATER WINDOW IMAGING; MULTILAYER X-RAY OPTICS; NORMAL-INCIDENCE MIRRORS; SCHWARZSCHILD OPTICS ID TELESCOPE AB We describe the development of the water window imaging x-ray microscope based on normal-incidence multilayer x-ray mirrors. The narrow bandpass response inherent in multilayer x-ray optics is accurately tuned to wavelengths within the "water window." Similar doubly-reflecting multilayer optical systems have been fabricated for our astronomical rocket-borne x-ray/EUV telescopes. Previous theoretical studies performed during the MSFC X-Ray Microscope Development Program established that high-resolution multilayer x-ray imaging microscopes are possible by using either spherical (Schwarzschild configuration) optics or aspherical configurations. These microscopes require ultrasmooth mirror substrates, which have been fabricated using advanced flow polishing methods. Hemlite-grade sapphire microscope optic substrates have been accurately figured and polished to a smoothness of 0.5-angstrom rms, as measured by the Zygo profilometer. We describe the current status of fabrication and testing of the optical and mechanical subsystems for the water window imaging x-ray microscope. This new instrument should yield images of carbon-based microstructures within living cells of unprecedented spatial resolution and contrast, without need for fixatives, dyes, and chemical additives. C1 UNIV ALABAMA,DEPT PHYS,BIRMINGHAM,AL 35294. UNIV ALABAMA,DEPT CELL BIOL & ANAT,BIRMINGHAM,AL 35294. BAKER CONSULTING,WALNUT CREEK,CA 94596. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. STANFORD UNIV,CTR SPACE SCI & ASTROPHYS,STANFORD,CA 94305. RP HOOVER, RB (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812, USA. RI Shealy, David/A-5299-2008 NR 25 TC 14 Z9 14 U1 0 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1086 EP 1093 DI 10.1117/12.55924 PG 8 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200007 ER PT J AU NEWNAM, BE AF NEWNAM, BE TI EXTREME ULTRAVIOLET FREE-ELECTRON LASER-BASED PROJECTION LITHOGRAPHY SYSTEMS SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT CONF ON X-RAY/EUV OPTICS FOR ASTRONOMY, MICROSCOPY, POLARIMETRY, AND PROJECTION LITHOGRAPHY CY JUL, 1990 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE FREE-ELECTRON LASERS; LITHOGRAPHY; PROJECTION OPTICS; SOFT X-RAY IMAGING; X-RAY EUV OPTICS ID SOFT-X-RAY; FEL OSCILLATOR; GENERATION; AMPLIFIER; PROGRAM; OPTICS AB Free-electron laser (FEL) sources, driven by rf linear accelerators, have the potential to operate in the extreme ultraviolet (XUV) spectral range with more than sufficient average power for high-volume projection lithography. For XUV wavelengths from 100 to 4 nm, such sources will enable the resolution limit of optical projection lithography to be extended from 0.25 to 0.05-mu-m with an adequate total depth of focus (1 to 2-mu-m). Recent developments of a photoinjector of very bright electron beams, high-precision magnetic undulators, and ring-resonator cavities raise our confidence that FEL operation below 100 nm is ready for prototype demonstration. We address the motivation for an XUV FEL source for commercial microcircuit production and its integration into a lithographic system, including reflecting reduction masks, reflecting XUV projection optics and alignment systems, and surface-imaging photoresists. RP NEWNAM, BE (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 53 TC 6 Z9 6 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1100 EP 1108 DI 10.1117/12.55914 PG 9 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200009 ER PT J AU SPILLER, E MCCORKLE, RA WILCZYNSKI, JS GOLUB, L NYSTROM, G TAKACS, PZ WELCH, C AF SPILLER, E MCCORKLE, RA WILCZYNSKI, JS GOLUB, L NYSTROM, G TAKACS, PZ WELCH, C TI NORMAL-INCIDENCE SOFT-X-RAY TELESCOPES SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT CONF ON X-RAY/EUV OPTICS FOR ASTRONOMY, MICROSCOPY, POLARIMETRY, AND PROJECTION LITHOGRAPHY CY JUL, 1990 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE X-RAY EUV OPTICS; MULTILAYER OPTICS; NORMAL INCIDENCE X-RAY TELESCOPES; X-RAY MIRRORS ID EXTREME-ULTRAVIOLET; SPECTRUM; MIRRORS; MULTILAYERS; CORONA AB Photos obtained during 5 min of observation time from the flight of our 25-cm-diam normal-incidence soft x-ray (lambda = 63.5 angstrom) telescope on September 11, 1989, are analyzed and the data are compared to the results expected from tests of the mirror surfaces. These tests cover a range of spatial periods from 25 cm to 1 angstrom. The photos demonstrate a resolution close to the photon shot noise limit and a reduction in the scattering of the multilayer mirror compared to a single surface for scattering angles above 1 arcmin, corresponding to surface irregularities with spatial periods below 10-mu-m. Our results are used to predict the possible performance of future telescopes: We conclude that sounding rocket observations might be able to reach a resolution around 0.1 arcsec. Higher resolutions will require flights of longer durations and improvements in mirror testing for the largest spatial periods. C1 CTR ASTROPHYS,CAMBRIDGE,MA 02138. BROOKHAVEN NATL LAB,UPTON,NY 11973. LOCKHEED MISSILES & SPACE CO INC,LAS CRUCES,NM 88004. RP SPILLER, E (reprint author), IBM CORP,THOMAS J WATSON RES CTR,POB 218,YORKTOWN HTS,NY 10598, USA. NR 33 TC 15 Z9 18 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1109 EP 1115 DI 10.1117/12.55915 PG 7 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200010 ER PT J AU DEFOREST, CE KANKELBORG, CC ALLEN, MJ PARIS, ES WILLIS, TD LINDBLOM, JF ONEAL, RH WALKER, ABC BARBEE, TW HOOVER, RB BARBEE, TW AF DEFOREST, CE KANKELBORG, CC ALLEN, MJ PARIS, ES WILLIS, TD LINDBLOM, JF ONEAL, RH WALKER, ABC BARBEE, TW HOOVER, RB BARBEE, TW TI MULTISPECTRAL SOLAR TELESCOPE ARRAY .5. TEMPERATURE DIAGNOSTIC RESPONSE TO THE OPTICALLY THIN SOLAR PLASMA SO OPTICAL ENGINEERING LA English DT Article DE X-RAY EUV OPTICS; MULTILAYER OPTICS; SOLAR CORONA; SOLAR PLASMA DIAGNOSTICS AB We have developed compact soft x-ray, extreme ultraviolet (EUV), and far-ultraviolet (FUV) multilayer coated telescopes for the study of the solar chromosphere, corona, and corona/solar wind interface. Because these systems operate at short wavelengths (approximately 40 angstrom < lambda < 1550 angstrom), the modest apertures of 40 to 127 mm allow observations at very high angular resolution (0.1 to 0.7 arcsec). In addition to permitting traditional normal incidence optical configurations (such as Cassegrain, Ritchey-Chretien, and Herschelian configurations) to be used at soft x-ray/EUV wavelengths, multilayer coatings also allow a narrow wavelength band (lambda/DELTA-lambda approximately 15-100) to be selected for imaging. The resulting telescopes provide a very powerful and flexible diagnostic instrument for the study of both the fine-scale structure of the chromosphere/corona interface and the large-scale structure of the corona and corona/solar wind interface. In previous papers, we have described a new solar rocket payload, the Multi-Spectral Solar Telescope Array (MSSTA), which is composed of 17 of these compact telescopes. In the present paper, we report on the ability of the MSSTA payload to obtain temperature diagnostic information about the optically thin solar plasma. We also discuss applications of this information to studies of coronal structure. