FN Thomson Reuters Web of Science™ VR 1.0 PT J AU JARDIN, SC BELL, MG POMPHREY, N AF JARDIN, SC BELL, MG POMPHREY, N TI TSC SIMULATION OF OHMIC DISCHARGES IN TFTR SO NUCLEAR FUSION LA English DT Article ID TOKAMAKS; TRANSPORT; PLASMA AB The Tokamak Simulation Code (TSC) has been used to model the time dependence of several Ohmic discharges in the TFTR experiment. The semi-empirical thermal conductivity model and the sawtooth model in TSC have been refined so that good agreement between the simulation and the experiment is obtained in the electron and ion temperature profiles and in the current profiles for the entire duration of the discharges. Neoclassical resistivity gives good agreement with the measured surface voltage and the rate of poloidal flux consumption. RP JARDIN, SC (reprint author), PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. RI Jardin, Stephen/E-9392-2010; pomphrey, neil/G-4405-2010 NR 19 TC 65 Z9 82 U1 0 U2 4 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 MAR PY 1993 VL 33 IS 3 BP 371 EP 382 DI 10.1088/0029-5515/33/3/I01 PG 12 WC Physics, Fluids & Plasmas SC Physics GA NH406 UT WOS:A1993NH40600001 ER PT J AU BOIVIN, RL ZWEBEN, SJ WHITE, RB AF BOIVIN, RL ZWEBEN, SJ WHITE, RB TI STUDY OF STOCHASTIC TOROIDAL FIELD RIPPLE LOSSES OF CHARGED FUSION PRODUCTS AT THE MIDPLANE OF TFTR SO NUCLEAR FUSION LA English DT Article ID TRAPPED-PARTICLES; TOKAMAK REACTOR; CONFINEMENT; PLASMAS; IONS; CODE AB Measurements of charged fusion product losses were obtained near the first wall of TFTR, using a movable detector located just below the outer midplane. Experimental results obtained in MHD quiescent discharges showed the presence of two loss mechanisms - one associated with first-orbit losses and the other believed to be toroidal field stochastic ripple diffusion. Numerical calculations, based on the model of Goldston et al. (Phys. Rev. Lett. 47 (1981) 647), were found to be in reasonable agreement with the experimental results. C1 PRINCETON UNIV,PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08544. RP BOIVIN, RL (reprint author), MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139, USA. RI White, Roscoe/D-1773-2013 OI White, Roscoe/0000-0002-4239-2685 NR 34 TC 37 Z9 37 U1 1 U2 7 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 MAR PY 1993 VL 33 IS 3 BP 449 EP 465 DI 10.1088/0029-5515/33/3/I07 PG 17 WC Physics, Fluids & Plasmas SC Physics GA NH406 UT WOS:A1993NH40600007 ER PT J AU CONAWAY, JG WILSON, RD KRIER, DJ MATHEWS, MA BARBER, JW AF CONAWAY, JG WILSON, RD KRIER, DJ MATHEWS, MA BARBER, JW TI ERRORS IN SPECTRAL GAMMA-RAY LOGS RESULTING FROM RADON DAUGHTERS IN BOREHOLES SO NUCLEAR GEOPHYSICS LA English DT Article AB We have observed large, variable errors in uranium estimates based on spectral gamma-ray lop from an air filled borehole. Stripping away the characteristic K, U and Th components of the recorded spectra leaves residual spectra that compare well with a simulated spectrum representative of Rn-222 daughters in the borehole. Differences between these ''radon'' spectra and the simulated spectrum representative of uranium daughters in the rock can be used as an indicator that the log is affected by radon migration. RP CONAWAY, JG (reprint author), LOS ALAMOS NATL LAB,MS-C335,LOS ALAMOS,NM 87545, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0969-8086 J9 NUCL GEOPHYS JI Nucl. Geophys. PD MAR PY 1993 VL 7 IS 1 BP 55 EP 64 PG 10 WC Geochemistry & Geophysics; Nuclear Science & Technology; Mining & Mineral Processing SC Geochemistry & Geophysics; Nuclear Science & Technology; Mining & Mineral Processing GA LA555 UT WOS:A1993LA55500003 ER PT J AU BERTUCCIO, G REHAK, P XI, DM AF BERTUCCIO, G REHAK, P XI, DM TI A NOVEL CHARGE SENSITIVE PREAMPLIFIER WITHOUT THE FEEDBACK RESISTOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY AB A novel charge sensitive preamplifier#1 which has no resistor in parallel with the feedback capacitor is presented. No external device or circuit is required to discharge the feedback capacitor. The detector leakage and signal current flows away through the gate of the input JFET which works with its gate to source junction slightly forward biased. The DC stabilization of the preamplifier is accomplished by an additional feedback loop, which permits to equalize the current flowing through the forward biased gate to source junction and the current coming from the detector. An equivalent noise charge of less than 20 electrons rms has been measured at room temperature by using an input JFET with a transconductance to gate capacitance ratio of 4 mS/5.4 pF. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. INST HIGH ENERGY PHYS,BEIJING,PEOPLES R CHINA. RP BERTUCCIO, G (reprint author), POLITECN MILAN,DIPARTIMENTO ELETTRON & INFORMAZ,PZA LEONARDO DA VINCI 32,I-20133 MILAN,ITALY. NR 6 TC 72 Z9 73 U1 0 U2 3 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 71 EP 76 DI 10.1016/0168-9002(93)90334-E PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200011 ER PT J AU RADEKA, V RESCIA, S MANFREDI, PF RE, V SPEZIALI, V AF RADEKA, V RESCIA, S MANFREDI, PF RE, V SPEZIALI, V TI MONOLITHIC PREAMPLIFIER EMPLOYING EPITAXIAL N-CHANNEL JFETS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY AB This paper reports the results obtained in the research program oriented to the realisation of a monolithic preamplifier for calorimetry applications at high luminosity colliders. The main purpose of the program is to arrive at a monolithic realisation with a performance as close as possible to that of discrete preamplifiers. The junction field-effect transistors employed in discrete preamplifiers have an epitaxial channel and a very heavily doped gate diffused onto it. They present the best noise and radiation tolerance characteristics. The first step in the program implementation was, accordingly, the search for a process able to make the integration of epitaxial-channel JFETs on a monolithic substrate possible. The integration has been accomplished on the basis of a buried-layer approach to device isolation. Individual JFETs and a complete preamplifier employing only n-channel JFETs have been realised. The characterisation of the individual devices has shown that their behaviour in terms of small signal and noise parameters is very close to that of their discrete equivalents. This result, along with the very good noise performance of the preamplifier, seems to point out that the buried layer process has fulfilled the task for which it was developed. C1 UNIV PAVIA,DIPARTIMENTO ELETTRON,I-27100 PAVIA,ITALY. INFN,I-20133 MILAN,ITALY. RP RADEKA, V (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI Rescia, Sergio/D-8604-2011; OI Rescia, Sergio/0000-0003-2411-8903; Re, Valerio/0000-0003-0697-3420 NR 4 TC 17 Z9 16 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 77 EP 81 DI 10.1016/0168-9002(93)90335-F PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200012 ER PT J AU PINOTTI, E BRAUNINGER, H FINDEIS, N GORKE, H HAUFF, D HOLL, P KEMMER, J LECHNER, P LUTZ, G KINK, W MEIDINGER, N METZNER, G PREDEHL, P REPPIN, C STRUDER, L TRUMPER, J VONZANTHIER, C KENDZIORRA, E STAUBERT, R RADEKA, V REHAK, P BERTUCCIO, G GATTI, E LONGONI, A PULLIA, A SAMPIETRO, M AF PINOTTI, E BRAUNINGER, H FINDEIS, N GORKE, H HAUFF, D HOLL, P KEMMER, J LECHNER, P LUTZ, G KINK, W MEIDINGER, N METZNER, G PREDEHL, P REPPIN, C STRUDER, L TRUMPER, J VONZANTHIER, C KENDZIORRA, E STAUBERT, R RADEKA, V REHAK, P BERTUCCIO, G GATTI, E LONGONI, A PULLIA, A SAMPIETRO, M TI THE PN-CCD ON-CHIP ELECTRONICS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY ID READOUT ELECTRONICS; SILICON AB A new pn-CCD with an activa area of 3 x 1 cm2 was recently fabricated for ESA's X-ray Multi Mirror Mission (XMM). The front-end electronics has been integrated on the same chip as the detector, and its noise behaviour was investigated. X-rays from a Fe-55 source have been used for the absolute calibration. The measured electronic Equivalent Noise Charge (ENC) of the on-chip amplifier was 8.8 e- at room temperature and 2.2 e - at the CCD operating temperature of 150 K. The improvements with respect to the last version with noise figures of 4.8 e- (at 150 K) are due to the reduction of the total input capacitance by a factor of 1.6, the improvement of the transistor transconductance by a factor of 2, and the reduction of 1/f noise because of the different p-well implant with a better thermal annealing. C1 MPI HALBLEITERLAB,W-8000 MUNICH 60,GERMANY. UNIV TUBINGEN,INST ASTRON,W-7400 TUBINGEN 1,GERMANY. BROOKHAVEN NATL LAB,UPTON,NY 11973. POLITECN MILAN,I-20133 MILAN,ITALY. RI Sampietro, Marco/A-3732-2016; OI Sampietro, Marco/0000-0003-4825-9612; Pullia, Alberto/0000-0002-6393-747X NR 10 TC 82 Z9 82 U1 2 U2 5 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 85 EP 91 DI 10.1016/0168-9002(93)90337-H PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200014 ER PT J AU EVENSEN, L HANNEBORG, A HAPP, T WUOSMAA, AH BETTS, RR AF EVENSEN, L HANNEBORG, A HAPP, T WUOSMAA, AH BETTS, RR TI A FAST LOW-NOISE SILICON DETECTOR FOR ELECTRON-SPECTROSCOPY UP TO 1 MEV SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY AB A 1 mm thick silicon pad detector has been developed for the Atlas Positron Experiment (APEX) [1,2]. This experiment requires efficient detection of positrons and electrons with energies up to 1 MeV with an energy resolution of better than 10 keV and time resolution of less than 2 ns. To satisfy these requirements, the detectors should be 1 mm thick with low leakage current and be capable of operation at voltages greater than needed for full depletion. To enhance the charge collection time, the detectors should also withstand cooling to liquid nitrogen temperature. These requirements have been satisfied using diodes manufactured on high resistivity silicon in combination with a segmented guard ring structure (multiguard) and a process optimized to reduce the bulk generated leakage current. A room temperature leakage current of 1 nA/cm2 was achieved and an energy resolution of 3.6 keV FWHM was measured with 30 pF input capacitance on a charge sensitive preamplifier. At -130-degrees-C with 90 pF input capacitance an energy resolution of 3.4 keV FWHM and a time resolution of 1.2 ns was measured for 500 keV electrons in coincidence with gamma rays detected in a BaF2 Scintillator detector. Results from the evaluation of different designs and process approaches are discussed. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP EVENSEN, L (reprint author), SENTER IND FORSKNING,POB 124 BLINDERN,N-0314 OSLO 3,NORWAY. NR 6 TC 25 Z9 25 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 136 EP 143 DI 10.1016/0168-9002(93)90343-G PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200020 ER PT J AU SHUTT, T BARNES, PD CUMMINGS, A DASILVA, A ELLMAN, B EMES, J GIRAUDHERAUD, Y HALLER, EE LANGE, AE ROSS, RR SADOULET, B SMITH, G STUBBS, C STOCKWELL, W WANG, N WHITE, S YOUNG, BA YVON, D AF SHUTT, T BARNES, PD CUMMINGS, A DASILVA, A ELLMAN, B EMES, J GIRAUDHERAUD, Y HALLER, EE LANGE, AE ROSS, RR SADOULET, B SMITH, G STUBBS, C STOCKWELL, W WANG, N WHITE, S YOUNG, BA YVON, D TI A CRYOGENIC DETECTOR WITH SIMULTANEOUS PHONON AND IONIZATION MEASUREMENT FOR BACKGROUND REJECTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY AB We report on the performance of a 60 g Ge detector that measures both ionization and phonons at cryogenic (approximately 25 mK) temperatures. This simultaneous measurements is a powerful new tool in experiments where the primary signal is a nuclear recoil (e.g., WIMP dark matter) that must be distinguished from a background of photons or charged particles that produce electron recoils. We have measured nuclear recoils produced by neutrons from a Cf-252 source, and can distinguish them from photons at energies as low as 2 keV in the ionization measurement. An important effect that can limit the efficiency of the background rejection technique is incomplete charge collection. We have tested our detector at ionization drift fields as low as 5 mV/cm and find that the phonon energy measured for each event depends on the amount of charge collected. From this we deduce details about charge trapping mechanisms. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. UNIV BRITISH COLUMBIA,DEPT PHYS,VANCOUVER V6T 1Z1,BC,CANADA. COLL FRANCE,PHYS CORPUSCULAIRE LAB,F-75231 PARIS,FRANCE. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. CENS,ORME MERISIERS SPEC,F-91191 GIF SUR YVETTE,FRANCE. RP SHUTT, T (reprint author), UNIV CALIF BERKELEY,CTR PARTICLE ASTROPHYS,BERKELEY,CA 94609, USA. RI Stubbs, Christopher/C-2829-2012; Yvon, Dominique/D-2280-2015 OI Stubbs, Christopher/0000-0003-0347-1724; NR 19 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1993 VL 326 IS 1-2 BP 166 EP 171 DI 10.1016/0168-9002(93)90347-K PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200024 ER PT J AU LAAKSO, M SINGH, P ENGELS, E SHEPARD, PF AF LAAKSO, M SINGH, P ENGELS, E SHEPARD, PF TI OPERATION AND RADIATION-RESISTANCE OF A FOXFET BIASING STRUCTURE FOR SILICON STRIP DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY ID INTEGRATED COUPLING CAPACITORS; CHARGE DIVISION READOUT AB AC-coupled strip detectors biased with a FOXFET transistor structure have been studied. Measurement results for the basic operational characteristics of the FOXFET are presented together with a brief description of the physics underlying its operation. Radiation effects were studied using photons from a Cs-137 source. Changes in the FOXFET characteristics as a function of radiation dose up to 1 Mrad are reported. Results about the effect of radiation on the noise from a FOXFET biased detector are described. C1 RES INST HIGH ENERGY PHYS,HELSINKI,FINLAND. UNIV PITTSBURGH,DEPT PHYS & ASTRON,PITTSBURGH,PA 15260. RP LAAKSO, M (reprint author), FERMILAB NATL ACCELERATOR LAB,PARTICLE DETECTOR GRP,BATAVIA,IL 60510, USA. NR 14 TC 24 Z9 24 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 214 EP 221 DI 10.1016/0168-9002(93)90354-K PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200031 ER PT J AU VACCHI, A COX, PT GIACOMELLI, P CASTOLDI, A CHINNICI, S GATTI, E LONGONI, A PALMA, F SAMPIETRO, M REHAK, P BALLOCCHI, G KEMMER, J HOLL, P AF VACCHI, A COX, PT GIACOMELLI, P CASTOLDI, A CHINNICI, S GATTI, E LONGONI, A PALMA, F SAMPIETRO, M REHAK, P BALLOCCHI, G KEMMER, J HOLL, P TI BEAM TEST OF A LARGE AREA SILICON DRIFT DETECTOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY ID CHAMBER AB The results from the tests of the first large area (4 x 4 cm2) planar silicon drift detector prototype in a pion beam are reported. The measured position resolution in the drift direction is sigma = 40 +/- 10 mum. C1 POLITECN MILAN,CNR,DIPARTIMENTO ELETTRON QUANT & STRUMENTAZ ELETTRON,I-20133 MILAN,ITALY. BROOKHAVEN NATL LAB,UPTON,NY 11973. CERN,DIV PPE,CH-1211 GENEVA,SWITZERLAND. TU MUNCHEN,W-8046 GARCHING,GERMANY. KETEK GMBH,W-8048 HAIMHAUSEN,GERMANY. RI Giacomelli, Paolo/B-8076-2009; Vacchi, Andrea/C-1291-2010; Sampietro, Marco/A-3732-2016 OI Vacchi, Andrea/0000-0003-3855-5856; Sampietro, Marco/0000-0003-4825-9612 NR 10 TC 9 Z9 9 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 267 EP 272 DI 10.1016/0168-9002(93)90362-L PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200039 ER PT J AU CHEN, W KRANER, H LI, Z REHAK, P BERTUCCIO, G GATTI, E LONGONI, A SAMPIETRO, M HOLL, P KEMMER, J FASCHINGBAUER, U HESS, F JACOB, C WORNER, A WURM, JP BAUR, R DREES, A FISCHER, P GLASSEL, P GUNZEL, TF IRMSCHER, D OLSEN, L PFEIFFER, A SCHMIDT, B SCHOEN, A SPECHT, HJ ULLRICH, T TAPPROGGE, S WERMES, N BRESKIN, A CHECHIK, R DELOSHEROS, C STEINER, V TSERRUYA, I AF CHEN, W KRANER, H LI, Z REHAK, P BERTUCCIO, G GATTI, E LONGONI, A SAMPIETRO, M HOLL, P KEMMER, J FASCHINGBAUER, U HESS, F JACOB, C WORNER, A WURM, JP BAUR, R DREES, A FISCHER, P GLASSEL, P GUNZEL, TF IRMSCHER, D OLSEN, L PFEIFFER, A SCHMIDT, B SCHOEN, A SPECHT, HJ ULLRICH, T TAPPROGGE, S WERMES, N BRESKIN, A CHECHIK, R DELOSHEROS, C STEINER, V TSERRUYA, I TI PERFORMANCE OF THE MULTIANODE CYLINDRICAL SILICON DRIFT DETECTOR IN THE CERES NA45 EXPERIMENT - 1ST RESULTS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY AB A silicon drift detector of circular geometry giving unambiguously the radial and azimuthal coordinates of particle's interaction Point for events with high multiplicity is part of the experimental set up of the NA45 experiment-at CERN SPS. The paper reviews the characteristics of the detector and of its assembly among the other detectors of the experiment, The first experimental results showing the performance of the detector in term of resolution and its effectiveness in reconstructing the position of the event are reported. C1 POLITECN MILAN,I-20133 MILAN,ITALY. TU MUNCHEN,W-8046 GARCHING,GERMANY. KETEK GMBH,W-8048 HAIMHASEN,GERMANY. MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. UNIV HEIDELBERG,DEPT PHYS,W-6900 HEIDELBERG,GERMANY. WEIZMANN INST SCI,DEPT PHYS,IL-76100 REHOVOT,ISRAEL. RP CHEN, W (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. RI BRESKIN, AMOS/K-1549-2012; Sampietro, Marco/A-3732-2016; OI Sampietro, Marco/0000-0003-4825-9612; Perez de los Heros, Carlos/0000-0002-2084-5866 NR 8 TC 24 Z9 24 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 273 EP 278 DI 10.1016/0168-9002(93)90363-M PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200040 ER PT J AU KRANER, HW LI, Z FRETWURST, E AF KRANER, HW LI, Z FRETWURST, E TI THE USE OF THE SIGNAL CURRENT PULSE SHAPE TO STUDY THE INTERNAL ELECTRIC-FIELD PROFILE AND TRAPPING EFFECTS IN NEUTRON DAMAGED SILICON DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY AB The induced current pulse from ionizing events occurring near contacts on each side of a p+-n-n+ silicon junction detector may be used to map the electric field present in the detector. It is of interest to define the operative effects of fast neutron-induced displacement damage in detectors destined for high radiation environments in SSC or LHC. The hole current shape, in particular, has been useful to determine that the field maximum moves to the ''rear'' n+ contact as the material apparently changes to p-type at 8 x 10(12) 1 MeV n/cm2. Trapping times for both holes and electrons have been measured as a function of neutron fluence using the current pulse width to measure charge collection time as well as using calculated charge collection times. A clear linear relationship is found for the trapping probability (1/tau) versus neutron fluence. Current pulse shapes have been calculated for representative detector fields and mobility relationships and comparison with measured shapes is reasonable. C1 UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. RP KRANER, HW (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 15 TC 52 Z9 53 U1 1 U2 3 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 350 EP 356 DI 10.1016/0168-9002(93)90376-S PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200053 ER PT J AU BARBERIS, E BOISSEVAIN, JG CARTIGLIA, N ELLISON, JA FERGUSON, P FLEMING, JK HOLZSCHEITER, K JERGER, S JOYCE, D KAPUSTINSKY, JS LESLIE, J LIETZKE, C MATTHEWS, JAJ PALOUNEK, APT PITZL, D ROWE, WA SADROZINSKI, HFW SKINNER, D SOMMER, WF SONDHEIM, WE WIMPENNY, SJ ZIOCK, HJ AF BARBERIS, E BOISSEVAIN, JG CARTIGLIA, N ELLISON, JA FERGUSON, P FLEMING, JK HOLZSCHEITER, K JERGER, S JOYCE, D KAPUSTINSKY, JS LESLIE, J LIETZKE, C MATTHEWS, JAJ PALOUNEK, APT PITZL, D ROWE, WA SADROZINSKI, HFW SKINNER, D SOMMER, WF SONDHEIM, WE WIMPENNY, SJ ZIOCK, HJ TI TEMPERATURE EFFECTS ON RADIATION-DAMAGE TO SILICON DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 6TH EUROPEAN SYMP ON SEMICONDUCTOR DETECTORS CY FEB 24-26, 1992 CL MILAN, ITALY AB Motivated by the large particle fluences anticipated for the SSC and LHC, we are performing a systematic study of radiation damage to silicon microstrip detectors. Here we report radiation effects on detectors cooled to 0-degrees-C (the proposed operating point for a large SSC silicon tracker) including leakage currents and change in depletion voltage. We also present results on the annealing behavior of the radiation damage. Finally, we report results of charge collection measurements of the damaged detectors made with an Am-241 alpha source. C1 UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92521. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. RP BARBERIS, E (reprint author), UNIV CALIF SANTA CRUZ,SCIPP,SANTA CRUZ,CA 95064, USA. OI Ferguson, Phillip/0000-0002-7661-4223 NR 5 TC 45 Z9 45 U1 0 U2 3 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 MAR 1 PY 1993 VL 326 IS 1-2 BP 373 EP 380 DI 10.1016/0168-9002(93)90379-V PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KP972 UT WOS:A1993KP97200056 ER PT J AU DROSG, M DRAKE, DM AF DROSG, M DRAKE, DM TI FAST-NEUTRON YIELD FROM 20-MEV TRITONS ON WATER .1. TRITON INTERACTION WITH LIGHT WATER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB Double differential neutron yields from the interaction of 20-MeV tritons with water have been measured at five angles between 0 and 60-degrees in support of the design of a high-intensity neutron source for fusion applications with a 14-MeV cutoff energy. By subtracting the well-known yield from the interaction of tritons with hydrogen the neutron yield from the interaction with oxygen was obtained. This procedure allowed the extraction of the differential cross section of the reaction (O(t, n0)F)-O-16-F-18 at 19.5 MeV and of upper limits for this cross section from 16.5 to 18.5 MeV. Furthermore, this procedure corroborates the (H(t, n)He)-H-1-He-3 cross sections at higher energies within about 2%. The impact of the measured data on neutron generator design is discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DROSG, M (reprint author), UNIV VIENNA,INST EXPTL PHYS,BOLTZMANNGASSE 5,A-1090 VIENNA,AUSTRIA. 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 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAR PY 1993 VL 73 IS 3 BP 387 EP 391 DI 10.1016/0168-583X(93)95756-U PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KQ088 UT WOS:A1993KQ08800013 ER PT J AU DROSG, M DRAKE, DM HAIGHT, RC NELSON, RO AF DROSG, M DRAKE, DM HAIGHT, RC NELSON, RO TI FAST-NEUTRON YIELD FROM 20-MEV TRITONS ON WATER .2. TRITON INTERACTION WITH HEAVY-WATER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article AB Double differential neutron yields from the interaction of 20-MeV tritons with heavy water have been measured at eight angles between 0 and 156-degrees. From these data neutron yields following the interaction of 20-MeV tritons with oxygen in water between 75 and 156-degrees, and from the t-D break-up reactions between 0 and 75-degrees were derived. Furthermore, the suitability of this reaction for a high intensity neutron generator is discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP DROSG, M (reprint author), UNIV VIENNA,INST EXPTL PHYS,BOLTMANNGASSE 5,A-1090 VIENNA,AUSTRIA. 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 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAR PY 1993 VL 73 IS 3 BP 392 EP 397 DI 10.1016/0168-583X(93)95757-V PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KQ088 UT WOS:A1993KQ08800014 ER PT J AU KUTSCHERA, W AHMAD, I GLAGOLA, BG PARDO, RC REHM, KE BERKOVITS, D PAUL, M ARNOLD, JR NISHIIZUMI, K AF KUTSCHERA, W AHMAD, I GLAGOLA, BG PARDO, RC REHM, KE BERKOVITS, D PAUL, M ARNOLD, JR NISHIIZUMI, K TI ACCELERATOR MASS-SPECTROMETRY OF NI-59 IN EXTRATERRESTRIAL MATTER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID IONS; CA-41; SOLAR; METEORITES; PARTICLES AB Cosmic-ray produced Ni-59 (t1/2 = 76000 years) was detected in meteoritic and lunar material by AMS with fully stripped ions. At 641 MeV beam energy, a clean separation of Ni-59(28+) ions from Co-59(27+) background was achieved with a magnetic spectrograph. A background limit of Ni-59/Ni < 7 X 10(-14) was determined with a blank Ni sample. A Ni-59/Ni ratio of (2.3 +/- 0.4) x 10(-11) was measured in a sample from the Admire stony-iron (pallasite) meteorite, corresponding to a specific activity of 280 +/- 50 dpm/kg meteorite. In a surface layer of Apollo 16 lunar rock 68815, a Ni-59/Ni ratio of (8.8 +/- 3.3) x 10(-13) was measured (diluted with Ni carrier), corresponding to a specific activity of 4.1 +/- 1.5 dpm/kg rock. This result compares well with values calculated by Reedy from the (Fe(alpha, n)Ni)-Fe-56-Ni-59 reaction induced by solar cosmic ray alpha particles. Methodological aspects of the full-stripping technique and future possibilities of Ni-59 measurements in lunar materials are discussed. C1 HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. UNIV CALIF SAN DIEGO,DEPT CHEM,LA JOLLA,CA 92093. RP KUTSCHERA, W (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 38 TC 15 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAR PY 1993 VL 73 IS 3 BP 403 EP 412 DI 10.1016/0168-583X(93)95759-X PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KQ088 UT WOS:A1993KQ08800016 ER PT J AU ANDERSEN, E BARNES, PD BLAES, R CHERNEY, M DELACRUZ, B DIEBOLD, GE DULNY, B FERNANDEZ, C FRANKLIN, G GARABATOS, C GARZON, JA GEIST, WM GREINER, DE GRUHN, CR HAFIDOUNI, M HRUBEC, J JONES, PG JUDD, EG KUIPERS, JPM LADREM, M DEGUEVARA, PL LOVHOIDEN, G MACNAUGHTON, J MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G OGLE, WC DELOSHEROS, CP PLO, M PORTH, P POWELL, B QUINN, B RAMIL, A ROHRINGER, H SAKREJDA, I THORSTEINSEN, TF TRAXLER, J VOLTOLINI, C WOZNIAK, K YANEZ, A YEE, Y ZYBERT, R AF ANDERSEN, E BARNES, PD BLAES, R CHERNEY, M DELACRUZ, B DIEBOLD, GE DULNY, B FERNANDEZ, C FRANKLIN, G GARABATOS, C GARZON, JA GEIST, WM GREINER, DE GRUHN, CR HAFIDOUNI, M HRUBEC, J JONES, PG JUDD, EG KUIPERS, JPM LADREM, M DEGUEVARA, PL LOVHOIDEN, G MACNAUGHTON, J MOSQUERA, J NATKANIEC, Z NELSON, JM NEUHOFER, G OGLE, WC DELOSHEROS, CP PLO, M PORTH, P POWELL, B QUINN, B RAMIL, A ROHRINGER, H SAKREJDA, I THORSTEINSEN, TF TRAXLER, J VOLTOLINI, C WOZNIAK, K YANEZ, A YEE, Y ZYBERT, R TI STRANGE PARTICLE-PRODUCTION IN S-32+PB AND P+PB COLLISIONS AT 200-GEV/C PER NUCLEON SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN ID LAMBDA-BAR-PRODUCTION AB Cross sections for LAMBDA, LAMBDA and K-degrees production in S+Pb reaction at 200 GeV/c/n have been measured. Transverse momentum and rapidity distributions as well as the production dependence on event multiplicity are presented. An enhancement of strangeness production in mid-rapidity is observed. C1 LAWRENCE BERKELEY LAB,MAILSTOP 50D,1 CYCLOTRON RD,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,MAILSTOP 50D,1 CYCLOTRON RD,BERKELEY,CA 94720. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV BIRMINGHAM,DEPT PHYS,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. CERN,EUROPEAN ORG NUCL RES,CH-1211 GENEVA 23,SWITZERLAND. INST FIZ JADROWEJ,PL-30055 KRAKOW 30,POLAND. CIEMAT,DIV FIS PARTICULAS,E-28040 MADRID,SPAIN. CREIGHTON UNIV,DEPT PHYS,OMAHA,NE 68178. UNIV SANTIAGO,DPTO FIS PARTICULAS,E-15706 SANTIAGO,SPAIN. UNIV L PASTEUR,CNRS,IN2P3,CTR RECH NUCL,F-67037 STRASBOURG,FRANCE. INST HOCHENERGIEPHYS,A-1050 VIENNA,AUSTRIA. UNIV YORK,DEPT PHYS,YORK YO1 5DD,N YORKSHIRE,ENGLAND. CARNEGIE MELLON UNIV,DEPT PHYS,PITTSBURGH,PA 15213. RI de la Cruz, Begona/K-7552-2014; Plo Casasus, Maximo/M-1445-2014; Ramil, Alberto/B-4698-2008 OI Plo Casasus, Maximo/0000-0002-2289-918X; Ramil, Alberto/0000-0002-5333-9425 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 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 1 PY 1993 VL 553 BP C817 EP C820 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000095 ER PT J AU ANDIVAHIS, L BOSTED, P LUNG, A STUART, L ALSTER, J ARNOLD, R CHANG, C DIETRICH, F DODGE, W GEARHART, R GOMEZ, J GRIFFIOEN, K HICKS, R HYDEWRIGHT, C KEPPEL, C KUHN, S LICHTENSTADT, J MISKIMEN, R PETERSON, G PETRATOS, G ROCK, S ROKNI, S SAKUMOTO, W SPENGOS, M SWARTZ, K SZALATA, Z TAO, L AF ANDIVAHIS, L BOSTED, P LUNG, A STUART, L ALSTER, J ARNOLD, R CHANG, C DIETRICH, F DODGE, W GEARHART, R GOMEZ, J GRIFFIOEN, K HICKS, R HYDEWRIGHT, C KEPPEL, C KUHN, S LICHTENSTADT, J MISKIMEN, R PETERSON, G PETRATOS, G ROCK, S ROKNI, S SAKUMOTO, W SPENGOS, M SWARTZ, K SZALATA, Z TAO, L TI MEASUREMENTS OF THE NUCLEON FORM-FACTORS AT LARGE MOMENTUM-TRANSFERS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN ID ELECTRON-SCATTERING; EXCLUSIVE PROCESSES; PROTON AB New measurements of the electric G(E)(Q2) and magnetic G(M)(Q2) form factors of the nucleons are reported. The proton data cover the Q2 range from 1.75 to 8.83 (GeV/C)2 and the neutron data from 1.75 to 4.00 (GeV/c)2, more than doubling the range of previous data. Scaled by the dipole fit, G(D(Q2), the results for G(Mp)(Q2)/mu(p)G(D)(Q2) decrease smoothly from 1.05 to 0.92, while G(Ep)(Q2)/G(D)(Q2) is consistent with unity. The preliminary results for G(Mn)(Q2)/mu(n)G(D)(Q2) are consistent with unity, while G(En)2 is consistent with zero at all values of Q2. Comparisons are made to QCD Sum Rule, diquark, constituent quark, and VMD models, none of which agree with all of the new data. C1 LLNL,LIVERMORE,CA 94550. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. UNIV MARYLAND,COLL PK,MD 20742. NBS,GAITHERSBURG,MD 20899. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. STANFORD UNIV,STANFORD,CA 94305. CEBAF,NEWPORT NEWS,VA 23606. UNIV PENN,PHILADELPHIA,PA 19104. UNIV MASSACHUSETTS,AMHERST,MA 01003. UNIV WASHINGTON,SEATTLE,WA 98195. UNIV ROCHESTER,ROCHESTER,NY 14627. RP ANDIVAHIS, L (reprint author), AMERICAN UNIV,WASHINGTON,DC 20016, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 1 PY 1993 VL 553 BP C713 EP C716 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000078 ER PT J AU BAUER, W BOWMAN, DR CARLIN, N COLONNA, N DESOUZA, RT GELBKE, CK GONG, WG HANOLD, K KIM, YD LISA, MA LYNCH, WG MCMAHAN, MA MORETTO, LG PEASLEE, GF PHAIR, L TSANG, MB WILLIAMS, C WOZNIAK, GJ ZHU, F AF BAUER, W BOWMAN, DR CARLIN, N COLONNA, N DESOUZA, RT GELBKE, CK GONG, WG HANOLD, K KIM, YD LISA, MA LYNCH, WG MCMAHAN, MA MORETTO, LG PEASLEE, GF PHAIR, L TSANG, MB WILLIAMS, C WOZNIAK, GJ ZHU, F TI MULTIFRAGMENT EMISSION IN AR-36-AU-197 AND XE-129-AU-197 COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN ID NUCLEAR LATTICE MODEL; STATISTICAL MULTIFRAGMENTATION; AR-36+AU-197 COLLISIONS; FRAGMENTATION REACTIONS AB Multifragment disintegrations observed in Ar-36+Au-197 and Xe-129+Au-197 collisions are compared with theoretical predictions. C1 UNIV SAO PAULO,BR-01498 SAO PAULO,BRAZIL. LAWRENCE BERKELEY LAB,DIV NUCL SCI,BERKELEY,CA 94720. INDIANA UNIV,IUCF,BLOOMINGTON,IN 47405. RP BAUER, W (reprint author), MICHIGAN STATE UNIV,NSCL,E LANSING,MI 48824, USA. RI Carlin Filho, Nelson/C-2187-2012; Lynch, William/I-1447-2013; deSouza, Romualdo/P-5862-2015 OI Lynch, William/0000-0003-4503-176X; deSouza, Romualdo/0000-0001-5835-677X NR 21 TC 3 Z9 3 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 1 PY 1993 VL 553 BP C749 EP C752 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000084 ER PT J AU BIRCHALL, J BERDOZ, AR BOWMAN, JD CAMPBELL, JR DAVIS, CA DAVISON, NE GREEN, PW HAMIAN, A HEALEY, DC HELMER, R KORKMAZ, E LEVY, P MISCHKE, RE PAGE, SA RAMSAY, WD ROY, G SCHMOR, PW SOUKUP, J STINSON, GM STOCKI, TJ TITOV, NA VANOERS, WTH ZELENSKII, AN AF BIRCHALL, J BERDOZ, AR BOWMAN, JD CAMPBELL, JR DAVIS, CA DAVISON, NE GREEN, PW HAMIAN, A HEALEY, DC HELMER, R KORKMAZ, E LEVY, P MISCHKE, RE PAGE, SA RAMSAY, WD ROY, G SCHMOR, PW SOUKUP, J STINSON, GM STOCKI, TJ TITOV, NA VANOERS, WTH ZELENSKII, AN TI PARITY VIOLATION IN P-P SCATTERING SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN ID PROTON-PROTON-SCATTERING; NONCONSERVATION AB An outline is given of an experiment to measure parity violation in p-p scattering at 230 MeV at TRIUMF. The parity-violating longitudinal analysing power A(z) will be measured to a precision of 2 x 10(-8) and will isolate the parity-violating 3P2-1D2 partial wave amplitude. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. UNIV ALBERTA,DEPT PHYS,NUCL RES CTR,EDMONTON T6G 2N5,AB,CANADA. TRIUMF,VANCOUVER V6T 2A3,BC,CANADA. RUSSIAN ACAD SCI,INST NUCL RES,MOSCOW,RUSSIA. RP BIRCHALL, J (reprint author), UNIV MANITOBA,DEPT PHYS,WINNIPEG R3T 2N2,MANITOBA,CANADA. NR 6 TC 2 Z9 2 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 MAR 1 PY 1993 VL 553 BP C823 EP C826 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000096 ER PT J AU BOLLINGER, LM PARDO, RC SHEPARD, KW BILLQUIST, PJ BOGATY, JM CLIFFT, BE HARKEWICZ, R JOH, K MARKOVICH, PK MUNSON, FH ZINKANN, G NOLEN, JA AF BOLLINGER, LM PARDO, RC SHEPARD, KW BILLQUIST, PJ BOGATY, JM CLIFFT, BE HARKEWICZ, R JOH, K MARKOVICH, PK MUNSON, FH ZINKANN, G NOLEN, JA TI 1ST OPERATIONAL EXPERIENCE WITH THE POSITIVE-ION INJECTOR OF ATLAS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN AB A Positive-Ion Injector (PII) designed to enable ATLAS to accelerate all stable nuclei has been completed and successfully tested. This new injector system consists of an ECR source on a 350-kV platform coupled to a 12-MV superconducting injector linac formed with four different types of independently-phased 4-gap accelerating structures. The injector linac is configured to be optimum for the acceleration of uranium ions from 0.029 to almost-equal-to 1.l MeV/u. When ions with q/A > 0.1 are accelerated by PII and injected into the main ATLAS linac, CW beams with energies over 6 MeV/u can be delivered to the experimental areas. Since its completion in March 1992, PII has been tested by accelerating Si-30(7+), Ar-40(11+), Xe-132(13+), and Pe-208(24+). For all of these, transmission through the injector linac was almost-equal-to 100% of the pre-bunched beam, which corresponds to almost-equal-to 60% of the DC beam from the source. The accelerating fields of the superconducting resonators were somewhat greater than the design goals, and the whole system ran stably for long periods of time. RP BOLLINGER, LM (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 12 TC 0 Z9 0 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 MAR 1 PY 1993 VL 553 BP C859 EP C862 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000104 ER PT J AU BRISCOE, WJ BARLOW, DB BERMAN, BL CARESS, RW DHUGA, KS DRAGIC, SN GREENE, SJ ISENHOWER, D KNOWLES, D MACEK, D MATTHEWS, SK MOKHTARI, A NEFKENS, BMK NICHOLAS, NJ PILLAI, C PRICE, JW SADLER, ME SLAUS, I SUPEK, I TARAGIN, MF AF BRISCOE, WJ BARLOW, DB BERMAN, BL CARESS, RW DHUGA, KS DRAGIC, SN GREENE, SJ ISENHOWER, D KNOWLES, D MACEK, D MATTHEWS, SK MOKHTARI, A NEFKENS, BMK NICHOLAS, NJ PILLAI, C PRICE, JW SADLER, ME SLAUS, I SUPEK, I TARAGIN, MF TI PI+/- ELASTIC AND INELASTIC-SCATTERING FROM H-3 AND HE-3 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN ID CHARGE-SYMMETRY VIOLATION; OPTICAL-POTENTIAL ANALYSIS; ENERGY-DEPENDENCE; TRITIUM; SUPERRATIO; SYSTEM AB We have measured the differential cross sections for the scattering of pi+/- from H-3 and He-3. The dsigma's are normalized to pi+/-d elastic scattering measured under the same experimental conditions. Our newest measurements were performed at incident pion energies from 142 to 256 MeV and angles between 140-degrees and 180-degrees. The momentum-transfer dependence of the cross sections was measured up to 11 fM-2, making it possible to 'explore differences in the matter form factors of H-3 and He-3. C1 GEORGE WASHINGTON UNIV,DEPT PHYS,WASHINGTON,DC 20052. LANL,CLINTON P ANDERSON MESON PHYS FACIL,LOS ALAMOS,NM 87545. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. ABILENE CHRISTIAN UNIV,DEPT PHYS,ABILENE,TX 79699. RUDJER BOSKOVIC INST,YU-41001 ZAGREB,CROATIA. RP BRISCOE, WJ (reprint author), GEORGE WASHINGTON UNIV,CTR NUCL STUDIES,WASHINGTON,DC 20052, USA. NR 16 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 MAR 1 PY 1993 VL 553 BP C585 EP C588 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000055 ER PT J AU DUCRET, JE BERNHEIM, M BRUSSEL, MK CAPITANI, GP DANEL, JF DESANCTIS, E FRULLANI, S GARIBALDI, F GERARD, A GHIO, F IODICE, M JACKSON, HE LAKEHALAYAT, L LEGOFF, JM MAGNON, A MARCHAND, C MEZIANI, ZE MORGENSTERN, J VERNIN, P ZGHICHE, A AF DUCRET, JE BERNHEIM, M BRUSSEL, MK CAPITANI, GP DANEL, JF DESANCTIS, E FRULLANI, S GARIBALDI, F GERARD, A GHIO, F IODICE, M JACKSON, HE LAKEHALAYAT, L LEGOFF, JM MAGNON, A MARCHAND, C MEZIANI, ZE MORGENSTERN, J VERNIN, P ZGHICHE, A TI TEST OF BOUND NUCLEON FORM-FACTORS THROUGH (E,E'P) CROSS-SECTION MEASUREMENTS ON H-2, HE-3 AND HE-4 UP TO 0.9 GEV/C MOMENTUM-TRANSFER WITH L/T/TL SEPARATION SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN ID INELASTIC ELECTRON-SCATTERING; IMPULSE APPROXIMATION; RESPONSE FUNCTIONS; ELECTRODISINTEGRATION; TRANSVERSE AB The separation of the structure functions of the (e,e'p) cross-sections is presented. Results of this separation are given for light nuclei : H-2, He-3 and He-4 and a comparison with theoretical calculations is made. These results may be interpreted as a modification of the nucleon form-factors in the nuclear medium. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. INFN,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. I SUP SANTIA,FIS LAB,I-00161 ROME,ITALY. INFN,I-00161 ROME,ITALY. ARGONNE NATL LAB,ARGONNE,IL 60439. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. RP DUCRET, JE (reprint author), CENS,DAPNIA,SPHN,F-91191 GIF SUR YVETTE,FRANCE. RI Le Goff, Jean-Marc/E-7629-2013; GHIO, FRANCESCO/F-2092-2015 NR 19 TC 7 Z9 7 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 MAR 1 PY 1993 VL 553 BP C697 EP C700 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000074 ER PT J AU GONIN, M AF GONIN, M TI 1ST RESULTS WITH THE AU-BEAM AT THE AGS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN AB The first measurements using 11.6 A.GeV/c Au-197 beam have been made in April 1992 at the Tandem-Booster-AGS accelerator facilities. Preliminary results from different experiments are presented for Au + Au collisions. Experiment E-877 shows a large increase of the total transverse energy between Si + Al and Au + Au reactions. Experiment E-866 observes an increase of the K+/pi+ ratio (0.25 +/- 0.02) with respect the Si + Au ratio. RP GONIN, M (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. NR 12 TC 14 Z9 14 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 MAR 1 PY 1993 VL 553 BP C799 EP C812 PG 14 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000093 ER PT J AU KUHNERT, A WANG, TF STOYER, MA BECKER, JA HENRY, EA BRINKMAN, MJ YATES, SW DRAPER, JE DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS MACHIAVELLI, AO KELLY, WH KORTEN, W AZAIEZ, F CIZEWSKI, JA AF KUHNERT, A WANG, TF STOYER, MA BECKER, JA HENRY, EA BRINKMAN, MJ YATES, SW DRAPER, JE DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS MACHIAVELLI, AO KELLY, WH KORTEN, W AZAIEZ, F CIZEWSKI, JA TI OBLATE COLLECTIVITY IN PB-197, PB-198 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN ID PB ISOTOPES; EXCITATIONS; COEXISTENCE; STATES; NUCLEI AB Evidence for collective behavior in the high-spin region of neutron deficient lead nuclei is provided by the observation of four collective structures in Pb-197, Pb-198. These bands consist of strong dipole (M1) transitions with a few E2 crossover transitions observed. The transition energies of three of these bands show a rather regular behavior while those of one of them show an irregular behavior. We interpret the regular bands as oblate collective bands built on oblate proton and neutron states, whereas the irregular band might either be built on a state with very small oblate deformation, or be a triaxial rotational band. A lifetime measurement (DSAM) has been done for the regular bands in 198Pb . Neutron and proton configurations for the bands are suggested from the results of quasi particle Routhians and total Routhian surface (TRS) calculations. C1 UNIV KENTUCKY,LEXINGTON,KY 40506. UNIV CALIF DAVIS,DAVIS,CA 96511. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. COMIS NACL ENERGIA ATOM,RA-1429 BUENOS AIRES,DF,ARGENTINA. IOWA STATE UNIV SCI & TECHNOL,AMES,IA 50011. NIELS BOHR INST,COPENHAGEN,DENMARK. IPN ORSAY,F-91406 ORSAY,FRANCE. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. RP KUHNERT, A (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI KORTEN, Wolfram/H-3043-2013 NR 18 TC 8 Z9 8 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 MAR 1 PY 1993 VL 553 BP C567 EP C570 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000053 ER PT J AU MADEY, R ELAASAR, M ZHANG, WM SCHAMBACH, J KEANE, D ANDERSON, BD BALDWIN, AR WATSON, JW KREBS, G WEIMAN, H WESTFALL, GD GALE, C HAGLIN, K AF MADEY, R ELAASAR, M ZHANG, WM SCHAMBACH, J KEANE, D ANDERSON, BD BALDWIN, AR WATSON, JW KREBS, G WEIMAN, H WESTFALL, GD GALE, C HAGLIN, K TI PROBING THE NUCLEAR-MATTER EQUATION OF STATE WITH NEUTRONS FROM NUCLEUS-NUCLEUS COLLISIONS SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN ID HEAVY-ION COLLISIONS; MOMENTUM-DEPENDENT INTERACTIONS AB We report the first neutron triple-differential cross-sections measured in multiplicity-selected heavy-ion collisions. We examine the maximum azimuthal anisotropy ratio of these neutron cross-sections from 400 AMeV Nb-Nb and Au-Au collisions as a probe of the nuclear equation of state. Experiment reveals that this ratio does not depend on the mass of the colliding nuclei, contrary to the predictions of the Quantum Molecular Dynamics (QMD) transport theory. We compare the Nb-Nb data also with theoretical calculations done within the Boltzmann-Uehling-Uhlenbeck framework with both momentum-dependent and momentum-independent interactions. We find that the experiment is sensitive to the size of the nuclear incompressibility modulus K in the nuclear matter equation of state, and that the data demand a K value compatible with state-of-the-art nuclear matter calculations. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MICHIGAN STATE UNIV,E LANSING,MI 48823. MCGILL UNIV,MONTREAL H3A 2T8,QUEBEC,CANADA. RP MADEY, R (reprint author), KENT STATE UNIV,KENT,OH 44242, USA. 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 0375-9474 J9 NUCL PHYS A JI Nucl. Phys. A PD MAR 1 PY 1993 VL 553 BP C779 EP C784 PG 6 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000090 ER PT J AU WUOSMAA, AH BACK, BB BEARDEN, IG BETTS, RR FREER, M GEHRING, J GLAGOLA, BG HAPP, T HENDERSON, DJ WILT, P AF WUOSMAA, AH BACK, BB BEARDEN, IG BETTS, RR FREER, M GEHRING, J GLAGOLA, BG HAPP, T HENDERSON, DJ WILT, P TI EVIDENCE FOR ALPHA-PARTICLE CHAIN CONFIGURATIONS IN MG-24 SO NUCLEAR PHYSICS A LA English DT Article; Proceedings Paper CT INTERNATIONAL NUCLEAR PHYSICS CONF CY JUL 26-AUG 01, 1992 CL WIESBADEN, GERMANY SP INT UNION PURE & APPL PHYS, GERMAN PHYS SOC, EUROPEAN PHYS SOC, EUROPEAN COMMUNITIES, BUNDESMINIST FORSCH & TECHNOL, HESSISCHES MINIST WISSENSCH & KUNST, E MERCK CHEM, SIEMENS, IBM DEUTSCHLAND, DIGITAL EQUIPMENT MUNCHEN AB We have studied the strongly angular-momentum mismatched inelastic scattering reaction C-12(C-12,C-12(0(2)+))C-12(02+), using highly segmented silicon strip-detectors. A large enhancement is observed in the scattering cross section near a center-of-mass energy of 32.5 MeV, with dominant angular momenta near L=14-16 hBAR , which could be associated with highly-deformed alpha-Particle duster configurations in Mg-24. C1 PURDUE UNIV,DEPT PHYS,W LAFAYETTE,IN 47907. RP WUOSMAA, AH (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Freer, Martin/F-9379-2013; Bearden, Ian/M-4504-2014 OI Bearden, Ian/0000-0003-2784-3094 NR 8 TC 0 Z9 0 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 MAR 1 PY 1993 VL 553 BP C563 EP C566 PG 4 WC Physics, Nuclear SC Physics GA KU230 UT WOS:A1993KU23000052 ER PT J AU LAENEN, E RIEMERSMA, S SMITH, J VANNEERVEN, WL AF LAENEN, E RIEMERSMA, S SMITH, J VANNEERVEN, WL TI O(ALPHA-S) CORRECTIONS TO HEAVY-FLAVOR INCLUSIVE DISTRIBUTIONS IN ELECTROPRODUCTION SO NUCLEAR PHYSICS B LA English DT Article AB We examine the O(alpha(S)) corrections to inclusive heavy-flavour differential distributions in transverse momentum and rapidity in electroproduction. We assume that the electron is tagged and present results for fixed x and Q2 for c-quark production at HERA. C1 SUNY STONY BROOK,INST THEORET PHYS,STONY BROOK,NY 11794. LEIDEN UNIV,INST LORENTZ,2300 RA LEIDEN,NETHERLANDS. RP LAENEN, E (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 16 TC 119 Z9 120 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 MAR 1 PY 1993 VL 392 IS 1 BP 229 EP 250 DI 10.1016/0550-3213(93)90202-Z PG 22 WC Physics, Particles & Fields SC Physics GA KU464 UT WOS:A1993KU46400008 ER PT J AU MACKENZIE, PB AF MACKENZIE, PB TI HEAVY QUARK PHYSICS SO NUCLEAR PHYSICS B LA English DT Article ID SPIN-DEPENDENT FORCES; CONTINUUM-LIMIT; LATTICE THEORIES; SYSTEMS; QCD; MODEL AB Lattice calculations of heavy quark systems provide very good measures of the lattice spacing, a key element in recent determinations of the strong coupling constant using lattice methods. They also provide excellent testing grounds for lattice methods in general. I review recent phenomenological and technical developments in this field. C1 FERMILAB NATL ACCELERATOR LAB, THEORET PHYS GRP, BATAVIA, IL 60510 USA. NR 48 TC 47 Z9 47 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 MAR PY 1993 SU 30 BP 35 EP 49 DI 10.1016/0920-5632(93)90176-7 PG 15 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300004 ER PT J AU FISCHLER, M GAO, M HOCKNEY, G ISELY, M UCHIMA, M AF FISCHLER, M GAO, M HOCKNEY, G ISELY, M UCHIMA, M TI REDUCING COMMUNICATION INEFFICIENCIES FOR A FLEXIBLE PROGRAMMING PARADIGM SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM AB The ACPMAPS system at Fermilab has been upgraded to 50 GF by inserting new CPU modules, based on the Intel 1860. This ten-fold increase in power, utilizing the identical communications backbone, places the system in a different realm: The transfer latency and overheads are now greater, relative to the cost of a floating point operation. We explore the consequences for programs written using CANOPY, which relies on low communications latencies. We present techniques for alleviating the efficiency decrease, by coalescing transfers, without abandoning the considerable advantages of the CANOPY paradigm. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. NR 4 TC 1 Z9 1 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 MAR PY 1993 SU 30 BP 301 EP 304 DI 10.1016/0920-5632(93)90214-Q PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300042 ER PT J AU BITAR, KM EDWARDS, R GOTTLIEB, S HELLER, UM KENNEDY, AD KIM, S KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL SINCLAIR, DK SUGAR, RL TEPER, M TOUSSAINT, D WANG, KC AF BITAR, KM EDWARDS, R GOTTLIEB, S HELLER, UM KENNEDY, AD KIM, S KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL SINCLAIR, DK SUGAR, RL TEPER, M TOUSSAINT, D WANG, KC TI QCD WITH 2 LIGHT QUARK FLAVORS - THERMODYNAMICS ON A 16(3)X8 LATTICE AND GLUEBALLS AND TOPOLOGICAL CHARGE ON A 16(3)X32 LATTICE SO NUCLEAR PHYSICS B LA English DT Article AB The HTMCGC collaboration has been simulating lattice QCD with two light staggered quarks with masses m(q) = 0.0125 and also m(q) = 0.00625 on a 16(3) x 8 lattice. We have been studying the behaviour of the transition from hadronic matter to a quark-gluon plasma and the properties of that plasma. We have been measuring entropy densities, Debye and hadronic screening lengths, the spacial string tension and topological susceptibility in addition to the standard order parameters. The HEMCGC collaboration has simulated lattice QCD with two light staggered quarks, m(q) = 0.025 and m(q) = 0.010 on a 16(3) x 32 lattice. We have measured the glueball spectrum and topological susceptibilities for these runs. C1 FLORIDA STATE UNIV, SCRI, TALLAHASSEE, FL 32306 USA. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. ARGONNE NATL LAB, DIV HEP, ARGONNE, IL 60439 USA. THINKING MACHINES CORP, CAMBRIDGE, MA 02142 USA. UNIV ILLINOIS, DEPT PHYS, URBANA, IL 61801 USA. WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. UNIV CENT FLORIDA, DEPT PHYS, ORLANDO, FL 32816 USA. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV OXFORD, ALL SOULS COLL, OXFORD OX1 3NP, ENGLAND. UNIV OXFORD, DEPT THEORET PHYS, OXFORD OX1 3NP, ENGLAND. UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. UNIV NEW S WALES, SCH PHYS, KENSINGTON, NSW 2203, AUSTRALIA. NR 11 TC 6 Z9 6 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 MAR PY 1993 SU 30 BP 315 EP 318 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300044 ER PT J AU BERNARD, C DEGRAND, TA DETAR, C GOTTLIEB, S KRASNITZ, A SUGAR, RL TOUSSAINT, D AF BERNARD, C DEGRAND, TA DETAR, C GOTTLIEB, S KRASNITZ, A SUGAR, RL TOUSSAINT, D TI FINITE SIZE EFFECTS ON THE QCD SPECTRUM REVISITED SO NUCLEAR PHYSICS B LA English DT Article ID HADRON SPECTRUM; LATTICE; FLAVORS; MASSES AB We have continued our study of finite size effects in the QCD spectrum on lattices ranging in size from 8(3) x 24 to 16(3) x 24. We have increased our statistics for quark mass am(q) = 0.025 for the smallest lattice size. In addition, we have studied quark mass 0.0125 for lattice sizes 12(3) x 24 and 16(3) x 24. These lattice sizes correspond to a box 1.8-3.6 fm on a side when the rho mass at zero quark mass is used to set the scale. We discuss the nucleon to rho mass ratio at a smaller value of m(pi)/m(rho) than previously studied with two dynamical flavors. C1 WASHINGTON UNIV, DEPT PHYS, ST LOUIS, MO 63130 USA. UNIV COLORADO, DEPT PHYS, BOULDER, CO 80309 USA. UNIV UTAH, DEPT PHYS, SALT LAKE CITY, UT 84112 USA. INDIANA UNIV, DEPT PHYS, BLOOMINGTON, IN 47405 USA. BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV CALIF SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. UNIV ARIZONA, DEPT PHYS, TUCSON, AZ 85721 USA. OI DeTar, Carleton/0000-0002-0216-6771 NR 13 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 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR PY 1993 SU 30 BP 369 EP 372 DI 10.1016/0920-5632(93)90229-Y PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300057 ER PT J AU KIM, S SINCLAIR, DK AF KIM, S SINCLAIR, DK TI HADRON SPECTRUM OF QUENCHED QCD ON A 32(3)X64 LATTICE SO NUCLEAR PHYSICS B LA English DT Article AB Preliminary results from a hadron spectrum calculation of quenched Quantumchromodynamics on a 32(3) x 64 lattice at beta = 6.5 are reported. The hadron spectrum calculation is done with staggered quarks of masses, m(q)a = 0.01, 0.005 and 0.0025. We use two different sources in order to be able to extract the DELTA mass in addition to the usual local light hadron masses. The numerical simulation is executed on the Intel Touchstone Delta computer. The peak speed of the Delta for a 16 x 32 mesh configuration is 41 Gflops for 32 bit precision. The sustained speed for our updating code is 9.5 Gflops. A multihit metropolis algorithm combined with an over-relaxation method is used in the updating and the conjugate gradient method is employed for Dirac matrix inversion. Configurations are stored every 1000 sweeps. C1 ARGONNE NATL LAB, DIV HIGH ENERGY PHYS, ARGONNE, IL 60439 USA. NR 8 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 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR PY 1993 SU 30 BP 381 EP 384 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300060 ER PT J AU BITAR, KM DEGRAND, TA EDWARDS, R GOTTLIEB, S HELLER, UM KENNEDY, AD KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL SINCLAIR, DK SUGAR, RL TOUSSAINT, D WANG, KC AF BITAR, KM DEGRAND, TA EDWARDS, R GOTTLIEB, S HELLER, UM KENNEDY, AD KOGUT, JB KRASNITZ, A LIU, W OGILVIE, MC RENKEN, RL SINCLAIR, DK SUGAR, RL TOUSSAINT, D WANG, KC TI HADRON SPECTROSCOPY WITH DYNAMIC WILSON FERMIONS AT BETA=5.3 SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID QCD AB We present results from simulations of lattice QCD using two flavors of dynamical Wilson fermions at a lattice coupling beta = 5.3 on 16(3) x 32 lattice, at two hopping parameters, kappa = 0.1670 and 0.1675, leading to m(pi) almost-equal-to 0.44 and 0.33 respectively. We show spectroscopy for S-wave hadrons and compare our results to other recent simulations with dynamical Wilson fermions. C1 FLORIDA STATE UNIV,SCRI,TALLAHASSEE,FL 32306. UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. INDIANA UNIV,DEPT PHYS,BLOOMINGTON,IN 47405. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. UNIV CENT FLORIDA,DEPT PHYS,ORLANDO,FL 32816. ARGONNE NATL LAB,DIV HEP,ARGONNE,IL 60439. UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. UNIV NEW S WALES,SCH PHYS,KENSINGTON,NSW 2033,AUSTRALIA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR PY 1993 SU 30 BP 401 EP 404 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300065 ER PT J AU SCHAFFER, W AF SCHAFFER, W TI HADRON MASSES ON A 32(4) LATTICE AT BETA=5.7 SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM AB We continue our study of the hadron spectrum at beta = 5.7 on a 32(4) volume with two flavors of dynamical, staggered fermions [1]. We present results from simulations with a quark mass of ma = 0.025 and give a progress report on currently running simulations with a mass of ma = 0.01. Our calculations use the hybrid algorithm [2]. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. 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 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR PY 1993 SU 30 BP 405 EP 408 DI 10.1016/0920-5632(93)90238-2 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300066 ER PT J AU GUPTA, R DANIEL, D GRANDY, J AF GUPTA, R DANIEL, D GRANDY, J TI MESON FORM-FACTORS AND WAVE-FUNCTIONS WITH WILSON FERMIONS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM AB Results for semi-leptonic form-factors for processes like D --> Klnu and the Bethe-Salpeter amplitudes (BSA) for pion and rho mesons are presented. The form-factor data is consistent with previous calculations. We find that the long distance fall-off of BSA for both pi and rho is very well fit by an exponential, but surprisingly the effective mass governing this fall-off is lighter than the pion's. Lastly, by studying the dependence of rho polarization on separation direction we show that there is a measureable l = 2 state in addition to l = 0 in the BSA for the rho. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 6 TC 4 Z9 4 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 MAR PY 1993 SU 30 BP 419 EP 422 DI 10.1016/0920-5632(93)90241-W PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300069 ER PT J AU DUNCAN, A EICHTEN, E ELKHADRA, AX FLYNN, JM HILL, BR THACKER, H AF DUNCAN, A EICHTEN, E ELKHADRA, AX FLYNN, JM HILL, BR THACKER, H TI PROPERTIES OF LOW-LYING HEAVY-LIGHT MESONS SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID RENORMALIZATION; LATTICE AB We present preliminary results for f(B) and masses of low-lying heavy-light mesons in the static limit. Calculations were performed in the quenched approximation using multistate smearing functions generated from a Hamiltonian for a spinless relativistic quark. The 2S-1S and 1P-1S mass splittings are measured. Using the 1P-1S charmonium splitting to set the overall scale, the ground state decay constant f(B), is 319 +/- 11(stat) MeV. C1 UNIV PITTSBURGH,DEPT PHYS,PITTSBURGH,PA 15260. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV SOUTHAMPTON,DEPT PHYS,SOUTHAMPTON SO9 5NH,HANTS,ENGLAND. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90025. UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901. NR 15 TC 14 Z9 14 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 MAR PY 1993 SU 30 BP 433 EP 440 DI 10.1016/0920-5632(93)90244-Z PG 8 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300072 ER PT J AU DUNCAN, A EICHTEN, E THACKER, H AF DUNCAN, A EICHTEN, E THACKER, H TI HEAVY-LIGHT WAVE-FUNCTIONS IN LATTICE QCD SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM AB Using a multistate smearing method, Coulomb gauge wave functions of heavy-light mesons are studied in lattice QCD. Wave functions for the ground state, the first radially excited S-wave state, and the lowest P-wave states of a heavy-light meson are calculated in quenched approximation. The results are found to be in remarkably good agreement with the predictions of a simple relativistic quark model. C1 UNIV PITTSBURGH,DEPT PHYS & ASTRON,PITTSBURGH,PA 15260. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV VIRGINIA,DEPT PHYS,CHARLOTTESVILLE,VA 22901. NR 11 TC 10 Z9 10 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 MAR PY 1993 SU 30 BP 441 EP 444 DI 10.1016/0920-5632(93)90245-2 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300073 ER PT J AU KRONFELD, AS AF KRONFELD, AS TI THE CHARM QUARK ON THE LATTICE SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID SPIN-DEPENDENT FORCES; WILSON FERMIONS; QCD AB We formulate lattice fermions in a way that encompasses Wilson fermions as well as the static and non-relativistic approximations. In particular, we treat m(q)alpha systematically (m(q) is the fermion mass) showing how to understand the Wilson action as an effective action for systems with p << m(q). The results show how to extract matrix elements and the spectrum from simulations with m(q)a almost-equal-to 1, which is relevant for the charm quark. C1 FERMILAB NATL ACCELERATOR LAB,THEORET PHYS GRP,BATAVIA,IL 60510. NR 13 TC 46 Z9 46 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 MAR PY 1993 SU 30 BP 445 EP 448 DI 10.1016/0920-5632(93)90246-3 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300074 ER PT J AU ELKHADRA, AX AF ELKHADRA, AX TI THE CHARMONIUM SPECTRUM ON THE LATTICE - A STATUS-REPORT SO NUCLEAR PHYSICS B LA English DT Article ID SYSTEMS AB We present our most recent results on the charmonium spectrum using relativistic Wilson fermions. We study the dependence of the spectrum on the charm quark mass and the Wohlert-Sheikholeslami improvement term. C1 FERMILAB NATL ACCELERATOR LAB, THEORY GRP, BATAVIA, IL 60510 USA. NR 11 TC 31 Z9 31 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 MAR PY 1993 SU 30 BP 449 EP 452 DI 10.1016/0920-5632(93)90247-4 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300075 ER PT J AU BERNARD, C LABRENZ, J SONI, A AF BERNARD, C LABRENZ, J SONI, A TI RESULTS FOR F(B) AND F(D) AT BETA=6.3 SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID DECAY CONSTANT; LATTICE; MESON; RENORMALIZATION AB We have computed the decay constants for the B and D mesons, using quenched lattices at beta = 6.3, by interpolating between the static approximation of Eichten and the conventional (''heavy'' Wilson fermion) method. A more careful treatment of the static result using better sources with longer time-displacements and a modification to the Wilson quark normalization to correct approximately for lattice effects in the large-am regime have led to the elimination of the large discrepancy between the two methods which had been previously observed. We report final results, with estimates of various systematic errors. C1 WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 12 TC 23 Z9 23 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 MAR PY 1993 SU 30 BP 465 EP 468 DI 10.1016/0920-5632(93)90251-Z PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300079 ER PT J AU BERNARD, CW SHEN, Y SONI, A AF BERNARD, CW SHEN, Y SONI, A TI CALCULATING THE ISGUR-WISE FUNCTION ON THE LATTICE SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID MESON DECAY CONSTANTS; SEMILEPTONIC DECAYS AB We calculate the Isgur-Wise function by measuring the heavy-heavy meson transition matrix element on the lattice. The standard Wilson action is used for both the heavy and light quarks. Our first numerical results are presented. C1 WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. BOSTON UNIV,DEPT PHYS,BOSTON,MA 02215. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 17 TC 12 Z9 12 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 MAR PY 1993 SU 30 BP 473 EP 476 DI 10.1016/0920-5632(93)90253-3 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300081 ER PT J AU MANDULA, JE OGILVIE, MC AF MANDULA, JE OGILVIE, MC TI THE ISGUR-WISE LIMIT ON THE LATTICE SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID HEAVY MESONS; DECAYS AB We construct the Isgur-Wise limit of QCD in a form appropriate to lattice gauge theory techniques. The formulation permits a calculation of heavy quark processes even when the momentum transfers are much larger than the inverse lattice spacing. Applications include semi-leptonic heavy quark decay and scattering processes, including the computation of the nonperturbative part of the Isgur-Wise universal function. C1 US DOE,DEPT HIGH ENERGY PHYS,WASHINGTON,DC 20585. WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. 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 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR PY 1993 SU 30 BP 477 EP 480 DI 10.1016/0920-5632(93)90254-4 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300082 ER PT J AU CHU, MC GRANDY, JM HUANG, S NEGELE, JW AF CHU, MC GRANDY, JM HUANG, S NEGELE, JW TI LATTICE ANALYSIS OF 2-POINT HADRONIC CORRELATORS IN THE QCD VACUUM SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID MESONS AB Results from the first lattice QCD analysis of vacuum correlators of local hadronic currents using dispersion relations are presented. We have explored the vector, pseudoscalar, axial, and scalar meson channels, and the proton-like and delta-like baryon channels. The lattice results are shown to agree qualitatively with experimental results in channels where experimental data exist, and shed insight into interacting instanton approximations and sum rule calculations in the other channels. C1 CALTECH,KELLOGG LAB,PASADENA,CA 91125. LOS ALAMOS NATL LAB,GRP T8,LOS ALAMOS,NM 87545. UNIV WASHINGTON,DEPT PHYS,SEATTLE,WA 98195. MIT,CTR THEORET PHYS,NUCL SCI LAB,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0550-3213 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR PY 1993 SU 30 BP 495 EP 498 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300086 ER PT J AU BERNARD, C PARRINELLO, C SONI, A AF BERNARD, C PARRINELLO, C SONI, A TI THE GLUON PROPAGATOR IN MOMENTUM SPACE SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID LATTICE; GAUGE AB We consider quenched QCD on a 16(3) x 40 lattice at beta = 6.0 . We give preliminary numerical results for the lattice gluon propagator evaluated both in coordinate and momentum space. Our findings are compared with earlier results in the literature at zero momentum. In addition, by considering nonzero momenta we attempt to extract the form of the propagator and compare it to continuum predictions formulated by Gribov and others. C1 WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. NYU,DEPT PHYS,NEW YORK,NY 10003. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. NR 10 TC 11 Z9 11 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 MAR PY 1993 SU 30 BP 535 EP 538 DI 10.1016/0920-5632(93)90267-A PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300095 ER PT J AU BODWIN, GT KOVACS, EV AF BODWIN, GT KOVACS, EV TI A STREAMLINED METHOD FOR CHIRAL FERMIONS ON THE LATTICE SO NUCLEAR PHYSICS B LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON LATTICE FIELD THEORY ( LATTICE 92 ) CY SEP 15-19, 1992 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP CRAY RES, IBM NEDERLAND, THINKING MACHINES, SHELL NEDERLAND, RIJKSUNIV UTRECHT, NEDERLANDSE ORG WETENSCHAPPELIJK ONDERZOEK, KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS HO UNIV AMSTERDAM ID NEUTRINOS AB We discuss the use of renormalization counterterms to restore the chiral gauge symmetry in a lattice theory of Wilson fermions. We show that a large class of counterterms can be implemented automatically by making a simple modification to the fermion determinant. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. NR 9 TC 8 Z9 8 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 MAR PY 1993 SU 30 BP 617 EP 620 DI 10.1016/0920-5632(93)90287-G PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300115 ER PT J AU GOCKSCH, A AF GOCKSCH, A TI A STUDY OF THE N=2 KAZAKOV-MIGDAL MODEL SO NUCLEAR PHYSICS B LA English DT Article ID PHASE-STRUCTURE; GAUGE AB We present a numerical study of the SU(2) Kazakov-Migdal model ('induced QCD'). We show that the model has a line of first order phase transitions terminating in a critical point. The adjoint plaquette has a clear discontinuity across the phase transition, whereas the plaquette in the fundamental representation is always zero in accordance with Elitzur's theorem. The density of small Z2 monopoles shows very little variation and is always large. We also find that the model has extra local U(1) symmetries which do not exist in the case of the standard adjoint theory. The relevance of these and other findings for the possibility of 'inducing' QCD is discussed. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. NR 18 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 EI 1873-1562 J9 NUCL PHYS B JI Nucl. Phys. B PD MAR PY 1993 SU 30 BP 804 EP 807 DI 10.1016/0920-5632(93)90330-9 PG 4 WC Physics, Particles & Fields SC Physics GA KX823 UT WOS:A1993KX82300158 ER PT J AU TORCZYNSKI, JR NEAL, DR AF TORCZYNSKI, JR NEAL, DR TI TRANSIENT GAS MOTION IN NUCLEAR-REACTOR-PUMPED LASERS - COMPUTATIONAL AND EXPERIMENTAL RESULTS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID ENERGY DEPOSITION; CO AB In many types of nuclear-reactor-pumped lasers, the fission fragments that are used to excite gaseous lasing species heat the gas in a spatially nonuniform manner. This heating nonuniformity induces transient gas motion, which results in density and refractive-index gradients that affect the laser's optical behavior. A computational model of the transient gas motion is developed using the acoustic filtering methodology, which neglects the spatial variation of the pressure. This model incorporates the effect of spatially varying gas density on fission-fragment heating. Gas motion out of the laser cell into small, rapidly cooled regions is treated as a volumetric mass loss distributed over the laser cell. Although these regions have a relatively small fraction of the total volume, a large amount of gas can flow into them during the heating because of the rapid cooling therein. This gas removal from the cell during pumping, neglected in previous analyses, is important because fission-fragment heating is strongly dependent on local gas density. To quantify the laser's optical behavior, experiments are performed in which a probe laser beam is passed through the laser cell. This probe beam acquires a wavefront distortion from the refractive-index gradients and is imaged on to a wavefront slope sensor, which yields temporally and spatially resolved measurements of the angular deflection (wavefront slope) of the probe laser beam. Experimental and computed results for this quantity exhibit reasonable agreement over a wide range of pressures and heating amplitudes. C1 SANDIA NATL LABS,CTR PHYS & CHEM SCI,ALBUQUERQUE,NM 87185. RP TORCZYNSKI, JR (reprint author), SANDIA NATL LABS,CTR ENGN SCI,ALBUQUERQUE,NM 87185, USA. OI Neal, Daniel/0000-0002-1144-3187 NR 49 TC 7 Z9 7 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD MAR PY 1993 VL 113 IS 3 BP 189 EP 206 PG 18 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KP629 UT WOS:A1993KP62900001 ER PT J AU DEPIANTE, EV AF DEPIANTE, EV TI STABILITY ANALYSIS OF A LINEAR REACTOR SYSTEM WITH FEEDBACK UNDER LOW-FLOW, LOW-POWER CONDITIONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article AB Part of the reactor design process is performance evaluation according to predefined criteria, including reactor stability behavior under different conditions. This work focuses on the stability characterization of a reactor system with feedback under low reactor power, low reactor coolant flow conditions. Such conditions might be encountered, for example, after a loss of flow without scram in some passively safe reactor designs. Algebraic and frequency stability-criteria-based methods are developed to find stability regions, stability boundary surface in system parameter space, and frequency of oscillation at oscillatory instability boundaries. Models are developed for the reactor, its detailed thermal-hydraulic reactivity feedback path associated with coolant outlet temperature, and decay heat. Developed stability analysis tools are applied to the system model. A unique aspect is the assessment of the influence of decay heat on stability. Other selected parameters are the following: temperature coefficient of reactivity, reactor coolant flow, and natural-circulation flow. The result is a stability boundary surface in four-dimensional system parameter space and its associated frequency of oscillation surface. Adopting model parameter values from two reactors results in system parameters within the stable region. Conditions for system parameters to remain in the stable region are identified. RP DEPIANTE, EV (reprint author), ARGONNE NATL LAB,DIV REACTOR ANAL,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 20 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD MAR PY 1993 VL 113 IS 3 BP 251 EP 263 PG 13 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KP629 UT WOS:A1993KP62900006 ER PT J AU DAMIANO, B MARCHLEUBA, JA EULER, JA AF DAMIANO, B MARCHLEUBA, JA EULER, JA TI APPLICATION OF GALERKIN METHOD TO CALCULATE THE BEHAVIOR OF BOILING WATER-REACTORS DURING LIMIT-CYCLE OSCILLATIONS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Note AB A technique for calculating an approximation to the time-dependent power of a boiling water reactor (BWR) during steady-state, low-amplitude limit-cycle oscillations is described. An approximate solution is obtained from the application of Galerkin's method to a BWR dynamic model consisting of the point-kinetics equations and the power-to-reactivity feedback transfer function; such a feedback transfer function can be obtained from linear frequency domain stability codes, such as the LAPUR code. The approximate solution technique is described, and comparisons of approximate solutions with numerical results and measured data are given. It is concluded from these comparisons that the application of Galerkin's method to the equations obtained from this particular BWR dynamic model can be used to extend results from a linear frequency domain stability code to calculate nonlinear, time-dependent reactor parameters during low-amplitude limit-cycle oscillations. C1 UNIV TENNESSEE,DEPT MECH ENGN,KNOXVILLE,TN 37996. RP DAMIANO, B (reprint author), OAK RIDGE NATL LAB,DIV INSTRUMENTAT & CONTROLS,OAK RIDGE,TN 37831, USA. NR 12 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 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD MAR PY 1993 VL 113 IS 3 BP 271 EP 281 PG 11 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KP629 UT WOS:A1993KP62900008 ER PT J AU POWERS, DA COPUS, ER BRADLEY, DR AF POWERS, DA COPUS, ER BRADLEY, DR TI RESULTS OF RECENT INVESTIGATIONS AT SANDIA-NATIONAL-LABORATORIES ON CORE DEBRIS INTERACTIONS WITH CONCRETE SO NUCLEAR TECHNOLOGY LA English DT Article; Proceedings Paper CT SESSION ON SEVERE ACCIDENT TECHNOLOGY, AT THE MEETING OF THE AMERICAN NUCLEAR SOC CY JUN, 1991 CL ORLANDO, FL SP AMER NUCL SOC DE MOLTEN CORE INTERACTIONS; CONTAINMENT SAFETY STUDIES; CORE-CONCRETE HEAT TRANSFER AB Studies of core debris interaction with concrete have been extensive over the last decade. These studies have reached a climax in recent tests of the interactions of prototypical melts of UO2, ZrO2, zirconium, and stainless steel with concrete. Zirconium metal has been found to have profound effects on melt interactions with concrete. Zirconium metal reacts with condensed-phase products of concrete decomposition as well as with steam and carbon dioxide evolved from the concrete. Models of core debris interactions with concrete have been modified to include heat produced by the condensed-phase reactions of zirconium. The modified models predict well the high-temperature interactions of prototypical melts with concrete. Discrepancies between predictions and observations are being addressed by improving models of phase relationships in the melt-concrete system. C1 SCI APPLICAT INT CORP,ALBUQUERQUE,NM. SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185. RP POWERS, DA (reprint author), SANDIA NATL LABS,NUCL ENERGY TECHNOL DIRECTORATE,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 20 TC 1 Z9 1 U1 0 U2 1 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5450 J9 NUCL TECHNOL JI Nucl. Technol. PD MAR PY 1993 VL 101 IS 3 BP 255 EP 261 PG 7 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KN042 UT WOS:A1993KN04200002 ER PT J AU KRESS, TS BEAHM, EC WEBER, CF PARKER, GW AF KRESS, TS BEAHM, EC WEBER, CF PARKER, GW TI FISSION-PRODUCT TRANSPORT BEHAVIOR SO NUCLEAR TECHNOLOGY LA English DT Article; Proceedings Paper CT SESSION ON SEVERE ACCIDENT TECHNOLOGY, AT THE MEETING OF THE AMERICAN NUCLEAR SOC CY JUN, 1991 CL ORLANDO, FL SP AMER NUCL SOC DE FISSION PRODUCT TRANSPORT; IODINE; SEVERE ACCIDENTS AB Some recent advances in the knowledge base with respect to the ability to calculate fission product transport behavior in the reactor coolant system (RCS) and the containment for light water reactor severe accident conditions are discussed. Only minor advances are noted with respect to aerosol behavior. These include improvement in the understanding and modeling of impaction behavior, homogeneous and heterogeneous nucleation, vapor/aerosol interactions, hygroscopic behavior of aerosols, and decomposition of CsI in the presence of hydrogen flames. The focus is the influence of chemical phenomena on the behavior of fission product iodine. A review is given of new work on the chemical forms released from the RCS as they are affected by gas-phase chemical kinetics, reactions with surfaces, the presence of boric acid, and revaporization from surfaces. Also reviewed is recent work on hydrolysis and radiolysis reactions in water pools in containments to determine the potential for revolatilizing iodine species back into the containment atmosphere. RP KRESS, TS (reprint author), OAK RIDGE NATL LAB,APPL SYST TECHNOL SECT,OAK RIDGE,TN 37831, USA. NR 22 TC 5 Z9 5 U1 2 U2 2 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 MAR PY 1993 VL 101 IS 3 BP 262 EP 269 PG 8 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KN042 UT WOS:A1993KN04200003 ER PT J AU HOBBINS, RR PETTI, DA HAGRMAN, DL AF HOBBINS, RR PETTI, DA HAGRMAN, DL TI FISSION-PRODUCT RELEASE FROM FUEL UNDER SEVERE ACCIDENT CONDITIONS SO NUCLEAR TECHNOLOGY LA English DT Article; Proceedings Paper CT SESSION ON SEVERE ACCIDENT TECHNOLOGY, AT THE MEETING OF THE AMERICAN NUCLEAR SOC CY JUN, 1991 CL ORLANDO, FL SP AMER NUCL SOC DE FISSION PRODUCTS; FUEL; SEVERE ACCIDENTS ID WATER-REACTOR ACCIDENTS; CORE; BEHAVIOR; IODINE AB Recent advances in the understanding of fission product release from fuel under severe accident conditions in light water reactors are reviewed. In addition to the effects of temperature and time at temperature, recent results from in-pile and out-of-pile tests and the accident at Three Mile Island Unit 2 suggest that the effects of fuel morphology such as restructuring of the UO2 microstructure, fuel liquefaction, molten pool formation, debris bed formation, and the effect of fuel chemistry have important influences on fission product release behavior under severe accident conditions. Consideration of these effects is required for complete models of fission product release during severe light water reactor accidents. RP HOBBINS, RR (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,FUELS & MAT UNIT,POB 1625,IDAHO FALLS,ID 83415, USA. NR 57 TC 19 Z9 19 U1 1 U2 7 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 MAR PY 1993 VL 101 IS 3 BP 270 EP 281 PG 12 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KN042 UT WOS:A1993KN04200004 ER PT J AU FONTANA, MH AF FONTANA, MH TI RECENT ADVANCES IN SEVERE ACCIDENT TECHNOLOGY - DIRECT CONTAINMENT HEATING IN ADVANCED LIGHT WATER-REACTORS SO NUCLEAR TECHNOLOGY LA English DT Article; Proceedings Paper CT SESSION ON SEVERE ACCIDENT TECHNOLOGY, AT THE MEETING OF THE AMERICAN NUCLEAR SOC CY JUN, 1991 CL ORLANDO, FL SP AMER NUCL SOC DE NUCLEAR REACTOR SAFETY; SEVERE ACCIDENTS; CONTAINMENT AB The issues affecting high-pressure melt ejection (HPME) and the consequential containment pressurization from direct containment heating (DCH), as they affect advanced light water reactors (ALWRs), specifically advanced pressurized water reactors (APWRs), were reviewed by the U. S. Department of Energy Advanced Reactor Severe Accident Program (ARSAP). Recommendations from ARSAP regarding the design of APWRs to minimize DCH are embodied within the Electric Power Research Institute ALWR Utility Requirements Document, which specifies (a) a large, strong containment; (b) an in-containment refueling water storage tank; (c) a reactor cavity configuration that minimizes energy transport to the containment atmosphere; and (d) a reactor coolant system depressurization system. Experimental and analytical efforts, which have focused on current-generation plants, and analyses for APWRs were reviewed. Although DCH is a subject of continuous research and considerable uncertainties remain, it is the judgment of the ARSAP that reactors complying with the recommended design requirements would have a low probability of early containment failure due to HPME and DCH. RP FONTANA, MH (reprint author), OAK RIDGE NATL LAB,DIV ENGN TECHNOL,POB 2009,OAK RIDGE,TN 37831, USA. NR 50 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 MAR PY 1993 VL 101 IS 3 BP 282 EP 298 PG 17 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KN042 UT WOS:A1993KN04200005 ER PT J AU LYNESS, JN DEDONCKER, E AF LYNESS, JN DEDONCKER, E TI QUADRATURE ERROR EXPANSIONS .2. THE FULL CORNER SINGULARITY SO NUMERISCHE MATHEMATIK LA English DT Article AB We continue the work of Part I, treating in detail the theory of numerical quadrature over a square [0, 1)2 using an m2 copy, Q(m), of a one-point quadrature rule. As before, we determine the nature of an asymptotic expansion for the quadrature error functional Q(m) F - IF in inverse powers of m and related functions, valid for specified classes of the integrand function F. The extreme case treated here is one in which the integrand function has a full-corner algebraic singularity. This has the form x(lambda)y(mu)r(rho)(x, y). Here lambda,mu, and rho need not be integer, and r(rho) is (x2 + y2)rho/2 or some other similar homogeneous function. The error expansion forms the theoretic basis for the use of extrapolation for this kind of integrand. C1 WESTERN MICHIGAN UNIV,DEPT COMP SCI,KALAMAZOO,MI 49008. RP LYNESS, JN (reprint author), ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439, USA. NR 7 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0029-599X J9 NUMER MATH JI Numer. Math. PD MAR PY 1993 VL 64 IS 3 BP 355 EP 370 DI 10.1007/BF01388693 PG 16 WC Mathematics, Applied SC Mathematics GA KR754 UT WOS:A1993KR75400004 ER PT J AU MULVEY, M AHO, JM AF MULVEY, M AHO, JM TI PARASITISM AND MATE COMPETITION - LIVER FLUKES IN WHITE-TAILED DEER SO OIKOS LA English DT Article ID FASCIOLOIDES-MAGNA; POPULATION INTERACTIONS; INFECTIOUS-DISEASES; HOST; STABILITY; BIOLOGY AB As predicted by the parasite burden-mate competition hypothesis (Howard and Minchella), significant relationships were observed between the prevalence and/or intensity of infection by the liver fluke, Fascioloides magna, and traits contributing to male reproductive success in white-tailed deer. Body size and total number of antler points were significantly reduced in heavily infected individuals, particularly for the younger age classes. Infected males lost significantly more weight than uninfected ones during the rut. Losses were more pronounced for males in older age classes. as might he expected if they expend the most energy during the breeding season. RP MULVEY, M (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 31 TC 20 Z9 22 U1 1 U2 7 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0030-1299 J9 OIKOS JI Oikos PD MAR PY 1993 VL 66 IS 2 BP 187 EP 192 DI 10.2307/3544804 PG 6 WC Ecology SC Environmental Sciences & Ecology GA KJ535 UT WOS:A1993KJ53500002 ER PT J AU BALDICK, R AF BALDICK, R TI GENERALIZATION OF BARAHONAS ALGORITHM FOR CASES OF INTEGER NONLINEAR-PROGRAMMING WITH BOX CONSTRAINTS SO OPERATIONS RESEARCH LETTERS LA English DT Article DE INTEGER QUADRATIC PROGRAMMING; SERIES-PARALLEL GRAPHS; POLYNOMIAL ALGORITHMS; PSEUDOPOLYNOMIAL ALGORITHMS; BOX CONSTRAINTS; DYNAMIC PROGRAMMING AB Barahona described a linear time algorithm for a class of 0-1 quadratic programming problems. The algorithm was based on a transformation to a max-cut problem. We describe a linear algorithm that treats a slightly more general problem directly in its original form. We then give a pseudopolynomial algorithm for even more general problems. C1 LAWRENCE BERKELEY LAB,DEPT ELECT & COMP ENGN,BERKELEY,CA 94720. NR 4 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6377 J9 OPER RES LETT JI Oper. Res. Lett. PD MAR PY 1993 VL 13 IS 2 BP 99 EP 105 DI 10.1016/0167-6377(93)90036-G PG 7 WC Operations Research & Management Science SC Operations Research & Management Science GA LA833 UT WOS:A1993LA83300007 ER PT J AU HAGLUND, RF YANG, L MAGRUDER, RH WITTIG, JE BECKER, K ZUHR, RA AF HAGLUND, RF YANG, L MAGRUDER, RH WITTIG, JE BECKER, K ZUHR, RA TI PICOSECOND NONLINEAR OPTICAL-RESPONSE OF A CU-SILICA NANOCLUSTER COMPOSITE SO OPTICS LETTERS LA English DT Article AB We describe the picosecond nonlinear optical response of a metal-dielectric composite made by implanting Cu ions in fused silica. The implanted Cu ions aggregate during implantation to form nanometer-diameter clusters in a dense, thin (approximately 150 nm) layer just beneath the surface of the substrate. The third-order susceptibility chi(3) has an electronic component with a magnitude of the order of 10(-8) esu and is enhanced for laser wavelengths near the surface plasmon resonance of the copper colloids. C1 VANDERBILT UNIV,FREE ELECTRON LASER CTR BIOMED & MAT RES,NASHVILLE,TN 37235. 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 15 TC 214 Z9 215 U1 3 U2 17 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAR 1 PY 1993 VL 18 IS 5 BP 373 EP 375 PG 3 WC Optics SC Optics GA KN040 UT WOS:A1993KN04000017 PM 19802140 ER PT J AU SMITH, DP OLMSTEAD, MM NOLL, BC MAESTRE, MF FISH, RH AF SMITH, DP OLMSTEAD, MM NOLL, BC MAESTRE, MF FISH, RH TI BIOORGANOMETALLIC CHEMISTRY .2. SYNTHESIS AND STRUCTURAL STUDIES OF THE REACTIONS OF A NUCLEOBASE, 1-METHYLCYTOSINE, WITH A (ETA-5-PENTAMETHYLCYCLOPENTADIENYL)RHODIUM AQUA COMPLEX SO ORGANOMETALLICS LA English DT Note ID HETEROAROMATIC NITROGEN LIGANDS; AQUEOUS COORDINATION CHEMISTRY; METALLOCENE ANTITUMOR AGENTS; INTRASTRAND CROSS-LINKING; PENTAMETHYLCYCLOPENTADIENYL-RHODIUM; IRIDIUM COMPLEXES; MECHANISTIC IMPLICATIONS; MOLECULAR-STRUCTURE; CRYSTAL-STRUCTURE; NMR EVIDENCE AB The reactions of a nucleobase, 1-methylcytosine (MC), with a Cp*Rh aqua complex, [(eta5-Cp*)-Rh(H2O)2(OTf)2]x (2), provided two different complexes depending on the solvent media. Complex 3, [(eta5-Cp*)-Rh(eta1(N3)-MC)(eta2(O2,N3)-MC)](OTf)2, was formed when acetone was used as the solvent; however, when complex 3 was recrystallized from water (pH 5. 1) or when water was used as the reaction solvent, complex 4, trans-[(eta5-Cp*)Rh(eta1(N3)-MC)(mu-OH)]2(OTf)2, was isolated as a crystalline solid. The structures of 3 and 4 were verified by H-1 NMR, FAB/MS, elemental analysis, and single-crystal X-ray analysis. The structure of complex 3 showed one MC ligand bound via N3 and the other chelated via N3 and C = O2 (Rh-O2 = 2.251(6) angstrom). Inspection of several bond lengths of complex 4 indicates extensive intramolecular hydrogen bonding of the mu-OH groups with the exocyclic NH2 (HO --- HNH = 1.93(1) angstrom) and the 2-C = O group (OH --- 0 = C = 1.96(1) angstrom). C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. NR 48 TC 31 Z9 31 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 MAR PY 1993 VL 12 IS 3 BP 593 EP 596 DI 10.1021/om00027a001 PG 4 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA KR056 UT WOS:A1993KR05600001 ER PT J AU AMOURI, H VAISSERMANN, J BESACE, Y VOLLHARDT, KPC BALL, GE AF AMOURI, H VAISSERMANN, J BESACE, Y VOLLHARDT, KPC BALL, GE TI 2-DIMENSIONAL H-1-NMR EXSY STUDY OF THE FLUXIONAL BEHAVIOR OF THE NOVEL CARBENIUM ION COMPLEX [FVMO2(CO)4(MU,ETA-2,ETA-3-MECCCH2)][BF4] (FV = FULVALENE) - SYNTHESES, STRUCTURES, AND REACTIVITY SO ORGANOMETALLICS LA English DT Note ID METAL MULTIPLE BONDS; MOLECULAR-STRUCTURE; TETRAFLUOROBORATE; CHEMISTRY; SURFACES AB The title compound [FvMo2(CO)4(mu,eta2,eta3-MeC = CCH2)][BF4] (3) was obtained quantitatively by protonation of [FvMo2(CO)4(mu,eta2,eta2-MeC=CCH2OMe)] (2) in ether solution. In solution 3 was found to be fluxional. The mechanism of exchange was elucidated by 2-D H-1 NMR EXSY (exchange spectroscopy), and the rate constants were determined with k(int) = 35 +/- 4 s-1, DELTAG(double dagger)70-degrees-c = 17.7 +/- 0.4 kcal/mol and k(rot) = 5 +/- 0.5 s-1, DELTAG(double dagger)70-degrees-c = 19.1 +/- 0.4 kcal/mol (int = interconversion; rot = rotation). Consistent with this fluxional behavior the molecular structure of 3, ascertained by X-ray analysis, showed a dynamic disorder in the solid state for the bridged hydrocarbyl ligand as well as for the carbonyl groups. [FvMo2(CO)4(mu,eta2,eta3-MeC=CCH2)][BF4] (3) crystallizes in the monoclinic space group P2(1)/n with Z = 4 and cell dimensions a = 8.546 (3), b = 26.4441 (14), and c = 8.619 (2) A and beta = 105.73 (2)-degrees. The reactivity of this carbenium ion complex with respect to various nucleophiles is reported, including the X-ray molecular structure of the phosphonium derivative [FvMo2(CO)4-(mu,eta2,eta2-MeC=CCH2PPh3] [BF4] (6) obtained from phosphine addition to 3. Compound 6 crystallizes in the monoclinic space group P2(1)/c with Z = 8 and cell dimensions a = 13.243 (4), b = 13.243 (4), and c = 38.461 (4) angstrom and beta = 93.92 (2)-degrees; the structure was refined to R and R(w) values of 4.3 and 5.0%, respectively, using 6606 reflections. C1 LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. RP AMOURI, H (reprint author), UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. RI Ball, Graham/L-6638-2015 OI Ball, Graham/0000-0002-0716-2286 NR 18 TC 32 Z9 33 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAR PY 1993 VL 12 IS 3 BP 605 EP 609 PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA KR056 UT WOS:A1993KR05600005 ER PT J AU BENSON, JW ANGELICI, RJ AF BENSON, JW ANGELICI, RJ TI EQUILIBRIUM AND KINETIC-STUDIES OF SULFUR-COORDINATED THIOPHENES (TH) IN CP(CO)2RU(ETA-1(S)-TH)+ AND CP(CO)(PPH3)RU(ETA-1(S)-TH)+ - MODELS FOR THIOPHENE ADSORPTION ON HYDRODESULFURIZATION CATALYSTS SO ORGANOMETALLICS LA English DT Article ID DEUTERIUM-EXCHANGE; METAL-COMPLEXES; BOND-CLEAVAGE; (ETA-THIOPHENE)RU(ETA-C5H5)+; REACTIVITY; RUTHENIUM; LIGANDS; IRON; CO; CP-STAR-IR(2,5-DIMETHYLTHIOPHENE) AB A series of stable sulfur-bound thiophene complexes, CP(CO)2Ru(eta1(S)-Th)+, where p = eta5-C5H5 and Th = T, 2-MeT, 3-MeT, 2,5-Me2T, Me4T, BT and DBT, are synthesized from the reaction Of CP(CO)2RuCl with Ag+ and thiophenes. Equilibrium constants, K, for the displacement of thiophene (T) by methyl-substituted thiophenes and benzo[b]thiophene (BT), CP(CO)2Ru(eta1(S)-T)+ + Th half arrow right over half CP(CO)2Ru(eta1(S)-Th)+ + T, increase with an increasing number of methyl groups in the thiophene: T (1.00) < 2-MeT (3.30) < 3-MeT (4.76) < 2,5-Me2T (20.7) < BT (47.6) < Me4T (887). First-order rate constants (10(6)k1, s-1) for phosphine substitution of the thiophenes in Cp(CO)2Ru(eta1(S)-Th)+, Cp(CO)2Ru(eta1(S)-Th)+ + PR3 --> CP(CO)2Ru(PR3)+ + Th, by a dissociative mechanism decrease in the following order: 3-MeT (450) > 2-MeT (410) > BT (100) > 2,5-Me2T (23). Rate constants for thiophene dissociation in the analogous Cp-(CO)(PPh3)Ru(eta1(S)-Th)+ complexes decrease in a slightly different order, T (1400) > 2-MeT (220) > 3-MeT (170) > 2,5-Me2T (130) > BT (70) > DBT (17) > Me4T (5.8), due to steric repulsions between the bulky PPh3 and methyl groups in the 2- and 5-positions of the thiophene. In general, methyl groups on the thiophene (Th) increase K and decrease k1, which suggests that the electron-releasing methyl groups enhance thiophene binding to the metal. Thiophene binding on a Co-Mo/Al2O3 HDS catalyst also increases with the number of methyl groups in the thiophene. This trend is consistent with eta1(S) and/or eta5 coordination of thiophenes at metal sites on the catalyst surface. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. NR 57 TC 47 Z9 47 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAR PY 1993 VL 12 IS 3 BP 680 EP 687 DI 10.1021/om00027a018 PG 8 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA KR056 UT WOS:A1993KR05600018 ER PT J AU HALL, SW HUFFMAN, JC MILLER, MM AVENS, LR BURNS, CJ ARNEY, DSJ ENGLAND, AF SATTELBERGER, AP AF HALL, SW HUFFMAN, JC MILLER, MM AVENS, LR BURNS, CJ ARNEY, DSJ ENGLAND, AF SATTELBERGER, AP TI SYNTHESIS AND CHARACTERIZATION OF BIS(PENTAMETHYLCYCLOPENTADIENYL)URANIUM(IV) AND BIS(PENTAMETHYLCYCLOPENTADIENYL)THORIUM(IV) COMPOUNDS CONTAINING THE BIS(TRIMETHYLSILYL)PHOSPHIDE LIGAND SO ORGANOMETALLICS LA English DT Article ID X-RAY STRUCTURE; C-H-ACTIVATION; PHOSPHITE COORDINATION CHEMISTRY; COMPLEXES; URANIUM; BOND; HYDRIDE; REACTIVITY; INSERTION; THORIUM AB A series of bis(pentamethylcyclopentadienyl)uranium and thorium bis(trimethylsilyl)phosphide compounds, Cp*2An(X)[P(SiMe3)2], has been synthesized, where X = Cl [An = U (1a), Th (1b)] or CH3 [An = U (2a), Th (2b)]. Thermal decomposition of 2a,b results in the formation of the metallacycle complexes CP*2An[P(Si(CH3)3)Si(CH3)2CH2] [An = U (3a), Th (3b)], accompanied by the liberation of methane. The compounds la, 2b, and 3a have been characterized by single crystal X-ray structural analysis. Crystal data: for la, space group P2(1)/a, a = 12.025 (2) angstrom, b = 16.821 (4) angstrom, c = 15.156 (3) angstrom, beta = 95.85 (1)-degrees, V = 3049.7 (7) angstrom3, Z = 4, R = 0.059; for 2b, space group P2(1)/c, a = 15.296 (3) angstrom, b = 16.870 (3) angstrom, c = 12.137 (2) angstrom, beta = 96.07 (3)-degrees, V = 3114.1 (10) angstrom3, Z = 4, R = 0.040; for 3a, space group P2(1)/n, a = 8.632 (2) angstrom, b = 18.809 (9) angstrom, c = 19.063 (10) angstrom, beta = 100.66 (4)-degrees, V = 3042 (2) A3, Z = 4, R = 0.073. C1 LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV NUCL MAT TECHNOL,LOS ALAMOS,NM 87545. INDIANA UNIV,CTR MOLEC STRUCT,BLOOMINGTON,IN 47405. COLORADO STATE UNIV,DEPT CHEM,FT COLLINS,CO 80523. NR 37 TC 48 Z9 48 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAR PY 1993 VL 12 IS 3 BP 752 EP 758 DI 10.1021/om00027a027 PG 7 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA KR056 UT WOS:A1993KR05600027 ER PT J AU ZHU, YM SUENAGA, M TAFTO, J AF ZHU, YM SUENAGA, M TAFTO, J TI INTERPRETATION OF TWEED CONTRAST FROM THE YBA2CU3O7-DELTA SYSTEM SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID NI-AL ALLOYS; MICROSTRUCTURES; SCATTERING; NEUTRON; OXYGEN AB The tweed contrast from YBa2Cu3O7-delta alloyed with Fe, Co or Al, observed in the electron microscope, was analysed under different diffraction conditions. The characteristic features of the tweed image were reproduced in calculations of simple models based on the contrast originating from structures with twinning or displacive modulation, stacked on top of each other along the c axis. C1 UNIV OSLO,DEPT PHYS,OSLO 3,NORWAY. RP ZHU, YM (reprint author), BROOKHAVEN NATL LAB,DIV MAT SCI,UPTON,NY 11973, USA. NR 23 TC 15 Z9 15 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD MAR PY 1993 VL 67 IS 3 BP 573 EP 583 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA KW571 UT WOS:A1993KW57100003 ER PT J AU BAKER, I GUHA, S HORTON, JA AF BAKER, I GUHA, S HORTON, JA TI TRANSMISSION ELECTRON-MICROSCOPY INSITU STRAINING OF MULTIPHASE NI-20 AT PERCENT AL-30 AT PERCENT FE SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID NI-AL-FE; ALLOYS; DEFORMATION; BEHAVIOR; NI3AL AB Transmission electron microscopy in situ straining experiments have been performed on the multiphase alloy Ni-20Al-30Fe (where the composition is in atomic per cent). This alloy consists of the B2 (ordered b.c.c.) phase Ni-30Al-20Fe and the phase Ni-12Al-40Fe which is fc.c. with fine L1(2) (ordered f.c.c.) particles. Slip in the B2 phase was by the movement of [100] dislocations occurring either on discrete slip planes or in bands and produced loops as debris behind the gliding dislocations. Slip in the f.c.c. L1(2) phase was by the glide of pairs of (a/2)[110] dislocations and occurred on discrete slip planes. The separation of the (a/2)[110] dislocation pairs increased with increasing distance from the head of the slip band, because of disordering of the L1(2) particles. Pile-ups occurred in both phases at the two-phase interface. Slip propagation was observed to occur across the interfaces both from the B2 phase to the f.c.c. L1(2) phase and vice versa; there was also some evidence that dislocations could be nucleated into both phases from the internal two-phase interfaces. C1 MAT ELECTROCHEM RES CORP,TUCSON,AZ 85706. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP BAKER, I (reprint author), DARTMOUTH COLL,THAYER SCH ENGN,HANOVER,NH 03755, USA. NR 20 TC 8 Z9 8 U1 2 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD MAR PY 1993 VL 67 IS 3 BP 663 EP 674 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA KW571 UT WOS:A1993KW57100008 ER PT J AU FU, CL YE, YY YOO, MH AF FU, CL YE, YY YOO, MH TI THEORETICAL INVESTIGATION OF THE ELASTIC-CONSTANTS AND SHEAR FAULT ENERGIES OF NI3SI APPLICATION TO THE YIELD STRENGTH ANOMALY SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article ID ELECTRONIC-STRUCTURE; L12-ORDERED ALLOYS; SINGLE-CRYSTALS; ORDERED ALLOYS; BEHAVIOR AB The ground-state elastic constants and the shear fault energies (antiphase boundaries and superlattice stacking faults) of Ni3Si are determined from first-principles total-energy calculations within the framework of the local-density-functional theory. Within the context of the cross-slip-pinning model, it is predicted that the anomalous (positive) temperature dependence of yield and flow strengths is not likely to occur in stoichiometric Ni3Si at low temperatures. The strength anomaly reported for Ni3 (Si,Ti) is attributed to the increased driving force for cross-slip, which is probably due to the increased elastic anisotropy (from A almost-equal-to 2.0 to A almost-equal-to 2.8) produced by Ti additions. C1 WUHAN UNIV,DEPT PHYS,WUHAN,PEOPLES R CHINA. RP FU, CL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831, USA. NR 22 TC 10 Z9 10 U1 1 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD MAR PY 1993 VL 67 IS 3 BP 179 EP 185 DI 10.1080/09500839308240927 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA KT979 UT WOS:A1993KT97900007 ER PT J AU ZINGG, SP SIGMAN, ME AF ZINGG, SP SIGMAN, ME TI INFLUENCE OF AN SIO2 CYCLOHEXANE INTERFACE ON THE PHOTOCHEMISTRY OF ANTHRACENE SO PHOTOCHEMISTRY AND PHOTOBIOLOGY LA English DT Article ID SILICA-GEL; SURFACE PHOTOCHEMISTRY; ORGANIC-MOLECULES; QUANTUM YIELDS; PHOTOPHYSICS; NAPHTHALENE; PHOTOLYSIS; POLLUTANTS AB We have investigated the effect of added SiO2 on the photochemistry of anthracene, 1, in cyclohexane. Adsorption of 1 onto the SiO2 surface from cyclohexane follows a Freundlich adsorption isotherm indicating interactions between 1 and the surface over a distribution of adsorption sites. In the absence of oxygen, addition of SiO2 to a cyclohexane solution of 1 leads to a significant increase in the rate of photolysis without a large concomitant change in product identity. The 9,10-photodimer of 1 is the major product under oxygen-deficient conditions. In the presence of oxygen, added SiO2 has dramatic effects on both the photoproduct distribution and the kinetics of photodecomposition. The complicated mixture of oxygenated products formed from photolysis in oxygen-containing slurries is proposed to arise from thermal decomposition of a single primary photoproduct, anthracene-9,10-endoperoxide. The polarity/polarizability of the SiO2/cyclohexane interface is considered to be a major factor influencing the rate of photolysis in the oxygenated SiO2/cyclohexane slurries. C1 OAK RIDGE NATL LAB,DIV CHEM,POB 2008,OAK RIDGE,TN 37831. NR 34 TC 19 Z9 19 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 MAR PY 1993 VL 57 IS 3 BP 453 EP 459 DI 10.1111/j.1751-1097.1993.tb02318.x PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA KT699 UT WOS:A1993KT69900010 ER PT J AU SAFRONOVA, UI TOLSTIKHINA, IY BRUCH, R TANAKA, T HAO, F SCHNEIDER, D AF SAFRONOVA, UI TOLSTIKHINA, IY BRUCH, R TANAKA, T HAO, F SCHNEIDER, D TI SCREENING THEORY FOR TRANSITION ENERGIES OF HIGHLY CHARGED IONS SO PHYSICA SCRIPTA LA English DT Article ID NEON-LIKE IONS; OSCILLATOR-STRENGTHS; SEQUENCE; VALUES AB Many body perturbation theory in conjunction with the screening method has been applied to calculate radiative transition energies of highly charged ions. In the formulas obtained the energy values are averaged over LSJ as a function of the number of electrons distributed in up to 27 subshells taking relativistic energy shifts into account. The introduction of approximate screening parameters for nonrelativistic and relativistic parts of the energy allows us to limit our calculation to first order interelectron interaction only. The derived formulas have been proven to be very useful calculating X-ray spectra of Xe(q+) (q = 44-48) ions interacting with the Cu surface. Comparison is made with other methods such as Hartree-Fock-Pauli (HFP), and relativistic model potential. Computational problems introducing different screening constants and asymptotic limits as well as contributions of the neglected second order interaction are discussed. C1 UNIV NEVADA,RENO,NV 89557. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SAFRONOVA, UI (reprint author), RUSSIAN ACAD SCI,INST SPECT,TROITSK 142092,RUSSIA. RI Tolstikhina, Inga/L-3576-2013 NR 28 TC 25 Z9 29 U1 0 U2 4 PU ROYAL SWEDISH ACAD SCIENCES PI STOCKHOLM PA PUBL DEPT BOX 50005, S-104 05 STOCKHOLM, SWEDEN SN 0281-1847 J9 PHYS SCRIPTA JI Phys. Scr. PD MAR PY 1993 VL 47 IS 3 BP 364 EP 382 DI 10.1088/0031-8949/47/3/007 PG 19 WC Physics, Multidisciplinary SC Physics GA KV129 UT WOS:A1993KV12900007 ER PT J AU CHENG, KT JOHNSON, WR SAPIRSTEIN, J AF CHENG, KT JOHNSON, WR SAPIRSTEIN, J TI LAMB-SHIFT CALCULATIONS FOR NON-COULOMB POTENTIALS SO PHYSICAL REVIEW A LA English DT Article ID PERTURBATION-THEORY CALCULATIONS; RADIATIVE SELF-ENERGY; LITHIUM-LIKE URANIUM; HEAVY-ATOMS; ISOELECTRONIC SEQUENCE; NUCLEAR-POLARIZATION; DIRAC-FOCK; IONS; BINDING; FIELD AB QED effects associated with the electron self-energy and vacuum polarization are calculated in non-Coulomb potentials for atomic states with principal quantum numbers 1 and 2. We consider the Coulomb potential with finite nuclear size incorporated and using the core-Hartree potential, a local version of the Hartree-Fock potential. The calculations are carried out for ions with nuclear charges in the range Z=60-90. For the Coulomb potential with finite nuclear size, substantial discrepancies with an earlier tabulation are found. Radiative corrections are calculated for lithiumlike uranium using the core-Hartree potential and comparison with experiment is made. C1 UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. RP CHENG, KT (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 34 TC 75 Z9 77 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 MAR PY 1993 VL 47 IS 3 BP 1817 EP 1823 DI 10.1103/PhysRevA.47.1817 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000031 ER PT J AU CERJAN, C KOSLOFF, R AF CERJAN, C KOSLOFF, R TI EFFICIENT VARIABLE TIME-STEPPING SCHEME FOR INTENSE FIELD-ATOM INTERACTIONS SO PHYSICAL REVIEW A LA English DT Article ID MULTIPHOTON IONIZATION; MODEL AB The recently developed Residuum method [Tal-Ezer, Kosloff, and Cerjan, J. Comput. Phys. 100, 179 (1992)], a Krylov subspace technique with variable time-step integration for the solution of the time-dependent Schrodinger equation, is applied to the frequently used soft Coulomb potential in an intense laser field. This one-dimensional potential has asymptotic Coulomb dependence with a ''softened'' singularity at the origin; thus it models more realistic phenomena. Two of the more important quantities usually calculated in this idealized system are the photoelectron and harmonic photon generation spectra. These quantities are shown to be sensitive to the choice of a numerical integration scheme: some spectral features are incorrectly calculated or missing altogether. Furthermore, the Residuum method allows much larger grid spacings for equivalent or higher accuracy in addition to the advantages of variable time stepping. Finally, it is demonstrated that enhanced high-order harmonic generation accompanies intense field stabilization and that preparation of the atom in an intermediate Rydberg state leads to stabilization at much lower laser intensity. C1 HEBREW UNIV JERUSALEM,FRITZ HABER RES CTR MOLEC DYNAM,IL-91904 JERUSALEM,ISRAEL. RP CERJAN, C (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Kosloff, Ronnie/D-2388-2013 OI Kosloff, Ronnie/0000-0001-6201-2523 NR 16 TC 21 Z9 21 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 MAR PY 1993 VL 47 IS 3 BP 1852 EP 1860 DI 10.1103/PhysRevA.47.1852 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000035 ER PT J AU CHEN, MH REED, KJ AF CHEN, MH REED, KJ TI INDIRECT CONTRIBUTIONS TO ELECTRON-IMPACT IONIZATION OF KR-24+, KR-25+, AND XE-43+ SO PHYSICAL REVIEW A LA English DT Article ID EXCITATION-AUTOIONIZATION; X-RAY; AUGER; IONS; FE-15+ AB Electron-impact ionization cross sections have been calculated for Kr24+ and Kr25+. The contributions of excitation-autoionization and resonant excitation double autoionization (REDA) were included in addition to the cross sections for direct ionization of a 3s electron. For Xe43+ the REDA contributions were extended to two times the ionization threshold. The calculations were performed using the relativistic distorted-wave and the multiconfiguration Dirac-Fock methods. For Kr25+ the indirect processes enhance the ionization cross section by a factor of 4. For Kr24+ the total cross section is about 3.5 times the direct-ionization cross section. The REDA process produces numerous strong resonances and contributes about 20% to the average ionization cross section for Kr24+ and Kr25+ and 15% to the average ionization cross section for Xe43+. RP CHEN, MH (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV HIGH TEMP PHYS,LIVERMORE,CA 94550, USA. NR 17 TC 21 Z9 22 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 MAR PY 1993 VL 47 IS 3 BP 1874 EP 1877 DI 10.1103/PhysRevA.47.1874 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000038 ER PT J AU CELIBERTO, R RESCIGNO, TN AF CELIBERTO, R RESCIGNO, TN TI DEPENDENCE OF ELECTRON-IMPACT EXCITATION CROSS-SECTIONS ON THE INITIAL VIBRATIONAL QUANTUM NUMBER IN H-2 AND D2 MOLECULES - X(1)SIGMA-G+-]B(1)SIGMA-U+ AND X(1)SIGMA-G+-]C(1)PI-U TRANSITIONS SO PHYSICAL REVIEW A LA English DT Article ID DIRECT DISSOCIATION PROCESSES; ENERGY-DISTRIBUTION FUNCTIONS; HIGHER SINGLET-STATES; N = 1-5; EXCITED H-2-MOLECULES; COLLISIONAL EXCITATION; PARAMETER METHOD; HYDROGEN; RADIATION; EMISSIONS AB Electron-impact excitation cross sections have been calculated using the impact-parameter method for X1SIGMA(g)+-->B1SIGMA(u)+ and X1SIGMA(g)+-->C1PI(u) transitions for both H-2 and D2 molecules as a function of incident energy and of vibrational quantum number v(i). The results show that the cross sections initially increase monotonically with increasing v(i) and follow the opposite trend for higher v(i) values. C1 CNR,CTR STUDI CHIM PLASMI,I-70126 BARI,ITALY. UNIV BARI,DIPARTIMENTO CHIM,I-70126 BARI,ITALY. RP CELIBERTO, R (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 34 TC 50 Z9 50 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 MAR PY 1993 VL 47 IS 3 BP 1939 EP 1945 DI 10.1103/PhysRevA.47.1939 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000044 ER PT J AU SCHAPHORST, SJ KODRE, AF RUSCHEINSKI, J CRASEMANN, B ABERG, T TULKKI, J CHEN, MH AZUMA, Y BROWN, GS AF SCHAPHORST, SJ KODRE, AF RUSCHEINSKI, J CRASEMANN, B ABERG, T TULKKI, J CHEN, MH AZUMA, Y BROWN, GS TI MULTIELECTRON INNER-SHELL PHOTOEXCITATION IN ABSORPTION-SPECTRA OF KR - THEORY AND EXPERIMENT SO PHYSICAL REVIEW A LA English DT Article ID X-RAY ABSORPTION; DOUBLE-VACANCY EXCITATIONS; POST-COLLISION INTERACTION; ELECTRON BINDING-ENERGIES; L-ATOMIC LEVELS; ONE-PHOTON; CROSS-SECTION; PHOTOIONIZATION THRESHOLD; SYNCHROTRON RADIATION; BREIT INTERACTION AB The probability of Kr 1s photoionization alone and accompanied by 4p, 3d, 3p, 2s, and 2s4p excitations has been calculated as a function of photon energy in the vicinity of the respective thresholds; pertinent energies have been computed including relativistic, quantum-electrodynamic, and relaxation effects. Sharp features from two-electron excitations are expected in absorption spectra only if at least one of the electrons undergoes a transition to a bound state; this becomes less probable in inner shells. An absorption-spectrometry experiment on Kr has been performed with synchrotron radiation; results generally confirm the predictions but also point toward refinements that are required in the theory and the need for improvements in techniques and synchrotron-radiation sources. C1 UNIV OREGON, DEPT PHYS, EUGENE, OR 97403 USA. LAWRENCE LIVERMORE NATL LAB, DIV HIGH TEMP PHYS, LIVERMORE, CA 94550 USA. HELSINKI UNIV TECHNOL, PHYS LAB, SF-02150 ESPOO, FINLAND. ARGONNE NATL LAB, DIV PHYS, ARGONNE, IL 60439 USA. UNIV CALIF SANTA CRUZ, DEPT PHYS, SANTA CRUZ, CA 95064 USA. UNIV LJUBLJANA, J STEFAN INST, 61111 LJUBLJANA, SLOVENIA. NR 112 TC 96 Z9 96 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD MAR PY 1993 VL 47 IS 3 BP 1953 EP 1966 DI 10.1103/PhysRevA.47.1953 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000046 ER PT J AU KNAPP, DA MARRS, RE SCHNEIDER, MB CHEN, MH LEVINE, MA LEE, P AF KNAPP, DA MARRS, RE SCHNEIDER, MB CHEN, MH LEVINE, MA LEE, P TI DIELECTRONIC RECOMBINATION OF HELIUM-LIKE IONS SO PHYSICAL REVIEW A LA English DT Article ID HIGHLY CHARGED IONS; CROSS-SECTIONS AB We have measured DELTAn greater-than-or-equal-to 1 dielectronic-recombination cross sections for the heliumlike ions Ni26+, Mo40+, and Ba54+. We observed the x rays emitted during dielectronic recombination by ions in an electron-beam ion trap and obtained cross sections from a calibration based upon radiative recombination. The results generally agree well with theoretical predictions. RP KNAPP, DA (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550, USA. NR 12 TC 67 Z9 70 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR PY 1993 VL 47 IS 3 BP 2039 EP 2046 DI 10.1103/PhysRevA.47.2039 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000053 ER PT J AU FEINBERG, B GOULD, H MEYERHOF, WE BELKACEM, A HULSKOTTER, HP ALONSO, JR BLUMENFELD, L DILLARD, E GUARDALA, N KREBS, GF MCMAHAN, MA RHOADESBROWN, MJ RUDE, BS SCHWEPPE, J SPOONER, DW STREET, K THIEBERGER, P WEGNER, H AF FEINBERG, B GOULD, H MEYERHOF, WE BELKACEM, A HULSKOTTER, HP ALONSO, JR BLUMENFELD, L DILLARD, E GUARDALA, N KREBS, GF MCMAHAN, MA RHOADESBROWN, MJ RUDE, BS SCHWEPPE, J SPOONER, DW STREET, K THIEBERGER, P WEGNER, H TI RELATIVISTIC ELECTRON-IMPACT AND PROTON-IMPACT IONIZATION OF HIGHLY STRIPPED HEAVY-IONS DETERMINED FROM PROJECTILE-ELECTRON LOSS IN H2 AND HE SO PHYSICAL REVIEW A LA English DT Note ID ATOMIC IONS; ENERGY-LOSS AB We show that electron- and proton-impact ionization cross sections for highly stripped heavy ions can be deduced from the projectile-electron-loss cross sections determined by collisions with a H-2 and a He target. We measure electron loss for 100- and 380-MeV/u Au52+, and 405-MeV/u U86+ in H-2 and He targets, and extract the electron- and proton-impact ionization cross sections. Our results are compared with calculations and with channeling experiments. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. BERKELEY HIGH SCH,BERKELEY,CA 94704. BROOKHAVEN NATL LAB,DEPT ACCELERATOR DEV,UPTON,NY 11973. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP FEINBERG, B (reprint author), LAWRENCE BERKELEY LAB,DIV ACCELERATOR & FUS RES,MS 51-208,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR PY 1993 VL 47 IS 3 BP 2370 EP 2373 DI 10.1103/PhysRevA.47.2370 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000090 ER PT J AU KIMURA, M AF KIMURA, M TI DEPARTURE FROM VELOCITY PROPORTIONALITY IN LOW-ENERGY ELECTRONIC STOPPING SO PHYSICAL REVIEW A LA English DT Note ID CHARGE-TRANSFER; COLLISIONS; EXCITATION AB A recent paper by Golser and Semrad [Phys. Rev. Lett. 66, 1831 (1991)] showed a departure from velocity proportionality in their energy-loss measurement of a hydrogen projectile in the gas below 20 keV. We point out that their result is a consequence of complex collision dynamics that is common in the molecular regime and has been known for some time among atomic physicists. The observation is well reproduced by a compilation of published stopping cross sections. C1 RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RP KIMURA, M (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 10 TC 7 Z9 7 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 MAR PY 1993 VL 47 IS 3 BP 2393 EP 2394 DI 10.1103/PhysRevA.47.2393 PG 2 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000097 ER PT J AU DEWITT, DR SCHNEIDER, D CHEN, MH SCHNEIDER, MB CHURCH, D WEINBERG, G SAKURAI, M AF DEWITT, DR SCHNEIDER, D CHEN, MH SCHNEIDER, MB CHURCH, D WEINBERG, G SAKURAI, M TI DIELECTRONIC RECOMBINATION CROSS-SECTIONS OF FLUORINELIKE XENON SO PHYSICAL REVIEW A LA English DT Note ID ELECTRON-IMPACT EXCITATION; HIGHLY CHARGED IONS; ARGON; OXYGEN; TRAP AB Measurements of relative dielectronic recombination (DR) cross sections for fluorinelike xenon (Xe45+) are presented. Recombination takes place in an electron-beam ion trap, where decay rates are obtained as the ions recombine with beam electrons. Experimental data are obtained by counting the number of ions that remain, as a function of time, following the recombination period. The counting is accomplished through the use of an ion-extraction system. An ultralow beam current, 2 mA, was used to obtain an energy resolution of 10.6 eV full width at half maximum. The experimentally measured resonances are compared to convolved theoretical DR resonance strengths. The agreement with theory is excellent. C1 TEXAS A&M UNIV SYST,COLL STN,TX 77843. NATL INST FUS SCI,NAGOYA 46401,JAPAN. RP DEWITT, DR (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 17 TC 18 Z9 18 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR PY 1993 VL 47 IS 3 BP R1597 EP R1600 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV980 UT WOS:A1993KV98000003 ER PT J AU GONZALEZ, R CHEN, Y BALLESTEROS, C LIU, HL WILLIAMS, GP ROSENBLATT, GH WILLIAMS, RT GELLERMANN, W AF GONZALEZ, R CHEN, Y BALLESTEROS, C LIU, HL WILLIAMS, GP ROSENBLATT, GH WILLIAMS, RT GELLERMANN, W TI LUMINESCENCE PROPERTIES OF DEFORMED CAO CRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID ALKALINE-EARTH OXIDES; OXYGEN VACANCIES; F+ CENTERS; MGO AB In deformed CaO crystals, the predominant optical-absorption band at 270 nm and the corresponding luminescence band at 450 nm have been investigated. The absorption coefficient increases linearly with deformation up to approximately 5% whereas the luminescence intensity saturates earlier. Thermal annealing indicates that appreciable decrease in the absorption begins at approximately 600 K. In contrast, the luminescence intensity diminishes very rapidly at temperatures not much above room temperature. Time-resolved luminescence indicates that the 450-nm band is composed of two bands: a 475-nm band with lifetimes of. < 3 ns and approximately 10 mus, and a 440-nm band with a lifetime of approximately 1 ms at room temperature. In a test for laser action no optical gain was observed in a deformed CaO crystal. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV UTAH,DEPT PHYS,SALT LAKE CITY,UT 84112. WAKE FOREST UNIV,DEPT PHYS,WINSTON SALEM,NC 27109. RP GONZALEZ, R (reprint author), UNIV CARLOS 3,ESCUELA POLITECN SUPER,DEPT INGN,E-28913 LEGANES MADRID,SPAIN. OI BALLESTEROS, CARMEN INES/0000-0002-8983-4751 NR 19 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1993 VL 47 IS 9 BP 4910 EP 4915 DI 10.1103/PhysRevB.47.4910 PG 6 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900013 ER PT J AU SCHWARTZ, LM WILKINSON, DJ BOLSTERLI, M HAMMOND, P AF SCHWARTZ, LM WILKINSON, DJ BOLSTERLI, M HAMMOND, P TI PARTICLE FILTRATION IN CONSOLIDATED GRANULAR SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID POROUS-MEDIA; GRAIN CONSOLIDATION; CONTINUUM-SYSTEMS; TRANSPORT; PERMEABILITY; PACKING; SPHERES AB Grain-packing algorithms are used to model the mechanical trapping of dilute suspensions of particles by consolidated granular media. We study the distribution of filtrate particles, the formation of a damage zone (internal filter cake), and the transport properties of the host-filter-cake composite. At the early stages of filtration, our simulations suggest simple relationships between the structure of the internal filter cake and the characteristics of the underlying host matrix. These relationships are then used to describe the dynamics of the filtration process. Depending on the grain size and porosity of the host matrix, calculated filtration rates may either be greater than (spurt loss) or less than (due to internal clogging) those predicted by standard surface-filtration models. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. SCHLUMBERGER CAMBRIDGE RES LTD,CAMBRIDGE CB3 OEL,ENGLAND. RP SCHWARTZ, LM (reprint author), SCHLUMBERGER DOLL RES CTR,RIDGEFIELD,CT 06877, USA. OI Hammond, Paul/0000-0002-7266-3087 NR 14 TC 15 Z9 15 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 MAR 1 PY 1993 VL 47 IS 9 BP 4953 EP 4958 DI 10.1103/PhysRevB.47.4953 PG 6 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900017 ER PT J AU BELANGER, DP YOSHIZAWA, H AF BELANGER, DP YOSHIZAWA, H TI NEUTRON-SCATTERING STUDY OF THE RANDOM-EXCHANGE ISING SYSTEM FEXZN1-XF2 NEAR THE PERCOLATION-THRESHOLD SO PHYSICAL REVIEW B LA English DT Article ID REENTRANT-SPIN-GLASS; RANDOM-FIELD SYSTEMS; N-VECTOR MODEL; CRITICAL-BEHAVIOR; CRITICAL-DYNAMICS; 3 DIMENSIONS; MIXED PHASE; FEXMN1-XTIO3; ANTIFERROMAGNETS; FE0.31ZN0.69F2 AB Neutron-scattering measurements at H=0 in the dilute Ising antiferromagnet FexZn1-xF2, with x=0.25 and x=0.27, both concentrations above the percolation threshold x(p)=0.24, show no long-range order upon cooling to T=2 K. For temperatures above the equilibrium boundary T(eq)(H), measured previously in magnetization studies of FexZn1-xF2 for x=0.25, the scattering line shapes at H=0 are adequately described by Lorentzian functions, whereas below they are better described by the sum of a Lorentzian and a squared Lorentzian. The linewidths above T(eq)(0) decrease with T as if approaching a phase transition, at T almost-equal-to 12 K for x=0.27 and lower for x=0.25, but become limited at T(eq)(0). We will discuss these results in the context of other observations of spin-glass-like behavior observed in FexZn1-xF2 for 0.25 less-than-or-equal-to x less-than-or-equal-to 0.31. Comparison is made to an isomorphic, weakly anisotropic antiferromagnet and to Ising antiferromagnets with competing interactions. C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV TOKYO,INST SOLID STATE PHYS,TOKYO 106,JAPAN. RP BELANGER, DP (reprint author), UNIV CALIF SANTA CRUZ,DEPT PHYS,SANTA CRUZ,CA 95064, USA. NR 55 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 MAR 1 PY 1993 VL 47 IS 9 BP 5051 EP 5058 DI 10.1103/PhysRevB.47.5051 PG 8 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900031 ER PT J AU PECHARSKY, VK GSCHNEIDNER, KA FORT, D AF PECHARSKY, VK GSCHNEIDNER, KA FORT, D TI ZERO-FIELD AND MAGNETIC-FIELD LOW-TEMPERATURE HEAT-CAPACITY OF SOLID-STATE ELECTROTRANSPORT-PURIFIED ERBIUM SO PHYSICAL REVIEW B LA English DT Article ID GADOLINIUM; 0.5-K; ER AB Zero-field (1.5-80 K) and high magnetic-field (1.5-20 K) low-temperature heat-capacity measurements have been carried out on 99.97 at. % (99.996 wt %) pure polycrystalline erbium. The electronic specific-heat coefficient (in zero field) was found to be 8.7+/-0. 1 mJ/mol K2 and the Debye temperature to be 176.9+/-0.4 K. The ''ferromagnetic'' transition of erbium around 19 K exhibits a tremendously large and sharp heat-capacity maximum of 169 J/mol K. Five other heat-capacity anomalies at 25.1, 27.5, 42, 48.9, and 51.4 K were observed. The 51.4-K peak is associated with antiferromagnetic ordering in the basal plane, and the other four anomalies are associated with spin-slip transitions between two different commensurate antiferromagnetic structures. An external magnetic field shifts the ferromagnetic heat-capacity peak toward higher temperatures with a remarkable suppression and broadening of the maximum, and reduces the total heat capacity below the magnetic ordering maximum for temperatures down to about 5 K. At lower temperatures, the high-magnetic field (H > 5 T) increases the sample heat capacity due to an increase in both the Er-167 hyperfine coupling and electronic contributions. The effective magnetic field at the nucleus increases from 7.2 MOe at H = 0 to 10.3 MOe at H = 9.85 T. The electronic specific constant (density of state at the Fermi level) exhibits a 15 % increase at H approximately 2 T due to a spin reorientation of the basal plane moments. This change is also evident in the magnetic contribution to the heat capacity. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV BIRMINGHAM,SCH MET & MAT,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. NR 29 TC 19 Z9 19 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 MAR 1 PY 1993 VL 47 IS 9 BP 5063 EP 5071 DI 10.1103/PhysRevB.47.5063 PG 9 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900033 ER PT J AU ROBINSON, RA LYNN, JW NUNEZ, V BUSCHOW, KHJ NAKOTTE, H LAWSON, AC AF ROBINSON, RA LYNN, JW NUNEZ, V BUSCHOW, KHJ NAKOTTE, H LAWSON, AC TI CRYSTALLOGRAPHIC AND MAGNETIC-PROPERTIES OF UAUSN SO PHYSICAL REVIEW B LA English DT Article ID IONS AB The uranium intermetallic compound UAuSn has been studied by means of neutron powder diffraction. It crystallizes in the CaIn2 structure type, with space group P6(3)/mmc, in agreement with previous x-ray work. Below 37 K, it exhibits long-range antiferromagnetic order, in a double-sized orthohexagonal magnetic unit cell. At the lowest temperature measured, the uranium moment is 1.10mu(B). The magnetic structure is collinear with moments parallel to the orthorhombic b axis and the magnetic space group is C(p)m'cm'. We discuss the Au/Sn disorder in terms of metallic radii and discuss he consequences of this symmetry on the collinearity of the magnetic structure. These results are compared with work on the isostructural compounds UPdSn and UCuSn. C1 NATL INST STAND & TECHNOL,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899. PHILIPS RES LABS,5600 JA EINDHOVEN,NETHERLANDS. UNIV AMSTERDAM,VANDERWAALS ZEEMAN LAB,1018 XE AMSTERDAM,NETHERLANDS. RP ROBINSON, RA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 17 TC 13 Z9 13 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 MAR 1 PY 1993 VL 47 IS 9 BP 5090 EP 5094 DI 10.1103/PhysRevB.47.5090 PG 5 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900036 ER PT J AU SENGUPTA, S SHI, DL WANG, ZN SMITH, ME MCGINN, PJ AF SENGUPTA, S SHI, DL WANG, ZN SMITH, ME MCGINN, PJ TI U-J RELATIONSHIP IN TYPE-II SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; BI2SR2CACU2OX SINGLE-CRYSTAL; CREEP ACTIVATION-ENERGY; CU-O CRYSTAL; FLUX-CREEP; MAGNETIC-RELAXATION; FIELD-DEPENDENCE; CURRENT-DENSITY; TEMPERATURE; IRREVERSIBILITY AB The Anderson-Kim model has been modified in terms of the U-j relationship for high-T(c) superconductors. We have obtained U-j curves by an approach based on the temperature dependence of j(c). Our results are consistent with the physical picture of flux creep. Our data is obtained from magnetic-relaxation experiments on YBa2Cu3Ox single crystals with the direction of the field parallel to the c axis. The decay of magnetization was studied for both increasing and decreasing fields, used to obtain the current density. C1 UNIV NOTRE DAME,DEPT ELECT ENGN,NOTRE DAME,IN 46556. RP SENGUPTA, S (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 27 TC 27 Z9 27 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 MAR 1 PY 1993 VL 47 IS 9 BP 5165 EP 5169 DI 10.1103/PhysRevB.47.5165 PG 5 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900045 ER PT J AU KAPLAN, SG NOH, TW SIEVERS, AJ CHEONG, SW FISK, Z AF KAPLAN, SG NOH, TW SIEVERS, AJ CHEONG, SW FISK, Z TI FAR-INFRARED ANTIFERROMAGNETIC-RESONANCE IN GD2CUO4 SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTIVITY; TH; ND; SM; EU; GD AB The infrared-active antiferromagnetic resonance modes in Gd2CuO4 have been measured infrared transmission through single-crystal and polycrystalline samples at fields from 0 to 9 T and temperatures from 1.4 to 35 K. The observed spectra are compared to the predictions of three different spin-wave models for Gd2CuO4. A model including four Gd sublattices without coupling to the Cu spins cannot produce a mode at high enough frequency to match the data, while a two Gd and two Cu sublattice model fails to predict the correct temperature dependence. It is found that to explain the temperature dependence of the observed spectrum, it is necessary to use a model with four Gd and two Cu sublattices, in which a triangular-to-antiparallel transition in the Gd spins occurs near the Gd Neel temperature of 6.5 K. In this model, the Cu spins combine to produce an effective field of about 0.13 T at the Gd sites, which polarizes the Gd spins into ''captive sublattices'' at higher temperature. The observed mode strengths and those predicted by the model are both found to be in good agreement with the known dc susceptibility. C1 CORNELL UNIV,CTR MAT SCI,ITHACA,NY 14853. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP KAPLAN, SG (reprint author), CORNELL UNIV,ATOM & SOLID STATE PHYS LAB,ITHACA,NY 14853, USA. RI Noh, Tae Won /K-9405-2013 NR 26 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1993 VL 47 IS 9 BP 5300 EP 5314 DI 10.1103/PhysRevB.47.5300 PG 15 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900059 ER PT J AU STERNLIEB, BJ SHIRANE, G TRANQUADA, JM SATO, M SHAMOTO, S AF STERNLIEB, BJ SHIRANE, G TRANQUADA, JM SATO, M SHAMOTO, S TI TEMPERATURE-DEPENDENCE OF THE DYNAMIC SUSCEPTIBILITY CHI''(OMEGA) IN SUPERCONDUCTING YBA2CU3O6.6(TC=53-K) SO PHYSICAL REVIEW B LA English DT Article ID NEUTRON-SCATTERING; MAGNETIC CORRELATIONS; SPIN FLUCTUATIONS; NORMAL-STATE; ENERGY-GAP; YBA2CU3O6+X; CRYSTAL; CU AB Temperature-dependent neutron-scattering measurements of the dynamic susceptibility chi''(omega) in single-crystal YBa2Cu3O6.6 (T(c) = 53 K) are reported. At high temperatures (T greater than or similar to 100 K) a universal dependence of chi''(omega) on the ratio omega/T has been observed. A spin pseudogap omega(g) congruent-to 10 meV results in a breakdown in this behavior at temperatures well above T(c). Below approximately 40 K the scattering intensities at energy transfers of DELTAE = 5 and 8 meV demonstrate a surprising recovery with decreasing temperature. The behavior of chi''(omega) over the range of energies (3-16 meV) and temperatures (1.5-300 K) studied presents a strong constraint on theoretical descriptions of YBa2Cu3O6+x. C1 NAGOYA UNIV,DEPT PHYS,NAGOYA 46401,JAPAN. RP STERNLIEB, BJ (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Tranquada, John/A-9832-2009 OI Tranquada, John/0000-0003-4984-8857 NR 21 TC 111 Z9 111 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 MAR 1 PY 1993 VL 47 IS 9 BP 5320 EP 5324 DI 10.1103/PhysRevB.47.5320 PG 5 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900061 ER PT J AU WANG, ZL GOYAL, A KROEGER, DM AF WANG, ZL GOYAL, A KROEGER, DM TI STRUCTURAL AND CHEMICAL DISORDER NEAR THE Y2BACUO5/YBA2CU3O7-DELTA INTERFACE AND ITS POSSIBLE RELATION TO THE FLUX-PINNING BEHAVIOR IN MELT-TEXTURED YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Article ID SINGLE-CRYSTALS; SUPERCONDUCTING YBA2CU3O7; OXIDE SUPERCONDUCTORS; IRREVERSIBILITY LINE; CRITICAL CURRENTS; TWIN BOUNDARIES; CURRENT-DENSITY; HIGH-JC; IRRADIATION; DEFECTS AB Transmission-electron microscopy and energy-dispersive x-ray spectroscopy were used to study the microstructure of the YBa2Cu3O7-delta (1:2:3) region adjacent to the Y2BaCuO5/YBa2Cu3O7-delta (2:1:1/1:2:3) interface. It is found that there exists a high local density of stacking faults in 1:2:3, near the 2:1:1/1:2:3 interfaces. The stacking faults lie parallel to the (001) basal plane and are inhomogeneously distributed around the 2:1:1 particles. They tend to be disk shaped with diameters ranging from a few to approximately 30 nm. Calculations made using simple energy considerations suggest that these stacking faults may act as effective flux pinners for magnetic fields directed both parallel and perpendicular to the basal plane. They may account for the observed increase of J(c) with volume fraction of 2:1:1 and also explain the angular dependence of transport J(c) in melt-processed 1:2:3. An unusual tendency for the formation of facets on the incoherent, randomly oriented 2:1:1 particles parallel to the {001}-type planes in the 1:2:3 matrix was also observed. Microanalysis of the 1:2:3 region around the 2:1:1 particles, which contain few or no stacking faults, consistently shows an enrichment of Y and a corresponding depletion in Ba concentration. Such cation nonstoichiometry may result in the formation of numerous point defects, which could also result in pinning. The presence of ledges on some facets at the 2:1:1/1:2:3 interfaces and the observed compositional nonstoichiometry in the 1:2:3 phase in the vicinity of these interfaces suggest that 2:1:1 particles continue to change in size after entrapment in 1:2:3. The observed compositional variation is consistent with dissolution of trapped 2:1:1. Such diffusion effects and stresses due to he thermal and elastic mismatch between 2:1:1 and 1:2:3 provide mechanisms for generating the oberved defects aroung the 2:1:1 particles in the 1:2:3 matrix. RP WANG, ZL (reprint author), OAK RIDGE NATL LAB,DIV MET & CERAM,POB 2008,OAK RIDGE,TN 37831, USA. RI Wang, Zhong Lin/E-2176-2011 OI Wang, Zhong Lin/0000-0002-5530-0380 NR 47 TC 119 Z9 122 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1993 VL 47 IS 9 BP 5373 EP 5382 DI 10.1103/PhysRevB.47.5373 PG 10 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900067 ER PT J AU SENGUPTA, S SHI, DL WANG, ZN SMITH, ME SALEMSUGUI, S MCGINN, PJ AF SENGUPTA, S SHI, DL WANG, ZN SMITH, ME SALEMSUGUI, S MCGINN, PJ TI MAGNETIC-RELAXATION AND INTRINSIC PINNING IN A SINGLE-CRYSTAL OF BI2SR2CACU2OX SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; HIGH-TEMPERATURE SUPERCONDUCTORS; CRITICAL CURRENT-DENSITY; CREEP ACTIVATION-ENERGY; FLUX-CREEP; DEPENDENCE; FIELD; YBA2CU3O7-X; STATE AB Magnetic-relaxation experiments were performed on Bi2Sr2CaCu2Ox Single crystals with the direction of the field parallel to the ab plane. Based on the relaxation data, we have obtained relationships between the activation energy U and the current density j by an approach we developed previously. We found that the activation energy has a logarithmic dependence on j in a wide regime of driving force. It has been reported that CuO2 planes in high-T(c) superconductors can act as strong intrinsic pinning centers and that the relation U approximately U0ln(j(c)/j) may describe such a pinning mechanism. Our experimental results have shown good agreement with such a physical model of intrinsic flux pinning. C1 UNIV ESTADUAL CAMPINAS,INST FIS,BR-13081 CAMPINAS,SP,BRAZIL. UNIV NOTRE DAME,DEPT ELECT ENGN,NOTRE DAME,IN 46556. RP SENGUPTA, S (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Inst. of Physics, Gleb Wataghin/A-9780-2017 NR 30 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1993 VL 47 IS 9 BP 5414 EP 5418 DI 10.1103/PhysRevB.47.5414 PG 5 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900071 ER PT J AU BALAKRISHNAN, R BISHOP, AR DANDOLOFF, R AF BALAKRISHNAN, R BISHOP, AR DANDOLOFF, R TI GAUGE FREEDOM, ANHOLONOMY, AND HOPF INDEX OF A 3-DIMENSIONAL UNIT VECTOR FIELD SO PHYSICAL REVIEW B LA English DT Note ID TOPOLOGICAL TERMS; SIGMA-MODEL; SPIN; PHASE; ANTIFERROMAGNETS; FERROMAGNETS AB By identifying a continuous, three-dimensional classical unit vector field with the tangent to a space curve, we show that the associated global anholonomy is related to certain topological quantities, which depend on the dimensionality d of the field. In three dimensions (3D) there exists a conserved topological current. The three components of the corresponding vector potential are the torsions associated with three space curves. Also, there exist two types of global anholonomy: one of them always vanishes identically while the other takes the form of the Hopf term. This is a consequence of the existence of an inherent gauge freedom in the space-curve formalism, which plays no role in 1D and 2D, but becomes important in 3D. An application to classical spin systems is briefly discussed. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. NR 26 TC 11 Z9 11 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 MAR 1 PY 1993 VL 47 IS 9 BP 5438 EP 5441 DI 10.1103/PhysRevB.47.5438 PG 4 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900076 ER PT J AU GRONBECHJENSEN, N AF GRONBECHJENSEN, N TI COUPLING OF MICROWAVES TO FLUXON MOTION IN JOSEPHSON-JUNCTIONS SO PHYSICAL REVIEW B LA English DT Note ID PHASE-LOCKING; TUNNEL-JUNCTIONS; OSCILLATIONS AB Phase locking of fluxon motion in a long Josephson junction is investigated theoretically for microwave coupling through the boundaries of the system. We demonstrate that the wave properties of the fluxon motion during reflection are crucial for predicting the size of the locking range. Analytical results are compared to direct numerical simulations of the sine-Gordon model and excellent agreement is found. RP GRONBECHJENSEN, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 13 TC 20 Z9 20 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 MAR 1 PY 1993 VL 47 IS 9 BP 5504 EP 5507 DI 10.1103/PhysRevB.47.5504 PG 4 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900094 ER PT J AU XIONG, P XIAO, G WU, XD AF XIONG, P XIAO, G WU, XD TI HALL ANGLE IN YBA2CU3O7-DELTA EPITAXIAL-FILMS - COMPARISON BETWEEN OXYGEN REDUCTION AND PR DOPING SO PHYSICAL REVIEW B LA English DT Note ID LIQUID AB We have investigated the temperature dependence of the Hall angle in oxygen-deficient and Pr-doped YBa2Cu3O7-delta epitaxial films. The cotangent of the Hall angle follows a universal T2 dependence in all superconducting samples, i.e., cottheta(H)=alphaT2+C. In the YBa2Cu3O7-delta SYStem the slope a increases monotonically with delta while the quantity C remains almost constant. Most important, there exists a linear correlation between T(c) and alpha. In the PrxY1-xBa2Cu3O7 series both a and C increase with x. Combined with previous studies we conclude that the changes of alpha and C are related to two distinct mechanisms for suppressing superconductivity. While the increase of C corresponds to a reduction of mobility, the change of a reflects the variation in true carrier density. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP BROWN UNIV, DEPT PHYS, PROVIDENCE, RI 02912 USA. RI Xiao, Gang/G-5691-2011 NR 16 TC 59 Z9 59 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1993 VL 47 IS 9 BP 5516 EP 5519 DI 10.1103/PhysRevB.47.5516 PG 4 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900097 ER PT J AU PENN, DR COHEN, ML CRESPI, VH AF PENN, DR COHEN, ML CRESPI, VH TI INVERSE ISOTOPE EFFECTS AND MODELS FOR HIGH-TC SUPERCONDUCTIVITY SO PHYSICAL REVIEW B LA English DT Note ID MECHANISMS AB A model for high-temperature superconductivity with a mass-independent electronic mechanism in conjunction with a moderate amount of electron-phonon coupling has previously been shown to be inconsistent with experimental constraints on T(c), the isotope effect exponent, and the electron-phonon coupling. The present work allows for an electronic mechanism with an inverse isotope effect. In this case, the model is consistent with the experimental constraints. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP PENN, DR (reprint author), NATL INST STAND & TECHNOL,DIV ELECTR & OPT PHYS,GAITHERSBURG,MD 20899, USA. OI Crespi, Vincent/0000-0003-3846-3193 NR 12 TC 3 Z9 3 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 MAR 1 PY 1993 VL 47 IS 9 BP 5528 EP 5530 DI 10.1103/PhysRevB.47.5528 PG 3 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900100 ER PT J AU KONCZYKOWSKI, M VINOKUR, VM RULLIERALBENQUE, F YESHURUN, Y HOLTZBERG, F AF KONCZYKOWSKI, M VINOKUR, VM RULLIERALBENQUE, F YESHURUN, Y HOLTZBERG, F TI OBSERVATION OF FLUX CREEP THROUGH COLUMNAR DEFECTS IN YBA2CU3O7 CRYSTALS SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS; CRITICAL STATE; OXIDES AB Defects in the form of cylindrical amorphous tracks were introduced into YBa2Cu3O7 crystals by irradiation with 5.3-GeV Pb ions. The columnar defects formed provide maximum possible pinning of flux lines parallel to the tracks and induce giant enhancement of magnetic irreversibility. However, even for this strong pinning, magnetic decay was measured at high temperatures. Relaxation is nonlogarithmic and exhibits an increase of the effective barrier for flux creep with decreasing persistent current. This behavior is interpreted in the framework of the nucleation creep model. C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. BAR ILAN UNIV,DEPT PHYS,RAMAT GAN,ISRAEL. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. RP KONCZYKOWSKI, M (reprint author), ECOLE POLYTECH,SOLIDES IRRADIES LAB,F-91128 PALAISEAU,FRANCE. NR 16 TC 40 Z9 40 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 MAR 1 PY 1993 VL 47 IS 9 BP 5531 EP 5534 DI 10.1103/PhysRevB.47.5531 PG 4 WC Physics, Condensed Matter SC Physics GA KQ099 UT WOS:A1993KQ09900101 ER PT J AU DIANTONIO, P VUGMEISTER, BE TOULOUSE, J BOATNER, LA AF DIANTONIO, P VUGMEISTER, BE TOULOUSE, J BOATNER, LA TI POLAR FLUCTUATIONS AND 1ST-ORDER RAMAN-SCATTERING IN HIGHLY POLARIZABLE KTAO3 CRYSTALS WITH OFF-CENTER LI AND NB IONS SO PHYSICAL REVIEW B LA English DT Article ID PHASE-TRANSITIONS; KTA1-XNBXO3; BEHAVIOR; ORDER; PEAK AB Relatively low concentrations of randomly substituted off-center ions are known to induce ferroelectric order in highly polarizable crystals. In the case of potassium tantalate (KTaO3) doped with lithium or niobium, the results of first-order Raman scattering from two hard phonon modes (TO2 and TO3) show that polar microregions are formed at relatively high temperatures. At lower temperatures, and above a certain critical dopant concentration, the Raman results are consistent with the occurrence of a structural phase transition. These results can be reasonably explained by using a random-molecular-field theory that takes into account the indirect dipolar interactions mediated by the soft lattice. This approach accounts for the characteristic asymmetry of the TO2 Raman scattering detected at high temperatures and for the subsequent increase in the integrated scattering intensity with decreasing temperature. An analysis of the Raman results provides a means for determining the size of the polar microregions formed in the highly polarizable KTaO3 lattice. The good agreement obtained between the theoretical and experimental results provides support to the physical concepts embodied in the present theoretical approach to describing the onset of order in these systems. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP DIANTONIO, P (reprint author), LEHIGH UNIV,DEPT PHYS,BETHLEHEM,PA 18015, USA. RI Boatner, Lynn/I-6428-2013 OI Boatner, Lynn/0000-0002-0235-7594 NR 23 TC 91 Z9 91 U1 0 U2 13 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 MAR 1 PY 1993 VL 47 IS 10 BP 5629 EP 5637 DI 10.1103/PhysRevB.47.5629 PG 9 WC Physics, Condensed Matter SC Physics GA KT879 UT WOS:A1993KT87900010 ER PT J AU LEUNG, PW RUNGE, KJ AF LEUNG, PW RUNGE, KJ TI SPIN-1/2 QUANTUM ANTIFERROMAGNETS ON THE TRIANGULAR LATTICE SO PHYSICAL REVIEW B LA English DT Article ID ZERO-TEMPERATURE PROPERTIES; S=1/2 HEISENBERG-ANTIFERROMAGNET; GROUND-STATE PROPERTIES; SQUARE-LATTICE; EXACT DIAGONALIZATION; PHASE-TRANSITION; VALENCE-BOND; 2 DIMENSIONS; XY MODEL; SYSTEMS AB The spin-1/2 anisotropic Heisenberg antiferromagnet is studied at T = 0 on the triangular lattice via numerical diagonalization for system sizes up to N = 36 sites. Extrapolation to the thermodynamic limit suggests that the isotropic system possesses no, or very small, square-root 3 x square-root 3 magnetic order; no helical or chiral order; and spin-spin correlations consistent with that of a critical phase. For XY-like anisotropy there is long-ranged square-root 3 x square-root 3 magnetic order. In contrast to bipartite lattices, the standard first- and second-order spin-wave theories are not quantitatively accurate. Excitation energy gaps suggest that the lowest-lying excitations for the isotropic point are not spin-flip excitations in the thermodynamic limit. The results for the isotropic point appear to agree with recent series expansion, large-N expansion, and the original resonanting valence bond picture of Anderson, although they cannot be considered as conclusive evidence supporting any of these theories. C1 LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550. HONG KONG UNIV SCI & TECHNOL,DEPT PHYS,HONG KONG,HONG KONG. RP LEUNG, PW (reprint author), FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306, USA. NR 64 TC 75 Z9 76 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 MAR 1 PY 1993 VL 47 IS 10 BP 5861 EP 5873 DI 10.1103/PhysRevB.47.5861 PG 13 WC Physics, Condensed Matter SC Physics GA KT879 UT WOS:A1993KT87900036 ER PT J AU ELRICK, BM KOVARIK, MD JACOBS, AE MACREADY, WG AF ELRICK, BM KOVARIK, MD JACOBS, AE MACREADY, WG TI HUBBARD-MODEL IN THE STRONG-COUPLING APPROXIMATION SO PHYSICAL REVIEW B LA English DT Article ID T-J MODEL; GROUND-STATE PROPERTIES; QUANTUM ANTIFERROMAGNET; EXACT-DIAGONALIZATION; HOLE DYNAMICS; SUPERCONDUCTIVITY; BINDING; SYSTEMS; MOTION AB We report numerical results for the two-dimensional Hubbard model in the strong-coupling approximation, including the three-site terms omitted in the t-J model, for a 4 x 4 system with periodic boundary conditions. We study the one- and two-hole band structures, the root-mean-square hole-hole separation, and the hole-hole binding energy for both the t-J and the strong-coupling models. In the physical parameter region (8 < U/t < 40) believed appropriate for the high-temperature superconductors, the three-site terms enhance the hole mobility, increasing the one- and two-hole bandwidths and decreasing the binding energy, but changing the hole-hole separation only slightly; quantitative differences between the models range up to 40%. The transition (at large U/t) to the ferromagnetic Nagaoka state is sharper in the strong-coupling model; our results do not support a transition through all intermediate S values in the bulk. C1 OAK RIDGE NATL LAB, CTR COMPUTAT INTENS PROBLEMS, OAK RIDGE, TN 37831 USA. UNIV TENNESSEE, DEPT PHYS, KNOXVILLE, TN 37996 USA. OAK RIDGE NATL LAB, DIV PHYS, OAK RIDGE, TN 37831 USA. RP UNIV TORONTO, DEPT PHYS, TORONTO M5S 1A7, ONTARIO, CANADA. NR 38 TC 1 Z9 1 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1993 VL 47 IS 10 BP 6004 EP 6009 DI 10.1103/PhysRevB.47.6004 PG 6 WC Physics, Condensed Matter SC Physics GA KT879 UT WOS:A1993KT87900049 ER PT J AU REEVES, ME DITMARS, DA WOLF, SA VANDERAH, TA KRESIN, VZ AF REEVES, ME DITMARS, DA WOLF, SA VANDERAH, TA KRESIN, VZ TI EVIDENCE FOR STRONG ELECTRON-PHONON COUPLING FROM THE SPECIFIC-HEAT OF YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; UPPER CRITICAL-FIELD; HIGH-TEMPERATURE; SINGLE-CRYSTAL; ANISOTROPY; PARAMETERS; DIFFUSION; LATTICE AB We report precise measurements of the relative enthalpy of polycrystalline YBa2Cu3O7-delta at high temperatures (273 K < T < 700 K). From these data, we determine the lattice and electronic contributions to the specific heat. We find that the specific heat of the charge carriers follows the temperature dependence of a Fermi liquid with a Sommerfeld constant of 25+/-3 mJ/mole K2. By comparing our data to measurements made at low temperatures, we determine that the electron-phonon coupling is strong in YBa2Cu3O7-delta and adequate to account for the high transition temperature. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. USN,CTR WEAP,CHINA LAKE,CA 93555. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP REEVES, ME (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 39 TC 30 Z9 30 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 MAR 1 PY 1993 VL 47 IS 10 BP 6065 EP 6068 DI 10.1103/PhysRevB.47.6065 PG 4 WC Physics, Condensed Matter SC Physics GA KT879 UT WOS:A1993KT87900057 ER PT J AU ROBINSON, RA LAWSON, AC LYNN, JW BUSCHOW, KHJ AF ROBINSON, RA LAWSON, AC LYNN, JW BUSCHOW, KHJ TI INCOMMENSURATE MAGNETIC ORDER IN UPTGE SO PHYSICAL REVIEW B LA English DT Note ID HORHSI AB The orthorhombic uranium (1:1:1) ternary compound UPtGe has been studied by means of neutron powder diffraction, using both the time-of-flight method at a spallation source and the constant-wavelength reactor method. The material exhibits incommensurate magnetic order with q=(0,0.5543,0),with a uranium moment at the lowest temperature of 1.11mu(B) and a Neel temperature of 51 K. The moments are confined to the bc plane, which includes the propagation vector for the incommensurate modulation, and they rotate within that plane as one moves parallel to the b axis. The magnitude of the ordered uranium moment is the only order parameter in the problem. C1 NATL INST STAND & TECHNOL,DIV REACTOR RADIAT,GAITHERSBURG,MD 20899. PHILIPS RES LABS,5600 JA EINDHOVEN,NETHERLANDS. UNIV MARYLAND,COLL PK,MD 20742. RP ROBINSON, RA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 14 TC 15 Z9 15 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 MAR 1 PY 1993 VL 47 IS 10 BP 6138 EP 6141 DI 10.1103/PhysRevB.47.6138 PG 4 WC Physics, Condensed Matter SC Physics GA KT879 UT WOS:A1993KT87900071 ER PT J AU LEI, M SARRAO, JL VISSCHER, WM BELL, TM THOMPSON, JD MIGLIORI, A WELP, UW VEAL, BW AF LEI, M SARRAO, JL VISSCHER, WM BELL, TM THOMPSON, JD MIGLIORI, A WELP, UW VEAL, BW TI ELASTIC-CONSTANTS OF A MONOCRYSTAL OF SUPERCONDUCTING YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Note ID SINGLE-CRYSTALS; BRILLOUIN SPECTROSCOPY; SOUND VELOCITIES; Y1BA2CU3O7 AB All nine independent elastic constants c(ij) of a YBa2Cu3O7-delta monocrystal were determined at room temperature using resonant ultrasound spectroscopy. Shear and Young moduli obtained from the c(ij) by the Voigt-Reuss-Hill averaging method agree well with the pulse-echo results on a polycrystal. The Debye temperature calculated from the elastic constants agrees with the specific-heat measurement. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP LEI, M (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 22 TC 90 Z9 92 U1 0 U2 12 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1993 VL 47 IS 10 BP 6154 EP 6156 DI 10.1103/PhysRevB.47.6154 PG 3 WC Physics, Condensed Matter SC Physics GA KT879 UT WOS:A1993KT87900075 ER PT J AU LIOU, MK LIN, DH GIBSON, BF AF LIOU, MK LIN, DH GIBSON, BF TI ANATOMY OF THE SOFT PHOTON APPROXIMATION IN HADRON-HADRON BREMSSTRAHLUNG SO PHYSICAL REVIEW C LA English DT Article ID NEUTRON-PROTON BREMSSTRAHLUNG; EXPERIMENTAL MAGNETIC-MOMENT; GAUGE-THEORY; AMPLITUDES; DELTA++(1232); ZEROS AB A modified Low procedure for constructing soft-photon amplitudes has been used to derive two general soft-photon amplitudes, a two-s-two-t special amplitude M(mu)TsTts and a two-u-two-t special amplitude M(mu)TuTts, where s, t, and u are the Mandelstam variables. M(mu)TsTts depends only on the elastic T matrix evaluated at four sets of (s, t) fixed by the requirement that the amplitude be free of derivatives (partial derivative T/partial derivative s and/or partial derivative T/partial derivative t). Likewise M(mu)TuTts depends only on the elastic T matrix evaluated at four sets of (u, t) also fixed by the requirement that the amplitude M(mu)TuTts be free of derivatives (partial derivative T/partial derivative u and/or partial derivative T/partial derivative t). In deriving these two amplitudes, we imposed the condition that M(mu)TsTts and M(mu)TuTts reduce to M(mu)TsTtsBar and M(mu)TuTtsBAR, respectively, their tree-level approximations. The amplitude M(mu)TsTtsBAR represents photon emission from a sum of one-particle t-channel exchange diagrams and one-particle s-channel exchange diagrams, while the amplitude M(mu)TuTts represents photon emission from a sum of one-particle t-channel exchange diagrams and one-particle u-channel exchange diagrams. The precise expressions for M(mu)TuTts and M(mu)TuTts are determined by using the radiation decomposition identities of Brodsky and Brown. We also demonstrate that two Low amplitudes M(mu)low(st) and M(mu)Low(ut), derived using Low's standard procedure, can be obtained from M(mu)TsTts and M(mu)TuTts, respectively, as an expansion in powers of K (photon energy) when terms of order K and higher are neglected. We point out that it is theoretically impossible to describe all nuclear bremsstrahlung processes by using only a single class of soft-photon amplitudes. At least two different classes are required: the amplitudes (such as M(mu)TsTts, M(mu)Low(st), and M(mu)TsTtsBar), which depend on s and t, and the amplitudes (such as M(mu)TuTts, M(mu)Low(ut), and M(mu)TuTtsBAr), which depend on u and t. When resonance effects are important, the amplitude M(mu)TsTts, not M(mu)Low(st), should be used. For processes with strong u-channel exchange effects, the amplitude M(mu)TuTts should be the first choice. As for those processes which exhibit neither resonance effects nor u-channel exchange effects, all amplitudes converge essentially to the same description. Finally, we discuss the relationship between the two classes. C1 CUNY BROOKLYN COLL,INST NUCL THEORY,BROOKLYN,NY 11210. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP LIOU, MK (reprint author), CUNY BROOKLYN COLL,DEPT PHYS,BROOKLYN,NY 11210, USA. NR 45 TC 28 Z9 28 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 973 EP 990 DI 10.1103/PhysRevC.47.973 PG 18 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100009 ER PT J AU AFNAN, IR GIBSON, BF AF AFNAN, IR GIBSON, BF TI RESONANCES IN LAMBDA-D SCATTERING AND THE SIGMA HYPERTRITON SO PHYSICAL REVIEW C LA English DT Article ID HYPERNUCLEAR BOUND-STATE; SYSTEMS; HE-4(SIGMA); POLES AB Using separable NN and LAMBDAN-SIGMAN potentials in the Faddeev equations, we have demonstrated that the predicted enhancement in the LAMBDAd cross section near the SIGMAd threshold is associated with resonance poles in the scattering amplitude. The positions of these poles, on the second Riemann sheet of the complex energy plane, are determined by examining the eigenvalues of the kernel of the Faddeev equations. This suggests that for a certain class of LAMBDAN-SIGMAN potentials we can form a SIGMA hypertriton with a width of about 8 MeV. C1 UNIV WASHINGTON,INST NUCL THEORY,SEATTLE,WA 98195. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP AFNAN, IR (reprint author), FLINDERS UNIV S AUSTRALIA,SCH PHYS SCI,BEDFORD PK,SA 5042,AUSTRALIA. NR 27 TC 20 Z9 20 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1000 EP 1012 DI 10.1103/PhysRevC.47.1000 PG 13 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100011 ER PT J AU JUNGCLAUS, A BORNER, HG JOLIE, J ULBIG, S CASTEN, RF ZAMFIR, NV VONBRENTANO, P LIEB, KP AF JUNGCLAUS, A BORNER, HG JOLIE, J ULBIG, S CASTEN, RF ZAMFIR, NV VONBRENTANO, P LIEB, KP TI ABSOLUTE B(E1) VALUES IN THE SHAPE TRANSITIONAL SM-148-152 ISOTOPES SO PHYSICAL REVIEW C LA English DT Article ID INTERACTING BOSON MODEL; LEVEL DENSITIES; SM ISOTOPES; STATES; SPECTROSCOPY; NUCLEI AB The lifetimes of the lowest 3- and 1- states in Sm-148-152 have been determined employing the gamma-ray-induced Doppler broadening technique. The B(E1;3- --> 2+) transition rates are compared to the corresponding B (E1;1- --> 0+) values and interpreted in the framework of the interacting boson approximation sdf model. The qualitative behavior of these absolute transition rates can be understood in a simple physical picture by considering only the one-body part in the E1 transition operator. A more complex form including two-body terms is needed to explain simultaneously all available experimental data related to these levels. C1 UNIV GOTTINGEN,INST PHYS 2,W-3400 GOTTINGEN,GERMANY. BROOKHAVEN NATL LAB,UPTON,NY 11973. INST ATOM PHYS,BUCHAREST,ROMANIA. CLARK UNIV,WORCESTER,MA 01610. UNIV COLOGNE,INST KERNPHYS,W-5000 COLOGNE 41,GERMANY. RP JUNGCLAUS, A (reprint author), INST MAX VON LAUE PAUL LANGEVIN,F-38042 GRENOBLE,FRANCE. RI Zamfir, Nicolae Victor/F-2544-2011 NR 24 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1020 EP 1026 DI 10.1103/PhysRevC.47.1020 PG 7 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100013 ER PT J AU HAMILTON, WD CROFT, WL BRANTLEY, WH RAYBURN, LA GIRIT, IC BRANT, S PAAR, V AF HAMILTON, WD CROFT, WL BRANTLEY, WH RAYBURN, LA GIRIT, IC BRANT, S PAAR, V TI GAMMA-RAY MULTIPOLE MIXING RATIOS IN GE-71 SO PHYSICAL REVIEW C LA English DT Article ID BOSON-FERMION MODEL; COLLECTIVE STATES; NUCLEI; LIMIT AB The multipole mixing ratios of gamma-ray transitions between low-lying states in Ge-71 were determined by measuring gamma-ray anisotropies from oriented As-71 nuclei. Nuclear orientation of (AsFe)-As-71 samples occurred through the magnetic hyperfine interaction at 5 mK. The interacting boson-fermion model was used to calculate transition matrix elements and, in general, there is good agreement between experimental results and theoretical values of E2:M1 multipole mixing ratios. C1 FURMAN UNIV,GREENVILLE,SC 29613. OAK RIDGE ASSOCIATED UNIV,OAK RIDGE,TN. UNIV ZAGREB,YU-41000 ZAGREB,CROATIA. RP HAMILTON, WD (reprint author), MISSISSIPPI STATE UNIV,MISSISSIPPI STATE,MS 39762, USA. RI Paar, Vladimir/D-8009-2015 NR 15 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1042 EP 1047 DI 10.1103/PhysRevC.47.1042 PG 6 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100016 ER PT J AU SMITH, DA FORTUNE, HT ODONNELL, JM SILK, JD GLUCKMAN, B CRITTENDEN, R CLAYTOR, N MORRIS, CL MCGILL, JA AF SMITH, DA FORTUNE, HT ODONNELL, JM SILK, JD GLUCKMAN, B CRITTENDEN, R CLAYTOR, N MORRIS, CL MCGILL, JA TI PION DOUBLE CHARGE-EXCHANGE ON FE-56 AT T-PI = 400 MEV SO PHYSICAL REVIEW C LA English DT Article ID GIANT-DIPOLE RESONANCES; ISOBARIC-ANALOG-STATE; MASS DEPENDENCE; TRANSITIONS; NUCLEI AB Data were measured for pion double charge exchange on Fe-56 at T(pi) = 400 MeV and three laboratory angles: 0-degrees, 10-degrees, 20-degrees. Angular distributions were measured for the double isobaric analog state, the analog of the giant dipole resonance, and the giant dipole built upon itself. The excitation function of each of these resonances is discussed. Evidence is found for separate J(pi) components of the double dipole resonance, and cross sections of these components axe extracted. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SMITH, DA (reprint author), UNIV PENN,PHILADELPHIA,PA 19104, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1053 EP 1059 DI 10.1103/PhysRevC.47.1053 PG 7 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100018 ER PT J AU PEREY, CM PEREY, FG HARVEY, JA HILL, NW LARSON, NM MACKLIN, RL LARSON, DC AF PEREY, CM PEREY, FG HARVEY, JA HILL, NW LARSON, NM MACKLIN, RL LARSON, DC TI NI-58+N TRANSMISSION, DIFFERENTIAL ELASTIC-SCATTERING, AND CAPTURE MEASUREMENTS AND ANALYSIS UP TO 813 KEV SO PHYSICAL REVIEW C LA English DT Article ID NEUTRON-CAPTURE; CROSS-SECTIONS; RESONANCE AB High-resolution neutron cross section measurements for Ni-58-enriched targets wre made at the Oak Ridge Electron Linear Accelerator of transmission below 20 MeV, of differential elastic scattering from 10 keV to 5 MeV, and of capture from 2.6 keV to 2.5 MeV. The transmission data were analyzed from 0.1 to 813 keV with a multilevel R-matrix code which uses Bayes' theorem for the fitting process. This code provides energies and neutron widths of resonances within the analyzed region, as well as a possible parametrization for resonances external to that region, as a way of describing the smooth cross section over the entire energy range. The differential elastic data at different scattering angles were compared to theoretical calculations from 30 to 813 keV using an R-function code which is based on the Blatt-Biedenharn formalism. Various combinations of spin and parity were tested to predict cross sections for the well-defined l > 0 resonances, and comparison with the data then provided spin and parity assignments for most of these resonances. The capture data were analyzed from 5 to 450 keV with a least-squares fitting code using the Breit-Wigner formula. The resulting set of resonance parameters yields values for the thermal total and capture cross sections within experimental uncertainties. A total of 482 resonances are reported, of which five are fictitious s-wave resonances outside the analyzed energy region and 61 are seen and analyzed only in the capture data. The reduced widths of the 61 s-wave resonances follow the Porter-Thomas distribution and their nearest neighbor spacings agree with the Wigner distribution. The average s-wave level spacing is 13.1 +/- 0.9 keV and the s-wave strength function is (3.2 +/- 0.6) X 10(-4). Since most of the large non-s-wave resonances have their angular momentum assigned with confidence, the strength functions for the p- and d-wave resonances could be determined; values are (1.3 +/- 0.2) X 10(-4) and (3.0 +/- 0.4) X 10(-4), respectively. The level densities calculated with the Fermi-gas model for l = 0 and l > 0 resonances are compared with the cumulative number of observed resonances. The average radiation widths were deduced from resonances analyzed in the three data sets below 450 keV. The mean values and standard deviations of the distributions of the radiation widths are 2.3 +/- 1.7 eV for the s-wave resonances, 0.77 +/- 0.32 eV for the p-wave resonances, and 1.4 +/- 0.5 eV for the d-wave resonances. The average capture cross section as a function of the incident neutron energy is compared to a prediction based on the tail of the giant electric dipole resonance. RP PEREY, CM (reprint author), OAK RIDGE NATL LAB,POB 2008,OAK RIDGE,TN 37831, USA. NR 55 TC 15 Z9 15 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1143 EP 1169 DI 10.1103/PhysRevC.47.1143 PG 27 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100028 ER PT J AU CECIL, FE LIU, H YAN, JS HALE, GM AF CECIL, FE LIU, H YAN, JS HALE, GM TI MEASUREMENT OF BRANCHING RATIOS OF LOW-ENERGY DEUTERON-INDUCED NUCLEAR-REACTIONS ON H-2,LI-6 AND B-10 SO PHYSICAL REVIEW C LA English DT Article ID CROSS-SECTIONS; ELECTRIC POLARIZABILITY; FUSION AB We have measured the branching ratios (H(d,p)H/H(d,n)He)-H-2-H-3-H-2-He-3, (Li(d,p)Li/Li(d,alpha)He)-Li-6-Li-7-Li-6-He-4, and (B(d,p)B/B(d,alpha)Be)-B-10-B-11-B-10-Be-8 between c.m. energies of 3 and 15 keV, 20 and 135 keV, and 58 and 142 keV, respectively. Our measurements of the H-2-d reaction are in good agreement with R-matrix calculations of the branching ratio. We find no enhancement of the (d,p) branches of these reactions at the lowest observed energies. Implications of our findings to recent claims of anomalous production of heat from deuterium-metal systems are presented. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP CECIL, FE (reprint author), COLORADO SCH MINES,DEPT PHYS,GOLDEN,CO 80401, USA. NR 26 TC 12 Z9 12 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1178 EP 1183 DI 10.1103/PhysRevC.47.1178 PG 6 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100030 ER PT J AU KAGARLIS, MA FORTUNE, HT HUI, P LOE, S SMITH, DA WILLIAMS, AL URBINA, J AF KAGARLIS, MA FORTUNE, HT HUI, P LOE, S SMITH, DA WILLIAMS, AL URBINA, J TI DOUBLE CHARGE-EXCHANGE IN NB-93(PI+,PI-)TC-93 AT T-PI = 164, 230, AND 294 MEV SO PHYSICAL REVIEW C LA English DT Article ID RESONANCE REGION; ISOBARIC ANALOG; STATE AB In pion-induced double charge exchange on Nb-93, a number of new discrete states, in addition to the ground state and the double isobaric analog state (DIAS), have been observed in the residual Tc-93 nucleus. Cross sections for the different states exhibit widely different energy dependence characteristics. In particular, the state just below the DIAS has a very different excitation function from the DIAS. In addition, the cross section of the giant resonance GDRxIAS has been measured at T(pi) = 230 and 294 MeV. C1 UNIV PENN,PHILADELPHIA,PA 19104. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NEW MEXICO STATE UNIV,LAS CRUCES,NM 88003. NR 14 TC 7 Z9 7 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1219 EP 1224 DI 10.1103/PhysRevC.47.1219 PG 6 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100034 ER PT J AU CIZEWSKI, JA HOTCHKIS, MAC DURELL, JL COPNELL, J MOWBRAY, AS FITZGERALD, J PHILLIPS, WR AHMAD, I CARPENTER, MP JANSSENS, RVF KHOO, TL MOORE, EF MORSS, LR BENET, P YE, D AF CIZEWSKI, JA HOTCHKIS, MAC DURELL, JL COPNELL, J MOWBRAY, AS FITZGERALD, J PHILLIPS, WR AHMAD, I CARPENTER, MP JANSSENS, RVF KHOO, TL MOORE, EF MORSS, LR BENET, P YE, D TI NEW N = 84 ISOTONE - TE-136 SO PHYSICAL REVIEW C LA English DT Note ID DEFORMATION; NUCLEI; REGION; BANDS AB We have assigned gamma-ray transitions to 136Te by examining the prompt gamma radiation following spontaneous fission of Cm-248. The transitions were identified in spectra gated on the Ru complementary fragments, and confirmed by studying prompt gamma rays following spontaneous fission of Cf-252. The results are examined in terms of the systematics of other tellurium and N = 84 nuclei. C1 UNIV MANCHESTER,DEPT PHYS,MANCHESTER M13 9PL,LANCS,ENGLAND. ARGONNE NATL LAB,ARGONNE,IL 60439. PURDUE UNIV,W LAFAYETTE,IN 47907. UNIV NOTRE DAME,NOTRE DAME,IN 46556. RP CIZEWSKI, JA (reprint author), RUTGERS STATE UNIV,DEPT PHYS & ASTRON,NEW BRUNSWICK,NJ 08903, USA. RI Carpenter, Michael/E-4287-2015; OI Carpenter, Michael/0000-0002-3237-5734; Hotchkis, Michael/0000-0003-2321-0222 NR 14 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1294 EP 1297 DI 10.1103/PhysRevC.47.1294 PG 4 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100043 ER PT J AU CULLEN, DM LEE, IY BAKTASH, C GARRETT, JD JOHNSON, NR MCGOWAN, FK WINCHELL, DF AF CULLEN, DM LEE, IY BAKTASH, C GARRETT, JD JOHNSON, NR MCGOWAN, FK WINCHELL, DF TI X-RAY YIELDS OF SUPERDEFORMED STATES IN HG-193 SO PHYSICAL REVIEW C LA English DT Note ID OCTUPOLE CORRELATIONS; NUCLEI AB The K(alpha)-x-ray yields associated with the superdeformed and normal-deformed bands in 193Hg have been measured. The results indicate an excess yield of K(alpha)-x rays in coincidence with the superdeformed cascade relative to that in coincidence with the normal-deformed cascade. The internal conversion of known transitions along the superdeformed cascade cannot account for the observed K(alpha)-x-ray yield. It is likely that this excess x-ray yield is associated with low-energy interband-M1 transitions competing with the low-spin superdeformed-E2 transitions. RP CULLEN, DM (reprint author), OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1298 EP 1301 DI 10.1103/PhysRevC.47.1298 PG 4 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100044 ER PT J AU KURATH, D AF KURATH, D TI FUSION RESONANCE IN HE-5, LI-5 SO PHYSICAL REVIEW C LA English DT Note AB A shell model description of the 3/2+ resonance is given to show that the main features of the experimental observations can be described by this model as well as by the resonating group model. RP KURATH, D (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP 1306 EP 1306 DI 10.1103/PhysRevC.47.1306 PG 1 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100046 ER PT J AU OLIVEIRA, JRB FRAUENDORF, S DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS BEAUSANG, CW DRAPER, JE DUYAR, C RUBEL, E BECKER, JA HENRY, EA ROY, N AF OLIVEIRA, JRB FRAUENDORF, S DELEPLANQUE, MA DIAMOND, RM STEPHENS, FS BEAUSANG, CW DRAPER, JE DUYAR, C RUBEL, E BECKER, JA HENRY, EA ROY, N TI ROTATION-INDUCED TRANSITION FROM SUPERFLUID TO NORMAL PHASE IN MESOSCOPIC SYSTEMS - YB-168 AND ADJACENT NUCLEI SO PHYSICAL REVIEW C LA English DT Note ID HIGH-SPIN; MODEL AB The transition from strong static pairing to weak static pairing and its consequences to the excitation spectrum of a mesoscopic (medium number of particles) system are investigated. New levels have been measured in Yb-168. A reasonable description of the A almost-equal-to 168 isotopes spectra is obtained. The adequacy of the phase transition concept is discussed. C1 UNIV CALIF DAVIS,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP OLIVEIRA, JRB (reprint author), LAWRENCE BERKELEY LAB,DIV NUCL SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Oliveira, Jose Roberto/J-3124-2012 OI Oliveira, Jose Roberto/0000-0003-1362-7382 NR 12 TC 17 Z9 18 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP R926 EP R929 DI 10.1103/PhysRevC.47.R926 PG 4 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100003 ER PT J AU ROY, N BECKER, JA HENRY, EA BRINKMAN, MJ STOYER, MA CIZEWSKI, JA DIAMOND, RM DELEPLANQUE, MA STEPHENS, FS BEAUSANG, CW DRAPER, JE AF ROY, N BECKER, JA HENRY, EA BRINKMAN, MJ STOYER, MA CIZEWSKI, JA DIAMOND, RM DELEPLANQUE, MA STEPHENS, FS BEAUSANG, CW DRAPER, JE TI COLLECTIVE BAND IN HG-193 WITH EX GREATER-THAN-OR-EQUAL-TO 5.7 MEV SO PHYSICAL REVIEW C LA English DT Note ID EXCITATIONS AB The nucleus 193Hg was populated in the reaction Yb-176(Ne-22,5n) at the incident energy E(Ne-22) = 110 MeV. Reaction gamma rays were detected with a Ge-detector array. A new ''collective'' structure was observed at E(x) > 5.7 MeV. The states of the structure extend from I greater-than-or-equal-to 47/2 to I + 10, and they decay with competing dipole and quadrupole transitions. The structure is populated very strongly in this reaction: the lowest member is produced with approximately 20% of the 193Hg cross section. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. NR 24 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 0556-2813 J9 PHYS REV C JI Phys. Rev. C PD MAR PY 1993 VL 47 IS 3 BP R930 EP R934 DI 10.1103/PhysRevC.47.R930 PG 5 WC Physics, Nuclear SC Physics GA KT881 UT WOS:A1993KT88100004 ER PT J AU SUPEK, I BARLOW, DB BRISCOE, WJ DAVIS, JF KIM, GJ LANE, DW MOKHTARI, A NEFKENS, BMK PILLAI, C SADLER, ME SEFTOR, CJ TARAGIN, MF WIGHTMAN, JA AF SUPEK, I BARLOW, DB BRISCOE, WJ DAVIS, JF KIM, GJ LANE, DW MOKHTARI, A NEFKENS, BMK PILLAI, C SADLER, ME SEFTOR, CJ TARAGIN, MF WIGHTMAN, JA TI SPIN-ROTATION PARAMETER-A AND PARAMETER-R FOR PI+P AND PI-P ELASTIC-SCATTERING FROM 427 TO 657 MEV/C SO PHYSICAL REVIEW D LA English DT Article ID PARTIAL-WAVE ANALYSIS; C ANALYZING POWER; QUARK-MODEL; 687 MEV/C; 625 MEV/C; PROTON POLARIZATION; CHARGE-EXCHANGE; CROSS-SECTIONS; BARYONS; PHOTOPRODUCTION AB The spin-rotation parameters A and R and the related spin-rotation angle beta have been measured for pi+p and pi-p elastic scattering using protons polarized in the scattering plane. The pion-beam momenta are 427, 471, 547, 625, and 657 MeV/c and the angular range is -0.9 less-than-or-equal-to cosTHETA(c.m.) less-than-or-equal-to 0.3. The scattered pion and recoil proton were detected in coincidence, using a scintillator hodoscope for the pions, and the Large Acceptance Spectrometer combined with the JANUS polarimeter for the recoil protons. The results are compared with the four recent piN partial wave analyses (PWA's). Our data show that the major features of these PWA's are correct. The A and R measurements complete our program of pion-nucleon experiments, providing full data sets at three of the above beam momenta. Such sets can be used to test the constraints in the PWA's or to obtain a model-independent set of piN scattering amplitudes. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. GEORGE WASHINGTON UNIV,WASHINGTON,DC 20052. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RUDJER BOSKOVIC INST,41000 ZAGREB,CROATIA. RP SUPEK, I (reprint author), ABILENE CHRISTIAN UNIV,ABILENE,TX 79699, USA. NR 49 TC 10 Z9 11 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 MAR 1 PY 1993 VL 47 IS 5 BP 1762 EP 1775 DI 10.1103/PhysRevD.47.1762 PG 14 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KT880 UT WOS:A1993KT88000006 ER PT J AU PETRIDIS, A LASSILA, KE VARY, JP AF PETRIDIS, A LASSILA, KE VARY, JP TI DIRECT-PHOTON PRODUCTION IN HEAVY-ION COLLISIONS SO PHYSICAL REVIEW D LA English DT Article ID INELASTIC MUON SCATTERING; QUARK-CLUSTER-MODEL; NUCLEON STRUCTURE FUNCTIONS; LEPTON-PAIR PRODUCTION; ELECTRON-SCATTERING; VIRTUAL PHOTONS; IRON TARGETS; SMALL VALUES; DEUTERIUM; QCD AB To study plasma photons in relativistic heavy-ion collisions one must account for direct photons from all possible sources. The aim of this work is the examination of the effect that initial-state parton distributions in nuclei, distorted to accommodate the European Muon Collaboration (EMC) effect, will have on the direct-photon spectrum produced relative to the basic QCD subprocesses in free nucleon-nucleon collisions. Since this parton distortion has been quite satisfactorily described by an expansion of the nuclear state in multiquark color-singlet (cluster) basis states, this ''quark cluster model'' should give useful predictions for the reflection of the EMC effect in the nucleus-nucleus direct photons. The presence of such clusters enhances the phase space available to direct photons. As a result, the direct-photon yield per nucleon shows significant dependence on the photon transverse momentum p(T). The ratio of the cross section per nucleon for zero photon longitudinal rapidity in collisions of two similar heavy nuclei to the cross section for collisions of two free protons exhibits deviations from unity, being less than one for small values of p(T), and larger than one for large values of p(T). We investigate the sensitivity of this ratio on the mass number of the colliding projectiles, on the effective multiquark cluster probability, and on the nucleon or multiquark cluster gluon distributions for various values of the heavy-ion momentum per nucleon. C1 SOLTAN INST NUCL STUDIES,PL-00681 WARSAW,POLAND. IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP PETRIDIS, A (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011, USA. NR 50 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD MAR 1 PY 1993 VL 47 IS 5 BP 1906 EP 1918 DI 10.1103/PhysRevD.47.1906 PG 13 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KT880 UT WOS:A1993KT88000015 ER PT J AU SNYDER, SC REYNOLDS, LD LASSAHN, GD FINCKE, JR SHAW, CB KEARNEY, RJ AF SNYDER, SC REYNOLDS, LD LASSAHN, GD FINCKE, JR SHAW, CB KEARNEY, RJ TI DETERMINATION OF GAS-TEMPERATURE AND VELOCITY PROFILES IN AN ARGON THERMAL-PLASMA JET BY LASER-LIGHT SCATTERING SO PHYSICAL REVIEW E LA English DT Article ID LOCAL THERMODYNAMIC-EQUILIBRIUM; ARC PLASMA; CRITERIA AB Gas-temperature and velocity profiles at the exit plane of a thermal argon plasma torch have been determined directly from a high-resolution Doppler-shifted line-shape analysis of laser light scattered by the plasma. Peak temperature and velocity values observed were 13 350 K+/-7% and 1100 m s-1+/-3%. Velocities as low as 45 m s-1+/-45% were measured in the fringe of the jet. An injection-seeded pulsed neodymium-doped yttrium aluminum garnet laser was used as the laser source and the scattered laser light was analyzed with a scanning tandem Fabry-Perot interferometer. Temperature data obtained from laser scattering are compared with values obtained from emission spectroscopy and show a severe departure from local thermodynamic equilibrium (LTE) in the outer regions of the jet. Gas temperatures were observed to increase as the torch operating current increased from 300 to 500 A, but remained constant as the operating current increased to 900 A. However, electron temperatures and densities continued to increase with operating current. This suggests that increasing the electrical power drives the plasma away from LTE. Measured temperature and velocity profiles were found to be nearly parabolic. 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 34 TC 42 Z9 42 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD MAR PY 1993 VL 47 IS 3 BP 1996 EP 2005 DI 10.1103/PhysRevE.47.1996 PG 10 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA KY137 UT WOS:A1993KY13700059 ER PT J AU FONTANA, W STADLER, PF BORNBERGBAUER, EG GRIESMACHER, T HOFACKER, IL TACKER, M TARAZONA, P WEINBERGER, ED SCHUSTER, P AF FONTANA, W STADLER, PF BORNBERGBAUER, EG GRIESMACHER, T HOFACKER, IL TACKER, M TARAZONA, P WEINBERGER, ED SCHUSTER, P TI RNA FOLDING AND COMBINATORY LANDSCAPES SO PHYSICAL REVIEW E LA English DT Article ID SECONDARY STRUCTURES; RUGGED LANDSCAPES; STATISTICAL-MECHANICS; SOLVABLE MODEL; SPIN-GLASS; SEQUENCES; OPTIMIZATION; PREDICTIONS; EVOLUTION; WALKS AB In this paper we view the folding of polynucleotide (RNA) sequences as a map that assigns to each sequence a minimum-free-energy pattern of base pairings, known as secondary structure. Considering only the free energy leads to an energy landscape over the sequence space. Taking into account structure generates a less visualizable nonscalar ''landscape,'' where a sequence space is mapped into a space of discrete ''shapes.'' We investigate the statistical features of both types of landscapes by computing autocorrelation functions, as well as distributions of energy and structure distances, as a function of distance in sequence space. RNA folding is characterized by very short structure correlation lengths compared to the diameter of the sequence space. The correlation lengths depend strongly on the size and the pairing rules of the underlying nucleotide alphabet. Our data suggest that almost every minimum-free-energy structure is found within a small neighborhood of any random sequence. The interest in such landscapes results from the fact that they govern natural and artificial processes of optimization by mutation and selection. Simple statistical model landscapes, like Kauffman and Levin's n-k model [J. Theor. Biol. 128, 11 (1987)], are often used as a proxy for understanding realistic landscapes, like those induced by RNA folding. We make a detailed comparison between the energy landscapes derived from RNA folding and those obtained from the n-k model. We derive autocorrelation functions for several variants of the n-k model, and briefly summarize work on its fine structure. The comparison leads to an estimate for k = 7-8, independent of n, where n is the chain length. While the scaling behaviors agree, the fine structure is considerably different in the two cases. The reason is seen to be the extremely high frequency of neutral neighbors, that is, neighbors with identical energy (or structure), in the RNA case. C1 LOS ALAMOS NATL LAB, DIV THEORET T13, LOS ALAMOS, NM 87544 USA. UNIV VIENNA, INST THEORET CHEM, A-1090 VIENNA, AUSTRIA. MAX PLANCK INST BIOPHYS CHEM, W-3400 GOTTINGEN, GERMANY. UNIV AUTONOMA MADRID, DEPT FIS MAT CONDENSADA C12, E-28049 MADRID, SPAIN. INST MOLEK BIOTECHNOL, O-6900 JENA, GERMANY. RP FONTANA, W (reprint author), SANTA FE INST, 1660 OLD PECOS TRAIL, SANTA FE, NM 87501 USA. RI Hofacker, Ivo/A-2378-2013; Stadler, Peter F./L-7857-2015; Bornberg-Bauer, Erich/A-1563-2013; OI Hofacker, Ivo/0000-0001-7132-0800; Stadler, Peter F./0000-0002-5016-5191; Bornberg-Bauer, Erich/0000-0002-1826-3576; Tarazona Lafarga, Pedro Jose/0000-0002-6704-9533 NR 36 TC 164 Z9 164 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1539-3755 EI 1550-2376 J9 PHYS REV E JI Phys. Rev. E PD MAR PY 1993 VL 47 IS 3 BP 2083 EP 2099 DI 10.1103/PhysRevE.47.2083 PG 17 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA KY137 UT WOS:A1993KY13700069 ER PT J AU ZUREK, WH HABIB, S PAZ, JP AF ZUREK, WH HABIB, S PAZ, JP TI COHERENT STATES VIA DECOHERENCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM BROWNIAN-MOTION; WAVE PACKET; ENVIRONMENT AB The rate at which pure initial states deteriorate into mixtures is computed for a harmonic oscillator interacting with an environment in thermal equilibrium. The decoherence process resulting from this interaction selects a set of states characterized by maximal stability (or minimal loss of predictive power) which can be quantified by the rate of increase in either linear or statistical entropy. In the weak coupling limit, coherent states are shown to produce the least entropy, thus becoming the natural counterparts of classical points in phase space. RP ZUREK, WH (reprint author), LOS ALAMOS NATL LAB,MAIL STOP B288,LOS ALAMOS,NM 87545, USA. RI Paz, Juan/C-5947-2008 NR 34 TC 472 Z9 483 U1 2 U2 17 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 MAR 1 PY 1993 VL 70 IS 9 BP 1187 EP 1190 DI 10.1103/PhysRevLett.70.1187 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700001 ER PT J AU GIBBONS, LK BARKER, AR BRIERE, RA MAKOFF, G PAPADIMITRIOU, V PATTERSON, JR SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R WOODS, M YAMAMOTO, H SWALLOW, EC BOCK, GJ COLEMAN, R ENAGONIO, J HSIUNG, YB RAMBERG, E STANFIELD, K TSCHIRHART, R YAMANAKA, T GOLLIN, GD KARLSSON, M OKAMITSU, JK DEBU, P PEYAUD, B TURLAY, R VALLAGE, B AF GIBBONS, LK BARKER, AR BRIERE, RA MAKOFF, G PAPADIMITRIOU, V PATTERSON, JR SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R WOODS, M YAMAMOTO, H SWALLOW, EC BOCK, GJ COLEMAN, R ENAGONIO, J HSIUNG, YB RAMBERG, E STANFIELD, K TSCHIRHART, R YAMANAKA, T GOLLIN, GD KARLSSON, M OKAMITSU, JK DEBU, P PEYAUD, B TURLAY, R VALLAGE, B TI NEW MEASUREMENTS OF THE NEUTRAL KAON PARAMETERS DELTA-M, TAU-S, PHI-00-PHI+-, AND PHI+- SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHASES; DECAYS AB The full E731 data set is used to provide precise determinations of several parameters of the neutral kaon. We find the K(S) lifetime tau(S) = (0.8929 +/- 0.0016) x 10(-10) s, the K(L)-K(S) mass difference DELTAm = (0.5286 +/- 0.0028) x 10(10)HBAR s-1 the phase of eta+-, PHI+- = 42.2-degrees +/- 1.4-degrees, and the phase difference between PHI00 and PHI+-, DELTAPHI = -1.6-degrees +/- 1.2-degrees. Comparisons with previous experiments and with CPT symmetry are given. C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. ELMHURST COLL,ELMHURST,IL 60126. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. CENS,DEPT PHYS PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE. RP GIBBONS, LK (reprint author), UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637, USA. RI Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 12 TC 55 Z9 55 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 MAR 1 PY 1993 VL 70 IS 9 BP 1199 EP 1202 DI 10.1103/PhysRevLett.70.1199 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700004 ER PT J AU GIBBONS, LK BARKER, AR BRIERE, RA MAKOFF, G PAPADIMITRIOU, V PATTERSON, JR SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R WOODS, M YAMAMOTO, H SWALLOW, EC BOCK, GJ COLEMAN, R ENAGONIO, J HSIUNG, YB RAMBERG, E STANFIELD, K TSCHIRHART, R YAMANAKA, T GOLLIN, GD KARLSSON, M OKAMITSU, JK DEBU, P PEYAUD, B TURLAY, R VALLAGE, B AF GIBBONS, LK BARKER, AR BRIERE, RA MAKOFF, G PAPADIMITRIOU, V PATTERSON, JR SCHWINGENHEUER, B SOMALWAR, SV WAH, YW WINSTEIN, B WINSTON, R WOODS, M YAMAMOTO, H SWALLOW, EC BOCK, GJ COLEMAN, R ENAGONIO, J HSIUNG, YB RAMBERG, E STANFIELD, K TSCHIRHART, R YAMANAKA, T GOLLIN, GD KARLSSON, M OKAMITSU, JK DEBU, P PEYAUD, B TURLAY, R VALLAGE, B TI MEASUREMENT OF THE CP-VIOLATION PARAMETER RE(EPSILON'/EPSILON) SO PHYSICAL REVIEW LETTERS LA English DT Article ID 1ST AB A measurement of the CP-violation parameter Re(epsilon'/epsilon) has been made using the full E731 data set. We find Re(epsilon'/epsilon) = (7.4 +/- 5.2 +/- 2.9) x 10(-4) where the first error is statistical and the second systematic. C1 UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637. ELMHURST COLL,ELMHURST,IL 60126. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. CENS,DEPT PHYS PARTICULES ELEMENTAIRES,F-91191 GIF SUR YVETTE,FRANCE. RP GIBBONS, LK (reprint author), UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637, USA. RI Briere, Roy/N-7819-2014 OI Briere, Roy/0000-0001-5229-1039 NR 17 TC 238 Z9 238 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 MAR 1 PY 1993 VL 70 IS 9 BP 1203 EP 1206 DI 10.1103/PhysRevLett.70.1203 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700005 ER PT J AU ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, MD DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, M FAST, JE GIANOLI, A GINSBURG, CM GOLLWITZER, KE HAHN, AA HASAN, MA HSUEH, SY LEWIS, RA LUPPI, E MACRI, M MAJEWSKA, A MANDELKERN, MA MARCHETTO, F MARINELLI, M MARQUES, JL MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PALLAVICINI, M PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, PA RAY, RE REID, JD RINAUDO, G ROCCUZZO, B ROSEN, JL SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, SJ ZHANG, Y ZHAO, JL ZIOULAS, G AF ARMSTRONG, TA BETTONI, D BHARADWAJ, V BIINO, C BORREANI, G BROEMMELSIEK, D BUZZO, A CALABRESE, R CECCUCCI, A CESTER, R CHURCH, MD DALPIAZ, P DALPIAZ, PF DIBENEDETTO, R DIMITROYANNIS, D FABBRI, M FAST, JE GIANOLI, A GINSBURG, CM GOLLWITZER, KE HAHN, AA HASAN, MA HSUEH, SY LEWIS, RA LUPPI, E MACRI, M MAJEWSKA, A MANDELKERN, MA MARCHETTO, F MARINELLI, M MARQUES, JL MARSH, W MARTINI, M MASUZAWA, M MENICHETTI, E MIGLIORI, A MUSSA, R PALESTINI, S PALLAVICINI, M PASTRONE, N PATRIGNANI, C PEOPLES, J PESANDO, L PETRUCCI, F PIA, MG PORDES, S RAPIDIS, PA RAY, RE REID, JD RINAUDO, G ROCCUZZO, B ROSEN, JL SANTRONI, A SARMIENTO, M SAVRIE, M SCALISI, A SCHULTZ, J SETH, KK SMITH, A SMITH, GA SOZZI, M TROKENHEIM, S WEBER, MF WERKEMA, SJ ZHANG, Y ZHAO, JL ZIOULAS, G TI PROTON ELECTROMAGNETIC FORM-FACTORS IN THE TIME-LIKE REGION FROM 8.9 TO 13.0 GEV(2) SO PHYSICAL REVIEW LETTERS LA English DT Article ID ALUMINIZED MYLAR TUBES; QUANTUM CHROMODYNAMICS; EXCLUSIVE PROCESSES; MOMENTUM-TRANSFER; CHARGE DIVISION; CALORIMETER; CHAMBER; FERMILAB-E760 AB Cross sections for the reaction ppBAR --> e+e- have been measured at s = 8.9, 12.4, and 13.0 GeV2. The cross sections have been analyzed to obtain the proton electromagnetic form factors in the timelike region. We find that G(M)(q2) is-proportional-to q-4alpha(s)2(q2) for q2 greater-than-or-equal-to 5 (GeV/c)2. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. INFN,I-44100 FERRARA,ITALY. UNIV FERRARA,I-44100 FERRARA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV GENOA,I-16146 GENOA,ITALY. UNIV CALIF IRVINE,IRVINE,CA 92717. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV TURIN,I-10125 TURIN,ITALY. RP ARMSTRONG, TA (reprint author), PENN STATE UNIV,UNIV PK,PA 16802, USA. RI Pia, Maria Grazia/C-7034-2012; Sozzi, Marco/H-1674-2011; Patrignani, Claudia/C-5223-2009; Luppi, Eleonora/A-4902-2015; Calabrese, Roberto/G-4405-2015; Pallavicini, Marco/G-5500-2012; Gianoli, Alberto/H-5544-2015 OI Mussa, Roberto/0000-0002-0294-9071; Pia, Maria Grazia/0000-0002-3579-9639; Sozzi, Marco/0000-0002-2923-1465; Patrignani, Claudia/0000-0002-5882-1747; Luppi, Eleonora/0000-0002-1072-5633; Calabrese, Roberto/0000-0002-1354-5400; Pallavicini, Marco/0000-0001-7309-3023; Gianoli, Alberto/0000-0002-2456-8667 NR 27 TC 98 Z9 100 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 MAR 1 PY 1993 VL 70 IS 9 BP 1212 EP 1215 DI 10.1103/PhysRevLett.70.1212 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700007 ER PT J AU BARABANOV, AL SHARAPOV, EI SKOY, VR FRANKLE, CM AF BARABANOV, AL SHARAPOV, EI SKOY, VR FRANKLE, CM TI TESTING T-ODD, P-EVEN INTERACTIONS WITH GAMMA-RAYS FROM NEUTRON P-WAVE RESONANCES SO PHYSICAL REVIEW LETTERS LA English DT Article ID PARITY NONCONSERVATION; SCATTERING; VIOLATION; NUCLEI AB A new method for the study of time reversal violation is described. It consists of measurements of the forward-backward asymmetry in individual gamma-ray transitions resulting from unpolarized neutron capture in p-wave resonances. An experiment with a Cd-113 target performed at the Dubna pulsed neutron source has been analyzed and a limit on the time reversal odd, parity even interaction extracted. The possibility of experiments using the powerful pulsed neutron source at Los Alamos is considered. C1 JOINT INST NUCL RES,149981 DUBNA,RUSSIA. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BARABANOV, AL (reprint author), IV KURCHATOV INST,123182 MOSCOW,RUSSIA. NR 22 TC 11 Z9 11 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 MAR 1 PY 1993 VL 70 IS 9 BP 1216 EP 1219 DI 10.1103/PhysRevLett.70.1216 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700008 ER PT J AU GRONBECHJENSEN, N BLACKBURN, JA AF GRONBECHJENSEN, N BLACKBURN, JA TI HYPERRADIANCE FROM PHASE-LOCKED SOLITON OSCILLATORS SO PHYSICAL REVIEW LETTERS LA English DT Article ID COUPLED JOSEPHSON-JUNCTIONS; DYNAMICS; ARRAYS; LOCKING; SYSTEMS AB We show that the power emitted from phase-locked soliton oscillators can exceed the upper limit given by the theory for superradiance from phase-locked point oscillators. As an experimentally relevant example, we consider two magnetically coupled long Josephson junctions, operated in single-fluxon modes. Analytical results indicate that the coupling between the two oscillators enables the phase-locked modes to localize in space thereby creating the possibility of an enhancement of the power level beyond the point-oscillator limit. Good agreement is found between analytical results and numerical simulations, and with recently published experimental data. C1 WILFRID LAURIER UNIV,DEPT PHYS & COMP,WATERLOO N2L 3C5,ONTARIO,CANADA. RP GRONBECHJENSEN, N (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 16 TC 28 Z9 28 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 MAR 1 PY 1993 VL 70 IS 9 BP 1251 EP 1254 DI 10.1103/PhysRevLett.70.1251 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700017 ER PT J AU HAMMEL, BA KEANE, CJ CABLE, MD KANIA, DR KILKENNY, JD LEE, RW PASHA, R AF HAMMEL, BA KEANE, CJ CABLE, MD KANIA, DR KILKENNY, JD LEE, RW PASHA, R TI X-RAY SPECTROSCOPIC MEASUREMENTS OF HIGH-DENSITIES AND TEMPERATURES FROM INDIRECTLY DRIVEN INERTIAL CONFINEMENT FUSION CAPSULES SO PHYSICAL REVIEW LETTERS LA English DT Article ID DENSE-PLASMAS; LINE-SHAPES; IMPLOSIONS; SPECTRA; ARGON; MODEL AB Time-resolved x-ray spectroscopy is used to study the implosion of indirectly driven inertial confinement fusion capsules on the Nova laser. Through the use of Ar dopant in the fuel, measurements of the peak temperature, from emission line ratios, and density, from line broadening, are obtained. These measurements indicate peak electron temperatures of approximately 1-1.6 keV and electron and deuteron densities in the range of (1.0-2.0) x 10(24) cm-3, depending on the type of laser drive used. These ion densities, which approach those of stellar interiors, are the highest inferred by direct analysis of Stark-broadened line profiles. RP HAMMEL, BA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 97 Z9 106 U1 0 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 MAR 1 PY 1993 VL 70 IS 9 BP 1263 EP 1266 DI 10.1103/PhysRevLett.70.1263 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700020 ER PT J AU DALEY, RS FELTER, TE HILDNER, ML ESTRUP, PJ AF DALEY, RS FELTER, TE HILDNER, ML ESTRUP, PJ TI STRUCTURAL-CHANGES IN THE MO(100) RECONSTRUCTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID W(001) SURFACE; PHASE-TRANSITIONS; MO(001) SURFACE; ION-SCATTERING; DIFFRACTION; H/MO(100); LEED AB The clean Mo(100) surface reconstructs at low temperature forming a commensurate c(7 square-root 2 x square-root 2)R45-degrees displacement wave. LEED studies over the range 10 to 300 K reveal a change in the harmonic content of this wave at intermediate temperatures corresponding to a sharpening of antiphase domain walls as T is lowered. Simultaneously, a selection of one of two possible domain orientations occurs if steps are present. The process shows no hysteresis and permits the equilibrium distribution to be observed. C1 BROWN UNIV,PROVIDENCE,RI 02912. RP DALEY, RS (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94550, USA. NR 30 TC 19 Z9 19 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 MAR 1 PY 1993 VL 70 IS 9 BP 1295 EP 1298 DI 10.1103/PhysRevLett.70.1295 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700028 ER PT J AU LADD, AJC AF LADD, AJC TI SHORT-TIME MOTION OF COLLOIDAL PARTICLES - NUMERICAL-SIMULATION VIA A FLUCTUATING LATTICE-BOLTZMANN EQUATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID GAS CELLULAR AUTOMATA; HYDRODYNAMIC INTERACTIONS; BROWNIAN-MOTION; SELF-DIFFUSION; SUSPENSION; DYNAMICS AB A new and general technique for simulating solid-fluid suspensions, which combines molecular dynamics for the solid particles with a lattice-Boltzmann model for the fluid, is described. The many-body hydrodynamic interactions are fully accounted for, both for small particle velocities and at higher Reynolds numbers. Brownian motion of the solid particles is included by adding a fluctuating component to the fluid stress tensor. Simulations of the dynamics of colloidal particles at short times compare favorably with recent diffusing-wave spectroscopy experiments. RP LADD, AJC (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 18 TC 170 Z9 171 U1 1 U2 27 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 MAR 1 PY 1993 VL 70 IS 9 BP 1339 EP 1342 DI 10.1103/PhysRevLett.70.1339 PG 4 WC Physics, Multidisciplinary SC Physics GA KN887 UT WOS:A1993KN88700039 ER PT J AU COOK, DR FLYNN, WG MOREHEAD, JJ KAUFMAN, AN AF COOK, DR FLYNN, WG MOREHEAD, JJ KAUFMAN, AN TI PHASE-SPACE ACTION CONSERVATION FOR NON-EIKONAL WAVE FIELDS SO PHYSICS LETTERS A LA English DT Article ID LINEAR-MODE-CONVERSION; ELECTROMAGNETIC-WAVES; FORMULATION AB We derive a local phase-space wave-action conservation law, valid for non-eikonal wave fields for which the medium and/or the wave amplitudes have rapid spatial variation. This six-dimensional conservation law leads to conservation laws on three-dimensional subspaces. The law is covariant under linear canonical transformations of phase-space, and under congruent transformations of the multi-component wave field. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP COOK, DR (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 15 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD MAR 1 PY 1993 VL 174 IS 1-2 BP 53 EP 58 DI 10.1016/0375-9601(93)90541-7 PG 6 WC Physics, Multidisciplinary SC Physics GA KP950 UT WOS:A1993KP95000010 ER PT J AU TARTAKOVSKI, AV AF TARTAKOVSKI, AV TI CONDUCTIVITY FLUCTUATIONS AND THE SUPERLINEAR CURRENT VOLTAGE CHARACTERISTIC IN ONE-DIMENSIONAL DISORDERED-SYSTEMS SO PHYSICS LETTERS A LA English DT Article ID UNIVERSAL CONDUCTANCE FLUCTUATIONS; FINITE-TEMPERATURE; MAGNETIC-FIELD; METAL AB The current-voltage (I-V) characteristic of a one-dimensional (1D) specimen in the strong localization regime is considered. The conductivity of such a specimen is a non-self-averaged quantity since its average value is exponentially larger than the typical one. A finite voltage difference introduces energy averaging that leads to the superlinear I-V curve with gigantic mesoscopic fluctuations. The typical current values and the scale of fluctuations with respect to the current and the voltage are obtained. RP TARTAKOVSKI, AV (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 22 TC 3 Z9 3 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 MAR 1 PY 1993 VL 174 IS 1-2 BP 133 EP 138 DI 10.1016/0375-9601(93)90556-F PG 6 WC Physics, Multidisciplinary SC Physics GA KP950 UT WOS:A1993KP95000025 ER PT J AU HOSOKAWA, I AF HOSOKAWA, I TI ASYMPTOTIC FRACTAL AND MULTIFRACTAL PROPERTIES OF TURBULENT DISSIPATIVE FIELDS - COMMENT SO PHYSICS LETTERS A LA English DT Note AB General solutions of Bershadskii and Tsinober's inequality for generalized dimensions D(q) of a multifractal are given. It is proved that all scale-similar (and statistically homogeneous) measures with finite qth order moments even for q negative have a D(q) satisfying the inequality for all q. RP HOSOKAWA, I (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B-258,LOS ALAMOS,NM 87545, USA. NR 6 TC 5 Z9 5 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 MAR 1 PY 1993 VL 174 IS 1-2 BP 176 EP 177 DI 10.1016/0375-9601(93)90565-H PG 2 WC Physics, Multidisciplinary SC Physics GA KP950 UT WOS:A1993KP95000034 ER PT J AU SHAING, KC CHRISTENSON, PJ AF SHAING, KC CHRISTENSON, PJ TI ION COLLISIONALITY AND L-H TRANSITION IN TOKAMAKS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Letter ID EDGE ELECTRIC-FIELD; POLOIDAL ROTATION; MODE; PLASMAS AB When the previous H-mode theory [K. C. Shaing and E. C. Crume, Jr., Phys. Rev. Lett. 63, 2369 (1989)] is extended to include a bi-Maxwellian ion distribution with both cold and hot ion components to model the effects of the non-Maxwellian distribution, the collisionality of the cold ions nu*i(c) becomes an irrelevant bifurcation parameter, as it is for the electrode-induced H mode. Thus, the observation that the L-H transition can occur even when nu*i(c) much greater than 1 is consistent with the fundamental physics of the ion orbit loss model, including a hot ion component. RP SHAING, KC (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 19 TC 16 Z9 16 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1993 VL 5 IS 3 BP 666 EP 668 DI 10.1063/1.860511 PG 3 WC Physics, Fluids & Plasmas SC Physics GA KR123 UT WOS:A1993KR12300002 ER PT J AU DORLAND, W HAMMETT, GW AF DORLAND, W HAMMETT, GW TI GYROFLUID TURBULENCE MODELS WITH KINETIC EFFECTS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID GYROKINETIC PARTICLE SIMULATION; GRADIENT-DRIVEN TURBULENCE; 4-FIELD MODEL; TEMPERATURE; PLASMA; INSTABILITY; SPECTRUM; WAVES AB Nonlinear gyrofluid equations are derived by taking moments of the nonlinear, electrostatic gyrokinetic equation. The principal model presented includes evolution equations for the guiding center n, u(parallel-to), T(parallel-to), and T(perpendicular-to) along with an equation expressing the quasineutrality constraint. Additional evolution equations for higher moments are derived that may be used if greater accuracy is desired. The moment hierarchy is closed with a Landau damping model [G. W. Hammett and F. W. Perkins, Phys. Rev. Lett. 64, 3019 (1990)], which is equivalent to a multipole approximation to the plasma dispersion function, extended to include finite Larmor radius effects (FLR). In particular, new dissipative, nonlinear terms are found that model the perpendicular phase mixing of the distribution function along contours of constant electrostatic potential. These ''FLR phase-mixing'' terms introduce a hyperviscositylike damping is-proportional-to k(perpendicular-to)2 \PHI(k)k x k'\, which should provide a physics-based damping mechanism at high k(perpendicular-to) rho which is potentially as important as the usual polarization drift nonlinearity. The moments are taken in guiding center space to pick up the correct nonlinear FLR terms and the gyroaveraging of the shear. The equations are solved with a nonlinear, three-dimensional initial value code. Linear results are presented, showing excellent agreement with linear gyrokinetic theory. RP DORLAND, W (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. RI Hammett, Gregory/D-1365-2011; Dorland, William/B-4403-2009 OI Hammett, Gregory/0000-0003-1495-6647; Dorland, William/0000-0003-2915-724X NR 41 TC 212 Z9 212 U1 0 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1993 VL 5 IS 3 BP 812 EP 835 DI 10.1063/1.860934 PG 24 WC Physics, Fluids & Plasmas SC Physics GA KR123 UT WOS:A1993KR12300015 ER PT J AU HORTON, W LINDBERG, D KIM, JY DONG, JQ HAMMETT, GW SCOTT, SD ZARNSTORFF, MC HAMAGUCHI, S AF HORTON, W LINDBERG, D KIM, JY DONG, JQ HAMMETT, GW SCOTT, SD ZARNSTORFF, MC HAMAGUCHI, S TI ION-TEMPERATURE-GRADIENT-DRIVEN TRANSPORT IN A DENSITY MODIFICATION EXPERIMENT ON THE TOKAMAK FUSION TEST REACTOR - REPLY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note ID TFTR TOKAMAK; MOMENTUM; HEAT C1 PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP HORTON, W (reprint author), UNIV TEXAS,INST FUS STUDIES,AUSTIN,TX 78712, USA. RI Hammett, Gregory/D-1365-2011 OI Hammett, Gregory/0000-0003-1495-6647 NR 12 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1993 VL 5 IS 3 BP 1034 EP 1035 DI 10.1063/1.860508 PG 2 WC Physics, Fluids & Plasmas SC Physics GA KR123 UT WOS:A1993KR12300038 ER PT J AU MAHAUX, C DAVIES, KTR SATCHLER, GR AF MAHAUX, C DAVIES, KTR SATCHLER, GR TI RETARDATION AND DISPERSIVE EFFECTS IN THE NUCLEAR MEAN-FIELD SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID COULOMB BARRIER; SEPARABLE REPRESENTATION; EFFECTIVE MASS; FREE-PATH; MODEL; PB-208; POTENTIALS; SCATTERING; ENERGIES; SHELL AB The one-body potential which represents the average interaction between a particle and a medium depends upon energy. This is equivalent to a nonlocality in time. The energy dependence and the nonlocality in time are connected by a Fourier transform. The temporal nonlocality is a retardation effect because it entails that the wave function at time t is influenced only by its values at other times which must be prior to t. This reflects a causality property. We investigate the temporal nonlocality of the nuclear mean field. A comparison is made with the temporal nonlocality of the relation between the electric displacement and the electric field in classical electrodynamics. We consider several parametrizations of the energy dependence of the imaginary part of the mean field, for nucleons as well as heavy ions. These parametrizations specify the energy dependence of the corresponding real part, because the real and imaginary parts are connected by a dispersion relation. The latter can be viewed as equivalent to the causality property. Since Hilbert transforms appear in the dispersion relation and since Fourier transforms give the correspondence between energy dependence and temporal nonlocality, we derive several properties of these transforms which are of particular interest in the present context. The most useful one is that the Fourier transform of a function F(E) which is analytic in the upper half of the complex E-plane can be expressed in terms of the Fourier transform of the imaginary part of F(E) alone. We investigate several schematic models for the mean field. They fall into two main categories. These correspond to the two main definitions which have been proposed for the mean field, namely the self-energy and Feshbach's potential. Both of these definitions can be used for the nucleon-nucleus system, in which case they correspond to two different ways of handling the combined influence of ground state correlations and antisymmetrization. The resulting two mean fields have different energy dependences and, correspondingly, temporal nonlocalities. Feshbach's approach can also be applied to the nucleus-nucleus system. Our schematic models are semi-realistic, in the sense that they all take account of the ''Fermi surface anomaly'' for the nucleon-nucleus system or of the ''threshold anomaly'' for the nucleus-nucleus case. The temporal nonlocality is investigated for each model. A physical interpretation of this nonlocality is given in terms of a time delay of the response of the medium, in which an incident wave is partially trapped in nonelastic channels and subsequently reemitted. This interpretation is buttressed by the form of the continuity equation in the presence of an energy-dependent mean field. C1 OAK RIDGE NATL LAB,DIV PHYS,OAK RIDGE,TN 37831. RP MAHAUX, C (reprint author), STATE UNIV LIEGE,INST PHYS B5,B-4000 LIEGE,BELGIUM. NR 78 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD MAR PY 1993 VL 224 IS 5-6 BP 237 EP 360 DI 10.1016/0370-1573(93)90017-8 PG 124 WC Physics, Multidisciplinary SC Physics GA LA429 UT WOS:A1993LA42900001 ER PT J AU THOMA, S KANEKO, Y SOMERVILLE, C AF THOMA, S KANEKO, Y SOMERVILLE, C TI A NONSPECIFIC LIPID TRANSFER PROTEIN FROM ARABIDOPSIS IS A CELL-WALL PROTEIN SO PLANT JOURNAL LA English DT Article ID PHOSPHOLIPID TRANSFER PROTEINS; AMINO-ACID-SEQUENCE; LEAF-SPECIFIC THIONINS; FULL-LENGTH CDNA; INTRACELLULAR EXCHANGE; MAIZE SEEDLINGS; BARLEY; EXPRESSION; GENE; MITOCHONDRIA AB Lipid transfer proteins (LTPs), mediate the transfer of phospholipids between membranes in vitro. However, the in vivo function of LTPs is not known. To determine the precise location of a non-specific LTP from Arabidopsis, a cDNA clone was used to produce an Arabidopsis LTP:protein A fusion. Antibodies raised against the fusion were used to localize the Arabidopsis LTP by immunoelectron microscopy. LTP was found to be located in the cell wall, mainly in epidermal cells. This location appears to be inconsistent with the proposed role of the protein in intracellular lipid transfer. C1 MICHIGAN STATE UNIV,DOE,PLANT RES LAB,E LANSING,MI 48824. SAITAMA UNIV,DEPT REGULAT BIOL,URAWA,SAITAMA 338,JAPAN. RI Somerville, Christopher/A-4048-2009; Kaneko, Yasuko/F-9376-2015 OI Somerville, Christopher/0000-0003-4647-0094; NR 33 TC 162 Z9 169 U1 0 U2 8 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0960-7412 J9 PLANT J JI Plant J. PD MAR PY 1993 VL 3 IS 3 BP 427 EP 436 DI 10.1046/j.1365-313X.1993.t01-21-00999.x PG 10 WC Plant Sciences SC Plant Sciences GA KV327 UT WOS:A1993KV32700007 PM 8220451 ER PT J AU SAUERS, I CHRISTOPHOROU, LG SPYROU, SM AF SAUERS, I CHRISTOPHOROU, LG SPYROU, SM TI NEGATIVE-ION FORMATION IN COMPOUNDS RELEVANT TO SF6 DECOMPOSITION IN ELECTRICAL DISCHARGES SO PLASMA CHEMISTRY AND PLASMA PROCESSING LA English DT Article DE NEGATIVE IONS; ELECTRON ATTACHMENT; DISSOCIATIVE ELECTRON ATTACHMENT; NEGATIVE ION LIFETIMES, TIME-OF-FLIGHT MASS SPECTROMETRY; SF6 DECOMPOSITION PRODUCTS; SF6, SF4, SOF2, SO2F2, SOF4, SO2, SIF4 ID CROSS-SECTIONS; DISSOCIATIVE ATTACHMENT; SULFUR-HEXAFLUORIDE; SPARK BREAKDOWN; MIXTURES; SO2; ENERGIES; PLASMAS; IONIZATION; SOF2 AB Dissociative and nondissociative electron attachment in the electron impact energy range 0-14 eV are reported for SOF2, SOF4, SOF2, SF4, SO2, and SiF4 compounds which can be formed by electrical discharges in SF6. The electron energy dependences of the mass-identified negative ions were determined in a time-of-flight mass spectrometer. The ions studied include F- and SOF2-* from SOF2; SOF3- and F from SOF4; SO2F2-*, SO2F-, F2-, and F- from SO2F2; SF4-* and F- from SF4; O-, SO-, and S- from SO2; and SiF3- and F- from SiF4. Thermochemical data have been determined from the threshold energies of some of the fragment negative ions. Lifetimes of the anions SOF2-*, SO2F2-*, and SF4-* are also reported. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP SAUERS, I (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 46 TC 28 Z9 29 U1 1 U2 17 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4324 J9 PLASMA CHEM PLASMA P JI Plasma Chem. Plasma Process. PD MAR PY 1993 VL 13 IS 1 BP 17 EP 35 DI 10.1007/BF01447168 PG 19 WC Engineering, Chemical; Physics, Applied; Physics, Fluids & Plasmas SC Engineering; Physics GA KP074 UT WOS:A1993KP07400002 ER PT J AU BUSS, RJ HO, P WEBER, ME AF BUSS, RJ HO, P WEBER, ME TI LASER STUDIES OF THE REACTIVITY OF SIO WITH THE SURFACE OF A DEPOSITING FILM SO PLASMA CHEMISTRY AND PLASMA PROCESSING LA English DT Article DE GAS-SURFACE REACTIONS; IRIS TECHNIQUE; SIO PLASMA FILM DEPOSITION ID CHEMICAL VAPOR-DEPOSITION; SILANE OXYGEN MIXTURES; INDUCED FLUORESCENCE; SILICON MONOXIDE; SI(100) SURFACE; ATOMIC OXYGEN; REAL-TIME; MOLECULES; DECOMPOSITION; SCATTERING AB The reactivity of SiO produced in a SiCl4/02 plasma with the surface of a depositing silicon oxide film has been measured to be near zero for surface temperatures of 25-500-degrees-C using the IRIS technique (imaging of radicals interacting with surfaces). This method combines spatially resolved laser-induced fluorescence with molecular beam techniques. The SiO desorbs from the surface with a spatial distribution consistent with a cosine angular distribution. C1 TEXAS INSTRUMENTS INC,DALLAS,TX 75265. RP BUSS, RJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 41 TC 16 Z9 16 U1 2 U2 6 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0272-4324 J9 PLASMA CHEM PLASMA P JI Plasma Chem. Plasma Process. PD MAR PY 1993 VL 13 IS 1 BP 61 EP 76 DI 10.1007/BF01447170 PG 16 WC Engineering, Chemical; Physics, Applied; Physics, Fluids & Plasmas SC Engineering; Physics GA KP074 UT WOS:A1993KP07400004 ER PT J AU PHILLIPS, CK HOULBERG, W HWANG, DQ ATTENBERGER, S TOLLIVER, J HIVELY, L AF PHILLIPS, CK HOULBERG, W HWANG, DQ ATTENBERGER, S TOLLIVER, J HIVELY, L TI PREDICTIVE TRANSPORT MODELING OF ICRF-HEATED TOKAMAKS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID TFTR EXPERIMENTS; PLASMAS; WAVES; SIMULATIONS AB In tokamaks heated with ICRF power, the time evolution of the resonant minority ion population can have a profound influence on the power deposition in the plasma, particularly in the limit when the fast-ion slowing-down time is comparable with or longer than the period of other time-dependent phenomena in the discharge, such as sawtooth oscillations, which can alter the distribution of the fast ions. In order to properly include this effect in transport simulations of ICRF-heated tokamak discharges, a time-dependent predictive transport and heating code has been developed by integrating the WHIST 2D MHD equilibrium/ID flux-surface-averaged transport code with the RAZE hybrid ray-tracing/Fokker-Planck ICRF heating code. The package has three distinguishing features: (i) the wave propagation and damping calculations are evaluated using a numerical solution for the instantaneous plasma equilibrium which is self-consistently evolved in time, accounting for energy, particle and magnetic diffusion in the presence of intense auxiliary heating; (ii) the wave absorption is calculated on the basis of the combined effects of RF-driven quasilinear diffusion and collisional thermalization, and therefore includes heating due to all resonant processes in the plasma; and (iii) the time evolution of the minority distribution function is explicitly retained by solving the time dependent Fokker-Planck equation in the isotropic limit. Simulations obtained with the code for high-power ICRF heating experiments in PLT show excellent agreement between the calculated and measured rate of central electron heating. Performance projections obtained for ICRF-heated plasmas in BPX indicate that the fusion gain, Q, exceeds 5 even if the best confinement achievable in the device is limited to the L-mode regime. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP PHILLIPS, CK (reprint author), PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543, USA. NR 47 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD MAR PY 1993 VL 35 IS 3 BP 301 EP 317 DI 10.1088/0741-3335/35/3/003 PG 17 WC Physics, Fluids & Plasmas SC Physics GA LG959 UT WOS:A1993LG95900003 ER PT J AU GUILINGER, TR VOYTKO, JE WHITE, RE YIN, KM AF GUILINGER, TR VOYTKO, JE WHITE, RE YIN, KM TI CHARACTERIZATION OF AMORPHOUS NI-CR-P ELECTRODEPOSITS SO PLATING AND SURFACE FINISHING LA English DT Article ID CHROMIUM; NICKEL; ALLOYS; PHOSPHORUS; MOLYBDENUM; BEHAVIOR; TUNGSTEN AB A plating bath was developed to deposit adherent, pore-free, low-stress, amorphous Ni-Cr-P alloys. Alloys containing more than 10 atomic percent Cr demonstrated outstanding corrosion resistance in both pitting and non-pitting electrolytes when compared to crystalline Ni, amorphous Ni-P, 304 stainless steel, and Hastelloy C-276. C1 SANDIA NATL LABS,CTR TECHNOL TRANSFER & IND RELAT,ALBUQUERQUE,NM 87185. TEXAS A&M UNIV SYST,CTR ELECTROCHEM ENGN,DEPT CHEM ENGN,COLL STN,TX 77843. RP GUILINGER, TR (reprint author), SANDIA NATL LABS,DEPT CERAM PROC SCI,POB 5800,ALBUQUERQUE,NM 87185, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD MAR PY 1993 VL 80 IS 3 BP 46 EP 50 PG 5 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA LB291 UT WOS:A1993LB29100014 ER PT J AU THOMASSEN, KI AF THOMASSEN, KI TI PROGRESS IN MAGNETIC FUSION ENERGY RESEARCH SO PROCEEDINGS OF THE IEEE LA English DT Article AB Remarkable scientific progress has been made in the Magnetic Fusion Energy Program since its inception 40 years ago. A key energy confinement parameter reflecting that progress has been improved 10 000 000-fold in that time. A formalized international collaborative effort of design and development for a 1000-MW experimental reactor (ITER) has been entered into by the United States, Russia, Japan, and the European Community. In the United States, a national project to build a superconducting steady-state advanced tokamak (SSAT) to improve the reactor prospects of fusion is underway. [The device has been newly renamed the Tokamak Physics Experiment (TPX).] Despite this very encouraging progress, the outlook for fusion as an energy source remains unclear, with both economic and technological attractiveness yet to be determined. However, with only limited options for long-term energy supplies, and with environmental consequences yet to play a more dominant role in our choices, the world can ill afford not to develop the potential of fusion in the decades to come. RP THOMASSEN, KI (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,L-637,LIVERMORE,CA 94551, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9219 J9 P IEEE JI Proc. IEEE PD MAR PY 1993 VL 81 IS 3 BP 390 EP 398 DI 10.1109/5.241489 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA LH993 UT WOS:A1993LH99300008 ER PT J AU POST, RF FOWLER, TK POST, SF AF POST, RF FOWLER, TK POST, SF TI A HIGH-EFFICIENCY ELECTROMECHANICAL BATTERY SO PROCEEDINGS OF THE IEEE LA English DT Article AB In our increasingly electrified society there is a growing need for efficient cost-effective means for storing electrical energy. The electric auto is a prime example. Storage systems for the electric utilities, and for wind or solar power, are other examples. While electrochemical cells could in principle supply these needs, existing E-C batteries have well-known limitations. This article addresses an alternative-the electromechanical battery (EMB). An EMB is a modular unit consisting of an evacuated housing containing a fiber-composite rotor. The rotor is supported by magnetic bearings and contains an integrally mounted permanent magnet array. Recent developments in high-strength fibers, in permanent-magnet materials, and in solid-state power electronics open up new possibilities, allowing the design of small (1 kW-h) modular EMB's for full- or hybrid-electric vehicles, and larger size modules (25 kW-h), for a variety of stationary storage needs. The article addresses design issues for EMBs with rotors made up of nested cylinders. Issues addressed include: rotational stability, stress distributions, generator/motor power and efficiency, power conversion, and cost. An important conclusion; the use of EMB's in electric autos could result in a five-fold reduction (relative to the IC engine) in the primary energy input required for urban driving, with a concomitant major positive impact on our economy and on air pollution. C1 UNIV CALIF BERKELEY,DEPT ENGN,BERKELEY,CA 94720. CURTIS PMC,DUBLIN,CA 94568. RP POST, RF (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94550, USA. NR 38 TC 32 Z9 36 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9219 J9 P IEEE JI Proc. IEEE PD MAR PY 1993 VL 81 IS 3 BP 462 EP 474 DI 10.1109/5.241483 PG 13 WC Engineering, Electrical & Electronic SC Engineering GA LH993 UT WOS:A1993LH99300014 ER PT J AU PERCUS, JK PERCUS, OE PERELSON, AS AF PERCUS, JK PERCUS, OE PERELSON, AS TI PREDICTING THE SIZE OF THE T-CELL RECEPTOR AND ANTIBODY COMBINING REGION FROM CONSIDERATION OF EFFICIENT SELF NONSELF DISCRIMINATION SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE EPITOPES; SELF-NONSELF DISCRIMINATION ID 3-DIMENSIONAL STRUCTURE; IMMUNE NETWORK; REPERTOIRE; PEPTIDES; COMPLEX; IDENTIFICATION; RECOGNITION; PROTEIN AB The binding of antibody to antigen or T-cell receptor to major histocompatibility complex-peptide complex requires that portions of the two structures have complementary shapes that can closely approach each other. The question that we address here is how large should the complementary regions on the two structures be. The interacting regions are by necessity roughly the same size. To estimate the size (number of contact residues) of an optimal receptor combining region, we assume that the immune system over evolutionary time has been presented with a large random set of foreign molecules that occur on common pathogens, which it must recognize, and a smaller random set of self-antigens to which it must fail to respond. Evolutionarily, the receptors and the molecular groups that the immune system recognizes as epitopes are imagined to have coevolved to maximize the probability that this task is performed. The probability of a receptor matching a random antigen is estimated from this condition. Using a simple model for receptor-ligand interaction, we estimate that the optimal size binding region on immunoglobulin or T-cell receptors will contain about 15 contact residues, in agreement with experimental observation. C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. NYU,COURANT INST MATH SCI,NEW YORK,NY 10012. FU NIAID NIH HHS [AI28433] NR 27 TC 77 Z9 78 U1 1 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD MAR 1 PY 1993 VL 90 IS 5 BP 1691 EP 1695 DI 10.1073/pnas.90.5.1691 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KP979 UT WOS:A1993KP97900014 PM 7680474 ER PT J AU NICHOLLS, RD GOTTLIEB, W RUSSELL, LB DAVDA, M HORSTHEMKE, B RINCHIK, EM AF NICHOLLS, RD GOTTLIEB, W RUSSELL, LB DAVDA, M HORSTHEMKE, B RINCHIK, EM TI EVALUATION OF POTENTIAL MODELS FOR IMPRINTED AND NONIMPRINTED COMPONENTS OF HUMAN-CHROMOSOME 15Q11-Q13 SYNDROMES BY FINE-STRUCTURE HOMOLOGY MAPPING IN THE MOUSE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE CHROMOSOMAL DELETIONS; PINK-EYED DILUTION LOCUS; GENOMIC IMPRINTING; CONTIGUOUS GENE SYNDROMES; GAMMA-AMINOBUTYRIC ACID TYPE-A RECEPTORS ID PRADER-WILLI SYNDROME; REGION; GENE; DIAGNOSIS; DELETION; SUBUNIT; GABA AB Prader-Willi and Angelman syndromes are complex neurobehavioral contiguous gene syndromes whose expression depends on the unmasking of genomic imprinting for different genetic loci in human chromosome 15q11-q13. The homologous chromosomal region in the mouse genome has been fine-mapped by using interspecific (Mus spretus) crosses and overlapping, radiation-induced deletions to evaluate potential animal models for both imprinted and nonimprinted components of these syndromes. Four evolutionarily conserved sequences from human 15q11-q13, including two cDNAs from fetal brain (DN10, D15S12h, DN34, D15S9h-1), a microdissected clone (MN7; D15F37S1h) expressed in mouse brain, and the gene for the beta3 subunit of the gamma-aminobutyric acid type A receptor (Gabrb3), were mapped in mouse chromosome 7 by analysis of deletions at the pink-eyed dilution (p) locus. Three of these loci are deleted in pre- and postnatally lethal p-locus mutations, which extend up to 5.5 +/- 1.7 centimorgans (cM) proximal to p; D15S9h-1, which maps 1.1 +/- 0.8 cM distal to p and is the mouse homolog of the human gene D15S9 (which shows a DNA methylation imprint), is not deleted in any of the p-locus deletion series. A transcript from the Gabrb3 gene, but not the transcript detected by MN7 at the D15F37S1h locus, is expressed in mice homozygous for the p6H deletion, which have an abnormal neurological phenotype. Furthermore, the Gabrb3 transcript is expressed equally well from the maternal or paternal chromosome 7 and, therefore, its expression is not imprinted in mouse brain. Deletions at the mouse p locus should serve as intermediate genetic reagents and models with which to analyze the genetics and etiology of individual components of human 15q11-q13 disorders. C1 OAK RIDGE NATL LAB,DIV BIOL,POB 2009,OAK RIDGE,TN 37831. UNIV FLORIDA,INST BRAIN,DEPT NEUROSCI,GAINESVILLE,FL 32610. UNIV FLORIDA,COLL MED,DEPT PEDIAT,DIV GENET,GAINESVILLE,FL 32610. UNIV FLORIDA,COLL MED,CTR MAMMALIAN GENET,GAINESVILLE,FL 32610. UNIV ESSEN GESAMTHSCH KLINIKUM,INST HUMAN GENET,W-4300 ESSEN 1,GERMANY. NR 32 TC 73 Z9 73 U1 0 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD MAR 1 PY 1993 VL 90 IS 5 BP 2050 EP 2054 DI 10.1073/pnas.90.5.2050 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KP979 UT WOS:A1993KP97900087 PM 8095339 ER PT J AU KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K NOMURA, M TAJIMA, H YOSHIDA, S ARYAL, M DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M KAZUNO, M NIU, E SHIBUYA, H WATANABE, S OHTSUKA, I SATO, Y TEZUKA, I BAHK, SY KIM, SK AF KODAMA, K USHIDA, N MOKHTARANI, A PAOLONE, VS VOLK, JT WILCOX, JO YAGER, PM EDELSTEIN, RM FREYBERGER, AP GIBAUT, DB LIPTON, RJ NICHOLS, WR POTTER, DM RUSS, JS ZHANG, C ZHANG, Y JANG, HI KIM, JY KIM, TI LIM, IT PAC, MY BALLER, BR STEFANSKI, RJ NAKAZAWA, K CHUNG, KS CHUNG, SH KIM, DC PARK, IG PARK, MS SONG, JS YOON, CS CHIKAWA, M ABE, T FUJII, T FUJIOKA, G FUJIWARA, K FUKUSHIMA, H HARA, T TAKAHASHI, Y TARUMA, K TSUZUKI, Y YOKOYAMA, C CHANG, SD CHEON, BG CHO, JH KANG, JS KIM, CO KIM, KY KIM, TY LEE, JC LEE, SB LIM, GY NAM, SW SHIN, TS SIM, KS WOO, JK ISOKANE, Y TSUNEOKA, Y AOKI, S GAUTHIER, A HOSHINO, K KITAMURA, H KOBAYASHI, M MIYANISHI, M NAKAMURA, K NAKAMURA, M NAKAMURA, Y NAKANISHI, S NIU, K NIWA, K NOMURA, M TAJIMA, H YOSHIDA, S ARYAL, M DUNLEA, JM FREDERIKSEN, SG KURAMATA, S LUNDBERG, BG OLEYNIK, GA REAY, NW REIBEL, K SIDWELL, RA STANTON, NR MORIYAMA, K SHIBATA, H KALBFLEISCH, GR SKUBIC, P SNOW, JM WILLIS, SE KUSUMOTO, O NAKAMURA, K OKUSAWA, T TERANAKA, M TOMINAGA, T YOSHIDA, T YUUKI, H OKABE, H YOKOTA, J ADACHI, M KAZUNO, M NIU, E SHIBUYA, H WATANABE, S OHTSUKA, I SATO, Y TEZUKA, I BAHK, SY KIM, SK TI MEASUREMENT OF THE LIFETIMES OF CHARGED AND NEUTRAL BEAUTY HADRONS SO PROGRESS OF THEORETICAL PHYSICS LA English DT Article ID B-HADRONS; PARTICLES; DECAYS; MESONS; NUCLEI AB We report on the characteristics of 9 bbBAR pair events produced by a 600 GeV/c pi- beam and detected in the hybrid emulsion spectrometer of Fermilab experiment E653. The measured lifetimes for samples of 12 neutral and 6 charged beauty hadrons are tau(b0)=0.81+0.34+0.08/-0.22-0.02 ps, and tau(b+/-)=3.84+2.73+0.80/-1.36-0.16 ps. C1 UNIV CALIF DAVIS, DAVIS, CA 95616 USA. CHONNAM NATL UNIV, KWANGJU 500757, SOUTH KOREA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. GYEONGSANG NATL UNIV, JINJU 660300, SOUTH KOREA. KOREA UNIV, SEOUL 136701, SOUTH KOREA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. GIFU UNIV, GIFU 500, JAPAN. KINKI UNIV, OSAKA, OSAKA 577, JAPAN. KOBE UNIV, KOBE 657, JAPAN. RP KODAMA, K (reprint author), AICHI UNIV EDUC, KARIYA 448, JAPAN. RI Aoki, Shigeki/L-6044-2015; OI Russ, James/0000-0001-9856-9155 NR 32 TC 5 Z9 5 U1 0 U2 0 PU KYOTO UNIV PI KYOTO PA YUKAWA HALL PROGRESS THEORETICAL PHYSICS, KYOTO 606-01, JAPAN SN 0033-068X J9 PROG THEOR PHYS JI Prog. Theor. Phys. PD MAR PY 1993 VL 89 IS 3 BP 679 EP 696 PG 18 WC Physics, Multidisciplinary SC Physics GA KW415 UT WOS:A1993KW41500007 ER PT J AU PAULSEN, MD FILIPOVIC, D SLIGAR, SG ORNSTEIN, RL AF PAULSEN, MD FILIPOVIC, D SLIGAR, SG ORNSTEIN, RL TI CONTROLLING THE REGIOSPECIFICITY AND COUPLING OF CYTOCHROME P450CAM - T185F MUTANT INCREASES COUPLING AND ABOLISHES 3-HYDROXYNORCAMPHOR PRODUCT SO PROTEIN SCIENCE LA English DT Article DE MOLECULAR DYNAMICS SIMULATIONS; PROTEIN ENGINEERING; RATIONAL ENZYME REDESIGN ID MOLECULAR-DYNAMICS SIMULATION; PSEUDOMONAS-PUTIDA; ELECTRON-TRANSFER; ESCHERICHIA-COLI; PROTEIN; HYDROXYLATION; PUTIDAREDOXIN; P-450CAM; CRYSTAL; GENE AB Cytochrome P450cam (P450CIA1) catalyzes the hydroxylation of camphor and several substrate analogues such as norcamphor and 1-methyl-norcamphor. Hydroxylation was found experimentally at the 3, 5, and 6 positions of norcamphor, but only at the 5 and 6 positions of 1-methyl-norcamphor. In the catalytic cycle, the hydroxylation of substrate is coupled to the consumption of NADH. For camphor, the degree of coupling is 100%, but for both norcamphor and 1-methyl-norcamphor, the efficiency is dramatically lowered to 12% and 50%, respectively. Based on an examination of the active site of P450cam, it appeared that mutating position 185 might dramatically alter the product specificity and coupling of hydroxylation of norcamphor by P450cam. Analysis of molecular dynamics trajectories of norcamphor bound to the T185F mutant of cytochrome P450cam predicted that hydroxylation at the 3 position should be abolished and that the coupling should be dramatically increased. This mutant was constructed and the product profile and coupling experimentally determined. The coupling was doubled, and hydroxylation at the 3 position was essentially abolished. Both of these results are in agreement with the prediction. C1 PACIFIC NW LAB,MOLEC SCI RES CTR,POB 999, MAIL STOP K1-95, RICHLAND, WA 99352 USA. UNIV ILLINOIS, DEPT BIOCHEM, URBANA, IL 61801 USA. UNIV ILLINOIS, BECKMAN INST, URBANA, IL 61801 USA. FU NIGMS NIH HHS [GM 31756, GM 33775] NR 43 TC 29 Z9 29 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD MAR PY 1993 VL 2 IS 3 BP 357 EP 365 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KP464 UT WOS:A1993KP46400008 PM 8453374 ER PT J AU WENG, XW LUECKE, H SONG, IS KANG, DS KIM, SH HUBER, R AF WENG, XW LUECKE, H SONG, IS KANG, DS KIM, SH HUBER, R TI CRYSTAL-STRUCTURE OF HUMAN ANNEXIN-I AT 2.5 ANGSTROM RESOLUTION SO PROTEIN SCIENCE LA English DT Article DE ANNEXIN; CALCIUM BINDING PROTEIN; CRYSTAL STRUCTURE; LIPOCORTIN; PHOSPHOLIPASE INHIBITOR ID CA-2+-DEPENDENT PHOSPHOLIPID-BINDING; LIPOCORTIN-I; MACROMOLECULAR CRYSTALLOGRAPHY; WEISSENBERG CAMERA; MEMBRANE-BINDING; CALCIUM; PHOSPHORYLATION; REFINEMENT; IDENTIFICATION; DIVERSITY AB cDNA coding for N-terminally truncated human annexin I, a member of the family of Ca2+-dependent phospholipid binding proteins, has been cloned and expressed in Escherichia coli. The expressed protein is biologically active, and has been purified and crystallized in space group P2(1)2(1)2(1) with cell dimensions a = 139.36 angstrom, b = 67.50 angstrom, and c = 42.11 angstrom. The crystal structure has been determined by molecular replacement at 3.0 angstrom resolution using the annexin V core structure as the search model. The average backbone deviation between these two structures is 2.34 angstrom. The structure has been refined to an R-factor of 17.7% at 2.5 angstrom resolution. Six calcium sites have been identified in the annexin I structure. Each is located in the loop region of the helix-loop-helix motif. Two of the six calcium sites in annexin I are not occupied in the annexin V structure. The superpositions of the corresponding loop regions in the four domains show that the calcium binding loops in annexin I can be divided into two classes: type II and type III. Both classes are different from the well-known EF-hand motif (type I). C1 MAX PLANCK INST BIOCHEM,W-8033 MARTINSRIED,GERMANY. UNIV ULSAN,COLL MED,ASAN INST LIFE SCI,SEOUL 134600,SOUTH KOREA. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MOLEC CELL BIOL,BERKELEY,CA 94720. RI Luecke, Hartmut "Hudel"/F-4712-2012 OI Luecke, Hartmut "Hudel"/0000-0002-4938-0775 NR 29 TC 166 Z9 168 U1 1 U2 6 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0961-8368 J9 PROTEIN SCI JI Protein Sci. PD MAR PY 1993 VL 2 IS 3 BP 448 EP 458 PG 11 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KP464 UT WOS:A1993KP46400017 PM 8453382 ER PT J AU STILLMAN, R JONES, RT MOORE, D WALKER, J WELM, S AF STILLMAN, R JONES, RT MOORE, D WALKER, J WELM, S TI IMPROVED PERFORMANCE 4 HOURS AFTER COCAINE SO PSYCHOPHARMACOLOGY LA English DT Article DE COCAINE; ATTENTION; PERFORMANCE; REACTION TIME; SALIVA ID COVERT ORIENTATION; ATTENTION; INTRANASAL; HUMANS AB Cocaine (2 mg/kg) was given orally to 13 healthy volunteers and physiologic, subjective, attentional and performance effects were measured over a period of 4 h. Posner's reaction time paradigm measured the effects of cocaine on performance and on attention to visual cues. Cocaine increased heart rate, systolic blood pressure and pupil diameter and reduced skin temperature. Physiologic effects, subjective rating of intoxication, and cocaine levels in saliva peaked at approximately 75 min and returned to precocaine levels within 3 h. In contrast, a reaction time measure of performance speed on the visual attention task showed improvement for 4 h after cocaine. A measure of covert attention in the cocaine condition failed to show the improvement which occurred in the placebo condition. Less fatigue was reported 4 h after cocaine than after placebo. Cocaine users may experience the drug's stimulant effects considerably longer than the euphoriant effects. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF SAN FRANCISCO,MED CTR,DEPT PSYCHIAT,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,MED CTR,DEPT NEUROL,SAN FRANCISCO,CA 94143. RP STILLMAN, R (reprint author), LIVERMORE VA MED CTR,PSYCHIAT SERV,5150 ARROYO RD,LIVERMORE,CA 94550, USA. FU NIDA NIH HHS [DA01696, DA02829, DA00053] NR 20 TC 26 Z9 27 U1 2 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0033-3158 J9 PSYCHOPHARMACOLOGY JI Psychopharmacology PD MAR PY 1993 VL 110 IS 4 BP 415 EP 420 DI 10.1007/BF02244647 PG 6 WC Neurosciences; Pharmacology & Pharmacy; Psychiatry SC Neurosciences & Neurology; Pharmacology & Pharmacy; Psychiatry GA KQ409 UT WOS:A1993KQ40900006 PM 7870911 ER PT J AU JAHAN, MS ERMER, DR COOKE, DW AF JAHAN, MS ERMER, DR COOKE, DW TI EFFECT OF X-IRRADIATION ON OPTICAL-PROPERTIES OF TEFLON-AF SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article ID ELECTRON-SPIN-RESONANCE; OXIDATIVE-DEGRADATION; RADIATION; STABILIZATION; POLYPROPYLENE AB Radiation effects in optical-grade amorphous fluoropolymer, Teflon-AF, is investigated by UV-visible absorption and electron spin resonance (ESR) measurements. When irradiated with low-energy (40 kVp) X-rays at room temperature in air, Teflon-AF is found to develop a broad, structureless UV-absorption band in the wavelength interval 200-350 nm. While the UV absorption increases as a function of X-ray dose, with relative rates of approx 2 x 10(-5) Gy-1 (1 x 10(-5) Gy-1) in Teflon-AF 1600 (Teflon-AF 2400), its optical transparency for a given dose of 67.5 kGy, however, remains unaffected. Additional measurements conducted using electron spin resonance (ESR) technique reveal that the observed UV absorption is caused by the X-ray induced peroxy radical (POO.). The results also suggest that the inclusion of dioxole monomer in the PTFE chain not only improves the optical clarity of Teflon-AF, as reported, but also increases its radiation tolerance. During a post-irradiation storage in air at RT for about 30 days the peroxy radical is observed to decay, with a concomitant decrease in UV absorption. A tentative model is proposed to explain the radiation damage and recovery mechanisms. C1 LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP MEMPHIS STATE UNIV, DEPT PHYS, MEMPHIS, TN 38152 USA. NR 18 TC 4 Z9 4 U1 2 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0969-806X J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD MAR PY 1993 VL 41 IS 3 BP 481 EP 486 DI 10.1016/0969-806X(93)90008-I PG 6 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA KZ538 UT WOS:A1993KZ53800008 ER PT J AU CZAPSKI, G BIELSKI, BHJ AF CZAPSKI, G BIELSKI, BHJ TI ABSORPTION-SPECTRA OF THE .OH AND O-RADICAL-ANION RADICALS IN AQUEOUS-SOLUTIONS SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article AB The spectra of .OH and O-. radicals were determined in N2O saturated neutral and alkaline solutions. The .OH radical has an absorption maximum at 230 nm with epsilon = (665 +/- 25) dm3 mol-1 cm-1 while the spectrum of the O.- radical shows a continuous increase in absorbance with decreasing wave length between 350 and 220 nm; no maximum was observed in this range. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. NR 8 TC 20 Z9 20 U1 2 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-5724 J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD MAR PY 1993 VL 41 IS 3 BP 503 EP 505 DI 10.1016/0969-806X(93)90012-J PG 3 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA KZ538 UT WOS:A1993KZ53800012 ER PT J AU BIELSKI, BHJ AF BIELSKI, BHJ TI A PULSE-RADIOLYSIS STUDY OF THE REACTION OF OZONE WITH CL2-RADICAL-ANION IN AQUEOUS-SOLUTIONS SO RADIATION PHYSICS AND CHEMISTRY LA English DT Article ID DISSOCIATING ORGANIC-COMPOUNDS; RESONANCE RAMAN-SPECTRA; RATE CONSTANTS; INORGANIC-COMPOUNDS; RADICALS; WATER; PHOTOLYSIS; CHEMISTRY; ANIONS; DECAY AB Yields of .OH radicals were determined, with the use of the Cl2-. radical, in perchloric acid solutions (1.0 mM to 1.0 M) saturated with oxygen, nitrous oxide or nitrous oxide and ozone. The Cl2-. radical, produced by pulse radiolysis in aqueous solutions containing variable amounts of NaCl and HClO4/HCl, reacts with added ozone at k(O3 + Cl2-.) = (9.0 +/- 0.3) x 10(7) dm3 mol-1 s-1. Its molar absorbance at its 340 nm peak is epsilon = (9580 +/- 100) dm3 mol-1 cm-1. G(Cl2-.) = (6.4 +/- 0.1) in N2O saturated 0.1 mol dm-3 HClO4 containing 0.01 mol dm-3 NaCl and 0.4-6.3 mmol dm-3 ozone. The conversion of the primary reducing radicals (e(aq)-, H) to .OH radicals by ozone, will facilitate studies of hypervalent oxidation states of metal ions in acid solutions where G(H) > G(.OH). RP BIELSKI, BHJ (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 36 TC 20 Z9 20 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0146-5724 J9 RADIAT PHYS CHEM JI Radiat. Phys. Chem. PD MAR PY 1993 VL 41 IS 3 BP 527 EP 530 DI 10.1016/0969-806X(93)90015-M PG 4 WC Chemistry, Physical; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical SC Chemistry; Nuclear Science & Technology; Physics GA KZ538 UT WOS:A1993KZ53800015 ER PT J AU RAJU, MR EISEN, Y CARPENTER, S JARRETT, K HARVEY, WF AF RAJU, MR EISEN, Y CARPENTER, S JARRETT, K HARVEY, WF TI RADIOBIOLOGY OF ALPHA-PARTICLES .4. CELL INACTIVATION BY ALPHA-PARTICLES OF ENERGIES 0.4-3.5 MEV SO RADIATION RESEARCH LA English DT Article ID ULTRASOFT X-RAYS; DOSIMETRY RP RAJU, MR (reprint author), LOS ALAMOS NATL LAB,DIV LIFE SCI,POB 1663,LOS ALAMOS,NM 87545, USA. NR 15 TC 31 Z9 31 U1 0 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD MAR PY 1993 VL 133 IS 3 BP 289 EP 296 DI 10.2307/3578212 PG 8 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA KT921 UT WOS:A1993KT92100003 PM 8451379 ER PT J AU SACHS, RK AWA, A KODAMA, Y NAKANO, M OHTAKI, K LUCAS, JN AF SACHS, RK AWA, A KODAMA, Y NAKANO, M OHTAKI, K LUCAS, JN TI RATIOS OF RADIATION-PRODUCED CHROMOSOME-ABERRATIONS AS INDICATORS OF LARGE-SCALE DNA GEOMETRY DURING INTERPHASE SO RADIATION RESEARCH LA English DT Article ID INSITU HYBRIDIZATION; HUMAN-LYMPHOCYTES; FREQUENCY C1 UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. RADIAT EFFECTS RES FDN,DEPT GENET,HIROSHIMA 730,JAPAN. LAWRENCE LIVERMORE NATL LAB,DIV BIOMED & ENVIRONM SCI,LIVERMORE,CA 94550. RP SACHS, RK (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 33 TC 37 Z9 37 U1 0 U2 0 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD MAR PY 1993 VL 133 IS 3 BP 345 EP 350 DI 10.2307/3578220 PG 6 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA KT921 UT WOS:A1993KT92100011 PM 8451385 ER PT J AU VRAKKING, MJJ BRACKER, AS SUZUKI, T LEE, YT AF VRAKKING, MJJ BRACKER, AS SUZUKI, T LEE, YT TI ULTRASENSITIVE DETECTION OF HYDROGEN MOLECULES BY (2+1) RESONANCE-ENHANCED MULTIPHOTON IONIZATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID INTERNAL-STATE DISTRIBUTIONS; NP RYDBERG STATES; 2-PHOTON SPECTROSCOPY; QUANTITATIVE-DETERMINATION; ELECTRIC-FIELD; H-2; H2; EXCITATION; HD; DISSOCIATION AB Ultrasensitive detection of molecular hydrogen is reported by using Doppler-free (2 + 1) resonance-enhanced multiphoton ionization through the EF 1SIGMA(g)+ state. By using an arrangement with two near-transform-limited counterpropagating laser beams, a single-shot detection efficiency of 6.8 X 10(3) Molecules/cm3 has been demonstrated. Frequency scans of the two-photon transitions show that the detection efficiency is limited by ac Stark effects. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP VRAKKING, MJJ (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012 NR 39 TC 16 Z9 16 U1 0 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1993 VL 64 IS 3 BP 645 EP 652 DI 10.1063/1.1144191 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA KT534 UT WOS:A1993KT53400008 ER PT J AU MCINTYRE, BJ SALMERON, M SOMORJAI, GA AF MCINTYRE, BJ SALMERON, M SOMORJAI, GA TI A VARIABLE PRESSURE TEMPERATURE SCANNING TUNNELING MICROSCOPE FOR SURFACE SCIENCE AND CATALYSIS STUDIES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB We describe the design and construction of a scanning tunneling microscope (STM), which is contained in a reactor cell and allows in situ operation throughout a wide range of pressures and temperatures. This STM is capable of imaging in pressures ranging from ultrahigh vacuum up to several atmospheres. Samples can also be easily moved in and out of the STM cell in a small separate vacuum transfer chamber for external characterization and treatment. The equilibration time and stability of the microscope after temperature changes was determined at atmospheric pressures, by monitoring the evolution of atomically resolved images of highly oriented pyrolytic graphite at temperatures ranging from 300 to 425 K. We have also examined the stability when flowing gases are used instead of stationary pressures. In preliminary experiments using Pt (111) and (110) crystals, we have observed the effect of atmospheres of H-2 and O2 on the structure of these surfaces. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP MCINTYRE, BJ (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 7 TC 68 Z9 68 U1 1 U2 17 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1993 VL 64 IS 3 BP 687 EP 691 DI 10.1063/1.1144198 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA KT534 UT WOS:A1993KT53400015 ER PT J AU FINCKE, JR SNYDER, SC SWANK, WD AF FINCKE, JR SNYDER, SC SWANK, WD TI COMPARISON OF ENTHALPY PROBE AND LASER-LIGHT SCATTERING MEASUREMENT OF THERMAL PLASMA TEMPERATURES AND VELOCITIES SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ARGON; ARCS; JETS AB Gas temperature and velocity profiles in argon thermal plasmas, measured by an enthalpy probe and high spectral resolution laser light scattering, are compared. In the laser scattering measurement the plasma temperature and velocity are determined directly from high-resolution Doppler-shifted line-shape analysis of light scattered by the plasma. The technique yields an unambiguous determination of gas or kinetic temperature without the assumption of local thermodynamic equilibrium. Velocity is determined directly from the measured Doppler shift. The enthalpy probe is a combination Pitot tube and flowing calorimeter. The assumption of thermodynamic equilibrium is required to obtain velocity and temperature from measured enthalpy and stagnation pressure. Peak temperature and velocity values observed were approximately 13 000 K and 1300 m s-1. The results from both the intrusive enthalpy probe and nonintrusive laser light scattering technique compare favorably. The limitations of both techniques are discussed. RP FINCKE, JR (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,POB 1625,IDAHO FALLS,ID 83415, USA. NR 26 TC 28 Z9 30 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1993 VL 64 IS 3 BP 711 EP 718 DI 10.1063/1.1144203 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA KT534 UT WOS:A1993KT53400020 ER PT J AU CAMPBELL, AA FRYXELL, GE GRAFF, GL RIEKE, PC TARASEVICH, BJ AF CAMPBELL, AA FRYXELL, GE GRAFF, GL RIEKE, PC TARASEVICH, BJ TI THE NUCLEATION AND GROWTH OF CALCIUM-OXALATE MONOHYDRATE ON SELF-ASSEMBLED MONOLAYERS (SAMS) SO SCANNING MICROSCOPY LA English DT Article DE CALCIUM OXALATE; SELF-ASSEMBLING MONOLAYERS; NUCLEATION; UROLITHIASIS ID ORGANIC MATRIX; RENAL CALCULI; STONE MATRIX; DENTIN AB A physical chemical approach was used to study calcium oxalate monohydrate (COM) nucleation and growth on various organic interfaces. Self-assembling monolayers (SAMs), containing derivatized organic functional groups, were designed to mimic various amino acid residues present in both urine and stone matrix macromolecules. Derivatized surfaces include SAMs with terminal methyl, bromo, imidazole, and thiazolidine-carboxylic acid functional groups. Pronounced differences in COM deposition were observed for the various interfaces with the imidazole and thiazolidine surfaces having the greatest effect and the methyl and bromo groups having little or no nucleating potential. RP CAMPBELL, AA (reprint author), PACIFIC NW LAB,DEPT MAT SCI,POB 999,MSIN K2-44, BATTELLE BLVD, RICHLAND, WA 99352 USA. NR 21 TC 39 Z9 40 U1 0 U2 1 PU SCANNING MICROSCOPY INT PI CHICAGO PA PO BOX 66507, AMF O'HARE, CHICAGO, IL 60666 SN 0891-7035 J9 SCANNING MICROSCOPY JI Scanning Microsc. PD MAR PY 1993 VL 7 IS 1 BP 423 EP 429 PG 7 WC Microscopy SC Microscopy GA LA654 UT WOS:A1993LA65400046 PM 8316812 ER PT J AU STRONGGUNDERSON, JM AF STRONGGUNDERSON, JM TI FLIGHT-TESTING FRUIT-FLIES SO SCIENTIFIC AMERICAN LA English DT Article RP STRONGGUNDERSON, JM (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 SN 0036-8733 J9 SCI AM JI Sci.Am. PD MAR PY 1993 VL 268 IS 3 BP 144 EP 145 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KM972 UT WOS:A1993KM97200017 ER PT J AU BUTLER, MA BUSS, RJ AF BUTLER, MA BUSS, RJ TI KINETICS OF THE MICROMIRROR CHEMICAL SENSOR SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON OPTICAL CHEMICAL SENSORS AND BIOSENSORS ( EUROPT(R)ODE 1 ) CY APR 12-15, 1992 CL GRAZ, AUSTRIA ID PALLADIUM; FILMS AB Most chemical sensors involve a sensitizing coating that interacts with the chemical species to be detected to produce a change in some physical parameter which can then be measured. The speed of response of the sensor depends to a large extent on the nature of this chemical interaction. Here we explore the kinetics of the micromirror chemical sensor, a reflective-type optical-fiber sensor, for two different interactions: (1) the detection of hydrogen at high concentrations using palladium films; (2) organic vapor detection using a plasma-polymerized fluorocarbon film. For hydrogen detection, where the palladium films are very thin (approximately 10 nm), the kinetics are determined by the complex nature of the surface chemistry; the presence of oxygen changes the speed of the sensor response. For organic vapor detection, the fluorocarbon film is much thicker (approximately 1 mum) and the speed of response is determined by diffusion of the organic molecules through the fluorocarbon film. RP BUTLER, MA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 15 TC 10 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD MAR 1 PY 1993 VL 11 IS 1-3 BP 161 EP 166 DI 10.1016/0925-4005(93)85250-E PG 6 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA KX147 UT WOS:A1993KX14700020 ER PT J AU ANHEIER, NC OLSEN, KB GRIFFIN, JW AF ANHEIER, NC OLSEN, KB GRIFFIN, JW TI FIBEROPTIC SPECTROCHEMICAL EMISSIONS SENSOR - A DETECTOR FOR VOLATILE CHLORINATED COMPOUNDS SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON OPTICAL CHEMICAL SENSORS AND BIOSENSORS ( EUROPT(R)ODE 1 ) CY APR 12-15, 1992 CL GRAZ, AUSTRIA AB We present a fiber-optic sensor developed to measure volatile chlorine-containing compounds in the gas phase. This unique sensor, called the HaloSnif(TM), is based on the atomic emission of chlorine. The HaloSnif sensor uses a critical orifice air inlet (a 50 mum capillary tube) and a radio frequency (r.f.) excited helium plasma to excite the ambient air sample. A fiber-optic cable transmits the chlorine emission intensity to a signal-processing module, where it is optically filtered and amplified. The HaloSnif system consists of a miniaturized probe (approximately 10 cm x 4 cm), fiber-optic cable, r.f. power supply, and a flow-control and signal-processing module. The compact robust system has been successfully field-tested at several waste-remediation sites. The detection limit for trichloroethylene in air is 1 ppm, with over four orders of linear response. Furthermore, HaloSnif is capable of measuring concentrations of any gas-phase chlorine-containing compound. RP ANHEIER, NC (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 2 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 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD MAR 1 PY 1993 VL 11 IS 1-3 BP 447 EP 453 DI 10.1016/0925-4005(93)85286-J PG 7 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA KX147 UT WOS:A1993KX14700056 ER PT J AU SMITH, BF AF SMITH, BF TI A PARALLEL IMPLEMENTATION OF AN ITERATIVE SUBSTRUCTURING ALGORITHM FOR PROBLEMS IN 3 DIMENSIONS SO SIAM JOURNAL ON SCIENTIFIC COMPUTING LA English DT Article DE DOMAIN DECOMPOSITION; FINITE ELEMENTS; ITERATIVE SUBSTRUCTURING; PARALLEL COMPUTING ID DOMAIN DECOMPOSITION ALGORITHM; ELLIPTIC PROBLEMS AB Numerical results from a parallel implementation of a class of iterative substructuring algorithms are reported. The algorithms are for solving self-adjoint elliptic partial differential equations in three dimensions. Results are given for several variants of the algorithm. In the first variant, exact interior solvers are used; in the second, one multigrid V-cycle is used to solve the interior problems approximately. The results are compared with theoretical behavior of the algorithm reported in previous work. A numerical experiment involving the equations of linear elasticity is also included. RP SMITH, BF (reprint author), ARGONNE NATL LAB,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 25 TC 24 Z9 24 U1 0 U2 2 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 1064-8275 J9 SIAM J SCI COMPUT JI SIAM J. Sci. Comput. PD MAR PY 1993 VL 14 IS 2 BP 406 EP 423 DI 10.1137/0914025 PG 18 WC Mathematics, Applied SC Mathematics GA KP467 UT WOS:A1993KP46700009 ER PT J AU HIRST, E YOURSTONE, E GETTINGS, M AF HIRST, E YOURSTONE, E GETTINGS, M TI A NEW MODEL OF INCREMENTAL DECISION-MAKING FOR RESOURCE ACQUISITION BY ELECTRIC UTILITIES SO SIMULATION LA English DT Article AB Electric utilities have developed and applied several new ways to address the uncertainties they face in resource planning. In these methods, however, all the resource-acquisition decisions (e.g., construction of power plants and operation of energy-efficient programs) are made at the beginning of the simulation. This paper describes a new model that explicitly deals with the frequent, incremental nature of utility decision making. This model requires users to interact with model results and forecasts after every year or two of simulation. At that time, the user can initiate new resource acquisitions or modify past decisions (e.g., slow down construction of a power plant or change the marketing budget for an energy-efficiency program). RP HIRST, E (reprint author), OAK RIDGE NATL LAB,DIV ENERGY,OAK RIDGE,TN 37831, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU SIMULATION COUNCILS INC PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92117 SN 0037-5497 J9 SIMULATION JI Simulation PD MAR PY 1993 VL 60 IS 3 BP 196 EP 207 DI 10.1177/003754979306000308 PG 12 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering SC Computer Science GA LA929 UT WOS:A1993LA92900006 ER PT J AU ALONSO, RG MASCARENHAS, A FROYEN, S HORNER, GS BERTNESS, K OLSON, JM AF ALONSO, RG MASCARENHAS, A FROYEN, S HORNER, GS BERTNESS, K OLSON, JM TI POLARIZED PIEZOMODULATED REFLECTANCE STUDY OF SPONTANEOUS ORDERING IN GAINP2 SO SOLID STATE COMMUNICATIONS LA English DT Article ID PHOTOLUMINESCENCE AB Piezomodulated reflectivity is used to probe the electronic structure of GaInP2 epilayers grown by organometallic vapor phase epitaxy, which exhibit various degrees of ordering. Our study provides information on the fundamental gap, crystal field splitting, and spin-orbit splitting at 15 K. Our results provide evidence for domains with a distribution of order parameters eta in epitaxial films of GaInP2 that exhibit spontaneous ordering. Aspnes' first derivative functional form for the piezomodulated reflectivity line shape is used to fit the spectra. RP ALONSO, RG (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 10 TC 20 Z9 20 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD MAR PY 1993 VL 85 IS 12 BP 1021 EP 1024 DI 10.1016/0038-1098(93)90158-J PG 4 WC Physics, Condensed Matter SC Physics GA KU291 UT WOS:A1993KU29100007 ER PT J AU VISCO, SJ LIU, ML DOEFF, MM MA, YP LAMPERT, C DEJONGHE, LC AF VISCO, SJ LIU, ML DOEFF, MM MA, YP LAMPERT, C DEJONGHE, LC TI POLYORGANODISULFIDE ELECTRODES FOR SOLID-STATE BATTERIES AND ELECTROCHROMIC DEVICES SO SOLID STATE IONICS LA English DT Article; Proceedings Paper CT SATELLITE MEETING ON POLYMER IONICS, AT THE INTERNATIONAL CONF ON THE SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS CY AUG 19-21, 1992 CL CHALMERS UNIV, GOTHENBURG, SWEDEN SP NFR, NUTEK, NORDISKA MINISTERRADET HO CHALMERS UNIV ID REDOX POLYMERIZATION ELECTRODES; ELECTROCHEMICAL PROPERTIES; CATHODES; CELLS AB The use of polyorganodisulfides in a variety of solid-state batteries and electrochromic devices is discussed. Cycling data is presented for solid-state batteries using sodium and sodium-lead alloy negative electrodes with polyethylene oxide electrolyte and polydimercaptothiadiazole positive electrodes. Rate capabilities are comparable to that for analogous lithium batteries, but cells show continual deterioration with extended cycling. The use of polyorganodisulfide electrodes as optically passive counter electrodes for electrochromic devices is also described. Solid-state devices consisting of molybdenum doped WO3, amorphous polyethylene oxide electrolyte (aPEO), and a polyorganodisulfide counter electrode colored rapidly from a pale yellow to a deep blue-green, upon application of 1.2 V dc. The photopic transmittance changed from 61 to 9%, and the solar transmittance from 45 to 5% during the coloration process. RP VISCO, SJ (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. RI Liu, Meilin/E-5782-2010; Doeff, Marca/G-6722-2013 OI Liu, Meilin/0000-0002-6188-2372; Doeff, Marca/0000-0002-2148-8047 NR 15 TC 25 Z9 27 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD MAR PY 1993 VL 60 IS 1-3 BP 175 EP 187 DI 10.1016/0167-2738(93)90293-C PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LC309 UT WOS:A1993LC30900028 ER PT J AU BOGUSLAVSKY, L HALE, PD GENG, L SKOTHEIM, TA LEE, HS AF BOGUSLAVSKY, L HALE, PD GENG, L SKOTHEIM, TA LEE, HS TI APPLICATIONS OF REDOX POLYMERS IN BIOSENSORS SO SOLID STATE IONICS LA English DT Article; Proceedings Paper CT SATELLITE MEETING ON POLYMER IONICS, AT THE INTERNATIONAL CONF ON THE SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS CY AUG 19-21, 1992 CL CHALMERS UNIV, GOTHENBURG, SWEDEN SP NFR, NUTEK, NORDISKA MINISTERRADET HO CHALMERS UNIV ID DIRECT ELECTRICAL COMMUNICATION; CHEMICALLY MODIFIED ENZYMES; CARBON PASTE ELECTRODE; GLUCOSE-OXIDASE; AMPEROMETRIC DETERMINATION; MODIFIED GRAPHITE; METAL-ELECTRODES; OXIDATION; FILMS; IMMOBILIZATION AB Polymers containing covalently attached redox molecules can be highly effective electron transfer mediators for flavin adenine dinucleotide redox centers of many oxidases. Highly flexible siloxane and ethylene oxide polymers containing covalently attached ferrocene molecules are shown to be capable of mediating electron transfer between enzymes and an electrode. The construction and response of bienzyme cholesterol biosensor, acetylcholine and glucose biosensor are described and discussed. Our data showed that the flexibility, hydrophilicity of the polymer, the density of redox centers in the polymer matrices and the self-exchange reaction rate of the redox molecules control the efficiency of the electron transfer mediation. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP BOGUSLAVSKY, L (reprint author), MOLTECH CORP,25 E LOOP RD,STONY BROOK,NY 11790, USA. NR 28 TC 11 Z9 11 U1 3 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD MAR PY 1993 VL 60 IS 1-3 BP 189 EP 197 DI 10.1016/0167-2738(93)90294-D PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LC309 UT WOS:A1993LC30900029 ER PT J AU ZAWODZINSKI, TA SPRINGER, TE URIBE, F GOTTESFELD, S AF ZAWODZINSKI, TA SPRINGER, TE URIBE, F GOTTESFELD, S TI CHARACTERIZATION OF POLYMER ELECTROLYTES FOR FUEL-CELL APPLICATIONS SO SOLID STATE IONICS LA English DT Article; Proceedings Paper CT SATELLITE MEETING ON POLYMER IONICS, AT THE INTERNATIONAL CONF ON THE SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS CY AUG 19-21, 1992 CL CHALMERS UNIV, GOTHENBURG, SWEDEN SP NFR, NUTEK, NORDISKA MINISTERRADET HO CHALMERS UNIV ID ION-EXCHANGE MEMBRANES; NAFION MEMBRANES; WATER DIFFUSION; ACID MEMBRANES; SELF-DIFFUSION AB We review here our recent work on polymer electrolyte fuel cells emphasizing membrane transport issues. Transport parameters measured at 30-degrees-C for several available perfluorosulfonic acid membranes are compared. The diffusion coefficient and conductivity of each of these membranes were determined as functions of membrane water content. Data on water sorption and conductivity are reported for an experimental membrane which is a modified form of NAFION(R). Contact angle measurements indicate that the surface of a perfluorosulfonic acid membrane exposed to water vapor is quite hydrophobic, even in the presence of saturated water vapor. Modeling of water distribution in PEFCs based on the uptake and transport data shows that membrane thickness contributes in a nonlinear fashion to performance in PEM fuel cells. RP ZAWODZINSKI, TA (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 33 TC 274 Z9 280 U1 6 U2 50 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD MAR PY 1993 VL 60 IS 1-3 BP 199 EP 211 DI 10.1016/0167-2738(93)90295-E PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA LC309 UT WOS:A1993LC30900030 ER PT J AU MANSURE, AJ MELDAU, RF WEYLAND, HV AF MANSURE, AJ MELDAU, RF WEYLAND, HV TI FIELD EXAMPLES OF ELECTRICAL-RESISTIVITY CHANGES DURING STEAMFLOODING SO SPE FORMATION EVALUATION LA English DT Article AB An essential part of using electrical geodiagnostic techniques to map thermal recovery processes is understanding the relationship between the process and the formation resistivity. This paper shows how the relationships used to interpret electrical well logs can be used to understand steamflood resistivity changes. Examples are presented of data from steamfloods in fields with different reservoir characteristics. Included is a typical heavy-oil steamflood (Kern River field) and a steamflood where fresh water is used for the steam generator feedwater (Elk Hills field). Because of differences in reservoir characteristics, changes in resistivity vary from reservoir to reservoir. The information presented include well logs taken before and after steamflooding and petrophysical measurements sufficient to determine the factors that controlled the resistivity changes in each field. RP MANSURE, AJ (reprint author), SANDIA NATL LABS,TECH STAFF,ALBUQUERQUE,NM 87185, USA. NR 0 TC 3 Z9 6 U1 0 U2 1 PU SOC PETROLEUM ENG PI RICHARDSON PA 222 PALISADES CREEK DR, RICHARDSON, TX 75080 SN 0885-923X J9 SPE FORMATION EVAL JI SPE Form. Eval. PD MAR PY 1993 VL 8 IS 1 BP 57 EP 64 PG 8 WC Energy & Fuels; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA KV437 UT WOS:A1993KV43700008 ER PT J AU ABERNATHY, DL GIBBS, D GRUBEL, G HUANG, KG MOCHRIE, SGJ SANDY, AR ZEHNER, DM AF ABERNATHY, DL GIBBS, D GRUBEL, G HUANG, KG MOCHRIE, SGJ SANDY, AR ZEHNER, DM TI RECONSTRUCTION OF THE (111) AND (001) SURFACES OF AU AND PT - THERMAL-BEHAVIOR SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 3RD ISSP INTERNATIONAL SYMP ON DYNAMICAL PROCESSES AT SOLID SURFACES ( ISSP-3 ) CY APR 20-23, 1992 CL TOKYO, JAPAN SP MINIST EDUC SCI & CULTURE JAPAN, INOUE FDN SCI, NISHINA MEM FDN, INT SUPERCONDUCT TECHNOL CTR, FUJITSU, HITACHI, HOYA, IBM JAPAN, KAO, KAWASKI STEEL ID REGISTERED PHASE-TRANSITION; RAY-SCATTERING MEASUREMENTS; X-RAY; AU(001) SURFACE; ORIENTATIONAL EPITAXY; AU(111) SURFACE; STRESS TENSOR; MONOLAYERS; GRAPHITE; DISLOCATIONS AB The results of X-ray scattering studies of the (111) and (001) surfaces of Au and Pt are summarized. Each of these surfaces exhibits, in some temperature range, a reconstruction which approximates a close packed hexagonal layer, denser than the (111) planes of bulk Au or Pt. The results are discussed in the context of recent theories of surface reconstruction and of two-dimensional phase transformations. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. OAK RIDGE NATL LAB,DIV SOLID STATE PHYS,OAK RIDGE,TN 37831. RP ABERNATHY, DL (reprint author), MIT,DEPT PHYS,CAMBRIDGE,MA 02139, USA. RI Abernathy, Douglas/A-3038-2012 OI Abernathy, Douglas/0000-0002-3533-003X NR 39 TC 36 Z9 36 U1 2 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAR 1 PY 1993 VL 283 IS 1-3 BP 260 EP 276 DI 10.1016/0039-6028(93)90991-R PG 17 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA KM975 UT WOS:A1993KM97500042 ER PT J AU SOOS, ZG RAMASESHA, S GALVAO, DS KEPLER, RG ETEMAD, S AF SOOS, ZG RAMASESHA, S GALVAO, DS KEPLER, RG ETEMAD, S TI ELECTRONIC EXCITATIONS AND ALTERNATION OF CONJUGATED POLYMERS SO SYNTHETIC METALS LA English DT Article ID SEMIEMPIRICAL METHODS; CONDUCTING POLYMERS; MAGNETIC-RESONANCE; OPTIMIZATION; PARAMETERS; SYSTEMS; MODELS; FILMS AB The electronic excitations and fluorescence of conjugated polymers are related to large or small alternation delta of the transfer integrals t(1 +/- delta) along the backbone. The fluorescence of polysilanes (PSs) and poly(para-phenylenevinylene (PPV) is linked to large delta, which places the one-photon gap E(g) below the lowest two-photon gap E(a) and reduces distortions due to electron-phonon (e-p) coupling. In contrast to small delta approximately 0.1 in pi-conjugated polymers, such as polyacetylene (PA), para-conjugated phenyls lead to an extended pi-system with increased alternation, to states localized on each ring and to charge-transfer excitations between them. Surprisingly good agreement is found between semiempirical parametric method 3 (PM3) bond lengths and exact Pariser Parr-Pople (PPP) pi-bond orders for trans-stilbene, where the PPV bipolarons are confined to two phenyls. Stilbene spectra are consistent with increased alternation and small e-p distortions. C1 INDIAN INST SCI, SOLID STATE & STRUCT CHEM UNIT, BANGALORE 560012, KARNATAKA, INDIA. BELL COMMUN RES INC, RED BANK, NJ 07701 USA. UNIV ESTADUAL CAMPINAS, DEPT FIS APLICADA, BR-13081 CAMPINAS, SP, BRAZIL. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP SOOS, ZG (reprint author), PRINCETON UNIV, DEPT CHEM, PRINCETON, NJ 08544 USA. RI Inst. of Physics, Gleb Wataghin/A-9780-2017; Galvao, Douglas/J-6017-2013 OI Galvao, Douglas/0000-0003-0145-8358 NR 42 TC 22 Z9 22 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 1 PY 1993 VL 54 IS 1-3 BP 35 EP 47 DI 10.1016/0379-6779(93)91043-2 PG 13 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA KT786 UT WOS:A1993KT78600005 ER PT J AU GAMMEL, JT SAXENA, A BISHOP, AR BATISTIC, I AF GAMMEL, JT SAXENA, A BISHOP, AR BATISTIC, I TI FEMTOSECOND DYNAMICS, PHOTOEXCITATION AND ESR-SPECTRA OF MX CHAIN SOLIDS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT SYMP ON SYNTHETIC ELECTROACTIVE MATERIALS FOR NONLINEAR OPTICS AND ELECTRONICS, AT THE 1992 SPRING CONF OF THE EUROPEAN MATERIAL RESEARCH SOC CY JUN 02-05, 1992 CL STRASBOURG, FRANCE SP COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, ELSEVIER SCI PUBL, OFF TOURISME VILLE STRASBOURG, EUROPEAN PARLIAMENT, VILLE STRASBOURG, XEROX AB Non-linear adiabatic dynamics and ESR spectra associated with non-linear excitations in MX chain (M = Pt; X = Cl, Br, I) materials are numerically studied within a discrete, 3/4-filled, two-band, tight-binding extended Peierls-Hubbard model. Both Hartree-Fock (HF) adiabatic molecular relaxation and molecular dynamics techniques are employed to investigate the time evolution of solitons, polarons, bipolarons in charge-density-wave (CDW) ground state materials. The time evolution of excitons, defect pairs and/or breathers is studied subsequent to photoexcitation. The ESR spectra associated with the resulting spin carrying non-linear excitations such as neutral solitons, triplet excitons as well as electron and hole polarons are then calculated within the above model. The superhyperfine structure in the ESR spectra is attributed to a small spin density present on the halogen sublattice. C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV ZAGREB,INST PHYS,ZAGREB 410011,CROATIA. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP GAMMEL, JT (reprint author), USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,MAT RES BRANCH,DIV RDT & E,SAN DIEGO,CA 92152, USA. NR 6 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 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 1 PY 1993 VL 54 IS 1-3 BP 237 EP 241 DI 10.1016/0379-6779(93)91066-B PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA KT786 UT WOS:A1993KT78600028 ER PT J AU SAXENA, A HUANG, XZ BISHOP, AR WORL, LA LOVE, SP SWANSON, BI GAMMEL, JT AF SAXENA, A HUANG, XZ BISHOP, AR WORL, LA LOVE, SP SWANSON, BI GAMMEL, JT TI PHOTOINDUCED ELECTRON-HOLE CHARGE SEPARATION, INTRINSIC SELF-DOPING AND NOVEL DEVICE APPLICATIONS OF Q1D HETEROJUNCTION MATERIALS - MIXED-HALIDE MX SOLIDS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT SYMP ON SYNTHETIC ELECTROACTIVE MATERIALS FOR NONLINEAR OPTICS AND ELECTRONICS, AT THE 1992 SPRING CONF OF THE EUROPEAN MATERIAL RESEARCH SOC CY JUN 02-05, 1992 CL STRASBOURG, FRANCE SP COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, ELSEVIER SCI PUBL, OFF TOURISME VILLE STRASBOURG, EUROPEAN PARLIAMENT, VILLE STRASBOURG, XEROX AB We have extensively studied, both experimentally and theoretically, the following three mixed-halide systems: (i) PtClxBr1-x, (ii) PtClxI1-x and (iii) PtBrxI1-x for a variety of concentrations x. We have obtained direct spectroscopic evidence (vibrational modes) for charge separation from resonance Raman (RR) experiments on doped and photoexcited single crystals of PtClxBr1-x. In particular, electron polarons preferentially locate on the PtBr segment while hole polarons are trapped within PtCl segments. This polaron charge selectivity, which is potentially very useful for photovoltaic device applications, is demonstrated within theoretical calculations based on a discrete, 3/4-filled, two-band, tight-binding, extended Peierls-Hubbard model, showing strong hybridization of PtCl and PtBr electronic bands as the driving force for separation. In contrast to PtClxBr1-x, we find that both the PtClxI1-x and the PtBrxI1-x systems exhibit qualitatively different behavior, such as intrinsic 'self-doping'. In other words, our simulations predict that electronic charge is spontaneously removed from the PtI segment and injected into the PtCl (or PtBR) segment, thus creating hole defects in PtI and electron defects (polarons/bipolarons) in PtCl (or PtBr). C1 LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,ISOTOPE & STRUCT CHEM GRP,LOS ALAMOS,NM 87545. USN,CTR OCEAN SYST,MAT RES BRANCH,SAN DIEGO,CA 92152. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. RP SAXENA, A (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 9 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 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 1 PY 1993 VL 54 IS 1-3 BP 385 EP 390 DI 10.1016/0379-6779(93)91084-F PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA KT786 UT WOS:A1993KT78600046 ER PT J AU KEPLER, RG SOOS, ZG THORNE, JRG AF KEPLER, RG SOOS, ZG THORNE, JRG TI EXCITON KINETICS IN POLY(DI-N-HEXYLSILANE) SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT SYMP ON SYNTHETIC ELECTROACTIVE MATERIALS FOR NONLINEAR OPTICS AND ELECTRONICS, AT THE 1992 SPRING CONF OF THE EUROPEAN MATERIAL RESEARCH SOC CY JUN 02-05, 1992 CL STRASBOURG, FRANCE SP COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, ELSEVIER SCI PUBL, OFF TOURISME VILLE STRASBOURG, EUROPEAN PARLIAMENT, VILLE STRASBOURG, XEROX ID SIGMA-CONJUGATED POLYSILANES; OPTICAL-PROPERTIES; FILMS; POLY(DI-NORMAL-HEXYLSILANE); POLYMERS AB We have previously shown that charge carriers are generated by exciton-exciton annihilation in solid films of poly(di-n-hexylsilane). Using this phenomenon we show that the exciton exciton annihilation rate constant gamma at ambient temperature is not a function of the photon energy used to create the excitons even at energies well out into the long wavelength tail of the exciton absorption band. We also show that the excitons remain, highly mobile throughout their 600 ps lifetime and that they diffuse distances comparable to the crystallite size in the film. The value of gamma obtained in these studies is in excellent agreement with that obtained previously in fluorescence intensity studies. C1 PRINCETON UNIV,PRINCETON,NJ 08544. UNIV PENN,PHILADELPHIA,PA 19104. RP KEPLER, RG (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAR 1 PY 1993 VL 54 IS 1-3 BP 391 EP 397 DI 10.1016/0379-6779(93)91085-G PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA KT786 UT WOS:A1993KT78600047 ER PT J AU GRIFFITH, WL AF GRIFFITH, WL TI TAPPI API CONFERENCE ADDRESSES PAPER-INDUSTRY RESEARCH CHALLENGES SO TAPPI JOURNAL LA English DT Editorial Material RP GRIFFITH, WL (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU TECH ASSN PULP PAPER IND INC PI NORCROSS PA 15 TECHNOLOGY PARK SOUTH, NORCROSS, GA 30092 SN 0734-1415 J9 TAPPI J JI TAPPI J. PD MAR PY 1993 VL 76 IS 3 BP 209 EP 210 PG 2 WC Materials Science, Paper & Wood SC Materials Science GA KQ959 UT WOS:A1993KQ95900024 ER PT J AU SOKALSKI, WA SHIBATA, M ORNSTEIN, RL REIN, R AF SOKALSKI, WA SHIBATA, M ORNSTEIN, RL REIN, R TI POINT-CHARGE REPRESENTATION OF MULTICENTER MULTIPOLE MOMENTS IN CALCULATION OF ELECTROSTATIC PROPERTIES SO THEORETICA CHIMICA ACTA LA English DT Article DE POINT CHARGE MODEL; MULTICENTER MULTIPOLE EXPANSION ID ATOMIC CHARGES; ECEPP POTENTIALS; HYDROGEN-BOND; MOLECULES; MODEL; DEPENDENCE; FORMAMIDE; EXPANSION; PEPTIDES; SYSTEMS AB Distributed Point Charge Models (PCM) for CO, (H2O)2, and HS-SH molecules have been computed from analytical expressions using multicenter multipole moments. The point charges (set of charges including both atomic and non-atomic positions) exactly reproduce both molecular and segmental multipole moments, thus constituting an accurate representation of the local anisotropy of electrostatic properties. In contrast to other known point charge models, PCM can be used to calculate not only intermolecular, but also intramolecular interactions. Comparison of these results with more accurate calculations demonstrated that PCM can correctly represent both weak and strong (intramolecular) interactions, thus indicating the merit of extending PCM to obtain improved potentials for molecular mechanics and molecular dynamics computational methods. C1 ROSWELL PK CANC INST, DEPT BIOPHYS, 666 ELM ST, BUFFALO, NY 14263 USA. PACIFIC NW LAB, MOLEC SCI RES CTR, RICHLAND, WA 99352 USA. INST ORGAN & PHYS CHEM, PL-50370 WROCLAW, POLAND. RI Sokalski, Waclaw/I-6151-2012 FU NIDCR NIH HHS [DE-AMPb-76-RLO-2225] NR 33 TC 11 Z9 12 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0040-5744 J9 THEOR CHIM ACTA JI Theor. Chim. Acta PD MAR PY 1993 VL 85 IS 1-3 BP 209 EP 216 DI 10.1007/BF01374589 PG 8 WC Chemistry, Physical SC Chemistry GA KT516 UT WOS:A1993KT51600019 PM 11539836 ER PT J AU GRIFFEY, SM MADEWELL, BR DAIRKEE, SH HUNT, JE NAYDAN, DK HIGGINS, RJ AF GRIFFEY, SM MADEWELL, BR DAIRKEE, SH HUNT, JE NAYDAN, DK HIGGINS, RJ TI IMMUNOHISTOCHEMICAL REACTIVITY OF BASAL AND LUMINAL EPITHELIUM-SPECIFIC CYTOKERATIN ANTIBODIES WITHIN NORMAL AND NEOPLASTIC CANINE MAMMARY-GLANDS SO VETERINARY PATHOLOGY LA English DT Article DE CYTOKERATINS; DOGS; IMMUNOHISTOCHEMISTRY; MAMMARY GLAND; NEOPLASIA ID 2 MONOCLONAL-ANTIBODIES; INTERMEDIATE FILAMENTS; BREAST-CANCER; EXPRESSION; TUMORS; CARCINOMAS; CELLS; VIMENTIN; KERATIN AB Human basal epithelium(myoepithelium)-specific(312C8-1)and luminal epithelium-specific(13H5) cytokeratin antibodies were applied to frozen sections of normal canine mammary tissues (seven), benign adenomas and hyperplasias (five), mixed tumors (12), and adenocarcinomas (18) to determine if epithelial subsets could be discriminated by the use of an avidin biotin peroxidase complex immunohistochemical procedure. The 312C8-1 and 13H5 antibodies were consistently reactive with basal and luminal epithelium, respectively, in the normal mammary gland (7/7) and in benign adenomas and hyperplasias (5/5). Mixed mammary tumors had similar basal and luminal epithelial reactivity and also had proliferating spindle-shaped stromal cells that were reactive with 312C8-1 (10/12) and 13H5 (4/12). The adenocarcinomas were subclassified into basal, luminal, and basal/luminal on the basis of 312C8-1 reactivity (4/18), 13H5 reactivity (2/18), and dual reactivity with mutually exclusive anatomic distribution (11/18), respectively. Those tumors with dual immunoreactivity were indicative of noninvasive carcinomas. Dogs with neoplasms that were reactive with 312C8-1 and nonreactive with 13H5 had local recurrence or distant metastasis within 2 weeks to 6 months after diagnosis. Other antibodies used for comparison were pan cytokeratin AE1/AE3, actin HHF35, and vimentin. 312C8-1 and 13H5 antibodies are specific for canine mammary basal and luminal epithelium, respectively, and by employing these antibodies, the origin and differentiation of canine mammary neoplasms can be determined more accurately than on the basis of hematoxylin and eosin-stained tissue alone. C1 UNIV CALIF DAVIS,SCH VET MED,DEPT PATHOL,DAVIS,CA 95616. UNIV CALIF DAVIS,SCH VET MED,DEPT SURG,DAVIS,CA 95616. LAWRENCE BERKELEY LAB,DIV CELL & MOLEC BIOL,BERKELEY,CA 94720. RI Dairkee, Shanaz/D-6743-2012 NR 26 TC 34 Z9 35 U1 0 U2 2 PU AMER COLL VET PATHOLOGIST PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0300-9858 J9 VET PATHOL JI Vet. Pathol. PD MAR PY 1993 VL 30 IS 2 BP 155 EP 161 PG 7 WC Pathology; Veterinary Sciences SC Pathology; Veterinary Sciences GA KV429 UT WOS:A1993KV42900008 PM 7682368 ER PT J AU FREIMUTH, P ANDERSON, CW AF FREIMUTH, P ANDERSON, CW TI HUMAN ADENOVIRUS SEROTYPE-12 VIRION PRECURSORS PMU AND PVI ARE CLEAVED AT AMINO-TERMINAL AND CARBOXY-TERMINAL SITES THAT CONFORM TO THE ADENOVIRUS-2 ENDOPROTEINASE CLEAVAGE CONSENSUS SEQUENCE SO VIROLOGY LA English DT Article ID PROTEINASE; SPECIFICITY; TYPE-2 C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. FU NIAID NIH HHS [U01 AI26049] NR 28 TC 17 Z9 21 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 0042-6822 J9 VIROLOGY JI Virology PD MAR PY 1993 VL 193 IS 1 BP 348 EP 355 DI 10.1006/viro.1993.1131 PG 8 WC Virology SC Virology GA KN057 UT WOS:A1993KN05700035 PM 8438575 ER PT J AU WOOD, BD KELLER, CK JOHNSTONE, DL AF WOOD, BD KELLER, CK JOHNSTONE, DL TI INSITU MEASUREMENT OF MICROBIAL ACTIVITY AND CONTROLS ON MICROBIAL CO2 PRODUCTION IN THE UNSATURATED ZONE SO WATER RESOURCES RESEARCH LA English DT Article ID DISSOLVED ORGANIC-CARBON; POROUS-MEDIA; CLAYEY TILL; SUBSURFACE SEDIMENTS; SPATIAL VARIABILITY; SOUTH-CAROLINA; UNITED-STATES; GROUND-WATER; SOIL; DIOXIDE AB Carbon dioxide concentrations were measured at various depths and times in the unsaturated zones of two hydraulically and geochemically contrasting field sites, one in southeastern Washington state, and the other in south central Saskatchewan. In situ CO2 production rates were calculated from a mass balance that accounted for diffusive fluxes and partitioning of CO2 into an advecting aqueous phase. Production rates were compared with (1) microbial abundance and (2) subsurface temperature to determine whether subsurface CO2 production rates could be expressed as a simple function of these two variables. At the Washington site, subsurface production was successfully expressed as a function of microbial abundance and temperature for a large portion of the year, but not near the end of the growing season. Although subsurface microbes and organic carbon were more abundant at the Saskatchewan site, subsurface CO2 production rates were generally several orders of magnitude lower than at the Washington site, and no correlation could be established between microbial numbers, temperature, and production rate. The cases where production rates could not be expressed as a function of microbial numbers and temperature suggested conditions in which some other factor, such as nutrient limitations, was controlling. C1 WASHINGTON STATE UNIV, DEPT CIVIL & ENVIRONM ENGN, PULLMAN, WA 99164 USA. WASHINGTON STATE UNIV, DEPT GEOL, PULLMAN, WA 99164 USA. PACIFIC NW LAB, DEPT CIVIL & ENVIRONM ENGN, RICHLAND, WA 99352 USA. RI Keller, C/B-3205-2012; Wood, Brian/K-4025-2012; Wood, Brian/J-8362-2013 OI Wood, Brian/0000-0003-3152-7852; Wood, Brian/0000-0003-3152-7852 NR 73 TC 58 Z9 61 U1 1 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD MAR PY 1993 VL 29 IS 3 BP 647 EP 659 DI 10.1029/92WR02315 PG 13 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA KP943 UT WOS:A1993KP94300009 ER PT J AU LUND, O BARTOSZEK, L AF LUND, O BARTOSZEK, L TI LASER-BEAM CUTTING AND WELDING CREATES PRECISION, LIGHTWEIGHT STRUCTURE SO WELDING JOURNAL LA English DT Article C1 FERMILAB NATL ACCELERATOR LAB,DEPT SOLENOIDAL DETECTOR COLLABORAT,BATAVIA,IL 60510. RP LUND, O (reprint author), LASER MACHINING INC,SOMERSET,WI 54025, USA. NR 0 TC 1 Z9 1 U1 1 U2 1 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD MAR PY 1993 VL 72 IS 3 BP 71 EP 73 PG 3 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KP840 UT WOS:A1993KP84000011 ER PT J AU RUUD, CO JOSEF, JA SNOHA, DJ AF RUUD, CO JOSEF, JA SNOHA, DJ TI RESIDUAL-STRESS CHARACTERIZATION OF THICK-PLATE WELDMENTS USING X-RAY-DIFFRACTION SO WELDING JOURNAL LA English DT Article DE RESIDUAL STRESS; THICK PLATE; X-RAY DIFFRACTION; MULTIPASS WELDMENT; WELD-INDUCED STRESS; STRESS PATTERNS; ROLLED PLATE; SURFACE STRESS; YIELD STRENGTH ID INSTRUMENTATION AB The objective of this investigation was to measure the residual stress field in a thick multipass weldment using x-ray diffraction (XRD) techniques. The sample under study was a 13-in. (33-cm) thick, multipass, V-groove butt joint weldment of 2 1/4-Cr 1-Mo steel plate. Nearly 10,000 stress measurements were performed on the weldment, producing over 72 plots of stress traverses, to provide the most thorough experimental analysis of a weldment to date. The data indicate the complexity of the stress field in thick multipass weldments and the magnitude of the difficulties to be faced in developing numerical models for residual stresses in these weldments. This paper is restricted to reporting and discussing the welding-induced stress patterns on the rolled plate surface. It is these surfaces that are normally exposed for crack initiation. C1 LOS ALAMOS NATL LAB,DIV NUCL ENGN & TECHNOL,LOS ALAMOS,NM 87544. USA,MAT TECHNOL LAB,WATERTOWN,MA 02172. RP RUUD, CO (reprint author), PENN STATE UNIV,DEPT IND & MANAGEMENT SYST ENGN,UNIV PK,PA 16802, USA. NR 9 TC 3 Z9 3 U1 0 U2 1 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD MAR PY 1993 VL 72 IS 3 BP S87 EP S91 PG 5 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KP840 UT WOS:A1993KP84000013 ER PT J AU WILSON, RD WOODYARD, JR DEVLETIAN, JH AF WILSON, RD WOODYARD, JR DEVLETIAN, JH TI CAPACITOR DISCHARGE WELDING - ANALYSIS THROUGH ULTRAHIGH-SPEED PHOTOGRAPHY SO WELDING JOURNAL LA English DT Article DE CAPACITOR DISCHARGE; CWD; PHOTOGRAPHIC ANALYSIS; ULTRAHIGH SPEED; RSP ALLOYS; TRANSIENT PHENOMENA; EXPULSION; PLASMA JET; ANODE CATHODE HEAT; METAL SPATTER AB Ultrahigh-speed photography of 44,000 frames/s was used to investigate the capacitor discharge welding (CDW) process. The objective of the study was to use high-speed photography and a finite element computer program to help describe the heat flow characteristics of the CDW cycle. The photos revealed that the plasma jet from the cathode was responsible for expelling metal from the anode rather than being squeezed out on contact. Photographic evidence suggested that the unequal anode/cathode heating ratio is primarily due to heat transfer from the anode to the expelled metal particles. C1 OREGON GRAD INST SCI & TECHNOL,BEAVERTON,OR. RP WILSON, RD (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 14 TC 6 Z9 6 U1 1 U2 2 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD MAR PY 1993 VL 72 IS 3 BP S101 EP S106 PG 6 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KP840 UT WOS:A1993KP84000015 ER PT J AU RAWERS, JC KIKUCHI, M AF RAWERS, JC KIKUCHI, M TI NITROGEN CONCENTRATION IN FE-CR-MN ALLOYS SO ZEITSCHRIFT FUR METALLKUNDE LA English DT Article ID SOLUBILITY; IRON AB Nitrogen addition to iron alloys improves the mechanical properties. The composition of the alloy as well as the melt pressure can affect nitrogen concentration. In the present study, nitrogen concentrations in Fe - Cr - Mn alloys were determined. New thermodynamic expressions were derived to relate nitrogen concentration to alloy composition and melt pressure. These expressions include nonlinear terms, such as pressure-concentration and Cr - Mn terms. C1 TOKYO INST TECHNOL,MEGURO KU,TOKYO 152,JAPAN. RP RAWERS, JC (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU CARL HANSER VERLAG PI MUNICH PA KOLBERGERSTRASSE 22, POSTFACH 860420, W-8163 MUNICH, GERMANY SN 0044-3093 J9 Z METALLKD JI Z. Metallk. PD MAR PY 1993 VL 84 IS 3 BP 154 EP 159 PG 6 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KX159 UT WOS:A1993KX15900002 ER PT J AU TANAKA, T GOKCEN, NA MORITA, ZI IIDA, T AF TANAKA, T GOKCEN, NA MORITA, ZI IIDA, T TI THERMODYNAMIC RELATIONSHIP BETWEEN ENTHALPY OF MIXING AND EXCESS ENTROPY IN LIQUID BINARY-ALLOYS SO ZEITSCHRIFT FUR METALLKUNDE LA English DT Article AB A solution model for liquid binary alloys has been derived, based on the free volume theory considering excess volumes of the alloys. Excess entropy and excess Gibbs energy can be evaluated from the present model using values of enthalpy of mixing and excess volume. In addition, the relationship between enthalpy of mixing and excess entropy in liquid binary alloys has been interpreted based on the present model. C1 US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321. RP TANAKA, T (reprint author), OSAKA UNIV,FAC ENGN,DEPT MAT SCI & PROC,2-1 YAMADAOKA,SUITA,OSAKA 565,JAPAN. NR 28 TC 45 Z9 52 U1 0 U2 1 PU CARL HANSER VERLAG PI MUNICH PA KOLBERGERSTRASSE 22, POSTFACH 860420, W-8163 MUNICH, GERMANY SN 0044-3093 J9 Z METALLKD JI Z. Metallk. PD MAR PY 1993 VL 84 IS 3 BP 192 EP 199 PG 8 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KX159 UT WOS:A1993KX15900009 ER PT J AU MORAWITZ, H BOZOVIC I KRESIN, VZ RIETVELD, G VANDERMAREL, D AF MORAWITZ, H BOZOVIC, I KRESIN, VZ RIETVELD, G VANDERMAREL, D TI THE PLASMON DENSITY OF STATES OF A LAYERED ELECTRON-GAS SO ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER LA English DT Article ID SEMICONDUCTOR SUPERLATTICE; COLLECTIVE EXCITATIONS; SUPERCONDUCTIVITY AB The plasmon density of states (DOS) rho(omega) of a layered electron gas (LEG) is studied theoretically. It is shown that rho(omega) is a linear function of frequency omega as omega goes to 0, and then increases more rapidly as omega tends to the screened, three dimensional plasma frequency omega(p). We also study the partial densities of state for constant kappa and q(z), where kappa and q(z) are the magnitude of the transverse and perpendicular momentum transfers. A possible experimental probe for the plasmon DOS is discussed. C1 DELFT UNIV TECHNOL, FAC APPL PHYS, 2628 CJ DELFT, NETHERLANDS. VARIAN ASSOCIATES INC, RES CTR, PALO ALTO, CA 94303 USA. LAWRENCE BERKELEY LAB, DIV MAT & CHEM PHYS, BERKELEY, CA 94720 USA. RP MORAWITZ, H (reprint author), IBM CORP, ALMADEN RES CTR, 650 HARRY RD, SAN JOSE, CA 95120 USA. RI van der Marel, Dirk/G-4618-2012 OI van der Marel, Dirk/0000-0001-5266-9847 NR 19 TC 21 Z9 21 U1 0 U2 1 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0722-3277 J9 Z PHYS B CON MAT JI Z. Phys. B-Condens. Mat. PD MAR PY 1993 VL 90 IS 3 BP 277 EP 281 DI 10.1007/BF01433048 PG 5 WC Physics, Condensed Matter SC Physics GA KM772 UT WOS:A1993KM77200004 ER PT J AU BACHLER, J BARTKE, J BIALKOWSKA, H BOCK, R BROCKMANN, R BUNCIC, P CHASE, SI DERADO, I ECKARDT, V ESCHKE, J FERENC, D FLEISCHMANN, B FUCHS, M GAZDZICKI, M GEBAUER, HJ GLADYSZ, E HARRIS, JW HECK, W HOFFMANN, M KABANA, S KADIJA, K KEIDEL, R KOSIEC, J KOWALSKI, M KUHMICHEL, A LAHANAS, M LEE, Y LEVINE, M LJUBICIC, A MARGETIS, S NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PFENNING, J PIPER, A POSA, F PUGH, HG PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R ROLAND, G ROHRICH, D ROTHARD, H RUNGE, K SANDOVAL, A SCHMIDT, E SCHMITZ, N SCHMOETTEN, E SCHNEIDER, I SEYBOTH, P SEYERLEIN, J SKRZYPCZAK, E STEFANSKI, P STOCK, R STROBELE, H TEITELBAUM, L TONSE, S VASSILEIADIS, G VESZTERGOMBI, G VRANIC, D WENIG, S WOSIEK, B AF BACHLER, J BARTKE, J BIALKOWSKA, H BOCK, R BROCKMANN, R BUNCIC, P CHASE, SI DERADO, I ECKARDT, V ESCHKE, J FERENC, D FLEISCHMANN, B FUCHS, M GAZDZICKI, M GEBAUER, HJ GLADYSZ, E HARRIS, JW HECK, W HOFFMANN, M KABANA, S KADIJA, K KEIDEL, R KOSIEC, J KOWALSKI, M KUHMICHEL, A LAHANAS, M LEE, Y LEVINE, M LJUBICIC, A MARGETIS, S NAPPI, E ODYNIEC, G PAIC, G PANAGIOTOU, AD PETRIDIS, A PFENNING, J PIPER, A POSA, F PUGH, HG PUHLHOFER, F RAI, G RAUCH, W RENFORDT, R ROLAND, G ROHRICH, D ROTHARD, H RUNGE, K SANDOVAL, A SCHMIDT, E SCHMITZ, N SCHMOETTEN, E SCHNEIDER, I SEYBOTH, P SEYERLEIN, J SKRZYPCZAK, E STEFANSKI, P STOCK, R STROBELE, H TEITELBAUM, L TONSE, S VASSILEIADIS, G VESZTERGOMBI, G VRANIC, D WENIG, S WOSIEK, B TI MULTIPLICITY DISTRIBUTIONS IN SMALL PHASE-SPACE DOMAINS IN CENTRAL NUCLEUS-NUCLEUS COLLISIONS SO ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS LA English DT Article ID CHARGED-PARTICLE MULTIPLICITIES; HIGH-ENERGY; HADRON-COLLISIONS; INTERMITTENCY; COLLIDER AB Multiplicity distributions of negatively charged particles have been studied in restricted phase space intervals for central S + S, O + Au and S + Au collisions at 200 GeV/nucleon. It is shown that multiplicity distributions are well described by a negative binomial form irrespectively of the size and dimensionality of phase space domain. A clan structure analysis reveals interesting similarities between complex nuclear collisions and a simple partonic shower. The lognormal distribution agrees reasonably well with the multiplicity data in large domains, but fails in the case of small intervals. No universal scaling function was found to describe the shape of multiplicity distributions in phase space intervals of varying size. C1 UNIV BARI,INFN,SEZIONE BARI,I-70124 BARI,ITALY. GSI DARMSTADT,DARMSTADT,GERMANY. UNIV BARI,DIPARTIMENTO FIS,I-70124 BARI,ITALY. FAK PHYS FREIBURG,FREIBURG,GERMANY. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. MAX PLANCK INST PHYS & ASTROPHYS,MUNICH,GERMANY. CERN,CH-1211 GENEVA 23,SWITZERLAND. UNIV FRANKFURT,FACHBEREICH PHYS,W-6000 FRANKFURT,GERMANY. INST NUCL PHYS,WARSAW,POLAND. INST NUCL PHYS,PL-31342 KRAKOW,POLAND. RUDJER BOSKOVIC INST,YU-41001 ZAGREB,CROATIA. INST EXPTL PHYS,WARSAW,POLAND. UNIV MARBURG,FACHBEREICH PHYS,W-3550 MARBURG,GERMANY. RP BACHLER, J (reprint author), UNIV ATHENS,DEPT PHYS,ATHENS,GREECE. NR 39 TC 20 Z9 20 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-9739 J9 Z PHYS C PART FIELDS JI Z. Phys. C-Part. Fields PD MAR PY 1993 VL 57 IS 4 BP 541 EP 550 PG 10 WC Physics, Particles & Fields SC Physics GA KT652 UT WOS:A1993KT65200002 ER PT J AU CSANAK, G CARTWRIGHT, DC TRAJMAR, S AF CSANAK, G CARTWRIGHT, DC TRAJMAR, S TI MAGNETIC-SUBLEVEL DIFFERENTIAL CROSS-SECTIONS FOR ELECTRON-IMPACT EXCITATION OF HE NP-1 LEVELS - THEORY AND EXPERIMENT IN NATURAL AND ATOMIC COORDINATE FRAMES SO ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS LA English DT Article ID PHOTON ANGULAR-CORRELATIONS; EXPERIMENTAL-THEORETICAL COMPARISONS; HELIUM COLLISIONS; 21P STATE; ORIENTATION; ALIGNMENT; AMPLITUDES; SCATTERING; POLARIZATION; PARAMETERS AB Experimental data for the average transferred angular momentum, [L(perpendicular-to)], have been combined with experimental differential cross section [DCS] data for electron impact excitation of the 2(1)P and 3(1)P levels of helium to obtain the individual magnetic-sublevel differential cross-sections, [DCS(M)n], in the natural (and atomic) coordinate system. First-order many-body theory (FOMBT) has been used to obtain corresponding theoretical predictions for DCS(M)n which are compared to these results. This comparison shows that FOMBT generally predicts M = +1 sublevel excitation DCS better than that for M = -1. C1 JET PROP LAB,PASADENA,CA 91109. RP CSANAK, G (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 40 TC 1 Z9 1 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0178-7683 J9 Z PHYS D ATOM MOL CL JI Z. Phys. D-Atoms Mol. Clusters PD MAR PY 1993 VL 25 IS 4 BP 327 EP 336 PG 10 WC Physics, Atomic, Molecular & Chemical SC Physics GA KT550 UT WOS:A1993KT55000009 ER PT J AU WRIGHT, SI ADAMS, BL KUNZE, K AF WRIGHT, SI ADAMS, BL KUNZE, K TI APPLICATION OF A NEW AUTOMATIC LATTICE ORIENTATION MEASUREMENT TECHNIQUE TO POLYCRYSTALLINE ALUMINUM SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID DEFORMATION; COHERENCE AB The power of a fully automatic system for measuring lattice orientation in the scanning electron microscope is demonstrated. The system couples automatic analysis of electron backscattering diffraction patterns with precise movement of a computer-controlled stage. Over 100 000 lattice orientations were measured on 40% channel-die compressed aluminum. The texture calculated from these measurements closely matched the expected rolling texture. The value of this technique for exploring the relationships between lattice orientation and morphology in polycrystalline microstructures is demonstrated by reconstructing grain boundary maps from the measurements and using color to visualize particular orientations. It is also shown that the average grain shape for a particular orientation can be recovered from the measurements using statistical measures of spatial orientation correlation. C1 BRIGHAM YOUNG UNIV,DEPT MFG ENGN,PROVO,UT 84602. RP WRIGHT, SI (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. RI Kunze, Karsten/B-8561-2013 OI Kunze, Karsten/0000-0003-4682-8017 NR 12 TC 39 Z9 39 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD FEB 28 PY 1993 VL 160 IS 2 BP 229 EP 240 DI 10.1016/0921-5093(93)90452-K PG 12 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA KR303 UT WOS:A1993KR30300009 ER PT J AU HOUF, WG GRCAR, JF BREILAND, WG AF HOUF, WG GRCAR, JF BREILAND, WG TI A MODEL FOR LOW-PRESSURE CHEMICAL VAPOR-DEPOSITION IN A HOT-WALL TUBULAR REACTOR SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT Symposium on Chemistry for Electronic Materials, at the 1992 Spring Meeting of the European-Materials-Research-Society Conference CY JUN 02-05, 1992 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, BANQUE POPULAIRE, BRASSERIE KRONENBOURG, CTR RECH NUCL, CNRS, ELSEVIER SCI PUBL, OFF TOURISME VILLE STRASBOURG, EUROPEAN PARLIAMENT ID SILICON; SILANE; CVD AB A general fundamental model for low pressure chemical vapor deposition in a multiwafer reactor has been developed and evaluated in terms of its ability to predict polycrystalline silicon growth rate data from a commercial reactor. The model incorporates a fundamental description of the chemical kinetics of silane based on molecular beam measurements for the reactive sticking coefficient of silane on silicon. Predictions from the model are found to be in excellent agreement with the reactor deposition data for a wide range of typical operating conditions. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP HOUF, WG (reprint author), SANDIA NATL LABS,LIVERMORE,CA 94551, USA. NR 22 TC 25 Z9 25 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD FEB 28 PY 1993 VL 17 IS 1-3 BP 163 EP 171 DI 10.1016/0921-5107(93)90100-2 PG 9 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KR387 UT WOS:A1993KR38700030 ER PT J AU SOMERVILLE, CR AF SOMERVILLE, CR TI NEW OPPORTUNITIES TO DISSECT AND MANIPULATE PLANT PROCESSES SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES B-BIOLOGICAL SCIENCES LA English DT Article ID POLYMORPHISM LINKAGE MAP; CHALCONE SYNTHASE GENE; ARABIDOPSIS-THALIANA; HOMOLOGOUS RECOMBINATION; PROTEIN; GENOME; DNA; TRANSFORMATION; SUPPRESSION; RESISTANCE AB The use of transgenic plants has become a standard tool of experimental plant biology and is changing many approaches to plant improvement. The technology has greatly expanded the range of methods available to isolate and identify new plants genes, and has permitted great strides in understanding the mechanisms which regulate gene expression. In addition, the ability to use cloned genes to alter the functional expression of the gene in transgenic plants has created entirely novel opportunities to examine the biological role of virtually any cellular constituent. RP SOMERVILLE, CR (reprint author), MICHIGAN STATE UNIV,US DOE,PLANT RES LAB,E LANSING,MI 48824, USA. RI Somerville, Christopher/A-4048-2009 OI Somerville, Christopher/0000-0003-4647-0094 NR 47 TC 2 Z9 2 U1 1 U2 2 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 0962-8436 J9 PHILOS T ROY SOC B JI Philos. Trans. R. Soc. Lond. Ser. B-Biol. Sci. PD FEB 27 PY 1993 VL 339 IS 1288 BP 199 EP 206 DI 10.1098/rstb.1993.0017 PG 8 WC Biology SC Life Sciences & Biomedicine - Other Topics GA KQ522 UT WOS:A1993KQ52200008 ER PT J AU HARRIS, RA PRATT, L AF HARRIS, RA PRATT, L TI A SIMPLE EFFECTIVE HAMILTONIAN FOR LOW-FREQUENCY LINEAR RESPONSES SO CHEMICAL PHYSICS LETTERS LA English DT Article AB It is shown that low-frequency linear responses may be obtained formally from second-order stationary state perturbation theory through the use of effective potentials. The effective potentials are related to time averages of Heisenberg operators. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP HARRIS, RA (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Pratt, Lawrence/H-7955-2012 OI Pratt, Lawrence/0000-0003-2351-7451 NR 12 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD FEB 26 PY 1993 VL 203 IS 4 BP 399 EP 403 DI 10.1016/0009-2614(93)85588-F PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KN047 UT WOS:A1993KN04700014 ER PT J AU VINCENT, MA CONNOR, JNL GORDON, MS SCHATZ, GC AF VINCENT, MA CONNOR, JNL GORDON, MS SCHATZ, GC TI ABINITIO ELECTRONIC-STRUCTURE CALCULATIONS OF STATIONARY-POINTS AND BARRIER HEIGHTS FOR THE CLHCL AND HCL2 SYSTEMS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID POTENTIAL-ENERGY SURFACE; ATOM-TRANSFER-REACTIONS; SUDDEN DISTORTED-WAVE; PLESSET PERTURBATION-THEORY; TRANSITION-STATE THEORY; PHOTODETACHMENT SPECTRUM; REACTIONS CL+HCL->CLH+CL; OSCILLATING REACTIVITY; DYNAMICAL PROPERTIES; CROSS-SECTIONS AB Properties of the stationary points on the potential energy surface of the ClHCl and HCl2 systems have been calculated by several ab initio methods using large basis sets with extensive treatment of electron correlation. The most accurate results are consistent with experimental barrier estimates for the H + Cl2-->HCl + Cl and Cl + HCl-->ClH + Cl reactions. C1 N DAKOTA STATE UNIV,DEPT CHEM,FARGO,ND 58105. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. ARGONNE NATL LAB,THEORET CHEM GRP,ARGONNE,IL 60439. NORTHWESTERN UNIV,DEPT CHEM,EVANSTON,IL 60208. RP VINCENT, MA (reprint author), UNIV MANCHESTER,DEPT CHEM,MANCHESTER M13 9PL,LANCS,ENGLAND. NR 65 TC 21 Z9 21 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD FEB 26 PY 1993 VL 203 IS 4 BP 415 EP 422 DI 10.1016/0009-2614(93)85591-B PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KN047 UT WOS:A1993KN04700017 ER PT J AU RAFTERY, D REVEN, L LONG, H PINES, A TANG, P REIMER, JA AF RAFTERY, D REVEN, L LONG, H PINES, A TANG, P REIMER, JA TI SPIN-POLARIZED XE-129 NMR-STUDY OF A POLYMER SURFACE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; NA-Y ZEOLITE; CHEMICAL-SHIFT; MOLECULAR-SIEVES; SOLID POLYMERS; XENON; SPECTROSCOPY; PROBE; GAS; TEMPERATURE AB A method for NMR studies of low surface area materials using optically pumped xenon gas is described. The method has been used to investigate spin-polarized xenon adsorbed onto poly(acrylic acid). The temperature dependence of the xenon-surface interaction, as measured by the xenon chemical shifts extrapolated to zero pressure, is shown to be consistent with a simple model of chemical exchange between the gas and adsorbed phases. The magnitude of the surface contribution to the Xe-129 chemical shift indicates a relatively strong interaction between xenon and poly(acrylic acid), possibly due to the polar carboxylic acid functional groups at the polymer surface. From the pressure dependence of the Xe-129 shift, the diffusion coefficient of xenon on poly(acrylic acid) is estimated to be 3.3 x 10(-5) cm2/s. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RI Reven, Linda/F-3679-2011 NR 48 TC 53 Z9 53 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 25 PY 1993 VL 97 IS 8 BP 1649 EP 1655 DI 10.1021/j100110a029 PG 7 WC Chemistry, Physical SC Chemistry GA KP603 UT WOS:A1993KP60300029 ER PT J AU TACKLEY, PJ STEVENSON, DJ GLATZMAIER, GA SCHUBERT, G AF TACKLEY, PJ STEVENSON, DJ GLATZMAIER, GA SCHUBERT, G TI EFFECTS OF AN ENDOTHERMIC PHASE-TRANSITION AT 670 KM DEPTH IN A SPHERICAL MODEL OF CONVECTION IN THE EARTHS MANTLE SO NATURE LA English DT Article ID LONG-WAVELENGTH HETEROGENEITY; NORTHWEST PACIFIC; ISLAND ARCS; MGSIO3 PEROVSKITE; SLAB; LITHOSPHERE; PREDOMINANCE; GENERATION AB Numerical modelling of mantle convection in a spherical shell with an endothermic phase change at 670 km depth reveals an inherently three-dimensional flow pattern, containing cylindrical plumes and linear sheets which behave differently in their ability to penetrate the phase change. The dynamics are dominated by accumulation of downwelling cold material above 670 km depth, resulting in frequent avalanches of upper-mantle material into the lower mantle. This process generates long-wavelength lateral heterogeneity, helping to resolve the contradiction between seismic tomographic observations and expectations from mantle convection simulations. C1 CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125. LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,INST GEOPHYS & PLANETARY PHYS,LOS ALAMOS,NM 87545. UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,INST GEOPHYS & PLANETARY PHYS,LOS ANGELES,CA 90024. RP TACKLEY, PJ (reprint author), CALTECH,SEISMOL LAB,PASADENA,CA 91125, USA. RI Tackley, Paul/D-8155-2016 OI Tackley, Paul/0000-0003-4878-621X NR 49 TC 409 Z9 409 U1 2 U2 40 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD FEB 25 PY 1993 VL 361 IS 6414 BP 699 EP 704 DI 10.1038/361699a0 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KN789 UT WOS:A1993KN78900046 ER PT J AU DUNAWAY, M OSTRANDER, EA AF DUNAWAY, M OSTRANDER, EA TI LOCAL DOMAINS OF SUPERCOILING ACTIVATE A EUKARYOTIC PROMOTER INVIVO SO NATURE LA English DT Article ID TRANSCRIPTION FACTOR; XENOPUS-LAEVIS; DNA; GENE; ENHANCER; POLYMERASE; TEMPLATE; OOCYTES; PROTEIN AB EXPERIMENTS Correlating template topology with transcriptional activity suggest that DNA topology plays a role in eukaryotic gene expression1-4. Linear templates transfected into cultured cells produce far fewer transcripts than do circular transcription templates3, and no transcripts can be detected from linear templates injected into Xenopus oocytes1,2. Further, when transcriptionally active circular templates in Xenopus oocytes are linearized by injection of a restriction enzyme, transcription dramatically decreases. Here we show that transcription by phage T7 RNA polymerase from a divergent promoter can partially replace the requirement for circular Xenopus ribosomal RNA transcription templates in Xenopus oocytes. Supercoiled domains can apparently be generated on short pieces of DNA having no known sequences that result in association with the nuclear architecture, suggesting that localized, transient domains of supercoiling fulfil the minimum topological needs for Xenopus rRNA transcription in vivo. C1 LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,DEPT CELLULAR & MOLEC BIOL,BERKELEY,CA 94720. RP DUNAWAY, M (reprint author), UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,DIV BIOCHEM & MOLEC BIOL,BERKELEY,CA 94720, USA. OI Ostrander, Elaine/0000-0001-6075-9738 NR 18 TC 66 Z9 66 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD FEB 25 PY 1993 VL 361 IS 6414 BP 746 EP 748 DI 10.1038/361746a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KN789 UT WOS:A1993KN78900063 PM 8441472 ER PT J AU GOODWIN, PM JOHNSON, ME MARTIN, JC AMBROSE, WP MARRONE, BL JETT, JH KELLER, RA AF GOODWIN, PM JOHNSON, ME MARTIN, JC AMBROSE, WP MARRONE, BL JETT, JH KELLER, RA TI RAPID SIZING OF INDIVIDUAL FLUORESCENTLY STAINED DNA FRAGMENTS BY FLOW-CYTOMETRY SO NUCLEIC ACIDS RESEARCH LA English DT Article ID GEL-ELECTROPHORESIS AB Large, fluorescently stained restriction fragments of lambda phage DNA are sized by passing individual fragments through a focused continuous wave laser beam in an ultrasensitive flow cytometer at a rate of 60 fragments per second. The size of the fluorescence burst emitted by each stained DNA fragment, as it passes through the laser beam, is measured in one millisecond. One hundred sixty four seconds of fluorescence burst data allow linear sizing of DNA with an accuracy of better than two percent over a range of 10 to 50 kbp. This corresponds to analyzing less than 1 pg of DNA. Sizing of DNA fragments by this approach is much faster, requires much less DNA, and can potentially analyze large fragments with better resolution and accuracy than with gel-based electrophoresis. C1 LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545. LOS ALAMOS NATL LAB,DIV LIFE SCI,LOS ALAMOS,NM 87545. FU NCRR NIH HHS [RR 01315] NR 20 TC 109 Z9 110 U1 2 U2 8 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD FEB 25 PY 1993 VL 21 IS 4 BP 803 EP 806 DI 10.1093/nar/21.4.803 PG 4 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KR189 UT WOS:A1993KR18900002 PM 8451182 ER PT J AU WONG, CW WONG, CY AF WONG, CW WONG, CY TI NONAPPEARANCE OF DEHNEN-SHAHIN RESONANCES IN THE POSITRONIUM CONTINUUM SO PHYSICS LETTERS B LA English DT Article ID STATE QUANTUM ELECTRODYNAMICS; HEAVY-ION COLLISIONS; NARROW RESONANCES; SYSTEMS AB The Dehnen-Shahin relativistic equations for the positronium are found to have no resonant solutions in both the S-1(0) and the P-3(0) positronium continua. A certain pole singularity appearing in the S-1(0) potential gives rise to resonances, but only if the electromagnetic interaction strength is increased 160-fold or more. These resonances are found to have zero width. However, the same singularity, even in a weak potential, gives unacceptable nonphysical bound states near zero energy. The strange similarity of Spence-Vary P-3(0) resonances to resonances in an infinite square-well potential is noted. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP WONG, CW (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 28 TC 7 Z9 7 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 FEB 25 PY 1993 VL 301 IS 1 BP 1 EP 5 PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KM924 UT WOS:A1993KM92400001 ER PT J AU NEUBERT, M LIGETI, Z NIR, Y AF NEUBERT, M LIGETI, Z NIR, Y TI QCD SUM-RULE ANALYSIS OF THE SUBLEADING ISGUR-WISE FORM FACTOR-CHI-2-UPSILON.UPSILON' SO PHYSICS LETTERS B LA English DT Article ID RESONANCE PHYSICS; HEAVY MESONS; QUARK; DECAYS AB We present a QCD sum rule calculation of the spin-symmetry violating universal function chi2(upsilon.upsilon'), which appears at order 1/m(Q) in the heavy quark expansion of meson form factors. This function vanishes in the standard approximation, where radiative effects are neglected. For the first time, the complete set of diagrams arising at order alpha(s) is evaluated. In particular, we find chi2(1) = -(3.8 +/- 1.1)% at zero recoil, indicating that 1/m(Q) corrections induced by the chromo-magnetic moment operator are small. C1 WEIZMANN INST SCI,DEPT PHYS,IL-76100 REHOVOT,ISRAEL. RP NEUBERT, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 23 TC 29 Z9 29 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 FEB 25 PY 1993 VL 301 IS 1 BP 101 EP 107 DI 10.1016/0370-2693(93)90728-Z PG 7 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KM924 UT WOS:A1993KM92400019 ER PT J AU ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARMINATI, F CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUGAS, A GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SCHREIBER, HJ SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHOTKIN, S SHUKLA, J SHUMILOV, E SHOUTKO, V SODERSTROM, E SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC AF ADRIANI, O AGUILARBENITEZ, M AHLEN, S ALCARAZ, J ALOISIO, A ALVERSON, G ALVIGGI, MG AMBROSI, G AN, Q ANDERHUB, H ANDERSON, AL ANDREEV, VP ANGELOV, T ANTONOV, L ANTREASYAN, D ARCE, P AREFIEV, A ATAMANCHUK, A AZEMOON, T AZIZ, T BABA, PVKS BAGNAIA, P BAKKEN, JA BAKSAY, L BALL, RC BANERJEE, S BAO, J BARILLERE, R BARONE, L BASCHIROTTO, A BATTISTON, R BAY, A BECATTINI, F BECKER, U BEHNER, F BEHRENS, J BEINGESSNER, S BENCZE, GL BERDUGO, J BERGES, P BERTUCCI, B BETEV, BL BIASINI, M BILAND, A BILEI, GM BIZZARRI, R BLAISING, JJ BOBBINK, GJ BOCCIOLINI, M BOCK, R BOHM, A BORGIA, B BOSETTI, M BOURILKOV, D BOURQUIN, M BOUTIGNY, D BOUWENS, B BRAMBILLA, E BRANSON, JG BROCK, IC BROOKS, M BUISSON, C BUJAK, A BURGER, JD BURGER, WJ BUSENITZ, J CAI, XD CAPELL, M CARIA, M CARLINO, G CARMINATI, F CARTACCI, AM CASTELLO, R CERRADA, M CESARONI, F CHANG, YH CHATURVEDI, UK CHEMARIN, M CHEN, A CHEN, C CHEN, GM CHEN, HF CHEN, HS CHEN, J CHEN, M CHEN, ML CHEN, WY CHIEFARI, G CHIEN, CY CHMEISSANI, M CHOI, MT CHUNG, S CIVININI, C CLARE, I CLARE, R COAN, TE COHN, HO COIGNET, G COLINO, N CONTIN, A CRIJNS, F CUI, XT CUI, XY DAI, TS DALESSANDRO, R DEASMUNDIS, R DEGRE, A DEITERS, K DENES, E DENES, P DENOTARISTEFANI, F DHINA, M DIBITONTO, D DIEMOZ, M DIMITROV, HR DIONISI, C DOVA, MT DRAGO, E DRIEVER, T DUCHESNEAU, D DUINKER, P DURAN, I EASO, S ELMAMOUNI, H ENGLER, A EPPLING, FJ ERNE, FC EXTERMANN, P FABBRETTI, R FABRE, M FALCIANO, S FAN, SJ FACKLER, O FAY, J FELCINI, M FERGUSON, T FERNANDEZ, D FERNANDEZ, G FERRONI, F FESEFELDT, H FIANDRINI, E FIELD, J FILTHAUT, F FINOCCHIARO, G FISHER, PH FORCONI, G FOREMAN, T FREUDENREICH, K FRIEBEL, W FUKUSHIMA, M GAILLOUD, M GALAKTIONOV, Y GALLO, E GANGULI, SN GARCIAABIA, P GAU, SS GELE, D GENTILE, S GOLDFARB, S GONG, ZF GONZALEZ, E GOTTLICHER, P GOUGAS, A GOUJON, D GRATTA, G GRINNELL, C GRUENEWALD, M GU, C GUANZIROLI, M GUO, JK GUPTA, VK GURTU, A GUSTAFSON, HR GUTAY, LJ HANGARTER, K HASAN, A HAUSCHILDT, D HE, CF HEBBEKER, T HEBERT, M HERTEN, U HERVE, A HILGERS, K HOFER, H HOORANI, H HU, G HU, GQ ILLE, B ILYAS, MM INNOCENTE, V JANSSEN, H JEZEQUEL, S JIN, BN JONES, LW KASSER, A KHAN, RA KAMYSHKOV, Y KAPINOS, P KAPUSTINSKY, JS KARYOTAKIS, Y KAUR, M KHOKHAR, S KIENZLEFOCACCI, MN KIM, JK KIM, SC KIM, YG KINNISON, WW KIRKBY, D KIRSCH, S KITTEL, W KLIMENTOV, A KONIG, AC KOFFEMAN, E KORNADT, O KOUTSENKO, V KOULBARDIS, A KRAEMER, RW KRAMER, T KRASTEV, VR KRENZ, W KRIVSHICH, A KUIJTEN, H KUMAR, KS KUNIN, A LANDI, G LANSKE, D LANZANO, S LEBRUN, P LECOMTE, P LECOQ, P LECOULTRE, P LEE, DM LEEDOM, I LEGOFF, JM LEISTE, R LENTI, M LEONARDI, E LETTRY, J LEYTENS, X LI, C LI, HT LI, PJ LI, XG LIAO, JY LIN, WT LIN, ZY LINDE, FL LINDEMANN, B LINNHOFER, D LISTA, L LIU, Y LOHMANN, W LONGO, E LU, YS LUBBERS, JM LUBELSMEYER, K LUCI, C LUCKEY, D LUDOVICI, L LUMINARI, L LUSTERMANN, W MA, JM MA, WG MACDERMOTT, M MALHOTRA, PK MALIK, R MALININ, A MANA, C MAO, DN MAO, YF MAOLINBAY, M MARCHESINI, P MARION, F MARIN, A MARTIN, JP MARTINEZLASO, L MARZANO, F MASSARO, GGG MATSUDA, T MAZUMDAR, K MCBRIDE, P MCMAHON, T MCNALLY, D MERK, M MEROLA, L MESCHINI, M METZGER, WJ MI, Y MILLS, GB MIR, Y MIRABELLI, G MNICH, J MOLLER, M MONTELEONI, B MORAND, R MORGANTI, S MOULAI, NE MOUNT, R MULLER, S NADTOCHY, A NAGY, E NAPOLITANO, M NESSITEDALDI, F NEWMAN, H NEYER, C NIAZ, MA NIPPE, A NOWAK, H ORGANTINI, G PANDOULAS, D PAOLETTI, S PAOLUCCI, P PASSALEVA, G PATRICELLI, S PAUL, T PAULUZZI, M PAUSS, F PEI, YJ PENSOTTI, S PERRETGALLIX, D PERRIER, J PEVSNER, A PICCOLO, D PIERI, M PIROUE, PA PLASIL, F PLYASKIN, V POHL, M POJIDAEV, V PRODUIT, N QIAN, JM QURESHI, KN RAGHAVAN, R RAHALCALLOT, G RANCOITA, PG RATTAGGI, M RAVEN, G RAZIS, P READ, K REN, D REN, Z RESCIGNO, M REUCROFT, S RICKER, A RIEMANN, S RIEMERS, BC RILES, K RIND, O RIZVI, HA RODRIGUEZ, FJ ROE, BP ROHNER, M ROHNER, S ROMERO, L ROSE, J ROSIERLEES, S ROSMALEN, R ROSSELET, P RUBBIA, A RUBIO, JA RYKACZEWSKI, H SACHWITZ, M SALICIO, J SALICIO, JM SANDERS, GS SANTOCCHIA, A SARAKINOS, MS SARTORELLI, G SASSOWSKY, M SAUVAGE, G SCHEGELSKY, V SCHMITZ, D SCHMITZ, P SCHNEEGANS, M SCHOLZ, N SCHOPPER, H SCHOTANUS, DJ SCHREIBER, HJ SCHULTE, R SCHULTE, S SCHULTZE, K SCHWENKE, J SCHWERING, G SCIACCA, C SCOTT, I SEHGAL, R SEILER, PG SENS, JC SERVOLI, L SHEER, I SHEN, DZ SHEVCHENKO, S SHI, XR SHOTKIN, S SHUKLA, J SHUMILOV, E SHOUTKO, V SODERSTROM, E SON, D SOPCZAK, A SPARTIOTIS, C SPICKERMANN, T SPILLANTINI, P STAROSTA, R STEUER, M STICKLAND, DP STICOZZI, F STONE, H STRAUCH, K STRINGFELLOW, BC SUDHAKAR, K SULTANOV, G SUMNER, RL SUN, LZ SUTER, H SUTTON, RB SWAIN, JD SYED, AA TANG, XW TAYLOR, L TERZI, G TIMMERMANS, C TING, SCC TING, SM TONUTTI, M TONWAR, SC TOTH, J TSAREGORODTSEV, A TSIPOLITIS, G TULLY, C TUNG, KL ULBRICHT, J URBAN, L UWER, U VALENTE, E VANDEWALLE, RT VETLITSKY, I VIERTEL, G VIKAS, P VIKAS, U VIVARGENT, M VOGEL, H VOGT, H VOROBIEV, I VOROBYOV, AA VUILLEUMIER, L WADHWA, M WALLRAFF, W WANG, CR WANG, GH WANG, JH WANG, XL WANG, YF WANG, ZM WEBER, A WEBER, J WEILL, R WENAUS, TJ WENNINGER, J WHITE, M WILLMOTT, C WITTGENSTEIN, F WRIGHT, D WU, RJ WU, SX WU, YG WYSLOUCH, B XIE, YY XU, YD XU, ZZ XUE, ZL YAN, DS YAN, XJ YANG, BZ YANG, CG YANG, G YANG, KS YANG, QY YANG, ZQ YE, CH YE, JB YE, Q YEH, SC YIN, ZW YOU, JM YUNUS, N YZERMAN, M ZACCARDELLI, C ZEMP, P ZENG, M ZENG, Y ZHANG, DH ZHANG, ZP ZHOU, B ZHOU, JF ZHU, RY ZHUANG, HL ZICHICHI, A VANDERZWAAN, BCC TI DETERMINATION OF QUARK ELECTROWEAK COUPLINGS FROM DIRECT PHOTON PRODUCTION IN HADRONIC Z-DECAYS SO PHYSICS LETTERS B LA English DT Article ID FINAL-STATE PHOTONS; LUND MONTE-CARLO; E+E ANNIHILATION; JET FRAGMENTATION; PHYSICS AB We report on a comparison of isolated hard photon production in hadronic Z decays with the predictions of a next-to-leading order matrix-element calculation. We constrain the quark electroweak couplings to the Z boson with a simultaneous fit to three direct photon distributions, and combine this result with an independent constraint from our measurement of the total hadronic width of the Z, obtaining c(u) = 0.92 +/- 0.22 and c(d) = 1.63 +/- 0.15 where c(u,d) = 4(g(V)2BAR + g(A)2BAR)u,d. Our results are consistent with standard model predictions. C1 UNIV FLORENCE, I-50125 FLORENCE, ITALY. CTR INVEST ENERGET MEDIOAMBIENTALES & TECNOL, E-28040 MADRID, SPAIN. BOSTON UNIV, BOSTON, MA 02215 USA. CERN, EUROPEAN LAB PARTICLE PHYS, CH-1211 GENEVA 23, SWITZERLAND. INFN, I-80125 NAPLES, ITALY. UNIV NAPLES, I-80125 NAPLES, ITALY. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. INFN, I-06100 PERUGIA, ITALY. UNIV PERUGIA, I-06100 PERUGIA, ITALY. FBLJA PROJECT, WORLD LAB, CH-1211 GENEVA 23, SWITZERLAND. SWISS FED INST TECHNOL, CH-8093 ZURICH, SWITZERLAND. MIT, CAMBRIDGE, MA 02139 USA. ST PETERSBURG NUC PHYS INST, ST PETERSBURG, RUSSIA. BULGARIAN ACAD SCI, INST MECHATRONICS, BU-1113 SOFIA, BULGARIA. INFN, I-40126 BOLOGNA, ITALY. MOSCOW THEORET & EXPTL PHYS INST, 117259 MOSCOW, RUSSIA. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. TATA INST FUNDAMENTAL RES, BOMBAY 400005, INDIA. RHEIN WESTFAL TH AACHEN, INST PHYS 1, W-5100 AACHEN, GERMANY. RHEIN WESTFAL TH AACHEN, INST PHYS 2, W-5100 AACHEN, GERMANY. INFN, I-00185 ROME, ITALY. UNIV ROME LA SAPIENZA, I-00185 ROME, ITALY. PRINCETON UNIV, PRINCETON, NJ 08544 USA. UNIV ALABAMA, TUSCALOOSA, AL 35486 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. INFN, I-20133 MILAN, ITALY. UNIV GENEVA, CH-1211 GENEVA 4, SWITZERLAND. LAB ANNECY LE VIEUX PHYS PARTICULES, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, F-74941 ANNECY LE VIEUX, FRANCE. HUNGARIAN ACAD SCI, CENT RES INST PHYS, H-1525 BUDAPEST 114, HUNGARY. NIKHEF, NATL INST HIGH ENERGY PHYS, 1009 DB AMSTERDAM, NETHERLANDS. CATHOLIC UNIV NIJMEGEN, NIJMEGEN, NETHERLANDS. NATL INST NUCL PHYS & HIGH ENERGY PHYS, 6525 ED NIJMEGEN, NETHERLANDS. UNIV CALIF SAN DIEGO, SAN DIEGO, CA 92182 USA. CARNEGIE MELLON UNIV, PITTSBURGH, PA 15213 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87544 USA. UNIV LYON 1, INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, INST PHYS NUCL LYON, F-69622 VILLEURBANNE, FRANCE. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA. CHINESE UNIV SCI & TECHNOL, ANHUI 230029, PEOPLES R CHINA. KOREA ADV INST SCI & TECNOL, CTR HIGH ENERGY PHYS, TAEJON 305701, SOUTH KOREA. OAK RIDGE NATL LAB, OAK RIDGE, TN 37831 USA. UNIV SANTIAGO, DEPT FIS PARTICULAS ELEMENTALES, E-15706 SANTIAGO, SPAIN. PAUL SCHERRER INST, CH-5232 VILLIGEN, SWITZERLAND. SHANGHAI INST CERAM, SHANGHAI, PEOPLES R CHINA. DESY, INST HOCHENERGIEPHYS, O-1615 ZEUTHEN, GERMANY. UNIV LAUSANNE, CH-1015 LAUSANNE, SWITZERLAND. CALTECH, PASADENA, CA 91125 USA. HARVARD UNIV, CAMBRIDGE, MA 02139 USA. UNIV CYPRUS, DEPT NAT SCI, NICOSIA, CYPRUS. UNIV HAMBURG, W-2000 HAMBURG 13, GERMANY. RP ADRIANI, O (reprint author), INFN, FLORENCE, ITALY. RI Tsaregorodtsev, Andrei/E-3873-2016; van der Zwaan, Bob/F-4070-2015; D'Alessandro, Raffaello/F-5897-2015; Chmeissani, Mokhtar/G-4346-2015; Duran, Ignacio/H-7254-2015; rodriguez calonge, francisco javier/H-9682-2015; Rancoita, Pier Giorgio/J-9896-2015; Hoorani, Hafeez/D-1791-2013; Arce, Pedro/L-1268-2014; Fiandrini, Emanuele/C-4549-2008; Leijtens, Xaveer/F-3302-2010; Lista, Luca/C-5719-2008; Ludovici, Lucio/F-5917-2011; Servoli, Leonello/E-6766-2012; bertucci, bruna/J-5237-2012; Cerrada, Marcos/J-6934-2014; Gonzalez Romero, Enrique/L-7561-2014; Vogel, Helmut/N-8882-2014; Ferguson, Thomas/O-3444-2014; Berdugo, Javier/A-2858-2015 OI Tsaregorodtsev, Andrei/0000-0003-4618-520X; Diemoz, Marcella/0000-0002-3810-8530; Bertucci, Bruna/0000-0001-7584-293X; van der Zwaan, Bob/0000-0001-5871-7643; D'Alessandro, Raffaello/0000-0001-7997-0306; Chmeissani, Mokhtar/0000-0002-2287-4791; Rancoita, Pier Giorgio/0000-0002-1990-4283; Arce, Pedro/0000-0003-3009-0484; Longo, Egidio/0000-0001-6238-6787; Ambrosi, Giovanni/0000-0001-6977-9559; Leijtens, Xaveer/0000-0001-7794-8236; Ludovici, Lucio/0000-0003-1970-9960; Servoli, Leonello/0000-0003-1725-9185; Cerrada, Marcos/0000-0003-0112-1691; Gonzalez Romero, Enrique/0000-0003-2376-8920; Vogel, Helmut/0000-0002-6109-3023; Ferguson, Thomas/0000-0001-5822-3731; Berdugo, Javier/0000-0002-7911-8532 NR 32 TC 17 Z9 17 U1 3 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-2693 EI 1873-2445 J9 PHYS LETT B JI Phys. 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BILLOIR, P BJARNE, J BLOCH, D BLYTH, S BOCCI, V BOGOLUBOV, PN BOLOGNESE, T BONESINI, M BONIVENTO, W BOOTH, PSL BORISOV, G BORNER, H BOSIO, C BOSTJANCIC, B BOSWORTH, S BOTNER, O BOUDINOV, E BOUQUET, B BOURDARIOS, C BOWCOCK, TJV BOZZO, M BRAIBANT, S BRANCHINI, P BRAND, KD BRENNER, RA BRIAND, H BRICMAN, C BROWN, RCA BRUMMER, N BRUNET, JM BUGGE, L BURAN, T BURMEISTER, H BUYTAERT, JAMA CACCIA, M CALVI, M ROZAS, AJC CAMPION, R CAMPORESI, T CANALE, V CAO, F CARENA, F CARROLL, L CASO, C GIMENEZ, MVC CATTAI, A CAVALLO, FR CERRITO, L CHABAUD, V CHAN, A CHARPENTIER, P CHAUSSARD, L CHAUVEAU, J CHECCHIA, P CHELKOV, GA CHEVALIER, L CHLIAPNIKOV, P CHOROWICZ, V CHRIN, JTM CLARA, MP COLLINS, P CONTRERAS, JL CONTRI, R CORTINA, E COSME, G COUCHOT, F CRAWLEY, HB CRENNELL, D CROSETTI, G CROZON, M MAESTRO, JC CZELLAR, S DAHLJENSEN, E DALMAGNE, B DAM, M DAMGAARD, G DARBO, G DAUBIE, E DAUM, A DAUNCEY, PD DAVENPORT, M DAVID, P DAVIES, J DASILVA, W DEFOIX, C DELIKARIS, D DELORME, S DELPIERRE, P DEMARIA, N DEANGELIS, A DEBOECK, H DEBOER, W DECLERCQ, C LASO, MDMD DEGROOT, N DELAVAISSIERE, C DELOTTO, B DEMIN, A DIJKSTRA, H DICIACCIO, L DJAMA, F DOLBEAU, J DONSZELMANN, M DOROBA, K DRACOS, M DREES, J DRIS, M DUFOUR, Y DUPONT, F EEK, LO EEROLA, PAM EHRET, R EKELOF, T EKSPONG, G PEISERT, AE ENGEL, JP ERSHAIDAT, N FASSOULIOTIS, D FEINDT, M ALONSO, MF FERRER, A FILIPPAS, TA FIRESTONE, A FOETH, H FOKITIS, E FONTANELLI, F FORBES, KAJ FOUSSET, JL FRANCON, S FRANEK, B FRENKIEL, P FRIES, DC FRODESEN, AG FRUHWIRTH, R FULDAQUENZER, F FURNIVAL, K FURSTENAU, H FUSTER, J GAMBA, D GARCIA, C GARCIA, J GASPAR, C GASPARINI, U GAVILLET, P GAZIS, EN GERBER, JP GIACOMELLI, P GOKIELI, R GOLOB, B GOLOVATYUK, VM CADENAS, JJGY GOOBAR, A GOPAL, G GORSKI, M GRACCO, V GRANT, A GRARD, F GRAZIANI, E GROSDIDIER, G GROSS, E GROSSEWIESMANN, P GROSSETETE, B GUMENYUK, S GUY, J HAEDINGER, U HAHN, F HAHN, M HAIDER, S HAKANSSON, A HALLGREN, A HAMACHER, K DEMONCHENAULT, GH HAO, W HARRIS, FJ HENKES, T HERNANDEZ, JJ HERQUET, P HERR, H HESSING, TL HIETANEN, I HIGGINS, CO HIGON, E HILKE, HJ HODGSON, SD HOFMOKL, T HOLMES, R HOLMGREN, SO HOLTHUIZEN, D HONORE, PF HOOPER, JE HOULDEN, M HRUBEC, J HUET, K HULTH, PO HULTQVIST, K IOANNOU, P ISENHOWER, D IVERSEN, PS JACKSON, JN JALOCHA, P JARLSKOG, G JARRY, P JEANMARIE, B JOHANSSON, EK JOHNSON, D JONKER, M JONSSON, L JUILLOT, P KALKANIS, G KALMUS, G KAPUSTA, F KARLSSON, M KARVELAS, E KATSANEVAS, S KATSOUFIS, EC KERANEN, R KESTEMAN, J KHOMENKO, BA KHOVANSKI, NN KING, B KJAER, NJ KLEIN, H KLEMPT, W KLOVNING, A KLUIT, P KOCHMEHRIN, A KOEHNE, JH KOENE, B KOKKINIAS, P KOPF, M KORYTOV, AV KOSTIOUKHINE, V KOURKOUMELIS, C KOUZNETSOV, O KRAMER, PH KROLIKOWSKI, J KRONKVIST, I KRUENERMARQUIS, U KRUPINSKI, W KULKA, K KURVINEN, K LACASTA, C LAMBROPOULOS, C LAMSA, JW LANCERI, L LAPIN, V LAUGIER, JP LAUHAKANGAS, R LEDER, G LEDROIT, F LEITNER, R LEMOIGNE, Y LEMONNE, J LENZEN, G LEPELTIER, V LESIAK, T LEVY, JM LIEB, E LIKO, D LINDGREN, J LINDNER, R LIPNIACKA, A LIPPI, I LOERSTAD, B LOKAJICEK, M LOKEN, JG LOPEZFERNANDEZ, A AGUERA, MAL LOS, M LOUKAS, D LOZANO, JJ LUTZ, P LYONS, L MAEHLUM, G MAILLARD, J MALTEZOS, A MANDL, F MARCO, J MARGONI, M MARIN, JC MARKOU, A MARON, T MARTI, S MATHIS, L MATORRAS, F MATTEUZZI, C MATTHIAE, G MAZZUCATO, M MCCUBBIN, M MCKAY, R MCNULTY, R MEOLA, G MERONI, C MEYER, WT MICHELOTTO, M MIKULEC, I MIRABITO, L MITAROFF, WA MITSELMAKHER, GV MJOERNMARK, U MOA, T MOELLER, R MOENIG, K MONGE, MR MORETTINI, P MUELLER, H MURRAY, WJ MURYN, B MYATT, G NAVARRIA, FL NEGRI, P NIELSEN, BS NIJJHAR, B NIKOLAENKO, V NILSEN, PES NISS, P OBRAZTSOV, V OLSHEVSKI, AG ORAVA, R OSTANKOV, A OSTERBERG, K OURAOU, A PAGANONI, M PAIN, R PALKA, H PAPADOPOULOU, TD PAPE, L PASSERI, A PEGORARO, M PENNANEN, J PEREVOZCHIKOV, V PERNEGGER, H PERNICKA, M PERROTTA, A PETRIDOU, C PETROLINI, A PETROVYKH, L PETTERSEN, TE PIERRE, F PIMENTA, M PINGOT, O PLASZCZYNSKI, S POL, ME POLOK, G POROPAT, P PRIVITERA, P PULLIA, A RADOJICIC, D RAGAZZI, S RAHMANI, H RATOFF, PN READ, AL REDAELLI, NG REGLER, M REID, D RENTON, PB RESVANIS, LK RICHARD, F RICHARDSON, M RIDKY, J RINAUDO, G RODITI, I ROMERO, A RONCAGLIOLO, I RONCHESE, P RONNQVIST, C ROSENBERG, EI ROSSI, S ROSSI, U ROSSO, E ROUDEAU, P ROVELLI, T RUCKSTUHL, W RUHLMANNKLEIDER, V RUIZ, A RYBICKI, K SAARIKKO, H SACQUIN, Y SAJOT, G SALT, J SANCHEZ, J SANNINO, M SCHAEL, S SCHNEIDER, H SCHULZE, B SCHYNS, MAE SCIOLLA, G SCURI, F SEGAR, AM SEKULIN, R SESSA, M SETTE, G SEUFERT, R SHELLARD, RC SICCAMA, I SIEGRIST, P SIMONETTI, S SIMONETTO, F SISAKIAN, AN SKJEVLING, G SMADJA, G SMITH, GR SOSNOWSKI, R SOUZASANTOS, D SPASSOFF, TS SPIRITI, E SQUARCIA, S STAECK, H STANESCU, C STAPNES, S STAVROPOULOS, G STICHELBAUT, F STOCCHI, A STRAUSS, J STRAVER, J STRUB, R STUGU, B SZCZEKOWSKI, M SZEPTYCKA, M SZYMANSKI, P TABARELLI, T TCHIKILEV, O THEODOSIOU, GE TILQUIN, A TIMMERMANS, J TIMOFEEV, VG TKATCHEV, LG TODOROV, T TOET, DZ TOKER, O TORASSA, E TORTORA, L TREILLE, D TREVISAN, U TRISCHUK, W TRISTRAM, G TRONCON, C TSIROU, A TSYGANOV, EN TURALA, M TURLUER, ML TUUVA, T TYAPKIN, IA TYNDEL, M TZAMARIAS, S UEBERSCHAER, S ULLALAND, O UVAROV, V VALENTI, G VALLAZZA, E FERRER, JAV VANDERVELDE, C VANAPELDOORN, GW VANDAM, P VANDERHEIJDEN, M VANDONINCK, WK VAZ, P VEGNI, G VENTURA, L VENUS, W VERBEURE, F VERTOGRADOV, LS VILANOVA, D VINCENT, P VITALE, L VLASOV, E VODOPYANOV, AS VOLLMER, M VOULGARIS, G VOUTILAINEN, M VRBA, V WAHLEN, H WALCK, C WALDNER, F WAYNE, M WEHR, A WEIERSTALL, M WEILHAMMER, P WERNER, J WETHERELL, AM WICKENS, JH WILKINSON, GR WILLIAMS, WSC WINTER, M WITEK, M WORMSER, G WOSCHNAGG, K YAMDAGNI, N YEPES, P ZAITSEV, A ZALEWSKA, A ZALEWSKI, P ZAVRTANIK, D ZEVGOLATAKOS, E ZHANG, G ZIMIN, NI ZITO, M ZUBERI, R FUNCHAL, RZ ZUMERLE, G ZUNIGA, J TI A STUDY OF B(0)-(B)OVER-BAR(0) MIXING USING SEMILEPTONIC DECAYS OF B-HADRONS PRODUCED FROM Z(0) SO PHYSICS LETTERS B LA English DT Article ID LUND MONTE-CARLO; JET FRAGMENTATION; E+E-PHYSICS; COLLIDER AB The B0-B0BAR mixing was studied by using about '50000 hadronic decays of the Z0, collected with the DELPHI detector at LEP. With 1665 dilepton events, the probability for a b quark to become a bBAR before decaying was found to be chi = 0.121(-0.040)+0.044 +/- 0.017. The semileptonic branching ratio of the b was measured from the dilepton and single lepton events and found to be Br(b --> l) = (10.0 +/- 0.7 +/- 0.7)%. C1 CERN,CH-1211 GENEVA 23,SWITZERLAND. RUTHERFORD APPLETON LAB,DIDCOT OX11 0QX,OXON,ENGLAND. NIKHEF H,1009 DB AMSTERDAM,NETHERLANDS. CENS,DAPNIA,DSM,F-91191 GIF SUR YVETTE,FRANCE. JOINT INST NUCL RES,DUBNA,RUSSIA. UNIV HELSINKI,HIGH ENERGY PHYS RES INST,SF-00170 HELSINKI 17,FINLAND. IFIC,E-46100 VALENCIA,SPAIN. UNIV VALENCIA,CSIC,E-46100 VALENCIA,SPAIN. UNIV VALENCIA,DFAMN,E-46100 VALENCIA,SPAIN. UNIV LUND,DEPT PHYS,S-22363 LUND,SWEDEN. UNIV BERGEN,DEPT PHYS,N-5007 BERGEN,NORWAY. UNIV ATHENS,PHYS LAB,GR-10680 ATHENS,GREECE. UNIV MILAN,DEPT FIS,I-20133 MILAN,ITALY. INFN,I-20133 MILAN,ITALY. UNIV LYON 1,IPNL,IN2P3,CNRS,F-69622 VILLEURBANNE,FRANCE. UNIV KARLSRUHE,INST EXPTL KERNPHYS,W-7500 KARLSRUHE 1,GERMANY. UNIV STOCKHOLM,INST PHYS,S-11346 STOCKHOLM,SWEDEN. UNIV PARIS 11,ACCELERATEUR LINEAIRE LAB,IN2P3,CNRS,F-91405 ORSAY,FRANCE. UNIV GRENOBLE 1,INST SCI NUCL,F-38026 GRENOBLE,FRANCE. UNIV TRIESTE,DIPARTIMENTO FIS,I-34127 TRIESTE,ITALY. INFN,I-34127 TRIESTE,ITALY. UNIV UDINE,IST FIS,I-33100 UDINE,ITALY. UNIV OXFORD,NUCL PHYS LAB,OXFORD OX1 3RH,ENGLAND. IST SUPER SANITA,INFN,I-00161 ROME,ITALY. UNIV COMPLUTENSE,E-28040 MADRID,SPAIN. AUSTRIAN ACAD SCI,INST HOCHENERGIE PHYS,A-1050 VIENNA,AUSTRIA. UNIV PARIS 06,LPNHE,F-75252 PARIS 05,FRANCE. UNIV PARIS 07,F-75252 PARIS 05,FRANCE. UNIV GESAMTHSCH WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. PONTIFICIA UNIV CATOLICA,DEPT FIS,BR-22453 RIO JANEIRO,BRAZIL. COLL FRANCE,PHYS CORPUSCULAIRE LAB,IN2P3,CNRS,F-75231 PARIS 05,FRANCE. PROTVINO HIGH ENERGY PHYS INST,142284 PROTVINO,RUSSIA. NCSR DEMOKRITOS,INST NUCL PHYS,GR-15310 ATHENS,GREECE. ULP,CTR RECH NUCL,IN2P3,CNRS,F-67037 STRASBOURG,FRANCE. UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. INFN,I-40126 BOLOGNA,ITALY. UNIV INSTELLING ANTWERP,DEPT PHYS,B-2610 WILRIJK,BELGIUM. ULB,VUB,IIHE,B-1050 BRUSSELS,BELGIUM. UNIV ETAT MONS,FAC SCI,B-7000 MONS,BELGIUM. UNIV TURIN,DIPARTIMENTO FIS SPERIMENTALE,I-10125 TURIN,ITALY. INFN,I-10125 TURIN,ITALY. UNIV ROME 2,DIPARTIMENTO FIS,I-00173 ROME,ITALY. UNIV LIVERPOOL,DEPT PHYS,LIVERPOOL L69 3BX,ENGLAND. UNIV LJUBLJANA,J STEFAN INST,YU-61000 LJUBLJANA,SLOVENIA. UNIV LJUBLJANA,DEPT PHYS,YU-61000 LJUBLJANA,SLOVENIA. UNIV UPPSALA,DEPT RADIAT SCI,S-75121 UPPSALA,SWEDEN. UNIV GENOA,DIPARTIMENTO FIS,I-16146 GENOA,ITALY. INFN,I-16146 GENOA,ITALY. UNIV PADUA,DIPARTIMENTO FIS,I-35131 PADUA,ITALY. INFN,I-35131 PADUA,ITALY. UNIV OSLO,DEPT PHYS,N-1000 OSLO 3,NORWAY. UNIV SANTANDER,FAC CIENCIAS,E-39005 SANTANDER,SPAIN. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. NIELS BOHR INST,DK-2100 COPENHAGEN 0,DENMARK. UNIV WARSAW,PL-00681 WARSAW,POLAND. INST NUCL STUDIES,PL-00681 WARSAW,POLAND. NATL TECH UNIV ATHENS,DEPT PHYS,GR-15773 ATHENS,GREECE. UNIV AIX MARSEILLE 2,CPP,IN2P3,CNRS,F-13288 MARSEILLE 09,FRANCE. INST NUCL PHYS,HIGH ENERGY PHYS LAB,PL-30055 KRAKOW 30,POLAND. CHARLES UNIV,MFF,CTR NUCL,NC,CS-18600 PRAGUE 8,CZECHOSLOVAKIA. UNIV LANCASTER,SCH PHYS & MAT,LANCASTER LA1 4YB,ENGLAND. FZU,INST PHYS CAS,DIV HIGH ENERGY PHYS,CS-18040 PRAGUE 8,CZECHOSLOVAKIA. CTR BRASILEIRO PESQUISAS FIS,BR-22290 RIO JANEIRO,BRAZIL. RP ABREU, P (reprint author), FOUL,LIP,IST,AV ELIAS GARCIA 14 L0,P-1000 LISBON,PORTUGAL. RI Andreazza, Attilio/E-5642-2011; de Groot, Nicolo/A-2675-2009; Dracos, Marcos/K-2335-2012; Katsanevas, Stavros/A-4297-2011; Ruiz, Alberto/E-4473-2011; branchini, paolo/A-4857-2011; Shellard, Ronald/G-4825-2012; Schulze, Bruno/B-7599-2008; Petrolini, Alessandro/H-3782-2011; Torassa, Ezio/I-1788-2012; Giacomelli, Paolo/B-8076-2009; Fruhwirth, Rudolf/H-2529-2012; Hallgren, Allan/A-8963-2013; Barao, Fernando/O-2357-2016; Barrio, Juan/L-3227-2014; Zaitsev, Alexandre/B-8989-2017; Zuniga, Juan/P-4385-2014; Michelotto, Michele/A-9571-2013; Matorras, Francisco/I-4983-2015; Ferrer, Antonio/H-2942-2015; Rovelli, Tiziano/K-4432-2015; Fernandez-Alonso, Mercedes/F-2557-2016; Lozano-Bahilo, Julio/F-4881-2016; Olshevskiy, Alexander/I-1580-2016; Paganoni, Marco/A-4235-2016; Contreras Gonzalez, Jose Luis/K-7255-2014; Hernandez-Rey, Juan Jose/N-5955-2014; Abreu, Pedro/L-2220-2014; Botner, Olga/A-9110-2013; Zalewski, Piotr/H-7335-2013; Marti-Garcia, Salvador/F-3085-2011; Vaz, Pedro/K-2464-2013; Monge, Maria Roberta/G-9127-2012; Ridky, Jan/H-6184-2014; Zukanovich Funchal, Renata/C-5829-2013; Fernandez, Ester/K-9734-2014; Pimenta, Mario/M-1741-2013; Gomez Cadenas, Juan Jose/L-2003-2014; Ragazzi, Stefano/D-2463-2009; Roditi, Itzhak/O-7448-2014 OI Andreazza, Attilio/0000-0001-5161-5759; Dracos, Marcos/0000-0003-0514-193X; Ruiz, Alberto/0000-0002-3639-0368; Shellard, Ronald/0000-0002-2983-1815; Schulze, Bruno/0000-0002-3325-5785; Petrolini, Alessandro/0000-0003-0222-7594; Barao, Fernando/0000-0002-8346-9941; Barrio, Juan/0000-0002-0965-0259; Zaitsev, Alexandre/0000-0002-4961-8368; Zuniga, Juan/0000-0002-1041-6451; Michelotto, Michele/0000-0001-6644-987X; Matorras, Francisco/0000-0003-4295-5668; Ferrer, Antonio/0000-0003-0532-711X; Rovelli, Tiziano/0000-0002-9746-4842; Fernandez-Alonso, Mercedes/0000-0002-1311-5275; Lozano-Bahilo, Julio/0000-0003-0613-140X; Olshevskiy, Alexander/0000-0002-8902-1793; Paganoni, Marco/0000-0003-2461-275X; Contreras Gonzalez, Jose Luis/0000-0001-7282-2394; Hernandez-Rey, Juan Jose/0000-0002-1527-7200; Abreu, Pedro/0000-0002-9973-7314; Vaz, Pedro/0000-0002-7186-2359; Monge, Maria Roberta/0000-0003-1633-3195; Ridky, Jan/0000-0001-6697-1393; Zukanovich Funchal, Renata/0000-0001-6749-0022; Pimenta, Mario/0000-0002-2590-0908; Gomez Cadenas, Juan Jose/0000-0002-8224-7714; Ragazzi, Stefano/0000-0001-8219-2074; Roditi, Itzhak/0000-0003-2363-5626 NR 19 TC 17 Z9 17 U1 0 U2 8 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 FEB 25 PY 1993 VL 301 IS 1 BP 145 EP 154 DI 10.1016/0370-2693(93)90736-2 PG 10 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KM924 UT WOS:A1993KM92400027 ER PT J AU BLANK, ML FITZGERALD, V LEE, TC SNYDER, F AF BLANK, ML FITZGERALD, V LEE, TC SNYDER, F TI EVIDENCE FOR BIOSYNTHESIS OF PLASMENYLCHOLINE FROM PLASMENYLETHANOLAMINE IN HL-60 CELLS SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Note DE PLASMALOGEN BIOSYNTHESIS; PLASMENYLCHOLINE; PLASMENYLETHANOLAMINE ID PLATELET-ACTIVATING FACTOR; PHOSPHOLIPASE-A2; DIFFERENTIATION; IDENTIFICATION; METABOLISM; MYOCARDIUM; LIPIDS AB Both [H-3]plasmenylethanolamine and [H-3]plasmenylcholine were produced from substrates of [H-3]alk-1-enylglycerol and [H-3]alk-1-enyllysoglycerophosphoethanolamine by intact HL-60 cells. Molecular species analysis of the [H-3]plasmenylcholine and [H-3]plasmenylethanolamine formed indicated the major portion of plasmenylcholine originates from plasmenylethanolamine by a series of reactions catalyzed by phospholipase A2, lysophospholipase D, acyltransferase, phosphohydrolase, and cholinephosphotransferase. However, a significant but much smaller portion of the plasmenylcholine appeared to be synthesized from plasmenylethanolamine via a direct base-exchange or a coupled phospholipase C/cholinephosphotransferase reaction. C1 OAK RIDGE INST SCI & EDUC,DIV MED SCI,POB 117,OAK RIDGE,TN 37831. FU NHLBI NIH HHS [HL27109-11A1, HL35495-05A1] NR 18 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD FEB 24 PY 1993 VL 1166 IS 2-3 BP 309 EP 312 DI 10.1016/0005-2760(93)90112-M PG 4 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA KN699 UT WOS:A1993KN69900024 PM 8382961 ER PT J AU APPELMAN, EH JACHE, AW AF APPELMAN, EH JACHE, AW TI TRIFLUOROMETHANESULFONYL HYPOFLUORITE, A HITHERTO UNKNOWN FLUOROXY COMPOUND SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ACETYL HYPOFLUORITE AB Trifluoromethanesulfonyl hypofluorite (CF3SO2OF) has been synthesized by the reaction of fluorosulfuryl hypofluorite (FSO2OF) with cesium trifluoromethanesulfonate. It is the first compound in which a sulfur atom is bonded both to carbon and to an O-F moiety. The compound has a melting point of -87 +/- 2-degrees-C and an extrapolated boiling point of 0 +/- 1-degrees-C. The F-19 NMR spectrum of the compound in CFCl3 at -80-degrees-C shows a CF3 doublet at -71 ppm and a broad OF singlet at +238 ppm. From the latter can be deduced an O-F bond energy of about 145 kJ/mol, comparable to that of FSO2OF. The compound hydrolyses in base to give a mixture of O2 and CF4, along with (presumably) sulfate and trifluoromethanesulfonate. It decomposes thermally in the presence of CsF to yield principally CF3SO2F and OF2 along with (presumably) cesium trifluoromethanesulfonate. RP APPELMAN, EH (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. NR 15 TC 5 Z9 5 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD FEB 24 PY 1993 VL 115 IS 4 BP 1376 EP 1378 DI 10.1021/ja00057a021 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA KN534 UT WOS:A1993KN53400021 ER PT J AU APPELMAN, EH FRENCH, D MISHANI, E ROZEN, S AF APPELMAN, EH FRENCH, D MISHANI, E ROZEN, S TI SYNTHESIS, CHARACTERIZATION, AND REACTION CHEMISTRY OF TERT-BUTYL HYPOFLUORITE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ACETYL HYPOFLUORITE; ELECTROPHILIC FLUORINATION; ELEMENTAL FLUORINE; ORGANIC-COMPOUNDS; FLUOROXY COMPOUNDS; ACID; HYDROXYLATION; CH3OF; BOND AB tert-Butyl hypofluorite ((CH3)3COF) can be synthesized by the low-temperature reaction of elemental fluorine with tert-butyl alcohol dissolved in propionitrile or acetonitrile. The isolated compound, which melts around -94-degrees-C and has an extrapolated boiling point of about +40-degrees-C, has been characterized by mass, NMR, and IR spectrometry. The F-19 NMR shift of +67 ppm lies between the corresponding shifts of HOF and CH3OF and implies a rather high O-F bond energy. Although sterically crowded, tert-butyl hypofluorite adds to olefins to form beta-fluoro-tert-butoxy compounds. Addition is mainly in an anti mode, and the regioselectivity corresponds to the action of a hitherto unknown tert-butoxylium electrophile. Also formed are adducts containing F and CH2CN, the latter deriving from the acetonitrile solvent. C1 TEL AVIV UNIV,RAYMOND & BEVERLY SACKLER FAC EXACT SCI,SCH CHEM,IL-69978 TEL AVIV,ISRAEL. RP APPELMAN, EH (reprint author), ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439, USA. RI Rozen, Shlomo/C-7619-2016 NR 24 TC 10 Z9 10 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD FEB 24 PY 1993 VL 115 IS 4 BP 1379 EP 1382 DI 10.1021/ja00057a022 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA KN534 UT WOS:A1993KN53400022 ER PT J AU PETRICH, SA PANG, Y YOUNG, VG BARTON, TJ AF PETRICH, SA PANG, Y YOUNG, VG BARTON, TJ TI SYNTHESIS AND STRUCTURE OF AN OCTASILA[4.4]BETWEENALLENE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. NR 10 TC 12 Z9 12 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD FEB 24 PY 1993 VL 115 IS 4 BP 1591 EP 1593 DI 10.1021/ja00057a063 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA KN534 UT WOS:A1993KN53400062 ER PT J AU SUTHERLAND, BM RANDESI, M WANG, K CONLON, K EPLING, GA AF SUTHERLAND, BM RANDESI, M WANG, K CONLON, K EPLING, GA TI PROMOTER-SPECIFIC SYNTHETIC PHOTOENDONUCLEASE - ROSE BENGAL-LABELED T7 RNA-POLYMERASE SO BIOCHEMISTRY LA English DT Article ID SINGLE-STRAND BREAKS; SEQUENCE-SPECIFIC CLEAVAGE; DNA-BINDING PROTEIN; GEL-ELECTROPHORESIS; DUPLEX DNA; QUANTITATION; FLUORESCENCE; RECOGNITION; CONVERSION; NUCLEASE AB We have constructed a synthetic photoendonuclease composed of T7 RNA polymerase linked to rose bengal. The promoter-specific polymerase confers site-specific binding, and the photosensitizer rose bengal allows light-induced DNA cleavage. Using a gentle labeling procedure, we find that the polymerase can be labeled with 1-30 rose bengals. Polymerase labeled to about 8 rose bengals per molecule retains the same efficiency and specificity of binding to promoter-containing DNA as unlabeled polymerase. At this level of rose bengal substitution, the synthetic endonuclease, in the presence of visible light, specifically cleaves linear or supercoiled DNA containing a T7 promoter. It induces frank single-strand breaks, rather than labile sites convertible to breaks upon additional treatments. Neither the free rose bengal moiety not bonded to polymerase nor the free (not bound to DNA) rose bengal-substituted polymerase cleaves DNA. Although rose bengal is an efficient generator of singlet oxygen, depletion of oxygen from reaction mixtures increases the cleavage rate. This indicates that singlet oxygen cleavage is not a major mechanism of DNA nicking by the synthetic endonuclease. At higher levels of rose bengal substitution, the labeled polymerase shows decreased binding efficiency and increased nonspecific binding to DNA without a T7 promoter; the specificity of DNA cleavage also decreases. These results indicate that the site specificity of rose bengal photocleavage by the synthetic endonuclease results from specific binding of the polymerase, and thus rose bengal photonicking reflects polymerase binding. C1 UNIV CONNECTICUT,DEPT CHEM,STORRS,CT 06269. RP SUTHERLAND, BM (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. NR 32 TC 4 Z9 4 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 23 PY 1993 VL 32 IS 7 BP 1788 EP 1794 DI 10.1021/bi00058a012 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KN668 UT WOS:A1993KN66800012 PM 8439539 ER PT J AU CALLAHAN, DE TSO, POP LESKO, SA AF CALLAHAN, DE TSO, POP LESKO, SA TI EVIDENCE FOR A SPECIFIC 3D ORGANIZATION OF INTERPHASE CHROMOSOMES IN HUMAN-LYMPHOCYTES SO FASEB JOURNAL LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. JOHNS HOPKINS SHPH,DEPT BIOCHEM,BALTIMORE,MD 21205. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 23 PY 1993 VL 7 IS 4 BP A720 EP A720 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KP975 UT WOS:A1993KP97501155 ER PT J AU CAO, H HAZLEWOOD, CF RORSCHACH, HE SHAPIRO, S THURSTON, T AF CAO, H HAZLEWOOD, CF RORSCHACH, HE SHAPIRO, S THURSTON, T TI PROTEIN DYNAMICS IN CRYSTALS AND IN SOLUTION USING THE QUASI-ELASTIC NEUTRON-SCATTERING TECHNIQUES SO FASEB JOURNAL LA English DT Meeting Abstract C1 RICE UNIV,HOUSTON,TX 77251. BROOKHAVEN NATL LAB,UPTON,NY 11973. BAYLOR COLL MED,HOUSTON,TX 77030. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 23 PY 1993 VL 7 IS 4 BP A813 EP A813 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KP975 UT WOS:A1993KP97501691 ER PT J AU FORTE, TM GOTHGOLDSTEIN, R MCCALL, MR AF FORTE, TM GOTHGOLDSTEIN, R MCCALL, MR TI EXTRACELLULAR ASSEMBLY OF NASCENT HDL CONTAINING APO-AI OR APO-AII - A REVERSE CHOLESTEROL TRANSPORT MECHANISM SO FASEB JOURNAL LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 23 PY 1993 VL 7 IS 4 BP A797 EP A797 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KP975 UT WOS:A1993KP97501596 ER PT J AU HAUSER, MR NIYOGI, SK COOK, JS AF HAUSER, MR NIYOGI, SK COOK, JS TI DIFFERENTIAL RESPONSES OF NA+/H+ EXCHANGE AND MITOGENESIS IN MOUSE KERATINOCYTE CELLS (MK) TO LOW CONCENTRATIONS OF EGF AND EGF VARIANTS SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37830. OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 23 PY 1993 VL 7 IS 4 BP A811 EP A811 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KP975 UT WOS:A1993KP97501678 ER PT J AU LIBURDY, RP HARLAND, JD CALLAHAN, DE AF LIBURDY, RP HARLAND, JD CALLAHAN, DE TI EFFECTS OF 60 HZ ELECTRIC AND MAGNETIC-FIELDS ON CONA BINDING AND CALCIUM SIGNAL TRANSDUCTION IN RAT THYMOCYTES SO FASEB JOURNAL LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DIV LIFE SCI,BIOELECTROMAGNET RES FACIL,BERKELEY,CA 94720. NR 0 TC 2 Z9 2 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 23 PY 1993 VL 7 IS 4 BP A805 EP A805 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KP975 UT WOS:A1993KP97501645 ER PT J AU GSCHNEIDNER, KA AF GSCHNEIDNER, KA TI SYSTEMATICS AND ANOMALIES SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF : RARE EARTHS 92 CY JUN 01-05, 1992 CL KYOTO, JAPAN SP CHEM SOC JAPAN, JAPAN INST MET, JAPAN SOC ANAL CHEM, ELECTROCHEM SOC JAPAN, CERAM SOC JAPAN, SOC SYNTHET ORGANIC CHEM JAPAN, JAPAN SOC NEWER MET, PHYS SOC JAPAN, JAPAN SOC APPL PHYS, KINKI CHEM SOC ID SOLID-SOLUTION; HYDROGEN; ALLOYS; CALORIMETRY; ENTHALPIES; METALS AB Systematics is a powerful tool and anomalies thereof are extremely helpful in our comprehension of the behaviors of the rare earth elements and in particular, the lanthanides. It is shown that a greater knowledge of the lanthanide elements is obtained if information is available on the corresponding Sc and Y compounds, and these are also included in the systematic evaluation of the property, than if the lanthanide data are used by themselves. Initially, the behaviors of the pure elements are examined, and then in turn systematics is applied to solid solution alloys (especially H in R), the melting behavior and heats (free energies) of formation of rare earth compounds, and finally aqueous solutions (stability constants of complexes). All of these data indicate that 4f hybridization with the valence electrons (5d, 6s) of the lanthanide and the non-rare earth element in an alloy or compound occurs. The most striking evidence for 4f bonding is seen in the H dissolved in R solid solution alloys. A new method for predicting heats (free energies) of formation of the lanthanide element compounds from the known values of the corresponding Sc, Y and La compounds has been developed. The estimated values are believed to be correct within +/-20%. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MAT SCI & ENGN,AMES,IA 50011. RP GSCHNEIDNER, KA (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011, USA. NR 45 TC 24 Z9 24 U1 0 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD FEB 23 PY 1993 VL 192 IS 1-2 BP 1 EP 10 DI 10.1016/0925-8388(93)90170-R PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA KV115 UT WOS:A1993KV11500002 ER PT J AU KOZACK, R MADLAND, DG AF KOZACK, R MADLAND, DG TI PARAMETER CORRELATIONS AND AMBIGUITIES IN DIRAC PHENOMENOLOGY SO NUCLEAR PHYSICS A LA English DT Article ID ELASTIC-SCATTERING; OPTICAL POTENTIALS; IMAGINARY POTENTIALS; INELASTIC-SCATTERING; PREDICTION; MODEL AB We quantitatively study correlations and ambiguities in Dirac phenomenology for a particular case, elastic p+Ca-40 scattering at 181 MeV. In terms of chi-square, two equivalent families of potentials are found, only one of which predicts the correct total reaction cross section. The imaginary strengths are poorly determined but are linearly correlated with each other. The extent of ambiguities and correlations in the other parameters is studied. C1 LOS ALAMOS NATL LAB,DIV THEORET,T-2,MS B243,LOS ALAMOS,NM 87545. NR 18 TC 0 Z9 0 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 FEB 22 PY 1993 VL 552 IS 4 BP 469 EP 478 DI 10.1016/0375-9474(93)90279-7 PG 10 WC Physics, Nuclear SC Physics GA KT493 UT WOS:A1993KT49300003 ER PT J AU SCHERER, S KOCH, JH FRIAR, JL AF SCHERER, S KOCH, JH FRIAR, JL TI SYSTEMATICS OF LOW-ENERGY THEOREMS FOR PION-PHOTOPRODUCTION AND ELECTROPRODUCTION SO NUCLEAR PHYSICS A LA English DT Article ID P(GAMMA,PI-0) CROSS-SECTION; CHIRAL-SYMMETRY-BREAKING; PHYSICAL PIONS; THRESHOLD; PROTON AB We examine the role of kinematical variables and analyticity in the derivation of low-energy theorems for pion photo- and electroproduction. Other expansion schemes are compared to the low-energy theorem. We illustrate this with a recent calculation of these processes in chiral perturbation theory. The possibility to test the low-energy theorem experimentally is discussed. C1 NATL INST NUCL & HIGH ENERGY PHYS,SECT K,POB 41882,1009 DB AMSTERDAM,NETHERLANDS. UNIV AMSTERDAM,INST THEORET PHYS,AMSTERDAM,NETHERLANDS. LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV MAINZ,INST KERNPHYS,W-6500 MAINZ,GERMANY. NR 25 TC 10 Z9 10 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 FEB 22 PY 1993 VL 552 IS 4 BP 515 EP 522 DI 10.1016/0375-9474(93)90282-3 PG 8 WC Physics, Nuclear SC Physics GA KT493 UT WOS:A1993KT49300006 ER PT J AU HEWETT, JL AF HEWETT, JL TI CAN THE DECAY-B-]S-GAMMA CLOSE THE SUPERSYMMETRIC HIGGS BOSON PRODUCTION WINDOW SO PHYSICAL REVIEW LETTERS LA English DT Article ID BBAR-MESON DECAY; RARE B-DECAYS; QCD ENHANCEMENT; B->S-GAMMA; MODEL; MASS AB We show that the present limit from the CLEO Collaboration on the inclusive decay b --> sgamma provides strong constraints on the parameters of the charged Higgs boson sector in two-Higgs-doublet models. Only a slight improvement in the experimental bound will exclude the region in the supersymmetric Higgs boson parameter space which is inaccessible to collider searches. C1 UNIV OREGON,INST THEORET SCI,EUGENE,OR 97403. RP HEWETT, JL (reprint author), ARGONNE NATL LAB,DIV HIGH ENERGY PHYS,ARGONNE,IL 60439, USA. NR 33 TC 146 Z9 146 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 FEB 22 PY 1993 VL 70 IS 8 BP 1045 EP 1048 DI 10.1103/PhysRevLett.70.1045 PG 4 WC Physics, Multidisciplinary SC Physics GA KM779 UT WOS:A1993KM77900004 ER PT J AU ARISAKA, K AUERBACH, LB AXELROD, S BELZ, J BIERY, KA BUCHHOLZ, P CHAPMAN, MD COUSINS, RD DIWAN, MV ECKHAUSE, M GINKEL, JF GUSS, C HANCOCK, AD HEINSON, AP HIGHLAND, VL HOFFMANN, GW HORVATH, J IRWIN, GM JOYCE, D KAARSBERG, T KANE, JR KENNEY, CJ KETTELL, SH KINNISON, WW KNIBBE, P KONIGSBERG, J KUANG, Y LANG, K LEE, DM MARGULIES, J MATHIAZHAGAN, C MCFARLANE, WK MCKEE, RJ MELESE, P MILNER, EC MOLZON, WR OUIMETTE, DA RILEY, PJ RITCHIE, JL RUBIN, P SANDERS, GH SCHWARTZ, AJ SIVERTZ, M SLATER, WE URHEIM, J VULCAN, WF WAGNER, DL WELSH, RE WHYLEY, RJ WINTER, RG WITKOWSKI, MT WOJCICKI, SG YAMASHITA, A ZIOCK, HJ AF ARISAKA, K AUERBACH, LB AXELROD, S BELZ, J BIERY, KA BUCHHOLZ, P CHAPMAN, MD COUSINS, RD DIWAN, MV ECKHAUSE, M GINKEL, JF GUSS, C HANCOCK, AD HEINSON, AP HIGHLAND, VL HOFFMANN, GW HORVATH, J IRWIN, GM JOYCE, D KAARSBERG, T KANE, JR KENNEY, CJ KETTELL, SH KINNISON, WW KNIBBE, P KONIGSBERG, J KUANG, Y LANG, K LEE, DM MARGULIES, J MATHIAZHAGAN, C MCFARLANE, WK MCKEE, RJ MELESE, P MILNER, EC MOLZON, WR OUIMETTE, DA RILEY, PJ RITCHIE, JL RUBIN, P SANDERS, GH SCHWARTZ, AJ SIVERTZ, M SLATER, WE URHEIM, J VULCAN, WF WAGNER, DL WELSH, RE WHYLEY, RJ WINTER, RG WITKOWSKI, MT WOJCICKI, SG YAMASHITA, A ZIOCK, HJ TI IMPROVED UPPER LIMIT ON THE BRANCHING RATIO B(KL(0)-]MU+/-E+/-) SO PHYSICAL REVIEW LETTERS LA English DT Article ID DECAY KL0->MU-MU; SEARCH; MASSES AB A search for the decay K(L)0 --> mu+/-e-/+ with significantly increased experimental sensitivity has yielded no events. The 90% confidence level limit on the branching ratio is B(K(L)0 --> mu+/-e-/+F) < 3.9 x 10(-11). When this data set is combined with earlier data the upper limit is 3.3 x 10(-11). C1 TEMPLE UNIV,PHILADELPHIA,PA 19122. STANFORD UNIV,STANFORD,CA 94309. COLL WILLIAM & MARY,WILLIAMSBURG,VA 23187. UNIV CALIF IRVINE,IRVINE,CA 92717. UNIV TEXAS,AUSTIN,TX 78712. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP ARISAKA, K (reprint author), UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024, USA. NR 21 TC 45 Z9 45 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 22 PY 1993 VL 70 IS 8 BP 1049 EP 1052 DI 10.1103/PhysRevLett.70.1049 PG 4 WC Physics, Multidisciplinary SC Physics GA KM779 UT WOS:A1993KM77900005 ER PT J AU AKIBA, Y BEAVIS, D BEERY, P BRITT, HC BUDICK, B CHASMAN, C CHEN, Z CHI, CY CHU, YY CIANCIOLO, V COLE, BA COSTALES, JB CRAWFORD, HJ CUMMING, JB DEBBE, R ENGELAGE, J FUNG, SY GONIN, M GUSHUE, S HAMAGAKI, H HANSEN, O HAYANO, RS HAYASHI, S HOMMA, S KANEKO, H KANG, J KAUFMAN, S KEHOE, WL KURITA, K LEDOUX, RJ LEVINE, MJ MIAKE, Y MORRISON, DP MORSE, RJ MOSKOWITZ, B NAGAMIYA, S NAMBOODIRI, MN NAYAK, TK OLNESS, J PARSONS, CG REMSBERG, LP ROEHRICH, D ROTHSCHILD, P SAKURAI, H SANGSTER, TC SETO, R SOLTZ, R STANKUS, P STEADMAN, SG STEPHANS, GSF SUNG, T TANAKA, Y TANNENBAUM, MJ THOMAS, J TONSE, S VANDIJK, JH VIDEBAEK, F VOSSNACK, O VUTSADAKIS, V WANG, FQ WANG, Y WEGNER, HE WOODRUFF, DS WU, YD YANG, X ZACHARY, D ZAJC, WA AF AKIBA, Y BEAVIS, D BEERY, P BRITT, HC BUDICK, B CHASMAN, C CHEN, Z CHI, CY CHU, YY CIANCIOLO, V COLE, BA COSTALES, JB CRAWFORD, HJ CUMMING, JB DEBBE, R ENGELAGE, J FUNG, SY GONIN, M GUSHUE, S HAMAGAKI, H HANSEN, O HAYANO, RS HAYASHI, S HOMMA, S KANEKO, H KANG, J KAUFMAN, S KEHOE, WL KURITA, K LEDOUX, RJ LEVINE, MJ MIAKE, Y MORRISON, DP MORSE, RJ MOSKOWITZ, B NAGAMIYA, S NAMBOODIRI, MN NAYAK, TK OLNESS, J PARSONS, CG REMSBERG, LP ROEHRICH, D ROTHSCHILD, P SAKURAI, H SANGSTER, TC SETO, R SOLTZ, R STANKUS, P STEADMAN, SG STEPHANS, GSF SUNG, T TANAKA, Y TANNENBAUM, MJ THOMAS, J TONSE, S VANDIJK, JH VIDEBAEK, F VOSSNACK, O VUTSADAKIS, V WANG, FQ WANG, Y WEGNER, HE WOODRUFF, DS WU, YD YANG, X ZACHARY, D ZAJC, WA TI BOSE-EINSTEIN CORRELATION OF KAONS IN SI + AU COLLISIONS AT 14.6A GEV/C SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUARK-GLUON PLASMA; COLLISIONS; INTERFEROMETRY; HADRON AB The E-802 spectrometer at the Brookhaven Alternating Gradient Synchrotron, enhanced by a trigger for selection of events with one or more specified particles, has been used to measure the momentum-space correlation between pairs of K+'s emitted in central Si+Au collisions at 14.6A GeV/c. This correlation has been projected onto the Lorentz-invariant relative four-momentum axis. Fits to this correlation function yield a size for the kaon source that is comparable to that found using pi+ pairs from a similar rapidity range, once a transformation from the particle-pair frames to a single source frame is made. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. BROOKHAVEN NATL LAB,UPTON,NY 11973. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. COLUMBIA UNIV,NEW YORK,NY 10027. UNIV CALIF RIVERSIDE,RIVERSIDE,CA 92507. NEVIS LABS,IRVINGTON,NY 10533. KYOTO UNIV,SAKYO KU,KYOTO 606,JAPAN. KYUSHU UNIV,FUKUOKA 812,JAPAN. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. MIT,CAMBRIDGE,MA 02139. NYU,NEW YORK,NY 10003. UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN. UNIV TSUKUBA,TSUKUBA,IBARAKI 305,JAPAN. RP AKIBA, Y (reprint author), UNIV TOKYO,INST NUCL STUDY,TANASHI,TOKYO 188,JAPAN. RI seto, richard/G-8467-2011; Cumming, James/I-3358-2013; SAKURAI, HIROYOSHI/G-5085-2014; Hayano, Ryugo/F-7889-2012; HAMAGAKI, HIDEKI/G-4899-2014; OI Cumming, James/0000-0001-6930-0958; Hayano, Ryugo/0000-0002-1214-7806; cianciolo, thomas vincent/0000-0002-9441-3222 NR 21 TC 42 Z9 43 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 FEB 22 PY 1993 VL 70 IS 8 BP 1057 EP 1060 DI 10.1103/PhysRevLett.70.1057 PG 4 WC Physics, Multidisciplinary SC Physics GA KM779 UT WOS:A1993KM77900007 ER PT J AU JANZEN, VP ANDREWS, HR HAAS, B RADFORD, DC WARD, D OMAR, A PREVOST, D SAWICKI, M UNRAU, P WADDINGTON, JC DRAKE, TE GALINDOURIBARRI, A WYSS, R AF JANZEN, VP ANDREWS, HR HAAS, B RADFORD, DC WARD, D OMAR, A PREVOST, D SAWICKI, M UNRAU, P WADDINGTON, JC DRAKE, TE GALINDOURIBARRI, A WYSS, R TI THE PROTON-H11/2 INTRUDER ORBITAL - EVIDENCE FOR COLLECTIVITY AND A STRONG PROTON-NEUTRON INTERACTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID MASS REGION; BANDS; NUCLEI; SN-110 AB A rotational band based on the proton h11/2 orbital has been observed to high spin (79/2 HBAR) and high rotational frequency (HBARomega congruent-to 1.0 MeV) in the nucleus Sb-113(51). The measured transition quadrupole moment is Q0 = 4.4 +/- 0.6 e b, consistent with an axial prolate deformation of beta2 congruent-to 0.32. A large interaction strength (360 +/- 60 keV) has been measured for the rotational alignment of h11/2 neutrons which, together with a considerable delay in the crossing frequency (DELTAHBARomega congruent-to 0.09 MeV), is construed as the first direct evidence of a large high-j proton-neutron interaction. C1 MCMASTER UNIV,HAMILTON L8S 4M1,ONTARIO,CANADA. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. OAK RIDGE NATL LAB,JOINT INST HEAVY ION RES,OAK RIDGE,TN 37831. RP JANZEN, VP (reprint author), AECL RES,CHALK RIVER LABS,CHALK RIVER K0J 1J0,ONTARIO,CANADA. RI radford, David/A-3928-2015 NR 14 TC 79 Z9 79 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 FEB 22 PY 1993 VL 70 IS 8 BP 1065 EP 1068 DI 10.1103/PhysRevLett.70.1065 PG 4 WC Physics, Multidisciplinary SC Physics GA KM779 UT WOS:A1993KM77900009 ER PT J AU SCHUCH, R SCHNEIDER, D KNAPP, DA DEWITT, D MCDONALD, J CHEN, MH CLARK, MW MARRS, RE AF SCHUCH, R SCHNEIDER, D KNAPP, DA DEWITT, D MCDONALD, J CHEN, MH CLARK, MW MARRS, RE TI EVIDENCE FOR INTERNAL DIELECTRONIC EXCITATION OF SLOW HIGHLY CHARGED URANIUM IONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ELECTRON-EMISSION; AR IONS; SURFACE AB We have measured x-ray emission from the neutralization of slow U(q+) ions with charge states q = 61 - 73 and energies of 7q keV on a Be foil. We were able to resolve M-satellite groups and found an expected increase in M x-ray intensity with increasing number of M-shell vacancies in the incident ions. However, for charge states with no M-shell vacancies, we also observed a significant intensity of M x rays. We take this observation as evidence of an internal dielectronic excitation process occurring during the neutralization of the ions. C1 LAWRENCE LIVERMORE NATL LAB, DEPT PHYS, LIVERMORE, CA 94550 USA. RP SCHUCH, R (reprint author), MANNE SIEGBAHN INST PHYS, S-10405 STOCKHOLM, SWEDEN. NR 23 TC 39 Z9 41 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 22 PY 1993 VL 70 IS 8 BP 1073 EP 1076 DI 10.1103/PhysRevLett.70.1073 PG 4 WC Physics, Multidisciplinary SC Physics GA KM779 UT WOS:A1993KM77900011 ER PT J AU DAEMEN, LL BULAEVSKII, LN MALEY, MP COULTER, JY AF DAEMEN, LL BULAEVSKII, LN MALEY, MP COULTER, JY TI CRITICAL CURRENT OF JOSEPHSON-COUPLED SYSTEMS IN PERPENDICULAR FIELDS SO PHYSICAL REVIEW LETTERS LA English DT Article ID VORTEX STATE; LAYERED SUPERCONDUCTORS; MAGNETIC-FIELDS; LATTICE; FILMS AB We calculate the magnetic field and temperature dependence of the critical current density j(c) along the c axis in Josephson-coupled layered systems when the applied magnetic field is parallel to the c axis. j(c) decreases with field and temperature because of the thermal fluctuations of the vortices which induce a phase difference across the junctions. The anisotropy ratio gamma is-proportional-to 1/square-root j(c) acquires a field and temperature dependence. The decoupling phase transition line above which the superconducting current along the c axis vanishes is determined. C1 LOS ALAMOS NATL LAB,CTR SUPERCOND TECHNOL,LOS ALAMOS,NM 87545. RP DAEMEN, LL (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 18 TC 163 Z9 163 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 FEB 22 PY 1993 VL 70 IS 8 BP 1167 EP 1170 DI 10.1103/PhysRevLett.70.1167 PG 4 WC Physics, Multidisciplinary SC Physics GA KM779 UT WOS:A1993KM77900035 ER PT J AU JOYCE, JJ ARKO, AJ AF JOYCE, JJ ARKO, AJ TI CRUCIAL BUT OVERLOOKED ASPECTS OF PHOTOEMISSION IN SMALL T-KAPPA CERIUM MATERIALS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter ID CESI2 RP JOYCE, JJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 12 TC 26 Z9 26 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 22 PY 1993 VL 70 IS 8 BP 1181 EP 1182 DI 10.1103/PhysRevLett.70.1181 PG 2 WC Physics, Multidisciplinary SC Physics GA KM779 UT WOS:A1993KM77900040 ER PT J AU ERCK, R AF ERCK, R TI THERMODYNAMIC DEFINITION SO SCIENTIST LA English DT Letter RP ERCK, R (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD FEB 22 PY 1993 VL 7 IS 4 BP 10 EP 10 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA KM689 UT WOS:A1993KM68900010 ER PT J AU WU, M HALL, G SEARS, TJ AF WU, M HALL, G SEARS, TJ TI LASER-INDUCED FLUORESCENCE SPECTROSCOPY OF THE JET-COOLED HNCN RADICAL SO JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS LA English DT Article ID 193 NM PHOTOLYSIS; SPECTRUM; NH2; AMMONIA; STATE AB The observation of laser-induced fluorescence spectra of the jet-cooled HNCN free radical is reported. The HNCN free radical was generated by ArF laser photolysis of a mixture of NH3, C2N, and N2 in the ratio 1 : 1 : 10 in the first stages of a supersonic free jet expansion. Evidence suggests that the mechanism of formation of HNCN under these conditions is CN + NH2 --> HNCN + H. The lifetime of the excited 2A' state is found to be 20 +/- 5 ns. Molecular constants were obtained by a least-squares fit of the present and previously published data to an effective rotational Hamiltonian. Approximate vibrational intervals in the ground state of the radical were measured for the first time by dispersing the laser-induced fluorescence. The dispersed fluorescence spectra show activity in a bending vibration, assigned from its parallel rotational structure to the delta(HN-C-N) a'' mode. This is interpreted as evidence for a Renner-Teller effect in the radical. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RI Sears, Trevor/B-5990-2013 OI Sears, Trevor/0000-0002-5559-0154 NR 23 TC 17 Z9 17 U1 0 U2 1 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 FEB 21 PY 1993 VL 89 IS 4 BP 615 EP 622 DI 10.1039/ft9938900615 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KP421 UT WOS:A1993KP42100002 ER PT J AU LYKKE, KR WURZ, P PARKER, DH PELLIN, MJ AF LYKKE, KR WURZ, P PARKER, DH PELLIN, MJ TI MOLECULAR ANALYSIS BY IONIZATION OF LASER-DESORBED NEUTRAL SPECIES SO APPLIED OPTICS LA English DT Article DE MOLECULAR SURFACE ANALYSIS; MASS SPECTROMETRY; LASER DESORPTION ID SINGLE-PHOTON IONIZATION; MASS-SPECTROMETRY; MULTIPHOTON IONIZATION; ORGANIC POLYMERS; INFRARED-SPECTROSCOPY; CARBON; C-60; SURFACE; BUCKMINSTERFULLERENE; PHOTOABLATION AB A powerful molecular surface analysis technique for the analysis of complex materials, such as polymer/additive systems, consists of laser desorption of surface molecules and subsequent ionization of these gas-phase molecules with resonant or nonresonant laser ionization. These molecular ions are subsequently detected by Fourier-transform mass spectrometry or time-of-flight mass spectrometry. We show that different wavelengths for the postionization step permit selectivity that provides important additional information on the chemical makeup of these complex materials. Near-UV wavelengths selectively ionize aromatic polymer additives, far-UV wavelengths photoionize other nonaromatic species; and vacuum-UV wavelengths provide access to all the desorbed species. In addition to these applied results, we study many fundamental issues of laser desorption, such as desorption thresholds, velocity distributions, postionization wavelength selectivity, etc. The Fourier-transform mass spectrometer and time-of-flight mass spectrometer are discussed in detail. C1 ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. RP LYKKE, KR (reprint author), ARGONNE NATL LAB, DIV MAT SCI, ARGONNE, IL 60439 USA. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 46 TC 29 Z9 29 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD FEB 20 PY 1993 VL 32 IS 6 BP 857 EP 866 PG 10 WC Optics SC Optics GA KM929 UT WOS:A1993KM92900009 PM 20802761 ER PT J AU MATHEWS, GJ SCHRAMM, DN AF MATHEWS, GJ SCHRAMM, DN TI PROTOGALACTIC MERGERS AND COSMOCHRONOLOGY SO ASTROPHYSICAL JOURNAL LA English DT Article DE DARK MATTER; GALAXIES, EVOLUTION; GALAXIES, INTERACTIONS; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES ID COLD DARK MATTER; DISSIPATIONAL GALAXY FORMATION; GALACTIC CHEMICAL EVOLUTION; AGE-METALLICITY RELATION; GLOBULAR-CLUSTER SYSTEM; ELLIPTICAL GALAXIES; LUMINOSITY FUNCTION; SOLAR NEIGHBORHOOD; FAINT GALAXIES; STAR FORMATION AB We construct schematic models for chemical evolution and cosmochronology within the expanding and collapsing protogalactic halo followed by formation of the local disk. Star formation is associated with both the rate of protogalactic mergers and the intrinsic gas density of protogalactic clouds and the disk. This leads naturally to a scenario in which star formation in the disk can be delayed by several billion years relative to the formation of the oldest globular clusters. We analyze various cosmochronometers in the context of this model and show that the apparent differences between the maximum globular-cluster ages, the white-dwarf cooling age, and nuclear chronometric ages can be understood. The merger models which satisfy the age constraints imply a relatively late forming peak in luminosity and therefore may be consistent with the observed peak in galaxy number counts at intermediate redshifts Versions of the model with and without nonbaryonic dark matters can yield significant dark baryonic halos. C1 UNIV CHICAGO,CHICAGO,IL 60637. RP MATHEWS, GJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 86 TC 29 Z9 29 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 FEB 20 PY 1993 VL 404 IS 2 BP 468 EP 475 DI 10.1086/172301 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KL879 UT WOS:A1993KL87900008 ER PT J AU MATHEWS, GJ SCHRAMM, DN MEYER, BS AF MATHEWS, GJ SCHRAMM, DN MEYER, BS TI LIMITS TO THE PRIMORDIAL HELIUM ABUNDANCE IN THE BARYON-INHOMOGENEOUS BIG-BANG SO ASTROPHYSICAL JOURNAL LA English DT Article DE EARLY UNIVERSE; ELEMENTARY PARTICLES; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES ID HADRON PHASE-TRANSITION; NEUTRON DIFFUSION; EARLY UNIVERSE; NUMBER FLUCTUATIONS; HEAVY-ELEMENTS; NUCLEOSYNTHESIS; LITHIUM; MODELS; BE-9; HE-3 AB The parameter space for baryon inhomogeneous big bang models is explored with the goal of determining the minimum helium abundance obtainable in such models while still satisfying the other light-element constraints. We find that the constraint of (D + He-3)/H < 10(-4) restricts the primordial helium mass fraction from baryon-inhomogeneous big bang models to be greater-than-or-equal-to 0.231 even for a scenario which optimizes the effects of the inhomogeneities and destroys the excess lithium production. Thus, this modification to the standard big bang as well as the standard homogeneous big bang model itself would be falsifiable by observation if the primordial He-4 abundance were observed to be less than 0.231. Furthermore, a present upper limit to the observed helium mass fraction of Y(p)obs less-than-or-equal-to 0.24 implies that the maximum baryon-to-photon ratio allowable in the inhomogeneous models corresponds to eta less-than-or-equal-to 2.3 x 10(-9) (OMEGA(b)h2 less-than-or-equal-to 0.088) even if all conditions are optimized. C1 UNIV CHICAGO,CHICAGO,IL 60637. CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. RP MATHEWS, GJ (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 37 TC 25 Z9 25 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 FEB 20 PY 1993 VL 404 IS 2 BP 476 EP 479 DI 10.1086/172302 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KL879 UT WOS:A1993KL87900009 ER PT J AU LAGUNA, P MILLER, WA ZUREK, WH AF LAGUNA, P MILLER, WA ZUREK, WH TI SMOOTHED PARTICLE HYDRODYNAMICS NEAR A BLACK-HOLE SO ASTROPHYSICAL JOURNAL LA English DT Article DE BLACK HOLE PHYSICS; HYDRODYNAMICS; METHODS, NUMERICAL; RELATIVITY ID ANGULAR-MOMENTUM; ACCRETION; STARS; SPH AB We derive the smoothed particle hydrodynamic equations for a relativistic fluid in a static curved spacetime geometry. We apply this technique to develop a three-dimensional numerical code for the study of fluid flows around black holes. We present here three one-dimensional benchmarks used in the calibration of our code: (1) relativistic shock tubes, (2) dust infall onto a black hole, and (3) Bondi collapse. Moreover, we describe briefly the use of this computational tool to analyze the tidal disruption of stars by supermassive black holes. C1 PENN STATE UNIV,DEPT ASTRON & ASTROPHYS,UNIV PK,PA 16802. PHILLIPS LAB,KIRTLAND AFB,NM 87117. RP LAGUNA, P (reprint author), LOS ALAMOS NATL LAB,THEORET ASTROPHYS GRP,T-6,B288,LOS ALAMOS,NM 87545, USA. NR 28 TC 35 Z9 35 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD FEB 20 PY 1993 VL 404 IS 2 BP 678 EP 685 DI 10.1086/172321 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KL879 UT WOS:A1993KL87900028 ER PT J AU SANYAL, MK SINHA, SK GIBAUD, A HUANG, KG CARVALHO, BL RAFAILOVICH, M SOKOLOV, J ZHAO, X ZHAO, W AF SANYAL, MK SINHA, SK GIBAUD, A HUANG, KG CARVALHO, BL RAFAILOVICH, M SOKOLOV, J ZHAO, X ZHAO, W TI FOURIER RECONSTRUCTION OF DENSITY PROFILES OF THIN-FILMS USING ANOMALOUS X-RAY REFLECTIVITY SO EUROPHYSICS LETTERS LA English DT Article DE SOLID-SOLID INTERFACES (INC BICRYSTALS); THIN FILM GROWTH, STRUCTURE, AND EPITAXY; LAYER STRUCTURES, INTERCALATION COMPOUNDS AND SUPERLATTICES, GROWTH, STRUCTURE; AND NONELECTRONIC PROPERTIES ID LANGMUIR-BLODGETT MULTILAYERS; DIFFRACTION; SURFACES AB The use of X-ray and neutron reflectivity measurements to determine the density profile across and interface or across thin films has become increasingly popular over the last few years. However, in general convenient model-independent methods of inverting the reflectivity profiles to obtain the density profile have been missing. We present here one such approach using the method of anomalous reflectivity from the substrate and demonstrate its applicability in the case of an organic thin film. C1 MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139. CUNY QUEENS COLL,DEPT PHYS,FLUSHING,NY 11367. EXXON RES & ENGN CO,CORP RES LABS,ANNANDALE,NJ 08801. RP SANYAL, MK (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI sanyal, milan/J-2527-2015 OI sanyal, milan/0000-0002-3847-8793 NR 17 TC 67 Z9 68 U1 0 U2 3 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD FEB 20 PY 1993 VL 21 IS 6 BP 691 EP 696 DI 10.1209/0295-5075/21/6/010 PG 6 WC Physics, Multidisciplinary SC Physics GA KP294 UT WOS:A1993KP29400010 ER PT J AU PINNICK, RG FERNANDEZ, G MARTINEZANDAZOLA, E HINDS, BD HANSEN, ADA FULLER, K AF PINNICK, RG FERNANDEZ, G MARTINEZANDAZOLA, E HINDS, BD HANSEN, ADA FULLER, K TI AEROSOL IN THE ARID SOUTHWESTERN UNITED-STATES - MEASUREMENTS OF MASS LOADING, VOLATILITY, SIZE DISTRIBUTION, ABSORPTION CHARACTERISTICS, BLACK CARBON CONTENT, AND VERTICAL STRUCTURE TO 7 KM ABOVE SEA-LEVEL SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID CLASSICAL ELECTROMAGNETIC SCATTERING; COMPLEX REFRACTIVE-INDEX; REAL-TIME MEASUREMENT; RESPONSE CHARACTERISTICS; ABSORBING COMPONENT; CONSUMMATE SOLUTION; PARTICULATE CARBON; ELEMENTAL CARBON; LIGHT-ABSORPTION; SOIL PARTICLES AB Near-surface and lower tropospheric aerosol characteristics have been determined at several remote sites near Orogrande, New Mexico, using a variety of methods and sensors including quartz fiber filter samplers, hi-vol samplers, ground-based and aircraft-mounted light-scattering aerosol counters, an aerosol counter equipped with a heated inlet, and an aethalometer (a device that measures aerosol absorption). The results of these measurements, which have been taken sporadically over the last 15 years but with a higher density of measurements during 1989-1991, suggest that regardless of season, aerosol consists of two modes: a submicron fraction composed primarily of ammonium/acid sulfates and elemental black carbon (BC) and a supermicron fraction composed mainly of quartz and clay minerals of soil origin. Aerosol mass concentrations determined from weekly or biweekly samples are dominated by wind-derived aerosol of soil origin and typically range from almost-equal-to 10 mug m-3 in the fall rainy season (August-October) to almost-equal-to 100 mug m-3 during the spring windy season (February-June). The mass concentration frequency of occurrence of both total aerosol and BC are well approximated lognormal probability distributions. Geometric mean masses of aerosol range from 16 to 32 mug m and are smaller for mountain sites than for basin sites; geometric mean BC mass concentrations at a single basin site are almost-equal-to 0.15 mug m-3. Aerosol loadings decrease slightly from 1975-1977 to 1990 measurement periods, whereas BC concentrations, within statistical error, remain unchanged. However, a statistically significant increase in BC did occur from 1990 to 1991. The fraction of (visible spectrum) aerosol absorption attributable to BC has a yearly mean value of almost-equal-to 0.84, although during dusty conditions occurring in spring or early summer, non-BC aerosol absorption contributes up to almost-equal-to 30% of the total. Sulfate and BC aerosol concentrations are sometimes highly correlated, suggesting they have a common source and may be internally mixed. Limited aircraft measurements in the lowest few kilometers of the troposphere reveal a well-mixed aerosol for a neutral atmospheric condition, and a significant decrease in aerosol concentration with altitude for a stable atmospheric condition. C1 NEW MEXICO STATE UNIV,PHYS SCI LAB,LAS CRUCES,NM 88003. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. COLORADO STATE UNIV,DEPT ATMOSPHER SCI,FT COLLINS,CO 80523. RP PINNICK, RG (reprint author), ATMOSPHER SCI LAB,WHITE SANDS MISSILE RANGE,NM 88002, USA. NR 51 TC 41 Z9 42 U1 0 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD FEB 20 PY 1993 VL 98 IS D2 BP 2651 EP 2666 DI 10.1029/92JD02211 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KN689 UT WOS:A1993KN68900006 ER PT J AU LEE, JH LEAHY, DF TANG, IN NEWMAN, L AF LEE, JH LEAHY, DF TANG, IN NEWMAN, L TI MEASUREMENT AND SPECIATION OF GAS-PHASE PEROXIDES IN THE ATMOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID HYDROGEN-PEROXIDE; CHEMISTRY; CLOUD; H2O2; AIR; HYDROPEROXIDES; FORMALDEHYDE; SYSTEM; TREES AB An improved gas phase sampler and a recently developed nonenzymatic measurement method for H2O2 and HOCH2OOH(HMHP) are described. The gas phase sampler is equipped with a surfaceless intake to alleviate heterogeneous loss of H2O2 in the sampling line. The nonenzymatic method makes use of the aqueous phase Fention reaction for H2O2 measurement and is capable of speciation between H2O2 and HMHP, using a dual channel technique. By adding a third channel employing the well-established method of p-hydroxyphenylacetic acid (POHPAA) and horseradish peroxidase for total peroxide measurement, it is possible to differentiate H2O2, HMHP, and other organic peroxides, if present. The measurement technique was successfully deployed in a field study at George L. Smith III State Park, Georgia (82-degrees-20'W, 32-degrees-30'N). Preliminary data analysis indicates that the measured total peroxides range from 0.4 to approximately 6 ppbv, depending on meteorological conditions, and that organic peroxides, mostly HMHP, constitute between 20 and 80% of the total peroxides. The work reported here represents the first continuous and real-time measurements for these peroxides in the atmosphere. RP LEE, JH (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENVIRONM CHEM,UPTON,NY 11973, USA. NR 28 TC 63 Z9 65 U1 1 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD FEB 20 PY 1993 VL 98 IS D2 BP 2911 EP 2915 DI 10.1029/92JD02514 PG 5 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KN689 UT WOS:A1993KN68900024 ER PT J AU TRAINER, M PARRISH, DD BUHR, MP NORTON, RB FEHSENFELD, FC ANLAUF, KG BOTTENHEIM, JW TANG, YZ WIEBE, HA ROBERTS, JM TANNER, RL NEWMAN, L BOWERSOX, VC MEAGHER, JF OLSZYNA, KJ RODGERS, MO WANG, T BERRESHEIM, H DEMERJIAN, KL ROYCHOWDHURY, UK AF TRAINER, M PARRISH, DD BUHR, MP NORTON, RB FEHSENFELD, FC ANLAUF, KG BOTTENHEIM, JW TANG, YZ WIEBE, HA ROBERTS, JM TANNER, RL NEWMAN, L BOWERSOX, VC MEAGHER, JF OLSZYNA, KJ RODGERS, MO WANG, T BERRESHEIM, H DEMERJIAN, KL ROYCHOWDHURY, UK TI CORRELATION OF OZONE WITH NOY IN PHOTOCHEMICALLY AGED AIR SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID EASTERN-UNITED-STATES; TROPOSPHERIC OZONE; NIWOT RIDGE; ORGANIC NITRATES; RURAL OZONE; NITROGEN; COLORADO; TRANSPORT; BUDGET; SMOG AB During the summer of 1988, measurements of photochemical trace species were made at a coordinated network of seven rural sites in the eastern United States and Canada. At six of these sites concurrent measurements of ozone and the sum of the reactive nitrogen species, NO(y), were made, and at four of the sites a measure for the reaction products of the NO(x) oxidation was obtained. Common to all sites, ozone, in photochemically aged air during the summer, shows an increase with increasing NO(y) levels, from a background value of 30-40 parts per billion by volume (ppbv) at NO(y) mixing ratios below 1 ppbv to values between 70 to 100 ppbv at NO(y) levels of 10 ppbv. Ozone correlates even more closely with the products of the NO(x) oxidation. The correlations from the different sites agree closely at mixing ratios of the oxidation products below 5 ppbv, but systematic differences appear at higher levels. Variations in the biogenic hydrocarbon emissions may explain these differences. C1 UNIV COLORADO,NOAA,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309. ATMOSPHER ENVIRONM SERV,TORONTO,ON,CANADA. BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENVIRONM CHEM,UPTON,NY 11973. ILLINOIS STATE WATER SURVEY,ATMOSPHER CHEM SECT,CHAMPAIGN,IL 61820. TENNESSEE VALLEY AUTHOR,DEPT ATMOSPHER SCI,MUSCLE SHOALS,AL 35661. GEORGIA INST TECHNOL,SCH GEOPHYS SCI,ATLANTA,GA 30332. ATMOSPHER SCI RES CTR,WILMINGTON,NY 12205. RP TRAINER, M (reprint author), NOAA,AERON LAB,BOULDER,CO 80303, USA. RI Roberts, James/A-1082-2009; Parrish, David/E-8957-2010; Berresheim, Harald/F-9670-2011; Trainer, Michael/H-5168-2013; Fehsenfeld, Frederick/I-4876-2013; WANG, Tao/B-9919-2014 OI Roberts, James/0000-0002-8485-8172; Parrish, David/0000-0001-6312-2724; WANG, Tao/0000-0002-4765-9377 NR 37 TC 264 Z9 267 U1 4 U2 29 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD FEB 20 PY 1993 VL 98 IS D2 BP 2917 EP 2925 DI 10.1029/92JD01910 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KN689 UT WOS:A1993KN68900025 ER PT J AU PARRISH, DD BUHR, MP TRAINER, M NORTON, RB SHIMSHOCK, JP FEHSENFELD, FC ANLAUF, KG BOTTENHEIM, JW TANG, YZ WIEBE, HA ROBERTS, JM TANNER, RL NEWMAN, L BOWERSOX, VC OLSZYNA, KJ BAILEY, EM RODGERS, MO WANG, T BERRESHEIM, H ROYCHOWDHURY, UK DEMERJIAN, KL AF PARRISH, DD BUHR, MP TRAINER, M NORTON, RB SHIMSHOCK, JP FEHSENFELD, FC ANLAUF, KG BOTTENHEIM, JW TANG, YZ WIEBE, HA ROBERTS, JM TANNER, RL NEWMAN, L BOWERSOX, VC OLSZYNA, KJ BAILEY, EM RODGERS, MO WANG, T BERRESHEIM, H ROYCHOWDHURY, UK DEMERJIAN, KL TI THE TOTAL REACTIVE OXIDIZED NITROGEN LEVELS AND THE PARTITIONING BETWEEN THE INDIVIDUAL-SPECIES AT 6 RURAL SITES IN EASTERN NORTH-AMERICA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID NOY MEASUREMENT TECHNIQUES; PEROXYACETYL NITRATE PAN; ACID DEPOSITION MODEL; NIWOT-RIDGE; UNITED-STATES; NATURAL HYDROCARBONS; ORGANIC NITRATES; CARBON-MONOXIDE; NITRIC-ACID; COLORADO AB During the late summer and early fall of 1988, measurements of many trace species of tropospheric photochemical interest, including NO, NO2, PAN, HNO3, NO3-, NO(Y), and ozone were made at seven surface stations in the eastern United States and Canada. The NO(Y) (as well as ozone) levels and its partitioning were strongly influenced by the diurnal evolution of the boundary layer at the sites that are beneath the nocturnal inversion. At the higher elevation sites the median levels of all species were much more nearly constant. During the daytime the median NO(Y) levels were 2 to 5 ppbv at all sites, which may be representative of rural areas in the populated regions of eastern North America. Each site showed variations in the NO(Y) levels of an order of magnitude or more. Measurements from all of the sites are consistent with the major contributors to NO(Y) being NO(X) (the sum of NO and NO2), PAN, and nitric acid with a minor contribution from aerosol nitrate. At the lower elevation sites the median [NO(X)] to [NO(Y)] ratios were 70% or more during the night and declined to minima of 25 to 40% during the day. During the daytime the ranges of the median contributions of PAN and HNO3 to NO(Y) were 12 to 25% and approximately 20 to 30%, respectively. The distributions of the contributions about these medians are discussed. Results from all of the sites are consistent with the individually measured species accounting for about 90% of the simultaneously measured NO(Y). C1 UNIV COLORADO,NOAA,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309. PENN STATE UNIV,DEPT METEOROL,UNIV PK,PA 16802. ATMOSPHER ENVIRONM SERV,TORONTO M3H 5T4,ON,CANADA. ILLINOIS STATE WATER SURVEY,ATMOSPHER CHEM SECT,CHAMPAIGN,IL 61820. TENNESSEE VALLEY AUTHOR,MUSCLE SHOALS,AL 35661. GEORGIA INST TECHNOL,SCH EARTH & ATMOSPHER SCI,ATLANTA,GA 30332. SUNY ALBANY,ATMOSPHER SCI RES CTR,WILMINGTON,NY 12205. BROOKHAVEN NATL LAB,DEPT APPL SCI,DIV ENVIRONM CHEM,UPTON,NY 11973. RP PARRISH, DD (reprint author), NOAA,AERON LAB,BOULDER,CO 80303, USA. RI Roberts, James/A-1082-2009; Parrish, David/E-8957-2010; Berresheim, Harald/F-9670-2011; Trainer, Michael/H-5168-2013; Fehsenfeld, Frederick/I-4876-2013; WANG, Tao/B-9919-2014 OI Roberts, James/0000-0002-8485-8172; Parrish, David/0000-0001-6312-2724; WANG, Tao/0000-0002-4765-9377 NR 41 TC 146 Z9 146 U1 3 U2 17 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD FEB 20 PY 1993 VL 98 IS D2 BP 2927 EP 2939 DI 10.1029/92JD02384 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KN689 UT WOS:A1993KN68900026 ER PT J AU BRENDEL, V PERELSON, AS AF BRENDEL, V PERELSON, AS TI QUANTITATIVE MODEL OF COLE1 PLASMID COPY NUMBER CONTROL SO JOURNAL OF MOLECULAR BIOLOGY LA English DT Article DE COLE1; PLASMID COPY NUMBER; RNA-I; RNA-II; ROM (ROP) PROTEIN ID RNA-I; ESCHERICHIA-COLI; PRIMER TRANSCRIPT; DNA-REPLICATION; ROM PROTEIN; MATHEMATICAL-MODEL; RIBONUCLEASE-H; BINDING; INVIVO; INCOMPATIBILITY C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. STANFORD UNIV,DEPT MATH,STANFORD,CA 94305. FU NIGMS NIH HHS [GM39907] NR 49 TC 29 Z9 29 U1 0 U2 10 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 FEB 20 PY 1993 VL 229 IS 4 BP 860 EP 872 DI 10.1006/jmbi.1993.1092 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KP939 UT WOS:A1993KP93900007 PM 7680381 ER PT J AU MELCHIONNA, S CICCOTTI, G HOLIAN, BL AF MELCHIONNA, S CICCOTTI, G HOLIAN, BL TI HOOVER NPT DYNAMICS FOR SYSTEMS VARYING IN SHAPE AND SIZE SO MOLECULAR PHYSICS LA English DT Article ID TEMPERATURE MOLECULAR-DYNAMICS; CANONICAL ENSEMBLE; FREE-ENERGY; SIMULATIONS; EQUILIBRIUM; METALS AB In this paper we write down equations of motion (following the approach pioneered by Hoover) for an exact isothermal-isobaric molecular dynamics simulation, and we extend them to multiple thermostating rates, to a shape-varying cell and to molecular systems, coherently with the previous 'extended system method'. An integration scheme is proposed together with a numerical illustration of the method. C1 UNIV PARIS 11,CTR EUROPEEN CALCUL ATOM & MOLEC,F-91405 ORSAY,FRANCE. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MELCHIONNA, S (reprint author), UNIV ROMA LA SAPIENZA,DIPARTIMENTO FIS,PIAZZALE ALDO MORO 2,I-00185 ROME,ITALY. RI Melchionna, Simone/J-2359-2012 NR 17 TC 649 Z9 653 U1 8 U2 52 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD FEB 20 PY 1993 VL 78 IS 3 BP 533 EP 544 DI 10.1080/00268979300100371 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KQ355 UT WOS:A1993KQ35500002 ER PT J AU GUPTA, SK BERDAHL, P RUSSO, RE BRICENO, G ZETTL, A AF GUPTA, SK BERDAHL, P RUSSO, RE BRICENO, G ZETTL, A TI PULSE IV CHARACTERISTICS MEASUREMENT TO STUDY THE DISSIPATION MECHANISM IN EPITAXIAL YBA2CU3OX THIN-FILMS AT HIGH-CURRENT DENSITIES SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID KOSTERLITZ-THOULESS TRANSITION; HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; BA-CU-O; RESISTIVE TRANSITION; MAGNETIC-FIELD; FLUCTUATIONS; CREEP; STATE AB A simple Pulse method of measuring current-voltage characteristics (I-V) at high current densities is described. We report I-Vs on epitaxial YBa2Cu3Ox thin films at high current densities in the presence of a magnetic field parallel to the c-axis. The results show that the Bardeen-Stephen flux flow model does not account for dissipation at high current densities in YBa2Cu3Ox thin films. In the presence of a magnetic field, we find qualitative agreement with a simple theoretical model based on dissipation caused by 2D vortices excited from the flux lines. In the absence of a magnetic field, a power law behavior arises due to current-induced depairing of thermally excited 2D vortices. C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. BHABHA ATOM RES CTR, DIV TECH PHYS & PROTOTYPE ENGN, BOMBAY 400085, INDIA. RP LAWRENCE BERKELEY LAB, DIV ENERGY & ENVIRONM, BERKELEY, CA 94720 USA. RI Zettl, Alex/O-4925-2016 OI Zettl, Alex/0000-0001-6330-136X NR 28 TC 36 Z9 36 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 EI 1873-2143 J9 PHYSICA C JI Physica C PD FEB 20 PY 1993 VL 206 IS 3-4 BP 335 EP 344 DI 10.1016/0921-4534(93)90533-V PG 10 WC Physics, Applied SC Physics GA KP075 UT WOS:A1993KP07500021 ER PT J AU WANG, WD WU, NJ THIEL, PA TRINGIDES, MC AF WANG, WD WU, NJ THIEL, PA TRINGIDES, MC TI EPITAXIAL-GROWTH IN A STRAINED SYSTEM - NI(100)-O(7X7) SO SURFACE SCIENCE LA English DT Article AB It is known that a (7 x 7) superstructure forms in the temperature range 300 to 400 K, upon oxidation of Ni(100). Quantitative measurement of LEED spot intensities reveals the presence of regularly-spaced antiphase walls within the (7 x 7) unit cell. We suggest that such antiphase walls may serve generally to relieve strain in oxide epitaxies. C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. RP WANG, WD (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 14 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 20 PY 1993 VL 282 IS 3 BP 229 EP 236 DI 10.1016/0039-6028(93)90928-D PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA KM005 UT WOS:A1993KM00500005 ER PT J AU SCHILDBACH, MA HAMZA, AV AF SCHILDBACH, MA HAMZA, AV TI CLEAN AND WATER-COVERED SAPPHIRE (1(1)OVER-BAR-02) SURFACES - STRUCTURE AND LASER-INDUCED DESORPTION SO SURFACE SCIENCE LA English DT Article ID 2ND HARMONIC-GENERATION; KNUDSEN-LAYER FORMATION; ELECTRONIC-STRUCTURE; THERMAL-DESORPTION; ALPHA-ALUMINA; 111 SURFACE; H2O; ADSORPTION; AUGER; AL2O3 AB The atomic and electronic structure of clean and water-covered sapphire (1102BAR) surfaces have been studied by low energy electron diffraction (LEED), electron energy loss spectroscopy (ELS), and temperature programmed desorption (TPD). A surface electronic state with a loss energy of 4.1 eV is measured in the bulk bandgap on the clean, reconstructed (2 x 1) surface. Exposure of the surface to water at room temperature (RT) causes the surface electronic state to shift to lower loss energies reaching a value of approximately 3.6 eV at saturation coverage. In addition a higher energy loss feature appears at approximately 7.5 eV loss and is attributed to a hydroxyl adlayer. Adsorption of water on the surface at RT was observed to proceed with near unity sticking probability. Two desorption states were seen. At low coverage a state appears with a peak temperature for desorption of 525 K. With increasing exposure the peak shifts to lower temperature, reaching 450 K near one monolayer, defined as one water molecule per (1 x 1) unit cell. At higher coverages a second state becomes populated. The water adlayer removed the surface reconstruction only after exposure to an electron beam, yielding a (1 x 1) LEED pattern. The laser-induced desorption of aluminum ions from clean and water-covered sapphire (1102BAR) at laser wavelengths of 1064 nm (1.17 eV), 355 nm (3.51 eV), and 266 nm (4.66 eV) was investigated by time-of-flight mass spectrometry. Below the laser ablation threshold, predominately Al+ ions desorbed with an average kinetic energy of 7.0 +/- 0.7 eV at all three wavelengths from both clean and water-covered surfaces. For 1064 nm light at fluences just below the ablation threshold, AlO- desorbed with kinetic energy of 1.7 +/- 0.5 eV from the clean (2 x 1) surface. The observed aluminum desorption at high kinetic energy is consistent with the previously proposed aluminum-localized exciton-mediated desorption mechanism. In sharp contrast to the laser-surface interactions, a 300 eV electron beam desorbed O+ from the clean (2 x 1) surface and H+ and OH+ from the water-covered surface. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NR 44 TC 37 Z9 37 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 20 PY 1993 VL 282 IS 3 BP 306 EP 322 DI 10.1016/0039-6028(93)90936-E PG 17 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA KM005 UT WOS:A1993KM00500013 ER PT J AU ZHENG, Y SHIRLEY, DA AF ZHENG, Y SHIRLEY, DA TI MULTIPLE-SCATTERING ENHANCED DEPTH SENSITIVITY OF ANGLE-RESOLVED PHOTOEMISSION EXTENDED FINE-STRUCTURE SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SURFACE-STRUCTURE; ADSORBATE-GEOMETRY; DIFFRACTION AB We show by analysis of experimental results that, in the structural study of adsorbed surfaces, the angle-resolved photoemission extended fine structure (ARPEFS) technique has a strong depth sensitivity that can yield unique information about adsorbate-induced substrate near-surface relaxation. Furthermore, we show by theoretical calculations that, in contrast to the generally accepted picture, the enhanced depth sensitivity of ARPEFS arises largely from multiple-scattering effects. RP ZHENG, Y (reprint author), UNIV CALIF,LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94740, USA. NR 19 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD FEB 19 PY 1993 VL 203 IS 2-3 BP 114 EP 118 DI 10.1016/0009-2614(93)85373-V PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KL975 UT WOS:A1993KL97500005 ER PT J AU KOURI, DJ ARNOLD, M HOFFMAN, DK AF KOURI, DJ ARNOLD, M HOFFMAN, DK TI TIME-TO-ENERGY TRANSFORM OF WAVEPACKETS USING ABSORBING POTENTIALS - TIME-INDEPENDENT WAVEPACKET-SCHRODINGER AND WAVEPACKET-LIPPMANN-SCHWINGER EQUATIONS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID MOLECULAR-COLLISIONS; REACTIVE SCATTERING; PROBABILITIES; SYSTEMS; H+H-2 AB It is shown that one may use an L2 basis, matrix representation of the Hamiltonian, including a negative imaginary absorbing potential, to carry out arbitrarily long-time evolution of wavepackets. The time-to-energy Fourier transform of the wavepacket is carried out analytically, yielding a new type of time-independent scattering equation in which the ''source'' of scattered waves is the initial (t = 0) L2 wavepacket used in the time-dependent propagation. Alternatively, one obtains the analogous time-independent, inhomogeneous wavepacket-Schrodinger equation. A banded representation of the Hamiltonian is achieved by the use of distributed approximating function theory to evaluate the kinetic energy. The resulting new time-independent wavepacket equations are solved both by matrix diagonalization of the Hamiltonian, and as inhomogeneous linear algebraic equations. The approach is illustrated by application to electron scattering (in one dimension) by a double barrier potential. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP KOURI, DJ (reprint author), UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204, USA. NR 31 TC 73 Z9 73 U1 0 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 FEB 19 PY 1993 VL 203 IS 2-3 BP 166 EP 174 DI 10.1016/0009-2614(93)85382-X PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KL975 UT WOS:A1993KL97500014 ER PT J AU MCCALL, MR KUYPERS, F VANDENBERG, J KRAUSS, RM KNOFF, L TRIBBLE, DL PUNGLIA, R FORTE, TM AF MCCALL, MR KUYPERS, F VANDENBERG, J KRAUSS, RM KNOFF, L TRIBBLE, DL PUNGLIA, R FORTE, TM TI GAS-PHASE OXIDANTS FROM CIGARETTE-SMOKE DEPLETE PLASMA VITAMIN-E AND IMPAIR LCAT ACTIVITY SO FASEB JOURNAL LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 19 PY 1993 VL 7 IS 3 BP A414 EP A414 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KP974 UT WOS:A1993KP97402392 ER PT J AU PIERSON, RN RUSSELL, M WANG, J THORNTON, JC MA, RM WEBER, DA AF PIERSON, RN RUSSELL, M WANG, J THORNTON, JC MA, RM WEBER, DA TI BODY CALCIUM BY INVIVO NEUTRON-ACTIVATION ANALYSIS (CA(IVNA)) IS PREDICTED BY DUAL PHOTON-ABSORPTIOMETRY (DPA) - COMPARISONS BY 3 DPA METHODS SO FASEB JOURNAL LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. COLUMBIA UNIV,ST LUKES ROOSEVELT HOSP,NEW YORK,NY 10025. NR 0 TC 3 Z9 3 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 19 PY 1993 VL 7 IS 3 BP A68 EP A68 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KP974 UT WOS:A1993KP97400389 ER PT J AU YASUMURA, S CHALIF, P MA, R DILMANIAN, FA PIERSON, RN AULET, M WEBER, DA AF YASUMURA, S CHALIF, P MA, R DILMANIAN, FA PIERSON, RN AULET, M WEBER, DA TI THE EFFECT OF CHANGES IN BODY SIZE ON TOTAL-BODY BONE-MINERAL CONTENT AS ASSESSED BY DUAL X-RAY ABSORPTIOMETRY IN PHANTOMS SO FASEB JOURNAL LA English DT Meeting Abstract C1 SUNY HSC,DEPT PHYSIOL,BROOKLYN,NY 11203. BROOKHAVEN NATL LAB,DEPT MED,UPTON,NY 11973. ST LUKES HOSP,NEW YORK,NY 10025. NR 0 TC 2 Z9 2 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 19 PY 1993 VL 7 IS 3 BP A85 EP A85 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA KP974 UT WOS:A1993KP97400489 ER PT J AU PATTON, HJ WALTER, WR AF PATTON, HJ WALTER, WR TI REGIONAL MOMENT - MAGNITUDE RELATIONS FOR EARTHQUAKES AND EXPLOSIONS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID WESTERN UNITED-STATES; DISCRIMINATION; YIELD; WAVES; MB; MS AB We present M(o):m(b) relations using m(b)(P(n)) and m(b)(L(g)) for earthquakes and explosions occurring in tectonic and stable areas. The observations for Mb(P(n)) range from about 3 to 6 and show excellent separation between earthquakes and explosions on M(o):M(b) Plots, independent of the magnitude. The scatter in M(o):M(b) observations for NTS explosions is small compared to the earthquake data. The M(o):m(b)(L(g)) data for Soviet explosions overlay the observations for U. S. explosions. These results, and the small scatter for NTS explosions, suggest weak dependence Of M(o):M(b) relations on emplacement media. A simple theoretical model is developed which matches all these observations. The model uses scaling similarity and conservation of energy to provide a physical link between seismic moment and a broadband seismic magnitude. Three factors, radiation pattern, material property, and apparent stress, contribute to the separation between earthquakes and explosions. This theoretical separation is independent of broadband magnitude. For U.S. explosions in different media, the material property and apparent stress contributions are shown to compensate for one another, supporting the observations that M(o):M(b) is nearly independent of source geology. RP PATTON, HJ (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT EARTH SCI,LIVERMORE,CA 94550, USA. RI Walter, William/C-2351-2013 OI Walter, William/0000-0002-0331-0616 NR 19 TC 19 Z9 20 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 FEB 19 PY 1993 VL 20 IS 4 BP 277 EP 280 DI 10.1029/93GL00298 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KQ020 UT WOS:A1993KQ02000006 ER PT J AU CHANG, HT YEUNG, ES AF CHANG, HT YEUNG, ES TI VOLTAGE PROGRAMMING IN CAPILLARY ZONE ELECTROPHORESIS SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID MICELLAR SOLUTIONS; SEPARATION AB Temperature is an important factor in capillary zone electrophoresis since it affects the viscosity and the pH of the buffer solution. In this study, a capillary tube with a large radius (130 mum I.D.) and filled with buffer at a high ionic strength is used to generate substantial joule heat within the capillary tube to force a significant increase in temperature, in turn to decrease the viscosity and to change the pH of the buffer solution. From a study of the degree of dissociation of analytes at different voltages, we show that voltage-induced pH change is significant in 0.1 M tris(hydroxyamino)methane (THAM) but not in 0.025 M hydrogencarbonate buffer system. A step change in voltage from 15 to 25 kV is implemented to generate a pH gradient in the THAM buffer solution. The results show that the method is useful for separating phenols which cannot be separated at a fixed voltage. C1 US DOE,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. RI Chang, Huan-Tsung/C-1183-2011; OI Chang, Huan-Tsung/0000-0002-5393-1410 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 0021-9673 J9 J CHROMATOGR PD FEB 19 PY 1993 VL 632 IS 1-2 BP 149 EP 155 PG 7 WC Chemistry, Analytical SC Chemistry GA KN834 UT WOS:A1993KN83400020 ER PT J AU UHLIR, LC DURBIN, PW JEUNG, NL RAYMOND, KN AF UHLIR, LC DURBIN, PW JEUNG, NL RAYMOND, KN TI SPECIFIC SEQUESTERING AGENTS FOR THE ACTINIDES .21. SYNTHESIS AND INITIAL BIOLOGICAL TESTING OF OCTADENTATE MIXED CATECHOLATE HYDROXYPYRIDINONATE LIGANDS SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID ENTEROBACTIN ANALOGS; MICE; COMPLEXATION; REMOVAL; 3,4,3-LICAM(C); PU-238(IV); SPERMIDINE; AMINOLYSIS; PROTECTION; CHEMISTRY AB The linear octadentate ligand 3,4,3-LIHOPO, which contains four 1-hydroxy-2(1H)-pyridinone (1,2-HOPO) groups, is the most effective agent for in vivo chelation of Pu(IV) yet prepared. However, its clinical potential is limited by acute toxicity of the free ligand (but not Fe3+ complex) at high dosage. The high acidity of HOPO ligands and the much lower acidity of catechol (CAM) ligands suggested that mixed octadentate (CAM-HOPO) ligands containing one or two 1,2-HOPO and three (or two) catechol (CAM) groups might be as effective for Pu removal [fully] eight-coordinated Pu(IV) complexes formed at pH greater-than-or-equal-to 6] and less toxic than 3,4,3-LIHOPO. Treatment of spermine with 3-(2,3-dimethoxybenzoyl)thiazol-idine-2-thione (1) (molar ratio 2:1) gave 1,14-bis(2,3-dimethoxybenzoyl)-1,5,10,14-tetraazatetradecane (2, DiCAM-spermine) in 80% yield. Addition of 2 to a 2-fold excess of the reaction product of 1-hydroxy-2-pyridone-6-carboxylic acid (HOPO-C) and 1,1'-carbonyldiimidazole (CDI) in NN-dimethylformamide (DMF) and deprotection with BBr3 gave 1,14-bis(2,3-dihydroxybenzoyl)-5,10-bis(1-hydroxy-2-pyridon-6-oyl)-l,5,10,14-tetraazatetradecane [3, 3,4,3-LI(diCAM-diHOPO)] in 5 % yield. Addition of 2 to an equimolar amount of the reaction product of HOPO-C and CDI in N,N-dimethylacetamide (DMAA), purification of the hexadentate intermediate, subsequent treatment with an equimolar amount of 2,3-dimethoxybenzoyl chloride (DMB), and deprotection with BBr3 gave 1,5,14-tris(2,3-dihydroxybenzoyl)-10(1-hydroxy-2-pyridon-6-oyl)-1,5,10,14-tetraazatetradecane [4, 3,4,3-LI(triCAM-HOPO)] in 5% yield. Ligands were administered to mice [30 mumol kg-I ip at 1 h or orally at 3 min after iv injection of plutonium(IV)-238 citrate, kill at 24 h]. Plutonium excretion after injection of either CAM-HOPO ligand was 700% of that for 24-h Pu-injected controls, 140% of that for mice given the tetracatecholate analogue 3,4,3-LICAM (significantly more, p < 0.01), but only 80 % of that promoted by 3,4,3-LIHOPO (significantly less). Orally administered 3,4,3-LI-(diCAM-diHOPO) promoted significantly more Pu excretion than an equimolar amount of CaNa3DTPA. Potency of the CAM-HOPO ligands for in vivo chelation of Pu(IV) resembled that of structurally hexadentate tris(hydroxypyridinonate) and tris(sulfocatecholate) ligands and functionally hexadentate tetrakis(sulfocatecholate) and tetrakis(carboxycatecholate) ligands. The Pu complexes of the CAM-HOPO ligands are to some degree unstable at pH < 7.4, as judged by Pu residues in kidneys in excess of 24-h Pu-injected controls. Synthetic yields were insufficient for chemical investigations or evaluation of acute toxicity. The apparent hexadentate behavior of the CAM-HOPO ligands for in vivo Pu(IV) complexation suggests that the 1,2-HOPO groups preferentially bound Pu(IV), and that one of the CAM groups failed to participate in Pu(IV) binding at physiological pH. C1 LAWRENCE BERKELEY LAB,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV RES MED & RADIAT BIOPHYS,BERKELEY,CA 94720. FU NIEHS NIH HHS [ES02698] NR 28 TC 21 Z9 22 U1 4 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD FEB 19 PY 1993 VL 36 IS 4 BP 504 EP 509 DI 10.1021/jm00056a011 PG 6 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA KN149 UT WOS:A1993KN14900011 PM 8386249 ER PT J AU VALENTINE, GA FISHER, RV AF VALENTINE, GA FISHER, RV TI GLOWING AVALANCHES - NEW RESEARCH ON VOLCANIC DENSITY CURRENTS SO SCIENCE LA English DT Editorial Material ID PYROCLASTIC FLOWS; NUMERICAL-MODELS; ERUPTION; EMPLACEMENT; IGNIMBRITE; DEPOSITION; TRANSPORT C1 UNIV CALIF SANTA BARBARA,DEPT GEOL SCI,SANTA BARBARA,CA 93106. RP VALENTINE, GA (reprint author), LOS ALAMOS NATL LAB,GEOANAL GRP,MS F665,LOS ALAMOS,NM 87545, USA. NR 29 TC 11 Z9 11 U1 1 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD FEB 19 PY 1993 VL 259 IS 5098 BP 1130 EP 1131 DI 10.1126/science.259.5098.1130 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KM917 UT WOS:A1993KM91700029 PM 17794392 ER PT J AU LOTT, JA SCHNEIDER, RP VAWTER, GA ZOLPER, JC MALLOY, KJ AF LOTT, JA SCHNEIDER, RP VAWTER, GA ZOLPER, JC MALLOY, KJ TI VISIBLE (660 NM) RESONANT CAVITY LIGHT-EMITTING-DIODES SO ELECTRONICS LETTERS LA English DT Article DE LIGHT-EMITTING DIODES; DIODES; SEMICONDUCTOR DEVICES AND MATERIALS AB The demonstration of the first visible resonant cavity light-emitting diodes (RCLEDs) is reported. The devices consist of an InAlGaP strained quantum well active region surrounded by AlAs/AlGaAs distributed Bragg reflectors. Linewidths from 0.9 nm (2.6 meV) to 45 run (12.8 mev) were obtained by varying the cavity quality factor (Q). C1 UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131. UNIV NEW MEXICO,DEPT ELECT & COMP ENGN,ALBUQUERQUE,NM 87131. RP LOTT, JA (reprint author), SANDIA NATL LABS,COMPOUND SEMICOND RES LAB,ALBUQUERQUE,NM 87185, USA. RI Malloy, Kevin/E-5994-2010 NR 8 TC 16 Z9 16 U1 1 U2 4 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD FEB 18 PY 1993 VL 29 IS 4 BP 328 EP 329 DI 10.1049/el:19930222 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA LB766 UT WOS:A1993LB76600003 ER PT J AU KALAKKAD, D ANDERSON, SL LOGAN, AD PENA, J BRAUNSCHWEIG, EJ PEDEN, CHF DATYE, AK AF KALAKKAD, D ANDERSON, SL LOGAN, AD PENA, J BRAUNSCHWEIG, EJ PEDEN, CHF DATYE, AK TI N-BUTANE HYDROGENOLYSIS AS A PROBE OF SURFACE SITES IN RHODIUM METAL PARTICLES - CORRELATION WITH SINGLE-CRYSTALS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID OXIDATION; CATALYSTS; REDUCTION AB Rh metal was supported on alumina and silica supports and the particle size was varied (from <1 to >5 nm) by changing the metal loading from 0.03 to 7.2 mumol of Rh/m2 of support. Metal particle sizes were determined by transmission electron microscopy. Hydrogenolysis of n-butane was used as a probe reaction. The effect of particle size and preoxidation on the hydrogenolysis activity and product selectivity was studied. The ethane selectivity of the highly dispersed Rh was very different from that of the low index single crystal surfaces of Rh. As particle size was increased, the selectivity of the catalysts approached that of Rh(111). Annealing the catalysts at 773 K in H-2 led to better agreement between the supported Rh and single-crystal Rh(111). None of the catalysts after initial H-2 reduction resembled the (100) or (110) surfaces in their hydrogenolysis selectivity. Since the (111 ) close packed surface would be favored during particle growth, it is understandable that these high temperature treatments lead to better agreement between the behavior of small particles and single crystals. C1 UNIV NEW MEXICO,DEPT CHEM & NUCL ENGN,ALBUQUERQUE,NM 87131. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. OI Peden, Charles/0000-0001-6754-9928; Datye, Abhaya/0000-0002-7126-8659 NR 18 TC 39 Z9 39 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 18 PY 1993 VL 97 IS 7 BP 1437 EP 1444 DI 10.1021/j100109a031 PG 8 WC Chemistry, Physical SC Chemistry GA KM694 UT WOS:A1993KM69400031 ER PT J AU LAFEMINA, JP KAFAFI, SA AF LAFEMINA, JP KAFAFI, SA TI PHOTOPHYSICAL PROPERTIES AND INTRAMOLECULAR CHARGE-TRANSFER IN SUBSTITUTED POLYIMIDES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRONIC-STRUCTURE; ULTRAVIOLET-ABSORPTION; LASER ABLATION; EMISSION; SPECTROSCOPY; FILMS; MODEL; AM1 AB The relationship between the geometric and electronic structure and the photophysical properties of a series of isoelectronic aromatic polyimides is explored. The polymer backbone geometries are computed using the semiempirical quantum-chemical AM1 method, while the electronic structure and photophysical properties are computed using the spectroscopically parametrized CNDO/S3 model. It is shown that an analysis of the geometric changes at the isoelectronic substitution site and the effect of the geometric changes on the electronic structure permit the prediction of changes in the intermolecular charge transfer (ICT) band of the optical absorption spectra and in the emission spectra. Moreover, this work demonstrates how experimentally observed differences in the photophysical properties of this class of polymers can be correlated to backbone conformation differences. C1 JOHNS HOPKINS UNIV, DIV ENVIRONM CHEM, BALTIMORE, MD 21205 USA. RP LAFEMINA, JP (reprint author), PACIFIC NW LAB, MOLEC SCI RES CTR, POB 999, RICHLAND, WA 99352 USA. NR 29 TC 8 Z9 8 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 18 PY 1993 VL 97 IS 7 BP 1455 EP 1458 DI 10.1021/j100109a034 PG 4 WC Chemistry, Physical SC Chemistry GA KM694 UT WOS:A1993KM69400034 ER PT J AU XU, J GRAVES, HL AF XU, J GRAVES, HL TI INTEGRATED SOFTWARE SYSTEM FOR SEISMIC EVALUATION OF NUCLEAR-POWER-PLANT STRUCTURES SO COMPUTERS & STRUCTURES LA English DT Article AB This paper describes the capabilities and theoretical bases of the computer software CARES (Computer Analysis for Rapid Evaluation of Structures) developed by the Brookhaven National Laboratory (BNL) for the U.S. Nuclear Regulatory Commission. The development of CARES represents an effort to utilize established numerical methodologies commonly employed by industry for structural safety evaluations of nuclear power plant facilities and incorporate them into an integrated computer software package operated on personal computers (PC). CARES was developed with the objective to include all aspects of seismic performance evaluation of nuclear power structures, thereby it can be used to evaluate the validity and accuracy of analysis methodologies used for structural safety evaluations of nuclear power plants by various utilities. CARES is structured in a modular format, each module performing a specific type of analysis. This paper describes the features which have been implemented into the seismic module of CARES. The seismic module integrates the capabilities required to accomplish all steps of a complete seismic analysis into a single package with many user-friendly features such as interactiveness and quick turnaround. Linear structural theory and pseudo-linear convolution theory are utilized as the bases for the development with a special emphasis on the areas of nuclear regulatory requirements pertaining to structural safety of nuclear plants. The organization of the seismic module is arranged in eight options, each performing a specific step of the analysis with most of input/output interfacing processed by the general manager. Finally, CARES provides comprehensive post-processing capability to display results graphically or in tabular form so that direct comparisons can be easily made. C1 US NUCL REGULATORY COMMISS,WASHINGTON,DC. RP XU, J (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 11 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7949 J9 COMPUT STRUCT JI Comput. Struct. PD FEB 17 PY 1993 VL 46 IS 4 BP 717 EP 723 DI 10.1016/0045-7949(93)90400-8 PG 7 WC Computer Science, Interdisciplinary Applications; Engineering, Civil SC Computer Science; Engineering GA KT157 UT WOS:A1993KT15700014 ER PT J AU NORTON, GA AF NORTON, GA TI A REVIEW OF THE DERIVATIVE THERMOGRAVIMETRIC TECHNIQUE (BURNING PROFILE) FOR FUEL COMBUSTION STUDIES SO THERMOCHIMICA ACTA LA English DT Review ID COAL; REACTIVITY; BEHAVIOR AB Burning profiles obtained by derivative thermogravimetric analysis are useful for obtaining relative combustion characteristics of fuels and for predicting combustion performance in boilers. However, the interpretation of these profiles is not always straightforward, particularly with respect to the combustion peaks. In this paper, the use of burning profiles for coal reactivity studies is reviewed. Factors which affect the appearance of the combustion peaks in the burning profiles and complicate data interpretation are summarized. Special emphasis is given to catalytic effects, because this factor is often not adequately considered when interpreting the data. RP NORTON, GA (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 16 TC 22 Z9 23 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-6031 J9 THERMOCHIM ACTA JI Thermochim. Acta PD FEB 17 PY 1993 VL 214 IS 2 BP 171 EP 182 DI 10.1016/0040-6031(93)80053-D PG 12 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA KP503 UT WOS:A1993KP50300001 ER PT J AU FAY, SP DOMALEWSKI, MD SKLAR, LA AF FAY, SP DOMALEWSKI, MD SKLAR, LA TI EVIDENCE FOR PROTONATION IN THE HUMAN NEUTROPHIL FORMYL PEPTIDE RECEPTOR-BINDING POCKET SO BIOCHEMISTRY LA English DT Article ID REAL-TIME ANALYSIS; G-PROTEIN; LIGAND; DYNAMICS; FLUORESCEIN AB We have studied the interaction of a family of fluorescent formyl peptides with their receptor using spectrofluorometric and flow cytometric methods. The peptides contained four (CHO-Met-Leu-Phe-Lys-fluorescein), five (CHO-Met-Leu-Phe-Phe-Lys-fluorescein), or six (CHO-Nle-Leu-Phe-Nle-Tyr-Lys-fluorescein) amino acids. As observed in earlier studies, the fluorescent peptides containing four and five amino acids were quenched upon binding to the receptor, while the hexapeptide was not. While the degree of quenching of the bound tetrapeptide was largely unchanged, the quenching of the bound pentapeptide decreased with increasing pH over the range of pH 6.5-9.0. Ligand binding studies have shown that the mole fraction of tetrapeptide or pentapeptide bound in kinetic analysis markedly decreased with increasing pH as a consequence of increasing ligand dissociation rate constant. The dependence of the binding parameters for the hexapeptide on pH was much less pronounced. Over a pH range from pH 7.3 to 9.0, the hexapeptide showed little change in binding affinity, while the tetrapeptide and pentapeptide increased in K(d) approximately 2.0- and 2.5-fold, respectively. These results indicate that the formyl peptide receptor binding pocket contains at least two microenvironments. The pH sensitivity of the pentapeptide quenching is consistent with a protonating environment, while the pH-independent quenching of the tetrapeptide may reflect aromatic stacking or a hydrophobic microenvironment. The pH-dependent ligand dissociation also suggests that the protonation in the pocket stabilizes ligand binding, which may indicate an alteration in the binding pocket structure. Protonation or hydrogen bonding of the pentapeptide may lead to even further stabilization of that ligand. C1 UNIV NEW MEXICO, SCH MED, ALBUQUERQUE, NM 87131 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. FU NCRR NIH HHS [RR 01315]; NIAID NIH HHS [AI19032] NR 19 TC 29 Z9 29 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 16 PY 1993 VL 32 IS 6 BP 1627 EP 1631 DI 10.1021/bi00057a029 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KM703 UT WOS:A1993KM70300029 PM 8431442 ER PT J AU RIEKER, TP HALTIWANGER, C EIDMAN, K WALBA, DW CLARK, NA LARSON, AC AF RIEKER, TP HALTIWANGER, C EIDMAN, K WALBA, DW CLARK, NA LARSON, AC TI STRUCTURE OF 2-PHENYLACETOPHENONE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The crystal structure of 2-phenylacetophenone (C6H5-CH2-CO-C6H5) (CAS registry number 451-40-1) has been determined from 945 measured X-ray reflections with I greater-than-or-equal-to sigma (I). The dihedral angle between the two benzene ring planes is 64.2-degrees. C1 UNIV COLORADO,DEPT CHEM,BOULDER,CO 80309. UNIV COLORADO,DEPT PHYS,BOULDER,CO 80309. RP RIEKER, TP (reprint author), LOS ALAMOS NATL LAB,MANUEL LUJAN JR NEUTRON SCATTERING CTR,LOS ALAMOS,NM 87545, USA. RI Clark, Noel/E-9011-2010; Walba, David/F-7284-2013 NR 8 TC 3 Z9 3 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD FEB 15 PY 1993 VL 49 BP 406 EP 408 DI 10.1107/S0108270192009442 PN 2 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA KP373 UT WOS:A1993KP37300082 ER PT J AU LOO, JA EDMONDS, CG SMITH, RD AF LOO, JA EDMONDS, CG SMITH, RD TI TANDEM MASS-SPECTROMETRY OF VERY LARGE MOLECULES .2. DISSOCIATION OF MULTIPLY CHARGED PROLINE-CONTAINING PROTEINS FROM ELECTROSPRAY IONIZATION SO ANALYTICAL CHEMISTRY LA English DT Article ID FAST-ATOM-BOMBARDMENT; COLLISION-INDUCED DISSOCIATION; SURFACE-INDUCED DISSOCIATION; INDUCED DECOMPOSITION; SEQUENCE INFORMATION; PEPTIDE DERIVATIVES; FIELD DESORPTION; HIGH-RESOLUTION; SERUM-ALBUMIN; CYTOCHROME-C AB Collisional dissociation tandem mass spectra have been obtained for multiply charged molecules produced by electrospray ionization for a variety of proline-containing proteins extending up to 22 000 molecular weight. Interpretation of limited ml z range, low-resolution tandem mass spectra from multiply charged precursors can present difficulties due to the possibility of multiply charged product ions and the lack of unambiguous charge-state information. Methods used to guide the spectral interpretation process under these circumstances are discussed. Proline is a unique amino acid constituent because its side chain is bonded to the tertiary nitrogen in a cyclic pyrrolidine ring. For large polypeptides containing proline residues, we have observed that fragmentation due to cleavage of the amide bond to proline is often dominant. Such proline-directed processes are often the only dissociation pathways observed for large proteins. This is attributed to the quasi-thermal nature of large molecule collisional activation/dissociation processes and the lower dissociation energies for peptide bonds near proline residues. The present results also suggest possible effects on the dissociation processes for large molecules due to charge location and perhaps protein conformation. 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 103 TC 226 Z9 228 U1 0 U2 20 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD FEB 15 PY 1993 VL 65 IS 4 BP 425 EP 438 DI 10.1021/ac00052a020 PG 14 WC Chemistry, Analytical SC Chemistry GA KL859 UT WOS:A1993KL85900020 PM 8382455 ER PT J AU BEGUIN, Y CLEMONS, GK POOTRAKUL, P FILLET, G AF BEGUIN, Y CLEMONS, GK POOTRAKUL, P FILLET, G TI QUANTITATIVE ASSESSMENT OF ERYTHROPOIESIS AND FUNCTIONAL CLASSIFICATION OF ANEMIA BASED ON MEASUREMENTS OF SERUM TRANSFERRIN RECEPTOR AND ERYTHROPOIETIN SO BLOOD LA English DT Article ID PLASMA; IRON; RADIOIMMUNOASSAY; ERYTHROCYTOSIS; FERRITIN; DISEASE C1 MAHIDOL UNIV,SIRIRAJ HOSP,FAC GRAD STUDIES,CTR THALASSEMIA,BANGKOK 10700,THAILAND. LAWRENCE BERKELEY LAB,DIV CELLULAR & MOLEC BIOL,BERKELEY,CA 94720. MAHIDOL UNIV,SIRIRAJ HOSP,DEPT MED,DIV HEMATOL,BANGKOK 10700,THAILAND. RP BEGUIN, Y (reprint author), STATE UNIV LIEGE,CHU SART TILMAN,DEPT HEMATOL,B-4000 LIEGE,BELGIUM. FU NHLBI NIH HHS [HL22469, HL34408] NR 33 TC 190 Z9 195 U1 0 U2 3 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD FEB 15 PY 1993 VL 81 IS 4 BP 1067 EP 1076 PG 10 WC Hematology SC Hematology GA KM419 UT WOS:A1993KM41900028 PM 8427988 ER PT J AU VANDERSLUYS, WG BERG, JM BARNHARDT, D SAUER, NN AF VANDERSLUYS, WG BERG, JM BARNHARDT, D SAUER, NN TI TETRAHYDROFURAN ADDUCTS OF URANIUM TETRACHLORIDE SO INORGANICA CHIMICA ACTA LA English DT Article ID CRYSTAL-STRUCTURE; TRIVALENT URANIUM; CHEMISTRY; DERIVATIVES; COMPLEXES; THORIUM AB Pale green crystals of UCl4(THF)3 (1) were isolated from saturated THF solutions after standing undisturbed for 12 h. The molecular structure of the compound was determined by single crystal X-ray diffraction. The molecule adopts a unique structure based on a distorted pentagonal bipyramid with two chlorides occupying the axial positions and the other two chlorides occupying adjacent positions in the pentagonal plane. Crystal data for 1 (UCl4O4C12H24) at 203 K: monoclinic space group P2(1), a = 7.835(1), b = 14.428(1), c = 8.456(1) angstrom, beta = 100.97(1)-degrees, Z = 2, D(calc) = 2.110 g cm-3. C1 LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87545. RP VANDERSLUYS, WG (reprint author), UNIV MONTANA,DEPT CHEM,MISSOULA,MT 59812, USA. NR 32 TC 18 Z9 18 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD FEB 15 PY 1993 VL 204 IS 2 BP 251 EP 256 DI 10.1016/S0020-1693(00)82933-3 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA KP380 UT WOS:A1993KP38000018 ER PT J AU MAY, GB PERRY, KE SHULL, JL EPSTEIN, JS OKADA, H SCOTT, C ATLURI, SN AF MAY, GB PERRY, KE SHULL, JL EPSTEIN, JS OKADA, H SCOTT, C ATLURI, SN TI NONSINGULAR TOUGHENING AND R-CURVE BEHAVIOR IN NOMINALLY PURE ALUMINA SO INTERNATIONAL JOURNAL OF FRACTURE LA English DT Article ID BRITTLE SOLIDS; CRACK-GROWTH; GRAIN-SIZE; RESISTANCE AB More interferometry is employed to study toughening in medium to large grain size nominally pure alumina. The fracture scale length, which is characterized by the grain size of the alumina, is systematically varied from 35 to 102 mum. R curves are derived from bulk mode I compliance calculations for the differing grain sizes and from the near tip moire fringes. The level of material toughening that arises from the nonsingular processes of crack bridging and grain boundary friction are found by comparing the bulk and near tip moire R curves. C1 UNIV STRATHCLYDE,DEPT PROC & MECH ENGN,STRATHCLYDE G1 1XJ,SCOTLAND. IDAHO NATL ENGN LAB,FRACTURE BEHAV SECT,IDAHO FALLS,ID 83415. NISSAN MOTOR CO LTD,VEHICLE RES LAB,YOKUSKA 237,JAPAN. GEORGIA INST TECHNOL,CTR COMPUTAT MODELLING & INFRASTRUCT REHABIL,ATLANTA,GA 30332. UNIV ILLINOIS,DEPT MAT SCI,URBANA,IL 61801. GE,DIV LIGHTING PROD,CLEVELAND,OH 44112. RP MAY, GB (reprint author), UNIV WASHINGTON,DEPT MECH ENGN,SEATTLE,WA 98195, USA. RI Atluri, Satya/C-5040-2013 OI Atluri, Satya/0000-0001-6793-9619 NR 18 TC 1 Z9 1 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0376-9429 J9 INT J FRACTURE JI Int. J. Fract. PD FEB 15 PY 1993 VL 59 IS 4 BP 361 EP 375 PG 15 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA LA182 UT WOS:A1993LA18200004 ER PT J AU ETTEDGUI, E PARK, KT CAO, JM GAO, Y RUCKMAN, MW AF ETTEDGUI, E PARK, KT CAO, JM GAO, Y RUCKMAN, MW TI GROWTH OF A CR OXIDE LAYER ON GAAS(100) BY OXIDATION WITH CONDENSED WATER SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CORE-LEVEL PHOTOEMISSION; CLEAVED GAAS(110); OXYGEN-ADSORPTION; INTERFACES; SURFACES; STATES; CR2O3 AB A Cr oxide layer produced by the deposition of Cr onto a condensed H2O overlayer on a GaAs(100) wafer at T=90 K was studied using synchrotron radiation photoemission. Cr reacted with H2O immediately upon deposition at low temperature resulting in the synthesis of hydrated Cr oxide compounds, and then formed a stable dry oxide as the temperature of the substrate was raised toward room temperature and eventually 400-degrees-C. The oxide was stable up to a temperature of at least 400-degrees-C, although the substrate did show changes indicative of reaction. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP ETTEDGUI, E (reprint author), UNIV ROCHESTER,DEPT PHYS & ASTRON,ROCHESTER,NY 14627, USA. RI Gao, Yongli/N-8392-2015 OI Gao, Yongli/0000-0001-9765-5246 NR 32 TC 1 Z9 1 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 FEB 15 PY 1993 VL 73 IS 4 BP 1781 EP 1787 DI 10.1063/1.353214 PG 7 WC Physics, Applied SC Physics GA KM233 UT WOS:A1993KM23300031 ER PT J AU CHEN, X PEREL, AS BROOKS, JS GUERTIN, RP HINKS, DG AF CHEN, X PEREL, AS BROOKS, JS GUERTIN, RP HINKS, DG TI SPECIFIC-HEAT MEASUREMENTS OF PRESSURE-INDUCED REENTRANT SUPERCONDUCTIVITY IN EU0.9HO0.1MO6S8 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID EU(HO)MO6S8; MAGNETISM AB Specific heat measurements of Eu0.9Ho0.1Mo6S8 were performed using an ac calorimetry technique under the extreme conditions of low temperature, high magnetic field, and hydrostatic pressure. The title compound is a Chevrel phase material, which is paramagnetic at ambient pressure, becomes superconducting for pressures above 7 kbar, and has a reentrant upper critical field [dHc2(T)/dT>0, as T --> 0 K]. Evidence that this material also has a high field-induced superconducting phase at low temperatures (H > 5 T, T < 1 K) was previously reported. The present ac calorimetry study carried out for 0.15 less-than-or-equal-to T less-than-equal-to 6 K, 0 less-than-or-equal-to H less-than-or-equal-to 20 T, and P congruent-to 8 kbar, shows a sharp superconducting transition for T < 1 K in the specific heat, which broadens at higher fields and temperatures. The results are analyzed to obtain a reentrant phase in agreement with previous transport work, but direct evidence for the high field-induced phase was not found. The mechanism for the field and temperature dependence of the superconductivity of Eu0.9Ho0.1Mo6S8 is discussed. C1 TUFTS UNIV,MEDFORD,MA 02155. ARGONNE NATL LAB,ARGONNE,IL 60439. RP CHEN, X (reprint author), BOSTON UNIV,BOSTON,MA 02215, USA. NR 10 TC 12 Z9 12 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 FEB 15 PY 1993 VL 73 IS 4 BP 1886 EP 1891 DI 10.1063/1.353176 PG 6 WC Physics, Applied SC Physics GA KM233 UT WOS:A1993KM23300047 ER PT J AU OTIS, CE GOODWIN, PM AF OTIS, CE GOODWIN, PM TI INTERNAL ENERGY-DISTRIBUTIONS OF LASER ABLATED SPECIES FROM YBA2CU3O7-DELTA SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INDUCED PLASMA PLUME; TEMPERATURE SUPERCONDUCTOR YBA2CU3O7; METAL-OXIDE SUPERCONDUCTORS; HIGH-TC; FLUORESCENCE SPECTROSCOPY; THIN-FILMS; TRAPPED O2; EMISSION; DYNAMICS; YBACUO AB The first simultaneous measurements of the ground-state translational, rotational, and vibrational energy distributions of a laser ablated diatomic molecule (YO) liberated during a 351 nm excimer laser ablation of YBa2Cu3O7-delta, are reported. In addition, the translational energy distributions of Y, Y+, Ba, Ba+, and Cu are reported. Measurements made at low and high fluences on YO indicate that there are very large differences in the ''temperatures'' inferred between the translational and the vibrational/rotational energy channels, implying that energy is partitioned in a very nonequilibrium fashion in the expanding plume. A measurement of the rotational and vibrational temperatures shows that the internal degrees of freedom are equilibrated in the expansion plume (Boltzmann distributions) with a temperature of approximately 1000 K being observed at normal processing fluences. The translational energy distributions of YO are observed to fit a shifted Boltzmann distribution at high fluences. The atomic species monitored all display non-Boltzmann velocity distributions at high fluences. The peak of the observed velocity distributions corresponds to energies as high as 10 eV for the YO neutral diatomic and up to several hundred eV for Ba+ at ablation fluences of 5 J/cm2. Bimodal velocity distributions are observed for the Cu, Ba, and Y neutral atoms at high incident fluences, implying ion-electron recombination as a partial source of the high neutral velocities. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP OTIS, CE (reprint author), IBM CORP,DIV RES,TJ WATSON RES CTR,POB 218,YORKTOWN HTS,NY 10598, USA. NR 39 TC 52 Z9 53 U1 0 U2 5 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 FEB 15 PY 1993 VL 73 IS 4 BP 1957 EP 1964 DI 10.1063/1.353186 PG 8 WC Physics, Applied SC Physics GA KM233 UT WOS:A1993KM23300059 ER PT J AU SANFORD, TWL POUKEY, JW HALBLEIB, JA MOCK, RC MCATEE, WH AF SANFORD, TWL POUKEY, JW HALBLEIB, JA MOCK, RC MCATEE, WH TI VOLTAGE DEPENDENCE OF ELECTRON DYNAMICS IN HIGH-POWER EXTENDED PLANAR-ANODE DIODES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID 700-KA; FIELD; FLOW AB Measurements confirm the ability of a numerical model to simulate basic features of electron flow and subsequent radiation output from EPA (extended planar-anode) diodes on HERMES III. HERMES III is a 19 MV, 700 kA, 25 ns electron accelerator. These diodes simultaneously terminate a coaxial MITL (magnetically insulated transmission line), and produce intense bursts of bremsstrahlung. The measurements and modeling show that (a) the EPA diode provides an impedance match to the MITL, (b) parapotential flow theory and the range of H-ions generated at the cathode can be used to measure the time-dependent voltage pulse and peak voltage V(P), respectively, and (c) that approximately 95% of the electrical energy transmitted to the diode can be converted to kinetic energy of electrons incident on bremsstrahlung targets. Further, it is demonstrated that the forward radiation fluence can be described by DA/Q = (76 +/- 11) V1.61 over the V(P) range 13-19 MV. DA, Q, and V refer to the forward radiation fluence measured in Mrad(CaF2) cm2, the incident charge measured in C, and the median current-weighted accelerating voltage measured in MV, respectively. The dependence on V(P) of the beam characteristics at the targets is shown and the detailed kinetic-energy distribution there is discussed. RP SANFORD, TWL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 27 TC 5 Z9 6 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 FEB 15 PY 1993 VL 73 IS 4 BP 2004 EP 2014 DI 10.1063/1.353166 PG 11 WC Physics, Applied SC Physics GA KM233 UT WOS:A1993KM23300066 ER PT J AU BAE, YC SHIM, JJ SOANE, DS PRAUSNITZ, JM AF BAE, YC SHIM, JJ SOANE, DS PRAUSNITZ, JM TI REPRESENTATION OF VAPOR LIQUID AND LIQUID LIQUID EQUILIBRIA FOR BINARY-SYSTEMS CONTAINING POLYMERS - APPLICABILITY OF AN EXTENDED FLORY HUGGINS EQUATION SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID PAIR INTERACTION PARAMETER; CLOUD-POINT CURVES; PHASE-SEPARATION; LATTICE MODEL; POLYSTYRENE; CYCLOHEXANE; DIAGRAMS; SOLVENT AB For some binary systems, an extended Flory-Huggins equation is applicable to both vapor-liquid equilibria (VLE) and liquid-liquid equilibria (LLE) using the same adjustable parameters. New LLE and VLE data are reported for polystyrene (PS) (MW = 100,00)/cyclohexane and for poly(ethylene glycol) (PEG) (MW = 8,000)/water. Experimental results for the PS/cyclohexane system agree well with the semiempirical model, whereas those for PEG/water do not, probably because, for PEG/water, the temperature range of the VLE data is about 55-degrees-C lower than that of the LLE data. Excellent fits were obtained for our previously published experimental results for PS/cyclohexane (upper critical solution temperature, UCST), PS/ethyl acetate (lower critical solution temperature, LCST), PS/tert-butylacetate and PS/methyl acetate (both UCST and LCST), and PEG/water (closed-loop). The semiempirical model also fits well with new data obtained for the polymer blend PS/poly(vinyl methyl ether). C1 LAWRENCE BERKELEY LAB,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 26 TC 165 Z9 166 U1 4 U2 44 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD FEB 15 PY 1993 VL 47 IS 7 BP 1193 EP 1206 DI 10.1002/app.1993.070470707 PG 14 WC Polymer Science SC Polymer Science GA KH414 UT WOS:A1993KH41400007 ER PT J AU LEBRUN, T LAVOLLEE, M SIMON, M MORIN, P AF LEBRUN, T LAVOLLEE, M SIMON, M MORIN, P TI DISSOCIATION DYNAMICS OF CORE EXCITED N2O SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NITROUS-OXIDE; ION COINCIDENCE; AUGER-ELECTRON; FRAGMENTATION; MOLECULES; ENERGY; PHOTOIONIZATION; IONIZATION; STATES; DECAY AB Fragmentation of N2O after selective core excitation Of terminal and central nitrogen, has been studied by a multicoincidence technique (PEPIPICO) using synchrotron radiation. We show that dissociation dynamics is dependent upon the excited site, especially in the case of the ''atomization'' of the molecule. The central nitrogen is always found with very little kinetic energy, except after Nt --> PI* transition. A bent intermediate geometry is proposed to explain this observation. C1 CENS,DRECAM,SPAM,CEA,F-91191 GIF SUR YVETTE,FRANCE. ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439. RP LEBRUN, T (reprint author), UNIV PARIS 11,LURE,BAT 209D,F-91405 ORSAY,FRANCE. NR 20 TC 80 Z9 80 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1993 VL 98 IS 4 BP 2534 EP 2540 DI 10.1063/1.464137 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KP938 UT WOS:A1993KP93800005 ER PT J AU RUSCIC, B BERKOWITZ, J AF RUSCIC, B BERKOWITZ, J TI PHOTOIONIZATION MASS-SPECTROMETRY OF CH2S AND HCS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID GAS-PHASE BASICITIES; PHOTO-IONIZATION; PHOTOELECTRON-SPECTROSCOPY; PROTON AFFINITIES; IONS; THIOFORMALDEHYDE; MOLECULES; HEATS; CS AB The transient species CH2S and HCS were studied by photoionization mass spectrometry. They were prepared in situ from CH3SH by sequential hydrogen abstraction with fluorine atoms. CH2S was also prepared by pyrolysis of CH3SCl and CH3SSCH3. The photoion yield curve of CH2S displays an abrupt threshold, and is similar in overall shape to that of the homologue CH2O. The adiabatic ionization potential of CH2S is found to be 9.376 +/- 0.003 eV. Evidence has been found for nd and/or ns and np Rydberg states converging to the first excited state of CH2S+. In addition, the HCS+ fragment from CH2S has been determined to appear at less-than-or-equal-to 11.533 +/-0.021 eV at 0 K. In contrast to CH2S, the photoion yield curve of HCS+ from HCS displays a very broad Franck-Condon envelope, consistent with a transition from bent HCS to linear HCS+. A Poisson fit to the experimental Franck-Condon factors indicates that the adiabatic ionization potential of HCS is less-than-or-equal-to 7.499 +/- 0.005 eV, and perhaps as low as 7.412 +/- 0.007 eV. The fragment curves at m/e = 46, 47, 48, and 49 from CH3SSCH3 have also been examined, and their relative shifts in energy determined. Together with measurements on CH2S and HCS, and the previously reported DELTAH(f0)-degrees (CH2SH+) = 211.5 +/- 2. 0 kcal/mol (less-than-or-equal-to 213.1 +/- 0.2 kcal/mol), this is sufficient to establish DELTAH(f0)-degrees (CH2S) = 28.3 +/- 2.0 kcal/mol (less-than-or-equal-to 29.9 +/- 0.9 kcal/mol) and DELTAH(f0)-degrees (HCS) = 71.7 +/- 2.0 kcal/mol (less-than-or-equal-to 73.3 +/- 1.0 kcal/mol), greater-than-or-equal-to 69.7 +/- 2.0 kcal/mol). These values are in very good agreement with recent ab initio calculations. The implications for various bond energies within the CH(n)S system are also discussed. 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 34 TC 74 Z9 76 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1993 VL 98 IS 4 BP 2568 EP 2579 DI 10.1063/1.464139 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KP938 UT WOS:A1993KP93800008 ER PT J AU DAVIS, MJ AF DAVIS, MJ TI HIERARCHICAL ANALYSIS OF MOLECULAR-SPECTRA SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EMISSION PUMPING SPECTROSCOPY; DISPERSED FLUORESCENCE; VIBRATIONAL ASSIGNMENT; PATTERN-RECOGNITION; ENERGY-TRANSFER; CHEMICAL DATA; DYNAMICS; NO2; FLUCTUATIONS; ACETYLENE AB A method of characterizing molecular spectra is proposed here. Hierarchical trees are generated from molecular spectra by following the branching of peaks as resolution is changed continuously. The trees are analyzed using several techniques developed in the classification and multivariate analysis literature. The information obtained from these techniques includes (1) dimensionality of geometrical representations of the trees; (2) clustering statistics; and (3) number of distinct time scales inherent in the spectra. Several model spectra are studied to establish the utility of the hierarchical analysis and a portion of a vibronic spectrum of NO2 is also investigated. RP DAVIS, MJ (reprint author), ARGONNE NATL LAB,DEPT CHEM,ARGONNE,IL 60439, USA. NR 56 TC 54 Z9 54 U1 0 U2 4 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1993 VL 98 IS 4 BP 2614 EP 2641 DI 10.1063/1.464143 PG 28 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KP938 UT WOS:A1993KP93800012 ER PT J AU ZHU, L HO, J PARKS, EK RILEY, SJ AF ZHU, L HO, J PARKS, EK RILEY, SJ TI TEMPERATURE-DEPENDENCE OF THE REACTION OF NICKEL CLUSTERS WITH DEUTERIUM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID IRON CLUSTERS; HYDROGEN ADSORPTION; KINETICS; D2; DYNAMICS; SURFACES; AMMONIA; NI(111) AB The kinetics of reactions of D2 with Ni9 through Ni14 are studied in a flow-tube reactor over the temperature range 133-413 K. Rate constants for the dissociative chemisorption of the first D2 molecule have been determined. Reaction probabilities are near unity for Ni10-Ni14 and are essentially independent of temperature. For Ni9, the reaction probability is about 5% between 213 and 413 K, but increases below 213 K to approximately 50% at 13 3 K. The possibility that these reactions are mediated by a physisorbed precursor state is discussed. The increase in Ni9 reactivity below 213 K is interpreted as due to an increase in the initial trapping of the D2 molecule on the cluster's surface. RP ZHU, L (reprint author), ARGONNE NATL LAB, DEPT CHEM, ARGONNE, IL 60439 USA. NR 20 TC 34 Z9 34 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1993 VL 98 IS 4 BP 2798 EP 2804 DI 10.1063/1.464161 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KP938 UT WOS:A1993KP93800031 ER PT J AU ZHANG, BL WANG, CZ HO, KM XU, CH CHAN, CT AF ZHANG, BL WANG, CZ HO, KM XU, CH CHAN, CT TI THE GEOMETRY OF LARGE FULLERENE CAGES - C-72 TO C-102 SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CARBON; CLUSTERS; C76 AB Combining an efficient simulated annealing scheme for generating closed, hollow, spheroidal cage structures with a tight-binding molecular-dynamics method for energy optimization, the ground-state structure of every even-numbered carbon fullerene from C72 to C102 is determined. As a general trend, most ground-state structures of the large fullerenes have relatively low symmetries. In many cases, several isomers of a fullerene are found to have competitively low energies, which suggests that a mixture of these isomers can be observed in experimental prepared samples. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP ZHANG, BL (reprint author), US DOE,AMES LAB,AMES,IA 50011, USA. NR 29 TC 103 Z9 104 U1 0 U2 6 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1993 VL 98 IS 4 BP 3095 EP 3102 DI 10.1063/1.464084 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KP938 UT WOS:A1993KP93800060 ER PT J AU SEVICK, EM BELL, AT THEODOROU, DN AF SEVICK, EM BELL, AT THEODOROU, DN TI A CHAIN OF STATES METHOD FOR INVESTIGATING INFREQUENT EVENT PROCESSES OCCURRING IN MULTISTATE, MULTIDIMENSIONAL SYSTEMS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID SURFACE SELF-DIFFUSION; REACTION-PATH; CONFORMATIONAL TRANSITIONS; REACTION COORDINATE; HELIX FORMATION; ALGORITHM; LIQUIDS AB This paper describes novel numerical methods for constructing reaction paths and evaluating transition state theory (TST) rate constants for multidimensional, multistate systems. The reaction path is represented as a tethered, freely jointed chain of states with configuration specified by minimization of a function that is derived from the differential description of the path. The method is general and applicable to systems of arbitrary dimension and does not require a priori knowledge of the first-order saddle point, or the topology of the states. Also presented is a novel procedure for numerical determination of the TST rate constant. The procedure is based on Monte Carlo importance sampling using a tethered chain with links modeled as harmonic springs. The beads of the chain and the points at which links pierce the dividing surface separating states serve as biased sampling points for Monte Carlo numerical integration. The methods presented here are tested using the Muller potential surface. The application to problems involving transitions between clusters of states, i.e., macrostates, is discussed. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,CTR ADV MAT,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM ENGN,BERKELEY,CA 94720. RI Sevick, Edith /I-8029-2014; OI Sevick, Edith /0000-0003-4857-0523; Bell, Alexis/0000-0002-5738-4645 NR 26 TC 58 Z9 58 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1993 VL 98 IS 4 BP 3196 EP 3212 DI 10.1063/1.464093 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KP938 UT WOS:A1993KP93800070 ER PT J AU BLUSH, JA CHEN, P WIEDMANN, RT WHITE, MG AF BLUSH, JA CHEN, P WIEDMANN, RT WHITE, MG TI ROTATIONALLY RESOLVED THRESHOLD PHOTOELECTRON-SPECTRUM OF THE METHYL RADICAL SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID SPECTROSCOPY; RESOLUTION; ENERGY; BAND; PHOTOIONIZATION; CATION AB We report the rotationally resolved, one-photon threshold photoelectron spectrum of the methyl radical, CH3, produced by supersonic-jet, flash pyrolysis. Only rotational transitions with DELTAK = 0, +/- 2 are observed and this result is shown to be consistent with photoionization selection rules in D3h Symmetry. Assignment of the threshold photoelectron spectrum results in an adiabatic ionization potential of 79 349 +/- 3 cm-1. C1 BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973. RP BLUSH, JA (reprint author), HARVARD UNIV,MALLINCKRODT CHEM LAB,CAMBRIDGE,MA 02138, USA. RI Chen, Peter/L-5824-2016 NR 25 TC 97 Z9 97 U1 1 U2 10 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1993 VL 98 IS 4 BP 3557 EP 3559 DI 10.1063/1.464077 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KP938 UT WOS:A1993KP93800109 ER PT J AU COLUMBIA, MR CRABTREE, AM THIEL, PA AF COLUMBIA, MR CRABTREE, AM THIEL, PA TI EFFECT OF CO ON PT-CATALYZED DECOMPOSITION OF FORMIC-ACID IN ULTRAHIGH-VACUUM SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID PLATINUM-ELECTRODE; AD-ATOMS; OXIDATION; PT(111); SPECTROSCOPY; ELECTROCATALYSIS; ADSORPTION; MECHANISM; METHANOL; SURFACE AB Previous work has established that Pt(111) catalyzes the decomposition of formic acid via a formate intermediate, ultimately yielding CO2 and H-2 as gas-phase products in the environment of ultrahigh vacuum. In this work, we describe the effect of CO, which is a known poison in the electrochemical oxidation of formic acid at Pt surfaces. We find that CO exerts two main effects. First, it prevents conversion of molecular acid to the formate intermediate and promotes desorption of the molecular acid, both as monomers and oligomers. Presumably this is due to blocking of sites necessary to accommodate the dissociation products. Second, CO promotes a new but minor decomposition pathway by which up to 0.04 monolayers of the acid reacts. These results are compared with the electrochemical literature. C1 IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,AMES,IA 50011. RP COLUMBIA, MR (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011, USA. NR 29 TC 13 Z9 13 U1 2 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD FEB 15 PY 1993 VL 345 IS 1-2 BP 93 EP 105 DI 10.1016/0022-0728(93)80471-S PG 13 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA KP533 UT WOS:A1993KP53300007 ER PT J AU FRYDMAN, L HARWOOD, JS GARNIER, DN CHINGAS, GC AF FRYDMAN, L HARWOOD, JS GARNIER, DN CHINGAS, GC TI POSITION DISPLACEMENT CORRELATIONS IN FLUIDS FROM MAGNETIC-RESONANCE GRADIENT-ECHO SHAPES SO JOURNAL OF MAGNETIC RESONANCE SERIES A LA English DT Article ID NMR MICROSCOPY; SPIN-ECHO; DIFFUSION; VELOCITY; SPACE; FLOW C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. NR 32 TC 14 Z9 14 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 1064-1858 J9 J MAGN RESON SER A JI J. Magn. Reson. Ser. A PD FEB 15 PY 1993 VL 101 IS 3 BP 240 EP 248 DI 10.1006/jmra.1993.1039 PG 9 WC Physics, Atomic, Molecular & Chemical SC Physics GA KW230 UT WOS:A1993KW23000002 ER PT J AU GALLAGHER, KP ZHANG, X RUNT, JP HUYNHBA, G LIN, JS AF GALLAGHER, KP ZHANG, X RUNT, JP HUYNHBA, G LIN, JS TI MISCIBILITY AND COCRYSTALLIZATION IN HOMOPOLYMER SEGMENTED BLOCK COPOLYMER BLENDS SO MACROMOLECULES LA English DT Article ID ANNEALED POLY(BUTYLENE TEREPHTHALATE); CRYSTALLIZATION BEHAVIOR; POLYETHYLENE AB The amorphous phase behavior of blends of poly(butylene terephthalate) (PBT) and poly-(ester-ether) segmented block copolymers (PEE) was found to vary from completely immiscible to miscible, depending on the copolymer composition. The predictions of the Flory-Huggins relationship are in general agreement with the observed behavior when the interaction parameters are estimated from solubility parameters. The results of thermal analysis and small-angle X-ray scattering experiments strongly suggest that the PBT and PEE copolymers are capable of cocrystallization in the miscible blends under all crystallization conditions. The cocrystalline microstructure results from the complete miscibility and the blocky nature of the copolymer (i.e., the identical chemical and crystalline structures of the PEE hard segments and PBT). The crystallization rate of the copolymer in the miscible blends was found to be significantly enhanced due to the presence of PBT, and the resulting crystal thickness was found to be the same as that observed for PBT. Partially miscible blends of PBT with copolymers containing intermediate hard-segment concentrations formed distinguishable crystal populations, but the crystallization rate of the copolymer in these blends was also strongly influenced by the presence of PBT. C1 PENN STATE UNIV,DEPT MAT SCI & ENGN,POLYMER SCI PROGRAM,UNIV PK,PA 16802. DUPONT CO,DIV RES & DEV,WILMINGTON,DE 19880. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RI He, Yong/F-8752-2012 NR 36 TC 28 Z9 28 U1 2 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD FEB 15 PY 1993 VL 26 IS 4 BP 588 EP 596 DI 10.1021/ma00056a006 PG 9 WC Polymer Science SC Polymer Science GA KM623 UT WOS:A1993KM62300006 ER PT J AU AIHARA, H ARTHUR, AA DAHL, OI EBERHARD, PH EDWARDS, WR FULTON, RL HAUGHIAN, JM MADARAS, RJ ROE, NA SHUMAN, DB SPADAFORA, AL STEVENSON, ML TAYLOR, JD WENZEL, WA CHEN, J CRETSINGER, C FORDEN, GE MILDER, A RUTHERFOORD, J SHUPE, M FEATHERLY, J GIBBARD, BG GORDON, HA GUIDA, JM GURYN, W KAHN, S PROTOPOPESCU, S CUTTS, D NESIC, D HOFTUN, JS FRANZINI, P TUTS, PM AMOS, N BARTLETT, F BHAT, P CHRISTENSON, JH COOPER, WE DIXON, R FISK, HE FUESS, S GRAF, N HAGGERTY, H ITO, AS JONCKHEERE, A KLIMA, B LIPTON, R MERRITT, W PROSPER, H PERYSHKIN, A RAJA, R SMITH, RP STEWART, D TARTAGLIA, M WHITE, AP WOLF, Z AVELLANEDA, R DHARMARATNA, W GOFORTH, M MADDEN, R PIEKARZ, H WAHL, HD WOMERSLEY, J XU, J HADLEY, N NORMAN, D STREETS, K DE, K NEAL, H ABOLINS, M EDMUNDS, D OWEN, DP PI, B WEERTS, H XIA, Y KOTCHER, J KOURLAS, J NEMETHY, P SCULLI, J ZHU, Q BLAZEY, GC BORDERS, J DRAPER, P DURSTON, S FERBEL, T HIROSKY, R LOBKOWICZ, F DEMARTEAU, M GRANNIS, PD GUIDA, JA KARSH, W MARX, M RASMUSSEN, L SCHAMBERGER, RD AF AIHARA, H ARTHUR, AA DAHL, OI EBERHARD, PH EDWARDS, WR FULTON, RL HAUGHIAN, JM MADARAS, RJ ROE, NA SHUMAN, DB SPADAFORA, AL STEVENSON, ML TAYLOR, JD WENZEL, WA CHEN, J CRETSINGER, C FORDEN, GE MILDER, A RUTHERFOORD, J SHUPE, M FEATHERLY, J GIBBARD, BG GORDON, HA GUIDA, JM GURYN, W KAHN, S PROTOPOPESCU, S CUTTS, D NESIC, D HOFTUN, JS FRANZINI, P TUTS, PM AMOS, N BARTLETT, F BHAT, P CHRISTENSON, JH COOPER, WE DIXON, R FISK, HE FUESS, S GRAF, N HAGGERTY, H ITO, AS JONCKHEERE, A KLIMA, B LIPTON, R MERRITT, W PROSPER, H PERYSHKIN, A RAJA, R SMITH, RP STEWART, D TARTAGLIA, M WHITE, AP WOLF, Z AVELLANEDA, R DHARMARATNA, W GOFORTH, M MADDEN, R PIEKARZ, H WAHL, HD WOMERSLEY, J XU, J HADLEY, N NORMAN, D STREETS, K DE, K NEAL, H ABOLINS, M EDMUNDS, D OWEN, DP PI, B WEERTS, H XIA, Y KOTCHER, J KOURLAS, J NEMETHY, P SCULLI, J ZHU, Q BLAZEY, GC BORDERS, J DRAPER, P DURSTON, S FERBEL, T HIROSKY, R LOBKOWICZ, F DEMARTEAU, M GRANNIS, PD GUIDA, JA KARSH, W MARX, M RASMUSSEN, L SCHAMBERGER, RD TI DESIGN, CONSTRUCTION, AND PERFORMANCE OF THE ELECTROMAGNETIC MODULE OF THE D0 END CALORIMETER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID URANIUM AB The two End Calorimeter Electromagnetic (ECEM) modules of the D0 liquid argon calorimeter system have been constructed as monolithic units of 1 m radius to provide full azimuthal coverage in the forward and backward regions (1.4 < \eta\ < 4.0) for the study of ppBAR collisions at the Fermilab Tevatron Collider. An ECEM module consists of 18 layers of absorber disks (mostly 4 mm thick uranium) with interleaved signal disks that have readout pads in semi-projective towers. The mechanical design and construction of the ECEM modules is described in detail. The performance of one ECEM module has been studied in beam tests with electrons. Results are given for the linearity and uniformity of response, the energy and position resolutions, and pion rejection. C1 UNIV ARIZONA,TUCSON,AZ 85721. BROOKHAVEN NATL LAB,UPTON,NY 11973. BROWN UNIV,PROVIDENCE,RI 02912. COLUMBIA UNIV,NEW YORK,NY 10027. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV FLORIDA,GAINESVILLE,FL 32611. FLORIDA STATE UNIV,TALLAHASSEE,FL 32306. UNIV MARYLAND,COLL PK,MD 20742. UNIV MICHIGAN,ANN ARBOR,MI 48109. UNIV ROCHESTER,ROCHESTER,NY 14627. NYU,NEW YORK,NY 10003. MICHIGAN STATE UNIV,E LANSING,MI 48824. SUNY STONY BROOK,STONY BROOK,NY 11794. RP AIHARA, H (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Aihara, Hiroaki/F-3854-2010; Roe, Natalie/A-8798-2012; De, Kaushik/N-1953-2013 OI Aihara, Hiroaki/0000-0002-1907-5964; De, Kaushik/0000-0002-5647-4489 NR 17 TC 17 Z9 17 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 FEB 15 PY 1993 VL 325 IS 3 BP 393 EP 416 DI 10.1016/0168-9002(93)90385-U PG 24 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KL649 UT WOS:A1993KL64900004 ER PT J AU STANTON, M PHILLIPS, WC OMARA, D NADAY, I WESTBROOK, E AF STANTON, M PHILLIPS, WC OMARA, D NADAY, I WESTBROOK, E TI AREA DETECTOR DESIGN .2. APPLICATION TO A MODULAR CCD-BASED DETECTOR FOR X-RAY CRYSTALLOGRAPHY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB The performance of laboratory and synchrotron CCD-based detectors for X-ray crystallography is modeled using expressions which describe both the detector and the experiment. The detectors are constructed from an array of identical modules, each module consisting of a phosphor X-ray-to-light convertor, a fiberoptic taper and a CCD. The performance is characterized by the detective quantum efficiency (DOE) and dynamic range (DR), and by four additional expressions; the detective collective efficiency (DCE), experimental detective quantum efficiency (XDQE), experimental detective collection efficiency (XDCE) and experimental dynamic range (XDR). These additional expressions provide a means for including experimental constraints in the design of the detector. For a crystallography detector, these constraints include the requirements that the detector a) integrate Bragg peaks to maximum precision, and b) efficiently collect data to high resolution (large Bragg angle. Results obtained using these expressions demonstrate the need for a detector with a relatively large area. In order to build a such a detector from a reasonable number of modules using currently available fiberoptic tapers and CCDs, tapers with a demagnification ratio of > 3 : 1 are required. A different conclusion would be arrived at if the DQE alone were considered, demonstrating the importance of this method. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. RP STANTON, M (reprint author), BRANDEIS UNIV,ROSENSTIEL BASIC MED SCI RES CTR,WALTHAM,MA 02254, USA. NR 8 TC 25 Z9 25 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 FEB 15 PY 1993 VL 325 IS 3 BP 558 EP 567 DI 10.1016/0168-9002(93)90405-7 PG 10 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA KL649 UT WOS:A1993KL64900024 ER PT J AU SUNDRUM, R HSU, SDH AF SUNDRUM, R HSU, SDH TI WALKING TECHNICOLOR AND ELECTROWEAK RADIATIVE-CORRECTIONS SO NUCLEAR PHYSICS B LA English DT Article ID EXTENDED TECHNICOLOR; PARAMETERS; QCD; COUPLINGS; BREAKING; MASS AB We examine the effect of walking technicolor dynamics on the electroweak S-parameter and contrast it with the effect of QCD-like technicolor dynamics. Our main tools are the operator product expansion for the high-momentum behavior of the electroweak gauge boson vacuum polarizations and the analyticity of these polarizations which relate their low and high momentum behaviors. We show that whereas in large QCD-like technicolor models S is large and positive, in walking technicolor models a negative contribution is emphasized, related to the large anomalous dimension of the technifermion condensate. Thus in walking technicolor S is determined by a large cancellation of two competing effects. This may result in much smaller values of S than in QCD-like technicolor, although considerable uncertainties are involved. We conclude that it is impossible to rule out walking technicolor based on the present experimental limits on S and the present theoretical technology. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. HARVARD UNIV,LYMAN LAB PHYS,CAMBRIDGE,MA 02138. RP SUNDRUM, R (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. NR 29 TC 99 Z9 99 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 FEB 15 PY 1993 VL 391 IS 1-2 BP 127 EP 146 DI 10.1016/0550-3213(93)90144-E PG 20 WC Physics, Particles & Fields SC Physics GA KT587 UT WOS:A1993KT58700007 ER PT J AU BENMENAHEM, S AF BENMENAHEM, S TI D=0 MATRIX MODEL AS CONJUGATE FIELD-THEORY SO NUCLEAR PHYSICS B LA English DT Article ID 2-DIMENSIONAL QUANTUM-GRAVITY; 1 STRING THEORY; RANDOM SURFACES; NONPERTURBATIVE SOLUTION; CRITICAL-BEHAVIOR; CONFORMAL GAUGE; CLOSED STRINGS; ONE-DIMENSION; 2D; 2-POINT AB The D = 0 matrix model is reformulated as a nonlocal quantum field theory in two dimensions, in which the interactions occur on the one-dimensional line of hermitian matrix eigenvalues. The field can be thought of as a fluctuation in the potential V, and is conjugate to the density of matrix eigenvalues which appears in the Jevicki collective field theory. The classical solution of the field equation is either unique or labeled by a discrete index. Such a solution corresponds to the Dyson sea modified by a entropy term. The modification smoothes the sea edges, and interpolates between different eigenvalue bands for multiple-well potentials. Our classical eigenvalue density contains nonplanar effects. and satisfies a local nonlinear Schrodinger equation with similarities to the fifth-time D = 1 reformulation. The quantum fluctuations about a classical solution are computable, and the IR and UV divergences are manifestly removed to all orders. The quantum corrections greatly simplify in the double-scaling limit, and include both string-perturbative and nonperturbative effects. The latter are unambiguous for V bounded from below. and even for k = 2 can be compared with the various nonperturbative definitions of these theories proposed in the literature. The entire double-scaled, string-perturbative series for the free energy resides in two terms: the classical term, plus the one-loop (semiclassical) functional determinant about the classical solution. RP BENMENAHEM, S (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 49 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 FEB 15 PY 1993 VL 391 IS 1-2 BP 176 EP 210 DI 10.1016/0550-3213(93)90146-G PG 35 WC Physics, Particles & Fields SC Physics GA KT587 UT WOS:A1993KT58700009 ER PT J AU TSANG, T AF TSANG, T TI OBSERVATION OF HIGH-ORDER SOLITONS FROM A MODE-LOCKED TI-SAPPHIRE LASER SO OPTICS LETTERS LA English DT Article ID RING DYE-LASER; OPTICAL FIBERS; PULSE AB I report the observation of high-order solitonlike femtosecond pulses directly generated in an absorber jet-induced self-mode-locked Ti:sapphire laser. A soliton period of approximately 1 MHz was observed with a nearly linear dependence on the intracavity dispersion. RP TSANG, T (reprint author), BROOKHAVEN NATL LAB,UPTON,NY 11973, USA. NR 9 TC 14 Z9 16 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 FEB 15 PY 1993 VL 18 IS 4 BP 293 EP 295 DI 10.1364/OL.18.000293 PG 3 WC Optics SC Optics GA KK808 UT WOS:A1993KK80800013 PM 19802114 ER PT J AU CEDER, G DREYSSE, H DEFONTAINE, D AF CEDER, G DREYSSE, H DEFONTAINE, D TI TRIPLET INTERACTIONS AND THE C(2X2) OVERLAYER PHASE-DIAGRAM SO PHYSICA A LA English DT Article ID EFFECTIVE CLUSTER INTERACTIONS; VARIATION FORMALISM; METAL-SURFACES; HYDROGEN; ADSORPTION; PD(100) AB Square lattice phase diagrams are investigated with the extended Ising model, considering pair and triplet interactions. We determine the stability of the c(2 x 2) structure as a function of different triplet interactions. A systematical study of the asymmetry of the phase diagram shows that the triplet interactions with two nnn bounds play a major role in producing an asymmetric phase diagram. The experimental phase diagram of hydrogen adsorbed on a Pd (001) surface is discussed within this framework. C1 UNIV NANCY 1,PHYS SOLIDE LAB,CNRS,URA DO155,F-54506 VANDOEUVRE NANCY,FRANCE. LAWRENCE BERKELEY LAB,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720. RP CEDER, G (reprint author), MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139, USA. NR 22 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD FEB 15 PY 1993 VL 193 IS 1 BP 105 EP 113 DI 10.1016/0378-4371(93)90217-R PG 9 WC Physics, Multidisciplinary SC Physics GA KN857 UT WOS:A1993KN85700005 ER PT J AU SHI, X TANG, D HESKETT, D TSUEI, KD ISHIDA, H MORIKAWA, Y TERAKURA, K AF SHI, X TANG, D HESKETT, D TSUEI, KD ISHIDA, H MORIKAWA, Y TERAKURA, K TI COVERAGE-DEPENDENT CORE-LEVEL BINDING-ENERGY SHIFTS OF ALKALI-METAL ATOMS ON METAL-SURFACES SO PHYSICAL REVIEW B LA English DT Note ID ELECTRONIC-STRUCTURE; POTASSIUM; ADSORPTION; CS; PSEUDOPOTENTIALS; CHEMISORPTION; TRANSITION; OVERLAYERS; NA AB Coverage-dependent core-level binding energies of the Na 2p level of Na adsorbed on Cu(111) and Ni(111) surfaces are measured and compared to a first-principles calculation of Na on jellium. Similar behavior of the Na 2p level for both Cu and Ni suggests a substrate-independent core-level shift mechanism. The result of a local-density-functional calculation of the electrostatic potential-energy change as a function of alkali-metal coverage allows us to separate out the contributions of initial- and final-state effects in the coverage dependence of alkali-metal core-level binding-energy shifts. C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. UNIV TOKYO, INST SOLID STATE PHYS, TOKYO 106, JAPAN. RP UNIV RHODE ISL, DEPT PHYS, KINGSTON, RI 02881 USA. RI Morikawa, Yoshitada/B-8257-2012 NR 25 TC 23 Z9 23 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 7 BP 4014 EP 4017 DI 10.1103/PhysRevB.47.4014 PG 4 WC Physics, Condensed Matter SC Physics GA KP086 UT WOS:A1993KP08600076 ER PT J AU HORNER, GS MASCARENHAS, A FROYEN, S ALONSO, RG BERTNESS, K OLSON, JM AF HORNER, GS MASCARENHAS, A FROYEN, S ALONSO, RG BERTNESS, K OLSON, JM TI PHOTOLUMINESCENCE-EXCITATION-SPECTROSCOPY STUDIES IN SPONTANEOUSLY ORDERED GAINP2 SO PHYSICAL REVIEW B LA English DT Note AB We present results of an experimental study of the optical properties of spontaneously ordered GaInP2 using the techniques of low-temperature polarized photoluminescence and polarized photoluminescence excitation spectroscopy. Highly ordered samples are seen to have an absorption edge which is softer, more polarization dependent, and blueshifted farther from the PL peak than less-ordered samples. The data provide evidence for a statistical distribution of domains having different order parameters in epitaxial films of GaInP2. RP HORNER, GS (reprint author), NATL RENEWABLE ENERGY LAB,GOLDEN,CO 80401, USA. NR 9 TC 50 Z9 50 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 FEB 15 PY 1993 VL 47 IS 7 BP 4041 EP 4043 DI 10.1103/PhysRevB.47.4041 PG 3 WC Physics, Condensed Matter SC Physics GA KP086 UT WOS:A1993KP08600083 ER PT J AU DRESZER, P CHEN, WM SEENDRIPU, K WOLK, JA WALUKIEWICZ, W LIANG, BW TU, CW WEBER, ER AF DRESZER, P CHEN, WM SEENDRIPU, K WOLK, JA WALUKIEWICZ, W LIANG, BW TU, CW WEBER, ER TI PHOSPHORUS ANTISITE DEFECTS IN LOW-TEMPERATURE INP SO PHYSICAL REVIEW B LA English DT Note ID DETECTED MAGNETIC-RESONANCE; DX CENTERS; PRESSURE; ABSORPTION; GAAS AB We have studied low-temperature molecular-beam-epitaxy-grown InP using a variety of experimental techniques. Hall effect and far-infrared absorption under hydrostatic pressure have been employed to determine the ionization energies of two dominant donor levels at 0.11 eV above and 0.23 eV below the conduction-band GAMMA minimum. Measurements of photoluminescence and optically detected magnetic resonance indicate that those two levels are first and second ionization states of the phosphorus antisite double donor defect. The present results demonstrate that the antisite is a prevalent defect responsible for electrical and optical properties of the nonstochiometric, low-temperature InP. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093. RP DRESZER, P (reprint author), UNIV CALIF BERKELEY,DEPT MAT SCI & MINERAL ENGN,BERKELEY,CA 94720, USA. RI Chen, Weimin/J-4660-2012 OI Chen, Weimin/0000-0002-6405-9509 NR 18 TC 57 Z9 57 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 7 BP 4111 EP 4114 DI 10.1103/PhysRevB.47.4111 PG 4 WC Physics, Condensed Matter SC Physics GA KP086 UT WOS:A1993KP08600101 ER PT J AU TSUEI, KD JOHNSON, PD NORDLANDER, P LANGRETH, DC AF TSUEI, KD JOHNSON, PD NORDLANDER, P LANGRETH, DC TI ANISOTROPIC CHARGE-TRANSFER BETWEEN HYDROGENIC STATES AND A METALLIC SUBSTRATE SO PHYSICAL REVIEW B LA English DT Note ID SURFACES; SCATTERING AB By measuring the angular distribution of photon emission from desorbed excited atoms it is possible to measure the anisotropy in charge-transfer rates between metallic states and the oriented excited states outside of the surface. The measured anisotropy of 2.5 shows excellent agreement with the calculated value of 2.54 and clearly demonstrates that intra-atomic correlation effects must be taken into account when describing charge transfer. C1 RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RICE UNIV,RICE QUANTUM INST,HOUSTON,TX 77251. RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08855. RP TSUEI, KD (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Nordlander, Peter/A-2560-2008 OI Nordlander, Peter/0000-0002-1633-2937 NR 11 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 FEB 15 PY 1993 VL 47 IS 7 BP 4142 EP 4145 DI 10.1103/PhysRevB.47.4142 PG 4 WC Physics, Condensed Matter SC Physics GA KP086 UT WOS:A1993KP08600109 ER PT J AU WANG, XD ZHANG, XG YU, QL HARMON, BN AF WANG, XD ZHANG, XG YU, QL HARMON, BN TI MULTIPLE-SCATTERING THEORY FOR ELECTROMAGNETIC-WAVES SO PHYSICAL REVIEW B LA English DT Article ID COHERENT-POTENTIAL APPROXIMATION; PERIODIC DIELECTRIC STRUCTURES; PROPAGATION; SPHERES AB In this paper, a multiple-scattering formalism for electromagnetic waves is presented. Its application to the three-dimensional periodic dielectric structures is given in a form similar to the usual Korringa-Kohn-Rostoker form of scalar waves. Using this approach, the band-structure results of touching spheres of diamond structure in a dielectric medium with dielectric constant 12.96 are calculated. The application to disordered systems under the coherent-potential approximation is discussed. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS,AMES,IA 50011. UNIV KENTUCKY,CTR COMPUTAT SCI,LEXINGTON,KY 40546. RP WANG, XD (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 22 TC 109 Z9 116 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 8 BP 4161 EP 4167 DI 10.1103/PhysRevB.47.4161 PG 7 WC Physics, Condensed Matter SC Physics GA KQ098 UT WOS:A1993KQ09800001 ER PT J AU GULACSI, Z GULACSI, M JANKO, B AF GULACSI, Z GULACSI, M JANKO, B TI HIGH-ORDER PERTURBATION EXPANSION FOR THE 2-DIMENSIONAL HUBBARD-MODEL USING THE GUTZWILLER WAVE-FUNCTION SO PHYSICAL REVIEW B LA English DT Article ID CORRELATED LATTICE FERMIONS; FALICOV-KIMBALL MODEL; HIGH DIMENSIONS; GROUND-STATE; VARIATIONAL EVALUATION; THERMODYNAMICS; ELECTRONS; POLYACETYLENE; SYSTEMS; CHAIN AB A variational approach of the two-dimensional Hubbard model is presented, based on the Gutzwiller wave function, making no use of the Gutzwiller approximation. We calculated exactly the coefficients of the (g2-1)m expansion of the ground-state energy (g is the Gutzwiller variational parameter) up to the m = 8 order. The m > 8 terms were deduced with an acuracy O[(n/2)18] as a function of the electron concentration n. Double occupancy, expectation value of the interaction energy, average kinetic energy, and the minimized ground-state energy are determined and their electron concentration and dimensionality dependence are discussed. An evaluation of the nonanalyticities for any dimension is also presented. C1 RHEIN WESTFAL TH AACHEN,INST THEORET PHYS C,W-5100 AACHEN,GERMANY. LOS ALAMOS NATL LAB,DIV THEORY,LOS ALAMOS,NM 87545. CORNELL UNIV,DEPT PHYS,ITHACA,NY 14853. RI Gulacsi, Zsolt/A-3829-2013; OI Gulacsi, Zsolt/0000-0002-2349-7166 NR 51 TC 11 Z9 11 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 8 BP 4168 EP 4173 DI 10.1103/PhysRevB.47.4168 PG 6 WC Physics, Condensed Matter SC Physics GA KQ098 UT WOS:A1993KQ09800002 ER PT J AU GARCIA, A COHEN, ML AF GARCIA, A COHEN, ML TI 1ST-PRINCIPLES IONICITY SCALES .1. CHARGE ASYMMETRY IN THE SOLID-STATE SO PHYSICAL REVIEW B LA English DT Article ID HIGH-PRESSURE PHASE; ROCK-SALT-TYPE; ALUMINUM NITRIDE; PSEUDOPOTENTIALS; SEMICONDUCTORS; TRANSITION; BAS AB Using a measure of the asymmetry of the valence charge distribution in A(N)B8- C1 UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. RI Garcia, Alberto/A-7460-2008 OI Garcia, Alberto/0000-0001-5138-9579 NR 28 TC 211 Z9 214 U1 2 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 8 BP 4215 EP 4221 DI 10.1103/PhysRevB.47.4215 PG 7 WC Physics, Condensed Matter SC Physics GA KQ098 UT WOS:A1993KQ09800008 ER PT J AU GARCIA, A COHEN, ML AF GARCIA, A COHEN, ML TI 1ST-PRINCIPLES IONICITY SCALES .2. STRUCTURAL COORDINATES FROM ATOMIC CALCULATIONS SO PHYSICAL REVIEW B LA English DT Article ID NONLOCAL-PSEUDOPOTENTIAL APPROACH; DENSITY-FUNCTIONAL FORMALISM; ORBITAL-RADII AB Estimates of atomic size and electronegativity are obtained directly from first-principles calculations of the atomic valence electronic charge density. Significant information about the bonding in the solid state is extracted from the computed atomic parameters, and a first-principles mapping to the semiempirical Pauling ionicity scale is presented. C1 LAWRENCE BERKELEY LAB, DIV MAT SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT PHYS, BERKELEY, CA 94720 USA. RI Garcia, Alberto/A-7460-2008 OI Garcia, Alberto/0000-0001-5138-9579 NR 18 TC 44 Z9 44 U1 1 U2 4 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 FEB 15 PY 1993 VL 47 IS 8 BP 4221 EP 4225 DI 10.1103/PhysRevB.47.4221 PG 5 WC Physics, Condensed Matter SC Physics GA KQ098 UT WOS:A1993KQ09800009 ER PT J AU HEMSTREET, LA FONG, CY NELSON, JS AF HEMSTREET, LA FONG, CY NELSON, JS TI 1ST-PRINCIPLES CALCULATIONS OF SPIN-ORBIT SPLITTINGS IN SOLIDS USING NONLOCAL SEPARABLE PSEUDOPOTENTIALS SO PHYSICAL REVIEW B LA English DT Article ID NORM-CONSERVING PSEUDOPOTENTIALS; SEMICONDUCTORS AB We have extended the considerable computational advantages of separable, nonlocal pseudopotentials to the calculation of spin-orbit splittings in solids. We write the total ionic pseudopotential as a sum of scalar relativistic and spin-orbit contributions, where each term can be represented by a fully nonlocal potential of the separable Kleinman-Bylander (KB) form. The scalar term, which reduces to the standard KB expression for the pseudopotential in the limit where one can neglect spin-orbit interactions, is used in the local-density approximation to calculate zeroth-order electronic properties in the usual way, and spin-orbit splittings are calculated to first order using perturbation theory. We have tested our procedure by calculating the spin-orbit splittings at high symmetry points of the zinc-blende III-V semiconductors GaAs, InAs, AlSb, GaSb, and InSb. The calculated splittings in all cases are in excellent agreement with those obtained from other first-principles calculations and with experiment. Since our spin-orbit operator is fully nonlocal in both radial and angular coordinates, a considerable reduction in the labor required to calculate matrix elements has been achieved. This makes our approach ideally suited for use with ab initio molecular-dynamics techniques, which currently have become the methods of choice for exploring the electronic and structural properties of solids. C1 UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 18 TC 26 Z9 26 U1 1 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 8 BP 4238 EP 4243 DI 10.1103/PhysRevB.47.4238 PG 6 WC Physics, Condensed Matter SC Physics GA KQ098 UT WOS:A1993KQ09800011 ER PT J AU WU, ZC ARAKAWA, ET JIMENEZ, JR SCHOWALTER, LJ AF WU, ZC ARAKAWA, ET JIMENEZ, JR SCHOWALTER, LJ TI OPTICAL-PROPERTIES OF EPITAXIAL COSI2 ON SI FROM 0.062 TO 22.3 EV SO PHYSICAL REVIEW B LA English DT Article ID FILMS; SILICON; SI(001); NISI2 AB The optical constants of epitaxial CoSi2 filMS On Si from 0.062 to 22.3 eV have been determined by ellipsometry and reflectance measurements. The energy dependencies of the dielectric functions show Drude behavior at energies lower than approximately 0.2 eV with Drude parameters homega(p)BAR=(5.8+/-0.2) eV and hBAR/tau=(0.09+/-0.02) eV. The energy-loss function, calculated from the optical constants, shows two peaks that correspond to the screened plasma oscillation and volume plasma oscillation of all valence electrons. Using the measured optical constants, a composite thin film of epitaxial CoSi2 particles embedded in Si is shown to have the absorptance peak due to a surface-plasmon resonance in the CoSi2 particles. The peak shifts to higher energy as the ellipsoidal particles become more elongated, in good agreement with recent observations by Fathauer et al. [Phys. Rev. B 44, 1345 (1991)]. C1 RENSSELAER POLYTECH INST,DEPT PHYS,TROY,NY 12181. RENSSELAER POLYTECH INST,CTR INTEGRATED ELECTR,TROY,NY 12181. RP WU, ZC (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,OAK RIDGE,TN 37831, USA. NR 25 TC 6 Z9 6 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 8 BP 4356 EP 4362 DI 10.1103/PhysRevB.47.4356 PG 7 WC Physics, Condensed Matter SC Physics GA KQ098 UT WOS:A1993KQ09800026 ER PT J AU SAMARA, GA HANSEN, LV ASSINK, RA MOROSIN, B SCHIRBER, JE LOY, D AF SAMARA, GA HANSEN, LV ASSINK, RA MOROSIN, B SCHIRBER, JE LOY, D TI EFFECTS OF PRESSURE AND AMBIENT SPECIES ON THE ORIENTATIONAL ORDERING IN SOLID C60 SO PHYSICAL REVIEW B LA English DT Article ID PHASE-TRANSITION; DEPENDENCE AB The effects of hydrostatic pressure on the orientational ordering transition in solid C60 were investigated using helium, nitrogen, and a 50/50 (by volume) mixture of normal and isopentanes as pressure-transmitting media. The different observed responses in these media and for different samples, as well as some irreversible pressure cycling effects, have provided much insight into the ordering process. Highlights of the work include the following: (1) Lattice compression hinders the librational motion of the C60 molecules in the low-temperature simple cubic (sc) phase, thereby increasing T(c) and stabilizing the sc phase; the effect is large; (2) the pressure dependence of T(c), along with the accurately known volume change at the transition, yield 1.7 kcal/mole and 6.5 cal/K mole for the latent heat and discontinuous change in entropy, respectively, associated with the transition; (3) T(c) and its pressure dependence are influenced by the presence of ambient species in the interstitial lattice sites. Helium appears to diffuse readily into the lattice, whereas N2 (and O2) diffuse less rapidly and occupy octahedral sites; (4) a two-peak structure in differential thermal analysis spectra (also reported in specific-heat measurements) was observed and is believed to be due to the partial occupation of the octahedral sites by species such as N2 or O2; (5) solid C60 ''reacts'' with pentane at pressures greater-than-or-equal-to 14 kbar and temperatures > 475 K to yield an irreversible C60/pentane complex similar to that obtained by the cocrystallization of C60 and normal pentane at 1 bar. These results are discussed in terms of proposed models. RP SAMARA, GA (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. RI Loy, Douglas/D-4847-2009 OI Loy, Douglas/0000-0001-7635-9958 NR 21 TC 114 Z9 115 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 8 BP 4756 EP 4764 DI 10.1103/PhysRevB.47.4756 PG 9 WC Physics, Condensed Matter SC Physics GA KQ098 UT WOS:A1993KQ09800069 ER PT J AU CHAN, CT BOHNEN, KP HO, KM AF CHAN, CT BOHNEN, KP HO, KM TI ACCELERATING THE CONVERGENCE OF FORCE CALCULATIONS IN ELECTRONIC-STRUCTURE COMPUTATIONS SO PHYSICAL REVIEW B LA English DT Note ID MOLECULAR-DYNAMICS; LINEAR COMBINATION; TOTAL-ENERGY; FORMALISM; SOLIDS AB The Hellmann-Feynman forces in local-density-functional calculations are very sensitive to the self-consistency of the charge or the screening potential. This is due to the omission of a correction term that is frequently ignored. This term can be calculated approximately using a very simple ansatz, which is very easy to code and consumes negligible amounts of computer time, and yet can lead to substantial improvement in the convergence of forces with respect to self-consistency. C1 KERNFORSCHUNGSZENTRUM KARLSRUHE GMBH,INST NUKL FESTKORPERPHYS,W-7500 KARLSRUHE 1,GERMANY. IOWA STATE UNIV SCI & TECHNOL,DEPT PHYS & ASTRON,AMES,IA 50011. RP CHAN, CT (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 20 TC 27 Z9 27 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1993 VL 47 IS 8 BP 4771 EP 4774 DI 10.1103/PhysRevB.47.4771 PG 4 WC Physics, Condensed Matter SC Physics GA KQ098 UT WOS:A1993KQ09800071 ER PT J AU HU, BL PAZ, JP ZHANG, YH AF HU, BL PAZ, JP ZHANG, YH TI QUANTUM BROWNIAN-MOTION IN A GENERAL ENVIRONMENT .2. NONLINEAR COUPLING AND PERTURBATIVE APPROACH SO PHYSICAL REVIEW D LA English DT Article ID PATH FUNCTIONAL FORMALISM; BACK-REACTION PROBLEMS; INTEGRAL APPROACH; CURVED SPACETIME; DISSIPATION; DECOHERENCE; TRANSITION; DYNAMICS AB We develop a perturbation scheme to treat the dynamics of a quantum Brownian particle (coordinate x) coupled nonlinearly to a bath of oscillators (coordinates q(n)) with an interaction action in the form lambdaf(x)q(n)k. We derive the influence functionals for the k = 2,3,4 cases to order lambda2 and derive the master equations for the special cases of local dissipation and white noise, as well as the general cases of nonlocal dissipation and colored noise for f(x) = x and x2. We show that a generalized fluctuation-dissipation relation exists between the lth-order noise kernels of the kth-order coupling and their corresponding dissipation kernels. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. US FDA,CBER,BIOPHYS LAB,BETHESDA,MD 20982. RP HU, BL (reprint author), UNIV MARYLAND,DEPT PHYS,COLL PK,MD 20742, USA. RI Paz, Juan/C-5947-2008 NR 57 TC 199 Z9 199 U1 0 U2 7 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 FEB 15 PY 1993 VL 47 IS 4 BP 1576 EP 1594 DI 10.1103/PhysRevD.47.1576 PG 19 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KN182 UT WOS:A1993KN18200036 ER PT J AU AOKI, S GOCKSCH, A SHEN, Y AF AOKI, S GOCKSCH, A SHEN, Y TI STUDY OF THE N = 2 KAZAKOV-MIGDAL MODEL SO PHYSICAL REVIEW D LA English DT Article ID LATTICE GAUGE-THEORY; PHASE-STRUCTURE AB We study numerically the SU(2) Kazakov-Migdal model of ''induced QCD.'' In contrast with our earlier work on the subject we have chosen here not to integrate out the gauge fields but to keep them in the Monte Carlo simulation. This allows us to measure observables associated with the gauge fields, and thereby address the problem of the local Z2 symmetry present in the model. We confirm our previous result that the model has a line of first-order phase transitions terminating in a critical point. The adjoint plaquette has a clear discontinuity across the phase transition, whereas the plaquette in the fundamental representation is always zero in accordance with Elitzur's theorem. The density of small Z2 monopoles shows very little variation and is always large. We also find that the model has extra local U(1) symmetries which do not exist in the case of the standard adjoint theory. As a result, we are able to show that two of the angles parametrizing the gauge field completely decouple from the theory, and the continuum limit defined around the critical point can therefore not be ''QCD.'' C1 BROOKHAVEN NATL LAB, DEPT PHYS, UPTON, NY 11973 USA. RP UNIV TSUKUBA, INST PHYS, TSUKUBA, IBARAKI 305, JAPAN. NR 23 TC 2 Z9 2 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0010 EI 2470-0029 J9 PHYS REV D JI Phys. Rev. D PD FEB 15 PY 1993 VL 47 IS 4 BP 1645 EP 1651 DI 10.1103/PhysRevD.47.1645 PG 7 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KN182 UT WOS:A1993KN18200042 ER PT J AU YEE, K AF YEE, K TI CENTRAL CHARGE OF THE PARALLELOGRAM-LATTICE STRONG COUPLING SCHWINGER MODEL SO PHYSICAL REVIEW D LA English DT Note ID VERTEX AB We put forth a Fierz-transformed hopping expansion for strong coupling Wilson fermions. As an application, we show that the strong coupling Schwinger model on parallelogram lattices with nonbacktracking Wilson fermions span, as a function of the lattice skewness angle, the DELTA = -1 critical line of six-vertex models. This Fierz-transformed formulation also applies to backtracking Wilson fermions, which as we describe apparently correspond to richer systems. However, we have not been able to identify them with exactly solved models. RP YEE, K (reprint author), BROOKHAVEN NATL LAB,PHYS THEORY GRP,UPTON,NY 11973, USA. NR 13 TC 4 Z9 4 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 FEB 15 PY 1993 VL 47 IS 4 BP 1719 EP 1722 DI 10.1103/PhysRevD.47.1719 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KN182 UT WOS:A1993KN18200056 ER PT J AU LUK, KB JAMES, C RAMEIKA, R DIEHL, HT TEIGE, S THOMSON, GB ZOU, Y HO, PM LONGO, MJ NGUYEN, A DURYEA, J GUGLIELMO, G HELLER, K JOHNS, K THORNE, K AF LUK, KB JAMES, C RAMEIKA, R DIEHL, HT TEIGE, S THOMSON, GB ZOU, Y HO, PM LONGO, MJ NGUYEN, A DURYEA, J GUGLIELMO, G HELLER, K JOHNS, K THORNE, K TI POLARIZATION OF OMEGA-HYPERONS PRODUCED IN 800 GEV PROTON-BERYLLIUM COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID MAGNETIC-MOMENT; INCLUSIVE PRODUCTION; PRECISE MEASUREMENT; 800-GEV/C PROTONS; LAMBDA; ASYMMETRY; DECAYS AB The polarization of 103211 OMEGA- hyperons produced in 800 GeV proton-beryllium inclusive reactions has been measured. Between 0.3 < x(F) < 0.7 and 0.5 < p(t) < 1.3 GeV/c, the OMEGA- polarization is found to be consistent with zero, with a mean value of -0.01 +/- 0.01 at [x(F)]-0.5 and [p(t)] = 0.95 GeV/c. This behavior is similar to that of LAMDA0BAR, which also does not have any quarks in common with the incident proton, but is different from XI+BAR, which is significantly polarized in the same kinematic region. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. RUTGERS STATE UNIV,DEPT PHYS & ASTRON,PISCATAWAY,NJ 08854. UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109. UNIV MINNESOTA,SCH PHYS & ASTRON,MINNEAPOLIS,MN 55455. NR 29 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 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 15 PY 1993 VL 70 IS 7 BP 900 EP 903 DI 10.1103/PhysRevLett.70.900 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600007 ER PT J AU BOHN, CL AF BOHN, CL TI TRANSVERSE PHASE-SPACE DYNAMICS OF MISMATCHED CHARGED-PARTICLE BEAMS SO PHYSICAL REVIEW LETTERS LA English DT Article AB The transverse dynamics of a nonrelativistic, mismatched charged-particle beam propagating through a continuous, linear focusing channel is calculated using the Fokker-Planck equation to represent the evolution of a coarse-grained distribution function in the phase space of a single beam particle. The relaxation rate and diffusion coefficient axe determined from a simple model of turbulence resulting from charge redistribution. The solution for the distribution function enables calculation of all transverse beam properties as a function of time, including the halo. RP BOHN, CL (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,ARGONNE,IL 60439, USA. NR 12 TC 18 Z9 18 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 FEB 15 PY 1993 VL 70 IS 7 BP 932 EP 935 DI 10.1103/PhysRevLett.70.932 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600015 ER PT J AU WU, XZ SIROTA, EB SINHA, SK OCKO, BM DEUTSCH, M AF WU, XZ SIROTA, EB SINHA, SK OCKO, BM DEUTSCH, M TI SURFACE CRYSTALLIZATION OF LIQUID NORMAL-ALKANES SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY-DIFFRACTION; CRYSTAL FILMS; LAYER GROWTH; MONOLAYERS; WATER AB X-ray scattering and surface tension measurements reveal the formation of a crystalline monolayer on the surface of liquid n-alkanes at about 3-degrees-C above the bulk solidification temperature. The molecules in the monolayer are hexagonally packed and oriented normal to the surface. The single solid monolayer persists down to the bulk solidification temperature, thus exhibiting a very limited partial wetting. C1 BAR ILAN UNIV,DEPT PHYS,IL-52900 RAMAT GAN,ISRAEL. BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. RP WU, XZ (reprint author), EXXON RES & ENGN CO,CORP RES SCI LAB,ROUTE 22 E,ANNANDALE,NJ 08801, USA. RI Sirota, Eric/A-7633-2009 NR 26 TC 237 Z9 240 U1 0 U2 20 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 15 PY 1993 VL 70 IS 7 BP 958 EP 961 DI 10.1103/PhysRevLett.70.958 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600022 ER PT J AU SUDBO, A VARMA, CM GIAMARCHI, T STECHEL, EB SCALETTAR, RT AF SUDBO, A VARMA, CM GIAMARCHI, T STECHEL, EB SCALETTAR, RT TI FLUX-QUANTIZATION AND PAIRING IN ONE-DIMENSIONAL COPPER-OXIDE MODELS SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXTENDED HUBBARD-MODEL; OPTICAL CONDUCTIVITY; CORRELATION EXPONENTS; SUPERCONDUCTIVITY; SYSTEMS AB We obtain the ground-state energy E0(PHI) exactly as a function of flux PHI in a one-dimensional ''copper-oxide model'' on rings of finite circumference L, including on-site interactions and a nearest-neighbor interaction V. For V of the order of the charge-transfer gap or larger, the model extrapolated to large L exhibits flux quantization with charge 2e, and a slow algebraic decay of the singlet superconducting correlation function on oxygen sites. The extrapolated superfluid stiffness appears, however, finite only for not too large V. These results suggest a superconductive state at V of order the charge-transfer gap of the model, but a paired and phase-separated state at larger V. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP SUDBO, A (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. RI Giamarchi, Thierry/B-5735-2008; Stechel, Ellen/B-1253-2012 OI Giamarchi, Thierry/0000-0001-7409-5071; NR 22 TC 50 Z9 50 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 FEB 15 PY 1993 VL 70 IS 7 BP 978 EP 981 DI 10.1103/PhysRevLett.70.978 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600027 ER PT J AU RALPH, DC RALLS, KS BUHRMAN, RA AF RALPH, DC RALLS, KS BUHRMAN, RA TI ENSEMBLE STUDIES OF NONLINEAR CONDUCTANCE FLUCTUATIONS IN PHASE COHERENT SAMPLES SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM TRANSPORT; POINT-CONTACT; METALS; WIRES; FILMS AB We discuss the voltage dependence of the differential conductance fluctuations in metal samples containing a disordered region much smaller than the inelastic diffusion length at low voltage. Measurements are made for an ensemble of different defect configurations within the same sample. We find that the root mean square amplitude of differential conductance fluctuations within a phase coherent sample is independent of voltage, in conflict with existing theory. The measured voltage correlation scale is at least an order of magnitude smaller than the Thouless energy divided by e. C1 LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA 94550 USA. RP CORNELL UNIV, SCH APPL & ENGN PHYS, ITHACA, NY 14853 USA. RI Ralph, Daniel/G-3251-2010 NR 21 TC 30 Z9 30 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 15 PY 1993 VL 70 IS 7 BP 986 EP 989 DI 10.1103/PhysRevLett.70.986 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600029 ER PT J AU KUNCHUR, MN CHRISTEN, DK PHILLIPS, JM AF KUNCHUR, MN CHRISTEN, DK PHILLIPS, JM TI OBSERVATION OF FREE FLUX FLOW AT HIGH DISSIPATION LEVELS IN YBA2CU3O7-BETA EPITAXIAL-FILMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERCONDUCTORS; FIELD; LAALO3(100); LATTICE AB The total resistivity (rho = E/J, not dE/dJ) was measured in epitaxial YBa2Cu3O7-delta films up to high dissipation levels using a pulsed current source. In the reversible region, rho(J) has an S shape; it is Ohmic at low J (thermally activated free flux motion), goes through a nonlinear transition region (depinning), and becomes Ohmic again at the highest J (free flux flow, i.e., purely viscous motion). The free-flux-flow resistivity rho(fff) obeys rho(fff)/rho(n) congruent-to H/H(c2)(T), with dH(c2)/dT almost-equal-to 2 T/K. C1 AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. RP OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN 37831 USA. RI Christen, David/A-9709-2008 NR 23 TC 78 Z9 78 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 15 PY 1993 VL 70 IS 7 BP 998 EP 1001 DI 10.1103/PhysRevLett.70.998 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600032 ER PT J AU QIU, ZQ PEARSON, J BADER, SD AF QIU, ZQ PEARSON, J BADER, SD TI ASYMMETRY OF THE SPIN REORIENTATION TRANSITION IN ULTRATHIN FE FILMS AND WEDGES GROWN ON AG(100) SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENERGY ELECTRON-DIFFRACTION; MAGNETIC PHASE-TRANSITION; POLARIZED PHOTOEMISSION; FE(100) FILMS; AG(001); OSCILLATIONS; ANISOTROPY; IRON AB Fe(100) films and wedge-shaped overlayers were grown epitaxially onto Ag(100) and investigated in situ by means of the surface magneto-optic Kerr effect. The reversible spin reorientation transition between perpendicular and in-plane alignment at T(R), which is below the Curie temperature T(C), is characterized for critical thicknesses d(R) along the length of a wedge. A similar asymmetry is identified within pseudogap regions in the vicinity of both T(R) and d(R) in which the remanent magnetization is small but nonvanishing. RP QIU, ZQ (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013; Qiu, Zi Qiang/O-4421-2016 OI Qiu, Zi Qiang/0000-0003-0680-0714 NR 23 TC 285 Z9 288 U1 2 U2 17 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 FEB 15 PY 1993 VL 70 IS 7 BP 1006 EP 1009 DI 10.1103/PhysRevLett.70.1006 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600034 ER PT J AU SCHOENLEIN, RW MITTLEMAN, DM SHIANG, JJ ALIVISATOS, AP SHANK, CV AF SCHOENLEIN, RW MITTLEMAN, DM SHIANG, JJ ALIVISATOS, AP SHANK, CV TI INVESTIGATION OF FEMTOSECOND ELECTRONIC DEPHASING IN CDSE NANOCRYSTALS USING QUANTUM-BEAT-SUPPRESSED PHOTON-ECHOES SO PHYSICAL REVIEW LETTERS LA English DT Article ID SEMICONDUCTOR CLUSTERS; SIZE DEPENDENCE; DYNAMICS AB We report the first direct measurements of femtosecond electronic dephasing in CdSe nanocrystals using three-pulse photon echoes and a novel mode-suppression technique. We are able to separate the dynamics of the coherently excited LO phonons from the underlying electron-hole dephasing by suppressing the quantum beats. The homogeneous linewidth of these materials at 15 K results from electronic dephasing in approximately 85 fs, approximately half of which is due to acoustic phonon modes. Contributions from acoustic phonons dominate the homogeneous linewidth at room temperature. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RP SCHOENLEIN, RW (reprint author), LAWRENCE BERKELEY LAB,1 CYCLOTRON RD,MS 70-193A,BERKELEY,CA 94720, USA. RI Schoenlein, Robert/D-1301-2014; Alivisatos , Paul /N-8863-2015 OI Schoenlein, Robert/0000-0002-6066-7566; Alivisatos , Paul /0000-0001-6895-9048 NR 17 TC 153 Z9 153 U1 1 U2 20 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 15 PY 1993 VL 70 IS 7 BP 1014 EP 1017 DI 10.1103/PhysRevLett.70.1014 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600036 ER PT J AU LUCAS, JN SACHS, RK AF LUCAS, JN SACHS, RK TI USING 3-COLOR CHROMOSOME PAINTING TO TEST CHROMOSOME ABERRATION MODELS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE DNA DOUBLE-STRAND BREAKS; IONIZING RADIATION DAMAGE; FLUORESCENCE INSITU HYBRIDIZATION ID HUMAN-LYMPHOCYTES; RADIATION AB Ionizing radiation induces DNA double-strand breaks (DSB), which interact pairwise to produce chromosome aberrations. There have long been two main competing theories of such pairwise DSB-DSB interactions. The ''classical'' theory asserts that an unrepaired DSB makes two ends that separate within the cell nucleus, with each end subsequently able to join any similar (nontelomeric) end. The ''exchange'' theory asserts that at a DSB the chromatin does not separate completely; rather the DSB ends remain associated until repair, or an illegitimate recombination involving another DSB, occurs. The DSB-DSB interaction mechanism was tested by using three-color fluorescence in situ hybridization to paint chromosomes and observe ''three-color triplets'': three broken and misrejoined chromosomes having cyclically permuted colors. We observed 18 ''three-color triplets'' in 2000 cells after 2.25 Gy of gamma-irradiation. On the exchange model in its standard form such three-color triplets cannot occur, so this model is inconsistent with the observations. On the classical model, formalized as a discrete time Markov chain embedded at the transitions of a continuous time Markov chain, the frequency of occurrence of three-color triplets can be computed by Monte Carlo simulations. The number of three-color triplets predicted mathematically by the classical model was found to be slightly larger than the observed number. Thus our data, together with our computer simulations, exclude the standard form of the exchange model but are compatible with the classical model. The results are also compatible with other, more complicated models. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT MATH,BERKELEY,CA 94720. RP LUCAS, JN (reprint author), LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,POB 808,LIVERMORE,CA 94551, USA. NR 23 TC 82 Z9 82 U1 1 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD FEB 15 PY 1993 VL 90 IS 4 BP 1484 EP 1487 DI 10.1073/pnas.90.4.1484 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KM607 UT WOS:A1993KM60700070 PM 8434009 ER PT J AU BENNING, C BEATTY, JT PRINCE, RC SOMERVILLE, CR AF BENNING, C BEATTY, JT PRINCE, RC SOMERVILLE, CR TI THE SULFOLIPID SULFOQUINOVOSYLDIACYLGLYCEROL IS NOT REQUIRED FOR PHOTOSYNTHETIC ELECTRON-TRANSPORT IN RHODOBACTER-SPHAEROIDES BUT ENHANCES GROWTH UNDER PHOSPHATE LIMITATION SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE SQDB-GENE; DIRECTED MUTAGENESIS; PHOTOSYNTHESIS; LIPID ID COMPLEX; GLYCOLIPIDS; CAPSULATUS; BACTERIA; CYTOCHROME-C2; MEMBRANES; MUTANT AB All photosynthetic organisms, with the exception of several species of photosynthetic bacteria, are thought to contain the sulfolipid 6-sulfo-alpha-D-quinovosyldiacylglycerol. The association of this lipid with photosynthetic membranes has led to the assumption that it plays some role in photosynthesis. Stable null mutants of the photosynthetic bacterium Rhodobacter sphaeroides completely lacking sulfolipid were obtained by disruption of the sqdB gene. The ratios of the various components of the photosynthetic electron transport chain, as well as the electron transfer rates during cyclic electron transport, were not altered in the mutants, when grown under optimal conditions. Growth rates of wild type and mutants were identical under a variety of growth conditions, with the exception of phosphate limitation, which resulted in reduced growth of the mutants. Phosphate limitation of the wild type caused a significant reduction in the amount of all phospholipids and an increased amount of sulfolipid. By contrast, the sulfolipid-deficient mutant had reduced levels of phosphatidylcholine and phosphatidylethanolamine but maintained a normal level of phosphatidylglycerol. In addition, two unidentified lipids lacking phosphorus accumulated in the membranes of both wild-type and mutant strains under phosphate limitation. We conclude that sulfolipid plays no significant unique role in photoheterotrophic growth or photosynthetic electron transport in R. sphaeroides but may function as a surrogate for phospholipids, particularly phosphatidylglycerol, under phosphate-limiting conditions. C1 MICHIGAN STATE UNIV, US DOE, PLANT RES LAB, ROOM 300, 6174 UNIV BLVD, E LANSING, MI 48824 USA. EXXON RES & ENGN CO, ANNANDALE, NJ 08801 USA. UNIV BRITISH COLUMBIA, DEPT MICROBIOL, VANCOUVER V6T 1Z3, BC, CANADA. UNIV BRITISH COLUMBIA, DEPT MED GENET, VANCOUVER V6T 1Z3, BC, CANADA. RI Somerville, Christopher/A-4048-2009 OI Somerville, Christopher/0000-0003-4647-0094 NR 34 TC 113 Z9 125 U1 2 U2 7 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD FEB 15 PY 1993 VL 90 IS 4 BP 1561 EP 1565 DI 10.1073/pnas.90.4.1561 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KM607 UT WOS:A1993KM60700086 PM 8434018 ER PT J AU DAS, S MISHURDA, JC ALLEN, WP PEREPEZKO, JH CHUMBLEY, LS AF DAS, S MISHURDA, JC ALLEN, WP PEREPEZKO, JH CHUMBLEY, LS TI DEVELOPMENT OF A (GAMMA+BETA-0) LAMELLAR MICROSTRUCTURE IN A TI45AL50MO5 ALLOY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID DEFORMATION C1 UNITED TECHNOL RES CTR,E HARTFORD,CT 06108. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. RP DAS, S (reprint author), UNIV WISCONSIN,DEPT MAT SCI & ENGN,1509 UNIV AVE,MADISON,WI 53706, USA. NR 18 TC 15 Z9 15 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD FEB 15 PY 1993 VL 28 IS 4 BP 489 EP 494 DI 10.1016/0956-716X(93)90088-A PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KG947 UT WOS:A1993KG94700017 ER PT J AU WRIGHT, JK WRIGHT, RN MOORE, GA AF WRIGHT, JK WRIGHT, RN MOORE, GA TI COMBUSTION SYNTHESIZED IRON ALUMINIDE COATINGS AND JOINTS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID POWDER; NICKEL; FE3AL RP WRIGHT, JK (reprint author), IDAHO NATL ENGN LAB,IDAHO FALLS,ID, USA. OI Wright, Jill/0000-0001-8909-8144 NR 18 TC 22 Z9 24 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD FEB 15 PY 1993 VL 28 IS 4 BP 501 EP 506 DI 10.1016/0956-716X(93)90090-F PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KG947 UT WOS:A1993KG94700019 ER PT J AU BRUNE, JN BROWN, S JOHNSON, PA AF BRUNE, JN BROWN, S JOHNSON, PA TI RUPTURE MECHANISM AND INTERFACE SEPARATION IN FOAM RUBBER MODELS OF EARTHQUAKES - A POSSIBLE SOLUTION TO THE HEAT-FLOW PARADOX AND THE PARADOX OF LARGE OVERTHRUSTS SO TECTONOPHYSICS LA English DT Article ID SAN-ANDREAS FAULT; 2.1 KM DEPTH; STICK-SLIP; CAJON PASS; CORNER FREQUENCY; STRESS; STATE; FRICTION; CALIFORNIA; SPECTRA AB Spontaneous stick-slip along the interface between stressed foam rubber blocks is a simple analog of earthquake rupture and stick-slip. Results from this model are used to elucidate the role of normal stress variations along the interface in the stick-slip process. Observations indicate significant normal interface vibrations and separation during slip, suggesting that dynamic changes in normal stress (rather than a drop in the coefficient of friction) may control stick-slip, as suggested, for example, by Tolstoi, Oden and Martins and Brune and co-workers. Observations of particle trajectories indicate that stick-slip shear motion is associated with various degrees of fault separation. For an asymmetric model, the motion is consistent with slipping motion of the type suggested by Schallamach and Price. For a symmetric model, the motion is similar to that suggested by Comninou and Dundurs. If interface waves of this type, involving separation during slip, occur in earthquakes, they may be a solution to the heat flow paradox, since a major part of the slip occurs during separation and during low normal stress. Thus frictional heat generation is reduced. Normal interface vibrations during stick-slip may explain the high comer frequency of P wave spectra and the generally high levels of P wave spectra beyond the corner frequency. Schallamach-Comninou type waves are consistent with the partial stress drop-abrupt locking-self healing models of Brune and Heaton. C1 SANDIA NATL LABS, DIV GEOMECH 6232, ALBUQUERQUE, NM 87185 USA. RP UNIV NEVADA, SEISMOL LAB, RENO, NV 89557 USA. NR 62 TC 152 Z9 155 U1 0 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-1951 EI 1879-3266 J9 TECTONOPHYSICS JI Tectonophysics PD FEB 15 PY 1993 VL 218 IS 1-3 BP 59 EP 67 DI 10.1016/0040-1951(93)90259-M PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KN021 UT WOS:A1993KN02100005 ER PT J AU WU, W LANAGAN, MT KULLBERG, ML POEPPEL, RB WANG, B DANYLUK, S AF WU, W LANAGAN, MT KULLBERG, ML POEPPEL, RB WANG, B DANYLUK, S TI THE RELATIONSHIP BETWEEN MICROSTRUCTURE AND RESIDUAL-STRESS IN YBA2CU3O7-X SO THIN SOLID FILMS LA English DT Article ID FILMS AB Sol-gel films of YBa2Cu3Ox (YBCO) were deposited by spray pyrolysis on 10 cm diameter by 0.05 cm thick polycrystalline MgO wafers. The films were deposited in 1 mum increments up to 5 mum and characterized by electrical measurements, optical and electron microscopy, and X-ray diffraction. In-plane residual stresses of the films were obtained by a shadow moire interferometry technique. The YBCO-MgO interface was characterized by bevel polishing and fluorescence analysis. The films contain substantial in-plane residual stresses as a result of chemical reaction of the YBCO and MgO. Cu diffuses into the MgO so that a substantial amount of Y2BaCuO5 phase forms near the interface. The largest tensile stress was 0.96 GPa in a 4 mum thick film. The stresses were highest at the center of the wafer and decreased toward the edge, and the in-plane stresses caused cracks to form. Formation of the 211 phase influenced T(c) (onset) and T(c) (zero resistance). The T(c) onset was 78 to 92 K, and T(c) (zero resistance) was 15-65 K depending on film thickness. C1 AMOCO CHEM CO,NAPERVILLE,IL 60566. UNIV ILLINOIS,DEPT CIVIL ENGN MECH & MET,CHICAGO,IL 60680. RP WU, W (reprint author), ARGONNE NATL LAB,DIV MAT & COMPONENTS TECHNOL,ARGONNE,IL 60439, USA. NR 10 TC 9 Z9 9 U1 1 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD FEB 15 PY 1993 VL 223 IS 2 BP 260 EP 268 DI 10.1016/0040-6090(93)90531-S PG 9 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA KN645 UT WOS:A1993KN64500010 ER PT J AU GIL, TJ MCCURDY, CW LENGSFIELD, BH AF GIL, TJ MCCURDY, CW LENGSFIELD, BH TI CONVERGENCE OF THE PROJECTED OPTICAL-POTENTIAL IN A COMPLEX KOHN CALCULATION OF ELASTIC E-HE SCATTERING SO JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article ID ELECTRON; COLLISIONS; ABINITIO; IMPACT AB The complex Kohn method, using correlated target states and a projected optical potential, is applied to elastic s-wave scattering of electrons from atomic helium in the energy range of the (1s2S2)2 S Feshbach resonance. A projected optical potential is a very useful construct in the study of electron-molecule scattering, but the convergence of this approximation has not been systematically investigated. In this study, the projected optical potential approximation is shown to be convergent and yields an energy and width of the He 2S resonance of 19.357 eV and 14 meV, respectively, in excellent agreement with experiment. RP GIL, TJ (reprint author), LAWRENCE LIVERMORE NATL LAB,THEORET ATOM & MOLEC PHYS GRP,L-438,POB 808,7000 E AVE,LIVERMORE,CA 94550, USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-4075 J9 J PHYS B-AT MOL OPT JI J. Phys. B-At. Mol. Opt. Phys. PD FEB 14 PY 1993 VL 26 IS 3 BP 509 EP 516 DI 10.1088/0953-4075/26/3/021 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KN677 UT WOS:A1993KN67700021 ER PT J AU JAFFKE, T HASHEMI, R CHRISTOPHOROU, LG ILLENBERGER, E BAUMGARTEL, H PINNADUWAGE, LA AF JAFFKE, T HASHEMI, R CHRISTOPHOROU, LG ILLENBERGER, E BAUMGARTEL, H PINNADUWAGE, LA TI PHOTOENHANCED DISSOCIATIVE ELECTRON-ATTACHMENT TO SO2 SO CHEMICAL PHYSICS LETTERS LA English DT Article ID SUPEREXCITED STATES; NITRIC-OXIDE AB Optically enhanced dissociative electron attachment to electronically excited SO2 molecules was observed using crossed laser, electron and molecular beams. Irradiation Of SO2 molecules with the 308 nm XeCl excimer laser line showed a sharp O- resonance at near zero electron energy in addition to the O- resonances from ground state SO2 at 4.55 and 7.3 eV. The additional O-resonance is attributed to the reaction hnu(308 nm) + SO2 --> SO2*(B-1(1) or 1A2 --> +e-(<0.5 eV)SO2-* --> O- + SO. The peak cross section value of this process is at least two orders of magnitude larger than dissociative attachment from ground state SO2. C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. UNIV TENNESSEE,DEPT COUNSELING,KNOXVILLE,TN 37996. RP JAFFKE, T (reprint author), FREE UNIV BERLIN,INST THEORET & PHYS CHEM,TAKUSTR 3,W-1000 BERLIN 33,GERMANY. NR 26 TC 24 Z9 24 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD FEB 12 PY 1993 VL 203 IS 1 BP 21 EP 27 DI 10.1016/0009-2614(93)89303-Y PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KL412 UT WOS:A1993KL41200005 ER PT J AU SEIDELMORGENSTERN, A GUIOCHON, G AF SEIDELMORGENSTERN, A GUIOCHON, G TI THERMODYNAMICS OF THE ADSORPTION OF TROGER BASE ENANTIOMERS FROM ETHANOL ON CELLULOSE TRIACETATE SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID STATIONARY PHASE; CHROMATOGRAPHY; RESOLUTION AB The adsorption isotherms of the (-)- and (+)-enantiomers of Troger's base on microcrystalline cellulose triacetate with ethanol as solvent were measured at 30,40, 50 and 60-degrees-C using frontal analysis. The isotherms of the first eluted (-)-enantiomer can be described satisfactorily with the Langmuir equation at all temperatures. By contrast, the isotherms of the longer retained (+)-enantiomer exhibit a pronounced inflection point in the lower temperature range. This point nearly vanishes at 60-degrees-C where the isotherm is almost linear in the concentration range investigated. All these isotherms can be satisfactorily described by a quadratic isotherm equation. The standard thermodynamic functions were derived from these equilibrium data. The enthalpies and the isosteric heats of adsorption are not constant in the temperature region studied. The adsorption enthalpies of both enantiomers increase with increasing temperature. At constant temperature, the isosteric heat of adsorption of the (-)-enantiomer depends only slightly on the stationary phase concentration whereas that of the (+)-enantiomer increases strongly with increasing concentration. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. OI Seidel-Morgenstern, Andreas/0000-0001-8595-7810 NR 21 TC 35 Z9 35 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD FEB 12 PY 1993 VL 631 IS 1-2 BP 37 EP 47 DI 10.1016/0021-9673(93)80505-3 PG 11 WC Chemistry, Analytical SC Chemistry GA KM847 UT WOS:A1993KM84700004 ER PT J AU SCHMIDT, CF SVOBODA, K LEI, N PETSCHE, IB BERMAN, LE SAFINYA, CR GREST, GS AF SCHMIDT, CF SVOBODA, K LEI, N PETSCHE, IB BERMAN, LE SAFINYA, CR GREST, GS TI EXISTENCE OF A FLAT PHASE IN RED-CELL MEMBRANE SKELETONS SO SCIENCE LA English DT Article ID HUMAN-ERYTHROCYTE MEMBRANE; TETHERED MEMBRANES; MOLECULAR-DYNAMICS; X-RAY; FLUCTUATIONS; LAMELLAR; SURFACES; SPECTRIN; SYSTEM; SHAPE AB Biomolecular membranes display rich statistical mechanical behavior. They are classified as liquid in the absence of shear elasticity in the plane of the membrane and tethered (solid) when the neighboring molecules or subunits are connected and the membranes exhibit solid-like elastic behavior in the plane of the membrane. The spectrin skeleton of red blood cells was studied as a model tethered membrane. The static structure factor of the skeletons, measured by small-angle x-ray and light scattering, was fitted with a structure factor predicted with a model calculation. The model describes tethered membrane sheets with free edges in a flat phase, which is a locally rough but globally flat membrane configuration. The fit was good for large scattering vectors. The membrane roughness exponent, zeta, defined through h is-proportional-to L(zeta), where h is the average amplitude of out-of-plane fluctuations and L is the linear membrane dimension, was determined to be 0.65 +/- 0.10. Computer simulations of model red blood cell skeletons also showed this flat phase. The value for the roughness exponent, which was determined from the scaling properties of membranes of different sizes, was consistent with that from the experiments. C1 HARVARD UNIV,DEPT CELLULAR & DEV BIOL,CAMBRIDGE,MA 02138. HARVARD UNIV,DEPT PHYS,CAMBRIDGE,MA 02138. EXXON RES & ENGN CO,ANNANDALE,NJ 08801. BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. UNIV CALIF SANTA BARBARA,DEPT MAT & PHYS,SANTA BARBARA,CA 93106. RP SCHMIDT, CF (reprint author), ROWLAND INST SCI INC,100 CAMBRIDGE PKWY,CAMBRIDGE,MA 02142, USA. RI Schmidt, Christoph/G-3787-2011 OI Schmidt, Christoph/0000-0003-2864-6973 NR 34 TC 91 Z9 91 U1 1 U2 6 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD FEB 12 PY 1993 VL 259 IS 5097 BP 952 EP 954 DI 10.1126/science.8438153 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KL800 UT WOS:A1993KL80000036 PM 8438153 ER PT J AU FLETCHER, DE AF FLETCHER, DE TI NEST ASSOCIATION OF DUSKY SHINERS (NOTROPIS-CUMMINGSAE) AND REDBREAST SUNFISH (LEPOMIS-AURITUS), A POTENTIALLY PARASITIC RELATIONSHIP SO COPEIA LA English DT Article ID SELFISH HERD; BROOD PARASITISM; GEOMETRY; BIRDS; CARE AB Age-specific habitat segregation and localized migrations to spawning grounds were noted in Notropis cummingsae (dusky shiner) in the Savannah River drainage, South Carolina. Notropis cummingsae spent most of their adult lives associated with noticeable current, usually in scour pools or eddies. Slow, still pools were used for spawning and larval rearing. The young N. cummingsae remained in the pools until juveniles, then joined the adults in faster water. Within pools, N. cummingsae spawned in the nests of Lepomis auritus (redbreast sunfish). The L. auritus defended their nests from N. cummingsae, but the symbionts accessed the nest primarily when the guarding male host was away from the nest or preoccupied with another centrarchid. While on the spawning grounds, N. cummingsae fed voraciously on eggs within the centrarchid nests. Gut content analysis of these N. cummingsae indicated that they ate almost exclusively centrarchid eggs/larvae even though eggs/larvae of both species were in the nest. A mean of up to 9.2 larvae was eaten per N. cummingsae, and from 15 to over 100 individuals were observed in a nest at one time. Predation of eggs/larvae by N. cummingsae appears to reduce the reproductive success of the host, resulting in a parasitic nest association, but more detailed research is necessary to determine this unequivocally. RP FLETCHER, DE (reprint author), SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802, USA. NR 33 TC 29 Z9 30 U1 0 U2 1 PU AMER SOC ICHTHYOLOGISTS HERPETOLOGISTS BUSINESS OFFICE PI CARBONDALE PA SOUTHERN ILLINOIS UNIV, DEPT ZOOLOGY, CARBONDALE, IL 62901-6501 SN 0045-8511 J9 COPEIA JI Copeia PD FEB 11 PY 1993 IS 1 BP 159 EP 167 DI 10.2307/1446306 PG 9 WC Zoology SC Zoology GA KN220 UT WOS:A1993KN22000016 ER PT J AU HOFFMAN, DK ARNOLD, M KOURI, DJ AF HOFFMAN, DK ARNOLD, M KOURI, DJ TI TRAVELING DISTRIBUTED APPROXIMATING FUNCTION-APPROACH TO WAVE PACKET PROPAGATION - EXPLICIT INCLUSION OF A LOCAL WAVE VELOCITY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID TIME AB The distributed approximating function (DAF) approach to wave packet propagation, designed to treat a restricted class of wave packets which can be approximated to a specified level of accuracy by a polynomial of degree M under the envelope of the DAF, is modified to take explicit account of the group velocity of the specific wave packet describing the collision system of interest. Because the DAFs are exactly and analytically freely propagatible, they yield an accurate analytical fit of the freely propagated wave packet also, which expression can be used to obtain the coordinate representation ''traveling'' DAF (TDAF) class free propagator. TDAFs are similar to the original DAFs studied earlier, which we here refer to as ''stationary'' DAFs (SDAFs). The TDAF yields a more efficient propagation of the wave packet under consideration than does the corresponding SDAF. This reflects the explicit inclusion of the wave packet oscillations associated with a characteristic velocity in the DAF. The structure of the TDAF class free propaptor is analyzed in both the coordinate and momentum representations. The TDAF is generalized to include a position-dependent (local) wave velocity. Two ways in which this can be done are discussed and compared. One of these we label ''progression'' (corresponding to an evolution from the initial state to a final state) dynamics and the other ''regression'' (corresponding to moving backward from the final to an initial state) dynamics. Also, a ''grid transfer'' method is introduced to separate incident and scattered pieces of the packet in regions where they overlap, so that the TDAF concept can be applied effectively. Finally, two simple, but computationally demanding, 1-D problems are discussed which illustrate the utility of the method. The TDAF procedure is shown to be highly accurate on a discretized grid, even for an electron transmission problem that required 120 000 time steps (for a total of 60 ps) to complete the scattering. It is found that the TDAF method can greatly reduce the required computational effort by narrowing the spatial bandwidth of the DAF class free propagator. C1 UNIV HOUSTON,DEPT PHYS,HOUSTON,TX 77204. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. UNIV HOUSTON,DEPT CHEM,HOUSTON,TX 77204. NR 17 TC 18 Z9 18 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 FEB 11 PY 1993 VL 97 IS 6 BP 1110 EP 1118 DI 10.1021/j100108a003 PG 9 WC Chemistry, Physical SC Chemistry GA KL860 UT WOS:A1993KL86000003 ER PT J AU BLATTER, F FREI, H AF BLATTER, F FREI, H TI VISIBLE-LIGHT-INDUCED PHOTOCHEMISTRY OF 2,3-DIMETHYL-2-BUTENE.N2O4 CHARGE-TRANSFER COMPLEXES IN SOLID INERT MATRICES AT 75-K SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CRYOGENIC MATRIX; NO2 AB Continuous-wave laser-induced photochemistry of 2,3-dimethyl-2-butene (DMB).s-N2O4 complexes embedded in solid CO2 and solid Xe at 75 K was observed at wavelengths as long as 488 nm (s: symmetric form (O2N-NO2)). The chemistry was monitored by Fourier transform infrared and UV-visible spectroscopy. Products identified by N-15 and O-18 isotope substitution were 2,3-dimethyl-3-nitroso-2-butyl nitrate (major), 2,3-dimethyl-3-nitro-2-butyl nitrite, and a-N2O3 (both minor). A mechanism is proposed that is distinct from that previously suggested for thermal alkene + N2O4 chemistry in solution and liquid N2O4. UV-visible spectra of DMB.s-N2O4, 2-methyl-2-butene.s-N2O4, and trans-2-butene.s-N2O4 complexes in solid CO2 revealed intense new absorptions with maxima at 360, 338, and 296 nm, respectively. These are assigned to charge-transfer transitions. The DMB.s-N2O4 charge-transfer band extends to 550 nm and is responsible for the observed photochemistry. C1 LAWRENCE BERKELEY LAB,CHEM BIODYNAM LAB,BERKELEY,CA 94720. NR 23 TC 7 Z9 7 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 11 PY 1993 VL 97 IS 6 BP 1178 EP 1183 DI 10.1021/j100108a013 PG 6 WC Chemistry, Physical SC Chemistry GA KL860 UT WOS:A1993KL86000013 ER PT J AU PORTER, JD ZINN, AS AF PORTER, JD ZINN, AS TI ORDERING OF LIQUID WATER AT METAL-SURFACES IN TUNNEL JUNCTION DEVICES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Review ID MOLECULAR-DYNAMICS SIMULATION; MONTE-CARLO SIMULATION; MEAN SPHERICAL APPROXIMATION; LENNARD-JONES WALLS; SIMPLE DENSE FLUIDS; AQUEOUS-ELECTROLYTE SOLUTIONS; ORNSTEIN-ZERNIKE EQUATION; ELECTRICAL DOUBLE-LAYERS; VAPOR INTERFACE; COMPUTER-SIMULATION AB A tunnel junction device was made by immersing mercury electrodes in an aqueous nitrate solution. The junction conductance was measured at zero bias as the two mercury surfaces were brought together in the solution. Changes in separation between the mercury surfaces were calculated from changes in the junction conductance using a simple model of elastic electron tunneling, due to Simmons. An absolute distance scale was established using the estimated hard-sphere diameter of water as an internal standard. Discrete changes in junction conductance were observed when the metal surfaces were separated by less than about 1 nm. We interpret this behavior to be due to the presence of quasi-equilibrium junction geometrics which are themselves due to time-averaged structuring of liquid water near the metal surfaces. The longitudinal structuring in the water was found to decay normal to the metal surface with a characteristic length on the order of the molecular diameter. The time-averaged structures of the liquid water domains appear to be similar to the structure of hexagonal ice Ih and do not resemble hard-sphere packing. At zero bias, there appears to be no strong preference for one type of ordered water structure over another, suggesting that hydrogen bonding is the dominant factor determining structure in the liquid water near the metal surface and not metal-water bonding in this case. Our experimental data are in substantial agreement with recent molecular dynamics and Monte Carlo simulations and with analytic theory. There are significant differences between our results for ordering of liquid water at metal surfaces and the results reported previously for local ordering of liquid water in the mica/water/mica surface force-balance apparatus. C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP PORTER, JD (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. NR 175 TC 61 Z9 61 U1 2 U2 14 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 FEB 11 PY 1993 VL 97 IS 6 BP 1190 EP 1203 DI 10.1021/j100108a015 PG 14 WC Chemistry, Physical SC Chemistry GA KL860 UT WOS:A1993KL86000015 ER PT J AU HULLA, JE SCHNEIDER, RP AF HULLA, JE SCHNEIDER, RP TI STRUCTURE OF THE RAT P53 TUMOR SUPPRESSOR GENE SO NUCLEIC ACIDS RESEARCH LA English DT Article ID HUMAN CANCERS; MUTATIONS; PROTEIN; ANTIGEN; PSEUDOGENE; EXPRESSION AB Aberration within the p53 tumor suppressor gene is the most frequently identified genetic damage in human cancer. Regulatory functions proposed for the p53 protein include modulation of the cell cycle, cellular differentiation, signal transduction, and gene expression. Additionally, the p53 gene product may guard the genome against incorporation of damaged DNA. To facilitate study of its role in carcinogenesis using a common animal model, we determined the structure of the rat p53 gene. We identified 18 splice sites and defined 25 bases of the intervening sequences adjacent to these sites. We also discovered an allelic polymorphism that occurs within intron 5 of the gene. The rat gene approximates the mouse ortholog. It is 12 kb in length with the non-coding exon 1 separated from exon 2 by 6.2 kb of intervening sequence. The location and size of all rat gene introns approximate those of the mouse. Whereas the mouse and human genes each contain 11 exons, the rat p53 gene is composed of only 10. No intervening sequence occurs between the region of the rat gene corresponding to exons 6 and 7 of the mouse and human p53 genes. This implies intron 6 may be functionally insignificant for species in which it is retained. To extrapolate to p53 involvement in human tumorigenesis, we suggest that mutational events within intron 6 may not be of pathological significance unless splicing is hindered. RP HULLA, JE (reprint author), PACIFIC NW LAB, BOX 999, MSIN P7-56, RICHLAND, WA 99352 USA. NR 35 TC 84 Z9 85 U1 1 U2 4 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD FEB 11 PY 1993 VL 21 IS 3 BP 713 EP 717 DI 10.1093/nar/21.3.713 PG 5 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KN345 UT WOS:A1993KN34500048 PM 8441680 ER PT J AU KAWALER, SD AF KAWALER, SD TI RADIAL PULSATIONS IN DB WHITE-DWARFS SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, OSCILLATIONS; WHITE DWARFS ID STARS; MASS AB Theoretical models of DB white dwarfs are unstable against radial pulsation at effective temperatures near 20,000-30,000 K. Many high-overtone modes are unstable, with periods ranging from 12 s down to the acoustic cutoff period of approximately 0.1 s. The blue edge for radial instability lies at slightly higher effective temperatures than for nonradial pulsations, with the temperature of the blue edge dependent on the assumed efficiency of convection. Models with increased convective efficiency have radial blue edges that are increasingly closer to the nonradial blue edge; in all models the instability persists into the nonradial instability strip. Radial pulsations therefore may exist in the hottest DB stars that lie below the DB gap; the greatest chance for detection would be observations in the ultraviolet. These models also explain why searches for radial pulsations in DA white dwarfs have failed: the efficient convection needed to explain the blue edge for nonradial DA pulsation means that the radial instability strip is 1000 K cooler than found in previous investigations. The multiperiodic nature of the expected pulsations can be used to advantage to identify very low amplitude modes using the uniform spacing of the modes in frequency. This frequency spacing is a direct indicator of the mass of the star. RP KAWALER, SD (reprint author), IOWA STATE UNIV SCI & TECHNOL,US DOE,AMES LAB,DEPT PHYS & ASTRON,AMES,IA 50011, USA. OI Kawaler, Steven/0000-0002-6536-6367 NR 34 TC 19 Z9 19 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD FEB 10 PY 1993 VL 404 IS 1 BP 294 EP 304 DI 10.1086/172279 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK912 UT WOS:A1993KK91200027 ER PT J AU DOROKHOV, AE KOCHELEV, NI ZUBOV, YA AF DOROKHOV, AE KOCHELEV, NI ZUBOV, YA TI PROTON SPIN WITHIN NONPERTURBATIVE QCD SO INTERNATIONAL JOURNAL OF MODERN PHYSICS A LA English DT Article AB A review of various approaches to the problem of the proton spin is presented. Arguments are given in favor of the idea that the answer to the ''spin crisis'' is to be found in fundamental nonperturbative properties of the QCD vacuum. RP DOROKHOV, AE (reprint author), ARGONNE NATL LAB,DIV PHYS,9700 S CASS AVE,ARGONNE,IL 60439, USA. NR 0 TC 70 Z9 70 U1 0 U2 1 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0217-751X J9 INT J MOD PHYS A JI Int. J. Mod. Phys. A PD FEB 10 PY 1993 VL 8 IS 4 BP 603 EP 651 DI 10.1142/S0217751X93000242 PG 49 WC Physics, Nuclear; Physics, Particles & Fields SC Physics GA KK511 UT WOS:A1993KK51100001 ER PT J AU FITCH, MW KOROS, WJ NOLEN, RL CARNES, JR AF FITCH, MW KOROS, WJ NOLEN, RL CARNES, JR TI PERMEATION OF SEVERAL GASES THROUGH ELASTOMERS, WITH EMPHASIS ON THE DEUTERIUM HYDROGEN PAIR SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID ISOTOPIC POLYMER MIXTURES; THERMODYNAMICS AB The diffusion and permeation coefficients for He, H-2, D2, O2, and N2 in a variety of elastomers were measured by simple manometric methods. The elastomers studied were butyl rubber; Hypalon(R) 40 and 45; Viton(R) E60 and GF; Hydrin(R) 100 and filled Hydrin(R) 100; Kraton(R) G, FG, and KG VTEOS; EPDM; epoxidized natural rubber; and neoprene. Consistent with earlier studies, elastomers with higher glass transition temperatures exhibited lower diffusion coefficients. The ratio of diffusion coefficients of the hydrogen isotope pair differed from the purely molecular-weight-based prediction. Deuterium's slightly smaller size relative to hydrogen is consistent with observed deviations from the molecular-weight-based diffusion coefficient ratio. C1 UNIV TEXAS,DEPT CHEM ENGN,AUSTIN,TX 78712. LOS ALAMOS NATL LAB,WX-5 GRP,LOS ALAMOS,NM 87545. NR 18 TC 19 Z9 19 U1 2 U2 8 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD FEB 10 PY 1993 VL 47 IS 6 BP 1033 EP 1046 DI 10.1002/app.1993.070470610 PG 14 WC Polymer Science SC Polymer Science GA KH246 UT WOS:A1993KH24600010 ER PT J AU ZEUCH, DH MONTGOMERY, ST KECK, JD AF ZEUCH, DH MONTGOMERY, ST KECK, JD TI SOME OBSERVATIONS ON THE EFFECTS OF SHEAR-STRESS ON A POLYMORPHIC TRANSFORMATION IN PEROVSKITE-STRUCTURED LEAD-ZIRCONATE-TITANATE CERAMIC SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SOLID-SOLUTION SYSTEM; THERMODYNAMIC THEORY; PHASE-TRANSITIONS; MECHANISM AB We performed a series of hydrostatic and constant-stress-difference (CSD) experiments at room temperature on modified lead-zirconate-titanate (PZT 95/5-2Nb) ceramic in order to quantify the influence of shear stress on the displacive, and possibly martensitic, first-order, ferroelectric/rhombohedral --> antiferroelectric/orthorhombic phase transformation. In hydrostatic compression, the transformation began at approximately 260 MPa and was incompletely reversed upon return to ambient conditions. Strains associated with the transformation were isotropic, both on the first and subsequent hydrostatic cycles. Results for the CSD tests were quite different. First, the confining pressure and mean stress at which the transition begins decreased approximately linearly with increasing stress difference. Second, we observed that the rate of transformation apparently decreased with increasing shear stress and the accompanying purely elastic shear strain. This result contrasts with the almost universal assertion that shear stresses accelerate reaction and transformation kinetics. Finally, strain was not isotropic during the transformation: axial strains were greater and lateral strains smaller than for the hydrostatic case, though volumetric strain behavior was comparable for the two types of tests. However, this last effect does not appear to be an example of transformational plasticity but, rather, a ''one-time'' occurrence: no additional unexpected strains accumulated during subsequent cycles through the transition under nonhydrostatic loading. If subsequent hydrostatic cycles were performed on samples previously run under CSD conditions, strain anisotropy was again observed, indicating that the earlier superimposed shear stress produced a permanent mechanical anisotropy in the material. The mechanical anisotropy probably results from a crystallographic preferred orientation that developed during the transformation under shear stress. RP ZEUCH, DH (reprint author), SANDIA NATL LABS,DEPT GEOMECH 6117,ALBUQUERQUE,NM 87185, USA. NR 59 TC 1 Z9 1 U1 1 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD FEB 10 PY 1993 VL 98 IS B2 BP 1901 EP 1911 DI 10.1029/92JB02174 PG 11 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KL595 UT WOS:A1993KL59500015 ER PT J AU GLENN, LA AF GLENN, LA TI ENERGY-DENSITY EFFECTS ON SEISMIC DECOUPLING SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID SALMON; CAVITY; SALT AB The teleseismic amplitude resulting from an underground explosion is proportional to the asymptotic value of the reduced displacement potential (phi(infinity) or, in physical terms, to the permanent change in volume measured anywhere beyond the range at which the outgoing wave has become elastic. It is known that phi(infinity) decreases with increasing initial cavity size (r0) until the cavity is large enough to preclude inelastic behavior in the surrounding rock, at which point no further decrease occurs. Earlier numerical calculations suggested that phi(infinity) was not a monotonic function of the initial energy density and that the seismic amplitude might actually be decreased, in certain cases, by decreasing the initial cavity size. We have examined this question from an analytical point of view and derived the seismic response for a simple linear-elastic, perfectly plastic medium as r0 --> 0. In this limit, an exact, power law relationship is found between phi(infinity)/W and r0W-1/3, where W is the yield, a result which implies that phi(infinity) vanishes altogether for an explosion in which the initial cavity radius is vanishingly small. The physical explanation for this curious behavior is shown to derive from the unique inability of a Hooke's law medium to generate thermal pressure. A similar, but less dramatic, effect is demonstrated with more realistic material models. The significance of these results is that the estimation of yield from measurement of seismic amplitude may be a less accurate process than previously suspected. RP LAWRENCE LIVERMORE NATL LAB, DEPT EARTH SCI, L-200, BOX 808, LIVERMORE, CA 94550 USA. NR 18 TC 7 Z9 11 U1 1 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD FEB 10 PY 1993 VL 98 IS B2 BP 1933 EP 1942 DI 10.1029/92JB02278 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KL595 UT WOS:A1993KL59500018 ER PT J AU SPEVAK, W NAGY, JO CHARYCH, DH SCHAEFER, ME GILBERT, JH BEDNARSKI, MD AF SPEVAK, W NAGY, JO CHARYCH, DH SCHAEFER, ME GILBERT, JH BEDNARSKI, MD TI POLYMERIZED LIPOSOMES CONTAINING C-GLYCOSIDES OF SIALIC-ACID - POTENT INHIBITORS OF INFLUENZA-VIRUS INVITRO INFECTIVITY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID SIALOSIDE INHIBITORS; BIVALENT SIALOSIDES; MEMBRANE-FUSION; A VIRUS; HEMAGGLUTININ; RECOGNITION; RECEPTOR; EQUINE; GLYCOPROTEIN; VARIANTS C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,BERKELEY,CA 94720. GLYCOMED INC,DEPT MICROBIOL & IMMUNOL,ALAMEDA,CA 94501. NR 31 TC 160 Z9 162 U1 2 U2 11 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 FEB 10 PY 1993 VL 115 IS 3 BP 1146 EP 1147 DI 10.1021/ja00056a047 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA KL716 UT WOS:A1993KL71600047 ER PT J AU ASHBY, EC DOCTOROVICH, F LIOTTA, CL NEUMANN, HM BAREFIELD, EK KONDA, A ZHANG, K HURLEY, J SIEMER, DD AF ASHBY, EC DOCTOROVICH, F LIOTTA, CL NEUMANN, HM BAREFIELD, EK KONDA, A ZHANG, K HURLEY, J SIEMER, DD TI CONCERNING THE FORMATION OF HYDROGEN IN NUCLEAR WASTE - QUANTITATIVE GENERATION OF HYDROGEN VIA A CANNIZZARO INTERMEDIATE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note C1 WESTINGHOUSE IDAHO NUCL CO INC,IDAHO FALLS,ID 83403. RP ASHBY, EC (reprint author), GEORGIA INST TECHNOL,SCH CHEM & BIOCHEM,ATLANTA,GA 30332, USA. NR 11 TC 34 Z9 34 U1 1 U2 5 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 FEB 10 PY 1993 VL 115 IS 3 BP 1171 EP 1173 DI 10.1021/ja00056a065 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA KL716 UT WOS:A1993KL71600065 ER PT J AU WHITTEN, JE YOUNG, CE PELLIN, MJ GRUEN, DM JONES, PL AF WHITTEN, JE YOUNG, CE PELLIN, MJ GRUEN, DM JONES, PL TI DIRECT DETECTION OF A METAL DESORPTION CHANNEL - ELECTRON-STIMULATED DESORPTION OF ALUMINUM FROM METHANOL-DOSED AL(111) SO SURFACE SCIENCE LA English DT Article ID VELOCITY DISTRIBUTIONS; LASER IONIZATION; AL-XIII; NEUTRALS; SURFACES; DECOMPOSITION; MECHANISMS; ADSORPTION; ADSORBATES; IMPACT AB Multiphoton laser ionization mass spectrometry has been used to investigate neutrals produced in 1 keV electron-stimulated desorption (ESD) from Al(111) which was methanol-dosed to produce the monolayer-coverage CH3O/Al(111) system. The major neutral desorption channel consists of CH3O, the methoxy species, detected primarily as the C+, CH+, and CO+ photofragments. The novel observation of the desorption of metal substrate was facilitated by the overlap of 193 nm laser radiation with a strong Al autoionization transition. Differences between the laser power dependence of ESD-produced Al+ signal and that from sputtered aluminum atoms, photoionized in a reference experiment, suggest that ESD releases an aluminum-containing molecule which is efficiently photofragmented to Al atoms; no molecular precursor was detectable directly. Velocity distributions of the methoxy photofragments and the Al+ photoion have been measured. The former have distributions which peak at approximately 1100 m/s, corresponding to a kinetic energy of 0.19 eV for the parent methoxy desorbate. The aluminum distribution peaks at approximately 800 m/s and exhibits less population in the high-velocity region. These differences indicate that the detected aluminum is independent of the major desorption channel: neutral methoxy. An absolute yield measurement for aluminum of 1.7 x 10(-6) atoms per incident 1 keV electron was substantially lower than that for the methoxy channel (yield almost-equal-to 10(-3)). In addition, it is shown that increasing the temperature of the surface to approximately 600 K, where methoxy is known to be decomposed on Al(111), leads to a drastic decrease in the desorbed aluminum signal. The findings are discussed in the context of current desorption theories. C1 ARGONNE NATL LAB,DIV MAT SCI CHEM,ARGONNE,IL 60439. OHIO STATE UNIV,DEPT CHEM,COLUMBUS,OH 43210. STI OPTRON,BELLEVUE,WA 98004. RI Pellin, Michael/B-5897-2008 OI Pellin, Michael/0000-0002-8149-9768 NR 41 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 10 PY 1993 VL 282 IS 1-2 BP 97 EP 112 DI 10.1016/0039-6028(93)90613-O PG 16 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA KL708 UT WOS:A1993KL70800010 ER PT J AU FEIBELMAN, PJ AF FEIBELMAN, PJ TI PERTURBATION OF SURFACE-PLASMON DISPERSION BY EXTRA ELECTRONS NEAR A SURFACE SO SURFACE SCIENCE LA English DT Article ID ENERGY-LOSS SPECTROSCOPY; AG SINGLE-CRYSTALS; COEFFICIENT; ABSORPTION; DEPENDENCE; PARTICLES AB An analytic formula is derived for the lowest-order effects of an added layer of electron density on the d-parameters of the theory of jellium-surface electromagnetic fields. The formula provides a basis for understanding how the d-electrons near the surface of a noble metal modify its long-wavelength surface plasmon dispersion. Thus, it helps explain why the linear coefficient of surface plasmon dispersion is larger on Ag(001) than on Ag(111), and in the [001] than in the [110BAR] direction on Ag(110), and also why it is positive in all these cases. RP FEIBELMAN, PJ (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 32 TC 29 Z9 29 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 10 PY 1993 VL 282 IS 1-2 BP 129 EP 136 DI 10.1016/0039-6028(93)90616-R PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA KL708 UT WOS:A1993KL70800013 ER PT J AU SAPPEY, AD GAMBLE, TK ZERKLE, DK AF SAPPEY, AD GAMBLE, TK ZERKLE, DK TI ABSOLUTE COPPER ATOM DENSITY DETERMINATION IN LASER-ABLATED COPPER PLASMAS USING HOOK SPECTROSCOPY SO APPLIED PHYSICS LETTERS LA English DT Article AB Hook spectroscopy has been implemented to measure the absolute density of atomic species in a laser-ablated plasma plume. We use the hook method to determine the density of copper atoms produced by ablation of a copper target in 25 Torr of helium at power densities of approximately 1 GW/cm2. The measured copper densities when ablating into 25 Torr of helium backing gas range from 1.5 X 10(15) CM-3 at a delay of 200 mus to 4.4 X 10(13) CM-3 at 5 ms delay. This dramatic decrease in density is due to condensation of the metal vapor to form fine particulate. RP SAPPEY, AD (reprint author), LOS ALAMOS NATL LAB,DIV CHEM & LASER SCI,LOS ALAMOS,NM 87545, USA. NR 8 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 FEB 8 PY 1993 VL 62 IS 6 BP 564 EP 566 DI 10.1063/1.108912 PG 3 WC Physics, Applied SC Physics GA KK924 UT WOS:A1993KK92400009 ER PT J AU WILSON, RK ANDERSON, K AINSCOUGH, R ANTONACCIFULTON, L BERKS, M COOPER, J CONNELL, M COULSON, A CRAXTON, M DEAR, S DU, Z DURBIN, R FAVELLO, A GREEN, P HAWKINS, J HAWKINS, T HILLIER, L HUYNH, C JOHNSTON, L KERSHAW, J KIRSTEN, J KOZONO, Y LAISTER, N LATREILLE, J MARTIN, C RAMACHANDRA, S ROOPRA, A SHOWNKEEN, R SMALDON, N SMITH, A STADEN, R SULSTON, J THIERRYMIEG, J THOMAS, K VAUDIN, M WATERSTON, R WOHLDMANN, P ZHU, J AF WILSON, RK ANDERSON, K AINSCOUGH, R ANTONACCIFULTON, L BERKS, M COOPER, J CONNELL, M COULSON, A CRAXTON, M DEAR, S DU, Z DURBIN, R FAVELLO, A GREEN, P HAWKINS, J HAWKINS, T HILLIER, L HUYNH, C JOHNSTON, L KERSHAW, J KIRSTEN, J KOZONO, Y LAISTER, N LATREILLE, J MARTIN, C RAMACHANDRA, S ROOPRA, A SHOWNKEEN, R SMALDON, N SMITH, A STADEN, R SULSTON, J THIERRYMIEG, J THOMAS, K VAUDIN, M WATERSTON, R WOHLDMANN, P ZHU, J TI DNA-SEQUENCE ANALYSIS OF THE C-ELEGANS GENOME SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 WASHINGTON UNIV,SCH MED,DEPT GENET,ST LOUIS,MO 63110. MRC,MOLEC BIOL LAB,CAMBRIDGE CB2 2QH,ENGLAND. CNRS,CRBM,F-34044 MONTPELLIER,FRANCE. LAWRENCE BERKELEY LAB,CTR HUMAN GENOME,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 8 PY 1993 SU 17C BP 105 EP 105 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA KN466 UT WOS:A1993KN46600368 ER PT J AU STEVENS, A LARIMER, FW HSU, CL AF STEVENS, A LARIMER, FW HSU, CL TI CHARACTERIZATION OF 5'-]3' EXONUCLEASE-1 AND YEAST-CELLS LACKING THE ENZYME SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37830. NR 1 TC 0 Z9 0 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 8 PY 1993 SU 17C BP 158 EP 158 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA KN466 UT WOS:A1993KN46600542 ER PT J AU WEMMER, D GEHRING, K WILLIAMS, P MORIMOTO, H JAISWAL, D KUBINEC, M HIGHSMITH, S STORRS, R GEIERSTANGER, B VOLKMAN, B AF WEMMER, D GEHRING, K WILLIAMS, P MORIMOTO, H JAISWAL, D KUBINEC, M HIGHSMITH, S STORRS, R GEIERSTANGER, B VOLKMAN, B TI NMR-STUDIES OF LIGAND MACROMOLECULE INTERACTIONS SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,NATL TRITIUM LABELLING FACIL,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT BIOPHYS,BERKELEY,CA 94720. UNIV PACIFIC,SCH DENT,DEPT BIOCHEM,SAN FRANCISCO,CA 94115. RI Gehring, Kalle/I-4403-2013 OI Gehring, Kalle/0000-0001-6500-1184 NR 1 TC 0 Z9 0 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 8 PY 1993 SU 17C BP 209 EP 209 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA KN466 UT WOS:A1993KN46600705 ER PT J AU WEMMER, D GEHRING, K WILLIAMS, P MORIMOTO, H JAISWAL, D KUBINEC, M HIGHSMITH, S STORRS, R GEIERSTANGER, B VOLKMAN, B AF WEMMER, D GEHRING, K WILLIAMS, P MORIMOTO, H JAISWAL, D KUBINEC, M HIGHSMITH, S STORRS, R GEIERSTANGER, B VOLKMAN, B TI STUDIES OF LIGAND MACROMOLECULE INTERACTIONS SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 UNIV CA,DEPT CHEM,BERKELEY,CA. UNIV CA,DEPT BIOPHYS,BERKELEY,CA. LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,NATL TRITIUM LABELLING FACIL,BERKELEY,CA 94720. UNIV PACIFIC,SCH DENT,DEPT BIOCHEM,STOCKTON,CA 95211. RI Gehring, Kalle/I-4403-2013 OI Gehring, Kalle/0000-0001-6500-1184 NR 0 TC 0 Z9 0 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 8 PY 1993 SU 17C BP 249 EP 249 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA KN466 UT WOS:A1993KN46600839 ER PT J AU COSMAN, M DELOSSANTOS, C HINGERTY, B IBANEZ, V GEACINTOV, NE BROYDE, S PATEL, DJ AF COSMAN, M DELOSSANTOS, C HINGERTY, B IBANEZ, V GEACINTOV, NE BROYDE, S PATEL, DJ TI NMR-ENERGY MINIMIZATION STUDIES OF COVALENT STEREOSPECIFIC BENZO[A]PYRENE-DNA ADDUCTS SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 COLUMBIA UNIV,DEPT BIOCHEM & MOLEC BIOPHYS,NEW YORK,NY 10032. MEM SLOAN KETTERING CANC CTR,CELLULAR BIOCHEM & BIOPHYS,NEW YORK,NY 10021. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NYU,DEPT CHEM,NEW YORK,NY 10003. NYU,DEPT BIOL,NEW YORK,NY 10003. NR 0 TC 0 Z9 0 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 8 PY 1993 SU 17C BP 261 EP 261 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA KN466 UT WOS:A1993KN46600886 ER PT J AU KENNEDY, MA NUUTERO, ST DAVIS, JT DROBNY, GP REID, BR AF KENNEDY, MA NUUTERO, ST DAVIS, JT DROBNY, GP REID, BR TI EVIDENCE FOR MOBILITY AT THE TPA JUNCTION IN TNAN-CONTAINING DNA OLIGOMERS SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. UNIV WASHINGTON, DEPT CHEM, SEATTLE, WA 98195 USA. UNIV WASHINGTON, DEPT BIOCHEM, SEATTLE, WA 98195 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 8 PY 1993 SU 17C BP 264 EP 264 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA KN466 UT WOS:A1993KN46600897 ER PT J AU ABE, F AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, GM GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WU, D WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZUCCHELLI, S AF ABE, F AMIDEI, D ANWAYWIESE, C APOLLINARI, G ATAC, M AUCHINCLOSS, P BADEN, AR BACCHETTA, N BADGETT, W BAILEY, MW BAMBERGER, A DEBARBARO, P BARBAROGALTIERI, A BARNES, VE BARNETT, BA BAUER, G BAUMANN, T BEDESCHI, F BEHRENDS, S BELFORTE, S BELLETTINI, G BELLINGER, J BENJAMIN, D BENLLOCH, J BENSINGER, J BERETVAS, A BERGE, JP BERTOLUCCI, S BHADRA, S BINKLEY, M BISELLO, D BLAIR, R BLOCKER, C BODEK, A BOLOGNESI, V BOOTH, AW BOSWELL, C BRANDENBURG, G BROWN, D BUCKLEYGEER, E BUDD, HS BUSETTO, G BYONWAGNER, A BYRUM, KL CAMPAGNARI, C CAMPBELL, M CANER, A CAREY, R CARITHERS, W CARLSMITH, D CARROLL, JT CASHMORE, R CASTRO, A CERVELLI, F CHADWICK, K CHAPMAN, J CHIARELLI, G CHINOWSKY, W CIHANGIR, S CLARK, AG COBAL, M CONNOR, D CONTRERAS, M COOPER, J CORDELLI, M CRANE, D CUNNINGHAM, JD DAY, C DEJONGH, F DELLAGNELLO, S DELLORSO, M DEMORTIER, L DENBY, B DERWENT, PF DEVLIN, T DIBITONTO, D DICKSON, M DRUCKER, RB EINSWEILER, K ELIAS, JE ELY, R ENO, S ERREDE, S ETCHEGOYEN, A FARHAT, B FLAUGHER, B FOSTER, GW FRANKLIN, M FREEMAN, J FRISCH, H FUESS, T FUKUI, Y GARFINKEL, AF GAUTHIER, A GEER, S GERDES, DW GIANNETTI, P GIOKARIS, N GIROMINI, P GLADNEY, L GOLD, M GOULIANOS, K GRASSMANN, H GRIECO, GM GROSSOPILCHER, C HABER, C HAHN, SR HANDLER, R HARA, K HARRAL, B HARRIS, RM HAUGER, SA HAUSER, J HAWK, C HESSING, T HOLLEBEEK, R HOLLOWAY, L HONG, S HU, P HUBBARD, B HUFFMAN, BT HUGHES, R HURST, P HUTH, J HYLEN, J INCAGLI, M INO, T ISO, H JENSEN, H JESSOP, CP JOHNSON, RP JOSHI, U KADEL, RW KAMON, T KANDA, S KARDELIS, DA KARLINER, I KEARNS, E KEEBLE, L KEPHART, R KESTEN, P KEUP, RM KEUTELIAN, H KIM, D KIM, SB KIM, SH KIM, YK KIRSCH, L KONDO, K KONIGSBERG, J KOVACS, E KRASBERG, M KUHLMANN, SE KUNS, E LAASANEN, AT LAMMEL, S LAMOUREUX, JI LEONE, S LEWIS, JD LI, W LIMON, P LINDGREN, M LISS, TM LOCKYER, N LORETI, M LOW, EH LUCHINI, CB LUKENS, P MAAS, P MAESHIMA, K MANGANO, M MARRINER, JP MARIOTTI, M MARKELOFF, R MARKOSKY, LA MATTINGLY, R MCINTYRE, P MENZIONE, A MEYER, T MIKAMO, S MILLER, M MIMASHI, T MISCETTI, S MISHINA, M MIYASHITA, S MORITA, Y MOULDING, S MUELLER, J MUKHERJEE, A MULLER, T NAKAE, LF NAKANO, I NELSON, C NEWMANHOLMES, C NG, JST NINOMIYA, M NODULMAN, L OGAWA, S PAOLETTI, R PAPADIMITRIOU, V PARA, A PARE, E PARK, S PATRICK, J PAULETTA, G PESCARA, L PHILLIPS, TJ PTOHOS, F PLUNKETT, R PONDROM, L PROUDFOOT, J PUNZI, G QUARRIE, D RAGAN, K REDLINGER, G RHOADES, J ROACH, M RIMONDI, F RISTORI, L ROBERTSON, WJ RODRIGO, T ROHALY, T ROODMAN, A SAKUMOTO, WK SANSONI, A SARD, RD SAVOYNAVARRO, A SCARPINE, V SCHLABACH, P SCHMIDT, EE SCHNEIDER, O SCHUB, MH SCHWITTERS, R SCRIBANO, A SEGLER, S SEIYA, Y SHAPIRO, M SHAW, NM SHEAFF, M SHOCHET, M SIEGRIST, J SINERVO, P SKARHA, J SLIWA, K SMITH, DA SNIDER, FD SONG, L SONG, T SPAHN, M SPHICAS, P STDENIS, R STEFANINI, A SULLIVAN, G SUMOROK, K SWARTZ, RL TAKANO, M TAKIKAWA, K TAREM, S TARTARELLI, F TETHER, S THERIOT, D TIMKO, M TIPTON, P TKACZYK, S TOLLESTRUP, A TONNISON, J TRISCHUK, W TURINI, N TSAY, Y UKEGAWA, F UNDERWOOD, D VEJCIK, S VIDAL, R WAGNER, RG WAGNER, RL WAINER, N WALSH, J WATTS, T WEBB, R WENDT, C WENZEL, H WESTER, WC WESTHUSING, T WHITE, SN WICKLUND, AB WICKLUND, E WILLIAMS, HH WINER, BL WU, D WYSS, J YAGIL, A YASUOKA, K YEH, GP YOH, J YOKOYAMA, M YUN, JC ZANETTI, A ZETTI, F ZHANG, S ZUCCHELLI, S TI MEASUREMENT OF JET SHAPES IN (P)OVER-BAR-P COLLISIONS AT ROOT-S = 1.8 TEV SO PHYSICAL REVIEW LETTERS LA English DT Article ID LUND MONTE-CARLO; E+E ANNIHILATION; PBARP COLLISIONS; CROSS-SECTION; FRAGMENTATION; DISTRIBUTIONS; PHYSICS AB We present a measurement of jet shapes in ppBAR collisions at square-root s = 1.8 TeV at the Fermilab Tevatron using the Collider Detector at Fermilab (CDF). Qualitative agreement is seen with the predictions of recent next-to-leading [O(alpha(s)3)] calculations and with leading logarithm QCD based Monte Carlo simulations. The dependence of the jet shape on transverse energy is studied. C1 ARGONNE NATL LAB, ARGONNE, IL 60439 USA. BRANDEIS UNIV, WALTHAM, MA 02254 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. UNIV CHICAGO, CHICAGO, IL 60637 USA. DUKE UNIV, DURHAM, NC 27706 USA. FERMILAB NATL ACCELERATOR LAB, BATAVIA, IL 60510 USA. IST NAZL FIS NUCL, LAB NAZL FRASCATI, FRASCATI, ITALY. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. UNIV ILLINOIS, URBANA, IL 61801 USA. JOHNS HOPKINS UNIV, BALTIMORE, MD 21218 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. MIT, CAMBRIDGE, MA 02139 USA. UNIV MICHIGAN, ANN ARBOR, MI 48109 USA. UNIV PADUA, IST NAZL FIS NUCL, I-35131 PADUA, ITALY. UNIV PENN, PHILADELPHIA, PA 19104 USA. UNIV PISA, IST NAZL FIS NUCL, I-56100 PISA, ITALY. SCUOLA NORMALE SUPER PISA, I-56100 PISA, ITALY. PURDUE UNIV, W LAFAYETTE, IN 47907 USA. UNIV ROCHESTER, ROCHESTER, NY 14627 USA. ROCKEFELLER UNIV, NEW YORK, NY 10021 USA. RUTGERS STATE UNIV, PISCATAWAY, NJ 08854 USA. TEXAS A&M UNIV SYST, COLL STN, TX 77843 USA. UNIV TSUKUBA, TSUKUBA, IBARAKI 305, JAPAN. TUFTS UNIV, MEDFORD, MA 02155 USA. UNIV WISCONSIN, MADISON, WI 53706 USA. RP ABE, F (reprint author), NATL LAB HIGH ENERGY PHYS, OHO, IBARAKI 305, JAPAN. RI St.Denis, Richard/C-8997-2012; Chiarelli, Giorgio/E-8953-2012; Punzi, Giovanni/J-4947-2012; Kim, Soo-Bong/B-7061-2014 OI Chiarelli, Giorgio/0000-0001-9851-4816; Punzi, Giovanni/0000-0002-8346-9052; NR 20 TC 41 Z9 41 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 FEB 8 PY 1993 VL 70 IS 6 BP 713 EP 717 DI 10.1103/PhysRevLett.70.713 PG 5 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200004 ER PT J AU LUNG, A STUART, LM BOSTED, PE ANDIVAHIS, L ALSTER, J ARNOLD, RG CHANG, CC DIETRICH, FS DODGE, WR GEARHART, R GOMEZ, J GRIFFIOEN, KA HICKS, RS HYDEWRIGHT, CE KEPPEL, C KUHN, SE LICHTENSTADT, J MISKIMEN, RA PETERSON, GA PETRATOS, GG ROCK, SE ROKNI, SH SAKUMOTO, WK SPENGOS, M SWARTZ, K SZALATA, Z TAO, LH AF LUNG, A STUART, LM BOSTED, PE ANDIVAHIS, L ALSTER, J ARNOLD, RG CHANG, CC DIETRICH, FS DODGE, WR GEARHART, R GOMEZ, J GRIFFIOEN, KA HICKS, RS HYDEWRIGHT, CE KEPPEL, C KUHN, SE LICHTENSTADT, J MISKIMEN, RA PETERSON, GA PETRATOS, GG ROCK, SE ROKNI, SH SAKUMOTO, WK SPENGOS, M SWARTZ, K SZALATA, Z TAO, LH TI MEASUREMENTS OF THE ELECTRIC AND MAGNETIC FORM-FACTORS OF THE NEUTRON FROM Q(2)=1.75 TO 4.00 (GEV/C)(2) SO PHYSICAL REVIEW LETTERS LA English DT Article ID EXCLUSIVE PROCESSES; NUCLEON; DEUTERON; SCATTERING; TRANSFERS; DYNAMICS; MESON; MODEL AB Quasielastic e-d cross sections have been measured at forward and backward angles. Rosenbluth separations were done to obtain R(L) and R(T) at Q2 = 1.75, 2.50, 3.25, and 4.00 (GeV/c)2. The neutron form factors G(En) and G(Mn) have been extracted using a nonrelativistic model. The sensitivity to deuteron wave function, relativistic corrections, and models of the inelastic background are reported. The results for G(Mn) are consistent with the dipole form, while G(En) is consistent with zero. Comparisons are made to theoretical models based on vector meson dominance, perturbative QCD, and QCD sum rules, as well as constituent quarks. C1 AMERICAN UNIV,WASHINGTON,DC 20016. UNIV CALIF DAVIS,DAVIS,CA 95616. CEBAF,NEWPORT NEWS,VA 23606. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV MARYLAND,COLL PK,MD 20742. UNIV MASSACHUSETTS,AMHERST,MA 01003. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. UNIV PENN,PHILADELPHIA,PA 19104. UNIV ROCHESTER,ROCHESTER,NY 14627. STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. STANFORD UNIV,STANFORD,CA 94305. TEL AVIV UNIV,IL-69978 TEL AVIV,ISRAEL. UNIV WASHINGTON,SEATTLE,WA 98195. NR 22 TC 188 Z9 188 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 FEB 8 PY 1993 VL 70 IS 6 BP 718 EP 721 DI 10.1103/PhysRevLett.70.718 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200005 ER PT J AU ALVES, GA AMATO, S ANJOS, JC APPEL, JA BRACKER, SB CREMALDI, LM DARLING, CL DIXON, RL ERREDE, D FENKER, HC GAY, C GREEN, DR JEDICKE, R KAPLAN, D KARCHIN, PE KWAN, S LEEDOM, I LUEKING, LH LUSTE, GJ MANTSCH, PM NETO, JRTD METHENY, J MILBURN, RH DEMIRANDA, JM FILHO, HD NAPIER, A RAFATIAN, A DOSREIS, AC REUCROFT, S ROSS, WR SANTORO, FS SHEAFF, M SOUZA, MHG SPALDING, WJ STOUGHTON, C STREETMAN, ME SUMMERS, DJ TAKACH, SF WU, Z AF ALVES, GA AMATO, S ANJOS, JC APPEL, JA BRACKER, SB CREMALDI, LM DARLING, CL DIXON, RL ERREDE, D FENKER, HC GAY, C GREEN, DR JEDICKE, R KAPLAN, D KARCHIN, PE KWAN, S LEEDOM, I LUEKING, LH LUSTE, GJ MANTSCH, PM NETO, JRTD METHENY, J MILBURN, RH DEMIRANDA, JM FILHO, HD NAPIER, A RAFATIAN, A DOSREIS, AC REUCROFT, S ROSS, WR SANTORO, FS SHEAFF, M SOUZA, MHG SPALDING, WJ STOUGHTON, C STREETMAN, ME SUMMERS, DJ TAKACH, SF WU, Z TI ATOMIC MASS DEPENDENCE OF D(+/-) AND D(0),(D)OVER-BAR(0) PRODUCTION IN 250 GEV PI(+/-)-NUCLEON INTERACTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article AB We measure the relative cross sections for D mesons produced in interactions of pi- and pi+ beams with targets of Be, Cu, Al, and W. The measurement is based on 1400 fully reconstructed decays of the types D0 --> K-pi+, D+ --> K-pi+pi+, and charge conjugates. We find that the cross section for the production of both neutral and charged D's by either pi- or pi+ is well fitted by the form A(alpha) where A is the atomic mass and alpha = 1.00 +/- 0.05 +/- 0.02, where the errors are statistical and systematic, respectively. There is no significant dependence of alpha on the transverse or longitudinal momentum of the D meson or on the charge of either the incident pion or the produced D meson. C1 FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV MISSISSIPPI,OXFORD,MS 38677. NORTHEASTERN UNIV,BOSTON,MA 02115. UNIV TORONTO,TORONTO M5S 1A7,ONTARIO,CANADA. TUFTS UNIV,MEDFORD,MA 02155. UNIV WISCONSIN,MADISON,WI 53706. YALE UNIV,NEW HAVEN,CT 06511. RP ALVES, GA (reprint author), CTR BRASILEIRO PESQUISAS FIS,BR-20000 RIO JANEIRO,BRAZIL. RI Anjos, Joao/C-8335-2013; Alves, Gilvan/C-4007-2013; de Mello Neto, Joao/C-5822-2013 OI de Mello Neto, Joao/0000-0002-3234-6634 NR 7 TC 57 Z9 57 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 FEB 8 PY 1993 VL 70 IS 6 BP 722 EP 725 DI 10.1103/PhysRevLett.70.722 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200006 ER PT J AU GREEN, A UNKELBACH, W BAKER, FT BEATTY, D BIMBOT, L CHEN, XY CUPPS, VR DJALALI, C EDWARDS, G FERGERSON, RW GLASHAUSSER, C JONES, KW JONES, MK KUMBARTZKI, G SETHI, A STORM, B WAMBACH, J AF GREEN, A UNKELBACH, W BAKER, FT BEATTY, D BIMBOT, L CHEN, XY CUPPS, VR DJALALI, C EDWARDS, G FERGERSON, RW GLASHAUSSER, C JONES, KW JONES, MK KUMBARTZKI, G SETHI, A STORM, B WAMBACH, J TI SPIN-LONGITUDINAL AND SPIN-TRANSVERSE RESPONSE OF CA-40 TO 500 MEV PROTONS AT LOW MOMENTUM-TRANSFER SO PHYSICAL REVIEW LETTERS LA English DT Article ID INTERMEDIATE ENERGY PROTONS; SCATTERING; ENHANCEMENT; EXCITATIONS; EXCHANGE; NUCLEI AB A complete set of diagonal spin-transfer observables has been measured at excitation energies between 30 and 40 MeV for inelastic proton scattering from Ca-40 at 497 and 581 MeV at a momentum transfer of 0.56 fm-1. The longitudinal and transverse spin-flip probabilities are deduced. Their unequal enhancements relative to free nucleon-nucleon scattering values are explained by a distorted-wave impulse approximation calculation in which the finite nucleus random-phase approximation is used to describe the nuclear response. C1 RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. INDIANA UNIV,CTR NUCL THEORY,BLOOMINGTON,IN 47408. UNIV GEORGIA,ATHENS,GA 30602. INST PHYS NUCL,F-91406 ORSAY,FRANCE. UNIV COLORADO,BOULDER,CO 80309. UNIV S CAROLINA,COLUMBIA,SC 29208. UNIV MINNESOTA,MINNEAPOLIS,MN 55455. UNIV ILLINOIS,CHAMPAIGN,IL 61820. RP GREEN, A (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 28 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 8 PY 1993 VL 70 IS 6 BP 734 EP 737 DI 10.1103/PhysRevLett.70.734 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200009 ER PT J AU PINNADUWAGE, LA CHRISTOPHOROU, LG AF PINNADUWAGE, LA CHRISTOPHOROU, LG TI H- FORMATION IN LASER-EXCITED MOLECULAR-HYDROGEN SO PHYSICAL REVIEW LETTERS LA English DT Article ID ENHANCED ELECTRON-ATTACHMENT; DISSOCIATIVE ATTACHMENT; CROSS-SECTIONS; MULTIPHOTON IONIZATION; SUPEREXCITED STATES; 2-PHOTON EXCITATION; H-2; COLLISIONS; PHOTOELECTRON; IONS AB Experimental evidence is reported for the efficient H- formation in UV laser irradiated H-2. C1 UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. RP PINNADUWAGE, LA (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,ATOM MOLEC & HIGH VOLTAGE PHYS GRP,OAK RIDGE,TN 37831, USA. NR 34 TC 53 Z9 53 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 FEB 8 PY 1993 VL 70 IS 6 BP 754 EP 757 DI 10.1103/PhysRevLett.70.754 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200014 ER PT J AU BARTON, AS BOGORAD, P CATES, GD MABUCHI, H MIDDLETON, H NEWBURY, NR HOLMES, R MCCRACKEN, J SOUDER, PA XU, J TUPA, D AF BARTON, AS BOGORAD, P CATES, GD MABUCHI, H MIDDLETON, H NEWBURY, NR HOLMES, R MCCRACKEN, J SOUDER, PA XU, J TUPA, D TI HIGHLY POLARIZED MUONIC HE PRODUCED BY COLLISIONS WITH LASER OPTICALLY PUMPED RB SO PHYSICAL REVIEW LETTERS LA English DT Article ID SPIN-EXCHANGE; CHARGE-EXCHANGE; CROSS-SECTIONS; HIGH-DENSITY; HELIUM ATOM; HYDROGEN; MOLECULES; TARGETS; IONS AB We have formed highly polarized muonic helium by stopping unpolarized negative muons in a mixture of unpolarized gaseous He and laser polarized Rb vapor. The stopped muons form muonic He ions which are neutralized and polarized by collisions with Rb. Average polarizations for He-3 and He-4 of (26.8+/-2.3)% and (44.2+/-3.5)% were achieved, representing a tenfold increase over previous methods. Relevant cross sections were determined from the time evolution of the polarization. Highly polarized muonic He is valuable for measurements of the induced pseudoscalar coupling g(p) in nuclear muon capture. C1 SYRACUSE UNIV,DEPT PHYS,SYRACUSE,NY 13244. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP BARTON, AS (reprint author), PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544, USA. NR 39 TC 9 Z9 9 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 FEB 8 PY 1993 VL 70 IS 6 BP 758 EP 761 DI 10.1103/PhysRevLett.70.758 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200015 ER PT J AU TURNER, L BARNES, DC AF TURNER, L BARNES, DC TI BRILLOUIN LIMIT AND BEYOND - A ROUTE TO INERTIAL-ELECTROSTATIC CONFINEMENT OF A SINGLE-SPECIES PLASMA SO PHYSICAL REVIEW LETTERS LA English DT Article AB The physics limiting the density of a cold non-neutral plasma is presented. It is shown that when a flow has no strain, the instantaneous maximum number of charges that can be stored within a fixed boundary is equal to the total magnetic field energy within divided by the relativistic rest energy of a single charge. A higher limit can be supported by the presence of a deviatoric strain in the flow. Brillouin flow equilibria with arbitrarily high values of the Brillouin ratio, leading to the possibility of pure inertial-electrostatic confinement of non-neutral plasmas, are demonstrated. RP TURNER, L (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 8 TC 14 Z9 14 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 FEB 8 PY 1993 VL 70 IS 6 BP 798 EP 801 DI 10.1103/PhysRevLett.70.798 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200025 ER PT J AU BATHA, SH BRADLEY, KS BALDIS, HA DRAKE, RP ESTABROOK, K JOHNSTON, TW MONTGOMERY, DS AF BATHA, SH BRADLEY, KS BALDIS, HA DRAKE, RP ESTABROOK, K JOHNSTON, TW MONTGOMERY, DS TI OBSERVATION OF NEAR-FORWARD STIMULATED BRILLOUIN-SCATTERING FROM A LASER-PRODUCED PLASMA SO PHYSICAL REVIEW LETTERS LA English DT Article ID LIGHT; RAMAN AB The first experimental measurements of near-forward scattering from a plasma at wavelengths near the pump wavelength are presented. Simultaneous, time-resolved spectra from several oblique forward angles show the characteristic wavelength shift associated with scattering from an ion wave. Energy measurements show that forward scattering is stronger than backscattering. The angular distribution of forward scattered energy is in qualitative agreement with the simple convective-instability theory of stimulated Brillouin scattering. C1 UNIV CALIF DAVIS,PLASMA PHYS RES INST,DAVIS,CA 95616. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV CALIF DAVIS,DEPT APPL SCI,DAVIS,CA 95616. INST NATL RECH SCI ENERGIE VARENNES,VARENNES J3X 1S2,PQ,CANADA. RI Drake, R Paul/I-9218-2012; OI Drake, R Paul/0000-0002-5450-9844; Montgomery, David/0000-0002-2355-6242 NR 19 TC 11 Z9 11 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 8 PY 1993 VL 70 IS 6 BP 802 EP 805 DI 10.1103/PhysRevLett.70.802 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200026 ER PT J AU SCHIFFER, JP AF SCHIFFER, JP TI PHASE-TRANSITIONS IN ANISOTROPICALLY CONFINED IONIC-CRYSTALS SO PHYSICAL REVIEW LETTERS LA English DT Article ID LASER-COOLED IONS AB Crystalline, confined ionic systems exhibit well defined phase transitions as a function of the anisotropy of the confining potential. The transitions from one to two dimensions, from two to three, and back from three to two have been investigated as a function of this ansiotropy with molecular dynamics simulations. The anisotropy at which such transitions occur seems to be proportional to a power of the number of confined ions. C1 UNIV CHICAGO,CHICAGO,IL 60637. RP SCHIFFER, JP (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 13 TC 137 Z9 137 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 FEB 8 PY 1993 VL 70 IS 6 BP 818 EP 821 DI 10.1103/PhysRevLett.70.818 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200030 ER PT J AU ETTERS, RD KUCHTA, B BELAK, J AF ETTERS, RD KUCHTA, B BELAK, J TI VACANCY-INDUCED MELTING OF N2 ADLAYERS ON GRAPHITE SO PHYSICAL REVIEW LETTERS LA English DT Article ID N-2 MONOLAYERS; PHASE-DIAGRAM; MONTE-CARLO; TRANSITION AB The remarkable melting behavior of partial and complete N2 monolayers deposited on graphite is examined using a Monte Carlo procedure in which various concentrations of vacancies are introduced. The calculated melting temperatures and specific heats are in agreement with experiment over the surface density range 0.2 less-than-or-equal-to rho less-than-or-equal-to 1, where the upper limit is the density of the observed square-root 3 x square-root 3 monolayer structure. Various physical quantities are calculated, and the nature of the transition is discussed. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP ETTERS, RD (reprint author), COLORADO STATE UNIV,DEPT PHYS,FT COLLINS,CO 80523, USA. RI Kuchta, Bogdan/I-6471-2015 OI Kuchta, Bogdan/0000-0002-8635-4154 NR 16 TC 24 Z9 24 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 8 PY 1993 VL 70 IS 6 BP 826 EP 829 DI 10.1103/PhysRevLett.70.826 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200032 ER PT J AU YETHIRAJ, M MOOK, HA WIGNALL, GD CUBITT, R FORGAN, EM PAUL, DM ARMSTRONG, T AF YETHIRAJ, M MOOK, HA WIGNALL, GD CUBITT, R FORGAN, EM PAUL, DM ARMSTRONG, T TI SMALL-ANGLE NEUTRON-SCATTERING STUDY OF FLUX LINE LATTICES IN TWINNED YBA2CU3O7 SO PHYSICAL REVIEW LETTERS LA English DT Article ID SINGLE-CRYSTAL YBA2CU3O7-DELTA; MAGNETIC PENETRATION DEPTH; DIFFRACTION AB A small-angle neutron study of vortex lattices in YBa2Cu3O7 showed a diffraction pattern with square symmetry when the applied field was along the c axis with the four main spots aligned with the crystallographic {110} directions. With the field 30-degrees from the c axis, a hexagonal lattice exists. At intermediate angles, a fraction of the flux lines follow the c axis and the two lattices coexist. The temperature dependence of the intensity deviates markedly from conventional predictions. C1 UNIV BIRMINGHAM,SUPERCONDUCT RES GRP,BIRMINGHAM B15 2TT,W MIDLANDS,ENGLAND. UNIV WARWICK,DEPT PHYS,COVENTRY CV4 7AL,W MIDLANDS,ENGLAND. ALLIED SIGNAL RES LABS,TORRANCE,CA 90509. RP YETHIRAJ, M (reprint author), OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831, USA. RI cubitt, robert/B-9408-2008; OI Wignall, George/0000-0002-3876-3244 NR 13 TC 70 Z9 70 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 FEB 8 PY 1993 VL 70 IS 6 BP 857 EP 860 DI 10.1103/PhysRevLett.70.857 PG 4 WC Physics, Multidisciplinary SC Physics GA KK812 UT WOS:A1993KK81200040 ER PT J AU CHRISTENSEN, RM AF CHRISTENSEN, RM TI EFFECTIVE PROPERTIES OF COMPOSITE-MATERIALS CONTAINING VOIDS SO PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Note AB Recent results of theoretical and practical importance prove that the two-dimensional (in-plane) effective (average) Young's modulus for an isotropic elastic material containing voids is independent of the Poisson's ratio of the matrix material. This result is true regardless of the shape and morphology of the voids so long as isotropy is maintained. The present work uses this proof to obtain explicit analytical forms for the effective Young's modulus property, forms which simplify greatly because of this characteristic. In some cases, the optimal morphology for the voids can be identified, giving the shapes of the voids. at fixed volume, that maximize the effective Young's modulus in the two-dimensional situation. Recognizing that two-dimensional isotropy is a subset of three-dimensional transversely isotropic media, it is shown in this more general case that three of the five properties independent of Poisson's ratio, leaving only two that depend upon it. For three-dimensionally isotropic composite media containing voids, it is shown that a somewhat comparable situation exists whereby the three-dimensional Young's modulus is insensitive to variations in Poisson's ratio, nu(m), over the range 0 less-than-or-equal-to nu(m) less-than-or-equal-to 1/2. although the same is not true for negative values of nu(m). This further extends the practical usefulness of the two-dimensional result to three-dimensional conditions for realistic values of nu(m). C1 LAWRENCE LIVERMORE NATL LAB,DEPT APPL SCI,LIVERMORE,CA 94550. RP CHRISTENSEN, RM (reprint author), LAWRENCE LIVERMORE NATL LAB,DEPT CHEM & MAT SCI,LIVERMORE,CA 94550, USA. NR 12 TC 56 Z9 56 U1 2 U2 10 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 1364-5021 J9 P ROY SOC LOND A MAT JI Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci. PD FEB 8 PY 1993 VL 440 IS 1909 BP 461 EP 473 DI 10.1098/rspa.1993.0027 PG 13 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KM381 UT WOS:A1993KM38100015 ER PT J AU KOUZES, RT AF KOUZES, RT TI HOT PAPERS - ASTROPHYSICS - SEARCH FOR NEUTRINOS FROM THE SUN USING THE REACTION GA-71(NU-E,E-)GE-71 BY ABAZOV,A.I., ANOSOV,O.L., FAIZOV,E.L., GAVRIN,V.N. SO SCIENTIST LA English DT Article AB HOT PAPERS: An astrophysicist discusses solar neutrinos. RP KOUZES, RT (reprint author), PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD FEB 8 PY 1993 VL 7 IS 3 BP 16 EP 16 PG 1 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA KK534 UT WOS:A1993KK53400015 ER PT J AU PARISE, JB HRILJAC, JA COX, DE CORBIN, DR RAMAMURTHY, V AF PARISE, JB HRILJAC, JA COX, DE CORBIN, DR RAMAMURTHY, V TI A HIGH-RESOLUTION SYNCHROTRON X-RAY-POWDER DIFFRACTION STUDY OF TRANS-STILBENE IN ZEOLITE ZSM-5 SO JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS LA English DT Article ID PHOTOCHEMICAL REACTIVITY; SPECTROSCOPIC CHARACTERIZATION; PENTASIL ZEOLITES; SYMMETRY; CHANNELS; CRYSTAL AB Upon adsorption of two molecules of stilbene per unit cell, the apparent symmetry of ZSM-5 changes to tetragonal, but the true symmetry is orthorhombic with a very small difference between a and b, which becomes progressively more pronounced with b > a as the sample is cooled to 25 K; the stilbene molecule is located in the straight channels, with one phenyl ring on the mirror plane, at the intersection of the straight and sinusoidal channels. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. DUPONT CO,CENT RES & DEV,WILMINGTON,DE 19880. RP PARISE, JB (reprint author), SUNY STONY BROOK,STONY BROOK,NY 11794, USA. NR 14 TC 27 Z9 27 U1 1 U2 4 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0022-4936 J9 J CHEM SOC CHEM COMM JI J. Chem. Soc.-Chem. Commun. PD FEB 7 PY 1993 IS 3 BP 226 EP 228 DI 10.1039/c39930000226 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA KL904 UT WOS:A1993KL90400008 ER PT J AU FISHMAN, MA PERELSON, AS AF FISHMAN, MA PERELSON, AS TI MODELING T-CELL-ANTIGEN PRESENTING CELL-INTERACTIONS SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article ID STEADY-STATE ASSUMPTION; LYMPH DENDRITIC CELLS; IMMUNE-RESPONSES; LEISHMANIA-MAJOR; LYMPHOCYTES-T; INTERLEUKIN-2; INFECTION; RECEPTORS; PARASITE C1 LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545. RP FISHMAN, MA (reprint author), WEIZMANN INST SCI,DEPT APPL MATH & COMP SCI,IL-76100 REHOVOT,ISRAEL. FU NIAID NIH HHS [AI28433] NR 43 TC 28 Z9 30 U1 0 U2 1 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD FEB 7 PY 1993 VL 160 IS 3 BP 311 EP 342 DI 10.1006/jtbi.1993.1021 PG 32 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA KR235 UT WOS:A1993KR23500003 PM 8501913 ER PT J AU SUESS, ST MCCOMAS, DJ HOEKSEMA, JT AF SUESS, ST MCCOMAS, DJ HOEKSEMA, JT TI PREDICTION OF THE HELIOSPHERIC CURRENT SHEET TILT - 1992-1996 SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID MAGNETIC-FIELD; SOLAR; EVOLUTION AB Heliospheric current sheet tilt evolves systematically over the solar cycle. Here we show that this evolution is different than the sunspot cycle and that tilt for the period 1992 - 1996 can be predicted using persistence. That is, the tilt over the coming cycle will be the same as for the past cycle. The Ulysses spacecraft has passed Jupiter and is moving out of the plane of the ecliptic, so we use the prediction of the changing heliospheric current sheet tilt to predict that Ulysses will pass beyond the envelope, or maximum latitude, of the heliospheric current sheet in November 1993. C1 STANFORD UNIV,CTR SPACE SCI ASTROPHYS,STANFORD,CA 94305. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SUESS, ST (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,ES52,HUNTSVILLE,AL 35812, USA. NR 10 TC 25 Z9 25 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 FEB 5 PY 1993 VL 20 IS 3 BP 161 EP 164 DI 10.1029/93GL00078 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KM058 UT WOS:A1993KM05800001 ER PT J AU STURGES, WT SCHNELL, RC DUTTON, GS GARCIA, SR LIND, JA AF STURGES, WT SCHNELL, RC DUTTON, GS GARCIA, SR LIND, JA TI SPRING MEASUREMENTS OF TROPOSPHERIC BROMINE AT BARROW, ALASKA SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID OZONE DESTRUCTION AB The partitioning of bromine in the lower troposphere between particulate, inorganic gaseous, and organic gaseous phases was measured during the arctic spring. Rapid photochemical production of particulate Br- from organic gaseous Br was indicated by 1) an inverse correlation between particulate bromide and organic gaseous bromine (r2=-0.67), 2) a diurnal cycle in the ratio of these two phases, and 3) a diurnal cycle in the ratio of organic gaseous Br to Cl. Organic gaseous Br and Cl were correlated (r2=0.67) indicating a common, possibly marine, source. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NATL CTR ATMOSPHER RES,BOULDER,CO 80307. RP STURGES, WT (reprint author), UNIV COLORADO,NOAA,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309, USA. NR 9 TC 15 Z9 15 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 FEB 5 PY 1993 VL 20 IS 3 BP 201 EP 204 DI 10.1029/92GL01885 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KM058 UT WOS:A1993KM05800011 ER PT J AU CHARTON, F JACOSON, SC GUIOCHON, G AF CHARTON, F JACOSON, SC GUIOCHON, G TI MODELING OF THE ADSORPTION BEHAVIOR AND THE CHROMATOGRAPHIC BAND PROFILES OF ENANTIOMERS - BEHAVIOR OF METHYL MANDELATE ON IMMOBILIZED CELLULOSE SO JOURNAL OF CHROMATOGRAPHY LA English DT Article ID CHIRAL STATIONARY PHASES; PREPARATIVE LIQUID-CHROMATOGRAPHY; OPTICAL RESOLUTION; ISOTHERM; OPTIMIZATION; DERIVATIVES; SIMULATION; PREDICTION AB The adsorption isotherms of (-)- and (+)-methyl mandelate from a hexane-isopropanol (90:10) solution were measured on a chromatographic column packed with 4-methylcellulose tribenzoate coated on silica. These isotherms are accounted for by a bi-Langmuir isotherm model, the two Langmuir terms having widely different initial slopes and saturation capacities, but each term having the same saturation capacity for the two enantiomers. The competitive isotherms were also measured. They are in excellent agreement with the prediction of a competitive bi-Langmuir model based on the single-component isotherms. The individual band profiles are in agreement with the profiles calculated from these isotherms. Thus, a simplified competitive isotherm can be used to model a separation on a chiral stationary phase the recognition mechanism of which is not well identified and the adsorption behavior of which is certainly not ideal. C1 UNIV TENNESSEE,DEPT CHEM,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. NR 43 TC 33 Z9 34 U1 1 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0021-9673 J9 J CHROMATOGR PD FEB 5 PY 1993 VL 630 IS 1-2 BP 21 EP 35 DI 10.1016/0021-9673(93)80439-F PG 15 WC Chemistry, Analytical SC Chemistry GA KL947 UT WOS:A1993KL94700002 ER PT J AU TOLLESTRUP, AV AF TOLLESTRUP, AV TI BIG PHYSICS AND NEW IDEAS SO SCIENCE LA English DT Letter RP TOLLESTRUP, AV (reprint author), FERMILAB NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD FEB 5 PY 1993 VL 259 IS 5096 BP 747 EP 747 DI 10.1126/science.259.5096.747 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KL110 UT WOS:A1993KL11000004 PM 17809323 ER PT J AU BERMAN, A HANSON, J LEISEROWITZ, L KOETZLE, TF WEINER, S ADDADI, L AF BERMAN, A HANSON, J LEISEROWITZ, L KOETZLE, TF WEINER, S ADDADI, L TI BIOLOGICAL-CONTROL OF CRYSTAL TEXTURE - A WIDESPREAD STRATEGY FOR ADAPTING CRYSTAL PROPERTIES TO FUNCTION SO SCIENCE LA English DT Article ID CALCITE; PROTEINS AB Textures of calcite crystals from a variety of mineralized tissues belonging to organisms from four phyla were examined with high-resolution synchrotron x-ray radiation Significant differences in coherence length and angular spread were observed between taxonomic groups. Crystals from polycrystalline skeletal ensembles were more perfect than those that function as single-crystal elements. Different anisotropic effects on crystal texture were observed for sea urchin and mollusk calcite crystals, whereas none was found for the foraminifer, Patellina, and the control calcite crystals. These results show that the manipulation of crystal texture in different organisms is under biological control and that crystal textures in some tissues are adapted to function. A better understanding of this apparently widespread biological phenomenon may provide new insights for improving synthetic crystal-containing materials. C1 WEIZMANN INST SCI, DEPT MAT & INTERFACES, IL-76100 REHOVOT, ISRAEL. BROOKHAVEN NATL LAB, DEPT CHEM, UPTON, NY 11973 USA. RP BERMAN, A (reprint author), WEIZMANN INST SCI, DEPT STRUCT BIOL, IL-76100 REHOVOT, ISRAEL. RI Hanson, jonathan/E-3517-2010; Berman, Amir/F-1870-2012 NR 32 TC 293 Z9 302 U1 2 U2 59 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD FEB 5 PY 1993 VL 259 IS 5096 BP 776 EP 779 DI 10.1126/science.259.5096.776 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KL110 UT WOS:A1993KL11000021 PM 17809339 ER PT J AU CHUNG, HH BENSON, DR SCHULTZ, PG AF CHUNG, HH BENSON, DR SCHULTZ, PG TI PROBING THE STRUCTURE AND MECHANISM OF RAS PROTEIN WITH AN EXPANDED GENETIC-CODE SO SCIENCE LA English DT Article ID SITE-SPECIFIC INCORPORATION; UNNATURAL AMINO-ACIDS; TRIPHOSPHATE CONFORMATION; BIOCHEMICAL-PROPERTIES; CATALYTIC DOMAIN; GTP HYDROLYSIS; TRANSFER-RNAS; P21; PRODUCT; MUTANTS AB Mutations in Ras protein at positions Gly12 and Gly13 (phosphate-binding loop L1) and at positions Ala59, Gly60, and Gln61 (loop L4) are commonly associated with oncogenic activation. The structural and catalytic roles of these residues were probed with a series of unnatural amino acids that have unusual main chain conformations, hydrogen bonding abilities, and steric features. The properties of wild-type and transforming Ras proteins previously thought to be uniquely associated with the structure of a single amino acid at these positions were retained by mutants that contained a variety of unnatural amino acids. This expanded set of functional mutants provides new insight into the role of loop L4 residues in switch function and suggests that loop L1 may participate in the activation of Ras protein by effector molecules. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,CTR ADV MAT,DIV MAT SCI,BERKELEY,CA 94720. FU NIGMS NIH HHS [F32 GM14165] NR 45 TC 118 Z9 118 U1 0 U2 13 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD FEB 5 PY 1993 VL 259 IS 5096 BP 806 EP 809 DI 10.1126/science.8430333 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KL110 UT WOS:A1993KL11000031 PM 8430333 ER PT J AU CARTER, PW DIMAGNO, SG PORTER, JD STREITWIESER, A AF CARTER, PW DIMAGNO, SG PORTER, JD STREITWIESER, A TI PI-STACKING AND AGGREGATION OF PYRIDINIUM-SUBSTITUTED INDOLIZINES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SELF-ASSOCIATION; DEPENDENT FLUORESCENCE; GROUND-STATES; DYES; DIMERIZATION; MOLECULES; RADICALS; DIMERS; WATER; IONS AB The tendency for pyridinium-substituted indolizines to aggregate in aqueous and acetonitrile solution is dominated by solute-solvent interactions and by the amphiphilic nature of the cations. In solution, these compounds exhibit an unusual sequence of discrete, red-shifted fluorescence bands whose intensities are a function of concentration over the range 10(-5)-10(-3) M. It is proposed that pi-stacking of the indolizine residues results in weak electronic interactions (beta approximately 0.13 eV) which are sufficient to result in the delocalization of bound excitonic states over the aggregate. Fluorescence from the aggregate occurs by radiative annihilation of the delocalized exciton. Stepwise dimerization (K2) and trimerization (K3) equilibrium constants for the cations calculated from the emission spectra range from about 400 to 65 000. Solution conductivity measurements indicate that cation aggregation does not require ion pairing. However, where significant ion-pairing does occur, K2 and K3 are increased by at least an order of magnitude. X-ray crystallography was used to determine the structures of cation dimers which form in the solid state, and these structures were used as working models for the geometry of the solution aggregates. Electrostatic and dispersion interactions calculated on the basis of those geometries account for some of the free energy of aggregate formation, but solvent entropic effects are believed to provide the strongest driving force for indolizine aggregation in solution. C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. RI DiMagno, Stephen/H-9459-2016 OI DiMagno, Stephen/0000-0001-7861-4799 NR 58 TC 17 Z9 18 U1 0 U2 7 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 FEB 4 PY 1993 VL 97 IS 5 BP 1085 EP 1096 DI 10.1021/j100107a017 PG 12 WC Chemistry, Physical SC Chemistry GA KL150 UT WOS:A1993KL15000017 ER PT J AU COLEMAN, ML HEDRICK, DB LOVLEY, DR WHITE, DC PYE, K AF COLEMAN, ML HEDRICK, DB LOVLEY, DR WHITE, DC PYE, K TI REDUCTION OF FE(III) IN SEDIMENTS BY SULFATE-REDUCING BACTERIA SO NATURE LA English DT Article ID FATTY-ACID; FERRIC IRON; SULFATE AB REDUCTION of ferric iron (Fe(III)) to ferrous iron (Fe(II)) is one of the most important geochemical reactions in anaerobic aquatic sediments because of its many consequences for the organic and inorganic chemistry of these environments1. In marine environments, sulphate-reducing bacteria produce H2S, which can reduce iron oxyhydroxides2 to form iron sulphides. The presence of siderite (FeCO3) in marine sediments is anomalous, however, as it is unstable in the presence of H2S. Previous work3,4 has suggested a bacterial origin of siderite. Here we describe geochemical and microbiological studies which suggest that contemporary formation of siderite concretions in a salt-marsh sediment results from the activity of sulphate-reducing bacteria. We find that, instead of reducing Fe(III) indirectly through the production of sulphide, some of these bacteria can reduce Fe(III) directly through an enzymatic mechanism, producing siderite rather than iron sulphides. Sulphate-reducing bacteria may thus be an important and previously unrecognized agent for Fe(III) reduction in aquatic sediments and ground waters. C1 BP RES & ENGN CTR,SUNBURY TW16 7LN,MIDDX,ENGLAND. UNIV TENNESSEE,CTR ENVIRONM BIOTECHNOL,KNOXVILLE,TN 37932. US GEOL SURVEY,DIV WATER RESOURCES,RESTON,VA 22092. UNIV TENNESSEE,DEPT MICROBIOL,KNOXVILLE,TN 37996. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP COLEMAN, ML (reprint author), UNIV READING,POSTGRAD RES INST SEDIMENTOL,WHITEKNIGHTS,POB 227,READING RG6 2AB,BERKS,ENGLAND. RI Coleman, Max/A-1303-2007 OI Coleman, Max/0000-0002-5514-1826 NR 25 TC 301 Z9 314 U1 8 U2 98 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD FEB 4 PY 1993 VL 361 IS 6411 BP 436 EP 438 DI 10.1038/361436a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KK713 UT WOS:A1993KK71300055 ER PT J AU GRONAU, M AF GRONAU, M TI LARGE PENGUIN EFFECTS IN THE CP ASYMMETRY OF B-D(0)-]PI+PI- SO PHYSICS LETTERS B LA English DT Article ID NON-LEPTONIC DECAYS; NEUTRAL-B-DECAYS; ISOSPIN ANALYSIS; MESON DECAYS; VIOLATION AB Penguin effects in the CP asymmetries of B(d)0 --> pi+pi-, B(d)0 --> rho+/-pi-/+ and B(d)0 --> a(l)+/-pi-/+ are studied as function of the CKM unitarity triangle alpha. Despite a fairly small penguin amplitude, it leads to quite sizeable uncertainties in the determination of sin 2alpha from all but very large asymmetries. This effect is maximal for vanishing final state interaction phases, for which it can cause, for instance, an asymmetry of 40% if alpha = pi/2. RP GRONAU, M (reprint author), STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309, USA. NR 31 TC 76 Z9 76 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 FEB 4 PY 1993 VL 300 IS 1-2 BP 163 EP 168 DI 10.1016/0370-2693(93)90765-A PG 6 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KL035 UT WOS:A1993KL03500028 ER PT J AU FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARREN, L GARBINCIUS, PH GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C DIAFERIA, R GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F FILASETTA, JF BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY AF FRABETTI, PL CHEUNG, HWK CUMALAT, JP DALLAPICCOLA, C GINKEL, JF GREENE, SV JOHNS, WE NEHRING, MS BUTLER, JN CIHANGIR, S GAINES, I GARREN, L GARBINCIUS, PH GOURLAY, SA HARDING, DJ KASPER, P KREYMER, A LEBRUN, P SHUKLA, S BIANCO, S FABBRI, FL SARWAR, S ZALLO, A CULBERTSON, R GARDNER, RW GREENE, R WISS, J ALIMONTI, G BELLINI, G CACCIANIGA, B CINQUINI, L DICORATO, M GIAMMARCHI, M INZANI, P LEVERARO, F MALVEZZI, S MENASCE, D MERONI, E MORONI, L PEDRINI, D PERASSO, L SALA, A SALA, S TORRETTA, D VITTONE, M BUCHHOLZ, D CLAES, D GOBBI, B OREILLY, B BISHOP, JM CASON, NM KENNEDY, CJ KIM, GN LIN, TF PUSELJIC, DL RUCHTI, RC SHEPHARD, WD SWIATEK, JA WU, ZY ARENA, V BOCA, G CASTOLDI, C DIAFERIA, R GIANINI, G RATTI, SP RICCARDI, C VITULO, P LOPEZ, A GRIM, GP PAOLONE, VS YAGER, PM WILSON, JR SHELDON, PD DAVENPORT, F FILASETTA, JF BLACKETT, GR PISHARODY, M HANDLER, T CHEON, BG KANG, JS KIM, KY TI 1ST EVIDENCE OF OMEGA-C(0)-] OMEGA-PI+ SO PHYSICS LETTERS B LA English DT Article ID QUARK-MODEL; HADRON MASSES; BARYONS AB We report evidence of a narrow resonance at a mass of 2705.9+/-3.3+/-2.0 MeV/c2 in the final state OMEGA-pi+ and the charge conjugate. The mass and width support the interpretation of a weakly decaying doubly strange charmed baryon, the OMEGA(c)0. Limits on the relative branching ratios for OMEGA(c)0 --> XI-K-pi+pi+ and OMEGA(c)0 --> OMEGA-pi-pi+pi+ are also presented. C1 INFN,I-40126 BOLOGNA,ITALY. UNIV COLORADO,BOULDER,CO 80309. FERMILAB NATL ACCELERATOR LAB,BATAVIA,IL 60510. INFN,LAB NAZL FRASCATI,I-00044 FRASCATI,ITALY. INFN,I-20133 MILAN,ITALY. UNIV MILAN,DIPARTIMENTO FIS,I-20133 MILAN,ITALY. NORTHWESTERN UNIV,EVANSTON,IL 60208. UNIV NOTRE DAME,NOTRE DAME,IN 46556. UNIV PAVIA,DIPARTIMENTO FIS,I-27100 PAVIA,ITALY. INFN,I-27100 PAVIA,ITALY. UNIV PUERTO RICO,MAYAGUEZ,PR 00708. UNIV CALIF DAVIS,DAVIS,CA 95616. UNIV S CAROLINA,COLUMBIA,SC 29208. VANDERBILT UNIV,NASHVILLE,TN 37235. UNIV N CAROLINA,ASHEVILLE,NC 28804. UNIV TENNESSEE,KNOXVILLE,TN 37996. KOREA UNIV,SEOUL 13670,SOUTH KOREA. NO KENTUCKY UNIV,HIGHLAND HTS,KY 41076. RP FRABETTI, PL (reprint author), UNIV BOLOGNA,DIPARTIMENTO FIS,I-40126 BOLOGNA,ITALY. NR 12 TC 30 Z9 30 U1 0 U2 3 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 FEB 4 PY 1993 VL 300 IS 1-2 BP 190 EP 194 DI 10.1016/0370-2693(93)90769-E PG 5 WC Astronomy & Astrophysics; Physics, Nuclear; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KL035 UT WOS:A1993KL03500032 ER PT J AU TALUKDAR, SC DETONI, B MARCANO, F SWEENEY, J RANGEL, A AF TALUKDAR, SC DETONI, B MARCANO, F SWEENEY, J RANGEL, A TI UPPER CRETACEOUS SOURCE ROCKS OF NORTHERN SOUTH-AMERICA SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 DGSI,THE WOODLANDS,TX. INTEVEP SA,LOS TEQUES,VENEZUELA. LLNL,LIVERMORE,CA. ICP,BUCARAMANGA,COLOMBIA. NR 0 TC 2 Z9 2 U1 1 U2 2 PU AMER ASSOC PETROLEUM GEOLOGIST 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 FEB PY 1993 VL 77 IS 2 BP 351 EP 351 PG 1 WC Geosciences, Multidisciplinary SC Geology GA KL722 UT WOS:A1993KL72200219 ER PT J AU NEUMARK, DM AF NEUMARK, DM TI TRANSITION-STATE SPECTROSCOPY VIA NEGATIVE-ION PHOTODETACHMENT SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Review ID QUANTUM REACTIVE SCATTERING; POTENTIAL-ENERGY SURFACE; PHOTOELECTRON-SPECTRUM; COLLINEAR I+HI; DYNAMICS; COLLISION; FEMTOCHEMISTRY; PROBABILITIES; MOLECULES; REGION C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP NEUMARK, DM (reprint author), UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720, USA. RI Neumark, Daniel/B-9551-2009 OI Neumark, Daniel/0000-0002-3762-9473 NR 53 TC 162 Z9 162 U1 3 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0001-4842 J9 ACCOUNTS CHEM RES JI Accounts Chem. Res. PD FEB PY 1993 VL 26 IS 2 BP 33 EP 39 DI 10.1021/ar00026a001 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA KM450 UT WOS:A1993KM45000001 ER PT J AU MCMULLAN, RK KVICK, A POPELIER, P AF MCMULLAN, RK KVICK, A POPELIER, P TI STRUCTURES OF CUBIC AND ORTHORHOMBIC PHASES OF ACETYLENE BY SINGLE-CRYSTAL NEUTRON-DIFFRACTION (ACTA CRYST, VOL B49, PG 145, 1993) SO ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE LA English DT Correction, Addition AB An error in technical editing is corrected. In the paper by McMullan, Kvick & Popelier [Acta Cryst. (1992), B48, 726-731], the crystal classes of acetylene (C2H2) at 131 and 141 K and deuteroacetylene (C2D2) at 143 and 15 K are given incorrectly. The correct assignments are: acetylene is cubic at 131 and 141 K, and deuteroacetylene is cubic at 143 K and orthorhombic at 15 K. C1 UNIV INSTELLING ANTWERP,DEPT CHEM,B-2610 WILRIJK,BELGIUM. RP MCMULLAN, RK (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 1 TC 0 Z9 0 U1 0 U2 3 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7681 J9 ACTA CRYSTALLOGR B JI Acta Crystallogr. Sect. B-Struct. Commun. PD FEB 1 PY 1993 VL 49 BP 145 EP 145 DI 10.1107/S0108768192012564 PN 1 PG 1 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA KM629 UT WOS:A1993KM62900018 ER PT J AU PERRY, KE MAY, GB EPSTEIN, JS OKADA, H ATLURI, SN AF PERRY, KE MAY, GB EPSTEIN, JS OKADA, H ATLURI, SN TI EXPERIMENTAL R-CURVE BEHAVIOR IN PARTIALLY-STABILIZED ZIRCONIA USING MOIRE INTERFEROMETRY SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID CERAMICS AB Moire interferometry is employed to study toughening in partially stabilized zirconia (PSZ). Energy to fracture as a function of crack growth curves (R-curves) is derived from mode I compliance calculations and from near tip fitting of the moire fringes. The effect of the tetragonal to monoclinic phase transformation in the zirconia is found by comparing the bulk compliance R-curves to the locally derived moire R-curve. Localized strain field plots are produced from the moire data for the PSZ zirconia. The observed transformation zone height compares favorably with that predicted by Okada et al. [Acta metall. mater. 40, 1421 (1992)] in a companion paper, as does the qualitative nature of the R-curve with predictions by Stump and Budiansky [Acta metall. 37, 3297 (1989)]. C1 IDAHO NATL ENGN LAB, FRACTURE BEHAV SECT, IDAHO FALLS, ID 83415 USA. GEORGIA INST TECHNOL, CTR COMP MODELLING & INFRASTRUCT REHABIL, ATLANTA, GA 30332 USA. RP PERRY, KE (reprint author), UNIV STRATHCLYDE, DEPT PROC & MECH ENGN, STRATHCLYDE G1 1XJ, SCOTLAND. RI Atluri, Satya/C-5040-2013 OI Atluri, Satya/0000-0001-6793-9619 NR 14 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD FEB PY 1993 VL 41 IS 2 BP 361 EP 368 DI 10.1016/0956-7151(93)90066-2 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KK907 UT WOS:A1993KK90700004 ER PT J AU CHADWICK, MM PETROVIC, JJ DANFORTH, SC MITCHELL, TE AF CHADWICK, MM PETROVIC, JJ DANFORTH, SC MITCHELL, TE TI TOPOTACTIC GROWTH OF SI2ON2 ON SIC SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID CERAMIC MATRIX COMPOSITES; BEHAVIOR AB Specimens consisting of a SiC single crystal imbedded in Si3N4 powder have been prepared by hot isostatic pressing at 1950-degrees-C and then examined by transmission electron microscopy. Columnar grains of orthorhombic Si2ON2 are observed in the interface region between the alpha SiC crystal and the polycrystalline Si3N4. The Si2ON2 is thought to form during cooling by crystallization from a Si-O-N-C liquid phase. The liquid phase results from dissolution of the constituent phases by the SiO2 present on the powder and crystal surfaces. The Si2ON2 is also found to grow topotactically on the SiC with two orientation relationships. In both cases, [100]Si2ON2 is parallel to one of the three [1120BAR]SiC directions, while the (0001) surface of SiC can be parallel to either (001) or one of the two {021} planes of Si2ON2, giving a total of nine orientational variants. Possible atomic models of the interface have been constructed and analyzed. It is found that the observed orientation relationships are such as to optimize the matching of the [SiC4] and [SiON3] tetrahedra across the interface. In fact, the (001) and {021} planes have the highest planar densities of such tetrahedra in the Si2ON2 structure, as does the (0001) plane in SiC. C1 RUTGERS STATE UNIV, DEPT CERAM ENGN, PISCATAWAY, NJ 08855 USA. LOS ALAMOS NATL LAB, INST MAT SCI & TECHNOL, LOS ALAMOS, NM 87545 USA. LOS ALAMOS NATL LAB, CTR MAT SCI, LOS ALAMOS, NM 87545 USA. RP CHADWICK, MM (reprint author), MCMASTER UNIV, DEPT MAT SCI & ENGN, HAMILTON L8S 4L8, ONTARIO, CANADA. NR 15 TC 1 Z9 1 U1 1 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 FEB PY 1993 VL 41 IS 2 BP 375 EP 386 DI 10.1016/0956-7151(93)90068-4 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KK907 UT WOS:A1993KK90700006 ER PT J AU KAMEDA, J AF KAMEDA, J TI HIGH-TEMPERATURE BRITTLE INTERGRANULAR CRACKING IN HIGH-STRENGTH NICKEL-ALLOYS UNDOPED AND DOPED WITH S, ZR AND OR B .1. CRACK-GROWTH CHARACTERISTICS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID STRESS-RELIEF CRACKING; SEGREGATION; FRACTURE; STEEL; SULFUR; CREEP; EMBRITTLEMENT; DIFFUSION; NI AB High temperature (823 923 K) brittle intergranular cracking behavior has been studied in gamma' strengthening nickel alloys doped with and without S, B and/or Zr. The growth rate of brittle intergranular cracks was found to be described by da/dt = a0(K/K0)n where K0 and a0 represent a transition from the crack nucleation to growth controlling process. The alloy composition and temperature produced quite different effects on K0 and n. In undoped and S-doped alloys, high temperature cracking occurred at the lowest K0 which strongly depends on the temperature. However, the undoped and S-doped alloys exhibited the lowest and highest values of n, respectively, almost independent of the temperature. The addition of B increased K0 and decreased n more greatly than that of Zr in alloys with high S. The alloy with high S and Zr showed the strongest temperature dependence of n in all the alloys. It has been shown by estimating the activation energy from the Arrhenius plot of a0 that the brittle intergranular cracking behavior is controlled by S diffusion at grain boundaries and on crack surfaces. RP KAMEDA, J (reprint author), IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 30 TC 5 Z9 5 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 FEB PY 1993 VL 41 IS 2 BP 517 EP 525 DI 10.1016/0956-7151(93)90081-3 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KK907 UT WOS:A1993KK90700019 ER PT J AU KAMEDA, J BEVOLO, AJ AF KAMEDA, J BEVOLO, AJ TI HIGH-TEMPERATURE BRITTLE INTERGRANULAR CRACKING IN HIGH-STRENGTH NICKEL-ALLOYS UNDOPED AND DOPED WITH S, ZR, AND OR B .2. SOLUTE SEGREGATION ANALYSIS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID FRACTURE; STEEL; STRESS; EQUILIBRIUM; DUCTILE; GROWTH; MODEL AB In order to clarify the mechanism of high temperature brittle intergranular cracking in high strength nickel alloys, solute segregation at grain boundaries and on high temperature fracture surfaces has been examined by scanning Auger microscopy. Intergranular S segregation producing global embrittling effects was found to increase in the following order: alloys with low S or high S and Zr, high S and B, and high S. The grain boundaries extensively contained Ti or Zr rich sulfides in the S-doped alloys and B segregation inducing intergranular toughening in the alloy with high S and B. The alloys with low S, and high S and B showed more strongly S segregation on high temperature fracture surfaces, which was much greater compared with at grain boundaries, than with high S, and high S and Zr. The local stress intensification did not produce a remarkable S enrichment at grain boundaries except near sulfides. It is proposed that S fluxes from crack surfaces and stressed sulfides to the crack tip induce local embrittlement. The composition and temperature effects on the brittle cracking behavior are discussed in terms of the global and local embrittling effects. RP KAMEDA, J (reprint author), IOWA STATE UNIV SCI & TECHNOL, AMES LAB, AMES, IA 50011 USA. NR 22 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD FEB PY 1993 VL 41 IS 2 BP 527 EP 537 DI 10.1016/0956-7151(93)90082-4 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KK907 UT WOS:A1993KK90700020 ER PT J AU REHM, KE AF REHM, KE TI FROM SIMPLE TO COMPLEX-REACTIONS - NUCLEAR COLLISIONS NEAR THE COULOMB BARRIER SO ACTA PHYSICA POLONICA B LA English DT Article; Proceedings Paper CT 27TH ZAKOPANE SCHOOL OF PHYSICS CY AUG 31-SEP 09, 1992 CL ZAKOPANE, POLAND ID QUASI-ELASTIC PROCESSES; SUBBARRIER FUSION; SCATTERING; SEPARATOR; O-16 RP REHM, KE (reprint author), ARGONNE NATL LAB,DIV PHYS,ARGONNE,IL 60439, USA. NR 30 TC 0 Z9 0 U1 0 U2 0 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4254 J9 ACTA PHYS POL B JI Acta Phys. Pol. B PD FEB PY 1993 VL 24 IS 2 BP 241 EP 255 PG 15 WC Physics, Multidisciplinary SC Physics GA KR361 UT WOS:A1993KR36100001 ER PT J AU JARZYNSKI, C AF JARZYNSKI, C TI SOME RECENT RESULTS IN CLASSICAL AND QUANTAL CHAOS SO ACTA PHYSICA POLONICA B LA English DT Article; Proceedings Paper CT 27TH ZAKOPANE SCHOOL OF PHYSICS CY AUG 31-SEP 09, 1992 CL ZAKOPANE, POLAND C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP JARZYNSKI, C (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. RI Jarzynski, Christopher/B-4490-2009 OI Jarzynski, Christopher/0000-0002-3464-2920 NR 4 TC 2 Z9 2 U1 0 U2 1 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4254 J9 ACTA PHYS POL B JI Acta Phys. Pol. B PD FEB PY 1993 VL 24 IS 2 BP 463 EP 474 PG 12 WC Physics, Multidisciplinary SC Physics GA KR361 UT WOS:A1993KR36100026 ER PT J AU VLACHY, V BLANCH, HW PRAUSNITZ, JM AF VLACHY, V BLANCH, HW PRAUSNITZ, JM TI LIQUID LIQUID-PHASE SEPARATIONS IN AQUEOUS-SOLUTIONS OF GLOBULAR-PROTEINS SO AICHE JOURNAL LA English DT Article ID SMALL-ANGLE SCATTERING; COLLOIDAL DISPERSIONS; POLYMER; PRECIPITATION; SUSPENSIONS; MECHANISM; PARTICLES; MOLECULES; STABILITY; SYSTEM AB A simple statistical-mechanical theory, known as the random-phase approximation, is applied to study liquid-liquid phase separations in solutions of globular proteins. Phase separation may be induced by addition of nonionic polymer or/and ordinary electrolytes. In this analysis, the osmotic-attraction mechanism, whereby the depletion of ''solvent'' particles between two proteins causes an attractive force, is primarily responsible for phase separation. For one-component models of protein solutions, the theory yields simple algebraic expressions for the equation of state and for the chemical potential of the protein. This analytical theory describes the observed solubility behavior of proteins, including the effect of protein and polymer size, protein charge and concentration, and concentration of simple electrolytes. C1 LAWRENCE BERKELEY LAB,DEPT CHEM ENGN,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. NR 37 TC 45 Z9 46 U1 0 U2 4 PU AMER INST CHEMICAL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0001-1541 J9 AICHE J JI AICHE J. PD FEB PY 1993 VL 39 IS 2 BP 215 EP 223 DI 10.1002/aic.690390204 PG 9 WC Engineering, Chemical SC Engineering GA KK888 UT WOS:A1993KK88800003 ER PT J AU BREUNING, MH DAUWERSE, HG FUGAZZA, G SARIS, JJ SPRUIT, L WIJNEN, H TOMMERUP, N VANDERHAGEN, CB IMAIZUMI, K KUROKI, Y VANDENBOOGAARD, MJ DEPATER, JM MARIMAN, ECM HAMEL, BCJ HIMMELBAUER, H FRISCHAUF, AM STALLINGS, RL BEVERSTOCK, GC VANOMMEN, GJB HENNEKAM, RCM AF BREUNING, MH DAUWERSE, HG FUGAZZA, G SARIS, JJ SPRUIT, L WIJNEN, H TOMMERUP, N VANDERHAGEN, CB IMAIZUMI, K KUROKI, Y VANDENBOOGAARD, MJ DEPATER, JM MARIMAN, ECM HAMEL, BCJ HIMMELBAUER, H FRISCHAUF, AM STALLINGS, RL BEVERSTOCK, GC VANOMMEN, GJB HENNEKAM, RCM TI RUBINSTEIN-TAYBI SYNDROME CAUSED BY SUBMICROSCOPIC DELETIONS WITHIN 16P13.3 SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID POLYCYSTIC KIDNEY-DISEASE; SHORT ARM; INSITU HYBRIDIZATION; CHROMOSOME-16; DNA; LOCALIZATION; LEUKEMIA; MARKERS; LOCI; GENE AB The Rubinstein-Taybi syndrome (RTS) is a well-defined complex of congenital malformations characterized by facial abnormalities, broad thumbs and big toes, and mental retardation. The breakpoint of two distinct reciprocal translocations occurring in patients with a clinical diagnosis of RTS was located to the same interval on chromosome 16, between the cosmids N2 and RT1, in band 16p13.3. By using two-color fluorescence in situ hybridization, the signal from RT1 was found to be missing from one chromosome 16 in 6 of 24 patients with RTS. The parents of five of these patients did not show a deletion of RT1, indicating a de novo rearrangement. RTS is caused by submicroscopic interstitial deletions within 16p13.3 in approximately 25% of the patients. The detection of microdeletions will allow the objective confirmation of the clinical diagnosis in new patients and provides an excellent tool for the isolation of the gene causally related to the syndrome. C1 JOHN F KENNEDY INST,DANISH CTR HUMAN GENOME RES,GLOSTRUP,DENMARK. UNIV HOSP NIJMEGEN,DEPT HUMAN GENET,NIJMEGEN,NETHERLANDS. IMPERIAL CANC RES FUND,LONDON WC2A 3PX,ENGLAND. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. AVD MED GENET,OSLO,NORWAY. KANAGAWA CHILDRENS MED CTR,DIV MED GENET,YOKOHAMA,KANAGAWA,JAPAN. CLIN GENET CTR,UTRECHT,NETHERLANDS. RP BREUNING, MH (reprint author), LEIDEN UNIV,SYLVIUS LABS,DEPT HUMAN GENET,WASSENAARSEWEG 72,2333 AL LEIDEN,NETHERLANDS. RI Breuning, Martijn/E-3429-2010; Stallings, Raymond/A-7213-2008; Wijnen, Herman/B-8860-2013 NR 32 TC 74 Z9 76 U1 0 U2 3 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0002-9297 J9 AM J HUM GENET JI Am. J. Hum. Genet. PD FEB PY 1993 VL 52 IS 2 BP 249 EP 254 PG 6 WC Genetics & Heredity SC Genetics & Heredity GA KN275 UT WOS:A1993KN27500001 PM 8430691 ER PT J AU BACHINSKI, LL KRAHE, R WHITE, BF WIERINGA, B SHAW, D KORNELUK, R THOMPSON, LH JOHNSON, K SICILIANO, MJ AF BACHINSKI, LL KRAHE, R WHITE, BF WIERINGA, B SHAW, D KORNELUK, R THOMPSON, LH JOHNSON, K SICILIANO, MJ TI AN INFORMATIVE PANEL OF SOMATIC-CELL HYBRIDS FOR PHYSICAL MAPPING ON HUMAN CHROMOSOME-19Q SO AMERICAN JOURNAL OF HUMAN GENETICS LA English DT Article ID MYOTONIC-DYSTROPHY LOCUS; DNA-REPAIR GENE; SISTER-CHROMATID EXCHANGE; EXCISION-REPAIR; MOLECULAR-CLONING; LINKAGE RELATIONSHIPS; MUSCULAR-DYSTROPHY; GLYCOPROTEIN GENES; PROTEIN-KINASE; X-CHROMOSOME AB A panel of 22 somatic cell hybrids divides the q arm of human chromosome 19 into 22 ordered subregions. The panel was characterized with respect to 41 genetic markers. In most cases, a single fragment of chromosome 19 was present in each hybrid. In two cell lines the presence of multiple fragments of the chromosome was demonstrated by segregation of these fragments in subclones. On the basis of the results of marker analysis in this panel, the most likely order of the markers tested is MANB-D19S7-PEPD-D19S9-GPI-C/EBP-TGFB1-(CYP2A,BCKDHA,CGM2,NCA)-PSG1-(D19S8,XRCC1)-(ATP1A3,D19S19)-(D19S37,APOC2)-CKM-ERCC2-ERCC1-(D19S116,D19S117)-(D19S118,D19S119, D19S63,p36.1,D19S112,D19S62,D19S51,D19S54, D19S55)-pW39-D19S6-(D19S50,TNNT1)-D19S22-(HRC,CGB,FTL,PRKCG)-qter. This gene order is generally consistent with published physical and genetic mapping orders, although some discrepancies exist. By means of a mapping function that relates the frequency of cosegregation of markers to the distance between them, estimates were made of the sizes, in megabases, of the 19q subregions. The relative physical distances between reference markers were compared with published genetic distances for 19q. Excellent correlation was observed, suggesting that the physical distances calculated by this method are predictive of genetic distances in this region of the genome and, therefore, are just as useful in estimating relative positions of markers. C1 UNIV TEXAS,MD ANDERSON CANC CTR,DEPT MOLEC GENET,HOUSTON,TX 77025. CATHOLIC UNIV NIJMEGEN,DEPT CELL BIOL & HISTOL,NIJMEGEN,NETHERLANDS. UNIV WALES COLL MED,DEPT MED GENET,CARDIFF CF4 4XN,S GLAM,WALES. CHILDRENS HOSP EASTERN ONTARIO,MOLEC GENET LAB,OTTAWA K1H 8L1,ONTARIO,CANADA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. CHARING CROSS & WESTMINISTER HOSP,DEPT ANAT,LONDON,ENGLAND. RP BACHINSKI, LL (reprint author), BAYLOR COLL MED,DEPT MED & CARDIOL,1 BAYLOR PLAZA,ROOM 543E,HOUSTON,TX 77030, USA. RI Wieringa, Berend/A-5346-2011 OI Wieringa, Berend/0000-0001-9192-8020 FU NCI NIH HHS [CA09929, CA34936] NR 73 TC 19 Z9 19 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0002-9297 J9 AM J HUM GENET JI Am. J. Hum. Genet. PD FEB PY 1993 VL 52 IS 2 BP 375 EP 387 PG 13 WC Genetics & Heredity SC Genetics & Heredity GA KN275 UT WOS:A1993KN27500016 PM 8430698 ER PT J AU WING, S SHY, CM WOOD, JL WOLF, S CRAGLE, DL TANKERSLEY, W FROME, EL AF WING, S SHY, CM WOOD, JL WOLF, S CRAGLE, DL TANKERSLEY, W FROME, EL TI JOB FACTORS, RADIATION AND CANCER MORTALITY AT OAK-RIDGE-NATIONAL-LABORATORY - FOLLOW-UP THROUGH 1984 SO AMERICAN JOURNAL OF INDUSTRIAL MEDICINE LA English DT Article DE CANCER; OCCUPATIONAL EXPOSURE; HEALTH EFFECTS; NUCLEAR WORKERS; RISK ESTIMATES; IONIZING RADIATION ID TIME-RELATED FACTORS; WORKERS; COHORT; INDUSTRY; EXPOSURE; RATES AB A previous study of mortality among white men hired at Oak Ridge National Laboratory between 1943 and 1972 (n = 8,318) revealed an association between low-dose external penetrating ionizing radiation and cancer mortality in follow-up through 1984. The association was not observed in follow-up through 1977. This report considers the role of possible selection and confounding factors not previously studied. Control for hire during the World War II era and employment duration of less than 1 year had little effect on the radiation risk estimates. Risks associated with length of time spent in 15 job categories were considered as proxies for the effects of other occupational carcinogens. Ajustment for employment duration in each job category one at a time produced only small changes in the radiation risk estimate. Adjustment for potential exposures to beryllium, lead, and mercury also had little effect on the radiation risk estimates. These analyses suggest that selection factors and potential for chemical exposure do not account for the previously noted association of external radiation dose with cancer mortality. However, power to detect effects of chemical exposures is limited by a lack of individual exposure measures. C1 OAK RIDGE NATL LAB,OAK RIDGE INST SCI & EDUC,CTR EPIDEMIOL RES,OAK RIDGE,TN. OAK RIDGE NATL LAB,DIV MATH SCI,OAK RIDGE,TN. RP WING, S (reprint author), UNIV N CAROLINA,SCH PUBL HLTH,DEPT EPIDEMIOL CB7400,CHAPEL HILL,NC 27599, USA. NR 32 TC 18 Z9 18 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0271-3586 J9 AM J IND MED JI Am. J. Ind. Med. PD FEB PY 1993 VL 23 IS 2 BP 265 EP 279 DI 10.1002/ajim.4700230204 PG 15 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA KJ713 UT WOS:A1993KJ71300003 PM 8427255 ER PT J AU VITT, JE JOHNSON, DC AF VITT, JE JOHNSON, DC TI EFFECT OF ROTATION RATE ON THE RESPONSE AT POLY(CHLOROTRIFLUOROETHYLENE) COMPOSITE DISK ELECTRODES SO ANALYTICAL CHEMISTRY LA English DT Article ID PARTIALLY COVERED ELECTRODES; RECTANGULAR FLOW CHANNEL; ELECTROCHEMICAL DETECTION; LIQUID-CHROMATOGRAPHY; DIFFUSION CURRENT; CARBAMATE PESTICIDES; CONVECTIVE-DIFFUSION; GOLD ELECTRODES; VOLTAMMETRY; STATIONARY AB Microelectrode arrays were operated as rotated disk electrodes (RDEs) to examine the effects of convection on their voltammetric response. The microelectrode array RDEs were Kelgraf (graphite and Kel-F) and Au/Kelgraf (Au, graphite, and Kel-F) composite electrodes. As expected for microelectrode arrays, a significant enhancement in current density was observed in comparison to solid RDEs. For example, the current density for the oxidation of hydrazine at a rotation rate of 10.5 rad s-1 was 13 times larger at a 2% Au/10% Kelgraf RDE than at a solid Au RDE. The relative current density (J) was defined as the ratio of the current density at a microelectrode array RDE in comparison to that at a solid RDE. The largest values of J were obtained for the lowest values of rotation rate and for ca. 2-3% active area; however, the values of J were dependent on the choice of the test reaction. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. N DAKOTA STATE UNIV,DEPT CHEM,FARGO,ND 58105. NR 50 TC 12 Z9 12 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD FEB 1 PY 1993 VL 65 IS 3 BP 231 EP 237 DI 10.1021/ac00051a007 PG 7 WC Chemistry, Analytical SC Chemistry GA KK450 UT WOS:A1993KK45000007 ER PT J AU MANECKE, GR LASTER, B KAHL, S GORDON, C BRUGGER, R POPPERS, PJ AF MANECKE, GR LASTER, B KAHL, S GORDON, C BRUGGER, R POPPERS, PJ TI BENZODIAZEPINES AFFECT THE CELLULAR UPTAKE OF PORPHYRINS SO ANESTHESIA AND ANALGESIA LA English DT Meeting Abstract C1 UCSF,SAN FRANCISCO,CA. SUNY STONY BROOK,DEPT ANESTHESIOL,STONY BROOK,NY 11794. BROOKHAVEN NATL LAB,MED RES DEPT,UPTON,NY 11973. NR 4 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD FEB PY 1993 VL 76 IS 2 SU S BP S237 EP S237 PG 1 WC Anesthesiology SC Anesthesiology GA KY039 UT WOS:A1993KY03900235 ER PT J AU FRISK, H GUHR, T AF FRISK, H GUHR, T TI SPIN-ORBIT-COUPLING IN SEMICLASSICAL APPROXIMATION SO ANNALS OF PHYSICS LA English DT Article ID PERIODIC-ORBITS; SHELL STRUCTURE; WAVE-EQUATIONS; HYDROGEN-ATOM; PHASE; CHAOS; NUCLEI; SPECTRUM; DENSITY; BERRY C1 NORDITA,DK-2100 COPENHAGEN,DENMARK. RP FRISK, H (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 45 TC 33 Z9 33 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD FEB 1 PY 1993 VL 221 IS 2 BP 229 EP 257 DI 10.1006/aphy.1993.1011 PG 29 WC Physics, Multidisciplinary SC Physics GA KK438 UT WOS:A1993KK43800003 ER PT J AU LEFF, LG DANA, JR MCARTHUR, JV SHIMKETS, LJ AF LEFF, LG DANA, JR MCARTHUR, JV SHIMKETS, LJ TI DETECTION OF TN5-LIKE SEQUENCES IN KANAMYCIN-RESISTANT STREAM BACTERIA AND ENVIRONMENTAL DNA SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID GRAM-NEGATIVE BACTERIA; MYXOCOCCUS-XANTHUS; MICROBIAL-POPULATIONS; SOIL; HYBRIDIZATION; SEDIMENTS; PROBES; GENES; MICROORGANISMS; EXTRACTION AB Resistance to kanamycin and neomycin in the bacterial assemblage of a coastal plain stream was detected by growth of colonies on media containing antibiotics. Three of 184 kanamycin-resistant colonies hybridized with a probe containing the nptII gene from transposon Tn5; the nptII gene encodes the enzyme neomycin phosphotransferase and conveys resistance to kanamycin and neomycin. In one of these isolates, the homologous gene was cloned and shown to confer resistance to a kanamycin-sensitive Escherichia coli strain. Since enumeration of bacteria by acridine orange direct counts revealed that less than 0.2% of the bacteria present were cultivated, direct examination of environmental DNA was used to assess abundance of sequences that hybridize to the nptII gene. To examine the resistance potential of bacteria that were not cultured, total DNA was extracted from environmental samples and hybridized with specific probes. The relative amount of eubacterial DNA in each sample was determined by using a eubacterial specific rDNA probe. Then, the abundance of sequences that hybridize to the eubacterial neomycin phosphotransferase gene was determined by hybridization and expressed relative to the total eubacterial DNA in the assemblage. Relative gene abundance was significantly different among assemblages from different habitats (leaves, midchannel sediments, and bank sediments) but did not differ among stream sites. C1 SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RP LEFF, LG (reprint author), UNIV GEORGIA,DEPT MICROBIOL,ATHENS,GA 30602, USA. NR 33 TC 27 Z9 27 U1 1 U2 4 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD FEB PY 1993 VL 59 IS 2 BP 417 EP 421 PG 5 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA KK916 UT WOS:A1993KK91600010 PM 8382021 ER PT J AU CRAWFORD, DL DOYLE, JD WANG, ZM HENDRICKS, CW BENTJEN, SA BOLTON, H FREDRICKSON, JK BLEAKLEY, BH AF CRAWFORD, DL DOYLE, JD WANG, ZM HENDRICKS, CW BENTJEN, SA BOLTON, H FREDRICKSON, JK BLEAKLEY, BH TI EFFECTS OF A LIGNIN PEROXIDASE-EXPRESSING RECOMBINANT, STREPTOMYCES-LIVIDANS TK23.1, ON BIOGEOCHEMICAL CYCLING AND THE NUMBERS AND ACTIVITIES OF MICROORGANISMS IN SOIL SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID GENETICALLY ENGINEERED MICROORGANISMS; CORE MICROCOSMS; ERWINIA-CAROTOVORA; WILD-TYPE; SURVIVAL; 2,4-DICHLOROPHENOXYACETATE; MINERALIZATION; DEGRADATION; ECOSYSTEM; BACTERIA AB A recombinant actinomycete, Streptomyces lividans TK23.1, expressing a pIJ702-encoded extracellular lignin peroxidase gene cloned from the chromosome of Streptomyces viridosporus T7A, was released into soil in flask- and microcosm-scale studies to determine its effects on humification and elemental cycling and on the numbers, types, and activities of microorganisms native to the soil. Strain TK23.1 had been shown previously to transiently increase the rate of organic carbon mineralization in soil via an effect that was recombinant specific and particularly significant in nonsterile soils already possessing an active microflora. The results of this study confirmed the previous findings and showed that additional effects were measurable upon release of the recombinant strain TK23.1 into unamended soil and into soil amended with lignocellulose. In addition to a transient enhancement of carbon mineralization, the recombinant affected soil pH, the rate of incorporation of carbon into soil humus fractions, nitrogen cycling, the relative populations of some microbial groups, and also certain soil enzyme activities. Whereas the survival or persistence in soil of the recombinant TK23.1 strain and that of its parent, TK23, were similar, the observed effects on microbial numbers, types, and activities were recombinant specific and did not occur when the parental strain was released into soil. All of the measured effects were transient, generally lasting for only a few days. While the effects were statistically significant, their ecological significance appears to be minimal. This is the first report showing that a recombinant actinomycete can affect the microbial ecology of soil in ways that can be readily monitored by using a battery of microbiological, enzymological, and chemical assays. C1 US EPA, ENVIRONM RES LAB, CORVALLIS, OR 97333 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. MANTECH ENVIRONM TECHNOL INC, CORVALLIS, OR 97333 USA. RP UNIV IDAHO, DEPT BACTERIOL & BIOCHEM, MOSCOW, ID 83844 USA. RI Bolton, Harvey/E-5583-2011 NR 43 TC 20 Z9 20 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1752 N ST NW, WASHINGTON, DC 20036-2904 USA SN 0099-2240 EI 1098-5336 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD FEB PY 1993 VL 59 IS 2 BP 508 EP 518 PG 11 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA KK916 UT WOS:A1993KK91600024 PM 8434915 ER PT J AU KWONG, MK AF KWONG, MK TI SWEEPING ALGORITHMS FOR INVERTING THE DISCRETE GINZBURG-LANDAU OPERATOR SO APPLIED MATHEMATICS AND COMPUTATION LA English DT Article ID EQUATIONS AB The Ginzburg Landau equations we study arise in the modeling of superconductivity. One widely used method of discretizing the equations together with the associated periodic boundary conditions, in the case of a rectangle of dimension 2, leads to a five-point, stencil. Solving the system means inverting a sparse matrix of dimension N2, where N is the number of grid points on each side of the rectangle. We propose a method that is similar to the shooting technique in the numerical solution of ordinary differential equations. For small N, the method requires inverting a full matrix of dimension 2N. When N is large, an iterative procedure combining partial sweeping and the technique of divide and conquer (domain decomposition) is appropriate. RP KWONG, MK (reprint author), ARGONNE NATL LAB, DIV MATH & COMP SCI, ARGONNE, IL 60439 USA. NR 19 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0096-3003 EI 1873-5649 J9 APPL MATH COMPUT JI Appl. Math. Comput. PD FEB PY 1993 VL 53 IS 2-3 BP 129 EP 150 DI 10.1016/0096-3003(93)90098-Y PG 22 WC Mathematics, Applied SC Mathematics GA KK930 UT WOS:A1993KK93000004 ER PT J AU WARREN, WL TUTTLE, BA MCWHORTER, PJ RONG, FC POINDEXTER, EH AF WARREN, WL TUTTLE, BA MCWHORTER, PJ RONG, FC POINDEXTER, EH TI IDENTIFICATION OF PARAMAGNETIC PB-(+3) DEFECTS IN LEAD ZIRCONATE TITANATE CERAMICS SO APPLIED PHYSICS LETTERS LA English DT Article ID MEMORIES AB We report the first observation of positively charged Pb+3 defect centers in lead zirconate titanate (PZT) ceramics using electron paramagnetic resonance. The charged traps were optically generated using ultraviolet light energies roughly corresponding to the band gap of PZT (3.4 eV). The interpretation of the Pb-207(+3) hyperfine parameters indicates that the defect's unpaired electron is approximately 48% localized on the Pb nucleus. These observations may be of considerable importance since they prove that charged carriers created by optical excitation become trapped and form charged paramagnetic defects. C1 USA,RES LAB,FT MONMOUTH,NJ 07703. RP WARREN, WL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 16 TC 16 Z9 16 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 FEB 1 PY 1993 VL 62 IS 5 BP 482 EP 484 DI 10.1063/1.108940 PG 3 WC Physics, Applied SC Physics GA KJ726 UT WOS:A1993KJ72600017 ER PT J AU LUO, L HAWLEY, ME MAGGIORE, CJ DYE, RC MUENCHAUSEN, RE CHEN, L SCHMIDT, B KALOYEROS, AE AF LUO, L HAWLEY, ME MAGGIORE, CJ DYE, RC MUENCHAUSEN, RE CHEN, L SCHMIDT, B KALOYEROS, AE TI SPIRAL GROWTH IN EPITAXIAL YBA2CU3O7-X THIN-FILMS PRODUCED BY HIGH DEPOSITION RATE CHEMICAL VAPOR-DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID SCANNING TUNNELING MICROSCOPY AB A technologically useful chemical vapor deposition process with high growth rate ( > 4 mum/h) was developed for the epitaxial growth of YBa2Cu3O7-x (YBCO) thin films. Even at the high growth rate used in this process, a spiral growth mechanism was observed and the films grown had electrical (T(c) = 92 K, J(c) of 2 X 10(6) A/cm2 at 77 K) and structural properties equal to films produced by physical vapor deposition. C1 SUNY ALBANY,DEPT PHYS,ALBANY,NY 12222. RP LUO, L (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 11 TC 24 Z9 25 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 1 PY 1993 VL 62 IS 5 BP 485 EP 486 DI 10.1063/1.108914 PG 2 WC Physics, Applied SC Physics GA KJ726 UT WOS:A1993KJ72600018 ER PT J AU LEE, C HAYNES, TE JONES, KS AF LEE, C HAYNES, TE JONES, KS TI KINETICS OF SOLID-PHASE EPITAXIAL REGROWTH IN AMORPHIZED SI0.88GE0.12 MEASURED BY TIME-RESOLVED REFLECTIVITY SO APPLIED PHYSICS LETTERS LA English DT Article ID SI1-XGEX; GROWTH; STRAIN; SI AB Time-resolved reflectivity has been used to measure the rate of solid phase epitaxial regrowth (SPER) in situ during annealing of strained Si0.88Ge0.12 epilayers on Si preamorphized by the implantation of Si. The SPER velocities were measured over more than two orders of magnitude at temperatures from 503 to 603-degrees-C. The results confirm that the average SPER velocity in thin, strained Si0.88Ge0.12 layers is less than that in pure Si. Furthermore, these real-time measurements demonstrate that the SPER rate for strained Si0.88Ge0.12 alloys is not a constant during regrowth at a fixed temperature but varies systematically as a function of the position of the amorphous-crystalline interface. The activation energy barrier of SPER in strained Si0.88Ge0.12 is higher than that in pure Si and is also a function of interface position, ranging from 2.94 to 3.11 eV. Cross-section transmission electron microscopy shows that strain-relieving defects are introduced coincidentally with the minimum regrowth rate. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611. RI Haynes, Tony/P-8932-2015 OI Haynes, Tony/0000-0003-2871-4745 NR 10 TC 34 Z9 34 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 FEB 1 PY 1993 VL 62 IS 5 BP 501 EP 503 DI 10.1063/1.108892 PG 3 WC Physics, Applied SC Physics GA KJ726 UT WOS:A1993KJ72600024 ER PT J AU DUCKWORTH, DC BARSHICK, CM BOSTICK, DA SMITH, DH AF DUCKWORTH, DC BARSHICK, CM BOSTICK, DA SMITH, DH TI DIRECT MEASUREMENT OF URANIUM ISOTOPIC-RATIOS IN SOILS BY GLOW-DISCHARGE MASS-SPECTROMETRY SO APPLIED SPECTROSCOPY LA English DT Note DE GLOW DISCHARGE MASS SPECTROMETRY; ISOTOPE RATIOS; URANIUM SOIL C1 OAK RIDGE NATL LAB,DIV ANALYT CHEM,OAK RIDGE,TN 37831. RI Duckworth, Douglas/B-7171-2015 OI Duckworth, Douglas/0000-0002-8161-5685 NR 7 TC 22 Z9 22 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 FEB PY 1993 VL 47 IS 2 BP 243 EP 245 DI 10.1366/0003702934048352 PG 3 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA KM239 UT WOS:A1993KM23900020 ER PT J AU KIRKMAN, LK SHARITZ, RR AF KIRKMAN, LK SHARITZ, RR TI GROWTH IN CONTROLLED WATER REGIMES OF 3 GRASSES COMMON IN FRESH-WATER WETLANDS OF THE SOUTHEASTERN USA SO AQUATIC BOTANY LA English DT Article ID PLANTS; ETHYLENE; ECOPHYSIOLOGY; ENVIRONMENTS; SUBMERGENCE; MARSH AB Growth and drought tolerances of three common freshwater wetland grasses, Panicum hemitomon Schult., Manisuris rugosa (Nutt.) Kuntze, and Leersia hexandra Sw., were compared in experimental manipulations. Additionally, the effect of fire on the growth of P. hemitomon was examined. Rhizomes of these three perennial species were grown in small plastic pools under the following water treatments: (1) moist soil; (2) saturated soil (0 cm water depth); (3) inundated (13 cm water depth all year); (4) inundated-moist (13 cm water depth part of the year, followed by moist soil). Inundated plants of all species grew twice as tall as those in the moist soil treatment. This difference was interpreted as an elongation response to partial submergence. Under inundated conditions, stem elongation in M. rugosa was the same regardless of the water duration or depth. In P. hemitomon, stem heights varied with duration and depth of flooding: inundated>inundated-moist>saturated. For L. hexandra, mean stem height did not differ between inundated-moist and saturated water regimes. Mean above-ground to below-ground biomass ratio for L. hexandra was greater than that of either P. hemitomon or M. rugosa regardless of treatment. Panicum hemitomon produced no flowering stems under any of the treatments. For M. rugosa and L. hexandra, most flowering stems were produced under the inundated or saturated treatments. Winter fire, followed by the inundated or inundated-moist treatments, had a negative effect on emergence and overall growth of P. hemitomon, suggesting that winter stems are important for survival of this species. Relative drought tolerances, as measured by stomatal conductance and predawn xylem pressure potential, indicated least stomatal control by L. hexandra, followed by P. hemitomon and M. rugosa. Results suggest greater drought tolerance by M. rugosa and greater flood tolerance by P. hemitomon and L. hexandra. C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,DRAWER E,AIKEN,SC 29802. UNIV GEORGIA,DEPT BOT,ATHENS,GA 30602. NR 35 TC 34 Z9 38 U1 1 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3770 J9 AQUAT BOT JI Aquat. Bot. PD FEB PY 1993 VL 44 IS 4 BP 345 EP 359 DI 10.1016/0304-3770(93)90076-9 PG 15 WC Plant Sciences; Marine & Freshwater Biology SC Plant Sciences; Marine & Freshwater Biology GA KM910 UT WOS:A1993KM91000001 ER PT J AU JAGOE, CH MATEY, VE HAINES, TA KOMOV, VT AF JAGOE, CH MATEY, VE HAINES, TA KOMOV, VT TI EFFECT OF BERYLLIUM ON FISH IN ACID WATER IS ANALOGOUS TO ALUMINUM TOXICITY SO AQUATIC TOXICOLOGY LA English DT Article DE ACIDIFICATION; BERYLLIUM; TOXICITY; GILLS; ULTRASTRUCTURE ID TROUT SALVELINUS-FONTINALIS; SALMO-GAIRDNERI; RAINBOW-TROUT; LOW PH; GILL MORPHOLOGY; BROWN TROUT; ION BALANCE; EXPOSURE; CALCIUM; HEMATOLOGY AB Trace metals such as aluminum, when mobilized by acid deposition, may be important toxic agents in acidified waters. Beryllium is chemically similar to aluminum, and its solubility and aqueous speciation properties suggest that it may also be a problem in some acidic waters. Elevated beryllium levels have been found in some waters, but little is known of the potential toxic effects of beryllium in soft water at low pH. We exposed juvenile perch Perca fluviatilis and roach Rutilus rutilus to beryllium at two levels of pH. Beryllium concentrations of 10 mug/l or more caused increased mortality at pH 4.5 in perch, but only higher concentrations (>50 mug/l) were lethal at pH 5.5. In roach, beryllium concentrations greater-than-or-equal-to 100 mug/l killed most fish within 96 h, regardless of pH. Beryllium also produced gill abnormalities similar to those caused by aluminum at concentrations as low as 10 mu/l. The abnormalities became more severe at higher beryllium levels, and included development of chloride cell apical crypts, increased mucus production, microridge loss, epithelial hyperplasia, and fusions of primary lamellae. The effects of beryllium and aluminum are similar, but beryllium causes gill damage at lower concentrations, suggesting that it may be an important, unrecognized contaminant in some acidic waters. C1 INST BIOL INLAND WATERS,YAROSLAVL OBLAST,RUSSIA. UNIV MAINE,DEPT ZOOL,US FISH & WILDLIFE SERV,NATL FISHERIES CONTAMINANT RES CTR,ORONO,ME 04473. RP JAGOE, CH (reprint author), UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,PO DRAWER E,AIKEN,SC 29802, USA. RI Komov, Viktor/O-8916-2015 OI Komov, Viktor/0000-0001-9124-7428 NR 37 TC 17 Z9 19 U1 3 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-445X J9 AQUAT TOXICOL JI Aquat. Toxicol. PD FEB PY 1993 VL 24 IS 3-4 BP 241 EP 256 DI 10.1016/0166-445X(93)90074-B PG 16 WC Marine & Freshwater Biology; Toxicology SC Marine & Freshwater Biology; Toxicology GA KP917 UT WOS:A1993KP91700006 ER PT J AU LEFF, LG MCARTHUR, JV SHIMKETS, LJ AF LEFF, LG MCARTHUR, JV SHIMKETS, LJ TI EVALUATION OF SOURCES OF BACTERIA IN COASTAL-PLAIN STREAMS USING GRAM STAINING SO ARCHIV FUR HYDROBIOLOGIE LA English DT Article ID SOUTHEASTERN BLACKWATER RIVERS; SUSPENDED BACTERIA; HETEROTROPHIC ACTIVITY; PLANKTONIC BACTERIA; POPULATIONS; BIOMASS AB Planktonic bacteria in rivers and streams may be primarily produced in sediments, biofilms, and floodplains rather than the water column. The purpose of this study was to evaluate the utility of comparison of bacterial assemblage features (i.e., gram staining response, cell morphology, colony morphology) in determining sources of stream bacteria. Floodplain soils, stream sediments and water were sampled in two coastal plain streams. Gram staining and cell morphology were both useful in distinguishing among potential sources. An influx of bacteria from floodplain soils into a stream during a storm was demonstrated using this approach but these comparisons were not useful at all sites. C1 UNIV GEORGIA,INST ECOL,ATHENS,GA 30602. UNIV GEORGIA,DEPT MICROBIOL,ATHENS,GA 30602. RP LEFF, LG (reprint author), SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802, USA. NR 22 TC 10 Z9 10 U1 0 U2 1 PU E SCHWEIZERBART'SCHE VERLAGS PI STUTTGART PA NAEGELE U OBERMILLER JOHANNESSTRASSE 3A, D 70176 STUTTGART, GERMANY SN 0003-9136 J9 ARCH HYDROBIOL JI Arch. Hydrobiol. PD FEB PY 1993 VL 126 IS 4 BP 461 EP 468 PG 8 WC Limnology; Marine & Freshwater Biology SC Marine & Freshwater Biology GA KV677 UT WOS:A1993KV67700006 ER PT J AU KENT, SM RAMELLA, M NONINO, M AF KENT, SM RAMELLA, M NONINO, M TI A SMALL DRIFT SCAN SURVEY FOR GALAXIES IN THE NORTHERN SKY SO ASTRONOMICAL JOURNAL LA English DT Article ID UNIVERSE; CATALOG AB CCD photometry has been obtained for 1054 galaxies to a limiting magnitude r(W) = 18.0 in a narrow strip of the sky 12' wide by 60-degrees long. The data are being used to calibrate photographic photometry as part of a parallel redshift survey, but can also be used to study the projected distribution of galaxies on large angular scales free from systematic effects that are present in photographic surveys. Fluctuations in the number density of order 20% are seen on angular scales of 5-degrees and apparently correlate with the distribution of Abell Clusters that lie within 2-degrees of the strip. C1 HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. OSSERV ASTRON TRIESTE,I-34131 TRIESTE,ITALY. RP KENT, SM (reprint author), FERMILAB NATL ACCELERATOR LAB,MS 127,POB 500,BATAVIA,IL 60510, USA. OI Nonino, Mario/0000-0001-6342-9662 NR 15 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD FEB PY 1993 VL 105 IS 2 BP 393 EP 408 DI 10.1086/116438 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK747 UT WOS:A1993KK74700001 ER PT J AU GAZTANAGA, E YOKOYAMA, J AF GAZTANAGA, E YOKOYAMA, J TI PROBING THE STATISTICS OF PRIMORDIAL ELUCTUATIONS AND THEIR EVOLUTION SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMOLOGY, THEORY; GALAXIES, CLUSTERING; GALAXIES, DISTANCES AND REDSHIFTS; LARGE-SCALE STRUCTURE OF UNIVERSE ID INVARIANT MATTER DISTRIBUTION; LARGE-SCALE STRUCTURE; NONTOPOLOGICAL SOLITONS; DENSITY-FLUCTUATIONS; GALAXY DISTRIBUTION; ZWICKY CATALOG; UNIVERSE; CLUSTERS; VOIDS; SUPERCLUSTER AB The statistical distribution of fluctuations on various scales is analyzed here in terms of the counts in cells of smoothed density fields, using volume-limited samples of galaxy redshift catalogs. It is shown that the distribution on large scales, with volume average of the two-point correlation function of the smoothed field less than or similar to 0.05, is consistent with Gaussian. Statistics are shown to agree remarkably well with the negative binomial distribution, which has hierarchical correlations and a Gaussian behavior at large scales. If these observed properties correspond to the matter distribution, they suggest that our universe started with Gaussian fluctuations and evolved keeping hierarchical form. C1 KYOTO UNIV,YUKAWA INST THEORET PHYS,UJI RES CTR,UJI,KYOTO 611,JAPAN. RP GAZTANAGA, E (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. OI Gaztanaga, Enrique/0000-0001-9632-0815 NR 59 TC 43 Z9 43 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 FEB 1 PY 1993 VL 403 IS 2 BP 450 EP 465 DI 10.1086/172216 PN 1 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ468 UT WOS:A1993KJ46800002 ER PT J AU SANO, T SMITH, CL CANTOR, CR AF SANO, T SMITH, CL CANTOR, CR TI A STREPTAVIDIN MUTANT CONTAINING A CYSTEINE STRETCH THAT FACILITATES PRODUCTION OF A VARIETY OF SPECIFIC STREPTAVIDIN CONJUGATES SO BIO-TECHNOLOGY LA English DT Article ID EXPRESSION; PROTEINS; BINDING; GENE AB The ability to produce specific streptavidin conjugates has been considerably enhanced by using a streptavidin mutant containing a cysteine stretch, in which sulfhydryl groups serve as unique conjugation sites. A streptavidin molecule containing five cysteine residues at its C-terminus, referred to as Stv-28, was efficiently expressed in Escherichia coli, and purified to homogeneity. Purified Stv-28 had full biotin-binding ability and formed a subunit tetramer. Reactive sulfhydryl groups of Stv-28, derived solely from the cysteine stretch, greatly facilitate the specific conjugation of partner molecules to streptavidin by simple sulfhydryl chemistry. In this manner, S-[C-14]carboxymethylated streptavidin and a streptavidin-fluorescein conjugate were prepared. These conjugates contain almost twenty [C-14]carboxymethyl groups and fluorescein molecules, respectively, per subunit tetramer, indicating that the sulfhydryl groups of the cysteine stretch are fully reactive. More importantly, these conjugates retain full biotin-binding ability and form subunit tetramers, suggesting that the fundamental properties of streptavidin would be unaffected by the conjugation of other partner molecules to the C-terminal cysteine stretch. C1 UNIV CALIF BERKELEY,DEPT MOLEC & CELL BIOL,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV STRUCT BIOL,BERKELEY,CA 94720. OI Smith, Cassandra/0000-0002-0346-8907 FU NCI NIH HHS [CA39782] NR 29 TC 12 Z9 12 U1 0 U2 3 PU NATURE PUBLISHING CO PI NEW YORK PA 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 SN 0733-222X J9 BIO-TECHNOL JI Bio-Technology PD FEB PY 1993 VL 11 IS 2 BP 201 EP 206 DI 10.1038/nbt0293-201 PG 6 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA KV062 UT WOS:A1993KV06200025 PM 7763372 ER PT J AU LIGHTWAHL, KJ LOO, JA EDMONDS, CG SMITH, RD WITKOWSKA, HE SHACKLETON, CHL WU, CSC AF LIGHTWAHL, KJ LOO, JA EDMONDS, CG SMITH, RD WITKOWSKA, HE SHACKLETON, CHL WU, CSC TI COLLISIONALLY ACTIVATED DISSOCIATION AND TANDEM MASS-SPECTROMETRY OF INTACT HEMOGLOBIN BETA-CHAIN VARIANT PROTEINS WITH ELECTROSPRAY IONIZATION SO BIOLOGICAL MASS SPECTROMETRY LA English DT Article ID CONFORMATIONAL-CHANGES; INDUCED DECOMPOSITION; SEQUENCE INFORMATION; PROLINE RESIDUES; IONS; PEPTIDE; ELECTROPHORESIS; SPECTRA; FRAGMENTATION; POLYPEPTIDES AB Electrospray ionization collisionally activated dissociation (CAD) mass spectra of multiply charged human hemoglobin beta-chain variant proteins (146 amino acid residues, 15.9 kDa), generated in the atmospheric pressure/vacuum interface and in the collision quadrupole of a triple-quadrupole mass spectrometer, are shown and compared. Several series of structurally informative singly and multiply charged b- and y-mode product ions are observed, with cleavage of the Thr 50-Pro 51 CO-NH bond to produce the complementary y96 and b50 sequence ions as the most favored fragmentation pathway. The eight different beta-globin variants studied differ by a single amino acid substitution and can be differentiated from the observed m/z shifts of the assigned product ions. The overall fragmentation patterns for the variant polypeptides are very similar, with the exception of the Willamette form, in which Arg is substituted for Pro- 51, and multiply charged y96 product ions are not observed. Circular dichroism spectra of normal beta(A) and beta(Willamette) show very little difference under a variety of solvent conditions, indicating that fragmentation differences in their respective CAD mass spectra are substantially governed by primary rather than secondary structure. C1 PACIFIC NW LAB, DEPT CHEM SCI, RICHLAND, WA 99352 USA. CHILDRENS HOSP, OAKLAND RES INST, CLIN MASS SPECTROMETRY FACIL, OAKLAND, CA 94609 USA. UNIV CALIF SAN FRANCISCO, CARDIOVASC RES INST, SAN FRANCISCO, CA 94143 USA. RI Smith, Richard/J-3664-2012 OI Smith, Richard/0000-0002-2381-2349 FU NCRR NIH HHS [RR06505]; NHLBI NIH HHS [HL20985] NR 59 TC 67 Z9 67 U1 0 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1052-9306 J9 BIOL MASS SPECTROM JI Biol. Mass Spectrom. PD FEB PY 1993 VL 22 IS 2 BP 112 EP 120 DI 10.1002/bms.1200220203 PG 9 WC Biophysics; Spectroscopy SC Biophysics; Spectroscopy GA KJ826 UT WOS:A1993KJ82600002 PM 8448219 ER PT J AU ANDERSON, KK HOBBS, JD LUO, L STANLEY, KD QUIRKE, JME SHELNUTT, JA AF ANDERSON, KK HOBBS, JD LUO, L STANLEY, KD QUIRKE, JME SHELNUTT, JA TI STRUCTURAL HETEROGENEITY OF OCTAETHYLPORPHYRINS PROBED BY RESONANCE RAMAN-SPECTROSCOPY SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. FLORIDA INT UNIV,DEPT CHEM,MIAMI,FL 33199. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A156 EP A156 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700891 ER PT J AU BAGLEY, KA VANGARDEREN, C ALBRACHT, SPJ WOODRUFF, WH AF BAGLEY, KA VANGARDEREN, C ALBRACHT, SPJ WOODRUFF, WH TI INFRARED STUDIES ON THE INTERACTION OF CARBON-MONOXIDE WITH NICKEL IN HYDROGENASE SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NR 0 TC 0 Z9 0 U1 0 U2 5 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A276 EP A276 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701581 ER PT J AU BARKIGIA, KM GUDOWSKANOWAK, E RENNER, MW SHIAU, FY SMITH, KM FAJER, J AF BARKIGIA, KM GUDOWSKANOWAK, E RENNER, MW SHIAU, FY SMITH, KM FAJER, J TI CONFORMATIONAL SURFACES OF PHOTOSYNTHETIC CHROMOPHORES - PLANAR AND RUFFLED CONFORMERS OF PYROPHEOPHORBIDE DERIVATIVES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,UPTON,NY 11973. RI Gudowska-Nowak, Ewa/A-7622-2014 OI Gudowska-Nowak, Ewa/0000-0001-5604-094X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A131 EP A131 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700747 ER PT J AU DAYHOFF, JE HAMEROFF, SR LAHOZBELTRA, R RASMUSSEN, S SWENBERG, CE AF DAYHOFF, JE HAMEROFF, SR LAHOZBELTRA, R RASMUSSEN, S SWENBERG, CE TI CYTOSKELETAL MODELS FOR SIGNAL TRANSMISSION AND INTRACELLULAR PROTEIN INTERACTIONS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV MARYLAND,COLL PK,MD 20742. UNIV ARIZONA,TUCSON,AZ 85721. UNIV COMPLUTENSE MADRID,MADRID 3,SPAIN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. AFRRI,BETHESDA,MD. NR 0 TC 0 Z9 0 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 FEB PY 1993 VL 64 IS 2 BP A262 EP A262 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701505 ER PT J AU ERKKILA, KE MARTINEZ, SL MEDFORTH, CJ SMITH, KM SHELNUTT, JA AF ERKKILA, KE MARTINEZ, SL MEDFORTH, CJ SMITH, KM SHELNUTT, JA TI BIOMIMETIC ISOPENTANE HYDROXYLATION CATALYZED BY NONPLANAR DODECA-SUBSTITUTED IRON PORPHYRINS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV CALIF DAVIS,DAVIS,CA 96616. RI Shelnutt, John/A-9987-2009; Smith, Kevin/G-1453-2011 OI Shelnutt, John/0000-0001-7368-582X; Smith, Kevin/0000-0002-6736-4779 NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A156 EP A156 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700892 ER PT J AU FUCIARELLI, AF SISK, EC MILLER, JH ZIMBRICK, JD AF FUCIARELLI, AF SISK, EC MILLER, JH ZIMBRICK, JD TI ELECTRON MIGRATION IN GAMMA-IRRADIATED SOLUTIONS OF DNA SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A265 EP A265 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701524 ER PT J AU GOLDEN, BL HOFFMAN, DW RAMAKRISHNAN, V WHITE, SW AF GOLDEN, BL HOFFMAN, DW RAMAKRISHNAN, V WHITE, SW TI STRUCTURAL STUDIES ON ISOLATED COMPONENTS OF THE PROKARYOTIC RIBOSOME - RIBOSOMAL PROTEIN-S17 AND PROTEIN-L6 SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 DUKE UNIV,MED CTR,DURHAM,NC 27710. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A57 EP A57 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700315 ER PT J AU GONCZ, KK MORONNE, MM ROTHMAN, SS AF GONCZ, KK MORONNE, MM ROTHMAN, SS TI EFFECTS OF THE MEMBRANE BARRIER, MASS-ACTION AND INTERNAL BINDING ON RELEASE OF PROTEIN FROM SECRETION GRANULES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UCB,BERKELEY,CA 94720. LBL,BERKELEY,CA 94720. UCSF,SAN FRANCISCO,CA 94143. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A194 EP A194 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701117 ER PT J AU HAMEROFF, SR DAYHOFF, J LAHOZBELTRA, R RASMUSSEN, S SAMSONOVICH, A KORUGA, D AF HAMEROFF, SR DAYHOFF, J LAHOZBELTRA, R RASMUSSEN, S SAMSONOVICH, A KORUGA, D TI COMMUNICATION IN THE CYTOSKELETON SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV ARIZONA,TUCSON,AZ 85721. UNIV MARYLAND,COLL PK,MD 20742. UNIV COMPLUTENSE MADRID,MADRID 3,SPAIN. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A76 EP A76 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700426 ER PT J AU HOBBS, JD MAJUMDER, SA LUO, L ALLENSICKELSMITH, GH QUIRKE, JME SHELNUTT, JA AF HOBBS, JD MAJUMDER, SA LUO, L ALLENSICKELSMITH, GH QUIRKE, JME SHELNUTT, JA TI STRUCTURE AND LIGAND-BINDING PROPERTIES OF NONPLANAR, MESOSUBSTITUTED NICKEL(II) OCTAETHYLPORPHYRINS - A POSSIBLE MODEL FOR COFACTOR F430 SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. FLORIDA INT UNIV,DEPT CHEM,MIAMI,FL 33199. RI Shelnutt, John/A-9987-2009 OI Shelnutt, John/0000-0001-7368-582X NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A155 EP A155 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700890 ER PT J AU KNOWLES, D NARLA, M CHASIS, J EVANS, E AF KNOWLES, D NARLA, M CHASIS, J EVANS, E TI RECEPTOR IMMOBILIZATION AND MEMBRANE RIGIDIFICATION IN HUMAN ERYTHROCYTES INDUCED BY LIGAND-BINDING - A MODEL FOR TRANSMEMBRANE SIGNALING SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV BRITISH COLUMBIA,VANCOUVER V6T 1W5,BC,CANADA. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 1 Z9 1 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A385 EP A385 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51702219 ER PT J AU KOLACZKOWSKI, SV LYLE, PA SMALL, GJ AF KOLACZKOWSKI, SV LYLE, PA SMALL, GJ TI SPECTRAL HOLE BURNING AS A PROBE OF AMORPHOUS DISORDER IN THE PRIMARY ELECTRON-TRANSFER OF BACTERIAL REACTION CENTERS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 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 BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A133 EP A133 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700757 ER PT J AU MAJUMDER, SA HOBBS, JD FERREIRA, GC ONDRIAS, MR SHELNUTT, JA AF MAJUMDER, SA HOBBS, JD FERREIRA, GC ONDRIAS, MR SHELNUTT, JA TI RESONANCE RAMAN-SPECTROSCOPY OF NICKEL PORPHYRINS IN DIFFERENT ENVIRONMENTS AS MODELS FOR FERROCHELATASE SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131. UNIV S FLORIDA,DEPT BIOCHEM & MOLEC BIOL,TAMPA,FL 33612. RI Shelnutt, John/A-9987-2009; Ferreira, Gloria/A-4709-2012 OI Shelnutt, John/0000-0001-7368-582X; NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A156 EP A156 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700894 ER PT J AU MAKHOV, AM TRUS, BL CONWAY, JF SIMON, MN ZURABISHVILI, TG MESYANZHINOV, VV STEVEN, AC AF MAKHOV, AM TRUS, BL CONWAY, JF SIMON, MN ZURABISHVILI, TG MESYANZHINOV, VV STEVEN, AC TI MOLECULAR-STRUCTURE AND CONFORMATIONAL SWITCHING OF A VIRAL ADHESIN SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 NIAMS,LSBR,BETHESDA,MD 20892. NIH,CSL,DCRT,BETHESDA,MD 20892. IVANOVSKY INST,MOSCOW 123098,RUSSIA. BROOKHAVEN NATL LAB,UPTON,NY 10973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A64 EP A64 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700356 ER PT J AU MEDFORTH, CJ SPARKS, LD RODRIGUEZ, MR SMITH, KM SHELNUTT, JA AF MEDFORTH, CJ SPARKS, LD RODRIGUEZ, MR SMITH, KM SHELNUTT, JA TI SOLUTION CONFORMATIONS OF DODECA-SUBSTITUTED PORPHYRINS DETERMINED FROM COBALT (II) PARAMAGNETIC NMR SHIFTS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 SANDIA NATL LABS,DEPT FUEL SCI 6211,ALBUQUERQUE,NM 87185. UNIV CALIF DAVIS,DEPT CHEM,DAVIS,CA 95616. RI Shelnutt, John/A-9987-2009; Smith, Kevin/G-1453-2011 OI Shelnutt, John/0000-0001-7368-582X; Smith, Kevin/0000-0002-6736-4779 NR 0 TC 0 Z9 0 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 FEB PY 1993 VL 64 IS 2 BP A156 EP A156 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700895 ER PT J AU MILLER, RT DUNKER, AK DOUTHART, RJ AF MILLER, RT DUNKER, AK DOUTHART, RJ TI A SET OF DISTINGUISHABLE AMINO-ACID CONFORMATIONS IN PROTEIN SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 WASHINGTON STATE UNIV, DEPT BIOCHEM & BIOPHYS, PULLMAN, WA 99164 USA. PACIFIC NW LAB, CTR LIFE SCI, RICHLAND, WA 99352 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A172 EP A172 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700986 ER PT J AU OLAH, GA MITCHELL, RD SOSNICK, TR WALSH, DA TREWHELLA, J AF OLAH, GA MITCHELL, RD SOSNICK, TR WALSH, DA TREWHELLA, J TI THE SOLUTION STRUCTURE OF THE CAMP-DEPENDENT PROTEIN-KINASE CATALYTIC SUBUNIT AND ITS ALTERATION UPON BINDING OF THE PROTEIN-KINASE INHIBITOR PEPTIDE SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,DIV ISOTOPE & NUCL CHEM,LOS ALAMOS,NM 87544. UNIV CALIF DAVIS,DEPT BIOL CHEM,DAVIS,CA 95616. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A371 EP A371 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51702137 ER PT J AU POLEWSKI, K SUTHERLAND, JC AF POLEWSKI, K SUTHERLAND, JC TI EXCITED-STATES OF MATRIX-ISOLATED GUANINE - ABSORPTION, FLUORESCENCE, AND LIFETIME MEASUREMENTS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 0 TC 0 Z9 0 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 FEB PY 1993 VL 64 IS 2 BP A164 EP A164 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700943 ER PT J AU SAXENA, AM AF SAXENA, AM TI SMALL-ANGLE NEUTRON-SCATTERING STUDIES OF ALLOPHYCOCYANIN AND ITS SUBUNITS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A171 EP A171 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700984 ER PT J AU SELVIN, PR RANA, T KLEIN, MP HEARST, JE AF SELVIN, PR RANA, T KLEIN, MP HEARST, JE TI DARK-BACKGROUND FLUORESCENCE ENERGY-TRANSFER USING LANTHANIDE CHELATES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,CALVIN LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A243 EP A243 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701395 ER PT J AU SNYDER, S MORRIS, A BONDESON, S ZHANG, Y DUTTON, PL GUNNER, M NORRIS, JR THURNAUER, MC AF SNYDER, S MORRIS, A BONDESON, S ZHANG, Y DUTTON, PL GUNNER, M NORRIS, JR THURNAUER, MC TI ELECTRON-SPIN POLARIZATION IN IRON-CONTAINING BACTERIAL REACTION CENTERS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 ARGONNE NATL LAB,ARGONNE,IL 60439. HOSP UNIV PENN,PHILADELPHIA,PA 19104. CUNY,NEW YORK,NY 10031. NR 0 TC 1 Z9 1 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 FEB PY 1993 VL 64 IS 2 BP A216 EP A216 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701244 ER PT J AU SUTHERLAND, JC AF SUTHERLAND, JC TI QUANTITATIVE IMAGING OF ELECTROPHORETIC GELS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A21 EP A21 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700112 ER PT J AU TERWILLIGER, TC GOUDREAU, PN AF TERWILLIGER, TC GOUDREAU, PN TI STRUCTURAL BASIS FOR GENE-V PROTEIN COOPERATIVITY SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV CHICAGO,CHICAGO,IL 60637. RI Terwilliger, Thomas/K-4109-2012 OI Terwilliger, Thomas/0000-0001-6384-0320 NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A249 EP A249 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701431 ER PT J AU WANG, Q SCHOENLEIN, RW PETEANU, LA MATHIES, RA SHANK, CV AF WANG, Q SCHOENLEIN, RW PETEANU, LA MATHIES, RA SHANK, CV TI FEMTOSECOND DYNAMICS OF THE CIS-TRANS-ISOMERIZATION IN RHODOPSIN - TE 1ST STEP IN VISION SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. RI Schoenlein, Robert/D-1301-2014 OI Schoenlein, Robert/0000-0002-6066-7566 NR 1 TC 1 Z9 1 U1 2 U2 4 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A127 EP A127 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51700723 ER PT J AU WANG, X JIA, Y ZHANG, Y THERNAUER, M NORRIS, JR FLEMING, GR WRAIGHT, CA AF WANG, X JIA, Y ZHANG, Y THERNAUER, M NORRIS, JR FLEMING, GR WRAIGHT, CA TI SPECTROSCOPIC, KINETIC AND THERMODYNAMIC PROPERTIES OF THE MUTATION L121(PHE-GREATER-THAN-HIS) IN REACTION CENTERS OF RHODOBACTER-SPHAEROIDES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV ILLINOIS,CHICAGO,IL 60680. UNIV CHICAGO,CHICAGO,IL 60637. ARGONNE NATL LAB,ARGONNE,IL 60439. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A215 EP A215 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701240 ER PT J AU WOLF, SG MOSSER, G DOWNING, KH AF WOLF, SG MOSSER, G DOWNING, KH TI AN ELECTRON CRYSTALLOGRAPHIC STUDY OF TUBULIN CRYSTAL FORMS SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,DONNER LAB,DIV SCI,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 3 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1993 VL 64 IS 2 BP A262 EP A262 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701504 ER PT J AU WORCESTER, DL MICHALSKI, TJ KATZ, JJ AF WORCESTER, DL MICHALSKI, TJ KATZ, JJ TI CYLINDRICAL AGGREGATES OF PYROCHLOROPHYLL-A COMPARED WITH AGGREGATES OF BACTERIOCHLOROPHYLL-C - MODELS FOR ANTENNA CHLOROPHYLL IN CHLOROFLEXUS AND CHLOROBIUM SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 UNIV MISSOURI,DIV BIOL,COLUMBIA,MO 65201. ARGONNE NATL LAB,DIV CHEM,ARGONNE,IL 60439. NR 2 TC 0 Z9 0 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 FEB PY 1993 VL 64 IS 2 BP A215 EP A215 PN 2 PG 1 WC Biophysics SC Biophysics GA KP517 UT WOS:A1993KP51701242 ER PT J AU EICHINGER, WE COOPER, DI HOLTKAMP, DB KARL, RR QUICK, CR TIEE, JJ AF EICHINGER, WE COOPER, DI HOLTKAMP, DB KARL, RR QUICK, CR TIEE, JJ TI DERIVATION OF WATER-VAPOR FLUXES FROM LIDAR MEASUREMENTS SO BOUNDARY-LAYER METEOROLOGY LA English DT Article ID PLANETARY BOUNDARY-LAYER; RAMAN LIDAR; VELOCITY; TEMPERATURE; PROFILES; WIND AB Two techniques are described by which the flux of water vapor can be derived from concentration measurements made by a Raman-Lidar. Monin-Obukhov similarity theory and dissipation techniques are used as the basis for these methods. The resulting fluxes are compared to fluxes from standard point instruments. The techniques described are appropriate for measuring the flux of any scalar quantity using Lidar measurements in the inner region of the boundary layer. RP EICHINGER, WE (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 32 TC 14 Z9 14 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0006-8314 J9 BOUND-LAY METEOROL JI Bound.-Layer Meteor. PD FEB PY 1993 VL 63 IS 1-2 BP 39 EP 64 DI 10.1007/BF00705376 PG 26 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL289 UT WOS:A1993KL28900003 ER PT J AU PHILLIPS, WS KINOSHITA, S FUJIWARA, H AF PHILLIPS, WS KINOSHITA, S FUJIWARA, H TI BASIN-INDUCED LOVE WAVES OBSERVED USING THE STRONG-MOTION ARRAY AT FUCHU, JAPAN SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID SEDIMENT-FILLED VALLEYS; INCIDENT SH-WAVES; 1971 SAN-FERNANDO; POLARIZATION ANALYSIS; SEISMIC RESPONSE; KANTO-DISTRICT; HIGH-FREQUENCY; CODA WAVES; P-WAVES; EARTHQUAKE AB Phases have been observed in the S-wave coda of local earthquakes recorded at the Fuchu strong-motion array, located in the Kanto basin in the western suburbs of Tokyo, Japan. These phases are often larger than the direct S-wave at a period of 1 sec. Because these phases are observed only on horizontal components at surface sites and are weakly observed at only the shallowest (150 m) of a number of borehole sites, they are interpreted as Love waves. Particle motions indicate significantly off-azimuth travel directions. The Fuchu array is too sparse to allow the application of standard array analysis to determine the origin of these phases. Instead, we use a combination of three-component polarization, enveloping, and slant-stack techniques that allows propagation directions to be reasonably well determined (+/-10-degrees); however, group slownesses are more difficult to obtain precisely (1 to 2 sec / km). Using these results and assuming that the Love waves are generated by the scattering of S-waves at the Earth's surface, we estimate locations of scattering points. We find that the scattering occurs along a short segment of the Kanto basin boundary for widely distributed earthquake source locations. We believe that this segment is important because it is the closest part of the basin boundary to the observation sites. The existence of these basin-induced Love waves violates backscattering models for the generation of the coda of local earthquakes. This must be kept in mind when applying coda techniques to sediment basin sites at periods of 1 sec or more. C1 NATL RES INST EARTH SCI & DISASTER PREVENT,TSUKUBA,JAPAN. RP PHILLIPS, WS (reprint author), LOS ALAMOS NATL LAB,MS D443,LOS ALAMOS,NM 87545, USA. NR 73 TC 22 Z9 22 U1 0 U2 0 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 FEB PY 1993 VL 83 IS 1 BP 64 EP 84 PG 21 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KL912 UT WOS:A1993KL91200006 ER PT J AU SMITH, AT AF SMITH, AT TI DISCRIMINATION OF EXPLOSIONS FROM SIMULTANEOUS MINING BLASTS SO BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA LA English DT Article ID QUARRY BLASTS; EARTHQUAKES AB Large mining blasts can complicate the identification and discrimination of small underground nuclear explosions and may offer evasion opportunities. Mining blasts typically show a unique spectral signature: spectral reinforcements associated with lime-delayed detonations between adjacent shot holes or rows of shots. Discrimination of a nuclear detonation that is simultaneous with a mining blast must depend upon recognizing significant spectral or waveform abnormalities within seismic signals from the mining blasts. In this investigation, large, simultaneous detonations within mining blasts are simulated for observed explosions from the Mesabi Range in Minnesota and for a series of quarry blasts at the Kaiser Permanente Quarry in Cupertino, California, which included a simultaneous detonation conducted by Lee et al. (1989). The Mesabi explosions are examples of large, ripple-fired blasts with known blast patterns (Smith, 1989). The models suggest that a large, single, deeply buried explosion dominates the waveform signature if it contains more than 5 to 15% of the total explosive in the mining blast. Spectral signatures of these combined explosions still show periodicities characteristic of ripple firing; however, their amplitude is greatly reduced. Inclusion of a deep simultaneous shot accentuates the high-frequency spectrum. If single explosions are sufficiently close to the combined quarry blast, their application as empirical Green's functions can isolate the simultaneous explosion within the blast. If empirical Green's functions are within 0.5 km of quarry blasts, individual explosions can be retrieved if delays are 100 msec between shot holes and signals extend to 40 Hz. Identification of large, simultaneous detonations within a blast may depend upon knowledge of the mine's blasting practices and its variability from blast to blast. RP SMITH, AT (reprint author), LAWRENCE LIVERMORE NATL LAB,TREATY VERIFICAT PROGRAM,L-205,POB 808,LIVERMORE,CA 94550, USA. NR 18 TC 17 Z9 18 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 FEB PY 1993 VL 83 IS 1 BP 160 EP 179 PG 20 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KL912 UT WOS:A1993KL91200011 ER PT J AU THRING, RW CHORNET, E OVEREND, RP AF THRING, RW CHORNET, E OVEREND, RP TI FRACTIONATION OF WOODMEAL BY PREHYDROLYSIS AND THERMAL ORGANOSOLV PROCESS STRATEGY, RECOVERY OF CONSTITUENTS, AND SOLVENT FRACTIONATION OF LIGNINS SO PRODUCED SO CANADIAN JOURNAL OF CHEMICAL ENGINEERING LA English DT Article DE FRACTIONATION; PREHYDROLYSIS; SOLVOLYSIS; THERMOMECHANO-SOLVOLYTIC TREATMENT; LIGNIN RECOVERY ID ETHYLENE-GLYCOL; LIGNOCELLULOSICS; PRETREATMENT; LIQUEFACTION; BIOMASS AB A prototype hardwood Populus deltoides has been fractionated in kg quantities into its primary constitutive polymers, namely, cellulose, hemicelluloses, and lignin, under optimal recovery conditions for each fraction. Our approach is targeted at processing sawdust or finally divided wood (d(p) less-than-or-equal-to 0.5 mm) and involves a thermomechano-solvolytic treatment of medium consistency suspensions in two process development units operated sequentially. Firstly, the hemicellulose fraction is removed from the initial wood by a aqueous-steam pretreatment (autohydrolysis) at conditions where nearly 90% of the hemicelluloses are solubilized. Secondly, the treated wood (lignocellulose) is separated into cellulose and lignin rich fractions by subjecting it to an organosolvolytic treatment using ethylene glycol as solvent. An experimental unit which can be operated in semi-continuous or continuous modes is described and was employed for this step. The recovery of each fraction via appropriate mass balances is presented. Also, a comparative characterization of the lignins isolated via (a) the direct solvolysis route and (b) the sequential aqueous-steam pretreatment followed by solvolysis approach is made using solvent fractionation, molar mass distribution, and C-13 NMR spectroscopy methods. C1 UNIV SHERBROOKE, DEPT CHEM ENGN, SHERBROOKE J1K 2R1, QUEBEC, CANADA. NATL RENEWABLE ENERGY LAB, GOLDEN, CO USA. OI Overend, Ralph/0000-0002-5442-0890 NR 24 TC 13 Z9 13 U1 1 U2 11 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0008-4034 EI 1939-019X J9 CAN J CHEM ENG JI Can. J. Chem. Eng. PD FEB PY 1993 VL 71 IS 1 BP 116 EP 123 PG 8 WC Engineering, Chemical SC Engineering GA KQ143 UT WOS:A1993KQ14300015 ER PT J AU LIU, P SICILIANO, J SEONG, D CRAIG, J ZHAO, Y DEJONG, PJ SICILIANO, MJ AF LIU, P SICILIANO, J SEONG, D CRAIG, J ZHAO, Y DEJONG, PJ SICILIANO, MJ TI DUAL ALU POLYMERASE CHAIN-REACTION PRIMERS AND CONDITIONS FOR ISOLATION OF HUMAN-CHROMOSOME PAINTING PROBES FROM HYBRID-CELLS SO CANCER GENETICS AND CYTOGENETICS LA English DT Article ID FLUORESCENCE INSITU HYBRIDIZATION; PCR PRODUCTS; HUMAN GENOME; DNA; LIBRARIES; CLONING; AMPLIFICATION; SEQUENCES; MARKERS; LINES AB A method for rapid and efficient production of chromosome- and chromosome-region specific probes for fluorescent in situ hybridization (FISH) detectable by simple fluorescent microscopy is described. The procedure is based on simultaneous use of two inter-Alu-polymerase chain reaction (PCR) primers for extraction of highly heterogeneous human DNA from interspecific somatic cell hybrids containing the chromosome regions of interest. Probes so produced do not hybridize to centromeric sequences and simultaneously band the target chromosomes, making them useful for unambiguous identification of chromosomal elements and breakpoints associated with cancer. C1 UNIV TEXAS,MD ANDERSON CANC CTR,DEPT MOLECUL GENET,HOUSTON,TX 77030. UNIV TEXAS,MD ANDERSON CANC CTR,DEPT HEMATOL,HOUSTON,TX 77030. LAWRENCE LIVERMORE NATL LAB,CTR HUMAN GENOME,LIVERMORE,CA 94550. RI Liu, Paul/A-7976-2012; Liu, Pingsheng/B-7124-2012 OI Liu, Paul/0000-0002-6779-025X; FU NCI NIH HHS [CA55164]; NIGMS NIH HHS [GM 34936] NR 21 TC 90 Z9 90 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0165-4608 J9 CANCER GENET CYTOGEN JI Cancer Genet. Cytogenet. PD FEB PY 1993 VL 65 IS 2 BP 93 EP 99 DI 10.1016/0165-4608(93)90213-6 PG 7 WC Oncology; Genetics & Heredity SC Oncology; Genetics & Heredity GA KU979 UT WOS:A1993KU97900003 PM 8453610 ER PT J AU HALOW, JS FASCHING, GE NICOLETTI, P SPENIK, JL AF HALOW, JS FASCHING, GE NICOLETTI, P SPENIK, JL TI OBSERVATIONS OF A FLUIDIZED-BED USING CAPACITANCE IMAGING SO CHEMICAL ENGINEERING SCIENCE LA English DT Article AB The Morgantown Energy Technology Center has developed a unique method for imaging voidage distributions within fluidized beds. This system allows high-speed three-dimensional imaging of the voidage distribution in a bed to be recorded. From these imaging data a variety of visualizations can be constructed and quantitative information extracted. Five materials with differing particle shapes and sizes were fluidized and imaged in a 15.24 cm diameter bed over a range of superficial velocities. The imaging revealed a variety of bubble sizes and shapes depending on the material and velocity. Bubble properties including a frontal diameter, length, velocity and spacing were determined. A correlation of bubble rise velocity developed from an earlier study was modified to include the bubble length as the primary dimension defining the bubble. The imaging also revealed detailed voidage distributions around bubbles and slugs. These images show round-nose bubbles and slugs for the fine materials examined. With the coarser materials, a very blunt slug was common. The technique has the potential to substantially improve design and scale-up of fluidized beds and other gas-solid systems by providing a detailed understanding of voidage distributions in these systems. C1 EG&G WASHINGTON ANALYT SERV CTR INC,MORGANTOWN,WV. OAK RIDGE ASSOCIATED UNIV,MORGANTOWN,WV. RP HALOW, JS (reprint author), US DOE,MORGANTOWN,WV 26505, USA. NR 7 TC 54 Z9 56 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0009-2509 J9 CHEM ENG SCI JI Chem. Eng. Sci. PD FEB PY 1993 VL 48 IS 4 BP 643 EP 659 DI 10.1016/0009-2509(93)80133-B PG 17 WC Engineering, Chemical SC Engineering GA KH769 UT WOS:A1993KH76900002 ER PT J AU WILLIAMS, PT KRAUSS, RM STEFANICK, ML VRANIZAN, KM WOOD, PD AF WILLIAMS, PT KRAUSS, RM STEFANICK, ML VRANIZAN, KM WOOD, PD TI EFFECTS OF LOW-FAT DIET, CALORIE RESTRICTION AND RUNNING ON HIGH-DENSITY-LIPOPROTEIN (HDL) SUBFRACTION CONCENTRATIONS IN MODERATELY OVERWEIGHT MEN SO CIRCULATION LA English DT Meeting Abstract C1 LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD FEB PY 1993 VL 87 IS 2 BP 681 EP 681 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA KL647 UT WOS:A1993KL64700063 ER PT J AU PASTOR, J POST, WM AF PASTOR, J POST, WM TI LINEAR REGRESSIONS DO NOT PREDICT THE TRANSIENT RESPONSES OF EASTERN NORTH-AMERICAN FORESTS TO CO2-INDUCED CLIMATE CHANGE SO CLIMATIC CHANGE LA English DT Article ID MODEL; SOIL; CO2 AB Previous research has shown that various fluxes of carbon from and into ecosystems are correlated with summary climatic measures, such as actual evapotranspiration (AET). The best known of these is a regression of net primary production of terrestrial vegetation against AET published by Rosenzweig (1968). Rosenzweig intended this regression to represent steady state relationships of net primary production to climate. Nevertheless, it is tempting to use such regressions to predict transient responses of carbon flux to climate change, and several models take such an approach. Here, using a more detailed ecosystems model, we show that lags in population responses to climate change and non-linear changes in soil nitrogen availability that limit tree growth cause large departures from this regression during the transition between current climate and a 2 X CO2 climate. Simple models that do not consider population or soil dynamics may err when applied to the period of transition during a changing climate. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RP PASTOR, J (reprint author), UNIV MINNESOTA,NAT RESOURCES RES INST,DULUTH,MN 55811, USA. RI Post, Wilfred/B-8959-2012; Pastor, John/F-6241-2011 NR 30 TC 20 Z9 20 U1 0 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0165-0009 J9 CLIMATIC CHANGE JI Clim. Change PD FEB PY 1993 VL 23 IS 2 BP 111 EP 119 DI 10.1007/BF01097332 PG 9 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA KM411 UT WOS:A1993KM41100002 ER PT J AU GUTHRIE, M CARDENAS, D ESCHBACH, JW HALEY, NR ROBERTSON, HT EVANS, RW AF GUTHRIE, M CARDENAS, D ESCHBACH, JW HALEY, NR ROBERTSON, HT EVANS, RW TI EFFECTS OF ERYTHROPOIETIN ON STRENGTH AND FUNCTIONAL STATUS OF PATIENTS ON HEMODIALYSIS SO CLINICAL NEPHROLOGY LA English DT Article DE ERYTHROPOIETIN; FUNCTIONAL ABILITY; MUSCLE STRENGTH; QUALITY OF LIFE ID RECOMBINANT HUMAN ERYTHROPOIETIN; STAGE RENAL-DISEASE; CLINICAL-TRIAL; EXERCISE; QUALITY; LIFE; DIALYSIS; CAPACITY; ANEMIA AB The strength, endurance, and functional status of 15 anemic (HCT 21.2 +/- 4.6) hemodialysis patients was quantified prior to the administration of erythropoietin (epoetin) and after the anemia was partially corrected (HCT 35.4 +/- 2.3). Subjects showed significant increases in strength, measured isometrically (p <.01) and isokinetically (p <.01 at four of five speeds). They also demonstrated improved endurance and rated their functional ability higher. Anemia contributes to significant debilitation in hemodialysis patients and, when reversed with epoetin therapy, results in significantly improved muscle function and endurance. C1 UNIV WASHINGTON,DEPT MED,DIV PULM & CRIT CARC MED,SEATTLE,WA 98195. UNIV WASHINGTON,DEPT MED,DIV HEMATOL,SEATTLE,WA 98195. BATELLE SEATTLE RES CTR,SEATTLE,WA. RP GUTHRIE, M (reprint author), UNIV WASHINGTON,SCH MED,DEPT REHABIL MED,RJ-30,SEATTLE,WA 98195, USA. FU NIDDK NIH HHS [DK 19410]; PHS HHS [FR 0037] NR 24 TC 43 Z9 45 U1 0 U2 0 PU DUSTRI-VERLAG DR KARL FEISTLE PI MUNCHEN-DEISENHOFEN PA BAHNHOFSTRABE 9 POSTFACH 49, W-8024 MUNCHEN-DEISENHOFEN, GERMANY SN 0301-0430 J9 CLIN NEPHROL JI Clin. Nephrol. PD FEB PY 1993 VL 39 IS 2 BP 97 EP 102 PG 6 WC Urology & Nephrology SC Urology & Nephrology GA KP702 UT WOS:A1993KP70200008 PM 8448925 ER PT J AU RIDER, WJ AF RIDER, WJ TI A COMPARISON OF TVD LAX-WENDROFF METHODS SO COMMUNICATIONS IN NUMERICAL METHODS IN ENGINEERING LA English DT Article ID HYPERBOLIC CONSERVATION-LAWS; HIGH-RESOLUTION SCHEMES; DIFFERENCE-SCHEMES; FLOWS AB This paper compares two formulations of Lax-Wendroff TVD methods. The basis of comparison is to the results of several test problems providing both qualitative and quantitative results. Results show that using an upwind biased limiter provides higher resolution of both smooth and discontinuous solutions from a lower amount of induced numerical viscosity. The conclusion is that a limiter should have as small a support as possible in order to limit its effects if high resolution is the object. RP RIDER, WJ (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 17 TC 3 Z9 3 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1069-8299 J9 COMMUN NUMER METH EN JI Commun. Numer. Methods Eng. PD FEB PY 1993 VL 9 IS 2 BP 147 EP 155 DI 10.1002/cnm.1640090208 PG 9 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA KU853 UT WOS:A1993KU85300007 ER PT J AU MACADAM, SS STRINGER, J AF MACADAM, SS STRINGER, J TI TEMPERATURE-DEPENDENCE OF STEEL WASTAGE IN A BUBBLING FLUIDIZED-BED SIMULATOR SO CORROSION LA English DT Article DE DEPOSITION; FLUIDIZED BED COMBUSTION; OXIDATION; TEMPERATURE DEPENDENCE; WASTAGE AB Tubes within bubbling fluidized bed combustors have in many instances suffered wastage. The wastage can be quite high at temperatures near 300-degrees-C, but it typically shows an abrupt decrease at approximately 400-degrees-C. Superheater tubes that operate at higher temperatures generally do not experience wastage. It is widely believed that this decrease in wastage with temperature Is due to the development of a continuous oxide layer that protects the metal substrate by virtue of its hardness and resistance to spalling. In this study, the temperature effect is examined using a wear rig specially designed to simulate the impact conditions relevant to in-bed tubes. ft was discovered that wastage for mild steel can decrease from a relatively high value to essential zero within the temperature range of 400 to 430-degrees-C. This decrease was attributable not to the presence of an oxide scale but to the development of a protective deposit layer. The deposit consisted of an agglomeration of submicron bed material particles. The submicron dust is created through the normal attrition process and it tends to form an adherent coating on the bulk bed particles. Deposition on the specimen occurs by transfer of agglomerated material from bulk particles during impact Subsequent impacts compact the deposit into a continuous protective layer. C1 ELECT POWER RES INST,PALO ALTO,CA 94304. RP MACADAM, SS (reprint author), LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720, USA. NR 28 TC 10 Z9 11 U1 0 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD FEB PY 1993 VL 49 IS 2 BP 156 EP 169 PG 14 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA KT142 UT WOS:A1993KT14200010 ER PT J AU MAZUR, P COLE, KW SCHREUDERS, PD MAHOWALD, AP AF MAZUR, P COLE, KW SCHREUDERS, PD MAHOWALD, AP TI CONTRIBUTIONS OF COOLING AND WARMING RATE AND DEVELOPMENTAL STAGE TO THE SURVIVAL OF DROSOPHILA EMBRYOS COOLED TO -205-DEGREES-C SO CRYOBIOLOGY LA English DT Article ID MELANOGASTER EMBRYOS; MOUSE EMBRYOS; CRYOPRESERVATION; VITRIFICATION; FROZEN; ERYTHROCYTES; FRACTION C1 OAK RIDGE NATL LAB,DIV BIOL,OAK RIDGE,TN 37831. UNIV CHICAGO,DEPT MOLEC GENET & CELL BIOL,CHICAGO,IL 60637. RP MAZUR, P (reprint author), UNIV TENNESSEE,OAK RIDGE GRAD SCH BIOMED SCI,OAK RIDGE,TN 37831, USA. NR 34 TC 28 Z9 30 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 0011-2240 J9 CRYOBIOLOGY JI Cryobiology PD FEB PY 1993 VL 30 IS 1 BP 45 EP 73 DI 10.1006/cryo.1993.1006 PG 29 WC Biology; Physiology SC Life Sciences & Biomedicine - Other Topics; Physiology GA KK466 UT WOS:A1993KK46600006 PM 8440129 ER PT J AU DEANGELIS, DL HUSTON, MA AF DEANGELIS, DL HUSTON, MA TI FURTHER CONSIDERATIONS ON THE DEBATE OVER HERBIVORE OPTIMIZATION THEORY SO ECOLOGICAL APPLICATIONS LA English DT Article DE COMPENSATION AND OVERCOMPENSATION; GRASSLANDS; GRAZING; HERBIVORE; HERBIVORE OPTIMIZATION THEORY; HERBIVORY; HIERARCHICAL LEVELS; PRIMARY PRODUCTION; RANGELANDS ID MODEL; SUCCESSION; GRASSLAND AB Criticism of the basis and use of the herbivore optimization theory is discussed. It is argued here that evidence from theory and agricultural practice support the view that compensation and overcompensation of total primary production can occur in plant populations and communities subjected to grazing. However, whether this will occur depends on specific circumstances. Modeling and carefully designed field studies should be used to determine the responses of rangeland systems under a variety of environmental conditions and grazing intensities. RP DEANGELIS, DL (reprint author), OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831, USA. RI Huston, Michael/B-1434-2009 OI Huston, Michael/0000-0001-9513-1166 NR 18 TC 9 Z9 11 U1 0 U2 5 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 1051-0761 J9 ECOL APPL JI Ecol. Appl. PD FEB PY 1993 VL 3 IS 1 BP 30 EP 31 DI 10.2307/1941786 PG 2 WC Ecology; Environmental Sciences SC Environmental Sciences & Ecology GA LN263 UT WOS:A1993LN26300008 PM 27759233 ER PT J AU MILLS, E PIETTE, MA AF MILLS, E PIETTE, MA TI ADVANCED ENERGY-EFFICIENT LIGHTING SYSTEMS - PROGRESS AND POTENTIAL SO ENERGY LA English DT Article AB From a systems perspective, energy-efficient design should strive to minimize the energy and money required to provide the desired quantity and quality of illumination. A wide spectrum of technologies, design practices, and control strategies exists to increase lighting energy efficiency. We describe the state of the art in energy-efficient lighting (emphasizing field operating conditions rather than product test results) and give an overview of its benefits. We consider existing and emerging lighting components: lamps, ballasts, fixtures, controls, and design issues as well as other building systems and features with which lighting interacts, including HVAC systems. Estimates of the societal cost-effective potential savings from improving lighting energy efficiency range from 50 to 80% of direct lighting energy use in developing and industrialized countries. RP MILLS, E (reprint author), LAWRENCE BERKELEY LAB,CTR BLDG SCI,MS 90-3058,BERKELEY,CA 94720, USA. NR 37 TC 13 Z9 13 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD FEB PY 1993 VL 18 IS 2 BP 75 EP 97 DI 10.1016/0360-5442(93)90092-R PG 23 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA KJ814 UT WOS:A1993KJ81400002 ER PT J AU MILLS, E AF MILLS, E TI EFFICIENT LIGHTING PROGRAMS IN EUROPE - COST-EFFECTIVENESS, CONSUMER RESPONSE, AND MARKET DYNAMICS SO ENERGY LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON ENERGY-EFFICIENT LIGHTING CY 1991 CL STOCKHOLM, SWEDEN AB Since 1987 more than 50 utility-sponsored programs in 11 European countries have offered financial incentives to promote energy-efficient compact fluorescent lamps (CFLs). Roughly 7.4 million households were eligible for the programs and together they acquired about 2.5 million CFLs. Data from 40 of the programs show that the average societal cost of conserved energy is 2.1 cents/kWh, including 0.3 cents/kWh for program administration and marketing, far less than the cost of building and operating new electric power plants. The highest penetration rates and the most cost-effective programs result when utility companies pay a high proportion (or all) of the cost of the efficient lamps. Data on lamp choice, placement, and utilization are presented along with a characterization of participants and non-participants. Survey results show that lamp prices can be a more important influence on consumers' choice of efficient lamps than the price of electricity. Non-economic factors such as environmental protection are as important as economic factors in determining participation. Market barriers, such as product shortages, are discussed along with appropriate remedies. Finally, differences between the European and the U.S. experiences are outlined. RP MILLS, E (reprint author), LAWRENCE BERKELEY LAB,CTR BLDG SCI,MS 90-3058,BERKELEY,CA 94720, USA. NR 34 TC 12 Z9 12 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD FEB PY 1993 VL 18 IS 2 BP 131 EP 144 PG 14 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA KJ814 UT WOS:A1993KJ81400007 ER PT J AU NADEL, SM ATKINSON, BA MCMAHON, JE AF NADEL, SM ATKINSON, BA MCMAHON, JE TI A REVIEW OF UNITED-STATES AND CANADIAN LIGHTING PROGRAMS FOR THE RESIDENTIAL, COMMERCIAL, AND INDUSTRIAL SECTORS SO ENERGY LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON ENERGY-EFFICIENT LIGHTING CY 1991 CL STOCKHOLM, SWEDEN AB We discuss both the technical potential for lighting savings and the achievable potential from existing programs aimed at realizing those savings in both the U.S. and Canada. Approximately 422 TWh or 57% of projected lighting electricity could be saved in the U.S. by 2010 if most cost-effective, commercially available measures were implemented in all applicable buildings. The estimate includes 306 TWh or 66% of projected commercial lighting energy, 60 TWh or 47% of residential lighting energy, and 56 TWh or 38% of industrial lighting energy. We estimate the achievable savings potential from utility programs and regulations (35 to 46%, or 261 to 345 TWh of all U.S. lighting energy). According to this analysis, about 70 to 80% of the technical potential could be saved in 2010 by a combination of regulations and utility programs. C1 LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,BERKELEY,CA 94720. RP NADEL, SM (reprint author), AMER COUNCIL ENERGY EFFICIENT ECON,1001 CONNECTICUT AVE NW,SUITE 801,WASHINGTON,DC 20036, USA. NR 45 TC 9 Z9 9 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD FEB PY 1993 VL 18 IS 2 BP 145 EP 158 DI 10.1016/0360-5442(93)90098-X PG 14 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA KJ814 UT WOS:A1993KJ81400008 ER PT J AU BUSCH, JF DUPONT, P CHIRARATTANANON, S AF BUSCH, JF DUPONT, P CHIRARATTANANON, S TI ENERGY-EFFICIENT LIGHTING IN THAI COMMERCIAL BUILDINGS SO ENERGY LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON ENERGY-EFFICIENT LIGHTING CY 1991 CL STOCKHOLM, SWEDEN AB We explore the opportunities to reduce the electricity required for lighting in prototypical Thai offices, hotels, and shopping centers. Using a whole-building energy analysis approach, we calculate the savings from lighting conservation measures directly, and from associated reductions in cooling load. Ancillary cost savings of air-conditioning energy and capacity comprise a significant 30 to 50% of the total. Lighting technologies considered in this study include electronic ballasts; tri-phosphor, narrow-diameter lamps; specular reflectors; occupancy sensors; lumen maintenance and daylighting controls; and compact fluorescent lamps. From a societal economic perspective, the cost of conserved energy of employing all applicable lighting conservation measures to these buildings is one-quarter or less than the average retail price of electricity for commercial customers, with a payback time of less than one year in hotels and retail buildings and approximately three years in offices. The internal rate of return for installing all lighting measures is 35% in offices, 142% for hotels, and 107% for shopping centers. Several current policy initiatives in Thailand, including a proposed energy standard for commercial buildings, with specific provisions for lighting, and plans by the nation's electric utility to develop two commercial sector conservation programs, should help to spur the adoption of more efficient lighting products. We strongly recommend that the currently high tariffs and taxes (50% and greater) for imported efficient lighting products be reduced. C1 INT INST ENERGY CONSERVAT,BANGKOK 10110,THAILAND. ASIAN INST TECHNOL,BANGKOK 10501,THAILAND. RP BUSCH, JF (reprint author), LAWRENCE BERKELEY LAB,ENERGY ANAL PROGRAM,MS 90-4000,BERKELEY,CA 94720, USA. NR 13 TC 12 Z9 12 U1 2 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD FEB PY 1993 VL 18 IS 2 BP 197 EP 210 DI 10.1016/0360-5442(93)90104-L PG 14 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA KJ814 UT WOS:A1993KJ81400014 ER PT J AU MILLS, E AF MILLS, E TI SPECIAL ISSUE - ENERGY-EFFICIENT LIGHTING - EDITORS INTRODUCTION SO ENERGY LA English DT Editorial Material RP MILLS, E (reprint author), LAWRENCE BERKELEY LAB,CTR BLDG SCI,MS 90-3058,BERKELEY,CA 94720, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD FEB PY 1993 VL 18 IS 2 BP R5 EP R7 DI 10.1016/0360-5442(93)90091-Q PG 3 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA KJ814 UT WOS:A1993KJ81400001 ER PT J AU FRANZBLAU, E POPP, CJ PRESTBO, EW MARLEY, NA GAFFNEY, JS AF FRANZBLAU, E POPP, CJ PRESTBO, EW MARLEY, NA GAFFNEY, JS TI REMOTE MEASUREMENT OF NO2 IN THE BROWN CLOUD OVER ALBUQUERQUE, NEW-MEXICO SO ENVIRONMENTAL MONITORING AND ASSESSMENT LA English DT Article AB Remote measurements of nitrogen dioxide (NO2) were recorded in the 'brown cloud' over Albuquerque, NM, using absorption spectroscopy in the winter of 1987-88 and summer of 1989. The NO2 burdens (optical densities) measured in this mariner were found to be in excess of 100 ppm-m. These long pathlength measurements correspond to total concentrations of approximately 5-10 ppb over the integrated observation pathlengths, which ranged from 10-20 km. These concentrations compare well with single location, independent NO(x) analyses. Using two correlation (absorption) spectrometers simultaneously, it was shown that the NO2 distribution is not uniform over the city and can change on the order of minutes in the boundary layer late in the day, demonstrating the advantages of NO2 optical measurements for assessing the location and extent of urban nitrogen dioxide levels in the boundary layer. C1 ARGONNE NATL LAB,DIV ENVIRONM RES,ARGONNE,IL 60439. NEW MEXICO INST MIN & TECHNOL,DEPT CHEM,SOCORRO,NM 87801. NR 0 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-6369 J9 ENVIRON MONIT ASSESS JI Environ. Monit. Assess. PD FEB PY 1993 VL 24 IS 3 BP 231 EP 242 DI 10.1007/BF00545980 PG 12 WC Environmental Sciences SC Environmental Sciences & Ecology GA KN375 UT WOS:A1993KN37500004 PM 24227381 ER PT J AU SZECSODY, JE STRELLE, GP PAVALKO, WJ AF SZECSODY, JE STRELLE, GP PAVALKO, WJ TI TRANSPORT OF AMINONAPHTHALENE WITH A SITE-LIMITED TRANSFORMATION REACTION SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID LIQUID-CHROMATOGRAPHY; SUBSURFACE MATERIALS; QUINOLINE SORPTION; SURFACE AB It is proposed that aminonaphthalene transport in groundwater systems that contain clay can be altered by two slow reactions on the clay surface: an ion-exchange reaction followed by an irreversible transformation reaction with a limited number of sites. Results of this study support the proposed reaction sequence and provide estimates of the reaction rates. Evidence that the initial ion exchange has occurred includes decreasing sorption at higher pH. Evidence that a transformation has occurred includes a lack of desorption even after 660 h and the presence of a transformation product on the surface. Solute breakthrough m columns shows that both reactions are slow and rates are needed to quantify transport. Reaction rates indicate that the ion-exchange reaction occurs within 0.05-2 h whereas the transformation reaction occurs in 50->1000 h. This reaction sequence is limited by the number of transformation sites, and for the clay-coated alumina particles used, the number of sites is directly correlated to approximately 1/140 of the cation-exchange sites. Because the transformation product is irreversibly sorbed, the number of ion-exchange sites decreases, and the sorption of other solutes is affected. Thus, increased aminonaphthalene sorption was shown to decrease the sorption of another ion exchanger (quinoline), but had no effect on a hydrophobic sorbing compound (naphthalene). RP SZECSODY, JE (reprint author), PACIFIC NW LAB, POB 999, RICHLAND, WA 99352 USA. NR 25 TC 4 Z9 4 U1 0 U2 0 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 FEB PY 1993 VL 27 IS 2 BP 356 EP 365 DI 10.1021/es00039a017 PG 10 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA KK656 UT WOS:A1993KK65600030 ER PT J AU HERBERT, BE BERTSCH, PM NOVAK, JM AF HERBERT, BE BERTSCH, PM NOVAK, JM TI PYRENE SORPTION BY WATER-SOLUBLE ORGANIC-CARBON SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID POLYCYCLIC AROMATIC-HYDROCARBONS; DISSOLVED HUMIC MATERIALS; NATURAL-WATERS; TRANSPORT; BINDING; ACID; NAPHTHALENE; PESTICIDES; HERBICIDES; SUBSTANCES AB Natural dissolved organic matter (DOM) in soil solution has the potential to facilitate the transport of nonionic organic contaminants (NOC). The interactions between pyrene and ultrafiltration fractions of water-soluble organic carbon (WSOC), humic acid, and fulvic acid were quantified using fluorescence-quenching spectroscopy. Pyrene partition coefficients to the smaller WSOC fractions varied between 4.1 X 1.0(3) and 6.8 X 10(3) L kg-1, while partition coefficients for the largest fraction of WSOC, humic acid, and fulvic acid were 1.5 X 10(4), 1.7 X 10(5), and 1.1 X 10(4) L kg-1, respectively. These results demonstrate that the use of the same (c)K(oc) value to describe NOC partitioning to both immobile organic matter and soil solution DOM will overestimate the ability of DOM to facilitate the transport of NOC. Conversely, pyrene partitioning data to the largest WSOC fraction suggest that the presence of colloidal organic matter suspended in the soil solution may have a large influence on NOC transport. C1 UNIV GEORGIA, SAVANNAH RIVER ECOL LAB, DIV BIOGEOCHEM, AIKEN, SC 29802 USA. TEXAS A&M UNIV SYST, DEPT GEOL, COLL STN, TX 77843 USA. RI Herbert, Bruce/K-4744-2013; Herbert, Bruce/L-2170-2015 OI Herbert, Bruce/0000-0002-6736-1148; Herbert, Bruce/0000-0002-6736-1148 NR 32 TC 69 Z9 74 U1 1 U2 8 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 FEB PY 1993 VL 27 IS 2 BP 398 EP 403 DI 10.1021/es00039a021 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA KK656 UT WOS:A1993KK65600034 ER PT J AU RICE, JA LIN, JS AF RICE, JA LIN, JS TI FRACTAL NATURE OF HUMIC MATERIALS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Note C1 OAK RIDGE NATL LAB,DIV SOLID STATE,CTR SMALL ANGLE SCATTERING RES,OAK RIDGE,TN 37831. RP RICE, JA (reprint author), S DAKOTA STATE UNIV,DEPT CHEM,BROOKINGS,SD 57007, USA. NR 7 TC 39 Z9 39 U1 1 U2 3 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 FEB PY 1993 VL 27 IS 2 BP 413 EP 414 DI 10.1021/es00039a024 PG 2 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA KK656 UT WOS:A1993KK65600037 ER PT J AU HEAGLER, MG NEWMAN, MC MULVEY, M DIXON, PM AF HEAGLER, MG NEWMAN, MC MULVEY, M DIXON, PM TI ALLOZYME GENOTYPE IN MOSQUITOFISH, GAMBUSIA-HOLBROOKI, DURING MERCURY EXPOSURE - TEMPORAL STABILITY, CONCENTRATION EFFECTS AND FIELD VERIFICATION SO ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY LA English DT Article DE MOSQUITOFISH; GAMBUSIA-HOLBROOKI; MERCURY TOXICITY; GENETICS; TOLERANCE ID BIOCHEMICAL GENETICS; INORGANIC MERCURY; ALLELE FREQUENCIES; MARINE GASTROPODS; AFFINIS BAIRD; POPULATIONS; TIME; SELECTION; DEATH; SYSTEMATICS AB Genotype frequencies at nine enzyme loci were examined in a population of mosquitofish, Gambusia holbrooki, during acute inorganic mercury exposure at three concentrations. Genotype at one locus, glucose phosphate isomerase-2 (Gpi-2), was correlated with time to death (TTD) at the low (0.83 mg/L) mercury concentration, but genotypes at none of the nine loci were related to TTD at the medium (1.07 mg/L) or the high (1.13 mg/L) mercury concentration. A survey of mosquitofish from a mercury-contaminated canal was undertaken to determine if the results of laboratory exposures could be used to predict accurately the genetic profile of mercury-contaminated field populations. Mosquitofish collected from the contaminated canal had a significantly lower frequency of the Gpi-2(38) allele than mosquitofish collected from the adjacent noncontaminated river. The Gpi-2 allozymes may be useful as an indicator of pollutant stress if used in conjunction with a thorough understanding of the structure and history of the population. C1 UNIV GEORGIA,SAVANNAH RIVER ECOL LAB,AIKEN,SC 29802. RUTGERS STATE UNIV,NEW BRUNSWICK,NJ 08903. NR 25 TC 37 Z9 38 U1 1 U2 6 PU SETAC PRESS PI PENSACOLA PA 1010 NORTH 12TH AVE, PENSACOLA, FL 32501-3370 SN 0730-7268 J9 ENVIRON TOXICOL CHEM JI Environ. Toxicol. Chem. PD FEB PY 1993 VL 12 IS 2 BP 385 EP 395 DI 10.1897/1552-8618(1993)12[385:AGIMGH]2.0.CO;2 PG 11 WC Environmental Sciences; Toxicology SC Environmental Sciences & Ecology; Toxicology GA KK070 UT WOS:A1993KK07000018 ER PT J AU WARNERBARTNICKI, AL MURAO, S COLLART, FR HUBERMAN, E AF WARNERBARTNICKI, AL MURAO, S COLLART, FR HUBERMAN, E TI REGULATED EXPRESSION OF THE MRP8 AND MRP14 GENES IN HUMAN PROMYELOCYTIC LEUKEMIC HL-60 CELLS TREATED WITH THE DIFFERENTIATION-INDUCING AGENTS MYCOPHENOLIC-ACID AND 1-ALPHA,25-DIHYDROXYVITAMIN-D3 SO EXPERIMENTAL CELL RESEARCH LA English DT Article ID CALCIUM-BINDING PROTEINS; CYSTIC-FIBROSIS ANTIGEN; LEUKOCYTE L1 PROTEIN; CASEIN KINASE-II; RIBONUCLEIC-ACID; COMPLEX; MATURATION; INHIBITOR; CLONING; GROWTH C1 ARGONNE NATL LAB,DIV BIOL & MED RES,9700 S CASS AVE,ARGONNE,IL 60439. NR 29 TC 10 Z9 10 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0014-4827 J9 EXP CELL RES JI Exp. Cell Res. PD FEB PY 1993 VL 204 IS 2 BP 241 EP 246 DI 10.1006/excr.1993.1030 PG 6 WC Oncology; Cell Biology SC Oncology; Cell Biology GA KN867 UT WOS:A1993KN86700009 PM 8440321 ER PT J AU CRONKITE, EP BURLINGTON, H SHIMOSAKA, A BULLIS, JE PAPPAS, N AF CRONKITE, EP BURLINGTON, H SHIMOSAKA, A BULLIS, JE PAPPAS, N TI ANEMIA INDUCED IN SPLENECTOMIZED MICE BY ADMINISTRATION OF RHG-CSF SO EXPERIMENTAL HEMATOLOGY LA English DT Article DE G-CSF; ANEMIA; SPLENECTOMY ID COLONY-STIMULATING FACTOR; TRANSPLANTATION; HEMATOPOIESIS; MARROW; INVIVO; TUMOR; CELLS AB Normal and splenectomized mice (SPLXM) were given rhG-CSF for 10 to 128 days and serial observations were made on blood counts for 128 days. After 10 days, mice were killed for histologic studies. All treatment schedules produced, in addition to elevated white blood counts, a macrocytic anemia which only partially responded to large doses of Epo. Stopping rhG-CSF treatment for 2 days resulted in the return of granulocytes, lymphocytes, monocytes, platelets and polychromatophilic erythrocytes to near normal levels, indicating a need for the continued presence of rhG-CSF to maintain peripheral blood increases. Treatment of normal and SPLXM with rhG-CSF induced marked granulocytic hyperplasia of the bone marrow with expansion of the granulocytic marrow into the adjoining muscle as in acute myelocytic leukemia. The hyperplasia is greater in the SPLXM than in the normal mouse where splenic hyperplasia occurs in all cell lines. The rhG-CSF also results in expansion of granulopoiesis into the normally fatty tail bone marrow in SPLXM. The rhG-CSF treatment produced marked increases in the assayable numbers of GM-CFU, G-CFU and M-CFU. The significance and mechanisms of induction of these changes are not clear. It is speculated that treatment with rhG-CSF has multicellular effects, suggesting that it initiates a cascade of molecular reactions that cause the effects observed. C1 MT SINAI SCH MED,NEW YORK,NY. KIRIN BREWERY CO LTD,SHIBUYA KU,TOKYO,TOKYO,JAPAN. RP CRONKITE, EP (reprint author), BROOKHAVEN NATL LAB,DEPT MED,BLDG 490,UPTON,NY 11973, USA. NR 26 TC 12 Z9 12 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD FEB PY 1993 VL 21 IS 2 BP 319 EP 325 PG 7 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA MW607 UT WOS:A1993MW60700023 PM 7678815 ER PT J AU LAMBERT, SM SOANE, DS PRAUSNITZ, JM AF LAMBERT, SM SOANE, DS PRAUSNITZ, JM TI LIQUID-LIQUID EQUILIBRIA IN BINARY-SYSTEMS - MONTE-CARLO SIMULATIONS FOR CALCULATING THE EFFECT OF NONRANDOM MIXING SO FLUID PHASE EQUILIBRIA LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON FLUID PROPERTIES AND PHASE EQUILIBRIA FOR CHEMICAL PROCESS DESIGN 1992 CY JUL 19-24, 1992 CL CORTINA AMPEZZO, ITALY SP EUROPEAN ECON COMMUNITY, UNIV TRIESTE, CNR, NATL SCI FDN, ALLIED SIGNAL, CHIM FRIULI, CP ENICHEM POLIMERI, DSM, DUPONT CO, ENIRICERCHE DE LATTICE MODEL; MONTE-CARLO SIMULATION; LIQUID-LIQUID EQUILIBRIA; BINARY MIXTURES; POLYMER SOLUTION ID POLYMER-SOLUTIONS AB Monte-Carlo simulations of a lattice model for incompressible monomer/r-mer mixtures are used to obtain accurate results for the configurational energy of mixing. Based on simulation results, the energy of mixing is correlated as a function of temperature and composition using an empirical expression. The configurational Helmholtz energy is obtained upon using the Gibbs-Helmholtz equation with Guggenheim's athermal entropy of mixing as boundary condition. Since Monte-Carlo simulations give essentially exact results for the lattice model, the effects of nonrandom mixing on the configurational thermodynamic properties of a binary mixture can be determined. The expression generated here produces coexistence curves that are more accurate than those from other models, especially near the critical region. C1 LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RP LAMBERT, SM (reprint author), LAWRENCE BERKELEY LAB,DEPT CHEM ENGN,BERKELEY,CA 94720, USA. NR 20 TC 36 Z9 37 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD FEB PY 1993 VL 83 BP 59 EP 68 DI 10.1016/0378-3812(93)87007-N PG 10 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA KY815 UT WOS:A1993KY81500007 ER PT J AU HU, Y YING, XG WU, DT PRAUSNITZ, JM AF HU, Y YING, XG WU, DT PRAUSNITZ, JM TI MOLECULAR THERMODYNAMICS OF POLYMER-SOLUTIONS SO FLUID PHASE EQUILIBRIA LA English DT Article DE THEORY; EQUATION OF STATE; LIQUID-LIQUID EQUILIBRIA; POLYMERS ID CRITICAL SOLUTION TEMPERATURES; PHASE-EQUILIBRIA; LINEAR-POLYETHYLENE; LATTICE MODEL; SYSTEMS; SIMULATIONS; SOLVENT AB The previously revised Freed lattice model is used to replace the Flory-Huggins mean-field theory for binary polymer/solvent mixtures. Liquid-liquid binodals calculated for model systems are in good agreement with those from computer simulation and those from Freed's rigorous lattice cluster theory. A double lattice model is used to account for oriented interactions such as hydrogen bonding. To account for free-volume effects, an essentially empirical, two-step process is adopted. First, pure components are mixed to form a close-packed polymer solution. Then, holes are introduced to mix with the close-packed solution which is considered to be a pseudo-pure substance. The revised Freed model is applied for both steps. A size parameter c(r) accounts for the composition dependence of effective chain lengths. Two binary energy parameters are used: epsilon is the conventional interchange energy of a nearest-neighbor i-j segment-segment pair, and r corrects the quadratic rule for mixing the two components to form a pseudo-pure substance. Pure-component parameters, r(i)o and epsilon(ii), are obtained by fitting experimental pure-component vapor pressure and pvT data. A few examples indicate that the semi-empirical model can describe satisfactorily a variety of liquid-liquid equilibria including UCST, LCST, miscibility-loop and hour-glass-shaped phase diagrams, as well as the pressure dependence and the solar-mass dependence of liquid-liquid binodals. C1 LAWRENCE BERKELEY LAB, DEPT CHEM ENGN, BERKELEY, CA 94720 USA. LAWRENCE BERKELEY LAB, DIV CHEM SCI, BERKELEY, CA 94720 USA. DUPONT CO, MARSHALL LAB, PHILADELPHIA, PA 19146 USA. RP HU, Y (reprint author), E CHINA UNIV CHEM TECHNOL, DEPT CHEM, SHANGHAI 200237, PEOPLES R CHINA. NR 36 TC 40 Z9 49 U1 3 U2 10 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 EI 1879-0224 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD FEB PY 1993 VL 83 BP 289 EP 300 DI 10.1016/0378-3812(93)87032-V PG 12 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA KY815 UT WOS:A1993KY81500032 ER PT J AU DEPABLO, JJ LASO, M SUTER, UW COCHRAN, HD AF DEPABLO, JJ LASO, M SUTER, UW COCHRAN, HD TI CONTINUUM CONFIGURATIONAL BIAS MONTE-CARLO STUDIES OF ALKANES AND POLYETHYLENE SO FLUID PHASE EQUILIBRIA LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON FLUID PROPERTIES AND PHASE EQUILIBRIA FOR CHEMICAL PROCESS DESIGN 1992 CY JUL 19-24, 1992 CL CORTINA AMPEZZO, ITALY SP EUROPEAN ECON COMMUNITY, UNIV TRIESTE, CNR, NATL SCI FDN, ALLIED SIGNAL, CHIM FRIULI, CP ENICHEM POLIMERI, DSM, DUPONT CO, ENIRICERCHE ID SIMULATION; DILUTE AB A novel class of Monte-Carlo simulation methods has recently been developed for the study of dense polymeric systems. Such methods allow the calculation of chemical potential and solubilities in macromolecular systems. In this work, results are presented for solubilities of long alkanes in polyethylene and for dilute solutions of long alkanes in near-critical solvents. C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. RP DEPABLO, JJ (reprint author), SWISS FED INST TECHNOL,EIDGENOSS TECH HSCH,INST POLYMERE,CH-8092 ZURICH,SWITZERLAND. RI Suter, Ulrich/H-8900-2013; Laso, Manuel/H-2734-2015 OI Suter, Ulrich/0000-0001-7467-7346; NR 17 TC 29 Z9 29 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3812 J9 FLUID PHASE EQUILIBR JI Fluid Phase Equilib. PD FEB PY 1993 VL 83 BP 323 EP 331 DI 10.1016/0378-3812(93)87035-Y PG 9 WC Thermodynamics; Chemistry, Physical; Engineering, Chemical SC Thermodynamics; Chemistry; Engineering GA KY815 UT WOS:A1993KY81500035 ER PT J AU SOLEM, JC BIEDENHARN, LC AF SOLEM, JC BIEDENHARN, LC TI UNDERSTANDING GEOMETRICAL PHASES IN QUANTUM-MECHANICS - AN ELEMENTARY EXAMPLE SO FOUNDATIONS OF PHYSICS LA English DT Article AB We discuss an exact solution to the simplest nontrivial example of a geometrical phase in quantum mechanics. By means of this example: (1) we elucidate the fundamental distinction between rays and vectors in describing quantum mechanical states; (2) we show that superposition of quantal states is invalid; only decomposition is allowed-which is adequate for the measurement process. Our example also shows that the origin of singularities in the analog vector potential is to be found in the unavoidable breaking of projective symmetry caused by using the Schrodinger equation. C1 UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712. RP SOLEM, JC (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. NR 10 TC 5 Z9 6 U1 1 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0015-9018 J9 FOUND PHYS JI Found. Phys. PD FEB PY 1993 VL 23 IS 2 BP 185 EP 195 DI 10.1007/BF01883623 PG 11 WC Physics, Multidisciplinary SC Physics GA KX050 UT WOS:A1993KX05000003 ER PT J AU WALLMAN, PH CARLSSON, RCJ AF WALLMAN, PH CARLSSON, RCJ TI NO(X) REDUCTION BY AMMONIA - THE EFFECTS OF PRESSURE AND MINERAL SURFACES SO FUEL LA English DT Article DE NO(X) REDUCTION; AMMONIA REDUCTANT; NITRIC OXIDE ID NH3; NO; MECHANISM; CATALYSTS; OXYGEN; OXIDE AB Experiments were conducted in a packed-bed. flow-through reactor with the objective of studying the effect of mineral surfaces on the reaction between nitric oxide and ammonia. and between nitric oxide and urea. The bed materials studied were quartz as an inert reference material. a non-porous fire clay as a weakly catalytic material, and a sample of bed material from a pressurized fluidized-bed boiler. Total pressure was a variable in the study. Experiments at different temperatures and with different ps mixtures established the main features of the mechanism of NO(x) reduction over mineral surfaces. The fire clay, and particularly the bed ash, showed NO(x) reduction at much lower temperature than the homogeneous quartz case did. Further, the heterogeneous case showed a strong oxygen dependence pointing to NO2,ads as an oxidized surface intermediate for the heterogeneous reduction. Ammonia oxidation to NO was a troublesome competing reaction at low pressure but not at high pressure. Nitrous oxide formation was low in the catalytic bed cases, but residual ammonia was a significant problem for low-temperature practical applications of the obtained results. C1 CHALMERS UNIV TECHNOL,DEPT ENERGY CONVERS,S-41296 GOTHENBURG,SWEDEN. RP WALLMAN, PH (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 15 TC 8 Z9 9 U1 0 U2 1 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 FEB PY 1993 VL 72 IS 2 BP 187 EP 192 DI 10.1016/0016-2361(93)90396-J PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA KH973 UT WOS:A1993KH97300007 ER PT J AU BOURCIER, WL KNAUSS, KG JACKSON, KJ AF BOURCIER, WL KNAUSS, KG JACKSON, KJ TI ALUMINUM HYDROLYSIS CONSTANTS TO 250-DEGREES-C FROM BOEHMITE SOLUBILITY MEASUREMENTS SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID FERROUS ACETATE COMPLEXES; MOLAL FORMATION-CONSTANTS; AQUEOUS-SOLUTION; THERMODYNAMIC PROPERTIES; POTENTIOMETRIC DETERMINATION; HYDROXO COMPLEXES; HIGH-TEMPERATURES; ACETIC-ACID; EQUILIBRIUM; IONS AB Boehmite solubilities were measured at 150, 200, and 250-degrees-C at pH values from 1 to 10 at 100 bars total pressure and used to determine the stability constants for the mononuclear aluminum hydroxide complexes (Al(OH)2+, Al(OH)2+, Al(OH)30, Al(OH)4-), and the solubility product of boehmite. Buffer solutions of HCl-KCl, acetic acid-sodium acetate, sodium bicarbonate-carbonic acid, and boric acid-potassium hydroxide were used to control pH. Our solubility data are in good agreement with boehmite solubility measurements in perchloric acid and sodium hydroxide solutions reported by KU-YUNKO et al. (1983). The stability constants for the aluminum hydroxide species were determined from the solubility data using a Ridge regression technique. The results indicate that aluminum ion hydrolysis becomes stronger at higher temperatures, and the stability field of the neutral complex Al(OH)30 becomes larger. The results are used to provide a set of equilibrium constants for aluminum hydroxide complex formation and boehmite hydrolysis from 0-300-degrees-C. RP BOURCIER, WL (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI knauss, kevin/K-2827-2012; jackson, Kenneth/E-2236-2013 OI jackson, Kenneth/0000-0003-4231-3809 NR 58 TC 56 Z9 56 U1 0 U2 10 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD FEB PY 1993 VL 57 IS 4 BP 747 EP 762 DI 10.1016/0016-7037(93)90166-T PG 16 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KN412 UT WOS:A1993KN41200003 ER PT J AU CASEY, WH HOCHELLA, MF WESTRICH, HR AF CASEY, WH HOCHELLA, MF WESTRICH, HR TI THE SURFACE-CHEMISTRY OF MANGANIFEROUS SILICATE MINERALS AS INFERRED FROM EXPERIMENTS ON TEPHROITE (MN2SIO4) SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID COORDINATION CHEMISTRY; DISSOLUTION KINETICS; SOLUTION INTERFACE; ORGANIC-ACIDS; X-RAY; OXIDE; OLIVINE; 25-DEGREES-C; MECHANISM; ELECTRON AB The dissolution rate of tephroite in oxygen-free solutions decreases with increased pH over the interval 2 less-than-or-equal-to pH less-than-or-equal-to 8 and with decreased temperature over the range 25-45-degrees-C. The pH-dependence is similar to other orthosilicate minerals at 25-degrees-C and presumably relates to variations in the concentration of adsorbed hydrogen ions. The rate order with respect to solution pH increases with temperature and the experimental activation parameters vary strikingly with solution pH. These variations are interpreted to result from contributions of enthalpy to the experimental activation energy (E(exp)) from proton adsorption and from coulombic interactions among charged sites on the mineral surface. The dependence of dissolution rate on the logarithm of solution pH is only approximately linear with pH; the dependence is sensitive to changes in temperature via the conditional equilibrium constant that describes the concentrations of charge sites on the mineral surface. X-ray photoelectron spectroscopic (XPS) measurements of the reacted mineral surfaces indicate that Mn remains in the divalent valence state at all conditions. The near-surface region of the mineral,after acid dissolution has a Mn/Si ratio which is lower than the unreacted material while the opposite result is observed after reaction at basic-pH conditions. C1 STANFORD UNIV,STANFORD,CA 94305. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP CASEY, WH (reprint author), UNIV CALIF DAVIS,DAVIS,CA 95616, USA. NR 39 TC 40 Z9 40 U1 1 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD FEB PY 1993 VL 57 IS 4 BP 785 EP 793 DI 10.1016/0016-7037(93)90168-V PG 9 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KN412 UT WOS:A1993KN41200005 ER PT J AU UNSWORTH, MJ TRAVIS, BJ CHAVE, AD AF UNSWORTH, MJ TRAVIS, BJ CHAVE, AD TI ELECTROMAGNETIC INDUCTION BY A FINITE ELECTRIC-DIPOLE SOURCE OVER A 2-D EARTH SO GEOPHYSICS LA English DT Article ID ELEMENT METHOD; RESISTIVITY; QUADRATURE AB A numerical solution for the frequency domain electromagnetic response of a two-dimensional (2-D) conductivity structure to excitation by a three-dimensional (3-D) current source has been developed. The fields are Fourier transformed in the invariant conductivity direction and then expressed in a variational form. At each of a set of discrete spatial wavenumbers a finite-element method is used to obtain a solution for the secondary electromagnetic fields. The finite element uses exponential elements to efficiently model the fields in the far-field. In combination with an iterative solution for the along-strike electromagnetic fields, this produces a considerable reduction in computation costs. The numerical solutions for a horizontal electric dipole are computed and shown to agree with closed form expressions and to converge with respect to the parameterization. Finally some simple examples of the electromagnetic fields produced by horizontal electric dipole sources at both the seafloor and air-earth interface are presented to illustrate the usefulness of the code. C1 UNIV CAMBRIDGE,DEPT EARTH SCI,BULLARD LABS,CAMBRIDGE,ENGLAND. LOS ALAMOS NATL LAB,DIV EARTH & ENVIRONM SCI,LOS ALAMOS,NM 87545. WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. RI Unsworth, Martyn/A-6395-2012 NR 19 TC 58 Z9 75 U1 0 U2 3 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD FEB PY 1993 VL 58 IS 2 BP 198 EP 214 DI 10.1190/1.1443406 PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KM056 UT WOS:A1993KM05600001 ER PT J AU REED, MJ AF REED, MJ TI GEOTHERMAL-ENERGY SO GEOTIMES LA English DT Article RP REED, MJ (reprint author), US DOE,DIV GEOTHERMAL,WASHINGTON,DC 20585, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER GEOLOGICAL INST PI ALEXANDRIA PA 4220 KING ST, ALEXANDRIA, VA 22302-1507 SN 0016-8556 J9 GEOTIMES JI Geotimes PD FEB PY 1993 VL 38 IS 2 BP 12 EP 13 PG 2 WC Geosciences, Multidisciplinary SC Geology GA KL388 UT WOS:A1993KL38800007 ER PT J AU EBBERS, CA DELOACH, LD WEBB, M EIMERL, D VELSKO, SP KESZLER, DA AF EBBERS, CA DELOACH, LD WEBB, M EIMERL, D VELSKO, SP KESZLER, DA TI NONLINEAR OPTICAL-PROPERTIES OF K2LA(NO3)5.2H2O AND K2CE(NO3)5.2H2O SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID L-ARGININE PHOSPHATE; CRYSTAL; PHASE; GENERATION; LIB3O5 AB Potassium lanthanum nitrate dihydrate (KLN) and its cerium analog are water soluble nonlinear crystals with coefficients approximately 3 x larger than KDP. KLN is noncritically phase-matched at room temperature for Type I frequency doubling of 1.064 mum light. KLN and KCN are also nearly noncritical for Type II frequency doubling of 0.90-0.95 mum light. C1 OREGON STATE UNIV,DEPT CHEM,CORVALLIS,OR 97331. RP EBBERS, CA (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 27 TC 21 Z9 21 U1 2 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD FEB PY 1993 VL 29 IS 2 BP 497 EP 507 DI 10.1109/3.199304 PG 11 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA KQ480 UT WOS:A1993KQ48000023 ER PT J AU KANE, DJ TREBINO, R AF KANE, DJ TREBINO, R TI CHARACTERIZATION OF ARBITRARY FEMTOSECOND PULSES USING FREQUENCY-RESOLVED OPTICAL GATING SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ULTRASHORT LASER-PULSES; PHASE RETRIEVAL; CHIRP MEASUREMENT; ABSORPTION; AMPLITUDE; RECONSTRUCTION; GENERATION; DOMAIN AB We introduce a new technique, which we call frequency-resolved optical gating (FROG), for characterizing and displaying arbitrary femtosecond pulses. The method is simple, general, broad-band, and does not require a reference pulse. Using virtually any instantaneous nonlinear-optical effect, FROG involves measuring the spectrum of the signal pulse as a function of the delay between two input pulses. The resulting trace of intensity versus frequency and delay is related to the pulse's spectrogram, a visually intuitive transform containing both time and frequency information. We prove, using phase retrieval concepts, that the FROG trace yields the full intensity I(t) and phase phi(t) of an arbitrary ultrashort pulse with no physically significant ambiguities. We argue, in analogy with acoustics problems, that the FROG trace is in many ways as useful a representation of the pulse as the field itself. FROG appears to have temporal resolution limited only by the response of the nonlinear medium. We demonstrate the method using self-diffraction via the electronic Kerr effect in BK-7 glass and few muJ, 620 nm, linearly chirped, approximately 200 fs pulses. C1 SANDIA NATL LABS,COMBUST RES FACIL,LIVERMORE,CA 94551. RP KANE, DJ (reprint author), SW SCI INC,SANTA FE,NM 87501, USA. NR 42 TC 445 Z9 463 U1 11 U2 96 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD FEB PY 1993 VL 29 IS 2 BP 571 EP 579 DI 10.1109/3.199311 PG 9 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA KQ480 UT WOS:A1993KQ48000030 ER PT J AU CHENG, JL ZHOU, P SUN, SZ HERSEE, S MYERS, DR ZOLPER, J VAWTER, GA AF CHENG, JL ZHOU, P SUN, SZ HERSEE, S MYERS, DR ZOLPER, J VAWTER, GA TI SURFACE-EMITTING LASER-BASED SMART PIXELS FOR 2-DIMENSIONAL OPTICAL LOGIC AND RECONFIGURABLE OPTICAL INTERCONNECTIONS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID OPTOELECTRONIC SWITCHING DEVICE; ELECTROOPTIC EFFECT DEVICES; LOW THRESHOLD; LOW-VOLTAGE; HIGH-POWER; INTEGRATION; MODULATOR; EPITAXY; DIODES; ARRAY AB A monolithic smart pixel technology based on the integration of two-dimensional arrays of cascadable optical switches, optical logic gates, and optical switching nodes consisting of vertical-cavity surface-emitting lasers and heterojunction phototransistors or photothyristors is described. Different combinations of these components are shown to perform optical switching, logic, routing, memory, and regeneration. Latching, nonlatching, and bistable switches with high optical gain and contrast are demonstrated, along with all the simple single-stage Boolean optical logic functions. We also describe a novel 2 x 2 optical bypass-exchange node, and a reconfigurable, multistage, two-dimensional optical switching network architecture. C1 SANDIA LABS,ALBUQUERQUE,NM 87156. RP CHENG, JL (reprint author), UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131, USA. NR 40 TC 37 Z9 39 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD FEB PY 1993 VL 29 IS 2 BP 741 EP 756 DI 10.1109/3.199326 PG 16 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA KQ480 UT WOS:A1993KQ48000045 ER PT J AU RAY, SL AF RAY, SL TI NUMERICAL DISPERSION AND STABILITY CHARACTERISTICS OF TIME-DOMAIN METHODS ON NONORTHOGONAL MESHES SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note ID MAXWELL EQUATIONS AB The familiar finite-difference, time-domain method for discretizing Maxwell's curl equations on orthogonal grids has been extended to nonorthogonal grids by a number of researchers. While it is difficult to determine the dispersion and stability characteristics of these methods when applied on arbitrary grids, analysis of the idealized but representative case of a uniform skewed mesh proves to be quite tractable in 2-D. This analysis demonstrates that numerical dispersion errors are small for well-resolved spatial wavelengths and that these methods converge to the continuous-space solution in the limit as the cell and time step sizes vanish. Grid anisotropy (variations in wave propagation speed as a function of the propagation angle relative to the mesh coordinates) increases as the mesh is skewed. In spite of this, there exist some angles where waves propagate through the skewed mesh with virtually no dispersion. This analysis also provides a stability limit for the time step size in terms of geometrical mesh quantities. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. NR 7 TC 14 Z9 14 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD FEB PY 1993 VL 41 IS 2 BP 233 EP 235 DI 10.1109/8.214617 PG 3 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LE052 UT WOS:A1993LE05200016 ER PT J AU GOVER, JE AF GOVER, JE TI STRENGTHENING THE COMPETITIVENESS OF UNITED-STATES MICROELECTRONICS SO IEEE TRANSACTIONS ON ENGINEERING MANAGEMENT LA English DT Article AB U.S. competitiveness problems have not been due to a lack of research; rather, they stem from difficulties in sustaining competitiveness when commercialization is dominated by product and process improvements. Partial shifting of R & D investment by the private sector from innovative new products to improvement of manufacturing processes will help correct these deficiencies, but it may not be sufficient to regain competitiveness in areas where U.S. industry has fallen behind foreign competition. National programs are believed to be required where catch-up situations prevail. In order for the United States to catch up with Japan in all areas of microelectronics, it is recommended that industry-wide, catch-up consortia be established or continued in the six areas where the United States is rapidly becoming noncompetitive. In addition, it is recommended that the United States establish programs managed by consortia for microelectronics research integration, application, simulation, and modeling. These consortia would be managed by an industry-led Microelectronics Alliance (perhaps SEMA-TECH) whose establishment would be coordinated by a federal agency designated by Congress. Annual funding of $1 000 000 000 for this consortia complex would increase the U.S. microelectronics R & D investment by 25% and within seven years restore the competitiveness of the U.S. microelectronics industry in all areas. Where appropriate, consortia work would be delegated to U.S. universities and U.S. government-owned laboratories with government bearing the full cost of consortia management. Funding of consortia work at industrial facilities would be negotiated with the government offering increased R & D tax credits, accelerated equipment depreciation schedules, and partial R & D funding to consortia members. These consortia would be operated according to the success principles determined from Japan and U.S. consortia experiences. C1 OFF SENATOR WILLIAM ROTH JR,WASHINGTON,DC. RP GOVER, JE (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 45 TC 8 Z9 8 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9391 J9 IEEE T ENG MANAGE JI IEEE Trans. Eng. Manage. PD FEB PY 1993 VL 40 IS 1 BP 3 EP 13 DI 10.1109/17.206644 PG 11 WC Business; Engineering, Industrial; Management SC Business & Economics; Engineering GA KT014 UT WOS:A1993KT01400001 ER PT J AU SLOAN, GR AF SLOAN, GR TI THE MODELING, ANALYSIS, AND DESIGN OF FILTER-BASED PARAMETRIC FREQUENCY-DIVIDERS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB This paper documents a technique for the design of filter-based parametric frequency dividers. The technique combines basic divider analysis with modern nonlinear simulation techniques. In essence, the procedure allows the completion of a successful design that is based on computer simulations, but requires little or no nonlinear optimization. Specifically, the paper investigates divider modeling, threshold, and efficiency, and presents a straight-forward design strategy. RP SLOAN, GR (reprint author), SANDIA NATL LABS,DEPT RADAR,ALBUQUERQUE,NM 87185, USA. NR 13 TC 12 Z9 12 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD FEB PY 1993 VL 41 IS 2 BP 224 EP 228 DI 10.1109/22.216460 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA LH109 UT WOS:A1993LH10900006 ER PT J AU KALLURI, DK GOTETI, VR SESSLER, AM AF KALLURI, DK GOTETI, VR SESSLER, AM TI WKB SOLUTION FOR WAVE-PROPAGATION IN A TIME-VARYING MAGNETOPLASMA MEDIUM - LONGITUDINAL PROPAGATION SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID PLASMA; RADIATION AB The interaction of a right circularly polarized electromagnetic wave of frequency omega0 with a switched-on-time-varying plasma medium, in the presence of a static magnetic field, is considered. Longitudinal propagation is assumed and ion motion is neglected. The electron density is assumed to vary slowly with time, and the solution is obtained through a WKB approximation. The main effect of switching the time-varying medium is the splitting of the original (incident) wave of frequency omega0 into three new waves with time-varying frequencies. An exponentially increasing electron density profile is considered to illustrate the solution. The distinguishing feature of the presence of the static magnetic field is the creation of the third wave. The initial value of the instantaneous frequency omega3 of this wave is equal to the gyrofrequency omega(b), and the final value depends on omega(b), omega0, and the final value of the plasma frequency. Omega3 decreases with time for the profile under consideration. C1 BIRLA INST TECHNOL,RANCHI 835215,BIHAR,INDIA. TUSKEGEE UNIV,FAC ELECT ENGN,SCH ENGN & ARCHITECTURE,TUSKEGEE,AL 36088. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KALLURI, DK (reprint author), UNIV MASSACHUSETTS,DEPT ELECT ENGN,LOWELL,MA 01854, USA. NR 13 TC 38 Z9 41 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 1993 VL 21 IS 1 BP 70 EP 76 DI 10.1109/27.221103 PG 7 WC Physics, Fluids & Plasmas SC Physics GA LD709 UT WOS:A1993LD70900008 ER PT J AU CRANE, JK PERRY, MD STRICKLAND, D HERMAN, S FALCONE, RW AF CRANE, JK PERRY, MD STRICKLAND, D HERMAN, S FALCONE, RW TI COHERENT AND INCOHERENT XUV EMISSION IN HELIUM AND NEON, LASER-DRIVEN PLASMAS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID FIELD-INDUCED IONIZATION; HARMONIC-GENERATION; RARE-GASES; RECOMBINATION AB We present results of measurements of high-order harmonic generation and XUV spontaneous emission in helium and neon plasmas excited by a short pulse laser at intensities between 10(14) and 5 x 10(17)W/cm2. We compare the observed behavior of the harmonics with recent single atom calculations in helium. We observe a wavelength dependence to the efficiency of harmonic generation that has not been previously reported. We observe line emission from excited state transitions in Ne7+ for the first time in a short pulse laser-driven plasma. In particular, we see strong emission and a rapid recombination rate for the 9.8 nm (3d-2p) transition that is a possible candidate for a recombination-pumped X-ray laser. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP CRANE, JK (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. RI Strickland, Donna/J-3163-2012 OI Strickland, Donna/0000-0003-2925-5413 NR 21 TC 9 Z9 9 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 1993 VL 21 IS 1 BP 82 EP 89 DI 10.1109/27.221105 PG 8 WC Physics, Fluids & Plasmas SC Physics GA LD709 UT WOS:A1993LD70900010 ER PT J AU RAX, JM FISCH, NJ AF RAX, JM FISCH, NJ TI PHASE-MATCHED 3RD HARMONIC-GENERATION IN A PLASMA SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID INTENSE LASER-PULSES AB Relativistic third harmonic generation in a plasma is investigated. The growth of a third harmonic wave is limited by the difference between the phase velocity of the pump and driven waves. This phase velocity mismatch results in a third harmonic amplitude saturation and oscillation. In order to overcome this saturation, we describe a phase-matching scheme based on a resonant density modulation. The limitations of this scheme are analyzed. RP RAX, JM (reprint author), PRINCETON UNIV,PLASMA PHYS LAB,PRINCETON,NJ 08544, USA. NR 18 TC 38 Z9 38 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 1993 VL 21 IS 1 BP 105 EP 109 DI 10.1109/27.221108 PG 5 WC Physics, Fluids & Plasmas SC Physics GA LD709 UT WOS:A1993LD70900013 ER PT J AU MORI, WB DECKER, CD LEEMANS, WP AF MORI, WB DECKER, CD LEEMANS, WP TI RELATIVISTIC HARMONIC CONTENT OF NONLINEAR ELECTROMAGNETIC-WAVES IN UNDERDENSE PLASMAS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID LASER; ACCELERATOR AB The relativistic harmonic content of large amplitude electromagnetic waves propagating in underdense plasmas is investigated. The steady state harmonic content of nonlinear linearly polarized waves is calculated for both the very underdense (w(p)/w(o)) much less than 1 and critical density (w(p)/w(o)) congruent-to 1 limits. For weak nonlinearities, eE(o)/mcomega(o) < 1, the nonlinear source term for the third harmonic is derived for arbitrary w(p)/w(o). Arguments are given for extending these results for arbitrary wave amplitudes. We also show that the use of the variable x - ct and the quasi-static approximation leads to errors in both magnitude and sign when calculating the third harmonic. In the absence of damping or density gradients the third harmonic's amplitude is found to oscillate between zero and twice the steady state value. Preliminary PIC simulation results are presented. The simulation results are in basic agreement with the uniform plasma predictions for the third harmonic amplitude. However, the higher harmonics are orders of magnitude larger than expected and the presence of density ramps significantly modifies the results. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MORI, WB (reprint author), UNIV CALIF LOS ANGELES,DEPT ELECT ENGN,LOS ANGELES,CA 90024, USA. NR 30 TC 67 Z9 67 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 1993 VL 21 IS 1 BP 110 EP 119 DI 10.1109/27.221109 PG 10 WC Physics, Fluids & Plasmas SC Physics GA LD709 UT WOS:A1993LD70900014 ER PT J AU WILKS, SC KRUER, WL MORI, WB AF WILKS, SC KRUER, WL MORI, WB TI ODD HARMONIC-GENERATION OF ULTRA-INTENSE LASER-PULSES REFLECTED FROM AN OVERDENSE PLASMA SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID GLASS-LASER; MULTITERAWATT AB A method of generating odd harmonics from an intense laser incident upon a sharp vacuum-overdense plasma interface is presented. One and two-dimensional simulations are used to investigate the interaction of ultra-intense laser pulses with a sharp vacuum-plasma interface. With an intensity greater than 10(18) W/cm2, these pulses have a pressure greater than 103 Mbars creating large density oscillations and relativistic electron velocities at the surface. This results in efficient odd harmonic generation. We present a physical model for this harmonic generation mechanism, and some scaling of the power in the third harmonic. This is compared with relativistic particle-in-cell simulations that include mobile and immobile ions, as well as a variety of upper shelf densities. A discussion on how ion profile modifications influence the harmonics is also presented. C1 LAWRENCE LIVERMORE NATL LAB,DEPT PHYS,LIVERMORE,CA 94550. UNIV CALIF LOS ANGELES,DEPT ELECT ENGN,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP WILKS, SC (reprint author), LAWRENCE LIVERMORE NATL LAB,DIV X,LIVERMORE,CA 94550, USA. NR 25 TC 75 Z9 75 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD FEB PY 1993 VL 21 IS 1 BP 120 EP 124 DI 10.1109/27.221110 PG 5 WC Physics, Fluids & Plasmas SC Physics GA LD709 UT WOS:A1993LD70900015 ER PT J AU DORAISWAMI, R LIU, W TRUDNOWSKI, DJ AF DORAISWAMI, R LIU, W TRUDNOWSKI, DJ TI REAL-TIME ESTIMATION OF THE PARAMETERS OF POWER-SYSTEM SMALL-SIGNAL OSCILLATIONS SO IEEE TRANSACTIONS ON POWER SYSTEMS LA English DT Article DE SECURITY MONITOR; ALARM PROCESSOR; REAL-TIME MEASUREMENT; SHORT-TIME DATA ESTIMATION ID PRONY AB It is shown that finite records of measured power system signals can be exactly modelled or generated by a linear transfer function excited by a unit impulse input. The coefficients of the numerator polynomial and denominator polynomial of the transfer function completely characterize the signal and are called the linear predictive code (LPC). The signal model using the LPC can then be used to compute various signal attributes such as frequency, the presence or absence of critical modes, the degree of damping, the amplitude of various signal components and most importantly to predict the future evolution of the signal. A scheme for on-line monitoring of the LPC's of short time records of power system signals is developed such that the signal attributes may be displayed in decreasing order of importance but increasing precision. The proposed scheme is evaluated using real-time simulations of various power system oscillations. C1 PACIFIC NW LAB, RICHLAND, WA 99352 USA. RP DORAISWAMI, R (reprint author), UNIV NEW BRUNSWICK, DEPT ELECT ENGN, FREDERICTON E3B 5A3, NB, CANADA. NR 6 TC 21 Z9 21 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-8950 J9 IEEE T POWER SYST JI IEEE Trans. Power Syst. PD FEB PY 1993 VL 8 IS 1 BP 74 EP 83 DI 10.1109/59.221251 PG 10 WC Engineering, Electrical & Electronic SC Engineering GA KZ377 UT WOS:A1993KZ37700011 ER PT J AU BADGWELL, TA EDGAR, TF TRACHTENBERG, I YETTER, G ELLIOTT, JK ANDERSON, RL AF BADGWELL, TA EDGAR, TF TRACHTENBERG, I YETTER, G ELLIOTT, JK ANDERSON, RL TI INSITU MEASUREMENT OF WAFER TEMPERATURES IN A LOW-PRESSURE CHEMICAL VAPOR-DEPOSITION FURNACE SO IEEE TRANSACTIONS ON SEMICONDUCTOR MANUFACTURING LA English DT Article ID CVD; NITRIDE; LPCVD AB Axial and radial temperature profiles within the wafer load of a multiwafer LPCVD furnace have been measured in situ using a pair of instrumented wafers. Our measurements confirm that the wafer load is not in thermal equilibrium with the furnace tube, as has been widely assumed in many modeling studies. The measurements confirm temperature variations predicted previously from a study of polysilicon film thickness profiles. Temperature variations were small for wafers near the center of the 150 wafer load. However, axial variations of up to 25-degrees-C and radial variations of up to 5-degrees-C were measured at the extremes of the wafer load. For a representative polysilicon deposition data set, axial and radial film thickness variations were found to correlate closely with measured temperature variations. The temperature profile was found to be insensitive to gas composition and flowrate, establishing radiation as the dominant mode of heat transfer. A pair of polysilicon coated quartz radiation shields were shown to improve polysilicon film thickness uniformity both down the load (along the furnace axis) and across each wafer. C1 SEMATECH INC,AUSTIN,TX 78741. UNIV TEXAS,DEPT CHEM ENGN,AUSTIN,TX 78712. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP BADGWELL, TA (reprint author), FISHER ROSEMOUNT SYST DIV,AUSTIN,TX 78754, USA. NR 14 TC 12 Z9 12 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 0894-6507 J9 IEEE T SEMICONDUCT M JI IEEE Trans. Semicond. Manuf. PD FEB PY 1993 VL 6 IS 1 BP 65 EP 71 DI 10.1109/66.210659 PG 7 WC Engineering, Manufacturing; Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA KN088 UT WOS:A1993KN08800006 ER PT J AU TERZAGHIHOWE, M AF TERZAGHIHOWE, M TI FACTORS REGULATING THE EMERGENCE OF SPONTANEOUS AND X-RAY-INDUCED VARIANTS IN PRIMARY RAT TRACHEAL EPITHELIAL-CELL CULTURES SO IN VITRO CELLULAR & DEVELOPMENTAL BIOLOGY-ANIMAL LA English DT Article DE TRANSFORMATION; CARCINOGENESIS; LUNG; CELL DENSITY ID PRENEOPLASTIC TRANSFORMATION; GROWTH; CARCINOGEN; PROLIFERATION; PARTICLES; PYRUVATE AB A series of experiments have been carried out to identify those factors that affect the number of altered detected in control, nonexposed, and radiation-exposed primary cultures of rat tracheal epithelial cells. The number of colony forming cells per milliliter of culture medium and the frequency with which the culture medium is changed seemed to be the most critical factors regulating the emergence of induced and spontaneous variants. Increasing the number of cells plated so that of colony forming cells increase from 25 to 200 per ml, regardless of the dish size used, was associated with a 200-fold decline in the frequency of spontaneous variants and a 40-fold decline in X-ray-induced variants. Increasing the interval between medium changes from 3 to 7 days after the first week of culture was associated with a 10-fold decrease in the frequency of spontaneous variants. The frequency of spontaneous and induced variants is markedly less dependent on culture density at densities between 150 and 600 colony forming cells per ml. The type of medium used to establish primary cultures had little effect on the frequency of variants detected. Similarly, when assays were performed at densities in excess of 150 colony forming cells per ml the frequency of spontaneous and x-ray-induced variants was not affected by the absence of epidermal growth factor, increased levels of calcium (final concentration, 0.8 mM), or by removal of pyruvate from the selection medium. RP TERZAGHIHOWE, M (reprint author), OAK RIDGE NATL LAB,DIV BIOL,POB 2009,MS 8077,OAK RIDGE,TN 37831, USA. FU NCI NIH HHS [CA34695] NR 28 TC 8 Z9 8 U1 0 U2 1 PU SOC IN VITRO BIOLOGY PI UPPER MARLBORO PA 9315 LARGO DR W #255, UPPER MARLBORO, MD 20774-4755 SN 1071-2690 J9 IN VITRO CELL DEV-AN JI In Vitro Cell. Dev. Biol.-Anim. PD FEB PY 1993 VL 29 IS 2 BP 120 EP 126 PG 7 WC Cell Biology; Developmental Biology SC Cell Biology; Developmental Biology GA KP821 UT WOS:A1993KP82100012 PM 8473269 ER PT J AU OLSEN, CS HAEGEL, NM WHITE, AM HUFFMAN, JE KINOSHITA, FF BEEMAN, JW AF OLSEN, CS HAEGEL, NM WHITE, AM HUFFMAN, JE KINOSHITA, FF BEEMAN, JW TI NEAR-CONTACT DIFFUSION AND COMPENSATION IN EXTRINSIC PHOTOCONDUCTORS SO INFRARED PHYSICS LA English DT Article AB Carrier diffusion from heavily doped contact regions has been experimentally monitored with resistivity measurements of variable thickness Si:P extrinsic photoconductors (n+-n-n+). Modeling of free carrier diffusion at the interface of heavily doped contacts and highly resistive bulk at low temperatures predicts extended regions (5-30 mum) of excess carriers in high purity materials so that, in thin device structures, free carrier diffusion profiles from each contact will overlap and determine the resistivity of the device. In this work, a decrease in resistivity of four orders of magnitude was observed in a 5 mum thick structure compared to a 10 mum thick device. The resistivity of an ohmic structure in the thin limit is strongly dependent on the bulk and near-contact compensation, and resistivity measurements can be used as a sensitive measure of compensation at interfaces or in the tail of implanted layers. C1 ROCKWELL INT CORP,CTR SCI,ANAHEIM,CA 92803. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. DEF RES AGCY,GREAT MALVERN WR14 3PS,WORCS,ENGLAND. RP OLSEN, CS (reprint author), UNIV CALIF LOS ANGELES,DEPT MAT SCI & ENGN,LOS ANGELES,CA 90024, USA. NR 6 TC 2 Z9 2 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0020-0891 J9 INFRARED PHYS PD FEB PY 1993 VL 34 IS 1 BP 61 EP 66 DI 10.1016/0020-0891(93)90034-5 PG 6 WC Optics; Physics, Applied SC Optics; Physics GA KP230 UT WOS:A1993KP23000009 ER PT J AU PANCHAL, CB FRANCE, DM AF PANCHAL, CB FRANCE, DM TI HEAT-TRANSFER AND PRESSURE-DROP IN LARGE PITCH SPIRALLY INDENTED TUBES SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article AB Heat transfer and pressure drop experiments are performed with water, at atmospheric pressure in the Prandtl number range 3.6-8.8, flowing in spirally indented tubes for heat exchanger applications. Large pitch geometries are studied which minimize pressure drop. The pitch to indentation height ratio is in the range of 23.7-120, which is beyond the range generally considered in previous investigations. Four tubes are tested with the indentation height to diameter ratios of 0.0075, 0.021, 0.038 and 0.0 (plain). The tubes are tested in a counter-current flow configuration that produces results directly applicable to heat exchanger design applications. A data reduction technique is developed that is applicable to an arbitrarily augmented tube, and it is verified with the plain-tube data. Heat transfer and pressure drop results from the spirally indented tubes are compared to extensions of correlations for similar geometries and to limited data available at large pitches. C1 UNIV ILLINOIS,CHICAGO,IL 60680. RP PANCHAL, CB (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 15 TC 15 Z9 15 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD FEB PY 1993 VL 36 IS 3 BP 565 EP 576 DI 10.1016/0017-9310(93)80032-P PG 12 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA KN753 UT WOS:A1993KN75300004 ER PT J AU MACTOTH, L BOND, WD AVENS, LR AF MACTOTH, L BOND, WD AVENS, LR TI AQUEOUS AND PYROCHEMICAL REPROCESSING OF ACTINIDE FUELS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB Processing of the nuclear fuel actinides has developed in two independent directions-aqueous processing and pyroprocessing. Similarities in the two processes, their goals, and restraints are indicated in brief parallel descriptions along with distinguishing advantages and areas of future development. It is suggested that from a technical viewpoint, the ultimate process might be a hybrid which incorporates the best steps of each process. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MACTOTH, L (reprint author), OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN, USA. NR 21 TC 2 Z9 2 U1 2 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD FEB PY 1993 VL 45 IS 2 BP 35 EP 39 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA KK866 UT WOS:A1993KK86600008 ER PT J AU PIERCE, RD JOHNSON, TR MCPHEETERS, CC LAIDLER, JJ AF PIERCE, RD JOHNSON, TR MCPHEETERS, CC LAIDLER, JJ TI PROGRESS IN THE PYROCHEMICAL PROCESSING OF SPENT NUCLEAR-FUELS SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB Pyrochemical processes are being developed to recover actinides from spent fuels from light-water reactors and integral fast reactors. The transuranic elements from light-water reactors will be introduced into the integral fast reactor fuel cycle. To meet the requirements of that fuel cycle, transuranic elements are recovered as oxide-free metal containing some fission products. This article discusses pyrochemical processes for recovering actinides from light-water reactor and integral fast reactor fuels and for treating the high-level wastes from these processes. The development status of these processes and the plans to demonstrate them using facilities at Experimental Breeder Reactor II are also described. RP PIERCE, RD (reprint author), ARGONNE NATL LAB,DIV CHEM TECHNOL,ARGONNE,IL 60439, USA. NR 16 TC 7 Z9 7 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD FEB PY 1993 VL 45 IS 2 BP 40 EP 44 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA KK866 UT WOS:A1993KK86600009 ER PT J AU SCHOENBORN, BP WANG, H KELLEY, MA DIMMLER, G RANKOWITZ, S AF SCHOENBORN, BP WANG, H KELLEY, MA DIMMLER, G RANKOWITZ, S TI A DATA-ACQUISITION SYSTEM FOR AREA DETECTORS SO JOURNAL OF APPLIED CRYSTALLOGRAPHY LA English DT Article ID NEUTRON AB The use of position-sensitive area detectors with high-flux radiation sources demands high-rate data-acquisition systems. Ideally, such devices should be commercially available and machine independent. In this paper, the basic features of such a system are described. The steps are highlighted that determine the counting rates of present-day addressing-logic and computer-bus speeds. The improvements expected with a new industrial standard bus system are briefly described. C1 BROOKHAVEN NATL LAB,DEPT BIOL,CTR STRUCT BIOL,UPTON,NY 11973. BROOKHAVEN NATL LAB,DIV INSTRUMENTAT,UPTON,NY 11973. NR 10 TC 0 Z9 0 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0021-8898 J9 J APPL CRYSTALLOGR JI J. Appl. Crystallogr. PD FEB 1 PY 1993 VL 26 BP 9 EP 14 DI 10.1107/S0021889892007088 PN 1 PG 6 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA KM898 UT WOS:A1993KM89800003 ER PT J AU VELLANKI, J NADELLA, RK RAO, MV HOLLAND, OW SIMONS, DS CHI, PH AF VELLANKI, J NADELLA, RK RAO, MV HOLLAND, OW SIMONS, DS CHI, PH TI MEV ENERGY FE AND CO IMPLANTS TO OBTAIN BURIED HIGH-RESISTANCE LAYERS AND TO COMPENSATE DONOR IMPLANT TAILS IN INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HIGH-RESISTIVITY LAYERS; ION-IMPLANTATION; DOPED INP; BOMBARDMENT; REDISTRIBUTION; CRYSTALS AB High-energy Fe and Co implantations were performed into InP:Sn at room temperature and 200-degrees-C in the energy range 0.34-5.0 MeV. Range statistics were calculated for these ions in the above energy range. For the room-temperature implants, implant redistribution peaks around 0.8R(p) and R(p) + DELTAR(p), and both in- and out-diffusion of the implant are observed in the secondary-ion-mass-spectroscopy profiles of the annealed samples. The implant redistribution present in the room-temperature implants is much different than in elevated-temperature implants. For buried (high-energy) implants, much of the implant diffusion is eliminated if the implants are performed at 200-degrees-C. For 200-degrees-C implants, the yield of the Rutherford backscattering spectra on the annealed samples is close to that of a virgin sample. The MeV energy Fe and Co implantations at 200-degrees-C are useful to obtain thermally stable, buried, and high-resistance layers of good crystalline quality in n-type InP and for the compensation of the tail of the buried n-type implant. However, due to the low solubility of Fe and Co in InP, the implants of these species are useful only to compensate n-type carriers with concentrations below 10(17) cm-3. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. NATL INST STAND & TECHNOL,DIV SURFACE & MICROANAL SCI,GAITHERSBURG,MD 20899. RP VELLANKI, J (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 33 TC 24 Z9 24 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 FEB 1 PY 1993 VL 73 IS 3 BP 1126 EP 1132 DI 10.1063/1.353277 PG 7 WC Physics, Applied SC Physics GA KK921 UT WOS:A1993KK92100018 ER PT J AU MCCUNE, WW AF MCCUNE, WW TI SINGLE AXIOMS FOR GROUPS AND ABELIAN-GROUPS WITH VARIOUS OPERATIONS SO JOURNAL OF AUTOMATED REASONING LA English DT Article DE SINGLE AXIOMS; ABELIAN GROUPS; OTTER AB This paper summarizes the results of an investigation into single axioms for groups, both ordinary and Abelian, with each of following six sets of operations: {product, inverse}, (division}, {double division, identity}, {double division, inverse}, {division, identity}, and }division, inverse}. In all but two of the twelve corresponding theories, we present either the first single axioms known to us or single axioms shorter than those previously known to us. The automated theorem-proving program OTTER was used extensively to construct sets of candidate axioms and to search for and find proofs that given candidate axioms are in fact single axioms. C1 ARGONNE NATL LAB,DIV MATH & COMP SCI,ARGONNE,IL 60439. NR 17 TC 23 Z9 23 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-7433 J9 J AUTOM REASONING JI J. Autom. Reasoning PD FEB PY 1993 VL 10 IS 1 BP 1 EP 13 DI 10.1007/BF00881862 PG 13 WC Computer Science, Artificial Intelligence SC Computer Science GA MH620 UT WOS:A1993MH62000001 ER PT J AU WOS, L AF WOS, L TI THE PROBLEM OF AUTOMATED THEOREM FINDING SO JOURNAL OF AUTOMATED REASONING LA English DT Article DE THEOREM FINDING; UNSOLVED RESEARCH PROBLEM AB This article is the twenty-fifth of a series of articles discussing various open research problems in automated reasoning. The problem proposed for research asks one to identify appropriate properties to permit an automated reasoning program to find new and interesting theorems, in contrast to proving conjectured theorems. Such programs are now functioning in many domains as valuable reasoning assistants. A sharp increase in their value would occur if they could also be used as colleagues to (so to speak) produce research on their own. C1 ARGONNE NATL LAB,ARGONNE,IL 60439. NR 4 TC 12 Z9 13 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-7433 J9 J AUTOM REASONING JI J. Autom. Reasoning PD FEB PY 1993 VL 10 IS 1 BP 137 EP 138 DI 10.1007/BF00881868 PG 2 WC Computer Science, Artificial Intelligence SC Computer Science GA MH620 UT WOS:A1993MH62000007 ER PT J AU ROSENBERG, AH GOLDMAN, E DUNN, JJ STUDIER, FW ZUBAY, G AF ROSENBERG, AH GOLDMAN, E DUNN, JJ STUDIER, FW ZUBAY, G TI EFFECTS OF CONSECUTIVE AGG CODONS ON TRANSLATION IN ESCHERICHIA-COLI, DEMONSTRATED WITH A VERSATILE CODON TEST SYSTEM SO JOURNAL OF BACTERIOLOGY LA English DT Article ID HIGH-LEVEL EXPRESSION; TRANSFER-RNA GENES; UNFAVORABLE CODONS; MESSENGER-RNA; MAXIMUM RATE; USAGE; POLYMERASE; SUPPRESSION; INVIVO AB A system for testing the effects of specific codons on gene expression is described. Tandem test and control genes are contained in a transcription unit for bacteriophage T7 RNA polymerase in a multicopy plasmid, and nearly identical test and control mRNAs are generated from the primary transcript by RNase III cleavages. Their coding sequences, derived from T7 gene 9, are translated efficiently and have few low-usage codons of Escherichia coli. The upstream test gene contains a site for insertion of test codons, and the downstream control gene has a 45-codon deletion that allows test and control mRNAs and proteins to be separated by gel electrophoresis. Codons can be inserted among identical flanking codons after codon 13, 223, or 307 in codon test vectors pCT1, pCT2, and pCT3, respectively, the third site being six codons from the termination codon. The insertion of two to five consecutive AGG (low-usage) arginine codons selectively reduced the production of full-length test protein to extents that depended on the number of AGG codons, the site of insertion, and the amount of test mRNA. Production of aberrant proteins was also stimulated at high levels of mRNA. The effects occurred primarily at the translational level and were not produced by CGU (high-usage) arginine codons. Our results are consistent with the idea that sufficiently high levels of the AGG mRNA can cause essentially all of the tRNA(AGG) in the cell to become sequestered in translating peptidyl-tRNA(AGG)-mRNA-ribosome complexes stalled at the first of two consecutive AGG codons and that the approach of an upstream translating ribosome stimulates a stalled ribosome to frameshift, hop, or terminate translation. C1 COLUMBIA UNIV,FAIRCHILD CTR BIOL SCI,NEW YORK,NY 10027. UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT MICROBIOL & MOLEC GENET,NEWARK,NJ 07103. RP ROSENBERG, AH (reprint author), BROOKHAVEN NATL LAB,DEPT BIOL,UPTON,NY 11973, USA. FU NIGMS NIH HHS [GM27711] NR 29 TC 149 Z9 158 U1 1 U2 7 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD FEB PY 1993 VL 175 IS 3 BP 716 EP 722 PG 7 WC Microbiology SC Microbiology GA KJ722 UT WOS:A1993KJ72200020 PM 7678594 ER PT J AU DUAN, Z HAMPDENSMITH, MJ DATYE, A NIGREY, P QUINTANA, C SYLWESTER, AP AF DUAN, Z HAMPDENSMITH, MJ DATYE, A NIGREY, P QUINTANA, C SYLWESTER, AP TI SYNTHESIS, CHARACTERIZATION, AND CATALYTIC-HYDROGENATION ACTIVITY OF HIGHLY DISPERSED FE, RH, AND RH FE POWDERS SO JOURNAL OF CATALYSIS LA English DT Article ID REACTIVE METAL POWDERS; ORGANOMETALLIC CHEMISTRY; BIMETALLIC CATALYSTS; SUPPORTED RHODIUM; IRON C1 UNIV NEW MEXICO, DEPT CHEM, ALBUQUERQUE, NM 87131 USA. UNIV NEW MEXICO, DEPT CHEM ENGN, ALBUQUERQUE, NM 87131 USA. UNIV NEW MEXICO, CTR MICROENGN CERAM, ALBUQUERQUE, NM 87131 USA. SANDIA NATL LABS, DIV 6211, ALBUQUERQUE, NM 87185 USA. OI Datye, Abhaya/0000-0002-7126-8659 NR 22 TC 9 Z9 9 U1 0 U2 0 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 FEB PY 1993 VL 139 IS 2 BP 504 EP 512 DI 10.1006/jcat.1993.1044 PG 9 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA KK614 UT WOS:A1993KK61400017 ER PT J AU BOFFA, AB BELL, AT SOMORJAI, GA AF BOFFA, AB BELL, AT SOMORJAI, GA TI VANADIUM-OXIDE DEPOSITED ON AN RH FOIL - CO AND CO2 HYDROGENATION REACTIVITY SO JOURNAL OF CATALYSIS LA English DT Article ID METAL-SUPPORT INTERACTIONS; RHODIUM CATALYSTS; OVERLAYERS; TITANIA; METHANATION; CHEMISORPTION; DESORPTION; MECHANISM; PALLADIUM; KINETICS C1 UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, DEPT MET & CERAM, BERKELEY, CA 94720 USA. RP LAWRENCE BERKELEY LAB, CTR ADV MAT, DIV MAT SCI, BERKELEY, CA 94720 USA. OI Bell, Alexis/0000-0002-5738-4645 NR 29 TC 42 Z9 42 U1 0 U2 11 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 FEB PY 1993 VL 139 IS 2 BP 602 EP 610 DI 10.1006/jcat.1993.1053 PG 9 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA KK614 UT WOS:A1993KK61400026 ER PT J AU KENNEL, SJ LANKFORD, TK FOOTE, LJ SHINPOCK, SG STRINGER, C AF KENNEL, SJ LANKFORD, TK FOOTE, LJ SHINPOCK, SG STRINGER, C TI CD44 EXPRESSION ON MURINE TISSUES SO JOURNAL OF CELL SCIENCE LA English DT Article DE CD44; TISSUE DISTRIBUTION; SPLICE VARIANTS ID CELL-SURFACE GLYCOPROTEINS; LYMPHOCYTE HOMING RECEPTOR; RAT MONOCLONAL-ANTIBODIES; MOLECULAR-CLONING; HIGH ENDOTHELIUM; ANTIGEN; PGP-1; HYALURONATE; PROTEINS; DISTINCT AB CD44 is a cell surface glycoprotein found on lymphoid and epithelial cells. Its primary function on lymphocytes and macrophages is to mediate interaction with endothelium, while its function on epithelial cells is not known. The protein has many different forms, generated by alternative mRNA splicing and by post-translational modification, which may mediate different functions. During previous work on murine lung tumor cells, mAb 133-13A was isolated and shown to recognize a surface glycoprotein, P100, of 90-100 x 10(3) M(r). Amino acid sequence analysis of purified P100 indicates that it is CD44. Since few data exist to indicate which forms of CD44 are present in different normal tissues, mAb 133-13A was used to analyze CD44 expression in mouse tissue. Quantitative data on the distribution of CD44(P100) in mice show that spleen, thymus, liver, intestine, uterus and choroid of the eye are major sites of expression. In addition, epithelia of adrenals, esophagus and trachea are CD44(P100) positive. Previous work on human cell lines has implicated a high molecular mass (130-160 x 10(3) M(r)) form of the glycoprotein as the form expressed in epithelial cells and carcinomas. Isolation of CD44 proteins from lymphoid tissues in the mouse indicate that, as in human lymphoid tissue, the low molecular mass form (80-90 x 10(3) M(r)) is predominately expressed. These data show that both small (approximately 81 x 10(3) M(r)) and large forms of the glycoprotein are expressed in basal epithelia of esophagus and trachea and in salivary gland, while only the small form is expressed in epithelium of the adrenal cortex and in the murine lung and mammary carcinomas studied. While these data cannot distinguish between specific splice variants, they show that the large forms of CD44 are minor components in normal tissue and seem to be found only in basal epithelium. The CD44 of low M(r) found in epithelial tissues is probably associated with lymphoid cell types in the tissues. RP KENNEL, SJ (reprint author), OAK RIDGE NATL LAB,POB 2009,BLDG 9220,MS-8077,OAK RIDGE,TN 37831, USA. NR 42 TC 67 Z9 68 U1 0 U2 1 PU COMPANY OF BIOLOGISTS LTD PI CAMBRIDGE PA BIDDER BUILDING CAMBRIDGE COMMERCIAL PARK COWLEY RD, CAMBRIDGE, CAMBS, ENGLAND CB4 4DL SN 0021-9533 J9 J CELL SCI JI J. Cell Sci. PD FEB PY 1993 VL 104 BP 373 EP 382 PN 2 PG 10 WC Cell Biology SC Cell Biology GA KU465 UT WOS:A1993KU46500016 PM 8505366 ER PT J AU MILLER, WF AF MILLER, WF TI PRESENT AND FUTURE NUCLEAR-REACTOR DESIGNS - WEIGHING THE ADVANTAGES AND DISADVANTAGES OF NUCLEAR-POWER WITH AN EYE ON IMPROVING SAFETY AND MEETING FUTURE-NEEDS SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. RP MILLER, WF (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. NR 9 TC 1 Z9 1 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD FEB PY 1993 VL 70 IS 2 BP 109 EP 114 PG 6 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA KT436 UT WOS:A1993KT43600016 ER PT J AU MENEZES, WJC KNICKELBEIN, MB AF MENEZES, WJC KNICKELBEIN, MB TI PHOTODISSOCIATION SPECTROSCOPY OF NBNARM COMPLEXES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ULTRAVIOLET-VISIBLE SPECTRA; SURFACE PLASMA RESONANCES; SMALL SODIUM CLUSTERS; SMALL METAL-CLUSTERS; RARE-GAS COMPLEXES; NIOBIUM CLUSTERS; NICKEL CLUSTERS; ABSORPTION-SPECTROSCOPY; VIBRONIC SPECTROSCOPY; IONIZATION-POTENTIALS AB The optical absorption spectra of niobium clusters containing 7 to 20 atoms have been measured from 336 to 634 nm by way of photodissociation action spectroscopy of the corresponding van der Waals complexes with argon atoms: Nb(n) Ar(m) --> hv Nb(n) + m Ar. The clusters in this size range do not display discrete absorption bands characteristic of molecular behavior, but rather absorption cross sections which increase monotonically with decreasing wavelength. This behavior is in qualitative accord with the absorption behavior predicted by the spherical Mie model for small niobium spheres, however, the measured cross sections are 2-5 times larger than predicted over this wavelength range, with the smallest clusters displaying the largest deviations. Interpreted within the classical electrodynamic framework, these observations suggest that the absorption spectra derive oscillator strength from an incipient surface plasmon, redshifted from its predicted resonance frequency in the vacuum ultraviolet. RP MENEZES, WJC (reprint author), ARGONNE NATL LAB, DIV CHEM, ARGONNE, IL 60439 USA. NR 92 TC 49 Z9 49 U1 1 U2 8 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 1993 VL 98 IS 3 BP 1856 EP 1866 DI 10.1063/1.464220 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK858 UT WOS:A1993KK85800011 ER PT J AU VRAKKING, MJJ LEE, YT GILBERT, RD CHILD, MS AF VRAKKING, MJJ LEE, YT GILBERT, RD CHILD, MS TI RESONANCE-ENHANCED ONE-PHOTON AND 2-PHOTON IONIZATION OF WATER MOLECULE - PRELIMINARY-ANALYSIS BY MULTICHANNEL QUANTUM DEFECT THEORY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID VACUUM ULTRAVIOLET; RYDBERG STATES; PREDISSOCIATION DYNAMICS; ABSORPTION-SPECTRA; H2O; D2O; SPECTROSCOPY; PHOTOIONIZATION; REGION; BEAM AB Experimental results are presented for one- and two-photon ionization of the water molecule, obtained using a near transform-limited xuv laser. The single-photon ionization results show rotationally resolved autoionizing resonances corresponding to members of Rydberg series (nd <-- 1b1; n = 6-11) converging on the H2O+ (100) vibrational state. The two-color (1 + 1) multiphoton ionization results show rotationally resolved structure corresponding to Rydberg series (nd <-- 1b1; n greater-than-or-equal-to 6) converging on the H2O+ (000) vibrational state. Typical line-widths below and above the H2O+ (000) ionization threshold are 1 and 2 cm-1, respectively. The experimental results are simulated by multichannel quantum defect theory (MQDT). The main features in the spectrum are reproduced in a treatment of the rotational channel interactions with partial l mixing. It is argued that remaining discrepancies between experiment and theory arise from perturbative interactions between the (nd <-- 1b1) levels and members of the (nd <-- 3a1) Rydberg series. Also, it is argued that in the (1 + 1) multiphoton ionization spectra lines may be missing due to selective predissociation. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV OXFORD,DEPT THEORET CHEM,OXFORD OX1 3UB,ENGLAND. RP VRAKKING, MJJ (reprint author), LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720, USA. RI Lee, Yuan-Tseh/F-7914-2012 NR 39 TC 17 Z9 17 U1 1 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 FEB 1 PY 1993 VL 98 IS 3 BP 1902 EP 1915 DI 10.1063/1.464224 PG 14 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK858 UT WOS:A1993KK85800015 ER PT J AU STOLOW, A LEE, YT AF STOLOW, A LEE, YT TI PHOTODISSOCIATION DYNAMICS OF CO2 AT 157.6 NM BY PHOTOFRAGMENT-TRANSLATIONAL SPECTROSCOPY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STRUCTURE BRANCHING RATIOS; STATE DISTRIBUTION; MOLECULES; OXYGEN AB The photodissociation Of CO2 at 157 nm was studied by the photofragment-translational spectroscopy technique. Product time-of-flight spectra were recorded and center-of-mass translational energy distributions were determined. Two electronic channels were observed-one forming O(1D) and the other O(3P). With previously determined anisotropy parameters of beta = 2 for the O(3P) channel and beta = 0 for the O(1D) channel, an electronic branching ratio of 6% +/- 2%O(3P) was obtained, consistent with previous results. The translational energy distribution for the CO(upsilon) + O(3P) channel was very broad (over 30 kcal/mol) and appeared to peak near CO(upsilon = 0). The value of beta = 2 for the O(3P) channel was confirmed by comparing Doppler profiles, derived from our measured translational energy distribution, with previously measured Doppler profiles. This suggests that the O(3P) channel arises from a direct transition to an excited triplet state. The O(1D) channel had a structured time-of-flight which related to rovibrational distributions of the CO product. The influence of the excitation of the CO2(nu2) bending mode was investigated and shown to have a small but not negligible contribution. Based upon a comparison of our data with a previous vacuum-ultraviolet (VUV) laser induced fluorescence study, we obtain as our best estimate of the vibrational branching ratio, CO(upsilon = 0)/CO(upsilon = 1) = 1.9, for the CO(upsilon) + O(1D) channel. C1 UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. LAWRENCE BERKELEY LAB,DIV CHEM SCI,BERKELEY,CA 94720. RI Lee, Yuan-Tseh/F-7914-2012 NR 16 TC 27 Z9 27 U1 0 U2 13 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 FEB 1 PY 1993 VL 98 IS 3 BP 2066 EP 2076 DI 10.1063/1.464238 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK858 UT WOS:A1993KK85800030 ER PT J AU RAY, JR WOLF, RJ AF RAY, JR WOLF, RJ TI MONTE-CARLO SIMULATIONS AT CONSTANT CHEMICAL-POTENTIAL AND PRESSURE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EMBEDDED-ATOM-METHOD; MOLECULAR-DYNAMICS; ENSEMBLES; METALS AB The usual way of carrying out Monte Carlo simulations of open systems is by using the grand canonical ensemble. In the grand canonical (TVmu) ensemble a system of fixed volume V is in contact with a temperature reservoir having temperature T, and a particle reservoir having chemical potential mu. In order to obtain values for thermodynamic functions for a given pressure in TVmu Monte Carlo simulations a series of simulations at fixed T and V and different chemical potentials is carried out to determine P(mu), and then an extrapolation to the desired pressure must be carried out. Here we discuss Monte Carlo simulations of open systems in the RPmu ensemble in which an energy R, the chemical potential mu, and the pressure are held fixed during the simulation. Thus each RPmu ensemble simulation replaces a set of TVmu simulations. Simulations of an embedded atom model of liquid palladium are discussed using the new method. C1 WESTINGHOUSE SAVANNAH RIVER CO,SAVANNAH RIVER TECHNOL CTR,AIKEN,SC 29808. RP RAY, JR (reprint author), CLEMSON UNIV,KINARD LAB PHYS,DEPT PHYS & ASTRON,CLEMSON,SC 29634, USA. NR 12 TC 23 Z9 23 U1 1 U2 5 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 FEB 1 PY 1993 VL 98 IS 3 BP 2263 EP 2267 DI 10.1063/1.464207 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK858 UT WOS:A1993KK85800052 ER PT J AU CAI, ZH HUANG, KG MONTANO, PA RUSSELL, TP BAI, JM ZAJAC, GW AF CAI, ZH HUANG, KG MONTANO, PA RUSSELL, TP BAI, JM ZAJAC, GW TI EXPERIMENTAL-STUDY OF THE SURFACE-STRUCTURE OF DIBLOCK COPOLYMER FILMS USING MICROSCOPY AND X-RAY-SCATTERING SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID NEUTRON REFLECTIVITY; THIN-FILMS; DIFFRACTION; MONOLAYERS; FLUORESCENCE; MORPHOLOGY; GROWTH AB The surface structure of a model system was measured in real space by atomic force and optical microscopies, and compared with that obtained from measurements in reciprocal space by x-ray reflectivity and off-specular scattering at grazing incidence. Experiments were performed on films of symmetric diblock copolymers of polystyrene and polymethylmethacrylate, whose surfaces were covered by micrometer-size islands or holes (domains) of uniform height. The correlation functions extracted from the images of the film surfaces show weak peaks in the real-space domain distribution. The corresponding structures were also found in reciprocal space. The height of the domains obtained from the scattering measurements was found to be in excellent agreement with that obtained by atomic force microscopy. We developed a formalism using the kinematical approximation for the analysis of the x-ray-scattering measurements. We used a multilayer film model with roughness at each interface and relief domains at the surface. We extracted the domain-domain correlation functions for the x-ray-scattering analysis from the atomic force and optical microscopy images. C1 IBM CORP,DIV RES,ALMADEN RES CTR,SAN JOSE,CA 95120. CUNY BROOKLYN COLL,DEPT PHYS,BROOKLYN,NY 11210. AMOCO RES CTR,NAPERVILLE,IL 60566. RP CAI, ZH (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. RI Bai, Jianming/O-5005-2015 NR 36 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 1993 VL 98 IS 3 BP 2376 EP 2386 DI 10.1063/1.464165 PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK858 UT WOS:A1993KK85800065 ER PT J AU EVANS, JW AF EVANS, JW TI ZGB SURFACE-REACTION MODEL WITH HIGH DIFFUSION RATES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID KINETIC PHASE-TRANSITIONS; MEAN-FIELD THEORY; HETEROGENEOUS CATALYSIS; POISONING TRANSITION; COMPUTER-SIMULATIONS AB The diffusionless ZGB (monomer-dimer) surface reaction model exhibits a discontinuous transition to a monomer-poisoned state when the fraction of monomer adsorption attempts exceeds 0.525. It has been claimed that this transition shifts to 2/3 with introduction of rapid diffusion of the monomer species, or of both species. We show this is not the case, 2/3 representing the spinodal rather than the transition point. For equal diffusion rates of both species, we find that the transition only shifts to 0.5951+/-0.0002. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT MATH,AMES,IA 50011. RP EVANS, JW (reprint author), IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011, USA. NR 16 TC 52 Z9 53 U1 1 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 FEB 1 PY 1993 VL 98 IS 3 BP 2463 EP 2465 DI 10.1063/1.464174 PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK858 UT WOS:A1993KK85800074 ER PT J AU CARMAN, HS COMPTON, RN AF CARMAN, HS COMPTON, RN TI ELECTRON-ATTACHMENT TO CN CLUSTERS (N-LESS-THAN-OR-EQUAL-TO-30) SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID CARBON CLUSTERS; ABUNDANCE DISTRIBUTIONS; LASER VAPORIZATION; MAGIC NUMBERS; IONS; MOLECULES; KINETICS; BEAMS; UPS AB Low-energy electron attachment to neutral C(n) clusters (n less-than-or-equal-to 30) has been studied using the Rydberg electron transfer technique. The mass spectra of C(n)- ions obtained suggest that certain carbon clusters (e.g., C5, C-10, C-12, C-16, C18) have much larger low-energy electron attachment cross sections than other clusters. RP CARMAN, HS (reprint author), OAK RIDGE NATL LAB,DIV HLTH & SAFETY RES,CHEM PHYS SECT,POB 2008,OAK RIDGE,TN 37831, USA. NR 24 TC 17 Z9 17 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 1993 VL 98 IS 3 BP 2473 EP 2476 DI 10.1063/1.464177 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK858 UT WOS:A1993KK85800077 ER PT J AU CESS, RD NEMESURE, S DUTTON, EG DELUISI, JJ POTTER, GL MORCRETTE, JJ AF CESS, RD NEMESURE, S DUTTON, EG DELUISI, JJ POTTER, GL MORCRETTE, JJ TI THE IMPACT OF CLOUDS ON THE SHORTWAVE RADIATION BUDGET OF THE SURFACE ATMOSPHERE SYSTEM - INTERFACING MEASUREMENTS AND MODELS SO JOURNAL OF CLIMATE LA English DT Article ID CLIMATE AB Two datasets have been combined to demonstrate how the availability of more comprehensive datasets could serve to elucidate the shortwave radiative impact of clouds on both the atmospheric column and the surface. These datasets consist of two measurements of net downward shortwave radiation: one of near-surface measurements made at the Boulder Atmospheric Observatory tower, and the other of collocated top-of-the-atmosphere measurements from the Earth Radiation Budget Experiment. Output from the European Centre for Medium-Range Weather Forecasts General Circulation Model also has been used as an aid in interpreting the data, while the data have in turn been employed to validate the model's shortwave radiation code as it pertains to cloud radiation properties. Combined, the datasets and model demonstrate a strategy for determining under what conditions the shortwave radiative impact of clouds leads to a heating or cooling of the atmospheric column. The datasets also show, in terms of a linear slope-offset algorithm for retrieving the net downward shortwave radiation at the surface from satellite measurements, that the clouds present during this study produced a modest negative bias in the retrieved surface flux relative to that inferred from a clear-sky algorithm. C1 NOAA,ENVIRONM RES LABS,CLIMATE MONITORING & DIAGNOST LAB,BOULDER,CO 80303. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. EUROPEAN CTR MEDIUM RANGE WEATHER FORECASTS,READING,BERKS,ENGLAND. RP CESS, RD (reprint author), SUNY STONY BROOK,INST TERR & PLANETARY ATMOSPHERES,STONY BROOK,NY 11794, USA. NR 13 TC 21 Z9 23 U1 0 U2 3 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8755 J9 J CLIMATE JI J. Clim. PD FEB PY 1993 VL 6 IS 2 BP 308 EP 316 DI 10.1175/1520-0442(1993)006<0308:TIOCOT>2.0.CO;2 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KY099 UT WOS:A1993KY09900007 ER PT J AU NGUYEN, HD CHUNG, JN AF NGUYEN, HD CHUNG, JN TI A CHEBYSHEV-LEGENDRE SPECTRAL METHOD FOR THE TRANSIENT SOLUTIONS OF FLOW PAST A SOLID SPHERE SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID MODERATE REYNOLDS-NUMBERS; ROTATING SPHERE; FLUID SPHERE; STEADY FLOW; EXPANSION; EQUATIONS C1 WASHINGTON STATE UNIV,DEPT MECH & MAT ENGN,PULLMAN,WA 99164. RP NGUYEN, HD (reprint author), EG&G IDAHO INC,IDAHO NATL ENGN LAB,IDAHO FALLS,ID 83415, USA. NR 17 TC 5 Z9 5 U1 1 U2 2 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 FEB PY 1993 VL 104 IS 2 BP 303 EP 312 DI 10.1006/jcph.1993.1032 PG 10 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA KM221 UT WOS:A1993KM22100002 ER PT J AU KAZEMINEZHAD, F LEBOEUF, JN BRUNEL, F DAWSON, JM AF KAZEMINEZHAD, F LEBOEUF, JN BRUNEL, F DAWSON, JM TI A DISCRETE MODEL FOR MHD INCORPORATING THE HALL TERM SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID AMPTE ARTIFICIAL COMET; PARTICLE CODE C1 OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. NATL RES COUNCIL CANADA,MONTREAL,QUEBEC,CANADA. RP KAZEMINEZHAD, F (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 17 TC 9 Z9 9 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 FEB PY 1993 VL 104 IS 2 BP 398 EP 417 DI 10.1006/jcph.1993.1039 PG 20 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA KM221 UT WOS:A1993KM22100009 ER PT J AU PALMER, BJ AF PALMER, BJ TI DIRECT APPLICATION OF SHAKE TO THE VELOCITY VERLET ALGORITHM SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Note ID MOLECULAR-DYNAMICS; CONSTRAINTS RP PALMER, BJ (reprint author), PACIFIC NW LAB, DEPT ANALYT SCI, RICHLAND, WA 99352 USA. NR 5 TC 54 Z9 54 U1 0 U2 8 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 FEB PY 1993 VL 104 IS 2 BP 470 EP 472 DI 10.1006/jcph.1993.1045 PG 3 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA KM221 UT WOS:A1993KM22100015 ER PT J AU LENHARD, RJ JOHNSON, TG PARKER, JC AF LENHARD, RJ JOHNSON, TG PARKER, JC TI EXPERIMENTAL-OBSERVATIONS OF NONAQUEOUS-PHASE LIQUID SUBSURFACE MOVEMENT SO JOURNAL OF CONTAMINANT HYDROLOGY LA English DT Article ID POROUS-MEDIA; FLOW; DRAINAGE AB A one-dimensional multiphase flow experiment was conducted to investigate the redistribution of nonaqueous-phase liquids (NAPL's) in the subsurface. NAPL, water and air contents were measured with a dual-energy gamma-radiation attenuation apparatus, and NAPL and water pressures were measured with tensiometers that were inserted into the flow column. In the experiment, which used a sandy porous medium, both two-phase air-water and three-phase air-NAPL-water flow phenomena were measured. In the two-phase component of the experiment, water was drained from an initially water-saturated state by lowering the water table to a specified elevation. After the water drainage decreased to a negligible rate, the three-phase component of the experiment was initiated by infiltrating a 250-mL pulse of NAPL at the upper porous-medium boundary. Following a NAPL redistribution period, the water table was raised, lowered, and raised again. An objective of the experiment was to quantify the entrapment of air and NAPL under transient flow conditions. Analyses of the data showed that air was entrapped during NAPL imbibition, and NAPL and air were entrapped during water imbibition. The volume of entrapped fluids for similar saturation paths was reproducible, which suggested that fluid entrapment may be systematically modeled. It was concluded that to predict the movement of NAPL's in the subsurface, where the water-table elevation may fluctuate, constitutive relations among fluid saturations and pressures need to account for nonwetting fluid entrapment. The methodologies for conducting the measurements and associated error analysis are also given in this paper. C1 VIRGINIA POLYTECH INST & STATE UNIV, BLACKSBURG, VA 24061 USA. RP LENHARD, RJ (reprint author), PACIFIC NW LAB, POB 999, MS K6-77, RICHLAND, WA 99352 USA. NR 21 TC 34 Z9 39 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-7722 J9 J CONTAM HYDROL JI J. Contam. Hydrol. PD FEB PY 1993 VL 12 IS 1-2 BP 79 EP 101 DI 10.1016/0169-7722(93)90016-L PG 23 WC Environmental Sciences; Geosciences, Multidisciplinary; Water Resources SC Environmental Sciences & Ecology; Geology; Water Resources GA KQ314 UT WOS:A1993KQ31400004 ER PT J AU BAMBERGER, CE ALEXANDER, KB AF BAMBERGER, CE ALEXANDER, KB TI THE PSEUDOMORPHIC CONVERSION OF PLATELETS OF CR2O3 INTO CRN AND CR3C2 SO JOURNAL OF CRYSTAL GROWTH LA English DT Article AB The conversion of Cr2O3 platelets into platelets of CrN and Cr3C2 by treatment with NH3 and CH4, respectively, has been demonstrated. Because the morphology of the products remained the same as that of the starting material despite significant changes in composition and crystalline structure, the reactions are considered to be pseudomorphic. The microstructures of the CrN and Cr3C2 platelets have been examined by transmission electron microscopy. C1 OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. RP BAMBERGER, CE (reprint author), OAK RIDGE NATL LAB,DIV CHEM,OAK RIDGE,TN 37831, USA. NR 6 TC 2 Z9 2 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD FEB PY 1993 VL 126 IS 4 BP 525 EP 529 DI 10.1016/0022-0248(93)90801-3 PG 5 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA KL957 UT WOS:A1993KL95700002 ER PT J AU FREAR, DR MICHAEL, JR HLAVA, PF AF FREAR, DR MICHAEL, JR HLAVA, PF TI ANALYSIS OF THE REACTION BETWEEN 60SN-40PB SOLDER WITH A PD-PT-AG-CU-AU ALLOY SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE INTERMETALLIC FORMATION; PALINEY 7(TM); PB-SN SOLDER; WETTABILITY ID INTERMETALLIC COMPOUND GROWTH; SN/PB SOLDER; CONDUCTOR METALLIZATION; SOLDERABILITY AB We present the results of a metallurgical study of a 35Pd-30Ag-14Cu-10Au10Pt-1Zn (wt. %) alloy soldered with 60Sn-40Pb for glass-to-metal sealing applications. Mechanical tests were performed on the Pd-Ag-Cu-Au-Pt-Zn alloy and showed that it retains ductility, with an increase in strength, after heat treatments that simulate the glass-to-metal sealing temperature profile. Wetting characteristics of the alloy with 60Sn-40Pb solder were found to be adequate for pin joining applications. The formation and growth of the interfacial intermetallic between 60Sn-40Pb and the Pd-Ag-Cu-Au-Pt-Zn alloy were characterized. The matrix of the intermetallic layer consists of PdSn4 with platinum and gold substituting for the palladium in the crystal structure. Also present were precipitates of Cu3Sn and Ag3Sn. Nano-indentation hardness tests showed that the intermetallic layer has mechanical properties similar to the base metal while retaining good ductility. The intermetallic was also found to have good wettability under solder reflow conditions. We conclude from these tests that the Pd-Ag-Cu-Au-Pt-Zn alloy is a suitable option as a pin material for glass-to-metal sealing applications. RP FREAR, DR (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 21 TC 5 Z9 5 U1 3 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 FEB PY 1993 VL 22 IS 2 BP 185 EP 194 DI 10.1007/BF02665025 PG 10 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA KL348 UT WOS:A1993KL34800006 ER PT J AU AKIMOTO, K WINSKE, D GARY, SP THOMSEN, MF AF AKIMOTO, K WINSKE, D GARY, SP THOMSEN, MF TI NONLINEAR EVOLUTION OF ELECTROMAGNETIC ION-BEAM INSTABILITIES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID POLARIZED ALFVEN WAVES; QUASI-PARALLEL SHOCKS; HYDROMAGNETIC-WAVES; MAGNETIC PULSATIONS; ISEE-2 OBSERVATIONS; EARTHS FORESHOCK; WHISTLER WAVES; WATER GROUP; SOLAR-WIND; BOW SHOCK AB An ion beam streaming along a magnetic field is known to be mainly unstable to two field-aligned, low-frequency electromagnetic instabilities: the ion/ion right-hand resonant instability and ion/ion nonresonant instability. A comparative study of the two instabilities by means of linear analysis and simulation is carried out to investigate and contrast their properties. Linear analysis demonstrates that the nonresonant instability becomes resonant if the density of the ion beam is sufficiently high. When the relative drift speed between the ion beam and the ambient ions is 10 v(A), where v(A) is the Alfven speed, the nonresonant instability undergoes a transition to a resonant interaction at n(b)/n(o) congruent-to 0.065, n(b)(n(o)) being the beam (total ion) density. Hybrid simulations carried out for the densities of n(b)/n(o) = 0.02, 0.1. and 0.25 show both the resonant and nonresonant instabilities result in the formation of nonlinear pulses called pulsations but with distinct features. For example, the pulsations generated by the resonant instability have positive correlation with the ion density, while those generated by the nonresonant instability axe likely to have relatively weak negative correlation. Furthermore, the waves generated by the nonresonant instability are subject to a parametric decay instability and tend to form a state of condensate where the turbulence becomes nearly monochromatic. These features can be utilized to differentiate between pulsations produced by the two instabilities in space and, in particular, short large amplitude magnetic structures. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP AKIMOTO, K (reprint author), TEIKYO UNIV,SCH SCI & TECHNOL,UTSUNOMIYA 320,JAPAN. NR 51 TC 34 Z9 38 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1419 EP 1433 DI 10.1029/92JA02345 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000017 ER PT J AU GARY, SP FUSELIER, SA ANDERSON, BJ AF GARY, SP FUSELIER, SA ANDERSON, BJ TI ION ANISOTROPY INSTABILITIES IN THE MAGNETOSHEATH SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA DEPLETION LAYER; MIRROR WAVES; CYCLOTRON INSTABILITY; BOW SHOCK; MAGNETOSPHERE; MAGNETOPAUSE; TEMPERATURE; DOWNSTREAM; SIMULATION; REGION AB Recent observations in Earth's magnetosheath have delineated several different kinds of magnetic fluctuation spectra below the proton cyclotron frequency. This paper provides a theoretical interpretation for some of these observations, describing solutions of the linear Vlasov dispersion equation for fully electromagnetic instabilities for particle distributions which model those observed in the magnetosheath. The model assumes a high-beta, homogeneous plasma with bi-Maxwellian, anisotropic (T(perpendicular-to p) > T(parallel-to p)) protons; a similarly anisotropic, tenuous, doubly ionized helium component; and isotropic cool electrons. The model also assumes a uniform magnetic field and no relative average drifts among the components. This model yields three growing modes: the proton cyclotron anisotropy, the helium cyclotron anisotropy, and the mirror instabilities. The regimes in beta(p) versus T(perpendicular-to p)/T(parallel-to p) space which correspond to maximum growth rates of the mirror and proton cyclotron anisotropy instabilities are computed, including helium densities appropriate for the magnetosheath; the results show very good agreement with the observations of mirror-like and proton-cyclotron-like events. This agreement with observations implies that the transition between cyclotron and mirror fluctuation dominance is consistent with linear theory. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. RP GARY, SP (reprint author), LOS ALAMOS NATL LAB,GRP SST-7,MS D466,LOS ALAMOS,NM 87545, USA. RI Anderson, Brian/I-8615-2012 NR 33 TC 119 Z9 120 U1 1 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1481 EP 1488 DI 10.1029/92JA01844 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000021 ER PT J AU GOSLING, JT MCCOMAS, DJ PHILLIPS, JL BAME, SJ AF GOSLING, JT MCCOMAS, DJ PHILLIPS, JL BAME, SJ TI GEOMAGNETIC-ACTIVITY ASSOCIATED WITH EARTH PASSAGE OF INTERPLANETARY SHOCK DISTURBANCES AND CORONAL MASS EJECTIONS - REPLY SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Note RP GOSLING, JT (reprint author), LOS ALAMOS NATL LAB,MAIL STOP D438,LOS ALAMOS,NM 87545, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1509 EP 1510 DI 10.1029/92JA02009 PG 2 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000025 ER PT J AU BERNHARDT, PA HUBA, JD PONGRATZ, MB SIMONS, DJ WOLCOTT, JH AF BERNHARDT, PA HUBA, JD PONGRATZ, MB SIMONS, DJ WOLCOTT, JH TI PLASMA IRREGULARITIES CAUSED BY CYCLOID BUNCHING OF THE CRRES G-2 BARIUM RELEASE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ION CLOUDS; CRIT-I; IONOSPHERE; FIELD; INSTABILITY; IONIZATION; STRIATIONS; STABILITY; SIMULATION; EVOLUTION AB The Combined Release and Radiation Effects Satellite (CRRES) spacecraft carried a number of barium thermite canisters for release into the upper atmosphere. The barium release labeled G-2 showed evidence of curved irregularities not aligned with the ambient magnetic field B. The newly discovered curved structures can be explained by a process called cycloid bunching. Cycloid bunching occurs when plasma is created by photoionization of a neutral cloud injected at high velocity perpendicular to B. If the injection velocity is much larger than the expansion speed of the cloud, the ion trail will form a cycloid that has irregularities spaced by the product of the perpendicular injection speed and the ion gyroperiod. Images of the solar-illuminated barium ions are compared with the results of a three-dimensional kinetic simulation. Cycloid bunching is shown to be responsible for the rapid generation of both curved and field-aligned irregularities in the CRRES G-2 experiment. C1 LOS ALAMOS NATL LAB,GRP SST-7,LOS ALAMOS,NM 87545. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,CODE 6780,WASHINGTON,DC 20375, USA. NR 47 TC 11 Z9 14 U1 2 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 FEB 1 PY 1993 VL 98 IS A2 BP 1613 EP 1627 DI 10.1029/92JA00987 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000035 ER PT J AU LI, W EBADIAN, MA WHITE, TL GRUBB, RG AF LI, W EBADIAN, MA WHITE, TL GRUBB, RG TI HEAT-TRANSFER WITHIN A CONCRETE SLAB APPLYING THE MICROWAVE DECONTAMINATION PROCESS SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE CONDUCTION; THERMOPHYSICAL PROPERTIES; TRANSIENT AND UNSTEADY HEAT TRANSFER AB Decontamination of a radioactive contaminated concrete surface is a new technology for the treatment of radioactive waste. In this paper, concrete decontamination using microwave technology is investigated theoretically. A plane wave assumption of microwave propagation has been employed to estimate the microwave field and power dissipation within the concrete. A one-dimensional, unsteady heat conduction model with microwave heat dissipation resulting from microwave-material interaction has been used to evaluate frequency, steel reinforcement within the concrete, and thermal boundary conditions are also considered in the present model. Four commonly used microwave frequencies of 0.896, 2.45, 10.6, and 18.0 GHz have been utilized in the analysis. The results revealed that as the microwave frequency increases to, or higher than 10.6 GHz, the microwave power dissipation shifts toward the front surface of the concrete. Furthermore, it was observed that use of a higher frequency microwave could reduce power intensity requirements needed to raise the temperature difference or thermal stress to the same value in the same period of time. It was found that the presence of reinforcing steel mesh causes part of the microwave energy to be blocked and reflected. Thus, the temperature or thermal stress of the concrete increases before the reinforcement, and decreases after the reinforcement. C1 OAK RIDGE NATL LAB,DIV CHEM TECHNOL,OAK RIDGE,TN 37831. OAK RIDGE NATL LAB,DIV FUS ENERGY,OAK RIDGE,TN 37831. RP LI, W (reprint author), FLORIDA INT UNIV,DEPT MECH ENGN,MIAMI,FL 33199, USA. NR 16 TC 11 Z9 11 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD FEB PY 1993 VL 115 IS 1 BP 42 EP 50 DI 10.1115/1.2910667 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA KP910 UT WOS:A1993KP91000006 ER PT J AU GENEREUX, DP HEMOND, HF MULHOLLAND, PJ AF GENEREUX, DP HEMOND, HF MULHOLLAND, PJ TI SPATIAL AND TEMPORAL VARIABILITY IN STREAMFLOW GENERATION ON THE WEST FORK OF WALKER BRANCH WATERSHED SO JOURNAL OF HYDROLOGY LA English DT Article ID 2 FORESTED WATERSHEDS; HILLSLOPE; HYDROLOGY; FLOW AB Spatially intensive measurements of streamflow were used to document the spatial and temporal variability in streamflow generation on the West Fork of Walker Branch Watershed, a 38.4 ha forested catchment in Oak Ridge, Tennessee. The study focused on a 300 m section of a small stream, and covered a wide range of flow conditions (Q(weir), streamflow at the basin outlet, varied from about 350 to 3500 l min-1). There was enormous spatial variability in the stream inflow, down to the finest scale investigated (reaches 20 m in length). Lateral inflow to longer reaches (60-130 m) was linearly correlated with Q(weir) over the full range of flows studied, making it possible to estimate the spatial pattern of stream inflow from measurement of Q(weir) alone. The heterogeneous nature of the karstic dolomite bedrock was the dominant control on the observed spatial variability in streamflow generation. This thesis is consistent with the results of field investigations using natural tracers, reported in a companion paper. Bedrock structure and lithology may affect streamflow generation directly (via water movement through fractured rock), and indirectly (by influencing the slope and thickness of the overlying soil). While the West Fork contains all the topographic and surface hydrologic features of larger basins (ridge tops, valleys, hollows, spurs, ephemeral and perennial stream channels), it covers an area which is relatively small with respect to the bedrock heterogeneity. Therefore, while the hydrologic processes observed on the West Fork are no doubt typical of those occurring elsewhere in karst terrain, the particular patterns of spatial and temporal variability observed are somewhat specific to the study site. C1 MIT,DEPT CIVIL ENGN,CAMBRIDGE,MA 02139. OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. RI Mulholland, Patrick/C-3142-2012 NR 29 TC 44 Z9 44 U1 1 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-1694 J9 J HYDROL JI J. Hydrol. PD FEB PY 1993 VL 142 IS 1-4 BP 137 EP 166 DI 10.1016/0022-1694(93)90009-X PG 30 WC Engineering, Civil; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA KQ063 UT WOS:A1993KQ06300008 ER PT J AU GENEREUX, DP HEMOND, HF MULHOLLAND, PJ AF GENEREUX, DP HEMOND, HF MULHOLLAND, PJ TI USE OF RN-222 AND CALCIUM AS TRACERS IN A 3-END-MEMBER MIXING MODEL FOR STREAMFLOW GENERATION ON THE WEST FORK OF WALKER BRANCH WATERSHED SO JOURNAL OF HYDROLOGY LA English DT Article ID APPALACHIAN FORESTED CATCHMENT; SOILWATER END-MEMBERS; STREAMWATER CHEMISTRY; HYDROGRAPH SEPARATION; ILWAS WATERSHEDS; ACIDIFICATION; STORMFLOW; HILLSLOPE; RAINFALL; MIXTURE AB Measurements of naturally occurring radon-222 (Rn-222) and calcium (Ca) in surface and subsurface waters on the West Fork of Walker Branch suggest that a simple three-end-member mixing model provides a realistic and useful framework for streamflow generation over a wide range of flow conditions. The three end members are vadose zone water, soil groundwater, and bedrock groundwater. Bedrock groundwater was distinguished from the soil end members on the basis of its high Ca content; 222 Rn concentration was the basis for the distinction between vadose zone water (low Rn-222) and soil groundwater (high Rn-222). The behavior of the end members with changing flow was consistent with a wide variety of environmental observations, including temperature and flow variations at springs, water table responses, the general lack of saturated zones on hillslopes and even near the stream in some places, and the importance of water movement through bedrock. Variability in the chemistry of the end members precluded using other solutes (Na, K, and SO4) to test the mixing fractions derived from Rn-222 and Ca data; during those times of year when the soil temperature is most different from that of the underlying bedrock (late summer and late winter), temperature may be a useful tracer for distinguishing between water from the soil end members and that from bedrock. The mixing model provides a simple framework for analyzing the essential features of streamflow generation in this highly heterogeneous terrain. C1 OAK RIDGE NATL LAB,DIV ENVIRONM SCI,OAK RIDGE,TN 37831. MIT,DEPT CIVIL ENGN,CAMBRIDGE,MA 02139. RI Mulholland, Patrick/C-3142-2012 NR 34 TC 71 Z9 73 U1 3 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-1694 J9 J HYDROL JI J. Hydrol. PD FEB PY 1993 VL 142 IS 1-4 BP 167 EP 211 DI 10.1016/0022-1694(93)90010-7 PG 45 WC Engineering, Civil; Geosciences, Multidisciplinary; Water Resources SC Engineering; Geology; Water Resources GA KQ063 UT WOS:A1993KQ06300009 ER PT J AU CHAPATWALA, KD BABU, GRV WOLFRAM, JH AF CHAPATWALA, KD BABU, GRV WOLFRAM, JH TI SCREENING OF ENCAPSULATED MICROBIAL-CELLS FOR THE DEGRADATION OF INORGANIC CYANIDES SO JOURNAL OF INDUSTRIAL MICROBIOLOGY LA English DT Article DE BIODEGRADATION; IMMOBILIZED CELL; SODIUM CYANIDE; PSEUDOMONAS-PUTIDA; BIOBEAD ID BIODEGRADATION AB Different encapsulation matrices were screened to encapsulate cells of Pseudomonas putida for degradation of inorganic cyanides. Degradation of NaCN by free cells and cells immobilized in agar, alginate or carrageenan matrices was studied. The rate of NaCN degradation was monitored for 120 h by measuring pH, bacterial growth, dissolved and gaseous NH3 and gaseous CO2. Alginate-immobilized cells degraded NaCN more efficiently than free cells or agar- or carrageenan-immobilized cells. C1 EG&G IDAHO INC,INEL,IDAHO FALLS,ID 83401. RP CHAPATWALA, KD (reprint author), SELMA UNIV,DIV NAT SCI,SELMA,AL 36701, USA. NR 22 TC 11 Z9 12 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0169-4146 J9 J IND MICROBIOL JI J. Indust. Microbiol. PD FEB PY 1993 VL 11 IS 2 BP 69 EP 72 DI 10.1007/BF01583677 PG 4 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA KQ057 UT WOS:A1993KQ05700002 ER PT J AU FORTE, TM GOTHGOLDSTEIN, R NORDHAUSEN, RW MCCALL, MR AF FORTE, TM GOTHGOLDSTEIN, R NORDHAUSEN, RW MCCALL, MR TI APOLIPOPROTEIN A-I-CELL MEMBRANE INTERACTION - EXTRACELLULAR ASSEMBLY OF HETEROGENEOUS NASCENT HDL PARTICLES SO JOURNAL OF LIPID RESEARCH LA English DT Article DE CHINESE HAMSTER OVARY CELLS; NONDENATURING GRADIENT GEL ELECTROPHORESIS; ELECTRON MICROSCOPY; PHOSPHOLIPID ID HIGH-DENSITY-LIPOPROTEINS; SMOOTH-MUSCLE CELLS; HAMSTER OVARY CELLS; CHOLESTEROL EFFLUX; GOLGI FRACTIONS; SECRETION; BINDING; LIVER; METABOLISM; HEP-G2 AB The ability of lipid-free human apoA-I expressed by transfected Chinese hamster ovary (CHO) cells to form apoA-I-lipid complexes extracellularly when incubated with CHO cell monolayers was investigated. Lipid-free apoA-I was incubated with nontransfected CHO-C19 cells for 24 h and extracellular assembly products were isolated at d less-than-or-equal-to 1.235 g/ml; approximately 12% of the incubated apoA-I floated at d less-than-or-equal-to 1.235 g/ml when apoA-I was added at 10 mug/ml. The composition of the particles was 51.3% protein, 20.3% phospholipid, and 28.3% cholesterol. Electron microscopy of the apoA-I-lipid complexes revealed that discoidal particles 15.4 +/- 4.1 nm diameter predominated but some vesicular particles 34.7 +/- 16.8 nm diameter were also in evidence. Nondenaturing gradient gel electrophoresis of the extracellular assembly products formed after 24 h incubation with 10 mug/ml apoA-I showed particle size heterogeneity with major bands at 11.2 and 9.0 nm; additional minor components banded at 7.3, 17.7, and 19.5 nm. This size distribution, as well as composition and electron microscopic structure, is similar to that of complexes isolated from the medium of CHO cells transfected with the human apoA-I gene. The formation of extracellular assembly complexes was concentration-dependent such that at 2 mug apoA-I/ml for 24 h, primarily 7.3 nm complexes were formed; at 4 mug/ml the distribution was more heterogeneous and the major band peaked at 9.2 nm, while at 8 mug/ml the 7.3 nm component was greatly diminished and the 11.2 nm component was the major one. Formation of extracellular assembly products was sensitive to time of incubation when CHO-C19 cells were incubated with 8 mug/ml apoA-I for periods from 1 to 24 h. After 1 h incubation, only the 7.3 nm particle was present; at 4 h, in addition to the 7.3 nm component, a small band was noted at 9.0 nm. After 12 h incubation, the 7.3 and 9.0 nm components were pronounced but a distinct peak at 11.1 nm was also visible; at 24 hr the 11.0 and 9.0 components were dominant and the 7.3 nm particle was a minor component. We propose a precursor-product relationship in the formation of extracellular nascent apoA-I-containing particles where the first complexes are small, 7.3 nm, lipid-poor particles that eventually give rise to larger sized, lipid-enriched complexes. C1 LAWRENCE BERKELEY LAB,DEPT CELL & MOLEC BIOL,DIV LIFE SCI,BERKELEY,CA 94720. RP FORTE, TM (reprint author), LAWRENCE BERKELEY LAB,DEPT MOLEC & NUCL MED,1 CYCLOTRON RD,BERKELEY,CA 94720, USA. FU NCRR NIH HHS [RR 05918]; NHLBI NIH HHS [HL 18574] NR 34 TC 112 Z9 112 U1 0 U2 0 PU LIPID RESEARCH INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0022-2275 J9 J LIPID RES JI J. Lipid Res. PD FEB PY 1993 VL 34 IS 2 BP 317 EP 324 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA KL959 UT WOS:A1993KL95900015 PM 8429264 ER PT J AU LERNER, PB CHADWICK, MB SOKOLOV, IM AF LERNER, PB CHADWICK, MB SOKOLOV, IM TI INHOMOGENEOUS BROADENING OF ELECTRONIC-TRANSITIONS IN A LIQUID-HELIUM BUBBLE - THE ROLE OF SHAPE FLUCTUATIONS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID RYDBERG ATOM; SURFACE; INTERFACE; MIXTURES; HE-4 AB Recent experiments of Grimes et al. [Phys. Rev. B 41, 6366 (1990)] and Parshin et al. [JETP, 74, 68 (1992)] demonstrate a substatial broadening in the 1s-1p transition of a single electron trapped in a liquid helium bubble (''bubblonium'') compared to theoretical predictions based on natural radiative linewidth. We show that the larger observed linewidth can be explained by inhomogeneus broadening due to quantum quadrupole fluctuations in the bubble shape. A simple adiabaticity rule for the bubblonium transitions similar to the Franck-Condon principle for molecular transitions is established. Quantitative estimates of the additional inhomogeneous linewidth at T=0 and 2.2 K are provided The full theoretical linewidth, due to inhomogeneous and homogeneous broadening, has a Voigt-profile shape, and accounts for the data reasonably well. C1 UNIV FREIBURG,W-7800 FREIBURG,GERMANY. RP LERNER, PB (reprint author), LOS ALAMOS NATL LAB,DIV THEORET,LOS ALAMOS,NM 87545, USA. OI Lerner , Peter/0000-0002-3086-0170 NR 39 TC 19 Z9 19 U1 1 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 FEB PY 1993 VL 90 IS 3-4 BP 319 EP 330 DI 10.1007/BF00682005 PG 12 WC Physics, Applied; Physics, Condensed Matter SC Physics GA KV726 UT WOS:A1993KV72600009 ER PT J AU IZUMITANI, T PAYNE, SA AF IZUMITANI, T PAYNE, SA TI LUMINESCENCE OF SM-2+-DOPED FLUORIDE GLASSES SO JOURNAL OF LUMINESCENCE LA English DT Article ID EXCITED-STATE ABSORPTION; RARE-EARTH IONS; PHOTOIONIZATION; CRYSTALS; CAF2; DECAY; SM-2+; SRF2 AB We have investigated the optical properties of Sm2+-doped fluoride glasses having three different compositions. The absorption and emission spectra reveal that the immediate fluorine environment surrounding the Sm2+ ion is nearly identical for the three glass compositions, and is probably characterized by a high coordination number. The emission yield, on the other hand, is sensitively dependent on the composition of the glasses. It is theorized that the interaction of the host conduction band with the 4f(5)5d and 5D0 states is largely responsible for opening up a nonradiative decay pathway from the 5D0 emitting level, to the 7F ground state levels. As a consequence, the glasses based on heavy metal ions give smaller emission yields than those primarily based on smaller cations. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP IZUMITANI, T (reprint author), HOYA CORP,3-3-1 MUSASHINO,AKISHIMA SHI,TOKYO 196,JAPAN. NR 41 TC 34 Z9 34 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD FEB PY 1993 VL 54 IS 6 BP 337 EP 344 DI 10.1016/0022-2313(93)90002-5 PG 8 WC Optics SC Optics GA KV701 UT WOS:A1993KV70100002 ER PT J AU LIU, C BADER, SD AF LIU, C BADER, SD TI MAGNETISM AND GROWTH OF ULTRATHIN CO FILMS GROWN EPITAXIALLY ON RU(0001) SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID PERPENDICULAR SURFACE ANISOTROPY; KERR-EFFECT OBSERVATION; FE/RU SUPERLATTICES; MULTILAYERS; DOMAINS; CO/RU AB Low-energy electron diffraction and Auger spectroscopy have been used to determine that ultrathin films of Co grow pseudomorphically on Ru(0001) at room temperature in an island structure. Co thicknesses of 1-14 MLE (monolayer equivalents) were explored. The expanded Co lattice relaxes to its bulk spacing after a 500-degrees-C anneal. In-situ surface magneto-optic Kerr-effect measurements show ferromagnetic hysteresis loops with in-plane easy axes of magnetization for film thicknesses > 4 MLE. Thinner films are presumably affected by superparamagnetism. Annealing or Au coating the thicker films induces an out-of-plane easy axis of magnetization. RP LIU, C (reprint author), ARGONNE NATL LAB,DIV MAT SCI,BLDG 223,ARGONNE,IL 60439, USA. RI Bader, Samuel/A-2995-2013 NR 25 TC 14 Z9 14 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD FEB PY 1993 VL 119 IS 1-2 BP 81 EP 86 DI 10.1016/0304-8853(93)90506-W PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KM884 UT WOS:A1993KM88400013 ER PT J AU ZAK, J MOOG, ER LIU, C BADER, SD AF ZAK, J MOOG, ER LIU, C BADER, SD TI SINGLE LAYER EQUIVALENCE OF MAGNETOOPTIC MULTILAYERS FOR NORMAL INCIDENCE .1. AND SINGLE LAYER EQUIVALENCE OF MAGNETOOPTIC MULTILAYERS FOR OBLIQUE-INCIDENCE .2. - COMMENT SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID SUPERLATTICES C1 ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439. RP ZAK, J (reprint author), TECHNION ISRAEL INST TECHNOL,DEPT PHYS,IL-32000 HAIFA,ISRAEL. RI Bader, Samuel/A-2995-2013 NR 7 TC 0 Z9 0 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD FEB PY 1993 VL 119 IS 3 BP 365 EP 366 DI 10.1016/0304-8853(93)90422-X PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA KR708 UT WOS:A1993KR70800015 ER PT J AU YVON, PJ SCHWARZ, RB AF YVON, PJ SCHWARZ, RB TI EFFECTS OF IRON IMPURITIES IN MECHANICAL ALLOYING USING STEEL MEDIA SO JOURNAL OF MATERIALS RESEARCH LA English DT Note ID NI-ZR; POWDERS AB Mechanical alloying, a high-energy ball-milling technique, is now widely used for preparing alloy powders with metastable phases (crystalline or amorphous). The technique, however, may contaminate the powder with material eroded from the vial and milling media. We report on the analysis and effects of iron contamination on Al25Ge75 powders that we prepared by mechanically alloying mixtures of aluminum and germanium powders, using different mechanical alloying apparatuses. RP YVON, PJ (reprint author), LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545, USA. NR 9 TC 8 Z9 9 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 FEB PY 1993 VL 8 IS 2 BP 239 EP 241 DI 10.1557/JMR.1993.0239 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA KJ484 UT WOS:A1993KJ48400003 ER PT J AU LEE, EH LEE, Y OLIVER, WC MANSUR, LK AF LEE, EH LEE, Y OLIVER, WC MANSUR, LK TI HARDNESS MEASUREMENTS OF AR+-BEAM TREATED POLYIMIDE BY DEPTH-SENSING ULTRA-LOW LOAD INDENTATION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article AB Polyimide Kapton and spin-cast polyamic acid (PAA) on sapphire have been implanted with 1 MeV Ar ions to a dose of 4.7 x 10(15) cm-2 at ambient temperature. The properties of both pristine and implanted surfaces were characterized by a depth-sensing low-load indentation technique. Experiments were carried out to investigate the effects of substrate, indentation rate, relaxation, and indentation technique. The results showed that (1) hardness was depth-dependent and decreased with increasing indentation depth, (2) measurements of the ion beam hardened surface with the untreated material as a substrate underestimated the hardness while measurements over the sapphire substrate overestimated it, (3) the effects of loading/unloading rates were apparent in the load displacement results, and (4) hardness values measured using the force modulation technique showed very little depth dependence. The hardness value at 100 nm depth is used for comparison purposes since the hardness value at this depth was almost independent of substrate, indentation rate, and indentation method. The hardness of Kapton, which was measured using the techniques described herein, was increased by over 30 times after Ar implantation, from 0.43 to 13 GPa at 100 nm indentation depth. A similar increase in hardness was also observed for polyamic acid. This result suggests that spin-cast PAA film may have potential technological applications for protective coatings where hardness and wear resistance are required. RP LEE, EH (reprint author), OAK RIDGE NATL LAB,OAK RIDGE,TN 37831, USA. NR 14 TC 70 Z9 70 U1 2 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD FEB PY 1993 VL 8 IS 2 BP 377 EP 387 DI 10.1557/JMR.1993.0377 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA KJ484 UT WOS:A1993KJ48400026 ER PT J AU MAUPIN, HE RAWERS, JC AF MAUPIN, HE RAWERS, JC TI TIAL COMPOSITES FORMED FROM ELEMENTAL POWDERS BY HOT-ISOSTATIC PRESSING PROCESSING SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID HIGH-TEMPERATURE SYNTHESIS RP MAUPIN, HE (reprint author), US BUR MINES,ALBANY RES CTR,ALBANY,OR 97321, USA. NR 7 TC 1 Z9 1 U1 2 U2 4 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD FEB 1 PY 1993 VL 12 IS 3 BP 165 EP 167 DI 10.1007/BF00819947 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA KN485 UT WOS:A1993KN48500013 ER PT J AU BAADHIO, RA AF BAADHIO, RA TI VACUUM CONFIGURATION FOR INFLATIONARY SUPERSTRING SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article AB The vacuum configuration for the inflationary superstring theory is established. It is argued that the basic physical contents of the inflationary universe are characterized by the Novikov higher signature. Finally it is shown, with respect to the splitting in Paper II, that the index of the Dirac operator defined in our inflated universe, and in the parallel shadow one, is indeed h-cobordant. C1 UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP BAADHIO, RA (reprint author), LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 11 TC 0 Z9 0 U1 1 U2 1 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 FEB PY 1993 VL 34 IS 2 BP 345 EP 357 DI 10.1063/1.530250 PG 13 WC Physics, Mathematical SC Physics GA KK734 UT WOS:A1993KK73400001 ER PT J AU BAADHIO, RA AF BAADHIO, RA TI ON GLOBAL GRAVITATIONAL INSTANTONS IN SUPERSTRING THEORY SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID HETEROTIC STRING THEORY; TOPOLOGY AB The hypothesis is formulated that our universe and the parallel ''shadow'' one, as predicted by superstring theory, are connected by a ring of global gravitational instantons. This amounts to a favored conceptual model in which the universe would have split into two equal parts around the Planck scale. In the present formulation, the ten-dimensional space-time in which superstring theory is defined is inflated in two symmetrical directions, reaching a maximal full-fledged representation of E8' x E8. The radius of the inflationary universe is determined and arguments are made that strongly restrict the number of interactions between our universe and the parallel one. This yields an explanation as to why the other entity is shadow to ours. C1 MATH SCI RES INST,BERKELEY,CA 94720. UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720. RP BAADHIO, RA (reprint author), LAWRENCE BERKELEY LAB,DIV PHYS,THEORET PHYS GRP,BERKELEY,CA 94720, USA. NR 22 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 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD FEB PY 1993 VL 34 IS 2 BP 358 EP 368 DI 10.1063/1.530251 PG 11 WC Physics, Mathematical SC Physics GA KK734 UT WOS:A1993KK73400002 ER PT J AU ZYWICZ, E KINNEY, JH SATTLER, ML BREUNIG, TM NICHOLS, MC AF ZYWICZ, E KINNEY, JH SATTLER, ML BREUNIG, TM NICHOLS, MC TI HETEROGENEOUS FIBER MICROSTRUCTURES AND THEIR INFLUENCE ON FAILURE SO JOURNAL OF MICROSCOPY-OXFORD LA English DT Article DE X-RAY TOMOGRAPHIC MICROSCOPY; METAL-MATRIX COMPOSITE; SILICON CARBIDE FIBER; MICROSTRUCTURE; FRACTURE; FAILURE AB A detailed microscopic, experimental and micromechanical evaluation of fibre damage initiation in a unidirectional aluminium matrix-silicon carbide fibre (SCS-8TM) composite has been performed for a monotonic load sequence. The salient fibre features include a 33-mum-diameter monofilament turbostratic carbon (C) core, a approximately 1.5-mum pyrolytic C layer, an interior sheath of beta-phase silicon carbide (SiC) crystallites imbedded in an amorphous C matrix, and an exterior sheath of radially orientated beta-SiC. Quantitative microscopy shows that the interior sheath's surplus C varies smoothly from approximately 35% by volume near the core to zero at the mid-radius. The multi-phase structure of the fibre produces an internal mechanical stiffness that increases with distance from the core, and thus peak stresses result in the exterior sheath. X-ray tomographic microscopy (XTM) reveals that cores fracture randomly, without failure of the surrounding SiC, at stress levels above half the ultimate strength of the composite. Three-dimensional XTM reconstructions show planar, non-planar and spiral cracks in the failed fibre, suggesting multiple and competing initiation mechanisms. Qualitative fracture assessments suggest that flaws near the C core grow outward in a curved manner through the SiC-C and planar beyond the mid-radius, whereas cracks originating near the fibre-matrix interface favour planar trajectories inward across the whole fibre. C1 SANDIA NATL LABS,LIVERMORE,CA 94550. RP ZYWICZ, E (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 11 Z9 11 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0022-2720 J9 J MICROSC-OXFORD JI J. Microsc.-Oxf. PD FEB PY 1993 VL 169 BP 247 EP 253 PN 2 PG 7 WC Microscopy SC Microscopy GA KR180 UT WOS:A1993KR18000017 ER EF