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. UNIV CALIF BERKELEY,BERKELEY,CA 94720. RP DEFOREST, CE (reprint author), STANFORD UNIV,CTR SPACE SCI & ASTROPHYS,STANFORD,CA 94305, USA. NR 12 TC 10 Z9 10 U1 0 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1125 EP 1133 DI 10.1117/12.55911 PG 9 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200012 ER PT J AU LINDBLOM, JF ONEAL, RH WALKER, ABC POWELL, FR BARBEE, TW HOOVER, RB POWELL, SF AF LINDBLOM, JF ONEAL, RH WALKER, ABC POWELL, FR BARBEE, TW HOOVER, RB POWELL, SF TI MULTISPECTRAL SOLAR TELESCOPE ARRAY .4. THE SOFT-X-RAY AND EXTREME ULTRAVIOLET FILTERS SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT CONF ON X-RAY/EUV OPTICS FOR ASTRONOMY, MICROSCOPY, POLARIMETRY, AND PROJECTION LITHOGRAPHY CY JUL, 1990 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE X-RAY EUV OPTICS; X-RAY FILTERS; X-RAY WINDOWS; THIN METAL FOILS AB The multilayer mirrors used in the normal-incidence optical systems of the Multi-Spectral Solar Telescope Array (MSSTA) are efficient reflectors for soft x-ray/extreme ultraviolet (EUV) radiation at wavelengths that satisfy the Bragg condition, thus allowing a narrow band of the soft x-ray/EUV spectrum to be isolated. However, these same mirrors are also excellent reflectors in the visible, ultraviolet, and far-ultraviolet (FUV) part of the spectrum, where normal incidence reflectivities can exceed 50%. Furthermore, the sun emits far more radiation in the ultraviolet and visible part of the spectrum than it does in the soft x-ray/EUV. For this reason, thin foil filters are employed to eliminate the unwanted longer wavelength solar emission. With the proper choice of filter materials, the filters can also be used to eliminate EUV radiation at longer wavelengths, where the increasing specular reflectivity of multilayer mirrors and the high intensity of solar emissions can cause "contamination" of the image in the narrow band defined by the Bragg condition. In addition, filters can eliminate higher order multilayer reflections. Finally, filter absorption edges can sometimes be utilized to reduce the width of the primary bandpass. The MSSTA instrument uses various combinations of thin foil filters composed of aluminum, carbon, tellurium, potassium bromide, beryllium, molybdenum, rhodium, and phthalocyanine to achieve the desired radiation rejection characteristics. We discuss issues concerning the design, manufacture, and predicted performance of MSSTA filters. C1 LUXEL CORP,FRIDAY HARBOR,WA 98250. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. STANFORD UNIV,DEPT MAT SCI & ENGN,STANFORD,CA 94305. RP LINDBLOM, JF (reprint author), STANFORD UNIV,CTR SPACE SCI & ASTROPHYS,STANFORD,CA 94305, USA. NR 14 TC 6 Z9 6 U1 1 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1134 EP 1141 DI 10.1117/12.55912 PG 8 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200013 ER PT J AU ULMER, MP HAIDLE, R ALTKORN, R GEORGOPOULOS, P RODRICKS, B TAKACS, PZ AF ULMER, MP HAIDLE, R ALTKORN, R GEORGOPOULOS, P RODRICKS, B TAKACS, PZ TI FABRICATION AND CHARACTERIZATION OF REPLICATED AND LACQUER-COATED GRAZING-INCIDENCE OPTICS FOR X-RAY ASTRONOMY SO OPTICAL ENGINEERING LA English DT Article DE X-RAY EUV OPTICS; GRAZING-INCIDENCE OPTICS; WOLTER-I MIRRORS; LACQUER-COATED OPTICS; ELECTROFORMED OPTICS ID MIRRORS AB We discuss the fabrication and testing of electroformed replica Wolter I optics made from gold-coated lacquered mandrels. We also discuss testing of gold- and palladium-coated lacquered test flats. X-ray (5 keV for Wolter I mirror and 8 to 40 keV for test flats) and optical (Wyko NCP-1000 profiler) measurements were used to evaluate the mirrors. C1 NORTHWESTERN UNIV,BASIC IND RES LAB,EVANSTON,IL 60208. NORTHWESTERN UNIV,DEPT MAT SCI,EVANSTON,IL 60208. ARGONNE NATL LAB,ADV PHOTON SOURCE,ARGONNE,IL 60439. BRIGHAM YOUNG UNIV,DIV INSTRUMENTAT,PROVO,UT 84601. RP ULMER, MP (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1150 EP 1154 DI 10.1117/12.55918 PG 5 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200015 ER PT J AU MILLS, DM AF MILLS, DM TI TECHNIQUES OF PRODUCTION AND ANALYSIS OF POLARIZED X-RAY SYNCHROTRON RADIATION SO OPTICAL ENGINEERING LA English DT Article DE X-RAY EUV OPTICS; X-RAY POLARIZATION ANALYSIS; X-RAY POLARIMETRY; X-RAY PHASE PLATES ID GENERATION; SCATTERING AB The use of the unique polarization properties of synchrotron radiation in the hard x-ray spectral region (E > 3 keV) is becoming increasingly important to many synchrotron radiation researchers. The radiation emitted from bending magnets and conventional (planar) insertion devices (IDs) is highly linearly polarized in the plane of the particle's orbit. Elliptically polarized x rays can also be obtained by going off axis on a bending magnet source, albeit with considerable loss of flux. The polarization properties of synchrotron radiation can be further tailored to the researcher's specific needs through the use of specialized insertion devices such as helical and crossed undulators and asymmetrical wigglers. Even with the possibility of producing a specific polarization, there is still the need to develop x-ray optical components that can manipulate the polarization for analysis and further modification of the polarization state. A survey of techniques for producing and analyzing both linear and circular polarized x rays will be presented with emphasis on those techniques that rely on single-crystal optical components. RP MILLS, DM (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 25 TC 0 Z9 0 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1155 EP 1160 DI 10.1117/12.55907 PG 6 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200016 ER PT J AU KRAUS, HG AF KRAUS, HG TI FINITE-ELEMENT FOURIER AND ABBE TRANSFORM METHODS FOR GENERALIZATION OF APERTURE FUNCTION AND GEOMETRY IN FRAUNHOFER-DIFFRACTION THEORY SO OPTICAL ENGINEERING LA English DT Article DE FRAUNHOFER DIFFRACTION; MULTIPLE-MIRROR AND SEGMENTED-MIRROR TELESCOPES; SYNTHETIC APERTURE ARRAYS; SECONDARY OBSTRUCTIONS; CURVED SPIDER SUPPORTS; APODIZATION; SCREENS; OFF-AXIS APERTURES ID TRUNCATED GAUSSIAN BEAMS; FRESNEL; OBSCURATIONS; PATTERNS; SYSTEMS AB Methods for calculating Fraunhofer intensity fields resulting from diffraction through one- and two-dimensional apertures are presented. These methods are based on the geometric concept of finite elements and on Fourier and Abbe transforms. The geometry of the two-dimensional diffracting aperture(s) is based on biquadratic isoparametric elements, which are used to define aperture(s) of complex geometry. These elements are also used to build complex amplitude and phase functions across the aperture(s) which may be of continuous or discontinuous form. The transform integrals are accurately and efficiently integrated numerically using Gaussian quadrature. The power of these methods is most evident in two dimensions, where several examples are presented which include secondary obstructions, straight and curved secondary spider supports, multiple-mirror arrays, synthetic aperture arrays, segmented mirrors, apertures covered by screens, apodization, and phase plates. Typically, the finite element Abbe transform method results in significant gains in computational efficiency over the finite element Fourier transform method, but is also subject to some loss in generality. RP KRAUS, HG (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 30 TC 3 Z9 3 U1 0 U2 2 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD AUG PY 1991 VL 30 IS 8 BP 1191 EP 1207 DI 10.1117/12.55900 PG 17 WC Optics SC Optics GA FZ612 UT WOS:A1991FZ61200020 ER PT J AU GOLUB, I GOSNELL, TR TAYLOR, AJ AF GOLUB, I GOSNELL, TR TAYLOR, AJ TI SUPPRESSION OF AMPLIFIED SPONTANEOUS EMISSION IN A SUBPICOSECOND KRF AMPLIFIER LASER SYSTEM USING ACRIDINE DYE SO OPTICS COMMUNICATIONS LA English DT Article ID SATURABLE ABSORBER; NM AB Performance of a two-stage KrF ultrashort-pulse amplifier system using acridine dye as an interstage saturable absorber is studied. Compared to a system employing a spatial filter, the amplified spontaneous emission included within the same solid angle subtended by the output pulse can be reduced by almost an order of magnitude, but at the expense of a 35% reduction in the short-pulse output energy. A criterion is established for the advantageous use of a saturable absorber whose performance is nevertheless degraded by nonsaturable loss. RP GOLUB, I (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LASER & OPT SCI GRP,MS E535,LOS ALAMOS,NM 87545, USA. NR 10 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD AUG 1 PY 1991 VL 84 IS 5-6 BP 299 EP 302 DI 10.1016/0030-4018(91)90091-Q PG 4 WC Optics SC Optics GA GC746 UT WOS:A1991GC74600016 ER PT J AU AUERBACH, JM SCHMITT, RL AF AUERBACH, JM SCHMITT, RL TI DIODE-LASER-PUMPED MONOLITHIC ND-YLF LASER OPERATING AT 1.053-MU-M SO OPTICS LETTERS LA English DT Article ID YAG LASER AB We describe a monolithic diode-laser-pumped Nd:YLF minilaser that operates at 1.053-mu-m. By aligning the c axis of the Nd:YLF crystal parallel to the laser resonator axis we are able to suppress completely lasing on the (higher-gain) 1.047-mu-m transition of Nd:YLF We describe the design and fabrication of the laser and report its cw and gain-switched performance. Our measurements of the laser performance agree well with calculations. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94550. RP AUERBACH, JM (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 16 TC 11 Z9 11 U1 1 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 1 PY 1991 VL 16 IS 15 BP 1171 EP 1173 DI 10.1364/OL.16.001171 PG 3 WC Optics SC Optics GA GA143 UT WOS:A1991GA14300015 PM 19776910 ER PT J AU DICKEY, FM ROMERO, LA AF DICKEY, FM ROMERO, LA TI NORMALIZED CORRELATION FOR PATTERN-RECOGNITION SO OPTICS LETTERS LA English DT Article ID FILTERS AB The normalization of the correlation filter response effects intensity invariance. We discuss the implications of a normalization based on the Cauchy-Schwarz inequality for the discrimination problem. It is shown that normalized phase-only and synthetic discriminant functions do not provide the discrimination/recognition obtained with the classical matched filter. RP DICKEY, FM (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 6 TC 46 Z9 48 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 1 PY 1991 VL 16 IS 15 BP 1186 EP 1188 DI 10.1364/OL.16.001186 PG 3 WC Optics SC Optics GA GA143 UT WOS:A1991GA14300020 PM 19776915 ER PT J AU STRAUSS, CEM FUNK, DJ AF STRAUSS, CEM FUNK, DJ TI BROADLY TUNABLE DIFFERENCE-FREQUENCY-GENERATION OF VUV USING 2-PHOTON RESONANCES IN H2 AND KR SO OPTICS LETTERS LA English DT Article ID STATE; IONIZATION; RADIATION; DYNAMICS; KRYPTON; XENON; H-2 AB We report generation of tunable VUV radiation in the range 117-150 nm by four-wave difference-frequency mixing of a tunable ArF excimer laser with an Nd:YAG-pumped dye laser. The four-wave mixing occurs through two-photon resonant enhancement of chi-(3) through the E,F1-SIGMA-g+ (E,v' = 2, J' = 0-3) state(s) of H-2 or the 4p(5)6p(3/2)2 state of Kr in the process (2-omega-193 - omega-dye = omega-VUV). An estimate of energy efficiency yields 3 x 10(-5) near 133 nm for both H-2 and Kr. Even though several rotational resonances fall within the natural 193-nm bandwidth, mixing with broadband ArF output in H-2 yields single-line VUV output with a FWHM of 3.5 cm-1 at half the efficiency compared with that of line-narrowed operation. RP STRAUSS, CEM (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,PHOTOCHEM & PHOTOPHYS GRP CLS-4,MS J567,LOS ALAMOS,NM 87545, USA. NR 14 TC 15 Z9 15 U1 0 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 1 PY 1991 VL 16 IS 15 BP 1192 EP 1194 DI 10.1364/OL.16.001192 PG 3 WC Optics SC Optics GA GA143 UT WOS:A1991GA14300022 PM 19776917 ER PT J AU BERMAN, SM GREENHOUSE, DS BAILEY, IL CLEAR, RD RAASCH, TW AF BERMAN, SM GREENHOUSE, DS BAILEY, IL CLEAR, RD RAASCH, TW TI HUMAN ELECTRORETINOGRAM RESPONSES TO VIDEO DISPLAYS, FLUORESCENT LIGHTING, AND OTHER HIGH-FREQUENCY SOURCES SO OPTOMETRY AND VISION SCIENCE LA English DT Article DE ELECTRORETINOGRAM; VIDEO DISPLAYS; FLUORESCENT LAMPS FLICKER; AUTOREGRESSION; PHOTOVOLTAIC EFFECT AB Time-averaged human electroretinogram (ERG) responses were determined for several workplace visual stimuli which are temporally modulated at rates exceeding the perceptual critical fusion frequency (CFF). A clearly identifiable synchronous response was in evidence for a video display terminal (VDT) stimulus operating with a refresh rate as high as 76 Hz. A directly viewed fluorescent luminaire with controllable driving frequency elicited a synchronous response at rates as high as 145 Hz. In addition, an intense stimulus created by modulating the light from a slide projector produced responses at least as high as 162 Hz. The implications of these high-frequency responses as representing a potential basis for visual symptoms are discussed. RP BERMAN, SM (reprint author), UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,LIGHTING GRP,MS 46-125,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Raasch, Thomas/A-3588-2013 NR 0 TC 52 Z9 53 U1 1 U2 6 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 1040-5488 J9 OPTOMETRY VISION SCI JI Optom. Vis. Sci. PD AUG PY 1991 VL 68 IS 8 BP 645 EP 662 DI 10.1097/00006324-199108000-00012 PG 18 WC Ophthalmology SC Ophthalmology GA GB123 UT WOS:A1991GB12300012 PM 1923343 ER PT J AU KUBAS, GJ KISS, G HOFF, CD AF KUBAS, GJ KISS, G HOFF, CD TI SOLUTION CALORIMETRIC, EQUILIBRIUM, AND SYNTHETIC STUDIES OF OXIDATIVE ADDITION REDUCTIVE ELIMINATION OF C5R5H (R = H, ME, INDENYL) TO/FROM THE COMPLEXES M(CO)3(RCN)3/(ETA-5-C5R5)M(CO)3H (M = CR, MO, W) SO ORGANOMETALLICS LA English DT Article ID TRANSITION-METAL-COMPLEXES; SUBSTITUTION-REACTIONS; THERMODYNAMIC ACIDITY; THERMOCHEMISTRY; CARBONYLS; EXCHANGE; LIGANDS; ARENES; HEATS; CO AB Equilibrium data are reported for the reaction CpMo(CO)3H + 3MeCN reversible Mo(CO)3(MeCN)3 + CpH. Over the temperature range 43-82-degrees-C, DELTA-H = -11.2 kcal/mol, DELTA-S = -51.3 cal/(mol-degrees-C). Calorimetric data for the enthalpies of displacement of C5R5H by nitriles are reported: Cr, R = Me, -0.7 +/- 0.7 kcal/mol, M = W, R = H, -5.6 +/- 0.7, R = Me, -5.4 +/- 0.7 kcal/mol. The enthalpy of reaction of Na+(indenyl)- with (p-xylene)Mo(CO)3 forming Na+Mo(CO)3(indenyl)- is -17.3 +/- 0.2 kcal/mol, approximately 10 kcal/mol less than the corresponding reaction of Na+C5H5-. The heat of reaction of (indenyl)W(CO)3H with EtCN forming W(CO)3(EtCN)3, -20.0 +/- 0.8 kcal/mol, is approximately 14 kcal/mol more exothermic than the corresponding reaction of the cyclopentadienyl complex, also in keeping with a reduced M-indenyl ground-state bond energy. Synthetic strategies to the (C5R5)M(CO)3H complexes are summarized. C1 UNIV MIAMI,DEPT CHEM,CORAL GABLES,FL 33124. RP KUBAS, GJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 33 TC 53 Z9 53 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD AUG PY 1991 VL 10 IS 8 BP 2870 EP 2876 DI 10.1021/om00054a062 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA GA275 UT WOS:A1991GA27500062 ER PT J AU PAWEL, RE YODER, GL FELDE, DK MONTGOMERY, BH MCFEE, MT AF PAWEL, RE YODER, GL FELDE, DK MONTGOMERY, BH MCFEE, MT TI THE CORROSION OF 6061 ALUMINUM UNDER HEAT-TRANSFER CONDITIONS IN THE ANS CORROSION TEST LOOP SO OXIDATION OF METALS LA English DT Article DE ALUMINUM CORROSION; 6061 ALUMINUM; HEAT-TRANSFER CORROSION; CORROSION IN RESEARCH REACTORS AB The corrosion of aluminum alloy fuel cladding in ultrahigh flux research reactors such as the Advanced Neutron Source may pose special temperature and structural problems associated with the buildup of reaction products during the lifetime of the core. In order to ensure that both the fuel and cladding integrity are maintained for the special conditions to be imposed on the ANS fuel plates, an experimental facility was constructed that permits the examination of material behavior for a wide range of thermal-hydraulic conditions, particularly high heat flux (to 20 MW/m2) and coolant velocity (to 35m/sec). Tests have been conducted on specimens of 6061 aluminum that yielded meaningful comparisons to earlier data (i.e., High Flux Isotope Reactor and Advanced Test Reactor) and illustrated several important aspects of the process. In addition to the direct measurements of temperature response, these tests indicated that the film growth rate and morphology were sensitive to the heat flux and coolant water chemistry, as well as other system temperatures. The corrosion products were mainly boehmite (Al2O3.H2O) and an iron-rich barrier-type layer on the outer surface of the boehmite, which appeared to form in certain instances as a consequence of mass transport from the cooler sections of the loop. Eventually, also depending upon the particular coolant and heat-transfer conditions, the films underwent spallation; and this event was followed by an aggressive internal reaction in the alloy underlying the film. RP PAWEL, RE (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 13 TC 7 Z9 7 U1 0 U2 2 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 AUG PY 1991 VL 36 IS 1-2 BP 175 EP 194 DI 10.1007/BF00938461 PG 20 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA FY235 UT WOS:A1991FY23500009 ER PT J AU COPPENGER, GD CROCKER, BR WHEELER, DE AF COPPENGER, GD CROCKER, BR WHEELER, DE TI OZONE TREATMENT OF COOLING WATER - RESULTS OF A FULL-SCALE PERFORMANCE EVALUATION SO OZONE-SCIENCE & ENGINEERING LA English DT Article DE OZONE; COOLING WATER TREATMENT; COOLING TOWER WATER TREATMENT; AIR CONDITIONING COOLING TOWERS; MICROBIOLOGICAL CONTROL; CORROSION CONTROL; CRITICAL SCALING TEMPERATURE AB This paper is the first technical status report of a continuing evaluation of ozone treatment for cooling tower water. Data will be presented that illustrate the results of ozone treatment in a 3,400-ton air-conditioning cooling system at the Oak Ridge Y-12 Plant, Oak Ridge, Tennessee, which is operated by Martin Marietta Energy Systems, Inc., for the U.S. Department of Energy.1 Heat transfer data and equipment inspections confirm that a threshold surface temperature exists, below which heat exchange surfaces remain free of mineral scale. Heat exchange surfaces that exceed the temperature threshold experience calcium carbonate scaling. The temperature threshold effect may explain why ozone treatment has been reported as a successful treatment for air conditioning cooling towers, but has not been successful in higher temperature process cooling systems. Plans for future ozone investigations will be discussed. C1 TENERA LP,KNOXVILLE,TN. ENVIRONM SYST CORP,KNOXVILLE,TN. RP COPPENGER, GD (reprint author), MARTIN MARIETTA ENERGY SYST INC,OAK RIDGE Y-12 PLANT,OAK RIDGE,TN 37831, USA. NR 15 TC 1 Z9 1 U1 0 U2 1 PU CRC PRESS INC PI BOCA RATON PA 2000 CORPORATE BLVD NW, BOCA RATON, FL 33431 SN 0191-9512 J9 OZONE-SCI ENG JI Ozone-Sci. Eng. PD AUG PY 1991 VL 13 IS 4 BP 375 EP 396 DI 10.1080/01919519108552278 PG 22 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA GD492 UT WOS:A1991GD49200001 ER PT J AU PEAK, JG PILAS, B DUDEK, EJ PEAK, MJ AF PEAK, JG PILAS, B DUDEK, EJ PEAK, MJ TI DNA BREAKS CAUSED BY MONOCHROMATIC 365-NM ULTRAVIOLET-A RADIATION OR HYDROGEN-PEROXIDE AND THEIR REPAIR IN HUMAN EPITHELIOID AND XERODERMA-PIGMENTOSUM CELLS SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID SINGLE-STRAND BREAKS; UVA 334 NM; ACTION SPECTRUM; HUMAN-FIBROBLASTS; ALKALINE ELUTION; ESCHERICHIA-COLI; MAMMALIAN-CELLS; DAMAGE; INDUCTION; INACTIVATION AB The induction and repair of DNA single-strand breaks (SSB) assayed by alkaline filter elution was compared in human epithelioid P3 and xeroderma pigmentosum (XP) cells exposed to monochromatic 365-nm UV-A radiation and H2O2. Initial yields of SSB were measured with the cells held at 0.5-degrees-C during exposure. The yield from exposure to 365-nm radiation was slightly greater in XP than in P3 cells, whereas H2O2 produced more than three times as many SSB in P3 compared with XP cells. o-Phenanthroline (50 mM) markedly inhibited the yields of SSB induced in XP cells by H2O2, but had no effect on those produced by 365-nm UV-A. These results are consistent with the fact that P3 cells, unlike XP cells, have undetectable levels of catalase. The measured production of trace amounts of H2O2 by the actual 365-nm UV-A exposures was not sufficient to account for the numbers of breaks that were observed. Single-strand breaks produced by both agents were completely repaired after 50 min in P3 cells, as were H2O2-induced SSB in XP cells. However, 25% of the 365-nm UV-A-induced SSB in XP cells remained refractory to repair after 60 min. The results show that SSB produced by these two agents are different and that 365 nm radiation produces most SSB in cells by mechanisms other than by production of H2O2. C1 ARGONNE NATL LAB,DIV BIOL & MED RES,MOLEC PHOTOBIOL GRP,ARGONNE,IL 60439. IIT,DEPT BIOL,CHICAGO,IL 60613. FU NCI NIH HHS [R01-CA37848, R01-CA34492] NR 38 TC 32 Z9 37 U1 0 U2 1 PU AMER SOC PHOTOBIOLOGY PI AUGUSTA PA BIOTECH PARK, 1021 15TH ST, SUITE 9, AUGUSTA, GA 30901-3158 SN 0031-8655 J9 PHOTOCHEM PHOTOBIOL JI Photochem. Photobiol. PD AUG PY 1991 VL 54 IS 2 BP 197 EP 203 DI 10.1111/j.1751-1097.1991.tb02007.x PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FZ590 UT WOS:A1991FZ59000007 PM 1780357 ER PT J AU GARAB, G KIELECZAWA, J SUTHERLAND, JC BUSTAMANTE, C HIND, G AF GARAB, G KIELECZAWA, J SUTHERLAND, JC BUSTAMANTE, C HIND, G TI ORGANIZATION OF PIGMENT PROTEIN COMPLEXES INTO MACRODOMAINS IN THE THYLAKOID MEMBRANES OF WILD-TYPE AND CHLOROPHYLL-B-LESS MUTANT OF BARLEY AS REVEALED BY CIRCULAR-DICHROISM SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID LIGHT-HARVESTING COMPLEX; INTENSITY DIFFERENTIAL SCATTERING; EXCITATION-ENERGY TRANSFER; PHOTOSYSTEM-II; PHOTOSYNTHETIC MEMBRANES; CHLOROPLAST MEMBRANES; SURFACE-CHARGES; HIGHER-PLANTS; PICOSECOND; STACKING AB The organization of pigment-protein complexes into large chiral macrodomains was investigated in wild-type and chlorophyll b-less mutant thylakoid membranes of barley. The variations in the anomalous circular dichroism bands and in the angular-dependence of circular intensity differential scattering showed that in wild-type chloroplasts, the formation of macrodomains was governed by interactions of the light-harvesting chlorophyll a/b complexes (LHCII). Two external factors could be identified which regulate the parameters of the anomalous circular dichroism signal: (i) electrostatic screening by divalent cations under conditions that favor membrane stacking and (ii) the osmotic pressure of the medium, which is suggested to affect the lateral interactions between complexes and influence the packing-density of particles. These two factors governed preferentially the negative and the positive anomalous circular dichroism signals, respectively. In the chlorina f-2 mutant thylakoid membranes, deficient in most chlorophyll b binding proteins, the formation of macrodomains which gave rise to the anomalous circular dichroism signals was still regulated by these same external factors. However, in the absence of major LHCII polypeptides the formation of macrodomains was apparently mediated by other complexes having weaker interaction capabilities. As a consequence, the size of the macrodomains under comparable conditions appeared smaller in the mutant than in the wild-type thylakoid membranes. Circular dichroism is a valuable probe for examining the long-range interactions between pigment-protein complexes which participate in the formation and stabilization of membrane ultrastructure. A functional role of macrodomains in long-range energy migration processes is proposed. C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. HUNGARIAN ACAD SCI,BIOL RES CTR,INST PLANT PHYSIOL,H-6701 SZEGED,HUNGARY. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. NR 57 TC 88 Z9 89 U1 1 U2 10 PU AMER SOC PHOTOBIOLOGY PI AUGUSTA PA BIOTECH PARK, 1021 15TH ST, SUITE 9, AUGUSTA, GA 30901-3158 SN 0031-8655 J9 PHOTOCHEM PHOTOBIOL JI Photochem. Photobiol. PD AUG PY 1991 VL 54 IS 2 BP 273 EP 281 DI 10.1111/j.1751-1097.1991.tb02016.x PG 9 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FZ590 UT WOS:A1991FZ59000016 ER PT J AU KARIM, A ARENDT, BH GOYETTE, R HUANG, YY KLEB, R FELCHER, GP AF KARIM, A ARENDT, BH GOYETTE, R HUANG, YY KLEB, R FELCHER, GP TI AN AUTOMATED NEUTRON REFLECTOMETER (POSY-II) AT THE INTENSE PULSED NEUTRON SOURCE SO PHYSICA B LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODS OF ANALYSIS AND INTERPRETATION OF NEUTRON REFLECTIVITY DATA CY AUG 23-25, 1990 CL ARGONNE, IL SP US DOE, OFF BASIC ENERGY SCI, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UNIV CHICAGO ID REFLECTION AB A brief description is given of the time-of-flight neutron relfectometer POSY II at the Intense Pulsed Neutron Source (IPNS) at Argonne National Laboratory. Both data collection and refinement of the experimental data are nearly automatic. The neutron reflectivity is measured as a function of the neutron momentum perpendicular to the surface over a range from 0 to 0.1 angstrom-1. The instrument is capable of measuring reflectivities as low as 10(-6). The neutron reflectivity is used to determine the composition profile of the layers close to the surface of the sample, with a depth resolution of approximately 10 angstrom. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 10 TC 26 Z9 26 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP 17 EP 24 DI 10.1016/0921-4526(91)90030-I PG 8 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500004 ER PT J AU SINHA, SK AF SINHA, SK TI REFLECTIVITY USING NEUTRONS OR X-RAYS - A CRITICAL COMPARISON SO PHYSICA B LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODS OF ANALYSIS AND INTERPRETATION OF NEUTRON REFLECTIVITY DATA CY AUG 23-25, 1990 CL ARGONNE, IL SP US DOE, OFF BASIC ENERGY SCI, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UNIV CHICAGO ID VAPOR INTERFACE; SCATTERING; SURFACE; DIFFRACTION; FILMS AB The relative advantages and disadvantages of neutrons and X-rays for reflectivity studies are discussed in terms of intensities, resolutions, backgrounds and selectivities. The general but important question of how to separate the true specular reflectivity from the diffuse background is addressed. Finally, certain special cases of diffuse scattering, such as scattering from liquid surfaces and from multiple interfaces with correlated roughness, are discussed in detail. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 27 TC 102 Z9 102 U1 3 U2 12 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP 25 EP 34 DI 10.1016/0921-4526(91)90031-9 PG 10 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500005 ER PT J AU ZHAO, W ZHAO, X RAFAILOVICH, MH SOKOLOV, J MANSFIELD, T STEIN, RS COMPOSTO, RC KRAMER, EJ JONES, RAL SANSONE, M NELSON, M AF ZHAO, W ZHAO, X RAFAILOVICH, MH SOKOLOV, J MANSFIELD, T STEIN, RS COMPOSTO, RC KRAMER, EJ JONES, RAL SANSONE, M NELSON, M TI NEUTRON AND X-RAY REFLECTIVITY MEASUREMENTS OF POLYSTYRENE POLYBROMOSTYRENE (PS PBRS) INTERFACES SO PHYSICA B LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODS OF ANALYSIS AND INTERPRETATION OF NEUTRON REFLECTIVITY DATA CY AUG 23-25, 1990 CL ARGONNE, IL SP US DOE, OFF BASIC ENERGY SCI, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UNIV CHICAGO ID POLYMER-POLYMER INTERFACES; MOLECULAR-WEIGHT; COPOLYMERS; MIXTURES; BLENDS AB Comparative X-ray and neutron reflectivity (XR and NR) measurements were made to study interface formation in the highly immiscible polymer pair deuterated polystyrene/polybromostyrene (PS/PBrS). Since deuterium provides the scattering contrast for NR while electronic density differences give XR contrast, the experiments constitute independent high-resolution measurements of the same interface. For the (PBrS) (670K)/dPS(730K) interface we find the interfacial width, 39 +/- 5 angstrom by XR and 41 +/- 5 angstrom by NR to be in satisfactory agreement. C1 UNIV MASSACHUSETTS,AMHERST,MA 01033. UNIV PENN,PHILADELPHIA,PA 19104. CORNELL UNIV,ITHACA,NY 14853. UNIV CAMBRIDGE,CAMBRIDGE CB3 OHE,ENGLAND. EXXON RES & ENGN CO,ANNANDALE,NJ 08801. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP ZHAO, W (reprint author), CUNY QUEENS COLL,FLUSHING,NY 11367, USA. OI Jones, Richard/0000-0001-5400-6369 NR 13 TC 26 Z9 26 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP 43 EP 46 DI 10.1016/0921-4526(91)90033-B PG 4 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500007 ER PT J AU HAMILTON, WA PYNN, R AF HAMILTON, WA PYNN, R TI THE EFFECT OF SURFACE-ROUGHNESS ON THE PHASE OF NEUTRONS SPECULARLY REFLECTED AT GRAZING-INCIDENCE SO PHYSICA B LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODS OF ANALYSIS AND INTERPRETATION OF NEUTRON REFLECTIVITY DATA CY AUG 23-25, 1990 CL ARGONNE, IL SP US DOE, OFF BASIC ENERGY SCI, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UNIV CHICAGO AB The effect of surface roughness on the specular intensity of a reflected neutron beam can be calculated using the distorted wave Born approximation (DWBA). For Gaussian roughness the result obtained is the familiar expression of Nevot and Croce. When the distribution of surface heights, z, is proportional to cosh-2(z/2d), the reflectance calculated from the DWBA is sinh[pi-d(k1-k2)]/sinh[pi-d(k1 + k2)]. Here k1 and k2 are the components of neutron wave vectors perpendicular to the interface, evaluated outside and inside the reflecting medium, and d is a measure of the amplitude of the interfacial roughness. This result for the reflectance differs by a phase factor from that obtained in an exact calculation for an interface with the corresponding graded refractive index. The phase difference between the two expressions is small, scaling as approximately d3, and usually has little effect on measured reflectivities of multilayered structures. Ways in which the phase could be determined are discussed. RP HAMILTON, WA (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87544, USA. NR 4 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP 71 EP 73 DI 10.1016/0921-4526(91)90036-E PG 3 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500010 ER PT J AU ROBERTS, TM AF ROBERTS, TM TI INTRODUCTION TO SCHRODINGER INVERSE SCATTERING SO PHYSICA B LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODS OF ANALYSIS AND INTERPRETATION OF NEUTRON REFLECTIVITY DATA CY AUG 23-25, 1990 CL ARGONNE, IL SP US DOE, OFF BASIC ENERGY SCI, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UNIV CHICAGO ID STEP-PERIODIC POTENTIALS; ONE DIMENSION; LOCAL IMPURITY; OPERATOR AB Schrodinger inverse scattering uses scattering coefficients and bound state data to compute underlying potentials. Inverse scattering has been studied extensively for isolated potentials q(x), which tend to zero as \x\ --> infinity. Inverse scattering for isolated impurities in backgrounds p(x) that are periodic, are Heaviside steps, are constant for x > 0 and periodic for x < 0, or that tend to zero as x --> infinity and tend to infinity as x --> - infinity, have also been studied. This paper identifies literature for the five inverse problems just mentioned, and for four other inverse problems. Heaviside-step backgrounds are discussed at length. RP ROBERTS, TM (reprint author), US DOE,AMES LAB,AMES,IA 50011, 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 0921-4526 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP 157 EP 165 DI 10.1016/0921-4526(91)90045-G PG 9 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500019 ER PT J AU ZHOU, XL FELCHER, GP CHEN, SH AF ZHOU, XL FELCHER, GP CHEN, SH TI CLOSED-FORM EXPRESSIONS FOR NEUTRON AND X-RAY REFLECTION AND TRANSMISSION COEFFICIENTS OF A ONE-DIMENSIONAL PROFILE SO PHYSICA B LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODS OF ANALYSIS AND INTERPRETATION OF NEUTRON REFLECTIVITY DATA CY AUG 23-25, 1990 CL ARGONNE, IL SP US DOE, OFF BASIC ENERGY SCI, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UNIV CHICAGO ID REFLECTOMETER; MONOLAYERS; INTERFACE AB As the first part of an effort to systematically study the inversion problem in X-ray and neutron reflectivity experiments, closed-form expressions are derived for the reflection and transmission coefficients as functionals of the sample profile. The assumption used is that the reflection is mainly due to the first and the second order derivatives of the profile and thus the third and higher order derivatives are negligible. One of the two major characteristics of the formulas is that the reflection and transmission coefficients are explicitly expressed in terms of the profile; the other is that the formulas are valid over the entire range of momentum transfer Q. This procedure allows the straightforward calculation of the real space profile using the reflectivity data as the computer input, with an accuracy that still remains to be evaluated through both analytical and numerical analyses with the aid of model profiles. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. MIT,DEPT NUCL ENGN,CAMBRIDGE,MA 02139. RP ZHOU, XL (reprint author), ARGONNE NATL LAB,DIV IPNS,ARGONNE,IL 60439, USA. NR 13 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP 167 EP 179 DI 10.1016/0921-4526(91)90046-H PG 13 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500020 ER PT J AU YUN, WB VICCARO, PJ AF YUN, WB VICCARO, PJ TI SPATIAL-RESOLUTION IN DEPTH-CONTROLLED SURFACE SENSITIVE X-RAY TECHNIQUES SO PHYSICA B LA English DT Article; Proceedings Paper CT WORKSHOP ON METHODS OF ANALYSIS AND INTERPRETATION OF NEUTRON REFLECTIVITY DATA CY AUG 23-25, 1990 CL ARGONNE, IL SP US DOE, OFF BASIC ENERGY SCI, ARGONNE NATL LAB, DIV EDUC PROGRAMS, UNIV CHICAGO ID LIQUID-VAPOR INTERFACE; TOTAL EXTERNAL FLUORESCENCE; DIFFRACTION; MONOLAYERS; PROFILE AB The spatial resolution along the surface normal and the total depth probed are two important parameters in depth-controlled surface sensitive X-ray techniques employing grazing incidence geometry. The two parameters are analyzed in terms of optical properties (refractive indices) of the media involved and parameters of the incident X-ray beam: beam divergence, X-ray energy, and spectral bandwidth. We derive analytical expressions of the required beam divergence and spectral bandwidth of the incident beam as a function of the two parameters. Sample calculations are made for X-ray energies between 0.1 and 100 keV and for solid Be, Cu and Au, representing material matrices consisting of low, medium and high atomic number elements. A brief discussion on obtaining the required beam divergence and spectral bandwidth from present X-ray sources and optics is given. RP YUN, WB (reprint author), ARGONNE NATL LAB,ADV PHOTON SOURCE,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP 199 EP 205 DI 10.1016/0921-4526(91)90049-K PG 7 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500023 ER PT J AU FLECHER, GP RUSSELL, TP AF FLECHER, GP RUSSELL, TP TI PROCEEDINGS OF THE WORKSHOP ON METHODS OF ANALYSIS AND INTERPRETATION OF NEUTRON REFLECTIVITY DATA - ARGONNE, ILLINOIS, 23-25 AUGUST 1990 - FOREWORD SO PHYSICA B LA English DT Editorial Material C1 IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95114. RP FLECHER, GP (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP R7 EP R8 PG 2 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500001 ER PT J AU SIVIA, DS HAMILTON, WA SMITH, GS AF SIVIA, DS HAMILTON, WA SMITH, GS TI ANALYSIS OF NEUTRON REFLECTIVITY DATA - MAXIMUM-ENTROPY, BAYESIAN SPECTRAL-ANALYSIS AND SPECKLE HOLOGRAPHY SO PHYSICA B-CONDENSED MATTER LA English DT Article ID RECONSTRUCTION AB The analysis of neutron reflectivity data to obtain nuclear scattering length density profiles is akin to the notorious phaseless Fourier problem, well known in many fields such as crystallography. Current methods of analysis culminate in the refinement of a few parameters of a functional model, and are often preceded by a long and laborious process of trial and error. We start by discussing the use of maximum entropy for obtaining "free-form" solutions of the density profile, as an alternative to the trial and error phase when a functional model is not available. Next we consider a Bayesian spectral analysis approach, which is appropriate for optimising the parameters of a simple (but adequate) type of model when the number of parameters is not known. Finally, we suggest a novel experimental procedure, the analogue of astronomical speckle holography, designed to alleviate the ambiguity problems inherent in traditional reflectivity measurements. C1 UNIV CALIF LOS ALAMOS SCI LAB, MANUEL LUJAN JR NEUTRON SCATTERING CTR, LOS ALAMOS, NM 87545 USA. RP UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. NR 21 TC 70 Z9 70 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD AUG PY 1991 VL 173 IS 1-2 BP 121 EP 138 DI 10.1016/0921-4526(91)90042-D PG 18 WC Physics, Condensed Matter SC Physics GA GD895 UT WOS:A1991GD89500016 ER PT J AU BIVINS, RL LOUCK, JD METROPOLIS, N STEIN, ML AF BIVINS, RL LOUCK, JD METROPOLIS, N STEIN, ML TI CLASSIFICATION OF ALL CYCLES OF THE PARABOLIC MAP SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES AB The problem of determining all cycles of the parabolic map p-zeta-(x) for all parameter values zeta is-an-element-of (0, infinity) and all x is-an-element-of (0, infinity) is addressed. The method is one of decomposing the set of all fixed points of the nth iterate p-zeta-n(x), for arbitrary n, into cycles of p-zeta-(x). Toward this goal, the inverse graph of p-zeta-n(x) is constructed for all zeta and its complete description given in terms of sequences alpha = (alpha-0, alpha-1, alpha-2, ...), each alpha-i a nonnegative integer, and their negatives, and a total order relation on all such sequences. It is shown how the properties of these sequences give a complete description of the evolution of the graph in the parameter zeta with respect to changes in its shape and in its bifurcation structure. These results are then used to infer properties of the decomposition of the set of fixed points of p-zeta-n into cycles of p-zeta. RP BIVINS, RL (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. NR 10 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 3 EP 27 DI 10.1016/0167-2789(91)90218-X PG 25 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900002 ER PT J AU HOLM, DD KOVACIC, G AF HOLM, DD KOVACIC, G TI HOMOCLINIC CHAOS FOR RAY OPTICS IN A FIBER SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES ID TRANSPORT AB In the geometrical optics approximation, stable and unstable manifolds of periodic orbits, invariant tori, and hyperbolic invariant manifolds are shown to exist and produce trapping of bundles of light rays near the axis of a translation-invariant, axisymmetric optical fiber whose squared refractive index is a parabolic function of squared radius. Periodic symmetry-breaking perturbations in the refractive index are shown to destroy this ray trapping and to produce homoclinic tangles, through which nearby trapped rays may escape, and untrapped rays may become at least temporarily trapped. Melnikov's technique is used to prove that the perturbations cause the stable and unstable manifolds of the unperturbed periodic orbits, invariant tori, and hyperbolic invariant manifolds to develop transverse intersections and therefore, to form homoclinic tangles. These tangles imply either homoclinic chaos by the Smale horseshoe mechanism and the Poincare-Birkhoff-Smale theorem, or Arnol'd diffusion. In both situations, lobe dynamics will dominate phase space transport, seen here as a flux of (initially) untrapped rays passing through the trapping region. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP HOLM, DD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Holm, Darryl D/0000-0001-6362-9912 NR 14 TC 9 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 177 EP 188 DI 10.1016/0167-2789(91)90230-7 PG 12 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900014 ER PT J AU HOLM, DD WOLF, KB AF HOLM, DD WOLF, KB TI LIE-POISSON DESCRIPTION OF HAMILTONIAN RAY OPTICS SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES AB We express classical Hamiltonian ray optics for light rays in axisymmetric fibers as a Lie-Poisson dynamical system defined in R3, regarded as the dual of the Lie algebra sp(2,R). The ray-tracing dynamics is interpreted geometrically as motion in R3 along the intersections of two-dimensional level surfaces of the conserved optical Hamiltonian and the skewness invariant (the analog of angular momentum, conserved because of the axisymmetry of the medium). In this geometrical picture, a Hamiltonian level surface is a vertically oriented cylinder whose cross section describes the radial profile of the refractive index, and a level surface of the skewness function is a hyperboloid of revolution around a horizontal axis. Points of tangency of these surfaces are equilibria, which are stable when the Gaussian curvature of the Hamiltonian level surface (constrained by the skewness function) is negative definite at the equilibrium point. Examples are discussed for various radial profiles of the refractive index. This discussion places optical ray tracing in fibers into the geometrical setting of Lie-Poisson Hamiltonian dynamics and provides an example of optical ray trapping within separatrices (homoclinic orbits). C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV NACL AUTONOMA MEXICO,INST INVEST MATEMAT APLICADAS & SIST,MEXICO CITY 01000,DF,MEXICO. RP HOLM, DD (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. OI Holm, Darryl D/0000-0001-6362-9912 NR 7 TC 13 Z9 13 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 189 EP 199 DI 10.1016/0167-2789(91)90231-W PG 11 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900015 ER PT J AU KOVACIC, G AF KOVACIC, G TI LOBE AREA VIA ACTION FORMALISM IN A CLASS OF HAMILTONIAN-SYSTEMS SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES ID ASYMPTOTIC STABILITY; TRANSPORT AB We compute the first term in a direct asymptotic expansion of the exact lobe area formula in a large class of weakly forced one-degree-of-freedom Hamiltonian systems. We devise a new homotopy method to serve as the main tool in our calculation. Our final result agrees with the usual Melnikov function formula. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP KOVACIC, G (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 13 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 226 EP 233 DI 10.1016/0167-2789(91)90235-2 PG 8 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900019 ER PT J AU CAMASSA, R WU, TYT AF CAMASSA, R WU, TYT TI STABILITY OF SOME STATIONARY SOLUTIONS FOR THE FORCED KDV EQUATION SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES ID MOVING DISTURBANCES; SOLITARY WAVES; GENERATION; FLOW AB The forced KdV (fKdV) equation has been established by recent studies as a simple mathematical model capable of describing the physics of a shallow layer of fluid in response to external forcing. For a particular one-parameter family of forcings characterized by a wave amplitude parameter for a certain supercritical forcing distribution, the exact stationary solutions are known. We study the stability of these solutions as the parameter varies. The linear stability analysis is first carried out by exploring the structure of the spectrum of the associated eigenvalue problem using a perturbation technique applied to a neighbourhood of isolated parameter values, where eigenfunctions corresponding to eigenvalue zero can be expressed in closed form. The results identify a set of intervals in the parameter space corresponding to different types of manifestation of instability. In the region of the parameter space where the linear stability analysis fails to provide an answer, we discuss a nonlinear analysis that provides a sufficient condition for stability. C1 CALTECH,DIV ENGN & APPL SCI,PASADENA,CA 91125. RP CAMASSA, R (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 13 TC 21 Z9 22 U1 2 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 295 EP 307 DI 10.1016/0167-2789(91)90240-A PG 13 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900024 ER PT J AU DAVID, D TRATNIK, MV AF DAVID, D TRATNIK, MV TI POLARIZATION MODULATED SOLITARY WAVES IN AN OPTICAL FIBER SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES ID LINEAR SCHRODINGER-EQUATIONS; CROSS-PHASE MODULATION; INTEGRABILITY; SOLITONS AB A family of solitary waves is found which satisfy the coupled nonlinear Schrodinger equations governing optical pulse propagation in an elliptical core optical fiber. These are polarization modulated pulses which are bound states of two solitions which when decoupled have constant and uniform orthogonal linear polarizations. The formation of these bound states is possible only above a minimum energy threshold determined by the ellipticity of the fiber. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. SO METHODIST UNIV,DEPT MATH,DALLAS,TX 75275. RP DAVID, D (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545, 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 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 308 EP 315 DI 10.1016/0167-2789(91)90241-Z PG 8 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900025 ER PT J AU CAMASSA, R WIGGINS, S AF CAMASSA, R WIGGINS, S TI TRANSPORT OF A PASSIVE TRACER IN TIME-DEPENDENT RAYLEIGH-BENARD CONVECTION SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES AB The transport of a passive tracer in a Rayleigh-Benard cell is considered, when the convection rolls are subject to oscillatory instability. We propose a mechanism for the roll to roll transport and introduce formulae for quantifying the spreading of the tracer, which are valid for as long as the molecular diffusivity can be neglected. A criterion for weighing the effects of diffusivity is discussed, and we provide an example by numerically simulating the flow in presence of molecular diffusivity. C1 UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. CALTECH,PASADENA,CA 91125. RP CAMASSA, R (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 8 TC 6 Z9 6 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 472 EP 481 DI 10.1016/0167-2789(91)90253-6 PG 10 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900037 ER PT J AU KIMURA, Y AF KIMURA, Y TI VORTEX COLLAPSE FROM THE VIEWPOINT OF COMPLEX-TIME SINGULARITY SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES ID POINT VORTICES; MOTION; FLOWS AB Under certain initial and parametric conditions, point vortices will collide, and we can locate a singularity on the real time axis. If some of the conditions deviate from the collapse conditions, the singularity splits into one or more complex-conjugate pairs. Recently, we proposed a scaling law between the deviation of an initial condition from the collapse condition and the resulting shift in the position of the singularity away from the real axis for a system of point vortices. We verify this scaling law for collisions of three and four point vortices. RP KIMURA, Y (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,MS-B258,LOS ALAMOS,NM 87545, USA. NR 18 TC 3 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 512 EP 519 DI 10.1016/0167-2789(91)90257-A PG 8 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900041 ER PT J AU FANG, Z ECKE, R STEINBERG, V AF FANG, Z ECKE, R STEINBERG, V TI ROTATING RAYLEIGH-BENARD CONVECTION - KUPPERS-LORTZ TRANSITION SO PHYSICA D LA English DT Article; Proceedings Paper CT 10TH ANNUAL INTERNATIONAL CONF OF THE CENTER FOR NONLINEAR STUDIES - NONLINEAR SCIENCE : THE NEXT DECADE CY MAY 21-25, 1990 CL LOS ALAMOS, NM SP CTR NONLINEAR STUDIES ID WAVE-VECTOR FIELD; PRANDTL NUMBER; TURBULENCE; PATTERNS; ROLLS; LAYER AB Rayleigh-Benard convection with rotation about a vertical axis is investigated for small dimensionless rotation rates 0 < OMEGA < 50. The convection cell is cylindrical with aspect ratio GAMMA = 10 and the convecting fluid is water with a Prandtl number of 6.8 at T = 23.8-degrees-C. Comparisons are made between experimental data and linear stability theory for the onset Rayleigh number and for the wavenumber dependence of the convective pattern. The nonlinear Kuppers-Lortz transition is found to occur significantly below the theoretically expected rotation rate OMEGA-c and to be nucleated by defects created at the lateral cell walls. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. RP FANG, Z (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,DIV PHYS,LOS ALAMOS,NM 87545, USA. RI Steinberg, Victor/B-3205-2009; OI Ecke, Robert/0000-0001-7772-5876 NR 25 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 596 EP 607 PG 12 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900050 ER PT J AU CAMPBELL, D ECKE, R HYMAN, M AF CAMPBELL, D ECKE, R HYMAN, M TI NONLINEAR SCIENCE - THE NEXT DECADE - PROCEEDINGS OF THE 10TH ANNUAL INTERNATIONAL-CONFERENCE OF THE CENTER-FOR-NONLINEAR-STUDIES LOS-ALAMOS, NM87545, USA, 21-25 MAY 1990 - PREFACE SO PHYSICA D LA English DT Editorial Material RP CAMPBELL, D (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP R7 EP R7 DI 10.1016/0167-2789(91)90217-W PG 1 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900001 ER PT J AU CASDAGLI, M EUBANK, S FARMER, JD GIBSON, J AF CASDAGLI, M EUBANK, S FARMER, JD GIBSON, J TI STATE-SPACE RECONSTRUCTION IN THE PRESENCE OF NOISE SO PHYSICA D-NONLINEAR PHENOMENA LA English DT Article ID CHAOTIC TIME-SERIES; STRANGE ATTRACTORS; DIMENSION; INFORMATION; EQUATIONS; SYSTEMS AB Takens' theorem demonstrates that in the absence of noise a multidimensional state space can be reconstructed from a scalar time series. This theorem gives little guidance, however, about practical considerations for reconstructing a good state space. We extend Takens' treatment, applying statistical methods to incorporate the effects of observational noise and estimation error. We define the distortion matrix, which is proportional to the conditional covariance of a state, given a series of noisy measurements, and the noise amplification, which is proportional to root-mean-square time series prediction errors with an ideal model. We derive explicit formulae for these quantities, and we prove that in the low noise limit minimizing the distortion is equivalent to minimizing the noise amplification. We identify several different scaling regimes for distortion and noise amplification, and derive asymptotic scaling laws. When the dimension and Lyapunov exponents are sufficiently large these scaling laws show that, no matter how the state space is reconstructed, there is an explosion in the noise amplification - from a practical point of view determinism is lost, and the time series is effectively a random process. In the low noise, large data limit we show that the technique of local singular value decomposition is an optimal coordinate transformation, in the sense that it achieves the minimum distortion in a state space of the lowest possible dimension. However, in numerical experiments we find that estimation error complicates this issue. For local approximation methods, we analyze the effect of reconstruction on estimation error, derive a scaling law, and suggest an algorithm for reducing estimation errors. C1 UNIV CALIF LOS ALAMOS SCI LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA. SANTA FE INST, SANTA FE, NM 87501 USA. RP UNIV CALIF LOS ALAMOS SCI LAB, DIV THEORET, LOS ALAMOS, NM 87545 USA. RI Eubank, Stephen/D-7497-2011 OI Eubank, Stephen/0000-0002-7177-309X NR 44 TC 288 Z9 292 U1 0 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 EI 1872-8022 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 52 EP 98 DI 10.1016/0167-2789(91)90222-U PG 47 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900006 ER PT J AU AHLERS, G AF AHLERS, G TI EXPERIMENTS WITH PATTERN-FORMING SYSTEMS SO PHYSICA D-NONLINEAR PHENOMENA LA English DT Article ID WAVE-NUMBER SELECTION; TAYLOR-VORTEX FLOW; RAYLEIGH-BENARD CONVECTION; BINARY-FLUID CONVECTION; GINZBURG-LANDAU EQUATION; 2 HORIZONTAL PLATES; LOW PRANDTL NUMBER; THERMAL-CONVECTION; AMPLITUDE EQUATION; HYDRODYNAMIC FLUCTUATIONS AB Six experimental investigations of pattern-formation problems are reviewed. They were chosen so as to illustrate in succession increasingly complex issues involving systems with spatial variation. The first three deal with the influence of noise, or stochastic forces, on non-equilibrium systems. A second set of experiments addresses progressively more complicated deterministic nonlinear issues. The first experiment which is discussed involves the response of a system below its first bifurcation point to external noise. The particular example studied experimentally was electro-convection in a nematic liquid crystal. The noise-induced fluctuations can be understood in terms of a linear theory. The second experiment addresses the question of how stochastic effects manifest themselves in the pattern evolution which will take place when the control parameter of the system is increased above its threshold value. This was investigated for the case of Rayleigh-Benard convection (RBC). It involves a combination of linear and weakly non-linear phenomena. The third topic deals with stochastic effects on a stationary time-periodic process in a pattern-forming system, namely RBC with periodic modulation of the Rayleigh number. The second set of experiments addresses questions for which stochastic effects play a negligible role. This is so when the pattern amplitude is so large and bifurcations are so far away that the perturbations due to noise can be ignored. The first topic in this category is an investigation of the band of stable states that exists above the first bifurcation in Taylor-vortex flow (TVF). The next issue is the selection of particular states out of this band by a spatial variation of the control parameter. It turns out that this selection is determined by the nature of the control-parameter variation, and not by the non-linear state as such. Thus, this experiment failed to provide any evidence for the existence of an extremum principle which might control the pattern-selection process. However, the results could be understood quantitatively in terms of theoretical models involving phase equations, and thus provide a welcome test of this theoretical approach well above the bifurcation where amplitude equations are no longer applicable. The third experiment in this category can be explained in terms of an amplitude equation, but requires complex coefficients. It involves the study of localized states, or pulses, of travelling convection rolls in a binary mixture. These pulses are related to the solitons in dispersive systems, but differ from them because of the dissipation in the hydrodynamic system. The equivalent of these pulses could not exist in a thermodynamic system, where the existence of a free energy would assure the survival of only one phase for a given set of intensive parameter values. C1 UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV CALIF SANTA BARBARA, CTR NONLINEAR SCI, SANTA BARBARA, CA 93106 USA. RP UNIV CALIF LOS ALAMOS SCI LAB, CTR NONLINEAR STUDIES, LOS ALAMOS, NM 87545 USA. NR 126 TC 42 Z9 43 U1 1 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 EI 1872-8022 J9 PHYSICA D JI Physica D PD AUG PY 1991 VL 51 IS 1-3 BP 421 EP 443 DI 10.1016/0167-2789(91)90249-9 PG 23 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GH639 UT WOS:A1991GH63900033 ER PT J AU CHILDS, WJ AF CHILDS, WJ TI M1, E2, AND M3 HYPERFINE-STRUCTURE AND NUCLEAR MOMENT RATIOS FOR EU-151, EU-153 SO PHYSICAL REVIEW A LA English DT Article ID RF DOUBLE-RESONANCE; SPECTROSCOPY AB The atomic-beam laser-rf double-resonance technique has been used to obtain precise values for the hyperfine structure (hfs) splittings in ten 4f(7)5d6s 10D(J) and 8D(J) levels of Eu-151, Eu-153 I. Detailed studies of the second-order hfs to the isotopic ratios of the hfs constants, and reveal surprisingly strong hfs interactions between the two multiplets. The dipole ratios, when compared with the known ratio of the nuclear dipole moments, reveal striking J- and term-dependent hyperfine anomalies. The quadrupole ratios (after corrections for the second-order hfs) are consistent with the atomic ground-state value and self-consistent among the ten levels studied. The precision of the measurements allows evaluation of the ratio of the magnetic octupole hfs interaction constants between the two isotopes. The result, which is taken to be the ratio of the nuclear ground-state magnetic octupole moments-OMEGA, is found to be OMEGA-(Eu-151)/OMEGA-(Eu-153) = 0.87(6). RP CHILDS, WJ (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 23 TC 19 Z9 19 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD AUG 1 PY 1991 VL 44 IS 3 BP 1523 EP 1530 DI 10.1103/PhysRevA.44.1523 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GA169 UT WOS:A1991GA16900019 ER EF